JP2948622B2 - Back coating agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a seat cover in a vehicle interior, a door lining, a ceiling material,
The present invention relates to a back coating agent that can stably impart a function of removing a bad smell in a vehicle compartment to a skin material for a long period of time by being applied to the back surface of a fabric used for a floor carpet or the like.

[Conventional technology]

In recent years, as the performance of passenger cars, such as driving performance, safety, and comfort, has become more complete, interest in odors in the cabin, which has a large effect on comfort during riding, has increased, and odors in the atmosphere of the cabin have been reduced. More effective countermeasures have been required for reduction. The bad smell here is, for example, a smell such as a cigarette smell, a sweat smell, a musty smell, an exhaust gas smell, a solvent smell or a plasticizer smell generated from a resin interior material or an adhesive.

Sheet materials to which a hydrous magnesium silicate clay mineral is added are known as effective deodorizing agents capable of removing these malodors (JP-A-62-282926 and JP-A-62-282927). It has an excellent deodorizing effect due to the adsorption properties of minerals.

However, when these are used as a vehicle skin material, static electricity accumulated in the human body due to friction between the seat skin and clothes when the vehicle is on board discharges when touching a door or the like when getting off, causing a discomfort to the body. Occurs.

As a skin material that can solve the two problems of odor and static electricity, activated carbon is added to the back coating layer to improve the bonding strength between the yarns constituting the fabric, and this is applied to the conductive fabric. A vehicle skin material to be used is conceivable.

Activated carbon contained in the back coating layer removes offensive odor, and the conductive material contained in the fabric, and the conductive material added to the back coating agent, such as carbon black, metal powder, and conductive fiber The powder can prevent the accumulation of static electricity.

As described above, the vehicular skin material is a practically extremely useful deodorizing material having both the function of suppressing the generation of static electricity accumulated in the human body and the function of removing the bad odor in the vehicle interior.

However, the back coating agent used when producing this skin material has a variation in pot life, and if it is short, solid content may settle out within two to three weeks, making it unusable, resulting in reduced productivity. Problems such as cost and cost increase.

For example, a method for producing an activated carbon holding substrate (Japanese Patent Publication No. 55-1143)
In 43), sedimentation of activated carbon particles occurred in a relatively short period of time because no appropriate dispersant was used.

Further, when applying using a doctor roll or a doctor blade, solids may remain on the roll or blade, making application impossible.In this case, maintenance and maintenance of production equipment is required, and the A similar problem occurred.

[Object of the invention]

Thus, an object of the present invention is to effectively produce a skin material having a function of effectively removing a bad smell in a vehicle compartment and suppressing the generation of static electricity accumulated in a human body when riding in a vehicle for a long period of time. It is to provide a back coating agent.

[Configuration of the invention]

The present inventors have conducted intensive studies to solve the above conventional problems, and the pot life of the back coating agent is determined by the sedimentation rate of coarse activated carbon particles and whether or not an appropriate dispersant is used. As a result, the present invention has been completed.

That is, the back coating agent of the present invention generally contains 5 parts of activated carbon per 100 parts by weight of the solid content of the polymer latex.
It is obtained by adding and mixing 0 to 180 parts by weight and 3 to 20 parts by weight of a dispersant. If the amount of activated carbon is less than 50 parts by weight, sufficient deodorizing performance cannot be expected, and if it exceeds 180 parts by weight,
Insufficient polymer latex, resulting in insufficient properties of the back coating agent, namely, improved dimensional accuracy of fabric, prevention of yarn fraying and opening, improved fabric strength, flame retardant retention, etc. Because it becomes. When the amount of the dispersant is less than 3 parts by weight, the stability of the back coating agent becomes insufficient, and when it exceeds 20 parts by weight, the water resistance and weather resistance of the back coating agent deteriorate.

The particle size of the activated carbon is preferably 100 μm or less. If it is 100 μm or more, the particles are too large, causing sedimentation in the back coating agent in a relatively short period of time, and shortening the life of the back coating agent.

[Function of the invention]

 The operation of the present invention is considered as follows.

Activated carbon having a particle diameter of 100 μm or less contained as a main component of the back coating agent has a specific surface area of 1000 m ² / g or more and mainly has pores of about 10 nm. For this reason, it is considered that it functions as a site for accepting sulfide-based odors such as hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide, and hydrocarbon-based odors such as toluene and styrene, and exhibits deodorization. .

The dispersant has an effect of stably dispersing the activated carbon in the polymer latex. In particular, when using a high molecular weight surfactant comprising a synthetic polymer or a cellulose derivative having a molecular weight of 10,000 or more, since the size of the molecule is large,
Since it does not penetrate into the pores of the activated carbon, it does not occupy the adsorption site acting on the odorous component and does not vaporize.
Further, it is chemically stable and has little interaction with odorous substances.

The polymer latex itself has almost no deodorizing property, but forms a porous film without covering the activated carbon when a back coating agent is applied to a fabric and dried. Therefore, according to the configuration of the present invention, the deodorizing performance of the activated carbon is not hindered.

 The static electricity removing function is considered as follows.

The static electricity generated by the friction between the clothing and the skin material for the vehicle is charged on the surface of the skin material and the clothing when the normal skin material is used, and the human body is charged by the static electricity charged on the clothing.

When the back coating agent of the present invention is applied to a fabric with conductivity, static electricity generated by friction between clothes and a vehicle skin material is collected by the conductive fibers contained in the skin material. Further, the collected static electricity is diffused throughout the skin material by the activated carbon in the back coating agent, the generation of local high voltage is suppressed, and the static electricity is gradually discharged into the air. Therefore, no high-voltage static electricity is generated in the human body due to electrostatic induction. In this way, static electricity is effectively removed, and an unpleasant discharge phenomenon when the vehicle gets off the vehicle is prevented.

On the other hand, the reason why the back coating agent of the present invention is stable for a long period of time is based on the improved properties of the activated carbon in the structure of the back coating agent.

Among the substances dispersed in water, the dispersant is dissolved. The polymer latex is stably dispersed as colloid particles. However, if the activated carbon particles are too large, they will gradually settle and determine the pot life. The sedimentation velocity increases as the particle size increases.

The activated carbon used for the back coating agent of the present invention has a particle diameter of 100 μm or less, so the weight per particle is very small, and the specific surface area is very large, so that the sedimentation velocity due to the molecular motion of water is reduced. It becomes considerably slow. As a result, the back coating agent of the present invention can have a pot life of 3 months or more.

〔The invention's effect〕

Activated carbon contained in the back coating agent of the present invention has a large specific surface area and has a large number of pores, so that the surface material using the back coating agent of the present invention has an ability to remove a complex odor. I do.

In addition, since the activated carbon contained in the back coating agent of the present invention has electric conductivity, by combining this with a conductive cloth, it is possible to simultaneously impart a deodorizing function and a static electricity removing function to the skin material. It is.

Furthermore, the particle size of this activated carbon is 100 μm or less,
The pot life of the back coating agent can be extended to 3 months or more. In addition, as the particle diameter decreases, the specific skin area increases, and it is possible to improve the deodorizing performance of the skin material using the back coating agent of the present invention against malodor such as sulfide odor.

[Other inventions]

The polymer latex used in the present invention is a main element of the back coating agent, and by combining the fibers constituting the fabric with the fibers, improves the dimensional accuracy of the fabric, prevents the fibers from fraying, and A substance that functions as a binder that holds additives such as activated carbon and a flame retardant and fixes the fabric.

Polymer latex includes synthetic resin latex and rubber latex, of which synthetic resin latex is composed of resin colloid particles as a dispersoid and water or the like as a dispersing medium. It effectively acts as a binder by fusing. To be more specific, synthetic resin latex includes polyvinyl chloride latex, polyvinylidene chloride latex, polyurethane latex, polyacrylate latex, polyvinyl acetate latex, polyacrylonitrile latex and their modified products, copolymers, etc. No. As rubber latex, specifically,
Natural rubber, styrene butadiene rubber, acrylonitrile rubber, acrylonitrile butadiene rubber, isoprene isobutylene rubber, polyisobutylene, polybutadiene,
Examples thereof include polyisoprene, polychloroprene, and polyethylene propylene.

A hydrous magnesium silicate clay mineral may be added to the back coating agent of the present invention as a deodorant. The addition amount is 1 to 100 parts by weight of the solid content of the polymer latex, out of a total of 50 to 180 parts by weight of the clay mineral and the activated carbon.
The range is 0 to 90% by weight. At this time, the dispersing agent is
0 parts by weight are added. The sum of the amounts of clay mineral and activated carbon added is 50
If the amount is less than 180 parts by weight, sufficient deodorizing performance cannot be expected. Prevention, improvement of fabric strength, retention of flame retardant, etc. are insufficient.

The content of the clay mineral is preferably in the range of 10 to 90% by weight of the total amount of the clay mineral and the activated carbon. If the content is less than 10% by weight or exceeds 90% by weight,
The deodorizing performance is impaired because the smaller one of the two does not exhibit sufficient adsorption characteristics.

The hydrous magnesium silicate clay mineral (hereinafter referred to as clay mineral) is a clay mineral having hydrous magnesium silicate as a main component and having a highly reactive hydroxyl group on its surface. This clay mineral is composed of fibers having a diameter of about 0.05 to 0.6 μm, and has pores (channels) having a rectangular cross section of about 1 to 0.6 nm in parallel with the fibers. It has the property of adsorbing bad smell and water vapor. In addition, in the clay mineral, magnesium or silicon may be partially replaced by aluminum, iron, nickel, sodium, or the like. Specific examples include sepiolite, white tile, laphrinite, falconite, and palygorskite. Also known as mountain cork,
These include mountain leather, mountain wood, sepiolite, and attapulgite. This is 400
What was calcined in the temperature range of ℃ to 800 ℃ may be used.
The clay mineral may be used in any form of powder, granule, or plate.However, it is preferable that the clay mineral is pulverized to the extent that pores of the clay mineral remain. Is preferably an aggregate of microcrystals of 100 or less. The pulverization at this time is performed by wet pulverization or dry pulverization using a mixer, a ball mill, a vibration mill, a hammer mill, a pin mill, a beater or the like.

The particle diameter of these clay minerals is equal to or less than the size of the thickness of the fabric in a state of being attached to the fabric, specifically, it may be about 3 mm or less, but if it is too large, it deteriorates the texture as the fabric. If it is not preferable, if it is too small, the clay mineral will be buried in the polymer latex and the deodorizing property will be reduced. Specifically, it is desirable that the particle size is in the range of 1 to 200 μm.

It is more preferable that the activated carbon of the present invention has a particle diameter of 50 μm or less, because the life of the back coating agent is further extended to 6 months or more, and the deodorizing performance is further improved.

The activated carbon used in the present invention is amorphous carbon in crystal structure. In its structure, graphite's basic crystallites are arranged irregularly, and countless pores formed after the crystallites have been gaps and partially disappeared crystallites when activated by gas or chemicals. Existing.

The pores are classified into three types: macropores, transitional pores, and micropores. Macropores have a radius of 20 ~
It is larger than 1000 Angstroms and its volume is
0.2~0.5ml / g, the surface area is 0.5~2m ² / g. The transitional pore has a radius of 20 to 1000 angstroms, a volume of 0.02 to 1.0 ml / g, and a surface area of 1 to 800 m ² / g. Micropores intended follows radius 20 Å, volume 0.25~0.9ml / g, a surface area of 500~1400m ² / g.

Since most of the odor gas molecules in the atmosphere can enter the micropores, the micropores contribute most to the adsorption capacity. The transitional pore has a great influence on the diffusion rate of the adsorbate in the pore, and in a region where the relative pressure of the adsorbate is high, the gas is captured by capillary condensation.
Macropores have little effect on gas adsorption. These pore structures vary depending on the raw materials and activation conditions.

As the raw material of the activated carbon, any substance which is carbonized by heating is applicable, but there are sawdust, charcoal, coconut shell, lignite, peat, coal, pulp waste liquid, etc. as raw materials which can be stably supplied in large quantities at low cost. The activation method includes a chemical activation method and a gas activation method. As the chemicals used in the chemical activation method, chemicals having a dehydrating action and an erosive action on raw materials, specifically, zinc chloride, phosphoric acid, sulfuric acid, calcium chloride, sodium hydroxide, etc., and oxidizing chemicals, Specifically, potassium dichromate, potassium permanganate and the like are used. In the gas activation method, first, a raw material is carbonized, and then the raw material is activated by contact with a gas at a high temperature. As the gas to be brought into contact, steam,
Carbon dioxide gas, air, and a mixed gas thereof are used. Any of the activated carbons thus obtained can be suitably used in the present invention, but those in which micropores have been developed are particularly effective.Specifically, coconut shells are used as raw materials,
Those activated by the gas activation method are most suitable.

The clay mineral and the activated carbon contained in the back coating agent of the present invention cause a difference in the adsorbed substance due to the difference in specific surface area and pore size, and these effects are combined, and the skin using the back coating agent of the present invention is used. Gives the material the ability to remove complex odors.

As the dispersant used for stably dispersing the activated carbon or clay mineral in the polymer latex in the present invention, a polymer surfactant having a molecular weight of 10,000 or more is suitably used. Low-molecular surfactants penetrate the pores of clay minerals or activated carbon to reduce the deodorizing function, low-molecular surfactants themselves vaporize and become odor sources, or exist in the atmosphere It is not desirable because it may generate a bad smell due to a chemical reaction with the substance. Polymeric surfactants used as dispersants include synthetic polymers and cellulose derivatives, and examples of synthetic polymers include polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone, and styrene-maleic acid copolymer. Can be Examples of the cellulose derivative include methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and the like.

In addition, other additives, for example, a flame retardant may be added to the back coating agent of the present invention as long as the properties are not impaired. Common flame retardants include phosphorus compounds, chlorine compounds, bromine compounds, guanidine nitrogen compounds,
There are antimony compounds, boron compounds, ammonium compounds and the like, specific examples of which are monoammonium phosphate,
Secondary ammonium phosphate, phosphoric acid triester, phosphite, phosphonium salt, phosphoric acid triamide,
Chlorinated paraffin, dechlorane, ammonium bromide, tetrabromobisphenol A, tetrabromoethane, guanidine hydrochloride, guanidine carbonate, guanylurea phosphate,
Examples include antimony oxide, sodium tetraborate decahydrate (borax), ammonium sulfate, and ammonium sulfamate.

The back coating agent of the present invention is applied to the back surface of the fabric and then dried to form a resin. The coating amount, in the range of 50~200g in fabric solid content per square meter, in the case of less than 50 g / m ^2, deodorizing performance for a small amount of activated carbon and clay mineral becomes insufficient, beyond 200 g / m ² When applied, the rigidity of the fabric becomes too large and the texture is impaired.

Fabrics suitable for the back coating agent of the present invention are woven fabrics, knitted fabrics, and nonwoven fabrics composed of natural fibers, synthetic fibers, or both fibers, and specifically, woven fabrics, moquettes,
Examples include toweling, tricot, double raschel, circular knitting, and needle punching. The fibers referred to here include natural fibers such as cotton, hemp, silk, and wool, or rayon, acetate, protein fibers, chlorinated rubber, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyester, polyethylene, and polypropylene. , Polyurethane, polyvinylidene cyanide, and polyfluoroethylene. Alternatively, a fabric made of both fibers may be used.

Further, the back coating agent of the present invention can be used in combination with a fabric provided with conductivity in order to release static electricity generated by friction of the surface of the skin material.

The conductive fabric referred to here is a material in which conductive materials such as copper, aluminum, stainless steel, carbon, and a conductive polymer are mixed into organic fibers in a particulate form, or a vacuum evaporation method is applied to the surface of the organic fibers. Woven fabric, knitted fabric, non-woven fabric which is coated with or coated with the organic fiber, or contains 0.1 to 20% by weight of a conductive fiber consisting of a conductive substance itself with respect to the fabric. Include woven fabric, moquette, toweling, tricot, double raschel, circular knitting, needle punch and the like. In this case, as fibers mainly constituting the fabric, natural fibers such as cotton, hemp, silk and wool, rayon, acetate, protein fibers, chlorinated rubber, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, Examples include chemical fibers such as polyester, polyethylene, polypropylene, polyurethane, polyvinylidene cyanide, and polyfluoroethylene. Or you may comprise from both these fibers. 0.1% by weight conductive fiber content
If the amount is less than the above, static electricity is not sufficiently dissipated because the conductivity of the fabric is poor. If the amount exceeds 20% by weight, the color of the conductive fiber itself has a large effect on the color of the entire fabric, and the fabric originally has It will impair the appearance and texture. In addition, the effect of suppressing static electricity does not increase while the cost is high.

As a method for adding conductive fibers to the fabric, mixing in a fiber state, mixing in a sliver state, twisting in a thread form,
Any of a mixture in the form of a filament, a twisted yarn, and an arrangement on a texture may be used.

When a mixture of activated carbon and clay mineral is used as a deodorant contained in the back coating agent, the content of the activated carbon contained in the back coating agent is 40 to 90% of the total amount of the clay mineral and the activated carbon. Is preferred. If the content of activated carbon is less than 40% by weight, the effect of dissipating static electricity is not sufficient, and if it exceeds 90% by weight, as described above, the adsorption characteristics of clay minerals are not sufficiently exhibited. The deodorizing performance is impaired.

In the method for producing the back coating agent of the present invention, water, clay mineral, activated carbon, dispersant and latex may be mixed in any order as long as the latex is added after the addition of the dispersant.

If latex is added to a mixed solution containing no dispersant, latex particles may aggregate and precipitate.

〔Example〕

Hereinafter, the present invention will be described based on examples, but the present invention is not limited by these examples unless it exceeds the gist thereof.

(Example 1) In 500 parts by weight of water, 90 parts by weight of coconut shell activated carbon of 150 mesh (100 microns) or less and 4 parts by weight of carboxymethylcellulose having a molecular weight of 100,000 were put, and mixed with a propeller-type stirrer.
The mixture was mixed and stirred at a rotation speed of 3000 rpm for minutes. Next, 130 parts by weight of an acrylate latex was added to the above mixture, and 1
The mixture was stirred at a rotation speed of 500 rpm for 3 minutes to obtain a uniform back coating agent.

In order to grasp the dispersion state of the activated carbon in the obtained back coating agent, the clay of the back coating agent was measured with a viscometer.

For comparison, a back coating agent mixed with activated carbon having a large particle diameter was prepared as follows.

90 parts by weight of coconut shell activated carbon having a size of 50 mesh (300 microns) or less was mixed and stirred with 500 parts by weight of water for 5 minutes using a propeller stirrer to form a slurry. 4 parts by weight of carboxymethylcellulose having a molecular weight of 100,000 was added to 590 parts by weight of the slurry, and the mixture was mixed and stirred using a propeller mixer.
594 parts by weight of the slurry after dispersion and 130 parts by weight of the acrylate latex were stirred for 3 minutes with a propeller stirrer to obtain a back coating agent for comparison.

The viscosity of the back coating agent of the comparative example was measured in the same manner as described above. Comparative example is less than 1 month and initial viscosity is 1500
Although the cP decreased from cP to 1000 cP or less, the back coating agent of this example had a viscosity of 2000 cP at the initial stage and had a viscosity of 1000 cP or more even after 3 months. This indicates that the dispersed state of the activated carbon is good even after 3 months, and that the back coating agent of the present example can sufficiently withstand use.

On the other hand, in the comparative example, precipitation occurred after 2 weeks of preparation, and after 3 weeks, most of the solid content was precipitated and became unusable.

Further, a seat assembly for one vehicle was produced using the vehicle skin material produced by applying the back coating agent of the present example, and was attached to a 4-door Edan. After installation, the window glass, door, and ventilator were closed and one cigarette was burned in the room. In order to ascertain the odor intensity remaining in the passenger compartment after being left for one day in this state, 12 panelists alternately boarded the car, and the odor in the passenger compartment was evaluated by a six-stage odor intensity display.

For comparison, a vehicle skin material containing no adsorbent was attached to an actual vehicle in the same manner as described above, and the odor was evaluated. The odor intensity was 3.5 in the comparative example,
In this example, the value was 2.1, and the odor was significantly reduced by the skin material of this example.

In addition, in the evaluation by the odor intensity display of 6 levels of odor, 0 is “odorless”, 1 is “odor that can be finally sensed”,
2 indicates "a weak smell which indicates what smell", 3 indicates "easy smell", 4 indicates "strong smell" and 5 "strong smell".

(Example 2) A back coating agent was prepared in exactly the same composition and order as in Example 1 except that the particle size of the coconut shell activated carbon was 325 mesh (44 microns) or less. When the viscosity of the back coating agent of this example was measured, it was 10
It has a viscosity of 00 cP or more and the sedimentation rate of activated carbon is slow,
A long-life back coating agent was obtained.

Example 3 A back coating agent was prepared in exactly the same composition and order as in Example 1, except that the particle size of the coconut shell activated carbon was 400 mesh (38 microns) or less. When the viscosity of the back coating agent of this example was measured, it was 10
It has a viscosity of 00 cP or more and the sedimentation rate of activated carbon is slow,
A long-life back coating agent was obtained.

Example 4 A back coating agent was prepared in a different order from that of Example 1 as follows.

90 parts by weight of coconut shell activated carbon of 325 mesh or less, molecular weight 10
4 parts by weight of carboxymethylcellulose of 0,000 was dry-mixed using an omni mixer to obtain a mixed powder. 94 parts by weight of the mixed powder and 500 parts by weight of water were mixed and stirred with a homomixer for 3 minutes to form a slurry. 594 parts by weight of the slurry and 130 parts by weight of the acrylate latex were stirred for 3 minutes with a propeller stirrer to obtain a uniform back coating agent.

The back coating agent of the present example was 10
A long-life back coating agent having a viscosity of 00 cP or more and a low sedimentation rate of activated carbon was obtained.

Example 5 A back coating agent was prepared in a different order from that of Example 1 as follows.

90 parts by weight of coconut shell activated carbon of 325 mesh or less was mixed and stirred with 500 parts by weight of water using a propeller stirrer for 5 minutes to form a slurry. 4 parts by weight of carboxymethylcellulose having a molecular weight of 100,000 was added to 590 parts by weight of the slurry, and the mixture was mixed and stirred using a propeller mixer. 594 parts by weight of the slurry after adding the dispersant and 130 parts by weight of the acrylate latex were stirred for 3 minutes with a propeller stirrer to obtain a uniform back coating agent.

The back coating agent of the present example was 10
A long-life back coating agent having a viscosity of 00 cP or more and a low sedimentation rate of activated carbon was obtained.

(Example 6) In 500 parts by weight of water, 45 parts by weight of sepiolite having a size of 100 mesh or less, and activated carbon of coconut shell having a size of 150 mesh (100 microns) or less.
45 parts by weight, 4 parts by weight of carboxymethylcellulose having a molecular weight of 100,000, and 3,000 rpm for 5 minutes with a propeller type stirrer
The mixture was stirred at a rotation speed of. Next, 130 parts by weight of an acrylate latex was added to the above mixture, and the mixture was stirred at 1500 rpm for 3 minutes to obtain a uniform back coating agent.

The viscosity of the back coating agent was measured with a viscometer in order to grasp the dispersion state of the activated carbon in the obtained back coating agent.

For comparison, a back coating agent mixed with activated carbon having a large particle diameter was prepared as follows.

45 parts by weight of sepiolite less than 100 mesh and 45 parts by weight of coconut shell activated carbon less than 50 mesh (300 microns) in water 500
The parts by weight were mixed and stirred for 5 minutes using a propeller stirrer to form a slurry.

4 parts by weight of carboxymethylcellulose having a molecular weight of 100,000 was added to 590 parts by weight of the slurry, and the mixture was mixed and stirred using a propeller mixer. 594 parts by weight of the slurry after adding the dispersant and 130 parts by weight of the acrylate latex were stirred for 3 minutes with a propeller stirrer to obtain a back coating agent for comparison.

The viscosity of the back coating agent of the comparative example was measured in the same manner as described above. The comparative example is less than 1 month and has an initial viscosity of 15
Although the viscosity decreased from 00 cP to 1000 cP or less, the back coating agent of the present example had a viscosity of 2000 cP at the initial stage, and had a viscosity of 1000 cP or more even after 3 months. This indicates that the dispersed state of the activated carbon is good even after 6 months, and that the back coating agent of the present example can sufficiently withstand use.

On the other hand, in the comparative example, precipitation occurred 2 weeks after the preparation, and
After a week, most of the solids precipitated and became unusable.

Further, a seat assembly for one vehicle was produced using the vehicle skin material produced by applying the back coating agent of the example, and was attached to a 4-door sedan. After installation, the window glass, door, and ventilator were closed and one cigarette was burned in the room. In order to ascertain the odor intensity remaining in the passenger compartment after being left for one day in this state, 12 panelists alternately boarded the car, and the odor in the passenger compartment was evaluated by a six-stage odor intensity display.

For comparison, a vehicle skin material containing no adsorbent was attached to an actual vehicle in the same manner as described above, and the odor was evaluated.
The odor intensity of the comparative example was 3.5, while that of the present example was 1.6, and the odor was significantly reduced by the skin material of the present example.

In addition, in the evaluation by the odor intensity display of 6 levels,
0 is "odorless", 1 is "smell that can be finally sensed", 2 is "smell smell to know what smell", 3 is "smell easily sensed", 4 is "strong smell" and 5 is "smell smell" Is shown.

Example 7 A back coating agent was prepared in exactly the same composition and order as in Example 6, except that the viscosity of the coconut shell activated carbon was 325 mesh (44 microns) or less. When the clay of the back coating agent of this example was measured, even after 6 months had passed.
A long-life back coating agent having a viscosity of 1000 cP or more and a low sedimentation rate of activated carbon was obtained.

Example 8 A back coating agent was prepared in exactly the same composition and order as in Example 6, except that the particle size of the coconut shell activated carbon was 400 mesh (38 microns) or less. When the viscosity of the back coating agent of this example was measured, even after 6 months had passed.
A long-life back coating agent with a viscosity of 1000 cP or more and a low sedimentation rate of activated carbon was obtained.

(Example 9) A back coating agent was prepared as follows in a different order from that of Example 6.

45 parts by weight of sepiolite of 100 mesh or less, 45 parts by weight of coconut shell activated carbon of 325 mesh or less, and 4 parts by weight of carboxymethyl cellulose having a molecular weight of 100,000 were dry-mixed using an omni-mixer to obtain a mixed powder. 94 parts by weight of the mixed powder and 500 parts by weight of water were mixed and stirred with a homomixer for 3 minutes to form a slurry. Using a propeller stirrer, 594 parts by weight of the slurry and 130 parts by weight of acrylate latex
After stirring for a minute, a uniform back coating agent was obtained.

The back coating agent of the present example can be used after 6 months.
A long-life back coating agent having a viscosity of 1000 cP or more and a low sedimentation rate of activated carbon was obtained.

Example 10 A back coating agent was prepared in the order different from that of Example 6 as follows.

45 parts by weight of sepiolite of 100 mesh or less and 45 parts by weight of coconut shell activated carbon of 325 mesh or less were mixed and stirred with 500 parts by weight of water for 5 minutes using a propeller stirrer to form a slurry.

To 590 parts by weight of the slurry, 4 parts by weight of carboxymethyl cellulose having a molecular weight of 100,000 were added, and the mixture was mixed and stirred using a propeller mixer. Slurry after adding dispersant 594
Parts by weight and 130 parts by weight of the acrylate latex were stirred with a propeller stirrer for 3 minutes to obtain a uniform back coating agent.

The back coating agent of the present example can be used after 6 months.
A long-life back coating agent having a viscosity of 1000 cP or more and a low sedimentation rate of activated carbon was obtained.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takatoshi Sekihara 1-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Boshoku Corporation (72) Inventor Akihiro Matsuyama 1-1-1, Toyota-cho, Kariya-shi, Aichi Toyota Boshoku Corporation (72) Inventor: Osamu Araki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Yoshio Yamada 1 Toyota Town, Toyota City, Aichi Prefecture Examiner, Toyota Motor Corporation Masato Matsunawa (56) References JP-A-2-145864 (JP, A) JP-A-62-282927 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06M 15/00-15/715 D06M 11 / 00-11/84

Claims (2)

(57) [Claims] 1. A fabric back coating agent comprising 50 to 180 parts by weight of activated carbon having a particle size of 100 μm or less and 3 to 20 parts by weight of a dispersant per 100 parts by weight of a solid content of a polymer latex. 2. The back coating agent according to claim 1, wherein the total amount of the hydrous magnesium silicate clay mineral and activated carbon is 50%.
A back coating agent for fabrics, which is added in an amount of 10 to 90% by weight of 180 to 180 parts by weight.