Preparation method for instant dicyandiamide formaldehyde resin

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...

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, low concentration of the obtained aqueous solution, and 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 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, transportation, etc., so a kind of instant solid dicyandiamide-formaldehyde resin is developed to transform the traditional process and reduce 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.