Paint knowledge | binder raw material technology

It is suggested that borax can also be divided into powder and granular, and fine-grained borax is the best Borax can be divided into two grades according to its strength There are 10 water molecules in 10 moles of borax, which is called class 10 borax There are 5 water molecules in 5 moles of borax, which is called grade 5 borax The concentration of 5 moles borax is higher 5 moles of borax of 0.35 kg is equivalent to 10 moles of borax of 0.454 kg If two kinds of borax of the same amount are misused, the consequences will be serious If the borax is added to the raw starch and water emulsion, then the mixture is heated, the starch absorbs water and expands rapidly and becomes thicker than without borax There are certain limits on the amount of borax added 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 Coating home news: Borax borax also has powder and granular, fine-grained borax is the best Borax can be divided into two grades according to its strength There are 10 water molecules in 10 moles of borax, which is called class 10 borax There are 5 water molecules in 5 moles of borax, which is called grade 5 borax The concentration of 5 moles borax is higher 5 moles of borax of 0.35 kg is equivalent to 10 moles of borax of 0.454 kg If two kinds of borax of the same amount are misused, the consequences will be serious If the borax is added to the raw starch and water emulsion, then the mixture is heated, the starch absorbs water and expands rapidly and becomes thicker than without borax There is a certain limit to the amount of borax added, otherwise, it will affect the expansion of starch, the gelatinized paste will become brittle, and it will be powder when dry As long as the caustic soda contains 76% sodium oxide and no additives, it can be used as a commercial grade, granular or flake The composition is equivalent to 98% sodium hydroxide Caustic soda will absorb water in the air and reduce its strength Therefore, if the packaging barrel is damaged, it should not be used After opening the end to take materials, the end shall be closed immediately Caustic soda caustic soda is a kind of strong alkali, which can burn skin severely in dry state or in water Wear face mask and rubber gloves when handling caustic soda, and prepare a bottle of vinegar at any time, so as to deal with the skin stained with caustic soda immediately Caustic soda will smoke when dissolved in water Do not inhale the smoke The smoke is toxic Adding sodium hydroxide into the raw starch and water emulsion and heating the mixture can reduce the temperature of starch expansion and gelatinization According to this characteristic, the amount of caustic soda can be used to precisely control the temperature of starch expansion and gelation However, the addition of too much can split the gelatinized particles, reduce the viscosity and make the raw starch in the paste gelatinized in advance Formaldehyde and formaldehyde are in 37% aqueous solution state and measured according to the volume or wet weight specified in the formula Formaldehyde is used in general adhesives to prevent corrosion In some waterproof adhesive formulations, it is used as a chemical crosslinker Operation of formaldehyde must wear protective equipment, because formaldehyde on the eyes and skin has a strong irritant, smoke must not be inhaled The difference between water-resistant adhesive and common adhesive is that they usually contain more raw starch, less caustic soda, no or little borax Of course, a certain amount of waterproof agent is added to the water-resistant adhesive Many waterproof agents can be used, are water-soluble resin This kind of resin will become water-insoluble and water-resistant adhesive when heated on the paste line after chemical crosslinking with formaldehyde Most water-resistant adhesives have a limited life Some thicken gradually with time, even in the case of agitation Some machines have good operation performance, but their water resistance is greatly reduced Therefore, the adhesive must be used as soon as possible Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating 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