KR101035436B1 - Cleaner for water supply and drain pipe - Google Patents

Abstract

PURPOSE: A non-toxic cleaning solution for water supplies and drain pipes is provided to effectively remove various kinds of scales, avoid the use of toxic materials such as inorganic acids and hydrogen peroxide, and increase the dissolution velocity of the scales. CONSTITUTION: A non-toxic cleaning solution for water supplies and drain pipes includes 100.0 parts by weight of organic acid and 0.5-5 parts by weight of dodecylglycerol polyethoxylate represented by chemical formula 1. In chemical formula 1, R is C12 alkyl group; m and n is an integer; and m+n= 2-10. The organic acid comprises 100.0 parts by weight of citric acid, 5-15 parts by weight of ascorbic acid, 70-180 parts by weight of gIycolic acid, 10-70 parts by weight of oxalic acid, and 70-180 parts by weight of gluconic acid.

Description

Cleaner for water supply and drain pipe

The present invention relates to a water supply pipe cleaning liquid, and more particularly, to a water supply pipe cleaning liquid capable of chemically cleaning a water supply pipe or a drain pipe to effectively remove scales formed inside the pipe.

A water supply pipe refers to a pipe used to supply drinking water or domestic water, and a drain pipe refers to a pipe used to discharge water used for a specific purpose. The water supply and drainage pipe is generally manufactured in the form of a pipe having a certain diameter, and the most widely used one is made of steel or a material in which zinc is plated on the surface of the steel. Such a water supply and drainage pipe may cause corrosion on the surface as the service life increases, and calcium and magnesium components contained in tap water may be deposited in the form of carbonate. If corrosion occurs in the water supply and drainage pipes, water leakage may occur due to damage to the pipes, and rust, such as carbonate or iron oxide, may be deposited inside the pipe, thereby reducing the cross-sectional area of the water supply and deteriorating the original function of the water supply and drainage pipe.

The compound deposited on the inner surface of the water supply and drainage pipe is called scale. In the water supply pipe, calcium carbonate and magnesium carbonate in which calcium ions and magnesium ions dissolved in tap water are deposited in the form of carbonate are mainly used. Iron oxide formed by oxidizing iron on the surface of the drain pipe may be a component of the scale. Increasing the amount of deposition on the scale reduces the water supply and drainage capacity, and in severe cases, the pipe may be blocked and lose its original function. The method of removing scale from the water supply and drain pipe can be divided into physical and chemical methods.

Among the physical methods, the poly-pig method is a method of removing scales by injecting poly-pig, a shell-shaped washing machine serving as a scrubber, into a tube. Shock wave method is a method to remove the scale by the impact due to the contraction and expansion of the air layer by supplying water and air that is automatically controlled in the pipe in a short circuit. Another physical method, the air sand method, is a method of mixing sand with compressed air and spraying it into the tube at high pressure. However, the pipe washing by such a physical method may cause breakage and leakage of the pipe, and a post-cleaning process may be required and may not be effective in removing hard scales.

Chemically washing the tube is a method of removing the scale inside the tube by decomposing the scale using a highly soluble material such as hydrochloric acid. As a prior document on the chemical cleaning method, there may be mentioned Korean Patent No.808373. The preceding document relates to a cleaning agent for removing iron oxide and zinc oxide attached to the inner wall of an indoor water supply pipe, and includes 5-10 wt% citric acid, 1-10 wt% oxalic acid, 1-10 wt% malic acid, 0.1-1 wt% phosphoric acid, and 5-5 hydrochloric acid. A technique relating to a cleaning liquid containing 15 wt%, hydrogen peroxide 1 to 2 wt%, LAE 0.01 to 0.1 wt%, ascorbic acid 0.01 to 0.1 wt% is disclosed. However, this prior art uses a toxic inorganic acid such as phosphoric acid, hydrochloric acid, and hydrogen peroxide also has a problem that it can pollute the environment. Therefore, there is a great need to develop a supply and drainage pipe cleaning liquid that can effectively remove various types of scales and ensure environmental friendliness.

Therefore, the problem to be solved by the present invention is that it can effectively remove various types of scales without including toxic substances such as inorganic acids and hydrogen peroxide, and can improve the wettability of the cleaning liquid to increase the dissolution rate of the scales. It is to provide a drain pipe cleaning liquid.

In order to achieve the above object, the present invention provides a water supply pipe washing liquid containing 100 parts by weight of an organic acid and 0.5 to 5 parts by weight of dodecylglycerol polyethoxylate represented by the following formula (1).

Formula 1

(R is an alkyl group having 12 carbon atoms, m, n is an integer, m + n = 2 to 10)

According to another embodiment of the present invention, the organic acid may include 100 parts by weight of citric acid, 5 to 15 parts by weight of ascorbic acid, 70 to 180 parts by weight of glycolic acid, 10 to 70 parts by weight of oxalic acid and 70 to 180 parts by weight of gluconic acid. have.

According to another embodiment of the present invention, the water supply and drainage pipe washing liquid may further include dodecylglycerol.

Since the reservoir cleaning liquid of the present invention contains organic acids such as citric acid, ascorbic acid and glycolic acid as a main component, it is environmentally friendly and has a non-ionic surfactant, dodecylglycerol ethoxylate, which has an effect of improving the scale removal rate by improving wettability. . In addition, dodecylglycerol having an antimicrobial effect is included to remove the bacteria living in the tube.

1 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-5 synthesized in accordance with an embodiment of the present invention.
2 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-7 synthesized in accordance with an embodiment of the present invention.
3 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-10 synthesized in accordance with an embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The water supply pipe cleaning liquid of the present invention comprises 100 parts by weight of an organic acid and 0.5 to 5 parts by weight of dodecylglycerol polyethoxylate represented by the following formula (1).

Formula 1

(R is an alkyl group having 12 carbon atoms, m, n is an integer, m + n = 2 to 10)

The drainage pipe cleaning liquid of the present invention includes water, an organic acid, and dodecylglycerol polyethoxylate. Contamination of the water supply and drainage pipes is caused by contamination by scale deposition, contamination by organic matter, and contamination by bacteria. Since water passes through the inside of the water supply and drainage at a high flow rate, contamination by scale deposition such as carbonate is the biggest problem rather than contamination by organic matter or bacteria. The organic acid included in the water supply and drainage tube cleaning liquid of the present invention is a main component for dissolving and removing the scale, and can be adjusted at various concentrations and composition ratios in consideration of the type and amount of the scale. Water becomes a basic solvent of the cleaning liquid, and a relatively small amount of water is mixed to store the cleaning liquid, and during the washing, additionally, water is mixed to use the cleaning liquid at an appropriate concentration. Dodecylglycerol polyethoxylate is a nonionic surfactant that removes organic contaminants from inside the pipe and improves the wettability of the scale surface and cleaning solution, and the cleaning solution is smoothly moved to the internal space of the scale that has grown into a porous structure. So that it can be supplied.

Organic acids include citric acid, ascorbic acid, glycolic acid, oxalic acid and gluconic acid as its components. Since these organic acids are less toxic than inorganic acids such as hydrochloric acid or phosphoric acid, they have the effect of preventing environmental pollution due to the use of cleaning liquids. Supply to drinking water can be prevented. The composition ratio of the organic acid may be variously changed, and the composition ratio may be selected as an appropriate mixing ratio according to the type and amount of scale formed inside the feed drain pipe. In particular, oxalic acid among the components of the organic acid has a great effect of removing iron oxide, so in the case of the supply and drain pipe having a large degree of corrosion, it is preferable to increase the amount of oxalic acid added. The preferred composition ratio of the organic acid is 100 parts by weight of citric acid, 5 to 15 parts by weight of ascorbic acid, 70 to 180 parts by weight of glycolic acid, 10 to 70 parts by weight of oxalic acid and 70 to 180 parts by weight of gluconic acid.

The water supply and drainage pipe cleaning liquid of the present invention is characterized by containing a nonionic surfactant called dodecylglycerol polyethoxylate. Dodecylglycerol polyethoxylates speed up the removal of scale formed inside the tube. The scale consists of non-leaving ionic binders such as calcium carbonate, magnesium carbonate or iron oxide. These scales can be dissolved and removed in the washing liquid by an acidic acid reaction with an organic acid. In order for the dissolution of the scale to occur quickly, the organic acid component must be effectively supplied to the surface of the scale. The scale is a precipitate of calcium ions, magnesium ions, and the like dissolved in water for a long time, and is coated on the pipe surface while having a porous structure. The present invention is characterized by improving the wettability of the cleaning liquid by adding dodecylglycerol polyethoxylate to the water supply pipe washing liquid to reduce the surface tension of the cleaning liquid and the scale surface. That is, the removal rate of the scale could be increased by improving the wettability of the cleaning solution so that the cleaning solution could effectively penetrate into the scale of the porous structure. Dodecylglycerol polyethoxylate is also believed to have the effect of increasing the contact area between the scale and the cleaning liquid by removing organic contaminants that may form on the scale surface. 0.5 to 5 parts by weight of dodecylglycerol polyethoxylate relative to 100 parts by weight of the organic acid is preferably added to the water supply pipe washing liquid of the present invention. The removal rate of the scale is improved until the amount of dodecylglycerol polyethoxylate is increased to a certain degree, but when the amount is exceeded, the effect of improving the removal rate is not large.

In the present invention, the dodecylglycerol polyethoxylate represented by the formula (1) was synthesized, and by using this, it was possible to develop an acidic detergent having excellent cleaning effect through blending with an organic acid. Dodecylglycerol polyethoxylate was synthesized by the following reaction scheme 1 (scheme 1). Referring to the following Synthesis Scheme 1, dodecylglycerol was synthesized by adding water to the epoxide under basic conditions and ring opening reaction, and ether chain was extended by adding ethylene oxide under basic conditions. Synthesized dodecylglycerol polyethoxylates.

Synthetic Scheme 1

In this case, dodecylglycerol polyethoxylates having different molecular weights may be synthesized according to the equivalent weight of ethylene oxide. For example, when 5 equivalents of ethylene oxide is added to 1 mole of dodecylglycerol, dodecylglycerol polyethoxylate-5 (DGO-5) is synthesized, and when 7 equivalents of ethylene oxide is added, dodecylglycerol polyethoxyl Rate-7 (DGO-7) is synthesized, and dodecylglycerol polyethoxylate-10 (DGO-10) can be synthesized when 10 equivalents of ethylene oxide is added. However, the compound produced when synthesizing the dodecylglycerol polyethoxylate by the above synthesis scheme 1 is not only one kind. For example, when 5 equivalents of ethylene oxide is added to 1 mole of dodecylglycerol, the main product is dodecylglycerol polyethoxylate-5 (DGO-5), but other products having different molecular weights May be present in proportion. In addition, some unreacted dodecylglycerol may be present in the product, which imparts antimicrobial activity to the reservoir cleaning liquid. The antimicrobial effect of dodecylglycerol has been known from the literature (H.S. Ved, et al, The J. Biological Chemistry, 259 (13), 8115-8121, (1984)). Therefore, when the product obtained through the synthesis scheme 1 is added to the water tank washing liquid as it is, the antimicrobial effect can be exerted on the washing liquid to maximize the washing effect. The washing ability is changed according to the composition ratio of the dodecylglycerol polyethoxylate contained in the detergent, and the preferred composition ratio is 100 parts by weight of organic acid and 0.5 to 5 parts by weight of dodecylglycerol polyethoxylate. If the content ratio of dodecylglycerol polyethoxylate is less than 0.5 parts by weight, the effect of improving the wettability by the surfactant is reduced, and the removal capacity of the scale is lowered. .

The reservoir cleaning liquid of the present invention may further include LX-94. LX-94 is a product name of a nonionic surfactant manufactured and sold by Hannong-Sung Co., Ltd., and is produced by copolymerizing ethylene oxide and propylene oxide. Since LX-94 is a low-foaming surfactant, it functions to suppress the generation of bubbles in the water tank cleaning operation. Therefore, the addition of an appropriate amount of LX-94 has the effect of suppressing the generation of bubbles in the reservoir cleaning liquid to increase the amount of dodecylglycerol polyethoxylate added. The amount of LX-94 added is preferably about 5 parts by weight or more based on 100 parts by weight of citric acid. This is because when the amount of LX-94 added is too small, the effect of inhibiting bubbles is small and dodecylglycerol polyethoxylate cannot be sufficiently added.

Hereinafter, the present invention will be described in more detail using examples. The embodiments are only intended to describe the present invention in more detail, and the scope of the rights is not limited by the embodiments, and the scope of the rights should be interpreted only by the matters described in the claims.

Example 1-1 (Synthesis of Dodecylglycerol Ethoxylate-5)

1 mole of dodecylglycerol (mw: 260) and 0.1 mole of potassium hydroxide (KOH) were added to a 1 liter high-pressure reactor, and 5 moles of ethylene oxide were maintained for about 6 hours while maintaining the reactor temperature in the range of 120 to 140 ° C. Reacted. Subsequently, after lowering the reaction temperature and the pressure to normal and normal pressure, potassium hydroxide (KOH) was neutralized with about 0.1 mole of acetic acid.

Example 1-2 (Synthesis of Dodecylglycerol Ethoxylate-7)

Synthesis was carried out in the same manner as in Example 1-1, except that the amount of ethylene oxide was changed to 7 mol.

Example 1-3 (Synthesis of Dodecylglycerol Ethoxylate-10)

Synthesis was carried out in the same manner as in Example 1-1, except that the amount of ethylene oxide was changed to 10 mol.

Example 2-1 (Preparation of Cleaning Liquid 1)

Washing liquid 1 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 2 g of GDO-10 in 360 g of water.

Example 2-2 (Preparation of Cleaning Liquid 2)

Washing liquid 2 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 5 g of GDO-10 in 360 g of water.

Example 2-3 (Preparation of Cleaning Liquid 3)

Washing liquid 3 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 10 g of GDO-10 in 360 g of water.

Example 2-4 (Preparation of Cleaning Liquid 4)

Washing liquid 4 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 2 g of GDO-7 in 360 g of water.

Example 2-5 (Preparation of Cleaning Liquid 5)

Washing solution 5 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 5 g of GDO-7 in 360 g of water.

Example 2-6 (Preparation of Cleaning Liquid 6)

Washing solution 6 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 10 g of GDO-7 in 360 g of water.

Example 2-7 (Preparation of Cleaning Liquid 7)

Washing liquid 7 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 20 g of oxalic acid, 100 g of gluconic acid, and 5 g of GDO-10 in 360 g of water.

Example 2-8 (Preparation of Cleaning Liquid 8)

Washing liquid 8 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 60 g of oxalic acid, 100 g of gluconic acid, and 5 g of GDO-10 in 360 g of water.

Comparative Example 1 (Preparation of Cleaning Liquid 9)

Washing liquid 9 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 0.5 g of GDO-10 in 360 g of water.

Comparative Example 2 (Preparation of Cleaning Liquid 10)

Washing liquid 10 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 20 g of GDO-10 in 360 g of water.

Comparative Example 3 (Preparation of Cleaning Liquid 11)

Washing liquid 11 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, 100 g of gluconic acid, and 20 g of GDO-7 in 360 g of water.

Comparative Example 4 (Preparation of Cleaning Liquid 12)

Washing liquid 12 was prepared by dissolving 100 g of citric acid, 10 g of ascorbic acid, 100 g of glycolic acid, 40 g of oxalic acid, and 100 g of gluconic acid in 360 g of water.

Table 1 below summarizes the components of the Examples and Comparative Examples.

TABLE 1

Assay Example 1 (of dodecylglycerol ethoxylate-5 ^One H NMR)

In order to confirm that dodecylglycerol ethoxylate-5 was synthesized according to Example 1-1, ¹ H NMR analysis was performed in a CDCl ₃ solution. 1 is a ¹ H-NMR measurement results of dodecylglycerol ethoxylate-5 synthesized in accordance with an embodiment of the present invention. Referring to Fig. 1, a characteristic peak of dodecylglycerol ethoxylate-5 is observed. From this it can be seen that the main product synthesized according to Example 1-1 is dodecylglycerol ethoxylate-5.

Assay Example 2 (of dodecylglycerol ethoxylate-7 ^One H NMR)

In order to confirm that dodecylglycerol ethoxylate-7 was synthesized according to Example 1-2, ¹ H NMR analysis was performed in a CDCl ₃ solution. Referring to FIG. 2, the properties of dodecylglycerol ethoxylate-7 Peaks are observed. From this it can be seen that the main product synthesized according to Example 1-2 is dodecylglycerol ethoxylate-7.

Assay Example 3 (of dodecylglycerol ethoxylate-10 ^One H NMR)

In order to confirm that dodecylglycerol ethoxylate-10 was synthesized according to Example 1-3, ¹ H NMR analysis was performed in a CDCl ₃ solution. Referring to FIG. 3, the properties of dodecylglycerol ethoxylate-10 Peaks are observed. From this it can be seen that the main product synthesized according to Example 1-3 is dodecylglycerol ethoxylate-10.

Experimental Example 1-1 (calcium carbonate removal experiment, 1 minute left)

Calcium carbonate removal ability was measured for the cleaning agents 1 to 12 prepared according to Examples and Comparative Examples. Calcium carbonate removal experiments were performed by adding calcium carbonate to the diluted cleaning solution and measuring unbalanced calcium carbonate after a certain period of time, and determining the difference in mass.Inductively Coupled Plasma / Mass Spectrometer (ICP) / MS) was used in parallel to measure the amount of calcium dissolved in the solution. Specific experimental conditions are as follows.

First, 100 ml of a 5% concentration of a washing solution was added to a beaker, 1 g of calcium carbonate (CaCO ₃ ) was added thereto, and then stirred for 2 to 3 times with a glass rod, followed by standing for 1 minute. At this time, the calcium carbonate was ground to an average diameter of about 100μm. Subsequently, calcium carbonate was separated from the solution using a filter paper, a separatory funnel and an aspirator, and the filter paper was dried to measure the mass of calcium carbonate. Table 2 below shows the difference in mass of calcium carbonate according to the type of cleaning solution. Referring to Table 2, while the amount of dodecylglycerol ethoxylate-10 added was increased from 0 g to 5 g, the dissolved amount of calcium carbonate increased together (washing liquid 9, washing liquid 1, washing liquid 2), and exceeded 10 g (cleaning liquid 3). There was no big difference. Dodecylglycerol ethoxylate-7 and dodecylglycerol ethoxylate-10 were found to have similar calcium carbonate removal capacities when the same amounts were added (washing liquids 1 to 6). In addition, it can be seen that the calcium carbonate removal ability is slightly improved when the amount of added oxalic acid is increased (washing solution 8).

Subsequently, the calcium carbonate separated solution was placed in an inductively coupled plasma / mass spectrometer (SPQ-9000, Seiko Instrument) to measure the concentration of calcium. Table 3 below shows the concentration of calcium measured by an inductively coupled plasma / mass spectrometer. Since the calcium ions dissolved in the solution are derived from the dissolution of calcium carbonate by the organic acid, the calcium concentration of the solution becomes proportional to the mass of calcium carbonate dissolved and removed. Referring to Table 3, it can be seen that the calcium concentration of the solution is generally inversely proportional to the calcium carbonate mass difference in Table 2.

TABLE 2

TABLE 3

Experimental Example 1-2 (calcium carbonate removal experiment, left for 10 minutes)

A calcium carbonate removal experiment was performed in the same manner as in Experiment 1-1, except that the solution was left for 10 minutes. The results are shown in Tables 4 and 5 below. Referring to Tables 4 and 5, as the amount of dodecylglycerol ethoxylate-10 added increased, the dissolution of calcium carbonate generally showed the same tendency as in Experimental Example 1-1, but the increase was increased. have. Since the calcium carbonate powder used in the experiment is finely ground to an average diameter of about 100 μm, it is expected that the diffusion of the cleaning solution into the space between the powders will not be active. These experimental conditions are to consider the porous structure of the calcium carbonate deposited in the water supply pipe, to confirm the effect of improving the wettability of the surfactant contained in the cleaning liquid. It is considered that the width at which the amount of dissolution of calcium carbonate is increased in Experimental Example 1-2 is larger than Experimental Example 1-1 due to the role of dodecylglycerol ethoxylate-10 as a surfactant. That is, dodecylglycerol ethoxylate-10 improves the wettability between the cleaning liquid and calcium carbonate to help the cleaning liquid easily penetrate into the space between the calcium carbonates.

Table 4

Table 5

Experimental example 2-1 (magnesium carbonate removal experiment, 1 minute left)

Calcium carbonate removal ability was measured for the cleaning agents 1 to 12 prepared according to Examples and Comparative Examples. The experiment was conducted in the same manner as in Experiment 1-1, except that 5 g of magnesium carbonate (MgCO ₃ ) was used instead of 1 g of calcium carbonate. Table 6 and Table 7 below show the experimental results. Referring to Table 6 and Table 7, the dissolution rate tendency of magnesium carbonate according to the type of cleaning liquid was similar to that of calcium carbonate. However, the dissolution rate of magnesium carbonate was much faster than that of calcium carbonate.

Table 6

TABLE 7

Experimental example 2-2 (magnesium carbonate removal experiment, left for 10 minutes)

A calcium carbonate removal experiment was performed in the same manner as in Experiment 2-1, except that the solution was left for 10 minutes. The results are shown in Tables 8 and 9 below. Referring to Table 8 and Table 9, the results of the removal experiment of magnesium carbonate also showed a similar tendency to the results of Experimental Example 1-2.

Table 8

Table 9

Experimental Example 3 (iron oxide removal experiment)

Iron oxide removal capacity was measured for the cleaning agents 1 to 12 prepared according to Examples and Comparative Examples. In the iron oxide removal experiment, the iron oxide powder was added to the diluted washing solution, and after a certain time, the iron oxide which was not dissolved was separated to measure the difference in mass. Specific experimental conditions are as follows.

First, 100 ml of a 5% concentration washing solution was added to a beaker, 1 g of powdered iron oxide (Fe ₂ O ₃ ) was added thereto, and then stirred for 2 to 3 times with a glass rod, followed by standing for 10 minutes. The iron oxide mass difference was measured in the same manner as in Example 1-1, and the results are shown in Table 10 below. Referring to Table 10, the removal rate of iron oxide was most sensitively dependent on the amount of oxalic acid added. Detergent 7 added with the least amount of oxalic acid had the slowest removal rate, and detergent 8 added with the highest amount was the fastest. However, the removal rate of iron oxide was very slow compared to calcium carbonate or magnesium carbonate.

Table 10

Claims (3)

100 parts by weight of organic acid; And
0.5 to 5 parts by weight of dodecylglycerol polyethoxylate represented by the following formula;

Formula 1

(R is an alkyl group having 12 carbon atoms, m, n is an integer, m + n = 2 to 10) The method according to claim 1,
The organic acid is 100 parts by weight of citric acid, 5 to 15 parts by weight of ascorbic acid, 70 to 180 parts by weight of glycolic acid, 10 to 70 parts by weight of oxalic acid and 70 to 180 parts by weight of gluconic acid cleaning water supply pipe. The method according to claim 1,
Water supply and drainage pipe cleaning liquid further comprising dodecylglycerol.

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