JP2738546B2 - Lining paint used to rectify existing water supply piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining paint to be applied after wiping the inner surface of a pipe, especially an existing water supply pipe, without removing the pipe, in order to revive or regenerate the existing water supply pipe.

[Prior art]

In general, various methods and devices for resuscitation or rehabilitation of existing water supply pipes of this type are well known.
For example, U.S. Patent No. 3,139,704, Japanese Patent Publication No. 58-1
No. 4826 and Japanese Patent Publication No. 57-56391. In these conventional techniques, a technique for resuscitation or rehabilitation without removing the existing pipe is disclosed, and after cleaning the inside of the pipe, paint is introduced into the pipe by different means to apply the coating. is there. And recently (around 1986) the thickness of the coating applied for resuscitation or rehabilitation should be 0.6 mm or more, the average of three places should be 0.7 mm or more, and the adhesion strength of the coating should be 30 kg / cm ² or more. In addition, it is set in each related water bureau and this kind of industry.

[Problems to be solved by the invention]

The coating technique disclosed above is a method in which a predetermined amount of paint is supplied into a pipe after being cleaned, and coating is performed while rolling a ball. Not only is not explained in detail,
The state after coating, that is, the dried state of the coating film, the adhesion strength, the film thickness, and the like are not disclosed. Further, it is disclosed that the coating means disclosed above supplies a paint in a spray state and forms a coating film by spraying. However, this prior art does not disclose the coating conditions such as the material and viscosity of the coating material itself, nor the dried state of the coating film or the state after coating such as adhesion strength and film thickness. Therefore, in the above prior art, since there is no specification of the paint and the painting is performed by rolling or spraying a ball, it is not possible to increase the viscosity of the paint, and accordingly, the paint film is formed at a predetermined thickness. If the amount of spraying is increased in order to avoid this problem, sagging will occur, and not only a predetermined film thickness cannot be formed uniformly, but also a large problem that a predetermined adhesion strength cannot be obtained. Furthermore, in the above-mentioned coating technology, the main material of the paint used is specified as "epoxy resin", suggesting that a material having a relatively high viscosity is used. There are no details such as a curing agent including a filler to be blended, and no disclosure is made of a curing speed of a paint required for an existing pipe of this kind. Therefore, in this conventional example, there is a problem in maintaining the uniformity of the coating film by the planned formation of the film thickness and the curing speed of the coating material.

[Means for Solving the Problems]

As a specific means for solving the problem of the conventional example, the present invention adds a small amount of filler and finely divided silica, and has a molecular weight of 170
To 380, a temperature of 20 to 50 ° C. and a viscosity of 200 to 40,000 cps, a main agent comprising a liquid epoxy resin of bisphenol A type, a modified amine adduct, a filler, a pigment, and fine silica powder. Its viscosity is 200 ~ 40000cp at ~ 50 ℃
s, and the main agent and the curing agent are abbreviated.
1: It provides a lining paint used for rehabilitation of existing water supply pipes, characterized by being mixed in the range of 0.8 to 1.2 and being a solventless paint, and particularly each component of a main agent and a curing agent, Furthermore, by specifying the viscosity and the compounding ratio, it becomes a solventless paint, and is blown and stretched by vortexing air at various low pressures to form a coating film, and the coating film is a uniform film without a predetermined pinhole. It is formed under pressure and has excellent adhesion strength.

【Example】

Next, several examples of the paint of the present invention will be described. Example 1 Main ingredient wt% liquid epoxy resin 90.0 (bisphenol A type) Titanium oxide (TiO ₂ ) 9.9 Fine powder silica (SiO ₂ ) 0.1 100.0 wt% Curing agent Modified amine ducts 60.5 Constitution 29.3 (precipitable calcium carbonate, precipitating sulfuric acid (Barium) Pigment (red petroleum) 9.2 Fine silica powder (SiO ₂ ) 1.0 100.0 wt% Mixing ratio of main agent and curing agent = 100: 100 (weight ratio) Example 2 The same main agent and curing agent as in Example 1 were used. The mixing ratio was 100: 90 (weight ratio). Example 3 Main ingredient wt% liquid epoxy resin 90.0 (bisphenol A type) Titanium oxide (TiO ₂ ) 9.0 Fine silica (SiO ₂ ) 1.0 100.0 wt% Curing agent Modified amine adducts 60.5 Construct 30.5 (precipitable calcium carbonate, precipitating sulfuric acid (Barium) Pigment (red petroleum) 9.2 Fine silica (SiO ₂ ) 0.3 100.0 wt% Mixing ratio of main agent and curing agent = 100: 100 (weight ratio) Example 4 Using the same main agent and curing agent as in Example 3 above. The mixing ratio was 100: 85 (weight ratio). Example 5 Main ingredient wt% liquid epoxy resin 90.0 (bisphenol A type) Titanium oxide (TiO ₂ ) 9.5 Fine silica (SiO ₂ ) 0.5 100.0 wt% Curing agent Modified amine adducts 60.5 Structure 29.0 (precipitable calcium carbonate, precipitating sulfuric acid (Barium) Pigment (red petroleum) 9.5 Fine silica powder (SiO ₂ ) 1.0 100.0 wt% Mixing ratio of main agent and curing agent = 100: 100 (weight ratio) Example 6 The same main agent and curing agent as in Example 5 were used. The mixing ratio was 90: 100 (weight ratio). The filler (filler) listed in each of the above examples is
Only a small part, in addition, for example, magnesium oxide, manganese oxide, calcium carbonate, nickel oxide,
Select one or more of cobalt oxide, iron oxide, chromium oxide, lead red, ceramic, nickel, copper, fine powder aluminum, silica, asbestos, mica, quartz powder, cryolite, portland cement, limestone, baryta Can be used. In addition, the fillers listed as constitutions in the curing agent are also used by selecting an appropriate filler from the above-mentioned fillers in addition to the above-mentioned components, that is, precipitated calcium carbonate and / or precipitated barium sulfate. it can. The paint of each of the examples, the existing pipe of about 10 m as a sample material, after cleaning and cleaning the inside of the pipe, calculate the amount of paint capable of forming a predetermined film thickness inside the existing pipe in advance, About 10% more paint than that amount at about 25 ℃, about 7k
The coating was carried out by batch feeding with vortex air of g / cm ² , and then blown and spread. Twenty-four hours after the painting process, each test material was tested according to the following prescribed test method. The test results were as shown in Table 1. (1) Film thickness test The test material was divided into two parts, and an electromagnetic film thickness meter Sanko SL-200
(Manufactured by Sanko Electronics Research Laboratories) to measure three arbitrary points. (2) Pinhole test The presence or absence of a pinhole was measured at a voltage of 1.0 KV using a dry pinhole tester TRC-20A (manufactured by Sanko Electronics Laboratory). (3) Hardness test According to JWWA G-122 ... 5.2.8, the coating film was scratched at an angle of about 45 ° using a pencil, and the hardness was measured. (4) Adhesion test According to ISO 4642, the test tube is divided into two parts and a dolly of 2 cmΦ is adhered to the coating film with a strong epoxy resin adhesive. And the adhesion strength was measured.

【The invention's effect】

As described above, the lining paint used for rehabilitation of the existing water supply pipe according to the present invention has a small amount of filler and finely divided silica, a molecular weight of 170 to 380, and a temperature of 20 to 50.
At 200 ° C., a main agent comprising a bisphenol A type liquid epoxy resin having a viscosity in the range of 200 to 40,000 cps, and a modified amine adduct, a filler, a pigment, and finely divided silica are added.
At a temperature of 5050 ° C., the viscosity is in the range of 200 to 40,000 cps, and the base material and the curing agent are mixed in a range of approximately 1: 0.8 to 1.2 to form a solvent-free paint, thereby providing an existing water supply. After removing and cleaning the inside of the pipe without removing it, a predetermined amount of paint is collectively injected with vortex air and blown out to form a coating film. The formed coating film is formed substantially uniformly without sagging, and has an excellent effect that a coating film having excellent adhesion strength can be formed. In addition, by using the paint of the present invention, the coating process can be performed at substantially normal temperature, and the curing time of the coating film can be shortened.

Claims (4)

(57) [Claims] 1. A small amount of filler and finely divided silica are added, the molecular weight is 170-380, the temperature is 20-50 ° C, and the viscosity is 200-400.
A main agent consisting of a liquid epoxy resin of bisphenol A type in the range of 00 cps, a filler, a pigment and finely divided silica are added to modified amine adducts, and the temperature is 20 to 50 ° C and the viscosity is 200.
A lining used for rectifying an existing water supply pipe, comprising a curing agent in the range of ~ 40000 cps, wherein the main agent and the curing agent are mixed in a range of approximately 1: 0.8 to 1.2 to form a solventless paint. Paints. 2. The filler in the base material is titanium oxide, magnesium oxide, manganese oxide, calcium carbonate, nickel oxide, cobalt oxide, iron oxide, chromium oxide, lead tin, ceramic, nickel, copper, fine powder aluminum, silica, The lining paint used for correcting an existing water supply pipe according to claim 1, wherein the paint is selected from one or more of asbestos, mica, quartz powder, cryolite, Portland cement, limestone, and baryta. 3. The lining paint according to claim 1, wherein the filler in the curing agent is settled calcium carbonate and / or settleable barium sulfate. 4. The lining paint according to claim 1, wherein the finely divided silica is calcined.