Manual batch method This method is a more commonly used method in laboratory and batch production. The commonly used oligomer polyol/TDI/MOCA system operation process is to weigh an appropriate amount of prepolymer in a container of appropriate size, heat it to 80-90°C under stirring, and place it in a...

There are many processing and molding methods for CPU elastomer products, which should be selected according to the shape, quality requirements and processing cost of the product. The production of CPU products is divided into production methods, including manual batch method and mechanical continuous method....

Frequently Asked Questions about Custom Urethane Wheel   Q1: Do you have stocked urethane wheel? A1: No. We only specialize in custom one.   Q2: How can you offer cost for custom urethane wheel? A2: Please provide drawing, hardness, quantity and working environment. The...

The polypropylene glycol used in the polyurethane industry in the past is formed by the ring-opening polymerization of propylene oxide using an anionic catalyst KOH in the presence of polyol or polyamine initiator. Alkali can not only catalyze the formation of polyols from propylene oxide, but also initiate the...

The reaction temperature and time have a significant effect on the rate of prepolymer formation and the chemical structure of the prepolymer. When there is no catalytic reaction, carbamate is mainly formed below 100°C, and urea is also formed when water is present; above 100°C, biuret and allophanate are also...

No matter it is the prepolymer synthesis reaction or various other reactions for the synthesis of CPU, it is related to the acidity and alkalinity in the reaction system. Acid and basic impurities mainly act as catalysts. The acidic medium is conducive to the chain extension reaction to generate carbamate and...

The main factors affecting the quality of prepolymers is whether high-quality raw materials are used to synthesize products. For oligomer polyols, the indicators that should be controlled include hydroxyl value, acid value, moisture, metal impurities, color and unsaturation (PPG), etc. For polyisocyanates, the...

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,...