RU2245350C1 - Heat protective dye - Google Patents

Abstract

FIELD: chemical industry, paint-vehicle systems, in particular heat protective dyes.

SUBSTANCE: claimed dye contains ceramic and corundum microspheres; resins, selected from group including silicone resin, polyesterepoxy resin, acrylic resin dispersions as binder; pigment; and aluminum powder as deflector. Such composition provides reduced heat loss into environment. Obtained dyes have thermal gradient, improved heat-retention properties and strength, and useful in corrosion and heat-loss protection of building construction, transport, gas and oil lines, heating systems, etc.

EFFECT: easier method for dye production; strength and homogenous heat protective dye layer of improved adhesiveness.

2 cl, 3 tbl

Description

The invention relates to the chemical industry, in particular to thermal protective paints, which reduce heat loss to the environment by buildings, utilities or piping systems having a temperature gradient, performing the functions of high-performance thermal insulation, having high strength characteristics that allow them to be used in the production of building buildings and structures , for protection against corrosion and heat loss of gas pipelines, oil pipelines, centralized and local systems eplosnabzheneniya, mobile transport as road, rail, river and sea transport.

The use of heat-protective paints (TZK) as primers before applying fire-retardant paints can be used to increase the fire resistance of buildings and structures by 20-30%. TZK can be used as thermal insulation, which has protective properties against stray currents under water (application in sewer systems and areas of permafrost zones). Translucent refueling complexes are suitable as energy-saving, moisture-proof and finishing materials for the creation or restoration of residential and industrial buildings, preventing radiant and convective heat exchanges between the surface of the coated material and the environment.

Well-known analogues, such as acrylic water-dispersion paint coatings with evacuated ceramic microspheres for the Thermo-Shield, Thermo-Shield Exterior, Thermo-Shield Interior thermo-ceramic coatings, are recommended as heat-insulating material for the external and internal surfaces of the enclosing constructions of buildings and structures. All these compositions are characterized by the fact that the density of the microspheres in the dry state is 1000-1100 kg / cubic meter, due to the low strength of the microspheres, a special application technology (gun) is used (see http: //www.thermo-shield.sky. ru / komp.htm, 07.22.2003).

Known heat-insulating coatings based on the use of inorganic binders with mineral fillers and additives: fibrous material, asbestos, vermiculite, perlite, etc.

The coatings obtained on this basis have high reflectivity and low thermal conductivity. All of these heat-saving coatings or insulation materials based on them are ineffective for economic and technological reasons (US Pat. No. 4433020, 1984).

The closest similar thermal protective paint is a paint containing evacuated microspheres, a binder, a pigment - titanium dioxide and additives (see EP No. 1111144 A1, E 04 B 1/76, 2001).

The aim of the invention is: the creation of an effective energy-saving technology based on the use of refueling complexes to reduce heat loss to the environment from heat sources, buildings, structures, utilities.

SUMMARY OF THE INVENTION

Heat-protective paint contains evacuated microspheres, a binder, a pigment and an additive, characterized in that as evacuated microspheres it contains ceramic or corundum microspheres with a density of 300-400 kg / m ³ with the following mass distribution of microspheres in size, in wt.%:

base diameter - 30-60 microns 45-55

diameter - 3-10 microns 15-17

diameter - 11-20 microns 8-10

diameter - 21-30 microns 6-8

diameter - 61-70 microns 9-11

diameter - 71-80 microns 4-6

diameter - 91-100 microns 2-4,

as a binder contains resins selected from the group including: organosilicon, polyether epoxy, acrylic dispersions, as an additive - reflector - aluminum powder in the following ratio of ingredients, in wt.%:

the above evacuated microspheres - 55-70;

pigment - 0.1-0.6;

reflector - aluminum powder - 2.0-5.0;

the above binder is 30-35.

The pigment used is titanium dioxide or aluminum trihydrate.

A solution of 30% bitumen in white spirit and xylene 30% of the total solvent mass were used as a solvent for polyether epoxies.

The technical result achieved by the invention is to increase the thermal insulation, thermal properties of insulation materials based on products of paint and varnish production using ceramic microspheres, chemicals and fillers, to increase the adhesion strength to the surface to be protected, to obtain a durable and uniform thermal insulation layer, as well as to ensure non-destruction it under the influence of high temperatures (up to 250 ° C), vibration loads, in simplifying the technology of copulating refueling and accessibility for mass application, e.g., a spray with a conventional tool (pistol).

The production of TZK is based on the preparation of the dry part of the component, comprising 65-70% of the total bulk mass and the remaining 30-35% form binders manufactured by the industry, for example, epoxy and polyester epoxy resins, water-dispersed acrylic, polyvinyl acetate copolymers, such as acrylic or acrylatex dispersions.

To expand the range of physical properties of TZK, aluminum powder is introduced into the chemical composition of the dry component, and to increase water resistance, a solution of bitumen in white spirit and xylene 30% of the total solvent mass are added.

The chemical composition, the method of preparation and application of a thermal protective coating to the surface plays an important role in the quality indicators of TZK, such as the layer height, the diameter of ceramic or corundum microspheres, their uniform distribution over the entire volume of formation of a homogeneous suspension, which largely determines the strength and elasticity of the resulting thermal protective work surface coatings.

Depending on the binder, TZK is applicable for various places - indoors (environmentally friendly on acrylic dispersions), chemically and waterproof (polyetherepoxy and organosilicon varnishes). The choice of a binder in the composition of TZK is determined by the appropriateness of use, price, and also the requirements for the thermophysical properties of the painted surface of this type of materials or structures (see table No. 1, table No. 2).

The invention can be used to protect metal, concrete, brick, plastered, wooden, polymer, cable structures, where there is a need for thermal and waterproofing.

The invention provides for the production of paints with high thermophysical characteristics, with a fairly simple technology from available materials of domestic production.

The proposed paint TZK is characterized by the fact that the microspheres have a density of 300-400 kg / m ³ and their strength allows the use of conventional painting techniques, in addition, a choice for a binder is proposed for this dry component of a set of evacuated microspheres, depending on the application and purpose (see table No. 1). As the base size, comprising 45-55% of the composition of the microspheres, microspheres with a diameter of 30-60 microns, a diameter of 3-10 microns - 16%, 11-20 microns - 9%, 21-30 microns - 7%, 61- 70 microns - 10%, 71-80 microns - 5%, 91-100 microns - 3%. The heat-reflecting effect is achieved due to the low thermal conductivity and due to the high reflectivity of the microspheres used. In other words, we can arbitrarily consider the heat flux from the heated surface, the passing layer of the SCC, both by radiation and thermal conductivity, obeying the probabilistic laws of chaos theory, itself, reflected in spherical microspheres, stop in the direction of the temperature gradient. Within the framework of the achieved technology for producing microspheres, it is possible to create TZK paints with predetermined properties according to the strength of the thickness of the paint coating, depending on the purpose of the surface to be treated. The microsphere wall thickness varies from 2-3 microns. White spirit, xylene, butyl acetate or water are used as solvents for the manufacture of TZK, depending on the binder (see table 3). TZK is applied in various ways on a metal, ceramic (brick) or wooden surface with a spatula, brush or spray gun.

TZK is a homogeneous suspension with the inclusion of microceramic or corundum evacuated microspheres, which have low thermal conductivity compared to known heat-insulating materials and have small geometrical dimensions along the thickness of the insulating layer, because the diameter of the microspheres used in the manufacture of paint is 3.0-100 microns, including chemical additives, fillers, pigment, is made on the basis of binders - varnishes: colorful, parquet (polyetherepoxy and organosilicon resins, acrylic-water dispersions). When applied to the surface of a metal, wood or other products, paint layers form, upon drying, opaque or translucent coatings that protect the surface of the metal or wood from aggressive agents, giving it a marketable appearance and holding a temperature drop with a gradient of up to 250 ° C with a paint-insulation layer thickness up to 1-5 mm, which is equivalent to a layer of 100-150 mm of known thermal insulation materials (for example, fiberglass). When applied to the surface of a material or product, paint (TZK) forms a protective heat-insulating layer of ceramic or corundum microspheres of different diameters, forming a dense package in a binder solution.

The composition of the dry part contains, in mass parts: 65-70% of ceramic or corundum microspheres with a diameter of 3 to 100 μm, which with a minimum layer thickness provides the necessary density of the space in this layer and the reflection of the heat flux from the surface.

The composition of TZK, for example, contains, in wt.%

Ceramic evacuated microspheres - 55-70;

Pigment - 0.1-0.6;

Aluminum powder - 2.0-5.0;

Binder (see table 1) - 30-35;

The composition of TZK may contain a dispersant (talc) in an amount of 0.1-1.0 wt.%.

In this composition, aluminum powder acts as a heat reflector. Increased waterproofing provides a solution of bitumen in white spirit and xylene.

Table 1 Binders for metal wood, brick, concrete plaster, cable, polymers 1 2 3 4 Limits t ° C (-50) - (+ 250) (-50) - (+ 250) (-40) - (+ 90) (-40) - (+ 90) Areas of use Organosilicon Example-СО-060 Polyether Epoxide Example-EF-070 + Bitumen Solution Dispersion: acrylic latex. Acrylmethylmethacrylic PVA, acrylic -50. E-P-50, AV-498-I44, Novopol-110, EDSB-95 Indoors + + + + Direct atmospheric effects + + Coat with a protective varnish + + Vapors of aggressive liquids + + - Coat with a protective varnish + Note: 1. Coat with protective varnish +: TZK is applicable with appropriate binders when exposed to vapors of aggressive liquids requiring protective varnish coatings with a layer of 0.10 mm. 2. - TZK is not applicable with the corresponding binder in the presence of vapors of aggressive liquids.

table 2 No. p / p Material Thickness mm
With a specific weight = 0.55 ± 0.05 1. Pipeline, metal. 1-1.5 2. Tree wall 0.5-1.2 3. Polymers 0.6-0.9 4. Cable 0.6-0.9 5. Metal roof 0.8-1.2 6. Brick or plastered surface. 0.5-1.2

Examples of specific compositions of thermal protective paints are shown in table 3.

Table 3 Name Composition 1, wt.% Composition 2, wt.% Composition 3, wt.% Microspheres vacuum ceramic MS-VP-09 60 55 - Vacuum corundum microspheres “T” - - 60 Polyester Epoxy Resin - EP-079 thirty thirty - Organosilicon polymers - СО-060 - - 35 Aluminum powder 5 5 4.8 Pigment: 1-2 - titanium dioxide; 3 - aluminum trihydrate 0.2 0.5 0.2 Solvent 4.8 - - Bitumen (solution in white spirit and xylene) - 9.5 -

Claims (2)

1. Thermal protective paint containing evacuated microspheres, a binder, a pigment and an additive, characterized in that as evacuated microspheres it contains ceramic or corundum microspheres with a density of 300-400 kg / m ³ , with the following mass distribution of microspheres in size, wt.%: Base diameter 30-60 microns 45-55 Diameter 3-10 microns 15-17 Diameter 11-20 microns 8-10 Diameter 21-30 microns 6-8 Diameter 61-70 microns 9-11 Diameter 71-80 microns 4-6 Diameter 91-100 μm 2-4 as a binder, it contains resins selected from the group including organosilicon, polyether epoxy, acrylic dispersions, as an additive - a reflector - aluminum powder, in the following ratio of ingredients, wt.%: The above evacuated microspheres 55-70 Pigment 0.1-0.6 Reflector - aluminum powder 2.0-5.0 The above binder 30-55 2. The paint according to claim 1, characterized in that a solution of 30% bitumen in white spirit and xylene 30% of the total weight of the solvent is used as a solvent for the polyester epoxy resins.