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Heterocycle modified flexible hydrolysis-resistant polyester and preparation method thereof

A hydrolysis-resistant and flexible technology, applied in polyester coatings, coatings, etc., can solve the problems of polyester flexibility decline, limited raw material types, high cost and other problems

Active Publication Date: 2018-05-01
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned branching agent components are randomly distributed in the resin structure, resulting in poor reproducibility of the resin performance, and more seriously, insufficient regularity of the formed branched structure, which reduces the flexibility of the polyester. The decrease in flexibility after the coating is cured is more obvious
[0006] Polyester with a high degree of branching can improve its hydrolysis resistance, but the high amount of branching agent will make it difficult to mix and cause uneven reaction, and unreasonable branching structure will affect product performance
U.S. Patents US6740402, US5378537, etc. use carbodiimide to improve the hydrolysis resistance of polyester, but carbodiimide can reduce the stability of aqueous dispersions and the cost is high and it is difficult for large-scale industrial application
Chinese patents CN104629034A and CN104629022A propose to control the ratio of primary alcohol-carboxylate bond and alicyclic alcohol-carboxylate bond in the polyester structure to improve the hydrolysis resistance of polyester, but this type of method strictly limits the raw materials for preparing polyester Variety and high cost, it is difficult to meet the comprehensive performance of industrial coatings, especially the requirements of flexibility
[0007] The balance of flexibility and hydrolysis resistance, as well as the improvement of comprehensive properties such as solvent resistance and water boiling resistance, are the technical bottlenecks of polyester resin research for water-based industrial coatings. The existing polyesters on the market cannot effectively solve the above problems. The technical problems will not be conducive to the promotion and application of environmentally friendly industrial coatings, and the realization of green environmental protection and sustainable development of coatings

Method used

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  • Heterocycle modified flexible hydrolysis-resistant polyester and preparation method thereof
  • Heterocycle modified flexible hydrolysis-resistant polyester and preparation method thereof
  • Heterocycle modified flexible hydrolysis-resistant polyester and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0084] The heterocyclic modified flexible hydrolysis-resistant polyester provided in this embodiment is mainly prepared by the following method: selecting component A, component B and branched component C in the presence of a catalyst for esterification polycondensation reaction, and then In the later stage of the reaction, component D is added for reaction to obtain a flexible hydrolysis-resistant polyester with a six-membered branched island structure, wherein the proportion of the six-membered branched island structure in the flexible polyester structure is less than or equal to 13%.

[0085] Component A is selected from difunctional carboxylic acids. The secondary or tertiary carboxyl groups in the difunctional carboxylic acid account for no more than 20% of the total moles of the carboxylic acid. Component A is a dibasic acid, specifically 1,8-suberic acid With terephthalic acid.

[0086] Component B is selected from bifunctional alcohols. The primary hydroxyl groups in the bi...

Embodiment 2

[0097] The heterocyclic modified flexible hydrolysis-resistant polyester provided in this embodiment is mainly prepared by the following method: selecting component A, component B and branched component C in the presence of a catalyst for esterification polycondensation reaction, and then In the later stage of the reaction, component D is added for reaction to obtain a flexible hydrolysis-resistant polyester with a six-membered branched island structure, wherein the proportion of the six-membered branched island structure in the flexible polyester structure is ≤7%.

[0098] Component A is selected from difunctional carboxylic acids. The secondary or tertiary carboxyl groups in the difunctional carboxylic acid account for no more than 20% of the total moles of carboxylic acid. Component A is a dibasic acid, specifically sebacic acid and isophthalic acid. Formic acid and 1,4-cyclohexanedicarboxylic acid.

[0099] Component B is selected from bifunctional alcohols. The primary hydroxy...

Embodiment 3

[0109] The heterocyclic modified flexible hydrolysis-resistant polyester provided in this embodiment is mainly prepared by the following method: selecting component A, component B and branched component C in the presence of a catalyst for esterification polycondensation reaction, and then In the late stage of the reaction, the component D is added to react to obtain a flexible hydrolysis-resistant polyester with a six-membered branched island structure, wherein the proportion of the six-membered branched island structure in the flexible polyester structure is ≤2%.

[0110] Component A is selected from difunctional carboxylic acids. The secondary or tertiary carboxyl groups in the difunctional carboxylic acid account for no more than 20% of the total moles of carboxylic acid. Component A is a dibasic acid, specifically 1,6-adipic acid And terephthalic acid.

[0111] Component B is selected from bifunctional alcohols. The primary hydroxyl groups in the bifunctional alcohols account f...

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Abstract

The invention discloses a heterocycle modified flexible hydrolysis-resistant polyester. The heterocycle modified flexible hydrolysis-resistant polyester has a number-average molecular weight of 3500 to 12000, a glass transition temperature of minus 5 to 45 DEG C, a melt viscosity of 2000 to 8000 mPa*s at 200 DEG C, an acid value of 10 to 40 mgKOH / g, and a hydroxyl value of 20 to 250 mgKOH / g. The heterocycle modified flexible hydrolysis-resistant polyester is prepared mainly through the following method: selecting a component A, a component B and a branching component C, carrying out an esterification condensation polymerization reaction in the presence of a catalyst, then adding a component D in the later period of the reaction, and carrying out a reaction so as to obtain a flexible hydrolysis-resistant polyester with a six-member branched island structure. The flexible hydrolysis-resistant polyester provided by the invention has a six-member branched island structure and unique structural regularity, can achieve excellent flexibility and hydrolysis resistance, and comprehensively improves comprehensive performances like solvent resistance, heat resistance, water boiling resistanceand scratch resistance. The invention also discloses a preparation method for the above-mentioned heterocycle modified flexible hydrolysis-resistant polyester.

Description

Technical field [0001] The invention belongs to the technical field of flexible resins, and specifically relates to a heterocyclic modified flexible hydrolysis resistant polyester and a preparation method thereof. Background technique [0002] Polyester resins for industrial coatings are currently solvent-based, especially in coil coatings, architectural aluminum coatings and ink coatings. Water-based industrial coatings and resins are the trend of environmental protection development. [0003] Polyester resin meets the performance requirements of excellent flexibility and adhesion of industrial coatings cured coatings. Linear polyester has high flexibility, but when curing agents such as amino resin or blocked isocyanate are used for cross-linking reaction, the solvent resistance, hardness and scratch resistance of the linear polyester cured coating obtained are not ideal. [0004] Water-based coatings use water as a diluent, which requires polyester to have excellent hydrolysis r...

Claims

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Application Information

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IPC IPC(8): C08G63/685C08J3/09C09D167/02C09D167/04
CPCC08G63/6852C08G63/6856C08J3/095C08J2367/02C09D167/02C09D167/04
Inventor 陆均杰许振阳陈唯顾宇昕李勇梁志健
Owner GUANGZHOU KINTE IND
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