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Lignin-modified phenolic foam and preparation method thereof

A technology of phenolic foam and lignin, which is applied in the field of lignin-modified phenolic foamed plastics, can solve the problems of slag removal and poor phenolic foam toughness, and achieves the effects of cost reduction, foam toughness improvement and dependency reduction.

Active Publication Date: 2012-06-20
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of poor toughness and serious slag drop of phenolic foam existing in the prior art, and make full use of renewable biomass resources at the same time

Method used

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  • Lignin-modified phenolic foam and preparation method thereof
  • Lignin-modified phenolic foam and preparation method thereof
  • Lignin-modified phenolic foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 25g of acid-hydrolyzed lignin (20% substitute for phenol) in 30g of water, add aqueous sodium hydroxide solution to adjust the pH to 8, connect the ozone generator, and react at 50°C for a period of time. Adjust the temperature to 80-85°C, add 60% phenol and 50% formaldehyde (phenol-formaldehyde molar ratio 1:1.7), pH to 8.5, after a certain period of reaction, add the remaining phenol and formaldehyde, pH to 8.5, and then react for a certain period of time and heat up to 90°C, continue to react until the viscosity is suitable, cool down to 80°C, neutralize with acetic acid to pH 6-7, dehydrate under reduced pressure to a solid content of 80%, and obtain lignin-modified resole phenolic resin. The resin is blended with n-pentane, hydrochloric acid and Tween-80 to foam and solidify to obtain lignin modified phenolic foamed plastics.

[0037] Lignin modified phenolic foam properties: density 80-30kg / cm 3 ; Closed cell rate ≥ 80%; its compressive strength (compre...

Embodiment 2

[0042] 42.9g of corn cob alkali lignin (30%wt instead of phenol) was dissolved in 40g of water, and the pH was adjusted to 8 by adding sodium hydroxide aqueous solution, connected to the ozone generator, and reacted at 50°C for a period of time. Adjust the temperature to 80-85°C, add 60% phenol and 50% formaldehyde (phenol-formaldehyde molar ratio 1:1.7), pH to 8.5, after a certain period of reaction, add the remaining phenol and formaldehyde, pH to 8.5, and then react for a certain period of time and heat up to 90°C, continue to react until the viscosity is suitable, cool down to 80°C, neutralize with hydrochloric acid to pH 6-7, and dehydrate under reduced pressure to a solid content of 80%, to obtain a lignin-modified resole phenolic resin. The resin is blended with n-pentane, hydrochloric acid and Tween-80 to foam and solidify to obtain lignin modified phenolic foamed plastics.

[0043]

Embodiment 3

[0045] Dissolve 42.9g of kraft lignin (30% substitute for phenol) in 40g of water, add potassium hydroxide aqueous solution to adjust the pH to 8, connect the ozone generator, and react at 50°C for a period of time. Adjust the temperature to 80-85°C, add 60% phenol and 50% formaldehyde (phenol-formaldehyde molar ratio 1:1.5), pH to 8.5, react for a certain period of time, add the remaining phenol and formaldehyde, pH to 8.5, then react for a certain period of time and heat up to 90°C, continue to react until the viscosity is suitable, cool down to 80°C, neutralize with acetic acid to pH 6-7, dehydrate under reduced pressure to a solid content of 80%, and obtain lignin-modified resole phenolic resin. The resin is blended with n-pentane, hydrochloric acid and Tween-80 to foam and solidify to obtain lignin modified phenolic foamed plastics.

[0046]

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Abstract

The invention relates to a preparation method of lignin modified phenolic foam, comprising the following steps: modifying high molecular weight lignin in order to degrade into low molecular weight lignin, wherein the activity is improved, replacing the phenol by the degraded lignin, preparing lignin modified resol, mixing with curing agent, foaming agent and surfactant, foaming at room temperature (25-30 DEG C) or in an oven of temperature 40-80 DEG C, finally the modified phenolic foam plastic is obtained after the curing process. The preparation method of the invention has the following advantages: the cost of the phenolic foam is greatly reduced, the toughness of the foam is increased and the brittles is decreased, thus the foam of the lignin modified phenolic foam has good market prospect; the preparation method of the invention provides a high-addition way to the abundant pulp paper-making waste liquid and forestry and agricultural residues, and reduces the dependency of phenolic foam industry on petrochemical raw material phenol.

Description

technical field [0001] The invention relates to a preparation method of lignin-modified phenolic foamed plastics. The prepared foam has improved toughness and reduced cost, and is a product with good market prospect. [0002] Background technique [0003] Phenolic foam is a new type of foam developed in recent years. It is famous for its good flame resistance, low smoke generation, good high temperature resistance, stable performance, heat insulation, sound insulation, easy molding and good durability. It ranks at the forefront of all foam plastics and is called "the third generation of emerging thermal insulation materials" or "the king of thermal insulation". After 1960, many serious fires occurred in public buildings at home and abroad, and most of the accident deaths were caused by asphyxiation of toxic gases, which caused the public and officials to pay more attention to the fire prevention of building materials, especially synthetic materials. The excellent performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/14C08G8/28C08J9/00
Inventor 周永红胡立红刘瑞杰
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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