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Method for preparing polyester-nylon composite fibers by melt direct spinning

A polyester-nylon composite fiber, melt direct spinning technology, applied in the field of nylon materials, can solve the problems of low polymer molecular weight, slow reaction speed, oligomer control, etc., to reduce oligomer content, reduce content, and ensure quality Effect

Active Publication Date: 2020-07-10
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the polymerization process is carried out in a liquid state, the polymerization temperature must be at least 10°C higher than the melting point of nylon 6. At this time, the polymerization temperature still cannot control the oligomer in the range of direct spinning of the melt, and there is another disadvantage of low temperature polymerization , that is, the reaction speed is slow, and the molecular weight of the obtained polymer is relatively low; while the polymerization process at a lower temperature is actually divided into two parts, one part is the melt polymerization process, the other part is the solid phase polymerization process, and the solid phase polymerization process The process is to obtain a polymer with sufficient molecular weight for product development, but there is no effective way to turn the solid polymer formed at low temperature into a suitable spinning method. If fibers are spun from low-temperature polymers, they must first The polymer is melted, however, at this time due to the existence of a chemical reaction balance, low molecular weight compounds are formed again, so that there is no advantage compared with the normal polymerization method

Method used

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  • Method for preparing polyester-nylon composite fibers by melt direct spinning
  • Method for preparing polyester-nylon composite fibers by melt direct spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The first step: at a temperature of 80°C, caprolactam, terephthalic acid, deionized water and NH 2 (CH 2 ) 6 COOH was mixed in proportion, and stirred for 30 minutes under the condition of mechanical stirring (100r / min); among them, relative to caprolactam, the amount of deionized water added was 2wt%, the amount of terephthalic acid added was 0.2wt%, and the amount of NH 2 (CH 2 ) 6 The amount of COOH added is 0.5wt%;

[0080] The second step: After the mixture obtained in the first step is heated by the melt pump and the pre-heater, it is transported to the ring-opening kettle for ring-opening reaction. The polymerization temperature is controlled at 215 ° C, and the polymerization pressure is controlled at 1.5 MPa; the reaction time is The 0.8h prepolymer is transported to the top of the tower by a melt pump, mixed with fresh caprolactam, and the reflux rate is 1.3wt% of the caprolactam flow rate. When the following conditions are met, the reaction is terminated...

Embodiment 2

[0091] Step 1: Mix caprolactam, phthalic acid, deionized water and nylon 66 salt in proportion at a temperature of 130°C, and stir for 30 minutes under mechanical stirring (140r / min); For caprolactam, the addition of deionized water is 5wt%, the addition of phthalic acid is 0.2wt%, and the addition of nylon 66 salt is 0.05wt%;

[0092] The second step: After the mixture obtained in the first step is heated by the melt pump and the pre-heater, it is transported to the ring-opening kettle for ring-opening reaction. The polymerization temperature is controlled at 255 ° C, and the polymerization pressure is controlled at 0.3 MPa; the reaction time is The 1.2h prepolymer is transported to the top of the tower by a melt pump, mixed with fresh caprolactam, and the reflux rate is 0.5wt% of the caprolactam flow rate. When the following conditions are met, the reaction is terminated: the molecular weight of the obtained prepolymer is 8470, the extractable content is ≤9.2wt%, and the cyc...

Embodiment 3

[0103] The first step: at a temperature of 90°C, caprolactam, HOOC (CH 2 ) 4 COOH, deionized water and NH 2 (CH 2 ) 6 COOH was mixed in proportion, and stirred for 30min under the condition of mechanical stirring (80r / min); the amount of deionized water added was 2.7wt% relative to caprolactam, and HOOC(CH 2 ) 4 The amount of COOH added is 0.3wt%, NH 2 (CH 2 ) 6 The amount of COOH added is 0.4wt%;

[0104] The second step: After the mixture obtained in the first step is heated by the melt pump and the pre-heater, it is transported to the ring-opening kettle for ring-opening reaction. The polymerization temperature is controlled at 225 ° C, and the polymerization pressure is controlled at 0.8 MPa; the reaction time is The 0.7h prepolymer is transported to the top of the tower by a melt pump, mixed with fresh caprolactam, and the reflux flow is 0.7wt% of the caprolactam flow. When the following conditions are met, the reaction is terminated: the molecular weight of the ...

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Abstract

The invention relates to the field of nylon materials, and discloses a method for preparing polyester-nylon composite fibers by melt direct spinning. The method comprises the following steps of 1) burdening, specifically, heating and mixing caprolactam, an end-capping reagent, water and a catalyst to obtain a mixture; 2) ring opening; 3) pre-polycondensation, specifically, carrying out a pre-polycondensation reaction and devolatilization; 4) final polycondensation, specifically, carrying out a final polycondensation reaction and devolatilization; 5) devolatilizing before spinning; and 6) spinning, specifically, directly conveying nylon melt and polyester melt which are devolatilized before spinning to a composite spinning assembly, performing extruding, cooling, oiling, stretching and winding to obtain the polyester-nylon composite fibers. By means of the method, direct spinning after nylon melt polymerization can be achieved, slices do not need to be prepared in advance, and the content of hot water extractables and cyclic dimers in the nylon melt can be effectively controlled; and composite spinning is carried out on the nylon melt and the polyester melt to obtain the polyester-nylon composite fibers in different composite forms.

Description

technical field [0001] The invention relates to the field of nylon materials, in particular to a method for preparing polyester-nylon composite fibers by melt direct spinning. Background technique [0002] The competition in the fiber market is fierce, the conventional fiber market has gradually become saturated, and the conventional fiber has low added value and single function, which has gradually failed to meet the growing needs of people. The development of differentiated fibers is a must for fiber companies to seek development. The general trend of the development of the fiber industry. Composite fiber is an important branch of differential fiber, among which polyester / nylon composite fiber is a relatively common composite fiber in the market. The main reason is that both PET and PA6 have good spinnability, and the production technology of polyester and nylon fibers is very mature. Since nylon cannot be directly spun from the melt at present, the method for preparing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/12D01F8/14C08G69/36B01J3/00B01J19/18D01D5/30D01D5/32D01D5/34D01D5/08
CPCD01F8/12D01F8/14C08G69/36B01J3/006B01J19/0053B01J19/18D01D5/30D01D5/32D01D5/34D01D5/08Y02P70/62
Inventor 王松林徐锦龙汤廉黄家鹏何宁艳王华平王朝生
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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