Composition for preparing anticorrosive, refractory and heat-insulating cover and its using

FIELD: special cover materials.

SUBSTANCE: invention relates to a method for preparing anticorrosive, refractory and heat-insulating cover and its using. The composition comprises the following components, wt-%: sodium or potassium water glass, 4.5-95.0; mixture of hollow microspheres as a filler, 4.5-95.0; non-ionogenic surface-active substance, 0.5-20.0; swollen vermiculite or asbestos fibers as reinforcing filler, 0.0-50.0, and titanium dioxide, 0.0-20.0. Hole microspheres are chosen from the group comprising hollow polymeric microspheres, hollow technogenous microspheres or mixtures of microspheres. Microspheres are taken in limits of their sizes from 10 to 500 mcm with the filled value in limits from 50 to 650 kg/m3. Invention provides enhancing the anticorrosive resistance, refractory and heat-insulating stability, and to simplify technology for making the cover.

EFFECT: improved preparing method, improved and valuable technical properties of cover.

2 cl, 2 tbl, 4 ex

 

The invention relates to the chemical industry and for the creation of anti-corrosion, fire-resistant and heat-insulating coatings, particularly coatings of pipelines operated in areas of permafrost, under water and at high temperatures and pressures inside and outside the pipeline. The invention can be used in oil, gas, petrochemical industries, as well as in utilities, protection of metals, concrete.

Liquid glass has long been used to obtain corrosion-resistant and heat-insulating materials, including coatings.

Known composition for the protection of metallic pipelines from corrosion, comprising (in wt.%) viola cement - 30-35, sodium liquid glass - 15-20, the best choice latex - 0,7-1,5, stabilizer latex - 0,03-0,07, trisodium phosphate - 3,6-4,2, fiberglass - 0,5-1,0, water - the rest (SU 1717580, 07.03.1992).

The coating obtained from the composition has a reduced diffusion permeability (diffusion coefficient 6,36-6,2*109m2/s); high adhesion (adhesion to steel 0,82-of 0.91 MPa), but does not provide the necessary insulating properties.

Known heat insulating materials based on liquid glass used in construction, aviation, automotive, and transport. Thus, a method of obtaining t is playsessions material, containing liquid glass, silica fume, sodium bicarbonate, comprising granulating the mixture, the heat treatment for one hour at 100°and 1 hour at 250°With (see RF patent 2128633). The technical result is to increase strength, lower heat treatment temperature, simplifying the technological process of production of heat-insulating material.

There is a method of producing granulated foamed materials based on liquid glass for insulation materials with the addition of calcium hydroxide, ground sand, silicone fluids, comprising a stage of mixing of the components within 5-60 minutes, the formation of granules by punching through holes 1-3 mm, after which the granules are dried at a temperature of 60-100°C for 1-15 minutes, then foamed at a temperature of 360-800°C, for 0.1-15 minutes (see RF patent 2087447, 20.08.1997).

Also known raw mixture for fire protection and insulation products, in particular plates, including exfoliated vermiculite, liquid glass and additive as an additive it contains dolomite grain structure of the residue on the sieve NN C and 01 respectively To 3 and 40-70 wt.% in the following ratio of components of the mixture (wt.%):

Exfoliated vermiculite30-40
Liquid glass30-60
Dolomite10-30

the raw material mixture further comprises alkylsilane sodium (EN 2126776, 27.02.1999).

However, all these known technical solutions focused on the obtaining of coatings, and molded products in the form of, for example, insulation boards and are used as structural elements for insulation in the main building, metallurgy, do not provide the necessary corrosion protection, as well as the required level of thermal protection, especially pipelines.

Know the use of hollow microspheres as filler in polymer materials, including such inorganic polymers, which include liquid glass.

Thus, a method of obtaining heat-insulating material of the hollow microspheres fly ash, comprising the mixing of 83% by weight of hollow microspheres and 13% solution of liquid glass (sodium silicate). Pressing the resulting mixture of plates and subsequent vulcanization at 200°C for 3 h (SU 1724524, 07.04.1992, description), however, and this song is pressing, requires equipment for compaction and subsequent fixation plates on the insulated surface, mainly railway tanks for petroleum products and is not intended to produce coatings.

WPI the walls insulating composition, including liquid glass hollow microspheres selected from fly ash (1-50 wt.%) and special additives in the form of silica powder, oxide, carbonate or borate zinc to 15 wt.% (GB 1550184, 1979).

The disadvantage of this structure is the high mass of insulation, insufficient heat resistance.

Know of any other insulating composition containing as a binder liquid mineral glass hollow microspheres based on silicon-containing substance as a refractory filler, as a curing agent and structure formation silicofluoride salt of an alkali metal, and as specified filler - glass microspheres and microspheres in the form of flue waste burning coal not less than 80 wt.% the last relative to their total number in the particle size range 10-300 μm, in the following ratio, wt.%:

Silicofluoride salt of alkaline metal3-11
Hollow microspheres based on silicon-containing substance20-45
Liquid mineral glassRest

To provide an additional increase heat-resistance insulating composition additionally contains aluminum polyphosphate in the following ratio, wt.%

Silicofluoride salt of alkaline metal3-11
Hollow microspheres based on silicon-containing substance20-45
Polyphosphate aluminum3-15
Liquid mineral glassRest

(EN 2098379, 10.12.1997).

According to the invention the composition for insulating material is prepared as follows.

Pre-receive a plastic mass by mixing the required quantity silicofluoride salts of alkaline metal and silicon-containing binder aqueous solution of alkali metal silicate (i.e. liquid mineral glass).

Binder and silicofluoride salt is brought into contact by sequential dosing, followed by stirring to ensure uniform mutual redistribution and avoid clumping mass.

By the gravimetric method is metered by the sequential introduction of portions of the refractory filler, which are offered to the use of hollow glass microspheres and hollow microspheres in the form of waste by burning coal, which contain silicon compounds. The whole composition is thoroughly mixed to ensure uniform distribution of the variance of napolnitel is in the liquid binder.

Additionally, the insulating composition is administered aluminum polyphosphate. Composition containing all of the components listed above, after the mixture is subjected to molding by the method of free casting into molds to obtain a porous preform. In the molding process on the samples affected by the heat flux in the temperature range 300-400°that is enough to remove most of the solvent (water) and curing the composition.

However, the data known compositions are intended primarily for obtaining molded products, the so-called glass-ceramic materials, mainly used in construction.

The closest in technical essence and the achieved result to the present invention is a known technical solution relating to the receipt of heat, flame retardant foaming coating surfaces (2162871, 10.02.2001).

The coating comprises an outer layer of chlorosulfonated polyethylene and at least one layer comprising liquid sodium glass, hardener - sodium silicofluoride, filler - chamotte, Aerosil and glass fibers with a length of 5-10 mm, pigment inorganic and crystalline. The combination of components in a certain ratio reduces the toxicity of the composition, increase of resistance of the coating layer to vibration and static loads, Eisenia coefficient of thermal diffusivity.

However, this coating is obtained by sophisticated technology and does not provide the required level of thermal insulation and anti-corrosion properties in the protection of pipelines.

The technical objective of the claimed invention is to simplify the technology for coating and increase the protective properties as corrosion and fire resistant and heat insulation, in particular in the protection of pipelines.

The goal of the project is achieved in that the composition for obtaining corrosion and heat-resistant coating, including water glass sodium or potassium as the binder matrix and the filler comprises a filler mixture of hollow microspheres with different sizes in the range of 10-500 μm and with different bulk density in the range from 650 to 50 kg/m3selected from the group comprising hollow glass microspheres, hollow ceramic microspheres, hollow polymeric microspheres, hollow man-made (ash) microspheres, or a mixture thereof, and optionally the composition further comprises a reinforcing material in the form of expanded vermiculite or asbestos fibres, and also, possibly, titanium dioxide, and optionally contains an inorganic surfactant in the following ratio, wt.%:

Liquid sodium or potassium glass4,5-95,0
The above mixture of hollow microspheres4,5-95,0
Expanded vermiculite or asbestos yarn0-50,0
Titanium dioxide0-20,0
Nonionic surfactantof 0.5 to 20.0

The composition according to the invention contains as a binder matrix sodium or potassium water glass with a density predominantly for example 1.18 to 1.45 g/cm3(specific gravity), silicate module to 4.3 (2,7-4,3) represent aqueous solutions of inorganic polymers containing hydrated monumentation alkali metal and silica oxide anions of low polymerization degree.

As hollow microspheres composition contains a mixture of hollow microspheres with different sizes ranging from 10 to 500 μm and with different bulk density in the range from 650 to 50 kg/m3selected from the group comprising hollow glass microspheres, hollow ceramic microspheres, hollow polymeric microspheres, hollow man-made (ash) microspheres, or a mixture thereof, which can significantly improve the efficiency of surface protection against corrosion and thermal insulation properties.

Hollow microspheres are one of the most famous order of the indices, used in the manufacture of plastics. The spherical shape controlled size and low density make them they are often irreplaceable. An important effect of applying them is to reduce costs of expensive or scarce polymers, as well as a decrease in the density. Traditionally they have a size of from 25 μm to 50 mm and a density of from 100 to 700 kg/m3.

So, in the claimed invention using mixtures of hollow microspheres (glass, ceramic, polymer, ash) are the same or different, but with different sizes in the range from 10 to 500 μm and a variety of bulk density in the range from 50 to 650 kg/m3allows to significantly improve the efficiency of protection of surface treated materials (wood, concrete, plaster, metal from corrosion and thermal insulation.

Such properties of hollow microspheres as low Malopolskie, inertness and ease of dispersion makes them very attractive as fillers.

Hollow microspheres of glass, ceramics, polymers predominantly obtained by introducing a blowing agent into the basic material, the subsequent grinding and heating for foaming of the blowing agent.

So, for example, hollow microspheres obtained by transmission of small particles containing porofor through the high temperature zone; particles melt or soften in hot is she, and the blowing agent forms a cavity inside the particle, expanding them. Upon cooling of the sphere in the air its walls harden. Either get them by foaming glass (or ceramic) particles in the flame of the burner, etc. as hollow glass microspheres are used for example microspheres of the type of Glass Babes, type Myrobalan; globanet, spherulite. Ceramic microspheres are also by burning natural materials and foaming.

Polymeric hollow microspheres receive as a rule or suspension polymerization of the monomers with the addition of pore-forming (porofor, inert gases, low boiling hydrocarbons), or by physical or chemical foaming ready polymeric regrind particles. As hollow polymeric microspheres of the invention using hollow microspheres, for example of polystyrene, based on phenol-formaldehyde resins, silicone, urea-formaldehyde resins, and others.

As the nonionic surfactant composition according to the invention contains a surfactant, for example, as surfactants based on tert-dodecylamide of tiefer of polyethylene glycol, polyoxyethylene mono (C11-alkyl) sorbitol, polyoxyethylene ethers of ALKYLPHENOLS (OP-4, OP 7, OP-10), polyoxyethylene esters of fatty acids, polyoxyethylene esters of alcohols and other ("the encyclopedia is Kerov", Vol.2, M, Owls. Encyclopedia, 1974. s-670). Introduction surfactants can improve the wettability of the coated surface, to improve the uniformity of distribution of the filler in the composition, the stability of the composition, and the protective properties of coatings obtained.

The technical problem is also achieved by the use of this composition claimed as one of the inventions claimed the group, as thermal insulation, fire-retardant and corrosion-resistant coating of pipelines.

The composition according to the invention is obtained by thoroughly mixing the microspheres with liquid glass in the form of a solution of a certain density in the presence of nonionic surface-active substances (surfactants). If necessary, in order to enhance corrosion protection and thermal insulation properties of the coating composition additionally injected reinforcing fillers in the form of expanded vermiculite or asbestos fibres, and titanium dioxide.

In the following table 1 shows specific examples stated as as the invention compositions, and table 2 shows some properties of the obtained coatings.

The prepared composition is applied on a metal surface such as the surface of the heat pipe supply with the surface temperature of +115°; layer thickness of about 0.5 mm; after drying on the surface the STI pipe put the next one or more layers with a total thickness of about 2-3 mm In the result, the temperature on the surface of the pipe decreased by +30°-°+40°C.

-
Table 1
Name of the componentThe content of components according to the examples, wt.%
example 1example 2example 3example 4
Itkee glass:95,0
liquid sodium glass module 3.2 and density of 1.45 g/cm34,5
liquid potassium glass module 4.0 and a density of 1.18 g/cm3-40,030,0-
2. A mixture of hollow microspheres:95,04,510,04,5
a mixture of hollow glass microspheres with a size of 35 microns and a density of 650 kg/m340,0-2,0-
- glass microspheres with a size of 100 μm and a density of 150 kg/m348,0-5,0-
- glass microspheres with a size of 200 microns and a density of 70 kg/m37,03,0-
the mixture of polymer microspheres:
- polystyrene microspheres with a size of 10 μm and a density of 650 kg/m3-1,0-0,5
- polystyrene microspheres with a size of 500 μm and a density of 50 kg/m3-0,5-2,0
- polystyrene microspheres with a size of 50 μm and a density of 400 kg/m3-3,0-2,0
3. Nonionic surfactants - polyoxyethylene ethers of alkyl phenols OP 70,55,520,00,5
4. Exfoliated vermiculite--20,0-
5. Asbestos yarn-50,0--
6. Titanium dioxide20,0

Table 2
The basic properties of coatings based on the composition of the invention
Indices examples
1234
The adhesion score1111
Hardness Ratnikova device0,550,70,60,7
Elasticity, mm1111
Resistanceweather resistant
Water resistancewaterproof
Gas and vapor permeability
Corrosion resistancewithstand the salt and oil products
Firenot flammable
The insulating propertieswithstand temperatures of 500-1000°C
not destroyed

1. Composition to obtain a corrosion-resistant, fire-resistant and heat-insulating coating comprising liquid sodium or potassium glass as a matrix and a filler, wherein the filler it contains a mixture of hollow microspheres, distinguished by their size in which the limits of from 10 to 500 μm and a bulk density in the range from 650 to 50 kg/m 3selected from the group comprising hollow glass microspheres, hollow ceramic microspheres, hollow polymeric microspheres, hollow man-made microspheres, or a mixture thereof, further comprises a nonionic surfactant and optionally a reinforcing filler in the form of expanded vermiculite or asbestos fibres and titanium dioxide in the following ratio, wt.%:

Liquid glass is a sodium or potassium4,5-95,0
The above hollow microspheres in the form of a mixture4,5-95,0
Nonionic surfactantof 0.5 to 20.0
Expanded vermiculite or asbestos yarn0,0-50,0
Titanium dioxide0,0-20,0

2. The use of a composition according to claim 1 as a protective fire-resistant, thermal insulation and corrosion-resistant coatings for pipelines.



 

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