JPH09302244A - Biodegradable resin composition and biodegradable resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a biodegradable resin compsn. which can reduce the cost and can be composted in the disposal by comprising a biodegradable resin and a cotton waste. SOLUTION: This biodegradable resin compsn. comprises: at least one biodegradable resin, selected from among a lactic acid-based plastic, a biopolyester, an aliph. polyester and other biodegradable resins, in an amt. of 100 pts.wt.; and 10 to 100 pts.wt. cotton waste, such as cotton waste and/or thread waste. This compsn. may be molded into moldings for various applications.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin composition comprising a biodegradable resin and a natural material, cotton waste.
More specifically, along with effective utilization of cotton waste such as waste cotton waste and thread waste, the biodegradability that is reduced to the soil together with cotton waste by utilizing the characteristic that these are effective for plant growth. The present invention relates to a resin composition which is composed of a resin and is suitable for the production of an environmentally friendly biodegradable molded product which can be composted in a waste disposal process after use.

[0002]

2. Description of the Related Art Various kinds of plastics have been widely used for daily life and industry due to their various excellent properties, and their amounts have been remarkably increased. Also, with the increasing use of plastics, the amount of plastics discarded continues to increase,
At present, the annual amount of discarded plastics reaches 6.9 million tons.

However, most plastics do not decompose in the natural environment, and the impact on the environment due to the disposal of used plastics cannot be ignored. Steady studies on recycling, reuse, treatment methods, etc. of waste plastics have been continued, but there are many difficulties in recycling,
Only 1.99 million tons are recycled or incinerated to serve as an energy source, and the rest are used up in landfills without any use.

[0004]

In view of such circumstances, development of environmentally friendly biodegradable plastics has been vigorously carried out, and a large number of biodegradable plastics have come to be marketed. However, the price is much higher than that of conventional plastics, and it has not been fully used. Therefore, it is an object of the present invention to provide a biodegradable resin composition having a new function added while reducing the cost associated with the use of biodegradable plastics, and a resin molded product using the same. is there.

[0005]

The above object is achieved by the following invention. That is, the present invention is a biodegradable resin composition characterized by containing at least one biodegradable resin and cotton waste, and a biodegradable resin molded product comprising this resin composition. A biodegradable resin molded product using the above biodegradable resin composition has air permeability, water retention and the like, and is finally characterized by being decomposed by microorganisms and reduced into soil.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in more detail with reference to embodiments. The biodegradable resin used in the present invention is a resin that is decomposed by microorganisms in soil, compost, or the like, and is, for example, a lactic acid-based plastic that is a ring-opening polymer of lactide made from fermented lactic acid (for example, Shimadzu). Lacty manufactured by Mfg. Co., Ltd.), hydrogen bacterium Alcaligenes eutro
Copolymerized polyester containing 3-hydroxybutyrate and 3-hydroxyvalerate units, which are fermentatively synthesized by applying a linear organic acid with an odd carbon number such as propionic acid or valeric acid as a carbon source to phus or Bacillus megaterium Examples of biodegradable resins include biopolyesters (such as Biopol manufactured by ICI) and aliphatic polyesters obtained by condensation polymerization of glycol and aliphatic dicarboxylic acid (such as Bionole manufactured by Showa High Polymer Co., Ltd.) To be done.

In addition to the above, a resin which is biodegradable by complexation, for example, a blend of an autoxidation promoter having a carbon-carbon double bond such as granular starch and oleic acid, and LDPE (St. Lawrence, Canada) (Ecostar Co., Ltd., etc.), a completely gelatinized starch and a vinyl alcohol copolymer are dispersed and mixed at the molecular level, and a plasticizer is added to contain a natural product-derived component in an amount of 60% by weight or more. And (Matterby made by Novamont of Italy (MATER-BI)
Etc.), blends of corn and potatoes, which are main raw materials, and polyvinyl alcohol, etc. (NOVON, etc. manufactured by Warner-Lambert, USA).
Any of these biodegradable resins can be used in the present invention. These biodegradable resins are eventually decomposed into carbon dioxide and water by microorganisms in the soil.

From the viewpoint of effective utilization of waste, cotton waste, which is a natural material used in the present invention, is used cotton waste, cotton waste from a cotton mill, etc., yarn waste from a yarn mill, etc. Waste such as is suitable. However, the source of the cotton waste may be any source and is not particularly limited.

The resin composition of the present invention contains the above-mentioned biodegradable resin and cotton scraps. By mixing both components together with various additives in a usual mixer, if necessary. It can be manufactured. The cotton waste is used in the form of a chop or the like by appropriately selecting a form such as a cotton shape or a thread shape depending on the purpose of use of the resin composition and cutting or shredding if necessary.

Examples of the additives include fillers such as calcium carbonate and talc, foaming agents, coloring agents, antioxidants, plasticizers, lubricants, antifungal agents, etc. It can be appropriately selected and used according to the required performance, and the kind and amount of the additive are not particularly limited.

The mixing ratio of the cotton scraps to the biodegradable resin may be appropriately determined depending on the purpose (use) of the resin composition and is not particularly limited. If the proportion used is too low, the cost cannot be reduced and the air permeability of the molded article becomes insufficient. If it is used excessively, the production of the resin composition becomes difficult and the strength of the molded article decreases. Usually, it is in the range of 10 to 100 parts by weight with respect to 100 parts by weight of the biodegradable resin.

The resin molded product of the present invention comprises the above-mentioned resin composition of the present invention. The resin composition is kneaded and pelletized by using an ordinary mixer, for example, an extruder. The resin composition thus obtained is formed into a molded product having a predetermined shape by, for example, an extruder or an injection molding machine.
Alternatively, a sheet may be prepared from the resin composition and a molded product having a predetermined shape may be formed by vacuum molding or the like. In the present invention, the method for molding the resin molded body is not particularly limited.

The resin molding in the present invention is not particularly limited, but for example, a slope protection material formed in a mesh shape or a net shape, a root protection material in transplantation of trees, etc., a fixing material at the time of lawn planting and a grass protection material. Etc .; agricultural sheets or films; cushioning materials that are foamed to replace expanded polystyrene; various foam containers such as trays for meat, fish, vegetables, etc .; food packaging containers such as egg packs; golf tees and the like.

The molded article made of the resin composition of the present invention has air permeability, because the cotton waste mixed in the biodegradable resin forms a porous air flow passage. It happens. Further, since the cotton waste has a water absorbing property, when the molded product is a tray for meat, fish, etc., it can absorb the broth and the like. Furthermore, in the case of a vegetable tray, if moisture is absorbed in advance, evaporation of moisture from the vegetables can be suppressed and freshness can be maintained.

[0015]

EXAMPLES Next, the present invention will be described more specifically with reference to examples. Parts and percentages in the text are based on weight.

Example 1 Bionore # 1020 (Biodegradable resin manufactured by Showa High Polymer Co., Ltd.)
75 parts, 10 parts of cotton thread waste, 15 parts of charcoal and a fungicide (0.6% based on the composition) are uniformly mixed in a tumbler and put into an extruder to obtain a pelletized resin composition. It was made. An extruder equipped with a die for mesh formation was used to obtain the pelletized composition, and a mesh-shaped sheet having a rhombus mesh shape, a side length of about 2 mm and a diameter of about 0.5 mm was obtained. This mesh sheet had sufficient strength and was useful as a fixing material when planting grass, a slope protection material, and the like.

Example 2 In Example 1, Bionore # 1020 was replaced with Bionore #
Instead of 1003 (Showa High Polymer Co., Ltd. biodegradable resin), the mixture was uniformly mixed with a tumbler, then charged into an extruder and extruded from a T-die to prepare a sheet having a thickness of 0.2 mm. Using this sheet, an egg pack was produced by vacuum forming. Although it was a little opaque, there was no problem in strength, and it could be sufficiently put to practical use.

Example 3 Bionole # 1003 (Biodegradable resin manufactured by Showa High Polymer Co., Ltd.)
100 parts, 50 parts of cotton thread waste cut to a length of about 2 mm, and 0.8 parts of a foaming agent (sodium bicarbonate / monosodium citrate = 1/1) are uniformly mixed in a tumbler,
The mixture was put into an extruder, and extrusion foaming was performed from a T die while press-fitting n-butane. A foamed sheet having a thickness of 20 mm and a foaming ratio of 20 times was obtained. This material was sufficiently resistant to compression, had no problem in strength, and could be used as a cushioning material.

[0019]

EFFECTS OF THE INVENTION According to the present invention described above, biodegradability capable of producing a resin molded product in which cotton waste is blended with a biodegradable resin and which is provided with reinforcement by cotton waste, water retention, air permeability and the like. A resin composition is provided. By utilizing the waste cotton waste, it is possible to reduce the cost of using the biodegradable resin. In addition, the molded product using the above biodegradable resin composition is recyclable and can be composted with a composter, which is environmentally friendly and does not cause a problem of waste treatment. . The molded product itself is reinforced with cotton scraps and imparted with breathability (porosity) and water retention by the cotton scraps, and thus can be used in various applications requiring these properties.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 596065603 Masao Hatanaka 3-14 Wakamiya-cho, Izumisano-shi, Osaka (71) Applicant 591250835 Intick Art Co., Ltd. 2-18-11 Dogenzaka, Shibuya-ku, Tokyo Sun MALL Dogenzaka No. 418 (72) Inventor Akiyoshi Kameoka 2-18-11-418 Dogenzaka, Shibuya-ku, Tokyo Intic Art Co., Ltd. (72) Inventor Masao Hatanaka 3-14 Wakamiyacho, Izumisano-shi, Osaka

Claims (3)

[Claims] 1. A biodegradable resin composition comprising at least one biodegradable resin and cotton waste. 2. The biodegradable resin composition according to claim 1, wherein the cotton waste is cotton waste and / or thread waste. 3. A biodegradable resin molded product comprising the biodegradable resin composition according to claim 1.