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Concrete Anti-crack Modified polypropylene fibre for preventing concrete from crack and its manufacture

A polypropylene fiber, cement concrete technology, applied in the direction of single-component polypropylene artificial filament, fiber treatment, conjugated synthetic polymer artificial filament, etc., can solve the problem of low fiber performance/cost ratio, high cost, and poor effect And other problems, to achieve excellent anti-crack performance, improve the affinity, the effect of good fiber performance

Inactive Publication Date: 2003-04-02
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The early process used the method of impregnating the fiber in polyethylene glycol, pressing, drying (JP630022973) or treating it with colloidal silicon or aluminum after chlorination (JP680093512), but the effect was poor and the cost was high
[0008] Late period JP770144488, JP6219797, JP6248506, EP0535373, JP705212 etc. adopt carbonic acid, silicate, silicon, aluminum, zinc oxide of inorganic matter calcium and magnesium in fiber matrix or cortex structure, and use alkali metal salt of alkyl phosphate to Fiber surface treatment method, but when calcium carbonate and other inorganic substances are blended with polypropylene resin for melt spinning, the inorganic particles are easy to agglomerate, thereby blocking the filter screen or spinneret hole, making the replacement of the filter screen and spinneret assembly The cycle is greatly shortened, and it is difficult to achieve continuous and stable industrialization
[0009] JP7243120 adopts the method of adding ethylene-vinyl acetate copolymer saponification in the fiber matrix or cortex structure, but the performance / cost ratio of the fiber obtained by this method is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add bisphenol A polycarbonate resin slices with a molecular weight of 35,000 to the polypropylene resin slices with MFI=12 at a ratio of 2.5% through a masterbatch metering and mixing device, and extrude through a single-screw melt extruder , the extrusion melt temperature is controlled at 280°C.

[0031]Then it is transported through the melt distribution pipeline, metered by the spinning metering pump and extruded by the spinneret assembly, then cooled and solidified, and the surface treatment agent triethanolammonium dodecyl phosphate is adsorbed by the oil pan oiling device, and the concentration of the aqueous solution of the treatment agent is 7%. , and then after two-stage hot box drawing (the total drawing ratio is 8.9 times), heat setting, and cutting, short fibers with a denier of 25d and a length of 15mm are obtained. The strength of the fiber is 6.1g / d and the modulus is 46.3g / d , The elongation at break is 15.2%, and the amount of the surface treatment agen...

Embodiment 2

[0035] Others are the same as in Example 1, except that the surface treatment agent adopts a compound salt (m=3, n=1) of n-alkyl phosphate ester, triethanolammonium and monoethanolamine, and the spinning additive adopts polyphthalate carbonate Ester, the addition amount is 0.1%, the MFI of polypropylene resin is 30, and the spinning temperature is 240°C. By reducing the spinneret hole and shortening the cutting length, a short fiber with a single filament fineness of 12.5d and a length of 10mm can be obtained. The strength of the fiber is It is 7.0g / d, the modulus is 51g / d, the elongation at break is 14.3%, and the amount of surface treatment agent is 5%.

[0036] The fiber can be used in cement and concrete construction occasions that have finer requirements on the fineness of single filaments. Compared with ordinary concrete without adding fibers, the test results show that the crack resistance is increased by 73.4%, the impermeability is increased by 63%, and the impact resi...

Embodiment 3

[0038] Others are the same as Example 1, and the difference is that the surface treatment agent adopts diethanolammonium octyl phosphate, and the spinning additive is poly(dimethylsiloxane) polycarbonate block copolymer, and the addition is 0.5%. The temperature of the filament is 260°C, the melt is extruded through the spinneret assembly with a smaller spinneret hole and then cooled and solidified, stretched through a higher nozzle and shortened the cut length to obtain short fibers with a single filament fineness of 2.7d and a length of 6mm. The strength is 8.2g / d, the modulus is 60g / d, the elongation at break is 17.8%, and the amount of octyldiethanolammonium phosphate is 1.9%.

[0039] The fiber can be used in cement and concrete construction occasions that have finer requirements for single filament fineness. Compared with ordinary concrete without adding fibers, the test results show that the crack resistance is increased by 75%, the impermeability is increased by 66%, t...

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Abstract

A modified polypropylene fibre for preventing the cracking of cement concrete is prepared through adding the modified high polymer resin to polypropylene resin, fusing, spinning and surface treating with ethanolamine alkylphosphate. Its advantages are high effect and performance, and low cost.

Description

technical field [0001] The present invention relates to a modified polypropylene fiber, in particular, the present invention relates to a modified polypropylene fiber for improving concrete cracking defects, and a manufacturing method of the fiber. Background technique [0002] As we all know, concrete and its products have become the main materials used in construction, civil engineering and water conservancy projects. Although concrete has many advantages such as high compressive strength, fire resistance, water resistance, durability, and easy mold, it has the defect of being easy to crack. Causes include uneven stress distribution when cement cures, cracks leading to CO in rainwater 2 and SO 2 Intrusion, etc., cracks will lead to the corrosion of concrete and its steel bars, resulting in a decrease in tensile strength, a decrease in the ratio of tensile and compressive strength, small ultimate deformation, and brittleness. [0003] Use dispersed fibers to strengthen ce...

Claims

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Application Information

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IPC IPC(8): C04B16/06C04B20/10C04B24/00
CPCC04B16/0633C04B20/1022C04B24/003C04B2111/343
Inventor 孙玉山史小兴王玥骆强张彩霞陆伊伦李启明
Owner CHINESE TEXTILE ACAD
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