Preparation method for instant dicyandiamide formaldehyde resin

A technology of formaldehyde resin and dicyandiamide, 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. Problems, good water solubility, and the effect of large investment

Inactive Publication Date: 2009-03-18
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 is not stable 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 to redissolve, low concentration of the obtained aqueous solution, practical application is very inconvenient, generally limited to experiments It is difficult to adapt to the actual needs of large-scale industrial production and high-efficiency production.
[0007] Considering that the stability of the liquid dicyandiamide-formaldehyde resin produced by the traditional process is very poor, and it is quite inconvenient in terms of packaging, storage, and transportation, so a kind of instant solid dicyandiamide-formaldehyde resin is developed to transform the traditional process and reduce the It has very important theoretical value and practical significance to reduce production cost, eliminate environmental pollution, improve dissolution rate and application effect, and improve product comprehensive performance.

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 produce 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 to react for 1.0h; the liquid dicyandiamide-formaldehyde resin can be prepared, and then discharged, and dried by a drum-type 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 the 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 obtained, and the material is discharged and dried by a high-speed spray dryer to obtain a free Color powder crystal instant solid dicyandiamide-formaldehyde resin.

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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 additive, which is widely used in many fields: it is used as decolorizing agent in environmental protection industry, used as color fixing agent in printing and dyeing industry, and used 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 numb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/16
Inventor 阮复昌
Owner SOUTH CHINA UNIV OF TECH
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