KR20170103540A - Antimony Reduction tricot fabric filtration and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an antimony reduction tricot filtration fabric and a manufacturing method thereof and, more specifically, to an antimony reduction tricot filtration fabric capable of reducing antimony through a simple process and a manufacturing method thereof. The manufacturing method comprises the steps of: (1) manufacturing a sheath-core composite yarn by synthesizing a PET resin and a polyester resin; (2) manufacturing a tricot filtration fabric with the sheath-core composite yarn; and (3) eluting and removing antimony from the tricot filtration fabric.

Description

Antimony Reduction Tricot Filtration Fabric and Method of Manufacturing the Same [

The present invention relates to an antimony reduced tricot filtration fabric and a method for producing the same, and more particularly, to an antimony reduced tricot filtration fabric capable of reducing antimony through a simple process and a manufacturing method thereof.

The filtration process is one of the most important processes in low energy and high efficiency separation technology of modern industry by separating solid particles from a fluid by passing a fluid through a filtration medium and causing particles larger than pores to deposit on the filter medium. The principle of this filtration process is explained by Direct Interception, Inertial Impaction, Diffusion Interception, and Electrostatic Attraction.

Direct Interception refers to the phenomenon that the size of the contaminant particles in the fluid is larger than the pore size of the filter material and can not pass through the filter and is caught by the filter. Inertial Impaction As the contaminant particles move like a fluid, they are unable to follow the fluid as the flow angle of the fluid changes in front of the filter media and stick to the filter media due to inertia. This effect occurs when the fluid is liquid and the density of the contaminant particles in the liquid is higher than the liquid, often occurring in sand or pipe scales that have been settled in water. The diffusion filtration method (Diffusion) shows that the contaminant particles in the fluid are very small in size and light and can not move like the actual fluid flow, and they are out of the fluid flow by continuously colliding by the Brownian Movement . Because of this phenomenon, many gases are present in the gas rather than in the liquid. Even if the same filter is used, the filtration grade in case of liquid and gas may be different. Finally, particles with a relatively low charge tend to have a higher charge than usual under certain conditions. Electrostatic attraction is a phenomenon in which particles in the range of 0.1 to 1 are easily trapped by filter media Phenomenon. Actually, a method of increasing the filtration effect by generating an electrostatic field in front of the filtration system to charge the dust is also utilized. This filter filtering principle is not made by a single mechanism, but various mechanisms are acting in combination.

The type of filtration is divided into a reverse osmosis process, an ultrafiltration process and a microfiltration (0.1 to 10) process depending on the type of filtration membrane and filtration method. Among them, microfiltration filters are applied not only to the water treatment field but also to the filtration process of the pharmaceutical field, display, purification of solvents for fine chemical / semiconductor process, and petrochemical refining process. Filters of various materials are used according to the application situation.

The materials used for the filter have different characteristics depending on the surface charge, hydrophobicity, pH, oxidation durability, flexibility, etc., and can be largely classified into organic and inorganic materials.

The most commonly used organic film material is a polyolefin including polyethylene and polypropylene. In particular, polypropylene materials are chemically stable and can be used in a wide range of various organic solvents and water-soluble alkali solutions. They are the lightest among plastics and have high mechanical strength and excellent heat resistance. However, they are used for some chemicals such as chloroform There are limited disadvantages. Polytetrafluoroethylene (PTFE) filters, on the other hand, are very chemically stable to all chemicals, acids and alkalis, have very low solubility and stable properties, but are hydrophobic and require prewetting when filtering. There is a disadvantage that a high pressure is required. Polyether sulfone (PES) filters are hydrophilic and have a low protein adsorption capacity. However, they can not be used for ketones, esters, halogens and aromatic hydrocarbons. Nylon filters have very low elution properties like PTFE, And is widely used as a water-soluble and lipophilic filter, but it is not suitable for acid solutions, corrosive halogen hydrocarbons, protein samples and the like. In addition, polyvinylidene fluoride (PVDF) is a typical water-soluble filter. It is chemically very stable and has low protein adsorption power, but it is not suitable for strong acids, alkali solutions, esters, ketones and the like. In addition, the cellulose acetate (CA) filter has very low protein adsorption properties and is very good for the use of aqueous solutions and alkaline solutions, but organic solvents other than water-soluble samples are not applicable.

On the other hand, inorganic film materials include ceramics, metals, and glass fibers. In the case of the ceramic filter, it is widely applied to the field where the filter made of the conventional paper and the polymer can not be used because of its excellent heat resistance and chemical resistance. The metal filter is resistant to impact even at high temperature and high pressure, And it is widely applied to removal of impurities such as general gas, water vapor, various oil residue, high viscous liquid, liquid metal, piping scale of the hydraulic line, chemicals, solvent liquefied gas, water and the like. In addition, glass fiber filters have strong hydrophilic properties and can be used for viscous and large-sized samples, but they can not be used for benzyl alcohol. Therefore, when selecting the filter, it is very important to select the filter considering the chemical characteristics of the fluid and the chemical resistance between the materials of the filter media.

Korean Patent Publication No. 2000-0060433 discloses an invention relating to a tricot filtration furnace used in a reverse osmosis type domestic separation membrane filter. Such a structure provides an effect of having sufficient strength, but the produced tricot fabric is used in an epoxy resin Since impregnation method is used, there is a problem that harmful substances such as amine and bisphenol A are dissolved when heat is applied after processing and antimony is eluted into the filtered water due to the heat treatment of the polyethylene terephthalate material as the material of the fabric There was a problem. As a result, there is a problem that it is difficult to have an effect of reducing antimony through a simple process.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an antimony reduced tricot filtration fabric for reducing antimony through a simple process.

In order to solve the above-mentioned problems, the present invention provides a process for producing a core-sheath type composite yarn by (1) spinning a PET resin and a polyester resin to produce a core-sheath type composite yarn, (2) 3) eluting antimony from the tricot filtration fabric and removing it. The present invention also provides a process for producing an antimony reduced tricot filtration fabric.

According to a preferred embodiment of the present invention, the PET resin is a resin for a deep layer part, and the resin for the deep layer part is prepared by mixing terephthalic acid and 1,2-ethanediol at a molar ratio of 1: And 0.01 to 0.05 part by weight of a catalyst containing antimony trioxide is added to 100 parts by weight of the first mixture to produce a resin by a polycondensation reaction at 230 to 320 ° C Step. ≪ / RTI >

According to another preferred embodiment of the present invention, the polyester resin is a resin for a super-layer part, and the resin for the super-layer part mixes the acid component and the alcohol component at a molar ratio of 1: 0.8 to 2.2 at 200 to 300 캜, 0.01 to 0.05 part by weight of a catalyst containing antimony trioxide is added to 100 parts by weight of the second mixture, and the resultant mixture is subjected to a polycondensation reaction at 230 to 320 ° C. Wherein the acid component comprises at least one member selected from the group consisting of terephthalic acid and isophthalic acid, and the alcohol component may include 1,2-ethanediol and isopropanol.

According to another preferred embodiment of the present invention, the step (3) comprises the steps of: (3-1) heat treating the tricot filtration fabric at 150 to 230 ° C for 10 to 20 minutes; and (3-2) HNO ₃ ) and a solvent; and (3-3) impregnating the mixed solution with the tricot filtration fabric to remove antimony.

According to another preferred embodiment of the present invention, the silver nitrate silver concentration may be 0.1 to 5.0 N.

According to another preferred embodiment of the present invention, the impregnation may be performed at 20 to 30 DEG C for 18 to 60 minutes.

According to another preferred embodiment of the present invention, the antimony reduced tricot filtration fabric may have a reduction ratio of antimony of 90% or more when measured according to the following formula (1).

[Equation 1]

In order to solve the above-mentioned problems, the present invention provides an antimony reduced tricot filtration fabric produced by any one of the above-mentioned production methods.

In order to solve the above-described problems, the present invention provides a method for manufacturing an antimony reduced water treatment filter, comprising the step of fabricating a water treatment filter with an antimony reduced tricot filtration fabric manufactured by any one of the above manufacturing methods.

The antimony reduced tricot filtration fabric of the present invention and its production method have the effect of reducing antimony through a simple process.

Hereinafter, the present invention will be described in more detail.

As described above, recently, the material used in the tricot filtration furnace provides an effect of having sufficient strength. However, since the produced tricot fabric is impregnated with the epoxy resin, when subjected to heat at a high temperature after processing, There is a problem that harmful substances such as bisphenol A are dissolved, and there is a problem that antimony is eluted into the filtered water due to the heat treatment of the polyethylene terephthalate material as the material of the fabric. Accordingly, there is a problem that it is difficult to have an effect of reducing antimony through a simple process.

Accordingly, the present invention provides a process for producing a core-type composite yarn, comprising the steps of (1) spinning a PET resin and a polyester resin to produce a core-sheath type composite yarn, (2) And removing the antimony from the fabric to remove the antimony. The present invention has been made to solve the above-mentioned problems by providing a method for producing an antimony reduced tricot filtration fabric. As a result, the effect of reducing antimony can be achieved through a simple process different from the conventional invention.

First, a step (1) of producing a core-sheath type composite yarn by spinning a PET resin and a polyester resin is described.

The core-sheath type composite yarn is not particularly limited as long as it is a method for producing a composite yarn, and is preferably produced by composite spinning, more preferably by melt spinning.

On the other hand, the core-sheath type composite yarn of step (1) can be produced by melt-spinning a resin for a deep layer and a resin for a deep layer produced by carrying out a polymerization reaction under a catalyst containing an acid component and an alcohol component with antimony trioxide .

Specifically, the PET resin may be a resin for the deep layer part, and the resin for the deep layer part may contain terephthalic acid and 1,2-ethanediol at a molar ratio of 1: 1 to 2 at a temperature of 200 to 300 ° C, preferably 230 to 270 ° C , Preferably in a molar ratio of 1: 1.1 to 1.9, to prepare a first mixture by an esterification reaction, and adding a catalyst containing antimony trioxide to 100 parts by weight of the first mixture in an amount of 0.01 to 0.05 Preferably 0.02 to 0.04 part by weight, based on 100 parts by weight of the total amount of the resin, and then subjecting the resin to a polycondensation reaction at 230 to 320 ° C, preferably 260 to 305 ° C. If the temperature of the step of preparing the first mixture is lower than 200 ° C, the heat of reaction with the first mixture and the catalyst is insufficient to cause a polycondensation reaction, or a polycondensation product of a low molecular weight is formed, And when the temperature exceeds 300 ° C, the polycondensate is decomposed due to a high reaction heat, so that it is difficult to secure a desired polycondensate of high molecular weight or diethylene glycol and various dimers There is a possibility that the strength of the polycondensate formed by the formation of the byproducts of the stream is lowered and yellowing may occur. If the molar ratio of terephthalic acid and 1,2-ethanediol is less than 1: 1, it may be difficult to produce a desired high molecular weight polycondensate or difficulty in forming the resulting polycondensate, and when the molar ratio is 1 : If the ratio is more than 2, by-products may be generated excessively, which may lead to an increase in yarn tension and pack pressure in the spinning process to the unreacted material residue, resulting in a problem that the spinning workability is significantly lowered. If the amount of the catalyst is less than 0.01 part by weight based on 100 parts by weight of the first mixture, it may be difficult to form a desired polycondensation product of high molecular weight, and 0.05 parts by weight The whiteness of the formed polycondensate is low and it may act as a foreign matter in the spinning process and cause a problem of yarn breakage. If the temperature at which the polycondensation reaction is carried out is less than 230 ° C, the condensation reaction may not occur at a temperature lower than the melting point of the resin for the core layer, and if the temperature exceeds 320 ° C, It is difficult to secure a high molecular weight resin and carbonization of the resin may occur during the reaction due to the high temperature.

The polyester resin may be a resin for a super-layer part, and the resin for the super-layer part may contain the acid component and the alcohol component at a molar ratio of 1: 0.8 to 2.2 at 200 to 300 ° C, preferably 230 to 270 ° C, Preferably 1: 1 to 2, to prepare a second mixture by an esterification reaction, and adding 0.01 to 0.05 parts by weight of a catalyst containing antimony trioxide to 100 parts by weight of the second mixture , Preferably 0.02 to 0.04 parts by weight, per 100 parts by weight of the resin, and then subjecting the resin to a polycondensation reaction at 230 to 320 ° C, preferably 260 to 305 ° C. If the temperature at which the second mixture is prepared is lower than 200 ° C, the heat of reaction with the mixture and the catalyst may be insufficient to cause a polycondensation reaction, or a polycondensation product of a low molecular weight may be formed, If the temperature exceeds 300 ° C., the polycondensate is decomposed due to a high reaction heat, and it is difficult to obtain a desired polycondensate having a high molecular weight, or diethylene glycol produced due to a high heat of reaction other than the decomposition reaction, The strength of the polycondensate formed by the polymerization reaction may be lowered and yellowing may occur. If the molar ratio of the acid component and the alcohol component is less than 1: 0.8, it may be difficult to produce a desired polycondensate of high molecular weight or difficulty in forming the polycondensate, The byproducts may be excessively generated, leading to an increase in yarn tension and pack pressure in the spinning process to the unreacted material residue, resulting in a problem that the spinning workability may be remarkably deteriorated. If the amount of the catalyst is less than 0.01 part by weight based on 100 parts by weight of the second mixture, it may be difficult to form a desired polycondensate of high molecular weight, and 0.05 parts by weight The whiteness of the formed polycondensate is low and it may act as a foreign matter in the spinning process and cause a problem of yarn breakage. If the temperature at which the polycondensation reaction is carried out is less than 230 占 폚, the resin for the core part may not melt and the condensation reaction may not occur. If the temperature exceeds 320 占 폚, the resin burns down, A problem that does not occur may occur.

On the other hand, the acid component of the acid component may include at least one member selected from terephthalic acid and isophthalic acid, and the alcohol component may include 1,2-ethanediol and isopropanol.

Next, the step (2) for manufacturing the core-sheath type composite yarn tricot filtration fabric will be described.

The step of preparing the tricot filtration fabric is not particularly limited as long as it is a method of producing a tricot filtration fabric. Preferably, the core material and the supernatant are prepared by a conventional method, Pre-treatment is carried out at ~ 110 ° C for 25 to 35 minutes to remove impurities and heat treatment at a temperature of 180 ° C to 200 ° C at a rate of 15 to 26 m / s in a heat tender.

Next, the step (3) for eluting and removing antimony from the tricot filtration fabric will be described.

The step (3) may include (3-1) heat treating the tricot filtration fabric, (3-2) preparing a mixed solution, and impregnating the tricot filtration fabric.

The step (3-1) may heat-treat the tricot filtration fabric at 150 to 230 ° C, preferably 160 to 210 ° C for 10 to 25 minutes, preferably 13 to 20 minutes. If the temperature of the heat treatment is less than 150 ° C, the formed tri-gog fabric may have a reduced mechanical strength, resulting in difficulty in exhibiting a desired function. When the temperature exceeds 200 ° C, energy efficiency and economical efficiency are poor, Is damaged One problem may arise. If the heat treatment time is less than 10 minutes, the mechanical strength of the formed tri-gog fabric may be lowered, resulting in difficulty in manifesting a desired function. If the time exceeds 25 minutes, energy efficiency and economical efficiency may become poor .

Further, the above-mentioned (3-2) comprises the steps of: preparing a mixed solution containing the tricot fabric was filtered calcium chloride (CaCl ₂₎ and nitric acid (HNO ₃₎ and the at least one solvent selected from, preferably nitric acid and a solvent . ≪ / RTI >

In the step (3-3), the mixed solution may be impregnated with the tricot filtration fabric to remove antimony.

When calcium chloride is contained in the mixed solution, the reaction can be carried out at 80 to 120 ° C, preferably 90 to 110 ° C for 20 to 28 hours, preferably 22 to 26 hours. However, It is preferable to impregnate the impregnation solution containing nitric acid. When the impregnation solution contains nitric acid, it can be carried out at 20 to 30 ° C, preferably 23 to 28 ° C, for 18 to 60 minutes, preferably 20 to 50 minutes.

On the other hand, the above-mentioned nitric acid can be used without limitation as long as it is a nitric acid having no excessive damage to the fiber, preferably 0.1 to 5.0 N nitric acid, more preferably 0.3 to 3.0 N nitric acid, Preferably 0.5 to 1.0 N nitric acid. If the concentration of nitric acid is less than 0.1 N, the efficiency of removing antimony may be lowered. If the concentration of nitric acid exceeds 5.0 N, the efficiency of removing antimony may be increased. However, And the removal of residual nitric acid remaining in the fabric is not easy.

On the other hand, the residual solution remaining in the fabric in the high pressure water washing process can be removed during the full water inspection. Specifically, the remaining mixed liquid may be removed from the surface of the tricot filtration fabric in the high-pressure water washing process, but is not limited thereto.

According to a preferred embodiment of the present invention, the antimony reduced tricot filtration fabric may have an antimony reduction ratio of 90% or more, preferably 92% or more, more preferably 94% or less, % ≪ / RTI >

[Equation 1]

The present invention provides an antimony reduced tricot filtration fabric produced by any one of the above-mentioned production methods.

The present invention also provides a method for producing an antimony reduced water treatment filter comprising the step of preparing a water treatment filter with an antimony reduced tricot filtration fabric produced by any one of the above-mentioned production methods.

Hereinafter, the present invention will be described with reference to the following examples. The following examples are provided to illustrate the invention, but the scope of the present invention is not limited by the following examples.

[ Example ]

Manufacturing example  1: Preparation of tricot filtration fabric

 (1) Manufacture of Resins for Deep Grouting

Terephthalic acid and 1,2-ethanediol were mixed in a molar ratio of 1: 1.5, and a first mixture was prepared by esterification at 250 ° C. Then, 0.03 part by weight of antimony trioxide was added to the first mixture in 100 parts by weight of the first mixture to prepare a core resin (PET resin) by a polycondensation reaction at 285 ° C.

(2) Superstructure  Manufacture of resin

An acid component and an alcohol component were mixed at a molar ratio of 1: 1.5 to prepare a second mixture by esterification at 250 ° C. Then, 0.03 part by weight of antimony trioxide was added to the second mixture in an amount of 0.03 part by weight based on 100 parts by weight of the second mixture, and a polycarbonate resin (polyester resin) was prepared by a polycondensation reaction at 285 ° C.

(3) Heart-shaped  Composite fiber manufacturing

In order to produce core-sheath type conjugate fibers, core-sheath type conjugate fibers were prepared by putting the resin for the deep layer and the resin for the superstructure into a composite spinneret at a weight ratio of 1: 1 and melt spinning.

 (4) Heart-shaped  Manufacture of tricot filtration fabric using composite fibers

The ground fabric was prepared from the core-sheath type conjugate fiber and pretreated with a batch pretreatment machine at 100 ° C for 30 minutes to remove impurities to prepare a tricot filtration fabric. The tricot filtration fabric was extruded through a mini tenter , DL-2015) and heat-treated at a temperature of 180 ° C for 15 minutes to prepare a heat-treated tricot filtration fabric.

Comparative Manufacturing Example  One

Was prepared in the same manner as in Production Example 1, except that the heat treatment was not performed.

Example  One

To elute the antimony, 1 L of distilled water and 3.2 mg of 0.5 N nitric acid (HNO ₃ ) as an additive were added to a round flask having a capacity of 1 L and 5 g of the circular knitted fabric according to Preparation Example 1 was added thereto. Then, sodium hydroxide (NaOH) 8 < / RTI > Thereafter, the knitted fabric was taken out at 25 DEG C for 40 minutes. Thereafter, the high-pressure water was passed through and the whole water was inspected to remove the remaining nitric acid on the surface.

Example  2 to 14 and Comparative Example  One

The procedure of Example 1 was repeated except that the additives, impregnation temperature, time and pH were changed as shown in Table 1 below.

division Additive type Temperature (℃) Time (min) pH Example 1 0.5N HNO ₃ 25 40 8 Example 2 0.5N HNO ₃ 15 40 8 Example 3 0.5N HNO ₃ 40 40 8 Example 4 0.5N HNO ₃ 25 10 8 Example 5 0.5N HNO ₃ 25 80 8 Example 6 0.5N HCl 25 40 8 Example 7 The royal family ^{1 )} 25 40 8 Example 8 0.5N HNO ₃ 25 40 4 Example 9 0.5N HNO ₃ 25 40 10 Example 10 0.05N HNO ₃ 25 40 8 Example 11 0.2N HNO ₃ 25 40 8 Example 12 1.0N HNO ₃ 25 40 8 Example 13 4.5N HNO ₃ 25 40 8 Example 14 5.5N HNO ₃ 25 40 8 Comparative Example 1 CaCl ₂ 25 40 8 1) A solution of 0.5N nitric acid (HNO ₃ ) and 0.5N hydrochloric acid (HCl) in an equivalent ratio of 1: 3 was used for the above water.

Comparative Example  2

The same procedure was followed as in Example 1, except that the tricot filtration fabric was changed to a tricot filtration fabric according to Comparative Preparation Example 1.

Comparative Example  3

The procedure of Example 1 was repeated except that nitric acid was not added as the additive.

Experimental Example 1: Measurement of antimony (Sb) elution amount

The amounts of antimony elution were measured for the tricot filtration fabrics according to Examples 1 to 14 and Comparative Examples 1 to 3. Specifically, before performing the total water test, the eluted amount of antimony was measured using ICP-MS (Perkin Elmer, Nexion 300X) for the solution from which the tricot filtration fabric was taken out.

Thereafter, the same procedure as in Examples 1 to 14 and Comparative Examples 1 to 3 was carried out except for the full water inspections, and then the solution obtained by removing the tricot filtration fabric was subjected to ICP-MS (Perkin Elmer, Nexion 300X) And the amount of elution was measured. The measurement results are shown in Table 2 below.

Experimental Example  2: Strength measurement

The tie coat filtration fabrics according to Examples 1 to 14 and Comparative Examples 1 to 3 were subjected to adhesion strength measurement. Specifically, tricot filtration fabrics according to Examples 1 to 14 and Comparative Examples 1 to 3 were fabricated to a size of 100 mm (L) x 20 mm (W) x 10 mm (D) ) At a tensile speed of 500 mm / min. The average of 10 measured values excluding the maximum value and the minimum value among the measured values was analyzed to measure the adhesive strength. This is shown in Table 2 below.

Experimental Example  3: Surface Damaged  evaluation

In order to evaluate the surface damage of the tricot filtration fabrics according to Examples 1 to 14 and Comparative Examples 1 to 3, twenty of the workers in the textile and filter sectors having five years experience or more for each tricot filtration fabric were evaluated for surface damage Respectively. (◎ - not damaged, ○ - almost not damaged, ◇ - normal, △ - damaged, × - much damaged)

division Amount of antimony elution (ppb) antimony
Removal rate (%) Adhesive strength (N) Surface damage Before nitric acid impregnation After nitric acid impregnation Example 1 122 7 94 190 ◎ Example 2 38 7 82 187 ◎ Example 3 112 3.4 97 158 ○ Example 4 60 21 65 123 ◎ Example 5 108 0 100 162 ○ Example 6 122 6 95 170 ○ Example 7 105 6 94 171 ○ Example 8 130 2.5 98 148 ◇ Example 9 28 28 0 183 ○ Example 10 29 8 24 186 ◎ Example 11 81 6 54 184 ◎ Example 12 127 6 96 188 ◎ Example 13 132 6 100 163 ◇ Example 14 138 4 100 140 × Comparative Example 1 5.1 5.0 2 37 ◎ Comparative Example 2 7.3 0.3 96 42 ◎ Comparative Example 3 4.6 4.5 2 183 ◎

As can be seen from Table 2, Example 1 and Examples 11 to 13, which satisfy all of the process conditions and configurations of the present invention, are Examples 2 to 10, Example 14, and Comparative Example 1 ~ 3, antimony was excellent in removal rate and adhesion strength, and surface damage did not occur.

Specifically, Example 1 in which nitric acid was added as an additive and the impregnation process was performed at 25 占 폚 was superior to Example 2 in which the impregnation process was performed at 15 占 폚, and the antimony removal rate and adhesion strength were excellent. And nitric acid impregnation. In addition, the antimony removal rate was not significantly different from Example 3 in which the impregnation process was performed at 40 ° C, but the adhesion strength was excellent. In Example 3, the surface of the tricot filtration fabric was damaged.

Example 1, in which nitric acid was added as an additive and the impregnation step was performed for 40 minutes, was superior to Example 4 in which the impregnation step was performed for 10 minutes, and the antimony removal rate and adhesion strength were excellent. The difference in the amount of antimony elution after nitric acid impregnation was remarkably large. In addition, although the antimony removal rate was slightly lower than that of Example 5 in which the impregnation process was performed for 80 minutes, the adhesion strength was excellent. In Example 5, the surface of the tricot filtration fabric was damaged.

In Example 1 using nitric acid as an additive, Example 6 using hydrochloric acid and Example 7 using aqua regia, the antimony removal rate was excellent, but the chlorine gas was generated in Examples 6 and 7, The adhesive strength is low and the surface is damaged.

In Example 1, in which the impregnation solution had a pH of 8, the antimony removal rate was slightly lower than in Example 8 in which the pH was 4. However, in Example 8, the bonding strength was low and the surface of the tricot filtration fabric was damaged . In Example 9, antimony was not removed at all, adhesive strength was low, and surface damage occurred.

In Example 1 in which the concentration of nitric acid was 0.5 N, Example 11 in which the concentration was 0.2 N, Example 12 in which the concentration was 1.0 N, and Example 13 in which the concentration was 4.5 N, 10, and the bonding strength was much higher than that of Example 14 in which the concentration of nitric acid was 5.5 N, and the surface damage was small. In Example 14, the surface was excessively damaged and was unusable.

In addition, Example 1 using nitric acid as an additive was superior in antimony removal rate and adhesive strength to Comparative Example 1 using calcium chloride as an additive.

In addition, Example 1 in which the heat treatment process was performed showed superior antimony removal amount as compared with Comparative Example 2 in which the heat treatment process was not performed. In Comparative Example 1, antimony hardly eluted after impregnation, A problem that is difficult to apply to the present invention has occurred.

In addition, Example 1, which was carried out with the addition of the additive, showed significantly higher antimony removal rate than Comparative Example 3 which did not contain the additive. The difference between the antimony leaching amount before nitric acid impregnation and the antimony leaching amount after nitric acid impregnation was significantly higher than that of Comparative Example 3, Although there was no significant difference, the adhesive strength was excellent.

Claims (9)

(1) preparing a core-sheath type composite yarn by spin-spinning a PET resin and a polyester resin;
(2) fabricating the core-sheath type composite yarn tricot filtration fabric; And
(3) eluting antimony from the tricot filtration fabric to remove the antimony. The method according to claim 1, wherein the PET resin is a resin for a deep-
The resin for the deep layer part is prepared by mixing terephthalic acid and 1,2-ethanediol at a molar ratio of 1: 1 to 2 at 200 to 300 ° C to prepare a first mixture by an esterification reaction; And
And 0.01 to 0.05 part by weight of a catalyst containing antimony trioxide is added to 100 parts by weight of the first mixture to produce a resin by a polycondensation reaction at 230 to 320 ° C. Wherein the antimony reduced tricot filtration fabric is produced by a method comprising the steps of: The polyester resin composition according to claim 1, wherein the polyester resin is a resin for an ultra-
The resin for the super-layer part may be prepared by mixing an acid component and an alcohol component at a molar ratio of 1: 0.8 to 2.2 at 200 to 300 ° C to prepare a second mixture by an esterification reaction; And
And 0.01 to 0.05 part by weight of a catalyst containing antimony trioxide is added to 100 parts by weight of the second mixture to produce a resin for a superstrate by a polycondensation reaction at 230 to 320 ° C.,
Wherein the acid component is at least one selected from terephthalic acid and isophthalic acid,
Wherein the alcohol component comprises 1,2-ethanediol and isopropanol. ≪ RTI ID = 0.0 > 11. < / RTI > The method of claim 1, wherein the step (3)
(3-1) heat treating the tricot filtration fabric at 150 to 230 ° C for 10 to 20 minutes;
(3-2) preparing a mixed solution containing nitric acid (HNO _3), and a solvent; And
(3-3) A method for producing antimony reduced tricot filtration fabric, comprising the step of impregnating the mixed solution with the tricot filtration fabric to remove antimony. 5. The method of claim 4, wherein the silver nitrate is 0.1 to 5.0 N in concentration. 5. The method of claim 4, wherein the impregnation is performed at 20 to 30 DEG C for 18 to 60 minutes. The method of claim 1, wherein the antimony reduced tricot filtration fabric has an antimony reduction of at least 90% as measured by the following equation (1).
[Equation 1]

An antimony reduced tricot filtration fabric produced by the method of any one of claims 1 to 7. A process for producing an antimony reduced water treatment filter, comprising: preparing a water treatment filter with an antimony reduced tricot filtration fabric produced by the manufacturing method according to any one of claims 1 to 7.