CN114226209B - Water-based household electrical appliance color steel primer-topcoat coating method - Google Patents
Water-based household electrical appliance color steel primer-topcoat coating method Download PDFInfo
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- CN114226209B CN114226209B CN202111626399.0A CN202111626399A CN114226209B CN 114226209 B CN114226209 B CN 114226209B CN 202111626399 A CN202111626399 A CN 202111626399A CN 114226209 B CN114226209 B CN 114226209B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 235
- 239000010959 steel Substances 0.000 title claims abstract description 235
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000007761 roller coating Methods 0.000 claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000003973 paint Substances 0.000 claims description 126
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000012459 cleaning agent Substances 0.000 claims description 17
- 239000013527 degreasing agent Substances 0.000 claims description 17
- 238000005237 degreasing agent Methods 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 239000003085 diluting agent Substances 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 229920003180 amino resin Polymers 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 6
- 239000012948 isocyanate Substances 0.000 description 6
- 150000002513 isocyanates Chemical class 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 238000010422 painting Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009500 colour coating Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- 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
- 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
- B05D3/04—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 gases
- B05D3/0406—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 gases the gas being air
- B05D3/0426—Cooling with air
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
Abstract
The application relates to the technical field of coating, and discloses a water-based household appliance color steel bottom surface integrated coating method, which comprises the following steps: pretreating a steel plate to be sprayed, and preparing raw materials and tools; preparing a small amount of coating, detecting the viscosity of the prepared coating, preparing a large amount of coating after the viscosity of the prepared coating is proper, filtering, placing the prepared coating in a roller coater, and uniformly transferring the coating onto a steel plate by the roller coater; the steel plate after roller coating is put into an oven for baking; and taking out the baked steel plate, naturally cooling the color steel plate, and finishing the spraying work of the steel plate. The method for coating the water-based color steel and the primer on the bottom surface of the household appliance omits the step of spraying the primer on the surface of the steel plate, and the steel plate only needs to be subjected to the processing step of one coating and one baking.
Description
Technical Field
The application relates to the technical field of coating, in particular to a coating method for a color steel bottom surface of an aqueous household appliance.
Background
The color steel is a color-coated steel plate, which is a steel plate with an organic coating, has the characteristics of good corrosion resistance, bright color, attractive appearance, convenient processing and forming, original strength of the steel plate, low cost and the like, is also called a household appliance plate, can meet the requirements of the use environment and service life of household appliances, has good molding processability, can meet the requirements of high-speed and precise processing equipment, and can be used for decorating household appliances such as refrigerator side plates, back plates, washing machine boxes, outer barrels of water heaters, microwave oven shells and the like in batches. Besides common color products, the products with the color of beads and metal become popular trends of household appliance shells, such as silver variable-frequency refrigerators, full-frequency space king refrigerators and network household appliance shells all adopt household appliance color steel plates.
In the production process of household electrical appliance color steel, the steel plate basically needs to be sprayed and baked twice, which is not environment-friendly, and the painting and baking process of the color-coated plate is equivalent to the accelerated aging process, and for general low-carbon aluminum killed steel, the mechanical properties of the steel plate before and after baking are obviously changed, and the concrete characteristics are that the yield strength is obviously increased, the yield extension is obviously increased and the elongation is reduced. The method is characterized in that after painting, C, N interstitial atoms in steel are diffused and gathered around edge dislocation to form a koff gas group to lock dislocation, when deformation is carried out, the dislocation can be free from the gas group or generate new dislocation, and sliding movement is started, so that the upper yield is obviously increased, the upper and lower yield difference is obviously increased, when the color plate with high yield extension value is processed and molded, IF the deformation rate is high or the uneven deformation is serious, defects such as ridging and fold are generated, and in order to improve the time-resisting performance of the color plate, the method of aging-free IF steel substrate, aging-resisting color plate or post-color-coating withdrawal and straightening is generally adopted at present, but the IF steel color plate is aging-free, the cost is high, the post-color-coating withdrawal and straightening method is easy to generate irregular ripple defects, the glossiness and the surface appearance of the color-coated steel plate are influenced, and the requirements of household appliances with high surface quality requirements cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a method for coating the color steel bottom surface of the water-based household appliance by adopting a one-coating one-baking method, which has the advantages of directly coating the paint on the surface of the color steel plate, saving energy, protecting environment, improving the time-resisting performance of the color steel plate and the like, and solves the problems in the prior art.
The application provides the following technical scheme: a method for coating a water-based color steel primer-topcoat paint for household appliances comprises the following steps:
step one: pretreating a steel plate to be sprayed, and preparing water-based household electrical appliance color steel bottom surface integrated paint, a paint thinner, a paint placing container and a paint stirring tool;
step two: placing a proper amount of water-based household electrical appliance color steel primer-topcoat material into a paint placing container, adding a proper amount of paint diluent into the paint placing container, and uniformly mixing the water-based household electrical appliance color steel primer-topcoat material and the paint diluent in the paint placing container by using a paint stirring tool;
step three: placing the uniformly mixed and diluted coating in a feeding device of a color steel plate roller coater, starting the roller coater, and uniformly transferring the uniformly mixed and diluted coating to a pretreated steel plate to be sprayed through the roller coater;
step four: the steel plate after roller coating is put into an oven for baking;
step five: and taking out the baked steel plate, naturally cooling the steel plate, and finishing the spraying work.
Preferably, the paint diluent in the first step is deionized water, and the ratio of the water-based household electrical appliance color steel primer-topcoat paint to the paint diluent is 1: (0-5%), and the paint thinner and the water-based household electrical appliance color steel primer-topcoat paint are mixed according to the principle of a small amount of times, wherein the paint placing container is made of a material which does not react with water or the inner wall of the paint placing container is coated with a coating which does not react with water.
Preferably, the method for pretreating the steel plate to be sprayed in the first step comprises the following steps: the method comprises the steps of sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities adhered to the surface of the steel plate, taking the steel plate out of the degreasing agent and the cleaning agent, cleaning the steel plate with deionized water, and drying residual water stains on the surface of the steel plate after removing the impurities by using a blower.
Preferably, in the third step, before the paint after being uniformly mixed and diluted is placed in a feeding device of a color steel plate roller coater, the paint after being uniformly mixed and diluted is subjected to paint viscosity test, is filtered by a 300-mesh filter screen, is uniformly mixed again before being used, and is inspected in terms of PH value.
Preferably, the coating viscosity is calibrated to 60-90 seconds (coating-4 cup/25 degrees Celsius); the pH of the paint is 7.0-8.0.
Preferably, the line speed of the roller coater in the third step is 60-100 m/min, and the wet film thickness of the surface of the steel plate is 16-30 mu m.
Preferably, the baking time of the baking oven in the fourth step is 20-35 seconds, the temperature in the baking oven is 180-350 ℃, and the temperature of the steel plate is 216-232 ℃.
Preferably, the dry film thickness of the surface of the steel plate in the fifth step is 12-20 μm.
Preferably, the oven comprises: the device comprises a box body, a transmission device, a central control device, a timing device, a heating device, a thermal circulation device and an upper computer device; the transmission device is connected to the bottom of the box body in a sliding way, the heating device is arranged at the top of the box body, the thermal circulation device is arranged around the heating device, the central control device is connected, and the central control device is also connected with the timing device and the upper computer device;
when the roller-coated steel plate is baked through the oven, baking time and baking temperature are obtained through the upper computer device, the obtained baking time and baking temperature are transmitted to the central control device, the central control device controls the transmission device to slide out of the box body, so that an operator automatically slides in the box body after placing the roller-coated steel plate on the transmission device, the central control device controls the transmission device to slide out of the box body, the heating device to heat according to the baking temperature, the thermal circulation device is also opened, the timing device is controlled to count time according to the baking time when the box body closes the box door, and a timing completion signal is transmitted to the central control device after the timing device counts time, the central control device stops heating by the heating device according to the timing completion signal, and simultaneously closes the thermal circulation device, and controls the transmission device to move the baked steel plate out of the box body when the box door is opened.
Preferably, the step five is that the steel plate is placed on a cooling table after being taken out and baked, so that the steel plate is naturally cooled, the cooling table comprises a cooling table main body, grooves are formed in the bearing surface of the cooling table main body according to fixed intervals, a temperature sensing device is arranged on the bearing surface, the temperature sensing device is connected with a control center, and the control center is also connected with a display device and a reminding device;
when the baked steel plate is placed on the cooling table main body for natural cooling, the control center controls the display device to display a character of cooling, meanwhile, the temperature sensing device is used for obtaining surface temperature information of the baked steel plate and gas temperature information of ventilation air in the groove in real time, the obtained surface temperature information of the baked steel plate and the gas temperature information of ventilation air in the groove are transmitted to the control center, the control center analyzes the surface temperature information and the gas temperature information to determine whether the surface temperature information and the gas temperature information are consistent, and when the surface temperature information and the gas temperature information are consistent, the reminding device is controlled to complete cooling reminding after a certain time, and the character of cooling displayed by the display device is changed into a character of cooling completion to be displayed.
Compared with the prior art, the application has the following beneficial effects:
1. the method for coating the water-based color steel and the primer on the bottom surface of the household appliance omits the step of spraying the primer on the surface of the steel plate, and the steel plate only needs to be subjected to the processing step of one coating and one baking.
2. According to the coating method of the water-based household electrical appliance color steel primer-topcoat, the water-based household electrical appliance color steel primer-topcoat can be directly coated on the surface of a steel plate through selection of the water-based household electrical appliance color steel primer-topcoat, low organic volatile compounds (VOC) and low odor can be generated in the coating process of the water-based household electrical appliance color steel primer-topcoat, compared with the powder coating, the water-based household electrical appliance color steel primer-topcoat is more environment-friendly, the existing construction process does not need to be changed when the water-based household electrical appliance color steel primer-topcoat is used, the cost of equipment transformation is reduced, and the thickness of the coating can be effectively controlled.
Drawings
FIG. 1 is a schematic diagram showing the detection of the concentration of organic volatile matters in the production process of the present application;
FIG. 2 is a schematic diagram showing the comparison of the production energy consumption of the present application with the conventional process.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1 to 2, a method for coating a color steel floor of an aqueous household appliance with a paint comprises the following steps:
step one: the method for preprocessing the steel plate to be sprayed comprises the following steps: sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing wax, greasy dirt, dust and other impurities adhered to the surface of the steel plate, cleaning the steel plate by deionized water when the steel plate is taken out from the degreasing agent and the cleaning agent, drying residual water stains on the surface of the steel plate by a blower after the impurities are removed, and preparing a water-based household electrical appliance color steel bottom surface integrated coating, a coating diluent, a coating placing container and a coating stirring tool;
step two: placing a proper amount of water-based household electrical appliance color steel primer-topcoat in a paint placing container, wherein the ratio of the water-based household electrical appliance color steel primer-topcoat to a paint thinner is 1: (0-5%), adding a proper amount of paint diluent into the container, wherein the paint diluent is deionized water, and when the paint diluent is mixed with the water-based household appliance color steel primer-topcoat paint, the paint and the diluent in the paint placing container are uniformly mixed by using a paint stirring tool, and the paint placing container is made of stainless steel, plastic and the like which do not react with water or is subjected to proper internal coating treatment, so that the paint and the organic solvent are strictly forbidden to be mixed to prevent deterioration;
step three: testing the evenly mixed paint, namely testing the viscosity of the paint, wherein the viscosity of the qualified paint is 60-90 seconds (coating-4 cup/25 ℃), after the paint is qualified in viscosity test, evenly mixing a large amount of paint with paint diluent, wherein the PH value of the paint is 7.0-8.0, filtering the evenly mixed diluted paint by using a 300-mesh filter screen, placing the evenly mixed diluted paint in a feeding device of a color steel plate roller coater, starting the roller coater, wherein the linear speed of the roller coater is 60-100 m/min, evenly transferring the paint onto a steel plate by the roller coater, and the wet film thickness of the surface of the steel plate is 16-30 mu m;
step four: the color steel plate after roller coating is put into an oven for baking, the baking time of the oven is 20-35 seconds, the temperature in the oven is 180-350 ℃, and the greenhouse of the steel plate is 216-232 ℃;
step five: and taking out the baked steel plate, naturally cooling the steel plate, and finishing spraying the color steel plate, wherein the dry film thickness of the surface of the steel plate is 12-20 mu m.
And in the first step, air is blown into a container for containing the degreasing agent and the cleaning agent when the steel plate is pretreated, so that the contact frequency of the solvent and the steel plate is quickened, and the cleaning efficiency of the steel plate is improved.
In step four, the oven includes: the device comprises a box body, a transmission device, a central control device, a timing device, a heating device, a thermal circulation device and an upper computer device; the transmission device is connected to the bottom of the box body in a sliding way, the heating device is arranged at the top of the box body, the thermal circulation device is arranged around the heating device, the central control device is connected, and the central control device is also connected with the timing device and the upper computer device; when the steel plate after roller coating is baked through the oven, obtain baking time and baking temperature through upper computer device, and transmit the baking time and the baking temperature who will obtain to well accuse device, well accuse device control transmission device rolls off the box, make the operating personnel put the steel plate after the roller coating on the transmission device in the automatic roll-in box, especially, be equipped with the inductor on the transmission device, when the inductor senses the steel plate after the roller coating and put on the transmission device and when not changing in the default time, transmit the signal to well accuse device, make well accuse device control transmission device automatic slip in box, well accuse device still controls heating device and heats according to baking temperature when controlling transmission device roll-off box, and still open thermal cycle device simultaneously, and control timing device is timed according to baking time when the box closes the chamber door, and to well accuse device transmission timing completion signal after timing device timing is accomplished, well accuse device stops heating device heating according to timing completion signal, and when the chamber door is opened, control transmission device shifts out the steel plate after baking from the box. The timing device is controlled to time according to the baking time when the box body closes the box door, so that the steel plate after roller coating can be effectively baked in the baking time, the shortage of effective baking time is avoided, the heat which is diffused out by the heating device can be diffused out by the heat circulating device which is arranged around the heating device, the temperature in the box body is quickly balanced, the steel plate after roller coating is heated uniformly, the baking efficiency and baking quality of the steel plate after roller coating are improved, the steel plate after roller coating is slidingly connected at the bottom of the box body to enter the box body or move out of the box body after roller coating through sliding, manual placement of workers or the taking out of the steel plate after roller coating can be effectively avoided, labor is saved, the burden of workers is reduced, the workers can be prevented from contacting the box body, high-temperature burns are avoided, and the safety guarantee is improved.
Step five, placing the baked steel plate on a cooling table to cool the steel plate naturally, wherein the cooling table comprises a cooling table main body, grooves are formed in the bearing surface of the cooling table main body according to fixed intervals, a temperature sensing device is arranged on the bearing surface, the temperature sensing device is connected with a control center, and the control center is also connected with a display device and a reminding device; when the baked steel plate is placed on the cooling table main body for natural cooling, the control center controls the display device to display a character of cooling, meanwhile, surface temperature information of the baked steel plate and gas temperature information of ventilation air in the groove are obtained in real time through the temperature sensing device, the obtained surface temperature information of the baked steel plate and the obtained gas temperature information of ventilation air in the groove are transmitted to the control center, the control center analyzes the surface temperature information and the gas temperature information to determine whether the surface temperature information and the gas temperature information are consistent, and when the surface temperature information and the gas temperature information are consistent, the control reminding device is controlled to finish cooling after a certain time, and the character of cooling displayed by the display device is changed into a character of cooling completion to be displayed. The bearing surface through the cooling table main part is equipped with the recess according to fixed interval and can enlarge the area of contact of steel sheet after toasting and air for natural cooling's efficiency, be equipped with temperature sensing device in bearing surface moreover and can acquire the surface temperature information of steel sheet after toasting and the gas temperature information of ventilation air in the recess simultaneously according to unsmooth partial contact condition, can know to the steel sheet after toasting through display device's natural cooling condition, need not to go to detect and judge, not only convenient, but also can not cause the injury to the staff, and only carry out a sound when accomplishing the warning through reminding device cooling with ease, not only can remind the staff, still can not cause adverse effect to the staff, wherein when the surface temperature information and gas temperature information are unanimous, control reminding device carries out the cooling after certain time of interval and accomplish the warning, the certain time of interval is confirmed through following formula:
in the above formula, t represents the interval time, c represents the specific heat capacity of the baked steel sheet, m represents the length of the baked steel sheet, n represents the width of the baked steel sheet, d represents the thickness of the baked steel sheet, W represents the initial gas temperature information, and W i The initial surface temperature information acquired by the temperature sensing device on the ith convex part of the bearing surface, which is in contact with the baked steel plate, is represented by N, the number of convex parts of the bearing surface, which are in effective contact with the baked steel plate, mu, the blending parameter and v, the average heat dissipation rate of the baked steel plate in the air.
The steel plate after baking is completely cooled through a certain time interval, the quality of the water-based household electrical appliance color steel cannot be guaranteed completely due to the fact that the cooling inside the steel plate is not completely cooled is avoided, the quality of the water-based household electrical appliance color steel is improved, the certain time interval is determined according to the steel plate after baking, the inside of the steel plate after baking can be completely cooled through a certain time interval, the temperature difference obtained by the temperature sensing device on the protruding portion of the bearing surface is also considered, natural cooling is enabled to be more thorough, and meanwhile more time is not wasted.
Example 1: sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities such as wax, greasy dirt and dust adhered to the surface of the steel plate, cleaning the steel plate by deionized water when the steel plate is taken out from the degreasing agent and the cleaning agent, and drying residual water stains on the surface of the steel plate by a blower after the impurities are removed; a small amount of water-based household electrical appliance color steel primer-topcoat material and a paint thinner are selected and mixed uniformly, and the ratio of the water-based household electrical appliance color steel primer-topcoat material to the paint thinner is 1: (0-5%) and detecting the viscosity and PH value of the evenly mixed paint, wherein the adhesion of the paint is 60-90 seconds (coating-4 cup/25 ℃) and the PH value is 7.0-8.0, a user prepares a large amount of evenly mixed diluted paint according to the proportion, filters the paint by using a 300-mesh filter screen, places the filtered paint in a roller coater, starts the roller coater, the rotating speed of the roller coater is 60 m/min, the roller coater coats the paint on a steel plate, the thickness of a wet film on the steel plate is 16 mu m, places the steel plate after roller coating in a preheated oven, the temperature in the oven is 180 ℃, the steel plate is baked for 20 seconds, takes out the baked steel plate, naturally cools the steel plate to room temperature, and the thickness of a dry film on the steel plate is 12 mu m.
Example 2: sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities such as wax, greasy dirt and dust adhered to the surface of the steel plate, cleaning the steel plate by deionized water when the steel plate is taken out from the degreasing agent and the cleaning agent, and drying residual water stains on the surface of the steel plate by a blower after the impurities are removed; a small amount of water-based household electrical appliance color steel primer-topcoat material and a paint thinner are selected and mixed uniformly, and the ratio of the water-based household electrical appliance color steel primer-topcoat material to the paint thinner is 1: (0-5%) and detecting the viscosity and PH value of the evenly mixed paint, wherein the adhesion of the paint is 60-90 seconds (coating-4 cup/25 ℃) and the PH value is 7.0-8.0, a user prepares a large amount of evenly mixed diluted paint according to the proportion, filters the paint by using a 300-mesh filter screen, the filtered paint is placed in a roller coater, the roller coater is started, the rotating speed of the roller coater is 70 m/min, the paint is coated on a steel plate, the thickness of a wet film on the steel plate is 17 mu m, the steel plate after roller coating is placed in a preheated oven, the temperature in the oven is 190 ℃, the steel plate is baked for 21 seconds, the baked steel plate is taken out and naturally cooled to room temperature, and the thickness of a dry film on the steel plate is 13 mu m.
Example 3: sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities such as wax, greasy dirt and dust adhered to the surface of the steel plate, cleaning the steel plate by deionized water when the steel plate is taken out from the degreasing agent and the cleaning agent, and drying residual water stains on the surface of the steel plate by a blower after the impurities are removed; a small amount of water-based household electrical appliance color steel primer-topcoat material and a paint thinner are selected and mixed uniformly, and the ratio of the water-based household electrical appliance color steel primer-topcoat material to the paint thinner is 1: (0-5%) and detecting the viscosity and PH value of the evenly mixed paint, wherein the adhesion of the paint is 60-90 seconds (coating-4 cup/25 ℃) and the PH value is 7.0-8.0, a user prepares a large amount of evenly mixed diluted paint according to the proportion, filters the paint by using a 300-mesh filter screen, the filtered paint is placed in a roller coater, the roller coater is started, the rotating speed of the roller coater is 80 m/min, the paint is coated on a steel plate, the thickness of a wet film on the steel plate is 18 mu m, the steel plate after roller coating is placed in a preheated oven, the temperature in the oven is 200 ℃, the steel plate is baked for 22 seconds, the baked steel plate is taken out and naturally cooled to room temperature, and the thickness of a dry film on the steel plate is 14 mu m.
Example 4: sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities such as wax, greasy dirt and dust adhered to the surface of the steel plate, cleaning the steel plate by deionized water when the steel plate is taken out from the degreasing agent and the cleaning agent, and drying residual water stains on the surface of the steel plate by a blower after the impurities are removed; a small amount of water-based household electrical appliance color steel primer-topcoat material and a paint thinner are selected and mixed uniformly, and the ratio of the water-based household electrical appliance color steel primer-topcoat material to the paint thinner is 1: (0-5%) and detecting the viscosity and PH value of the evenly mixed paint, when the adhesion of the paint is 60-90 seconds (coating-4 cup/25 ℃) and the PH value is 7.0-8.0, a user prepares a large amount of evenly mixed diluted paint according to the proportion, filters the paint by using a 300-mesh filter screen, places the filtered paint in a roller coater, starts the roller coater, the rotating speed of the roller coater is 90 meters/min, the roller coater coats the paint on a steel plate, the thickness of a wet film on the steel plate is 19 mu m, places the steel plate after the roller coating in a preheated oven, the temperature in the oven is 210 ℃, the steel plate is baked for 23 seconds, takes out the baked steel plate, naturally cools the steel plate to room temperature, and the thickness of a dry film on the steel plate is 15 mu m.
Example 5: sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities such as wax, greasy dirt and dust adhered to the surface of the steel plate, cleaning the steel plate by deionized water when the steel plate is taken out from the degreasing agent and the cleaning agent, and drying residual water stains on the surface of the steel plate by a blower after the impurities are removed; a small amount of water-based household electrical appliance color steel primer-topcoat material and a paint thinner are selected and mixed uniformly, and the ratio of the water-based household electrical appliance color steel primer-topcoat material to the paint thinner is 1: (0-5%) and detecting the viscosity and PH value of the evenly mixed paint, when the adhesion of the paint is 60-90 seconds (coating-4 cup/25 ℃) and the PH value is 7.0-8.0, a user prepares a large amount of evenly mixed diluted paint according to the proportion, filters the paint by using a 300-mesh filter screen, places the filtered paint in a roller coater, starts the roller coater, the rotating speed of the roller coater is 100 m/min, the roller coater coats the paint on a steel plate, the thickness of a wet film on the steel plate is 20 mu m, places the steel plate after the roller coating in a preheated oven, the temperature in the oven is 220 ℃, the steel plate is baked for 23 seconds, takes out the baked steel plate, naturally cools the steel plate to room temperature, and the thickness of a dry film on the steel plate is 16 mu m.
Comparative example 1: the surface of the pretreated steel plate is required to be sprayed with a primer, the primer is dried by a 250 ℃ oven, the surface of the primer is sprayed with a finish paint, the finish paint is dried by a 250 ℃ oven, the primer adopts middle-high molecular polyester, namely a system which adopts linear or small amount of branched chain painting as base resin and amino resin or blocked isocyanate resin as curing agent, the finish paint adopts a polyester system and adopts amino resin or blocked isocyanate resin as curing agent, and the thickness of a paint film is 25 mu m.
Comparative example 2: the surface of the pretreated steel plate is required to be sprayed with a primer, the primer is dried by a 250 ℃ oven, the surface of the primer is sprayed with a finish paint, the finish paint is dried by a 250 ℃ oven, the primer adopts middle-high molecular polyester, namely a system which adopts linear or small amount of branched chain painting as base resin, amino resin or blocked isocyanate resin as curing agent, the finish paint adopts polyester system, amino resin or blocked isocyanate resin is taken as curing agent, and the thickness of a paint film is 28 mu m.
Comparative example 3: the surface of the pretreated steel plate is required to be sprayed with a primer, the primer is dried by a 250 ℃ oven, the surface of the primer is sprayed with a finish paint, the finish paint is dried by a 250 ℃ oven, the primer adopts middle-high molecular polyester, namely a system which adopts linear or small amount of branched chain painting as base resin, amino resin or blocked isocyanate resin as curing agent, the finish paint adopts polyester system, amino resin or blocked isocyanate resin is taken as curing agent, and the thickness of a paint film is 32 mu m.
The electrical components to which the present application relates are all commercially available and all are prior art, and although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for coating a water-based color steel primer-topcoat coating for household appliances is characterized by comprising the following steps: the method comprises the following steps:
step one: pretreating a steel plate to be sprayed, and preparing water-based household electrical appliance color steel bottom surface integrated paint, a paint thinner, a paint placing container and a paint stirring tool;
step two: placing a proper amount of water-based household electrical appliance color steel primer-topcoat material into a paint placing container, adding a proper amount of paint diluent into the paint placing container, and uniformly mixing the water-based household electrical appliance color steel primer-topcoat material and the paint diluent in the paint placing container by using a paint stirring tool;
step three: placing the uniformly mixed and diluted coating in a feeding device of a color steel plate roller coater, starting the roller coater, and uniformly transferring the uniformly mixed and diluted coating to a pretreated steel plate to be sprayed through the roller coater;
step four: the steel plate after roller coating is put into an oven for baking;
step five: taking out the baked steel plate, naturally cooling the steel plate, and finishing spraying work;
step five, placing the baked steel plate on a cooling table to cool the steel plate naturally, wherein the cooling table comprises a cooling table main body, grooves are formed in the bearing surface of the cooling table main body according to fixed intervals, a temperature sensing device is arranged on the bearing surface, the temperature sensing device is connected with a control center, and the control center is also connected with a display device and a reminding device;
when the baked steel plate is placed on the cooling table main body for natural cooling, the control center controls the display device to display a character of cooling, meanwhile, the temperature sensing device is used for acquiring surface temperature information of the baked steel plate and gas temperature information of ventilation air in the groove in real time, the acquired surface temperature information of the baked steel plate and the gas temperature information of ventilation air in the groove are transmitted to the control center, the control center analyzes the surface temperature information and the gas temperature information to determine whether the surface temperature information and the gas temperature information are consistent, and when the surface temperature information and the gas temperature information are consistent, the reminding device is controlled to finish reminding after a certain time, and the character of cooling displayed by the display device is changed into a character of cooling completion to be displayed;
when the surface temperature information and the gas temperature information are consistent, the reminding device is controlled to finish reminding after a certain time interval, and the certain time interval is determined by the following formula:
；
；
in the above-mentioned formula(s),indicates the interval time +.>Represents the specific heat capacity of the baked steel sheet, +.>The length of the steel plate after baking is shown,represents the width of the steel plate after baking, < >>Indicating the thickness of the baked steel sheet, < > and->Indicating the initial gas temperature information, +.>Indicating the first +.>Initial surface temperature information acquired by temperature sensing means on the raised parts +.>Indicating the number of raised parts of the bearing surface in active contact with the baked steel plate, < >>Representing harmonizing parameters->Representing the average heat dissipation rate of the baked steel plate in the air;
the oven includes: the device comprises a box body, a transmission device, a central control device, a timing device, a heating device, a thermal circulation device and an upper computer device; the transmission device is connected to the bottom of the box body in a sliding way, the heating device is arranged at the top of the box body, the thermal circulation device is arranged around the heating device, the central control device is connected with the timing device, and the central control device is also connected with the upper computer device;
when the roller-coated steel plate is baked through the oven, baking time and baking temperature are obtained through the upper computer device, the obtained baking time and baking temperature are transmitted to the central control device, the central control device controls the transmission device to slide out of the box body, so that an operator automatically slides in the box body after placing the roller-coated steel plate on the transmission device, the central control device controls the transmission device to slide out of the box body, the heating device to heat according to the baking temperature, the thermal circulation device is also opened, the timing device is controlled to time according to the baking time when the box body closes the box door, and a timing completion signal is transmitted to the central control device after the timing device finishes timing, the central control device stops heating by the heating device according to the timing completion signal, simultaneously closes the thermal circulation device, and controls the transmission device to move the baked steel plate out of the box body when the box door is opened.
2. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 1, which is characterized in that: the paint diluent in the first step is deionized water, and the ratio of the water-based household electrical appliance color steel primer-topcoat paint to the paint diluent is 1: (0-5%), and the paint thinner and the water-based household electrical appliance color steel primer-topcoat paint are mixed according to the principle of a small amount of times, wherein the paint placing container is made of a material which does not react with water or the inner wall of the paint placing container is coated with a coating which does not react with water.
3. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 1, which is characterized in that: the method for preprocessing the steel plate to be sprayed in the first step comprises the following steps: the method comprises the steps of sequentially placing the steel plate in a container containing a degreasing agent and a cleaning agent, removing impurities adhered to the surface of the steel plate, taking the steel plate out of the degreasing agent and the cleaning agent, cleaning the steel plate with deionized water, and drying residual water stains on the surface of the steel plate after removing the impurities by using a blower.
4. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 1, which is characterized in that: and in the third step, before the paint after being uniformly mixed and diluted is placed in a feeding device of a color steel plate roller coater, the paint after being uniformly mixed and diluted is subjected to paint viscosity test, is filtered by a 300-mesh filter screen, and is uniformly mixed again and is inspected for PH value before being used.
5. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 4, which is characterized in that: the viscosity of the paint is measured by coating 4 cups in 60-90 seconds at 25 ℃; the pH of the paint is 7.0-8.0.
6. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 1, which is characterized in that: the line speed of the roller coater in the third step is 60-100 m/min, and the wet film thickness of the surface of the steel plate is 16-30 mu m.
7. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 1, which is characterized in that: and in the fourth step, the baking time of the oven is 20-35 seconds, the temperature in the oven is 180-350 ℃, and the temperature of the steel plate is 216-232 ℃.
8. The method for coating the water-based color steel primer-topcoat paint for household appliances according to claim 1, which is characterized in that: and in the fifth step, the dry film thickness of the surface of the steel plate is 12-20 mu m.
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| CN111978803A (en) * | 2020-08-27 | 2020-11-24 | 嘉兴睿思达纳米技术有限公司 | Water-based paint coating for stainless steel vacuum cup resistant to washing by dish washer, preparation method and spraying process thereof |
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2021
- 2021-12-28 CN CN202111626399.0A patent/CN114226209B/en active Active
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| JPH09231457A (en) * | 1996-02-26 | 1997-09-05 | Matsushita Refrig Co Ltd | Cooler and heater for automatic vending machine |
| CN101323726A (en) * | 2007-06-13 | 2008-12-17 | 湖南大学 | Steel structure aqueous corrosion resisting paint without need of cleaning rust and preparation thereof |
| CN108036589A (en) * | 2017-11-30 | 2018-05-15 | 江苏镇德电力设备有限公司 | A kind of drying unit |
| CN109251613A (en) * | 2018-08-09 | 2019-01-22 | 深圳华美板材有限公司 | A kind of aqueous PCM steel plate and its manufacturing process |
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