KR101670778B1 - Hybrid paint detackification agent - Google Patents

Abstract

The present invention relates to a hybrid paint viscous remover comprising a chemical substrate comprising monoethanolamine, sodium gluconate, aluminum sulfate and a biological substrate which is a microbial culture.

Description

Hybrid paint detackification agent < RTI ID = 0.0 >

The present invention relates to a hybrid paint viscous remover which makes it possible to effectively remove the viscous removal, dispersion, flocculation and sludge loss of paint by the interaction of the chemical substrate and the biological substrate.

Paint viscosimetric agents may include, for example, an agent to remove the viscosity (or tackiness) of the overspray paint to facilitate the removal of overspray paint from the paint spray booth It is used for the same purpose.

Paint spray booths are widely used for painting relatively large articles such as automobiles, refrigerators, for example. Generally, in a paint spray booth, the article to be coated is conveyed by a conveyor line, the paint is sprayed toward the article by a spray gun installed next to the conveyor line, and a part of the sprayed paint Is attached to the surface of the article. At this time, the remaining amount of the sprayed paint which is not attached to the article is called overspray paint.

The overspray paint forms a fine mist in the ambient air of the painted article. Leaving such a bump, due to the viscosity of the paint, the overspray paint sticks to the wall surface of the spray booth, the conveyor line, and other devices in the spray booth, and agglomerates or accumulates. To prevent this, overspray paint must be removed from inside the spray booth. For this purpose, air in the spray booth is forcibly evacuated. The forced exhaust air passes through a water curtain before exiting the spray booth, where the overspray paint in the forced exhaust air is scrubbed by water on the water wall. The water that collects the overspray paint flows into the catchment tank, which is generally located at the bottom of the spray booth. In the collecting tank, the overspray paint is removed from the water and treated as waste, and the water is recirculated back to the water wall. This water, which is fed back to the water wall by recirculation and used to collect the overspray paint, is called the circulating water.

However, since the paint is a tacky material, the captured overspray paint easily aggregates-adheres-accumulates in the circulating water to form a sludge that is sticky and sticky like tar, The pump and pipe of the circulating water system are closed. Moreover, it is very difficult to remove such sludge adhered to pumps and pipes in the circulating water system. In order to prevent this phenomenon, the paint viscous remover is added to the circulating water.

When the paint viscous remover is added to the circulating water, the overspray paint in the circulating water condenses to form fine particles, which form larger particles through the agglomeration process, and the agglomerated particles do not become sticky. That is, the purpose of the paint viscous remover is to prevent agglomerated paint particles from becoming sticky. The resulting nonadhesive aggregates are circulated together with the circulating water and collected in the collecting tank without sticking to the pump or pipe of the circulating water system. Non-tacky aggregates gathered in the collecting tank float over the surface of water and can be easily separated and discarded.

As the main component of the existing paint viscous remover, organic compounds or inorganic compounds having cohesion and / or cohesion have been mainly used. For example, U.S. Patent Application Publication No. 2004/0000329 A1 discloses a process for the preparation of a polyalkylene alkyl (meth) acrylate polymer, a metal complex salt, a hexanoic acid polymer, a montmorillonite containing clay, a poly [oxyalkylene (dialkylimino) Discloses a method for overspray paint removal using a coagulant such as a phenol-based polymer, a phenol-based polymer, a phenol-based polymer, an epihalohydrin / dialkylamine polymer, a polydiallyldialkylammonium halide polymer, a polyepiamine, In another example, Korean Patent Laid-Open Publication No. 2002-0042252 discloses a paint viscous remover comprising a cationic water-soluble polymer obtained by treating a formaldehyde melamine resin with hydrochloric acid.

However, one of the other important problems raised in relation to the removal of overspray paint is the amount of overspray paint sludge separated from the circulating water. Since most of the solid components contained in the paint viscous remover are contained in the sludge as they are, the amount of the sludge generated increases when the inorganic viscous paint detergent is used. Which in turn increases the disposal cost of the sludge.

Another important problem raised in relation to the removal of overspray paint is due to the harmful substances that may be present in the paint. For example, the paint may contain hazardous substances such as polycyclic aromatic hydrocarbons (PAH), benzene, toluene, ethylbenzene and xylene (BTEX). (Naphthalene, a kind of PAH, is known as a potent carcinogen.) Toluene, a type of BTEX, is used as a thinner for paint.) Therefore, these harmful substances remain in overspray paint sludge separated from circulating water , These sludges can be classified as specific waste. The cost of disposal of certain wastes is much higher than that of general wastes.

Korean Patent Publication No. 2002-0042252

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a water- And to provide a paint viscous remover which can reduce the amount of harmful substances in the sludge.

As a means for solving the above-mentioned problems, the hybrid paint viscous remover of the present invention comprises a chemical substrate including monoethanolamine, sodium gluconate, and aluminum sulfate, and a biological substrate as a microbial culture .

As an example, in order to remove and disperse the viscosity of the paint in the circulating water, the chemical base is firstly introduced, and the biological substrate is secondarily injected for the purpose of cohesion of paint removed and dispersed and sludge removed. do.

As an example, the chemical composition may include 20 to 40 parts by weight of monoethanolamine, 5 to 15 parts by weight of sodium gluconate, 1 to 5 parts by weight of aluminum sulfate, and 1 to 5 parts by weight of silica powder modified to have a hydrophobic surface, .

In one embodiment, the microorganism in the biological substrate is selected from the group consisting of Phanerochaete sp., Acinetobacter sp., Lysinibacillus sp., Serratia sp. , Rhodococcus sp., Burkholderia sp., Pseudomonas sp., Micrococcus sp., Or a combination of a plurality of these.

In one example, the biological substrate is further characterized in that it further comprises an additional source of nutrients for promoting the further growth of microorganisms.

As described above, the hybrid paint viscous remover of the present invention eliminates the viscosity of paint by using a chemical base material and reduces the sludge while floating the viscous paint by the biological base material, Thereby enabling an efficient and environmentally friendly paint treatment.

Hereinafter, the structure and operation of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, terms and words used in the present specification and claims are to be construed in accordance with the principles of the present invention, on the basis that the inventor can properly define the concept of a term in order to best explain his invention It should be construed as meaning and concept consistent with the technical idea of.

The hybrid paint viscous remover of the present invention is a hybrid of a chemical substrate and a biological substrate. In the case of the conventional chemical description, there is a problem in that the viscosity of the paint is removed and dispersed but the sludge generation can not be controlled. There is a strong point in reducing sludge, but the problem that sufficient effects are not exhibited in removing and dispersing the viscosity of the paint is caused by the complementary of the chemical base material and the biological base material, so that the chemical base works for the removal and dispersion of the viscous material. Thereby allowing the biological substrate to act and doubling the paint treatment efficiency.

First, the chemical base material is characterized by including monoethanolamine, sodium gluconate, and aluminum sulfate.

In order to prevent the over sprayed paint particles from adhering to the booth wall or other facilities, it is necessary to first finely separate the paint particles, remove the viscosity, and disperse them in water. Is to perform viscosity removal and dispersion.

Monoethanolamine as a chemical composition functions as a modifier of the phenol, and CO ₃ ^{2 -} ions are attached around monoethanolamine. When the oversprayed paint is added, CO ₃ ^{2 -} of the attached hydrophilic group --O ^- is attached to the (+) functional group around the paint particles to hydrophilize the paint particles. That is, it weakens the viscosity between the paint particles.

Sodium Gluconate is added as the above chemical composition, which makes it possible to weaken the inter-paint attraction by the monoethanolamine, but it is also possible to re-adhere to the weakened paint, If the paint particles are in close contact with each other due to the addition of soda, the functional groups capable of interacting with each other can be recombined. In order to prevent this, the paint particles are separated from each other. That is, to disperse the paint particles whose viscosity is weakened.

In addition, aluminum sulfate is added as the chemical composition to remove bubbles generated in the reaction of the above-mentioned compositions, and the formation of the flocculent vesicles is inhibited by bubbles at a later stage.

It is appropriate that the chemical base material includes 20 to 40 parts by weight of monoethanolamine, 5 to 15 parts by weight of sodium gluconate, and 1 to 5 parts by weight of aluminum sulfate, based on the total weight of the composition, .

However, when the mixing ratio of the aluminum sulfate exceeds the mixing range, the action mechanism of the other composition is disturbed and the effect of modifying the hydrophilicity of the paint may be insignificant or the effect of dispersing the hydrophilic paint particles may be insignificant. In some cases, there is a bubble that can not be removed if excessive bubbles are generated. Such bubbles may interfere with the formation of agglomerates between the hydrophilized paint particles, and when the bubbles are blown, they may interfere with the activity of the biological substrate by the gas, thereby deteriorating the formation of aggregates and the effect of reducing the amount of sludge.

Thus, the chemical base of the present invention provides an example in which 1 to 5 parts by weight of silica powder whose surface is hydrophobically modified with respect to the total weight is further blended. The addition of a silica powder whose surface has been modified with hydrophobicity causes adsorption of gas by bubbles and bubbles without causing reaction with the hydrophilized paint particles. That is, the flocculation float and the sludge loss mechanism by the biological substrate are smoothly performed. Here, the technique of modifying the surface of silica to be hydrophobic is a well-known technology, and a description thereof will be omitted.

In the state where the chemical base primarily removes and disperses the paint, the biological substrate is secondarily removed viscous and functions to reduce sludge while floating the dispersed paint particles .

That is, the microbial culture as the biological substrate not only allows the paint in the circulating water to easily form agglomerates, but also degrades harmful substances by biodegradation, thereby lowering the harmful substance content of the agglomerates to improve the quality of the circulating water In addition, since some of the paint components in the circulating water are metabolized and converted into cell mass or carbon dioxide, the amount of sludge (non-tacky aggregate of paint) is reduced.

The culture means a biological material obtained by culturing a microorganism.

In the present invention, the microorganism is selected from the group consisting of Phanerochaete sp., Acinetobacter sp., Lysinibacillus sp., Serratia sp., Lidococcus sp. Rhodococcus sp., Burkholderia sp., Pseudomonas sp., Micrococcus sp., Or combinations thereof.

The microorganism culture may be prepared by various known methods, for example, as described below. On a surface of an agar medium such as malt extract agar plate medium or Sabouraud agar plate medium for about 3 to 10 days at a temperature of about 23 to 33 占 폚.

The cultured microorganisms are then inoculated into a 250 ml or 500 ml Erlenmeyer flask containing about 20-100 ml of a liquid culture medium such as malt extract medium or Sabolod medium. The malt extract medium can be obtained by injecting 5 g of malt extract, 1.8 g of maltose, 6 g of dextrose and 1.2 g of yeast extract into 1 liter of deionized water. The Sabouraud medium can be obtained by injecting 10 g of casein and 20 g of dextrose in an enzymatic digest into 1 liter of deionized water.

The flask is then incubated for about 3-10 days in a shaking incubator at about 50-250 rpm and about 23-33 [deg.] C. The culture thus obtained is homogenized using a glass homogenizer or a Waring blender to obtain a culture usable in the present invention. Of course, cultures prepared by various other methods can also be used as the cultures of the present invention. The typical packed mycelium volume (PMV) of such cultures may be, for example, from about 5% to about 40% by weight.

As is well known, feneroqua techrysosporium, paneroccaete sordida, and the like are a type of white-rot fungi. The white rot fungus is able to break down the lignin component of the wood, thereby effectively bleaching the brown coloration associated with lignin.

On the other hand, paneroquaetechrysosporium, which is a secondary decomposer of hard wood and soft wood, is different from other white rot fungi in that lignin decomposition without using phenol oxidase such as laccase System. Examples of the lignin degradation system of paneroctaetechrysosporium include lignin peroxidase (LiP), manganese peroxidase (MnP), cellobiohydrolase, endo Endoglucanase, beta-glucosidase, glyoxal oxidase, xylanase, xylosidase, alpha-galactosidase (hereinafter referred to as " Various enzymes and biochemical intermediates such as pyranose 2-oxidase, superoxide dismutase, mannose-6-phosphatase, and the like participate.

The LiP and MnP enzymes isolated from paneroctaetechrysosporium can be used for the biological treatment of soils contaminated with a wide variety of organic substances such as textile dyes, polyethylene, insecticides, herbicides, dynamite, polycyclic aromatic hydrocarbons (PAH), dioxins, It is useful for purification.

When such a culture is introduced into the circulating water which has been subjected to the primary treatment by the chemical base, the paint in the circulating water not only forms an aggregate easily but also does not become viscous. That is, an organic or inorganic compound such as a coagulant or a coagulant, is not used, so that an environmentally friendly treatment becomes possible. In addition, since harmful substances are decomposed by biodegradation of the culture, the content of harmful substances in the aggregates is very low.

For example, harmful substances such as PAH and BTEX can be biodegraded by a group of microorganisms including panerocaine tercisosporium, panerocatepsoridida, and the like. Biodegradation of other harmful substances is also possible. For example, isobutyl alcohol, 2-ethylhexanol, N-butoxypropanol, N-propoxypropanol and the like can be easily metabolized by the microorganism group. Due to the biodegradability of such cultures, the sludge generated in the overspray paint removal process can be treated as general waste, thereby reducing the disposal cost of the sludge.

In addition, the organic compound content of the circulating water of the spray booth, which is measured by TOC, BOD and COD, can be reduced due to the biodegradation ability of the microorganism group culture. Accordingly, the water quality of the circulating water can be maintained in a good state. Also, the amount of sludge (non-tacky aggregates of paint) generated in the spray booth can be reduced. This is because the culture of the microorganism group metabolizes some of the paint components in the circulating water and converts them into cell mass or carbon dioxide in the course of proliferation in the circulating water of the spray booth.

For example, melamine resins or acrylic polymers can be biodegraded into small molecular weight materials by mold cultures. These small molecular weight substances are decomposed or metabolized into carbon dioxide by an additional biochemical process to produce cells.

That is to say, this is not expected from the conventional chemical treatment, that is, the treatment with the coagulant.

The present invention also provides an example wherein the biological substrate further comprises a nutrient source for promoting additional proliferation. Microbial cultures inoculated with circulating water manifest the mechanisms mentioned above as such. However, if additional proliferation occurs in the inoculated microbial circulation water, the above-mentioned mechanism will double its effect. Paint contains various chemical components.

Among them, organic carbon compounds can be used as a food source for the propagation of inoculated microorganisms. Thus, even if there is no additional nutrient source, additional growth of microorganisms within the circulating water is possible.

However, in addition to the cultures, additional growth of microorganisms in the circulating water can be much more enhanced if a nutrient source to promote additional proliferation is injected into the circulating water that collects the paint. It may also reduce the initial inoculum of the culture. Additional nutrient sources for promoting microbial proliferation or metabolism preferably contain components such as carbon sources, nitrogen sources, vitamins, minerals, and the like. A specific example of an additional nutrient source is "Bio Accelerator 32 (KAM Biotechnology Ltd., BC, Canada) ". "Bio Accelerator 32" contains essential nutrients such as yeast vegetable protein, caseins, vitamins and minerals.

The above-mentioned paint viscous remover of the present invention may be prepared by firstly injecting a chemical base material into circulating water to sufficiently remove and disperse the paint, and then, secondarily, a biological substrate is charged to form a flocculant It is reasonable to reduce the amount of sludge.

The time of inputting the biological substrate is optional depending on the conditions of the site. If it is put too early, formation of agglomerate is not easy in a state where viscous removal and dispersion are not performed properly. If it is applied too slowly, There may be a problem such as redeposition of paint particles due to inability to sustain.

It should be appreciated that the viscous removers of the present invention can be used in various fields for removing viscous materials from other paints as well as over-spray paint removal processes occurring in spray booths.

Hereinafter, the paint viscous remover of the present invention will be described in more detail through experimental examples.

Evaluation index of paint treatment effect

A standardized method for quantitatively measuring paint treatment effects has not yet been established, but several practical methods are disclosed in USP 4,992,199, 5,614,103 and 6,485,656. In the present invention, the overall performance of paint processing was analyzed using two methods. The first method measures the "supernatant permeability" of "paint solution (mixture of water and paint)" before and after the paint viscous remover treatment. The supernatant permeability is a measure of how effectively the paint sludge is separated from the paint solution. The supernatant permeability was measured at 450 nm. The second method measures the "amount of sludge generated" that occurs after the paint viscous remover treatment. The amount of sludge was measured after drying the paint sludge at 105 ° C for 8 hours.

Biodegradation effect evaluation index

The biodegradation effect of the microbial culture was evaluated by comparing the COD of the paint solution with and without the paint viscous remover of the present invention.

COD (chemical oxygen demand) means the amount of oxygen needed to oxidize the organic material contained in water. Therefore, COD can be used as an indicator of the content of organic substances contained in water. In the present invention, the measurement of COD was made by the closed reflux colorimetric method according to the Standard Test Method 5220D for analysis of water and wastewater of APHA (American Public Health Association).

Example  One

500 ml of a paint solution containing "WBC-710 6T3 Dark Green Mica" part skin and 99 parts distilled water was placed in a 1 liter capacity jar, and the substrate used in the present invention (monoethanolamine , 0.1 g of sodium gluconate, 0.05 g of aluminum sulfate, and biological equipment). After stirring the vessel, the vessel was allowed to react with the coagulant and flocculant.

Example 2

500 ml of a paint solution containing "WBC-710 6T3 Dark Green Mica" and 99 parts of distilled water were placed in a 1 liter jar, and then 0.5 g of monoethanolamine as a chemical substance, 0.1 g of concentrated sulfuric acid, 0.05 g of aluminum sulfate, 0.05 g of hydrophobic surface-modified silica, and a biological substrate. After stirring the vessel, the vessel was allowed to react with the coagulant and flocculant.

Comparative Example 1

500 ml of a paint solution containing "WBC-710 6T3 Dark Green Mica" and 99 parts of distilled water were placed in a 1 liter jar, and then 0.5 g of monoethanolamine as a chemical substance, 0.1 g of sodium hydroxide, 0.05 g of aluminum sulfate, and 0.05 g of polyacrylamide. After stirring the vessel, the vessel was allowed to react with the coagulant and flocculant.

Comparative Example 2

500 ml of a "WBC-710 6T3 Dark Green Mica" paint solution containing 99 parts of skin and 99 parts of distilled water was placed in a 1 liter jar, and then only the biological substrate was added to the container. The container was then reacted with the coagulant and flocculant.

As shown in Table 1, the paint treatment effect can be confirmed by appearance, COD, total solid content and permeability. Comparing the examples and the comparative examples in the outward appearance, it can be seen that Examples 1 and 2 and Comparative Example 1 show that the clear supernatant liquid and coagulated flaken are large in size, so that the viscous removal and dispersion and flocculation of the paint are efficiently performed. In the case of Example 2, the size of the agglomerated flakes is small, and the paint particles which are not completely decomposed are also considered floating. This is because, in the case of Comparative Example 2, when the treatment with only the biological substrate is performed, the viscosity of the paint is not sufficiently removed and dispersed, and thus the paint having less viscosity is agglomerated.

COD and total solids content, Examples 1 and 2 and Comparative Example 2 are superior to those of Comparative Example 1. This is because, in the case of Comparative Example 1, no biodegradation effect can be expected by using only a chemical substrate do.

In particular, it can be seen that the most excellent effect is exhibited in the case of Example 2, which is judged to be attributable to the addition of silica having a hydrophobic surface modified to the surface of the comparative chemical substance in Example 1, It is judged to be attributable to the adsorption of gas due to bubbles and bubbles which can inhibit the activity of the substrate and inhibit the formation of flocculated floating bodies.

In the case of the transmittance, the examples are also superior to the comparative examples, and the results of Example 2 are better than those of Example 1. In this case, too, silica having a hydrophobic surface is attached to the chemical substrate, The injuries are seen to be more smoothly done.

Therefore, it can be seen that it is proper that the chemical substance and the biological substance complement each other when the viscosity of the paint is removed and dispersed, and when the viscosity of the paint particles is removed and dispersed, and the weight of the sludge is reduced.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (5)

A chemical substrate comprising monoethanolamine, sodium gluconate, and aluminum sulfate, and a biological substrate, which is a microbial culture,
In the biological substrate,
Acinetobacter sp., Lysinibacillus sp., Serratia sp., Rhodococcus sp., Berkeley sp., Phyllochaete sp., Acinetobacter sp. Wherein the hybrid paint is a combination of one or more of the following: Burkholderia sp., Pseudomonas sp., Micrococcus sp.
The method according to claim 1,
Characterized in that said chemical substrate is primarily introduced for viscous removal of the paint in the circulating water and said biological substrate is secondarily introduced for flocculation of the viscous paint and sludge removal.
The method according to claim 1,
The chemical entity may be,
Wherein the hydrophobic silica powder comprises 20 to 40 parts by weight of monoethanolamine, 5 to 15 parts by weight of sodium gluconate, 1 to 5 parts by weight of aluminum sulfate, and 1 to 5 parts by weight of silica powder modified to have a hydrophobic surface. Paint Viscosity Remover.
delete The method according to claim 1,
Wherein the biological substrate further comprises an additional nutrient source for promoting the further growth of microorganisms.