Polyvinylidene fluoride porous membrane material reinforced and toughened low-melting-point thermofuse and preparation method thereof

A polyvinylidene fluoride, strengthening and toughening technology, which is applied in the field of low-melting thermal fuse reinforced and toughened polyvinylidene fluoride porous membrane materials and its preparation, can solve the problem of poor bonding fastness, peeling off of surface functional layers, no chemical and Micro-mechanical effects and other issues to achieve excellent water flux, high porosity, and good toughness

Active Publication Date: 2020-04-10
苏州纤创智造新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this kind of braided tube or fiber-reinforced polyvinylidene fluoride membrane, although high tensile strength is obtained, since the polyvinylidene fluoride solution is only coated on the fiber surface of the braided tube, there is no chemical reaction between the fiber and polyvinylidene fluoride. And micro-mechanical action, combined with poor fastness, the surface functional layer is easy to fall off during long-term use, or under harsh cleaning conditions (such as mechanical shaking cleaning or high-pressure backwashing)

Method used

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Examples

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Effect test

preparation example Construction

[0030] In the above-mentioned method for preparing polyvinylidene fluoride hollow fiber porous membrane, the hollow fiber membrane is reinforced by a composite braided tube, and the reinforced composite braided tube mainly contains low-melting thermal fuses, and is also compounded with other fiber filaments . The content of the low melting point thermal fuse is 5wt%-98wt%, and the melting temperature of the low melting point thermal fuse is less than 140°C; the low melting point thermal fuse includes modified polyethylene, polyurethane, random copolymerized modified polyester , one or more of polyamides. Preferably, the modified polyethylene includes ethylene-vinyl acetate copolymer or polyolefin elastomer, and the polyurethane includes polyether polyurethane.

[0031] The monofilament fineness of the low melting point thermal fuse is between 1.0-600dtex (decentex), and the total fineness is between 20-600dtex. The low melting point thermal fuse materials include modified pol...

Embodiment 1

[0036] The low-melting thermal fuse with a denier of 100dtex and other fiber filaments with a denier of 100dtex are mixed with a mass ratio of 2:3 to form a composite braided tube. The inner diameter of the composite braided tube is 1.6mm and the wall thickness is 3.0mm. According to the mass fraction, 12% of polyvinylidene fluoride resin, 78% of acetamide, 8% of silicon dioxide, and 4% of diethylene glycol butyl ether were stirred, and dissolved at 60°C for 6 hours to stand still. Prepare a homogeneous casting solution after soaking.

[0037] Pass the mixing braided tube through the spinneret, and at the same time, the casting solution is extruded through the metering pump. While the braided tube is pulled at a constant speed, the casting liquid is evenly coated on the surface of the composite braided tube, and after passing through a 5cm air section, enters the tap water gel bath to solidify to obtain a reinforced polyvinylidene fluoride hollow fiber membrane.

[0038] Then...

Embodiment 2

[0044] The low-melting thermal fuse with a denier of 50dtex and other fiber filaments with a denier of 50dtex are mixed and woven into a composite braided tube with a mass ratio of 1:2. The inner diameter of the composite braided tube is 1.6mm and the wall thickness is 3.0mm. According to the mass fraction, stir 12% polyvinylidene fluoride resin, 76% dimethylformamide, 8% polyethylene glycol with a molecular weight of 20,000, and 4% diethylene glycol butyl ether at 60 ° C. Dissolved for 6 hours under the same conditions and static defoaming to prepare a homogeneous casting solution.

[0045] Pass the mixing braided tube through the spinneret, and at the same time, the casting solution is extruded through the metering pump. While the mixed braided tube is pulled at a constant speed, the casting solution is evenly coated on the surface of the composite braided tube, and after passing through an 8cm air section, it enters a tap water gel bath for solidification to obtain a reinfo...

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Abstract

The invention discloses a polyvinylidene fluoride porous membrane material reinforced and toughened by a low-melting-point thermofuse and a preparation method thereof. The toughening anti-falling mechanism of the invention is based on the melt flow interface spreading principle of the low-melting-point thermofuse in a braided tube; a polyvinylidene fluoride solution coats the surface of the composite braided tube, and then curing and forming are conducted; and simple heat treatment is carried on the hollow fiber membrane, so the low-melting-point thermofuse can be melted and flows and spreadsin micropores in the membrane and forms a continuous interspersed rivet structure with the polyvinylidene fluoride material . With such a structure form, a polyvinylidene fluoride functional layer canbe effectively prevented from falling off, and can be effectively reinforced and toughened, so the membrane is more hydrophilic and is improved in flux and anti-pollution capability. The porous membrane prepared by the preparation method in the invention has the advantages of high strength, good toughness and the like, and can be used in the aspects of filtration separation, tap water purification, sewage treatment and reuse and the like.

Description

technical field [0001] The invention relates to the technical field of porous membrane preparation, in particular to a low melting point thermal fuse reinforced and toughened polyvinylidene fluoride porous membrane material and a preparation method. Background technique [0002] PVDF hollow fiber membrane has good pollution resistance, acid and alkali resistance, water flux and filtration performance, and is widely used in water treatment and industrial separation fields, so many membrane technologies have emerged. [0003] In the prior art, there is provided a method for obtaining polyvinylidene fluoride hollow fiber membranes by dry-wet spinning, which can be used to obtain a high-throughput, large-pore size membrane suitable for medical and health industries and food industries. Polyvinylidene fluoride hollow fiber membrane. In this method, due to the limitation of the modified membrane method, the membrane strength will be affected to a certain extent, and its applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J5/04C08L27/16C08L71/02
CPCC08J5/18C08J5/047C08J2327/16C08J2471/02
Inventor 李先锋韩春梅王宁
Owner 苏州纤创智造新材料科技有限公司
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