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Modified polypropylene crude fiber used for reinforcing concrete and preparation method

A technology for reinforcing concrete and polypropylene, which is applied in the field of fibers, can solve the problems of large local water ash, affecting the effect of fiber reinforcement, and unable to fully wrap fibers, etc., to achieve the effect of reducing air bubbles

Active Publication Date: 2016-02-10
宁波时科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive hydrophilic polymers will cause water film aggregation on the surface of the fiber, resulting in excessive local water-cement ratio, and the concrete substrate cannot fully wrap the fiber, thus affecting the reinforcing effect of the fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 98% isotactic polypropylene with a melt index of 3.5dg / min and maleic anhydride grafted polypropylene accounting for 5% of the added amount of polypropylene are fed into the single-screw extruder through a self-propagating disc metering device, and the fed mixture After being extruded by a single-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 extruded from a porous spinneret and enters a water bath to cool and solidify for molding. After the fiber is stretched, drawn and thermally stabilized, the surface of the fiber is indented, and the end of the fiber is enlarged.

[0027] The fiber length is 50mm and the cross-sectional area is 0.6mm 2 , tensile strength 600MPa, elastic modulus 10GPa. The wetting angle is 5 degrees, and it has good hydrophilic performance. 8kg / m 3 The fiber-reinforced disc, according to ASTM C1550, is tested to have an ene...

Embodiment 2

[0029] 99% isotactic polypropylene with a melt index of 2dg / min and silane coupling agent Si-69 accounting for 5% of the added amount of polypropylene are fed into the single-screw extruder through a self-propagating disc metering device, and the fed compound is passed through Extruded by a single-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 extruded from a porous spinneret and enters a water bath to cool and solidify for molding. After the fiber is stretched, drawn and thermally stabilized, the surface of the fiber is indented, and there is no end treatment.

[0030] The fiber length is 60mm and the cross-sectional area is 0.7mm 2, tensile strength 550MPa, elastic modulus 9GPa, due to chemical cross-linking, it has a strong combination with concrete. 6kg / m 3 The fiber-reinforced disc, according to ASTM C1550, is tested to have an energy absorptio...

Embodiment 3

[0032] 97% isotactic polypropylene with a melt index of 3.5dg / min, talcum powder accounting for 20% of polypropylene loading, antioxidant 5% of polypropylene loading and dispersing agent accounting for 15% of talc powder, via autobiography The disc metering device is fed into the twin-screw extruder. The fed compound is extruded by the single-screw extruder, mixed by a static mixer, and filtered by a pre-filter. The temperature of the extruded melt is controlled at 230°C. , extruded from a porous spinneret, cooled and solidified in a water bath. After the fiber is stretched, drawn and thermally stabilized, the surface of the fiber is smooth and there is no end treatment.

[0033] The fiber length is 55mm and the cross-sectional area is 1.0mm 2 , tensile strength 400MPa, modulus of elasticity 11GPa, due to chemical cross-linking, has a strong combination with concrete. 6kg / m 3 The fiber-reinforced disc, according to ASTM C1550, is tested to have an energy absorption of 450J ...

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Abstract

The invention provides modified polypropylene crude fiber used for reinforcing concrete, and belongs to the technical field of fiber. The modified polypropylene crude fiber is prepared by conducting melt blending and stretching on isotactic polypropylene and modified filler accounting for 0.1-40% of the weight of polypropylene. The modified filler is prepared from an organic modification agent, a coupling agent and inorganic modification filler. The modified polypropylene crude fiber is used for inorganic modified filler, antioxidant and dispersing agents, degradation of polypropylene is prevented, and dispersion of filler is improved. The preparation method includes the steps of adding polypropylene and modified filler in an extruder from different filler openings according to the proportion to be subjected to melt extrusion, the mixture is cooled in a water bath after being extruded out of a spinneret plate of the extruder, conducting thermal stability on fiber after polypropylene fiber is pulled and stretched, and conducting surface postprocessing, cut-off and packaging on fiber. According to the polypropylene crude fiber prepared through the method, silicon oxide groups or hydrophilic groups contained in modified filler can be subjected to chemical cross linking together with concrete, the interface bonding between the fiber and concrete is greatly improved, and the reinforcement effect of the fiber is improved.

Description

technical field [0001] The invention relates to a polypropylene fiber, in particular to a modified polypropylene crude fiber for reinforced concrete and a preparation method thereof, belonging to the field of fiber technology. Background technique [0002] Concrete is the most widely used building material in the world. Concrete has high compressive strength, but its tensile strength is very low, which leads to the disadvantages of high brittleness, poor toughness, and poor deformation resistance of concrete. To compensate for concrete's lack of tensile strength, steel bars are often used to reinforce concrete. In addition to steel bars, various fibers such as steel fibers, plant fibers, glass fibers, synthetic fibers are also used to increase the tensile strength and toughness of concrete. [0003] Polypropylene coarse fiber, as a synthetic fiber, has gradually begun to be used in shotcrete for mines and tunnel linings, light traffic concrete pavement and precast concrete...

Claims

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Application Information

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IPC IPC(8): D01F6/46D01F1/10D01D5/098D01D13/00
Inventor 石峰殷石
Owner 宁波时科新材料科技有限公司
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