High-strength and high-modulus polyvinyl alcohol fiber and melt spinning method of high-strength and high-modulus polyvinyl alcohol fiber

A technology of polyvinyl alcohol fiber and melt spinning, which is applied in the direction of melt spinning, stretch spinning, fiber treatment, etc. It can solve the problems of complex extraction, long production process, high cost, etc., and achieve the effect of simple process

Inactive Publication Date: 2012-11-14
SHANGHAI LUOYANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technique allows for making strong but sturdy materials that can resist damage caused during construction or other uses such as seismic reinforcement. These properties make them ideal candidates for use in building structures where durability against environmental stress factors like rainwater impact should also meet certain standards set forth in various codes worldwide.

Problems solved by technology

This patents describes different ways to make strong or sturdy materials like steel bars, cerams, aluminum hydride hallspaces, laminated fabrics made from these materials, and glass filled epoxy resin composite pipelines. These techniques involve mixing together special types of fibres called metafibrilns, yarn bundles containing multiple twists per unit weight cores, crushing the fibers beforehand without causing damage, while maintaining desired properties over time. Additionally, some existing processes require expensive equipment and consume significant amounts of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-strength high-modulus polyvinyl alcohol fiber and a melt spinning method thereof, comprising the following steps:

[0040] (1) swelling;

[0041] The raw material is polyvinyl alcohol powder or pellets with a degree of polymerization of 800 and a degree of alcoholysis of 60%. Water is used as a plasticizer, and after being fully mixed, it is swelled at 20°C for 4 hours; the weight ratio of polyvinyl alcohol, water and glycerin is 1: 0.3∶0.05;

[0042] (2) Melt spinning;

[0043] Add the swollen polyvinyl alcohol into the twin-screw extruder, fully melt it, pass through the spinning assembly and spray it out from the spinneret with a hole diameter of 0.1mm, and the melt stream is cooled by side blowing to obtain the primary polyvinyl alcohol fiber The temperature in each zone of the screw is: 70°C in the feed section, 90°C in the compression section and 80°C in the metering section, 90°C in the spinning assembly, 80°C in the spinneret, and a spinning speed of 10...

Embodiment 2

[0047] A high-strength high-modulus polyvinyl alcohol fiber and a melt spinning method thereof, comprising the following steps:

[0048] (1) swelling;

[0049] The raw material is polyvinyl alcohol powder or pellets with a degree of polymerization of 2600 and a degree of alcoholysis of 99%. Water is used as a plasticizer. The weight ratio is 1:1.5:0.2;

[0050] (2) Melt spinning;

[0051] The swollen polyvinyl alcohol is added to the steam-tight twin-screw extruder, and the combination of the twin-screw screw elements of the steam-tight twin-screw extruder is sequentially the screw element I, the screw element II and the screw element III. Two cycles, and the threaded element I is connected after the cycle; the main technical parameters of the threaded element of the steam-tight twin-screw extruder are: in the threaded element I, the screw root diameter D 01 = 15mm, screw groove depth h 1 =15mm, thread pitch S 1 =10mm, flight width B 1 = 10mm, 0.3D 01 =h 1 =0.6D 01 , ...

Embodiment 3

[0056] A high-strength high-modulus polyvinyl alcohol fiber and a melt spinning method thereof, comprising the following steps:

[0057] (1) swelling;

[0058] The raw material is polyvinyl alcohol powder or pellets with a degree of polymerization of 1700 and a degree of alcoholysis of 99%. Water is used as a plasticizer. After being fully mixed, it is swelled at 45°C for 2 hours; the weight ratio of polyvinyl alcohol, water and pentaerythritol is 1: 1:0.11;

[0059] (2) Melt spinning;

[0060] Add the swollen polyvinyl alcohol into the twin-screw extruder, fully melt it, pass through the spinning assembly and spray it out from the spinneret with a hole diameter of 0.5mm, and the melt stream is cooled by side blowing to obtain the primary polyvinyl alcohol fiber The temperature of each zone of the screw is: 80°C in the feed section, 120°C in the compression section, and 150°C in the metering section, the temperature of the spinning assembly is 150°C, the temperature of the s...

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Abstract

The invention relates to a high-strength and high-modulus polyvinyl alcohol fiber and a melt spinning method of the high-strength and high-modulus polyvinyl alcohol fiber. The method comprises the following steps that polyvinyl alcohol, water and polyatomic alcohol are subjected to full swelling after being uniformly mixed; the polyvinyl alcohol subjected to the full swelling is added into a double-screw-rod extruding machine and is then subjected to full fusion to be extruded, and melt fine flows form a primary fiber after air blowing cooling; and the prepared primary fiber is subjected to the drying by a hot air drying oven, multistage stretching and tense heat setting to form the polyvinyl alcohol fiber. The preparation method of the prepared polyvinyl alcohol fiber has the advantage that through the hydrogen bond compounding among water molecules, polyatomic alcohol and polyvinyl alcohol molecules, the melt spinning and the high-power stretching of the polyvinyl alcohol are realized. The polyvinyl alcohol fiber prepared by the preparation method has the advantages of fiber degree controllability, high strength and high modulus, and can be widely applied to the field of civil engineering concrete.

Description

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Claims

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Application Information

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Owner SHANGHAI LUOYANG NEW MATERIAL TECH
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