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Compound based on viylidene difluoride

A technology of vinylidene fluoride and composition, applied in the field of polymers, which can solve the problems of high permeability, high amount of elastomer, lack of thermal and chemical stability, etc.

Inactive Publication Date: 2003-09-24
ATOFINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multiaxial impact strength of these compositions is very good, but the amount of elastomer used (Examples 6 and 11) at 26.6 or 50 parts by weight per 100 parts by weight of PVDF1000 is so high that these compositions lack thermal and chemical stability at 150°C sex
In addition, these compositions have the disadvantage of high permeability under pressure and poor resistance to rapid decompression ("foaming") of hot pressurized gases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Using a single screw extruder (L / D=33, compression ratio=3.5) adjusted to 220°C with a diameter of 40mm, one of the elastomers B1, B2, B5-B7 and the plasticizer C1 were extruded. The composition ( Ai Bj Ck x) contains at least one fluoropolymer A4, A5 or A7. Based on the respective proportions of the components, the composition is called α, χ, Φ, η and γ.

[0055] Table 1 shows the melt flow index of fluoropolymer Ai and its critical modulus G c The fluoropolymer Ai is a VF2 homopolymer or a VF2 copolymer; according to the ISO 1133 standard, the melt flow index MF1 is measured at 230°C under a load of 5 kg, and with the aid of a dynamic mechanical spectrometer, such as Rheometrics RMS800 dynamic Mechanical spectrometer, using a plane-plane viscometer with a diameter of 25mm to measure the critical modulus G at 190℃ c .

[0056] Table 2 shows the chemical properties, trade name and supplier of elastomer Bj.

[0057] Table 3 shows the chemical properties and family of the pla...

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PUM

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Abstract

Disclosed is a flexible and tough composition comprising: at least one vinylidene fluoride (VF2) homopolymer (A) or a copolymer (A) of VF2 and at least one other monomer copolymerizable with VF2, wherein said monomers are present in an amount between 0 and 30 parts by weight per 100 parts by weight of VF2, at least one fluoroelastomer B, optionally a plasticizer C. Wherein, in one aspect, the composition comprises 0.5-10 parts by weight of B and 0-10 parts by weight of C per 100 parts by weight of A, with the additional proviso that the sum of B and C is 0.5-10.5 parts by weight, and in another aspect, The vinylidene fluoride homopolymer or copolymer (A) is selected in such a way that it has a melt flow index of less than 5 g / 10 min measured under a load of 5 kg at 230° C. according to the ISO 1133 standard, and measured at 190° C. The critical modulus Gc at the intersection of the melt shear moduli G' and G" is between 5 and 22 kPa. The composition is especially useful in the production of pipelines for transporting hydrocarbons.

Description

Technical field [0001] The present invention relates to the field of polymers and its subject is a composition based on polyvinylidene fluoride. [0002] Fluorine-containing homopolymers and fluorine-containing copolymers are due to their good heat resistance, chemical resistance, especially solvent resistance, weather resistance and radiation resistance (UV, etc.), their impermeability to gases and liquids, and their The electrical insulation properties are well known. They are especially used in production pipelines to transport hydrocarbons extracted from sediments at sea or on land. Sometimes hydrocarbons are transported at high temperature (about 135° C.) and under high pressure (for example, 70 MPa), so during the installation operation, serious problems related to the mechanical, thermal, and chemical resistance of the materials used may occur. Before or after maintenance, additional requirements are imposed on them. Therefore, during the production of the pipeline, its lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/08C08K5/00C08K5/11C08K5/435C08L27/16
CPCC08F14/08C08K5/11C08K5/435C08L27/16C08L2205/02C08L2666/04
Inventor 蒂里·帕斯卡尔布鲁诺·施伦德
Owner ATOFINA