Modified polyolefin elastomer and preparation method thereof

Abstract

The invention belongs to the technical field of polyolefin preparation, and discloses a modified polyolefin elastomer and a preparation method thereof, and the modified polyolefin elastomer comprises the following components: ethylene, alpha-olefin, a main catalyst, a cocatalyst, a chemical cross-linking agent and a biodegradable additive. The preparation method comprises the following steps: uniformly mixing ethylene, alpha-olefin, a main catalyst, a cocatalyst, a chemical cross-linking agent and a biodegradable additive according to the proportion, transferring the mixed raw materials into a polymerization reaction kettle, and carrying out polymerization reaction at proper temperature and pressure. After the ethylene, the alpha-olefin, the main catalyst, the cocatalyst, the chemical cross-linking agent and the biodegradable additive are proportioned according to corresponding numerical values, the elasticity, the heat resistance and the solvent resistance of the modified polyolefin elastomer can be improved, and the permanent deformation of the material in the use process is avoided; the performance of the polyolefin elastomer is prevented from being reduced in a high-temperature environment, the resistance of the modified polyolefin elastomer to an organic solvent is enhanced, and the risk of swelling or dissolving is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of polyolefin preparation, and specifically relates to a modified polyolefin elastomer and a preparation method thereof. Background Art

[0002] Polyolefin elastomers have been widely used in many fields due to their excellent physical properties and chemical stability. However, traditional polyolefin elastomers still have limitations in certain properties, especially in elasticity, heat resistance and solvent resistance, which restrict their use in more demanding application environments.

[0003] Current polyolefin elastomers have limited elastic recovery capabilities when subjected to external forces, causing the material to easily undergo permanent deformation during use. In addition, in high temperature environments, the performance of traditional polyolefin elastomers will significantly decrease, causing the material to soften and reduce its strength. Summary of the invention

[0004] The object of the present invention is to provide a modified polyolefin elastomer to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0006] Ethylene;

[0007] α-olefins;

[0008] Main catalyst;

[0009] Promoter catalyst;

[0010] Chemical cross-linking agents;

[0011] Biodegradable additives;

[0012] The content of the ingredients is:

[0013] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of the main catalyst is controlled at 0.1-0.5wt%, the content of the co-catalyst is controlled at 0.5-1.0wt%, the content of the chemical cross-linking agent is controlled at 0.5-1.0wt%, and the content of the biodegradable additive is controlled at 5-10wt%.

[0014] As a further solution of the present invention: the main catalyst is Cp2ZrCl2 (zirconocene dichloride), and the co-catalyst is triethylaluminum (TEAl).

[0015] As a further solution of the present invention: the chemical cross-linking agent is dicumyl peroxide (DCP) and sulfur, and the biodegradable additive is polylactic acid (PLA), polybutylene succinate (PBS) and starch.

[0016] As a further embodiment of the present invention, the molar ratio of ethylene to α-olefin is controlled within the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0017] As a further solution of the present invention: the molar ratio of Cp2ZrCl2 (zocene zirconium dichloride) to triethylaluminum (TEAl) is controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0018] As a further solution of the present invention: the ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0019] As a further embodiment of the present invention, the mass ratio of the polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled within the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0020] As a further solution of the present invention: the particle size of the biodegradable additive is controlled between 100 mesh and 300 mesh to improve its dispersibility in the polyolefin elastomer.

[0021] A method for preparing a modified polyolefin elastomer, the method comprising the following steps:

[0022] Step 1: Prepare the ingredients

[0023] Ethylene: Weigh 40-60 wt% of ethylene monomer.

[0024] α-Olefin: Weigh 10-20 wt% of α-olefin monomer, and ensure that the molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5.

[0025] Main catalyst: Weigh 0.1-0.5wt% of Cp2ZrCl2 (zirconocene dichloride).

[0026] Co-catalyst: Weigh 0.5-1.0 wt% of triethylaluminum (TEAl), and ensure that the molar ratio of Cp2ZrCl2 to TEAl is controlled in the range of 1:5 to 1:10.

[0027] Chemical cross-linking agent: 0.5-1.0 wt % of dicumyl peroxide (DCP) and sulfur are weighed, and the ratio of DCP to sulfur is controlled in the range of 1:0.5 to 1:1.5.

[0028] Biodegradable additives: 5-10 wt% of polylactic acid (PLA), polybutylene succinate (PBS) and starch are weighed, and their mass ratio is controlled within the range of 1:1:1 to 1:2:2. At the same time, the particle size of the biodegradable additive is controlled between 100 mesh and 300 mesh.

[0029] Step 2: Mix the ingredients

[0030] Ethylene, α-olefin, main catalyst, co-catalyst, chemical cross-linking agent and biodegradable additive are mixed uniformly according to the above proportions.

[0031] Step 3: Polymerization

[0032] The mixed raw materials are transferred to the polymerization reactor.

[0033] The polymerization reaction is carried out at an appropriate temperature and pressure. Usually, the polymerization reaction temperature is controlled at 50-100°C and the pressure is controlled at 0.5-1.0MPa.

[0034] During the polymerization process, stirring was continued to maintain a uniform reaction.

[0035] Step 4: Crosslinking

[0036] After the polymerization reaction is completed, chemical crosslinking agents (DCP and sulfur) are added to carry out the crosslinking reaction at a certain temperature and pressure to achieve a suitable crosslinking density.

[0037] Step 5: Granulation

[0038] After the cross-linking reaction is completed, the obtained polyolefin elastomer is cooled and pelletized to obtain modified polyolefin elastomer particles.

[0039] Step 6: Post-Processing

[0040] The modified polyolefin elastomer particles after granulation are dried, screened and subjected to post-treatment to remove unreacted monomers, catalysts and other impurities to ensure product quality.

[0041] Step 7: Performance Testing

[0042] Carry out performance tests on modified polyolefin elastomers, including elasticity, biodegradability, etc., to ensure that the products meet the requirements.

[0043] The beneficial effects of the present invention are as follows: by proportioning ethylene, α-olefin, main catalyst, co-catalyst, chemical cross-linking agent and biodegradable additive according to corresponding numerical values, the elasticity, heat resistance and solvent resistance of the polyolefin elastomer can be improved, permanent deformation of the material during use can be avoided, and the performance of the polyolefin elastomer can be prevented from decreasing in a high temperature environment. The resistance of the polyolefin elastomer to organic solvents is enhanced, the risk of swelling or dissolution is reduced, and the stability of the material in the presence of specific chemicals is improved. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1:

[0046] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0047] Ethylene;

[0048] α-olefins;

[0049] Primary catalyst;

[0050] Promoter catalyst;

[0051] Chemical cross-linking agents;

[0052] Biodegradable additives;

[0053] The content of ingredients is:

[0054] The ethylene content is controlled at 40-60wt%, the α-olefin content is controlled at 10-20wt%, the main catalyst content is controlled at 0.1-0.5wt%, the co-catalyst content is controlled at 0.5-1.0wt%, the chemical cross-linking agent content is controlled at 0.5-1.0wt%, and the biodegradable additive content is controlled at 5-10wt%.

[0055] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0056] The chemical cross-linking agents are dicumyl peroxide (DCP) and sulfur, and the biodegradable additives are polylactic acid (PLA), polybutylene succinate (PBS) and starch.

[0057] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0058] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0059] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0060] The mass ratio of polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled in the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0061] The particle size of the biodegradable additive is controlled between 100 meshes and 300 meshes to improve its dispersibility in the polyolefin elastomer.

[0062] Embodiment 2:

[0063] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0064] Ethylene;

[0065] α-olefins;

[0066] Main catalyst;

[0067] Promoter catalyst;

[0068] Chemical cross-linking agents;

[0069] The content of ingredients is:

[0070] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, the content of co-catalyst is controlled at 0.5-1.0wt%, and the content of chemical cross-linking agent is controlled at 0.1-0.5wt%.

[0071] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0072] The chemical crosslinking agents are dicumyl peroxide (DCP) and sulfur.

[0073] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0074] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0075] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0076] Embodiment 3:

[0077] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0078] Ethylene;

[0079] α-olefins;

[0080] Primary catalyst;

[0081] Promoter catalyst;

[0082] Chemical cross-linking agents;

[0083] The content of ingredients is:

[0084] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, the content of co-catalyst is controlled at 0.5-1.0wt%, and the content of chemical cross-linking agent is controlled at 0.5-1.0wt%.

[0085] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0086] The chemical crosslinking agent is dicumyl peroxide (DCP).

[0087] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0088] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0089] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0090] Embodiment 4:

[0091] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0092] Ethylene;

[0093] α-olefins;

[0094] Primary catalyst;

[0095] Promoter catalyst;

[0096] Chemical cross-linking agents;

[0097] The content of ingredients is:

[0098] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, the content of co-catalyst is controlled at 0.5-1.0wt%, and the content of chemical cross-linking agent is controlled at 40wt%.

[0099] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0100] The chemical crosslinking agent is dicumyl peroxide (DCP).

[0101] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0102] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0103] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve the appropriate crosslinking density.

[0104] Embodiment 5:

[0105] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0106] Ethylene;

[0107] α-olefins;

[0108] Main catalyst;

[0109] Promoter catalyst;

[0110] Chemical cross-linking agents;

[0111] The content of ingredients is:

[0112] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, the content of co-catalyst is controlled at 0.5-1.0wt%, and the content of chemical cross-linking agent is controlled at 40wt%.

[0113] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0114] The chemical crosslinking agents are dicumyl peroxide (DCP) and sulfur.

[0115] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0116] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0117] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0118] The mass ratio of polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled in the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0119] The particle size of the biodegradable additive is controlled between 100 meshes and 300 meshes to improve its dispersibility in the polyolefin elastomer.

[0120] Embodiment 6:

[0121] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0122] Ethylene;

[0123] α-olefins;

[0124] Main catalyst;

[0125] Promoter catalyst;

[0126] The content of ingredients is:

[0127] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, and the content of co-catalyst is controlled at 0.5-1.0wt%.

[0128] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0129] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0130] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0131]

[0132] As can be seen from Examples 1-5, after using the ratio combination of dicumyl peroxide (DCP) and sulfur with ethylene, α-olefin, main catalyst and co-catalyst, compared with Example 6, it can be seen that this combination can maintain the physical properties and structural stability of the modified polyolefin elastomer under high temperature environment, and is not easy to soften. Moreover, the modified polyolefin elastomer can better recover to its original state after being subjected to external force, reducing the risk of permanent deformation, thereby extending the service life of the material.

[0133] Embodiment 7:

[0134] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0135] Ethylene;

[0136] α-olefins;

[0137] Main catalyst;

[0138] Promoter catalyst;

[0139] Chemical cross-linking agents;

[0140] Biodegradable additives;

[0141] The content of ingredients is:

[0142] The ethylene content is controlled at 40-60wt%, the α-olefin content is controlled at 10-20wt%, the main catalyst content is controlled at 0.1-0.5wt%, the co-catalyst content is controlled at 0.5-1.0wt%, the chemical cross-linking agent content is controlled at 0.5-1.0wt%, and the biodegradable additive content is controlled at 5-10wt%.

[0143] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0144] The chemical cross-linking agents are dicumyl peroxide (DCP) and sulfur, and the biodegradable additives are polylactic acid (PLA), polybutylene succinate (PBS) and starch.

[0145] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0146] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0147] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0148] The mass ratio of polylactic acid (PLA) and starch is controlled in the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0149] The particle size of the biodegradable additive is controlled between 100 meshes and 300 meshes to improve its dispersibility in the polyolefin elastomer.

[0150] Embodiment 8:

[0151] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0152] Ethylene;

[0153] α-olefins;

[0154] Main catalyst;

[0155] Promoter catalyst;

[0156] Chemical cross-linking agents;

[0157] Biodegradable additives;

[0158] The content of ingredients is:

[0159] The ethylene content is controlled at 40-60wt%, the α-olefin content is controlled at 10-20wt%, the main catalyst content is controlled at 0.1-0.5wt%, the co-catalyst content is controlled at 0.5-1.0wt%, the chemical cross-linking agent content is controlled at 0.5-1.0wt%, and the biodegradable additive content is controlled at 10wt%.

[0160] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0161] The chemical cross-linking agents are dicumyl peroxide (DCP) and sulfur, and the biodegradable additives are polylactic acid (PLA), polybutylene succinate (PBS) and starch.

[0162] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0163] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0164] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0165] The mass ratio of polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled in the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0166] The particle size of the biodegradable additive is controlled between 100 mesh and 300 mesh to improve its dispersibility in the polyolefin elastomer.

[0167] Embodiment 9:

[0168] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0169] Ethylene;

[0170] α-olefins;

[0171] Main catalyst;

[0172] Promoter catalyst;

[0173] Chemical cross-linking agents;

[0174] Biodegradable additives;

[0175] The content of ingredients is:

[0176] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, the content of co-catalyst is controlled at 0.5-1.0wt%, the content of chemical cross-linking agent is controlled at 0.5-1.0wt%, and the content of biodegradable additive is controlled at 40wt%.

[0177] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0178] The chemical cross-linking agents are dicumyl peroxide (DCP) and sulfur, and the biodegradable additives are polylactic acid (PLA) and starch.

[0179] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0180] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0181] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0182] The mass ratio of polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled in the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0183] The particle size of the biodegradable additive is controlled between 100 meshes and 300 meshes to improve its dispersibility in the polyolefin elastomer.

[0184] Embodiment 10:

[0185] A modified polyolefin elastomer, the polyolefin elastomer is composed of the following components:

[0186] Ethylene;

[0187] α-olefins;

[0188] Main catalyst;

[0189] Promoter catalyst;

[0190] Chemical cross-linking agents;

[0191] Biodegradable additives;

[0192] The content of ingredients is:

[0193] The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of main catalyst is controlled at 0.1-0.5wt%, the content of co-catalyst is controlled at 0.5-1.0wt%, the content of chemical cross-linking agent is controlled at 0.5-1.0wt%, and the content of biodegradable additive is controlled at 40wt%.

[0194] The main catalyst is Cp2ZrC l 2 (zirconocene dichloride) and the co-catalyst is triethylaluminum (TEAl).

[0195] The chemical cross-linking agents are dicumyl peroxide (DCP) and sulfur, and the biodegradable additives are polylactic acid (PLA), polybutylene succinate (PBS) and starch.

[0196] The molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

[0197] The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) was controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

[0198] The ratio of dicumyl peroxide (DCP) to sulfur is controlled in the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

[0199] The mass ratio of polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled in the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

[0200] The particle size of the biodegradable additive is controlled between 100 meshes and 300 meshes to improve its dispersibility in the polyolefin elastomer.

[0201]

[0202] As can be seen from Examples 7-10, by using polylactic acid (PLA), polybutylene succinate (PBS) and starch in a mixed ratio, the time it takes for the material to be decomposed by microorganisms under certain conditions is reduced. Biodegradable modification helps reduce the accumulation of plastic waste in the environment, especially reducing the pollution of soil and water sources. Biodegradable materials can be decomposed in the natural environment and converted into carbon dioxide, water and other harmless substances. These substances can re-enter the ecological cycle, which helps to achieve the recycling of materials.

[0203] From the above, it can be seen that the combination of dicumyl peroxide (DCP) and sulfur with ethylene, α-olefin, main catalyst and co-catalyst increases the heat resistance of polyolefin elastomer, improves the elastic recovery ability and solvent resistance, enhances the durability and reliability of the material, and expands the application range of the material in high temperature environments. By adding polylactic acid (PLA), polybutylene succinate (PBS) and starch, the time for polyolefin elastomer to be decomposed by microorganisms can be increased, while improving waste treatment and resource recovery efficiency.

[0204] Finally, a few points should be explained: Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modified polyolefin elastomer, characterized in that: The polyolefin elastomer is composed of the following components: Ethylene; α-olefins; Main catalyst; Promoter catalyst; Chemical cross-linking agents; Biodegradable additives; The content of the ingredients is: The content of ethylene is controlled at 40-60wt%, the content of α-olefin is controlled at 10-20wt%, the content of the main catalyst is controlled at 0.1-0.5wt%, the content of the co-catalyst is controlled at 0.5-1.0wt%, the content of the chemical cross-linking agent is controlled at 0.5-1.0wt%, and the content of the biodegradable additive is controlled at 5-10wt%.

2. A modified polyolefin elastomer according to claim 1, characterized in that: The main catalyst is Cp2ZrCl2 (zirconocene dichloride), and the co-catalyst is triethylaluminum (TEAl).

3. A modified polyolefin elastomer according to claim 1, characterized in that: The chemical cross-linking agent is dicumyl peroxide (DCP) and sulfur, and the biodegradable additive is polylactic acid (PLA), polybutylene succinate (PBS) and starch.

4. A modified polyolefin elastomer according to claim 1, characterized in that: The molar ratio of ethylene to α-olefin is controlled within the range of 1:0.5 to 1:1.5 to optimize the elastic properties of the material.

5. A modified polyolefin elastomer according to claim 2, characterized in that: The molar ratio of Cp2ZrCl2 (zirconocene dichloride) to triethylaluminum (TEAl) is controlled in the range of 1:5 to 1:10 to optimize the catalytic effect.

6. A modified polyolefin elastomer according to claim 3, characterized in that: The ratio of dicumyl peroxide (DCP) to sulfur is controlled within the range of 1:0.5 to 1:1.5 to achieve a suitable crosslinking density.

7. A modified polyolefin elastomer according to claim 3, characterized in that: The mass ratio of the polylactic acid (PLA), polybutylene succinate (PBS) and starch is controlled within the range of 1:1:1 to 1:2:2 to achieve good biodegradability.

8. The modified polyolefin elastomer according to claim 1, characterized in that: The particle size of the biodegradable additive is controlled between 100 meshes and 300 meshes to improve its dispersibility in the polyolefin elastomer.

9. A method for preparing a modified polyolefin elastomer, the method comprising the following steps: Step 1: Prepare the ingredients Ethylene: Weigh 40-60 wt% of ethylene monomer. α-Olefin: Weigh 10-20 wt% of α-olefin monomer, and ensure that the molar ratio of ethylene to α-olefin is controlled in the range of 1:0.5 to 1:1.

5. Main catalyst: Weigh 0.1-0.5wt% of Cp2ZrCl2 (zirconocene dichloride). Co-catalyst: Weigh 0.5-1.0 wt% of triethylaluminum (TEAl), and ensure that the molar ratio of Cp2ZrCl2 to TEAl is controlled in the range of 1:5 to 1:

10. Chemical cross-linking agent: 0.5-1.0 wt % of dicumyl peroxide (DCP) and sulfur are weighed, and the ratio of DCP to sulfur is controlled in the range of 1:0.5 to 1:1.

5. Biodegradable additives: 5-10 wt% of polylactic acid (PLA), polybutylene succinate (PBS) and starch are weighed, and their mass ratio is controlled within the range of 1:1:1 to 1:2:

2. At the same time, the particle size of the biodegradable additive is controlled between 100 mesh and 300 mesh. Step 2: Mix the ingredients Ethylene, α-olefin, main catalyst, co-catalyst, chemical cross-linking agent and biodegradable additive are mixed uniformly according to the above proportions. Step 3: Polymerization The mixed raw materials are transferred to the polymerization reactor. The polymerization reaction is carried out at an appropriate temperature and pressure. Usually, the polymerization reaction temperature is controlled at 50-100°C and the pressure is controlled at 0.5-1.0MPa. During the polymerization process, stirring was continued to maintain a uniform reaction. Step 4: Crosslinking After the polymerization reaction is completed, chemical crosslinking agents (DCP and sulfur) are added to carry out the crosslinking reaction at a certain temperature and pressure to achieve a suitable crosslinking density. Step 5: Granulation After the cross-linking reaction is completed, the obtained polyolefin elastomer is cooled and pelletized to obtain modified polyolefin elastomer particles. Step 6: Post-Processing The modified polyolefin elastomer particles after granulation are dried, screened and subjected to post-treatment to remove unreacted monomers, catalysts and other impurities to ensure product quality. Step 7: Performance Testing Carry out performance tests on modified polyolefin elastomers, including elasticity, biodegradability, etc., to ensure that the products meet the requirements.

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