KR20160071864A - Apparatus and method for processing wasted powder coating - Google Patents

Abstract

According to the present invention, disclosed are a device for treating waste powder coating material and a method for treating waste powder coating material by using the same. The device for treating waste powder coating material comprises: a filtering unit for collecting waste powder coating material from produced powder coating material, and filtering the waste powder coating material; a dispersing unit connected with the filtering unit, and transferring and dispersing the waste powder coating material filtered by the filtering unit; and a pulverizing unit connected with the dispersing unit, and producing the dispersed waste powder coating material into a solid flake. According to the device for treating waste powder coating material and the method for treating waste powder coating material, waste powder coating material is utilized, so costs spent in wasting waste powder coating material are saved. Also, environmental contamination is reduced, and the productivity of powder coating material is improved.

Description

[0001] APPARATUS AND METHOD FOR PROCESSING WASTED POWDER COATING [0002]

The present invention relates to an apparatus and a method for treating waste powder coating, and more particularly, to a waste powder coating processing apparatus and method for treating waste powder that are produced in the process of manufacturing waste powder coating material so as to be recyclable.

In general, powder coating is an environmentally friendly paint that does not contain solvents unlike liquid coatings. Powder coatings have been widely applied to home appliances and general steel products for the past decades. Unlike liquid coatings, powder coatings have been used extensively because they have the advantage of being less poisoning by a solvent, have. In addition, powder coatings vary in their types, but epoxy-polyester coatings, epoxy coatings, polyester-based coatings and acrylic-based coatings are predominant, depending on the resin components. At this time, the powder coating material does not contain a solvent in the composition and is formed in powder form, and is attracted to the object to be coated, heated and melted to form a coating film.

Powder coatings are prepared through a compounding-mixing-dispersion-grinding step. In particular, it is formed into a powder having an average particle diameter of about 30 탆 to 50 탆 at the pulverizing step. At this time, 3% to 5% of fine particles having a particle size of 10 mu m or less are contained. These fine powders are collected in the pulverizing step in order to inhibit the workability of the powder coating material, and the fine particles collected in the pulverizing step are called pulverulent powder coatings. On the other hand, although the waste powder coating material has the same components as the powder coating material, it is difficult to recycle because it is a fine powder having a particle size of 10 탆 or less and is treated as waste. As a result, the waste powder coating causes the cost of treatment and causes environmental pollution as waste. In addition, the generation of such a powder coating material may also mean a reduction in yield in the process of powder coating production.

On the other hand, Korean Patent Application No. 10-2009-0084328 (entitled "Reprocessing method of waste powder coating material, recycled powder coating material including waste powder coating material and method of manufacturing recycled powder coating material)", and Korean Patent Application No. 10-2005-0044661 (the name of the invention: a recycling system for waste powder coating), etc. However, in order to treat a pulverulent powder coating material having a particle size of 10 탆 or less still, I am having difficulties.

An object of the present invention is to provide a waste powder coating apparatus and method for treating a powder coating material of a fine powder form produced in a powder coating material manufacturing process so as to be recyclable.

The present invention relates to a filtration unit for collecting a waste powder coating material from the powder coating material and filtering the waste powder coating material; A dispersion unit connected to the filtration unit to transfer and disperse the waste powder coating material filtered by the filtration unit; And a crushing part connected to the dispersing part to form the dispersed waste powder coating as a solid flake.

The dispersing unit may further include: a housing part positioned between the filtering part and the crushing part; A shaft portion located inside the housing portion along a conveyance direction of the waste powder coating material; A screw portion adjacent to the filtration portion and formed in a spiral shape on an outer peripheral surface of a kind of end portion of the shaft portion and transporting the filtered powder coating material while heating; And at least one of a plurality of pulverized powder coating materials disposed adjacent to the crushing portion and connected to the screw portion and positioned on the outer circumferential surface of the shaft portion to form 45 to 90 degrees with respect to the radial direction of the shaft portion, A waste powder coating apparatus characterized by comprising three paddle portions.

And a shaft groove is formed on an outer circumferential surface of the shaft portion corresponding to the pitch of the screw portion.

The present invention also provides a method of manufacturing a powder coating material, comprising the steps of: (a) collecting a powdery powder coating material from the powder coating material; (b) filtering the collected waste powder coating material; (c) the filtered pulverulent powder coating is transferred while being heated; (d) dispersing the transferred waste powder coating material; And (e) grinding the dispersed waste powder coating to produce a solid phase plate.

An apparatus and method for treating waste powder coating according to the present invention includes a filtering section, a dispersing section, and a crushing section, and treats the waste powder paint in powder form, which is produced under the powder coating preparation process, for recycling. The pulverized powder coating in the form of fine particles is collected in a filtration part, filtered, heated and transported and dispersed by a dispersing part, and pulverized by a grinding part to form solid phase flakes. Solid phase flakes can be used as raw materials in the preparation of powder coatings. Therefore, the waste powder coating apparatus and method according to the present invention have the effect of reducing the cost of disposal of the waste powder coating, reducing environmental pollution, and improving the productivity of the powder coating by recycling the waste powder coating.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a waste powder coating apparatus according to a preferred embodiment of the present invention. FIG.
Fig. 2 is a cross-sectional view showing a dispersing unit in the waste powder coating apparatus shown in Fig. 1. Fig.
3 is a perspective view showing the shaft portion, the screw portion and the paddle portion in the dispersion portion shown in Fig.
4 is a flow chart showing a method of treating waste powder coating according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a view showing a waste powder coating apparatus 100 according to a preferred embodiment of the present invention, and FIG. 2 shows a dispersion unit 102 in the waste powder coating apparatus 100 shown in FIG. 1 3 is a perspective view showing the shaft portion 123, the screw portion 125 and the paddle portion 127 in the dispersion portion 102 shown in FIG.

1 to 3, a waste powder coating apparatus 100 according to a preferred embodiment of the present invention includes a filtration unit 101, a dispersion unit 102, and a crushing unit 103, The waste powder coating material treated by the powder coating material processing apparatus 100 can be used in the powder coating material manufacturing process. Here, the waste powder coating material refers to a powder coating material which is in the form of a fine powder having a particle size of 10 탆 or less in the powder coating material produced through the preparation of the powder coating material, and is unsuitable for functioning as a powder coating material.

The filtration unit 101 collects the waste powder coating material from the powder coating material thus prepared, and filters the waste powder coating material. As a result, foreign matter is removed from the waste powder coating material, and the powder coating material is mixed. At this time, the filter network in which the filtration is performed in the filtration unit 101 is 80 mesh or more and 120 mesh or less. Here, the mesh means the number of meshes included in a square of 1 inch (25.4 mm). Specifically, if the filter net is 80 mesh or less, foreign matter can not be properly removed from the filtration unit 101, and if the filter net is 120 mesh or more, filtration of the waste powder coating is difficult in the filtration unit 101 The yield and productivity are lowered. Therefore, it is preferable that the filter network has 80 mesh or more and 120 mesh or less.

On the other hand, the filtering part 101 is provided with a vibrating part 111. The vibrating section 111 applies vibration to the filtration section 101, and the waste powder coating material can be mixed smoothly in the vibrating filtration section 101.

The dispersion unit 102 is connected to the filtration unit 101 to treat the filtered powdery coating material. At this time, the filtered pulverized powder coating material is heated in the dispersing part 102 to be formed into a gel form, and is transported and dispersed. The dispersing portion 102 includes a housing portion 121, a shaft portion 123, a screw portion 125, and a paddle portion 127.

The housing part 121 is positioned between the filtering part 101 and the crushing part 103 to connect them and provide a transport path of the waste powder coating supplied from the filtration part 101. [

The shaft portion 123 is accommodated in the housing portion 121 and positioned along the transport direction of the waste powder coating material. That is, the shaft portion 123 is positioned toward the crushing portion 103 from the filtration portion 101.

The screw portion 125 is formed in a spiral shape on the outer peripheral surface of a kind of end portion of the shaft portion 123, adjacent to the filtration portion 101. The filtered powdery paint that has been filtered is conveyed by the screw portion 125. At this time, the temperature of the transfer space A corresponding to the screw part 125 in the housing part 121 is preferably 60 ° C to 80 ° C. If the temperature of the transfer space (A) is 80 DEG C or higher, the gel time of the waste powder coating is shortened. Here, the gel time is closely related to the temperature of the transfer space A as the time required until the gelation is lost due to the loss of fluidity due to an increase in viscosity. Specifically, when the temperature of the transfer space (A) exceeds 80 캜, the gel time of the waste powder coating is shortened and the leveling is greatly reduced, and the mechanical properties of the resulting coating are deteriorated. On the other hand, if the temperature of the transfer space (A) is less than 60 캜, the gel time becomes long and a problem of gloss occurs.

A shaft groove 123a is formed on the outer circumferential surface of the shaft portion 123 corresponding to the pitch of the screw portion 125. The shaft groove 123a preferably has a depth corresponding to 25% to 45% of the pitch length, although it is not particularly limited as long as its size does not hinder the function of the shaft portion 123. [ The shaft groove 123a can increase the amount of waste powder paint to be inserted into the pitch of the screw portion 125 to improve the transfer efficiency of the waste powder paint as compared with the case where the shaft groove 123a is not formed on the outer peripheral surface of the shaft portion 123 have.

Specifically, the pitch of the screw portion 125 can be appropriately set in consideration of the amount of the waste powder coating material and the rotational force of the shaft portion 123. The paddle portions 127 are connected to the screw portion 125 adjacent to the crushing portion 103 and form 45 to 90 degrees with respect to the radial direction of the shaft portion 123, Lt; / RTI > The maximum number of paddles 127 is three, and the transferred powder coating material is uniformly dispersed. If the number of the paddles 127 exceeds 3, frictional force of the paint increases, resulting in hyperbranched dispersion, which may result in deterioration of the paint. More preferably, the paddles 127 may be two to three, and most preferably two. On the other hand, when the paddle portion 127 is not formed, the waste powder coating material is not dispersed in a uniform state, which is not preferable.

It is preferable that the temperature of the dispersion space B corresponding to the padding portions 127 in the housing portion 121 is 80 占 폚 to 100 占 폚. If the temperature of the dispersion space (B) is out of the above-mentioned temperature range, the dispersion of the waste powder coating is lowered.

The crushing unit 103 is connected to the dispersing unit 102 to crush the dispersed waste powder coating material to form a solid flake. At this time, the solid flake has a size of 3 mm to 10 mm and can act as a raw material in the production of the powder coating material.

The waste powder coating material treatment apparatus 100 according to the present embodiment treats the powder powder coating material in the above-described manner, and the treated waste powder coating material can be recycled for preparing the powder coating material.

4 is a flow chart showing a method of treating waste powder coating according to a preferred embodiment of the present invention. The waste powder coating method according to a preferred embodiment of the present invention shown in FIG. 4 will be described with reference to the powder coating apparatus 100 described above.

First, a step (S101) of collecting the powdery powder coating material from the prepared powdery coating material is performed. In step S101, the waste powder coating material is collected in the filtration unit 101. Here, the waste powder coating material refers to a powder coating material which is in the form of a fine powder having a particle size of 10 탆 or less in powder coating material produced through the preparation of powder coating material, and is unsuitable for serving as a powder coating material. That is, the separation of the powder coating material capable of functioning as a coating and the powder coating material of a non-powder form is performed.

Next, a step (S102) in which the collected waste powder coating material is filtered is performed. In step S102, the waste powder coating is filtered through the filtration unit 101 to remove foreign matter contained in the waste powder coating. At this time, the waste powder coating material may be mixed.

Next, step S103 is performed in which the filtered powdery paint is heated and transferred. Step S103 is performed by the screw portion 125 of the dispersing portion 102. [ At this time, the temperature of the transfer section A corresponding to the screw section 125 is preferably 60 占 폚 to 80 占 폚. If the temperature of the transfer space (A) is 80 DEG C or higher, the gel time of the waste powder coating is shortened. This causes deterioration of the waste powder coating, which causes deterioration in quality such as loss of gloss in the recycling of the waste powder coating. On the other hand, if the temperature of the transfer space (A) is 60 DEG C or less, the transfer rate of the waste powder coating material is lowered. Therefore, when the temperature of the transfer space A satisfies the above range, the waste powder coating material is transferred in a stable state in step S103.

Next, a step S104 of dispersing the transferred waste powder coating material is performed. In addition, the step S104 is performed by the paddle portions 127 of the dispersing portion 102. At this time, the temperature of the dispersion space (B) is preferably 80 to 100 ° C, and the waste powder coating material is smoothly dispersed by the paddle portions 127.

Next, a step (S105) is performed in which the dispersed waste powder coating material is pulverized to be solid flakes. Step S105 is performed by the crushing section 103, and the solid flakes have a size of 3 mm to 10 mm and can be recycled as a raw material in the production of the powder coating material.

Meanwhile, in order to confirm the performance of the waste powder coating material treated by the waste powder coating material processing apparatus 100 and the method according to this embodiment as a raw material for the preparation of the powder coating material, the following experiment was conducted.

[Example 1]

In the compounding-mixing-dispersion-grinding process, the waste powder coating is collected as a by-product having a particle size of 10 μm. The collected waste powder coating material is removed by the waste powder coating apparatus 100 of the present invention, and a specific temperature condition (transporting space: air) is obtained by a combination of three paddle portions and a screw portion (space of 30% 70 ° C, dispersion space: 100 ° C) to produce solid flakes.

[Example 2]

In Example 1, solid flakes were produced in the same manner as in Example 1, except that the number of paddle portions was set to two.

[Experimental Example 1]

The solid flakes prepared in Example 1 were put into a powder coating material blend at a ratio of 80% by weight, and a powder coating material prepared by a conventional powder coating process was formed into a coating film.

[Experimental Example 2]

A coating film was prepared in the same manner as in Experimental Example 1, except that the solid flakes prepared in Example 2 were added to the powder coating material blend at 80% by weight.

[Reference Example 1]

In the comparative example, a powder coating material prepared by using a powder coating material of 100 wt% was formed into a coating film.

[Comparative Experimental Example 1]

Except that 80 weight% of the solid flakes prepared according to Example 1 were put into the powder coating material blend and a dispersing step using four paddles arranged while forming 90 degrees with each other was performed. A coating film was prepared in the same manner.

[Comparative Experimental Example 2]

Except that the shaft pits were not formed on the outer circumferential surface of the shaft portion, while the paddle portions were placed in the powder coating material blend at a rate of 90 ° with respect to the solid phase flake prepared in Example 1, , A coating film was prepared in the same manner as in Experimental Example 1.

The results of the experiment are shown in Table 1 below.

Experimental Example 1  Experimental Example 2 Reference Example 1 Comparative Experimental Example 1 Comparative Experimental Example 2 Exterior Good Good Good Appearance deterioration Appearance deterioration Foreign matter none none none none none Gel time 89 seconds 96 seconds 95 seconds 71 seconds 67 seconds Impact Good Good Good Good Good Flexibility Good Good Good Good Good Polish 93% 93% 93% 85% 85% Sulfuric acidity Good Good Good Good Good Corrosion resistance 2.5 mm 2.1 mm 2.3 mm 2.2 mm 2.2 mm Discharge rate per hour 100 kg 110㎏ 110㎏ 35 kg 10 kg Color difference value 0.4 0.4 0.4 0.2 0.2

Appearance: Visual evaluation. Good if clear and crisp.

* T / Dirt: Number of tees / dirt that can be confirmed through the naked eye. Defects if more than 3

* Gel time: Measured with 180 ° C hot plate

* Impact: measured by DuPont Impact Tester / Good when it is over 1㎏ × 30㎝

Flexibility: Measured by BYK-Gardner formula 3/16 inch / Good when no crack occurs

* Gloss: 60 ° reflectance

* Sulfuric acidity: Good after immersion in 5% sulfuric acid for 48 hours with no visual changes / appearance change

* Corrosion resistance: 5% brine spray for 500 hours. Pretreatment conditions of zinc phosphate coating

* Dispersion condition: ZSK-30 model, Flakes the powder with the same condition (Color / Brown)

* Color Difference: Minolta Color Difference / Color Difference standard is based on final color sample.

As shown in Table 1, Experimental Example 1 and Experimental Example 2 showed almost the same results as in Reference Example 1 in which the powder coating material was 100%. Particularly, the results of Experimental Example 2 showed properties similar to those of the powder coating material, It was confirmed that it is most preferable to form the two layers. That is, if the waste powder coating material prepared by using the waste powder coating apparatus of the present invention is contained in an amount of 80 wt% or less, it can be used as a powder coating material.

Also, referring to the results of Comparative Experiment Example 1, it was confirmed that, when the number of paddles exceeds 3, the increase of the paddle portions may cause a reduction in gel time and an appearance degradation due to over dispersion.

Also, referring to the results of Comparative Experiment Example 2, when the number of paddles exceeds 3 and shaft grooves are not formed, not only the gel time is reduced and appearance is lowered as compared with the experimental examples, And the productivity is decreased.

Therefore, the waste powder coating material to be treated through the waste powder coating apparatus according to the present embodiment can be obtained through a waste powder coating apparatus in which a maximum of three paddles are formed and a shaft groove is formed on the outer circumferential surface of the shaft, Effect can be exerted.

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the present invention. In addition, the description in parentheses in the description of the claims is intended to prevent obscuration of the description, and the scope of the claims of the claims should be construed to include all the items in parentheses.

100: waste powder coating apparatus
101:
102:
121: housing part
123: shaft portion
123a: shaft home
125: screw part
127: Paddle portion
103: Crushing section

Claims (4)

A filtration unit for collecting the waste powder coating material from the powder coating material and filtering the waste powder coating material;
A dispersion unit connected to the filtration unit to transfer and disperse the waste powder coating material filtered by the filtration unit; And
And a crushing portion connected to the dispersing portion to form the dispersed powdery coating material into solid flakes.
The apparatus according to claim 1,
A housing part positioned between the filtration part and the crushing part;
A shaft portion located inside the housing portion along a conveyance direction of the waste powder coating material;
A screw portion adjacent to the filtration portion and formed in a spiral shape on an outer peripheral surface of a kind of end portion of the shaft portion and transporting the filtered powder coating material while heating; And
Wherein the pulverized portion is located on the outer circumferential surface of the shaft portion so as to form an angle of 45 DEG to 90 DEG with respect to the radial direction of the shaft portion adjacent to the grinding portion, Wherein the paddle portion includes paddle portions.
3. The method of claim 2,
And a shaft groove is formed on an outer circumferential surface of the shaft portion corresponding to the pitch of the screw portion.
(a) collecting a waste powder coating material from the prepared powder coating material;
(b) filtering the collected waste powder coating material;
(c) the filtered pulverulent powder coating is transferred while being heated;
(d) dispersing the transferred waste powder coating material; And
(e) pulverizing the dispersed waste powder coating to produce a solid phase plate.

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