JPS60225672A - Icing preventive method - Google Patents

Abstract

PURPOSE:To strengthen the icing preventive capacity of a composition for an icing preventing material and to increase the lasting property of said capacity, by coating the surface of an article, which was coated with a specific primer, with said composition having paraffin added thereto. CONSTITUTION:An organopolysiloxane resin or a silane coupling agent or a primer prepared by mixing both of them is applied to the surface of an article. Next, a composition, which is prepared by uniformly dissolving or dispersing an alkali metal compound and paraffin in 40-99.6% of an organopolysiloxane resin respectively in an amount of 0.2-30wt%, is applied thereto to form a coating layer. If necessary, silicone oil can be further applied to the coating layer. Furthermore, the organopolysiloxane resin to be used is represented by an average compositional unit formula I and the slkali metal compound by formula II.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing icing, and more specifically, the present invention relates to a method for preventing icing. Based on 0+ sun resin, a composition in which an alkali metal compound and paraffin are uniformly dissolved or dispersed in the matrix is applied to form the outer layer M layer winter eggplant and LFh rumor ヱ - & J,
1. It is possible to prevent strong adhesion of ice to the surface of the covered object when water freezes, and its sustainability is achieved by further applying silicone oil to the surface of the covering layer as necessary. This invention relates to an excellent method for preventing icing.

BACKGROUND OF THE INVENTION In the past, attempts have been made to reduce the icing force by applying various types of coatings to the surface of objects as one of the measures to prevent icing. As the coating material, acrylic resin-based, rubber-based, fluororesin-based and silicone resin-based coating materials are known. Among these, various silicone-based organoboryl 0+ sun resins are particularly widely used. For example, Soviet Patent No. 739080 discloses a two-layer silicone-based chicken water prevention paint. Also, US Patent No. 42712
No. 15 discloses an anti-icing coating using a tetraalkoxytitanium compound as an adhesion catalyst to a specific silicone resin having a carboxylic functional group.

Problems to be Solved by the Invention Although it is possible to more or less reduce icing by coating the surface of an object with these paint compositions,
It has not yet been possible to completely prevent the strong adhesion caused by hydrogen bonds in ice. Therefore, the present inventor conducted basic research on the mechanism of icing, categorized it into three factors: interface science, physical, and thermodynamic, and found that an alkali metal compound with a hydrogen bond dissociation effect was found. We have previously proposed a composition for an anti-icing material that exceeds the anti-icing ability of conventional coating materials by combining it with Organovo 990 Sun resin (see Japanese Patent Application No. 57-136570). The proposed composition for an anti-icing material exhibits a practically satisfactory interfacial fracture force when ice is pulled vertically at the ice-paint interface; however, shear fracture at the interface Because some force remains, it is not possible to completely prevent adhesion due to hydrogen bonding of ice.Therefore, there is a strong desire in this field to develop compositions for anti-icing materials with low shear fracture force at the interface. It is requested.

Means for Solving the Problems Therefore, the present inventor has conducted intensive studies on a method for reducing the shear fracture force at the ice-paint interface in the previously proposed composition for anti-icing materials, and as a result, the present inventors have We have discovered that by adding a specific amount of parafisi to a composition, not only can the shear fracture force at the interface be reduced, but also the sustainability of the anti-icing ability can be greatly improved, and we have also applied silicone oil to the surface of the coating layer of such a composition. It has been found that the anti-icing performance is significantly enhanced and the durability of the performance is increased.

Furthermore, a coating layer of such a composition formed directly on the surface of an object, or a coating layer on which silicone oil is applied, often lacks adhesion to the surface of the object. Rei rr+
- Serving back side 4 - Organoborishi O + Sun resin or silane cup linking agent, or a mixture of both, which has the effect of improving adhesion to both the surface and the coating layer, is used as a primer on the surface of the object. It was discovered that coating is extremely effective in holding and fixing the coating layer on the surface of an object, leading to the completion of the present invention.0Constitution, operation, and effects of the inventionThus, according to the present invention, the coating layer can be applied to the surface of the object to be coated. , the following average compositional unit formula % formula % (wherein, R represents a monovalent organic group bonded to silicon through a carbon-silicon bond, or hydrogen; R□ is hydrogen, C□~
C2° alkyl group, acyl group, aryl group or oscime residue; n and m each have a value less than 4, and 0<1
1+ttl<4)
Alternatively, a primer containing a silane cut resin (B) is applied, and then a primer containing the organobori resin (A) 40 to 99.6% and the following formula Ma(+)Xθ (wherein, M is Alkali metal selected from Li, Na and K; X is an inorganic acid group, hydroxyl group or organic acid group 9a is 1-
0.2 to 50% by weight of an alkali metal compound (C) represented by the current integer) and liquid paraffin and/or solid paraffin (D
) A method for preventing icing is provided, which comprises applying an anti-icing composition containing 0.2 to 30% by weight, and further applying silicodi oil thereon, if necessary.

Effects and Effects of the Invention The effects of the method according to the present invention on preventing icing are as follows: This appears as a combined effect of the properties and physical properties, the thermodynamic action of the alkali metal compound (Q), and the surface orientation properties of the paraphytes, and can completely prevent icing.

That is, since the organovo 950-san resin (a) has hydrocarbon chains arranged on its surface, its surface energy is low, and since it has extremely few polar components that can form hydrogen bonds, it forms a water-repellent surface.

In addition to this low surface energy, the icing reduction performance of the Organopolysil 0+ Sun resin is also largely due to its physical properties, particularly its low-temperature properties. That is, the organoboris 0
The rigidity of Tosashi resin is small, and its glass transition temperature is low, so its molecular motion is not frozen even under extremely low temperatures, for example -30°C. Hard to target.

Furthermore, the action of Q in alkali metal compounds can be explained by taking the example of a lithium compound in an alkali metal compound.The ionic radius of Li is small (7-(0,6,4)), and therefore the hydration energy is 125k
g cat f / Jon (incidentally, Ha ■ is 94.6 cat / Jon). And Li
■Five molecules of water are adsorbed on the ion wall, and 10 molecules of water are also adsorbed on the outside, but these water molecules are too close to the lithium ion, so they are not as strong as hydrogen bonds. Since it is adsorbed with energy 1,000-, no hydrogen bond is formed. That is, the lithium compound trapped in the matrix of Organopolysy D+phosphorus resin does not freeze water molecules adsorbed on the surface of the coating material, so ice does not adhere to it.

Although such an effect is seen with Ha₂ ions and Ha₂ ions, Li₂ ions are much more effective and are more suitable.

Furthermore, the action of the paraffin substance in the present invention is an orientation effect on the surface, which is due to nonpolar hydrocarbon chains arranging on the surface to lower the surface energy and at the same time impart lubricity to the surface. This reduces the shear fracture force at the ice-paint interface.

Organovo 950-san resin (4 is the above-described average compositional unit formula Rn 5i (OR) 0 (n and ml fPl-L;
L: 1L is O to less than 4, and must be a value satisfying 0<n+m<4 (however, n and m are not both O), and can be dispersed in water and organic solvents and/or Or it can be dissolved to form a liquid state.

R in the above formula is a carbon-silicon bond, a monovalent organic group bonded to silicon, or hydrogen.

Examples of the organic group include methyl, ethyl propyl,
Alkyl groups such as hexyl; alzyl groups such as hexyl, butyl, and pentyl; aryl groups such as phenyl, tolyl, +silyl, and naphthyl; benzyl, phenylethyl, and methylbenzyl Alkyl groups such as , naphthylbenzyl; Alkenyl groups such as di-nyl, allyl, oleyl; cyclopentadienyl, 2-Schif0
Examples thereof include alkenyl groups such as dithenyl; alkenylaryl groups such as dinylphenyl. Among them, lower alkyl groups having 1 to 6 carbon atoms are effective in preventing icing.

In the formula, R□ is not only hydrogen, but also a C□-C2° alkyl group such as methyl, ethyl, propyl, butyl, amyl, hesyl, octyl; aryl group; acetyl,
Examples thereof include C□-C8 acyl groups such as fluoride, butyryl, etc.; oxidium residues; and the like.

The above-mentioned Orkanopolysil resin used in the present invention can be used without any restriction on molecular weight as long as it can be dispersed and/or dissolved in water and organic solvents as described above, but it can be used without any restriction on molecular weight. The number average molecular weight is about 3
00 to about 1.000.000, preferably about 1,000 to about 500,000.

Moreover, the orkanobori-sashi resin having a reactive group such as a hydroxyl group or an alkoxy group in the molecule is preferably used. Examples of such organovo 950 resins include Z-6018, Z-6188, 5
vlkyd 50, DC-3037 (Dow Corn
manufactured by iny), KR-216, KR-218, xs
p-1 (Shin-Etsu Silicone Co., Ltd. product), TSR-160
, TSR-165 (Tokyo Shibaura Electric Co., Ltd. product), 5E1
8215EI980.5R9140,5RX211. P
Examples include RX305.5H237,5Hc)551RTV (product of Toshi Silicone Co., Ltd.).

The amount of the above-mentioned Organovo 950 Sun resin used is 40~
99.6% by weight, preferably 75-99.0% by weight. The amount used exceeds 99.6% by weight, or 4
When the amount of grooves is reduced to 0% by weight, the icing property increases significantly.

In addition, the general formula A/a used in the anti-icing composition
M in the alkali metal compound (C) represented by X is an alkali metal selected from Li, Ha and K, with Li being preferred among them. In addition, X can be an inorganic acid group, a hydroxyl group, or an organic acid group, and an inorganic acid group refers to a residue obtained by removing one or more hydrogen atoms that can be substituted with a metal from an inorganic acid molecule, and includes Fe, Ole, etc. , B rθ and Iθ
Monoatomic and NoθCo 2θPO3θHPO
2e 502e H2Oe31314 tsu 4 ν 4
141 Mn0 e Cr O”e SiO”e Si02e
It can include atomic groups such as BOθ41 27+ 41 31 21 , VOa3θ, WO4''θ, and the like.

In addition, the organic acid radical refers to a portion of a saturated or unsaturated heptanocarboxylic acid or polycarboxylic acid after removing one or more hydrogen atoms that can be substituted with a metal, such as 1rcooc) and the general formula % formula %) Saturated supercarboxylic acid radicals; General formula 12- Unsaturated acid radicals such as maleic acid, oleic acid: Jm, linoleic acid; Other tartaric acid radicals θOOC (CHOH) 2-COO
θ citric acid group CHCooθ HO-C-COOθ cg cooc) polyvalent carboxylic acid group; and the like.

Further, a is determined depending on the type of inorganic acid radical or organic acid radical, and is usually an integer of 1 to 4.

Therefore, the following can be exemplified as representative examples of the alkali metal compounds represented by the above formula.

LiF, LiC4, LiBr, Lil, Na
F, NaC4, NaBr.

Nal, KF, KCl, KBr, ,K
I, LiNO3, NaNO3, KNO3゜Li2C
O3, Ha2CO3, K2No3. Li, PO4, H
a3PO4゜KJ'04. Li25o4. Na25
o4. K2So, ; LiMnO4゜NaMnO4
, KJfnO4, Li2Cr2O7, Ha2Cr20.
.

K2Cr2O7, Li4Sin4. Lt2S;03.
Na4Sio4゜Na2SiO3, 4SiO4, 2S1031LiBO2, NaBO2゜KBO2, Li
3VO4, Na3VO4, K3VO4, Li2WO4゜Halol,; HCOOLi, HCOONa,
HCOOK, Li2C2O4゜Na COK C
OCHCOOLi CM C00Na22ノ1μ922
41313 CH3COOK, C2H5COOLi, LiC00
C-CH2-COOLi.

Lithium citrate, sodium citrate, potassium citrate, lithium tartrate, lithium trimellitate, di0
Lithium mellistate, etc.

Among these alkali metal compounds, chloride has the greatest anti-icing effect. However, when such strong acid salts are used, they have the property of causing rust on metal materials, so care must be taken when using them. Next, carbonates, silicates and acetates have the greatest anti-icing effect, and these are preferable because they have a long-lasting anti-icing effect and are less likely to cause rust. Further, among these alkali metal compounds, lithium compounds are preferred because they have a greater anti-icing effect than other sodium compounds and potassium compounds.

These alkali metal compounds can be used alone or in combination of two or more, and the amount thereof is 0.2 to 30% by weight, preferably 0.5 to 10% by weight. If the amount of the alkali metal compound is less than 0.2% by weight, the anti-icing effect will be significantly reduced, and if it exceeds 30% by weight, the physical properties of the coating will deteriorate and it will not be able to withstand long-term use. There is.

In addition, the substances used in the anti-icing composition are conventionally known liquid paraffin and solid paraffin, and the former liquid paraffin mainly consists of hydrocarbons having 10 to 24 carbon atoms and has an average molecular weight of about 15
It exhibits a liquid state at room temperature of 0 to 250°C, and is also commonly referred to as white oil. On the other hand,
The latter solid barafisi is composed mainly of hydrocarbons having about 18 to 30 carbon atoms, has an average molecular weight of about 250 to 350, and has a melting point of 50°C or less, preferably 40°C or less, and is dissolved in a solid ordinary organic solvent at room temperature. It is possible to disperse. Among these paraffin substances, liquid paraffin has a low pour point (our paint) of -5°C or less, which maintains fluidity even at temperatures below the freezing point, so it is extremely effective in reducing shear fracture force. Therefore, it is suitable.

16- Representative examples of paraffin include liquid paraffin with the trade name "Carnation" and "Klear".
ol n.

1Bland01″ llB#tt01 ”,” Ka
ydol” etc. (all sold by Witca Chemical in the United States)
a1 company product), and the solid paraffin is paraffin wax 110.115.12 manufactured by Nippon Seiro Co., Ltd.
Examples include 0.

When the content of these paraffin substances (c) is 0.2 to 3°, no decrease in shear breaking force at the coating film interface is observed, while on the other hand, when it exceeds 30% by weight, the physical properties and durability of the coating film are deteriorated.

In addition, pigments, extender pigments, surfactants, and other additives can be added to the above composition as appropriate.

The prevention of icing in the present invention is achieved by applying the anti-icing composition to the surface of an object. The degree of adhesion varies depending on the object surface material, roughness, shape, etc., but in general, the adhesion between the object surface and the coating layer is small, and the coating layer bulges on the object surface.
Due to the occurrence of defects such as peeling, the desired icing prevention effect may not be obtained in practice. For this reason, in the present invention, the above-mentioned Organovo 950-san resin (4 or silane coupling agent CB) or a mixture solution of the two in any ratio is applied as a primer to the surface of the object in advance, and the anti-icing property is applied thereon. By applying the composition, the problem of adhesion can be solved, and as a result, the coating layer can be formed that firmly adheres to the surface of the object, and a remarkable anti-icing effect can be obtained.

In the above limer, organopolysilosashi resin (
When using →, this material is the organopolysilicone resin (A) that constitutes the matrix of the anti-icing coating layer.
Since they have the same or similar structure, they have a high affinity and can have strong adhesion to the coating layer. Furthermore, the hydroxyl groups, alkoxyl groups, ot-san, etc. contained in the structure of organopolysiloxane: J resin (a) have strong adhesion to the surfaces of objects to be coated, especially inorganic surfaces. As a primer, it strengthens the adhesion of the coating layer to the surface of the object to be coated.

Solvents commonly used in paints, such as organoboric chain or cyclic hydrocarbons used as primers, ketones, esters, and alcohols, can be used. The concentration of the organoboryl 0 + sun resin solution is not particularly limited, but is preferably in the range of 3 to 30% by weight. For example, the following formula % formula % [wherein R2 is an alkyl group having 1 to 8 carbon atoms, an allyl group,
Aryl group, vinyl group, amino) group, H2NCH2CH2
NH- group, (Me5 >"j' IJ [1 Cow group 1
Represents a talicido+shi group, a mercapto group, anilino group, an octadecyldimethylacet7ium group, or a halogen atom; Z represents OR3 or a halogen atom; represents an alkyl group, an allyl group, or an aryl group; door is O or 1
represents an integer of ~6; q represents an integer of I or 2] Compounds represented by the following can be mentioned.

Specific examples of the silane coupling agent represented by the above formula include methyltrimethodisilane, J≦nLtl
〒にearth;,;,±1. mama j” wo taka-1-r-2O
- (2-aminoethyl)aminoethyl methyldimethoxyl disilane 1γ-(2-aminoethyl)aminoethyl methyldimethoxyl disilane, γ-methacrylate 0xyltrimethoxyl disilane, γ-talicidyl silane, γ-Mercatosilane, γ
-Mercapdobutylmethyldimeth + disilane, dinyltriacetate disilane 1 gamma-ri00 pyl methyl dimethyl disilane 1 gamma-ri00 pyl methyl dimethoxyl disilane, diniltris (metyl tris) silane, Examples include dinyltrimethyldisilane\methyltric00silane, dimethyltrimethoxysilane, trimethyltrimethoxysilane, and the like.

Among the above-mentioned silane coupling agents, those suitable for the present invention are di- or trialkyl (or alco-alkyl) silane compounds.

The silane coupling agent solution used as a primer may be prepared by dissolving the silane coupling agent in the above-mentioned paint solvent or water. The concentration of the silane coupling agent solution is usually 0.05 to 3
0% by weight, preferably in the range from 0.1 to IO% by weight.

If the concentration exceeds 30% by weight, drying will be delayed and interlayer adhesion with the top coat will be impaired. 0.05% by weight on the other side
If it is less than that, the effect of improving adhesion cannot be obtained.

In the present invention, when a silane coupling agent is used as a primer, the silane coupling agent generally includes a functional group (amino) group that reacts with an organic substance, a vinyl group, an evo+cy group, a mercapto group, a methacryl group, a methacryloxy group, etc. )
and functional groups that react with inorganic substances (methoxy group, eth+oxy group,
It has the function of bonding organic and inorganic substances by reacting with organic substances and inorganic substances. Strengthens the adhesion between objects and surfaces. For this reason, a primer made of a silane coupling agent is more suitable.

In the present invention, the above-mentioned Organovo 95Oshisan resin solution and silane coupling agent solution may be used alone as a primer, or both may be used in combination as a primer. The coating of the primer can be carried out by ordinary coating methods such as brush coating, spray coating, dip coating, etc., and the coating amount is in the range of about 0.1 to 30 μm in dry film thickness, and when using only the disilane coupler agent. is 0.1 to 5 μm, and 5 to 30 μm in the case of organopolysiloshisan resin alone. The primer coating film usually dries in 2 to 48 hours at room temperature, but may be heated to speed up drying.

In the present invention, after the primer is applied to the surface of the object to be coated, the anti-icing composition described above is applied using a conventional coating method. The coating amount is approximately lO~300μ in dry film thickness.
It is preferably 30-100μ and 23-μ. The paint film can be dried at room temperature or heated (approx.
0°C).

Furthermore, in the present invention, silicone oil can be further applied on the anti-icing coating layer formed as described above, if necessary.

When silicone oil is applied to the surface of the coating layer, its own ability to reduce icing is synergistic with the remarkable anti-icing performance of the surface of the coating layer, resulting in a dramatic enhancement of the anti-icing performance.
and is extremely effective in significantly increasing its sustainability.

As such silicone oil, conventionally known silicone oils can be used, such as 5H-51Q manufactured by Toshi Silicon Co., Ltd.
5H-200 or the like is used.

The application of silicodioil may be carried out using ordinary application means, and the application amount is 3 to 50 f/d, preferably 5 to 20 f/d.
The range is fl/d.

Hereinafter, the present invention will be described more specifically with reference to Examples. Parts and weight % are shown.

Example 1 Methyltriethyldisilane (trade name: 5Z6072 manufactured by Toshi Silicone Co., Ltd.) was applied to a 211I thick aluminum plate.
% toluene solution was applied with a brush and dried at room temperature for 2 hours. Next, condensation type Orkanoborishi Oshisan resin (trade name: Toshi Silicone Co., Ltd. fgPRX-305) 10 O
N, carbonate IJf') 65 parts and liquid paraffin (trade name; Witt, USA).

Mix 8 parts of Cttrpttxtitrn manufactured by Ctmica1 (pour point -7°C), and paint 75! The mixture was dispersed for 1.5 hours in a conventional manner using an issuer to obtain an anti-icing coating composition. This was applied onto the aluminum coated plate treated with the Shirashikapurishi and adhesive agent by an air spray method so that the dry coating thickness was 70 μm.

This test board was fixed at an angle of 45 on the south side, and the state of the paint film was observed after 6 months of outdoor dust removal.Using the painted board,
The anti-icing coating composition and application procedure were the same as in this example (Comparative Example 1).

Example 2 Thickness 0, 8 coated with Eboshi-based anti-corrosion primer
γ-(2-aminoethyl)aminobutylenemethyldimeth+disilane (trade name; manufactured by Toshi Silicone Co., Ltd., 52-6023) and condensation type organopolysiloxane resin (trade name; Silicone Co., Ltd. 5H-
A composition containing 237) and a diluting solvent (toluene) in a ratio of 5:10:85 was applied with a brush. Next, addition polymerization type orkanopolysil O'F"j:, 100 parts of I resin (trade name: Toshi Silico: JSE-1821), potassium acetate 06
10 parts and liquid paraffin (trade name: US Wit
Kaydal pour point -18 manufactured by c 0 Chemica1
℃) were mixed and dispersed in the same manner as in Example 1.

To this was added 10 parts of SE=1821 cat (trade name: platinum-based catalyst manufactured by Toshi Silicone Co., Ltd.) as a curing catalyst, and the mixture was coated on the coated plate that had undergone the above pretreatment.

This test plate was fixed at an angle of the south face 45 and weather resistance and water resistance tests were conducted. As a comparative example, an uncoated board with a silane coupler agent was used, and the anti-icing coating composition and application procedure were the same as in this example (Comparative Example 2).

Examples 3 and 4 27-2 tttytt thick mild steel plate was coated with r-methacrylate 0 beef cyprodyltrimethane (trade name: MOPS manufactured by Chisso Corporation)
A 10% toluene solution of -M) was applied with a brush and dried at room temperature for 5 hours. Next, condensation type Oruga Nopolishi Ojusashi resin (trade name: 5H-237 manufactured by Toshi Silicone Co., Ltd.)
100 parts, 3 parts of lithium chloride and liquid paraffin (trade name: Kayd manufactured by Witto Chemica 1, USA)
ol (pour point -18°C) were mixed and dispersed in the same manner as in Example 1 to obtain a coating composition. This was applied onto the coated plate treated with the silane cup linking agent by an air spray method. The dry coating thickness at this time was 120 μm. ■ After 6 hours, apply silicone oil (product name: 5H-200, 50tfiS manufactured by Toshi Silicone Co., Ltd.) on the coating film.
) was applied with a brush to complete the anti-icing coating.

This test board was fixed at an angle on the south face 45, and the outdoor bar 28- icing force was tested. Tests were conducted in the same manner as in Example 3, with respect to those not coated with silico-di oil (Example 4) and those not treated with a silane coupler agent (Comparative Example 3).

Examples 5 and 6 10fl thick stainless steel plate Niji Niltris (Metogyu Shedgyushi) Silan (trade name: 5H60 manufactured by Toshi Shirikoshi Co., Ltd.)
Mix 10 parts of 15% iso-50 panol solution of 82); 5H-237, manufactured by Toray Silicone Co., Ltd.; A coating composition was obtained by dispersing in the same manner as in Example 1. This was applied onto the coated plate treated with the silane cup linking agent using an air spray gun. The dry film thickness at this time was 5
It was 0 μm. After 24 hours, silicone oil (trade name: D 3770, manufactured by Chisso Corporation) was applied onto the coating film using a brush. A water resistance test was conducted using this test plate, the state of the coating film was observed, and an icing power test was conducted. As Example 6, a coating with the above-mentioned coating composition and application procedure but without silicone oil treatment was used.

Comparative Example 4 Thickness 0.811 coated with Epo+Si anti-corrosion primer
A long-oil-based alkaline resin paint (SD Marine Paint, trade name manufactured by Kansai Paint Co., Ltd.) was applied to a M mild steel plate with a dry film thickness of 70 mm.
It was coated to a thickness of μm. An icing force test was conducted using this test plate. The icing shear fracture strength of this product is 3.
It was 4 kg/d.

Icing shear fracture strength test method: Stainless steel lithographic plate (1) (100 x 70 x 1011 nl) coated with the composition of the present invention shown in Figure 1 (D coating (
2) Place a stainless steel plate (3) (inner area: 5 d) on top, place this in a -IOoC freezing test constant temperature bath, and pre-cool for 90 minutes. Then, 2 ml of distilled deionized water maintained at 5° C. is poured into the link (3) and frozen, thereby obtaining ice (4) that adheres to the surface of the subject. After leaving it in this state for 2 hours at -1O°C,
The shear fracture strength was measured (unit: : kg/cd).

[Brief explanation of drawings]

FIG. 1 is a sectional view of an apparatus for testing the icing properties of the composition for anti-icing materials of the present invention. (1)...Stainless steel i-lithographic plate. (2)...Coating film, (3)...Stainless steel Rin J. (4)...ice, (5)...operating rod. (that's all)

Claims (1)

[Claims] ■ The surface of the object to be coated is coated with the following average compositional unit formula 8% (wherein, R represents a monovalent organic group bonded to silicon through a carbon-silicon bond, or hydrogen; R1 represents hydrogen, C1~
C2° alkyl group, acyl group, aryl group, or ox shim residue; n and m each have a value of less than 4, and 0 (
n -1-m (indicates a value that satisfies 4)
Alternatively, a primer containing the silane coupler agent (B) is applied, and then the organovolip 0 + sun resin (,4) 40 to 99.6% of the following formula (where M is Li, Na, and K) is applied. 0.2 to 30% by weight of an alkali metal compound (C) represented by a selected alkali metal; D
) A method for preventing icing, which comprises applying an anti-icing composition containing 0.2 to 30% by weight, and further applying silicone oil thereon, if necessary.