Method and plant for etching a fluoropolymer substrate
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B44C-001/22
C03C-015/00
C03C-025/68
C23F-001/00
C08J-007/14
B01D-061/02
출원번호
US-0022150
(2013-10-10)
등록번호
US-9481773
(2016-11-01)
국제출원번호
PCT/IT2013/000280
(2013-10-10)
국제공개번호
WO2015/052736
(2015-04-16)
발명자
/ 주소
Villano, Massimo
Stella, Pasquale
출원인 / 주소
GUARNIFLON S.P.A.
대리인 / 주소
MacMillan, Sobanski & Todd, LLC
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
(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 m
(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.
대표청구항▼
1. A (semi-)continuous etching method for increasing the surface adhesion of a fluoropolymer substrate (10) comprising, in sequence, the steps of: feeding (22) a fluoropolymer substrate (10) in the form of continuous ribbon or film along a feeding direction (X), said substrate defining a primary sur
1. A (semi-)continuous etching method for increasing the surface adhesion of a fluoropolymer substrate (10) comprising, in sequence, the steps of: feeding (22) a fluoropolymer substrate (10) in the form of continuous ribbon or film along a feeding direction (X), said substrate defining a primary surface (12);subjecting to one or more etching operations (2) at least a part of the primary surface (12) by means of an adhesion-promoting solution comprising a complex of an alkali metal, such as sodium, in naphthalene;washing (4) the part of the primary surface (12) wetted by the adhesion-promoting solution by means of a washing solution (42) comprising aqueous acetic acid or formic acid;selectively separating a concentrated solution (24) of acetic acid or of formic acid from the washing solution (42) by means of inverse osmosis operations (6, 8) at increasing pressure;re-introducing at least a portion of the concentrated solution (24) of acetic acid or of formic acid in the washing solution (42) to create a recirculation. 2. Method according to claim 1, wherein a subsequent operation of inverse osmosis (8) takes place at a pressure 2-10 times the pressure of a previous operation (6). 3. Method according to claim 1, wherein the separation step comprises a first (6) and a second (8) operation of inverse osmosis, the second operation being conducted on a first concentrated fraction (44) coming from the first operation. 4. Method according to claim 3, wherein a first permeated fraction (46) of the first inverse osmosis operation (6) is subjected to one or more steps selected from the group consisting in oxidation, bacterial oxidation, ultrafiltration, immersed membrane ultrafiltration, reuse and/or drainage. 5. Method according to claim 3, wherein a second permeated fraction (48) of the second inverse osmosis operation (8) forms the concentrated solution (24) of acetic acid or of formic acid. 6. Method according to claim 1, wherein the step of washing (4) with the washing solution (42) is preceded by a first step of pre-washing (14) in an organic phase comprising diethylene glycol dimethyl ether, and by a second step of pre-washing (16) in an aqueous phase, for example with water at a temperature above ambient temperature. 7. Method according to claim 6, wherein said organic phase may be purified by means of distillation (18) and re-introduced in the first pre-washing step (14). 8. Method according to claim 1, wherein the adhesion-promoting solution is produced by means of a reaction in situ (20, 20′) between diethylene glycol dimethyl ether, the alkali metal and naphthalene. 9. Method according to claim 1, comprising at least one synthesis reactor (20, 20′) wherein the adhesion-promoting solution is produced by means of a reaction in situ between diethylene glycol dimethyl ether, alkali metal and naphthalene, said reactor being fluidically connected to the etching tank (2) or to the plurality thereof. 10. Method according to claim 1, wherein the fluoropolymer is selected from the group consisting in fluorinated ethylene propylene, perfluoroalkoxy, polyvinylidene fluoride and mixtures thereof. 11. A (semi-)continuous etching plant (1) for increasing the surface adhesion of a fluoropolymer substrate (10) comprising: feeding means (22) of the fluoropolymer substrate (10) in the form of a continuous ribbon or film along a feeding direction (X), said substrate defining a primary surface (12);one or more etching tanks (2) containing an adhesion-promoting solution comprising a complex of an alkali metal in naphthalene for the chemical etching of at least a part of the primary surface (12);a removal bath (4) of the adhesion-promoting solution from the part of the primary surface (12) wetted by said solution, said removal bath containing a washing solution (42) comprising aqueous acetic acid or aqueous formic acid;inverse osmosis stations (6, 8) working at increasing pressure, configured to selectively separate a concentrated solution (24) of acetic acid or of formic acid from the washing solution (42);means for re-introducing (26) at least a portion of the concentrated solution (24) of acetic acid or of formic acid in the washing solution (42) to create a recirculation. 12. Plant according to claim 11, wherein at least one inverse osmosis station (6; 8) comprises a multi-layer separation membrane comprising a non-woven support layer, an intermediate micro-porous layer, and a protective layer of the intermediate layer. 13. Plant according to claim 12, wherein the support layer comprises polyester, the intermediate layer is polysulfonic and wherein the protective layer is a coating, preferably having a thickness of approximately 2500 Ångstrom or less, applied to the intermediate layer. 14. Plant according to claim 11, wherein a first (6) and a second (8) inverse osmosis stations are respectively positioned upstream and downstream of a second collection environment (30), configured to receive a first concentrated fraction (44) from the first inverse osmosis station (6), and to send to the removal bath (4) a second permeated fraction (48) of the second inverse osmosis operation (8) which forms the concentrated solution (24) of acetic acid or of formic acid. 15. Plant according to claim 11, comprising, upstream of the removal bath (4) of the adhesion-promoting solution, a first pre-washing bath (14) in an organic phase comprising diethylene glycol dimethyl ether, and a second pre-washing bath (16) in an aqueous phase, for example containing water at a temperature above ambient temperature. 16. Plant according to claim 11, comprising a plurality of return calenders (28, 28′) of the continuous fluoropolymer substrate (10), positioned along the feed direction (X) to immerse said substrate (10) in the adhesion-promoting solution and/or in the washing solution (42), and optionally in the organic phase and/or aqueous phase. 17. Plant according to claim 15, comprising a plurality of return calenders (28, 28′) of the continuous fluoropolymer substrate (10), positioned along the feed direction (X) to immerse said substrate (10) in the adhesion-promoting solution and/or in the washing solution (42), and optionally in the organic phase and/or aqueous phase. 18. Plant according to claim 15, comprising distillation means (18) of the organic phase, fluidically communicating with the first pre-washing bath (14) so as to create a secondary recirculation. 19. Plant according to claim 11, wherein the fluoropolymer is selected from the group consisting in fluorinated ethylene propylene, perfluoroalkoxy, polyvinylidene fluoride and mixtures thereof.
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이 특허에 인용된 특허 (2)
Beholz Lars Guenter, Process for producing paintable polymeric articles.
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