CN114213895B - Process quality control method for water-based household appliance color steel primer coating - Google Patents

Process quality control method for water-based household appliance color steel primer coating Download PDF

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CN114213895B
CN114213895B CN202111503395.3A CN202111503395A CN114213895B CN 114213895 B CN114213895 B CN 114213895B CN 202111503395 A CN202111503395 A CN 202111503395A CN 114213895 B CN114213895 B CN 114213895B
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CN114213895A (en
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刘国民
章小冬
王明辉
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Huizhou Deep Chemical Co ltd
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    • 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
    • C09D7/20—Diluents or solvents
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
    • G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
    • G01B11/0675—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating using interferometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/956—Inspecting patterns on the surface of objects

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Abstract

The invention relates to the technical field of water-based paint, and discloses a process quality control method of water-based household appliance color steel primer paint, which comprises the steps of adding a proper amount of deionized water into the water-based paint for dilution; the water paint is fully and evenly shaken or stirred, and the mixing mass ratio of the water paint is as follows: water removal ion = 1: (0-5%); the water-based paint is fully and evenly shaken or stirred evenly. When the process quality control method of the water-based household appliance color steel primer paint is used, deionized water is used as a dispersion medium, so that the water-based household appliance color steel primer paint is a hard durable primer with a high-temperature baking finish for the surface of a water-based household appliance, has the characteristics of low volatile organic compound content (VOC), low odor, high coverage rate and the like compared with solvent-based color steel plate paint, is a primer with a hard, compact and pollution-resistant paint film, high fullness, excellent adhesive force and leveling property, excellent light-preserving property and color-preserving property, and is suitable for the primer with thicker film thickness requirements (more than 25 um) and needing a double-coating process.

Description

Process quality control method for water-based household appliance color steel primer coating
Technical Field
The invention relates to the technical field of water-based paint, in particular to a process quality control method of water-based household appliance color steel primer paint.
Background
The DEVCRYL technology water-based color steel plate primer is special for roller coating of household appliances, is advanced in technology and excellent in quality, adopts deep Seer synthesized water-based resin and pigment, is matched with functional filler, special auxiliary agents and other environment-friendly materials, and is suitable for metal antirust coating of household appliances, refrigerators, washing machines, air-conditioning steel panels and the like. The high-temperature baking varnish product which is full-functional and does not turn yellow is ideal water-based paint for household appliance plates such as refrigerators, air-conditioning wall machines, washing machines, television panels and the like.
According to the patent number CN201811300120.8, a water-based coating method of powder coating is disclosed, wherein the mass ratio of the powder coating to water is 1 (0.6-1), defoaming agent with the mass fraction of 0.5-3% is added, grinding and stirring are carried out uniformly, the coating is coated on a test board through a coating machine, solidification is carried out at a stepped temperature, cooling is carried out to room temperature, the water-based coating of the powder coating is completed, but the wave mark flatness generated on the surface of the water-based coating when uncured is easy to generate by blowing solidification air flow, the coating effect is influenced, and according to the patent number CN201810928940.5, a water-based coating spraying process and application thereof are disclosed, the water-based coating spraying process comprises spraying primer on the surface of a dried workpiece; performing flash-dry operation on the primer sprayed on the surface of the workpiece; spraying finishing paint on the surface of the workpiece sprayed with the primer; and (3) performing curing operation on the primer and the finish paint sprayed on the workpiece. Wherein the primer and the finish paint are water-based paint; the flash-drying operation temperature is 50-80 ℃, but electrostatic spraying is easy to cause the paint and the surface to be coated to be adhered with dust, the structure of the paint after spraying is influenced, the stability is low, according to the patent number CN96104867.0, 0.7kg of polyvinyl alcohol is added into 8kg of water for heating, filtering is carried out after complete dissolution, film forming auxiliary agents are added, titanium dioxide is added, light calcium powder, talcum powder and the like are ground to obtain finished products, the manufacturing process is simple, but the natural curing efficiency at room temperature is low, the working requirements of the process quality control method of the paint cannot be met, and therefore, the process quality control method of the water-based household electrical appliance color steel primer paint is provided.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a process quality control method of a water-based household appliance color steel primer coating, which solves the technical problems proposed by the background art.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: the process quality control method of the water-based household electrical appliance color steel primer paint specifically comprises the following steps: adding a proper amount of deionized water into the water-based paint for dilution;
the water paint is fully and evenly shaken or stirred, and the mixing mass ratio of the water paint is as follows: water removal ion = 1: (0-5%);
the water paint is fully and evenly shaken or stirred, and a 300-mesh filter screen is used for filtering the water paint;
when the coating is carried out in a laboratory, a wire rod scraping plate, a raw paint scraping plate or a scraping plate after adding 0-5% deionized water for thinning is used, if the coating is carried out, the viscosity of the water-based paint is controlled to be 4 cups/35-60 seconds;
the temperature of the drying line body is 180-350 ℃, the plate temperature is 216-232 ℃, and the drying time is 20-35 seconds.
Preferably, the surface to be coated should be cleaned with a degreasing agent or a cleaning agent before use, and wax, greasy dirt and dust impurities on the surface to be coated are removed.
Preferably, the coating is constructed by adopting a roller coating method when being put on line, a proper amount of water is added for dilution, excessive water is not added, water is used for dilution, acid bias is avoided, the principle that a small amount of water should follow many times when in dilution, and the line speed of the roller coating oil output when being put on line is as follows: 60-100 m/min.
Preferably, the tool and container for the aqueous coating material should be of a material that does not react with water or have a suitable internal coating treatment, and should be tightly mixed with other coating materials and organic solvents to prevent deterioration during construction.
Preferably, the unsealed paint is used up as much as possible within 8 hours, the remaining paint should be stored separately, the pH is maintained at 7.0-8.0 when the paint is reused, and the water paint needs to be tested in advance when the paint is recoated to prevent the interlayer adhesion from being lost.
Preferably, the theoretical coating rate is 390 square meters per um.kg, and the actual coating rate depends on the substrate surface condition.
Preferably, each coating and the final coating are subjected to dry film thickness detection by an electronic dry film thickness meter, and when the film thickness is insufficient, the coating is required to be supplemented to a specified dry film thickness of 5-8 mu m and a wet film of 10-15 mu m.
Preferably, the temperature range of the plate temperature during baking is 216-224 ℃, the temperature range of the plate temperature during baking is 224-232 ℃, the temperature range of the furnace temperature during baking is 30 seconds, the temperature range of the furnace temperature during baking is 180-350 ℃, and the temperature range of the furnace temperature during baking is 25 seconds, and the temperature range of the furnace temperature during baking is 180-350 ℃.
Preferably, before the dry film thickness of each coating layer and the final coating layer is detected by using an electronic dry film thickness meter, the method further comprises:
collecting a first image of the coating layer;
inputting the first image into a first quadrant of a preset coordinate system, and respectively acquiring pixel coordinates corresponding to each pixel point;
respectively obtaining the corresponding color of each pixel point on the first image;
counting the paint colors contained in the first image;
respectively establishing corresponding color layers according to different paint colors, acquiring pixel coordinates corresponding to pixel points with the same paint color, inputting the pixel coordinates into the corresponding color layers, and drawing corresponding color patterns;
detecting pixel overlapping degree of each color pattern and each historical image in the historical image set, extracting overlapping parts of each color pattern and the corresponding historical image to form first pattern contours, and forming a pattern set according to all the first pattern contours;
dividing the first image into a preset number of image columns, respectively counting pattern contours corresponding to each image column, displaying the pattern contours on the second quadrant in a marked mode, and determining the number of complete patterns and the number of incomplete patterns existing in the first image according to a marked display result and a pattern set;
when the number of incomplete patterns is 0, judging whether the number of finished patterns is equal to a preset number;
if not, generating quantity error information, and transmitting the quantity error information to a preset terminal for display;
otherwise, generating pattern defect information, and transmitting the pattern defect information to the preset terminal for display.
Preferably, the coating surface is irradiated by a preset first light;
acquiring a refraction signal in a first incident direction of the preset first light ray irradiating the coating surface;
dividing the refraction signal into an interference waveform and a detection waveform based on the first incidence direction;
acquiring a plurality of detection peaks of the detection waveform, and extracting a maximum peak value from the detection peaks;
acquiring a plurality of interference peaks of the interference waveform;
according to the ratio of the maximum peak value to the average value of the interference peak values, the current thickness of the coating surface is obtained in a preset thickness-ratio list, and whether the current thickness of the coating surface meets a coating standard is judged;
if the detection points do not accord with the detection points, marking a plurality of detection points on the coating surface by using an equidistant method based on the area of the coating surface;
illuminating the coating surface by using a preset second light ray and respectively acquiring an interference spectrum corresponding to each detection point;
respectively acquiring the spectral phase difference of each detection point and the adjacent detection points, and establishing an interference phase matrix by taking the interference spectrum and the spectral phase difference as element coefficients;
respectively obtaining the discrete degree of each column element coefficient on the interference phase matrix, and extracting elements to be detected, wherein the discrete degree is higher than a preset discrete degree;
drawing the spectrum direction corresponding to each element to be detected, removing interference spectrums with consistent spectrum directions, and obtaining a defect element;
and acquiring the position corresponding to each defective element on the interference phase matrix, generating a thickness adjustment area, and transmitting the thickness adjustment area to a preset terminal for display.
(III) beneficial effects
Compared with the prior art, the invention provides a process quality control method of a water-based household appliance color steel primer coating, which has the following beneficial effects:
the process quality control method of the water-based household appliance color steel primer paint is refined by taking deionized water as a dispersion medium and combining advanced micro technology, is a hard and durable primer for coating high-temperature baking paint on water-based household appliances, has the characteristics of low volatile organic compound content (VOC), low odor, high coverage rate and the like compared with solvent-based color steel plate paint, is a primer with a hard, compact and pollution-resistant paint film, high fullness, excellent adhesive force and leveling property, excellent light-storing property and color-storing property, and is suitable for the primer with thicker film thickness requirement (more than 25 um) and needing to be used for a two-coating process.
According to the process quality control method of the water-based household appliance color steel primer coating, the first image of the coating layer is collected, the pattern on the coating layer can be obtained through the color distribution of the coating on the first image, whether the pattern is qualified or not is judged according to the historical record, corresponding defect information is timely generated when the pattern is unqualified, and the defect information is transmitted to a designated terminal to be displayed, so that workers can timely carry out color compensation.
The technological quality control method of the water-based household electrical appliance color steel primer coating comprises the steps of irradiating a coating layer by utilizing light rays, obtaining a refraction signal of the coating layer, dividing the refraction signal into two parts of interference waveforms and detection waveforms, judging whether the current thickness of the coating layer meets a coating standard by comparing the maximum peak value of the detection waveforms with the average peak value of the interference waveforms, marking a plurality of detection points on the coating layer to establish an interference phase matrix, obtaining corresponding defect elements, transmitting the defect elements to a preset terminal for display, and reminding workers of repairing work.
Drawings
FIG. 1 is a simplified flow chart of the preparation method of the present invention;
FIG. 2 is a schematic diagram of experimental data for various conditions during the preparation of a primer coating according to the present invention;
FIG. 3 is a graph showing experimental data of water boiling resistance, film gloss and impact resistance of the primer coating of the present invention after being dried at different temperatures for different times.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the invention provides a technical scheme, a process quality control method of a water-based household appliance color steel primer coating, which specifically comprises the following steps:
s110, adding a proper amount of deionized water into the water-based paint for dilution, cleaning the surface to be coated by using an ultrasonic cleaner before use, removing wax, greasy dirt and dust sundries on the surface to be coated, using the unsealed paint as much as possible within 8 hours, independently storing the remained paint in a container containing internal coating treatment, maintaining the PH value at 7.5 when the paint is reused, and testing the water-based paint when the paint is recoated so as to prevent losing interlayer adhesive force;
s120, fully shaking or uniformly stirring the water-based paint, wherein the mixing mass ratio of the water-based paint is as follows: water removal ion = 1: (0-5%) the tools and containers used with the aqueous paint should be made of materials that do not react with water (such as stainless steel, plastics, etc.) or have a suitable internal coating treatment, and during construction, it is strictly prohibited to mix with other paints and organic solvents to prevent deterioration;
s130, fully shaking or uniformly stirring the water-based paint, and filtering the water-based paint by using a 300-mesh filter screen;
s140, during laboratory coating, a bar scraper, raw paint scraper or 2% deionized water is used for diluting, then the scraper is used, if the coating is carried out, the viscosity of the water paint is controlled to be 4 cups/55 seconds, a roller coating method is adopted during coating, a proper amount of water is added for diluting, excessive water is not added for diluting, water is used for diluting, the bias acid is avoided, the principle of a small amount of times is followed during diluting, and the line speed of the oil output of the roller coating during coating is: 60-100 m/min, the theoretical coating rate is 390 square meters/um.kg, the actual coating rate depends on the surface condition of the substrate (flatness and roughness of the coating surface);
s150, the temperature of a drying line body is 200 ℃, the temperature of a plate is 224 ℃, the drying time is 33 seconds, each coating and the final coating are subjected to dry film thickness detection by an electronic dry film thickness meter, when the film thickness is insufficient, the coating is required to be supplemented to a specified dry film thickness, the dry film thickness is 6 mu m, the wet film is 12 mu m, the temperature of the plate is 220 ℃ in the temperature range of 30 seconds, the temperature of the plate is 230 ℃ in the temperature range of 25 seconds, the temperature of the furnace is 240 ℃ in the temperature range of 30 seconds, the temperature of the furnace is 320 ℃ in the temperature range of 25 seconds, and experimental data are shown in fig. 2 and 3.
Example two
As shown in fig. 1, the invention provides a technical scheme, a process quality control method of a water-based household appliance color steel primer coating, which specifically comprises the following steps:
s110, adding a proper amount of deionized water into the water-based paint for dilution, cleaning the surface to be coated by using a surfactant before use, removing wax, greasy dirt and dust impurities on the surface to be coated, using the unsealed paint as much as possible within 8 hours, storing the remained paint independently, maintaining the PH value to be 7.5 when the paint is reused, and testing the water-based paint when the paint is recoated to prevent losing interlayer adhesive force;
s120, fully shaking or uniformly stirring the water-based paint, wherein the mixing mass ratio of the water-based paint is as follows: water removal ion = 1: (0-5%) the tools and containers used with the aqueous paint should be made of materials that do not react with water (such as stainless steel, plastics, etc.) or have a suitable internal coating treatment, and during construction, it is strictly prohibited to mix with other paints and organic solvents to prevent deterioration;
s130, fully shaking or uniformly stirring the water-based paint, and filtering the water-based paint by using an automatic vibrating screen;
s140, during laboratory coating, a bar scraper, raw paint scraper or 3% deionized water is used for diluting, then the scraper is used, if the coating is carried out, the viscosity of the water paint is controlled to be 4 cups/40 seconds, a roller coating method is adopted during coating, a proper amount of water is added for diluting, excessive water is not added for diluting, water is used for diluting, the bias acid is avoided, the principle of a small amount of times is followed during diluting, and the line speed of the oil output of the roller coating during coating is: 65 m/min, a theoretical coating rate of 390 square meters/um.kg, the actual coating rate depending on the substrate surface conditions (flatness, roughness of the coated surface);
s150, the temperature of a drying line body is 220 ℃, the temperature of a plate is 225 ℃, the drying time is 26 seconds, each coating and the final coating are subjected to dry film thickness detection by an electronic dry film thickness tester, when the film thickness is insufficient, the coating is required to be supplemented to a specified dry film thickness, the dry film thickness is 6 mu m, the wet film is 12 mu m, the temperature of the plate is 220 ℃ in the temperature range of 30 seconds during baking, the temperature of the plate is 230 ℃ in the temperature range of 25 seconds, the temperature of the furnace is 240 ℃ in the temperature range of 30 seconds, the temperature of the furnace is 320 ℃, and experimental data are shown in fig. 2 and 3.
Example III
As shown in fig. 1, the invention provides a technical scheme, a process quality control method of a water-based household appliance color steel primer coating, which specifically comprises the following steps:
s110, adding a proper amount of deionized water into the water-based paint for dilution, polishing the surface to be coated before use, electroplating, degreasing and cleaning by using an electroplating machine, removing wax, greasy dirt and dust impurities on the surface to be coated, using the unsealed paint as much as possible within 8 hours, storing the remained paint independently, maintaining the PH value to be 7.5 when the paint is reused, and testing the water-based paint when the paint is recoated to prevent losing interlayer adhesive force;
s120, fully shaking or uniformly stirring the water-based paint, wherein the mixing mass ratio of the water-based paint is as follows: water removal ion = 1: (0-5%) the tools and containers used with the aqueous paint should be made of materials that do not react with water (such as stainless steel, plastics, etc.) or have a suitable internal coating treatment, and during construction, it is strictly prohibited to mix with other paints and organic solvents to prevent deterioration;
s130, fully shaking or uniformly stirring the water-based paint, and filtering the water-based paint by using a 300-mesh filter screen;
s140, during laboratory coating, a wire rod scraping plate and raw paint are used for scraping or 0-5% deionized water is added for thinning, then the scraping plate is used, if the coating is on line, the viscosity of the water-based paint is controlled to be 4 cups/38 seconds, a roller coating method is adopted for construction during the coating on line, a proper amount of water is added for thinning, excessive water is not added, water is used for dilution, partial acid is avoided, the principle of a small amount of times is followed during thinning, and the line speed of oil output of roller coating during the coating on line is as follows: 75 m/min, a theoretical coating rate of 390 square meters/um.kg, the actual coating rate depending on the substrate surface conditions (flatness, roughness of the coated surface);
s150, the temperature of a drying line body is 320 ℃, the temperature of a plate is 228 ℃, the drying time is 32 seconds, each coating and the final coating are subjected to dry film thickness detection by an electronic dry film thickness meter, when the film thickness is insufficient, the coating is required to be supplemented to a specified dry film thickness, the dry film thickness is 6 mu m, the wet film is 12 mu m, the temperature of the plate is 220 ℃ in the temperature range of 30 seconds during baking, the temperature of the plate is 230 ℃ in the temperature range of 25 seconds, the temperature of the furnace is 240 ℃ in the temperature range of 30 seconds, the temperature of the furnace is 320 ℃, and experimental data are shown in fig. 2 and 3.
Example IV
As shown in fig. 1, the invention provides a technical scheme, a process quality control method of a water-based household appliance color steel primer coating, which specifically comprises the following steps:
s110, adding a proper amount of deionized water into the water-based paint for dilution, polishing the surface to be coated before use, electroplating, degreasing and cleaning by using an electroplating machine, removing wax, greasy dirt and dust impurities on the surface to be coated, using the unsealed paint as much as possible within 8 hours, storing the remained paint independently, maintaining the PH value to be 7.5 when the paint is reused, and testing the water-based paint when the paint is recoated to prevent losing interlayer adhesive force;
s120, fully shaking or uniformly stirring the water-based paint, wherein the mixing mass ratio of the water-based paint is as follows: water removal ion = 1: (0-5%) the tools and containers used with the aqueous paint should be made of materials that do not react with water (such as stainless steel, plastics, etc.) or have a suitable internal coating treatment, and during construction, it is strictly prohibited to mix with other paints and organic solvents to prevent deterioration;
s130, fully shaking or uniformly stirring the water-based paint, and filtering the water-based paint by using a 300-mesh filter screen;
s140, during laboratory coating, a bar scraper, raw paint scraper or a scraper after adding 4% deionized water for thinning is used, if the coating is carried out, the viscosity of the water-based paint is controlled to be 4 cups/50 seconds, a roller coating method is adopted during coating, a proper amount of water is added for thinning, excessive water is not added, water is used for thinning, the bias acid is avoided, the principle of a small amount of times is followed during thinning, and the line speed of the oil output of roller coating during coating is as follows: 95 m/min, the theoretical coating rate is 390 square meters/um.kg, and the actual coating rate depends on the surface condition of the substrate (flatness and roughness of the coating surface);
s150, the temperature of a drying line body is 330 ℃, the temperature of a plate is 228 ℃, the drying time is 28 seconds, each coating and the final coating are subjected to dry film thickness detection by an electronic dry film thickness meter, when the film thickness is insufficient, the coating is required to be supplemented to a specified dry film thickness, the dry film thickness is 6 mu m, the wet film is 12 mu m, the temperature of the plate is 220 ℃ in the temperature range of 30 seconds during baking, the temperature of the plate is 230 ℃ in the temperature range of 25 seconds, the temperature of the furnace is 240 ℃ in the temperature range of 30 seconds, the temperature of the furnace is 320 ℃ in the temperature range of 25 seconds, and experimental data are shown in fig. 2 and 3.
Example five
As shown in fig. 1, the invention provides a technical scheme, a process quality control method of a water-based household appliance color steel primer coating, which specifically comprises the following steps:
s110, adding a proper amount of deionized water into the water-based paint for dilution, polishing the surface to be coated before use, electroplating, degreasing and cleaning by using an electroplating machine, removing wax, greasy dirt and dust impurities on the surface to be coated, using the unsealed paint as much as possible within 8 hours, storing the remained paint independently, maintaining the PH value to be 7.5 when the paint is reused, and testing the water-based paint when the paint is recoated to prevent losing interlayer adhesive force;
s120, fully shaking or uniformly stirring the water-based paint by using a shaker, wherein the mixing mass ratio of the water-based paint is as follows: water removal ion = 1: (0-5%) the tools and containers used with the aqueous paint should be made of materials that do not react with water (such as stainless steel, plastics, etc.) or have a suitable internal coating treatment, and during construction, it is strictly prohibited to mix with other paints and organic solvents to prevent deterioration;
s130, fully shaking or uniformly stirring the water-based paint by using a shaking machine, and filtering the water-based paint by using a 300-mesh filter screen;
s140, during laboratory coating, a bar scraper, raw paint scraper or a scraper after adding 4% deionized water for thinning is used, if the coating is carried out, the viscosity of the water-based paint is controlled to be 4 cups/50 seconds, a roller coating method is adopted during coating, a proper amount of water is added for thinning, excessive water is not added, water is used for thinning, the bias acid is avoided, the principle of a small amount of times is followed during thinning, and the line speed of the oil output of roller coating during coating is as follows: 95 m/min, the theoretical coating rate is 390 square meters/um.kg, and the actual coating rate depends on the surface condition of the substrate (flatness and roughness of the coating surface);
s150, the temperature of a drying line body is 330 ℃, the temperature of a plate is 228 ℃, the drying time is 28 seconds, each coating and the final coating are subjected to dry film thickness detection by an electronic dry film thickness meter, when the film thickness is insufficient, the coating is required to be supplemented to a specified dry film thickness, the dry film thickness is 6 mu m, the wet film is 12 mu m, the temperature of the plate is 220 ℃ in the temperature range of 30 seconds during baking, the temperature of the plate is 230 ℃ in the temperature range of 25 seconds, the temperature of the furnace is 240 ℃ in the temperature range of 30 seconds, the temperature of the furnace is 320 ℃ in the temperature range of 25 seconds, and experimental data are shown in fig. 2 and 3.
The working principle of the device is as follows: firstly, materials which do not react with water (such as stainless steel, plastics and the like) or proper internal coating treatment is needed when the water-based paint is operated, the water-based paint is strictly forbidden to be mixed with other paints and organic solvents to prevent deterioration during construction, deionized water is added into the water-based paint to dilute the water-based paint, the diluted deionized water is uniformly stirred and filtered by a 300-mesh filter screen, the surface to be coated is cleaned by using a degreasing agent or cleaning agent before use to remove wax, greasy dirt and dust impurities on the surface to be coated, a wire rod scraping plate, a raw paint scraping plate or a scraping plate after the surface to be coated is diluted by adding 0-5% of deionized water, a roller coating method is adopted during coating and line application, a proper amount of water is added for dilution, excessive water is not added, the water is diluted by water, a small amount of principles should be followed during line application during the dilution, and the line application oil outlet rate of roller coating is as follows: the viscosity of the water-based paint is controlled to be 4 cups/35-60 seconds, the theoretical coating rate is 390 square meters/um.kg, each coating and the final coating are detected by an electronic dry film thickness meter, the coating is required to be supplemented to the specified dry film thickness when the film thickness is insufficient, the dry film thickness is 5-8 mu m, the wet film is 10-15 mu m, the plate temperature is 216-224 ℃ during baking, the plate temperature is 224-232 ℃ during 25 seconds, the furnace temperature is 180-350 ℃ during 30 seconds, and the furnace temperature is 180-350 ℃ during 25 seconds.
Example six
The invention provides a technical scheme, and relates to a process quality control method of a water-based household appliance color steel primer coating, which comprises the following steps:
collecting a first image of the coating layer;
inputting the first image into a first quadrant of a preset coordinate system, and respectively acquiring pixel coordinates corresponding to each pixel point;
respectively obtaining the corresponding color of each pixel point on the first image;
counting the paint colors contained in the first image;
respectively establishing corresponding color layers according to different paint colors, acquiring pixel coordinates corresponding to pixel points with the same paint color, inputting the pixel coordinates into the corresponding color layers, and drawing corresponding color patterns;
detecting pixel overlapping degree of each color pattern and each historical image in the historical image set, extracting overlapping parts of each color pattern and the corresponding historical image to form first pattern contours, and forming a pattern set according to all the first pattern contours;
dividing the first image into a preset number of image columns, respectively counting pattern contours corresponding to each image column, displaying the pattern contours on the second quadrant in a marked mode, and determining the number of complete patterns and the number of incomplete patterns existing in the first image according to a marked display result and a pattern set;
when the number of incomplete patterns is 0, judging whether the number of finished patterns is equal to a preset number;
if not, generating quantity error information, and transmitting the quantity error information to a preset terminal for display;
otherwise, generating pattern defect information, and transmitting the pattern defect information to the preset terminal for display.
In this example, the color layer represents an operating space established according to different paint colors to draw a corresponding color pattern;
in this example, the color pattern represents the pattern displayed on each color layer;
in this example, the first tread profile represents an overlapping portion of the color pattern and the history image;
in this example, the pattern set represents a set containing all of the second patterns;
in the example, the number error information indicates that the number of patterns on the coating layer is wrong and is not in accordance with the preset number;
in this example, the pattern defect information indicates that the pattern on the coating layer is defective.
The working principle of the technical scheme has the beneficial effects that: according to the process quality control method of the water-based household appliance color steel primer coating, the first image of the coating layer is collected, the pattern on the coating layer can be obtained through the color distribution of the coating on the first image, whether the pattern is qualified or not is judged according to the historical record, corresponding defect information is timely generated when the pattern is unqualified, and the defect information is transmitted to a designated terminal to be displayed, so that workers can timely carry out color compensation.
Example seven
The invention provides a technical scheme, and relates to a process quality control method of a water-based household appliance color steel primer coating, which comprises the following steps:
irradiating the coating surface by using a preset first light;
acquiring a refraction signal in a first incident direction of the preset first light ray irradiating the coating surface;
dividing the refraction signal into an interference waveform and a detection waveform based on the first incidence direction;
acquiring a plurality of detection peaks of the detection waveform, and extracting a maximum peak value from the detection peaks;
acquiring a plurality of interference peaks of the interference waveform;
according to the ratio of the maximum peak value to the average value of the interference peak values, the current thickness of the coating surface is obtained in a preset thickness-ratio list, and whether the current thickness of the coating surface meets a coating standard is judged;
if the detection points do not accord with the detection points, marking a plurality of detection points on the coating surface by using an equidistant method based on the area of the coating surface;
illuminating the coating surface by using a preset second light ray and respectively acquiring an interference spectrum corresponding to each detection point;
respectively acquiring the spectral phase difference of each detection point and the adjacent detection points, and establishing an interference phase matrix by taking the interference spectrum and the spectral phase difference as element coefficients;
respectively obtaining the discrete degree of each column element coefficient on the interference phase matrix, and extracting elements to be detected, wherein the discrete degree is higher than a preset discrete degree;
drawing the spectrum direction corresponding to each element to be detected, removing interference spectrums with consistent spectrum directions, and obtaining a defect element;
and acquiring the position corresponding to each defective element on the interference phase matrix, generating a thickness adjustment area, and transmitting the thickness adjustment area to a preset terminal for display.
In this example, the preset first light may be white light;
in this example, the first incident direction represents an angle at which the preset light irradiates the coating surface;
in this example, the interference waveform represents the signal portion of the refraction signal in the atmosphere, and the detection waveform represents the signal portion of the refraction signal at the image plane;
in this example, the number of maximum peaks is 1, and the number of interference peaks is several;
in this example, the equidistant method means a method of selecting an appropriate detection pitch according to the length and width of the coating layer;
in this example, the preset second light may be low coherence light;
in this example, the spectral phase difference represents the average difference between the spectrum at one detection point and the spectrum at two adjacent detection points.
The working principle of the technical scheme has the beneficial effects that: the technological quality control method of the water-based household electrical appliance color steel primer coating comprises the steps of irradiating a coating layer by utilizing light rays, obtaining a refraction signal of the coating layer, dividing the refraction signal into two parts of interference waveforms and detection waveforms, judging whether the current thickness of the coating layer meets a coating standard by comparing the maximum peak value of the detection waveforms with the average peak value of the interference waveforms, marking a plurality of detection points on the coating layer to establish an interference phase matrix, obtaining corresponding defect elements, transmitting the defect elements to a preset terminal for display, and reminding workers of repairing work.
Example eight
The invention provides a technical scheme, and relates to a process quality control method of a water-based household appliance color steel primer coating, which comprises the following steps:
cooling the coated surface to a specified temperature range after drying;
acquiring the current humidity and the current temperature of the environment where the coating surface is located;
calculating the odor diffusion coefficient of the coated surface at the current humidity and the current temperature according to a formula (I);
K＝a·f+b·exp(t 1 -t 0 ) (Ⅰ)
wherein K represents the odor diffusion coefficient of the coated surface at the current humidity and the current temperature, a represents the humidity representative value at the standard humidity, f represents the current humidity, b represents the temperature representative value at the standard temperature, t 1 Representing the current temperature, t 0 Representing a standard temperature;
when the odor diffusion coefficient of the coating surface at the current humidity and the current temperature is in a preset range, placing the coating surface at a preset first position, blowing the coating surface by using a fan with a preset wind speed, and calculating the duration T of the fan in blowing operation according to a formula (II);
Figure BDA0003403167670000151
wherein S represents the area of the coated surface, a 1 Indicating the diffusion amount of the corresponding coating surface per unit area before blowing by a blower, a 2 Indicating that the odor concentration at the corresponding second position reaches the standard concentration c under the condition of not adopting the blower to blow 0 At this time, the corresponding diffusion amount per unit area of the coated surface, v 1 (k) C) obtaining a standard diffusion rate of odor of the coated surface based on a diffusion rate-diffusion coefficient list without blowing by a blower 2 Indicating the second odor concentration, k, at the corresponding preset second position before blowing by adopting the blower 1 Indicating the influence factor on the time change caused by concentration diffusion after the blower is adopted for blowing, and the value range is (0.5,0.9), c 1 Indicating the initial odor concentration of the coated surface before blowing by a blower, L indicating the actual distance between the first preset position and the second preset position, L 1 A standard distance representing a first preset position and said second preset position；
And controlling the fan to work for a time length T according to the current power.
In this example, the standard temperature is 25 ℃, the corresponding humidity representative value is 0.25, the standard humidity is 26.1hPa, and the corresponding temperature representative value is 0.261;
in this example, if the current humidity is 50hPa and the current temperature is 27 ℃, then the odor diffusion coefficient of the coated surface at the current humidity and the current temperature is 2.46.
In this embodiment, the smaller the value of the influence factor of K1 is, the greater the influence degree of the corresponding T is.
The working principle of the technical scheme has the beneficial effects that: the process quality control method of the water-based household electrical appliance color steel primer paint has the advantages that as the paint has a certain pungent smell, certain smell can be remained on the household electrical appliance passing through the primer paint to influence the use of users, the dried coating surface is cooled and then subjected to smell dispersion, the duration of the fan in the blowing work is calculated according to a formula, the paint smell can be effectively removed, the purpose of saving resources is achieved, and convenience is brought to the users.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A process quality control method of a water-based household electrical appliance color steel primer paint is characterized by comprising the following steps: the method specifically comprises the following steps:
s110, adding a proper amount of deionized water into the water-based paint for dilution;
s120, fully shaking or uniformly stirring the water-based paint, wherein the mixing mass ratio of the water-based paint is as follows: deionized water = 1: (0-5%);
s130, fully shaking or uniformly stirring the water-based paint, and filtering the water-based paint by using a 300-mesh filter screen;
s140, scraping by using a wire rod scraper, scraping by using raw paint or diluting by adding 0-5% deionized water when coating in a laboratory, and then scraping by using the scraper, wherein when coating on line, the viscosity of the water-based paint is controlled to be 4 cups/35-60 seconds;
s150, drying the wire body at 180-350 ℃ and 216-232 ℃ for 20-35 seconds;
each channel and the final coating layer are subjected to dry film thickness detection by an electronic dry film thickness gauge, and when the film thickness is insufficient, the film is subjected to repair coating to a specified dry film thickness according to requirements, wherein the dry film thickness is 5-8 mu m, and the wet film is 10-15 mu m;
before the dry film thickness of each coating and the final coating is detected by an electronic dry film thickness tester, the method further comprises the following steps:
collecting a first image of the coating layer;
inputting the first image into a first quadrant of a preset coordinate system, and respectively acquiring pixel coordinates corresponding to each pixel point;
respectively obtaining the corresponding color of each pixel point on the first image;
counting the paint colors contained in the first image;
respectively establishing corresponding color layers according to different paint colors, acquiring pixel coordinates corresponding to pixel points with the same paint color, inputting the pixel coordinates into the corresponding color layers, and drawing corresponding color patterns;
detecting pixel overlapping degree of each color pattern and each historical image in the historical image set, extracting overlapping parts of each color pattern and the corresponding historical image to form first pattern contours, and forming a pattern set according to all the first pattern contours;
dividing the first image into a preset number of image columns, respectively counting pattern contours corresponding to each image column, displaying the pattern contours on a second quadrant in a marked mode, and determining the number of complete patterns and the number of incomplete patterns existing in the first image according to a marked display result and a pattern set;
when the number of incomplete patterns is 0, judging whether the number of complete patterns is equal to a preset number;
if not, generating quantity error information, and transmitting the quantity error information to a preset terminal for display;
otherwise, generating pattern defect information, and transmitting the pattern defect information to the preset terminal for display.
2. The process quality control method of the water-based household electrical appliance color steel primer paint is characterized by comprising the following steps of: before use, the surface to be coated should be cleaned by using a degreasing agent or a cleaning agent to remove wax, greasy dirt and dust impurities on the surface to be coated.
3. The process quality control method of the water-based household electrical appliance color steel primer paint is characterized by comprising the following steps of: the coating is constructed by adopting a roller coating method when being on line, a proper amount of water is added for dilution, excessive water is not added, water is used for dilution, biased acid is avoided, the principle of a small amount of repeated dilution is to be followed, and the line speed of the roller coating oil output when the coating is on line is as follows: 60-100 m/min.
4. The process quality control method of the water-based household electrical appliance color steel primer paint is characterized by comprising the following steps of: the tools and containers used with the aqueous coating should be of a material that does not react with water or have a suitable internal coating treatment, and should be tightly mixed with other coatings and organic solvents during construction to prevent deterioration.
5. The process quality control method of the water-based household electrical appliance color steel primer paint is characterized by comprising the following steps of: the unsealed paint is used up as much as possible within 8 hours, the remaining paint should be stored separately, the pH value is maintained at 7.0-8.0 when the paint is reused, and the water paint needs to be tested in advance when the paint is recoated so as to prevent the interlayer adhesive force from being lost.
6. The process quality control method for the water-based household electrical appliance color steel primer coating according to claim 1, wherein the theoretical coating rate is 390 square meters/um.kg, and the actual coating rate depends on the surface condition of a substrate.
7. The process quality control method of the water-based household electrical appliance color steel primer paint is characterized by comprising the following steps of: the temperature range of the plate temperature is 216-224 ℃ during baking, the temperature range of the plate temperature is 224-232 ℃ during baking, the temperature range of the furnace temperature is 180-350 ℃ during baking, and the temperature range of the furnace temperature is 180-350 ℃ during baking.
8. The process quality control method of the water-based household electrical appliance color steel primer paint is characterized by comprising the following steps of: when the first image accords with the history record, the method comprises the following steps:
irradiating the coating surface by using a preset first light;
acquiring a refraction signal in a first incident direction of the preset first light ray irradiating the coating surface;
dividing the refraction signal into an interference waveform and a detection waveform based on the first incidence direction;
acquiring a plurality of detection peaks of the detection waveform, and extracting a maximum peak value from the detection peaks;
acquiring a plurality of interference peaks of the interference waveform;
according to the ratio of the maximum peak value to the average value of the interference peak values, the current thickness of the coating surface is obtained in a preset thickness-ratio list, and whether the current thickness of the coating surface meets a coating standard is judged;
if the detection points do not accord with the detection points, marking a plurality of detection points on the coating surface by using an equidistant method based on the area of the coating surface;
illuminating the coating surface by using a preset second light ray and respectively acquiring an interference spectrum corresponding to each detection point;
respectively acquiring the spectral phase difference of each detection point and the adjacent detection points, and establishing an interference phase matrix by taking the interference spectrum and the spectral phase difference as element coefficients;
respectively obtaining the discrete degree of each column element coefficient on the interference phase matrix, and extracting elements to be detected, wherein the discrete degree is higher than a preset discrete degree;
drawing the spectrum direction corresponding to each element to be detected, removing interference spectrums with consistent spectrum directions, and obtaining a defect element;
and acquiring the position corresponding to each defective element on the interference phase matrix, generating a thickness adjustment area, and transmitting the thickness adjustment area to a preset terminal for display.
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