Coating process: low cost production process of water-based coating for interior wall

Key tips: 1 Formula (1) Formula of base material (oxidized starch glue): Raw material consumption / kg corn starch 32 flake alkali 8 hydrogen peroxide (27% - 35%), 1 ferrous sulfate 0.08 sodium thiosulfate 1 tributyl phosphate a small amount of water added to 400 (2) Paint formula: Raw material consumption / kgpva6 lime calcium powder (325 mesh) 200 oxidized starch glue 250 sodium bentonite 60 light calcium (325 mesh) 25 potassium alum 5 sodium fluoride 5 ultramarine 0.1 water added to 1000 2 Production process (1 Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Home of coatings: 1 Formula (1) base material (oxidized starch glue) formula: raw material amount / kg corn starch 32 flakes alkali 8 hydrogen peroxide (27% - 35%), 1 ferrous sulfate 0.08 sodium thiosulfate 1 tributyl phosphate a small amount of water added to 400 (2) coating formula: raw material amount / kg PVA 6 lime powder (325 mesh) 200 oxidized starch glue 250 sodium bentonite 60 Light calcium (325 mesh) 25 potassium alum 5 sodium fluoride 5 ultramarine 0.1 water added to 1000 2 Production process (1) preparation of oxidized starch: ① chemical flake alkali: take water (5 times of flake alkali) and add flake alkali to the container for stirring and melting, waiting for use ② Take water (5 times of sodium thiosulfate) and add it to the container, then add sodium thiosulfate to mix and dissolve it It is ready for use ③ Add the tap water in the formula (the remaining amount after subtracting the water used in step ① and step ②) into the mixing bucket, start the mixer, add the catalyst ferrous sulfate, mix and melt it, then add the corn starch to mix it into the slurry, after 5min, slowly add the alkali solution that has been melted, after that, fully mix it to make it a thicker starch glue, and lift the glue with the bamboo stick When it flows down gently, hydrogen peroxide can be added and stirred for about 60 minutes to make the starch glue fully oxidized At the end of oxidation, the obvious sign is that the glue becomes thinner obviously, a lot of air bubbles are that the glue turns white, and it has become the same water flow to lift the glue with the bamboo stick Add the sodium thiosulfate solution to the solution and add a little defoamer to remove the foam Stop mixing The finished glue is 400kg At this time, the viscosity is about 15-22s measured by 4 × viscosity cup (2) Preparation of PVA glue: take 114kg of water, add it into the glue pot, heat it up, when the temperature rises to about 60 ℃, add pva6kg, stir it, and make it not disperse into groups Continue to heat up to boiling, and make PVA dissolve completely When it is reduced to room temperature, weigh it If it is less than 120kg glue, add water to dilute it, and make up to 120kg, that is, glue with 5% concentration (3) Preparation of coating: ① firstly, add the water in the formula (minus the water used for dissolving PVA) into the barrel, add the alum and sodium fluoride that have been beaten into powder, and stir to make alum and sodium fluoride completely dissolve Then add the ultramarine powder and mix it well At this time, add the lime and calcium powder and mix it into the slurry to modify the lime and calcium powder The purpose of modification is to prevent the paint from turning yellow on the wall for about 20 minutes ② Mix talcum powder and part of light calcium with bentonite powder in advance, and mix evenly with shovel ③ Take about 1 / 3 of oxidized starch glue and add it into step ①, stir well, then add step ②, stir it into a soft thick slurry, and then add the remaining light calcium to mix well ④ While stirring, add PVA glue and mix well Then, gradually add the remaining oxidized starch glue, and fully mix for about 30min to make it a soft coating ⑤ Take out the coating and grind it to 80 μ m by the grinder, then the finished coating can be obtained, put in barrels, sealed, put into storage or sold and used If there is no grinder, it can be filtered with 120 mesh screen The fineness of the coating must be guaranteed, because the various properties of the coating are not fine, and even the powder will be removed 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,