JP2010076166A - Lubricating member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating member in which flowability of oil is enhanced, the oil attached on a surface of the lubricating member is flowed without remaining there when a range hood is formed from the lubricating member, and a recovery rate of the oil is enhanced, especially the recovery rate of the oil is not deteriorated even when a catch panel with a low inclination is used in the range hood. <P>SOLUTION: The lubricating member is formed by providing a surface of a base material 2 with a coating film 1 having a lubricating angle to oleic acid of ≤20°. The coating film is formed from a fluorine resin having a dimethyl silicon group and hydroxy group, and an amino resin or isocyanate compound. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil-lubricating member applied to a range hood or the like.

  The range hood is the most oily thing to accumulate in the kitchen, and it is a hard device to clean. Some range hoods have traditionally consisted of a filter that catches oil and a fan that has the ability to suck in. In recent years, filter-less structures that do not use filters with improved careability are on the market. Has been introduced. As shown in FIGS. 3 (a) and 3 (b), the filter type is a type in which oil vapor is passed through the filter 10 by rotation of the fan 11, the oil is caught in the mesh, and the adhered oil is recovered. is there. In the filterless type, as shown in FIGS. 4 (a) and 4 (b), the oil adhering to the rectifying plate 20, the catch panel 21 and the fan 22 is condensed, and the oil catch (recovery port) 23 Are collected and removed periodically. In recent years, filterless type range hoods have increased due to maintenance.

  As shown above, the filterless type range hood generally has a mechanism in which the oil adhering to the catch panel 21 installed on the rectifying plate 20 is condensed and recovered with fluidity of the oil. There is also a mechanism in which oil that does not have the catch panel 21 and adheres to the fan 22 is blown off by centrifugal force and collected. Here, it is important that the oil adhering to the catch panel 21, the fan 22, and the peripheral members has fluidity until reaching the oil catch 23, and the oil accumulates on the way to the oil catch 23. If the oil is left as it is and attached to the surroundings, the oil undergoes an oxidative polymerization reaction due to oxygen in the air and the like, and the viscosity gradually increases, which adversely affects the maintenance. Therefore, it is desired to develop a system that can efficiently collect and clean the oil adhering to the catch panel 21, the fan 22, and the peripheral members until the oil reaches the oil catch 23.

  For example, Patent Document 1 describes an improved range hood recovery rate by providing an inclined surface or changing the arrangement of the recovery port. However, the one described in Patent Document 1 does not improve the recovery rate by installing an oil retaining property on the surface. Moreover, although the thing which reduces the effort of the filter cleaning with a watering equipment is proposed (refer patent documents 2, 3), there exists a possibility that a range hood may become complicated by providing watering equipment.

As shown in these prior arts, there are proposals for improving the recovery rate and the cleanability by a system such as a mechanism inside the range hood and a cleaning device, but none of the oily surface material improves the recoverability and the cleanability. The most suitable surface design for a member for forming a range hood to be collected in such an oil catch is that the oil attached to the surface has fluidity, that is, a low lubrication surface material that is easy to roll oil even at a small inclination angle. It is desired. In addition, Patent Document 4 proposes that a fluororesin excellent in water repellency and oil repellency can be applied to a wide range of substrates such as a range hood, but does not mention oil slipperiness.
JP 2001-133003 A JP 2007-163209 A JP 2007-162979 A Japanese Patent Laid-Open No. 9-72256

  This invention is made | formed in view of said point, and it aims at providing the oil-sliding member which can improve the fluidity | liquidity of oil.

  The oil-lubricating member according to claim 1 of the present invention is characterized in that the surface of the base material 2 is provided with the coating 1 having a lubricating angle with respect to oleic acid of 20 ° or less.

  The oil-lubricating member according to claim 2 of the present invention is characterized in that, in claim 1, the difference between the advancing angle and the receding angle of oleic acid on the coating 1 is 0 to 10 °.

  The oil-lubricating member according to claim 3 of the present invention is the oil-lubricating member according to claim 1 or 2, wherein the coating 1 is formed of a fluororesin having a dimethylsilicon group and a hydroxyl group, and an amino resin or an isocyanate compound. It is a feature.

  The oil-lubricating member according to claim 4 of the present invention is the oil-lubricating member according to any one of claims 1 to 3, wherein the coating 1 contains an acrylic resin having a Tg of 40 to 100 ° C. and containing a hydroxyl group. It is characterized by this.

  In the first aspect of the present invention, the oil having a lubricating angle with respect to oleic acid, which is the main component of the oil, is 20 ° or less, so that the fluidity of the oil attached to the surface can be improved. Therefore, when a range hood is formed with the oil-lubricating member in the present invention, the oil adhered to the surface of the oil-lubricating member can flow without staying, and the oil recovery rate can be improved. . In particular, even in a range hood using a catch panel with a low inclination, the oil recoverability can be prevented from being lowered.

  In the invention of claim 2, since the difference between the advancing angle and the receding angle of oleic acid on the coating is 0 to 10 °, the fluidity of the oil adhered to the surface can be enhanced.

  In the invention of claim 3, the oil repellency of the coating can be enhanced by the dimethyl silicon group, and the fluidity of the oil adhered to the surface can be enhanced. Moreover, since an amino resin or an isocyanate compound is contained, the curability of the film can be increased.

  In the invention of claim 4, the stain resistance of the coating can be improved by the acrylic resin. Further, since the Tg of the acrylic resin is 100 ° C. or lower, the coating film can be prevented from becoming brittle, and deterioration of the coating film can be suppressed. Also, if the Tg of the acrylic resin is 40 ° C. or higher, the surface hardness of the coating film is increased, the wear resistance is improved, the resistance to scratches is improved, and the scratches are difficult to enter, so that the gaps are stained. Contamination is improved by making it difficult to accumulate. In addition, by using a high resin as an auxiliary matrix compared to the case of combining with a resin having a low Tg, the silicon group in the fluororesin is fixed on the surface, the oil slipping property is further improved, and the oil accumulation is increased. The contamination resistance is improved by decreasing the amount.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The oil-lubricating member of the present invention is formed by providing the coating 1 having a lubricating angle with respect to oleic acid of 20 ° or less on the surface of the substrate 2. Here, the oil lubrication angle is a falling angle α as shown in FIG. 1 and is an inclination angle at which the oleic acid droplet (oil ball) O on the coating 1 starts to fall. The smaller the falling angle α, the better the lubricity. Therefore, when the oil lubrication angle with respect to oleic acid is larger than 20 °, the fluidity of the oil is lowered and the oil lubricity is lowered, and when used in a range hood or the like, the attached oil may stay and the recovery rate may be lowered. There is.

  Further, in order to reduce the sliding angle α as described above and the surface of the film 1 exhibits high oil lubricity, the difference between the forward and backward angles of the oleic acid droplet O on the film 1 with respect to the surface of the film 1 is It is preferably within the range of 0 to 10 °. In general, when an oil droplet O is dropped on an inclined slope, as shown in FIG. 2, the droplet O slides down with a curved surface, and the contact angle of the front droplet O in the traveling direction is the forward angle. (Advance contact angle) θa, and the contact angle of the rear droplet O becomes the receding angle (receding contact angle) θr. Usually, since the droplet O on the inclined surface is affected by a certain gravity, the forward contact angle θa is larger than the backward contact angle θr. The smaller receding angle θr means that there is adhesion at the contact interface between the droplet O and the coating 1, and the smaller the receding angle θr is, the closer the receding angle θr is to the advancing angle θa, the more the droplet O becomes. It is easy to slide down, and the sliding angle α becomes small and the sliding property becomes high. For this reason, if the difference between the advance angle θa and the receding angle θr is in the range of 0 to 10 °, it indicates high lubricating oil, and the difference between the advancing angle θa and the receding angle θr exceeds 10 °. Makes it difficult to instantaneously roll and discharge the droplets O on the surface.

  The coating 1 as described above is a coating formed from a fluororesin having a dimethylsilicon group and a hydroxyl group, and an amino resin or an isocyanate compound.

  A fluororesin having a dimethylsilicon group and a hydroxyl group can be synthesized by reacting a fluororesin having a dimethylsilicon group bonded to a side chain with a hydroxyl group-containing radical polymerizable monomer.

  A fluororesin having a dimethylsilicon group bonded to the side chain is represented by the following general formula (1).

  Here, in the formula (1), n represents an integer of 2 or more and 250 or less, and X represents a main chain fluororesin skeleton. Therefore, the dimethylsilicon group is represented by a portion other than X in the formula (1), and means a side chain (terminal is a methyl group) of dimethylpolysiloxane. This functional group can be introduced into the skeleton of the fluororesin by using reactive silicone monomers as shown in the following formulas (2) to (6). Since the dimethylsilicon group is present in the free matrix in the polymer matrix, it is oriented in the surface rather than the main skeleton of the molecule and has a surface structure with extremely low slip resistance. It is possible to design a coating that reduces the falling angle α of the oil adhering to. In addition, said "free" means that it is a side chain group hanging from the main chain in this resin, and the side chain group reacts the resin with a curing agent to cause three-dimensional crosslinking. Can move flexibly within the molecule. In this case, since a dimethylsilicon group having a low surface tension is used for the side chain, it is oriented on the surface layer of the coating film and contributes to oil slidability. The oil-repellent free side chain includes a fluorine side chain such as a fluoroolefin group. In the present invention, a dimethylsilicon group is preferable. The functional group that repels oil can be broadly divided into fluorine and silicon. However, when fluorine is used for the side chain, the oil contact angle increases, but the sliding angle is also high, as in the present invention. It may be unsuitable for applications where the sliding angle against oil is low. On the other hand, the dimethyl silicon group has a lower oil contact angle than that of the fluorine type, but has a sliding angle lower than that of the fluorine type, and is suitable for use in the present invention. Such a dimethylsilicon group is not only added to the paint, but also introduced into the main skeleton of the fluororesin. Excellent. Various methods for introducing a dimethylsilicon group into the main skeleton are conceivable, but this can be achieved by reacting a dimethylsilicon having an unsaturated group at the terminal as shown below with a fluororesin. Below, the material of the dimethyl silicon which can be used by this invention is shown.

One-end dimethylsilicone terminated with a methacrylate group
CH ₂ = C (CH ₃ ) -COO-C ₃ H ₆ -Si (CH ₃ ) _2- (O-Si (CH ₃ ) ₂ ) _p -R ₂ (2)
(R ₂ represents an alkyl group having 1 to 6 carbon atoms. P is an integer of 1 to 250)
One-terminal dimethylsilicone with terminal acrylate groups
CH ₂ = C (CH ₃ ) -COO-C ₃ H ₆ -Si (CH ₃ ) _2- (O-Si (CH ₃ ) ₂ ) _q -R ₃ (3)
(R ₃ represents an alkyl group having 1 to 6 carbon atoms. Q is an integer of 1 to 250)
Both end dimethyl silicon whose both ends are represented by acrylate or methacrylate groups
R ₄ ―C ₃ H ₆ -Si (CH ₃ ) _2- (O-Si (CH ₃ ) ₂ ) _r ―R ₄ (4)
(R4 _{are, -OOC (CH 3) C =} CH 2 or -OOCHC = CH _2, r is an integer of 1 to 250)
Dimethyl silicon without ester bond
CH ₂ = CH-Si (CH ₃ ) _2- (O-Si (CH ₃ ) ₂ ) _s -R ₅ (5)
(R5 represents an alkyl group having 1 to 6 carbon atoms or —CH═CH ₂ s is an integer of 1 to 250)
By synthesizing the monomers represented by these formulas (2) to (5) with radically polymerizable monomers such as radically polymerizable fluoroolefin compounds, acrylate compounds, and methacrylate compounds, a fluororesin having a dimethylsilicon group introduced therein is synthesized. It becomes possible to do. The radically polymerizable fluoroolefin compound has, for example, a monomer structure represented by the following formula (6). By radical polymerization, a fluorine group or the like can be introduced into the main chain molecule.

In formula (6), X is F or H, Y is H, Cl, F, CF ₃ . Fluorine group is superior in chemical resistance, weather resistance, and water repellency, so it can form a coating structure with excellent oil repellency in the long term by interacting with the dimethylsilicon group in the side chain. Become. For example, even if the dimethylsilicon group in the side chain is dropped due to some influence, the oil repellency is further maintained by the presence of the fluorine compound in the main skeleton.

  In addition, it is necessary to introduce a hydroxyl group to react with an isocyanate compound or the like in the fluororesin used in the present invention. Hydroxyl groups can be introduced, for example, by using radically polymerizable monomers that hold a hydroxyl group-containing vinyl ether group as shown below. The hydroxyl group-containing unsaturated monomer is not particularly limited. For example, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, Plaxel FM1 (ε-caprolactone-modified hydroxyethyl methacrylate, manufactured by Daicel Chemical Industries), polyethylene glycol Examples thereof include monoacrylate or monomethacrylate, polypropylene glycol monoacrylate or monomethacrylate. In addition, the other monomer other than the hydroxyl group-containing unsaturated monomer is not particularly limited, and examples thereof include carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, and maleic acid. Further, as other unsaturated monomers, for example, acrylic acid or methacrylic acid ester group-containing acrylic monomers such as methyl, ethyl, propyl, butyl, hexyl, ethylhexyl, lauryl; vinyl alcohol and acetic acid, propionic acid, etc. Vinyl alcohol ester monomers with carboxylic acid; unsaturated hydrocarbon monomers such as styrene, α-methylstyrene, vinyl naphthalene, butadiene and isoprene; nitrile monomers such as acrylonitrile and methacrylonitrile; acrylamide Acrylamide monomers such as methacrylamide, N-methylolacrylamide, N, N-dimethylacrylamide and diacetoneacrylamide may be copolymerized.

  The coating film 1 used in the present invention can bring out more excellent lubricating properties by reacting the fluororesin having the dimethylsilicon group and the hydroxyl group with a curing agent. As the curing agent, either an amino resin or an isocyanate compound (resin) is preferably used.

  First, the case where an amino resin is used as a curing agent (crosslinking agent) will be described. Although there are various types of amino resins, melamine resins are preferred. There are various types of melamine resins, but they are roughly classified into butylated melamine resins, methylated melamine resins and methyl-butyl mixed alkylated resins. Methylated melamine resins are classified into fully alkyl type, imino type, methylol type, and methylol / imino type. The complete alkyl type does not react unless the external catalyst is added and the reactivity with the hydroxyl group of the main agent is low and the temperature is not high. However, when the catalyst is added, the reactivity with the main resin is higher than that of other melamine resins. In general, it is said that melamine resin not only reacts with the main agent but also has a self-condensation property, but this type of melamine resin has a low self-condensation property and thus reacts well with the main agent in the presence of a catalyst. The imino melamine resin and methylol melamine resin react at a relatively low temperature even without an external catalyst. However, since the self-condensability is higher than that of the methylated melamine resin, there is a demerit that the reaction with the main agent becomes poor. In the case of a methylol / imino melamine resin, it has both methylol / imino reactivity and represents an intermediate property.

  In the present invention, a curing catalyst can be added for the purpose of promoting the curing. Examples of the curing catalyst include strong acids and neutralized products of strong acids such as P-toluenesulfonic acid, dodecylbenzenesulfonic acid, dinonylnaphthalenesulfonic acid, dinonylnaphthalenedisulfonic acid, xylenesulfonic acid, cumenesulfonic acid and the like. Examples thereof include sulfonic acid compounds which are strong acids, neutralized amines of these sulfonic acid compounds, phosphoric acid and phosphoric acid compounds. In the present invention, when a methylated melamine resin having no self-condensability and excellent reactivity with a hydroxyl group of the main agent (fluororesin) is combined with the above catalyst, a very good oil lubrication angle is exhibited. The addition amount of the melamine resin is preferably 10 to 50%, more preferably 15 to 40%, based on the solid content of the fluororesin (water repellent resin). . Moreover, when there is little addition amount of the acid which is a curing catalyst, a coating film with a low crosslinking density will be obtained, and when too much, it will become a brittle coating film. The addition amount of the acid is preferably in the range of 0.1 to 1.0% in the coating composition.

  Next, the case where an isocyanate compound is used as a curing agent (crosslinking agent) will be described. Examples of the isocyanate compound include aliphatic diisocyanates such as lysine diisocyanate, hexamethylene diisocyanate, and trimethylhexane diisocyanate; hydrogenated xylylene diisocyanate, isophorone diisocyanate, methylcyclohexane-2,4 (or 2,6) -diisocyanate, 4, Cyclic aliphatic diisocyanates such as 4'-methylenebis (cyclohexyl isocyanate) and 1,3- (isocyanatomethyl) cyclohexane; aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate and diphenylmethane diisocyanate; lysine triisocyanate Organic polyisocyanates such as polyisocyanates having a valence of 3 or more such as a net, or each of these organic polyisocyanates. Isocyanate and polyhydric alcohol, an adduct of low molecular weight polyester resin or water, etc., or cyclic polymer of the organic diisocyanate comrades such described above (e.g., isocyanurates), and the like biuret type adducts. Among these, hexamethylene diisocyanate isocyanurate is preferable. These may be used alone or in combination of two or more.

  The amount of the polyisocyanate compound used is generally 0.2-2. The isocyanate group (NCO) contained therein is an equivalent ratio of NCO / OH to the hydroxyl group (OH) in the fluororesin. It is appropriate to select it within the range of 0, preferably 0.5 to 1.5.

  In the present invention, an organosilicate or a catalyst can be used as a component for improving the adhesion, and it is preferable to add a part of an alcohol solvent as the parent solvent. Usually, since an isocyanate compound reacts with a hydroxyl group contained in alcohol, a blocked isocyanate compound in which the isocyanate group is blocked with a blocking agent and the blocking agent dissociates when heated can be suitably used. The blocking agent is an active hydrogen compound, and examples thereof include ketoxime derivatives, lactam derivatives, etc. In addition, phenol, active methylene, alcohol, mercaptan, acid amide, imide, imidazole, urea, Derivatives of compounds such as carbamate can be mentioned. Specific examples thereof include the following.

  Ketooxime derivatives: methyl ethyl ketone oxime, butanone oxime, formamide oxime, acetamide oxime, acetone oxime, methyl isobutyl ketone oxime, methyl amyl ketone oxime, diacetyl monooxime, benzophenone oxime, cyclohexanone oxime, methyl hexanone oxime, etc.

-Lactam derivatives: ε-caprolactam, δ-caprolactam, β-butyrolactam, β-propiolactam and the like.
Phenol derivatives: phenol, cresol, xylenol, ethylphenol, nonylphenol, isopropylphenol, p-tert-butylphenol, thymol, p-nitrophenol, p-naphthol, p-chlorophenol, p-tert-octylphenol and the like.

Active methylene derivatives: ethyl acetoacetate, diethyl malonate, methyl acetoacetate, dimethyl malonate, acetylacetone, etc.
Alcohol derivatives: methanol, ethanol, propanol, isopropanol, 2-ethylhexanol and the like.
Mercaptan derivatives: butyl mercaptan, t-dodecyl mercaptan, thiophenol and the like.

Acid amide derivatives: acetanilide, acetanisidide, acetic acid amide, acrylamide, benzamide and the like.
Imide derivatives: succinimide, maleic imide and the like.
Imidazole derivatives: 2-phenylimidazoline, imidazole, pyrazole, triazole and the like.

-Urea derivatives: urea, thiourea, ethylene urea, diphenyl urea and the like.
Carbamate derivatives: phenyl N-phenylcarbamate, 2-oxazolidone and the like.

  Moreover, in this invention, an acrylic resin can be mixed suitably in resin and contamination resistance can be improved. It is particularly preferable that the acrylic resin to be mixed has a Tg (glass transition point) in the range of 40 ° C to 100 ° C. More preferably, it is in the range of 50 ° C. to 90 ° C., more preferably 70 ° C. to 90 ° C., and Tg is preferably as high as possible. Tg of 100 ° C. or higher is not preferable because the physical properties of the resin become brittle and the physical properties of the coating 1 tend to be inferior. Usually, in order to increase the Tg of an acrylic resin, it can be prepared by polymerizing an acrylic monomer having a cyclo ring or a benzene ring as a skeleton. Since the acrylic resin having such a bulky structure does not easily allow contaminants such as oil to penetrate into the inside of the coating film, the contamination resistance of the coating film 1 containing the fluororesin described above can be improved. When adding an acrylic resin, the range of 30-90 mass% is preferable by solid content ratio with a fluororesin. More preferably, it is added in the range of 50 to 80% by mass. If the amount of the acrylic resin is too much, the effect of sliding and oil repellency of the fluororesin to be added is hindered, so that a sufficient effect cannot be obtained. Moreover, since there will be only the characteristic of a fluororesin when there is too little acrylic resin, it exists in the tendency for sliding property to be inferior.

In the present invention, when the coating 1 is formed, a fluorine resin having a dimethylsilicon group and a hydroxyl group, a curing agent made of an amino resin or an isocyanate compound, and, if necessary, an acrylic resin or a catalyst are blended in predetermined amounts. The coating film 1 can be formed on the surface of the substrate 2 by dissolving it in a solvent to prepare a coating material, applying the coating material to the surface of the substrate 2 and then curing the coating material. Here, the solvent is not particularly limited, but examples thereof include lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol, and isobutanol; ethylene glycol, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, and the like. And ethylene glycol derivatives; diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether; and toluene, xylene, hexane, heptane, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methyl ethyl ketoxime, diacetone alcohol, and the like. can be used can be used alone or two or more kinds selected from the group consisting. The amount of the solvent used can be appropriately set according to the ease of application of the paint. When an isocyanate compound is used, it is preferable to avoid the use of alcohols as much as possible because they react.

In the present invention, the substrate 2 can be made of various materials, such as ABS (acrylonitrile, butadiene, styrene polymerization synthetic resin), PP (polypropylene), PC (polycarbonate) and the like, acrylic, Examples thereof include a plastic substrate formed of a thermosetting resin such as FRP, a metal substrate formed of a steel material, an aluminum material, a stainless steel material, a hot dip galvanized steel plate, or the like. The shape of the base material 2 is not specifically limited, For example, it can form in plate shape etc. In applying the coating material for forming the coating 1 to the surface of the substrate 2, known means such as spray coating can be used. The coating amount of the paint can be set to 110 to 100 / m ² as a wet weight. Moreover, after apply | coating a coating material to the surface of the base material 2, it can be made to harden by drying at the temperature of normal temperature -180 degreeC for 10 to 60 minutes. Moreover, the film thickness of the film 1 after drying and curing can be set to 5 to 50 μm.

  Hereinafter, the present invention will be described specifically by way of examples. “Parts” are all parts by mass.

Example 1
As a fluororesin containing a dimethylsilicon group and a hydroxyl group, “KD-270R” (manufactured by Kanto Denka Co., Ltd., solid content (NV) 30%, hydroxyl value (OH value) 105) as a melamine resin as a crosslinking agent, Nine parts of “Cymel 303” (manufactured by Nippon Cytec Co., Ltd., methylated melamine resin, solid content (NV) 98%) was mixed, and 0.5% of catalyst 6000 (manufactured by Mitsui Chemicals, Ltd., acid catalyst) was used as a curing catalyst. 100 parts of butyl acetate was added as a diluent solvent and mixed well. This solution (paint) was applied to the surface of the substrate by air spray at a wet weight of 30 g / m ² . As the substrate, a metal plate (stainless steel plate) formed of SUS304 having a size of 150 cm × 70 cm was used. Thereafter, the coated substrate was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film made of an oil-repellent coating film on the surface of the substrate. The oil-lubricating angle of this oil-lubricating member with respect to oleic acid was 8 °, and the difference in contact angle between forward and backward was 5 °.

  The oil angle of oleic acid is projected on a personal computer using a sliding method using a dynamic contact angle measuring device manufactured by Kyowa Interface Chemical Co., Ltd. on a horizontal plate with variable angle. The point at which the oil slipped and disappeared from the screen was measured as the oil angle. The advancing angle and the receding angle were calculated by measuring the advancing and receding angle at the angle at which the oil slips.

(Example 2)
As a fluororesin containing a dimethyl silicon group and a hydroxyl group, “ZX-022” (manufactured by Fuji Kasei Kogyo Co., Ltd., solid content (NV) 45%, hydroxyl value (OH value) 120) as a melamine resin as a crosslinking agent , “Cymer 303” (manufactured by Nippon Cytec Co., Ltd., methylated melamine resin, solid part (NV) 98%) 13.5 parts mixed, and “Catalyst 6000” (manufactured by Mitsui Chemicals, Ltd., acid catalyst) as a curing catalyst ) And 0.5 parts of butyl acetate as a diluent solvent were added and mixed well. This solution (paint) was applied to the surface of the same substrate as described above by air spray at a wet weight of 30 g / m ² . Thereafter, the coated base material was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film composed of an oil-repellent coating film on the surface of the base material. The oil-lubricating angle of this oil-lubricating member with respect to oleic acid was 10 °, and the difference in contact angle between forward and backward was 6 °.

(Example 3)
As a fluororesin containing a dimethyl silicon group and a hydroxyl group, “KD-270R” (manufactured by Kanto Denka Co., Ltd., solid content (NV) 30%, hydroxyl value (OH value) 105) is 100 parts, and an isocyanate resin as a crosslinking agent is “ 20.8 parts of “TPA-80X” (manufactured by Asahi Kasei Chemical Co., Ltd., hexamethylene diisocyanate resin, solid content (NV) 80%) was mixed, and 100 parts of butyl acetate was added as a solvent and mixed well. This solution (coating material) was applied to the surface of the same substrate as described above by air spray at a wet weight of 30 g / m ² . Thereafter, the coated substrate was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film made of an oil-repellent coating film on the surface of the substrate. The oil lubrication angle of this oil-lubricating member with respect to oleic acid was 12 °, and the difference in the contact angle between advancing and receding was 8 °.

Example 4
As an acrylic resin having a high Tg (designed Tg = 79 ° C.), “AR-3329” (manufactured by Mitsubishi Rayon Co., Ltd., solid content (NV) 50%, hydroxyl value (OH value) 43), 100 parts, dimethyl silicon As a fluorine resin containing a group and a hydroxyl group, “KD-270R” (manufactured by Kanto Denka Co., Ltd., solid content (NV) 30%, hydroxyl value (OH value) 105) is 50 parts, and as a melamine resin as a crosslinking agent, “Cymel 303 "(manufactured by Nippon Cytec Co., Ltd., methylated melamine resin, solid content (NV) 98%) is mixed with 16.3 parts, and" Catalyst 6000 "(manufactured by Mitsui Chemicals, Inc., acid catalyst) is used as the curing catalyst. .5 parts was added, and 100 parts of butyl acetate was added as a diluent solvent and mixed well. This solution (coating material) was applied to the surface of the same substrate as described above by air spray at a wet weight of 30 g / m ² . Thereafter, the coated substrate was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film made of an oil-repellent coating film on the surface of the substrate. The oil-lubricating angle of this oil-lubricating member with respect to oleic acid was 4 °, and the difference in contact angle between forward and backward was 3 °.

(Example 5)
As an acrylic resin having a high Tg (designed Tg = 79 ° C.), “AR-3329” (manufactured by Mitsubishi Rayon Co., Ltd., solid content (NV) 50%, hydroxyl value (OH value) 43), 100 parts, dimethyl silicon As a fluorine resin containing a group and a hydroxyl group, “KD-270R” (manufactured by Kanto Denka Co., Ltd., solid content (NV) 30%, hydroxyl value (OH value) 105) is 50 parts, and an isocyanate resin as a crosslinking agent is “TPA -80X "(Asahi Kasei Chemical Co., Ltd., hexamethylene diisocyanate resin, solid content (NV) 80%) was mixed, and 100 parts of butyl acetate was added and mixed well. This solution (coating material) was applied to the surface of the same substrate as described above by air spray at a wet weight of 30 g / m ² . Thereafter, the coated substrate was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film made of an oil-repellent coating film on the surface of the substrate. The oil lubrication angle of this oily member with respect to oleic acid was 18 °, and the difference in the contact angle between advance and retreat was 9 °.

(Comparative Example 1)
As a fluororesin component having no dimethyl silicon group, 50 parts of “Fluonate K-704” (manufactured by Dainippon Ink Co., Ltd., solid content (NV) 50%) and “Coronate HX” (Japan) as an isocyanate resin as a crosslinking agent 20 parts by polyurethane) and 20 parts butyl acetate and 20 parts xylene as diluent solvents were added and mixed well. This solution (paint) was applied to the surface of the same substrate as described above by air spray at a wet weight of 30 g / m ² . The coated base material 1 was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film composed of an oil-repellent coating film on the surface of the base material. The oil lubrication angle of this oil-lubricating member with respect to oleic acid was 22 °, and the difference in the contact angle between advancing and receding was 15 °.

(Comparative Example 2)
100 parts of “LR-199” (manufactured by Mitsubishi Rayon Co., Ltd., solid content (NV) 50%) as an acrylic resin, and “Cymel 303” (manufactured by Nippon Cytec Co., Ltd., methylated melamine resin, 30 parts of solid content (NV) 98%), 0.5 part of catalyst 6000 (Mitsui Chemicals, acid catalyst) is added as a curing catalyst, and 100 parts of butyl acetate is added as a diluent solvent and mixed well. did. This solution (coating material) was applied to the surface of the same substrate as described above by air spray at a wet weight of 30 g / m ² . Thereafter, the coated substrate was cured in a drying oven at 150 ° C. for 30 minutes to obtain an oil-slidable member having a film made of an oil-repellent coating film on the surface of the substrate. The oil-lubricating member had an oil-lubricating angle of 25 ° with respect to oleic acid, and the difference in contact angle between advancing and receding was 18 °.

Further, a coating having the same composition as the coatings formed in Examples 1 to 5 and Comparative Examples 1 and 2 was applied to the outer surface of the fan 22 of the range hood R manufactured by Matsushita Electric Works, the entire surface of the catch panel 21, and the rectification. It was formed on the entire surface of the plate 20 and installed. While operating the range hood R, as shown in FIG. 1, the frying pan F was heated immediately below the range hood R at a high temperature of 250 ° C., and oil and water droplets O were alternately dropped for 30 minutes. After the test, the amount of oil adhering to the oil catch 23 was measured, and the recovery rate was calculated by the following equation. The oil catch 23 includes a groove 23 a, a bottom plate 23 b that extends at the upper end of the groove 23 a and is disposed below the fan 22, and a back plate 23 c that is erected on the bottom plate 23 b and disposed behind the fan 22. The oil adhering to the fan 22, the catch panel 21, and the current plate 20 flows into the groove 23a through the bottom plate 23b and the back plate 23c and is collected.
Recovery rate = amount of oil collected in the oil catch / amount of oil charged (30 g)
Examples 1 to 4 were good with a recovery rate of 50% or more, and Example 5 had a recovery rate of 45%, and there was no practical problem. On the other hand, in Comparative Examples 1 and 2, the recovery rate was 30 to 32%, and the recovery rate was low.

Moreover, the state of contamination of each part of the range hood R was visually evaluated. The evaluation criteria are as follows. The results are shown in Table 1. Good: Appearance is good with no noticeable oil contamination. Δ: Conspicuous oil contamination is conspicuous.

It is sectional drawing which shows an example of embodiment of this invention. In an Example, it is the schematic which shows the experimental method for measuring a recovery rate. An example of a range hood is shown, (a) is a perspective view, (b) is a schematic view. The other example of a range hood is shown, (a) is a perspective view, (b) is a schematic diagram.

Explanation of symbols

1 Coating 2 Base material

Claims (4)

  An oil-lubricating member characterized in that a coating film having an oil lubrication angle with respect to oleic acid of 20 ° or less is provided on the surface of a substrate.   The oil-lubricating member according to claim 1, wherein a difference between an advancing angle and a receding angle of oleic acid on the coating is 0 to 10 °.   The oil-lubricating member according to claim 1 or 2, wherein the coating is formed of a fluororesin having a dimethylsilicon group and a hydroxyl group, and an amino resin or an isocyanate compound. The oil-slidable member according to any one of claims 1 to 3, wherein the coating contains an acrylic resin having a Tg of 40 to 100 ° C and a hydroxyl group.

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