The method of applying a protective coating on the metal surface in contact with food products
(57) Abstract:The invention relates to the field of applying a protective non-stick coatings on metal products in contact with food products, and can be used to apply protective coatings on household utensils that previously were in operation. The method of applying a protective coating on the metal surface in contact with food products, includes sandblasting, coating PTFE composition, followed by heat treatment, and before sandblasting produce two firing: the first at a temperature of 410-430oC for 10-15 min, the second at a temperature of 460-480oC for 10-15 minutes the Invention allows to improve the quality of the coating and to reduce the cost of technology. The method of applying a protective coating on the metal surface, in contact with food.The invention relates to the field of applying a protective non-stick coatings on metal products in contact with food products, and can be used to apply protective coatings on cookware economic, previously were in operation.The known method of repair postreperfusion with a subsequent heat treatment of the coating at the temperature of the coating at a temperature of 250-300oWITH [I].The method ensures the prevention of cracking glass cover.However, this method of electric arc spraying titanium causes a significant temperature gradients on the surface up to 700oThat results in the through-porosity titanium matrix, melt the aluminum alloy substrate of thin-walled products, the penetration of metal ions to food contact surfaces.The closest technical solution adopted for the prototype, is how to handle the internal surfaces of the baking forms, described in the patent of the Russian Federation 2025977 C1, publ. 09.01.1995, including sandblasting and coating PTFE composition, followed by heat treatment.However, for processing household utensils, mostly pans, which have a metal surface contaminated with organic sediments, heat treatment leads to self-heating and destruction of the metal substrate.In addition, the known method may not be applicable for thin-walled parts made of aluminum alloys, because of their low heat capacity.An object of the invention is to improve the quality youcause sandblasting, the fluoropolymer coating composition and its subsequent heat treatment, according to the invention, before sandblasting produce two firing: at a temperature of 410-430oC for 10-15 min, the temperature 460-480oC for 10-15 minutesThe claimed invention meets the requirements of unity of invention, because the proposed set of optimal parameters of operations solves a single problem with obtaining a useful result.A positive result is the following:
- prevents the possibility of melting of thin-walled workpieces of aluminum alloys containing significant amounts of oils and fats on the surface.- superior quality thermal degreasing the metal surface before sandblasting.- improved in-process technology, which ensure high quality degreasing the metal surface.- reduced energy consumption and metal consumption in connection with the use of finished products, the coating which improves performance.Manufactured factory party tableware business, formerly in use, to Cipriano PTFE. The results of extensive testing, which was subjected to the household utensils according to GOST 17151-81 positive, which allows to consider the proposal the applicant meets the criterion "industrial applicability". The proposed method of restoring the surface of the cookware has found a practical and widespread use, in Moscow.Authors conducted a search of patents and scientific and technical sources did not reveal analogues method, characterized by a set of signs identical in its properties and the achieved result, which allows to consider the proposal of the applicant to the appropriate criterion of "inventive step".The essence of the invention.When heat-treated by a known method at a temperature of 430-530oWith the observed self-heating of the surface as a result of combustion of organic sediments, the temperature quickly rises to 800oWith and is melting the surface of household utensils.Experimentally it was found that thermal degreasing should be a two-stage roasting: the first stage at a temperature of 410-430oC for 10-15 min and the second stage at a temperature of 460-480oC for 10-15 minutes
1. USSR author's certificate 1301869, class C 23 D 13/02, 1987.2. The application for the invention of the Russian Federation 2002101170, C 23 D 13/00, from 21.01.02, prototype. The method of applying a protective coating on the metal surface in contact with food products, including sandblasting, coating PTFE composition, followed by heat treatment, characterized in that before sandblasting produce two firing: the first at a temperature of 410-430oC for 10-15 min, the second at a temperature of 460-480oC for 10-15 minutes
FIELD: processes for applying fluent materials to surfaces to obtain anti-friction surface with the purpose to reduce hydraulic and aerodynamic friction of vehicle moving in liquid and to reduce friction in friction assemblies of machines and mechanisms working in aqueous medium.
SUBSTANCE: method involves obtaining and applying antifriction coating on vehicle body so that specific coating surface energy along liquid streamlines (streamline surface) has negative gradient.
EFFECT: reduced friction due to provision of friction resistance control.
FIELD: processes to apply liquid or fluent material to obtain an anti-friction or anti-adhesive surface, particularly to produce siliconized wrapping paper.
SUBSTANCE: method involves mixing organopolysiloxanes-based silicone composition components; applying the obtained composition on movable paper substrate; heat-treating the obtained coating up to full coating hardening. Above paper substrate is wet-strength paper web with 6-8% moisture content. The paper is preliminary subjected to calendaring operation to obtain 1.0-1.1 g/cm3 density and 250-400 sec. smoothness. Silicone composition is applied by doctoring method, wherein silicone composition from local bath is applied on paper web moving between doctor blade and rear support. At least part of rear support surface in contact area between doctor blade and rear support is resilient. Degree of paper web bending during doctor blade introduction in the rear support is regulated by change in rear support surface resiliency. Unit for silicone composition application comprises doctor and rear support having changeable resiliency at least in contact area between rear support and doctor blade. Doctor blade is installed at acute angle to line perpendicular to rear support base and passing through contact line between rear support and doctor blade. Local bath is arranged in space defined by doctor blade and paper web.
EFFECT: increased application properties and strength of the paper, provision of reliable peeling force to paper separation from adhesive layer within wide temperature range, increased quality of composition application due to increased fullness of composition introduction in surface layer of paper web.
13 cl, 2 dwg
SUBSTANCE: method comprises securing means of the anchor fastening to the surface, applying the lining material on the surface, solidifying the lining, AND drying the lining at a temperature sufficient to the melting of the coating at the means of anchor fastening. The device for anchor fastening is proposed.
EFFECT: enhanced reliability.
16 cl, 1 tbl, 3 ex
FIELD: machine engineering, namely modification of rubbing surfaces of kinematic pairs.
SUBSTANCE: method comprises steps of placing between rubbing surfaces disintegrated mineral composition containing synthetic modification of serpentine produced by diluting in water mixture of α-quartz and magnesium hydroxide at temperature 120 - 170°C and pressure 1.2 - 15.0 at for further formation of crystals. Chrysotile having monocline syngony with coordination numbers 5.0< a< 7.3A°, 9.0<b< 9.2A°, 7.0<c< 7.3A° and with angles β between positive directions of crystallographic axes 90° or 93° is used as seed for producing crystal of synthetic modification of serpentine. Summed value of molar masses of α-quartz and magnesium hydroxide corresponds to molar mass of synthetic modification of serpentine. Composition includes in addition homologs of fullerenes Cm where m ≥ 60 at next relation of components, mass %: synthetic modification of serpentine, 70 - 90; homologs of fullerenes Cm, 10 - 30. Invention allows to form coating with receive friction factor lowered to 0.001, increased hardness HRC 90 - 95.
EFFECT: enhanced wear resistance, increased useful life period of coating, possibility for realizing method with use of oil lubricant and also without any lubricant.
FIELD: anti-adhesion materials.
SUBSTANCE: invention relates to a composition comprising 0.1-4% of mixture of perfluoropolyoxaalkylene carboxylic acids of the general formula: wherein n = 3-50. For preparing colloidal solution of perfluoropolyoxaalkylene acid the composition comprises additionally 1-2% of amidoalcohol of the general formula: wherein n = 0 or 1; m = 1 at q = 1 and m = 2 at q = 0 that is prepared by interaction of dimer and/or trimer of hexafluoropropylene oxide with mono- and/or diethanolamine and water, up to 100. After treatment with the proposed composition surface of solid bodies acquires water-oil-repelling properties and the gluing seam rupture strength is reduced by two orders that accords with strength levels providing by the nearest analog representing a mixture of perfluoropolyoxaalkylene acids in coolants. Invention can be used for decreasing adherence of moldable plastic, crude rubber articles and other polymers to a tool and press-forms.
EFFECT: improved and valuable technical properties of composition.
1 tbl, 2 ex
SUBSTANCE: contamination protector contains fine particles of nitrogen dioxide, aqueous solvent containing alcohol dispersing specified particles of nitrogen dioxide, surface-active substance and splash modifier chosen among alkali metal compound, alkaline-earth metal compound, phosphorus compound, clay mineral and mixtures thereof. Specified contamination protector enters into the composition of specified aqueous solvent. It can be applied onto building board coating.
EFFECT: contamination protector and its adhesion to building board coating are enhanced.
3 cl, 30 dwg, 3 tbl, 30 ex
SUBSTANCE: antifriction coat can be used in gear pumps for reducing friction and wear resulted from corrosion or mechanical effects in tribojoints under effects of chemically active reagents, high temperature and loads on engaged parts to ensure required stable gaps between the said parts. The antifriction coat consists of three layers, i.e. inner, intermediate and upper layers. Note here that the inner layer represents a composition comprising 90 wt % of a polyimide varnish and 10 wt % of chromophosphatealuminic bond, the intermediate layer being made from 100 wt % of a pure polyimide varnish. Finally, the top layer represents a composition containing 90 wt % of polyimide varnish, 8 wt % of colloid graphite and 2 wt % of lecithin. Thickness of the aforesaid inner layer is within the limits of from 8 up to 10 mcm, thickness of the intermediate layer is within the limits of from 16 up to 20 mcm, thickness of the top layer is within the limits of from 24 up to 30 mcm, while the required thickness of the coat is provided by grinding the top layer.
EFFECT: longer life of friction assembly units and parts operated in chemically active environments.
FIELD: personal utensils.
SUBSTANCE: nonstick coating consists of, at least, one first primary layer spread over the base and covered with one or more upper layers on the bases of fluorocarbon resins. Primary layer includes, in the ratio of dry components weight to total composition from 9 to 15 wt %, fluorocarbon resin, from 4 to 5 wt %, polyamidoimidic resin (PAI), from 0.12 to 1.1 wt %, polyether ether keton resin (PEEK), and residual consisting of technological supplements, inert fillers and dispersion media.
EFFECT: invention secures better resistance of the nonstick coating to scratching due to reduced weight content of PEEK in the composition of the first basic layer.
9 cl, 2 tbl
FIELD: technological processes.
SUBSTANCE: this invention is related to structure including substrate and tempered anti-adhesion coating on substrate. Such coating includes lower coating and upper fluoropolymer coating, in which mentioned lower coat comprises magnetic scales and multiple silicon carbide particles.
EFFECT: development of coat with improved heat transfer properties, improved resistance to abrasion and proper slipping.
16 tbl, 4 ex
FIELD: technological processes.
SUBSTANCE: invention may be used for coating of kitchen ware, impregnation of nonwoven or woven materials, for instance glass tissue, for coating of paper or polymer substrates. In method for coating by fluoropolymer dispersion, substrate surface is characterised by layer of fluoropolymer. In this method water dispersion is used, which contains the following components: particles of fluoropolymer processed in melt in amount from 30 to 70 wt %. Moreover, fluoridised surfactant is used in amount of not more than 250 ppm, based on content of hard fluoropolymer in specified water dispersion; and nonionic surfactant containing ethoxylated aliphatic alcohol, in amount from 2 to 15 wt %, based on common content of dry substance in specified water dispersion. Specified water dispersion does not contain or practically does not contain nonionic surfactants, containing aromatic groups. In order to prepare tiling composition, specified water dispersion may optionally be diluted and/or mixed with additional components. Then specified tiling composition may be applied at least on part of surface to produce fluoropolymer layer.
EFFECT: production of tiling composition with proper wetting ability and film-forming properties.
7 cl, 2 ex
FIELD: mechanical engineering, restoration of machine parts.
SUBSTANCE: method is realized by applying at least one coating by means of electric spark alloying. Wear resistance coating is applied with use of electrode of boron alloyed intermetallide Ni3Al containing, mass %: Al, 2 - 15; B, 0.02 - 02; Ni, the balance. In variants of invention electrode contains in addition dispersed particles of Si3 N4. Before applying on part layer of wear resistant coating, nickel layer with thickness 20 - 50 micrometers is applied as intermediate adhesion barrier. Coated parts are subjected to mechanical working. Restoration is realized for parts with wear degree up to 100 micrometers or with wear degree 100 - 300 micrometers.
EFFECT: possibility for restoring parts, improving their wear resistance and increasing adhesion strength of applied coating with base material of part.
6 cl, 3 tbl, 3 ex
FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.
SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.
EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.
14 cl, 6 dwg, 3 ex