Modified polyol and preparation method thereof, and modified polyurethane material and preparation method and application thereof

Abstract

The invention provides a modified polyol and a preparation method thereof, and a modified polyurethane material and preparation method and application thereof. The modified polyol includes a polyol matrix and micro-nano lignocellulose dispersed in the polyol matrix; the polyol matrix is selected from polyester polyol and / or polyester polyol. Micro-nano cellulose contained in the micro-nano lignocellulose provided herein has a large amount of hydroxyl radicals which may form binding sites with the polyol matrix; therefore, the micro-nano lignocellulose can be well dispersed in the polyol matrix, and the polyurethane material prepared with the polyol as a matrix is enhanced and toughened.

Description

technical field [0001] The invention belongs to the field of polyurethane composite materials, and relates to a modified polyol and a preparation method, a modified polyurethane material, a preparation method and an application. Background technique [0002] Polyurethane composite materials are very good materials in recent years. Due to the excellent elasticity of polyurethane resin, polyurethane fiber composite materials have far superior toughness to phenolic and epoxy resin substrates, but the performance of composite materials still needs further improvement. Improvement, polyol is one of the main raw materials for synthesizing polyurethane resin or polyurethane material, and the performance of polyurethane material can be further enhanced by modifying polyol or other raw materials. [0003] Nanocellulose has received more and more attention due to its wide range of sources and excellent properties. Nanofiber materials such as nanocellulose and wood nanofibers with a c...

AI Technical Summary

Problems solved by technology

Nanofiber materials such as nanocellulose and wood nanofibers with a certain length-to-diameter ratio are prepared by treating raw materials such as cellulose and lignocellulose, and these nanofiber materials can not only be used as reinforcing materials for resin composites, It can also reduce the thermal expansion of the resin, but due to the poor dispersion and easy agglomeration of nanocellulose in the resin matrix such as polyurethane, it will reduce the mechanical properties of resin such as polyurethane

[0004] CN101845146A discloses a formula and preparation method of enzymatic lignin-modified polyols, mixing polypolyol, glycerol, and acid catalyst formula evenly, adding enzymatic lignin to heat up the reaction, and then adding an alkali regulator to adjust the solution pH, then dialysis and vacuum distillation to obtain the product, which can be directly used in the synthesis of polyurethane. A large amount of chemical reagents are used in the preparation process, which is not environmentally friendly, and the preparation process is complicated; CN102731990A discloses a reinforced polyurethane imitation wood material and Its manufacturing method is to directly mix and mold nanocellulose, isocyanate, polyether polyol and auxiliary agents according to a certain ratio through a one-step molding method to obtain a polyurethane imitation wood material, but there is a problem of dispersion of nanomaterials; CN107298842A discloses a cationic The method of nanocellulose modified water-based polyurethane emulsion, by preparing cationic nanocellulose and then mixing with polyurethane, first needs to prepare cationic nanocellulose, the operation is complicated, and it is directly mixed with polyurethane, and there is also the problem of poor dispersion of nanomaterials. Problem; CN107686549A discloses a kind of high-performance polyurethane and its preparation method and application, take polyether polyol and polyisocyanate as main raw material, add a certain amount of nano-cellulose crystal and nano-hydroxyapatite, in blowing agent Under the action of stabilizers and catalysts, chain growth reactions, gas production and crosslinking reactions occur to obtain high-performance polyurethanes. A large amount of chemical reagents are used in the process, which is not environmentally friendly.

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