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A preparation method of modified polyester and coating containing the modified polyester

A technology for modifying polyester and coatings, applied in coatings and other directions, can solve problems such as difficult handling, and achieve the effects of high glass transition temperature, improved product performance, and good adhesion

Active Publication Date: 2021-08-10
中瀚新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Epoxy-phenolic resin systems, due to the possible migration of bisphenol A, a substance that may affect health, are now largely restricted for use in cans.
However, vinyl resin has many problems in its adhesion to metal and the introduction of difficult-to-handle substances during the preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of modified polyester:

[0017] 5.2kg 2-methylene-4-phenyl-1,3-dioxolane, 3.9kg butyl methacrylate, 10.1kg lauryl methacrylate, 0.4kg divinylbenzene, and 2.5g initiator The agent azobisisobutyronitrile was dissolved in 20L of toluene, added into the reaction kettle, mixed evenly, and then heated to 60-70°C for 2 hours under the protection of nitrogen. After being purified by precipitation with n-hexane, the modified polyester was obtained by vacuum drying.

Embodiment 2

[0019] Preparation of modified polyester:

[0020] 6.6kg 2-methylene-4-phenyl-1,3-dioxolane, 4.5kg butyl methacrylate, 6kg lauryl acrylate, 0.65kg divinylbenzene, and 2.8g initiator azo Dissolve diisobutyronitrile in 20L of toluene, add it into the reaction kettle, mix well, and then raise the temperature to 60-70°C for 2 hours under the protection of nitrogen. After being purified by precipitation with n-hexane, the modified polyester was obtained by vacuum drying.

Embodiment 3

[0022] Preparation of modified polyester:

[0023] 8.1kg 2-methylene-4-phenyl-1,3-dioxolane, 6kg isobornyl acrylate, 3.4kg lauryl methacrylate, 0.96kg divinylbenzene, and 2.7g initiator Dissolve azobisisobutyronitrile in 20L of toluene, add it into the reaction kettle, mix well, and then raise the temperature to 60-70°C for 2 hours under the protection of nitrogen. After being purified by precipitation with n-hexane, the modified polyester was obtained by vacuum drying.

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Abstract

The present invention provides a kind of preparation method of modified polyester, comprising the following steps: by 2-methylene-4-phenyl-1,3-dioxolane and divinylbenzene, and other acrylic monomers Prepared by free radical copolymerization, the 2-methylene-4-phenyl-1,3-dioxolane accounts for 30-60% of the total molar content of the feed monomers, and divinylbenzene accounts for 30-60% of the total molar content of the feed monomers. 2‑10% of the molar content. The beneficial effects of the present invention are reflected in that the modified polyester main chain prepared by the method contains many ester bond structures, which can have good adhesion to metal substrates, and at the same time, there are more benzene rings next to the ester bonds, which can be very good Protect the ester bond. The glass transition temperature of the resin prepared by the method is high, and the strength of the resin is improved. The acrylic monomer part can provide high acid resistance, while the introduction of divinylbenzene provides part of the rigid branched structure, which further improves the performance of the final product.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a preparation method of modified polyester and a coating containing the modified polyester. Background technique [0002] With the gradual improvement of people's living standards, more and more people pursue a high-quality life and pay special attention to food safety issues. Therefore, today's food safety has naturally become a worldwide challenge and a topic of public health concern. [0003] At present, the inner coating of metal cans for food in my country is mainly epoxy resin and organic sol resin, which are often used to protect metal cans from the corrosion of the contents, which can prevent heavy metals in metal cans from migrating to food and increase the shelf life. Among them, the two most common materials are epoxy-phenolic resin and vinyl organosol resin. Epoxy-phenolic resin systems, due to the possible migration of bisphenol A, a substance that affe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F212/36C08F220/24C09D133/10C09D133/08
CPCC08F220/18C09D133/08C09D133/10C09D133/16
Inventor 宁珅许峰付静童军
Owner 中瀚新材料科技有限公司