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Long-chain branched polyester and preparation method thereof

A long-chain branched, polyester technology, applied in the field of polyester and its preparation, can solve the problems of affecting product performance, large difference in viscosity between polyester resin and chain extender, difficult to mix evenly, etc.

Active Publication Date: 2013-06-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the second method, the chain extender is either highly toxic or costly; the polyester resin and the chain extender have a large viscosity difference, and it is difficult to mix evenly, resulting in uneven chain extension and branching reactions, which affect product performance; and the chain extension method is adopted Increased the complexity of the preparation process, equipment investment

Method used

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  • Long-chain branched polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Put 66.45 g of terephthalic acid and 61.28 g of 1,4-butanediol into a 250 mL four-neck flask, connect the condensation device and the mechanical stirring device, add the catalyst n-titanate 0.136 g, and heat in an oil bath at 220 o C, Esterification and dehydration for 3 h at a nitrogen rate of 0.5 L / min to obtain an aromatic-terminated hydroxyl ester product.

[0054]At the same time, 58.45 g of adipic acid, 54.03 g of 1,4-butanediol, 0.67 g of diglycidyl tetrahydrophthalate and 0.12 g of catalyst isopropyl titanate were placed at 180 o C, Esterification and dehydration for 3 h at a nitrogen rate of 0.5 L / min to obtain the aliphatic terminal hydroxyl esterification product.

[0055] Then transfer the products in the two flasks to a 500 mL four-neck flask, connect the condensing device and the mechanical stirring device, add 0.5 g of rare earth catalyst lanthanum acetylacetonate, and gradually raise the oil temperature to 260 o C, the pressure gradually decreased to 3...

Embodiment 2

[0057] Put 68.87 g of 1,4-cyclohexanedicarboxylic acid and 70.90 g of 1,6-hexanediol into a 250 mL four-neck flask, connect the condensing device and mechanical stirring device, and heat the oil bath at 195 o C, Esterification and dehydration for 3 h at a nitrogen rate of 0.5 L / min to obtain an alicyclic hydroxyl-terminated esterification product.

[0058] At the same time, 47.24 g succinic acid, 70.90 g 1,6-hexanediol, 3.35 g glycidol and catalyst butyl titanate 0.12 g were placed at 180 o C, Esterification and dehydration for 3 h at a nitrogen rate of 0.5 L / min to obtain the aliphatic terminal hydroxyl esterification product.

[0059] The operation steps in the copolymerization stage were as in Example 1, and a copolyester with a weight average molecular weight of 145,000 was obtained, and the product was white and slightly yellowed.

Embodiment 3

[0061] Put 62.4 g of 2,5-furandicarboxylic acid and 61.28 g of 1,4-butanediol into a 250 mL four-neck flask, connect the condensing device and the mechanical stirring device, add the catalyst 0.136 g of butyl titanate, and put it in an oil bath Heating at 180 o C, Esterification and dehydration for 3 h at a rate of nitrogen in and out of 0.5 L / min to obtain a heterocyclic hydroxyl-terminated esterification product.

[0062] At the same time, 58.45 g of adipic acid, 54.03 g of butanediol, 0.67 g of diglycidyl terephthalate and 0.12 g of catalyst isopropyl titanate were placed in 180 o C, Esterification and dehydration for 3 h at a nitrogen rate of 0.5 L / min to obtain the aliphatic terminal hydroxyl esterification product.

[0063] The operation steps in the copolymerization stage were as in Example 1, and a copolyester with a weight average molecular weight of 130,000 was obtained, and the product was white and slightly yellowed.

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Abstract

The invention discloses long-chain branched polyester and a preparation method thereof. The long-chain branched polyester is obtained by carrying out esterification and polycondensation on a diacid component A, a diacid component B and a bifunctional branching agent component C such as biglycidyl ester, diglycidyl ether or glycidol and the like. According to the invention, a non-toxic bifunctional branching agent is directly adopted to in situ generate branching points; the preparation method is unique, preparation process is simple and environmentally-friendly, branching reaction is uniform,branching degree is easy to regulate and control, and the high molecular weight long-chain branched polyester can be prepared; and the preparation method can be used for preparation of non-degradablepolyester and preparation of biodegradable polyester, thereby being beneficial to the realization of commercialization. The long-chain branched polyester has the characteristics of long-chain branching and large molecular weight in structure and is beneficial to increase of melt strength and improvements of blow molding and foaming processing performance.

Description

technical field [0001] The invention relates to a polyester and a preparation method thereof, in particular to a long-chain branched polyester and a preparation method thereof. Background technique [0002] Polyester is an important class of polymers, widely used in engineering plastics, fibers, packaging materials, films and other fields. Among them, aromatic polyesters are mainly used as engineering plastics, fibers, beverage bottles, etc., while aliphatic polyesters and aromatic aliphatic copolyesters are important biodegradable polymers due to their biodegradability. Materials, films, fibers and other fields have important application prospects, especially in the field of biodegradable agricultural films, the application prospects are attractive. [0003] Compared with linear polyesters, long-chain branched polyesters are more conducive to processing processes such as film blowing and foaming due to their higher melt strength. The preparation of long-chain branched pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G63/183C08G63/78C08G63/46C08G63/199C08G63/42C08G63/16C08G63/91
Inventor 吴林波吕冉冉
Owner ZHEJIANG UNIV
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