A kind of anti-yellowing self-healing coating composition, automobile paint surface protective film and preparation method thereof
A coating composition and self-healing technology, which is applied in the field of coatings and automotive paint protection films, can solve problems such as precipitation risks, achieve reduced surface tension, excellent water, oil, and antifouling properties, and excellent resistance to physical scratches Effect
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[0063] In a specific embodiment, the preparation method of the hydroxyl-terminated polyurethane prepolymer comprises the following steps:
[0064] 1) Put the polyether triol, polyester diol, reactive wetting and leveling agent, reactive slip agent, reactive ultraviolet absorber, aliphatic isocyanate, antioxidant, solvent into the reaction kettle, 50~ Stir well at 60°C;
[0065] 2) Add catalyst, gradually heat up to 85-95°C, and react at normal pressure for 4-6 hours, measure the NCO content every half an hour, and when NCO drops to zero, discharge to obtain the hydroxyl-terminated polyurethane prepolymer .
[0066] In one embodiment, the branched hydroxy polyester is selected from one or both of Covestro Desmophen 670 and BASF Sovermol 1052;
[0067] In one embodiment, the chain extender is selected from one of 1,4 butanediol, diethylene glycol, and neopentyl glycol;
[0068] In one embodiment, the curing agent is selected from one of BASF Basonat HI100, BASF Basonat HI190 ...
Embodiment 1
[0075] Preparation of a hydroxyl-terminated polyurethane prepolymer
[0076] The raw materials used in this example and the quality are shown in Table 1.
[0077] Table 1
[0078]
[0079] The preparation steps of the hydroxyl-terminated polyurethane prepolymer of the present embodiment are as follows:
[0080] 1) 600 g of polyoxypropylene triol, 200 g of polyneopentyl adipate diol, 40 g of leveling agent side hydroxyl two-functional silicone modified polyether, and 20 g of antifouling slip agent perfluoropolyether alcohol , UV absorber UV950L 40g, butyl acetate 61.5g, antioxidant 1010 0.5g, 1,6-hexamethylene diisocyanate 38g were put into the reaction kettle, and stirred at 50 ℃;
[0081] 2) add organic bismuth catalyst 0.04g, gradually be warming up to 95 ℃, after 6 hours of normal pressure reaction, measure NCO content every half an hour, when NCO drops to zero, discharge material namely get hydroxyl-terminated polyurethane according to embodiment 1 prepolymer. The i...
Embodiment 2
[0083] Preparation of a hydroxyl-terminated polyurethane prepolymer
[0084] The raw materials used in this example and the quality are shown in Table 2.
[0085] Table 2
[0086]
[0087] The preparation steps of the hydroxyl-terminated polyurethane prepolymer of the present embodiment are as follows:
[0088] 1) 600 g of polyoxypropylene / ethylene oxide copolymerized triol, 200 g of polymethyltrimethylene adipate diol, 40 g of leveling agent hydroxyl-terminated two-functional silicone-modified polyether, antifouling and slippery agent perfluoropolyether 20g of ether amide ethyl alcohol, 40g of ultraviolet absorber R-455, 65g of dimethyl carbonate, 0.5g of antioxidant 1076, and 34.5g of isophorone diisocyanate were put into the reaction kettle, and stirred at 50°C;
[0089] 2) add organic bismuth catalyst 0.04g, gradually be warming up to 95 ℃, after 6 hours of normal pressure reaction, measure NCO content every half an hour, when NCO drops to zero, discharge material nam...
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