TW202248327A - A film containing shell powder and application thereof - Google Patents

Abstract

A film containing shell powder and application thereof comprises a shell powder with average particle size at a range of 0.1[mu]m~300[mu]m and a biodegradable plastic. The shell powder is dispersed in the biodegradable plastic at a range below 20 wt%. The present invention recycles and re-uses the waste oyster shells and introduces them into plastic for making packaging material. This could create a secondary economic and commercial value for the waste oyster shells and also solve the environmental problem for such waste disposable by the farmers.

Description

A kind of plastic diaphragm containing shell powder and its application

The invention relates to the field of membranes mixed with organic powders and plastics, in particular a membrane material with excellent antibacterial properties, degradability and special mechanical properties after mixing shell organic powders with plastics and related application products.

The shell powder plastics of the present invention are first aimed at flat film sheets, and are applied to food packaging materials that require specific usage methods, but the shell powder plastic film sheets provided by the present invention are not limited to these In terms of application, other identical or similar technical means and application scopes are covered within the declared scope of the present invention.

Oyster is a kind of fish with rich nutrition. It enjoys the reputation of "Ocean Milk" and "Ocean Super Rice". It is a noble but inexpensive food on the table. And rich in high economic value products.

The western coastal area of Taiwan is a vast sea. On the beach at the junction of the sea and the land, there are often piles of gray-white hills, which are the proof of the fruitful results of Taiwan's oyster (or oyster) farming industry. The developed oyster farming The fishery has made Taiwan a well-known oyster breeding country in Asia. These white hills are oyster shells left by oyster farmers after collecting oyster meat. Since oyster shells are natural products, not artificial products such as plastic, most oyster farmers will push these oyster shells on the beach to let them It decomposes naturally, but the process of decomposition will cause foul smell, flying insects flying all over the sky, and occupy a large beach area, which is an invisible environmental killer.

For this, there is currently a mechanism that can recycle and reuse the discarded oyster shells to improve the environmental problems caused by the discarded oyster shells disclosed above.

In order to improve the environmental problems caused by discarded oyster shells, the present invention aims to provide a shell powder plastic film material and its application, which can turn discarded oyster shells into effective resources, and even successfully introduce commercial products with economic value, and oyster shells The antibacterial power it has can not only increase the added value of the product, but also solve the problem of undisposed disposal of discarded oyster shells, and return a better environment and beautiful scenery to coastal beaches.

The main technical concept of the present invention is a plastic film containing shell powder, which includes: a shell powder, the average particle size of which is between 0.1 μm and 300 μm; a biodegradable plastic; and the shell powder with a concentration of less than 20 wt%. Mixed in this biodegradable plastic.

Wherein, the shell powder is oyster shell powder, more preferably pulverized and calcined oyster shell powder, and the calcining is carried out at a temperature and time range of 600-1300° C. for 45 minutes to 12 hours. .

Wherein, the biodegradable plastic comprises polylactic acid (PLA), poly 3-hydroxyalkanoate (PHA), polyε-caprolactone (PCL), polybutylene succinate (PBS) or polyethylene Alcohol (PVA).

Wherein, the average particle size of the shell powder also includes 0.3 μm to 280 μm.

Wherein, the average particle size of the shell powder also includes 0.33 μm to 270 μm.

Wherein, the mechanical strength of the plastic film containing shell powder in the direction perpendicular to the mechanical traction is stronger than that in the direction parallel to the mechanical traction.

Another technical concept of the present invention is a packaging material, which comprises the aforementioned plastic film containing shell powder.

As can be seen from the above description, the present invention has the following excellent effects and favorable characteristics:

1. The present invention recycles and reuses discarded oyster shells, and imports them into related packaging materials with economic and commercial value, which not only solves the environmental problems caused by current oyster shells discarded by oyster farmers, but also provides such marine wastes that can generate additional way out of economic value.

2. Through experimental tests, shell powder can produce special mechanical properties in a specific particle size and concentration range. Based on this, the present invention uses this discovery to introduce shell powder into biodegradable plastics and make it mechanically compatible with specific directions. In the application of related products with property requirements, in addition to solving the problem of marine debris mentioned above, it also improves the shortcomings of existing packaging materials that are not degradable or not suitable for the mechanical pulling force of the packaging process in a specific direction.

In order to understand the technical features and practical functions of the present invention in detail, and to implement them according to the contents of the description, a preferred embodiment as shown in the drawings is further described in detail as follows.

"Preferable embodiment of the plastic membrane containing shell powder of the present invention"

The shell powder used in the present invention is mainly from discarded shells. For example, the oyster shell powder with antibacterial properties obtained after crushing and calcining oyster shells has an average particle size of 0.1 μm to 300 μm, preferably 0.3 μm to 280 μm , more preferably between 0.33 μm and 270 μm. The so-called average particle size in the present invention means that in each batch of crushed and calcined oyster shell powder, all powder particles have a particle size range of 0.067 μm-152.453 μm, and the average value can be 0.33964 μm, or about 0.33 μm, and the above average particle size range is the average particle size range obtained from the oyster shell powder obtained after repeated crushing and calcining. Wherein, the calcination temperature and time range adopted in the calcination step are calcination at 600~1300°C for 45 minutes to 12 hours, and the preferred range is calcination at 700~1200°C for 1 to 3 hours, the best range Then it is calcined at 850~1000°C for 60 to 120 minutes. After calcination, the remaining powder components are analyzed and mainly contain calcium oxide (CaO), magnesium chloride, potassium, sulfur, phosphorus, zinc and other substances.

The film sheet provided by the present invention is obtained by mixing the above-mentioned shell powder with a biodegradable plastic (Biodegradable Plastic), and then using a general film-making process. Among them, the biodegradable plastics include but not limited to polylactic acid (PLA), poly 3-hydroxyalkanoate (PHA), polyε-caprolactone (PCL), polybutylene succinate (PBS) Or polyvinyl alcohol (PVA), etc., and the concentration of the shell powder mixed in the biodegradable plastic is less than 20 wt%.

"A preferred embodiment of the application of the film sheet containing shell powder of the present invention"

In the present invention, the crushed and calcined oyster shell powder is introduced into the biodegradable plastic and made into a film sheet. The following is the relevant mechanical property test data. The examples in the following tables are made of plastic films with concentrations of 0%, 1%, 5%, 10% and 20%, respectively, using polylactic acid as the biodegradable plastic.

Table 1. (MD: parallel to the direction of mechanical traction; TD: vertical to the direction of mechanical traction) mechanical properties Tensile strength (kgf/cm ² ) Force direction MD TD Concentration/Particle Size 270μm 0.33μm 270μm 0.33μm 0 wt% (comparative example) 140.9±11.9 104.2±9.9 1wt% - 107.9±13.4 - 67.6±7.8 5wt% 68.8±5.7 85.6±16.9 10.1±3.5 51.1±8.1 10wt% 74.2±11.5 97.5±6.8 14.5±4.0 47.8±5.5 20wt% 44.1±3.9 70.1±13 11.4±2.2 38.2±7.9

Table 2. (MD: parallel to the direction of mechanical traction; TD: vertical to the direction of mechanical traction) mechanical properties Elongation (%) Force direction MD TD Concentration/Particle Size 270μm 0.33μm 270μm 0.33μm 0 wt% (comparative example) 215.2±23.1 51.2±23.9 1wt% - 365.6±58.9 - 112.3±55.4 5wt% 460.9±24.1 500±65.4 0.8±0.2 432.0±83.4 10wt% 537.6±25.6 520±16.6 1.0±0.2 581.3±73.4 20wt% 552.2±21.2 474.1±17.6 2.2±0.4 498.2±116.4

table 3. (MD: parallel to the direction of mechanical traction; TD: vertical to the direction of mechanical traction) mechanical properties Tear strength (gf) Force direction MD TD Concentration/Particle Size 270μm 0.33μm 270μm 0.33μm 0 wt% (comparative example) 110.6±18.2 264.0±17.5 1wt% - 37.0±2.8 - 278.8±10.7 5wt% 5.0±1.3 148.6±11.3 1.2±0.3 275.4±14.1 10wt% 6.4±1.0 166.8±18.0 1.9±0.4 295.4±55.1 20wt% 5.4±1.2 160.4±12.1 1.9±0.4 202.0±11.4

From the test data of the membrane sheet of the present invention in Tables 1 to 3 above, it can be seen that the membrane sheet with a specific particle size and concentration can have excellent mechanical performance in the vertical mechanical traction direction (TD). Therefore, the present invention can be applied to related packaging materials that require better expansion in a specific direction. At present, food packaging materials, especially the sub-packaging of meat and fishery products, the film sheet used in it needs to have good extension force in a specific direction under the drag of the packaging machinery, otherwise it is easy to be damaged during the mechanical pulling process. Middle breaks produce cracked products.

Please refer to Fig. 1, the film sheet material containing shell powder provided by the present invention can form a packaging roll material 10 and be applied to pack a boxed meat product 20, and this packaging roll material 10 has excellent elongation characteristic in the length direction, and The mechanical properties in the transverse direction are weak. In this case, when the packaging machine drags the present invention and wraps the boxed meat 20 (for example, in the direction of the arrow in FIG. 1 ), it can moderately apply a pulling force in the longitudinal direction, so that The packaging coil 10 can be well pasted and packaged on the boxed meat 20. When the packaging coil 10 needs to be cut off, it can be easily torn and automatically The packaging roll 10 is removed.

Please refer to Fig. 2～Fig. 6, the present invention utilizes the film sheet material that contains shell powder to carry out antibacterial test, the result shows, when shell powder is concentration 0.2%, Escherichia coli (Escherichia coli, BCRC11634, Staphylococcus aureus ( Staphylococcus aureus, BCRC10451), Vibrio parahaemolytieus, BCRC12863 and other bacteria have partial antibacterial effect, and Aeromonas hydrophila (BCRC13881) has complete antibacterial effect; the concentration reaches 0.3% Escherichia coli (BCRC11634), Staphylococcus aureus (BCRC10451), Vibrio parahaemolytieus (BCRC12863) and Pseudomonas aeruginosa (BCRC10944) achieved complete antibacterial effect

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of rights claimed by the present invention. All other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in the present invention. within the scope of the patent application.

10: Packaging coil 20: Boxed Meat

Fig. 1 is a schematic diagram of a preferred embodiment of the present invention applied to packaging materials. Fig. 2 is the antibacterial test result of Escherichia coli on the film sheet containing shell powder of the present invention. Fig. 3 is the antibacterial test result of Staphylococcus aureus on the film sheet containing shell powder of the present invention. Fig. 4 is the result of the antibacterial test of Pseudomonas aeruginosa on the film sheet containing shell powder of the present invention. Fig. 5 is the antibacterial test result of Parahaemolyticus parahaemolyticus on the film sheet containing shell powder of the present invention. Fig. 6 is the test result of the antibacterial activity of Aeromonas hydrophila on the film sheet containing shell powder of the present invention.

10: Packaging coil

20: Boxed Meat

Claims (8)

A plastic membrane containing shell powder, which comprises: 1. Shell powder, the average particle size of which is between 0.1 μm and 300 μm; - biodegradable plastic; and The shell powder is mixed in the biodegradable plastic at a concentration of less than 20 wt%. Such as the plastic film containing shell powder of item 1 of the scope of the patent application, wherein: the shell powder is oyster shell powder. Such as the plastic film containing shell powder in the second item of patent application, wherein: the oyster shell powder is pulverized and calcined oyster shell powder, and the calcining is carried out at a temperature and time range of 600~1300°C for 45 minutes. to 12 hours. Such as the plastic film containing shell powder in the first item of the patent scope of the application, wherein: the biodegradable plastic includes polylactic acid (PLA), poly 3-hydroxyalkanoate (PHA), polyε-caprolactone (PCL ), polybutylene succinate (PBS) or polyvinyl alcohol (PVA). Such as the plastic film containing shell powder as claimed in item 1, 2, 3 or 4 of the scope of patent application, wherein: the average particle size of the shell powder is 0.3 μm to 280 μm. Such as the plastic film containing shell powder as claimed in item 1, 2, 3 or 4 of the patent scope, wherein: the average particle size of the shell powder is 0.33 μm to 270 μm. The shell powder-containing plastic membrane according to any one of the aforementioned patent scopes 1 to 6, wherein: the mechanical strength of the shell powder-containing plastic membrane is stronger in the direction perpendicular to the mechanical traction than in the parallel mechanical traction direction. A packaging material, which includes: the plastic film containing shell powder according to any one of the aforementioned patent scopes 1 to 7.

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