CN109137049B - Production process of easy-electrode electrophoresis aluminum profile subjected to passivation pretreatment - Google Patents

Production process of easy-electrode electrophoresis aluminum profile subjected to passivation pretreatment Download PDF

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Publication number
CN109137049B
CN109137049B CN201811039225.2A CN201811039225A CN109137049B CN 109137049 B CN109137049 B CN 109137049B CN 201811039225 A CN201811039225 A CN 201811039225A CN 109137049 B CN109137049 B CN 109137049B
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China
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tank
section bar
passivation
electrophoresis
acid
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CN109137049A (en
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涂利
湛超群
何长春
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Guangdong Yaoyinshan Aluminium Co ltd
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Guangdong Yaoyinshan Aluminium Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/20—Pretreatment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
    • C09D5/4407—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with polymers obtained by polymerisation reactions involving only carbon-to-carbon unsaturated bonds
    • C09D5/4411—Homopolymers or copolymers of acrylates or methacrylates
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/56—Treatment of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/04—Electrophoretic coating characterised by the process with organic material

Abstract

The invention discloses a production process of an easily-polarized electrophoretic aluminum profile subjected to passivation pretreatment, which comprises the following steps of: hanging the section on a rack, carrying out degreasing and deoiling treatment on the section, pickling, carrying out three-way pure water serial cleaning, passivating, carrying out main tank electrophoresis, dripping and drying. The electrophoresis production process provided by the invention can replace a chromate treatment process which is forbidden to be used gradually, and is applicable to various aluminum alloy section bar manufacturers, and the prepared chromium-free passivation film layer is compact in colloid, excellent in corrosion resistance, good in adhesion with a section bar base layer and an electrophoresis paint film and uniform in film thickness; meanwhile, through adjusting the electrophoretic paint of the electrophoretic bath and the operation method, two high-energy-consumption processes of anodic oxidation and coloring are omitted, so that the energy is saved, the environment is protected, the discharge of waste water is reduced, the production time is greatly shortened, the processed sectional material has stable quality, the surface film layer has high corrosion resistance, long weather resistance, multiple surface colors and high selectivity of home decoration materials.

Description

Production process of easy-electrode electrophoresis aluminum profile subjected to passivation pretreatment
Technical Field
The invention relates to the technical field of surface treatment of aluminum profiles, in particular to a production process of an easily-polarized electrophoretic aluminum profile subjected to passivation pretreatment.
Background
With the vigorous development of national economy, at present, China is a country with large consumption of aluminum materials. Aluminum profiles are usually pretreated by a chromate chemical passivation method before electrophoretic coating, but hexavalent chromium ions in chromate treatment have carcinogenic effect on human bodies, and improper treatment can cause serious pollution to the environment, so the chromate passivation process is concerned greatly, and some countries limit the use of the chromate passivation process. In recent years, a great deal of research is carried out on the chromium-free passivation process at home and abroad, and various passivation solution treatment systems such as rare earth, cobalt salt, silicate, molybdic acid, titanium/zirconate and the like are developed, so that the corrosion-resistant performance is certain. However, the passivation effect still has the defects of insufficient uniformity of the passivation film, insufficient compactness, poor adhesion and unsatisfactory corrosion resistance, and needs to be improved.
The passivation operation belongs to the steps in pretreatment before electrophoretic coating, and the pretreated section bar generally needs to be subjected to main processes such as anodic oxidation, coloring, electrophoresis, drying and the like, so that with the continuous enhancement of environmental protection and energy saving awareness of people, on the premise of ensuring the product quality, some high-energy consumption processes in the preparation process of the aluminum alloy section bar are reduced, and the purpose of environmental protection and energy saving is achieved.
Disclosure of Invention
The invention aims to solve one of the defects of the prior art and provides a production process of an easily-polarized electrophoretic aluminum profile subjected to passivation pretreatment.
The invention provides a production process of an easily-polarized electrophoretic aluminum profile subjected to passivation pretreatment, which comprises the following steps:
(1) hanging material
Hanging the section on a rack, and washing the section with water;
(2) degreasing and deoiling
Degreasing and deoiling the washed section;
(3) acid pickling
Putting the section bar treated in the step (2) into an acid washing tank, and further removing oil stains and an oxidation film on the surface of the section bar;
(4) three-way pure water series cleaning
Washing the section bar treated in the step (3) by using three pure water in series;
wherein: the conductivity of the first pure water is less than 1500 us/cm;
the conductivity of the second pure water is less than or equal to 200 us/cm; the PH value is more than or equal to 4.5;
the conductivity of the third pure water is less than or equal to 80us/cm, and the PH is greater than or equal to 5.0;
(5) passivation of
Putting the section bar processed in the step (4) into a passivation tank for passivation treatment, so that a layer of colorless chemical conversion film with uniform film thickness is formed on the surface of the section bar;
the main component in the passivation tank is nano plating solution, and the nano plating solution consists of nano silicon crystal, fruit acid, acetic acid, ethanol, vitamin and cerium;
(6) main tank electrophoresis
Putting the section bar processed in the step (5) into an electrophoresis main tank, wherein electrophoresis paint is filled in the electrophoresis main tank, and the section bar is electrified, lacquered and colored after being completely immersed for 30-90 s;
the electrophoretic paint comprises the following raw materials: acrylic acid, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, glycerol monomethacrylate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane trimethacrylate and ethoxylated bisphenol a dimethacrylate;
(7) dripping dry
Washing the section bar treated in the step (6) with water and dripping the section bar, wherein the section bar has a certain gradient in a dripping area;
(8) drying by baking
And (3) drying the dripped dry section in a drying furnace, placing the dried section in a rack unloading area for cooling, and then unloading the rack to obtain the section.
Preferably, in the step (5), the concentration of the nano plating solution in the passivation tank solution is 1-2%, the total acid of the tank solution in the tank is less than or equal to 6, and the pH value is: 3.1-3.6, passivation time: 30-60s, aluminum ion concentration less than or equal to 1.5g/L, conductivity greater than or equal to 200, zirconium ion: 20-60 mg/L.
Preferably, in the step (6), the paint solid content in the electrophoresis tank is 6-8g/L, the toner is 1-3kg, the pH is 5.8-8.0, the amine value is 0.2-0.4, the electrophoresis temperature is 20-30 ℃, the conductivity is 350-1000us/cm at 25 ℃, the time is 60-220s, and the voltage is 90-180V.
Preferably, the electrophoretic paint comprises the following components in percentage by weight: 2-4% of acrylic acid, 10-20% of methyl methacrylate, 20-30% of butyl acrylate, 6-10% of hydroxyethyl methacrylate, 6.5-12.5% of glycerol monomethacrylate, 3-7% of trimethylolpropane trimethacrylate, 5-9% of ethoxylated trimethylolpropane trimethacrylate and 2.5-6.5% of ethoxylated bisphenol A dimethacrylate.
Preferably, the electrophoretic paint also comprises a solvent for buffering the polymerization reaction, an amino resin, tert-butyl peroxybenzoate and chromium sulfate.
Preferably, the buffering solvent includes isopropyl alcohol and ethylene glycol ethyl ether.
Preferably, the isopropanol accounts for 1-3 wt%, the ethylene glycol ethyl ether accounts for 1-3 wt%, the amino resin accounts for 10-24 wt%, the tert-butyl peroxybenzoate accounts for 0.8-1.6 wt%, and the chromium sulfate accounts for 1.2-2.4 wt% of the electrophoretic paint.
Preferably, in the step (2), the degreasing and degreasing oil tank internal tank liquid composition is: free acid point: 15-70, aluminum ion concentration: less than 3.5g/L, bath temperature: 0-40 ℃, degreasing time: 2-5 min.
Preferably, in the step (3), the pickling bath internal bath solution comprises: free acid point: 20-70, aluminum ion: less than 3.5g/L, bath temperature: room temperature, acid washing time: 2.5-5 min.
Preferably, in the step (5), the content of zirconium ions in the chemical conversion coating formed on the surface of the shaped material is 1.0 to 5.0mg/m as measured by colorimetry2Measured according to a weight loss method, the concentration is 20-150mg/m2。
The invention has the beneficial effects that: according to the production process of the easy-electrode electrophoresis aluminum profile subjected to passivation pretreatment, the profile is passivated to form a dense colloid chromium-free passivation film layer, the passivation film layer has the advantages of excellent corrosion resistance, good adhesion with a profile base layer and an electrophoresis paint film, uniform film thickness, high production efficiency, small influence on the fatigue performance of the aluminum profile, energy conservation, less environmental pollution and the like, can replace a chromate treatment process which is forbidden gradually, and can be widely used for surface treatment of aluminum alloy profiles, aluminum plates, aluminum alloy castings and aluminum alloy products.
Meanwhile, by changing the processing technology of the electrophoresis process, adjusting the electrophoretic paint of the electrophoresis tank and the operation method, two high-energy consumption processes of anodic oxidation and coloring are omitted, so that the method is energy-saving and environment-friendly, reduces the discharge of waste water, greatly shortens the production time, and has the advantages of stable quality of the processed section, high corrosion resistance of a surface film layer, long weather resistance, multiple surface colors and high selectivity of home decoration materials.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Embodiment 1 a production process of an easy-pole electrophoretic aluminum profile subjected to passivation pretreatment, which comprises the following steps:
(1) hanging material
Hanging the section on a rack, and washing the section with water;
the material hanging is to hang the section to be processed on a shelf, check whether the model, the length and the count of the section are consistent according to a planned production scheduling list, determine that the section can be put on the shelf after no error, the sections with different colors are not allowed to be simultaneously loaded as much as possible, and the sections with the same color and different numbers are assembled together and need to be marked and strictly distinguished.
When feeding, the non-woven fabric gloves are needed to be worn for operation, and the hand-print and foot-print pedal section bars are forbidden. When the material is lifted, the material should be lightly taken and lightly placed, the sectional materials keep a certain distance and are uniformly distributed and separated, enough gaps are ensured between the sectional materials, the smooth circulation of tank liquor is ensured, and the passivation effect is ensured.
(2) Degreasing and deoiling
Degreasing and deoiling the washed section bar, wherein the degreasing and deoiling treatment is to remove oil stains and oxidation films on the surface of the section bar and ensure that the surface of the section bar is clean when the section bar enters a pickling tank;
wherein, the degreasing oil-removing tank comprises the following components: free acid point: 15-70, aluminum ion concentration: less than 3.5g/L, bath temperature: 0-40 ℃, degreasing time: 2-5 min;
for example, if the section bar is piled for a long time and has serious surface dust, the chain speed is properly slowed down according to the specific oil removing effect, the surface of the section bar after oil removing is required to be clean and bright, otherwise the passivation effect can be directly influenced;
free acid is analyzed by a laboratory technician once every 3-4 hours, aluminum ions are measured once every day, a technician needs to adjust according to an analysis result, oil stains on a liquid surface are cleaned irregularly, and whether to pour a tank or replace tank liquor is determined according to an oil removal effect, the surface brightness of the section bar, the cleanliness and the material passing amount. And pouring the bath solution once every month, and simultaneously pouring the bath solution once when the excess material amount is produced for about 1-2 months, namely about 2000T, and replacing the bath solution when the excess material amount is produced for about 4 months, namely about 5000T, according to the detection results of the aluminum points and the free acid.
(3) Acid pickling
Putting the section bar treated in the step (2) into a pickling tank, further removing oil stains and oxidation films on the surface of the section bar, increasing the surface cleanliness and brightness of the section bar, and accelerating the film coating speed on a passivation film;
wherein, the pickling tank internal tank liquid comprises the following components: free acid point: 20-70, aluminum ion: less than 3.5g/L, bath temperature: room temperature, acid washing time: 2.5-5 min; wherein the room temperature is: 20-30 ℃.
Free acid is analyzed once every 3-4 hours, aluminum ions are measured once every day, a technician needs to adjust according to an analysis result, oil stains on a liquid surface are cleaned irregularly, and whether to pour a tank or replace tank liquor is determined according to an oil removal effect, the surface brightness of the section, the cleanness and the material passing amount. And pouring the bath solution once every month, and simultaneously pouring the bath solution once when the excess material amount is produced for about 1-2 months, namely about 2000T, and replacing the bath solution when the excess material amount is produced for about 4 months, namely about 5000T, according to the detection results of the aluminum points and the free acid.
Technicians detect the etching degree of the sectional materials in the degreasing and oil removing groove and the pickling groove once per shift, and carry out the next three pure water serial cleaning steps when the etching amount is required to be more than or equal to 0.50 g/square meter; and when the etching amount is less than 0.50 g/square meter, adding the oil removal agent and the pickling agent in time, wherein the technicians need to add the oil removal agent and the pickling agent for 8 hours.
In the invention, degreasing and pickling steps can fully remove oil stains and oxidation films on the surface of the section bar, increase the cleanness and brightness of the surface of the section bar and accelerate the film coating speed on the passivation film.
(4) Three-way pure water series cleaning
Washing the section bar treated in the step (3) by using three pure water in series;
wherein: the conductivity of the first pure water is less than 1500us/cm, and the pure water is washed for 1-2 min;
the second pure water has the conductivity of less than or equal to 200us/cm and the PH of more than or equal to 4.5, and is washed by pure water for 1-2 min;
and the third pure water has the conductivity of less than or equal to 80us/cm and the pH of more than or equal to 5.0, and is washed with pure water for 1-3 min.
And analyzing whether the PH and the conductivity of the secondary pure water are qualified or not every time, and if the parameters of the pure water are unqualified, replacing the pure water with qualified PH and conductivity.
(5) Passivation of
Putting the section bar processed in the step (4) into a passivation tank for passivation treatment, so that a layer of colorless chemical conversion film with uniform film thickness is formed on the surface of the section bar;
the main component in the passivation tank is nano plating solution, the nano plating solution is composed of nano silicon crystal, fruit acid, acetic acid, ethanol, vitamin and cerium, the nano plating solution comprises 20-35% of nano crystal silicon, 10-15% of fruit acid, 10-15% of acetic acid, 15-20% of ethanol, 5-15% of vitamin and 3-9% of cerium according to weight percentage, the vitamin comprises vitamin A, vitamin B and vitamin C, and the cerium is nano cerium oxide.
The concentration of the nano plating solution in the bath solution is 1-2%, the total acid of the bath solution in the bath is less than or equal to 6, and the pH value is as follows: 3.1-3.6, treatment time: 30-60s, aluminum ion concentration less than or equal to 1.5g/L, conductivity greater than or equal to 200, zirconium ion: 20-60mg/L, treatment temperature: room temperature, wherein the room temperature is: 20-30 ℃.
Wherein the content of zirconium ions in the chemical conversion coating formed on the surface of the section bar is 1.0-5.0mg/m when measured by a colorimetric method2Measured according to a weight loss method, the concentration is 20-150mg/m2；
The passivation tank solution is filtered regularly, and each time, 100 tons of the passivation tank solution are filtered; the bath PH and conductivity were analyzed every three hours, the bath aluminum ion concentration and total acid were measured once a week, and the bath had to be filtered periodically. And (4) determining whether to invert the tank or replace tank liquor according to the membrane effect on the surface of the section bar, the detected membrane weight and the excess material amount. And adjusting according to the analysis result, and changing the bath solution when the excess material amount is produced for about 1-2 months, namely about 2000T is poured for one time, and the excess material amount is produced for about 4 months, namely about 5000T.
(6) Main tank electrophoresis
Slowly placing the section bar treated in the step (5) into an electrophoresis main tank, wherein electrophoresis paint is arranged in the electrophoresis tank, the section bar is electrified and painted after being completely immersed for 30-90s, and the section bar is colored, the solid content of the paint in the electrophoresis tank is 6-8g/L, the toner is 1-3kg, the pH value is 5.8-8.0, the amine value is 0.2-0.4, the electrophoresis temperature is 20-30 ℃, the conductivity is 350-1000us/cm at 25 ℃, the time is 60-220s, and the voltage is 90-180 v;
wherein, each component of the electrophoretic paint comprises: AA: acrylic acid, MMA: methyl methacrylate, BA: butyl acrylate, HEMA: hydroxyethyl methacrylate, GMMA: glycerol monomethacrylate, TMPTMA: trimethylolpropane trimethacrylate, TMP (3EO) TMA: ethoxylated trimethylolpropane trimethacrylate and E30 BADMA: ethoxylated bisphenol a dimethacrylate;
the electrophoretic paint comprises the following components in percentage by weight: AA 2-4%, MMA 10-20%, BA 20-30%, HEMA 6-10%, GMMA 6.5-12.5%, TMPTMA 3-7%, TMP (3EO) TMA 5-9% and E30BADMA2.5-6.5%;
the electrophoretic paint also comprises a solvent for buffering polymerization reaction, amino resin, TBPB: tert-butyl peroxybenzoate and BCS: chromium sulfate;
the solvent for buffering is IPA: isopropanol and ECS: ethylene glycol ethyl ether;
the electrophoretic paint comprises, by weight, IPA 1-3%, ECS 1-3%, amino resin 10-24%, TBPB 0.8-1.6% and BCS 1.2-2.4%;
specifically, the preparation method of the electrophoretic paint comprises the following steps: AA, MMA, BA, HEMA, GMMA, TMPTMA, TMP (3EO) TMA, E30BADMA, TBPB and BCS are added into a proper amount of solvent for polymerization buffer according to the corresponding proportion: after IPA and ECS are polymerized for 8-16h, DMAE is added when the temperature is cooled to 50-80 ℃: and (3) performing saponification reaction on the dimethyl aminoethanol to obtain water-soluble solution, adding an amino resin cross-linking agent, adding a solvent to adjust the viscosity and the solid content, and fully stirring for 2-6h to obtain the electrophoretic paint, wherein the solvent used for adjusting the viscosity and the solid content is the solvent for the polymerization reaction buffer.
(7) Dripping dry
Washing the section bar treated in the step (6) with water and dripping the section bar, wherein the section bar has a certain gradient in a dripping area;
(8) drying by baking
And (3) drying the dripped dry section in a drying furnace, placing the dried section in a rack unloading area for cooling, and then unloading the rack to obtain the section, wherein the drying temperature is 80-100 ℃, and the drying time is 20-30 min.
In the passivation operation of the section bar, the environment-friendly passivation solution without toxic and harmful substances is used for replacing the passivation solution for chromizing and phosphorizing, the section bar can be treated at room temperature, and a uniform and compact film layer is formed on the surface of a workpiece.
Meanwhile, in the electrophoresis step, the electrophoretic paint in the electrophoresis tank is prepared by reasonably and mutually matching traditional acrylic monomers and a plurality of multifunctional high-performance acrylic monomers to form a multi-network structure when a paint film on the surface of the section is crosslinked, and the water-soluble electrophoretic paint with high hardness, high gloss, high adhesive force and excellent chemical resistance has prominent performances, so that the aluminum product workpiece still can have the same or better adhesive force and weather resistance without the steps of oxidation and coloring with high pollution and high energy consumption in the traditional production process, the operation purpose of energy conservation and environmental protection is fully embodied, considerable cost is saved for enterprises, and a better working environment is provided for operators.
Example 2
On the basis of embodiment 1, this embodiment 2 proposes a process for producing an easy-polarity electrophoretic aluminum profile by passivation pretreatment, wherein in the step (2), the components of the liquid in the degreasing and oil-removing tank are as follows: free acid point: 43, aluminum ion concentration: less than 3.5g/L, bath temperature: 25 ℃, degreasing time: 3.5 min;
in the step (3), the pickling tank internal tank liquid comprises: free acid point: 45, aluminum ion: less than 3.5g/L, bath temperature: acid washing time at 25 ℃: 4 min;
in the step (4), the first pure water washing is carried out for 1.5min, the second pure water washing is carried out for 1.5min, and the third pure water washing is carried out for 2 min;
in the step (5), the concentration of the nano plating solution in the passivation bath solution is 1.5%, the total acid of the bath solution is less than or equal to 6, and the pH value is as follows: 3.4, treatment time: 45s, aluminum ion concentration less than or equal to 1.5g/L, conductivity greater than or equal to 200, zirconium ion: 40mg/L, treatment temperature: 25 ℃;
the content of zirconium ions in the chemical conversion film formed on the surface of the section is 3.0mg/m when measured by a colorimetric method2Measured by a weight loss method, is 85mg/m2。
In the step (6), the section is electrified and painted after being completely immersed for 60s, and is colored, the solid content of the paint in the electrophoresis tank is 6g/L, the toner is 1kg, the PH is 5.8, the amine value is 0.2, the electrophoresis temperature is 20-30 ℃, the conductivity is 350-600us/cm, the time is 220s, and the voltage is 90 v;
wherein the electrophoretic paint comprises the following components in percentage by weight: AA 3%, MMA 15%, BA 25%, HEMA 8%, GMMA 9.5%, TMPTMA 5%, TMP (3EO) TMA 7%, E30BADMA4.5%, IPA 1.5%, ECS 1.5%, amino resin 17%, TBPB 1.2% and BCS 1.8%;
specifically, the preparation method of the electrophoretic paint comprises the following steps: AA, MMA, BA, HEMA, GMMA, TMPTMA, TMP (3EO) TMA, E30BADMA, TBPB and BCS are added into a proper amount of solvent for polymerization buffer according to the corresponding proportion: after 12h of polymerization in IPA and ECS, DMAE: and (3) performing saponification reaction on the dimethyl aminoethanol to obtain water-soluble solution, adding an amino resin cross-linking agent, adding a solvent to adjust the viscosity and the solid content, and fully stirring for 4 hours to obtain the electrophoretic paint, wherein the solvent used for adjusting the viscosity and the solid content is the solvent for buffering the polymerization reaction.
And (5) in the step (8), the drying temperature is 90 ℃, and the drying temperature is 25min, so that the section bar is obtained.
Example 3
On the basis of embodiment 1, this embodiment 3 proposes a process for producing an easy-polarity electrophoretic aluminum profile by passivation pretreatment, wherein in the step (2), the degreasing and oil-removing tank internal liquid comprises: free acid point: 70, aluminum ion concentration: less than 3.5g/L, bath temperature: 1 ℃, degreasing time: 5 min;
in the step (3), the pickling tank internal tank liquid comprises: free acid point: 70, aluminum ion: less than 3.5g/L, bath temperature: acid washing time at 20 ℃: 5 min;
in the step (4), the first pure water washing is carried out for 2min, the second pure water washing is carried out for 2min, and the third pure water washing is carried out for 3 min;
in the step (5), the concentration of the nano plating solution in the passivation bath solution is 2%, the total acid of the bath solution is less than or equal to 6, and the pH value is as follows: 3.1, treatment time: 30s, aluminum ion concentration less than or equal to 1.5g/L, conductivity greater than or equal to 200, zirconium ion: 60mg/L, treatment temperature: 20 ℃;
the content of zirconium ions in the chemical conversion film formed on the surface of the section is 5.0mg/m when measured by a colorimetric method2150mg/m as determined by weight loss method2。
In the step (6), the section bar is electrified and painted after being completely immersed for 30s, and is colored, the solid content of the paint in the electrophoresis tank is 7g/L, the toner is 2kg, the PH is 7.0, the amine value is 0.3, the electrophoresis temperature is 20-30 ℃, the conductivity is 600-800us/cm, the time is 140s, and the voltage is 140v, wherein the composition, the proportion and the preparation method of the raw materials of the electrophoresis paint in the embodiment 3 are the same as those of the embodiment 2.
In the step (8), the drying temperature is 100 ℃, and the drying temperature is 30min, so that the section bar is obtained.
Example 4
On the basis of embodiment 1, this embodiment 4 proposes a process for producing an easy-polarity electrophoretic aluminum profile by passivation pretreatment, wherein in the step (2), the components of the liquid in the degreasing and oil-removing tank are as follows: free acid point: 15, aluminum ion concentration: less than 3.5g/L, bath temperature: 40 ℃, degreasing time: 2 min;
in the step (3), the pickling tank internal tank liquid comprises: free acid point: 20, aluminum ion: less than 3.5g/L, bath temperature: acid washing time at 30 ℃: 2.5 min;
in the step (4), the first pure water washing is carried out for 1min, the second pure water washing is carried out for 1min, and the third pure water washing is carried out for 1 min;
in the step (5), the concentration of the nano plating solution in the passivation bath solution is 1%, the total acid of the bath solution is less than or equal to 6, and the pH value is as follows: 3.6, treatment time: 60s, aluminum ion concentration less than or equal to 1.5g/L, conductivity greater than or equal to 200, zirconium ion: 20mg/L, treatment temperature: 30 ℃;
the content of zirconium ions in the chemical conversion film formed on the surface of the section is 1.0mg/m when measured by a colorimetric method2Measured by a weight loss method, is 20mg/m2。
In the step (6), the section bar is electrified and painted after being completely immersed for 90 seconds, and is colored, the solid content of the paint in the electrophoresis tank is 8g/L, the toner is 2kg, the pH value is 8.0, the amine value is 0.4, the electrophoresis temperature is 20-30 ℃, the conductivity is 800-1000us/cm, the time is 60 seconds, and the voltage is 180v, wherein the composition, the proportion and the preparation method of the raw materials of the electrophoresis paint in the embodiment 4 are the same as those of the embodiment 2.
And (5) in the step (8), the drying temperature is 80 ℃, and the drying temperature is 20min, so that the section bar is obtained.
Comparative example
The main component of the passivation bath solution, nano-plating solution, was replaced with chromate in the same amount as in example 2, and other parameters and treatment steps were the same as in example 2.
The performance tests of the profiles obtained by comparing the examples 2-4 of the present invention with the comparative examples are shown in the following table one:
watch 1
Figure BDA0001791696530000111
As can be seen from the table I, the adhesive force and the corrosion resistance of the section bars obtained by the treatment of the examples 2 to 4 are better than those of the section bars obtained by the treatment of the comparative example, and the section bars have more excellent water resistance; from the test results of the examples 2 to 4, the sectional materials obtained by the production process provided by the invention have strong adhesive force, corrosion resistance and water resistance, the hardness of the paint film formed on the surface also reaches more than 3H, and the paint film has uniform, bright and colorful colors. Among them, example 2 is a preferred example in the present invention.
In conclusion, under the passivation treatment of the passivation process parameters provided by the invention, the colorless passivation film is formed on the surface of the section bar, the colloid of the passivation film is compact, the film thickness is uniform, the passivation film has excellent corrosion resistance, and the passivation film can have good adhesive force with the base layer of the section bar and the electrophoretic paint film; meanwhile, by adjusting the electrophoretic paint of the electrophoresis tank and the operation method, two high-energy consumption processes of anodic oxidation and coloring are omitted, energy consumption and cost are saved, the discharge of waste water is reduced, the processed section bar has stable quality, the corrosion resistance of a surface film layer is high, the weather resistance is long, the surface color is multiple, and the selectivity of home decoration materials is high.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. If various changes or modifications to the present invention are made without departing from the spirit and scope of the present invention, it is intended that the present invention encompass such changes and modifications as fall within the scope of the claims and the equivalent technology of the present invention.

Claims (1)

1. The production process of the easy-electrode electrophoresis aluminum profile subjected to passivation pretreatment is characterized by comprising the following steps of:
(1) hanging material
Hanging the section on a rack, and washing the section with water;
(2) degreasing and deoiling
Degreasing and deoiling the washed section bar, wherein the degreasing and deoiling treatment is to remove oil stains and oxidation films on the surface of the section bar and ensure that the surface of the section bar is clean when the section bar enters a pickling tank;
wherein, the degreasing oil-removing tank comprises the following components: free acid point: 15-70, aluminum ion concentration: less than 3.5g/L, bath temperature: 0-40 ℃, degreasing time: 2-5 min;
analyzing the free acid once by a laboratory technician every 3-4 hours, measuring aluminum ions once every day, adjusting by a technician according to an analysis result, irregularly cleaning oil stains on a liquid surface, and determining whether to pour a tank or replace tank liquor according to an oil removal effect, the surface brightness of the section bar, the cleanliness and the material passing amount; pouring the bath at least once every month, pouring the bath solution once when the excess amount of the produced bath solution is 1-2 months (2000T) and replacing the bath solution when the excess amount of the produced bath solution is 4 months (5000T) according to the detection results of the aluminum dots and the free acid;
(3) acid pickling
Putting the section bar treated in the step (2) into an acid washing tank, and further removing oil stains and an oxidation film on the surface of the section bar; and the pickling tank internal tank liquid comprises the following components: free acid point: 20-70, aluminum ion: less than 3.5g/L, bath temperature: room temperature, acid washing time: 2.5-5 min; analyzing the free acid once every 3-4 hours, measuring aluminum ions once every day, adjusting by a technician according to an analysis result, irregularly cleaning oil stains on a liquid level, and determining whether to pour the tank or replace the tank liquid according to an oil removal effect, the surface brightness of the section bar, the cleanness and the excess material amount; pouring the tank at least once every month, pouring the tank liquor once every month when the excess material amount is 1-2 months (2000T), and replacing the tank liquor when the excess material amount is 4 months (5000T) according to the detection results of the aluminum points and the free acid; (4) three-way pure water series cleaning
Washing the section bar treated in the step (3) by using three pure water in series;
wherein: the conductivity of the first pure water is less than 1500 us/cm;
the conductivity of the second pure water is less than or equal to 200 us/cm; a pH of greater than or equal to 4.5;
the conductivity of the third pure water is less than or equal to 80us/cm, and the PH is greater than or equal to 5.0;
analyzing whether the PH and the conductivity of the secondary pure water are qualified or not every time, and if the parameters of the pure water are unqualified, replacing the pure water with qualified PH and conductivity;
(5) passivation of
Putting the section bar treated in the step (4) into a passivation tank for passivation treatment, so that a layer of colorless chemical conversion coating with uniform film thickness is formed on the surface of the section bar, and the content of zirconium ions in the chemical conversion coating formed on the surface of the section bar is 1.0-5.0mg/m when measured by a colorimetric method2Measured according to a weight loss method, the concentration is 20-150mg/m2；
The main component in the passivation tank is nano plating solution, the nano plating solution is composed of nano silicon crystal, fruit acid, acetic acid, ethanol, vitamin and cerium, the nano plating solution comprises 20-35% of nano crystal silicon, 10-15% of fruit acid, 10-15% of acetic acid, 15-20% of ethanol, 5-15% of vitamin and 3-9% of cerium according to weight percentage, the vitamin comprises vitamin A, vitamin B and vitamin C, and the cerium is nano cerium oxide; and the concentration of the nano plating solution in the passivation tank is 1-2%, the total acid of the tank liquid in the tank is less than or equal to 6, the PH is 3.1-3.6, the passivation time is 30-60s, the concentration of aluminum ions is less than or equal to 1.5g/L, the conductivity is greater than or equal to 200, and the ratio of zirconium ions: 20-60 mg/L;
(6) main tank electrophoresis
Putting the section bar processed in the step (5) into an electrophoresis main tank, wherein electrophoresis paint is filled in the electrophoresis main tank, and the section bar is electrified, lacquered and colored after being completely immersed for 30-90 s;
the electrophoretic paint comprises the following raw materials: acrylic acid, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, glycerol monomethacrylate, trimethylolpropane trimethacrylate, ethoxylated bisphenol A dimethacrylate, a solvent for polymerization buffer, an amino resin, t-butyl peroxybenzoate and chromium sulfate; the solid content of the paint in the electrophoresis tank is 6-8g/L, the toner is 1-3kg, the pH is 5.8-8.0, the amine value is 0.2-0.4, the electrophoresis temperature is 20-30 ℃, the conductivity is 350-1000us/cm at 25 ℃, the time is 60-220s, and the voltage is 90-180V; the electrophoretic paint comprises the following components in percentage by weight: 2-4% of acrylic acid, 10-20% of methyl methacrylate, 20-30% of butyl acrylate, 6-10% of hydroxyethyl methacrylate, 6.5-12.5% of glycerol monomethacrylate, 3-7% of trimethylolpropane trimethacrylate, 5-9% of ethoxylated trimethylolpropane trimethacrylate, 2.5-6.5% of ethoxylated bisphenol A dimethacrylate, 1-3% of isopropanol, 1-3% of ethylene glycol ethyl ether, 10-24% of amino resin, 0.8-1.6% of tert-butyl peroxybenzoate and 1.2-2.4% of chromium sulfate; the preparation method of the electrophoretic paint comprises the following steps: according to the corresponding proportion, acrylic acid, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, glycerol monomethacrylate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane trimethacrylate and ethoxylated bisphenol A dimethacrylate are subjected to polymerization reaction in a proper amount of polymerization reaction buffering solvent for 8-16h, then dimethylaminoethanol is added when the mixture is cooled to 50-80 ℃, an amino resin cross-linking agent is added after saponification reaction is water-soluble, then a solvent is added to adjust the viscosity and the solid content and fully stir for 2-6h to obtain the electrophoretic paint, the solvent used for adjusting the viscosity and the solid content is the polymerization reaction buffering solvent, and the polymerization reaction buffering solvent is isopropanol and ethylene glycol ethyl ether;
(7) dripping dry
Washing the section bar treated in the step (6) with water and dripping the section bar, wherein the section bar has a certain gradient in a dripping area;
(8) drying by baking
And (3) drying the dripped dry section in a drying furnace, placing the dried section in a rack unloading area for cooling, and then unloading the rack to obtain the section, wherein the drying temperature is 80-100 ℃, and the drying time is 20-30 min.
CN201811039225.2A 2018-09-06 2018-09-06 Production process of easy-electrode electrophoresis aluminum profile subjected to passivation pretreatment Expired - Fee Related CN109137049B (en)

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