Polyurethane sandwich panel and preparation method thereof

A polyurethane sandwich panel and polyurethane technology, applied in the direction of chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as poor bonding ability, low impact strength, and environmental protection pressure, and achieve improved bonding Ability, improve dispersion performance, avoid the effect of using adhesive

Pending Publication Date: 2021-04-23
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A polyurethane sandwich panel and a preparation method thereof, comprising:

[0025] Step 1: Preparation of modified lignin: react straw lignin material, polyol and acid catalyst at 100-135°C for 1 hour, then add starch at 60-100°C and react for 1 hour to obtain modified lignin 100 parts by weight of the straw lignin material, 150 parts by weight of starch, 160 parts by weight of polyol, and 2 parts by weight of acidic catalyst. The particle size of the straw lignin material is 10-200 mesh; the polyhydric alcohol is ethylene glycol; and the acidic catalyst is acetic acid.

[0026] Step 2: Mix the modified lignin, polyether polyol, amine catalyst, foaming agent and surfactant evenly, place between the outer wood-based board and the inner wood-based board, and then according to the isocyanate index 1.1 Add isocyanate to react, the reaction temperature is 15-30°C, the reaction time is 1 minute, and the product obtained by the reaction is cured to obtain a polyurethane foa...

Embodiment 2

[0030] A polyurethane sandwich panel and a preparation method thereof, comprising:

[0031] Step 1: Preparation of modified lignin: react straw lignin material, polyol and acid catalyst at 100-135°C for 4 hours, then add starch at 60-100°C and react for 0.5 hour to obtain modified lignin 100 parts by weight of the straw lignin material, 150 parts by weight of starch, 120 parts by weight of polyol, and 2 parts by weight of acidic catalyst. The particle size of the straw lignin material is 10-200 mesh; the polyhydric alcohol is ethylene glycol and polyethylene glycol; the acidic catalyst is a mixture of acetic acid and oxalic acid.

[0032] Step 2: Mix the modified lignin, polyether polyol, amine catalyst, foaming agent and surfactant evenly, place between the outer wood-based board and the inner wood-based board, and then according to the isocyanate index 1.4 Add isocyanate to react, the reaction temperature is 15-30°C, the reaction time is 5 minutes, and the product obtained ...

Embodiment 3

[0037] A polyurethane sandwich panel and a preparation method thereof, comprising:

[0038] Step 1: Preparation of modified lignin: react straw lignin material, polyol and acidic catalyst at 100-135°C for 2 hours, then add starch at 60-100°C and react for 1 hour to obtain modified lignin 100 parts by weight of the straw lignin material, 120 parts by weight of starch, 140 parts by weight of polyol, and 1 part by weight of acidic catalyst. The particle size of the straw lignin material is 10-200 mesh; the polyhydric alcohol is ethylene glycol and polyethylene glycol; the acidic catalyst is a mixture of oxalic acid, malonic acid and succinic acid.

[0039] Step 2: Mix the modified lignin, polyether polyol, amine catalyst, foaming agent and surfactant evenly, place between the outer wood-based board and the inner wood-based board, and then according to the isocyanate index 1.2 Add isocyanate to react, the reaction temperature is 15-30°C, the reaction time is 3 minutes, and the pr...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/64C08G18/32C08J9/10C08J9/00B32B27/40B32B27/06B32B33/00C08L75/08C08L83/10C08L83/04
Inventor 韩雁明储富祥李改云
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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