Paint knowledge adhesive formula

Core tip: each manufacturer has a specific paste formula The experience found in many years of practice must be strictly followed Any deviation may lead to poor adhesion and other quality problems The normal starch adhesive is a mixture of water, raw starch, cooked paste, caustic soda, borax and formaldehyde The approximate proportion is: 80% of water; 20% of starch (85% of raw starch, 15% of cooked starch); 2.4-2.8% of caustic soda (total starch); 2.7-3.2% of borax (total starch), about 10 mole; trace formaldehyde Most of the starch used in some carton factories in the United States is corn starch Some are unprocessed 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 Paint Home News: each manufacturer has a specific paste formula The experience found in many years of practice must be strictly observed Any deviation may lead to poor adhesion and other quality problems The normal starch adhesive is a mixture of water, raw starch, cooked paste, caustic soda, borax and formaldehyde The approximate proportion is: 80% of water; 20% of starch (85% of raw starch, 15% of cooked starch); 2.4-2.8% of caustic soda (total starch); 2.7-3.2% of borax (total starch), about 10 mole; trace formaldehyde Most of the starch used in some carton factories in the United States is corn starch Some of them are untreated pure corn flour, some of them are chemically treated, especially the treated special starch has good stability viscosity and excellent water content performance Some starch is powdery, some is granular Particles are only loose blocks made from powder, which are used to mix whole batches in the batter Some factories use corn starch which has been specially treated to produce a single viscosity adhesive Its gelation point starts at 61 ℃ and is completed at 63 ℃ Although the gelatinization point is low, the adhesive can be gelatinized quickly like the general double-sided machine paste The viscosity is usually between 27 and 32 seconds 680 gallons of paste with 500 kg of starch When starch is stirred in normal temperature water, its particles are dispersed into emulsions, but they do not dissolve or absorb water If the agitation stops, the starch will settle at the bottom and gradually form a hard block Once the hard block is formed, it will not be easy to disperse Starch dispersed in water begins to absorb water and expand when heated Raw starch is used in the adhesive formula and starts to expand at about 70 ℃ The expansion is completed when the temperature rises to 90 ℃ The gelatinized starch is very viscous, and its degree depends on the amount of starch in the water 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,