Preparation method of low-shrinkage polyamide 66 industrial yarn

An industrial yarn and low-shrinkage technology, applied in the field of nylon spinning, can solve problems such as low production efficiency and potential safety hazards, and achieve the effects of small tension, low shrinkage, and good electrical insulation

Active Publication Date: 2017-02-01
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 prod

Method used

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  • Preparation method of low-shrinkage polyamide 66 industrial yarn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0033] (1) Transfer nylon 66 chips with an initial moisture content of 3000ppm and an initial relative viscosity of 2.20 to the drying tower, turn on the hot air circulation pump, and set the oxygen content at ≤5ppm and temperature of 145℃ in N 2 Drying and polymerization are carried out under protection, the pressure in the drying tower is 6kPa, the reaction temperature is 145°C, the reaction time is 30h, the water content of the slice after the reaction is 400ppm, and the relative viscosity is 2.60;

[0034] (2) Step (1) The dried nylon chips are subjected to humidity conditioning treatment, and the moisture content and viscosity of the chips are adjusted again, the moisture content of the chips after treatment...

Embodiment 2

[0047] A method for preparing low-shrinkage nylon 66 industrial yarn. The prepared nylon 66 industrial yarn has a heat shrinkage rate of 1.98%, a denier of 840D, a breaking strength of 9.5g / D, and a breaking elongation of 20%. It includes the following steps:

[0048] (1) Transport the nylon 66 chips with the initial moisture content of 3000ppm and the initial relative viscosity of 2.23 to the drying tower, turn on the hot air circulation pump, and set the oxygen content to ≤5ppm and the temperature of 150℃ N 2 Drying and polymerization are carried out under protection, the pressure in the drying tower is 6kPa, the reaction temperature is 150°C, the reaction time is 36h, the water content of the slice after the reaction is 350ppm, and the relative viscosity is 2.60;

[0049] (2) The dried nylon chips in step (1) are subjected to humidity conditioning treatment, and the moisture content and viscosity of the chips are adjusted again.

[0050] The described humidity control step is divi...

Embodiment 3

[0063] A method for preparing low-shrinkage nylon 66 industrial yarn. The prepared nylon 66 industrial yarn has a heat shrinkage rate of 1.95%, a denier of 1890D, a breaking strength of 9.8g / D, and a breaking elongation of 22%. It includes the following steps:

[0064] (1) Transfer nylon 66 chips 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 set the oxygen content at ≤5ppm at a temperature of 150℃ in N 2 Drying and polymerization are carried out under protection, the pressure in the drying tower is 6kPa, the reaction temperature is 150°C, the reaction time is 36h, the water content of the slices after the reaction is 400ppm, and the relative viscosity is 2.70;

[0065] (2) The dried nylon chips in step (1) are subjected to humidity conditioning treatment, and the moisture content and viscosity of the chips are adjusted again. After the treatment, the moisture content of the chips is 450 ppm and...

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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 preparation method of ultra-low shrinkage nylon 66 industrial yarn. Background technique [0002] Nylon 66 industrial yarn has the characteristics of high strength, low unit weight, fatigue resistance, impact resistance, good dimensional stability, friction resistance and easy processing. It is widely used in automobile industries such as tires, automobile airbags, parachutes, tarpaulins, sports In terms of clothing and other textiles, the market prospects are very broad. For example, when applied to airbags, in the event of a crash, under dynamic load, the pressure of the internal belt of the airbag and the local pressure of the surrounding gaps reaches the peak, and the pressure is transmitted to the surface of the fabric. It requires nylon yarn to have the advantages of low modulus and high elongation. Performance to protect the fabric from damage. [0003] However, the development ...

Claims

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Application Information

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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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