KR20090131880A - Compositions of biodegradable flexible polylactic acid resin and preparation of fiber for a artificial wig using thereof - Google Patents

Abstract

PURPOSE: A biodegradable flexible polylactic acid resin composition is provided to ensure excellent processability, fire retardant characteristic, antistatic property, curling property and biodegradation property and to implement excellent style and natural fashion. CONSTITUTION: A biodegradable flexible polylactic acid resin composition comprises a polylatic acid resin 100.0 parts by weight and a polylactic acid oligomer 5-30 parts by weight. The average molecular weight of the polylactic acid oligomer is 70-400. The composition further includes a phosphorous-based flame retardant 3-10 weight% based on the total weight.

Description

COMPOSITIONS OF BIODEGRADABLE FLEXIBLE POLYLACTIC ACID RESIN AND PREPARATION OF FIBER FOR A ARTIFICIAL WIG USING THEREOF}

The present invention relates to a biodegradable soft polylactic acid resin composition, and more particularly, to a biodegradable soft polylac including 5-30 parts by weight of a polylactic acid oligomer relative to 100 parts by weight of a polylactic acid (PLA) resin. It relates to a tic acid resin composition.

In general, synthetic hair, which is a raw material of wigs, is ultimately attracted as a good material when it exhibits mechanical properties, gloss, and workability similar to human hair, and for this purpose, light, flame retardancy, and antistatic properties are required. Sex, curl ability, color similar to human hair, style stability, and variability in style should be provided.

Until now, resins such as Acryl (acrylic) fiber, PVC (Poly Vynil Cloride) fiber, Nylon (nylon), and Poly propylene (PP fiber) are mainly used to satisfy these properties. It is an acrylic fiber which has the closest structure to. However, these acrylic fibers also have inherent low glass transition temperature (T _g : glass transition tempreture), which results in a poor curling ability when used in combination with human hair, and has many problems such as deterioration in style stability and thermal stability.

Accordingly, polyester resins have been developed as a substitute for acrylic fibers, and synthetic hairs made of polyester resins have excellent curling ability, style stability, and style variability due to high glass transition temperature. It is evaluated as a superior material to artificial hair.

However, polyester resins have a high elastic modulus, which makes it difficult to express a natural touch, and due to low moisture content, they generate a lot of static electricity, causing entanglement easily. It is difficult and expensive.

However, the most important problem among these artificial wig materials is that the products are not biodegradable in natural state after wig use, so they are incinerated at high temperature or disposed of in landfill, and these chemicals emit a large amount of environmental hormones during incineration. In case of reclamation or landfilling, it causes many environmental problems such as decomposition after more than 100 years.

The present invention is to solve the conventional problems, the object of the present invention relates to a biodegradable soft polylactic acid resin composition which is biodegradable and has high characteristics as an environment-friendly material for artificial wigs.

Another object of the present invention relates to a method for manufacturing an artificial wig yarn and to an artificial wig thereby.

One aspect of the invention relates to a polylactic acid composition comprising 5-30 parts by weight of a polylactic acid oligomer relative to 100 parts by weight of a poly latic acidm PLA resin.

Another aspect of the present invention is to prepare a polylactic acid composition by adding 5-30 parts by weight of polylactic acid oligomer to 100 parts by weight of poly latic acid (PLA) resin 2-5 after melt spinning the composition : Relates to a method for producing a synthetic wig yarn comprising the step of multi-stretching the heat at a magnification of 1.

Another aspect of the present invention relates to yarns and artificial wigs for artificial wigs made of the biodegradable polylactic acid resin.

The biodegradable soft polylactic acid resin composition of the present invention has excellent processability, flame retardancy, antistatic property, curling property, biodegradability, and enables excellent style and natural fashion production. It can be made of artificial wig yarn that can reduce environmental pollution.

Hereinafter, the present invention will be described in detail.

Biodegradable soft polylactic acid resin composition according to the present invention is characterized in that it comprises 5-30 parts by weight of polylactic acid oligomer relative to 100 parts by weight of polylactic acid (poly latic acidm PLA) resin.

The polylactic acid (PLA) resin may be used regardless of the production company (Cargill Dow Polymers, Mitsui Chemical, Chronopol or Dhimadzu, etc.). It is preferable that the weight average molecular weights of the said polylactic acid resin are 5,000-500,000.

Currently, polylactic acid (PLA) resin is one of various biodegradable resins and is produced by several companies around the world, such as Cargill-Dow Polymer, Chronopol, and Mitsui Chemical in the United States. It is supplied. Polylactic acid (PLA) resin has been studied in material engineering as it is or by adding a few harmful substances to the human body. It is also used as a scaffold in tissue engineering. 2004 May; 25 (10): 1901-9., Avd Exp Med Biol, 2003; 534: 191-9., Ann NY Acad Sci. 2002 Oct; 974: 556-64. It is a biodegradable resin that possesses several features from a commercial point of view, not the same special field.

First, the general process for obtaining PLA resin using biodegradable artificial wigs is as follows.

 Corn-> Starch-> Sugar-> Lactic Acid Fermentation-> Lactic Acid-> PLA

       Purified Glycation Fermentation Polymerization

The PLA resin is divided into L-type and D-type stereoisomer as stereoisomers, and it is preferable to use L-type PLA resin (PLLA) having relatively good elongation (Orientation).

Cyclization of the Lactic Acid in the above process (ringing) to produce Lactide and ring-opening polymerization it can be produced PLLA (Poly Laevo enantiomer Lactic Acid).

The PLLA produced by ring-opening polymerization is a crystalline polymer, which is difficult to have a high draw ratio, but has a characteristic of excellent mechanical properties after stretching, and its melting point (Tm) is 180 ° C., which is higher than other eco-friendly materials. It is able to maintain high quality and excellent workability under heat processing conditions such as curling, which is conducted to diversify and diversify styling.

Table 1 compares the physicochemical properties of the PLA material compared to the PET material which is currently used as a material for artificial wigs.

Referring to Table 1, PLA (PLLA) fiber has a good mechanical strength similar to that of PET, has high thermal stability compared to other biodegradable materials, and has a low Young's modulus compared to PET, which is suitable for realizing styling of artificial hair. Since it can represent an excellent performance when manufacturing the yarn for artificial wigs.

The composition comprises 5-30 parts by weight of polylactic acid oligomer relative to 100 parts by weight of poly latic acidm PLA resin.

Polylactic acid resin is a crystalline polymer, and its elongation is about 3% in the natural state, but when the PLLA oligomer is used as a plasticizer, the elongation can be increased by 200% or more. That is, since the PLA oligomer used at this time has a low melting point (Tm) with low molecular weight PLA and exhibits amorphousness, these oligomers may be mixed with high molecular weight crystalline PLA to increase amorphousness and increase the draw ratio.

PLA oligomer used in the present invention may be represented by the following formula (1).

Wherein n is in the range of 2 to 10, preferably 2 to 5.

There is no restriction on the polylactic acid oligomer, but the weight average molecular weight is preferably 50 to 800, preferably 70 to 400.

If the polylactic acid oligomer is less than 5 parts by weight, there is a limit to increase the draw ratio. If the polylactic acid oligomer exceeds 30 parts by weight, the draw ratio may be increased but there is a limit to increase the mechanical strength.

The composition may further add 3-10% by weight of the phosphorus-based flame retardant relative to the total weight. The phosphorus-based flame retardant is to impart the flame retardancy required when using the yarn, the organic (mainly halogen-based compound) flame retardant is excellent in flame retardant performance, but in the process of refraining from use due to suspected carcinogens in the present invention mainly phosphorus (inorganic eco-friendly flame retardant) P) flame retardant was used.

If the phosphorus-based flame retardant is used at less than 3% by weight, the oxygen limit index (LOI) value is 22 or less, which is not suitable for the application of artificial wig yarn and is more than 10% by weight. Since the yarn yield is lowered during the manufacturing process, there is a problem in that weaving performance is lowered, and thus a high yield of radiation cannot be guaranteed.

The composition may further comprise a color master batch to implement the color of the yarn for the artificial wig.

In addition, the composition may suitably include a pigment, a dispersant, a heat stabilizer and the like as an additive.

 In another aspect, the method for manufacturing a synthetic wig yarn according to the present invention is a step of preparing a polylactic acid composition by adding 5-30 parts by weight of polylactic acid oligomer to 100 parts by weight of poly latic acidm PLA resin. And multistage thermal stretching at a magnification of 2-5: 1 after melt spinning the composition.

Since components and contents of the polylactic acid composition have been described above, a description thereof will be omitted.

The preparing of the polylactic acid composition may be a step of blending the polylactic acid resin and the polylactic acid oligomer by stirring while maintaining the temperature of the composition at 80-120 ° C.

After adding high molecular weight PLLA, low molecular weight PLA oligomer, reaction catalyst and various stabilizers to a stainless reaction vessel equipped with a stirrer and stirring while maintaining the temperature at 80-120 ° C, the PLLA polymer and PLA oligomer are blended and draw ratio is increased. A mixture that can be increased can be prepared, and the stretchable ratio of the mixture can be adjusted up to 100-200% according to the stirring temperature and the dosage of the oligomer.

The multi-stage hot drawing step is a multi-stage hot drawing at a magnification of 2 to 5: 1 after melt spinning the composition.

In general, the crystalline polymer undergoes a quenching process immediately after extrusion in the melt spinning process. As the crystal grows and crystallizes rapidly during this process, the crystalline polymer is already before the process of stretching after cooling. As crystals grow a lot, it is very difficult to increase the draw ratio. However, due to the characteristics of the yarn for artificial wigs that require high mechanical strength, the mechanical strength can be obtained only by stretching at a high magnification, so there is a conflict between the properties of the material and the required physical properties. use.

That is, unlike other materials manufactured by one-stage stretching, in the present invention, the stretching ratio is appropriately distributed to perform two to five stages of stretching, and preferably four to five stages of stretching to obtain higher stretching efficiency. have.

In addition, by using a hot godet roller (Hot godet roller) to increase the mobility (mobilrity) of the molecules at the time of stretching, it is desirable to overcome the resistance of the molecules due to the multi-stage stretching.

In another aspect, the invention relates to yarns for artificial wigs made from biodegradable soft polylactic acid resin compositions.

It is preferable that the thickness of the artificial wig yarn is 10 to 100 den based on mono denier. It relates to an artificial wig made by multiple bundles of yarn for the artificial wig.

When the artificial wig yarn is bundled (TOW) and put into the artificial wig manufacturing process, the heat setting performance is excellent, and it is easy to add fashion performance such as curling property or permanent. Difficult problems in the artificial wig processing process of materials (PET, PP, Nylon, PVC, Acryl, etc.) can be easily solved, and fashion wigs can be manufactured for various purposes.

Hereinafter, the present invention will be described in detail with reference to Examples, but the features of the present invention are not limited to Examples.

Example 1

20 kg of PLA oligomer (Mitsubishi) is mixed with 100 kg of high molecular weight PLA (PLA-0010, MW 10,000, WAKE PURE CHEMICAL), mixed in a stainless stirrer heated to 120 ° C. for 1 hour to form a mixture, and then the temperature of the stirrer After lowering the temperature to 80 ℃ put 5kg of the color master batch prepared for the purpose of coloring, 5kg phosphorus-based flame retardant was added thereto and stirred for 1 hour to prepare a biodegradable soft polylactic acid resin composition. Subsequently, the composition was placed in an extruder and extruded into a spinning die of 7000 den / 50fila at a temperature of 230 ° C., followed by cooling through an air-cooled quenching duct maintained at a temperature of 15 ° C. to partially crystallize (Partitaly). After winding up at 1000m / min at No.1 Godet roller (stretched roller) maintained at 80 ℃, hand over to 1200m / min at No.2 roller maintained at 90 ℃ and then maintained at 90 ℃ again. After passing through 1400m / min speed in Laura, it is transferred to 1600m / min in 4th roller which is kept at 100 ℃ and finally passed in 2000m / min by 5th roller which is maintained at 120 ℃. Drawing of 200% occurred and finally wound at 2000m / min in the final winding device to obtain 3500den / 50fila (Mono 70den) artificial wig yarn with excellent mechanical strength and improved thermal stability.

Example  2

Except for producing a biodegradable soft polylactic acid resin composition using a content of PLA oligomer 10kg compared to PLA resin, a yarn for artificial wig was obtained in the same manner as in Example 1.

Example 3

A yarn for artificial wigs was obtained in the same manner as in Example 1 except that the phosphorus-based flame retardant was 10 kg.

Example  4

A yarn for artificial wigs was obtained in the same manner as in Example 1 except that the content of the phosphorus-based flame retardant was 12 kg.

Example  5

Except for producing a biodegradable soft polylactic acid resin composition using a content of PLA oligomer 30kg compared to PLLA resin, a yarn for artificial wig was obtained in the same manner as in Example 1.

Comparative example  One

5 kg of masterbatch prepared for the purpose of colorant was added to 100 kg of PET having an intrinsic viscosity of 0.65, 5 kg of phosphorus-based flame retardant was added, and then extruded into an extruder. After stretching, the draw roller was stretched at a draw ratio of 4.5: 1 through four draw rollers, and then wound to prepare a PET artificial wig yarn.

Comparative example  2

After preparing a polypropylene resin of MI (melt index) 25, prepare a spinning raw material by mixing 5 kg of coloring masterbatch and 5 kg of phosphorus flame retardant as in Comparative Example 1, and then using a circular die as in Comparative Example 1. After passing through to prepare an unstretched yarn, it was stretched at a ratio of 4: 1 through four drawn rollers, and then wound to prepare a yarn for a PP artificial wig.

Experimental Example

The workability, flame retardancy, antistatic property, curling property, biodegradability, etc. of the artificial wig yarn prepared according to the above Examples and Comparative Examples were measured, and the results are shown in Table 2.

Artificial wigs made of eco-friendly corn PLA fiber according to the present invention from the results of Table 2, if properly prepared by adjusting the mixing ratio of the oligomers, and mixing the phosphorus-based flame retardant as well as excellent workability, flame retardancy, antistatic properties, curling It is possible to produce a fiber having excellent properties and to produce an environmentally friendly artificial wig yarn having excellent biodegradability.

Claims (9)

A biodegradable soft polylactic acid resin composition comprising 5-30 parts by weight of a polylactic acid oligomer relative to 100 parts by weight of a poly latic acidm PLA resin. The biodegradable soft polylactic acid resin composition according to claim 1, wherein the polylactic acid oligomer has a weight average molecular weight of 70 to 400. The biodegradable soft polylactic acid resin composition according to claim 1, wherein the composition further comprises 3-10% by weight of a phosphorus-based flame retardant based on the total weight. Preparing a polylactic acid composition by adding 5-30 parts by weight of a polylactic acid oligomer to 100 parts by weight of a polylactic acid (PLA) resin, and multistage at a magnification of 2 to 5: 1 after melt spinning the composition. Method of producing a synthetic wig yarn, characterized in that it comprises a step of hot stretching. The method of claim 4, wherein the preparing of the polylactic acid composition comprises mixing the polylactic acid resin and the polylactic acid oligomer by stirring while maintaining the temperature of the composition at 80-120 ° C. How to make yarn for wigs. The method of claim 4, wherein the multi-stage hot draw ratio is 4 to 5: 1, and a hot goet roller is used as the stretching roller. Yarn for artificial wigs made of a biodegradable soft polylactic acid resin composition according to any one of claims 1 to 3. 8. The artificial wig yarn according to claim 7, wherein the thickness of the artificial wig yarn is 10 to 100 den based on a mono denier. An artificial wig made of several bundles of artificial wig yarns according to claim 7.