Polyester thermosol and preparation method thereof

A technology of polyester hot melt adhesive and alkylene ester, which is applied in the direction of adhesives, etc., and can solve the problems of difficult high melting point bonding and low melting point of random polyester

Inactive Publication Date: 2007-07-04
SHANGHAI LIGHT IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting random polyester has a low melting point, which makes it difficult to meet the needs of adhesive applications that require a high melting point

Method used

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  • Polyester thermosol and preparation method thereof
  • Polyester thermosol and preparation method thereof
  • Polyester thermosol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add 170 grams of dimethyl terephthalate, 158 grams of 1,4-butanediol and 0.20 grams of n-ethyl phthalate in a 1000ml stainless steel reactor with thermometer, mechanical stirrer, fractionation column and condenser. Heat up the temperature, and when the temperature in the kettle reaches 100°C, start stirring immediately. When the temperature rises to about 145°C, methanol droplets begin to distill, and the distillation temperature is 60-70°C. Continue to heat up until the temperature in the kettle reaches about 200°C. When the amount of methanol distilled is greater than 97% of the theoretical amount, the transesterification is completed. Raise the temperature to 250-260°C, depressurize and evacuate with a vacuum pump, and release the vacuum when the stirring power reaches 90-95W. Take a small amount of sample from the reactor, and measure its weight-average molecular weight according to the above-mentioned method, which is 2200-3300, and the hydroxyl value is 40 mgKOH / g...

Embodiment 2-8

[0057] The processing method of following test is identical with embodiment 1, and used formula result is as shown in table 1 below:

[0058] 1

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Abstract

The invention provides a polyester hot melt adhesive. It comprises following components: (a) 15- 85 wt% of oligomerization phthalic acid C2- C6 alkylidene ester, with its weight- average molecular weight between 1100- 4400; (b) 15- 85 wt5 of oligomerization C2- C8 alkylidene dicarboxylic acid C2- C6 alkylidene ester with its weight- average molecular weight being 1000- 4000, and the weight- average molecular weight of said polyester hot melt adhesive is 20000- 35000 by taking the total weigth of polyester hot melt adhesive as basis. The method for preparing it comprises following steps: (1) mixing phthalic acid C1- C4 alkyl ester and C2- C6 alkylidene diol according to molar ratio between alcohol and acid being 1.7- 2.0: 1; (2) heating to 250- 260 Deg. C for polycondensation, and getting said phthalic acid C2- C6 alkylidene ester; (3) adding said oligomerization C2- C8 alkylidene dicarboxylic acid C2- C6 alkylidene ester into reaction system, stirring and heating to 240- 260 Deg. C for polycondensation. The polyester hot melt adhesive is characterized by high melting point and good flowability.

Description

technical field [0001] The invention relates to polyester hot-melt adhesives and a preparation method thereof, more particularly to block polyester hot-melt adhesives and a preparation method thereof. Background technique [0002] At present, polyester hot melt adhesives at home and abroad all use aromatic dibasic acids (or their dimethyl esters) such as terephthalic acid, long carbon chain aliphatic dibasic acids (or their dimethyl esters), and diols. First through esterification (or transesterification), and then obtained after polycondensation. [0003] Due to the different reactivity of aromatic dibasic acids and aliphatic dibasic acids, the reaction conditions are difficult to control and the reaction time is longer. The resulting random polyester has a low melting point, making it difficult to satisfy adhesive applications that require a high melting point. Contents of the invention [0004] The object of the present invention is to provide a kind of new polyester ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/03
Inventor 顾庆锋蔡真祝爱兰何文祥
Owner SHANGHAI LIGHT IND RES INST
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