Synthesis process of prepolymer The synthesis process of prepolymer can be divided into laboratory method and industrial production method. The latter has manual batch method and mass production method. They will be introduced separately below. (1)   Laboratory method  ...

Prepolymer synthesis Formulation design Different application fields have different requirements for product performance, and the performance of the product depends on the raw materials and their ratio and processing technology. Therefore, before making CPU products, the qualified raw materials should...

The moisture content of oligomeric polyols should be less than 0.05% no matter how to produce CPU products. If the value is higher than this value, the dehydration operation should be carried out. The most commonly used methods are intermittent water removal, continuous spray dehydration and continuous membrane...

In recent years, urethane materials have been widely used because of their higher strength. Rubber and polyurethane materials, because of their high elasticity, good wear resistance, sound insulation and damping characteristics, are used in automobile, ordnance, aerospace, chemical industry and other damping and...

Casting polyurethane roller is a kind of roller made by pouring liquid polyurethane rubber. Compared with ordinary rubber rollers, it has higher mechanical strength (2-3 times of natural rubber), excellent wear resistance (5-10 times of natural rubber), outstanding compression resistance; wide range of hardness,...

Polyurethane bushing is a ring sleeve that acts as a gasket. In the valve application field, the bushing is in the valve cover, and generally uses corrosion-resistant materials such as polytetrafluoroethylene or graphite for sealing.   Function of polyurethane bushing   The valve...

If the isocyanate index (NCO / OH) is greater than 2, there will be excess isocyanate monomer in the prepolymer. If NCO / Oh ≫ 2, the product is actually a mixture of isocyanate terminated prepolymer and isocyanate monomer. This mixture is called a semi prepolymer.   The semi prepolymer method...

Polyurethane bushings are manufactured at Pepsen from 2004 when rubber bushings were widely replaced by polyurethane bushings in China. Our durable custom polyurethane bushings can be molded or machined depending on hardness, quantity and shape. Polyurethane bushings have been widely used in vibration isolation...

According to the synthesis process of CPU elastomer, it can be divided into one-step method and two-step method, the latter is also called prepolymer method, and prepolymer method can be divided into prepolymer method and semi prepolymer method. Prepolymer method is to synthesize prepolymer...

Raw materials and compounding agents of polyurethane CPU is prepared by reaction of oligomer polyol, polyisocyanate and chain extender. Polyester and polyether are commonly used as oligomer polyols. Polycaprolactone is rarely used, while polybutadiene, polycarbonate and other polyols are...

Polyurethane elastomer (CPUE), referred to as casting polyurethane (CPU) or polyurethane pouring resin. "Pouring type" refers to a kind of chemical processing method in which the material system of the product is liquid before molding, which can be poured and solidified directly, and the material system does not...

Application of polyurethane elastomer 2 6.2.2 Injection, extrusion, molding and calendering products TPU particles and MPU glue are mainly used for extrusion, injection and molding of small and medium-sized molded products, while TPU is more used for extrusion molding of wire and cable sheath,...