Preparation method for instant dicyandiamide formaldehyde resin

A technology of formaldehyde resin and dicyandiamide, which is applied in the field of preparation of instant dicyandiamide-formaldehyde resin, can solve the problems of high preparation cost, poor stability of liquid dicyandiamide-formaldehyde resin, large investment, etc., and achieve solution stability Problems, good water solubility, large investment effect

Inactive Publication Date: 2007-05-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for this result is that the liquid dicyandiamide-formaldehyde resin produced by the traditional process has low stability and is prone to gelation and failure, that is, before it is converted into a solid product, it has been denatured and gelled. glue, failure
[0006] To manufacture solid dicyandiamide-formaldehyde resin by traditional technology, it is necessary to prepare liquid dicyandiamide-formaldehyde resin first, and then, according to the principle of phase transfer, undergo complex processes such as repeated crystallization, separation, and drying of acetone-absolute ethanol dual solvents. , large investment, high preparation cost, serious environmental pollution, and the obtained solid dicyandiamide-formaldehyde resin is jelly, poor solubility, difficult redissolution,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 24.41g of analytically pure polyoxymethylene and 41.45g of water, and pump them into the hydroxymethylation reaction pot; add 23.43g of chemically pure dicyandiamide and 3.10g of industrial ammonium chloride, adjust the pH value to 9.5 with NaOH, and raise the temperature to 70°C , constant temperature reaction for 1.5h; transferred to the polymerization reactor, added 7.44g of industrial ammonium chloride, adjusted the pH value to 4.0 with HCl, and reacted at 75°C for 1.5h; then transferred to the conditioning pot, cooled to 55°C, and added 0.17g Industrial methanol, continue to react for 0.3h to obtain liquid dicyandiamide-formaldehyde resin, then discharge the material, and vacuum spray dry to obtain a colorless glass bead crystal instant solid dicyandiamide-formaldehyde with uniform particle size resin.

Embodiment 2

[0026] Weigh 25.47kg of chemically pure polyoxymethylene and 39.90kg of water, pump into the methylolation reaction pot; add 25.62kg of analytically pure dicyandiamide and 2.59kg of industrial ammonium chloride, and use Ca(OH) 2 Adjust the pH value to 7.5, raise the temperature to 75°C, and react at a constant temperature for 2.5 hours; transfer to the polymerization reactor, add 6.22kg of industrial ammonium chloride, adjust the pH value to 6.8 with HCl, and react at 85°C for 5.0 hours; then transfer to conditioning pot, lower the temperature to 65°C, add 0.20kg of pure ethanol for analysis, and continue the reaction for 1.0h; the liquid dicyandiamide-formaldehyde resin can be obtained, and then discharged, and dried by a drum steam dryer to obtain a crystal clear Amorphous colorless crystalline instant solid dicyandiamide-formaldehyde resin.

Embodiment 3

[0028] Take by weighing 665.4kg of formaldehyde waste liquid (containing 34.81% of formaldehyde, equivalent to 231.6kg of formaldehyde and 433.8kg of water), pumped into the methylolation reaction pot; add 225.7kg of industrial dicyandiamide and 37.3kg of analytically pure ammonium chloride, Adjust the pH value to 9.0 with KOH, raise the temperature to 85°C, and react at a constant temperature for 4.0 hours; transfer to a polymerization reactor, add 69.7kg of analytically pure ammonium chloride, adjust the pH value to 5.0 with HCl, and react at a temperature of 90°C for 3.0 hours; then Transfer to a conditioning pot, lower the temperature to 70°C, add 1.9kg of analytically pure propanol, and continue the reaction for 0.8h; the liquid dicyandiamide-formaldehyde resin can be prepared, discharged, and dried by a high-speed spray dryer to obtain a Color powder crystal instant solid dicyandiamide-formaldehyde resin.

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PUM

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Abstract

The invention discloses a preparing method of rapid soluble typed dicyandiamide, which comprises the following steps: adding 23.16-25.85% formaldehyde, 39.30-43.38% water, 22.57-25.62% dicyandiamide and 2.59-3.73% amchlor into reacting stove sequently; heating to 70-85 Deg C; adjusting pH value at 7.5-9.5; reacting 1.5-5.5h thermostatically; moving the material into polymeric autoclave; supplementing 6.22-7.44% amchlor; controlling the temperature at 75-95Deg C with pH value at 4.0-6.8 for 1.5-5.0h; moving to opsonizing stove; controlling the temperature at 55-70 Deg C; adding 0.17-0.20% primary alcohol for 0.3-1.0h; obtaining liquid dicyandiamide formaldehyde resin; drying directly; obtaining the product.

Description

technical field [0001] The invention relates to a dicyandiamide-formaldehyde resin in the field of fine chemicals, in particular to a preparation method of an instant dicyandiamide-formaldehyde resin. Background technique [0002] Dicyandiamide-formaldehyde resin is a kind of important cationic polymer and cationic chemical additives, widely used in many fields: as decolorizer in environmental protection industry, as color fixing agent in printing and dyeing industry, as wet end in paper industry Strengthening agent, used as a leather tanning agent in the leather industry, as an emulsion coagulant in the production process of styrene-butadiene rubber, as an adhesive, flame retardant and lubricant for glass fiber in wood fiberboard. [0003] The dicyandiamide-formaldehyde resin developed with dicyandiamide and formaldehyde as the main raw materials has been published in books, newspapers and periodicals since the 1940s, and a large number of scientific papers and patented tec...

Claims

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Application Information

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IPC IPC(8): C08G12/16
Inventor 阮复昌
Owner SOUTH CHINA UNIV OF TECH
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