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Low-melting-point polyester and preparation method thereof

A low-melting polyester and oligomer technology is applied in the field of low-melting polyester to achieve the effects of improving the heat absorption rate, stable product quality and low production energy consumption

Inactive Publication Date: 2020-03-31
CHINESE TEXTILE ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the raw material composition of this invention includes infrared absorber and free radical scavenger, due to the difference in substrate material and addition amount, the synergistic antioxidant of the two only plays a role in improving the anti-aging performance of polypropylene

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

[0050] Prepare low melting point polyester according to the preparation method provided by the invention, the steps are as follows:

[0051] (1) Terephthalic acid, 2-methyl-1,3-propanediol, ethylene glycol and xylyldibutylbenzofuranone are prepared into a slurry, and the acid-alcohol molar ratio in the slurry is 1:1.12, Based on 100 mole parts of terephthalic acid, 2-methyl-1,3-propanediol is 50 mole parts and ethylene glycol is 62 mole parts, of which 12 mole parts of ethylene glycol are excess aliphatic diols It will be removed in the subsequent reaction process; relative to the total weight of the low-melting polyester, the amount of xylyl dibutylbenzofuranone added is 300ppm;

[0052] (2) The slurry prepared in step (1) is continuously added to the esterification system composed of the first vertical esterification kettle and the second vertical esterification kettle for esterification reaction. The reaction temperature of the first esterification kettle is 260°C, reactio...

Embodiment 2

[0057] Prepare low melting point polyester according to the preparation method provided by the invention, the steps are as follows:

[0058] (1) Prepare terephthalic acid, 2-methyl-1,3-propanediol, ethylene glycol and methylene bis(4-methyl-6-tert-butylphenol) monoacrylate into slurry, in the slurry The acid-alcohol molar ratio is 1:1.12, based on 100 mole parts of terephthalic acid, 2-methyl-1,3-propanediol is 60 mole parts, ethylene glycol is 52 mole parts, and 12 mole parts of ethylene Diol is excess aliphatic dihydric alcohol and will be removed in the subsequent reaction process, relative to the total weight of low melting point polyester, the addition of methylene bis (4-methyl-6-tert-butylphenol) monoacrylate 500ppm;

[0059] (2) The slurry prepared in step (1) is continuously added to the esterification system composed of the first vertical esterification kettle and the second vertical esterification kettle for esterification reaction. The reaction temperature of the ...

Embodiment 3

[0064] Prepare low melting point polyester according to the preparation method provided by the invention, the steps are as follows:

[0065] (1) Terephthalic acid, 2-methyl-1,3-propanediol, diethylene glycol, ethylene glycol and [4-tert-butyl-2-(5-tert-butyl-2-oxo-3H- 1-benzofuran-3-yl)phenyl]-3,5-di-tert-butyl-4-hydroxybenzoate is formulated into a slurry, the acid-alcohol molar ratio in the slurry is 1:1.1, and aromatic The dibasic acid is based on 100 mole parts, so 2-methyl-1,3-propanediol is 60 mole parts, diethylene glycol is 10 mole parts, and ethylene glycol is 40 mole parts. Among them, the aromatic dibasic acid contains p- 90 molar parts of phthalic acid, 10 molar parts of isophthalic acid, and the ethylene glycol of 10 molar parts is that excess aliphatic dihydric alcohol will be removed in subsequent reaction process, with respect to the total weight of low-melting point polyester, [4 -tert-butyl-2-(5-tert-butyl-2-oxo-3H-1-benzofuran-3-yl)phenyl]-3,5-di-tert-butyl...

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Abstract

The invention discloses a low-melting-point polyester and a preparation method thereof. The low-melting-point polyester is prepared by copolymerizing the following aromatic dibasic acid and aliphaticdihydric alcohol in parts by molar weight: 100 parts of an aromatic dibasic acid, 40-100 parts of ethylene glycol, 20-60 parts of 2-methyl-1, 3-propylene glycol and 0-20 parts of diethylene glycol. The low-melting-point polyester also contains an infrared absorbent and a free radical scavenger. The preparation method of the low-melting-point polyester comprises the following steps: mixing the aromatic dibasic acid, the aliphatic dibasic alcohol and a free radical scavenger to prepare a slurry, esterifying, adding the infrared absorbent in an online adding manner, and carrying out pre-polycondensation and final polycondensation to prepare the low-melting-point polyester. The heat absorption rate of the low-melting-point polyester is increased by utilizing the infrared absorbent, so that theenergy consumption in the thermal bonding processing process of the polyester product can be remarkably reduced; free radicals formed by the polyester in a high-temperature heated environment can beefficiently captured by utilizing the free radical scavenger, so that the thermal stability of the low-melting-point polyester is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of low-melting-point polyesters, and in particular relates to a low-melting-point polyester and a preparation method thereof. Background technique [0002] Low-melting point polyester is a co-polymerized modified polyester with a low melting point, which is mainly used in the production of low-melting point polyester fibers. Low-melting point polyester fiber is a single-component or sheath-core composite fiber made of low-melting point polyester. Among them, the melting point of the core layer of the skin-core composite fiber is higher than that of the skin layer. After the skin layer is melted, the core layer part still maintains the fiber shape, so that it forms a point-like bond to ensure the performance of the bonded product. Low-melting polyester fiber can start to melt and bond at a lower temperature. It can not only replace environmentally unfriendly chemical adhesives, but also has excellent shape-m...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08K3/04C08K3/28C08K3/22
CPCC08G63/672C08K3/04C08K3/041C08K3/042C08K3/28C08K3/22C08K2003/2244C08K2003/2213
Inventor 邱志成李鑫刘玉来任爽李志勇金剑武术芳钟淑芳张凯悦
Owner CHINESE TEXTILE ACAD
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