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Method for reducing curing reaction temperature and toughening thermosetting resin in situ

A curing reaction and thermosetting technology, applied in the direction of coating, etc., can solve the problems of loss of thermal and mechanical properties of thermosetting resins, damage to material processability, thermal properties and strength, etc., to achieve good mechanical properties, good thermal stability, and mechanical properties good performance

Inactive Publication Date: 2021-07-23
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional catalysts such as acids and imidazoles may lose the thermal and mechanical properties of thermosetting resins
[0004] Traditional methods of toughening and modifying thermosetting resins include blending with rubber elastomers, blending with thermoplastic resins, and blending with core-shell rubber particles (the preparation is relatively complicated). Although they can effectively improve the toughness of thermosetting resins, they will Damage the processability, thermal properties and strength of the material to varying degrees

Method used

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  • Method for reducing curing reaction temperature and toughening thermosetting resin in situ
  • Method for reducing curing reaction temperature and toughening thermosetting resin in situ
  • Method for reducing curing reaction temperature and toughening thermosetting resin in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A solution was prepared by dissolving indium nitrate and acetylacetone with a molar ratio of 1:2 in an appropriate amount of ethanol, and ultrasonically mixing for 5 min to prepare a solution; dissolving bisphenol A benzoxazine in an appropriate amount of acetone and ultrasonically for 5 min to prepare a solution. The two solutions were mixed by ultrasonication for 0.5 h to obtain a homogeneous solution. The molar ratio of the indium nitrate to bisphenol A benzoxazine is 1:20. The concentration of the transition metal nitrate is 0.03g / mL, and the concentration of the thermosetting resin solution is 0.3g / mL.

[0028] 1. Use a spray gun to evenly coat the above solution on the pre-treated substrate, and then vacuumize the solvent in an oven at 50°C / 1h and 70°C / 1h.

[0029] 2. Use the following steps to cure the sprayed substrate: 140°C / 1h, 160°C / 1h, 180°C / 1h and 200°C / 1h.

[0030] Finally, the polybenzoxazine coating (recorded as PB-In-A-5) has a carbon residue rate of ...

Embodiment 2

[0032] The difference between this example and Example 1 is that the molar ratio of indium nitrate and bisphenol A benzoxazine described in Step 1 is 1:10. Other steps and parameters are the same as in Example 1. Finally, the carbon residue rate of polybenzoxazine coating (recorded as PB-In-A-10) is 55.6%, T 5% The decomposition temperature is 328.4 o c. The impact resistance, hardness and surface adhesion are 7J, 6H and 5B respectively.

Embodiment 3

[0034] The difference between this embodiment and Embodiment 1 is that the molar ratio of indium nitrate and bisphenol A benzoxazine described in Step 1 is 1:5. Other steps and parameters are the same as in Example 1. Finally, the carbon residue rate of polybenzoxazine coating (recorded as PB-In-A-20) is 53.4%, T 5% The decomposition temperature is 327.6 o c. Impact resistance, hardness and surface adhesion are 4J, 5H and 4B respectively.

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Abstract

The invention relates to the field of modification and preparation of thermosetting resin and high-performance composite material matrix resin, in particular to a method for reducing curing reaction temperature and toughening thermosetting resin in situ. The method comprises steps: transition metal nitrate (an oxidizing agent) and fuel (a reducing agent) are dissolved in a proper amount of solvent and then ultrasonically mixed with a thermosetting resin dissolved in a proper amount of solvent to prepare a uniform solution; heat preserving is carried out in a vacuum oven to remove the solvent to obtain a thermosetting resin prepolymer; and finally, heating and curing are carried out at 140-200 DEG C. A combustion synthesis reaction technology is utilized, and a combustion synthesis reaction is introduced into a system, so that curing of thermosetting resin is catalyzed, and inorganic particles are generated in situ. The thermodynamic property of the thermosetting resin is improved while the curing temperature of the thermosetting resin is reduced.

Description

technical field [0001] The invention relates to the field of thermosetting resin curing, in particular to a method for reducing the curing reaction temperature and simultaneously toughening the thermosetting resin in situ. Background technique [0002] Advanced composite materials have the characteristics of high specific modulus, high specific strength, fatigue resistance, corrosion resistance, and strong designability. They have been widely used in aerospace, and their dosage is one of the important symbols of the advanced nature of aircraft. The main matrix of aerospace advanced composite materials is high-performance thermosetting resin (such as epoxy, bismaleimide, etc.). The main disadvantage of traditional thermosetting resins is that the cured product has poor toughness and inherits low impact damage resistance (low CAI performance) to fiber composite materials. In addition, high-performance thermosetting resins have a long molding cycle (more than ten hours), high ...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08J3/21C08L61/34C08K3/22C09D161/34C09D7/61
CPCC08J3/247C08J3/21C09D161/34C09D7/61C08J2361/34C08K3/22
Inventor 王智裴力赵思培李海龙
Owner ZHONGBEI UNIV
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