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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

Active Publication Date: 2019-03-08
佛山市顺德区凯力胶粘制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crystallization rate of low-melting-point polyester hot-melt adhesives is slow, resulting in a longer drying time for the product after coating, otherwise there will be interlayer adhesion, resulting in waste products, greatly reducing production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a preparation method of a low-melting-point high-crystallization-rate polyester hot-melt adhesive, which comprises the following steps: (1) adding a right amount of nano bentonite into a reaction kettle, and dispersing with butanediol to form a uniform stable slurry; (2) adding dimethyl terephthalate, dimethyl isophthalate and dimer acid into the reaction kettle in the step (1) under stirring conditions, adding a right amount of catalyst tetra-n-butyl titanate, carrying out ester exchange reaction at 205-215 DEG C in a nitrogen protective atmosphere for 1-2 hours, adding a hydrogenation liquid polybutadiene dibasic alcohol and the rest of tetra-n-butyl titanate, and heating at 210-230 DEG C in a vacuum to carry out polycondensation for 3-4 hours. The polyester hot-melt adhesive prepared in a nano bentonite in-situ polymerization mode has lower melting point and can quickly crystallize. The prepared polyester hot-melt adhesive has close melting point to the low-melting-point hot-melt adhesive in the prior art. Compared with the crystallization rate of the low-melting-point hot-melt adhesive in the prior art, the crystallization rate is enhanced by 15% or above.

Description

technical field [0001] The invention relates to a preparation method of polyester hot-melt adhesive with low melting point and high crystallization rate. Background technique [0002] Polyester hot-melt adhesive is an environmentally friendly hot-melt adhesive, which has the advantages of high bonding strength, outstanding bonding performance to polar materials, excellent electrical properties and chemical medium resistance, and is widely used in textiles, clothing, automobiles, Packaging, shoemaking, electronics, building materials and other industries have shown a trend of vigorous development in recent years. Polyester hot melt adhesive is obtained by polycondensation of aromatic dibasic acid, aliphatic dibasic acid and aliphatic diol as raw materials. With the implementation of low-carbon economy, low coating temperature has become one of the development directions of hot-melt adhesive performance, which requires polyester hot-melt adhesive to have a lower melting point...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J167/02C09J11/04C09J7/00C08G63/183C08G63/85
CPCC08G63/183C08G63/85C08K3/346C08K2201/011C09J7/00C09J11/04C09J167/02C09J2301/304C09J2301/408
Inventor 林初煌
Owner 佛山市顺德区凯力胶粘制品有限公司
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