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Reinforced lignin-base polyurethane hard foam and preparation method thereof

A polyurethane rigid foam and lignin-based technology, which is applied in the field of polymer chemistry, can solve the problems of polyurethane foam becoming brittle, affecting the uniformity of foaming, and being unsuitable for rigid foam materials, achieving excellent compressive strength, avoiding adverse effects, The effect of improving solubility

Active Publication Date: 2014-09-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing polyurethane rigid foam, the use of the above-mentioned solvents will produce the following consequences: (1) a large amount of heat will be released during the polymerization and foaming process, and the boiling point of non-alcoholic polar solvents such as dioxane does not exceed 120 ° C. It is easy to be volatilized by heat and cause the cells to become larger. At the same time, the degree of heat dissipation in different parts of the foam body is different in the process, which will also affect the uniformity of foaming; (2) The above-mentioned small molecule polyols have a high boiling point (higher than 200°C ), but because of its relatively small molecular weight (both lower than 150), the chain segment is too short, which will make the polyurethane foam made brittle; (3) Although polyethylene glycol is compatible with certain lignin Better, the relative molecular weight and boiling point are also moderate, but because of its low reaction functionality, it is not suitable for the preparation of hard foam materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of lignin polyol: First, stir and mix 20g lignin acetate and 200g polyether polyol 4110 to obtain lignin polyol with a viscosity of 3010mPa.s;

[0034] (2) Preparation of rigid polyurethane foam: Take 20g of the lignin polyol prepared in (1), add 0.3g of triethylenediamine, 0.2g of stannous octoate, 0.4g of polydimethylsiloxane and 4g of HCFC-141b, after stirring and mixing, add 25g of toluene diisocyanate, stir with an electric stirrer (3000r / min) and foam to obtain lignin-based polyurethane rigid foam.

[0035] The compressive strength of the hard foam is 0.503MPa; the tensile strength is 0.471MPa; the impact strength is 1.218kJ / m 2 ; The bending strength is 1.528MPa.

Embodiment 2

[0037] (1) Preparation of lignin polyol: first mix 20g of lignin acetate and 30g of dioxane, then add 200g of polyether polyol 4110 and continue stirring to obtain lignin polyol with a viscosity of 2670mPa.s;

[0038] (2) Preparation of rigid polyurethane foam: Take 20g of the lignin polyol prepared in (1), add 0.3g of triethylenediamine, 0.2g of stannous octoate, 0.4g of polydimethylsiloxane and 4g of HCFC-141b, after stirring and mixing, add 25g of toluene diisocyanate, stir with an electric stirrer (3000r / min) and foam to obtain lignin-based polyurethane rigid foam.

[0039] The compressive strength of the hard foam is 0.462MPa; the tensile strength is 0.429MPa; the impact strength is 1.136kJ / m 2 ; The bending strength is 1.37MPa.

Embodiment 3

[0041] (1) Preparation of lignin polyol: first mix 20g lignin acetate and 30g dioxane, then add 200g polyether polyol 4110 and continue stirring; while maintaining stirring, heat the system to 140°C , and then control the temperature fluctuation within 20 minutes while stirring to not exceed ±5°C, and evaporate the solvent to obtain lignin polyol with a viscosity of 2860mPa.s;

[0042] (2) Preparation of rigid polyurethane foam: Take 20g of the lignin polyol prepared in (1), add 0.3g of triethylenediamine, 0.2g of stannous octoate, 0.4g of polydimethylsiloxane and 4g of HCFC-141b, after stirring and mixing, add 25g of toluene diisocyanate, stir with an electric stirrer (3000r / min) and foam to obtain lignin-based polyurethane rigid foam.

[0043] The compressive strength of the hard foam is 0.689MPa; the tensile strength is 0.612MPa; the impact strength is 1.479kJ / m 2 ; The bending strength is 1.757MPa.

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Abstract

The invention discloses a reinforced lignin-base polyurethane hard foam and a preparation method thereof. The preparation method comprises the following steps: (1) preparation of lignin polybasic alcohol: stirring lignin and organic non-alcohol polar solvent in a mass ratio of 1:2-1:20, adding polyether glycol, continuing stirring, and evaporating to remove solvent, thereby obtaining the lignin polybasic alcohol; and (2) preparation of polyurethane hard foam: stirring 100 parts by mass of lignin polybasic alcohol, 1-3 parts by mass of amine catalyst, 0.5-2 parts by mass of organic tin catalyst, 0.5-3 parts by mass of polydimethylsiloxane and 10-30 parts by mass of foaming agent, adding 60-150 parts by mass of isocyanate, and foaming to obtain the lignin-base polyurethane hard foam. Compared with the foam material prepared by the traditional method, the lignin-base polyurethane hard foam disclosed by the invention has higher compression strength, tensile strength, bending strength and impact strength.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, in particular to a preparation method of lignin-based polyurethane rigid foam. More specifically, it relates to a reinforced polyurethane rigid foam prepared from lignin and a preparation method thereof. Background technique [0002] Due to the increasingly tense situation of energy and environmental crisis faced by human beings, natural polymers have been paid more and more attention. Lignin is a natural high polymer widely present in plants, and it is a very abundant renewable resource. There are active groups such as aromatic groups, phenolic hydroxyl groups, alcoholic hydroxyl groups, and carbon-based conjugated double bonds in the molecular structure of lignin, so many chemical reactions can be carried out, so that they can be used in subsequent chemical products. [0003] Polyurethane foam is made of isocyanate and polyol through polymerization and foaming, and is divided into soft and ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/64C08G18/48C08J3/05C08G101/00
Inventor 敖日格勒马琳谌凡更孙宇翔
Owner SOUTH CHINA UNIV OF TECH