Are there any workers who work with polyethers?

Polyether blends used in insulation applications for rigid polyurethane foam typically consist of polyether, cell stabilizers, catalysts, blowing agents, flame retardants, and other components. Depending on the type of blowing agent used, they can be classified into several main categories: high-fluorine type, fluorine-free 141b type, and fluorine-free all-water type. Typically, the polyether mixture is a light yellow or brownish-red, viscous, transparent liquid, free of solids, variations in consistency, or unevenness, as well as any mechanical impurities. It is necessary to understand its physical and chemical properties in order to determine the appropriate choice.

This post was last edited by Zhongheng Pump Industry on 2020-8-1 at 10:36. Hello, Haiyou! Rigid foam process: It is produced by reacting rigid polyether polyols (polyurethane rigid foam polyethers, also known as white material) with polymeric MDI (isocyanate, also known as black material). These two materials require two different pumps for transportation. 1. Rigid polyether polyol (polyurethane rigid foam composite polyether, also known as the white material); the viscosity of this medium should be around 2000–5000 cst. Viscosity levels vary depending on the manufacturer, and these values are provided for reference only. A gear pump with high viscosity should be selected; when the viscosity of the medium is high, a pump with a low rotational speed is preferable, as it produces less noise and vibration. 2. Polymeric MDI (isocyanate, also known as black material) has a low medium viscosity and good flowability; its viscosity is in the range of several dozen cSt. However, upon prolonged exposure to air, it will undergo curing. Magnetic gear pumps or magnetic screw pumps (with zero leakage) should be used to avoid the situation where leaks in the shaft seals of conventional pumps lead to solidification, thereby rendering the entire pump unusable. I hope this can help you. If you have any questions regarding pumps, feel free to leave a message or contact us by phone. 13313170275 (same number on WeChat)