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Preparation method of lignin-phenol-formaldehyde resin and preparation method of lignin-phenol-formaldehyde resin foam

A phenolic resin and lignin technology, which is applied in the preparation of lignin phenolic resin and the preparation of lignin phenolic resin foam, can solve the problems of increasing the viscosity of phenolic resin, reducing the strength of phenolic foam, improving foaming difficulty, etc., and achieving low water absorption efficiency, increasing added value, and improving the level of processing and utilization

Inactive Publication Date: 2013-02-20
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of lignin directly applied to resole phenolic resin without pretreatment is too low, and it will cause a substantial increase in the viscosity of phenolic resin, increase the difficulty of foaming, and reduce the strength of phenolic foam

Method used

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  • Preparation method of lignin-phenol-formaldehyde resin and preparation method of lignin-phenol-formaldehyde resin foam
  • Preparation method of lignin-phenol-formaldehyde resin and preparation method of lignin-phenol-formaldehyde resin foam
  • Preparation method of lignin-phenol-formaldehyde resin and preparation method of lignin-phenol-formaldehyde resin foam

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preparation example Construction

[0022] The invention provides a kind of preparation method of lignin phenolic resin, comprises the following steps:

[0023] A) Mix and react lignin, phenolic compound and nucleophile to obtain lignin phenolate;

[0024] B) adjusting the pH value of the lignin phenolate obtained in step A) to alkaline, and then mixing and reacting with aldehyde to obtain a lignin phenolic resin.

[0025] After the lignin phenolic resin is prepared, it is mixed with a foaming agent, a curing agent and a surfactant, and foamed and cured to obtain a lignin phenolic resin foam.

[0026] Compared with the prior art, the present invention uses phenolic compounds as solvents, and then adds nucleophilic reagents to convert α-aryl ethers, α-alkyl ethers, phenolic β-aryl ethers, α- The non-phenolic β-aryl ether of the alcoholic hydroxyl group and the ether bond in the methyl aryl ether are broken, so that the lignin macromolecule can be degraded better, and the lignin liquefaction product with high rea...

Embodiment 1

[0045] Add the corn stalks to the aqueous sodium hydroxide solution after crushing, and cook to obtain a solution in which lignin and hemicellulose are dissolved, filter the obtained solution to remove cellulose insolubles, and obtain lignin black liquor; to lignin black Add hydrochloric acid to the liquid, adjust the pH value to 4, keep warm at 80°C, the lignin black liquor is flocculated and stratified, filtered through pressure, washed with hot water, and dried at low temperature to obtain lignin. After testing, its solid content is 97.5%.

Embodiment 2

[0047] Mix 1 g of lignin prepared in Example 1 with 5 g of molten phenol, add 0.001 g of nucleophile NaOH under stirring conditions, heat the reaction system to 140 ° C, react at a constant temperature for 6 h, and cool down to obtain lignin phenolate; Raise the temperature to 70°C, adjust the pH value to 7.50 with hydrochloric acid, add 2.2g of formaldehyde to the lignin phenolate in batches within 1 hour, and react for 6 hours to obtain the lignin phenolic resin.

[0048] Performance tests were performed on the obtained lignin phenolic resins, and the results are shown in Table 1. Table 1 shows the performance parameters of the phenolic resins prepared in the examples and comparative examples of the present invention.

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Abstract

The invention provides a preparation method of lignin-phenol-formaldehyde resin and a preparation method of lignin-phenol-formaldehyde resin foam. The preparation method of the lignin-phenol-formaldehyde resin comprises the following steps: mixing and reacting lignin and a phenolic compound with a nucleophilic reagent to obtain a lignin phenol compound; adjusting the pH (Potential of Hydrogen) of the lignin phenol compound to reach alkalinity; then mixing and reacting the lignin phenol compound with formaldehyde, so as to obtain the lignin-phenol-formaldehyde resin. The preparation method of the lignin-phenol-formaldehyde resin foam comprises the following steps: mixing the obtained lignin-phenol-formaldehyde resin with a foaming agent, a curing agent and a surface active agent; and foaming and curing to obtain the lignin-phenol-formaldehyde resin foam. According to the preparation methods, the phenol compound serves as a solvent, and the ether bonds in the Alpha-aryl ether, Alpha-alkyl ether, phenol type Beta-aryl ether, non-phenol type Beta-aryl ether containing Alpha-alcoholic hydroxyl, and methyl aryl ether in the lignin are broken, so that lignin macromolecule can be degraded well, and as a result, the activity of the lignin and the strength of the lignin-phenol-formaldehyde resin foam are improved. By adopting the preparation methods, the existing forestry and agricultural residues which have no economic value and bring pollution to the environment are used as the environment-friendly new bio-based polymer materials, and remarkable economic benefits, social benefits and eco-environment benefits are brought thereby.

Description

technical field [0001] The invention relates to the technical field of bio-based polymers, in particular to a preparation method of lignin phenolic resin and a preparation method of lignin phenolic resin foam. Background technique [0002] Lignin, also known as lignin, is a kind of aromatic polymer ubiquitous in plants. It is bonded with cellulose and hemicellulose to form the main structure of plants. It has the function of strengthening wood fibers, and its quantity is second only to fiber It is the second most abundant organic polymer in the plant kingdom. The content of lignin in wood is generally 20% to 40%, and the content of lignin in gramineous plants is generally lower than that in wood, which is 15% to 25%. Lignin is rich in sources and is a renewable resource. It is estimated that its global annual production is about 6×10 5 It is a non-petroleum resource that can provide renewable aromatic compounds in nature, and its yield is relatively high, so it is regarded...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08L61/14C08J9/04
Inventor 江成真李枝芳韩春国左兴信巩传海
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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