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A green preparation process of phenolic resin without waste water discharge

A phenolic resin and preparation process technology, applied in the field of green phenolic resin preparation process, can solve the problems of high concentration of reaction products, severe reaction heat release, overflow of the kettle, etc., and achieve the effect of easy large-scale batch production, simple process and stable reaction

Active Publication Date: 2015-08-19
JIANGSU FENGMANG COMPOUND MATERIAL SCI&TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the other hand, due to the reaction between paraformaldehyde and phenol, due to the high concentration of the reaction product, the exothermic heat of the reaction is severe. For large-scale batch preparation, production accidents such as detonation and overflow of the kettle are often caused by the intense exothermic reaction, resulting in casualties. and property damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This example is a green preparation process of phenolic resin without waste water discharge. First, molten phenol is added to the reactor, and then the temperature is raised to 50°C. Then, the screw pump is used to divide the paraformaldehyde and the catalyst into the reactor for 4 times on average. In the reactor, the paraformaldehyde and the catalyst are added within 4 hours. After the addition of the paraformaldehyde and the catalyst, continue to keep warm at 75 ° C until the material reaches the expected viscosity, and then cool down and discharge the material to obtain a phenolic resin product.

[0017] Wherein the molar ratio of paraformaldehyde and phenol is 0.5:2.0; the molar ratio of catalyst and phenol is 0.1%; wherein the catalyst is sodium hydroxide.

Embodiment 2

[0019] This example is a green preparation process of phenolic resin without waste water discharge. First, molten phenol is added to the reactor, and then the temperature is raised to 70°C. Then, the screw pump is used to divide 5 times and the paraformaldehyde and catalyst are fed into the reactor on average. In the reactor, the paraformaldehyde and the catalyst are added within 5 hours. After the paraformaldehyde and the catalyst are added, continue to keep warm at 80°C until the material reaches the expected viscosity, and then cool down and discharge the material to obtain a phenolic resin product.

[0020] Wherein the molar ratio of paraformaldehyde and phenol is 1.0:1.0; the molar ratio of catalyst and phenol is 0.3%. Wherein the catalyst is potassium hydroxide.

Embodiment 3

[0022] This example is a green preparation process of phenolic resin without waste water discharge. First, molten phenol is added to the reactor, and then the temperature is raised to 90°C. Then, the screw pump is used to divide 6 times and the paraformaldehyde and catalyst are fed into the reactor on average. In the reactor, the paraformaldehyde and the catalyst are added within 3 hours. After the paraformaldehyde and the catalyst are added, the heat preservation is continued at 85° C. until the material reaches the expected viscosity, and then the temperature is lowered and the material is discharged to obtain a phenolic resin product.

[0023] Wherein the molar ratio of paraformaldehyde and phenol is 2.0:0.5; the molar ratio of catalyst and phenol is 0.5%. Wherein the catalyst is a mixture of ammonia and sodium carbonate.

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Abstract

The invention relates to an environment-friendly phenolic resin preparation process without wastewater discharge. The process comprises the following steps: firstly, adding molten phenol into a reactor; then heating to 50 DEG C to 90 DEG C; starting and continuously adding paraformaldehyde and a catalyst for 2 to 5 hours and controlling heat release during a reaction according to the adding rate of the paraformaldehyde and the catalyst; further reacting in a heat preservation manner until the desired viscosity of materials is achieved after the adding of the paraformaldehyde and the catalyst; and then cooling and discharging, thereby obtaining a phenolic resin product. The thermosetting phenolic resin is prepared by replacing the existing liquid formaldehyde with the paraformaldehyde; the smooth reaction of the paraformaldehyde and the phenol is realized by controlling the adding mode of the paraformaldehyde and the catalyst as well as the reaction temperature and the reaction time, so that the difficult problem that the heat release during the high-concentration reaction of the paraformaldehyde and the phenol is too drastic so as to be difficult to control is solved.

Description

technical field [0001] The invention relates to a preparation process of phenolic resin, in particular to a green preparation process of phenolic resin using paraformaldehyde raw material without waste water discharge. Background technique [0002] As an industrial adhesive, phenolic resin is widely used in construction, transportation, aerospace and other fields, but at present, phenolic resin is mostly prepared by reacting phenol and liquid formaldehyde (37% formaldehyde aqueous solution). Because the reaction raw materials contain a large amount of water, a large amount of waste water is inevitably produced in the process of preparing phenolic resin, and about 500-700Kg of waste water is produced per ton of phenolic resin. These wastewaters have caused great difficulties to the subsequent wastewater treatment, and have become a bottleneck problem restricting the development of the phenolic resin industry. [0003] Using paraformaldehyde (solid formaldehyde) instead of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10
Inventor 范江峰赵彤李昊关广利
Owner JIANGSU FENGMANG COMPOUND MATERIAL SCI&TECH GRP CO LTD
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