Aerosol products of removable coating agents

Abstract

We provide a highly safe, peelable coating agent aerosol product that can produce a uniform thick film and can be applied to uneven surfaces. [Solution] An aerosol product of a peelable coating agent, comprising at least a stock solution containing a synthetic resin and a solvent, and a propellant for aerosolization, wherein the synthetic resin is one or more selected from urethane-based, acrylic-based, and carboxyvinyl-based resins, and the solvent contains alcohols, and an indicator of miscibility between the stock solution and the propellant is Compatibility = (Mass of propellant / Mass of undiluted solution) ... (Equation 1) It is defined as such, and is characterized in that this compatibility is greater than 0 and less than 3.3.

Description

Technical Field

[0001] The present invention relates to an aerosol product of a peelable coating agent.

Background Art

[0002] Conventionally, coating agents for forming protective films on the surfaces of various materials have been used. As one of the coating methods of coating agents, there is an aerosol product that can be applied in a spray form, and by adopting the spray form, a surface protective film can be made into a uniform film without unevenness. Further, it is desirable that such a surface protective film has peelability so that it can be easily peeled off as needed.

[0003] As those having peelability, thinner-type coating agents containing organic solvents such as toluene are known. However, since thinner-type coating agents erode plastic materials, they cannot be used for forming surface protective films of various plastics.

[0004] For example, Patent Document 1 discloses a peelable film-forming aerosol product comprising a resin component [A] in which 50% or more of the composition constituting the film is made of polyvinyl butyral resin, a solvent component [B], the solvent component [B] containing an acid amide-based solvent [e], and 70% or more of ([B] - [e]) being an alcohol-based solvent.

[0005] Further, Patent Document 2 discloses an aerosol composition for forming a peelable film, which contains polyvinyl butyral, a plasticizer, an alcohol, and a liquefied gas.

[0006] Patent Documents 1 and Patent Document 2 use alcohol as a solvent and can be used for forming a surface protective film of a plastic material. On the other hand, Patent Documents 1 and Patent Document 2 use polyvinyl butyral as a resin component.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Japanese Patent Publication No. 59-47268 [Patent Document 2] Japanese Patent Publication No. 2020-200404 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] This invention has been made in view of the above-mentioned conventional circumstances, and aims to provide a highly safe, peelable coating agent aerosol product that can produce a uniform thick film and can be applied to uneven surfaces. [Means for solving the problem]

[0009] The inventors of this invention diligently studied methods to achieve the above objectives and discovered that appropriate compatibility between various propellants and the synthetic resin forming the protective coating is necessary, leading to the completion of the present invention.

[0010] In other words, one aspect of the present invention is an aerosol product of a peelable coating agent, comprising at least a stock solution containing a synthetic resin and a solvent, and a propellant for aerosolization, wherein the synthetic resin is one or more selected from urethane-based, acrylic-based, and carboxyvinyl-based resins, and the solvent contains alcohols, and an indicator of miscibility between the stock solution and the propellant is Compatibility = (Mass of propellant / Mass of undiluted solution) ... (Equation 1) When defined in this way, the degree of compatibility is characterized by being greater than 0 and less than 3.3.

[0011] In one aspect of the present invention, the synthetic resin may be a one-component polyurethane resin.

[0012] Furthermore, in one aspect of the present invention, the solvent may be mainly composed of alcohols having 2 to 6 carbon atoms.

[0013] Furthermore, in one aspect of the present invention, the solvent may contain alcohols at a content of 70 wt% or more and glycol ethers at a content of 30 wt% or less.

[0014] Furthermore, in one embodiment of the present invention, the auxiliary agent may contain one or more components selected from plasticizers, surfactants, colorants, rust inhibitors, and ultraviolet absorbers.

[0015] Furthermore, in one aspect of the present invention, the propellant may be one or more selected from DME (dimethyl ether), hydrocarbon propellants, nitrogen-based gases, carbon dioxide, and fluorine-based gases. [Effects of the Invention]

[0016] According to the present invention, a uniform thick film can be obtained, and a highly safe, peelable coating agent aerosol product can be applied to uneven surfaces. [Modes for carrying out the invention]

[0017] Preferred embodiments of the present invention will be described in detail below. It should be noted that the embodiments described below are not intended to unduly limit the scope of the present invention as described in the claims, and not all of the configurations described in these embodiments are necessarily essential as solutions to the present invention.

[0018] One aspect of the present invention is an aerosol product of a peelable coating agent, comprising at least a stock solution containing a synthetic resin and a solvent, and a propellant for aerosolization, wherein the synthetic resin is one or more selected from urethane-based, acrylic-based, and carboxyvinyl-based resins, and the solvent contains alcohols, and an indicator of miscibility between the stock solution and the propellant is Compatibility = (Mass of propellant / Mass of undiluted solution) ... (Equation 1) It is defined as such, and is characterized in that this compatibility is greater than 0 and less than 3.3.

[0019] In the present invention, compatibility is an index representing the miscibility between the content composition (stock solution) of the peelable coating agent and the propellant. In the present invention, Compatibility degree = (mass of propellant / mass of stock solution) ··· (Equation 1) is defined, and it is defined by the ratio of each mass. By doing so, a quantitative evaluation of the miscibility between the stock solution and the propellant becomes possible.

[0020] The synthetic resin is one or more selected from urethane-based, acrylic-based, and carboxyvinyl-based. Alternatively, it may be an oligomer form, a modified form, a derivative thereof, a copolymer and a composite using one or more of these, and a hybrid with an inorganic substance or a ring-opening and ring-closing reaction product. As the synthetic resin, one that is soluble or dispersed in alcohol as a solvent and forms a film when the solvent volatilizes is used. As a preferable example of the synthetic resin, a one-component polyurethane resin can be mentioned. The urethane solid content concentration is preferably 1% to 50%, more preferably 1 to 20%. The one-component polyurethane resin, for example, compared with the polyvinyl butyral described in the above Patent Document 2, is less likely to leave bubbles under the same solid content concentration conditions, and the urethane has a lower viscosity and better flexibility. Further, in the present invention, it is not necessary to use a hydrofluoroolefin solvent and a propellant with respect to bubbles.

[0021] In the present invention, in order to also apply it to the coating of plastic materials, a solvent containing alcohols is used. The solvent is a formulation of alcohols that is not damaged even when applied to various plastic surfaces for the purpose, and it is preferable to use alcohols having 2 to 6 carbon atoms. Further, in addition to alcohols, glycol ethers may be added for the purpose of improving solubility and slightly increasing the boiling point.

[0022] When adding glycol ethers to alcohols as a solvent, it is preferable to adjust the alcohol content to be 70 wt% or more and the glycol ether content to be 30 wt% or less. When the glycol ether content is 40 wt% or more, it becomes difficult to weld and peel off on the surfaces of various plastics.

[0023] In one aspect of the present invention, as an auxiliary agent, one or more components selected from a plasticizer, a surfactant, a colorant, a rust inhibitor, an ultraviolet absorber, and a matting agent may be contained. The plasticizer is used for purposes such as adjusting the drying speed and viscosity. The surfactant enhances the peeling effect. For the colorant, dyes and organic and inorganic pigments can be used. The rust inhibitor can obtain an anti-rust effect on the metal surface. The ultraviolet absorber can obtain an ultraviolet absorption suppression effect. The matting agent, also called a dulling agent, can reduce the reflection of lighting, sunlight, etc. on the surface of the coating.

[0024] In the present invention, one or more selected from DME (dimethyl ether), hydrocarbon-based aerosol agents, nitrogen-based gases, carbon dioxide gas, and fluorine-based gases are added to the stock solution containing the above-mentioned synthetic resin and solvent as an aerosol agent to obtain an aerosol product. At this time, as an index representing the miscibility between the content composition (stock solution) and the aerosol agent, the compatibility is defined as Compatibility = (mass of aerosol agent / mass of stock solution) ··· (Equation 1) and adjusted so that the value of the compatibility exceeds 0 and is less than 3.3. By adjusting to this range, an aerosol product of a highly safe peelable coating agent that can be applied to transparent and uneven areas can be obtained. The mass can be measured, for example, using an electronic balance.

[0025] The aerosol product of the peelable coating agent according to the present invention can be used for a variety of applications. For example, it can be applied to surface protection of various plastics, rust prevention or suppression on metal surfaces, coloring of glass surfaces, protection of leather products, and ultraviolet absorption.

[0026] Furthermore, the aerosol product of the peelable coating agent according to the present invention includes not only a colorless and transparent coating agent, but also a colored coating agent, a coating agent with reduced transparency due to the use of a matting agent, a coating agent containing a solid dispersion, and various other embodiments.

[0027] As described above, the present invention makes it possible to obtain a uniform thick film and realize a highly safe, peelable coating agent aerosol product that can be applied to uneven surfaces. [Examples]

[0028] The present invention will be described in more detail below with reference to examples, but the present invention is not limited in any way to the following examples. The qualitative evaluations in Examples 1-1 to 1-4 described later were performed by the following methods.

[0029] ◇Evaluation Method: Evaluation was performed by visual inspection at 25°C. The following qualitative evaluation symbols were used for the evaluation. ◎: Colorless and transparent ○: Bluish-white transparent to bluish-white semi-transparent. Or milky white semi-transparent. When viewed through the liquid, distant objects (the ball on the opposite side of the container relative to the line of sight) are visible. △: White and opaque. No sedimentation or separation of liquid after standing for more than 5 minutes. The liquid does not allow for visibility of distant objects (the ball on the opposite side of the container relative to the line of sight). Redispersible. ×: Precipitation or separation of the liquid occurs within 5 minutes of standing. Alternatively, significant thickening or gelation is observed. Insoluble matter is present. ◇Evaluation method for emulsions ○: No separation or precipitate was observed in the liquid even after standing for more than 6 hours; the dispersion state was maintained. Visibility is also poor. △: No sedimentation or liquid separation after 5 minutes or more. Visibility is poor even at close range. ×: Precipitation or separation of the liquid is observed within 5 minutes. Alternatively, significant thickening or gelation is observed. *However, considering stability over time, products marked with △ may not be suitable for commercialization. Full injection was possible. *Transparent: Refers to the fact that the outline of a sphere on the opposite side of the container can be clearly observed. Semi-transparent: Refers to the fact that the outline of a sphere on the opposite side of the container cannot be clearly observed. *The term "ball" refers to a steel ball. *Container: Pressure bottle

[0030] (Example 1-1) In Example 1-1, the state of the mixture was visually inspected when the ratio of propellant mass (g) to stock solution mass (g) was varied. A one-component urethane resin was used as the resin, ethanol as the solvent, and DME as the propellant. A stock solution was prepared from a composition of 20 wt% urethane, 79 wt% alcohol, and 1 wt% surfactant. 10.00 g (12.09 ml) of this composition (d=0.8273) was placed in a pressure-resistant bottle. DME was added to the bottle little by little (so that the ratio of propellant mass (g) to stock solution mass (g) increased by approximately 0.01 each time), and the mixture was shaken well. The appearance of the mixture was then checked after adjusting the temperature of the contents to 25°C. The results are shown in Table 1.

[0031] [Table 1]

[0032] From the results in Table 1, it was found that the compatibility in Example 1-1 was favorable in the range of 0.01 to 2.54.

[0033] (Examples 1-2) In Examples 1-2, LPG 0.20 (butane) was used as the propellant. A stock solution was prepared from a composition of 20 wt% urethane, 79 wt% alcohol, and 1 wt% surfactant. 20.00 g (24.18 ml) of this composition (d=0.8273) was placed in a pressure-resistant bottle. LPG 0.20 (butane) was added to the bottle little by little (so that the ratio of propellant mass g / stock solution mass g increased by approximately 0.01 each time), and the mixture was shaken well. The appearance of the contents was then checked after adjusting the temperature to 25°C. The results are shown in Table 2.

[0034] [Table 2]

[0035] From the results in Table 2, it was found that the compatibility in Examples 1-2 was favorable in the range of 0.01 to 0.87.

[0036] (Examples 1-3) In Examples 1-3, a composition of 5 wt% urethane, 94 wt% alcohol, and 1 wt% surfactant was used as the stock solution. 10.00 g (12.49 ml) of this composition (d=0.8007) was placed in a pressure-resistant bottle. DME was added to this pressure-resistant bottle little by little (so that the ratio of propellant mass g / stock solution mass g increased by approximately 0.01 each time), and the mixture was shaken well. The appearance of the contents was then checked after adjusting the temperature to 25°C. The results are shown in Table 3.

[0037] [Table 3]

[0038] From the results in Table 3, it was found that the compatibility in Examples 1-3 was favorable in the range of 0.01 to 3.29.

[0039] (Examples 1-4) In Examples 1-4, a composition of 5 wt% urethane, 94 wt% alcohol, and 1 wt% surfactant was used as the stock solution. 10.00 g (12.49 ml) of this composition (d=0.8007) was placed in a pressure-resistant bottle. LPG 0.20 (butane) was added to the pressure-resistant bottle little by little (so that the ratio of propellant mass g / stock solution mass g increased by approximately 0.01 each time), and the mixture was shaken well. The appearance of the contents was then checked after adjusting the temperature to 25°C. The results are shown in Table 4.

[0040] [Table 4]

[0041] From the results in Table 4, it was found that the compatibility in Examples 1-4 was favorable in the range of 0.01 to 1.14.

[0042] (Example 2) In Example 2, the amount of glycol ethers added and the release properties were investigated when the amount of solvent was kept constant (solid content concentration 20%). Three types of resins were used: urethane, acrylic, and carboxyvinyl. The mixing ratios of alcohols and glycol ethers were 100 / 0% by mass, 90 / 10% by mass, 80 / 20% by mass, 70 / 30% by mass, 60 / 40% by mass, and 50 / 50% by mass. The amount of surfactant used was 0.5 to 5.0%. It is also preferable to use surfactants at 0.05 to 10.0%.

[0043] In Example 2, peelability refers to the ease with which the dried coating can be peeled off from one end using a hand or a tool with a sharp tip. ○: Good peeling △: Somewhat difficult to remove ×: Difficult to peel off The results are shown in Table 5.

[0044] [Table 5]

[0045] As the proportion of glycol ethers increases, the material is more likely to corrode plastics. Furthermore, the resulting coating tends to have a greater plasticizing effect, making it more difficult to remove. The above results were obtained because adhesion varies depending on the type of resin. Therefore, it was found that a content of 70 wt% or more of alcohols and 30 wt% or less of glycol ethers is preferable.

[0046] As described above, each embodiment and example of the present invention has been explained in detail, but it will be readily apparent to those skilled in the art that many modifications are possible without substantially departing from the novel aspects and effects of the present invention. Therefore, all such modifications are included within the scope of the present invention.

[0047] For example, any term that appears at least once in the specification or drawings alongside a broader or synonymous term may be replaced with that different term anywhere in the specification or drawings. Furthermore, the composition of the aerosol product of the peelable coating agent is not limited to those described in each embodiment and example of the present invention, and various modifications are possible.

Claims

1. Aerosol product of a removable coating agent, At a minimum, a stock solution containing a synthetic resin and a solvent, Propellant for aerosolization It has, The aforementioned synthetic resin is one or more selected from urethane-based, acrylic-based, and carboxyvinyl-based resins. The solvent includes alcohols, As an indicator showing the miscibility between the stock solution and the propellant Compatibility = (Mass of propellant / Mass of undiluted solution) ... (Equation 1) As defined, the aerosol product of a peelable coating agent is characterized in that the degree of compatibility is greater than 0 and less than 3.

3.

2. The aerosol product of the peelable coating agent according to claim 1, characterized in that the synthetic resin is a one-component polyurethane resin.

3. The aerosol product of the peelable coating agent according to claim 2, characterized in that the solvent is mainly composed of alcohols having 2 to 6 carbon atoms.

4. The aerosol product of the peelable coating agent according to claim 3, characterized in that the solvent contains 70 wt% or more of the alcohols and 30 wt% or less of the glycol ethers.

5. An aerosol product of a peelable coating agent according to any one of claims 1 to 4, characterized in that it contains one or more components selected from plasticizers, surfactants, colorants, rust inhibitors, ultraviolet absorbers, and matting agents as auxiliary agents.

6. The aerosol product of a peelable coating agent according to any one of claims 1 to 4, characterized in that the propellant is one or more selected from DME (dimethyl ether), hydrocarbon propellants, nitrogen gases, carbon dioxide, and fluorine gases.

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