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A kind of preparation method of low-shrinkage nylon 66 industrial yarn

An industrial yarn and low-shrinkage technology, which is applied in the field of nylon spinning, can solve the problems of safety hazards and low production efficiency, and achieve the effects of low shrinkage, good electrical insulation, and ensuring smoothness and toughness

Active Publication Date: 2018-09-07
中维化纤股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of nylon 66 industrial yarn on the market is generally around 8.8-9.0g / D, and the dry heat shrinkage rate is only 4%-7%. There are certain safety hazards during use, and the production efficiency is relatively low. Therefore, It is urgent to develop a high-strength and low-shrinkage nylon 66 industrial yarn and its high-efficiency and high-quality preparation method

Method used

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  • A kind of preparation method of low-shrinkage nylon 66 industrial yarn

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Effect test

Embodiment 1

[0032]A preparation method of low-shrinkage nylon 66 industrial yarn, the thermal shrinkage rate of the prepared nylon 66 industrial yarn is 2%, the denier is 100D, the breaking strength is 9.2g / D, and the breaking elongation is 19%. Include the following steps:

[0033] (1) Transport nylon 66 slices with an initial moisture content of 3000ppm and an initial relative viscosity of 2.20 to the drying tower, turn on the vacuum pump, and dry them in N with an oxygen content of ≤5ppm and a temperature of 145°C. 2 Drying and polymerization reaction are carried out under protection, the pressure inside the drying tower is 6kPa, the reaction temperature is 145°C, the reaction time is 30h, the moisture content of the slice after reaction is 400ppm, and the relative viscosity is 2.60;

[0034] (2) The polyamide fiber 66 slice after step (1) drying is carried out humidity-conditioning treatment, regulates the moisture content and the viscosity of slice again, and the moisture content of ...

Embodiment 2

[0047] A preparation method of low-shrinkage nylon 66 industrial yarn, the thermal shrinkage rate of the prepared nylon 66 industrial yarn is 1.98%, the denier is 840D, the breaking strength is 9.5g / D, and the breaking elongation is 20%. Include the following steps:

[0048] (1) Transport nylon 66 slices with an initial moisture content of 3000ppm and an initial relative viscosity of 2.23 to the drying tower, turn on the vacuum pump, and dry them in N with an oxygen content of ≤5ppm and a temperature of 150°C. 2 Drying and polymerization reaction are carried out under protection, the pressure inside the drying tower is 6kPa, the reaction temperature is 150°C, the reaction time is 36h, the moisture content of the slice after reaction is 350ppm, and the relative viscosity is 2.60;

[0049] (2) The nylon 66 slice dried in step (1) is subjected to humidity-conditioning treatment, and the moisture content and viscosity of the slice are adjusted again. The slices are sent to the hu...

Embodiment 3

[0062] A preparation method of low-shrinkage nylon 66 industrial yarn, the thermal shrinkage rate of the prepared nylon 66 industrial yarn is 1.95%, the denier is 1890D, the breaking strength is 9.8g / D, and the breaking elongation is 22%. Include the following steps:

[0063] (1) Transport nylon 66 slices with an initial moisture content of 5000ppm and an initial relative viscosity of 2.26 to the drying tower, turn on the vacuum pump, and dry them in N at an oxygen content of ≤5ppm and a temperature of 150°C. 2 Drying and polymerization reaction are carried out under protection, the pressure inside the drying tower is 6kPa, the reaction temperature is 150°C, the reaction time is 36h, the moisture content of the slice after reaction is 400ppm, and the relative viscosity is 2.70;

[0064] (2) The polyamide fiber 66 slice after step (1) drying is carried out humidity-conditioning treatment, regulates the moisture content and the viscosity of slice again, and the moisture content ...

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Abstract

Provided is a preparation method of low-shrinkage polyamide 66 industrial yarn. The preparation method comprises the following steps that 1, slices enter a drying tower to be dried so as to be tackified; 2, the treated slices are subjected to humidifying treatment till the optimal moisture content and viscosity are achieved; 3, the treated slices enter a screw extruder to be heated, and melt is obtained; 4, the melt enters a spinning component, and after metering is conducted through metering pumps and filtering is conducted through filter devices, spinning is conducted through a spinneret plate under high pressure; 5, melt trickles sprayed by the spinneret plate enter a spinning channel to be cooled to form tows; 6, after cooling is conducted, the tows are oiled through an oiling roller; 7, six pairs of hot rollers conduct drafting and shaping on the tows; 8, the tows obtained after being drafted and shaped are subjected to winding on an eight-head winding device. The preparation method is high in winding efficiency and low in breakage rate, the hot-shrinkage rate of the prepared polyamide 66 industrial yarn is lower than or equal to 2%, the denier ranges from 100 D to 1,890 D, the breaking strength is higher than or equal to 9.2 g / D, and the elongation at break becomes 18%-22%.

Description

technical field [0001] The invention relates to the field of nylon spinning, in particular to a method for preparing low-shrinkage nylon 66 industrial yarn. Background technique [0002] Nylon 66 industrial yarn is widely used in tires, automobile airbags and other automotive industries, parachutes, tarpaulins, sports In terms of textiles such as clothing, the market prospect is very broad. For example, when applied to airbags, when a car crash occurs, under dynamic load, the pressure will be transmitted to the surface of the fabric when the local pressure of the inner belt of the airbag and the surrounding gaps reaches a peak, which requires nylon yarns to have excellent properties of low modulus and high elongation. performance, thereby protecting the fabric from damage. [0003] But at present, the development of nylon 66 industrial yarn in our country is relatively late, and the production technology needs to be improved to meet the increasing market demand. The stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D1/04D01D1/10D01D4/02D01D5/08D01D5/088D01D5/16D01D7/00D01D10/02D01F6/60
CPCD01D1/04D01D1/106D01D4/02D01D5/08D01D5/088D01D5/16D01D7/00D01D10/02D01F6/60
Inventor 张浩杰王生健胡博陈海涛徐建国王新民张静王小丰
Owner 中维化纤股份有限公司
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