SU1004287A1 - Solution for producing coating on glass - Google Patents

Description

The invention relates to coating compositions used to strengthen glass and can be used in the glass industry to increase the mechanical strength and abrasion resistance of glass containers during its transportation and operation.

During the production of glass containers and in the process of transportation and operation, its mechanical strength is lost as a result of the appearance of surface microcracks due to friction and collision of the container, as well as mechanical impact on it during production at glass factories and in food processing plants.

A known solution for the protection of glass products of the following composition 1, wt.%:

Polyethylsilox-.

new liquid 45-55

Sukdivol0,1-2,5

. WaterEverything

the closest to the proposed technical essence and the achieved result is a solution of the following composition 2, wt.%:

Polyethylsiloxane fluid 45-55

Dinatrova sulfo-amber salt

acid and alcohol ethoxylates

neonol) 1.5-2.0

WaterStop

The disadvantage of these solutions is the low abrasion resistance of the coating on the articles due to their reduced mechanical strength.

The purpose of the invention is to increase the abrasion resistance of the coating, as well as to reduce its thickness. .

The goal is achieved. We note that the solution for obtaining a coating on glass, including polysilok 20, an emulsifier and water, additionally contains polyvinyl alcohol with an acetyl content of 2-15%, and as an emulsifier, the highest fatty, monocarboxylic acid with

25 the following ratio of components, weight,%:,. Polysiloxane 0,2-5

Higher fat

monocarbon

thirty

Claims (2)

acid 0,01-5 Polyvinyl alcohol with acetyl content of 2-15% 0.1-1. Water Remaining H1. The need to add an additional polyvinyl alcohol, and higher fatty acid to achieve this goal, is due to a number of circumstances, as follows. It is known that the stability of emulsions increases with an increase in the degree of dispersion of the dispersed phase, and for oil-water systems, the most effective emulsifiers are compounds containing a long aliphatic chain and a polar group that are oriented at the phase boundary, respectively, into the oil phase and into the aqueous phase. Such emulgators include higher fatty acids and their salts. However, for the case of (modifying the surface of the glass, the greatest strength of the chemical bond is not ensured by the ionic groups of the salts of these acids, formed during the dissociation of salts in water, but by the carboxyl groups using free fatty acids. Moreover, to form stable emulsions that are stable under extreme conditions For example, at elevated temperatures, a high degree of dispersion of the emulsion is an insufficient condition. Another condition is the formation of an interfacial layer with an increased mechanical 3 minutes strength). Such an interfacial layer can be formed by high molecular weight surfactants, of which PES has a high surface activity. When it is adsorbed on the interface of the oil-water, flowed from the aqueous phase, a strong adsorption layer is formed. Adsorption is irreversible in nature and therefore it provides the highest stability of the emulsion (as compared to low molecular weight surfactants) for a long time and under conditions of increasing system temperature. An additional positive effect of injection of PES is to provide a higher strength and abrasion resistance of the protective coating. However, it was found that the greatest stability of the emulsion of the proposed composition is achieved by using incompletely saponified polyvinyl acetate, i.e., PES, which does not contain residual .acetate groups, and PE, with an acetate content of 2-15% WTO, appears in the production of emulsions. with a high mechanical impedance value of the adsorption layer at the interface, amounting to 5 dyne cm-1% solution compared to 2-3 dyne-cm-PVA retractor of the same concentration, but having a degree of saponification of 99- 99.5%, i.e. containing 0.5-1% residual acetate groups. The effect of increasing the stability of the polysiloxane emulsion is maximum when the concentration of PES in the solution is over 0.1% and remains constant at the concentration of PES more than 1%. The use of solutions of PES of higher concentration to achieve this goal is impractical to increase the viscosity of the emulsions and therefore the effect thickness difference obtained on the glass of the protective layer. As higher fatty acids, it is possible to use both saturated and non-palatable acids with the number of carbon atoms from 12 to 22, and compositions containing oleic, linoleic, stearic, linolenic acid and other acids with 16-18 carbon atoms in the chain have the greatest stability. The use of alkali metal salts of these acids, although it leads to the formation of more finely dispersed emulsions in the absence of PES, in the presence of PES significantly reduces the stability of the emulsions as compared with compositions containing free fatty acids. . As a polysiloxane, polydimethylsiloxane, polymethyl ethylsiloxane, polymethylphenylsiloxane, polydiethylsiloxane, polyethylphenylsiloxane and other polysiloxane liquids with a viscosity of 1000.1 million cSt can be used. Examples of the proposed solutions to obtain a protective coating. Example 1. Polyvinyl alcohol Stearic acid Polydimethylsi0, 20% Loksan 99.69 Eod , 00% 97.35 Water. PRI me R 4. Polyvinyl alcohol1.0% Oleic acid5.0% VKZH-94 5.0%. Water 89 The composition is applied to the glass; Tara in the cold end of Lehr, n 180-200 s. The results of determining the ab resistance of coatings of different co are given in the table. The abrasion resistance of the glass coating is estimated by the highest strength at impact after their collisions between with the shaker for 5 hours. The coated bottles are characterized by a higher chemical intensity and abrasion resistance. The chemical stability of the bottles is characterized by the following parameters: flow rate 0.01 n. hydrochloric acid for titration of 50 ml of the solution is 0.18 ml of coated and 0.22 ml of uncoated. Comparative tests of batches of initial and coated bottles show that the yield of products using the coating increases by 8%. Claim solution for glass coating, including polysiloxane, emulsifier and water, characterized in that, in order to increase the abrasion resistance of the coating, it additionally contains polyvinyl alcohol with an acetyl content of 2-15% and, as an emulsifier, the highest fatty monocarboxylic acid in the following ratio, wt.%: Polysiloxane 0.2-5 Higher fatty monocarboxylic acid. 0.01-5 Poly vinyl alcohol containing acetyl groups 2-15% 0.1-1 Water Remaining Sources of information taken into account during the examination 1. Author's certificate of the USSR 581108, cl. C 03 C 17/28, 1976.; 2. Authors certificate of the USSR 552315, cl. C 03 C 23/00, 1975 (prototype).