A barium sulfate surface treatment aid, a preparation method, application and a barium sulfate filled polyolefin elastomer material

Abstract

This invention belongs to the field of polymer composite materials and discloses a barium sulfate surface treatment aid, its preparation method, its application, and a barium sulfate-filled polyolefin elastomer material. The barium sulfate surface treatment aid comprises a block copolymer composed of polyethylene glycol monomethyl ether (mPEG) and methyl methacrylate (MMA), wherein the molar ratio of mPEG to MMA is 1:1-4, and the theoretical molecular weight of the barium sulfate surface treatment aid is 300-600. This invention prepares an mPEG-MMA block copolymer composed of polyethylene glycol monomethyl ether (mPEG) and methyl methacrylate (MMA) through oxyanionic polymerization. This copolymer can be fully incorporated into the barium sulfate surface as a barium sulfate surface treatment aid, reducing its hydrophilicity and overcoming the characteristic of barium sulfate's poor compatibility with polymers. This allows the surface-treated barium sulfate to fully combine with the polyolefin elastomer components and achieve highly uniform dispersion, further improving the overall performance of the barium sulfate-filled polyolefin elastomer material.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials, specifically, it relates to a barium sulfate surface treatment aid, its preparation method, its application, and a barium sulfate-filled polyolefin elastomer material. Background Technology

[0002] Barium sulfate is an inorganic salt compound that plays a crucial role in polymer material preparation due to its unique high stability, chemical inertness, low odor, low emission, and excellent radiation shielding properties. Combining polymers with barium sulfate not only reduces costs but also improves the mechanical properties, weather resistance, and flame retardancy of materials, while also imparting radiation shielding functionality. More importantly, barium sulfate's good chemical stability and biocompatibility make it suitable as a filler component in medical polymer elastomer materials; many medical polymer materials with radiographic imaging capabilities use barium sulfate as their primary filler component.

[0003] However, as an inorganic compound, barium sulfate has a highly polar surface and significant hydrophilicity, leading to poor compatibility between barium sulfate and polymers. Untreated barium sulfate particles are difficult to disperse in polymers and tend to exist in aggregated structures. The inorganic characteristics of barium sulfate result in suboptimal overall material performance after being composited with polymer fillers, and barium sulfate easily accumulates and precipitates on the material surface, negatively impacting the material's appearance. Especially for elastomer materials, insufficiently dispersed barium sulfate can significantly negatively affect the material's elasticity and fatigue resistance. To overcome these problems, surface treatment of barium sulfate is particularly important.

[0004] Surface treatment can introduce polymer-compatible groups or functional groups onto the surface of barium sulfate particles, thereby enhancing their interaction with the polymer and improving dispersion stability. Furthermore, surface treatment can alter the surface properties of barium sulfate particles, such as reducing surface energy and improving wettability, inhibiting the self-aggregation tendency of barium sulfate particles filled in the polymer, and further improving the dispersion effect of barium sulfate particles in the polymer. Currently, barium sulfate products used as fillers in polyolefin elastomers are typically surface-treated.

[0005] For example, Chinese patent application CN112662059A discloses a barium sulfate masterbatch for plastic pipes and its preparation method. First, sulfur is dispersed on the surface of barium sulfate. Then, SBS is thermally melted and dispersed on the surface of barium sulfate with the assistance of paraffin. The SBS is vulcanized at a suitable temperature. The surface of the pulverized barium sulfate fine powder is firmly coated with vulcanized SBS. Then, it is mixed with polypropylene carrier resin and granulated to obtain the masterbatch.

[0006] However, existing barium sulfate surface treatment additives and methods on the market still have some shortcomings. On the one hand, some surface treatment additives have limited binding effects with barium sulfate, resulting in poor treatment results; on the other hand, some treatment methods are complex to operate and costly, limiting their application in industrial production. In addition, some treatment methods may also have adverse effects on the physical properties of barium sulfate, such as reducing its density or stability.

[0007] Therefore, addressing the shortcomings of existing barium sulfate surface treatment methods, the development of novel and efficient barium sulfate surface treatment auxiliaries and corresponding application methods is of significant practical importance and promising application prospects. Designing and modifying the molecular structure of auxiliaries to enable them to fully and efficiently bind with barium sulfate, thereby altering the hydrophilic and highly polar characteristics of the barium sulfate surface and strengthening the bonding between barium sulfate and polymers, is key to the design and application development of barium sulfate surface auxiliaries.

[0008] In view of this, the present invention is proposed. Summary of the Invention

[0009] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a barium sulfate surface treatment aid, its preparation method, its application, and a barium sulfate-filled polyolefin elastomer material. This invention prepares an mPEG-MMA block copolymer composed of polyethylene glycol monomethyl ether (mPEG) and methyl methacrylate (MMA) through oxyanionic polymerization. This mPEG-MMA copolymer can be fully incorporated into the barium sulfate surface as a barium sulfate surface treatment aid, overcoming the characteristic of barium sulfate's poor compatibility with polymers. This allows the surface-treated barium sulfate to fully integrate with the polyolefin elastomer components and achieve highly uniform dispersion, further improving the overall performance of the barium sulfate-filled polyolefin elastomer material.

[0010] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0011] This invention provides a barium sulfate surface treatment aid, mPEG-MMA, composed of polyethylene glycol monomethyl ether (mPEG) and methyl methacrylate (MMA), prepared by oxyanionic polymerization. Based on the characteristics of this aid, its application in barium sulfate surface modification is clarified, as well as the application of the correspondingly modified barium sulfate in polyolefin elastomers. Verification confirms that mPEG-MMA was successfully synthesized according to the intended structure, and that the designed method can fully integrate with barium sulfate and improve its surface characteristics. Further comparison confirms that the polyolefin composite material with surface-treated barium sulfate containing mPEG-MMA exhibits better mechanical properties and more ideal elasticity. The process of surface-treating barium sulfate using mPEG-MMA is simple and easy to implement. The surface-treated barium sulfate can also be compounded with polyolefin elastomers via conventional twin-screw melt extrusion to prepare corresponding elastomer composite materials, making continuous industrial production easily achievable.

[0012] In a first aspect, the present invention provides a barium sulfate surface treatment aid comprising a block copolymer composed of polyethylene glycol monomethyl ether (mPEG) and methyl methacrylate (MMA), wherein the molar ratio of the polyethylene glycol monomethyl ether to the methyl methacrylate is 1:1-4, and the theoretical molecular weight of the barium sulfate surface treatment aid is 300-600.

[0013] In a further embodiment, the block copolymer contains polyethylene glycol monomethyl ether with an average number of 4-5 repeating units and methyl methacrylate with 1-4 repeating units.

[0014] The mPEG-MMA of this invention is a block copolymer of ethylene glycol and acrylate. The ester groups react with the hydroxyl groups on the surface of barium sulfate at high temperatures, promoting the full adhesion of mPEG-MMA to the barium sulfate surface and achieving modification of the barium sulfate. Simultaneously, the polyether structure in the polyethylene glycol segments can also bind to the hydroxyl groups on the barium sulfate surface via hydrogen bonds, thereby achieving the coating of the surface treatment agent mPEG-MMA on the barium sulfate surface. This minimizes the exposed hydrophilic groups on the barium sulfate surface, improves the affinity between barium sulfate and polymer components, and reduces its self-aggregation tendency.

[0015] This invention obtains a barium sulfate surface treatment additive with a desired molecular weight by controlling the addition ratio of polyethylene glycol monomethyl ether (mPEG) and methyl methacrylate (MMA). The mPEG-MMA block copolymer of this invention has a specific repeating unit structure and a narrow relative molecular mass distribution. After surface treatment of barium sulfate with mPEG-MMA, the barium sulfate can fully bind with the mPEG-MMA, and the hydrophilicity of the barium sulfate is significantly reduced. Furthermore, this significantly improves the overall performance of the corresponding filled polyolefin elastomer material, thereby enhancing the performance of barium sulfate-filled polyolefin elastomer materials in different application scenarios.

[0016] Secondly, the present invention provides a method for preparing a barium sulfate surface treatment aid, comprising:

[0017] (1) Heat the container and evacuate it, then fill it with inert gas and allow the container to cool to room temperature;

[0018] (2) Maintain an inert gas environment, add polyethylene glycol monomethyl ether into the container, add solvent, and shake to dissolve it;

[0019] (3) Add sodium hydride or potassium hydride into the container and carry out the reaction;

[0020] Preferably, sodium hydride is added to the container;

[0021] Preferably, the reaction is carried out at 20-30°C for 1-3 hours;

[0022] (4) Mix methyl methacrylate with a solvent to form a solution, and add the solution dropwise into a container to carry out the reaction;

[0023] Preferably, the temperature is maintained at 20-30°C and the reaction is continued for at least 2 hours, more preferably 2-4 hours; the minimum reaction time is 2 hours, and longer reaction time has no significant impact on the results.

[0024] (5) Add methanol dropwise into the container to terminate the reaction and collect the reaction product;

[0025] (6) Remove the solvent from the reaction product to obtain barium sulfate surface treatment aid mPEG-MMA.

[0026] In a further step, in step (1), the container is heated to 100-200°C.

[0027] In a further embodiment, the inert gas can be a commonly used inert gas, such as nitrogen.

[0028] As a more specific approach, in step (1), the prepared container is fully sealed and connected to a vacuum device via a conduit. While heating the container to 100-200°C, the container is evacuated to a vacuum. Then the vacuum is turned off, the conduit is connected to a nitrogen supply system, nitrogen is introduced into the container, and the container is cooled to room temperature. The above operations are repeated 3 times.

[0029] This step aims to thoroughly remove oxygen, carbon dioxide, and moisture from the reaction space to prevent these substances from damaging the ion initiator and causing the active center to become inactive.

[0030] In a further embodiment, in step (2), the weight of the solvent added is 2-4 times the weight of polyethylene glycol monomethyl ether;

[0031] Preferably, the solvent is selected from tetrahydrofuran.

[0032] In the oxyanionic polymerization described in this invention, a solvent environment with a certain polarity is required. At the same time, the corresponding synthetic raw materials and products also have requirements on the solubility parameters of the solvent. Therefore, this invention selects tetrahydrofuran as the solvent.

[0033] Preferably, the average molecular weight of the polyethylene glycol monomethyl ether is 200.

[0034] Among the conventional products of polyethylene glycol monomethyl ether, 200 is the lowest molecular weight. Due to the limitation that the molecular weight of the final product is between 300 and 600, it is not possible to choose polyethylene glycol monomethyl ether products with higher molecular weights.

[0035] As a more specific approach, in step (2), without disrupting the nitrogen environment inside the container, mPEG with an average molecular weight of 200 is added to the prepared container, and then 2-4 times the weight of tetrahydrofuran (THF) is added as a solvent. The mPEG is then fully dissolved by shaking.

[0036] As a solvent, THF has low viscosity and high solubility, providing good flowability. At the same time, THF has moderate polarity, avoiding the problems of initiator association and low initiation efficiency, making it an essential solvent for the oxyanionic polymerization of polar monomers.

[0037] In a further embodiment, in step (3), the molar ratio of sodium hydride or potassium hydride to polyethylene glycol monomethyl ether is 1:1.

[0038] Preferably, sodium hydride is used.

[0039] In this invention, sodium hydride is used as an initiator in the oxyanionic polymerization, acting as the component to initiate the reaction. The polymerization reaction begins with the reaction of sodium hydride with polyethylene glycol monomethyl ether to form active centers. Methyl methacrylate is then added in the presence of these active centers, allowing each active center to react simultaneously with methyl methacrylate. The molecular chains at each active center polymerize synchronously, forming the final product. During this process, it is necessary to control the ratio of initiator to polyethylene glycol monomethyl ether molecules to achieve a 1:1 ratio. By controlling the ratio of methyl methacrylate to initiator molecules, the molecular weight of the final product can be controlled.

[0040] The final product's molecular weight of 300-600 is designed based on the fact that this surface treatment aid will ultimately be used in barium sulfate treatment. Surface treatment aids with excessively high molecular weights have poor flowability and are solid in their normal state, making it difficult to achieve sufficient surface treatment of barium sulfate through simple stirring and heating processes. On the other hand, in surface treatment aids with excessively low molecular weights, since the mPEG component is fixed at a molecular weight of 200, the content of the MMA component is relatively small, resulting in a less than ideal surface treatment effect and function.

[0041] In a further embodiment, in step (4), the molar ratio of polyethylene glycol monomethyl ether to methyl methacrylate is 1:1-4;

[0042] Preferably, in step (4), the weight of the solvent in the solution is 2-4 times the weight of methyl methacrylate;

[0043] More preferably, the solvent is selected from tetrahydrofuran.

[0044] As a more specific approach, in step (4), sodium hydride of the same molar amount as mPEG is added to the container, that is, the weight of sodium hydride added is 12% of the weight of mPEG, and the reaction is carried out at 20-30°C for 1-3 hours.

[0045] Alternatively, add the same molar amount of potassium hydride as mPEG to the container, that is, add potassium hydride at 20% of the weight of mPEG, and react at 20-30°C for 1-3 hours.

[0046] The preferred option is to use sodium hydride.

[0047] Prepare a container with 1-4 times the molar weight of mPEG in MMA (i.e., MMA weight is 0.5-2 times the mPEG weight). Thoroughly mix this with 2-4 times the weight of THF in THF to form a solution. Add this solution dropwise to the container. Maintain the temperature at 20-30°C and continue the reaction for 2 hours. Then, add methanol dropwise to terminate the reaction and collect the reaction product.

[0048] This reaction is a typical oxoanionic polymerization, utilizing the oxoanions generated by sodium hydride in a polar solvent as active centers to initiate the polymerization of acrylate monomers. By combining this method, it is possible to synthesize structure-specific mPEG-MMA block copolymers with narrow molecular weight distributions at room temperature.

[0049] In a further step, in step (6), the collected product is subjected to vacuum distillation to remove THF, washed with ethanol, and then vacuum distilled again. Finally, the obtained product is centrifuged to remove the solvent, thus obtaining the barium sulfate surface treatment aid mPEG-MMA.

[0050] Based on the feeding ratio and the average molecular weight of mPEG, the average number of repeating units of mPEG in the mPEG-MMA segment synthesized in this invention is 4.5, the number of repeating units of MMA is 1-4, and the theoretical molecular weight of the overall product is between 300-600.

[0051] Thirdly, the present invention provides the application of the barium sulfate surface treatment aid as described above or the preparation method as described above in the preparation of surface-treated barium sulfate powder.

[0052] Fourthly, the present invention provides a method for preparing surface-treated barium sulfate powder, comprising:

[0053] Take barium sulfate powder and mix it with the barium sulfate surface treatment aid described in the first aspect or the barium sulfate surface treatment aid prepared by the preparation method described in the second aspect, and stir and mix at high speed.

[0054] Then, place it in a high-temperature environment of 90-110℃ for 3-5 hours to react; then stir at high speed to obtain surface-treated barium sulfate powder.

[0055] Preferably, the barium sulfate surface treatment additive is 0.5-15 wt% of the weight of the barium sulfate powder;

[0056] Preferably, the high-speed stirring speed is 1000-2000 rpm;

[0057] Preferably, the average particle size of the barium sulfate powder is 100-400 nm.

[0058] As a specific approach, methods for preparing surface-treated barium sulfate powder include:

[0059] (1) Mixing barium sulfate with surface additives:

[0060] Take barium sulfate powder with an average particle size of 100-400nm that has not undergone any surface chemical treatment, mix it with 0.5-15wt% of mPEG-MMA, and then put it into a high-speed mixer and mix it thoroughly for 3-6 minutes at a speed of 1000-2000rpm.

[0061] The mPEG-MMA designed in this invention has a molecular weight between 300 and 600, which is moderate and has a low overall viscosity. This allows for thorough mixing of mPEG-MMA and barium sulfate within a short mixing time, providing a foundation for subsequent modification reactions.

[0062] (2) Reaction combination:

[0063] Barium sulfate powder mixed with mPEG-MMA is placed in a high-temperature environment of 90-110℃ to allow the surface additives to react with the barium sulfate for 3-5 hours.

[0064] mPEG-MMA is a block copolymer of ethylene glycol and acrylate. The ester groups react with the hydroxyl groups on the surface of barium sulfate at high temperatures, promoting the full adhesion of mPEG-MMA to the barium sulfate surface and thus modifying it. Simultaneously, the polyether structure in the polyethylene glycol segments can also bind to the hydroxyl groups on the barium sulfate surface via hydrogen bonds. This achieves the coating of the surface treatment agent mPEG-MMA onto the barium sulfate surface, minimizing the exposed hydrophilic groups, improving the affinity between barium sulfate and the polymer component, and reducing its self-aggregation tendency. Because the polyether and polyester structures constitute a large proportion of mPEG-MMA, this surface treatment agent reacts fully with barium sulfate under sufficient heating conditions, making the reaction simple and easy to implement.

[0065] (3) Mixing and dispersing

[0066] The barium sulfate that has completed the surface reaction is placed back into a high-speed mixer and stirred thoroughly for 3-6 minutes at a speed of 1000-2000 rpm to finally obtain surface-treated barium sulfate powder.

[0067] Fifthly, the present invention provides a barium sulfate-filled polyolefin elastomer material, comprising:

[0068] The composition includes 0-90 wt% SBS, 0-95 wt% SEBS, 0-95 wt% POE, 0-45 wt% PP, 0-45 wt% PE, 5-50 wt% surface-treated barium sulfate powder prepared by the preparation method described in the fourth aspect, and 0.2-1 wt% antioxidant, wherein the sum of the amounts of SBS, SEBS and POE is 50-98 wt%.

[0069] Preferably, the antioxidant is selected from at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 626.

[0070] The polyolefin elastomer material of the present invention includes at least one polymer selected from butadiene-styrene copolymer (SBS), hydrogenated styrene-butadiene block copolymer (SEBS), and ethylene-α-olefin copolymer elastomer (POE), at least one polymer selected from polypropylene (PP) and polyethylene (PE), barium sulfate powder with surface treatment provided by the present invention, and an antioxidant.

[0071] Compared to similar materials prepared using ordinary barium sulfate, the filled polyolefin elastomer material prepared by using mPEG-MMA surface-treated barium sulfate in this invention has superior mechanical properties, higher resilience, and more ideal batch performance.

[0072] Sixthly, the present invention provides a method for preparing a barium sulfate-filled polyolefin elastomer material, comprising:

[0073] (1) Mix at least one of SBS, SEBS, and POE with at least one of PP and PE, surface-treated barium sulfate powder, and antioxidant;

[0074] This process involves adding all raw materials into a low-speed mixer and mixing them at 150 rpm for 2 minutes to obtain a well-blended mixture.

[0075] (2) Then, the material is melt-extruded by a twin-screw extruder, granulated, and barium sulfate-filled polyolefin elastomer material is obtained.

[0076] This process can utilize existing conventional twin-screw extruders and extrusion conditions. For example, the selected twin-screw extruder has an aspect ratio of 48–56:1, the vacuum extraction pressure in the metering section is set to -0.85–-0.95 MPa, the temperature of each section of the screw is set in the range of 130–230°C, and the main extruder speed is set to 200–400 rpm. The blended mixture is added to the twin-screw extruder through the main feed port for melt extrusion, and after pelleting, the corresponding barium sulfate-filled polyolefin elastomer material is obtained.

[0077] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0078] (1) This invention prepares an mPEG-MMA block copolymer with a relative molecular weight of 300-600 by controlling the amount of mPEG and MMA added through oxyanionic polymerization, and applies it to the surface treatment of barium sulfate. It fully utilizes the characteristics of low molecular weight and rich polyether and polyester structures, so that it can be quickly and uniformly mixed with barium sulfate, and the surface treatment of barium sulfate can be achieved under heating conditions. The reaction method is simple and easy to implement.

[0079] (2) The present invention utilizes the organic properties of mPEG-MMA to combine with the hydroxyl groups on the surface of barium sulfate and coat the surface of barium sulfate, thereby minimizing the exposed hydrophilic groups on the surface of barium sulfate and fully combining them on the surface of barium sulfate. This significantly overcomes the characteristic that barium sulfate is difficult to be compatible with polymers, so that the surface-treated barium sulfate can fully combine with the polyolefin elastomer components and achieve highly uniform dispersion.

[0080] (3) The use of surface-treated barium sulfate improves the overall performance of barium sulfate-filled polyolefin elastomer materials. Compared with similar materials prepared with ordinary barium sulfate, the filled polyolefin elastomer materials prepared by using mPEG-MMA-surface-treated barium sulfate of the present invention have superior mechanical properties, higher resilience, and more ideal batch performance.

[0081] (4) All kinds of equipment involved in this invention are commercially available equipment, and the raw materials are widely available. The overall solution is easy to implement.

[0082] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0083] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0084] Figure 1 This is a scanning electron microscope (SEM) image of the barium sulfate-filled polyolefin elastomer material prepared according to the preparation method described in Example 4.

[0085] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0086] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0087] The detection method used in this invention is as follows:

[0088] 1. Determination of average molecular weight:

[0089] The relative molecular weight of the samples was determined using liquid chromatography-mass spectrometry (LC-MS). Chromatographic grade methanol was used as the mobile phase, with an injection volume controlled at 5 μL. Sample ionization was performed using TIC anodic source ionization mode, combined with a multi-reaction-stage assay to determine the molecular weight.

[0090] 2. Thermogravimetric test:

[0091] Thermogravimetric analysis (TGA) was used to determine thermogravimetric loss. The sample was placed in a TGA crucible and the test was carried out under nitrogen atmosphere. The temperature range was 30°C to 800°C and the heating rate was 10°C / min.

[0092] 3. Water contact angle test:

[0093] Take a small amount of the powder to be tested, place it in a mold, and press it into a sheet under a pressure of 10 MPa. Using a contact angle tester, operate a micro syringe to drop water droplets onto the surface of the silicon dioxide sheet. Keep the first image after the water droplets have completely dripped. The angle between the tangent of the water droplet surface and the sample in the image is the contact angle.

[0094] 4. Tensile strength:

[0095] Tensile properties were tested according to GB / T 528-2009. Standard dumbbell-shaped specimens were cut using a cutting tool, with a thickness of 2±0.2 mm and a working area width of 6 mm. The specimen was fixed to the fixture of an electronic tensile testing machine, and the extensometer was clamped in the working area of ​​the specimen at a distance of 25 mm. Tensile strength was applied at a rate of 500 mm / min until the specimen broke. The tensile strength, stress at 300% elongation, and elongation at break were recorded.

[0096] 5. Tear strength:

[0097] Tear strength was tested according to GB / T 529-2008. Standard right-angled specimens with a thickness of 2±0.2 mm were cut using a standard cutter. The specimens were fixed to the fixture of an electronic tensile testing machine and subjected to a tear test at a rate of 500 mm / min until the specimens broke. The tear strength of the specimens was recorded.

[0098] Deformation recovery rate at 6.300% strain:

[0099] The sample was cut into a standard dumbbell shape according to GB / T 528-2009 standard, with a thickness of 2±0.2 mm and a working area width of 6 mm. After marking a 25 mm long area in the working area of ​​the sample, it was fixed to the fixture of the electronic tensile testing machine, and the extensometer was clamped onto the sample along the marked line. Tensioning was performed at a rate of 500 mm / min until the strain reached 300% (i.e., the total length within the marked area reached 100 mm), at which point the tensioning was stopped and the sample was removed. After 24 hours, the length L of the marked area was measured, and the deformation recovery rate was calculated according to R = (L-25) / (100-25)×100%.

[0100] Example 1: Preparation of Barium Sulfate Surface Treatment Auxiliary

[0101] Four 2000ml flasks were placed in four oil baths, with the oil bath temperature set to 120°C. The flasks were thoroughly sealed and connected to a vacuum pump via tubing. During heating, the vacuum pump was turned on, and all four flasks were gradually evacuated to a vacuum. After the flask temperature reached above 100°C, the vacuum was turned off after 2 minutes. Then, the flasks were connected to nitrogen cylinders one by one via tubing, and each flask was filled with nitrogen gas. All flasks were allowed to cool to room temperature. This process was repeated three times to prepare the four reaction vessels.

[0102] Using a syringe, add 50g of mPEG with an average molecular weight of 200 to the prepared flask. Then, using a syringe, add 100g of THF as a solvent. Shake repeatedly for 2 minutes to ensure the mPEG is fully dissolved. Repeat the same procedure for all four flasks. Inject 6g of sodium hydride into each of the four flasks and react in an oil bath at 20°C for 3 hours.

[0103] Prepare 25g, 50g, 75g, and 100g of MMA and place them in four beakers (numbered 1-4). Then, add 100g, 200g, 300g, and 400g of THF to the four beakers respectively, ensuring thorough mixing of the MMA and THF to form solutions. Add the MMA solutions from beakers 1-4 dropwise to four flasks, maintaining all flasks in an oil bath at 20°C for 2 hours. After the reaction time, add methanol dropwise to the four flasks to terminate the reaction. Open the flasks and collect the reaction products. Add the products sequentially to a rotary evaporator, remove THF by vacuum distillation, wash with ethanol, and then distill again under vacuum. Centrifuge the four products to remove the solvent, yielding barium sulfate surface additives mPEG-MMA with theoretical molecular weights of 300, 400, 500, and 600, respectively.

[0104] The four products were analyzed by mass spectrometry using liquid chromatography-mass spectrometry (LC-MS), and their average molecular weight and molecular structure were determined. The results are shown in Table 1. The results show that the main molecular composition of the obtained products is consistent with the design, and the measured average molecular weight is also basically consistent with the theoretical molecular weight.

[0105] Table 1

[0106]

[0107] Example 2

[0108] Place a 2000ml flask in an oil bath, set the oil bath temperature to 200℃, seal the flask thoroughly, and connect the flask to a vacuum pump via a tubing. During heating, turn on the vacuum pump and gradually evacuate the flask to a vacuum. After the flask temperature reaches above 190℃, turn off the vacuum after 2 minutes. Then connect the flask to a nitrogen cylinder via a tubing, fill the flask with nitrogen, and wait for the container to cool to room temperature. Repeat the above process 3 times to complete the preparation of the reaction vessel.

[0109] Using a syringe, add 100g of mPEG with an average molecular weight of 200 to the prepared flask. Then, using the syringe, add 400g of THF as a solvent and shake repeatedly for 2 minutes to fully dissolve the mPEG. Inject 20g of potassium hydride into the flask and react for 3 hours in an oil bath at 30°C.

[0110] Prepare 100g of MMA and place it in a beaker. Then add 200g of THF to the beaker, ensuring the MMA and THF are thoroughly mixed to form a solution. Add the MMA solution from the beaker dropwise into a flask, maintaining the flask in an oil bath at 30°C for 4 hours. After the reaction time is up, add methanol dropwise to the flask to terminate the reaction. Open the flask and collect the reaction product. Add the product to a rotary evaporator and remove the THF by vacuum distillation. Wash with ethanol and then distill again under vacuum. Centrifuge the obtained product to remove the solvent, yielding barium sulfate surface additive mPEG-MMA with a theoretical molecular weight of 400.

[0111] 1000g of untreated barium sulfate powder with an average particle size of 400nm was divided into 5 portions, numbered 1-5. 2g, 6g, 12g, 20g, and 30g of mPEG-MMA (theoretically molecular weight 400) were added to powders 1-5 respectively. After simple mixing, each of the five mixtures was placed in a high-speed mixer and thoroughly mixed at 1000rpm for 6 minutes. The five barium sulfate powders were then placed in a 110℃ oven and allowed to react for 3 hours. Afterward, each powder was placed back into a high-speed mixer and thoroughly mixed at 2000rpm for 3 minutes, resulting in five surface-treated barium sulfate powders with mPEG-MMA dosages of 1wt%, 3wt%, 6wt%, 10wt%, and 15wt% of the barium sulfate powder weight, respectively.

[0112] Five types of surface-treated barium sulfate powder and untreated barium sulfate powder were wrapped in filter paper and extracted using a Soxhlet extractor with cyclohexane as solvent for 24 hours (refluxed approximately every 15-20 minutes). The extracted products were then placed in an oven and dried at 70°C to constant weight, followed by thermogravimetric analysis (TGA). Based on the characteristics of barium sulfate powder, the weight loss range can be divided into two intervals: room temperature - 120°C and 120-800°C. The weight loss in the former interval is due to the removal of adsorbed water, while the weight loss in the latter interval is mainly caused by the removal of chemically bound water and the decomposition of surface additives bound to barium sulfate. The corresponding results are shown in Table 2.

[0113] Table 2

[0114]

[0115]

[0116] As shown in Table 2, with the increase of the relative amount of mPEG-MMA to barium sulfate, the weight loss of the corresponding barium sulfate samples increased in the 120-800℃ range, while the weight loss decreased in the room temperature-120℃ range. This result indicates, on the one hand, that mPEG-MMA and barium sulfate are fully and firmly bound, and on the other hand, that the hydrophilicity of barium sulfate bound with mPEG-MMA is significantly reduced.

[0117] Example 3

[0118] Place a 1000ml flask in an oil bath, set the oil bath temperature to 160℃, seal the flask thoroughly, and connect the flask to a vacuum pump via a tubing. During heating, turn on the vacuum pump and gradually evacuate the flask to a vacuum. After the flask temperature reaches above 150℃, turn off the vacuum after 2 minutes. Then connect the flask to a nitrogen cylinder via a tubing, fill the flask with nitrogen, and wait for the container to cool to room temperature. Repeat the above process 3 times to complete the preparation of the reaction vessel.

[0119] Using a syringe, add 40g of mPEG with an average molecular weight of 200 to the prepared flask. Then, using the syringe, add 120g of THF as a solvent and shake repeatedly for 2 minutes to fully dissolve the mPEG. Inject 4.8g of sodium hydride into the flask and react for 2 hours in an oil bath at 25°C.

[0120] Prepare 60g of MMA and place it in a beaker. Then add 180g of THF to the beaker, ensuring the MMA and THF are thoroughly mixed to form a solution. Add the MMA solution from the beaker dropwise into a flask, maintaining the flask in an oil bath at 25°C for 3 hours. After the reaction time is up, add methanol dropwise to the flask to terminate the reaction. Open the flask and collect the reaction product. Add the product to a rotary evaporator and remove the THF by vacuum distillation. Wash with ethanol and then distill again under vacuum. Centrifuge the obtained product to remove the solvent, yielding barium sulfate surface additive mPEG-MMA with a theoretical molecular weight of 500.

[0121] Take 200g of barium sulfate powder with an average particle size of 200nm that has not undergone any surface chemical treatment. Add 10g of mPEG-MMA (the theoretical molecular weight of which is 500) to the powder. After simple stirring and mixing, place the mixture in a high-speed mixer and mix thoroughly at 2000rpm for 3 minutes. Place the barium sulfate powder after high-speed stirring in a 90℃ oven and let it react for 5 hours. Then, remove it and place it in a high-speed mixer again and stir thoroughly at 1000rpm for 6 minutes to obtain surface-treated barium sulfate powder. The amount of the surface treatment agent mPEG-MMA is 5wt% of the weight of the barium sulfate powder.

[0122] A portion of the surface-treated barium sulfate powder was subjected to particle size analysis. Another portion of the treated barium sulfate powder was pressed into thin sheets at 15 MPa for water contact angle testing. Untreated barium sulfate powder was treated using the same method for control testing. The results are shown in Table 3.

[0123] Table 3

[0124]

[0125]

[0126] As shown in Table 3, the average particle size of barium sulfate remained basically unchanged after surface treatment, but the water contact angle was significantly increased. This indicates that surface treatment of barium sulfate with mPEG-MMA can significantly reduce the hydrophilicity of barium sulfate.

[0127] Example 4

[0128] Place a 2000ml flask in an oil bath, set the oil bath temperature to 130℃, seal the flask thoroughly, and connect the flask to a vacuum pump via a tubing. During heating, turn on the vacuum pump and gradually evacuate the flask to a vacuum. After the flask temperature reaches above 120℃, turn off the vacuum after 2 minutes. Then connect the flask to a nitrogen cylinder via a tubing, fill the flask with nitrogen, and allow the container to cool to room temperature. Repeat the above process 3 times to complete the preparation of the reaction vessel.

[0129] Using a syringe, add 200g of mPEG with an average molecular weight of 200 to the prepared flask. Then, using the syringe, add 500g of THF as a solvent and shake repeatedly for 2 minutes to fully dissolve the mPEG. Inject 24g of sodium hydride into the flask and react for 1.5 hours in an oil bath at 30°C.

[0130] Prepare 100g of MMA and place it in a beaker. Then add 300g of THF to the beaker, ensuring the MMA and THF are thoroughly mixed to form a solution. Add the MMA solution from the beaker dropwise into a flask and maintain the flask in an oil bath at 30°C for 3.5 hours. After the reaction time is reached, add methanol dropwise to the flask to terminate the reaction. After opening the flask, collect the reaction product and add it to a rotary evaporator. Remove the THF by vacuum distillation, wash with ethanol, and then distill again under vacuum. Centrifuge the obtained product to remove the solvent, yielding barium sulfate surface additive mPEG-MMA with a theoretical molecular weight of 300.

[0131] Take 2000g of barium sulfate powder with an average particle size of 100nm that has not undergone any surface chemical treatment. Add 160g of mPEG-MMA (the theoretical molecular weight of which is 300) to the powder. After simple stirring and mixing, place the mixture in a high-speed mixer and mix thoroughly at 1500rpm for 5 minutes. Place the barium sulfate powder after high-speed stirring in a 100℃ oven and let it react for 4 hours. Then remove it and place it in a high-speed mixer again and stir thoroughly at 1600rpm for 5 minutes to obtain surface-treated barium sulfate powder. The amount of the surface treatment agent mPEG-MMA is 8wt% of the weight of the barium sulfate powder.

[0132] According to the formulas shown in Table 4, based on a total of 2000g of material for each formula, weigh out the raw materials of the 6 components, add the 6 raw materials to the low-speed mixer in sequence, and mix at 150rpm for 2 minutes to obtain 6 well-mixed mixtures.

[0133] Table 4-1

[0134]

[0135]

[0136] Table 4-2

[0137]

[0138] A twin-screw extruder with a length-to-diameter ratio of 48:1 was selected. The screw was divided into 12 zones. The vacuum extraction pressure in the metering section was set to -0.90 MPa. The temperatures of each screw section were set to 130℃, 190℃, 200℃, 200℃, 210℃, 210℃, 200℃, 200℃, 205℃, 210℃, 210℃, and 220℃. The main extruder speed was set to 200 rpm. The mixed raw materials were added to the twin-screw extruder through the main feed port for melt blending. After pelleting, the corresponding barium sulfate-filled polyolefin elastomer material was obtained. The mechanical properties and deformation recovery of the obtained material were tested, and the results are shown in Table 5.

[0139] Table 5-1

[0140]

[0141] Table 5-2

[0142]

[0143]

[0144] Results Analysis: As can be seen from Table 5, compared with the use of untreated barium sulfate, the polyolefin elastomer materials with surface-treated barium sulfate have better mechanical properties and more ideal resilience. With the increase of barium sulfate filling amount, the performance advantage of the barium sulfate sample after surface treatment with mPEG-MMA is more obvious.

[0145] Example 5

[0146] Place a 5000ml flask in an oil bath, set the oil bath temperature to 180℃, seal the flask thoroughly, and connect the flask to a vacuum pump via a tubing. During heating, turn on the vacuum pump and gradually evacuate the flask to a vacuum. After the flask temperature reaches above 160℃, turn off the vacuum after 2 minutes. Then connect the flask to a nitrogen cylinder via a tubing, fill the flask with nitrogen, and wait for the container to cool to room temperature. Repeat the above process 3 times to complete the preparation of the reaction vessel.

[0147] Using a syringe, add 250g of mPEG with an average molecular weight of 200 to the prepared flask. Then, using the syringe, add 750g of THF as a solvent and shake repeatedly for 2 minutes to fully dissolve the mPEG. Inject 30g of sodium hydride into the flask and react for 2.5 hours in an oil bath at 25°C.

[0148] Prepare 375g of MMA and place it in a beaker. Then add 750g of THF to the beaker, ensuring the MMA and THF are thoroughly mixed to form a solution. Add the MMA solution from the beaker dropwise into a flask, maintaining the flask in an oil bath at 25°C for 2.5 hours. After the reaction time is up, add methanol dropwise to the flask to terminate the reaction. Open the flask and collect the reaction product. Add the product to a rotary evaporator, remove the THF by vacuum distillation, wash with ethanol, and then distill again under vacuum. Centrifuge the obtained product to remove the solvent, yielding barium sulfate surface additive mPEG-MMA with a theoretical molecular weight of 500.

[0149] 10,000 g of untreated barium sulfate powder with an average particle size of 300 nm was taken. 500 g of mPEG-MMA (the theoretical molecular weight of 500) was added to the powder. After simple mixing, the mixture was placed in a high-speed mixer and thoroughly mixed at 1800 rpm for 4 minutes. The barium sulfate powder was then placed in an oven at 105°C and allowed to react for 4 hours. Afterward, it was placed back into the high-speed mixer and thoroughly mixed at 1200 rpm for 6 minutes to obtain surface-treated barium sulfate powder. The amount of the surface treatment agent mPEG-MMA was 5 wt% of the weight of the barium sulfate powder.

[0150] According to the formulas shown in Table 6, based on a total of 2000g of material for each formula, weigh out the raw materials of the four components, add the four raw materials to the low-speed mixer in sequence, and mix at 150rpm for 2 minutes to obtain the four blended mixtures.

[0151] Table 6

[0152]

[0153] A twin-screw extruder with a length-to-diameter ratio of 52:1 was selected. The screw was divided into 13 zones. The vacuum extraction pressure in the metering section was set to -0.90 MPa. The temperatures of each screw section were set to 130℃, 190℃, 200℃, 200℃, 210℃, 210℃, 200℃, 200℃, 205℃, 205℃, 210℃, 210℃, and 220℃. The main extruder speed was set to 400 rpm. The mixed raw materials were added to the twin-screw extruder through the main feed port for melt blending. After pelleting, the corresponding barium sulfate-filled polyolefin elastomer material was obtained. The mechanical properties and deformation recovery of the obtained material were tested, and the results are shown in Table 7.

[0154] Table 7

[0155]

[0156] Example 6

[0157] Place a 1000ml flask in an oil bath, set the oil bath temperature to 170℃, seal the flask thoroughly, and connect the flask to a vacuum pump via a tubing. During heating, turn on the vacuum pump and gradually evacuate the flask to a vacuum. After the flask temperature reaches above 150℃, turn off the vacuum after 2 minutes. Then connect the flask to a nitrogen cylinder via a tubing, fill the flask with nitrogen, and wait for the container to cool to room temperature. Repeat the above process 3 times to complete the preparation of the reaction vessel.

[0158] Using a syringe, add 80g of mPEG with an average molecular weight of 200 to the prepared flask, then add 200g of THF as a solvent. Shake repeatedly for 2 minutes to ensure the mPEG is fully dissolved. Inject 9.6g of sodium hydride into the flask and react for 2.5 hours in an oil bath at 20°C.

[0159] Prepare 80g of MMA and place it in a beaker. Then add 160g of THF to the beaker, ensuring the MMA and THF are thoroughly mixed to form a solution. Add the MMA solution from the beaker dropwise into a flask, maintaining the flask in an oil bath at 20°C for 2 hours. After the reaction time is up, add methanol dropwise to the flask to terminate the reaction. Open the flask and collect the reaction product. Add the product to a rotary evaporator, remove the THF by vacuum distillation, wash with ethanol, and then distill again under vacuum. Centrifuge the obtained product to remove the solvent, yielding barium sulfate surface additive mPEG-MMA with a theoretical molecular weight of 400.

[0160] 1000g of untreated barium sulfate powder with an average particle size of 200nm was taken. 120g of mPEG-MMA (theoretically with a molecular weight of 400) was added to the powder. After simple stirring and mixing, the mixture was placed in a high-speed mixer and thoroughly mixed at 1400rpm for 5 minutes. The barium sulfate powder after high-speed mixing was placed in a 95℃ oven and allowed to react for 5 hours. Then, it was placed back into the high-speed mixer and thoroughly stirred at 1600rpm for 4 minutes to obtain surface-treated barium sulfate powder. The amount of the surface treatment agent mPEG-MMA was 12wt% of the weight of the barium sulfate powder.

[0161] According to the formula shown in Table 8, weigh 2000g of raw materials and add them sequentially into a low-speed mixer. Mix at 150rpm for 2 minutes to obtain a well-blended mixture.

[0162] Table 8

[0163]

[0164] A twin-screw extruder with a length-to-diameter ratio of 56:1 was selected. The screw was divided into 14 zones. The vacuum extraction pressure in the metering section was set to -0.90 MPa. The temperatures of each screw section were set to 130℃, 190℃, 200℃, 200℃, 210℃, 210℃, 200℃, 200℃, 205℃, 205℃, 210℃, 210℃, 210℃, and 220℃. The main extruder speed was set to 300 rpm. The mixed raw materials were added to the twin-screw extruder through the main feed port for melt blending. After pelleting, the corresponding barium sulfate-filled polyolefin elastomer material was obtained. After hot pressing, the material was observed under a scanning electron microscope, as shown in the attached figure. Figure 1 As shown, a large number of particles of hundreds of nanometers can be observed to be uniformly distributed on the material surface, which directly illustrates the role of mPEG-MMA in improving the dispersibility of barium sulfate in polyolefin elastomers.

[0165] Comparative Example 1

[0166] The difference between this comparative example and Example 2 is that the prepared MMA weight is 400g, and the THF used to mix the MMA in the beaker is 800g. The resulting solution was added to the mPEG solution in the same manner for reaction. Finally, a barium sulfate surface additive mPEG-MMA with a theoretical molecular weight of 1000 was obtained. When treating barium sulfate powder, this mPEG-MMA with a molecular weight of 1000 was used, and the surface-treated barium sulfate was numbered 6-10. The obtained surface-treated barium sulfate powder was also extracted and subjected to thermogravimetric analysis (TGA), and the results are shown in Table 9.

[0167] Table 9

[0168]

[0169] As shown in Table 9, barium sulfate treated with mPEG-MMA (molecular weight 400) exhibits more significant weight loss within the 120-800℃ range, under the same dosage. This indicates that the binding efficiency of mPEG-MMA with barium sulfate decreases as the molecular weight increases to 1000. This is partly because the number of mPEG-MMA molecules decreases with increasing molecular weight, and more importantly, surface treatment agents with excessively high molecular weights have poor flowability and are solid under normal conditions. It is difficult to achieve sufficient surface treatment of barium sulfate through simple stirring and heating, thus leading to a decrease in the binding efficiency of mPEG-MMA with barium sulfate.

[0170] Comparative Example 2

[0171] The difference between this comparative example and Example 4 is that, when treating the barium sulfate powder, mPEG-MMA was replaced with an equal mass of the surfactant potassium dodecyl alcohol ether phosphate to prepare surface-treated barium sulfate.

[0172] Then, according to the formulations in Table 4-2, replace the surface-treated barium sulfate in formulations 1-3 of surface-treated barium sulfate-filled polyolefin elastomers with the above-mentioned surface-treated barium sulfate of dodecyl alcohol ether phosphate potassium salt, and so on as formulations 9-11.

[0173] The other operations were exactly the same as in Example 4. The mechanical properties and deformation recovery of the obtained material were tested, and the results are shown in Table 10.

[0174] Table 10

[0175]

[0176] Results Analysis: As can be seen from Table 10, compared with untreated barium sulfate, the polyolefin elastomer material treated with potassium dodecyl alcohol ether phosphate salt has better mechanical properties and more ideal resilience, but its effect is not as good as mPEG-MMA.

[0177] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A barium sulfate surface treatment aid characterized in that, The invention comprises a block copolymer consisting of polyethylene glycol monomethyl ether and methyl methacrylate, wherein the molar ratio of polyethylene glycol monomethyl ether to methyl methacrylate is 1:1-4, and the theoretical molecular weight of the barium sulfate surface treatment additive is 300-600.

2. The barium sulfate surface treatment aid according to claim 1, characterized in that, In the block copolymer, the average number of repeating units of polyethylene glycol monomethyl ether is 4-5, and the number of repeating units of methyl methacrylate is 1-4.

3. A method for producing a barium sulfate surface treatment aid, characterized by, include: (1) Heat the container and evacuate it, then fill it with inert gas and allow the container to cool to room temperature; (2) Maintain an inert gas environment, add polyethylene glycol monomethyl ether into the container, then add solvent and shake to dissolve it; (3) Add sodium hydride or potassium hydride into the container and allow the reaction to proceed; (4) Mix methyl methacrylate with a solvent to form a solution, and add the solution dropwise into a container to carry out the reaction; (5) Add methanol dropwise into the container to terminate the reaction and collect the reaction product; (6) Remove the solvent from the reaction product to obtain barium sulfate surface treatment aid mPEG-MMA.

4. The preparation method according to claim 3, characterized in that, In step (1), the container is heated to 100-200℃.

5. The preparation method according to claim 3, characterized in that, In step (2), the weight of the added solvent is 2-4 times the weight of polyethylene glycol monomethyl ether.

6. The preparation method according to claim 3, characterized in that, In step (2), the solvent is selected from tetrahydrofuran.

7. The preparation method according to claim 3, characterized in that, In step (2), the average molecular weight of the polyethylene glycol monomethyl ether is 200.

8. The preparation method according to claim 3, characterized in that, In step (3), the reaction is carried out at 20-30℃ for 1-3 hours.

9. The preparation method according to claim 3, characterized in that, In step (3), the molar ratio of sodium hydride or potassium hydride to polyethylene glycol monomethyl ether is 1:

1.

10. The preparation method according to claim 3, characterized in that, In step (3), sodium hydride is used.

11. The preparation method according to any one of claims 3-10, characterized in that, In step (4), the molar ratio of polyethylene glycol monomethyl ether to methyl methacrylate is 1:1-4.

12. The preparation method according to any one of claims 3-10, characterized in that, In step (4), the weight of the solvent in the solution is 2-4 times the weight of methyl methacrylate.

13. The preparation method according to any one of claims 3-10, characterized in that, In step (4), the solvent is selected from tetrahydrofuran.

14. The preparation method according to any one of claims 3-10, characterized in that, In step (4), maintain a temperature of 20-30°C and continue the reaction for at least 2 hours.

15. The preparation method according to claim 14, characterized in that, In step (4), maintain a temperature of 20-30℃ and continue the reaction for 2-4 hours.

16. The use of a barium sulfate surface treatment aid as described in claim 1 or 2, or a barium sulfate surface treatment aid prepared by any one of the preparation methods described in claims 3-15, in the preparation of surface-treated barium sulfate powder.

17. A method for preparing surface-treated barium sulfate powder, characterized in that, include: Take barium sulfate powder and mix it with the barium sulfate surface treatment aid described in claim 1 or 2 or the barium sulfate surface treatment aid prepared by any one of the preparation methods described in claims 3-15, and stir the mixture at high speed. Then, place it in a high-temperature environment of 90-110℃ for 3-5 hours to react; then stir at high speed to obtain surface-treated barium sulfate powder.

18. The preparation method according to claim 17, characterized in that, The weight of the barium sulfate surface treatment additive is 0.5-15 wt% of the weight of the barium sulfate powder.

19. The preparation method according to claim 17, characterized in that, The high-speed stirring speed is 1000-2000 rpm.

20. The preparation method according to claim 17, characterized in that, The average particle size of the barium sulfate powder is 100-400 nm.

21. A barium sulfate-filled polyolefin elastomer material, characterized in that, include: SBS 0-90wt%, SEBS 0-95wt%, POE 0-95wt%, PP 0-45wt%, PE 0-45wt%, surface-treated barium sulfate powder prepared by the preparation method according to any one of claims 17-20 5-50wt%, antioxidant 0.2-1wt%, wherein the sum of the amounts of SBS, SEBS and POE is 50-98wt%.

22. The barium sulfate-filled polyolefin elastomer material according to claim 21, characterized in that, The antioxidant is selected from at least one of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 626.

23. A method for preparing a barium sulfate-filled polyolefin elastomer material as described in claim 21 or 22, characterized in that, include: Mix at least one of SBS, SEBS, and POE with at least one of PP and PE, surface-treated barium sulfate powder, and antioxidant; Then, it is melt-extruded through a twin-screw extruder, pelletized, and barium sulfate-filled polyolefin elastomer material is obtained.

24. The preparation method according to claim 23, characterized in that, The temperature of each section of the twin-screw extruder is set in the range of 130-230℃, and the main extruder speed is set in the range of 200-400rpm.

Images