Waterborne copolyester and preparation method thereof

A copolyester, water-based technology, applied in the field of water-based copolyester and its preparation, to achieve the effect of improving optical transmittance and good stability

Active Publication Date: 2019-01-18
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a water-based copolyester and its preparation method, aiming to solve the problems of green environmental protection, cost reduction, and VOC emission reduction in the film coating industry, and at the same time solve the problem of its transmittance

Method used

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  • Waterborne copolyester and preparation method thereof
  • Waterborne copolyester and preparation method thereof

Examples

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Embodiment 1

[0044] Example 1: In a 20-liter polymerization reactor, PTA, IPA, AA, EG, and NPG were added according to the alkyd molar ratio of 1.5:1.0. Among them, the ratio of PTA to the total moles of dibasic acids is 40%, the ratio of IPA to the total moles of dibasic acids is 40%, the ratio of AA to the total moles of dibasic acids is 20%; the ratio of EG to the total moles of dibasic alcohols 75%, NPG accounted for 25% of the total glycol mole ratio, added antimony ethylene glycol 1.00 grams, phosphoric acid 1.50 grams, 2.05 grams of sodium acetate. use N 2 Pressurize after replacement three times, use the valve at the top of the fractionation column to adjust the pressure in the kettle at 0.2-0.25MPa (gauge pressure), and raise the temperature to 195°C-245°C to carry out the esterification reaction. When the amount of esterified water reaches the theoretical amount, release it to normal pressure, add 300 grams of SIPM powder, stir for 30 minutes, turn on the vacuum system, maintain...

Embodiment 2

[0045] Example 2: In a 20-liter polymerization reactor, PTA, IPA, AA, EG, and NPG were added according to the alkyd molar ratio of 1.5:1.0. Among them, the ratio of PTA to the total moles of dibasic acids is 50%, the ratio of IPA to the total moles of dibasic acids is 40%, the ratio of AA to the total moles of dibasic acids is 10%; the ratio of EG to the total moles of dibasic alcohols 60%, NPG accounted for 40% of the total molar ratio of glycols, 2.00 grams of ethylene glycol antimony, 2.75 grams of triphenyl phosphate, and 0.41 grams of sodium acetate were added. After the esterification was completed, 1000 grams of SIPE-EG solution with a mass fraction of 35% was added. The process control of esterification process, polycondensation process and preparation process is consistent with embodiment 1.

Embodiment 3

[0046] Example 3: In a 20-liter polymerization reactor, PTA, IPA, AA, EG, and NPG were added according to the alkyd molar ratio of 1.5:1.0. Among them, the ratio of PTA to the total moles of dibasic acids is 60%, the ratio of IPA to the total moles of dibasic acids is 25%, the ratio of AA to the total moles of dibasic acids is 15%; the ratio of EG to the total moles of dibasic alcohols 70%, NPG accounts for 30% of the total moles of glycols, 1.56 grams of ethylene glycol antimony, 3.00 grams of trimethyl phosphate, and 0.82 grams of sodium acetate are added. After the esterification is completed, 1200 grams of SIPE-EG solution with a mass fraction of 35% can be added. The process control of esterification process, polycondensation process and preparation process is consistent with embodiment 1.

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Abstract

The invention relates to novel waterborne copolyester and a preparation method thereof. Copolyester has good water solubility, can be used as a base material for preparing a waterborne coating liquid,and is mainly used for production and manufacture of online coated film products. Copolyester is prepared by steps that a dibasic acid monomer and a diol monomer are subjected to esterification and condensation polymerization under the action of a catalyst, a stabilizer, an ether inhibitor and a waterborne monomer, then copolyester is generated, 2-butoxyethanol is added for stirring, and the product is obtained; number-average molecular weight (Mn) of copolyester is 2000-8000, and acid value is smaller than 10 mgKOH/g. The waterborne coating liquid prepared from waterborne copolyester as thebase material has good stability and is directly applied to a PET film without need of adding any refraction particles, and after biaxial stretching and heat setting treatment, transmittance of a BOPET film can be improved.

Description

technical field [0001] The invention belongs to the field of synthesis and application of polyester, and in particular relates to a water-based copolyester and a preparation method thereof. Background technique [0002] The surface differential performance of online coating film products is mainly determined by the properties of the surface coating material, that is, the base material of the coating solution. The base material of the coating liquid is commonly known as the binder, also known as the film-forming material, and is generally a soluble material, which is divided into organic solvent-based materials and water-based materials. [0003] At present, the coating base materials commonly used in online coating include polyurethane, copolyester, acrylic, silicone oil and so on. Coating solutions with different base materials are suitable for different application fields. For example, polyurethane-based coating films can be used for direct heat sealing; silicone oil-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/183C08G63/78C08J7/04C09D167/02C09D7/63C09D7/61C08L67/02
CPCC08G63/183C08G63/20C08G63/78C08J2367/02C08K5/098C08K5/521C08K5/523C08K2003/329C09D167/02C08J7/0427
Inventor 胡兆麟翟丽鹏孟楷
Owner SINOPEC YIZHENG CHEM FIBER
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