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Method for preparing polyester modified organic silicon resin and coating containing the resin

A technology of polyester modification and silicone, applied in the direction of coating, etc., can solve the problems of high price and inconvenient construction, and achieve the effect of high pigment affinity, good adhesion and high heat resistance

Active Publication Date: 2013-04-03
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyester-modified silicone resin obtained by the above method must use aliphatic isocyanate as a curing agent to react and form a film, which has the disadvantages of inconvenient construction and high price.

Method used

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  • Method for preparing polyester modified organic silicon resin and coating containing the resin
  • Method for preparing polyester modified organic silicon resin and coating containing the resin
  • Method for preparing polyester modified organic silicon resin and coating containing the resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Synthesis of saturated polyester

[0040] a) Composition:

[0041] Polyols: 62.4g (0.6mol) of neopentyl glycol; 27g (0.3mol) of 2-methyl-1,3 propanediol; 13.4g (0.1mol) of trimethylolpropane;

[0042] Dibasic acid: 132.8g (0.8mol) of isophthalic acid;

[0043] Dimethylol alkyl carboxylic acid: dimethylol propionic acid 6.7g (0.05mol);

[0044] b) synthesis steps:

[0045] Add polyol and dimethylol alkyl carboxylic acid into a reactor equipped with heating, condensation and nitrogen protection, and raise the temperature to 160°C under nitrogen protection; then add dibasic acid and heat to 240°C at a heating rate of 20°C per hour , keep warm for 4h; finally cool down to room temperature to obtain 215g saturated polyester.

[0046] c) Properties of saturated polyester

[0047] The hydroxyl value of the saturated polyester was detected according to the method described in GB / T7193.2-1987, and the result was 80mgKOH / g. The weight average molecular weight of the satur...

Embodiment 2

[0076] 1) Synthesis of saturated polyester

[0077] a) Composition:

[0078] Polyols: 62.4g (0.6mol) of neopentyl glycol; 27g (0.3mol) of 2-methyl-1,3 propanediol; 13.4g (0.1mol) of trimethylolpropane;

[0079] Dibasic acid: 132.8g (0.8mol) of isophthalic acid;

[0080] Dimethylol alkyl carboxylic acid: dimethylol propionic acid 13.4g (0.1mol);

[0081] b) synthesis steps:

[0082] Add polyol and dimethylol alkyl carboxylic acid into a reactor equipped with heating, condensation and nitrogen protection, and raise the temperature to 160°C under nitrogen protection; then add dibasic acid and heat to 240°C at a heating rate of 20°C per hour , keep warm for 4h; finally cool down to room temperature to obtain 213g of saturated polyester.

[0083] c) Properties of saturated polyester

[0084] The hydroxyl value of the saturated polyester was detected according to the method described in GB / T7193.2-1987, and the result was 120mgKOH / g. The weight average molecular weight of the s...

Embodiment 3

[0108] 1) Synthesis of saturated polyester

[0109] a) Composition:

[0110] Polyols: 62.4g (0.6mol) of neopentyl glycol; 27g (0.3mol) of 2-methyl-1,3 propanediol; 13.4g (0.1mol) of trimethylolpropane;

[0111] Dibasic acid: 99.6g (0.6mol) of isophthalic acid; 49.8g (0.3mol) of terephthalic acid

[0112] Dimethylol alkyl carboxylic acid: dimethylol propionic acid 6.7g (0.05mol); dimethylol acetic acid 12g (0.01mol); dimethylol butyric acid 1.48g (0.01mol);

[0113] b) synthesis steps:

[0114] Add polyol and dimethylol alkyl carboxylic acid into a reactor equipped with heating, condensation and nitrogen protection, and raise the temperature to 160°C under nitrogen protection; then add dibasic acid and heat to 240°C at a heating rate of 20°C per hour , keep warm for 4h; finally cool to room temperature to obtain 200g saturated polyester.

[0115] c) Properties of saturated polyester

[0116] The hydroxyl value of the saturated polyester was detected according to the method...

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Abstract

The present invention relates to a method for preparing polyester modified organic silicon resin which is prepared from 45-75 wt% of saturated polyester, 1-10 wt% of 3-glycidyl ether oxygen propyl trimethoxy silane and 20-45 wt% of organic silicon resin by reacting. The acid value of the saturated polyester is within a range of 60 to 120 mgKOH / g, and the weight-average molecular weight of the saturated polyester is within a range of 2000 to 6000. The weight-average molecular weight of an intermediate of the organic silicon resin is within a range of 800 to 2000, the content of alkoxy of the organic silicon resin is within a range of 2.5 to 15%, and the content of hydroxyl of the organic silicon resin is within a range of 3 to 20%. By combining with advantages of saturated polyester and organic silicon resin, the method has advantages of excellent heat resistant quality, good metal adhesion, low surface energy, excellent boiling resistant quality and acid-alkali resistant quality, and good temperature variation resistant quality. The polyester modified organic silicon resin prepared by the method can be used for preparing a high temperature resistant coating with low surface energy.

Description

technical field [0001] The invention relates to the field of organic macromolecular compounds, and relates to a macromolecular compound obtained by reacting only silicon and oxygen, in particular to an organosilicon resin. Background technique [0002] Silicone resin has a -Si-O-Si- structure, which shows excellent properties such as weather resistance, heat resistance, stain resistance and chemical stability. However, pure silicone resin needs to be cured at high temperature, and the curing time is long, which is inconvenient for construction. At the same time, it has poor adhesion to metal materials, poor solvent resistance, low mechanical strength, and high price, so its use is limited to a certain extent. Commonly used other resins to modify it. Modification of silicone resins with other resins such as epoxies can improve the metal adhesion, hardness and mechanical properties of the resin. For example, Deng Mingshan et al. used bisphenol A epoxy resin to modify methylp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/445C08G63/60C09D183/10C09D7/12
Inventor 刘海兵
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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