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A modified lignin weather-resistant adhesive and preparation method thereof

A lignin and adhesive technology, applied in the direction of adhesives, adhesive additives, adhesive types, etc., can solve the problems of adhesives such as poor high temperature resistance, complicated preparation process, single component, etc., to achieve improved performance, The effect of reducing cost and reducing content

Active Publication Date: 2021-10-22
宁波赫革丽高分子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nowadays, there are many kinds of adhesives, including thermosetting type, hot melt type, room temperature curing type, pressure sensitive type, etc.; according to the application object, it can also be divided into structural type, non-configuration or special adhesive; the bonding form can be divided into water-soluble Type, water emulsion type, solvent type and various solid types, etc. There are many types of adhesives sold on the market, but most of them have single components, complicated preparation process, and poor high temperature resistance of adhesives. It is flammable when in use and causes us inconvenience

Method used

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  • A modified lignin weather-resistant adhesive and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of a modified lignin weather-resistant adhesive, comprising the following steps:

[0037] (1) Take acidic lignin, dry at 60°C for 18 hours, ball mill for 5 minutes, add resorcinol and acetone, mix and stir for 20 minutes, remove acetone by rotary evaporation, add concentrated sulfuric acid, stir for 1 hour, filter, deionized water Wash until neutral, dry to obtain phenolized lignin;

[0038] (2) Take defatted soybean protein powder and water, mix and stir at 38°C for 20 minutes, add sodium hydroxide, adjust the pH to 9, continue to stir and react for 1 hour, then add additives, stir and react until the pH is 8, then add phenolized lignin , alkaline lignin, phenol and formaldehyde, heat preservation reaction at 75°C for 50 minutes, add hydrogen peroxide, continue to stir and react for 20 minutes, and obtain material A;

[0039] (3) Take material A, slowly cool down to 68°C, continue to add formaldehyde and sodium hydroxide, continue to react for 20 ...

Embodiment 2

[0045] A preparation method of a modified lignin weather-resistant adhesive, comprising the following steps:

[0046] (1) Take acidic lignin, dry at 65°C for 19 hours, ball mill for 8 minutes, add resorcinol and acetone, mix and stir for 25 minutes, remove acetone by rotary evaporation, add concentrated sulfuric acid, stir for 1.2 hours, filter and deionize Washing with water until neutral, drying to obtain phenolated lignin;

[0047] (2) Take defatted soybean protein powder and water, mix and stir at 39°C for 25 minutes, add sodium hydroxide, adjust the pH to 9.5, continue to stir and react for 1.1 hours, then add additives, stir and react until the pH is 8.5, and then add phenolized lignin lignin, alkaline lignin, phenol and formaldehyde, heat preservation reaction at 78°C for 55 minutes, add hydrogen peroxide, continue to stir and react for 25 minutes, and obtain material A;

[0048] (3) Take material A, slowly cool down to 70°C, continue to add formaldehyde and sodium hyd...

Embodiment 3

[0054] A preparation method of a modified lignin weather-resistant adhesive, comprising the following steps:

[0055] (1) Take acidic lignin, dry at 70°C for 20 hours, ball mill for 10 minutes, add resorcinol and acetone, mix and stir for 30 minutes, remove acetone by rotary evaporation, add concentrated sulfuric acid, stir for 1.5 hours, filter and deionize Washing with water until neutral, drying to obtain phenolated lignin;

[0056] (2) Take defatted soy protein powder and water, mix and stir for 30 minutes at 38-40°C, add sodium hydroxide, adjust the pH to 10, continue to stir and react for 1.2 hours, then add additives, stir and react until the pH is 8.5, and then add phenol Chemical lignin, alkaline lignin, phenol and formaldehyde, heat preservation reaction at 80°C for 60 minutes, add hydrogen peroxide, continue stirring and reaction for 30 minutes, and obtain material A;

[0057] (3) Take material A, slowly lower the temperature to 72°C, continue to add formaldehyde a...

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Abstract

The invention discloses a modified lignin weather-resistant adhesive and a preparation method thereof, which comprises a polyurethane, a modified phenolic resin and a catalyst; in the present invention, the conventional phenolic resin is modified by Acidic lignin, resorcinol, acetone, concentrated sulfuric acid and other components are phenolic to acid lignin to obtain phenolic lignin. Phenolic lignin contains more phenolic hydroxyl groups and free reaction sites, which can replace Part of the phenol is reacted with formaldehyde to obtain a phenolic resin. This step can not only effectively reduce the cost, but also reduce the content of free phenol and free formaldehyde, and improve the performance of the adhesive. The adhesive prepared by the present application not only has excellent heat resistance and flame retardant properties, but also can be cured at room temperature, and has good adhesion and is not easy to fall off. low, more practical.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a modified lignin weather-resistant adhesive and a preparation method thereof. Background technique [0002] Adhesive bonding refers to the technology of connecting the surfaces of homogeneous or heterogeneous objects with adhesives. It has the characteristics of continuous stress distribution, light weight, or sealing, and most processes have low temperature. Gluing is especially suitable for the connection of different materials, different thicknesses, ultra-thin specifications and complex components. [0003] Nowadays, there are many kinds of adhesives, including thermosetting type, hot melt type, room temperature curing type, pressure sensitive type, etc.; according to the application object, it can also be divided into structural type, non-configuration or special adhesive; the bonding form can be divided into water-soluble Type, water emulsion type, solvent type and various solid ...

Claims

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Application Information

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IPC IPC(8): C09J161/14C09J175/04C09J11/04C08G8/28C08H7/00
CPCC09J161/14C09J11/04C08G8/28C08H6/00C08K2003/3063C08L2201/02C08L2201/08C08L75/04C08K3/30C08K3/16
Inventor 不公告发明人
Owner 宁波赫革丽高分子科技有限公司
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