Polyurethane hot melt adhesive for car lamp
A polyurethane hot-melt adhesive and car lamp technology, applied in the field of polyurethane, can solve the problems of easy flow, reduced viscosity of hot-melt adhesive, poor adhesion of hot-melt adhesive, etc. Effect
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[0032]The preparation method of the polyurethane hot-melt adhesive for car lights described in this application is carried out according to the methods well known to those skilled in the art, that is, polyester polyol, polyether polyol, isocyanate, hydroxyl-terminated polybutadiene, antioxidant, accelerator The adhesive, the chain extender, the carbon black and the catalyst are mixed according to the proportion and then reacted to obtain the polyurethane hot-melt adhesive for the lamp. In a specific embodiment, in order to fully react, the preparation method of the polyurethane hot melt adhesive for car lights is specifically:
[0033] 1) Put polyether polyol, polyester polyol, and hydroxyl-terminated polybutadiene into the reaction kettle, heat to 100-130°C, vacuum dehydrate under stirring for 1.5-3 hours, and the vacuum degree is <-0.095MPa;
[0034] 2) Cool down to 80-90°C, put in isocyanate, 2 Protect and heat up to 93°C-98°C and stir for 0.5-1h;
[0035] 3) Then add the...
Embodiment 1
[0040] Add sebacic acid isophthalic acid and ethylene glycol neopentyl glycol ester diol polymer, polyether diol and hydroxyl-terminated polybutadiene into the reaction kettle according to the formula, and raise the temperature to 115 ° C ~ 120 ° C , under the condition of vacuum degree ≤-0.095MPa, dehydrate for 2h to water content ≤500ppm, then cool down to 80°C, add the formula amount of MDI, heat up to 95°C for 1h, then add diethylene glycol to continue the reaction for 1h until the reaction is complete, and finally Add the formulated amount of carbon black, antioxidant, and adhesion promoter, stir and disperse at 90-95°C for 1 hour under vacuum; finally add the catalyst, stir and react at 90-100°C for 1 hour under vacuum; after dispersing evenly, you can get the car lamp Polyurethane hot melt adhesive. The formula quantity of the raw materials used in this embodiment is shown in Table 1.
[0041] The data table of the present embodiment raw material formula of table 1
...
Embodiment 2
[0045] Add hexanediol adipate diol, polyether diol PPG1000, polyether diol PPG2000 and hydroxyl-terminated polybutadiene into the reaction kettle according to the formula, raise the temperature to 115°C-120°C, and Under the condition of vacuum degree ≤-0.095MPa, dehydrate for 2 hours to water content ≤500ppm, then cool down to 80°C, add the formulated amount of MDI-50, heat up to 95°C for 1 hour, then add 2-ethyl-1,3-hexanedi Continue to react the alcohol for 1h until the reaction is complete, finally add the formulated amount of carbon black, antioxidant, and adhesion promoter, stir and disperse for 1h at 90-95°C under vacuum; finally add the catalyst, stir and react at 90-100°C under vacuum 1h; After uniform dispersion, the polyurethane hot melt adhesive for car lamps was obtained. The formula quantity of the raw materials used in this embodiment is shown in Table 2.
[0046] Table 2 The formula data sheet of raw material used in the present embodiment
[0047] ra...
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