Supply of polyurethane spraying machines in Fuzhou, Fujian in 2016

电源：

380V 50HZ

加热功率：

10000

最大输出压力：

11MPa

The rigid foam polyurethane spraying technology of Fuzhou, Fujian polyurethane spraying machine is difficult to master and is prone to problems such as uneven sprayed polyurethane cells. The training of spray construction personnel should be strengthened to make them proficient in spraying technology and able to independently solve technical problems encountered in spraying construction. The key technical issues that need to be solved in spray construction mainly include the following aspects. Control of milky time and atomization effect The formation of polyurethane foam needs to go through two stages: foaming and maturation.
From the beginning of mixing black and white materials to the stop of foam volume expansion, this process is called foaming. During the foaming process, the system releases a large amount of reaction heat. When using the ester spraying process, the uniformity of the cells should be considered. The uniformity of cells is mainly affected by the following factors
Material ratio deviation
There is a big difference in density between machine foaming and manual foaming. Usually, the fixed material ratio of the machine is: However, due to the large difference in viscosity of white materials from various manufacturers, the actual material ratio does not match the fixed material ratio of the machine. When the white material is excessive, the foam density is low, the color is whitish, the foam strength is reduced, the hand feels soft, and it is easy to shrink when the temperature is low. When the black material is excessive, the foam density is high, the color is dark, the foam strength is high, and the hand feels hard and brittle. In these cases, the material ratio should be checked immediately to see whether the filter is clogged and whether the pressure and temperature indicators are normal to ensure the accuracy of the black and white material ratio.
Ambient temperature
Polyurethane foaming is greatly affected by temperature. Foaming relies on heat. Without heat, the foaming agent in the system cannot evaporate, and foam cannot be generated. Heat comes from two aspects: chemical reaction production and environmental supply. The heat of chemical reaction is not affected by external factors, and the heat provided by the environment changes with changes in ambient temperature. When the ambient temperature is high, the environment can provide heat to the reaction system, which can increase the reaction speed and shorten the reaction time. It shows that the foam is fully foamed, and the density of the foam surface and core is close to each other. When the ambient temperature is low (such as below ℃), part of the reaction heat will be dissipated into the environment. The loss of heat, on the one hand, prolongs the foam maturation period and increases the foam molding shrinkage (the lower the temperature, the higher the molding shrinkage). On the other hand, it increases the amount of foam material used. Experiments show that for the same foaming material, the foaming volume at ambient temperature of ℃ is % smaller than that at ℃, thus increasing the production cost of foam.