Our company is a well-known polyurethane screening board enterprise. All along, we have established a good corporate image with a sound management system and received unanimous favorable comments from all walks of life. The following Xiaobian will introduce the production technology of polyurethane screen panels to everyone.
1, the synthesis of prepolymers
1. Raw material, oligomer polyol: ODX2218, CMA21024; polytetramethylene glycol (PTMG 1000), dehydration treatment before use, so that the water content is less than 0.05%. Polyisocyanate: Toluene diisocyanate (TDI2100).
2, the synthesis of prepolymer The dehydration of the oligomer polyol is cooled to 40 °C ~ 60 °C, was added to the reactor, stirring continuously added to measure the good toluene diisocyanate, the reaction after 30 min ~ 40 min, slowly Heating to (80 ±) °C, continue the reaction 2 h ~ 3 h. Sampling analysis - 5NCO%, when 4.0% to 5.0%, vacuum defoaming at 0.8kPa for 30min to get prepolymer.
2, pouring process
1. Pretreatment of metal skeleton In order to ensure that the polyurethane screen plate has a certain degree of rigidity during use, it is usually lined with a steel frame inside the screen plate. The steel skeletons of small and medium-sized sieve plates are mostly welded frame structures, while the tension sieves are mostly made of multi-strand steel wire ropes as skeletons. In view of the complex working environment, the surface of the metal skeleton must be sandblasted to remove the surface oil stains, rust stains, activate the surface, and expand the bonded area.
2. Assembly of the mold After the surface of the steel mold is demolded, it is placed in the frame and the temperature of the platform is raised to 110 °C.
3. Casting polyurethane screen plate Chain extender: Dichlorodiamino diphenylmethane (MO2 CA). Due to different production conditions, the specific pouring method is divided into two types, manual pouring and mechanical pouring.
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