JPH05311122A - Surface treating agent for asbestos-containing molded article - Google Patents

Abstract

PURPOSE:To obtain a surface treating agent for asbestos-containing molded articles being surely stuck fast to the surface of slate without applying an undercoating agent, facilitating execution in a surface treating agent blended with an organic polymer compound emulsion for preventing release of asbestos with time. CONSTITUTION:A surface treating agent for asbestos-containing molded articles comprises an organic polymer compound emulsion as the first component and a silane coupling agent as the second component wherein 100 pts.wt. polymer compound in the organic polymer compound emulsion is blended with 0.5-10.0 pts.wt. calculated as solid content ratio of the silane coupling agent. The surface treating agent may be further mixed with colloidal silica as the third component in the ratio of solid content of 10-150 pts.wt. colloidal silica to 100 pts.wt. polymer compound in the organic polymer compound emulsion besides the first and the second components.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to asbestos-containing moldings used as building materials, heat insulating materials, etc., which are deteriorated with time, and asbestos fibers are exfoliated from the surface of the moldings, or when asbestos is dismantled in an old building. The present invention relates to a surface treatment agent for an asbestos-containing molded article for preventing fibers from scattering.

[0002]

2. Description of the Related Art Asbestos fibers are inexpensive, have excellent fire resistance, and also serve as a reinforcing material for cement molded products. Therefore, building materials (slate) formed by mixing these asbestos fibers into cement to form flat or corrugated plates are It is widely used as a roofing material and wall material for buildings. Further, a refractory heat insulating material formed by using cement as a binder into a cylindrical shape, a plate shape or any other shape is also used. However, this asbestos fiber is listed as one of the promising candidates for a carcinogen, and is attracting the attention of those concerned. Therefore, before the asbestos-containing building material that has been constructed deteriorates with time and the asbestos fibers in the surface layer begin to come off, it is necessary to perform some work to prevent this coming off. When dismantling an old building, it is necessary to take measures to prevent the scattering of asbestos fibers from the crushed building materials containing asbestos.

[0003] As a conventional technique concerning such measures,
For example, in the case of a slate roofing material, a method of applying a synthetic resin-based coating agent to the surface thereof is used.
Further, a method has also been devised in which cement mortar mixed with a synthetic resin emulsion and a reinforcing material such as an inorganic or organic fiber is sprayed to a required thickness on the upper surface of the slate roof which has begun to deteriorate to form a coating reinforcing layer.

[0004]

However, the synthetic resin coating agent has a poor adhesion to the slate surface,
In particular, when asbestos begins to come off, it becomes more difficult to adhere, so it was necessary to apply a sealer as an undercoat in advance. Also, on the slate roof that started to deteriorate,
The method of laminating the reinforced mortar layer involves complicated work of preparing cement mortar at the construction site, and requires a professional. Therefore, an object of the present invention is to use an organic polymer compound emulsion such as a synthetic resin as a main ingredient, and to have a composition in which a silane coupling agent and colloidal silica are added as necessary, and a work step of undercoating is required. It is an object of the present invention to provide a surface treatment agent for an asbestos-containing molded article which can be easily applied to the surface of a slate or the like and has excellent adhesion.

[0005]

In order to achieve the above object, a surface treatment agent for an asbestos-containing molded article according to the present invention comprises an organic polymer compound emulsion as a first component and a silane cup as a second component. A composition containing a ring agent, and the silane coupling agent in an amount of 0.5 to 10.0 parts by weight in terms of solid content based on 100 parts by weight of the polymer compound in the organic polymer compound emulsion. And Then, in addition to the first component and the second component, colloidal silica as a third component is used in a solid content ratio of 10 to 150 parts by weight with respect to 100 parts by weight of the polymer compound in the organic polymer compound emulsion. You may mix in the ratio of.

[0006]

When the surface-treating agent of the present invention is applied to the surface of an asbestos-containing molding such as slate at a rate of, for example, 0.5 Kg / m ² , the alkoxy group contained in the silane coupling agent as the second component is applied. Further, among the organic functional groups, the alkoxy group is hydrolyzed by the water present by adhering to the asbestos-containing molded product to become a silanol group, and chemically bonds to the surface of the inorganic asbestos-containing molded product. On the other hand, the organic functional group is chemically bonded to the organic functional group possessed by the organic polymer compound as the first component. Therefore, the cured coating of the surface treatment agent firmly adheres to the surface of the asbestos-containing formed product without using a primer such as a sealer as in the conventional case. Then, depending on the type of the organic polymer compound, by adding colloidal silica as the third component, the adhesiveness to the asbestos-containing molded article is increased and the curing of the coating film is accelerated. The amount of the silane coupling agent based on 100 parts by weight of the polymer compound in the organic polymer compound emulsion is 0.5 parts by weight or less in terms of solid content, and the above effects cannot be obtained, and the amount is more than 10.0 parts by weight. Even if it increases, the effect does not increase, but only the cost increases.
Also, the polymer compound 1 in the organic polymer compound emulsion
If the amount of colloidal silica blended with 00 parts by weight is 10 parts by weight or less in terms of solid content, the above effect cannot be obtained, and 1
If it is more than 50 parts by weight, the water resistance of the cured coating is adversely affected.

[0007]

EXAMPLE As the organic polymer compound emulsion as the first component, those conventionally used as vehicle forming agents for various coating agents can be used. That is, vinyl acetate resin emulsion, acrylic ester resin emulsion, acrylic / styrene copolymer resin emulsion, ethylene / vinyl acetate resin emulsion, vinyl acetate / veova copolymer resin emulsion, polyester resin emulsion, urethane resin emulsion, epoxy resin emulsion, Examples thereof include vinyl chloride latex, vinyl chloride / ethylene latex, vinyl chloride / ethylene / acrylic latex, vinylidene chloride latex, vinylidene chloride / acrylic latex. However, among these, acrylic acid ester resin emulsions and acrylic copolymer resin emulsions, which are particularly excellent in weather resistance and alkali resistance, are particularly preferable.

As the silane coupling agent as the second component, γ-glycidoxypropyltrimethoxysilane,
Epoxysilanes such as γ-glycidoxypropylmethyldiethoxysilane. Aminosilanes such as γ-aminopropyltriethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, and N-β (aminoethyl) γ-aminopropylmethyldimethoxysilane. Vinylsilanes such as vinyltrichlorosilane, vinyltris (β-methoxyethoxy) silane, vinyltriethoxysilane, and vinyltrimethoxysilane. Metacloxysilanes such as γ-methacryloxypropyltrimethoxysilane and γ-metacryloxypropyldimethoxysilane. It is appropriately selected from γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane and the like. These silane coupling agents play a role of "anchor" for firmly adhering the cured film of the organic polymer compound emulsion forming the vehicle to the surface of the asbestos-containing molded article such as slate, The alkoxy group is hydrolyzed to chemically bond to the surface of the inorganic material such as slate, and the organic functional group (amino group, epoxy group, etc.) is chemically bonded to the organic functional group of the organic polymer compound.

As the colloidal silica as the third component, a commercially available one having a particle size of 10 to 20 mμ, for example, Adelite AT-20 (manufactured by Asahi Denka Kogyo Co., Ltd.) is used.

The surface treatment agent of the present invention includes the above-mentioned first to third
In addition to the components, a film-forming auxiliary agent, a flame retardant agent, etc. may be added, if necessary, so these auxiliary agents will be described below. When the minimum film-forming temperature of the organic polymer compound emulsion is higher than the temperature of the working environment, the work cannot be carried out unless the minimum film-forming temperature is lowered to the environmental temperature or lower by some means. As a means for this, a film formation accelerator is incorporated into the surface treatment agent. As the film formation accelerator, xylene, cellosolve acetate, hexylene glycol, texanol,
Butyl cellosolve, carbitol acetate, butyl carbitol, butyl carbitol acetate, 2,2
4-trimethyl 1,3-pentadiol monoisobutyrate, dibutyl phthalate, dioctyl phthalate and the like can be mentioned. Among them, butyl carbitol acetate, which has the property of not lowering the water resistance, is particularly preferable.

When the cured film of the surface treatment agent is required to have flame retardancy, the first component, such as a vinyl chloride type copolymer resin emulsion, is used, or the surface treatment agent is appropriately selected. Add a flame retardant. Examples of the flame retardant include phosphoric acid esters such as trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricresyl phosphate, cresyl phenyl phosphate and triphenyl phosphate. Halogenated phosphoric acid ester such as tris (chloroethyl) phosphate, tris (2-chloropropyl) phosphate, tris (2,3-dichloropropyl) phosphate, tris (2,3-bromopropyl) phosphate, tris (bromochloropropyl) phosphate .. Polychloroparaffin, chlorinated polyethylene, perchloropentacyclodecane, tetrabromoethane, tetrabromobutane,
Halogen compounds such as TBA derivatives, hexabromocyclodecane, and decabromodiphenyl oxide. Inorganic flame retardants such as antimony trioxide, barium borate and aluminum hydroxide can be used.

Further, if necessary, as a coloring / filling agent,
Calcium carbonate, kaolin clay, talc, mica, titanium oxide, aluminum paste, etc. may be blended, or silicon wax, zirconium compound, lithium silicate, fluorine compound, etc. may be added as a water repellent or water absorption inhibitor. .. Also, depending on the raw material composition of the surface treatment agent,
Thickeners, defoamers, dispersants, leveling agents, preservatives, rust inhibitors, etc. are added.

Next, some examples of formulation of the surface treatment agent according to the present invention will be listed below. << Compounding example No.1 >> Adeka Resin EPE-0450 (Epoxy resin emulsion NV 48% manufactured by Asahi Denka Co., Ltd.) 100 parts by weight γ-glycidoxypyropyrmethyldiethoxysilane 1 part by weight << Compounding example No.2 >> Pegal 750 (Acrylic ester copolymer resin emulsion NV 50% manufactured by High Pressure Gas Industry Co., Ltd.) 100 parts by weight γ-glycidoxypyropyrtrimethoxysilane 1 part by weight Adelite AT-20 (Colloidal silica NV 20% manufactured by Asahi Denka Co., Ltd.) ) 55 parts by weight Butyl carbitol acetate 10 parts by weight << Blending example No.3 >> Pegal 619 (Vinyl acetate / veova copolymer resin emulsion NV50% manufactured by High Pressure Gas Industry Co., Ltd.) 100 parts by weight γ-glycidoxypyropyrtrimethoxy Silane 1 part by weight Snowtex C (Nissan Chemical Co., Ltd. Colloidal Silica NV 20%) 30 parts by weight Surfynol 104A 0.3 parts by weight Hydroxyethyl cellulose (2% aqueous solution) 23 parts by weight Titanium oxide 80 parts by weight Water 50 parts by weight << Compounding Example No. 4 >> Pegal 750 100 Parts by weight γ-glycidoxypyropyrtrimethoxysilane 1 part by weight Aderite AT-20 20 parts by weight butyl carbitol acetate 10 parts by weight decabrom diphenyl oxide 15 parts by weight antimony trioxide 25 parts by weight water 50 parts by weight The above formulation example No. In order to prepare the surface treatment agents 1 to 4, it is sufficient to uniformly mix the raw materials of the components using a known stirring / mixing device.

Each of the above surface-treating agents is applied to the surface of the slate roofing material whose surface layer is somewhat weathered or the surface of the slate roofing material immediately after the roofing is passed, for example, after several years of construction, to prevent the weathering from progressing. In order to increase the strength, first, high-pressure washing water is sprayed on the surface of the slate using a jet nozzle to remove dirt on the surface. If you cannot spray the wash water, use an industrial vacuum cleaner to remove the dirt. When the surface of the slate is not dried, it is sprayed with a surface treatment agent using an air spray gun or the like so that the applied amount is, for example, about 0.5 Kg / m ² when washed with water. .. The sprayed layer of the surface treatment agent becomes a cured coating after 3 days at room temperature.

As described above, the test pieces collected from the slate to which the surface treatment agents of formulation examples Nos. 1 to 4 were applied were subjected to comparative tests of some characteristics. In this comparative test, in order to confirm the effects of the silane coupling agent and colloidal silica, which are the characteristic components contained in the surface treatment agent of the present invention, on the above characteristics, the following two comparative formulation examples No. 5 and No. 6 are given. Samples were also prepared and sprayed on slate to prepare test pieces for comparison. << Comparative formulation example No. 5 >> Pegal 750 100 parts by weight Butyl carbitol acetate 10 parts by weight Water 30 parts by weight << Comparative formulation example No. 6 >> Pegal 750 100 parts by weight γ-glycidoxypyropyrtrimethoxysilane 1 part by weight Adelite AT-20 500 parts by weight Butyl carbitol acetate 10 parts by weight

The comparative test was carried out at room temperature for each of the evaluation items of tensile strength, water resistance, alkali resistance, acid resistance, weather resistance and asbestos peeling resistance. For the asbestos delamination resistance test, use "Fiber Aerosol Monitor FAM-1 type tester" manufactured by Shibata Scientific Machinery Co., Ltd., inside a box with inner dimensions of 1 m x 1 m x 1.5 m (height). A test piece having a predetermined size was placed on the surface of the test piece, and compressed air was blown onto the surface of the test piece to check the amount of the asbestos fibers peeled off. The water resistance was evaluated by immersing the sample in tap water for 30 days and examining the strength change before and after the immersion. The alkali resistance was evaluated by immersing the sample in saturated slaked lime water for 48 hours and examining the strength change before and after the immersion. The acid resistance was evaluated by immersing the sample in a 5% sulfuric acid aqueous solution for 48 hours and examining the strength change before and after the immersion. The weather resistance was evaluated by examining the change in strength after 1000 hours had passed in a sunshine weatherometer.

The results of the above comparison test are

[Table 1] It is summarized in (Attachment). In the table, the mark “◯” indicates that the properties were satisfactory, and the mark “Δ” indicates that the properties were unsatisfactory. Incidentally, as for the slate which was not treated with the surface treatment agent, the peel resistance of asbestos was measured,
A value of 9,256 lines / cm ³ was shown.

As is apparent from [Table 1], the tensile strength of the test pieces treated with the surface treatment agents of the formulation examples Nos. 1 to 4 containing the silane coupling agent is the same as that of the comparative formulation example containing no silane coupling agent. The value was about 1.5 to 1.8 times that of the test piece to which the surface treatment agent of No. 5 was applied. In addition, since the flame retardant is compounded in the compounding example No. 4 containing colloidal silica, the tensile strength and the peeling resistance should be deteriorated by that amount. Formulation example lacking colloidal silica It was kept the same as that of No.1. However, as shown in Comparative Blending Example No. 6, if too much colloidal silica is added, the above-mentioned effects of the silane coupling agent are almost lost.

[0018]

As is apparent from the above description, the surface treatment agent for asbestos-containing molded articles according to the present invention uses the organic polymer compound emulsion as the first component for vehicle formation and the silane as the second component. By incorporating a coupling agent and, if necessary, colloidal silica as the third component, a cured coating can be adhered to this surface without applying a primer such as a sealer to the work surface in advance as in the conventional case. Be done. Depending on the type of the organic polymer compound emulsion, the addition of colloidal silica not only improves the adhesion, but also has the effect of accelerating the curing of the coating and increasing the hardness and strength of the coating.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kamiji Toda, No. 5 Doyamacho, Kita-ku, Osaka City High Pressure Gas Industry Co., Ltd. Takamatsu Oil & Fat Co., Ltd. (72) Inventor Isou Sobu, 2-30 Shinei 2-chome, Naka-ku, Nagoya City Kyowa Industry Co., Ltd.

Claims (2)

[Claims] 1. A polymer compound 1 in an organic polymer compound emulsion, comprising an organic polymer compound emulsion as a first component and a silane coupling agent as a second component.
A surface treatment agent for an asbestos-containing molded article, wherein the silane coupling agent is blended in a proportion of 0.5 to 10.0 parts by weight in terms of solid content with respect to 00 parts by weight. 2. A polymer in an organic polymer compound emulsion, comprising an organic polymer compound emulsion as a first component, a silane coupling agent as a second component, and colloidal silica as a third component. Compound 1
Asbestos, characterized in that the silane coupling agent is blended in a proportion of 0.5 to 10.0 parts by weight and the colloidal silica is blended in a proportion of 10 to 150 parts by weight with respect to 00 parts by weight. Surface treatment agent for contained moldings.