KR101802383B1 - Core-Shell Structured Foam - Google Patents
Core-Shell Structured Foam Download PDFInfo
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- KR101802383B1 KR101802383B1 KR1020150174216A KR20150174216A KR101802383B1 KR 101802383 B1 KR101802383 B1 KR 101802383B1 KR 1020150174216 A KR1020150174216 A KR 1020150174216A KR 20150174216 A KR20150174216 A KR 20150174216A KR 101802383 B1 KR101802383 B1 KR 101802383B1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/34—Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
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- 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
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Abstract
The present invention relates to a composite foam having a core-shell structure, wherein the composite foam is provided with a core-shell structure of a polyester resin foam, whereby properties such as flame retardancy, elasticity and density can be simultaneously improved.
Description
The present invention relates to a foam having a core-shell structure.
BACKGROUND ART [0002] In recent years, eco-friendly foamed molded articles have been actively developed and representative examples of the material include polyester foamed articles. The polyester is excellent in mechanical properties, and has excellent heat resistance and chemical resistance. However, it has difficulty in molding by extrusion foaming by melting as a crystalline resin. On the other hand, with the development of the technology, polyester can also be produced by the foaming process during melt extrusion. For example, U.S. Patent No. 5,099,991 discloses a method of producing an expanded molded article by extrusion foaming by adding a cross-linking agent to a polyester.
However, since the polyester foam has a low melt viscosity, it has a limitation in heightening the expansion ratio and it is difficult to increase the functionality by adding an additive.
Accordingly, there is a demand for development of an expanded molded article having various structures including the above-mentioned polyester and improved physical properties such as flame retardance, elasticity and strength.
It is an object of the present invention to provide a foam of a core-shell composite structure comprising a polyester resin.
According to an aspect of the present invention,
A core comprising a resin foam; And
A shell comprising an unfoamed resin,
Wherein the core and the shell have a repeated cross-sectional structure,
Wherein the resin foam is at least one foam of a polyester resin, a polystyrene resin and a polyethylene resin,
The unfoamed resin is a composite foam which is at least one of a polyester resin, a polystyrene resin and a polyethylene resin.
The composite foam according to the present invention can simultaneously improve physical properties such as flame retardance, elasticity and density by providing a water-foamed and non-foamed resin including a polyester resin in a core-shell structure.
1 shows a structure of an extruder including a double annular nozzle according to the present invention.
2 shows a structure of a double annular nozzle according to the present invention.
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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
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.
Therefore, the configurations shown in the embodiments described herein are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents And variations.
Hereinafter, the composite foam according to the present invention will be described in detail.
As one example, the composite foams according to the present invention may comprise,
A core comprising a resin foam; And
A shell comprising an unfoamed resin,
Wherein the core and the shell have a repeated cross-sectional structure,
Wherein the resin foam is at least one foam of a polyester resin, a polystyrene resin and a polyethylene resin,
The unfoamed resin may be at least one of a polyester resin, a polystyrene resin and a polyethylene resin.
A core comprising the resin foam; And the shell including the unfoamed resin may be formed by double annular nozzles so that the core and the shell may have a repeated cross-sectional structure. The core may have a cross-sectional shape such as a circle or an ellipse. In addition, the shell may have a cross-sectional shape such as a circle, a rectangle, a pentagon, a hexagon, or a polygon. The core may be formed by an inner nozzle of the double annular nozzle, and the shell may be formed by an outer nozzle of the double annular nozzle.
As one example, the resin foam may be a foam of a polyester resin, and the unfoamed resin may be a cured product of a polyester resin.
The polyester resin mainly used so far is a high molecular weight aromatic polyester resin produced by the condensation polymerization reaction of 1,4-butanediol with terephthalic acid. Here, the high molecular weight polyester may mean a polymer having an intrinsic viscosity [?] Of 0.8 (dL / g) or more. However, the aromatic polyester resin is excellent in physical properties such as high molecular weight, thermal stability and tensile strength, but it is not decomposed in a natural ecosystem after disposal, causing serious environmental pollution problem for a long time. On the other hand, it is already known that aliphatic polyester has biodegradability. However, conventional aliphatic polyesters have a low melting point due to the flexible structure of the main chain and low crystallinity, are low in thermal stability upon melting, are likely to be thermally decomposed, have a high melt flow index, There is a problem that the use thereof is limited due to poor physical properties such as tear strength. The aliphatic polyester may include, for example, polyglycolide, polycaprolactone, polylactide, and polybutylene succinate.
Generally, polystyrene is a non-crystalline polymer obtained by radical polymerization of styrene, and is a colorless transparent thermoplastic resin. The boiling point is about 145 ° C, which is also called a styrol resin. It is made of polystyrene which is a polymer of liquid styrene unit produced by the reaction of ethylene and benzene. It is not easily eroded by chemicals, easy to process, and has a high refractive index. In addition, it becomes a hard molded product (molded product) and has excellent characteristics as an electric insulating material.
Generally, various kinds of polyethylene are produced according to a polymerization method. For example, low-density polyethylene and high-density polyethylene are classified according to density. At present, the main products are low density polyethylene (soft polyethylene) and C type high density polyethylene (hard polyethylene) corresponding to A, and a lot of low density polyethylene is being produced. Low-density polyethylene is produced by heating at a high temperature of 200 atm or higher at 1,000 atm with a trace amount of air as a catalyst, and is therefore also referred to as high-pressure polyethylene. The low-density polyethylene has a density of about 0.91, and because of its branches, the molecular arrangement is insufficient and the crystallized portion is about 65% so that the low-density polyethylene elongates well and has a small tensile strength but a high impact resistance. Therefore, there are characteristics that are easy to process and easy to use. The high-density polyethylene is polymerized with ethylene at a temperature of about 70 ° C and 10 atm using a so-called chi-glazing catalyst (a complex catalyst consisting of titanium tetrachloride and triethylaluminum). It is generally called low-pressure polyethylene. It has a softening point, a high hardness and a high strength, but has a small elongation and impact resistance and a hard feel. It has few branches and a high crystallinity, reaching 85% and a density of over 0.95.
Specifically, the foam in the present invention may be a polyester resin. The polyester resin is not limited as long as it can maintain the physical properties of the polyester and is excellent in softness characteristics and foam forming workability. As one example, the polyester resin may have biodegradability.
Specific examples of the polyester include polyethylene terephthalate (PET), polystyrene (PS), polybutylene terephthalate (PBT), polylactic acid (PLA), poly Polyglycolic acid (PGA), polypropylene (PP), polyethylene (PE), polyethylene adipate (PEA), polyhydroxyalkanoate (PHA), polytrimethylene terephthalate And may be at least one selected from the group consisting of Polytrimethylene Terephthalate (PTT) and Polyethylene naphthalate (PEN). Specifically, polyethylene terephthalate (PET) may be used in the present invention.
According to the general formula 1, the composite foam according to the present invention may have a maximum heat release rate of 5 MJ / m or less for 5 minutes according to KS F ISO 5660-1. Specifically, the heat release rate may be 0.01 to 7.5 MJ / m 2 , 0.05 to 7 MJ / m 2 , 0.1 to 5 MJ / m 2, or 0.15 to 3 MJ / m 2 . Also, the composite foam according to the present invention may have a flame retardancy of more than grade 2 based on KS F 4724. If the flame-retardant grade of the composite foam is of the above grade, it may exhibit semi-fireproof performance. Accordingly, the composite foam according to the present invention can maintain a stable shape even at a high temperature by having a maximum heat release rate and a flame retardancy grade within the above range.
As one example, the unfoamed resin according to the present invention may include at least one of an adiabatic agent, a flame retardant, a VOC reducing agent, a hydrophilic agent, a waterproofing agent, an antibacterial agent, a deodorant, an electric shielding agent, an electric conduction agent and a UV blocking agent.
As an example, the composite foam according to the present invention may have a Shore D hardness of 50 or less according to ASTM D 2240. Specifically, the Shore D hardness may be 1 to 50, 3 to 45, 5 to 40, 10 to 35, or 15 to 30. When the hardness is lowered, elasticity and resilience are improved, which means that elasticity is improved in a broad sense. The composite foam according to the present invention has a Shore hardness in the above range, so that a high elastic force can be realized.
As an example, the composite foams according to the invention may have a density of 50 kg / m < 3 > or more according to KS M ISO 845. Specifically, the density may be in the range of 50 to 99 kg / m 3 , 55 to 95 kg / m 3 , 60 to 90 kg / m 3, or 65 to 85 kg / m 3 . When the density is in the above range, an improved compressive strength and flexural strength can be realized.
As an example, the compressive strength of the composite foam according to the present invention may range from 20 to 300 N / cm < 2 >. The compressive strength may be specifically from 25 to 200 N / cm 2 , from 30 to 100 or from 35 to 80 N / cm 2 . The composite foam according to the present invention has a high density, so that an improved compression strength can be realized.
As an example, the absorption capacity of the composite foam according to the present invention is 1 g / 100 cm < 2 > based on KS M IOS 7214 0.7 g / 100 cm < 2 > 0.6 g / 100 cm < 2 > 0.01 to 0.5 g / 100 cm 2 or 0.1 to 0.4 g / 100 cm 2 Lt; / RTI > When the absorption amount of the composite foam is in the above range, there is an advantage that it can be easily stored outside.
As an example, the composite foam according to the present invention may be a closed cell (DIN ISO4590) where at least 90% of the cells are closed cells. This may mean that the measured value of the composite foam according to DIN ISO 4590 is that at least 90% of the cells are closed cells. For example, the closed cell of the composite foam may be 90-100% or 95-100%. The composite foam according to the present invention has closed cells within the above range, so that excellent heat insulating properties can be realized. Thus, the composite foam can be widely used in the construction industry for insulation of a part of a building, for example, a foundation, a wall, a floor and a roof. For example, the number of cells of the complex multiplier may comprise 1 to 30 cells, 3 to 25 cells, or 3 to 20 cells per mm.
As one example, the composite foam may be an extrusion foam molding.
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, the composite foam according to the present invention may have a hydrophilization function, a waterproof function, a flame retarding function or a UV blocking function and may be used as a surfactant, a UV blocking agent, a hydrophilic agent, a flame retardant, a heat stabilizer, The composition may further comprise at least one functional additive selected from the group consisting of an antioxidant, an infrared attenuating agent, a plasticizer, a fire retardant chemical, a pigment, an elastic polymer, an extrusion aid, an antioxidant, a filler, an antistatic agent and a UV absorber. Specifically, the composite foam of the present invention may comprise a chain extending additive, a filler, a heat stabilizer, and a blowing agent.
Although the chain extending additive is not particularly limited, for example, pyromellitic dianhydride (PMDA) may be used in the present invention.
Examples of the filler include talc, mica, silica, diatomaceous earth, alumina, titanium oxide, zinc oxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, calcium hydroxide, potassium carbonate, calcium carbonate, magnesium carbonate, Inorganic compounds such as sodium hydrogencarbonate and glass beads, organic compounds such as polytetrafluoroethylene and azodicarbonamide, mixtures of sodium hydrogencarbonate and citric acid, and inert gases such as nitrogen. These fillers can serve to impart functionalities and reduce the cost of the composite foam. Specifically, Talc may be used in the present invention.
The heat stabilizer may be an organic or inorganic compound. The organic or inorganic phosphorus compound may be, for example, phosphoric acid and organic esters thereof, phosphorous acid and organic esters thereof. For example, the heat stabilizer may be a commercially available material, such as phosphoric acid, alkyl phosphate or aryl phosphate. Specifically, in the present invention, the heat stabilizer may be triphenyl phosphate, but it is not limited thereto. The thermostabilizer may be used within a conventional range without limitation as long as it can improve the thermal stability of the composite foam.
Examples of the blowing agent include a physical blowing agent such as N 2 , CO 2 and Freon and a physical blowing agent such as butane, pentane, neopentane, hexane, isohexane, heptane, isoheptane, methyl chloride, etc. or azodicarbonamide , P, P'-oxybis (benzene sulfonyl hydrazide) [P, P'-oxy bis (benzene sulfonyl hydrazide)] compounds, N, N'- dinitrosopentamethylenetetramine -dinitroso pentamethylene tetramine) compound. Specifically, CO 2 can be used in the present invention.
The flame retardant in the present invention is not particularly limited and may include, for example, a bromine compound, phosphorus or phosphorus compound, antimony compound, metal hydroxide and the like. The bromine compound includes, for example, tetrabromobisphenol A and decabromodiphenyl ether, and the phosphorus or phosphorus compound includes an aromatic phosphoric acid ester, an aromatic condensed phosphoric acid ester, a halogenated phosphoric acid ester, and the like, and the antimony compound Antimony trioxide, antimony pentoxide, and the like. 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), boron (B), and the like. Of these, aluminum and magnesium are preferable. The metal hydroxide may be composed of one kind of metal element or two or more kinds of metal elements. For example, metal hydroxides composed of one kind of metal element may include aluminum hydroxide, magnesium hydroxide, and the like.
The surfactant is not particularly limited, and examples thereof include anionic surfactants (e.g., 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 protective colloids (e.g., gelatin, methylcellulose, hydroxyethylcellulose, Polyoxyethylene-polyoxypropylene block copolymer, polyacrylamide, polyacrylic acid, polyacrylic acid salt, sodium alginate, polyvinyl alcohol partial saponification, etc.), and the like have.
The waterproofing agent is not particularly limited and includes, for example, silicone, epoxy, cyanoacrylate, polyvinyl acrylate, ethylene vinyl acetate, acrylate, polychloroprene, polyurethane and polyester resins , A mixture of polyol and polyurethane resin, a mixture of acrylic polymer and polyurethane resin, a polyimide, and a mixture of cyanoacrylate and urethane.
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, and mixtures thereof.
Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. However, the scope of the present invention is not limited by the following description.
Example
In order to manufacture the composite structure foam according to the present invention, a double ring type nozzle was used. Since the molding conditions and the temperature of the two materials were different, the extruder was separately used to select the optimum conditions.
The PET resin and the flame retardant, from which water was removed, were heated in a first extruder at 280 ° C to prepare a resin melt, and then injected into the outside of the double ring type nozzle.
100 phr of water-removed PET resin, 1 phr of PMDA, 1 phr of talc, and 0.1 phr of Irganox (IRG 1010) were added to the second extruder and heated to 280 DEG C to prepare a resin melt. Subsequently, carbonic acid gas was added as a blowing agent to the resin melt, mixed thoroughly, and then sent to a second extruder and cooled to 220 ° C. The cooled resin melt was injected into a double annular nozzle while passing through a die to prepare a composite foam having a core (resin) -shell (foam) structure. The structures of the double annular nozzle and extruder used are shown in FIGS. 1 and 2. Fig. 1 shows a structure of an extruder in which a plurality of double
Comparative Example
100 parts by weight of PET resin was dried at 130 캜 to remove moisture. In the first extruder, 1 part by weight of PET resin in which moisture was removed, 1 part by weight of pyromellitic dianhydride (PMDA), 1 part by weight of talc, 1 part by weight of Irganox (IRG 1010) , And the mixture was heated to 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.
Experimental Example
The heat release rate, compressive strength and density were measured using the composite foam prepared in the above Examples and Comparative Examples. The measurement method is described below, and the results are shown in Table 1 below.
1) Measurement of heat release rate
The maximum heat release rate (MJ / m) for 5 minutes after initiation of heating under the conditions of KS F ISO 5660-1 was measured.
2) Compressive strength measurement
The compressive strength was measured under KS M ISO 844 conditions.
3) Density measurement
The density was measured under KS M ISO 845 conditions.
In Table 1, the heat release rate results show that the maximum heat release rate for 5 minutes after heating was 3 MJ / m 2, which is superior to the comparative example.
As a result of the compressive strength, it was found that the performance of the embodiment is 175 N / cm 2 , which is twice as high as that of the conventional comparative example.
100: double annular nozzle
10: medial
20: outside
Claims (3)
A shell comprising a cured product of a polyester resin,
Wherein a core shell unit structure having a structure in which a periphery of a core including the polyester resin foam surrounds a shell containing a cured product of a polyester resin has a repeated cross-
A composite extrusion foam compressive strength 25 to 200 N / cm 2.
The cured product of the polyester resin includes at least one of an adiabatic agent, a flame retardant, a VOC reducing agent, a hydrophilic agent, a waterproofing agent, an antibacterial agent, a deodorant, an electric shielding agent, an electric conduction agent and a UV blocking agent.
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| KR1020150174216A KR101802383B1 (en) | 2015-12-08 | 2015-12-08 | Core-Shell Structured Foam |
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| KR102175968B1 (en) * | 2018-12-12 | 2020-11-09 | 주식회사 휴비스 | Foam having low melting point resin and a molded product including the same |
| KR102378550B1 (en) * | 2020-12-24 | 2022-03-25 | 주식회사 베스트환경기술 | biodegradable foamed buoy |
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| KR100799282B1 (en) * | 2007-02-28 | 2008-01-30 | 문영준 | Manufacturing method of non flammable expanded polystyrene block molding product and shape molding product |
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| KR100799282B1 (en) * | 2007-02-28 | 2008-01-30 | 문영준 | Manufacturing method of non flammable expanded polystyrene block molding product and shape molding product |
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