Method of fluidifying peanut shell and producing adhesion agent modifier

A technology of peanut shells and modifiers, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of solvent recovery pollution, complicated process, and low utilization value, and achieve pre-compression The effect of effect improvement

Inactive Publication Date: 2008-02-27
北京光纪国际生物科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using peanut shells to produce wood adhesives is an important way to efficiently utilize peanut shells. There are two main technical routes currently being studied: one is to use peanut shells as fillers for adhesives to partially improve some defects of adhesives, and the use value is not high. The second is to extract the adhesive through solvent extraction, and then react the peanut shell extract with other chemical reagents to prepare the adhesive. The process is complicated, the solvent needs to be recovered, and the extraction residue causes pollution, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 300g of industrial ethanol to the reaction kettle, add 300g of peanut shell powder, stir evenly, soak for 30min, add 115g of concentrated hydrochloric acid, heat up to 140°C, react for 2h, cool down to 50°C, add 115g of caustic soda solution (concentration: 40%), and stir After 20 minutes, cool down to below 40°C and discharge. The ethanol liquefaction product of peanut shell powder is obtained, which is a new type of wood adhesive modifier for indoor plywood.

[0015] The liquid prepared under the above conditions is a brown-black opaque uniform thick liquid with a pH value of 7.8 and a storage period of not less than 20 days.

[0016] The modified agent for wood adhesives for indoor plywood prepared by the above method is used as a strengthening agent and a formaldehyde binder for urea-formaldehyde glue or modified urea-formaldehyde glue, so as to improve the water resistance of glued products and reduce the amount of formaldehyde released.

Embodiment 2

[0018] Inject 1760kg of formaldehyde (concentration 36.8%) into the reactor, adjust the pH value to 8.3-8.5 with 30% caustic soda solution, add the first batch of urea 550kg, heat up to 90±2°C within 30-40min, react for 60min, the pH value at this stage It should be maintained above 7.0; use formic acid to adjust the pH value to 4.9-5.2, and keep it warm at 90±2°C for 120-140min; adjust the pH value to 6.5-6.8, add the second batch of urea 220kg, react at about 90°C for 60min, and measure the viscosity; When the viscosity reaches 12-14s, adjust the pH value to 7.5-7.6, add the third batch of urea 180kg, and react for 30-60min; adjust the pH value to 7.8-8.0, cool down to 60°C, and add the peanuts prepared in Example 5 245kg of ethanol liquefaction product of shell powder, react at 80-85°C for 30-50min, cool to 35°C, and discharge.

[0019] The solid content of the adhesive prepared by this method is 45.2%, the free formaldehyde is less than 0.1%, and the storage period is ≥20 ...

Embodiment 3

[0021] Inject 2200kg of formaldehyde (concentration 36.8%) into the reactor, adjust the pH value to 7.8-8.0 with 30% caustic soda solution, heat the temperature of the water bath to 40°C, add the first batch of urea 750kg, and raise the temperature to 90±2°C within 30-40min , after 40min of reaction, use 15% NH 4 Adjust the pH value of the Cl solution to 4.9-5.2, and keep it warm at 90±2°C for 30 minutes; add the second batch of urea 250kg, and measure the viscosity every 2 minutes after 30 minutes; End point: use 30% caustic soda solution to adjust the pH value to 6.5-7.0, cool down to 35°C, and discharge. Made of urea-formaldehyde resin adhesive for E2 grade plywood. The solid content of the adhesive is 48.2%, the free formaldehyde is less than 0.5%, and the storage period is ≥20 days; the bonding strength of the plywood made with it is 0.78MPa, and the formaldehyde emission is 8.3mg / L.

[0022] The urea-formaldehyde glue prepared by the above method is added with 20% of t...

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PUM

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Abstract

The invention discloses a preparing method of earthnut shell liquidation and adhesive modifier, which comprises the following steps: removing soil and foreign matter on the surface of earthnut; drying; disintegrating; mixing the earthnut shell powder and alcohol evenly; adding into inorganic middle strong acid or organic strong acid; reacting for 1. 0-4. 0 h with temperature at 120-160 deg. c; adding into caustic soda solution; adjusting pH value to neutral; decreasing the temperature below 40 deg. c; putting into material; getting the alcohol of earthnut shell powder or carbinol liquefied product; getting lumber adhesive agent modifier for glued board in room; increasing water resistance of gummed product; decreasing methyl aldehyde delivery quantity; producing glued board with urea-formaldehyde glue. This adhesive possesses distinctive prepressing effect, which bonding strength at 1. 3MPa and formaldehyde delivery quantity at 4. 5mg/L.

Description

technical field [0001] The invention relates to the preparation method of peanut shell liquefaction and adhesive modifier. The invention belongs to the technical fields of deep processing of agricultural by-products and wood adhesives. Background technique [0002] Urea-formaldehyde resin adhesive is the most widely used adhesive in the wood industry. Its price is low, but it contains free formaldehyde. The glued products will slowly release formaldehyde gas during use and cause environmental pollution. Secondly, its glued water resistance is not ideal. At present, the main methods to solve the above problems include: in the preparation process of urea-formaldehyde glue, reduce the molar ratio of formaldehyde to urea, adopt the process of adding urea multiple times, modify with melamine, thiourea, polyvinyl alcohol, etc., or use it in urea-formaldehyde glue When adding formaldehyde scavenger (mainly chemical substances containing groups that react with formaldehyde). [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/00C09J161/24C09J161/30
Inventor 孙丰文张茜
Owner 北京光纪国际生物科技服务有限公司
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