JP2006234348A - Cleaning method of air conditioning duct and cleaned air conditioning duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning method of an air conditioning duct of high cleaning effect and superior work efficiency, and the air conditioning duct cleaned by the method. <P>SOLUTION: A hollow molding composed of an elastic polymer is inserted into the air conditioning duct, and pressure is applied from an inner face side of the molding to bring an outer face of the molding in close contact with an air conditioning duct wall, thus the air conditioning duct is cleaned. An antibacterial agent, a fungicide or a growth inhibitor may be kneaded in the hollow molding and/or applied to a surface of an inner face of the hollow molding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for cleaning an air conditioning duct, and more particularly, to a method for cleaning an air conditioning duct by forming a clean inner surface made of a stretchable polymer inside the air conditioning duct.

  When existing air-conditioning ducts are contaminated with dust, bacteria, mold, etc., it was usual to renew the ducts and clean the inside. However, in the case of a new update, the construction period for the new update is long and a large amount of money is required.

  Further, in the case of internal cleaning, it has been common to beat with a hammer, blow off with pressurized air, or wash with water (Patent Documents 1 and 2). In this case, it was virtually impossible to clean the complicated interior completely. In addition, when dusting or blowing off with pressurized air, it is inevitable that dust will leak into the room during the removal process and contaminate the indoor atmosphere. Measures against bacteria, molds, etc. were necessary, and this measure was difficult. In the case of washing with water, drying is necessary as a measure against water leaking from the duct, and measures against bacteria and mold after washing, and it is difficult to prevent water leakage from inside the duct and to dry completely. Therefore, conventional cleaning methods have not been satisfactory for building users and owners.

JP-A-9-290226 Japanese Utility Model Publication No. 6-52981

  An object of the present invention is to provide a method for cleaning an air-conditioning duct having a good cleaning effect and excellent workability, and an air-conditioning duct cleaned by the method.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors can easily clean if a new polymer layer can be formed inside the air-conditioning duct. More specifically, the present invention is formed from a stretchable polymer. A hollow molded body is inserted into the air conditioning duct, pressure is applied to the molded body from the inner surface side, the outer surface of the molded body is brought into close contact with the air conditioning duct wall, and the molded body forms a clean inner surface. The present invention has been found.

  That is, in the present invention, a hollow molded body formed of a stretchable polymer is inserted into an air conditioning duct, pressure is applied to the molded body from its inner surface side, and the outer surface of the molded body is applied to the air conditioning duct wall. Provided is a method characterized in that an air-conditioning duct is cleaned by close contact. The present invention also provides an air conditioning duct that has been cleaned by the above method.

  According to the present invention, a stretchable and clean polymer layer is formed on the inner surface of an existing duct, so that dust, bacteria, and fungi that have accumulated inside the existing duct can be isolated, Excellent clean effect can be obtained. In addition, the present invention allows a hollow molded body that is stretchable by air pressure or the like to be inserted into an existing duct, inflated by air pressure, and closely attached to the existing duct wall. Excellent workability. Of course, a polymer layer may be formed in advance in the interior of a new air conditioning duct by the method of the present invention.

  According to the method of the present invention, a hollow molded body formed of a stretchable polymer is inserted into an air conditioning duct, pressure is applied to the molded body from the inner surface side, and the outer surface of the molded body is in close contact with the inner wall of the air conditioning duct. By doing so, the air conditioning duct is cleaned.

  The stretchable polymer employed in the method of the present invention is not particularly limited as long as the hollow molded body can substantially adhere to the inner wall of the duct when air pressure is applied from the inner surface side of the hollow molded body. From the viewpoint of making the adhesion to the air-conditioning duct as good as possible and allowing adhesion with less air pressure, use a polymer having a breaking elongation measured according to JIS K7113 of 300% or more, preferably 400% or more. It is desirable.

  Specific examples of the polymer include polyurethane resin, polyethylene resin, polypropylene resin, polyester elastomer, rubber and the like. Among these polymers, a low melting point polyurethane resin and a low density polyethylene resin are preferable in consideration of elongation, film strength after adhesion, and glass transition temperature.

  In the case of forming a hollow molded body from the above polymer, the polymer is molded into a hollow pipe by, for example, blow molding. The thickness of the molded body varies slightly depending on the type of polymer used, but is preferably about 0.05 mm to 2.0 mm. If the thickness of the molded body is about 0.05 mm or more, there is no risk of the polymer film being broken by the protrusions in the duct, and if the thickness of the molded body is about 2.0 mm or less, it is expanded in the duct. The required pressure is not too high.

  The breaking strength of the polymer sheet is preferably 15 MPa or more. When the breaking strength of the sheet is 15 MPa or more, even when a thin molded body is used, it can be applied without breaking the molded body or opening a hole when air pressure is applied.

  When the hollow molded body is brought into close contact with the inner wall of the duct, the hollow molded body is first inserted into the air conditioning duct. Next, air pressure is applied to the hollow molded body from the inner surface side of the hollow molded body using a compressor or the like, thereby bringing the outer surface of the molded body into close contact with the inner wall of the duct. The thickness of the polymer sheet when closely attached to the duct wall is preferably 0.01 mm or more.

If you want to increase the adhesion between the stretchable polymer and the duct wall, apply a thermosetting resin to either or both of the air conditioning duct wall inner surface and the hollow molded body outer surface, and then apply the above method. It may be cured after adhesion. If the resin between the stretchable polymer and the duct wall is cured, the adhesion is further increased. Examples of the thermosetting resin applied in this case include an epoxy resin, an unsaturated polyester resin, a vinyl ester resin, and a methyl methacrylate resin. When applying a thermosetting resin, the application method is not particularly limited, and the thermosetting resin may be applied by a known method. As a coating amount of the thermosetting resin, it is sufficient that the adhesion between the stretchable polymer and the duct wall is high, and a range of 50 to 500 g / m ² is preferable. The applied thermosetting resin may be cured with hot air as necessary.

  Further, in order to prevent the growth of microorganisms, an antibacterial agent, antifungal agent or growth inhibitor may be kneaded into the hollow molded body and / or applied to the inner surface of the hollow molded body. Examples of antibacterial agents applied in this case include inorganic antibacterial agents such as silver and copper as antibacterial agents, organic nitrogen sulfur halogen compounds and organic nitrogen sulfur compounds as antifungal agents, and microorganisms. Examples of the growth inhibitor include a polymer obtained by polymerizing a monomer composition containing a phosphorylcholine-like group-containing monomer represented by the following general formula (1).

（ただし、式中、Ｘは２価の有機残基を示し、Ｙは炭素数１〜６のアルキレンオキシ基を示し、Ｚは水素原子もしくはＲ^５−Ｏ−（Ｃ＝Ｏ）−（ただし、Ｒ^５は炭素数１〜１０のアルキル基または炭素数１〜１０のヒドロキシアルキル基を示す）を示す。また、Ｒ^１は水素原子もしくはメチル基を示し、Ｒ^２、Ｒ^３及びＲ^４は同一もしくは異なる基であって、水素原子、炭素数１〜６のアルキル基またはヒドロキシアルキル基を示す。ｍは０または１を示す。ｎは１〜４の整数である。）

(Wherein, X represents a divalent organic residue, Y represents an alkyleneoxy group having 1 to 6 carbon atoms, Z represents a hydrogen atom or R ⁵ —O— (C═O) — (where R ⁵ represents an alkyl group having 1 to 10 carbon atoms or a hydroxyalkyl group having 1 to 10 carbon atoms, R ¹ represents a hydrogen atom or a methyl group, and R ² , R ³ and R ⁴ are the same. Or a different group, which represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or a hydroxyalkyl group, m represents 0 or 1, and n is an integer of 1 to 4.

  Specific examples of the phosphorylcholine-like group-containing monomer include 2-((meth) acryloyloxy) ethyl-2 ′-(trimethylammonio) ethyl phosphate and 3-((meth) acryloyloxy) propyl. -2 '-(trimethylammonio) ethyl phosphate, 4-((meth) acryloyloxy) butyl-2'-(trimethylammonio) ethyl phosphate, 5-((meth) acryloyloxy) pentyl-2 '-(trimethyl) Ammonio) ethyl phosphate, 6-((meth) acryloyloxy) hexyl-2 ′-(trimethylammonio) ethyl phosphate, 2-((meth) acryloyloxy) ethyl-2 ′-(triethylammonio) ethyl phosphate, 2-((Meth) acryloyloxy) ethyl- '-(Tripropylammonio) ethyl phosphate, 2-((meth) acryloyloxy) ethyl-2'-(tributylammonio) ethyl phosphate, 2-((meth) acryloyloxy) ethyl-2 '-(tricyclohexyl Ammonio) ethyl phosphate, 2-((meth) acryloyloxy) ethyl-2 ′-(triphenylammonio) ethyl phosphate, 2-((meth) acryloyloxy) ethyl-2 ′-(trimethanolammonio) ethyl Phosphate, 2-((meth) acryloyloxy) propyl-2 ′-(trimethylammonio) ethyl phosphate, 2-((meth) acryloyloxy) butyl-2 ′-(trimethylammonio) ethyl phosphate, 2-(( (Meth) acryloyloxy) pentyl-2 -(Trimethylammonio) ethyl phosphate, 2-((meth) acryloyloxy) hexyl-2 '-(trimethylammonio) ethyl phosphate, 2- (vinyloxy) ethyl-2'-(trimethylammonio) ethyl phosphate, 2 -(Allyloxy) ethyl-2 '-(trimethylammonio) ethyl phosphate, 2- (p-vinylbenzyloxy) ethyl-2'-(trimethylammonio) ethyl phosphate, 2- (p-vinylbenzoyloxy) ethyl- 2 '-(trimethylammonio) ethyl phosphate, 2- (styryloxy) ethyl-2'-(trimethylammonio) ethyl phosphate, 2- (p-vinylbenzyl) ethyl-2 '-(trimethylammonio) ethyl phosphate , 2- (Vinyloxycarbo Nyl) ethyl-2 ′-(trimethylammonio) ethyl phosphate, 2- (allyloxycarbonyl) ethyl-2 ′-(trimethylammonio) ethyl phosphate, 2- (acryloylamino) ethyl-2 ′-(trimethylammonio) ) Ethyl phosphate, 2- (vinylcarbonylamino) ethyl-2 '-(trimethylammonio) ethyl phosphate, ethyl- (2'-trimethylammonioethylphosphorylethyl) fumarate, butyl- (2'-trimethylammonioethylphosphoryl) Ethyl) fumarate, hydroxyethyl- (2′-trimethylammonioethyl phosphorylethyl) fumarate, ethyl- (2′-trimethylammonioethyl phosphorylethyl) malate, butyl- (2′-trimethylammonioethylphos) Riruechiru) malate, hydroxyethyl - (2'-trimethylammonio ethyl phosphoryl ethyl) maleate, and the like.

  Among these, 2-((meth) acryloyloxy) ethyl-2 ′-(trimethylammonio) ethyl phosphate is preferable, and 2- (methacryloyloxy) ethyl-2 ′-(trimethylammonio) ethyl phosphate (hereinafter referred to as MPC). (Omitted) is more preferable in terms of availability and the effect of preventing the growth of microorganisms.

  When polymerizing a phosphorylcholine-like group-containing monomer, one of the aforementioned phosphorylcholine-like group-containing monomers can be used alone, or two or more kinds can be used as a mixture.

  In addition, when using a hollow molded article prepared by kneading the antibacterial agent, antifungal agent or growth inhibitor in advance with a stretchable polymer and using this, the blending amount thereof is based on 100 parts by mass of the polymer. 0.01 to 3.0 parts by mass is preferable. When the blending amount is too small, the effect of preventing the growth of microorganisms is insufficient. On the other hand, when the blending amount is too large, molding becomes difficult.

  According to the method of the present invention, it is possible to clean an air-conditioning duct that is contaminated with bacteria and fungi, and to obtain a cleaned air-conditioning duct without using a new duct renewal or internal cleaning method. Can do. Moreover, it is possible to newly install an air-conditioning duct that has been crushed by the method of the present invention. The method of the present invention can be applied to clean air conditioning ducts installed in hospitals, schools, factories, kitchens, buildings, houses, warehouses, vehicles, etc., or newly installed.

Examples and comparative examples

  Hereinafter, the present invention will be described more specifically with reference to the drawings using examples and comparative examples. However, the present invention is not limited to the following examples. FIG. 1 is an overall view of an air conditioning duct, and FIGS. 2A to 2C are views for explaining a method for cleaning the air conditioning duct.

Example 1
The flange (5) of the side pipe (6) of the main pipe air-conditioning duct (4) with a 1 m square section made of galvanized iron plate that has been installed for 10 years has been split, and the plate (8) is applied to the main pipe wall. It was. Next, a hollow pipe (9) made of low-density polyethylene with a diameter of 50 cm and a thickness of 1 mm with a narrowed tip was fed into the duct with air at room temperature. When the tip reaches a dead end, switch to warm air of 80 ° C, inflate the polyethylene pipe to the duct wall, replace the air with room temperature air while maintaining pressure, cool the pipe, and heat-fix the polyethylene pipe did. The same operation was performed from the end side of the side pipe, the polyethylene film covering the flange portion was cut off, and the flange was joined. After joining, the fan (2) was turned, and the number of dust in the air discharged from the air outlet (7) of the air conditioner was measured with a dust measuring device. As a result, it was 1000 per cubic foot. In addition, it was 100,000 before construction.

(Example 2)
A polymer comprising an MPC made by Nippon Oil & Fats Co., Ltd. dissolved in a water / ethanol = 50/50 (mass%) solution inside a hollow pipe made of polyurethane having a diameter of 50 cm and a thickness of 1 mm (Lipidure (registered trademark) )) 100 g per square meter of 1% by weight solution was applied and dried. As in Example 1, the flange (5) of the side pipe (6) of the main pipe air-conditioning duct (4) with a length of 100 m of a 1 m square section made of galvanized iron plate 10 years after installation was divided into the main pipe wall. I applied the counter board (8). Next, a hollow pipe (9) made of polyurethane with a diameter of 50 cm and a thickness of 1 mm was sent into the duct with air at room temperature. When the tip reaches a dead end, switch to hot air of 100 ° C, inflate the polyurethane pipe to the duct wall, replace the pressure with air at room temperature, cool the pipe, and heat-fix the polyurethane pipe did. The same operation was performed from the end side of the side pipe, and the polyurethane film covering the flange portion was cut out to join the flange. After the joining, the fan (2) was turned and the number of dust in the air discharged from the air outlet (7) was measured. As a result, it was 1000 per cubic foot. In addition, it was 100,000 before construction. Although this duct was used continuously for 3 years, molds did not grow on the polyurethane membrane.

  According to the present invention, it is possible to provide a method for cleaning an air-conditioning duct having a good cleaning effect and excellent workability, and an air-conditioning duct cleaned by the method.

It is an air conditioning duct whole figure. It is a figure explaining the cleaning method of an air-conditioning duct. (A) The figure which shows the state which inserted the hollow pipe (b) The figure which shows the state which expanded the hollow pipe and was made to contact | adhere to the duct wall (c) The completed figure which also covered the side pipe

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake port 2 Fan 3 Filter 4 Main pipe 5 Flange or inspection port 6 Side pipe 7 Outlet 8 Counterplate 9 Hollow pipe 10 Air-conditioning duct

Claims (5)

A hollow molded body formed of a stretchable polymer is inserted into an air conditioning duct, pressure is applied to the molded body from the inner surface side, and the outer surface of the molded body is brought into close contact with the air conditioning duct wall. A method characterized by cleaning. The method according to claim 1, wherein the breaking elongation of the polymer measured based on JIS K7113 is 300% or more. The method according to claim 1 or 2, wherein a thermosetting resin is applied to either the inner surface of the air conditioning duct, the outer surface of the hollow molded body, or both, and is cured after adhesion. The method according to any one of claims 1 to 3, wherein the antibacterial agent, antifungal agent or growth inhibitor is kneaded into the hollow molded body and / or applied to the inner surface of the hollow molded body. The air-conditioning duct cleaned by the method of any one of Claims 1-4.

Images