Preparation method for non-crystalline low-melting point polyester hot melt adhesive

A low-melting point polyester and hot-melt adhesive technology, applied in the direction of adhesives, etc., can solve the problems of difficulty in coating time and speed, high viscosity, and easy crystallization

Inactive Publication Date: 2012-10-17
SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because the viscosity of this polyester hot-melt adhesive product is generally high and it is easy to crystallize, it is difficult to use it on light-colored clothing, sofas and other daily necessities.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 166 grams of terephthalic acid, 31.1 grams of isophthalic acid, 9.1 grams of 1,6-adipic acid and 89.3 grams of ethylene glycol into a 2000ml glass reaction kettle equipped with a thermometer, a strong stirrer, a fractionating column and a condenser , 28.6 grams of diethylene glycol, 9.4 grams of 1,5-pentanediol, and 0.21 grams of tetra-n-butyl titanate. Start stirring and heat up. When the temperature rises to about 180 degrees, water droplets begin to slip out, and the temperature is 95-105°C, and the temperature continues to rise slowly until the temperature in the kettle reaches about 220°C. After the amount of water slipping out reaches the theoretical value, the esterification reaction is over, and phosphoric acid is added. Trimethyl ester 0.103 g, antioxidant 1010 0.18 g, continue to gradually increase the temperature to about 250 ° C, use a vacuum pump to decompress and evacuate, keep the vacuum degree of the reaction system less than 133 Pa, and continue to ...

Embodiment 2

[0022] Add 166 grams of terephthalic acid, 20.8 grams of isophthalic acid, 18.3 grams of 1,6-adipic acid, and 89.3 grams of ethylene glycol into a 2000ml glass reaction kettle equipped with a thermometer, a strong stirrer, a fractionating column and a condenser , 19 grams of diethylene glycol, 18.7 grams of 1,5-pentanediol, and 0.32 grams of tetra-n-butyl titanate. Start stirring and heat up. When the temperature rises to about 180 degrees, water droplets begin to slip out, and the temperature is 95-105°C, and the temperature continues to rise slowly until the temperature in the kettle reaches about 220°C. After the amount of water slipping out reaches the theoretical value, the esterification reaction is over, and phosphoric acid is added. Trimethyl ester 0.25 g, antioxidant 10100.492 g, continue to gradually heat up to about 250 ° C, use a vacuum pump to decompress and evacuate, keep the vacuum degree of the reaction system less than 133 Pa, and continue to react at 250-260 ...

Embodiment 3-10

[0025] Proceed under the same steps and conditions as in Example 2, except that the raw materials used and their proportioning ratios are shown in the table below. The test results of the obtained products are also listed in the table.

[0026] Raw material ratio and product performance of table 1 embodiment 3~6

[0027] Example 3 4 5 6

[0028] Terephthalic acid, g 132.8 129.5 127.8 124.5 Isophthalic acid, g 24.9 36.5 29.9 33.2 1,6-Hexanedioic acid, g 7.3 1,10-Sebacic acid, g 10.1 Dodecanedioic acid, g 11.5 Ethylene glycol, g 83.7 66.2 83.7 89.3 1,4-Butanediol, g 8.2 1,5-pentanediol, g 9.4 1,6-Hexanediol,g 68.5 Diethylene glycol,g 38.2 31.8 38.2 35.775 Trimethyl phosphate, g 0.215 Triphenyl phosphite, g 0.166 0.20 0.238 Antioxidant 285, g ...

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Abstract

The present invention discloses a preparation method for a non-crystalline low-melting point polyester hot melt adhesive. The method comprises the following steps: (1) adopting neopentyl glycol, diethylene glycol, ethylene glycol, adipic acid, sebacic acid and m-phthalic acid as raw materials, and carrying out an esterification reaction under an effect of a catalyst; and (2) adding a stabilizer, a condensation polymerization catalyst and an antioxidant to the product from the step (1), and carrying out a reduced pressure condensation polymerization reaction to obtain a copolyester with a melting point less than 120 DEG C. The polyester hot melt adhesive of the present invention shows a transparent state at the high temperature and the room temperature, does not crystallize, has a good fluidity in low temperature use, and has excellent wettability.

Description

technical field [0001] The invention relates to a preparation method of non-crystalline low melting point polyester hot melt adhesive. Background technique [0002] Most of the currently known polyester hot melt adhesives use aromatic dibasic acids such as terephthalic acid (or dimethyl dibasic acid) and long-chain aliphatic dibasic acids (or dimethyl dibasic acid), binary Alcohol is obtained after esterification (or transesterification) and polycondensation. [0003] However, because the viscosity of this polyester hot-melt adhesive product is generally high, and it is easy to crystallize, it is difficult to be used on daily necessities such as light-colored clothes and sofas, and the coating time and speed are relatively difficult due to the fast crystallization. Contents of the invention [0004] The purpose of the invention is to disclose a kind of preparation method of amorphous low-melting point polyester, it is characterized in that comprising the steps: [0005] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/02C08G63/183
CPCC08G63/78C08G63/183C09J167/02
Inventor 李哲龙朱万育马志艳曾作祥韩涛
Owner SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD
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