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Wastewater zero discharge preparing method of thermoplastic phenolic resin

A phenolic resin and thermoplastic technology, which is applied in the field of phenolic resin preparation, can solve unsatisfactory problems, achieve the effect of no performance degradation, great environmental protection significance, and break through the environmental protection bottleneck

Active Publication Date: 2013-04-24
JIANGSU FENGMANG COMPOUND MATERIAL SCI&TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Throughout the various treatment methods of phenolic resin, whether it is chemical extraction method, chemical conversion method, biological oxidation method, biodegradation method, or absorption method, electrolysis method, etc., although each has its own advantages, they are all based on waste treatment. Phenol-containing wastewater is still effective, but it is not ideal for high-concentration phenol-containing wastewater discharged from phenolic resin production

Method used

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  • Wastewater zero discharge preparing method of thermoplastic phenolic resin

Examples

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Embodiment 1

[0027] This embodiment is a method for preparing thermoplastic phenolic resin with zero waste water discharge, and the specific process is as follows:

[0028] Add 400g of phenol, 85g of paraformaldehyde, 3.0g of oxalic acid (20wt%), and 150g of water into a four-necked flask equipped with a stirring and condenser and mix. Heat up to boiling reflux, react for 3 hours; heat up to 110°C for dehydration reaction, then cool down to 100°C, then heat up to boiling reflux, react for 1 hour, until the resin viscosity reaches 2000mPa.s25°C, add 1.0g sodium hydroxide to adjust The pH value of the resin reaches 6, and then continues to heat up and dehydrate until the temperature reaches 160°C, and then the thermoplastic phenolic resin can be obtained. The number average molecular weight Mn of the resin is 734, the weight average molecular weight Mw is 1535, the softening point is 129°C, and the free phenol content is 4.22%.

Embodiment 2

[0030] This embodiment is a method for preparing thermoplastic phenolic resin with zero waste water discharge, and the specific process is as follows:

[0031] 500g of cresol, 100g of paraformaldehyde, 3.4g of phosphoric acid, and 150g of water were added to a four-necked flask equipped with a stirring and condenser for mixing. Heat up to boiling reflux, react for 2 hours; heat up dehydration reaction to 109°C, then cool down to 90°C, then heat up to boiling reflux, react for 2 hours, until the resin viscosity reaches 2500mPa.s25°C, add 0.8g sodium hydroxide to adjust The pH value of the resin reaches 5.8, and then continues to heat up and dehydrate until the temperature reaches 165° C., and then a thermoplastic phenolic resin can be obtained. The number average molecular weight Mn of the resin is 825, the weight average molecular weight Mw is 1788, the softening point is 135°C, and the free phenol content is 3.95%.

Embodiment 3

[0033] This embodiment is a method for preparing thermoplastic phenolic resin with zero waste water discharge, and the specific process is as follows:

[0034] Add 450g of xylenol, 90g of paraformaldehyde, 3.2g of sulfuric acid, and 150g of water into a four-necked flask equipped with a stirring and condenser and mix them. Heat up to boiling reflux, react for 4 hours; heat up dehydration reaction to 105°C, then cool down to 80°C, then heat up to boiling reflux, react for 3 hours, until the resin viscosity reaches 2300mPa.s25°C, add 0.9g of barium hydroxide to adjust The pH value of the resin reaches 5.0, and then continues to heat up and dehydrate until the temperature reaches 170°C, and then the thermoplastic phenolic resin can be obtained. The number average molecular weight Mn of the resin is 805, the weight average molecular weight Mw is 1532, the softening point is 132°C, and the free phenol content is 3.99%.

[0035] product name Thermal stability (initial th...

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Abstract

The invention relates to a wastewater zero discharge preparing method of thermoplastic phenolic resin. The wastewater zero discharge preparing method includes: respectively weighing phenol and solid aldehyde according to a molar ratio of 1:0.8-1.0, and weighing acid according to a weight ratio of the acid and the aldehyde of 0.5-4:100; mixing the phenol, the acid and the solid aldehyde, adding a proper amount of water, heating to boil, and reflowing for 2-4 hours, wherein the weight of the proper amount of water is 1.0-2.5 times of the total added weight of the aldehyde; heating and dewatering reactants, then cooling the reactants to 80-100DEG C, heating the reactants to boil, and reflowing for 1-3 hours; detecting whether viscosity of the reactants reaches a requirement, if yes, adding alkali and adjusting hydrogen ion concentration (PH) value to range from 4 to 7; and heating and dewatering the reactants to obtain the thermoplastic phenolic resin. The wastewater zero discharge preparing method of the thermoplastic phenolic resin achieves wastewater zero discharge and guarantees that own performances of the phenolic resin can not be reduced.

Description

technical field [0001] The invention relates to a method for preparing a phenolic resin, in particular to a method for preparing a thermoplastic phenolic resin with zero waste water discharge. Background technique [0002] Phenolic resin, PF for short, is the earliest industrialized synthetic resin. As one of the three thermosetting resins, phenolic resin has a wide range of applications, a large quantity, and a long history of development. There are two most important features of phenolic resin: one is high temperature resistance, even at very high temperature, it can maintain its structural integrity and dimensional stability. For this reason, phenolic resins are used in some high-temperature fields, such as refractory materials, friction materials and foundry industries. The second is that it has a certain bonding strength. Another important application field of it is as an adhesive, which plays an irreplaceable role in various important fields of the national economy s...

Claims

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Application Information

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IPC IPC(8): C08G8/04C08G8/10
Inventor 范江峰
Owner JIANGSU FENGMANG COMPOUND MATERIAL SCI&TECH GRP CO LTD
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