JPH0369339A - Lining material and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the mechanical characteristic value such as tensile- compressive strength, an elastic modulus, of a felt layer by forming the felt layer of a lining material impregnated with an ultraviolet curing type unsaturated polyester resin containing an optical initiator absorbing near ultraviolet rays by unifying glass fiber with an acrylic resin having excellent light transmission properties through punching. CONSTITUTION:The outer-layer film tube 2 of a lining material 1 has excellent solvent resistance, and is formed of a synthetic resin film such as nylon based on white color. With a felt layer 3 laminated onto the inner surface of the outer-layer film tube 2, felt 3a is shaped by punching transparent acrylic fiber, glass fiber 3b is dispersed to both surfaces or one surface or intermediate section of the outer and inner surfaces of the felt 3a and unified through punching, and felt 3a is impregnated with an ultraviolet curing type unsaturated polyester resin containing an optical initiator absorbing near ultraviolet rays. An inner- layer film tube 4 is composed of a film tube 5 formed of a synthetic resin having superior light transmission properties and low steam transmission and a film tube 6 having excellent light transmission properties, low gas permeability and a high load heat-deformation temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lining material used for the inner lining of existing pipes such as sewerage, water supply, oil pipes, and other pipes, and a method for manufacturing the same.

[Prior Art] For the purpose of this, an inverted lining method in which the inner surface of an existing pipe is lined with synthetic resin or a synthetic resin pipe is formed on the inner surface of an existing pipe has been attracting attention.

For example, Japanese Patent Publication No. 55-43890, Japanese Patent Application Publication No. 64-
The construction method disclosed in Publication No. 857311 involves inverting a lining material in which a needle felt layer is impregnated with a liquid thermosetting resin such as epoxy or polyester within an existing pipe using fluid pressure.
In this method, a synthetic resin pipe is formed on the inner surface of the existing pipe by advancing the lining material, pressing the inverted lining material against the inner surface of the existing pipe using fluid pressure, and curing the thermosetting resin.

Conventional lining materials impregnated with thermosetting resin, as typified by Japanese Patent Publication No. 55-43890, are turned over and cured by heating to form a synthetic resin pipe, but the total time of heating time and cooling time during heating curing is For example, the diameter is 300tn and the thickness is 6
It takes about 15 hours when polyester resin is used as the thermosetting resin for the lining material of m11. Also, even if you use a quick-drying type of epoxy resin, it will take about 6 to 8 hours.
The disadvantage was that it took a long time to work. This is due to the fact that heat is accumulated in the existing pipes and the surrounding soil during the long heating retention period, which slows down the cooling rate6.

In order to eliminate these drawbacks, we have used a lining material made of a felt layer impregnated with a resin that hardens by irradiating the fibrous material with ultraviolet rays, and in a short time, synthetic resin can be applied to the inner surface of the existing pipe. For example, Japanese Patent Application Laid-Open No. 60-242 (1311),
This is disclosed in Japanese Patent Application Laid-open No. 17343 or Japanese Patent Application Laid-open No. 132631/1983.

[Problems to be Solved by the Invention] The conventional lining material disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 60-242038 etc. is formed only of a felt layer impregnated with a resin that hardens upon irradiation with ultraviolet rays. The tensile/compressive strength and modulus of elasticity of the material are low, and the lining material deforms when it is inverted, resulting in a difference in the amount of resin impregnated in the cross-sectional direction of the lining material, resulting in variations in strength as well as thickness. was there.

In addition, especially when using a long lining material, it is necessary to roll up or fold the flexible lining material impregnated with the cured resin after the impregnation process in order to store it. At this time, variations in thickness occur in each part of the lining material due to its own weight or differences in pressing force, and when a synthetic resin pipe is formed from the lining material in such a state, variations in thickness and strength also occur.

In addition, the joints of branch pipes to existing pipes are misaligned or disconnected.

If there are voids such as cracks, the hardened resin around these voids will seep into the void due to the pressing force of the existing pipe after being turned over, reducing the strength around the void, and the hardened resin may also flow out together with underground water. This also has the disadvantage that it becomes a porous impregnated layer, resulting in a significant decrease in strength.

Also, if groundwater infiltrates into the felt layer of the lining material,
Another drawback is that the ultraviolet rays are absorbed by oxygen in groundwater, reducing the radical reaction of the cured resin and reducing the efficiency of the ultraviolet curing action.

This invention was made to solve these shortcomings, and the purpose is to propose a lining material that improves physical properties such as tensile/compressive strength and elastic modulus, and is not affected by groundwater, etc., and a method for manufacturing the same. What should I do?

[Means for Solving the Problems] The lining material according to the present invention includes an outer film tube, a felt layer provided on the inner surface of the outer film tube,
It is formed from an inner layer film tube provided on the inner surface of the felt layer.

The outer film tube is made of a white-colored synthetic resin that is resistant to solvents. The felt layer is made of acrylic fibers, with glass fibers dispersed on both the inner and outer surfaces, one side, or the middle, punched and integrated, and impregnated with an ultraviolet curable unsaturated polyester resin containing a photoinitiator that absorbs near ultraviolet rays. It is formed by The interior film tube is made of a synthetic resin that has good light transmittance, low water vapor and gas permeability, and high thermal deformation temperature under load.

In addition, the manufacturing method of this lining material includes an outer layer film sheet made of a white-based synthetic resin having K1 solvent properties, and an outer layer film sheet that is adhered to one side of the outer layer film sheet and made of acrylic fibers on both the upper and lower surfaces or on one side. Or a felt layer formed by punching and integrating glass #a fibers dispersed in the intermediate layer and impregnated with an ultraviolet curable unsaturated polyester resin containing a photoinitiator that absorbs near ultraviolet rays, and the other of the felt layers. A multilayer sheet consisting of an inner layer film sheet made of a synthetic resin that has good light transparency, low water vapor and gas permeability, and high heat deformation temperature under load is attached to the inner diameter of the existing pipe.
The cut multilayer sheet is cut to a width equal to 0 to 98% of the circumference plus a certain amount of overlap, and the cut multilayer sheet is sewn with the inner layer film sheet inside and both ends in the width direction overlapped, and the overlapped part and the multilayer sheet are sewn. Each cross section is laminated with a film sheet made of the same material as the outer film sheet.

[Function] The lining material of this invention is formed by integrating the felt layer with acrylic resin and glass fiber by punching, so that
Increases mechanical properties such as tensile/compressive strength, modulus of elasticity, etc. of the felt layer.

In addition, by providing an outer film tube made of solvent-resistant synthetic resin on the outer surface of the felt layer on the existing pipe side, groundwater can be prevented from entering the felt layer when the lining material is pressed against the inner surface of the existing pipe. , and prevents the resin of the felt layer from seeping out. By forming this outer layer film tube in a white color, the reflection efficiency of ultraviolet rays that are irradiated from the inside and hardens the felt layer is increased.

Further, by providing a light-transmitting inner film tube on the inner surface of the felt layer, the felt layer can be irradiated with ultraviolet rays without being absorbed. Furthermore, since this inner layer film tube is made of synthetic resin with low water vapor and gas permeability and high heat deformation temperature under load, it can withstand fluid pressure when the lining material is expanded from the inside by fluid pressure such as water pressure. It also prevents fluids such as water vapor from entering the felt layer.

Moreover, this lining material can be formed according to the inner diameter of the existing pipe by simply processing a multilayer sheet consisting of an outer film sheet, a felt layer, and an inner film sheet.

[Example] In Figure 1, which is a perspective view showing an example of the present invention, l is a lining material, 2 is an outer film tube of the lining material l, and the outer film tube 2 has solvent resistance. It is made of a synthetic resin film such as nylon or vinylon with a white tone. 3 is a felt layer laminated on the inner surface of the outer film tube 2. The felt layer 3 is a layer that determines the thickness of the synthetic resin tube after molding, and is made of transparent acrylic fibers as shown in the cross-sectional view of FIG. For example, with thickness t = 6 mm, 500 g N1800 g /
m'' to form a felt 3a, and a glass fiber 3b having a length of, for example, 30n+m or more is formed on both sides, one side, or the middle of the inner and outer surfaces of the felt 3a.
are dispersed in an amount of 20% by weight or more and integrated by punching, and the felt 3a is impregnated with an ultraviolet curable unsaturated polyester resin containing a photoinitiator that absorbs the long wavelength spectrum of 350 to 450 nm, which has a large penetration depth of near ultraviolet rays. It is. The ultraviolet curable unsaturated polyester resin impregnated into the felt 3a is made of, for example, neopentyl glycol acrylate resin or epoxy acrylate resin.
The photoinitiator is composed of, for example, acylphosphine oxide and a solvent, or acylphosphine oxide and a peroxide catalyst and a solvent that assist heat curing with heat generated by light in the thickness direction. In terms of thickness retention, it is preferable to have a viscosity of 1 to 40 poise at a temperature of 20°C.

4 is, for example, 20 laminated on the inner surface of the felt layer 3.
It is an inner layer film tube having a thickness of 0 μm or more, and the inner layer film tube 4 is a film tube 5 formed of a synthetic resin with good light transmittance and low water vapor permeability,
The film tube 6 is made of, for example, a nylon film, which has good light transmittance, low gas permeability to carbon dioxide gas, etc., and high thermal deformation temperature under load. The film tube 5 of this inner layer film tube 4 is combined with the inner film tube 6 by a coextrusion method, and also acts as an adhesive layer that is easy to laminate with the felt layer 3.
For example, ionomer resins having good transparency, elongation and adhesive properties are used.

Next, a method for manufacturing the lining material I configured as described above will be explained.

First, as shown in the perspective view of FIG. 3, the outer film sheet 2a forming the outer film tube 2 and the felt layer 3
A multilayer sheet 7 consisting of an inner layer film sheet 4a consisting of film sheets 5a and 6a forming a film tube 5.6 is overlapped with a width W of 90 to 98% of the inner diameter of the existing pipe lining the inner surface, and a width of 50+in+ is added. Cut it to the desired width.

Next, as shown in FIG. 4, the cut multilayer sheet 7 is sewn with the inner layer film sheet 4 inside, with both ends in the width direction overlapped by the overlapped portion. The sewn portion and the cross section of the multilayer sheet 7 are laminated with a partially laminated sheet 8 made of the same synthetic resin as the outer film sheet 2a, and the felt layer 3 is sealed to form the lining material 1 shown in FIG.

The lining material 1 formed in this way is inserted into the existing pipe as it is, without using the inversion lining method, and becomes a synthetic resin pipe. On the other hand, lining material 1 used in the inverted lining method
For a, it is necessary to invert the inner and outer surfaces of the lining material l, so
One end of the lining material l formed as described above is sealed and the inner film sheet 4 is turned over using a pressure medium such as air to obtain the lining material 1a shown in FIG. 5. be able to.

Lining material formed in this way 1. Since la cures when exposed to light, it is stored and transported in a sealed container made of an opaque material in a circularly rolled or folded state.

Next, either insert the lining material 1 configured as described above into the existing pipe as it is, or insert the lining material 1a for inverted lining into the existing pipe.
Invert and advance the pipe into the existing pipe using fluid pressure and insert it. Fluid pressure such as water pressure is applied from inside the lining material 1 inserted into the existing pipe or the inverted lining material 1a to expand the lining material 1.1a and press it against the inner surface of the existing pipe. When this fluid pressure is applied to press the lining material l onto the inner surface of the existing pipe, the film tube 6 of the inner layer film tube 4 is formed of a strong nylon film or the like, and the outer layer film tube 5 is also present in the outer layer. Therefore, the felt layer 3 can be pressure-bonded to the inner surface of the existing pipe with a uniform thickness.

Moreover, since the inner and outer film tubes 4 and 2 are covered with inner and outer surfaces of the felt layer 3, which do not allow steam, water, etc. to pass through, when crimping the inner surface of the existing pipe, underground water or water to apply fluid pressure can be removed. This prevents steam and the like from entering the felt layer 3, and also prevents the resin of the felt layer 3 from seeping out. Furthermore, even if the synthetic resin pipe is used for a long period of time after being formed in an existing pipe, the contents under pressure will not permeate the inner film tube 4 and diffuse into the felt layer 3, thereby causing the felt layer 3 to deteriorate.

While the lining material 1 is being crimped onto the inner surface of the existing pipe in this manner, an ultraviolet generating lamp such as a metal halide lamp is inserted along the inner film tube 4 of the lining material 1 to irradiate the lining material 1 with ultraviolet light. When the irradiated ultraviolet rays pass through the inner film tube 4 having good optical transparency, they are hardly absorbed and enter the felt layer 3. Furthermore, the ultraviolet rays that have entered the felt layer 3 and reached the outer film tube 2 are reflected by the outer film tube 2 having a white base color and return to the felt layer 3. The photoinitiator impregnated in the felt layer 3 absorbs this ultraviolet rays and causes a radical polymerization reaction to generate heat. This heat further activates the peroxide catalyst molecules, thereby converting the ultraviolet curable unsaturated polyester resin. The felt layer 3 is cured in a short period of about 3 minutes by accelerating curing, and a synthetic resin pipe is formed within the existing pipe. When curing this felt layer 3, the felt layer 3
Since no groundwater or the like has penetrated into the surface of the steel, ultraviolet rays are not absorbed by the oxygen in the groundwater, thereby preventing the deterioration of the ultraviolet curing effect caused by oxygen.

[Effects of the Invention] As explained above, the present invention has a felt layer of a lining material impregnated with an ultraviolet curable unsaturated polyester resin containing a photoinitiator that absorbs near ultraviolet rays, and a glass layer made of acrylic resin with good light transparency. By integrally forming the #a male by punching, the mechanical properties such as tensile/compressive strength and elastic modulus of the felt layer can be increased.

Further, since the felt layer is sandwiched between the inner film tube and the outer film tube, the felt layer can be maintained at a uniform thickness when the lining material is crimped onto the inner surface of the existing pipe.

In addition, by providing an outer film tube made of solvent-resistant synthetic resin on the outer surface of the felt layer on the existing pipe side, groundwater can be prevented from entering the felt layer when the lining material is pressed against the inner surface of the existing pipe. Since the resin in the felt layer is prevented from seeping out, the ultraviolet curable resin can be evenly distributed in the felt layer with a uniform thickness, making it possible to form a synthetic resin pipe with a constant thickness. .

In addition, by providing a light-transmitting inner film tube on the inner surface of the felt layer, the felt layer is irradiated with ultraviolet rays without being absorbed by the inner film tube, and by making the outer film tube white-based, ultraviolet rays are reflected. Since the efficiency is increased, the felt layer can be effectively irradiated with ultraviolet rays.

Furthermore, the outer film tube and inner film tube prevent underground water, pressurization, etc. from entering the felt layer, which prevents oxygen, which is harmful to ultraviolet curing, from entering the felt layer. The curing action can be carried out quickly and more reliably, so that the felt layer can be cured in a short time, and the working time can be significantly shortened.

In addition, since the inner layer film tube is made of a synthetic resin that has a high thermal deformation temperature under load, it can withstand fluid pressure sufficiently when the lining material is expanded from the inside by fluid pressure, and can prevent deformation when exposed to ultraviolet rays. can.

Furthermore, by processing a multilayer sheet consisting of an outer film sheet, a felt layer, and an inner film sheet, it is possible to form a lining material that matches the inner diameter of the existing pipe, making it easy to select a lining material that is suitable for the existing pipe. can be manufactured.

In addition, the inner layer film sheet is co-extruded with films that have low gas permeability and low water vapor permeability, so the permeability of both gas and water vapor is low, and even after long-term use, the contents do not remain in the inner layer. It does not permeate the film sheet and diffuse into the felt layer, and can prevent deterioration of the felt layer and decrease in i-performance.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a lining material according to an embodiment of the present invention, FIG. 2 is a sectional view showing a felt layer of the above embodiment, and FIG.
The figure is a perspective view showing the multilayer sheet of the above embodiment, FIG. 4 is a sectional view showing the manufacturing method of the above embodiment, and FIG. 5 is a perspective view showing the lining material used in the inversion lining method. 1. la... Lining material, 2... Outer layer film tube, 3... Felt layer, 4... Inner layer film tube, 5.6... Film tube, 7...
...Multilayer sheet. l: Inner layer 2: Outer pJ film chew 71 Figure 1 3: Felt layer Figure 5

Claims (1)

[Claims] 1. An outer layer film tube made of a white-based synthetic resin having solvent resistance, and an outer layer film tube that is bonded to the inner surface of the outer layer film tube and made of acrylic fiber on both or one side of the inner and outer surfaces or as an intermediate layer. A felt layer is made by punching and integrating dispersed glass fibers and is impregnated with an ultraviolet curable unsaturated polyester resin containing a photoinitiator that absorbs near ultraviolet rays, and a felt layer that is adhered to the inner surface of the felt layer and has optical transparency. A lining material characterized by comprising an interior film tube made of a synthetic resin with low water vapor and gas permeability and high heat deformation temperature under load. 2. An outer film sheet made of a synthetic resin with solvent resistance and a white tone, and glass that is adhered to one side of the outer film sheet and made of acrylic fibers and dispersed on both or one side of the upper and lower surfaces or in the middle layer. A felt layer is formed by punching and integrating fibers and is impregnated with an ultraviolet curable unsaturated polyester resin containing a photoinitiator that absorbs near ultraviolet light. A multilayer sheet consisting of an inner layer film sheet made of a synthetic resin with low gas permeability and high heat deformation temperature under load is cut to a width that is 90 to 98% of the existing pipe inner diameter plus a certain amount of overlap. The multilayer sheet is sewn with the inner film sheet inside and both ends in the width direction overlapped.
A method for producing a lining material, comprising laminating the overlapping portion and each cross-sectional portion of the multilayer sheet with a film sheet made of the same material as the outer layer film sheet.