JP7182575B2 - Asphalt odor control agent, asphalt composition and method for producing asphalt composition - Google Patents

Description

The present invention relates to an asphalt odor inhibitor that suppresses the odor generated when asphalt is heated, an asphalt composition containing the asphalt odor inhibitor, and a method for producing the asphalt composition.

Asphalt mixtures are generally used for road paving in the field of construction and civil engineering. The asphalt mixture is produced by heating and mixing asphalt or modified asphalt (hereinafter sometimes referred to as an asphalt composition), aggregate such as gravel, and filler such as stone powder in a plant or the like.

When asphalt is heated to a high temperature, the hydrocarbons and sulfur-based components contained in the asphalt are oxidized and deteriorated, generating offensive odor components such as carboxylic acids and aldehydes. In particular, when modified asphalt is used, the odor becomes even stronger due to the addition of offensive odor components due to the deterioration of the rubber and thermoplastic elastomer contained in the modified asphalt.

Therefore, plants that handle asphalt compositions need to take measures against the odor. In particular, when the asphalt composition is transported between plants, it is difficult to suppress the odor generated when the asphalt composition is loaded into and unloaded from a tank truck. In addition, modified asphalt is used as a waterproofing material in the waterproof layer between the foot of a road bridge and the pavement. Remarkable.

Several proposals have been made in the past to control odors from asphalt. For example, Patent Literature 1 describes a method of masking odors by mixing a liquid fragrance additive containing perfume or the like with asphalt to suppress those odors. Further, Patent Document 2 describes a deodorant composition for asphalt comprising a fragrance that has a boiling point of 200° C. or higher at normal pressure and is stable even at high temperatures, and a fragrance-retaining base material such as silica gel.

Japanese Patent Application Laid-Open No. 2003-342908 JP 2007-137922 A

However, the liquid fragrance additive described in Patent Document 1 is highly volatile, and when added to asphalt heated to, for example, 200° C. or higher, the fragrance component volatilizes in a short time and the deodorizing or masking effect is maintained. likely not. This is also the case when the asphalt is heated after adding the fragrance additive.

In addition, the deodorant composition for asphalt described in Patent Document 2 uses a fragrance having a boiling point of 200° C. or higher at normal pressure, so that the deodorant or masking effect is maintained even at high temperatures, but the volatility is poor and the asphalt deodorant composition has poor volatility. It may not be possible to sufficiently deodorize or mask the odor. In addition, the deodorant composition for asphalt described in Patent Document 2 has a limit to the amount of perfume that can be retained in the retaining base material, so it is necessary to use a large amount of the retaining base material. There are concerns about handling difficulties and increases in manufacturing costs and operating costs due to this.

In view of the above, an object of the present invention is to provide an asphalt odor inhibitor capable of achieving both a deodorant or masking effect and durability, an asphalt composition containing the same, and a method for producing an asphalt composition.

A brief outline of typical inventions disclosed in the present application is as follows.
[1] An asphalt odor inhibitor containing a perfume compound having a boiling point of less than 200°C at normal pressure and a solvent having a boiling point of 200°C or more at normal pressure.
[2] The asphalt odor inhibitor according to [1], wherein the boiling point of the fragrance compound at normal pressure is 150°C or higher and lower than 190°C.
[3] The asphalt odor inhibitor according to [1] or [2], wherein the asphalt odor inhibitor contains 25% by mass or more and 90% by weight or less of the fragrant compound, and the asphalt odor inhibitor contains the solvent 10% by mass or more and 75% by mass or less of asphalt odor inhibitor.
[4] A first fragrance compound having a boiling point of 50° C. or more and less than 150° C. at normal pressure, a second fragrance compound having a boiling point of 150° C. or more and less than 200° C. at normal pressure, and a solvent having a boiling point of 200° C. or more at normal pressure. An asphalt odor control agent comprising:
[5] A fragrance compound having a boiling point of less than 200°C at normal pressure, a first solvent having a boiling point of from 200°C to less than 300°C at normal pressure, and a second solvent having a boiling point of from 300°C to less than 400°C at normal pressure, An asphalt odor control agent containing
[6] An asphalt composition containing the asphalt odor inhibitor according to any one of [1] to [5].
[7] A method for producing an asphalt composition, comprising adding the asphalt odor inhibitor according to any one of [1] to [5] to asphalt or modified asphalt.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an asphalt odor inhibitor capable of achieving both a deodorant or masking effect and durability, an asphalt composition containing the same, and a method for producing an asphalt composition.

An embodiment of the present invention will be described in detail below. As used herein, "to" means a range including the lower and upper limits. The term "deodorizing or masking effect" includes either one of the deodorizing effect or the masking effect, or the case of exhibiting both the deodorizing effect and the masking effect.

(Asphalt odor inhibitor)
<Overview of the asphalt odor inhibitor according to the first embodiment>
Hereinafter, the asphalt odor inhibitor according to the first embodiment of the present invention (hereinafter sometimes referred to as the odor inhibitor of the first embodiment) will be described in detail. The odor suppressant of the first embodiment contains a perfume compound having a boiling point of less than 200°C under normal pressure and a solvent having a boiling point of 200°C or higher under normal pressure. Here, "normal pressure" means pressure equal to atmospheric pressure (1013.25 hPa).

As described above, in order to suppress the odor of the asphalt composition, for example, if only a fragrance compound with a boiling point of less than 200 ° C. at normal pressure is used as an odor suppressant, it is added to the asphalt composition heated to 200 ° C. or higher. (or when added to the asphalt composition and heated to 200 ° C. or higher), the amount of evaporation of the fragrance compound per unit time is large, so the deodorant or masking effect is exhibited, but the deodorant or masking effect does not last long. On the other hand, when only a fragrance compound having a boiling point of 200°C or higher under normal pressure is used as an odor control agent, the amount of evaporation of the fragrance compound per unit time is small, so the deodorant or masking effect lasts for a long time, but sufficient elimination is not achieved. No odor or masking effect is obtained.

In this respect, the odor suppressant of the first embodiment contains a perfume compound having a boiling point of less than 200°C under normal pressure and a solvent having a boiling point of 200°C or higher under normal pressure. By doing so, the fragrance compound can be dispersed in the solvent, the vapor pressure of the fragrance compound can be appropriately lowered, and the amount of evaporation of the fragrance compound per unit time can be controlled. As a result, the odor suppressant of the first embodiment can sufficiently deodorize or mask the odor of asphalt used at a high temperature of 200° C. or higher, and can maintain the deodorizing or masking effect.

In addition, since the odor suppressant of the first embodiment is a liquid in which a perfume compound is dispersed in a solvent, it is easy to handle as an odor suppressant. Costs and the like can be reduced.

In the odor inhibitor of the first embodiment, the boiling point of the fragrance compound at normal pressure is not particularly limited as long as it is less than 200°C, preferably 50°C or more and less than 200°C, and 110°C or more and less than 190°C. is more preferable, and 150° C. or more and less than 190° C. is even more preferable.

In general, asphalt begins to flow at 110 ° C. or higher (e.g., temperature during asphalt transportation), and 150 ° C. or higher and lower than 190 ° C. (e.g., during asphalt transportation, modified asphalt production or asphalt construction temperature), it has sufficient fluidity and odor generation occurs. In addition, asphalt becomes almost liquid at 200° C. or higher, and odor generation becomes significant (for example, the construction temperature when used as a waterproofing material is 200 to 280° C.). On the other hand, asphalt loses its fluidity when it is less than 110°C and odor is less likely to occur, and when it is less than 50°C, it is almost solidified and no odor is generated (for example, the temperature after cooling has progressed after construction).

Therefore, in the odor suppressant of the first embodiment, by setting the boiling point of the fragrance compound at normal pressure to 50 ° C. or higher and lower than 200 ° C. (more preferably 110 ° C. or higher and lower than 190 ° C.), odors such as when asphalt is transported In the temperature range in which such deodorization is likely to occur, the fragrance compound is easily evaporated, and the deodorant or masking effect can be exerted. Furthermore, by setting the boiling point of the fragrance compound at normal pressure to 150 ° C. or more and less than 190 ° C., the fragrance compound can be reliably evaporated in the temperature range where odors are particularly likely to occur, such as during the production of modified asphalt and during asphalt construction. It is possible to sufficiently exhibit the deodorant or masking effect.

Similarly, in the odor suppressant of the first embodiment, the boiling point of the solvent at normal pressure is not particularly limited as long as it is 200° C. or higher. Taking this into account, the temperature is preferably 200°C or higher and lower than 400°C.

In the odor suppressant of the first embodiment, the contents of the perfume compound and the solvent in the odor suppressant are not particularly limited because the above-mentioned effects can be achieved at arbitrary contents. It is preferable that the compound is contained in an amount of 25% by mass or more and 90% by mass or less, and the solvent is contained in an amount of 10% by mass or more and 75% by mass or less in the odor suppressant. By containing 25% by mass or more of the fragrance compound in the odor inhibitor (75% by mass or less of the solvent in the odor inhibitor), the amount of evaporation of the fragrance compound per unit time becomes a certain amount or more, thereby deodorizing or masking. The effect can be exhibited sufficiently. On the other hand, by containing 10% by mass or more of the solvent in the odor suppressant (90% by mass or less of the fragrance compound in the odor suppressant), it is possible to control the amount of evaporation of the fragrance compound per unit time. The masking effect can be sufficiently sustained.

The odor inhibitor of the first embodiment may contain one or more fragrance compounds having a boiling point of less than 200°C at normal pressure. It may contain essential oils and the like. Similarly, one or more solvents having a boiling point of 200° C. or higher under normal pressure may be contained. In addition, the odor suppressant of the first embodiment may contain other additives such as other perfume ingredients and/or other solvents as long as it does not deviate from the gist of the present invention. The same applies to the embodiment and the third embodiment).

<Outline of perfume compound according to the first embodiment>
Examples of the perfume compound according to the first embodiment include, but are not limited to, the following.

Examples of perfume compounds with a boiling point of less than 200°C at normal pressure: cis-3-hexenol (boiling point 156.5°C), cis-3-hexenyl acetate (boiling point 75.0°C), ethyl 2-methylbutyrate (boiling point 135°C .1 ° C.), isoamyl acetate (boiling point 142.1 ° C.), eucalyptol (1,8-cioneal) (boiling point 174.0 ° C.), linalool (boiling point 198.5 ° C.), ethyl butyrate (boiling point 122.4 ° C. ), octanal (boiling point 163.4°C), ethyl acetate (boiling point 73.9°C), prenyl acetate (3-methyl-2-butenyl acetate) (boiling point 149.7°C), butyl acetate (boiling point 126.6°C) , terpinyl acetate (boiling point 95.0 ° C.), 2-methylbutyl acetate (boiling point 135.1 ° C.), methyl acetate (boiling point 44.0 ° C.), isobutyl acetate (boiling point 116.6 ° C.), limonene (boiling point 175.4 ° C. ), γ-terpinene (boiling point 182.0° C.), α-pinene (boiling point 157.9° C.), β-pinene (boiling point 166.0° C.), myrcene (boiling point 167.0° C.), p-cymene (boiling point 176 0° C.), camphene (boiling point 158.6° C.), hexanal (boiling point 127.9° C.), benzaldehyde (boiling point 178.7° C.), acetaldehyde (boiling point 21.0° C.), trans-2-hexenal (boiling point 146.0° C.). 0°C), melonal (boiling point 187.7°C), isovaleraldehyde (boiling point 93.5°C), hexanol (boiling point 156.0°C), acetaldehyde diethyl acetal (boiling point 103.6°C), acetaldehyde propylene glycol acetal (boiling point 98.6° C.), ethyl propionate (boiling point 99.0° C.), allyl caproate (boiling point 186.0° C.), ethyl 2-methylvalerate (boiling point 153.0° C.), ethyl caproate (boiling point 167.9° C.) ° C.), isoamyl butyrate (boiling point 176.5° C.), isoamyl isovalerate (boiling point 194.0° C.), rose oxide (boiling point 196.7° C.), p-cresyl methyl ether (4-methoxytoluene) (boiling point 174 .0°C), 2-phenylethyl methyl ether (boiling point 172.3°C).

Examples of essential oils containing fragrance compounds with a boiling point of less than 200°C at normal pressure: Brazilian orange (sweet orange) (boiling point 177°C), lime terpene (lime distillate) (boiling point 182°C), grapefruit essential oil (boiling point 171°C). , lemon essential oil (terpene-less oil) (boiling point 176°C).

<Overview of Solvent According to First Embodiment>
Examples of the solvent according to the first embodiment include the following, but are not limited to these. In addition, the solvent itself may be one that can be used as a perfume compound.

Examples of solvents with a boiling point of 200° C. or higher at normal pressure: dipropylene glycol (boiling point 230.5° C.), diethyl phthalate (boiling point 294° C.), triethyl citrate (boiling point 294° C.), high boiling isoparaffin (boiling point 277-353 ° C.), tripropylene glycol (boiling point 316.1° C.), triacetin (boiling point 258° C.), benzyl benzoate (boiling point 324.1° C.), methyl dihydrojasmonate (boiling point 307.8° C.), galaxolide (registered trademark) ( 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[g]-2-benzopyran, boiling point 326.3° C.), iso-E super (registered Trademark) (1-(2,
3,8,8-tetramethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-2-yl)ethan-1-one, boiling point 312.2°C).

<Overview of Asphalt Odor Inhibitor According to Second Embodiment>
Hereinafter, the asphalt odor inhibitor according to the second embodiment of the present invention (hereinafter sometimes referred to as the odor inhibitor of the second embodiment) will be described in detail. The odor inhibitor of the second embodiment comprises a first fragrance compound having a boiling point of 50° C. or more and less than 150° C. at normal pressure, a second fragrance compound having a boiling point of 150° C. or more and less than 200° C. at normal pressure, and a boiling point at normal pressure contains a solvent having a temperature of 200° C. or higher.

The odor inhibitor of the second embodiment contains a perfume compound having a boiling point of less than 200°C at normal pressure and a solvent having a boiling point of 200°C or higher at normal pressure, like the odor inhibitor of the first embodiment. Therefore, the odor of asphalt used at a high temperature of 200° C. or higher can be sufficiently deodorized or masked, and the deodorant or masking effect can be maintained.

In particular, in the odor suppressant of the second embodiment, the fragrance compounds include a first fragrance compound having a boiling point of 50°C or more and less than 150°C at normal pressure and a second fragrance compound having a boiling point of 150°C or more and less than 200°C at normal pressure. 2 fragrance compounds. By doing this, different types of fragrance compounds evaporate depending on the temperature range from the time of manufacturing the modified asphalt to the time of asphalt transportation and the time of asphalt construction, so the deodorant or masking effect can be achieved in a wide temperature range. can be demonstrated. More specifically, the second fragrance compound having a boiling point of 150° C. or more and less than 200° C. at normal pressure exerts a deodorizing or masking effect in a temperature range where asphalt has high fluidity, and a boiling point of 50° C. or more at normal pressure. The first perfume compound below 150°C provides a deodorizing or masking effect during loading and unloading of the asphalt and in the temperature range until the asphalt cools and solidifies.

In the odor inhibitor of the second embodiment, the boiling point of the first fragrance compound at normal pressure is more preferably 110°C or higher and lower than 150°C, and the boiling point of the second fragrance compound at normal pressure is 150°C or higher and 190°C. It is more preferably less than. By doing so, as described above, the deodorant or masking effect can be exhibited more reliably in the temperature range where odor is likely to occur.

In the odor inhibitor of the second embodiment, the contents of the first fragrance compound, the second fragrance compound and the solvent in the odor inhibitor are not particularly limited. It is preferable that each of the two perfume compounds is contained in an amount of 10% by mass or more, and the total content is 20% by mass or more and 75% by mass or less, and the solvent is contained in an amount of 25% by mass or more and 80% by mass or less in the odor control agent. By containing 10% by mass or more of each of the first fragrance compound and the second fragrance compound in the odor suppressant (80% by mass or less of the solvent in the odor suppressant), the amount of evaporation of the fragrance compound per unit time is reduced. It becomes more than a certain level, and the deodorizing or masking effect can be fully exhibited. On the other hand, by containing 25% by mass or more of the solvent in the odor inhibitor (the total of the first fragrance compound and the second fragrance compound in the odor inhibitor is 75% by mass or less), the per unit time of the fragrance compound The amount of evaporation can be controlled, and the deodorant or masking effect can be sufficiently maintained.

The odor inhibitor of the second embodiment may contain one or two or more first fragrance compounds having a boiling point of 50° C. or more and less than 150° C. at normal pressure. It may contain one or two or more second fragrance compounds having a temperature of 150° C. or more and less than 200° C., and one or two or more solvents having a boiling point of 200° C. or more at normal pressure.

Examples of the first fragrance compound and the second fragrance compound according to the second embodiment include the first
Among the perfume compounds exemplified according to the embodiments, those that meet the boiling point conditions of the first perfume compound and the second perfume compound can be mentioned. Also, the solvent according to the second embodiment is the same as the solvent according to the first embodiment, so the description thereof is omitted.

<Overview of Asphalt Odor Inhibitor According to Third Embodiment>
Hereinafter, the asphalt odor inhibitor according to the third embodiment of the present invention (hereinafter sometimes referred to as the odor inhibitor of the third embodiment) will be described in detail. The odor inhibitor of the third embodiment comprises a perfume compound having a boiling point of less than 200°C at normal pressure, a first solvent having a boiling point of from 200°C to less than 300°C at normal pressure, and a boiling point of from 300°C to 400°C at normal pressure. and a second solvent.

Similar to the odor inhibitors of the first and second embodiments, the odor inhibitor of the third embodiment comprises a perfume compound having a boiling point of less than 200°C at normal pressure and a fragrance compound having a boiling point of 200°C or more at normal pressure. , the odor of asphalt used at a high temperature of 200° C. or higher can be sufficiently deodorized or masked, and the deodorant or masking effect can be maintained.

In particular, in the odor suppressant of the third embodiment, the solvents include a first solvent having a boiling point of 200° C. or more and less than 300° C. at normal pressure and a second solvent having a boiling point of 300° C. or more and less than 400° C. at normal pressure. and By containing at least two kinds of solvents with different boiling points in this way, it is possible to control the evaporation of the fragrance compound according to the respective temperature ranges from the production of the modified asphalt to the transportation of the asphalt to the construction of the asphalt. can. Further, for example, when using asphalt as a waterproof material, it is necessary to maintain the asphalt at 200 to 300° C. for a long time during construction. In this regard, in the odor suppressant of the third embodiment, not only the first solvent having a boiling point of 200° C. or more and less than 300° C. at normal pressure but also the second solvent having a boiling point of 300° C. or more and less than 400° C. at normal pressure Also, even if the asphalt is maintained at a high temperature of 200 to 300 ° C. for a long time, it is possible to prevent the situation that the solvent evaporates and the deodorizing or masking effect cannot be maintained.

In the odor control agent of the third embodiment, the contents of the perfume compound, the first solvent and the second solvent in the odor control agent are not particularly limited, but the content of the perfume compound in the odor control agent is 25% by mass or more. It is preferable that the content is 75 mass % or less, and the first solvent and the second solvent are each 12.5 mass % or more in the odor suppressant, and the total content is 25 mass % or more and 75 mass % or less. By containing 25% by mass or more of the fragrance compound in the odor inhibitor (the total amount of the first solvent and the second solvent in the odor inhibitor is 75% by mass or less), the amount of evaporation of the fragrance compound per unit time is reduced. It becomes more than a certain level, and the deodorizing or masking effect can be fully exhibited. On the other hand, by containing 12.5% by mass or more of the first solvent and the second solvent in the odor inhibitor (75% by mass or less of the fragrance compound in the odor inhibitor), the amount of the fragrance compound per unit time The amount of evaporation can be controlled, and the deodorant or masking effect can be sufficiently maintained.

The odor inhibitor of the third embodiment may contain one or more fragrance compounds having a boiling point of less than 200°C at normal pressure. less than 1 type or 2 types or more, and may contain 1 type or 2 types or more of the 2nd solvent whose boiling point is 300 degreeC or more and less than 400 degreeC in normal pressure.

As examples of the first solvent and the second solvent according to the third embodiment, among the solvents exemplified as the solvents according to the first embodiment described above, those that satisfy the respective boiling point conditions of the first solvent and the second solvent. are mentioned. Moreover, since the perfume compound according to the third embodiment is the same as the perfume compound according to the first embodiment, the description thereof is omitted.

By combining the second embodiment and the third embodiment, a first fragrance compound having a boiling point of 50 ° C. or more and less than 150 ° C. at normal pressure and a second fragrance compound having a boiling point of 150 ° C. or more and less than 200 ° C. at normal pressure and a first solvent having a boiling point of 200° C. or more and less than 300° C. at normal pressure, and a second solvent having a boiling point of 300° C. or more and less than 400° C. at normal pressure. Such an odor inhibitor exhibits both the effect of the odor inhibitor of the second embodiment and the effect of the odor inhibitor of the third embodiment.

(Asphalt composition)
<Overview of asphalt composition>
Hereinafter, an asphalt composition according to one embodiment of the present invention (hereinafter sometimes referred to as the present asphalt composition) will be described in detail.

The asphalt composition comprises asphalt or modified asphalt and one or more of the odor control agents of any one of the first to third embodiments described above. That is, the present asphalt composition contains asphalt or modified asphalt, a perfume compound having a boiling point of less than 200°C under normal pressure, and a solvent having a boiling point of 200°C or more under normal pressure.

Therefore, when the asphalt composition of the present invention is used at a high temperature of 200° C. or higher, it can be used in a state where the odor of asphalt is sufficiently deodorized or masked for a long period of time. .

The asphalt that constitutes the present asphalt composition includes saturated chain hydrocarbons (paraffin), saturated cyclic hydrocarbons (naphthene), aromatic hydrocarbons, condensed polycyclic aromatic hydrocarbons (resin), and condensed polycyclic aromatic hydrocarbons. It is a general one consisting of a mixture such as a layered structure of hydrogen (asphaltene). Asphalt includes types such as straight asphalt, blown asphalt, and semi-blown asphalt depending on the processing method, but is not particularly limited.

In addition, the modified asphalt that constitutes the present asphalt composition is obtained by adding rubber, thermoplastic elastomer, etc. to the above-mentioned asphalt to improve properties such as the mechanical strength of the asphalt. Examples of rubbers and thermoplastic elastomers added to modified asphalt include styrene-butadiene rubber (SBR) and styrene-butadiene-styrene block copolymer (SBS).

(Method for producing asphalt composition)
<Outline of method for producing asphalt composition>
Hereinafter, a method for producing an asphalt composition according to one embodiment of the present invention (hereinafter sometimes referred to as a method for producing an asphalt composition) will be described in detail.

In the method for producing the present asphalt composition, one or more of the odor inhibitors of any one of the above first to third embodiments (hereinafter sometimes referred to as "the present odor inhibitor") is added to asphalt or modified asphalt. adding. That is, the method for producing the present asphalt composition includes (1) adding the present odor inhibitor to asphalt to produce the asphalt composition, and (2) adding rubber and/or thermoplastic elastomer to asphalt. When the modified asphalt is produced and then the odor inhibitor is added to produce an asphalt composition, (3) after the odor inhibitor is added to the asphalt, the rubber and/or thermoplastic elastomer are added. , when manufacturing an asphalt composition, and (4) adding a rubber and/or thermoplastic elastomer and the present odor control agent to asphalt (during the same process) to manufacture an asphalt composition. be The place where the present odor suppressant is added is not particularly limited. For example, it may be added at an asphalt or modified asphalt manufacturing plant, or at an asphalt composition construction site.

According to the method for producing the present asphalt composition, the present odor inhibitor containing a perfume compound having a boiling point of less than 200°C under normal pressure and a solvent having a boiling point of 200°C or more under normal pressure is added to asphalt or modified asphalt. Since the step of adding is included, it is possible to deodorize or mask the odor generated during the manufacturing process of the asphalt composition. Furthermore, in the asphalt composition produced by the production method of the present asphalt composition, when used at a high temperature of 200 ° C. or higher, the odor of asphalt is sufficiently deodorized for a long time. Can be used while masked.

<Application example 1 of method for producing asphalt composition>
Application Example 1 (road pavement) of the method for producing the present asphalt composition will be described in detail below. First, while heating asphalt to 150-250° C., styrene-butadiene rubber or the like is added and stirred for 3-5 hours to prepare modified asphalt. After that, the odor suppressant is added to the modified asphalt produced and loaded into a tank truck. The modified asphalt is kept at 150-200°C in tank trucks and transported to the mixing plant over a period of 6-24 hours. The modified asphalt is then extruded from the tank truck into a mixing plant. Then, in a mixing plant, the modified asphalt is heated to 150-200° C. and then mixed with aggregate (gravel) and filler (stone flour) within about 1 minute to produce an asphalt mixture. In the asphalt mixture, 3-5% is modified asphalt and the remaining 95-97% is aggregate and filler. Before mixing modified asphalt with aggregate and filler, it may be stored in a molten state (160-180° C.) within several days. The produced asphalt mixture is loaded onto a dump truck and transported to the construction site within about an hour at 120-185°C. After that, the asphalt mixture transported to the construction site is cooled and solidified to less than 110° C. within about 30 minutes after being leveled and compacted.

In the above application example 1, conventionally, when asphalt was loaded into a tank truck, an odor derived from the asphalt was generated in the surrounding area. It can be deodorized or masked. Also, when the asphalt is pushed out from the tank truck to the mixing plant, an odor derived from the asphalt is generated in the surrounding area, but the odor can be similarly deodorized or masked. Furthermore, it can be expected that the effect of deodorizing or masking the odor of asphalt in the vicinity of the construction site will continue until the asphalt mixture is constructed and cooled.

<Application example 2 of method for producing asphalt composition>
Application Example 2 (waterproof material) of the method for producing the present asphalt composition will be described in detail below. First, while heating asphalt to 150 to 250° C., styrene-butadiene rubber or the like is added and stirred for 3 to 5 hours to produce modified asphalt in the same manner as in Application Example 1 described above. The odor control agent is then added and loaded into a tank truck. After that, the modified asphalt is transported to the road bridge deck construction site over a period of 6 to 24 hours while being kept at 180 to 220°C in a tank truck. The modified asphalt is then extruded from the tank truck into an open kettle. In the open pot, the modified asphalt is heated to 200-280° C. and held for about 2 hours, after which the modified asphalt is applied as a waterproofing material and cooled to solidify.

In the above application example 2, as in the above-described application example 1, the present odor suppressant can deodorize or mask odors during loading and unloading of asphalt, and can also be used for road bridge deck slabs. It is possible to effectively deodorize or mask the odor generated by being heated at a high temperature for a long time at the construction site.

<Application example 3 of method for producing asphalt composition>
Application Example 3 (waterproofing material) of the method for producing the present asphalt composition will be described in detail below. First, while heating asphalt to 150 to 250° C., styrene-butadiene rubber or the like is added and stirred for 3 to 5 hours to produce modified asphalt in the same manner as in Application Example 1 described above. In the process of cooling and solidifying it, it is molded into blocks or sheets, and packed in cardboard boxes. The molded product is transported to the road bridge deck construction site, heated in an open kettle and melted. At that time, the present odor inhibitor is added, and the modified asphalt is heated to 200 to 280° C. in an open kettle and held for about 2 hours.

In the above application example 3, similarly to the application example 2 described above, the odor generated by long-term high-temperature heating at the road bridge deck construction site is effectively deodorized or masked. be able to.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the present invention is not limited to the following examples.

[Example 1] Evaluation of Sustainability 10 g of straight asphalt was placed in a glass container, heated to 180 ° C., and 10 μL of the odor inhibitor of Example 1-1 prepared according to the formulation shown in Table 1 was added to prepare a sample. . As the perfume compound of Example 1-1, (A1) cis-3-hexenol (boiling point 156.5 ° C.) having a boiling point of less than 200 ° C. at normal pressure, and as the solvent of Example 1-1, (B1) dipropylene glycol having a boiling point of 200° C. or higher (boiling point of 230.5° C.) was used.

Regarding the sample kept at 180° C. even after the addition of the odor inhibitor in Example 1-1, six well-trained panelists evaluated the results "immediately", "10 minutes", and "30 minutes" after the addition of the odor inhibitor. And "60 minutes later", the odor was smelled, and the deodorant or masking effect was evaluated. According to the consensus of the six panelists, "◎" indicates that the asphalt odor was hardly felt, "○" indicates that the asphalt odor was not noticeable, and "△" indicates that the asphalt odor was bothersome. , and those with a strong asphalt odor were evaluated as "x", respectively, and the results are shown in Table 1.

As shown in Table 1, according to Example 1-1, the odor inhibitor containing a perfume compound having a boiling point of less than 200° C. at normal pressure and a solvent having a boiling point of 200° C. or more at normal pressure has an asphalt odor. sufficiently deodorizing or masking, and the deodorizing or masking effect lasts.

[Example 2] Example containing one or more fragrance compounds 10 g of straight asphalt was placed in a glass container and then heated to 200 ° C., and the mixture of Examples 2-1 to 2-5 prepared according to the formulation shown in Table 2 Samples were prepared to which 10 μL of odor control agent was added to each. Perfume compounds of Examples 2-1 to 2-4 include (A1) cis-3-hexenyl (boiling point 156.5°C) having a boiling point of less than 200°C at normal pressure, and (A2) cis-3-hexenyl acetate. (boiling point 75.0° C.), (A3) ethyl 2-methylbutyrate (boiling point 135.1° C.), (A4) rose oxide (boiling point 196.7° C.), and as perfume compounds of Examples 2-5, these used all. As the solvent in Examples 2-1 to 2-5, (B1) dipropylene glycol was used in the same manner as in Example 1-1.

About the samples kept at 200° C. even after the addition of the odor inhibitors of Examples 2-1 to 2-5, six well-trained panelists measured the odor "immediately" and "10 minutes after" the addition of the odor inhibitors. was smelled and the deodorant or masking effect was evaluated. The odors "immediately after" and "10 minutes later" were given as "2" when the panelists felt almost no asphalt odor, "1" when they felt a slight asphalt odor, and "0" when they felt a strong asphalt odor. were scored respectively. The scoring results are averaged by 6 panelists, and those that are 1.5 or more in both "immediately" and "10 minutes later" are marked as "◎", and those that are 1.0 or more are marked as "○". , was evaluated as "Δ" when it was 0.5 or more, and as "X" when it was less than 0.5. Table 2 shows the evaluation results of Examples 2-1 to 2-5.

As shown in Table 2, according to Example 2, if the boiling point of the fragrance compound constituting the odor suppressant at normal pressure is less than 200°C, the same procedure as in Example 1 is performed regardless of the type of the fragrance compound. , it was shown that the effect of deodorizing or masking the odor of asphalt can be sufficiently obtained. As Example 2-5, an example in which all of the fragrance compounds (A1) to (A4) were used was shown, but the present inventors used any of (A1) to (A4) as the fragrance compound (A). It was confirmed that the deodorant or masking effect of the asphalt odor can be obtained even when two or three types are combined. In particular, (A) as the fragrance compound, (A2) or (A3) having a boiling point at normal pressure of 50 ° C. or more and less than 150 ° C., and (A1) or (A4) having a boiling point at normal pressure of 150 ° C. or more and less than 200 ° C. It is preferable to combine (A3) with a boiling point of 110 ° C. or more and less than 150 ° C. at normal pressure and (A1) with a boiling point of 150 ° C. or more and less than 190 ° C. at normal pressure. .

[Example 3] Example in which the ratio of the perfume compound and the solvent was changed Examples 3-1 to 3-5 prepared according to the formulation shown in Table 3 by placing 10 g of straight asphalt in a glass container and heating to 200 ° C. were added with 10 μL of each of the odor inhibitors. The perfume compound and solvent in Examples 3-1 to 3-5 are the same as in Examples 1-1 and 2-1, but in Examples 3-1 to 3-5, as shown in Table 3, respectively, The ratio of perfume compound to solvent is varied. The evaluation method of Examples 3-1 to 3-5 is the same as the evaluation method of Example 2. Table 3 shows the evaluation results of Examples 3-1 to 3-5.

As shown in Table 3, according to Example 3, when the odor suppressant contains 10% by mass or more and 90% by mass or less of the fragrant compound and 10% by mass or more and 90% by mass or less of the solvent, the asphalt It was shown that a sufficient deodorant or masking effect for the odor of In particular, according to Examples 3-2 to 3-5, when the odor suppressant contains 25% by mass or more and 90% by mass or less of the perfume compound and 10% by mass or more and 75% by mass or less of the solvent, It was shown that the deodorant or masking effect of asphalt odor is excellent. In addition, although not shown in Table 3, the present inventors have found that the odor suppressant contains 5% by mass or more and 95% by mass or less of a perfume compound and 5% by mass or more and 95% or less of a solvent. It has been confirmed that at least a deodorant or masking effect can be obtained.

[Example 4] Example containing one or more solvents 10 g of straight asphalt was placed in a glass container and heated to 200 ° C., and the odors of Examples 4-1 to 4-5 prepared according to the formulation shown in Table 4 Samples were prepared to which 10 μL of inhibitor was added respectively. Examples of the solvents used in Examples 4-1 to 4-4 include (B1) dipropylene glycol (boiling point 230.5°C) and (B2) benzyl benzoate (boiling point 324.1°C), each having a boiling point of 200°C or higher at normal pressure. ), (B3) galaxolide (boiling point 326.3° C.), and (B4) diethyl phthalate (boiling point 294.0° C.) were all used as solvents in Examples 4-5. As the fragrance compound in Examples 4-1 to 4-5, (A1) cis-3-hexenol was used in the same manner as in Example 1-1. The evaluation method of Examples 4-1 to 4-5 is the same as the evaluation method of Example 2. Table 4 shows the evaluation results of Examples 4-1 to 4-5.

As shown in Table 4, according to Example 4, if the boiling point of the solvent constituting the odor suppressant at normal pressure is 200 ° C. or higher, the asphalt It was shown that a sufficient deodorant or masking effect for the odor of In addition, although an example using all the solvents (B1) to (B4) was shown as Example 4-5, the present inventors used any two of (B1) to (B4) as the (B) solvent. It was confirmed that the deodorant or masking effect of asphalt odor can be obtained even when one type or a combination of three types is used. In particular, as the solvent (B), (B1) or (B4) having a boiling point at normal pressure of 200° C. or more and less than 300° C. and (B2) or (B3) having a boiling point at normal pressure of 300° C. or more and less than 400° C. I liked the combination.

[Comparative example]
As a comparison object for Examples 1 to 4, 10 g of straight asphalt was placed in a glass container and heated to 200 ° C., and 10 μL of the odor inhibitor of Comparative Examples 1-1 to 1-3 prepared according to the formulation shown in Table 5 was added. A spiked sample was prepared. Comparative Examples 1-4 are samples in which 10 g of straight asphalt is placed in a glass container and then heated to 200° C. and no odor control agent is added.

As the solvent in Comparative Examples 1-1 and 1-3, (B91) propylene glycol (boiling point 188.2°C) having a boiling point of less than 200°C at normal pressure was used as the solvent in Comparative Examples 1-2 and 1-3. As the fragrance compound, (A91) 2-hexylcinnamaldehyde (boiling point 308.0°C) having a boiling point of 200°C or higher at normal pressure was used. The evaluation method for Comparative Examples 1-1 to 1-4 is the same as the evaluation method for Example 2. Table 5 shows the evaluation results of Comparative Examples 1-1 to 1-4.

As shown in Table 5, the odor inhibitors of Comparative Examples 1-1 to 1-3 are more effective in suppressing the odor of asphalt than the sample to which no odor inhibitor was added in Comparative Example 1-4. Although the masking effect was exhibited to some extent, it was shown that the deodorant or masking effect was not sufficient as compared with Examples 1 to 4.

The reason for this is considered below. In Comparative Example 1-1, the solvent had a boiling point of less than 200° C. under normal pressure, so the fragrant compound volatilized together with the solvent in a short period of time, and the deodorizing or masking effect did not last. In Comparative Example 1-2, since the boiling point of the perfume compound at normal pressure is 200° C. or higher, the volatility of the perfume compound is poor, and a sufficient deodorant or masking effect could not be obtained. In Comparative Example 1-3, the boiling point of the perfume compound at normal pressure is 200° C. or higher, and the boiling point of the solvent at normal pressure is less than 200° C., and only the solvent evaporates. This is probably because it was not obtained.

[Summary of Examples]
From the above examples, it was confirmed that the odor inhibitor of the present invention satisfactorily deodorizes or masks the odor of asphalt, and that the deodorant or masking effect is sustained.

Claims (7)

An asphalt odor inhibitor containing a perfume compound having a boiling point of less than 200°C at normal pressure and a solvent having a boiling point of 200°C or more at normal pressure (excluding those that can be used as a perfume compound) ,
An asphalt odor inhibitor containing 10% by mass or more of the solvent in the asphalt odor inhibitor . The asphalt odor suppressant of claim 1,
The asphalt odor inhibitor, wherein the aromatic compound has a boiling point at normal pressure of 150°C or higher and lower than 190°C. In the asphalt odor inhibitor according to claim 1 or 2,
Containing 25% by mass or more and 90% by mass or less of the fragrance compound in the asphalt odor inhibitor,
An asphalt odor inhibitor containing 10% by mass or more and 75% by mass or less of the solvent in the asphalt odor inhibitor. A first fragrance compound having a boiling point of 50 ° C. or more and less than 150 ° C. at normal pressure, a second fragrance compound having a boiling point of 150 ° C. or more and less than 200 ° C. at normal pressure, and a solvent having a boiling point of 200 ° C. or more at normal pressure (as a fragrance compound asphalt odor control agent containing
An asphalt odor inhibitor containing 25% by mass or more of the solvent in the asphalt odor inhibitor . A fragrance compound having a boiling point of less than 200°C at normal pressure, a first solvent having a boiling point of 200°C or more and less than 300°C at normal pressure (excluding those that can be used as a fragrance compound) , and a boiling point of 300°C or more and 400°C at normal pressure. a second solvent (other than one usable as a perfume compound) at a temperature below °C , and
An asphalt odor inhibitor containing 12.5 mass % or more of each of the first solvent and the second solvent in the asphalt odor inhibitor . An asphalt composition comprising the asphalt odor control agent according to any one of claims 1-5. adding the asphalt odor inhibitor according to any one of claims 1 to 5 to asphalt or modified asphalt;
A method for producing an asphalt composition, comprising: