Composition for coating

 

(57) Abstract:

Usage: to protect the metal surfaces of ferrous and non-ferrous metals, PCB prolonged exposure to aggressive environments.

The inventive composition contains butanediamine phenol-formaldehyde resin 48-52%, NBR 4-6%, toluene 4-6%, ethylcellosolve rest. 5 table.

The alleged invention relates to the field of coatings of lacquer to protect the metal surfaces of ferrous and non-ferrous metals, PCB prolonged exposure to aggressive environments (mineral oils, fuels, coolants, hot water at temperatures above 100oC).

Known lacquer formulations based on phenol-formaldehyde resins, such as bakelite varnish type lbs-1 GOST 901-78 used for corrosion protection of metal surfaces. Bakelite varnishes are solutions of phenol-formaldehyde resins rezol type in ethyl alcohol. The coating on the basis of varnish lbs-1 has a water-, oil-, gasoline and resistance to thermal shock.

However, the coating has low rates of physical and mechanical properties is her. In addition, the technology of obtaining of this surface complex (speed and long drying for 7 h).

Known composition to obtain a coating for cans. Its composition consists of: phenol-formaldehyde resin 5-100 century including epoxydecane polybutadiene rubber 100 C. H. (jap. patent N 60-142625, MKI 09 D 5/00, C 09 D 3/36, 1987).

The coating on the basis of the specified composition has good adhesion, hardness, resistance to food acids. However, this coating is formed at high temperatures (up to 350oC) and does not have sufficient resistance to aggressive environments.

Also known epoxy resin composition for coating, containing in its composition diene epoxy resin 100 century. including 30-40 C. H. copolymer of butadiene and Acrylonitrile (jap. patent N 58-215463, MKI 09 D 3/58, 1983). The coating obtained from the composition has a high adhesion, elasticity, water and corrosion resistance.

The disadvantage of this coating is a low resistance to impact and instability adhesive strength of the coating during operation in corrosive environments at elevated temperatures.

Known epoxy resin composition for coating, which contains the form of metal powders, as well as curing agent and an accelerator for the curing (U.S. Pat. USA N 4695598, MKI 523/400, 1987 ). The composition used for dyeing fuel and gas fuel systems. The coating has good heat-, chemical - and corrosion resistance, as well as elasticity and adhesion.

The disadvantage of the composition is the complexity of its composition and manufacturing techniques. In addition, the coating on the basis of this composition has insufficient resistance to impact and can not withstand prolonged use in cooling fluids at elevated temperatures.

Known composition, which includes: epoxy-Novolac block copolymer 25 century. including NBR SKN 26-25 century including solvent 646 50 C. H. (M. C. Trisno, L. M. Apraksin, H. G. Boyko. Experience of application of new coatings industry, Leningrad, 1975). Coatings based on these compositions have good physical and mechanical properties, oil, water, gasoline.

The main disadvantage of these compositions is the complexity of the technology of their manufacture in mass production and, consequently, the instability properties of the obtained coatings. In addition, coatings based on epoxy-Novolac block copolymer and butadiene-nitrile rubber (KEN) is not the similar to the proposed invention, i.e., the prototype is lacquer EP-547 (THE 6-10-1395-83), which includes: butanediamine phenol-formaldehyde resin FPF-1 11,4 century including epoxy resin e-C 30 century. including resin KO-815 1,5 century. ch. of ethylcellosolve 57,1 century. ch.

The disadvantage of the Lac EP-547 is that coatings based on it is unstable to prolonged exposure to Metalworking fluids at temperatures above 100oC.

The alleged invention is directed to a formulation that allows to obtain the oil, water, fuel resistant coating with stable physical and mechanical properties (adhesion, flexibility, impact strength) when operating it in liquid corrosive fluids (antifreeze 65, aqueous solutions with additives) at elevated temperature and having a simple technology of formation of the coating.

This objective is achieved in that the composition to obtain a coating containing the oligomeric resin as a modifier NBR type SKN-26 and a solvent, according to the alleged invention as oligomeric resin contains butanediamine phenol-formaldehyde resin as a modifier further comprises toluene, and ethyl cellosolve solvent, when the following ratio is frilly rubber SKN-26 4-6

Toluene 4-6

The Rest Of Ethyl Cellosolve.

Depending on the reaction conditions, phenol-formaldehyde resins may be viscous, liquid or solid. Molecular weight resins can vary from 400 to 800 to 1,000 A. E. m. (Because Gorbunova and other Production of phenol-formaldehyde resins. M. 1983 O. C. Orlov and other Technology varnishes and paints, S. 79-92, M. H., 1990, concise encyclopedia of chemical, T. IV, S. 938, M. 1965). The average molecular weight of the resin FPF-1 470-600 (G. K. Kucherenko and other Butoxycarbonyl phenol-formaldehyde oligomer FPF-1. Coating materials and their application, No. 3, S. 21, 1985). Resin FPF-1 (TU 6-10-681-84) is a condensation product of phenol and paratrechina butylphenol with formaldehyde, partially esterified n-butyl alcohol.

Resin RB (TU 6-10-1880-82) is a homogeneous transparent solution in butanol product alkaline condensation of tricresol with formaldehyde.

Basic properties butanediamine feelin-formaldehyde resins are given in table.1.

Properties of synthetic rubbers are described in the literature: G. F. Payne Technology of organic coatings, Per. s angl. S. 402, L. H. 1959 O. C. Orlov and other Technology varnishes and paints, S. 149, M Nanoe structure. The average molecular weight polybutadiene-nitrile rubber (according to osmometry) is 200000-300000.E. m. However, in the manufacture of paints have been applied liquid rubber with a molecular weight of 800-1500. Rubber SKN-26-1A (TU 38.10316-76) is a low molecular weight copolymer of butadiene with Acrylonitrile, containing a small amount of carboxyl groups. Main indicators of the rubber SKN-26-1A on THE 38.10316-76 shown in table.2.

The choice of butadiene-nitrile rubber type SKN-26 due to the fact that he is the most polar high molecular weight compound produced from nitrile rubber, which is in wide concentration limits is well combined with butanediamine phenol-formaldehyde resins of the type RB, FPF-1 and provides coatings with desired properties. Furthermore, the residual toluene in utverzhdenii film plays the role of a modifier, a plasticizer which improves the stability of physical and mechanical properties of coatings for their operation in liquid corrosive environments.

Use butanediamine phenol-formaldehyde resin-modified rubber SKN-26 and toluene, and adjusting the ratio of componentstate coatings to the effects of coolants at temperatures above 100oC and stability of physical and mechanical properties of the coating operation in liquid corrosive environment.

Comparative analysis with the prototype shows that the claimed composition is used as an oligomeric resin, a modifier and solvent other substances, as well as their quantity. Thus, the proposed solution meets the criteria of the invention of "novelty."

In the study of the prior art known in this field, the features distinguishing the claimed invention from the prototype, were not identified. And so they provide the claimed technical solution according to the criterion of "inventive step".

The proposed composition is as follows: prepare a 50% solution of butadiene-nitrile rubber SKN-26 in toluene. Then the container is filled with the estimated number butanediamine phenol-formaldehyde resin, with stirring, add the calculated amount of 50% solution of butadiene-nitrile rubber SKN-26 in toluene and ethylcellosolve. The ratio of phenol-formaldehyde resin, 50% solution of rubber SKN-26 in toluene and ethyl cellosolve is in C. o'clock, respectively, 5:1:4. The resulting mixture peremeshivajutsa can be applied by dipping, the pour, spray, brush. To obtain a coating with the desired properties of the composition diluted ethylcellosolve to viscosity by viscometer VZ-246 with the nozzle diameter of the funnel 4 mm, the value of the viscosity of the working composition depends on the method of its application. To obtain coverage on the basis of the proposed composition of the metal surface is cleaned mechanically, degrease one of the solvents: gasoline, acetone, 646, solvent. On the prepared metal surface is applied by dipping composition, diluted with ethyl cellosolve to viscosity 14-16 with the viscometer VZ-246 with the nozzle diameter of the funnel 4 mm

The coated samples otverzhdajutsja at a temperature of 160-170oC for 30 minutes Data for the investigated compositions and properties of coatings based on them are given in table.3,4.

The adhesion of the coating to the metal surface was determined by the method of cross-hatch test according to GOST 15140-78.

The strength of the coating at the bend (elasticity) was determined according to GOST 6806-73.

The strength of the coating at impact was determined according to GOST 4765-73.

Stability of physical and mechanical properties of coatings when used in liquid corrosive environments was estimated by the change of adhesion Star with 3-component additive). Test coatings were carried out in accordance with GOST 9.403-80 at a temperature of (1205)oC for 150 h After the test, the coated samples was kept at a temperature (15-35)oC during the day and was determined physico-mechanical properties of coatings. Aqueous solution with 3-component additive consists of: potassium bichromate (0,1 century'clock), sodium nitrite (to 0.05 C. H.), water (99,8 century. o'clock). Test results are shown in table.2, is defined boundary concentrations of the components, providing coatings with optimal properties. The compositions of dispersions with boundary and optimal concentrations of the components shown in table.5.

The coatings obtained on the basis of the proposed compounds have high physical and mechanical properties and retain these properties for long term operation in cooling fluids.

The proposed structure allows to obtain a coating with improved physical-mechanical and protective properties of simplified technology.

Produced a pilot batch of varnish in an amount of 5 tons and sent to industrial tests at the Volgograd tractor plant, and Kherson and Murom canneries to obtain a protective item is in to cover, including butanediamine phenol-formaldehyde resin and ethyl cellosolve, characterized in that it further comprises a nitrile butadiene rubber SKN-26 and toluene in the following ratio, wt.

Butanediamine phenol-formaldehyde resin 48 52

The NBR SKN-26 4 6

Toluene 4 6

The Rest Of Ethyl Cellosolve

 

Same patents:

The invention relates to the field of polymeric materials, in particular compositions for coatings having anti-corrosion properties, allowing corrosion protection of equipment operating in highly corrosive environments at elevated temperatures

The invention relates to polymeric compositions for protection against corrosion, in particular to compositions for the protection of agricultural and railway equipment under the action of moisture at elevated temperatures

The invention relates to rubber chemicals-resin compositions for metal protection under the action of moisture and salt fog, used in particular in motor vehicles to cover the bottom of the wings and internal cavities

FIELD: chemistry.

SUBSTANCE: coating composition contains resorcinol-formaldehyde resin SF-282 with addition of a carbamidoformaldehyde concentrate KFK-85, and a liquid hardener of carbamide-formaldehyde concentrate - aqueous formalin solution, ethylene glycol and starch OZ-102, where components are taken in the following ratio per 100 pts. wt of the resorcinol-formaldehyde, in %: carbamide-formaldehyde concentrate KFK-85 35-50; hardener 22-25.

EFFECT: coating has short hardening time, high resistance to hydrocarbon media.

1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemical and machine-building industry and repairing equipment by applying polymer coatings on metal articles and machine components, particularly mounting seats of bearings in metal parts of machines. The coating composition contains the following components (in wt %): lacquer F-40 - 87-88; aluminium powder PAP-1 - 11.5-12.0 and bronze powder B1PP-1 - 0.5-1.0, having defined grain-size compositions.

EFFECT: invention reduces hardening temperature and time, reduces power consumption in thermal treatment of the deposited polymer coating and improves deformation-strength properties of films made from the coatings.

2 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: composition consists of the following ingredient ratio (wt %): varnish F-40 - 96…97; aluminium nanopowder - 1.8…2; copper nanopowder - 1.5…1.7.

EFFECT: increase of deformation-strength properties, namely specific work of film destruction, made by claimed composition.

1 dwg

FIELD: chemistry.

SUBSTANCE: composition for manufacturing a heat-protective coating and a method for manufacturing it are described. Composition for manufactureing a heat-protective coating includes components in the following ratio, pts wt: furfural 8.0-12.5, urotropin 0.9 -1.8, phenol-formaldehyde resin of the novolak type 8.0-14.0, butadiene-nitrile rubber SKN-40-KNT in the form of a 20% solution of the dry residue in acetone 28.0-33.0, acetone 4.0-7.0, butyl acetate 4.0-7.0, talc 18.0-23.0, mica 10.0-14.0. The method of obtaining the composition includes pretreatment of furfural, hexamine, phenol-formaldehyde resin of the novolak type into the condensation product by reacting a solution of urotropine in furfural followed by the introduction of phenol-formaldehyde resin and the formation of the binder on their basis. Then a solution of butadiene-nitrile rubber SKN-40-KNT in acetone, solvents and fillers are introduced.

EFFECT: increase of mechanical properties, resistance to oxidation of a semi-finished product, increase and stability of physical properties of the composition during its production, storage, and processing.

3 cl, 2 tbl

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