JP2008062497A - Polyolefin resin laminated foam having deodorizing function and cylindrical body or molded body made of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyolefin resin laminated foam suitable for a heat insulating material for piping, a metal roof heat insulating material or the like capable of suppressing odor of the polyolefin resin foam using an azo-type heat-decomposable chemical foaming agent and odor including the surroundings under an environment using the foam. <P>SOLUTION: The polyolefin resin laminated foam with a deodorizing function is characterized in that a polyolefin resin layer at least containing a deodorizing agent is provided on a surface layer face of at least one face of the polyolefin resin foam. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a polyolefin resin laminate foam in which a polyolefin resin layer having a deodorizing function is provided on a polyolefin resin crosslinked foam.

  Polyolefin-based resin foams are used for heat insulation, cold insulation, heat insulation such as pipe insulation for air conditioning equipment, water pipe freeze prevention, metal roof insulation, etc., and cushioning materials such as kitchen mats, bath mats, automobile interior materials, etc. Widely used in.

  Polyolefin foam that has been crosslinked by ionizing radiation using an azo-based pyrolytic chemical foaming agent that can finely control the foam shape of the foam has particularly low thermal conductivity, and in the fields of heat insulation, cold insulation and heat insulation. Preferably used. However, the azo-based thermally decomposable chemical foaming agent generates ammonia during the decomposition process, and when the polyolefin-based foam is installed in a sealed space, it sometimes exhibits an ammonia odor. In addition, there is a case where the surroundings of the pipe heat insulating material arranged indoors and outdoors are in a high humidity state due to the influence of rain water, water used in the kitchen, bath, laundry, etc. and generate odor.

  In view of the background of such conventional technology, the present invention suppresses the odor of polyolefin resin foam using an azo-based pyrolytic chemical foaming agent and the odor including the surroundings in the environment where the foam is used. An object of the present invention is to provide a polyolefin-based resin laminate foam that can be used.

  The present invention employs the following means in order to solve such problems. That is, it is a polyolefin resin laminated foam having a deodorizing function, wherein a polyolefin resin layer containing at least a deodorizer is provided on at least one surface of the polyolefin resin foam.

  By using the foam of the present invention, the environment in which the polyolefin resin foam is used in applications that utilize the functions of the polyolefin resin foam, such as heat retention, cold insulation, heat insulation, buffering, and impact resistance. In the case of having an odor in the atmosphere of the environment, the odor can be reduced, and in particular, a long-term effect can be imparted by including a deodorant in the polyolefin resin. .

  The polyolefin-based resin laminate foam having a deodorizing function of the present invention provides a deodorizing agent to at least one surface of the foam in order to give the polyolefin-based resin foam a function to reduce odor efficiently and in the long term. It is necessary to provide a polyolefin-based resin layer. Such a deodorant has a removal effect due to a chemical reaction such as a reaction mechanism such as oxidation or reduction, or a neutralization mechanism of acid / alkali, and has a removal effect. , To reduce the odor caused by the growth of bacteria. The bad odors shown here are roughly classified into basic, acidic, aldehyde-based, and sulfur-based gases. Specific examples of basic gases include ammonia, pyridine, trimethylamine, and the like, and acidic gases include acetic acid and isovaleric acid. Butyric acid and the like are exemplified, acetaldehyde, formaldehyde, 2-nonal and the like are exemplified as the aldehyde-based gas, and hydrogen sulfide, methyl mercaptan and the like are exemplified as the sulfur-based gas.

  Deodorants used in the present invention include inorganic compounds and organic compounds. In inorganic compounds, silicate compounds having silver ions and zinc ions, phosphate compounds having silver ions and zinc ions, silver ions and zinc ions are used. Examples include calcium phosphate compounds having a particle diameter of 50 nm or less, and organic compounds include compounds having a hydroxy group bonded to an aromatic ring such as a plurality of benzene rings or naphthalene rings in the molecule. Specifically, 2,4,4′-trichloro-2′-hydroxydiphenyl ether, 4,4′-dichloro-2hydroxyphenyl ether, 4-isopropyltropolone, polyphenols and the like are exemplified. Examples of the polyphenols shown here include flavonol, isoflavone, tannin, kentin, catechin, proanthocyanidin and the like. The above deodorants may be used alone or in combination of two or more. The total amount of the deodorant used alone or in combination of two or more is preferably from 1 to 30 parts by weight, more preferably from 2 to 20 parts by weight, based on 100 parts by weight of the polyolefin resin. If the amount added is less than 1 part by weight, the deodorizing performance may be inferior or uniform dispersion may be difficult. On the other hand, if the amount added exceeds 30 parts by weight, poor dispersion during kneading, kneading failure, and various rolls of processing equipment Problems such as process instability due to adhesion to the surface may occur.

  Such a deodorant is preferably subjected to a known treatment on the surface of the deodorant in order to improve dispersibility and adhesion to the polyolefin resin, for example, a surface treatment agent having an organic functional group such as a silane coupling agent, A coating agent such as a wax emulsion, a dispersing agent such as a copolymer polymer or an ester may be used.

  The polyolefin resin used in the present invention is a polymer or copolymer of an olefin hydrocarbon. The polyolefin resin is not particularly limited. For example, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-diene copolymer, ethylene-propylene-diene terpolymer, ethylene-octene copolymer Examples include coalescence, low density polyethylene, linear polyethylene copolymerized with ethylene and α-olefin having 4 to 12 carbon atoms, high density polyethylene, polypropylene, ethylene-propylene copolymer, olefin-based thermoplastic elastomer, etc. Each can be used alone or in combination of two or more. The α-olefin copolymerized with ethylene is not particularly limited. For example, propylene, 1-butene, 1-pentene, 3,3-dimethyl-1-butene, 4-methyl-1-pentene, 4,4-dimethyl- 1-pentene, 1-decene, 1-dodecene, 1-tetradecene, 1-octadecene and the like are preferable.

  The melting point of the polyolefin resin is desirably 80 ° C. to 150 ° C., and more preferably 90 ° C. to 140 ° C. If the melting point is less than 80 ° C., a significant change in dimensions or the like may occur at a general use environment temperature, or a defect such as a surface defect or a molding defect may occur due to melting at an early stage in a molding process involving heating. . On the other hand, when the melting point exceeds 150 ° C., for example, when the deodorant is kneaded with heating such as melting and kneading, the deodorant is decomposed due to the processing temperature, or the molding process with heating is performed. May be partially decomposed and the deodorizing function may be reduced.

  Polyolefin resins include, for example, polyethylene resins having ethylene as the main chain or copolymers thereof, polypropylene resins having propylene as the main chain or copolymers thereof, and the measurement temperature of the melt flow rate (MFR) is It is mainly related to the components that form the main chain and the melting point. Polyethylene resin having ethylene as the main chain or a copolymer thereof having a melting point of 100 to 140 ° C. used for polyolefin resin is 0.1 to 50 g / 10 min in MFR measured at 190 ° C. Is preferable, and it is more preferable that it is 1-30 g / 10min. When the MFR is less than 0.1 g / 10 min, when producing a film-like polyolefin resin layer with an extruder or the like, the productivity decreases due to excessive kneading pressure, the deodorant decomposes or disperses poorly, or the width due to discharge fluctuation In some cases, defects such as a thickness failure in the direction and the longitudinal direction may occur. On the other hand, if it exceeds 50 g / 10 minutes, a thickness adjustment failure in the width direction due to insufficient kneading pressure and a dispersion of the deodorant may occur.

  In addition, a polypropylene resin having a main chain of propylene having a melting point of 130 ° C. to 160 ° C. or a copolymer thereof used in a polyolefin resin is 0.1 to 50 g / 10 min in MFR measured at 230 ° C. It is preferable that it is 0.3-30 g / 10min. When the MFR is less than 0.1 g / 10 min, when producing a film-like polyolefin resin layer with an extruder or the like, the productivity decreases due to excessive kneading pressure, the deodorant decomposes or disperses poorly, or the width due to discharge fluctuation In some cases, defects such as a thickness failure in the direction and the longitudinal direction may occur. On the other hand, if it exceeds 50 g / 10 minutes, a thickness adjustment failure in the width direction due to insufficient kneading pressure and a dispersion of the deodorant may occur. The MFR shown here is measured by a measuring method according to JIS K 6922-2 and JIS K 6921-2. The melting point shown here is obtained from a DSC curve measured by differential scanning calorimetry, and the measuring method is as follows.

  Using a differential scanning calorimeter, the temperature was raised between −50 ° C. and 200 ° C. at a rate of 10 ° C./minute, held at 200 ° C. for 5 minutes, and then between 200 ° C. and −50 ° C. at 10 ° C./minute. The DSC curve was melted at the second temperature increase after the temperature was decreased at a rate of 5 ° C. and held at −50 ° C. for 5 minutes and then increased at a rate of 10 ° C./min between −50 ° C. and 200 ° C. The peak temperature is taken as the melting point.

  The polyolefin resin foam used in the present invention is a mixture of a polyolefin resin and a gas, and its production method is not particularly limited, but foams while melting a gas or a solvent to be vaporized in an extruder and extruding under high pressure. Extrusion foaming method, bead foaming method in which resin particles containing gas or vaporizing solvent are pre-foamed and then foamed and fused in a mold, gas is dissolved in polyolefin resin in a high-pressure vessel, and heated at normal pressure to foam Solvent diffusion method such as gas impregnation method, normal pressure foaming method by melting and kneading polyolefin resin and thermal decomposition type chemical foaming agent and foaming by normal pressure heating, thermal decomposition of thermal decomposition type chemical foaming agent in the extruder and high pressure Examples thereof include an extrusion foaming method in which foaming is performed while extruding under pressure, and a foaming agent decomposing method in which a thermally decomposable chemical foaming agent is thermally decomposed in a press mold and foamed while being decompressed.

  The gas used in the solvent diffusing method or the solvent to be vaporized is not particularly limited. For example, there are various organic and inorganic types, and examples of the organic physical foaming agent include propane, normal butane, isobutane, normal pentane, and isopentane. Aliphatic hydrocarbons such as normal hexane, isohexane, cyclohexane, cycloaliphatic hydrocarbons such as cyclopropane, cyclobutane, cyclopentane, cyclofluoromethane, dichlorodifluoromethane, dichlorotetrafluoroethane, trichlorofluoromethane, tetrafluoro Halogenated hydrocarbons such as ethane are exemplified, and examples of the inorganic physical foaming agent include carbon dioxide, nitrogen, helium and the like, and each can be used alone or in combination of two or more.

  The pyrolytic chemical foaming agent used in the foaming agent decomposing method is not particularly limited as long as it is a chemical foaming agent that decomposes and releases gas when heat is applied. For example, there are various organic and inorganic types. Organic systems include azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, P.I. Examples of inorganic systems such as P′-oxybenzenesulfonyl hydrazide include sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, calcium azide, etc., which can be used singly or in combination of two or more, as necessary. You may add foaming adjuvants, such as urea which improves the decomposability | degradability of a thermal decomposition type foaming agent, the metal salt of a fatty acid, and zinc white.

  Polyolefin resin foam is foamed by kneading organic peroxides such as electron beam cross-linking method, dicumyl peroxide, tertiary butyl perbenzoate, di-tert-butyl peroxide, etc. A polyolefin resin cross-linked foam using a method such as a chemical cross-linking method in which the organic peroxide is sometimes decomposed and cross-linked, or a silane cross-linking method in which a polyolefin resin having a silane group is mixed and brought into contact with heated moisture is used. It is also possible to use a crosslinking aid such as divinylbenzene or trimethylolpropane trimethacrylate that improves the crosslinking properties as necessary.

  The polyolefin resin foam used in the present invention preferably has a thickness of 0.5 to 500 mm, more preferably 3 to 100 mm. If the thickness is less than 0.5 mm, performance such as heat retention, cold insulation, heat insulation, cushioning, and cushioning properties will be remarkably lowered. However, if the thickness exceeds 500 mm, the thermal insulation performance and impact resistance are satisfied, but problems such as reduced processing characteristics and productivity, and increased prices may occur. is there. The thickness shown here indicates a numerical value measured by a measurement method according to JIS K-7222.

The apparent density of the polyolefin resin foam used in the present invention is preferably 20 to 200 kg / m ^3, more preferably 25 to 50 kg / m ³ . When the apparent density is less than 20 kg / m ³ , mechanical properties such as compression characteristics and high elongation may be deteriorated, resulting in insufficiency in heat insulation performance and processing characteristics, while when the apparent density exceeds 200 kg / m ³ , Insulation performance may be significantly reduced, and the required thermal insulation and cold insulation temperature characteristics may not be satisfied. The thickness and the apparent density shown here indicate numerical values measured by a measuring method according to the 2001 edition JIS K-7222.

  In the polyolefin resin laminated foam having a deodorizing function of the present invention, the method of laminating the polyolefin resin layer to which the deodorant is added and the polyolefin resin foam is not particularly limited, and it is laminated using a known method. May be. As a specific lamination method, a polyolefin-based resin having a deodorizing function, which has been formed into an unstretched film by a known extruder such as a single-screw extruder or a twin-screw extruder using a T-die or a calender roll in advance. A method of laminating a layer with a polyolefin resin foam via a known liquid, gel or solid adhesive such as a solvent or water, or a known adhesive tape, heating with a known heat source such as hot air or a heater, flame After melting the surface of the polyolefin resin foam by treatment, etc., it was extruded into a film using a method of welding with the resin layer previously molded into an unstretched film, or a known extruder using a T-die. A method of laminating the resin layer with a polyolefin resin foam at the same time by cooling and pressing is exemplified.

  In particular, in order to efficiently impart a deodorizing effect, a method that does not use an adhesive or the like is preferable. A resin obtained by melt-kneading a polyolefin-based resin and a deodorant with a known extruder or the like, and extruding it into a film with a T-die A method in which the layers are simultaneously laminated with a polyolefin resin foam by cooling and pressing is preferred. Further, it is preferable that the polyolefin resin layer and the main resin of the polyolefin resin foam are made the same so that strong fusion is possible and stable lamination is possible. Here, the main resin indicates a resin component exceeding 50% when plural kinds of polyolefin-based resins are mixed.

  In addition, such foam has a work efficiency during construction such as an effect of reducing scratches by reducing the contact area with the article, an anti-slip effect during manual work, or a design improvement effect that makes surface wrinkles less noticeable when curved. In order to improve this, it is desirable to provide a regular uneven shape on at least one side of the polyolefin resin layer. The method of providing the regular uneven shape is not particularly limited, but after heating the polyolefin resin layer side of the polyolefin resin laminated foam having the deodorizing function prepared by the above method with a known heat source such as hot air or a heater, The method of transferring the regular uneven shape of the roll to the resin layer by pressing a roll surface arranged on the resin layer side with a metal roll engraved in a regular uneven shape, and the resin layer in a molten state using an extruder or the like Is a method of transferring the regular concavo-convex shape of the roll to the resin layer by pressurizing the roll surface arranged on the resin layer side with a metal roll engraved with a regular concavo-convex shape when cooling and pressing with a polyolefin resin foam Illustrated.

  The thickness of the polyolefin resin layer having a deodorizing function of the present invention is preferably 0.01 to 2 mm, and more preferably 0.05 to 1 mm. If the thickness is less than 0.01 mm, the frequency of occurrence of scratches and tears may increase depending on handling, and workability may be reduced. On the other hand, if the thickness exceeds 2 mm, the foam properties such as lightness, flexibility, and cushioning are remarkably increased. In some cases, the workability may be lowered due to the reduction or high rigidity. Such a polyolefin resin layer is preferably unstretched so that it can be heated and molded into a predetermined shape after being laminated with a polyolefin resin foam.

  The polyolefin resin laminated foam having a deodorizing function according to the present invention is, for example, a flame retardant, a flame retardant aid, a dispersant, a pigment, a mold release agent, a nucleating agent, an ultraviolet absorber, and a light stabilizer. Various known additives such as those may be added to the polyolefin resin layer and / or the polyolefin resin foam. Of the above-mentioned additives, organic additives may reduce the deodorizing function by thermal decomposition or the like, so addition of less than 5 parts by weight with respect to 100 parts by weight of the polyolefin-based resin is preferable. In addition, since inorganic additives may reduce mechanical properties such as tensile strength and tear strength, addition of less than 30 parts by weight with respect to 100 parts by weight of polyolefin resin is preferable.

  The polyolefin-based resin laminated foam having a deodorizing function of the present invention is a coating that conforms to the shape of the pipe in order to efficiently keep warm, cool, and prevent dew condensation of a fluid object such as gas or liquid flowing in the pipe. It is desirable to use a cylindrical body. The method of making the foam into a cylindrical body is not particularly limited. For example, the foam laminated by the above-described method is cut into a width corresponding to the diameter of the cylinder, and the foam is removed with a known heat source such as hot air or an infrared heater. A method of passing a cone-shaped base while heating, or cutting a polyolefin resin foam into a width corresponding to the diameter of the cylinder, and heating the foam with a known heat source such as hot air or an infrared heater while heating the foam A polyolefin resin layer having a deodorizing function formed into an unstretched film cut into an appropriate width after being made into a cylindrical body through a solvent, a water-based liquid, gel, or solid known adhesive The method of adhering with an agent or a well-known adhesive tape is illustrated.

  In addition, pipes that require heat insulation, cold insulation, anti-condensation, joints, flow control parts such as valves, etc. Is preferably molded and coated into a predetermined shape equivalent to the portion. A method for forming such a foam into a molded body having a predetermined shape is not particularly limited. For example, the foam laminated by the above method is heated with a known heat source such as a circulating hot air oven or an infrared heater, and then a metal having fine holes. An example is a method in which the foam is placed on a predetermined mold such as made or wooden, the air is extracted from the fine holes, and the foam and the predetermined mold are brought into close contact with each other.

  Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are merely examples and are not particularly limited.

  The deodorant evaluation criteria in the present invention are as follows.

Ammonia gas deodorization test method Prepare a test piece cut into a 100 mm square and put it in a tedlar bag and seal it by heat sealing. Was allowed to stand at room temperature for 3 hours. After being allowed to stand, each concentration was measured with a gas detector tube (manufactured by Gastec Co., Ltd., 3La detector tube was used).
As the method for adjusting the ammonia gas used here, 2 g of 28% ammonia water special grade reagent (manufactured by Nacalai Tex Co., Ltd.) and 5 liters of air were enclosed in a Tedlar bag and left at room temperature for 3 hours.

Acetic acid gas deodorization test method A test body cut into a 100 mm square was put in a Tedlar bag and sealed by heat sealing, and prepared in the same manner except that the test body was not put, and each prepared 3 liters of acetic acid gas Was allowed to stand at room temperature for 3 hours. After being allowed to stand, each concentration was measured with a gas detector tube (manufactured by Gastec Co., Ltd., using 81 detector tube).
As a method for adjusting the acetic acid gas used here, 0.5 g of acetic acid special grade reagent (manufactured by Nacalai Tex Co., Ltd.) and 5 liters of air were enclosed in a Tedlar bag and left at room temperature for 3 hours.

Judgment method The percentage of the numerical value divided by the gas concentration of the specimen with or without the specimen (hereinafter referred to as the residual gas ratio) is the value of the ammonia gas deodorization test method and the acetic acid gas deodorization test method. In both cases, 95% or less is judged as pass (◎), and if either test is 95% or less, it is judged as pass (○), and if both tests exceed 95%, it is judged as fail (x). did.

[Example 1]
50 parts by weight of high pressure method low density polyethylene (Petrocene 310 manufactured by Tosoh Corporation) having an MFR of 3.6 g / 10 min and a density of 0.922 g / cm ^3, an MFR of 3.0 g / 10 min, and a density of 0.935 g / 50 parts by weight of cm ³ linear low-density polyethylene (Nipolon-LM50 manufactured by Tosoh Corporation) was pulverized to 2 mm or less using a pulverizer, respectively, and then pyrolyzed chemical foaming agent azodicarbonamide (Yewa Kasei Kogyo Co., Ltd.). Binihol AC # 1) 10.5 parts by weight, antioxidant pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (Ciba Specialty Chemicals) IRGANOX1010) 90mmφ single screw extrusion mixed 0.3 parts by weight with a super mixer and heated to 140-160 ° C After forming into a long sheet with a thickness of 1.8 mm using a T-die, 70 kGy electron beam was irradiated at an acceleration voltage of 800 kV, crosslinked, and then heated with a vertical hot air foaming device heated to 240 ° C. After heating for 3 minutes, a long foam having a thickness of 4.3 mm and an apparent density of 31 kg / m ³ was obtained.

Silicic acid having silver ions and zinc ions as a deodorant in 100 parts by weight of linear low density polyethylene (Nipolon-LM50 manufactured by Tosoh Corporation) having an MFR of 3.0 g / 10 min and a density of 0.935 g / cm ³ After melt-kneading 20 parts by weight of a salt compound (Zeomic manufactured by Sinanen Zeomic Co., Ltd.) with a 40 mmφ twin-screw extruder heated to 130 to 150 ° C., and extruding from a nozzle, a rod-like strand having a diameter of 2 mm is formed, and after water cooling Cutting to a length of 3 mm gave a deodorant resin composition. Immediately after the deodorant resin composition is put into a 65 mmφ single screw extruder heated to 140 to 160 ° C. and extruded into a sheet through a T-die, the gap with the long foam is reduced to half of the foam thickness. The polyolefin-based resin laminated foam having a deodorizing function was obtained through the two adjusted rolls. The average value of the thickness of the resin layer measured at this time with a 5-point caliper in the width direction was 0.15 mm.

  As shown in Table 1, the polyolefin resin laminated foam having the deodorizing function obtained by the above method has a residual gas rate of 89% for ammonia gas and a residual gas rate for acetic acid gas of 82%. there were.

[Example 2]
After pulverizing 100 parts by weight of high pressure method low density polyethylene (Petrocene 310 manufactured by Tosoh Corporation) having an MFR of 3.6 g / 10 min and a density of 0.922 g / cm ³ to 2 mm or less, pyrolysis-type chemistry Foaming agent azodicarbonamide (Vinole AC # 1 manufactured by Eiwa Chemical Industries Ltd.) 3.5 parts by weight, antioxidant pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) Propionate] (IRGANOX1010 manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.3 parts by weight was mixed with a super mixer and heated to 140 to 160 ° C. with a 90 mmφ single screw extruder using a T die and a thickness of 1.8 mm. After forming into a long sheet shape, 70 kGy electron beam is irradiated at an acceleration voltage of 800 kV to crosslink, and then heated to 240 ° C. A polyolefin-based resin laminated foam having a deodorizing function in the same manner as in Example 1 except that it was heated in a vertical hot air foaming apparatus for 2 to 3 minutes to obtain a long foam having a thickness of 2.7 mm and an apparent density of 105 kg / m ^3. Got the body. The average value of the thickness of the resin layer measured at this time with a 5-point caliper in the width direction was 0.08 mm.
As shown in Table 1, the polyolefin resin laminated foam having the deodorizing function obtained by the above method has a residual gas ratio of ammonia gas of 92% and a residual gas ratio of acetic acid gas of 86%. there were.

[Example 3]
After pulverizing 100 parts by weight of high-pressure low-density polyethylene (Petrocene 207 manufactured by Tosoh Corporation) having an MFR of 8.0 g / 10 min and a density of 0.925 g / cm ³ to 2 mm or less using a pulverizer, 15.5 parts by weight of a foaming agent azodicarbonamide (Vinole AC # 1 manufactured by Eiwa Chemical Industry Co., Ltd.), antioxidant pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) Propionate] (IRGANOX1010 manufactured by Ciba Specialty Chemicals Co., Ltd.) 0.3 parts by weight was mixed with a super mixer and heated to 140 to 160 ° C. with a 90 mmφ single screw extruder using a T die and a thickness of 1.8 mm. After forming into a long sheet shape, it is irradiated with an electron beam of 60 kGy at an acceleration voltage of 800 kV, crosslinked, and then heated to 240 ° C. A polyolefin-based resin laminated foam having a deodorizing function in the same manner as in Example 1 except that it was heated for 2-3 minutes with a vertical hot-air foaming apparatus and made into a long foam having a thickness of 5.2 mm and an apparent density of 21 kg / m ^3. Got the body. The average value of the thickness of the resin layer measured at this time with a 5-point caliper in the width direction was 0.18 mm.
As shown in Table 1, in the polyolefin resin laminated foam having the deodorizing function obtained by the above method, the residual gas rate of ammonia gas is 96%, the residual gas rate of acetic acid gas is 92%, and the pass (◯) judgment is made. there were.

[Example 4]
A polyolefin-based resin laminate foam having a deodorizing function was obtained in the same manner as in Example 1 except that the amount of deodorant added was 2 parts by weight. The average value of the thickness of the resin layer measured at this time with a 5-point caliper in the width direction was 0.13 mm.

  As shown in Table 1, in the polyolefin resin laminated foam having the deodorizing function obtained by the above method, the residual gas rate of ammonia gas was 97%, and the residual gas rate of acetic acid gas was 93%. there were.

[Example 5]
10 parts by weight of tannin (Matsuo Pharmaceutical Co., Ltd. Pancil) as a deodorant in 100 parts by weight of high-pressure low-density polyethylene (Tosoh Corporation Petrocene 202) having an MFR of 24 g / 10 min and a density of 0.918 g / cm ³ Is melt-kneaded with a 40 mmφ twin screw extruder heated to 120 to 140 ° C., extruded from a nozzle to form a rod-like strand having a diameter of 2 mm, and after water cooling, is cut to a length of 3 mm to obtain a deodorant resin composition. In the same manner as in Example 1, a polyolefin resin laminated foam having a deodorizing function was obtained. The average value of the thickness of the resin layer measured at this time with a 5-point caliper in the width direction was 0.10 mm.
As shown in Table 1, the polyolefin resin laminated foam having the deodorizing function obtained by the above method has a residual gas ratio of ammonia gas of 91% and a residual gas ratio of acetic acid gas of 92%. there were.

[Example 6]
The polyolefin-based resin laminate foam having a deodorizing function of Example 1 was cut into a width of 100 mm, and molded into a cylindrical shape while blowing hot air at 180 ° C. into a conical base having a minimum diameter of 34 mm. The sample for the gas deodorization test was a cylinder cut to a length of 100 mm.

  As shown in Table 1, the polyolefin resin laminated foam having the deodorizing function obtained by the above method has a residual gas ratio of ammonia gas of 91% and a residual gas ratio of acetic acid gas of 92%. there were.

[Example 7]
The polyolefin-based resin laminated foam having a deodorizing function of Example 1 was heated in a hot air oven at 150 ° C. for 3 minutes, and vacuum molded with a cylindrical female mold having a diameter of 180 mm and a depth of 50 mm. A sample for the gas deodorization test was cut into a 100 mm square from the bottom of the cylinder to obtain a test specimen.

  As shown in Table 1, in the polyolefin resin laminated foam having the deodorizing function obtained by the above method, the residual gas rate of ammonia gas was 88%, and the residual gas rate of acetic acid gas was 93%. there were.

[Comparative Example 1]
A polyolefin resin laminated foam having a deodorizing function was obtained in the same manner as in Example 1 except that no deodorant was used. The average value of the thickness of the resin layer measured at this time with a 5-point caliper in the width direction was 0.11 mm.
As shown in Table 1, the polyolefin resin laminated foam having a deodorizing function obtained by the above method has a gas residual rate of 100% and a gas residual rate of acetic acid gas of 100%, which is rejected (x). Met.

  As described above, the polyolefin resin laminated foam having a deodorizing function according to the present invention shown in the examples is at least deodorized with respect to 100 parts by weight of the polyolefin resin on the surface of at least one surface of the polyolefin resin foam. It can be obtained by providing a polyolefin resin layer containing 1 to 30 parts by weight of the agent.

Claims (4)

A polyolefin-based resin laminated foam having a deodorizing function, wherein a polyolefin-based resin layer containing at least a deodorant is provided on at least one surface of the polyolefin-based resin foam. The polyolefin resin laminated foam having a deodorizing function according to claim 1, wherein the deodorizer is 1 to 30 parts by weight with respect to 100 parts by weight of the polyolefin resin of the polyolefin resin layer. A cylindrical body made of a polyolefin-based resin laminated foam having a deodorizing function according to claim 1 or 2. The molded object which consists of a polyolefin-type resin laminated foam which has a deodorizing function of Claim 1 or 2.