Polyurethane resin for winding process, resin/fiber composite material as well as preparation method and application of resin/fiber composite material

[0043] Step 1: Warm up 1580g of ethylene glycol diglycidyl ether to 120°C to remove water by vacuuming for 1 hour. At 80°C, add 600g of acetic acid and 16g of triphenyl in accordance with the molar ratio of epoxy and carboxyl groups of 2:1 phosphine catalyst, reacted for 4 hours to obtain a compound containing hydroxyl and epoxy groups simultaneously, according to the ratio of isocyanate group and hydroxyl molar ratio of 1:1, add 1250g 2,4-diphenylmethane diisocyanate and 4, 4-Diphenylmethane diisocyanate mixture (any ratio is acceptable), continue to react for 6 hours to obtain epoxy group-terminated carbamate mixture.

[0044] Step 2: Configure the curing agent according to the following components and weight percentages:

[0045] High molecular weight amino-terminated polyether 30%, n=30

[0046] Low molecular weight amino-terminated polyether 60%, n=1

[0047] IPDA 10%

[0048] Oxazolidine water remover (ALT-101, Hunan Anxiang Elite Chemical Co., Ltd.) 1%

[0049] Fluorin

[0054] Step 1: Heat 2020g of butanediol diglycidyl ether to 120°C to remove water by vacuuming for 1 hour. At 140°C, add 740g of propionic acid and 2.76g P-toluenesulfonic acid catalyst, reacted for 0.5 hours to obtain a compound containing hydroxyl and epoxy groups at the same time, according to the ratio of isocyanate group and hydroxyl molar ratio of 1:1, add 1335g of polymerized diphenylmethane diisocyanate (commonly known as black material) at room temperature ), the reaction was continued for 10 hours to obtain an epoxy-terminated carbamate mixture.

[0055] Step 2: Configure the curing agent according to the following components and weight percentages:

[0056] High molecular weight amino-terminated polyether 10%, n=10

[0057] Low molecular weight amino-terminated polyether 60%, n=6

[0058] IPDA 20%

[0059] Triester orthoformate water remover (Bailingwei Company) 2%

[0060] Fluorine defoamer (MTK-4352, Nantong Matech New Material Co., Ltd.) 2%.

[0061] Step 3, mi

[0065] Step 1: Heat 2300g of hexanediol diglycidyl ether to 120°C to remove water by vacuuming for 1 hour. At 120°C, add 880g of butyric acid and 15.9g Triethylamine catalyst, reacted for 2 hours, obtained the compound containing hydroxyl group and epoxy group simultaneously, according to the ratio of isocyanate group and hydroxyl molar ratio being 1:1, add 1104.5g polymerization diphenylmethane diisocyanate (667g) and A mixture of methylphenyl diisocyanates (437.5 g) was continued for 8 hours to give a mixture of epoxy-terminated urethanes.

[0066] Step 2: Configure the curing agent according to the following components and weight percentages:

[0067] High molecular weight amino-terminated polyether 30%, n=20

[0068] Low molecular weight amino-terminated polyether 20%, n=4

[0069] HMDA 20%

[0070] Carbodiimide water remover (DMAP, Bailingwei Company) 2%

[0071] Fluorine defoamer (MTK-4352, Nantong Matech New Material Co., Ltd.) 1.5%

[0072] Step 3: Mix the epoxy resi