Polyurethane systems and Polymeric products

In recent years, research and development department of company in cooperation with reputed research groups outside of company, could produce one of the most important elements of polyurethane systems that is Polyol. Polyol are referred to as polymeric chains containing two or more hydroxyl groups (OH). Usually polyester Polyol and polyether Polyol are used in producing polyurethanes. The Polyol type used in polyurethanes determines their final properties of them. Typically, the Polyols used in the producing of polyurethanes have a molecular weight between 200 and 2000,which are selected depending on the expected final properties of the polyurethane.

 

Polyester Polyols:

Polyester is a molecular chain with a high molecular weight, which Ester molecular group is repeated in their molecular chain that is obtained from the reaction of a carboxylic acid with a diol alcohol. Polyesters used in polyurethane industries are prepared in a variety of ways, most notably are polyestrification and polycaprolactone.

 

Polyether Polyols :

These types of Polyols are typically produced by the polymerization reaction of the epoxyalkylene group in the presence of catalyst such as sodium hydroxide and potassium hydroxide. Polyester Polyols are two-factor or three-factor depending on the method of their preparation.

 

Physical Properties of Polyurethane rigid foam:

 

In a specific system, foam properties can only be controlled by changing the density of polyurethane foam. Physical properties of polyurethane foam such as compressive strength, tensile strength, flexural strength, shear strength and impact strength, thermal conductivity, water absorption rate and elasticity factor greatly depend on the density of polyurethane foam. Some of the general properties of polyurethane foam (rigid foam) polyether or polyester base are:

  • Possibility of forming foam in place of spraying or falling,
  • Diversity in achieving a wide range of physical properties,
  • High strength properties with light weight,
  • Suitable thermal insulation properties,
  • High adhesion to metal, wood, glass and ceramics.

The other elements of Polyurethanes are Isocyanates and Catalysts that Chemical Industry co. imports them too in order to complete the system house needs of customers.

 

Diisocyanates:

Isocyanates are often produced by the reaction of Amine and Phosgene in inert solvents and temperatures below zero to 100 degrees Celsius.  Diisocyanates have two Cyanate groups. The most important Diisocyanates are are TDI (2, 4) – TDI (2, 6) – MDI- HD- XDI

 

Catalysis:

Different type of Catalyst is used for controlling start and finish of Polyurethanes process. The most important Catalysis are acid Catalysis, alkali Catalysis, Mercury  and Zinc.

 

Products and commodities:

 

  •  Polyester Polyol(click here  to see TDS)
  •   Polymeric MDI(MR-200)
  •   Blowing agent
  • Complete system house