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A water-based polyester copolymer and preparation method and application thereof

A water-based polyester and copolymer technology, applied in the field of coatings, can solve the problems of solvent resistance decline, affecting the molecular weight and distribution of polyester, affecting the degree of curing of coatings, etc., to achieve the effect of achieving a comprehensive performance balance

Active Publication Date: 2021-04-13
GUANGZHOU KINTE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the type and content of the hydrophilic group of the polyester polymer not only affect the molecular weight and distribution of the polyester during the polycondensation process, but also the reaction residue of the group further affects the degree of curing of the coating, resulting in the processability and retort resistance of the cured coating. (boiling water resistance), solvent resistance and other comprehensive performance decline

Method used

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  • A water-based polyester copolymer and preparation method and application thereof
  • A water-based polyester copolymer and preparation method and application thereof
  • A water-based polyester copolymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The present embodiment provides a kind of environmental protection catalyst CATA1, and its preparation method comprises the following steps:

[0057] (1) A total of 3.15 g of butyl titanate and n-propyl titanate composition was placed in 22 mL of hydrochloric acid aqueous solution (0.025 mol / L) for hydrolysis to obtain Sol A; 3.92 g of propyl titanate was placed in 23 mL containing Hydrolysis of ethanol in hydrochloric acid aqueous solution (0.025mol / L) obtains sol B; Sol A is mixed with sol B to obtain sol C; wherein the molar ratio of titanium element and silicon element in sol C is 4:6;

[0058] (2) Slowly add sol C dropwise to the aqueous solution of amine compounds (composition of (R)-spirocyclic diamine and caprolactam total 2.8g, water 143g), obtain white flocculent precipitate, use deionized water repeatedly Centrifugal washing to free of chloride ions, drying at 65°C to constant weight, and then crushing treatment to obtain an environmentally friendly catalyst ...

Embodiment 2

[0060] The present embodiment provides a kind of environmental protection catalyst CATA2, and its preparation method comprises the following steps:

[0061] (1) A total of 4.85 g of the composition of butyl titanate and isopropyl titanate was placed in 26 mL of aqueous hydrochloric acid (0.025 mol / L) for hydrolysis to obtain Sol A; 5.1 g of tetraethyl orthosilicate was placed in 23 mL Hydrolysis in ethanol-containing hydrochloric acid aqueous solution (0.025mol / L) to obtain Sol B; Sol A was mixed with Sol B to obtain Sol C; wherein the molar ratio of titanium and silicon in Sol C was 6:4;

[0062] (2) Slowly add sol C dropwise to an aqueous solution of amine compounds ((R)-spirocyclic diamine, a composition of caprolactam and N,N-dimethylamide totaling 3.56g, water 158g) to obtain a white floc Centrifuge and wash repeatedly with deionized water until there is no chloride ion, dry at 89°C to constant weight, and then pulverize to obtain an environmentally friendly catalyst CATA...

Embodiment 3-5

[0067] Embodiment 3-5 provides a kind of aqueous polyester copolymer respectively, and its specific preparation method comprises the following steps (wherein the raw material composition and consumption in each step are shown in Table 1):

[0068] (1) In the reaction still equipped with agitator, thermometer, reflux condenser and nitrogen gas, part of spirocyclic glycol, part of environmental protection catalyst, aromatic polybasic acid, sulfonic acid group containing dibasic acid (ester) and Add other polyols into the reaction vessel together, and react at a temperature of 220-240°C under the condition of nitrogen as a protective gas, and keep the temperature for 1-3 hours until the acid value of the system drops below 20mgKOH / g.

[0069] (2) Under the temperature of keeping step (1), add remaining spiro diol and part of fatty acid to react, and react until the acid value of the system is reduced to below 25mgKOH / g;

[0070] (3) Cool down to 210-230°C, add alicyclic acid and ...

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Abstract

The invention belongs to the technical field of coatings, and discloses awater-based polyester copolymer and a preparation method and application thereof.The water-based polyester copolymer is mainly prepared from the following components: polyol, polyacid and an environmentally friendly catalyst. The polyol includes spiro diols and diols with no less than 5 carbon atoms in the main chain. The polyacid includes aromatic polyacid, sulfonic acid group-containing dibasic acid (ester), fatty acid and alicyclic acid; the environmental protection catalyst is prepared by complexing reaction of titanate, silicate and amine compound; 70-100% of the total carboxyl end groups in the water-based polyester copolymer are derived from fatty acid and / or alicyclic acid end carboxyl groups. After the water-based polyester copolymer is used in the preparation of water-based coatings, the cured coating has excellent processability, boiling water resistance and stability.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a water-based polyester copolymer and its preparation method and application. Background technique [0002] Polyester resin is a kind of characteristic with plump appearance, good adhesion, good flexibility and good mechanical properties. It can be used as the main film-forming material in water-based thermosetting compositions, and is widely used in coatings and inks, adhesive seals, fibers and films. materials for processing and other application areas. For high molecular weight polyester and its cured coating, it can maintain outstanding processability and adhesion advantages. However, for high molecular weight polyesters used in water-based coatings, especially for high glass transition temperature (Tg) systems, it is difficult for common high molecular weight polyesters to achieve ideal water dispersibility and storage stability. [0003] In the existing technology, polyc...

Claims

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Application Information

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IPC IPC(8): C08G63/87C08G63/85C08G63/688C09D167/02
CPCC08G63/85C08G63/87C08G63/6886C09D167/02C08G63/199C08G2150/00
Inventor 陆均杰李勇谢静刘亮顾宇昕张捷
Owner GUANGZHOU KINTE IND
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