KR20060047216A - Shrink film - Google Patents

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KR20060047216A
KR20060047216A KR1020050032276A KR20050032276A KR20060047216A KR 20060047216 A KR20060047216 A KR 20060047216A KR 1020050032276 A KR1020050032276 A KR 1020050032276A KR 20050032276 A KR20050032276 A KR 20050032276A KR 20060047216 A KR20060047216 A KR 20060047216A
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tinuvin
shrink film
film
sunscreen
weight
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임춘삼
정호열
정남순
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정남순
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    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/34Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
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    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions 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
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    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions 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
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    • C08J2323/02Characterised 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
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    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised 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
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    • C08L2203/00Applications
    • C08L2203/16Applications used for films
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00Properties characterising the ingredient of the composition
    • C08L2207/06Properties of polyethylene
    • C08L2207/066LDPE (radical process)

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Abstract

본 발명은, 수축필름에 관한 것으로서, 폴리에틸렌, 폴리프로필렌, 나일론으로 이루어진 군 중에서 선택되는 적어도 하나를 포함하는 베이스 수지와, 0.01 내지 2중량%의 2(3′,5′-디-t-부틸-2′-하이드록시페닐)-5-클로로벤조트리아졸을 포함하는 것을 특징으로 한다. 이에 의해 자외선 차단 효과가 우수한 수축필름이 제공된다.The present invention relates to a shrink film, comprising a base resin comprising at least one selected from the group consisting of polyethylene, polypropylene, and nylon, and 0.01 to 2% by weight of 2 (3 ′, 5′-di-t-butyl -2'-hydroxyphenyl) -5-chlorobenzotriazole. As a result, a shrink film having excellent UV blocking effect is provided.

Description

수축필름{SHRINK FILM}Shrink Film {SHRINK FILM}

본 발명은, 수축필름에 관한 것으로서, 보다 상세하게는, 소량 첨가로도 우수한 자외선 차단효과를 나타내는 자외선 차단제를 포함한 수축필름에 관한 것이다.The present invention relates to a shrink film, and more particularly, to a shrink film including a sunscreen agent exhibiting an excellent sunscreen effect even with a small amount of addition.

최근, 음료수의 포장에 PET용기가 많이 사용된다. 음료수 용기로 PET재질의 용기가 많이 사용되는 이유는 강도와 투명성이 좋고 표면에의 인쇄성이 우수하기 때문이다. Recently, PET containers are often used for the packaging of beverages. PET containers are often used as beverage containers because they have high strength and transparency and good printability on the surface.

공장에서 생산된 음료수는 PET용기에 봉입된 후, 상부가 개방된 종이나 플라스틱 박스 속에 다수개씩 포장된다. 종이박스의 개방된 상부는 통상 저밀도 폴리에틸렌(LDPE)으로 된 수축필름으로 덮어 씌어 포장한 후 운송하여 각 판매상에게 공급된다. The beverages produced at the factory are encapsulated in PET containers and then packaged in large quantities in paper or plastic boxes with the top open. The open top of the paper box is usually covered with a shrink film of low density polyethylene (LDPE), packaged, transported and supplied to each dealer.

그러나 PET용기의 경우 알루미늄 등의 금속캔과 달리 햇빛을 쬐면, 자외선이 투명한 용기 벽을 투과하여 음료의 색깔이나 향이 변하게 될 우려가 있다. 또한 여러 단계의 중간상인을 거치게 되면서 박스의 운송이 이루어지기 때문에 불가피하게 박스를 야적하게 되는 경우도 있게 되어 자외선 노출문제가 심각해진다. 특히 과일 쥬스의 경우 자외선에 의해 변질될 우려가 크므로 주의하여야 한다. However, in the case of PET containers, unlike metal cans such as aluminum, when sunlight is exposed, ultraviolet rays penetrate the transparent container walls, which may change the color or aroma of the beverage. In addition, as the transportation of the box is carried out through several stages of intermediaries, the box is inevitably piled up, which causes serious UV exposure problems. In particular, fruit juices are susceptible to deterioration by ultraviolet light, so be careful.

자외선은 397nm 내지 10nm의 파장을 가지는데, 이 중 음식류 또는 음료수의 맛을 변질시키는 파장은 대략 360nm 내지 380nm이다.Ultraviolet rays have a wavelength of 397 nm to 10 nm, of which the wavelength of altering the taste of food or drink is approximately 360 nm to 380 nm.

이와 같은 문제를 해결하기 위하여, 수축필름에 자외선 차단 기능을 부여하려는 노력이 많이 있어 왔다. 그 중에서 수축필름에 자외선 차단제를 첨가하는 방법이 많이 연구되어 왔다. 그러나 기존에 수축필름에 적용되었던 무기계 자외선 차단제는 수축필름의 투명도를 현저하게 저하시키며, 첨가제가 시간이 흐를수록 빠져나가는 백화 현상이 발생하는 문제가 있다. 또한 유기계 자외선 차단제는 마이그레이션(migration)이 발생하거나 원하는 자외선 차단 효과를 얻기 위해서는 비교적 많은 양이 첨가되어야 하는 문제가 있다.In order to solve this problem, there have been a lot of efforts to give a UV blocking function to the shrink film. Among them, a method of adding a sunscreen to a shrink film has been studied a lot. However, the inorganic sunscreen, which has been conventionally applied to the shrink film, significantly reduces the transparency of the shrink film, and there is a problem in that the whitening phenomenon that the additive is released over time occurs. In addition, the organic sunscreen has a problem that a relatively large amount should be added in order to generate migration or to obtain a desired sunscreen effect.

따라서 본 발명의 목적은, 첨가량 대비 효과가 우수한 자외선 차단제를 포함하는 수축필름을 제공하는 것이다.Therefore, it is an object of the present invention to provide a shrink film comprising a sunscreen excellent effect compared to the amount added.

상기 목적은, 본 발명에 따라, 수축필름에 있어서, 폴리에틸렌, 폴리프로필렌, 나일론으로 이루어진 군 중에서 선택되는 적어도 하나를 포함하는 베이스 수지와, 0.01 내지 2중량%의 2(3',5'-디-t-부틸-2'-하이드록시페닐)-5-클로로벤조트리아졸을 포함하는 것에 의하여 달성된다.The object is, according to the invention, in the shrink film, a base resin comprising at least one selected from the group consisting of polyethylene, polypropylene, nylon, and 0.01 to 2% by weight of 2 (3 ', 5'-di -t-butyl-2'-hydroxyphenyl) -5-chlorobenzotriazole.

수축필름은 실리카(SiO2)를 더 포함하는 것이 바람직하며, 실리카(SiO2)의 함량은 0.5 내지 10중량%인 것이 좋다.Shrink film is preferably further comprises silica (SiO 2), the content of silica (SiO 2) is preferably from 0.5 to 10% by weight.

상기 베이스 필름은 선형 폴리에틸렌(LDPE)과 저밀도 선형폴리에틸렌(LLDPE)을 포함하여 이루어진 것이 바람직하다.The base film is preferably made of linear polyethylene (LDPE) and low density linear polyethylene (LLDPE).

상기 목적은, 본발명에 따라, 수축필름에 있어서, 폴리에틸렌, 폴리프로필렌, 나일론으로 이루어진 군 중에서 선택되는 적어도 하나를 포함하는 베이스 수지와; 0.01 내지 2중량%의 2(3′-t-부틸-2′-하이드록시-5-메틸페닐)-5-클로로벤조트리아졸과; 0.5 내지 10중량%의 실리카를 포함하는 것에 의하여도 달성될 수 있다.The above object, according to the present invention, in the shrink film, a base resin comprising at least one selected from the group consisting of polyethylene, polypropylene, nylon; 0.01-2% by weight of 2 (3'-t-butyl-2'-hydroxy-5-methylphenyl) -5-chlorobenzotriazole; It can also be achieved by including 0.5 to 10 weight percent silica.

수축필름은 수지를 가열 연신하여 배향필름을 제조하고 연화점 이상의 온도로 재가열하여 수지필름에 내재하는 응력을 완화시킨 것으로, 필름의 수축특성을 이용하여 물품을 견고하게 포장하는데 사용된다.Shrink films are heat-stretched resin to produce an orientation film and reheated to a temperature above the softening point to relieve the stress inherent in the resin film, it is used to firmly package the article using the shrinkage characteristics of the film.

수축필름을 제조하는 방법은 통상 다음과 같다. The method for producing a shrink film is usually as follows.

베이스 수지로서 용융지수(melt index)가 0.3 내지 1사이의 저밀도 폴리에틸렌(LDPE)의 제품을 사용하여 블로운 타입(blown type)의 압출기를 이용하여 제품을 제조한다. 가공조건을 보면 가공온도는 150 내지 160℃, 필름팽창비(blow up ratio, BUR)는 1.2 내지 3이다. 필름두께는 50 내지 120㎛로 조절한다. 필름 가공시 결빙선 및 뽑힘성(draw down ratio, DDR)을 적절히 조정하여 고객이 요구하는 수축율을 맞춘다.The product is manufactured using a blown type extruder using a product of low density polyethylene (LDPE) having a melt index of 0.3 to 1 as the base resin. In terms of processing conditions, the processing temperature is 150 to 160 ° C, and the blow up ratio (BUR) is 1.2 to 3. The film thickness is adjusted to 50-120 micrometers. Adequately adjust the freezing line and draw down ratio (DDR) during film processing to match the shrinkage required by the customer.

수축필름에 있어 수축율은 매우 중요한 물성인데, 가로방향 수축율(TD)은 통상 필름팽창비에 의존하고 세로방향 수축율(MD)은 통상 뽑힘성에 의존한다. 이 밖에 수축율에 영향을 미치는 인자는 용융지수, 밀도, 성형온도, 권취속도, 결빙선 높이, 스크류 속도 등이다.Shrinkage is a very important property for shrink films, where the transverse shrinkage (TD) usually depends on the film expansion ratio and the longitudinal shrinkage (MD) usually depends on the drawability. Other factors affecting the shrinkage rate are melt index, density, forming temperature, winding speed, freezing line height and screw speed.

본 발명에서 사용된 자외선 차단제는 시바-가이기사의 TINUVIN 327, TINUVIN 326 그리고 실리카(SiO2)이다.The sunscreens used in the present invention are TINUVIN 327, TINUVIN 326 and silica (SiO 2 ) from Ciba-Geigy.

TINUVIN 327의 명칭은 2(3′,5′-디-t-부틸-2′-하이드록시페닐)-5-클로로벤조트리아졸이며 구조식은 다음과 같다.TINUVIN 327 is named 2 (3 ′, 5′-di-t-butyl-2′-hydroxyphenyl) -5-chlorobenzotriazole, and the structural formula is as follows.

- 구조식 --Structural formula-

Figure 112005020243505-PAT00001
Figure 112005020243505-PAT00001

CAS NO.는 3864-99-1이며 분자량은 357.9이다. 외관은 분말형태이며 노란색을 띠고 있다. TINUVIN 327은 열안정성이 좋고, 휘발도가 낮으며 광안정성이 우수하다.CAS NO. Is 3864-99-1 and molecular weight is 357.9. Appearance is powdery and yellow. TINUVIN 327 has good thermal stability, low volatility and excellent light stability.

TINUVIN 327의 사용량은 수축필름에 있어서, 0.01 내지 2중량%인 것이 바람직하다. The amount of TINUVIN 327 is preferably 0.01 to 2% by weight in the shrink film.

TINUVIN 327이 0.01 내지 0.2 중량%로 첨가될 경우, TINUVIN 327만으로는 자외선 차단 효과가 불충분할 수 있는데 이는 다른 자외선 첨가제를 첨가하여 보상할 수 있다. 소량이지만 자외선 차단 성능이 우수한 TINUVIN 327이 첨가되어 있기 때문에, 다른 자외선 첨가제의 사용량을 줄일 수 있게 된다.When TINUVIN 327 is added in an amount of 0.01 to 0.2% by weight, TINUVIN 327 alone may not be sufficient for the sunscreen effect, which can be compensated by adding other ultraviolet additives. A small amount of TINUVIN 327, which is excellent in UV protection, is added to reduce the use of other UV additives.

더욱 바람직하게는 TINUVIN 327이 0.3 내지 2중량%로 사용되는 것이 좋으며, TINUVIN 327만으로 충분한 자외선 차단효과를 얻으려면 0.4 내지 2중량%로 사용되 는 것이 바람직하다.More preferably, TINUVIN 327 is preferably used at 0.3 to 2% by weight, and in order to obtain sufficient UV blocking effect with TINUVIN 327 alone, it is preferable to use 0.4 to 2% by weight.

TINUVIN 327이 2중량%이상 사용되면, 자외선 차단효과의 개선은 미미한 반면 원가부담이 증가하여 바람직하지 않다.If TINUVIN 327 is used in an amount of 2% by weight or more, the improvement of the sunscreen effect is insignificant, but the cost burden is increased, which is undesirable.

TINUVIN 327은 실리카와 같이 사용될 수 있는데, 실리카의 사용량은 0.5 내지 10중량%이다.TINUVIN 327 can be used together with silica, wherein the amount of silica used is from 0.5 to 10% by weight.

TINUVIN 326의 명칭은 2(3′-t-부틸-2′-하이드록시-5-메틸페닐)-5-클로로벤조트리아졸이며 구조식은 다음과 같다.TINUVIN 326 is named 2 (3'-t-butyl-2'-hydroxy-5-methylphenyl) -5-chlorobenzotriazole and the structural formula is as follows.

- 구조식 --Structural formula-

Figure 112005020243505-PAT00002
Figure 112005020243505-PAT00002

CAS NO.는 3896-11-5이며 분자량은 315.8이다. 외관은 분말형태이며 노란색을 띠고 있다. TINUVIN 326은 열안정성이 좋고, 휘발도가 낮으며 광안정성이 우수하다.CAS NO. Is 3896-11-5 and has a molecular weight of 315.8. Appearance is powdery and yellow. TINUVIN 326 has good thermal stability, low volatility and excellent light stability.

TINUVIN 326의 사용량은 수축필름에 있어서, 0.01 내지 2중량%인 것이 바람직하다. The amount of TINUVIN 326 is preferably 0.01 to 2% by weight in the shrink film.

TINUVIN 326은 실리카와 같이 사용될 수 있는데, 실리카의 사용량은 0.5 내지 10중량%이다.TINUVIN 326 can be used together with silica, wherein the amount of silica used is from 0.5 to 10% by weight.

본발명의 자외선 차단제가 첨가되는 베이스 수지는 통상 폴리에틸렌이며, 이에 폴리프로필렌, 나일론 등이 추가로 포함될 수 있다. 이외에 수축필름의 성능을 향상시키기 위한 산화방지제 등이 더 포함되기도 한다. 폴리에틸렌은 선형 폴리에틸렌과 저밀도 선형 폴리에틸렌의 혼합물인 것이 바람직하다.The base resin to which the sunscreen of the present invention is added is usually polyethylene, which may further include polypropylene, nylon, and the like. In addition, antioxidants may be further included to improve the performance of the shrink film. The polyethylene is preferably a mixture of linear polyethylene and low density linear polyethylene.

이하 실시예와 비교예를 통하여 본 발명을 상세히 설명하도록 한다.Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples.

<실험 1>Experiment 1

본 발명에 따른 TINUVIN 327과 기존의 자외선 차단제의 성능을 비교하였다. 필름의 두께는 100㎛로 균일하게 하였으며, 자외선 차단제의 첨가량은 모두 4000ppm으로 균일하게 하였다. The performance of the TINUVIN 327 according to the present invention and the conventional sunscreen were compared. The thickness of the film was uniform to 100 μm, and the amount of the sunscreen added was uniform to 4000 ppm.

사용된 베이스 수지는 현대석유화학의 저밀도 폴리에틸렌으로 그레이드는 BF105이다. 베이스 수지의 용융지수는 0.3이고 밀도는 0.922이다. 용융지수 측정은 ASTM D1238, 밀도 측정은 ASTM D1505를 따라 행하였다.The base resin used is modern petrochemical low density polyethylene, graded to BF105. The melt index of the base resin is 0.3 and the density is 0.922. Melt index measurement was performed according to ASTM D1238, density measurement according to ASTM D1505.

자외선 투과율 측정에는 일본 시마츠사의 UV-2100S를 사용하였다. UV-2100S manufactured by Shimadzu, Japan, was used for the ultraviolet ray transmittance measurement.

가공에 사용한 기기는 블로운 타입의 Φ50mm 압출기이고, 필름팽창비는 1.5, 뽑힘성은 6, 결빙선은 45cm였다.The apparatus used for the process was a blown-type Φ 50 mm extruder, the film expansion ratio was 1.5, the drawability was 6, and the freezing line was 45 cm.

비교예 2에 사용된 CY 531는 사이텍사의 제품이며, 정식명칭은 CYASORB UV 531으로 벤조페논계열의 물질이다.CY 531 used in Comparative Example 2 is a product of Cytec, whose official name is CYASORB UV 531, which is a benzophenone series material.

비교예 3에 사용된 CY 5411 역시 사이텍사의 제품이며, 정식명칭은 CYASORB UV 5411으로 벤조트리아졸계열의 물질이다.CY 5411 used in Comparative Example 3 is also a product of Cytec, and the official name is CYASORB UV 5411, which is a benzotriazole series material.

비교예 4에 사용된 TINUVIN P는 시바가이기사의 제품으로, 화학명은 2(2′-하이드록시-5′-메틸페닐)벤조트리아졸이다.TINUVIN P used in Comparative Example 4 is a product of Ciba-Geigy Co., Ltd., and its chemical name is 2 (2'-hydroxy-5'-methylphenyl) benzotriazole.

비교예 5에 사용된 LOWILIT 26은 2-(2′-하이드록시-3′-t-부틸페닐-5′-t-부 틸페닐)벤조트리아졸이다.LOWILIT 26 used in Comparative Example 5 is 2- (2'-hydroxy-3'-t-butylphenyl-5'-t-butylphenyl) benzotriazole.

다음 표 1에 서로 다른 자외선 차단제를 사용한 수축필름에 있어서, 자외선 파장에 따른 투과율을 나타내었다.In the following shrinkage film using different sunscreens in Table 1, the transmittance according to the ultraviolet wavelength is shown.

표 1. 자외선 차단제의 종류에 따른 자외선 투과율 (단위 : %)Table 1. UV transmittance by type of sunscreen (Unit:%)

Figure 112005020243505-PAT00003
Figure 112005020243505-PAT00003

표의 투과율 데이터에서 '-' 표시는 측정하지 않았음을 나타낸다.In the transmittance data of the table, the '-' mark indicates no measurement.

자외선 차단제를 첨가하지 않은 비교예 1을 보면, 자외선 투과율이 50%를 넘어 자외선 차단이 거의 이루어지지 않았다. In Comparative Example 1, in which the sunscreen was not added, the UV transmittance exceeded 50% and almost no UV blocking was achieved.

CY 531을 사용한 비교예 2의 경우, 자외선 차단제의 첨가에도 불구하고 자외선 투과율이 30%를 넘어 자외선 차단 효과가 크게 개선되지 않음을 알 수 있다.In the case of Comparative Example 2 using CY 531, it can be seen that despite the addition of the sunscreen, the ultraviolet ray transmittance exceeds 30% and the sunscreen effect is not significantly improved.

또한 CY5411을 사용한 비교예 3와 TINUVIN P를 사용한 비교예 4의 경우, 비교예 2에 비하여는 자외선 차단 성능이 개선되었으나 380nm에서 30%가 넘는 높은 자외선 투과율을 보이고 있다.In addition, in Comparative Example 3 using CY5411 and Comparative Example 4 using TINUVIN P, the UV blocking performance is improved compared to Comparative Example 2, but shows a high UV transmittance of more than 30% at 380nm.

반면 LOWILIT 26을 사용한 비교예 5는 자외선 투과율이 10% 내로 줄어들었음을 보여 준다.On the other hand, Comparative Example 5 using LOWILIT 26 shows that the UV transmittance was reduced to within 10%.

그러나 비교예 4의 자외선 투과율은 TINUVIN 327를 사용한 실시예 1에 비하면 매우 높은 수준임을 알 수 있다. 실시예 1을 보면 320 내지 380nm에서의 자외선 투과율이 1%이하로 낮은 값을 유지하고 있다. However, it can be seen that the UV transmittance of Comparative Example 4 is very high compared to Example 1 using TINUVIN 327. In Example 1, the UV transmittance at 320 to 380 nm is maintained at a low value of 1% or less.

이로부터 4000ppm의 동일량을 사용할 경우, TINUVIN 327을 사용한 실시예 1이 종래의 자외선 차단제를 사용한 비교예들에 비하여 월등한 자외선 차단효과를 가짐을 알 수 있다.From this, when using the same amount of 4000ppm, it can be seen that Example 1 using TINUVIN 327 has a superior UV blocking effect than the comparative examples using a conventional sunscreen.

관능적으로 각 첨가제의 마이그레이션 특성을 관찰한 결과 실시예 1이 다른 비교예에 비하여 마이그레이션 발생이 적음을 확인하였다.As a result of observing the migration characteristics of each additive, it was confirmed that Example 1 has less migration than other comparative examples.

<실험 2>Experiment 2

실험 1과 실험방법은 동일하다. 자외선 첨가제로는 TINUVIN 327만을 사용하였으며, 그 양을 1000ppm, 2000ppm, 4000ppm, 8000ppm으로 변경하면서 자외선 투과율을 측정하였다.Experiment 1 and the method are the same. Only TINUVIN 327 was used as the UV additive, and the UV transmittance was measured while changing the amount to 1000 ppm, 2000 ppm, 4000 ppm, and 8000 ppm.

표 2에 그 결과를 나타내었다.Table 2 shows the results.

표 2. TINUVIN 327의 첨가량에 따른 자외선 투과율 (단위 : %)Table 2. UV transmittance according to the amount of TINUVIN 327 added (unit:%)

Figure 112005020243505-PAT00004
Figure 112005020243505-PAT00004

표 2를 보면 TINUVIN 327을 각각 1000ppm과 2000ppm을 사용한 실시예 2와 실 시예 3의 자외선 차단효과가, 4000ppm을 사용한 실시예 1에 비하여 불량함을 알 수 있다. 그러나 실시예 2와 실시예 3에서 값은 다른 자외선 차단제를 4000ppm 사용한 비교예 2 내지 4와 유사한 수준이다. 즉 TINUVIN 327은 적은 양으로도 우수한 자외선 차단 효과를 나타내는 것이다.Looking at Table 2, it can be seen that the UV blocking effect of Example 2 and Example 3 using 1000 ppm and 2000 ppm of TINUVIN 327, respectively, is worse than that of Example 1 using 4000 ppm. However, the values in Examples 2 and 3 are similar to those of Comparative Examples 2 to 4 using 4000 ppm of other sunscreens. In other words, TINUVIN 327 exhibits excellent UV protection even in small amounts.

따라서 TINUVIN 327을 소량 사용하면, 원하는 자외선 차단 효과를 얻기 위한 다른 자외선 차단제의 사용량을 크게 줄일 수 있다.Therefore, using a small amount of TINUVIN 327 can significantly reduce the amount of other sunscreens used to achieve the desired sunscreen effect.

TINUVIN 327을 8000ppm사용한 실시예 4와 4000ppm사용한 실시예 1을 비교하면, TINUVIN 327의 증가에 따라 자외선 차단 성능이 크게 개선되지는 않음을 알 수 있다.Comparing Example 4 using 8000 ppm of TINUVIN 327 with Example 1 using 4000 ppm, it can be seen that the UV blocking performance is not significantly improved as the TINUVIN 327 is increased.

<실험 3>Experiment 3

실험 1과 실험방법은 동일하다. 자외선 첨가제로는 TINUVIN 327을 4000ppm사용하였으며, 필름두께를 80㎛와 100㎛로 달리하여 자외선 투과율을 측정하였다. Experiment 1 and the method are the same. 4000 ppm of TINUVIN 327 was used as the ultraviolet additive, and the UV transmittance was measured by varying the film thickness at 80 μm and 100 μm.

표 3에 그 결과를 나타내었다.Table 3 shows the results.

표 3. 필름 두께에 따른 자외선 투과율 (단위 : %)Table 3. UV transmittance according to film thickness (unit:%)

Figure 112005020243505-PAT00005
Figure 112005020243505-PAT00005

표 3을 보면 필름 두께를 줄여도 자외선 투과율은 크게 증가하지 않음을 알 수 있다. 따라서 TINUVIN 327을 자외선 차단제로 사용할 경우, 필름 두께를 줄일 수 있어 원가를 절감할 수 있다. Looking at Table 3, it can be seen that the UV transmittance does not increase significantly even if the film thickness is reduced. Therefore, when using TINUVIN 327 as a sunscreen, the film thickness can be reduced, thereby reducing the cost.

<실험 4>Experiment 4

실험 1과 실험방법은 동일하다. 단, 베이스 필름으로는 선형 폴리에틸렌인 BF115와 저밀도 선형 폴리에틸렌인 현대석유화학의 UN314를 50%씩 블렌드하여 사용하였다. 자외선 차단제로는 TINUVIN 327과 TINUVIN 326에 실리카를 추가하였다. Experiment 1 and the method are the same. However, as a base film, BF115 which is a linear polyethylene and UN314 of Hyundai Petrochemical which is a low density linear polyethylene were used by blending 50% each. As sunscreen, silica was added to TINUVIN 327 and TINUVIN 326.

표 4에 그 결과를 나타내었다.Table 4 shows the results.

표 4. 실리카 추가에 따른 자외선 투과율 (단위 : %)Table 4. UV transmittance with addition of silica (unit:%)

Figure 112005020243505-PAT00006
Figure 112005020243505-PAT00006

표 4의 비교예 6과 실시예 6을 비교하면 TINUVIN 327에 의한 자외선 투과율 감소를 확인할 수 있다. 실시예 7 내지 9는 TINUVIN 327 3500ppm에 실리카를 각각 10000ppm, 30000ppm, 50000ppm 추가한 것인데, 실리카 추가에 의한 자외선 투과율 감소를 알 수 있다. TINUVIN 326 3500ppm에 실리카를 50000ppm 추가한 실시예 10에 서도 자외선 투과율 감소를 확인할 수 있다. 이로부터 TINUVIN 327 또는 TINUVIN 326과 함께 실리카를 사용하면 자외선 투과율을 감소시킬 수 있음을 알 수 있다. 또한 자외선 차단제로 실리카를 추가하면 TINUVIN 327과 TINUVIN 326의 사용량도 감소시킬 수 있다.Comparing Comparative Example 6 and Example 6 of Table 4 it can be confirmed that the UV transmittance decrease by TINUVIN 327. In Examples 7 to 9, 10000ppm, 30000ppm and 50000ppm of silica were added to 3500ppm of TINUVIN 327, respectively. In Example 10, where 50000 ppm of silica was added to 3500 ppm of TINUVIN 326, a decrease in UV transmittance was also confirmed. From this it can be seen that the use of silica in combination with TINUVIN 327 or TINUVIN 326 can reduce the UV transmittance. The addition of silica as a sunscreen can also reduce the use of TINUVIN 327 and TINUVIN 326.

이상 설명한 바와 같이, 본 발명에 따르면, 첨가량 대비 효과가 우수한 자외선 차단제를 포함하는 수축필름이 제공된다. 이에 따라 음료용기 등을 자외선 노출 우려 없이 보관, 운송할 수 있다. 또한 수축필름의 두께를 줄일 수 있어 원가절감이 가능하다.As described above, according to the present invention, there is provided a shrink film including a sunscreen excellent in the addition amount effect. Accordingly, beverage containers and the like can be stored and transported without fear of ultraviolet exposure. In addition, it is possible to reduce the thickness of the shrink film to reduce the cost.

Claims (5)

수축필름에 있어서,In shrink film, 폴리에틸렌, 폴리프로필렌, 나일론으로 이루어진 군 중에서 선택되는 적어도 하나를 포함하는 베이스 수지와;A base resin comprising at least one selected from the group consisting of polyethylene, polypropylene, and nylon; 0.01 내지 2중량%의 2(3′,5′-디-t-부틸-2′-하이드록시페닐)-5-클로로벤조트리아졸을 포함하는 것을 특징으로 하는 수축필름.A shrink film comprising 0.01 to 2% by weight of 2 (3 ', 5'-di-t-butyl-2'-hydroxyphenyl) -5-chlorobenzotriazole. 제1항에 있어서,The method of claim 1, 실리카(SiO2)를 더 포함하는 것을 특징으로 하는 수축필름.Shrink film, characterized in that it further comprises silica (SiO 2 ). 제1항에 있어서,The method of claim 1, 상기 실리카(SiO2)의 함량은 0.5 내지 10중량%인 것을 특징으로 하는 수축필름.Shrink film, characterized in that the content of silica (SiO 2 ) is 0.5 to 10% by weight. 제1항에 있어서,The method of claim 1, 상기 베이스 필름은 선형 폴리에틸렌과 저밀도 선형폴리에틸렌을 포함하여 이루어진 것을 특징으로 하는 수축필름.The base film is a shrink film, characterized in that consisting of linear polyethylene and low density linear polyethylene. 수축필름에 있어서,In shrink film, 폴리에틸렌, 폴리프로필렌, 나일론으로 이루어진 군 중에서 선택되는 적어도 하나를 포함하는 베이스 수지와;A base resin comprising at least one selected from the group consisting of polyethylene, polypropylene, and nylon; 0.01 내지 2중량%의 2(3′-t-부틸-2′-하이드록시-5-메틸페닐)-5-클로로벤조트리아졸과;0.01-2% by weight of 2 (3'-t-butyl-2'-hydroxy-5-methylphenyl) -5-chlorobenzotriazole; 0.5 내지 10중량%의 실리카를 포함하는 것을 특징으로 하는 수축필름. Shrink film, characterized in that it comprises 0.5 to 10% by weight of silica.
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