KR20220041275A - Five layer heat insulation sheet for vinyl house - Google Patents

Abstract

The present invention relates to a five-layer heat insulation sheet for a plastic greenhouse which includes an upper layer (10), a first intermediate layer (20), a third intermediate layer (40), a second intermediate layer (30) inserted between the first intermediate layer (20) and the third intermediate layer (40), and a lower layer (50). The upper layer (10) and the second intermediate layer include a composition including 40 to 60 wt% of linear low density polyethylene (LLDPE), 20 to 40 wt% of low density polyethylene (LDPE), and 10 to 30 wt% of ethylene vinyl acetate (EVA). The first intermediate layer (20) and the third intermediate layer (40) include a composition including 10 to 30 wt% of linear low density polyethylene (LLDPE), 10 to 30 wt% of low density polyethylene (LDPE), and 50 to 70 wt% of ethylene vinyl acetate (EVA). The lower layer (50) includes a composition including 20 to 40 wt% of linear low density polyethylene (LLDPE), 40 to 60 wt% of low density polyethylene (LDPE), and 10 to 30 wt% of ethylene vinyl acetate (EVA). The upper layer (10) and the second intermediate layer (30) further include an ultraviolet (UV) absorbing and blocking agent. The lower layer (50) further includes an ultraviolet (UV) absorbing and blocking agent and an antifogging agent. The lower layer (50) further includes a methyl etherified melamine resin having a methoxy group. According to the present invention, excellent initial antifogging properties and excellent durability of the antifogging properties can be ensured.

Description

5-layer insulation sheet for plastic house {FIVE LAYER HEAT INSULATION SHEET FOR VINYL HOUSE}

The present invention relates to a five-layer insulating sheet for a plastic house having excellent anti-fogging properties and excellent heat-sealing adhesive strength while maintaining excellent thermal insulation properties.

The insulation sheet for a plastic house has functions such as light transmission, heat retention, and weather resistance, thereby protecting crops from changes in the external environment of the plastic house and stably producing high-quality, high-income agricultural products. In general, an insulating sheet for a plastic house including an air cap is a type of film containing bubbles, originally named for a product of Sealed Air Corporation of the United States, but recently it is used as a pronoun for a film containing bubbles. The general structure of the insulating sheet for a plastic house is that two sheets of polyethylene film are superimposed on top of each other and air bubbles are trapped between them. These polyethylene film-based insulation sheets for plastic houses have a smaller density than vinyl chloride resin, so they are lighter, produce less toxic gas even when incinerated, and require adhesive processing for width joints by inflation molding. It is being actively used because it is possible to provide a wide film that is not used at low cost. That is, the insulating sheet for a plastic house can provide a thermal insulation effect that can maintain a constant temperature required for crops grown in the plastic house due to excellent thermal insulation properties.

However, the inner surface of the insulating sheet for a plastic house is blocked from the outside, and water droplets may form due to a temperature difference with the outside. As such, the water droplets formed on the inner surface of the insulation sheet for a plastic house may damage the agricultural products inside the plastic house or reduce the light transmittance of the plastic house, thereby inhibiting the growth of agricultural products.

Accordingly, in Korean Patent Registration No. 10-1048833 and Korean Patent Application No. 10-2014-7035787, the inner film surface of the house is coated with an anti-fogging agent to provide long-term anti-fogging properties. However, although such an antifogging agent coating type is excellent in the durability of antifogging property, it takes time for expression of antifogging property, and there existed a problem that the initial stage antifogging property immediately after the film was mounted in a house was inferior.

In addition, since the insulation sheet for a plastic house is manufactured to have a long length and a standardized width, when installed in a plastic house, in a state in which a part is overlapped in the longitudinal direction, the overlapping part is jointed with an adhesive, and then the plastic house is completely closed. installed to cover. However, there is a problem in that the overlapping portion of the insulating sheet installed in the conventional plastic house is easily dropped according to the temperature change according to the season. That is, the adhesive bonding the overlapping portion of the insulating sheet is easily lost under the influence of the temperature repeatedly changed by seasons, so there is a problem that it is impossible to maintain a strong adhesive force to the overlapping portion.

In addition, since the multilayer structure including the film containing air bubbles must be heat-sealed even when the insulation sheet for a plastic house is attached by heat sealing, the strength of the overlapping area after heat sealing or the thermal insulation property is deteriorated. there was.

Republic of Korea Patent No. 10-1048833 Republic of Korea Patent Publication No. 10-2015-0035719 Republic of Korea Patent Publication No. 10-2013-0072230 Republic of Korea Patent Publication No. 10-2015-0078553 Republic of Korea Patent Publication No. 10-2015-0087726

One embodiment of the present invention has excellent initial anti-fogging properties and anti-fogging properties, and is excellent in heat sealing adhesive strength while maintaining excellent thermal insulation properties when stacking and bonding several standardized insulation sheets for plastic houses. It is to provide a 5-layer insulation sheet.

One embodiment of the present invention is a vinyl comprising an upper layer facing the outside of the plastic house, a first intermediate layer and a third intermediate layer in which a plurality of air caps are formed, and a second intermediate layer therebetween, a lower layer facing the inside of the plastic house In the insulation sheet for a house, the upper layer and the second intermediate layer include 40 to 60% by weight of linear low-density polyethylene (LLDPE), 20 to 40% by weight of low-density polyethylene (LDPE), and 10 to 30% by weight of ethylene vinyl acetate (EVA) and a sheet composition for an upper layer and a second intermediate layer, wherein the first intermediate layer and the third intermediate layer are linear low density polyethylene (LLDPE) 10 to 30% by weight, low density polyethylene (LDPE) 10 to 30% by weight and ethylene vinyl acetate ( EVA) 50 to 70% by weight of the sheet composition for the first and third interlayers, and the lower layer is 20 to 40% by weight of linear low density polyethylene (LLDPE), 40 to 60% by weight of low density polyethylene (LDPE) % and a sheet composition for the lower layer (3) comprising 10 to 30 wt% of ethylene vinyl acetate (EVA), wherein the upper layer and the second intermediate layer are based on 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, 1 to 15 parts by weight of an ultraviolet (UV) absorbing and blocking agent, wherein the lower layer further comprises 1 to 15 parts by weight of an ultraviolet (UV) absorbing and blocking agent and 1 to 15 parts by weight of an antifogging agent based on 100 parts by weight of the sheet composition for the lower layer It provides an insulating sheet for a plastic house that includes.

The antifogging agent is a mixture of C8 to C18 alkyl sulfoacetate, sorbitan fatty acid ester, and glycerin fatty acid ester in a weight ratio of 1: 2: 2; The lower layer may further include 5 to 20 parts by weight of a methyl etherified melamine resin having a methoxy group based on 100 parts by weight of the sheet composition for the lower layer.

The linear low-density polyethylene (LLDPE) included in the upper layer and the second intermediate layer, the first intermediate layer and the third intermediate layer, and the lower layer 3 has a melt index of 0.1 to 1.7 g/10 min, and a density of 0.920 to 0.936 g/cm 3 will; The upper layer and the second intermediate layer, the first intermediate layer and the third intermediate layer, and the low-density polyethylene (LDPE) included in the lower layer 3 have a melt index of 0.5 to 2.0 g/10 min, and a density of 0.920 to 0.928 g/cm 3 ; The low-density polyethylene (LDPE) contained in the upper layer and the second intermediate layer and the lower layer has a melt index of 0.5 to 2.0 g/10 min, and a density of 0.920 to 0.928 g/cm 3 of metallocene linear low-density polyethylene (mLLDPE) of 0.1 to 20 % by weight; Ethylene vinyl acetate (EVA) included in the upper layer, the second intermediate layer, and the lower layer has a vinyl acetate content of 0.1 to 25% by weight; Ethylene vinyl acetate (EVA) included in the first intermediate layer and the third intermediate layer may be used in an amount of 30 to 50 wt % of vinyl acetate.

One surface of the upper layer facing the first intermediate layer and one surface of the lower layer facing the third intermediate layer are foamed to include micropores, and the thickness ratio of the upper layer and the second intermediate layer, the first intermediate layer and the third intermediate layer, and the lower layer is 2 It could be 1:1:2.

The upper layer and the second intermediate layer are to further include 5 to 20 parts by weight of a melamine resin and 0.1 to 2 parts by weight of a foaming agent, based on 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, and the lower layer is 100 parts by weight of the sheet composition for the lower layer Based on the part, it may further include 5 to 20 parts by weight of a methyl etherified melamine resin having a methoxy group and 0.1 to 2 parts by weight of a foaming agent.

In the insulating sheet for a plastic house according to an embodiment of the present invention, the insulating sheet for a plastic house itself contains an anti-fogging agent, and thus, the initial anti-fogging and anti-fogging properties are excellent. At the same time, when two or more heat-sealing sheets for a plastic house are heat-sealed, respectively, there is an effect of having excellent heat-sealing adhesive strength and maintaining excellent heat insulation properties. In particular, after bonding, the integrity of the bonding part is excellent, and not only the heat-sealing bonding strength is excellent, but also excellent thermal insulation properties can be maintained, so that it is possible to obtain a warming effect in winter and a cooling effect in summer .

1 is a perspective view of a five-layer insulating sheet for a plastic house according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 1 .
Figure 3 is a perspective view showing a state in which two insulation sheets for a plastic house are superimposed and fixed.
Figure 4 is a cross-sectional view of the insulating sheet for a plastic house according to another embodiment of the present invention having a foamed surface of the upper layer and a foamed surface of the lower layer.

Hereinafter, embodiments of the present invention will be described in detail. However, this is provided as an example, and the present invention is not limited thereto, and the present invention is only defined by the scope of the claims to be described later.

The present invention provides a first intermediate layer 20 and a third intermediate layer 40 in which the upper layer 10 facing the outside of the plastic house and the second intermediate layer 30 inserted in the middle, and a plurality of air caps 60 are formed. And, it relates to a five-layer insulating sheet for a plastic house including the lower layer 50 facing the inside of the plastic house.

Here, the five-layer heat insulating sheet for the plastic house is a combination of the upper layer 10, the first intermediate layer 20, the second intermediate layer 30, the third intermediate layer 40, and the lower layer 50 from top to bottom in that order. As a result, a 5-layer insulation sheet is formed.

In the insulation sheet for a plastic house according to an embodiment of the present invention, the upper layer 10 and the second intermediate layer 30 are 40 to 60% by weight of linear low-density polyethylene (LLDPE), 20 to 40% by weight of low-density polyethylene (LDPE) % and a sheet composition for an upper layer and a second intermediate layer containing 10 to 30 wt% of ethylene vinyl acetate (EVA), wherein the first intermediate layer 20 and the third intermediate layer 40 are linear low-density polyethylene (LLDPE) ) 10 to 30% by weight, 10 to 30% by weight of low density polyethylene (LDPE), and 50 to 70% by weight of ethylene vinyl acetate (EVA) to include a sheet composition for the first and third intermediate layers, the lower layer Reference numeral 50 denotes a sheet composition for a lower layer comprising 20 to 40% by weight of linear low density polyethylene (LLDPE), 40 to 60% by weight of low density polyethylene (LDPE), and 10 to 30% by weight of ethylene vinyl acetate (EVA).

In this case, the upper layer 10 and the second intermediate layer 20 further include 1 to 15 parts by weight of an ultraviolet (UV) absorption and blocking agent, based on 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, and the lower layer ( 50) is to further include 1 to 15 parts by weight of an ultraviolet (UV) absorbing and blocking agent and 1 to 15 parts by weight of an antifogging agent based on 100 parts by weight of the sheet composition for the lower layer.

A perspective view of the insulating sheet for a plastic house according to an embodiment of the present invention is as shown in FIG. 1 . Also, a cross-sectional view taken along line A-A shown in FIG. 1 is the same as shown in FIG. 2 .

The insulating sheet for a plastic house according to an embodiment of the present invention contains an antifogging agent in the lower layer 50 itself facing the inside of the plastic house, so that compared to the case of forming a separate antifogging layer in the prior art, the initial antifogging There is an effect that the durability of performance and anti-fogging properties is further improved. In addition, there is an effect that the initial anti-fogging properties and durability of anti-fogging properties are greatly improved compared to the case where the lower layer including only the conventional low-density polyethylene (LDPE) and ethylene vinyl acetate (EVA) contains an anti-fogging agent.

In particular, the antifogging agent is a mixture of C8 to C18 alkyl sulfoacetate, sorbitan fatty acid ester, and glycerin fatty acid ester in a weight ratio of 1: 2: 2; The lower layer 50 further comprises 5 to 20 parts by weight of a methyl etherified melamine resin having a methoxy group, based on 100 parts by weight of the sheet composition for the lower layer, so that the antifogging agent is very firmly distributed on the surface of the lower layer 50 . And, by fixing it, there is an effect that can further improve the effect of improving the durability of the initial anti-fogging properties and anti-fogging properties described above. In addition, even after thermal fusion of the sheet, the anti-fogging effect does not decrease in the region of the thermally fused sheet and is excellently maintained.

In addition, the five-layer insulating sheet for a plastic house according to an embodiment of the present invention has an effect of having excellent adhesive strength and maintaining excellent thermal insulation properties when two or more insulating sheets for a plastic house are heat-sealed, respectively. Therefore, there is a very useful advantage not only in the case of heat-sealing several standardized 5-layer insulation sheets for a plastic house, but also in the case of heat-sealing in order to repair or repair a hole in the sheet due to a physical impact. .

In addition, since the five-layer insulating sheet for a plastic house can be easily and firmly adhered by thermal fusion, it can be easily performed not only by a heating roller but also by hot air. In particular, there is an advantage that can be easily and firmly repaired using hot air in the case of thermal fusion in order to repair a hole in the sheet due to a physical impact.

In particular, the five-layer insulation sheet for a plastic house is manufactured by heat-sealing several heat-insulating sheets for a plastic house of standardized sizes, respectively, and the heat-sealing is a lower layer 50 and an upper layer ( 10) may be performed by overlapping and fixing the overlapping parts to face each other, then pressing and bonding the overlapping parts melted by hot air. At this time, the overlapping width of the overlapping portion has an effect of having excellent heat-sealing adhesive strength and maintaining excellent thermal insulation properties by overlapping and fixing in the range of 10 to 50 cm, and then bonding. A cross-sectional view of two such insulating sheets for a plastic house superimposed and fixed is shown in FIG. 3 . In this case, there is an effect of increasing the size and mass production of the insulating sheet for a plastic house. In addition, in this case, since the lower layer 50 containing the antifogging agent is bonded to face the inside of the plastic house, there is an effect of maintaining the excellent effect of the initial antifogging property and the durability of the antifogging property of the heat insulating sheet for a plastic house as it is.

More specifically, in the five-layer heat insulating sheet for a plastic house according to an embodiment of the present invention, the sheet composition for the upper layer and the second intermediate layer improves the heat shielding and weather resistance of the heat insulating sheet for a plastic house, and provides ultraviolet (UV) light. So that the compatibility and processability with the absorbent and blocking agent, and the heat sealing with the first intermediate layer 20 and the third intermediate layer 40 or the lower layer 50 of the five-layer insulating sheet to be attached can be easily and firmly performed, It is more preferable to include linear low density polyethylene (LLDPE), low density polyethylene (LDPE) and ethylene vinyl acetate (EVA) in a weight ratio of 50: 30: 20. At this time, the upper layer 10 and the second intermediate layer 30, based on 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, further comprising 1 to 15 parts by weight of an ultraviolet (UV) absorption and blocking agent, There is an effect that can further extend the service life of the 5-layer insulation sheet for a plastic house by suppressing the polymer decomposition.

In particular, the linear low-density polyethylene contained in the upper layer and the second intermediate layer sheet composition uses a linear low-density polyethylene (octene LLDPE) containing octene (octane number of 35% or more) to provide superior tensile strength to the insulating sheet for a plastic house. can be given

In addition, the sheet composition for the first intermediate layer and the third intermediate layer is a linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE) so that heat sealing can be performed more easily and strongly while giving air bubbles to the insulating sheet for a plastic house. And ethylene vinyl acetate (EVA) is more preferably included in a weight ratio of 20: 20: 60.

In addition, the sheet composition for the lower layer 50 improves the heat shielding and weather resistance of the insulating sheet for a plastic house, and compatibility with ultraviolet (UV) absorption and blocking agents, and antifogging agents, processability, and the third intermediate layer 40 Or, linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE) and ethylene vinyl acetate (EVA) are 30: 50: It is more preferable to include it in a weight ratio of 20. In this case, the lower layer 50 further comprises 1 to 15 parts by weight of an ultraviolet (UV) absorbing and blocking agent and 1 to 15 parts by weight of an antifogging agent, based on 100 parts by weight of the sheet composition for the lower layer, to prevent polymer decomposition by UV exposure It is possible to further extend the service life of the insulation sheet for a plastic house by suppressing it, preventing the dew point caused by the temperature difference inside and outside the agricultural film, preventing fogging, and improving the durability of initial anti-fogging and anti-fogging properties there is

More specifically, the linear low-density polyethylene (LLDPE) included in the upper layer 10 and the second intermediate layer 30, the first intermediate layer 20 and the third intermediate layer 40 and the lower layer 40 has a melt index of 0.1 to It is 1.7 g/10 min, and a density of 0.920 to 0.936 g/cm 3 is more preferably used, and the above-described effect can be further improved.

In addition, the low-density polyethylene (LDPE) included in the upper layer 10 and the second intermediate layer 30, the first intermediate layer 20 and the third intermediate layer 40 and the lower layer 40 has a melt index of 0.5 to 2.0 g/ It is 10 minutes, and a density of 0.920 to 0.928 g/cm 3 is more preferably used, and the above-described effect can be further improved.

In particular, the low-density polyethylene (LDPE) included in the lower layer 40 is 80 to 99.9 wt% of the low-density polyethylene (LDPE); Melt index of 0.5 to 2.0 g/10 min, and density of 0.920 to 0.928 g / ㎤ metallocene linear low density polyethylene (mLLDPE) containing 0.1 to 20% by weight is more preferably used, and the above effect can be further improved can be improved In addition, the metallocene linear low-density polyethylene (mLLDPE) is polymerized under the catalyst of metallocene, which is a metal converted to a cation sandwiched like a sandwich between cyclopentadienyl anions converted into anions. As an ethylene copolymer, it has high tensile strength and can provide the effect of easy extrusion.

In addition, the content of ethylene vinyl acetate (EVA) included in the upper layer 10, the second intermediate layer 30, and the lower layer 50 is 0.1 to 25 wt%; Ethylene vinyl acetate (EVA) included in the first intermediate layer 20 and the third intermediate layer 40 is more preferably used in an amount of 30 to 50 wt % of vinyl acetate, so that the above-described effect can be further improved. there is. In particular, there is an effect that can be more easily and firmly adhered by thermal fusion when overlapping and bonding the insulating sheets for a plastic house. In particular, after bonding, there is an advantage in that the integrity of the bonding portion is excellent.

The ultraviolet (UV) absorber and blocker are generally used in the art, and the type is not particularly limited, but more specifically, butylmethoxydibenzoylmethane, bis-ethylhexyloxyphenolmethoxyphenyltriazine and 2-( By using a mixture of 3'-allyl-2'-hydroxy-5'-methylphenyl)benzotriazole in a weight ratio of 2: 1: 1, the above-described effect can be further improved.

The antifogging agent is generally used in the art, and the type thereof is not particularly limited, but more specifically, a C8 to C18 alkyl sulfoacetate, a sorbitan fatty acid ester, and a glycerin fatty acid ester are mixed with a weight of 1: 2: 2 By using a mixture in a ratio, the above-described effect can be further improved.

The sheet composition for the upper layer and the second intermediate layer, the first intermediate layer and the third intermediate layer, and the lower layer sheet composition may further include additives commonly used in the art, respectively. These additives are not particularly limited, but, for example, antioxidants, slip agents, antiblocking agents, weathering agents, etc. may be used.

More specifically, the antioxidant is generally used in the art, and the type is not particularly limited, but more specifically, benzopropanoic acid is used to react with oxygen during sheet processing to oxidize and deteriorate By suppressing the reaction, there is an effect that can further extend the service life of the insulating sheet for a plastic house.

In addition, the slip agent is generally used in the art and the type thereof is not particularly limited, but more specifically, a mixture of fluor acrylate and stearamide in a weight ratio of 1: 1 is used, and the plastic house It is possible to further prevent the adhesion of foreign substances to the surface of the insulating sheet for use, and when two or more insulating sheets for a plastic house are overlapped, there is an effect that can facilitate their peeling.

In addition, the anti-blocking agent is generally used in the art, and the type thereof is not particularly limited, but more specifically, one or more inorganic particles selected from the group consisting of calcium carbonate, silicon dioxide, and mixtures thereof are stearic acid amide, By using a mixture of at least one organic material selected from the group consisting of ethylene bis stamide and a mixture thereof in a weight ratio of 1:2, excellent anti-blocking properties can be imparted.

In addition, the weathering agent is generally used in the art, and the type is not particularly limited, but more specifically, by using HALS (Hindered Amine Light Stabilizer), the weather resistance of the 5-layer insulation sheet for a plastic house can be further improved. can have an effect.

With respect to 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, the first intermediate layer, the third intermediate layer, and the lower layer, the additive is included in the range of 1 to 10 parts by weight, respectively, to further improve the above effect. can

In addition, one surface of the upper layer 10 facing the first intermediate layer 20 and one surface of the lower layer 50 facing the third intermediate layer 40 are foamed to include micropores 70, and the plastic house There is an effect that can further improve the thermal insulation properties of the thermal insulation sheet and the adhesive properties by thermal fusion. A cross-sectional view of the insulating sheet for a plastic house according to an embodiment of the present invention having a foamed surface of the upper layer 10 and a foamed surface of the lower layer 50 is as shown in FIG. 4 . At this time, the thickness ratio of the upper layer 10 and the second intermediate layer 30 having the same thickness, the first intermediate layer 20 and the third intermediate layer 40 and the lower layer 50 having the same thickness is 2:1:2, respectively. By using it, the above-mentioned effect can be further improved.

The upper layer 10 and the second intermediate layer 30 are to further include 5 to 20 parts by weight of a melamine resin and 0.1 to 2 parts by weight of a foaming agent, based on 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, and the lower layer (50) is, based on 100 parts by weight of the sheet composition for the lower layer, 5 to 20 parts by weight of a methyl etherified melamine resin having a methoxy group and 0.1 to 2 parts by weight of a foaming agent. ) can be easily produced, the above-described effect can be further improved. In particular, the methyl-etherified melamine resin having a methoxy group included in the lower layer 50 has the effect of providing excellent anti-fogging effect at the same time by firmly fixing the anti-fogging agent of the present invention as described above. In this case, at least one selected from the group consisting of butane, pentane, and mixtures thereof as the foaming agent may be preferably used.

In the insulating sheet for a plastic house according to an embodiment of the present invention, the five-layer insulating sheet for a plastic house itself contains an antifogging agent, and thus, the initial antifogging and antifogging properties are excellent. At the same time, when two or more 5-layer heat insulating sheets for a plastic house are heat-sealed, respectively, there is an effect of having excellent heat-sealing adhesive strength and maintaining excellent heat insulating properties. In particular, after bonding, the integrity of the bonding part is excellent, and not only the heat-sealing bonding strength is excellent, but also excellent thermal insulation properties can be maintained, so that it is possible to obtain a warming effect in winter and a cooling effect in summer .

Hereinafter, preferred examples and comparative examples of the present invention will be described. However, the following examples are only preferred examples of the present invention, and the present invention is not limited by the following examples.

<Example 1>

The first in which the upper layer 10 facing the outside of the plastic house, the second intermediate layer 30 that is inserted between and joined between the first intermediate layer 20 and the third intermediate layer 40, and a plurality of air caps 60 are formed. A five-layer insulating sheet for a plastic house including an intermediate layer 20 and a third intermediate layer 40, and a lower layer 50 facing the inside of the plastic house was manufactured.

The sheet composition for the upper layer and the second intermediate layer has a melt index of about 0.5 g/10 min, and a density of 0.932 g/cm 3 linear low density polyethylene (LLDPE); low density polyethylene (LDPE) having a melt index of about 1.8 g/10 min and a density of 0.925 g/cm 3 ; and ethylene vinyl acetate (EVA) having a vinyl acetate content of 20% by weight in a weight ratio of 50: 30: 20, with respect to 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, ultraviolet (UV) light Those containing 12 parts by weight of an absorbent and blocking agent were used. In this case, the ultraviolet (UV) absorption and blocking agents are butylmethoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyltriazine and 2-(3'-allyl-2'-hydroxy-5'-methylphenyl)benzotria A mixture of the sol in a weight ratio of 2: 1: 1 was used.

In addition, the first and third intermediate layer sheet compositions have a melt index of 0.1 to 1.7 g/10 min, and a linear low-density polyester having a density of 0.920 to 0.936 g/cm 3 The melt index is about 0.5 g/10 min. , linear low-density polyethylene (LLDPE) having a density of 0.932 g/cm 3 ; low density polyethylene (LDPE) having a melt index of about 1.8 g/10 min and a density of 0.925 g/cm 3 ; and ethylene vinyl acetate (EVA) having a vinyl acetate content of 45% by weight in a weight ratio of 20: 20: 60 was used.

In addition, the sheet composition for the lower layer has a melt index of about 0.5 g/10 min, and a density of 0.932 g/cm 3 linear low density polyethylene (LLDPE); Low density polyethylene (LDPE) having a melt index of about 1.8 g/10 min and a density of 0.925 g/cm 3 , and a metallocene linear low density having a melt index of 0.5 to 2.0 g/10 min and a density of 0.920 to 0.928 g/cm 3 Low-density polyethylene (LDPE) mixed with polyethylene (mLLDPE) in a weight ratio of 8:2; and ethylene vinyl acetate (EVA) having a vinyl acetate content of 20% by weight in a weight ratio of 30: 50: 20, and with respect to 100 parts by weight of the sheet composition for the lower layer (3), ultraviolet (UV) absorption and 8 parts by weight of a blocking agent, 15 parts by weight of an antifogging agent, and 20 parts by weight of a methyl etherified melamine resin having a methoxy group were used. In this case, the ultraviolet (UV) absorption and blocking agents are butylmethoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyltriazine and 2-(3'-allyl-2'-hydroxy-5'-methylphenyl)benzotria A mixture of the sol in a weight ratio of 2: 1: 1 was used. In addition, as the antifogging agent, a mixture of dodecyl sulfoacetate, sorbitan fatty acid ester, and glycerin fatty acid ester in a weight ratio of 1: 2: 2 was used.

<Example 2>

After superimposing two 5-layer insulation sheets for a plastic house prepared in Example 1 as shown in FIG. 3, and then heat-sealing them using hot air, a heat-sealed 5-layer insulation sheet for a plastic house was produced. . At this time, the heat-sealed portion was made to have a width × length of 2 m × 3 m for physical property evaluation.

<Comparative Example 1>

A low-density polyethylene (LDPE) having a melt index of about 1.8 g/10 min and a density of 0.925 g/cm 3 and ethylene vinyl acetate (EVA) having a vinyl acetate content of 20% by weight of 70: 30 as a sheet composition for the lower layer In the same manner as in Example 1, except that it contains 8 parts by weight of an ultraviolet (UV) absorbing and blocking agent and 15 parts by weight of an antifogging agent with respect to 100 parts by weight of the sheet composition for the lower layer, the vinyl A five-layer insulation sheet for a house was manufactured.

<Comparative Example 2>

A 5-layer heat insulating sheet for a plastic house was manufactured in the same manner as in Example 2, except that two 5-layer heat insulating sheets for a plastic house prepared in Comparative Example 1 were used.

<Test Example>

1) Evaluation of anti-fogging properties

1-1) Initial anti-fogging properties

The time until the water droplet starts to flow in the condition in which condensation is difficult was taken as a reference|standard, and it was set as the criterion for judging the antifogging property.

More specifically, on the upper part of the water tank into which water is placed, the 5-layer heat insulating sheets for the plastic house prepared in Examples 1 and 2 and Comparative Examples 1 and 2 are placed with the lower layer 50 toward the inside of the water tank, and the outside ( o) Maintain the temperature at 15℃ and the temperature in the water tank at 25℃, and visually observe the rate of antifogging at the time of the elapse of a predetermined time. Anti-fogging properties were evaluated. The results are shown in Table 1 below.

○: The time until the water droplet starts to flow is shorter than 60 minutes.

(triangle|delta): Time until the water droplet starts to flow 60 minutes or more and shorter than 150 minutes.

x: The time until the water droplet starts to flow is 150 minutes or more.

1-2) Anti-fogging persistence

Maintaining the outside temperature at 23 ° C and the water temperature in the water tank at 50 ° C, visually observing the rate of anti-fogging at the time of 1 month, and depending on the time until the water droplets start to flow, the anti-fogging property is evaluated. The results are shown in Table 1 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Early anti-fogging ○ ○ ○ × anti-fog persistence ○ ○ × ×

As can be seen in Table 1, it was confirmed that the thermal insulation sheet for a plastic house prepared in Example 1 of the present invention was very excellent in initial anti-fogging properties and anti-fogging properties. In particular, as can be seen from the results of the insulation sheet for a plastic house prepared in Example 2, even when two 5-layer insulation sheets for a plastic house are bonded by heat fusion, the excellent initial anti-fogging and anti-fogging properties are maintained. However, it was confirmed that the five-layer thermal insulation sheet for a plastic house prepared in Comparative Example 1 had excellent initial anti-fogging properties, but deteriorated anti-fogging properties. In addition, it was confirmed that the five-layer insulating sheet for a plastic house prepared in Comparative Example 2 was deteriorated in both initial anti-fogging properties and anti-fogging properties through the heat sealing process.

2) Sheet property evaluation

For the 5-layer insulating sheets for a plastic house prepared in Examples 1 and 2 and Comparative Examples 1 and 2, the sheet properties (tensile strength, rupture strength, weather resistance) were evaluated as follows and are shown in Table 2.

Test Methods Example 1 Example 2 Comparative Example 1 Comparative Example 2 Tensile strength (N) KS K 0521 1,000 1,200 850 900 Bursting strength (kPa) KS K 0351 2,000 2,250 1,580 1,650 Weather resistance (remaining kidney rate, %) KPS M 1004 : 2009 80% 55% 50% 35%

As can be seen in Table 2, the 5-layer insulating sheet for a plastic house prepared in Examples 1 and 2 of the present invention is superior to the 5-layer insulating sheet for a plastic house prepared in Comparative Examples 1 and 2, It was confirmed that it has physical properties. In particular, as can be seen from the results of the five-layer insulation sheet for a plastic house prepared in Example 2, when two five-layer insulation sheets for a plastic house are bonded by thermal fusion, they have superior tensile and burst strength. could confirm that

As described above, those skilled in the art to which the present invention pertains will be able to understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that all of the embodiments described above are illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention, rather than the above detailed description, all changes or modifications derived from the meaning and scope of the claims to be described later and their equivalents.

10: upper layer
20: first middle layer
30: second middle layer
40: third middle layer
50: lower layer
60: air cap
70: micropores

Claims (4)

The upper layer 10 facing the outside of the plastic house, the first intermediate layer 20 and the third intermediate layer 40 in which a plurality of air caps 60 are formed, the first intermediate layer 20 and the third intermediate layer 40 In the 5-layer thermal insulation sheet for a plastic house comprising a second intermediate layer 30 inserted between, and a lower layer 50 facing the inside of the plastic house,
The upper layer 10 and the second intermediate layer are 40 to 60% by weight of linear low-density polyethylene (LLDPE), 20 to 40% by weight of low-density polyethylene (LDPE), and 10 to 30% by weight of ethylene vinyl acetate (EVA) For an upper layer comprising, and It will include a sheet composition for a second intermediate layer,
The first intermediate layer 20 and the third intermediate layer 40 include 10 to 30% by weight of linear low density polyethylene (LLDPE), 10 to 30% by weight of low density polyethylene (LDPE), and 50 to 70% by weight of ethylene vinyl acetate (EVA). It will include a sheet composition for a first intermediate layer and a third intermediate layer comprising,
The lower layer 50 is a sheet composition for the lower layer comprising 20 to 40% by weight of linear low density polyethylene (LLDPE), 40 to 60% by weight of low density polyethylene (LDPE), and 10 to 30% by weight of ethylene vinyl acetate (EVA) will,
The upper layer 10 and the second intermediate layer 30 further include 1 to 15 parts by weight of an ultraviolet (UV) absorbing and blocking agent based on 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer, and the lower layer 50 is Based on 100 parts by weight of the sheet composition for the lower layer, 1 to 15 parts by weight of an ultraviolet (UV) absorbing and blocking agent and 1 to 15 parts by weight of an antifogging agent are further included,
The antifogging agent is a mixture of C8 to C18 alkyl sulfoacetate, sorbitan fatty acid ester, and glycerin fatty acid ester in a weight ratio of 1: 2: 2,
The lower layer 50 is a 5-layer insulating sheet for a plastic house, characterized in that it further comprises 5 to 20 parts by weight of a methyl etherified melamine resin having a methoxy group, based on 100 parts by weight of the sheet composition for the lower layer.
The method according to claim 1,
Linear low-density polyethylene (LLDPE) included in the upper layer 10 and the second intermediate layer 30, the first intermediate layer 20, the third intermediate layer 40, and the lower layer 50 has a melt index of 0.1 to 1.7 g/10 min and having a density of 0.920 to 0.936 g/cm 3 ;
The low density polyethylene (LDPE) included in the upper layer 10 and the second intermediate layer 30, the first intermediate layer 20, the third intermediate layer 40, and the lower layer 50 has a melt index of 0.5 to 2.0 g/10 min. and has a density of 0.920 to 0.928 g/cm 3 ;
The low-density polyethylene (LDPE) included in the lower layer 50 has a melt index of 0.5 to 2.0 g/10 min, and a density of 0.920 to 0.928 g/cm 3 of metallocene linear low-density polyethylene (mLLDPE) containing 0.1 to 20% by weight. to do;
Ethylene vinyl acetate (EVA) contained in the upper layer 10 and the second intermediate layer 30 and the lower layer 50 is that the content of vinyl acetate is 0.1 to 25% by weight;
Ethylene vinyl acetate (EVA) included in the first intermediate layer (20) and the third intermediate layer (40) is a five-layer insulating sheet for a vinyl house, characterized in that the content of vinyl acetate is 30 to 50 wt%.
The method according to claim 1,
One surface of the upper layer 10 facing the first intermediate layer 20 and one surface of the lower layer 50 facing the third intermediate layer 40 are foamed to include micropores 70,
The thickness ratio of the upper layer 10 and the second intermediate layer 30, the first intermediate layer 20 and the third intermediate layer 40, and the lower layer 50 is 2:1:2, respectively. layer insulation sheet.
4. The method according to claim 3,
The upper layer 10 and the second intermediate layer 30 are to further include 5 to 20 parts by weight of a melamine resin and 0.1 to 2 parts by weight of a foaming agent with respect to 100 parts by weight of the sheet composition for the upper layer and the second intermediate layer,
The lower layer 50 is 5 layers for a vinyl house, characterized in that it further comprises 5 to 20 parts by weight of a methyl etherified melamine resin having a methoxy group and 0.1 to 2 parts by weight of a foaming agent with respect to 100 parts by weight of the sheet composition for the lower layer. insulation sheet.

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