KR102085476B1 - Fabrication method of non-woven geotextile with adsorption function of heavy metals and harmful substances - Google Patents

Abstract

The present invention relates to a geotextile having a function of adsorbing heavy metals and harmful substances, which has a function of adsorbing harmful ingredients in leachate, a function of protecting a geomembrane which is a dimension liner, and a filtering and drainage function. The present invention relates to a method for manufacturing a nonwoven geotextile composed of an inner short fiber aggregate and an outer short fiber aggregate attached to one side or both sides of the inner short fiber aggregate, the method comprising: a first step of preparing pellets for fiber spinning by adding particulate clay to a silica resin and melt-compounding the same; a second step of mixing a polypropylene resin with pellets prepared by the first step; a third step of placing the resin mixed in the second step into an extruder and heating the same to vaporize the silica resin surrounding the particulate clay to remove gas; a fourth step of preparing fibers containing clay by spinning the resin in a state where the vaporized gas of the silica resin is removed by means of melt spinning; a fifth step of forming the inner short fiber aggregate and the outer short fiber aggregate by using the clay-containing fibers prepared in the fourth step as matrix fibers, and using low-melting short fibers that melt at 80-220 °C as reinforcing fibers; a sixth step of controlling the density and thickness by heating and compressing the short fiber aggregate prepared by the fifth step at a constant temperature and pressure; and a seventh step of laminating the short-fiber aggregate prepared by the sixth step and then needle-punching and combining the same.

Description

Fabrication method of non-woven geotextile with adsorption function of heavy metals and harmful substances

The present invention relates to a method of manufacturing a geotextile having the adsorption function of heavy metals and harmful substances, and more particularly, has the adsorption function of harmful components contained in the leachate, and the protection function of the geomembrane which is a liner as well as filtration and drainage. The present invention also relates to a method of manufacturing a geotextile having excellent adsorption of heavy metals and harmful substances.

In general, geotextiles are mainly used as flooring of landfills, and are geotextiles that play an important role in not only supporting landfilled waste but also draining leachate or sewage generated from waste. The leachate from waste landfill has strong acidity or alkalinity, and if the garbage decays, the exposure temperature rises to 80 ℃, and the geotextile has strong physical properties to withstand the environment of the landfill such as being exposed to ultraviolet rays or sunlight for a long time. It must consist of materials.

In Korea, according to the Waste Management Act Enforcement Rule revised on August 9, 1999, it is mandatory to install a protective material on the top of the screen and construct a civil synthetic resin drainage layer on the top of the screen.

The selection of materials satisfying the revised mandatory regulations is extremely limited in selection when using existing products, and it is difficult to satisfy the regulations with a single product, so it is necessary to combine two or more products or install a combination product. As a result, it is uneconomical due to excessive installation cost, prolonged installation period, difficulty in securing product quality and construction safety.

In addition, according to the Waste Management Act Enforcement Rule revised on August 9, 1999, the standard for installing the bottom of a landfill site during the construction of a landfill site is a compacted clay layer or compacted clay mineral layer with a permeability factor of 10-7 cm / sec or less and a thickness of 50 cm or more from the bottom. It is required to install a water-repellent film with a thickness of 20 mm or more on it, and to install a leachate drainage layer with sand having a permeability coefficient of 10-2 cm / sec or more and a thickness of 30 cm or more. In addition, a protective material such as a geocomposite or a non-woven geotextile is installed between the containment membrane and the leachate drainage layer so that the barrier can be protected under the load acted by the landfill waste and the leachate drainage layer.

However, most of the landfill sites in Korea use crushed gravel (thickness: 50mm or more) as the material of the leachate drainage layer. Therefore, the use of geo-composite, which is poor in puncture resistance, is a material to prevent damage to the membrane from the applied load. It is desirable to use nonwoven geotextiles that are unsuitable and have a significant thickness.

In accordance with the above regulations, conventionally, a three-layered geotextile, which simply mixes a low melting point fiber and a high melting point fiber, is mainly used. The conventional nonwoven geotextiles satisfy a large number of transmission coefficients by simple lamination methods such as air lamination method or web lamination method using a molding machine for short fibers made of synthetic fiber yarns such as polyester and polypropylene, and have no other functions. to be.

Republic of Korea Patent Registration No. 0367819 Korea Utility Model Registration No. 426979 Korea Utility Model Registration No. 408284

The present invention has a adsorption function of harmful components in leachate, and provides a method of manufacturing a geotextile having a superior adsorption function as well as a filtration and drainage function of the geomembrane which is a liner.

The object of the present invention is a method for producing a nonwoven geotextile consisting of an inner nonwoven fabric and an outer nonwoven fabric attached to one or both sides of the inner nonwoven fabric, comprising: 1) adding fiber clay to the slica resin to melt-compound the fiber Preparing a pellet; 2) mixing the polypropylene resin and the fillet prepared by step 1) to the polypropylene resin; 3) removing the gas by putting the resin mixed in step 2) into an extruder and heating to vaporize the slica resin surrounding the particulate clay; 4) preparing a fiber containing clay by spinning a resin in which the vaporized gas of the slica resin is removed by melt spinning; 5) using the clay-containing fibers prepared in step 4) as a matrix fiber, and using a low melting point short fiber melted at 80 ~ 220 ℃ as a reinforcing fiber to form an inner short fiber assembly and an outer short fiber assembly; 6) controlling the density and thickness by heating and compressing the short fiber assembly prepared by step 5) at a constant temperature and pressure; 7) bonding the short fiber aggregates prepared in step 6) by needle punching after lamination; It is achieved by a method for producing a nonwoven geotextile having the adsorption function of heavy metals and harmful substances, characterized in that in order to produce.

The clay is achieved by a method for producing a nonwoven geotextile having the adsorption function of heavy metals and harmful substances, characterized in that contained 15 to 20% by weight of the total weight.

The matrix fiber is achieved by a method for producing a nonwoven geotextile having the adsorption function of heavy metals and harmful substances, characterized in that the hollow fiber.

The present invention is a useful invention that has the effect of adsorption of harmful components in leachate, and has the effect of adsorption of heavy metals and harmful substances excellent in filtration and drainage as well as the protection of geomembrane which is a liner.

1 is a manufacturing process showing a manufacturing method of the present invention.
Figure 2 is a perspective photograph showing the structure of the short fiber aggregate produced by the present invention.
Figure 3 is a perspective photo showing the structure of a typical monofilament aggregate.
4 is a cross-sectional view showing a structure of a nonwoven geotextile having an adsorption function produced by the manufacturing method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a manufacturing process diagram showing the manufacturing method of the present invention accordingly

1) a first step (S100) of manufacturing a fiber spinning pellets by adding a particulate clay to the slica resin by melt compounding;

2) a second step (S200) of mixing the fillet prepared by the first step (S100) to the polypropylene resin and polypropylene resin;

3) a third step (S300) of putting the resin mixed by the second step (S200) into an extruder and heating to vaporize the slica resin surrounding the particulate clay to remove gas;

4) a fourth step (S400) of producing a fiber containing clay by spinning the resin in the state of removing the vaporized gas of the slica resin by melt spinning method;

5) Using the clay-containing fibers prepared in the fourth step (S400) as a matrix fiber, using the low melting point short fiber melted at 80 ~ 220 ℃ as a reinforcing fiber to form an inner short fiber assembly and an outer short fiber assembly A fifth step (S500) to make;

6) a sixth step (S600) step of controlling the density and thickness by heating and pressing the short-fiber aggregate manufactured by the fifth step (S500) at a constant temperature and pressure;

7) a seventh step (S700) of laminating the short-fiber assembly prepared by the sixth step (S600) and then needle punched to combine; Prepare in order.

The first step (S100) is to add a clay to the liquid slica resin to form a coating layer of the slica resin in the clay. First, the clay powder made of 0.01 ~ 0.5 micrometer (μm) fine powder is heated to remove moisture and dry the surface, and then the clay is mixed with silica resin to form a coating layer on the surface of the clay. In this case, a dispersant may be used. .

On the other hand, the first step (S100) is to put the clay in the stirrer containing the slika resin in the liquid state, and stirred by rotating the stirrer. At this time, when heated to a constant temperature, the slica resin can be easily stirred without solidification.

The silica resin has an effect of mixing the clay, which is an inorganic material, with a polypropylene resin or a polypropylene resin to facilitate dispersion. The reason why the dispersion is easy is to make the coating layer buoyant so that it can be evenly distributed in the polypropylene resin or the polypropylene resin while preventing the clay from mixing with the polypropylene resin or the polypropylene resin. Make sure

As the material for forming the coating layer, any one of silica, sealant, and siloxane may be used, and in particular, silyl-modified polyethers of the sealant may be used. The reason is that the adhesion is very good, the curing speed is very fast, and the surface is dried within 15 to 20 minutes, so there is less dust on the surface.

When the size of the clay powder made of the fine powder is less than 0.01 micrometer (μm), there is a problem that the cost is significantly increased and far-infrared radiation is significantly weakened, and when the size of 0.5 micrometer (μm) or more has a size, the radiation pressure increases and the radiation This is because there is a problem of causing scratches on the surface of the nozzle during clogging or spinning.

As described above, when the coating layer is formed, a drying process is performed to cure the coating layer. Here, it is possible to form coated clay containing 40 to 85% by weight of clay and containing 10% by weight or less (excluding 0) of an additive including a dispersant.

The second step (S200) is a step of mixing the fillet prepared by the first step (S100) to the polypropylene resin and polypropylene resin, and the above-described coated clay and polypropylene resin and polypropylene resin.

At this time, the polypropylene resin and polypropylene resin is a liquid synthetic resin. When the clay is mixed with the polypropylene resin and the polypropylene resin in the liquid state, when there is no coating layer, it is settled by specific gravity of the illite, but the coating layer is formed and is prevented from sinking.

Therefore, since the clay can be uniformly dispersed, the number of clays can be uniformly formed on average when manufacturing a masterbatch chip, thereby improving product quality.

The third step (S300) is a mixture of the polypropylene resin and polypropylene resin, that is, the clay is provided with a coating layer in a predetermined ratio in the synthetic resin for fibers using a stirrer and mixed by the second step (S200) The resin is put into an extruder and heated to 200 ℃ ~ 300 ℃ and pressurized at a pressure of 70-100kg / cm2 G to remove the silica resin, sealant or siloxane to form a coating layer. This step removes moisture.

If the third step (S300) is not carried out because the spinning fibers may cause a change in physical properties may cause problems.

In the fourth step S400, after the third step S300, the liquefied resin to which the clay is added is added to the spinning hopper and the yarn is melt-spun at a temperature of about 200 ° C to 300 ° C to obtain fibers.

The fifth step (S500) using the clay-containing fiber prepared in the fourth step (S400) as a matrix fiber (high melting point fiber), using a low melting point fiber that is melted at 80 ~ 220 ℃ as a reinforcing fiber The inner short fiber assembly 200 and the outer short fiber assembly 100 are formed.

The short fiber assembly is a mixture of high melting point short fibers having a thickness of 4 to 25 deniers and a length of 50 to 80 cm and low melting point short fibers having a thickness of 4 to 25 deniers and a length of 50 to 80 cm. There is an air layer lamination method and a web lamination method using a molding machine for random lamination. Preferably, the air lamination method is used to form a short fiber assembly by mixing and laminating high melting short fibers and low melting short fibers.

When the fifth step (S500) is completed, a typical general short fiber assembly becomes white as shown in FIG. 3, but the short fiber assembly of the present invention is brown like clay as shown in FIG. 2. Will have the color of.

When the fifth step (S500) is completed to perform a sixth step (S600) to form a short fiber assembly by heating and pressing the short fiber assembly to a predetermined pressure to adjust the thickness and density, and then cut to a desired size, and the sixth When the step S600 is completed, as shown in FIG. 4, the inner short fiber assembly 200 and the outer short fiber assembly 100 are laminated, and needle punching is performed to perform the seventh step S700.

The inner short fiber assembly 200 is a non-woven geotextile having an adsorption function using a conventional short fiber assembly and the outer short fiber assembly 100 is made using short fibers containing clay to which the technique of the present invention is applied. Can be prepared and used.

After mixing the 3% of the clay and 97% of the polyester resin of the present invention to prepare a fiber, the properties of the fiber were shown as shown in Table 1.

Table 1 Component of clay added polyester fiber

Using the fiber having the characteristics described above, the adsorption experiment of the toxic components as shown in Table 2 and the tensile properties of Table 3 were tested.

Test Method: ASTM D1987-95 (2002)

Experimental condition:

Comparative Example 1

Using a 12 denier fiber made of 100% polyester resin 270 g / m ^2, 2mm thick needle-punched aggregate assembly.

Comparative Example 2

Using a 12 denier fiber made of 100% polyester resin ^, the short fiber assembly was needle-punched 450g / m ^2, 4mm thick.

Comparative Example 3

Using a 12 denier fiber made of 100% polyester resin, 780 g / m ^2, 8 mm thick needle-punched aggregate assembly.

Comparative Example 4

Using a 12 denier fiber made of 100% polyester resin ^, a single fiber aggregate punched by needle 1500g / m ^2, thickness 10mm.

Example 1

A short fiber aggregate having a weight of 270 g / m ² and a thickness of 2 mm using 12 denier fibers composed of 3% clay and 97% polyester resin.

Example 2

Using a 12 denier fiber composed of 3% clay and 97% polyester resin ^, a single fiber aggregate punched by a needle of 450 g / m ^{2 and a} thickness of 4 mm.

Example 3

Using a 12 denier fiber made of 3% clay and 97% polyester resin ^, a single fiber aggregate punched by needle punching with a weight of 780 g / m ^{2 and a} thickness of 8 mm.

Example 4

Using a 12 denier fiber made of 3% clay and 97% polyester resin ^, a single fiber aggregate punched by needle 1500g / m ^{2 and} thickness 10mm.

Table 2 Component adsorption of polyester nonwoven geotextiles

Table 3 Tensile properties of polyester nonwoven geotextiles

As can be seen from the above experiments, the tensile strength in the vertical and horizontal directions increased with weight, but the tensile strain decreased with weight in both polyester and nonwoven geotextiles.

In addition, as in the present invention, the chemical resistance by maintaining the strength and strain of addition (example) and addition of clay (comparative example) showed the same tendency as temperature, and this value decreased with temperature, and the addition of clay according to the present invention (Example) The functional polyester nonwoven geotextile showed excellent adsorption efficiency compared to the non-additive clay (comparative example).

Therefore, the present invention is a useful invention that has the effect of adsorption of harmful components in the leachate, and has an excellent adsorption function, as well as the filtration and drainage function of the geomembrane which is a liner.

Claims (3)

In the method of manufacturing a nonwoven geotextile consisting of an inner short fiber assembly and an outer short fiber assembly attached to one side or both sides of the inner short fiber assembly,
1) preparing a pellet for fiber spinning by adding a particulate clay to the slica resin by melt compounding;
2) mixing the fillet prepared by step 1) to the polypropylene resin and the polypropylene resin;
3) removing the gas by putting the resin mixed in step 2) into an extruder and heating to vaporize the slica resin surrounding the particulate clay;
4) preparing a fiber containing clay by spinning a resin in which the vaporized gas of the slica resin is removed by melt spinning;
5) using the clay-containing fibers prepared in step 4) as a matrix fiber, and using a low melting point fiber melted at 80 ~ 220 ℃ as a reinforcing fiber to form an inner short fiber assembly and an outer short fiber assembly;
6) controlling the density and thickness by heating and compressing the short fiber assembly prepared by step 5) at a constant temperature and pressure;
7) bonding the short fiber aggregates prepared in step 6) by needle punching after lamination; Method for producing a nonwoven geotextile having the adsorption function of heavy metals and harmful substances, characterized in that in order to manufacture. The method of claim 1,
Method for producing a nonwoven geotextile having the adsorption function of heavy metals and harmful substances, characterized in that the clay is contained 15 to 20% by weight of the total weight.
The method of claim 1,
The matrix fiber is a method of manufacturing a nonwoven geotextile having a function of adsorption of heavy metals and harmful substances, characterized in that the hollow fiber.

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