Preparation method of melt spun high-strength high-modulus polyvinyl alcohol fibers

A polyvinyl alcohol fiber, high-strength and high-modulus technology, which is applied in the preparation of melt-spun high-strength and high-modulus polyvinyl alcohol fibers and the melt-spinning preparation of high-strength and high-modulus polyvinyl alcohol coarse denier fibers, can solve the problems of complex extraction, high cost, and production process flow. Long and other problems, to 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

Problems solved by technology

Therefore, in order to realize the coarse denier of polyvinyl alcohol fibers, there are also certain research results in the melt spinning of polyvinyl alcohol: Chinese patent CN101899722A swells polyvinyl alcohol with water, extrudes after dissolving by a single screw, and passes through the freezing liquid Coagulation forms polyvinyl alcohol fibers, but there are still the disadvantages of long production process and high cost through the c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing melt-spun high-strength and high-modulus polyvinyl alcohol fibers, comprising the following steps:

[0039] (1) swelling;

[0040] 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. After being fully mixed, it is swelled at 20°C for 4 hours; the weight ratio of polyvinyl alcohol to water is 1:0.3;

[0041] (2) Melt spinning;

[0042] 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 10m / min for the as-spun...

Embodiment 2

[0046] A method for preparing melt-spun high-strength and high-modulus polyvinyl alcohol fibers, comprising the following steps:

[0047] (1) swelling;

[0048] 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. After being fully mixed, it is swelled at 60°C for 40 minutes; the weight ratio of polyvinyl alcohol to water is 1:1.5;

[0049] (2) Melt spinning;

[0050] 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 a cycle of screw element I, screw element II, and screw element III. And connect the threaded element I 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 =...

Embodiment 3

[0055] A method for preparing melt-spun high-strength and high-modulus polyvinyl alcohol fibers, comprising the following steps:

[0056] (1) swelling;

[0057] 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 to water is 1:1;

[0058] (2) Melt spinning;

[0059] 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 spinneret is 140°C, and t...

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Abstract

The invention relates to a preparation method of melt spun high-strength high-modulus polyvinyl alcohol fibers. The method comprises the following steps of: mixing polyvinyl alcohol and water uniformly for fully swelling; adding the fully swollen polyvinyl alcohol to a double screw extruder for full fusion and then extrusion, and the fused mass trickle is subjected to air blast cooling to form nascent fibers; and the obtained nascent fibers are subjected to drying by a hot-air oven, multistage drawing and tension heat setting to form polyvinyl alcohol fibers. The preparation method of polyvinyl alcohol fibers provided by the invention has the beneficial effect that as only water is used for plasticization, through hydrogen bond complex formed between water molecules and polyvinyl alcohol molecules, melt spinning and high stretching of polyvinyl alcohol are achieved; the polyvinyl alcohol fibers with excellent mechanical property are prepared from general-grade polyvinyl alcohol; relevant complex process steps of coagulating bath and the like in the traditional wet spinning method are not needed, the production process is simple, and environmental pollution is small, and the production cost is low. The polyvinyl alcohol fiber prepared by the method has the advantages of controllable fiber number, high strength and high modulus, and the fibers can be widely applied to the field of civil work concrete.

Description

technical field [0001] The invention relates to a method for preparing melt-spun high-strength and high-modulus polyvinyl alcohol fibers, in particular to a method for preparing high-strength and high-modulus polyvinyl alcohol fibers used in civil engineering, specifically a high-strength and high-modulus polyvinyl alcohol (PVA) coarse denier Process for producing fibers by melt spinning. 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. At present, there are more researches on polypropylene fiber, polyethylene fiber, nylon fiber, polyester fiber, carbon fiber, aramid fiber, polyvinyl alcohol fiber, etc. Among them, polypropylene monofilament fiber is currently widely used in the market because of its low price, high chemical corrosion resistance, and wide source. ...

Claims

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Application Information

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IPC IPC(8): D01F6/50D01D1/04D01D5/08D01D5/12D01D10/00D01D10/02D01D10/06C04B16/06
Inventor 刘国平赵炯心李文刚
Owner SHANGHAI LUOYANG NEW MATERIAL TECH
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