Preparation of polyester hot-melt adhesive

A polyester hot-melt adhesive and polyolefin technology, applied in the direction of adhesives, etc., can solve the problems of high melt viscosity, low bonding strength, and high production cost, and achieve the effects of reduced melt viscosity, easy coating, and reduced dosage

Active Publication Date: 2009-01-28
江苏三耐特种设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of high melting viscosity, low bonding strength and high production cost of polyester hot melt adhesives in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0008] The preparation method of the polyester hot-melt adhesive of the present invention includes esterification reaction of dibasic acid and glycol in the presence of a catalyst, and then subjecting the product liquid obtained by the esterification reaction to polycondensation reaction, wherein the method also includes: Aliphatic polyolefin is added to the product liquid obtained by the polycondensation reaction and melted. The aliphatic polyolefin has excellent compatibility with the polyester obtained by the reaction.

[0009] Relative to the total weight of the dibasic acid and the diol, the amount of the aliphatic polyolefin may be 5-70% by weight, and preferably, the amount of the aliphatic polyolefin is 10-35% by weight. The aliphatic polyolefin in the preferred range can further strengthen the bonding strength of the formed polyester hot melt adhesive, and at the same time, can reduce the viscosity of the hot melt adhesive during melting.

[0010] The aliphatic polyolefin...

Example Embodiment

[0021] Example 1

[0022] This example illustrates the preparation method of the polyester hot melt adhesive of the present invention.

[0023] [Esterification reaction]

[0024] Add 180g of terephthalic acid, 52g of isophthalic acid, 20g of sebacic acid, 252g of 1,4-butanediol, and 0.2g of triphenyl phosphite into a three-necked flask, stir and raise the temperature to 170 ℃, then add 0.2g of tetra-n-butyl titanate. The temperature was continued to rise to 210°C and kept for 50 minutes. Water began to distill out after the temperature rose to 190°C. The total amount of water distilled out after 50 minutes at 210°C was 50 grams, indicating that the reaction was basically over.

[0025] In the above esterification reaction, the weight ratio of the diol to the dibasic acid is 1:1, and the weight ratio of the aliphatic dibasic acid to the aromatic dibasic acid in the dibasic acid is 1:11.6, which is relative to the dibasic acid and The total weight of the glycol, the amount of the ca...

Example Embodiment

[0029] Example 2

[0030] This example illustrates the preparation method of the polyester hot melt adhesive of the present invention.

[0031] [Esterification reaction]

[0032] Add 180 g of terephthalic acid, 72.5 g of isophthalic acid, 40 g of sebacic acid, 270 g of 1,4-butanediol, and 0.23 g of triphenyl phosphite into a three-necked flask, stir and heat to At 170°C, 0.23 g of tetra-n-butyl titanate was then added. The temperature was continued to rise to 210°C and kept for 60 minutes, where water began to distill out after the temperature rose to 190°C, and the total distilled amount of water after 60 minutes at 210°C was 57 grams, indicating that the reaction was basically over. Then the temperature in the three-necked flask was increased to 240°C and kept at a pressure of 100 Pa for 20 minutes.

[0033] In the above esterification reaction, the weight ratio of the diol to the dibasic acid is 1:1.08, and in the dibasic acid, the weight ratio of the aliphatic dibasic acid to ...

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PUM

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Abstract

The invention disclose a preparation method of a polyester hot melt adhesive, which comprises the steps of carrying out esterification to binary acids and diol in the presence of catalyst, and carrying out polycondensation reaction to the generated liquid which is obtained by the esterification, wherein, the method also comprises the steps of adding aliphatic polyolefin to the generated liquid which is obtained by the esterification and carrying out melting. By adding polyolefin in the preparation of the polyester hot melt adhesive, the melting viscosity of the polyester hot melt adhesive prepared by the invention is obviously reduced, for example, the melting viscosity of the polyester hot melt adhesive prepared by the invention is about 35pa question mark s, so the coating is easy when in use. In addition, the shear strength and the peeling strength of the polyester hot melt adhesive prepared by the invention are excellent; simultaneously, as the polyolefin is added, the amount of the polyester in the hot melt adhesive is reduced, thereby relatively reducing the cost of the hot-melt adhesive.

Description

technical field [0001] The invention relates to a preparation method of hot-melt adhesive, in particular to a preparation method of polyester hot-melt adhesive. Background technique [0002] Hot melt adhesive is an adhesive that melts and sizing by heating and solidifies rapidly at room temperature to achieve bonding. It is composed of a non-volatile and non-flammable resin that does not contain solvents and is 100% solid at room temperature. Generally, according to the composition of the hot melt adhesive matrix resin, it can be divided into ethylene-vinyl acetate copolymer (EVA), polyester, polyamide, etc. Among them, polyester hot melt adhesives are superior to EVA hot melt adhesives and polyamide hot melt adhesives in terms of heat resistance, cold resistance, moisture resistance, aging resistance and electrical properties. [0003] Polyester is a general term for polymers containing ester groups in the main chain, and is usually formed by polycondensation of diols and ...

Claims

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Application Information

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IPC IPC(8): C09J167/02C09J123/00
Inventor 姚云江江林
Owner 江苏三耐特种设备制造有限公司
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