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Production method of melamine-formaldehyde resin

A technology for melamine and a production method, which is applied in the production field of melamine formaldehyde resin, can solve the problems of difficulty in reaching the emission standard, high processing difficulty, high investment cost, etc., and achieves the effects of solving difficult processing problems, easy operation, and eliminating the dehydration process.

Active Publication Date: 2015-02-18
沙县宏盛塑料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like the treatment of melamine-formaldehyde resin wastewater, the treatment of this type of phenolic resin wastewater generally has defects such as large investment costs and high operating costs, and the treatment is difficult and difficult to meet the discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 157kg of waste water (free phenol is 38627.20ppm, free aldehyde is 34863.22ppm, COD is 230283.02ppm) and 18kg of 99.8% methanol are added to the reactor, the pH is adjusted to 9.56 with 40% aqueous sodium hydroxide solution, and 155kg of 98.0% paraformaldehyde is added. , stirred for 10 minutes, then added 250kg of 99.9% melamine, heated to make the material rise to 97°C, took samples to test the cloud point after reacting for a period of time, when reaching the cloud point, added 31kg of 99.5% triethanolamine, stirred for 15 minutes, and discharged.

[0017] After testing, the free formaldehyde in the product is 1.62%, the free phenol is 0.02%, and the solid content is 70.25%.

Embodiment 2

[0019] Add 194kg of waste water (free phenol is 33324.38ppm, free aldehyde is 38667.74ppm, COD is 211472.26ppm) and 12kg of 99.8% methanol into the reactor, adjust the pH to 9.68 with 40% aqueous sodium hydroxide solution, add 150kg of 98.0% paraformaldehyde , stirred for 10 minutes, then added 230 kg of 99.9% melamine, heated to make the material rise to 96 ° C, took samples to test the cloud point after reacting for a period of time, when reaching the cloud point, added 17 kg of 99.5% triethanolamine, stirred for 15 minutes, and discharged.

[0020] After testing, the free formaldehyde in the product was 1.06%, the free phenol was 0.01%, and the solid content was 66.49%.

Embodiment 3

[0022] 116kg of waste water (free phenol is 40515.14ppm, free aldehyde is 34332.62ppm, COD is 241322.32ppm) and 20kg of 99.8% methanol are added to the reactor, the pH is adjusted to 9.71 with 40% aqueous sodium hydroxide solution, and 142kg of 98.0% paraformaldehyde is added. , stir for 10 minutes, then add 260kg of 99.9% melamine, heat the material to raise the temperature to 95°C, take samples to test the cloud point after reacting for a period of time, add 36kg of 99.5% triethanolamine when the cloud point is reached, stir for 15 minutes, and discharge.

[0023] After testing, the free formaldehyde in the product was 1.01%, the free phenol was 0.02%, and the solid content was 72.66%.

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Abstract

The invention discloses a production method of melamine-formaldehyde resin. The production method comprises the following steps of: adding wastewater and methanol into a reaction kettle, using alkali liquor to regulate pH to 9.5-10, then adding paraformaldehyde, and stirring for 5-10min; adding melamine, heating to increase the temperature of the material to 90-100 DEG C, and keeping the constant temperature; and sampling a test cloud point, adding triethanolamine when the could point is reached, stirring for 10-15min, and discharging. According to the production method disclosed by the invention, the treatment problem of phenolic resin wastewater and melamine-formaldehyde resin production wastewater is effectively solved, free phenol and formaldehyde in the phenolic resin wastewater are recycled, and the melamine-formaldehyde resin with specific solid content is produced by controlling the adding amount of the wastewater, thus the production cost is reduced and the production efficiency is improved; and simultaneously, the produced resin is colorless, transparent and good in glossiness, and has good mobility and flexibility, as well as excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a production method of melamine formaldehyde resin. Background technique [0002] Melamine formaldehyde resin has a variety of varieties and is widely used in phenolic molding compounds, fabric finishing agents, adhesives, foam materials and fiber materials for coatings and wood. It is mainly prepared by the reaction of melamine and about 37% formaldehyde aqueous solution, and most of the solid content is less than 60%. The solid content of the prepared resin is determined for a certain formula and the molar ratio of melamine and formaldehyde. To prepare a melamine-formaldehyde resin with a higher solid content, it is necessary to dehydrate the polycondensation product in the later stage of synthesis. At the same time, the method will generate a certain amount of wastewater, which must be treated before it can be discharged. [0003] In the production pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40
Inventor 罗建峰黄世俊朱光明陈银桂陈新卢俊琳
Owner 沙县宏盛塑料有限公司
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