Preparation of Epoxy Resin Prepreg Blank

Preparation of prepreg:

a. Hang the single-sided release paper onto the single-sided release paper winding roller shaft 1, middle roller 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, middle 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, middle 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,Then preheat the single-sided release paper winding roller shaft 1 and the double-sided release paper winding roller shaft 2 to 75~85 ° C;

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, obtaining prepregs with single-sided release paper and double-sided release paper adhered on both sides, respectively,Among them, the distance between single-sided release paper winding roller shaft 1 and double-sided release paper winding roller shaft 2 is controlled to be 0.1-2mm, the linear speed of double-sided release paper winding roller shaft 2 is 100-300m/h, and the temperature of epoxy matrix resin is 75-85 ° C;

c. 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.

[0060] The number of parts in the B-order resin obtained from step 2 of step c in step 1 of this embodiment is the same as the reference used for weighing in step a.

The mass content of volatile matter in the prepreg prepared in Embodiment 15 is less than 1%, the mass content of epoxy matrix resin is 37%~43%, and the gel time at 120 ° C is 9~20min.

The preparation method of the prepreg in this embodiment adopts a one-step hot melt process, which has the advantages of low volatile content, environmental protection, and no environmental pollution compared to the solvent method; Compared to the hot melt adhesive film transfer method, which first compresses the matrix resin into a film shape and then composites with fiber woven fabric, its work efficiency is higher and the manufacturing cost is lower.

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