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Method for preparing organosilicon modified acrylic resin

A technology of acrylic resin and silicone, which is applied in the field of preparation of acrylic resin, can solve the problems of low surface of silicone polymer, poor compatibility of acrylic resin, increase of surface roughness of paint film, etc., and achieve excellent aging resistance and excellent mechanical properties Performance, compatibility improvement effect

Active Publication Date: 2013-04-24
中山大桥化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the surface energy of silicone polymers is low, and the compatibility with highly polar acrylic resins is poor. Silicone-modified acrylic resins prepared by condensation method are prone to microphase separation after film formation, resulting in an increase in the surface roughness of the paint film. , not suitable for preparing high-gloss decorative paint films
However, silicone-modified acrylic resins are prepared by copolymerizing vinyl-containing small-molecule silicone monomers and acrylates. Due to the lack of highly stable Si-O bonds in the polymers, the improvement in weather resistance is not obvious.

Method used

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  • Method for preparing organosilicon modified acrylic resin
  • Method for preparing organosilicon modified acrylic resin
  • Method for preparing organosilicon modified acrylic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 10 parts of xylene and 70 parts of trimethylbenzene mixture in a four-necked flask equipped with a stirrer and a condenser, stir and raise the temperature to 140°C, then slowly add 80 parts of styrene and 20 parts of butyl acrylate dropwise , 30 parts of hydroxyethyl methacrylate, 10 parts of γ-methacryloxypropyl trimethoxysilane and 10 parts of benzoyl tert-butyl peroxide, and control the dropping time for about 3 hours, and then keep warm 2 hours. Then lower the temperature to 100°C, add 0.5 parts of dibutyltin dilaurate, and drop 50 parts of hydroxyl-terminated silicone oil within 0.5 hours, then keep it warm for 6 hours, cool down and discharge, and obtain silicone-modified acrylic resin A.

Embodiment 2

[0023] Put 40 parts of ethyl acetate and 40 parts of butyl acetate mixture into a four-necked flask equipped with a stirrer and a condenser, stir and raise the temperature to 80°C, then slowly add 30 parts of styrene, 45 parts of formaldehyde methyl acrylate, 20 parts butyl acrylate, 40 parts hydroxyethyl methacrylate, 5 parts tetramethyldivinyl disiloxane and 10 parts dibenzoyl peroxide, and the dropping time is controlled to be 3 hours About, and then keep warm for 4 hours. Then lower the temperature to 60°C, add 0.5 parts of hydrochloric acid, and dropwise add 50 parts of hydroxyl-terminated silicone oil within 0.5 hours, then keep it warm for 4 hours, add ammonia water for neutralization, cool down and discharge to obtain silicone-modified acrylic resin B.

Embodiment 3

[0025] Put 40 parts of xylene, 30 parts of butyl acetate and 10 parts of ethylene glycol monoethyl ether acetate mixture into a four-necked flask equipped with a stirrer and a condenser, stir and raise the temperature to 100°C, and then slowly drop Add 80 parts of styrene, 20 parts of butyl methacrylate, 30 parts of hydroxyethyl methacrylate, 5 parts of methylvinyldiethoxysilane and 10 parts of benzoyl tert-butyl peroxide, and add them dropwise The time is about 3 hours, and then keep warm for 3 hours. Then lower the temperature to 100°C, add 0.5 parts of tetraisopropyl titanate, and drop 50 parts of hydroxyl-terminated silicone resin within 0.5 hours, then keep it warm for 6 hours, cool down and discharge, and obtain silicone-modified acrylic acid Resin C.

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Abstract

The invention relates to a method for preparing organosilicon modified acrylic resin. An organosilicon unit is introduced into an acrylic polymer chain segment, and polyorganosiloxane is grafted to an acrylate chain segment through the organosilicon unit. The resin comprises raw materials such as a vinyl-containing micromolecular organosilicon monomer, styrene, a (methyl) acrylate monomer, hydroxyl-containing polyorganosiloxane, a solvent, an initiator and a catalyst, wherein the vinyl-containing micromolecular organosilicon monomer and the acrylate monomer are subjected to prepolymerization under the action of the initiator; and prepolymer and the hydroxyl-containing polyorganosiloxane are polymerized to form the resin under the action of the catalyst. The resin has high gloss and weather resistance and is suitable to be used as decorative finishing paint, and high mechanical property of the acrylic resin is kept.

Description

technical field [0001] The invention relates to a method for preparing an acrylic resin, in particular to a method for preparing an organosilicon-modified acrylic resin. Background technique [0002] Acrylic resin, as a coating film-forming substance, endows the paint film with excellent mechanical properties, high gloss, high transparency and other excellent properties, but its paint film also has low hardness, poor heat and light stability, easy to stain, and insufficient water resistance. shortcoming. The main chain of silicone polymer is Si-O bond, which has higher bond energy than C-C, so it has excellent weather resistance, heat resistance, cold resistance and water resistance. However, because the molecular chains of silicone polymers are relatively soft and the molecular chain forces are small, their mechanical strength is low and their adhesion to the substrate is poor. [0003] Modification of acrylic resin with silicone to obtain silicone-modified acrylic resin ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F212/08C08F220/14C08F220/18C08F220/28C08F230/08
Inventor 胡志标叶雨佐
Owner 中山大桥化工集团有限公司
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