Alkoxy silicon resin intermediate and preparation method thereof

Abstract

The invention relates to an alkoxy silicon resin intermediate and a preparation method of the alkoxy silicon resin intermediate. The alkoxy silicon resin intermediate contains 8-15% of alkoxy; and the alkoxy silicon resin intermediate is of 10-500mm<2>/S based on the viscosity. The preparation method of the alkoxy silicon resin intermediate comprises steps as follows: (1) adding alcohol to organosilane for alcoholysis reaction; (2) adding a catalyst to a product generated in the alcoholysis reaction for condensing for 1-8 hours at 50-200 DEG C, so as to obtain a condensation product; (3) adding water to the condensation product for hydrolyzing at 30-100 DEG C; and (4) neutralizing until reaching pH (Potential Of Hydrogen) of 6-8, removing methanol in the product, and discoloring and filtering to obtain the alkoxy silicon resin intermediate. The alkoxy silicon resin intermediate provided by the invention is applicable to modified organic resin with active hydroxyl functional group, and also can be directly mixed with a curing agent; the alkoxy silicon resin intermediate is applied to coal coating, appliance paint and other high-temperature resistant products; and with adoption of the preparation method of the alkoxy silicon resin intermediate, less by-products are produced and the preparation method is economic and environment-friendly.

Description

technical field [0001] The invention relates to a resin intermediate and a preparation method thereof, in particular to an alkoxy-containing silicone resin intermediate and a preparation method thereof. Background technique [0002] The basic structural unit (main chain) of traditional silicone polymers is composed of Si-O chain links, and the side chains are connected to various other organic groups through silicon atoms. Therefore, the structure of silicone products contains both "organic groups" and "inorganic structures". This special composition and molecular structure makes it integrate the characteristics of organic substances and the functions of inorganic substances, and has high and low temperature resistance , weather aging resistance, electrical insulation, ozone resistance, water repellency, flame retardant, non-toxic, non-corrosive and physiologically inert, and many other excellent properties, and some varieties also have oil resistance, solvent resistance, an...

AI Technical Summary

Problems solved by technology

When the hydroxyl-containing silicone resin intermediate reacts with the organic resin, the hydroxyl group not only reacts with the hydroxyl group of the organic resin, but also undergoes condensation reaction itself, which makes the reaction difficult to control, and sometimes the product is turbid

For example, the hydroxyl silicone resin intermediate reacts with E-44, and after adding a solvent, a transparent product can be obtained, and occasionally a turbid product; and it is difficult to obtain a transparent product by reacting with E-20

And when preparing hydroxyl-containing organic silicon resin intermediates, organochlorosilanes are mainly used to hydrolyze in the presence of solvents such as toluene and xylene, and then separate acid water, and wash the resin liquid to neutrality. This method will produce a large amount of low-concentration acid water 1. The use of organic solvents, etc. will cause environmental pollution, and the obtained silanols need to be stored in solvents, so there are many defects

However, the technology of preparing alkoxy-containing silicone resin intermediates is not yet mature, and there is no effective method for preparing silicone resin intermediates containing certain alkoxy groups.