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Method for preparing grape skin tannin modified phenolic resin adhesive

A technology of phenolic resin and grape skin, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of low bonding strength, low added value, high viscosity, etc., achieve good performance, easy The effect of simple operation and preparation process

Active Publication Date: 2018-03-27
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a small amount of pomace residue has been recycled so far, and most of it is still used as fertilizer, feed or direct waste disposal with little added value
[0005] Due to the structural characteristics of tannin itself, the reaction speed of tannin and formaldehyde is too fast. In addition, the shortcomings of tannin, such as high molecular weight, large steric hindrance effect, and high viscosity, make tannin a substitute for phenol in the synthesis process of phenolic resin. If the amount is low, the performance of the modified phenolic adhesive will decrease, and the product will have disadvantages such as low bonding strength and poor moisture resistance.

Method used

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preparation example Construction

[0016] A preparation method of grape skin tannin modified phenolic resin adhesive, comprising the following process steps:

[0017] (1) Preparation of grape skin extract;

[0018] (2) Grape skin extract biodegradation;

[0019] (3) Preparation of tannin modified phenolic resin;

[0020] (4) Preparation of plywood.

[0021] The step (1) preparation of grape skin extract: Weigh the grape skin powder, use the mixed lye of sodium hydroxide and sodium sulfite as the extractant, control the liquid-solid ratio of lye to grape skin pomace to be 8:1, and the extraction temperature The temperature is 100-120 ℃, and the extraction time is 60-180 min; the reacted material is cooled, washed and filtered, and the filtrate is concentrated to 60-70% mass concentration, and then freeze-dried to obtain grape skin extract powder.

[0022] The step (2) biodegradation of grape skin extract: in the Chase culture medium, add the grape skin extract as an inducer, take the suspension of Aspergillus...

Embodiment 1

[0028] Weigh 200 g of dried grape pomace and place it in a round bottom flask, add 2.5% (based on the absolute dry weight of grape skin) sodium sulfite and 2.5% (based on the absolute dry weight of grape skin) sodium hydroxide, add distilled water, Control the liquid-solid ratio of lye and grape pomace to 8:1, and connect the condenser. Heat to 100°C, cook and reflux for 180 min, then cool to room temperature. Pour out the cooking liquid, add 3 times the amount of cooking liquid in cold water to dilute and wash, filter and separate. The separated cooking liquid was distilled under reduced pressure with a rotary evaporator, the distillation temperature was controlled at 50°C, and the concentrated cooking liquid was freeze-dried to obtain grape skin extract.

[0029] Weigh 20g of grape skin extract into 2L of Aspergillus niger induction culture medium, adjust the pH to 5.5, and the temperature to 20°C, 120r min -1 After 36 hours of culture on a shaker, the culture solution wa...

Embodiment 2

[0033] Weigh 200 g of dried grape pomace and place it in a round bottom flask, add 5% (based on the absolute dry weight of the grape skin) sodium sulfite and 5% (based on the absolute dry weight of the grape skin) sodium hydroxide, add distilled water, Control the liquid-solid ratio of lye and grape pomace to 8:1, and connect the condenser. Heat to 120°C, cook and reflux for 60 min, then cool to room temperature. Pour out the cooking liquid, add 3 times the amount of cooking liquid in cold water to dilute and wash, filter and separate. The separated cooking liquid was distilled under reduced pressure with a rotary evaporator, the distillation temperature was controlled at 60°C, and the concentrated cooking liquid was freeze-dried to obtain grape skin extract.

[0034] Weigh 20g of grape skin extract into 2L of Aspergillus niger induction culture solution, adjust the pH to 6.5, and the temperature to 35°C, 120r min -1 After cultivating on a shaker for 48 hours, the culture s...

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Abstract

The invention relates to a method for preparing a grape skin tannin modified phenolic resin adhesive. The method comprises the following process steps: (1) preparation of a grape skin tannin extract:(2) biodegradation of the grape skin tannin extract: obtaining the grape skin tannin extract with a low molecular weight and low degree of polymerization by sulfite extraction and biodegradation; (3)preparation of tannin modified phenolic resin: using the grape skin tannin extract, phenol, formaldehyde, an alkali solution and water as raw materials, performing a secondary polycondensation reaction by a secondary charging method of the formaldehyde and the alkali solution to prepare the grape skin tannin modified phenolic resin adhesive; (4) preparation of a plywood. The method has the advantages that: (1) condensed tannins with low molecular weight and low degree of polymerization are prepared by a sulfite extraction and biodegradation combination method, so that the space steric effect in the polycondensation reaction is reduced and the adhesive forming properties of phenolic resin are improved; (2) the preparation process is simple, the operation is easy, and the prepared phenolic resin has good properties.

Description

technical field [0001] The invention relates to a method for a tannin-modified phenolic resin adhesive extracted from grape skins, and belongs to the field of wood adhesives. Background technique [0002] Phenolic resin adhesive has the advantages of excellent bonding strength, water resistance, heat resistance, wear resistance and good chemical stability, and is widely used in the production of outdoor-grade plywood, particle board and other wood-based panels. However, its main raw material, phenol, is derived from non-renewable petrochemical products. With the decrease of petroleum resources and the rising price, phenol itself is toxic. Therefore, it is an inevitable development trend to look for renewable resources from nature to replace phenol to synthesize environmentally friendly wood adhesives. [0003] Tannin is a complex polyphenolic compound with a molecular weight in the range of 500-3000 Da widely present in plants. Tannins can be divided into two categories: h...

Claims

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Application Information

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IPC IPC(8): C09J161/06C08G8/24B27D1/08
CPCB27D1/08C08G8/24C09J161/06
Inventor 兰平崔举庆杨蕊冒海燕
Owner NANJING FORESTRY UNIV
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