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 rayon, fiber treatment, conjugated synthetic polymer rayon, etc., can solve the problem of high cost, low fiber performance/cost ratio, filter screen, etc. And the problems of shortening the replacement cycle of spinneret components, etc., to achieve the effect of improving affinity, good fiber performance, and excellent anti-cracking performance of cement concrete
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Embodiment 1
[0040] 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.
[0041] 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 age...
Embodiment 2
[0045] 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 is obtained, and 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%.
[0046] 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
[0048] 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%.
[0049] 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
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