CS245869B1 - Oil-in-water type emulsion on base of silane derivative - Google Patents

Abstract

The present invention provides an emulsion suitable for surface treatment treatment of glass fibers. composed it is from cyclohexenylethyltriethoxysilane with acyl polyglycol ethers based on fatty acids or ethylene oxide block propylene oxide copolyiners by weight 1: 0.05 to 1 with a water content of 40 to 99.8% by weight of water.

Description

(54) Oil-in-water emulsion based on a silane derivative

2

The invention describes an emulsion suitable for the surface treatment of glass fibers. It consists of cyclohexenylethyltriethoxysilane with fatty acid acyl polyglycol ethers or block ethylene oxides - propylene oxide copolyiners in a weight ratio of 1: 0.05 to 1 with a water content of 40 to 99.8% by weight of water.

The invention relates to an oil-in-water emulsion based on a silane derivative prepared by emulsification using surfactants suitable for surface treatment of glass fibers.

The icone-based emulsions have found wide and continually expanding application use, especially as anti-adhesive, water-borne and glidants, especially in the textile industry (cf. No. 189 817, 181 453, 181 452). By suitably combining the silicone, the surfactant and other additives, it is possible to control the properties of the emulsion according to their desired application needs.

The substituted trialkoxysilanes have also found wide application in the field of glass fiber surface treatments. Although various methods for applying these compounds to the surface of fillers are known, the use of aqueous ones is of utmost importance for industrial applications. because there is no need to work with organic solvents, which are often toxic and sluggish. Aqueous compositions are prepared either by hydrolysis of the trialkoxysilanes, to the corresponding unstable silantrioles (CSA No. 183 491, NSR Pat. No. 2,225,143) or by emulsification, usually in the presence of surfactants to oil-in-science emulsions (CSA). No. 195 225, British Patent No. 1009 908).

Cyclohexenylethyltriethoxysilane is known and is predominantly by reaction of 4-vinylcyclohexene with triethoxysilane. It is used to improve the adhesion of rubbers, phenolplasts and the like. either in the form of solutions in organic solvents or in concentrated form. Aqueous solutions of this silane derivative can be prepared by hydrolyzing it, but because the conventional hydrolysis processes and catalysts take about 20 hours to proceed, this process is practically impracticable since it is not operative. The above-mentioned disadvantages are overcome by the solution according to the invention.

The invention provides an oil-in-water emulsion based on a silane derivative prepared by emulsifying using surfactants suitable for treating glass fibers. SUMMARY OF THE INVENTION It consists of cyclohexenylethyltriethoxysilane and a surfactant selected from the group consisting of acyl polyglycol ethers of the general formula

R-CO-O (C ₂ H ₄ O) _n H wherein R represents alkyl or alkenyl of 7 to 17 carbon atoms, n is an integer. 8 to 14

Table 1 and block ethylene oxide-propylene oxide copolymers having an average molecular weight of 2,000 to 5,000 with a bound ethylene oxide content of 15 to 40% by weight in a weight ratio of silane: surfactant equal to 1: 0.05 to 1 and containing 40 to 99 , 8% by weight of water.

The emulsions can be prepared by known methods, mainly using mechanical energy (high speed stirrers, colloid mills, mixers) and ultrasound. According to the process chosen, emulsifiers can be added directly to the silane derivative or to water. The emulsions can be used to produce glass fiber lubricants used to make transparent fiberglass.

In the case that the fibers are treated by difficult textile operations, especially in the production of glass fabrics, it is preferable to use a larger amount of emulsifier, which at the same time acts as a lubricant. The emulsions prepared are stable, practically odorless, do not cause fiber darkening, and can be applied in an acidic environment, which typically have glass fiber treatment compositions. The emulsions can be prepared as concentrated, stem, which in the next phase can be combined with other components of the lubricating compositions, or diluted with water to the desired concentration. It is also possible to proceed in such a way that the desired derivative concentration, as a rule 0.1 to 0.5 washes. the weight in water is prepared directly for application.

The invention is further elucidated by way of examples in which the composition is given by mass concentration.

Example 1

A block ethylene oxide-propylene oxide copolymer prepared by polyaddition of 55 moles of propylene oxide to 1 mole of trimethylolpropene followed by addition of 23 moles of ethylene oxide having a hydroxyl number of 40 mg KOH / g and an average molecular weight of 4,300 was prepared by emulsion preparation. 20 g of cyclohexenylethyltriethoxysilane and emulsified by adding to 200 ml of water using a mixer. The emulsions prepared in this way are white, stable under acidic conditions and the amount of copolymers is given in Table 1.

copolymer (g) surface tension stability (mN.in-W ° C) (days)

1.0 32.6 7

2.0 31.0 7

4.0 29.9 7

10.0 29.3> 10

20.0 28.8> 10

Example 2 was added to 20 g of cyclohexenylethyltriethoxysilane. The compositions are emulsified

To prepare the emulsions, acyl polyglyco was added by adding to 200 ml of water using coconut fatty acid mixer ethers. The amount of emulsifier and the properties of the emulsion oil (C ₈ -C ₁₈ ) with 10 moles of ethylene oxide are given in Table 2.

Table 2 emulsifier (gj surface tension stability (mN. M ^-1 / 20 ° C) (days)

30.5> 10

30.3> 10

29.9> 10

Because of the life of the lubricant compositions! approximately 1 day is sufficient to use lower emulsifier concentrations. Higher concentrations are preferred to use in the formulation! used to treat glass fibers processed into fabrics. When using e.g. of the oxyethylated alkyphenols as emulsifiers is not only less stable, about hours, but the emulsions also have a weak affinity for glass fibers.

Claims (2)

SUBJECT Oil-in-water emulsion based on a silane derivative, obtainable by emulsion using surfactants, suitable for treating glass fibers, characterized in that the emulsion is composed of cyclohexenylethyltriethoxysilane and a surfactant selected from the group consisting of acylpolyglycol ethers of the general formula R-CO-O (C ₂ H ₄ O) _n H invention wherein, R is alkyl or alkenyl of 7 to 17 carbon atoms, n is an integer of 8-14, and block ethylene oxide-propylene oxide copolymers with an average molecular weight of 2000-5 000 with a bound ethylene oxide content of 15 to 40% by weight in a silane derivative: surfactant ratio of 1: 0.05 to 1 and containing 40 to 99.8% by weight of water.