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Chlorotrifluoroethylene copolymer containing laminate and process for production thereof

A technology of chlorotrifluoroethylene and its manufacturing method, which is applied in the field of laminates and can solve the problems of low permeability, reduction, and thermal deterioration of chemical liquids, etc.

Inactive Publication Date: 2008-03-05
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although it is preferable to form the laminate by coextrusion molding, since the melting point of PFA and FEP is high and the melting point of PCTFE is low, heat resistance and stress crack resistance during molding are deteriorated, so in coextrusion molding When using PCTFE, there are problems of thermal deterioration and low permeability to chemical liquids.

Method used

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  • Chlorotrifluoroethylene copolymer containing laminate and process for production thereof
  • Chlorotrifluoroethylene copolymer containing laminate and process for production thereof

Examples

Experimental program
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Effect test

Synthetic example 1

[0135] Add 392kg of demineralized pure water into a jacketed stirring polymerization tank capable of holding 1320kg of water, fully replace the inner space with pure nitrogen, and then vacuum out the nitrogen. Then press 307kg of octafluorocyclobutane, 5.8kg of chlorotrifluoroethylene [CTFE], 49.6kg of tetrafluoroethylene [TFE], and 27.7kg of perfluoro(propyl vinyl ether) [PPVE], and adjust the temperature to 35°C , start stirring. 0.8 kg of a 50% by mass methanol solution of di-n-propylperoxydicarbonate [NPP] was added thereto as a polymerization initiator to initiate polymerization. During the polymerization, add the mixed monomer (CTFE:TFE:PPVE (mol%)=25:73:2) whose composition is adjusted to be the same as that of the required copolymer to maintain the pressure in the polymerization tank at 0.80MPa, and simultaneously polymerize to The ratio of the total additional amount to the solvent was 70% by mass. Then, the remaining gas in the polymerization tank was discharged, an...

Synthetic example 2

[0137] Add 392kg of demineralized pure water into a jacketed stirring polymerization tank capable of holding 1320kg of water, fully replace the inner space with pure nitrogen, and then vacuum out the nitrogen. Then press in 307kg of octafluorocyclobutane, 8.3kg of chlorotrifluoroethylene [CTFE], 49.6kg of tetrafluoroethylene [TFE], and 29.0kg of perfluoro(propyl vinyl ether) [PPVE], and adjust the temperature to 35°C , start stirring. 0.8 kg of a 50% by mass methanol solution of di-n-propylperoxydicarbonate [NPP] was added thereto as a polymerization initiator to initiate polymerization. During the polymerization, add the mixed monomer (CTFE:TFE:PPVE (mol%)=28:70:2) whose composition is adjusted to be the same as that of the required copolymer to maintain the pressure in the polymerization tank at 0.80MPa, and simultaneously polymerize to The ratio of the total additional amount to the solvent was 70% by mass. Then, the remaining gas in the polymerization tank was discharged,...

Synthetic example 3

[0139] Add 392kg of demineralized pure water into a jacketed stirring polymerization tank capable of holding 1320kg of water, fully replace the inner space with pure nitrogen, and then vacuum out the nitrogen. Then press in 307kg of octafluorocyclobutane, 18kg of chlorotrifluoroethylene [CTFE], 35kg of tetrafluoroethylene [TFE], and 22kg of perfluoro(propyl vinyl ether) [PPVE], adjust the temperature to 35°C, and start stirring . 3.2 kg of a 50% by mass methanol solution of di-n-propylperoxydicarbonate [NPP] as a polymerization initiator was added thereto to initiate polymerization. During the polymerization, add the mixed monomer (CTFE:TFE:PPVE (mol%)=37:61:2) whose composition is adjusted to be the same as that of the required copolymer to maintain the pressure in the polymerization tank at 0.69MPa, and simultaneously polymerize to The ratio of the total additional amount to the solvent was 70% by mass. Then, the remaining gas in the polymerization tank was discharged, and ...

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Abstract

A chlorotrifluoroethylene (CTFE) copolymer containing laminate which is produced by coextruding a layer of tetrafluoro- ethylene / perfluoro vinyl ether copolymer (PFA) and / or a tetra- fluoroethylene / hexafluoropropylene copolymer (FEP) and a CTFE copolymer layer with the latter being inhibited from thermal deterioration and which is improved in the resistance to permeation of chemical fluids and so on; and a process for the production of the laminate. The invention relates to a CTFE copolymer containing laminate comprising a layer (A) of PFA and / or FEP and a layer (B) of a CTFE copolymer, characterized by being produced by coextruding the layers (A) and (B) under such conditions that in the stage before the contact of material (a) for the layer (A) with material (b) for the layer (B) in a multilayer die, the temperature of a passageway (pa) through which the material (a) flows lies within the range of 300 to 400 DEG C and the temperature of a passageway (pb) through which the material (b) flows lies within the range of 250 to 350 DEG C.

Description

technical field [0001] The present invention relates to a laminate containing a chlorotrifluoroethylene copolymer and a method for producing the same. Background technique [0002] Molded products such as pipes containing tetrafluoroethylene / perfluorovinyl ether copolymer [PFA] or tetrafluoroethylene / hexafluoropropylene [FEP] have chemical resistance and are less likely to contaminate liquids passing through them, so they have been used until now. It is used as a piping material for conveying high-purity liquids, as a lining material for storage tanks, especially as a piping material for semiconductor manufacturing equipment, etc. However, the PFA tube and the FEP tube have a problem of high chemical liquid permeability. [0003] Polychlorotrifluoroethylene [PCTFE] is mentioned as an outer tube material that is bonded to conventional PFA tubes, FEP tubes, etc. in order to improve the low permeability of chemical liquids (for example, refer to Patent Document 1). However, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B29C47/06B32B1/08C08F214/18
Inventor 北原隆宏下野武司青山高久榊原进吾
Owner DAIKIN IND LTD
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