Crude polypropylene fiber for concrete and preparation method thereof

A polypropylene and crude fiber technology, applied in the field of polypropylene fiber and its preparation, can solve the problems of affecting the toughening effect, low tensile strength and elastic modulus, and achieve no deterioration of mechanical properties, avoid thermal and oxygen aging, and improve Economical effect

Inactive Publication Date: 2010-01-20
JIANGSU SUBOTE MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a new type of concrete reinforcement, crude synthetic fiber can improve the toughness of concrete to a certain extent, but it still has the disadvantages of low tensile strength and elastic modulus, which affects its toughening effect.

Method used

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  • Crude polypropylene fiber for concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] VectraA950 was vacuum-dried at 140°C for 10 hours to constant weight for use. And other components were dried to constant weight for later use. Add 5kg of polypropylene slices with a melt index of 5g / 10min into the high-speed mixer, then add 5g of VectraA950, 0.1kg of maleic anhydride grafted polypropylene, 25g of antioxidant 1076, and 5g of ultraviolet absorber UV327, and mix them evenly before transferring the materials Into the hopper of the twin-screw extruder, the set temperature of each zone of the screw is as follows:

[0050] a district

[0051] After the melt is melted, mixed with a static mixer, and filtered by a filter, it is extruded from the circular spinneret hole of the spinneret and cooled in a water bath at 10 ° C. The water bath contains 3.0% conventional polypropylene spinning oil agent HAPP -66 (Jiangsu Hai'an Petrochemical Plant), the fiber after leaving the water bath is drawn 7.0 times on the hot roller at 90°C, then heated in the heat...

Embodiment 2

[0053] The Rodrun LC5000 was vacuum-dried at 130°C for 4 hours to constant weight for use. And other components were dried to constant weight for later use. Add 5kg of polypropylene slices with a melt index of 12g / 10min into the high-speed mixer, then add 0.25kg of dried Rodrun LC5000, 0.1kg of maleic anhydride grafted polypropylene, 7.5g of antioxidant DLTP, and 8g of ultraviolet absorber UV327, After mixing evenly, transfer the material to the hopper of the twin-screw extruder, and set the temperature of each zone of the screw as follows:

[0054] a district

[0055] After the melt is melted, mixed with a static mixer, and filtered by a filter, it is extruded from the regular pentagonal spinneret hole of the spinneret and cooled in a water bath at 12°C. The water bath contains 3.0% conventional polypropylene spinning oil Agent 2038 (Changzhou Lingda Chemicals Co., Ltd.), the fiber after leaving the water bath is drawn 6.0 times on a hot roll at 90°C, then heated ...

Embodiment 3

[0057] Vectra B950 was vacuum-dried at 140°C for 24 hours to constant weight for use. And other components were dried to constant weight for later use. Add 5kg of polypropylene slices with a melt index of 15g / 10min into the high-speed mixer, then add 0.75kg of VectraB950, 0.15kg of acrylic acid grafted polypropylene, 10.0g of antioxidant DLTP, and 7.5g of ultraviolet absorber UV327. After mixing evenly, put the materials Transferred to the twin-screw extruder hopper, the temperature settings for each zone of the screw are as follows:

[0058] a district

[0059] After the melt is melted, mixed with a static mixer, and filtered by a filter, it is extruded from the circular spinneret hole of the spinneret, and cooled in a water bath at 18°C. The water bath contains 3.0% conventional polypropylene spinning oil 2038 (Changzhou Lingda Chemical Co., Ltd.), the fiber after leaving the water bath is drawn 9.0 times on the hot roller at 100°C, then heated in the heating tan...

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Abstract

The invention relates to a crude polypropylene fiber for concrete and a preparation method thereof. The crude polypropylene fiber comprises polypropylene, a thermotropic liquid crystal polymer being 0.1-25 percent by weight of the polypropylene, a compatilizer being 0.1-5.0 percent by weight of the polypropylene, an antioxidant being 0.1-0.5 percent by weight of the polypropylene and an ultraviolet absorption agent being 0.1-0.3 percent by weight of the polypropylene. The preparation method comprises the following steps: drying the polypropylene, the thermotropic liquid crystal polymer and other components to constant weight and then uniformly mixing the components; extruding the dried components by a spinneret plate of a double-screw extruder and then cooling an obtained extruded material in a water bath; stretching the cooled material in different stages for multiple times at a temperature being higher than the vitrification temperature of the polypropylene; spraying a conventional oil agent used for polypropylene spinning on an obtained fiber bundle and carrying out thermal shaping; and then carrying out indentation processing on the surface of the fiber. The thermotropic liquid crystal polymer strengthens the crude polypropylene fiber in the form of a microfiber so as to greatly improve the mechanical property of the crude polypropylene fiber, thereby enhancing or improving the crude polypropylene fiber to enhance the performances of anti-cracking, permeability resistance, breaking resistance, toughness, impact resistance, freezing and thawing resistance, fire resistance, bursting resistance, and the like of the concrete.

Description

technical field [0001] The invention relates to a polypropylene fiber and a preparation method thereof, in particular to a polypropylene crude fiber for concrete and a preparation method thereof. Background technique [0002] Concrete is one of the most widely used and very important building materials, and it is currently developing in the direction of high performance, functionality, and high durability. However, the inherent disadvantages of concrete, such as low tensile strength, high brittleness, poor toughness, and poor resistance to deformation, restrict its development and application. In recent decades, people have used crude synthetic fibers to strengthen concrete, which can achieve crack resistance and toughening, optimize mechanical properties, and improve impact resistance. [0003] According to the size of the fiber diameter, synthetic fibers for concrete can be divided into fine fibers with a diameter of less than 100 microns and thick fibers with a diameter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/46C04B16/06D01D5/098D01D10/02D01D11/00
Inventor 缪昌文刘加平阳知乾刘建忠吕进
Owner JIANGSU SUBOTE MATERIAL
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