Wood adhesive prepared by degrading soybean protein by utilizing strong basicity and preparation method thereof

The technology of wood adhesive and soybean protein is applied in the field of wood processing adhesive and its preparation, which can solve the problems of high moisture content, low soybean protein content, high viscosity, etc., and achieves increased adsorption and improved bonding strength. Effect

Inactive Publication Date: 2011-07-27
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of low soybean protein content, high moisture content and high viscosity in existing soybean adhesives or soybean protein adhesives, and provides a wood adhesive prepared by degrading soybean protein with strong alkali

Method used

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  • Wood adhesive prepared by degrading soybean protein by utilizing strong basicity and preparation method thereof
  • Wood adhesive prepared by degrading soybean protein by utilizing strong basicity and preparation method thereof
  • Wood adhesive prepared by degrading soybean protein by utilizing strong basicity and preparation method thereof

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specific Embodiment approach 1

[0015] Specific Embodiment 1: The wood adhesive prepared by degrading soybean protein with strong alkali in this embodiment is degraded by 60-80 parts of defatted soybean protein powder, 5-10 parts of strong alkali and 95 parts of water in parts by weight. After the reaction, use concentrated phosphoric acid to adjust the pH value to 6.5-7.5, and then add 0.01-20 parts of binary aldehyde and mix well.

[0016] The wood adhesive of this embodiment has a high solid content (the solid content of the glue measured according to the method described in the national standard GBT 14074-2006 is 40.3% to 50.6%), high soybean protein content (its soybean protein powder or soybean protein isolate The weight fraction of the glue is 32% to 42%), low viscosity (measured at 25°C according to the method described in the national standard GBT 14074-2006, the viscosity of the glue is 33 to 245mPa·s), good bonding effect and extremely low free It is characterized by formaldehyde release and is an...

specific Embodiment approach 2

[0017] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the wood adhesive prepared by degrading soybean protein with strong alkali is composed of 60-80 parts by weight of soybean protein isolate, 5-10 parts of strong Alkali and 95 parts of water undergo a degradation reaction, then use concentrated phosphoric acid to adjust the pH value to 6.5-7.5, and then add 0.01-20 parts of binary aldehyde and mix well.

specific Embodiment approach 3

[0018] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the strong base is sodium hydroxide or potassium hydroxide. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a wood adhesive prepared by degrading soybean protein by utilizing strong basicity and a preparation method thereof, and relates to a soybean protein-based wood adhesive and a preparation method thereof. The invention solves the problems of low content of the soybean protein, high moisture content and large viscosity existing in conventional soybean adhesives or soybean protein adhesives. The product is prepared by performing a degradation reaction of defatted soybean protein powder or soybean protein isolate, strong base and water, then using strong phosphoric acid toadjust the pH value of the obtained solution, and then adding dialdehyde into the obtained solution to mix the solution evenly. The method comprises the steps of: 1, weighing; 2, preparing strong base solution, heating the strong base solution, adding the defatted soybean protein powder or the soybean protein isolate into the strong base solution under stirring, and then cooling the strong base solution to a room temperature after heating reflux; and 3, using the strong phosphoric acid to adjust the pH value, adding the dialdehyde into the solution, and stirring the solution evenly. The adhesive has the advantages of high content of the soybean protein, low moisture content and low viscosity, and can be used for preparing plywood, flakeboards and medium-density fiberboards.

Description

technical field [0001] The invention relates to a wood adhesive and a preparation method thereof, in particular to an adhesive for wood processing prepared by degrading soybean protein with strong alkali and a preparation method thereof. Background technique [0002] Due to the strong dependence of synthetic resin adhesives on petroleum, under the situation of increasing consumption of non-renewable and limited petroleum resources, it is necessary to develop and utilize resource-rich and renewable biomass resources to prepare environmentally friendly The research on biomass-based adhesives has attracted the attention of scholars, industries and governments at home and abroad. Soybeans are rich in resources and renewable. According to the statistics of the Food and Agriculture Organization of the United Nations (FAO), the world soybean (seed) production in 2008 exceeded 240 million tons. Soybean seeds are rich in protein, accounting for about 40% of the weight of beans. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J189/00
Inventor 高振华顾继友邸明伟吕新颖顾皞
Owner NORTHEAST FORESTRY UNIVERSITY
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