High-Tg high-impact-resistance polyester resin for dual-curing powder coating as well as preparation method and application of high-Tg high-impact-resistance polyester resin
A technology of powder coating and polyester resin, which is applied in the direction of powder coating, polyester coating, coating, etc., can solve the problem of less high-toughness polyester resin, improve adhesion, improve storage stability, and improve impact resistance Effect
Active Publication Date: 2022-02-01
新中法高分子材料股份有限公司
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Embodiment A-F
[0034] The preparation method of embodiment A-F comprises the steps:
[0035] Step 1, prepare raw materials according to the following mass percentages: 24.0-44.0% dihydric alcohol, 0.4-2.0% polyol, 45.0-55.0% dibasic acid, 6.0-12.0% capping agent A, 0.2-5% capping agent B , 0.05-0.15% esterification catalyst, 0.5-1.5% antioxidant, 0.02-0.4% curing accelerator; end-blocking agent A includes: one or a mixture of two in isophthalic acid and adipic acid; Terminal agent B is bisphenol A type epoxy resin with epoxy equivalent between 1500-4000;
[0036] Step 2: In the reaction kettle, add diol and polyol, heat to 80-100°C, then add polybasic acid and esterification catalyst, under the protection of nitrogen atmosphere, rapidly raise the temperature to 170-180°C, esterification water is formed and Distillation; then gradually increase the temperature to 240°C at a rate of 6-8°C / hour, and keep it at 240°C until the material is clarified and sampled for testing. When the acid value r...
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The invention discloses Tg high-impact-resistance polyester resin for a dual-curing powder coating as well as a preparation method and application of the Tg high-impact-resistance polyester resin. The polyester resin is prepared from the following components in percentage by mass: 24.0 to 44.0 percent of dihydric alcohol, 0.4 to 2.0 percent of polyhydric alcohol, 45.0 to 55.0 percent of binary acid, 6.0 to 12.0 percent of end-capping reagent A, 0.2 to 5 percent of end-capping reagent B, 0.05 to 0.15 percent of esterification catalyst, 0.5 to 1.5 percent of antioxidant and 0.02 to 0.4 percent of curing accelerator. The end-capping reagent A comprises one or a mixture of two of isophthalic acid and adipic acid; and the end-capping reagent B is bisphenol A type epoxy resin of which the epoxy equivalent is between 1500 and 4000. According to the invention, high-equivalent bisphenol A type epoxy resin is selected as the end-capping reagent B, so that the obtained polyester resin has higher glass transition temperature while having good flexibility, and the storage stability is improved; and a film of the prepared powder coating has excellent impact resistance and weather resistance.
Description
technical field [0001] The invention relates to the field of material chemistry, in particular to a polyester resin with high Tg impact resistance for dual-curable powder coatings and a preparation method and application thereof. Background technique [0002] Powder coating is a solvent-free and environmentally friendly coating, which is widely used in the fields of building materials and home decoration. It has the advantages of simple preparation, efficient coating, economical and environmental protection, and superior performance. The high-toughness powder coating can better meet the current technical requirements of bending resistance, impact resistance, aging resistance and other technical requirements of the coating on the metal surface after coating. , automotive machinery parts and other product fields have broad prospects for industrial application. As an important part of powder coatings, polyester resin is the key to improving the high impact resistance of polyes...
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IPC IPC(8): C08G63/20C08G63/91C09D167/02C09D5/03
CPCC08G63/20C08G63/916C09D167/02C09D5/03Y02P20/10
Inventor 王慧丽廖萍邵妃董亿政沈小明
Owner 新中法高分子材料股份有限公司