Polywin Low Free Prepolymer

2024-12-18

 

Conventional urethane prepolymer contain lots of isocynate isomer, even more than 10% weight ratio, while low-free prepolymer only contain less than 0.5, even less than0.1% free isocynate isomer.

 

Low free urethane prepolymers of Polywin mainly include two major categories: TDI series and MDI series. Within these categories, there are MDI-polyester, MDI-polyether, MDI-PCL，TDI-polyester, and TDI-polyether, etc. All type prepolymer have a wide range of hardness and are suitable for various practical applications in different industries. We also can make PPDI HDI HMDI low-free if customer have special requirement. 

 

Productive Process

In the production process, we use ultra-low pressure extraction technology. By utilizing temperature differences and low pressure, the excess isocyanate is separated from  liquid prepolymer. This effectively controls the free isocyanate content, ensuring product stability and forming an excellent molecular arrangement.

 

Product Processing

Due to the low diisocynate isomer contention in the prepolymer, low-free prepolymer exhibits a longer gel time under the same conditions and easily to handle compare with traditional preploymer. Additionally, viscosity of low-free prepolymer is much lower than that of traditional prepolymer with same NCO valve, especially of MDI prepolymer. Low free diisocyanate products have lower volatility, making them more friendly to operators and the environment, aligning with the concept of an environmentally friendly and green factory.

 

 

Application Advantage

Due to more regular molecular arrangement, Cured polyurethane of low free prepolymer exhibits  better dynamic properties, fatigue durability and phase separation level. So low free polyurethane can make high level seals, wheels, rollers, mining scrapers etc.

Next chart is the compression of tan delta of low free prepolymer and traditional prepolymer. Tan delta is the value of loss modules dived storage modules while material continuous deformation. The lower value means less heat generation while material continuous deformation.

 

                              

 

Conventional urethane prepolymer contain lots of isocynate isomer, even more than 10% weight ratio, while low-free prepolymer only contain less than 0.5, even less than0.1% free isocynate isomer.

 

Low free urethane prepolymers of Polywin mainly include two major categories: TDI series and MDI series. Within these categories, there are MDI-polyester, MDI-polyether, MDI-PCL，TDI-polyester, and TDI-polyether, etc. All type prepolymer have a wide range of hardness and are suitable for various practical applications in different industries. We also can make PPDI HDI HMDI low-free if customer have special requirement. 

 

Productive Process

In the production process, we use ultra-low pressure extraction technology. By utilizing temperature differences and low pressure, the excess isocyanate is separated from  liquid prepolymer. This effectively controls the free isocyanate content, ensuring product stability and forming an excellent molecular arrangement.

 

Product Processing

Due to the low diisocynate isomer contention in the prepolymer, low-free prepolymer exhibits a longer gel time under the same conditions and easily to handle compare with traditional preploymer. Additionally, viscosity of low-free prepolymer is much lower than that of traditional prepolymer with same NCO valve, especially of MDI prepolymer. Low free diisocyanate products have lower volatility, making them more friendly to operators and the environment, aligning with the concept of an environmentally friendly and green factory.

 

 

Application Advantage

Due to more regular molecular arrangement, Cured polyurethane of low free prepolymer exhibits  better dynamic properties, fatigue durability and phase separation level. So low free polyurethane can make high level seals, wheels, rollers, mining scrapers etc.

Next chart is the compression of tan delta of low free prepolymer and traditional prepolymer. Tan delta is the value of loss modules dived storage modules while material continuous deformation. The lower value means less heat generation while material continuous deformation.