JPS6042271B2 - Additive for booth cleaning water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an additive for wet painting booth cleaning water, and more particularly to a booth cleaner for preventing paint from adhering to the booth walls, water tanks, piping, etc.

The paint booth consists of a paint room where painting work is performed and a mist processing section that collects paint mist generated in the paint room.

For collecting mist, either the dry method using a filter or the like or the wet method using washing water is used, but in large-scale painting booths, the wet method using water washing is mainly used (this method is usually called a wet booth). ) has been adopted. The biggest problem with the wet method is that the paint components in the paint mist adhere to the booth walls, water tanks, circulating water piping, water curtains, etc., and this adheres and hardens, not only reducing the operating efficiency of the booth but also causing the booth to become damaged. This causes a shortening of the demand for In particular, if paint components collected in water adhere to pumps, inner walls of piping, etc., shower nozzles, etc., the amount of circulating water decreases, causing a significant decrease in shower efficiency. As a result, problems such as paint mist being discharged outdoors and odor may occur. In order to solve the above problems, conventionally, a method of adding an alkaline substance such as caustic soda or soda ash to the washing water to suppress the stickiness of the collecting paint has been widely used.

However, this method may not be effective at all depending on the type of coating material for which the effect is insufficient. The present inventors attempted to prevent paint from adhering using various surfactants, but they were unable to obtain satisfactory results even when using relatively large amounts of hydrocarbon surfactants. First, it was found that the use of a surfactant having a perfluoroalkyl group or a perfluoroalkenyl group as at least a portion of the hydrophobic group can prevent paint from adhering to the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface. That is, the present invention relates to an additive for wet painting booth wash water containing a fluorosurfactant derived from a dimer or trimer of hexafluoropropene.

The fluorine-containing surfactant used in the present invention is a surfactant having a perfluoroalkenyl group consisting of a dimer or trimer of hexafluoropropene in at least a portion of its hydrophobic group.

Surfactants derived from hexafluoropropene include those having one C6F, - or C9F group as at least a part of the hydrophobic group, specifically (1)
perfluoroalkenyloxybenzene sulfonate,
(2) N-perfluoroalkenyloxybenzenesulfonyl, sarcosinate, (3) polyoxyethylene-N-methyl, perfluorokenyloxybenzenesulfonamide, (4) polyoxyethylene-N-methyl-N- Perfluoroalkenyloxybenzylamine, (
5) N-hydroxyethyl-N-methyl sulfuric acid ester salt of perfluoroalkenylbenzenesulfonamide,
(6) N-Hydroxyethyl-N-methyl Perfluoroalkenyloxybenzenesulfonamide phosphate ester or its salt, (7) Polyoxyethylene perfluoroalkenyloxybenzoate ester, (8) N
-Methyl-N-perfluoroalkenyloxybenzoyltaurine, (9) N-methyl-N-perfluoroalkenyloxybenzenesulfonyltaurine, (1Cj1
N-[3-(P-perfluoroalkenyloxybenzenesulfonamido)propyl]-N,N,N-trimethylammonium iodide, (11)N-(p-perfluoroalkenyloxybenzenyl)-N ,N,N-
Examples include trimethylammonium and betaine.

Perfluoroalkenyloxypenesulfonate, N-
Particularly preferred are perfluoroalkenyloxybenzenesulfonyl sarcosinate, N-hydroxyethyl-N-methyl sulfuric acid ester salt of perfluoroalkenylpensulfonamide, and the like. Such fluorine-based surfactants need only be used in an amount of 0.00001% by weight or more based on the cleaning water, and 0.0001% provides better paint adhesion prevention than 1% hydrocarbon surfactant. effect is achieved.

The additive of the present invention does not have to have the property of emulsifying and dispersing the paint solution.

Therefore, although the paint itself may float on the water or settle on the bottom of the tank, it can effectively prevent the vibration from sticking to the walls of the booth. Of course, a hydrocarbon surfactant may be used in combination to improve other properties such as dispersion and emulsification of the collecting paint, or a suitable alkaline substance may be used in combination to reduce stickiness of the paint.

The present invention will be explained below with reference to Examples.

Examples 1 to 9 and 1 to 6 90 ml of additive aqueous solution with a predetermined concentration and 10 ml of paint were placed in a 120 ml glass container with a screw stopper, and the mixture was shaken vigorously up and down for 1 minute, then allowed to stand, allowing it to stick to the glass wall. Observe the condition of the paint as much as possible.

The ability to inhibit adhesion is evaluated using the Ox formula.

The additive formulation and evaluation results are shown in Table-1. Example 10 1000 f of a 0.05% aqueous solution of perfluoronenyloxybenzenesulfonic acid sorter is used as cleaning water for a water curtain type wet booth.

The painting work was carried out for one month, during which time an amount of the above aqueous solution corresponding to the amount of washing water lost due to evaporation etc. was replenished to keep the amount of washing water almost constant.After one month, the amount of washing water was kept almost constant by taking a shower. No change was observed in the amount of emissions.

- The spray chamber walls in the wet booth and
There was almost no adhering paint stuck to the over-curtain section. In addition, when the above test was conducted using 0.5% Sorg ash as an additive, the paint that adhered to the spray chamber and the wall surface was 43k9.

Claims (1)

[Claims] 1. An additive for wet painting booth cleaning water containing a fluorosurfactant derived from a dimer or trimer of hexafluoropropene.