EP3559320A1 - Beizlösung zum beizen von kunststoffen - Google Patents
Beizlösung zum beizen von kunststoffenInfo
- Publication number
- EP3559320A1 EP3559320A1 EP17825528.7A EP17825528A EP3559320A1 EP 3559320 A1 EP3559320 A1 EP 3559320A1 EP 17825528 A EP17825528 A EP 17825528A EP 3559320 A1 EP3559320 A1 EP 3559320A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pickling
- pickling solution
- solution
- manganese
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
- C23C18/22—Roughening, e.g. by etching
- C23C18/24—Roughening, e.g. by etching using acid aqueous solutions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/14—Chemical modification with acids, their salts or anhydrides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
Definitions
- the present invention relates to a pickling solution for pickling plastics, their use, and a method using the pickling solution and the plastic obtainable by this method.
- Plastic surfaces are often coated for technical or decorative reasons with suitable metal layers. In the case of technically conditioned coatings, for example, this can be done in order to form electrically conductive structures on the plastic surfaces.
- electrically conductive structures are widely used.
- conductive structures are deposited on plastic boards by means of suitable methods by means of metal deposition.
- plastic surfaces are treated with sulfuric acid chromium (VI) -containing pickling solutions.
- chromosulfuric acid-based pickling solutions may, for example, comprise chromium (VI) oxide and sulfuric acid in a weight ratio of 1: 1.
- chromium (VI) -containing compounds are suspected of being carcinogenic, so that the handling of these compounds is subject to strict regulations. Due to the hazardous potential emanating from chromium (VI) compounds, even a ban on the commercial use of compounds containing chromium (VI) can not be ruled out.
- chromium (VI) -containing pickling for plastic surfaces are pickling based on permanganates.
- pickling solutions based on alkali permanganates, preferably potassium permanganate, and a mineral acid such as phosphoric acid are used.
- the pickling solutions prepared in this way are free of chromium (VI) -containing compounds and show good pickling action for plastic surfaces, in particular for surfaces of acrylonitrile-butadiene-styrene copolymer (ABS) plastics and ABS polycarbonate plastics.
- Alkali permanganate-based mordants typically have up to 20 g / l of alkali permanganate in corresponding mineral acid solutions such as 40-85% phosphoric acid.
- the alkali permanganate used is subject to a rapid self-decomposition, so that the pickling of a freshly prepared Alkalipermanganatbeize is no longer sufficient after a few hours.
- the stain which has lost its pickling effect, can be readjusted by the addition of alkali permanganate until finally the pickling solution has to be discarded, since a successful pickling of plastics is no longer achieved.
- the vanadium compound contained is a vanadium (V) compound.
- V vanadium
- This can e.g. be contained in the form of vanadium pentoxide or vanadium (V) oxide trihalogenid.
- the use of vanadium pentoxide or vanadium (V) oxide trichloride is particularly preferred.
- the acids can be used, which have also been used in pickling solutions; preferred examples are oxidizing acids selected from sulfuric acid, peroxomonosulfuric acid and peroxodisulfuric acid, phosphoric acid, perchloric acid and mixtures thereof.
- Alkylsulfonic acid especially methanesulfonic acid, arylsulfonic acid and mixtures thereof are not oxidizing acids.
- a mixture of acids is used.
- Preferred combinations are an acid selected from sulfuric acid, peroxomonosulfuric acid and peroxodisulfuric acid with an acid selected from alkyl or arylsulfonic acid.
- a preferred combination contains sulfuric acid and methanesulfonic acid.
- Combinations of three or more oxidizing acids are also suitable. At least 25% by weight of the solution is alkylsulfonic acids, arylsulfonic acids or mixtures thereof.
- the content of alkylsulfonic acids, arylsulfonic acids and mixtures thereof is preferably at least 27% by weight or at least 30% by weight or at least 35% by weight or at least 40% by weight or at least 45% by weight or at least 50% by weight, in each case based on the pickling solution.
- the pickling solution of the invention is chromium-free, i. the content of chromium in the solution is ⁇ 0.01 g / l, preferably ⁇ 0.001 g / l, more preferably ⁇ 0.0001 g / l, each measured at 20 ° C as chromium.
- the proportion of oxidizing acids in the pickling solution is at least 10 wt .-%.
- the content of acids is at least 50 wt .-%, more preferably at least 80 or at least 90 wt .-%.
- the contents of acids always refer to the anhydrous acids. If, for example, 1 kg of 70% strength acid is used, the proportion is calculated as 700 g.
- the proportion of the vanadium compound is in a range of 0.1 to 2 g / l.
- the amount is measured as vanadium pentoxide and the volume is measured at 20 ° C.
- the pickling solution additionally contains manganese ions. Suitable amounts of manganese are in the range of 1 to 10 g / l, measured at 20 ° C, the manganese is calculated as manganese. In one embodiment, a manganese concentration of 2 to 9 g / l, preferably 4 to 8 g / l in the pickling solution.
- concentration data for manganese and manganese compounds always refer to the mass of the manganese itself, not to the mass of the entire compound, unless otherwise stated. All data on volumes in this application refer to volumes at a temperature of 20 ° C.
- the manganese is present at least partially in the + VII oxidation state.
- the formation of Mn (VII) ions is preferred by a so-called oxamate, an oxidation cell with an anode and cathode space separated by a diaphragm.
- a ceramic diaphragm can be used for separation of anode and cathode space.
- the cathode compartment contains the same acid mixture as in the stain itself, but without manganese salt addition.
- Mn (II) can be formed at the anode of Mn (II).
- the pickling process reduces Mn (VII) to Mn (IV).
- Mn (IV) can be reduced to Mn (II), which can then be oxidized back to Mn (VII).
- the rate of formation of Mn (VII) ions can be controlled.
- the content of manganese in the oxidation state + VII for example, at 100 to 600 mg / l, determined as permanganate (Mn0 4 " ) at 20 ° C, are.
- vanadium seems to slow down the otherwise occurring decomposition of permanganate solution. It acts as a stabilizer.
- vanadium in combination with permanganate presumably in the form of V0 2 + , attacks the plastic surface.
- additional one or more further stabilizers may be included.
- alkali and alkaline earth sulfates are suitable.
- Preferred stabilizers are selected from the group consisting of potassium sulfate, magnesium sulfate anhydrate, and sodium sulfate, or mixtures thereof.
- Alkali sulphates are particularly suitable, they then also provide the counterion to the permanganate.
- the water content of the pickling solution is typically small, it should not be more than 20 wt .-%, preferably not more than 10 wt .-% amount. Preferably, the content of water is 8% by weight or less, or 5% by weight or less.
- the temperature during pickling is preferably between 50 and 80 ° C, more preferably 65 and 70 ° C.
- Many pickling solutions absorb water during use, which can reduce the pickling effect. This is especially true for concentrated sulfuric acid or highly concentrated alkyl sulfonic acid which are hygroscopic. But there are also cases where water is removed, for example by evaporation.
- the water absorption and Abgabäbe can z. B. be followed by a density determination.
- the density of the pickling solution is measured after preparation and regularly during use. If the density of the pickling solution used drops, water can be removed, for example by heating, heating under vacuum or blowing dry gas, eg air. Dry gas has a relative humidity ⁇ 5% (measured at 20 ° C).
- the blowing of the dry gas can be used at the same time for mixing the pickling solution. If the density increases, water can be added. Already deviations in the density of 0.05 kg / 1 or more, preferably already more than 0.03 kg / 1 (both in terms of an increase and a decrease in density) can be taken as an opportunity to increase the density by removing or adding Adjust water.
- the invention also provides a method comprising the steps:
- the density of the pickling solution is in the range of 1.55 to 1.59 g / cm 3 .
- the invention also provides the use of the pickling solution for pickling plastics.
- Another object of the invention is a process for coating plastics, comprising the steps
- one or more metal layers can then be deposited on the plastic.
- the pickling solution is additionally filtered.
- the invention also provides a process for pickling plastics comprising the steps
- At least part of a plastic object is immersed in the pickling solution provided. While the plastic is immersed in the pickling solution, the pickling solution is filtered. In one embodiment, the filtration removes unwanted manganese compounds. Particularly preferred in this case is the removal of manganese (IV) compounds, in particular Mn0 2 .
- the pickling solution is pumped by means of a pump in a circuit, wherein the pump is in particular selected from the group consisting of submersible pumps, diaphragm pumps and centrifugal pumps.
- the filtration is carried out independently of application of voltage to the pickling solution.
- the filtration is carried out continuously, particularly preferred is the method in which the filtration is carried out both before the immersion of the plastic in the pickling solution and after removal of the plastic from the pickling solution.
- a filter medium is a component that is permeable to liquid or gaseous substances, while it does not let solid substances from a defined size pass.
- the filter medium is preferably based on organic material, preferably organic polymers, more preferably polyolefins, most preferably on polypropylene, polyethylene, blends or copolymers thereof.
- the filter medium has a filter fineness of 5 ⁇ or less, preferably 2 ⁇ or less, more preferably 1 ⁇ or less. It is most preferred if the filter medium has a filter fineness of 0.1 to 1 ⁇ .
- filter fineness corresponds to the diameter of the largest spherical ball that can barely pass the filter.
- the flow rate of the pickling solution through the filter medium is 0.2 to 5 l / s, preferably 0.4 to 5 l / s, more preferably 0.5 to 5 l / s. Also according to the invention is the use of the filtration system according to the invention for carrying out the method according to the invention.
- the invention furthermore relates to a coated plastic obtainable by the process according to the invention. All cited documents are fully incorporated in the disclosure, as far as this disclosure is not inconsistent with the teachings of the invention.
- FIG. 1 shows a SEM image 5000 times according to example 3.
- FIG. 2 shows a diagram of the peeling force measurement ABS according to example 3.
- FIG. 3 shows an SEM recording 5000-fold according to example 4.
- FIG. 4 shows a diagram of the peeling force measurement according to Example 4.
- FIG. 5 shows a coated ABS plate according to example 5.
- FIG. 6 shows a SEM image 5000 times according to example 5.
- FIG. 7 shows a diagram of the peeling force measurement ABS according to example 5.
- FIG. 8 shows a SEM recording 5000-fold according to example 6.
- FIG. 9 shows a diagram of the peeling force measurement according to example 6.
- FIG. 10 shows a SEM image 5000 times according to Example 7.
- FIG. 11 shows a SEM image 5000 times according to example 8.
- FIG. 12 shows a SEM image 5000 times according to example 9.
- FIG. 13 shows a SEM recording 5000 times according to example 10.
- FIG. 14 shows the influence of the density on the pickling effect of a sample solution.
- Example 1 fVeraleichsbeispieH
- Example 2 (Comparative Example)
- the solution is then heated to 70 ° C.
- the solution can be agitated by vigorous stirring by magnetic stirrer or by blowing in air.
- An ABS plastic plate with the dimensions 100x100x2 mm is pickled in this solution for 10 min.
- An SEM image is shown in FIG. After further galvanic coating, a completely closed surface appears.
- a low adhesion value of 2 N / cm is measured in comparison to chromic acid-containing solutions, see FIG. 2.
- the solution is then heated to 70 ° C.
- the solution can be agitated by vigorous stirring by magnetic stirrer or by blowing in air.
- An ABS plastic plate with the dimensions 100x100x2 mm is pickled in this solution for 10 min.
- a study of the pickling structure by means of SEM at 5000 ⁇ magnification shows a slightly over-stained plastic surface (see FIG. 3).
- a subsequent peel force measurement according to DIN 53494 at 6 N / cm is used to measure a comparable adhesion value in comparison with chromic acid-containing solutions (see FIG 4).
- Conventional (chromic acid) treated ABS sheets have adhesion values up to 10 N / cm.
- the solution is then heated to 70 ° C.
- the solution can be agitated by vigorous stirring by magnetic stirrer or by blowing in air.
- the solution is electrolyzed and moved mechanically.
- a corresponding electrolysis device is used, are separated in the anode and cathode compartment by a ceramic diaphragm.
- the produced mixture which shows a color change from clear to purple by anodic oxidation. This purple discoloration indicates the formation of permanganate ions.
- a concentration of permanganate 350 mg / l permanganate were determined.
- the solution is then heated to 70 ° C.
- the solution can be agitated by vigorous stirring by magnetic stirrer or by blowing in air.
- This solution is electrolyzed as in Example 5 until a manganese (VII) content of 350 mg / l is achieved.
- the pickling image of the sample has an insufficient, weak pickling attack. After 5 days rest of the solution shows a drop in manganese content of more than 1 g / l. The solution has a brownish sediment.
- the pickling pattern of the sample shows a uniform, moderately pronounced pickling attack. After 5 days rest of the solution shows a drop in manganese content of less than 1 g / l. The solution has a visible brownish sediment.
- a solution is prepared with the following composition: Per liter - 6 g / l of manganese in the form of manganese sulfate
- the pickling pattern of the sample shows a good and uniform pickling attack. After 5 days rest of the solution shows a drop in manganese content of less than 1 g / l. The solution has a visible brownish sediment.
- a pickling solution according to Example 9 is heated to 70 ° C.
- the pickling solution is continuously moved by means of air injection.
- the color of the pickling solution is initially violet clear.
- plastic components are pickled and prepared for treatment in the further coating process.
- the solution is regularly monitored analytically, the total manganese concentration is determined.
- a first sign of an instability of the solution is a change from violet clear to brownish cloudy Decrease in the total content of dissolved manganese compounds results. It comes to a formation of finest manganese (IV) compounds (brownstone), which accumulate more and more and contribute to the increased sludge formation.
- the Mn (IV) compounds are also deposited on the plastic components in the pickling solution.
- a pickling solution according to Example 9 is circulated by means of a pump made of PVDF (polyvinylidene fluoride), in whose pumping circuit a filter element with a filter fineness of 1 ⁇ m is interposed.
- the other conditions correspond to Example 13.
- the filtration of the pickling solution leads to the removal of very fine manganese (IV) compounds and particles, so that their catalytic effect on the increasing conversion of the dissolved Mn (VII) compounds to Mn (IV) compounds is prevented .
- the manganese content has dropped to only 5.9 g / l.
- This difference can be supplemented by adding an aqueous manganese (II) solution.
- the solution remains stable and shows a good pickling effect when introducing the plastic components to be treated. There is no sludge formation in the pickling tank. Even after another week, the solution shows a stable behavior.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16205758 | 2016-12-21 | ||
EP16205765 | 2016-12-21 | ||
PCT/EP2017/084196 WO2018115338A1 (de) | 2016-12-21 | 2017-12-21 | Beizlösung zum beizen von kunststoffen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3559320A1 true EP3559320A1 (de) | 2019-10-30 |
Family
ID=60935849
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17825528.7A Withdrawn EP3559320A1 (de) | 2016-12-21 | 2017-12-21 | Beizlösung zum beizen von kunststoffen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3559320A1 (de) |
CN (1) | CN110402304A (de) |
MX (1) | MX2019007128A (de) |
WO (1) | WO2018115338A1 (de) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1283031C (en) * | 1986-07-01 | 1991-04-16 | Digital Equipment Corporation | On-line filtration of potassium permanganate solutions |
JP2513728B2 (ja) * | 1987-10-09 | 1996-07-03 | ポリプラスチックス株式会社 | 液晶性ポリエステル樹脂成形品の表面処理法 |
BR9915280A (pt) * | 1998-11-13 | 2001-08-07 | Enthone Omi Inc | Processo para metalizar uma superfìcie plástica |
FR2823214B1 (fr) * | 2001-04-09 | 2007-05-11 | Jean Claude Portner | Pre-traitement des matieres plastiques |
MY142204A (en) * | 2002-07-25 | 2010-10-29 | Pharmacia Corp | Pramipexole once-daily dosage form |
WO2007040245A1 (ja) * | 2005-10-04 | 2007-04-12 | Taisei Plas Co., Ltd. | 金属と樹脂の複合体及びその製造方法 |
PL2025708T3 (pl) * | 2007-08-10 | 2010-03-31 | Enthone | Roztwór trawiący do powierzchni tworzyw sztucznych nie zawierający chromu |
DE102011111294B4 (de) * | 2011-08-26 | 2018-12-20 | Atotech Deutschland Gmbh | Verfahren zur Behandlung von Kunststoffsubstraten und Vorrichtung zur Regeneration einer Behandlungslösung |
LT6070B (lt) * | 2012-12-07 | 2014-09-25 | Atotech Deutschland Gmbh | Plastikų paviršiaus paruošimo prieš jų cheminį metalizavimą būdas |
-
2017
- 2017-12-21 MX MX2019007128A patent/MX2019007128A/es unknown
- 2017-12-21 WO PCT/EP2017/084196 patent/WO2018115338A1/de unknown
- 2017-12-21 EP EP17825528.7A patent/EP3559320A1/de not_active Withdrawn
- 2017-12-21 CN CN201780079690.6A patent/CN110402304A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
MX2019007128A (es) | 2019-09-19 |
WO2018115338A1 (de) | 2018-06-28 |
CN110402304A (zh) | 2019-11-01 |
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