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Modified polypropylene composite fibers and preparation method thereof

A polypropylene fiber and composite fiber technology, applied in the field of materials, can solve problems such as weak adhesion, and achieve the effects of improving adhesion, increasing activity, and regulating flexural resistance.

Active Publication Date: 2018-01-09
中建西部建设新疆有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a modified polypropylene composite fiber and its preparation method, which aims to improve the existing problem of weak bonding ability between polypropylene fiber and other materials

Method used

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  • Modified polypropylene composite fibers and preparation method thereof
  • Modified polypropylene composite fibers and preparation method thereof
  • Modified polypropylene composite fibers and preparation method thereof

Examples

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preparation example Construction

[0021] A preparation method of modified polypropylene composite fiber, comprising:

[0022] React 1-2wt% polypropylene fiber aqueous solution, diisocyanate and oxidizing agent at 50-60°C for 50-70 minutes, raise the temperature to 90-100°C and react with initiator for 1-2 hours to obtain modified polypropylene fiber.

[0023] The mixed solution of the graphene oxide aqueous solution and the modified polypropylene fiber is reacted at 50-60°C for 1-2 hours, and then washed and dried.

[0024] Diisocyanates and oxidants oxidize polypropylene fibers, increase the activity of polypropylene fibers, and make the carbon-oxygen double bonds of polypropylene fibers more active. Modified polypropylene fibers with highly active carbon-oxygen double bonds are more likely to combine with graphene oxide. graft.

[0025] Graphene oxide is a derivative of graphene, which has a two-dimensional structure similar to graphene. Graphene oxide has super high strength, super large specific surface ...

Embodiment 1

[0045] This embodiment provides a modified polypropylene composite fiber, which is mainly prepared through the following steps:

[0046] Add 1wt% polypropylene fiber aqueous solution, 0.004mol / L potassium permanganate aqueous solution, and diisocyanate into a three-necked flask, wherein: the quality of potassium permanganate is 1.5% of the polypropylene fiber quality; the quality of diisocyanate is 30% of polypropylene fibers. Protected by nitrogen gas, heated to 50°C in DF-1 collector type magnetic heating stirrer, after swelling for 60 minutes, quickly raised the temperature to 90°C, then added the initiator BPO, reacted for 120 minutes, cooled, filtered with suction, washed with acetone and water until After neutralization, vacuum-dry at 60°C to constant weight to obtain modified polypropylene fibers.

[0047]Get modified polypropylene fiber and 1wt% graphene oxide dispersion (the mass ratio of modified polypropylene fiber and graphene oxide dispersion is 50:1), add water ...

Embodiment 2

[0049] This embodiment provides a modified polypropylene composite fiber, which is mainly prepared through the following steps:

[0050] Add 1wt% polypropylene fiber aqueous solution, diisocyanate, and 0.002mol / L potassium permanganate aqueous solution into a three-necked flask, wherein: the quality of potassium permanganate is 1.5% of the polypropylene fiber quality; the quality of diisocyanate 50% of polypropylene fiber. Under nitrogen protection, heat to 60°C in a DF-1 collector type magnetic heating stirrer, after swelling for 60 minutes, rapidly raise the temperature to 100°C, then add the initiator BPO, and react for 120 minutes. Cool, filter with suction, wash with acetone and water until neutral, and dry in vacuum at 60°C to constant weight to obtain modified polypropylene fibers.

[0051] Get modified polypropylene fiber and 3wt% graphene oxide dispersion (the mass ratio of modified polypropylene fiber and graphene oxide dispersion is 50:3), add water to 500ml, ultra...

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Abstract

The invention relates to the field of materials, in particular to modified polypropylene composite fibers and a preparation method thereof. The preparation method comprises the following steps: carrying out reaction on 1-2wt% of polypropylene fiber aqueous solution, diisocyanate and an oxidizing agent for 50-70 minutes at the temperature of 50-60 DEG C, heating to 90-100 DEG C, and reacting with an initiator for 1-2 hours, so that the modified polypropylene fibers are obtained. A mixed solution of of a graphene oxide aqueous solution and modified polypropylene fibers react for 1-2 hours at thetemperature of 50-60 DEG C, and then washing and drying are carried out. Diisocyanate and the oxidizing agent oxidize the polypropylene fibers, activity of the polypropylene fibers is enhanced, the modified polypropylene fibers are grafted with graphene oxide, and high-activity carbon-oxygen double bonds are connected with hydroxyls and carboxyls on the surface of graphene oxide. When the modified polypropylene composite fibers are doped into a cement-based material, toughness of concrete is improved from macroscopical and microcosmic double levels, and adhesion between the cement and the fibers is also beneficially improved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a modified polypropylene composite fiber and a preparation method thereof. Background technique [0002] Polypropylene fiber is a common organic fiber. When polypropylene fiber is mixed into cement-based materials, due to its good toughness, it can improve the tensile, flexural and shear properties of cement-based materials to a certain extent. But because the bonding ability of polypropylene fiber and cement-based materials becomes poor. [0003] Accordingly, the inventors have invented a method for modifying polypropylene fibers. Contents of the invention [0004] The purpose of the present invention is to provide a modified polypropylene composite fiber and its preparation method, which aims to improve the existing problem of weak bonding ability between polypropylene fiber and other materials. [0005] The invention provides a technical solution: [0006] A preparation method of...

Claims

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Application Information

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IPC IPC(8): D06M11/74D06M13/395C04B20/02C04B16/06D06M101/20
Inventor 陈旭王玉娟刘帅岳彩虹李凯康明沈洁
Owner 中建西部建设新疆有限公司
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