Process of making phenolic foam with insulin alkali lingin

A technology of alkali lignin and phenolic foam, which is applied in the field of bio-based polymers, can solve the problems of limited industrial utilization of lignin and low reactivity, and achieve the effect of less aging and decomposition and optimized process conditions

Inactive Publication Date: 2015-08-05
JIANGSU QIANXIANG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reactivity of industrial lignin is still very low even after being cooked in the pulping and papermaking process. Zhao Linwu et al. studied the light methylation reaction of alkali lignin, and the results showed that each mo1 C9 unit can react with 0.33 mo1 formaldehyde, and it is estimated that lignin Each C9 unit of lignin has only 0.3 active sites that can react with formaldehyde, while phenol has 3 active sites that can react with formaldehyde, so the industrial utilization of lignin has been limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, insulin alkali lignin was modified by response surface methodology. Mix insulin alkali lignin and water at a ratio of 1:1, add 3mol / L aluminum hydroxide solution and 0.2 parts of hydrogen peroxide, react at a temperature of 50°C for 3 hours, and finally adjust the pH to 2 with dilute hydrochloric acid , centrifuged, washed with distilled water until neutral, and dried at 50°C to make modified lignin.

[0026] Modified lignin is mixed with other materials to form a raw material, and the raw material formula is as follows:

[0027] Modified lignin: 40 parts

[0028] Formaldehyde: 20 parts

[0029] Phenol: 30 parts

[0030] Urea: 5 parts

[0031] Barium hydroxide: 5 parts;

[0032] Add modified lignin first, then add 20% phenol and 40% formaldehyde aqueous solution, react at 80°C for 4 hours, add the remaining phenol and formaldehyde aqueous solution, continue to react at 80°C for 5 hours, and heat up to 85-95°C After 2 hours of reaction, the pH of the reactio...

Embodiment 2

[0034] First, insulin alkali lignin was modified by response surface methodology. Mix insulin alkali lignin and water at a ratio of 1:1, add 3mol / L aluminum hydroxide solution and 0.2 parts of hydrogen peroxide, react at a temperature of 50°C for 3 hours, and finally adjust the pH to 2 with dilute hydrochloric acid , centrifuged, washed with distilled water until neutral, and dried at 50°C to make modified lignin.

[0035] Modified lignin is mixed with other materials to form a raw material, and the raw material formula is as follows:

[0036] Modified lignin: 60 parts

[0037] Formaldehyde: 10 parts

[0038] Phenol: 20 parts

[0039] Urea: 3 parts

[0040] Barium hydroxide: 2 parts;

[0041] Add modified lignin first, then add 40% phenol and 60% formaldehyde aqueous solution, react at 80°C for 4 hours, add the remaining phenol and formaldehyde aqueous solution, continue to react at 80°C for 5 hours, and heat up to 85-95°C After 2 hours of reaction, the pH of the reactio...

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Abstract

The invention discloses a process of making phenolic foam with insulin alkali lingin, which includes the steps of modifying the insulin alkali lingin through a response surface method to obtain modified lignin, preparing phenolic resin with the modified lignin replacing phenol, and preparing the phenolic foam through a common method. In the invention, lignin in wastes is employed so that process conditions of oxidizing degradation of lignin is optimized and the appropriate modified lignin is selected for replacing phenol. Replacement rate of the modified lignin can reach 40-50%. The phenolic foam can be used for fireproofing, is environment-friendly, green and pollution-free, is less in aging decomposition, can be reused as activated charcoal after carbonization, is difficult to burn and is free of toxic gas after being burned.

Description

technical field [0001] The invention relates to a process for making phenolic foam by using insulin alkali lignin, and belongs to the technical field of bio-based polymers. Background technique [0002] In western developed countries, my country's building energy consumption is relatively high, and the energy consumption per unit building area is more than 2-3 times that of developed countries. The energy consumption of building materials and buildings accounts for 47.3% of the total energy consumption, exceeding the sum of all developed countries. The second largest energy consumer. Therefore, building energy conservation is a direct and cheap systematic project to alleviate the contradiction of energy shortage in our country and promote sustainable economic development, and the heat insulation of houses is an important part of this systematic project. It is one of the most important energy-saving means to take thermal insulation measures for the building envelope to improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08H7/00
Inventor 翟立安翟羽佳
Owner JIANGSU QIANXIANG NEW MATERIAL TECH CO LTD
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