Method for preparing PNT (para nitro toluene) copolyester hot melt adhesive used for film manufacturing

A technology of copolyester and hot melt adhesive, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc. Good film-forming properties

Inactive Publication Date: 2015-04-01
ANHUI ZHUCHENG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polyester hot-melt adhesives are usually prepared by the reaction of polyacids and polyols, usually using dimethyl terephthalate, isophthalic acid, hexanediol and butanediol as raw materials. The synthetic polyester hot-melt adhesives are not Designed for film production, its film-forming performance is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 212.48g (1.28mol) of terephthalic acid, 69.72g (0.42mol) of isophthalic acid, 52.00g (0.50mol) of neopentyl glycol, 38.00g (0.50mol) of 1,3 propanediol, tetrabutyl titanate 14.90g, put into 1L reactor. The reaction kettle is equipped with stirring, temperature measuring system, rectification column and reflux condenser. After gradually raising the temperature to 100°C, the stirring is started. When the temperature is close to 190°C, water begins to distill out, and the distillation temperature is 98-100°C. Raise the temperature to 195°C, and the esterification reaction ends when the water output reaches more than 93% of the theoretical value;

[0019] Then add 0.50 g of triphenyl phosphite to carry out reduced-pressure compression polymerization reaction, gradually increase the temperature to 225 ° C, keep warm; the pressure in the reactor is gradually reduced to 90 Pa, and maintain for 60 minutes, the polycondensation reaction can be completed, and nitrogen gas is intr...

Embodiment 2

[0021] 224.10g (1.35mol) of terephthalic acid, 74.70g (0.45mol) of isophthalic acid, 52.00g (0.50mol) of neopentyl glycol, 38.00g (0.50mol) of 1,3 propanediol, tetrabutyl titanate 15.00g, put into 1L reactor. The reaction kettle is equipped with stirring, temperature measuring system, rectification column and reflux condenser. After gradually raising the temperature to 100°C, the stirring is started. When the temperature is close to 190°C, water begins to distill out, and the distillation temperature is 98-100°C. Raise the temperature to 195°C, and the esterification reaction ends when the water output reaches more than 93% of the theoretical value;

[0022] Then add 0.50g of triphenyl phosphite to carry out reduced-pressure compression polymerization reaction, gradually increase the temperature to 230°C, and keep warm; the pressure in the reactor is gradually reduced to 110Pa, and maintained for 72 minutes, the polycondensation reaction can be completed, and nitrogen gas is i...

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Abstract

The invention discloses a method for preparing PNT (para nitro toluene) copolyester hot melt adhesive used for film manufacturing. The method comprises the following steps: (1) terephthalic acid, isophthalic acid, neopentyl glycol and 1,3 propylene glycol have an esterification reaction under the action of titanium catalysts; (2) stabilizers and anti-oxydants are added to products of the step (1), so a pressure-reduction condensation polymerization reaction is conducted, and the PNT copolyester hot melt adhesive which is used for film manufacturing and is high in crystallization speed and short in opening time can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a polyester hot-melt adhesive for film-making, in particular to a method for preparing a PNT copolyester hot-melt adhesive for film-making with fast crystallization speed and short opening time. Background technique [0002] Polyester hot melt adhesive has the advantages of heat resistance, cold resistance, washing resistance, good bonding strength, good insulation performance, etc. It is mainly used in fabric processing, carpet backing, clothing processing, shoemaking, etc. Composite film, auto parts assembly, reinforcement materials, electrical industry are also applied. [0003] Polyester is a general term for ester groups (-CO-O-) in the main chain of polymers. It is divided into two categories: unsaturated polyester and thermoplastic polyester. From the perspective of molecular structure, the molecular straight chain of saturated polyester introduces The phenyl group will increase its melting point,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C09J167/02C09J11/06
Inventor 苏志玉
Owner ANHUI ZHUCHENG INFORMATION TECH
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