KR20230056101A - Film type foam sheet with improved impact resistance and manufacturing method thereof - Google Patents
Film type foam sheet with improved impact resistance and manufacturing method thereof Download PDFInfo
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- KR20230056101A KR20230056101A KR1020210139236A KR20210139236A KR20230056101A KR 20230056101 A KR20230056101 A KR 20230056101A KR 1020210139236 A KR1020210139236 A KR 1020210139236A KR 20210139236 A KR20210139236 A KR 20210139236A KR 20230056101 A KR20230056101 A KR 20230056101A
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- foam sheet
- film
- type foam
- thermally expandable
- expandable microcapsules
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- 239000006260 foam Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000003094 microcapsule Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 15
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 229920001684 low density polyethylene Polymers 0.000 claims description 5
- 239000004702 low-density polyethylene Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 3
- 150000001336 alkenes Chemical class 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 abstract 1
- 210000000497 foam cell Anatomy 0.000 abstract 1
- 238000005187 foaming Methods 0.000 description 14
- 239000004088 foaming agent Substances 0.000 description 12
- 229920000098 polyolefin Polymers 0.000 description 11
- 239000000126 substance Substances 0.000 description 6
- 239000004594 Masterbatch (MB) Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229940127554 medical product Drugs 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/206—Using expandable particles or beads as starting material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
- B29K2021/003—Thermoplastic elastomers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0625—LLDPE, i.e. linear low density polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0076—Microcapsules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
본 발명은 발포배율이 높고 표면 거칠음이 없는 우수한 표면품질을 갖는 전기자동차용 친환경 필름형 발포시트 및 이의 제조방법에 관한 것으로서, 더욱 상세하게는, 압출성형에 의해 열팽창성 마이크로 캡슐의 발포가 균일하게 실시됨으로써, 발포밀도가 낮고, 우수한 외관 및 기존 박막 발포체에 비해 얇으면서도 내충격성 및 복원력이 우수하고 열에 의한 수축성을 최소화한 전기자동차용 친환경 필름형 발포시트 및 이의 제조방법에 관한 것이다.The present invention relates to an eco-friendly film-type foam sheet for electric vehicles having a high foaming ratio and excellent surface quality without surface roughness and a method for manufacturing the same, and more particularly, to uniform foaming of thermally expandable microcapsules by extrusion molding. By being carried out, it relates to an eco-friendly film-type foam sheet for electric vehicles with low foaming density, excellent appearance, and excellent impact resistance and resilience while being thinner than conventional thin film foams and minimizing shrinkage due to heat, and a method for manufacturing the same.
일반적으로 폴리올레핀계 발포시트는 두께 및 발포밀도를 변화시킴으로써 단열성, 흠음성, 완충성 등의 특징을 가지기 때문에 여러 가지 용도로 이용되고 있다. 이와 같은 폴리올레핀계 발포체는 발포제 적용방법에 따라 화학발포제 혹은 물리발포제 등이 적용되고 있다. 화학발포제는 주로 파우더형태로 적용되는데 열에 의해 분해되어 가스를 발생시킴으로써, 용융된 수지가 팽창되어 밀도를 낮추는 방식이며, 물리발포제는 주로 압출기 혹은 사출기 내에서 용융된 수지 매트릭스에 강제로 가스를 주입시켜 밀도를 낮추는 방식이다.In general, polyolefin-based foam sheets are used for various purposes because they have characteristics such as heat insulation, sound absorption, and buffering by changing the thickness and foam density. Such a polyolefin-based foam is applied with a chemical foaming agent or a physical foaming agent according to the application method of the foaming agent. Chemical foaming agents are mainly applied in the form of powder, which is decomposed by heat to generate gas, which expands the molten resin to lower the density. Physical foaming agents are mainly used by forcibly injecting gas into the molten resin matrix way to reduce the density.
화학발포제를 사용하는 경우 주로 가교 메카니즘을 적용한 수지 매트릭스를 고온의 열을 가하여 수지를 팽창시키는데, 셀의 크기가 불균일할 뿐만 아니라 분해되지 않은 잔유물이 남아있어 발포시트의 물성을 저하시키는 문제점도 있다. 특히 화학발포제를 적용한 0.3mm 이하의 발포시트는 셀 크기의 불균일성 및 시간경과에 따른 공기와의 치환성에 의해 탄성, 복원력 등이 저하되고, 전부 독립기포가 형성되지 않아 내충격성이 요구되는 발포체로서의 고유 기능을 발휘하지 못하는 문제점을 가지고 있다.In the case of using a chemical foaming agent, the resin is expanded by applying high-temperature heat to a resin matrix to which a crosslinking mechanism is applied, and the size of the cells is non-uniform, and undecomposed residues remain, which deteriorates the physical properties of the foam sheet. There is also a problem. In particular, foam sheets with a thickness of 0.3 mm or less to which a chemical foaming agent is applied have reduced elasticity and resilience due to non-uniformity of cell size and substitution with air over time, and are unique as foams requiring impact resistance because independent cells are not formed at all. It has a problem that does not function properly.
물리발포제를 사용하여 발포시트를 제조하는 경우 압출기의 다이에서 직접 발포시키는 것으로, 일반적으로 셀 크기가 불균일하고, 큰 기포가 형성되며, 표면이 고르지 못하고 박막의 발포시트 생산은 어려워, 적용범위가 한정되는 문제점을 가지고 있다.When manufacturing a foam sheet using a physical foaming agent, it is directly foamed in the die of an extruder. Generally, the cell size is non-uniform, large bubbles are formed, the surface is uneven, and it is difficult to produce a foam sheet of a thin film, so the scope of application is limited. has a problem with
대한민국 공개특허공보 10-2011-0136921호에서는 가전제품의 충격흡수용 발포 포장시트를 제조하는 기술이 공지되어 있으나, 이러한 포장시트는 두께가 15㎜로서 너무 두꺼워 제품의 외관을 포장하는데 불과하다. 모바일이나 TV 가전, 자동차 등에 적용되어 완충재 및 실링재로서 사용되는 필름형 발포시트의 경우 폴리올레핀계 발포시트의 내충격성, 복원성, 기타 물성이 저하되지 않으면서도 0.5㎜ 이하 두께의 필름형 발포시트가 필요하므로 이러한 필름형 발포시트의 개발이 필요한 실정이다.Korean Patent Laid-open Publication No. 10-2011-0136921 discloses a technique for manufacturing a shock-absorbing foam packaging sheet for home appliances, but such a packaging sheet has a thickness of 15 mm and is so thick that it merely wraps the exterior of the product. In the case of film-type foam sheets used as buffering and sealing materials applied to mobile devices, TV home appliances, and automobiles, film-type foam sheets with a thickness of 0.5 mm or less are required without deteriorating the impact resistance, recovery properties, and other physical properties of polyolefin-based foam sheets. There is a need to develop such a film-type foam sheet.
본 발명은 상기와 같은 종래기술을 감안하여 안출된 것으로서, 탄성 및 복원력이 우수하며, 또한 표면의 굴곡 및 거칠음이 없는 미려한 외관을 갖는 열팽창성 마이크로 캡슐을 적용한 필름형 발포시트를 제공하는 것을 그 목적으로 한다.The present invention has been made in view of the prior art as described above, and the object of the present invention is to provide a film-type foam sheet to which thermally expandable microcapsules are applied, which has excellent elasticity and restoring force, and has a beautiful appearance free from curves and roughness on the surface. to be
또한, 열팽창성 마이크로 캡슐이 균일하게 분산됨으로써 박막의 발포시트를 형성할 수 있는 발포시트의 제조방법을 제공하는 것을 그 목적으로 한다.In addition, it is an object of the present invention to provide a method for manufacturing a foam sheet capable of forming a thin foam sheet by uniformly dispersing thermally expandable microcapsules.
상기와 같은 과제를 해결하기 위한 본 발명의 필름형 발포시트는 열팽창성 마이크로 캡슐이 함유된 폴리올레핀 수지를 포함하는 필름형 발포시트로서, 상기 필름형 발포시트는 독립기포를 균일하게 가지며, 기포의 셀 직경이 60~100㎛, 밀도가 0.7g/㎖ 이하, 시트의 두께가 0.5㎜ 이하인 것을 특징으로 한다.The film-type foam sheet of the present invention for solving the above problems is a film-type foam sheet containing a polyolefin resin containing thermally expandable microcapsules, wherein the film-type foam sheet has independent cells uniformly and cells of the cells It is characterized by having a diameter of 60 to 100 μm, a density of 0.7 g/ml or less, and a sheet thickness of 0.5 mm or less.
이때, 상기 폴리올레핀 수지 100 중량부에 대하여 상기 열팽창성 마이크로 캡슐이 0.5~15 중량부 함유될 수 있다.In this case, 0.5 to 15 parts by weight of the thermally expandable microcapsules may be contained based on 100 parts by weight of the polyolefin resin.
또한, 상기 폴리올레핀 수지는 저밀도 폴리에틸렌, 선형 저밀도 폴리에틸렌, EVA수지, 올레핀계 열가소성 엘라스토머 중 어느 하나 또는 그 이상일 수 있다.In addition, the polyolefin resin may be any one or more of low density polyethylene, linear low density polyethylene, EVA resin, and olefin-based thermoplastic elastomer.
본 발명에 따른 필름형 발포성형체는 압출성형에 의해 제조되는 것으로서, 폴리올레핀 수지와 팽창개시온도가 150~210℃인 열팽창성 마이크로 캡슐을 혼합하여 혼합물을 제조하는 단계, 상기 혼합물을 상기 열팽창성 마이크로 캡슐의 팽창개시온도 이상으로 압출기 내에서 가열하고 T-다이 또는 회전형 다이(circular-die)에 통과시켜 두께가 0.5㎜ 이하의 필름형 발포시트를 연속적으로 제조하는 단계를 포함하여 제조될 수 있다.The film-type foamed molded article according to the present invention is produced by extrusion molding, comprising the steps of preparing a mixture by mixing a polyolefin resin and thermally expandable microcapsules having an expansion initiation temperature of 150 to 210° C., and mixing the mixture with the thermally expandable microcapsules. It can be prepared by heating in an extruder to an expansion start temperature or higher and passing it through a T-die or a circular-die to continuously produce a film-like foam sheet having a thickness of 0.5 mm or less.
본 발명에 따른 필름형 발포시트는 열팽창성 마이크로 캡슐을 적용함으로써 탄성 및 복원력이 우수하며, 또한 표면의 굴곡 및 거칠음이 없는 미려한 외관을 나타낼 수 있다.The film-type foam sheet according to the present invention has excellent elasticity and restoring force by applying thermally expandable microcapsules, and can also exhibit a beautiful appearance without curvature and roughness on the surface.
또한, 본 발명의 발포시트 제조방법에 따르면 열팽창성 마이크로 캡슐이 균일하게 분산됨으로써 박막의 발포시트를 제조할 수 있는 효과를 나타낸다.In addition, according to the foam sheet manufacturing method of the present invention, thermally expandable microcapsules are uniformly dispersed, thereby producing a thin foam sheet.
도 1은 본 발명의 실시예에 따른 박막 폴리올레핀 필름형 발포시트의 모식도이다.1 is a schematic diagram of a thin polyolefin film-type foam sheet according to an embodiment of the present invention.
이하 본 발명을 보다 상세히 설명한다. 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다.Hereinafter, the present invention will be described in more detail. Terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventor may appropriately define the concept of terms in order to explain his or her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.
본 발명의 필름형 발포시트는 열팽창성 마이크로 캡슐이 함유된 폴리올레핀 수지를 포함하는 필름형 발포시트로서, 상기 필름형 발포시트는 독립기포를 균일하게 가지며, 기포의 셀 직경이 60~100㎛, 밀도가 0.7g/㎖ 이하, 시트의 두께가 0.5㎜ 이하인 것을 특징으로 한다.The film-type foam sheet of the present invention is a film-type foam sheet containing a polyolefin resin containing thermally expandable microcapsules. is 0.7 g/ml or less, and the thickness of the sheet is 0.5 mm or less.
상기 필름형 발포시트는 독립기포를 균일하게 갖기 때문에 내충격성, 단열성, 복원성 등이 우수하여 모바일이나, TV 가전, 전기 자동차 등에 적용되어 친환경 완충재 및 실링재로 사용될 수 있으며, 특히 모바일이나 TV 가전에 사용되기에 적합한 특성을 나타낸다.Since the film-type foam sheet has independent cells uniformly, it has excellent impact resistance, heat insulation, and resilience, so it can be applied to mobile, TV home appliances, electric vehicles, etc. and used as an eco-friendly cushioning material and sealing material. Indicates characteristics suitable for becoming.
또한, 상기 필름형 발포시트는 발포 배율의 하한이 1.5배이며 상한이 5배인 것이 바람직하다. 발포 배율이 1.5배 보다 낮으면 내충격성 및 단열성이 저하되며, 5배 보다 높으면 강성이 저하되며 표면 거칠기가 높아져 표면이 균일하지 않은 문제점을 나타내기 때문이다.In addition, it is preferable that the lower limit of the expansion ratio of the film-type foam sheet is 1.5 times and the upper limit is 5 times. This is because when the foaming ratio is lower than 1.5 times, the impact resistance and thermal insulation properties are lowered, and when the expansion ratio is higher than 5 times, the rigidity is lowered and the surface roughness is increased, resulting in a problem of non-uniformity of the surface.
또한, 상기 필름형 발포시트는 유기계 및 무기계 화학발포제가 첨가되어 있지 않으며, 화학 가교제 첨가 및 물리적 가교가 적용되지 않는다. 따라서 리사이클의 관점에서 유리한 장점을 나타낸다.In addition, the film-type foam sheet does not contain organic or inorganic chemical foaming agents, and neither chemical crosslinking agent nor physical crosslinking is applied. Therefore, it represents an advantageous advantage from the point of view of recycling.
상기 필름형 발포시트는 다음과 같은 제조방법을 통해 제조될 수 있다. The film-type foam sheet may be manufactured through the following manufacturing method.
일 실시예에서 상기 필름형 발포시트는 압출코팅에 의해 제조될 수 있다. 구체적으로는 폴리올레핀계 캐리어 레진에 열팽창 마이크로 캡슐을 고농축한 마스터배치와 순수 폴리올레핀계 수지를 압출기 호퍼를 통하여 투입한 후 용융시키고 T-다이에서 필름형태의 발포체로 제작을 한 후 와인딩을 하여 제조할 수 있다. 이때 압출 시 이형지 위에 발포된 필름을 코팅하여 제조할 수도 있다. 또한, 상기 열팽창성 마이크로 캡슐의 발포개시온도 범위는 150~210℃이다.In one embodiment, the film-type foam sheet may be manufactured by extrusion coating. Specifically, a masterbatch in which thermally expandable microcapsules are highly concentrated in a polyolefin-based carrier resin and a pure polyolefin-based resin are introduced through an extruder hopper, melted, and formed into a foam in the form of a film in a T-die, followed by winding. there is. At this time, it may be prepared by coating a foamed film on the release paper during extrusion. In addition, the range of the foaming initiation temperature of the thermally expandable microcapsules is 150 ~ 210 ℃.
또 다른 실시예에서 상기 필름형 발포시트는 폴리올레핀계 캐리어 레진에 열팽창 마이크로 캡슐을 고농축한 마스터배치와 순수 폴리올레핀계 수지를 압출기 호퍼를 통하여 투입한 후 용융혼련시키고 회전형 다이에서 필름 형태의 발포체로 제작을 한 후 와인딩을 하여 제조할 수 있다. 이때 열팽창성 마이크로 캡슐의 발포개시온도 범위는 150~210℃이다.In another embodiment, the film-type foam sheet is produced by melting and kneading a masterbatch in which thermally expandable microcapsules are highly concentrated in a polyolefin-based carrier resin and a pure polyolefin-based resin through an extruder hopper, and then produced as a film-type foam in a rotary die. After that, it can be manufactured by winding. At this time, the range of the foaming initiation temperature of the thermally expandable microcapsules is 150 to 210 ° C.
상기의 T-다이 또는 회전형 다이 방식으로 제조된 필름형 발포시트는 종래의 전자선가교 발포방식으로 제조된 박막 발포시트에 비해 생산속도가 훨씬 빠르고, 보다 박막화 시킬 수 있으며, 생산과정에서 강제 연신에 의한 두께 조정을 하지 않으므로 사용과정에서 수축이 발생되지 않는 장점이 있다. 특히, 독립기포 비율이 높아 내충격성이 보다 우수한 특징을 가진다.Compared to the thin film foam sheet manufactured by the conventional electron beam crosslinking foaming method, the film-type foam sheet produced by the T-die or rotary die method has a much faster production rate and can be made thinner, and is subject to forced stretching during the production process. It has the advantage that shrinkage does not occur in the process of use because it does not adjust the thickness by In particular, the ratio of closed cells is high, and the impact resistance is more excellent.
상기 용융혼련 공정에 있어서, 열팽창성 마이크로 캡슐의 바람직한 함량은 매트릭스 수지 100중량부에 대해 0.5 내지 15중량부이다. 0.5중량부 미만이면, 얻어지는 발포시트의 밀도가 높아져 내충격성이 저하되고, 15 중량부를 초과하면 얻어지는 필름형 발포시트의 표면 품질이 낮아져 적용 등의 면에서 문제가 되는 경우가 있다. 보다 바람직한 열팽창성 마이크로 캡슐의 적용범위는 1~5중량부이다.In the melt-kneading step, the preferred content of the thermally expandable microcapsules is 0.5 to 15 parts by weight based on 100 parts by weight of the matrix resin. If it is less than 0.5 parts by weight, the density of the obtained foam sheet increases and the impact resistance decreases, and if it exceeds 15 parts by weight, the surface quality of the film-type foam sheet obtained decreases, which may cause problems in terms of application. A more preferable application range of the thermally expandable microcapsules is 1 to 5 parts by weight.
상기 열팽창성 마이크로캡슐은, 마이크로스피어라고 불리며 열에 의해 팽창하는 타입의 물리 발포제로. 고분자물질로 이루어진 벽재(shell)가 휘발성 가스 발포제(core)를 내포하고 있는 구조로 가열 시 지름이 5배까지 팽창하고. 완전한 독립 기포셀을 만들며, 미세한 셀을 구현할 수 있는 특징이 있다.The thermally expandable microcapsules are called microspheres and are a type of physical foaming agent that expands with heat. It is a structure in which a shell made of polymer material contains a volatile gas foaming agent (core), and the diameter expands up to 5 times when heated. It makes a completely independent bubble cell and has the characteristic of realizing a fine cell.
상기 열팽창성 마이크로 캡슐의 발포 후 독립기포의 셀 직경은 60~100㎛ 범위이다. 60㎛ 미만이면, 셀이 지나치게 작아 내충격성, 단열성 등의 발포시트에서 요구되는 성능을 만족시키지 못하고, 100㎛를 초과하면, 셀이 지나치게 커, 제조 후 시간경과에 따른 수축이 발생될 수 있으므로 셀의 직경 범위를 가지도록 제조된다.After foaming of the thermally expandable microcapsules, the cell diameter of the closed cells ranges from 60 to 100 μm. If it is less than 60 μm, the cell is too small to satisfy the performance required of the foam sheet, such as impact resistance and heat insulation, and if it exceeds 100 μm, the cell is too large, and shrinkage may occur over time after manufacturing, so the cell It is manufactured to have a diameter range of.
상기 용융혼련 공정에 있어서, 가공안정성을 향상시키기 위해, 예를 들어 탈크, 탄산칼슘, 벤토나이트 및 제올라이트 중 선택된 하나의 물질을, 매트릭스 수지 100중량부에 대해 0.5~5중량부 범위에서 적용할 수 있다. 상기 하한치에 미달하면 용융수지의 가공혼련성 증진에 효과를 발휘하지 않아 목적을 달성할 수 없고, 상기 상한치를 초과하면 첨가량 증대에 따른 공정안정성 및 제품의 물성이 저하되어 바람직하지 못하다.In the melt-kneading process, in order to improve processing stability, for example, one selected from talc, calcium carbonate, bentonite and zeolite may be applied in the range of 0.5 to 5 parts by weight based on 100 parts by weight of the matrix resin. . If it is less than the above lower limit, it is not effective in improving the processing kneading property of the molten resin, so the purpose cannot be achieved, and if it exceeds the above upper limit, process stability and physical properties of the product are deteriorated due to the increase in the amount added, which is undesirable.
상기 폴리올레핀계 수지로서는, 특별히 한정되지는 않지만, 예를 들어 저밀도 폴리에틸렌, 선상 저밀도 폴리에틸렌, 에틸렌-a-올레핀 공중합체, 폴리올레핀계 열가소성 엘라스토머, 에틸렌-아세트산 공중합체에서 선택된 중합체를 단독 또는 혼합하여 사용할 수 있다. 바람직하게는 저밀도 폴리에틸렌, 에틸렌-a-올레핀 공중합체를 단독 혹은 혼합하여 사용할 수 있다.The polyolefin-based resin is not particularly limited, but for example, polymers selected from low-density polyethylene, linear low-density polyethylene, ethylene-a-olefin copolymers, polyolefin-based thermoplastic elastomers, and ethylene-acetic acid copolymers may be used alone or in combination. there is. Preferably, low-density polyethylene and an ethylene-a-olefin copolymer may be used alone or in combination.
상기 폴리올레핀계 수지의 용융점도는 특별히 한정되지 않는다. 발포시에 열 팽창성 마이크로 캡슐이 풍선과 같은 역할을 하여, 가스가 외부로 방출되지 않는 점에서, 화학발포제를 이용하여 실시하는 경우와 달리, 수지의 용융점도가 낮아도 된다.The melt viscosity of the polyolefin-based resin is not particularly limited. Unlike the case of using a chemical foaming agent, the melt viscosity of the resin may be low because the thermally expandable microcapsules act like balloons during foaming and no gas is released to the outside.
상기 폴리올레핀계 필름형 발포시트의 두께는 0.5㎜ 이하, 바람직하게는 0.03~0.5㎜, 더욱 바람직하게는 0.05~0.2㎜이다. 발포시트의 두께가 0.03㎜ 이하면 내충격성이 저하되고, 0.5㎜를 초과하면, 특히, 그것을 전자기기를 구성하는 부품을 기기본체에 고정하기 위해서 사용할 경우 이들 기기들의 박형화를 달성할 수 없게 되므로 바람직하지 못하다.The thickness of the polyolefin-based film-type foam sheet is 0.5 mm or less, preferably 0.03 to 0.5 mm, more preferably 0.05 to 0.2 mm. If the thickness of the foam sheet is 0.03 mm or less, the impact resistance is lowered, and if it exceeds 0.5 mm, it is preferable because it is not possible to achieve thinning of these devices, especially when it is used to fix the parts constituting the electronic device to the device body. can't
또한, 상기 폴리올레핀계 필름형 발포시트는 편면 또는 양면에 점착제를 도포하여 점착테이프를 구성함으로써, 전자기기를 구성하는 부품을 기기본체에 접착 고정하기 위해서 사용될 수 있다. 상기 점착테이프는 필름형 발포시트의 적어도 어느 한 면에 형성된 구성된 점착제 층을 구비하는 것이며, 점착제를 통해 다른 부재에 점착하는 것이 가능하게 된다.In addition, the polyolefin-based film-type foam sheet may be used to adhesively fix components constituting an electronic device to a device body by forming an adhesive tape by applying an adhesive to one or both sides of the foam sheet. The adhesive tape has a pressure-sensitive adhesive layer formed on at least one side of the film-type foam sheet, and can be adhered to another member through the adhesive.
상기 점착제 층을 도포하기 위해 폴리올레핀계 필름형 발포시트의 한면 또는 양면에 코로나 혹은 플라즈마 처리를 실시할 수 있다. 이들 방법에 의해 점착력 향상을 위한 표면에너지를 높일 수 있는데, 이때 바람직한 표면에너지는 36~50dyne 범위이다. 보다 바람직한 표면에너지는 42~45dyne이다.In order to apply the pressure-sensitive adhesive layer, corona or plasma treatment may be performed on one or both sides of the polyolefin film-type foam sheet. By these methods, it is possible to increase the surface energy for improving adhesion, and the preferred surface energy in this case is in the range of 36 to 50 dyne. A more preferred surface energy is 42 to 45 dyne.
이러한 제조방법에 의해 수득되는 필름형 발포시트는 발포배율이 높고 표면 거칠음이 없게 된다. 또한, 압출코팅 성형에 의해 열팽창성 마이크로 캡슐의 발포가 균일하게 실시됨으로써, 발포밀도가 낮고, 우수한 외관 및 기존 박막 발포체에 비해 얇으면서도 내충격성 및 복원력이 우수하고 열에 의한 수축성을 최소화한 필름형 발포시트를 제조할 수 있다. 또한, 두께를 조절하기 위한 연신과정이 불필요하여 제조공정의 단순화 및 원가절감의 효과가 있다.The film-type foam sheet obtained by this manufacturing method has a high expansion ratio and no surface roughness. In addition, as the thermally expandable microcapsules are foamed uniformly by extrusion coating molding, the foaming density is low, excellent appearance, and thinner than conventional thin film foams, but excellent impact resistance and resilience, and minimizing shrinkage due to heat. Film-type foam sheets can be made. In addition, since a stretching process for adjusting the thickness is unnecessary, there is an effect of simplifying the manufacturing process and reducing costs.
또한, 상기 폴리올레핀계 필름형 발포 시트는 우수한 압축복원력을 가지므로 전자기기에 적용 시 부품간의 충격을 효과적으로 흡수하며, 압축영구 줄음률이 낮아 부품간의 단차발생을 최소화할 수 있으므로 부품간 밀착성 및 충격흡수를 용이하게 하는 패킹재(gasket), 완충제, 스포츠용품, 의료용품 혹은 자동차 배터리의 셀(cell)간의 실링재 등에 적용할 수 있다. In addition, since the polyolefin-based film-type foam sheet has excellent compression resilience, it effectively absorbs impact between parts when applied to electronic devices, and since the compression permanent set is low, the occurrence of steps between parts can be minimized, so that adhesion between parts and shock absorption It can be applied to a gasket, a buffer, a sports product, a medical product, or a sealing material between cells of an automobile battery that facilitates.
이하에 실시예를 들어 본 발명을 더욱 상세히 설명하지만, 본 발명은 이들 실시예에만 한정되는 것은 아니다.The present invention will be described in more detail by way of examples below, but the present invention is not limited only to these examples.
[마스터배치 펠릿의 제작][Production of Masterbatch Pellets]
펠릿상의 저밀도 폴리에틸렌 100 중량부를 반바리 믹서에서 용융 시키고, 약 140℃가 된 시점에서 열팽창성 마이크로 캡슐을 15 중량부 첨가하고 추가로 30초간 혼련한 후 압출함과 동시에 펠릿화하여 마스터배치를 얻었다.100 parts by weight of pellet-shaped low-density polyethylene was melted in a Banbari mixer, and at about 140 ° C., 15 parts by weight of thermally expandable microcapsules were added, kneaded for 30 seconds, extruded and pelletized at the same time to obtain a masterbatch.
[필름형 발포시트 제작][Production of film-type foam sheet]
수득된 마스터배치와 폴리올레핀계 수지를 혼합하여, 얻어진 혼합 펠릿을 압출성형기의 호퍼를 통해 공급하고 용융혼련하여 T-Die 혹은 Circular-Die를 통해 필름형 발포시트를 얻었다. 성형조건은, 실린더 온도: 200~320℃, T-다이 온도: 320℃, 코팅속도: 30~80m/min.의 조건으로 실시하였다.The obtained masterbatch and polyolefin-based resin were mixed, and the obtained mixed pellets were supplied through the hopper of an extruder and melt-kneaded to obtain a film-type foam sheet through T-Die or Circular-Die. Molding conditions were carried out under conditions of cylinder temperature: 200 to 320 ° C, T-die temperature: 320 ° C, and coating speed: 30 to 80 m / min.
[발포시트의 평가][Evaluation of foam sheet]
1) 발포배율: 발포후 필름시트의 질량을 두께로 나눈 값을 산출하여, 발포배율로 하였다.1) Foaming ratio: The value obtained by dividing the mass of the film sheet after foaming by the thickness was calculated as the foaming ratio.
2) 셀 직경의 측정: 얻어진 필름형 발포시트를 전자현미경을 이용하여 관찰함으로써, 셀 20개의 평균 직경을 셀 직경(㎛)으로 하였다. 2) Measurement of cell diameter: By observing the obtained film-like foam sheet using an electron microscope, the average diameter of 20 cells was determined as the cell diameter (μm).
표 1의 결과를 살펴보면, 제조된 필름형 발포시트의 셀 직경이 60~100㎛이며 밀도가 0.7g/㎖ 이하인 시트의 두께가 0.5㎜ 이하인 필름형 발포시트를 제조할 수 있는 것을 확인할 수 있었다.Looking at the results of Table 1, it was confirmed that the film-type foam sheet having a cell diameter of 60 to 100 μm and a density of 0.7 g/ml or less and a thickness of 0.5 mm or less of the prepared film-type foam sheet could be manufactured.
본 발명은 상술한 바와 같이 바람직한 실시예를 들어 설명하였으나, 상기 실시예에 한정되지 아니하며 본 발명의 정신을 벗어나지 않는 범위 내에서 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 다양한 변형과 변경이 가능하다. 그러한 변형예 및 변경예는 본 발명과 첨부된 특허청구범위의 범위 내에 속하는 것으로 보아야 한다.Although the present invention has been described with preferred embodiments as described above, it is not limited to the above embodiments, and various modifications and modifications can be made by those skilled in the art within the scope of not departing from the spirit of the present invention. Change is possible. Such modifications and variations are to be regarded as falling within the scope of this invention and the appended claims.
Claims (4)
A film-type foam sheet containing a polyolefin resin containing thermally expandable microcapsules, wherein the film-type foam sheet has uniformly closed cells, a cell diameter of 60 to 100 μm, and a density of 0.7 g/ml or less. Film-type foam sheet, characterized in that the thickness of 0.5 mm or less.
상기 폴리올레핀 수지 100 중량부에 대하여 상기 열팽창성 마이크로 캡슐이 0.5~15 중량부 함유되는 것을 특징으로 하는 필름형 발포시트.
The method of claim 1,
A film-type foam sheet, characterized in that 0.5 to 15 parts by weight of the thermally expandable microcapsules are contained based on 100 parts by weight of the polyolefin resin.
상기 폴리올레핀 수지는 저밀도 폴리에틸렌, 선형 저밀도 폴리에틸렌, EVA수지, 올레핀계 열가소성 엘라스토머 중 어느 하나 또는 그 이상인 것을 특징으로 하는 필름형 발포시트.
The method of claim 1,
The polyolefin resin is a film-type foam sheet, characterized in that any one or more of low density polyethylene, linear low density polyethylene, EVA resin, olefin-based thermoplastic elastomer.
폴리올레핀 수지와 팽창개시온도가 150~210℃인 열팽창성 마이크로 캡슐을 혼합하여 혼합물을 제조하는 단계;
상기 혼합물을 상기 열팽창성 마이크로 캡슐의 팽창개시온도 이상으로 압출기 내에서 가열하고 T-다이 또는 회전형 다이(circular-die)에 통과시켜 두께가 0.5㎜ 이하의 필름형 발포시트를 연속적으로 제조하는 단계;
를 포함하는 것을 특징으로 하는 필름형 발포시트의 제조방법.A method for producing the film-type foam sheet according to claim 1 by extrusion molding,
Preparing a mixture by mixing a polyolefin resin and thermally expandable microcapsules having an expansion initiation temperature of 150 to 210 ° C;
Heating the mixture in an extruder above the expansion initiation temperature of the thermally expandable microcapsules and passing it through a T-die or a circular-die to continuously prepare a film-type foam sheet having a thickness of 0.5 mm or less. ;
Method for producing a film-type foam sheet comprising a.
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