CN115301519A - Preparation process of high-hardness color-coated sheet and high-hardness color-coated sheet - Google Patents
Preparation process of high-hardness color-coated sheet and high-hardness color-coated sheet Download PDFInfo
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- CN115301519A CN115301519A CN202210775720.XA CN202210775720A CN115301519A CN 115301519 A CN115301519 A CN 115301519A CN 202210775720 A CN202210775720 A CN 202210775720A CN 115301519 A CN115301519 A CN 115301519A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 62
- 239000011248 coating agent Substances 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000003973 paint Substances 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000003822 epoxy resin Substances 0.000 claims abstract description 22
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000003085 diluting agent Substances 0.000 claims abstract description 14
- 239000004645 polyester resin Substances 0.000 claims abstract description 11
- 229920001225 polyester resin Polymers 0.000 claims abstract description 11
- 239000004113 Sepiolite Substances 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 10
- 239000013538 functional additive Substances 0.000 claims abstract description 10
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 10
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000005498 polishing Methods 0.000 claims abstract description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 239000004816 latex Substances 0.000 claims abstract description 7
- 229920000126 latex Polymers 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000005238 degreasing Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 10
- 239000002518 antifoaming agent Substances 0.000 claims description 9
- 238000004381 surface treatment Methods 0.000 claims description 9
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 229910017059 organic montmorillonite Inorganic materials 0.000 claims description 7
- 238000002161 passivation Methods 0.000 claims description 4
- 239000002318 adhesion promoter Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 239000011256 inorganic filler Substances 0.000 description 4
- 229910003475 inorganic filler Inorganic materials 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical group O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Classifications
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- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
- B05D5/066—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones achieved by multilayers
-
- 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
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
-
- 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
-
- 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
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- C09D5/002—Priming paints
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- 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
-
- 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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
-
- 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
- B05D2602/00—Organic fillers
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of household appliance shells, and particularly discloses a preparation process of a high-hardness color-coated sheet and the high-hardness color-coated sheet. A preparation process of a high-hardness color-coated plate comprises the following steps: s1, degreasing and passivating; s2, coating a primer; s3, polishing the primer layer; s4, coating finish paint; the finish paint comprises the following raw materials: polyester resin, epoxy resin, flexible hardening particles, functional additives, diluents and curing agents; the flexible hardening particles are prepared by the following method: collecting powder for polishing the primer layer in the step S3, and filtering impurities for later use; uniformly mixing the powder, the glass flakes, the sepiolite fibers and the polytetrafluoroethylene micro powder, adding the latex powder, and grinding to obtain the flexible hardening particles with the particle size of less than or equal to 50 microns. The color-coated sheet has better toughness, higher hardness and excellent wear resistance, and the prepared color-coated sheet does not need to be coated with a film additionally, thereby being beneficial to reducing the production cost.
Description
Technical Field
The application relates to the technical field of household appliance shell plates, in particular to a preparation process of a high-hardness color-coated plate and the high-hardness color-coated plate.
Background
The conventional home appliance housing sheet material is produced by using a galvanized sheet, a stainless steel sheet, etc. as a base material, and then coating or laminating various organic coatings or plastic films on the surface of the base material to obtain a color-coated sheet. Because the home appliance color plate is packaged by coiling, the flexibility of the base material is required, and the flexibility of the coating on the surface of the base material is also required; generally, when the flexibility of the coating is relatively high, the hardness is not high, and therefore a protective film is required to be coated during each processing turn to protect the surface of the coating from abrasion scratch, but this results in an increase in production cost. And because the surface coating of the color plate has low hardness, poor scratch resistance and wear resistance, the surface of the color plate is easy to wear and scratch in the daily use process, the appearance quality of the product is poor, and the product attractiveness is affected.
In order to increase the hardness of the coating on the surface of the color plate, inorganic fillers such as ceramic powder, quartz powder, titanium dioxide and the like can be generally added into the coating, and the addition of the inorganic fillers can not only increase the hardness of the coating, but also reduce the dosage of resin in the coating and reduce the cost. However, since the inorganic filler has a large particle diameter ratio and poor compatibility with resin, it needs to be sufficiently ground before being mixed with resin, and the inorganic filler is easily agglomerated in the coating, which not only increases the processing difficulty, but also results in that the actual hardness of the coating cannot be significantly improved.
Therefore, there is a need for a color coated sheet that can increase its hardness without affecting its flexibility.
Disclosure of Invention
In order to solve the above problems, the present application provides a preparation process of a high-hardness color-coated sheet and a high-hardness color-coated sheet.
In a first aspect, the application provides a preparation process of a high-hardness color-coated sheet, which adopts the following technical scheme: a preparation process of a high-hardness color-coated plate comprises the following steps:
s1, preparing a metal substrate, and performing degreasing passivation treatment on the surface of the metal substrate to form a chemical treatment layer;
s2, coating a primer on the chemical treatment layer of the metal substrate, and drying to form a primer layer;
s3, after polishing the primer layer, blowing away powder attached to the surface of the primer layer to obtain the primer layer after surface treatment;
s4, coating finish paint on the primer layer after surface treatment, and drying to obtain a finish paint layer;
the finish paint comprises the following raw materials in parts by weight: 80-90 parts of polyester resin, 10-15 parts of epoxy resin, 6-8 parts of flexible hardening particles, 3-6 parts of functional additives, 30-40 parts of diluents and 20-30 parts of curing agents;
the flexible hardening particles are prepared by the following method: collecting powder for polishing the primer layer in the step S3, and filtering impurities for later use; uniformly mixing 10-15 parts by weight of powder, 20-30 parts by weight of glass flakes, 10-20 parts by weight of sepiolite fibers and 4-6 parts by weight of polytetrafluoroethylene micro powder, adding 20-30 parts by weight of latex powder, and grinding to obtain the flexible hardening particles with the particle size of less than or equal to 50 microns.
By adopting the technical scheme, the finish paint takes the polyester resin and the epoxy resin as matrix materials, and can simultaneously meet the requirements of high hardness and high toughness; meanwhile, the flexible hardening particles are used as the filler, so that the hardness and the wear resistance of the coating can be obviously improved under the condition of not reducing the toughness of the coating, and the prepared color-coated plate does not need to be coated with a film additionally, thereby being beneficial to reducing the production cost.
The finish paint is added with flexible hardening particles prepared from glass flakes, sepiolite fibers, polytetrafluoroethylene micro powder, ground powder of the primer layer and latex powder. The glass flakes have high adhesive force and ageing resistance, and also have good wear resistance and scratch resistance, and the hardness and wear resistance of the coating can be improved. The sepiolite fiber is also called sepiolite mineral fiber, can improve the hardness and the wear resistance of the coating, and can improve the dispersibility of the filler in the resin, improve the toughness of the coating and reduce the cracking phenomenon of the coating because the fiber structure of the sepiolite fiber can be used as a bridging agent between the filler and the resin.
The polytetrafluoroethylene micropowder has good wear resistance and dispersibility, can be easily and uniformly blended with other raw materials, but because the polytetrafluoroethylene micropowder has good self-lubricity and non-adhesiveness, the excessive addition can influence the binding force of the coating and a base material.
The primer layer can be polished to remove the coating with low surface adhesion, so that the binding force between the finish paint layer and the primer layer is improved; the ground powder belongs to the dried and cured coating, and although the ground powder cannot be used as the coating, when the ground powder is used as a filler in a finish paint, on one hand, the utilization rate of raw materials can be improved, and the cost is reduced; on the other hand, the hardness of the coating can be improved, and the performance of the coating can be improved; however, when the coating is directly used, the toughness of the coating is reduced, and the coating is easy to crack.
Therefore, after the ground primer layer powder, the glass flakes, the sepiolite fibers, the polytetrafluoroethylene micro powder and the latex powder are mixed, the particle size of the flexible hardening particles can be increased and decreased in the grinding process, and the dispersity of the flexible hardening particles in the coating is improved; on the other hand, the obtained flexible hardening particles can not cause the reduction of the toughness of the coating under the condition of improving the hardness and the wear resistance of the coating. The finish paint obtained by the method has good bonding strength, is not easy to fall off and crack, has high hardness and excellent wear resistance, and has long service life.
Optionally, the finish paint is prepared by the following method: according to the proportion, after the polyester resin, the epoxy resin and the flexible hardening particles are uniformly stirred, the diluent and the functional additive are added and uniformly stirred, then the curing agent is added and uniformly stirred, and the finish paint is obtained.
Optionally, the primer comprises the following raw materials in parts by weight: 100 parts of epoxy resin, 3-6 parts of functional assistant, 4-6 parts of organic montmorillonite, 30-40 parts of diluent and 30-40 parts of curing agent.
By adopting the technical scheme, the primer takes the epoxy resin as a base material, the epoxy resin has good adhesive force to the metal base material, and the epoxy resin can improve the binding force between the finish paint and the base material when being used as the primer; the organic montmorillonite added into the epoxy resin can improve the wear resistance and the bending strength of the primer layer and improve the hardness and the toughness of the primer layer.
Optionally, the primer is prepared by the following method: adding the functional additive into the epoxy resin according to the proportion, and stirring at the speed of 200-500r/min for 10-20min; then adding organic montmorillonite and diluent, stirring at the speed of 800-1000r/min for 20-30min, adding curing agent, and stirring uniformly to obtain the primer.
Optionally, the functional assistant is one or a mixture of more of a leveling agent, a dispersing agent, an adhesion promoter and a defoaming agent.
By adopting the technical scheme, the addition of the flatting agent, the dispersing agent, the adhesion promoter and the defoaming agent can improve the processing performance of the coating and the appearance quality of the coating.
Optionally, in S2, a primer layer is formed by means of segmented drying and multiple coating, and the specific operations are as follows: coating a primer on the chemical treatment layer of the metal substrate, drying at the temperature of 170-180 ℃ for 2-3min, and drying at the temperature of 65-70 ℃ for 2-3h; then coating the primer again, drying at 170-180 ℃ for 4-6min, and then drying at 65-70 ℃ for 1-2h to obtain the primer layer with the thickness of 30-40 mu m.
By adopting the technical scheme, the primer layer of the color-coated plate is prepared by adopting a segmented drying and multiple coating mode, so that the adhesive force of the primer layer to the base material can be improved, certain thickness of the primer layer can be ensured, and the integral hardness and toughness of the coating can be improved.
Optionally, in S3, the thickness of the primer layer after the surface treatment is 10 to 15 μm.
Optionally, the drying temperature in the step S4 is 220-230 ℃, and the drying time is 10-20min.
In a second aspect, the present application provides a high-hardness color-coated sheet prepared by a process for preparing a high-hardness color-coated sheet.
In summary, the present application has the following beneficial effects:
1. the finish paint used by the color-coated plate takes polyester resin and epoxy resin as base materials, and can meet the requirements of high hardness and high toughness at the same time; meanwhile, the flexible hardening particles are used as the filler, so that the hardness and the wear resistance of the coating can be obviously improved under the condition of not reducing the toughness of the coating, and the service life of the color-coated plate is prolonged.
2. The priming paint layer of the color-coated plate is prepared by adopting a sectional drying and multiple coating mode, so that the adhesive force of the priming paint layer to a substrate can be improved, certain thickness can be ensured, and the improvement of the integral hardness and toughness of the coating is facilitated.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of primer
The starting materials in the preparation examples are commercially available, unless otherwise specified. Wherein the epoxy resin is selected from epoxy resin E44; the organic montmorillonite is selected from organic sodium montmorillonite with fineness of 400 meshes; the diluent is formed by mixing xylene and n-butanol according to the weight ratio of 1:1; the curing agent is 650 low molecular polyamide curing agent; the functional additive consists of an antifoaming agent and a wetting dispersant in a weight ratio of 1:1, wherein the antifoaming agent is selected from an organic silicon antifoaming agent, and the wetting dispersant is selected from BYK-163.
The primer is prepared by the following method:
adding 5kg of functional additive into 100kg of epoxy resin, and stirring for 15min at the speed of 400 r/min; then adding 5kg of organic montmorillonite and 35kg of diluent, stirring at the speed of 900r/min for 25min, adding 35kg of curing agent, and stirring uniformly to obtain the primer.
Examples
The starting materials in the examples are all commercially available, unless otherwise specified. The type of the metal substrate is not particularly limited, and may be a hot-dip galvanized sheet, an electro-galvanized sheet, a galvanized aluminum magnesium sheet, a stainless steel sheet, etc., and the stainless steel sheet is used in the following examples; the primer is prepared from a preparation example of the primer; the polyester resin in the finish paint is selected from saturated polyester resin SN883; the epoxy resin is selected from epoxy resin E44; the diluent is formed by mixing xylene and n-butanol according to the weight ratio of 7:3; the curing agent is TGIC curing agent; the functional additive consists of an antifoaming agent and a wetting dispersant in a weight ratio of 1:1, wherein the antifoaming agent is selected from an organic silicon antifoaming agent, and the wetting dispersant is selected from BYK-163.
Examples 1 to 3
As shown in table 1, examples 1 to 3 are mainly different in the amount of the topcoat material and the soft hardness particles, and will be described below by taking example 1 as an example.
The preparation process of the high-hardness color-coated sheet provided in embodiment 1 includes the following steps:
s1, preparing a metal substrate, and carrying out degreasing passivation treatment on the surface of the metal substrate to form a chemical treatment layer;
s2, coating a primer on the chemical treatment layer of the metal substrate, drying at the temperature of 175 ℃ for 2min, and then drying at the temperature of 68 ℃ for 2.5h; then coating the primer again, drying at 175 ℃ for 5min, and then drying at 68 ℃ for 1.5h to obtain a primer layer with the thickness of 35 mu m;
s3, polishing the primer layer by using No. 400 abrasive paper, and blowing away powder attached to the surface of the primer layer to obtain a 10-micron-thickness primer layer after surface treatment;
s31, collecting powder for polishing the primer layer in the step S3, and filtering impurities for later use; uniformly mixing powder material glass flakes, sepiolite fibers and polytetrafluoroethylene micro powder, adding redispersible latex powder, and grinding to obtain flexible hardening particles with the particle size of less than or equal to 50 microns;
s32, mixing polyester resin, epoxy resin and flexible hardening particles, uniformly stirring at the speed of 200r/min, adding a diluent and a functional auxiliary agent, uniformly stirring at the speed of 800r/min, adding a curing agent, and stirring at the speed of 200r/min for 3min to obtain finish paint;
and S4, coating a finish paint on the primer layer after the surface treatment, and drying at the temperature of 210 ℃ for 15min to obtain a finish paint layer with the thickness of 25 mu m.
TABLE 1 raw material usage scale (unit: kg) for the top coats and soft-hardened particles in examples 1-3
Comparative example
Comparative example 1
The difference between the comparative example and the example 1 is that S2 and S3, S2 are coated only once, the primer layer in S3 is not polished, and the flexible hardening particles in the finish paint are replaced by the same amount of ceramic powder.
The specific preparation process of the color-coated sheet of comparative example 1 comprises the following steps:
s1, preparing a metal substrate, and performing degreasing passivation treatment on the surface of the metal substrate to form a chemical treatment layer;
s2, coating a primer on the chemical treatment layer of the metal substrate, drying at 175 ℃ for 2min, and then drying at 68 ℃ for 2.5h to obtain a primer layer with the thickness of 15 microns;
s3, uniformly stirring 8kg of polyester resin, 1kg of epoxy resin and 0.6kg of ceramic powder with the particle size of 50 microns, adding 2kg of diluent and 0.3kg of functional additive, uniformly stirring, adding a curing agent, and uniformly stirring to obtain finish paint;
and S4, coating finish paint on the primer layer after surface treatment, and drying to obtain a finish paint layer with the thickness of 25 mu m.
Comparative example 2
The comparative example differs from example 1 in S31 and S32, specifically: s31 is not included, and the flexible hardening particles are replaced by the same amount of ceramic powder in the raw materials of the finishing paint.
Comparative example 3
The comparative example differs from example 1 in S31 and S32, specifically: the flexible hardening particles are replaced by the same amount of powder of the S3 polished primer layer; s31 comprises the following steps: and (4) collecting the powder for polishing the primer layer in the step (S3), filtering impurities, and directly grinding the powder to obtain the powder with the particle size of less than or equal to 50 microns.
Performance test
The properties of the color-coated sheets prepared in examples 1 to 3 and comparative examples 1 to 3 were measured in the following manner, and the results are reported in table 2.
Hardness: and (3) scribing 5 straight lines on the surface of the plate by using a Mitsubishi test pencil, wherein an angle of 45 degrees is formed between the Mitsubishi test pencil and the surface of the plate by using a force of 1kg, and two or more of the 5 straight lines are unqualified, so that the hardness of the pencil on the surface of the plate is obtained. The pencil hardness is 9B, 8B, 7B, 6B, 5B, 4B, 3B, 2B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H and 9H from soft to hard.
Flexibility: the test is carried out according to the method in GB/T1731-2020 paint film and putty film flexibility determination method, and the flexibility is respectively 1mm, 2mm, 3mm, 4mm, 5mm, 10mm and 15mm according to the diameter of the shaft rod.
Adhesion force: the test is carried out according to the method in GB/T9286-2021 test for drawing checks of colored paint and varnish, and the test results are respectively 0 grade, 1 grade, 2 grade, 3 grade, 4 grade and 5 grade from good to poor.
Wear resistance: testing is carried out according to a method in GB/T1768-2006 rotating rubber grinding wheel method for measuring the wear resistance of colored paint and varnish; abrasion resistance is expressed in terms of the loss of mass of the paint film after a specified number of rubbing cycles, or in terms of the number of cycles required to rub off the coating to the next coating or substrate; the abrasion resistance of the present application is expressed in terms of the loss of mass of the paint film after 1000 cycles of rubbing.
TABLE 2 Performance test Table for examples and comparative color coated sheets
By combining the example 1 and the comparative examples 1 to 3 and combining the table 2, the color steel plate prepared by the process of the application has high hardness, and the coating has good flexibility, adhesion and wear resistance. The method is characterized in that the steps are cooperated, and when the primer layer is prepared, the thickness of the primer layer can be improved and the adhesive force of the primer layer to the metal base material can be improved by adopting a segmented drying and multiple coating mode; and then, the surface of the primer layer is treated by a polishing method, so that the coating with poor surface adhesion can be removed, and the binding force between the primer layer and the finish paint layer can be improved. And then, when the finish paint is prepared, the powder of the ground primer is reused, and is mixed with the glass flakes, the sepiolite fibers, the polytetrafluoroethylene micro powder and the redispersible latex powder to obtain flexible hardening particles, the flexible hardening particles have good compatibility with resin materials in the finish paint, so that the processing is easier, the hardness and the wear resistance of the obtained flexible hardening particles can be obviously improved under the condition of not influencing the toughness of the coating, the obtained coating is not easy to fall off and crack, additional film covering is not needed, and the production cost can be reduced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A preparation process of a high-hardness color-coated plate is characterized by comprising the following steps:
s1, preparing a metal substrate, and carrying out degreasing passivation treatment on the surface of the metal substrate to form a chemical treatment layer;
s2, coating a primer on the chemical treatment layer of the metal substrate, and drying to form a primer layer;
s3, after the primer layer is polished, blowing away powder attached to the surface of the primer layer to obtain the primer layer after surface treatment;
s4, coating finish paint on the primer layer after surface treatment, and drying to obtain a finish paint layer;
the finish paint comprises the following raw materials in parts by weight: 80-90 parts of polyester resin, 10-15 parts of epoxy resin, 6-8 parts of flexible hardening particles, 3-6 parts of functional additives, 30-40 parts of diluents and 20-30 parts of curing agents;
the flexible hardening particles are prepared by the following method: collecting powder for polishing the primer layer in the step S3, and filtering impurities for later use; uniformly mixing 10-15 parts by weight of powder, 20-30 parts by weight of glass flakes, 10-20 parts by weight of sepiolite fibers and 4-6 parts by weight of polytetrafluoroethylene micro powder, adding 20-30 parts by weight of latex powder, and grinding to obtain flexible hardening particles with the particle size of less than or equal to 50 microns.
2. The preparation process of the high-hardness color-coated plate according to claim 1, wherein the finish paint is prepared by the following method: according to the proportion, after the polyester resin, the epoxy resin and the flexible hardening particles are uniformly stirred, the diluent and the functional auxiliary agent are added and uniformly stirred, then the curing agent is added and uniformly stirred, and the finish paint is obtained.
3. The preparation process of the high-hardness color-coated plate according to claim 1, wherein the primer comprises the following raw materials in parts by weight: 100 parts of epoxy resin, 3-6 parts of functional assistant, 4-6 parts of organic montmorillonite, 30-40 parts of diluent and 30-40 parts of curing agent.
4. The process for preparing a high-hardness color-coated plate according to claim 3, wherein the primer is prepared by the following method: adding the functional additive into the epoxy resin according to the proportion, and stirring at the speed of 200-500r/min for 10-20min; then adding organic montmorillonite and diluent, stirring at the speed of 800-1000r/min for 20-30min, adding curing agent, and stirring uniformly to obtain the primer.
5. The process for preparing a high-hardness color-coated plate according to any one of claims 1 or 3, wherein the functional assistant is one or more of a leveling agent, a dispersing agent, an adhesion promoter and an antifoaming agent.
6. The preparation process of a high-hardness color-coated plate according to claim 1, wherein the step S2 is to form a primer layer by means of segmented drying and multiple coating, and the specific operations are as follows: coating a primer on the chemical treatment layer of the metal substrate, drying at the temperature of 170-180 ℃ for 2-3min, and drying at the temperature of 65-70 ℃ for 2-3h; then coating the primer again, drying at 170-180 ℃ for 4-6min, and then drying at 65-70 ℃ for 1-2h to obtain the primer layer with the thickness of 30-40 mu m.
7. The process for preparing a high-hardness color-coated sheet according to claim 1, wherein in the step S3, the thickness of the primer layer after surface treatment is 10 to 15 μm.
8. The process for preparing a high-hardness color-coated sheet according to claim 1, wherein the drying temperature in S4 is 220 to 230 ℃ and the drying time is 10 to 20min.
9. A high-hardness color-coated sheet produced by the process for producing a high-hardness color-coated sheet according to any one of claims 1 to 8.
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Cited By (1)
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| CN116174278A (en) * | 2023-02-15 | 2023-05-30 | 苏州兴禾源复合材料有限公司 | PCM steel plate for air conditioner fan and preparation method thereof |
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