Water-based cleaner for cleaning reaction equipment or molds and method for cleaning reaction equipment or molds using the same

Abstract

To provide reusable water-based cleaning agents that can easily remove unnecessary substances such as resins adhering to reaction devices and molds, and also to provide methods of cleaning the reaction devices or the molds that can easily remove unnecessary substances such as resins from the reaction devices and the molds.SOLUTION: Provided is a water-based cleaning agent for cleaning a reaction devices or mold, containing an aromatic alcohol, an inorganic alkaline compound, and a solubilizer. Also provided is a method of cleaning the reaction device or the mold using a water-based cleaning agent containing an aromatic alcohol, an inorganic alkaline compound, and a solubilizer, the method comprising a step (1) of applying the water-based cleaning agent to unnecessary substances adhering the reaction device or the mold to swell and peel off the unnecessary substances, and a step (2) of removing the unnecessary substances peeled off in step (1).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an aqueous detergent for cleaning a reaction apparatus or a mold, and a method for cleaning a reaction apparatus or a mold using the same. [Background technology]

[0002] Reaction equipment such as a reactor used in producing monomers or resins, and a mold used in resin molding, need to be periodically cleaned to remove gelled materials and resins that adhere to the inside of the equipment after use. Conventionally, when cleaning a reaction vessel, a person must enter the vessel and scrape off and remove unnecessary materials using a spatula or the like, which is a manual process that is cumbersome and dangerous. In addition, manual cleaning is insufficient, requires a lot of time, and is not necessarily efficient.

[0003] Therefore, a method for cleaning a metal container has been proposed, which includes a step of removing the photosensitive composition adhering to the metal container by ultrasonic cleaning using a semi-aqueous cleaning solution containing at least diethylene glycol alkyl ether, sodium xylene sulfonate, and sodium silicate (Patent Document 1). However, this method requires the combined use of not only the cleaning effect due to the chemical action of the cleaning solution, but also the cleaning effect due to the physical action of ultrasound.

[0004] Also, in order to remove deposits derived from the thermoplastic acrylic copolymer in a stainless steel reaction vessel in which the thermoplastic acrylic copolymer has been synthesized, a method has been proposed in which cleaning is performed using an aqueous cleaning solution containing specific amounts of an alkali metal hydroxide and one or more monohydric alcohols having 2 or 3 carbon atoms (Patent Document 2). However, this method removes the deposits derived from the thermoplastic acrylic copolymer by dissolving them, and therefore requires a long time to dissolve the deposits. As a result, there are problems in that cleaning is time-consuming, waste liquid generated by cleaning must be treated, and the used cleaning aqueous solution is difficult to reuse. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-159180 A [Patent Document 2] JP 2012-5952 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide an aqueous cleaning agent which can easily remove unwanted materials such as resin adhering to reaction equipment and molds and which can be reused. Another object of the present invention is to provide a method for cleaning a reaction vessel or a mold, which can easily remove unwanted materials such as resin from the reaction vessel or the mold. [Means for solving the problem]

[0007] The present invention relates to a method for cleaning a reaction vessel or a mold, comprising the steps of: and removes acrylic resin, urethane resin, epoxy resin, or silicone resin adhering to reaction equipment or molds. Water-based cleaning agent for And, The pH of the water-based cleaner is 13 or higher. The solubilizing agent is at least one selected from the group consisting of toluenesulfonate, xylenesulfonate, ethylene glycol, propylene glycol, diethylene glycol, and triethylene glycol, and the content of the solubilizing agent is 12 mass% or more. It is.

[0008] The aromatic alcohol is preferably benzyl alcohol. The inorganic alkaline compound is preferably sodium hydroxide and / or potassium hydroxide.

[0010] The present invention also relates to a composition comprising an aromatic alcohol, an inorganic alkaline compound and a solubilizing agent. At least one selected from the group consisting of toluenesulfonate, xylenesulfonate, ethylene glycol, propylene glycol, diethylene glycol, and triethylene glycol of 12% by mass or more Contains pH is 13 or higher Cleaning reaction equipment or molds using water-based cleaners and removes acrylic resin, urethane resin, epoxy resin, or silicone resin adhering to reaction equipment or molds. 1. A method for producing a pharmaceutical composition comprising the steps of: Adhered to reaction equipment or mold The above resin The aqueous cleaning agent is applied to the The above resin (1) a step of swelling and peeling the Peeled off in step (1) The above resin Step (2) of removing The present invention also relates to a method for cleaning a reaction apparatus or a mold, comprising the steps of: Effect of the Invention

[0011] The aqueous detergent for cleaning reaction equipment or dies of the present invention can easily remove unnecessary materials such as resin from reaction equipment or dies. Furthermore, the aqueous detergent after use can be reused by subjecting it to a treatment such as filtration. Furthermore, by the method for cleaning a reaction vessel or a mold of the present invention, unnecessary materials such as resin can be easily removed from the reaction vessel or the mold. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in detail below. The aqueous cleaner of the present invention is intended for cleaning reaction equipment or molds, and contains an aromatic alcohol, an inorganic alkaline compound, and a solubilizing agent.

[0013] In the present invention, the aqueous cleaning agent is a combination of an aromatic alcohol, an inorganic alkaline compound, and a solubilizing agent, and this makes it possible to swell and peel off unwanted materials such as resins adhering to reaction equipment or molds from the surfaces of the reaction equipment, etc., in a relatively short time. The aqueous cleaning agent of the present invention is a cleaning agent in which various components are uniformly solubilized, and therefore the cleaning agent has good permeability into unnecessary materials, which quickly swell and can be smoothly peeled off from reaction equipment, etc.

[0014] In this way, the aqueous cleaning agent of the present invention can easily remove unwanted substances that are difficult to dissolve and clean using conventional aqueous or solvent-based cleaning agents by swelling and peeling them off.

[0015] The aromatic alcohol used in the present invention includes benzyl alcohol, phenethyl alcohol, hydroxybenzyl alcohol, hydroxyphenethyl alcohol, and the like. In particular, benzyl alcohol is preferred in terms of its low toxicity, solubility in water, and ease of availability.

[0016] In the present invention, it is preferable to use an aromatic alcohol having a boiling point of 100° C. or higher at 1 atmosphere (atm). More preferably, it is 200° C. or higher. A high boiling point makes it possible to make the aqueous cleaning agent non-flammable, which is favorable in terms of safety.

[0017] The inorganic alkaline compound used in the present invention includes sodium hydroxide, potassium hydroxide, sodium phosphate, potassium phosphate, sodium silicate, potassium silicate, etc., and at least one selected from these is used. Among these, sodium hydroxide and potassium hydroxide are preferred from the viewpoint of strong alkalinity.

[0018] The solubilizer used in the present invention is a component that can uniformly mix aromatic alcohols, etc., and examples of such components include aromatic sulfonates, glycol solvents, and alkanolamines. By using a solubilizer, each component can be uniformly mixed with water. By making the aqueous cleaning agent in which each component is uniformly mixed, it acts effectively on unwanted substances. Among these, at least one selected from the group consisting of toluenesulfonate, xylenesulfonate and glycol solvents is preferred.

[0019] The toluenesulfonate and xylenesulfonate may be sodium, potassium, lithium or calcium salts, with sodium salts being preferred, and sodium paratoluenesulfonate being particularly preferred from the standpoint of safety.

[0020] Examples of the glycol solvent include ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, etc. Among these, propylene glycol is preferred in terms of solubilizing ability. Furthermore, glycol alkyl ethers such as diethylene glycol alkyl ethers may also be used.

[0021] In the present invention, the aromatic alcohol is preferably contained in the aqueous cleaner in an amount of 20 to 90% by mass. The lower limit of the content is more preferably 30% by mass, further preferably 35% by mass, and most preferably 40% by mass. On the other hand, the upper limit of the content is more preferably 60% by mass, and further preferably 50% by mass. If the amount of aromatic alcohol is too small, the cleaning properties tend to decrease, whereas if the amount is too large, precipitation of salts tends to occur.

[0022] The inorganic alkaline compound is preferably contained in the aqueous cleaner in an amount of 1 to 10% by mass, more preferably 1 to 5% by mass, and further preferably 1 to 2% by mass. If the inorganic alkaline compound is too small, the cleaning properties may decrease. Conversely, if it exceeds 5 mass %, it is designated as a deleterious substance, which may make handling difficult.

[0023] The solubilizer is preferably contained in the aqueous cleaning agent in an amount of 5 to 30% by mass. The lower limit of the content is more preferably 12% by mass, and even more preferably 15% by mass. On the other hand, the upper limit of the content is more preferably 25% by mass. If the amount of solubilizing agent is too small, the aromatic alcohol tends not to be solubilized, whereas if the amount is too large, precipitation of salts tends to occur.

[0024] The aqueous cleaner of the present invention containing the above-mentioned components is excellent in cleaning effect against unwanted substances. The aqueous detergent of the present invention may be prepared by mixing the above-mentioned raw materials with water by a conventional method, such as stirring.

[0025] The pH of the aqueous cleaner of the present invention is preferably at least 13.0. If the pH is less than 13.0, the cleaning properties will decrease.

[0026] Furthermore, the aqueous cleaning agent of the present invention preferably contains a chelating agent, which is advantageous in terms of removing inorganic scale.

[0027] The chelating agent is preferably an aminocarboxylic acid-based chelating agent, and specific examples thereof include nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), hydroxyethylenediaminetriacetic acid (HEDTA), ethylenediamine-N,N-disuccinic acid (EDDS), etc. Among them, NTA is preferred in terms of chelating power.

[0028] The chelating agents may be used alone or in combination of two or more. The content of the chelating agent in the aqueous cleaner is preferably 0.1 to 1.0% by mass.

[0029] The aqueous detergent of the present invention may further contain one or more surfactants selected from nonionic surfactants, anionic surfactants and amphoteric surfactants.

[0030] The reaction equipment to be washed in the present invention includes equipment members such as reaction vessels made of metal, baffle plates, stirring blades, conduits, connecting jigs, etc. Furthermore, examples of the mold include metal molds used for molding resins and the like.

[0031] In the present invention, the unwanted materials such as resins to be cleaned are not particularly limited, and examples thereof include gelled materials generated during the production of monomers such as acrylic acid, isocyanate-based compounds, and epoxy-based compounds, residual resins such as acrylic resins, urethane-based resins, epoxy-based resins, and silicone resins, gelled materials derived from these resins, and silica.

[0032] Examples of substances that adhere to the inside of a reaction vessel include residual resins such as acrylic resins, urethane resins, and epoxy resins, gels derived from these resins, gels generated during the production of monomers such as acrylic acid, isocyanate compounds, and epoxy compounds, and silica. Examples of substances that adhere to or accumulate on equipment components include dirt derived from epoxy resins, dirt derived from isocyanate compounds, and dirt derived from silicone resins. Examples of substances that adhere to a mold include silicone resins and various rubbers.

[0033] In the present invention, it is possible to satisfactorily clean gelled substances such as carboxylic acids (or their origin) which have been difficult to remove using conventional aqueous or solvent-based cleaners.

[0034] The present invention is particularly effective for cleaning acrylic resins, urethane resins, and the like.

[0035] The method for cleaning a reaction tool or a mold of the present invention comprises the steps of: A step (1) of applying the aqueous cleaner to unwanted matter adhering to a reaction tool or a mold to cause the unwanted matter to swell and peel off; Step (2) of removing the unnecessary material peeled off in step (1) It has the following.

[0036] Specifically, in step (1), in the case of a reaction vessel, for example, an aqueous cleaning agent is placed in the vessel so that the unnecessary objects are sufficiently immersed in the aqueous cleaning agent, or in the case of equipment components, dies, etc., for example, they are immersed in a cleaning liquid.

[0037] In the cleaning, the water content of the aqueous cleaner is preferably 10 to 80% by mass, and more preferably 20 to 40% by mass.

[0038] In this case, the temperature of the aqueous cleaner during cleaning is preferably 60 to 100° C., and more preferably 70 to 90° C. However, depending on the state of adhesion of unwanted matter, room temperature may also be used.

[0039] The immersion time may be appropriately set depending on the type of unwanted matter and the degree of adhesion, and is preferably about 1 minute to 2 hours, and more preferably 30 minutes to 1 hour. During immersion, if a reaction vessel is used, it is preferable to generate a water current by rotating a propeller or the like to stir the inside of the vessel. This allows for faster cleaning.

[0040] As described above, by immersing the unwanted materials in the aqueous detergent of the present invention, the aqueous detergent penetrates the unwanted materials, causing the unwanted materials to gradually swell and peel off from the reaction equipment or mold.

[0041] Next, in step (2), the aqueous cleaner and the removed unnecessary materials are washed away with water or the like, and removed. Furthermore, unnecessary materials that have not been completely removed may be removed by using a water flow.

[0042] In the case of a reaction vessel, it is preferable to wash the inside of the vessel with water using a high-pressure washer. Furthermore, it is preferable to wash off the surface with an organic solvent such as alcohol or acetone, since this makes it possible to more reliably remove the aqueous cleaner.

[0043] After removing the unnecessary materials, the reaction apparatus and the mold may be dried, if necessary, by blowing air or using a dryer.

[0044] The cleaning method of the present invention makes it possible to easily remove unwanted materials such as resins, and therefore eliminates the need for dangerous work such as entering the reactor to clean it or scraping it off with a spatula or the like. Furthermore, cleaning can be performed by a simple procedure of immersing the unwanted materials in a water-based cleaning agent and then removing them by rinsing them with water, etc., which can shorten the time required for the cleaning process.

[0045] In addition, when the unwanted matter is not firmly attached, it may be washed by pouring an aqueous cleaner at room temperature over the unwanted matter.

[0046] It is also preferable to carry out pre-cleaning with water, an organic solvent or the like prior to the cleaning method of the present invention. This allows the aqueous cleaning agent to be reused more frequently.

[0047] It is preferable to use a filter or the like to filter out the solids from the cleaning liquid used after cleaning the reaction vessel or the mold, and recover the liquid. The recovered liquid can be reused as an aqueous cleaner by removing excess water or organic solvent by distillation or the like, or by adjusting the content of each component, as necessary. EXAMPLES

[0048] The present invention will be specifically described below based on examples. Note that the present invention is not limited to the following examples. In the examples, "parts" and "%" refer to "parts by mass" and "% by mass" unless otherwise specified.

[0049] Example 1 A stripping cleaner was prepared by mixing 50% benzyl alcohol, 15% sodium paratoluenesulfonate, 2% sodium hydroxide, and 33% water. The solubilization state of the resulting stripping cleaner was evaluated according to the following criteria. The resulting stripping cleaner was also used to perform a urethane resin stripping test according to the following method.

[0050] <Solubilization criteria> The solubilization state of the prepared stripping cleaner was evaluated. 〇: Transparent uniform ×: Separation or solid precipitation

[0051] (Test Method) (1) 0.5 g of urethane resin was applied to a 30 x 50 mm stainless steel plate (JIS G 4305 SUS 304) and baked at 80°C for 3 hours to prepare a test specimen. (2) After heating 120 g of the stripping cleaner to 80°C, the test piece (1) was immersed in it and the state of peeling was confirmed. (3) Judgment was based on the following criteria.

[0052] <Criteria for peeling> ◎: 100% peeling within 15 minutes ○: 100% peeling within 30 minutes △: 100% peeled off within 45 minutes ×: No peeling even after 1 hour

[0053] (Examples 2 to 5) The compositions of the stripping cleaners were as shown in Table 1, but the same procedures as in Example 1 were followed to carry out the various evaluations.

[0054] (Comparative Examples 1 to 5) Except for the composition of the stripping cleaner shown in Table 2, each evaluation was carried out in the same manner as in Example 1. The SC Wash 1313 (manufactured by Kyoeisha Chemical Co., Ltd.) used in Comparative Example 1 is a manufacturing equipment cleaner mainly composed of a surfactant.

[0055] [Table 1]

[0056] [Table 2]

[0057] From the results in Tables 1 and 2, the stripping cleaners of the Examples were satisfactory in terms of solubilization state and stripping performance, whereas the stripping cleaners of the Comparative Examples did not strip the urethane resin and provided insufficient cleaning. [Industrial Applicability]

[0058] The present invention can efficiently remove unnecessary materials from reaction equipment and molds, and is suitable for cleaning reaction equipment and molds.

Claims

1. A water-based cleaner for cleaning a reaction vessel or a mold and removing an acrylic resin, a urethane resin, an epoxy resin, or a silicone resin adhering to the reaction vessel or the mold, the water-based cleaner comprising an aromatic alcohol, an inorganic alkaline compound, and a solubilizing agent, The pH of the aqueous cleaner is 13 or more. The solubilizing agent is at least one selected from the group consisting of toluenesulfonate, xylenesulfonate, ethylene glycol, propylene glycol, diethylene glycol, and triethylene glycol, and the content of the solubilizing agent is 12 mass% or more in the aqueous cleaning agent.

2. 2. The aqueous cleaning agent according to claim 1, wherein the aromatic alcohol is benzyl alcohol.

3. 3. The aqueous cleaner according to claim 1, wherein the inorganic alkaline compound is sodium hydroxide and / or potassium hydroxide.

4. A method for removing an acrylic resin, a urethane resin, an epoxy resin, or a silicone resin adhering to a reaction apparatus or a mold, by cleaning the reaction apparatus or the mold with an aqueous cleaner having a pH of 13 or more, the aqueous cleaner containing an aromatic alcohol, an inorganic alkaline compound, and at least one solubilizing agent selected from the group consisting of toluenesulfonate, xylenesulfonate, ethylene glycol, propylene glycol, diethylene glycol, and triethylene glycol in an amount of 12 mass% or more, the aqueous cleaner comprising the steps of: A step (1) of applying the aqueous cleaner to the resin adhering to a reaction tool or a mold to swell and peel off the resin; Step (2) of removing the resin peeled off in step (1). A method for cleaning a reaction apparatus or a mold, comprising the steps of:

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