The amount of PMI foam alcoholysis agent is fast for alcoholysis, but the amount of alcoholysis agent is different When the ratio of waste material reaches 1:1, the reaction speed of alcoholysis agent will not increase much when the alcoholysis agent is increased., have high catalytic efficiency and are beneficial to the dissociation of urethane bonds to generate amines and carbon dioxide. The reaction rate is lower than that of hydrolysis and pyrolysis, and waste materials are allowed to contain other impurities, such as polyurethane or polyamide fibers, polycarbonate and polymethanol. The upper layer is distilled to obtain polyols, which can be directly used to re-produce polyurethane foam.PMI foam'>Recycling of PMI foam chemical methods: 1. Alcohol compounds are decomposing agents. There are two main types of bond scission, namely cN The bond breaks and the C-() bond breaks to produce polyols or polyols and amine-terminated-hydroxyl-terminated polymers.Under the same conditions, the amount of catalyst is fast for alcoholysis. Alcoholysis is the most researched method among all the chemical methods for recycling polyurethane waste. When adding non-polar solvents (esters or halogens) to the degradation products of PMI foam In the case of hydrocarbon substitution) and water, the degradation products are divided into two layers. The catalyst used for the alcoholysis reaction is dilaurel Alkaline catalysts such as dibutyltin acid, tetrabutyltitanium, triethylenediamine, sodium hydroxide, potassium acetate, etc. Polyethylene glycol diols are used as alcoholysis agents for polyurethane wastes. Under heating, polyurethane waste is decomposed into polyether polyols, which is the alcoholysis method.PMI foam, PMI foam manufacturer, PMI foam price What are the performance advantages of PMI foam boxes in the construction of mesh rock wool core foam plastic. For rigid polyurethane foams, it is more suitable for alcoholysis processing, which is characterized by mild alcoholysis conditions. The lower layer is concentrated, crystallized, recrystallized or vacuum distilled diamines, China wave-transmitting foam and phosgene can be added to generate isocyanates The disadvantage is that because the reaction is carried out under high temperature and strong alkali conditions, it requires high equipment, high production costs, and difficult industrialization. The alcoholysis reaction is related to the catalyst used. The alkali degradation method is based on MOH (M is Li, One or more of K, Na, ca) is a degrading agent, which degrades rigid polyurethane foam into oligomers at about 160-200°C. The average molecular weight of alcoholysis product decreases. The rate of alcoholysis and the chemistry of waste materials The composition, catalyst, reaction temperature, reaction time, type and amount of alcoholysis agent are related. The technology is relatively mature and has formed a certain industrial scale. At moderate temperature or Moderate stun/catalyst and under the protection of inert gas, the degradation product is stable, the composition is relatively simple, and it is easy to separate and purify
