solvent-free compound/and solvent-based dry composite technology

The difference between the solvent-free compound and the solvent-based dry type is mainly reflected in the formation mechanism of the film and the complex fastness, the coating method, the function and requirements of each process.

Table 1 solvent-free and dry composite process technology on the principle of the difference:

Project or indicator Solvent-free compound Dry composite
Coating method Multi-roll transfer coating;

Glue thin, uniform thickness;

The coating amount is mainly determined by the rotation speed of each roller, which can be adjusted steplessly

Roll coating;

Thicker layer, for the bump (crest) -like, uneven thickness;

The amount of coating is mainly determined by the number of recessed roller lines, can only replace the concave roller limited adjustment

Film and compound fastness · Low initial viscosity

Film and composite fastness are basically formed in the machine outside the curing process;

The film is formed primarily as a chemical process for two component reactions

· After the oven heating, the initial viscosity is high

· Film and composite fastness mainly in the machine formation, curing process only play a supporting role;

The formation of the film is mainly dry and volatile and composite pressure of the physical process

Dry and cool · No need to dry

One-component glue needs to be cooled, and two-component glue is generally not required to cool

· The necessary process;

Drying is usually high temperature, and each section of the drying temperature and cooling temperature have a greater impact on the composite

Curing For critical processes, curing temperature and time on the reaction of bicomponent glue and thus have a significant impact on the composite quality Usually for the auxiliary process, temperature and time on the composite quality have a certain impact