The preparation method that is rich in papi polyurethane high resilience foam material

Abstract

The invention relates to a preparation method of a polyurethane high-resilience foam material rich in PAPI (polymethylene polyphenylisocyanate). The preparation method comprises the following steps: stirring a component A and a component B in a reaction kettle of a high-pressure foaming agent for at least one hour respectively, heating a foam mold to 50-70 DEG C, uniformly spraying a demolding agent on the inner wall of the foam mold, performing high-pressure mixing on the component A and the component B by the foaming machine according to the ratio in parts by weight of 100: (50-70), then pouring the obtained mixture into a mold, performing mold closing, curing for 3-8min, and then sequentially demolding and trimming to obtain a finished product. The preparation method provided by the invention has the advantages that a raw material containing multiple active hydrogens is taken as a starting agent, a polyol prepared by high-temperature polymerization reaction of propylene oxide (PO) and ethylene oxide (EO) is taken as a modifier, and the foaming reaction sequence of foam which is mainly based on an MDI (diphenylmethane diisocyanate) base (PAPI) is regulated, so that the foaming reaction is relatively balanced, the distribution of soft and hard sections is relatively reasonable, the prepared foam which is mainly based on the MDI base (PAPI) has great high resilience, high foaming rate, high extension rate and high tear strength; and more importantly, the foam material prepared by using the formula has good tactility.

Description

technical field [0001] The invention relates to the technical field of foam material production, in particular to a method for preparing a PAPI-rich polyurethane high-resilience foam material. Background technique [0002] Traditional polyurethane high-resilience foam is mainly based on TDI, and its products have good mechanical properties, but the cost is high, and it has a certain impact on the environment and occupational health and safety. Although MDI-based (PAPI)-based polyurethane high-resilience foam has cost advantages and contributes to the environment and occupational health and safety, it has a low expansion ratio, poor rebound, elongation, and tear strength, and it is difficult to reduce it. Densification, so its production method needs to be improved. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing a PAPI-rich polyurethane high-resilience foam material with high expansion rat...

AI Technical Summary

Problems solved by technology

[0002] Traditional polyurethane high-resilience foam is mostly based on TDI, and its products have good mechanical properties, but the cost is high, and it has a certain impact on the environment and occupational health and safety.

Although MDI-based (PAPI)-based polyurethane high-resilience foam has cost advantages and contributes to the environment and occupational health and safety, it has a low expansion ratio, poor rebound, elongation, and tear strength, and it is difficult to reduce it. density, so its production method needs to be improved

Images