JPS63214573A - Seal material - Google Patents

Abstract

PURPOSE:To maintain good waterproofness for a long time by providing a coated foaming layer on at least one face of a porous seal member which has a rough surface and exerts the waterproofness when compressed. CONSTITUTION:A coated foaming layer with the same or preferably more flexibility than a porous seal member and a practically smooth surface is provided on the surface (the face to be brought into contact with the stuck body face at the application position) of this porous seal member such as a polyurethane foaming body and felt. Thereby, the porous seal member and the coated foaming layer are integrated at the interface, both of them are firmly stuck, and the adhesion between the stuck body face and the coated foaming layer constituting a seal material at the application position is excellent. In addition, the coated foaming layer absorbs the bending distortion and generates no wrinkle, thus good waterproofness is maintained for a long time.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a sealing material, and more particularly to a sealing material that exhibits good waterproof properties when used in a curved or bent manner. This is what we provide.

<Prior art and its problems> Conventionally, there have been types made of polyurethane foam impregnated with asphalt or coal tar, and mixtures made of ethylene-propylene-terpolymer rubber with the addition of resins with excellent water repellency and adhesiveness. Porous sealing materials, such as those made by molding into a sheet and foaming and vulcanizing, are known.

Such porous sealing materials can obtain the desired waterproof properties by compressing them to, for example, 30 to 95% if the construction site is on a substantially straight line, but if the construction site is curved or bent. In this case, the bending of the sealing material creates minute wrinkles on the surface of the sealing material, which act as water grooves and cause water to leak.

Glue the plastic film on the surface of the sealing material to prevent wrinkles of the sealing material.

Attempts have been made to attach using adhesive means such as fusion and welding, but 1. Strong adhesion between the two parts cannot be obtained, and the flexibility of the foam decreases due to the attachment of the film, making it difficult to achieve the desired tracking. Not being able to have sex.

It has the following disadvantages.

Means for Solving the Problems> The present invention provides a new sealing material that solves the drawbacks of the prior art, and its gist is that it exhibits waterproof properties by being compressed. A coating foam layer is provided on at least one surface of a porous sealing member having a rough surface.

According to the present invention, the adhesion between the porous sealing member and the applied foam layer is strong, and it does not absorb the surface of the adherend at the installation site and cause wrinkles, so good waterproof properties can be maintained for a long time. It has the characteristic of maintaining.

The porous sealing member used in carrying out the present invention is
Normally, waterproof properties are exhibited by compressing the material to 30 to 95%, but one surface is rough, such as the sliced surface of a foam or the surface of a sheet-like fibrous material. The member may also include a foam having a sliced surface on one surface and a dense skin-like surface on the other surface.

Such porous sheet members include polyurethane foam, felt, thick nonwoven fabric alone, or these porous materials with asphalt or coal tar.

In addition to impregnated and retained waterproof compositions such as synthetic rubbers and synthetic resins, or rubbers such as ethylene-propylene-terpolymer rubber and butyl rubber, softening substances and/or adhesives that have water resistance and adhesive properties can be used. Examples include those obtained by molding a mixture with resins into a sheet shape, foaming and vulcanizing it, and then slicing (cutting) it into a predetermined thickness or width.

The surface of the porous sheet member configured in this way (the surface that comes into contact with the surface of the adherend at the construction site) has flexibility equal to, and preferably greater than, that of the member.

Moreover, a coated foam layer with a substantially smooth surface is provided, making it a sealing material of the present invention.

Such coated foam j- with a substantially smooth surface has a coated foam layer formed by the following methods ((a) to (e)) that has flexibility, smoothness, and water repellency. It is preferable because it is excellent.

(a) Com latex as the main ingredient, plus a foaming agent.

A composition containing a structural reinforcing agent and, if necessary, an adhesion-imparting resin is mechanically stirred to give a pressure of 3 to 500 poise,
Preferably 10 to 300 voices (each at25"C)
A microfoam-containing water-dispersed polymeric material adjusted to a viscosity of After pre-drying for 1-3 minutes at ℃,
By drying at 0 to 200°C for 2 to 15 minutes, a foamed layer having approximately the same thickness as the coating thickness can be obtained.

The blends are natural rubber (NR) and carboxyl group-modified styrene-butadiene rubber (C-8BR).

Rubbers such as nitrile butadiene rubber (NBR), 7cryl rubber, polyvinyl chloride, polyvinylidene chloride,
Foaming agents such as ammonium stearate, potassium oleate, and alkyl sulfosuccinamate are added to 100 parts by weight of latex (preferably solids content is 40 to 70% by weight) made of synthetic resins such as polyethylene. 3 to 8 parts by weight of methoxymethylolmelamine, sulfur, 2 to 10 parts by weight of a structural reinforcing agent that improves the matrix strength of the thin layer such as methoxymethylolmelamine, sulfur, and epoxy resin, and terpene-based [JIl
It is desirable that the composition contains 0 to 200 parts by weight, preferably 10 to 100 parts by weight of adhesion-imparting resins such as l, terpene phenol type fat, rosin, rosin derivatives, and petroleum resins. . Thus, further thickeners, fillers, structural reinforcement aids, pH regulators, etc. can be added to the formulation.

The composition constituted in this way has a concentration of 1 (10 to 3000
Mixed and stirred for usually 1 to 10 minutes with a mechanical stirrer that rotates per minute, containing fine foam of 1 to 1000μ in the system.
It is considered to be a water-dispersed polymer material with ~SOO voids (at 25°C). If the viscosity of the material is less than 3 poise (at 25°C), although it contains foam, it is not preferable because it may be impregnated into the porous sealing member, and SOO days (
If the temperature exceeds (at 25°C), coating becomes difficult, which is not preferable.

As mentioned above, the water-dispersed polymer material prepared in this way is directly applied to one or both sides of the sealing member to a predetermined thickness, and then dried to eliminate the microbubbles in the water-dispersed polymer material. 1 to 1 without substantial change in size and shape
The coated foam layer is foamed 1 to 20 times, preferably 2 to 13 times, and has a smooth surface, containing fine bubbles of 1000 micron grooves.

(b) A coating with a smooth surface is obtained by adding a water-wetting substance such as wax, paraffin, or silicone oil in a range of 0.1 to 70% by weight to the formulation used in method (a). It is considered to be a foam layer.

The coating foam formed by this method further imparts water contact properties to the first layer body, thereby improving waterproofness.

(c) Polymer materials 10 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, Nitrosopentamethylenetetramine, azodicarbonamide.

containing 1 to 20 parts by weight of a blowing agent such as balatoluenesulfonylhydrazine, tj[sodium, and 0.5 to 10 parts by weight of a structural reinforcement such as sulfur, methylol melamine, epoxy resin, quinone dioxime, peroxide. Other fillers, pigments, lubricants, ultraviolet absorbers, etc. can be added as necessary.

The polymeric material is dissolved in an organic solvent or dispersed in water and adjusted to a viscosity of 3 to 500 poise (at 25°C), or melted at a temperature below the decomposition temperature of the blowing agent,
Directly apply it to the porous sealing member so that the thickness is 1 to 3000μ grooves, preferably 100 to 1000μ grooves.
Foaming and vulcanization is usually carried out by heating at 60 to 200° C. for 1 to 20 minutes, if necessary under compression using a roll, etc., to form a coated foam layer having a smooth surface.

(b) The polymer materials used in (c) are mixed with toluene, hexane,
Dissolve using a solution such as acetone or ethyl acetate or a plasticizer such as dioctyl phthalate or dibutyl phthalate, and add an interfacial tension reducing agent such as silicone oil to a concentration of 1 to 10% by weight, as necessary. Add compounding agents such as crosslinking agents, fillers, and pigments according to the requirements and mechanically stir to create a solution polymeric material containing microbubbles, as described in (a) below.
Coating foam/11 is formed in the same manner as above.

((e) Disperse microcapsules or expanded hollow microspheres made of acrylonitrile in the latex of (a) or the polymeric material solution of (c), and add compounding agents such as crosslinking agents and fillers as necessary. and fL are coated and dried so that the thickness after drying is usually 1 to 3000 μm to form a coated foam Im.

When both surfaces of the porous sealing member are rough surfaces such as sliced surfaces, such a coating foam layer is formed on both surfaces, and one surface is coated with rubber and/or synthetic resin as the main material. The adhesive layer made of a material that exhibits pressure-sensitive adhesive properties at room temperature is approximately 0.
．． Although it may be formed to a thickness of 1 to 1.5 mm, for example, a coated foam layer may be formed on one surface and an adhesive layer may be formed on the other surface.

<Effects> As described above, in the sealing material of the present invention, since a foamed material is directly applied to the surface of a porous sealing member to form a foamed layer, the interface between the member surface and the foamed layer is integrated, and therefore both The adhesion is strong, and even if the sealing material is bent or bent, the foam layer absorbs the distortion caused by deformation, so no water grooves are formed and good waterproof properties can be obtained over a long period of time. have

<Example> Below, one example of the present invention will be shown. In the text, 1 part or % means part by weight or % 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 was mixed and stirred with a mechanical stirrer to foam approximately 3 times the volume, and this was foamed to a foaming ratio of approximately 3.
It was applied directly to the sliced surface of 101 m thick ether-based polyurethane foam using a doctor knife to a thickness of about 100 μm, preheated at about 80°C for 1 minute, and then heated at about 140°C for 1 minute. The coated layer was crosslinked by heating between sections to obtain a seal material having a coated foam layer on the sliced surface with a thickness of about 100 μm.

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 carboxymethylcellulose 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 and the above mixture were mixed with a mechanical stirrer. Mix and stir to foam approximately 5 times, and add ethylene-
Propylene terpolymer and Cal carbonate:, /:x')f)
Thickness 3 made by sulfur vulcanization of the mixture with J- and foaming to seven times the size.
Approximately 2000μ on the sliced surface of raw rubber foam
Apply directly using a doctor knife so that it has the thickness of the groove, and then apply it to the sliced surface in the same manner as in Example 1.
A sealing material having a coating foamed IN having a thickness of 00 μm was obtained.

Example 3 A blend of 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 was prepared for rubber. After kneading in a Banbury mixer, toluene was added to give a viscosity of 10,000 CPS (at
20° C.) to obtain a solution with a solids content of 50%.

The solution was applied to the sliced surface of the rubber foam of Example 2 at a rate of 100%.
The sealant was directly applied to a thickness of 0 μm and heated at 170° C. for 10 minutes to heat and foam the applied layer to obtain a sealing material having a foamed layer of about 1200 μm thick on the sliced surface.

Example 4 A mixture consisting of 100 parts of polyvinyl chloride, 80 parts of dioctyl phthalate, 2 parts of dichloride lead phosphite, and 3 parts of silicone oil was mixed and stirred using a mechanical stirrer to foam approximately three times as much. Is this an example? It was applied directly to the sliced surface of the urethane foam using a doctor knife so as to have a groove thickness of 500μ, and heated at 190°C for 10 minutes to obtain a sealing material having a coating foam J- of about 500μ per slice. Ta.

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 Aqueous ammonia (solid content 35%) ) Expanded hollow microspheres consisting of two parts avalylonitrile (particle size 60-150μ
Viscosity 15 consisting of 3 parts of the above formulation
A solution of 000 CPS (at 20° C.) was applied directly to the sliced surface of the rubber foam of Example 2 to a thickness of 200 μm using a doctor knife, and heated at 120° C. for 10 minutes.

A sealing material having a coated foam layer with a specific gravity of 0.5 on the sliced surface was obtained.

Table 1 shows the characteristics evaluation results of Examples 1 to 5.

Comparative Example 1 in Table 1 is the polyurethane foam t-A of Example 1.
In Comparative Example 2, the rubber foam of Example 2 was used as a sealing material.

The measurement method in Table 1 is as shown in FIG. 1 and FIG. Examples 1 and 2 are on one side only)
A butyl rubber-based adhesive layer 2 with a thickness of 0.3 m is provided by a conventional method and adhered to the surface of a glass plate 3 with a curvature of 100 m H, and a glass plate 3' is superimposed on it, not shown. Example 1.4 and Comparative Example 1 were prepared using the same jig.
Compressed to 0%, Examples 2, 3.・5 and comparative example 2 are 5
A measurement tool was created by compressing it to 0%, and water was injected into the cavity made of sealing material to a depth of 100fi.

The presence or absence of water capture from the interface between the sealing material and the glass plate 3 was observed at predetermined intervals.

Table 1 The evaluation in Table 1 is as follows: ○ indicates that no water leakage is observed, △ indicates that slight water leakage is observed, and × indicates that water leakage is clearly observed.

[Brief explanation of the drawing]

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 line I-I'. 1... Seal material 4... Coated foam layer Figure 1 2wJ 2--Glue 1 groove 3.3'-11 tidal spring plate 4--"! Installation procedure amendment 1986 June 8th 1, Indication of the case Patent Application No. 46280 of 1988 2, Name of the invention Seal material 3, Person making the amendment Relationship to the case Patent applicant postal code 567 4, Date of procedural amendment order 1988 On May 26, 5, the name of the invention subject to amendment is amended from "Sealing material" to "Sealing material."that's all

Claims (1)

[Scope of Claims] 1) A sealing material comprising a coated foam layer provided on at least one surface of a porous sealing member with a rough surface that exhibits waterproof properties when compressed. 2) The sealing material according to claim 1, wherein an adhesive layer is provided on one surface.