KR101571716B1 - A manufacturing method of polyolefin sheet using butane gas with supercritical co_2 gas - Google Patents

A manufacturing method of polyolefin sheet using butane gas with supercritical co_2 gas Download PDF

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KR101571716B1
KR101571716B1 KR1020150027181A KR20150027181A KR101571716B1 KR 101571716 B1 KR101571716 B1 KR 101571716B1 KR 1020150027181 A KR1020150027181 A KR 1020150027181A KR 20150027181 A KR20150027181 A KR 20150027181A KR 101571716 B1 KR101571716 B1 KR 101571716B1
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gas
polyolefin
carbon dioxide
supercritical state
based sheet
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KR1020150027181A
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Korean (ko)
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백양수
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(주)한우포옴
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122Hydrogen, oxygen, CO2, nitrogen or noble gases
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141Hydrocarbons
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2201/00Foams characterised by the foaming process
    • C08J2201/02Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/034Post-expanding of foam beads or sheets

Abstract

The present invention relates to a method for manufacturing a polyolefin-based sheet by using butane gas and carbon dioxide gas in a supercritical state. The purpose of the present invention is to provide a method for manufacturing a polyolefin-based sheet by using butane gas and carbon dioxide gas in a supercritical state, wherein the size of a foamed cell is small and stable physical properties of the polyolefin-based sheet can be maintained by injecting inert gas in a supercritical state which has high stability and low affinity, diffusible properties, and solubility with respect to a polyolefin-based resin. When the present invention is applied, the polyolefin-based sheet manufactured by using butane gas and carbon dioxide gas in a supercritical state has a small cell size and high compression strength when compared to a sheet of a comparative example which is foamed by using butane gas only. Therefore, the cell of the polyolefin-based sheet can be formed to be stronger than an existing cell, and the cell is prevented from being broken during forming.

Description

부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법{A manufacturing method of polyolefin sheet using butane gas with supercritical CO₂gas}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyolefin-based sheet using a butane gas and a carbon dioxide gas in a supercritical state,

본 발명은 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법에 관한 것으로, 보다 상세하게 폴리 올레핀계 레진에 대해 안전성이 높고, 친화성이나 확산성이나 용해성이 떨어지는 비활성 가스를 초임계 상태로 주입함으로써 발포 셀의 크기가 작고 안정적인 물성을 유지할 수 있도록 한 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법에 관한 것이다.The present invention relates to a method for producing a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state. More specifically, the present invention relates to a method for producing a polyolefin-based sheet by using an inert gas having high affinity, The present invention relates to a method for producing a polyolefin-based sheet using a butane gas and a carbon dioxide gas in a supercritical state so that the size of the foamed cell is small and stable physical properties can be maintained by injecting into a supercritical state.

주지된 바와 같이, 폴리올레핀계 수지의 예비 발포체 및 그의 제조 방법에 관해서는 많은 연구가 선행되어 왔으며, 예를들어 일본 특허 공보 소60-49040호 에서는 사용수지의 용융점 이하 -25℃ 내지 -5℃ 영역의 발포온도에서 발포가 가능하고 그 이하의 온도범위에서는 성형성 있는 발포체의 제조가 불가능하며 이는 차등열분석법(differential scanning calorimeter; 이하 DSC 로 약칭함)에 의한 측정 도표상의 고온측 피크 형성 여부와 관계가 있다고 기술함으로써 DSC 상에 두개의 피크가 형성되는 것의 중요성을 강조하고 있다.As is well known, a lot of research has been carried out on the prefoamed polyolefin resin and its production method. For example, in Japanese Patent Publication No. 60-49040, in the range of -25 ° C to -5 ° C The foam can be foamed at a foaming temperature of the foam, and it is impossible to produce a foam with a moldability at a temperature lower than the foaming temperature. This is because the presence of a high temperature side peak on a measurement chart by a differential scanning calorimeter (hereinafter abbreviated as DSC) The importance of the formation of two peaks on the DSC is emphasized.

그러나, 최근 심각하게 대두된 환경문제로 인하여 종래 사용되어 왔던 프레온 발포제의 사용은 금지되었고 따라서, 비록 효율면에서는 뒤떨어지지만 이의 대체 발포제로서 탄화수소류, 무기계 발포제 등을 사용해야만 하게 되었다.However, the use of the freon blowing agent, which has been conventionally used due to the recent serious environmental problems, has been banned, and therefore, it has become necessary to use hydrocarbons, inorganic foaming agents and the like as alternative foaming agents, though they are inferior in efficiency.

하지만, 이러한 대체 발포제를 사용하게 되면서 프레온 기체를 발포제로 사용하는 선행의 기술에 비해 예비 발포체의 팽창력 저하(발포배율 저하), 셀 안정화를 위한 냉각능력 저하 현상 등이 문제점으로 인식되어 왔으며, 실제로 프레온 발포제를 사용하였을 때보다 발포 셀의 크기가 크고 불규칙하며 일부 물성의 저하 현상이 발생하는 것으로 보고되고 있다.However, the use of such an alternative foaming agent has been recognized as a problem in that the expansion force (lowering of the expansion ratio) of the preliminary foamed body (lowering of the expansion ratio) and the cooling ability deterioration for cell stabilization are compared with the prior art in which the Freon gas is used as the foaming agent. It has been reported that the size of the foamed cell is larger and irregular than that of the foamed material, and some physical properties are lowered.

따라서, 프레온의 대체 발포제를 사용하면서도 압축강도 및 완충능력 등의 일반적인 물성 및 발포배율에 있어서 프레온 발포제를 사용하여 제조한 제품과 비슷하거나 더욱 우수한 제품 특성을 나타내는 발포체의 제조 방법에 대한 개발의 필요성이 요구되는 실정이다.Therefore, there is a need to develop a method for producing a foam which exhibits similar or superior product properties to products prepared using a Freon foaming agent in general physical properties such as compressive strength and buffering capacity, and foaming ratio, while using an alternative foaming agent of Freon This is a required situation.

본 발명은 상기한 종래 기술의 사정을 감안하여 이루어진 것으로, 폴리 올레핀계 레진에 대해 안전성이 높고, 친화성이나 확산성이나 용해성이 떨어지는 비활성 가스를 초임계 상태로 주입함으로써 발포 셀의 크기가 작고 안정적인 물성을 유지할 수 있도록 한 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법을 제공함에 그 목적이 있다. SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances of the prior art described above, and it is an object of the present invention to provide a polyolefin-based resin which has a high safety and has an affinity, The present invention provides a method for producing a polyolefin-based sheet using a butane gas and a carbon dioxide gas in a supercritical state so as to maintain physical properties.

상기한 목적을 달성하기 위해, 본 발명의 바람직한 실시예에 따르면 탄뎀 압출기(tandem extruder)(2)의 제 1압출부(4)에 폴리올레핀 레진(polyolefin resin): 97-80 중량부를 투입하고, 폴리올레핀 레진(polyolefin resin)이 제 1, 2 가스와 혼합되어 T-다이까지 이송될 수 있도록 150℃ 온도를 유지하고, 120㎏/㎠에서 500kg/cm²의 압력을 가하고, 제 1압출부(4)에 형성된 제 1가스 주입부(8)를 통해 1.5 내지 9 중량부의 부탄가스를 주입하고, 제 1압출부(4)와 연결된 제 2압출부(10)에 형성된 제 2가스 주입부(12)를 통해 초임계 상태의 1.5 내지 9 중량부의 초임계 상태의 이산화탄소를 주입하여 발포하는 것을 특징으로 하는 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법이 제공된다.According to a preferred embodiment of the present invention, 97-80 parts by weight of a polyolefin resin is put into the first extruded portion 4 of a tandem extruder 2, The polyolefin resin was mixed with the first and second gases and maintained at a temperature of 150 ° C so as to be conveyed to the T-die. A pressure of 500 kg / cm 2 was applied at 120 kg / Butane gas is injected through the formed first gas injecting section 8 and the second gas injecting section 12 formed in the second extruding section 10 connected to the first extruding section 4 And a carbon dioxide gas in a supercritical state in a supercritical state of 1.5 to 9 parts by weight is injected and foamed. The method for producing a polyolefin-based sheet using carbon dioxide gas in butane gas and supercritical state is provided.

바람직하게, 상기 초임계 상태의 이산화탄소는 공급 온도가 30℃-60℃이고, 공급 압력이 7.38-50Mpa인 것을 특징으로 하는 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법이 제공된다. Preferably, the carbon dioxide in the supercritical state has a feed temperature of 30 ° C. to 60 ° C. and a feed pressure of 7.38 to 50 MPa. The process for producing a polyolefin-based sheet using the carbon dioxide gas of butane gas and supercritical carbon dioxide / RTI >

본 발명에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법은 부탄가스만을 사용하여 발포된 비교예에 비해, 셀의 크기가 작고 압축강도가 크므로 종래의 셀보다 강하게 제조 가능하고, 성형시 셀이 깨지는 현상을 방지할 수 있게 된다.Compared with the comparative example in which the butane gas and the carbon dioxide gas of the supercritical state are used, the polyolefin-based sheet is produced more strongly than the comparative example in which only the butane gas is foamed, since the cell size is small and the compressive strength is large. And it is possible to prevent the cell from being broken during molding.

도 1은 본 발명의 일실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조장치를 도시한 도면,
도 2는 본 발명의 일실시예에 따른 초임계 상태의 이산화탄소 가스 공급장치를 도시한 도면,
도 3은 본 발명의 일실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 압력과 온도 변화도를 도시한 그래프이다.
1 is a view showing an apparatus for producing a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state according to an embodiment of the present invention,
FIG. 2 illustrates a supercritical carbon dioxide gas supply apparatus according to an embodiment of the present invention. FIG.
3 is a graph showing pressure and temperature changes of a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state according to an embodiment of the present invention.

이하, 본 발명에 대해 도면을 참조하여 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.

도 1은 본 발명의 일실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조장치를 도시한 도면, 도 2는 본 발명의 일실시예에 따른 초임계 상태의 이산화탄소 가스 공급장치를 도시한 도면, 도 3은 본 발명의 일실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 압력과 온도 변화도를 도시한 그래프이다.FIG. 1 is a view showing an apparatus for producing a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state according to an embodiment of the present invention. FIG. 2 is a cross- FIG. 3 is a graph showing pressure and temperature changes of a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state according to an embodiment of the present invention. FIG.

이를 참조하면, 본 발명의 일실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법은 폴리 올레핀계 레진에 대해 안전성이 높고, 친화성이나 확산성이나 용해성이 떨어지는 비활성 가스를 초임계 상태로 주입함으로써 발포 셀의 크기가 작고 안정적인 물성을 유지할 수 있도록 한 방법이다. The method of producing a polyolefin-based sheet using a butane gas and a carbon dioxide gas in a supercritical state according to an embodiment of the present invention is characterized in that the polyolefin-based resin is highly safe and has low affinity, By injecting the inert gas into the supercritical state, the size of the foam cell is small and stable physical properties can be maintained.

본 발명의 일실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법은 도 1에 도시된 탄뎀 압출기(tandem extruder)(2)를 통해 구성되는 바, 복수의 압출부가 구성되며 이송부와 가스 주입부가 구성되어져 있다.The method for producing a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state according to an embodiment of the present invention comprises a tandem extruder 2 shown in FIG. 1, And a feed section and a gas injection section are constituted.

보다 상세하게, 기본적인 상기 탄뎀 압출기(tandem extruder)(2)는 제 1압출부(4)와 제 1이송부(6) 및 제 2압출부(10)와 제 2이송부(14)가 2중 구조로 연결되어져 있으며, 제 2이송부(14)의 단부에는 T-다이(16)가 구성되어져 있다.More specifically, the basic tandem extruder 2 has a structure in which the first extrusion portion 4, the first transfer portion 6, the second extrusion portion 10, and the second transfer portion 14 have a double structure And a T-die 16 is formed at an end of the second transfer unit 14. [

이때, 본 발명의 제조방법을 시현하기 위해서, 상기 제 1 이송부(6) 및 제 2이송부(14)에 각각 가스를 주입하기 위한 제 1, 2 가스 주입부(8,12)가 구성된 바, 상기 제1 가스 주입부(8)에는 초임계 이산화탄소 가스를 공급하며 butane 가스는 제 2 가스 주입부(12)를 통해 공급한다.In order to realize the manufacturing method of the present invention, the first and second gas injection units 8 and 12 for injecting gas into the first transfer unit 6 and the second transfer unit 14, respectively, The supercritical carbon dioxide gas is supplied to the first gas injection unit 8 and the butane gas is supplied through the second gas injection unit 12.

이산화탄소 가스는 butane 가스에 비해 임계온도가 낮고 안전성이 있는 반면에 화학적인 친화력이 낮고 용해성이 덜하나 본 발명에서 풀고자하는 과제는 butane 가스가 발포성에서는 이산화탄소 가스 보다 우월성을 가지나 위험성 때문에 이산화탄소 가스와 혼용해서 사용하며 이산화탄소 가스가 화학적인 친화력이나 용해성이 덜하므로 tandem 압출기의 제 1 가스주입부(8)에 투입시키며 상대적으로 용해성이나 친화력이 좋은 butane은 제 2 가스주입부(12)에 투입시킨다.Although the carbon dioxide gas has a lower critical temperature and safety than the butane gas, it has a lower chemical affinity and less solubility. However, the problem to be solved in the present invention is that the butane gas has superiority to the carbon dioxide gas in foaming, And the carbon dioxide gas has less chemical affinity or solubility. Therefore, the carbon dioxide gas is introduced into the first gas injection unit 8 of the tandem extruder, and the butane having relatively good solubility and affinity is injected into the second gas injection unit 12.

투입량은 발포의 배율, 압출량, 용융 온도 및 압력의 변화에 따라 다르나 본 발명에서 제시하는 구성비는 안정성 측면을 고려하여 아래와 같이 구성하며 1-5배의 발포 sheet를 얻는다.Although the amount of the injection varies depending on the expansion ratio of the foaming, the extrusion amount, the melting temperature and the pressure, the constitutional ratio proposed in the present invention is as follows in view of stability, and 1-5 folds of foam sheet is obtained.

한편, 상기 제 1가스 주입부(8)에는 초임계 이산화탄소 공급장치(18)가 연결되어 구성되는 바, 초임계 이산화탄소 공급장치(18)는 이산화탄소를 저장하는 이산화탄소 탱크(20)와, 그 이산화탄소 탱크(20)와 직결되어 이송라인의 유량을 측정하는 유량계(22)와, 유량계(22)의 후단에 구성되어 이송되는 이산화탄소를 냉각시키는 냉각장치(24)와, 상기 냉각장치(24)의 후단에 구성되어 이송되는 이산화탄소에 이송압력을 가하는 펌프(26)와, 상기 펌프(26)의 후단에 장착되어 댐핑 기능을 수행하는 댐퍼(28)와, 댐퍼(28) 후단의 이송라인에 고압을 걸어서 압출기의 제 1가스 주입부(8)로 이산화탄소를 공급하기 위한 고압라인(30)으로 이루어진다.The supercritical carbon dioxide supply unit 18 is connected to the first gas injection unit 8 and includes a carbon dioxide tank 20 for storing carbon dioxide, A flow meter 22 for directly measuring the flow rate of the transfer line directly connected to the flow meter 20 and a cooling device 24 for cooling the carbon dioxide transferred at the downstream end of the flow meter 22, A damper 28 mounted on the rear end of the pump 26 for performing a damping function and a damper 28 for applying a high pressure to the transfer line at the downstream end of the damper 28, And a high-pressure line 30 for supplying carbon dioxide to the first gas injection unit 8 of the first gas injection unit 8.

발명의 일실시예에 따른 부탄가스 및 초임계 상태의 보조가스를 이용한 폴리 올레핀계 시트의 제조에 사용되는 원재료는 아래와 같다. The raw materials used for producing the polyolefin-based sheet using the butane gas and the supercritical auxiliary gas according to an embodiment of the present invention are as follows.

폴리올레핀 레진(polyolefin resin): 97-80 중량부,97 to 80 parts by weight of a polyolefin resin,

투입 가스량: 3-18 중량부,3 to 18 parts by weight of feed gas,

기타: 0-2 중량부.Others: 0-2 parts by weight.

[실시예][Example]

탄뎀 압출기(tandem extruder)(2)의 제 1압출부(4)에 폴리올레핀 레진(polyolefin resin): 97-80 중량부를 투입하고, 폴리올레핀 레진(polyolefin resin)이 제 1, 2 가스와 잘 혼합되어 T-다이까지 이송될 수 있도록 150℃ 온도를 유지하고, 120㎏/㎠에서 500㎏/㎠ 의 압력을 가한다.97-80 parts by weight of a polyolefin resin is put into the first extruding part 4 of a tandem extruder 2 and polyolefin resin is mixed well with the first and second gases to form T - The temperature is maintained at 150 ° C so that it can be transferred to the die, and a pressure of 500 kg / cm 2 is applied at 120 kg / cm 2.

그 상태에서, 제 1가스 주입부(8)를 통해 1.5 내지 9 중량부의 초임계 상태 이산화탄소를 주입하고, 제 2가스 주입부(12)를 통해 초임계 상태의 1.5 내지 9 중량부의 부탄가스를 주입하는 바, 공급하는 초임계 이산화탄소의 조건은 아래와 같다.In this state, 1.5 to 9 parts by weight of supercritical carbon dioxide is injected through the first gas injecting part 8 and 1.5 to 9 parts by weight of butane gas of a supercritical state is injected through the second gas injecting part 12 The conditions of supplying supercritical carbon dioxide are as follows.

이산화탄소의 공급 온도: 30℃-60℃Supply temperature of carbon dioxide: 30 ℃ -60 ℃

이산화탄소의 공급 압력: 7.38-50MpaSupply pressure of carbon dioxide: 7.38-50Mpa

[비교예][Comparative Example]

탄뎀 압출기(tandem extruder)(2)의 제 1압출부(4)에 폴리올레핀 레진(polyolefin resin): 97-80 중량부를 투입하고, 폴리올레핀 레진(polyolefin resin)이 제 1, 2 가스와 잘 혼합되어 T-다이까지 이송될 수 있도록 150℃ 온도를 유지하고, 120㎏/㎠에서 500㎏/㎠의 압력을 가한다.97-80 parts by weight of a polyolefin resin is put into the first extruding part 4 of a tandem extruder 2 and polyolefin resin is mixed well with the first and second gases to form T - The temperature is maintained at 150 ° C so that it can be transferred to the die, and a pressure of 500 kg / cm 2 is applied at 120 kg / cm 2.

그 상태에서, 제 1가스 주입부(8)를 통해 3 내지 18 중량부의 초임계 상태 이산화탄소를 주입하여 발포를 수행한다.In this state, 3 to 18 parts by weight of supercritical carbon dioxide is injected through the first gas injection part 8 to perform foaming.

부탄가스 및 초임계 상태의 보조가스를 이용한 폴리 올레핀계 시트 제조 실시예와 비교예Production Example of Polyolefin-Based Sheet Using Butane Gas and Supercritical Assistance Gas and Comparative Example 성형품 평가Molded product evaluation 성형압력
(㎏/㎠)
Molding pressure
(Kg / cm2)
배율(배)Magnification (times) 제품평가Product evaluation 압축강도Compressive strength 셀크기(㎛)Cell Size (탆)
실시예Example 4.64.6 3~53 to 5 용착도 60%이상, 수축율 2%이하로 제품사용 가능It can be used with 60% or more of weldability and 2% or less of shrinkage 3.633.63 80~10080-100 비교예Comparative Example 3.93.9 3~53 to 5 용착도 60%이상, 수축율 2% 내지 4%로 제품사용 가능60% or more of weldability and 2% to 4% shrinkage 3.053.05 150~180150 ~ 180

실시예와 비교예를 통해서 살펴보면, 본 발명의 실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트는 부탄가스만을 사용하여 발포된 비교예에 비해, 셀의 크기가 작고 압축강도가 크므로 종래의 셀보다 강하게 제조 가능하고, 성형시 셀이 깨지는 현상을 방지할 수 있게 된다.The polyolefin-based sheet using the butane gas and the carbon dioxide gas in the supercritical state according to the embodiment of the present invention, compared with the comparative example in which only the butane gas was foamed, Since the strength is high, it can be manufactured more strongly than conventional cells, and it is possible to prevent the cells from being broken at the time of molding.

한편, 본 발명의 실시예에 따른 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법은 단지 상기한 실시예에 한정되는 것이 아니라 그 기술적 요지를 이탈하지 않는 범위내에서 다양한 변경이 가능하다.
Meanwhile, the method for producing a polyolefin-based sheet using butane gas and carbon dioxide gas in a supercritical state according to an embodiment of the present invention is not limited to the above-described embodiments, but various modifications This is possible.

4:제 1압출부, 6:제 1이송부,
8:제 1가스 주입부, 10:제 2압출부,
12:제 2가스 주입부, 14:제 2이송부,
16:T-다이.
4: first extruding part, 6: first conveying part,
8: a first gas injection unit, 10: a second extrusion unit,
12: second gas injection unit, 14: second transfer unit,
16: T-die.

Claims (2)

탄뎀 압출기(tandem extruder)(2)의 제 1압출부(4)에 폴리올레핀 레진(polyolefin resin): 97-80 중량부를 투입하고, 폴리올레핀 레진(polyolefin resin)이 제 1, 2 가스와 혼합되어 T-다이까지 이송될 수 있도록 150℃ 온도를 유지하고, 120㎏/㎠에서 500㎏/㎠의 압력을 가하고, 제 1압출부(4)에 형성된 제 1가스 주입부(8)를 통해 1.5 내지 9 중량부의 초임계 상태의 이산화탄소를 주입하고, 제 1압출부(4)와 연결된 제 2압출부(10)에 형성된 제 2가스 주입부(12)를 통해 초임계 상태의 1.5 내지 9 중량부의 부탄가스를 주입하여 발포하며;
상기 초임계 상태의 이산화탄소는 공급 온도가 30℃-60℃이고, 공급 압력이 7.38-50Mpa인 것을 특징으로 하는 부탄가스 및 초임계 상태의 이산화탄소 가스를 이용한 폴리 올레핀계 시트의 제조방법.


97-80 parts by weight of a polyolefin resin is charged into the first extruded portion 4 of the tandem extruder 2 and a polyolefin resin is mixed with the first and second gases to form a T- The pressure was applied at 120 kg / cm 2 at a pressure of 500 kg / cm 2, and the pressure was applied to the first extruding part 4 through the first gas injecting part 8 to a pressure of 1.5 to 9 wt. Carbon dioxide in the supercritical state is injected and 1.5 to 9 parts by weight of butane gas in the supercritical state is injected through the second gas injection unit 12 formed in the second extruding unit 10 connected to the first extruding unit 4 Injection and foaming;
Wherein the carbon dioxide in the supercritical state has a feed temperature of 30 ° C to 60 ° C and a feed pressure of 7.38 to 50 MPa. The method of producing a polyolefin-based sheet using the carbon dioxide gas of butane gas and supercritical state.


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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020120022A1 (en) 2000-12-27 2002-08-29 Shau-Tarng Lee Expandable composition, blowing agent, and process for extruded thermoplastic foams
KR100719487B1 (en) * 2006-04-20 2007-05-18 한국에너지기술연구원 Manufacturing method for polyolefin forming material using supercritical fluid

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020120022A1 (en) 2000-12-27 2002-08-29 Shau-Tarng Lee Expandable composition, blowing agent, and process for extruded thermoplastic foams
KR100719487B1 (en) * 2006-04-20 2007-05-18 한국에너지기술연구원 Manufacturing method for polyolefin forming material using supercritical fluid

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