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Production method of phosphorus copolymerization flame-retardant regenerated polyester chip and industrial yarn of the polyester chip

A technology of recycled polyester and copolymer flame retardant, which is applied in the field of flame retardant polyester industrial yarn production, can solve problems such as difficulty in increasing melt viscosity, and achieve far-reaching effects of reducing intrinsic viscosity and increasing polyester melt viscosity.

Active Publication Date: 2014-09-03
浙江金汇特材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the production of textile fibers by copolymerization flame retardant modification method is relatively common, but there are few reports on the production of recycled polyester industrial yarn by copolymerization flame retardant modification method. The difficulties are mainly reflected in the following aspects: (1) flame retardant ester The chemical reaction may cause the molecular chain to be terminated, preventing further polycondensation reaction and subsequent solid-phase polymerization reaction; (2) the existence of flame-retardant groups in the molecular chain makes it difficult to increase the melt viscosity in the solid-phase polycondensation process, so It also increases the technical difficulty of the production of recycled polyester industrial yarn

Method used

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  • Production method of phosphorus copolymerization flame-retardant regenerated polyester chip and industrial yarn of the polyester chip
  • Production method of phosphorus copolymerization flame-retardant regenerated polyester chip and industrial yarn of the polyester chip
  • Production method of phosphorus copolymerization flame-retardant regenerated polyester chip and industrial yarn of the polyester chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Production of 1110dtex / 192f flame-retardant recycled polyester industrial yarn

[0036] (1) Solid phase polymerization

[0037] Feed the flame-retardant recycled polyester chips prepared above into the solid-state polymerization system, carry out dry crystallization at 160-180°C, and under the protection of nitrogen with oxygen content ≤ 100ppm, make the molecular chain The polycondensation reaction occurs again at the end to obtain a high molecular weight polymer and increase the viscosity to 0.90-1.10;

[0038] (1) spinning

[0039]The high-viscosity flame-retardant recycled polyester chips obtained after solid-state polymerization are melted into a spinning melt at high temperature in a screw extruder. After static mixing, it is fully mixed during the conveying process, and then sprayed into filaments through the spinning assembly at a pressure of 13-30MPa. The spinning temperature is 275°C, the filament passing temperature is 20±2°C, the humidity is 60±...

Embodiment 2

[0042] Example 2: Production of flame-retardant recycled polyester industrial yarn of 555dtex / 96f

[0043] The process of this example is the same as that of Example 1, the difference is that the high-viscosity flame-retardant recycled polyester chips obtained after solid-state polymerization are melted into a molten spinning melt at a high temperature in a screw extruder, and the temperatures in each zone of the screw are respectively 270°C, 275°C, 270°C, 268°C, 268°C, fully mixed through a static mixer, and then sprayed into filaments through the spinning assembly at a pressure of 13-30MPa, the spinning temperature is 278°C, and the filament passing temperature The temperature is 20±2℃, the humidity is 60±5%, and the constant temperature and humidity air-conditioning wind with a speed of 0.4m / s is used for uniform cooling to form primary fibers; after the primary fibers made in the spinning process are coated with high temperature resistant oil (0.5-1.0%, the meaning is the ...

Embodiment 3

[0044] Example 3: Production of flame-retardant recycled polyester industrial yarn of 2220dtex / 384f

[0045] The process of this example is the same as that of Example 1, the difference is that the high-viscosity flame-retardant recycled polyester chips obtained after solid-state polymerization are melted into a spinning melt at a high temperature in a screw extruder, and the temperature of each zone of the screw is 275°C. , 275°C, 270°C, 270°C, 270°C, fully mixed through a static mixer, and then sprayed into filaments through the spinning assembly at a pressure of 13-30MPa, the spinning temperature is 270°C, and the filament passing temperature is 20± 2°C, humidity 60±5%, constant temperature and humidity air-conditioning wind with a speed of 0.5m / s for uniform cooling to form nascent fibers; 1.0%, the same as above), through 5 pairs of drafting rollers for multi-stage drafting, the speed and corresponding temperature of each pair of drafting rollers are 455m / min, 80°C; 458m / ...

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Abstract

The invention relates to a production method of a phosphorus copolymerization flame-retardant regenerated polyester chip and industrial yarn of the polyester chip, and belongs to the technical field of flame-retardant polyester industrial yarn production. The production method includes: preparation of the flame-retardant regenerated polyester chip, solid polymerization, spinning and drafting heat setting, in particular, the method includes steps of: drying after a polyester waste material is melt to form a bubble material, melting by a screw to form regenerated polyester melt, adding a flame-retardant adjusting agent and a catalyst into the regenerated polyester melt, performing homogenization and polymerization, filtering the melt, granulating to obtain the flame-retardant regenerated polyester chip, spinning after the chip is subjected to solid polymerization for tackifying, and performing drafting heat setting to obtain a finished product. By adoption of the production method, molecular chain end-capping in an esterification reaction is avoided, and the reaction is performed step by step. In addition, the polyester chip is suitable for solid polymerization. The viscosity of the chip can be largely increased and suitable for processing and production of the polyester industrial yarn. By the flame-retardant processing for the regenerated polyester, the waste material is regenerated, and has a novel function, so that the method has a profound meaning.

Description

technical field [0001] The invention relates to a phosphorus-based copolymerized flame-retardant regenerated polyester chip and a production method thereof, belonging to the technical field of flame-retardant polyester industrial yarn production. Background technique [0002] According to the production process and the introduction of flame retardants, the flame retardant modification methods of polyester can be summarized into the following five types: (1) adding reactive flame retardants in the stage of transesterification or polycondensation for co-condensation; (2) in the melt spinning Adding an additive flame retardant to the melt before spinning; (3) Composite spinning of ordinary polyester and polyester containing flame retardant components; (4) Graft copolymerization of reactive flame retardants on polyester or fabric ; (5) Polyester fabrics are subjected to flame-retardant post-treatment. Methods (1) to (3) belong to flame-retardant modification of raw silk, and me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/692D01F6/84D01D5/098C08J11/04
CPCY02P20/143Y02P20/584Y02W30/62
Inventor 王建辉马建平高琳
Owner 浙江金汇特材料有限公司
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