JP2003128798A - Biodegradable resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biodegradable resin molded product capable of maintaining various functions and performances required as resin components or parts, having enough heat resistance so as not to cause deformation, nor to cause any adverse effects on functions or performances of neighboring components and parts, but to sufficiently exhibit the functions required as the components or the parts even when exposed to an atmosphere of a high temperature, scarcely giving bad smell so as not to cause reduction of commercial value nor utility value of an article into which the product is built, capable of being reused and not having any adverse effects on the environment when wasted. SOLUTION: This biodegradable resin molded product is formed out of a molding material containing the biodegradable resin, wherein the molding material contains a smelly substance-adsorbing material in an amount of 0.5-30 mass%.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable resin molded product. In recent years, members constituting many industrial products,
Depending on the required functions, performance, properties, etc.,
A resin molded product is used in which a molding material made of various resin materials alone or in combination is molded into a required shape. For example, a member such as a container, casing, lid, spool, winding core or the like for storing, packaging, covering, protecting, transporting, storing or maintaining the form of a recording material such as a photographic recording material, a magnetic recording material, an optical recording material, or the like For parts and parts such as cassette cases,
Various resin molded products are used. In addition, as a member for storing the recording material body, cassettes, magazines, film cases with lenses, etc., or containers for simply protecting the recording material, storage cases such as audio cassette tapes and video tapes, storage cases such as CDs, MDs, etc. For example, resin molded products made of various resin materials are used. By the way, most of these resin molded products are discarded when the industrial product in which the resin molded product is incorporated is discarded after its role, or after the resin molded product performs its function. If it is processed or can be reused, it is separated and reproduced. For example, resin molded products such as various members or parts constituting the recording material
Separated and discarded during use of recording material,
Further, it is discarded along with the recording material to be discarded. However, conventional resin molded products are difficult to decompose in the natural environment when discarded, and this is one factor that pollutes the environment. Therefore, in recent years, it has been studied to use a molded product made of a material that can be decomposed in a natural environment.
Various types of biodegradable resins such as polylactic acid and modified starch are known as resin materials that can be decomposed in such a natural environment. Since these biodegradable resins are finally decomposed by microorganisms in the natural environment even if discarded, they do not have an adverse effect on the environment, and are therefore environmentally friendly resin materials. However, conventionally known biodegradable resins are heated to be molded into members, parts, etc., or are incorporated into the article as members or parts and then exposed to a high temperature atmosphere. An unpleasant odor may be emitted due to decomposition or modification of the functional resin itself, or volatilization or decomposition of impurities contained in the resin or unreacted substances during polymerization or unreacted substances of the modifier. For example, a modified starch resin conventionally known as a biodegradable resin may emit an unpleasant odor due to heating during molding. Thus, when a molded product that emits an odor is incorporated into an industrial product as a member, part, or the like, the commercial value of the industrial product may be impaired or the use value may be reduced. SUMMARY OF THE INVENTION An object of the present invention is to maintain various functions and performances required as a resin member or component and to have sufficient heat resistance, so that even when exposed to a high temperature atmosphere. An article that does not cause deformation or the like, does not adversely affect the function or performance of surrounding members, parts, etc., can sufficiently perform the function required as a member or part, and incorporates the part etc. due to an unpleasant odor To provide a biodegradable resin molded product that does not cause the product value, use value, etc. of the product to be reduced, can be reused, and does not adversely affect the environment when discarded. . In order to solve the above-mentioned problems, the present invention provides a resin molded article comprising a molding material containing a biodegradable resin, wherein the molding material is 0.5 to 30% by mass. A biodegradable resin molded product characterized by comprising an odorant adsorbing material. The biodegradable resin molded article of the present invention will be described in detail below. In the present invention, the resin molded product is a structural member that constitutes a functional material, or a container, lid, and accompanying accessory used for storage, packaging, covering, protection, transportation, storage, form support, etc.
Alternatively, it refers to a molded product that is molded to load the functional material and exert its function. For example, the functional material refers to various recording materials. For example, recording materials include negative film, reversal film, photographic paper,
Photographic materials such as monosheet or peel-apart instant photographic films, magnetic recording materials such as audio cassette tapes, magnetic recording materials such as video cassette tapes, flexible disks, magnetic tapes for computer data recording, CDs, CD-Rs, CD-RW, DV
An optical recording material such as D, DVD-R, DVD-RW, and MD. As a specific example of the resin molded member, a recording material resin member is a container for storing, packaging, coating,
A container used for protection, transportation, storage, form support, and the like, a lid and accompanying accessories, or various members that perform functions when loaded with the recording material. Specifically, 135, 110, 120 for photographic photosensitive materials,
Constituent members (eg, container main body, light shielding sheet, elastic plate, flexible light shielding sheet, etc.) This refers to various members such as a light shielding piece, a bottom light shielding sheet and the like, a housing for a film with a lens, and a mechanical part. For magnetic recording materials, an audio cassette tape, a video cassette tape, a magnetic tape for computer data recording, a cassette housing for storing a flexible disk, etc., its component parts, and a case for storing them. In optical recording materials, MD cassettes and CDs,
CD-R, CD-RW, DVD, DVD-R, DVD-
A case for storing RW, MD, and the like. The molded article of the present invention comprises a molding material containing a biodegradable resin as a main material and further containing an odor substance adsorbing material. In the present invention, the biodegradable resin refers to a resin that is finally decomposed into inorganic substances such as water and carbon dioxide by the action of microorganisms existing in nature.
1, a resin exhibiting biodegradability whose test method is described in ISO 14852 or ISO 14855. I
In SO14851 and ISO14852, biodegradability in an aerobic water system is prescribed. In ISO14851, the decomposition rate is obtained from oxygen consumption and in ISO14852 from the amount of carbon dioxide generated, and the decomposition rate is 60% or more in a maximum of 6 months. What you reach. ISO 14855 refers to a substance that decomposes 70% or more in a maximum of 6 months from the amount of carbon dioxide generated under composting conditions. Specific examples of the biodegradable resin include polylactic acid, modified starch resin, polycaprolactone, β-hydroxybutyric acid (3HB) and β-hydroxyvaleric acid (3H).
V) copolyester, cellulose acetate / glycerin acetate, polyhydroxybutyric acid, polyvinyl alcohol,
Examples include polybutylene succinate, polybutylene succinate adipate, polyethylene succinate, polyester amide, vinyl acetate and the like. In the present invention, these biodegradable resins may be used singly or in combination of two or more. In the present invention, the odorous substance adsorbent which is an essential component of the molding material is an odorous substance produced by the decomposition or modification of the biodegradable resin or other components in the molding material forming the molded article after molding. If it can adsorb | suck and deodorize, it will not restrict | limit in particular. For example, charcoal, bamboo charcoal, activated carbon, zeolite, silica gel, diatomaceous earth, white clay, barley stone, montmorillonite, or metal oxides such as activated alumina, titanium oxide, zinc oxide, zirconium oxide, magnesium oxide, iron oxide, iron hydroxide , Calcium phosphate compounds such as hydroxyapatite and zirconium phosphate, ferrous sulfate, and mixtures of zinc compounds such as zinc oxide and zinc carbonate with organic carboxylic acids. Activated carbon is made of coconut shell, wood carbide, lignite,
Any of those obtained from coal such as peat or petroleum pitch can be used. The form of the activated carbon is not particularly limited, and activated carbon fiber, bead activated carbon, honeycomb, felt, activated carbon paper, film, cylindrical activated carbon, and the like can be used. In the present invention, these odorous substance adsorbents can be used singly or in combination of two or more according to the odorous substance produced from the molded product. In addition, various additives can be blended in the molding material as required. For example, glass fiber, carbon fiber, silicon carbide fiber, alumina fiber, inorganic fiber such as silicon nitride fiber, reinforcing fiber such as organic fiber such as aramid fiber, bamboo fiber, agave fiber, etc., light shielding property such as carbon black Fillers, slidability improvers such as silicone oil, colorants such as pigments, crystal nucleating agents such as talc and barium sulfate, antioxidants, antibacterial agents, antifungal agents,
A foaming agent, an ultraviolet absorber, a flame retardant, an antistatic agent, a plasticizer, and the like can be blended as necessary. These additives may be used alone or in a range that does not impair the object of the present invention.
It can mix | blend combining a seed | species or more. The molded article of the present invention is prepared by preparing a molding material containing a biodegradable resin, an odor substance adsorbing material, and various other components blended as required, and supplying the molding material to a molding machine. This can be done by molding into the required form. The molding method is not particularly limited, and can be performed by methods such as injection molding, extrusion molding, blow molding, inflation molding, and pressure molding. The method of adding the polylactic acid and the odorous substance adsorbent to the molding material is a method in which the biodegradable resin and the odorous substance adsorbent are mixed with a biaxial kneader, and the production process of the biodegradable resin, You may carry out in accordance with any methods, such as the method of mixing an odor substance adsorbent with decomposable resin, and pelletizing with a biaxial kneader.
At this time, it is also desirable to use an odorous substance adsorbent that has been surface-treated in order to improve compatibility with the biodegradable resin. In addition, the molded product of the present invention is sealed or encapsulated in a container or a packaging material, and the odorous substance evaporating from the molded product of the present invention is confined inside, so that the odorous substance adsorbing material is sufficiently absorbed. It would be desirable to be able to do so. As the container, for example, a synthetic resin such as polyethylene is used, a container formed by a molding method such as an injection molding method, a vacuum / pressure forming method, a blow molding method, etc., and a synthetic resin such as polyethylene is laminated on the surface, and a gas Examples include containers made of paper with reduced permeability,
Examples of the packaging material include a film or sheet made of a single synthetic resin such as polyethylene, a film or sheet made by laminating a plurality of types of synthetic resins, or a process such as vapor deposition or coating on the film or sheet. Film or sheet with reduced gas permeability, synthetic paper such as polyethylene is laminated on paper, and film or sheet with reduced gas permeability, or treatment such as vapor deposition or coating is applied to those films or sheets. And a packaging material made of a film or sheet with reduced gas permeability. In addition, if these containers or packaging materials are formed of a biodegradable resin, even after the molded product of the present invention is taken out and discarded, the containers or packaging materials are finally decomposed by microorganisms in the natural environment. It has no adverse effect and is effective in reducing environmental impact. The present invention will be described more specifically with reference to the following examples and comparative examples. Example 1 Pure light (Nippon Pure Light, KH) as an odorant adsorbent on a modified starch resin (Nippon Corn Starch, Corn Pole M2)
Pellets prepared by kneading in advance at a ratio of 0.5% by mass were dried at a drying temperature of 80 ° C. for 4 hours using a hot air circulating dryer. The pellets were supplied to an injection molding machine (Sumitomo Heavy Industries, Ltd., SG100M-HP type) to produce an instant film pack frame and back cover. An instant film pack (INSTAX mini) in which an upper surface light-shielding sheet, an elastic plate, a flexible light-shielding sheet and a film unit, which are non-biodegradable members conventionally used, are incorporated in the frame and the back cover. Assembled. The instant film pack was placed in a tedlar bag and sealed. Example 2 An instant film pack frame and back cover were produced in the same manner as in Example 1 except that 10% by mass of purelite was used as the odorous material adsorbent. Using this frame and back cover, an instant film pack was assembled in the same manner as in Example 1 and sealed in a Tedlar bag. Example 3 An instant film pack frame and back cover were produced in the same manner as in Example 1 except that pure light was used in an amount of 30% by mass as the odorous material adsorbent. Using this frame and back cover, an instant film pack was assembled in the same manner as in Example 1 and sealed in a Tedlar bag. Example 4 An instant film pack frame and back cover were produced in the same manner as in Example 1 except that Secard D was used at a ratio of 10% by mass as the odorous substance adsorbent. Using this frame and back cover, an instant film pack was assembled in the same manner as in Example 1 and sealed in a Tedlar bag. (Comparative Example 1) Example 1 except that pure light was used in an amount of 0.2% by mass as the odorous material adsorbent.
In the same manner as described above, an instant film pack frame and back cover were manufactured, and an instant film pack was assembled using the frame and back cover. The resulting instant film pack was placed in a Tedlar bag and sealed. (Comparative Example 2) A frame and a back cover were produced in the same manner as in Example 1 except that pure light was used as a odorous substance adsorbing material in a proportion of 50% by mass. Attempts were made to assemble an instant film pack using, but the frame and back cover were fragile and cracked when force was applied, and the instant film pack could not be assembled into a tedlar back. Comparative Example 3 Polystyrene (Asahi Kasei Corporation)
The pellets of Styron 666) were supplied to an injection molding machine (SG100M-HP type, manufactured by Sumitomo Heavy Industries), and an instant film pack frame and back cover were manufactured in the same manner as in Example 1. Using this frame and back cover, an instant film pack was assembled in the same manner as in Example 1 and sealed in a Tedlar bag. Odor Evaluation In each example, the tedlar bag containing the instant film pack was left to stand in a dry thermostatic bath at 50 ° C. for one week, then taken out and subjected to sensory evaluation of the odor in the tedlar bag. The evaluation was based on the odor in the Tedlar pack containing the instant film pack obtained in Comparative Example 3, and was evaluated as “OK” if the odor in Comparative Example 3 was not unpleasant. [Table 1] The biodegradable resin molded product of the present invention retains various functions and performances required as a resin member or component and has sufficient heat resistance, so that it is exposed to a high temperature atmosphere. However, it does not cause deformation, etc., does not adversely affect the function or performance of surrounding members, parts, etc., can fully perform the functions required as members or parts, and parts are incorporated due to unpleasant odors It does not cause the product value, use value, etc. of the product to be reduced,
It can be reused and will not adversely affect the environment when discarded.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F071 AA08 AA09 AA28 AA29 AA43                       AA57 AB03 AB18 AB24 AB25                       AB26 AE22 AH04 AH05                 4J002 AB021 AB041 BE021 BF021                       CF031 CF191 CL081 DA016                       DE076 DE096 DE106 DE116                       DE136 DE146 DE246 DG046                       DH046 DJ016 DJ036

Claims (1)

What is claimed is: 1. A resin molded article comprising a molding material containing a biodegradable resin, wherein the molding material contains 0.5 to 30% by mass of an odorous substance adsorbent. Biodegradable resin molded product.