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1,1-difluoroethylene copolymer and preparation method thereof

A vinylidene fluoride and vinylidene fluoride technology, which is applied in the field of 1,1-vinylidene fluoride copolymer and its preparation, can solve the problems of reducing the use temperature range of the copolymer, unable to process and apply, and prone to chain breakage, etc. Simple and easy preparation method, the effect of maintaining resistance to fracture and excellent low temperature flexibility

Active Publication Date: 2018-06-22
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these copolymers do reduce the crystallinity and improve the low-temperature impact of polyvinylidene fluoride homopolymers, but at the same time the melting temperature of the copolymers is also significantly lower than that of PVDF homopolymers, making the copolymers at the reduced temperature The range is prone to chain breakage, which cannot be processed and applied, which reduces the service temperature range of the copolymer

Method used

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  • 1,1-difluoroethylene copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In a 100L horizontal reactor, add 60L of deionized water, 100g of perfluorooctanoic acid ammonium dispersant, 150g of ethyl acetate, and 100g of paraffin wax with a melting point of about 58°C. The oxygen content is less than 20ppm. Then start stirring, raise the temperature in the reactor to 75°C, add vinylidene fluoride monomer to the pressure in the reactor to 3MPa, add the initiator to oxidize dialkyl dicarbonate (the solvent for configuring the initiator solution is CFC-113) 100g started the reaction. Continue to add vinylidene fluoride monomer to maintain the pressure, and add 20 g of oxidized dialkyl dicarbonate successively in different stages until the amount of VDF monomer added reaches 6000 g (accounting for 63.8% of the VDF used in the examples). Thereafter, within 20 minutes, 600 g of hexafluoropropylene monomer was added to the reactor, while the feeding of vinylidene fluoride monomer was continued, and the reaction was continued until the total amount of...

Embodiment 2

[0038]In a 100L horizontal reactor, add 60L of deionized water, 100g of perfluorooctanoic acid ammonium dispersant, 150g of ethyl acetate, and 100g of paraffin wax with a melting point of about 58°C. The oxygen content is less than 20ppm. Then start stirring, raise the temperature in the reactor to 75°C, add vinylidene fluoride monomer to the pressure in the reactor to 3MPa, add the initiator to oxidize dialkyl dicarbonate (the solvent for configuring the initiator solution is CFC-113) 100g started the reaction. Vinylidene fluoride monomer was continuously added to maintain the pressure, and 20 g of oxidized dialkyl dicarbonate was sequentially added in different stages until the amount of VDF monomer added reached 8000 g (accounting for 86% of the VDF used in the examples). Thereafter, within 20 minutes, 700 g of hexafluoropropylene monomer was added into the reactor, while the feeding of vinylidene fluoride monomer was continued, and the reaction was continued until the tot...

Embodiment 3

[0040] In a 100L horizontal reactor, add 60L of deionized water, 100g of perfluorooctanoic acid ammonium dispersant, 150g of ethyl acetate, and 100g of paraffin wax with a melting point of about 58°C. The oxygen content is less than 20ppm. Then start stirring, raise the temperature in the reactor to 75°C, add vinylidene fluoride monomer to the pressure in the reactor to 3MPa, add the initiator to oxidize dialkyl dicarbonate (the solvent for configuring the initiator solution is CFC-113) 100g started the reaction. Continue to add vinylidene fluoride monomer to maintain the pressure, and add 20 g of oxidized dialkyl dicarbonate sequentially in different stages until the amount of VDF monomer added reaches 7000 g (accounting for 75.68% of the VDF used in the examples). Thereafter, within 20 minutes, 750 g of hexafluoropropylene monomer was added into the reactor, while the feeding of vinylidene fluoride monomer was continued, and the reaction was continued until the total amount...

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Abstract

The invention relates to a 1,1-difluoroethylene copolymer and a preparation method thereof, and belongs to the technical field of fluorine chemicals. The 1,1-difluoroethylene copolymer is a heterogeneous polymer containing a plurality of continuous phases and is prepared from (a) 60 to 80 percent of first continuous polymer phase which contains 95 to 100 percent of vinylidene fluoride monomeric unit and 0 to 5 percent of other fluorine-containing monomeric units and (b) 20 to 40 percent of second continuous polymer phase which contains 65 to 85 percent of the vinylidene fluoride monomeric unitand 15 to 35 percent of comonomer unit, wherein a comonomer is one or two of hexafluoropropylene and perfluoropropyethyl ether. The 1,1-difluoroethylene copolymer disclosed by the invention has excellent low-temperature flexibility and high melting temperature. The invention also provides a simple and feasible preparation method, which improves the crystallinity of polyvinylidene fluoride and improves flexibility; meanwhile, the copolymer has high melting temperature and good solvent resistance.

Description

technical field [0001] The invention relates to a 1,1-difluoroethylene copolymer and a preparation method thereof, belonging to the technical field of fluorine chemical industry. Background technique [0002] Polyvinylidene fluoride (PVDF) is a highly crystalline, chemically resistant engineering thermoplastic fluoropolymer, and its typical application temperature range is -15°C to 150°C. Although the glass transition temperature (Tg) of PVDF resin obtained by testing low-temperature performance is close to -39°C, in practical applications, the low-temperature range of PVDF used in impact applications is generally higher than its Tg. As the use temperature approaches the glass transition temperature, PVDF resin becomes more and more brittle, resulting in poor low temperature impact resistance. PVDF is also rigid at lower temperatures and its flexibility gradually decreases. Low temperature impact resistance and flexibility are especially important for pipes, hoses and othe...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/28C08F2/00
CPCC08F2/001C08F214/22C08F214/28
Inventor 王汉利唐妮杜延华李秀芬许克韩瑞芹
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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