JPS6136840Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used for joints of pipes that require watertightness such as water pipes and sewer pipes, and joints for structures such as culverts that require watertightness and waterproofness. This invention relates to an elastic molded sealant.

Rubber annular packing material is usually used to seal water at the joints of sewer pipes buried underground. That is, an annular packing material is inserted in a compressed state into the gap between the joint parts, and the restoring force based on the elasticity of the packing material closes the gap in the joint parts to stop water. However, when using this method, if the packing becomes loose due to misalignment of the pipe or packing material when connecting the pipe bodies, or if there are protrusions or foreign objects on the surface of the joint part of the pipe body, the packing material may become loose. There was a risk that the watertightness would be reduced because the sufficient contact needed for watertightness could not be achieved, and that the packing material might be damaged during use due to friction or fatigue due to aging, resulting in a reduction in watertightness. To improve watertightness, a hollow tube-shaped rubber packing material is inserted into the joint of the pipe, and air, liquid, or other injection material is pressurized into the hollow part and the packing material is expanded. A method has also been implemented in which the gap in the joint is closed and watertight.

This method improves watertightness because the expanded surface of the rubber packing material and the contact surface of the tube come into contact under pressure, but there are no protrusions or depressions between the surface of the packing material and the contact surface of the tube. If there is, the watertightness of that area will not be complete. Furthermore, since the surface of the packing material does not have adhesive properties, it tends to move toward the space when it is expanded, and there is also a risk that it may move during use. Furthermore, since frictional force and shear force act directly on the surface of the packing material during use, it is susceptible to aging and fatigue and has the disadvantage of accelerating breakage of the packing material.

The present invention eliminates the above-mentioned drawbacks and provides an elastic molded sealing material that can be used in pipe joints and structural joints that require watertightness to create durable joints with excellent watertightness. The purpose is to provide

In the present invention, a base made of an elastic molded packing material is formed into an annular shape, the base is made hollow, and a base 3 is provided so that the hollow part communicates with the outside air. The gist of the invention is an elastic molded sealant characterized by having a pressure-sensitive adhesive layer provided on its surface.

Embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows one example of the elastic molded sealant of the present invention.
FIG. 2 is a front view showing the embodiment, and FIG. 2 is a longitudinal side view as well. FIG. 3 is a longitudinal side view illustrating the cross-sectional shape of the elastic molded sealing material of the present invention, and FIG. 4 is a longitudinal side view showing the state in which it is used as a pipe joint.

In the figure, reference numeral 1 denotes a base made of an elastic molded packing material, which is formed into an annular shape and has a hollow portion 2 at its core. The base material 1 is made of vulcanized rubber made of natural and/or synthetic rubber, polyethylene,
Polypropylene, polyvinyl chloride, polyvinylidene chloride, polyurethane, ethylene/vinyl acetate copolymer, ethylene/acrylate copolymer,
It is a molded packing material that has moderate elasticity and hardness and is made mainly from a material selected from fluororesin. A base body 1 is provided with one or several caps 3 for injection and exhaust so that its hollow portion 2 communicates with the outside air. A member 4 such as a valve, a stopper, a protection tube, etc. can be attached to the cap 3. Further, the annular shape forming the base body 1 can be circular, oval, rectangular, or any other shape depending on the pipe or culvert to be used. The cross-sectional shape obtained by cutting the annular portion of the base 1 from the direction perpendicular to the ring can be of various shapes such as circular, oval, and square. It can also take on a variety of shapes, such as having unevenness around the outside, comb-shaped entrances and exits, concave grooves, and lips.

A pressure-sensitive adhesive adhesive layer 5 is provided on the entire or part of the outer surface of the base 1 in a continuous annular shape along the annular shape of the base 1 .

The pressure-sensitive adhesive adhesive layer 5 has pressure-sensitive adhesive properties and self-fusion properties, and does not leak out due to high temperatures or sunlight in summer.
It is composed of an elastic mixture that has heat and cold resistance to the extent that it does not become brittle at low temperatures in winter. This elastic mixture is generally made of a polymeric elastomer (e.g., natural rubber, synthetic rubber, recycled rubber, chlorinated rubber, ethylene/acrylate copolymer, ethylene/vinyl acetate copolymer, polyethylene, polypropylene) for imparting elasticity. , polyvinyl chloride, vinyl chloride copolymers, etc.) and resins for imparting adhesiveness and tackiness (e.g., ester gum, rodin derivatives, terpene resins, coumaron resins, phenolic resins, petroleum resins, alkylene resins, synthetic resins) terpene resins, polybutene, polybutadiene, etc.), synthetic oils, mineral oils, process oils, plasticizers, pigments, fillers, etc.
It is made by mixing anti-aging agents, etc., and there are many types. Some of the most common ones are those based mainly on butyl rubber, polybutene, and terpene resin, those based mainly on rubber, asphalt, and adhesive resin, and those based mainly on acrylic resin. There are things like that.

The pressure-sensitive adhesive layer 5 is attached to the entire outer surface or a part of the outer surface of the substrate 1, and the cross-sectional shapes of several examples are shown in FIG. In addition, a release sheet such as release paper, polyethylene film, or vinyl film may be applied to the surface of the pressure-sensitive adhesive layer 5, or powder may be applied to prevent sticking during handling. It can also be used by peeling it off or powdering it.

When using the elastic molded sealant of the present invention, the elastic molded sealant is inserted into a predetermined position of a joint such as a pipe culvert to connect the pipes or culverts. Next, a method is used in which the injection material is injected under pressure into the hollow part 2 through the base 3 and sealed. Injection materials include reactive hardening resins, rubber, grouting materials, hydraulic materials such as cement and plaster, bituminous materials, mineral oil, water, gaseous bodies, air, etc., as well as aggregates and fillers added to these materials. A variety of things can be used.

The fourth example of the use of the elastic molded sealant of this invention is shown below.
The explanation will be given by taking the collar joint of the pipe shown in the figure as an example.
In the figure, 6 is the end of the tube, 7 is the collar, and 8 is the collar 7.
The inner rim 8 of the rim 8 forms a concave groove 9. There are one or two holes 10 in the groove 9 of the collar 7. The base 3 of the elastic molded sealant is inserted into the hole 10 of the collar 7, and the base 1 is set in the groove 9. Then, a member 4 such as a valve, a stopper, a protection tube, etc. is attached to the tip of the cap 3. The base 1 of elastic molded sealant adheres well to the collar 7 via the pressure-sensitive adhesive layer 5.

Next, after inserting the tube ends 6, 6 inside the collar 7 and connecting both tubes, injection material is injected under pressure into the hollow part 2 of the elastic molded sealing base 1 through the base 3, and the elastic molded sealing base 1 is expanded. After that, close the cap 3. Due to the expansion of the elastic molded sealing base material 1, the surface of the base body 1 is pressed under pressure against the surfaces of the collar 7 and tube ends 6, 6 which are in contact with it.
Then, due to the pressure-sensitive adhesive layer 5, they are watertightly bonded without any gaps. The protruding pressure-sensitive adhesive layer 5 covers the outside of the base 1 and seals the contact surface between the base 1 and the collar 7 with the tube ends 6, 6. Thus, it maintains watertightness and protects the base 1 doubly. Furthermore, when the injection material is injected under pressure into the hollow part 2 of the elastic molded sealing base 1, the base 1 can expand evenly due to the coverage and adhesive strength of the pressure-sensitive adhesive layer 5, and it is less likely to flop out. Become. It also protects the substrate 1 from mechanical damage caused by friction, shearing, etc., as well as aging caused by oxidation, water, chemicals, etc.

Since the elastic molded sealing material of the present invention is constructed as described above, when used in pipe joints, etc., it blends well with the surface of the pipe due to the pressure-sensitive adhesive layer on the surface and can be bonded without any gaps. Next, the injection material is injected under pressure into the hollow part to expand the base material, and when the injection material is cured or sealed in this state, the surface of the base and the surface of the tube come into contact, and the pressure-sensitive adhesive adheres to the surrounding area. Since the base body and the pipe body are sealed watertightly and connected, the watertightness is completely achieved. Moreover, it can adapt to the movement of the tube in a watertight state due to the elastic pressure-sensitive adhesive properties of the base and the adhesive layer, and can also absorb shocks such as earthquakes and shocks. In addition, the pressure-sensitive adhesive layer prevents the elastic molded sealing substrate from being damaged and aged due to repeated stress such as friction and shearing, so it has excellent durability and other practical benefits.

[Brief explanation of the drawing]

Figure 1 shows one example of the elastic molded sealant of the present invention.
A front view of the embodiment, FIG. 2 also shows a longitudinal side view, and FIGS. 3 a to 3e each show a longitudinal side view of the embodiment of the elastic molded sealing material of the present invention. FIG. 4 shows a longitudinal side view when the elastic molded sealing material of the present invention is used in a pipe joint. 1 is a base material, 2 is a hollow part, 3 is a cap, 4 is an attached part of the cap, 5 is a pressure-sensitive adhesive layer, 6 is a tube end,
7 is the collar, 8 is the rim, 9 is the groove, and 10 is the hole.

Claims (1)

[Scope of utility model registration request] A base material made of an elastic molded packing material having elasticity and hardness is formed into an annular shape, the annular base material is made hollow, and a cap is provided so that the hollow part communicates with the outside air, and a pressure sensitive material is formed on the outer surface of the base material. An elastic molded sealant characterized by having an adhesive adhesive layer.