Views:3 Author:Site Editor Publish Time: 2021-03-08 Origin:Site
The foaming produced by the high-pressure foaming machine is a relatively complex physical and chemical reaction process. Therefore, it is very important to grasp the control points of the polyurethane high-pressure foaming machine after foaming. Eliminate mechanical failures, select raw materials, molds, preheating temperature and The fluctuation of the curing time will also directly affect the performance requirements of the high-pressure foaming quality of polyurethane foam. If there is a slight improper operation, the incorrect foaming process will cause cavitation, so we must know the precautions after the high-pressure foaming machine produces foam :
First of all, we must understand the chemical properties of polyisocyanates, combined polyethers, blowing agents, catalysts and foam stabilizers in black and white materials that directly determine the chemical reactions and foam physical properties of synthetic polyurethane. Need to purchase outsourcing to choose well-known foaming material companies, foaming material is the basic condition for the production of qualified polyurethane foam.
Secondly, it is necessary to strictly control the proportion of the stock solution and the injection volume to control the proportion of black material, combined polyether and cyclopentane. When the total injection volume is unchanged, if the proportion of black material is too large, cavitation will appear, if the proportion of white material is too large, soft bubbles will appear, if the proportion of cyclopentane is too large, bulging bubbles will appear, and if the proportion is too small, cavitation will appear. The proportion of black and white materials is out of balance, resulting in uneven mixing and shrinkage of foam.