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Polyvinyl alcohol fiber reinforced polyurethane grouting reinforcement material and preparation method thereof

A polyvinyl alcohol fiber, grouting reinforcement technology is applied in the field of polyurethane grouting reinforcement materials reinforced with high-strength and high-modulus polyvinyl alcohol ultra-short fibers, which can solve the problem of unsuitable industrial mass production and poor fluidity of the slurry. Good performance, small penetration radius, etc., to achieve the effect of enhancing the performance of reinforcement, easy grouting operation, and strong permeability

Inactive Publication Date: 2015-08-12
HUAINAN MINING IND GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these modification methods can improve the mechanical strength of polyurethane, there are still many disadvantages, such as: calcium carbonate and mica modified slurry fluidity is not good, resulting in difficulty in grouting, small penetration radius; high production cost, not suitable for industrial mass production etc.

Method used

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  • Polyvinyl alcohol fiber reinforced polyurethane grouting reinforcement material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Select polyvinyl alcohol fibers with a length of 4.0 mm and a diameter of 14.0 μm, breaking strength ≥ 10 cN / dtex, and initial modulus ≥ 220 cN / dtex, and modify the polyvinyl alcohol fibers according to the following steps.

[0055] Step a), take the polyvinyl alcohol fiber and place it in a watch glass, put it in a drying oven, bake it at 120°C for 30 minutes, remove the wetting agent on the surface of the fiber, and then cool it down to room temperature naturally;

[0056] Step b), mix absolute ethanol and silane coupling agent KH550 according to the volume ratio of 200:1 to obtain a mixed solution, add the polyvinyl alcohol fibers treated in step a) into the mixed solution, and ultrasonically treat at 40°C After 30min, the fibers were filtered out from the solution after standing;

[0057] In step c), the polyvinyl alcohol fibers treated in step b) are dried at 80° C. for 180 minutes to obtain modified polyvinyl alcohol fibers, which are cooled for later use.

Embodiment 2

[0059] Select polyvinyl alcohol fibers with a length of 5.6 mm and a diameter of 14.0 μm, breaking strength ≥ 10 cN / dtex, and initial modulus ≥ 220 cN / dtex, and modify the polyvinyl alcohol fibers according to the following steps.

[0060] Step a), take the polyvinyl alcohol fiber and place it in a watch glass, put it in a drying oven, bake it at 130°C for 20 minutes, remove the wetting agent on the surface of the fiber, and cool it down to room temperature naturally;

[0061] Step b), mix absolute ethanol and silane coupling agent KH550 uniformly according to the volume ratio of 180:1 to obtain a mixed solution, add the polyvinyl alcohol fibers treated in step a) into the mixed solution, and ultrasonically treat at 30°C After 90min, the fiber was filtered out from the solution after standing still;

[0062] In step c), the polyvinyl alcohol fibers treated in step b) are dried at 90° C. for 130 minutes to obtain modified polyvinyl alcohol fibers, which are cooled for later use...

Embodiment 3

[0064] Select polyvinyl alcohol fibers with a length of 7.0 mm and a diameter of 14.0 μm, breaking strength ≥ 10 cN / dtex, and initial modulus ≥ 220 cN / dtex, and modify the polyvinyl alcohol fibers according to the following steps.

[0065] Step a), put the polyvinyl alcohol fiber in a watch glass, put it in a drying oven, bake it at 140°C for 10 minutes, remove the wetting agent on the surface of the fiber, and cool it down to room temperature naturally;

[0066] Step b), mix absolute ethanol and silane coupling agent KH550 according to the volume ratio of 165:1 to obtain a mixed solution, add the polyvinyl alcohol fibers treated in step a) into the mixed solution, and ultrasonically treat at 50°C After 120min, the fiber was filtered out from the solution after standing still;

[0067] In step c), the polyvinyl alcohol fibers treated in step b) are dried at 100° C. for 80 minutes to obtain modified polyvinyl alcohol fibers, which are cooled for later use.

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Abstract

The invention relates to a polyvinyl alcohol fiber enhanced polyurethane grouting reinforcement material and a preparation method thereof, wherein a component A and a component are mixed together for grouting reinforcement; the compound A is mixed by the following components by weight percent of 40%-65% of isocyanate prepolymer, 10%-35% of fire retardant and 2%-5% of antistatic agent; the component B is formed by mixing the following components by weight percent of 20%-40% of polyether polyol, 0.1%-1% of catalyst and 0.5%-5% of polyvinyl alcohol fibers; the polyvinyl alcohol fibers are 4.0mm to 10.0mm long and have the diameter of 14.0 microns; the breaking strength of the polyvinyl alcohol fibers is greater than or equal to 10cN / dtex; the initial modulus of the polyvinyl alcohol fibers is greater than or equal to 220cN / dtex. After being solidified, the polyurethane grouting reinforcement material provided by the invention has high tensile strength, compressive strength and bonding strength, and is good in mechanical properties, low in production cost and applicable to industrial production.

Description

technical field [0001] The invention relates to a mine-used polyurethane grouting reinforcement material, in particular to a polyurethane grouting reinforcement material reinforced and modified by high-strength and high-modulus polyvinyl alcohol ultra-short fibers. Background technique [0002] The support and reinforcement of the roof in the coal mine mining process is an important link to ensure safety. In the process of coal mining, accidents are often caused by reasons such as roof shedding, roof fall, and collapse. Therefore, it is necessary to attach great importance to the reinforcement of the mine bed and roof to reduce the occurrence of accidents and casualties. Among them, using mine grouting material for grouting reinforcement is a very effective improvement method. By injecting mining grouting reinforcement materials into the rock cracks in the coal seam, the rock cracks can be firmly anchored together to prevent relative movement between rock blocks, and finall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/10C08L75/08C08L29/04C08J5/06C08K5/521
CPCC08G18/10C08G18/12C08G18/4804C08J5/06C08J2375/08C08J2429/04C08L75/08C08L2205/16C08G18/48C08L29/04
Inventor 夏茹唐永志朱述文陈鹏汪文静钱家盛程桦荣传新杨斌苗继斌苏丽芬
Owner HUAINAN MINING IND GRP
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