Crude polypropylene fiber and preparation method thereof

A polypropylene, crude fiber technology, used in fiber processing, fiber chemical characteristics, single-component polyolefin rayon, etc., can solve the problem of limited improvement in concrete toughness and crack resistance, and high price of thermotropic liquid crystal polymers , increase the cost of polypropylene fiber, etc., to achieve the effect of enhancing strength, reducing product cost, and simplifying production process

Inactive Publication Date: 2012-03-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the toughness and crack resistance of concrete by polypropylene fibers modified by the above methods is ve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0043] Example 1:

[0044] Step (1). The attapulgite was vacuum dried at 200°C for 12h; then 8.5kg of polypropylene, 1.0kg of attapulgite, 0.45kg of maleic anhydride grafted polypropylene, 30g of antioxidant 1010, 20g The ultraviolet absorber UV-1 is mixed into a 10kg mixture;

[0045] Step (2). The mixture is extruded through a twin-screw extruder, and is spun from a spinneret, and then subjected to water cooling, hot water drafting, hot roll drafting, and heat setting to form coarse fibers;

[0046] The processing temperature of the twin-screw extruder is 180°C in the feeding section, 220°C in the plasticizing section, 240°C in the homogenizing section, the temperature of the spinneret is 250°C, the outlet shape of the spinneret hole is circular; the temperature of the water-cooled water bath It is 10℃; the water bath temperature of hot-water drawing is 60℃, and the drafting ratio is 2 times; the drafting temperature of the hot roll drafting is 150℃, and the drafting ratio is 6 ti...

Example Embodiment

[0050] Example 2:

[0051] Step (1). Dry the montmorillonite in vacuum at 150°C for 24 hours; then 9.9 kg of polypropylene, 10 g of montmorillonite, 70 g of acrylic grafted polypropylene, 10 g of antioxidant 264, and 10 g of ultraviolet absorber UV -326 is mixed into a 10kg mixture;

[0052] Step (2). The mixture is extruded through a twin-screw extruder, and is spun from a spinneret, and then subjected to water cooling, hot water drafting, hot roll drafting, and heat setting to form coarse fibers;

[0053] The processing temperature of the twin-screw extruder is: feeding section 185°C, plasticizing section 230°C, homogenizing section 250°C, the spinneret temperature is 260°C, the outlet shape of the spinneret hole is oval; water-cooled bath temperature It is 20°C; the temperature of the hot water bath is 70°C, and the drawing ratio is 2 times; the drawing temperature of the hot roll drawing is 130°C, and the drawing ratio is 2 times; the heat setting temperature is 130°C .

[0054]...

Example Embodiment

[0057] Example 3:

[0058] Step (1). Dry the zeolite in vacuum at 160°C for 15 hours; then mix 9.8 kg of polypropylene, 100 g of zeolite, 50 g of acrylamide grafted polypropylene, 20 g of antioxidant 168, and 30 g of ultraviolet absorber UV-327. Into a 10kg mixture;

[0059] Step (2). The mixture is extruded through a twin-screw extruder, and is spun from a spinneret, and then subjected to water cooling, hot water drafting, hot roll drafting, and heat setting to form coarse fibers;

[0060] The processing temperature of the twin-screw extruder is: 200°C in the feeding section, 240°C in the plasticizing section, 260°C in the homogenization section, the temperature of the spinneret is 270°C, and the outlet shape of the spinneret hole is cross-shaped; water-cooled bath temperature The temperature of the water bath for hot-water drawing is 80°C, and the drawing ratio is 4 times; the drawing temperature of the hot roll drawing is 140°C, and the drawing ratio is 5 times; the heat setting ...

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Abstract

The invention relates to a crude polypropylene fiber and a preparation method thereof. The crude polypropylene fiber provided by the invention is a mixture consisting of 85-99% (weight percent) of polypropylene, 0.1-10% of inorganic packing, 0.5-5% of a compatibilizer, 0.1-0.5% of antioxidant and 0.1-0.3% of ultraviolet absorber, and the surface of the crude polypropylene fiber is in the shape of waves or bamboo joints. The preparation method comprises the following steps of: firstly, drying the inorganic packing until the inorganic packing is constant in weight; then, mixing the inorganic packing with the other materials in certain proportion to obtain a mixed material; extruding the mixed material by a twin-screw extruder, and spinning by a spinneret plate; sequentially carrying out water cooling, hot-water drafting, hot-roller drafting and thermoforming on the obtained product to obtain a crude fiber; and finally, carrying out surface creasing treatment on the crude fiber. In the method disclosed by the invention, the polypropylene is modified by using the low-price inorganic packing to obtain a high-strength and high-modulus polypropylene crude fiber, thereby enhancing the strength of concrete and prolonging the service life of the concrete. In the invention, modification and spinning processes are completed in a step, thereby facilitating simplification of a production process and reduction of the product cost.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a polypropylene crude fiber and a preparation method thereof, in particular to a polypropylene crude fiber for reinforcing concrete and a preparation method thereof. Background technique [0002] Concrete is currently the largest and most widely used building material, and its application range includes airports, dams, bridges, railways, ports, houses, roads and other occasions with different stress characteristics and performance requirements. Concrete has high compressive strength, but low tensile strength, high brittleness, easy cracking, and poor toughness. Therefore, improving the durability of concrete and prolonging its service life is the development direction of concrete. [0003] In order to increase the tensile strength of concrete, various fibers are widely mixed with concrete. Fiber products used in concrete reinforcement must have high alkali resistance, g...

Claims

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Application Information

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IPC IPC(8): D01F6/46D01F1/10D01D5/088D01D5/12D01D10/02D01D4/02
Inventor 付俊程亚军魏星肖颖邵仕军
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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