JPH0533600Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is suitable for underground passages, tunnels, public ditches, water and sewerage systems,
Water stop seals for joints and joints of culverts, underground structures, embankments, waterways, water conservancy structures, humid pipes, and other pipes through which water flows, and water stop seals for joints and joints of various other devices and structures. This invention relates to a hot melt sealing material formed into a string or band shape that can be applied to seals, etc.

More specifically, the present invention relates to a hot-melt sealing material in which a sealing base made of an elastic hot-melt molded into a string or band shape as a whole is imparted with water-absorbing expandability and has a string-like core material built therein.

The purpose of this invention is that by inserting a core material, it can be installed without stretching during construction, and since it is a hot melt, it adheres quickly, making it easy to install, and after installation, it has elasticity and maintains a constant shape. To provide a hot melt sealing material formed into a string or band shape, which can be used to seal joints, joints, etc. more effectively due to its water absorption and expansion properties.

Another object of the present invention is that by incorporating a string-like core material in the sealing base that can ensure the thickness of the sealing base, it is possible to prevent joints and structures in the lower part of humid pipes, etc. Even if a large load is applied to the sealing base and the sealing base is compressed when used for joints at the bottom of
Due to the presence of the string-like core material inside the sealing base, it is possible to ensure a width greater than the specified thickness, so the string-like core material can be sufficiently sealed without the sealing base being destroyed or extruding due to compression. The present invention provides a hot melt sealing material formed into a band shape.

To explain the present invention with reference to the illustrated embodiment, FIG. 1 is a perspective view showing a partially cut away hot melt sealing material formed into a string according to the present invention. FIGS. 2 and 3 show cross-sectional views of other embodiments, respectively. FIG. 4 is a sectional view showing an example in which stone powder or the like is applied to the surface of the molded hot melt sealing material of the present invention to prevent adhesion. Figure 5 shows
FIG. 2 is a sectional view showing an example of a molded hot melt sealing material of the present invention in which a release sheet is attached to prevent adhesion on the surface.

In the figure, 1 is a string-like core material that does not melt when heated by a hot melt gun, burner, or the like. 2
is a sealing base made of rubber containing a super absorbent resin that forms an elastic gel when swollen in water, and a thermoplastic polymer that has elasticity and can maintain a certain shape. It is made of a mixture that has the property of melting by heating with a hot melt gun, burner, etc., and the property of expanding by absorbing water, and is formed into a string or band shape. The sealing base 2 covers and connects the string-like core material 1. That is, a string-like core material 1 is built into a sealing base 2, and together they form the string- or band-shaped hot melt sealing material of the present invention. The string-like core material 1 is made of a material that does not melt even when heated by a hot melt gun or burner required to hot melt the sealing base 2, is resistant to tension, is difficult to stretch, and is resistant to pressure from the sides. Those with excellent quality are used. For example, metal wire, metal fiber, asbestos, glass fiber, natural fiber, semi-synthetic fiber,
String-like, wire-like, rope-like materials made of synthetic fibers, carbon fibers, plastics, etc., as well as vulcanized rubber strings, etc., are also used.

The mixture of rubber, thermoplastic polymer, etc. containing a super absorbent resin, which constitutes the sealing base 2, will be explained.

A super absorbent resin is a polymer that has high water absorbency and can absorb a large amount of water (for example, water several hundred times its own weight), and swells in water to form a hydrogel. This gel has elasticity and does not break easily even when pressure is applied, and does not release absorbed water.
When this water-absorbed and swollen gel is naturally or forcedly dried, it has the property of returning to its original shape. Among the super absorbent resins blended (mixed and dispersed) with rubber or thermoplastic polymers, those that have elasticity can be given water absorption and swelling properties by utilizing the water absorption and swelling properties of the super water absorbent resin.

Super absorbent resins include, for example, hydrolysates of starch/polyacrylonitrile graft polymers, starch/polyacrylic acid graft polymers, crosslinked carboxymethyl cellulose, vinyl acetate/
Saponified acrylic ester copolymer, crosslinked polyacrylate, crosslinked polyacrylonitrile hydrolyzate, polyvinyl alcohol maleic acid copolymer, isobutylene/maleic acid copolymer, vinyl acetate/unsaturated dicarboxylic acid copolymer There are polymers, polyethylene oxide crosslinked products, and partially crosslinked water-soluble polymer substances, and any of them can be used.

Examples of the rubber and thermoplastic polymer used in the mixture include the following.

Natural rubber, isoprene rubber, styrene-butadiene rubber, styrene-isoprene rubber, butadiene rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber, nitrile rubber, chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber,
Ethylene/propylene rubber, isobutylene rubber,
Urethane rubber, styrene/butadiene block polymer rubber, styrene/isoprene block polymer rubber, styrene/isoprene/butadiene block polymer rubber, ethylene/vinyl acetate copolymer, ethylene/vinyl alcohol copolymer, ethylene/acrylic acid Examples include ester copolymers, polyvinyl acetate, soft polyvinyl chloride resin, and polyurethane. These may be used alone or in combination of two or more.

The following materials can be appropriately blended into the above-mentioned rubber and thermoplastic polymer.

One or more of bituminous materials, natural or synthetic resins, liquid rubber, process oils, mineral oils, plasticizers, fats and oils, softeners, etc., as well as pigments, fillers, anti-aging agents, antioxidants, coupling agents, and dispersants. , crosslinking agents, vulcanizing agents, etc.

Rubbers containing super absorbent resins and mixtures of thermoplastic polymers can be made by kneading them using rubber kneading rolls, mixers, etc., and can also be made by mixing them with a small amount of high-molecular substances such as rubber. After heating and melting the components except for the super absorbent resin and mixing them, the super absorbent resin can be mixed and dispersed together with the filler and the like. The approximate blending ratio is 100 parts (by weight, the same applies below) of rubber, thermoplastic polymer, etc. to 100 parts (parts by weight, the same applies hereinafter) of bituminous materials, resins, liquid rubber, process oils, mineral oils, plasticizers, fats and oils, softeners, etc. The content ranges from 0 to 300 parts of a tackifier or softener, from 10 to 100 parts of a superabsorbent resin, and from 40 to 200 parts of pigments, fillers, additives, and the like.

Rubber blended with super absorbent resin and mixtures of thermoplastic polymers are elastic at room temperature, can maintain a certain shape, and have the property of absorbing water and swelling and melting when heated. It can be formed into pellets, strings, strips, plates, etc. The sealing substrate of the present invention is formed by molding a mixture of rubber and thermoplastic polymer blended with this super absorbent resin into a string or band shape using an extruder or the like.

The sealing base of the present invention can be manufactured with various cross-sectional shapes. Generally, shapes such as a circle, an oval, a semicircle, a triangle, a quadrangle, a rectangle, and a trapezoid are used. It is then supplied in the form of a roll, such as a rope or noose, or cut into a certain length. Furthermore, depending on the formulation, pressure-sensitive adhesive properties can be imparted to the surface of the sealing substrate. Depending on the formulation, stone powder 3 may be applied to the surface of the sealing substrate as shown in FIG. 4, or a release sheet 4 may be applied as shown in FIG. 5, in order to prevent the sealing substrate from sticking during storage and handling. You can also add .

When using the string- or band-shaped hot melt sealant of the present invention, apply a primer to the areas to be sealed, such as joints, joints, seams, etc., and then apply the formed hot melt sealant. is adhered to the primer coated surface while melting the sealing base using a hot melt gun or the like (it is possible to melt the entire surface, but it is also possible to melt only the surrounding area). Alternatively, the molded hot melt sealant can be heated with a burner or the like to bond it. If the area to be sealed is wide, it is sufficient to use two or more string- or band-shaped hot melt sealants instead of sealing with one. The molded hot-melt sealing material of the present invention is a hot-melt material, so it adheres quickly even on ceilings and raised areas, so it can be easily and reliably sealed.
Further, since the molded hot melt sealing material of the present invention is hot melt, it has good adaptability to the area to be sealed (substrate), so the seal is reliable. Further, since the molded hot melt sealing material of the present invention is a hot melt, the surface of the sealed area can be smoothed using a burner, a trowel, etc.

The molded hot melt sealant of this invention is
Because it has a core material that does not melt when heated with a hot melt gun, burner, etc., the sealing base is heated with a hot melt gun, burner, etc. during installation.
Even if it is melted, it will not stretch, so it can be sealed accurately and is easy to install.

In this manner, the molded hot-melt sealant of the present invention has good workability and adhesion, and can provide a good seal. In addition, it has water absorption and expansion properties, so when water flows into these areas after sealing joints, joints, seams, etc., it expands due to water absorption, expanding the gaps between joints, joints, seams, etc., and creating pressure. Since it is sealed in a still-tight state, watertightness is maintained.
The water seal becomes more reliable. It has excellent practical benefits such as

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the molded hot melt sealing material of the present invention. Figure 2~
FIG. 3 is a sectional view showing an embodiment of the present invention, and
FIGS. 4 and 5 are cross-sectional views showing an example in which stone powder is applied to the surface of the molded hot melt sealing material of the present invention and an example in which a release sheet is applied to the surface, respectively. In the figure, 1 is a string-like core material, 2 is a sealing base, 3 is stone powder, and 4 is a release sheet.

Claims (1)

[Scope of utility model registration request] Rubber containing a super absorbent resin that forms an elastic gel when swollen in water, and a thermoplastic polymer that has elasticity, can maintain a certain shape, and expands when it absorbs water. A sealing base is formed into a string or band shape using a mixture that has the property of melting when heated with a hot melt gun, burner, etc., and a string-like material that does not melt when heated with a hot melt gun, burner, etc. is inserted into the sealing base. A molded hot melt sealant characterized by having a core material inside.