Properties of Epoxy Resin
Nov 2, 2023
The purpose of the present invention is to solve the problem of uneven toughening phase state and even no phase separation in existing epoxy matrix resin cured products, resulting in poor performance of epoxy matrix resin cured products that cannot meet the performance requirements of composite materials, as well as the complex preparation methods and processes of existing prepregs, imprecise control of resin content in prepregs, and high manufacturing costs of existing devices for preparing prepregs, The present invention provides an epoxy matrix resin, a prepreg, a preparation method thereof, and a device for preparing the prepreg.
The epoxy matrix resin of the present invention is made from 40 parts by weight of phenolic epoxy resin, 60 parts by weight of bisphenol A epoxy resin, 2-10 parts by weight of core-shell polymer, 15-24 parts by weight of curing agent, and 3.0-6.0 parts by weight of curing accelerator. The curing agent is a combination of dicyandiamide and 4,4 '- diaminodiphenyl sulfone, with 4,4' - diaminodiphenyl sulfone and dicyandiamide being 18 and 6 parts by weight, 14 and 7 parts by weight, 10 and 8 parts by weight, or 6 and 9 parts by weight, respectively; The curing accelerator is an organic urea or its derivative.
The preparation method of the epoxy matrix resin of the present invention is achieved by the following steps:
1. Weighing 40 parts of phenolic epoxy resin, 60 parts of bisphenol A epoxy resin, 2-10 parts of core-shell polymer, 15-24 parts of curing agent, and 3.0-6.0 parts of curing accelerator according to the mass fraction, the curing agent is a complex curing agent of dicyandiamide and 4,4 '- diaminodiphenyl sulfone, wherein the mass fractions of 4,4' - diaminodiphenyl sulfone and dicyandiamide are 18 parts and 6 parts, respectively 14 and 7 portions, 10 and 8 portions, or 6 and 9 portions, wherein the curing accelerator is an organic urea or its derivative;
2、 Mix 40 portions of phenolic epoxy resin, 60 portions of bisphenol A epoxy resin, and 2-10 portions of core-shell polymer weighed in step 1 into a container, and then heat them to 150 ° C under stirring conditions. Then, add the 4,4 '- diaminodiphenylsulfone curing agent weighed in step 1, continue stirring and heating to 150 ° C, hold for 3-5 minutes, and cool to room temperature to obtain B-order resin;
3、 Take 30 portions of the B-order resin obtained in step 2 and place them in a three-roller grinder. Then, add the dicyandiamide curing agent weighed in step 1 and the 3.0-6.0 portions of the curing accelerator weighed in step 1. Grind the resin in a three-roller grinder for 3-6 times, and then add the remaining B-order resin prepared in step 2. Continue grinding the resin in a three-roller grinder for 3-6 times to obtain the epoxy matrix resin; The temperature of the three roller grinding machine mentioned in step three is maintained at 60-70 ° C.
The preparation method of the epoxy matrix resin of the present invention involves 30 parts, and the number of parts in the B-order resin obtained in step 2 is the same as the reference used for weighing in step 1.
The prepreg of epoxy matrix resin is made of epoxy matrix resin and fiber woven fabric, with a controlled volatile content of less than 1%. The mass content of epoxy matrix resin is 37% -43%, and the epoxy matrix resin is made of 40 parts of phenolic epoxy resin, 60 parts of bisphenol A epoxy resin, 2-10 parts of core-shell polymer, 15-24 parts of curing agent, and 3.0-6.0 parts of curing accelerator by mass, The curing agent is a complex curing agent of dicyandiamide and 4,4 '- diaminodiphenyl sulfone, wherein the mass fractions of 4,4' - diaminodiphenyl sulfone and dicyandiamide are 18 and 6, 14 and 7, 10 and 8, or 6 and 9, respectively. The curing accelerator is an organic urea or its derivative.
The preparation method of the prepreg of the present invention is achieved through the following steps:
Preparation of epoxy matrix resin:
a. Weigh 40 parts by mass of phenolic epoxy resin, 60 parts of bisphenol A epoxy resin, 2-10 parts of core-shell polymer, 15-24 parts of curing agent, 3.0-6.0 parts of curing promoter, wherein the curing agent is a complex curing agent of dicyandiamide and 4,4 '- diaminodiphenylsulfone, The mass fractions of 4,4 '- diaminodiphenylsulfone and dicyandiamide are 18 and 6, 14 and 7, 10 and 8, or 6 and 9, respectively, and the curing accelerator is an organic urea or its derivative;
b. Mix 40 portions of phenolic epoxy resin, 60 portions of bisphenol A epoxy resin, and 2-10 portions of core-shell polymer weighed in step 1 into a container, and then heat them to 150 ° C under stirring conditions. Then, add the 4,4 '- diaminodiphenylsulfone curing agent weighed in step 1, continue stirring and heating to 150 ° C, hold for 3-5 minutes, and cool to room temperature to obtain B-order resin;
c. Take 30 portions of the B-order resin obtained in step 2 and place them in a three-roller grinder. Then, add the dicyandiamide curing agent weighed in step 1 and 3.0-6.0 portions of the curing accelerator. Grind the resin in a three-roller grinder for 3-6 times, and then add the remaining B-order resin prepared in step 2. Then, grind the resin in a three-roller grinder for 3-6 times to obtain the epoxy matrix resin; The temperature of the three roller grinding machine mentioned in step three is maintained at 60-70 ° C;
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