The stability adhesive emulsion is related to color fastness. Emulsion particles should be controlled in the 0.2μm, and its particle size distribution should be uniform, and there are not both the big particles and small particles, or the friction fastness will be reduced, and the method to determine the quality of adhesive sealant is to observe the appearance of the emulsion, and the particles in the white emulsion illustrate are larger, which are at least 5 μm or more, the emulsion with the described yellow particles is very uneven, generally the particles are at least more than 2μm, and the emulsion with blue particles is around 1μm, and the ideal adhesive should be blue translucent emulsion, which is not milky, indicating the size of the particles are in the 0.2-1μm, and the particle size distribution range is narrow.
Improve the adhesive rubbing fastness
The rubbing fastness of pigment printing is the most troublesome. In the used printing paste, some factories add organic silicon, but the effect was not significant. Some people think that this is caused by the uneven coating particle size, it was also considered to be caused by the adhesive, use polyurethane adhesive rubbing fastness of the same coating can be qualified and unqualified acrylate adhesive, and the use of different matching adhesive its situation is different. Of course, the coating particles bring some affects, when the particle diameter is large, and the crystal form and particle size distribution uneven course rubbing fastness will reduce, but under the same circumstances in the coatings, Heat Sink Paste play a decisive role. The main factors affecting rubbing fastness is the coefficient of friction of the coating, and the rich than a low content of the smoothness of the film to its friction with high fastness, and the fastness of polyacrylate adhesive with the high content of the soft monomer is poorer than the one with less content.
Three ways to solve the rubbing fastness
The aids increasing friction fastness are added in the paste, which is a silicone elastomer, or an oxidized polyethylene emulsion, the amount is greater than 5%, less ineffective, its purpose is added the substance with the smoothing effect to the film. It can be used together with the polyurethane adhesive to improve the performance of the film by the polyurethane. The new copolymer which is made of acrylate and silicone monomer is the existing product.
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