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Test method for rheological property of fiber-grade nylon 6 slice melt

A test method and fiber-grade technology, applied in the field of preheating treatment of fiber-grade nylon 6 chips and rheological property testing, which can solve the problems of rheological data fluctuation and poor data repeatability, etc.

Inactive Publication Date: 2014-01-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a test method for the rheological behavior of fiber-grade nylon 6 slice melt, which solves the problem of large fluctuations in rheological data and poor data repeatability in the previous test process question

Method used

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  • Test method for rheological property of fiber-grade nylon 6 slice melt
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Embodiment 1

[0024] 1) Preheat the fiber-grade nylon 6 slices; specifically: Weigh a certain weight slice and place it in a weighing dish with a ground mouth, and then dry it in a vacuum drying oven. The temperature of the vacuum drying oven is higher than that of fiber-grade nylon. 6 The glass transition temperature of the slices, the oven temperature is 115°C; the time in the oven is 17h;

[0025] 2) Put the preheated fiber-grade nylon 6 slices into vacuum drying, measure the moisture content, and the moisture content is 220ppm;

[0026] 3) The rheological properties of fiber-grade nylon 6 chip melts were measured by a capillary rheometer, the melting time was 5 minutes, and the test was repeated three times;

[0027] 4) Calculating the shear viscosity of fiber-grade nylon 6 slices, the rheological data obtained have less fluctuation and better repeatability, with a standard deviation of 0.068.

Embodiment 2

[0029] 1) Preheat the fiber-grade nylon 6 slices; specifically: weigh a certain weight of slices and place them in a weighing dish with a ground mouth, and then dry them in a vacuum drying oven. The temperature of the vacuum drying oven is higher than that of fiber-grade nylon. 6 The glass transition temperature of the slices, the oven temperature is 80°C; the time in the oven is 15h;

[0030] 2) Put the preheated fiber-grade nylon 6 slices into vacuum drying, measure the moisture content, and the moisture content is 500ppm;

[0031] 3) The rheological properties of fiber-grade nylon 6 chip melts were measured by capillary rheometer, the melting time was 5 minutes, and the test was repeated three times;

[0032] 4) Calculate the shear viscosity of fiber-grade nylon 6 slices. The obtained rheological data fluctuates greatly, and the repeatability is poor, with a standard deviation of 12.478.

Embodiment 3

[0034] 1) Preheat the fiber-grade nylon 6 slices; specifically: weigh a certain weight of slices and place them in a weighing dish with a ground mouth, and then dry them in a vacuum drying oven. The temperature of the vacuum drying oven is higher than that of fiber-grade nylon. 6 The glass transition temperature of the slices, the oven temperature is 115°C; the time in the oven is 15h;

[0035] 2) Put the preheated fiber-grade nylon 6 slices into vacuum drying, measure the moisture content, and the moisture content is 229ppm;

[0036] 3) The rheological properties of fiber-grade nylon 6 chip melts were measured by a capillary rheometer, the melting time was 20 minutes, and the test was repeated three times;

[0037] 4) Calculate the shear viscosity of fiber grade nylon 6 slices, the obtained rheological data fluctuates greatly, the repeatability is poor, and the standard deviation is 8.246.

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Abstract

The invention discloses a test method for rheological property of a fiber-grade nylon 6 slice melt. The test method comprises the following steps: (1) preheating the fiber-grade nylon 6 slice; (2) measuring the water content of the preheated fiber-grade nylon 6 slice; (3) measuring the apparent shear rate and the apparent shear stress of the fiber-grade nylon 6 slice melt through a capillary rheometer; (4) checking to obtain a real apparent shear rate and a real apparent shear stress; (5) calculating the real apparent shear viscosity of the fiber-grade nylon 6 slice melt. Through the test method for the rheological property of the fiber-grade nylon 6 slice melt, the problems that the nylon 6 is easy to degrade, the experimental results fluctuate seriously and the reproducibility of experimental data is poor in the previous test process for the rheological property of the fiber-grade nylon 6 slice melt are solved.

Description

technical field [0001] The invention belongs to the technical field of testing the rheological properties of fiber-grade slice melts, and more specifically relates to the preheating treatment of fiber-grade nylon 6 slices and the rheological property testing method. Background technique [0002] Polyamide fiber (nylon) was developed in 1938. It is the earliest synthetic fiber developed and industrialized in the world. It has a wide range of uses and its output is second only to polyester fiber. It is the second largest synthetic fiber variety. Polycaprolactam (nylon 6) is one of the main varieties of polyamides. Nylon 6 filament has good wear resistance, strength and elastic recovery, and is a good raw material for high-grade textiles. In recent years, the demand for slices for civil high-speed spinning has been strong, maintaining high-speed growth. But for a long time, the raw material quality of PA6 fiber has been significantly different from that of foreign countries in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/04
Inventor 李超袁晓燕
Owner TIANJIN UNIV