Colloid mill for the production of emulsion-based water-based industrial paints
Colloid mill for the production of emulsion-based water-based industrial paints
The emulsion type water-based industrial lacquer oil is designed by the coating formulation, pre-mixed by the mixer, and then enters the multifunctional colloid mill and pulverizing pump developed by Wenzhou Haoxing Machinery Equipment Manufacturing Co., Ltd. and the grinder pump, etc., which has shearing, dispersing, emulsifying, and Quality, depolymerization, agitation, mixing, crushing and pulverization are mainly used. Under the high-speed driving of the motor, the material is directly grounded from the inlet by the thruster device through high shear synchronous grinding into a shearing and crushing system, effectively breaking through two A special pulverizing device for grinding and refining system, which quickly breaks up some large particles, sticky masses, agglomerates and other particles in the fluid, and then injects into the shear pulverization zone to finely pulverize, in the very narrow working aisle due to the rotor blade It is cut at a relatively high speed with the stator blade to generate strong friction and grinding and the like. Under the action of mechanical motion and centrifugal force, the pulverized and refined material is re-pressed into the refining zone for grinding and crushing. The fine grinding is divided into three to four grades. The more outwardly, the higher the accuracy of the first-stage grinding disc, the smaller the pitch. The longer the line speed, the finer and finer the material, and the fluid gradually curves toward the radial direction. The direction velocity of each fluid changes instantaneously, and is subjected to tens of millions of high-speed shears per minute, strong friction, extrusion grinding, particle pulverization, etc., in tens of millions of high speeds passing through three refining zones. After shearing, grinding and pulverizing, the liquid molecular chain, particle pulverization, liquid particle tearing and the like are produced to fully disperse, pulverize, emulsify, homogenize and refine the material. Special low-temperature industrial mining requires that the pulverized material passes through the state of cooling at low temperature. The comet multi-functional colloid mill has a conveying head of 5-30 meters at the same time, and the special multi-stage shearing conveying Yang process can reach 30-60m. Entering the mechanical pulverizer cavity through the colloid grinding wheel (stator and rotor) to rotate at a relatively high speed, material and blade, toothed disc, material and material reciprocal impact, collision, shearing, mixing, stirring, emulsification, homogenization, Under the combined action of grinding and friction, it is made into an emulsion type water-based industrial lacquer oil with the ideal effect of ultrafine particle pulverization.
Emulsion-based water-based industrial paint coatings impart decorative, protective, and special functions to the coated object, but also have a large negative impact, that is, the organic volatiles pollute the atmosphere, which is well known. After a long period of public opinion calls, the threshold of the environmental protection department has risen, the government policy has restricted and supported, and the development of coatings in an environmentally friendly direction has made great progress. Solid and solvent-free coating products account for a certain share of the market. The chemical curing produced by replacing the organic solvent with water, the drying and solidifying coating is also becoming more and more mature, and is widely used in products capable of realizing the coating operation of the assembly line. The reason why water-based coatings are applied in these fields is that the drying method successfully solves the negative effects of water-based coatings instead of solvent-based coatings, such as gloss and fullness after drying, and the water resistance of water-based paints is poor. The problem is also completely solved by chemical curing, light curing, and curing. This is a type of coating that is forced to cure and dry in the assembly line. It can successfully replace the traditional solvent-based coating products and is recognized in the coating industry. However, in large steel construction, basic construction machinery, bridges, petrochemical equipment, ships, railway wagons, power transmission and transformation equipment, such as high protection performance requirements, decorative performance requirements are relatively lower, and can not be forced to dry, Affected by climate change, it brings some constraints to the coating of water-based paints. The drying speed, hardness and water resistance of coatings are a common problem faced by the coating industry, although acrylic modified waterborne alkyd is dry. Speed, paint film water resistance, hardness, etc. have made great progress compared with pure water-based alkyd, and water-based self-drying acrylic paint has also made great progress, but these resins need to introduce a large number of hydrophilic groups in the formulation process. The anion needs to introduce a carboxyl group, the cation needs to introduce an amino group, and the nonionic ion needs to introduce a hydroxyl group, and these hydrophilic groups are thresholds for the water-based coating to be unavoidable. Especially in the natural dry coating at room temperature, these hydrophilic groups cannot be eliminated, and long-term exposure to the natural environment is affected by the atmosphere, which is bound to affect weather resistance and water resistance. At this point, the water-based product cannot be combined with the solvent type. The products are comparable.
Acrylic acid (methacrylic acid) and its derivatives, acrylic emulsion formed by free radical emulsion polymerization, after more than 20 years of development in China, from the combination of various functional monomers, the emulsion synthesis technology is very mature. It has a good application in the fields of construction, paper, leather, textile, wood, etc. The architectural emulsion paint based on acrylic emulsion accounts for 40% of the total domestic coating. The acrylic emulsion has a fast drying speed and high gloss. This is not comparable to other latexes.
The acrylic emulsion is modified to produce a protective lacquer for ferrous metals with several advantages:
1. The emulsion itself has no organic volatile solvent.
2. Even if some solvent-based film-forming auxiliaries are added during the lacquering process, the amount is much smaller than other water-based lacquers.
3, the emulsion synthesis process does not need to consider the problem of hydrophilic groups, its water resistance
Weather resistance is not a problem. However, it should be pointed out that the architectural latex paint is applied on the cement substrate, while the metal latex paint is coated on the ferrous metal, and its various indexes and the performance of the latex paint are also two different product varieties. Its design philosophy is also completely different from the two ideas.
