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High-strength heat-resistant PA66 undrawn yarn and production process thereof

An undrawn yarn, PA66 technology, applied in the spinning field, can solve the problems of low breaking strength and elongation at break, affecting product quality and production rate, and uneven denier, so as to reduce broken ends and solve the problem of filament Jump out of the problem, the effect of uniform fineness

Inactive Publication Date: 2016-11-16
山东合信科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The breaking strength and elongation at break are both low;
[0005] (2) Poor heat resistance;
[0006] (3) The index is unstable and the fineness is uneven;
[0008] (5) The angle and position of the thread pressing rod under the oil nozzle are automatically changed during use, and the thread is easy to jump out of the oil nozzle, and oil-free threads often appear, which affects product quality and production rate

Method used

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  • High-strength heat-resistant PA66 undrawn yarn and production process thereof
  • High-strength heat-resistant PA66 undrawn yarn and production process thereof
  • High-strength heat-resistant PA66 undrawn yarn and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 A production process of high-strength heat-resistant PA66 undrawn yarn

[0047] Include the following steps:

[0048] (1) Raw material selection

[0049] Slice with PA66 resin, viscosity 2.65-3.1;

[0050] The resin slices have an oxidation index (YI) ≤ -2, a moisture content (ppm) ≤ 3000, and the appearance requirements do not allow obvious black grains, super long and sticky slices.

[0051] (2) dry

[0052] The slices were dried with a VC352 drum; the drying process was as follows: the drying temperature was 125°C, the drying time was 5.3 hours, the drying vacuum was -0.082MPa, and the moisture content of the slices was dried to 650ppm.

[0053] (3) extrusion melting

[0054] The temperature of the spinning melt is 290°C, and a screw extruder is used for extrusion melting. The extrusion melting parameters are shown in Table 1 below.

[0055] Table 1 Parameters of extrusion melting

[0056]

[0057] (4) Assembly of components

[0058] Add 150-mesh ...

Embodiment 2

[0071] Example 2 A production process of high-strength heat-resistant PA66 undrawn yarn

[0072] On the basis of Example 1, only the parameters of steps (2), (3), (5), and (6) are changed, and the rest are the same as in Example 1, and the changes are as follows:

[0073] (2) dry

[0074] The slices were dried with a VC352 drum; the drying process was as follows: the drying temperature was 113°C, the drying time was 5 hours, the drying vacuum was -0.079MPa, and the moisture content of the slices was dried to 600ppm.

[0075] (3) extrusion melting

[0076] The temperature of the spinning melt is 286°C, and a screw extruder is used for extrusion melting. The extrusion melting parameters are shown in Table 2.

[0077] Table 2 Parameters of extrusion melting

[0078]

[0079] (5) Spinning, cooling and forming

[0080] Component preheating temperature: 314°C, metering pump specification: 2.4ml / r×2, metering pump speed: 22.4 rpm, side blowing wind speed 1.24 m / s, side blowing...

Embodiment 3

[0083] Example 3 A production process of high-strength heat-resistant PA66 undrawn yarn

[0084] On the basis of Example 1, only the parameters of steps (2), (3), (5), and (6) are changed, and the rest are the same as in Example 1, and the changes are as follows:

[0085] (2) dry

[0086] The slices were dried with a VC352 drum; the drying process was as follows: the drying temperature was 117°C, the drying time was 5.2 hours, the drying vacuum was -0.081MPa, and the moisture content of the slices was dried to 625ppm.

[0087] (3) extrusion melting

[0088] The temperature of the spinning melt is 297°C, and the extrusion melting is carried out by using a screw extruder. The extrusion melting parameters are shown in Table 3 below.

[0089] Table 3 Parameters of extrusion melting

[0090]

[0091] (5) Spinning, cooling and forming

[0092] Component preheating temperature: 319°C, metering pump specification: 2.4ml / r×2, metering pump speed: 23.2 rpm, side blowing wind spee...

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Abstract

The invention provides a high-strength heat-resistant PA66 undrawn yarn. The denier of the undrawn yarn is 230+ / -20 dtex. The invention further provides a production process for the high-strength heat-resistant PA66 undrawn yarn. The production process comprises the steps of spinning, cooling and forming, wherein the assembly preheating temperature in the steps of spinning, cooling and forming is 314 to 325 DEG C, and the rotating speed of a metering pump is 22.4 to 23.6 rpm. The denier of the PA66 undrawn yarn produced by the production process is 230+ / -20 dtex; the physical indexes of the PA66 undrawn yarn produced by the production process are that: the breaking strength is 400 to 460 cN, the strength CV is 5.5 to 8 percent, the breaking elongation is 230 to 290 percent, and the breaking elongation CV is 5.0 to 8 percent; the heat-resistance indexes of the PA66 undrawn yarn produced by the production process are that (240 DEG C, 4 minutes): the breaking strength is reduced by 12 to 18 percent, and the breaking elongation is reduced by 12.1 to 19 percent.

Description

technical field [0001] The invention provides a high-strength heat-resistant PA66 unstretched yarn and its production process, which can be used for 20 high-strength elastic weft yarn cores and belongs to the technical field of spinning. Background technique [0002] The scientific name of nylon (PA) fiber is polyamide (polyamide) fiber, which was originally the trade name of polyhexamethylene adipamide produced by DuPont, commonly known as Nylon 66 (Nylon 66). Polyamide fiber is the first commercial synthetic fiber product of synthetic high molecular polymer. It was invented by Carothers of DuPont Company in the United States in 1937. Opened the first pages of synthetic fibers, which are still representative of polyamide fibers today. [0003] PA66 unstretched yarn can be used for 20 elastic weft yarn cores, and is further used to produce tire cord fabrics. The prior art has the following deficiencies when spinning PA66 unstretched yarn: [0004] (1) The breaking strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/08D01D1/00D01D1/09D01D1/10D01D4/02D01D5/088D01D5/096D01D7/00
CPCD01D5/08D01D1/00D01D1/09D01D1/106D01D4/02D01D5/088D01D5/096D01D7/00
Inventor 李国栋
Owner 山东合信科技股份有限公司
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