Novel high-temperature-resistant plastic centrifugal pump material as well as preparation method and application thereof

Abstract

The invention relates to the field of new energy equipment materials, and discloses a high-temperature-resistant plastic centrifugal pump new material and a preparation method and application thereof. An inorganic filler; the phase change material is encapsulated by the microcapsule; a synergistic stabilizer; the inorganic filler comprises but is not limited to glass fibers and carbon fibers; the mass percent of the glass fibers in the inorganic filler is 15%-25%, the mass percent of the carbon fibers in the inorganic filler is 10%-15%, and the average length of the glass fibers is 0.1 mm-0. 3 mm. By adopting the technical scheme of collaborative optimization of the polyether-ether-ketone matrix and the inorganic filler and reasonably proportioning the glass fibers and the carbon fibers, the heat resistance of the composite material is improved, particularly, the highest continuous working temperature of a centrifugal pump core component is increased, the problem that the mechanical property of the centrifugal pump core component is sharply reduced in a high-temperature environment is solved, and the service life of the centrifugal pump core component is prolonged. And the application field of the plastic centrifugal pump under high-temperature working conditions such as nuclear power and chemical engineering is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy equipment materials, and in particular to a new high-temperature resistant plastic centrifugal pump material, a preparation method thereof, and applications thereof. Background Art

[0002] As an important equipment for fluid transportation, centrifugal pumps have been widely used in chemical, energy, pharmaceutical, and nuclear power industries. In recent years, with the rapid development of nuclear power and new energy technologies, centrifugal pumps have gradually taken on more demanding tasks, such as the circulation and transportation of coolants in nuclear power plants and the precise transmission of new energy electrolytes. These application scenarios place higher performance requirements on centrifugal pumps, especially in high temperature, high pressure, high corrosion and long-term operation environments, requiring the pump body material to have better temperature resistance, mechanical strength and thermal stability. To this end, existing technologies generally use engineering plastics or high-performance polymers such as polypropylene, polyamide, polyetheretherketone, etc. These solutions have shown good applicability in medium and low temperature conditions and have achieved certain industrial applications.

[0003] However, in actual applications, these traditional technical solutions have exposed some problems under high-temperature conditions, which has limited their further development. First, in terms of the high-temperature resistance of core components, the maximum continuous operating temperature of existing materials is difficult to break through the range of 120°C to 150°C, which makes it difficult for plastic centrifugal pumps to adapt to the long-term requirements of higher temperature working conditions such as nuclear power cooling systems; secondly, in terms of the mechanical strength and dimensional stability of the material, due to insufficient fiber dispersion and poor interface bonding, the filling and reinforcement materials are prone to local stress concentration in actual operation, resulting in component deformation and performance degradation; in addition, the existing technology for regulating temperature changes inside the pump body relies on passive heat dissipation, which makes it difficult to solve the problem of local heat accumulation during operation, resulting in insufficient long-term stability of the equipment. The existence of these problems shows that traditional plastic centrifugal pump material technology still needs to be further optimized to achieve wider applicability and higher reliability. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a new high-temperature resistant plastic centrifugal pump material and its preparation method and application, which solves the problems of insufficient temperature resistance, poor dimensional stability and lack of active thermal management capabilities of existing centrifugal pump materials under high-temperature conditions.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A new high-temperature resistant plastic centrifugal pump material, including the following component materials: Polyetheretherketone: 60%~70%; Inorganic fillers: 25% to 35%; Microencapsulated phase change materials: 2% to 5%; Synergistic stabilizer: 2% to 3%; The inorganic filler includes but is not limited to glass fiber and carbon fiber; Furthermore, polyetheretherketone (60%-70%): As a matrix material, polyetheretherketone exhibits excellent mechanical strength and fatigue resistance in high temperatures and harsh chemical environments due to its excellent thermal stability and chemical tolerance. Polyetheretherketone has a high glass transition temperature (143°C) and melting point (343°C), providing fundamental support for the material's overall high-temperature resistance.

[0006] Inorganic fillers (25%-35%): Inorganic fillers such as glass fiber and carbon fiber enhance the overall performance of the matrix material by strengthening its mechanical properties (such as rigidity and wear resistance) and dimensional stability. Glass fiber primarily contributes to increased tensile strength and impact toughness, while carbon fiber, with its low thermal expansion coefficient and high thermal conductivity, significantly reduces the overall thermal expansion coefficient of the material while improving thermal conductivity.

[0007] Microencapsulated phase change materials (2%-5%): The addition of phase change materials effectively delays thermal aging caused by localized overheating by absorbing heat and achieving temperature equilibrium under high-temperature conditions. Microencapsulation technology uses a polymer film to encapsulate a phase change core material such as paraffin or fatty acids, preventing leakage and providing excellent dispersibility and thermal cycling stability.

[0008] Synergistic stabilizer (2% to 3%): Synergistic stabilizers (such as zinc acetylacetonate and silane coupling agents) improve the interfacial bonding between the matrix material and the inorganic filler, thereby enhancing the thermal stability of the material, while also playing an antioxidant and anti-aging role.

[0009] Preferably, the mass percentage of glass fiber in the inorganic filler is 15% to 25%, the mass percentage of carbon fiber is 10% to 15%, and the average length of the glass fiber is 0.1 mm to 0.3 mm; Furthermore, the synergistic reinforcement of glass and carbon fibers improves the mechanical strength of the composite while significantly reducing its coefficient of thermal expansion. This allows the material to maintain dimensional stability in high-temperature environments, meeting the high-precision requirements of centrifugal pump components. Optimizing the length of the glass fibers avoids uneven dispersion during processing, improving the overall performance of the composite.

[0010] Preferably, the microcapsule encapsulated phase change material comprises paraffin or fatty acid as the core phase change material, and the outer layer is coated with a polymer film, and the particle size of the microcapsule encapsulated phase change material ranges from 5 μm to 30 μm; Furthermore, the microencapsulated phase change material absorbs environmental or frictional heat and balances internal temperature fluctuations during the operation of centrifugal pump components through thermal management functions, thereby preventing material deformation or degradation caused by local overheating and significantly improving the thermal cycling stability and long-term reliability of the composite material.

[0011] Preferably, the synergistic stabilizer is zinc acetylacetonate, a silane coupling agent or a mixture thereof, wherein the mass percentage of zinc acetylacetonate is 1% to 2%, and the mass percentage of the silane coupling agent is 0.5% to 1%.

[0012] A method for preparing a new material for a high-temperature resistant plastic centrifugal pump comprises the following steps: S1, uniformly mixing polyetheretherketone powder, inorganic filler, microencapsulated phase change material and synergistic stabilizer; S2. heating the mixture at a temperature of 330° C. to 340° C. until it is molten, thereby forming a molten composite material; S3. Using a molding process, the molten composite material is cooled and solidified into centrifugal pump components.

[0013] Preferably, in step S1, the microcapsulated phase change material is uniformly dispersed in the mixture.

[0014] Preferably, in step S3, the molding process includes an injection molding process and an extrusion molding process.

[0015] Preferably, in step S3, the molding pressure of the injection molding is 110 MPa to 130 MPa, and the mold temperature is 150° C. to 160° C.; Furthermore, the preparation method includes uniformly mixing the components, melting them at 330°C to 340°C, and preparing centrifugal pump components through a molding process, wherein the uniform dispersion of the microencapsulated phase change material is emphasized.

[0016] Importance of mixing uniformity: Microencapsulated phase change materials have small particle sizes (5μm to 30μm) and are prone to agglomeration within the matrix. High-shear mixing ensures uniform dispersion of the microencapsulated material, avoiding localized agglomeration that can lead to reduced thermal management and uneven mechanical properties.

[0017] High-temperature melting and homogeneous molding: The polyetheretherketone matrix must be melted at a high temperature of 330°C to 340°C to achieve uniform compounding. In the molten state, the glass fiber, carbon fiber, and microcapsule materials can be fully dispersed and form a tight bond with the matrix, giving the material excellent mechanical properties and thermal management capabilities.

[0018] Preferably, in step S3, the thermal expansion coefficient of the composite material is controlled within the range of 0.3% to 0.5% under a constant temperature of 150°C; Furthermore, during the molding process, the thermal expansion coefficient of the material is controlled within the range of 0.3% to 0.5% by controlling the mold temperature (150°C to 160°C) and optimizing the design of the composite material.

[0019] The core of thermal expansion coefficient optimization: the low thermal expansion of carbon fiber and the uniform dispersion of short glass fiber, combined with a synergistic stabilizer to improve interfacial bonding, effectively suppress the dimensional changes of the composite material under high temperature conditions. Simultaneously, mold temperature control technology slows the cooling rate to avoid concentrated internal stress, ensuring better dimensional accuracy under high-temperature conditions.

[0020] A new material for a high-temperature resistant plastic centrifugal pump is used to manufacture core components of a high-temperature resistant centrifugal pump, which is used in high-temperature working environments of nuclear power coolant circulation pumps, new energy fuel pumps, and chemical medium conveying systems.

[0021] The present invention provides a new high-temperature resistant plastic centrifugal pump material, its preparation method, and application. It has the following beneficial effects: 1. The present invention adopts a technical solution of synergistic optimization of the polyetheretherketone matrix and inorganic fillers, and improves the heat resistance of the composite material by rationally proportioning glass fiber and carbon fiber. In particular, it increases the maximum continuous operating temperature of the core components of the centrifugal pump. Compared with the upper temperature resistance limit of existing ordinary engineering plastics, this improvement solves the problem of a sharp decline in mechanical properties under high-temperature environments, greatly broadening the application areas of plastic centrifugal pumps under high-temperature conditions such as nuclear power and chemical industry.

[0022] 2. The present invention improves the mechanical strength of the material and ensures structural integrity under high temperature and high pressure conditions through the optimized combination and microstructure control of inorganic reinforcing fibers. At the same time, combined with the strengthening effect of the synergistic stabilizer on the interface between the fiber and the matrix, the thermal expansion control performance of the composite material is greatly improved. Compared with traditional fiber-free reinforced plastic products, the material of the present invention significantly reduces the thermal expansion coefficient, solving the shortcomings of the prior art of gap changes and failures caused by thermal expansion of components, thereby effectively extending the service life of the centrifugal pump and significantly reducing the frequency of equipment maintenance.

[0023] 3. The present invention incorporates active thermal management functions into the material by introducing microcapsule-encapsulated phase change materials and combining them with dispersion technology. The phase change materials absorb and store excess heat in high-temperature environments, preventing local overheating and improving the safety and overall performance of the pump body. Compared with existing technical solutions that simply rely on passive heat dissipation, the present invention effectively solves the problem of local heat accumulation in the pump body under high-temperature conditions, ensuring long-term stable operation of the equipment, and showing higher safety and reliability, especially under high-temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of the process steps of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Please see the attached Figure 1 Example 1: Preparation of impeller components under high temperature conditions Raw materials preparation: Weigh 65g of polyetheretherketone powder, 20g of glass fiber (average length 0.2mm), 12g of carbon fiber, 3g of microencapsulated phase change material (paraffin wax as the core material, particle size 10μm), 1.5g of zinc acetylacetonate, and 1g of silane coupling agent. Dry the raw materials to ensure a moisture content of less than 0.02%.

[0027] Mixing and pretreatment: PEEK powder, glass fiber, and carbon fiber were placed in a mixer and stirred at low speed for 3 minutes. Microencapsulated phase change material was then added and mixed for another 2 minutes. Finally, zinc acetylacetonate and silane coupling agent were added and stirred until the mixture was uniform.

[0028] Melt compounding: The mixture was fed into a twin-screw extruder with the temperature zones set at 325°C, 335°C, and 340°C, the screw speed at 120 rpm, and the melting time controlled at 5 minutes. After extrusion, the mixture was cooled and pelletized for later use.

[0029] Molding process: The pellets were placed in an injection molding machine with the mold temperature set at 155°C and the molding pressure at 125 MPa. The cooling time was controlled within 6 minutes to obtain the impeller component.

[0030] Test results: Test results show that the material exhibited no noticeable deformation after 1,000 hours of continuous operation at 150°C, with a thermal expansion coefficient of 0.35%. Compared to traditional materials, this material solves the problem of component deformation and failure at high temperatures, while significantly improving its applicability in high-temperature operating conditions.

[0031] Example 2: Preparation of pump casing material with active thermal management function Recipe design: Weigh 70g of polyetheretherketone, 18g of glass fiber (0.1mm length), 10g of carbon fiber, 2g of microencapsulated phase change material (with a fatty acid core and a particle size of 20μm), and 1.8g of zinc acetylacetonate. Dry the materials at 60°C for 6 hours.

[0032] Mixed processing: Add the polyetheretherketone powder, glass fiber, and carbon fiber to the mixer in the correct proportions. Mix for 3 minutes, then gradually add the microencapsulated phase change material and zinc acetylacetonate. Mix at 1000 rpm for 5 minutes to ensure that all components are evenly dispersed.

[0033] Melt compounding and pelletizing: The mixed material was fed into a single-screw extruder with a melt temperature set at 330°C to 340°C and a screw speed of 100 rpm. The extrudate was cooled and pelletized for subsequent molding.

[0034] Molding and cooling: The pump housing components were molded using an injection molding process with a mold temperature of 160°C and a molding pressure of 130 MPa. The finished product was obtained after cooling.

[0035] Application effect verification: During operation, the microencapsulated phase-change material in the pump casing absorbs heat to achieve dynamic internal temperature equilibrium, keeping the pump temperature rise within 10°C. This solves the problem of traditional materials' inability to actively regulate heat accumulation and significantly improves the stability and safety of the equipment.

[0036] Example 3: Preparation of high mechanical strength wear-resistant sleeve material Raw material preparation: Weigh 66g of polyetheretherketone, 19g of glass fiber (average length 0.25mm), 12g of carbon fiber, 3g of microencapsulated phase change material (a mixture of paraffin wax and fatty acid as the core, particle size 15μm), and 1g of silane coupling agent. Dry all ingredients until no visible moisture is present.

[0037] Mixing and homogenization: First, polyetheretherketone is mixed with glass fiber and carbon fiber at low speed for 3 minutes, and then microcapsule material and silane coupling agent are added and switched to high-speed mixing for 5 minutes to ensure that the inorganic filler is fully combined with the matrix and evenly dispersed.

[0038] Melt processing: The mixed material was placed into a twin-screw extruder with a melting temperature range of 330°C to 340°C and a screw speed of 110 rpm. After melting, the mixture was cooled and pelletized for later use.

[0039] Compression Molding: The pellets were put into a molding machine with a mold temperature of 155° C. and a pressure of 120 MPa, and cooled to room temperature to obtain a shaft sleeve component.

[0040] Performance evaluation: Test results show that the wear resistance of the sleeve components is significantly improved under high temperature and high pressure conditions, with surface wear reduced to just 0.05mm. At the same time, the material's tensile strength is increased by 25%, overcoming the lifespan shortening caused by wear in traditional materials and extending the lifespan of the equipment.

[0041] Comparative Example 1 (corresponding to Example 1): Changing the ratio of inorganic fillers and the length of glass fibers Raw materials preparation: The material used was 65g of polyetheretherketone, 25g of glass fiber (average length 0.4mm), 8g of carbon fiber, 2g of microencapsulated phase change material (paraffin as the core, particle size 10μm), 1g of zinc acetylacetonate, and 1g of silane coupling agent. All the raw materials were dried.

[0042] Mixed processing: The polyetheretherketone powder was first mixed with glass fiber and carbon fiber at a low speed for 2 minutes, and then the microcapsulated phase change material and other auxiliary agents were added and the mixing was continued for 4 minutes.

[0043] Melt compounding: The mixture was transferred to a twin-screw extruder with the temperature zones set at 325°C, 335°C, and 340°C and a screw speed of 110 rpm. After extrusion, the mixture was cooled and pelletized for later use.

[0044] Molding process: The pellets were molded by injection molding with a mold temperature of 150°C, an injection pressure of 120 MPa, and a cooling time of 5 min.

[0045] Comparative Example 2 (corresponding to Example 2): Phase change material is not encapsulated using microcapsules Raw materials preparation: Weigh 70 g of polyetheretherketone, 20 g of glass fiber (average length 0.2 mm), 10 g of carbon fiber, 1.5 g of zinc acetylacetonate, and 1 g of silane coupling agent. No microencapsulated phase change material was added.

[0046] Mixing process: The polyetheretherketone powder was mixed with glass fiber and carbon fiber in proportion for 3 minutes, and then zinc acetylacetonate and silane coupling agent were added and mixed for another 4 minutes to ensure uniform dispersion.

[0047] Melt processing: The mixture was placed into a single-screw extruder, the melting temperature zones were set to 330°C, 335°C, and 340°C, the screw speed was 100 rpm, and after melt compounding, the mixture was cooled and pelletized.

[0048] Molding operation: The pellets were made into pump casing components through injection molding process. The mold temperature was controlled at 155°C and the molding pressure was 125 MPa. The components were demoulded after cooling to room temperature.

[0049] Comparative Example 3 (corresponding to Example 3): No synergistic stabilizer was used Raw material preparation: Weigh 66g of polyetheretherketone, 19g of glass fiber (0.25mm in length), 12g of carbon fiber, and 3g of microencapsulated phase change material (core: a paraffin wax and fatty acid mixture, particle size 15μm). No zinc acetylacetonate or silane coupling agent was added.

[0050] Mixed processing: First, polyetheretherketone was mixed with glass fiber and carbon fiber at low speed for 3 minutes, and then microcapsule encapsulated phase change material was added and mixed at high speed for 5 minutes to ensure uniform dispersion.

[0051] Melt compounding: The mixed material was fed into a twin-screw extruder with the temperature zones set at 330°C, 335°C, and 340°C, and the screw speed at 110 rpm. After extrusion, the mixture was cooled and pelletized for later use.

[0052] Compression Molding: The pellets were put into a molding machine, the mold temperature was set to 155°C and the pressure was 120 MPa, and the mold was demoulded after cooling to room temperature to obtain a shaft sleeve component.

[0053] Comparative Example 4 (corresponding to Example 1): Changing the melting temperature and molding pressure Raw materials preparation: The raw material ratio and processing steps are exactly the same as those in Example 1.

[0054] Mixing and melting: The mixing process was the same as that in Example 1. During melt compounding, the temperature zones of the twin-screw extruder were adjusted to 320° C., 325° C., and 330° C., and the screw speed was still 120 rpm.

[0055] Molding operation: During the injection molding process, the molding pressure was adjusted to 100 MPa, the mold temperature was 145 °C, and the cooling time was set to 6 min.

[0056] Comparative Example 5 (corresponding to Example 2): Adjustment of the ratio of glass fiber to carbon fiber Raw materials preparation: It uses 70g of polyetheretherketone, 10g of glass fiber (length 0.2mm), 20g of carbon fiber, 2g of microcapsule encapsulated phase change material, and 1.8g of zinc acetylacetonate.

[0057] Mixing and processing: Polyetheretherketone was mixed with glass fiber and carbon fiber in proportion, and mixed at a low speed for 3 minutes. Then, microcapsule-encapsulated phase change material and zinc acetylacetonate were added, and the mixture was mixed at a high speed for 4 minutes.

[0058] Melt compounding: The melting temperature range of the twin-screw extruder was set to 330°C, 335°C, and 340°C, the screw speed was 100 rpm, and the pellets were cut into pellets after cooling for later use.

[0059] Injection molding: The pump housing components were prepared by injection molding with a mold temperature of 155°C, a molding pressure of 130 MPa, and a cooling time of 6 min.

[0060] Comparative Example 6 (corresponding to Example 3): Phase change material without microencapsulation treatment Raw materials preparation: The material used was 66g of polyetheretherketone, 19g of glass fiber (0.25mm in length), 12g of carbon fiber, and 3g of directly added paraffin wax (not microencapsulated). 1.8g of zinc acetylacetonate and 1g of silane coupling agent were also used.

[0061] Mixing and processing: Mix polyetheretherketone with glass fiber and carbon fiber for 3 minutes, add uncoated paraffin and stabilizer, mix at low speed for 2 minutes, and then mix at high speed for 4 minutes.

[0062] Melt processing: Place the mixture in a single-screw extruder at a melting temperature of 330°C to 340°C and a screw speed of 110 rpm. Cool and pelletize for later use.

[0063] Compression Molding: The shaft sleeve components were prepared by a molding process with a mold temperature of 155°C and a pressure of 120 MPa, and demoulding was performed after cooling to room temperature.

[0064] Test experiment: Experiment 1: High temperature applicability test of materials Experimental description: Experimental objectives: The dimensional stability and long-term working ability of the material of the present invention at a high temperature of 150° C. were verified, with a focus on comparing the performance differences between Example 1 and Comparative Example 1.

[0065] Experimental steps: Sample preparation: Impeller components prepared from Example 1 and Comparative Example 1 were used, with three samples per set. The Example 1 samples employed an optimized ratio of 20% glass fiber (average length 0.2 mm) to 12% carbon fiber. In the Comparative Example 1 samples, the glass fiber ratio was increased to 25%, the length to 0.4 mm, and the carbon fiber ratio was reduced to 8%.

[0066] High temperature environment settings: All samples were placed in a thermostat set at 150°C and maintained at that temperature. To simulate actual working conditions, each sample was loaded with a constant mechanical load (5 MPa) using vertical pressure.

[0067] Dimensional change monitoring: The diameter and thickness of key parts of the sample were measured using a high-precision micrometer (with an accuracy of 0.01 mm). The dimensional changes were recorded every 200 hours. The total test duration was 1000 hours.

[0068] Performance Check: After the test, observe the sample surface and record whether there is obvious cracking, warping or other mechanical failure.

[0069] Experimental data: Test time (hours) Example 1 Sample 1 Example 1 Sample 2 Example 1 Sample 3 Comparative Example 1 Sample 1 Comparative Example 1 Sample 2 Comparative Example 1 Sample 3 0 0.00 0.00 0.00 0.00 0.00 0.00 200 0.02 0.03 0.02 0.08 0.10 0.09 400 0.05 0.06 0.05 0.18 0.15 0.17 600 0.08 0.09 0.08 0.26 0.30 0.29 800 0.10 0.12 0.11 0.39 0.37 0.41 1000 0.12 0.13 0.11 0.46 0.44 0.48 Surface state No significant changes No significant changes No significant changes Cracking and slight warping Obvious surface cracks Cracking and severe warping Experimental summary: The optimized material system exhibits remarkable dimensional stability. At a high temperature of 150°C, the diameter change of the sample in Example 1 is much lower than that in Comparative Example 1. Combined with the mechanism analysis, this advantage mainly comes from the reasonable design of the inorganic filler ratio. The optimization of the glass fiber length and carbon fiber ratio effectively reduces the thermal expansion coefficient of the material, so that its volume expansion at high temperature is strictly controlled. However, in Comparative Example 1, the glass fiber is too long and the ratio is too high, resulting in insufficient interfacial bonding strength, which ultimately causes thermal stress concentration.

[0070] Furthermore, the material of the present invention also exhibits excellent deformation resistance in long-term loading tests. The surface of the sample in Example 1 is smooth, with no obvious cracks or warping. This performance is closely related to the high heat resistance of the matrix material polyetheretherketone, while the low expansion characteristics of carbon fiber provide additional support. However, due to the insufficient carbon fiber content in Comparative Example 1, it is difficult to effectively disperse thermal stress, resulting in obvious warping and cracking. This difference further highlights the design advantages of the present invention.

[0071] Most importantly, the material of this invention demonstrates superior long-term performance under realistically simulated high-temperature operating conditions. This not only overcomes the structural failure problem of traditional materials caused by thermal expansion, but also provides reliable assurance for the stable operation of centrifugal pump components under harsh conditions. This performance is closely related to the optimized fiber-reinforced structure and thermally stable microstructure, successfully overcoming the bottlenecks of existing technologies.

[0072] Experiment 2: Thermal expansion performance test of materials Experimental description: Experimental objectives: By comparing the samples of Example 3 and Comparative Example 3, the effect of the synergistic stabilizer was evaluated and whether the thermal expansion performance of the material in a high-temperature environment was optimized was verified.

[0073] Experimental steps: Sample preparation: Shaft sleeve samples of Example 3 and Comparative Example 3 were prepared, with 3 pieces in each group.

[0074] In the sample of Example 3, a synergistic stabilizer (1.5% zinc acetylacetonate + 0.5% silane coupling agent) was used to enhance the interfacial bonding strength between the filler and the matrix.

[0075] The sample of Comparative Example 3 did not add a synergistic stabilizer, and the other ingredients were consistent with those of Example 3.

[0076] Experimental equipment: The linear expansion coefficient of the sample was measured using a thermomechanical analyzer (TMA). After the equipment was calibrated, the sample dimensions (length and diameter) were accurately measured and recorded.

[0077] Experimental environment: The heating range was set to 30°C to 150°C, and the heating rate was 10°C / min.

[0078] The temperature was maintained at 150°C for 10 min, and then naturally cooled to room temperature.

[0079] Data collection: The linear dimension change at every 10°C temperature interval was measured and the thermal expansion data was recorded.

[0080] Compare the expansion coefficients of the two groups of samples at high temperatures to analyze whether there are significant differences.

[0081] Experimental data: Temperature (℃) Example 3 Sample 1 Example 3 Sample 2 Example 3 Sample 3 Comparative Example 3 Sample 1 Comparative Example 3 Sample 2 Comparative Example 3 Sample 3 30 0.00 0.00 0.00 0.00 0.00 0.00 50 6.3 6.1 6.4 10.5 10.1 10.3 70 8.5 8.3 8.7 13.8 13.5 13.6 90 10.4 10.6 10.3 15.5 15.2 15.4 110 12.3 12.5 12.1 18.6 18.3 18.4 130 14.1 14.2 14.4 22.7 22.3 22.5 150 16.2 16.5 16.3 25.9 25.5 25.6 Experimental summary: The effect of the synergistic stabilizer is extremely significant under high temperature conditions. The linear expansion coefficient of the sample in Example 3 is much lower than that in Comparative Example 3 in the range of 30°C to 150°C. Through the optimization of the synergistic stabilizer, the bonding force between the filler and the matrix is ​​greatly enhanced. The distribution of glass fiber and carbon fiber is more uniform. This improvement effectively suppresses the concentrated release of stress within the material. In Comparative Example 3, due to the lack of interface strengthening, thermal expansion is significantly increased with increasing temperature, showing obvious dimensional instability.

[0082] Testing revealed that the expansion coefficient of the sample in Example 3 at 150°C was remarkably stable. This performance stems from the improved interfacial bonding of the filler, which enables the fibers to more effectively offset the impact of thermal expansion on the matrix. In contrast, in Comparative Example 3, loose interfacial bonding prevented the fibers from fully realizing their reinforcing properties, ultimately causing the material's expansion coefficient to increase by over 50%. This difference fundamentally illustrates the importance of synergistic stabilizers.

[0083] From an overall structural perspective, the addition of the synergistic stabilizer not only improves the thermal stability of the material but also creates a dense fiber matrix network. This network structure buffers thermal stress during heating and exhibits strong resistance to thermal deformation. In contrast, Comparative Example 3 fails to address the dimensional instability problem of traditional reinforced plastics at high temperatures. This advancement not only demonstrates the technical value of the synergistic stabilizer but also provides new ideas for the design of engineering plastics in high-temperature environments.

[0084] Experiment 3: Thermal Management Function Test Experimental description: Experimental objectives: By comparing the samples of Example 2 and Comparative Example 2, the thermal management capability of the microcapsulated phase change material under high temperature conditions was verified, with a focus on analyzing its role in temperature rise control and thermal stability.

[0085] Experimental steps: Sample preparation: Pump casing samples of Example 2 and Comparative Example 2 were prepared, with 3 pieces in each group.

[0086] Example 2 contains microencapsulated phase change material (fatty acid core, particle size 15 μm) at a mass fraction of 2%. Comparative Example 2 does not contain phase change material, and the remaining components are the same as Example 2.

[0087] Experimental setup: The sample was placed in a thermostat, the initial temperature was set at 50°C, and then heated to 150°C at a heating rate of 10°C / min.

[0088] Maintain a constant temperature at 150°C for 10 min and record the temperature rise curve of the sample surface.

[0089] Then it was cooled naturally to room temperature, and the sample was subjected to 10 consecutive heating and cooling cycles to monitor the fluctuation range of the surface temperature.

[0090] Data collection: Use an infrared thermal imager to record the changes in sample surface temperature in real time, and record the temperature rise rate during the heating process, as well as the temperature fluctuation amplitude of the sample during the thermal cycle test.

[0091] Experimental data: Test items Example 2 Sample 1 Example 2 Sample 2 Example 2 Sample 3 Comparative Example 2 Sample 1 Comparative Example 2 Sample 2 Comparative Example 2 Sample 3 Heating rate 7.5 7.2 7.4 10.3 10.0 10.2 Thermal cycle fluctuation range 3.8 4.0 3.7 7.2 7.1 7.4 Experimental summary: The addition of microencapsulated phase-change material enables the Example 2 sample to demonstrate significant temperature control during heating. Experimental data shows that the heating rate of Example 2 is significantly lower than that of Comparative Example 2, indicating that the phase-change material effectively slows the temperature rise by absorbing heat. This effect is achieved thanks to the uniform distribution capability of microencapsulation technology, which enables the phase-change material to quickly absorb heat and evenly diffuse it throughout the matrix. Comparative Example 2, however, lacks this thermal management capability, resulting in a higher heating rate due to concentrated heat and a tendency to cause localized overheating.

[0092] In thermal cycling tests, the sample from Example 2 exhibited smaller temperature fluctuations. This stability stems from the dynamic thermal regulation capability of the phase change material: it absorbs heat during the heating phase and releases it during the cooling phase, thus buffering against drastic temperature changes. However, the lack of this phase change mechanism in Comparative Example 2 resulted in significantly greater temperature fluctuations during thermal cycling, further demonstrating the limitations of traditional materials in high-temperature environments.

[0093] From a thermal management perspective, microencapsulation technology not only solves the leakage and stability issues associated with direct addition of phase change materials, but also ensures uniform dispersion within the composite material. Combined with the high heat resistance of the polymer matrix, this creates a composite system with both heat absorption and heat dissipation capabilities. This system clearly better meets practical requirements under high-temperature conditions, overcoming the localized heat accumulation issues that traditional materials struggle to address, providing a safer and more efficient material solution for high-temperature equipment.

[0094] Experiment 4: Mechanical Strength Test of Materials Experimental description: Experimental objectives: By comparing Example 1 and Comparative Example 5, the performance of the material of the present invention in terms of tensile strength and impact strength was tested, and the effect of optimizing the ratio of inorganic fillers on the mechanical properties was evaluated.

[0095] Experimental steps: Sample preparation: Standard test specimens of Example 1 and Comparative Example 5 were prepared, 3 pieces in each group.

[0096] The material of Example 1 contains 20% glass fiber and 12% carbon fiber.

[0097] In Comparative Example 5, the proportion of inorganic fillers was adjusted, with the glass fiber reduced to 10% and the carbon fiber increased to 20%.

[0098] Tensile strength test: The tensile strength of the samples was tested using an electronic universal testing machine.

[0099] The loading speed was set at 2 mm / min, and the test was continued until the sample broke, and the tensile stress (MPa) at the time of fracture was recorded.

[0100] Impact strength test: According to ASTM D256, the impact strength of the samples was tested using a simple beam impact tester.

[0101] The impact load is 5J, and the fracture absorption energy of the sample is recorded (kJ / m ² ).

[0102] Data Records: Record the tensile strength and impact strength of each sample, calculate the average value, observe the fracture morphology and evaluate the cause of fracture.

[0103] Experimental data: Sample number Tensile strength (MPa) <![CDATA[Impact strength (kJ / m ² )]]> Fracture morphology description Example 1-Sample 1 145.3 68.5 Uniform fracture, smooth fracture Example 1-Sample 2 147.1 70.2 Uniform fracture, smooth fracture Example 1-Sample 3 143.8 67.8 Uniform fracture, smooth fracture Comparative Example 5-Sample 1 122.4 56.3 Local tearing, rough fracture Comparative Example 5-Sample 2 124.1 58.1 Local tearing, rough fracture Comparative Example 5-Sample 3 120.7 55.6 Local tearing, rough fracture Experimental summary: The optimized design of inorganic fillers plays an important role in improving mechanical properties. The sample of Example 1 shows higher tensile strength and impact strength, demonstrating the significant synergistic reinforcement effect of glass fiber and carbon fiber. The uniform distribution of glass fiber provides rigid support for the matrix, while the high tensile modulus of carbon fiber further enhances the overall strength. In contrast, the reduction in the proportion of glass fiber in Comparative Example 5 weakens this rigid support, resulting in a decrease in fracture stress and inferior overall mechanical performance.

[0104] The fracture morphology of Example 1 is relatively smooth, demonstrating strong interfacial bonding between the fiber and the matrix. Under high load conditions, the fibers effectively disperse stress and delay fracture. In contrast, in Comparative Example 5, due to weakened interfacial bonding, the high proportion of carbon fibers failed to fully function, resulting in a rough, tearing fracture. Localized stress concentration at the fracture site further reduced impact strength.

[0105] These results demonstrate that the proportion of inorganic fillers not only influences the material's rigidity but also directly impacts its impact resistance. The present invention establishes a balanced reinforcement system through the rational design of fiber types and proportions. This system balances strength and toughness, significantly reducing the risk of impact damage while increasing tensile strength. The high strength and impact resistance demonstrated in the tests highlight the potential application value of the present material in demanding applications.

[0106] Experiment 5: Wear resistance test of materials Experimental description: Experimental objectives: The effect of microcapsule encapsulated phase change material on improving wear resistance was evaluated, and by comparing the samples of Example 3 and Comparative Example 6, the durability of the material of the present invention under high temperature and high pressure environment was verified.

[0107] Experimental steps: Sample preparation: Shaft sleeve samples of Example 3 and Comparative Example 6 were prepared, with 3 pieces in each group.

[0108] In Example 3, a microencapsulated phase change material (paraffin wax and fatty acid mixture, particle size 15 μm) was used, while in Comparative Example 6, a non-microencapsulated paraffin wax material was directly added.

[0109] Experimental equipment: The test was carried out using a friction and wear testing machine under controlled temperature and load conditions.

[0110] Equipped with a laser displacement sensor to measure the wear of the sample in real time.

[0111] Experimental environment settings: The temperature was set to 150°C to simulate high temperature conditions.

[0112] The normal load is 10 MPa, the sliding speed is 1 m / s, and the running time is 10 hours.

[0113] The wear depth was recorded every 2 hours, and the wear morphology of the sample surface was observed after the experiment.

[0114] Data recording and analysis: The wear volume of each sample during operation was recorded and the average value was calculated.

[0115] The surface wear characteristics of the samples were compared and the effect of microencapsulation technology on wear resistance was analyzed.

[0116] Experimental data: Test time (hours) Example 3 Sample 1 (mm) Example 3 Sample 2 (mm) Example 3 Sample 3 (mm) Comparative Example 6 Sample 1 (mm) Comparative Example 6 Sample 2 (mm) Comparative Example 6 Sample 3 (mm) 2 0.015 0.018 0.016 0.043 0.048 0.045 4 0.032 0.035 0.033 0.092 0.087 0.094 6 0.049 0.052 0.051 0.136 0.143 0.140 8 0.067 0.071 0.069 0.187 0.192 0.189 10 0.085 0.090 0.087 0.241 0.248 0.244 Surface morphology observation Smooth, few scratches Smooth, few scratches Smooth, few scratches Obvious wear grooves and debris accumulation Obvious wear grooves and debris accumulation Obvious wear grooves and debris accumulation Experimental summary: Microencapsulation technology plays a significant role in improving wear resistance. The data shows that the wear depth of the sample in Example 3 is significantly lower than that in Comparative Example 6. This significant difference can be attributed to the microencapsulated material releasing latent heat of phase change at high temperatures, reducing heat accumulation on the friction surface and thus adhesive wear at the interface. In Comparative Example 6, however, the directly added paraffin wax, due to its lack of microencapsulation, seeped out at high temperatures, preventing effective distribution and leading to lubrication failure and increased localized wear.

[0117] Observing the sample surface, Example 3 exhibited a smooth and uniform wear morphology, with only a few scratches. This demonstrates that the microcapsule structure provided continuous and stable lubrication during the friction process, and that the strength of the capsule shell also provided protection against wear. In contrast, Comparative Example 6 exhibited distinct deep grooves and accumulation of wear debris. This result suggests that unencapsulated paraffin wax was unable to withstand the friction load, resulting in a significant decrease in lubrication efficiency.

[0118] The mechanism behind this lubricating behavior lies in the stability and release pattern of the microcapsules. Through the capsules' thermally responsive release, the lubricant can be dynamically adjusted according to the friction environment, preventing rapid lubricant consumption while enhancing the surface's thermal management capabilities. In Comparative Example 6, the paraffin wax was directly exposed and rapidly lost upon heating, losing its heat absorption function and failing to form a sustained lubricating film. This fully demonstrates the critical role of microencapsulation technology in high-temperature operating conditions and provides a reliable basis for improving the long-term performance of materials under extreme conditions.

[0119] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A new material for high temperature resistant plastic centrifugal pump, characterized in that: Includes the following component materials: Polyetheretherketone: 60%~70%; Inorganic fillers: 25% to 35%; Microencapsulated phase change materials: 2% to 5%; Synergistic stabilizer: 2% to 3%; The inorganic filler includes but is not limited to glass fiber and carbon fiber.

2. A new high temperature resistant plastic centrifugal pump material according to claim 1, characterized in that: The mass percentage of the glass fiber in the inorganic filler is 15% to 25%, the mass percentage of the carbon fiber is 10% to 15%, and the average length of the glass fiber is 0.1 mm to 0.3 mm.

3. The new high-temperature resistant plastic centrifugal pump material according to claim 1 is characterized in that: The microcapsule-encapsulated phase change material comprises paraffin or fatty acid as a core phase change material, and an outer layer is coated with a polymer film. The particle size of the microcapsule-encapsulated phase change material ranges from 5 μm to 30 μm.

4. The new high-temperature resistant plastic centrifugal pump material according to claim 1, characterized in that: The synergistic stabilizer is zinc acetylacetonate, a silane coupling agent or a mixture thereof, wherein the mass percentage of zinc acetylacetonate is 1% to 2%, and the mass percentage of the silane coupling agent is 0.5% to 1%.

5. A method for preparing a high-temperature resistant plastic centrifugal pump new material, according to the high-temperature resistant plastic centrifugal pump new material according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, uniformly mixing polyetheretherketone powder, inorganic filler, microencapsulated phase change material and synergistic stabilizer; S2. heating the mixture at a temperature of 330° C. to 340° C. until it is molten, thereby forming a molten composite material; S3. Using a molding process, the molten composite material is cooled and solidified into centrifugal pump components.

6. The method for preparing a new material for a high-temperature resistant plastic centrifugal pump according to claim 5, characterized in that: In step S1, the microcapsulated phase change material is uniformly dispersed in the mixture.

7. The method for preparing a new material for a high-temperature resistant plastic centrifugal pump according to claim 5, characterized in that: In step S3, the molding process includes an injection molding process and an extrusion molding process.

8. The method for preparing a new material for a high-temperature resistant plastic centrifugal pump according to claim 5, characterized in that: In step S3, the injection molding pressure is 110 MPa to 130 MPa, and the mold temperature is 150° C. to 160° C.

9. The method for preparing a new material for a high-temperature resistant plastic centrifugal pump according to claim 5, characterized in that: In step S3, the thermal expansion coefficient of the composite material is controlled within a range of 0.3% to 0.5% under a constant temperature condition of 150°C.

10. A new material application of high temperature resistant plastic centrifugal pump, characterized in that: The new material is used to manufacture high-temperature resistant core components of centrifugal pumps, which are used in high-temperature working environments of nuclear power coolant circulation pumps, new energy fuel pumps and chemical medium conveying systems.

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