Use of polyurethane catalyst: It is an upgraded substitute for zinc naphthenate and zinc isooctanoate and is used as a varnish drier and wood preservative. , fabric waterproofing agents, insecticides, fungicides, etc., and also used as driers in polyurethane plastic tracks, waterproof coatings, silicone resins and synthetic rubbers
can be used with Organobismtium and organic zirconium catalysts have obvious synergistic effects.
1. Selection of polyurethane foam catalyst
Polyurethane foam products are mainly composed of polyether, Synthesis of isocyanates, blowing agents, catalysts, etc. The main process of foam formation is generally considered as follows:
1. Foam is generated in the polyurethane reaction system through physical and chemical methods, and the foam is evenly dispersed in the polyurethane reaction system. In the reaction system, the main foaming method is to use water and isocyanate to produce carbon dioxide for foaming.
2. The foam generation process requires the viscosity of the reaction system to increase in order to stabilize the foam and prevent it from escaping.
3. When the foam formation reaches the required number and size, the viscosity of the reaction system needs to continue to increase or even form a cross-linked system to stabilize the foam and shape it into a product.
Notes:
1. Organotin catalyst: in the production of polyurethane products Various organotin catalysts are used in the process, such as dibutyltin dilaurate, etc., which are highly toxic. Care must be taken during operation and must not be swallowed.
2. Amine catalyst: Amine substances are relatively less toxic, but have a strong irritating effect on the skin and eyes. They have low oral toxicity, but due to steam The pressure is low, so be careful not to inhale the air during use.
3.Polyurethane catalyst has certain toxicity, such as many amines The compounds have pungent odors and are also irritating to the skin and eyes. Some heavy metal compounds are highly toxic, so personal protection should be paid attention to when using them. If you accidentally splash on your skin, wash it with soap and rinse with water. If necessary, ask a doctor for help. .
