KR101987086B1 - A biodegradable composite resin composition having improved low-temperature processability, a method for producing a composite resin, and a sheet manufacturing method therefor - Google Patents

Abstract

The present invention relates to a biodegradable composite resin composition, a composite resin manufacturing method and a sheet manufacturing method prepared from the low temperature processability, and more specifically PLA (Poly lactic acid), PCL (polycaprolactone), PBS (polybutyl) Styrene succinate), PBAT (poly butylene co- adipate terephthalate), PVAC (poly vinyl acetate), crosslinking agent, the step of powder processing the composite resin composition mixed with a compatibilizer (S10), mixing ( S20), melt extrusion step (S30), cooling, drying step (S40) and packaging step (S50) to produce a composite resin, and the cooled and dried strain T-die extruder for sheet production Melt extrusion step (S500), by rolling the composite resin melt-extruded through the T-die extruder to adjust the thickness and the first cooling to prepare a sheet (S600), the thickness of the primary Cooled sheet By implementing the sheet manufacturing method through the second cooling step (S700) and the step of cutting and packaging the second cooled sheet according to the standard (S800), it is easy to post-process the product in a low temperature state, harmless to bio-contact In addition, the present invention relates to a biodegradable composite resin composition, a composite resin manufacturing method, and a sheet manufacturing method manufactured therefrom, which have a low temperature processability, which not only manufactures a sheet conforming to food contact standards, but also satisfies biodegradation conditions and enables resource recycling. .

Description

Biodegradable composite resin composition having improved low-temperature processability, a method for producing a composite resin, and a sheet manufacturing method therefor}

The present invention relates to a biodegradable composite resin composition, a composite resin manufacturing method and a sheet manufacturing method produced therefrom, which improves low temperature processability, and more particularly, to produce a sheet by improving the main components and manufacturing method, and using the sheet The product (splint) is made after processing at a low temperature of 60 ~ 70 ℃ easy to use and improved convenience, as well as harmless to bio-contact, to produce a sheet that meets food contact standards, biodegradable conditions The present invention provides a biodegradable composite resin and a sheet manufacturing method using the same having improved low temperature processability, which can be used for resource recycling.

In general, synthetic plastics are inexpensive with excellent physical properties, and because of their light properties, they are used for various purposes all over the world.

The synthetic plastic has been used as a main raw material of disposable products discarded after one to several times due to the advantages such as physical properties, convenience, product productivity and price.

However, synthetic plastics have a problem in that their advantages and disadvantages are not easily decomposed, and environmental pollution problems are becoming serious. In recent years, efforts and attempts have been made to reduce the use of disposable products or recycle used plastics.

Substantial partial regulations on the use of disposable plastics have been implemented at home and abroad. In Korea, the Act on the Promotion of Saving and Recycling of Resources (Reg. Regulations and enforcement are in place.

In addition, landfilling, incineration and regeneration methods have been mainly used as the most common treatment methods for synthetic plastics, but these methods cannot fundamentally solve environmental pollution problems.

That is, synthetic plastics have a problem of causing serious environmental pollution during disposal. In addition, due to the depletion of fossil fuels, recent trends have been gradually reducing or limiting their consumption through international regulations, especially in developed countries. In particular, vinyl chloride resin (PVC) has been pointed out the problem of releasing a large amount of dioxins when incinerated. Dioxins have been defined by the World Health Organization as a hereditary Class 1 carcinogen and are reported to have fatal adverse effects on humans and animals.

Therefore, a technique for replacing biodegradable resins that decompose in a natural state has been attempted. Biodegradable resins are naturally decomposed by microorganisms in the soil, for example, polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), aliphatic Polyester resins, poly hydroxy butyric acid (PHBA) and D-3-hydroxy butyric acid (HBA); and the like.

For example, Korean Patent No. 10-0856627 and Korean Patent No. 10-0909776 disclose a technique for manufacturing a sheet using the biodegradable resin as described above.

However, biodegradable resins such as polylactic acid (PLA), polyglycolic acid (PGA), polycaprolactone (PCL), aliphatic polyester resins, polyhydroxy butyric acid (PHBA) and D-3-hydroxy as described above Biodegradable resins such as butyric acid (HBA) have low mechanical properties such as dimensional stability, tensile strength and hardness. In order to reinforce such physical properties, a method of manufacturing a separate reinforcing sheet on a biodegradable resin sheet or adding another general resin or an inorganic filler to the biodegradable resin during extrusion molding of the sheet has been attempted.

For example, Korean Patent Laid-Open Publication No. 10-2009-0087681 discloses a technique for manufacturing a paper material by pressing (laminating).

In Korea Patent Publication No. 10-2011-0068267, a biodegradable resin sheet is prepared by adding a general resin such as aliphatic polyester and titanium oxide to a biodegradable resin, and then laminating a Hanji sheet on one side of the biodegradable resin sheet. Techniques for the manufacture by combining are shown.

However, when laminating a separate reinforcing sheet (paper), as in the Republic of Korea Patent Publication No. 10-2009-0087681, the lamination is difficult due to the lack of adhesion between the biodegradable resin sheet and the reinforcing sheet (paper). And when adding a general resin, such as aliphatic polyester, as in the Republic of Korea Patent Publication No. 10-2011-0068267, this can not be said to be environmentally friendly by the general resin, such as aliphatic polyester.

In addition, the sheet using the conventional biodegradable resin had to be processed at a high temperature in order to form a desired shape, there was a problem that the workability is lowered.

In addition, the sheet using the conventional biodegradable resin has a problem that does not meet the biological contact and food contact standards.

Republic of Korea Patent No. 10-0856627 Republic of Korea Patent No. 10-0909776 Republic of Korea Patent Publication No. 10-2009-0087681 Republic of Korea Patent Publication No. 10-2011-0068267

The present invention has been made in view of the above-described conventional problems, the main components and manufacturing method for forming a composite resin is environmentally improved, as well as the product (Splint) produced using the composite resin 60 ~ 70 ℃ It is an object of the present invention to provide a biodegradable composite resin composition, a composite resin manufacturing method and a sheet manufacturing method produced therefrom having improved low temperature processability to facilitate post-processing at a low temperature of the product to improve product usability.

Another object of the present invention is to provide a biodegradable composite resin composition, a composite resin manufacturing method, and a sheet manufacturing method produced therefrom, which are harmless to biocontact and have improved low temperature processability suitable for food contact standards.

In addition, it is an object of the present invention to provide a method for producing a biodegradable composite resin and composite resin improved low-temperature processability that the composite resin produced by the manufacturing method according to the present invention meets the biodegradable conditions to enable the use of resource circulation. .

Biodegradable composite resin composition with improved low temperature processability to achieve the above object, Poly (lactic acid), PCL (polycaprolactone), PBS (polybutylene succinate), PBAT (polybutylene co- adipate) Terephthalate), PVAC (polyvinyl acetate), crosslinking agent and compatibilizer.

In the present invention, the biodegradable composite resin composition with improved low temperature processability,

28 to 72 weight percent polylactic acid (PLA), 5 to 20 weight percent polycarprolactone (PCL), 5 to 10 weight percent polybutylene succinate (PBS), poly butylene co- adipate terephthalate (PBAT) 5-15% by weight, 10-20% by weight PVAC (polyvinyl acetate), 2-4% by weight crosslinking agent, 1-3% by weight compatibilizer may be melt extruded through an extruder.

In the present invention, the PLA may be stereo complexed PLLA and PLDA isomer.

In the present invention, the PLA is poly-L-lactide, poly-D-lactide and poly-DL-lactide homopolymer or PLA is poly-L-lactide, poly-D-lactide and poly-DL It may be a copolymer comprising lactide.

In the present invention, in the case of the copolymer including the poly-L-lactide, poly-D-lactide and poly-DL-lactide, the poly-D-lactide may be 5 to 10 wt% of the stereo complex. have.

In the present invention, the PVAC (poly vinyl acetate),

It may be selected from the group consisting of PVOH (poly vinyl alcohol) and derivatives or mixtures thereof grafted with a crosslinking agent.

In the present invention, the PBS (polybutylene succinate),

PBSA (poly butylene succinate adipate).

In the present invention, the compatibilizer may be MAH (maleic anhydride).

In the present invention, the biodegradable composite resin manufacturing method,

28 to 72 weight percent polylactic acid (PLA), 5 to 20 weight percent polycarprolactone (PCL), 5 to 10 weight percent polybutylene succinate (PBS), poly butylene co- adipate terephthalate (PBAT) 5 to 15% by weight, 10 to 20% by weight of PVAC (polyvinyl acetate), 2 to 4% by weight of the crosslinking agent, 1 to 3% by weight of a compatibilizer (S10);

Mixing the raw material processed in the powder state with a double blade ribbon blender (S20);

Melt-extruding the mixed raw materials using a twin extruder equipped with a raw material supply device (S30);

Injecting the melt-extruded raw material into the die (Die) and then cooling and drying the strands through the die (S40)

It comprises a step (S50) for packaging the pellet after cooling the strand through the cutting machine.

In the present invention, the standard of the strand,

Density 1.25 ± 0.05 (g / ㎠), tensile strength 50 (Mpa), tensile activity rate 3.5-6 (Gpa), softening temperature 60-70 ℃, shrinkage less than 0.5% and water content 200ppm or less.

In the present invention, in the step of cooling and drying the melt-extruded strand (S40), the processed strand can be cooled by an air cooling system.

Sheet production method using a biodegradable composite resin with improved low-temperature processability for achieving the above object,

28 to 72 weight percent polylactic acid (PLA), 5 to 20 weight percent polycarprolactone (PCL), 5 to 10 weight percent polybutylene succinate (PBS), poly butylene co- adipate terephthalate (PBAT) 5 to 15% by weight, 10 to 20% by weight of PVAC (polyvinyl acetate), 2 to 4% by weight of crosslinking agent, 1 to 3% by weight of compatibilizer (S100);

Mixing the raw material processed in the powder state with a double blade ribbon mixer (S200);

Melt-extruding the mixed raw materials using a twin extruder equipped with a raw material supply device (S300);

Injecting the melt-extruded raw material into a die and then cooling and drying the strands formed through the die (S400);

Melt-extruding the cooled and dried strain using a T-die extruder for manufacturing a sheet (S500);

Rolling the composite resin melt-extruded through the T-die extruder to prepare a sheet by controlling thickness and first cooling (S600);

Second cooling the first cooled sheet in a state in which the thickness is adjusted (S700);

It is configured to include a step (S800) for cutting the secondary cooled sheet to meet the specifications.

In the present invention, by rolling and adjusting the thickness and the primary cooling step (S70), a triaxial roller including a cooling roll may be applied.

As described above, the biodegradable composite resin composition, the composite resin manufacturing method, and the sheet manufacturing method manufactured therefrom having improved low temperature processability of the present invention are easy to use after being processed at a low temperature of 60 to 70 ° C. in a predetermined shape for ease of use. This improvement is, of course, harmless to the biocontact, there is an effect that can produce a sheet conforming to the food contact standards.

In addition, sheets produced through this method also meet the biodegradable conditions to enable resource recycling.

1 is a flow chart showing a method for producing a biodegradable composite resin improved low temperature processability according to a preferred embodiment of the present invention.
Figure 2 is a flow chart showing a sheet manufacturing method using a biodegradable composite resin improved low temperature processability according to a preferred embodiment of the present invention.
Sheet manufacturing method using biodegradable composite resin with improved low temperature processability

The terms or words used in this specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors can appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

The present invention provides a biodegradable composite resin composition, a composite resin manufacturing method and a sheet manufacturing method produced therefrom having improved low temperature processability.

Polylactic acid (PLA), polycaprolactone (PCL), polybutylene succinate (PBS), polybutylene co- adipate terephthalate (PBAT), polyvinyl acetate (PVAC), crosslinking agents, It provides a biodegradable composite resin composition with improved low temperature processability, characterized in that made by mixing a compatibilizer.

In the composite resin composition, 28 to 72% by weight of polylactic acid (PLA), 5 to 20% by weight of polycaprolactone (PCL), 5 to 10% by weight of polybutylene succinate (PBS), and polybutylene (PBAT) 5-15 wt.% Co-adipate terephthalate), 10-20 wt.% PVAC (polyvinyl acetate), 2-4 wt.% Crosslinking agent, 1-3 wt.% Compatibilizer are melt extruded through an extruder.

The biodegradable composite resin is included in the decomposable composite resin in a broad sense, and the degradable composite resin is significantly changed in chemical structure for a certain time under certain environmental conditions by the American Society for Testing And Materials (ASTM). The degradable composite resin is classified into biodegradable, biodegradable (complex degradable), and photodegradable plastics.

In addition, the International Standard Organization (ISO) defines the final biodegradation as the biodegradation of organic matter by the action of microorganisms and finally the production of carbon dioxide, water and inorganic salts / biomaterials. . In the definition of degradable plastics in ISO 472, degradable plastics are classified as biodegradable plastics and degradable plastics.

Such biodegradable plastics are completely decomposed into water, carbon dioxide, methane gas, biomass, etc. within months to years by simply landfilling the plastics used as molded products, packaging materials, hygiene products, agricultural products, etc. Say

In such a composite resin composition, PLA (Poly lactic acid) is less than 28% by weight of the user is difficult to obtain the desired physical properties, when exceeding 72% by weight of the processability of the composite resin is reduced.

In the composite resin composition, the PLA (Poly lactic acid) is suitably 28% by weight to 72% by weight.

In addition, PCL (polycaprolactone) is less than 5% by weight of the tensile strength and yield strength does not reach the level desired by the user, when more than 20% by weight is lowered mechanical properties.

In the composite resin composition, the PCL (polycaprolactone) is suitably 5% by weight to 20% by weight.

In addition, in the composite resin composition, PBS (polybutylene succinate) is significantly less workability of the resin obtained when less than 5% by weight, when it exceeds 10% by weight does not show a difference from the existing resin.

On the other hand, the PBS (poly butylene succinate) can be replaced with PBSA (poly butylene succinate adipate).

At this time, the PLA (Poly lactic acid) is a stereo complex PLLA and the isomer PLDA.

In addition, according to an embodiment of the present invention, the PLA (Poly lactic acid) is poly-L-lactide, poly-D-lactide and poly-DL-lactide homopolymer, or PLA is poly-L-lactide Or a copolymer comprising poly-D-lactide and poly-DL-lactide.

In this case, when the poly-L-lactide, poly-D-lactide, and poly-Dl-lactide-containing oligomers, the poly-D-lactide may be 5 to 10 wt% of the stereo complex.

In addition, the PBAT (polybutylene co- adipate terephthalate) is less than 5% by weight of the mechanical strength and flexibility is lowered, when it exceeds 15% by weight tearing occurs in the mechanical direction (MD). When the PBAT (polybutylene co-adipate terephthalate) is mixed in an appropriate ratio, it has excellent biodegradability and mechanical strength and improved flexibility.

In the composite resin composition, the PBAT (polybutylene co-adipate terephthalate) is suitably 5% by weight to 15% by weight.

In addition, according to an embodiment of the present invention, the PVAC (poly vinyl acetate) may be selected from the group consisting of PVOH (poly vinyl alcohol) and derivatives or mixtures thereof grafted with a crosslinking agent.

The PVAC (poly vinyl acetate) is suitably 10 to 20% by weight.

On the other hand, the compatibilizer is a material for causing strong interfacial adhesion by being present at the interface between the constituent components in the composite system to aid in miscibility or compatibility, PEG (Polyethylene glycol), MA (Maleic anhydrate), GAM ( Glycidil Maleic anhydrade is applied.

The compatibilizer may be applied MAH (maleic anhydride).

Hereinafter, the present invention is described in more detail by the following examples and comparative examples. However, the present embodiment is only illustrative for the purpose of understanding and is not intended to limit the present invention.

Example  One

The biodegradable composite resin composition with improved low temperature processability includes 50% by weight of polylactic acid (PLA), 10% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), and polybutylene co- 15% by weight of adipate terephthalate), 15% by weight of PVAC (polyvinyl acetate), 3% by weight of a crosslinking agent and 2% by weight of a compatibilizer were added to melt pelletized by twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Example  2

The biodegradable composite resin composition with improved low temperature processability includes 50% by weight of polylactic acid (PLA), 15% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), and polybutylene co- 15% by weight of adipate terephthalate), 10% by weight of PVAC (polyvinyl acetate), 4% by weight of crosslinking agent, and 1% by weight of compatibilizer were added to melt pelletized by twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Example  3

The biodegradable composite resin composition with improved low temperature processability includes 50% by weight of polylactic acid (PLA), 20% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), and polybutylene co- 10% by weight of adipate terephthalate), 10% by weight of PVAC (polyvinyl acetate), 2% by weight of crosslinking agent, and 3% by weight of compatibilizer were added to melt pelletized by twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Example  4

The biodegradable composite resin composition with improved low temperature processability includes 50% by weight of polylactic acid (PLA), 15% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), and polybutylene co- 5% by weight of adipate terephthalate), 20% by weight of PVAC (polyvinyl acetate), 4% by weight of crosslinking agent, and 1% by weight of compatibilizer were added to pelletize by melt extrusion with a twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Example  5

The biodegradable composite resin composition with improved low temperature processability includes 50% by weight of polylactic acid (PLA), 5% by weight of polycaprolactone (PCL), 10% by weight of polybutylene succinate (PBS), and polybutylene co- 15% by weight of adipate terephthalate), 15% by weight of PVAC (polyvinyl acetate), 4% by weight of crosslinking agent, and 1% by weight of compatibilizer were added to melt pelletized by twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Comparative example  One

The biodegradable composite resin composition with improved low temperature processability is 100% by weight of polylactic acid (PLA), 0% by weight of polycaprolactone (PCL), 0% by weight of polybutylene succinate (PBS), and polybutylene co- 0% by weight of adipate terephthalate), 0% by weight of PVAC (polyvinyl acetate), 0% by weight of crosslinking agent, and 0% by weight of compatibilizer were added to pelletize by melt extrusion with a twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Comparative example  2

Biodegradable composite resin composition with improved low temperature processability: 85% by weight of polylactic acid (PLA), 0% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), polybutylene co- 5% by weight of adipate terephthalate), 5% by weight of PVAC (polyvinyl acetate), 0% by weight of crosslinking agent and 0% by weight of compatibilizer were added to pelletize by melt extrusion with a twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Comparative example  3

Biodegradable composite resin composition with improved low temperature processability: 75% by weight of polylactic acid (PLA), 5% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), polybutylene co- 5% by weight of adipate terephthalate), 5% by weight of PVAC (polyvinyl acetate), 4% by weight of crosslinking agent, and 1% by weight of compatibilizer were added to melt pelletized by twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Comparative example  4

The biodegradable composite resin composition with improved low temperature processability includes 65% by weight of polylactic acid (PLA), 5% by weight of polycaprolactone (PCL), 5% by weight of polybutylene succinate (PBS), and polybutylene co- 10 wt% of adipate terephthalate), 12 wt% of PVAC (polyvinyl acetate), 2 wt% of a crosslinking agent, and 1 wt% of a compatibilizer were added to pelletize by melt extrusion with a twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

Comparative example  5

Biodegradable composite resin composition with improved low temperature processability includes 55% by weight of polylactic acid (PLA), 5% by weight of polycaprolactone (PCL), 10% by weight of polybutylene succinate (PBS), and polybutylene co- 10% by weight of adipate terephthalate), 15% by weight of PVAC (polyvinyl acetate), 2% by weight of crosslinking agent, and 3% by weight of compatibilizer were added to pelletize by melt extrusion with a twin screw extruder.

Next, the pellet obtained was molded at 23 ° C. according to ASTM D256 at 3.2 ° C., and the notched Izod impact strength of each bar was measured according to ASTM D256.

PLA
(weight%) PCL
(weight%) PBS
(weight%) PBAT
(weight%) PVAC
(weight%) Cross linking agent
(weight%) Compatibilizer
(weight%)
Example 1

50
10
5
15
15
3
2
Example 2

50
15
5
15
10
4
One
Example 3

50
20
5
10
10
2
3
Example 4

50
15
5
5
20
4
One
Example 5

50
5
10
15
15
4
One
Comparative Example 1

100
0
0
0
0
0
0
Comparative Example 2

85
0
5
5
5
0
0
Comparative Example 3

75
5
5
5
5
4
One
Comparative Example 4

65
5
5
10
12
2
One
Comparative Example 5

55
5
10
10
15
2
3

The impact strength of the bar processed by the pellet-type biodegradable composite resin prepared in Examples 1 to 5 and Comparative Examples 1 to 5 was measured and evaluated, and the results are shown in Table 2.

In addition, the biodegradable composite resin is melt-kneaded at 170 to 190 ° C with a single screw extruder (L / D: 40, diameter 35mm) to process a 3mm thick sheet, and then cut with a laser cutting machine according to the splint specifications. Using a water tank equipped with a temperature controller, adjust the temperature to 70 ℃, immerse the cut sheet for 60 seconds, and mold it on the mock-up. Measure the formability by time and divide it into 4 grades as follows. Evaluated.

Impact strength (J / m)

Formability evaluation
Example 1

463
Very good
Example 2

423
Very good
Example 3

342
good
Example 4

368
good
Example 5

512
Good
Comparative Example 1

63
usually
Comparative Example 2

93
usually
Comparative Example 3

118
Good
Comparative Example 4

152
Good
Comparative Example 5

321
good

In Table 2, the biodegradable composite resins prepared in Examples 1 to 5 were found to have superior impact strength compared to the biodegradable composite resins prepared in Comparative Examples 1 to 5, and also in Examples 1 to 5 in evaluation of moldability. The prepared biodegradable composite resin was found to have excellent moldability evaluation.

Also, after processing the sheet, the molding grade of the splint is

Molding time 30 ~ 60 seconds: Very good

Molding time 60 ~ 100 seconds: Good

Molding time 100 ~ 200 seconds: Good

Molding time over 200 seconds: Normal

Appeared to be.

Hereinafter, a method of preparing a composite resin using the biodegradable composite resin composition having improved low temperature processability will be described in detail.

1 is a flow chart showing a method for producing a biodegradable composite resin with improved low temperature processability according to a preferred embodiment of the present invention.

Referring to Figure 1, the low temperature processability improved biodegradable composite resin manufacturing method powder processing step (S10), mixing step (S20), melt extrusion step (S30), cooling, drying step (S40) and packaging A step S50 is made.

Powder Processing Step

First, the raw materials used in the production of the composite resin are PLA (poly lactic acid), PCL (polycaprolactone), PBS (polybutylene succinate), PBAT (polybutylene co- adipate terephthalate), PVAC (poly Vinyl acetate), crosslinking agents, compatibilizers.

More specifically, the PLA (Poly lactic acid) 28 to 72% by weight, PCL (polycaprolactone) 5 to 20% by weight, PBS (polybutylene succinate) 5 to 10% by weight, PBAT (polybutylene co-adi Pate terephthalate) 5-15 wt%, PVAC (polyvinyl acetate) 10-20 wt%, 2-4 wt% crosslinking agent, 1-3 wt% compatibilizer.

Thereafter, mixing the powder having particles of a predetermined size,

At this time, the equipment for mixing them uses a double blade ribbon mixer.

In the present invention, the equipment used for the mixing of the first workpiece and the remaining raw materials is embodied as a double blade ribbon mixer, but any equipment may be applied as long as the equipment is used to mix various raw materials according to the embodiment.

Melt extruding the mixture,

Next, the mixture is melt extruded and processed using a twin extruder equipped with a raw material feeder.

Twin extruder used for melt extrusion of the mixture is a general known technique used for melt extrusion of the material, a detailed description thereof will be omitted.

Cooling and drying the melt-extruded raw material,

Next, the raw material extruded through a twin extruder equipped with the raw material feeder is put into a die, and the strands exited through the die are cooled and dried.

At this time, the cooling and drying of the strand may be generally applied to water-cooled and air-cooled.

Here, the water-cooled type requires secondary drying of the PLA composite resin.

In the present invention, an air-cooled cooling drying method, which is an integrated cooling and drying method, is applied.

The strand processed through the extruder will have a predetermined temperature. This cools the strand temperature in the cooling and drying steps.

Applying an air cooling system in the cooling and drying step of the strand is to implement an eco-friendly manufacturing method by reducing the power and time by eliminating the drying step after cooling.

The air cooling system for cooling the strand is a general known technique used when cooling an object, and a detailed description thereof will be omitted.

Meanwhile, in the present invention, the equipment applied to the sheet cooling is embodied as an air cooling system, but any equipment may be applied as long as the equipment is used to cool the object according to the embodiment. In addition, in the case of water-cooled, air-cooled is applied in the present invention because it must go through a drying step.

Packing step,

The cooled strand is packaged after pelletizing.

Here, the standard of the strand,

Density 1.25 ± 0.05 (g / ㎠), tensile strength 50 (Mpa), tensile activity rate 3.5-6 (Gpa), softening temperature 60-70 ℃, shrinkage less than 0.5% and water content 200ppm or less.

In addition, in the step of cooling and drying the melt-extruded strand (S40), the processed strand may be cooled by an air cooling system.

Thus, the biodegradable composite resin with improved low-temperature processability of the present invention and the composite resin produced through the manufacturing method of the product commercialized by using the material through the improvement of the main raw material components and the manufacturing method using the same of 60 ~ 70 ℃ It can be easily processed at low temperature, harmless to biocontact, and meets biodegradable condition with composite resin that meets food contact standard to enable resource recycling.

Hereinafter, a sheet manufacturing method using the biodegradable composite resin with improved low temperature processability will be described in detail.

Figure 2 is a flow chart showing a sheet manufacturing method using a biodegradable composite resin with improved low temperature processability in accordance with a preferred embodiment of the present invention.

2, the sheet manufacturing method using a biodegradable composite resin with improved low temperature processability

28 to 72 weight percent polylactic acid (PLA), 5 to 20 weight percent polycarprolactone (PCL), 5 to 10 weight percent polybutylene succinate (PBS), poly butylene co- adipate terephthalate (PBAT) 5 to 15% by weight, 10 to 20% by weight of PVAC (polyvinyl acetate), 2 to 4% by weight of crosslinking agent, 1 to 3% by weight of compatibilizer (S100) and

Mixing the raw material processed in the powder state with a double blade ribbon mixer (S200) and

Melt-extruding the mixed raw material using a twin extruder equipped with a raw material supply device (S300) and

Injecting the melt-extruded raw material into the die (Die) and then cooling and drying the strands through the die (S400) and

Melt-extruding the cooled and dried strain using a T-die extruder for producing a sheet (S500).

The (S100) to (S400) has the same method as the (S10) to (S40) of the biodegradable composite resin manufacturing method is always improved low temperature workability.

Step of manufacturing sheet

Rolling the composite resin melt-extruded through the T-die extruder to control the thickness and primary cooling to prepare a sheet. (S600)

Extruder used in the sheet manufacturing method of the present invention can be applied to any extruder if the general sheet manufacturing extruder.

The rolling by adjusting the thickness and the primary cooling step (S70) may be applied to a triaxial roller including a cooling roll.

In addition, since the process guide is common in the sheet manufacturing is possible to control the optimal melting temperature will be omitted detailed description thereof.

Herein, the standard of the sheet suitable for the present invention is

Density 1.25 ± 0.05 (g / ㎠)

Tensile Strength 50 (Mpa)

Tensile Activity 3.5 ~ 6 (Gpa)

Softening Temperature 60 ~ 70 ℃

Shrinkage less than 0.5% and

The water content should be within the range of 200ppm or less.

Thereafter, the second cooling step

The first cooled sheet is second-cooled while the thickness is adjusted. (S700)

After that, packing

The secondary cooled sheet is cut and packed according to a standard. (S800)

The present invention is a composite resin produced by the biodegradable composite resin and composite resin manufacturing method with improved low temperature processability is improved environmentally the main raw material components and the manufacturing method using the same, as well as the product using the composite resin produced in this way 60 ~ 70 Easy post-processing at low temperature of ℃, harmless to bio-contact and suitable for food contact standards, as well as meet the biodegradable conditions to enable the use of resource circulation.

Claims (13)

Polylactic acid (PLA), polycaprolactone (PCL), polybutylene succinate (PBS), polybutylene co-adipate terephthalate (PBAT), polyvinyl acetate (PVAC), crosslinking agents, compatibilizers Mixed,
28 to 72 weight percent polylactic acid (PLA), 5 to 20 weight percent polycarprolactone (PCL), 5 to 10 weight percent polybutylene succinate (PBS), poly butylene co- adipate terephthalate (PBAT) 5 to 15% by weight, 10 to 20% by weight of PVAC (polyvinyl acetate), 2 to 4% by weight of crosslinking agent, 1 to 3% by weight of compatibilizer are melt-extruded through an extruder,
The PLA is a copolymer comprising poly-L-lactide, poly-D-lactide and poly-DL-lactide,
The compatibilizer is MAH (maleic anhydride), biodegradable composite resin composition with improved low temperature processability.
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