Polyacrylate emulsion pressure-sensitive adhesive coating crosslinking agent

Polyacrylate emulsion pressure-sensitive adhesive coating crosslinking agent

A kind of polyacrylate emulsion pressure-sensitive adhesive was prepared by using butyl acrylate and methyl methacrylate as raw materials.

Mainly examines the polymer glass transition temperature (Tg), composite emulsifier sodium dodecyl sulfate/alkyl phenol polyoxyethylene ether (SDS/OP - 10) and crosslinking agent acetoacetic acid base ethyl methacrylate (AAEM) on the pressure sensitive adhesive comprehensive performance and the influence of stripping performance.

The experimental results show that, in the design of Tg = 25 ℃, dosage of emulsifier 2.5% (meter to monomer mass, similarly hereinafter), dosage of AAEM was 1%, the preparation of the pressure sensitive adhesive on the different substrate bonding strength is moderate, can achieve multiple stripping without glue, aging resistance, good effect.

Currently polymerization, prevent air and liquid wax sealing method is usually adopted: add a small amount of the coating in advance appropriate melting point of paraffin wax, wax coating will be in the form of wax coating surface layer, designed to keep out the air.

Contain a wax coating surface without luster, so by sand grinding to remove the wax layer, and then to polished, can be bright luster, most current instruments and high-grade furniture USES this approach. Due to the particularity of the unsaturated polyester coating and wax sealing method, the causes and solutions of the defects in the construction process are different from other kinds of coatings.

Phenomenon: when spraying, can not form the smooth dry paint film surface, the surface of the film presents the concave and convex phenomenon.

Causes:

The construction temperature is high, the gel is quick, the paint film is too late to flush. The wax melting point is low, the float does not come up or the wax adds too little;

The temperature of the substrate is lower than the coating temperature, and the paint film begins to cross the surface.

Local rapid formation of gelation;

When the coating is finished, the coating is shaking and the wax film is broken.

The wet paint film has strong air passage;

The coating is too thick or too thick. Solution:

Reduce the amount of crosslinking agent and promoter, and prolong the gel time; To improve the melting point or waxing of wax;

The substrate temperature should be the same or slightly higher than the coating temperature;




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


After the crosslinking agent is added, ensure that the mixing is well stirred.

When the wax comes out to the gel, do not move the work piece;

The construction environment maintains the air balance;

Reduce the viscosity of the paint and adjust the film thickness.

Phenomenon: the paint film can not be attached to the substrate uniformly, like water sprinkled on wax paper to shrink serrated, round bead shape.

Causes:

The surface is too smooth;

The surface of the substrate is stained with oil, perspiration or spray of compressed air mixed with water or oil;

When the temperature is low, the wax in the coating is precipitated out.

The paint mixed with dust and debris.

Solution:

Pre-coating materials must be beaten;

Ensure that the surface of the substrate is free of grease and sweat stains; The compressed air should be treated by oil and water separator;

When the temperature below 15 ℃, coating, heating place, before use to ensure that the coating of wax dissolves adequately to construction;

The coating is finished and can be used after filtration.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com