Home    Company News    The application of leveling agent, is the leveling agent dangerous? TWO

The application of leveling agent, is the leveling agent dangerous? TWO

Hits: 58 img

It is also worth noting that many types of thickeners have certain leveling properties through fat modification or other means. For example, alkali swelling associative thickener, small molecular weight fat modified hydroxyethyl cellulose, etc. For a certain formulation system, the appropriate leveling agent should be selected according to the properties of the formulation and the desired performance of the leveling agent Variety.

1. Solvent coating system

In primer and middle coat formulations, acrylic leveling agents are usually used. If degassing and substrate wettability are required, medium molecular weight or high molecular weight acrylic leveling agent should be selected. In the primer, if stronger substrate wettability is required, you can consider using silicone leveling agents and modified acrylic leveling agents that can significantly reduce surface tension (such as fluorine-modified acrylic leveling agents and phosphate ester modification agents). Acrylic acid leveling agent). If the side effects of silicone leveling agent and fluorine-modified acrylic leveling agent are stabilizing foam and affecting interlayer adhesion, phosphate modified acrylic leveling agent should be used.

In top paint and clear paint formulations, relatively high requirements for the appearance of the paint film, generally can choose low molecular weight acrylic leveling agent, so that good leveling will be obtained, and it is not easy to produce haze in the paint film. In the cross-linking curing system, the selection of acrylic leveling agents containing reactive functional groups often obtains better leveling properties and at the same time improves the physical and chemical properties of the paint film. If the paint film is required to have better fluidity or slip and scratch resistance, silicone leveling agent is necessary. In this case, it is best to use a combination of silicone leveling agent and acrylic leveling agent.

It should be pointed out that when applying on a vertical surface, the silicone leveling agent provides leveling performance while effectively reducing the sagging tendency of the coating. In addition, silicone leveling agents should be used with caution in the formulation of metallic flash paints, as they may cause uneven arrangement of flake aluminum pigments and uneven paint film colors.

2. Powder coating system

The leveling process of powder coatings is divided into two stages. The first stage is the melting of the powder particles, and the second stage is the melting of the powder particles and flows into a smooth paint film. The powder coating does not contain solvents and does not produce a surface tension gradient during the film formation process. The leveling is more related to the wetting of the substrate.

Acrylic leveling agents are often used in powder coatings. If the leveling agent is in a liquid state, it must be made into a masterbatch before it can be used. There are also powdered acrylic leveling agents that are specially used for powder coatings. This type of product adsorbs liquid acrylic leveling agents on silica powder, and some low-grade leveling agents are adsorbed by calcium carbonate.

If the powder coating needs slippage and scratch resistance, it is necessary to use silicone leveling agent. There are already powdered silicone leveling agents specially used for powder coatings. Care should be taken to avoid the formation of shrinkage cavities when using silicone leveling agents.

3. Water-based coating system

Water-based coating systems are divided into water-soluble systems and latex systems.

In water-soluble systems, it is necessary to strongly reduce the surface tension of the system. The most commonly used are silicone leveling agents and fluorocarbon leveling agents, which have the same effect as they are used in solvent-based coating systems. Of course, if a truly flat surface is required, the acrylic leveling agent for water-based systems is necessary.

For latex systems, the film-forming mechanism is completely different, and the viscosity does not change with the volatilization of the solvent. The use of a leveling agent in the formulation may improve the wettability of the coating's substrate. Acrylic leveling agent can improve the flatness of the paint film, but the main flow properties of the coating are controlled and adjusted by adding rheology control agents. .

Is the leveling agent dangerous?

Leveling agent (coating leveling agent, ink leveling agent) IOTA 3000 is a silicone surface additive that improves the wettability of the substrate by reducing the surface tension of the coating. Increase surface smoothness, scratch resistance and anti-blocking properties, improve leveling, increase gloss, and prevent Bernard vortex. It is suitable for adding in solvent-based, solvent-free and water-based coatings.

Structural formula or components:  Polyether modified organopolysiloxane physicochemical data and indicators:   Appearance: colorless to light amber liquid   specific gravity 25℃: 1.036  viscosity (25℃,  cst): 300~1200  refractive index (25℃) :1.4492 Cloud point (0.1% aqueous solution): 38℃ Water solubility: transparent Surface tension 25℃(mN/m): 22.7 Active ingredient (%): 100Safety:  Non-combustible and non-dangerous

The above is an explanation of the function of leveling agents and the knowledge of whether leveling agents are dangerous goods. I believe you should have more understanding after reading it. The content is for your reference only, and I hope it can be helpful to everyone. 

Online QQ Service, Click here

QQ Service

Wechat Service