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Method for preparing polyester resin for super-weatherability outdoor powder coating

A polyester resin and powder coating technology, used in powder coatings, polyester coatings, coatings, etc., can solve the problem that long-term weather resistance is difficult to meet high standard requirements, and achieve high-gloss outdoor weather resistance and excellent outdoor weather resistance. Effect

Active Publication Date: 2013-11-06
YANGZHOU XINBAO RESIN
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AI Technical Summary

Problems solved by technology

[0002] When the existing powder coating made of polyester resin is used for spraying on objects used outdoors, under natural conditions, the general weather resistance is difficult to meet the high standard requirements. In the artificial weather aging resistance test, it can only reach 800h Qualified, no powdering, foaming, cracking, peeling and other abnormal phenomena

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] 1. Weighing (parts by weight):

[0013] Weigh 35-45 parts of neopentyl glycol, 1-3 parts of trimethylolpropane, 10-20 parts of terephthalic acid, 50-70 parts of isophthalic acid, 0.2-0.5 parts of monobutyltin oxide, 1-3 parts of triphenylphosphine.

[0014] 2. Preparation method:

[0015] 1. Raise the temperature of the reactor to 80°C, and then put in neopentyl glycol, terephthalic acid, trimethylolpropane and monobutyltin oxide;

[0016] 2. Raise the temperature of the reactor to 240°C at a heating rate of 2-3°C / 15 minutes, and react at 240°C for 100-120 minutes;

[0017] 3. After detecting that the acid value of the resin in the reactor reaches the standard, put in isophthalic acid and react at 240°C for 120-180 minutes;

[0018] 4. After detecting that the acid value of the resin reaches the standard, carry out the polycondensation reaction under a vacuum of 0.090-0.095mPa for 180-240 minutes;

[0019] 5. After detecting that the acid value of the resin reaches ...

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Abstract

The invention relates to a method for preparing a polyester resin for super-weatherability outdoor powder coating, belonging to the technical field of the production of outdoor powder coating, in particular to the technical field of the processing process of the polyester resin used for producing coating. A polyalcohol and a polyacid condense, and water produced from reaction is removed to guarantee the continuous esterification, thus the polymer polyester resin with a certain degree of polymerization is obtained. The polyester resin produced by adopting the method is used for producing the outdoor powder coating and can ensure that the surface of the product has high gloss and superior outdoor weatherability. The artificial weathering aging resistance test proves that the polyester resin is qualified and can resist the weathering aging for 1,600h.

Description

technical field [0001] The invention relates to the technical field of outdoor powder paint production, in particular to the technical field of polyester resin processing technology for producing paint. Background technique [0002] When the existing powder coating made of polyester resin is used for spraying on objects used outdoors, under natural conditions, the general weather resistance is difficult to meet the high standard requirements. In the artificial weather aging resistance test, it can only reach 800h Qualified, no powdering, foaming, cracking, peeling and other abnormal phenomena. Contents of the invention [0003] The purpose of the present invention is to propose a method for preparing polyester resin that can be used to produce outdoor powder coatings with strong weather resistance. [0004] The present invention comprises the following steps: [0005] 1) Raise the temperature of the reactor to 80°C, and then put in neopentyl glycol, terephthalic acid, tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/20C08G63/78C09D167/02C09D5/03
Inventor 张爱东葛铁军
Owner YANGZHOU XINBAO RESIN
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