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Reinforced modified polypropylene coarse fiber for concrete and its preparing method

A polypropylene and reinforced technology, which is applied in the field of polypropylene fiber and its preparation, can solve the problems of easy flying of thin fibers, etc., and achieve the effects of strong grip, improved tensile strength, and improved tensile strength

Inactive Publication Date: 2005-10-19
ZHONGFANG XIANJIAN SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And in terms of construction, fine fibers are easy to fly away during the dry mixing and dry spraying of shotcrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The isotactic homopolypropylene chips with melt index MI=12g / 10min are fed into the single-screw extruder from the hopper; Chemical Co., Ltd.) to account for the weight fraction of 2.5% of the polypropylene addition, and the solubilizer maleic anhydride grafted polypropylene to account for the weight fraction of 4% of the polypropylene addition, and feed the single-screw extruder into the self-propelled disc metering device, The fed mixture is extruded by a screw extruder, mixed by a static mixer, and filtered by a pre-filter. The temperature of the extruded melt is controlled at 230°C. After metering by a metering pump, it is sprayed from a dumbbell-shaped filament with a length-to-diameter ratio of 1 / 4. The porous spinneret with holes is extruded, and enters a water bath at 20°C to cool and solidify to form. After leaving the water bath, the as-spun silk is drawn 5.1 times in a hot water bath at 70°C, then drawn 1.5 times by a hot plate at 140°C, and 1.2 times by a ho...

Embodiment 2

[0055] Others are the same as in Example 1, the difference is that each raw material component of the crude fiber is: melt index MI=20g / 10min polypropylene, poly-4-vinylpyridine (produced from Beijing Zhongfang Chemical Industry Co., Ltd.) accounting for 10% of the polypropylene addition Co., Ltd.) and acrylic acid grafted polypropylene accounting for 6% of the polypropylene addition.

[0056] The extrusion melt temperature is controlled at 220°C, the aspect ratio of the spinneret is 1 / 5, and the shape can be flat spinneret holes.

[0057] The first-stage drafting adopts a 65°C hot water bath, and the drafting ratio is 7.2 times. After that, it is drawn 2.5 times by a hot plate at 130°C, 1.5 times by a hot roller at 140°C, and drawn by a hot roller at 145°C. Winding after 1.2 times.

[0058] The surface treatment agent solution is an aqueous solution of 15% sodium lauryl phosphate.

[0059] The monofilament fineness of gained thick fiber is 1600 deniers, the fiber of equival...

Embodiment 3

[0062] Others are the same as in Example 1, and the difference is that each raw material component of the crude fiber is: melt index MI=2g / 10min polypropylene, polyethylenediamine-propylene oxide (produced from Beijing Zhonghua Polypropylene) which accounts for 12% of the polypropylene addition. Textile Chemical Co., Ltd.) and vinyl monomer copolymers containing quaternary ammonium salts (produced by Beijing China Textile Chemical Co., Ltd.) accounting for 8% of polypropylene addition.

[0063] The extrusion melt temperature is controlled at 250°C, the aspect ratio of the spinneret is 1 / 3, and the shape is trilobal.

[0064] The first stage of drawing adopts 85°C hot water bath, and the draw ratio is 8.3 times. After that, it is drawn 3 times by a hot plate at 150°C before winding.

[0065] The surface treatment agent solution is an aqueous solution of 5% sodium octyl phosphate.

[0066] The monofilament fineness of the obtained thick fiber is 64 deniers, the fiber of equival...

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Abstract

The concrete reinforcing modified coarse polypropylene fiber has titer of 64-9300 denier, equivalent diameter of 0.1-1.2 mm, tensile strength of 280-500 MPa, elastic modulus of 3800-5000 MPa, and limit extension of 15-30 %, and is surface convex and concave thread treated before curing. The concrete reinforcing modified coarse polypropylene fiber is prepared with polymer with hydrophilic radical and polypropylene resin, and through mixing, melting, spinning and surface convex and concave thread treatment before curing. It has great grasping force on concrete, and may be used to improve the toughness, impact strength, cracking performance, antiseepage, bending and comprehensive performance of concrete.

Description

technical field [0001] The invention relates to a polypropylene fiber and a preparation method thereof, in particular to a reinforced modified polypropylene crude fiber for concrete and a preparation method thereof. Background technique [0002] As an excellent civil construction material, cement concrete has been used for more than 170 years. In order to improve its performance and overcome the shortcomings of low tensile strength, large shrinkage deformation, brittleness, and inflexibility, there have been various well-known method, but still cannot meet the requirements of the rapid development of today's civil engineering industry. In the mid-1960s, in order to solve the problem of freezing and brittle damage to the concrete enclosure structure of the Nordic coal mine mouth, Europe successively studied and evaluated more than ten kinds of fiber materials used in cement concrete, and achieved a lot of results. [0003] There are two types of fibers that can be used for c...

Claims

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Application Information

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IPC IPC(8): C04B16/06D01F6/46
Inventor 史小兴孙玉山吴宏仁寇书毅任学文王新民金剑李影刘丽君崔津
Owner ZHONGFANG XIANJIAN SCI & TECH BEIJING
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