Water-based emulsion pressure-sensitive adhesive using water as dispersion medium

The preparation of water-based emulsion pressure-sensitive adhesives using water as a dispersion medium usually involves steps such as emulsification, polymerization, and cross-linking.

Here is a basic preparation process:

Steps to prepare water-based emulsion pressure-sensitive adhesive:

1. Material preparation: Prepare the required monomers (usually acrylates, butyl acrylates, etc.), crosslinking agents, emulsifiers, stabilizers, etc.
2. Emulsification:

– Mix water and monomers, usually at the right temperature, to form a water phase.

– Add emulsifiers and stabilizers to the water phase. Emulsifiers help disperse the monomers in the water and prevent them from regrouping.

– Under the condition of mechanical agitation, the water phase and the emulsifier are mixed evenly to form an emulsion.

3. Aggregation:

– Add an initiator (e.g., peroxide initiator) to the emulsion. The initiator causes the polymerization of monomers to form a high polymer.

– As the polymerization reaction proceeds, the monomers will gradually polymerize into polymer chains, which will gradually thicken the emulsion.

4. Cross-linking (optional) :

– If it is necessary to increase the shear resistance and viscosity of the adhesive, an appropriate amount of crosslinking agent can be added. The crosslinker helps to cross-connect the polymer chains, increasing the strength and viscosity of the adhesive.

5. Adjust performance:

– Antioxidants, preservatives, etc. can be added as needed to adjust the properties and stability of the adhesive.

6. Post-processing:

– After the polymerization is completed, the adhesive particles in the emulsion are condensed into colloids by adjusting the pH value and other conditions.

– Water-based emulsion pressure-sensitive adhesive products can be prepared by coating, printing, and other methods to coat the colloid on the required substrate.

The preparation of water-based emulsion pressure-sensitive adhesive requires attention to the ratio, temperature control, stirring conditions, and other factors to ensure the performance and quality of the adhesive. The actual preparation process may vary depending on materials, product requirements, and production scale, so it is best to conduct proper experimentation and optimization before starting production.

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