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Method for preparing modified terephthalic acid neopentyl glycol copolyester hot melt adhesive for making membranes

A technology of pentanediol copolyester and terephthalic acid, which is applied in the direction of adhesives, etc., can solve the problems of easy transportation and storage, low initial melting point, etc., and achieve the effect that it is not easy to accumulate and stick together

Active Publication Date: 2015-02-04
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] The purpose of the present invention is to provide a high initial melting point (45-50°C) suitable for transportation and storage under high temperature conditions according to the defects of low initial melting point and inability to be easily transported and stored when the temperature is high in summer in existing hot melt adhesives. ) The manufacturing method of modified neopentyl glycol terephthalate copolyester hot melt adhesive, which meets the needs of related fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 2.5L polymerization reactor with a distillation device, add terephthalic acid (199.32g), isophthalic acid (66.44g), neopentyl glycol (156.23g), ethylene glycol (89.28g) and poly Ethylene glycol 400 (24.0g), titanium-silicon composite catalyst (0.137g), heating and stirring, when the internal temperature reaches 137°C, the material begins to melt;

[0018] When the internal temperature reached about 177°C, water began to distill out, and the temperature continued to rise to 200°C. When the amount of distilled water in the receiving bottle was 53.6g, the esterification reaction ended. Continue to raise the temperature to 235° C., distill off unreacted alcohol and a small amount of water, and then carry out reduced-pressure compression polymerization. The system pressure is kept at 300 Pa. The reaction time is 1.5 hours, and the polycondensation reaction ends. Release the vacuum state of the system, add microcrystalline wax (5.48g) to the product of step (2) at 230°C ...

Embodiment 2

[0020] In a 2.5L polymerization reactor with a distillation device, add terephthalic acid (182.74g), isophthalic acid (83.06g), neopentyl glycol (187.47g), ethylene glycol (70.76g) and poly Ethylene glycol 400 (24.0g), titanium-silicon composite catalyst (0.067g), heating and stirring, when the internal temperature reaches 136°C, the material begins to melt;

[0021] When the internal temperature reached about 181°C, water began to distill out, and the temperature continued to rise to 198°C. When the amount of distilled water in the receiving bottle was 52.7g, the esterification reaction ended. Continue to raise the temperature to 239° C., distill off unreacted alcohol and a small amount of water, and then carry out reduced-pressure compression polymerization. The system pressure is kept at 220 Pa. The reaction time is 1.5 hours, and the polycondensation reaction is completed. Release the vacuum state of the system, add microcrystalline wax (6.0 g) to the product of step (2) a...

Embodiment 3

[0024] In a 2.5L polymerization reactor with a distillation device, add terephthalic acid (199.32g), isophthalic acid (66.44g), neopentyl glycol (187.47g), ethylene glycol (70.76g) and poly Ethylene glycol 400 (24.0g), titanium-silicon composite catalyst (0.164g), heating and stirring, when the internal temperature reaches 141°C, the material begins to melt;

[0025] When the internal temperature reached about 178°C, water began to distill out, and the temperature continued to rise to 199°C. When the amount of distilled water in the receiving bottle was 54.6g, the esterification reaction ended. Continue to raise the temperature to 237° C., distill unreacted alcohol and a small amount of water, and then carry out reduced-pressure compression polymerization. The system pressure is kept at 130 Pa. The reaction time is 1.2 hours, and the polycondensation reaction is completed. Release the vacuum state of the system, add microcrystalline wax (2.98 g) to the product of step (2) at 2...

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PUM

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Abstract

The invention discloses a method for preparing a modified terephthalic acid neopentyl glycol copolyester hot melt adhesive for making membranes. The method mainly comprises the following steps: (1) esterifying terephthalic, m-phthalic acid, neopentyl glycol, ethylene glycol and polyethylene glycol 400 under the action of a TiO2 / SiO2 composite catalyst; (2) after esterification is completed, conducting decompression polycondensation to obtain a copolymer; (3) adding an addition agent into the product of the step (2), and softening the copolymer. The obtained modified terephthalic acid neopentyl glycol copolyester hot melt adhesive has the characteristic of a high initial melting point and resists high temperature and does not deposit knots during transportation and storage.

Description

technical field [0001] The invention relates to a modified neopentyl glycol terephthalate copolyester hot-melt adhesive for film making and a preparation method thereof, in particular to a modified adhesive with a high initial melting point and not easy to accumulate during transportation and storage in summer Neopentyl glycol phthalate copolyester hot melt adhesive. Background technique [0002] At present, polyester hot melt adhesives have been developed rapidly, and many properties have been improved, but relatively few units specialize in the research and development of high initial melting point polyester hot melt adhesives. From the point of view of the prior art, the initial melting point of the developed polyester hot-melt adhesive is generally low, which eventually leads to hot-melt adhesive powder or film easy to accumulate and stick into blocks during high-temperature transportation and storage in summer. Contents of the invention [0003] The purpose of the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J167/02C08G63/672C08G63/87C08G63/85
Inventor 曾作祥骆楚华李哲龙朱万育
Owner SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD
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