Catalyst for producing polyurethane plate

Abstract

The invention provides a catalyst for producing a polyurethane plate, which comprises BMCHA and N,N-dimethyl cyclohexane, wherein the weight ratio of the BMCHA to the N,N-dimethyl cyclohexane ranges from 0.8 to 1.5. The two catalysts are not overlaid in function, but are linked up with each other in function, so as to perform foaming functions in a relay manner. After the BMCHA performs the catalysis function to a certain extent, the N,N-dimethyl cyclohexane performs the secondary catalysis function. Through the induction catalysis mode, the foaming process is prolonged, and a flowability problem is solved. The foaming time and the curing time of polyurethane liquid can be accurately controlled through different proportioning of the two catalysts. The invention further provides a method for preparing the N,N-dimethyl cyclohexane used in the preparation of the catalyst. Due to the adoption of the catalysts, the polyurethane liquid with excellent flowability is obtained, a formed plate has complete appearance and excellent foam uniformity, and the polyurethane liquid is particularly suitable for manufacturing a prolonged polyurethane cold storage library plate.

Description

technical field [0001] The invention relates to a catalyst for producing polyurethane boards, and also relates to a preparation method of N,N-dimethylcyclohexylamine in the catalyst. Background technique [0002] With the development of China's economy, various foods needed by people's lives are becoming more and more abundant. Due to the gradual improvement of people's living standards, people pay more and more attention to food quality and food safety. The government is paying more and more attention to the construction and development of food cold chain logistics. Maintaining the quality of perishable food has become the demand of modern social life. Correspondingly, my country's cold storage industry has also developed rapidly in the past ten years. The current cold storage manufacturing is moving from small-scale cold storage to large and medium-sized cold storage. In the construction of large and medium-sized cold storage, the span sometimes reaches 36 meters, so lon...

AI Technical Summary

Problems solved by technology

[0004] Catalysts used in the production of polyurethane usually include: A-1, A-33, BMCHA, 8154, C-225, A-300, PC-41, DMP-30, pentamethyldiethylenetriamine, etc. These catalysts can meet The production of polyurethane sheets within 3 meters, but for polyurethane sheets over 3 meters, due to the poor fluidity of polyurethane liquid, the foaming process is completed before the mold is filled, and enters the curing and aging stage. Therefore, polyurethane The material liquid is rolling and rolling in the cavity of the mold, and the resistance is getting bigger and bigger. When the resistance is large enough, the material liquid will stop rolling, so that the entire cavity of the mold cannot be filled.

Even if the pouring amount is increased and the vent holes are increased, it is impossible to make polyurethane finished products

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