Method for preparing hot-melt adhesive from polyester waste material

A waste and polyester technology, applied in the direction of adhesives, etc., can solve the problems of difficult coating operation, high melt viscosity of copolyester hot melt adhesive, etc., and achieve the effect of reducing harmful substance methanol, low melt viscosity and high bonding strength

Active Publication Date: 2009-05-20
靖江市顺海汽贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the modified polyether is added during the esterification reaction, so that the esterified product is modified, and the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Alcoholysis reaction

[0027] Add 220g of polyester waste (PBT), 292g of 1,6-hexanediol and 135g of 1,4-butanediol into a three-necked flask with a reflux device, raise the temperature and stir manually, and when heated to 180°C, add 0.26g The alcoholysis catalyst is zinc acetate, start mechanical stirring, control the reaction temperature between 180-190°C, and the alcoholysis reaction time is 3 hours, until the solution of the reaction system is milky white and free of particles, and the depolymerization reaction product is obtained.

[0028] In the above alcoholysis reaction, the weight ratio of polyester waste to glycol is 1:1.94, relative to the total weight of polyester waste and glycol, the amount of alcoholysis catalyst is 0.04% by weight.

[0029] 2. Esterification reaction

[0030]The resulting depolymerization reaction product was cooled to 100°C, then 99.6g of isophthalic acid, 80.8g of sebacic acid and 0.3g of esterification catalyst n-butyl titanate we...

Embodiment 2

[0036] 1. Alcoholysis reaction

[0037] Add 220g of polyester waste (PET) and 270g of 1,4-butanediol into a three-necked flask with a reflux device, heat up and stir manually, when heated to 180°C, add 0.232g of alcoholysis catalyst sodium acetate, start the mechanical Stirring, the reaction temperature is controlled between 180-190°C, and the alcoholysis reaction time is 3 hours, until the solution of the reaction system is milky white and free of particles, and the depolymerization reaction product is obtained.

[0038] In the above alcoholysis reaction, the weight ratio of polyester waste (PET) to glycol is 1:1.23, relative to the total weight of polyester waste and glycol, the amount of alcoholysis catalyst is 0.047% by weight.

[0039] 2. Esterification reaction

[0040] The resulting depolymerization reaction product was cooled to 100°C, and then 83g of terephthalic acid, 101g of sebacic acid and 0.3g of n-propyl titanate were added to the above-mentioned three-necked f...

Embodiment 3

[0046] 1. Alcoholysis reaction

[0047] Add 220g of polyester waste (PTT) and 315g of ethylene glycol into a three-necked flask with a reflux device, heat up and stir manually, when heated to 180°C, add 0.2g of alcoholysis catalyst manganese acetate, start mechanical stirring, and react The temperature is controlled between 180-190° C., and the alcoholysis reaction time is 3 hours, until the solution of the reaction system is milky white and free of particles, and a depolymerization reaction product is obtained.

[0048] In the above alcoholysis reaction, the weight ratio of polyester waste (PTT) to glycol is 1:1.43, relative to the total weight of polyester waste and glycol, the amount of alcoholysis catalyst is 0.037% by weight.

[0049] 2. Esterification reaction

[0050] The resulting depolymerization reaction product was cooled to 100°C, and then 99.6g of phthalic acid, 58.4g of adipic acid and 0.3g of n-ethyl titanate were added to a three-necked flask, stirred and heat...

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PUM

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Abstract

The invention provides a method for preparing hot melt adhesive by using polyester wastes; the method sequentially comprises the steps as follows: alcoholysis reaction, esterification and polycondensation of the polyester wastes; during the alcoholysis reaction, under the existence of alcoholysis catalyst and the conditions of the alcoholysis reaction, the polyester wastes react with diol, thus obtaining alcoholysis reaction products; during the esterification, under the existence of esterification catalyst and the conditions of the esterifiction reaction, the obtained alcoholysis reaction products react with dicarboxylic acid, thus gaining esterifiction reaction products; and during the polycondensation, under the existence of a stabilizer and the conditions of the polycondensation, the esterification reaction products are poly-condensed and the polycondensation is carried out with the existence of polyether. The hot melt adhesive prepared by the method has small melt viscosity, convenient operation when in use, and extremely high bonding strength.

Description

technical field [0001] The invention relates to a method for preparing hot-melt adhesives from polyester waste. Background technique [0002] Polyester is mainly used in the production of fibers, polyester bottles and films. The sources of polyester waste are mainly waste materials, scraps, discarded polyester bottles and polyester films generated during the production process. These large amounts of polyester waste generated during the manufacturing process and after use have raised environmental concerns. Moreover, with the rapid development of the polyester industry, polyester waste is increasing day by day, reaching hundreds of thousands of tons per year in China, so the recycling of polyester waste has become a major issue in the development of the current polyester industry. However, the amount and recovery rate of such waste is very small and very limited. Polyester waste and its products, especially the secondary waste produced by direct recycling, are not suitabl...

Claims

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Application Information

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IPC IPC(8): C09J167/00C08J11/00
Inventor 姚云江江林陶潜唐富兰
Owner 靖江市顺海汽贸有限公司
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