SI23509A - Synthesis of nano cleanser on the basis of amorphous nano silicon (iv) oxide - Google Patents

Abstract

The submitted invention refers to a synthesis of nano cleanser based onamorphous nano silicon (IV) oxide with a narrow sphere shaped particle size distribution within the range between 5 nm and 50 nm, to a precipitationprocess of commercially available aqueous sodium silicate solution with hydrochloric acid in aqueous solution of sodium silicate at a pH value between 6.5 and 11, the synthesis temperature area between 50 degrees C and 90 degrees C and dwell time at a maximum temperature of 20 to 150 minutes, to a stabilizing suspension by the addition of hydrochloric acid at a pH value between 3 and 5, drying of amorphous nano silicon (IV) oxide dispersions in the temperature range between 110 degrees C and 120 degrees C and dwell time at a maximum temperature of 12 to 24 hours, to a process of incorporation of the surface stabilized amorphous silicon (IV) oxide nano particles in the concentration area between 1% w/w and 10% w/w in aqueous suspensions of polyglycol ether fatty alcohol in the concentration area between 3% w/w and 8 % w/w, sodium alkyl salt tenside in the concentration area between 4% w/w and 10% w/w, citric acid in the concentration area between 1% w/w and 5% w/w, aluminum (III) oxide in the concentration area between 12% w/w and 20% w/w, the preservative in the concentration area between 0.01% w/w and 0.3% w/w and aetheric oil in the concentration area between 0.1% w/w and 3% w/w, which enables a thin layer cleanser coating onto the surface of objects which are to be cleaned effective cleaning and less consumption of cleanser and improvements of final mechanical and self-cleaning properties of objects.

Description

Synthesis of nano-based cleaner based on amorphous nano-silicon (IV) oxide

The subject of the invention is the synthesis of nano purifier based on amorphous nano silicon (IV) oxide, with a narrow particle size distribution of spherical shape in the range between 10 nm and 50 nm, the concentration of amorphous nano silicon (IV) oxide particles in aqueous dispersion systems in a concentration range between 1 wt% and 10 wt%, which allows a thin layer of cleaner to be applied to the surface of cleaned objects, efficient cleaning and reduced consumption of cleaning agent, and improvement of the final mechanical and self-cleaning properties of the objects.

Properties of amorphous nano silica (SiO ₂ ) based nano cleaners are basically determined by particle size and shape, specific surface area and concentration of amorphous nano silicon (IV) oxide in aqueous dispersion systems adapted to the conditions of use in various fields of chemical industry, household techniques and in the field of ecology and environmental protection.

Efficient utilization of the basic properties of nano-based silicon nano-silicon (IV) oxide cleaner is possible due to the customized choice of carrier bonding systems, the size, shape and concentration of nano-particles of amorphous silicon (IV) oxide and the conditions of incorporation of surface-stabilized nano-particles of amorphous nano-silicon (IV) of oxide into various stable aqueous dispersion systems.

According to the standard patent classification, the invention belongs to the 1st class - chemical products for industry and science.

A technical problem to be solved by the invention is the synthesis of an amorphous nano-silica (IV) oxide nano-cleaner, which involves the process of precipitation of a commercially available aqueous sodium silicate solution with a density in the range o

between 1.20 g / cm and 1.54 g / cm with hydrochloric acid having a concentration in the range of 30% to 32% in aqueous sodium silicate at a pH between 6.5 and 11, in a temperature range between 50 ° C and 90 ° C and a holding time at a maximum temperature of 20 to 150 minutes, stabilization of the suspension with the addition of hydrochloric acid at a pH between 3 and 5, drying of dispersion of amorphous nano silicon (IV) oxide in the temperature range between 110 ° C and 120 ° C and a residence time at a maximum temperature of 12 to 24 hours, the process of incorporating surface-stabilized nano-particles of amorphous silica (IV) oxide in a concentration range between lut% and 10ut%, into aqueous suspensions of fatty alcohol polyglycol ether in a concentration range between 3ut% and 8ut% , alkyl salts of the alkyl sulfonate in the concentration range between 4ut% and 10ut%, citric acid in the concentration range between lut% and 5ut%, aluminum (III) oxide in the concentration range between 12 wt% and 20 wt%, essential oil in a concentration range between 0.1 wt% and 3 wt% and a preservative in a concentration range of 0.01 wt% to 0.3 wt%, adapted to the conditions of use in various fields of chemical industry, household technology and in the field ecology and environmental protection.

According to the available literature, inorganic fillers based on CaCO ₃ Na ₂ CO ₃ and NaOH in the concentration range between 20ut and 85ut% are currently predominantly used in commercial cleaners. Inorganic filler particles ranging in size between lpm and 20 pm by various technologies are incorporated into aqueous dispersants based on polyacrylic acid, sodium polyacrylate, sodium phosphate and various non-ionic surfactants. With existing cleaners, due to the shape and size of the particles and the high concentration of inorganic filler in the aqueous dispersion systems, the agglomeration of the particles, separation of the solid and liquid phases, affecting the cleaning effect, the amount of cleaning agent used and the surface resistance of the objects.

Compared to the known commercial cleaner preparation methods, the object of the invention differs from them in the addition of surface-stabilized amorphous silica (IV) oxide nanoparticles with particle sizes in the range of 5 nm to 50 nm, which stably embedded in aqueous dispersion systems allow the application of an extremely thin layer of the cleaning agent on the surface of the cleaned objects, improve the cleaning efficiency with less use of the cleaning agent and influence the improvement of the final mechanical and self-cleaning properties of the objects.

The invention relates to the raw materials used, chemical composition, synthesis, stabilization of the surface of amorphous silica (IV) nanoparticles with the addition of organic surfactants, and the process of incorporation of surface-stabilized nano-particles of amorphous silicon (IV) oxide into aqueous solutions of dispersion agents in the manufacture of nano cleaners with appropriate physicochemical properties.

According to the invention, the problem is solved by the synthesis and surface stabilization of amorphous nano-silicon (IV) oxide and the process of incorporating surface-stabilized nano-particles of amorphous silicon (IV) oxide into aqueous dispersion systems using:

Aqueous solutions of commercially available sodium silicate with a density in the n -3 range between 1.20 g / cm and 1.54 g / cm and the reaction module S1O2 /

At ₂ O in the range of 2 to 3

Hydrochloric acids of technical purity in the concentration range between 30% and 32%

Addition of polyglycol ether fatty alcohol in the concentration range between 3% and 8%

Addition of alkyl sulfonate in a concentration range between 4ut% and 10ut%,

X Addition of citric acid in the concentration range between lut% and 5ut%

X Addition of aluminum (III) oxide in a concentration range between 12% and 20%

Addition of essential oil in the concentration range between 0,1% and 3% by weight

Addition of amorphous nano silicon (IV) oxide in the concentration range between lut% and 10ut%

Preservative additive in the concentration range between 0,01 wt% and 0,3 wt%

Process parameters for precipitation of a commercially available aqueous sodium silicate solution with a density in the range of 1.20 g / cm to 1.54 g / cm with hydrochloric acid with a concentration in the range of 30% to 32% in aqueous sodium silicate at a pH of between 6 , 5 and 11, in the temperature range between 50 ° C and 90 ° C and a holding time at a maximum temperature of 20 to 150 minutes, stabilization of the suspension with the addition of hydrochloric acid at a pH value in the range of 3 to 5, drying process of the dispersion of amorphous nano silicon (IV) oxide in the temperature range between 110 ° C and 120 ° C and a residence time of • · maximum temperature of 12 to 24 hours, installation process of citric acid, aluminum (III) oxide, essential oil, amorphous nano silicon (IV) oxide and a preservative to an aqueous suspension of fatty alcohol of polyglycol ether and surfactant sodium salt of alkylsulfonate (both previously stabilized for 24 hours at a temperature between 20 ° C and 30 ° C) in a temperature range of between 25 ° C and 30 ° C and a homogenization time of 60 minutes.

The exact proportions of the individual components and the corresponding process parameters of the synthesis are given in the embodiments.

EXECUTIVE EXAMPLE

Add 1140 ml of water to a reaction vessel equipped with a stirrer and electrodes for measuring pH and temperature and heat it to 60 ° C. During stirring, the heated water is basified with an aqueous solution of commercially available sodium o

of silicate with a density of 1.54 g / cm to pH = 7. The automatic dosing vessel is filled with hydrochloric acid of technical purity and concentration of 31%, the manual dosing vessel is properly mounted on the reaction vessel and filled with 320 ml of sodium silicate aqueous solution with a density of 1,345 g / cm ³ and the reaction module SiO ₂ / Na ₂ O 2,6 . Hydrochloric acid and aqueous sodium silicate solution, while stirring with a 200 rpm agitator, were added simultaneously to the alkaline water for 30 minutes and maintained at 60 ° C at pH = 7. After the addition of the excess sodium silicate aqueous solution is complete, the reaction mixture is basified to pH = 8.5 and precipitated for 30 minutes at 200 rpm while stirring with an angular mixer. After complete precipitation with excess hydrochloric acid of technical purity and concentration of 31%, acid the suspension to pH = 3.5 and cool to room temperature. Dry at 110 ° C for 20 hours at maximum temperature. Add to the vessel equipped with an anhydrous agitator a mixture of 66% water, and with stirring at a rate of 150 rpm, add 5.3% by weight of the polyglycol ether fatty alcohol and 6.4% by weight of alkylsulfonate sodium salt, previously stabilized for 24 hours at 25 ° C. After stirring for 15 minutes, 3.3 wt% citric acid and 16.8 wt% aluminum (III) oxide were added to the aqueous mixture of both surfactants. The suspension thus prepared is homogenized for 30 minutes. After homogenization, 0.2 wt% essential oil, 0.01 wt% preservative and 2 wt% amorphous nano silicon (IV) oxide were added and stirred for 60 minutes at 25 ° C.

According to the invention, the problem is solved by the synthesis of nano-particles of amorphous silicon (IV) _Λ 2 spherical oxide, size 30 ± 5 nm and a specific surface area of 130 ± 5 m / g, and the process of incorporation of nano-particles of amorphous silicon (IV) oxide into aqueous dispersion systems .

Claims (1)

PATENT APPLICATION Synthesis of an amorphous nano-silicon (IV) oxide nano-based cleaner, characterized in that it involves the process of precipitation of an aqueous solution of sodium silicate with a density in the range of 1.20 g / cm to 1.54 g / cm and the SiO2 / Na reaction module ₂ O in the range of 2 to 3, with hydrochloric acid having a concentration in the range of 30% to 32% in aqueous sodium silicate solution at pH between 6,5 and 11, in the temperature range between 50 ° C and 90 ° C and the holding temperature time at maximum temperature in the range of 20 to 150 minutes, stabilization of the suspension with the addition of hydrochloric acid at a pH between 3 and 5, drying of dispersion of amorphous nano silicon (IV) oxide in the temperature range between 110 ° C and 120 ° C and holding between 12 and 24 hours at maximum temperature, which ensures the synthesis of amorphous nano-silicon (IV) oxide spherically shaped, with a particle size of 30 ± 5 nm and a specific particle area of 130 ± 5 m / g, of the nano-particles of amorphous silica (IV) oxide in the concentration range between lut% and 10ut% to an aqueous suspension of polyglycol ether fatty alcohol in the concentration range of 3ut% to 8ut%, of the alkyl salts of the alkyl sulfonate in the concentration range between 4ut% and 10ut%, citron acids in the concentration range between lut% and 5ut%, aluminum (III) oxide in the concentration range between 12ut% and 20ut%, the preservative in the concentration range 0,01 wt% and 0,3 wt% and the essential oil in the concentration range between 0, 1 wt% and 3 wt%.