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Intermittent drafting process of melt spun polyvinyl alcohol fiber

A polyvinyl alcohol fiber, intermittent technology, applied in the direction of stretch spinning, artificial filament cleaning/drying, etc., can solve the problems of non-fiber evaporation consideration and control, etc., and achieve the effect of simple process

Inactive Publication Date: 2015-04-08
SHANGHAI LUOYANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned prior art does not consider and control the evaporation of water in the fiber in the post-spinning processing of the polyvinyl alcohol fiber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The polyvinyl alcohol fibers with a water content of 5% were drawn in three stages. Carry out the first stage drawing in the first drawing hot box, the temperature is controlled at 90 ℃, and the drawing ratio is 3. The moisture content in the first-stage drying heat box is 2%, the temperature is controlled at 10° C., and the moisture content of the polyvinyl alcohol fiber at the outlet of the drying heat box is 3%. Carry out the second stage drawing in the second drawing hot box, the temperature is controlled at 120 ℃, and the draw ratio is 1.4. The moisture content in the second-stage drying heat box is 1%, the temperature is controlled at 20° C., and the moisture content of the polyvinyl alcohol fiber at the outlet of the drying heat box is 1%. The third stage of drawing is carried out in dry hot air, the temperature is controlled at 200°C, and after the third stage of drawing, the draw ratio is 1.2.

[0024] After three-stage drawing as described above, the breakin...

Embodiment 2

[0026] The polyvinyl alcohol fibers with a water content of 7.5% were drawn in three stages. The first stage of drawing is carried out in the first drawing hot box, the temperature is controlled at 94.5°C, and the draw ratio is 4. The moisture content in the first-stage drying heat box is 3%, the temperature is controlled at 15° C., and the moisture content of the polyvinyl alcohol fiber at the outlet of the drying heat box is 4.5%. Carry out the second stage drawing in the second drawing hot box, the temperature is controlled at 130 ℃, and the draw ratio is 1.95. The moisture content in the second-stage drying heat box is 1.5%, the temperature is controlled at 25° C., and the moisture content of the polyvinyl alcohol fiber at the outlet of the drying heat box is 2%. Carry out the third stage drawing in dry hot air, the temperature is controlled at 210 ℃, after the third stage drawing, the draft ratio is 1.6.

[0027] After three-stage drawing as described above, the breakin...

Embodiment 3

[0030] The polyvinyl alcohol fiber with a water content of 10% is drawn in three stages. Carry out the first stage drawing in the first drawing hot box, the temperature is controlled at 99 ℃, and the drawing ratio is 5. The moisture content in the first-stage drying heat box is 4%, the temperature is controlled at 20° C., and the moisture content of the polyvinyl alcohol fiber at the outlet of the drying heat box is 6%. Carry out the second stage drawing in the second drawing hot box, the temperature is controlled at 140 ℃, and the drawing ratio is 2.5. The moisture content in the second-stage drying heat box is 2%, the temperature is controlled at 30° C., and the moisture content of the polyvinyl alcohol fiber at the outlet of the drying heat box is 3%. The third stage of drawing is carried out in dry hot air, and the temperature is controlled at 220°C. After the third stage of drawing, the draw ratio is 2.

[0031] After three-stage drawing as described above, the breaking...

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Abstract

The invention relates to an intermittent drafting process of melt spun polyvinyl alcohol fiber, namely carrying out three-level drafting to the polyvinyl alcohol fiber whose water content is 5 to 10% obtained by drying in melt spun process. The total draft multiple is 5 to 25-fold. After the first-stage and the second-stage drafting process, the first-stage and second-stage drying hot boxes with certain temperature and moisture content are respectively accessed; the third-stage drafting is carried out in the dry hot air under certain temperature. The strength of polyvinyl alcohol fiber obtained by the third-stage drafting is not smaller than 8 cN / dtex and the modulus is not smaller than 25GPa. The method provided by the invention controls the drafting process of the polyvinyl alcohol fiber spinning by controlling the evaporation of water content in the polyvinyl alcohol fiber to obtain the high-performance polyvinyl alcohol fiber. The process technique of the method is simple and the additive is not added. The solvent does not need to be recycled and processed. The environment pollution is small and the production cost is low. The intermittent drafting process of melt spun polyvinyl alcohol fiber can be widely applied to the fields such as the civil engineering and armor protection material.

Description

technical field [0001] The present invention relates to a kind of drawing process of polyvinyl alcohol fiber, especially to a kind of intermittent drawing process of melt-spun polyvinyl alcohol fiber, in particular to a kind of process of controlling poly Evaporation of water content in vinyl alcohol fibers to produce high performance polyvinyl alcohol fibers in the drawing process. Background technique [0002] In order to improve the shortcomings of concrete such as poor tensile performance, crack resistance and poor ductility, the research on adding synthetic fibers to concrete to improve concrete performance has developed quite rapidly. Polyvinyl alcohol high-performance fiber has high strength, good thermal performance, excellent weather resistance and good compatibility with cement concrete, and the reinforcement effect is obvious. However, the polyhydric hydroxyl strong hydrogen bond characteristics of polyvinyl alcohol make its melting point and decomposition temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/16D01D10/06
Inventor 李文刚赵炯心刘国平
Owner SHANGHAI LUOYANG NEW MATERIAL TECH