Polyurethane foaming technology is actually the production of polyurethane foam A technology, this kind of foam can now be used in many fields, such as high-pressure metering pumps and electrical control systems. The key points to note when controlling polyurethane foaming technology have also attracted much attention.
1. Strictly control the properties of the original solution
Black and white materials contain foaming agents, combined polyethers, catalysts and foam stabilizers. Generally speaking, black and white material monomers are viscous liquids and should not contain impurities, otherwise they will clog the filter of the foaming machine and even make the flow of raw materials unstable. During the proportioning process, it should be noted that the proportion of black and white materials must be uniform, otherwise the foaming machine may be blocked.
2. Control the ratio of the original solution
We must strictly control black materials and environmental Pentane ratio. During the proportioning process, if the proportion of black material is too large, cavitation may occur during the foaming process, but if the proportion of white material is relatively large, soft foam may occur. At the same time, if the proportion of black and white materials is out of balance, it will seriously lead to uneven mixing and shrinkage of the foam. This will not happen with the glue produced by Cosmo, because Cosmo focuses on the research of adhesives, provides customized adhesive application solutions, and has rich experience in polyurethane foaming technology.
3. Strictly control the process time
Polyurethane foaming technology is relatively Relatively complex chemical and physical reactions. Therefore, it is very important to strictly control the temperature and curing time of the process. It is recommended that black and white materials be subjected to constant temperature treatment before foaming. The temperature should be between18 degrees to 25 degrees. If the temperature is too low, the black and white materials will have poor fluidity and uneven mixing. The aging time should be controlled well. If the aging time is not enough, appearance deformation will also occur.
Four. Strictly control the injection pressure of the foaming machine
During the foaming process, if the injection pressure is unstable, it will also lead to insufficient mixing of black materials and white materials, or unstable matching. Generally speaking, it should be ensured that the difference between the injection pressure of the white material and the black material is within 5bar, otherwise the material will cross and the foaming machine will be damaged.
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