R & D, production and sales of various acrylic emulsion , water based adhesive series, waterborne polyurethane dispersion, etc., used in packaging film, waterborne paint, wood paint, waterborne metal anti-corrosion paint, waterborne plastic paint one and two components, leather coating agent, printing ink and light oil, waterborne composite ink adhesion level 0, laminating glue, laminating glue, plywood glue, PVC adhesive, textile stiffening agent, etc. Printing glue, pressure sensitive adhesive PSA, etc. Exchanges and cooperation are welcome

1.Improve water resistance of acrylic emulsion

(1)Utilization of hydrosol

Hydrosol is a polymeric dispersion of very small particles, which has the characteristics of both emulsion system and solution system, and can effectively improve water resistance

(2)Reduce the amount of emulsifier

Although the emulsifier plays an important role in the formation of micelles in polymerization and the stability of the emulsion after polymerization, it is also an important reason for the decrease of water resistance and adhesion. Using special emulsifiers or reducing the amount of emulsifiers can help to improve the water resistance of the emulsion.

2.Improve the adhesive strength (adhesion) of acrylic emulsion

(1)The addition of viscosifying resin

It can significantly improve the 180° peel strength and initial adhesion of the pressure-sensitive adhesive, and there are two ways to add it:

First, blending, using this method to increase the viscosity of the resin must meet three basic requirements:

a.Its molecular weight must be lower than the molecular weight of the adhesive polymer

b.The glass transition temperature of the tackifying resin must be higher than that of the polymer

c.The compatibility of the adhesive resin with the adhesive polymer to be added is betterSecond, before the emulsion polymerization, the tackifying resin is dissolved in the acrylate monomer in advance, and then the emulsion polymerization can also prepare the adhesive with good comprehensive properties.

(2)Select different polymerization methods

If using core-shell polymerization. The core of the polymer uses a harder monomer such as styrene, acrylonitrile, methacrylate, etc., while the shell of the polymer uses a softer alkyl acrylate monomer, so that the polymer emulsion with this structure can greatly improve the cohesion strength of the adhesive.

Special monomer, such as copolymerization of acrylic monomer with appropriate amount of isononyl acrylate (Tg=82℃), can further improve its comprehensive properties.

In order to improve the bonding of alkane materials, vinyl benzoate, tetrahydrofurfuryl methacrylate, cyclohexyl acrylate, 2-phenoxyethyl acrylate and other monomers can be copolymerized with alkyl acrylate to improve the wettability of non-polar bonded bodies and effectively improve the bonding force.

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