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Terminal hydroxy-carboxy bifunctional saturated polyester resin and preparation method thereof

A technology of polyester resin and bifunctional group, which is applied in the field of hydroxyl-terminated carboxyl bifunctional saturated polyester resin and its preparation, and can solve problems such as low weather resistance, difficulty in accurately controlling product parameters, and inapplicability of polyester resin.

Inactive Publication Date: 2018-05-29
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to accurately control product parameters in the actual production process, and the polyester resin described in this method is not suitable for the field of matting
CN101205293A and CN101205293A disclose a kind of hybrid polyester resin for low light powder coating and its preparation method, it reacts with epoxy resin to prepare powder coating, and the weather resistance is low

Method used

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  • Terminal hydroxy-carboxy bifunctional saturated polyester resin and preparation method thereof
  • Terminal hydroxy-carboxy bifunctional saturated polyester resin and preparation method thereof
  • Terminal hydroxy-carboxy bifunctional saturated polyester resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method step of polyester resin is as follows:

[0027] A. Put polyol and branching agent in the reaction kettle, heat and melt in nitrogen atmosphere, then add aromatic polyacid and esterification catalyst, carry out esterification and polycondensation reaction at 245°C until the acid value of the reaction intermediate product is 10mgKOH / g;

[0028] B. Add an acidolysis agent to carry out polycondensation and end-capping at 240°C. When the acid value reaches 55mgKOH / g, cool down to 235°C and then vacuum polycondensate to form a polyester resin intermediate. The acid value of the polyester resin intermediate is 46mgKOH / g ; The degree of vacuum of the vacuum is -0.1MPa;

[0029] C, the alcoholysis agent is dropped into the reactor and maintained to an acid value of 41mgKOH / g, and a hydroxyl value of 17.9mgKOH / g;

[0030] D. Cool down to 200°C, put in curing accelerator and antioxidant, and keep for 20 minutes to obtain polyester resin.

Embodiment 2

[0032] The preparation method step of polyester resin is as follows:

[0033] A. Put polyols and branching agents in a reaction kettle, heat and melt them in a nitrogen atmosphere, then add aromatic polyacids and esterification catalysts, and carry out esterification and polycondensation at 235°C until the acid value of the reaction intermediate product is 13mgKOH / g;

[0034] B. Add an acidolysis agent to carry out polycondensation and end-capping at 235°C. When the acid value reaches 60mgKOH / g, cool down to 230°C and then vacuum polycondensate to form a polyester resin intermediate. The acid value of the polyester resin intermediate is 48mgKOH / g ; The degree of vacuum of the vacuum is -0.1MPa;

[0035] C, the alcoholysis agent is dropped into the reactor and maintained to an acid value of 41.8mgKOH / g, and a hydroxyl value of 20.1mgKOH / g;

[0036] D. Cool down to 190°C, put in curing accelerator and antioxidant, and keep for 25 minutes to obtain polyester resin.

Embodiment 3

[0038] The preparation method step of polyester resin is as follows:

[0039] A. Put polyols and branching agents in a reaction kettle, heat and melt them in a nitrogen atmosphere, then add aromatic polyacids and esterification catalysts, and carry out esterification and polycondensation at 250°C until the acid value of the reaction intermediate product is 7mgKOH / g;

[0040] B. Add an acidolysis agent to carry out polycondensation and end-capping at 248°C. When the acid value reaches 62mgKOH / g, cool down to 240°C and then vacuum polycondensate to form a polyester resin intermediate. The acid value of the polyester resin intermediate is 52mgKOH / g ; The degree of vacuum of the vacuum is -0.1MPa;

[0041] C, the alcoholysis agent is dropped into the reactor and maintained to an acid value of 40.9mgKOH / g, and a hydroxyl value of 19.5mgKOH / g;

[0042] D. Cool down to 190°C, add curing accelerator and antioxidant, and keep for 10 minutes to obtain polyester resin.

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Abstract

The invention discloses terminal hydroxy-carboxy bifunctional saturated polyester resin suitable for matting and transfer printing powder coatings and a preparation method of the polyester resin. Thepolyester resin provided by the invention is suitable for the matting and transfer printing powder coatings, the polyester resin has a proper glass-transition temperature and color lustre, and the prepared powder coating can be compounded with a matting agent to reach the gloss of 30 degrees, can be used in the field of thermal transfer, and has the advantages that the patterns are clear, paper iseasy to tear, and no glue imprints exist.

Description

technical field [0001] The invention belongs to the technical field of resins, and in particular relates to a hydroxyl-terminated-carboxyl bifunctional saturated polyester resin and a preparation method thereof. Background technique [0002] Existing polyester resins suitable for thermal transfer or matting powder coatings such as CN101704945B specifically relate to a polyester resin for hybrid thermal transfer powder coatings and a preparation method thereof. A large amount of ethylene glycol, diethylene glycol, and Monomers with poor weather resistance such as alcohol are not conducive to market promotion. CN106633012A discloses a method for preparing a resin for thermal transfer powder coatings. It first prepares a hydroxyl-terminated polyester resin and then acidifies it to realize a hydroxyl-carboxyl-terminated polyester resin, which is used in the field of thermal transfer printing. It is difficult to accurately control product parameters in the actual production proc...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C09D175/06C09D5/03C09D7/48
CPCC08G63/20C08G63/78C09D5/03C09D5/033C09D175/06
Inventor 周韦明刘志坚
Owner ANHUI SHENJIAN NEW MATERIALS
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