JP3339970B2 - Additive for high-viscosity asphalt for drainable pavement, high-viscosity asphalt pavement composition for drainage pavement using the same, and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a so-called drainage water comprising a specific acidic organic phosphoric acid compound and having a water permeability of 10 ^-2 cm / sec or more as described in Asphalt Pavement Guidelines (published by The Japan Road Association). TECHNICAL FIELD The present invention relates to a bituminous additive used for a pavement composition body having a water-permeable or water-permeable function, an asphalt pavement composition using the same, and a method for producing the same. And strengthen
As a result, the present invention relates to an additive for bituminous material capable of exhibiting an extremely excellent exfoliation preventing effect on bituminous material, an asphalt pavement composition using the same, and a method for producing the same.

[0002]

2. Description of the Related Art A drainage pavement or a water-permeable pavement is a pavement method in which asphalt mixture having a large void is used in the surface layer of the pavement, and rainwater remaining on the surface is stored in the pavement and allowed to flow down. It is.

[0003] The function of drainage pavement is to prevent the hydroplaning phenomenon in rainy weather, smoke, light reflection,
It is directly linked to improvements in traffic safety, environmental measures, and service levels, such as a reduction in splashing and a reduction in rolling noise caused by tire running. Expectations for development and introduction are high.

[0004] By the way, bituminous material is non-polar and thus does not sufficiently adhere to aggregates. Potentially, bituminous materials have a defect that they are peeled off from aggregates by the action of water such as precipitation or groundwater. Conventionally, when used for pavement, attention is paid to the porosity as small as possible so that water does not permeate.

[0005] However, in the drainage pavement or the water-permeable pavement method, voids are actively used, and the adhesion between the aggregate and bituminous material tends to be further reduced.

[0006] Generally, asphalt for drainage pavement that is commercially available is called a high-viscosity binder, and is designed so that a thermoplastic resin or rubber is mixed into the asphalt so that a fluidization phenomenon does not easily occur. I have. As a result, the adhesiveness of the interface between the asphalt and the aggregate is reduced, and peeling is more likely to occur.

[0007] As described above, the technical problem of improving the adhesion between bituminous material and aggregate is a very important problem for improving the performance of asphalt pavement, and various methods have been devised for solving the problem. For example, according to Japanese Patent Publication No. 55-38993, higher aliphatic polyamines and derivatives thereof are used as a countermeasure, but higher aliphatic polyamines and derivatives thereof conventionally devised have improved initial adhesion improving performance. However, the durability of the effect of preventing peeling is said to be about one year.

Japanese Patent Application Laid-Open No. 57-51745 also proposes a method for improving the adhesion performance by adding a silane compound, but it is harmful when added to heated bituminous material and during the production of heated mixture. It has a serious odor and steam generation, leaving safety and health problems, and is economically and practically ineffective.

Further, a composition obtained by adding and mixing a phosphate compound such as phosphorus pentoxide, polyphosphoric acid and phosphorus pentasulfide to asphalt is used as an asphalt modifying additive in Japanese Patent Publication No. Sho 54-2.
Although disclosed and proposed in Japanese Patent No. 3691, these phosphate compounds are inorganic substances, and their dispersion state in organic substances is not always good, and the adhesion performance of asphalt to aggregates is insufficient.

Japanese Patent Application Laid-Open No. 60-188462 discloses that an acidic organic phosphoric acid compound has an effect of preventing peeling. However, at present, the required level of peeling prevention for asphalt mixtures having a large porosity is increasing. However, the performance is not sufficient to satisfy these requirements, and the development of an additive having further anti-peeling performance is desired.

[0011]

Means for Solving the Problems The present inventors have proposed a permeability coefficient described in the asphalt pavement outline (published by the Japan Road Association).
Having more than 10 ^-2 cm / sec, as a result of diligent efforts to develop an excellent anti-peeling effect on a pavement composition having a so-called drainage or water-permeability function, a particular acidic organic phosphoric acid compound is particularly excellent. The present inventors have found that they have the ability to exhibit a peeling preventing effect, and have completed the present invention.

That is, the present invention provides a straight-chain or
Branched saturated or unsaturatedMonoaliphatic phosphate ester
(A) and saturated or unsaturated of a straight or branched chain having 16 to 18 carbon atoms
Sum ofDialiphatic phosphate ester(B)
(A + B) × 100 (mol%) is 40-95
To be, Permeability coefficient 10 ^-2 cm / sec or moreDrainage or water permeability machine
Used for pavement with functionHigh viscosity ass for drainage pavement
FaltRelated to additives.

[0013] The present invention also relates to an asphalt composition comprising 3 to 10 parts by weight of a high viscosity asphalt for drainage pavement , wherein 0.05 to 5 parts by weight of the additive according to claim 1 or 2 is added to 100 parts by weight.
Parts by weight and 97 to 90 parts by weight of aggregate composed of crushed stone, sand and filler , having a water permeability of 10 ^-2 cm / sec or less
The present invention relates to an asphalt pavement composition having the above drainage or water permeability function.

Further, the present invention provides the above-mentioned drainage method, which comprises kneading an asphalt mixture in which the above-mentioned additive is added to a high-viscosity asphalt for drainage pavement and an aggregate.
The present invention relates to a method for producing a high-viscosity asphalt pavement composition for conductive pavement .

The additive of the present invention may be a single acidic organic phosphoric acid compound or a mixture of a plurality of acidic organic phosphoric acid compounds.

The conventionally devised higher aliphatic polyamines and derivatives thereof are adsorbed and oriented to the positive or negative polarity of the polar group,
Improves wetting between bituminous material and aggregate. Although effective for initial adhesion, it has problems with long-term adhesion. For example, when external stress such as temperature rise and dynamic load is applied in the presence of water for a long period of time, the additive itself is a surfactant and acts as a bituminous emulsifier to peel bitumen from aggregate. There is a disadvantage.

The present invention has a composition to arrange molecules most densely at the interface between bituminous material and aggregate, and furthermore, forms a chemical bond at the interface by a dehydration reaction as shown in the following reaction formula, and makes it stronger. Adhesion and polymerization of the acidic organic phosphoric acid compound itself form a strong hydrophobic coating on the surface of the aggregate, so even if water enters the surface of the aggregate, it will not be replaced with bituminous material and will not impact. It is considered that the composition exhibits an excellent delamination preventing effect in which the adhesive interface between the aggregate and the bituminous material is not destroyed even when subjected.

[0018]

Embedded image

In order to form an optimal adhesive interface dense in molecular structure and arrangement, a linear or branched saturated or unsaturated mono- or mono-phosphate mono-aliphatic ester having 16 to 18 carbon atoms (A) and 16-18 linear or branched saturated or unsaturated diphosphates
Becomes because the aliphatic ester (B), A / (A + B) × 10
It is important that 0 (mol%) is a composition ratio of 40 to 95, and even if the phosphate monoaliphatic ester ratio is less than 40 or more than 95, such a dense molecular arrangement and chemical bond are obtained. Is difficult, and the peeling prevention performance is insufficient. More preferably, A / (A + B) × 100 (mol%) is 60 to 90.

The values of A and B used herein can be obtained by the following method for analyzing an acidic organic phosphoric acid compound (for example, the method described in JP-B-58-8746). That is, 1 g of the product was subjected to potentiometric titration with an alkali by an ordinary method, and the required amount of alkali (amg) by the first equivalent point and the required amount of alkali (bmg) by the second equivalent point were determined. After the addition of silver nitrate having a chemical equivalent or more than the phosphate acidic OH group present in the above, a potentiometric titration with an alkali is performed in the same manner to obtain an alkali amount (cmg) required up to the third equivalent point. Calculate the content.

[0021]

(Equation 1)

In the present invention, the acidic organic phosphoric acid compound is
Examples of the phosphorylating agent include, but are not limited to, phosphorus pentoxide (P ₂ O ₅ ), phosphorus oxytrichloride (P
OCl _3), phosphorus trichloride (PCl _3), such as using a polyphosphoric acid and as alcohol starting material, an alcohol, saturated or unsaturated straight-chain or branched-chain having 16 to 18 carbon atoms is used, for example, cetyl alcohol , Stearyl alcohol, oleyl alcohol, Guerbet alcohol and the like. An acidic organic phosphoric acid compound having a predetermined ester composition ratio can be obtained depending on the kind of the phosphorylating agent used, the molar ratio of the alcohol to the phosphorylating agent, and the addition of water.

The acidic organic phosphoric acid compound of the present invention may be an alcohol having a different number of carbon atoms from the viewpoint of the raw material for synthesis (for example, Kao Corporation)
(Calcol series) may be mixed, but it is desirable to use it as an alcohol raw material containing alcohol of 16 to 18 carbon atoms in an amount of 70% by weight or more. However, there is no problem in performance, and it is included in the scope of the present invention.

The additive of the present invention is used in an amount of from 0.05 to 0.05 asphalt used for pavement having drainage or water permeability.
It is 5.0% by weight, preferably 0.1 to 3.0% by weight. 0.05
If the content is less than 5.0% by weight, the effect is reduced. If the content is more than 5.0% by weight, the effect is obtained but it is not economical.

The crushed stone, sand and filler used in the asphalt pavement composition having a drainage property or a water-permeability function of the present invention are irrespective of the material and the like as long as they conform to the asphalt pavement guidelines (edited by The Japan Road Association). And the present invention. The mixing ratio of the aggregate composed of crushed stone, sand and filler is preferably 3 to 10 parts by weight of the asphalt composition to which the additive of the present invention is added, and 97 to 90 parts by weight of the aggregate.

The asphalt pavement composition having a drainage or water-permeability function of the present invention is prepared by adding the additive of the present invention to asphalt previously heated to a temperature in the range of 120 to 220 ° C. and thoroughly mixing the asphalt mixture with crushed stone, sand, And a filler are kneaded. In manufacturing the asphalt pavement composition having a drainage or water permeability function of the present invention, the additive of the present invention is uniformly dispersed in asphalt by adding the additive of the present invention to preheated asphalt, and An asphalt pavement composition having an excellent drainage or water permeability function can be obtained. If the additive of the present invention is previously mixed with crushed stone, sand, filler, or the like, the additive is localized and a homogeneous asphalt pavement composition cannot be obtained.

In order to better achieve the object of the present invention, various aliphatic amines may be used in combination with the acidic organic phosphoric acid compound in the present invention. This means that the initial wetting is further enhanced by having a nitrogen atom in the molecule. The amines are not particularly limited, but generally include higher aliphatic polyamines and derivatives thereof such as tallow propylene diamine, and alkylolamines such as alkylhydroxyamine, monoethanolamine, diethanolamine, and triethanolamine. Is preferably used on the neutral or acidic side. Various aliphatic amines used in combination with the acidic organic phosphoric acid compound of the present invention are not limited to these.

[0028] In the present invention, as bituminous adding an acidic organic phosphoric acid compound, high viscosity asphalt drainage pavement
used.

[0029]

EXAMPLES Hereinafter, the present invention will be described specifically, but the present invention is not limited to these examples. Note that “%” in the following examples is “% by weight”.

In order to confirm the effect of the present invention, a water immersion marshalling test was performed. The water immersion marshalling test conformed to the Japan Road Corporation's test method KODAN202 “Marshalling test method for asphalt mixture”. However, the water immersion temperature of the specimen was increased from 60 ° C. to 80 ° C., and the water immersion time of the specimen was increased from 48 hours to 96 hours, and the test was performed under more severe conditions.

The test was conducted by the Marshall Stability Test Method (ASTM D
1559-65, Asphalt Pavement Guidelines, Appendix 4.10). The type of asphalt mixture used in this test is shown in Asphalt Mixture for Drainable Pavement (Asphalt Pavement Outline (published by The Japan Road Association)), and the materials shown in Table 1 were used. Asphalt pavement composition test specimens for the test were prepared by melting asphalt by heating to 180 to 220 ° C, adding the additives of the present invention according to the conditions to prepare an asphalt mixture, and then heating to 180 to 220 ° C. It was produced by kneading with the material. Mixing conditions are as follows: mixing temperature 180-220 ° C, compacting temperature 180-200 ° C
I went in. Ten test specimens (cylindrical shape with a diameter of 10 cm and a thickness of about 6.3 cm) were prepared, five of them were subjected to a standard marshall test, and the remaining five were immersed in a constant temperature water bath at 80 ° C for 96 hours. , And the Marshall stability of the specimen was determined. The residual stability by the water immersion marshall test was calculated from the following equation.

[0032]

(Equation 2)

[0033]

[Table 1]

Examples 1 to 10 and Comparative Examples 1 to 8 Various additives shown in Table 2 were mixed to prepare sample asphalt. Table 2 shows the results of the water immersion marshalling test.

Reference Example 1 A comparison was made between the asphalt mixture for drainable pavement and the ordinary dense-grained asphalt mixture (13) (asphalt pavement outline, published by The Japan Road Association). The same materials as in Table 1 were used, and the mixing ratio was changed so as to obtain a dense particle asphalt mixture (13) described in the asphalt pavement outline. Table 2 shows the results of the water immersion marshalling test. The water permeability of the mixture was 0.7 × 10 ⁻² cm / sec.

Reference Example 2 The procedure of Reference Example 1 was repeated except that the additives shown in Table 2 were mixed in the sample asphalt. Table 2 shows the results of the water immersion marshalling test.
It was shown to. The water permeability of the mixture was 0.7 × 10 ⁻² cm / sec.

[0037]

[Table 2]

[0038]

As shown in Reference Example 1, the blending of the fine-grained asphalt mixture (13) does not require any measures for preventing peeling.
As shown in Comparative Example 1, when the asphalt mixture for drainage pavement was used, the porosity increased, and as a result, the permeability of water into the mixture increased, and the adhesion between the asphalt and the aggregate decreased. , The residual stability is significantly reduced. From the examples, asphalt mixture for drainage pavement using the bituminous additive for pavement having drainage or water permeability function of the present invention, adhesion of asphalt and aggregate even when water enters the mixture Due to the improved rate, the residual stability was high. From the above, it is apparent that the use of the additive of the present invention significantly improved the peel prevention effect and improved the durability. This additive enables the development of new pavement technology having drainage or water permeability and improves the durability of asphalt pavement. The ripple effect is great.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C08L 95/00 C08K 5/00-5/59

Claims (4)

(57) [Claims] A linear or branched saturated or unsaturated mono-aliphatic phosphoric acid monoester (A) having 16 to 18 carbon atoms and a carbon atom having 16 carbon atoms.
~ 18 linear or branched saturated or unsaturated diphosphate phosphates
Becomes because the family ester (B), A / (A + B) × 100
Characterized in that (mol%) is 40 to 95, permeability
Pavement with drainage or water permeability of 10 ^-2 cm / sec or more
Additive for high-viscosity asphalt for drainage pavement used for water. 2. The phosphoric ester of cetyl alcohol or stearyl alcohol.
The additive for high-viscosity asphalt for drainage pavement according to the above. 3. An asphalt composition in which 0.05 to 5 parts by weight of the additive according to claim 1 or 2 is added to 100 parts by weight of high-viscosity asphalt for drainage pavement , crushed stone, sand and filler. A high-viscosity asphalt pavement composition for drainage pavement having a water permeability of 10 ⁻² cm / sec or more and having a water- permeability or water-permeability , comprising 97 to 90 parts by weight of an aggregate made of: 4. The drainage pavement according to claim 3, wherein an asphalt mixture obtained by adding the additive according to claim 1 or 2 and the aggregate are kneaded in advance to the high viscosity asphalt for drainage pavement. A method for producing a high-viscosity asphalt pavement composition.