KR102066118B1 - Method for manufacturing a fishing net using a biodegradable resin composition - Google Patents

Abstract

The present invention includes: a resin composition producing step of producing a resin composition which comprises aliphatic dicarboxylic acid and aliphatic glycol at a molar ratio of 1:1 by using adipic acid and succinic acid as aliphatic dicarboxylic acid and ethylene glycol and butanediol (1,4-butanediol) as aliphatic glycol as ingredients, wherein adipic acid is mixed at the ratio of 1 to 5 mol% with respect to 99 to 95 mol% of succinic acid in the aliphatic dicarboxylic acid and ethylene glycol is mixed at the ratio of 1 to 5 mol% with respect to 99 to 95 mol% of butanediol in the aliphatic glycol; a chip molding step of molding the resin composition passed through the producing step into chips by an extruder; a spinning step of introducing chips produced through the chip molding step into a spinning machine, and spinning the chips into mesh threads; and a knitting step of weaving a net by using the net threads obtained through the spinning step. Therefore, the present invention has effects of improving the amount of fishing, preventing the pollution of costal water by fishing nets abandoned in the sea, protecting marine ecosystems, and preventing ghost fishing to minimize damage by producing biodegradable fishing nets having the degree of flexibility raised up to the level of nylon nets.

Description

Process for manufacturing a fishing net using a biodegradable resin composition

The present invention relates to a method for manufacturing a fishing net, more specifically, a low-molecular substance is not only excellent in mechanical properties but also low in the concentration of carboxyl end groups excellent storage stability by using a biodegradable resin composition with small changes over time It is about a method.

In general, fishing nets are used to catch and capture fish, or in marine ranches to prevent their outflow and to distinguish their areas.

As a prior art, according to Patent Registration No. 10-1459009, 'Method of manufacturing a fishing net having an antifouling function and a fishing net manufactured by the method', the yarn for manufacturing the fishing net is a synthetic fiber yarn for manufacturing fishing nets made of synthetic fibers A metal yarn mixed fiber yarn composed of a metal yarn and a synthetic fiber yarn manufactured by combining 60 to 95 V / V% and an antifouling metal yarn 5 to 40 V / V% is prepared, and then the metal yarn Using a mixed fiber yarn to manufacture a fishing net having an antifouling function, the metal yarn mixed fiber yarn is a known synthetic fiber yarn for manufacturing fishing nets made of synthetic fibers, the metal yarn is copper, lead, zinc It is described that it is characterized in that the metal yarn made of one component selected from.

In addition, according to another prior art, Patent Publication No. 10-1749343, 'The method of manufacturing a durable fishing net', the fishing net is formed by twisting two or more yarns made of synthetic fibers through a twisting machine And, by inserting a plurality of the twisted yarns into a knitting machine to form a rope, and at the same time weaving the ropes to form a fishing net form, by twisting a plurality of yarns with each other through a twisting machine to make a twisted yarn In addition, it is possible to provide the convenience of storage and management of the yarn by greatly reducing the phenomenon that the finished yarn is uncomposed compared to the conventional yarn, and the fishing net of the yarn formed by twisting a plurality of yarns is caused by the twisted structure of the yarn. Significantly improved service life of fishing nets due to increased durability due to increased durability of the yarn and prevention of loosening of the yarn. It is described that there is an effect that can be made.

Since the conventional fishing net is installed on the seabed and then lifted up after a certain time, the fishing net is often lost due to the sea fishing being rough or the buoys are cut by other fishing boats operating while dragging the fishing gear. .

Accordingly, there is a problem that the conventional fishing net made of general resin as described above becomes a major cause of marine pollution by releasing environmental hormones and destroying marine ecosystems.

In addition, when the resin composition from which the fishing net is manufactured is made of a hardly decomposable vacation polymer synthetic resin or an organotin compound, there is a problem that it becomes a major cause of marine pollution that destroys the marine ecosystem by releasing environmental hormones.

Registered Patent Publication No. 10-1459009 Registered Patent Publication No. 10-1749343

The present invention has been made to solve this problem, it is excellent in weatherability and storage safety, by making it possible to manufacture a biodegradable fishing nets raised the level of flexibility to the level of nylon nets, not only to improve the catch, but also to the fishing nets discarded in the sea The present invention relates to a method for manufacturing a fishing net using a biodegradable resin composition which prevents pollution in coastal waters, protects marine ecosystems, and prevents ghost fishing to minimize damage.

The present invention is based on butanediol (1,4-butanediol) and ethylene glycol (ethylene glycol) and aliphatic dicarboxylic acid and succinic acid and adipic acid as aliphatic glycols, aliphatic dicarboxylic acid and aliphatic glycol It is composed of a molar ratio of 1: 1, the aliphatic dicarboxylic acid is mixed in a ratio of 1 to 5 mol% adipic acid with respect to 99m to 95 mol% succinic acid, the aliphatic glycol is ethylene to 99 to 95 mol% butanediol A resin composition manufacturing step in which a resin composition is prepared by mixing glycol in a ratio of 1 to 5 mol%, a chip forming step in which the resin composition passed through the manufacturing step is molded into chips by an extruder, and manufactured through the chip forming step. It is characterized in that it comprises a spinning step in which the chip is introduced into the spinning machine, spinning into the mesh thread, weaving a net using the mesh thread obtained through the spinning step.

In addition, succinic acid as aliphatic dicarboxylic acids, butanediol (1,4-butanediol) and ethylene glycol as aliphatic glycols are used as raw materials. Succinic acid and aliphatic glycol is composed of a molar ratio of 1: 1, the aliphatic glycol is a resin composition manufacturing step of producing a resin composition in which ethylene glycol is mixed in a ratio of 1 to 5 mol% with respect to 99 to 95 mol% butanediol, the preparation Chip forming step wherein the resin composition passed through the step is formed into a chip (chip) by the extruder, the chip produced through the chip forming step is introduced into the spinning machine, spinning step into the mesh thread, net yarn obtained through the spinning step It characterized in that it comprises a biasing step of weaving the net using.

The spinning step may include a chip melting step in which the chips dried in the chip forming step are melted, an extrusion step in which the melt melted in the chip melting step is extruded through a spinneret, and a filament extruded in the extrusion step is a cooling bath. Cooling step to pass through the cooling step, the filament passed through the cooling step is stretched by passing through the stretching roller, characterized in that it comprises a winding step of winding the filament passed through the stretching step in the bobbin.

In the drawing step, the filament cooled in the cooling step passes through the first drawing roller and passes through the wet bath, and the filament passed through the wet bath of the first drawing step is the second drawing roller. 4 through which the second drawing step passing through the first electric heater bath, the third drawing step passing through the second drawing step through the third drawing roller, the third drawing step passing through the second electric heater bath, and the fourth drawing roller relax. Characterized in that it comprises a secondary stretching step.

In addition, the resin composition has a number average molecular weight of 50,000 to 150,000, characterized in that the melt flow index is 1g / 10min ~ 6g / 10min at a load of 190 ° C 2160g.

In addition, the step of preparing the resin composition, (i) preparing a multifunctional compound represented by [Formula 1] by proceeding an esterification reaction of DL- malic acid and 1,4-cyclohexanedimethanol,

[Formula 1]

(Where x 3 is from 5 to 5)

(ii) reacting an aliphatic diol with an acid component comprising an aliphatic dicarboxylic acid in the presence of the multifunctional compound prepared in step (i) to prepare an oligomer that is an esterification and transesterification product, ( iii) preparing a resin composition by condensation-polymerizing the reaction product prepared in step (ii), (iv) adding the resin composition prepared in step (iii) to a twin screw extruder or kneader, and then using a chain extender. (C) solid-phase polymerization of the resin composition prepared in step (iv) at a temperature lower than the melting point, by introducing a chain extending reaction by adding one selected from an isocyanate compound or a carbodiimide compound. do.

Therefore, the present invention, by using PBEAS resin and PBES resin, it is possible to manufacture a biodegradable fishing net that raised the degree of flexibility to the nylon net level, thereby improving the catch, and also prevent the pollution of the coastal area by the fishing net abandoned in the sea It protects the marine ecosystem and prevents ghost fishing, thereby minimizing damage.

1 is a flow chart of a fishing net manufacturing method of the present invention.
2 is a flow chart of the spinning step of the fishing net manufacturing method of the present invention.
3 is a detailed flowchart of the stretching step of FIG.
Figure 4 is a schematic diagram of the spinning step of the fishing net manufacturing method of the present invention.

Hereinafter, with reference to the accompanying drawings will be described for the present invention.

1 is a flow chart of the fishing net manufacturing method of the present invention, Figure 2 is a flow chart of the spinning step of the fishing net manufacturing method of the present invention, Figure 3 is a detailed flowchart of the stretching step of Figure 2, Figure 4 is a spinning of the fishing net manufacturing method of the present invention Schematic diagram of the steps.

In the present invention, to produce a fishing net using PBEAS resin and PBES resin.

In more detail, the present invention is a resin composition manufacturing step (S100) in which the PBEAS resin or the PBES resin is manufactured, a chip molding step in which the resin composition completed through the manufacturing step is molded into chips by an extruder. (S200), the chip manufactured by the chip forming step is introduced into the spinning device, spinning step (S300) to be radiated into the mesh thread, net yarn weaving step using the net yarn obtained through the spinning step (S400) It relates to a method through which fishing nets are manufactured.

The PBEAS resin includes succinic acid and adipic acid as aliphatic dicarboxylic acids, butanediol (1,4-butanediol) and ethylene glycol as aliphatic glycols. ) As a raw material, and is a polymer obtained through an esterification reaction and a polycondensation reaction.

The PBEAS resin, aliphatic dicarboxylic acid and aliphatic glycol is composed of a molar ratio of 1: 1, the aliphatic dicarboxylic acid is mixed with adipic acid in the ratio of 1 to 5 mol% with respect to 99m to 95mol% succinic acid, The aliphatic glycol is mixed with ethylene glycol in a ratio of 1 to 5 mol% based on 99 to 95 mol% butanediol.

The PBES resin is based on succinic acid as aliphatic dicarboxylic acids, butanediol (1,4-butanediol) and ethylene glycol as aliphatic glycols. It is a polymer obtained through esterification reaction and polycondensation reaction.

The PBES resin is composed of an aliphatic dicarboxylic acid succinic acid and an aliphatic glycol in a molar ratio of 1: 1, and the aliphatic glycol is mixed in an amount of 1 to 5 mol% based on 99 to 95 mol% butanediol.

In more detail, the PBEAS resin and the PBES resin are aliphatic noses obtained through the sequential reaction of esterification and transesterification of aliphatic dicarboxylic acid and aliphatic diol, condensation polymerization, chain extension reaction, and solid state polymerization reaction. Reaction aid for improving the reaction rate and molecular weight of the polyfunctional compound represented by the following formula [1] which is a polyester, including the ring in the molecular structure in the esterification reaction and transesterification reaction and having different functional groups The number average molecular weights are 50,000-150,000, and the acid value shows 0.1 mgKOH / g-1.7 mgKOH / g by using.

[Formula 1]

(Where x 3 is from 5 to 5)

In addition, the multifunctional compound represented by [Formula 1] is obtained through esterification of DL-malic acid and 1,4-cyclohexanedimethanol under a nitrogen atmosphere.

The PBEAS resin and PBES resin, (i) preparing a multifunctional compound represented by [Formula 1] by performing an esterification reaction of DL- malic acid and 1,4-cyclohexanedimethanol,

(ii) reacting an acid component comprising an aliphatic dicarboxylic acid with an aliphatic diol in the presence of the multifunctional compound prepared in step (i) to prepare an oligomer that is an esterification and transesterification product,

(iii) condensation-polymerizing the reaction product prepared in step (ii) to prepare a resin composition,

(iv) adding the resin composition prepared in step (iii) to a twin screw extruder or kneader, and then adding a compound selected from an isocyanate compound or a carbodiimide compound as a chain extender to perform chain extension reaction;

(v) It is prepared by subjecting the resin composition prepared in step (iv) to a solid phase polymerization at a temperature lower than the melting point.

In more detail, (i) the esterification reaction of the 1: 1.2 molar ratio of DL-malic acid and 1,4-cyclohexanedimethanol at 210 ° C. for 120 minutes in the presence of a catalyst is represented by the above [Formula 1]. Preparing a multifunctional compound,

(ii) in the presence of the multifunctional compound prepared in step (i), aliphatic dicarboxylic acid and aliphatic diol 1: 1 were added to the reactor and reacted at 190 ° C to 210 ° C for esterification and transesterification products. Obtaining a phosphorus oligomer,

(iii) polycondensation reaction of the reaction product prepared in step (ii) for 90 minutes to 180 minutes under a vacuum degree of less than 2torr in the temperature range of 235 ℃ to 250 ℃, number average molecular weight 15,000 to 30,000 melt flow index 190 ℃, 2,160 preparing a resin composition of 30 g / 10 minutes to 60 g / 10 minutes under the measurement conditions of g,

(iv) the resin composition prepared in step (iii) is added to a twin screw extruder or a kneader, and then, 0.05 to 1 part by weight of a compound selected from an isocyanate compound or a carbodiimide compound is added as a chain extender to 100 to 180 ° C. Chain extension reaction in the range,

(v) The resin composition prepared in step (iv) is prepared through a solid phase polymerization at a temperature of 70 ° C. to 160 ° C. lower than the melting point.

At this time, the PBEAS resin, aliphatic dicarboxylic acid and aliphatic glycol is composed of a molar ratio of 1: 1, the aliphatic dicarboxylic acid is mixed in a ratio of 1 to 5 mol% adipic acid with respect to 99m to 95mol% succinic acid. In the aliphatic glycol, ethylene glycol is mixed at a ratio of 1 to 5 mol% based on 99 to 95 mol% butanediol.

In addition, the PBES resin, succinic acid and aliphatic glycol of aliphatic dicarboxylic acid is composed of a molar ratio of 1: 1, the aliphatic glycol is ethylene glycol is mixed in a ratio of 1 to 5 mol% to 99 to 95 mol% butanediol. .

And the physical properties of the resin that can be optimally applied in the present invention, the number average molecular weight is 50,000 ~ 150,000, it is difficult to secure the strength of the mesh made when the number average molecular weight is less than 50,000, when the resin exceeds 150,000 Due to the poor flow, the processing temperature is high, which may cause thermal decomposition and oxidation of the resin during processing, which may cause deterioration of physical properties.

In addition, the physical properties of the resin that can be optimally applied in the present invention, the melt flow index is in the range of 1g / 10min ~ 6g / 10min at a load of 190 degrees 2160g, when the melt flow index is less than 1g / 10min in processing Due to the poor flow of resin, the processing temperature is high, which can cause thermal decomposition and oxidation of the resin during processing, which can lead to physical property deterioration. Melt tension will fall and you will not be able to stretch it enough, and you will not be able to get a net with satisfactory properties.

On the other hand, the resin composition prepared by the above method is subjected to a chip forming step (S200) that is molded into a chip (chip).

The chip forming step (S200), by removing the moisture contained in the resin composition, so that the moisture content contained in the resin composition is less than a predetermined value, the tensile strength and physical properties required for the filament made of the resin composition To have.

 On the other hand, the chip manufactured through the chip forming step (S200) is introduced into the spinning device 300, and is subjected to the spinning step (S300) that is radiated into the mesh thread, the spinning step, the resin composition at a temperature above the melting point It melts and extrudes through a spinneret or a nozzle having a small diameter, and is cooled and solidified to obtain an elongated solid fiber (hereinafter referred to as 'filament').

The spinning step (S300), the chip melting step (S310), the chip is dried in the chip forming step (S200), the extrusion step in which the melt melted in the chip melting step is extruded through the spinneret 330 ( S320), a cooling step in which the filament extruded in the extrusion step is cooled by passing through the cooling tank 340 (S330), a stretching step (S340) is stretched by passing the cooling filament passes through the stretching roller (S340), the stretching step It includes a winding step (S350) is wound filament is wound on the bobbin 390.

Referring to Figure 4, in more detail, the spinning device 300 is coupled to the hopper 310, the chip is injected, the lower portion of the hopper, the cylinder for melting the chip transferred to the inside through the hopper 320, a spinneret 330 communicating with the cylinder to extrude the melt melted in the cylinder into a filament type, and a cooling tank 340 to cool the filament extruded through the spinneret; The feed roller for transferring the filament to the post-process, the first to fourth stretching rollers (350, 360, 370, 380) for stretching the filament and the first to fourth stretching rollers respectively installed to improve the physical properties of the stretched multifilament Drawing tank (wet tank, first electric heater tank, second electric heater tank).

Since the hopper 310 is installed in communication with the cylinder 320, the chip injected into the hopper is melted in the cylinder.

The cylinder 320 is provided with a heater for heating the inside of the cylinder to melt the chip, and the resin melted in the cylinder is extruded to the outside through the spinneret 330 by a piston installed inside the cylinder. .

In the present invention, as an embodiment, 40 nozzle holes are formed, and a spinneret having a diameter of 1.6 mm of the nozzle hole is used, and a plurality of nozzle holes are formed in the spinneret. It is extruded and wound up by a roller.

And the temperature of the cylinder 320, the temperature of the piston head, the temperature of the spinneret is different depending on the composition of the resin composition.

A cooling tank and a transfer roller are disposed below the spinneret 330 to cool the filament radiated from the spinneret.

The filament cooled in the cooling tank 340 is wound in the bobbin 390 through a multi-stage process by the stretching roller, the filament is stretched by the speed difference of the first to fourth stretching roller (350, 360, 370, 380) The tensile strength of the filament is determined by the stretching action.

In the drawing step (S340), the filament cooled in the cooling tank 340 passes through the first drawing roller 350 and passes through the wet tank 352 (S342), the first drawing step The filament passing through the wet tank 352 of the second pass through the first electric heater tank (362) passing through the second stretching roller 360 (S344), the filament passed through the second stretching step is the third The third stretching step (S346) passing through the second electric heater tank 372 through the stretching roller 370, the fourth stretching step in which the filament passed through the third stretching step is relaxed in the fourth stretching roller 380 ( S348).

Each stretching step includes a drawing tank such as a wet bath and an electric heater bath, in which the drawing bath may use a gas, a liquid, or a combination thereof.

In addition, in the present invention, the step of stretching by the stretching roller comprises four stages, the yarn strength is increased by increasing the thread little by little, the fourth stretching roller is reduced by the speed of rotation than the third stretching roller, It was designed to release (relax) the stress of the yarn.

In addition, the filament passed through the fourth drawing roller is wound around the bobbin.

Hereinafter, the conditions under which the PBEAS resin chip is emitted will be described.

When the PBEAS resin chip is extruded using the spinning device, the temperature inside the cylinder should be in the range of 198 to 223 ° C., the piston head to 223 ° C., and the spinneret to 220 ° C.

When the temperature inside the cylinder, the piston head temperature, and the spinneret temperature are lower than the respective reference values, the resin is not sufficiently melted in the equipment, so that single yarns occur easily when spinning the mesh thread and the resin is discharged from the spinneret. This is not made consistently causes a problem in that the diameter of the yarn is a deviation occurs, if the higher than the respective reference value is a problem that the gas is generated when the resin is extruded from the spinneret, the single yarn occurs or the physical properties are degraded by the thermal decomposition of the resin There is this.

In addition, the first to fourth stretching rollers have 10, 37, 75, 67 RPM, respectively, the temperature of the cooling tank is 5 ℃, the temperature of the wet tank is 68 ℃, the temperature of the first electric heater tank is 90 ℃, the second electric heater The bath temperature is configured to have a range of 72 ° C.

Hereinafter, a condition in which the PBES resin chip is radiated will be described.

When extruding the PBES resin chip using the spinning device, the temperature inside the cylinder should be in the range of 198 to 215 ° C, the piston head to 215 ° C and the spinneret to 213 ° C.

When the temperature inside the cylinder, the piston head temperature, and the spinneret temperature are lower than the respective reference values, the resin is not sufficiently melted in the equipment, so that single yarns occur easily when spinning the mesh thread and the resin is discharged from the spinneret. This is not made consistently causes a problem in that the diameter of the yarn is a deviation occurs, if the higher than the respective reference value is a problem that the gas is generated when the resin is extruded from the spinneret, the single yarn occurs or the physical properties are degraded by the thermal decomposition of the resin There is this.

In addition, the first to fourth stretching rollers have 10, 37, 75, 67 RPM, respectively, the temperature of the cooling tank is 5 ℃, the temperature of the wet tank is 68 ℃, the temperature of the first electric heater tank is 90 ℃, the second electric heater The bath temperature is configured to have a range of 72 ° C.

In the present invention, it is possible to impart the tensile strength required to the filament under such spinning conditions, and the filament (net thread) obtained through this spinning step has a mesh shape through a hatching step.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but it is only for the purpose of describing the present invention, and those skilled in the art to which the present invention pertains various modifications or equivalents from the detailed description of the invention. It will be appreciated that one embodiment is possible.

Therefore, the true scope of the present invention should be determined by the technical spirit of the claims.

S100: Resin composition manufacturing step S200: Chip forming step
S300: radiation step S400: bias step
S310: chip melting step S320: extrusion step
S330: Cooling step S340: Drawing step
S350: winding step
S342: 1st drawing step S344: 2nd drawing step
S346: 3rd drawing step S348: 4th drawing step
300: radiator 310: hopper
320: cylinder 330: radiation detention
340: cooling tank
350: first stretching roller 352: wet tank
360: 2nd extending roller 362: 1st electric heater tank
370: third stretching roller 372: second electric heater tank
380: fourth stretching roller 390: bobbin

Claims (6)

Butanediol (1,4-butanediol) as aliphatic glycols (ethylene glycol) and succinic acid and adipic acid as aliphatic dicarboxylic acid as raw materials,
Preparing a resin composition comprising an aliphatic dicarboxylic acid and an aliphatic glycol in a molar ratio of 1: 1 to prepare a resin composition;
A chip molding step in which the resin composition which has been subjected to the manufacturing step is molded into chips by an extruder;
A step of spinning the chip manufactured through the chip forming step into a spinning device and spinning into a mesh thread;
Including a net yarn weaving step using the net yarn obtained through the spinning step; including,
The resin composition manufacturing step,
(i) preparing a multifunctional compound represented by [Formula 1] by performing an esterification reaction between DL-malic acid and 1,4-cyclohexanedimethanol;
[Formula 1]

(Where x is 3 to 5)
(ii) in the presence of the polyfunctional compound prepared in step (i), with respect to aliphatic dicarboxylic acid mixed with adipic acid in a ratio of 1 to 5 mol% with respect to 99m to 95mol% of succinic acid, and for 99 to 95mol% butanediol. Preparing an oligomer which is an esterification reaction and a transesterification product by reacting aliphatic glycol mixed with ethylene glycol in a ratio of 1 to 5 mol%;
(iii) condensation-polymerizing the reaction product prepared in step (ii) to prepare a resin composition;
(iv) adding the resin composition prepared in step (iii) to a twin screw extruder or kneader, and then adding a compound selected from an isocyanate compound or a carbodiimide compound as a chain extender to perform chain extension reaction;
(v) solid-phase polymerization of the resin composition prepared in step (iv) at a temperature lower than the melting point;
The spinning step,
A chip melting step of melting the dried chips in the chip forming step;
An extrusion step of extruding the melt melted in the chip melting step through a spinneret;
A cooling step in which the filament extruded in the extrusion step is cooled by passing through a cooling tank;
A drawing step in which the filament having undergone the cooling step is drawn by passing through a drawing roller;
Includes; winding the filament is passed through the stretching step wound on the bobbin,
In the extrusion step, the chip is pushed forward by the piston head installed in the cylinder inside the cylinder at a temperature of 198 ~ 223 ℃, the extrusion through the spinneret, the piston head is 223 ℃, the spinneret is Fishing net manufacturing method using a biodegradable resin composition, characterized in that 220 ℃.
Succinic acid as aliphatic dicarboxylic acids, butanediol (1,4-butanediol) and ethylene glycol (ethylene glycol) as aliphatic glycols,
Succinic acid, which is an aliphatic dicarboxylic acid, and an aliphatic glycol in a molar ratio of 1: 1 to prepare a resin composition;
A chip molding step in which the resin composition which has been subjected to the manufacturing step is molded into chips by an extruder;
A spinning step of inserting a chip manufactured through the chip forming step into a spinning machine and spinning into a mesh thread;
Including including; net yarn weaving step using the net yarn obtained through the spinning step; including,
The resin composition manufacturing step,
(i) preparing a multifunctional compound represented by [Formula 1] by performing an esterification reaction between DL-malic acid and 1,4-cyclohexanedimethanol;
[Formula 1]

(Where x is 3 to 5)
(ii) in the presence of the polyfunctional compound prepared in step (i), by reacting aliphatic glycol mixed with ethylene glycol in an amount of 1 to 5 mol% based on 99 to 95 mol% of succinic acid, which is the aliphatic dicarboxylic acid, and butanediol; Preparing an oligomer that is an esterification and transesterification product;
(iii) condensation-polymerizing the reaction product prepared in step (ii) to prepare a resin composition;
(iv) adding the resin composition prepared in step (iii) to a twin screw extruder or kneader, and then adding a compound selected from an isocyanate compound or a carbodiimide compound as a chain extender to perform chain extension reaction;
(v) solid-phase polymerization of the resin composition prepared in step (iv) at a temperature lower than the melting point;
The spinning step,
A chip melting step of melting the dried chips in the chip forming step;
An extrusion step of extruding the melt melted in the chip melting step through a spinneret;
A cooling step in which the filament extruded in the extrusion step is cooled by passing through a cooling tank;
A drawing step in which the filament having undergone the cooling step is drawn by passing through a drawing roller;
Includes; winding the filament is passed through the stretching step wound on the bobbin,
In the extruding step, the chip is pushed forward by the piston head installed in the cylinder in the cylinder at a temperature of 198 ~ 215 ℃, the extrusion through the spinneret, the piston head is 215 ℃, the spinneret is Fishing net manufacturing method using a biodegradable resin composition, characterized in that the 213 ℃.
delete The method according to any one of claims 1 to 2,
The stretching step,
A first stretching step in which the filament cooled in the cooling step passes through a first drawing roller and passes through a wet bath;
A second stretching step in which the filament passing through the wet bath of the first drawing step passes the first electric heater tank via the second drawing roller;
A third drawing step in which the filament having undergone the second drawing step passes through a second electric heater tank via a third drawing roller;
A fourth drawing step of relaxing in the fourth drawing roller; Fishing net manufacturing method using a biodegradable resin composition comprising a.
The method according to any one of claims 1 to 2,
The resin composition has a number average molecular weight of 50,000 to 150,000, the melt flow index of the fishing net using a biodegradable resin composition, characterized in that 1g / 10min ~ 6g / 10min at a load of 2160g 190 ℃.
delete

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