KR101207895B1 - Bio-degradable plastic drain board and method of manufacturing the same - Google Patents

Abstract

PURPOSE: An environmentally-friendly biodegradable drain board and a manufacturing method thereof are provided to reduce secondary contamination caused by exhausted pore water. CONSTITUTION: An environmentally-friendly biodegradable drain board(100) comprises a core(110a) and a fiber filter(120). The core is manufactured using a naturally degradable resin and has multiple drainage spaces(114) for draining pore water. The filter is manufactured using a naturally degradable resin and covers the core. A reactant is spread on the outer surface of the filter to prevent contaminants filtered from the pore water from being drained to the ground.

Description

Eco-degradable plastic drain board and method of manufacturing the same

The present invention relates to an eco-friendly biodegradable drainage material and a method for manufacturing the same, wherein the biodegradation is made after drainage of the pore water during the improvement of the soft ground, and the eco-friendly biodegradation to filter the pollutants in the ground during the drainage through the filter coated with the reactants. It relates to a sex drainage material and a method of manufacturing the same.

In order to build various buildings or structures such as houses, factories, roads, and embankments on soft grounds such as reclaimed land, reclaimed land, lakes, swamps, etc., the contents of soft ground are discharged to the ground to stabilize the soft ground and reinforce strength. Must be preceded.

To this end, the water contained in the soft ground is discharged to the outside using the PBD (Plastic Board Drain) method.

The PBD method is to press-install the plastic board drain in the soft ground to discharge the water contained in the soft ground to the ground surface through the PBD installed vertically and horizontally.

The PBD includes a core having a plurality of drainage paths formed therein to drain moisture, and a fibrous filter configured to surround the core to prevent foreign substances from flowing into the core.

Conventional PBDs use polypropylene and polyester as the main raw materials and polypropylene and polyethylene as cores.

On the other hand, construction materials for temporary construction, except for construction materials used for permanent structures are to be separated and recycled or collected after the required purpose is to follow a predetermined waste treatment process.

PBD used in the vertical drainage method is a construction material used for the purpose of increasing the strength of the ground for the construction of permanent structures. After use, it must be collected and disposed of in full to prevent environmental pollution.

The reason is that it is installed at very narrow intervals, which blocks the natural movement of groundwater and hinders the coming and going of underground organisms, so there is a high risk of long-term dead land, but collecting all the PBDs that have been placed 20 to 70 meters below the surface. In order to increase the construction cost due to the development of special equipment for drawing type PBDs and skilled manpower, as well as the increase in related costs such as extended construction period and processing cost, construction cost is not only increased but also practically impossible in construction. .

Therefore, it is very necessary to develop a drain board that is self-decomposing and friendly to the soil, saving cost and time, rather than collecting and processing semi-permanent PBDs in the soil.

In addition, there is a problem of causing secondary pollution when the pollutant in the ground is discharged together with the pore water and discharged without additional treatment.

In order to solve this problem, the core is made of coconut, the filter is made of jute, or the core is made of rice straw, and the filter is made of soft ground improvement method by using the natural water made of jute. Due to the very low durability of the drainage is not secured smoothly, there is a problem that the drainage performance is very low, and the water permeability and filtration efficiency of the filter is low, the performance can not be exhibited as a drainage.

In addition, in the construction of such a natural drainage, there is a problem that the construction efficiency is very low because it can not be pressed into the ground using the existing equipment.

An object of the present invention for solving the above problems is to configure the core and filter of the drainage material to be biodegradable when the soft ground is improved so as to prevent the disturbance and pollution of the underground ecosystem by biodegradation in the ground after the drainage of the pore water, The present invention provides an eco-friendly biodegradable drainage material and a method of manufacturing the same, which removes heavy metals and organic contaminants in the pore water by the decontamination material applied to the pore water and reduces the occurrence of secondary pollution by the discharged pore water. Is in.

The present invention, which achieves the above object and performs the problem for eliminating the conventional defects, is a drainage material which is installed in the ground to drain the gap water at the time of soft ground improvement, and is formed of a naturally degradable resin and is formed in the ground water of the ground. Core to drain the; A fibrous filter formed of a biodegradable resin and installed to surround the core, and having a surface of a reactant applied thereon to filter contaminants of the pore water by the applied reactant, wherein the reactant is zero valent iron. Or zeolite.

In addition, the reactant is characterized in that it further comprises a switch Korea to prevent the effective surface area of the reactant is reduced due to the increase in the basicity due to the hydroxyl group (OH) generated during the adsorption reaction of the pollutant.

In addition, the biodegradable resin forming the core or filter, including 70 to 130 parts by weight of dicarboxylic acid and 5 to 15 parts by weight of polyorganosiloxane with respect to 100 parts by weight of cyclodextrin, an oligosaccharide having a cyclic structure and having a cavity in the center, Characterized in that configured.

In addition, the biodegradable resin forming the core, characterized in that it further comprises 10 to 20 parts by weight of the inorganic filler with respect to 100 parts by weight of the cyclodextrin oligosaccharide to increase the strength of the core.

In addition, the biodegradable resin forming the core or filter, 1 to 10 weight of PBAT (Polybutylene adipate-co-terephthalate) of petroleum biodegradable resin based on 100 parts by weight of PLA (polylactide) extracted from corn starch Characterized in that it comprises a part.

In addition, in the biodegradable resin to form the core, it characterized in that it further comprises 10 to 20 parts by weight of inorganic filler with respect to 100 parts by weight of PLA.

In addition, the inorganic filler is characterized in that any one or more of hydroxyapatite, calcium carbonate (CaCO ₃ ), talc (Talc).

The core may further include: a plurality of perforated pipes arranged at predetermined intervals and having a plurality of perforation holes to form a drainage space; And a connecting member connecting the hole pipes and formed in a + shape to form a drainage space between the filters.

In addition, the core is characterized in that a plurality of perforation holes are formed in a tubular shape in which a spiral is formed on the outer circumference.

Meanwhile, the present invention provides a method for preparing a core using a biodegradable resin; Preparing a filter using a biodegradable resin; Applying a reactant made of ductile iron or zeolite to the surface of the filter; It is characterized in that it comprises a; surrounding the core with a filter coated with the reactant, and bonding the overlapping portion, so that both ends of the filter overlap.

In addition, the biodegradable resin is a polyorganosiloxane after mixing 70 to 130 parts by weight of dicarboxylic acid with respect to 100 parts by weight of cyclodextrin, which is an oligosaccharide having a cyclic structure and a cavity in the middle, and then heating under an acid catalyst to induce an esterification reaction. It is characterized in that it is prepared by further heating to lower the pressure by adding 5 to 15 parts by weight.

In addition, the biodegradable resin is prepared by mixing 1 to 10 parts by weight of polybutylene adipate-co-terephthalate (PBAT) based on petroleum biodegradable resin based on 100 parts by weight of PLA (polylactide) extracted from corn starch. It features.

As described above, according to the present invention, it is naturally decomposed in the ground after the drainage of the pore water based on the material of the drainage to prevent the disturbance and contamination of the underground ecosystem, and by removing the heavy metals through adsorption and the like by the reactants applied to the filter. It is a very useful invention that removes soil pollutants and prevents secondary pollution by pore water discharged to the ground.

1 is a perspective view showing a drain material according to an embodiment of the present invention,
2 is a perspective view showing a core according to an embodiment of the present invention;
3 is a cross-sectional view showing a drain material according to an embodiment of the present invention,
Figure 4 is an exemplary view showing a hole forming state of the core according to an embodiment of the present invention,
5 is a perspective view showing a drain material according to another embodiment of the present invention,
6 is a perspective view showing a drain material according to another embodiment of the present invention,
7 is an exemplary view showing a bonding state of a filter according to an embodiment of the present invention;
8 is an exemplary view showing a state in which a reactant is attached to a filter of the present invention;

Hereinafter, the configuration and the operation of the 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.

1 is a perspective view showing a drain material according to an embodiment of the present invention, Figure 2 is a perspective view showing a core according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing a drain material according to an embodiment of the present invention, Figure 4 Is an exemplary view showing a state of forming a punched hole of the core according to an embodiment of the present invention,

The drainage material 100 of the present invention is made of a naturally degradable resin to drain the gap water in the ground, and is made of a naturally degradable resin and is installed to surround the core (110a) and made of zero valent iron or zeolite outside Reactant 121 is applied to include a fibrous filter 120 to filter the contaminants of the pore water so that the contaminants are not drained to the ground.

The core 110a should be sufficiently resistant to earth pressure, sufficient water supply capacity should be secured to facilitate drainage of the pore water, and is preferably used as an elastic material.

The core 110a may be formed in a plate shape, and in more detail, a plurality of perforation holes may be formed at a side surface of the core 110a to form a drainage space 114 for drainage of the gap water and to allow the gap water to flow into the drainage space 114. The connecting member 112 connects the plurality of hole holes 111 having the 113 and the hole holes 111 formed therein, and has a cross section formed in a + shape so that the drainage space 114 is formed between the filter holes 120. It is configured to include.

The cross section of the perforated tube 111 can be manufactured in a circular or polygonal form, and usually produces a perforated tube 111 of a circular cross section.

The perforation hole 113 formed in the perforated pipe 111 forms an oblique line 130 on one side with a plurality of neighboring perforated pipes 111, and an oblique line 130 formed on one side on the other side facing the one side. It is configured to increase the bending rigidity of the core (110a) and have a strong resistance to mutual deformation by machining to cross the X-shape so as not to face on the same axis) to have a diagonal line 130 in the opposite direction.

As described above, the core 110a of the present invention includes the air hole 111 so that the drainage space 114 is not deformed due to earth pressure, so that smooth drainage is achieved.

On the other hand, Figure 5 is an exemplary view showing a drain material according to another embodiment of the present invention, a core (110b) made of a natural decomposable resin to drain the gap water in the ground, and made of a naturally degradable resin wrapped around the core (110b) It is installed so that the reaction material 121 containing a noble iron and zeolite is applied to the outside is made of a fibrous filter 120 to filter the pollutants of the pore water so that the pollutants are not drained to the ground, the core (110b) The plate body 117 and ribs 118 are formed perpendicular to both sides of the plate body 117 to create a drainage space is configured.

Figure 6 is a perspective view showing a drain material according to another embodiment of the present invention, the core according to another embodiment is formed in a cylindrical shape, the tubular shape in which the spiral 115 is formed on the outer periphery, a plurality of holes The 113 is formed so that the strength of the spiral 115 is reinforced, and the boring hole 113 is configured to allow the gap water to be discharged into the core 110c. In addition, as the spiral 115 is formed on the inner circumference of the core 110c, the spiral groove 116 is configured to form a vortex in the injection material and contaminants flowing therein, thereby allowing the void water to flow into or out of the filter 120. It is reasonable to allow for easy flow.

Meanwhile, the filter 120 blocks soil particles that may enter the cores 110a, 110b, and 110c from the contaminated soil, and provides a nonwoven fabric having a structure in which an injection material and a contaminant can pass through the filter 120. It is reasonable to use. As the material of the filter 120, the nonwoven fabric is preferably used by adjusting the particle diameter of the nonwoven fabric according to the particle size distribution of the soil in order to prevent clogging.

The cores 110a, 110b, 110c and the filter 120, which are configured as described above, are composed of a natural decomposable resin, so that the natural decomposition occurs at the time when the drainage material 100 is buried in contaminated soil. To prevent disruption or contamination of underground ecosystems.

Here, the naturally-decomposable resin includes 70 to 10 parts by weight of dicarboxylic acid and 5 to 15 parts by weight of polyorganosiloxane based on 100 parts by weight of cyclodextrin, which is an oligosaccharide having a cyclic structure and having a cavity in the middle thereof.

In addition, the biodegradable resin is polybutylene adipate-co-terephthalate of petroleum-based biodegradable resin to increase mechanical properties and durability with respect to 100 parts by weight of polylactide extracted from corn starch ((polylactide), referred to as "PLA") Hereinafter referred to as "PBAT" comprising 1 to 10 parts by weight.

The drainage material 100 composed of such a naturally degradable resin has a weight of 70 g / m or more per unit length, a maximum tensile strength of 200 kg / width or more, and a tensile strength of 100 kg / width or more at 10% tensile, and does not cause cracks when bending 180 degrees. It is desirable to design to have a drainage resistance of 25cm ³ / sec or more when flexural resistance and straight line at 300kPa, 15cm ³ / sec or more when 20% bending. The biodegradability is effective at 60% or higher after the end of the test under aerobic aqueous conditions according to ISO 14852.

The cyclodextrin is a white or crystalline powder that is decomposed at 278 ° C., and is relatively heat resistant. Glucose is cyclically bonded, has a strong heat resistance against acids and alkalis, and is extremely resistant to heating and humidity. These properties provide excellent durability, thermal stability and absorption in any use environment as a drain.

Meanwhile, 10 to 20 parts by weight of inorganic fillers are further included in the naturally degradable resin forming the cores 110a, 110b and 110c to increase the strength and durability of the cores 110a, 110b and 110c. It is characterized by.

In addition, the inorganic filler is characterized in that any one or more of hydroxyapatite (hydroxyapatite), calcium carbonate (CaCO ₃ ), talc (Talc).

The inorganic filler as described above remains in the contaminated ground even after decomposition of the cores 110a, 110b, and 110c as a natural material and does not become a source of contamination.

When the content of the inorganic filler is higher than 20 parts by weight, the hardening of the cores 110a, 110b, and 110c is severe, which makes it difficult to form the cores 110a, 110b and 110c. It is preferable to set it as 10-20 weight part with respect to the.

Meanwhile, in the present invention, the reactant 121 is applied to the filter 120 to remove contaminants primarily based on the reactant 121. The reactant includes zero valent iron and zeolite, and thus, the coating material is further included to apply a s Korea to increase the basicity due to the hydroxyl group (OH) generated during the adsorption reaction between the reactant and the pollutant, thereby reducing the effective surface area of the reactant. prevent.

The reactant 121 is to remove the contaminant through a reaction process specific to the contaminant contained in the groundwater. These reactants 121 should have sufficient reactivity to the target pollutants, should be inexpensive, and have a large amount and sustained in the pollutant removal reaction for a certain period of time.

In the present invention, the drainage is installed in the ground where contaminants are present to induce a hydraulic flow of the groundwater contaminant, to induce a chemical reaction between the reactants 121 and the contaminants to remove the contaminants primarily. To this end, the present invention is applied to the filter 120 by applying the zero valent iron and zeolite as a reactant to remove the chloride organic compounds by increasing the desalination efficiency by the zero valent iron, removal of heavy metals and nutrients by the zeolite 1 Secondly, to clean the contaminated soil.

The zero-valent iron (ZVI) is mainly used as a reaction medium for the restoration of soil and groundwater contaminated with organic pollutants, and research on this is steadily progressing. Zero iron is widely used because of its high efficiency in removing and reacting with contaminants and its relatively low cost compared to other media.

The reaction mechanism of zero valent iron causes oxidation of zero valent iron to form a redox couple. This pattern shows that zero-valent iron tends to lose electrons and exist in cation form as shown in the equation below and can be considered as a corrosion reaction caused by spontaneous oxidation.

In addition, in the case of halogenated alkyl (RX) such as PCE and TCE, reductive dechlorination proceeds in the presence of an H + donor by a reaction as shown below.

On the other hand, zeolite is known to remove nutrients such as ammonia nitrogen and heavy metals such as cadmium, lead, copper, and zinc from contaminants by ion exchange. Here, cation exchange refers to a phenomenon in which a cation present in a liquid phase is exchanged with a cation of the same charge which is electrostatically attracted to a solid surface. If B is the exchange reaction can be expressed as below.

This exchange reaction enables the separation and removal of specific ions. The ion exchange reaction is stoichiometric and can be regenerated because it does not affect the basic structure of the solid being exchanged.

On the other hand, impurities are deposited in iron powder due to the increase of pH in the process of removing contaminants caused by zero-valent iron, and when the pH is increased, metal hydroxides are deposited on the iron surface as a reactant. The reductive dechlorination process with zero valent iron is very sensitive to pH because passivation occurs which reduces the effective surface area. When zero-valent iron is used as a reactant, by dissociating groundwater, hydroxyl radicals (OH) are continuously released to increase pH. Therefore, in the present invention, by adding scoria in addition to the noble iron and zeolite to the reactant 121, the effective surface area decrease due to the pH rise is prevented.

Scoria is a type of volcanic products. In Jeju Island, there are many Koreans called volcanic eruptions, also called Song. Jeju Island on Jeju Island is a volcanic rock material that contains volcanic rock, volcanic sand and other volcanic ashes. About 75% of the components of S Korea are silicon oxide (SiO₂), aluminum oxide (Al₂O₃) and iron oxide (Fe₂O₃), and calcium oxide (CaO), magnesium oxide (MgO), potassium oxide (K₂O) and sodium oxide ( Na₂O) and nickel oxide (TiO₂). The shape of the sea Korea is porous and its specific surface area is about 100m₂ / g, which is relatively large, providing a good environment for microorganisms to grow. In addition, S Korea has physical and chemical and biological stability, high mechanical strength and durability, there is an economic advantage that can be used to collect natural materials. In this way, in the present invention, by adding SKO to the reactant 121, the effective surface area of the noble iron is prevented from decreasing due to the increase in pH, thereby preventing the removal efficiency of the chlorinated organic compound of the noble iron from being lowered. In addition, due to the porosity of Korea, other organic substances can be adsorbed. In other words, S Korea will be able to increase the efficiency of removing pollutants by adsorbing organic materials and at the same time as a supplementary role to prevent efficiency deterioration of zero-valent iron.

In addition, SKOREA is characterized by suppressing the increase in pH due to the reaction of zero valent iron in a titration line with a pH of about 6 to 7. That is in the action of the zeolite when such heavy metals of Cd ^{2 +} because it appears the low adsorption rate in the low pH other when an excessively by the use of a neutralizing agent lowering the pH rather it inhibits the action of the zeolite by the addition of scoria reaction of zero-valent iron This is to prevent the increase in pH by the titration line so as not to disturb the action of the zeolite.

On the other hand Figure 7 is an exemplary view showing a bonding state of the filter according to an embodiment of the present invention, Figure 8 is an exemplary view showing a state in which a contaminant adsorbent is attached to the filter according to an embodiment of the present invention,

First of all, a step of synthesizing a naturally degradable resin is obtained by mixing 70 to 130 parts by weight of dicarboxylic acid with respect to 100 parts by weight of cyclodextrin, an oligosaccharide having a cyclic structure and having a central cavity, and then heating under an acid catalyst to induce an esterification reaction. And 10 parts by weight of PBAT of petroleum-based biodegradable resin series to increase mechanical properties and durability to polylactic acid (hereinafter referred to as "PLA") extracted from a resin composed of 5 to 15 parts by weight of polyorganosiloxane or corn starch. It further comprises 10 to 20 parts by weight of an inorganic filler made of any one or more of hydroxyapatite, calcium carbonate, and talc in the resin contained therein, and then heated to lower pressure to produce a naturally degradable resin.

Next, using the naturally-degradable resin obtained in the step of producing a core (110a) (110b) (110c) and a filter, the step of applying a reactant comprising a non-ferrous iron or zeolite to the filter, and It comprises a step of wrapping and bonding the core (110a) (110b) (110c) with a filter 120 coated with a reactant.

The reactant 121 of the present invention formed as described above absorbs heavy metals during the discharge of the pore water of the soil contaminated with heavy metals, thereby preventing secondary pollution from being generated by the pore water discharged to the ground.

In addition, the drainage material 100 of the present invention is installed in the ground by the core (110a) (110b) (110c) and the filter 120 is made of a biodegradable resin and completely biodegraded in a state where the drainage is completed to prevent disturbance or pollution of the underground ecosystem Will prevent it.

In addition, the drainage material 100 of the present invention can be installed in a variety of forms, such as the vertical direction or the horizontal direction in the ground can drain the number of gaps in the ground.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(100): drain material (110a) (110b) (110c): core
(111): perforated pipe (112): connecting member
(113): perforation hole (114): drainage space
(115): Spiral (116): Spiral groove
117: plate body 118: rib
120: filter 121: reactant
(122): overlap portion 130: diagonal line

Claims (12)

In the drainage material installed in the ground to drain the gap water when the soft ground is improved,
A core formed of a naturally degradable resin to drain the gap water in the ground;
It is formed of a biodegradable resin and is installed to surround the core, the surface of the fibrous filter to filter the contaminants of the pore water by the applied reactant is applied to the surface;
The reactant is made by mixing zero valent iron or zeolite or zero valent iron with zeolite,
The biodegradable resin forming the core and the filter comprises 70 to 130 parts by weight of dicarboxylic acid and 5 to 15 parts by weight of polyorganosiloxane based on 100 parts by weight of cyclodextrin, which is an oligosaccharide having a cyclic structure and having a cavity in the middle. Or
Or 100 parts by weight of PLA (polylactide) extracted from corn starch, 1-10 parts by weight of petroleum biodegradable resin-based PBAT (Polybutylene adipate-co-terephthalate) Drainage.
The method of claim 1,
Eco-friendly biodegradable drainage, characterized in that the reactant further comprises a s Korea to prevent the effective surface area of the reactant is increased due to the hydroxyl (OH) generated during the adsorption reaction of the pollutant.
delete The method of claim 1,
In the biodegradable resin to form the core,
Eco-friendly biodegradable drainage, characterized in that it further comprises 10 to 20 parts by weight of the inorganic filler with respect to 100 parts by weight of the oligosaccharide cyclodextrin to increase the strength of the core.
delete The method of claim 1,
In the biodegradable resin to form the core,
Eco-friendly biodegradable drainage, characterized in that it further comprises 10 to 20 parts by weight of inorganic filler with respect to 100 parts by weight of PLA.
The method according to claim 4 or 6,
The inorganic filler, hydroxyapatite, calcium carbonate (CaCO ₃ ), talc (Talc), environmentally friendly degradable drainage, characterized in that any one or more.
The method of claim 1,
The core may include a plurality of perforated pipes arranged at predetermined intervals and having a plurality of perforation holes to form a drainage space;
Eco-friendly biodegradable drainage, characterized in that configured including; connecting the pores, the connecting member is formed in a + shape to form a drainage space between the filter.
The method of claim 1,
The core is an eco-friendly biodegradable drainage, characterized in that a plurality of perforations are formed in a tubular shape in which a spiral is formed on the outer circumference.
delete Preparing a core using a biodegradable resin;
Preparing a filter using a biodegradable resin;
Applying a reactant made of ductile iron or zeolite to the surface of the filter;
And bonding the cores with the filter coated with the reactant, and bonding the overlapped portions after overlapping both ends of the filter.
The biodegradable resin has a cyclic structure and blends 70 to 130 parts by weight of dicarboxylic acid with respect to 100 parts by weight of cyclodextrin, an oligosaccharide having a cavity in the middle, and is heated under an acid catalyst to induce an esterification reaction, followed by polyorganosiloxane 5 to 5 Adding 15 parts by weight further to reduce the pressure to heat the production method of eco-friendly biodegradable drainage, characterized in that the manufacturing.
Preparing a core using a biodegradable resin;
Preparing a filter using a biodegradable resin;
Applying a reactant made of ductile iron or zeolite to the surface of the filter;
And bonding the cores with the filter coated with the reactant, and bonding the overlapped portions after overlapping both ends of the filter.
The biodegradable resin is prepared by mixing 1 to 10 parts by weight of polybutylene adipate-co-terephthalate (PBAT) based on petroleum biodegradable resin based on 100 parts by weight of PLA (polylactide) extracted from corn starch. Method for producing environmentally friendly biodegradable drainage.

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