KR102056349B1 - Membrane filter plate for filter press with improved durability and mechanical property - Google Patents

Abstract

The present invention relates to a membrane filter plate for a filter press, wherein the present invention is formed using a resin composition comprising a styrene-ethylene-butylene-styrene block copolymer, polypropylene, an organic peroxide and a filler, wherein the total weight of the resin composition As a basis, 3 to 10% by weight of styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of polypropylene, 2 to 7% by weight of filler, and the remaining amount of organic peroxide, the thickness and excellent durability and Provided is a membrane filter plate for a filter press having mechanical properties.

Description

Membrane filter plate for filter press with improved durability and mechanical properties {MEMBRANE FILTER PLATE FOR FILTER PRESS WITH IMPROVED DURABILITY AND MECHANICAL PROPERTY}

The present invention relates to a membrane filter plate for filter presses with improved durability and mechanical properties.

Due to the urbanization and industrialization of modern society, the treatment of sludge which is additionally generated in the increased treatment of various sewage and wastewater has emerged as one of the biggest problems of modern society. In general, the treatment of sewage and wastewater is to purify the sewage and wastewater through the sewage and wastewater treatment apparatus, and the sludge generated at this time is dehydrated, landfilled or incinerated.

Dewatering of sludge can proceed in both natural and mechanical ways. Natural dehydration methods include a sand dry phase method, a lagoon method, etc., but there are problems such as reducing the available land and polluting groundwater. Recently, the application of mechanical dewatering methods is increasing. In the mechanical dewatering method, a filter press, a belt press, a screw press, a centrifugal dehydrator and an electropenetrating dehydrator may be applied according to the principle of operation. Among them, the filter press includes at least two filter plates, presses the sludge into the space between the filter plates which are in contact with each other, separates the filtrate from the sludge, and then cakes (solid sludge in which the filtrate is separated). It is a device for treating sludge by removing it.

On the other hand, in the process of dewatering the sludge using the filter press, the pressure is applied to the filter plate by the sludge introduced, the pressure applied to the filter plate disappears when the sludge is dewatered. That is, since the action and release of pressure is repeatedly performed on the filter plate of the filter press, the filter plate of the filter press is required to have excellent durability and mechanical properties capable of withstanding strong pressure and pressure change.

Accordingly, Korean Patent Publication No. 10-2000-0054118 discloses a composition of a filter plate including natural rubber, synthetic rubber, sulfur, zinc oxide, stearic acid, an accelerator, a processing resin, a foaming agent, a conductive filler, and improved mechanical properties. However, the durability and mechanical properties of the filter plate is still not enough, there is a problem that the filter plate does not sufficiently endure high pressure or repetitive pressure change, causing damage or bleaching.

In addition, in the prior art, the thickness of the filter plate itself is increased to improve the durability and mechanical properties of the filter plate, but in this case, there is a problem that the usability or convenience decreases as the volume of the device decreases. In addition, as the thickness of the filter plate is increased, there is a problem that elongation, elastic modulus, etc. of the filter plate are lowered.

Republic of Korea Patent Publication No. 10-2000-0054118

SUMMARY OF THE INVENTION An object of the present invention is to provide a membrane filter plate for a filter press having a thin thickness and excellent durability and mechanical properties.

The object of the present invention is not limited to the technical problem as described above, another technical problem can be derived from the following description.

In order to achieve the above object, the present invention is a membrane filter plate for the filter press, the membrane filter plate for the filter press is a styrene-ethylene- butylene- styrene block copolymer (Styrene-Ethylene-Butylene-Styrene block copolymer), polypropylene (Poly propylene), a filler and a resin composition comprising an organic peroxide, wherein the resin composition is based on the total weight of the resin composition 3 to 10% by weight of styrene-ethylene-butylene-styrene block copolymer, polypropylene Provided is a membrane filter plate for a filter press comprising 60 to 80% by weight, fillers 2 to 7% by weight and a residual amount of organic peroxide.

The resin composition may include the styrene-ethylene-butylene-styrene block copolymer and the polypropylene in a weight ratio of 1: 8 to 19.

Wherein the filler is barium sulfate (Barium sulfate), MgO (Magnesium oxide), calcium carbonate (Calcium carbonate), titanium dioxide (Titanium dioxide), zinc oxide (Zinc oxide), alumina (Alumina), silica (Silica), mica ( It may include one or more selected from the group consisting of Mica, Talc, Clay, Bentonite , Zeolite, Glass fiber, and Carbon black. .

Wherein the filler is a calcium carbonate (Calcium carbonate), bentonite (Bentonite) and zeolite (Zeolite) 1: it may comprise 0.1 to 2 weight ratio of 0.1 to 2.

The organic peroxide is t-amyl peroxybenzoate, t-butyl hydroperoxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, t-butylperoxy isopropyl carbonate, diacetyl peroxide, Dibenzoyl peroxide, dicyclo hexane, dibutyl peroxyldicarbonate, trimethylcyclohexane, diedecanoyl peroxide, and peroxyldicarbonate.

The resin composition may further include an additive including at least one selected from the group consisting of an antifoaming agent, a pigment, an antioxidant, and a light stabilizer.

The membrane filter plate for the filter press of the present invention is formed using a resin composition comprising a styrene-ethylene-butylene-styrene block copolymer, polypropylene, an organic peroxide, and a filler, wherein the resin composition is based on the total weight of the resin composition 3 to 10% by weight of styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of polypropylene, 2 to 7% by weight of filler and the remaining amount of organic peroxide, so that the thickness and durability, The mechanical properties such as elongation and strength are excellent, and whitening may not occur.

1 is a perspective view of a membrane filter plate for a filter press according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a real photograph of the membrane filter plate for the filter press illustrated in FIG. 1.
FIG. 3 is a view illustrating a part of a filter press to which the membrane filter plate for the filter press of FIG. 1 is applied.
4 is a cross-sectional view (right side) of a membrane filter plate for a filter press and a cross section of a membrane filter plate for a conventional filter press according to an embodiment of the present invention.
FIG. 5 is a view showing Example 1 in a state where 100,000 tension and shrinkage is repeated according to Experiment (2) of Experimental Example 2. FIG.
FIG. 6 is a view showing Example 3 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 7 is a diagram showing Example 6 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 8 is a view showing Example 7 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 9 is a view showing Comparative Example 2 in a state where 100,000 tensile and shrinkages are repeated in accordance with Experiment (2).
FIG. 10 is a view showing Comparative Example 3 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 11 is a view showing Comparative Example 4 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 12 is a view showing Comparative Example 5 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 13 is a view showing Comparative Example 6 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
14 is a view showing Comparative Example 7 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.
FIG. 15 is a view showing Comparative Example 1 in a state where 100,000 tension and shrinkage is repeated according to (1) of Experimental Example 2. FIG.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention.

The terms or words used in the specification and claims of the present invention are not limited to the ordinary or dictionary meanings, and the inventors can appropriately define the concept of terms in order to explain their invention in the best way. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Throughout the specification of the present invention, when a part "includes" a certain component, it means that it can further include other components, without excluding the other components unless otherwise stated. .

In the specification of the present invention, "A and / or B" means A or B, or A and B.

Throughout the specification of the present invention, "membrane filter plate for filter press" may be simply referred to as "filtration plate".

In the entire specification of the present invention, "mechanical properties" may mean tensile strength, yield elongation, elongation at break, tensile modulus, flexural strength, flexural modulus, impact strength, and the like.

Hereinafter, the present invention has been described in detail, but the present invention is not limited thereto.

In the present invention, for filter presses with improved durability and mechanical properties Membrane Filter plate  to provide.

In one embodiment of the present invention is formed using a resin composition comprising a styrene-ethylene-butylene-styrene block copolymer (Styrene-Ethylene-Butylene-Styrene block copolymer), polypropylene (poly propylene), organic peroxide and filler The resin composition may contain 3 to 10% by weight of styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of polypropylene, 2 to 7% by weight of filler, and a balance of organic peroxide based on the total weight of the resin composition. The present invention provides a membrane filter plate for a filter press that is thin in thickness but excellent in mechanical properties such as durability, tensile strength, elongation and strength, and hardly whitening phenomenon. In addition, as the thickness is thin and the durability is excellent, economical efficiency may be improved by using a small amount of material, that is, a small amount of the resin composition.

The membrane filter plate for the filter press of the present embodiment is the present embodiment including 3 to 10% by weight of styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of polypropylene, 2 to 7% by weight of filler, and the remaining amount of organic peroxide. The resin composition of the example may be injected into a specific shape, but is not limited thereto. The specific shape may mean the shape of the membrane filter plate for all known filter presses.

Styrene-Ethylene-Butylene-Styrene block copolymer is a polystyrene-based thermoplastic elastomer, abbreviated as SEBS. The thermoplastic elastomer has properties similar to that of the elastomer but can be repeatedly deformed and restored like a thermoplastic resin, and has flowability and moldability. In addition, the styrene-ethylene-butylene-styrene block copolymer can improve the elasticity and tensile strength of the filter plate of the present embodiment.

In this embodiment, styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene block copolymer (SB), styrene-isoprene-butadiene-styrene block copolymer (SIBS), styrene-ethylene-butadiene block copolymer ( Polystyrene-based thermoplastic elastomers such as SEB), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-butadiene-butylene-styrene block copolymer (SBBS), styrene-ethylene-ethylene-propylene-styrene (SEEPS) Among them, by selectively using a styrene-ethylene-butylene-styrene block copolymer (SEBS), it is possible to form a membrane filter plate for filter presses having a low thickness and excellent durability and mechanical properties.

The resin composition of this embodiment comprises 3 to 10% by weight, preferably 4 to 8% by weight, more preferably 6 to 7% by weight of styrene-ethylene-butylene-styrene block copolymer based on the total weight of the resin composition. can do.

If the styrene-ethylene-butylene-styrene block copolymer is included in less than 3% by weight based on the total weight of the resin composition of this embodiment, the durability and mechanical properties of the filter plate of this embodiment may not be sufficient. There may be a problem with this. On the other hand, when the styrene-ethylene-butylene-styrene block copolymer is included in an amount of more than 10% by weight based on the total weight of the resin composition of the present embodiment, the present embodiment is performed by the flowability of the styrene-ethylene-butylene-styrene block copolymer. Examples may have a problem in that the durability and mechanical properties of the filter plate is lowered and bleaching occurs.

Poly propylene is a resin obtained by polymerizing propylene, and is a thermoplastic resin that has flowability and formability when exposed to heat or shear force, and becomes rigid again when cooled. In this embodiment, the durability of the filter plate can be further improved by using polypropylene having a polymerization degree of about 600 to 800, preferably 650 to 750, more preferably 680 to 700. If the degree of polymerization of the polypropylene in this embodiment exceeds 600 ~ 800, the durability of the filter plate may not be sufficiently improved.

The resin composition of the present embodiment may include 60 to 80% by weight, preferably 67 to 74% by weight, more preferably 72 to 73% by weight, based on the total weight of the resin composition.

If the polypropylene is less than 60% by weight based on the total weight of the resin composition of this embodiment, the durability and mechanical properties of the filter plate of this embodiment may not be sufficient, and there may be a problem of whitening. On the other hand, when the polypropylene is contained in an amount of more than 80% by weight based on the total weight of the resin composition of the present embodiment, the flowability and formability of the polypropylene are increased by the heat generated during the dewatering of the sludge. There may be a problem that the durability and mechanical properties are significantly lowered, bleaching may occur.

In this embodiment, the styrene-ethylene-butylene-styrene block copolymer and polypropylene are 1: 8 to 19 weight ratio, preferably 1: 8.5 to 13 weight ratio, more preferably 1:11 to 12.5 weight ratio, most preferably May include 1:12. Particularly, in the present embodiment, by including the styrene-ethylene-butylene-styrene block copolymer and the polypropylene in a weight ratio of 1: 8 to 19, the filter plate of the present embodiment is not only thinner but also more durable, and serves as a filter plate. It may have suitable mechanical properties such as tensile strength and elongation.

Fillers to improve the durability and mechanical properties of the filter plate of the present embodiment, all kinds of known fillers can be applied without limitation. In this embodiment, barium sulfate as a filler (Barium sulfate), MgO (Magnesium oxide), calcium carbonate (Calcium carbonate), titanium dioxide (Titanium dioxide), zinc oxide (Zinc oxide), alumina (Alumina), silica (Silica) And one or more selected from the group consisting of Mica, Talc, Clay, Bentonite , Zeolite, Glass fiber and Carbon black. It may be, but is not limited thereto.

The resin composition of the present embodiment may include 2 to 7% by weight, more preferably 2.5 to 5% by weight, more preferably 3 to 4% by weight of the filler based on the total weight of the resin composition.

If the resin composition of the present embodiment contains less than 2% by weight of a filler based on the total weight of the resin composition, durability and mechanical properties of the present embodiment may not be sufficiently improved. On the other hand, when the resin composition of the present example includes more than 7% by weight of the filler based on the total weight of the resin composition, the tissue of the styrene-ethylene-butylene-styrene block copolymer and polypropylene may not be tightly bonded. have. That is, the internal structure of the filter plate is not dense, there may be a problem that the durability and mechanical properties are reduced.

In particular, the filler of this embodiment contains calcium carbonate, bentonite and zeolite in a weight ratio of 1: 0.1-2: 0.1-2, preferably 1: 0.5-1.7: 0.5-1.7, more preferably 1: 0.5-1: 1. It may comprise 1.5 weight ratio, most preferably 1: 0.7: 1 weight ratio. In particular, it may be desirable to add a small amount of bentonite relative to calcium carbonate and zeolite in the filler. Accordingly, the filter plate of the present embodiment may be thin and have durability and mechanical properties, and may have little whitening phenomenon.

An organic peroxide is for improving the fluidity | liquidity and moldability of the resin composition of a present Example. For example, t-amyl peroxybenzoate, t-butyl hydroperoxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, t-butylperoxy isopropyl carbonate, diacetyl peroxide, Dibenzoyl peroxide, dicyclo hexane, dibutyl peroxyldicarbonate, trimethylcyclohexane, diedecanoyl peroxide, and peroxyldicarbonate, but may include one or more selected from The application of all known organic peroxides is possible.

In the present embodiment, in order to form a filter plate having a thin thickness and excellent durability and mechanical properties, an additive including one or more selected from the group consisting of an antifoaming agent, a pigment, an antioxidant, and a light stabilizer may be further included.

The antifoaming agent may include one or more selected from the group consisting of silicon-based compounds, non-silicone-based compounds, fatty acid-based compounds, and fluorine-based compounds, but is not limited thereto.

The pigment may include one or more selected from the group consisting of titanium oxide, zinc oxide, zinc sulfide, lead white, zinc sulfate, barium sulfate, calcium carbonate and alumina, but is not limited thereto.

Antioxidants include 2,4,6-tri-t-butylphenol, 2,6-di-t-butyl-4-n-butylphenol, 2,6-di-t-butyl-4-methylphenol or n Octadecyl 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, pentaerythritol tetrakis [3- (3,5-di-t-butyl-4-hydroxy Phenyl) propionate], di-n-octadecyl (3,5-di-t-butyl-4-hydroxybenzyl) phosphonate, 2,4,6-tris (3,5-di-t- Butyl-4-hydroxybenzyl) mesitylene, tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate or hindered piperidine carboxylic acid, 2,6-dihydroxy-9 Acylated derivatives of azabicyclo [3.3.1] nonane or bicyclic hindered amines or diphenylamines or dinaphthylamines, phenylnaphthyl amines, N, N'-diphenylphenylenediamines or p-octyldi Phenylamine, p, p-dioctyl diphenylamine, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, N- (p-dodecyl) phenyl-2-naphthyl amine, di -1-naphthylamine, di-2-na Tylamine, N-alkyl phenothiazine, imino (bisbenzyl), 6- (t-butyl) phenol, 2,6-di- (t-butyl) phenol, 4-methyl-2,6-di- ( t-butyl) phenol, 4,4'-methylenebis (2,6-di- (t-butyl) phenol), methyl hydroxy hydrocinnamamide, phenothiazine derivatives, alkylated 5-amino tetrazole It may include, but is not limited to, di-t-butyl p-amino phenol, lecithin, ascorbic acid, delta-tocopherol, rosemary extract, oat extract, soybean extract and green tea extract.

The light stabilizer is effective in preventing aging and color change caused by exposure to light for a long time, and is a component that can perform UV blocking, light energy absorption and conversion, and free radical removal. The light stabilizer may include one or more selected from the group consisting of UV absorbers and UV hindered amine light stabilizers.

The ultraviolet light-based light stabilizer may include a benzophenone-based, oxanilide-based, benzotriazole-based, triazine-based, etc., 4-benzoyloxy-2,2,6,6-tetramethyl as the organic amine light stabilizer Biferridine, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-hydroxybenzoide and the like.

In particular, in the present embodiment, when the antifoaming agent, antioxidant and light stabilizer are included, the filter plate of the present embodiment may have excellent durability and mechanical properties.

1 is a perspective view of a membrane filter plate for a filter press according to an embodiment of the present invention, Figure 2 is a view showing a real picture of the membrane filter plate for a filter press shown in FIG.

1 and 2, the membrane filter plate 1 for a filter press formed using the resin composition of the present embodiment may be formed in the shape of a plate 10, and a plurality of protrusions 20 may be formed on one surface thereof. The filtrate passing through the filter cloth in the process of dewatering the slurry using the filter press including the filter plate of FIGS. 1 and 2 may be discharged to the outside of the filter plate while flowing through the space formed by the plurality of protrusions.

FIG. 3 is a view illustrating a part of a filter press to which the membrane filter plate for the filter press of FIG. 1 is applied.

3, the filter press may include a frame in a frame shape, a filter plate inserted into the frame, and a filter cloth (not shown) surrounding the frame and the filter plate. In addition, the filter press, in addition to the filter unit including the filter plate of the present embodiment, pressurizing unit (not shown) to apply pressure to the filter unit to be in close contact with each other so that the sludge is dewatered, supply the sludge to the filter unit It may further include a supply unit (not shown) and the like, and may further include any configuration for forming or operating the filter press.

Hereinafter, the membrane filter plate for filter presses having improved durability and mechanical properties of the present invention will be described in detail through Examples, Comparative Examples, and Experimental Examples. These examples are only for illustrating the present invention, and the scope of the present invention is not to be construed as being limited by these examples.

Example

Example  1 to 5

To prepare a membrane filter plate for a filter press by preparing a resin composition of the composition disclosed in Table 1 (unit: wt%), and then injection in the form shown in FIG. In this case, as a filler, calcium carbonate, bentonite and zeolite were mixed in a weight ratio of 1: 0.7: 1, and as the organic peroxide, diacetyl peroxide and t-butyl hydroperoxide were mixed in a weight ratio of 1: 2. Was used.

In addition, polypropylene (PP) was used to have a polymerization degree of 680, and a small amount of antifoaming agent, antioxidant, and light stabilizer was added in addition to SEBS, PP, filler, and organic peroxide.

Example One 2 3 4 5 SEBS 10.0 4.0 6.0 8.0 3.0 PP 68.0 74.0 72.0 70.0 75.0 Filler 3.0 3.0 3.0 3.0 3.0 Organic peroxide To.100

Example  6

Except for using only calcium carbonate as a filler was prepared in the same manner as in Example 1.

Example  7

A filler was prepared in the same manner as in Example 1, except that calcium carbonate, bentonite, and zeolite were mixed in a weight ratio of 1: 1.

Example  8

A filler was prepared in the same manner as in Example 1, except that calcium carbonate, bentonite, and zeolite were mixed in a weight ratio of 1: 1.5: 1.

Comparative example

Comparative example  One

A membrane filter plate for a conventional filter press was prepared.

Comparative example  2 to 7

It was prepared in the same manner as in Example 1 except for following the composition in Table 2.

Comparative example 2 3 4 5 6 7 SEBS 1.0 15.0 1.0 1.0 1.0 1.0 PP 68.0 68.0 55.0 85.0 68.0 68.0 Filler 3.0 3.0 3.0 3.0 1.0 10.0 Organic peroxide To.100

Comparative example  8 to 11

Except for using the polystyrene-based elastomer of Table 3 in place of SEBS was prepared in the same manner as in Example 1.

Polystyrene Elastomer Comparative example  8 Styrene-Butadiene-Styrene Block Copolymer (SBS) Comparative example  9 Styrene-isoprene-butadiene-styrene block copolymer (SIBS) Comparative example  10 Styrene-ethylene-propylene-styrene block copolymer (SEPS) Comparative example  11 Styrene-butadiene-butylene-styrene block copolymer (SBBS)

Comparative example  12

It was prepared in the same manner as in Example 1 except that only polypropylene (85 wt%) was used without using SEBS.

Experimental Example

Experimental Example  1: thickness evaluation

(1) thickness measurement

The thickness (± 0.05) 4 of the membrane filter plate for filter presses prepared according to Examples 1 to 5 and the filter plate of Comparative Example 1 was measured and disclosed in Table 4.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Thickness (mm) 3.2 mm 3.2 mm 3.0 mm 3.1 mm 3.2 mm 4.0 mm

Looking at Table 4, it can be seen that the thickness of Examples 1 to 5 is about 3.0 to 3.2 mm, the thickness is thinner than Comparative Example 1.

(2) visual evaluation of thickness

In addition, the cross-section of the filter plate according to Example 1 and Comparative Example 1 is shown in Figure 4 to compare the thickness of Example 1 and Comparative Example 1.

4, it can be visually confirmed that the thickness of Example 1 is even thinner than that of Comparative Example 1.

Experimental Example  2: durability evaluation

(One) Of filter plate  Durability assessment through tension and shrinkage

After fixing both sides of the filter plate according to the Examples and Comparative Examples, by applying a constant force (the same force, the same moving speed) to the center of the filter plate to move in the vertical direction (stroke: 70 mm), the filter plate is pulled up and down Contraction. At this time, the filter plates of Examples 1 to 8 and Comparative Examples 2 to 12 were 3 ± 0.2 mm in thickness, and Comparative Example 1 was 4 ± 0.2 mm in thickness (see Experimental Example 1).

At this time, after moving upward, moving downward and returning to the original position again as a single motion, after a total of 100,000 repeated movements, the state of the filter plate was visually observed, and the results are shown in Tables 5 and 6 below. It was. The 100,000 repeated cycles represents the number of times the filter press is run for 20 years, assuming that the filter press is running 20 hours per day (about 13 tensions / shrinkage).

According to the degree of whitening phenomenon, (circle): whitening phenomenon is severe, (triangle | delta): there exists whitening phenomenon, and X: almost no whitening phenomenon.

Example 1 Example 2 Example 3 Example 4 Whitening phenomenon X X X X Example 5 Example  6 Example  7 Example  8 Whitening phenomenon X ○ △ △

Comparative example  One Comparative example  2 Comparative example  3 Comparative example  4 Comparative example  5 Comparative example  6 Whitening phenomenon ○ ○ ○ ○ ○ ○ Comparative example  7 Comparative example  8 Comparative example  9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Whitening phenomenon ○ ○ ○ △ ○ ○

Looking at Tables 5 and 6, it can be seen that the whitening phenomenon is distinct in the filter plate of the comparative example compared to the Example.

(2) Filter plate  Compare photos

5 to 15 show filter plates of Examples 1, 3, 6, and 7 and Comparative Examples 1 to 7, which were repeatedly stretched and contracted 100,000 times according to (1).

Figure 5 shows the filter plate of Example 1, Figure 6 shows the filter plate of Example 3, according to the (1) it is shown that even if repeated 100,000 times the tension and shrinkage does not occur whitening phenomenon and damage You can check it.

7 is Example 6 using only calcium carbonate as a filler, it can be seen that the whitening phenomenon occurs when repeating the tension and shrinkage 100,000 times according to (1). In addition, FIG. 8 is a seventh embodiment in which calcium carbonate, bentonite, and zeolite are mixed in a weight ratio of 1: 1: 1 as a filler, and the whitening phenomenon is weak when 100,000 tension and shrinkage are repeated according to (1). It can be confirmed that it occurred. That is, referring to Figures 5 to 8, including calcium carbonate, bentonite and zeolite as a filler, when it is included in a weight ratio of 1: 0.7: 1, it can be seen that there is almost no whitening phenomenon.

9 to 14 show the resin composition content (3 to 10% by weight of styrene-ethylene-butylene-styrene block copolymer, 60 to 80% by weight of polypropylene, 2 to 7% by weight of filler and residual organic peroxide) of this embodiment. In Comparative Examples 2 to 7, which do not follow, whitening phenomenon can be confirmed. That is, according to Figures 5, 6 and 9 to 14, according to the composition ratio of the present embodiment it can be seen that almost no whitening phenomenon.

15 shows a conventional filter plate according to Comparative Example 1, and it can be confirmed that bleaching has occurred.

Experimental Example  3: Mechanical property evaluation

The mechanical properties of the Examples and Comparative Examples were evaluated, and the results are shown in Tables 8 to 10, and the mechanical properties were evaluated according to the test method of Table 7.

Test Items Test method Test Items Test method The tensile strength ASTM D638 Flexural strength ASTM D790 Yield Elongation ASTM D638 Flexural modulus ASTM D790 Elongation at Break ASTM D638 Impact strength ASTM D256 Tensile Modulus ASTM D638 Hardness ASTM D2240

Example One 2 3 4 5 6 7 8 Tensile Strength (Mpa) 25.8 27.9 30.9 28.1 25.1 21.2 24.7 23.1 Yield Rate (%) 24.7 25.1 27 25.8 24.1 21.9 23.6 23.1 Elongation at Break (%) 615 620 627 621 609 590 609 604 Tensile Modulus (Mpa) 468 489 539 500 439 382 423 400 Flexural Strength (Mpa) 21.9 21.4 23.0 22.8 21.1 21.8 22.0 21.7 Flexural modulus (Mpa) 712 714 721 715 711 709 715 711 Impact strength (J / m) 603 638 699 650 589 480 531 500 Hardness 65 64 65 63 63 65 63 66

Comparative example One 2 3 4 5 6 7 Tensile Strength (Mpa) 20.7 14.7 16.8 15.0 17.4 13.4 14.1 Yield Rate (%) 21 14.1 16.5 14.4 17.1 12.8 13.4 Elongation at Break (%) 595 448 471 459 495 402 426 Tensile Modulus (Mpa) 371 321 356 324 361 281 303 Flexural Strength (Mpa) 22.2 17.7 19.2 17.8 19.5 16.1 17.4 Flexural modulus (Mpa) 715 587 620 594 644 607 555 Impact strength (J / m) 448 234 347 261 409 159 184 Hardness 65 62 65 63 66 65 64

Comparative example 8 9 10 11 12 Tensile Strength (Mpa) 20.1 19.0 19.4 18.7 11.8 Yield Rate (%) 20.8 21.0 19.8 19.1 10.1 Elongation at Break (%) 584 566 574 580 324 Tensile Modulus (Mpa) 368 334 358 361 265 Flexural Strength (Mpa) 21.1 18.9 19.4 20.7 14.6 Flexural modulus (Mpa) 685 650 660 674 528 Impact strength (J / m) 608 554 581 594 143 Hardness 64 63 65 65 60

Looking at the Tables 8 to 10, it can be confirmed that the tensile strength, yield elongation, elongation at break, tensile modulus, flexural strength, flexural modulus, impact strength of the Example compared to the comparative example, the comparative example of the filter plate according to the embodiment It can be seen that the mechanical properties are better than the filter plate according to.

That is, by combining the results of Experimental Examples 1 to 3, it can be seen that the filter plate formed using the resin composition of the present embodiment has excellent durability and mechanical properties while having a thin thickness.

As described above, the description of the present invention is for the purpose of illustration, and those skilled in the art to which the present invention belongs may easily change to other specific forms without changing the technical spirit or essential features of the present invention. I can understand. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1: membrane filter plate for filter press
10: board
20: turning

Claims (6)

In the membrane filter plate for filter presses with improved durability and mechanical properties,
The membrane filter plate for the filter press is formed using a resin composition comprising a styrene-ethylene-butylene-styrene block copolymer, a polypropylene, a filler, and an organic peroxide. Be,
The resin composition is
3 to 6% by weight of styrene-ethylene-butylene-styrene block copolymer, 60 to 72% by weight of polypropylene, 2 to 7% by weight of filler and residual amount of organic peroxide based on the total weight of the resin composition,
The filler
A membrane filter plate for a filter press, comprising calcium carbonate, bentonite, and zeolite in a weight ratio of 1: 0.7: 1.
The method of claim 1,
The resin composition is
Membrane filter plate for a filter press, comprising the styrene-ethylene-butylene-styrene block copolymer and the polypropylene in a weight ratio of 1: 8 to 19.
delete delete The method of claim 1,
The organic peroxide is
t-amyl peroxybenzoate, t-butyl hydroperoxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, t-butylperoxy isopropyl carbonate, diacetyl peroxide, dibenzoyl peroxide Membrane filter plate for filter presses, comprising at least one selected from the group consisting of dicyclo hexane, dibutyl peroxyldicarbonate, trimethylcyclohexane, diedecanoyl peroxide and peroxyldicarbonate .
The method of claim 1,
The resin composition is
Membrane filter plate for a filter press, further comprising an additive comprising at least one selected from the group consisting of an antifoaming agent, a pigment, an antioxidant, and an optical stabilizer.

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