Polyurethane and preparation process thereof

Abstract

The invention relates to the technical filed of foam production, in particular to polyurethane and a preparation process thereof. In the preparation process, the water of combined polyether reacts with isocyanate to produce carbon dioxide, the carbon dioxide is not an ozone-depleting substance (ODS), and a catalyst promotes the isocyanate and polyether to form a polymer, so that the pore forming performance of the polyurethane is formed, the polyurethane does not produce a bulge phenomenon after being subjected to high temperature, and high temperature resistant performance is formed. The polyurethane has the enough pore-forming performance, the density of the polyurethane can be lower, and accordingly the dimensional stability of the polyurethane is improved. The polyurethane is resistant to high temperature and has good dimensional stability. When the preparation process does not adopt CFCs and HCFCs foaming agents, no ODS or ODP is used for the raw materials and is not used in the production process, an ozone layer in the atmosphere is not damaged, the environment is effectively protected, and the polyurethane meets the limiting value requirements of revised directive 2011 / 65 / EU appendix II of EU RoHS directives 2008 / 95 / E, does not contain cadmium, lead, mercury, hexavalent chromium, polybrominated biphenyls (PBBs), polybrominated diphenyl ethers (PBDEs) and other harmful substances and is an environmentally-friendly product.

Description

technical field [0001] The invention relates to the technical field of foam production, in particular to a polyurethane and a preparation process thereof. Background technique [0002] Polyurethane is the abbreviation of polyurethane, and any polymer compound containing many repeated -NHCOO- groups on the main chain of the polymer is generally called polyurethane. [0003] Polyurethane foam has a wide range of applications and has penetrated into almost all sectors of the national economy, especially in furniture, bedding, transportation, refrigeration, construction, heat insulation and other sectors, and has become one of the indispensable materials. One of the varieties with the widest range of applications. [0004] Rigid polyurethane foam refers to a foam that will not deform significantly under a certain load, and cannot return to its original shape after being deformed when the load is too large; rigid polyurethane foam has the characteristics of light weight, high st...

AI Technical Summary

Problems solved by technology

[0012]Although rigid polyurethane foam has the above advantages, its high temperature resistance is poor, and it will produce obvious swelling phenomenon above 120-140°C. Once the high-quality polyurethane foam is deformed, it is irreversible; the traditional process of producing polyurethane foam doors (using polyurethane foam as the inner filler of the door panel) is to use the process of spraying and then foaming after the door panel is formed, to avoid the high temperature caused by the spraying process. The door body will be deformed after foaming, and the foam extrusion / leakage during the foaming process will inevitably pollute the surface of the door panel, seriously affecting the appearance quality of the finished door panel, because the foam and the door panel have good bonding performance, which will be difficult for later cleaning. work brings problems