A straight-chain saturated polyester resin, a method for preparing the same, and an application thereof

By designing linear saturated polyester resins with a number average molecular weight of 5000-8000, a glass transition temperature of 10-40℃, and a solid content of 55-65%, the problem of coating switching on different substrates for household appliances has been solved, achieving efficient and low-energy production and excellent resistance to boiling water and chemicals.

CN122103536APending Publication Date: 2026-05-29NIPPON PAINT IND COATINGS SHANGHAI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NIPPON PAINT IND COATINGS SHANGHAI
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the existing technology, the coatings for home appliances need to be switched on the production line according to different substrates and products, resulting in low production efficiency and difficulty in meeting the coating requirements of general-processed color-coated steel sheets and high-processed color-coated steel sheets at the same time. In addition, the coating coverage, cross-linking curing degree and chemical resistance of the coatings are insufficient.

Method used

Using linear saturated polyester resin with a number average molecular weight of 5000-8000, a glass transition temperature of 10-40℃, and a solid content of 55-65%, the primer prepared through monomer formulation design can simultaneously meet the processing requirements of general-processed and high-processed color-coated steel sheets. When used with a general-purpose topcoat, it exhibits excellent processing performance, water resistance, and chemical resistance.

Benefits of technology

It achieves high coating rate and stability of primer on different substrates, improves production line efficiency, reduces energy consumption and carbon emissions, and has excellent salt spray resistance and chemical resistance.

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Abstract

The present application relates to a kind of linear saturated polyester resin, it is by dihydric alcohol and diacid copolymerization, dihydric alcohol 20-40% by mass percentage content of the linear saturated polyester resin, wherein C5-C 10 Linear aliphatic diol is 0-6% by mass percentage content of the linear saturated polyester resin;The diacid is 24-36% by mass percentage content of the linear saturated polyester resin, wherein C5-C 10 Linear aliphatic diacid is 5-9% by mass percentage content of the linear saturated polyester resin;The number average molecular weight of the linear saturated polyester resin is 5000-8000, glass transition temperature is 10-40 ℃, solid content is 55-65%, and hydroxyl value is 5-20 mgKOH / g.The primer prepared based on the linear saturated polyester resin can meet the processing requirements of general processing color coated plate and high processing color coated plate at the same time, and has higher coating rate, and has excellent processing performance, boiling water resistance, chemical resistance and salt spray resistance after being matched with general topcoat.
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