KR101772485B1 - Non-directional multi-layered film for water-proof - Google Patents

Non-directional multi-layered film for water-proof Download PDF

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KR101772485B1
KR101772485B1 KR1020150190092A KR20150190092A KR101772485B1 KR 101772485 B1 KR101772485 B1 KR 101772485B1 KR 1020150190092 A KR1020150190092 A KR 1020150190092A KR 20150190092 A KR20150190092 A KR 20150190092A KR 101772485 B1 KR101772485 B1 KR 101772485B1
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density polyethylene
hdpe
film
low density
surface layer
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KR1020150190092A
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KR20170079472A (en
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이보영
태재원
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이병일
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/14—Corona, ionisation, electrical discharge, plasma treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene

Abstract

본 발명은 방수시트용 무방향 다층무연신필름에 관한 것으로, 더욱 상세하게는, 다층 공압출 공냉방식으로 형성되며, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 이루어진 제1표층이 상부에 형성되고, 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)로 이루어진 코어층이 중심에 형성되며, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 이루어진 제2표층이 하부에 형성된다.
따라서, 다층으로 성형하여 층간내열을 조절함으로써, 인열강도가 향상되며, 내한성이 우수하고, 질기고 강함으로써, 내크랙성을 확보할 수 있을 뿐만 아니라, 우수한 신율과 이 신율에 무방향성을 제공함으로써, 콘크리트 구조체의 거동방향이 어느 방향으로 향한다 하더라도 무방향 고신율로 순응하기 때문에 방수시트가 깨지거나 크랙이 발생하는 문제점을 해소하여 방수성을 오랫동안 유지시켜주는 방수시트용 무방향 다층무연신필름을 제공한다.The present invention relates to a non-oriented multi-layer lead-free film for waterproof sheets, and more particularly, to a multi-layer coextrusion air- (HDPE), a high density polyethylene (HDPE), and a high density polyethylene (HDPE) are formed on the first surface layer formed by mixing a low density polyethylene And a second surface layer made of a mixture of polyethylene and metallocene low density polyethylene (M.PE) is formed at the bottom.
Therefore, by controlling the interlaminar heat resistance by forming into a multilayer, the tear strength is improved, the cold resistance is excellent, the quality is high, the crack resistance is ensured, and the excellent stretch ratio and the non-directional Layered lead-free film for a waterproof sheet to maintain the waterproof property for a long time by eliminating the problem of cracking or cracking of the waterproof sheet due to compliance with the high directional elongation of the concrete structure regardless of the direction in which the concrete structure moves. to provide.

Description

방수시트용 무방향 다층무연신필름{NON-DIRECTIONAL MULTI-LAYERED FILM FOR WATER-PROOF}{Non-DIRECTIONAL MULTI-LAYERED FILM FOR WATER-PROOF}

본 발명은 방수시트용 무방향 다층무연신필름에 관한 것으로, 특히, 다층 공압출 공냉방식으로 무방향 고신율의 다층필름을 성형하여 층간내열을 조절하고, 인열강도와 내한성이 향상됨으로써, 방수시트에 적용할 경우, 콘크리트 구조체의 거동이 어느 방향으로 향한다 하더라도 방수시트가 무방향 고신율로 순응하게 하기 때문에 방수시트가 깨지거나 크랙이 발생하는 문제점을 해소하여 방수성이 오랫동안 유지되게 하는 방수시트용 무방향 다층무연신필름에 관한 것이다.The present invention relates to a non-oriented multi-layer non-extensible film for waterproof sheet, and more particularly, to a multi-layer coextrusion air cooling system for forming a multi-layer film having a high non- The waterproof sheet is prevented from cracking or cracking because the waterproof sheet conforms to the high-elongation ratio in the non-direction regardless of the direction of the behavior of the concrete structure, so that the waterproof sheet can be maintained for a long time Oriented multi-layer lead-free film.

종래의 방수 공법은 도막을 형성하는 도막 방수, 방수시트를 이용하는 시트 방수, 방수시트와 도막층을 형성하는 복합 방수 등으로 분류된다.The conventional waterproofing method is classified into waterproof coating for forming a coating film, waterproofing sheet using a waterproofing sheet, and composite waterproofing for forming a waterproofing sheet and a coating layer.

상기 도막 방수 공법은 액상형 방수재를 바탕면에 수회 도포하여 방수층을 형성하는 공법으로 시공이 간편하고 복잡한 바탕면에 시공이 용이하고, 시공자의 전문성을 요하지 않는 장점이 있다.The above waterproofing method is a method in which a waterproof layer is formed by applying a liquid type waterproofing material to the base surface a plurality of times, thereby facilitating construction, facilitating construction on a complicated base surface, and not requiring expertise of the constructor.

그러나, 이와 같은 도막 방수 공법은 액상형 방수재를 수회 도포하여 방수층을 경화시키는데 상대적으로 많은 시간이 소요되는 문제점이 있고, 상기 방수층이 균일한 두께로 형성되지 않는 문제가 있으며, 이와 같은 문제로 상대적으로 얇게 형성된 방수층에서는 방수능력이 저하되는 문제점이 있다. 또한 수증기압에 따른 부풀음 현상이 발생되는 문제도 있다.However, such a coating waterproofing method has a problem that it takes a relatively long time to cure the waterproof layer by applying a liquid-type waterproofing material a few times, and there is a problem that the waterproof layer is not formed in a uniform thickness. The waterproof ability of the waterproof layer formed is deteriorated. Also, there is a problem that swelling occurs due to water vapor pressure.

상기 시트 방수 공법은 기 제작된 방수시트를 이용하고, 상기 방수시트를 열융착이나 접착제를 이용하여 방수시트를 바탕면에 부착하여 시공하는 방수 공법으로 이미 제품이 규격화되어 있어 방수층의 두께가 균일하게 형성되는 장점과 시공이 신속한 장점이 있다.The sheet waterproofing method is a waterproofing method in which a waterproof sheet is used and the waterproof sheet is attached to the base surface by using a heat seal adhesive or an adhesive and the product is standardized so that the thickness of the waterproof layer is uniform It has advantages of being formed and quick construction.

복합 방수 공법은 도막 방수 공법과 시트 방수 공법의 문제점들을 상호 보완하기 위하여 방수시트와 도막재를 동시에 사용하여 시공하는 공법으로 방수시트의 접합부위의 약점을 도막재로 보완하여 방수시트의 접합부위 결함을 제거하고, 도막재의 불균일한 시공 두께를 방수시트가 보완하여 방수층을 형성하는 공법이다.The composite waterproofing method is a method of applying waterproofing sheet and coating material simultaneously to complement the problems of the waterproofing method and the waterproofing method of the film. The weak point of the waterproofing sheet is complemented by the coating material, And the waterproof sheet compensates for the uneven coating thickness of the coating material to form a waterproof layer.

상기 방수시트는 합성수지나 합성고무 등의 폴리머를 섞어 성질을 개량시킨 아스팔트 등의 컴파운드를 원지에 붙여 시트를 만드는 공법으로, 내후성과 접착성이 우수하다. The waterproof sheet is a method of forming a sheet by adhering a compound such as asphalt mixed with a polymer such as a synthetic resin or a synthetic rubber to a base paper, and is excellent in weatherability and adhesion.

온도에 크게 영향받지 않으며 시트 간의 접착성이 좋은 장점이 있고, 일반 고무처럼 탄성이 우수하며 상처 및 충격에 대한 복원력이 우수하고 재료의 물성이 균질하고 불투수층을 형성하므로 방수 능력이 뛰어난 장점이 있다.It is not greatly influenced by temperature and has good adhesion between sheets. It has excellent elasticity like ordinary rubber, has excellent restoring force against scratches and impacts, has homogeneous physical properties of material, and has an excellent waterproof ability because it forms impervious layer.

여기서, 상기 방수시트의 구조는 도 1에 도시된 바와 같이 통상적으로 부직포(10)와, 이 부직포(10)의 상부에 접착되는 표면필름지(20)와, 부직포(10)의 하부에 함침되는 컴파운드로 된 방수층(30)과 그 하부에 부착되는 이형지(40)로 이루어진다. 1, the structure of the waterproof sheet is generally composed of a nonwoven fabric 10, a surface film 20 adhered to the upper portion of the nonwoven fabric 10, And a release paper 40 attached to the lower portion of the waterproof layer 30. [

상기한 방수시트가 방수시공된 후 바탕면이 거동함에 따라 표면필름지(20)가 바탕면의 거동에 대하여 어느 방향에서는 신율이 우수하여 바탕면의 거동에 순응하나 또 다른 방향에서는 신율이 만족할 만한 신율이 확보되지 못하기 때문에 그 힘을 견디지 못하고 파단되거나 찢어지는 등의 문제점이 발생하여 방수시트가 방수기능을 하지 못하는 문제점이 있었다.As the surface of the waterproof sheet is waterproofed and the surface of the waterproof sheet is moved, the surface film 20 conforms to the behavior of the surface of the waterproof sheet 20 due to excellent elongation in any direction with respect to the behavior of the surface, The waterproof sheet can not withstand the force, and the waterproof sheet is not waterproofed because of the problem that the waterproof sheet is broken or torn.

특히, 내열성이 낮을 경우 방수시트의 표면에서 주름이 발생함으로써, 방수시트가 들뜨게 하는 등의 문제점을 야기시키며, 컴파운드에 포함된 유분을 흡수하여 상부로 투과시킴으로써, 탈유현상을 완전히 방지하지는 못하는 문제점 및 컴파운드에 포함된 가소제 등의 탈유현상과 산화현상을 억제하지 못하게 되므로, 제품의 수명을 단축시킬 수밖에 없었던 구조적인 문제점이 있었다.Particularly, when the heat resistance is low, wrinkles are generated on the surface of the waterproof sheet, causing waterproof sheets to float, and absorbing the oil contained in the compound and permeating the water to the upper part, There is a structural problem in that the life of the product can not be shortened because the de-oil phase and oxidation phenomena contained in the compound can not be suppressed.

상기한 문제점을 해결하기 위하여 안출된 본 발명은 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)로 다층 공압출 공냉방식으로 필름을 성형하여 다층의 구조가 이루어지도록 하여 내열성을 향상시키면서 무방향 신율이 확보되게 함과 동시에 인장강도를 보강하고 저온에서의 깨짐현상을 방지하며, 컴파운드와 필름과의 접착유지력이 강화될 수 있게 하는 방수시트용 무방향 다층무연신필름을 제공하는 데 그 목적이 있다.In order to solve the above-described problems, the present invention provides a multilayer coextrusion air-cooling method in which a film is formed by high-density polyethylene (HDPE) and metallocene low-density polyethylene (M.PE) To improve the heat resistance while ensuring the non-directional elongation, to prevent the cracking at low temperature while reinforcing the tensile strength, and to strengthen the adhesive holding force between the compound and the film. And to provide a multilayered lead-free new film.

상기한 목적은, 다층 공압출 공냉방식으로 형성되며, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 이루어진 제1표층이 상부에 형성되고, 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)로 이루어진 코어층이 중심에 형성되며, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 이루어진 제2표층이 하부에 형성된 것을 특징으로 하는 방수시트용 무방향 다층무연신필름에 의해 달성된다.The above object is accomplished by a multilayer coextrusion air cooling method in which a first surface layer formed by mixing a high density polyethylene (HDPE) and a metallocene low density polyethylene (M.PE) (HDPE) and metallocene low density polyethylene (M.PE), which are formed of a core layer made of a metallocene low density polyethylene (M.PE) and a metallocene low density polyethylene Layered lead-free film for a waterproof sheet according to the present invention is characterized in that a second surface layer formed by mixing poly (ethylene terephthalate) and poly (ethylene terephthalate) is formed on the bottom.

여기서, 상기 제1표층과 제2표층은, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 50 중량% ~ 80 중량% : 20 중량% ~ 50 중량%로 혼합되어 이루어진다.Here, the first surface layer and the second surface layer may be formed of a mixture of high density polyethylene (HDPE) and metallocene low density polyethylene (M.PE) in an amount of 50 wt% to 80 wt% 50% by weight.

그리고, 상기 고밀도폴리에틸렌(HDPE, High Density Polyethylene)은, 밀도가 0.95 g/㎤ 이상, 용융점은 125℃ 이상, 파단점 응력 320 ㎏/㎠ 이상, 파단신율 500% 이상, VICAT 연화점 74℃ 이상인 물성을 가진다.The high density polyethylene (HDPE) has a density of 0.95 g / cm 3 or more, a melting point of 125 ° C or more, a breaking point stress of 320 kg / cm 2 or more, a elongation at break of 500% or more, and a VICAT softening point of 74 ° C or more I have.

또한, 상기 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)은, 밀도가 0.92 g/㎤ 미만, 용융점은 116℃ 이상, 인장강도(MD/TD)가 580/460 ㎏/㎠ 이상, 인열강도(MD/TD) 124/127 ㎏/㎠ 이상, 신율(MD/TD) 580/620% 이상, VICAT 연화점 74℃ 이상인 물성을 가진다.The metallocene low density polyethylene (M.PE) has a density of less than 0.92 g / cm 3, a melting point of at least 116 ° C, a tensile strength (MD / TD) of at least 580/460 kg / cm 2, (MD / TD) of not less than 124/127 kg / cm2, a elongation (MD / TD) of 580/620% or more, and a VICAT softening point of not less than 74 ° C.

또한, 상기 제1표층과 제2표층 중 적어도 어느 하나는 코로나방전가공하는 것이 바람직하다.Preferably, at least one of the first surface layer and the second surface layer is subjected to corona discharge processing.

본 발명은 다층 공압출 공냉방식으로 다층무연신필름을 성형하되, 메탈로센 저밀도폴리에틸렌을 사용하여 결정화 속도를 지연조절함으로써, 필름생산 시 기계반대방향으로 찢기는 현상을 개선하여 양질의 필름이 생산되게 하고, 고밀도폴리에틸렌과 메탈로센 저밀도폴리에틸렌을 혼합적용하여 저온 충격강도를 보강하고 내열성을 향상시켰으며, 메탈로센 저밀도폴리에틸렌에 의해 극성을 부여함으로써, 접착유지력을 향상시키고, 고밀도폴리에틸렌에 메탈로센 저밀도폴리에틸렌이 혼합된 다층필름구조로 신율을 향상시킴은 물론 방향성을 개선하는 효과를 가진다.The present invention relates to a multilayer coextruded air cooling method for forming a multilayer unleaded film and delaying the crystallization rate by using metallocene low density polyethylene to improve the tearing in the machine direction in the production of the film to produce a high quality film The low temperature impact strength is reinforced and the heat resistance is improved by applying high density polyethylene and metallocene low density polyethylene. By applying the polarity by the metallocene low density polyethylene, it is possible to improve the adhesive holding power, It is a multi-layer film structure in which low density polyethylene is mixed and has an effect of improving not only the elongation but also the directionality.

도 1은 종래 방수시트의 구조를 도시한 도면.
도 2는 본 발명에 따른 방수시트용 무방향 다층무연신필름의 구조를 도시한 도면.1 is a view showing the structure of a conventional waterproof sheet.
2 is a view showing a structure of a non-oriented multilayered non-oriented film for waterproof sheet according to the present invention.

도 2에 도시된 바와 같이 본 발명에 따른 방수시트용 무방향 다층무연신필름은 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 50 중량% ~ 80 중량% : 20 중량% ~ 50 중량%로 혼합되어 원료를 혼합하고 용융시켜 다이스로 공급하는 압출기의 제1스크류와 제2스크류에 투입되고, 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)을 제3스크류에 투입한다.2, the non-oriented multi-layered lead-free film for waterproof sheet according to the present invention comprises 50% by weight of High Density Polyethylene (HDPE) and Metallocene Low Density Polyethylene (M.PE) To 80% by weight: 20% by weight to 50% by weight, the raw materials are mixed, melted and fed into a dice, and the mixture is introduced into the first screw and the second screw of the extruder and mixed with metallocene low density polyethylene (M.PE, Density Polyethylene) into the third screw.

따라서, 상기 다이스를 통해 도 2에 도시된 바와 같이 제1스크류와 제2스크류에서 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 공급되면 다이스에서 제1표층과 제2표층을 성형하면서 그 중심에는 제3스크류에서 공급되는 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 코어층으로 형성되게 한 것이다.2, high density polyethylene (HDPE) and metallocene low density polyethylene (M.PE) are mixed and supplied from the first screw and the second screw through the die, The first surface layer and the second surface layer are formed in the die while the core layer is made of metallocene low density polyethylene (M.PE) supplied from the third screw.

상기한 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)의 혼합비를 살펴보면, 고밀도폴리에틸렌이 50 중량% 미만일 경우에는 결정화속도가 너무 지연될 뿐만 아니라, 고가의 메탈로센 저밀도폴리에틸렌이 50 중량%를 초과하므로, 원가가 상승하며, 고밀도폴리에틸렌의 함량이 80 중량%를 초과하면 결정화속도가 너무 빨라지므로 필름생산 시 기계반대방향으로 찢기는 현상이 매우 빈번하게 발생하므로, 양질의 필름생산이 곤란하며, 메탈로센 저밀도폴리에틸렌이 20 중량% 미만 혼합 시 결정화속도가 너무 빨라지므로 필름생산 시 찢기는 현상이 발생하고, 50 중량% 초과시 상기한 바와 같이 원가가 상승하므로, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)의 혼합비율은 소망하는 물성에 따라 50 중량% ~ 80 중량% : 20 중량% ~ 50 중량% 범위에서 설정하는 것이 바람직하다.When the mixing ratio of the high density polyethylene (HDPE) and the metallocene low density polyethylene (M.PE) is examined, when the content of the high density polyethylene is less than 50% by weight, not only the crystallization rate is delayed too much, When the content of the high-density polyethylene is more than 50 wt%, the cost increases. When the content of the high-density polyethylene is more than 80 wt%, the crystallization rate becomes too fast. Therefore, It is difficult to produce a high-quality film. When the metallocene low-density polyethylene is mixed in an amount of less than 20% by weight, the crystallization speed becomes too high, so that tearing occurs in the production of the film. When the content is more than 50% by weight, , High density polyethylene (HDPE) and metallocene low density polyethylene (M.PE, Metalloce ne Low Density Polyethylene) is preferably set in the range of 50% by weight to 80% by weight: 20% by weight to 50% by weight, depending on the desired properties.

여기서, 상기 고밀도폴리에틸렌(HDPE, High Density Polyethylene)은, 밀도가 0.95 g/㎤ 이상, 용융점은 125℃ 이상, 파단점 응력 320 ㎏/㎠ 이상, 파단신율 500% 이상, VICAT 연화점 74℃ 이상인 물성을 가지며, 상기 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)은, 밀도가 0.92 g/㎤ 미만, 용융점은 116℃ 이상, 인장강도(MD/TD)가 580/460 ㎏/㎠ 이상, 인열강도(MD/TD) 124/127 ㎏/㎠ 이상, 신율(MD/TD) 580/620% 이상, VICAT 연화점 74℃ 이상인 물성을 가진다.The high density polyethylene (HDPE) has a density of 0.95 g / cm 3 or more, a melting point of 125 ° C or more, a breaking point stress of 320 kg / cm 2 or more, a elongation at break of 500% or more, and a VICAT softening point of 74 ° C or more Wherein the metallocene low density polyethylene has a density of less than 0.92 g / cm 3, a melting point of at least 116 캜, a tensile strength (MD / TD) of at least 580/460 kg / cm 2, (MD / TD) of not less than 124/127 kg / cm2, a elongation (MD / TD) of 580/620% or more, and a VICAT softening point of not less than 74 ° C.

여기서, 상기한 VICAT 연화점은 바늘(Needle)이 시편 표면을 뚫고 1mm 들어 갔을 때의 온도를 말하며, MD와 TD는 컨베이어벨트로 흐르는 방향을 MD라 하고 흐르는 방향에 수직방향을 TD라고 한다.The VICAT softening point refers to the temperature at which the needles penetrate the surface of the specimen 1 mm, MD and TD denote the direction of flow to the conveyor belt, and TD denote the direction perpendicular to the direction of flow.

따라서, 본 발명에 따른 방수시트용 무방향 다층무연신필름은 고밀도폴리에틸렌으로만 필름을 생산할 때 결정화 속도가 빨라 기계 반대방향으로 찢어지는 현상이 발생하므로, 이를 보완하기 위하여 메탈로센 저밀도폴리에틸렌을 혼합함으로써, 결정화 속도를 지연조절할 수 있게 되었으며, 이에 따라, 기계 반대방향으로 찢어지는 현상을 방지할 수 있게 됨으로써, 양질의 필름 생산이 가능해 지는 것이다.Therefore, when the film is produced only with high-density polyethylene, the non-oriented multi-layered lead-free film for waterproof sheet according to the present invention tends to be torn in the opposite direction to the machine due to the rapid crystallization rate. Thus, the crystallization rate can be controlled in a delayed manner, thereby preventing the film from tearing in the machine direction, thereby enabling production of high-quality film.

즉, 상기한 제1표층과 제2표층은 밀도가 높아 경도가 우수하고, 저온 충격성과 신율이 향상된다.That is, the first surface layer and the second surface layer have high density and excellent hardness, and the low-temperature impact resistance and elongation are improved.

뿐만 아니라, 상기 코어층을 형성하는 메탈로센 저밀도폴리에틸렌은 밀도가 낮고 분자량의 분포가 좁아 결정화 속도가 낮으므로, 필름 생산 시 고분자로 이루어진 고체 물질 속에서, 구성단위인 미세 결정이나 고분자 사슬이 일정 방향으로 배열되는 배향성이 적으므로 인장강도가 우수하다.In addition, since the metallocene low-density polyethylene forming the core layer has a low density and a narrow distribution of molecular weight, the crystallization rate is low. Therefore, in a solid material made of a polymer at the time of film production, And thus the tensile strength is excellent.

결국, 상기 제1표층과 제2표층은 고밀도폴리에틸렌에 의해 인장강도와 내열성이 향상되고, 메탈로센 저밀도폴리에틸렌에 의하여 고신율에 따른 방향성이 배제되는 기능을 가지게 되며, 코어층의 메탈로센 저밀도폴리에틸렌에 의하여 고신율에 따른 방향성이 배제됨으로써, 고신율의 무방향 필름을 제작할 수 있게 되는 것이다.As a result, the first surface layer and the second surface layer are improved in tensile strength and heat resistance by high-density polyethylene, and have a function of eliminating the directionality according to the high elongation by the metallocene low-density polyethylene. The metallocene low- Directionality due to the high elongation is excluded by polyethylene, thereby making it possible to produce a high elongation non-oriented film.

여기서, 본 발명에 따른 방수시트용 무방향 다층무연신필름은 다층으로 성형되기 때문에 층간 내열성을 조절할 수 있으므로, 설계자 또는 제작자의 의도에 따라 다양한 기능의 필름을 제작할 수 있게 된다.Since the non-oriented multi-layered lead-free film for waterproof sheet according to the present invention is formed into a multilayer structure, it is possible to control the interlaminar heat resistance, thereby making it possible to produce films having various functions according to the intention of the designer or the manufacturer.

상기한 바와 같이 압출기에서 공압출방식으로 성형된 다층필름은 바람직하게는, 압출기에서 상향으로 필름이 10 ~ 20 m/min의 속도로 압출되어 일정거리 이송되는 과정에서 공냉방식으로 냉각된다.As described above, the multilayer film formed by the co-extrusion method in the extruder is preferably cooled by the air cooling method in the process of extruding the film upward at a speed of 10 to 20 m / min from the extruder and feeding the film at a predetermined distance.

상기한 공냉방식으로 일정거리 상향으로 이송되면서 냉각된 필름은 다수 개의 인장롤러 및 냉각롤러를 경유하고, 커팅공정과 권취공정을 통해 생산되며, 상기 제1표층과 제2표층 중 적어도 어느 하나는 코로나방전가공을 함으로써, 접착력을 향상된다.The cooled film is transferred through a plurality of tension rollers and cooling rollers and is produced through a cutting process and a winding process. At least one of the first surface layer and the second surface layer is transferred to the corona By performing the electric discharge processing, the adhesive force is improved.

한편, 상기한 메탈로센 저밀도폴리에틸렌은 무극성 소재에 극성을 부여함으로써, 제1표층과 제2표층에는 극성이 부여되고, 이러한 극성의 부여는 접착력을 유지시키고자 하는 접착유지력을 향상시켜 컴파운드와의 접착유지력이 향상되어 박리현상 또는 탈락현상을 방지하여 제품의 신뢰도를 향상시킬 수 있게 된다.On the other hand, the metallocene low density polyethylene described above imparts polarity to the non-polar material, so that polarity is imparted to the first surface layer and the second surface layer, and the application of such polarity improves the adhesive holding force to maintain the adhesive force, The adhesive holding force is improved to prevent the peeling phenomenon or the dropout phenomenon, thereby improving the reliability of the product.

따라서, 본 발명에 따른 방수시트용 무방향 다층무연신필름은 종래의 필름의 신율(TD/MD)이 800/300%인데 반하여 본 발명의 다층필름은 신율(TD/MD)이 850/820%이므로, 콘크리트 구조체에 의해 어느 방향에서 거동력이 발생한다 하더라도 무방향 고신율에 의하여 찢김, 파단현상을 방지할 수 있으며, 이에 따른, 주름발생이 방지되어 제품의 오랜사용과 신뢰도를 향상시킬 수 있게 되는 것이다.Accordingly, the multilayered film of the present invention has an elongation (TD / MD) of 850/820%, while the elongation (TD / MD) of the conventional film is 800/300% Therefore, it is possible to prevent tearing and breakage due to high directional elongation of the concrete structure regardless of the direction in which the concrete structure generates the torsional force in any direction. Accordingly, it is possible to prevent the occurrence of wrinkles, .

100 : 방수시트용 무방향 다층무연신필름
102 : 제1표층
104 : 코어층
106 : 제2표층100: Non-oriented multi-layered lead-free film for waterproof sheet
102: First surface layer
104: core layer
106: Second surface layer

Claims (5)

메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)로 이루어진 코어층이 중심에 형성되는 방수시트용 무방향 다층무연신필름에 있어서,
다층 공압출 공냉방식으로 형성되며, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 이루어진 제1표층이 상기 코어층의 상부에 형성되고, 고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 혼합되어 이루어진 제2표층이 상기 코어층의 하부에 형성되고,
상기 제1표층과 제2표층은,
고밀도폴리에틸렌(HDPE, High Density Polyethylene)과 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)이 50 중량% ~ 80 중량% : 20 중량% ~ 50 중량%로 혼합되어 이루어진 것을 특징으로 하는 방수시트용 무방향 다층무연신필름.A non-oriented multi-layer non-oriented film for waterproof sheet, wherein a core layer made of metallocene low density polyethylene (M.PE) is formed at the center,
A first surface layer formed by a multi-layer coextrusion air-cooling method and made by mixing high density polyethylene (HDPE) and metallocene low density polyethylene (M.PE) is formed on the core layer A second surface layer formed by mixing a high density polyethylene (HDPE) and a metallocene low density polyethylene (M.PE) is formed under the core layer,
Wherein the first surface layer and the second surface layer comprise
Characterized in that the film is made by mixing 50% by weight to 80% by weight: 20% by weight to 50% by weight of high density polyethylene (HDPE) and metallocene low density polyethylene (M.PE) Non-oriented multi-layered lead-free film for sheets. 제1항에 있어서,
상기 고밀도폴리에틸렌(HDPE, High Density Polyethylene)은,
밀도가 0.95 g/㎤ 이상, 용융점은 125℃ 이상, 파단점 응력 320 ㎏/㎠ 이상, 파단신율 500% 이상, VICAT 연화점 74℃ 이상인 물성을 가지며,
상기 메탈로센 저밀도폴리에틸렌(M.PE, Metallocene Low Density Polyethylene)은,
밀도가 0.92 g/㎤ 미만, 용융점은 116℃ 이상, 인장강도(MD/TD)가 580/460 ㎏/㎠ 이상, 인열강도(MD/TD) 124/127 ㎏/㎠ 이상, 신율(MD/TD) 580/620% 이상, VICAT 연화점 74℃ 이상인 물성을 가지는 것을 특징으로 하는 방수시트용 무방향 다층무연신필름.The method according to claim 1,
The high density polyethylene (HDPE)
Having a density of at least 0.95 g / cm 3, a melting point of at least 125 ° C, a breaking point stress of at least 320 kg / cm 2, a elongation at break of at least 500%, a VICAT softening point of 74 ° C or higher,
The metallocene low density polyethylene (M.PE)
(MD / TD) of 124/127 kg / cm < 2 > or more and elongation (MD / TD) of not less than 0.92 g / cm < 3 >, melting point of not less than 116 DEG C, tensile strength (MD / TD) of not less than 580/460 kg / TD) of 580/620% or more and VICAT softening point of 74 占 폚 or higher. 삭제delete 삭제delete 삭제delete
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KR102286459B1 (en) 2020-11-26 2021-08-05 주식회사 유상 Easy openable cpp film and food package containing the same

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KR102306914B1 (en) * 2019-07-24 2021-09-29 비엘티 주식회사 Film for Waterproof Sheet
KR102568834B1 (en) * 2021-07-26 2023-08-22 홍성민 A printing method of waste bag enhanced bond strength of ink

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KR100843033B1 (en) * 2001-02-27 2008-07-01 크라이오백 인코포레이티드 Low shrink tension film
KR100968714B1 (en) * 2009-11-27 2010-07-06 이상홍 Cohesive and adhesive type multi-plate complex waterproof sheet and its construction method

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KR100843033B1 (en) * 2001-02-27 2008-07-01 크라이오백 인코포레이티드 Low shrink tension film
KR100968714B1 (en) * 2009-11-27 2010-07-06 이상홍 Cohesive and adhesive type multi-plate complex waterproof sheet and its construction method

Cited By (1)

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Publication number Priority date Publication date Assignee Title
KR102286459B1 (en) 2020-11-26 2021-08-05 주식회사 유상 Easy openable cpp film and food package containing the same

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