CN116273762A - Curing process of color-coated plates of functional household appliances - Google Patents
Curing process of color-coated plates of functional household appliances Download PDFInfo
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- CN116273762A CN116273762A CN202310166646.6A CN202310166646A CN116273762A CN 116273762 A CN116273762 A CN 116273762A CN 202310166646 A CN202310166646 A CN 202310166646A CN 116273762 A CN116273762 A CN 116273762A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003973 paint Substances 0.000 claims abstract description 37
- 238000000576 coating method Methods 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000007639 printing Methods 0.000 claims abstract description 8
- 238000007650 screen-printing Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 230000003746 surface roughness Effects 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000001723 curing Methods 0.000 claims description 56
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 229920006305 unsaturated polyester Polymers 0.000 claims description 7
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000002585 base Substances 0.000 claims description 5
- JQRRFDWXQOQICD-UHFFFAOYSA-N biphenylen-1-ylboronic acid Chemical compound C12=CC=CC=C2C2=C1C=CC=C2B(O)O JQRRFDWXQOQICD-UHFFFAOYSA-N 0.000 claims description 5
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims description 5
- 238000002161 passivation Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 238000009500 colour coating Methods 0.000 claims description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 4
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 229960004063 propylene glycol Drugs 0.000 claims description 3
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 235000013772 propylene glycol Nutrition 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000005097 cold rolling Methods 0.000 claims 1
- 238000005098 hot rolling Methods 0.000 claims 1
- 238000005554 pickling Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 15
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- 238000010586 diagram Methods 0.000 description 3
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 235000010215 titanium dioxide Nutrition 0.000 description 2
- 241001301450 Crocidium multicaule Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
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Images
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
- 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
- B05D3/0272—After-treatment with ovens
-
- 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
- B05D3/06—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 exposure to radiation
- B05D3/061—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 exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
-
- 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
- B05D7/14—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
- B05D7/16—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 using synthetic lacquers or varnishes
-
- 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
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
-
- 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
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
-
- 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
- B05D2202/10—Metallic substrate based on Fe
- B05D2202/15—Stainless steel
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a curing process of a color-coated sheet of a functional household appliance, and belongs to the field of surface treatment of metal materials. The production process of the invention is as follows: s1, preparing, cleaning and passivating a substrate; s2, coating baking primer and finishing paint, wherein the thickness of the primer is 5-7 microns, the thickness of the finishing paint is 15-17 microns, and coiling the dried coating into a coil; furnace temperature T for baking finish paint Furnace with a heat exchanger Controlled to T Furnace with a heat exchanger ＝250+10(H Base group + ㏑ V-6R); wherein H is Base group Refers to the thickness of the substrate, mm; v refers to the running speed of a baking furnace production line, m/min; r refers to the surface roughness of the color-coated plate; s3, printing ink screen printing: cutting the color-coated coiled steelAnd (3) uniformly passing through the lower part of the ultraviolet curing lamp to be cured into a film. The invention produces a material suitable for high-end household appliances by adjusting the components of the color-coated finish paint and optimizing the curing process, and meets the requirement of good adhesion between the subsequent cured coating under the ultraviolet light condition and the color-coated plate body.
Description
Technical Field
The invention relates to the technical field of metal material surface treatment, in particular to a curing process of a color-coated sheet of a functional household appliance.
Background
Along with the expansion of the application of color-coated plates in the field of home appliances, some home appliances need to print patterns, LOGO, function marks and the like on the shells of the home appliances. At present, in order to meet the printing needs, a process which is economical and convenient to implement is realized on the surface of the color-coated plate in a UV (ultraviolet) ink silk screen printing mode: namely, printing ink with special patterns or marks on a specific area of the surface of the stamped color-coated plate through silk screen printing, and attaching the ink to the surface of the coating of the color-coated plate after UV curing.
The common color-coated plate coating has complete crosslinking reaction among molecules in the curing process, and the situation of poor adhesion of the ink is easy to occur after the ink is printed, so that the requirements of the household appliance manufacturing industry can not be met.
The patent of publication No. CN 111100498B discloses a UV-LED curing ink and application thereof, which has the advantages of shortening the screen printing curing time and improving the production efficiency, but only relates to ink formula adjustment, and a critical production process is not disclosed. The application of publication No. CN 107876354A discloses a color-coated sheet meeting the requirements of UV ink silk-screen printing technology and a production method thereof, wherein a single-coated steel belt after solidification is continuously coated on a finish coater, a special finish paint is coated, and then the finished product is obtained after solidification and cooling and is coiled, and the weight of the color-coated sheet is adjusted on the finish paint. The application of publication No. CN 115491103A discloses a waterborne polyester modified epoxy back paint, a preparation method thereof, an environment-friendly household appliance color coated plate with excellent foaming performance and a production method thereof, and the paint with excellent performance, particularly superior foaming performance, is obtained by adopting polyester modified epoxy resin with excellent corrosion resistance. The application publication No. CN 114535036A discloses a high corrosion resistance deep-drawing color coated plate for outdoor household appliances and a preparation method thereof, and adopts special polyurethane primer to improve the notch corrosion resistance and deep-drawing service performance of the color coated plate. The application publication No. CN 114539854A discloses a color-coated plate with high corrosion resistance and a production method thereof, and the color-coated plate with excellent bonding force between various layers and high corrosion resistance is obtained through the double-sided ultra-thick fluorocarbon surface quality control technology, including the formula components of primer and finish paint, the coating and curing process designs of roller speed, roller pressure and the like. In summary, a great deal of silk screen technology for color coated plates has been disclosed, but with the continuous development of technical routes and the improvement of different performance requirements of the market on product quality, the curing process for color coated plates in industry is still under continuous research and development.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to provide a curing process of a color-coated sheet of a functional household appliance, which is used for producing a material suitable for high-end household appliances by adjusting the components of the color-coated finish paint and optimizing the curing process, and meets the requirement of good adhesion between a subsequent cured coating and the color-coated sheet body under the ultraviolet light condition.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a curing process of a color-coated sheet of a functional household appliance, which comprises the following production processes:
s1, preparing a substrate: the steel plate is hot rolled, acid washed, cold rolled and hot dip plated to form a plated steel strip with qualified surface quality and plate shape, namely a galvanized base plate;
cleaning a substrate: alkali washing and rinsing are carried out on the substrate to remove impurities and greasy dirt on the surface of the steel belt;
passivation of the substrate: coating a passivation film with a film weight of 0-15mg/m on the surface of the clean substrate 2 Enhancing the adhesion between the plating plate and the coating;
s2, coating a baking primer and a finishing paint, wherein the thickness of the primer is 5-7 microns, the thickness of the finishing paint is 15-17 microns, coating the finishing paint after the primer is dried, and coiling the finishing paint into a coil after the finishing paint is dried;
the invention controls the furnace temperature T of baking finish paint Furnace with a heat exchanger Controlled to T Furnace with a heat exchanger ＝250+10(H Base group + ㏑ V-6R); wherein H is Base group Refers to the thickness of the substrate, mm; v refers to the running speed of a baking furnace production line, m/min; r refers to the surface roughness of the color-coated plate. Further, the furnace temperature T for baking the finish paint Furnace with a heat exchanger Preferably 230-270 ℃, and the thickness H of the substrate Base group Preferably 0.3mm-0.6mm, the running speed V of the production line is preferably 40m/min-80m/min, and the roughness R of the color coating surface is preferably 0.5-1.0.
In order to achieve the effect of ultraviolet curing of the coating and not to influence the other properties of the color-coated plates of the household appliances, the invention has the advantages that the control of the furnace temperature of the curing furnace is particularly important when the surface paint is baked, not only is partial incomplete curing of active factors reserved, but also the crosslinking reaction with molecules in the ultraviolet curing coating is facilitated, and meanwhile, the surface paint components are adjusted, so that the surface paint components are matched with the furnace temperature of the curing furnace, and the adverse effects of incomplete curing of the conventional surface paint on MEK, T-bend resistance, corrosion resistance and the like of the color-coated plates of the household appliances are avoided.
The top-coat paint used in the invention comprises the following components: 50-60 parts of unsaturated polyester resin; 15-25 parts of pigment and filler; 5-10 parts of dispersing agent; 4-8 parts of a defoaming agent; 15-20 parts of dimethylbenzene; 10-15 parts of styrene; 0.5-1.0 part of surface auxiliary agent; 0.2-0.6 part of leveling agent.
Wherein the unsaturated polyester resin is prepared by the following method: 15mL-20mL of maleic anhydride, 5mL-10mL of phthalic anhydride, 10mL-15mL of 1, 2-propylene glycol and 1-2g of organotin are taken and added into a reaction vessel, a stirrer, a thermometer and a constant pressure dropping funnel are correspondingly arranged in the reaction vessel, and in order to avoid oxidation of materials, the reaction is carried out under the protection of inert gas of nitrogen, and the reaction vessel is stirred and preheated to 120-130 ℃; adding 15-25g of trimethylolpropane diallyl ether, dripping at a constant speed by adopting a constant pressure dropping funnel, finishing dripping within 0.5-1.0h, and then reacting at a constant temperature of 150-170 ℃; the proper and sufficient dripping reaction time is beneficial to improving the molecular weight of the polycondensate and avoiding the problem that too few molecular active sites affect the reaction with the subsequent printing ink due to too long time; transferring the system to a high-pressure reaction kettle with the pressure of 15-20 MPa at the later stage, and performing constant-temperature reaction at the vacuum state at 120-140 ℃ to ensure that low-molecular byproducts are removed and avoid influencing the yield; and (3) measuring the acid value of the reaction liquid at intervals, cooling to 70-90 ℃ after the acid value is reduced to 30-40mgKOH/g, sampling to measure the molecular weight, stopping heat preservation after the molecular weight reaches 7000-15000, rapidly cooling, filtering and discharging to obtain the unsaturated polyester.
The unsaturated polyester in the invention contains a certain amount of unsaturated bonds with great activity on the molecular chain, and can react with the active sites of the ink. In order to enable unsaturated bonds to react with components in the ink to form a film under certain conditions, ultraviolet light with certain intensity is required to be matched for triggering, and the linear thermosetting resin can be changed into a polymer with a non-melting structure under the condition of heating. Meanwhile, the unsaturated bonds of the unsaturated polyester are too many, self-condensation is easy to occur, when the molecular weight is lower than 7000 lower limit, the mechanical strength of the unsaturated polyester can be greatly reduced, and one of the key properties of the color-coated plates of the household appliance, namely the processing deformation resistance, is influenced; if the unsaturated bonds of the unsaturated polyester are too small, the subsequent reaction degree with the ink is affected, and poor adhesive force of the ink is easily caused.
S3, printing ink screen printing: cutting color-coated coil steel into box plates, allowing the box plates to pass under an ultraviolet curing lamp at constant speed, curing to form film, running at line speed of 30-50m/min, and curing energy of 500mJ/cm 2 -700mJ/cm 2 And (5) after cooling to room temperature, detecting various performances.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
according to the curing process, the furnace temperature of the curing furnace is optimally controlled when the finish paint is baked, partial incomplete curing of active factors is reserved, cross-linking reaction with molecules in the ultraviolet curing coating is facilitated, and meanwhile, the finish paint components are adjusted to be matched with the furnace temperature of the curing furnace, so that adverse effects of incomplete curing of conventional finish paint on MEK (methyl ethyl ketone), T-bend resistance, corrosion resistance and the like of a household appliance color coating plate are avoided, and good adhesion between the subsequent curing coating and the color coating plate body under the ultraviolet light condition is met.
Drawings
FIG. 1 is a graph showing the comparison of the falling off rates of UV-cured coatings of examples and comparative examples;
FIG. 2 is a schematic diagram of the comparison of MEK resistance of each example with that of the comparative example;
FIG. 3 is a schematic diagram of the comparison of the T-bends of the examples and comparative examples;
FIG. 4 is a schematic diagram showing the comparison of the etching widths of the neutral salt spray score lines of each example and comparative example 500 h;
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention is further described below with reference to examples.
Examples
The curing process of the color-coated sheet of the functional household appliance comprises the following production processes:
s1, preparing, cleaning and passivating a substrate: passivation film with weight of 0-15mg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The weights of the membranes in examples 1 to 3 below were 2mg/m, respectively 2 ，10mg/m 2 And 15mg/m 2 ；
S2, coating baking primer and finishing paint, and controlling the furnace temperature T of finishing paint baking Furnace with a heat exchanger Controlled to T Furnace with a heat exchanger ＝250+10(H Base group + ㏑ V-6R); wherein H is Base group Refers to the thickness of the substrate, mm; v refers to the running speed of a baking furnace production line, m/min; r refers to the surface roughness of the color-coated plate; wherein the thickness of the primer is 5-7 microns, the thickness of the top coat is 15-17 microns, the thickness of the primer in the following examples 1-3 is 5um, 6um and 7um respectively, and the thickness of the top coat is 15um, 16um and 17um.
S3, printing ink screen printing: cutting color-coated coil steel into box plates, allowing the box plates to pass under an ultraviolet curing lamp at constant speed, curing to form film, running at line speed of 30-50m/min, and curing energy of 500mJ/cm 2 -700mJ/cm 2 The line speeds in examples 1 to 3 were 30m/min, 40m/min and 50m/min, respectively, and the curing energies were 500mJ/cm, respectively 2 、600mJ/cm 2 、700mJ/cm 2 。
According to the embodiment, the curing process of the household appliance color coated plate suitable for ultraviolet curing is produced through adjustment of the formula of the finish paint coating and matching of production process parameters, and in the aspect of design of the formula of the finish paint coating, in order to ensure that the rest performances of the household appliance color coated plate are not affected, the process suitable for subsequent ultraviolet curing is also realized, unsaturated polyester containing double bonds, hydroxyl and carboxyl which can be reacted only under certain ultraviolet energy is adopted, the requirement of subsequent ultraviolet curing re-crosslinking reaction is met, and active points which can be partially initiated only under specific conditions are reserved.
The production information of each component product of the top coat paint in this example is shown in table 1 below:
table 1: information table for top coat component
| Material for material | Model number | Manufacturer' s |
| Unsaturated polyester resin | Homemade | / |
| Pigment and filler | Titanium white powder | Anhui gold star titanium white |
| Dispersing agent | BYK-190 | Pick chemistry |
| Defoaming agent | JS-205 | Quick-acting wintering chemical |
| Surface auxiliary agent | TEGOLTW | German Digao |
| Leveling agent | Perenol F40 | Basoff' s |
| Xylene (P) | / | Group of Chinese medicine |
| Styrene | / | Group of Chinese medicine |
The following table 2 shows the specific components of the top coats and the curing baking temperature information table of the top coats in each example and comparative example:
table 2: topcoat ratio and baking information table
The following table 3 is a table of the preparation components and preparation process information of the unsaturated polyester resins in each example:
table 3: preparation process information table of unsaturated polyester resin
| Project | Example 1 | Example 2 | Example 3 |
| Maleic anhydride (mL) | 15 | 16 | 20 |
| Phthalic anhydride (mL) | 5 | 10 | 7 |
| 1, 2-propanediol (mL) | 13 | 15 | 10 |
| Organotin (g) | 1 | 1.6 | 2 |
| Trimethylolpropane diallyl ether (g) | 18 | 25 | 15 |
| Stirring preheating temperature (DEG C) | 120 | 130 | 125 |
| Constant temperature reaction temperature (. Degree. C.) | 150 | 160 | 170 |
| High pressure reactor pressure (MPa) | 15 | 18 | 20 |
| Reaction temperature (DEG C) of high-pressure reaction kettle | 140 | 120 | 130 |
| Acid value detection (mgKOH/g) | 30 | 36 | 40 |
| Temperature lowering (DEG C) | 70 | 80 | 90 |
The following table 4 is a table of the detection performance information of the products obtained in each of the examples and comparative examples:
table 4: product performance information table
| Performance of | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Shedding rate of ultraviolet cured |
0 | 0 | 0 | 30％ | 20％ | 50％ | 40％ | 22 |
| MEK | ||||||||
| 100 | 100 | 100 | 80 | 70 | 50 | 100 | 100 | |
| T- |
1 | 1 | 1 | 2 | 3 | 4 | 1 | 2 |
| 500h of salt fog scribing width, mm | 1.8 | 1.5 | 1.6 | 3 | 4 | 7 | 4.2 | 2 |
The invention and its embodiments have been described above by way of illustration and not limitation, but rather one of the embodiments of the invention is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (10)
1. A curing process of a functional household appliance color-coated plate is characterized by comprising the following steps of: the production flow is as follows:
s1, preparing, cleaning and passivating a substrate;
s2, coating baking primer and finishing paint, wherein the thickness of the primer is 5-7 microns, the thickness of the finishing paint is 15-17 microns, and coiling the dried coating into a coil;
s3, printing ink screen printing: and (3) cutting the color-coated coiled steel, and then enabling the color-coated coiled steel to pass below an ultraviolet curing lamp at a constant speed to be cured into a film.
2. The curing process of the color-coated sheet for functional home appliances according to claim 1, wherein the curing process comprises the following steps: the preparation of the substrate in S1 refers to: hot rolling, pickling, cold rolling and hot dip plating are carried out on the steel plate to prepare a coated steel belt with qualified quality;
the cleaning of the substrate means: alkali washing and rinsing are carried out on the substrate to remove impurities and greasy dirt on the surface of the steel belt;
passivation of the substrate refers to: coating a passivation film with a film weight of 0-15mg/m on the surface of the clean substrate 2 。
3. The curing process of the color-coated sheet for functional home appliances according to claim 1, wherein the curing process comprises the following steps: s2, after finishing paint is coated, baking furnace temperature T of finishing paint Furnace with a heat exchanger Controlled to T Furnace with a heat exchanger ＝250+10(H Base group + ㏑ V-6R); wherein H is Base group Refers to the thickness of the substrate, mm; v refers to the running speed of a baking furnace production line, m/min; r refers to the surface roughness of the color-coated plate.
4. The curing process of the color coated sheet for functional home appliances according to claim 3, wherein the curing process comprises the following steps: furnace temperature T for baking finish paint Furnace with a heat exchanger 230-270 ℃.
5. The curing process of the color coated sheet for functional home appliances according to claim 3, wherein the curing process comprises the following steps: substrate thickness H Base group Preferably 0.3mm to 0.6mm, and the line running speed V is preferably 40m/miThe surface roughness R of the color coating is preferably 0.5-1.0 in n-80 m/min.
6. The curing process of the color coated sheet for functional home appliances according to claim 3, wherein the curing process comprises the following steps: the top-coat paint used in S2 comprises the following components: 50-60 parts of unsaturated polyester resin; 15-25 parts of pigment and filler; 5-10 parts of dispersing agent; 4-8 parts of a defoaming agent; 15-20 parts of dimethylbenzene; 10-15 parts of styrene; 0.5-1.0 part of surface auxiliary agent; 0.2-0.6 part of leveling agent.
7. The curing process of the color coated sheet for functional home appliances according to claim 6, wherein the curing process comprises the following steps: the unsaturated polyester resin in the finish paint is prepared by the following method: 15mL-20mL of maleic anhydride, 5mL-10mL of phthalic anhydride, 10mL-15mL of 1, 2-propanediol and 1-2g of organotin are added into a reaction vessel, and stirring and preheating are carried out to 120-130 ℃ under the protection of nitrogen; adding 15-25g of trimethylolpropane diallyl ether, and reacting at a constant temperature of 150-170 ℃; transferring the system into a high-pressure reaction kettle, reacting at the constant temperature of 120-140 ℃, cooling to 70-90 ℃ after the acid value is reduced to 30-40mgKOH/g, stopping heat preservation after the molecular weight is 7000-15000, rapidly cooling, filtering and discharging to obtain the unsaturated polyester.
8. The curing process of the color coated sheet for functional home appliances according to claim 7, wherein the curing process comprises the following steps: and (3) uniformly dripping the trimethylolpropane diallyl ether by adopting a constant pressure dropping funnel, and finishing the dripping within 0.5-1.0 h.
9. The curing process of the color coated sheet for functional home appliances according to claim 7, wherein the curing process comprises the following steps: the pressure in the high-pressure reaction kettle is 15MPa-20MPa.
10. The curing process of the color-coated sheet for functional home appliances according to any one of claims 1 to 9, wherein: the running line speed in the printing of the ink screen in the S3 is 30-50m/min, and the curing energy is 500mJ/cm 2 -700mJ/cm 2 。
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