KR20170135342A - Method for manufacturing high molecular weight polyethylene fiber and fiber manufactured by the same - Google Patents

Abstract

The present invention relates to a method of producing high-molecular-weight polyethylene fibers and, more specifically, to a method of producing high-molecular-weight polyethylene fibers, including: producing undrawn yarn by melt-spinning a raw material containing high-molecular-weight polyethylene at a temperature of 230 to 320C; and stretching the undrawn yarn. Accordingly, the present invention has a simple process due to use of a melt-spinning method, and not only has a small risk of environmental pollution, but also provides contact cold feeling when manufactured into clothes due to excellent thermal conductivity.

Description

METHOD FOR MANUFACTURING HIGH MOLECULAR WEIGHT POLYETHYLENE FIBER AND FIBER MANUFACTURED BY THE SAME Technical Field [1] The present invention relates to a high molecular weight polyethylene fiber,

The present invention relates to a process for producing high molecular weight polyethylene fibers.

In recent years, the world's textile demand has been changed to high-function, high-performance advanced high-tech fiber materials with various functions in general-purpose and industrial fibers for general clothing due to population growth and improvement in living standards.

Especially, in the fashion clothes and the technical textile products for daily life, it is an essential performance to provide a user with a function of keeping warm or cold, and a fiber having such performance has been actively developed.

Generally, the technology used for the fiber product that provides the user with the cold storage function is a technology that utilizes the thermal conductivity of the fiber material itself, the technology that controls the thermal conductivity of the fiber surface, and the technology that uses the latent heat generated by the evaporation of water . In particular, the contact cold feeling fiber using the thermal conductivity of the fiber material itself has been actively researched because it is advantageous to fabricate the fiber product by a relatively simple process as compared with the fibers using other techniques.

On the other hand, high molecular weight polyethylene (HMWPE) has been used in industrial applications requiring high strength due to its flexibility, water resistance, and chemical resistance. Recently, by using the excellent thermal conductivity of high molecular weight polyethylene, And the like, and also in the field of technical clothing and life-like technical textile in which contact cold feeling is required.

 However, the gel spinning method, which is mainly used for increasing the strength of the high molecular weight polyethylene filament, is economically disadvantageous in terms of environmental pollution due to the solvent used, additional cost for solvent recovery and purification, and high cost of the high molecular weight polyethylene filament It is not suitable for manufacturing, and the development of high molecular weight polyethylene fiber having excellent contact cold feeling function which satisfies the demand of the consumer so far is insufficient.

In this connection, Korean Patent Laid-Open Publication No. 2014-0075842 discloses a polyethylene fiber and a manufacturing method thereof, but fails to provide an alternative to the above-mentioned problem.

Korean Patent Publication No. 2014-0075842

It is an object of the present invention to provide a method for producing a high molecular weight polyethylene fiber which is simple in process and low in the risk of environmental pollution by using melt spinning instead of gel spinning.

It is an object of the present invention to provide a method for producing a high molecular weight polyethylene fiber excellent in thermal conductivity and excellent in contact cold feeling when manufactured into clothes.

1. melt spinning a raw material containing high molecular weight polyethylene at a temperature of 230 to 320 DEG C to produce an undrawn yarn; And stretching the non-drawn filament yarn.

2. The process of claim 1 wherein the melt spinning is carried out at a temperature of from 250 to 300 < 0 > C.

3. The method for producing a high molecular weight polyethylene fiber according to claim 1, further comprising cooling the undrawn yarn before the stretching step.

4. The method for producing a high molecular weight polyethylene filament according to 1 above, wherein said stretching is carried out in multiple stages

5. The method for producing a high molecular weight polyethylene fiber according to item 1 above, wherein the non-drawn filament is dipped in an emulsion solution in the filament drawing step.

6. A high molecular weight polyethylene fiber produced by the method of any one of the above 1 to 5.

7. The fabric of claim 6, wherein the fabric comprises the high molecular weight polyethylene fibers.

8. The fabric according to 6 above, wherein the fabric comprises 20 to 60% by weight of the high molecular weight polyethylene fibers.

The process for producing a high molecular weight polyethylene fiber of the present invention uses a melt spinning process, which is simple in process and low in the risk of environmental pollution.

The process for producing a high molecular weight polyethylene fiber of the present invention is capable of producing a high molecular weight polyethylene fiber having excellent thermal conductivity and excellent in contact cold feeling when manufactured into clothes.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic process diagram of a method for producing high molecular weight polyethylene fibers according to an embodiment of the present invention. FIG.
Figure 2 is a thermographic image of the fabric of an embodiment and a comparative example according to an embodiment of the present invention.

The present invention relates to a method for producing a high molecular weight polyethylene fiber, and more particularly, to a method for producing a high molecular weight polyethylene fiber by melt spinning a raw material containing high molecular weight polyethylene at a temperature of 230 to 320 ° C to produce an undrawn yarn; And a step of stretching the non-drawn filament yarn, thereby producing a high molecular weight polyethylene filament which is easy to manufacture and has a low risk of environmental pollution, And a manufacturing method thereof.

FIG. 1 schematically shows a process for producing a high molecular weight polyethylene fiber according to an embodiment of the present invention. Hereinafter, a method for producing high molecular weight polyethylene fibers according to one embodiment of the present invention will be described in detail with reference to the drawings.

The method for producing a high molecular weight polyethylene fiber according to an embodiment of the present invention is a method for producing a high molecular weight polyethylene fiber by melt spinning a raw material containing high molecular weight polyethylene at a temperature of 230 to 320 DEG C, .

High molecular weight polyethylene (HMWPE) as used herein refers to polyethylene having a weight average molecular weight of 100,000 to 150,000.

Generally, high molecular weight polyethylene fibers are mainly used in industrial fields requiring high strength due to their flexibility, water resistance, and chemical resistance, and a gel spinning method is mainly used as a manufacturing method thereof. However, since the gel spinning method is economically disadvantageous in terms of environmental pollution due to the solvent used and the additional cost of auxiliary facilities for solvent recovery and refining, and is not suitable for the production of high molecular weight polyethylene fibers for clothing, the high molecular weight polyethylene The fiber is manufactured by melt spinning.

The melt spinning method is a spinning method in which a melt of a chain-like polymer substance is pushed out from a small hole (spinneret) to cool and solidify into filaments. There is no need for a solvent or the like in comparison with the gel spinning method, There is no problem of environmental pollution caused by the use and recovery of the solvent, and it is possible to produce high molecular weight polyethylene fibers suitable for the production of clothes.

The melt spinning according to the invention is carried out at a temperature of 230 to 320 ° C. When the melt spinning is carried out at the above-mentioned temperature, the viscosity of the molten raw material can be kept low enough to be radiated through the spinneret, thereby making it possible to produce the high molecular weight polyethylene filament of the present invention. But may be carried out at a temperature of preferably 250 to 300 DEG C in view of performing more stable emission.

In the melt spinning according to the present invention, the cross section of the spinneret through which the raw material is melt-radiated is not particularly limited, and examples thereof include circular, C, W, flat, semicircular, oval, polygonal, It is preferable to use a C type, a W type, a flat type, a semicircular type, an elliptic type, a polygonal type, a mixed type thereof, and the like in order to further enhance the moving speed of moisture, , Or a mixed type thereof, more preferably a C type, a W type, a flat type, a mixed type thereof, or a mixed type thereof.

If necessary, the method for producing the high molecular weight polyethylene fiber of the present invention may further include cooling the undrawn yarn after the raw material is melt-spun as illustrated in FIG. 1 (b).

It is possible to produce a high molecular weight polyethylene fiber having more stable physical properties through cooling of the non-drawn yarn.

The cooling can be performed, for example, by applying cold wind to the unstirred yarn.

The cooling conditions are not particularly limited and can be, for example, from 5 to 50 DEG C for 0.01 to 1 second, preferably from 10 to 30 DEG C for from 0.06 to 0.6 second. In the above range, winding to be described later can be performed stably and efficiently, which is preferable.

In the case of cooling by applying cold air, the humidity of the cold air can be, for example, 40% or more, preferably 60% or more, and more specifically 60% to 95%.

Further, the method for producing the high molecular weight polyethylene fiber of the present invention includes the step of stretching the non-drawn filament as illustrated in Fig. 1 (c).

The ratio of stretching the undrawn yarn is not particularly limited and can be, for example, 5 to 20 times, and can be preferably 8 to 15 times in terms of preventing trimming and ensuring stable physical properties such as durability .

In addition, the stretching can be performed in multiple steps. In such a case, cutting prevention and process stability are superior. The stretching may be performed by, for example, stretching in two steps or three steps, but preferably in three steps, but is not limited thereto.

At the time of multi-stage stretching, the stretching may be performed such that the total stretching ratio obtained by multiplying the stretching ratio at each stage is the stretching ratio. For example, in the case of three-step stretching, stretching can be performed in the range of 1.5 to 2.5 times in the first step, 1.8 to 2.8 times in the second step and 3.8 to 4.8 times in the third step within the range satisfying the stretching ratio, , It can be stretched 1.8 to 2.2 times in the first stage, 2.1 to 2.5 times in the second stage, and 4.1 to 4.5 times in the third stage.

Further, the method for producing the high molecular weight polyethylene fiber of the present invention may include a step of relaxing the stretching of the drawn yarn after the stretching. This is to make the stretch yarn have a stable physical property, and the relaxation ratio is not particularly limited, and can be relaxed to, for example, 0.5% to 5% of the stretch ratio.

The method for producing the high molecular weight polyethylene fiber of the present invention may be accompanied by heat treatment in the stretching step.

The heat treatment may be performed, for example, by passing the undrawn yarn through a hot chamber during stretching, stretching it through a hot roller, or a combination thereof.

The heat treatment temperature may be, for example, 30 to 100 DEG C for a hot chamber, and 100 to 200 DEG C for a hot roller, but is not limited thereto.

If necessary, the method for producing a high molecular weight polyethylene fiber of the present invention may be a method of stretching an unstretched fiber soaked in an emulsion solution in the stretching step.

If the undrawn yarn is immersed in the emulsion solution in the stretching step, the stability of the fiber at the time of stretching and winding described later can be improved.

As the emulsion, an aqueous emulsion known in the art can be used without limitation.

The concentration of the emulsion in the emulsion solution according to the present invention is not particularly limited, and is, for example, 10 to 15% by weight. At this concentration, the undrawn yarn can be uniformly heat treated as a whole and stably stretched. If the concentration of the emulsion is less than 10% by weight, static electricity is likely to be generated on the fibers during winding and drawing, so that it is difficult to stably wind and stretch the fibers. If the emulsion concentration exceeds 15% by weight, the fibers may be excessively sticky.

Thereafter, the high molecular weight polyethylene filament obtained by the stretching can be wound. The winding speed is not particularly limited and may be set in consideration of the number of holes of the nipping, the diameter of the holes, and the cooling conditions.

The method for producing the high molecular weight polyethylene fiber can produce a high molecular weight polyethylene fiber suitable for a garment material while having a simple process, a low risk of environmental pollution, and excellent thermal conductivity.

The present invention also provides a high molecular weight polyethylene fiber produced by the process for producing the high molecular weight polyethylene fiber.

The high molecular weight polyethylene fiber produced by the above-mentioned method can be widely applied in the art and can be suitably used as a garment fiber due to its durability suitable for use as a garment material. In addition, since it is excellent in contact cold feeling due to its excellent thermal conductivity, it can be preferably used as high-function clothes.

 The high molecular weight polyethylene fibers of the present invention can have various cross-sections such as circular, C, W, flat, semicircular, elliptical, polygonal, mixed type thereof, mixed type thereof, It may preferably be of a C type, a W type, a flat type, a semicircular type, an elliptic type, a polygonal type, a mixed type thereof, or a mixed type thereof, more preferably C type, W type, Flat, a mixed type thereof, or a mixed type thereof.

The present invention also provides a fabric comprising the high molecular weight polyethylene fibers.

The fabric of the present invention is excellent in contact cold feeling, and can be applied to fashion garments and various technical textile fields for daily life which require contact cold feeling such as sportswear, mountain climbing clothes, and bedclothes.

If desired, the fabric of the present invention may contain materials known in the art in addition to the high molecular weight polyethylene fibers. For example, polyester, nylon, rayon, cotton ), Linen, and the like.

The content of the high molecular weight polyethylene fibers contained in the fabric of the present invention is not particularly limited, and for example, 20 to 60% by weight of high molecular weight polyethylene fibers may be contained. In the above range, it is possible to produce a fabric having excellent contact cold feeling without deteriorating the properties of the material to be combined with the high molecular weight polyethylene fiber.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.

Examples and Comparative Examples

Example

1. Preparation of High Molecular Weight Polyethylene Fibers

High molecular weight polyethylene having a weight average molecular weight of 100,000 was melted at 275 DEG C and melt-spun through a spinneret. Thereafter, cold air with a relative humidity of 60% at 15.degree. C. was added to the radiated undoped gum for 0.6 seconds and then cooled, immersed in a 15% by weight aqueous emulsion solution, And then stretched to a draw ratio of 19.8 times.

Stretching was carried out through a hot roller (125 캜) and a drawing roller (150 캜), and passed through a hot chamber (70 캜) during drawing.

Thereafter, the drawn yarn was relaxed to 3% of the stretching ratio to produce a high molecular weight polyethylene fiber.

2. Fabrication of Fabrics Containing High Molecular Weight Polyethylene Fibers

The high molecular weight polyethylene and the cotton yarn prepared by the above were combined at a weight ratio of 50:50, and the fabric was weighed at a weight of 215 g per square meter using a 32 gauge circular knitting machine. The impurities were removed by refining, To prepare fabric of Examples.

Comparative Example

1. Comparative Example 1 (Preparation of PET / Xylitol Fabric)

Polyethyleneterephthalate (PET) fiber was woven in the same manner as in Example, and xylitol, which is widely used in the production of cold-feeling fibers, was treated to prepare the fabric of Comparative Example 1.

2. Comparative Example 2 (Production of PET / Rayon / Xylitol Fabric)

Polyethylene terephthalate fibers and rayon were combined at a weight ratio of 50:50, and woven in the same manner as in Example, and treated with xylitol to prepare a fabric of Comparative Example 2.

Experimental Example

1. Thermal imaging

Under the experimental conditions at room temperature (20 ° C), infrared thermograms were taken using the infrared thermography apparatus in a state in which the hands of the experimenter were in contact with the fabric prepared by the above Examples and Comparative Examples for 5 minutes.

Thermal images of Examples and Comparative Examples are shown in Fig.

2. Cold feeling measurement

A cooling feeling measurement experiment was commissioned to the Korea Institute of Medical Testing (KATRI), and cold sensation measurement experiments of the above Examples and Comparative Examples were carried out. The experimental apparatus used was KES-F7 (Thermo labo II), the measurement environment was 20 ± 2 ° C, the humidity was 65 ± 2%, and the temperature difference between the apparatus and the sample was 10 ° C. The Qmax value Were measured. The Qmax value refers to the peak value of the heat flow which is conducted when the sample is brought into contact with the apparatus, and the predetermined heat accumulated in the heat plate in the experimental apparatus is conducted to the sample surface. In other words, the sample simulates the body temperature taken by the sample when the sample comes into contact with the apparatus. The larger the Qmax value is, the larger the body temperature to be taken,

The Qmax values of Examples and Comparative Examples are shown in Table 1.

division fiber Qmax (J / cm < 2 > / s) Example HMWPE / Cotton 0.101 Comparative Example 1 PET / Xylitol 0.058 Comparative Example 2 PET / Rayon / Xylitol 0.075

First, as shown in FIG. 2, the body temperature of a hand in contact with the fabric of the example was measured to be 28.8 캜 lower than that of Comparative Examples 1 and 2, and it was confirmed that the contact cold feeling of the fabric of Example was excellent .

In addition, when the results of the cold sensation measurement are examined, it can be confirmed that the fabric of the embodiment has a Qmax value that is better than that of the fabric of the comparative example. Therefore, it can be seen that the high molecular weight polyethylene fiber of the present invention has excellent thermal conductivity and thus exhibits an excellent contact cold feeling property in the production of clothes.

Claims (8)

Melt spinning a raw material containing high molecular weight polyethylene at a temperature of 230 to 320 DEG C to produce an undrawn yarn; And
And stretching the non-drawn filament yarn.
The process according to claim 1, wherein the melt spinning is carried out at a temperature of from 250 to 300 캜.
The method according to claim 1, further comprising cooling the undrawn yarn before the stretching step.
The method according to claim 1, wherein the stretching is performed in multiple stages.
The method of producing a high molecular weight polyethylene fiber according to claim 1, wherein the non-drawn filament is dipped in an emulsion solution in the filament drawing step.
A high molecular weight polyethylene fiber produced by the manufacturing method according to any one of claims 1 to 5.
7. The fabric of claim 6 comprising the high molecular weight polyethylene fibers.
7. The fabric according to claim 6, wherein the high molecular weight polyethylene fiber comprises 20 to 60% by weight.

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