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A kind of polyvinylidene fluoride resin and its preparation method and application

A technology of polyvinylidene fluoride resin and vinylidene fluoride, which is applied in the field of polyvinylidene fluoride resin and its preparation, can solve the problems of poor processing performance and insufficient strength, and achieves improved processing performance, improved impact resistance, good phase capacitive effect

Active Publication Date: 2020-06-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the copolymer has good flexibility, but insufficient strength and poor processability

Method used

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  • A kind of polyvinylidene fluoride resin and its preparation method and application
  • A kind of polyvinylidene fluoride resin and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1, preparation polyvinylidene fluoride resin

[0066] Add 2500g of deionized water and ammonium perfluorooctanoate emulsifier into a 5L vertical kettle (300rpm), then raise the temperature of the polymerization kettle and add VDF monomer. After the temperature of the polymerization kettle reaches 75°C and the pressure of the kettle reaches 1.6MPa, pass Add the initiator diisopropyl peroxydicarbonate and the chain transfer agent acetone to the auxiliary pump to start the reaction. During the reaction, the addition methods of the monomer, initiator and chain transfer agent are shown in Table 1. Stable to the completion of the reaction, wherein, the first stage stops the reaction when the consumption of vinylidene fluoride monomer is 50% (300g VDF) of the total monomer total weight of the three stages; the second stage is when the consumption of the mixed monomer is three Stop reaction when 35% (210g mixed monomer) of all monomer gross weights of the stage; Stop...

Embodiment 2

[0069] Embodiment 2, preparation polyvinylidene fluoride resin

[0070] Add 2800g of deionized water and potassium perfluorooctanoate emulsifier into a 5L vertical kettle (350rpm), then raise the temperature of the polymerization kettle and add VDF monomer. After the temperature of the polymerization kettle reaches 80°C and the pressure of the kettle reaches 1.8MPa, pass The auxiliary pump adds the initiator diethyl peroxydicarbonate and the chain transfer agent ethyl acetate to start the reaction. During the reaction, the addition methods of the monomer, initiator and chain transfer agent are shown in Table 1. Keep the reactor still warm. The pressure is stabilized to the completion of the reaction, wherein, the first stage stops the reaction when the consumption of vinylidene fluoride monomer is 60% (360g VDF) of the total monomer total weight of the three stages; the second stage is when the consumption of the mixed monomer is three Stop reaction when 27% (160g mixed monome...

Embodiment 3

[0073] Embodiment 3, preparation polyvinylidene fluoride resin

[0074] Add 3000g of deionized water and sodium perfluorooctanoate emulsifier into a 5L vertical kettle (rotating speed: 400rpm), then raise the temperature of the polymerization kettle and add VDF monomer. After the temperature of the polymerization kettle reaches 85°C and the pressure of the kettle reaches 2.0MPa, pass Add the initiator tert-butyl peroxypivalate and the chain transfer agent diethyl carbonate to the auxiliary pump to start the reaction. The addition methods of the monomer, initiator and chain transfer agent during the reaction are shown in Table 1. Warm autoclave pressure is stabilized to the completion of reaction, wherein, the first stage stops reaction when the vinylidene fluoride monomer consumption is 70% (420g VDF) of all monomer gross weights of three stages; The second stage is when the mixed monomer consumption Stop reaction when being 20% ​​(120g mixed monomer) of all monomer gross weig...

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Abstract

The invention discloses PVDF (polyvinylidene fluoride) resin as well as a preparation method and an application thereof. The preparation method of PVDF resin comprises steps as follows: the PVDF resinis prepared with a continuous emulsion polymerization method specifically comprising three stages as follows: at the first stage, homopolymerized PVDF resin is obtained through homopolymerization ofvinylidene fluoride monomers; at the second stage: copolymerized PVDF resin is obtained through copolymerization of vinylidene fluoride monomers and modified monomers; at the third stage: homopolymerized PVDF resin and / or copolymerized PVDF resin are / is obtained through homopolymerization of the vinylidene fluoride monomers and / or copolymerization of the vinylidene fluoride monomers and the modified monomers; the PVDF resin is obtained. The PVDF resin has good flexibility and toughness, excellent mechanical performance and barrier performance of the homopolymerized PVDF resin and good processing performance and can be used for preparing a liner of an offshore oil delivery hose.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a polyvinylidene fluoride resin (PVDF) and a preparation method thereof. Background technique [0002] Offshore oil hoses need to deal with very harsh conditions in the process of oil and gas transportation. The lining needs to be in direct contact with crude oil, the delivery temperature is as high as 130°C, and the delivery pressure is also very high (such as up to 70MPa). Therefore, this requires that the lining material has excellent mechanical properties, high temperature resistance and chemical barrier properties. In the process of transportation, installation and work of the hose, it needs to withstand external forces such as bending, impact and twisting under low temperature conditions (such as -20°C), so this requires the lining material to have good flexibility. [0003] In order to meet the above performance requirements, major foreign chemical companies have develope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/22C08F214/22C08F214/24C08F214/28
CPCC08F114/22C08F214/22C08F214/28C08F214/24
Inventor 张恩勇曹静周巍伟裴晓梅李丽玮谢彬贾旭侯静
Owner CHINA NAT OFFSHORE OIL CORP
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