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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  • 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 m

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

Experimental program
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Example Embodiment

[0021] A method for preparing modified polypropylene composite fiber, which includes:

[0022] The 1-2wt% polypropylene fiber aqueous solution, the diisocyanate and the oxidizing agent are reacted at 50-60°C for 50-70 minutes, and heated to 90-100°C to react with the initiator for 1-2 hours to obtain the 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] The diisocyanate and oxidizing agent oxidize polypropylene fiber, increase the activity of polypropylene fiber, and make the carbon-oxygen double bond activity of polypropylene fiber higher. Modified polypropylene fiber with high active carbon-oxygen double bond is easier to interact 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...

Example Embodiment

[0044] Example 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, where: the mass of potassium permanganate is 1.5% of the mass of polypropylene fiber; the mass of diisocyanate is 30% of polypropylene fiber. Protected by nitrogen, heated to 50°C in a DF-1 heat-collecting magnetic heating stirrer. After swelling for 60 minutes, the temperature is rapidly raised to 90°C, then the initiator BPO is added, reacted for 120 minutes, cooled, filtered, and washed with acetone and water. After neutralization, it is dried in vacuum at 60°C to constant weight to obtain modified polypropylene fiber.

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

Example Embodiment

[0048] Example 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, where: the mass of potassium permanganate is 1.5% of the mass of polypropylene fiber; the mass of diisocyanate It is 50% of polypropylene fiber. Protected by nitrogen, heated to 60°C in a DF-1 heat-collecting magnetic heating stirrer, after swelling for 60 minutes, quickly heated to 100°C, then added initiator BPO, and reacted for 120 minutes. After cooling, suction filtration, washing with acetone and water to neutrality, vacuum drying at 60°C to constant weight, the modified polypropylene fiber is obtained.

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

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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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