Composite polymer materials and process for producing the same
A polymeric composite material includes a biodegradable polymeric material that can be biologically decomposed in soil. More specifically, it includes bacterial cellulose including ribbon-shaped micro-fibrils that could be biologically decomposed by microbes in addition to the biodegradable polymeric material and shows improved physical properties including tensile strength. Such a polymeric composite material could be prepared by a method including measures of inducing specified microbes cultured in a liquid culture medium to make bacterial cellulose, collecting and drying the generated bacterial cellulose into a powdery condition and mixing the powdery bacterial cellulose plus a biodegradable polymeric material to produce a composite material.
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1. Field of the Invention
This invention relates to a polymeric composite material containing a biodegradable polymeric substance to make it biodegradable in soil and also to a way of producing this type of composite material. More importantly, it relates to acomposite substance of bacterial cellulose and a biodegradable polymeric substance and in addition to a way of manufacturing this type of composite material.
2. Description of the Prior Art
Conventionally, synthetic resin is widely used as substance for fabricating containers for containing various items and cabinets for home audio and video devices as well as other electronic devices.
When disposing used containers and digital devices that are made of synthetic resin as waste, they are mostly incinerated at high temperature in an incineration furnace. When incinerated, artificial resin decomposes to substances thatcontaminate air. Efforts have been made to reuse synthetic resin materials so as to bypass the issues that may arise if incinerating synthetic resin. However, the utilization of synthetic resin materials requires a large capital investment forbuilding gigantic incineration facilities and can be accompanied by the difficulty of recovering synthetic resin materials demonstrating desired properties.
Especially, tens of several percent of freshly produced synthetic resin materials are currently not reused and only disposed by means of incineration or from various other way of waste disposal. Synthetic resin materials that are disposed withoutbeing incinerated mostly remain in soil or in water to contaminate the environment.
Biodegradable polymeric materials that are decomposed to low molecular weight materials by microbes in soil or in water have been suggested as alternatives that can avoid incineration for waste disposal. Specifically, such materials areadvantageously used for containers, electronic devices and fishing lines.
Then, containers and electronics apparatus made from a biodegradable composite material can be buried for waste disposal in the ground because they are eventually decomposed. Therefore, they don’t have to be incinerated at high temperatures forwaste disposal.
A biodegradable polymeric substance is used by itself or with one or more than one inorganic substances added thereto to produce a composite substance. More specifically, a biodegradable polymeric material might be used by itself to produce containers andcabinets of electronic devices or could possibly be used with a single or more than one inorganic substances added thereto to produce a composite substance that shows enhanced physical properties and mechanical power for those products manufactured from it. When used independently, abiodegradable polymeric substance generally does not show satisfactory physical properties and hence its scope of application is limited. Thus, one or more than one inorganic compounds are generally added to a biodegradable polymeric material inorder to improve some of the physical properties of its products and enlarge the scope of application.
If one or more than one inorganic substances are added, a biodegradable polymeric material can induce the natural surroundings if buried in the ground because all or a few of the inorganic substances stay undecomposed in the ground.
Meanwhile, the cabinets of audio/video devices and other electronic apparatus are required to show excellent physical attributes including a solid tensile strength. Because of this, it’s normally highly tough to prepare cabinets of audio/videoapparatus and other electronic apparatus by using just a biodegradable polymeric substance. Thusa biodegradable polymeric substance is usually used with one or more than one inorganic substances added thereto to prepare cabinets of electronic apparatusthat show an improved degree of tensile strength.
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