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Method and plant for etching a fluoropolymer substrate

A technology for fluoropolymers and substrates, applied in the direction of surface etching compositions, chemical instruments and methods, membranes, etc., can solve the problems of not allowing safe storage of etching solutions, unsatisfactory safety, etc.

Active Publication Date: 2015-11-04
谷阿尼弗朗股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the variant using ammonia does not allow safe storage of the etching solution, given the low boiling point of the mixture (approximately -31 °C); conversely, THF, although stable at room temperature, is extremely flammable
[0006] Even the methods proposed later proved to be considerably less than ideal from an environmental point of view or with regard to process safety

Method used

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  • Method and plant for etching a fluoropolymer substrate
  • Method and plant for etching a fluoropolymer substrate
  • Method and plant for etching a fluoropolymer substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Example 1: Synthesis of viscosifying solutions.

[0066] In a container containing 200 liters, at a temperature of 50-60° C. with constant stirring, the first quantity of diethylene glycol dimethyl ether (technical titer) in an amount of about 80-180 kg and about 5 - 50 kg (eg 15-35 kg) of a second quantity of sodium naphthalene in a sodium to naphthalene ratio of 1:1 or 2:1 mixed together. This variation in weight is mostly due to the quality of the etch or the goal to be achieved. The mixture is reacted for a period of about 1-6 hours or 2-4 hours, and then fed to an etch tank or tanks.

Embodiment 2

[0067] Example 2: Synthesis of washing solution.

[0068] The wash solution is prepared by mixing about 100 liters of water until a volume of 99.9% acetic acid solution with a pH of about 2-6, preferably 3-5, eg about 4 is obtained.

[0069] The initial concentration of acetic acid in the removal tank before starting to wash the major surfaces is essentially the same as that obtained at the end of the second reverse osmosis stage when the plant was running.

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Abstract

(Semi-) continuous etching method for a fluoropolymer substrate (10) comprising steps of feeding (22) said substrate (10) in the form of a continuous ribbon wherein said substrate defines a primary surface (12), subjecting to at least one etching operations (2) a part of the primary surface (12) by means of an adhesion-promoting solution comprising a complex of an alkali metal in naphthalene, washing (4) the primary surface (12) wetted by the adhesion-promoting solution by means of a washing solution (42) comprising aqueous acetic acid / formic acid, and selectively separating a concentrated solution (24) of acetic acid / formic acid from the washing solution (42) by means of inverse osmosis operations (6, 8) at ■ increasing pressures, and re-introducing at least a portion of the concentrated solution (24) of acetic acid / formic acid in the washing solution (42) to create a recirculation. The invention further relates to an etching plant.

Description

technical field [0001] The present invention relates to methods and apparatus for processing fluoropolymer substrates and, in particular, to methods / apparatus for etching fluoropolymer substrates to increase the surface adhesion of such substrates. Background technique [0002] The chemical resistance of polytetrafluoroethylene (PTFE) is a feature that has made such fluoropolymers highly desirable in the chemical industry, for example for coating reactors or pipes in the presence of their naturally aggressive reactions. PTFE has replaced asbestos - now banned by law due to its carcinogenicity - in a number of applications such as eg coating high temperature cables. Furthermore, the biocompatibility of PTFE has led to its use by the biomedical industry in the manufacture of implantable components as well as in medical devices for use in the human body. The unique properties of the dielectric properties of fluoropolymers in general, and of PTFE in particular, have allowed the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/02B01D61/58B29C71/00C08J7/14C09K13/02
CPCC08J7/02B01D61/025B01D61/58B01D69/12B01D2311/06B01D2311/25B01D2311/2634B01D2311/2688C08J7/14C09K13/02B01D69/1071B01D69/1213B01D2311/263B01D2311/2669C08J2327/18
Inventor 马西莫·维拉诺帕斯夸莱·斯泰拉
Owner 谷阿尼弗朗股份公司