JPH02265708A - Manufacture of inner surface lining hume pipe - Google Patents

Abstract

PURPOSE:To make a lining layer be not separated even when the side surface of a hume pipe is bored by means of a boring drill by applying a specific (metha) acrylate primer in advance of forming an anticorrosive lining layer. CONSTITUTION:In advance of forming an anticorrosive lining layer, primer is applied to the inner surface of a hume pipe, which is being compounded with a radical polymerization initiator to radical polymerization monomer containing at least 30wt.% monofunctional and/or multifunctional (metha) acrylate of 1000 or less in molecular weight. Radical polymerization type thermosetting resin is of resin capable of being thermoset through a radical polymerization of for example polyester resin, vinylester resin, acryl resin, urethane (metha) acrylate resin or the like. For adjusting the thermosetting property of the primer, it is desired that the radical polymerization initiator is blended at rates in the range of 0.1-5 pts.wt., preferably of 0.5-3 pts.wt. relative to 100 pts.wt. of radical polymerization monomer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing an internally lined hume pipe in which an anti-corrosion lining layer is formed on the inner peripheral surface of the fume pipe.

(Prior Art) Huium pipes are currently used in Odori as water/sewage pipes, drainage pipes, agricultural water pipes, etc.

However, since the material of the hume pipe is hymento concrete, it has the disadvantage that it is susceptible to corrosion when it comes into contact with inorganic acids, organic acids, inorganic salts, oils and fats, etc.

Therefore, in order to improve the acid resistance and 1lfl salt resistance of this hume tube, a layer of radical polymerizable thermosetting resin such as unsaturated polyester resin, vinyl ester resin, urethane (meth)acrylate resin, etc. is applied to the inner surface of the hume tube. Attempts have been made to provide it as an anti-corrosion lining.

(Problems to be Solved by the Invention) In a lining fume pipe provided with such an anti-corrosion lining layer, the adhesion between the cement concrete layer and the radical polymerizable thermosetting resin lining layer is poor, and the lining fume pipe is Due to the internal stress caused by the difference in thermal contraction between the cement concrete layer and the resin lining layer and the hardening shrinkage of the resin lining layer, which occurs during cooling after heating and curing, the bond between the cement concrete layer and anticorrosive lining layer of the humid pipe is There was a drawback that delamination was likely to occur between the layers.

In order to prevent delamination in the lining pipe, there are methods to improve the adhesion between the cement concrete layer and the lining layer by using urethane resin or epoxy resin with excellent adhesive strength as a brimer, and methods to improve the adhesion between the cement concrete layer and the lining layer. A method of relieving internal stress by lining with a composition containing a thermosetting resin with a small amount and a filler.
No. 0713) has been proposed.

However, such methods are insufficient to prevent delamination of lined fume pipes used under harsh conditions. When performing
There was a problem in that the anti-corrosion lining layer peeled off due to the vibration.

The present invention solves these problems. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an internally lined hume pipe with excellent acid resistance and salt resistance, which prevents the lining layer from peeling off even when holes are made on the side surface of the hume pipe with a drilling drill.

(Means and effects for solving the problem) As a result of repeated research in view of the above circumstances, the present inventors have determined that a specific (meta)
The inventors have discovered that the above object can be achieved by applying an acrylate-based brimer prior to forming the anticorrosive lining layer, and have completed the present invention.

That is, in the present invention, when manufacturing a lined hume pipe by forming an anticorrosion lining layer made of a radically polymerizable thermosetting resin on the inner surface of a hume pipe, prior to forming the anticorrosion lining layer, At least 30% by weight of monofunctional and/or polyfunctional (meth)acrylates
Radical polymerization σ to the radically polymerizable monomer containing
The present invention relates to a method for manufacturing an inner-lining hume tube, characterized in that a brimer (I) containing an initiator (I) is applied on the inner surface of the tube in advance.

In the present invention, it is possible to apply brimer CI, which is composed of a radically polymerizable monomer containing a specific (meth)acrylate and a radical polymerization initiator, to the inner surface of the hume pipe in advance before forming the anticorrosive lining layer. is important.

This brimer (1) exhibits a remarkable effect as a brimer for lining hume pipes based on the anaerobic hardening properties peculiar to the (meth)acrylate contained therein. In other words, a part of the pre-applied brimer (I>) penetrates into the porous hume tube and hardens, thereby firmly bonding with the cement concrete layer and reinforcing the hume tube. A part of I> remains on the surface of the humid pipe and remains uncured regardless of the time after the coating of the brimer, and immediately hardens together with the anti-corrosion lining layer after the thermosetting resin that becomes the anti-corrosion lining layer is laminated. In this way, Brimer (I) can provide strong adhesion between the cement concrete layer of the hump pipe and the anticorrosive lining layer made of a radically polymerizable thermosetting resin.

In the present invention, the radical polymerizable thermosetting resin for forming the anti-corrosion lining layer includes, for example, polyester resin, vinyl ester resin, allyl resin, urethane (meth)acrylate resin, which has been conventionally used for lining humid pipes. A resin that can be thermoset by radical polymerization is used as the anticorrosive lining layer.In addition, the anti-corrosion lining layer includes not only a resin lining layer made of the above-mentioned resin, but also a flake lining layer made of resin mixed with glass flakes, and a resin lining layer made of glass flakes mixed with resin. A resin mortar lining layer made of a resin mixed with reinforcing fibers, an FRP lining layer made of a resin mixed with reinforcing fibers, etc. may be employed.

In the present invention, the molecule f! contained in the radically polymerizable monomer constituting Brimer (I)! 1ooo or less monofunctional (meth)acrylate and/or polyfunctional (meth)acrylate (hereinafter simply referred to as (meth)acrylates)
As long as it has one or more (meth)acryloyl groups in the molecule and has a molecular weight of 1000 or less, there are no particular restrictions, such as methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl ( Meta)
Acrylate, isobutyl (meth)acrylate, n-
Butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, hydroxyethyl (meth)acrylate, methoxyethyl (meth)acrylate, paramethylphenoxyethyl (meth)acrylate, dicyclopentagenyl (meth)acrylate, dicyclopentenyl Monofunctional (meth)acrylates such as oxyethyl (meth)acrylate, (meth)acrylicoxyethyl phosphate, 2-hydro-3-furyloxypropyl (meth)acrylate, and ethylene glycol di(meth)acrylate , brobylene glycol di(meth)acrylate, neobentyl glycol di(meth)acrylate, glycerin tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, bisphenol A di(meth)acrylate ) acrylate, butanediol di(meth)
Acrylate, hexanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate,
Polyfunctional (meth)acrylates such as polypropylene glycol di(meth)acrylate can be mentioned.

Brimer (I) in the present invention may include the above-mentioned monofunctional (meth)acrylates and polyfunctional (meth)acrylates alone or as a mixture of two or more, or radical polymerization of other than the above-mentioned (meth)acrylates. monomers such as styrene, halogenated styrene,
It can be blended as a mixture with α-methylstyrene, vinyltoluene, divinylbenzene, vinyl acetate, diallyl phthalate, etc.

The radically polymerizable monomer constituting the brimer (I) in the present invention needs to contain at least 30% by weight of the above-mentioned (meth)acrylates. If the content of <meth)acrylates is small, less than 30% by weight, a sufficient effect in improving the adhesion between the cement concrete layer and the anti-corrosion lining layer of the humid pipe will not be exhibited.

In addition, the molecular weight of the (meth)acrylates used in blending with Brimer (I) is 1000 or less, preferably 500
It is as follows. If the molecular weight exceeds 1000, the penetration of the (meth)acrylates into the interior of the hume tube will be insufficient, and sufficient adhesion between the cement concrete layer of the hume tube and the anti-corrosion lining layer will not be obtained.

As the radical polymerization initiator constituting Brimer (I), conventionally known compounds that generate radicals and cause radical polymerization at temperatures above the decomposition temperature are used, such as benzoyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, Examples include organic peroxides such as cyclohexanone peroxide and lauroyl peroxide, and azo compounds such as azobisisobutyronitrile. If necessary, organic metal salts such as cobalt naphthenate and cobalt octoate, fatty acids, etc. It is used in combination with polymerization accelerators such as group amines, aromatic amines, and mercaptans.

Brimer (I) used in the present invention is made by blending a radical polymerization initiator with the radically polymerizable monomer containing the above-mentioned specific (meth)acrylates, but the amount of the radical polymerization initiator blended is The amount can be increased or decreased as appropriate depending on the curability required for the Brimer (I).

However, in order to adjust the curing properties of the brimer (1) so as to achieve a well-balanced reinforcement of the cement concrete layer of the humid pipe and improvement of the adhesion of the anti-corrosion lining layer, the radical polymerization initiator is a radical compensating monomer. 1
0.1 to 5 parts by weight, preferably 0.00 parts by weight.
It is preferable to mix it in a proportion in the range of 5 to 3@at parts.

In addition, Brimer (I) contains diluents such as organic solvents to improve coating workability and silane to further improve adhesiveness, as long as it does not impair permeability into the interior of the humid tube or anaerobic curing properties. Additives for improving adhesion such as coupling agents may be added as necessary.

In order to manufacture an internally lined fume pipe by carrying out the present invention, in a conventionally known method for manufacturing a lined fume pipe, a brimer (
It is sufficient to apply 1) to the inner surface of the hume pipe in advance with a brush, roll coater, etc., or by spraying. For example, the above-mentioned radical polymerization type thermosetting material can be applied to the inner surface of the hume pipe coated with Brimer I>. A composition prepared by blending a radical polymerization initiator into an uncured liquid resin is coated and laminated, and then the composition is cured to form an anticorrosive lining layer made of a radical polymerizable thermosetting resin on the inner surface of the hume tube. .

(Example) Hereinafter, the present invention will be explained in detail based on Examples.

Example 1 After primary curing, 100 parts of 2-hydroxyethyl methacrylate (molecular 1130) as a radically polymerizable monomer and a radical polymerization initiator were rotated at 25 Orpm with its axis horizontally. A brimer obtained by blending 1.011 parts of benzoyl peroxide and 0.5 parts of dimethylaniline was uniformly applied to the inner peripheral surface of the humid tube at a ratio of 200a/ynj.

Next, an unsaturated polyester resin (Evolac G-103>10 manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd., 1 part by weight, 100 parts by weight of silica powder, 100 parts by weight of silica sand No. 7, 1 part by weight of benzoyl peroxide and 0 parts by weight of dimethylaniline) was added. .5
The unsaturated polyester resin mortar lining material obtained by mixing the multi-layered parts is poured into the inner surface of the rotating tube to form a 2 sll anti-corrosion lining layer with a uniform thickness.
It was cured and cured at 80° C. for 1 hour to obtain an internally lined hume pipe (1).

A hole with a diameter of 50 mm was drilled from the side surface of the internally lined hume pipe using a perforation drill, and the adhesion between the cement concrete layer and the anticorrosion lining layer of the hume pipe was determined depending on the peeling state of the anticorrosion lining layer at the drilled part. We conducted an evaluation.

The results were as shown in Table 1.

Examples 2 to 10 In place of 100 parts by weight of 2-hydroxyethyl methacrylate of the radically polymerizable monomer in Example 1,
Internally lined hume pipes (2) to (10) were obtained in the same manner as in Example 1 except that the radically polymerizable monomers having the composition shown in the table were used.

The adhesiveness of each of the obtained internally lined humid pipes (2) to (10) was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Examples 1 to 4 Radical polymerizable monomer in Example 1 /')2-
Hydroxyethyl methacrylate 100! Comparative inner lining hume pipes (1) to (4) were obtained using Example 1 and Jii +1 except that the radically polymerizable monomer having the composition shown in Table 1 was used instead of 11 parts of I.°. Ta.

Obtained comparative inner lining hume tubes (1) to (4)
The adhesiveness of each of these was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 5 A urethane resin primer (K manufactured by Kanebo NSC Co., Ltd.) was used instead of the primer consisting of a radically polymerizable monomer and a radical polymerization initiator in Example 1.
A comparative inner lining hume tube (5) was obtained in the same manner as in Example 1 except that the same amount of BK-YP) was used.

When the adhesion of the obtained comparative internally lined humid pipe (5) was evaluated in the same manner as in Example 1, peeling of the anticorrosive lining layer around the perforation was observed.

Comparative Example 6 An epoxy resin primer (Hybon 20 manufactured by Nippon Paint Co., Ltd.) was used instead of the primer consisting of a radically polymerizable monomer and a radical polymerization initiator in Example 1.
Ace) to n! ! A comparison internally lined hume pipe (6) was obtained in the same manner as in Example 1 except that it was used in Example 1.

When the adhesion of the obtained comparative internally lined humid pipe (6) was evaluated in the same manner as in Example 1, peeling of the anticorrosive lining layer over a considerable area from the periphery of the perforation was observed.

Comparative Example 7 A low shrinkage type unsaturated polyester resin (
Evolac N-134 manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.)
A comparative internally lined hume pipe (1) was obtained in the same manner as in Example 1, except that the anticorrosive mortar lining material obtained using the same method was poured directly onto the inner surface of the hume pipe.

When the adhesion of the obtained comparative internally lined humid pipe (7) was evaluated in the same manner as in Example 1, peeling of the anti-corrosion lining layer over a considerable area from the periphery of the perforation was observed. Numerous "cuts" were observed on the main body of the Huyum tube.

(Effects of the Invention) According to the manufacturing method of the present invention, the perforability of the concrete layer and the anticorrosion lining layer of the humid pipe is dramatically improved compared to the conventional method, thereby eliminating the need for perforation during piping construction. Eliminates the problem of peeling off the anti-corrosion lining layer due to cut pipes.

■In addition to eliminating the problem of corrosion caused by sewage that comes into contact with piping, the problem of so-called "blistering" and "lifting" of the anti-corrosion lining layer due to the paper phenomenon caused by pressurized water is also eliminated.

In addition, a portion of the brimer penetrates into the interior of the hume tube and hardens, which improves the corrosion resistance of the tube itself and allows the anti-corrosion lining layer to be made thinner.

The strength of the tube itself is improved, and the thickness of the tube as a whole can be reduced.

Claims (1)

[Claims] 1. When producing a lined hume pipe by forming an anticorrosion lining layer made of a radically polymerizable thermosetting resin on the inner surface of the fume tube, prior to forming the anticorrosion lining layer,
A primer (I) made by blending a radical polymerization initiator with a radically polymerizable monomer containing at least 30% by weight of the following monofunctional and/or polyfunctional (meth)acrylates is applied to the inner surface of the fume tube in advance. A method for manufacturing an internally lined Hume tube, characterized by: 2. The method for producing an internally lined fume tube according to claim 1, wherein the amount of the radical polymerization initiator is in the range of 0.1 to 5 parts by weight per 100 parts by weight of the radically polymerizable monomer.