Anticorrosive coating for gross defects

 

(57) Abstract:

The invention relates to compositions intended to eliminate the defects and protection from moisture primed or unprimed metal or non-metal surfaces. Corrosion-resistant coating consists of a filler, which is used as polydisperse powder of zinc in the amount of 80-90 wt.% by weight of the filler, and ethyl silicate binder comprising ethyl silicate, polyvinyl butyral, phosphoric acid (73%), ethyl alcohol, water. Polydisperse powder zinc used the following granulometric composition, wt.%: the fraction less than 63 μm is not less than 50.0; fraction 63-160 μm is not more than 40,0; fraction more than 160 μm is not more than 10.0. The combination of components in a certain ratio allows to obtain a coating with improved adhesion and strength properties, high resistance to cracking and minimal shrinkage, suitable to correct major defects. table 1.

The invention relates to compositions intended to eliminate the defects and protection from moisture primed or unprimed metal or non-metal surfaces and can be used to align m the conditions and situations indoors.

Known filler for straightening vehicle bodies, comprising unsaturated polyethyleneterephtalate resin, the monomer solvent is styrene, the initiator is benzoyl peroxide, accelerator - dimethylaniline, pigment - minium and zinc oxide, filler Aerosil and talc, styracaceae TPR, paraffin wax and the plasticizer is dibutyl phthalate (patent RU 2016029, IPC 09 D 5/34, 167/06, 1994).

Famous putty difficult to manufacture, environmentally hazardous and does not provide corrosion resistance during operation of the vehicle.

Known odnoupakovochnye filler for correction of defects in the metal and wooden surfaces, comprising a mixture of pigments and fillers in the environment alkyd-styrene varnish (mark MC-006), environment polivinilhloridnyi resin in organic solvents with addition of plasticizer (brand HV 004), in the environment pentaftalevyh varnish with the addition of organic solvents (grade PF-002). [GOST 10277-90 "Filler"].

Widely known both supplied in two packages putty, used for metal and non-metal surfaces based on epoxy film-forming agent, which makes it possible to eliminate defects and to provide protection from Wallpaper mixture of pigments, fillers, plasticizers, solution of epoxy resin in organic solvents, and the functional additive is a hardener. [GOST 28379-89 "Filler EP-0010 and EP-0020"]. The filler used inorganic materials group - chalk, talc, mica, Aerosil, basalt dust in an amount up to 40 wt.%, as pigments used known inorganic pigments in an amount up to 10 wt.%.

Known fillers do not provide corrosion protection for metal surfaces, are toxic and flammable, characterized by low adhesion properties, the operation of the crack, forming cracks have enough high stability and require additional machining before applying primer or top coat.

The objective of the invention is to provide a filler composition suitable for removing coarse defects, allowing for one application to level the surface with improved adhesion to the metal surface and protects it from corrosion damage.

This object is achieved in that the filler consists of fill is from.% by weight of fillers, and as the binder, use of ethyl silicate binder in the following ratio, wt.%:

Ethyl silicate - 11,5 - 12,7

The butyral - 5,5 - 7,7

Orthophosphoric acid (73%) - 0,15 - 0,45

Ethyl alcohol is 72.1 - 76,5

Water - the Rest

In use as a filler powder zinc grades PCR-1 (zinc powder obtained by atomization of molten zinc inert gas) TU 0165-15-98 or PC-6 GOST 12601. Powder brand PCR-1 has the following composition, wt. %: fraction less than 63 μm is not less than 50.0; fraction 63-160 μm is not more than 40,0; fraction more than 160 μm is not more than 10.0. Powders of zinc these brands have a high coefficient of polydispersity. The particle shape is varied: there are spherical particles include particles of scaly form, the particles have an elongated oblong shape.

Ethyl silicate binder is produced in industrial scale by THE 6-10-1468-79 or THE 2311-019-12288779-99.

The comparison of the proposed putty with known allows to make a conclusion on the compliance of the claimed invention, the criterion of "novelty" because the proposed composition is made in a new joint filler binder is ethyl silicate binder, and as an active filler it contains polydisperse zinc is different compositions as pigments and functional additives, provides anti-corrosion properties. In the claimed composition powder zinc used simultaneously as an active filler, pigment, anti-corrosion agent and a thickener, which allows to obtain a new technical result - non-shrinking putty for gross defects of the metal surface with high anti-corrosion properties. The use of polydisperse powder zinc allows the filling of the filler in an amount up to 90 wt.% in the liquid state. The variety of shapes and sizes of the powder particles of zinc allows you to get the most tightly Packed. High filling putty powder zinc also provides high anti-corrosion properties of the finished product. Obtained by curing the structure of the filler is characterized by extremely low shrinkage, which allows one to eliminate the rough metal surface defects in defect elimination produces strong, resistant to different kinds of influences material. Thus, the use of the claimed composition allows to obtain a new technical result - non-shrinking putty for gross defects with high anti-corrosion properties. All the above allows redlagaemaya putty can be made of known materials, in known equipment. This allows to make a conclusion on the compliance of the claimed invention, the criterion of "industrial applicability".

The mechanism of formation of structure of the inventive putty ensured by the properties of ethyl silicate binder, as well as the properties and shape of the powder particles of zinc. When included in the ethyl silicate binder polydisperse powder zinc forms a colloidal structure, close to the pasty. The structure of the filler is an interacting micelles formed by the powder particles, enclosed in a shell of ethyl silicate binder. Additional structuring of the system occurs due to a chemical reaction polysiloxanes containing reactive Oh-groups with metallic zinc. Different forms micelles (spherical flaky and elongated) provides a tight packing and using it provides minimal shrinkage. In addition, the powder of the zinc in the presence of acid, and also due to the moisture on the surface of the particles in the air, accelerates the curing process of the film. The metallic nature of the pigment, and therefore, the chemical bond through chains polysiloxanes with powerhnostnoj surface and is resistant to water and solvents. The resulting properties of the fillers provide the ability to eliminate rough defects. The resulting coating has the consistency of paste, is deposited and compacted directly in the defect with a trowel and then remove excess putty. After drying putty filling defect volume filler has no cracks, the resulting surface has a rough character, which eliminates the need for additional mechanical processing before applying primer or top coat. Putty is suitable for sealing gross defects in the installation of metal structures, as well as when carrying out repair works on the operating objects. Putty is also characterized by high resistance to cracking and cracking during operation and heat resistance, i.e., can be used for objects that are operated at temperatures up to 150oC.

The claimed coating was prepared as follows.

In the ethyl silicate binder composition, wt.%:

Ethyl silicate - 11,5 - 12,7

The butyral - 5,5 - 7,7

Orthophosphoric acid (73%) - 0,15 - 0,45

Ethyl alcohol is 72.1 - 76,5

Water - the Rest

enter polydisperse powder zinc COLINAS paste. After the mixture was incubated for at least 30 minutes to remove bubbles. The putty is to be applied on prepared surface, directly into the defect, then with a spatula compacted mass and remove the excess.

The invention is illustrated by examples of specific performance.

Example 1 (invention)

In the ethyl silicate binder (20 wt.% by weight of the filler) are introduced with stirring powder zinc brand PCR-1 (80 wt.% by weight of the filler) in natural conditions. The coating has the following composition, wt.%:

Powder zinc brand PCR 1 - 80

Ethyl silicate binder - 20

Ethyl silicate binder using the following composition, wt.%:

Ethyl silicate - 11,5

Polyvinyl butyral is 5.5

Orthophosphoric acid (73%) - 0,15

Ethyl alcohol is 72.1

Water - 10,75

The resulting coating after mixing stand 30-40 minutes to remove bubbles. Then bring in a defect depth of 5 mm and seal, removing the excess with a spatula. The resulting coating was tested according to GOST 10277-90. The data given in the table.

Example 2 (invention)

In the ethyl silicate binder (15 wt.% by weight of the filler) are introduced with stirring powder zinc brand PCR-1 (the and brand PCR-1 - 85

Ethyl silicate binder - 15

Ethyl silicate binder using the following composition, wt.%:

Ethyl silicate - 12,1

The butyral - 6,6

Orthophosphoric acid (73%) - 0,30

Ethyl alcohol was 74.3

Water - 6,70

The resulting coating after mixing stand 30-40 minutes to remove bubbles. Then bring in a defect depth of 5 mm and seal, removing the excess with a spatula. The resulting coating was tested according to GOST 10277-90. The data given in the table.

Example 3 (invention)

In the ethyl silicate binder (10 wt.% by weight of the filler) are introduced with stirring powder zinc brand PCR-1 (90 wt.% by weight of the filler) in natural conditions. The coating has the following composition, wt.%:

Powder zinc brand PCR 1 - 90

Ethyl silicate binder - 10

Ethyl silicate binder using the following composition, wt.%:

Ethyl silicate - 12,7

The butyral - 7,7

Orthophosphoric acid (73%) - 0,45

Ethyl alcohol - 76,5

Water - 2,65

The resulting coating after mixing stand 30-40 minutes to remove bubbles. Then bring in a defect depth of 5 mm and seal, removing the excess with a spatula. The resulting coating was tested according to GOST 10277-90. Data providedat when mixing the powder zinc brand PCR-1 (92 wt.% by weight of the filler) in natural conditions. The coating has the following composition, wt.%:

Powder zinc brand PCR-1 - 92

Ethyl silicate binder - 8

Ethyl silicate binder using the following composition, wt.%:

Ethyl silicate - 12,1

The butyral - 6,6

Orthophosphoric acid (73%) - 0.3 to

Ethyl alcohol was 74.3

Water - 6,7

The resulting coating after mixing stand 30-40 minutes to remove bubbles. Then bring in a defect depth of 5 mm and seal, removing the excess with a spatula. The resulting coating was tested according to GOST 10277-90. The data given in the table.

Example 5 (control)

In the ethyl silicate binder (25 wt.% by weight of the filler) are introduced with stirring powder zinc brand PCR-1 (75 wt.% by weight of the filler) in natural conditions. The coating has the following composition, wt.%:

Powder zinc brand PCR 1 - 75

Ethyl silicate binder - 25

Ethyl silicate binder using the following composition, wt.%:

Ethyl silicate - 12,1

The butyral - 6,6

Orthophosphoric acid (73%) - 0.3 to

Ethyl alcohol was 74.3

Water - 6,7

The resulting coating after mixing stand 30-40 minutes to remove bubbles. Then bring in a defect depth of 5 mm and seal, removing excess spacey)

In the ethyl silicate binder (15 wt.% by weight of the filler) are introduced with stirring powder zinc brand PCR-1 (85 wt.% by weight of the filler) in natural conditions. The coating has the following composition, wt.%:

Powder zinc brand PCR 1 - 85

Ethyl silicate binder - 15

Ethyl silicate binder using the following composition, wt.%:

Ethyl silicate - 15

The butyral - 6,6

Orthophosphoric acid (73%) - 0,30

Ethyl alcohol - 71,4

Water - 6,70

The resulting coating after mixing stand 30-40 minutes to remove bubbles. Then bring in a defect depth of 5 mm and seal, removing the excess with a spatula. The resulting coating was tested according to GOST 10277-90. The data given in the table.

Example 7 (prototype)

Putty EP-0010-based epoxy resins. Epoxy putty was tested according to GOST 10277-90. The data given in the table.

As can be seen from the table, the composition of the proposed structure allows to obtain a coating with improved performance. When introduced into the composition of the filler powder zinc less than the claimed amount does not provide the necessary structure, when applied to the surface of the formed tone is zinc more than the claimed amount is formed a thick paste, which is characterized by low adhesion to the surface.

The use of the inventive putty allows qualitative eliminating rough, i.e., larger than 2 mm, surface defects. Putty has no shrinkage, very good elasticity, good adhesion to the surface and resistance to cracking during operation. Corrosion resistance in conditions of increased aggressiveness increases by 5-7 years.

Anticorrosive coating for gross defects, consisting of a filler and a binder, characterized in that the filler used polydisperse powder zinc obtained by the method of spraying molten zinc inert gas, the following granulometric composition, wt. %: fraction less than 63 μm is not less than 50.0; fraction 63-160 μm is not more than 40,0; fraction more than 160 μm is not more than 10.0, the use as a binder of ethyl silicate binder of the following composition, wt.%:

Ethyl silicate - 11,5 - 12,7

The butyral - 5,5 - 7,7

Orthophosphoric acid (73%) - 0,15 - 0,45

Ethyl alcohol is 72.1 - 76,5

Water - the Rest

putty contains powder of zinc in the amount of 80-90 wt.% by weight of the filler.

 

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