CN111394735A - Aluminum profile spraying pretreatment liquid and spraying pretreatment method - Google Patents
Aluminum profile spraying pretreatment liquid and spraying pretreatment method Download PDFInfo
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- CN111394735A CN111394735A CN202010278171.6A CN202010278171A CN111394735A CN 111394735 A CN111394735 A CN 111394735A CN 202010278171 A CN202010278171 A CN 202010278171A CN 111394735 A CN111394735 A CN 111394735A
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- 239000007788 liquid Substances 0.000 title claims abstract description 47
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 45
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000005507 spraying Methods 0.000 title claims abstract description 28
- 238000002203 pretreatment Methods 0.000 title claims abstract description 8
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000005498 polishing Methods 0.000 claims abstract description 41
- 230000004048 modification Effects 0.000 claims abstract description 17
- 238000012986 modification Methods 0.000 claims abstract description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 15
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 14
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004094 surface-active agent Substances 0.000 claims abstract description 10
- 239000011241 protective layer Substances 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 41
- -1 polyoxyethylene Polymers 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 9
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 4
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 3
- 235000011187 glycerol Nutrition 0.000 claims description 3
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 235000013024 sodium fluoride Nutrition 0.000 claims description 3
- 239000011775 sodium fluoride Substances 0.000 claims description 3
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 claims description 3
- 229940039790 sodium oxalate Drugs 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 235000017550 sodium carbonate Nutrition 0.000 claims description 2
- 235000010288 sodium nitrite Nutrition 0.000 claims description 2
- 159000000000 sodium salts Chemical class 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 238000000034 method Methods 0.000 description 12
- 229910000838 Al alloy Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- LDDQLRUQCUTJBB-UHFFFAOYSA-O azanium;hydrofluoride Chemical compound [NH4+].F LDDQLRUQCUTJBB-UHFFFAOYSA-O 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005254 chromizing Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 239000013306 transparent fiber Substances 0.000 description 1
Images
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- 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
- C23C22/46—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 containing oxalates
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
- C23F3/02—Light metals
- C23F3/03—Light metals with acidic solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses a pretreatment liquid for spraying aluminum profiles and a pretreatment method for spraying, wherein the pretreatment liquid comprises an oil-removing polishing liquid and a modification liquid, the oil-removing polishing liquid comprises 5-30 g/L of oxalic acid, 0.5-4 g/L of ammonium bifluoride, 0.001-0.01 g/L of a surfactant and 0.05-0.5 g/L of an auxiliary agent, the modification liquid comprises 0.5-5 g/L of oxalic acid, 0.05-1.0 g/L of ammonium bifluoride and 0.5-5 g/l of modified acrylic resin, the pretreatment method for spraying the aluminum profiles comprises the steps of using the oil-removing polishing liquid to remove oil and polish the aluminum profiles to form a composite salt film protective layer, and forming a hydrophobic modification film on the composite salt film protective layer in the modification liquid.
Description
Technical Field
The invention relates to the technical field of aluminum alloy surface treatment, in particular to a spraying pretreatment technology for an aluminum profile.
Background
The aluminum alloy surface spraying process is a process for forming a coating with a certain thickness on the surface of the aluminum alloy by using an organic polymer material through a certain process method. The aluminum alloy spraying has three functions: 1. protection; 2. decoration function; 3. other functions are as follows: certain special functions such as insulation, conductivity and the like are obtained through the coating performance.
The pretreatment processes in the prior art are roughly divided into oil removal, alkali washing, acid washing, chromizing and chromium-free passivation (fluorozirconate, organic-inorganic composite and silane), a large amount of water washing is required between each process, and after the treatment solution is used for a period of time, the treatment solution needs to be replaced or updated partially after being discharged because aluminum ions in the treatment solution rise continuously or certain substances accumulate. The pretreatment process in the prior art is complex in whole production process, generates a large amount of waste water and solid waste in the production process, comprises a large amount of dangerous waste, has complex production process flow and high production control requirement, brings a large amount of pollutants to the environment, consumes a large amount of chemical raw materials and water, and washes out and discharges about 4Kg of Al per ton of pretreatment.
And the thickness of the process treatment film after pretreatment in the prior art is as follows: chromium film 1.1-3.8mg/dm2(ii) a No chromium: organic type 20-160mg/m2、(ii) a Inorganic type 5-20g/m2(ii) a 20 to 180mg/m of organic acid-titanium system2(ii) a 20 to 180mg/m of organo-zirconium-titanium system2(ii) a The thickness of the process film after pretreatment in the prior art is less than 200mg/m2(ii) a And has strong hydrophilicity, and is combined with a sprayed organic film in the subsequent spraying treatmentPoor in performance and low in adhesive force, and produces a large amount of waste water, solid waste and dangerous waste in the production process.
Disclosure of Invention
The first technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the pretreatment liquid for spraying the aluminum profile is used for pretreatment before spraying the aluminum profile, not only is the production cost low, and zero emission and pollution are realized, but also the treated modified membrane has hydrophobicity, and the binding force with a sprayed organic membrane is improved.
The second technical problem to be solved by the invention is: aiming at the defects in the prior art, the method for pretreating the aluminum profile before spraying is provided, the method is simple, the production cost is low, zero emission and zero pollution are realized, the treated modified membrane has hydrophobicity, and the binding force with the sprayed organic membrane is improved.
In order to solve the first technical problem, the technical scheme of the invention is as follows:
the aluminum profile spraying pretreatment liquid comprises an oil removing polishing liquid and a modifying liquid:
wherein the oil-removing polishing solution comprises 5-30 g/L of oxalic acid, 0.5-4 g/L of ammonium bifluoride, 0.001-0.01 g/L of surfactant and 0.05-0.5 g/L of assistant;
the modified liquid comprises 0.5-5 g/L g/l oxalic acid, 0.05-1.0 g/L g/l ammonium bifluoride and 0.5-5 g/l modified acrylic resin.
As a preferred technical scheme, the surfactant comprises one or more of alkylphenol polyoxyethylene, octylphenol polyoxyethylene, nonylphenol polyoxyethylene, glycerol fatty acid ester and sorbitan fatty acid ester; the auxiliary agent comprises sodium salt: one or more of sodium nitrite, sodium oxalate, sodium fluoride, sodium carbonate, sodium bicarbonate and sodium sulfate.
As an improved technical proposal, Al in the oil removing polishing solution and the modifying solution3+The equilibrium concentration is less than 1 g/L.
As an improved technical scheme, the modified acrylic resin is a stable aqueous solution with the pH value of 1-3.
The modified acrylic resin is preferably a modified acrylic resin with the model number of GS-58 and is produced by Changzhou Guangshu chemical technology limited, and a water-based acrylic aluminum profile chromium-free passivated resin.
Alternatively, the special chromium-free passivation resin for the water-based acrylic aluminum profile produced by Dow or Hangao in Germany is preferably used.
As an improved technical scheme, the oil removing polishing solution and the modifying solution are used in sequence of firstly removing the oil polishing solution and then modifying the oil polishing solution.
In the process of degreasing and polishing aluminum profiles, grease enters the treatment liquid, a transparent fiber with the specific gravity less than 1 and the thickness of about 30mm is generated under the combined action of oxalic acid, fluoride ions, an ammonia ion surfactant, an oxidation assistant and the like, the main component is polyamide, and the fiber tank liquid is regularly filtered out so that the fiber tank liquid cannot be updated and replaced due to the increase of the concentration of the grease. The foreign impurities are precipitated (with extremely small quantity) every year, and the foreign impurities are removed by inverting the tank. The invention has no pollution when no discharge exists, and the invention is different from the prior art in that the tank liquor does not need to be replaced and updated, and the flocculent fiber polymerized by grease can be removed by regular filtration, thereby ensuring the limpidity and sustainable reuse of the tank liquor and solving the problem of environmental protection.
In order to solve the second technical problem, the technical solution of the present invention is:
the spraying pretreatment method of the aluminum profile uses the pretreatment liquid and comprises the following steps:
(1) oil removal and polishing: placing the aluminum profile to be treated in an oil removal polishing solution, reacting until bubbles emerge from the treatment solution, then continuing to soak and react for 1-10 min, and covering a uniform composite salt film protective layer on the surface of the aluminum profile and the low-lying part of the aluminum profile;
(2) modifying the membrane: and dripping the degreased and polished aluminum profile into the modification solution, and soaking for 1-5 min to form a hydrophobic modification film on the composite salt film protection layer.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the aluminum profile spraying pretreatment liquid comprises an oil removing polishing liquid and a modification liquid, wherein the oil removing polishing liquid comprises 5-30 g/L of oxalic acid, 0.5-4 g/L of ammonium bifluoride, 0.001-0.01 g/L of a surfactant and 0.05-0.5 g/L of an auxiliary agent, the modification liquid comprises 0.5-5 g/L of oxalic acid, 0.05-1.0 g/L of ammonium bifluoride and 0.5-5 g/l of modified acrylic resin.
The invention finishes oil removal and polishing in one step, simplifies the steps, saves the washing step between each step in the prior art, directly modifies the oil removal and polishing by dripping dry, and directly sprays and solidifies the modified oil removal and polishing by drying, compared with the prior art, the waste water is reduced by 80 percent, the solid waste is reduced by 90 percent, no heavy metal is discharged, the pretreatment weight of the product is not reduced, and about 1 kilogram of the product is increased per ton of the section; the oil removing polishing solution and the modifying solution do not need to be replaced regularly, and only need to be increased according to consumption conditions, no wastewater is discharged, no hazardous waste is generated, chemical raw materials and water resources are saved, and the production cost is reduced.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a surface topography of a composite film formed by degreasing, polishing and modifying an aluminum profile according to the present invention.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The attached figure is a morphology diagram of a composite membrane formed by degreasing, polishing and modifying an aluminum profile, which is amplified by five thousand times.
Example 1
The aluminum profile spraying pretreatment liquid comprises an oil removing polishing liquid and a modifying liquid:
wherein the oil-removing polishing solution comprises the following components of 15 g/L g of oxalic acid, 2.5 g/L g of ammonium bifluoride, 0.005 g/L g of surfactant alkylphenol polyoxyethylene and 2.5 g/L g of auxiliary agent sodium oxalate;
the modified liquid comprises 3.0g/L g of oxalic acid, 0.5 g/L g of ammonium hydrogen fluoride and 4.5g/l of modified acrylic resin;
al in the oil removing polishing solution and the modifying solution3+The equilibrium concentration is 0.5 g/L, and the modified acrylic resin is a stable aqueous solution with the pH value of 2.5.
Example 2
The aluminum profile spraying pretreatment liquid comprises an oil removing polishing liquid and a modifying liquid:
wherein the oil-removing polishing solution comprises 11 g/L of oxalic acid, 1.8 g/L of ammonium bifluoride, 0.04 g/L of nonylphenol polyoxyethylene ether serving as a surfactant and 0.35 g/L of sodium fluoride serving as an auxiliary agent;
the modified liquid comprises 3.5 g/L g of oxalic acid, 0.8 g/L g of ammonium hydrogen fluoride and 3.0g/l of modified acrylic resin;
al in the oil removing polishing solution and the modifying solution3+The equilibrium concentration is 0.8 g/L, and the modified acrylic resin is a stable aqueous solution with the pH value of 2.3.
Example 3
The aluminum profile spraying pretreatment liquid comprises an oil removing polishing liquid and a modifying liquid:
wherein the oil-removing polishing solution comprises 24 g/L of oxalic acid, 3.4 g/L of ammonium bifluoride, 0.006 g/L of surfactant glycerin fatty acid ester and 0.33 g/L of auxiliary sodium carbonate;
the modified liquid comprises 4.5g/L g of oxalic acid, 0.8 g/L g of ammonium hydrogen fluoride and 4g/l of modified acrylic resin;
al in the oil removing polishing solution and the modifying solution3+The equilibrium concentration is 0.9 g/L, and the modified acrylic resin is a stable aqueous solution with the pH value of 2.1.
Example 4
The pretreatment liquid of embodiment 1 is used in a pretreatment method for spraying an aluminum profile, and comprises the following steps:
(1) oil removal and polishing: placing the aluminum profile to be treated in an oil removal polishing solution, reacting until bubbles emerge from the treatment solution, then continuing to soak and react for 2.5min, and covering a uniform composite salt film protective layer on the surface of the aluminum profile and the low-lying part of the aluminum profile;
(2) modifying the membrane: and dripping the degreased and polished aluminum profile into the modification solution, soaking for 2.5min, and forming a hydrophobic modification film on the composite salt film protection layer.
Example 5
The pretreatment liquid of the embodiment 2 is used in the pretreatment method for spraying the aluminum profile, and comprises the following steps:
(1) oil removal and polishing: placing the aluminum profile to be treated in an oil removal polishing solution, reacting until bubbles emerge from the treatment solution, then continuing to soak and react for 5.5min, and covering a uniform composite salt film protective layer on the surface of the aluminum profile and the low-lying part of the aluminum profile;
(2) modifying the membrane: and dripping the degreased and polished aluminum profile into the modification solution, soaking for 3.5min, and forming a hydrophobic modification film on the composite salt film protection layer.
Comparative example 1
Comparative example 1 is different from example 5 in that only degreasing polishing was performed to form a protective layer of a composite salt film without performing film modification in step (2).
The aluminum alloy sections modified in the examples 1 to 5 and the aluminum alloy section not subjected to film modification in the comparative example 1 are compared by a salt spray resistance test according to GB/T5237.4, after a soaking test for 48 hours, the aluminum alloy sections modified in the examples 1 to 5 have no defects such as foaming, delamination, wrinkling and the like, and the film adhesion is 0 grade and the impact resistance is qualified after being boiled in water for 2 hours at 0.1 MP. The aluminum alloy section not modified in the comparative example 1 has the film adhesion of 0 grade only in a dry state, and is easy to generate the defects of foaming, delamination and wrinkling after a boiling test.
Claims (6)
1. The aluminum profile spraying pretreatment liquid is characterized by comprising an oil removing polishing liquid and a modifying liquid:
wherein the oil-removing polishing solution comprises 5-30 g/L of oxalic acid, 0.5-4 g/L of ammonium bifluoride, 0.001-0.01 g/L of surfactant and 0.05-0.5 g/L of assistant;
the modified liquid comprises 0.5-5 g/L g/l oxalic acid, 0.05-1.0 g/L g/l ammonium bifluoride and 0.5-5 g/l modified acrylic resin.
2. The aluminum profile spraying pretreatment liquid as recited in claim 1, characterized in that: the surfactant comprises one or more of alkylphenol polyoxyethylene, octylphenol polyoxyethylene, nonylphenol polyoxyethylene, glycerin fatty acid ester and sorbitan fatty acid ester; the auxiliary agent comprises sodium salt: one or more of sodium nitrite, sodium oxalate, sodium fluoride, sodium carbonate, sodium bicarbonate and sodium sulfate.
3. The aluminum profile spraying pretreatment liquid as recited in claim 1, characterized in that: al in the oil removing polishing solution and the modifying solution3+The equilibrium concentration is less than 1 g/L.
4. The aluminum profile spraying pretreatment liquid as recited in claim 1, characterized in that: the modified acrylic resin is a stable aqueous solution with the pH value of 1-3.
5. The aluminum profile spraying pretreatment liquid as recited in claim 1, characterized in that: the oil removing polishing solution and the modifying solution are used in sequence of firstly removing the oil polishing solution and then modifying the solution.
6. A spraying pretreatment method of an aluminum profile is characterized in that the pretreatment liquid as claimed in claim 1 is used, and comprises the following steps:
(1) oil removal and polishing: placing the aluminum profile to be treated in an oil removal polishing solution, reacting until bubbles emerge from the treatment solution, then continuing to soak and react for 1-10 min, and covering a uniform composite salt film protective layer on the surface of the aluminum profile and the low-lying part of the aluminum profile;
(2) modifying the membrane: and dripping the degreased and polished aluminum profile into the modification solution, and soaking for 1-5 min to form a hydrophobic modification film on the composite salt film protection layer.
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