JP2634591B2 - Seal material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sealing material, and more particularly to a sealing material that exhibits good waterproofing properties when used by bending or bending the sealing material. Is what you do.

<Prior art and its problems> Conventionally, polyurethane foam is impregnated with asphalt or coal tar, and ethylene-propylene-
A porous sealing material such as a type obtained by forming a mixture obtained by adding a resin having excellent water repellency and adhesiveness to a terpolymer rubber into a sheet shape and foaming and vulcanizing the mixture is known.

Such a porous sealing material can provide the intended waterproofing property by compressing to, for example, 30 to 95% if the construction place is substantially straight, but the construction place is curved or bent. In this case, there is a drawback in that fine wrinkles are formed on the surface of the sealing material due to bending of the sealing material, and the fine wrinkles play a role of a water beaker, so that water leaks.

In order to prevent wrinkling of the sealing material, an attempt has been made to attach a plastic film to the surface of the sealing material by using an adhesive means such as an adhesive, fusion, welding, or the like. However, there are inconveniences such as not being able to be performed, and the adherence of the film reduces the flexibility of the foam, and the desired followability cannot be obtained.

<Means for Solving the Problems> The present invention provides a novel sealing material that has solved the above-mentioned drawbacks of the prior art, and the gist of the invention is to exhibit waterproofness by compressing. The object is to provide a coating foam layer on at least one surface of a porous sealing member having a rough surface.

Advantageous Effects of Invention According to the present invention, the adhesion between the porous sealing material and the applied foam layer is strong, and the adhesion between the surface of the adherend at the construction site and the applied foam layer constituting the sealing material is excellent, and the coating foam is formed. Since the layer does not absorb the strain due to bending and does not cause wrinkles, the layer has a characteristic of maintaining good waterproofness for a long period of time.

The porous seal member used in the practice of the present invention usually exhibits water resistance by compressing to 30 to 95%, but the surface is roughened such as a sliced surface of a foam or a sheet-like fibrous surface. It is something that is. The member also includes a foam in which one surface is a sliced surface and the other surface is a dense skin-like surface.

Examples of such a porous sheet member include polyurethane foam, felt, a thick nonwoven fabric alone, or a material obtained by impregnating and holding a waterproof composition such as asphalt, coal tar, synthetic rubber, and synthetic resin in these porous materials, or Foam vulcanization by molding into a sheet or the like an admixture obtained by adding a softening substance and / or resin having water repellency and tackiness to rubbers represented by ethylene-propylene-terpolymer rubber, butyl rubber, etc. After that, those obtained by slicing (cutting) to a predetermined thickness or width are exemplified.

The surface of the porous sheet member thus configured (the surface that is in contact with the adherend surface at the construction site) is equivalent to the member,
Preferably, a coated foam layer having more flexibility and a substantially smooth surface is provided, and is used as the seal material of the present invention.

Such a coated foam layer having a substantially smooth surface is excellent in flexibility, smoothness, and water repellency because the coated foam layer formed by the following methods (a) to (e) is excellent. It is preferred.

(A) Mechanically agitating a mixture comprising a rubber latex as a main component, a foaming agent, a structural reinforcing agent, and, if necessary, an adhesiveness-imparting resin, for 3 to 500 poise, preferably A water-dispersed polymer material containing fine bubbles, which is adjusted to a viscosity of 10 to 300 poise (each at 25 ° C.), on a porous sealing member, has a thickness of 1 to 3000 μm, preferably 50 to 1000 μm. And then pre-dried at 70 to 90 ° C. for 1 to 3 minutes, and then dried at 100 to 200 ° C. for 2 to 15 minutes to obtain a foamed layer having substantially the same thickness as the applied thickness.

The compound is made of natural rubber (NR), carboxyl group-modified styrene-butadiene rubber (C-SBR), nitrile butadiene rubber (NBR), rubber such as acrylic rubber, or synthetic rubber such as polyvinyl chloride, polyvinylidene chloride, and polyethylene. A foaming agent such as ammonium stearate, potassium oleate, or alkylsulfosuccinamate is used in an amount of 3 to 8 per 100 parts by weight of a solid content of a resin latex (solid content is preferably 40 to 70% by weight). 2 parts by weight of a structural reinforcing agent for improving the matrix strength of a thin layer such as methoxymethylolmelamine, sulfur, and epoxy resin.
10 parts by weight, 0 to 200 parts by weight, preferably 10 to 100 parts by weight of an adhesion-imparting resin such as a terpene resin, a terpene phenolic resin, a rosin, a rosin derivative, and a petroleum resin. Is desirable. Thus, a thickener, a filler, a structure strengthening aid, a pH adjuster, and the like can be further added to this formulation.

The composition constituted in this manner is 100-3000 revolutions /
The mixture is usually mixed and stirred by a mechanical stirrer for 1 to 10 minutes to obtain a water-dispersed polymer material of 3 to 500 poise (at 25 ° C.) containing fine foam of 1 to 1000 μm in the system. If the viscosity of the material is less than 3 poise (at 25 ° C.), it may contain foam, but it is not preferable because it may be impregnated into the porous sealing member. It is not preferable because it becomes difficult.

The water-dispersed polymer material thus adjusted, as described above, is directly applied to one or both surfaces of the sealing member so as to have a predetermined thickness, and then dried to remove fine bubbles in the water-dispersed polymer material. 1 without substantial change in size and shape
1 to 20 times including fine bubbles of ~ 1000 μm, preferably 2 to
The surface of the 13-fold foam is a smooth applied foam layer.

(B) Coating and foaming with a smooth surface by using a composition obtained by further adding a water-repellent substance such as wax, paraffin, silicone oil in the range of 0.1 to 70% by weight to the compound used in the method of (a). Layers.

According to the coating foaming formed by this method, the layer itself is further provided with water repellency, so that the waterproofness is further improved.

(C) Polymer materials such as acrylic resin, polyvinyl chloride resin, polyolefin resin, natural rubber, ethylene propylene terpolymer, styrene butadiene rubber, etc.
0 to 200 parts by weight of a softening agent such as dioctyl phthalate, petroleum oil, process oil, paraffin, lubricating oil, coal tar, aliphatic oil, wax, low molecular weight rubber, attack polypropylene, Pentamethylenetetramine, azodicarbonamide,
Paratoluenesulfonylhydrazine, 1 to 20 parts by weight of a foaming agent such as sodium bicarbonate, sulfur, methylolmelamine, epoxy resin, quinone dioxime, 0.5 to 10 parts by weight of a structural reinforcing agent such as peroxide,
In addition, fillers, pigments, lubricants, ultraviolet absorbers, and the like can be added as needed.

The polymer material is dissolved in an organic solvent, or dispersed in water to adjust the viscosity to 3 to 500 poise (at 25 ° C.), or melted at a temperature lower than the decomposition temperature of the foaming agent to form a porous seal. On the member, the thickness is 1 to 3000 μm, preferably 10
Coated foam layer having a smooth surface by directly applying so as to have a thickness of 0 to 1000 μm, and usually by heating at 60 to 200 ° C. for 1 to 20 minutes under compression of a roll or the like as necessary. To form

(D) Dissolve the polymer material used in (c) using a solution such as toluene, hexane, acetone, or ethyl acetate or a plasticizer such as dioctyl phthalate or dibutyl phthalate, and reduce the interfacial tension such as silicone oil. 1 to 10% by weight, and if necessary, a compounding agent such as a cross-linking agent, a filler, a pigment, and the like, and mechanically stirred to form a fine foam-containing solution polymer material. (I)
A foaming layer is formed in the same manner as described above.

(E) In the latex of (a) or the polymer material solution of (c), the expanded hollow microspheres composed of microcapsules or acrylonitrile are dispersed, and if necessary, compounding agents such as a crosslinking agent and a filler are added. It is applied and dried so that the thickness after drying becomes 1 to 3000 μm to form a coated foam layer.

Such a coated foam layer is formed on both surfaces of the porous seal member when both surfaces are rough surfaces such as slice surfaces,
Further, on one surface thereof, an adhesive layer composed of a substance mainly composed of rubber and / or synthetic resin and having a pressure-sensitive adhesive property at room temperature is provided.
It may be formed with a thickness of 0.1 to 1.5 mm, but for example, a coated foam layer may be formed on one surface and an adhesive layer may be formed on the other surface.

<Effect> As described above, the sealing material of the present invention forms a foamed layer by directly applying a foamed material to the surface of a porous seal member, so that the interface between the member surface and the foamed layer is integrated. Is strong, and even if the sealing material is bent or bent, the foam layer absorbs the distortion due to deformation, so that water bees are not formed and good waterproofness can be obtained for a long period of time. Have.

<Example> Hereinafter, an example of the present invention will be described. In the description, parts and% mean parts by weight and% by weight, respectively.

Example 1 Acrylic rubber latex (solid content 60%) 100 parts Epoxy resin aqueous dispersion (solid content 80%) 10 parts Potassium oleate soap (solid content 35%) 5 parts Sodium alkinate aqueous solution (solid content) 2%) 1 part Ammonia water (solid content 35%) 3 parts The above mixture is mixed and stirred with a mechanical stirrer to foam approximately 3 times, and this is an ether system with a foaming ratio of approximately 30 times and a thickness of 10 mm. Apply directly to the slice surface of the polyurethane foam using a doctor knife so as to have a thickness of about 100 μm.
For 1 minute, and then heated at about 140 ° C. for 10 minutes to crosslink the coating layer to obtain a sealing material having a coating foam layer having a thickness of about 100 μm on the slice surface.

Example 2 Carboxyl group-modified styrene-butadiene rubber latex (solid content 60%) 100 parts Melamine resin aqueous dispersion (solid content 80%) 5 parts Ammonium stearate salt aqueous dispersion (solid content 35%) 2 parts Carboxymethyl cellulose aqueous solution (solid content 2%) 2 parts Ammonia water (solid content 35%) 2 parts Clay 50 parts Wax aqueous dispersion (solid content 50%) 10 parts Mix and stir the above ingredients with a mechanical stirrer Approximately 5 times the foam, and the mixture of ethylene-propylene terpolymer and calcium carbonate is sulfur-vulcanized and foamed 7 times to a thickness of about 3 mm. Apply directly using a doctor knife as
Thereafter, the same operation as in Example 1 was performed to form a slice
A sealing material having a thick applied foam layer was obtained.

Example 3 100 parts of natural rubber, 3 parts of sulfur, 3 parts of zinc oxide, 1 part of dithiocarbamate, 5 parts of dinitrosopentamethylenetetramine, 2 parts of stearic acid, 20 parts of petroleum oil and 5 parts of urea
Parts of the mixture were kneaded with a rubber Banbury mixer, and toluene was added to obtain a solution having a viscosity of 10,000 CPS (at 20 ° C.) and a solid content of 50%.

The solution was applied to the sliced surface of the rubber foam of Example 2 by 1000.
It was directly applied with a thickness of μm, and heated at 170 ° C. for 10 minutes to heat-foam the applied layer to obtain a sealing material having a coated foam layer of about 1200 μm on the slice surface.

Example 4 100 parts of polyvinyl chloride, 80 parts of dioctyl phthalate,
A mixture comprising 2 parts of lead salt dibasic phosphite and 3 parts of silicone oil was mixed and stirred with a mechanical stirrer to foam the foam approximately three times, and this was applied to a slice surface of the polyurethane foam of Example with a thickness of 500 μm. Apply directly with a doctor knife and heat at 190 ° C for 10 minutes.
A sealing material having a coating foam layer of μm was obtained.

Example 5 Acrylic rubber latex (solid content 60%) 100 parts Polyvinyl alcohol aqueous solution (solid content 5%) 2 parts Melamine resin aqueous dispersion (solid content 80%) 2 parts Ammonia water (solid content 35%) 2) Expanded hollow microspheres composed of Awariro nitrile (particle size
60 to 150 μm) 3 parts A solution of the above composition having a viscosity of 15000 CPS (at 20 ° C.) was directly applied to the slice surface of the rubber foam of Example 2 with a doctor knife so as to have a thickness of 200 μm.
It heated at 10 degreeC for 10 minutes, and obtained the sealing material which has the coating foam layer of specific gravity 0.5 on a slice surface.

Table 1 shows the characteristic evaluation results of Examples 1 to 5. Comparative Example 1 in Table 1 uses the polyurethane foam of Example 1 as a sealing material, and Comparative Example 2 uses the rubber foam of Example 2 as a sealing material.

The measurement methods in Table 1 are as shown in FIGS. 1 and 2.
A 0.3 mm-thick butyl rubber-based adhesive layer 2 was applied to the non-coated foam layer surface of the sealing material 1 having a width of 10 mm obtained in Examples 1 to 5 and Comparative Examples 1 and 2 (only one side in Comparative Examples 1 and 2). This is attached to the surface of the glass plate 3 with a curvature of 100 mmR,
A glass plate 3 'is superposed thereon, and the jigs (not shown) are used to compress Examples 1 and 4 and Comparative Example 1 to 80%, while Examples 2, 3, 5 and Comparative Example 2 are compressed to 50%. % To make a measuring tool, and water is injected into the cavity made of the sealing material so that the water depth becomes 100 mm.
The presence or absence of water leakage from the interface with the surface was observed at predetermined intervals.

Judgment in Table 1 indicates that no water leakage was observed.
も の indicates that water leakage was slightly observed, and × indicates that water leakage was clearly observed.

[Brief description of the drawings]

FIG. 1 is a front view of a measuring tool for evaluating the characteristics of the sealing material of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1 taken along the line II ′. 1 ... seal material 4 ... coated foam layer

Claims (2)

(57) [Claims] (1) expressing waterproofness by compressing;
A sealing material comprising a coating foam layer provided on at least one surface of a porous sealing member having a rough surface. 2. The sealing material according to claim 1, wherein an adhesive layer is provided on one surface.