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Centre blowing cooling solidification process method for preparing polyvinyl alcohol fibre

A polyvinyl alcohol fiber, air blowing cooling technology, applied in fiber processing, textiles and papermaking, filament/thread forming, etc., can solve the problem of not controlling the water content of polyvinyl alcohol primary fiber, and avoid the temperature of the board surface and Effect of filament tension, high heat transfer coefficient, and stable fiber formation

Inactive Publication Date: 2012-07-25
SHANGHAI LUOYANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not provide specific and comprehensive instructions on cooling wind speed, rheumatism and temperature. These process conditions have a significant impact on the fineness, strength and evenness of the as-spun fiber, and the above-mentioned process does not achieve the purpose of controlling the moisture content of the polyvinyl alcohol as-spun fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Swell polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 88% and water in an airtight container under stirring, wherein water accounts for 30% of the total mass of the two. The fully swollen polyvinyl alcohol is spun with a twin-screw extruder. The melt is sprayed from the spinneret and cooled by the central air blowing. m, bundled after cooling to obtain polyvinyl alcohol primary fibers with a water content of 22%.

Embodiment 2

[0024] Polyvinyl alcohol with a degree of polymerization of 2600 and a degree of alcoholysis of 99% and water are swelled in an airtight container under stirring, wherein water accounts for 60% of the total mass of the two. The fully swollen polyvinyl alcohol is spun with a twin-screw extruder, the melt is sprayed out from the spinneret, and cooled by the central air blowing, the wind speed is 4m / s, the air temperature is 25°C, the humidity is 65%, and the central air blowing height is 1.5m , bundled after cooling to obtain polyvinyl alcohol primary fibers with a water content of 30%.

Embodiment 3

[0026] Swell polyvinyl alcohol with a degree of polymerization of 2000 and a degree of alcoholysis of 99% and water in a closed container under stirring, wherein water accounts for 45% of the total mass of the two. The fully swollen polyvinyl alcohol is spun with a twin-screw extruder, and the melt is sprayed out from the spinneret and cooled by the central air blowing at a wind speed of 1.7m / s, an air temperature of 22°C, a humidity of 55%, and a central air blowing height of 0.8 m, bundled after cooling to obtain polyvinyl alcohol primary fibers with a water content of 16%.

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Abstract

The invention relates to a centre blowing cooling solidification process method for preparing polyvinyl alcohol fiber. The method has the characteristics that the centre blowing cooling technique to cool a polyvinyl alcohol melt extruded from a spinneret plate in a melt spinning is adopted; by controlling various centre blowing process parameters, the centre blowing wind speed is 0.8 to 4m / s, the air temperature is 20 to 25 degrees centigrade, the humidity is 40 to 65%, and the centre blowing height is 0.3 to 1.5m, therefore, the cooling efficiency of a filament tow is effectively improved, the spun raw filament is uniformly cooled, the stability of spinning is improved, the spinning flaw is lowered and the uniformity of spun fiber section is improved, and the water content of spun fibers can be controlled effectively, so that high stretching is realized to manufacture high-performance polyvinyl alcohol fiber which has uniform strength and fineness and high modulus and is suitable for being used as the reinforcing material in concrete.

Description

technical field [0001] The invention relates to a central blowing cooling and solidification process for preparing polyvinyl alcohol fibers, in particular to a central blowing cooling and solidification process for controlling the water content of polyvinyl alcohol in the preparation of polyvinyl alcohol fibers. Background technique [0002] Polyvinyl alcohol fiber is low in price, low in density, high in cohesive force, good in dispersion, and easy to stir; compared with other synthetic fibers, polyvinyl alcohol fiber has good hydrophilicity, high elastic modulus, and high specific surface area. Cement concrete has good compatibility and is suitable for reinforcing materials in concrete to improve the characteristics of poor tensile performance, poor crack resistance and poor ductility of concrete, and the reinforcement effect is obvious. [0003] The cooling and solidification process is an important link in the spinning process of polyvinyl alcohol. Before the thin stream...

Claims

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Application Information

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IPC IPC(8): D01D5/088
Inventor 袁建球龚建兴李文刚赵炯心刘国平
Owner SHANGHAI LUOYANG NEW MATERIAL TECH
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