JPH0771652B2 - Wet coating booth circulating water treatment agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applied to circulating water of a wet coating booth in a coating line of automobiles or household electric appliances, and is not applied to a coating booth wall, a water tank piping pump, or the like. The present invention relates to a treatment agent for circulating water in a wet coating booth for the purpose of preventing adhesion of coating paint, efficiently separating and recovering uncoated paint from circulating water, and effectively circulating the circulating water.

[Prior Art] Conventionally, the main problem in a wet coating booth is that components in the paint mist adhere to the walls of the coating booth, water tank pipes, pumps, etc., which solidify to reduce the operating efficiency of the coating booth. There was Moreover, in order to restore the operating efficiency of this coating booth, it is necessary to transfer all the water in the water tank to the outside and then remove the paint adhering to the booth wall, water tank, pump, etc. That was a lot of work.

In order to solve the above problems, for example, a method is proposed in which a treating agent as shown below is added to circulating water to adsorb the treating agent on an uncoated paint, and then the adsorbed substance is recovered and removed with a net or the like. Was done.

As one of such treating agents, there has been one using an alkaline substance such as caustic soda and soda ash as an active ingredient. Others include strong cationic surfactants and strong anionic surfactants, and as disclosed in JP-B-59-127606, those containing an alkali metal zincate as an active ingredient. there were.

[Problems to be Solved by the Invention] However, in any of the methods for recovering an uncoated coating material using any of the above-mentioned treatment agents, the uncoated coating material still has tackiness, and color change Since the thinner or the like used in this case cannot be treated, the paint adheres to the net or the like and the mesh is likely to be clogged, and the uncoated paint cannot be efficiently collected.

Moreover, if the uncoated paint treated in this way is left to stand as it is, the paint mist will settle and accumulate at the bottom of the water tank, and it will become a viscous liquid again and cannot be easily recovered. Met.

The treatment agent according to the present invention has been made by paying attention to the above situation, and the treatment agent is adsorbed to a paint mist dispersed in water, and the coating material is further wrapped to form a non-adhesive film. The purpose is to change the properties of the paint mist to non-adhesive by forming it, and also to act in the same manner for the thinner component so that it can be solidified and recovered.

[Means for Solving the Problems] A characteristic composition of a treatment agent for circulating water in a wet coating booth according to the present invention is that it is a solid at room temperature and a fatty acid insoluble or almost insoluble in water, or a solid at room temperature. ,And,
By using an alcohol that is insoluble or almost insoluble in water as an active ingredient, a substance that acts on the paint mist in water to change its surface to non-adhesive is constructed.

The substance which acts on the paint mist in water to change its surface to be non-adhesive is preferably dispersed in water before use.

Its action and effect are as follows.

[Working] The treating agent according to the present invention is usually a powdery organic substance, which is added to the circulating water of the wet coating booth in an appropriate amount and dispersed, and then the paint mist is supplied to this circulating water. Then,
These treatment agents are adsorbed on the surface of the paint mist so as to surround the paint mist, and the thinner, the monomer, and the oligomer contained in the circulating water dissolve a part of the powdery treatment agent, so that the surface of the paint mist becomes solid. A film is formed.

On the other hand, these treatment agents dissolved in the paint mist increase the viscosity of the paint and further solidify the paint mist.

The treating agent according to the present invention has a function that not only the paint mist but also the thinner component, the treating agent is adsorbed and dissolved in the thinner, floats in a gelled state, and can be easily collected together with the paint dregs.

[Effect of the invention] As a result of the above-mentioned action of the treatment agent according to the present invention, it is possible to almost completely eliminate the tackiness of the paint mist existing in the circulating water, and the paint mist becomes a net when collected as in the conventional case. It became easy to take out with a stainless steel net etc. without sticking and clogging the mesh.

In particular, acrylic-based paints, urethane-based paints, and even paints called high-solid paints that contain a lot of oligomers,
Even paints that are comparatively dispersed in water and difficult to float have come to float and are easy to collect.

Also, the solvent component in the circulating water could be taken out in a solid state, and the tackiness of the paint mist could be further lost.

Therefore, the paint mist hardly adheres to the booth wall, pump, piping, water tank wall, etc., and the number of cleanings can be extremely reduced, and the paint mist dispersed in the water is reduced, so the paint mist is sprayed from the duct. It has become possible to reduce the amount of discharge that occurs in a state.

As described above, the effect of significantly improving the paint mist capturing efficiency of the coating booth is obtained as a whole.

Furthermore, since it can be used almost regardless of pH, it is possible to prevent workers from being exposed to a strong alkaline atmosphere unlike conventional treatment agents, which improves the working environment and is extremely favorable for safety and hygiene. .

[Examples] Examples of the treatment agent according to the present invention will be described in detail below.

This treating agent is a solid at room temperature and a fatty acid insoluble or almost insoluble in water, or an alcohol which is solid at room temperature and insoluble or almost insoluble in water, and has an antiseptic agent and a surface active agent. A substance, a colorant, a pH adjuster, a bulking agent, water, etc. are appropriately added as necessary to constitute a substance that acts on the paint mist in water to change its surface to non-adhesive.

The fatty acid that is fixed at room temperature and is insoluble or almost insoluble in water is not particularly limited,
The following are specific examples. For example, capric acid, undecyl acid, lauric acid, tridecyl acid,
Myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, nonadecyl acid, arachidic acid, heneicosanoic acid, behenic acid, tricosanoic acid, lignoceric acid, pentacosanoic acid, cerotic acid, heptacosanoic acid, montanic acid, nonacosanoic acid, melicin Acid, hentriacontanoic acid, dotriacontanoic acid, tetrachoriacontanoic acid, ceroplastic acid, hexatriacontanoic acid,
Octatriacontanoic acid, hexatetraacontanoic acid,
Examples include petroceredic acid, elaidic acid, vaccenic acid, brassic acid, cerakolenic acid, sorbic acid, eleostearic acid, punicinic acid, pseudoeleostearic acid, parinaric acid, and licanoic acid. Further, natural oils and fats and derivatives containing them can be included.

The alcohol which is solid at room temperature and insoluble or almost insoluble in water is not particularly limited, but specific examples include the following.
For example, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, margaryl alcohol, stearyl alcohol, nonadecyl alcohol, eicosyl alcohol, ceryl alcohol, melysyl alcohol and the like. Natural oils and fats containing them, and their derivatives can also be included.

Having one or both of fatty acid or alcohol as an active ingredient of these treating agents, it is solid at room temperature, has the property of forming a non-adhesive film on the paint surface, is almost insoluble in water, alcohol, Various substances can be used as long as they are soluble in ethers, various esters, ketones, aromatic hydrocarbons, and thinners contained in paints.

The above-mentioned specific examples may be used alone as the active ingredient of the treatment agent, or may be used in combination.

As the shape of these treating agents, those having various particle diameters can be used, from coarse powdery form of about 60 mesh to 100 mesh and even emulsion form of several microns using water as an extender.

A relatively coarse particle size is effective in adsorbing solvent components, and a fine emulsion size is effective in making the paint mist tack-free.

Next, the present invention will be specifically described based on experimental examples.

[Experimental Example 1] Composition of treatment agent Lauric acid 300 parts by weight Water 700 parts by weight Emulsifier 3 parts by weight Preservative 1 part by weight An emulsion of lauric acid is prepared using a homomixer while heating the above mixture. After adding 0.05% by weight of this to circulating water in a water curtain type paint booth, various paints shown below were sprayed to capture the paint mist in the circulating water, and the circulating water was made to flow down to a water tank. After that, the non-adhesiveness and the post-cleaning property were measured after the paint floated in the water tank.

The amount of circulating water is 1,500 and the amount of paint applied is 5
It was carried out in Kg.

Floatability indicates the degree to which the paint mist floats on the surface of the water tank, ○ in the table indicates that the floatability is good, and Δ indicates that it is dispersed in the water in the water tank. Were visually compared and judged.

Non-tackiness indicates the ease with which the paint mist adheres to the net, and ○ indicates that it is not tacky.

The post-cleanability means the ease of cleaning when the coating booth is cleaned after coating, and ◯ means that the cleanability is good.

As a result, as shown in Table 1, the treatment agent according to the present invention is excellent in floatability, non-adhesiveness, and post-cleanability with respect to various paints, and the paints can be easily collected and the collection efficiency is high. It was confirmed. In addition, when the coating is continued, the above-mentioned treatment agent is further added, and the addition timing and the amount to be added can be judged depending on the state of the treated paint mist.

[Experimental Example 2-Conventional Example] Other than the use of a treating agent having an alkali metal zincate as an active ingredient (disclosed in Japanese Utility Model Laid-Open No. 59-127605) as a treating agent according to the prior art, In the same manner as in Example 1, it was confirmed that various paints were inferior in floatability, non-adhesiveness, and post-cleaning property, were extremely difficult to collect the paint, and had troubles such as cleaning the paint booth (No. 1). Two
table).

[Experimental Example 3] Various coating materials were tested for floating property, non-adhesiveness and post-cleaning property in the same manner as in Experimental Example 1 except that the composition of the treatment agent shown below was changed.

Composition of treatment agent Stearic acid 300 parts by weight Water 700 parts by weight Emulsifier 3 parts by weight Preservative 1 part by weight While the above mixture was heated, a homomixer was used to prepare an emulsion of stearic acid.

The results were the same as in the case of Experimental Example 1 above, and it was confirmed that the various paints were excellent in floatability, non-adhesiveness, and post-cleaning property, and the paints were easily collected and the collection efficiency was high. .

[Experimental Example 4] Various coating materials were tested for floating property, non-adhesiveness and post-cleaning property in the same manner as in Experimental Example 1 except that the composition of the treatment agent shown below was changed.

Composition of treatment agent Stearyl alcohol 300 parts by weight Water 700 parts by weight Emulsifier 3 parts by weight Preservative 1 part by weight While stirring the above mixture, an emulsion of stearyl alcohol was prepared using a homomixer.

The results were the same as in the case of Experimental Example 1 above, and it was confirmed that the various paints were excellent in floatability, non-adhesiveness, and post-cleaning property, and the paints were easily collected and the collection efficiency was high. .

[Experimental Example 5] The composition of the treating agent shown below was changed, the addition amount was set to 0.1% by weight with respect to the circulating water, and the other coating materials were floated, non-adhesive and post-cleaning in the same manner as in Experimental Example 1. Was tested.

Composition of treatment agent Stearic acid powder 1000 parts by weight (60 to 80 mesh) Wetting agent 10 parts by weight Preservative 1 part by weight The results are the same as in the case of Experimental Example 1 above, and are floatable and non-adhesive to various paints. It was confirmed that the coating composition has excellent properties and post-cleaning properties, the paint can be easily collected, and the recovery efficiency is high.

[Experimental Example 6] The composition of the treating agent shown below was changed so that the amount added was 0.1% by weight with respect to the circulating water, and other conditions were the same as in Experimental Example 1 except that the various coating materials were floated, non-adhesive and post-cleaning Was tested.

Composition of treating agent Ethyl cellulose 1000 parts by weight (80 mesh) Wetting agent 10 parts by weight Preservative 1 part by weight The results are the same as in the case of the above-mentioned Experimental Example 1; It was confirmed that the paint has excellent properties, the paint can be easily collected, and the collection and efficiency are high.

[Experimental Example 7] The composition of the treatment agent shown below was changed so that the amount added was 0.1% by weight with respect to the circulating water, and otherwise the same as in Experimental Example 1 with respect to various paints, floatability, non-adhesiveness and post-cleanability. Was tested.

Composition of treatment agent Polyvinyl butyral 1000 parts by weight (80 mesh) Wetting agent 10 parts by weight Preservative 1 part by weight The results are the same as in the case of Experimental Example 1 above. It was confirmed that the washability was excellent, the paint could be easily recovered, and the recovery efficiency was high.

Claims (2)

[Claims] 1. A fatty acid which is solid at room temperature and insoluble or almost insoluble in water, or solid at room temperature,
Also, a treatment agent for circulating water in a wet coating booth, which comprises a substance that acts on paint mist in water to change its surface to non-adhesive by using alcohol that is insoluble or almost insoluble in water as an active ingredient. 2. The treating agent for circulating water in a wet coating booth according to claim 1, wherein the substance that acts on the paint mist in water to change its surface to be non-adhesive is dispersed in water.