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US4732787A Varnishes with high hardness, resistant to abrasion, process for their preparation, and application of these varnishes to coating of solid substrates 失效
具有高硬度，耐磨性，制备工艺和将这些清漆用于固体基材涂层的清漆

Varnishes with high hardness, resistant to abrasion, process for their preparation, and application of these varnishes to coating of solid substrates
Abstract:
A hard, abrasion resistant varnish, for coating the surfaces of solid substrates, comprises a solution in a mixture of solvents:a--4 to 90% by weight, in relation to the total of constituents (a), (b) and (c), of a colloidal silica,b--9 to 95% by weight, in relation to the total of constituents (a), (b) and (c), of the product of hydrolysis and partial condensation of at least one trialkoxysilane;c--1 to 87% by weight, in relation to the total of constituents (a), (b) and (c), of the product of hydrolysis and partial condensation of at least one epoxidized trialkoxysilane;d--0.5 to 9% by weight, in relation to the total of constituents (a), (b) and (c), and (d), of a soluble melamine-formaldehyde and urea-formaldehyde resin.The varnish can optionally contain an acid hardener and secondary adjuvants such as dyes, film tension agents and agents for protection from light.The varnish in contact with the solid substrate to be coated is hardened by heating at about 120.degree. for a time not exceeding 2 hours.
Abstract(Chinese):

用于涂覆固体基材表面的硬质耐磨清漆包含溶剂混合物中的溶液：相对于组分（a），（b）和（c）的总和为4-90重量％ ），相对于至少一种三烷氧基硅烷的水解和部分缩合的产物的组分（a），（b）和（c））的总计，b-9至95重量％的胶体二氧化硅; 相对于至少一种环氧化的三烷氧基硅烷的水解和部分缩合的产物的组分（a），（b）和（c））的总和，c-1至87重量％ 相对于可溶性三聚氰胺 - 甲醛和脲 - 甲醛树脂的组分（a），（b）和（c）和（d））的总量，d-0.5至9重量％。 清漆可以任选地含有酸性硬化剂和辅助助剂，例如染料，膜张力剂和防止光的试剂。 与待涂布的固体基材接触的清漆通过在约120℃加热不超过2小时而硬化。

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