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Short-process spinning method for polyester industrial yarns

An industrial yarn and short-process technology, which is applied in the field of polyester industrial yarn, can solve the problems of increasing heterogeneous structure, unfavorable strength and modulus, and increasing the size of amorphous region, so as to reduce the number of thermal stretching series and magnification, Effect of reducing microstructural defects, reduction of tensile series

Active Publication Date: 2021-09-28
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technical route of polyester industrial yarn is long, the yarn is cooled first and then heated, and the energy consumption is greatly increased
The reason why the high-speed spinning process route of civil yarn is not suitable for the preparation of high-strength industrial yarn is that, in addition to the orientation of the polymer segment during the cooling and high-speed drawing of the polyester melt after extrusion, there is always a local The entanglement point is too late to open, resulting in uneven orientation. In addition, the high stress under high-speed conditions induces crystallization, and the microscopic heterogeneous structure of the fiber increases. This shows that although the crystallinity is high in the final fiber, the crystal size is small. , small thickness of lamellae, increase in the size of the amorphous region, which is not conducive to the improvement of strength and modulus, and poor dimensional stability

Method used

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  • Short-process spinning method for polyester industrial yarns
  • Short-process spinning method for polyester industrial yarns

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the polytetrafluoroethylene nano-particle containing ester group on the surface is as follows:

[0035] Configuration methacrylate volume content is 37.5% chlorobenzene solution, polytetrafluoroethylene nano-powder (polymerization degree is 5 * 10 3 , with an average particle diameter of 300nm) placed in the aforementioned solution (the mass ratio of polytetrafluoroethylene nano-powder to the aforementioned solution is 1:2), and treated with plasma in an argon atmosphere for 100 s to make formazan The chemical graft polymerization of acrylate on the surface of polytetrafluoroethylene nano powders forms a layer of graft polymer on the surface, and obtains a polytetrafluoroethylene with an average particle size of 300nm and an ester group content of 20ppm. Tetrafluoroethylene nanoparticles.

[0036] The structural formula of the polytetrafluoroethylene nanoparticles containing ester groups on the surface is as formula (I), wherein,

Embodiment 2

[0038] The preparation method of the polytetrafluoroethylene nano-particle containing ester group on the surface is as follows:

[0039] Configuration ethyl methacrylate volume content is the chlorobenzene solution of 37.5%, polytetrafluoroethylene nano-powder (polymerization degree is 5 * 10 3 , with an average particle diameter of 350nm) placed in the aforementioned solution (the mass ratio of polytetrafluoroethylene nano-powder to the aforementioned solution is 1:2), and treated with plasma in an argon atmosphere for 150s to make formazan Ethyl acrylate undergoes chemical graft polymerization on the surface of polytetrafluoroethylene nano-powders, forming a layer of graft polymer on the surface, and obtaining a surface containing ester groups with an average particle size of 350nm and an ester group content of 30ppm. PTFE nanoparticles.

[0040] The structural formula of the polytetrafluoroethylene nanoparticles containing ester groups on the surface is as formula (I), whe...

Embodiment 3

[0042] The preparation method of the polytetrafluoroethylene nano-particle containing ester group on the surface is as follows:

[0043] Configuration propyl methacrylate volume content is the chlorobenzene solution of 37.5%, polytetrafluoroethylene nano-powder (polymerization degree is 5 * 10 3 , with an average particle diameter of 400nm) placed in the aforementioned solution (the mass ratio of polytetrafluoroethylene nano-powder to the aforementioned solution is 1:2), and treated with plasma in an argon atmosphere, and the treatment time is 200s to make formazan Propyl acrylate is chemically grafted and polymerized on the surface of polytetrafluoroethylene nanopowders, forming a layer of graft polymer on the surface, and obtaining a surface containing ester groups with an average particle size of 400nm and an ester group content of 40ppm. PTFE nanoparticles.

[0044] The structural formula of the polytetrafluoroethylene nanoparticles containing ester groups on the surface ...

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Abstract

The invention relates to a short-process spinning method for polyester industrial yarns. The short-process spinning method for the polyester industrial yarns comprises the following step of introducing modified polytetrafluoroethylene into a polyester melt, and spinning according to a processing technology of the polyester industrial yarns, wherein the polyester is polydiethylene terephthalate, and the intrinsic viscosity of the polyester melt is 0.95 to 1.05 dL / g; the modified polytetrafluoroethylene is polytetrafluoroethylene nanoparticles containing ester groups on the surfaces; the average particle size of the polytetrafluoroethylene nanoparticles containing the ester groups on the surfaces does not exceed 600 nm, and the mass percentage of the ester groups is 10 to 100 ppm; the processing technological parameters of the polyester industrial yarns are as follows: the first-roller speed is 2000 to 3000m / min, the post-stretching stage is 2, the post-stretching multiplying power is 1.2 to 2.5, and the spray head stretching ratio is 300 to 500; and the content of the modified polytetrafluoroethylene in the finally prepared polyester industrial yarns does not exceed 0.5 percent by weight, the breaking strength of the polyester industrial yarns is greater than or equal to 7.8 cN / dtex, and the initial modulus is greater than or equal to 90 cN / dtex. According to the method, the friction force between polyester melt molecular chains is reduced by utilizing the extremely low friction coefficient of the modified polytetrafluoroethylene nano powder, and microscopic entanglement is reduced under the condition that the stretch ratio and the speed of a spray head are greatly increased.

Description

technical field [0001] The invention belongs to the technical field of polyester industrial yarn, and relates to a short-flow spinning method of polyester industrial yarn. Background technique [0002] Polyester industrial yarn has the advantages of mature processing technology, environmental protection, flexibility and strength, and is known as the most cost-effective high-performance fiber. Therefore, it is widely used in many fields such as engineering construction, transportation, aerospace, military protection, etc. . [0003] In the preparation of polyester industrial yarn, high-molecular-weight polyester is used for extrusion at a lower speed and lower multiple nozzle stretching (compared to high-speed spinning of civilian yarn), and then passed through multi-stage multi-time thermal drawing Stretching produces highly crystalline, highly oriented structural features to obtain high strength, high modulus, and high dimensional stability. The existing technical route o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10D01D5/16
CPCD01F6/92D01F1/10D01D5/16
Inventor 张玉梅陈康黄瑶王彤郁秀峰邵义伟陈瑞
Owner JIANGSU HENGLI CHEM FIBER
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