KR101877730B1 - Melt-blown fiber web improved electrical conductivity and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a melt-blown fiber web. More specifically, the present invention relates to a technology for improving electrical conductivity of a melt-blown fiber web. According to the present invention, provided is a melt-blown fiber web with improved electrical conductivity. In addition, by providing the melt-blown fiber web with improved electrical conductivity, the fiber web is utilized as a filtering material, a moisture absorbing material, a sound absorbing material, an insulating material, a heat storing material, and an electromagnetic shielding material. A method for manufacturing the melt-down fiber web with improved electrical conductivity includes: a pellet manufacturing step; a radiating step; an activating step; and a plating step.

Description

[0001] MELT-BLOW FIBER WEB IMPROVED ELECTRICAL CONDUCTIVITY AND MANUFACTURING METHOD THEREOF [0002]

The present invention relates to a meltblown fiber web, and more particularly to a technique for improving the electrical conductivity of a meltblown fiber web.

Fiber webs using polymers are widely used as industrial textile materials. At present, research and development on high value-added functional fibers imparting various special functions such as antifouling property, antibacterial property, sound absorption property, ultraviolet light shielding property and electromagnetic wave shielding property to these fibers are actively carried out. However, since polymer-based fibers are electrically insulated, they can not discharge generated static electricity and transmit electromagnetic waves. Therefore, it is difficult to use them as a material for preventing static electricity and electromagnetic waves.

Recently, as the use of electronic and communication devices has been rapidly increasing, there has been a growing concern and concern about the harmful effects of electromagnetic waves, and as a result of research on electromagnetic waves having a negative effect on the human body, interest in the development of electromagnetic wave shielding technology is increasing. As a shielding material, fibers can be mass-produced at a low cost by using a polymer resin, and can be quantified at the same time. However, it is urgent to develop a technology that compensates for the electrical conductivity of the polymer fibers.

It is an object of the present invention to provide a meltblown fibrous web having improved electrical conductivity.

Another object of the present invention is to provide a method for utilizing the fiber web as a filter medium, an absorbing material, a sound absorbing material, an insulating material, a heat storage material and an electromagnetic wave shielding material by providing a meltblown fiber web having improved electrical conductivity.

In order to achieve the above object, the present invention provides a method for producing a meltblown fibrous web having improved electrical conductivity. The method for producing the meltblown fibrous web includes a pellet manufacturing step for producing pellets by melt extruding a polypropylene (PP) resin, a spinning step for producing a fiber web by spraying the pellets into a hot air stream, An activation step of activating the surface, and a plating step of nickel plating the surface-activated fibrous web.

Preferably, the pelletizing step melt-extrudes the polypropylene resin at a temperature of 130 to 200 캜. Also, the hot air current is supplied at an air supply speed of 80 to 400 m / s. And an air supply temperature of 200 to 350 ° C.

Preferably, the injected pellets of the spinning stage are collected with an aggregate having a rotational speed of 60 to 150 mm / s.

Preferably, the metal chloride is at least one selected from tin chloride (SnCl ₂ ) and palladium chloride (PdCl ₂ ). Further, the plating step uses a plating solution containing 200 to 350 g / L of nickel sulfate hydrate (NiSO ₄ · 6H ₂ O) and 30 to 60 g / L of nickel chloride hydrate (NiCl ₂ · 6H ₂ O).

According to the present invention, it is possible to provide a meltblown fibrous web having improved electrical conductivity.

Further, by providing a meltblown fibrous web having improved electrical conductivity, it is possible to provide a method of utilizing the fibrous web as a filter medium, an absorbing material, a sound absorbing material, an insulating material, a heat storage material, and an electromagnetic wave shielding material.

In addition, by applying the meltblown process in the production of fiber web, it is possible to mass-produce a fibrous web having improved electrical conductivity.

FIG. 1 is a schematic view of a process for producing a meltblown fiber web according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

A method for producing a meltblown fibrous web enriched with electrical conductivity according to an embodiment of the present invention includes the steps of producing a pellet by melt extruding a polypropylene (PP) resin, pelletizing the pellet into a hot air stream, An activation step of activating the fiber web surface with metal chloride, and a plating step of nickel plating the surface-activated fiber web.

The pellet production step is characterized in that the polypropylene resin is melt-extruded at 130 to 200 ° C. Specifically, in the pellet production step, a nanocomposite pellet having a diameter of 2 mm and a length of 10 mm is finally manufactured using a single extrusion extruder having three extruded sections and a diameter of 5 mm.

The hot air stream in the spinning stage is a high-speed hot air stream having an air supply rate of 80 to 400 m / s and an air supply temperature of 200 to 350 ° C. The air supply temperature is preferably 200 to 350 ° C. When the spinning temperature is lower than 200 ° C, the mixture is not completely melted and the fibers are broken or aggregated. When the temperature exceeds 350 ° C, the cost of maintaining the air supply temperature is increased.

The spinning step is also characterized by collecting the injected pellets with an aggregate having a rotational speed of 600 to 150 mm / s. If the velocity of the collecting body is 600 mm / s or more, the nanofibers can not be continuously collected from the collecting body after the melt-spinning process, which is undesirable. If the speed of the collecting body is 150 mm / s or less, Can not be collected at an appropriate speed and the fibers are bundled, which is not desirable.

The metal chloride in the activation step is characterized by being at least one selected from tin chloride (SnCl ₂ ) and palladium chloride (PdCl ₂ ). When activated by chlorination or palladium chloride, tin and palladium ions are formed on the fiber surface. The tin ions and palladium ions formed on the surface of the fiber have excellent performance as a reducing agent, thereby improving the nickel plating efficiency.

The plating step is characterized by using a plating solution containing 200 to 350 g / L of nickel sulfate hydrate (NiSO ₄ · 6H ₂ O) and 30 to 60 g / L of nickel chloride hydrate (NiCl ₂ · 6H ₂ O). When the concentration of nickel sulfate hydrate is less than 200 g / L, the concentration is not enough to cause reduction of nickel. When the concentration of 350 g / L is excessive, nickel ions are excessively contained and aggregation may occur. Also, in the case of nickel chloride hydrate, the concentration of 30 g / L is not enough to cause reduction, and the concentration of 60 g / L is not preferable because excessive nickel ions may cause aggregation.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these examples are for illustrative purposes only and that the scope of the present invention is not construed as being limited by these examples.

Example  One.

The polypropylene (PP) resin is melt-extruded at a temperature of 130 캜 using an extruder to produce pellets. The prepared pellets are sprayed into a high-speed hot air stream having an air supply rate of 80 m / s and an air supply temperature of 200 ° C by means of a melt-blown apparatus. The spinning speed of the collector at this time is 60 mm / s, and the distance between the spinneret and the collector (DCD) is 100 mm to produce a polymer fiber web.

The prepared fibrous web is pretreated with 5M nitric acid aqueous solution for 30 minutes, washed and dried. Also, the fibrous web pretreated with aqueous nitric acid solution is activated for 5 minutes in tin chloride (SnCl ₂ ) solution and then washed. And activated in a solution of palladium chloride (PdCl ₂ ) for 5 minutes. The activated fiber web is placed in a nickel electroless plating solution and is held at a temperature of 50 ° C for 1 minute to prepare a nickel-coated meltblown fiber web. The composition of the nickel electroless plating solution _{NiSO 4 6H 2 O 280g / L} , NiCl 2 6H 2 O 40g / L, Na 3 C 6 H 5 O 7 1.5H 2 O 15g / L, NaH 2 PO 2 2H 2 O 100g / L, NH ₄ Cl 100 g / L and PbNO ₃ 30 g / L.

Example  2.

The same procedure as in Example 1 was carried out except that the air supply rate was 100 m / s and the rotation speed of the collector was 80 mm / s. Activation with tin chloride (SnCl ₂ ) solution and palladium chloride (PdCl ₂ ) is also carried out for 10 minutes each. The plating was also carried out at a temperature of 60 캜 for 3 minutes to prepare a nickel-coated meltblown fiber web.

Example  3.

The same procedure as in Example 2 was carried out except that the melt extrusion temperature was 150 캜, the air supply rate was 150 m / s, and the air supply temperature was 250 캜. Also, the rotation speed of the collector is 100 mm / s, and the DCD is 120 mm. Thereafter, activation with tin chloride (SnCl ₂ ) solution for 20 minutes and activation with palladium chloride (PdCl ₂ ) is carried out for 10 minutes. The plating was also carried out at a temperature of 70 캜 for 5 minutes to prepare a nickel-coated meltblown fiber web.

Example  4.

The same procedure as in Example 3 was carried out except that the air supply rate was 200 m / s and the DCD was 150 mm. After that, activation using tin chloride (SnCl ₂ ) solution and palladium chloride (PdCl ₂ ) was carried out for 20 minutes each. Further, a nickel-coated meltblown fiber web was prepared at a plating temperature of 80 캜 and a plating time of 10 minutes.

Example  5.

The same procedure as in Example 4 was carried out except that the melt extrusion temperature was 150 ° C and the air supply temperature was 300 ° C. Also, the rotating speed of the collector is set to 120 mm / s and the DCD is set to 200 mm. Thereafter, activation with a solution of tin chloride (SnCl ₂ ) and palladium chloride (PdCl ₂ ) is carried out for 20 minutes each. Also, the nickel-coated meltblown fiber web was prepared at a plating temperature of 85 ° C and a plating time of 10 minutes.

Example  6.

The same procedure as in Example 4 was carried out except that the air feeding rate was 300 m / s and the DCD was 250 mm. The activation is then carried out for 30 minutes with tin chloride (SnCl ₂ ) solution and with palladium chloride (PdCl ₂ ) for 45 minutes. Further, a nickel-coated meltblown fiber web was prepared at a plating temperature of 90 ° C and a plating time of 20 minutes.

Example  7.

The same procedure as in Example 6 was carried out except that the melt extrusion temperature was 200 占 폚 and the air supply temperature was 350 占 폚. At this time, the rotation speed of the collecting body is 150 mm / s and the DCD is 300 mm. Subsequently, the activation with a solution of tin chloride (SnCl ₂ ) and palladium chloride (PdCl ₂ ) is carried out for 45 minutes each. Further, a plating temperature of 100 占 폚 is used to produce a nickel-coated meltblown fibrous web.

Example  8.

The same procedure as in Example 7 was carried out except that the air feeding rate was 400 m / s and the DCD was 400 mm. Subsequently, activation with a solution of tin chloride (SnCl ₂ ) and palladium chloride (PdCl ₂ ) is carried out for 60 minutes each. Also, a nickel-coated meltblown fiber web was prepared at a plating time of 30 minutes.

Comparative Example  One.

The procedure of Example 5 was followed except that the meltblown fibrous web coated with nickel was prepared by spinning without preparing the pellets.

Comparative Example  2.

A meltblown fiber web was measured in the same manner as in Example 5 except that electroless nickel plating was not performed.

Preparation conditions of the nickel-coated meltblown fiber web according to the examples Sample name The temperature of the melt extruded part
( ^o C) Air supply speed
(m / s) Air supply temperature
( ^o C) Collector
Rotation speed
(mm / s) DCD
(mm) SnCl ₂
Activation time (min) PdCl ₂
Activation
Time (min) Plating temperature ( ^o C) Plating time (min) Example 1 130 80 200 60 100 5 5 50 One Example 2 130 100 200 80 100 10 10 60 3 Example 3 150 150 250 100 120 20 10 70 5 Example 4 150 200 250 100 150 20 20 80 10 Example 5 180 200 300 120 200 30 30 85 10 Example 6 180 300 300 120 250 30 45 90 20 Example 7 200 300 350 150 300 45 45 100 20 Example 8 200 400 350 150 400 60 60 100 30 Comparative Example 1 - 200 300 120 200 - - - - Comparative Example 2 180 200 300 120 200 - - - -

Measurement example  1. Electrical Conductivity Measurement

The resistivity of the meltblown fiber web prepared according to each example was measured through a four-probe point method with a resistivity tester (MCP-T610, Misubishi Chemical Analytech Co., Ltd.). The electrical conductivity was calculated using the measured resistivity values.

The electrical conductivity measurement results of the nickel-coated meltblown fiber web according to the examples Resistivity (Ω * cm) Example 1 5.34 x 10 ¹ Example 2 8.21 x 10 ⁰ Example 3 1.02 x 10 ^-1 Example 4 7.46 x 10 ^-2 Example 5 3.07 x 10 ^-4 Example 6 9.75 x 10 ^-3 Example 7 6.44 x 10 ^-2 Example 8 9.17 x 10 ⁰ Comparative Example 1 9.83 x 10 ³ Comparative Example 2 3.07 x 10 ³

Having described specific portions of the present invention in detail, those skilled in the art will appreciate that these specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (6)

A pellet manufacturing step of producing a pellet by melt-extruding a polypropylene (PP) resin;
A spinning step of spinning the pellets into a hot air stream to produce a fibrous web;
An activation step of activating the fiber web surface with a metal chloride; And
And a plating step of nickel plating the surface-activated fibrous web,
The pellet-making step comprises melt-extruding the polypropylene resin at a temperature of 150 to 200 DEG C,
The hot air current is a high-speed hot air current having an air supply rate of 200 to 300 m / s and an air supply temperature of 250 to 350 DEG C,
The spinning step collecting the injected pellets with an aggregate having a rotation speed of 100 to 150 mm / s,
The metal chloride is stannous chloride (SnCl _2), and is 1 or more selected from palladium chloride (PdCl _2), the plating step of nickel sulfate hydrate _{(NiSO 4 · 6H 2 O)} 280g / L, nickel chloride hydrate (NiCl _{2 · 6H 2 O) 40 g /} L, sodium citrate monohydrate _{(Na 3 C 6 H 5 O} 7 · 1.5H 2 O) 15g / L, sodium phosphate monohydrate _{(NaH 2 PO 2 · 2H 2} O) to 100 g / L Wherein the plating liquid is a plating liquid containing a plating liquid.

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