JPH01125311A - Algicidal germicide - Google Patents

Abstract

PURPOSE:To obtain an algicidal germicide, containing monovalent silver ions capable of directly acting on microbial cells and sterilizing algae or bacteria as a principal ingredient and polyacrylic acid as an adjuvant and dispersant and using phytic acid without any biological damaging properties as an adjuvant in a solution. CONSTITUTION:An algicidal and germicide containing silver nitrate as a principal ingredient and phytic acid (hexaphosphoric ester of myoinositol which is one of organic phosphoric acid compounds abundantly present in the vegetable kingdom) as an adjuvant and polycrylic acid (useful as antiscales and cooling water circuit scale inhibitor) as an adjuvant and dispersant in a solution with >=0.085ppm Ag<+> ion concentration in the solution. The resultant algicidal germicide is used for sterilizing and preventing algae in cooling towers, water tanks on high ground, water storage tanks, pools, solar systems and water culture and preventing putrefaction and controlling offensive smell of water-soluble oils, removing bacteria in cooling water channels, sewage treatment, semiconductor reverse osmosis (RO) membranes, etc. The above-mentioned algicidal germicide is readily handleable and capable of water control at a low cost.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an anti-algae disinfectant, and more specifically, to sterilization of cooling towers, elevated water tanks, water tanks, swimming pools, solar systems, hydroponic cultivation, algae prevention, and water-soluble disinfectants. This invention relates to an anti-algae disinfectant used for preventing spoilage and removing bad odors from oil agents, cooling waterways, sewage treatment, removing bacteria from semiconductor R○ membranes, etc.

(Prior art and its problems) If bacteria or aquatic organisms occur in cooling towers, water storage tanks, pools, solar systems, irrigation water, cooling water of power plant condensers, etc. where fresh water is circulated or stored, sanitary problems may occur. This poses a serious problem in terms of economics and management.

For example, when large amounts of bacteria occur in a cooling tower, they form gelatin-like lumps, combine with other solids to form slime, and stick to the inner walls of tanks and pipes, causing local corrosion and pitting. In addition, algae grows in large quantities in areas exposed to light such as spray bonds, fillers, vessels, etc., which obstructs water flow and causes pitting. In order to prevent and remove the slime and algae, conventional methods include filtration using filters, adsorption using porous materials such as zeolite, and disinfection using chemicals such as organic tin compounds, but these methods are not perfect. I can't say that.

On the other hand, as pools are used more frequently, problems such as water pollution due to abnormal proliferation of Escherichia coli and a decline in purification function due to the growth of algae become a problem. Chlorine disinfection is carried out to prevent water pollution in swimming pools, but high chlorine concentrations can cause harm to the human eyes and pharynx, and bleaching of swimsuits, leading to restrictions on its use. becomes.

Therefore, in order to solve the above-mentioned conventional drawbacks, the present applicant and others have solved the above-mentioned problems by using a water-soluble glass containing monovalent Ag decaion and having excellent sterilization and microbicidal properties wrapped in water-permeable cloth etc. (Patent application 1986-17)
No. 9415 and Japanese Patent Application No. 183055/1983). However, this silver glass water treatment agent has a low dissolution rate of soluble glass and Ag+ ions are gradually and continuously eluted from its surface, so it is not suitable for temporary non-circulating water channels or high levels of silver ions. In highly contaminated treated water systems that require high concentration,
It was unsuitable because the elution concentration of silver ions was low. Further, there is a drawback that impurities that are included in the glass component of the base material and are unavoidable in glass production are also eluted together with the silver ions. Therefore, the present inventor used the same <Ag” ion to prevent algae.
We have developed a non-glass-based, usually aqueous solution type agent that is the main ingredient for sterilization, and is suitable not only for circulatory systems but also for non-circulating cooling channels, sewage treatment, and the removal of bacteria from semiconductor RO membranes, and is a low-cost prevention agent. We are trying to provide an algae disinfectant here.

(Means for solving problems) The present invention will now be described in detail to achieve the above objects.

That is, the algae-preventing fungicide of the present invention contains silver nitrate as a main agent, phytic acid as an auxiliary agent, and polyacrylic acid as an auxiliary agent and a dispersant in a solution, and the concentration of Ag+ ions in the solution is 0. It is characterized by being 0'85 ppm or more.

It is well known to those skilled in the art that the monovalent silver ions used in the present invention are effective in killing bacteria and aquatic organisms, so a detailed explanation will be omitted.

Phytic acid is a hexaphosphoric acid ester of myo-inositol, and is an organic phosphoric acid compound that is abundant in the plant kingdom. Phytic acid is a substance that has been known for a long time, but its chemical structure, biosynthetic pathway, etc. have not yet been clearly demonstrated.

Anderson's formula C6H111○24P6 is most often used, but Neuberg's formula CG H24
There are many researchers who support 017p6.

A considerable amount is also present in the bulb.

Phytic acid is used to prevent the formation of struvite in canned salmon, trout, crab, shrimp, and tuna, and to prevent blackening of canned clams and shellfish. Sodium phytate is used as a softener for hard water, and as an anticorrosive agent for iron. There are also documents.

The phytic acid aqueous solution acts as an acid, and the relationship between its concentration and PH is shown in Table 1.

(Left below) Next, the polyacrylic acid used in the present invention is a polymer with a relatively low degree of polymerization (molecular weight) that has a basic skeleton of "acrylic acid" (CH2=CH-COOH), which is an organic acid. be. This low-molecular-weight polyacrylic acid copolymer is said to have excellent thermal stability, appropriate chelating ability and dispersion ability, and an outstanding crystal distortion effect on scale components in aqueous solutions, and will be used in can cleaning agents and cooling water in the future. This substance is also attracting attention as a circuit scale inhibitor.

Since phytic acid is a strong acid, it is also useful to make it neutral or weakly acrylic by using a suitable pH adjuster to improve the bactericidal action of Ag+ ions. As this adjusting agent, sodium bicarbonate or the like is used.

In a preferred embodiment of the present invention, silver nitrate, phytic acid, and polyacrylic acid are each adjusted to an aqueous solution, and the pH of the entire solution is maintained at about 7.0 to 8.5 before use. Because solution-type solutions are added to the water system to be treated according to conventional dosing methods at effective concentrations or higher, their disinfection ability is more rapid than that of the glass-based prior art. As is clear from the test results described below, the minimum required A g t ion concentration for the liquid formulation is 0.085.
It is more than ppm, and if it is less than that, almost no effect is exhibited.

(Action) Silver nitrate AgN○ and monovalent silver ion Ag+ in aqueous solution act directly on living cells to kill bacteria and algae, and the Ag't ion concentration required for sterilization and algae prevention is It also depends on the water conditions and the number of microorganisms in the water. Also, the sterilizing ability of this aqueous solution is greater when the water temperature is higher than when it is low.
Furthermore, the effect is greater when the pH is alkaline than acidic.

According to Anderson's structural formula, phytic acid is 18
(OH) groups, which envelop AgOH ionized in the solution, suppressing unstable Ag+ ions from oxidizing and changing to Ag2O, and promoting stable generation of Ag ions. to improve the sustainability of the bactericidal effect.

Polyacrylic acid has a carboxyl group (COO-) in its side chain and forms various salts, so the degree of dissociation (CC0) can be controlled, and in addition to acting as a dispersant, it can also be used as a can cleaner agent and in cooling water circuits. It also acts as an anti-scaling agent.

(Example) The present invention will be described in detail below.

Dissolve 0.80g of AgN in distilled water IQ to prepare liquid A.

Mix phytic acid IQ with A solution to make B solution.

Adjust the pH of solution B to 8.5 with sodium bicarbonate to obtain solution C.

Mix polyacrylic acid IQ with liquid C to make liquid D.

Dilute solution D with distilled water to obtain 3 (l) of Ag-phytic acid solution.

The Ag concentration in this example is 8 AgNo3 in the 30ρ solution.
Since 0gr is mixed in, the Ag equivalent concentration is 80g from its molecular weight X (107,88/169.88) =
It becomes 50.8g, and if you look at the ice, 50.8g/30.0OOcc = O,0017g/
cc.

Therefore, 100 p of liquid agent per 1 rri' of water to be treated.
The Agt ion concentration when using pm is 0.17 ppm.

Next, Table 2 lists the results of the bactericidal (algae-proofing) performance test of this Ag-phytic acid solution.

An Ag-phytic acid solution was added to the discharged water of the septic tank before sterilization, and the mixture was cultured in a desoxycholate medium at 36±1° C., and the number of common bacteria was measured.

(Left below) From the table above, the addition amount is 50 ppm (Ag + ion concentration 0.0
85 ppm) or higher, it was found to have bactericidal ability.

Table 2 is a bactericidal effect test, and since the bacteria that make up algae receive and generate light energy, if no bacteria are detected, it means that no algae will grow either. Therefore, it can be said that it is also effective against algae prevention.

(Effect) As described above, the algae-preventing fungicide of the present invention is a monovalent Ag″′ that directly acts on microbial cells to kill algae and bacteria.
It has ions as its main component, is non-glass-based, and is usually prepared as an aqueous solution, and has excellent fast-acting properties because it is injected into the water system to be treated. In addition, this anti-algae fungicide uses the organic acid phytic acid as an auxiliary agent, so it is not harmful to living organisms, and it also contains many (OH) groups of phytic acid and carboxyl groups (CO2-) of polyacrylic acid. ) promotes the stable production of Ag' ions, so it can be used not only in circulatory systems, but also in non-circulating cooling water circuits, sewage treatment, and bacteria removal from semiconductor RO membranes.

Furthermore, it is easy to handle and has the advantage of being able to manage water at low cost.

One or more applicants Kinki Pipe Giken Co., Ltd. Agent Patent attorney (6235) Hidehiko Matsuno Procedural amendment (0 劃 1, Indication of case 1984 Patent Application No. 284700 2, Name of invention: Anti-algae fungicide 3) , Relationship with the case of the person making the amendment Patent Applicant Address 743 Nishibashizume-cho, Gojo Kawaramachi-dori, Shimogyo-ku, Kyoto Name Kinki Pipe Giken Co., Ltd. Representative: Tadashi Tsuji 4, Agent Address: 550 06-443-4990 7559 5. Date of amendment order (voluntary) "Detailed description of the invention" column of the specification.

8. Contents of correction

Claims (1)

[Claims] The solution contains silver nitrate as a main agent, phytic acid as an auxiliary agent, and polyacrylic acid as an auxiliary agent and a dispersant, and the concentration of Ag^+ ions in the solution is 0.085 ppm or more. An anti-algae disinfectant.