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Lignose and process for modifying phenolic resin with derivates thereof

A technology of phenolic resin and lignin, which is applied in the field of materials, can solve the problems of poor mechanical properties, environmental pollution, and high production costs, and achieve the effects of performance improvement, effective waste of resources, and cost increase

Inactive Publication Date: 2008-10-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high production cost, serious environmental pollution and weak mechanical properties of existing phenolic resins, we introduce cheap and easy-to-obtain natural high-molecular polymer lignin and its derivatives into phenolic resins through multiple polymerizations and gradually deepening the degree of polymerization. in the structure of the resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of phenolic resin from rice husk-extracted lignin.

[0024] (1) Ethanol extraction of lignin in rice husk

[0025] Put rice husk and 80% ethanol aqueous solution into a stirred autoclave according to the mass ratio of 1:6, use 2% acetic acid of rice husk as a catalyst, stir, and heat up to 180° C. for 4 hours. After the reaction, the reactant was cooled to room temperature, filtered with suction, and the rice husk residue was filtered off, and water 3 times that of the reaction solution was added to the remaining solution, and the precipitated brown precipitate was lignin.

[0026] (2) Preparation of phenolic resin

[0027] Put phenol and 36% formaldehyde solution into a three-necked flask with a stirring and reflux device according to the molar ratio of 1:0.65. The mass of phenol is 28.2 g, adjust the pH to 2.7 with hydrochloric acid, stir, heat up to 70°C, and react for 15 minutes. A phenolic resin oligomer is obtained. Put 14.1g of lignin into the olig...

Embodiment 2

[0029] Preparation of Phenolic Resin from Rice Straw Extracted Lignin.

[0030] Rice straw and 80% ethylene glycol aqueous solution were put into a stirred autoclave according to the mass ratio of 1:6, 2% acetic acid by weight of the rice straw was used as a catalyst, stirred, and the temperature was raised to 180° C. for 4 hours. Other operating steps are as in Example 1, using p-toluenesulfonic acid as an acidic catalyst to prepare phenolic resin.

Embodiment 3

[0032] Preparation of straw-extracted lignin-based phenolic resins.

[0033] Straw and 90% ethylene glycol aqueous solution were put into a stirred autoclave at a mass ratio of 1:10, 2% acetic acid by weight of the straw was used as a catalyst, stirred, and the temperature was raised to 180° C. for 4 hours. Other operating steps are as in Example 1, using oxalic acid as an acidic catalyst to prepare phenolic resin.

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PUM

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Abstract

The invention discloses a lignin and a method for modifying a phenolic resin which is a ramification thereof. The method that the polymerization is performed for a plurality of times and the extent of polymerization is deepened gradually is adopted to improve the uniform stability, the inoxidability, the toughness and the intensity of the product, effectively recycle the wasted resources, lower the cost and make the industrialization easier. The invention is realized by the technical proposal which is as follows: the phenolic resin low polymer is prepared firstly; the lignin or a ramification thereof is added to polymerize in order to obtain a preformed polymer secondly; finally, phenol and formaldehyde are added to polymerize in order to obtain the high polymer. A molding material prepared by the phenolic resin can be widely applied to the manufacture of a low-voltage apparatus, an insulating structure and a product for daily life.

Description

technical field [0001] The invention belongs to material technology and relates to a method for modifying phenolic resin with lignin and its derivatives. Background technique [0002] Phenolic resin has been widely used in the fields of electrical engineering, aviation, construction and aerospace for its advantages of good heat resistance, high mechanical strength, electrical insulation and high temperature creep resistance since it was mass-produced and made into products. . Its raw materials are easy to obtain, and its synthesis method is simple. It ranks first among the three major plastics in the world. In recent years, phenolic resin has developed towards high mechanization and greening. Chinese patent CN1884416, Beijing Forestry University Zhang Qiuhui etc. disclose a kind of phenolic resin adhesive that is synthesized by wood liquefaction, wood is pulverized into wood powder, adopts phosphoric acid catalyst to carry out phenol liquefaction treatment, obtains wood li...

Claims

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Application Information

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IPC IPC(8): C08G8/08
Inventor 周兵陈雪丁雪峰赵旭刘艳华郭玉鹏王子忱
Owner JILIN UNIV
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