A polyolefin composition and its preparation method and application

Abstract

The present invention discloses a polyolefin composition, its preparation method, and its application, belonging to the field of polymer materials technology. The polyolefin composition comprises the following components, by weight: 20-98 parts of a polyolefin resin; 8-50 parts of a modified natural fiber; 0.5-20 parts of a compatibilizer; 1-10 parts of a flame retardant; and 0.1-2 parts of a processing aid. The modified natural fiber is steam-exploded natural fiber, having an average diameter of no more than 100 μm and an average length of no less than 1 mm. The polyolefin composition of the present invention, through the synergistic effect of the modified natural fiber and the flame retardant, improves the rigidity and surface hardness of the polyolefin composition, imparts a prickly feeling to the surface of the polyolefin composition when bitten by animals, and enhances the antibacterial properties of the polyolefin composition, resulting in excellent animal resistance, flame retardancy, and antibacterial properties.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and more particularly to a polyolefin composition, a preparation method thereof, and an application thereof. Background Art

[0002] As the livestock industry strives for factory-based and intensive development, large-scale farming is rapidly increasing, with farms for livestock such as pigs and bamboo rats becoming increasingly common. Consequently, piggeries and other structures require a wide range of polymer plastic materials. Among these materials, the polyolefin mats used in piggery flooring systems are particularly susceptible to damage, necessitating an extended lifespan.

[0003] Polyolefin mats used on pig farm flooring systems are easily bitten or pushed by pigs, significantly reducing their service life and increasing their operating costs. Large-scale, intensive farming models require a strong focus on biosafety, and fire-resistant piggery construction is crucial to avoid significant losses from fires. Furthermore, pig farms are susceptible to various viruses and bacteria, necessitating the prevention of livestock diseases.

[0004] To prevent animal bites, components such as capsaicin and bittering agents can be added to polyolefin mats. However, these ingredients have a strong bitter and spicy odor, are difficult to produce and process, have a significant negative impact on the farming environment, and cannot be used normally. To improve the antibacterial properties of the material, antimicrobial agents such as silver ion antimicrobial agents and chitosan antimicrobial agents are usually added to polyolefin materials. However, generally, a large amount of antimicrobial agents is required to significantly improve the antimicrobial properties of polyolefin materials, and adding large amounts of antimicrobial agents will significantly increase the cost of polyolefin materials. Ordinary polyolefin materials are extremely flammable, and fires can cause huge losses to the livestock farming industry. Therefore, considering the characteristics of polyolefin materials and the high-molecular functional plastic materials used in pig farm construction, the development of polyolefin composite materials that are anti-pig bite, flame retardant, and fireproof has important technical value and market potential. They can achieve multifunctionality and a long service life, and are used in polyolefin mats and other components for floor systems in the farming industry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects and shortcomings of existing polyolefin compositions, such as being not resistant to animal bites, being flammable and having poor antibacterial properties, and to provide a polyolefin composition that achieves animal-resistant, flame-retardant, fire-resistant and antibacterial functions.

[0006] Another object of the present invention is to provide a method for preparing the polyolefin composition.

[0007] Another object of the present invention is to provide a use of the polyolefin composition in preparing animal farm facilities.

[0008] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0009] A polyolefin composition comprising the following components in parts by weight:

[0010]

[0011] The modified natural fiber is a natural fiber obtained by steam explosion treatment, and the average diameter of the modified natural fiber is not greater than 100 μm and the average length is not less than 1 mm;

[0012] The natural fiber is one or more of ramie fiber, jute fiber and bamboo fiber.

[0013] In the present invention, the average diameter and average length of the modified natural fibers are measured using a two-dimensional measurement method. Specifically, 200 modified natural fibers are randomly selected, their diameters and lengths are measured, and the average values ​​are calculated, representing the average diameter and average length of the modified natural fibers after that modification. In the present invention, the antimicrobial chemical components in the natural fibers can enhance the antimicrobial function of the polyolefin composition, thereby achieving a good antimicrobial effect in the polyolefin composition without the need for adding a large amount of antimicrobial agent. This can reduce the amount of antimicrobial agent added and reduce costs.

[0014] Natural fibers generally have an average diameter of over 100 μm. To obtain the modified natural fibers of the present invention, the fibers must be treated to reduce their average diameter. Steam explosion is chosen for this purpose because, while it effectively reduces the average diameter and length of natural fibers, its addition to a polyolefin composition enhances the rigidity and surface hardness of the polyolefin composition, making it less susceptible to damage from animal bites. Furthermore, the fiber surface becomes rougher and more prickly, with portions of the fibers exposed to the surface of the polyolefin composition, creating a strong prickly sensation and preventing animal bites.

[0015] In addition, the small average diameter of the modified natural fiber is also conducive to the full overflow of the antibacterial components in the natural fiber, thereby improving the antibacterial function of the polyolefin composition.

[0016] More specifically, the modified natural fiber is prepared by soaking the natural fiber in an alkali solution, washing it with water, and then subjecting it to a steam explosion treatment.

[0017] Natural fibers generally consist of cellulose, hemicellulose, and lignin. Soaking in alkali solution breaks down the fibers, removing the hemicellulose and lignin from the fibers. This separates the components of the natural fibers, reduces impurities, and significantly increases the cellulose content. The resulting natural fibers are stronger and have a better stiffness-enhancing effect.

[0018] After soaking the natural fiber in the alkali solution, it can be washed with clean water several times to remove the alkali residue. The washed natural fiber is placed in a constant temperature oven to dry for subsequent steam explosion treatment.

[0019] More preferably, the natural fiber is ramie fiber.

[0020] Preferably, the average diameter of the ramie fiber raw material is 100 to 300 μm.

[0021] The average diameter of the ramie fiber raw material is relatively small, which is more conducive to steam explosion to obtain modified ramie fiber with an average diameter of no more than 100 μm.

[0022] Preferably, the amount of the modified natural fiber is preferably 10 to 45 parts, for example, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, etc.

[0023] The average diameter of the modified ramie fiber can be adjusted by controlling the number of steam explosions. A larger number of steam explosions is beneficial to reducing the average diameter of the modified ramie fiber.

[0024] As a preferred implementation method, when steam explosion is used to obtain modified natural fibers, the number of steam explosions is preferably 2 to 5 times, more preferably 2 to 4 times, and even more preferably 2 to 3 times.

[0025] As a preferred implementation method, when steam explosion is used to obtain the modified natural fiber, the pressure of the steam explosion is generally 0.5 to 10 MPa, and more preferably, the pressure of the steam explosion is more preferably 4 to 6 MPa.

[0026] In the field, steam explosion pressures typically range from 0.5 to 10 MPa. Lower pressures result in less tearing force on natural fibers, resulting in larger diameter modified natural fibers, poor stiffness enhancement, and low antibacterial properties. Higher pressures prevent further reduction in the tear diameter of natural fibers and slightly reduce the average fiber length, making further improvement in stiffness enhancement difficult.

[0027] Preferably, the moisture content of the natural fiber after washing is 10-50%.

[0028] More preferably, the moisture content of the natural fiber after washing is 20 to 40%.

[0029] Preferably, the average diameter of the modified natural fiber is 5 to 95 μm, or 5 to 90 μm, or 15 to 90 μm, or 15 to 75 μm.

[0030] More preferably, the average diameter of the modified natural fiber is 15 to 30 μm. With a suitable average diameter, the modified natural fiber can significantly improve the rigidity and hardness, thereby improving the chewing performance.

[0031] Steam explosion not only reduces the average length of the natural fibers, but also the average diameter of the modified natural fibers. To prevent a significant decrease in the hardness of the polyolefin composition, the average length of the modified ramie fibers is controlled to 1-4 mm, or 1.5-4 mm, or 2-3.5 mm. More preferably, the modified natural fibers have an average diameter of 5-95 μm and an average length of 1-4 mm. More preferably, the modified natural fibers have an average diameter of 5-90 μm and an average length of 1.5-4 mm. More preferably, the modified natural fibers have an average diameter of 15-90 μm and an average length of 1.5-4 mm. More preferably, the modified natural fibers have an average diameter of 15-75 μm and an average length of 1.5-3.5 mm. More preferably, the modified natural fibers have an average diameter of 15-30 μm and an average length of 1.5-3.5 mm.

[0032] Preferably, the amount of the modified natural fiber is not less than 8% by weight of the total weight of the polyolefin composition.

[0033] More preferably, the amount of the modified natural fiber is 10-20% by weight of the total weight of the polyolefin composition.

[0034] The modified natural fiber has a higher weight percentage in the polyolefin composition, which is beneficial for the natural fiber to be exposed on the surface of the polyolefin composition, thereby producing a stronger pricking sensation in the mouth, preventing animals from gnawing, and increasing the service life.

[0035] The main function of the compatibilizer is to improve the interfacial compatibility between polyolefin resin and natural fiber, and to increase rigidity and surface hardness.

[0036] Preferably, the compatibilizer includes a graft polymer of maleic anhydride and its derivatives, and the polymer is one or more of ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), and ethylene-methyl acrylate copolymer (EMA).

[0037] Because pigs have numerous olfactory receptors in their noses and are particularly averse to pungent odors such as sourness, the compatibilizer of the present invention contains acidic groups in both the polymer and the polar monomer, which together create a distinct sour smell. This can induce fear and avoidance in pigs, further preventing composite materials made from the polyolefin composition from being chewed by animals, particularly pigs.

[0038] In the compatibilizer, more acidic components can further enhance the antibacterial efficiency.

[0039] Flame retardants can improve the flame retardancy of polyolefin compositions, particularly meeting the fire protection requirements of high-density, factory-based livestock farming. Preferably, the flame retardant comprises one or more of a hypophosphite flame retardant or a decabromodiphenylethane flame retardant. More preferably, the flame retardant is a hypophosphite flame retardant.

[0040] When decabromodiphenylethane is used as a flame retardant, antimony white can be selected as a synergist to form a flame retardant combination.

[0041] The phosphinate flame retardant and the decabromodiphenylethane flame retardant are acidic in nature, which helps stimulate the olfactory receptors of the pig's nose, generating an avoidance reaction, and further preventing the composite material prepared from the polyolefin composition from being bitten by animals, especially pigs.

[0042] Preferably, the hypophosphite flame retardant is one or two of aluminum hypophosphite, diethyl aluminum hypophosphite, diisopropyl aluminum hypophosphite, diisobutyl aluminum hypophosphite, diethyl lanthanum hypophosphite, diisopropyl lanthanum hypophosphite, diisobutyl lanthanum hypophosphite, diethyl cerium hypophosphite, diisopropyl cerium hypophosphite, diisobutyl cerium hypophosphite, diethyl zinc hypophosphite, diisopropyl zinc hypophosphite, diisobutyl zinc hypophosphite, diethyl magnesium hypophosphite, diisopropyl magnesium hypophosphite, and diisobutyl magnesium hypophosphite.

[0043] Furthermore, the acidic components in compatibilizers and flame retardants can also enhance antibacterial efficacy. This is because an acidic environment inactivates bacteria. The synergistic effect of compatibilizers and flame retardants further enhances antibacterial efficacy.

[0044] In practical applications, the polyolefin resin is one or more of high-density polyethylene, low-density polyethylene, linear low-density polyethylene or polypropylene.

[0045] Preferably, the polyolefin resin is polypropylene, which may be copolymerized polypropylene or homopolymerized polypropylene, and has a melt index of 0.1 g / 10 min to 100 g / 10 min under the test conditions of 230° C. / 2.16 kg.

[0046] In practical applications, antioxidants, lubricants and other additives may also be added according to actual performance requirements.

[0047] Preferably, the processing aid is added without affecting the performance of the material and can be a commonly used processing aid for polyolefin compositions. More specifically, the processing aid includes a colorant, an antioxidant, and / or a lubricant. The amount of the processing aid is adjusted as needed. Preferably, the antioxidant is added in an amount of 0.1-1 part. Preferably, the lubricant is added in an amount of 0.1-1 part.

[0048] The antioxidant is one or more of phenol, phosphite, divalent sulfur or hindered amine antioxidants.

[0049] The lubricant is one or more of amides, metal soaps and low molecular weight esters. Low molecular weight ester lubricants refer to lower alcohol esters formed from fatty acids, wherein the number of carbon atoms in the fatty acid generally does not exceed 20.

[0050] The present invention also protects a method for preparing the polyolefin composition, comprising the following steps: mixing the components, and melt-extruding the components at 180-210° C. through a twin-screw extruder to obtain the polyolefin composition.

[0051] The present invention also protects the use of the polyolefin composition in the preparation of animal farm facilities. The animal farm facilities are preferably components of floor systems in the farming industry, specifically floor mats and other facilities.

[0052] The polyolefin composition of the present invention has the functions of anti-bite, antibacterial, flame retardant and fireproof, and improves the service life of the material prepared from the composition.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] The present invention discloses a polyolefin composition. Through the synergistic effect of modified natural fibers and flame retardants, the rigidity and surface hardness of the polyolefin composition are improved, the surface of the polyolefin composition is given a prickly feeling when bitten by animals, and the antibacterial function of the polyolefin composition is enhanced. Therefore, the polyolefin composition has excellent animal resistance, flame retardancy, fire resistance and antibacterial properties, and is suitable for use in floor systems in the breeding industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is the SEM image of modified ramie fiber 1. DETAILED DESCRIPTION

[0056] The present invention will be further described below in conjunction with specific embodiments, but the examples do not limit the present invention in any form. Unless otherwise specified, the raw materials and reagents used in the examples of the present invention are conventionally purchased raw materials and reagents.

[0057] The polyolefin resin is polypropylene, manufactured by Zhenhai Refining and Chemical Company, with the brand name SP179;

[0058] Modified ramie fiber 1 was prepared by the following method: commercially available bundled ramie fibers with an average diameter of 200 μm were uniformly cut into approximately 4 mm long staple fibers. The staple fibers were then soaked in a 2 wt% NaOH solution for 8 hours, washed several times with water to remove any residual sodium hydroxide, and dried in a constant temperature oven at 60°C to a moisture content of 30%. The fibers were then added to the hopper of a steam explosion machine and subjected to dispersed steam explosion three times, each at a pressure of 5 MPa. The fibers were then washed several times with water and dried in an oven at 80°C for 24 hours. The resulting treated ramie fibers, designated as modified ramie fiber 1, had an average diameter of 15 μm and an average length of 3.5 mm.

[0059] The preparation method of modified ramie fiber 2 is the same as that of Example 1, except that the moisture content of the ramie fiber after washing is 30%, the number of dispersed steam explosions is reduced to 2, and the steam explosion pressure is 5 MPa each time. The average diameter of modified ramie fiber 2 is 30 μm and the average length is 3.6 mm.

[0060] The preparation method of modified ramie fiber 3 is the same as that of Example 2, except that the moisture content of the ramie fiber after washing is 30%, the number of dispersed steam explosions is reduced to 1, the steam explosion pressure is 5 MPa each time, and the average diameter of modified ramie fiber 3 is 50 μm and the average length is 3.8 mm.

[0061] Natural fiber 4: commercially available ramie long fiber with an average diameter of 200 μm and an average length greater than 1 cm.

[0062] Modified Ramie Fiber 5: Commercially available ramie fiber bundles with an average diameter of 200 μm were evenly cut into 4 mm long staple fibers. These staple fibers were then soaked in a 2 wt% NaOH solution for 1.5 hours and washed several times with water to remove any residual sodium hydroxide. The rinsed staple fibers were then dried in a constant temperature oven at 80°C for 24 hours. This fiber, designated Modified Ramie Fiber 5, had an average diameter of 160 μm and an average length of 4 mm.

[0063] The preparation method of modified ramie fiber 6 is the same as that of Example 1, except that before steam explosion, the ramie is dried to a moisture content of 10%, the number of dispersed steam explosions is 3, and the steam explosion pressure is 5 MPa each time. The average diameter of modified ramie fiber 6 is 60 μm and the average length is 3.5 mm.

[0064] The preparation method of modified ramie fiber 7 is the same as that of Example 1, except that the ramie is dried to a moisture content of 50%, the dispersed steam explosion is performed three times, and the steam explosion pressure is 5 MPa each time. The average diameter of the modified ramie fiber 7 is 75 μm and the average length is 3.6 mm.

[0065] The preparation method of modified ramie fiber 8 is the same as that of Example 1, except that the ramie is dried to a moisture content of 30%, the dispersed steam explosion is performed three times, and the steam explosion pressure is 0.5 MPa each time. The average diameter of the modified ramie fiber 8 is 90 μm and the average length is 3.9 mm.

[0066] The preparation method of modified ramie fiber 9 is the same as that of Example 1, except that the ramie is dried to a moisture content of 30%, the dispersed steam explosion is performed three times, and the steam explosion pressure is 10 MPa each time. The average diameter of the modified ramie fiber 9 is 15 μm and the average length is 2.0 mm.

[0067] It can be seen from the modified ramie fiber 9 that when the fiber diameter has been reduced to a certain value, it becomes difficult to further reduce the diameter.

[0068] Modified ramie fiber 10 was prepared in the same manner as in Example 1, except that it was steam-exploded five times, each time at a pressure of 5 MPa. The fibers were then washed several times with clean water and dried in an oven at 80°C for 24 hours. This produced treated ramie fibers, designated modified ramie fibers 10. The fibers had an average diameter of 14 μm and an average length of 1.5 mm.

[0069] Compatibilizer 1: Ethylene vinyl acetate copolymer grafted maleic anhydride, EVA-g-MAH, manufactured by Dow Chemical, USA, brand C250.

[0070] Compatibilizer 2: ethylene-ethyl acrylate copolymer grafted maleic anhydride, EEA-g-MAH, manufactured by Arkema, France, brand Lotader 3210.

[0071] Compatibilizer 3: Polypropylene grafted maleic anhydride, PP-g-MAH, manufactured by Bochen Polymer New Materials Co., Ltd., brand AD-105.

[0072] Flame retardant 1: aluminum hypophosphite, manufactured by Shanghai Lidao New Materials Co., Ltd., brand M-116.

[0073] Flame retardant 2: composed of decabromodiphenylethane and antimony white, with a mass ratio of 3:1.

[0074] Flame retardant 3: composed of ammonium polyphosphate and polysiloxane, and the mass ratio of ammonium polyphosphate to polysiloxane is 3:1.

[0075] Antioxidant: phosphite; commercially available and the same one was used in both the parallel examples and comparative examples.

[0076] Lubricant: amide, commercially available and the same one was used in both the examples and comparative examples.

[0077] Examples 1 to 14

[0078] A polyolefin composition comprising the following components in parts by weight:

[0079] Polyolefin resin; modified ramie fiber; compatibilizer; flame retardant; processing aid;

[0080] The processing aids are antioxidants and lubricants, and the specific content of each component is shown in Table 1 below.

[0081] Table 1 Composition of the polyolefin composition of each embodiment (in parts by weight)

[0082]

[0083]

[0084]

[0085] The preparation method of the above-mentioned polyolefin composition is specifically as follows:

[0086] The components are weighed according to the formula ratio, and the polyolefin resin, ramie fiber, compatibilizer, flame retardant, antioxidant and lubricant are uniformly mixed in a high-speed mixer to obtain a mixed material.

[0087] The mixed material is added to a twin-screw extruder with an extrusion screw length-diameter ratio of 36-48:1. After mixing, melting, and homogenization, the material is extruded into granules. The extruder temperature is set at 80-120° C. in zone 1, 180-200° C. in zones 2-5, and 200-210° C. in zones 6-8. The polyolefin composition is obtained after granulation.

[0088] Comparative Examples 1-2

[0089] A polyolefin composition comprising the following components in parts by weight:

[0090] Polyolefin resin; ramie fiber; compatibilizer; flame retardant; processing aid;

[0091] The processing aids are antioxidants and lubricants, and the specific content of each component is shown in Table 2 below.

[0092] Table 2 Composition of the polyolefin compositions of each comparative example (in parts by weight)

[0093]

[0094]

[0095] The preparation method of the polyolefin composition is the same as that in the embodiment.

[0096] Result detection

[0097] The polyolefin compositions of the above examples and comparative examples were tested by the following performance testing methods:

[0098] (1) Flexural modulus test: Test the flexural modulus of the material in accordance with ISO 178-2010.

[0099] (2) Anti-gnawing test: Three flat plastic sheets with a length of 1000 mm, a width of 500 mm, and a wall thickness of 4 mm were extruded and laid on the surface of the cement slatted floor in the fattening house of a pig farm. The fattening house was used to house 10 pigs, and the test period was set to 14 days. The area of ​​the area where the pigs gnawed and the depth of the gnawing were then calculated.

[0100] (3) Antibacterial rate test: 100*100*2 mm plastic specimens were prepared and the antibacterial rate was tested according to ISO 22196-2011.

[0101] (4) Vertical burning test: According to UL94-2022 standard, the thickness of the test specimen is 3.2 mm.

[0102] (5) Hardness: Test the Rockwell hardness of the material in accordance with GB / T 3398.2-2008.

[0103] The specific test results are shown in Table 3 below:

[0104]

[0105]

[0106] From the above data, it can be seen that the polyolefin composition of the present invention has anti-gnawing, antibacterial, flame retardant and fireproof functions, and is applicable to polyolefin mats and other components used in floor systems in the aquaculture industry. The polyolefin composition of the present invention has a high flexural modulus of 1232 to 4675 MPa and a hardness of 60 to 90, which can prevent animals, especially pigs, from gnawing, and the gnawing area is less than 920 cm 2 The biting depth is less than 2.5mm, the antibacterial rate can reach 60-90%, and the flame retardant grade can reach HB or above.

[0107] It can be seen from Examples 1 and 4 to 7 that steam explosion times of 2 to 3 times and a moisture content of 20 to 40% of the ramie fiber after washing are more conducive to improving the bending modulus and hardness, reducing the area and depth of the animal gnawing area, and increasing the release of antibacterial components, thereby improving the antibacterial rate.

[0108] It can be seen from Examples 1 and 8 to 9 that, among the polymers of the polyolefin composition compatibilizer, the polymers being ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer are more conducive to reducing the area of ​​the animal's gnawing region, reducing the gnawing depth, and improving the antibacterial rate compared to the polymer being polypropylene.

[0109] As can be seen from Examples 1, 10, and 11, polyolefin compositions using hypophosphite flame retardants or a combination of decabromodiphenylethane and antimony white flame retardants are more effective than ammonium polyphosphate flame retardants in reducing the area and depth of animal bites, while also improving antibacterial efficacy. Furthermore, hypophosphite flame retardants, due to their potential to form hypophosphorous acid, are highly acidic and offer significant antibacterial and anti-bite properties.

[0110] It can be seen from the examples and comparative example 1 that the average diameter of the natural fibers is too large, the area of ​​the animal biting is too large, and the biting depth is too great, which greatly reduces the service life of the polyolefin composition material.

[0111] It can be seen from the embodiment and comparative example 2 that the modified ramie fiber 5 has not been subjected to blasting treatment, and the area bitten by animals is too large and the biting depth is too great, which greatly reduces the service life of the polyolefin composition material.

[0112] As can be seen from Examples 1, 12, 13, and 14, a slightly lower burst pressure results in less tearing force on the ramie fibers, resulting in a larger diameter of the modified ramie fibers, a weaker stiffening effect on polyolefins, a slightly larger area and depth of the animal bite zone, and a low antibacterial rate. A slightly higher burst pressure does not further reduce the tear diameter of the ramie fibers, and the average length decreases, making it difficult to further enhance the stiffening effect. Consequently, the area and depth of the animal bite zone remain unchanged, and the antibacterial rate increases slightly. A higher burst pressure results in more fragmented modified ramie fibers, meaning their average length decreases further, weakening their stiffening effect on polyolefins. The area and depth of the animal bite zone are slightly larger, and the antibacterial rate is low. Overall, optimal results are achieved when the average diameter of the modified natural fibers is between 15 and 30 μm and the average length is between 1.5 and 3.5 mm. Beyond these ranges, the performance decreases.

[0113] from Figure 1 It can be seen that after the modified ramie fiber is treated, the fiber surface becomes rough and has a prickly end morphology.

[0114] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A polyolefin composition, characterized in that Calculated by weight, it includes the following components: 20-98 parts of polyolefin resin; 8-50 parts of modified natural fiber; Compatibilizer 0.5~20 parts; 1~10 parts of flame retardant; 0.1~2 parts of processing aid; The modified natural fiber is a natural fiber obtained by alkali solution soaking, water washing, and steam explosion treatment, and the average diameter of the modified natural fiber is no more than 100 μm and the average length is 1 to 4 mm; The natural fiber is one or more of ramie fiber, jute fiber and bamboo fiber; The compatibilizer includes maleic anhydride and its derivative graft polymer.

2. The polyolefin composition according to claim 1, wherein The average diameter of the modified natural fiber is 5-95 μm.

3. The polyolefin composition according to claim 1, wherein The average length of the modified natural fiber is 1.5-4 mm.

4. The polyolefin composition according to claim 1, wherein The compatibilizer includes maleic anhydride and its derivative graft polymer; the polymer is one or more of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-methyl acrylate copolymer.

5. The polyolefin composition according to claim 1, wherein The flame retardant includes one or more of hypophosphite flame retardant and decabromodiphenylethane flame retardant.

6. The polyolefin composition according to claim 1, wherein The polyolefin resin includes one or more of high-density polyethylene, low-density polyethylene, linear low-density polyethylene or polypropylene.

7. The polyolefin composition according to claim 1, wherein The processing aids include colorants, antioxidants and / or lubricants.

8. The method for preparing the polyolefin composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: mixing the components, and melting and extruding the components at 180-210° C. through a twin-screw extruder to obtain the polyolefin composition.

9. Use of the polyolefin composition according to any one of claims 1 to 7 in the preparation of animal farm facilities.

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