Plastic filling lubricating master batch and preparation method thereof

Abstract

The embodiment of the invention discloses a plastic filling lubricating master batch and a preparation method thereof. The plastic filling lubricating master batch comprises a filling agent, a polypropylene material, a heat stabilizer, an antioxidant, a reaction accelerator, a modifier, an elastic material, a lubricant and a coupling agent, wherein the filling agent is calcium carbonate; the polypropylene material is polypropylene 7042; the heat stabilizer is compounded by zinc stearate and a beta-diketone auxiliary stabilizer; the antioxidant comprises a main antioxidant, an auxiliary antioxidant and a synergist; the reaction accelerant is a compound of stearic acid and citric acid; the modifier is PE wax and / or EBS; the elastic material is POE (Polyolefin Elastomer); the lubricant is prepared by compounding erucyl amide and modified polyethylene wax; the coupling agent is a titanate coupling agent.

Description

Technical Field

[0001] This specification relates to the field of biodegradable materials technology, and in particular to a plastic-filled lubricant masterbatch and its preparation method. Background Technology

[0002] In the plastics industry, surface lubrication plays a crucial role in the quality and application of plastics.

[0003] For example, lubrication of the injection molded part surface is crucial. To solve the problem of surface lubrication of injection molded parts, polishing or subsequent surface spraying is often used. However, this greatly reduces the product's color durability and surface cleaning ability, and the labor cost and material loss of the later processing are also significant.

[0004] Based on this, this application provides a plastic-filled lubricating masterbatch and its preparation method. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the embodiments in this specification are implemented as follows: This specification provides a plastic filler lubricant masterbatch and its preparation method to solve the following problems: Lubrication of the surface of injection molded parts is crucial. To solve the surface lubrication problem of injection molded parts, polishing or subsequent surface spraying is often used, which greatly reduces the color durability and surface cleaning ability of the product, and the labor cost and material loss of the subsequent processing are relatively large.

[0006] This specification provides an embodiment of a plastic-filled lubricant masterbatch, the components of which include: Fillers, polypropylene materials, heat stabilizers, antioxidants, reaction accelerators, modifiers, elastic materials, lubricants and coupling agents; in, The filler is calcium carbonate; The polypropylene material is polypropylene 7042; The heat stabilizer is a combination of zinc stearate and β-diketone auxiliary stabilizer; The antioxidant comprises a primary antioxidant, a secondary antioxidant, and a synergist. The reaction promoter is a combination of stearic acid and citric acid; The modifier is PE wax and / or EBS; The elastic material is POE; The lubricant is a compound of erucamide and modified polyethylene wax; The coupling agent is a titanate coupling agent.

[0007] Furthermore, the filler in the plastic-filled lubricating masterbatch further comprises: Silane coupling agent-grafted nano-silica; The amount of nano-silica grafted with the silane coupling agent is 3%.

[0008] Furthermore, the modifier further comprises: lignin sulfonate; The amount of lignin sulfonate added is 5%.

[0009] Furthermore, the ratio of zinc stearate to β-diketone auxiliary stabilizer is 1:0.2; The ratio of stearic acid to citric acid is 1:0.3; The ratio of erucamide to modified polyethylene wax is 0.5:1.

[0010] Furthermore, the synergist is used to enhance the antioxidant properties of the primary antioxidant; The synergist is EDTA; The primary antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; The auxiliary antioxidant is dilaurate thiodipropionate; The compounding ratio of the primary antioxidant, the auxiliary antioxidant, and the synergist is 1:0.025-0.05:4.

[0011] Furthermore, the filler comprises 100-130 parts; The polypropylene material has a composition of 90-120 parts; The heat stabilizer comprises 1-2 parts; The antioxidant component is 0.2-0.5 parts; The reaction promoter comprises 1-2 parts; The modifier comprises 1-2 parts; The elastic material comprises 5-10 parts; The lubricant has a composition of 0.3-0.8 parts; The coupling agent comprises 0.5-1 parts.

[0012] Furthermore, the filler comprises 120 parts; The polypropylene material has a composition of 100 parts; The heat stabilizer consists of 1 part; The antioxidant component is 0.2 parts; The reaction promoter is composed of 1 part; The modifier consists of 1 part; The elastic material has 8 parts in its composition; The lubricant has a composition of 0.5 parts; The coupling agent comprises 0.5 parts.

[0013] This illustrative embodiment also provides a method for preparing a plastic-filled lubricating masterbatch, the method comprising: The pretreated filler, polypropylene material, heat stabilizer, antioxidant, reaction promoter, modifier, elastic material, lubricant and coupling agent are mixed in a preset ratio and then added to a mixing equipment for low-temperature mixing to obtain the mixed product. The compounded product is fed into a screw extruder, where a dynamic temperature control strategy is employed to regulate the temperature and remove residual solvents through vacuum exhaust to obtain plastic-filled lubricating masterbatch.

[0014] Furthermore, the filler is calcium carbonate; The polypropylene material is polypropylene 7042; The heat stabilizer is a combination of zinc stearate and β-diketone auxiliary stabilizer; The antioxidant comprises a primary antioxidant, a secondary antioxidant, and a synergist. The reaction promoter is a combination of stearic acid and citric acid; The modifier is PE wax and / or EBS; The elastic material is POE; The lubricant is a compound of erucamide and modified polyethylene wax; The coupling agent is a titanate coupling agent; The pretreated filler is obtained by mixing the filler with ethanol; The temperature used for the low-temperature mixing is 80-120℃.

[0015] Furthermore, the dynamic temperature control strategy includes: a preset temperature of 100-120℃ for the feeding zone; a preset temperature of 160-180℃ for the melting zone; a preset temperature of 170-190℃ for the mixing zone; and a preset temperature of 165-175℃ for the discharging zone. If the absolute value of the difference between the temperature of the feeding zone and the preset temperature of the feeding zone is greater than or equal to 2℃, then the temperature of the feeding zone is adjusted to the range of the preset temperature of the feeding zone. The melting zone and the mixing zone are adjusted using an adaptive algorithm.

[0016] The above-mentioned technical solutions adopted in the embodiments of this specification can achieve the following effects: the plastic-filled lubricating masterbatch includes: a filler, a polypropylene material, a heat stabilizer, an antioxidant, a reaction promoter, a modifier, an elastic material, a lubricant, and a coupling agent; wherein, the filler is calcium carbonate; the polypropylene material is polypropylene 7042; the heat stabilizer is a compound of zinc stearate and β-diketone auxiliary stabilizer; the antioxidant includes a primary antioxidant, an auxiliary antioxidant, and a synergist; the reaction promoter is a compound of stearic acid and citric acid; the modifier is PE wax and / or EBS; the elastic material is POE; the lubricant is a compound of erucamide and modified polyethylene wax; and the coupling agent is a titanate coupling agent. This can obtain a plastic-filled lubricating masterbatch with better lubrication effect, reduce the production cost of the plastic-filled lubricating masterbatch, and obtain a plastic-filled lubricating masterbatch with more stable quality and better performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart illustrating a method for preparing a plastic-filled lubricating masterbatch, as provided in the embodiments of this specification. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0020] Unless otherwise specified, the experimental methods used in the embodiments of this specification are conventional methods. Unless otherwise specified, all experimental materials used are commercially available.

[0021] This specification provides an embodiment of a plastic-filled lubricating masterbatch, which includes: Fillers, polypropylene materials, heat stabilizers, antioxidants, reaction accelerators, modifiers, elastic materials, lubricants and coupling agents; in, The filler is calcium carbonate; The polypropylene material is polypropylene 7042; The heat stabilizer is a combination of zinc stearate and β-diketone auxiliary stabilizer; The antioxidant comprises a primary antioxidant, a secondary antioxidant, and a synergist. The reaction promoter is a combination of stearic acid and citric acid; The modifier is PE wax and / or EBS; The elastic material is POE; The lubricant is a compound of erucamide and modified polyethylene wax; The coupling agent is a titanate coupling agent.

[0022] The role of calcium carbonate filler is to provide mechanical properties, ensure the mechanical properties of plastic filler lubricant masterbatch, and meet the needs of actual use.

[0023] In the embodiments described in this specification, the filler in the plastic-filled lubricating masterbatch further comprises: Silane coupling agent-grafted nano-silica; The amount of nano-silica grafted with the silane coupling agent is 3%.

[0024] Considering the limited mechanical properties provided by the filler calcium carbonate, it is insufficient to meet the practical needs of certain applications requiring high mechanical properties. Therefore, it is necessary to enhance the mechanical properties of plastic filler lubricant masterbatches. Consequently, silane coupling agent-grafted nano-silica is further added to the filler. Silane coupling agent-grafted nano-silica can improve the mechanical strength of plastic filler lubricant masterbatches and enhance their heat resistance. Since silane coupling agent-grafted nano-silica can form a three-dimensional structure within the polypropylene matrix, it enhances impact resistance. The solution provided in this application can increase mechanical properties by more than 50% while maintaining tensile strength.

[0025] In this illustrative embodiment, the particle size of the silane coupling agent-grafted nano-silica is preferably 50 nm. The method for generating the silane coupling agent-grafted nano-silica adopts existing technology and will not be described in detail here.

[0026] Acrylic materials, as the matrix material for plastic filler lubricant masterbatches, endow them with the basic properties of plastics.

[0027] The main function of coupling agents is to enable the various components to be more firmly combined during the preparation of plastic filler lubricant masterbatch.

[0028] The main function of modifiers is to improve flowability. To further enhance the liquid flowability during the preparation of plastic filler lubricant masterbatches and obtain better masterbatches, lignin sulfonate is added to the modifier. This improves environmental friendliness and enhances the filler-resin interface bonding. The phenolic hydroxyl structure of lignin sulfonate helps stabilize the antioxidant system and extend product life. Adding lignin sulfonate to the modifier can increase the melt flow rate by 25%, making it suitable for high-speed extrusion and thin-wall injection molding, and reducing product defects such as bubbles or clouding.

[0029] In the embodiments described in this specification, the modifier further includes: lignin sulfonate; The amount of lignin sulfonate added is 5%.

[0030] In this embodiment, the heat stabilizer zinc stearate is combined with the β-diketone auxiliary stabilizer to enhance the stabilizer effect. The combination of the two can delay thermal degradation by capturing hydrogen chloride, widen the processing temperature window, and reduce coking.

[0031] The role of the accelerator is to promote the reaction. To further optimize the reaction effect, in the embodiments of this specification, the accelerator is a combination of stearic acid and citric acid. Citric acid, as a bio-based acid, can enhance the surface activation of calcium carbonate, and at the same time, it synergistically optimizes the internal and external lubrication balance with stearic acid, reducing processing torque fluctuations. This design improves filler dispersibility and gives the masterbatch degradable potential.

[0032] The function of a lubricant is to provide external lubrication. In the embodiments of this specification, the lubricant is erucamide and modified polyethylene wax. The polyethylene wax is grafted with maleic anhydride to form an interfacial compatibility layer with the POE elastomer, thus forming modified polyethylene wax, which significantly improves melt flowability and reduces the risk of precipitation. Erucamide provides highly efficient external lubrication, and erucamide and modified polyethylene wax synergistically improve the surface finish of the product.

[0033] In the embodiments of this specification, the ratio of zinc stearate to β-diketone auxiliary stabilizer is 1:0.2; The ratio of stearic acid to citric acid is 1:0.3; The ratio of erucamide to modified polyethylene wax is 0.5:1.

[0034] The main function of antioxidants is to enhance the antioxidant properties of plastic filler lubricant masterbatches, thereby extending the service life of the plastic.

[0035] In the embodiments described in this specification, the synergist is used to enhance the antioxidant properties of the primary antioxidant; The synergist is EDTA; The primary antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; The auxiliary antioxidant is dilaurate thiodipropionate; The compounding ratio of the primary antioxidant, the auxiliary antioxidant, and the synergist is 1:0.025-0.05:4.

[0036] Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], as the primary antioxidant, can inhibit oxidation chain reactions by scavenging free radicals and exhibits high thermal stability and strong migration resistance. Dilauryl thiodipropionate, as a secondary antioxidant, can break oxidation chains by decomposing peroxides. When used in combination with pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], a synergistic effect is produced, significantly improving overall antioxidant efficiency. This effectively prevents thermo-oxidative degradation of plastics during high-temperature processing and long-term use, extending product lifespan and reducing the risk of discoloration. The addition of the synergist EDTA (ethylenediaminetetraacetic acid) can significantly enhance the efficacy of the primary antioxidant and delay the oxidation process by chelating metal ions.

[0037] In the embodiments described in this specification, the filler component is 100-130 parts; The polypropylene material has a composition of 90-120 parts; The heat stabilizer comprises 1-2 parts; The antioxidant component is 0.2-0.5 parts; The reaction promoter comprises 1-2 parts; The modifier comprises 1-2 parts; The elastic material comprises 5-10 parts; The lubricant has a composition of 0.3-0.8 parts; The coupling agent comprises 0.5-1 parts.

[0038] To further verify the optimal proportions of the components in the plastic-filled lubricating masterbatch provided in the embodiments of this specification, the embodiments of this specification further verify these proportions using tensile strength and melt flow rate. Tensile strength is used to represent the mechanical properties of the plastic-filled lubricating masterbatch, while melt flow rate is used to indirectly reflect the lubrication performance of the plastic-filled lubricating masterbatch. Experimental results show that the optimal composition of the plastic-filled lubricating masterbatch is as follows: In the embodiments described in this specification, the filler comprises 120 parts; The polypropylene material has a composition of 100 parts; The heat stabilizer consists of 1 part; The antioxidant component is 0.2 parts; The reaction promoter is composed of 1 part; The modifier consists of 1 part; The elastic material has 8 parts in its composition; The lubricant has a composition of 0.5 parts; The coupling agent comprises 0.5 parts.

[0039] The plastic-filled lubricating masterbatch provided in the embodiments of this specification includes: a filler, a polypropylene material, a heat stabilizer, an antioxidant, a reaction promoter, a modifier, an elastic material, a lubricant, and a coupling agent; wherein, the filler is calcium carbonate; the polypropylene material is polypropylene 7042; the heat stabilizer is a compound of zinc stearate and β-diketone auxiliary stabilizer; the antioxidant comprises a primary antioxidant, an auxiliary antioxidant, and a synergist; the reaction promoter is a compound of stearic acid and citric acid; the modifier is PE wax and / or EBS; the elastic material is POE; the lubricant is a compound of erucamide and modified polyethylene wax; and the coupling agent is a titanate coupling agent. This method can obtain a plastic-filled lubricating masterbatch with better lubrication effect, reduce the production cost of the plastic-filled lubricating masterbatch, and obtain a plastic-filled lubricating masterbatch with more stable quality and better performance.

[0040] This specification provides a plastic-filled lubricating masterbatch, and correspondingly, this specification also provides a method for preparing the plastic-filled lubricating masterbatch.

[0041] Figure 1 This is a schematic flowchart illustrating a method for preparing a plastic-filled lubricating masterbatch, as provided in an embodiment of this specification. Figure 1 As shown, the preparation method includes: Step S101: The pretreated filler, polypropylene material, heat stabilizer, antioxidant, reaction promoter, modifier, elastic material, lubricant and coupling agent are mixed in a preset ratio and then added to a mixing equipment for low-temperature mixing to obtain the mixed product.

[0042] In the embodiments described in this specification, the filler is calcium carbonate; The polypropylene material is polypropylene 7042; The heat stabilizer is a combination of zinc stearate and β-diketone auxiliary stabilizer; The antioxidant comprises a primary antioxidant, a secondary antioxidant, and a synergist. The reaction promoter is a combination of stearic acid and citric acid; The modifier is PE wax and / or EBS; The elastic material is POE; The lubricant is a compound of erucamide and modified polyethylene wax; The coupling agent is a titanate coupling agent; The pretreated filler is obtained by mixing the filler with ethanol; The temperature used for the low-temperature mixing is 80-120℃.

[0043] When mixing filler with ethanol, it is important to ensure uniform wetting of the filler surface, and the water content of the filler should be controlled at 10%.

[0044] This low-temperature mixing method achieves efficient dispersion, reduces screw wear and energy consumption, and avoids material cross-linking caused by high temperatures, thus improving flowability. The solvent can be removed subsequently by vacuuming or drying.

[0045] In the embodiments described in this specification, the filler in the plastic-filled lubricating masterbatch further comprises: Silane coupling agent-grafted nano-silica; The amount of nano-silica grafted with the silane coupling agent is 3%.

[0046] In the embodiments described in this specification, the modifier further includes: lignin sulfonate; The amount of lignin sulfonate added is 5%.

[0047] In the embodiments of this specification, the ratio of zinc stearate to β-diketone auxiliary stabilizer is 1:0.2; The ratio of stearic acid to citric acid is 1:0.3; The ratio of erucamide to modified polyethylene wax is 0.5:1.

[0048] In the embodiments described in this specification, the synergist is used to enhance the antioxidant properties of the primary antioxidant; The synergist is EDTA; The primary antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; The auxiliary antioxidant is dilaurate thiodipropionate; The compounding ratio of the primary antioxidant, the auxiliary antioxidant, and the synergist is 1:0.025-0.05:4.

[0049] In the embodiments described in this specification, the filler component is 100-130 parts; The polypropylene material has a composition of 90-120 parts; The heat stabilizer comprises 1-2 parts; The antioxidant component is 0.2-0.5 parts; The reaction promoter comprises 1-2 parts; The modifier comprises 1-2 parts; The elastic material comprises 5-10 parts; The lubricant has a composition of 0.3-0.8 parts; The coupling agent comprises 0.5-1 parts.

[0050] In the embodiments described in this specification, the filler comprises 120 parts; The polypropylene material has a composition of 100 parts; The heat stabilizer consists of 1 part; The antioxidant component is 0.2 parts; The reaction promoter is composed of 1 part; The modifier consists of 1 part; The elastic material has 8 parts in its composition; The lubricant has a composition of 0.5 parts; The coupling agent comprises 0.5 parts.

[0051] Step S103: The compounded product is fed into a screw extruder, and a dynamic temperature control strategy is adopted to adjust the temperature and remove residual solvent by vacuum exhaust to obtain plastic filler lubricant masterbatch.

[0052] To obtain higher quality plastic-filled lubricating masterbatch, segmented control and dynamic temperature control strategies are employed in the embodiments of this specification.

[0053] In the embodiments of this specification, the dynamic temperature control strategy includes: a preset temperature of 100-120℃ for the feeding zone; a preset temperature of 160-180℃ for the melting zone; a preset temperature of 170-190℃ for the mixing zone; and a preset temperature of 165-175℃ for the discharging zone. If the absolute value of the difference between the temperature of the feeding zone and the preset temperature of the feeding zone is greater than or equal to 2℃, then the temperature of the feeding zone is adjusted to the range of the preset temperature of the feeding zone. The melting zone and the mixing zone are adjusted using an adaptive algorithm.

[0054] The purpose of temperature control in the feeding zone is to prevent material adhesion; the purpose of temperature control in the melting zone is to enhance shear dispersion; the purpose of temperature control in the mixing zone is to promote component fusion; and the purpose of temperature control in the discharge zone is to stabilize extrusion pressure.

[0055] In the embodiments of this specification, the adaptive algorithm collects the temperature during the mixing process of the plastic filler lubricating masterbatch and automatically adjusts the proportional (P), integral (I), and derivative (D) parameters based on the real-time deviation. For example, the proportional action is enhanced in the early stage of heating to speed up the response, and the integral action is strengthened to eliminate steady-state error when approaching the target. Since segmented control is used in this application, feedforward compensation control is further added on the basis of the adaptive algorithm to adjust the downstream parameters in advance according to the upstream temperature change and reduce lag. For example, the feeding zone is kept at a low temperature (e.g., 100-120°C) to prevent material adhesion, and the temperature in the mixing zone is increased (e.g., 160-180°C) to enhance shear dispersion.

[0056] Specifically, the proportional coefficient (P) is dynamically adjusted according to the temperature deviation: when the deviation is >5℃, the response is enhanced, and when it is <1℃, the oscillation is weakened; the integral time (I) is related to the material viscosity: when the viscosity is high, the integral time is extended to avoid overshoot; the derivative action (D) suppresses sudden heat changes, and the response time is ≤3 seconds.

[0057] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0058] The above description is merely an embodiment of this specification and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A plastic-filled lubricating masterbatch, characterized in that, The components of the plastic-filled lubricating masterbatch include: Fillers, polypropylene materials, heat stabilizers, antioxidants, reaction accelerators, modifiers, elastic materials, lubricants and coupling agents; in, The filler is calcium carbonate; The polypropylene material is polypropylene 7042; The heat stabilizer is a combination of zinc stearate and β-diketone auxiliary stabilizer; The antioxidant comprises a primary antioxidant, a secondary antioxidant, and a synergist. The reaction promoter is a combination of stearic acid and citric acid; The modifier is PE wax and / or EBS; The elastic material is POE; The lubricant is a compound of erucamide and modified polyethylene wax; The coupling agent is a titanate coupling agent.

2. The plastic filler lubricant masterbatch as described in claim 1, characterized in that, The filler in the plastic-filled lubricating masterbatch further includes: Silane coupling agent-grafted nano-silica; The amount of nano-silica grafted with the silane coupling agent is 3%.

3. The plastic filler lubricant masterbatch as described in claim 1, characterized in that, The modifier further includes: lignin sulfonate; The amount of lignin sulfonate added is 5%.

4. The plastic filler lubricant masterbatch as described in claim 1, characterized in that, The ratio of zinc stearate to β-diketone auxiliary stabilizer is 1:0.2; The ratio of stearic acid to citric acid is 1:0.3; The ratio of erucamide to modified polyethylene wax is 0.5:

1.

5. The plastic filler lubricant masterbatch as described in claim 1, characterized in that, The synergist is used to enhance the antioxidant properties of the primary antioxidant; The synergist is EDTA; The primary antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; The auxiliary antioxidant is dilaurate thiodipropionate; The compounding ratio of the primary antioxidant, the auxiliary antioxidant, and the synergist is 1:0.025-0.05:

4.

6. The plastic-filled lubricating masterbatch as described in claim 1, characterized in that, The filler has a composition of 100-130 parts; The polypropylene material has a composition of 90-120 parts; The heat stabilizer comprises 1-2 parts; The antioxidant component is 0.2-0.5 parts; The reaction promoter comprises 1-2 parts; The modifier comprises 1-2 parts; The elastic material comprises 5-10 parts; The lubricant has a composition of 0.3-0.8 parts; The coupling agent comprises 0.5-1 parts.

7. The plastic-filled lubricating masterbatch as described in claim 6, characterized in that, The filler has 120 parts components; The polypropylene material has a composition of 100 parts; The heat stabilizer consists of 1 part; The antioxidant component is 0.2 parts; The reaction promoter is composed of 1 part; The modifier consists of 1 part; The elastic material has 8 parts in its composition; The lubricant has a composition of 0.5 parts; The coupling agent comprises 0.5 parts.

8. A method for preparing a plastic-filled lubricating masterbatch, characterized in that, The preparation method includes: The pretreated filler, polypropylene material, heat stabilizer, antioxidant, reaction promoter, modifier, elastic material, lubricant and coupling agent are mixed in a preset ratio and then added to a mixing equipment for low-temperature mixing to obtain the mixed product. The compounded product is fed into a screw extruder, where a dynamic temperature control strategy is employed to regulate the temperature and remove residual solvents through vacuum exhaust to obtain plastic-filled lubricating masterbatch.

9. The preparation method according to claim 8, characterized in that, The filler is calcium carbonate; The polypropylene material is polypropylene 7042; The heat stabilizer is a combination of zinc stearate and β-diketone auxiliary stabilizer; The antioxidant comprises a primary antioxidant, a secondary antioxidant, and a synergist. The reaction promoter is a combination of stearic acid and citric acid; The modifier is PE wax and / or EBS; The elastic material is POE; The lubricant is a compound of erucamide and modified polyethylene wax; The coupling agent is a titanate coupling agent; The pretreated filler is obtained by mixing the filler with ethanol; The temperature used for the low-temperature mixing is 80-120℃.

10. The preparation method according to claim 8, characterized in that, The dynamic temperature control strategy includes: a preset temperature of 100-120℃ for the feeding zone; a preset temperature of 160-180℃ for the melting zone; a preset temperature of 170-190℃ for the mixing zone; and a preset temperature of 165-175℃ for the discharging zone. If the absolute value of the difference between the temperature of the feeding zone and the preset temperature of the feeding zone is greater than or equal to 2℃, then the temperature of the feeding zone is adjusted to the range of the preset temperature of the feeding zone. The melting zone and the mixing zone are adjusted using an adaptive algorithm.

Images