JP2020083907A - Detergent - Google Patents

Abstract

To provide a detergent having excellent detergency of a sealing material for buildings.SOLUTION: A detergent contains (a) a water-soluble component that is a good solvent for a sealing material for buildings, and (b) a water-soluble component having decomposition reactivity with the sealing material for buildings.SELECTED DRAWING: None

Description

The present invention relates to a cleaning agent, particularly a cleaning agent for building sealing materials.

In order to clean and remove organic stains such as oils and fats and sealing materials for construction, especially organic stains adhering to metal surfaces, a solvent-based detergent containing an organic solvent having solubility of organic substances and a surfactant are included. Aqueous cleaning agents have been used. However, since the solvent-based cleaning agent has inherent defects such as flammability and toxicity, there are various restrictions on its use.

For example, solvent-based cleaning agents are mainly used for cleaning kitchen stains in general households and restaurants, which are mainly edible oils and fats, because it is difficult to use them due to food hygiene and fire risk. However, water-based detergents tend to have inferior detergency for oils and fats compared to solvent-based detergents, and increasing the amount of surfactant to improve detergency requires a large amount of water for rinsing, reducing non-residual properties. There is a problem of doing.

In addition, a degreasing/cleaning process is generally used on a production site for metal parts stains after processing, which is mainly industrial fats and oils. Therefore, the cleaning agent is required to be explosion-proof (non-combustible), and among solvent-based cleaning agents, those using a halogen-based solvent are used. However, there is a problem that the halogen-based solvent is not preferable from the viewpoint of environmental pollution such as ozone layer destruction.

Furthermore, at the construction site, when the color of the sealing material is changed or when the coating operation is completed, the metal jigs such as the sealing material agitator and the cylinder gun are washed. The cleaning agent used at this time is required to be non-residual in order not to remain in the jig and affect the next material, and it is a solvent system that uses a highly volatile hydrocarbon solvent such as toluene or xylene. A cleaning agent is used. However, there is a problem that hydrocarbon solvents with high volatility may affect health of workers and residents around the construction site.

On the other hand, Patent Document 1 discloses a household cleaning agent using a terpene, a surfactant, and water as a semi-aqueous cleaning agent that compensates for the drawbacks of solvent-based cleaning agents and water-based cleaning agents.

JP, 2005-75926, A

However, Patent Document 1 does not describe any cleaning property of the building sealing material, and there is a problem that non-residuality is poor because a large amount of water is required for rinsing.

Therefore, an object of the present invention is to provide a cleaning agent which is excellent in the cleaning property of the building sealing material, preferably non-residual and safe.

That is, the cleaning agent of the present invention contains (a) a water-soluble component that is a good solvent for the building sealing material, and (b) a water-soluble component that has a decomposition reactivity with the building sealing material. Is characterized by.

The cleaning agent of the present invention is excellent in cleaning and removing properties of a building sealing material, particularly a building sealing material attached to a metal surface.

Hereinafter, embodiments of the present invention will be described in detail.

The cleaning agent of the present invention comprises (a) a water-soluble component that is a good solvent for a building sealing material, (b) a water-soluble component that has a decomposition reactivity with the building sealing material, and preferably (c) ) Contains water.

<(a) Water-soluble component that is a good solvent for the building sealing material>
The component (a) is a water-soluble component that is a good solvent for the building sealing material. Here, the water-soluble component is a component that forms a complete mixture with water only by ordinary stirring without using a means such as a surfactant or a homogenizer, and does not reseparate even when left standing. preferable.

The component (a) is preferably a component which dissolves the building sealing material almost completely at room temperature, and more preferably a component which completely dissolves the building sealing material at room temperature. Specific examples include alcohols having 2 or more carbon atoms such as ethyl alcohol and isopropyl alcohol, and methyl lactate such as methyl lactate, ethyl lactate, propyl lactate, butyl lactate, pentyl lactate, hexyl lactate, and ethylhexyl lactate. Among these, lactic acid esters having an alkyl group having 5 or less carbon atoms such as ethyl alcohol, isopropyl alcohol, methyl lactate, ethyl lactate, propyl lactate, butyl lactate and pentyl lactate are preferable, and ethyl alcohol, isopropyl alcohol, methyl lactate and lactic acid are preferred. Ethyl is more preferable, and ethyl alcohol, isopropyl alcohol, and ethyl lactate are even more preferable. The lactic acid contained in the lactic acid ester may be any of L-lactic acid, D-lactic acid and DL-lactic acid. The alkyl group of the lactate ester may be linear or branched.

As the component (a), one type may be used alone, or two or more types may be used in combination. Further, the component (a) may be a naturally-derived one or an industrially synthesized artificial one, but a naturally-derived one is preferable from the environmental aspect.

The content of the component (a) is preferably 50 parts by mass or more and 95 parts by mass or less, more preferably 60 parts by mass or more and 90 parts by mass or less based on 100 parts by mass of the total of the components (a) and (b). is there. When the content of the component (a) is 95 parts by mass or less, the detergency and non-residuality are sufficient, and the problems of danger (flammability) and toxicity do not become apparent, which is preferable. Further, when the content of the component (a) is 50 parts by mass or more, the detergency and non-residuality are sufficient, and the object to be cleaned does not exhibit corrosive properties, which is preferable.

<(b) Water-soluble component having decomposition reactivity with building sealing material>
The component (b) is a water-soluble component that has a decomposition reactivity with the building sealing material. The water-soluble component is as described above.

The component (b) is preferably a component that generates a gas component when contacted with the sealing material and loses the viscosity of the sealing material. Specific examples thereof include lactic acid and methyl alcohol. Of these, lactic acid is preferred. The lactic acid may be any of L-lactic acid, D-lactic acid and DL-lactic acid.

As the component (b), one type may be used alone, or two or more types may be used in combination. Further, the component (b) may be a naturally derived one or an industrially synthesized artificial one, but a naturally derived one is preferable from the environmental aspect.

The content of the component (b) is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 10 parts by mass or more and 40 parts by mass or less based on 100 parts by mass of the total of the components (a) and (b). is there. When the content of the component (b) is 50 parts by mass or less, the detergency and non-residuality are sufficient, and the object to be cleaned does not exhibit corrosive properties, which is preferable. When the content of the component (b) is 5 parts by mass or more, the detergency and non-residuality are sufficient, and the problems of danger (flammability) and toxicity do not become apparent, which is preferable.

<(c) Water>
When the component (c) is contained, the content of the component (c) is preferably 50 parts by mass or more and 400 parts by mass or less, more preferably 100 parts by mass of the total of the components (a) and (b). It is 100 parts by mass or more and 300 parts by mass or less. When the content of the component (c) is 400 parts by mass or less, sufficient detergency can be obtained, which is preferable. Further, when the content of the component (c) is 50 parts by mass or more, the non-residuality is sufficient, and the problems of danger (flammability) and toxicity do not become apparent, which is preferable.

<(d) Other ingredients>
The cleaning agent of the present invention may contain the component (d) in addition to the components (a) to (b) or the components (a) to (c) as long as the effect of the present invention is not impaired.

Examples of the component (d) include a pH adjusting agent such as baking soda, a scrubbing material, and a cleaning auxiliary material such as PEG.

The content of the component (d) is preferably 1 part by mass or more and 7 parts by mass or less, more preferably 2 parts by mass or more based on 100 parts by mass of the total of the components (a), (b) and (c). It is 5 parts by mass or less. When the content of the component (d) is within this range, the effects of the addition of the component (d) can be sufficiently obtained without causing the adverse effect of the addition of the component (d).

<Cleaning agent>
INDUSTRIAL APPLICABILITY The cleaning agent of the present invention is effective for cleaning a building sealing material, particularly a building sealing material adhered to a metal surface such as a semi-solidified building sealing material fused to a metal surface. The construction sealing material is not particularly limited, but examples thereof include a polyurethane-based sealing material, a silicone-based sealing material, and a polysulfide-based sealing material. Examples of the metal surface include a surface of a metal jig for sealing material construction such as a sealing material agitator and a cylinder gun.

Since the cleaning agent of the present invention is a water-soluble component for all of the components (a), (b), and (c), it can be easily rinsed with a small amount of water, particularly when it contains the component (c). , Tends to be excellent in non-residuality. Further, each component is excellent in long-term storage property without being separated, and can be used after diluted with water.

Among the cleaning agents of the present invention, the cleaning agent in which the component (a) is at least one of ethyl alcohol and ethyl lactate and the component (b) is lactic acid, the component (a) is isopropyl alcohol, and the component (b) is lactic acid. A detergent, (a) component is at least one of ethyl alcohol and ethyl lactate, (b) component is lactic acid, (c) component-containing detergent, (a) component is isopropyl alcohol and (b) component is A detergent which is lactic acid and contains the component (c) is particularly preferable from the viewpoint of detergency.

It is preferable that the cleaning agent of the present invention is weakly acidic, for example, having a pH of 2 or more and 5 or less, because it can be suitably used even when a part of the metal jig for sealing material construction is made of an aluminum-based metal part.

The detergent of the present invention can be produced by stirring and mixing components (a) to (b) or components (a) to (c), and if necessary, component (d) at room temperature for several minutes. .. Alternatively, a mixture of water and alkyl lactate may be heated, for example, at 70±5° C. for 5 to 6 hours to produce a detergent containing water, alkyl lactate, and lactic acid and alcohol produced by hydrolysis of alkyl lactate. it can.

Hereinafter, the present invention will be described in more detail with reference to Examples. The compounds used in the examples are as follows.

(1) Component (a) ethanol: ethanol (99% synthetic specific alcohol manufactured by Nippon Alcohol Sales Co., Ltd.)
Isopropyl alcohol (IPA): Isopropyl alcohol (Nitto Chemical Industry Co., Ltd.)
Ethyl lactate: L-ethyl lactate ("PURASOLV EL" manufactured by Corbion Japan Co., Ltd.)
Methyl lactate: Methyl lactate (manufactured by Tokyo Chemical Industry Co., Ltd.)

(2) Component (b) Lactic acid: L-lactic acid (“PURAC HS-88” manufactured by Corbion Japan Co., Ltd.)

(3) Sealing material for construction Sealing material a: Modified silicone sealing material (“Hamatite SC-MS2NB” manufactured by Yokohama Rubber Co., Ltd.)
Sealing material b: Polyurethane-based sealing material ("Hamatite PU2NB" manufactured by Yokohama Rubber Co., Ltd.)
Sealing material c: Polysulfide-based sealing material (“Hamatite SC-PS2” manufactured by Yokohama Rubber Co., Ltd.)

<Example 1>
90 parts by mass of IPA and 10 parts by mass of lactic acid were stirred and mixed for 3 minutes to produce a cleaning agent. Using this cleaning agent, detergency, non-residual property, danger (fire fighting) and toxicity (working safety) were evaluated by the following methods. The results are shown in Table 2.

(1) Detergency Assuming the cleaning of the metal jig after the application of the sealing material on the construction site, the base materials of the building sealing materials a to c, the curing agent and the color masterbatch are mixed with the composition shown in Table 1. After that, 0.2 g of each was left for 2 hours on a stainless steel chip (20 mm×50 mm×2 mm).

In a transparent PET container, 10 g of the cleaning agent and the above-mentioned chips after standing were put, and after shaking for 5 minutes, the molten state was visually observed and evaluated according to the following criteria.
◯: The sealing material was completely dissolved and became a uniform liquid.
Δ: The sealing material was not dissolved, but was finely dispersed on the chip or in the cleaning agent.
X: The sealing material remained as a lump on the chip or in the cleaning agent.

(2) Non-residual property The chip after the washing test is immersed in a container containing 50 g of water, and the water after shaking for 5 minutes is sampled and subjected to gas chromatography (“GS320” manufactured by Gas Black Industry Co., Ltd.). The surface condition was observed with an optical microscope and evaluated according to the following criteria.
◯: No peak other than water was detected by gas chromatography, and it was clean even under a microscope.
Δ: A slight amount of peaks other than water was observed in gas chromatography, or foreign matter was observed by microscopic observation.
X: Peaks other than water were clearly seen in gas chromatography, or foreign matter was clearly observed by microscopic observation.

(3) Danger (fire fighting)
Assuming the construction site work environment, the following criteria were used for evaluation.
◯: Does not ignite even if the fire point is approached at room temperature.
Δ: There is a possibility of ignition if the fire points are approached at room temperature.
×: Ignition occurs when the fire point is approached at room temperature.

(4) Toxicity (occupational safety)
Assuming the necessity of protective equipment for construction site work, the following criteria were used for evaluation.
◯: No special protective equipment required.
△: Only gas and mask can be used for work.
×: Requires gas mask, protective glasses, and vinyl gloves.

<Examples 2 to 6, Comparative Examples 1 to 4>
A cleaning agent was prepared in the same manner as in Example 1 except that the compositions of the components (a), (b) and (c) were changed as shown in Table 2, and the same evaluations as in Example 1 were performed. The evaluation results are shown in Table 2.

Claims (9)

A cleaning agent comprising (a) a water-soluble component that is a good solvent for a building sealing material, and (b) a water-soluble component that has a decomposition reactivity with the building sealing material. The cleaning agent according to claim 1, wherein the component (a) is any one of ethyl alcohol, isopropyl alcohol, methyl lactate, and ethyl lactate. The cleaning agent according to claim 1 or 2, wherein the component (b) is lactic acid or methyl alcohol. Content of (a) component is 50 mass parts or more and 95 mass parts or less with respect to 100 mass parts of the total of (a) component and (b) component, It is characterized by the above-mentioned. The cleaning agent according to one item. The content of the component (b) is 5 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the total of the components (a) and (b). The cleaning agent according to one item. The cleaning agent according to any one of claims 1 to 5, wherein the component (a) is at least one of ethyl alcohol and ethyl lactate, and the component (b) is lactic acid. The cleaning agent according to any one of claims 1 to 5, wherein the component (a) is isopropyl alcohol and the component (b) is lactic acid. The cleaning agent according to claim 1, further comprising (c) water. The cleaning agent according to claim 8, wherein the content of the component (c) is 50 parts by mass or more and 400 parts by mass or less based on 100 parts by mass of the total of the components (a) and (b). ..