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Environment-friendly type alkali lignin modified phenolic resin adhesive and preparation method thereof

A technology of alkali lignin and phenolic resin, applied in environment-friendly alkali lignin-modified phenolic resin adhesive and preparation thereof, in the field of phenolic resin adhesive, can solve the problem of increasing the water resistance replacement rate of modified phenolic resin adhesive and reducing the production cost of phenolic adhesive , the problem of high aldehyde content, to achieve high replacement rate, low cost, good water solubility

Inactive Publication Date: 2009-02-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to solve the disadvantages of the alkali lignin modified phenolic adhesive, such as the poor water resistance of the cured adhesive layer relative to the phenolic resin glue, the low substitution rate of alkali lignin for phenol, and the high content of residual phenol and aldehyde. It is an environment-friendly phenolic resin adhesive prepared by the activation modification of phenolic resin. On the premise of ensuring the excellent physical and chemical properties of phenolic resin, the adhesive greatly increases the water resistance of modified phenolic resin adhesive and the substitution rate of phenol, and reduces the phenolic adhesive. Lower production costs while reducing residual phenol and free aldehyde content in gums

Method used

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  • Environment-friendly type alkali lignin modified phenolic resin adhesive and preparation method thereof
  • Environment-friendly type alkali lignin modified phenolic resin adhesive and preparation method thereof

Examples

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Embodiment 1

[0032] Weigh 800g of wheatgrass lignin into a flask, add 4500ml of water, and then add 15g of trifluoroacetic acid, seal it, and acidify it at 110°C for 1 hour. Filter, wash the insoluble matter with water, and then vacuum-dry at 50°C to constant weight to obtain desugared alkali lignin.

[0033] Take 20g of dry desugared alkali lignin powder, add 4g of NaOH, 150g of water, control the temperature at 80°C, and stir at constant temperature for 1 hour; cool the reaction solution to 50°C, add 1g of potassium peroxodisulfate, 2g of 2- Naphthol, react for 0.5 hours; cool the reaction solution to 45°C, add 55g of formaldehyde and 80g of phenol with a mass concentration of 37%, react at a constant temperature of 50°C for 30 minutes, and then heat up to 80°C at a rate of 1°C / min , constant temperature reaction for 1 hour; dropwise add 50g of formaldehyde with a mass concentration of 37%, continue the constant temperature reaction for 2 hours, take out 10ml of the reactant every 10 min...

Embodiment 2

[0035] Weigh 800g of bagasse alkali lignin into a flask, add 7500ml of water, add 60g of sulfuric acid, seal it, and acidify it at 120°C for 3 hours. Filter, wash the insoluble matter with water, and then vacuum-dry at 40°C to constant weight to obtain desugared alkali lignin.

[0036] Take 80g of dried desugared alkali lignin powder, add 15g of NaOH, 150g of water, control the temperature at 100°C, and stir at constant temperature for 2 hours; cool the reaction solution to 80°C, add 10g of sodium peroxide, 10g of 2-naphthalene Phenol, react for 3 hours, cool the reaction solution to 50°C, add 80g of formaldehyde and 80g of phenol with a mass concentration of 37%, react at a constant temperature of 50°C for 30 minutes, and then heat up to 80°C at a rate of 2°C / min , constant temperature reaction for 2 hours; dropwise add 30g of formaldehyde with a mass concentration of 37%, continue the constant temperature reaction for 1 hour, take out 10ml of reactant every 5 minutes, cool t...

Embodiment 3

[0038] Weigh 800g of wheatgrass lignin into a flask, add 4500ml of water, and then add 15g of trifluoroacetic acid, seal it, and acidify it at 110°C for 1 hour. Filter, wash the insoluble matter with water, and then vacuum-dry at 60°C to constant weight to obtain desugared alkali lignin.

[0039] Take 40g of dry alkali lignin powder, add 12g of NaOH, 150g of water, control the temperature at 100°C, and stir for 1 hour; cool the reaction solution to 60°C, add 2g of potassium peroxodisulfate, 3.5g of 2-naphthol, React for 2 hours, add 80g of formaldehyde and 60g of phenol with a mass concentration of 37%, react at a constant temperature at 50°C for 30 minutes, then heat up to 80°C at a speed of 1°C / min, and react at a constant temperature for 1 hour; 30g of 37% formaldehyde, continue to react at constant temperature for 1 hour, take out a small amount of reactant every 15 minutes, cool to 25°C to measure its viscosity, when the viscosity reaches 350mPa.s, quickly cool to room te...

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Abstract

The present invention relates to an environment-friendly alkali-lignin-modified phenolic resin adhesive and a preparation method thereof. The method includes the following steps: water is added into alkali lignin powder, acid is then added, and under a temperature between 100 DEG C and 120 DEG C, acidolysis lasts for one to three hours; desugarized alkali lignin is obtained; the desugarized alkali lignin powder, sodium hydroxide and water are uniformly mixed, oxidant and 2-naphthol are added for reaction, the temperature is reduced to 45 DEG C to 50 DEG C, formaldehyde and phenol are added so that polycondensation reaction occurs, and the environment-friendly alkali-lignin-modified phenolic resin adhesive is prepared. The method adopts acidolysis desugarization to reduce a great deal of alcoholic hydroxyl content in the alkali lignin and modifies the alkali lignin by alkaline hydrolysis, degradation and nucleophilic addition reaction, thus greatly increasing the chemical reaction activity of the alkali lignin, the amount of toxic phenol required in the technique of preparing modified phenolic resin is little, and the residual phenol and formaldehyde are less, so the environment-friendly alkali-lignin-modified phenolic resin adhesive has the advantages of green production technique and product properties.

Description

technical field [0001] The present invention relates to a phenolic resin adhesive, in particular to an environment-friendly alkali lignin modified phenolic resin adhesive and a preparation method thereof. The invention relates to sugar, degradation, nucleophilic addition and polycondensation reactions to prepare an alkali lignin modified phenolic resin adhesive, which belongs to the technical field of wood adhesives. Background technique [0002] The wood adhesives currently used in my country are mainly urea-formaldehyde resin adhesives, followed by phenolic resin adhesives and melamine-formaldehyde resin adhesives. However, the main raw materials of these adhesives are all derived from petrochemical products. The non-renewable nature of petroleum leads to increasing costs and will inevitably be exhausted. Therefore, using renewable raw materials instead of petroleum raw materials to prepare adhesive products with stable performance is a major issues to be faced at present...

Claims

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Application Information

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IPC IPC(8): C09J161/14
Inventor 邱学青欧阳新平杨东杰庞煜霞易聪华
Owner SOUTH CHINA UNIV OF TECH
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