TW202235516A - Polyolefin composition and polyolefin plastic - Google Patents

Abstract

A polyolefin composition and a polyolefin plastic are provided. The polyolefin composition includes 70 to 99 parts by weight of a polyolefin matrix and 0.5 to 10 parts by weight of calcined shell powder. Polyolefin matrix includes polypropylene and polyolefin elastomer. Polyolefin plastic is made by compounding the polyolefin composition.

Description

Polyolefin composition and polyolefin plastic

This disclosure relates to a polyolefin composition and polyolefin plastic, in particular to a polyolefin composition and polyolefin plastic with good antibacterial and anti-whitening properties.

In recent years, with the improvement of the properties of organic materials and the improvement of processing technology, plastic products made of polyolefin materials have been widely used in many fields. By adopting a variety of polyolefin materials and processing the injected polyolefin products, they can have different characteristics to meet the application requirements of different fields. Therefore, manufacturers intend to adjust the composition of polyolefin materials to further expand the applicability of polyolefin materials and meet the needs of more products.

The polyolefin composition has a wide range of applications and can meet the application requirements of different fields. For example, the polyolefin composition can be used in the manufacture of luggage, packaging, home appliances, hygiene materials and other fields. The above-mentioned polyolefin products may be rubbed by hard objects during use, resulting in internal stress concentration and whitening on the surface, which is called stress whitening. In addition, the above-mentioned polyolefin products are often in contact with the human body, and because they do not have antibacterial and antibacterial functions, they are prone to breed bacteria.

In view of this, there is an urgent need to develop new polyolefin compositions to overcome the above problems.

The disclosure provides a polyolefin composition. The polyolefin composition includes 70 to 99 parts by weight of polyolefin substrate and 0.5 to 10 parts by weight of calcined shell powder. Polyolefin substrates include polypropylene and polyolefin elastomers. Polyolefin composition has good antibacterial and anti-whitening properties.

In some embodiments, the polyolefin elastomer includes ethylene propylene copolymer rubber.

In some embodiments, based on 100 weight percent of the polyolefin substrate, the content of the polyolefin elastomer is 10 weight percent to 50 weight percent.

In some embodiments, the polyolefin composition further includes a modified polyolefin, the modified polyolefin has a main chain structure and a side chain modifying group, wherein the main chain structure is polymerized by reactants, and the reactants include propylene, Ethylene, butene, hexene, octene or combinations thereof, side chain modification groups include maleic anhydride groups, maleic acid groups, acrylic acid groups, methacrylic acid groups, methyl methacrylate group, ethyl acrylate group, or a combination thereof.

In some embodiments, the modified polyolefin comprises polypropylene grafted with maleic anhydride.

In some embodiments, the modified polyolefin ranges from 0.5 parts by weight to 20 parts by weight.

In some embodiments, the graft ratio of the side chain modifying groups is 0.1% to 10%.

In some embodiments, the polyolefin substrate further includes polyethylene, copolymers of propylene and ethylene, butene, hexene, octene, or combinations thereof, or combinations thereof.

In some embodiments, calcined shell powder includes calcined oyster shell powder, meretrix meretrix shell powder, clam shell powder, nine-hole shell powder, peacock clam shell powder, sail shell powder, abalone shell powder, oyster shell powder, Powdered oyster shells, powdered pearl shells, powdered butterfly shells, powdered scallop shells, or combinations thereof.

The present disclosure provides a polyolefin plastic, which is prepared by kneading the polyolefin composition described in any one of the above embodiments.

It is to be understood that both the foregoing general description and the following specific description are exemplary and explanatory only and are intended to provide further explanation of the disclosure as claimed.

The making and using of embodiments of the disclosure are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific contexts. The specific embodiments discussed are illustrative only and do not limit the scope of the disclosure.

Herein, a range indicated by "one value to another value" is a general representation which avoids enumerating all values in the range in the specification. Therefore, the description of a specific numerical range covers any numerical value in the numerical range and the smaller numerical range bounded by any numerical value in the numerical range, as if the arbitrary numerical value and the smaller numerical value are expressly written in the specification. same range.

As mentioned in the prior art, the polyolefin composition has the problems of surface whitening due to scratching and easy breeding of bacteria. As the public attaches great importance to product appearance, hygiene and health, how to overcome the above-mentioned technical problems and defects has become a key problem to be solved. In view of this, there is an urgent need to develop polyolefin compositions with good antibacterial and anti-whitening properties to improve the aforementioned problems and defects.

The disclosure provides a polyolefin composition. The polyolefin composition includes 70 to 99 parts by weight of polyolefin substrate and 0.5 to 10 parts by weight of calcined shell powder. Polyolefin substrates include polypropylene and polyolefin elastomers. Polyolefin composition has good antibacterial and anti-whitening properties.

In one embodiment, the polyolefin substrate is preferably 90 to 99 parts by weight. In some embodiments, based on 100 weight percent of the polyolefin substrate, the content of polypropylene is greater than or equal to 50 weight percent and less than 100 weight percent. Preferably, based on 100 weight percent of the polyolefin substrate, the content of polypropylene is greater than or equal to 50 weight percent and less than 90 weight percent. In some embodiments, based on 100 weight percent of the polyolefin substrate, the content of the polyolefin elastomer is 10 weight percent to 50 weight percent. Preferably, based on 100 weight percent of the polyolefin substrate, the content of the polyolefin elastomer is 10 weight percent to 25 weight percent.

In some embodiments, the polyolefin elastomer (POE) includes ethylene propylene copolymer rubber. The ethylene-propylene copolymer rubber includes ethylene-propylene rubber (ethylene propylene rubber; EPR), ethylene-propylene-diene rubber, ethylene-propylene-diene rubber (ethylene propylene diene-terpolymer; EPDM) or combinations thereof. But the present disclosure is not limited thereto, and other suitable ethylene propylene copolymer rubbers can also be used as the polyolefin elastomer of the present disclosure.

When the polyolefin composition contains polyolefin elastomer, when mixing polypropylene, polyolefin elastomer and calcined shell powder, since the polyolefin elastomer limits the crystal ball size of polypropylene during mixing, it can be The crystalline spherulites of the polyolefin substrate are refined, thereby improving the anti-whitening property of the polyolefin composition of the present disclosure.

The polyolefin substrate may further comprise a polyolefin other than polypropylene. In detail, in some embodiments, the polyolefin substrate further includes polyethylene, a copolymer of propylene and ethylene, butene, hexene, octene or a combination thereof, or a combination thereof. For example, preferably, the polyolefin substrate further includes a copolymer of propylene and ethylene. In some embodiments, the polyolefin substrate further includes a copolymer formed by reacting propylene with a mixture of ethylene, butene, hexene, octene or a combination thereof. In this embodiment, based on 100% by weight of the mixture, propylene The content of butene can be 20% by weight to 100% by weight, the content of ethylene can be 0% by weight to 20% by weight, the content of butene can be 0% by weight to 20% by weight, and the content of hexene can be 0% by weight to 20% by weight. % by weight, the content of octene can be 0% by weight to 20% by weight. In some embodiments, the polyolefin substrate further includes polyethylene, and based on 100 weight percent of the polyolefin substrate, the polyethylene content is 20 weight percent to 50 weight percent.

When the polyolefin substrate includes a copolymer formed of propylene and other olefinic compounds, the copolymerized segment formed by other olefinic compounds can be interspersed in the propylene polymerized segment, so that the formed polyolefin crystal The ball is smaller. When polyolefin is rubbed by hard objects, the stress tends to concentrate on the crystal ball interface, resulting in the difference in refractive index and whitening phenomenon. For this reason, the copolymer formed by adding other alkenyl compounds has better anti-whitening properties due to its smaller crystal spheres, so these copolymerized segments help to improve the anti-whitening properties of antibacterial and anti-whitening polyolefin compositions. When the polyolefin base material includes polyethylene, when mixing the polyolefin composition, because polyethylene limits the crystal spherulite size of polypropylene during mixing, it can refine the crystal spherulites of the polyolefin base material, thereby improving Anti-blushing properties of polyolefin compositions of the present disclosure.

In some embodiments, calcined shell powder includes calcined oyster shell powder, meretrix meretrix shell powder, clam shell powder, nine-hole shell powder, peacock clam shell powder, sail shell powder, abalone shell powder, oyster shell powder, Powdered oyster shells, powdered pearl shells, powdered butterfly shells, powdered scallop shells, or combinations thereof. For example, the calcining temperature is 900°C to 1200°C. Shell powder can be made from ordinary discarded natural shellfish shells through cleaning, crushing, calcining, grinding and other methods. Shell powder contains calcium oxide, which acts as an antibacterial material. Calcium oxide and air moisture create an alkaline environment, which has an antibacterial effect. The shell powder of this disclosure is not limited to the above materials. According to the above description, when the calcined shell powder includes calcium oxide, the antibacterial properties of the antibacterial and anti-whitening polyolefin composition of this disclosure can be effectively improved. According to the present disclosure, waste shells can be used to produce calcined shell powder, which is not only environmentally friendly, but also greatly increases the value of recycling and reuse of waste shells.

In some embodiments, calcined shell powder is produced by the following steps. (a) performing a pretreatment step on shellfish shells to obtain shellfish shell pellets. (b) performing an alkali coating step on shellfish shell particles. (c) performing a calcining step on the alkali-coated particles to obtain calcined particles. (d) A grinding step is performed on the calcined particles to obtain calcined shell powder. In some embodiments, the pretreatment steps include but are not limited to, for example, removing residual meat and impurities in shellfish shells, performing surface cleaning and coarse crushing steps, so as to obtain shellfish shell particles. In some embodiments, the alkali coating step is to coat the shellfish shell particles with a calcium salt slurry comprising at least 2.5 wt.% calcium salt for 2 hours to 4 hours, and the shellfish shell particles and the calcium salt slurry The weight-to-volume ratio (g/mL) of the feedstock is 0.1-1. In some embodiments, the calcium salt is calcium hydroxide. In some embodiments, the calcining step is performed at a temperature of 900°C to 1200°C. In some embodiments, the calcination time is from 3 hours to 6 hours. In some embodiments, the shellfish shell is derived from a monovalve shell and/or a bivalve shell.

In some embodiments, the calcined shell powder produced by the above steps has a core-shell structure, the core layer of the core-shell structure is micron-sized calcium oxide particles, and the shell layer of the core-shell structure is nanometer to submicron Calcium oxide particles, the average particle size of micron-sized calcium oxide particles is 7 μm to 500 μm, and the average particle size of nanometer-to-submicron-sized calcium oxide particles is not greater than 200 nm. In some embodiments, the calcined shell meal has a whiteness of at least 60. The whiteness is, for example, 60 to 88. In some embodiments, the calcined shell meal has a zinc content of less than 1.67 ppm, a manganese content of less than 40 ppm, and an iron content of less than 350 ppm. In some embodiments, the shell layer of the core-shell structure is a discontinuous layer or a continuous layer. In some embodiments, the nanoscale to submicron calcium oxide particles have an average particle diameter of 60 nm to 150 nm. In some embodiments, the calcined shell meal has a specific surface area of at least 8000 cm ² /g.

The polyolefin composition of the present disclosure can be prepared into polyolefin plastic through kneading. Since the calcined shell powder containing calcium oxide is dispersed in the polyolefin substrate, a heterogeneous nucleation phenomenon occurs, resulting in an increase in the crystallization rate of the polyolefin substrate, and the crystal spherulites of the polyolefin substrate can be refined and crystallized. The boundaries between the balls tend to be blurred, and have a synergistic effect with the anti-whitening properties of polyolefin elastomers, copolymers of propylene and other olefinic compounds, and polyethylene, so that the anti-whitening properties of the polyolefin compositions of this disclosure can be improved. nature.

In the polyolefin composition of the present disclosure, based on 100 parts by weight of the polyolefin composition, when the content of calcined shell powder is less than 0.5 parts by weight, too little calcined shell powder cannot meet the antibacterial requirements, and It is difficult to effectively improve the antibacterial properties of polyolefin compositions. When the content of shell powder is greater than 10 parts by weight, although the antibacterial properties of the polyolefin substrate can be effectively improved, too much calcined shell powder tends to agglomerate during the mixing process and cannot be uniformly dispersed in the polyolefin substrate , thereby reducing the mechanical properties of the polyolefin composition. In some embodiments, the calcined shell powder is preferably 1 to 6 parts by weight.

In some embodiments, the polyolefin composition further includes a modified polyolefin, the modified polyolefin has a main chain structure and a side chain modifying group, wherein the main chain structure is polymerized by reactants, and the reactants include propylene, Ethylene, butene, hexene, octene or combinations thereof, side chain modification groups include maleic anhydride groups, maleic acid groups, acrylic acid groups, methacrylic acid groups, methyl methacrylate group, ethyl acrylate group, or a combination thereof. The present disclosure is not limited thereto, and other suitable alkenes can also be used as reactants of the present disclosure. In some embodiments, the content of the modified polyolefin is 0.5 parts by weight to 20 parts by weight. In some embodiments, the content of the modified polyolefin is preferably 1 to 6 parts by weight.

Since the modified polyolefin can be mixed evenly with the polyolefin, and the side chain modifying group can attract the surface groups of the calcined shell powder, which helps to disperse the shell powder more evenly on the polyolefin substrate In order to improve the antibacterial and anti-whitening properties of the polyolefin composition. In some embodiments, the modified polyolefin comprises polypropylene grafted maleic anhydride (PP-g-MA). The polypropylene with maleic anhydride side chain modifying groups can bond the shell powder through the maleic anhydride group, and use the polypropylene segment to attract the polyolefin substrate, so that the shell powder can be further dispersed in polyolefin substrates. The polypropylene grafted with maleic anhydride groups can form a modified layer and cover the surface of the shell powder, so it can improve the dispersion of the shell powder on the polyolefin substrate.

In some embodiments, the graft ratio of the side chain modifying groups is 0.1% to 10%. When the grafting rate of the side chain modifying group is within the aforementioned range, an appropriate amount of the side chain modifying group can more effectively disperse the shell powder in the polyolefin substrate, and an appropriate amount of the side chain modifying The group can simultaneously take into account the anti-whitening properties and antibacterial properties of the obtained polyolefin composition.

In some embodiments, based on 100 parts by weight of the polyolefin composition, the content of the modified polyolefin is 0.5 to 20 parts by weight, and preferably 1 to 6 parts by weight. If the usage amount of the modified polyolefin is less than 0.5 parts by weight, the above-mentioned modified polyolefin has no obvious dispersing effect on the shell powder, and cannot effectively improve the antibacterial and anti-whitening effects of the polyolefin composition. If the content of the modified polyolefin is greater than 20 parts by weight, too much modified polyolefin will reduce the mechanical properties of the obtained polyolefin composition.

The present disclosure provides a polyolefin plastic, which is prepared by kneading the polyolefin composition described in any one of the above embodiments. In detail, polyolefin plastic particles with antibacterial and anti-whitening properties can be produced by uniformly mixing the raw materials of polyolefin composition by high temperature and applied shear force, extruding and cooling. For example, the temperature of mixing is 180°C to 250°C.

The following examples are used to illustrate the application of this disclosure, but they are not intended to limit this disclosure. Anyone skilled in this art can make various changes and modifications without departing from the spirit and scope of this disclosure.

Experimental example 1: Preparation of antibacterial and anti-whitening polyolefin composition, evaluation of anti-whitening and antibacterial evaluation

The polyolefin substrate of the polyolefin composition in Example 1 includes 55% by weight of polypropylene, 25% by weight of polyethylene, and 20% by weight of ethylene propylene copolymer rubber. Next, the antibacterial, anti-whitening polyolefin composition of embodiment 1 comprises 99 parts by weight of the aforementioned polyolefin base material, 1 part by weight of oyster shell powder and 0 parts by weight of polypropylene grafted maleic anhydride (PP-g-MA ). The antibacterial and anti-whitening polyolefin composition of Example 1 can be obtained by mixing the above materials.

The antibacterial and anti-whitening polyolefin compositions of Examples 2 to 14 and Comparative Examples 1 to 3 use the same process steps as the preparation method of the antibacterial and anti-whitening polyolefin compositions of Example 1. The difference In embodiment 2 to embodiment 14 and comparative example 1 to comparative example 3 change antibacterial, the composition of the polyolefin substrate in the anti-whitening polyolefin composition and its usage amount and change the oyster shell powder and The amount of polypropylene grafted maleic anhydride.

The evaluation results of the formulations, anti-whitening properties and antibacterial properties of the above-mentioned Examples 1 to 14 and Comparative Examples 1 to 3 are shown in Table 1, Table 2, Table 3 and Table 4 respectively, and will not be repeated here. . The manner in which the anti-whitening properties and antibacterial properties were tested will be described later. Table I Comparative example 1 Comparative example 2 Comparative example 3 Polyolefin substrate (wt%) Polypropylene 100 55 85 polyethylene 0 25 0 Ethylene Propylene Copolymer Rubber 0 20 15 Antibacterial, anti-whitening polyolefin composition (parts by weight) Polyolefin substrate 100 100 100 oyster shell powder 0 0 0 Polypropylene grafted maleic anhydride 0 0 0 Anti-whitening Test piece L value 24.3 45.6 43.6 Impact whitening ΔL N/A 17 8.3 Anti-fold white ΔL 9.4 2.0 11.5 Antibacterial Antibacterial rate (%) 0 0 0 Table II Example 1 Example 2 Example 3 Example 4 Polyolefin substrate (wt%) Polypropylene 55 55 55 55 polyethylene 25 25 25 25 Ethylene Propylene Copolymer Rubber 20 20 20 20 Antibacterial, anti-whitening polyolefin composition (parts by weight) Polyolefin substrate 99 98 96.5 95 oyster shell powder 1 2 3.5 5 Polypropylene grafted maleic anhydride 0 0 0 0 Anti-whitening Test piece L value 48.2 56.7 67.4 71 Impact whitening ΔL 16.2 13.3 7.8 4.7 Anti-fold white ΔL N/A 1.9 1.4 1 Antibacterial Antibacterial rate (%) 52.5 74.5 89 99.9 Table three Example 5 Example 6 Example 7 Example 8 Polyolefin substrate (wt%) Polypropylene 55 55 55 55 polyethylene 25 25 25 25 Ethylene Propylene Copolymer Rubber 20 20 20 20 Antibacterial, anti-whitening polyolefin composition (parts by weight) Polyolefin substrate 97 96 94.5 93 oyster shell powder 1 2 3.5 5 Polypropylene grafted maleic anhydride 2 2 2 2 Anti-whitening Test piece L value 50.4 59.8 69.3 74.2 Impact whitening ΔL 11.4 6.9 3.5 1.6 Anti-fold white ΔL 0.3 0.4 0.5 0.2 Antibacterial Antibacterial rate (%) 56.3 78.9 99 99.9 Table four Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 Polyolefin substrate (wt%) Polypropylene 85 85 85 85 85 85 polyethylene 0 0 0 0 0 0 Ethylene Propylene Copolymer Rubber 15 15 15 15 15 15 Antibacterial, anti-whitening polyolefin composition (parts by weight) Polyolefin substrate 99 95 97 96 94.5 93 oyster shell powder 1 5 1 2 3.5 5 Polypropylene grafted maleic anhydride 0 0 2 2 2 2 Anti-whitening Test piece L value 51.3 70.9 54.7 63.5 68.3 71.4 Impact whitening ΔL 3.9 3.4 3.8 2.6 2.5 3 Anti-fold white ΔL 8.8 3.6 8.6 6 4.9 3.2 Antibacterial Antibacterial rate (%) 68 99.9 74 89 99 99.9

The evaluation method of the L value of the test piece is as follows: the antibacterial and anti-whitening polyolefin compositions of Examples 1 to 14 and Comparative Example 1 and Comparative Example 3 are passed through an injection machine (manufacturing company is FCS Precision Industry Co., Ltd., Model HT100) made a test piece with a length of 120mm, a width of 70mm, and a thickness of 2mm, and analyzed the brightness of the test piece with a colorimeter (manufactured by NIPPON DENSHOKU, model SA2000), which refers to the L value.

The evaluation method of anti-whitening property distinguishes two kinds of anti-impact whitening and anti-folding whitening. The evaluation method of anti-impact whitening is as follows: 2Kg weight is used to freely lower the test piece from a height of 500mm to impact a 2mm test piece, and the difference in L value before and after (ΔL) is obtained, which is the anti-impact whitening. good. The whitening evaluation method is as follows: bend the test piece, and obtain the difference in L value (ΔL) before and after, which is the whitening. Therefore, if the whitening ΔL is small, it means that the impact whitening is good.

The evaluation method of antibacterial properties is as follows: The evaluation method of the antibacterial properties of the antibacterial and anti-whitening polyolefin compositions of Examples 1 to 14 and Comparative Examples 1 to 3 is as follows: the length 120 mm and the width 70 mm are obtained by the aforementioned injection mechanism. 1. A test piece with a thickness of 2 mm was cleaned with 75% alcohol according to the CNS 15823 method, and 0.4 mL of bacterial solution was inoculated into the test piece, then covered with a film and cultured in a petri dish for 24 hours. After the culture was completed, the test piece was rinsed with 10 mL of culture solution, and finally the difference in the number of colonies in the culture solution of the control group and the antibacterial test piece was compared.

According to Examples 1 to 14 contained in Table 2 to Table 4 and Comparative Example 1 and Comparative Example 3 contained in Table 1, it can be seen that when the polyolefin substrate contains a second polyolefin ( Ethylene propylene copolymer rubber) and/or the third polyolefin (polyethylene), the prepared antibacterial, anti-whitening polyolefin composition has better anti-whitening properties. Among them, when the polyolefin substrate of the antibacterial and anti-whitening polyolefin composition includes ethylene-propylene copolymer rubber or ethylene-propylene copolymer rubber and polyethylene, and includes oyster shell powder, it has better anti-whitening properties. Furthermore, when the polyolefin substrate of the antibacterial and anti-whitening polyolefin composition includes polyethylene, ethylene-propylene copolymer rubber, oyster shell powder and polypropylene grafted maleic anhydride, it has the best anti-whitening properties.

According to Example 1 to Example 14 contained in the aforementioned Table 2 to Table 4 and Comparative Example 1 and Comparative Example 3 contained in Table 1, it can be known that when the antibacterial and anti-whitening polyolefin composition includes oyster shell powder, the obtained The antibacterial, anti-whitening polyolefin composition has high antibacterial properties. Further, when the antibacterial and anti-whitening polyolefin composition contains oyster shell powder and polypropylene grafted maleic anhydride, the antibacterial property can be further improved.

Experimental example 2: Evaluation of crystal ball size of antibacterial and anti-whitening polyolefin composition

The evaluation method of the crystal ball size of the antibacterial and anti-whitening polyolefin compositions of Example 1 and Comparative Example 2 is to analyze the crystal ball size of the composition by a polarizing microscope (manufactured by NIKON, model LV100POL). Comparative example 2 does not contain oyster shell powder, and embodiment 1 contains oyster shell powder.

Please refer to Figure 1 and Figure 2. Figure 1 is an experimental picture taken with a polarizing microscope of Comparative Example 2 according to the present disclosure. Figure 2 is an experimental picture taken with a polarizing microscope according to Example 1 of the present disclosure. It can be seen from Figure 1 and Figure 2 that when the antibacterial and anti-whitening polyolefin composition contains oyster shell powder, due to the heterogeneous nucleation phenomenon, the crystal spherulites of the polyolefin substrate can be refined and the boundaries of the crystal spherulites tend to be closer to each other. blurry. It can be known that the oyster shell powder can improve the anti-whitening property of the polyolefin composition disclosed in the present disclosure.

According to the above description, it can be known that the polyolefin composition disclosed in this disclosure includes polypropylene, polyolefin elastomer and calcined shell powder, has good anti-whitening property and antibacterial property at the same time, has wide applicability, and can meet various requirements. demand for products. Moreover, the whitening resistance of the polyolefin composition can be further improved by adding a polyolefin other than polypropylene and/or a modified polyolefin.

Although the disclosure has been described in some detail with reference to certain implementations, other implementations are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and changes can be made in the structure of this disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure which come within the scope of the appended claims.

none

The above and other aspects, features and other advantages of the present disclosure can be understood more clearly with reference to the contents of the specification and attached drawings, wherein: Figure 1 is an experimental picture taken with a polarizing microscope of Comparative Example 2 according to the present disclosure. Figure 2 is an experimental picture taken with a polarizing microscope according to Example 1 of the present disclosure.

Claims (10)

A polyolefin composition comprising: 70 to 99 parts by weight polyolefin substrates, including polypropylene and polyolefin elastomers; and 0.5 to 10 parts by weight of calcined shell powder. The polyolefin composition according to claim 1, wherein the polyolefin elastomer comprises ethylene propylene copolymer rubber. The polyolefin composition according to claim 1, wherein based on 100 weight percent of the polyolefin substrate, the content of the polyolefin elastomer is 10 weight percent to 50 weight percent. The polyolefin composition as described in claim 1 further includes modified polyolefin, which has a main chain structure and side chain modifying groups, wherein the main chain structure is polymerized by a reactant into, the reactant includes propylene, ethylene, butene, hexene, octene or a combination thereof, and the side chain modifying group includes maleic anhydride group, maleic acid group, acrylic acid group, methyl Acrylic groups, methyl methacrylate groups, ethyl acrylate groups, or combinations thereof. The polyolefin composition as claimed in item 4, wherein the modified polyolefin comprises polypropylene grafted maleic anhydride. The polyolefin composition according to claim 4, wherein the modified polyolefin is 0.5 to 20 parts by weight. The polyolefin composition as described in claim 4, wherein the graft ratio of the side chain modifying groups is 0.1% to 10%. The polyolefin composition according to claim 1, wherein the polyolefin substrate further comprises polyethylene, a copolymer of propylene and ethylene, butene, hexene, octene or a combination thereof, or a combination thereof. The polyolefin composition as described in claim 1, wherein the calcined shell powder includes calcined oyster shell powder, meretrix meretrix shell powder, clam shell powder, nine-hole shell powder, peacock clam shell powder, sail shell powder, Abalone shell powder, oyster shell powder, oyster shell powder, pearl shell powder, butterfly shell powder, scallop shell powder or combinations thereof. A polyolefin plastic is prepared by kneading the polyolefin composition described in any one of claims 1 to 9.

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