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Lignin-base auxiliary agent for phenolic resin adhesive and its preparation method and application

A phenolic resin, lignin technology, applied in the direction of polymer adhesive additives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of water resistance decline of adhesives

Inactive Publication Date: 2008-01-16
上海复爱绿色化学技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that the introduction of lignin into phenolic resin adhesives will lead to a decrease in the water resistance of the adhesive, and water resistance is the most significant advantage of phenolic resin adhesives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of highly reactive ultra-high molecular weight lignin

[0017] After the lignosulfonate (ammonium salt) is ultra-filtered, the fraction with a molecular weight greater than 10,000 is extracted. The experimental conditions are: cellulose acetate membrane with a pore size of 0.04 μm and an effective membrane area of ​​10 cm 2 plate and frame ultrafilter. The temperature of ultrafiltration feed liquid is room temperature, and the range of ultrafiltration pressure difference is 0.1-0.25mpa. Before testing the permeation flux, pre-press the membrane with 0.15mpa pressure for 30min to stabilize the permeability of the membrane.

[0018] The lignin obtained after ultrafiltration is the ultra-high molecular weight part. Take 100 grams of lignin, mix it with 100 grams of formaldehyde aqueous solution (37%), and stir and react for 0.5 hours at 95 degrees Celsius and a pH value of 8. The resulting product can be filtered and dried.

Embodiment 2

[0019] Example 2: Preparation of highly reactive ultra-high molecular weight lignin

[0020] After the lignosulfonate (sodium salt) is ultra-filtered, the fraction with a molecular weight greater than 10,000 is extracted. The experimental conditions are: cellulose acetate membrane with a pore size of 0.04 μm and an effective membrane area of ​​10 cm 2 plate and frame ultrafilter. The temperature of ultrafiltration feed liquid is room temperature, and the range of ultrafiltration pressure difference is 0.1-0.25mpa. Before testing the permeation flux, pre-press the membrane with 0.15mpa pressure for 30min to stabilize the permeability of the membrane.

[0021] The lignin obtained after ultrafiltration is the ultra-high molecular weight part. Take 100 grams of lignin, mix it with 500 grams of formaldehyde aqueous solution (37%), and stir and react for 1 hour at 70 degrees Celsius and a pH value of 10. The resulting product can be filtered and dried.

Embodiment 3

[0022] Example 3: Preparation of highly reactive ultra-high molecular weight lignin

[0023] After lignosulfonate (magnesium salt) is ultra-filtered, the fraction with a molecular weight greater than 10,000 is extracted. The experimental conditions are: cellulose acetate membrane with a pore size of 0.04 μm and an effective membrane area of ​​10 cm 2 plate and frame ultrafilter. The temperature of ultrafiltration feed liquid is room temperature, and the range of ultrafiltration pressure difference is 0.1-0.25mpa. Before testing the permeation flux, pre-press the membrane with 0.15mpa pressure for 30min to stabilize the permeability of the membrane.

[0024] The lignin obtained after ultrafiltration is the ultra-high molecular weight part. Take 100 grams of lignin, mix it with 1000 grams of formaldehyde aqueous solution (37%), and stir and react for 2 hours at 45 degrees Celsius and a pH value of 12. The resulting product can be filtered and dried.

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Abstract

Belonging to the technical field of macromolecule binder, the invention relates to the preparation and application of a lignin additive for phenolic resin adhesive. The lignin additive is composed of hydroxylmethylated lignin with a molecular weight over 10000 and auxiliary components, wherein the raw material lignin is sulfonate lignin and the auxiliary components are Na3PO4, Na2HPO4, urea and NaOH. The preparation steps comprise the ultrafiltration treatment and hydroxylmethylation of lignin and the mixing of lignin with the auxiliary components. By adding the additive into the phenolic resin adhesive, the environmental protection performance of the resin adhesive is largely improved and the product cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer adhesives, and in particular relates to an auxiliary agent for phenolic resin adhesives and a preparation method and application thereof. Background technique [0002] Phenolic resin should have a history of nearly a hundred years as an adhesive. Among them, water-soluble phenolic resin has become one of the most widely used adhesives in wood-based panels due to its simple preparation, excellent strength and water resistance after thermosetting. However, as one of the three aldehyde adhesives, phenolic resin adhesives contain relatively high free aldehydes or free phenols, which will slowly release substances harmful to the human body during use. Therefore, it performs poorly in environmental protection performance. How to improve the environmental protection index of phenolic formaldehyde is a problem at present. [0003] In addition, due to the rising price of crude oil, the cost of phenol re...

Claims

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Application Information

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IPC IPC(8): C09J11/08C09J161/06C07G1/00C08H7/00
Inventor 张雷方红霞钟澄
Owner 上海复爱绿色化学技术有限公司
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