KR200338816Y1 - Non-woven fabric tube for reinforcing deteriorated water supply and drainage pipe - Google Patents

Abstract

The present invention relates to a circular nonwoven tube impregnated with a thermosetting resin for repairing old water and sewage pipes, and is an integral circular nonwoven tube applying a needle punching method so that there is no protrusion even by overlapping, and as a resin to be impregnated into the circular nonwoven tube By using one-component high-temperature hardening resin that can be stored for a long time even at room temperature and high temperature, it is not necessary to purchase or maintain a refrigeration vehicle separately, and it is possible to extend the pot life without having to transport resin mixture or impregnation facility to the site, and high strength bending strength It is to provide a nonwoven tube for reinforcing old water and sewage pipes that can be expressed.

Description

Non-woven fabric tube for reinforcing deteriorated water supply and drainage pipe}

The present invention relates to a nonwoven tube for reinforcing old water and sewage pipes. More specifically, after forming the flat nonwoven fabric in a circular shape, joining both sides, but using a needle punching method, there is no protruding portion, and the resin can be stored for a long time as the resin to be impregnated in the circular nonwoven fabric, and the curing reaction only at a high temperature. The present invention relates to a nonwoven tube suitable for reinforcing or repairing old water and sewage pipes by extending the pot life by using the one-component high-temperature hardening resin that is advanced, and also exhibiting high strength flexural strength.

In general, the nonwoven fabric is mechanically entangled with natural fibers and chemical fibers without undergoing a woven process such as woven or knitted fabric to form a sheet-shaped web, and then bonded with a synthetic resin binder or needle punched by a mechanical method. It is a generic term for planar products made by entanglement without binder by needle punching, or by using heat melting of the fiber itself. However, the binder bonding method and the hot melt bonding method have a smell, complex facilities such as an adhesive injection facility and a press plate are complicated, and the thermal melting method requires additional facilities such as an electric facility and an oven, and it is difficult to perform sophisticated work of the seam. There is.

This nonwoven fabric has been used as a main material in the fabrication of conventional round tubes. Normally, the production of nonwoven fabric in a factory is produced in a flat plate, when manufacturing a circular tube for reinforcing circular old water and sewage pipes, the flat plate nonwoven fabric is rolled in a circle, as illustrated in FIG. The overlapped portion has been treated with a thread and then used as it is, or the overlapped portion has been treated with adhesive and then taped to the inner and outer seams of the overlapped portion.

However, when stitching with a thread, the seams of two-ply overlapping tubes are protruded, and it is difficult to completely adhere to the pipe. When the tapes are attached, there is a problem that they fall off when used for a long time due to the heterogeneity between materials.

In addition, the thermosetting resin should be impregnated into the circular nonwoven tube manufactured as described above. As a resin for impregnation, a curing agent is added to a main resin such as epoxy or polyester.

However, when the curing agent is added to the main resin, the non-woven fabric impregnated with the thermosetting resin at the factory hardens due to the curing reaction proceeds at room temperature, and moves to the work site by using a refrigerating vehicle to delay the curing reaction, or at the site. The method of mixing and using a curing agent is used immediately.

However, when using a refrigeration vehicle, a lot of vehicle purchase and maintenance costs are required, and when the production is performed on-site, there is a problem of moving the resin mixture and impregnation facility to the site.

The present invention is to provide a circular nonwoven tube impregnated with a thermosetting resin for repairing old water and sewage pipes, and is an integral circular nonwoven tube applying a needle punching method so that there is no protrusion even by overlapping, and the circular nonwoven tube is impregnated with The one-component high-temperature hardening resin that can be stored for a long time at room temperature and high temperature as a resin does not require the purchase or maintenance of a refrigeration vehicle separately, and the pot life can be extended without the need to carry resin mixing or impregnation facilities to the site. It is an object of the present invention to provide a nonwoven tube for reinforcing old and sewer pipes that can exhibit flexural strength.

1 is a perspective view of a nonwoven tube for reinforcing old and sewage pipes of one embodiment according to the present invention,

FIG. 2 is a cutaway perspective view of the nonwoven tube for reinforcing old and sewage pipes of FIG. 1. FIG.

3 is a perspective view of a nonwoven tube for reinforcing old water and sewage pipe of another embodiment according to the present invention.

FIG. 4 is a cutaway perspective view of the aged upper and sewage pipe reinforcing nonwoven tube of FIG. 3. FIG.

5 is a perspective view of a nonwoven tube for reinforcing old water and sewage pipe of another embodiment according to the present invention.

FIG. 6 is a cutaway perspective view of the nonwoven tube for reinforcing old and sewage pipes of FIG. 5; FIG.

7 is a perspective view of a conventional nonwoven tube for reinforcing old and sewage pipes.

<Description of the symbols for the main parts of the drawings>

10, 30, 50: round nonwoven tube

11, 31, 51: 1st flat nonwoven fabric 12, 32, 52: 2nd flat nonwoven fabric

33, 53: 3rd flat nonwoven fabric 34, 54: 4th flat nonwoven fabric

In one embodiment of the present invention, two flat nonwoven fabrics are alternately overlapped, and each end of the nonwoven fabric that is elongated at one end is circular in a state in which it is joined with each end of the nonwoven fabric which is inwardly inclined from the opposite end thereof. The part to be joined is stitched by needle punching, and the nonwoven fabric for reinforcing old and sewage pipes is formed by impregnating bisphenol epoxy resin with thermosetting resin in which bisphenol epoxy resin is mixed with room temperature curing agent and high temperature curing agent. It is characterized in that the tube.

As another embodiment of the present invention, in order to widen the diameter of the circular tube can be formed by further connecting and bonding a flat plate nonwoven fabric having the same structure to the two flat plate nonwoven fabric that both ends are alternately overlapping each other to form a circular pipe.

In still another embodiment of the present invention, in order to widen the diameter of the circular tube, two non-woven fabrics having the same structure are additionally connected to the nonwoven fabrics having different widths in which both ends alternately overlap each other in opposite directions. A circular tube can also be formed by joining.

Based on the accompanying drawings of the present invention will be described in more detail.

The present invention uses a needle punching method as a method for manufacturing a nonwoven fabric having a flat plate structure as a circular nonwoven tube, first forming a nonwoven fabric having a flat plate shape in a circular shape, and then joining both ends thereof. The needle punching method is to reciprocate the needle plate on the web lined up and down to connect the random fibers arranged in two dimensions by the barb attached to the needle in three dimensions. According to the present invention as a method for producing a dense nonwoven fabric without the incidental problems accompanying the material, the material used for the fabrication of the nonwoven fabric of the plate structure is in a circular shape regardless of the material and manufacturing method, for example, heat melting, needle punching or bonding method can do.

In the accompanying drawings, Figure 1 is a perspective view of a small diameter aging top and sewer pipe nonwoven tube according to the present invention, Figure 2 is a partially developed perspective view of the nonwoven tube of FIG.

According to Figures 1 and 2, a small diameter circular nonwoven tube overlaps the first flat nonwoven fabric 11 and the second flat nonwoven fabric 12 of the same width up and down with each other and then stitches the overlapped portions by needle punching to form an integrated flat plate. The nonwoven fabric of the structure is made by rolling both ends round each other in a circular overlap and stitching the overlapping portion again with needle punching, the nonwoven tube 10 of the circular tube is made.

As shown in FIG. 1, the circular nonwoven tube 10 has a first flat nonwoven fabric which is circular in a state where the first flat nonwoven fabric 11 and the second flat nonwoven fabric 12 overlap each other, but are extended at one end thereof. 11) the tip of the second flat plate nonwoven fabric 12, which extends in one end from the opposite end, is joined to the tip that is also inward from the opposite end. Both ends of the flat nonwoven fabric 11 and the second flat nonwoven fabric 12 are overlapped in one layer in a staggered state.

3 is a perspective view of a large diameter old upper and sewage pipe reinforcing nonwoven tube of another embodiment according to the present invention, Figure 4 is a partially developed perspective view of the reinforcing nonwoven tube of FIG.

That is, according to FIGS. 3 and 4, as the large-diameter circular nonwoven tube 30, the third flat nonwoven fabric 33 having the same structure as the first flat nonwoven fabric 31 and the second flat nonwoven fabric 32 shown in FIG. The fourth flat nonwoven fabric 34 is further joined and joined.

5 is a perspective view of a large diameter old upper and sewer pipe reinforcing nonwoven tube of another embodiment according to the present invention, Figure 6 is a partially exploded perspective view of the reinforcing nonwoven tube of FIG.

That is, according to Figs. 5 and 6, as the large diameter circular nonwoven tube 50, the width of the first flat plate nonwoven fabric 51 and the second flat plate nonwoven fabric 52 is different, and the first flat plate having a wide width on the outer surface thereof. The nonwoven fabric 51 is disposed, and the second flat plate nonwoven fabric 52 having a narrow width is disposed on the inner surface to be bonded to each other, while the flat nonwoven fabric further connected to the nonwoven fabric 51 has a wide third flat plate nonwoven fabric 53. ) And the narrow fourth flat plate nonwoven fabric 54 are further joined and joined in opposite directions.

By repeating the above process, by continuously connecting the nonwoven fabric of the plate structure by needle punching, it is possible to manufacture a circular nonwoven tube for reinforcing the old and sewage pipe of a large diameter, according to Figures 3 and 5 to join only two nonwoven fabric of the plate structure. Although illustrated as being, it is natural that a person skilled in the art can join two or more of them in connection with a larger diameter as needed.

The thermosetting resin is impregnated into the circular nonwoven tube manufactured as described above. The thermosetting resin used in the nonwoven fabric for reinforcing old and sewage pipes according to the present invention can be stored for a long time even when the main material and the curing agent are mixed, and cured only at high temperatures. That is, the reaction proceeds, that is, a one-component high temperature cured resin.

That is, according to the present invention, since the water in the upper and the sewer pipes that require repair and reinforcement have a lot of moisture, the unsaturated polyester resin reacts with water, and thus the strength is decreased. Therefore, a bisphenol-type epoxy resin is used. An amine-based room temperature (20 ° C) curing agent and a high temperature curing agent that undergoes a curing reaction at 120 ° C or more are mixed and used. It is preferable to mix and use these compounding ratios with respect to 100 weight part of epoxy resins at 40-60 weight part of normal temperature hardening agents, and 40-60 weight part of high temperature hardening agents.

When the one-component high-temperature cured resin is impregnated into the nonwoven tube at the above ratio, curing is not performed for about 7 to 10 days and the gelation state is maintained, and the nonwoven fabric tube is inserted into the old upper and sewer pipes. After maintaining the tube holding temperature at about 120 ℃ for about 2 hours by the hot air fan exhibits a flexural strength of 800kg / cm ² or more.

Referring to the present invention in more detail based on the embodiment as follows.

Example 1

A small diameter circular nonwoven fabric was produced by needle punching the overlapping and overlapping portions of a 3 mm thick nonwoven fabric made of polyester and a 5 mm thick flat nonwoven fabric. Cut the joints between the nonwoven fabrics to suit the bending strength measurement and use aromatic amine-based room temperature curing agent (brand name: TH-432,) as a curing agent based on 100 parts by weight of a bisphenol-type epoxy resin (trade name: YD-114, Kukdo Chemical, Korea). Kukdo Chemical Products, Korea) 60 parts by weight and impregnated with a high-temperature curing agent (brand name: KH-100, Kukdo Chemical, Korea) that the curing reaction proceeds at 120 ℃ or more.

As described above, the circular nonwoven tube impregnated with the one-component high-temperature curing resin was inserted into the old upper and lower sewer pipes, and the pipe holding temperature was maintained at about 120 ° C. for about 2 hours using a hot air blower.

The result of the curing state of the resin according to the temperature change of the circular nonwoven tube is shown in Table 1 below, and the bending strength measurement results after the reaction for 2 hours at 120 ° C. according to the elapsed time of the one-component curing agent are shown in Table 2 below.

Example 2

It carried out similarly to the said Example 1 except having mix | blended 40 weight part of room temperature hardening | curing agents and 60 weight part of high temperature hardening | curing agents in the said Example 1. The results are shown in Table 1 and Table 2 below.

Comparative Example 1

In Example 1, except that only 100 parts by weight of room temperature curing agent as a curing agent was used in the same manner as in Example 1. The results are shown in Table 1 below.

Comparative Example 2

In Example 1, except that only 100 parts by weight of the high temperature curing agent as a curing agent was used in the same manner as in Example 1. The results are shown in Table 1 and Table 2 below.

When only the room temperature curing agent is used in Table 1, the curing reaction proceeds considerably even at room temperature, and thus it is understood that a refrigeration facility is necessary for delaying the curing reaction. However, it can be seen that when the high temperature curing agent is mixed with the room temperature curing agent, the curing time becomes very long not only at room temperature but also at temperatures of 40 ° C. and 50 ° C., and the longer the mixing ratio of the high temperature curing agent is, the longer the period becomes.

(Unit: kg / cm ² ) division Elapsed days 1 day 3 days 5 days 7 days 10 days Example 1 950-1200 900-1100 920-1200 Example 2 850-1000 900-1200 800-1000 820-1000 800 ~ 1200 Comparative Example 2 250-280 180-230 200-230 200-250 150-200

According to Table 2, in the case of Examples 1 and 2 showed a tensile strength of 800kg / cm ² or more, Comparative Example 2 in the reaction temperature of 120 ℃ and reaction time 2 hours of 150 to 300kg / cm ² Low intensity was shown due to low reaction temperature or short reaction time.

In conclusion, in the case of using only a room temperature curing agent as in Comparative Example 1, the curing reaction proceeds so fast that there is no time to work in the field. Since the time is required for more than 2 hours and the work time may be long, it was found that it is appropriate to use a mixture of a room temperature hardener and a high temperature hardener as in Examples 1 and 2 of the present invention.

The circular nonwoven tube for reinforcing old and sewage pipes manufactured by the method of the present invention is an integral circular pipe with no protruding portion on the seam, and can be completely adhered to the pipeline when reinforcing or inserting the old top and sewer pipes, Since it can be extended, there is no need to use a refrigerating vehicle or to manufacture it on site, and thus it is possible to lengthen the pot life, and does not need to move to the work site, and when heated to 120 ℃, the bending strength is 800 kg / There is an effect that can represent more than cm ² .

Claims (3)

Both ends of the two flat nonwoven fabrics 11 and 12 overlap each other in a staggered layer, and each end of the first flat nonwoven fabric 11 and the second flat nonwoven fabric 12, which extends long from one end, is inward from the opposite ends thereof. The first flat plate nonwoven fabric 11 and the second flat plate nonwoven fabric 12 are joined to each end of a circular state, but the overlapped or joined portions are stitched by needle punching to form a unitary structure in which seams do not protrude. A nonwoven tube for reinforcing old water and sewage pipes, characterized in that the circular nonwoven tube 10 is impregnated with a thermosetting resin in which a bisphenol epoxy resin is mixed with a room temperature curing agent and a high temperature curing agent. 3. The third and fourth flat nonwoven fabrics 33 according to claim 1, wherein the third and fourth flat nonwoven fabrics 33, having the same structure, are superimposed on the first and second flat nonwoven fabrics 31 and 32, which are alternately overlapped in order to widen the diameter of the circular tube. A nonwoven tube for reinforcing old water and sewage pipes, characterized in that it is further connected and joined. 3. The third and fourth flat nonwoven fabrics according to claim 1, wherein the first and second flat nonwoven fabrics 51 and 52 having different widths in which both ends are alternately overlapped with each other in order to widen the diameter of the circular tube. A nonwoven tube for reinforcing old and sewage pipes, characterized in that (53,54) is further connected and joined in opposite directions to each other.