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Toughened epoxy curing agent and preparation method thereof

An epoxy curing agent and toughening technology, which is applied in the field of polymer materials, can solve the problems of chemical resistance and electrical performance degradation, easy cracking, poor flexibility, etc., and achieve good curing speed and strong crack resistance , Excellent toughening effect

Inactive Publication Date: 2019-02-01
江苏三木化工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the epoxy system also has the disadvantage of poor flexibility, which makes the cured paint film or glue block brittle and easy to crack
In order to improve this phenomenon, it is often necessary to add a large amount of toughening agent or plasticizer to the formulation, but this will lead to the problem of chemical resistance and electrical performance degradation at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 100 parts by weight of 1,3-cyclohexanedimethylamine into the reaction bottle, stir and heat up to 75-80°C, then add 200 parts by weight of epoxy soybean oil into the dropping funnel, drop it into the above reaction bottle, and keep the reaction The temperature in the bottle is 75-80°C. After the dropwise addition was completed, the reaction was continued at 75-80° C. for 3 hours to obtain the target product 1 with a yield of 98%. The basic indicators of target product 1 are as follows:

[0016] Appearance: Colorless to light yellow transparent liquid

[0017] Amine value: 240±20mgKOH / g

[0018] Viscosity: 2500~3500mPa·S / 25℃

[0019] Color: <2 (Fe-Co)

[0020] Finished product performance testing

[0021] Mix the epoxy resin and the above-mentioned finished curing agent in a ratio of 100 / 80, and evenly spread it on the tin plate to form a film with a film thickness of 40 μm. The measured basic properties are as follows: surface dry time 1 hour, hard drying time...

Embodiment 2

[0025] Add 100 parts by weight of diethylenetriamine into the reaction flask, stir and raise the temperature to 65-70°C. Add 300 parts by weight of epoxidized soybean oil into the dropping funnel, drop it into the reaction bottle, and keep the temperature in the reaction bottle at 65-70°C. After the dropwise addition, the reaction was continued at 65-70° C. for 2 hours to obtain the target product 2 with a yield of 98%. The basic indicators of target product 2 are as follows:

[0026] Appearance: Colorless to light yellow transparent liquid

[0027] Amine value: 400±20mgKOH / g

[0028] Viscosity: 1000~2000mPa·S / 25℃

[0029] Color: <2 (Fe-Co)

[0030] Finished product performance testing

[0031] Mix the epoxy resin and the above-mentioned finished curing agent in a ratio of 100 / 55, and evenly spread it on the tin plate to form a film with a film thickness of 40 μm. The measured basic properties are as follows: surface dry time 0.5 hours, hard drying time 2.5 hours, hardne...

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Abstract

The invention discloses a toughened epoxy curing agent and a preparation method thereof. The toughened epoxy curing agent is prepared by an amine substance and epoxidized soybean oil. The optimum composition ratio of raw materials is obtained through a large number of experimental screenings. The method prepares the toughened epoxy curing agent by modifying the amine substance and epoxidized soybean oil under optimal steps and conditions by a preferred scheme. The curing agent applied to epoxy resin has excellent toughness and crack resistance, and has good curing speed, impact resistance andcorrosion resistance, and achieves very good technical effects.

Description

technical field [0001] The invention relates to an epoxy resin curing agent, in particular to an environment-friendly toughening epoxy curing agent and a preparation method, and belongs to the technical field of polymer materials. Background technique [0002] The two-component system composed of epoxy resin and epoxy curing agent is widely used in floor coatings, Anti-corrosion coatings, adhesives, composite materials and other fields. However, the epoxy system also has the disadvantage of poor flexibility, which makes the cured paint film or glue block brittle and easy to crack. In order to improve this phenomenon, it is often necessary to add a large amount of toughening agent or plasticizer to the formula, but this will lead to the problems of chemical resistance and electrical performance degradation at the same time. Therefore, the design of epoxy curing agent with toughening effect has become a new idea to solve the flexibility problem of epoxy system. Contents of...

Claims

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Application Information

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IPC IPC(8): C08G59/50
CPCC08G59/5013
Inventor 王涛惠正权薛中群
Owner 江苏三木化工股份有限公司
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