Highly heatproof polyurethane hot melt adhesive and three layer heat-sealing adhesive tape
A polyurethane hot-melt adhesive, high heat-resistant technology, applied in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problem of poor adhesion and water absorption without polyurethane hot-melt adhesives and other problems, to achieve excellent heat resistance and UV resistance, improve adhesion, and good fluidity
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Embodiment 1
[0036] A high heat-resistant polyurethane hot-melt adhesive, comprising the following raw materials in parts by weight:
[0037]
[0038] Wherein, the polyester polyol is formed by dehydration polycondensation of terephthalic acid and ethylene glycol in a molar ratio of 1.2:1 through a vacuum melting method, and in the vacuum melting method, the raw materials of the above ratio are first React at 80°C for 0.5h, then raise the temperature to 120°C for 1h, then raise the temperature to 250°C until the polyester polyol has a hydroxyl value of 100mgKOH / g and an acid value of 2mgKOH / g.
[0039] The chain extender is a mixture of alcohol amine chain extender and polyol chain extender with a molar ratio of 1:1; wherein the alcohol amine chain extender is triisopropanolamine and ethylene glycol amine. The molar ratio is a mixture of 1:0.8; the polyol chain extender is ethylene glycol, glycerol and pentaerythritol in a weight ratio of 1:1:1.
[0040] The preparation method of above...
Embodiment 2
[0045] A high heat-resistant polyurethane hot-melt adhesive, comprising the following raw materials in parts by weight:
[0046]
[0047] Wherein, the polyester polyol is formed by dehydration polycondensation of terephthalic acid and ethylene glycol in a molar ratio of 1.01:1 through a vacuum melting method, and in the vacuum melting method, the raw materials of the above ratio are first React at 80°C for 0.5h, then raise the temperature to 150°C for 1h, then raise the temperature to 190°C until the polyester polyol has a hydroxyl value of 80mgKOH / g and an acid value of 1.8mgKOH / g.
[0048] The chain extender is a mixture of alcohol amine chain extender and polyol chain extender with a molar ratio of 1:1.2; wherein the alcohol amine chain extender is triisopropanolamine and ethylene glycol amine. The molar ratio is a mixture of 1:1; the polyol chain extender is ethylene glycol, glycerol and pentaerythritol in a weight ratio of 1:2:1.
[0049] The preparation method of abo...
Embodiment 3
[0054] A high heat-resistant polyurethane hot-melt adhesive, comprising the following raw materials in parts by weight:
[0055]
[0056]
[0057] Wherein, the polyester polyol is made of terephthalic acid and ethylene glycol in a molar ratio of 1.35:1, and is formed by dehydration and polycondensation of a dealcoholizing agent through a vacuum melting method. React at 100°C for 0.5h, then raise the temperature to 170°C for 1h, then raise the temperature to 200°C until the polyester polyol has a hydroxyl value of 120mgKOH / g and an acid value of 2.1mgKOH / g.
[0058] The chain extender is a mixture of alcohol amine chain extender and polyol chain extender with a molar ratio of 1:0.8; wherein the alcohol amine chain extender is triisopropanolamine and ethylene glycol amine. The molar ratio is a mixture of 1:1.2; the polyol chain extender is ethylene glycol, glycerol and pentaerythritol in a weight ratio of 1:1:2.
[0059] The preparation method of above-mentioned high heat...
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