Compatible ethylene-tetrafluoroethylene copolymer nano-composite material and preparation method thereof

A nano-composite material and tetrafluoroethylene technology are applied in the field of compatible ethylene-tetrafluoroethylene copolymer nano-composite materials and their preparation, and can solve the problems of poor compatibility and agglomeration between nanoparticles and ETFE matrix.

Inactive Publication Date: 2020-06-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polymer-based nanocomposite system has many properties, but there are few studies on the nanocomposite system of ETFE materials at present, mainly due to the particularity of ETFE materials, the compatibility between nanoparticles and ETFE matrix is ​​poor, and they are easy to agglomerate in the system

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  • Compatible ethylene-tetrafluoroethylene copolymer nano-composite material and preparation method thereof
  • Compatible ethylene-tetrafluoroethylene copolymer nano-composite material and preparation method thereof
  • Compatible ethylene-tetrafluoroethylene copolymer nano-composite material and preparation method thereof

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[0034] The invention provides a preparation method of a compatible ethylene-tetrafluoroethylene copolymer nanocomposite material, comprising the following steps:

[0035] Pretreating the montmorillonite nanoparticles with an organic quaternary phosphonium salt to obtain OMMT;

[0036] Using a silane coupling agent to activate and modify the surface of the OMMT to obtain an activated OMMT;

[0037] Grafting a fluorine-containing monomer onto the activated OMMT to obtain a fluorinated modified OMMT;

[0038] Mixing the fluorinated modified OMMT with ethylene-tetrafluoroethylene copolymer and polyvinylidene fluoride, extruding and granulating, and molding to obtain a compatible ethylene-tetrafluoroethylene copolymer nanocomposite material;

[0039] The mass ratio of the fluorinated modified OMMT to the ethylene-tetrafluoroethylene copolymer and polyvinylidene fluoride is 0.1-4:88-92:8-12.

[0040] In the invention, the montmorillonite nanoparticles are pretreated with an organi...

Embodiment 1

[0053] A montmorillonite-based fluorinated nanoparticle with a structure of PDFMA-g-OMMT, the synthesis route is as follows figure 1 shown;

[0054] (1) Preparation of OMMT: Add 20g of montmorillonite (MMT), 200ml of deionized water, and 20g of tetraphenylphosphonium bromide (TPB) into a 500ml flask under air atmosphere, and heat to 80°C for 8h. After the reaction, cool to room temperature, remove unreacted TPB with water / ethanol (1:1) mixture, centrifuge at 8000rpm for 5min, remove the supernatant, and vacuum dry the residue at 80°C for 10h to obtain OMMT nanoparticles.

[0055] (2) Preparation of OMMT-2: Add 2 g of OMMT and 75 ml of water / ethanol (1:9) mixture into a 250 ml flask under air atmosphere, and stir at high speed (500 rpm) for 30 min. Add 30ml of γ-methacryloxypropyl trimethylsiloxane (KH-570), stir at high speed (500rpm) for 2 hours, and disperse ultrasonically for 1 hour. After the reaction is complete, wash off the unreacted KH-570 with ethanol. Centrifuge at...

Embodiment 2

[0060] Weigh the PDFMA-g-OMMT nanoparticles prepared in 0.1g embodiment 1, 90g ETFE and 10g PVDF, pre-blended by means of mechanical stirring, and then extrude using a twin-screw extruder. The extrusion temperature in each region is as follows: 1 Zone 250°C, Zone 2 265°C, Zone 3 280°C, Zone 4 285°C, Zone 5 280°C, Zone 6 275°C, Die 280°C, extrusion rate 80rpm. Finally, it is molded under a flat vulcanizer. The hot pressing temperature is 280°C, the hot pressing pressure is 8MPa, and the time is 5 minutes. The cold pressing temperature is 25°C, and the cold pressing pressure is 10MPa, and the time is 20 minutes. - Tetrafluoroethylene copolymer nanocomposites. The phase interface was measured as Figure 4 as shown, Figure 4 It is a cross-sectional morphology diagram of the compatible ethylene-tetrafluoroethylene copolymer nanocomposite prepared in Example 2 of the present invention. At this time, the sample had a yield strength of 16.5 MPa and an elongation at break of 463% a...

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Abstract

The invention provides a compatible ethylene-tetrafluoroethylene copolymer nano-composite material and a preparation method thereof. The method comprises the following steps: pretreating montmorillonite nanoparticles (MMT) with an organic quaternary phosphonium salt to obtain OMMT; carrying out activation modification on the surface of the OMMT by adopting a silane coupling agent to obtain activated OMMT; grafting a fluorine-containing monomer onto the activated OMMT so as to obtain fluorinated modified OMMT; mixing the fluorinated modified OMMT with an ethylene-tetrafluoroethylene copolymer and polyvinylidene fluoride, and carrying out extrusion granulation and compression molding to obtain the compatible ethylene-tetrafluoroethylene copolymer nano-composite material, wherein the mass ratio of the fluorinated modified OMMT to the ethylene-tetrafluoroethylene copolymer to the polyvinylidene fluoride is (0.1-4):(88-92):(8-12). The nano-composite material has good mechanical properties;and the composite system has a stable homogeneous structure.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a compatible ethylene-tetrafluoroethylene copolymer nanocomposite material and a preparation method thereof. Background technique [0002] Ethylene-tetrafluoroethylene (ETFE) is composed of ethylene monomer (CH 2 =CH 2 ) and tetrafluoroethylene monomer (CF 2 = CF 2 ) copolymerized, has many excellent properties. However, in the actual production process, this two-component copolymer has the disadvantages of low processing viscosity and narrow processing temperature range, which makes ETFE difficult to process and produce. In addition, the ETFE composite material is an incompatible system. During the stretching process of the ETFE composite material, when the tensile strength is greater than 15MPa, the material will yield. The reason for this phenomenon is that ETFE is a semi-crystalline polymer. During the stretching process, the crystal structure in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L27/16C08L51/10C08L23/08C08F292/00C08F220/24
CPCC08F292/00C08L23/0892C08L27/18C08L2205/02C08L27/16C08L51/10C08F220/24
Inventor 冉祥海钱景聂伟付超高一星崔洪伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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