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Low-melting point polyester and preparation method thereof

A technology for low-melting polyester and methyl ester, applied in the field of low-melting polyester and its preparation, can solve the problems of slow melting speed and high melting point, and achieve the effects of fast melting speed, low melting point temperature, and lowering softening and flow temperature.

Active Publication Date: 2017-05-31
扬州富威尔复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of high melting point and slow melting speed of existing low melting point polyesters, realize large-scale production, and provide a kind of low melting point polyester and its preparation method

Method used

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  • Low-melting point polyester and preparation method thereof
  • Low-melting point polyester and preparation method thereof
  • Low-melting point polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of low melting point polyester:

[0036] (1) Esterification reaction;

[0037] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, benzoic acid and 2-pentyl-1,12 dodecanediol into slurry, carry out esterification reaction, under nitrogen atmosphere Pressurized reaction, the pressurized pressure is normal pressure, the temperature is 230 ° C, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; wherein, p-benzene The molar ratio of dicarboxylic acid, isophthalic acid, diethylene glycol, 2-pentyl-1,12 dodecanediol, and ethylene glycol is 1:0.4:0.1:0.05:1.8; the amount of benzoic acid added is benzene 0.01% of the moles of dicarboxylic acid.

[0038] (2) polycondensation reaction;

[0039] Then, under the action of catalyst and stabilizer, the polycon...

Embodiment 2

[0042] A kind of preparation method of low melting point polyester:

[0043] (1) Esterification reaction;

[0044] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, p-toluic acid and 2-hexyl-1,12 dodecanediol into a slurry, carry out esterification reaction, in nitrogen Pressurized reaction under the atmosphere, the pressurized pressure is 0.3MPa, the temperature is 250 ° C, when the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; wherein, The molar ratio of terephthalic acid, isophthalic acid, diethylene glycol, 2-hexyl-1,12 dodecanediol, and ethylene glycol is 1:0.6:0.3:0.1:2.5; p-toluic acid The addition amount is 0.5% of the moles of phthalic acid.

[0045] (2) polycondensation reaction;

[0046] Then, under the action of catalyst and stabilizer, the polycondensation reaction in th...

Embodiment 3

[0049] A kind of preparation method of low melting point polyester:

[0050] (1) Esterification reaction;

[0051] After preparing terephthalic acid, isophthalic acid, ethylene glycol, diethylene glycol, p-ethylbenzoic acid and 2-heptyl-12 dodecanediol into a slurry, carry out esterification reaction, in a nitrogen atmosphere Under pressurized reaction, the pressurized pressure is 0.1MPa, and the temperature is 240°C. When the distilled amount of water in the esterification reaction reaches more than 90% of the theoretical value, it is the end point of the esterification reaction, and the esterification product is obtained; wherein, for The molar ratio of phthalic acid, isophthalic acid, diethylene glycol, 2-heptyl-12 dodecanediol, and ethylene glycol is 1:0.5:0.2:0.07:2; the amount of p-ethylbenzoic acid added 0.1% of the moles of phthalic acid.

[0052] (2) polycondensation reaction;

[0053] Then, under the action of catalyst and stabilizer, the polycondensation reaction...

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Abstract

The invention relates to a low-melting point polyester and a preparation method of the low-melting point polyester. The low-melting point polyester comprises a terephthalic acid chain segment, a m-phthalic acid chain segment, an ethanediol chain segment, a diethylene glycol chain segment, a molecular weight modifier capping group and a branched chain containing codlemone chain segment; a molecular weight modifier corresponding to the molecular weight modifier capping group is specifically benzoic acid, p-toluylic acid or p-ethylbenzoic acid, or corresponding methyl ester or ethyl ester of benzoic acid, p-toluylic acid or p-ethylbenzoic acid, or saturated fatty acid or corresponding methyl ester or ethyl ester of the saturated fatty acid; the saturated fatty acid refers to a fatty acid with the carbon number of 9-30. The preparation method comprises the following steps: (1) enabling the terephthalic acid, the m-phthalic acid, the ethanediol, the diethylene glycol, the molecular weight modifier and the branched chain containing codlemone to have an esterification reaction; (2) then conducting condensation polymerization to prepare the low-melting point polyester. The molecular weight distribution of the prepared low-melting point polyester is relatively wide, the melting point is further reduced, and the melting speed is faster.

Description

technical field [0001] The invention belongs to the field of synthesis of low-melting-point polyesters, and relates to a low-melting-point polyester and a preparation method thereof, in particular to a low-melting-point polyester with a wider molecular weight distribution, further effectively lowering the melting point and faster melting speed, and a preparation method thereof. Background technique [0002] At present, the non-woven fabric industry is developing rapidly, especially the polyester non-woven fabric industry needs a polymer with a melting point lower than ordinary polyester, but has good compatibility with ordinary polyester as a thermal bonding fiber. Modification of ordinary polyester to prepare low melting point polyester. [0003] Low-melting point copolyester is a polyester with a lower melting point obtained by chemically modifying ordinary polyester. Because its structure is similar to that of ordinary polyester, it retains some of the characteristics of ...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/78C08G63/86
CPCC08G63/672C08G63/78C08G63/866
Inventor 张盛朱兴荣詹勇
Owner 扬州富威尔复合材料有限公司
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