KR20190142629A - Foam sheet for reducing environmental load and manufacturing method the same - Google Patents

Abstract

One embodiment of the present invention provides a foam sheet for reducing environmental load, including a foam layer; and a deodorizing coating layer, wherein Internal residual ammonia concentration is less than 10 ppm, the foam layer is formed by foaming a composition comprising a polyolefin resin and a foaming agent, and the deodorizing coating layer is formed by coating a deodorizing material on the foam layer surface using a photocuring agent. Thus, it is possible to effectively remove environmental load substances remaining in the foam sheet while maintaining a foaming ratio, color and physical properties of the foam sheet.

Description

Foam sheet for reducing environmental load and manufacturing method thereof

The present invention relates to a foam sheet for reducing the environmental load and a method for manufacturing the same, and more particularly, to a foam sheet for reducing the environmental load, characterized in that the deodorizing material coating layer is formed on the surface of the foam layer using a photocuring agent.

Polymer materials most often used in the manufacture of foam sheets include polyurethane, polyolefin, polyvinyl chloride, and the like. A foaming agent is added to foam the polymers, and examples of the foaming agent include azo compounds, nitroso compounds, and sulfonylhydrazide compounds. In particular, azodicarbonamide in the azo compound is known to be an excellent blowing agent because the generation of nitrogen gas by heating proceeds rapidly, the decomposition product is nonflammable, non-toxic.

In the case of a large amount of gas discharged from the blowing agent, the expansion ratio is improved, but there is a problem that harmful gases such as ammonia and formamide are generated and remain inside the foam sheet after foaming.

In order to solve this problem, a method of dehydrating the gaseous formamide to hydrogen cyanide (HCN) has been disclosed, but the method has to be performed at a high temperature (350-600 ° C.) for a long time. There is a disadvantage. It has also been proposed to convert formamide to hydrogen cyanide for a short time (20 seconds) and at relatively low temperatures (220-240 ° C), but it is not economical because it requires the use of special thermal coating equipment coated with a catalyst. Has the disadvantage of being limited.

In addition, a technique of mixing a blowing agent and an inorganic deodorant material in the foaming process has been proposed, but there is a problem of incompatibility with a polyolefin resin composed of an organic material as a main component of the foam sheet, and due to the added inorganic deodorant material, There is a problem that the physical properties are not reduced or the expansion ratio is not maintained, and the deodorizing effect of the residual harmful gas inside the foam sheet is not shown.

The technical problem to be achieved by the present invention is to solve the above problems, while maintaining the expansion ratio, color and physical properties of the foam sheet foam sheet and a method of manufacturing the same that can effectively remove the environmental load substances remaining in the foam sheet To provide.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, an embodiment of the present invention is a foam layer; And a deodorizing material coating layer positioned on the surface of the foam layer, wherein the residual ammonia concentration in the foam layer is less than 10 ppm, and the foam layer is formed by foaming a composition comprising a polyolefin resin and a foaming agent, and the deodorizing material coating layer The foam layer provides a foam sheet for reducing the environmental load, characterized in that formed by coating a deodorizing material using a photocuring agent on the surface of the foam layer.

In one embodiment of the present invention, the polyolefin resin is polyethylene, polypropylene, polyisoprene, polybutadiene, polystyrene, polystyrene butadiene, polychloroprene, polyethylene-vinyl acetate, polyvinylchloride, polyethylene terephthalate and polypropylene terephthalate It may be any one or more selected from among.

In one embodiment of the present invention, the blowing agent is azodicarbonamide, N, N'-dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, p, p'-oxybis (benzene Sulfonylhydrazide), p-toluenesulfonyl semicarba, azobisisobutyronitrile, and diazoaminoazobenzene.

In one embodiment of the present invention, the composition may include 90 to 99.9 parts by weight of the polyolefin resin and 0.1 to 10 parts by weight of the blowing agent.

In one embodiment of the present invention, the deodorizing material may be any one or more selected from gel-light (Ge-lite), zeolite (Zeolite), terra alba (terra alba) and those decolorized.

In one embodiment of the present invention, the photocuring agent may include an acrylate oligomer, an acrylate monomer and a photopolymerization initiator.

In one embodiment of the present invention, the deodorizing material coating layer may have a thickness of 0.1 to 10% of the thickness of the foam layer.

In one embodiment of the present invention, the foam sheet may further include one or more of antioxidants, light stabilizers, lubricants, antistatic agents and colorants.

In one embodiment of the present invention, the foaming ratio of the foam sheet may be less than 20% difference from the foaming ratio in another foam sheet without the deodorizing material coating layer.

In one embodiment of the present invention, the chromaticity of the foam sheet may be less than 20% of the amount of change in chromaticity in the same foam sheet without the deodorizing material coating layer.

In one embodiment of the present invention, the specific gravity of the foam sheet may be from 0.15 to 0.20.

In order to achieve the above technical problem, another embodiment of the present invention is to form a foam layer by foaming a composition comprising a polyolefin-based resin and a blowing agent; Applying a composition comprising a deodorizing material and a photocuring agent on the surface of the foam layer; And forming a deodorizing material coating layer by photocuring the composition comprising the deodorizing material and the photocuring agent.

In another embodiment of the present invention, the forming of the foam layer may be to foam the polyolefin-based resin by using a gas from which the blowing agent is pyrolyzed.

In another embodiment of the present invention, the decomposition temperature of the blowing agent may be 130 to 250 ℃.

In another embodiment of the present invention, the step of applying a composition comprising a deodorant material and a photocuring agent on the surface of the foam layer using a spray coating, dip coating or spin coating method of the composition comprising the deodorant material and the photocuring agent It may be to apply.

In another embodiment of the present invention, the deodorizing material may be any one or more selected from gel-light (Ge-lite), zeolite (Zeolite), terra alba (terra alba) and those decolorized.

According to an embodiment of the present invention, it is possible to provide a foam sheet and a method of manufacturing the same that can effectively remove the environmental load substances remaining in the foam sheet while maintaining the expansion ratio, color and physical properties of the foam sheet.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a flowchart showing a method for manufacturing a foam sheet for reducing environmental load according to the present invention.
2 is a SEM image of the surface of the preparation example and the comparative example according to the present invention.
Figure 3 is a cross-sectional SEM photograph of the preparation and comparative example according to the present invention.
Figure 4 is a photograph of the sample for measuring the chromaticity of the Preparation Example and Comparative Example according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, coupled) with another part, it is not only" directly connected "but also" indirectly connected "with another member in between. "Includes the case. In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or combinations thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the foam sheet for reducing environmental load will be described.

The present invention is a foam layer; And a deodorizing material coating layer positioned on the surface of the foam layer, wherein the residual ammonia concentration in the foam layer is less than 10 ppm, and the foam layer is formed by foaming a composition comprising a polyolefin resin and a foaming agent, and the deodorizing material coating layer The foam layer provides a foam sheet for reducing the environmental load, characterized in that formed by coating a deodorizing material using a photocuring agent on the surface of the foam layer.

The polyolefin resin is obtained by mixing a foaming agent to obtain a foam in which the polymer is foamed when heated. The polyolefin resin may be any one or more selected from polyethylene, polypropylene, polyisoprene, polybutadiene, polystyrene, polystyrene butadiene, polychloroprene, polyethylene-vinyl acetate, polyvinylchloride, polyethylene terephthalate, and polypropylene terephthalate. Mixtures thereof, other thermoplastic resins, rubbers, and the like may be further included, but are not limited thereto, and any foamable polymer capable of obtaining a foam may be used. For example, it may include a functionalized version of the polyolefinic resin, such as maleated polypropylene.

The polyolefin-based resin may include linear low density polyethylene. It may also include medium density polyethylene, which may be, for example, from about 0.92 g / cc to about 0.94 g / cc or from about 0.926 g / cc to about 0.94 g / cc as measured by ASTM D-792. Ethylene-based polymer having a density of. The polyolefin-based resin may also include high density polyethylene. High density polyethylene refers to an ethylene-based polymer having a density of about 0.94 g / cc to about 0.97 g / cc as measured by ASTM D-792.

The blowing agent is azodicarbonamide, N, N'-dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, p, p'-oxybis (benzenesulfonylhydrazide), p-toluene At least one selected from sulfonyl semicarba, azobisisobutyronitrile, and diazoaminoazobenzene.

The blowing agent is used in combination with the polyolefin-based resin, it is decomposed upon heating to form a porous foam. Azodicarbonamide may be used alone, or two or more of the above-listed blowing agents may be mixed or used, or a mixture of conventional blowing agents such as sodium hydrogencarbonate and sodium carbonate may be further mixed. In the case of mixing other blowing agents, the mixing amount may be changed according to the purpose of foaming magnification control, for example, but may be used by mixing 0.01 to 50 parts by weight of the other blowing agent with respect to 100 parts by weight of azodicarbonamide, but is not limited thereto. .

The composition including the polyolefin-based resin and the blowing agent may include 90 to 99.9 parts by weight of the polyolefin-based resin and 0.1 to 10 parts by weight of the blowing agent. If the foaming agent is less than 0.1 parts by weight, the foaming does not occur sufficiently, so the hardness and specific gravity of the prepared foam sheet may be very high, and if the foaming agent is more than 10 parts by weight, the structure of the foam sheet is unstable due to excessive foaming and mechanical properties It is not preferable because there is a problem of deterioration.

The deodorizing material may be any one or more selected from gel-lite, zeolite, terra alba, and those decolorized.

The gel-lite (Ge-lite) may be characterized in that it comprises a pozzolan (pozzolan). Pozoran is a natural deodorant which solves the problem of not being environmentally friendly to artificial deodorants and recyclable consumables, and is a material that has a low deodorization rate of a conventional natural deodorant or is difficult to store in a refrigerator in which food is stored. In addition, Pozoran is a natural mineral that exhibits a far-infrared and anion-releasing action as well as a deodorizing effect. For example, the components of pozzolan may be characterized by comprising SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , MgO, K ₂ O, Na ₂ O, CaO, TiO ₂ , MnO or P ₂ O ₅ Can be.

Pozoran has been studied to have far infrared and negative ion release function, antibacterial function and deodorization function, and is widely used in a wide range of fields such as construction, agriculture, animal husbandry, ceramic processing, environmental improvement agent, medical care and cosmetic materials. For example, it is widely used in ceramics, clay, baths, functional accessories, and various tiles as additives for building materials, removal of harmful substances, oxygen supply, humidity control, deodorant, antibacterial, anti-inflammatory and all ceramic related raw materials.

The decolorized gelite (Ge-lite) is a decolorized gel using the acid (Ge-lite). The use of pojoran or pojoran powder itself as a deodorant has a problem that storage and use are not easy. In addition, unlike ordinary clay, pojoran is difficult to knead mixed with it, and even after baking after kneading, the porous structure of pojoran itself is reduced through the firing action, so that the deodorization rate is lowered. There is a problem with limitations. In order to solve this problem, the gelatin (Ge-lite) containing the pozzolan decolored using an acid is a decolorized gelite (Ge-lite). For example, decolorized gellite (Ge-lite) can be obtained by decolorizing by adding HCl to the pozzo eggs and calcining the decolorized pozzo eggs.

 Decoloring gelite (Ge-lite) has the advantage of being able to use semi-permanently as a deodorant by increasing the whiteness through the decolorization of the original ocher color while further increasing the deodorizing effect peculiar to Pozoran.

Zeolites are minerals in which alkali metals and alkaline earth metals are bonded to anions formed by the combination of aluminum oxide and silica. That is, it means a crystalline aluminum silicate mineral. It is a kind of hydrous aluminum silicate mineral which mainly contains alkali metal or alkaline earth metal, and the tetrahedral structure is combined with a three-dimensional network. By this gap, it has molecular sieve function and at the same time performs adsorption function. Zeolites have pores of a certain size and can adsorb by selectively passing molecules smaller than this.

The main ingredients for terra alba are kaolinite and halosite. Kaolinite is a clay mineral whose chemical composition is Al ₂ Si ₂ O ₅ (OH), and one tetrahedral sheet is a layered silicate mineral whose oxygen atoms are connected to one octahedral sheet, the octahedron of alumina. Haloysite is an aluminum silicate clay mineral with an aluminum to silicon ratio of 1: 1 and has a chemical composition of Al ₂ Si ₂ O ₅ (OH) ₄ .

The photocuring agent may be one containing an acrylate oligomer, an acrylate monomer and a photopolymerization initiator. The acrylate oligomer and acrylate monomers have photocurability, and the acrylate monomers are methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decanyl (meth) acrylate, undecanyl (meth) acrylate, dodecyl Unsaturated carboxylic esters including (meth) acrylic acid esters such as (meth) acrylate and cyclohexyl (meth) acrylate; Unsaturated carboxylic acid amino alkyl esters such as 2-aminoethyl (meth) acrylate and 2-dimethylaminoethyl (meth) acrylate; Saturated or unsaturated carboxylic acid vinyl esters such as vinyl acetate; Vinyl cyanide compounds such as (meth) acrylonitrile; Unsaturated amide compounds such as (meth) acrylamide; Ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth ) Acrylate, octanediol di (meth) acrylate, nonanediol di (meth) acrylate, decanediol di (meth) acrylate, undecanediol di (meth) acrylate, dodecanediol di (meth) acrylate Neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol di (meth) acrylic Rate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate Or it may be a mixture thereof, and the like.

The photopolymerization initiator capable of performing the photocurable reaction may include, for example, triazine, acetophenone, benzophenone, thioxanthone, benzoin, phosphorus, oxime or mixtures thereof.

Triazine initiators include 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (3 ', 4'-dimethoxy Styryl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4'-methoxy naphthyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxy phenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2- Biphenyl-4,6-bis (trichloromethyl) -s-triazine, bis (trichloromethyl) -6-styryl-s-triazine, 2- (naphtho-1-yl) -4,6 -Bis (trichloro methyl) -s-triazine, 2- (4-methoxy naphtho-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloro Methyl (piperonyl) -6-triazine, 2,4- (trichloro methyl (4'-methoxy styryl) -6-triazine, or mixtures thereof.

Examples of the acetophenone-based initiators include 2,2'-diethoxy acetophenone, 2,2'-dibutoxy acetophenone, 2-hydroxy-2-methyl propiophenone, pt-butyl trichloro acetophenone and pt-butyl Dichloro acetophenone, 4-chloro acetophenone, 2,2'-dichloro-4-phenoxy acetophenone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholino propan-1-one , 2-benzyl-2-dimethyl amino-1- (4-morpholino phenyl) -butan-1-one, mixtures thereof.

As the benzophenone initiator, benzophenone, benzoyl benzoic acid, methyl benzoyl benzoate, 4-phenyl benzophenone, hydroxy benzophenone, acrylated benzophenone, 4,4'-bis (dimethyl amino) benzophenone, 4,4'-dichloro Benzophenone, 3,3'-dimethyl-2-methoxy benzophenone or mixtures thereof.

Thioxanthone initiators include thioxanthone, 2-methyl thioxanthone, isopropyl thioxanthone, 2,4-diethyl thioxanthone, 2,4-diisopropyl thioxanthone, and 2-chloro thioke Santon or mixtures thereof.

The benzoin-based initiator may be benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzyl dimethyl ketal or mixtures thereof.

The phosphorus initiator may be bisbenzoylphenyl phosphine oxide, benzoyldiphenyl phosphine oxide or mixtures thereof.

Examples of oximes include 2- (o-benzoyloxime) -1- [4- (phenylthio) phenyl] -1,2-octanedione and 1- (o-acetyloxime) -1- [9-ethyl-6- ( 2-methylbenzoyl) -9H-carbazol-3-yl] ethanone, or mixtures thereof.

The photopolymerization initiator may be included in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the total amount of the acrylate oligomer, the acrylate monomer and the photopolymerization initiator in the photocuring agent. Photopolymerization may occur sufficiently during exposure within the above range, and the deodorization efficiency of the deodorizing material may be prevented from being lowered due to the unreacted initiator remaining after the photopolymerization. Specifically, it may be included as 0.5 to 10 parts by weight, more specifically 1 to 8 parts by weight.

The deodorizing material coating layer may have a thickness of 0.1 to 10% of the thickness of the foam layer. If the thickness of less than 0.1% deodorizing material coating layer is too thin may not be sufficient deodorizing effect, if having a thickness of more than 10% is not preferable because the inherent physical properties of the foam sheet may be lowered. Specifically, the thickness may be 1 to 7%, more specifically 3 to 5%.

The foam sheet may further include one or more of antioxidants, light stabilizers, lubricants, antistatic agents and colorants. The foam sheet may be prepared by adding other additives in addition to the polyolefin resin, the foaming agent and the deodorizing material coating layer. The other additives may be antioxidants, light stabilizers, lubricants, antistatic agents, colorants or combinations thereof. The content of the other additives may be added in 0.01 to 5 parts by weight, more preferably 0.5 to 2 parts by weight of the total weight of the foam sheet. The above range is a range which does not impair other properties of the foam sheet, and if it exceeds the above range, the physical properties of the foam sheet may be lowered, which is not preferable.

The foaming ratio of the foam sheet may be less than 20% from the foaming ratio in another foam sheet without the deodorizing material coating layer. The foaming ratio in the foam sheet can be measured by specific gravity, and the difference in specific gravity with and without deodorant coating layer is less than 20%. If the difference in specific gravity exceeds 20%, the physical properties of the foam sheet are weakened, which is not preferable. The present invention is characterized in that the difference in specific gravity is less than 20%, while reducing the environmental load substances such as ammonia remaining inside while maintaining the physical properties of the foam sheet. Specifically, the difference in foaming ratio may be less than 10%, more specifically less than 3%.

The chromaticity of the foam sheet may be less than 20% from the chromaticity in another same foam sheet without the deodorizing material coating layer. The change in chromaticity can be measured by ASTM E1164. If the change in chromaticity exceeds 20%, there is a problem that the foam sheet cannot be adopted in the desired products such as mats, soles, building materials, and packaging materials. . The present invention is characterized by reducing environmental load substances such as ammonia remaining therein while maintaining the amount of chromaticity change less than 20%. Specifically, the chromaticity change amount may be less than 10%, more specifically less than 5%.

Specific gravity of the foam sheet may be 0.15 to 0.20. If it is less than 0.15, the rigidity as a sheet cannot be secured sufficiently, and if it is more than 0.20, the flexibility and elasticity of the sheet decrease, which is not preferable.

Hereinafter, a method for manufacturing a foam sheet for reducing environmental load will be described.

Referring to Figure 1, the present invention comprises the steps of foaming a composition comprising a polyolefin resin and a blowing agent to form a foam layer (S100); Applying a composition comprising a deodorizing material and a photocuring agent on the surface of the foam layer (S200); And forming a deodorant material coating layer by photocuring the composition including the deodorant material and the photocuring agent (S300).

Forming the foam layer (S100) may be to foam the polyolefin resin using a gas from which the blowing agent is pyrolyzed.

The decomposition temperature of the blowing agent may be 130 to 250 ℃. The decomposition temperature of the blowing agent may determine the process temperature of the foaming process, but if it exceeds 250 ° C., the polyolefin-based resin may be partially decomposed or the energy input into the process may be excessive. At a temperature below 130 ° C., the gas generated by decomposition of the blowing agent is not sufficiently spread and the foaming efficiency is reduced, which is not preferable.

Applying a composition comprising a deodorant material and a photocuring agent on the surface of the foam layer (S200) may be to apply a composition comprising the deodorant material and the photocuring agent by spray coating, dip coating or spin coating method. .

Spray coating is a coating method of spraying the composition to be coated to obtain a coating layer. It is also used for coating nano thin films, and is widely used for urethane, plastic coating, and paint coating.

Dip coating is a coating method in which the deposit to be coated on the suspension is vertically dipped and then slowly lifted while maintaining the vertical at a constant speed. It is also possible to mask the deposit so that only a portion is coated. The thickness of the membrane is determined by the viscosity of the suspension and the lifting speed, and if the flow does not proceed smoothly, there is a disadvantage in that drops are formed at the edges of the formed membrane and the coating surface is not even.

Spin coating is a method in which a film is coated while the suspension is fixed to a rotating disk, and the suspension is dropped in the center to spread the suspension by centrifugal force. The thickness of the membrane is determined by the viscosity of the suspension and the angular velocity of the rotor.

The deodorizing material may be any one or more selected from gel-lite, zeolite, terra alba, and those decolorized.

Hereinafter, the present invention will be described in more detail with reference to Preparation Examples and Experimental Examples.

Preparation Example 1

95 parts by weight of polyvinyl chloride and 5 parts by weight of azodicarbonamide were mixed and stirred. The resulting sol was coated on release paper and foamed at 220 ° C. for about 2 minutes to form a foam layer. Photocuring agent and deodorizing agent comprising 60 parts by weight of aliphatic urethane acrylate oligomer, 35 parts by weight of 1,6-hexanediol di (meth) acrylate as acrylate monomer and 5 parts by weight of 2,2'-diethoxy acetophenone as photopolymerization initiator As a raw material, a composition in which decolorized gelite (Ge-lite) was mixed was prepared. Spray coating the composition comprising the deodorant material on the surface of the foam layer, and exposed to UV for 3 minutes to form a coating layer to prepare a foam sheet.

Preparation Example 2

A foam sheet was prepared in the same manner as in Preparation Example 1, except that zeolite was used as the deodorizing material.

Preparation Example 3

A foam sheet was prepared in the same manner as in Preparation Example 1, except that terra alba was used as a deodorizing material.

Comparative Example 1

Foam sheet was prepared in the same manner as in Preparation Example 1 except that the coating layer including the deodorizing material was not formed.

Comparative Example 2

A foam sheet was prepared in the same manner as in Preparation Example 1, except that gel-lite (Ge-lite) was not used as a deodorizing material.

Experimental Example 1

Surface SEM images of the foam sheets prepared in Preparation Examples 1 to 3 and Comparative Examples 1 to 2 are shown in FIG. 2. In addition, cross-sectional SEM images of the foam sheets prepared in Preparation Examples 1 to 3 and Comparative Examples 1 to 2 are shown in FIG.

2 and 3 it can be seen that the coating layer containing the deodorizing material on the surface of the foam layer is coated with a thickness of several hundred ㎛.

Experimental Example 2

The test pieces of the foam sheets prepared in Preparation Examples 1 to 3 and Comparative Examples 1 and 2 were cut into 5 L Tedlar bags in a size of 10 cm Ⅹ 10 cm cm 3 cm, and the Tedlar bags were sealed. 3 L of N ₂ gas was charged using a pump, and ammonia was released for 1 hour under the condition of (80 ± 2) ° C., and then the ammonia emission concentration was measured using a detection tube. The measured ammonia release concentration is shown in Table 1 below. The detection limit is 10 ppm.

division Comparative Example 1 Comparative Example 2 Preparation Example 1 Preparation Example 2 Preparation Example 3 Ammonia Release Concentration (ppm) 165 100 78 Less than 10 Less than 10

According to the <Table 1> from the 165ppm of Comparative Example 1 it can be seen that the production example according to the invention reduced the ammonia emission concentration to less than 10ppm maximum.

Experimental Example 3

The chromaticity of the foam sheets prepared in Preparation Examples 1 to 3 and Comparative Examples 1 and 2 by ASTM E1164 was measured and shown in Table 2 below. In addition, Figure 4 shows a sample photograph for measuring the chromaticity of the foam sheet.

division Test Methods Test result Comparative Example 1 ASTM E1164 L ^· 80.32 a ^· -0.55 b ^· 8.56 Comparative Example 2 ASTM E1164 L ^· 34.66 a ^· 11.92 b ^· 11.94 Preparation Example 1 ASTM E1164 L ^· 66.88 a ^· 2.75 b ^· 12.29 Preparation Example 2 ASTM E1164 L ^· 72.65 a ^· 0.60 b ^· 17.06 Preparation Example 3 ASTM E1164 L ^· 77.42 a ^· 0.88 b ^· 8.68

Wherein it can be seen that <Table 2> and 4, the existing foam sheet of Comparative Example 1, almost no difference to the present invention produced the color change amount is b ^· reference least 1.40% of the example according to according to.

Experimental Example 4

The results of measuring specific gravity and density of the foam sheets prepared in Preparation Examples 1 to 3 and Comparative Examples 1 to 2 are shown in Table 3 below.

division Comparative Example 1 Comparative Example 2 Preparation Example 1 Preparation Example 2 Preparation Example 3 Specific gravity (no unit) 0.160 0.177 0.174 0.191 0.163 Density (g / cm ³ ) 0.160 0.176 0.190 0.173 0.162

According to the <Table 3> it can be seen that the density change amount of the preparation examples according to the present invention is at least 1.3% and there is almost no difference in foaming ratio with Comparative Example 1 which is a conventional foam sheet.

Therefore, according to the present invention, it is possible to manufacture a foam sheet in which the ammonia emission concentration is greatly reduced to less than 10 ppm while having almost no change in color and expansion ratio.

The above description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

Claims (16)

Foam layer; And
Deodorant material coating layer located on the foam layer surface,
The residual ammonia concentration inside the foam layer is less than 10 ppm,
The foam layer is formed by foaming a composition comprising a polyolefin resin and a blowing agent,
The deodorizing material coating layer is a foam sheet for reducing environmental load, characterized in that formed on the surface of the foam layer by coating a deodorizing material using a photocuring agent.
The method of claim 1,
The polyolefin resin is any one or more selected from polyethylene, polypropylene, polyisoprene, polybutadiene, polystyrene, polystyrene butadiene, polychloroprene, polyethylene-vinyl acetate, polyvinylchloride, polyethylene terephthalate and polypropylene terephthalate Foam seat for reducing environmental load.
The method of claim 1,
The blowing agent is azodicarbonamide, N, N'-dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazide, p, p'-oxybis (benzenesulfonylhydrazide), p-toluene Foam sheet for reducing environmental load, characterized in that any one or more selected from sulfonyl semi-carba, azobisisobutyronitrile, and diazoaminoazobenzene.
The method of claim 1,
The composition is a foam sheet for reducing environmental load, characterized in that it comprises 90 to 99.9 parts by weight of the polyolefin resin and 0.1 to 10 parts by weight of the blowing agent.
The method of claim 1,
The deodorizing material is a foam sheet for reducing environmental load, characterized in that any one or more selected from gel-light (Ge-lite), zeolite (Zeolite), terra alba (terra alba) and these decolorized.
The method of claim 1,
The photocuring agent is a foam sheet for reducing the environmental load, characterized in that it comprises an acrylate oligomer, an acrylate monomer and a photopolymerization initiator.
The method of claim 1,
The deodorizing material coating layer is a foam sheet for reducing environmental load, characterized in that having a thickness of 0.1 to 10% of the thickness of the foam layer.
The method of claim 1,
The foam sheet is a foam sheet for reducing the environmental load, characterized in that it further comprises one or more of antioxidants, light stabilizers, lubricants, antistatic agents and colorants.
The method of claim 1,
The foaming ratio of the foam sheet is a foam sheet for reducing the environmental load, characterized in that the difference from the foaming ratio in another foam sheet without the deodorizing material coating layer is less than 20%.
The method of claim 1,
The chromaticity of the foam sheet is a foam sheet for reducing the environmental load, characterized in that the amount of change from the chromaticity in other same foam sheet without the deodorizing material coating layer is less than 20%.
The method of claim 1,
Specific gravity of the foam sheet is a foam sheet for reducing environmental load, characterized in that 0.15 to 0.20.
Foaming a composition comprising a polyolefin-based resin and a blowing agent to form a foam layer;
Applying a composition comprising a deodorizing material and a photocuring agent on the surface of the foam layer; And
Method of producing a foam sheet for reducing the environmental load comprising the step of forming a deodorizing material coating layer by photocuring the composition comprising the deodorizing material and the photocuring agent.
The method of claim 12,
Forming the foam layer is a foam sheet manufacturing method for reducing the environmental load, characterized in that for foaming the polyolefin resin using a gas from which the blowing agent is pyrolyzed.
The method of claim 12,
The decomposition temperature of the foaming agent is a foam sheet for reducing the environmental load, characterized in that 130 to 250 ℃.
The method of claim 12,
The step of applying a composition comprising a deodorant material and a photocuring agent on the surface of the foam layer is characterized by applying a composition comprising the deodorant material and the photocuring agent by spray coating, dip coating or spin coating method Reduction foam sheet manufacturing method.
The method of claim 12,
The deodorizing material is ge-lite, zeolite, zeolite, terra alba, and any one or more selected from those subjected to decolorization treatment, respectively, characterized in that the foam sheet for reducing the environmental load.

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