Preparation method of low-melting point elastic polyester

A technology of elastic polyester and low melting point, applied in the direction of single-component copolyester rayon, etc., can solve the limitations of product application fields, the physical properties of low melting point polyester products are general, and the physical properties of low melting point polyamide cannot be achieved and other problems, to achieve the effects of low cost, increased reaction speed of esterification and polymerization, and less addition

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] At present, the physical properties of the low-melting point polyester products prepared in the prior art literature are average, and the physi

Method used

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  • Preparation method of low-melting point elastic polyester
  • Preparation method of low-melting point elastic polyester
  • Preparation method of low-melting point elastic polyester

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Example

[0030] Examples 1~3

[0031] 1) Use terephthalic acid, isophthalic acid, ethylene glycol, and a certain amount of aliphatic (cyclic) dibasic acid with three carbon chains or more, and aliphatic (cyclic) diol with three carbon chain or more. The amount of polyether polyol is the raw material for the reaction, and the esterification reaction is carried out at 200-250°C under normal pressure. The molar ratio of the raw materials is (all acids): (all alcohols)=1:1.1-1.8, and the reaction is to esterification The rate is not less than 92%, and the water produced during the reaction is removed;

[0032] 2) Prepolymerization: After the reaction is over, the system is slowly evacuated, the vacuum degree is 200~300Pa, the temperature is 230~260℃, and the duration is 1~2 hours;

[0033] 3) Polycondensation: Then pump high vacuum, vacuum degree ≤200Pa, temperature 240~270℃, duration 2~3h, to prepare low melting point elastic copolyester.

[0034] See Table 1 for the reaction raw material ratio ...

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Abstract

The invention discloses a preparation method of low-melting point elastic polyester. The method concretely comprises the following steps: 1) esterifying: adding a component a, a component b and a component c to terephthalic acid, isophthalic acid and ethylene glycol which are used as basic raw materials, and carrying out normal pressure esterification under the action of a titanium group catalyst;2) prepolymerizing: carrying out a prepolymerization reaction on a reaction system obtained after the esterification reaction; and 3) polycondensing: carrying out a polycondensation reaction on the prepolymerization product to obtain the low-melting point elastic polyester. The titanium group catalyst used in the invention has good reactivity, and makes the polyester product environmentally friendly; the physical properties of the spun fiber of the low-melting point elastic polyester are close to those of commercial low-melting point nylon, and the elastic recovery rate is 80% when the elongation rate is 10%, and is about two times that of ordinary low-melting point polyester; and the spun fiber can be used in fields of filament sewing threads, ultra-clean wiping cloth bonding, filament woven mesh bonding and monofilament woven meshes.

Description

technical field [0001] The invention belongs to the technical field of copolyester preparation, in particular to a preparation method of low melting point elastic polyester. Background technique [0002] At present, there are two main categories of research and application of low-melting point fibers at home and abroad: low-melting point polyester and low-melting point polyamide. [0003] Low-melting point polyester products are developed to solve the problem of bonding with polyester fibers. It is a new type of modified polyester with a lower melting point. By adding modified components during the polymerization of ordinary polyesters, PET can be changed Molecular structure, while reducing its crystallinity, so as to achieve the purpose of lowering the melting point. From the perspective of the development history of thermal bonding fibers, the research and development of low-melting point polyester products in foreign countries started earlier, and the technology is more ...

Claims

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Application Information

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IPC IPC(8): C08G63/672C08G63/85C08G63/199C08G63/183D01F6/84
CPCC08G63/183C08G63/199C08G63/672C08G63/85D01F6/84
Inventor 谭晓玲沈伟吴一平林雪梅任明利朱金芳周涛金萍
Owner CHINA PETROLEUM & CHEM CORP
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