KR101778629B1 - Eco-friendly heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same - Google Patents
Eco-friendly heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same Download PDFInfo
- Publication number
- KR101778629B1 KR101778629B1 KR1020150174214A KR20150174214A KR101778629B1 KR 101778629 B1 KR101778629 B1 KR 101778629B1 KR 1020150174214 A KR1020150174214 A KR 1020150174214A KR 20150174214 A KR20150174214 A KR 20150174214A KR 101778629 B1 KR101778629 B1 KR 101778629B1
- Authority
- KR
- South Korea
- Prior art keywords
- polyester resin
- resistant material
- density
- heat resistant
- packaging container
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
- B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
- B65D81/3453—Rigid containers, e.g. trays, bottles, boxes, cups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
-
- C08J7/047—
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2390/00—Containers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The present invention relates to an environment-friendly heat-resistant material and a packaging container containing the same, and the interior material according to the present invention can be produced by a simple process of extruding and foaming a polyester resin, Heat resistance, heat insulation and strength can be simultaneously realized.
Description
The present invention relates to an environmentally friendly heat resistant material and a packaging container containing the same.
Products that are normally used as food containers are divided into a foam type and a non-pour type. The foamed product is a product obtained by mixing polystyrene with a foaming gas and extruding it, which has the advantages of maintaining a relatively thick thickness, and maintaining shape, insulation, and cost competitiveness, but has a disadvantage in that harmful substances are detected at high temperatures. In the case of non-foaming containers, products made of thermally stable polypropylene, polyethylene, or polyester film are used, and it is advantageous that the rate of dimensional change at low temperature is low and harmful substances are not detected. However, There is a drawback that does not.
In the past, polystyrene foam containers have been used, but the point that harmful substances are detected at high temperatures has been replaced by paper containers, which are used as disposable heat-resistant containers, .
As modern life becomes more convenient in modern society, the use of disposable products increases, and the demand for food for delivery and convenience food is gradually increasing. Accordingly, the demand for food packaging container is increasing, have. Therefore, there is a need to study packaging containers having convenience, safety, and environmentally friendly performance so that they can be easily cooked using a microwave oven.
The present invention relates to a heat resistant material having excellent heat resistance and dimensional stability, and is intended to provide a heat resistant material having excellent dimensional stability, light weight, heat insulation and strength even in a microwave oven which outputs high power.
The present invention can provide an environmentally friendly heat resistant material and a packaging container containing the same.
As one example of the heat resistant material,
A polyester resin foam having an average thickness of 0.2 to 20 mm,
The thermal conductivity is 0.04 W / mK or less,
It is possible to provide a heat resistant material satisfying the following formula (1).
[Equation 1]
X / Y ≥ 1.5
Wherein X represents the flexural strength (N / cm 2 ) of the polyester resin foam according to KS M ISO 844 and Y represents the density (kg / m 3 ) of the polyester resin foam according to KS M ISO 845 .
Further, the present invention can provide a packaging container containing the heat resistant material.
The interior material according to the present invention can be produced by a simple process of extruding and foaming a polyester resin, so that environmental hormone is not released due to an environment-friendly material, and excellent lightweight, heat resistance, heat insulation and strength can be realized at the same time.
Figure 1 is a photograph of the result for a dimensional strain measurement experiment in one embodiment.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.
It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
In the present invention, the term "cell" means a microstructure expanded by foaming in a polymer.
Hereinafter, the present invention will be described in detail.
The present invention relates to a heat-resistant material having excellent heat resistance and strength, a method for producing the same, and a packaging container containing the same,
A polyester resin foam having an average thickness of 0.2 to 20 mm,
The thermal conductivity is 0.04 W / mK or less,
It is possible to provide a heat resistant material satisfying the following formula (1).
[Equation 1]
X / Y ≥ 1.5
Wherein X represents the flexural strength (N / cm 2 ) of the polyester resin foam according to KS M ISO 844 and Y represents the density (kg / m 3 ) of the polyester resin foam according to KS M ISO 845 .
Specifically, the manufactured heat resistant material includes a thin polyester resin foam having an average thickness of 0.2 to 20 mm, and is eco-friendly and lightweight, and has excellent thermal insulation with a thermal conductivity of 0.04 W / mK or less. By satisfying the formula (1), the ratio of the density to the bending strength can be excellent.
For example, the average thickness of the heat resistant material may be 0.2 to 10 nm, 0.2 to 5 nm, or 1 to 3 nm, thereby achieving excellent light weight.
Further, the thermal conductivity of the heat resistant material may be 0.04 W / mK or less. For example, the thermal conductivity of the heat resistant material may range from 0.01 to 0.04 W / mK, from 0.01 to 0.035 W / mK, or from 0.02 to 0.035 W / mK. The heat resistant material according to the present invention has thermal conductivity within the above range, so that excellent heat insulating property can be realized.
Such a thermal conductivity can be controlled by varying the degree of foaming in the foaming process of the polyester resin foam. As a result, when a heat-resistant material having excellent heat insulation is used as a packaging container for food or the like, it can be easily preserved or preserved in food.
In the formula (1), X represents the flexural strength (N / cm 2 ) of the polyester resin foam according to KS M ISO 844, and Y represents the flexural strength (Kg / m 3 ) of the ester resin foam.
Specifically, the heat resistant material includes a polyester resin foam, thereby achieving excellent heat resistance and strength as well as excellent light weight.
As an example, the ratio of the density to the bending strength of the resin foam may satisfy the expression (1). For example, the ratio of density to flexural strength of the resin foam may be in the range of 1.5 or more, 1.5 to 2, 1.5 to 1.8 or 1.5 to 1.7. The heat resistant material according to the present invention can achieve a heat resistant material having high heat resistance and high strength while having a relatively high foaming magnification by satisfying the density to bending strength ratio of the resin foam within the above range.
In the above formula (1), X may be 30 to 350 N / cm 2 , and Y may be 20 to 230 kg / m 3 . For example, X (flexural strength) may be in the 40 to 300 N / cm 2, 60 to 200 N / cm 2, 90 to 110 N / cm 2, 90 to 100 N / cm 2 range, Y (density) May range from 25 to 200 kg / m 3 , from 30 to 150 kg / m 3 , from 40 to 75 kg / m 3 , from 50 to 75 kg / m 3, or from 55 to 65 kg / m 3 .
At this time, the polyester resin can be produced by condensation polymerization reaction of 1,4-butanediol with terephthalic acid. The polyester resin according to the present invention includes both aromatic and aliphatic polyesters. In another aspect, the polyester resin includes a flame retardant polyester, a biodegradable polyester, an elastic polyester, and a reusable polyester. For example, the resin foam according to the present invention may be a PET (polyethylene terephthalate) foam. By using the PET, it is eco-friendly and can be easily reused.
Based on the standards of the Agency for Food, Drug, and Foodstuffs, packaging materials and their raw materials,
When the elution standard is measured, the total elution amount is 30 ppm or less, and antimony germanium, terephthalic acid, isophthalic acid, acetaldehyde substances are not detected,
It is characterized by the absence of volatiles in the residual measurement.
Specifically, the heat resistant material according to the present invention, as described above, is made of a polyester resin which is an eco-friendly material, so that the concern described in the Standard & Specification Notice 2015-7 issued by the Food and Drug Administration Materials can be adjusted to within acceptable limits.
By manufacturing the food container using the heat resistant material using such a material, an environmentally friendly food container can be provided.
The compressive strength (KS M ISO 844) of the heat resistant material may be 20 to 300 N / cm 2 . Specifically, the heat resistant material has a compressive strength of 20 to 250 N / cm 2 , 30 to 150 N / cm 2 , 40 to 75 N / cm 2 , 45 to 75 N / cm 2 or 55 to 70 N / cm 2 Lt; / RTI > For example, in the case of bead foaming, a method in which a bead-shaped resin is put into a metal mold and foaming is carried out. In the compression test, the bead foamed molded article exhibits relatively cracks between beads and beads, And so on. On the other hand, the resin foam according to one example of the present invention can be produced by an extrusion foaming method, thereby achieving remarkably excellent compression strength. As a result, when the heat resistant material is used as a packaging container for food packaging, it can be easily maintained in shape under external pressure.
The mass per unit area of the heat resistant material may range from 100 to 1000 g / m 2 . For example, the mass per unit area of the heat resistant material may be 100 to 900 g / m 2 , 100 to 700 g / m 2, or 150 to 500 g / m 2 . By satisfying the mass per unit area in the above range, it can be confirmed that the heat resistant material according to the present invention is lightweight.
The heat resistant material can satisfy the following expression (2).
&Quot; (2) "
| V 1 -V 0 | / V 0 x 100? 10%
In Equation (2)
V 0 is the volume of the heat-resistant material (mm 3 ) before being exposed for 5 minutes under an output condition of 1000 W in the microwave oven,
V 1 is the volume (mm 3 ) of the heat-resistant material after exposure for 5 minutes at an output of 1000 W in a microwave oven.
Specifically, the dimensional change rate of the manufactured heat resistant material samples before and after exposure for 5 minutes in an output condition of 1000 W in a microwave oven was measured. This is a measurement value corresponding to the long-term dimensional change rate of the packaging container manufactured using the heat resistant material. For example, the volume may mean a value calculated by multiplying the length of each heat-resistant member, the width, and the length of each thickness. For example, the dimensional change ratio of the formula (2) may be in the range of 0.01 to 10%, 0.01 to 8%, or 0.01 to 5%. By satisfying the formula (2) in the above range, it can be seen that the heat resistant material according to the present invention does not change in melting or shape when used in a microwave oven. As a result, it can be seen that the heat resistant material according to the present invention is excellent in heat resistance.
When the above formula (2) is more than 10%, it may mean that the heat-resistant material may easily peel off, parts, warpage, discoloration or deformation easily.
As one example, the structure of the heat resistant material according to the present invention is a polyester resin foam having a density (KS M ISO 845) of 20 to 100 kg / m 3 ; And
And a polyester resin foam having a density of 110 to 230 kg / m < 3 >.
Specifically, the heat-resistant material may be a composite of a polyester resin foam having a relatively low density and a polyester resin foam having a relatively high density.
At this time, in the polyester resin foam having a relatively low density, 90% or more of the cells may be closed cells (DIN ISO4590). This means that the measured value of the polyester resin foam in accordance with DIN ISO 4590 is that at least 90% (v / v) of the cells are closed cells. For example, the percentage of closed cells in the polyester resin foam may be on the average 90 to 100% or 95 to 99%. By controlling the ratio of the closed cell to the above range, it is possible to increase the heat insulating property and the like. Accordingly, the heat resistant material can be widely used in a construction industry for insulation of a part of a building, for example, a foundation, a wall, a floor and / or a roof. For example, the polyester resin foam may comprise 1 to 15 cells, 3 to 15 cells, or 3 to 10 cells per mm 2 .
In addition, the average size of the cells may range from 300 to 800 탆. For example, the average size of the cells may range from 300 to 700 mu m, from 300 to 600 mu m, or from 350 to 500 mu m. At this time, the deviation of the cell size may be in a range of, for example, 5% or less, 0.1 to 5%, 0.1 to 4% to 0.1 to 3%. Thus, it can be seen that the polyester resin foam according to the present invention uniformly foamed cells of uniform size.
In addition, polyester resin foams having a relatively high density may have similar closed cell ratios and cell size deviations to polyester resin foams having a relatively low density. However, the number of cells per unit area of the polyester resin foam having a relatively high density may be larger, and may include, for example, 15 to 30 cells, 15 to 28 cells, or 20 to 30 cells per 1 mm 2 .
In addition, the average cell size of the polyester resin foam having a relatively high density may be smaller, and may range, for example, from 100 to 300 mu m. For example, the average size of the cells may range from 100 to 300 mu m, from 100 to 280 mu m, or from 100 to 250 mu m.
Such a heat-resistant material can be used as a packaging container for packing food or the like. In this case, when the polyester resin foam having a relatively high density of the packaging container is designed to face to the outside, excellent strength of the packaging container can be expected Excellent thermal insulation can be realized due to the relatively low polyester resin foam formed inside the packaging container.
Under relative humidity conditions of temperature and 50% of the heat-resistant material is the oxygen transmission rate is 23 ℃, can be not more than 10 cc / m 2 / 24h. For example, the oxygen permeability of the heat resistant material may be 0.1 to 10 cc / m 2 / 24h, 0.1 to 5 cc / m 2 / 24h or 0.1 to 3 cc / m 2 / 24h. Since the heat resistant material according to the present invention has oxygen permeability within the above range, it can prevent the food from reacting with oxygen and decaying when used as a food packaging container, and can be easily stored in food.
In the interior material according to the present invention, the polyester resin foam may further include a functional additive. Thus, the desired functionality can be effectively imparted without decreasing the physical properties of the foam, and the process efficiency and degree of freedom can be increased.
The functional additive may include at least one of an insulating agent, a hydrophilizing agent, a waterproofing agent, a flame retardant, an antibacterial agent, a deodorant, and an ultraviolet screening agent.
The heat insulating material may include a carbonaceous component. For example, the adiabatic agent may include graphite, carbon black, graphene, and the like, and may be specifically graphite.
The flame retardant is not particularly limited and may include, for example, a bromine compound, a phosphorus compound, an antimony compound, a metal hydroxide, and the like. The bromine compound includes, for example, tetrabromobisphenol A and / or decabromodiphenyl ether. The phosphorus compound may include an aromatic phosphoric acid ester, an aromatic condensed phosphoric acid ester, a halogenated phosphoric acid ester, and / or the like, and the antimony compound may include antimony trioxide and antimony pentoxide. Examples of the metal element in the metal hydroxide include aluminum (Al), magnesium (Mg), calcium (Ca), nickel (Ni), cobalt (Co), tin (Sn), zinc (Zn) ), Iron (Fe), titanium (Ti), and boron (B). Among them, metal hydroxides of aluminum or magnesium can be used. The metal hydroxide may be composed of one kind of metal element or two or more kinds of metal elements. For example, the metal hydroxide may include at least one of aluminum hydroxide and magnesium hydroxide.
The VOC reducing agent may include Graf and / or Bactoster Alexin and the like. At this time, the toast alecine is a natural sterilizing material extracted from propolis.
The hydrophilic agent is not particularly limited, and examples thereof include anionic surfactants (for example, fatty acid salts, alkylsulfuric acid ester salts, alkylbenzenesulfonic acid salts, alkylnaphthalenesulfonic acid salts, alkylsulfosuccinic acid salts and polyoxyethylene alkylsulfuric acid ester salts) , Nonionic surfactants (for example, polyoxyalkylene alkyl ethers such as polyoxyethylene alkyl ethers, polyoxyethylene derivatives, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, (E.g., alkylamine salts, quaternary ammonium salts, alkylbetaines, amine oxides, etc.), and water-soluble polymers such as polyoxyethylene alkylamines and alkylalkanolamides), cationic and amphoteric surfactants Or a protective colloid (e.g., gelatin, methyl cellulose, hydroxyethyl cellulose, Polyoxyethylene-polyoxypropylene block copolymer, polyacrylamide, polyacrylic acid, polyacrylic acid salt, sodium alginate, and polyvinyl alcohol partial saponification), and the like. can do.
The kind of the waterproofing agent is not particularly limited and may be, for example, silicone, epoxy, cyanoacrylic acid, polyvinyl acrylate, ethylene vinyl acetate, acrylate, polychloroprene Polyester resin mixture series, mixture of polyol and polyurethane resin, mixture of acrylic polymer and polyurethane resin, polyimide series, and mixture of cyanoacrylate and urethane.
The kind of the antibacterial agent is, for example, a composite obtained by adding at least one metal selected from the group consisting of silver, zinc, copper and iron to at least one carrier selected from the group consisting of hydroxyapatite, alumina, silica, titania, zeolite, zirconium phosphate and aluminum polyphosphate . ≪ / RTI >
The deodorant may be a porous material. Since the porous material has a strong tendency to physically adsorb a fluid flowing around the porous material, it is possible to adsorb a volatile organic compound (VOC). The deodorant may be selected from, for example, silica, zeolite and calcium (Ca), sodium (Na), aluminum (Al), silver (Ag), copper (Cu), tin (Zn), iron (Fe), cobalt ) And nickel (Ni), or a mixture of two or more thereof.
The ultraviolet screening agent is not particularly limited and may be, for example, an organic or inorganic ultraviolet screening agent. Examples of the organic ultraviolet screening agent include p-aminobenzoic acid derivatives, benzylidene camphor derivatives, cinnamic acid derivatives, Benzotriazole derivatives, and mixtures thereof. Examples of the inorganic ultraviolet screening agent may include titanium dioxide, zinc oxide, manganese oxide, zirconium dioxide, cerium dioxide, or a mixture thereof.
The heat resistant material may include a coating layer formed on at least one surface of the foam.
As one example, the coating layer may include at least one of ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVdC), and polyethylene terephthalate (PET) as a gas barrier layer can do. By further forming a gas barrier layer on at least one side of the foam, under relative humidity conditions of temperature and 50% of the oxygen transmission rate 23 ℃, it is possible to provide a 10cc / m 2 / 24h or less heat-resistant materials. For example, the oxygen permeability of the heat resistant material may be 0.1 to 10 cc / m 2 / 24h, 0.1 to 5 cc / m 2 / 24h or 0.1 to 3 cc / m 2 / 24h. By implementing the oxygen permeability within the above range, when the heat resistant material is used as a food packaging container, it is possible to prevent the food from reacting with oxygen and decaying, thereby making it easy to store foods.
Specifically, the gas barrier layer can be formed using ethylene vinyl alcohol. In this case, the gas generated in the food inside the food container can be discharged out, and at the same time, the oxygen supply from the outside can be blocked.
As another example, the coating layer may be a conductive resin in which at least one of carbon, aluminum and iron oxide is dispersed as an antistatic layer; And at least one of fluorine resins. Thus, by further forming an antistatic layer on at least one side of the foam, the physical property of the heat resistant material can be improved and the antistatic effect can be excellent.
The present invention can provide a method for producing the heat resistant material.
The method for producing the polyester resin foam contained in the heat resistant agent is not specifically limited, but the resin foam can be produced by extrusion foaming a polyester resin. Specifically, there are types of foaming methods largely bead foaming or extrusion foaming. In general, the bead foaming is a method of heating a resin bead to form a primary foam, aging the resin bead for a suitable time, filling the resin bead in a plate-shaped or cylindrical mold, heating the same again, and fusing and forming the product by secondary foaming. On the other hand, the extrusion foaming can simplify the process steps by heating and melting the resin and continuously extruding and foaming the resin melt, and it is possible to mass-produce, and the cracks, Development and the like can be prevented, and more excellent bending strength and compressive strength can be realized.
As one example of the method for producing the heat resistant material according to the present invention,
The polyester resin foam is extruded through a double annular nozzle,
Among the double annular nozzles,
The difference in density of the foam extruded from the inner nozzle and the density of the foam extruded from the outer nozzle can be 10 kg / m 3 or more.
Specifically, in manufacturing the heat resistant material, the polyester resin can be extruded and foamed using a double annular nozzle. As a result, it is possible to manufacture a heat resistant material having a structure in which two polyester resin foams having a difference in density are combined in a single process, without producing and laminating two polyester resin foams having different density. At this time, the difference in density of the polyester resin foam having the density difference may be in the range of 10 to 100 kg / m 3 , 10 to 80 kg / m 3, or 20 to 50 kg / m 3 . A heat resistant material having a composite polyester resin foam having a difference in density within the above range can be manufactured in a single process using a double annular nozzle, thereby reducing the processing cost.
The blowing agent supplied in the process of extruding the foam in the double annular nozzle is at least one of a thermally decomposable foaming agent and a volatile foaming agent,
The blowing agent used in extrusion from the inner nozzle and the blowing agent used in extrusion from the outer nozzle may not be the same.
The pyrolytic foaming agent may include, for example, an inorganic foaming agent containing sodium bicarbonate, an azo compound, a nitroso compound, a hydrazine compound, and the like. The volatile foaming agent may include, for example, carbon dioxide gas, an inert gas such as nitrogen, organic foaming agents such as propane, butane, pentane, hexane, methane and the like. At this time, by using at least one of the thermally decomposing foaming agent and the volatile foaming agent, the density of the foam can be controlled by controlling the expansion ratio of the polyester resin foam.
Specifically, the blowing agent used for extrusion from the inner nozzle and the blowing agent used for extrusion from the outer nozzle may be used differently, and the density of the foam foamed in each nozzle may be differently produced.
For example, in the double annular nozzle,
The blowing agent supplied at the time of extrusion from the inner nozzle uses carbon dioxide gas,
As the blowing agent supplied at the extrusion from the outer nozzle, a mixed gas of carbon dioxide gas and cyclopentane can be used.
Specifically, when the carbon dioxide gas having a high diffusion speed is extruded from the inner nozzle, the polyester resin foam extruded and foamed through the inner nozzle may have a low density.
Further, by using a mixed gas obtained by mixing a cyclopentane having a low diffusion speed and a carbon dioxide gas having a high diffusion speed at the time of extruding from an outer nozzle using as a foaming agent, a polyester having a high density as compared with a polyester resin foam produced from an inner nozzle Resin foams can be produced.
At this time, the composite foaming agent of carbon dioxide gas and cyclopentane,
The carbon dioxide gas and the cyclopentane can be mixed at a flow rate ratio of 1: 0.1 to 1:10.
For example, the mixed flow rate ratio of carbon dioxide gas and cyclopentane is 1: 0.1 to 1: 0.5, 1: 0.5 to 1: 1, 1: 0.8 to 1: 3, 1: 3 to 1: 1:10 range. By satisfying the above range, it is possible to control the density of the foam in a range having a uniform cell size.
The present invention can provide a packaging container containing the heat resistant material. Specifically, the packaging container may be used for food packaging. The heat resistant material according to the present invention is an eco-friendly material, does not emit environmental hormone, hardly changes its shape even at a high temperature, and can have excellent heat resistance. In addition, since the foams located inside and outside the container are manufactured with different densities, excellent strength and heat insulation can be realized at the same time. Further, the packaging container may be light in weight by using a foam produced by extrusion foaming a polyester resin.
Specifically, the heat resistant material can be used as a container for disposable cups.
Hereinafter, the present invention will be described in detail by way of Examples and the like according to the present invention, but the scope of the present invention is not limited thereto.
Example One
100 parts by weight of the PET resin was dried at 130 DEG C to remove moisture. In the first extruder, 1 part by weight of the PET resin from which moisture was removed, 1 part by weight of PMDA (pyromellitic dianhydride), 1 part by weight of talc, ) Were mixed and heated at 280 占 폚 to prepare a resin melt. Then, carbonic acid gas was mixed as a blowing agent in the first extruder, and the resin melt was sent to the second extruder and cooled to 220 캜. The cooled resin melt was extruded and foamed through a die to form a resin foam.
Then, the above-mentioned resin foam was fixed with a calibrator, and a certain shape was maintained to manufacture the heat resistant material according to the present invention.
Example 2
100 parts by weight of the PET resin was dried at 130 DEG C to remove moisture. In the first extruder, 1 part by weight of the PET resin from which moisture was removed, 1 part by weight of PMDA (pyromellitic dianhydride), 1 part by weight of talc, ) Were mixed and heated at 280 占 폚 to prepare a resin melt. Then, carbon dioxide gas as a blowing agent was mixed in the inside of the nozzle and mixed gas of carbon dioxide gas and cyclopentane mixed as a blowing agent in a ratio of 1: 1 was mixed on the outside of the nozzle, And cooled to 220 ° C. The cooled resin melt was extruded and foamed while passing through a die to form a heat resistant material.
Comparative Example
100 parts by weight of polystyrene resin, 0.2 parts by weight of titanium oxide and 1 part by weight of talc were mixed and heated to 220 DEG C to prepare a resin melt. Carbon halide carbon (HCFC-22) and carbon dioxide gas were introduced as a foaming agent, The resin melt thus melted was sent to a second extruder and cooled to 120 ° C. The cooled resin melt was extruded and foamed while passing through a die to form a heat resistant material.
Experimental Example 1: Measurement of physical properties
Heat conductivity, density and flexural strength were measured using the heat resistant materials prepared in Examples 1 to 2 and Comparative Examples. The measurement method is described below, and the results are shown in Table 1 below.
1) Thermal conductivity measurement (heat insulation measurement)
The thermal conductivity was measured under KS L 9016 conditions.
2) Density measurement
The density was measured under KS M ISO 845 conditions.
3) Measurement of flexural strength
Flexural strength was measured under ASTM D 638 conditions.
(W / mK)
(N / cm 2 )
Referring to Table 1, it can be confirmed that the heat resistant material according to the present invention has excellent strength and low thermal conductivity. In comparison with this, in the case of the heat resistant material according to the comparative example, it was confirmed that the bending strength was remarkably low.
Also, it can be confirmed that the density is different in the case of Example 1 in which the foamed bodies having different densities are combined.
Experimental Example 2: Heat resistance measurement
The dimensional change rate measurement experiment was performed on the heat resistant materials in Examples 1 to 2 and Comparative Examples. Specifically, the rate of dimensional change before and after exposure for 5 minutes under an output condition of 1000 W in a microwave oven was calculated by the following equation (2). The results are shown in Table 2 and FIG.
&Quot; (2) "
| V 1 -V 0 | / V 0 x 100? 10%
In Equation (2)
V 0 is the volume of the heat-resistant material (mm 3 ) before being exposed for 5 minutes under an output condition of 1000 W in the microwave oven,
V 1 is the volume (mm 3 ) of the heat-resistant material after exposure for 5 minutes at an output of 1000 W in a microwave oven.
Referring to Table 2, it can be seen that the heat resistance material according to the present invention exhibits a dimensional change rate of 5% or less even when used in a high-output microwave oven. On the other hand, in the case of the heat resistant material according to the comparative example, it was confirmed that the dimensional change rate was remarkably high at 24% under the same conditions. As a result, it can be seen that, when the heat resistant material according to the comparative example is used for a microwave oven, it is carbonized to deform the shape.
1, in the case of the heat resistant material (PET) according to the present invention, no change in shape was visually observed, but in the case of the heat resistant material PS according to the comparative example, a part of the heat resistant material melted, .
Claims (11)
And a coating layer formed on at least one side of the extruded foam,
A compressive strength (KS M ISO 844) of 20 to 300 N / cm 2 , a thermal conductivity of 0.04 W / mK or less,
Food packaging container satisfying Equation (1)
[Equation 1]
X / Y &ge; 1.5
Wherein X represents the flexural strength (N / cm 2 ) of the polyester resin extruded foam according to KS M ISO 844 and Y represents the density (kg / m 3) of the polyester resin extruded foam according to KS M ISO 845 ).
Based on the standards of the Agency for Food, Drug, and Foodstuffs, packaging materials and their raw materials,
When the elution standard is measured, the total elution amount is 30 ppm or less, and antimony germanium, terephthalic acid, isophthalic acid, acetaldehyde substances are not detected,
Food packaging containers in which volatile substances are not detected when measuring residual standards.
A food packaging container having a mass per unit area of 100 to 1000 g / m 2 .
A polyester resin extruded foam having a density (KS M ISO 845) of 20 to 100 kg / m 3 ; And
And a polyester resin extruded foam having a density of 110 to 230 kg / m < 3 >.
Wherein the coating layer is a gas barrier layer,
Ethylene vinyl alcohol, polyvinylidene chloride, and polyethylene terephthalate.
The coating layer is an antistatic layer,
A conductive resin in which at least one of carbon, aluminum, and iron oxide is dispersed; And at least one of a fluororesin.
Wherein the food packaging container is a container for cups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150174214A KR101778629B1 (en) | 2015-12-08 | 2015-12-08 | Eco-friendly heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150174214A KR101778629B1 (en) | 2015-12-08 | 2015-12-08 | Eco-friendly heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20170067938A KR20170067938A (en) | 2017-06-19 |
| KR101778629B1 true KR101778629B1 (en) | 2017-09-15 |
Family
ID=59278953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150174214A KR101778629B1 (en) | 2015-12-08 | 2015-12-08 | Eco-friendly heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101778629B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102040237B1 (en) | 2018-06-28 | 2019-11-06 | 주식회사 휴비스 | A molded product having gas barrier layer, A packaging container comprising the same, and Method for preparing the molded product |
| CN110869426A (en) * | 2018-06-28 | 2020-03-06 | 株式会社Huvis | Food packaging container and preparation method thereof |
| KR20220098890A (en) | 2021-01-05 | 2022-07-12 | 주식회사 휴비스 | A foam sheet having gas barrier layer and food container using the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040004087A1 (en) * | 2000-11-16 | 2004-01-08 | Hisao Iwamoto | Foam delivering container and method for charging contents into the same |
-
2015
- 2015-12-08 KR KR1020150174214A patent/KR101778629B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040004087A1 (en) * | 2000-11-16 | 2004-01-08 | Hisao Iwamoto | Foam delivering container and method for charging contents into the same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102040237B1 (en) | 2018-06-28 | 2019-11-06 | 주식회사 휴비스 | A molded product having gas barrier layer, A packaging container comprising the same, and Method for preparing the molded product |
| CN110869426A (en) * | 2018-06-28 | 2020-03-06 | 株式会社Huvis | Food packaging container and preparation method thereof |
| KR20220098890A (en) | 2021-01-05 | 2022-07-12 | 주식회사 휴비스 | A foam sheet having gas barrier layer and food container using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170067938A (en) | 2017-06-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101887918B1 (en) | Food Container Improved Heat-blocking Ability | |
| KR101778629B1 (en) | Eco-friendly heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same | |
| JP7110422B2 (en) | Molded article containing gas barrier layer, packaging container containing the same, and method for producing molded article | |
| KR101759068B1 (en) | Interior furnishings of vehicle having excellent durability | |
| JP2021062622A (en) | Composite sheet for food container excellent in heat resistance and workability, and food container formed of the same | |
| KR101723815B1 (en) | Heat resisting material having gas barrier layer, manufacturing method of the same and packaging container comprising the same | |
| KR102160456B1 (en) | Excellent moldability foam sheet, preparation method thereof, and food container using the same | |
| KR101778625B1 (en) | Heat resisting material having excellent dimension stability, manufacturing method of the same and packaging container comprising the same | |
| KR101784884B1 (en) | Masterbatch composition, and preparation method of polyester resin foam using the same | |
| KR102235854B1 (en) | Foamed article containing functional coating layer and method of preparing the same | |
| KR101667999B1 (en) | Heat resisting material having excellent heat resistance and strength, manufacturing method of the same and packaging container comprising the same | |
| KR101887897B1 (en) | Heat resisting material having gas barrier property and packaging container comprising the same | |
| KR101842601B1 (en) | Heat resisting material having improved appearance, manufacturing method of the same and packaging container comprising the same | |
| KR101706907B1 (en) | Resin foamed article containing hollowness and method of preparing the same | |
| KR101876929B1 (en) | Formed resin assembly containing additive dispersed area | |
| KR101783837B1 (en) | Core-Shell Structured Foam With Easily Controlling Density | |
| KR101759062B1 (en) | Interior furnishings of vehicle having excellent light weight property | |
| KR101767975B1 (en) | Furniture Materials Including Thermoplastic Resin Foam | |
| KR101767984B1 (en) | Foamed article having excellent flameproof and adiabatic effect, and manufacturing method of the same | |
| KR101880904B1 (en) | In plan laminat containing functional additive dispersed area | |
| KR20170051771A (en) | Foam Article Comprising Multi-Functional Foam Layer And Method For Preparing The Same | |
| KR20170019852A (en) | Foamed article containing functional coating layer and method of preparing the same | |
| KR20200087295A (en) | Foam sheet having excellent cell expression uniformity, and preparation method thereof | |
| CN111867799B (en) | Double-sided heating type foam sheet molding device and molding method using same | |
| KR20170024178A (en) | Formed resin assembly containing additive dispersed area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AMND | Amendment | ||
| E601 | Decision to refuse application | ||
| AMND | Amendment | ||
| X701 | Decision to grant (after re-examination) | ||
| GRNT | Written decision to grant |