Online premixing system for polyurethane insulation board raw materials

Abstract

An online premixing system for polyurethane insulation board raw materials comprises a feeding unit, a stirring unit and a material conveying unit. The feeding unit comprises a polyhydric alcohol supply tank and an isocyanate supply tank. The stirring unit comprises a V-shaped stirring bin, and the V-shaped stirring bin is formed by enabling two stirring cylinders to be communicated. First stirring shafts are arranged in the two stirring cylinders in the length directions of the cylinders. A perforated plate is arranged at the joint of the bottom of the V-shaped stirring bin and a dischargingpipeline. A driven stirring impeller is arranged on the perforated plate. The material conveying unit comprises a material conveying cylinder and a second stirring shaft, and second stirring blades and spiral conveying blades are sequentially arranged on the second stirring shaft at intervals. The two inclined stirring cylinders are arranged, and the first stirring shafts are arranged in the stirring cylinders, so that premix forms rotational flow in opposite directions above the V-shaped stirring bin, then fluid drives the driven stirring impeller to rotate, turbulent flow is formed below theV-shaped stirring bin, the online mixing speed of raw materials is increased, and the working efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of polyurethane production equipment, and more specifically to an automatic batching and feeding system of a concrete mixing station. Background technique [0002] Polyurethane, the full name of polyurethane, is the general name of macromolecular compounds containing repeating carbamate groups on the main chain; it is made by addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compound ; Due to the different structure of polyurethane, the performance is also different; using this property, polyurethane polymers can be made into plastics, rubber, fibers, coatings, adhesives, etc.; especially the development of polyurethane foam is extremely rapid; foam plastic is a polyurethane synthesis One of the main types of materials, rigid polyurethane foam is made of polyols, isocyanates and various additives. Its cells are mainly closed cells. When a blowing agent is used, the foa...

AI Technical Summary

Problems solved by technology

[0003] The foaming time of polyurethane is generally short. It is necessary to mix polyester polyol or polyether polyol with isocyanate evenly before foaming. Among them, polyester or polyether generally has a high viscosity at room temperature. In addition, the synthetic temperature of polyurethane Generally around 90°C, so polyester generally needs to be preheated before synthesis before synthesis, but polyester or polyether generally has a certain viscosity near 60°C, and direct foaming will easily cause uneven mixing, so It is necessary to set up an online premixing device to pre-mix polyester polyol or polyether polyol with isocyanate online

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