Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
  • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost

Definitions

• the present invention is related to a method for preparing a coating material which prevents water accumulation and ice formation on the refrigerator evaporators and condensers consisting of aluminium folios, while operating; and which provides the creation of a humidity resistant surface.
• the coating technologies consist of important techniques that have a wide spread implementation area in the field of the material science, in recent years.
• the major objective is the production of a material of a superior quality with higher positive values, by coating all kinds of surfaces with varying thicknesses of the material.
• the sol-gel technology is employed significantly due to its various advantages, and the superior physical, mechanical and chemical properties it provides to the coated material and such qualities as extending the service life of the material.
• the sol-gel technology consists of applying a combination of organic polymeric components and oxide or non-oxide inorganic ceramic material and/or a composite mixture formed by organic modified non-metallic compounds. These techniques are designed, considering the function of the coating, by utilising different properties of organic and inorganic material, and are applied with suitable combinations to suitable processes. In this method, reaction is realized in water or in an organic solvent medium.
• a colloidal solution (SOL) containing particules of nanometric (run) dimensions, as the result of reaction and process, is translated into the position of a di-phase gel (GEL).
• SOL colloidal solution
• An inorganic polymeric net is formed by the hydrolysis and condensation reactions of the hydrolyzable compounds such as metal alkoxides.
• a part of the hydrolyzable groups may be replaced by non-hydrolyzable and non-modified groups during the sol-gel process.
• organo-substituted alkoxysilans consisting of silicon-carbon bond formed by non-functional organic groups or by functional groups giving polycondensation, polyaddition and addition reactions, are used.
• organic groups have two important functions:
• Organic groups modify the inorganic net by transferring their own characteristics to the inorganic net, b) By polymerization they constitute an organic polymeric net in addition to the inorganic net.
• the complementary properties of organic and inorganic phases form a composite layer on the surface, for instance, a combination of such properties as flexibility, resistance to corrosion, to scratching, to abrasion etc.
• the sol-gel technique is the technique of forming an organic net (mesh) by hydrolysis and condensation reactions of organic modified alkoxy compounds or by various methods.
• metallic surfaces are provided with hydrophilic or hydrophobic characteristics and at the same time their corrosion resistance is increased and additionally it is being used in various industrial applications for the last 5 years.
• polymeric materials used in the automotive sector, organic eye glasses (anti-scratch), plexyglass material (anti-scratch) may be given as examples.
• the object of the present invention is to realize a method for developing a moisture- and corrosion-resistant, composite coating with hydrophilic or hydrophobic characteristics that prevents water accumulation and ice-formation on the evaporators and condensers made of aluminium folios in the refrigerators, during operation by using the sol-gel technique.
• the wetting angle between the water droplet and the aluminium folio is designed to be between 10° to 20° on hydrophobic surfaces and 90°- 110° on hydrophobic surfaces and accordingly, solutions of appropriate chemical formulations and composition have been prepared.
• GPTS (3-Glycidoxypropyltrimethoxysilan) Formula : CH 2 -CH- CH 2 -O- CH 2 CH 2 CH 2 Si(OCH 3 ) 3
• GL YEO (3 - Glycidoxypropyltriethoxysilan) Formula: CH 2 -CH- CH 2 -OCH 2 CH 2 CH 2 Si(OC 2 H 5 ) 3
• Amines 1 3 -Ammopropyltrimethoxysilan (AMEO) H 2 NCH 2 CH 2 CH 2 Si (OCH 3 ) 3
• TPSA Triethoxysilylpropylsuccinicanhydride
• the GPTS BPA/Mi7AMEO mixture is prepared so that the molar ratios are respectively 100/1-60/5-20/5-20. After the hydrolysis of GPTS, BPA and Ml are added and stirred for 30 minutes. 4% Brij96 and 6% TSPSA+Brij96 (1:1 mol) are added to the mixture and stirred 30 minutes.
• the aluminium folio surfaces to be coated are cleaned following the below given order: Degreasing; washing with distilled water; neutralization by HNO3; washing with distilled water; washing with alcohol and drying.
• the cleaned aluminium folio surfaces are coated by immersing in the prepared solution or by spraying.
• the coated surfaces are kept in the drying oven at 120°C for 30 minutes or at 150°C for 5 minutes in order to obtain the required hardening.
• Experiment 2 It is prepared by adding 4% Brij96 and 7% TSPSA+Brij96 (1:1 mol) to the mixture of Experiment 1.
• Another embodiment of a coated evaporator has been mounted on an open system refrigerator and the condensation and evaporation stages have been recorded by a video camera. The same procedure is repeated with an uncoated evaporator and it has been observed that in the coated embodiment, the water drops slipped away on the surface without ice-formation, due to the hydrophobic characteristic of the surface. Whereas in the uncoated embodiment, water drops remained on the surface during the condensation stage and they accumulated as ice particles.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)
• Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 1999
  • 1999-07-28 TR TR2000/03680T patent/TR200003680T2/xx unknown
  • 1999-07-28 WO PCT/TR1999/000038 patent/WO2000006958A2/en not_active Application Discontinuation
  • 1999-07-28 AU AU63809/99A patent/AU6380999A/en not_active Abandoned
  • 1999-07-28 EP EP99951355A patent/EP1101072A1/de not_active Withdrawn

Non-Patent Citations (1)

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