KR20200001398A - Coating liquid and coating method thereof - Google Patents

Abstract

The present invention relates to a coating liquid for forming a film capable of removing odor-causing substances. The coating liquid comprises: a film forming liquid; and 0.1 to 50 parts by weight of alcohol per 100 parts by weight of the film forming liquid, wherein the film forming liquid comprises: a polymer which forms fatty acid by decomposition or oxidization; and catalyst for generating hydrogen ions.

Description

Coating liquid and coating method thereof

The present invention relates to a coating liquid for forming a coating, and more particularly, to a coating liquid for removing odor-causing substances generated in the process of forming a coating.

When electronics such as air conditioners, refrigerators and dryers operate, they form a coating on the surface of the heat exchanger embedded in the electronics and on surfaces that are constantly exposed to moisture to protect the electronics.

In general, the coating may include a polymer. In addition, the polymer may be used by adjusting to suit the requirements of the object that the film is formed, including a variety of functional groups. The polymer may be decomposed or oxidized depending on the environment to form a substance causing odor.

In detail, nitrogen compounds including fatty acids and amines generated by decomposing or oxidizing a polymer may cause an odor. Decomposition or oxidation of the polymer may occur in the process of forming a film with a coating liquid containing the polymer. In particular, in the process of forming the film including the step of heating to a predetermined temperature, substances that cause odor are likely to be formed.

Thus, the present invention proposes a coating solution capable of removing a substance causing an odor generated by decomposition or oxidation of a polymer, and a coating method of forming a film with the coating solution.

One object of the present invention is to propose a coating liquid capable of removing odor-causing substances generated during the process of forming a film.

Another object of the present invention is to propose a coating method for forming a film with a coating liquid capable of removing odor-causing substances during the film forming process.

In the coating liquid for forming a film of the present invention, the coating liquid, a film forming liquid; And 0.1 to 50 parts by weight of alcohol per 100 parts by weight of the encapsulation liquid. Furthermore, the film-forming liquid is a polymer that decomposes or oxidizes to cause an odor; And it is characterized in that it comprises a catalyst for producing hydrogen ions.

In one embodiment, the polymer is poly-N-isopropylacrylamide (Poly (N-isopropylacrylamide), PNIPAM), polyacrylamide (Polyacrylamide, PAM), poly 2-oxazoline (Poly (2-oxazoline)) ), Polyethylenimine (PEI), Polyacrylic acid (Poly (acrylic acid)), Polymethacrylate (Polymethacrylate), Polyethylene glycol (Poly (ethylene glycol)), Polyethylene oxide (Poly (ethylene oxide)), Polyvinyl Alcohol (Poly (vinyl alcohol, PVA), polyvinylpyrrolidone (Poly (vinylpyrrolidone), characterized in that it comprises at least one selected from the group consisting of PVP).

In one embodiment, the coating solution is characterized in that it further comprises a reducing agent.

In one embodiment, the reducing agent is characterized in that it comprises at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine (hydrazine).

In one embodiment, the catalyst is characterized in that it comprises tin (Sn).

In addition, the coating method disclosed in the present invention comprises the steps of preparing a film-forming liquid containing a polymer that is decomposed or oxidized to cause odor; Forming a coating liquid by adding alcohol to the film forming liquid at a predetermined weight part; Immersing the coating-forming object in the coating liquid and then removing the coating-forming object from the coating liquid in the coating liquid to form a coating layer; And drying the coating layer at a predetermined temperature to form a film, wherein the forming of the film is characterized in that the polymer and the alcohol react.

In one embodiment, the polymer is poly-N-isopropylacrylamide (Poly (N-isopropylacrylamide), PNIPAM), polyacrylamide (Polyacrylamide, PAM), poly 2-oxazoline (Poly (2-oxazoline)) ), Polyethylenimine (PEI), Polyacrylic acid (Poly (acrylic acid)), Polymethacrylate (Polymethacrylate), Polyethylene glycol (Poly (ethylene glycol)), Polyethylene oxide (Poly (ethylene oxide)), Polyvinyl Alcohol (Poly (vinyl alcohol, PVA), polyvinylpyrrolidone (Poly (vinylpyrrolidone), characterized in that it comprises at least one selected from the group consisting of PVP).

In one embodiment, the catalyst is characterized in that it comprises tin (Sn) in the step of preparing a film forming liquid.

In one embodiment, the alcohol is added to the predetermined weight part in the step of forming the coating liquid is characterized in that 0.1 to 50 parts by weight per 100 parts by weight of the coating film.

In one embodiment, the step of forming the coating liquid is characterized in that it further comprises the step of adding a reducing agent.

In one embodiment, the reducing agent is characterized in that it comprises at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine (hydrazine).

In one embodiment, the forming of the film is characterized in that it is carried out at a temperature of 120 to 150 ℃.

According to the coating liquid according to the present invention, an odor-causing substance generated during the process of forming a film containing 0.1 to 50 parts by weight of alcohol per 100 parts by weight of the film-forming liquid containing a polymer that is decomposed or oxidized to cause an odor can be removed. It can be effective.

In addition, the coating method according to the present invention includes the step of forming a film by drying the coating layer at a predetermined temperature during the process of forming a film, and in the forming of the film, the polymer and the alcohol react to decompose or Oxidized substances that cause odors are removed to reduce odor.

1 is a flowchart showing a coating method of an embodiment of the present invention.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Protects the product by forming a film made of polymer on the surface of the heat exchanger generated by the operation of the heat exchanger, which is a core part of the air conditioner, the refrigerator and the laundry dryer, or the surface that is difficult to avoid the moisture environment, such as a washing machine that is continuously exposed to moisture. do. Furthermore, a film formed of a polymer may also be formed for the purpose of preventing contamination of the surface of the product. The film formed on the surface of the product can be adjusted and used according to the requirements of the object to be formed film. In detail, the coating film formed of the polymer may include various functional groups in the polymer and satisfy the physical properties required by the object by the various functional groups.

In the present invention, the coating liquid for forming the coating may include a film forming liquid and an alcohol containing a component necessary for forming the coating.

The film-forming liquid may include a polymer for forming a film and a catalyst for generating hydrogen ions to smoothly form the film with the polymer. The polymer included in the film-forming liquid may have various functional groups, and the polymer may decompose or oxidize to cause an odor.

In detail, a polymer containing various functional groups may be decomposed or oxidized depending on the environment to generate a substance causing odor. In detail, the polymer is decomposed or oxidized in the process of forming the film with the coating liquid containing the polymer, thereby producing a nitrogen compound including fatty acids and amines, which may cause an odor.

In particular, in the case of having a hydroxyl group (-OH), a carbonyl group (-COH), and a ketone group (R-CO-R) as a functional group of the polymer, the polymer may be decomposed to produce a low molecular material, and further, a hydroxy group or a carbonyl group is oxidized. Carboxyl group (-COOH). In addition, the ketone group may be decomposed to form a carbonyl group, and even in this case, the carbonyl group formed from the ketone group may be oxidized to form a carboxyl group. Accordingly, the polymer material may be changed into a fatty acid which is a carboxylic acid of a hydrocarbon chain having a carboxyl group, causing an odor. Specifically, valeric acid and butanoic acid, which are a type of fatty acid, cause an unpleasant odor.

On the other hand, when the carboxyl group (-COOH) is included as a functional group of the polymer, the polymer may be decomposed to produce an odorous fatty acid only by changing to a low molecular weight material.

In one embodiment, the polymers that can be decomposed or oxidized to cause odors, as described above, are polyN-isopropylacrylamide (PNIPAM), polyacrylamide (PAM), poly 2 Oxazoline (Poly (2-oxazoline)), polyethyleneimine (Polyethylenimine, PEI), polyacrylic acid (Poly (acrylic acid)), polymethacrylate, Poly (ethylene glycol), polyethylene oxide (Poly (ethylene oxide)), polyvinyl alcohol (Poly (vinyl alcohol, PVA) and polyvinylpyrrolidone (Poly (vinylpyrrolidone), PVP) at least one selected from the group consisting of. The polymers may be materials that can be well dispersed in alcohols included in the coating solution of the present invention described below as hydrophilic polymers.

In one embodiment, by the action of the catalyst contained in the film-forming liquid it is possible to form a film with a higher yield. The catalyst may be an acid catalyst that generates hydrogen ions, and may include tin oxide (SnO ₂ ) and tin chloride (SnCl ₂ ) including tin (Sn). In addition, it is also possible to use a catalyst of the AP-CAT0040 series of commercial products containing tin.

Meanwhile, alcohol may be added to the film forming solution at 0.1 to 50 parts by weight per 100 parts by weight of the film forming liquid to form the coating liquid of the present invention. The alcohol may be mixed in a range capable of sufficiently reacting with a polymer that is decomposed or oxidized to cause an odor contained in the coating liquid. In addition, the substance causing the odor caused by the polymer participating in the reaction may be in a range that can prevent the back reaction to return to the substance causing the odor.

Furthermore, the alcohol added to the film forming liquid may include at least one selected from the group consisting of lower alcohols having a low molecular weight (5 or less carbon atoms). Thus, it can be mixed well with the hydrophilic polymers described above.

In detail, the alcohol contained in the coating liquid may modify the odor of the fatty acid which is a causative agent of odor by performing esterification described in Formula 1 below with a fatty acid that causes an odor formed by oxidation or decomposition of the aforementioned polymer. Can be. The acid catalyst required for the esterification reaction may be a catalyst included in the film forming solution. Furthermore, the acid catalyst may be used to promote the reaction time and may be Lewis acid. The ester formed by the reaction between the carboxyl group of the fatty acid and the alcohol is usually odorless or fruity. Thus, the smell of fatty acids can disappear.

In one embodiment, in an acidic catalyst environment at a predetermined temperature, an unpleasant odor valeric acid and ethanol may be esterified to produce ethyl valerate with a fruity odor.

In addition, in an acidic catalyst environment at a predetermined temperature, butanoic acid and ethanol having an unpleasant odor may be esterified to produce ethyl butyrate having a fruity odor.

In addition, when alcohol is mixed at less than 0.1 part by weight per 100 parts by weight of the film forming solution to form a coating solution, the esterification reaction with alcohol is insignificant, and the odor generated from fatty acids cannot be removed. On the other hand, when the alcohol is mixed in excess of 50 parts by weight per 100 parts by weight of the film forming liquid to form a coating liquid, the proportion of the polymer in the entire coating liquid is reduced to form a uniform film on the surface of the film forming object.

In one embodiment, the coating liquid may further comprise a reducing agent. The reducing agent may include at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH _2, and hydrazine. The reducing agent may serve to reduce and remove the ester compound itself in order to prevent a reverse reaction in the ester compound formed of alcohol. In addition, the reducing agent may act directly on the fatty acid to reduce the carboxy group of the fatty acid to remove the fatty acid by aldehyde or hydroxy group.

1 is a flowchart showing a coating method of an embodiment of the present invention.

Referring to Figure 1, the coating method disclosed in the present invention comprises the steps of preparing a film forming liquid (S1), forming a coating liquid (S2), forming a coating layer (S3) and forming a film (S4) Is performed.

In preparing the film forming solution (S1), the film forming solution is accommodated in the container. The film forming liquid may include a polymer for forming a film as described above, and a catalyst for generating hydrogen ions to smoothly form the film with the polymer. In addition, the detailed description about the film forming liquid is replaced with the above-mentioned description.

Subsequently, in the step (S2) of forming a coating liquid, alcohol is added to the film forming liquid in a predetermined weight part, and the coating liquid may be formed thereon. A predetermined weight part of alcohol may be added to the film forming liquid at 0.1 to 50 parts by weight per 100 parts by weight of the film forming liquid to form a coating liquid of the present invention. The alcohol may be mixed in a range capable of sufficiently reacting with a polymer that is decomposed or oxidized to cause an odor contained in the coating liquid. In addition, the substance causing the odor caused by the polymer participating in the reaction may be in a range that can prevent the back reaction to return to the substance causing the odor.

Furthermore, the alcohol added to the film forming liquid may include at least one selected from the group consisting of lower alcohols having a low molecular weight (5 or less carbon atoms). Therefore, it can be mixed well with the hydrophilic polymers included in the film-forming liquid.

In addition, in the forming of the coating liquid (S2), stirring of the coating liquid and the alcohol may be performed to form a coating liquid that is a uniform mixture.

In addition, the step of forming the coating liquid (S2) may further comprise the step of adding a reducing agent. The reducing agent may include at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH _2, and hydrazine. Specifically, the reducing agent may be added to prevent a reverse reaction in the ester compound formed in the esterification of the alcohol and the polymer described below. In detail, the reducing agent may serve to reduce the ester compound by reducing itself. In addition, the reducing agent may act directly on the fatty acid to reduce the carboxy group of the fatty acid to remove the fatty acid by aldehyde or hydroxy group.

In the forming of the coating layer (S3), the coating forming object may be immersed in the coating liquid, and then the coating forming object may be taken out of the coating liquid in the coating liquid to form a coating layer. At this time, the film-forming object is immersed in the coating liquid is a coating liquid is attached to the film-forming object. Subsequently, the coating-forming object may be taken out of the coating liquid to adjust the amount of the coating liquid attached to the coating-forming object to form a coating layer. In addition, the amount of the coating liquid attached to the film-forming object may be controlled by removing the film-forming object from the coating liquid and then moving the film-forming object up or down or left and right.

In the forming of the film (S4), the coating layer formed on the film-forming object is dried at a predetermined temperature to form a film. At this time, the reaction of the polymer and the alcohol contained in the film-forming liquid may be performed. Speaking of the polymer included in the film-forming solution, it may be the polymer itself contained in the film-forming liquid, it may be a fatty acid that causes the odor formed by the oxidation or decomposition of the polymer contained in the film-forming liquid.

The alcohol contained in the coating liquid may modify the odor of the fatty acid, which is a causative agent of odor, by esterification with a fatty acid that causes an odor formed by oxidation or decomposition of the polymer included in the film-forming solution. The acid catalyst required for the esterification reaction may be a catalyst included in the film forming solution. Furthermore, the acid catalyst may be used to promote the reaction time and may be Lewis acid. The ester formed by the reaction between the carboxyl group of the fatty acid and the alcohol is usually odorless or fruity. Thus, the smell of air blowing in fatty acids may disappear.

Furthermore, the predetermined temperature of forming the film (S4) may be carried out at a temperature of 120 to 150 ℃. In the forming of the film, a predetermined temperature may be applied to dry the coating solution to form a film quickly. In addition, since the above-mentioned esterification reaction can be made more easily at a predetermined temperature, it is effective in removing the odor of the coating liquid.

When the predetermined temperature is less than 120 ° C. in the step of forming the film, it takes a long time to form the film, thereby reducing the economics of the process. On the other hand, when the predetermined temperature of the step of forming the film (S4) exceeds 150 ℃, the polymer contained in the film-forming liquid is denatured by the heat may deteriorate the performance of the film.

Hereinafter, an embodiment for checking the property of the transition metal oxide particles of the present invention to decompose odor causing substances will be described.

<Example>

Prepare a commercial film-forming solution. The commercial film-forming liquid may be a hydrophilic agent (Daeparacharizing, PALENE 5188 (abbreviated LN-5188)). Subsequently, 10 parts by weight of ethanol per 100 parts by weight is added to the film forming solution to form a coating solution. After immersing the coating-forming object in the coating liquid, the coating-forming object is taken out of the coating liquid in the coating liquid to form a coating layer, and the coating layer is dried at a temperature of 120 to 150 ° C. to form a coating.

At this time, the esterification reaction of the valence acid (valeric acid) produced by the decomposition or oxidation of the polymer in the commercial film forming solution and the catalyst of ethanol and the film forming solution to produce ethyl valerate with a fruity odor. Can be.

In addition, butyric acid (butanoic acid) produced by decomposing or oxidizing the polymer in the commercial coating solution may be esterified with a catalyst of ethanol and the film forming solution to produce ethyl butyrate having a fruity odor. .

It will be apparent to those skilled in the art that the invention can be embodied in other specific forms without departing from the essential features of the invention.

In addition, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (12)

In the coating liquid which forms a film,
The coating liquid,
Film forming solution; And
0.1 to 50 parts by weight of alcohol per 100 parts by weight of the film forming solution,
The film forming liquid,
Polymers that decompose or oxidize to cause odors; And
A coating solution comprising a catalyst for producing hydrogen ions. The method of claim 1,
The polymer,
PolyN-isopropylacrylamide (Poly (N-isopropylacrylamide), PNIPAM), polyacrylamide (PAM)), poly 2-oxazoline (Poly (2-oxazoline)), polyethyleneimine (PEI), Poly (acrylic acid), Polymethacrylate, Poly (ethylene glycol), Polyethylene (ethylene oxide), Polyvinyl alcohol (Poly (vinyl alcohol, PVA), Coating liquid, characterized in that it comprises at least one selected from the group consisting of polyvinylpyrrolidone (Poly (vinylpyrrolidone), PVP). The method of claim 1,
The coating solution further comprises a reducing agent. The method of claim 4, wherein
The reducing agent is a coating liquid, characterized in that it comprises at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine (hydrazine). The method of claim 1,
The catalyst is a coating liquid, characterized in that containing tin (Sn). Preparing a film forming solution comprising a polymer that is decomposed or oxidized to cause an odor;
Forming a coating liquid by adding alcohol to the film forming liquid at a predetermined weight part;
Immersing the coating-forming object in the coating liquid and then removing the coating-forming object from the coating liquid in the coating liquid to form a coating layer; And
Drying the coating layer at a predetermined temperature to form a film, wherein the forming of the film comprises coating the polymer with the alcohol. The method of claim 6,
The polymer,
PolyN-isopropylacrylamide (Poly (N-isopropylacrylamide), PNIPAM), polyacrylamide (PAM)), poly 2-oxazoline (Poly (2-oxazoline)), polyethyleneimine (PEI), Poly (acrylic acid), Polymethacrylate, Poly (ethylene glycol), Polyethylene oxide, Polyvinyl alcohol, Coating method comprising at least one selected from the group consisting of polyvinylpyrrolidone (Poly (vinylpyrrolidone), PVP). The method of claim 6,
In the step of preparing a film forming solution, the catalyst comprises a coating (Sn). The method of claim 6,
The alcohol is added to the predetermined weight part in the step of forming the coating liquid is a coating method, characterized in that 0.1 to 50 parts by weight per 100 parts by weight of the coating film. The method of claim 6,
Forming the coating solution further comprises the step of adding a reducing agent. The method of claim 10,
The reducing agent is a coating method comprising at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine (hydrazine). The method of claim 6,
Forming the film is a coating method, characterized in that carried out at a temperature of 120 to 150 ℃.

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