JPH01301536A - Antifouling agent for glass, antifouling glass and method for transparentizing fouled glass - Google Patents

Abstract

PURPOSE:To enable effective suppression of contamination by silicon oxide, by using an aqueous polyurethane resin obtained from a specific polyhydroxy compound or polyvalent amine compound and an organic polyisocyanate as an essential component. CONSTITUTION:The above-mentioned antifouling agent contains an aqueous polyurethane resin obtained from (a) a polyhydroxy compound containing >=2 active H atoms reactive with -NCO groups or (b) a polyvalent amine compound containing >=2 active H atoms having reactive with the -NCO groups and (c) an organic poyisocyanate as an essential component. For example, diethylene glycol, bisphenol A, etc., are cited as the component (a) and ethylenediamine, polyamide resin, etc., are cited as the component (b). Naphthylene, isophorone diisocyanates, etc., are cited as the component (c). Fouling can be prevented by applying the antifouling agent to the glass surface and forming a film without complicatedness in post-treatment, corrosion of metal, bad influences on human bodies, environment, etc.

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to means for preventing glass contamination in vehicles, ships, houses, optical equipment, etc., and more specifically, a glass contamination prevention agent containing a film-forming water-based polyurethane resin as an active ingredient, and the resin. Concerning anti-pollution glass. [Conventional technique 4#] (Background) It is well known that glass is a material that is easily contaminated. In particular, glass used in the windows of vehicles, ships, houses, etc. is exposed to the wind and rain and is therefore more likely to get dirty.Gloves for lighting equipment are also susceptible to stains due to heat, cigarette smoke, oil smoke from the kitchen, etc. subject to heavy pollution. limited mirror, camera, m
Lenses of optical instruments such as e-mirrors cannot escape contamination sooner or later, and the contamination of these glasses is generally (D oil-based contamination, () metal oxide-based contamination, (2)
It is known that pollution can be roughly divided into silicon oxide-based pollution and pollution caused by soil, sand, dust, etc. (Problems with the Prior Art) Conventionally, as a countermeasure against contamination of glass, it is common to wash the contaminated glass with an acidic, neutral or alkaline detergent and then with water. Washing with these various detergents has practical effects on oil-based pollution, metal oxide-based pollution, soil, dust, etc., but has almost no effect on silicon oxide pollution. Silicon oxide contamination, especially in the windows of vehicles, ships, etc., is important in terms of safety because it affects visibility. Therefore, dissolution cleaning using a hydrofluoric acid cleaning agent has already been proposed. However, such conventional hydrofluoric acid cleaning agents corrode even clean glass surfaces, requiring considerable effort for washing and polishing after cleaning. If water contact is insufficient, clouding will occur, which will actually impair visibility. In addition, hydrofluoric acid has safety and environmental issues, and furthermore, the risk of corrosion to metal parts cannot be ignored.

Problem A to be Solved by the Invention The present invention provides a means for effectively suppressing the contamination of glass surfaces by silicon J oxide, thereby improving The main purpose is to fundamentally solve various problems such as the complexity of post-treatment, corrosion of metals, and adverse effects on the human body and the environment. [Means for Solving the Problems] (Progress of Completion of the Invention) Therefore, as a result of various studies to solve the above problems, the present inventor has developed an organic coating agent made of a specific water-based polyurethane resin that is clean or purified. The film formed by applying it to the glass surface suppresses oil pollution, metal oxide pollution, and general pollution caused by dirt and dust, without adversely affecting anything other than the glass part, and safely for the human body and the environment. It has the property of making the contamination easy to remove, and furthermore, it has the property of preventing contamination caused by silicon oxide, which exhibits strong adhesion to the glass fabric. When a film is deposited on silicon oxide contamination, which is difficult to completely remove due to its presence. The present invention, which has found that the transparency of the contaminated glass can be improved, is based on this finding. (Summary) In order to solve the above problems, the antifouling agent for glass according to the present invention comprises a polyhydroxy compound containing at least two or more active hydrogen atoms reactive with -NCO groups, or the polyhydroxy compound and - The essential components are a water-based polyurethane resin obtained from a polyvalent amine compound containing at least two active hydrogen atoms reactive with NCO groups and an organic polyisocyanate. (Water-based polyurethane resin) The water-based polyurethane resin (coating agent), which is the main component of the glass stain prevention agent of the present invention, is a polyhydroxy compound containing at least two or more active hydrogen atoms reactive with a -Neo group or the polyhydroxy It is a water-based polyurethane resin obtained from an organic polyisocyanate and a polyvalent amine compound containing at least two active hydrogen atoms that are reactive with a compound and a -NCO group. ○〈Polyhydroxy compound〉 Examples of the polyhydroxy compound containing at least two or more active hydrogen atoms include diethylene glycol, butanediol, hexanediol, bisphenol A, dimethylolpropane, glycerin, pentaerythritol, etc. alcohols, alkylene derivatives thereof or esterified products thereof, poly(oxyethylene ether) polyols, poly(oxypropylene ether) polyols, poly(oxyethylene propylene ether) polyols, polyester polyols, polythioether polyols, polyacetal polyols,
Examples include polyol compounds such as polytetramethylene glycol, polybutadiene polyol, and castor oil polyol. O〈Polyvalent amine compound〉 Examples of polyvalent amine compounds containing two or more active hydrogen atoms include ethylenediamine. Examples include low molecular weight polyvalent amines such as propylene diamine, diethylene triamine, triethylene tetramine, and tetraethylene pentamine, and high molecular weight polyvalent amine compounds such as epoxy amine adducts and polyamide resins. 0 (Organic polyisocyanate) Furthermore, as the organic polyisocyanate, naphthylene diisocyanate), inphorone diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, hydrogenated diphenylmethane diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, etc., -cut aliphatic and alicyclic isocyanates alone or as a mixture.

[Effect]

The glass stain prevention agent based on a water-based polyurethane resin according to the present invention is harmless to humans and animals, and forms a transparent cold-resistant film on glass surfaces to which it is applied. This film is durable and
It is hard to scratch and has an excellent antifouling effect against various causes of glass contamination, including silicon oxide contamination, and also has the effect of restoring the transparency of glass surfaces that have already been contaminated with silicon oxide. In addition to the various effects mentioned above, the film of this inhibitor can be easily removed by washing with a neutral detergent, making it suitable as a glass protectant in areas where glass contamination is likely to occur, such as industrial areas. It can be said to have attributes.

[Examples] Hereinafter, the invention will be specifically explained with reference to Examples, but the technical idea of the invention is not influenced by these Examples. Example 1 Polybutylene adipate (molecular weight 12000.2.0 functional) 70 parts by weight, 1.6-hexanediol (molecular weight 11
8.2.0 functional) 20 parts by weight, trimethylolpropane (molecular weight! 34.3.0 functional) 3 parts by weight, dimethylolpropionic acid (molecule al134, 2.0 functional) 6.5
Parts by weight and inphorone diisocyanate (minute 1 t222
．． After synthesizing inocyanate prepolymer consisting of 70 parts by weight (2.0 parts by weight) in acentone, this was mixed and emulsified in water containing triethylamine. What is the crosslinking density of this water-based polyurethane resin? It was 0.132. The above emulsion was coated on a glass plate (1
0c■X 20 layers) Apply to L to a thickness of 5 pot layers, 80
After heating and drying at ℃ for 30 seconds, an outdoor exposure test was conducted for 3 months in winter (December → February). Then, 1% with a 3% aqueous solution of sodium dodecylbenzenesulfonate.
Spray cleaning was carried out under the condition of kg/cs2. The results were as shown in Table 1 below. Table 1: The coating conditions are the same as those of the invented product. Evaluation criteria: O: Good effect, Δ: Some effect X: No effect After spraying to a thickness of 7 μm, it was air-dried and operated commercially for 12 months. During that time, the glass was cleaned with a sodium metasiloxane detergent once every two business operations, and the transparency and ease of cleaning of the glass section were evaluated after 12 months. The results were as shown in Table 2 below. Table 2: Formation of silicic acid-based contamination that is difficult to wash (evaluation criteria) Same as Example 1. Example 3 Polytetramethylene glycol (molecular weight 1100G, 2.0 functional) 70 parts, 1,4-butanediol (molecular weight 90, 2.0 functional) 15 parts, trimethylolpropane (molecular weight 134.3. 0 functional) 7 parts and hexamethylene diisocyanate (molecule 1+ss, 2.
After synthesizing an incyanate prepolymer consisting of 60 parts by weight (0 functional) in 7 cents, a taurine-sodium hydroxide-aqueous solution was mixed therewith, and the mixture was stirred and emulsified. The crosslinking density of this water-based polyurethane resin was 0.344. This emulsion was coated with a roller coater on a ground glass plate (10 cs x 20 cm) that was considered to be contaminated with model silicon oxide, etc. 10. After applying it to the thickness of oil, it was dried at 60℃ for 60 seconds and the transparency was compared.Next, after conducting an outdoor exposure test for 3 months in winter (December → February), dodecylbenzenesulfonic acid 1 with a 3% aqueous solution of sodium
Spray cleaning n1 was carried out under the condition of kg/am', and the ease of cleaning was compared. The results are shown in Table F-3. (Left below) Table 3 ■Coating conditions are the same as the invented product. Relative level when the transparency index of transparent glass is 100 and the same index of ground glass is O. Effects of the Invention As explained below, the present invention provides a means for effectively suppressing the contamination of glass surfaces by silicon oxide, thereby reducing the amount of contamination after cleaning with conventional hydrofluoric acid cleaning agents. Problems such as the complexity of treatment; corrosion of metal; and adverse effects on the human body and the environment can be fundamentally solved. Patent applicant Daiichi Kogyo Seiyaku Co., Ltd.

Claims (1)

[Claims] 1. A polyhydroxy compound containing at least two or more active hydrogen atoms that are reactive with the -NCO group, or the polyhydroxy compound and at least two or more active hydrogen atoms that are reactive with the -NCO group. A stain-preventing agent for glass whose essential components include a water-based polyurethane resin obtained from a polyvalent amine compound and an organic polyisocyanate. 2. Anti-staining glass treated with an anti-staining agent comprising the anti-staining agent for glass according to claim 1. 3. A method for making contaminated glass transparent, which comprises forming a film of the anti-staining agent for glass according to claim 1 on the surface of the stain caused by silicon oxide.