RU1830071C - Process for preparing water soluble formaldehyde-containing products - Google Patents

Abstract

A process for preparing water soluble formaldehyde-containing products. Usage: the proposed water-soluble formaldehyde-containing products modified with lignosulfonate are used as additives to drilling fluids. Essence: the method provides for the production of water-soluble formaldehyde-containing products by reaction by heating melamine, formaldehyde and lignosulfonate in their ratio. wt.% equal to 3.5-11, 0: 0.03-3.7: 85-97 to form a product with a viscosity of 5-250 cP. s / s

Description

The invention relates to methods for producing water-soluble, non-curing products based on melamine-formaldehyde oligomers modified with lignosulfonates and used as additives to drilling fluids.

The aim of the invention is to simplify technology, increase process safety and save raw materials.

This is achieved by the fact that a water-soluble formaldehyde-containing product is obtained by the combined condensation of melamine, formaldehyde and lignosulfonate at a ratio of wt.%: 3.5-11: 0.03-3.7: 85-97, respectively. The pH of the reaction medium is created by the pH of the starting materials of the synthesis.

The essence of the invention is the creation of a new process for the production of a water-soluble formaldehyde-containing product used in drilling technology by the combined condensation of melamine, formaldehyde and lignosulfonate in a certain ratio thereof. New significant distinguishing features are the use of a new composition of products, a new ratio of these products and a method for interacting with these products.

The proposed method is as follows: lignosulfonate, formalin and water are charged, the pH of the reaction mixture is adjusted to 4.5-5.6, due to the acids contained in lignosulfonate and formalin, they are heated to 90-95 ° C with stirring and introduced into the reaction melamine, synthesize to a viscosity of a 20% solution of 5-250 cP.

B.g The traditional sodium, potassium, calcium and ammonium lignosulfonates are used as the lignosulfonate (TU 13-0281036-05-89).

Example 1. Download 1010.4 g (85.3 wt.%) Of 50% sodium lignosulfonate and 0.8 g (3.7 wt.%) Of 37% formalin, heated to 90 ° C with stirring and 126 g (11% by weight) of melamine are added. At this temperature, a viscosity of 20% solution is condensed - 10.0 cP.

Example 2, 6,120 g (96.47 wt.%) Of 50% potassium lignosulfonate and 486.5 t (0.03 may.) Of 37% formalin are charged to 95 ° C. with stirring and 126 g (3.5 wt.%) with chalk - 1 n1 | . this temperature is condensed to “IWkrjc ™ 20% solution - 5.0 cP. } OK and measure 3. Download 475.4 g (90.9 wt.%) Of 50% calcium lignosulfonate, 209.2 g of water and 55.2 g of 36.2% formalin (3.7 wt.% ) With stirring, it is heated to a temperature of 95 ° C and 28 g (5.4% by weight) of melamine are added. At this temperature, a viscosity of 20% solution is condensed at 250 cP.

Example 4. Download 380.3 g (94 wt.%) Of 50% ammonium lignosulfonate, 98.8 g of water and 27.6 g (May 2.5.%) Of a 36.2% formalin solution, with stirring heated to a temperature of 90 ° C and 14 g (3.5 wt.%) of melamine were added. At a temperature of 90 ° C, they are mixed to a viscosity of 20% solution - 20.5 cP.

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Example 5. Download 260/4 g (93.5 wt.%) Of 50% sodium lignosulfonate, 65 g of water and 16.2 g (2.0 wt.%) Of 37% formalin, heated to 95 with stirring ° C and 12.6 g (4.5% by weight) of melamine are added. At this temperature, a viscosity of 20% solution is condensed at 43.0 cP.

From the above examples it follows that the proposed method is extremely simple, there is no control of the pH of the reaction medium. The synthesis of the finished product proceeds in one stage without methanol. The required pH is adjusted by the pH of the starting materials. Using the proposed method saves severely deficient raw materials - melamine and formalin. Special equipment is not required for the implementation of the process; it can be produced in existing plants with urea and melamine formaldehyde resins and lignosulfonate reagents.

Claims (1)

SUMMARY OF THE INVENTION A method for producing water-soluble formaldehyde-containing products by the interaction of melamine, formaldehyde in the presence of lignosulfonate by heating, characterized in that, in order to intensify the process, the interaction of melamine, formaldehyde and lignosulfonate is carried out in a mass ratio of 3.5-11: 0.03-3. 7: 85-97 to obtain a product with a viscosity of 5-250 cP;