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Oct 20, 2023
The preparation method of the prepreg as claimed in claim 6, characterized in that the preparation method of the prepreg is achieved by the following steps: 1. preparing an epoxy matrix resin: a weighing 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, 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 ℃ under stirring conditions. Then, add the 4,4 '- diaminodiphenylsulfone curing agent weighed in step 1, continue stirring and heating to 150 ℃, 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 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 ℃;
Preparation of prepreg: a. Hang the single-sided release paper onto the winding roller shaft (1), intermediate shaft (5), and winding roller shaft (4) of the single-sided release paper in sequence, so that the single-sided release paper is wound onto the roller shaft (1), intermediate roller shaft (5), and winding roller shaft (4) to form a transmission connection. Then, hang the double-sided release paper onto the double-sided release paper winding roller shaft (2), intermediate roller shaft (5), and product winding roller shaft (3) in sequence, Make the double-sided release paper winding roller shaft (2), intermediate roller shaft (5), and product winding roller shaft (3) form a transmission connection, and then set the fiber woven fabric between the single-sided release paper winding roller shaft 1 and the double-sided release paper winding roller shaft (2), where the single-sided release paper contacts the intermediate roller shaft (5), and then preheat the single-sided release paper winding roller shaft (1) and the double-sided release paper winding roller shaft (2) to 75-85 ℃; b. Pour the epoxy matrix resin prepared in step one into the "V-shaped" space formed by the single-sided release paper winding roller shaft (1) and the fiber woven cloth, and then activate the device to allow the fiber woven cloth and epoxy matrix resin to pass through the gap between the single-sided release paper winding roller shaft (1) and the double-sided release paper winding roller shaft (2) to obtain prepregs with single-sided release paper and double-sided release paper adhered on both sides, where:, Control the distance between the single-sided release paper winding roller shaft (1) and the double-sided release paper winding roller shaft (2) to be 0.1-2mm, the linearity of the double-sided release paper winding roller shaft (2) to be 100-300m/h, and the temperature of the epoxy matrix grease to be 75-85 ℃; Under the action of the single side release paper winding roller shaft (4), the single side release paper is peeled off, and at the same time, the product winding roller shaft (3) rolls the prepreg with double-sided release paper adhered to one side, completing the preparation of the prepreg.
a. Hang the single-sided release paper onto the single-sided release paper winding roller shaft (1), intermediate shaft (5), and single-sided release paper winding roller shaft (4) in order to form a transmission connection between the single-sided release paper winding roller shaft (1), intermediate roller shaft (5), and single-sided release paper winding roller shaft (4). Then, hang the double-sided release paper onto the double-sided release paper winding roller shaft (2), intermediate roller shaft (5), and product winding roller shaft (3) in order to make the double-sided release paper winding roller shaft (2), The intermediate roller shaft (5) and the product winding roller shaft (3) form a transmission connection, and then the fiber woven fabric is set between the single-sided release paper and the double-sided release paper between the single-sided release paper winding roller shaft 1 and the double-sided release paper winding roller shaft (2). The single-sided release paper contacts the intermediate roller shaft (5), and the single-sided release paper winding roller shaft (1) and the double-sided release paper winding roller shaft (2) are preheated to 75-85 ℃;
b. Pour the epoxy matrix resin prepared in step one into the "V-shaped" space formed by the single-sided release paper winding roller shaft (1) and the fiber woven cloth, and then activate the device to allow the fiber woven cloth and epoxy matrix resin to pass through the gap between the single-sided release paper winding roller shaft (1) and the double-sided release paper winding roller shaft (2) to obtain prepregs with single-sided release paper and double-sided release paper adhered on both sides, where:, Control the distance between the single-sided release paper winding roller shaft (1) and the double-sided release paper winding roller shaft (2) to be 0.1-2mm, the linearity of the double-sided release paper winding roller shaft (2) to be 100-300m/h, and the temperature of the epoxy matrix grease to be 75-85 ℃; Under the action of the single side release paper winding roller shaft (4), the single side release paper is peeled off, and at the same time, the product winding roller shaft (3) rolls the prepreg with double-sided release paper adhered to one side, completing the preparation of the prepreg.
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