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High pullout strength building reinforced polyacrylonitrile short-cut fiber, preparation method and applications thereof

A technology of chopped fiber and polyacrylonitrile is applied in the field of building reinforced polyacrylonitrile chopped fiber and its preparation, which can solve the problems of poor compression resistance and the like, and achieve the effect of improving compression resistance.

Active Publication Date: 2018-12-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems mainly solved by the present invention is the problem of poor compressive resistance of polyacrylonitrile chopped fiber building reinforcement materials existing in the prior art

Method used

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  • High pullout strength building reinforced polyacrylonitrile short-cut fiber, preparation method and applications thereof
  • High pullout strength building reinforced polyacrylonitrile short-cut fiber, preparation method and applications thereof
  • High pullout strength building reinforced polyacrylonitrile short-cut fiber, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Stock solution preparation: Refined acrylonitrile, sodium methacryl sulfonate, methyl acrylate in mass ratio 99.6:0.2:0.2, solid content 15%, azobisisobutyronitrile accounted for 0.2wt% of comonomer, with Add dimethyl sulfoxide as a solvent into the reactor, and react at a constant temperature of 50° C. for 20 hours under the protection of nitrogen to obtain a polymerization stock solution with an intrinsic viscosity of 3.2 dL / g. After "vacuum-nitrogen" replacement, single removal, vacuum defoaming, and 2 micron precision filtration, the spinning stock solution is prepared.

[0045] 2. Coagulation forming: The primary fiber is prepared by wet spinning. The spinning stock solution is accurately metered by a metering pump and filtered again, and then enters the first coagulation bath through the spinneret. The coagulation temperature is 25°C and the concentration is 50%. The draw ratio is -20%, followed by two-stage coagulation and drawing, and the draw ratios are resp...

Embodiment 2

[0053] 1. Stock solution preparation: same as Step 1 of Example 1.

[0054] 2. Solidification molding: same as step 2 of embodiment 1.

[0055] 3. Drawing and washing: same as Step 3 of Example 1.

[0056] 4. One-time oiling and drying and densification: same as Step 4 of Example 1.

[0057] 5. Steam drawing and heat setting: same as Step 5 of Example 1.

[0058] 6. Secondary oiling and re-drying of oil agent: same as Step 6 of Example 1.

[0059] 7. Fiber steam chopping: the fibers obtained in step 6 are placed in a steam chopping machine, and the fibers are crimped and cut under a steam pressure of 0.7 MPa combined with mechanical action; the crimp density at both ends of the obtained fibers is 0.6 pieces / mm, The equal length of the crimps at both ends is 2 mm, the crimps at both ends are S-shaped, the length of the chopped fibers is 6 mm, and the linear density of the fibers is 1.5 dtex.

[0060] The tensile strength of the obtained chopped fibers in cement mortar was t...

Embodiment 3

[0062] 1. Stock solution preparation: same as Step 1 of Example 1.

[0063] 2. Solidification molding: same as step 2 of embodiment 1.

[0064] 3. Drawing and washing: same as Step 3 of Example 1.

[0065] 4. One-time oiling and drying and densification: same as Step 4 of Example 1.

[0066] 5. Steam drawing and heat setting: same as Step 5 of Example 1.

[0067] 6. Secondary oiling and re-drying of oil agent: same as Step 6 of Example 1.

[0068] 7. Fiber steam chopping: the fibers obtained in step 6 are placed in a steam chopping machine, and the fibers are crimped and cut under a steam pressure of 0.7 MPa combined with mechanical action; the crimp density at both ends of the obtained fibers is 0.6 pieces / mm, The curled length at both ends is equal to 2 mm, the curled shape at both ends is hook-shaped, the length of the chopped fiber is 6 mm, and the linear density of the fiber is 1.5 dtex.

[0069] The tensile strength of the obtained chopped fibers in cement mortar was...

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Abstract

The invention relates to a high pullout strength building reinforced polyacrylonitrile short-cut fiber, a preparation method and applications thereof. A purpose of the present invention is to mainly solve the problem of poor compressive performance of the fiber in the building reinforced material in the prior art. According to the present invention, the building reinforced polyacrylonitrile short-cut fiber is prepared from polyacrylonitrile-based precursor, wherein the middle of the fiber is a straight section, both ends are coiling sections, the coiling density of the coiling section is 0.1-2 / mm, and the total length of the coiling section is 1-10 mm. With the technical scheme, the problem in the prior art is well solved. The high pullout strength building reinforced polyacrylonitrile short-cut fiber of the present invention has good compressive performance, and can be used in the industrial application of building reinforced materials.

Description

technical field [0001] The invention relates to a building reinforced polyacrylonitrile chopped fiber and its preparation method and application. More specifically, the invention relates to a building cement reinforced polyacrylonitrile fiber and its preparation method and application. Background technique [0002] Cement material is a base material widely used in building materials. It has a series of advantages such as good machinability, simple construction technology, and low price. It can be used to make building materials such as cement mortar and cement concrete. During the use of cement mortar, cement concrete and other materials, with the volatilization of moisture in the material and the solidification of the material, a large number of pores will be formed in the material. These tiny pores are easy to become the material fracture when the material is stressed. Defects, a large number of pores make the cement material have disadvantages such as easy cracking and hi...

Claims

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Application Information

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IPC IPC(8): D01F6/38D01G1/04D02G1/00
CPCD01F6/38D01G1/04D02G1/004
Inventor 李磊沈志刚缪金根赵微微
Owner CHINA PETROLEUM & CHEM CORP
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