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High-gloss and high temperature resistant silicon-acrylic polyurethane paint and method for preparing same

A silicone-acrylic polyurethane and high-temperature-resistant technology, which is applied in the field of high-gloss and high-temperature-resistant silicone-acrylic polyurethane coatings and their preparation, can solve the problems of destroying the phase continuity of acrylate polymers, low mechanical strength of coating films, poor performance of silicone-acrylic resins, etc. problems, to achieve the effect of improving heat resistance and weather resistance, good mechanical properties, and not easy to yellow

Inactive Publication Date: 2007-11-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because polysiloxane has a very low surface energy, it is easy to migrate to the surface, so that it is easy to be enriched on the surface of the polymer, thus destroying the continuity of the acrylate polymer phase. Therefore, the obtained by random copolymerization modification The performance of silicone acrylic resin is poor, and the mechanical strength of the coating film of the prepared coating is also low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of polydimethylsiloxane refers to Table 1 (preparation formula of polydimethylsiloxane). First, polydimethylsiloxane was prepared according to polydimethylsiloxane formulation 1-1 in Table 1.

[0028] Add the raw materials in the formula into a three-necked flask equipped with a stirrer and a condenser, vacuumize at 60°C for 0.5 hour, then pass nitrogen gas, raise the temperature to 80°C, and react for 3 hours. The temperature was raised to 110° C., and the reaction was continued for 3 hours. Then the temperature was raised to 180° C. and vacuum was applied for 0.5 hours. The molecular weight of the obtained product was 220,000.

Embodiment 2

[0030] Prepare polydimethylsiloxane according to polydimethylsiloxane formula 1-2 in Table 1. The preparation method is the same as in Example 1. The molecular weight of the obtained product was 235,000.

Embodiment 3

[0032] Dimethicone was prepared according to Dimethicone Formulations 1-3 of Table 1.

[0033] Add the raw materials in the formula into a three-necked flask equipped with a stirrer and a condenser, vacuumize at 60°C for 0.5 hour, then pass nitrogen gas, raise the temperature to 90°C, and react for 3 hours. The temperature was raised to 120° C., and the reaction was continued for 2 hours. The temperature was raised to 150° C. and vacuum was applied for 2.0 hours. The molecular weight of the obtained product was 250,000.

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Abstract

The invention provides a high-gloss and high temperature resistant silicon-acrylic polyurethane paint and method for preparation, which comprises using octamethylcyclotetrasiloxane (D4), vinylcyclote trasiloxane (D'4) as monomer, hydroxy silicone oil as end-capping agent, carrying out ring-opening polymerization at presence of alkaline catalyst, obtaining hydroyl-terminated polydimethyl siloxane, then subjecting the obtained obtaining hydroyl-terminated polydimethyl siloxane, methyl methacrylate, n-butyl acrylate and hydroxy-containing acrylate to free radical grafted copolymerization, obtaining organic fluorosilicone acrylate resin, and mixing the organic fluorosilicone acrylate resin with HDI trimer.

Description

technical field [0001] The invention relates to a high-gloss high-temperature-resistant silicon-acrylic polyurethane coating and a preparation method thereof. Background technique [0002] Acrylic polyurethane coating is a coating with good surface decoration and wear resistance, and it is widely used in architectural decoration and industrial products. This is a two-component coating, one component is a hydroxyl-containing polyacrylate resin, and the other component is an isocyanate prepolymer. From the actual use effect, the heat resistance of polyacrylate is not high when it is used as coating. Most isocyanate prepolymers currently use toluene diisocyanate (TDI) as a raw material, which is prone to yellowing and discoloration when used as a coating, which affects the decorative effect. [0003] Silicone polymer is a kind of semi-organic polymer with special structure and excellent performance. The main chain of its molecule is an inorganic structure of Si-O bond, and t...

Claims

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Application Information

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IPC IPC(8): C08G18/61C09D151/08C09D175/04
Inventor 王国建刘琳许乾慰
Owner TONGJI UNIV
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