KR102110209B1 - Coating liquid and coating method thereof - Google Patents

Abstract

The present invention relates to a coating solution forming a film, the coating solution is a film forming solution; And 0.1 to 50 parts by weight of alcohol per 100 parts by weight of the film-forming solution. Furthermore, the film-forming solution is a polymer that is decomposed or oxidized to form fatty acids; And a catalyst that generates hydrogen ions.

Description

Coating liquid and coating method thereof

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

When electronic products such as air conditioners, refrigerators, and dryers operate, a film is formed on the surface of the heat exchanger embedded in the electronic product and the surface exposed to moisture to protect the electronic product.

Generally, the coating may include a polymer. Furthermore, the polymer can be used by adjusting the film according to the needs of the subject to which the film is formed, including various functional groups. Polymers can decompose or oxidize depending on the environment to form substances that cause odors.

In detail, nitrogen compounds containing fatty acids and amines produced by decomposition or oxidation of polymers can cause odor. Decomposition or oxidation of the polymer may occur in the process of forming a film with a coating solution containing the polymer. In particular, in the process of forming a film including a process of heating to a predetermined temperature, a substance that causes odor is likely to be formed.

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

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

In the coating liquid forming the coating of the present invention, the coating liquid, the coating liquid; And 0.1 to 50 parts by weight of alcohol per 100 parts by weight of the film-forming solution. Furthermore, the film-forming solution may be decomposed or oxidized to cause odor; And a catalyst that generates hydrogen ions.

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

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 solution containing a polymer that is decomposed or oxidized to cause odor; Forming a coating solution by adding alcohol in a predetermined weight part to the film forming solution; Immersing a film-forming object in the coating solution, and then taking a film-forming object from the coating solution from the coating solution to form a coating layer; And drying the coating layer at a predetermined temperature to form a coating film, wherein the polymer and the alcohol react in the forming of the coating film.

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

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

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

In one embodiment, the step of forming the coating solution 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.

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

According to the coating solution according to the present invention, the odor-causing substances 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 solution containing a polymer that decomposes or is oxidized to cause odor to be removed It has the effect of being able to.

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 the film, and in the step of forming the film, the polymer and the alcohol react to decompose the polymer or It has the effect of reducing the odor by removing the odor-causing substances.

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

Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, but the same or similar elements are assigned the same reference numbers regardless of the reference numerals, and overlapping descriptions thereof will be omitted. In addition, in describing the embodiments disclosed in this specification, detailed descriptions of related known technologies are omitted when it is determined that the gist of the embodiments disclosed in this specification may be obscured. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention , It should be understood to include equivalents or substitutes.

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

In this application, terms such as "comprises" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described in the specification, but one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

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

In the present invention, the coating solution for forming the film may include a film forming solution and an alcohol containing components essential for film formation.

The film-forming solution may include a polymer to form a film and a catalyst that generates hydrogen ions to smoothly form a film with the polymer. The polymer contained in the film-forming solution may have various functional groups, and the polymer may decompose or oxidize to cause odor.

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

Particularly, when the functional group of the polymer has a hydroxy group (-OH), a carbonyl group (-COH), or a ketone group (R-CO-R), the polymer is decomposed to generate a low molecular substance, and further, the hydroxy group or carbonyl group is oxidized. It can be changed to a carboxy group (-COOH). In addition, the ketone group can be decomposed to form a carbonyl group, and even in this case, the carbonyl group formed from the ketone group can be oxidized to form a carboxy group. Accordingly, the polymer material may be changed to a fatty acid, which is a carboxylic acid of a hydrocarbon chain having a carboxyl group, to cause odor. Specifically, valeric acid and butanoic acid, which are a kind of fatty acids, cause an unpleasant smell.

On the other hand, when a carboxyl group (-COOH) is included as a functional group of a polymer, the polymer decomposes and changes into a low-molecular substance, thereby generating odor-causing fatty acids.

In one embodiment, the polymer that can decompose or oxidize to cause odor as described above is polyN-isopropylacrylamide (PNIPAM), polyacrylamide (PAM), poly 2 -Oxazoline (Poly (2-oxazoline)), Polyethylenimine (PEI), Poly (acrylic acid), Polymethacrylate, Poly (ethylene glycol), Polyethylene oxide (Poly (ethylene oxide)), polyvinyl alcohol (Poly (vinyl alcohol, PVA) and polyvinylpyrrolidone (Poly (vinylpyrrolidone), PVP)) may include at least one selected from the group consisting of. The polymers may be materials that can be well dispersed in the alcohol contained in the coating solution of the present invention, which will be described later as hydrophilic polymers.

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

On the other hand, 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 solution to form the coating solution of the present invention. Alcohol may be mixed in a range capable of sufficiently reacting with a polymer that decomposes or oxidizes in the film forming solution to cause odor. In addition, it may be a range that can prevent the substance causing the odor resulting from the polymer participating in the reaction to return to the substance causing the odor again as a reverse reaction.

Furthermore, the alcohol added to the film-forming solution 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 described above.

In detail, the alcohol contained in the coating solution is capable of modifying the odor of the fatty acid, which is the causative agent of odor, by performing the esterification reaction described in Chemical Formula 1 with the fatty acid that causes odor formed by oxidation or decomposition of the above-described polymer. You can. 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 accelerate the reaction time, and may be Lewis acid. Esters formed by the reaction of fatty acid carboxy groups with alcohols are generally odorless or fruity. Thus, the smell of fatty acids may disappear.

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

Further, in an acid catalyst environment at a predetermined temperature, butyric acid and ethanol having an unpleasant odor may be esterified to produce ethyl butyrate with a fruity odor.

In addition, when the alcohol is mixed with less than 0.1 parts by weight per 100 parts by weight of the film-forming solution to form a coating solution, the esterification reaction by alcohol is insignificant and the smell 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 solution to form a coating solution, the proportion of polymer in the entire coating solution decreases, so that a uniform film cannot be formed on the surface of the film forming object.

In one embodiment, the coating solution may further include 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 to prevent an adverse reaction in the ester compound formed of alcohol. In addition, the reducing agent directly acts on the fatty acid, and the carboxyl group of the fatty acid may be reduced to an aldehyde group or a hydroxy group to remove the fatty acid.

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

Referring to Figure 1, the coating method disclosed in the present invention is a step of preparing a film forming solution (S1), forming a coating solution (S2), forming a coating layer (S3) and forming a film (S4) ).

In the step (S1) of preparing the film forming liquid, the film forming liquid is accommodated in a container. As described above, the film-forming solution may include a polymer to form a film and a catalyst that generates hydrogen ions to smoothly form a film with the polymer. In addition, the detailed description of the film forming liquid is replaced by the above-described description.

In step S2 of forming a coating solution to be performed, alcohol is added to the film forming solution in a predetermined weight part, and a coating solution may be formed thereon. The predetermined weight portion 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 the coating solution of the present invention. Alcohol may be mixed in a range capable of sufficiently reacting with a polymer that decomposes or oxidizes in the film forming solution to cause odor. In addition, it may be a range that can prevent the substance causing the odor resulting from the polymer participating in the reaction to return to the substance causing the odor again as a reverse reaction.

Furthermore, the alcohol added to the film-forming solution 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 well mixed with the hydrophilic polymers contained in the film-forming solution.

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

In addition, the step (S2) of forming a coating solution may further include a step of adding a reducing agent. Here, the reducing agent may include at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine. In detail, a reducing agent may be added to prevent an adverse reaction in the ester compound formed in the esterification reaction of an alcohol and a polymer described below. In detail, the reducing agent may serve to reduce and remove the ester compound itself. In addition, the reducing agent directly acts on the fatty acid, and the carboxyl group of the fatty acid can be reduced to an aldehyde group or a hydroxy group to remove the fatty acid.

In the step of forming the coating layer (S3), the object for forming a film is immersed in the coating solution, and then the object for forming the film is taken out of the coating solution to form a coating layer. At this time, the film-forming object is immersed in the coating solution, and the coating solution is attached to the film-forming object. Subsequently, the coating-forming object may be taken out of the coating solution to control the amount of the coating solution attached to the coating-forming object to form a coating layer. In addition, the amount of the coating solution attached to the film forming object may be adjusted by taking the film forming object out of the coating solution and then moving up and down or left and right.

In the step of forming a 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 alcohol contained in the film forming solution may be performed. Speaking of the polymer contained in the film-forming liquid, it may be the polymer itself contained in the film-forming liquid, or the polymer contained in the film-forming liquid may be a fatty acid that causes an odor formed by oxidation or decomposition.

The alcohol contained in the coating liquid may undergo an esterification reaction with a fatty acid that causes odor formed by oxidation or decomposition of the polymer contained in the film-forming liquid, thereby modifying the odor of fatty acid, which is a causative agent of odor. 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 accelerate the reaction time, and may be Lewis acid. Esters formed by the reaction of fatty acid carboxy groups with alcohols are generally odorless or fruity. Thus, the smell of fatty acids may disappear.

Furthermore, a predetermined temperature in the step (S4) of forming a film may be performed at a temperature of 120 to 150 ° C. In the step of forming the film, a predetermined temperature may be applied to dry the coating solution to quickly form a film. In addition, since the above-described esterification reaction can be more easily performed at a predetermined temperature, it is effective in removing the odor of the coating solution.

When the predetermined temperature is less than 120 ° C in the step of forming the film (S4), it takes a long time to form the film, and the economic efficiency of the process may be reduced. On the other hand, when the predetermined temperature in the step S4 of forming the film exceeds 150 ° C, the polymer contained in the film forming solution may be denatured by heat, thereby deteriorating the performance of the film.

Hereinafter, an embodiment for confirming a property that the transition metal oxide particles of the present invention decomposes an odor-causing substance will be described.

<Example>

A commercial film forming solution is prepared. The commercial film forming solution may be a hydrophilic agent (Daehan Pacarizing, PALENE 5188 (abbreviated as 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 film-forming object in the coating solution, the film-forming object is taken out of the coating solution to form a coating layer, and then the coating layer is dried at a temperature of 120 to 150 ° C. to form a film.

At this time, in the commercial film forming solution, the polymer is decomposed or oxidized and esterified with the catalyst of valeric acid and ethanol and the film forming solution to produce ethyl valerate with a fruity odor. You can.

In addition, in the commercial film-forming solution, a polymer may be decomposed or oxidized, and esterified with a catalyst of butanoic acid and ethanol and a film-forming solution to produce ethyl butyrate with a fruity odor. .

It will be apparent to those skilled in the art that the invention may 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 restrictively in all respects, but should be considered as illustrative. The scope of the invention should be determined by rational 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 to form a film,
The coating solution,
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 solution,
Polymers that decompose or oxidize to cause odor; And
Contains a catalyst that generates hydrogen ions,
The coating solution is characterized in that it further comprises a reducing agent. According to claim 1,
The polymer,
PolyN-isopropylacrylamide (PNIPAM), polyacrylamide (PAM)), poly 2- (2-oxazoline), polyethylenimine (PEI), Polyacrylic acid (Poly (acrylic acid)), polymethacrylate, poly (ethylene glycol), poly (ethylene oxide), polyvinyl alcohol (PVA), Polyvinylpyrrolidone (Poly (vinylpyrrolidone), PVP) coating solution comprising at least one selected from the group consisting of. delete According to claim 1,
The reducing agent is a coating solution comprising at least one selected from the group consisting of NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine. According to claim 1,
The catalyst is a coating liquid, characterized in that it contains tin (Sn). Preparing a film-forming solution containing a polymer and a catalyst that is decomposed or oxidized to cause odor;
Forming a coating solution by adding alcohol in a predetermined weight part to the film forming solution;
Immersing a film-forming object in the coating solution, and then taking a film-forming object from the coating solution to form a coating layer; And
And drying the coating layer at a predetermined temperature to form a film.
The forming of the coating solution further includes adding a reducing agent,
In the step of forming the coating, the coating method characterized in that the polymer and the alcohol react. The method of claim 6,
The polymer,
PolyN-isopropylacrylamide (PNIPAM), polyacrylamide (PAM)), poly 2- (2-oxazoline), polyethylenimine (PEI), Polyacrylic acid (Poly (acrylic acid)), polymethacrylate, poly (ethylene glycol), poly (ethylene oxide), polyvinyl alcohol (PVA), A coating method comprising at least one selected from the group consisting of polyvinylpyrrolidone (PV). The method of claim 6,
In the step of preparing the film-forming liquid, the catalyst comprises tin (Sn). The method of claim 6,
In the step of forming the coating solution, the alcohol added to the predetermined weight part is 0.1 to 50 parts by weight per 100 parts by weight of the film forming solution. delete The method of claim 6,
The reducing agent is NaBH ₄ , LiAlH ₄ , NaH, CaH ₂ and hydrazine (hydrazine) coating method comprising at least one selected from the group consisting of. The method of claim 6,
The method of forming the coating is characterized in that it is carried out at a temperature of 120 to 150 ℃.

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