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A process for preparing polyurethane foam using a new lignin liquefaction method

A technology of polyurethane foam and lignin, which is applied in the field of material chemical industry, can solve the problems of small addition of lignin, increase of production cost, etc., achieve good production industrialization prospects, reduce production cost, and simple process flow

Active Publication Date: 2017-11-14
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification technology in this method greatly increases the production cost, and generally the amount of lignin added is not large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix glycerin and triethanolamine at a mass ratio of 5:1 to prepare a liquefaction reagent, then take 60 parts by mass of the liquefaction reagent and 10 parts by mass of corn cob enzymatic lignin and add them to the reaction bottle, mix well, and then add 0.35 mass parts 95 wt% concentrated sulfuric acid and 1.75 parts Tween-80, heated up to 150° C. with constant stirring, and reacted at constant temperature for 1 hour. After the reaction, lignin liquefied polyol was obtained. The lignin liquefaction polyol was fully washed with anhydrous methanol, and after filtration, the lignin liquefaction rate was 95.72%.

[0026] Mix the lignin liquefied polyol and polyether 4410 at a mass ratio of 1:1, the measured hydroxyl value of the mixed polyol is 580.93mg KOH / g, and the viscosity is 537.31mpa.s; take 10 parts by mass of the mixed polyol, and mix them with Mix 0.6 parts by mass of blowing agent cyclopentane, 0.25 parts by mass of dibutyltin dilaurate, and 0.2 parts by mass o...

Embodiment 2

[0028] Mix glycerin and triethanolamine at a mass ratio of 4:1 to prepare a liquefaction reagent, then take 60 parts by mass of the liquefaction reagent and 10 parts by mass of corn cob enzymatic lignin and add them to the reaction bottle, mix well, and then add 0.35 mass parts 95 wt% concentrated sulfuric acid and 1.75 mass parts Tween-80, stirred continuously to raise the temperature to 150° C., and reacted at constant temperature for 1 hour. After the reaction, lignin liquefied polyol was obtained. The lignin liquefaction polyol was fully washed with anhydrous methanol, and after filtration, the lignin liquefaction rate was 96.80%.

[0029] Mix lignin liquefied polyol and polyether 4410 at a mass ratio of 1:1, the measured hydroxyl value of the mixed polyol is 491.38mg KOH / g, and the viscosity is 420.8mpa.s. Take 10 parts by mass of the mixed polyol, and mix them with Mix 0.6 parts by mass of blowing agent cyclopentane, 0.25 parts by mass of dibutyltin dilaurate, and 0.2 pa...

Embodiment 3

[0031] Mix glycerin and triethanolamine at a ratio of 3:1 to prepare a liquefaction reagent, then take 60 parts by mass of the liquefaction reagent and 10 parts by mass of corn cob enzymatic lignin and add them to the reaction bottle, mix well, and then add 0.35 parts by mass 95wt% concentrated sulfuric acid and 1.75 parts by mass Tween-80 were stirred continuously and the temperature was raised to 150° C., and reacted at a constant temperature for 1 hour. After the reaction was completed, lignin liquefied polyol was obtained. The lignin liquefaction polyol was fully washed with anhydrous methanol, and after filtration, the lignin liquefaction rate was 99.03%.

[0032]Mix the lignin liquefied polyol and polyether 4410 at a mass ratio of 1:1. The measured hydroxyl value of the mixed polyol is 425.19 mg KOH / g, and the viscosity is 387.1 mpa.s. Take 10 parts by mass of the mixed polyol and mix them with Mix 0.6 parts by mass of blowing agent cyclopentane, 0.25 parts by mass of di...

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Abstract

The invention discloses a technology for preparing polyurethane foam through a novel lignin liquefaction method. The technology comprises the following steps that 1, lignin, a liquefaction reagent, a catalyst and a surfactant are mixed evenly and react at the temperature of 130 DEG C-180 DEG C under stirring for 30-120 min, and the mixture is naturally cooled after reacting is completed to obtain liquefied lignin polyalcohol; the liquefied lignin polyhydric alcohol prepared in the step 1 is taken and mixed with polyether polyalcohol, and the lignin polyurethane foam is prepared according to a foaming technology of polyurethane foam. According to the technology, the method is high in efficiency, the liquefied degraded lignin-based polyalcohol is high in hydroxyl content and higher in reaction activity, the compatibility of the lignin and organic solvent polyalcohol is greatly improved, the good dispersity is achieved, and the polyurethane foam material which is safe, free of poison, green, environmentally friendly and degradable can be prepared.

Description

technical field [0001] The invention belongs to the field of material chemical industry and relates to a process for preparing polyurethane foam from lignin liquefaction products. Background technique [0002] Due to its excellent physical and chemical properties, polyurethane foam has a wide range of applications in the fields of materials, chemicals, and medicine. However, with the aggravation of environmental pollution and resource shortage, the use of renewable resources to replace petroleum-based polyols to prepare green and degradable polyurethane foams has attracted more and more attention from the country and scientific researchers. Lignin is a natural polymer compound that is green, environmentally friendly, renewable, rich in sources, low in price, and second only to cellulose in content. It is a promising renewable resource. However, in the paper industry and hydrolysis industry, most of the industrial lignin produced is directly discharged as waste or burned as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/64C08G18/48C08J9/14
CPCC08G18/4081C08G18/48C08G18/6492C08G18/7671C08J9/141C08J2203/14
Inventor 应汉杰夏治停朱晨杰陈勇吴菁岚庄伟陈晓春
Owner NANJING TECH UNIV