High-aperture-ratio biomass-based rigid polyurethane foam and preparation method thereof

Abstract

The invention provides high-aperture-ratio biomass-based rigid polyurethane foam and a preparation method thereof. The high-aperture-ratio biomass-based rigid polyurethane foam is prepared from, by mass, 100 parts of bio-based polyol mixture, 105-160 parts of polyisocyanate, 1.05-1.4 parts of composite catalyst, 2-6.5 parts of compound foaming agent and 1.5-3.0 parts of foam stabilizer. The obtained product has high aperture ratio, the used foaming agent does not contain halogen, the polyol is the bio-based polyol and is friendlier to the environment, and an auxiliary foaming agent is a boiling range type substance, so that the foaming process is milder and more stable. The polyurethane foam is suitable for making of flower soil and other materials having the higher requirements for the aperture ratio and water absorbability of foam. Steps are simple, operation is easy, and the practicability is high.

Description

technical field [0001] The invention belongs to the field of open-cell biomass-based rigid polyurethane foam, in particular to a high-open-cell biomass-based rigid polyurethane foam and a preparation method thereof. Background technique [0002] Generally, rigid polyurethane foam is closed-cell, and low-boiling substances such as chlorofluorocarbons (such as trichlorofluoromethane, commonly known as CFC-11), carbon dioxide, etc. are closed in the pores as blowing agents. Due to the good thermal insulation effect, low density and high specific strength of closed-cell rigid polyurethane foam, it is widely used in the insulation layer of refrigerators and freezers, insulation materials for buildings, storage tanks and pipelines, and non-thermal insulation applications such as imitation wood and packaging materials. . [0003] However, some new application fields, such as flower mud, etc., require rigid polyurethane foam to have a higher open cell ratio, so as to have a higher ...

AI Technical Summary

Problems solved by technology

However, there are the following defects in practical application: CO 2 The thermal conductivity of the gas phase is as high as 16.3mW / m·k, and the thermal insulation performance of the prepared foam is not good; the CO in the foam 2 If the gas diffuses out too fast, the dimensional stability of the foam will decrease; the fluidity of the all-water foaming system will be poor, the consumption of more isocyanate will increase the production cost, the prepared foam will be brittle, and the bonding performance will be poor.

Images