KR102257140B1 - Biodegradable resin composition, molded article comprising the same, and method for manufacturing the molded article - Google Patents

Abstract

The present invention relates to a biodegradable resin composition, a molded article including the same, and a method for manufacturing the molded article. The biodegradable resin composition includes: polylactide (PLA); polyhydroxyalkanoate (PHA); polybutylene succinate (PBS); polybutylene adipate-co-terephthalate (PBAT); inorganic fillers containing both of montmorillonite and wollastonite; and additives. The biodegradable resin composition, with respect to 100 parts by weight of the biodegradable resin composition, may comprise: 5-10 parts by weight of the PHA; 5-10 parts by weight of the PBS; 5-15 parts by weight of the montmorillonite; and 10-15 parts by weight of the wollastonite.

Description

Biodegradable resin composition, molded article comprising the same, and method for manufacturing the molded article {Biodegradable resin composition, molded article comprising the same, and method for manufacturing the molded article}

The present invention relates to biodegradable resin technology, and more particularly, to a biodegradable resin composition, a molded article including the same, and a method of manufacturing the molded article.

In general, synthetic plastics are indispensable for modern life due to their excellent properties, low price, and light characteristics, and are used for various purposes all over the world. The synthetic plastic is a major raw material for disposable products that are discarded after one to several times of use due to such advantages such as physical properties, convenience, product productivity, and price. However, synthetic plastics have a problem in that they are not easily decomposed as their merits and demerits, and this raises the problem of environmental pollution.

Accordingly, efforts are being made to reduce the use of disposable products or recycle used disposable plastics. Along with these efforts, new attempts are underway on biodegradable resins that can be degraded in nature. In particular, in the case of polylactic acid (PLA), its use is expanding to areas where general plastics such as food packaging materials and containers, and electronic product cases have been used.

However, despite the advantage that such biodegradable resin is a material that is naturally degraded by microorganisms in the soil, it has a disadvantage in that mechanical properties such as dimensional stability, tensile strength, and hardness are low. Since the mechanical properties are low, when the biodegradable resin is manufactured as a thin film product, the problem of being easily damaged is serious. In order to reinforce such physical properties, efforts have been made to add other general resins or inorganic fillers to the biodegradable resin, but as a result, there is a problem that environmental problems cannot be solved.

In addition, since the conventional biodegradable resin has poor heat resistance, there is a problem that the biodegradable resin cannot be utilized in a heating container or the like. For example, when the external temperature rises above 60°C, the shape of the molded product may be deformed or decomposed by itself in an environment of high temperature and high humidity.

One problem to be solved by the present invention is a biodegradable resin composition having improved physical properties and heat resistance and environmentally friendly properties that are harmless even when contacting a living body or food in order to solve the above-described conventional problems, a molded article including the same, and the production of the molded article Is to provide a way.

In order to achieve the above-described technical problem of the present invention, the biodegradable resin composition of the present invention is polylactide (hereinafter, abbreviated as'PLA'); Polyhydroxyl alkanoate (hereinafter abbreviated as'PHA'); Polybutylene succinate (hereinafter abbreviated as'PBS'); Polybutylene adipate terephthalate (polybutylene adipate- co- terephthalate, hereinafter abbreviated as'PBAT'); Inorganic filler containing at least one of montmorillonite and wollastonite; And additives.

The PLA may be a resin obtained by mixing poly-L-lactide (PLLA) and poly-D-lactide (PDLA).

The additive may include at least one of a crosslinking agent and a compatibilizer.

Based on 100 parts by weight of the biodegradable resin composition, the PLA is 33 parts by weight or more and 72 parts by weight or less, the PHA is 5 parts by weight or more and 10 parts by weight or less, the PBS is 5 parts by weight or more and 10 parts by weight or less, the PBAT is 5 parts by weight or more and 10 parts by weight or less, the inorganic filler may be 5 parts by weight or more and 30 parts by weight or less, and the additive may be 3 parts by weight or more and 7 parts by weight or less.

The inorganic filler may be 5 parts by weight or more and 10 parts by weight or less of montmorillonite and 5 parts by weight or more and 10 parts by weight or less of wollastonite.

The additive may include 2 parts by weight or more and 4 parts by weight or less of a crosslinking agent and 1 part by weight or more and 3 parts by weight or less of a compatibilizer.

In order to achieve the above-described technical problem of the present invention, a molded article comprising the biodegradable resin composition of the present invention is PLA; PHA; PBS; PBAT; Inorganic filler containing at least one of montmorillonite and wollastonite; And a biodegradable resin composition containing an additive.

The density of the molded article may be 1.20 g/cm ³ or more and 1.50 g/cm ³ or less.

The melt index (190°C, 2.16kg) of the molded article may be 5 g/10min or more and 8 g/10min or less.

The melting point of the molded article may be greater than or equal to 160°C and less than or equal to 175°C.

The heat-resistant temperature of the molded article may be 110°C or more and 120°C or less.

The moisture content of the molded article may be 200 ppm or less.

In order to achieve the above-described technical problem of the present invention, the manufacturing method for manufacturing the molded article of the present invention is PLA; PHA; PBS; PBAT; Inorganic filler containing at least one of montmorillonite and wollastonite; And preparing a raw material comprising a biodegradable resin composition containing an additive; Mixing the raw materials of the biodegradable resin composition; Melt-extruding the mixture in which the raw materials are mixed; And cooling the extruded molded article. Includes.

The step of mixing the raw materials may be mixing particles having a solid state.

After the melt-extrusion step, it may proceed to a step of cooling without a separate drying step.

The step of cooling the molded article may be performed by an air cooling system.

It may further include the step of packaging after the step of cooling the molded article.

According to an embodiment of the present invention, a biodegradable resin composition based on polylactide, an eco-friendly plastic raw material, is provided to provide an eco-friendly material that is harmless even when it comes into contact with a living body or food, and a molded article made of the material. can do.

In addition, according to an embodiment of the present invention, by adding an inorganic filler to an eco-friendly plastic material, it is possible to provide a material exhibiting excellent mechanical properties such as heat resistance and strength as well as eco-friendly properties, and a molded article made of the material.

In addition, according to an embodiment of the present invention, when manufacturing a biodegradable resin composition into a molded article, a molded article containing a biodegradable resin composition capable of saving energy and time and increasing production efficiency by omitting a separate drying process A manufacturing method can be provided.

1 is a graph showing the mechanical strength of a molded article according to an embodiment and a comparative example of the present invention.
2 is a graph showing the heat resistance of a molded article according to an embodiment and a comparative example of the present invention.
3 is a flow chart for a method of manufacturing a molded article according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the examples. Rather, these embodiments are provided to make the present disclosure more faithful and complete, and to fully convey the spirit of the present invention to those skilled in the art.

Also, as used herein, the term “and/or” includes any and all combinations of one or more of the corresponding listed items.

The terms used in this specification are used to describe specific embodiments, and are not intended to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly indicates another case. Also, as used herein, “comprise” and/or “comprising” specify the presence of the mentioned shapes, numbers, steps, actions, members, elements and/or groups thereof. And does not exclude the presence or addition of one or more other shapes, numbers, actions, members, elements and/or groups.

In addition, the term "parts by weight" as used herein is a unit representing the content of the resin composition, and represents the weight of each component contained based on 100 parts by weight of the resin.

In addition, in the present specification, since polylactide (PLA) is a synthetic resin having a content of lactic acid of 50% or more in the basic polymer, polylactide includes polylactic acid or polylactic acid. Used in meaning.

The present invention will be described in more detail as follows.

The biodegradable resin composition of the present invention is polylactide (hereinafter, abbreviated as'PLA'); Polyhydroxyl alkanoate (hereinafter, abbreviated as'PHA'); Polybutylene succinate (hereinafter abbreviated as'PBS'); Polybutylene adipate terephthalate (polybutylene adipate- co- terephthalate, hereinafter abbreviated as'PBAT'); Inorganic filler containing at least one of montmorillonite and wollastonite; And additives.

The PLA may be a resin including poly-L-lactide (PLLA) and poly-D-lactide (PDLA). The PLA may be obtained by ring-opening condensation reaction of lactic acid obtained by lactic acid fermentation of starch, and in this case, the ratio in which the PLLA and the PDLA are mixed may be a non-limiting example. For example, it is preferable that the PDLA is contained in a range of 1 to 7 weight based on 100 weight of the PLA, more preferably, the PDLA is contained in less than 5 weight based on 100 weight of the PLA. Do. If the weight of the PDLA is contained in less than 1 weight based on the total weight of the PLA, there is a concern that heat resistance may not be sufficient, and if it exceeds 7 weight, the melting point of the PLA increases, thereby reducing the ease of processing of the resin.

On the other hand, as another method of forming the PLA, in addition to the method of fermenting the starch with lactic acid, a method of forming a PLA stereo complex is also possible. In this regard, each of the PLLA and the PDLA is dissolved in a solvent, and a sufficient time is secured to completely dissolve the PLLA and the PDLA in a solvent, and then the PLLA and PDLA are mixed and blended in accordance with a preset mixing ratio. The mixing ratio is a non-limiting example, and PLLA and PDLA may be mixed in the same amount of 1:1, and the present invention is not limited thereto, and the mixing ratio is 2:1 or 1: It can be diversified into two. The PLLA and PDLA of the obtained mixed solution are precipitated and separated from the solution, and then the separated component is dried in an oven to form PLA having a composite structure. However, the method of mixing the PLLA and the PDLA is not limited thereto, and a person skilled in the art can secure a polylactide having a composite structure by using a method such as melt crystallization or solution casting according to experimental conditions or process conditions. Of course.

The PLA is preferably 33 parts by weight or more and 72 parts by weight or less based on 100 parts by weight of the biodegradable resin composition. When the PLA is less than 33 parts by weight, it is difficult to derive heat resistance properties, etc. in a heating container, and when it exceeds 72 parts by weight, the processability of the biodegradable resin may be deteriorated.

PHA may be included in an amount of 5 parts by weight or more and 10 parts by weight or less based on 100 parts by weight of the biodegradable resin composition. The PHA is not particularly limited and includes both homopolymers and copolymers. Since the PHA serves as a modifier, it is a composition contained in order to improve the performance of the biodegradable resin composition, for example, strength or abrasion resistance. When the PHA is less than 5 parts by weight, it is difficult to sufficiently secure the mechanical performance required for the biodegradable resin, and when the PHA is more than 10 parts by weight, the processability of the biodegradable resin may be deteriorated.

PBS may be included in an amount of 5 parts by weight or more and 10 parts by weight or less based on 100 parts by weight of the biodegradable resin composition. The PBS is a condensation polymerization aliphatic polyester and is a heat-resistant polymer having a relatively higher melting point than other polyesters. When the PBS is less than 5 parts by weight, the heat resistance or strength properties of the biodegradable resin may be deteriorated, and when the amount is more than 10 parts by weight, flexibility may be lowered and processability may be lowered.

PBAT may be included in an amount of 5 parts by weight or more and 10 parts by weight or less based on 100 parts by weight of the biodegradable resin composition. The PBAT has a low structural strength compared to the PBS, but has excellent flexibility, there is a limit to securing sufficient processability of the resin when the PBAT is less than 5 parts by weight, and sufficient heat resistance of the resin when it exceeds 10 parts by weight. There may be limitations to securing.

In addition, in the present invention, an inorganic filler including at least one of montmorillonite and wollastonite may be included in an amount of 5 parts by weight or more and 30 parts by weight or less. It is preferable in the mixing of the resin composition that the montmorillonite and wollastonite are nano-sized inorganic particles. The montmorillonite is a component that improves properties such as strengthening mechanical properties, increasing heat resistance, and increasing gas barrier properties, and may be included in an amount of 5 parts by weight or more and 30 parts by weight or less, and preferably 5 parts by weight or more and 15 parts by weight or less. Can be included. When the amount of montmorillonite is less than 5 parts by weight, there is a limit to improving the above-described mechanical properties, and when it exceeds 30 parts by weight, the melt viscosity may increase and processing may be difficult.

In addition, the wollastonite is represented by the _{formula CaSiO 3 , and usually contains about 50% by weight of SiO 2} , about 47% by weight of CaO, and other Fe ₂ O ₃ , Al ₂ O ₃ , and the like. The wollastonite is generally in the form of a white needle-like powder obtained by grinding and classifying a gemstone. The wollastonite may be included in an amount of 5 parts by weight or more and 30 parts by weight or less based on 100 parts by weight, and preferably 5 parts by weight or more and 30 parts by weight or less. If the amount of wollastonite is less than 5 parts by weight, it is difficult to improve the mechanical properties and heat resistance of the molded article molded from the biodegradable resin composition, and if it exceeds 30 parts by weight, it may be difficult to process the molded article.

In addition to containing at least one of the montmorillonite and the wollastonite, the inorganic filler may further include aluminum hydroxide, lime carbonate, lime silicate, silica, etc., but this may be appropriately selected according to the manufacturing environment of a person skilled in the art. Preferably, the montmorillonite and the wollastonite are simultaneously included, and in some cases, other inorganic fillers other than the montmorillonite and wollastonite are not included. As such, it is possible to secure a biodegradable resin composition exhibiting excellent environmental characteristics and excellent heat resistance at the same time only with montmorillonite and wollastonite.

In addition, the biodegradable resin composition includes an additive, and it is preferable to include a crosslinking agent and a compatibilizer as the additive. Optionally, the additive may further include fumed silica. The crosslinking agent is added to improve heat resistance and mechanical strength of the biodegradable resin composition and to improve hydrolysis resistance. The kind of the crosslinking agent is such that it can be appropriately selected by a person skilled in the art, and for example, t-butylperoxyisopropylcarbonate or the like can be used as a methacrylate-based monomer or a peroxide-based crosslinking agent.

The crosslinking agent is preferably contained in an amount of 2 parts by weight or more and 4 parts by weight or less based on 100 parts by weight of the biodegradable resin composition. If the crosslinking agent is less than 2 parts by weight, the effect of adding the crosslinking agent may be insufficient, and if the crosslinking agent is more than 4 parts by weight, there is a concern that product defects may occur due to a reaction between the crosslinking agents.

In addition, the compatibilizer is preferably contained in an amount of 1 part by weight or more and 3 parts by weight or less based on 100 parts by weight of the biodegradable resin composition. The compatibilizer is a material for causing strong interfacial adhesion by assisting miscibility or compatibility while being present at the interface between constituents.Polyethylene glycol (PEG), maleic anhydrate, and glycidil maleic anhydrade (GAM) can be applied. However, it is not limited thereto. If the amount of the compatibilizer is less than 1 part by weight, the effect of improving compatibility between raw materials may be insufficient, and if it is more than 3 parts by weight, it is not preferable because it may have side effects such as stickiness or stickiness in the molded article.

Hereinafter, the present invention will be described in more detail by the following examples and comparative examples. However, the present embodiment is merely illustratively described to aid understanding, and is not intended to limit the present invention.

Example 1

The biodegradable resin composition according to Example 1 is based on 100 parts by weight of PLA 55 parts by weight, PBS 5 parts by weight, PBS 10 parts by weight, PBAT 5 parts by weight, montmorillonite (using Cloistite 20A of Southern Clay) 5 parts by weight, Wallasto Knight (using Kotsu's XA-600) 15 parts by weight, crosslinking agent (3-metacryloxypropyl-triethoxysilane, manufacturer: Shin Yetsu, product name: KBM5103) 3 parts by weight and compatibilizer (maleic anhydride, using Yongsan Chemical Co., Ltd.) 2 parts by weight I did. Here, the PLA is a stereocomplex in which PLLA and PDLA are melt-mixed at a weight ratio of 1:1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D) and heat resistance evaluation, and the results are shown in Table 2 below.

Example 2

The biodegradable resin composition according to Example 2 is based on 100 parts by weight: PLA 55 parts by weight, PHA 10 parts by weight, PBS 5 parts by weight, PBAT 5 parts by weight, montmorillonite (Cloistite 20A) 10 parts by weight, wollastonite 10 parts by weight , 3 parts by weight of a crosslinking agent and 2 parts by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D) and heat resistance evaluation, and the results are shown in Table 2 below.

Example 3

The biodegradable resin composition according to Example 3 is based on 100 parts by weight: PLA 55 parts by weight, PHA 10 parts by weight, PBS 5 parts by weight, PBAT 5 parts by weight, montmorillonite (Cloistite 20A) 5 parts by weight, wollastonite 15 parts by weight , 2 parts by weight of a crosslinking agent and 3 parts by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Example 4

The biodegradable resin composition according to Example 4 is based on 100 parts by weight: PLA 55 parts by weight, PHA 10 parts by weight, PBS 5 parts by weight, PBAT 5 parts by weight, montmorillonite (Cloistite 20A) 10 parts by weight, wollastonite 10 parts by weight , 3 parts by weight of a crosslinking agent and 2 parts by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Example 5

The biodegradable resin composition according to Example 5 is based on 100 parts by weight: PLA 55 parts by weight, PHA 8 parts by weight, PBS 7 parts by weight, PBAT 7 parts by weight, montmorillonite (Cloistite 20A) 8 parts by weight, wollastonite 10 parts by weight , 4 parts by weight of a crosslinking agent and 1 part by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Comparative Example 1

The biodegradable resin composition according to Comparative Example 1 was melt-extruded using only PLA composed of a mixture of PLLA and PDLA as 100 parts by weight of the composition based on 100 parts by weight. The resulting extrudate was molded into 3.2 mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Comparative Example 2

The biodegradable resin composition according to Comparative Example 2 is based on 100 parts by weight: PLA 80 parts by weight, PHA 0 parts by weight, PBS 5 parts by weight, PBAT 5 parts by weight, montmorillonite (Cloistite 20A) 5 parts by weight, wollastonite 5 parts by weight , 0 parts by weight of a crosslinking agent and 0 parts by weight of a compatibilizer were mixed. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Comparative Example 3

The biodegradable resin composition according to Comparative Example 3 is 70 parts by weight of PLA, 5 parts by weight of PHA, 5 parts by weight of PBS, 5 parts by weight of PBAT, 5 parts by weight of montmorillonite (Cloistite 20A), 5 parts by weight of wollastonite, based on 100 parts by weight. , 4 parts by weight of a crosslinking agent and 1 part by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Comparative Example 4

The biodegradable resin composition according to Comparative Example 4 is based on 100 parts by weight of PLA 60 parts by weight, PHA 5 parts by weight, PBS 5 parts by weight, PBAT 10 parts by weight, montmorillonite (Cloistite 20A) 10 parts by weight, wollastonite 7 parts by weight , 2 parts by weight of a crosslinking agent and 1 part by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Comparative Example 5

The biodegradable resin composition according to Comparative Example 5 is 50 parts by weight of PLA, 5 parts by weight of PHA, 10 parts by weight of PBS, 10 parts by weight of PBAT, 15 parts by weight of montmorillonite (Cloistite 20A), 5 parts by weight of wollastonite based on 100 parts by weight. , 2 parts by weight of a crosslinking agent and 3 parts by weight of a compatibilizer were mixed, and the crosslinking agent and the compatibilizer were the same type as in Example 1. The extrudate obtained by melt extrusion of the mixed raw materials was molded into 3.2mm bars at 23°C. Thereafter, the bar was subjected to an Izod impact test (ASTM D256D), and the results are shown in Table 2 below.

Prior to describing Table 2 showing the results for Examples 1 to 5 and Comparative Examples 1 to 5, Table 1 below shows each composition component and composition ratio in the biodegradable resin composition constituting the Examples and Comparative Examples. Represents.

PLA PHA PBS PBAT Montmorillonite Wollastonite Crosslinking agent Compatibilizer Example 1 55 5 10 5 5 15 3 2 Example 2 55 10 5 5 10 10 3 2 Example 3 55 10 5 5 5 15 2 3 Example 4 55 10 5 5 10 10 3 2 Example 5 55 8 7 7 8 10 4 One Comparative Example 1 100 0 0 0 0 0 0 0 Comparative Example 2 80 0 5 5 5 5 0 0 Comparative Example 3 70 5 5 5 5 5 4 One Comparative Example 4 60 5 5 10 10 7 2 One Comparative Example 5 50 5 10 10 15 5 2 3

Each composition included in the biodegradable resin composition is expressed in parts by weight.

Example One 2 3 4 5 Impact strength (J/m) 289 356 342 295 306 Heat resistance evaluation (sec) 353 536 489 512 397 Comparative example One 2 3 4 5 Impact strength (J/m) 89 121 194 225 275 Heat resistance evaluation (sec) 15 38 121 215 265

The impact strength shown in Table 2 was obtained by melt-kneading the biodegradable resin composition with a single screw extruder (L/D: 40, 35 mm in diameter) under conditions of 170 to 190° C. and extruding it into a sheet having a thickness of 1 mm. This is an evaluation in which an Izod impact test (ASTM D256D) was conducted on the bar after it was molded into a bar shape having a length of mm.

In the heat resistance evaluation shown in Table 2 above, a sheet was manufactured in the same manner as that prepared to evaluate the impact strength, and the sheet was molded into a container capable of holding food using a vacuum molding machine, and then water was added to the molded container. It is a measure of the time until the container is deformed by heating it in a microwave oven.

As can be seen from Table 2 and FIG. 1, it can be seen that the pellets obtained from the biodegradable resin compositions of Examples 1 to 5 have relatively excellent impact strength compared to the pellets obtained from the biodegradable resin compositions of Comparative Examples 1 to 5 have. Specifically, in the case of Comparative Examples 1 to 5, it is confirmed that there is a limit to increasing the impact strength to a level of 300 J/m.

Similarly, as can be seen in Table 2 and Figure 2, the containers obtained from the biodegradable resin compositions of Examples 1 to 5 have excellent heat resistance compared to the containers obtained from the biodegradable resin compositions of Comparative Examples 1 to 5, and the degree of heat resistance It has suitable properties for heating or use as a container/packaging material in a bath. For example, in the case of Comparative Example 5, even though it was determined that heat resistance was excellent among the comparative examples, it was confirmed that sufficient heat resistance as a heating container could not be secured because it had heat resistance of 300 seconds (5 minutes) or less.

As described above, the pellet obtained from the biodegradable resin composition according to an embodiment of the present invention improves heat resistance and mechanical strength at the same time, and thus can be suitably used as a heating container under heating/bathing conditions.

Hereinafter, a molded article including a biodegradable resin composition according to another embodiment of the present invention will be described. The method of manufacturing the molded article can be applied without limitation, as long as the biodegradable resin composition of the present invention can be molded to have a certain shape, and of course, a person skilled in the art can appropriately select it in consideration of the shape of the final molded article. to be. For example, sheet molding, vacuum molding, pressure vacuum, film molding, injection molding, and the like can be applied, and as a result, the molded product is a sheet that can be applied to a packaging material/packaging container, a film, a strand melt-extruded from an extruder. ), food packaging material/packaging container, food container for microwave heating, industrial packaging material, etc., but is not limited thereto.

The molded article including the biodegradable resin composition according to an exemplary embodiment of the present invention may include all various types of processed articles obtained by applying the biodegradable resin composition according to an exemplary embodiment of the present invention. As a specific and non-limiting example, the molded article of the present invention may be a barrier film or a tray-shaped container to which a roll-to-roll process is applied. When the molded product is a barrier film, as a non-limiting example, a film can be produced using a blown film extruder, and in the case of a tray-shaped container, a sheet is first produced with a sheet extruder and then a vacuum forming machine is used as a non-limiting example. You can make a tray.

A molded article comprising the biodegradable resin composition according to an embodiment of the present invention may have a density of 1.20 g/cm ³ or more and 1.50 g/cm ³ or less, and a melt index (190° C., 2.16 kg) of 5 g/10min or more 8 It may be g/10min or less, the melting point may be 160° C. or more and 175° C. or less, the heat resistance temperature may be 110° C. or more and 120° C. or less, and the moisture content may be 200 ppm or less. Due to the characteristic values of the molded article, the molded article including the biodegradable resin composition of the present invention is an eco-friendly material and is suitable for use in products related to a heating/bathing container that requires heat resistance.

Next, as another embodiment of the present invention, a method of manufacturing a molded article including a biodegradable resin composition will be described. For reference, the molded article including the biodegradable resin composition of the present invention described above may not be manufactured only by the manufacturing method described below, and the manufacturing method described below as an example by a person skilled in the art in consideration of manufacturing conditions or equipment conditions. Of course, it is possible to use a different manufacturing method than that, and of course, the following manufacturing method can be appropriately designed and used.

Referring to Figure 3, the manufacturing method for manufacturing a molded article containing the biodegradable resin composition is a biodegradable resin composition raw material preparation step (S10), the raw material mixing step (S20), melt extrusion step (S30), It includes a cooling step (S40), and a pellet forming step (S50).

Raw material preparation step (S10)

First, the raw material of the biodegradable resin composition is polylactide (hereinafter, abbreviated as'PLA'); Polyhydroxyl alkanoate (hereinafter abbreviated as'PHA'); Polybutylene succinate (hereinafter abbreviated as'PBS'); Polybutylene adipate terephthalate (polybutylene adipate- co- terephthalate, hereinafter abbreviated as'PBAT'); Inorganic filler containing at least one of montmorillonite and wollastonite; And additives.

More specifically, based on 100 parts by weight of the biodegradable resin composition, the PLA is 33 parts by weight or more and 72 parts by weight or less, the PHA is 5 parts by weight or more and 10 parts by weight or less, and the PBS is 5 parts by weight or more and 10 parts by weight or less. , The PBAT is 5 parts by weight or more and 10 parts by weight or less, the inorganic filler is montmorillonite 5 parts by weight or more and 15 parts by weight or less, wollastonite 5 parts by weight or more and 15 parts by weight or less, the additive is a plasticizer and a compatibilizer rule of 2 parts by weight, respectively. It may contain more than 4 parts by weight or less, and 1 part by weight or more and 3 parts by weight or less.

In this case, each of the raw materials is preferably prepared in a solid powder state having a predetermined size for convenience of mixing.

Raw material mixing step (S20)

Next, after the raw materials are prepared, the raw materials in a solid powder state are mixed. The equipment used for mixing may be a double blade ribbon mixer, but equipment capable of uniformly mixing the raw materials is sufficient.

Melt extrusion step (S30)

Thereafter, the mixture is melt-extruded using an extruder equipped with a raw material supply device. The selection of the extruder may be appropriately selected according to the user's purpose among known extruders, and as an example, a strand may be formed by melt extrusion using a twin extruder. Since the process of forming strands by melt extrusion of the mixture is a known technique, detailed descriptions thereof are omitted, and a person skilled in the art may form strands using appropriate equipment according to circumstances. Here, the strand is only an example of a molded article having a fixed shape, and the shape of the strand may be designed and changed by a person skilled in the art, and may be various shapes such as a sheet, a film, and a round bar. For example, in order to manufacture a sheet or film containing a biodegradable resin composition, the mixed raw material may be melt-extruded through a T-die extruder for sheet manufacturing and processed into a sheet shape. In addition, after processing into a sheet shape, the sheet may be processed to a thickness desired by the user by a three-axis roll rolling method to obtain a film shape.

Cooling step (S40)

Next, the molded article obtained in the melt extrusion step is cooled. Natural cooling may be performed for cooling, but it is preferable to apply an air cooling system capable of inducing evaporation of moisture as well as cooling. In the case of cooling a molded product using an air cooling system, a separate drying step can be omitted by controlling the temperature and humidity together, thereby saving energy and processing time. It may further include the step of pelletizing the molded article to an appropriate size after the cooling step (S40).

Pellet formation step (S50)

Thereafter, the cooled molded article may be manufactured in the form of pellets through a cutting process. The pellets may be formed to have various sizes and shapes according to the use purpose of the molded article. The step of packaging after the step of forming the pellet may be further included.

As described above, according to the embodiment of the present invention, a biodegradable resin that is harmless to human contact, meets biodegradability conditions, enables resource circulation, and has excellent mechanical properties including heat resistance, so that it can be effectively applied to heating vessels, etc. A composition, a molded article including the same, and a method of manufacturing the molded article are provided.

The present invention is not limited to the above-described embodiments, but may be manufactured in a variety of different forms, and those of ordinary skill in the art to which the present invention pertains, without changing the technical spirit or essential features of the present invention, It will be appreciated that it can be implemented in a form. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects.

Claims (14)

Polylactide (PLA);
Polyhydroxyl alkanoate (PHA);
Polybutylene succinate (PBS);
Polybutylene adipate- co- terephthalate (PBAT);
Inorganic fillers including both montmorillonite and wollastonite; And
additive; Including,
Based on 100 parts by weight of the biodegradable resin composition, the PHA contains 5 parts by weight or more and 10 parts by weight or less, the PBS contains 5 parts by weight or more and 10 parts by weight or less, and the montmorillonite is 5 parts by weight or more and 15 parts by weight. Including the following, wherein the wollastonite is a biodegradable resin composition comprising 10 parts by weight or more and 15 parts by weight or less. The method of claim 1,
The PLA is a biodegradable resin composition mixing PLLA (poly-L-lactide) and PDLA (poly-D-lactide). The method of claim 1,
The additive is a biodegradable resin composition comprising at least one of a crosslinking agent and a compatibilizer. The method of claim 1,
Based on 100 parts by weight of the biodegradable resin composition, the PLA is a biodegradable resin composition comprising 33 parts by weight or more and 72 parts by weight or less. The method of claim 1,
Based on 100 parts by weight of the biodegradable resin composition, the PBAT is a biodegradable resin composition comprising 5 parts by weight or more and 10 parts by weight or less. delete delete The method of claim 1,
Based on 100 parts by weight of the biodegradable resin composition, the additive is a biodegradable resin composition comprising 2 parts by weight or more and 4 parts by weight or less of a crosslinking agent, and 1 part by weight or more and 3 parts by weight or less of a compatibilizer. As a molded article comprising a biodegradable resin composition,
The biodegradable resin composition is polylactide (PLA);
Polyhydroxyl alkanoate (PHA);
Polybutylene succinate (PBS);
Polybutylene adipate- co- terephthalate (PBAT);
Inorganic fillers including both montmorillonite and wollastonite; And
additive; Including,
Based on 100 parts by weight of the biodegradable resin composition, the PHA contains 5 parts by weight or more and 10 parts by weight or less, the PBS contains 5 parts by weight or more and 10 parts by weight or less, and the montmorillonite is 5 parts by weight or more and 15 parts by weight. A molded article comprising a biodegradable resin composition containing less than or equal to parts, wherein the wollastonite is 10 parts by weight or more and 15 parts by weight or less. The method of claim 9,
The molded article has a heat-resistant temperature of 110°C or more and 120°C or less. Polylactide (PLA); Polyhydroxyl alkanoate (PHA); Polybutylene succinate (PBS); Polybutylene adipate- co- terephthalate (PBAT); Inorganic fillers including both montmorillonite and wollastonite; And additives; Preparing a raw material containing a biodegradable resin composition comprising a;
Mixing the raw materials;
Melt-extruding the mixture in which the raw materials are mixed; And
Cooling the extruded molded article; Including,
The raw material is based on 100 parts by weight of the biodegradable resin composition, the PHA contains 5 parts by weight or more and 10 parts by weight or less, the PBS contains 5 parts by weight or more and 10 parts by weight or less, and the montmorillonite is 5 parts by weight A method for producing a molded article containing more than 15 parts by weight or less, and wherein the wollastonite is 10 parts by weight or more and 15 parts by weight or less. The method of claim 11,
The step of mixing the raw material is a method for producing a molded article by mixing particles having a solid state. The method of claim 11,
The cooling step is a method of manufacturing a molded article proceeding by an air cooling system. The method of claim 11,
The method of manufacturing a molded article further comprising the step of forming a pellet after the step of cooling the molded article.

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