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Organotin catalyst is one of the indispensable raw materials for the production of polyurethane
Edit:Nantong Yutai Chemical Products Co., Ltd.   UpDate:2019-05-31

A brief history of polyurethane development

The first report of the related organotin catalysts originated from the reaction between an isocyanate and a hydrocarbon-based compound of Wurz and Hoffmann in 1849. However, it was not until 1937 that Otto Bayer began to industrialize the above-mentioned reactants, so the industry began to study polyester-based polyurethanes, competing with nylon. Until now, polyurethanes have been used to produce fibers, coatings, and foams, which are widely used in the home, shoe, construction, automotive, and other industries, and continue to expand applications.

What is polyurethane?

The polyurethane is basically a polymerization reaction product of a hydroxyl polymer such as a polyether polyol and an isocyanate, and is a polymer containing a urethane bond. Polyurethane is different from other polymers, such as polyethylene, polystyrene and polyvinyl chloride, which are ethylene, styrene and vinyl chloride linked polymers, respectively, while polyurethane does not have multiple identical urethane units. In a way that is polymerized, it is usually not possible to represent all polyurethanes with a common empirical formula.

Introduction to Polyurethane Chemistry

The basic reaction of the polyurethane is between the isocyanate compound and the compound containing an active hydrogen.

Isocyanates are compounds having one or more highly reactive isocyanato groups.

Active hydrogen generally refers to hydrogen combined with a negatively charged yard, such as nitrogen, oxygen, sulfur or chlorine.

 

       Gelling reaction: The reaction of an isocyanate with an alcohol produces a carbamate. If such a simple addition reaction is extended to a difunctional or polyfunctional reactant, a complex compound generally referred to as a polyurethane can be obtained.

      Foaming reaction: To make a foam, a nucleus must be produced inside the gelled compound, and foaming can be obtained by one or two methods.

Physical blowing agent: It is usually evaporated with a heat of reaction using a solvent having a low boiling point. Such as: dichloromethane.

Chemical blowing agent: It chemically reacts with isocyanate to produce gaseous products. Such as: water.

Raw materials for the production of polyurethane:

· Isocyanate

· Polyol or similar polymer

· Water

· Physical foaming agent

· Amine catalyst

· Organic tin catalyst

· Silicone surfactant

· Other functional additives:

· Dyes

· Plasticizer

· Flame retardant

· Reagent

Different polyurethane additive series contribute to improved process efficiency and foam performance in polyurethane foam formulations.


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