KR20100097486A - Biodegradable fiber and preparing thereof, nonwoven made of them - Google Patents

Abstract

PURPOSE: A biodegradable fiber, a manufacturing method thereof, and a non-woven fabric manufactured therefrom are provided to secure the improved texture, brittle property, elongation rate, and dyeability. CONSTITUTION: A manufacturing method of a biodegradable fiber comprises the following: forming a mixture by mix-melting 50~92wt% of polylactic acid resin, 7~45wt% of PBS system resin, and 1~5wt% of inorganic material; spinning the mixture in 180~250deg C to form an undrawn yarn; extending the undrawn yarn at the elongation ratio of 1.2~2.5; crimping the extended yarn; attaching a spinning emulsion to the crimped extended yarn; and heat-setting the extended yarn and cutting into a constant length.

Description

Biodegradable fiber and manufacturing method thereof, nonwoven fabric produced therefrom {Biodegradable fiber and preparing honey, nonwoven made of them}

The present invention relates to a biodegradable fiber, and more particularly to a biodegradable fiber made from aliphatic polyester which is a biodegradable polymer and a method for producing the same, and a nonwoven fabric prepared therefrom.

In accordance with the times of environmental pollution prevention, the importance of degradable polymers has been fully recognized. The environmental pollution problem caused by the disposal of industrial and household polymers has been a major obstacle to the polymer industry, which has been recognized for its durability. Academia and industry have developed and commercialized environmentally degradable polymers to solve these problems. The country has legally mandated the use of these environmentally degradable polymers.

Synthetic polymers used for biodegradability include aliphatic polyester (AP) and polyglycolic acid (PGA), which are represented by polycarprolacton (PCL), polylactic acid (PLA). And the like are relatively excellent in physical properties.

Among these, aliphatic polyester polymers (PLA, PCL, PBS / PBSA / PBAT, etc.) have been studied the most because of their excellent processability and easy control of decomposition properties, especially in the case of polylactic acid (PLA). It is forming a market of 10,000 tons, and its application range is extended to fields where general plastics such as food packaging materials, containers, and electronics cases were used. To date, the main use of PLA resins is disposable products utilizing the biodegradable properties of PLA, such as food containers, wraps, films and the like. PLA is currently being produced by Natureworks in the US and Toyota in Japan.

However, existing PLA resin is easily damaged in the case of thin film products due to lack of moldability, mechanical strength, heat resistance, and low temperature resistance, there is a problem that deformation occurs in the shape of the molded product when the external temperature rises above 60 ℃.

Japanese Laid-Open Patent Nos. 2005-200517, 2005-220177 and 2005-336220 disclose a technique of mixing glass fibers to improve heat resistance and mechanical strength at the same time when using PLA resin, but the glass fibers are discarded. There is a disadvantage that it is not biodegradable after.

In addition, Korean Patent No. 854168 discloses a PLA resin having a terminal hydroxyl group or a carboxylic acid group or having both a terminal hydroxyl group and a carboxylic acid group, and an acrylate polymer or copolymer comprising an average of about 2 to about 15 free epoxide groups per molecule; A melt-processable PLA resin comprising long-chain molecules comprising the reaction product of is disclosed. However, the fiber produced using the PLA resin prepared therefrom has a drawback that it is not brittle and can not be used for a variety of low elongation characteristics.

Therefore, it is desirable to develop biodegradable fibers and nonwoven fabrics having improved biodegradability, such as PLA resin, which is a biodegradable resin, and improved physical properties and spinning conditions.

An object of the present invention to solve the above problems is to provide a fiber excellent in melt extrusion spinning.

Another object of the present invention is to provide a biodegradable fiber with improved elongation and improved feel as compared to a fiber made of a conventional polylactic acid resin.

It is another object of the present invention to provide a biodegradable fiber and a nonwoven fabric prepared therefrom having improved brittle characteristics, dyeability and thermal bonding as compared to general polylactic acid resin fibers.

In order to achieve the above object, the present invention is a biodegradable fiber, polylactic acid (PLA) resin, PBS-based resins and inorganic materials composed of 50 to 92% by weight, 7 to 45% by weight and 1 to 5% by weight, respectively Provide biodegradable fibers.

The present invention also provides a biodegradable fiber, characterized in that the spinning temperature is made at 180 to 250 ℃.

In addition, the present invention is a biodegradable fiber, characterized in that the melt index of the polylactic acid (PLA) resin is 10 to 50g / 10min (230 ℃, load of 2.16kg), the melting point is 145 to 230 ℃ measured by DSC to provide.

In another aspect, the present invention is a biodegradable, characterized in that the PBS resin is at least one selected from the group consisting of PBS (Polybutylene Succinate), PBSA (Polybutylene Succinate-co-adipate) or PBSF (Polybutylene succinate fumaric) or a mixture thereof Provide fiber.

In another aspect, the present invention provides a biodegradable fiber, characterized in that the inorganic material is at least one selected from the group consisting of mica, gold mica, barium sulfate, titanium dioxide, talc (Talc) and calcium carbonate (CaCO ₃ ).

In another aspect, the present invention provides a biodegradable fiber, characterized in that the MIt value of the mixture of the molten polylactic acid (PLA) resin, PBS-based resin and the inorganic mixture is 1 to 5.

In addition, the present invention is a method for producing a biodegradable fiber, the polylactic acid (PLA) resin, PBS resin and inorganic materials by mixing and melting 50 to 92% by weight, 7 to 45% by weight and 1 to 5% by weight, respectively, the mixture Forming; Spinning the mixture at a temperature of 180 to 250 ° C. to produce undrawn yarn; Drawing the undrawn yarn at a draw ratio of 1.2 to 2.5; Crimping step for imparting crimp to the stretched stretched yarn; Attaching the radioemulsion agent to the surface of the crimped stretched yarn after imparting said lymph; And heat-setting the drawn yarn to which the spinning oil is attached, and then cutting the fiber into fibers of a predetermined length.

In addition, the present invention is a biodegradable fiber, characterized in that the melt index of the polylactic acid (PLA) resin is 10 to 50g / 10min (230 ℃, load of 2.16kg), the melting point is 145 to 230 ℃ measured by DSC It provides a manufacturing method.

In another aspect, the present invention is a biodegradable, characterized in that the PBS resin is at least one selected from the group consisting of PBS (Polybutylene Succinate), PBSA (Polybutylene Succinate-co-adipate) or PBSF (Polybutylene succinate fumaric) or a mixture thereof It provides a method for producing a fiber.

In another aspect, the present invention provides a method for producing a biodegradable fiber, characterized in that the inorganic material is at least one selected from the group consisting of mica, gold mica, barium sulfate, titanium dioxide, talc (Talc) and calcium carbonate (CaCO ₃ ). do.

In another aspect, the present invention provides a method for producing a biodegradable fiber that is hot-air dried at a hot air temperature of 60 ℃ ~ 100 ℃ in direct and indirect contact with the fiber at the time of heat setting the yarn.

Also provided is a biodegradable nonwoven fabric prepared using the biodegradable fibers according to the present invention.

Biodegradable fibers and nonwovens according to the present invention has a degree of biodegradation suitable for environmental standards.

In addition, the biodegradable fiber according to the present invention has an excellent melt extrusion spinning property during spinning.

In addition, the biodegradable fiber according to the present invention is applicable to all applications in which general synthetic fibers are used, and has a harmless effect on the human body.

In addition, the biodegradable fiber according to the present invention and a method for producing the same have an effect of improving elongation and improving the touch as compared to a fiber made of a general polylactic acid resin.

In addition, the biodegradable fiber according to the present invention and the nonwoven fabric prepared therefrom have an effect of improving brittle characteristics and thermal bonding as compared to general polylactic acid resin fibers.

In addition, the biodegradable fiber and the nonwoven fabric prepared therefrom according to the present invention have improved dyeing properties as compared to general polylactic acid resin fibers, thereby reducing the shrinkage phenomenon and improving the dyeing property during high temperature bathing.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

"MIt" used in the present specification is defined as a value obtained by dividing the melt index (MI-230) measured at 230 ° C by the melt index (MI-190) measured at 190 ° C.

In the present technology, polylactic acid (PLA) resin refers to the entire polymer composed of lactic acid (Lactic acid) as a monomer, and PLA resin according to the isomer D-Lactide, L-Lactide content and arrangement (random copolymerization, block copolymerization) Thermal and physical properties may vary.

In the biodegradable fiber according to the present invention, as the biodegradable resin, polylactic acid (PLA) resin, PBS resin and inorganic materials are mixed and melted to form a mixture, and the mixture is spun to prepare fibers.

The melt index (MI) of the PLA resin is preferably 10 to 50 g / 10 min (230 ° C., 2.16 kg load), and the melting point (Tm) measured by DSC is preferably 145 to 230 ° C. In addition, the melt index of the PBS-based resin is preferably 1 to 20g / 10min (190 ℃, 2.16kg load). As the melt index is lower, the stiffness and low elongation of the fiber can be imparted, but since the viscosity is lowered, the workability becomes worse. If the melt index is too high, the rigidity of the fiber is not only lowered, but the spinning is difficult.

The PBS-based resin is preferably melted alone or mixed with PBS (Polybutylene Succinate), PBSA (Polybutylene Succinate-co-adipate) or PBSF (Polybutylene succinate fumaric).

When the mixture is melted by injecting inorganic materials during melting, one or more inorganic particles such as mica, gold mica, barium sulfate, titanium dioxide, talc and calcium carbonate (CaCO ₃ ) may be mixed. When the inorganic material is mixed to produce a fiber, there is an effect of controlling the filler or crystallization.

The ratio of the mixture at the time of melting the mixture is 50 to 92% by weight, 7 to 45% by weight and 1 to 5% by weight of the polylactic acid (PLA) resin, PBS-based resin and inorganic. Fibers produced in the above range is characterized by excellent physical properties and carding properties when manufacturing nonwoven fabrics. When the PLA resin is mixed below the above range, the elongation increases, and when the nonwoven fabric is manufactured, breakage occurs during carding. When the PBS-based resin is below the above range, the radiation is poor, making it difficult to manufacture the fiber or the nonwoven thermal. Bonding force is lowered when bonding, and there is a problem in that shrinkage phenomenon occurs during high temperature bath dyeing.

In this specification, the MIt value is defined as a value obtained by dividing the melt index (MI-230) measured at 230 ° C. by the melt index (MI-190) measured at 190 ° C. (“MIt = (MI-230) ÷ (MI-190 ) "), The MIt value of the resin in which the PLA, PBS-based and inorganic materials of the present invention are mixed is preferably 5 or less, and more preferably 1 to 5. The MIt value is a self index that can represent the thermal stability of the polymer during fiber spinning, the lower the MIt value, the more excellent the thermal stability. When the MIt value of the mixed resin is within the above range, there is a feature that is excellent in thermal stability.

Figure 1 shows a manufacturing process of the biodegradable fiber according to an embodiment of the present invention.

First, polylactic acid (PLA) resin, PBS resin and inorganic materials are mixed and melted at 50 to 92% by weight, 7 to 45% by weight and 1 to 5% by weight, respectively, to form a mixture. Next, the mixture is spun at 180 to 250 ° C. and stretched at a draw ratio of 1.2 to 2.5. In order to increase the magnification of the stretching, the stretching may be performed in a solution of multistage stretching (3-4) and bath stretching (60-100 ° C.). When stretching as described above, the stretching may be performed stably without cutting.

In the method for producing a biodegradable fiber of the present invention, it can be divided into one step equipment and two step equipment with respect to the spinning and stretching step. The biodegradable fiber of the present invention can be produced in two equipments, and has the following physical and physical properties.

One-step facility is a facility consisting of a series of processes of spinning and stretching, and the process of quenching the polymer discharged through the spinneret (cooling air of 10 ~ 50m / sec), and the spinning speed is 40 to slower than the two-step facility. It is characterized by 300 m / min. Low spinning speed and quenching of molten polymer discharged through spinneret resulted in low crystallization and spinning orientation of fiber produced by two-step equipment. Compared with the non-drawn yarn manufactured by the present invention, the tensile strength is low and the elongation tends to be high.

The two-step facility is divided into two stages of spinning and stretching, and it is a step of slowly cooling (1-4m / sec cooling air) the polymer discharged through the spinneret, and the spinning speed is 1000 to 2500m / faster than the one-step facility. min is characteristic. The spin crystallization and spinning orientation of the fiber produced by high cooling rate and slow cooling of the molten polymer discharged through the spinneret is higher than that of the one-step facility. Tensile strength and elongation tend to be higher than gentleman's.

After the polymer is stretched and crimped in a crimper, the spinning oil is attached to the fiber surface, and the liquid resin containing the spinning emulsion is dipped or sprayed. The spinning emulsion used in the present invention is not particularly limited, and the hydrophilic or hydrophobic emulsion used in general polypropylene fiber production is used. The amount of the spinning oil used is preferably to attach the spinning oil to the fiber surface so that 0.3 to 0.5 parts by weight based on 100 parts by weight of the total fiber.

After heat-setting the fiber with the spinning oil attached directly or indirectly at a hot air temperature of 60 to 100 ° C. for about 8 to 12 minutes, the fiber is cut to have a length of 3 to 100 mm. It can manufacture.

The biodegradable fiber produced by the above method can be applied to all applications in which thermoplastic synthetic fibers (PP, PET, Nylon, etc.) are used. For example, it can be used as automotive interior materials such as car trims, air cleaners, or quilts or stuffed cotton pads, which are completely biodegradable, which has advantages of preventing environmental pollution and harmless components.

In addition, the biodegradable fibers produced by the present invention may be made of various types of nonwoven fabrics such as needle punching, spun lacing, thermal bonding, airlaid, chemical bonds and their composite processing.

As an embodiment of the present invention, the thermal bond processing for manufacturing the nonwoven fabric may be performed using a calender bonding method.

In the calender bonding method, the non-woven fabric may be manufactured by thermally fusion between the fibers while carding the fibers while the web laminated on the conveyor passes between two hot rolls set at 90 to 130 ° C.

In the present invention, the thermal bond non-woven fabric was manufactured through a pilot calender bonding facility, and the hot roll temperature of hot roll was the most favorable for the non-woven fabric production speed, the shape of the embossed pattern of the roll, the difference between the roll setting temperature and the surface temperature, and the like. This is a relative result rather than an absolute result as it may vary depending on the production and equipment conditions of the calender bonding method and the fineness of the fibers used as raw materials.

Hereinafter, the embodiment and the biodegradation measurement of the present invention will be described in detail. The conditions and test results of each Example and Comparative Examples can be summarized in Table 1 below.

Example 1

(Production of Biodegradable Fibers)

PLA resin (2002D) was mixed with white mica in PBS resin and inorganic nanoparticles. The weight ratio of PLA resin (2002D), PBS resin and white mica was mixed and melted at 70%, 25% and 5% by weight. Undrawn yarn was prepared by spinning at a spinning temperature of 250 ° C. and a spinning speed of 40 m / min in a one-step spinning facility. The unstretched yarn is drawn at a draw ratio of 1.4 and a preheating temperature of 40 ° C. to impart crimping in the crimper, and spray the liquid resin containing the spinning emulsion in an amount of 0.5 parts by weight based on 100 parts by weight of the total fiber. Attach the spinning oil to the fiber surface as much as possible. The biodegradable fiber having the spinning emulsion adhered to the fiber surface was heat-set at a temperature of 70 ° C. for 10 minutes, and cut to a length of 64 mm to prepare a final fiber fineness of 4.0 to 6.0 denier.

(Manufacture of nonwoven fabric)

The biodegradable fiber obtained by the above method was carded with a carding machine at a speed of 80 to 150 m / min, a nonwoven web was produced, and passed between two hot rolls to prepare a calender bonded nonwoven fabric having a basis weight of 40 gsm. At this time, while the temperature of the hot roll to 90 ℃ to 130 ℃, the optimum temperature of the nonwoven fabric with the highest tensile strength was found to find the thermal fusion temperature (hereinafter referred to as the optimum hot roll temperature) to measure the physical properties.

Example 2

In the same manner as in Example 1, using a two-step equipment to produce a non-drawn yarn at a spinning speed of 1500m / min to proceed through the stretching to produce fibers and nonwoven fabrics.

Example 3

The same process as in Example 1, except that PLA resin (2002D) was mixed with the mica in the PBS resin and the inorganic nanoparticles, and the weight ratios of the PLA resin (2002D), PBS resin, and mica were 88% by weight, 7% by weight, and 5 It was melt mixed by weight.

Example 4

In the same manner as in Example 3, but the two-step equipment to produce a non-drawn yarn at a spinning speed of 1500m / min to proceed through the stretching to produce fibers and non-woven fabrics.

Example 5

The same process as in Example 1, except that PLA resin (2002D) is mixed with the mica in the PBS resin and the inorganic nanoparticles, and the weight ratio of the PLA resin (2002D), PBS resin, and mica is 55% by weight, 40% by weight and 5 It was melt mixed by weight.

Example 6

In the same manner as in Example 5, but the two-step equipment to produce a non-drawn yarn at a spinning speed of 1500m / min to proceed through the stretching to produce fibers and nonwoven fabrics.

Example 7

To carry out the same as in Example 2, using a PLA resin 4032D to prepare a fiber and a nonwoven fabric.

Example 8

To carry out the same as in Example 2, using a PLA resin 6201D to prepare a fiber and a nonwoven fabric.

Comparative Example 1

It carried out similarly to Example 2, but mixed and melted by mixing the weight ratio of PLA resin (2002D) and the white mica at 95% by weight and 5% by weight without mixing the PBS resin.

Comparative Example 2

The same procedure as in Example 2 was carried out, but the mixture was melted at 95% by weight and 5% by weight of the PLA resin and the white mica without mixing the PBS resin, PLA (4032D) was used.

Comparative Example 3

In the same manner as in Example 2, without mixing the PBS resin was mixed and melted in a weight ratio of 95% by weight and 5% by weight of PLA resin and white mica, PLA (6201D) was used as a PLA resin.

Comparative Example 4

The same process as in Example 2, except that PLA resin (2002D) was mixed with the mica in PBS resin and inorganic nanoparticles, and the weight ratio of PLA resin (2002D), PBS resin, and mica was 45% by weight, 50% by weight, and 5 It was melt mixed by weight.

Comparative Example 5

Performed in the same manner as in Comparative Example 4, but produced a non-stretched yarn at a spinning speed of 40m / min with a one-step equipment to produce a fiber and a non-woven fabric by proceeding through the stretching.

※ Analysis method

1. Melt Index (MI): According to ASTM D 1238

   Measured at 230 ° C, 2.16kg or 190 ° C, 2.16kg

2. PLA resin

PLA (2002D): Nature Works '2002D' Grade

PLA (4032D): Nature Works '4032D' Grade

PLA (6201D): Nature Works '6201D' Grade (most commonly used)

3. Radioactivity: Evaluated by measuring the number of fiber breaks and the number of spin drops generated immediately under the detention of 2,500 holes.

         However, trimming or dropping is less than once / hour: ◎

         Only 1 ~ 5 times / time for trimming or drop: ○

         However, more than 5 times / time of trimming or drop: △

         No radiation: ×

4. Fiber fineness measurement: Determination of fineness based on ASTM D1577

5. Fiber elongation measurement: measured based on ASTM D 3822

6. Non-woven carding property: When the fiber passes through the carding machine, curling, nep, flying, or web formation is bad between the card rolls.

7. Leveling agent: 1 (bad) ~ 5 (very good)

8. Nonwoven MD Strength: Measuring the strength of fabric machine direction based on ASTM D5034

9. Dyeing test: make an aqueous solution containing 0.6% by weight of Clariant's 'Foron Blue AS-3L', a disperse dye generally used for PET fibers, a certain amount of dispersant, glacial acetic acid, and sunlight enhancer, and bathe at 105 ℃ for 40 minutes. Dyeing progress. Check dyeability and fabric shrinkage.

10. The analysis of the prepared fiber is performed by chromatographic / mass spectrometry and the qualitative and quantitative analysis is performed by performing nuclear magnetic resonance spectroscopy (NMR) and infrared spectroscopy (FT-IR).

division Workability and Physical Properties of Fiber Nonwoven Workability and Properties
Dyeing test Radioactive Fineness (de) Strength (g / d) Shinto (%) Carding Leveling system Nonwoven MD Strength (kg / 5㎝) Example 1 ◎ 5.5 1.65 115 Good 5 3.93 Good Example 2 ◎ 5.0 2.85 75 Good 5 4.03 Good Example 3 ○ 5.2 1.52 98 Good 4 3.22 Good Example 4 ○ 4.9 2.58 85 Good 4 3.41 Good Example 5 ◎ 5.3 1.70 144 Good 4 4.12 Good Example 6 ◎ 5.2 2.91 94 Good 4 4.30 Good Example 7 ◎ 4.9 2.94 88 Good 4 4.08 Good Example 8 ◎ 5.0 3.07 90 Good 5 4.10 Good Comparative Example 1 × - - - - - - - Comparative Example 2 × - - - - - - - Comparative Example 3 ○ 5.0 2.44 34 Good 4 2.10 Fabric shrinkage and dyeing degradation Comparative Example 4 ○ 4.8 2.71 172 Bad 2 - - Comparative Example 5 ○ 4.9 1.52 77 Bad 2 - -

※ Test result

As a result of the test, the fiber and the nonwoven fabric produced in one embodiment of the present invention are characterized by excellent physical properties such as strength, excellent nonwoven fabric operability, and good dyeing and fabric shrinkage. However, as a result of looking at Comparative Example 1 and Comparative Example 2, the fiber prepared without PBS resin by mixing and melting the weight ratio of PLA resin (2002D and 4032D) and dolomite at 95% by weight and 5% by weight of the polymer discharged from the spinneret Due to crystallization and lack of elongation, fiber was difficult to cut and was not cut because it could not withstand tension.

Biodegradation Measurement

The biodegradability was measured as follows using the fiber and nonwoven fabric prepared according to one embodiment of the present invention (Example 1).

1. Experimental Standard: KS M 3100-1: 2003

2. Biodegradability Measurement Results

※ Biodegradability of test substance compared to standard substance

 45 days measurement: 62.1%

 -55 day measurement: 64.5%

If the biodegradation is continuously performed in relation to the biodegradability of the product during the disposal phase after use as an environmental standard (ECO), the biodegradation rate of the initial 45 days compared to the standard substance should be 60% or more. As a result of measurement, the fibers and nonwoven fabrics produced according to one embodiment of the present invention have biodegradability suitable for environmental standards.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

1 is a manufacturing process of the biodegradable fiber according to an embodiment of the present invention.

Claims (12)

In biodegradable fiber, Biodegradable fiber consisting of 50 to 92% by weight, 7 to 45% by weight and 1 to 5% by weight of polylactic acid (PLA) resin, PBS-based resin and inorganic. The method of claim 1, Biodegradable fiber, characterized in that the spinning temperature is made at 180 to 250 ℃. The method of claim 1, The polylactic acid (PLA) resin has a melt index of 10 to 50g / 10min, and a melting point measured by DSC is 145 to 230 ° C. The method of claim 1, The PBS-based resin is at least one selected from the group consisting of PBS (Polybutylene Succinate), PBSA (Polybutylene Succinate-co-adipate) or PBSF (Polybutylene succinate fumaric) or a mixture thereof. The method of claim 1, The inorganic material is biodegradable fiber, characterized in that at least one selected from the group containing mica, gold mica, barium sulfate, titanium dioxide, talc (Talc) and calcium carbonate (CaCO ₃ ). 6. The method according to any one of claims 1 to 5, Biodegradable fiber, characterized in that the MIt value of the mixture of the molten polylactic acid (PLA) resin, PBS resin and inorganic material 1 to 5. In the manufacturing method of the biodegradable fiber, Mixing and melting the polylactic acid (PLA) resin, the PBS resin, and the inorganic material at 50 to 92 wt%, 7 to 45 wt%, and 1 to 5 wt%, respectively, to form a mixture; Spinning the mixture at a temperature of 180 to 250 ° C. to produce undrawn yarn; Drawing the undrawn yarn at a draw ratio of 1.2 to 2.5; Crimping step for imparting crimp to the stretched stretched yarn; Attaching the spinning oil to the surface of the crimped stretched yarn after applying the crimp; And Method of producing a biodegradable fiber comprising the step of heat-setting the drawn yarn to which the spinning oil is attached, and then cut into fibers of a predetermined length. The method of claim 7, wherein The polylactic acid (PLA) resin is a melt index of 10 to 50g / 10min, the melting point measured by DSC is characterized in that the manufacturing method of biodegradable fiber, characterized in that. The method of claim 7, wherein The PBS resin is at least one selected from the group consisting of PBS (Polybutylene Succinate), PBSA (Polybutylene Succinate-co-adipate) or PBSF (Polybutylene succinate fumaric) or a mixture thereof. . The method of claim 7, wherein The inorganic material is a method for producing biodegradable fibers, characterized in that at least one selected from the group consisting of mica, gold mica, barium sulfate, titanium dioxide, talc (Talc) and calcium carbonate (CaCO ₃ ). The method of claim 7, wherein A method for producing biodegradable fibers in which hot air is dried with hot air temperature of 60 ° C. to 100 ° C. in direct or indirect contact with the fiber at the time of heat setting. A biodegradable nonwoven made from a biodegradable fiber according to any one of claims 1 to 5 and a fiber produced by the method according to any one of claims 7 to 11.

Images