RU2318782C1 - Heat-insulating coat - Google Patents

Abstract

FIELD: manufacture of heat-insulating materials for surfaces of any form which are also used as sound-insulating, waterproofing, anti-corrosion and sealing materials.

SUBSTANCE: proposed coat is made from composition containing the following components: binder in dry state, hollow micro-spheres and water to required consistency. Binder is selected from group containing the following components: dry copolymer re-dispersible powder or mixture in the amount of up to 95 mass-% with dry re-dispersible water glass in the amount of up to 80 mass-% and/or with cement in the amount of up to 60 mass-%. Used as follow micro-spheres is borosilicate glass at bulk density of 0.05-0.35 g/cm³. Composition may also contain filler in the amount of up to 45 mass-%.

EFFECT: possibility of obtaining ecologically pure composition of protracted term of storage; enhanced heat conductivity of coat.

3 cl, 5 ex

Description

Thermal insulation coating is intended for use in various industries and serves as a coating for surfaces of any shape that require thermal protection. It is applied to external and internal works. Heat-insulating coating can be used as: heat-insulating, sound-insulating, waterproofing, anti-corrosion, cushioning and sealing materials. The patent of the Russian Federation No. 2220988 for a heat-insulating composition is known from the prior art, it contains a rigid polymer, a polymer additive, an acid hardener and glass microspheres. Urea-formaldehyde resin KFZH (M) is used as a rigid polymer, and synthetic latex SKS-65 GP is used as a polymer additive in the following ratio of components, wt. h: resin 215.0, latex 1120.0, glass microspheres 800.0, acid hardener 7.0, water 75.0. Also, the patent of the Russian Federation No. 2251563 for an anticorrosive coating based on hollow microspheres is known from the prior art. The coating is performed from a composition comprising a polymeric binder of 5-95% vol. and hollow microspheres 5-95% vol. The composition is applied in at least one layer and dried. The polymer binder consists of a latex composition. Contains 10-90% vol. (co) a polymer selected from the group: acrylate homopolymer, styrene acrylate copolymer, styrene butadiene copolymer, polystyrene, butadiene polymer, polyvinyl chloride polymer, polyurethane polymer, vinyl acetate polymer or copolymer, or mixtures thereof. The binder also contains 10-90% vol. mixtures of water and surfactant. Hollow microspheres have a size of 10-500 microns and a bulk density of 50-650 kg / m ³ . Selected from the group: glass, ceramic, polymer, ash or mixtures thereof.

Both of the above products as a main filler contain a certain amount of glass hollow microspheres and have good thermal insulation properties with satisfactory adhesion to various substrates, but have different polymer binders. The first and second composition in the composition of the polymer has water, which is directly related to the synthesis conditions for obtaining these binders. Other well-known products in the composition of the polymer binder contain volatile solvents, which increases their fire hazard and limits the scope. The main disadvantages of these products are:

- short shelf life,

- restrictions in storage conditions,

- an increase in the cost of transporting the product (water must be transported),

- transportation and storage implies only a positive ambient temperature, with the introduction of antifreezes, the quality of the product decreases or the cost of the product increases,

The objective of this invention is the elimination of these shortcomings and the creation of a coating composition that would provide fire and explosion safety, is an environmentally friendly product, would provide savings in transportation and storage (due to lack of water), would have a long shelf life, not be afraid of freezing. This problem is achieved due to the fact that the composition can be delivered to the consumer in a dry form and is "activated" by adding the necessary amount of water for dilution to a paint viscosity. It can be applied with a spatula, brush, bulk, roller or spray gun.

A heat-insulating coating is a composition comprising a binder, hollow microspheres and water to the desired consistency, characterized in that the composition contains a binder in a dry form selected from the group comprising a dry copolymer redispersible powder or a mixture thereof in an amount of up to 95% wt. with dry redispersible liquid glass in an amount of up to 80% wt. and / or with cement in an amount up to 60% wt., dry redispersible liquid glass or a mixture thereof in an amount up to 80% wt. with cement in an amount up to 60% wt., as hollow microspheres contains borosilicate glass with a bulk density of 0.05-0.35 g / m ³ and, if necessary, a filler in an amount up to 45% wt.

The composition may further comprise additives selected from the group comprising 0.2-1.5% wt. defoamer, 0.2-1.5% wt. wetting agent, 0.2-1.5% wt. dispersant, 0.5-1.5% wt. thickening water-retaining additives, 1-7% wt. flame retardant, and, if necessary, up to 10% wt. lime hydrate, up to 1.5% wt. setting accelerator, up to 2.5% wt. water repellent, up to 1.5% wt. redispersible benton, up to 8% wt. reinforcing additives.

The composition may additionally contain inorganic pigment in an amount of up to 30% wt.

Hollow microspheres are mainly obtained by introducing a blowing agent into the base material, then grinding them and heating them to foam the blowing agent.

So, for example, hollow microspheres can be obtained by passing small particles containing porophore through a high-temperature zone; the particles melt or soften in the hot zone, and the blowing agent forms a cavity inside the particles, expanding them. When a sphere is cooled in air, its walls harden. Or they are obtained by foaming glass particles in a burner flame, etc. As hollow glass microspheres, for example, microspheres of the Glase babez type, such as Microballon, globumite, spherulite, are used.

The composition of the thermal insulation coating consists of:

- from binding components: redispersible dry powder (for example, Acronal 430 or Wacker-Chemie GmbH Vinnapas RI554Z or RI551Z products, or any acrylic copolymer) from 0 to 95%, cement (for example, white) from 0 to 60%, redispersible water glass (e.g. potassium) from 0 to 80%,

- from additives: lime hydrate from 0 to 10%, antifoam (e.g., Agitan 801) from 0.2 to 2.5%, wetting agent (e.g. Metolat 530) from 0.2 to 1.5%, dispersant (e.g. Metolate 588) from 0.2 to 1.5%, setting accelerator (e.g. calcium formate) from 0 to 1.5%, water repellent (e.g. Bermacol 425) from 0 to 2.5%, thickening water-holding additives (e.g. Ligafob) from 0.5 to 1.5%, redispersible benton from 0 to 2%, reinforcing additives (e.g. Teknocel) from 0 to 8%, antiperen (e.g. sodium polyphosphate) from 1 to 7%,

- from a filler (e.g. kaolin, talc, omiakarb) from 0 to 45%,

- inorganic pigment (for example, titanium dioxide) from 0 to 30%,

- hollow finished (or not) microspheres of borosilicate glass with a bulk density of 0.05-0.35 g / m ³ .

The specified composition can be used in any of the specified proportional proportions of the total weight of the composition, taken equal to 100%. As a binder, materials can be used in any of the combinations:

- polymer redispersible powder, cement, redispersible liquid glass,

- polymer redispersible powder,

- polymer redispersible powder, redispersible liquid glass,

- redispersible liquid glass,

- redispersible liquid glass, cement.

The use of cement in its pure form as a binder is limited due to poor adhesion to the microspheres. Additives in the composition are used to impart certain properties: defoaming, improve spreading on the substrate, improve the dispersibility of fillers and their wetting, impart non-combustibility properties, reinforcement (hardening of the coating), improve rheological properties, accelerate setting, hydrophobicity (improve water resistance).

The composition can be used both with various additives and without additives. Additives are not mandatory components in a dry composition, as they perform special functions depending on the requirements for this material: rheological, waterproofing, fireproofing, reinforcing, and so on.

The composition of the composition contains, as an obligatory part, a certain amount of hollow glass microspheres, which after polymerization form a strong elastic membrane. Due to the presence of microspheres, which inside contain rarefied gas and have an ideal spherical shape, an energy-saving effect is formed, based on the dispersion of the heat flux. Microspheres “filter” the heat flux in the IR spectrum, reflecting and dissipating up to 25% of the heat. The heat loss of structures protected by this product is reduced, and the cost of heating the building is reduced by 20-30%.

The heat flux is based on moisture-dependent thermal conductivity and the enthalpy steam flux. It transfers heat, and moisture evaporates in one place, extracting heat from there, and diffuses to another place, condenses there and releases heat. This type of heat transport is often called the “latent heat effect”.

Pigments are used in the composition mainly to impart color and anticorrosion properties. The composition can be used with or without various pigments.

Fillers can serve not only as a system filler and a way to reduce the cost of a product, but also as a reinforcing additive, for example, wollastonite, basalt fiber, etc. The composition can be used with or without various excipients.

Mixing of the dry product should take place at positive temperature. The finished composition of the dry composition can be stored as long as desired at any temperature known in nature - on average from -60 ° C to + 60 ° C.

The overall composition does not contain toxic impurities and is an environmentally friendly product.

The dissolved product must not be exposed to freezing temperatures.

Dissolution of the product can be carried out using a drill with a nozzle, at a speed of not more than 300 rpm. The stirring elements of the stirring device must not come into contact with the walls of the vessel in which the product is mixed.

Thermal insulation coating is intended for application to surfaces of any shape that require thermal protection. It is applied to external and internal works.

Product activation, to the working state, occurs by introducing water into the mixture and thoroughly mixing the mixture with an exposure of 10 minutes to the required consistency.

The consistency of the product depends on the type of tool with which it is applied to the surface of the processed material. The addition of water is usually 100% by weight of dry material with an accuracy of 25%.

As cement, for example, cement of the grade ПЦ500 DO (Oskolcement) can be used, having the following phase composition (wt%): 2СаО · SiO ₂ - 52-55, 2СаО · SiO ₂ - 20-22, 3СаО · Al ₂ O ₃ - 20-22, gypsum - 5.

As a dry redispersible polymer, for example, Akronal-430 grade manufactured by BASF can be used.

In prescription compositions where dry liquid glass (hydrated sodium or potassium silicate) is used, for example, glass produced by the Volkhov Chemical Plant under the brand name Monasil can be used.

In the formulation compositions, various brands of hollow glass microspheres can be used, for example, microspheres manufactured by Zelenogradsky JSC "Fiberglass".

Example 1

The composition was selected as part of:

Cement - 42.1%

Polymeric redispersible powder - 8%

Antifoam - 1%

Wetting agent - 1%

Titanium Dioxide (pigment) - 12%

Talc (filler) - 1.5%

Methyl cellulose (thickener - anti-sedimentation ext.) - 0.4%

Calcium Formate (setting accelerator) - 0.5%

Water repellent - 3%

Antiperen (ammonium polyphosphate) - 2.5%

Hollow finished (or not) microspheres made of borosilicate glass with a bulk density of 0.05-0.35 g / m ³ - 28%

The composition was diluted with water to a paint viscosity. The amount of water is selected within 100% ± 20% of the total weight of the composition, depending on how the coating will be applied - with a spatula or spray.

This composition has the following technical characteristics (according to TU 2216-003-5654-2859-06, registered under the brand name "Thermo-Stop NT", made according to this recipe):

Bulk weight - 0.45 g / cm3

Strength to chalking - absent

Coefficient of thermal conductivity of the coating - 0.06 W / m deg.

Adhesion Strength - 0.06 MPa

Frost resistance - not less than 30 cycles

Water resistance - 72 hours without destruction

The composition in this composition was exposed to cold at a temperature of -60 ° C, then exposed to thermal radiation at a temperature of + 60 ° C. After that, it was used as intended by mixing with water at room temperature. The resulting consistency was applied as a coating to one of two identical cubes from a wooden lining with a volume of 1 m ³ . Highly sensitive electronic thermometers and humidity sensors were previously placed in cubes without contact with the surface.

Comparative tests for exposure to water, fire, heat and cold showed that a cube coated with the above composition was not subject to fire and water penetration, and the penetrating effect of heat and cold is reduced by 30% and 40%, respectively. Additionally, the coating was applied to one of two identical iron plates. Then both plates were placed in a salt spray chamber with aerosol formation at a NaCl concentration of 2% for 24 hours, after which both plates were removed from the chamber and the coating was scraped off from the coated plate. Comparative corrosion tests showed that the coated plate was not exposed to corrosion at all. In contrast, the uncoated plate was coated with a touch of rust.

Additionally, a coating of 2 mm was applied to one of two identical iron pipes with a diameter of 57 mm. Then both pipes were exposed to heat. Comparative tests showed that a pipe with a coating layer of 2 mm was approximately 29% more resistant to heat compared with an uncoated pipe, since its temperature was 45 ° C lower than the temperature of the uncoated pipe, which at the time of measurement was + 154 ° C.

Other examples of the invention, illustrating the receipt of a thermal insulation coating made from a composition presented in the form of the following alternative options are shown below.

Example 2

The composition was selected as follows:

Redispersible polymer powder - 14%

Cement - 20%

Hollow microspheres - 33%

Pigment (titanium dioxide) - 19%

Kaolin - 14%

The composition was diluted with water to a paint viscosity. The amount of water is selected within 100% ± 20% of the total weight of the composition, depending on how the coating will be applied - with a spatula or spray.

The composition in this composition was exposed to cold at a temperature of -60 ° C, then exposed to thermal radiation at a temperature of + 60 ° C. After that, it was used as intended by mixing with water at room temperature.

The resulting consistency was applied as a coating to one of two identical cubes from a wooden lining with a volume of 1 m ³ . Highly sensitive electronic thermometers and humidity sensors were previously placed in cubes without contact with the surface.

Comparative tests for exposure to water, fire, heat and cold showed that a cube coated with the above composition was not subject to fire and water penetration, and the penetrating effect of heat and cold is reduced by 24% and 35%, respectively.

Additionally, the coating was applied to one of two identical iron plates.

Then both plates were placed in a salt spray chamber with aerosol formation at a NaCl concentration of 2% for 24 hours, after which both plates were removed from the chamber and the coating was scraped off from the coated plate. Comparative corrosion tests showed that the coated plate was not exposed to corrosion at all. In contrast, the uncoated plate was coated with a touch of rust.

Additionally, a coating of 2 mm was applied to one of two identical iron pipes with a diameter of 57 mm. Then both pipes were exposed to heat. Comparative tests showed that a pipe with a coating layer of 2 mm was approximately 23% more resistant to heat compared with an uncoated pipe, since its temperature was 45 ° C lower than the temperature of the uncoated pipe, which at the time of measurement was + 154 ° C.

Example 3

The composition was selected as follows:

Redispersible polymer powder - 16%

Redispersible liquid potassium glass - 19%

Quartz sand - 21%

Hollow microspheres - 25%

Pigment (titanium dioxide) - 19%

The composition was diluted with water to a paint viscosity. The amount of water is selected within 100% ± 20% of the total weight of the composition, depending on how the coating will be applied - with a spatula or spray.

The composition in this composition was exposed to cold at a temperature of -60 ° C, then exposed to thermal radiation at a temperature of + 60 ° C. After that, it was used as intended by mixing with water at room temperature.

The resulting consistency was applied as a coating to one of two identical cubes from a wooden lining with a volume of 1 m ³ . Highly sensitive electronic thermometers and humidity sensors were previously placed in cubes without contact with the surface.

Comparative tests for exposure to water, fire, heat and cold showed that a cube coated with the above composition was not subject to fire and water penetration, and the penetrating effect of heat and cold is reduced by 26% and 38%, respectively, when coating.

Additionally, the coating was applied to one of two identical iron plates.

Then both plates were placed in a salt spray chamber with aerosol formation at a NaCl concentration of 2% for 24 hours, after which both plates were removed from the chamber and the coating was scraped off from the coated plate. Comparative corrosion tests showed that the coated plate was not exposed to corrosion at all. In contrast, the uncoated plate was coated with a touch of rust.

Additionally, a coating of 2 mm was applied to one of two identical iron pipes with a diameter of 57 mm. Then both pipes were exposed to heat. Comparative tests showed that a pipe with a coating layer of 2 mm was approximately 25% more resistant to heat compared with an uncoated pipe, since its temperature was 45 ° C lower than the temperature of the uncoated pipe, which at the time of measurement was + 154 ° C.

Example 4

The composition was selected as follows:

Cement - 34%

Redispersible liquid sodium glass - 7%

Kaolin - 20%

Hollow microspheres - 27%

Pigment (titanium dioxide) - 12%

The composition was diluted with water to a paint viscosity. The amount of water is selected within 100% ± 20% of the total weight of the composition, depending on how the coating will be applied - with a spatula or spray.

The composition in this composition was exposed to cold at a temperature of -60 ° C, then exposed to thermal radiation at a temperature of + 60 ° C. After that, it was used as intended by mixing with water at room temperature.

The resulting consistency was applied as a coating to one of two identical cubes from a wooden lining with a volume of 1 m ³ . Highly sensitive electronic thermometers and humidity sensors were previously placed in cubes without contact with the surface.

Comparative tests for exposure to water, fire, heat and cold showed that a cube coated with the above composition was not subject to fire and water penetration, and the penetrating effect of heat and cold is reduced by 22% and 34%, respectively.

Additionally, the coating was applied to one of two identical iron plates.

Then both plates were placed in a salt spray chamber with aerosol formation at a NaCl concentration of 2% for 24 hours, after which both plates were removed from the chamber and the coating was scraped off from the coated plate. Comparative corrosion tests showed that the coated plate was not exposed to corrosion at all. In contrast, the uncoated plate was coated with a touch of rust.

Additionally, a coating of 2 mm was applied to one of two identical iron pipes with a diameter of 57 mm. Then both pipes were exposed to heat. Comparative tests showed that a pipe with a coating layer of 2 mm was approximately 22% more resistant to heat compared with an uncoated pipe, since its temperature was 45 ° C lower than the temperature of the uncoated pipe, which at the time of measurement was + 154 ° C.

Example 5

The composition was selected as follows:

Redispersible liquid potassium glass - 35%

Quartz sand - 34%

Hollow microspheres - 24%

Pigment (titanium dioxide) - 7%

The composition was diluted with water to a paint viscosity. The amount of water is selected within 100% ± 20% of the total weight of the composition, depending on how the coating will be applied - with a spatula or spray.

The composition in this composition was exposed to cold at a temperature of -60 ° C, then exposed to thermal radiation at a temperature of + 60 ° C. After that, it was used as intended by mixing with water at room temperature. The resulting consistency was applied as a coating to one of two identical cubes from a wooden lining with a volume of 1 m ³ . Highly sensitive electronic thermometers and humidity sensors were previously placed in cubes without contact with the surface.

Comparative tests for exposure to water, fire, heat and cold showed that a cube coated with the above composition was not subject to fire and water penetration, and the penetrating effect of heat and cold is reduced by 25% and 38%, respectively. Additionally, the coating was applied to one of two identical iron plates. Then both plates were placed in a salt spray chamber with aerosol formation at a NaCl concentration of 2% for 24 hours, after which both plates were removed from the chamber and the coating was scraped off from the coated plate. Comparative corrosion tests showed that the coated plate was not exposed to corrosion at all. In contrast, the uncoated plate was coated with a touch of rust.

Additionally, a coating of 2 mm was applied to one of two identical iron pipes with a diameter of 57 mm. Then both pipes were exposed to heat. Comparative tests showed that a pipe with a coating layer of 2 mm was approximately 27% more resistant to heat compared with an uncoated pipe, since its temperature was 45 ° C lower than the temperature of the uncoated pipe, which at the time of measurement was + 154 ° C.

Claims (3)

1. A heat-insulating coating made from a composition comprising a binder, hollow microspheres and water to the desired consistency, characterized in that the composition contains a binder in dry form selected from the group comprising a dry copolymer redispersible powder or a mixture thereof in an amount of up to 95 wt.% with dry redispersible liquid glass in an amount of up to 80 wt.% and / or with cement in an amount of up to 60 wt.%, dry redispersible liquid glass or a mixture thereof in an amount of up to 80 wt.% with cement in an amount of up to 60 wt.%, in as hollow micros the fer contains borosilicate glass with a bulk density of 0.05-0.35 g / m ³ and, if necessary, a filler in an amount of up to 45 wt.%. 2. The thermal insulation coating according to claim 1, characterized in that the composition further comprises additives selected from the group comprising 0.2-1.5 wt.% Defoamer, 0.2-1.5 wt.% Wetting agent, 0.2 -1.5 wt.% Dispersant, 0.5-1.5 wt.% Thickening water-retaining additives, 1-7 wt.% Flame retardant, and, if necessary, up to 10 wt.% Lime hydrate, up to 1.5 wt. % setting accelerator, up to 2.5 wt.% water repellent, up to 1.5 wt.% redispersible benton, up to 8 wt.% reinforcing additives. 3. Thermal insulation coating according to claim 1 or 2, characterized in that the composition further comprises an inorganic pigment in an amount up to 30 wt.%.