Technology sharing: the development of water-like crack paint

1. Introduction to water-based crack paint
crack paint itself is an art paint, it is after the decoration to form some more beautiful pattern with cracks, the pattern is mainly natural, quaint. In fact, we generally require the size of cracks, shape to be uniform, this aspect is related to the rationality of crack paint formula, on the other hand, with the gunman or paintman's painting process also has a great relationship.crack paint can be used in toys, handicrafts, architectural decoration, home decoration, especially for some antique, simulation of these decorations on top of
Chinese
. Our nearest example is mainly some home decoration background wall, that is, everyone's television placement place, generally will do some art painting, there may be crack paint, there may be some shellfish paint, or some wrinkles, so that the color and texture of the home are more three-dimensional, unlike the whole white or a piece of other colors will be slightly monotonous.introduce water-based crack paint, review the traditional solvent-based crack paint. Traditional solvent-based crack paint generally we master three principles, the first is to reduce the amount of film-forming substances, which increases the amount of pigment. Then improve the volatility of the solvent, so that the crack paint it causes has a relatively large comfort and small flexibility, so that the internal stress will produce a relatively large stretch strength, forming a contraction of uniform cracks.Generally we do crack paint will be a background matching use, at this time, we will choose a relatively strong contrast of colors, so that the effect is more beautiful, or more eye-catching, including the formation of some gold bottoms, or some black and white between such some of the artistic effects, giving people a very strong visual impact.But we all know that by reducing film-forming substances or increasing the amount of pigment used, and then improve the volatility of solvents, will cause crack paint, especially the adhesion of the paint is not so good, and generally is not shiny, but also relatively brittle, need to apply a layer of varnish on top to protect it from falling off, which increases the workload of the painter. Then because it uses a large number of organic solvents, especially the general paint is not too thick coating, coating is too thick is likely to cause its cracking uneven, or in some case not cracking at all, so there will be a large number of thinners.The use of a large number of thinners will inevitably cause more VOC, which is to pollute the environment, but also there is a relatively large safety risk, is easy to cause fire, because we use solvents are flammable, explosive, explosive hazards at any time, which requires that furniture industry or spraying plant to strictly grasp the safety measures. At the same time, so many solvents on the health of operators are also relatively large damage. Also based on pollution problems and health problems, the country is now vigorously promoting water-based coatings, including water-based resins, so we are in the water-based crack paint to do some work, and then hope to share with you.in fact, the most original crack paint on the market itself is watery. At the beginning of the family coating, including furniture and some of the use of agricultural tools or some operating tools, Chinese paint or paint is from the water-based start. Crack paint this water-based paint it also comes from this aspect. The earliest crack paint was made of Arabic glue. In some advertising industry, in some entertainment industry, film industry, or film posters, crack paint is also more extensive, out of the effect is more attractive to consumers.take a look at this most original crack paint, from the theater and film industry, which requires dramatic effects of the painting process, is now rare.the Arabic gum itself is a natural product, but also a plant extracted from the glial thing. It is water-soluble, that is, the equivalent of painting the kind of whether latex or some water-based resin it has a better adhesion, but first of all requires no oil. Then, moisture has a relatively large impact on its dryness, so generally requires a dry environment.Usually Arabic glue creates cracks by brushing a layer of this liquid Arabic resin, also known as Arabic gum, on the base of a water-based paint and then drying it in a less humid atmosphere, but it takes at least an hour or more. Then water-based paint, that is, some latex paint or some water-based other art paint on the top. In the case of final drying brush, according to the brush to apply, generally is relatively light past, do not repeat back and forth more than three times, otherwise the Arabic glue may be past, may not break.this process is more traditional, perhaps we have less contact, I will take it with me.After applying water-like varnish or color paint to the top of the Arabic glue, it starts to break up in about thirty seconds, and then it takes at least half a day to make it completely dry, so that the traditional water-like paint is slow to dry. In the process of drying some small places crack unevenly, or crack more effective when you can use different colors ah what to do some embellishment, so that we can get some different artistic effects.
these are some of the operating diagrams when the artisa does the more exaggerated crack effect.。 2. The formation and preparation principle of water-based crack paint
And then, now let's talk about the mechanism of the production of water-based crack paint. Water-based crack paint is now mainly the use of its primer and paint surface temperature difference to form cracks, but also the use of primer and paint between the degree of drying, drying speed gap to form cracks. When cured into a film, the primer of the paint film will obviously shrink, so that it can produce water-based crack paint, and this water-based crack paint is not based solely on the increase of pigment fillers, reduce the amount of film resin to achieve, it can rely on simple normal water-based paint to get fine cracks, so it can get directly bright crack paint.
this diagram is the traditional principle of the formation and preparation of this solvent-based crack paint. In fact, in this regard and water-based crack paint cracking mechanism is similar, just said that when doing water-based crack paint did not require to use a high PVC concentration or is the amount of film-forming material to reduce the paint, so it is available with normal paint, normal paint to get mechanical properties, do not need to be reflected through the hood light art paint.The advantage of water-based crack paint is that there is no need to add a lot of pigment fillers, and then you can get some clear cracks, this in solvent-based, especially nitro crack paint I have not received such an effect, some may use some polyurethane trimer such a very strong shrinking effect to get, this can also, but to get a more uniform effect or relative to water-based crack paint is difficult. Water-based crack paint it does not need to increase pigment fillers, do not need to deliberately reduce the amount of resin, you can get a better cracking effect, especially the effect of cracking, it is done very well.water-based crack paint in the crack effect and solvent-based crack paint is a certain difference, especially in the production of high-gloss crack effect, it is to do cracking effect is better. Then high pigment concentration, it can make nitro paint like petal-like crack effect, but the advantages of making this effect is not as good as nitro paint.like this in the big crack there are some small cracks without bursting of this nitro paint effect, generally it is matched with the crack paint PVC concentration is a little higher.
water-like crack paint is easier to show when it's making cracks.
In the water-based acrylic white primer with water-based polyurethane iron-red paint, because at that time water-based polyurethane iron-red paint we use a more high-gloss resin, it is also relatively fast film, so out of its straight-grain effect is the traditional type of cracking, and nitro type is still a bit different. But this board in the production time is appropriate because the spray is not so uniform, so it seems to be a more broken place, there are large pieces of some places, that is to say, not so balanced, but our experimenters are not professional gunners, then we can see the effect is good. then we got some transparent crack paint by making varnish, which is not possible.
we do this water-based crack paint, the material selection is deliberately to do a match. Our water-like primer is generally required to dry more slowly, and then it has to have a certain hydro-hydro, so as to facilitate the cracking of this water-like crack paint. So when we synthesize water-based resins, that is, primer synthesis, there are two directions, one is water-based aliclicic acid resin, the other is water-based acrylic resin, to achieve the water-based crack primer supporting role. here is a general talk about the synthesis of water-based alicic acid resins. General water alcoholic acid resin dry and solvent than is dry a little slower, and for additives, especially for dry material to block the role is obvious, so we are in the choice of oil drops are the choice of double-bonds more flaxsal acid, in fact, the lysoic acid should be better, but the color of lysate is too deep, not so stable, so our example is linen acid-based. We use almost 40% to 50% of this flaxate; then the raw material is trihydroxymethyl propane, about 25 parts; and then the amount of glucodol is about 5%; then the amount of methylphenidate, which is used less in solvent-based alkyd resin, but in water-based alkalic acid resin it is more useful acid; First we put xylitic acid, trihydroxymethyl propane, then tetrylitol, interbenzene, directly into the reactor, then heat up the esterification, and then to the whole resin becomes clear, then insulation, and then to the acid value below 10. At this point, we think it's a more thorough esterification reaction, and then we start vacuuming. to 160 degrees, we add the dehydride and keep it warm at 180 degrees, then stop its reaction until its acid value is 40 to 60 milligrams of potassium hydroxide per gram, so that it has enough arbond base and a better water solubility. this time we cool it to 140 degrees and then add a certain amount of glycol monoclothyl ether. This solvent is now more taboo abroad, because glycol ether is a certain reproductive toxicity, but in our country is allowed to use. Then it is in the water-based coating including water-based resin, its solubility and compatible with water is better than some environmentally friendly solvents, in fact, we also use propylene glycol methyl ether to do dilution, in fact, can also do, but the final result of the water solution is still worse than this. diluted, we used to use triethylamine in neutralization and mix for about 30 minutes, so that its ph value is alkaline, almost 8 to 9. Now we generally do not do this, now are directly added to ethylene glycol monoclode or pm these solvents, do high acid value of aolic acid resin to treat. At this time, in fact, can be almost water and oil common, which also improves its application surface. Before we are to add deionized water, and then stir it evenly, and then into water dispersed alicyl resin, and then we found that this is a difficult problem in the packaging, add water and then use galvanized barrels to install, it has a very serious problem is that water corrosion of light metals, so finally we choose not to moderate, without water, let customers choose how to go to moderate, give customers greater freedom. In terms of water-soluble acrylic resin, we also have an example, why not use water-based emulsion to make primers, in fact, we can obviously feel the water resistance of water-based emulsion, is much better than water-based acrylic resin, so that it is not conducive to the formation of cracks. So when choosing a water-based crack primer, we choose a water-based acrylic resin. I'll describe the approximate synthesis formula and progress of this water-based acrylic resin. our water-based acrylic resin is acrylates, acrylics, methyl acrylates, and then the trigger is benzoyl peroxide. The amount of propylene is about 30 servings, acrylic 6 to 8 servings, methyl acrylates about 30 copies, and then the trigger is 3 to 4 servings, and then the solvent is positive butanol. the process is acrylic, methyl acrylates, acrylic, and then benzoyl peroxide, so that they mix evenly, dissolve evenly, and then add to the drip funnel. Add butanol to the fake blender and heat up to the boiling point of the solution.
about two minutes of reflow, and then the drip for free-form polymerization reaction, control the entire liquid within 2 to 4 hours of dripping, to drop more uniform, temperature control between 110 degrees to 125 degrees. drop plus finished, the solution is in a boiling state, we keep warm for 3 hours, the refill trigger is basically about 5 grams, and finally add water dilution, to get a water-soluble acrylic resin. We chose water-based polyurethane resin to make paint, water-based polyurethane release of water is faster than alcoholic acid, acrylic, so the use of such drying speed difference to produce cracks, basically this is the principle of cracks.
Let's look at the synthesis of water-based polyurethane resins, the raw materials are isofolone diocyanate, i.e. ICI, polyester binary alcohol, dihydroxymethyl propane, 1-6 hexyl glycol, hexydiol, neo-glycol, phthalates, trihydroxymethyl propane, triamide, and DMF these to make water-based polyurethane. These raw materials in a certain temperature and a certain pressure of the existence, and finally add triethylamine these neutral, add deionized water, chain of ethyl amine, high-speed dispersion, you can get water-based polyurethane dispersion, this water-based polyurethane dispersion particle size is relatively fine, so basically get the blue phase of the liquid. Finally decompression distillation, take out acetone, get this water-based polyurethane resin.
's our experiment