Preparation method of pulping waste liquid adhesive

A technology for pulping waste liquid and adhesive, which is applied in the direction of adhesive, adhesive type, aldehyde/ketone condensation polymer adhesive, etc., can solve the problems of waste liquid pollution, etc. Effects of low levels of phenols and free aldehydes

Inactive Publication Date: 2012-06-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low production cost, simple process, and strong operability, which not only solves the problem of waste liquid pollution to the environment, but also makes full use of the pulping waste liquid, turning waste into treasure, and realizing pulping waste Preparation method of pulping waste liquid adhesive for liquid resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Phenolic modification of pulping waste liquor

[0028] Under the action of alkaline catalyst and phenol, phenolization modification is carried out at 90°C on the kraft pulping waste liquid; the pulping waste liquid is physically filtered and concentrated, and its solid content is 25.0-45.0%. The mass ratio of pulping waste liquid to phenol is 1.0:0.1, the amount of alkaline catalyst sodium hydroxide is 2.0% of the total mass of pulping waste liquid and phenol, and the phenolization modification time is 4.0h;

[0029] 2) Synthesis of pulping waste liquid adhesive

[0030] Add aldehyde and basic catalyst to the pulping waste liquid after phenolization modification, under stirring, react at 55°C for 3 hours, then add urea, raise the temperature to 95°C and continue the reaction for 0.5h, stop heating when the viscosity is 500-900mPa·s, Cool to room temperature, discharge and serve;

[0031] Wherein the mol ratio of phenol and formaldehyde solution is 1.0: 1.5, the con...

Embodiment 2

[0033] 1) Phenolic modification of pulping waste liquor

[0034] Under the action of alkaline catalyst and phenol, the caustic soda pulping waste liquid is phenolized and modified at 120°C; the pulping waste liquid is physically filtered and concentrated, and its solid content is 25.0-45.0%. The mass ratio of waste liquid to cresol is 1.0:0.5, the amount of alkaline catalyst potassium hydroxide is 3.5% of the total mass of pulping waste liquid and phenol, and the phenolization modification time is 0.5h;

[0035] 2) Synthesis of pulping waste liquid adhesive

[0036] Add aldehyde and basic catalyst to the pulping waste liquid after phenolization modification, under stirring, react at 70°C for 1 hour, then add urea, raise the temperature to 85°C and continue the reaction for 1 hour, stop heating when the viscosity is 500-900mPa·s, cool to room temperature, put the ingredients and serve;

[0037] Wherein the mol ratio of phenol and solid formaldehyde is 1.0: 1.8, the consumptio...

Embodiment 3

[0039] 1) Phenolic modification of pulping waste liquor

[0040] Under the action of alkaline catalyst and phenol, the chemical mechanical pulping waste liquid is phenolized and modified at 100 °C; the pulping waste liquid is physically filtered and concentrated, and its solid content is 25.0-45.0%. The mass ratio of pulping waste liquid to xylenol is 1.0:0.8, the amount of alkaline catalyst sodium hydroxide and sodium carbonate is 4.2% of the total mass of pulping waste liquid and phenol, and the phenolization modification time is 1h;

[0041] 2) Synthesis of pulping waste liquid adhesive

[0042] Add aldehyde and basic catalyst to the pulping waste liquid after phenolization modification, under stirring, react at 65°C for 1.5h, then add urea, raise the temperature to 90°C and continue the reaction for 2h, stop heating when the viscosity is 500-900mPa·s, Cool to room temperature, discharge and serve;

[0043] Wherein the mol ratio of phenol and furfural is 1.0: 1.6, and the...

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Abstract

The invention provides a preparation method of a pulping waste liquid adhesive and belongs to the technical field of adhesives. The preparation method comprises the following steps of: firstly carrying out phenolic modification on pulping waste liquid at a temperature of 90-140 DEG C under the action of a basic catalyst and phenol by adopting a normal-pressure or high-pressure heating method; and then adding aldehyde and the basic catalyst into the pulping waste liquid subjected to the phenolic modification, reacting for 1.0-3.0 hours at a temperature of 55-70 DEG C under the condition of continuous agitation, adding urea accounting for 0.2-2.0 percent of the total weight of the phenol, aldehyde and the pulping waste liquid, raising the temperature to 80-95 DEG C, continuously reacting for 0.5-3.0 hours, stop heating when the viscosity conforms to the requirements, cooling to below 40 DEG C and discharging. The invention has the beneficial effects that compared with a traditional phenolic resin adhesive, the prepared adhesive has the characteristics of lower production cost, low free phenol and free aldehyde content and environment friendliness; and in the preparation method, the pulping waste liquid is fully utilized, the pollution caused by the waste liquid to the environment is solved, and the resource utilization of the pulping waste liquid is realized.

Description

technical field [0001] The invention belongs to the technical field of adhesives, in particular to a preparation method of pulping waste liquid adhesive. Background technique [0002] The pulp and paper industry produces a large amount of waste liquid every year, and the treatment of pulping waste liquid is basically concentrated and then burned or even directly discharged into rivers. This not only wastes resources, but also causes serious pollution to the environment. In order to make full use of the organic matter in the pulping waste liquid, the pulping waste liquid is used to partially replace phenol or formaldehyde to synthesize the phenolic adhesive, which not only reduces the production cost, reduces the residual amount of formaldehyde, but also reduces the pollution of the pulping waste liquid to the environment and realizes waste disposal. resource utilization. [0003] Chinese patents CN101191038A and CN101928536A disclose methods for modifying phenolic adhesives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/14C08G8/28C08H8/00
Inventor 韩卿张大鹏
Owner SHAANXI UNIV OF SCI & TECH
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