RU2393185C2 - Method of producing organophilic bentonite - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: method of producing organophilic bentonite involves mixing bentonite powder and an aqueous solution of a quaternary ammonium salt - alkylbenzyldimethyl ammonium chloride at room temperature and subsequent drying. The aqueous solution of alkylbenzyldimethyl ammonium chloride used has alkyl hydrocarbon radicals C₈ - C₂₂ with concentration of 3.6-5.0 wt % and mass ratio of bentonite to alkylbenzyldimethyl ammonium chloride of 10:(0.5-0.7). Mixing is done for 10 minutes. The mixture is held for 12 hours and then taken for drying.

EFFECT: invention improves structural properties of organophilic bentonite, cuts on the amount of quaternary ammonium salt for its preparation and enables use of bentonite with low exchange capacity.

1 tbl, 5 ex

Description

The invention relates to the production of organophilic bentonites (bentons) and can be used to obtain varnishes, paints, greases, anhydrous molding compounds, oil-based drilling fluids, etc.

A known method of producing organophilic bentonite (RU No. 2176983 C1, СВВ 33/40, 20.12.2001), comprising mixing a bentonite powder with a quaternary ammonium salt (HOUR). Salts of the type dialkyl dimethyl ammonium chloride with long alkyl hydrocarbon radicals C ₁₆ -C ₁₈ are used as HOUR. HOUR additionally contains isopropyl alcohol and water.

The disadvantages of the method are: the need to introduce HOURS in an amount corresponding to the mass ratio of clay and HOURS 10: 4.85-10: 5.18; the use of bentonite with a high exchange capacity; the introduction of the estimated number of HOURs for 8-20 minutes at a pressure the value of which is determined from the ratio 0 <P _cm <1 atm.

The closest analogue (prototype) is a method for producing organophilic bentonite (AS USSR No. 1816784, С09К 3/00, 05/23/93), including mixing bentonite powder with an aqueous solution of Quaternary ammonium salt (HOUR) at a mass ratio of bentonite and salt 10 : 4-10: 6 and subsequent drying. The reaction is carried out in an aqueous solution of HOUR 30-60% concentration at a temperature of 15-25 ° C for 0.5-0.7 hours

Bentonite of the Askanskoye deposit is used, according to published data it is characterized by an alkaline type of ion-exchange complex with a high exchange capacity. As the HOUR, alkylbenzyldimethylammonium chloride with C ₁₀ -C ₁₇ and C ₁₇ -C ₂₀ alkyl hydrocarbon radicals is used.

The disadvantage of this method is the need for the introduction of HOURS in an amount corresponding to the mass ratio of clay and HOURS 10: 4-10: 6; the use of bentonite with a high exchange capacity.

The objective of the present invention is to obtain organophilic bentonite with improved structure-forming properties with a significant reduction in the amount of quaternary ammonium salt necessary for the preparation of organophilic bentonite based on alkaline earth bentonite having a low exchange capacity; and a significant economic effect due to a reduction in raw material costs - with a significant reduction in the amount of expensive expensive Quaternary ammonium salt consumed and the use of cheaper alkaline earth bentonite (almost all Russian bentonites are alkaline earth and their properties can approach the properties of natural alkaline bentonites only after activation).

The problem, according to the invention, is solved by mixing at room temperature a bentonite powder and an aqueous solution of a quaternary ammonium salt - alkylbenzyldimethylammonium chloride with C ₈ -C ₂₂ alkyl hydrocarbon radicals, with a mass ratio of bentonite and salt of 10: 0.5-10: 0, 7 and the concentration of an aqueous salt solution of 3.6-5.0 wt.% Stirring for 10 minutes, keeping the mixture for 12 hours at room temperature and drying of bentonite.

The method is as follows.

Bentonite powder at room temperature is mixed with a quaternary ammonium salt - alkylbenzyldimethylammonium chloride with C ₈ -C ₂₂ alkyl hydrocarbon radicals, with a mass ratio of bentonite and salt of 10: 0.5-10: 0.7 and an aqueous salt solution concentration of 3.6-5 , 0 wt.%, Stirred for 10 minutes, incubated for 12 hours and dried.

The proposed method allows you to: get organophilic bentonite, which has the best structure-forming properties, compared with the known, with a significant reduction in the amount of quaternary ammonium salt required to obtain organobentonite (5.7 - 12 times) and the use of alkaline earth bentonite. Given the cost of quaternary ammonium salts (about 100,000 rubles / kg) and bentonite, the method makes it possible to significantly reduce the cost of the finished product and obtain a significant economic effect in the production of organophilic bentonite.

The technical result obtained is ensured by the fact that, when preparing the organophilic bentonite by the proposed method, the optimal structure of the adsorbed quaternary ammonium salt layer is formed on the bentonite surface, while excessive lyophilization of the bentonite surface (superequivalent adsorption of the quaternary ammonium salt) in the known method leads to a decrease in the structure formation in the varnish .

The structure-forming properties of organophilic bentonite were evaluated by the viscosity of the paint composition at a temperature of 25 ° C according to GOST 8420-74. For the assessment used paint composition composition:

varnish PF 060, g 280,0 titanium oxide (pigment), g 66.5 chalk, g 133 organophilic bentonite, g 2

To prepare the paint composition in a metal glass, 100 g of varnish, titanium oxide, chalk and organophilic bentonite were successively mixed. The composition was milled in a bead mill, for which 200 g of grinding media with a diameter of 1-2 mm was added to the mixture of components. Grinding of the composition was carried out for 25 minutes at a rotational speed of the mill shaft of 800-900 rpm, after which 180 g of varnish was added to the composition, mixed for another 10 minutes and the grinding media were separated.

To implement the method using bentonite powder. In particular, bentonite powder of the Tarasovskoye deposit in the Rostov region can be used.

Example 1

The ratio of bentonite powder and quaternary ammonium salt (alkylbenzyldimethylammonium chloride with C ₁₇ -C ₂₀ alkyl hydrocarbon radicals) is 10: 4. The concentration of the aqueous solution of the Quaternary ammonium salt is 40 wt.%.

22.22 g of a quaternary ammonium salt are added to 33.34 g of water and 44.44 g of bentonite powder is added with stirring. Stirring is continued for 0.5-0.7 hours. Organophilic bentonite is dried in a fluidized bed dryer.

The viscosity of the paint composition with the addition of organophilic bentonite is 248 s ^-1 .

Example 2

The ratio of bentonite powder and quaternary ammonium salt (alkylbenzyldimethylammonium chloride with C ₈ -C ₂₂ alkyl hydrocarbon radicals) is 10: 0.2. The concentration of the aqueous solution of Quaternary ammonium salt is 1.5 wt.%.

30 g of bentonite powder at room temperature are mixed with 40.6 g of an aqueous solution of Quaternary ammonium salt, stirred for 10 minutes, kept for 12 hours and dried.

The viscosity of the paint composition with the addition of organophilic bentonite is 237 s ^-1 .

Example 3

The ratio of bentonite powder and quaternary ammonium salt (alkylbenzyldimethylammonium chloride with C ₈ -C ₂₂ alkyl hydrocarbon radicals) is 10: 0.5. The concentration of the aqueous solution of Quaternary ammonium salt is 3.6 wt.%.

30 g of bentonite powder at room temperature is mixed with 41.5 g of an aqueous solution of Quaternary ammonium salt, stirred for 10 minutes, kept for 12 hours and dried.

The viscosity of the paint composition with the addition of organophilic bentonite is 262 s ^-1 .

Example 4

The ratio of bentonite powder and quaternary ammonium salt (alkylbenzyldimethylammonium chloride with C ₈ -C ₂₂ alkyl hydrocarbon radicals) is 10: 0.7. The concentration of the aqueous solution of the Quaternary ammonium salt is 5.0 wt.%.

30 g of bentonite powder at room temperature is mixed with 42.1 g of an aqueous solution of Quaternary ammonium salt, stirred for 10 minutes, incubated for 12 hours and dried.

The viscosity of the paint composition with the addition of organophilic bentonite is 259 s ^-1 .

Example 5

The ratio of bentonite powder and quaternary ammonium salt (alkylbenzyldimethylammonium chloride with C ₈ -C ₂₂ alkyl hydrocarbon radicals) is 10: 1.0. The concentration of the aqueous solution of the Quaternary ammonium salt is 7.0 wt.%.

30 g of bentonite powder at room temperature are mixed with 43 g of an aqueous solution of Quaternary ammonium salt, stirred for 10 minutes, incubated for 12 hours and dried.

The viscosity of the paint composition with the addition of organophilic bentonite is 234 s ^-1 .

Comparative data on the assessment of the structure-forming properties of paint compositions obtained using the proposed and well-known organophilic bentonites are shown in the table.

Organophilic Bentonite The ratio of bentonite: HOUR, wt.% The viscosity of the paint composition, s ^-1 Without organophilic bentonite - 212 Example 1 (known method) 10: 4-10: 6 248 Example 2 (the proposed method) 10: 0.2 237 Example 3 (the proposed method) 10: 0.5 262 Example 4 (the proposed method) 10: 0.7 259 Example 5 (the proposed method) 10: 1,0 234

The optimal ratio of clay - Quaternary ammonium salt is 10: 0.5-10: 0.7. The introduction of a quaternary ammonium salt in a smaller amount is insufficient to improve the structure-forming properties of bentonite. An increase in the consumption of quaternary ammonium salt does not improve the quality indicators when introduced into the paint composition.

The invention improves the structure-forming properties of organophilic bentonite; significantly reduce the amount of quaternary ammonium salt necessary to obtain organophilic bentonite; use bentonites with a low exchange capacity.

Claims (1)

A method of producing organophilic bentonite, including mixing at room temperature a bentonite powder and an aqueous solution of a quaternary ammonium salt - alkylbenzyldimethylammonium chloride and subsequent drying, characterized in that an aqueous solution of alkylbenzyl dimethylammonium chloride with a C ₈ -C ₂₂ alkyl hydrocarbon radical concentration of 3.6-5 is used, 0 wt.% With a mass ratio of bentonite and alkylbenzyl dimethylammonium chloride 10: (0.5-0.7), mixing is carried out for 10 minutes, then kept for 12 hours and then sent to su ku.