Water - based coating formulation design system - matting agent Types and characteristics of main extinction agents Types Features Organic matting agent (synthetic wax) It can not only extinction, but also increase the surface smoothness, enhanced hand feeling and anti-settling property of the coating film. However, such matting agents often affect the transparency of the coating film and even affect the interlayer adhesion of the coating film. Inorganic matting agent (gaseous silica) Organic matter surface treatment dispersity, anti - settling and coating handle, etc Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.

Water - based coating formulation design system - matting agent Matting agents are additives used to control the gloss of waterborne wood coatings to meet the broad needs of mainstream matt paints in today's market.The extinction mechanism of the matting agent can be arranged in an orderly manner on the surface of the coating film, so that the surface of the coating film is uneven, causing the light on the surface of the coating film to diffusely reflect, thereby achieving the purpose of extinction. The solid content of the resin used in the waterborne wood coating is relatively low, and the effective component of the waterborne wood coating is not high. In addition, it is a dispersion system, so the matting of the waterborne wood coating is relatively easy, but the matting of different waterborne resin systems is difficult. Generally, the acrylic emulsion is relatively well-extruded than the aqueous polyurethane dispersion, but is better than the aqueous polyurethane dispersion in terms of anti-settling properties.Therefore, the selection of matting powder must be considered in different systems and uses.The matting agent can select the refractive index similar to the refractive index of the water-based resin to reduce the transparency of the coating film, and also consider its matting effect, dispersibility, anti-sinking property and hand feeling in the system. Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.

The types and functions of surface control agents include: 1.Improve flow and leveling 2.Reduce friction coefficient and increase slip 3.Enhanced scratch resistance 4.Anti-blocking 5.Enhance the arrangement of matte powder, etc. 6.Special feel, such as softness, etc. 7.Others such as improving the water resistance and stain resistance of the coating film On the one hand, they balance the surface tension of the drying process to achieve uniform drying and flow, and reduce surface roughness; on the other hand, they concentrate on the surface during the drying process to form a smooth coating film, which increases the slip and other special properties. There are two main types of such additives: 1.Organosilicon: This kind of surface control additive can effectively improve the scratch resistance and abrasion resistance of the coating film when it is added in a small amount. Generally, it has poor compatibility with the system. If it is not properly selected, it will affect the coating film. Gloss and adhesion between coating layers. 2.Wax emulsions, such as palm wax and polyethylene wax: affect the gloss of the coating to a certain extent, which is related to its particle size and distribution. The wax emulsion should be added to 2% to 8% of the total amount of the formulation to have obvious effect. Excessive wax emulsion affects the strength of the film and reduces the adhesion between the layers. The recommended optimum dosage is 3% to 5%. Putty does not use wax emulsion unless there is a special surface effect. In general, there is no need to add wax emulsion in the solid color paint. Sometimes wax emulsions can be replaced with wax powder. The combination of two types of surface control agents is more effective, but the following aspects should be paid attention to: 1.Whether it seriously affects the gloss of the coating 2. Effect on adhesion between layers 3.Evaluation of foam stability 4.Storage stability of the system Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.

Types, characteristics and applications of main rheological AIDS Variety Feature Application Methyl Cellulose The water system is thickened and has high efficiency, but the water resistance is not good, it is easy to be degraded by microorganisms, moldy and smelly, and the thixotropy after thickening with the system is strong, and the leveling property is not good. Generally not used in waterborne wood coating systems Acrylic alkali swelling type Sensitive to pH,the compactness of the film is relatively better,and can provide medium and low shear viscosity, can prevent the film from sag, effectively prevent sedimentation, slightly affect the gloss, but improper use and system flocculation, resulting Particles require high in-tank viscosity or where strong thixotropic sag is required. Generally used in waterborne wood primers and anti-adhesive finishes Polyurethane associative thickener The pseudo-plastic water resistance is good, the compactness of the coating film is good, the gloss is hardly affected, the low shear viscosity is provided, the sag is prevented from being used synergistically, and the balance of high, medium and low shear viscosity can be provided, the leveling is good, and the amount is small. Acrylic alkali solubilized thickener with better effect Widely used in waterborne wood finishes The amount of the rheological additive is usually from 0.1% to 1.0% of the total amount of the paint. Several leveling agents can be used in conjunction with the application of widened shear stress. Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.