RU2706319C1 - Silicone antifoaming agent for laundry detergents - Google Patents

Abstract

FIELD: washing.

SUBSTANCE: invention relates to a silicone-based antifoaming composition for use in a powdered detergent that is intended for washing laundry in an automatic washing machine to prevent excessive foaming. Composition contains a liquid siloxane component and a hydrophobic finer filler. At that, the silicone antifoaming agent composition consists of a mixture of linear, branched and cyclic oligodimethylsiloxanes with trimethylsiloxy- and hydroxy groups with kinematic viscosity at 20 °C from 150 to 400 mm²/s, and content of hydroxyl groups of 0.24–0.32 % – 14–17 wt%, mixture of quaternary ammonium salts of high-molecular compounds of fatty series – 2-2.5 wt%, methyl siliceum – 0.5–1.0 wt%, a mixture of sodium methyl siliconate and sodium ethyl siliconate, taken in ratio of 1:1.5 – 1.5–2.5 wt%, and sodium carbonate or sodium sulphate – 77–82 wt%.

EFFECT: obtaining a loose composition of an antifoaming agent with improved defoaming properties, high storage resistance, use of the proposed defoamer reduces harmful effect on metal parts of washing machines.

1 cl, 2 tbl, 6 ex

Description

The present invention relates to silicone-based defoamers for use in a powder detergent that is intended for washing laundry in an automatic washing machine to prevent excessive foaming.

Defoamers are a special composition that reduces the formation of foam, which is a dry powder or granules consisting of a composition of various organic and organosilicon compounds with a hydrophobic filler.

Silicone defoamers are much more effective than organic defoamers in terms of antifoam ability, in addition, they work much faster and last longer, have an economical consumption and are used in a wide temperature range from minus 40 ° С to 250 ° С. In various industries, antifoam agents are considered an important component in many processes. So, in the pulp and paper industry, antifoam agents improve the quality and purity of products, during metal processing they contribute to washability and prevent the spread of impurities, and increase the speed of oil production. Silicone antifoam agents are characterized by low toxicity, non-volatility, and the ability to work in various environments.

In the washing machines of the activator type and during hand washing, you can wash clothes with any washing powder, even with uncontrolled foaming. In automatic washing machines, the use of such powders causes foam to creep out along with the liquid from under the drum lid, leaks in the door and powder compartments, clogged machine hoses, and hit the electric motor. Therefore, it is important to maintain the formation of foam to an acceptable level, for which purpose special antifoam agents are introduced into the powder composition to prevent the appearance of excess foam, which can seriously damage the washing machine.

Currently, there is a wide range of antifoam compositions for silicone-based washing powder used to extinguish foam during the washing process in an automatic washing machine.

Known antifoam composition containing a homogeneous mixture of organopolysiloxane, in which the siloxane units consist essentially of 0-60% of the units of the general formula R _a SiO _{(4-a / 2)} , where R is a hydrocarbon group having up to 8 carbon atoms, where a can take a value of 0-3 and from 40 to 100% units of the general formula R _b R ″ _c SiO _{(4-bC / 2),} where R ″ denotes a group - Z _z -R ′, where R ′ is an alkyl group having from 9 up to 35 carbon atoms, Z denotes a linking group between silicon and R ', and z can be 0 or 1, b is 0, 1, 2, c is 1, 2, and b + c is 1, 2, 3 at provided that the carbon content in organopolysiloxane is more than 70 wt. % due to R groups ''; a stabilizing agent having a melting point of from about 40 ° C to 80 ° C, including one or more groups consisting of fatty acid, fatty alcohol and alkylphosphoric acid; finely divided hydrophobic material in an amount of from 0.1 to 15 wt. % (Patent EP 1070526 IPC C11D 3 / 00.1993).

Another patent describes a granular defoamer containing polydimethylsiloxane, with trimethylsiloxy-terminal groups, having a viscosity at 25 ° C from 50 to 100,000 mm ² / s and organic acids and alcohols, with different melting points in the range from 45 ° C to 85 ° C. as well as hydrophobic silica with a particle size of 1-20 μm and a surface area of at least 50 m ² / g (Patent US 5,238,596 IPC C11D 3 / 00.1993).

A disadvantage of the known antifoam is the use of high-melting compounds, which make it difficult to dissolve the antifoam in cold water in the "quick wash" cycle and wash at 40 ° C-90 ° C.

A known composition for controlling foaming, which contains powdered or granular sodium tripolyphosphate, sodium sulfate or sodium perborate, is coated with an organopolysiloxane defoamer, which is partially enclosed in a mixture of water-insoluble wax having a melting point of 55 ° C-100 ° C and water insoluble emulsifier. (Patent GB 1523957 IPC C11D 17/00, 1978).

European patent EP 516109 (IPC B01D 19/04, 1992) describes a silicone antifoam agent containing 20 to 98 parts by weight of trimethylsiloxy terminated dimethylpolysiloxane having a viscosity of 5 to 50,000 cSt at 25 ° C; from 0.1 to 40.0 parts by weight of dimethylpolysiloxane terminated vinyl dimethylsiloxy groups having a viscosity of from 100 to 50,000 cSt at 25 ° C; 0.1-40.0 parts by weight of a dimethylsiloxanemethylhydrogensiloxane copolymer having at least 3 silicon-bonded hydrogen atoms per molecule and with a viscosity of 20 to 10,000 cSt at 25 ° C; 0.1-20.0 parts by weight of trimethylsiloxysilicate having the formula [(CH ₂ ) ₃ SiO _1/2 ] _x ⋅ (SiO ₂ ) y, where x has a value from 1 to 3, and y has a value from 0.5 to 8; from 1.0 to 40.0 parts by weight of silica microparticles; and a catalytic amount of platinum catalyst.

A known composition for the suppression of foaming based on silicone, consisting mainly of polydimethylsiloxane liquid with a viscosity of from 20 to 1500 cSt at 25 ° C; from 5 to 50 parts per 100 parts by weight of a siloxane resin consisting of (CH ₃ ) ₃ SiO _1/2 units, SiO ₂ units with a ratio of (CH ₃ ) ₃ SiO _1/2 units to SiO ₂ units from 0, 6: 1 to 1.2: 1, and from 1 to 20 parts by weight per 100 parts by weight to solid silica gel (Patent RU 2105791 IPC C11D 3/386, C11D 1/10, C11D 1 / 52,1998).

Closest to the proposed composition and adopted by us as a prototype is a composition containing a liquid siloxane component with a viscosity at 25 ° C of 7000 mm / s and a finely divided filler with a hydrophobic surface. The method of preparation of which consists in the interaction of polydiorganosiloxane with terminal trimethylsiloxy groups, polydiorganosiloxane with hydroxy groups and siloxane rubber with tetravalent and monovalent silicon in the presence of potassium silanolate, the subsequent neutralization of the reaction product and its mixing with a hydrophobic finely divided 21C0101D0101 D01 / 00, 1986).

The disadvantages of the known composition include the production of an antifoam in the form of a sticky paste-like substance, its non-uniform combination with detergent powder, caking during storage and deterioration of the antifoam action.

The present invention is the development and creation of an effective composition based on silicone fluid with a long shelf life, with improved defoaming properties for washing powders used in automatic washing machines, from available raw materials produced by the domestic industry.

To solve this problem, an antifoam is proposed, which is a composition consisting of a mixture of linear, branched and cyclic oligodimethylsiloxanes with terminal trimethylsiloxy and hydroxy groups with a kinematic viscosity at 20 ° C from 150 to 400 mm ² / s and a content of hydroxyl groups of 0.24 -0.32% - 14-17% wt., Mixtures of quaternary ammonium salts of high molecular weight fatty compounds - 2-2.5% wt., Methylsilica - 0.5-1.0% wt., Mixtures of sodium methylsiliconate and sodium ethylsiliconate taken in the ratio of 1: 1.5 - 1.5-2.5% of the mass., and sodium carbonate or sodium sulfate - 77-82% of the mass.

The technical result of the claimed invention is to obtain a bulk antifoam composition with improved defoaming properties, increased storage stability, the use of the proposed defoamer reduces the harmful effects on the metal parts of washing machines.

As a result of scientific and experimental studies, a composition of silicone antifoam for washing powders was found, consisting of the following components,% mass:

The PMS-200A liquid is a mixture of a mixture of linear, branched and cyclic oligodimethylsiloxanes containing units of the formula

with terminal trimethylsiloxy groups and hydroxy groups with kinematic viscosity at 20 ° C from 150 to 400 mm ² / s and a hydroxy group content of from 0.24 to 0.32%,

When using PMS-200A liquid with a hydroxy group content of less than 0.24%, an inhomogeneous product is formed; at

the content of hydroxy groups is more than 0.32%, there is a difficult dissolution of the antifoam and deterioration of antifoam properties.

Alkamon OS-2 is a mixture of quaternary ammonium salts of high molecular weight compounds of the fat series of the formula

where n = 16-18.

Methyl silica is a highly dispersed silicon dioxide, for example, grade AM-1/300, hydrophobized with dimethyldichlorosilane, is used as a hydrophobic filler.

Sodium methylsiliconate (GKZh-11 liquid) and sodium ethylsiliconate (GKZh-10 liquid), formulas

where n = 1, 2.

Sulfate (Na ₂ SO ₄ ) or sodium carbonate (Na ₂ CO ₃ ) is a water-soluble inorganic carrier.

During the study, it was unexpectedly found that the most storage-stable product with the best antifoam effect is obtained at a ratio of sodium methyl and ethyl siliconate in a ratio of 1: 1.5.

The antifoam of the present invention is prepared as follows: a mixture of linear and branched oligodimethylsiloxanes with terminal trimethylsiloxy and hydroxy groups (PMS-200A) is mixed with a hydrophobic filler, then a mixture of high-molecular weight fatty acid 2-quaternary ammonium compounds (alkane) is added to the reaction mass to form an emulsion ), then a mixture of sodium methylsiliconate (liquid GKZh-11) and sodium ethylsiliconate (liquid GKZh-10) is added to the emulsion, after which the resulting composition is sprayed onto carbonate on triium or sodium sulfate, dried at a temperature of 80 ° C. An antifoam powder with a particle size of 0.3-0.6 mm is obtained.

Examples of the composition of the obtained compositions are presented in table 1.

To compare the evaluation of the action of the proposed antifoam prepared antifoam prototype: example 2 (sample 7) and 4 (sample 8).

The definition of antifoam is as follows. In 10 g of detergent for hand washing with uncontrolled foaming MIF and TIDE add a weighed amount of silicone antifoam, mix and dissolve the resulting composition in two liters of tap water. A separatory funnel is installed in a cylinder with a capacity of 1000 ml and a diameter of 60 mm, the tube length of which is 165 mm, the end of the funnel tube is set in the cylinder at 900 ml. At a temperature of 25 ° C, 50 ml are poured into the cylinder, and 200 ml of the test solution along the wall in a separatory funnel to avoid foaming. The funnel valve is opened and the solution is drained into the center of the cylinder. After the entire solution, measure the volume of the resulting foam in ml (H ₀ ) with an accuracy of half the division of the cylinder, then after 5 minutes (H ₅ ) measure the volume of the foam and calculate the foam stability Y = H ₅ / H ₀ . For washing powders used in automatic washing machines, foam stability should not exceed 0.3. The results of calculating the stability of the foam are shown in table 2.

From the data given in table 2 shows that in samples 1-6, antifoam properties are better than antifoam prototype.

Claims (1)

A silicone antifoam composition for washing powders containing a liquid siloxane component and a hydrophobic finely divided filler, characterized in that the silicone antifoam composition consists of a mixture of linear, branched and cyclic oligodimethylsiloxanes with terminal trimethylsiloxy and hydroxy groups with a kinematic viscosity of up to 400 mm from 150 ° C from 20 ° C ² / s, and the content of hydroxyl groups 0.24-0.32% - 14-17 wt.%, A mixture of quaternary ammonium salts of high molecular weight fatty compounds - 2-2.5 wt.%, Methylcre mnemasa - 0.5-1.0 wt.%, a mixture of sodium methylsiliconate and sodium ethylsiliconate, taken in a ratio of 1: 1.5 - 1.5-2.5 wt.%, and sodium carbonate or sodium sulfate - 77-82 wt.%.