The composition to obtain a zinc-coating

 

(57) Abstract:

Describes the composition to obtain metallic zinc-rich coating containing acenocoumarol binder based pentaftalevyh resin modified one of the polymerization or polycondensation resins and powdered zinc. The composition contains a binder having a dry residue in the number of 18 and 45 wt.% and zinc powder with spherical particles whose size is in the range of 1-15 μm at a mass ratio of components, wt. %: binder 20-50, zinc powder 50-80, with the mass ratio of solids in the binder to zinc powder in the composition is 15:85-10: 90. Composition allows you to receive zinc-rich coating with equally high protective, electrically conductive and adhesive properties, but with selectively different consumer: for construction - high atmosphere - and the resistance to the oil and gas industry with high water and chemical resistance, mechanical engineering with high hardness and resistance to shock, etc. 1 C.p. f-crystals, 2 tab.

The invention relates to the creation of anticorrosion coatings based on zinc-rich polymers and can be used in the domain, the oil industry and other

Effective application for corrosion protection filled with metal coatings have long been proven. Published information on the creation and study of the properties filled with metal coatings. (E. M. Arachova and others filled with metal coating. Overview UNITECHEM, M. , 1980). However, the search for the optimum compositions for preparation of anticorrosive coatings continues. Permanent changes in economic conditions, primarily in Russia, leads to the search for creative professionals in the direction of the development of, first, unclaimed scientific and technical achievements of the Motherland and, secondly, the use of existing well-established production of film-forming and zinc powder. The search goes on creating universal composition having wide scope. Following this direction, created cinnabarina primer based on alkyd pentaftalevyh varnish, modified epoxy-fatty acid-oligomer (RF patent N 2066434, publ. 1996), which is the closest to the claimed solution.

Known technical solution is an attempt to create in the existing economic what I went towards increasing the sedimentation stability of the primer by introducing into the composition thixotropic additives - poliatilmocevina and drying at a relatively low content of zinc powder. Solving this problem, the authors achieve system stability "svjazujushee zinc powder and get through this one-component system. Poliatilmocevina improve the thixotropy of the system, because the surface-active substance in relation to zinc and its molecules are adsorbed on the surface of zinc particles, contributing to a loose and easy Usacheva sediment particle powder zinc after long-term storage of one-component systems. With a large number of poliatilmocevina (6.5 to 10%) the resulting composition provides improved sedimentation stability of the powder particles of zinc, because it has a higher viscosity, which is the reason that the obtained primer before application to the surface needs to be diluted with xylene to a viscosity 16-20 C. Thus, if you approach composition from the viewpoint of processability, it is ultimately two: "concentrated prefabricated primer and solvent. So, as practice shows, for industrial use improved thixotropy and sedimentation stability of zinc-rich composition the most important are those characteristics, which provide high performance anticorrosive properties of the coating obtained after application of cinnabarinus composition on the metal surface of the protected product or object with the maximum number of technological advantages.

From this point of view, the known solution due to the low content of zinc powder in the primer and, therefore, coverage is likely to create a system where in a dry coating particles chink will be at a remote distance from each other. This fact in combination with the high fineness of the powder, which is used in the known solution, leads to the fact that the properties of the coating to a greater extent determined by the properties of a binder, which may not provide a high protective properties of the coating. Low tread properties and low conductivity inevitably lead to poor weldability primed surfaces. Without additional Stripping their welding impossible.

The purpose of this technical solution is to create a structure to receive zinc-rich coatings for various industries, providing after applying any proci corrosion of cinnabarinus coating with high protective properties, high adhesion to smooth, not grovestreet surface, high weather - resistance, high chemical resistance, high hardness and wear resistance, resistance to shock and elasticity in bending, as well as electrical conductivity, providing the possibility of welding products and designs without Stripping the welded edges.

For task composition for applying zinc-rich coating contains a binder belonging to the class acenocoumarol limited pentaftalevyh component, which modified one of the polymerization or polycondensation resins. This binder should have a dry residue in the number of 18 and 45 wt.%, zinc powder is used with spherical particles, the particle size is in the range of 1-15 microns, and a mass ratio of components, wt.%: binder 20-50, zinc powder 50-80. And the mass ratio of solids in the binder to zinc powder in the composition is 15:85-10:90.

For ease of preparation of the composition, you can use a calculation formula to determine the amount of zinc powder, depending on the proportion of solids in the binder

< / BR>
where CZn- the number of efficient, equal 0,111-0,176

The invention consists in the following.

Today, as a rule, anti-corrosion coating may have a high weather - resistance, but it has low chemical resistance, or possessing high strength and hardness, has a low elasticity, etc. Binder declared class because of the small number of modifying resins have almost the same physical and mechanical properties, which ceteris paribus define one of the most important indicators of cinnabarinus cover - optimal ratio between the amount of dry residue of the binder and the amount of powder of zinc in the composition. In other words, this optimum ratio is the same for a number of compositions based on pentaftalevyh resin modified any of the polycondensation or polymerization resins. Finally, a number of structures on the basis of the same powder zinc and various acenocoumarol binder provides a corrosion-resistant coating with almost the same tread, electrically conductive and adhesive properties, but various special - weather resistance, water resistance, histone result, obtained by the authors, is that they managed to dry cinnabarinum the floor to achieve the maximum degree of filling of the zinc coating particles so that the surface of all the zinc particles coated material of the dry residue of the binder and zinc particles are located at the minimum possible distance from each other.

Experiments have shown that in the case of low content of zinc in the composition and, therefore, in coating the particles of zinc in the dry coating are at a remote distance from each other, which leads to lower conductivity, because in this case the properties of the coating to a greater extent determined by the properties of the binder. In the case of excessive zinc content of dry residue of the binder is insufficient to ensure the formation of a protective coating on all the particles of powder of zinc and fill the space between them, which leads to deterioration of adhesion and the appearance of pores in the coating. The shape and size of the particles of zinc powder are needed to solve the problem, because when using pulverized powders of irregular shape cannot achieve dense packing, which leads to uvelichenie specific surface area, and, therefore, the overall surface composition, which is distributed dry residue of the binder. The finer the powder, the greater the surface it has and the greater the amount of dry residue of the binder required per unit mass of the powder to provide a continuous protective sheath. Recently, Russia has developed the production of fine zinc powder, extends in the development of more sophisticated coatings.

Received in the claimed solution of the technical result allows to obtain the composition for obtaining cinnabarinus cover with equally high protective, electrically conductive and adhesive properties, but selectively different in other indicators with regard to the requirements of various industries: construction - coating with high resistance to weather and water resistance for the oil and gas industry - coatings with high water and chemical resistance, for engineering coatings with high hardness and resistance to shock, etc.

Example. A binder was prepared as follows.

Menolascino. In the mixer was downloaded 100 m H. 40% solution pentaftalevyh resin in xylene, obtained in a known manner. When Paestum way condensation of n-tert-butylphenol with formaldehyde in an alkaline environment. The mixture produced at room temperature for one hour.

Alkyd-urea-formaldehyde or melamine-formaldehyde binder was prepared: 10 PM hours 40% solution pentaftalevyh resin in xylene, obtained in a known manner, for example, alcoholysis, was mixed with 20 m H. 40% solution in butanol of urea-formaldehyde or melamine-formaldehyde resin obtained in a known manner the condensation of formaldehyde with urea or melamine in the presence of an alkaline catalyst. The mixture produced in a standard mixer at room temperature (1 h). Oracene binder was prepared in a heated reactor was loaded 100 m H. a 50% solution pentaftalevyh resin in white spirit and was heated to a temperature of 90oC. At this temperature gradually in portions of 1 m H. added toluylenediisocyanate until free isocyanate groups. Then was added 1 m h 50% solution pentaftalevyh resin in white spirit to link that appears free isocyanate groups. The mixture was cooled and introduced 3 m H. dryers. Then added white spirit to create a dry residue 40% wt. In the reaction of isocyanate groups with hydroxyl groups pentaftalevyh resin formed by the Czech resistance.

Acidsolitaire binder was prepared in a heated reactor was loaded 100 m H. a 50% solution pentaftalevyh resin in xylene. Under stirring was added 50 meters including styrene, 70 hours of xylene and 3 m H. a 3.5% solution in xylene of a reaction initiator (peroxide benzene or Gidropress of isopropylbenzene). The mixture was heated to a temperature of 130oC and was stirred for 27-30 hours. The resulting solution acidsolitaire binder was cooled and used to obtain the claimed composition. Due to the polymerization of styrene with unsaturated bonds of fatty acids, which are an integral part of the molecule pentaftalevyh resin, increases the hardness and water resistance of coatings based on acidsolitaire binder.

Alkeneamine binder was prepared in a heated reactor was loaded 10 m H. a 50% solution pentaftalevyh resin in xylene. Added 70 hours of xylene, 30 m H. butyl ester of methacrylic acid and 2 m H. 3,5% xylene solution of peroxide of benzene. Was heated to a temperature of 60-95oC and was stirred for 8-10 hours. The resulting binder solution was cooled and added 3 m H. dryers. Due to polymerization of the butyl ester of methacrylic acid with unsaturated bonds of fatty acids is 2">

Epoxyalkanes binder was prepared in a heated reactor was Loaded 100 m H. a 50% solution pentaftalevyh resin in xylene. Added 30 m H. 6% solution in xylene epoxy resin brand ED-20, was heated to a temperature of 145oC and was stirred for 3 hours. The coating on the basis of the obtained binder has high adhesion to various materials and chemical resistance, particularly alkali.

From the resulting binder was prepared 6 compositions for preparation of zinc-rich coatings. Used zinc powder with spherical particles whose size is in the range of 1-15 microns across 0165-02-92. The production of this fine zinc powder already established in sufficient quantities in the Russian Federation. Quantitative characteristics of compounds 1-6 are shown in table 1.

For the preparation of the powder of zinc in accordance with table 1 was filled in a binder with stirring, then was stirred for 15-30 minutes, then was filtered. As the samples used standard plates of the Article. 3 size x mm, thickness 2 mm Samples previously degreased with a solvent or degreasing solution.

The prepared composition was applied in 2 words what s coverage maintained for 7-10 days, then subjected to the tests. Properties of coatings for compounds 1-6 are shown in table 2, from which it is evident that consumer properties achieved in the use of the proposed solutions are high and the composition is quite universal. From the description of the exemplary embodiment shows that the composition is more and more high-tech.

1. Composition to obtain metallic zinc-rich coating containing alkyd-combined binder based pentaftalevyh resin modified one or polymerization or polycondensation resins and powder of zinc, characterized in that it contains a binder having a dry residue in the number of 18 - 45 wt.%, and zinc powder with spherical particles whose size is in the range of 1 to 15 μm, when the mass ratio of components, wt.%:

Binder - 20 - 50

Zinc powder - 50 - 80

when the mass ratio of solids in the binder to zinc powder in the composition is 15:85 to 10:90.

2. Composition under item 1, characterized in that it contains zinc powder, the amount of which corresponds to the formula

< / BR>
where CZnthe amount of zinc powder in the composition, wt.%;

NC. O.

 

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Alkyd enamel // 2139311
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4 cl, 2 tbl, 5 ex

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EFFECT: improved physicochemical properties of lacquer materials (hardness, elasticity).

3 cl, 4 tbl

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2 tbl, 1 ex

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3 tbl, 2 ex

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