JPH0350284A - Treating agent for water circulating in wet coating booth - Google Patents

Abstract

PURPOSE:To prepare a treating agent which is used for treating water circulating in a wet coating booth, reduces stickiness of a sprayed but unadhered coating material to enable separation and recovery of the coating material, and enables recovery of a solvent, e.g. a thinner, by suspending in water a substance which is solid at room temp. and contains a specific effective component. CONSTITUTION:A substance which is solid at room temp. and contains as an effective component at least one salt selected from the group consisting of an Al salt, Zn salt, and Fe salt of a fatty acid (deriv.), higher alcohol deriv., and alkylsulfonic acid (e.g. aluminum distearate) is suspended in water.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention can be added to Wi ring water of a wet painting booth in a painting line for automobiles or household electrical appliances, etc. Wet painting booth circulating water is designed to prevent unapplied paint from adhering to the surface of the paint booth, and to efficiently separate and recover unapplied paint from circulating water so that the circulating water can be used effectively. The present invention relates to a processing agent.

[Conventional technology]

The main problem with conventional wet painting booths is that components in the paint mist adhere to booth walls, water tanks, piping, pumps, etc., and this adheres and hardens, reducing not only the operating efficiency of the booth, but also the In order to restore operating efficiency, it is necessary to remove all of the water in the water tank to the outside and then clean and remove paint adhering to the booth walls, water tank, pump, etc., and this cleaning requires a great deal of effort. That is what we are doing.

In order to solve the above problems, the conventional method is to add the treatment agent shown below to the circulating water so that the treatment agent is adsorbed to the unpainted paint, and then collect and remove this adsorbed material with a net etc. It is recommended.

One type of treatment agent is one that has alkaline substances such as caustic soda or soda ash as an active ingredient, and another type is a strong thionic surfactant or a strong anionic surfactant. Other processing agents include
As disclosed in Japanese Patent No. 127606, the active ingredient is an alkali metal zincate.

[Problem to be solved by the invention]

However, regardless of the method of recovering unpainted paint using any of the above-mentioned processing agents, the unpainted paint still has stickiness, and furthermore, the paint thinner used for color adjustment, etc. Solvents have the disadvantage that since they cannot be separated, the paint tends to stick to the nets and clog the nets, making it impossible to efficiently recover uncoated paint. Also, if you leave the unpainted paint treated with these methods as is,
It has the disadvantage that it settles and accumulates on the bottom of the water storage tank and becomes a sticky liquid again, making it difficult to recover.

An object of the present invention is to reduce the tackiness of unapplied paint so that it can be easily separated and recovered, and to also make it possible to recover solvents such as thinner.

[Means to solve the problem]

The first feature of the wet painting booth circulating water treatment agent of the present invention is that aluminum salts, zinc salts, and iron salts are selected from the group of fatty acids, fatty acid derivatives, higher alcohol derivatives, and alkyl sulfonic acids. A substance that is solid at room temperature and contains at least one of the following as an active ingredient is mixed in water in a suspension state.

The second feature is that a substance that is solid at room temperature and whose active ingredients are esters of fatty acids or fatty acid derivatives and polyhydric alcohols having a valence of 3 or more is mixed in water in a suspension state.

The third feature is that a substance that is solid at room temperature and contains at least one of an amide compound of a fatty acid or a fatty acid derivative and an alkyl amide compound as an active ingredient is mixed in water in a suspension state.

The fourth feature is that a substance that is solid at room temperature and contains at least one of an amine salt of a fatty acid or a fatty acid derivative and an alkyl amine as an active ingredient is mixed in water in a suspension state.

The fifth characteristic configuration is that a substance that is solid at room temperature and contains a dialkyl ketone as an active ingredient is mixed in water in a suspension state.

The sixth characteristic feature is that a substance that is solid at room temperature and contains ethylene acrylic acid copolymer resin as an active ingredient is mixed in water in a suspension state. Next, the effects will be explained.

[For production]

In other words, when the above treatment agent is added to the circulating water of a wet painting booth, a large number of small particles of organic compounds dispersed in the suspension will be added to the particles of uncoated paint mixed in the circulating water. It is adsorbed to almost the entire circumference of the particles, so that the surface of each uncoated paint particle has
It is assumed that a solid film is formed.

Furthermore, even if fine particles of active ingredients such as fatty acid aluminum or fatty acid zinc dissolve in the unapplied paint in the circulating water, the active ingredients will increase the viscosity of the unapplied paint and prevent it from solidifying. promote

Furthermore, the active ingredient in the treatment agent of the present invention also adsorbs solvents such as thinners mixed in the circulating water, causing the solvents to gel and float.

Furthermore, the active ingredients of the present invention, such as aluminum salts of fatty acids or zinc salts of fatty acids, are generally used as grease thickeners (substances that act with oils and other oils to significantly increase their viscosity). On the other hand, when used together with an organic polymer binder, it also has water repellent properties that can be used as a water repellent, thereby improving layer thickness properties and non-viscosity.

〔Effect of the invention〕

Therefore, the stickiness of unpainted paint in the circulating water can be almost completely eliminated, and the unpainted paint will not stick to the mesh and clog the mesh during collection as in the past.
It can now be easily removed using a stainless steel net.

In particular, paints such as acrylic paints, urethane paints, and even paints called high-solid paints with a high oligomer content that are relatively difficult to disperse in water can now float. Furthermore, the solvent component in the water could be taken out as a solid, making it possible to further eliminate the stickiness of the unapplied paint.

As a result, almost no unpainted paint adheres to the booth walls, pumps, piping, etc., walls of the water tank, etc., and the frequency of cleaning can be extremely reduced, and there is also less unpainted paint dispersed in the water. In addition, it is now possible to reduce the amount of paint mist being discharged from the duct in the form of mist, which has the effect of improving the paint mist capture efficiency of the paint booth overall.

Furthermore, if various alkaline agents and rust preventive agents used to prevent rust in the booth are mixed into the suspension as subcomponents, the need for separate addition equipment and man-hours can be reduced.

〔Example〕

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

The treatment agent of the present invention has as its main component the following substances that are solid at room temperature mixed in suspension in water, and as subcomponents various surfactants and preservatives to increase the stability of this suspension. agent, viscosity modifier, colorant,
It is adjusted by appropriately adding a pH adjuster, a filler, a rust preventive, water, etc. as necessary.

The substance has as an active ingredient at least one of aluminum salts, zinc salts, and iron salts selected from the group of fatty acids, fatty acid derivatives, higher alcohol derivatives, and alkyl sulfonic acids.

■ Those whose active ingredients are esters of fatty acids or fatty acid derivatives and polyhydric alcohols of trihydric or higher valence.

(2) Products containing at least one of an amide compound of a fatty acid or a fatty acid derivative and an alkyl amide compound as an active ingredient.

(2) Those containing at least one of an amine salt of a fatty acid or a derivative of a fatty acid and an alkyl amine as an active ingredient.

■Those containing dialkyl ketones as an active ingredient.

■ The active ingredient is ethylene acrylic acid copolymer resin.

The suspension may contain an alkali agent or a rust preventive agent.

The fatty acids or fatty acid derivatives include capric acid, undecylic acid, lauric acid, tridecylic acid, myristic acid,
Pentadecyl acid, palmitic acid, margaric acid, stearic acid, nonadecyl acid, arachidic acid, heneicosanoic acid, behenic acid, tricosanoic acid, lignoceric acid, pentacosanoic acid 4-cerotic acid, heptacanoic acid, moncinic acid,
Nonacosanoic acid, melisic acid, hentriacontanoic acid, todoriaconconic acid, tetratriaconcunic acid, celloplastic acid, hexatriacontanoic acid, octatriacontanoic acid, hexatetraconcunnic acid, petroselaidic acid.

Elaidic acid, vaccenic acid, prasic acid, ceracolenic acid, sorbic acid, eleostearic acid.

Some of them are punisic acid, pseudoeleostearic acid, halinalic acid, arachidonic acid, lycanic acid, etc.
- In formulas, CnHtn and C0OH.

Saturated fatty acids, which can be expressed as CnHzn-+C0OH,
There are unsaturated fatty acids that can be expressed as CnHzn-+C0OH+CnHzn-scOOH, etc., and there are natural products and synthetic products, and their derivatives include those that have a hydroxyl group as a part of their alkyl group, and those that have a sulfone group, etc. It has a hydrophilic group or a hydrophobic group such as a phenyl group added thereto, and their aluminum salts, zinc salts, or iron salts can be used.

Some names of substances include aluminum distearate,
Examples include, but are not limited to, aluminum salts of stearamide sulfonic acid, aluminum hydroxystearate, and aluminum salts of stearyl sulfonic acid.

Next, in the alcohol ester of a fatty acid or fatty acid derivative shown in (1) above, the fatty acid or fatty acid derivative is as described above, and the alcohol is trivalent or higher glycerin.

Pentaerythritol, sorbitan, sorbitol.

There are things commonly called polyhydric alcohols, such as sugar.

Among these esters of fatty acids and alcohols mentioned above, compounds that are solid at room temperature are particularly effective.

These substances exist both synthetically and naturally.

Some examples include stearyl stearate, glycerin tristearate, glycerin trihydroxystearate, stearic acid pentaerythritol ester, stearic acid sorbitan ester, hydrogenated castor oil, and the like.

Next, the amide compounds or alkylamide compounds of fatty acids or fatty acid derivatives shown in (1) above are representative examples of methylene bis stearamide, ethylene bis stearamide, stearic acid amide, methylol stearamide, and hydroxystearamide. Mitoikosambis (N,
N-hydroxyethyl)amide, icosambis(N,N
-hydroxyoctyl)amide, etc., but are not particularly limited.

Next, representative examples of the dialkyl ketone acids shown in (1) above include distearyl ketone, dilauryl ketone, and the like.

Next, representative examples of the aluminum salt or zinc salt of the higher alcohol derivative include the aluminum salt of stearyl alcohol sulfonic acid.

Next, representative examples of the aluminum salt or zinc salt of the alkylsulfonic acid include zinc myristylsulfonate, zinc octadecylsulfonate, and the like.

Typical examples of fatty acids, amine salts of fatty acid derivatives, or alkylamines shown in (2) above include distearylamine, triethylamine stearate, dilaurylamine myristate, and the like.

Next, the ethylene acrylic acid copolymer resin shown in (■) above is:
Refers to ethylene acrylic acid copolymer, and also includes salts made with sodium, amine, ammonia, etc.

The above is only a representative example and is not intended to be limiting.

The amount of the above treatment agent added to the circulating water is 0.01% by weight.
If the amount is less, the effect of adding the treatment agent will be small (the above-mentioned effect of reducing the adhesion to uncoated paint will be small, and if the amount added is large, the above-mentioned effect of reducing the adhesion to uncoated paint will be reduced). The effect is so great that the uncoated paint no longer sticks to each other, and the uncoated paint becomes very small particles that float to the surface, making it difficult to collect them with a net, making it difficult to use the filter press method or pressure flotation device. It will be used somewhere.

[Experiment example] Next, the present invention will be specifically explained based on experimental examples.

[Experimental Example 1] Composition of treated material Aluminum distearate 80 parts by weight Suspension (solid content 20χ) Water 14 parts by weight Rust preventive agent
5 parts by weight preservative
After adding 0.05% by weight of 1 part by weight of the above mixture to the circulating water of a water curtain-type painting booth, spray the various paints shown below to trap the paint mist in the circulating water, and store it in the water storage tank. After the paint was allowed to flow down to a water tank, the floating properties, non-stick properties, and post-cleanability of the paint were measured.

The amount of circulating water is 5 Il, and the amount of paint applied is 50
It was carried out in g.

In addition, floating property refers to the degree to which unpainted paint floats on the surface of the water tank. In the table, ○ indicates good floating property, and Δ indicates that it is slightly dispersed in the water of the water tank. These were visually compared and determined.

Non-adhesiveness refers to the ease with which unapplied paint adheres to the screen, and O indicates no adhesion.Furthermore, post-cleanability refers to the ease with which unapplied paint adheres to the screen. This shows the ease of cleaning, and ○ indicates good cleaning performance.

As a result, as shown in Table 1, it was confirmed that the product had excellent flotation properties, non-adhesive properties, and post-cleaning properties for various paints, and that the paint could be easily recovered and the recovery efficiency was high. If painting is to be continued, the treatment agent is further added, and the timing and amount of addition can be determined based on the state of the treated paint mist.

Table 1 (Experimental Example 1) [Comparative Example] The results of using a conventional processing agent for comparison with the present invention are shown below.

Various paints were treated in the same manner as in Experimental Example 1, except that a treatment agent containing alkali metal zincate as an active ingredient (disclosed in Japanese Utility Model Application Publication No. 127605/1983) was used as a treatment agent. As shown in Table 2, the properties of the paint were found to be poor, and as shown in Table 2, it was extremely difficult to recover the paint, and it took time to clean the paint booth. was confirmed.

Table 2 (Conventional example) [Experiment example 2] Regarding high solid paint that shows strong adhesiveness even in the current amount,
The effects of the active substance of the present invention were confirmed and shown in Table 3 below.

First, we created Susbenzidine with a solid content of 20% as an active substance.
0.05 for circulating water in a water curtain type painting booth
After adding weight%, spray high solids paint,
The paint mist was captured in circulating water and allowed to flow down to a water tank, where the paint's floating properties, non-stick properties, and post-cleaning properties were evaluated.

The amount of circulating water is 51, and the amount of paint applied is 50g.
It was carried out in

Sorrow

Claims (1)

[Claims] 1. Solid at room temperature, containing at least one of aluminum salts, zinc salts, and iron salts selected from the group of fatty acids, fatty acid derivatives, higher alcohol derivatives, and alkyl sulfonic acids. A treatment agent for circulating water in a wet painting booth that contains substances mixed in suspension in the water. 2. A treatment agent for circulating water in a wet painting booth, in which a substance that is solid at room temperature and whose active ingredients are an ester of a fatty acid or a derivative of a fatty acid and a trihydric or higher polyhydric alcohol is mixed in water in a suspension state. 3. A treatment agent for circulating water in a wet painting booth, in which a substance that is solid at room temperature and containing at least one of an amide compound of a fatty acid or a fatty acid derivative and an alkyl amide compound as an active ingredient is mixed in water in a suspension state. 4. A treatment agent for circulating water in a wet painting booth, in which a substance that is solid at room temperature and containing at least one of an amine salt of a fatty acid or a derivative of a fatty acid and an alkyl amine as an active ingredient is mixed in water in a suspension state. 5. A treatment agent for circulating water in a wet painting booth, in which a substance containing a dialkyl ketone as an active ingredient, which is solid at room temperature, is mixed in suspension in water. 6. A treatment agent for circulating water in a wet painting booth, in which a substance containing ethylene acrylic acid copolymer resin as an active ingredient, which is solid at room temperature, is mixed in water in a suspension state. 7. The treatment agent for circulating water in a wet painting booth according to claim 1, 2, 3, 4, 5 or 6, wherein the suspension contains an alkaline agent or a rust preventive.