Copolyester and preparation method thereof

A technology of copolyester and esterification, which is applied in the field of copolyester, can solve problems such as poor adhesion, less polar functional groups, and large pollution, and achieve the effects of convenient processing, strong adhesion, and high strength

Active Publication Date: 2021-03-19
YINGKOU KANGHUI PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the solvents and thinners in polyester paint are highly toxic benzene substances
[0004] The copolyesters of the prior art need to use organic solvents when preparing coatings, the pollution in the production process is relatively large, the use has a pungent smell and is harmful to the human body; and the copolyesters produced by the prior art have po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of copolyester, first with dibasic monomer A (mass ratio is the mixture of terephthalic acid and isophthalic acid of 2:1) and dibasic monomer B (ethylene glycol) as raw material in Under the action of catalyst (antimony trioxide), carry out esterification reaction to obtain esterification product, then add multi-unit monomer C (trimellitic anhydride) and multi-unit monomer D (trimethylolpropane) in the catalyst (trimethylol propane) to the esterification product Under the effect of diantimony), polycondensation reaction is carried out, and copolyester is obtained; Wherein, the mol ratio of binary monomer A, binary monomer B, multi-element monomer C and multi-element monomer D is 1:1:0.28:0.3, In the esterification reaction, the amount of catalyst used is 30ppm of the sum of the quality of binary monomer A and binary monomer B, and the amount of catalyst used for polycondensation that continues to be added after the end of the esterification r...

Embodiment 2

[0042] A kind of preparation method of copolyester, earlier with dibasic monomer A (mass ratio is the terephthalic acid and isophthalic acid of 1:1) and dibasic monomer B (1,4-butanediol) as The raw material undergoes esterification reaction under the action of catalyst (antimony acetate) to obtain an esterified product, and then add multiple monomer C (pyromellitic dianhydride) and multiple monomer D (trimethylolpropane) to the esterified product Polycondensation reaction is carried out under the action of catalyst (antimony acetate) to obtain copolyester; wherein, the molar ratio of binary monomer A, binary monomer B, multi-component monomer C and multi-component monomer D is 1:1:0.26 : 0.28, catalyst consumption is 50ppm of the sum of binary monomer A and binary monomer B quality in the esterification reaction, and the catalyst amount that continues to add for polycondensation reaction after esterification finishes is 120ppm of multi-component monomer C quality ;

[0043] ...

Embodiment 3

[0046] A kind of preparation method of copolyester, first take binary monomer A (adipic acid) and binary monomer B (diethylene glycol) as raw material to carry out esterification reaction under the effect of catalyst (ethylene glycol antimony) to obtain Esterification product, then add multi-unit monomer C (trimellitic anhydride) and multi-unit monomer D (trimethylolpropane) to the esterification product to carry out polycondensation reaction under the action of catalyst (ethylene glycol antimony) to obtain copolyester; Wherein, the molar ratio of binary monomer A, binary monomer B, multi-component monomer C and multi-component monomer D is 1:1.2:0.24:0.26, and the amount of catalyst used in the esterification reaction is binary monomer A and binary monomer 70ppm of the sum of the monomer B quality, the amount of catalyst for polycondensation reaction that continues to be added after the end of the esterification reaction is 150ppm of the multi-component monomer C quality;

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Abstract

The preparation method comprises the following steps: carrying out esterification reaction on a binary monomer A and a binary monomer B serving as raw materials to obtain an esterification product, and adding a polybasic monomer C into the esterification product or simultaneously adding the polybasic monomer C and a polybasic monomer D for polycondensation reaction to obtain copolyester; wherein the acid value of the copolyester is 30 to 70 mg KOH/g; dissolving the prepared copolyester in water under the conditions that the temperature is 65-90 DEG C and ammonia water and a cosolvent are added; wherein the cosolvent is more than one of isopropanol, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol methyl ether acetic ether,dimethylethanolamine and propylene glycol methyl ether. The copolyester prepared by the method disclosed by the invention can be dissolved in water under specific conditions to prepare the water-soluble copolyester coating, does not use an organic solvent, and has the advantages of environmental protection, no pollution, no harm to human bodies and the like; meanwhile, various polar groups are introduced, and hydroxyl and carboxyl can react with an isocyanate curing agent to form cross-linked network structure resin.

Description

technical field [0001] The invention belongs to the technical field of copolyester and relates to a copolyester and a preparation method thereof. Background technique [0002] In order to improve the surface properties of articles, physical or chemical methods are usually used to modify the surface. Among them, uniform coating of a layer of polyester coating on the surface is the most commonly used measure, such as furniture, steel surface paint, and film surface. coating etc. There are two types of coatings: solvent-based and water-based. Because solvent-based coatings have a greater impact on the environment, water-based coatings are the future development trend. [0003] The paint on the surface of furniture and steel is commonly used as unsaturated polyester paint, which is commonly known as "piano paint". paint. Polyester paint is composed of three components: main paint, diluent, and curing agent. The main agent is a styrene solution of unsaturated polyester, and th...

Claims

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Application Information

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IPC IPC(8): C08G63/127C08G63/20C08G63/668C08G63/672C08G63/60C08G63/137C08G63/52C08G63/688C09D167/02C09D167/06C09D167/00
CPCC08G63/127C08G63/20C08G63/668C08G63/672C08G63/60C08G63/137C08G63/52C08G63/6886C09D167/02C09D167/025C09D167/06C09D167/00
Inventor 鞠金虎刘建李平
Owner YINGKOU KANGHUI PETROCHEM
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