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Polyester Hot Melt Adhesive

A polyester hot-melt adhesive and copolymerization unit technology, used in adhesives and other directions, can solve the problems of poor flexibility, low light transmittance of the film, easy adhesion, etc., and achieve the effect of good flexibility and formability

Active Publication Date: 2017-08-01
SHANGHAI LIGHT IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of comonomers and poor segmental regularity, the crystallization ability is greatly affected
A random copolyester that cannot be crystallized, showing a transparent appearance. If the glass transition temperature is lower than room temperature, it is easy to stick and difficult to shape; if the glass transition temperature is higher than room temperature, it is brittle and hard, with poor flexibility, and cannot be used for fabrics and other soft materials. Substrate Bonding
Low-melting-point copolyester with certain crystallization ability can be finally formed after treatment, but due to crystallization, the prepared film has low light transmittance and high haze, and it is covered or blurred in the bonding of some colored substrates The color of the base material affects the aesthetic effect

Method used

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  • Polyester Hot Melt Adhesive
  • Polyester Hot Melt Adhesive
  • Polyester Hot Melt Adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add ethylene glycol 0.4mol, 1,4-butanediol 0.8mol, hydroquinone bis(β-hydroxyethyl) Ether diol (from Suzhou Xiangyuan Special Fine Chemical Co., Ltd., hydroxyl value 535±15mgKOH / g, molecular weight 198) 0.1mol, terephthalic acid 0.65mol, isophthalic acid 0.25mol, dimer acid 0.1mol, phthalein Acid n-ethyl ester 0.13 g. Heat up the temperature. When the temperature rises to about 160°C, water droplets begin to distill. The distillation temperature is 90-100°C. Continue to heat up until the temperature in the kettle reaches about 230°C. When the amount of water distilled reaches the theoretical amount, the esterification is completed and low molecular weight oligomers. Slow down the stirring speed, slowly add 0.1 g of n-ethyl phthalate, 0.1 g of triphenyl phosphate, and 0.25 g of antioxidant, then continue to gradually raise the temperature to about 240-260°C, and gradually increase the vacuum degree of the system until The vacuum degree of the system is less than 100Pa....

Embodiment 2-6， comparative Embodiment 1-2

[0060] Examples 2-6 and Comparative Examples 1-2 were carried out according to the same steps and conditions as Example 1, except that the raw materials used and their proportioning ratios are shown in Table 1 below. The analytical results of the obtained product are also listed in Table 1.

[0061] It can be seen from Table 1 that the polyester hot melt adhesive of the present invention has good flexibility, and after being made into a film, its light transmittance is above 75%, and its haze is below 30%. The ordinary low-melting point polyester hot melt adhesive has an opaque appearance, low light transmittance and high haze after film making.

[0062]

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Abstract

The invention relates to a polyester hot melt adhesive, which includes: (1) a dicarboxylic acid copolymerization unit, which comprises: (a) 60-100mol% of a phthalic acid copolymerization unit, (b) 0-20mol% of a C2-C12 aliphatic dicarboxylic acid copolymerization unit and (c) 0-20mol% dimeric acid, with the total mole number of the dicarboxylic acid copolymerization unit as reference; and (2) a diol copolymerization unit, which includes: (a) 80-99mol% of a C2-C10 aliphatic diol copolymerization unit and (b) 1-20mol% of an aromatic diol polyether diol copolymerization unit, with the total mole number of the diol copolymerization unit as reference. The weight average molecular weight Mw of the polyester hot melt adhesive is 0.02-1 million. The polyester hot melt adhesive provided by the invention has high transparency and low haze.

Description

technical field [0001] The invention relates to polyester hot-melt adhesives and applications thereof, in particular to transparent, low-melting polyester hot-melt adhesives and applications thereof. Background technique [0002] Polyester hot melt adhesives with lower melting points are generally obtained by reacting multi-component comonomers. Due to the large number of comonomers and poor segmental regularity, the crystallization ability is greatly affected. A random copolyester that cannot be crystallized, showing a transparent appearance. If the glass transition temperature is lower than room temperature, it is easy to stick and difficult to shape; if the glass transition temperature is higher than room temperature, it is brittle and hard, with poor flexibility, and cannot be used for fabrics and other soft materials. Substrate bonding. Low-melting-point copolyester with certain crystallization ability can be finally formed after treatment, but due to crystallization,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J167/02C08G63/672
Inventor 祝爱兰顾庆锋
Owner SHANGHAI LIGHT IND RES INST