KR100440899B1 - Method manufacture of detackifixation agent for paint - Google Patents

Abstract

The present invention relates to a paint detackifier for removing the viscosity of paint present in the circulating water of a paint wet paint line.

The present invention for this purpose is a mixing process of mixing formaldehyde (Formaldehyde) 21 ~ 23ml and melamine (Melamine 15 ~ 17g; A primary heating step of obtaining a viscous formaldehyde melamine resin by heating at 70 to 75 ° C. for 7 to 10 minutes after the mixing step; A second heating step of heating 230-250 ml of 4-6% hydrochloric acid (HCL) to the synthesized resin after the first heating step and heating it at a temperature of 85-90 ° C. for 14-16 minutes until it becomes purple; After the secondary heating process, the above solution is left at room temperature for 17-22 minutes to further mature the violet process; After the aging process, a purple solution and distilled water (H ₂ O) 90-110 ml are sufficiently stirred to undergo a gelation prevention process, thereby forming a cationic water-soluble polymer.

The present invention configured as described above is to add a viscosity remover in the circulating water of the paint wet painting line to completely remove the viscosity of the paint to effectively remove the paint flowing into the circulating water.

Description

METHODS MANUFACTURE OF DETACKIFIXATION AGENT FOR PAINT}

The present invention relates to a method for manufacturing a paint viscosity remover, and more particularly, when the viscosity remover is added to the circulation water of a paint wet paint line, the viscosity of the paint is completely removed to effectively remove the paint introduced into the circulation water. will be.

As is well known, when over sprayed paint generated from paint paint booth enters the paint line circulating water through the water curtain, the paint is applied to the booth wall or the circulation pump due to the high viscosity. This can lead to equipment damage and other inefficient working conditions. In order to improve the working environment, when the viscosity removal agent and flocculation agent are added to the circulating water, the viscosity of the paint is completely removed and then the flocculation injury can be effectively removed.

However, the conventional viscosity remover is not excellent in the dispersibility of the paint is not easy to manage distilled water circulating water, the sludge is generated a large amount of waste distilled water treatment costs are generated.

In addition, conventionally, a large amount of chemicals must be used, and a problem arises in that it cannot be used for all kinds of paints.

The present invention has been made to solve the above-mentioned problems of the prior art, and the first object is to provide excellent dispersibility of the paint by removing the excellent viscosity, the second purpose is to control the circulation water because the pH fluctuation width is small The third purpose is to reduce the cost of waste distilled water due to the small amount of sludge generated, and the fourth purpose is to condense small alkali input and distilled water quality other than pate. Easy paint sludge can be obtained, and the sixth purpose is to provide excellent paint viscosity removal effect on all kinds of paints with less chemical use.

In order to achieve the above object, the present invention is a paint viscosity remover that removes the viscosity of paint present in the circulation water of a paint wet coating line, in which 21-23 ml of formaldehyde and 15-17 g of melamine are mixed. Mixing process; A primary heating step of obtaining a viscous formaldehyde melamine resin by heating at 70 to 75 ° C. for 7 to 10 minutes after the mixing step; A second heating step of heating 230-250 ml of 4-6% hydrochloric acid (HCL) to the synthesized resin after the first heating step and heating it at a temperature of 85-90 ° C. for 14-16 minutes until it becomes purple; After the secondary heating process, the above solution is left at room temperature for 17-22 minutes to further mature the violet process; After the aging process, a purple solution and distilled water (H ₂ O) 90 ~ 110ml is sufficiently stirred to go through the gelation ring process provides a method for producing a paint viscosity remover characterized in that the cationic water-soluble polymer is synthesized.

Hereinafter, described in detail a preferred embodiment of the present invention for achieving this purpose are as follows.

Before describing the manufacturing method of the paint viscosity remover applied to the present invention, first, the viscosity removal and dispersion processes and the aggregation and flotation processes will be described.

Viscosity removal and dispersion process is performed by first separating fine particles of paint to remove viscosity and dispersing in water to prevent over sprayed paint particles from adhering to paint booth walls or other facilities. A step is necessary. Alkali (Na ₂ CO ₃ , NaOH ...) alone removes the viscosity of the paint particles and even disperses, but the reason for adding a viscosity remover is to act as an intermediate medium to enable two-phase flocculation. Alkali (Na ₂ CO ₃₎ and the coating line can cycle the viscosity scavenger is injected the alkali (Na ₂ CO _3), and is dissolved in the CO ₃ ^2- 2Na ⁺ form, when the viscosity is more scavenger introduced into the CO ₃ ^2- ion Are attached around the detackifier molecule, a cationic water-soluble polymer with a positive charge. In this state, when the over sprayed paint is added, -O ^- of the hydrophilic group CO ₃ ^2- adhered to the dedusting agent molecule is attached to the (+) functional group around the paint particles to hydrophilize the surrounding paint particles. That is, the attraction (viscosity) between the paint particles is cut off and at the same time, it provides effective dispersibility. Since the role of hydrophilizing and dispersing paint particles is CO ₃ ^2- , alkali (Na ₂ CO ₃ ) alone without viscosity remover removes the viscosity of paint particles and allows some dispersion. However, the reason for administering the detackifier is to prevent dispersed paint particles from reattaching. In other words, if the paint particles are in close contact with each other, functional groups that can cause interaction may recombine. To prevent this, it is necessary to keep the paint particles away from each other. Viscosing agents play an important role in spatially separating and dispersing paint particles because of their large molecular size.

On the other hand, the flocculation and flotation process uses a cationic polymer coagulant to agglomerate the dispersed paint particles. When the coagulant is introduced into the circulation water where the paint is dispersed, the positive charge of the coagulant and the outermost angle of the dispersed paint particles are used. The strong attraction between the negative (-) charges of CO ₃ ^2- in the coagulation reaction occurs, forming a large floc. The reason why the dispersed paint particles are not aggregated by the coagulant without adding the viscosity remover is that both the coagulant and the paint particles are polymers, so that the conditions of the functional groups of both particles causing attraction due to steric hindrance cannot collide with each other. Because. Each molecule of the de-viscoating agent not only acts as a bridge that connects these functional groups, but also prevents interaction between paint particles, effectively maintaining the dispersion of paint particles.

Other distilled castle tack remover and an alkali (Na ₂ CO _3, NaOH) the mixture when distilled water color to change to turbidity because the Cl that was being held in the viscosity ^remover-by phenomenon caused by ions and Na ⁺ acts, NaCl distilled water This is the same phenomenon that appears when dissolved in. The paint is effectively killed initially but the paint particles are stuck over time because of the lack of killing agents that do not sustain dispersion of the paint particles. The reason why paint loses its killing power from an early stage is the lack of alkali. In other words, due to the small amount of CO ₃ ^{2 −} that can hydrophilize the surrounding paint particles, the interaction between the paint particles was not completely blocked. Even if the viscosity remover and alkali contained in an appropriate amount, the paint killing effect may vary depending on the flow rate or stirring speed. The faster the circulating water flow rate, the higher the collision frequency between the paint particles and the killing agent molecules.

Hereinafter will be described a method of manufacturing a paint viscosity remover applied to the present invention.

First, the present invention is a paint viscosity remover that removes the viscosity of the paint present in the circulating water of the paint wet coating line, and forms 21 to 23 ml (preferably 22 ml) and melamine (Melamine) 15 to 17 g ( Preferably mixing step 16g); A primary heating step of obtaining a viscous formaldehyde melamine resin by heating at 70 to 75 ° C. (preferably 72 ° C.) for 7 to 10 minutes (preferably 9 minutes) after the mixing step; 4-6% (preferably 5%) hydrochloric acid (HCL) 230-250ml (preferably 240ml) was added to the synthesized resin after the primary heating step, and then at a temperature of 85-90 ° C until it became purple. A secondary heating step of heating for 14-16 (preferably 15 minutes); After the secondary heating step, the above solution is left at room temperature for 17-22 (preferably 20 minutes) for aging process to make the purple more dark; After the aging process, a purple solution and distilled water (H ₂ O) 90-110 ml (preferably 100 ml) are sufficiently stirred to undergo a gel ring process to synthesize a cationic water-soluble polymer to prepare a paint viscosity remover.

* At this time, the weight percent and the composition ratio of the formaldehyde (Formaldehyde) and melamine (Melamine) and hydrochloric acid (HCL) and distilled water (H ₂ O) is made as shown in Table 1.

ingredient weight % Composition Formaldehyde 5.0 ~ 7.0 One Melamine 3.0 ~ 5.0 0.67 Hydrochloric Acid (HCL) 2.2-4.2 0.53 Distilled Water (H ₂ O) 85.8 ~ 87.8 14.47

In the present invention, the formaldehyde (Formaldehyde) and melamine (Melamine) and hydrochloric acid (HCL) and distilled water (H ₂ O) is preferably made of weight percent of 6.0, 4.0, 3.2, 86.8, respectively, the composition ratio of formaldehyde When it is set to 1 as a reference, it is preferable that it is made of melamine 0.67, hydrochloric acid (HCl) 0.53, and distilled water (H 2 O) 14.47. Here, the method for calculating the weight% shown in Table 1 is shown in Table 2 below. Table 2 ingredient Main quantity d (g / ml) Weight (g) Weight (%) Formaldehyde 22.0 ml 1.08 22.0 * 1.08 = 23.76 6 Melamine 16.0 g - 16.0 4 5% HCl 240.0 ml 1.19 (HCl) 12.0 ml (HCl) 1.19 * 12.0 = 14.28 3.2 1.00 (H2O) 228 ml (H2O) 1.00 * 228.0 = 228 86.8 H2O 100.0 ml 1.00 100.0 * 1.00 = 100 Sum 382.04 100 * Note) Weight (g) is mass (injection volume) * density, * denotes multiply, where HCl is diluted to 5% in Table 2, so the amount of pure HCl is 240ml * 0.05% = 12ml And the remaining 228 ml is the amount of distilled water diluted in HCl. An embodiment of the present invention is as follows.

(Example)

First, 200 ml of distilled water is added to a 250 ml beaker, and then 1 ml of the viscosity remover of the present invention is added thereto. At this time, when the stirrer speed is 5000rpm or more, more effective dispersion can be observed by using 400ml of distilled water in a 500ml beaker.

Second, while stirring the solution, 3 ml of 15% aqueous alkali (Na ₂ CO ₃ ) solution is added (pH = 10.8).

Third, 2 ml of paint is added and stirred until the paint particles are completely de-viscosified and dispersed.

Fourth, 1 ml of flocculant is added to flocculate the dispersed paint particles. In the beaker test, flocculated floc may not be injured in the beaker test, but in the actual coating line, bubbles generated due to large drop of circulation water are easily injured because they are collected into the floc.

As a result of the above embodiment, the paint viscosity removal test according to the pH conditions is shown in the table below.

* The test procedure for each test and the input composition ratio other than alkali are the same as the "Test method for the performance of the product".

-250 g of circulating water

-1g of viscosity remover

-Paint (acrylic) 2g

-1 g of flocculation floc

In the application of the paint viscosity remover of the present invention, a predetermined amount of viscosity remover and alkali (Na ₂ CO ₃ ) are added to a paint booth circulating water to maintain a pH of 10.8. In other words, if the pH of the point where the over sprayed paint starts to flow is maintained at 10.8, an optimum paint killing effect is obtained.

The input point of the flocculant may be a point where the introduced paint is sufficiently killed by the detackifier and the alkali. The input amount may be sufficient to sufficiently aggregate only the incoming paint amount. This is because when the coagulant is excessively added, the viscosity remover and alkali contained in the circulating water are unnecessarily consumed. In other words, the flocculant does not agglomerate the paint particles but reacts with the viscosity remover by using alkali as a medium to cause unnecessary coagulation reaction.

As described above, the present invention is excellent in dispersing power of paint due to excellent viscosity removal, pH fluctuation range is easy to manage the circulating water, it is possible to reduce the waste distilled water treatment cost because the amount of sludge generated. In addition, it can cope with low alkali input amount and distilled water quality other than pate, obtain paint sludge that can be easily dehydrated, and provide excellent paint viscosity remover to all kinds of paints with low chemical use. It is intended to greatly improve.

Claims (2)

In the paint viscosity remover for removing the viscosity of the paint present in the circulation water of the paint wet coating line, Mixing process of mixing 21-23 ml of formaldehyde and 15-17 g of melamine; A primary heating step of obtaining a viscous formaldehyde melamine resin by heating at 70 to 75 ° C. for 7 to 10 minutes after the mixing step; A second heating step of heating 230-250 ml of 4-6% hydrochloric acid (HCL) to the synthesized resin after the first heating step and heating it at a temperature of 85-90 ° C. for 14-16 minutes until it becomes purple; After the secondary heating process, the above solution is left at room temperature for 17-22 minutes to further mature the violet process; After the aging process, a purple solution and distilled water (H ₂ O) 90 ~ 110ml by sufficiently stirring to prevent the gelation process of the cationic water-soluble polymer is a method for producing a paint viscosity remover characterized in that the synthesis is made. delete