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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 |