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Fluoropolymer and composition thereof

a technology of fluororesin and polymer, applied in the field of fluororesin, can solve the problems of poor moldability, workability, mechanical characteristics and creep characteristics, inferior from the economic viewpoint, and high cost of fluororesin, and achieve the effects of high moldability, stress cracking resistance, and high production efficiency

Inactive Publication Date: 2006-04-27
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] In view of the above-discussed state of the art, it is an object of the present invention to provide a fluoropolymer capable of giving fluorine-containing molded materials and laminates excellent in moldability, productivity, interlaminar bonding and stress cracking resistance, in particular stress cracking resistance upon contacting with various liquid chemicals, without impairing such characteristics intrinsic in fluororesins as chemical resistance, solvent resistance, weathering resistance, antifouling properties, liquid chemical impermeability and nonstickiness.

Problems solved by technology

However, fluororesins are expensive and are inferior in moldability, workability, mechanical characteristics and creep characteristics, among others.
However, this technology, which consists in irradiating the surface of the moldings obtained by molding of a fluororesin with radiation and then bonding thereto a polyamide resin layer in the manner of lamination, is complicated in procedure and inferior from the economical viewpoint since it requires an irradiation apparatus.
However, that method has a problem.
Namely, due to the use of a polyamide resin and a fluorine resin, which are poor in mutual compatibility, as the adhesive layer, the morphology of the adhesive layer varies depending on the molding conditions, use temperature and other environmental conditions, so that the cohesive force within the adhesive layer and the bond strength between the adhesive layer and the neighboring layers change accordingly, hence no quality stability can be secured.
However, there is a problem in that even the use of this fluorine-containing ethylenic polymer results in unsatisfactory levels of bond strength.
These liquid chemicals are highly penetrative into fluororesins and cause cracking thereof.
Further, when they come into contact with such liquid chemicals as solvents, inorganic acids, alkaline aqueous solutions, gasoline, and ozone-containing water with the stress hung, fluororesins are susceptible to cracking, and this is a matter of concern especially when they are used in the form of piping tubes in automobiles and the like or tubes for transport liquid chemicals, among others.
However, the stress cracking resistance of fluororesins will not be satisfactorily improved in spite of increases in molecular weight but rather the viscosity thereof becomes very high and the critical shear rate decreases, so that the productivity lowers.
Another problem is that moldings obtained by injection molding, among others, show a defective appearance called melt fracture.
Thus, in the art, there are no fluororesins available capable of providing moldings or laminates excellent in moldability, productivity, interlaminar bond strength and stress cracking resistance without impairing such characteristics as chemical resistance, oil resistance, low liquid chemical permeability and heat resistance.

Method used

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  • Fluoropolymer and composition thereof
  • Fluoropolymer and composition thereof

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

Synthesis of a Carbonate Group-Containing, Fluorine-Containing Cohesive Ethylenic Polymer (F-A)

[0202] A 1,280-L autoclave was charged with 380 L of distilled water and, after thorough nitrogen substitution, further charged with 84 kg of perfluorocyclobutane, 166 kg of hexafluoropropylene and 0.5 kg of perfluoro(1,1,5-trihydro-1-pentene), and the system inside was maintained at 26° C. and at a rate of stirring of 200 rpm. Then, tetrafluoroethylene was charged into the autoclave under pressure until 0.86 MPa and, further, ethylene was charged thereinto until 0.92 MPa. The system inside temperature was raised to 35° C., followed by addition of 8.5 kg of a 50% methanol solution of di-n-propyl peroxydicarbonate to initiate the polymerization reaction. The system inside pressure was maintained at 1.15 MPa by continuously feeding a mixed gas composed of tetrafluoroethylene, ethylene and hexafluoropropylene in the mole percentage ratio of 41.0:44.0:15.0, since otherwise the system inside p...

synthesis example 2

Synthesis of a Carbonate Group-Containing, Fluorine-Containing Cohesive Ethylenic Polymer (F-B)

[0205] The same autoclave as used in Synthesis Example 1 was charged with 380 L of distilled water and, after thorough nitrogen substitution, further charged with 166 kg of perfluorocyclobutane, 84 kg of hexafluoropropylene and 0.3 kg of perfluoro(1,1,5-trihydro-1-pentene), and the system inside was maintained at 35° C. and at a rate of stirring of 200 rpm. Then, tetrafluoroethylene was charged into the autoclave under pressure until 0.88 MPa and, further, ethylene was charged thereinto until 0.94 MPa, followed by further addition of 9.0 kg of a 50% methanol solution of di-n-propyl peroxydicarbonate to initiate the polymerization reaction. The system inside pressure was maintained at 0.94 MPa by continuously feeding a mixed gas composed of tetrafluoroethylene, ethylene and hexafluoropropylene in the mole percentage ratio of 46.0:44.0:10.0, since otherwise the system inside pressure would ...

synthesis example 3

Synthesis of a Carbonate Group-Containing, Fluorine-Containing Cohesive Ethylenic Polymer (F-C)

[0207] The same autoclave as used in Synthesis Example 1 was charged with 380 L of distilled water and, after thorough nitrogen substitution, further charged with 230 kg of perfluorocyclobutane and 0.9 kg of perfluoro(1,1,5-trihydro-1-pentene), and the system inside was maintained at 20° C. and at a rate of stirring of 200 rpm. Then, tetrafluoroethylene was charged into the autoclave under pressure until 0.78 MPa and, further, ethylene was charged thereinto until 0.89 MPa and, after raising the system inside temperature to 35° C., 1.1 kg of cyclohexane was added, followed by addition of 1.6 kg of a 50% methanol solution of di-n-propyl peroxydicarbonate to initiate the polymerization reaction. The system inside pressure was maintained at 1.20 MPa by continuously feeding a mixed gas composed of tetrafluoroethylene and ethylene in the mole percentage ratio of 57:43, since otherwise the syste...

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Abstract

The present invention provides a fluoropolymer capable of giving fluorine-containing molded materials and laminates excellent in moldability, productivity, interlaminar bonding and stress cracking resistance, in particular stress cracking resistance upon contacting with various liquid chemicals, without impairing such characteristics intrinsic in fluororesins as chemical resistance, solvent resistance, weathering resistance, antifouling properties, liquid chemical impermeability and nonstickiness. The present invention provides a fluoropolymer which is an oligomer-containing or oligomer-free fluoropolymer, wherein said oligomer has a molecular weight not higher than 10,000 and amounts to not more than 0.05% by mass relative to the fluoropolymer.

Description

TECHNICAL FIELD [0001] The present invention relates to a fluoropolymer as well as a fluorine-containing molded material, a laminate and a fluorine-containing fabricated article, each comprising the fluoropolymer. BACKGROUND ART [0002] Fluororesins are excellent in such characteristics as heat resistance, oil resistance, chemical resistance, mold release characteristics, lubricating properties and liquid chemical impermeability. However, fluororesins are expensive and are inferior in moldability, workability, mechanical characteristics and creep characteristics, among others. To solve these problems, resin laminates comprising a fluororesin layer and a non-fluororesin material layer have been proposed. [0003] For example, Japanese Kokai Publication H05-8353 discloses a laminated tube comprising an outer layer made of a polyamide resin and an inside layer made of a fluororesin. This patent document discloses a technology comprising introducing a crosslinking structure between the pol...

Claims

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Application Information

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IPC IPC(8): B32B1/08C08F14/18
CPCB32B1/08B32B27/08C08F6/04C08F14/18C08F214/18Y10T428/254C08J5/18C08J2327/12C08F214/26Y10T428/139C08L27/12Y10T428/31544Y10T428/31935Y10T428/3154B32B15/08B32B2597/00B32B27/20
Inventor KITAHARA, TAKAHIROKINO, TOMOHIROSATO, MEGUMIFUJITA, EIJI
Owner DAIKIN IND LTD
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