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Environmentally friendly dextrin-modified phenolic resin and preparation method thereof

A phenolic resin, an environmentally friendly technology, applied in the field of environmentally friendly dextrin-modified phenolic resin and its preparation, can solve the problems of equipment corrosion, increase in rubber production costs, etc., and achieve the effects of low cost, conducive to recycling, and long storage period

Active Publication Date: 2011-12-14
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the methods of these two patent applications, the liquefaction of wood and bean dregs needs to use concentrated acid as a catalyst, which seriously corrodes the equipment, and the liquefaction in the early stage is catalyzed by acid, and the glue is catalyzed by alkali in the later stage. The neutralization of acid and alkali will also cause Increase in the cost of making glue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The main steps of the preparation method of the environment-friendly dextrin modified phenolic resin of the present invention are:

[0025] 1. Prepare materials according to the following weight percentages: phenol 20-38%; formaldehyde 35-50%; alkaline aqueous solution 7-20%; Or the raw material of concentration is preferably: phenol 90-100%; Formaldehyde 35-40%; Alkaline aqueous solution 10-40%; Dextrin (86-98%).

[0026] 2. Preparation of dextrin solution: Add water and dextrin powder with a weight ratio of 1:0.2-1 into the reaction bottle, stir and heat to 50-90°C. When preparing the acidified dextrin, acid with 0.01-1% of the dextrin content can be added to make the pH of the acidified dextrin = 2-5. When the acidified dextrin turns into a uniform translucent solution, the temperature is lowered, and the material is discharged for later use.

[0027] 3. Preparation of phenolic resin polymer: Melt 38-20% phenol by weight into a liquid state in a reaction kettle, add...

Embodiment 1

[0033] The molar ratio of phenol to formaldehyde is 1:1.2.

[0034] 1. Take 100g of water, stir and add 90g of maltodextrin (98%), heat to 80°C for 1hr, cool down and discharge for later use.

[0035] 2. Melt 350g of phenol (100% content) into a liquid state in a reaction kettle, add 367.5g of formaldehyde aqueous solution (37%), add 30g of NaOH (40%) aqueous solution, and heat up to 60°C. React for 90 minutes, uniformly heat up to 85°C, keep warm for 30 minutes, then add 45g of NaOH (40%) aqueous solution, uniformly heat up to 94°C, the viscosity of the glue is 70mPa.s, add the dissolved dextrin aqueous solution, React for 30 minutes, and when the end point is reached, the temperature is lowered to below 40°C and the material is discharged.

Embodiment 2

[0037] The molar ratio of phenol to formaldehyde is 1:1.2, and the dextrin solution is acidified dextrin

[0038] 1. Take 100g of water, stir and add 80g of maltodextrin (96%), adjust the pH to 3 with 4N HCl, heat to 80°C for 1hr, cool down and discharge for later use.

[0039]2. Melt 310g of phenol (100%) into a liquid state in a reaction kettle, add 325.5g of formaldehyde aqueous solution (37%), add 70g of NaOH (40%) aqueous solution, heat up to 60°C, and react for 90 Minutes, uniformly heat up to 86°C, keep warm for 30 minutes, then add 115g of NaOH (40%) aqueous solution, uniformly heat up to 92°C, the viscosity of the glue is 80mPa.s, add the dissolved dextrin aqueous solution, react for 30 minutes, and reach the end When the temperature is lowered to below 40°C, the material is discharged.

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Abstract

An environment-friendly dextrin-modified phenolic resin, which is composed of the following raw materials in weight percent: phenol 20-38%, formaldehyde 35-50%, alkaline aqueous solution 7-20%, dextrin 5-25%; It is to melt phenol first, then add formaldehyde aqueous solution and alkaline aqueous solution in stages to make phenolic resin polymer, and then add the dissolved dextrin solution to prepare the final product, and add the product pH value test in the transition stage during the preparation process And control and viscosity control of transitional products and final products. The cost is low, thereby reducing the cost of the resin by 5-20%. It is environmentally friendly and solves the shortcoming of high free phenol in the phenolic resin prepared by many existing methods. In addition, the method does not require dehydration during the preparation of the phenolic resin, thereby reducing environmental pollution and achieving the purpose of saving energy and reducing consumption.

Description

technical field [0001] The invention relates to an environment-friendly dextrin modified phenolic resin and a preparation method thereof. Background technique [0002] Phenolic resin has excellent properties such as heat resistance, electrical insulation, high mechanical strength and flame retardancy, so it is widely used in molding compounds, paint raw materials, adhesives and anti-wear materials. Researchers are still exploring the further development of phenolic resin. A new way of modification, in order to improve its bonding strength, resin heat resistance, wear resistance, and at the same time, in order to reduce its manufacturing cost, expand the source of raw materials, use renewable starch, wood flour, etc. as raw materials to modify the patent of phenolic resin Technologies have been made public one after another. Beijing Forestry University has applied for a phenolic resin adhesive synthesized from wood liquefaction (Chinese patent application number: 20061001203...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/10C08L5/00
Inventor 任一萍王正
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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