KR100374489B1 - The environment-friendly pipe for prevention of noise - Google Patents

Abstract

The present invention relates to a multilayer piping material comprising an environmentally friendly polyolefin resin layer reinforced with a mineral aggregate and a thermoplastic elastomer layer having a noise absorption function.

More specifically, the present invention is to enhance the physical and mechanical strength by reinforcing a variety of mineral aggregates suitable for the molecular structure of the polyolefin resin to be used as a drainage pipe in and out of the building, and at the same time, to further attenuate drainage noise. The use of elastomers as sound absorbing layers provides an environmentally friendly piping material that perfectly absorbs the drainage noise of pipes without the need for additional processes such as sound insulation.

Description

Environment-friendly pipe material with noise absorption function

The present invention relates to a multilayer piping material comprising an environmentally friendly polyolefin resin layer reinforced with a mineral aggregate and a thermoplastic elastomer layer having a noise absorption function.

More specifically, the present invention is more environmentally friendly than PVC pipes by reinforcing glass fibers and carpets in polyolefin resins or by reinforcing mineral aggregates of glass fibers, glass beads, barium sulfate, calcite, silica, kaolin, kalks and potassium carbonate. By using a thermoplastic elastomer as a sound absorbing layer to attenuate the drainage noise while having physical and mechanical strength, high flexural strength, flexural modulus, tensile strength, heat deformation temperature, abrasion resistance and dimension resistance. It relates to a piping material to completely absorb the noise generated during the discharge of sewage.

PVC pipes are widely used as piping materials inside and outside buildings that discharge sewage. This is because PVC pipe is cheaper than other products and has high physical and mechanical properties. However, environmentally harmful substances such as dioxins, environmental hormones and chlorine gas generated during processing of PVC resin products are harmful to the environment and the human body. As concerns arise, urgent development of such substitutes is required.

Under the above circumstances, household goods and home appliances among PVC resin products were almost replaced by polyolefin-based polypropylene, polyethylene products and ABS products which do not cause environmentally harmful components.

However, polypropylene and polyethylene resins cannot exhibit impact strength, tensile strength, high thermal deformation temperature and high hardness at the same time. Therefore, a suitable substitute for PVC pipes used for sewage and drainage pipes inside and outside the building is required. There is a problem that can not be, and ABS resin also has a problem that is not suitable to spread in large quantities due to too high production cost and manufacturing cost compared to conventional PVC products.

Accordingly, the present inventors in the application No. 10-2000-0033757 application made of the same as the present application, by reinforcing the mineral aggregate suitable for the molecular structure of the polyolefin resin, by strengthening the low physical and mechanical strength which is a problem of the polyolefin resin inside and outside the building Introduced the invention of environmentally friendly pipes that can be used for water supply and wastewater piping.

That is, according to the present application of the present inventors, when synthesizing glass fibers and carpets to environmentally friendly polyolefin resin, or synthetic materials such as glass beads, barium sulfate, calcite, silica, kaolin, calc, potassium carbonate, High flexural strength, flexural modulus, tensile strength, heat deflection temperature, abrasion resistance, and dimensional resistance over pipes maximize the physical and mechanical properties of sewage and drainage pipes inside and outside the building while maintaining the advantages of environmentally friendly polyolefin resins. Piping materials with properties can be obtained.

The present invention relates to a drainage pipe which adds a sound absorbing function to a further step in the present invention, and in addition to maintaining the high physical and mechanical properties and environmental friendliness of the present invention, a thermoplastic elasto having a sound absorbing function. The present invention relates to a multi-layer piping material added with a layer.

In general, the pipe for discharging sewage, etc., is formed of a cylindrical straight pipe (1) to have a constant thickness using a reinforced PVC, as shown in Figure 1, the pipe joint pipe connecting the straight pipes ( 2) is manufactured in various shapes. As an example, a pipe fitting 2 is shown in FIG. 2.

However, the above-mentioned straight drain pipes or pipe fittings have a noise generated as the sewage hits the wall of the drain pipe while the sewage is discharged for the purpose. This occurs and is transmitted to the outside. In addition, when the noise is continuously generated, it causes noise pollution to residents living for a long time indoors and adversely affects the human body.

Therefore, efforts to reduce the drainage noise of pipes have been made in the past, and companies that construct drainage pipes use a kind of noise absorber such as asbestos to reduce the noise such that the noise leaks to the outside. Has been used.

However, this approach not only undermines the aesthetics of the entire building, it also creates environmental problems and never provides a good sound absorption or soundproofing role, creating a burden on construction costs due to additional materials.

Therefore, there is an urgent need for a product that can obtain a noise damping effect within a range that does not increase the original thickness of the pipe and does not increase a separate production cost and manufacturing cost.

The present invention has been made to solve the above problems, an object of the present invention to reinforce various physical aggregates suitable for the molecular structure of the polyolefin resin to enhance the physical and mechanical strength to be used as a drainage pipe inside and outside the building. At the same time, the use of a thermoplastic elastomer as a sound absorbing layer to further attenuate the drainage noise provides an environmentally friendly piping material that completely absorbs the drainage noise of the pipe without the need for additional processes such as sound insulation installation. .

1 is a cross-sectional view showing a conventional straight pipe

Figure 2 is a cross-sectional view showing a conventional pipe joint

Figure 3 is a cross-sectional view and an exploded view showing the structure of one embodiment of the present invention

4 is a cross-sectional view and an exploded view showing the structure of another embodiment of the present invention.

Figure 5 is a cross-sectional view and an exploded view showing the structure of another embodiment of the present invention

*** Explanation of symbols for main parts of drawing ***

1 straight pipe 2 pipe fitting pipe

3: polyolefin layer reinforced with mineral aggregate

4: thermoplastic elastomer layer 5: air layer

6: protrusion

In order to achieve the above object, the present invention is made of an elastomer for an environmentally friendly piping material having a polyolefin resin layer reinforced with a mineral aggregate as introduced in the present application No. 10-2000-0033757 The noise absorbing layer was added, and it was confirmed that the two objectives of eco-friendliness and noise reduction could be achieved simultaneously.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

The present inventor considered the thermoplastic elastomer as a material of the noise absorbing layer to prevent the drainage noise due to the flow of the fluid from escaping out of the pipe. This may be a material that can effectively absorb sound, such as a sponge, as an internal material of the noise reduction pipe, but when a sponge or a soft material having a similar property is used, it may be dissolved in soapy water mixed in sewage, The thermoplastic elastomer is not only excellent in weather resistance, chemical resistance, ozone resistance, fatigue resistance, heat resistance, oil resistance, etc., but also excellent in viscoelasticity according to frequency.

The experimental results show that the elastomer can reduce noise by absorbing or dissipating a large part of the energy stored in the material.

The sound absorption capacity of such elastomers is compared using tan δ, which represents the ratio of the amount of energy dissipated in the maximum energy stored in the material, and is then identified from the contents of Table 1.

Figure 1. Different types of noise with varying frequencies

It can be seen from the above diagram that the thermoplastic elastomer has high viscoelasticity, that is, excellent sound absorption ability, for a wide range of frequencies. Therefore, in the state where the above-mentioned sound absorbing ability of the elastomer layer is confirmed, the elastomer layer may be applied to the method of bonding the noise absorbing layer of the thermoplastic elastomer, that is, the polyolefin composite material region containing the mineral aggregates responsible for load. How to combine them will be a major concern.

First, as a first embodiment, as shown in Fig. 3, the outer wall of the pipe is a polyolefin layer 3 reinforced with mineral aggregates, and the inner wall is formed of a thermoplastic elastomer layer 4. All are available.

In this case, the elastomer layer 4 completely absorbs the energy of sound propagating through the pipe and can lower the sound pressure, which is the cause of the noise, decisively. In addition, the polyolefin composite material layer 3 and the thermoplastic elastomer layer 4, in which the mineral aggregates are reinforced, are both polyolefin-based, and it can be seen through experiments that they are well bonded during molding.

Since the sewage and drainage pipe has various standards, the present inventors experimented with noise transmission based on a pipe having a diameter of 100 mm and a thickness of 3.5 mm, and as a result, data as shown in Table 2 was obtained.

Table 2. Transmittance Comparison Based on PVC

The diagram above relates to the calculation of the preferred thickness of the thermoplastic elastomer layer combined with the polyolefin layer reinforced with mineral aggregates, assuming that the noise absorption rate of a conventional 3.5 mm thick PVC pipe is assumed to be 1 (straight line in the horizontal direction). Transmittance was investigated when a thermoplastic elastomer layer was added to the inner wall of a pipe made of a polyolefin layer reinforced with mineral aggregates.

In other words, the transmittance was examined while the thickness of the thermoplastic elastomer layer was sequentially changed from 0 to 3.5 mm while maintaining the sum of the thicknesses of the polyolefin layer and the thermoplastic elastomer layer to be 3.5 mm. Here, each number described on the Y-axis represents the transmittance according to the thickness change of the thermoplastic elastomer layer bonded to the polyolefin layer with respect to the transmittance when the PVC has a 3.5 mm thickness as a relative ratio.

In the above experiments, it was found that the transmittance gradually decreased as the thickness of the thermoplastic elastomer layer bonded to the polyol pephine resin layer reinforced with the mineral aggregate becomes thicker. In other words, when the thickness of the elastomer layer bonded to the polyolefin resin layer is near 0.5 mm, the transmittance is about the same as that of PVC, and when it is more than that, the transmittance gradually decreases.

Therefore, the thicker the elastomer layer would be better if you only consider noise reduction. However, if the thickness exceeds a certain thickness, it will not bring about a substantial increase in effect, and the industrial availability or economic feasibility according to the production cost will be considered. In conclusion, it was analyzed that it is reasonable to determine the thickness of the thermoplastic elastomer layer between about 0.3 mm and 3 mm.

On the other hand, the drainage pipe may contain contaminants that may damage the noise absorbing layer of the thermoplastic elastomer in the fluid flowing in the pipe, depending on its use.

In order to overcome such a possibility of damage, as in the second embodiment of Fig. 4, the area of the pipe wall is composed of three layers, the inner wall of which is the polyolefin composite material region 3 having the mineral aggregate reinforced, and the intermediate layer is thermoplastic. It is preferable to use the elastomer 4 and the outer wall again as the polyolefin composite region 3 in which the mineral aggregate is reinforced.

Of course, the product can be molded in many layers, but due to the natural production cost and the increase in manufacturing cost, it is not only a burden to replace the current PVC pipe, but also the noise of the three-layer structure formed as described above. Since the degradation in performance due to the damage of the absorbent layer can be sufficiently prevented, it is best to configure the above three layers even when the fluid flowing in the pipe contains contaminants that can damage the noise absorbing layer of the thermoplastic elastomer. desirable. In this case, the thickness of each elastomer layer can be made somewhat thinner than in the case of the two-layer structure, which can of course be changed somewhat in consideration of economy and functionality.

The last embodiment of the present invention is to form a thermoplastic elastomer layer in the middle of the polyolefin layer of the outer wall and the inner wall reinforced with the mineral aggregate, and further by providing a separate air layer to obtain a more perfect drainage noise suppression effect. As an example, as shown in FIG. 4, when the pipe wall has three layers, the air layer 5 is additionally shown in FIG.

At this time, the air layer 5 may be placed on either side or on both sides of the center of the elastomer layer. In order to put the air layer in this way, the polyolefin layer or the elastomer having the air layer therebetween is provided. A protrusion 6 is formed on either side of the layer to support it. FIG. 5 shows a case in which the air layer is formed on one of the elastomer layers, and the protrusions 6 are formed on the thermoplastic elastomer layer.

Such a coupling method has the effect of minimizing damage to the absorbing material and at the same time suppressing the increase in the sound pressure more effectively to obtain a sound absorbing effect for a wider frequency range.

As described above, by using a thermoplastic elastomer as a noise absorbing layer or additionally installing an air layer in the polyolefin resin reinforced with mineral aggregates, it is environmentally friendly and has physical and mechanical strength above PVC pipes, It is possible to completely absorb the noise generated during the discharge.

In particular, on the sound absorbing surface, it is possible to have the same effect as embedding the sound insulation in the general drainage pipe without the need of embedding the sound insulation on the outside of the pipe during plumbing construction. It can be manufactured to have, and further lower the manufacturing cost.

Claims (8)

In the piping material for sewage and drainage inside and outside the building made of polyolefin resin, the polyolefin resin is reinforced with glass fibers and a knife, and an environmentally friendly noise layer is formed inside the drain pipe to reduce noise. Reducing Piping Materials. In the piping material for sewage and drainage inside and outside the building composed of polyolefin resin, the polyolefin resin is reinforced with mineral aggregates of glass fiber, glass beads, barium sulfate, calcite, silica, kaolin, calc and potassium carbonate, and inside the drain pipe. Environmentally friendly noise reduction piping material is characterized in that the elastomer layer for noise reduction is formed. The environmentally friendly noise reduction piping material according to claim 1 or 2, wherein the thickness of the elastomer layer is 0.3 mm to 3 mm based on a 3.5 mm thickness piping material. The environmentally friendly noise reduction according to claim 1 or 2, wherein an additional layer of polyolefin reinforced with mineral aggregates of glass fibers and knifes is formed inside the elastomer layer. Plumbing materials The pipe wall according to claim 1 or 2, further comprising a polyolefin layer reinforced with mineral aggregates of glass fibers, glass beads, barium sulfate, calcite, silica, kaolin, calc and potassium carbonate inside the elastomer layer. Environmentally friendly noise reduction piping material, characterized in that the area consists of three layers. The environmentally friendly noise reduction piping material according to claim 1 or 2, further comprising an air layer supported by a protrusion between the elastomer layer and the polyolefin layer reinforced with the mineral aggregate. The environmentally friendly noise reduction piping material according to claim 4, further comprising an air layer supported by the protrusion between the elastomer layer and the polyolefin layer reinforced with the mineral aggregate. The environmentally friendly noise reduction piping material according to claim 5, further comprising an air layer supported by the protrusion between the elastomer layer and the polyolefin layer reinforced with the mineral aggregate.