How phthalocyanine blue pigments maintain stability in water-based industrial paints

Phthalocyanine blue is a bright blue pigment with excellent light resistance, weather resistance and temperature resistance. Phthalocyanine blue is often used in water-based industrial paints, paints, coatings, inks, stationery, plastic masterbatches and rubber products. coloring.

With the gradual improvement of standards and the increasing awareness of consumer groups in recent years, solvent-based coating products are facing a situation of being replaced. In recent years, through the continuous attempts, exploration, research and improvement of industry participants, the performance and practicability of water-based industrial paints have been greatly improved and improved. The popularity of lacquer brought hope and basic conditions.

According to the market demand and the performance of coloring pigments required by water-based coatings, Tianjin Zhengzhong Honghua Chemical Co., Ltd. has invested heavily in research and development to transform and upgrade the products of pigments based on phthalocyanine blue, making them suitable for the coloring needs of water-based coatings.

1. Inclusive Impact

However, since the dispersibility of pigments in water-based resins or emulsions is not very ideal, especially macromolecular phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green, it is necessary to grind into water-based color paste first, and then mix with additives, water-based resins or phthalocyanines. The emulsion is stirred to make a water-based industrial paint. If the tolerance of the water-based resin or emulsion is poor, it may not be integrated after adding the phthalocyanine blue paste, or the phenomenon of floating color may occur when painting.

Therefore, the choice of resin system must have good tolerance to phthalocyanine blue. At present, most of the pure acrylic, styrene acrylic, polyurethane, modified polyurethane, fluorocarbon, silicone acrylic, PUAPUD, and most resin systems on the market can accommodate phthalocyanine blue paste. Inspection method: Do a small test printing plate observation, if there is delamination and floating color, the resin system is not tolerant.

The effect of leveling

The surface tension of water-based industrial paints is generally high, and the bottom leveling and surface leveling properties of the paint liquid are poor. After adding phthalocyanine blue paste, it may further affect its leveling properties, so it is necessary to add dust-proof rheological additives. Improve the leveling of water-based industrial paints.

Therefore, in the water-based industrial paint, the macromolecular polymer dispersant containing the phthalocyanine blue pigment affinity group is selected. The molecular structure of this type of dispersant mainly has two parts, the pigment affinity group and the compatible extension in the aqueous solution. chain. Relying on the phthalocyanine blue pigment affinity group to anchor and adsorb on the surface of the pigment particles, and then rely on the compatible extension chain in the aqueous solution to form a steric hindrance effect, so as to stabilize the dispersion of phthalocyanine blue pigment and prevent the precipitation of phthalocyanine blue pigment. .

3. The effect of defoamer

When generating phthalocyanine blue water-based color paste, some of the additives used are also less than surface active substances, which will reduce the surface tension of the resin system. During this process, a large amount of foam will be generated. A large amount of foam will make the shear force unable to transmit the material, the motor will run idly, and the equipment utilization rate will be seriously insufficient, resulting in insufficient dispersion of the phthalocyanine blue pigment, and even unable to generate effectively.

Therefore, when phthalocyanine blue is used in water-based industrial paints, choosing appropriate additives is very helpful for the stability of phthalocyanine blue pigments in water-based industrial paints.