KR920009003B1 - Conductivity polyester fiber - Google Patents

Abstract

A white electroconductive polyester composite fiber is composed of: A component of regular polyester rein, B component of modified polyester resin of ooficial water content of 2-5 %, specific electric resistance 107-1010 cm and whose occupying ratio among whole cross section is 5-20 % and whose finely-dispersed number among a cross-section is 4-8, and C component of polyester resin, whose occupying ration among whole cross-section is 5-10 %, having micro-powders, in which titanium oxides coated with tin compds. and antimony oxides coated with above compds. are mixed in 20:80 - 50:50 ratio, occupying 10-35 % among C component. This fiber features good deterrence of static occurrences and maintenance of anti-static property.

Description

Conductive polyester fiber

1 is a cross-sectional view of the white-based conductive yarn of the present invention composed of eight B components.

2 is a comparative cross-sectional view of a two-component static eliminator composed of only A and B components.

Figure 3 is a cross-sectional view of the three-component complex spinning detention used in the present invention.

Figure 4 is a cross-sectional view of the white-based conductive yarn of the present invention manufactured using a three-component complex spinning yarn.

* Explanation of symbols for the main parts of the drawings

A component: Polyester resin B component: Modified polyester resin

C component: Polyester resin mixed with titanium oxide and antimony oxide coated with tin compound

The present invention can control the generation of static electricity by the triboelectric charging of polyester and at the same time excellent in the ability of antistatic performance, and can be dyed when used for clothing can be produced white (white) and colored-based welfare It relates to a system-multiplexed polyester conductive fiber.

Conductive fibers are used in the manufacture of sterile, dust-free and high-tech electronic products, such as safety-proof, medical, surgical, and laboratory medicines for preventing industrial accidents in the petrochemical field. Synthesis used in a wide range of fields from various industries, such as breakage prevention and malfunction prevention, to comfortable materials for general clothing to prevent unpleasant sensation caused by static electricity generated from clothes detachment and health problems It is developed and used as an essential functional material for textiles.

As a conventional technique for manufacturing the same, a method of applying an antistatic material to a forge or a processed product completed from a technique using a metallic fiber has been proposed a method of incorporating and dispersing a conductive inorganic material such as needle conductive carbon black into a polymer. However, in the former case, there is a drawback of poor touch and durability when used for clothing, and in the latter case, the fiber-forming polymer itself has a low content of crystal water, which is insufficient to play a role as a conductive medium. It is a cause of performance deterioration due to the discontinuity of the conductive particles, and in particular, carbon black becomes impossible to dye, and thus it is insufficient to be used as a conductive material for high-quality clothing with aesthetic function.

The proposed white and colored conductive composite fibers have been proposed to be prepared by incorporating non-black, colorless and conductive inorganic particles into a single or two-component composite spinning method. As a method, it is difficult to solve the above-mentioned disadvantages, and in order to overcome this problem, when an excessive amount of inorganic conductive particles is added, it is not suitable for mass production and commercialization due to poor anti-wetting and poor physical properties. When manufactured, durability, touch, and appearance can be compensated for, but its performance is a level of antistatic performance, and it is impossible to apply to a field where high conductivity is required.

Accordingly, the present inventors have proposed a novel white-based composite conductive polyester fiber having improved problems described above.

The multi-conducting conductive polyester fiber according to the present invention arranges the fiber-forming white polymer in the outermost layer and the conductive white inorganic particles are mixed to align the components exhibiting excellent conductive performance in the center of the cross section of the yarn. It is a component that has the ability to disperse and mix particles to the maximum, and quickly moves static electricity generated by friction in the outermost layer to the center (innermost layer), and also contains a large amount of crystallized water capable of partial static elimination. It is a high-performance three-component composite fiber having a modified polyester medium polymer as an intermediate layer.

As shown in FIG. 1, the fiber manufactured according to the present invention has a three-layered composite structure having different electrical properties and melt flow characteristics for each component layer. The polymer used in the outermost layer (hereinafter referred to as Part A) is It is a conventional polyester resin with excellent fibrous performance, and has a flow characteristic in the molten state in relation to the A part, the middle layer (hereinafter referred to as B part), and the center layer (hereinafter referred to as C part) (polymer viscosity at the time of melting: 7melt) The following equation (Ⅰ) was satisfied.

(7melt A: Melt viscosity of outermost layer (part A) polymer)

(7melt B: Melt viscosity of middle layer (part B) polymer)

(7melt C: Melt Viscosity of Core Layer (C Part) Polymer)

The electrical properties were the same as that of ordinary polyester fibers, and the frictional electrification voltage in the letter state was 25,000 to 30,000 V, and the electrical resistivity was 10 ¹³ ΩCm or more, which was used to improve fiber formation and durability.

Component B has a fiber forming ability and has a crystal water many times more than that of polyester fiber and contains alternating voltage state due to surface friction and peeling of Part A. By inducing ionic discharge by self-crystallized water at the same time, it maintains the electrical resistivity of B ⁷ at the level of 10 ⁷ -10 ¹⁰ ΩCm. At this time, when the electrical resistivity of part B is 10 ¹⁰ ΩCm or more, it loses its function as a medium polymer, and when it is 10 ⁷ ΩCm or less, yarn formation is impossible.

The method for producing component B is copolymerization of a composition having a hydrophilic functional group at the terminal of the aliphatic main chain after the completion of the ester reaction using dimethyl telephthalate and ethylene glycol as a monomer or a hydrophilic functional group at the terminal of the dimethyl telephthalate monomer and the aliphatic main chain. After proceeding the initial reaction of the ester to the composition by adding ethylene glycol to terminate the reaction to prepare a polyester-based random block copolymer containing the purified water.

As a composition mainly used to increase the content of crystal water, a substance having a hydrophilic functional group such as amide crab and alcohol at the end of the linear aliphatic main chain, and their weight average molecular weight can be considered simultaneously with the polymerizable, fibrous, and hygroscopic functions. 800-2,000 is suitable and the mixing amount is 20% -50% of the weight of the final block copolymer.

In addition, the process moisture content of the B component should be maintained at 2-5%. If the content is less than 2%, the crystal water content is low, so that it cannot function as a medium polymer. However, radiation is impossible.

Contribution to the conductive fiber performance (reduction of specific resistance) of the component B prepared as described above is affected by the occupancy of the component B on the fiber cross-sectional area as a result of the measurement, and the correlation is as follows.

As shown in FIG. 2, if the B component of the independent form is assumed to be in electrical parallel form, it is expressed by the formula of 1 / ρ = ω / ρ ₁ + ω / ρ _{2 and} the whole fiber under the condition of ρ ₂ ω ₁ > ρ ₁ ω ₂ The specific resistance of has the characteristic of logρ = logρ ₁ -logω ₁ .

Where ρ is the specific resistance of the whole fiber, ρ ₁ is the resistivity of the B part, ρ ₂ is the resistivity of the A part, ω ₁ is the weight fraction of the B part, and ω ₂ is the weight fraction of the A part. Although it is not exact coincidence, the larger the cross-sectional volume share of part B is, the lower the electrical resistivity tends to be. In view of the problems of the sacrificial property and the detention apparatus, the number of finely divided B components is 4-8 and 5%- It was confirmed that when forming in the range of 20% effectively had a 20% cross-sectional occupancy, there was a reduction effect of about 10 ³ -10 ⁵ ΩCm.

At this time, if the number of finely divided B components is 4 or less, the function as a medium polymer is lost.

In addition, when the B component is 5% or less of the total cross-sectional area, the antistatic effect is poor, and when it is 20% or more, the fiber formability is lowered.

The constituents of Part C include polyethylene, polyamide, and polyester with conductive bookkeeping fine particles in which titanium oxide and antimony oxide are coated with a tin compound on the surface of the inorganic particles mixed in a weight ratio of 20: 80-50: 50. The electrical resistivity of the C part itself is 10 ¹ -10 ² ΩCm when the inorganic conductive fine particles are added at 10% -35% based on the weight of the C part. The area occupied by spinning was 5% -10%.

If the cross-sectional area ratio is 5% or less, the desired antistatic effect cannot be obtained, and if it is 10% or more, the fiber formability is deteriorated.

At this time, if the addition amount of the inorganic conductive fine particles is 10% or less, the electroconductive performance is remarkably reduced, and if it is 35% or more, spinning becomes difficult. In addition, when the mixing ratio of titanium oxide and antimony oxide is outside the range of 20: 80-50: 50, the conductive performance is deteriorated.

The white conductive polyester fiber as shown in FIG. 4 prepared using the spinneret as shown in FIG. 3 using the ABC 3-component prepared as described above has the antistatic performance At the same time, the portion B, which acts as a medium polymer for the surplus charge, is weakened by the self-retained crystal water ion discharge to about 10 ⁷ -10 ¹⁰ ΩCm, and then the surplus charge is rapidly transferred to the C portion, which is caused by the corona discharge of the C portion. antistatic electrical resistivity of the total (除電) by being fibers is 10 ³ -10 ⁴ is electrically conductive and durable as to be ΩCm level is produced excellent white light-polyester fiber.

Hereinafter, the present invention will be described in detail with reference to Examples.

EXAMPLE

A conventional polyester polymer for fiber was used as component A, and 40% by weight of dimethyl telephthalate was melted for 60 minutes at 150 ° C. under a nitrogen stream, followed by mixing 30% by weight of ethylene glycol, and a small amount of tetrabutylene titanate was used as a catalyst. After the addition, the temperature was raised to 200 ° C, and the completion of the ester reaction was carried out, after adding 29% by weight of polyethylene glycol, a weight average molecular weight of 2000, 0.5% by weight of titanium oxide and a polymerization catalyst, an antioxidant, etc., 240 ° C and 0.4mmHg. After the reaction under the following three hours under reduced pressure to prepare a media polymer having an intrinsic viscosity of 1.04, electrical resistivity 10 ⁷ -10 ⁸ ΩCm with an average molecular weight of 150,000 level using B component, the surface was coated with a tin-based compound 1 Antimony oxide and titanium oxide having a pore size of 0.05-0.25㎛ were mixed at an intermediate ratio of 40:60, and the weight ratio of the conductive powder having a specific resistivity of 10-25ΩCm to the polyethylene resin was measured. After melt mixing at 50:50, it was prepared in pellets with electrical resistivity of 10 ¹ -10 ² ΩCm and used as C component. The resultant was stretched after spinning by a separate driven polymer feeding device and spinneret as shown in FIG. 75: 15: 10 with a cross section occupancy ratio (A: B: C) of 75: 15: 10, and 4 components of B with a spinning speed of 1,200 m / min and a drawing ratio of 2.94. 75 denier with an electrical resistivity of 5.7 × 10 ³ ΩCm A polyester-based conductive white long fiber of filament was prepared.

Claims (2)

In the composite conductive polyester fiber composed of three components of ABC, a conventional polyester resin is used as the component A, and the modified component has a process water content of 2-5% and an electrical resistivity of 10 ⁷ -10 ¹⁰ ΩCm as the component B. Using a polyester resin, 10-35% of fine powder mixed with titanium oxide and antimony oxide coated with a tin-based compound in a weight ratio of 20: 80-50: 50 is mixed as the C component. The white conductive fiber characterized by using the prepared polyester resin. The white conductive fiber according to claim 1, wherein component B is 5-20% of the total cross-sectional area, component C is 5-10% of the total cross-sectional area, and the number of finely divided B components is 4-8. .

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