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Polyvinylidene fluoride polymer and preparation method thereof

A technology of polyvinylidene fluoride and self-vinylidene fluoride, which is applied in the field of polyvinylidene fluoride polymers and its preparation, can solve the problems of sacrificing PVDF strength and flexural modulus, and achieve increased rigidity, improved flexibility, and high tensile strength Effect of Strength and Flexural Modulus

Active Publication Date: 2017-02-08
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above modifications can reduce the crystallinity of PVDF resin to a certain extent and improve the flexibility of the resin, but at the same time sacrifice the original excellent strength and flexural modulus of PVDF.

Method used

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  • Polyvinylidene fluoride polymer and preparation method thereof
  • Polyvinylidene fluoride polymer and preparation method thereof
  • Polyvinylidene fluoride polymer and preparation method thereof

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preparation example Construction

[0032] The preparation method of a kind of polyvinylidene fluoride polymer of the present invention, comprises VDF monomer and the aromatic vinyl monomer of formula A in polymerization medium, in organic initiator, dispersant, chain transfer agent and deionized water In the presence of VDF, free radical suspension polymerization is carried out, and then PVDF resin is obtained through washing and drying steps. In the polymerization step, 100 parts by weight of deionized water, 20-34 parts of VDF monomer, and 0.002 parts of monomer (A) ~6 parts, organic initiators are diethyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, tert-butyl peroxyneodecanoate, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate Esters, tert-butyl peroxypivalate, organic initiator is preferably 0.01 to 0.2 parts, dispersant is methyl cellulose ether, hydroxyethyl cellulose ether, hydroxypropyl methyl cellulose ether, polyethylene glycol , the dispersant is preferably 0.005 to 0.05 parts, the...

Embodiment 1

[0045] Add 3000g deionized water, 0.15g dispersant, 0.3g diisopropyl peroxydicarbonate, 1.5g ethyl acetate, 600g VDF monomer, 0.1g α, β, For β-trifluorostyrene monomer, the temperature of the reactor was raised to 60°C for polymerization, and the reaction was terminated after 10 hours. The resulting polymer slurry was filtered and washed and then dried for 10 hours to obtain PVDF resin. After the resin was pressed into tablets, its mechanical properties were measured, and the results are shown in Table 1.

Embodiment 2

[0047] Add 3000g deionized water, 0.3g dispersant, 1.0g tert-butyl peroxypivalate, 3g butyl acetate, 700g VDF monomer, 5g4-bromo-β, For β-difluorostyrene, the temperature of the reactor was raised to 70°C for polymerization, and the reaction was terminated after 8 hours. The resulting polymer slurry was filtered and washed and then dried for 10 hours to obtain PVDF resin. After the resin was pressed into tablets, its mechanical properties were measured, and the results are shown in Table 1.

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Abstract

The invention discloses polyvinylidene fluoride polymer and a preparation method thereof. The polymer comprises a repeating unit derived from vinylidene fluoride (VDF) and a repeating unit derived from at least one kind of aromatic vinyl monomer. The preparation method comprises carrying out free radical suspension polymerization of VDF monomers and aromatic vinyl monomers in the presence of an organic initiator, a dispersant, a chain transferring agent and deionized water, and performing washing and drying to obtain the PVDF resin. The prepared polyvinylidene fluoride is improved in flexibility with high tensile strength and flexural modulus maintained.

Description

technical field [0001] The invention belongs to the technical field of vinylidene fluoride polymers, in particular to a polyvinylidene fluoride polymer and a preparation method thereof. Background technique [0002] PVDF is a high-performance polymer material with excellent mechanical properties, creep resistance, high and low temperature resistance, weather resistance, radiation resistance, chemical corrosion resistance and low flammability. Widely used in petrochemical, metallurgy, pharmaceutical, construction, lithium battery, water treatment, military and aerospace and other fields. [0003] Usually, the crystallinity of PVDF is as high as 50%, which leads to its strong rigidity, poor flexibility, low transparency, etc., which affects its processing and application performance to a certain extent. Therefore, it is necessary to introduce a second monomer for copolymerization modification, so as to obtain PVDF with improved performance. Resin, the most common modified mon...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F212/14C08F212/32C08F2/20C08F2/38
CPCC08F2/20C08F2/38C08F214/22C08F212/14C08F212/32
Inventor 周晓勇陈振华蔡怀勋余晓斌王树华
Owner JUHUA GROUP TECH CENT
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