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Method for preparing biomass adhesive from alfalfa meal

A kind of technology of alfalfa grass powder and production method, which is applied in the direction of adhesive, adhesive type, polyurea/polyurethane adhesive, etc., can solve the problems of complex lignin structure, easy retrogradation of gelatinized liquid, and water resistance, etc., to achieve The production process is simple, the extraction efficiency is improved, and the effect of increasing added value

Active Publication Date: 2013-07-17
广东好上好科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: the drying speed of starch adhesive is slow, not water-resistant, the gelatinized liquid is easy to retrograde, and the storage period is short; the lignin adhesive is still in the experimental stage, the lignin structure is complex, the macromolecular structure is uneven, and it is difficult to degrade; Soy protein adhesives have relatively poor bonding strength and water resistance, low resistance to microbial degradation, and consume food, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh 100 g of dry 80-mesh alfalfa stem powder, add 2000 mL of distilled water, soak for 24 hours, add 400 mL of ethanol, stir evenly, and suction filter;

[0020] (2) Use NaOH to adjust the pH of the filtrate to 8, then raise the temperature of the filtrate to 70 ° C, keep it warm for 5 min., cool to room temperature, filter with suction, and dry the filter cake;

[0021] (3) Weigh 50 g of the filter cake, place it in a three-necked bottle equipped with 750 ml of distilled water, add sodium dodecylbenzenesulfonate according to 3% of the mass of the filter cake, and after heating at 30°C for 2 hours, add 20% of it dropwise NaOH, adjust the pH of the solution to 9, add 15% polyphenyl polymethylene polyisocyanate (the mass fraction of isocyanate group-NCO is 28%), and react for 1.5h to prepare a biomass adhesive.

[0022] After testing: the contact angle of the adhesive on the surface of the poplar veneer is 52°, the viscosity measured by a rotational viscometer is 62...

Embodiment 2

[0024] (1) Weigh 100 g of dry 60-mesh alfalfa leaf powder, add 1500 mL of distilled water, soak for 20 hours, add 350 mL of ethanol, stir evenly, and filter with suction;

[0025] (2) Use NaOH to adjust the pH of the filtrate to 7, then raise the temperature of the filtrate to 60 ° C, keep it warm for 5 min., cool to room temperature, filter with suction, and dry the filter cake;

[0026] (3) Weigh 50 g of filter cake, place it in a three-necked bottle equipped with 750 ml of distilled water, add sodium dodecylbenzenesulfonate according to 1% of the filter cake mass, and after heating at 30°C for 1.5h, add 20 % NaOH, adjust the pH of the solution to 9, add 5% polyphenyl polymethylene polyisocyanate (the mass fraction of isocyanate group-NCO is 20%), and react for 1 h to prepare a biomass adhesive.

[0027] After testing: the contact angle of the adhesive on the surface of the poplar veneer is 55°, the viscosity measured by a rotational viscometer is 56mPa·S, and the bonding st...

Embodiment 3

[0029] (1) Weigh 100 g of dry 100-mesh alfalfa stem powder, add 2500 mL of distilled water, soak for 28 hours, add 450 mL of ethanol, stir evenly, and suction filter;

[0030] (2) Use NaOH to adjust the pH of the filtrate to 9, then raise the temperature of the filtrate to 80° C., keep it warm for 5 minutes, cool to room temperature, filter with suction, and dry the filter cake;

[0031] (3) Weigh 50g of filter cake, place it in a three-necked bottle equipped with 750ml of distilled water, add sodium dodecylbenzenesulfonate according to 5% of the filter cake mass, and after heating at 30°C for 2.5h, add 20 % NaOH, adjust the pH of the solution to 9, add 25% polyphenyl polymethylene polyisocyanate (the mass fraction of isocyanate group-NCO is 36%), and react for 2 hours to prepare a biomass adhesive.

[0032] After testing: the contact angle of the adhesive on the surface of the poplar veneer is 60°, the viscosity measured by a rotational viscometer is 75mPa·S, and the bonding ...

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Abstract

The invention relates to a method for preparing a biomass adhesive from alfalfa meal. The method comprises the following steps of: weighing the alfalfa meal, soaking the alfalfa meal into water, adding ethanol, stirring uniformly and filtering; adjusting the pH of the filtrate, then heating the filtrate, preserving the heat, cooling to room temperature, filtering, and drying filter cakes; weighing the filter cakes, putting the filter cakes into a three-necked bottle filled with distilled water, adding sodium dodecyl benzene sulfonate, heating for a period of time, dripping NaOH, adjusting the pH of the solution to 9, adding poly(phenyl methylene isocyanate), and reacting, thus obtaining the biomass adhesive. By adopting the method, the biomass adhesive with good adhesive property is prepared from the meal raw material of alfalfa with wide planting area, high yield and reproducibility, a deep processing product of the alfalfa with industrialized value is obtained, the additional value is improved, meanwhile, the obtained adhesive does not contain the components such as formaldehyde and aromatic hydrocarbon harmful to human bodies, the cost is low, the process is simple, and the adhesive can be applied in the fields of wood veneers, shaving boards, fiber board and the like.

Description

technical field [0001] The invention relates to a method for preparing a biomass adhesive by using alfalfa powder. The biomass adhesive is mainly used in the production of wood plywood and furniture, and belongs to the technical field of wood adhesives. technical background [0002] In recent years, the world's wood industry has developed by leaps and bounds, and adhesives play an important role in its development process. The quality and output of adhesives restrict the development of wood industries in various countries. At present, the wood-based panel industry most commonly uses "trialdehyde" glue that is made of petroleum. However, these adhesives will release formaldehyde, a gas harmful to the human body during use, and due to the global energy crisis, the price of synthetic resins using petroleum as raw material continues to rise. In the context of environmental protection and resource shortages, the preparation of biomass wood adhesives from non-toxic natural polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04
Inventor 雷文陈宁宁景露王明彦孙莉张益彬田媛
Owner 广东好上好科技有限公司
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