The environmental protection process of coatings is accelerated, how to make self-painting water-based?

Oily self-spraying produces a large number of volatile organic matter, has a strong irritating odor, serious pollution of the environment and health.
years, with the improvement of people's health awareness and environmental awareness, water-like self-painting began to develop and launch.
the current market water-like self-spraying water content is very small, not more than 5%, organic volatiles are only slightly reduced, not to mention with real environmental protection

.
Zhongshan Bridge Chemical Group has developed a new water content of more than 30%, salt spray resistance, water resistance, weather resistance excellent environmental protection high-performance water-based self-spraying.
01 resin selection
Because the traditional ejaculation agent on the stability of water-based resin has a great impact, the general emulsion, dispersion can not be steadily dispersed among them, so water-based self-painting resin generally choose alcohol-soluble resin or water-soluble resin.
soluble resin to ethanol, isopropyl alcohol and other alcohols as solvents, formula can only add a small amount of water (generally no more than 5%), the resulting production of water-based self-spraying paint is not the true sense of environmental protection paint.
ordinary water-soluble resin because it is soluble in water, although the paint itself is environmentally friendly, but after the film paint film water resistance is poor, affecting the actual use of the effect.
-oxidizing dry type of water-based aliclicic acid resin because of slow dryness, low hardness, limited range of use, water-based epoxy esters due to the dark color of the decodant, resulting in paint film is very easy to change color.
so water-based self-spraying paint needs to choose modified water-soluble resins, such as epoxy modified, silicon modified, etc. to improve the water resistance of the paint film.
the selection of anti-rust pigments
the performance of salt spray resistance is closely related to the selection of anti-rust pigments.
trijustate is non-toxic, has no irritation effect on the skin, and contains no harmful heavy metal elements such as lead and chromium.
modified triphosphate root ion P3O105 - can form chelates with various metal ions, form an excellent passivation film on the surface of the coating, and has a strong inhibitory effect on corrosion of metals such as steel. And in the paint use of less, low unit cost, wide adaptability, the product is white, paint color can be freely adjusted.
modified zinc phosphate, no lead, chromium and other heavy metals, non-toxic and non-polluting, no irritating effect on the skin;
Two kinds of anti-rust pigments used together, excellent anti-rust effect, outstanding performance of salt spray resistance, and resin has a good affinity, with good dispersion stability, made of water-based self-spraying paint is not easy to layer and re-coarse, tank storage performance is good.
the type and dosage of the
dispersant has a very important effect on the stability of the pigment in the self-spraying tank and the water resistance of the paint film, the salt spray resistance and so on.
, a non-ionized water-based polymer dispersant was selected with minimal effect on water resistance.the choice of
04 desulbant
de-foaming agent needs to self-spray the original paint bubbles, bubbles produced during the spraying process and bubbles produced in the drying process should have a significant elimination and inhibition effect, improper de-foaming will affect the appearance and performance of the paint film.
is available, not only to see the effect of film coating when the production, more importantly, whether the desiccant can maintain a good long-term deblistering effect.
through a large number of comparative experiments, the selection of a Digao water-defying agent, with a long-term de-foaming effect.
the choice of
water-based self-spraying paint, the worse the wetting of the substrate, the more you need to choose a good substrate moisturizer.
through experiments, BYK's water-based wetting agent can meet the water-based self-spraying of the horse mouth iron plate, cold-rolled steel plate, ABS plastic plate, wood board, wall and other substrates of good wetting effect.
the atomization effect of
paint mist is the core of self-spraying construction application, and the size of paint mist droplets plays a very important role in the application effect.
main factors affecting the size of paint mist droplets are the type and content of ejaculation agent, the chemical and chemical properties of lacquer, the structural size of the valve and the structure of the micro-fog head.
the effect of the gas ratio on the water-based self-spraying atomization effect when the size of the ejaculation agent, valve and spray hole is kept unchanged.
results show that when the ejaculation content is high, the internal pressure is too large, explosive cans, and the paint material is diluted, the fog droplets float in the air is not easy to reach the object, thus affecting the use effect.
too little ejaculation agent, it may be poor atomization effect, easy to clog the valve, spray is not equal.
combined with the self-painting industry and its own product characteristics of comprehensive consideration, and finally determine the water-based self-painting gas ratio range for lacquer material: dimethyl ether . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
07 product performance
will be water-based acrylic resin, neutralizer, deionized water, additives, etc. mixed evenly after adding water-based color paste, high-speed dispersion evenly made into paint.
the paint will be filtered, according to a certain ratio of gas, filled into water-based self-spraying, according to BB/T 0047-2007, GB/T 14449-2008 testing, the results can be found in the table below:
.