2022.12.20
Polyurethane materials have excellent performance, which can not only maintain the thermal insulation performance of energy-saving building roofs and exterior walls, but also avoid the leakage of the insulation layer. Some architects say that polyurethane insulation has the good insulation performance of thermosetting foam boards on the outside of the exterior walls, is high in strength, and is very solid. The building insulation market supports the demand for polyurethane foam machines. Therefore, foaming machines occupy a high position in the construction industry.
The foaming of the foaming machine is a complex physical and chemical reaction process, so after the polyurethane foaming machine is foamed, the key control points are mastered, and the fluctuations in the raw materials, mold preheating temperature and aging time selected to eliminate mechanical failures will also directly Affect the quality of the foaming performance of polyurethane foam. If the foaming process is slightly improperly operated, it will lead to wrong liquid bubbles, so we must understand the points after foaming of the production foaming machine:
First of all, we need to know polyisocyanate, polyether, blowing agent, catalyst and foam stabilizer in black and white materials as carriers, which directly determine the chemical reaction and physical properties of polyurethane foam. Selecting qualified foam material enterprises is the basic condition for producing qualified polyurethane foam.
Secondly, the raw material liquid and the injection volume should strictly control the ratio of the black substance, combining polyether and cyclopentane. When the total injected amount is constant, cavitation will appear when the proportion of carbon black is too large. When the proportion of white matter is too large, soft foam will appear. When the proportion of cyclopentane is too large, foam will appear. When the proportion of black and white materials is out of balance, the mixing will be uneven and the foam will be shortened.
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