With the rapid development of water-based wood paint, more and more oil-based wood paint manufacturers in the process of transferring from oil-based to water-based, in the application of transparent color some difficulties, because the previous oil-based paint mainly used alcohol-soluble dyes can basically meet the requirements of oil-based wood paint transparent coloring, water-based is not possible, because the main diluent of water is water, the base material is mostly polyphase, and the base material is mostly polyphase. There is not enough "oil" to wrap and moisten the color of the powder, the hydrophilic oil balance of various substances in the paint, etc.

At present, there are mainly the following products in China to achieve transparent coloring:

1. Dye (commonly known as color essence); 2. Solid color film; 3. Transparent color paste.

1

Let's talk about the most used dyes!

Because the dye is in the form of molecules, the biggest advantage is transparent, bright, good penetration. The disadvantage is that the light and heat resistance is poor, it is easy to permeate color migration, and there is also the risk of excessive heavy metal detection. We use the most acid metal complex dyes (metal complex dyes), metal ions are usually copper, cobalt, chromium, nickel plasma, usually structure as shown in Figure 1), the use of dye powder with alcohol ether solvents dissolved into 20-30% of the liquid, we are usually called water-oil versatile color concentrate, in order to facilitate the use of the market, Are sold dissolved liquid, but the shelf life of the liquid is relatively short, and because it contains a lot of solvents, it is still a chemical dangerous goods, and it needs to pay attention to safety when storing and transporting. In the water-based paint, there is also the use of a pure water-based color essence, which is dissolved with acidic dyes, because of the more water content, it is easy to slow dry and elastic problems.

2

Solid film

The latter two are made of pigment, in foreign countries, everyone called pigment preparation (pigment preparation), they are solid or liquid made of pigment grinding or dispersion, liquid is usually a suspended state, so its transparency is not as good as the dye, but it will have better resistance relative to the dye. In the case of correct pigment selection, it is not easy to transfer color, and the choice of color will be diversified.

carrier base resin is required to be added to the production of solid color sheets, usually solid flake or granular, before use, it is still dissolved with alcohol ether solvents like dyes, and the transparency is very high at a low production cost, but because it contains base resin, it will have a bad impact on the compatibility of many systems of water-based coatings. Therefore, it will be widely used in the water-based ink and leather industry.

3

Transparent color paste

At present, the common problem of water-based colorants is the floating color flower, which is incompatible with the base material. To achieve a highly transparent color paste, we must first be a high-quality color paste, high-quality color paste must be high color with low viscosity, stable storage is not easy to float color and has broad compatibility. Many color pastes on the market are mostly made of oil-based commonly used toner through strong dispersion, and there is no selected raw material in the distribution of particle size is very wide, which often makes the color paste transparent and dark. At the same time, most color pastes are more inclined to the stability of color pastes. The stability of compatibility with the base material is not involved, such as the instability of viscosity caused by severe bridge dehydration, the color flocculation caused by serious reverse rotation, and the separation of anchoring groups caused by serious polarity.

UCHEM's UTINT WNW series nano color paste for waterbased wood paint (UTINT WNW series) is based on its core technology polymer coating treatment at the US headquarters, and then the pigment powder is dispersed to a particle size of 20-200nm by nano-dispersion technology at the production base in China (see Figure 2, particle size distribution diagram of UTINT WNW130 gold. Different colors have different particle size distributions.) Has excellent particle size distribution, while the color paste is extremely stable. The design of the formula is exquisite and reasonable, and the problems such as the toning float color of the common finished paints in the market, spraying flowers, and the large changes in viscosity during mixing and storage can be greatly improved by the use of this color paste. Nano color paste has excellent transparency is its essential feature, and broad compatibility is its foundation.

One last point to remember: not all transparent pastes can be called nano pastes!

UTINT Waterborne wood paint nano color paste WNW series