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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 very limited, and the price of thermotropic liquid crystal polymers is relatively high, which increases the cost of polypropylene fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step (1). Vacuum dry the attapulgite 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 of The ultraviolet absorber UV-1 is mixed into a 10kg mixture;

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

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

[0047] Step (3). Carrying out indent...

Embodiment 2

[0051] Step (1). The montmorillonite was vacuum-dried at 150°C for 24h; then 9.9kg of polypropylene, 10g of montmorillonite, 70g of acrylic acid grafted polypropylene, 10g of antioxidant 264, and 10g of ultraviolet absorber UV -326 mixed into 10kg mixture;

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

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

[0054] Step (3). Carrying out i...

Embodiment 3

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

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

[0060] The processing temperature of the twin-screw extruder is: feeding section 200°C, plasticizing section 240°C, homogenizing section 260°C, spinneret temperature 270°C, spinneret hole outlet shape is cross-shaped; water-cooled water bath temperature is 30°C; the water bath temperature of hot water drawing is 80°C, and the draw ratio is 4 times; the drawing temperature of the hot roll drawing is 140°C, and the draw ratio is 5 times; the heat setting temperature is 140°C .

[0061] Step (3). Carrying out indentation treatment on the s...

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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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