CN116511009A - Electrostatic coating process for product surface powder - Google Patents
Electrostatic coating process for product surface powder Download PDFInfo
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- CN116511009A CN116511009A CN202310530573.4A CN202310530573A CN116511009A CN 116511009 A CN116511009 A CN 116511009A CN 202310530573 A CN202310530573 A CN 202310530573A CN 116511009 A CN116511009 A CN 116511009A
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- coating process
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- 239000000843 powder Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009503 electrostatic coating Methods 0.000 title claims abstract description 14
- 238000002161 passivation Methods 0.000 claims abstract description 62
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000005507 spraying Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 238000000576 coating method Methods 0.000 claims abstract description 21
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 230000001070 adhesive effect Effects 0.000 claims abstract description 20
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 20
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 19
- 239000010452 phosphate Substances 0.000 claims abstract description 19
- 239000010453 quartz Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005238 degreasing Methods 0.000 claims abstract description 17
- 238000005530 etching Methods 0.000 claims abstract description 16
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000000428 dust Substances 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 32
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 32
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 32
- 239000012744 reinforcing agent Substances 0.000 claims description 25
- 239000002585 base Substances 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 229920001225 polyester resin Polymers 0.000 claims description 17
- 239000004645 polyester resin Substances 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 16
- 229920001577 copolymer Polymers 0.000 claims description 16
- 239000003822 epoxy resin Substances 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 16
- 229920001519 homopolymer Polymers 0.000 claims description 16
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims description 16
- 239000000049 pigment Substances 0.000 claims description 16
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 16
- 229920000647 polyepoxide Polymers 0.000 claims description 16
- -1 polysiloxane Polymers 0.000 claims description 16
- 229920001296 polysiloxane Polymers 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 16
- 239000011684 sodium molybdate Substances 0.000 claims description 16
- 235000015393 sodium molybdate Nutrition 0.000 claims description 16
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 16
- 239000004408 titanium dioxide Substances 0.000 claims description 16
- 239000011787 zinc oxide Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- 238000005260 corrosion Methods 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 8
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 6
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 239000000176 sodium gluconate Substances 0.000 claims description 6
- 235000012207 sodium gluconate Nutrition 0.000 claims description 6
- 229940005574 sodium gluconate Drugs 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 239000000047 product Substances 0.000 abstract description 89
- 239000011247 coating layer Substances 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 3
- 239000001038 titanium pigment Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 14
- 238000005520 cutting process Methods 0.000 description 5
- 238000007590 electrostatic spraying Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
-
- 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
- B05D2504/00—Epoxy polymers
-
- 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
- B05D2508/00—Polyesters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to the technical field of powder electrostatic coating, and discloses a product surface powder electrostatic coating process, which comprises the following steps of S1, cleaning: placing the product in a clear water tank, and primarily cleaning the product by clear water to clean dust and impurities adhered to the surface of the product; s2, degreasing; s3, alkali etching treatment; s4, neutralization treatment; s5, passivating; s6, spraying treatment; s7, curing treatment; s8, detection processing: detecting the product after curing treatment; according to the invention, a passivation treatment step is added in the whole coating process, and the passivation treatment can improve the adhesive force of a coating layer to a certain extent; the invention also adds the strengthening agent into the conventional powder material, the porous powder quartz contains hydroxyl groups, which is beneficial to improving the adhesive force of a coating layer, and the phosphate can generate a film on the surface of the product, and the film has the porosity, so that the melted material of the powder permeates into the pores and is tightly combined with the film, thereby improving the adhesive force, and the adhesive force of precipitated barium sulfate and titanium pigment to the powder can also be improved.
Description
Technical Field
The invention relates to the technical field of powder electrostatic coating, in particular to a product surface powder electrostatic coating process.
Background
The electrostatic powder coating is a coating sprayed by an electrostatic powder spray gun, is coated on a grounded coated object under the action of electrostatic attraction, and is heated, melted, solidified and formed into a film; the process has the advantages of reducing environmental pollution, saving energy, having excellent coating performance and the like.
Literature: the electrostatic spraying production process of the aluminum profile surface powder comprises the following steps of: TQ639.2, literature identification code: article number a: 1007-9548 (2007) 05-0038-02, in which an electrostatic spraying process is disclosed, specifically electrostatic spraying of aluminum profiles by pretreatment, degreasing, washing with water, neutralization, drying, spraying, baking and curing; the whole production process is more conventional, and the powder used for spraying is not subjected to specific special treatment, so that the coating adhesive force on the surface of the produced product is not improved, and the quality of the product produced by the process is not improved. Accordingly, one skilled in the art provides a product surface powder electrostatic coating process to solve the problems set forth in the background art.
Disclosure of Invention
The invention aims to provide a product surface powder electrostatic coating process for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the electrostatic coating process for the product surface powder comprises the following steps:
s1, cleaning: placing the product in a clear water tank, and primarily cleaning the product by clear water to clean dust and impurities adhered to the surface of the product;
s2, degreasing: placing the product cleaned by clear water in a degreasing tank, degreasing by degreasing liquid, and removing greasy dirt on the surface of the product;
s3, alkali etching: placing the degreased product in an alkaline etching tank, and performing alkaline etching treatment by using alkaline etching liquid to remove the residual oxide film and modified alloy on the surface of the product;
s4, neutralization treatment: the product subjected to alkali corrosion treatment is placed in a neutralization tank to be subjected to neutralization treatment through a neutralization liquid, so that alkali corrosion speckles and wandering on the surface of the product are avoided, the neutralization treatment is performed on the alkali corrosion liquid, and then the product is cleaned once again through clear water;
s5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle;
s7, curing: placing the sprayed product in a drying room for baking and curing, so that the powder is melted and uniformly coated on the surface of the product;
s8, detection processing: detecting the cured product, detecting whether the surface of the product is smooth and bright, and detecting whether the product has a granular feel and the like, and reworking the defective product.
As still further aspects of the invention: the degreasing fluid in the S2 consists of sodium hydroxide, sodium carbonate, sodium gluconate, isomeric alcohol polyoxyethylene ether and water, wherein the mass ratio of the sodium hydroxide to the sodium carbonate to the sodium gluconate to the isomeric alcohol polyoxyethylene ether to the water is 1:5:1:1:25.
as still further aspects of the invention: the alkaline etching solution in the step S3 consists of sodium phosphate solution; the neutralization solution in the step S4 consists of a nitric acid solution.
As still further aspects of the invention: the soaking time in the step S5 is 20min, and the thickness of the passivation film is 0.5-2 um.
As still further aspects of the invention: the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 8-10: 2:0.7:0.2: 12-16.
As still further aspects of the invention: the powder in the S6 consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1.
as still further aspects of the invention: the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1.
as still further aspects of the invention: the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 3-5: 1 to 3:0.5:0.3.
as still further aspects of the invention: the baking and curing temperature is 220 ℃, and the baking and curing time is 25min.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a passivation treatment step is added in the whole coating process, the surface of a product is subjected to passivation treatment through passivation liquid, and then spraying is carried out, so that the adhesive force of a coating layer can be improved to a certain extent through passivation treatment; the invention also adds the strengthening agent composed of porous powder quartz, phosphate, precipitated barium sulfate and titanium pigment into the conventional powder material, the porous powder quartz contains hydroxyl groups, which is helpful for improving the adhesive force of a coating layer, the phosphate can generate a film on the surface of a product, the film has porosity, so that the fused material of the powder permeates into the pores and is tightly combined with the film, thereby improving the adhesive force, the precipitated barium sulfate and the titanium pigment have a crosslinking catalytic function on polyester resin in the powder, and the adhesive force can also be improved, and the adhesive force of a coating after electrostatic powder coating is further improved by adding the strengthening agent, thereby improving the coating quality.
Detailed Description
The electrostatic coating process for the product surface powder comprises the following steps:
s1, cleaning: placing the product in a clear water tank, and primarily cleaning the product by clear water to clean dust and impurities adhered to the surface of the product;
s2, degreasing: placing the product cleaned by clear water in a degreasing tank, degreasing by degreasing liquid, and removing greasy dirt on the surface of the product; the degreasing fluid is composed of sodium hydroxide, sodium carbonate, sodium gluconate, isomeric alcohol polyoxyethylene ether and water, wherein the mass ratio of the sodium hydroxide to the sodium carbonate to the sodium gluconate to the isomeric alcohol polyoxyethylene ether to the water is 1:5:1:1:25, a step of selecting a specific type of material;
s3, alkali etching: placing the degreased product in an alkaline etching tank, and performing alkaline etching treatment by using alkaline etching liquid to remove the residual oxide film and modified alloy on the surface of the product; the alkaline etching solution consists of sodium phosphate solution;
s4, neutralization treatment: the product subjected to alkali corrosion treatment is placed in a neutralization tank to be subjected to neutralization treatment through a neutralization liquid, so that alkali corrosion speckles and wandering on the surface of the product are avoided, the neutralization treatment is performed on the alkali corrosion liquid, and then the product is cleaned once again through clear water; the neutralization solution consists of nitric acid solution;
s5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period; the soaking time is 20min, and the thickness of the passivation film is 0.5-2 um; the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 8-10: 2:0.7:0.2: 12-16;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle;
the powder consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1, a step of; the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1, a step of; the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 3-5: 1 to 3:0.5:0.3;
s7, curing: placing the sprayed product in a drying room for baking and curing, so that the powder is melted and uniformly coated on the surface of the product; the baking and curing temperature is 220 ℃, and the baking and curing time is 25min;
s8, detection processing: detecting the cured product, detecting whether the surface of the product is smooth and bright, and detecting whether the product has a granular feel and the like, and reworking the defective product.
Example 1
S5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period; the soaking time is 20min, and the thickness of the passivation film is 0.5-2 um; the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 8:2:0.7:0.2:12;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle; the powder consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1, a step of; the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1, a step of; the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 3:1:0.5:0.3;
S1-S4 and S7-S8 are unchanged.
Example two
S5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period; the soaking time is 20min, and the thickness of the passivation film is 0.5-2 um; the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 8.5:2:0.7:0.2:13;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle; the powder consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1, a step of; the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1, a step of; the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 3.5:1.5:0.5:0.3;
S1-S4 and S7-S8 are unchanged.
Example III
S5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period; the soaking time is 20min, and the thickness of the passivation film is 0.5-2 um; the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 9:2:0.7:0.2:14;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle; the powder consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1, a step of; the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1, a step of; the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 4:2:0.5:0.3;
S1-S4 and S7-S8 are unchanged.
Example IV
S5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period; the soaking time is 20min, and the thickness of the passivation film is 0.5-2 um; the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 9.5:2:0.7:0.2:15;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle; the powder consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1, a step of; the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1, a step of; the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 4.5:2.5:0.5:0.3;
S1-S4 and S7-S8 are unchanged.
Example five
S5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period; the soaking time is 20min, and the thickness of the passivation film is 0.5-2 um; the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, wherein the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 10:2:0.7:0.2:16;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle; the powder consists of a base material, a leveling agent and a reinforcing agent, wherein the mass ratio of the base material to the leveling agent to the reinforcing agent is 10:1:1, a step of; the base material consists of epoxy resin, polyester resin, pigment and filler, wherein the mass ratio of the epoxy resin to the polyester resin to the pigment to the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1, a step of; the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, wherein the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 5:3:0.5:0.3;
S1-S4 and S7-S8 are unchanged.
To further demonstrate the technical effect of the present invention, verification was performed by the following experiments:
the products produced by selecting the first, second, third, fourth and fifth embodiments of the invention are experimental examples A, B, C, D, E;
the product produced by removing the reinforcing agent in S5 and S6 is selected as an experimental example F;
the product produced in the first to sixth steps in the electrostatic powder coating process (grant publication number CN 112206954B) is selected as experiment example P; adding the powder in the S6 of the invention between the second step and the fourth step, replacing the powder in the fourth step, and marking the produced product as an experimental example Q;
setting conditions such as temperature and time in processing to be consistent, and setting the initial products used in processing to be consistent;
cutting the coating to penetrate to the substrate by adopting a cutting tool in a right-angle grid pattern to evaluate the detachment resistance, namely the adhesive force strength, of the coating from the substrate;
the adhesion strength was divided into five classes: level 0 represents that the cut edge is completely smooth, no grid is dropped; grade 1 represents that there is some coating shedding at the kerf intersections, but the cross-cut area is not significantly affected by more than 5%; grade 2 represents coating shedding at the kerf intersections and/or along kerf edges, with affected crossover cutting areas significantly greater than 5%, but not significantly greater than 15%; grade 3 represents that the coating is partially or completely exfoliated in large fragments along the cut edge and/or partially or completely exfoliated at different locations of the lattice, the affected cross-cut area being significantly greater than 15%, but not significantly greater than 35%; the 4-stage coating is peeled off in large fragments along the cutting edge and/or is partially or totally peeled off at different parts of the grid, the affected cross cutting area is obviously more than 35 percent, but not obviously more than 65 percent; grade 5 represents a degree of exfoliation exceeding grade 4;
| experimental item | Experimental example A | Experimental example B | Experimental example C | Experimental example D | Experimental example E | Experimental example F | Experimental example P | Experimental example Q |
| Adhesive force strength | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 0 |
From the above table, it can be analyzed that: the electrostatic powder coating of the product of experimental example A, B, C, D, E, Q with the enhancer of the invention S5 and S6 had a strong adhesion, reaching level 0, while the experimental example F, Q without the enhancer of the invention S5 and S6 had a relatively weak adhesion, being level 2.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (9)
1. The electrostatic coating process for the product surface powder is characterized by comprising the following steps of:
s1, cleaning: placing the product in a clear water tank, and primarily cleaning the product by clear water to clean dust and impurities adhered to the surface of the product;
s2, degreasing: placing the product cleaned by clear water in a degreasing tank, degreasing by degreasing liquid, and removing greasy dirt on the surface of the product;
s3, alkali etching: placing the degreased product in an alkaline etching tank, and performing alkaline etching treatment by using alkaline etching liquid to remove the residual oxide film and modified alloy on the surface of the product;
s4, neutralization treatment: the product subjected to alkali corrosion treatment is placed in a neutralization tank to be subjected to neutralization treatment through a neutralization liquid, so that alkali corrosion speckles and wandering on the surface of the product are avoided, the neutralization treatment is performed on the alkali corrosion liquid, and then the product is cleaned once again through clear water;
s5, passivation treatment: placing the neutralized product in a passivation tank, soaking the neutralized product in passivation solution to form a passivation film on the surface of the neutralized product, and improving the adhesive force of the powder spraying in the later period;
s6, spraying treatment: placing the product subjected to passivation treatment in a powder spraying room, spraying powder through a spray gun, and enabling the powder to adhere to the product through an electrostatic principle;
s7, curing: placing the sprayed product in a drying room for baking and curing, so that the powder is melted and uniformly coated on the surface of the product;
s8, detection processing: detecting the cured product, detecting whether the surface of the product is smooth and bright, and detecting whether the product has a granular feel and the like, and reworking the defective product.
2. The electrostatic coating process for the product surface powder according to claim 1, wherein the degreasing fluid in S2 is composed of sodium hydroxide, sodium carbonate, sodium gluconate, isomeric alcohol polyoxyethylene ether and water, and the mass ratio of the sodium hydroxide, the sodium carbonate, the sodium gluconate, the isomeric alcohol polyoxyethylene ether and the water is 1:5:1:1:25.
3. the electrostatic product surface powder coating process according to claim 1, wherein the alkaline etching solution in S3 consists of sodium phosphate solution; the neutralization solution in the step S4 consists of a nitric acid solution.
4. The electrostatic product surface powder coating process according to claim 1, wherein the soaking time in S5 is 20min, and the thickness of the passivation film is 0.5-2 um.
5. The electrostatic coating process for the surface powder of the product according to claim 1, wherein the passivation solution consists of phosphoric acid, zinc oxide, sodium molybdate, nickel nitrate and water, and the mass ratio of the phosphoric acid to the zinc oxide to the sodium molybdate to the nickel nitrate to the water is 8-10: 2:0.7:0.2: 12-16.
6. The electrostatic product surface powder coating process according to claim 1, wherein the powder in S6 consists of a base material, a leveling agent and a reinforcing agent, and the mass ratio of the base material, the leveling agent and the reinforcing agent is 10:1:1.
7. the electrostatic product surface powder coating process according to claim 6, wherein the base material is composed of epoxy resin, polyester resin, pigment and filler, and the mass ratio of the epoxy resin, the polyester resin, the pigment and the filler is 3:2:0.5:0.3; the leveling agent consists of acrylate homopolymer and copolymer, polysiloxane and polyvinyl butyral, wherein the mass ratio of the acrylate homopolymer to copolymer to the polysiloxane to the polyvinyl butyral is 2:1:1.
8. the electrostatic coating process for product surface powder according to claim 6, wherein the reinforcing agent consists of porous powder quartz, phosphate, precipitated barium sulfate and titanium dioxide, and the mass ratio of the porous powder quartz to the phosphate to the precipitated barium sulfate to the titanium dioxide is 3-5: 1 to 3:0.5:0.3.
9. the process of claim 1, wherein the baking and curing temperature is 220 ℃ and the baking and curing time is 25 minutes.
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| CN108641434A (en) * | 2018-05-30 | 2018-10-12 | 陈建峰 | A kind of preparation method of high adhesion fire retardant, anticorrosive metallic paint |
| CN115725215A (en) * | 2022-11-08 | 2023-03-03 | 擎天材料科技有限公司 | Powder coating easy to demould and preparation method and application thereof |
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