Polyurethane sandwich panel and preparation method thereof

Abstract

The invention relates to a polyurethane sandwich panel and a preparation method thereof, which belong to the technical field of polyurethane foaming materials. The polyurethane sandwich board comprises an outer-layer artificial board, an inner-layer artificial board and a polyurethane foaming layer arranged between the outer-layer artificial board and the inner-layer artificial board. The polyurethane foaming layer comprises the following components in parts by weight: 100 parts of lignin modifier, 50-300 parts of polyether polyol, 1-10 parts of amine catalyst, 10-100 parts of foaming agent and 2-18 parts of surfactant. The surfactant is a mixture of polyvinyl pyridine-polydimethylsiloxane and polydimethylsiloxane in a weight ratio of 1: 1.5. The binding capacity with polyurethane is improved through the lignin modifier, meanwhile, dispersion of the lignin modifier in polyisocyanate is further enhanced through the surfactant, the binding capacity of the lignin modifier and polyisocyanate is improved, synchronous bonding is achieved in the foaming and curing process, and the biomass substitute type high-strength artificial board sandwich panel is obtained.

Description

technical field [0001] The invention relates to the technical field of polyurethane energy-saving materials, and specifically provides a polyurethane sandwich panel and a preparation method thereof. Background technique [0002] In construction sites, disaster relief sites and some temporary places, temporary board houses are often used. Building board houses requires light weight and strong building material boards that can be quickly assembled, and also have heat insulation, sound insulation and fire protection functions. . In the prior art, there is a fiber cement foam composite board, which is composed of a layer of foam plastic and a layer of fiber cement board, but has low impact strength and poor weather resistance; The strength and shear resistance of plastic composite panels have been improved to a certain extent. [0003] The composite plate includes a polyurethane foam layer, but in the prior art, a large amount of petroleum-based polyols are used in the polyure...

AI Technical Summary

Problems solved by technology

In the prior art, there is a fiber cement foam composite board, which is composed of a layer of foam plastic and a layer of fiber cement board, but has low impact strength and poor weather resistance; Plastic composite board, its strength and shear resistance have been improved to a certain extent

[0003] The composite board includes a polyurethane foam layer, but a large amount of petroleum-based polyols are used in polyurethane foam materials in the prior art, causing environmental pressure

In the prior art, the polyol solution of lignosulfonic acid or its partially neutralized salt is polycondensed with polyisocyanate, and the modified lignin component is used to replace petroleum-based polyol, but its binding ability with polyurethane is poor, resulting in The strength of the prepared sandwich panel is poor