Preparation method of polyester hot melt adhesive with low melting point and high crystallization rate
A technology of polyester hot melt adhesive and crystallization rate, which is applied in the direction of adhesives, film/sheet adhesives, non-polymer adhesive additives, etc., can solve the problem of slow crystallization rate of low melting point polyester hot melt adhesive Production efficiency, long-time drying and other problems, to achieve the effect of shortening the cooling and solidification time, reducing production efficiency, and efficient coating
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Embodiment 1
[0016] The preparation method of the high polyester hot-melt adhesive of low melting point and crystallization rate, the preparation method of described polyester hot-melt adhesive is as follows:
[0017] (1) Add an appropriate amount of nano-bentonite into the reactor and disperse with butanediol to form a uniform and stable slurry;
[0018] (2) Add dimethyl terephthalate, dimethyl isophthalate, and dimer acid to the reaction kettle of step (1) under stirring conditions. After mixing evenly, add an appropriate amount of catalyst tetra-n-butyl titanate Ester, conduct transesterification at 205-215°C for 1-2 hours under nitrogen protection, then add hydrogenated liquid polybutadiene diol and the rest of tetra-n-butyl titanate, and heat at 210-230°C under vacuum Polycondensation for 3-4 hours, the viscosity of the polycondensate is suitable, high-efficiency coating can be realized without depolymerization, and the polyester elastomer copolymer obtained above can be made into a f...
Embodiment 2
[0024] The preparation method of the high polyester hot-melt adhesive of low melting point and crystallization rate, the preparation method of described polyester hot-melt adhesive is as follows:
[0025] (1) Add an appropriate amount of nano-bentonite into the reactor and disperse with butanediol to form a uniform and stable slurry;
[0026] (2) Add dimethyl terephthalate, dimethyl isophthalate, and dimer acid to the reaction kettle of step (1) under stirring conditions. After mixing evenly, add an appropriate amount of catalyst tetra-n-butyl titanate Ester, conduct transesterification at 205-215°C for 1-2 hours under nitrogen protection, then add hydrogenated liquid polybutadiene diol and the rest of tetra-n-butyl titanate, and heat at 210-230°C under vacuum Polycondensation for 3-4 hours, the viscosity of the polycondensate is suitable, high-efficiency coating can be realized without depolymerization, and the polyester elastomer copolymer obtained above can be made into a f...
Embodiment 3
[0038] Compared with Examples 1 and 2, the polyester hot-melt adhesive prepared by the method of the prior art in Example 3 has poor viscosity performance and is difficult to coat efficiently. It needs to be decomposed under a nitrogen atmosphere with butylene glycol. Polymerization, high processing cost, inconvenient use, and compared with the polyester hot melt adhesives of Examples 1 and 2, the crystallization rate is obviously slower, the cooling and solidification time is more than 10% longer, and the coating efficiency is not high.
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