Coating standard: JG / T 23-200 construction coating test plate preparation

Core tips: 1 The technical conditions of floor treatment, plate making method, drying of coating film and state adjustment of test plate of architectural coating This standard is applicable to the preparation of test plates for performance test of building coatings 2 The provisions contained in the following standards of the cited standards are the provisions of this standard by reference in this standard At the time of publication, the editions indicated are all valid All standards will be revised, and parties using this standard shall explore the possibility of using the latest version of the following standards Gb3186-1982 (1989) sampling of coating products JC / t412-1991 Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Coating home news: 1 scope of construction coating test board floor treatment, plate making methods, coating drying and state adjustment and other technical conditions This standard is applicable to the preparation of test plates for performance test of building coatings 2 The provisions contained in the following standards of the cited standards are the provisions of this standard by reference in this standard At the time of publication, the editions indicated are all valid All standards will be revised, and parties using this standard shall explore the possibility of using the latest version of the following standards Gb3186-1982 (1989) sampling of coating products JC / t412-1991 asbestos cement flat plate for building gb9278-1988 temperature and humidity for state adjustment and test of coating sample 3 materials and apparatus 3.1 asbestos cement flat plate for base plate, thickness 3-4mm, size and quantity determined according to relevant test methods The technical requirements of the base plate shall comply with the provisions of JC / t412 Plates of other materials specified in the relevant provisions for architectural coatings can also be used 3.2 sandpaper No.0 (120 mesh) sandpaper and No.2 (60 mesh) sandpaper, or sandpaper specified in relevant standards of architectural coatings 3.3 wire rod coater: it is composed of rod body and wire The wire with different diameters is wound around the rod body to form a coater with different specifications It can produce wet film with a film thickness of 12-120 μ M 3.4 the brush should be made of wool brush, horse hair brush, polyester fiber and other materials Its width is about 25-65mm Note: the weft of paint brush should be mixed with long and short silk The short wire adheres to the coating, and the long wire acts as the brush There should also be a filter strip near the handle bracket, which can well retain the coating, so that the amount of coating is moderate and the coating is even 3.5 balance: sensitivity is 0.5g 3.6 ordinary or vacuum spray guns can be used The spray gun form and nozzle diameter shall be selected according to the relevant standards of architectural coating 3.7 the head of the scraper shall be soft and elastic (preferably made of metal or plastic sheet), and its width shall be 60mm wider than the sample plate 3.8 the bottom plate of the scraper is made of metal, and its surface roughness is required to be ra3.2 μ M The thickness of the longitudinal edge strip depends on the coating thickness required by the product standard 3.9 roller brush: it is composed of roller brush head and roller brush holder 3.10 dip trough: plate trough 4 Before the test, prepare 4.1 sampling according to gb3186 4.2 for the preparation of base plate, first use No.2 (60 mesh) abrasive paper, then use No.0 (120 mesh) abrasive paper to polish the front of base plate, remove the floating ash on the surface, make the pH value of base plate close to 10 by soaking, and place it for at least 7 days under the conditions specified in gb9278 4.3 the preparation of the sample shall be checked carefully If there is any crusting on the surface, it shall be removed carefully, and then fully stirred evenly If the sample is still caked and uneven after full mixing, it shall be re sampled When the sample is multi-component, it shall be mixed according to the specified proportion of the product, and it shall be stirred evenly After mixing, it shall be used within the time determined by the product 5 Test plate preparation method: check whether the bottom plate surface is flat, free of defects and dust, and number it on the back of the bottom plate 5.1 wire rod coating method 5.1.1 coating method: select the appropriate wire rod coater according to the product standard requirements, and its dosage will be controlled (see Figure 1) And check whether there is any residue in the wire seam of the wire rod 5.1.2 put the bottom plate on a flat workbench, take enough evenly stirred samples and place them on one end of the bottom plate, so that there is no gap at the end of the short side, and place them evenly 5.1.3 the hand-held wire rod coater, along the surface of the base plate, pushes the coating to move to the other end at a constant speed, and spreads the coating into a uniform film (during the moving process, the wire rod shall not rotate or move horizontally) In addition to the special requirements of the product, two coats shall be applied generally, and the interval between coats shall meet the product requirements If there is no requirement, the interval shall be more than 4H 5.1.4 after each coating, the excess coating around the test panel shall be scraped off immediately, and the coating on the workbench shall be removed 5.1.5 after each coating, the residue on the line bar coater shall be cleaned carefully and wiped dry for reuse After coating, the coating shall face up and be placed horizontally 5.2 brushing method 5.2.1 brushing amount: the brushing amount should conform to the provisions of relevant product standards Generally, the actual brushing amount can be determined by any of the following methods after brushing A) paint the bottom plate after weighing, and then weigh again The difference between the two weights is the amount of painting B) take out a part of the sample and put it into the container, weigh it together with the brush, weigh the container and the brush together immediately after brushing, and the difference between the two weights is the brushing amount 5.2.2 brushing steps: select the appropriate brush according to the product standard requirements When brushing, it shall be brushed along the long side first, then along the short side, and then along the long side carefully to make it a uniform coating In addition to the special requirements of the product, generally two coats shall be painted, and the interval between the two coats shall meet the product requirements If there is no requirement, the interval between the two coats shall be more than 4H After brushing, the coating shall face up and be placed horizontally 5.3 spraying method 5.3.1 spraying amount: it is better to comply with the provisions of relevant product standards The base plate shall be weighed before spraying and then weighed The difference between the two weights is the spraying amount 5.3.2 spraying steps: during spraying, the distance between the nozzle and the plate surface should be kept between 20-25cm, moving along the long side at a constant speed Try to make the main direction of the spray paint perpendicular to the bottom plate, and make the elliptical section of the spray paint perpendicular to the moving direction of the spray gun The overlapping part of the foggy coating is about 1 / 3 If the spraying is repeated, the direction of the spray gun can be perpendicular to the previous direction Spray the sample evenly on the bottom plate, or spray it to the required pattern, one time, without blank and sagging Immediately after spraying, the coating shall be upward and the test plate shall be placed horizontally 5.4 scraping and coating method 5.4.2 scraping steps: place the bottom plate on the scraper and fix the longitudinal edge of the strip; make the scraper and the test plate approximately at 45 ° angle, first move the scraper evenly along the short side direction and pull up the scraper; then move the scraper evenly along the long side direction to make the coating even and even Take out the sample coating and place it horizontally Clean the scraper and scraper for reuse 5.5 roll coating method 5.5.1 roll coating amount: it should meet the requirements of relevant product standards After weighing the bottom plate, roll coating and then weighing The difference between the two weighing is the roll coating amount 5.5.2 rolling coating steps: put the sample into the dip tank, make 1 / 2 of the roller brush dip into the sample, roll the roller brush several times in the tank, and make the sample penetrate into the roller brush First roll the roller brush on the other base plate, and then dip the material in the material tank to make it absorb the sample evenly Lay the bottom plate flat, move the roller brush gently along the W-shape on the surface of the bottom plate, so that the paint is gradually applied on the bottom plate (the rolling operation should be light at first, and then gradually increase the force), and finally roll the roller brush along the longitudinal direction After the coating is dry, roll the second coat in the same way After rolling, the coating shall be placed horizontally with the coating facing up 6 when there is no special requirement for the curing and coating of the test plate and the finished sample plate, it shall be placed for at least 7 days under the standard state specified in gb9278, or according to the requirements of the product standard Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,