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Modification method for polypropylene fibers

A polypropylene fiber and modification technology, applied in the direction of fiber type, fiber treatment, textile and paper making, etc., can solve the problems of low surface energy of polypropylene, poor physical and chemical adhesion, lack of active functional groups in molecular chain, etc. The effect of increasing the degree and enhancing the adhesion

Active Publication Date: 2018-06-08
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not mentioned that the surface energy of polypropylene is low, the molecular chain lacks active functional groups, and the surface is hydrophobic, so that the fibers are not easy to disperse in cement-based materials, and the physical and chemical adhesion with the substrate is poor. Application of Propylene Fiber in Cement-Based Materials

Method used

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  • Modification method for polypropylene fibers
  • Modification method for polypropylene fibers
  • Modification method for polypropylene fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A modification method of polypropylene fiber, comprising the following steps:

[0072] (1) After the polypropylene fiber is degreased, it is dried to constant weight and set aside;

[0073] (2) Preparation of chromic acid solution:

[0074] Proportion by mass, K 2 Cr 2 o 7 :H 2 O: Concentrated H 2 SO 4 =5:8:75, mix the three and react for 5 minutes to obtain chromic acid;

[0075] (3) Weigh the polypropylene fiber with constant weight, put it into the chromic acid solution, soak it at room temperature for 0.5h, and then react, the reaction temperature is 65-70°C, and the reaction time is 4min;

[0076] (4) The reacted polypropylene fibers are washed with distilled water, filtered, and dried in an oven at 80° C. for 8 hours, and then dried in a desiccator to constant weight to obtain modified polypropylene fibers;

[0077] (5) Calculate the weight loss rate and moisture absorption rate of the modified polypropylene fiber, the weight loss rate is 6.34%, and the mo...

Embodiment 2

[0079] A modification method of polypropylene fiber, comprising the following steps:

[0080] (1) After the polypropylene fiber is degreased, it is dried to constant weight and set aside;

[0081] (2) Preparation of chromic acid solution:

[0082] Proportion by mass, K 2 Cr 2 o 7 :H 2 O: Concentrated H 2 SO 4 =5:8:100, mix the three and react for 8 minutes to obtain chromic acid;

[0083] (3) Weigh the constant-weight polypropylene fiber, put it into the chromic acid solution, soak it at room temperature for 2.5 hours, and then react, the reaction temperature is 65-70°C, and the reaction time is 4 minutes;

[0084] (4) The reacted polypropylene fibers are washed with distilled water, filtered, and dried in an oven at 80° C. for 8 hours, and then dried in a desiccator to constant weight to obtain modified polypropylene fibers;

[0085] (5) Calculate the weight loss rate and moisture absorption rate of the modified polypropylene fiber, the weight loss rate is 6.82%, and ...

Embodiment 3

[0087] A modification method of polypropylene fiber, comprising the following steps:

[0088] (1) After the polypropylene fiber is degreased, it is dried to constant weight and set aside;

[0089] (2) Preparation of chromic acid solution:

[0090] Proportion by mass, K 2 Cr 2 o 7 :H 2 O: Concentrated H 2 SO 4 =5:8:125, mix the three and react for 10 minutes to obtain chromic acid;

[0091] (3) Weigh the polypropylene fiber with constant weight, put it into the chromic acid solution, soak it at room temperature for 2.5h, and then react, the reaction temperature is 65-70°C, and the reaction time is 8min;

[0092] (4) The reacted polypropylene fibers are washed with distilled water, filtered, and dried in an oven at 80° C. for 8 hours, and then dried in a desiccator to constant weight to obtain modified polypropylene fibers;

[0093] (5) Calculate the weight loss rate and moisture absorption rate of the modified polypropylene fiber, the weight loss rate is 13.90%, and the...

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Abstract

The invention discloses a modification method for polypropylene fibers and belongs to the technical field of chemical fiber materials. The modification method comprises the following steps: firstly, drying the polypropylene fibers to constant weight for later use; secondly, preparing a chromic acid solution, taking K2Cr2O7, H2O and H2SO4 for mixing and reacting to obtain chromic acid; thirdly, weighing the constant-weight polypropylene fibers, putting into the chromic acid solution, soaking at room temperature for 0.5 to 2.5 hours and then reacting; fourthly, washing the reacted polypropylenefibers, filtering and carrying out drying treatment to constant weight, thus obtaining modified polypropylene fibers; fifthly, measuring and calculating the weight loss ratio and moisture rate of themodified polypropylene fibers as well as the change of the contents of surface functional groups of the polypropylene fibers before and after modification. According to the modification method disclosed by the invention, the surfaces of the polypropylene fibers are oxidized and active groups are introduced while the adhesion between the polypropylene fibers and a base material is enhanced, so thatthe surfaces of the polypropylene fibers have certain hydrophilic ability and sufficient distribution of the modified polypropylene fibers in cement-based materials is more easily realized.

Description

Technical field: [0001] The invention belongs to the technical field of chemical fiber materials, and in particular relates to a method for modifying polypropylene fibers. Background technique: [0002] The role of fiber in concrete is mainly to prevent cracks caused by the plastic shrinkage of cement during curing. In the prior art, the added fibers mainly include metal steel fibers, inorganic asbestos fibers, glass fibers and various synthetic fibers. [0003] British patent (1130612) proposes to replace traditional reinforcing fibers with membrane-split polypropylene fibers to improve the crack resistance, anti-seepage, impact resistance, and bending resistance of concrete. It is not easy to disperse in cement mixing, and it is easy to cause local agglomeration, which will affect the improvement of the mechanical properties of fiber reinforced concrete. [0004] Chinese patent (CN 1888161A) provides a polypropylene fiber with a porous cross-sectional shape added to concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/48C04B20/02C04B16/06D06M101/20
CPCC04B16/0633C04B20/023D06M11/48D06M2101/20
Inventor 张向东冯俊杰
Owner LIAONING TECHNICAL UNIVERSITY
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