KR102046799B1 - Biodegradable film for filter for sink drain with insect repellent effect and high tearing strength - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for sink sieves, and more particularly, to a biodegradable film for sink sieves having excellent biodegradability and having a pest control effect and excellent tear strength. Specifically, the biodegradable film for sink sieve of the present invention is 5 to 30% by weight of polylactic acid, 10 to 30% by weight of polybutylene succinate, polybutylene adipate-co-butylene terephthalate 50 To 75% by weight, 1 to 15% by weight of thermoplastic starch, 5 to 15% by weight of the first additive, and 0.1 to 10% by weight of the second additive, and has excellent biodegradability and a tear strength of 80 kgf / cm ² or more. It contains cinnamon oil and has excellent pest control effect.

Description

Biodegradable film for sink sieve with excellent pest control effect and tear strength {BIODEGRADABLE FILM FOR FILTER FOR SINK DRAIN WITH INSECT REPELLENT EFFECT AND HIGH TEARING STRENGTH}

The present invention relates to a film for sink sieves, and more particularly, to a biodegradable film for sink sieves with excellent biodegradability and excellent pest control effect and tear strength.

Food waste generated during washing is left in the kitchen sink drain, which is thrown away in a plastic garbage bag. However, since the food waste left in the drain contains a large amount of water, it is inconvenient to carry it in a plastic bag. In order to compensate for this problem, a method of installing a sieve in the sink drain and disposing of the collected waste together with the sieve has been used. However, since the existing sieve uses a general film, there is an inconvenience that the sieve and the food waste must be disposed separately.

In this regard, in Korean Patent Laid-Open Publication No. 2005-0091877, the strainer is separated into a support part and a filter part, and if the dirt is volume, the filter part is separated and discarded together with the dirt from the support part, and the filter part is made of a vinyl material having a plurality of drain holes perforated. Disclosed a strainer consisting of.

Regarding the biodegradable film, Korean Patent Publication No. 2014-0076359 discloses a biodegradable resin film including a biodegradable polymer, a hydrophilic natural material, and a graft copolymer of a biodegradable polymer and an acid anhydride. In addition, Korean Patent Publication No. 2014-0075468 discloses a biodegradable packaging material including polylactic acid, polybutylene succinate, polybutylene adipate-terephthalate copolymer, and an inorganic additive.

The present invention solves the above-mentioned problems of food waste disposal in the sink sink, biodegradable and environmentally friendly, pest control is hygienic, with the object of providing a biodegradable film for sink sieve excellent tear strength. do.

The above problems are 5 to 30% by weight of polylactic acid, 10 to 30% by weight of polybutylenesuccinate, 50 to 75% by weight of polybutylene adipate-co-butylene terephthalate, and 1 to 1 part by weight of the total film weight. A biodegradable film for a sink sieve comprising 15% by weight, 5-15% by weight of the first additive and 0.1-10% by weight of the second additive.

Preferably, the first additive may be one selected from the group consisting of calcium carbonate, silica and talc.

Also preferably, the second additive may be at least one oil selected from the group consisting of cinnamon oil, eucalyptus oil, citronella oil, penny royal oil, lavender oil, lemongrass oil and thyme oil.

Also preferably, the film is a single layer film produced by a single layer blow coextrusion method using a twin screw extrusion mixer, and the thickness of the film may be 30 to 100 μm.

The biodegradable film for the sieve sieve screen of the present invention is excellent in biodegradability and eco-friendly, and can be thrown away in a plastic bag with food waste, and is easy to use, and also includes a herb oil having an insecticidal effect in the film. Can prevent influx and reproduction.

All technical terms used in the present invention, unless defined otherwise, have the following definitions and conform to the meanings commonly understood by those skilled in the art in the relevant field of the present invention. In addition, although a preferred method or sample is described herein, similar or equivalent things are included in the scope of the present invention. The contents of all publications described herein by reference are incorporated into the present invention. The term about refers to 30, 25, 20, 15, 10, 9, 8, 7, 6, 5, 4, for reference quantities, levels, values, numbers, frequencies, percentages, dimensions, sizes, quantities, weights, or lengths. By amount, level, value, number, frequency, percentage, dimension, size, amount, weight or length, varying by 3, 2 or 1%.

Throughout this specification, the terms including and including, unless included otherwise, include the steps or components set forth, or groups of steps or components, but any other steps or components, or steps or components It should be understood that this group is not excluded.

The biodegradable film for the sink sieve of the present invention is polylactic acid (PLA), polybutylenesuccinate (PBS), polybutylene adipate-co-butylene terephthalate (Poly butyleneadipate-co-butyleneterephthalate , PBAT), thermoplastic starch (TPS), first and second additives.

 Preferably, 5 to 30% by weight of polylactic acid, 10 to 30% by weight of polybutylenesuccinate, 50 to 75% by weight of polybutylene adipate-co-butylene terephthalate, and 1 to 15 thermoplastic starch It is preferred to include by weight, 5-15% by weight of the first additive and 0.1-10% by weight of the second additive.

The polylactic acid is a biodegradable resin, preferably 5 to 30% by weight based on the total weight of the film, more preferably 5 to 20% by weight. If the polylactic acid content is less than 5% by weight, the biodegradation properties are lowered, and if it exceeds 30% by weight, the workability during extrusion is poor and the elongation and tear strength of the final film is low. In this case, when used, food waste may cause holes or tears in the film.

The polybutylene succinate is a biodegradable resin, preferably 10 to 30% by weight based on the total weight of the film, more preferably 10 to 20% by weight. If the polybutylene succinate content is less than 10% by weight, the heat resistance to boiling water is low and the tensile strength is lowered, and if it exceeds 30% by weight, the elongation and tear strength of the final film is lowered. In this case, when used, food waste may cause holes or tears in the film.

The polybutylene adipate-co-butylene terephthalate is a biodegradable resin, it is preferably included in 50 to 75% by weight relative to the total weight of the film, more preferably 50 to 70% by weight. If the polybutylene adipate-co-butylene terephthalate content is less than 50% by weight, the extinguishing and tearing strength is low, and in use, the film may be punctured or torn by food waste. When it exceeds 70 weight%, the softness of a film becomes high and extrusion workability worsens.

The thermoplastic starch is preferably included in 1 to 15% by weight, more preferably 3 to 10% by weight relative to the total weight of the film. When the thermoplastic starch content is less than 1% by weight, the biodegradability is poor, and when the thermoplastic starch content is more than 15% by weight, foaming occurs during compounding, and extrusion workability is poor during blown film production.

The first additive is preferably one selected from the group consisting of calcium carbonate, silica and talc, and more preferably talc. The first additive is preferably included in 5 to 15% by weight, more preferably 5 to 10% by weight relative to the total weight of the film. If the first additive content is less than 5% by weight, the film opening properties are poor in blown extrusion production, making it difficult to control the compression operation, and the matte properties are lowered, resulting in poor appearance of the film. If it exceeds 15% by weight, blown extrudability is poor, and film properties such as film tensile strength, tear strength, and heat resistance are lowered, so that, in use, the film may be punctured or torn by food waste.

The second additive is preferably at least one herbal oil selected from the group consisting of cinnamon oil, eucalyptus oil, citronella oil, penny royal oil, lavender oil, lemongrass oil and thyme oil, and more preferably cinnamon oil. Can be used. Preferably the second additive may further comprise 0.1 to 10% by weight based on the total weight of the film, more preferably 1 to 5% by weight. If the content of the herbal oil is less than 0.1% by weight, the pest control effect is insignificant, and when the content of the herbal oil exceeds 10% by weight, the product cost is high.

Biodegradable film of the present invention made of the composition has a tear strength of 80 kgf / cm ² Excellent physical properties above

The biodegradable film for the sink sieve of the present invention can be prepared by a mono-layer blown, 2-layer blown or 3-layer blown coextrusion method. Preferably, it may be prepared by a single layer blown coextrusion method.

The single layer blown coextrusion method may use a twin screw compounder. The twin screw extruder is a machine for continuously mixing and extruding film resin and additives by heating and flowing the resin, a hopper installed at the inlet of the main body, a screw for transporting the raw material in the main body, and a barrel surrounding the screw. and a die at the body outlet. The barrel has a pressure-resistant structure that can withstand hundreds of atmospheres and can be divided into several units to control the temperature of each part (Feeding Section, Compression Section, Metering Section). In addition, the resin and additives in the barrel are processed by receiving thermal energy from the barrel wall and shear energy from the screw, and the die determines the shape of the final product.

The twin screw extruder is superior to the dry blending or single screw extruder that mixes the biodegradable resin and the additive without applying water or heat, and has excellent physical properties of the produced film due to the high dispersibility of the film raw material. Particularly in the case of co-rotating full engagement type, sufficient mixing of resin and additives, raw material retention on the screw surface, and pressure distribution in the extrusion mixer are relatively uniform.

Preferably the thickness of the biodegradable film for sink sieves of this invention is 30-100 micrometers, More preferably, it is 40-80 micrometers. If the thickness of the film is less than 30 μm, the tensile strength, tear strength and elongation may deteriorate, so that the film may be punctured or torn in use. If the thickness of the film exceeds 100μm, the cost competitiveness is low.

The biodegradable film of the present invention may comprise a plurality of perforations for draining water from the strainer. The number or shape of the perforations is not particularly limited.

Hereinafter, the present invention will be described in detail with reference to Examples, but the scope of the present invention is not limited by these Examples.

Example  1 to 4 and Comparative example  1 to 8

A 50 μm thick single layer extruded film was prepared using the compositions described in Table 1 below. The single layer extruded film is a single layer extruder using a twin screw compounder consisting of a hopper, a screw, a barrel surrounding the screw, and a die at the body outlet. New coextrusion method Prepared using a three-layer blow method.

Comparative Example 10 is a polyethylene film having a thickness of 50 μm. Mono-layer blown extrusion used at least one resin of LDPE and LLDPE.

In Table 1, polylactic acid (PLA) may use a 2003D or 4032D grade of NatureWork, and in this example, the 2003D grade was used. As polybutylene succinate (PBS), EnPol's F4560 or Geosol Tech's SOLPOL-500 and the like can be used. In this embodiment, EnPol's F4560 was used. As polybutylene adipate-co-butylene terephthalate (PBAT), EnPol's PBG7070 or BASF's Ecoflex and the like can be used. In this embodiment, EnPol's PBG7070 was used. Thermoplastic starch (TPS) may be used Regreen of the target company or TPS of the English company, in this embodiment was used Regreen of the target company. In addition, talc was used as the first additive and cinnamon oil was used as the second additive.

(Unit: weight%) division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 PLA 5 10 5 5 0 35 10 PBS 10 10 17 15 15 10 5 PBAT 69.5 63 60 60 70 45 70 TPS 5 5 5 5 5 5 5 Talc 10 10 10 10 10 5 10 Cinnamon
oil 0.5 2 3 5 - - - Manufacturing method Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound division Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 PLA 5 10 5 5 5 10 Polyethylene Film (50 μm) PBS 40 10 10 15 10 10 PBAT 40 65 55 73 45 65 TPS 5 0 20 5 5 5 Talc 10 15 10 2 35 10 Cinnamon
oil - - - - - - Manufacturing method Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Twin screw extrusion
Compound Blending

Experimental Example 1

Tensile strength, elongation, shrinkage (MD, TD), deep drawing and biodegradability of the films prepared in Examples 1 to 4 and Comparative Examples 1 to 10 were measured. The measurement results are shown in Table 2 below.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 The tensile strength
(kgf / cm ² ) 286 302 314 278 98 248 211 142 243 123 250 65 Extrusion workability
Thin film
Property measurement not possible 270 % Elongation 490 470 440 455 400 112 395 220 395 274 400 70 430 Tear strength
(kgf / cm ² ) 88 86 85 82 56 23 55 32 59 42 60 16 80 Gloss meter 25 21 23 34 18 16 14 17 21 19 5 106 20 film
Openness Great Great Great Great Good Good Good Good Great a little
Thirteen Thirteen Great Good Test substance compared to standard substance
Biodegradability
(%) 69 64 66 68 53 60 57 60 49 60 60 22 2

-Tensile strength and elongation: measured by UTM equipment (Testwon, 2006) in accordance with ASTM D 882 standards.

-Tear strength: Measured by UTM equipment (Testwon, 2006) according to ASTM D1004 standard.

Gloss Meter: Measured using Gloss Meter according to ASTM D523 standard.

Film openness: A human hand judged whether the film was open.

-Biodegradability: Film biodegradation was measured under composting conditions by requesting from KTR (Korea Research Institute of Chemical Technology). The amount of carbon dioxide produced under composting conditions is measured by titrimetry for 45 days. The biodegradability of the test substance relative to the standard is the average biodegradation calculated from the cumulative amount of carbon dioxide produced.

Table 2 shows that the biodegradable films of Examples 1 to 4, including polylactic acid, polybutylene succinate, polybutylene adipate-co-butylene terephthalate, thermoplastic starch and additives within the content range of the present invention, are excellent. It can be seen that it has tensile strength, elongation and tear strength, and film opening property and biodegradation are also excellent.

On the other hand, when the polylactic acid is not included at all (Comparative Example 1), the tensile strength and tear strength are significantly lowered and the biodegradability is also poor, and when the polylactic acid is contained in excess of 30% by weight (Comparative Example 2), The tear strength was significantly reduced, making it inappropriate for use as a sink sieve film.

In addition, when the polybutylene adipate-co-butylene terephthalate is included in less than 50% by weight, and the amount of the additive is more than 15% by weight (Comparative Example 8), the tensile strength, tear strength and elongation are all Bad and biodegradable is also bad.

In addition, in the case of Comparative Example 9, which includes each component within the content range of the present invention, but was manufactured by dry blending rather than single-layer blown coextrusion using a twin screw extruder, the physical properties of the film itself could not be measured.

Experimental Example  2

Pest control effects of the films prepared in Examples 1 to 4 and Comparative Examples 1 to 10 were measured and the results are shown in Table 3.

Determination of the pest control effect was carried out by cutting the film of Examples and Comparative Examples into A4 size in a 30 x 30 x 20 cm transparent box, placing 50 g of ripened apples on the film, and then covering the box with a transparent wrap and 10 holes. Drill through. Count the number of fruit flies in the box over time.

time Drosophila Example 1 Example 2 Example 3 Example
4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative example
9 Comparative example
10 1Hr dog 0 0 0 0 3 2 4 3 One 4 3 2 Measure
Impossible 4 6Hr One 0 0 0 11 9 13 11 8 14 10 8 12 12Hr 2 One 0 0 18 21 20 21 22 25 18 20 17 24Hr 4 3 One 0 29 29 26 29 32 33 31 29 26 48Hr 9 6 3 One 41 38 39 35 44 42 36 38 36

Looking at the Table 3, it can be confirmed that the films of Examples 1 to 4 containing cinnamon oil have excellent insect suppression effects because little flies are observed until 24 hours have elapsed. On the contrary, in the films of Comparative Examples 1 to 8 and Comparative Example 10 containing no cinnamon oil, fruit flies began to be observed after 1 hour and significantly more pests were observed over time. In the case of Comparative Example 9, it was difficult to produce a film due to the extrusion workability deterioration did not proceed to the pest control effect test.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Claims (5)

5 to 30% by weight of polylactic acid, 10 to 30% by weight of polybutylenesuccinate, 50 to 75% by weight of polybutylene adipate-co-butylene terephthalate, 1 to 15% by weight of thermoplastic starch, 1 to 5 to 15% by weight of the additive and 0.1 to 10% by weight of the second additive,
The second additive is at least one selected from the group consisting of cinnamon oil, eucalyptus oil, citronella oil, penny royal oil, lavender oil, lemongrass oil and thyme oil,
Tear strength according to ASTM D1004 is 80 kgf / ㎠ or more,
Biodegradable film for sink strainers, Gloss Meter according to ASTM D523 ranges from 21 to 34. The biodegradable film for a sink strainer according to claim 1, wherein the first additive is one selected from the group consisting of calcium carbonate, silica and talc. delete The biodegradable film for a sink strainer according to claim 1, wherein the film is a single layer film prepared by a single layer blown coextrusion method using a twin screw extrusion mixer. The biodegradable film according to claim 1, wherein the film has a thickness of 30 to 100 μm.