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Modified epoxy resin and preparation method

An epoxy resin and modified technology, applied in the field of powder coatings, can solve the problems of poor mechanical properties and chemical resistance, and achieve the effects of good mechanical properties, simple preparation method and good chemical resistance.

Inactive Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on this, it is necessary to address the problems of poor mechanical properties and chemical resistance of traditional polyester epoxy powder coatings, and provide a modified epoxy resin with good mechanical properties and chemical resistance

Method used

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  • Modified epoxy resin and preparation method
  • Modified epoxy resin and preparation method

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preparation example Construction

[0033] see figure 1 , a preparation method of modified epoxy resin, comprising the following steps:

[0034] S110. In a nitrogen atmosphere, heat 7-8.5 parts by mass of epoxy resin, stir and dissolve to obtain a first reaction solution.

[0035] Wherein, the epoxy resin is bisphenol A type epoxy resin.

[0036] Specifically, in the step of obtaining the first reaction solution after heating 7-8.5 parts by mass of epoxy resin with stirring and dissolving, the heating temperature is 110°C-150°C.

[0037] Preferably, in the step of obtaining the first reaction liquid after heating 7-8.5 parts by mass of epoxy resin with stirring and dissolving, the heating temperature is 120°C-130°C.

[0038] It can be understood that step S110 may also include a preheating step, that is, first heating to 85° C. to 95° C., and then introducing nitrogen gas. In a nitrogen atmosphere, heat 7 to 8.5 parts by mass of epoxy resin and stir to dissolve Afterwards, the first reaction solution is obtai...

Embodiment 1

[0050] In a nitrogen atmosphere, heat 400g of bisphenol A epoxy resin to 110°C, stir and dissolve, add 100g of saturated polyester resin, and continue stirring for 1.5 hours to obtain a modified epoxy resin.

[0051]The epoxy equivalent of the modified epoxy resin measured by the hydrochloric acid-acetone method is 951g / eq, and the softening point of the modified epoxy resin measured by the FP90 thermal system analysis method is 92.1°C.

Embodiment 2

[0053] In a nitrogen atmosphere, 375g of bisphenol A epoxy resin was heated to 120°C, stirred and dissolved, then 125g of saturated polyester resin was added, and the reaction was continued for 2 hours to obtain a modified epoxy resin.

[0054] The epoxy equivalent of the modified epoxy resin measured by the hydrochloric acid-acetone method is 989g / eq, and the softening point of the modified epoxy resin measured by the FP90 thermal system analysis method is 94.4°C.

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Abstract

The present invention provides a modified epoxy resin prepared from the following raw materials in parts by mass: 1.5-3 parts of a saturated polyester resin and 7-8.5 parts of an epoxy resin. The modified epoxy resin is a colorless and transparent solid, the modified epoxy resin epoxy equivalent is 900g / eq to 1050g / eq, and the softening point is 90-100 DEG C. The modified epoxy resin has good mechanical properties, and good chemical resistance. The present invention further provides a preparation method of the modified epoxy resin, the preparation method is simple, with the introduction of active groups with low temperature curing activity, the activation energy of the curing reaction is reduced, the curing reaction temperature of powder coating can be reduced, performances of the unsaturated polyester ester resin and epoxy resin can be complementary, energy is saved, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a modified epoxy resin and a preparation method thereof. Background technique [0002] In recent years, powder coatings, as a new type of coatings that are pollution-free, less polluting, resource-saving and energy-saving, are developing rapidly with great vitality. It is used in the coating of metal products that have high requirements for corrosion resistance, electrical insulation, and indoor decoration protection, such as household appliances, metal furniture, instruments, indoor fitness equipment, radiators, switch boxes, bicycles, and automobiles. The surface coating of parts, liquefied gas cylinders, highways, railway transportation facilities, petroleum and chemical pipelines and other industries is widely used. [0003] Polymers used in the production of powder coatings are broadly divided into thermoset and thermoplastic coatings. Thermosetting coatings generally have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C09D163/00C09D5/03
Inventor 王新龙喻林周江明邓海波汤文红汤冬英蔡立
Owner CHINA PETROLEUM & CHEM CORP
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