1, crosslinking agent

Cross-linking agent is a compound that can convert thermoplastic substances into thermosetting substances. They are multifunctional compounds, which can react with functional groups on macromolecular chains, so they can form thermosetting or three-dimensional polymer materials. A cross-linking agent is at least a compound with two or more functional groups, and after cross-linking, it becomes a part of thermosetting materials except the part removed in the cross-linking reaction. These crosslinking agents can be low molecular compounds or high molecular weight polymers. For example, melamine crosslinking agents include hexamethoxymelamine, melamine resin and other aminoplastics, isocyanates, epoxy resins and amine compounds.

Silane crosslinking agent containing epoxy functional group can be used as curing agent of waterborne coatings under alkaline conditions, room temperature or heating conditions. Mainly used as crosslinking agent for acrylate latex paint or polyurethane dispersion containing carboxyl or amino groups. The crosslinking mechanism involves the double chemical reaction of epoxy siloxane, and alkoxysilane is hydrolyzed and condensed to form siloxane bond. The alkoxysilane can also react with the interface, which can improve the wet adhesion of the coating, or react with the filler in the coating to improve the adhesion of the pigment.

The physical and chemical properties of cross-linked paint film have changed, so why change the hardness, tensile strength, modulus, elongation, solubility, swelling and other properties of paint film? However, crosslinked polymers swell to some extent in previously soluble solvents. The deeper the degree of crosslinking or the more bonds formed between chains, the lower the swelling degree in solvent.

2. Wear resistance improver.

Wear is a phenomenon caused by mechanical friction, scraping or corrosion, and there are mainly two forms: abrasion and wear. Scratch is the permanent deformation of the surface of an object, but this deformation will not damage the torus. Wear is the surface loss caused by some mechanical movements, such as wind erosion, sliding friction and the wear of road tires. This kind of wear is gradual and continuous.

Go on. Wear resistance combines the following basic factors: elasticity, hardness, strength and toughness, especially wear resistance and thickness. In addition, wear resistance is closely related to skid resistance and scratch resistance. Therefore, substances that can improve skid resistance and scratch resistance will also improve wear resistance. The volume properties of polymeric pigments affect the wear resistance of coatings. In addition, physical fillers also help to improve some mechanical properties of the coating.

Commonly used substances to improve wear resistance are: silica glass beads, specific glass beads and other similar compounds that can improve hardness. Some silicone resins and some oil compounds can reduce the friction on the surface, making it easier for objects to slide on the surface, thus reducing wear. Wear resistance can also be improved by using some oligomers with more functionality or increasing the amount of crosslinking agent to increase the crosslinking density. In addition, paraffin wax can also be named to improve skid resistance and wear resistance.

3. Mould inhibitor

Bactericide is an additive that can inhibit the growth of microorganisms and their cells. Whether it can kill these microorganisms. Mold inhibitor can inhibit the growth of mold coating surface. More generally, mildew inhibitors are added to coating formulations to protect coatings from microbial damage during storage or application.

4. Acidic catalyst

Acidic catalysts are usually used to accelerate chemical reactions. Strong acids such as p-toluenesulfonic acid are more commonly used. In addition, dodecylbenzene sulfonic acid and hexafluorophosphoric acid are also commonly used. When strong acid is used as catalyst, the strength of acid does not necessarily affect the curing speed, but it does affect some properties of the coating. The most widely used strong acid is p-toluenesulfonic acid. Weak acids such as butyl phosphate, derivatives of aromatic phosphate and various carboxylic acids are also used in some coating systems. Application of blocked acid catalysts in many crosslinking reactions.

5. Surfactant Surfactant

When surfactant is added to a liquid, its properties will change when it comes into contact with other liquids, solids and liquids. Surfactants will change the interface characteristics of liquids. The surface control agent is multifunctional, which can improve leveling, sliding and scratch resistance, and prevent the formation of shrinkage cavity and floating color of pigment.

6. Acid scavenger

In ink or coating system, vinyl polymer will age with the increase of use time, producing trace hydrochloric acid. Acid remover is a substance that can remove trace hydrochloric acid from the system, and has no adverse effect on the coating system, substrate and substances in contact with it. Some compounds, such as alicyclic epoxy compounds and epoxidized soybean oil compounds, can easily react with strong acids and can be used as deacidifiers.

7. Emulsifier

Emulsifiers belong to the category of surfactants or surfactants. Usually it can turn two partially incompatible liquids into a stable mixture. Emulsifiers can form water-in-oil or oil-in-water emulsions. It can promote the mixing and dispersion of liquid by reducing the surface tension of liquid, and can also be used as a wetting agent to reduce the surface tension of liquid and spread it on the solid surface.