JPH07148879A - Ice coated snow-adhesion preventive sheet - Google Patents

Abstract

PURPOSE:To prevent ice coated snow stably from adhering for a long period at a low cost by a method wherein a front surface layer laminated on a heat insulated layer consisting of a sponge material is formed of rubber or resin dispersed so that lubricant can be bled. CONSTITUTION:An ice coated snow-adhesion preventive sheet can be obtained by molding a sponge sheet and laminating a rubber layer or organic resin which contains lubricant on the sheet. When the rubber layer, for example, silicone rubber is laminated in that case, a composition for forming rubber containing lubricant is applied onto the sponge sheet, and then cured by heating or the like to manufacture the ice coated snow-adhesion preventive sheet thereby. Besides, when organic resin such as olefin resin or the like is used, since its adhesion to a heat insulated layer is scarce, it is manufactured by preliminarily molding a resin film containing lubricant, treating the film with a primer if necessary, and bonding it to the sponge sheet by using an adhesive, a pressure sensitive adhesive, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice-and-snow adhesion preventive sheet, and more particularly to an ice-and-snow adhesion preventive sheet comprising a laminate of a heat insulating layer and a surface layer.

[0002]

2. Description of the Related Art In cold regions, it is an important subject to prevent the accretion of snow on various structures.
In other words, if the snow and ice that has adhered is left unattended, the power lines and towers will collapse due to its weight, causing imbalance in ships, causing capsizing, and even crushing houses in general houses. Because it causes a disaster.

[0003] Conventionally, in order to prevent the adhesion of such frost and snow, for example, a fluorine-based paint is applied to the surface of the structure to reduce the surface energy, or a paint containing lithium soap is applied. Attempts have been made to form a film of water on the surface of the structure and drop it by the weight of snow and ice.

[0004]

However, although the above-mentioned means achieves good results in the initial stage, there is a problem in that satisfactory results cannot be obtained over a long period of time.
In a general house, a water sprinkler or a sheet heating element is attached to the roof to attempt snow melting, but there are problems that the cost is very high and that it is not very effective in the case of a large amount of snow.

Therefore, the object of the present invention is to achieve stable prevention of frost and snow adhesion over a long period of time, and at a low cost.
Another object of the present invention is to provide a tool for preventing snow from adhering to snow that can be easily used.

[0006]

According to the present invention, there is provided a heat insulating layer made of a sponge material and a surface layer laminated on the heat insulating layer, the surface layer being dispersed so that the oil agent can bleed. There is provided an ice-and-snow adhesion preventing sheet formed of a rubber or a resin.

Heat Insulation Layer In the ice-and-snow adhesion prevention sheet of the present invention, the heat insulation layer prevents heat from adhering to the surface of the sheet from radiating heat due to the heat insulation effect, thereby providing a stronger adhesion to the snow. It has a function to prevent the ice from showing.

What is particularly important is to use a sponge material as the heat insulating layer forming material. That is, by forming the heat-insulating layer with a sponge material, the degree of freedom of the surface layer that actually contacts snow or ice is increased, and the surface layer flexes to some extent due to external stress or vibration, and the surface tension is increased. It is possible to easily drop the snow and ice adhering to.

As a sponge material for forming such a heat insulating layer, one having an Asker C hardness of 60 or less, particularly 40 or less is suitable. If the hardness is higher than 60, a certain degree of freedom cannot be given to the surface layer, so that the effect of preventing snow from adhering to ice tends to decrease. In the present invention, various sponge materials can be used as long as they have particularly good weather resistance, for example, various synthetic rubbers such as chloroprene rubber, butadiene rubber, ethylene-propylene rubber, EPDM, silicone rubber and natural rubber. Although a sponge material obtained by foaming a rubber material such as the above can be used, the silicone rubber sponge is preferably used from the viewpoint that the hardness does not change even at a low temperature of −40 ° C. or less. This silicone rubber sponge can generally be easily obtained by heating and curing a mixture of an organic foaming agent such as an azo compound and an inorganic foaming agent such as ammonium carbonate. Further, the silicone rubber component in the sponge may be of any type of heat-curing type, condensation-curing type and organic peroxide-curing type. The foaming ratio is set to such a value that the Asker C hardness falls within the above-mentioned range and a suitable heat insulating effect is exhibited, but normally about 1.5 to 8.0 times is sufficient.

The thickness of the above-mentioned heat insulating layer is set so that a sufficient heat insulating effect is exhibited, but it is generally preferable that the heat insulating layer has a thickness of at least 1 mm or more, particularly 5 mm or more.

Surface Layer The surface layer laminated on the heat insulating layer is a rubber or resin layer having an oil bleeding on the surface thereof, and the oil can directly exert the effect of preventing snow adhesion.

As such an oil agent, any oil agent can be used as long as it does not easily deteriorate due to environmental conditions, but in general, it has excellent weather resistance and a small change in viscosity even at low temperatures. Silicone oil is preferably used. Such silicone oil can be obtained, for example, by the following average composition formula (1): R ¹ _a R ² _b SiO _{(4-ab) / 2} (1) where R ¹ is an unsubstituted or substituted monovalent hydrocarbon group,
A monovalent organic group selected from the group consisting of a polyether group and an amino group, R ² is a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group, and a and b are 0.001 ≦ a
It is a number that satisfies ≦ 1 and 1.95 ≦ a + b ≦ 3,
It is particularly preferable that the silicone oil has a viscosity (25 ° C.) of 30 cSt or more. That is, when the viscosity is too low, the silicone oil is not effectively retained in the surface layer, bleeding out becomes significant, and it may be difficult to retain the effect of preventing the adhesion of ice and snow over a long period of time.

In the above average composition formula (1), examples of the monovalent hydrocarbon group in the monovalent organic group of R ¹ include an alkyl group such as a methyl group, an ethyl group, a propyl group and a butyl group,
An aryl group such as a phenyl group, an alkenyl group such as a vinyl group, an aralkyl group such as a benzyl group, and a group in which a hydrogen atom of these groups is substituted with a halogen atom, a cyano group, an amino group or the like, for example, a chloromethyl group, 3, Examples thereof include halogenated alkyl such as 3,3-trifluoropropyl group, and among these, those having 1 to 10 carbon atoms are preferable. Examples of the monovalent hydrocarbon group in R ² include those similar to the above Tanaka hydrogen group, but those having 1 to 10 carbon atoms are particularly preferable. Also the group R ¹
And R ² may be the same.

The above silicone oil is usually a halogenated silane represented by the following formula (2): R ¹ _x SiCl _4-X (2) wherein X is an integer of 1 to 3, Formula (3): R ² _Y SiCl _4-Y (2) In the formula, Y is an integer of 1 to 3, and is produced by hydrolyzing and condensing a halogenated silane. Generally, a silicone oil containing a methyl group, a phenyl group and a group other than an alkyl halide as R ¹ and R ² is called a modified silicone oil.

Although the above-mentioned oil agent varies depending on its type, it is generally desirable that the oil agent is dispersed in the surface layer in an amount of 0.1 to 60% by weight, particularly 1 to 40% by weight. If it is dispersed and blended in an amount of more than 60% by weight, the amount of oil agent that bleeds out increases, which may result in contamination of the sheet. If it is less than 0.1% by weight, the amount of bleed-out is increased. It may decrease, and the effect of preventing snow from adhering to the snow may be unsatisfactory.

The surface layer made of rubber or resin holding the above oil agent preferably has a JIS-A hardness (hardness measured by JIS K-6301 A-type spring tester) of 5 or more. When the hardness is lower than 5, the heat insulating layer as the inner layer is not effectively protected, and the heat insulating layer is easily damaged when it is actually used. The surface layer preferably has a thickness of 5 mm or less, particularly 1 mm or less. If the thickness is larger than 5 mm, the surface layer is less likely to be deformed, and the effect of the present invention in which the degree of freedom of the surface layer is increased by forming the heat insulating layer with a sponge material may be impaired.

As the rubber or resin for holding the oil agent in such a surface layer, for example, various rubbers used for forming the sponge agent, olefin resins such as polyethylene and polypropylene, polyvinyl chloride,
Various organic resins such as vinyl resins such as polyvinylidene chloride, polyesters such as polyethylene terephthalate (PET), polyamides such as nylon 6,6 can be used, but silicone rubber is generally preferable. This silicone rubber has an advantage that it can be easily applied at any place, can be laminated on the heat insulating layer without using a primer treatment or a special adhesive, and has good weather resistance.

Production of Sheet The ice-and-snow adhesion preventing sheet of the present invention is obtained by forming a sponge sheet by a method known per se, and laminating a rubber layer containing an oil agent or an organic resin on this sheet. In this case, when laminating a rubber layer, for example, a silicone rubber, it is produced by applying a rubber-forming composition containing an oil agent onto a sponge sheet and then curing the composition by heating or the like. On the other hand, when an organic resin such as an olefin resin is used, the adhesiveness to the heat insulating layer is poor, so a resin film containing an oil agent is molded in advance, the film is treated with a primer if necessary, and a known adhesive is used. It is manufactured by adhering it to a sponge sheet using an agent or an adhesive. The ice-and-snow adhering prevention sheet thus produced is fixed to various structures and structures with a suitable adhesive or adhesive for use.

[0019]

EXAMPLES The present invention will be described in the following specific examples, but the present invention is not limited thereto. In the following examples, the viscosity is a measured value at 25 ° C.

Example 1 On a chloroprene rubber sponge having an Asker C hardness of 30 (thickness 10 mm), a polyvinyl chloride film having a thickness of 0.5 mm JIS-A hardness of 20 dimethyl silicone oil (viscosity 100 cSt) was used. The content of wt% was fixed using an acrylic adhesive to prepare an ice-and-snow adhesion prevention sheet. The above sheet was fixed to a 2 mm-thick iron plate using an acrylic pressure-sensitive adhesive material to give a test piece. The adhesion to ice was measured by the following method with respect to the test piece left indoors for 6 months and the one exposed to the outdoors for 6 months. The results are shown in Table 1.

(Measurement Method of Adhesive Force) Water is put in a polyethylene cup (diameter 45 mm × depth 20 mm), and the test body is placed upside down so as to cover the cup. This is left to stand in a constant temperature bath at -10 ° C for 24 hours. Then, the test piece with the ice attached was taken out of the constant temperature bath together with the cup, and immediately pushed with the pushle gauge in the shearing direction together with the cup to measure the adhesive force.

Example 2 Polypropylene film primed on a sponge (thickness 5 mm) of silicone rubber having an Asker C hardness of 20 Thickness: 0.4 mm JIS-A hardness: 99 or more Dimethyl silicone oil (viscosity 100 cSt 5% by weight) Primer: “Primer NC” manufactured by Shin-Etsu Chemical Co., Ltd. was used to prepare an ice-and-snow adhesion prevention sheet using an adhesive (“KE445” manufactured by Shin-Etsu Chemical Co., Ltd.). Then, Example 1
A test piece was prepared in the same manner as above, and the adhesion to ice was measured, and the results are shown in Table 1.

Example 3 Room temperature curable silicone rubber in which silicone oil is mixed and dispersed on a sponge (thickness: 5 mm) of silicone rubber having an Asker C hardness of 20. Trade name: “KE45” manufactured by Shin-Etsu Chemical Co., Ltd. JIS-A hardness: 20 Phenyl group-containing silicone oil (viscosity 100 cSt) [Shin-Etsu Chemical's silicone oil "KF50") 30
The content of wt% was applied to a thickness of 1 mm and cured to prepare an ice / snow adhesion prevention sheet. Then, a test piece was prepared in the same manner as in Example 1, the adhesion to ice was measured, and the results are shown in Table 1.

Example 4 In Example 3, a room temperature curable silicone rubber was prepared by mixing and dispersing 25% by weight of an alkyl-modified silicone oil (“KF414” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity 100 cSt) in place of the phenyl group-containing silicone oil. Except that
In the same manner as in Example 3, an ice accretion snow adhesion prevention sheet was prepared,
In addition, a test piece was prepared in the same manner, the adhesion to ice was measured, and the measurement results are shown in Table 1.

Example 5 In Example 2, instead of dimethyl silicone oil, a polyether-modified silicone oil (viscosity 100
cSt, Shin-Etsu Chemical Silicone Oil "KF35
1 ") was used in the same manner as in Example 2 except that a polypropylene film in which the particles were mixed and dispersed was used. The measurement results are shown in Table 1.

Comparative Example 1 A silicone rubber sponge having an Asker C hardness of 20 (thickness: 5 mm) was subjected to a primer treatment (“Painter 20” manufactured by Shin-Etsu Chemical Co., Ltd. was used as a primer), and a fluorine paint was added to a density of 0.
It was applied to a thickness of 1 mm to form a cured coating film (JIS-A hardness of 99 or more) to obtain an ice-and-snow adhesion preventing sheet. Hereinafter, a test piece was prepared in the same manner as in Example 1, the adhesion to ice was measured, and the measurement results are shown in Table 1.

Comparative Example 2 A silicone rubber sponge having an Asker C hardness of 20 (thickness: 5 mm) was directly fixed to an iron plate having a thickness of 2 mm using an acrylic adhesive material to prepare a test piece. Using this test piece, the adhesion to ice was measured in the same manner as in Example 1, and the measurement results are shown in Table 1.

Comparative Example 3 A PET film, the surface of which was treated with a fluororesin, was fixed to an iron plate having a thickness of 2 mm with an acrylic adhesive to prepare a test piece. Using this test piece, the adhesion to ice was measured in the same manner as in Example 1, and the measurement results are shown in Table 1.

[0029]

[Table 1]

[0030]

The ice-and-snow adhesion prevention sheet of the present invention has the surface layer itself which is impregnated with the oil agent and bleeds on the heat-insulating layer formed by using the sponge material. The free-deformability and the effect of preventing the adhesion of oil can be combined to prevent the adhesion of snow and ice over a long period of time, and it is extremely useful for preventing the adhesion of ice and snow to various structures or structures especially in cold regions. is there.

Claims (7)

[Claims] 1. A heat insulating layer made of a sponge material, and a surface layer laminated on the heat insulating layer. The surface layer is made of rubber or resin dispersed so that an oil agent can bleed. A sheet for preventing snow from adhering to ice. 2. The ice-and-snow adhesion preventing sheet according to claim 1, wherein the heat insulating layer has an Asker C hardness of 60 or less and a thickness of 1 mm or more. 3. The ice-and-snow adhesion preventing sheet according to claim 1, wherein the heat insulating layer is made of silicone sponge rubber. 4. The surface layer has a hardness of 5 or more measured by a JIS K-6301 A-type spring tester and a thickness of 5 mm.
The following is an ice-and-snow adhesion prevention sheet according to claim 1. 5. The oil agent has the following average composition formula (1): R ¹ _a R ² _b SiO _{(4-ab) / 2} (1) In the formula, R ¹ is an unsubstituted or substituted monovalent hydrocarbon. Base,
A monovalent organic group selected from the group consisting of a polyether group and an amino group, R ² is a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group, and a and b are 0.001 ≦ a ≦ 1, And 1.95 ≤ a + b ≤
3. The ice-and-snow adhering prevention sheet according to claim 1, which is a silicone oil having a viscosity (25 ° C.) of 30 cSt or more. 6. The ice-and-snow adhesion preventing sheet according to claim 4, wherein the surface layer is made of silicone rubber. 7. The ice-and-snow adhesion preventing sheet according to claim 4, wherein the surface layer is made of an organic resin film.