High-uniformity military soft polyester industrial yarns and preparation method thereof

A technology of uniformity and industrial yarn, which is applied in the field of high uniformity military soft polyester industrial yarn and its preparation, can solve the problems of uneven strength, uneven fineness, and difficulty in silk processing.

Active Publication Date: 2017-02-15
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the spinning process, although the surrounding air has obvious advantages, it still cannot solve the problem of uneven cooling of porous filaments: since the spun silk is extruded from the circular spinneret, it is cooled by the surrounding air, Due to the large number of circles of the circular spinneret, it is difficult for the ring air to enter the innermost layer, resulting in that the innermost filaments may not be cooled after the outermost filaments have cooled, resulting in uneven fineness of the resulting filaments. Problems such as uneven strength make subsequent further processing of silk difficult

Method used

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  • High-uniformity military soft polyester industrial yarns and preparation method thereof
  • High-uniformity military soft polyester industrial yarns and preparation method thereof
  • High-uniformity military soft polyester industrial yarns and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A preparation method of modified polyester, specifically comprising the following steps:

[0062] (1) Preparation of glycol terephthalate:

[0063] Put terephthalic acid and 2-pentyl-1,3 propanediol in a molar ratio of 1:1.3 into a slurry and add it to the reactor, at a concentration of 50wt%, the amount added is 0.3% of the weight of terephthalic acid Under the catalysis of sulfuric acid, esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is normal pressure and the temperature is 180°C. Time is the end point of the esterification reaction to obtain diol terephthalate;

[0064] (2) Preparation of ethylene terephthalate:

[0065] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.2 and add them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is normal pressu...

Embodiment 2

[0070] A preparation method of modified polyester, specifically comprising the following steps:

[0071] (1) Preparation of glycol terephthalate:

[0072] Put terephthalic acid and 2-hexyl-1,3 propanediol with a molar ratio of 1:1.38 into a slurry and add to the reactor, at a concentration of 55wt%, add concentrated sulfuric acid in an amount of 0.32% of the weight of terephthalic acid Under the catalysis of the catalyst, the esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is 0.13 MPa and the temperature is 181 °C. For the end point of the esterification reaction, obtain diol terephthalate;

[0073] (2) Preparation of ethylene terephthalate:

[0074] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.3 and add them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressur...

Embodiment 3

[0079] A preparation method of modified polyester, specifically comprising the following steps:

[0080] (1) Preparation of glycol terephthalate:

[0081] Put terephthalic acid with a molar ratio of 1:1.33 and 2-heptyl-1,3 propanediol into a slurry and add it to the reactor. Under the catalysis of sulfuric acid, esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is 0.12 MPa and the temperature is 183 ° C. When the amount of water distilled in the esterification reaction reaches 92% of the theoretical value Time is the end point of the esterification reaction to obtain diol terephthalate;

[0082] (2) Preparation of ethylene terephthalate:

[0083] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.31 and put them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is ...

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Abstract

The invention relates to high-uniformity military soft polyester industrial yarns and a preparation method thereof. The high-uniformity military soft polyester industrial yarns comprise a raw material of modified polyester composed of a terephthalic acid chain segment, an ethylene glycol chain segment and a branched chain-containing diol chain segment. The preparation method of the high-uniformity military soft polyester industrial yarns comprises the steps: carrying out an esterification reaction of terephthalic acid and branched chain-containing diol under catalysis of concentrated sulfuric acid, to obtain diol terephthalate; then carrying out an esterification reaction of terephthalic acid and ethylene glycol to obtain ethylene glycol terephthalate; and finally, stirring and mixing the diol terephthalate and the ethylene glycol terephthalate, under the action of a catalyst and a stabilizer, carrying out polycondensation reaction at low vacuum stage and in high vacuum stage, to prepare modified polyester, and then carrying out metering, porous spinneret plate extruding, cooling, oiling, stretching, heat setting and winding of the modified polyester, to obtain the high-uniformity military soft polyester industrial yarns.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a high-uniform military soft polyester industrial yarn and a preparation method thereof. Background technique [0002] Since its inception, polyethylene terephthalate (PET fiber or polyester fiber) fiber has high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. It has a series of excellent performances such as anti-wrinkle and anti-wrinkle, good stiffness, etc. It is widely used in clothing, home textiles and other fields. [0003] Industrial polyester fibers mainly refer to chemical fibers with relatively special physical and chemical structures, properties and uses, or special functions, which are mostly used in industry, national defense, medical treatment, environmental protection and cutting-edge science. Strong corrosion, low wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/84C08G63/183C08G63/78D01D5/253D01D4/02D01D5/24
CPCC08G63/183C08G63/78D01D4/02D01D5/24D01D5/253D01F6/84
Inventor 范红卫赵慧荣范晓兵杨大矛宋光坤王山水杨超明何亮
Owner JIANGSU HENGLI CHEM FIBER
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