Production process of polyurethane screen plate
Our company is a well-known polyurethane screen enterprise. It has always established a good corporate image with a sound management system and has been well received by people from all walks of life. The following Xiaobian will introduce you to the production process of polyurethane screen.
1. Synthesis of prepromers
①. Raw materials, oligomer polyols: ODX2218, CMA21024; polytetra-methylene glycol (PTMG 1000), dehydrated before use, so that the water content is less than 0.05%.Polyisocyanate: toluene diisocyanate (TDI2100).
②. Synthesis of prepromers. The dehydrated oligomer polyol is cooled to 40℃～60℃, added to the reactor, and the measured toluene diisocyanate is added under constant stirring. After the reaction is 30 min～40 min, it is slowly heated to (80±) ℃, and the reaction continues for 2 h～3 H.Sampling and analysis —5NCO%, reaching 4. 0 %～ 5. At 0%, the prepomer was obtained by vacuum defoaming for 30 minutes at 0.8kPa.
2. Pouring process
①. Pretreatment of metal skeleton In order to ensure that the polyurethane screen has a certain stiffness during use, the screen is usually lined with a steel skeleton.The steel skeleton of small and medium-sized screens is mostly welded frame structure, while tension screens use multi-strand wire ropes as the skeleton.In view of the complex working environment, the surface of the metal skeleton must be sandblasted to remove oil stains and rust stains on the surface, activate the surface, and expand the bonding area.
②. The assembly of the mold. After the steel mold is surface demoulded, it is placed in the skeleton, and the platform temperature rises to 110℃.
3. Pouring chain extender for polyurethane screen plate: dichloro, diaminodiphenylmethane (MO2 CA).Due to different production conditions, the specific pouring methods are divided into two types: manual pouring and mechanical pouring.
Our company has always adhered to the entrepreneurial spirit of people-oriented, meticulous carving, self-transcendence, and continuous innovation, and adheres to the operating philosophy of “quality, innovation, and perfection” to provide customers with high-quality products and perfect service. We look forward to cooperating with you and welcome your arrival.
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