Vehicle-mounted refrigerator liner and preparation method thereof
By adding composite thermal conductivity to the material of the car-mounted refrigerator inner liner, the problem of insufficient thermal conductivity of the existing refrigerator inner liner is solved, and the refrigeration efficiency and energy efficiency are improved.
Patent Information
- Application Number
- CN202411384339.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-02-18
AI Technical Summary
The thermal conductivity of the existing refrigerator inner vessel is low, resulting in low refrigeration efficiency, affecting user experience and energy efficiency.
Add composite thermal conductivity agents, including carbon nanotubes, graphene and aluminum nitride, to the materials for preparing the in-vehicle refrigerator liner, to improve thermal conductivity by improving the thermal conductivity of the material.
By adding composite thermal conductivity, the thermal conductivity coefficient of the car-mounted refrigerator inner liner is significantly improved, the refrigeration efficiency is improved, energy is saved, and the preparation process is simplified.
Smart Images
Figure BDA0005070659700000101 
Figure BDA0005070659700000111
Abstract
Description
Technical Field
[0001] The invention belongs to the field of refrigerator manufacturing, and particularly relates to a vehicle-mounted refrigerator liner and a preparation method thereof. Background Art
[0002] The refrigerator liner is the part inside the refrigerator that is in direct contact with food. Its material and characteristics have an important impact on the quality, safety and user experience of the refrigerator. Currently, the most common material used to make refrigerator liners is acrylonitrile-butadiene-styrene copolymer (ABS), which is a common engineering plastic. The use of ABS to make refrigerator liners is simple and fast, with relatively low cost, and has certain chemical corrosion resistance and impact resistance. However, the thermal conductivity of ABS is low, at 0.02-0.046W / mK, which is not conducive to the rapid conduction of heat, thus affecting the refrigeration efficiency. Summary of the invention
[0003] In view of the deficiencies in the prior art, the present invention provides a vehicle refrigerator liner and a preparation method thereof, which adds a composite thermal conductor, increases the thermal conductivity of the vehicle refrigerator liner, is beneficial to the conduction of heat, thereby improving the refrigeration efficiency and saving energy.
[0004] In order to achieve the above object, the present invention adopts the following technical solutions:
[0005] On the one hand, the present invention provides a vehicle refrigerator liner, and the materials used to prepare the vehicle refrigerator liner include a base resin, a composite thermal conductor, a reinforcing agent, a compatibilizer, a lubricant, and an antioxidant, the base resin includes acrylonitrile-butadiene-styrene copolymer, and the composite thermal conductor includes carbon nanotubes, graphene and aluminum nitride.
[0006] It should be noted that carbon nanotubes have extremely high thermal conductivity, and their thermal conductivity mechanism is mainly through the propagation of phonons. Due to its one-dimensional structure, carbon nanotubes can form an effective heat conduction path in the material, significantly improving the thermal conductivity. Graphene is a two-dimensional material with a single layer of carbon atoms, which has excellent thermal conductivity and mechanical properties. The thermal conductivity of graphene comes from its unique π electron cloud and strong carbon-carbon bonds, which enable heat to propagate quickly within its plane. Aluminum nitride is a ceramic material with good thermal conductivity and electrical insulation. Its thermal conductivity is mainly achieved through phonon conduction in its crystal structure. The addition of aluminum nitride helps to improve the overall thermal conductivity of the composite material and provide higher thermal stability. In short, in the composite thermal conductor, carbon nanotubes and graphene can form a network structure, enhance the contact between fillers, and form a more effective thermal conduction path. The addition of aluminum nitride further fills the gap and improves the thermal conductivity of the material. The present invention adds a composite thermal conductor, increases the thermal conductivity of the inner tank of the vehicle refrigerator, is conducive to the conduction of heat, thereby improving the refrigeration efficiency and saving energy.
[0007] Preferably, the mass fraction of the matrix resin is 30-80%; the mass fraction of the composite thermal conductor is 0.1-50%; the mass fraction of the enhancer is 5-50%; the mass fraction of the compatibilizer is 0.2-12%; the mass fraction of the lubricant is 0.1-5%; and the mass fraction of the antioxidant is 0.1-4%.
[0008] Preferably, the mass ratio of carbon nanotubes, graphene and aluminum nitride is (0.1-5):(0.1-5):(1-50).
[0009] Preferably, the composite thermal conductor also includes: silane coupling agent KH570, water and surfactant OP-10. It should be noted that the use of silane coupling agent (such as KH570) can improve the interface bonding between filler and matrix (such as ABS), enhance the interface interaction, and help improve the thermal conductivity efficiency. Improve dispersibility: OP-10 can reduce the surface tension of fillers such as carbon nanotubes, graphene and aluminum nitride in the matrix material, help these fillers to be more evenly dispersed in the mixture, and avoid agglomeration. Adding surfactant OP-10 improves the interaction between filler and matrix (such as ABS). OP-10 can enhance the physical and chemical bonding of the composite thermal conductor, improve the effectiveness of the filler, and thus improve the thermal conductivity. OP-10 can provide a certain stability, prevent the sedimentation or separation of the filler during mixing and processing, and maintain the performance consistency of the composite thermal conductor. During high-temperature processing, OP-10 can reduce the viscosity of the material, making the mixing and extrusion process smoother and reducing energy consumption.
[0010] Preferably, the mass ratio of the silane coupling agent KH570, water and surfactant OP-10 is (1-5):(20-50):(1-5).
[0011] Preferably, the ratio of the sum of the mass of the carbon nanotubes, graphene and aluminum nitride to the sum of the mass of the silane coupling agent KH570, water and surfactant OP-10 is 1:
[0012] (10-50).
[0013] Preferably, the reinforcing agent comprises glass fiber or carbon fiber; and / or,
[0014] The compatibilizer includes ethylene-maleic anhydride copolymer or maleic anhydride graft; and / or,
[0015] The lubricant includes polyethylene terephthalate, silicone powder or polytetrafluoroethylene; and / or,
[0016] The antioxidant comprises one or more combinations of tetrakis[β(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) 2,4,6-trimethylbenzene, 4,4'-butylenebis(6-tert-butyl-3-methylphenol), 2,6-di-tert-butyl-4-methylphenol and bis(3,5-di-tert-butylphenyl) pentaerythritol diphosphite.
[0017] In another aspect, the present invention provides a method for preparing the vehicle refrigerator liner, comprising the following steps:
[0018] S1, mixing the base resin, composite thermal conductor, reinforcing agent, compatibilizer, lubricant and antioxidant to obtain a mixture;
[0019] S2, drying the mixture and then performing injection molding to obtain a car refrigerator liner.
[0020] In the above technical solution, a twin-screw extruder can be used for injection molding. During the extrusion process, the temperature of each section of the twin-screw extruder is: the temperature of zone 1 is 265°C, the temperature of zone 2 is 285°C, the temperature of zone 3 is 295°C, the temperature of zone 4 is 305°C, the temperature of zone 5 is 315°C, the temperature of zone 6 is 290°C, the temperature of zone 7 is 280°C, the temperature of zone 8 is 260°C, and the head temperature is 280°C. The inner tank of a vehicle refrigerator is prepared by the preparation method of the present invention, and the preparation method is simple and quick, and the prepared inner tank has good thermal conductivity.
[0021] Preferably, in step S2, the injection molding temperature is 200-250°C, the pressure is 70 MPa, the holding time is 0-30s, and the mold temperature is 90°C.
[0022] Preferably, in step S1, the specific step of mixing is to first mix the base resin, composite thermal conductor, compatibilizer, lubricant and antioxidant, and then add the reinforcing agent to form the mixture during the mixing and melting process to obtain the mixture.
[0023] In the above technical solution, reinforcing agent (to protect carbon fiber) is added during the molding process, which can maintain the fiber length after molding as much as possible, and carbon fiber is not added in the early stage of mixing, which can ensure that other substances are mixed more evenly.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] (1) The present invention adds a composite thermal conductor, which includes carbon nanotubes, graphene and aluminum nitride. Carbon nanotubes have extremely high thermal conductivity, and their thermal conduction mechanism is mainly through the propagation of phonons. Due to their one-dimensional structure, carbon nanotubes can form an effective heat conduction path in the material, significantly improving the thermal conductivity. Graphene is a two-dimensional material with a single layer of carbon atoms and has excellent thermal conductivity and mechanical properties. The thermal conductivity of graphene comes from its unique π electron cloud and strong carbon-carbon bonds, which enable heat to propagate rapidly within its plane. Aluminum nitride is a ceramic material with good thermal conductivity and electrical insulation. Its thermal conductivity is mainly achieved through phonon conduction in its crystal structure. The addition of aluminum nitride helps to improve the overall thermal conductivity of the composite material and provide higher thermal stability. In short, in the composite thermal conductor, carbon nanotubes and graphene can form a network structure, enhance the contact between fillers, and form a more effective thermal conduction path. The addition of aluminum nitride further fills the gaps and improves the thermal conductivity of the material. The present invention adds a composite heat conductor, increases the thermal conductivity of the inner container of the vehicle refrigerator, is beneficial to the conduction of heat, thereby improving the refrigeration efficiency and saving energy.
[0026] (2) The present invention also adds silane coupling agent KH570 and surfactant OP-10. The use of silane coupling agent (such as KH570) can improve the interface bonding between filler and matrix (such as ABS), enhance the interface interaction, and help improve the thermal conductivity efficiency. Improve dispersibility: OP-10 can reduce the surface tension of fillers such as carbon nanotubes, graphene and aluminum nitride in the matrix material, help these fillers to be more evenly dispersed in the mixture, and avoid agglomeration. Adding surfactant OP-10 improves the interaction between filler and matrix (such as ABS). OP-10 can enhance the physical and chemical bonding of the composite thermal conductor, improve the effectiveness of the filler, and thus improve the thermal conductivity. OP-10 can provide a certain stability, prevent the sedimentation or separation of the filler during mixing and processing, and maintain the performance consistency of the composite thermal conductor. During high-temperature processing, OP-10 can reduce the viscosity of the material, making the mixing and extrusion process smoother and reducing energy consumption. DETAILED DESCRIPTION
[0027] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.
[0028] Example 1
[0029] The invention provides a vehicle refrigerator liner with a total weight of 100g. Materials for preparing the vehicle refrigerator liner include: 30% by mass of ABS, 20% by mass of a composite thermal conductor, 40% by mass of carbon fiber, 6% by mass of a polyolefin elastomer-maleic anhydride graft copolymer (POE-g-MAH), 2% by mass of silicone powder, and 2% by mass of pentaerythritol tetrakis[β(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]. The preparation method of the composite thermal conductor is as follows: carbon nanotubes, graphene, and aluminum nitride are mixed in a mass ratio of 1:1:10 for 10 minutes to obtain a mixture A; silane coupling agent KH570, water, and OP-10 are mixed in a mass ratio of 1:30:5 to obtain a mixture B; mixture A is added to mixture B, the mass ratio of mixture A to mixture B is 1:30, ultrasonic dispersion is performed for 10 minutes, the ultrasonic dispersion temperature is 50°C, and drying is performed at 100°C for 1 hour to obtain a composite thermal conductor.
[0030] The obtained ABS, composite thermal conductive agent, POE-g-MAH, silicone powder and oxidant are pre-dispersed in a high mixer, and then fed into the hopper of a twin-screw extruder. Carbon fiber is added from the side feed port for mixing and granulation. During the extrusion process of the twin-screw extruder, the temperature of each section is: the temperature of zone 1 is 265°C, the temperature of zone 2 is 285°C, the temperature of zone 3 is 295°C, the temperature of zone 4 is 305°C, the temperature of zone 5 is 315°C, the temperature of zone 6 is 290°C, the temperature of zone 7 is 280°C, the temperature of zone 8 is 260°C, and the temperature of the die head is 280°C, and a thermal conductive plastic is obtained. After the above thermal conductive plastic is dried at 90°C for 2h, it is molded by an injection molding machine. The injection molding process is: temperature 250°C, pressure 70MPa, holding time 30 seconds, and mold temperature 90°C.
[0031] Example 2
[0032] The present invention provides a vehicle refrigerator liner, with a total weight of 100g, and the materials used to prepare the vehicle refrigerator liner include: ABS with a mass fraction of 60%, a composite thermal conductor with a mass fraction of 10%, carbon fiber with a mass fraction of 20%, polyolefin elastomer-maleic anhydride graft copolymer (POE-g-MAH) with a mass fraction of 8%, silicone powder with a mass fraction of 1%, and an antioxidant with a mass fraction of 1%. The preparation method of the composite thermal conductor is as follows: carbon nanotubes, graphene, and aluminum nitride are mixed at a mass ratio of 0.5:0.5:10 for 10 minutes to obtain a mixture A; silane coupling agent KH570, water, and OP-10 are mixed at a mass ratio of 1:20:5 to obtain a mixture B, and the mixture A is added to the mixture B, the mass ratio of the mixture A to the mixture B is 1:20, ultrasonic dispersion is performed for 10 minutes, the ultrasonic dispersion temperature is 50°C, and drying is performed at 100°C for 1 hour to obtain a composite thermal conductor.
[0033] The obtained ABS, composite thermal conductive agent, POE-g-MAH, silicone powder and oxidant are pre-dispersed in a high mixer, and then fed into the hopper of a twin-screw extruder. Carbon fiber is added from the side feed port for mixing and granulation. During the extrusion process of the twin-screw extruder, the temperature of each section is: the temperature of zone 1 is 265°C, the temperature of zone 2 is 285°C, the temperature of zone 3 is 295°C, the temperature of zone 4 is 305°C, the temperature of zone 5 is 315°C, the temperature of zone 6 is 290°C, the temperature of zone 7 is 280°C, the temperature of zone 8 is 260°C, and the temperature of the die head is 280°C, and a thermal conductive plastic is obtained. After the above thermal conductive plastic is dried at 90°C for 2h, it is molded by an injection molding machine. The injection molding process is: temperature 250°C, pressure 70MPa, holding time 30 seconds, and mold temperature 90°C.
[0034] Example 3
[0035] The invention provides a vehicle refrigerator liner with a total weight of 100g. Materials for preparing the vehicle refrigerator liner include: ABS with a mass fraction of 80%, a composite thermal conductor with a mass fraction of 0.1%, carbon fiber with a mass fraction of 15.5%, a polyolefin elastomer-maleic anhydride graft copolymer (POE-g-MAH) with a mass fraction of 0.1%, silicone powder with a mass fraction of 0.1%, and an antioxidant with a mass fraction of 0.1%. The preparation method of the composite thermal conductor is as follows: carbon nanotubes, graphene, and aluminum nitride are mixed in a mass ratio of 0.75:0.75:10 for 10 minutes to obtain a mixture A; silane coupling agent KH570, water, and OP-10 are mixed in a mass ratio of 1:25:5 to obtain a mixture B; mixture A is added to mixture B, the mass ratio of mixture A to mixture B is 1:25, ultrasonic dispersion is performed for 10 minutes, the ultrasonic dispersion temperature is 50°C, and drying is performed at 100°C for 1 hour to obtain a composite thermal conductor.
[0036] The obtained ABS, composite thermal conductive agent, POE-g-MAH, silicone powder and oxidant are pre-dispersed in a high mixer, and then fed into the hopper of a twin-screw extruder. Carbon fiber is added from the side feed port for mixing and granulation. During the extrusion process of the twin-screw extruder, the temperature of each section is: the temperature of zone 1 is 265°C, the temperature of zone 2 is 285°C, the temperature of zone 3 is 295°C, the temperature of zone 4 is 305°C, the temperature of zone 5 is 315°C, the temperature of zone 6 is 290°C, the temperature of zone 7 is 280°C, the temperature of zone 8 is 260°C, and the temperature of the die head is 280°C, and a thermal conductive plastic is obtained. After the above thermal conductive plastic is dried at 90°C for 2h, it is molded by an injection molding machine. The injection molding process is: temperature 250°C, pressure 70MPa, holding time 30 seconds, and mold temperature 90°C.
[0037] Example 4
[0038] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that the obtained ABS, composite thermal conductor, POE-g-MAH, silicone powder and oxidant are pre-dispersed in a high mixer, and then input into the hopper of a twin-screw extruder. During the extrusion process of the twin-screw extruder, the temperature of each section is: the temperature of zone 1 is 265°C, the temperature of zone 2 is 285°C, the temperature of zone 3 is 295°C, the temperature of zone 4 is 305°C, the temperature of zone 5 is 315°C, the temperature of zone 6 is 290°C, the temperature of zone 7 is 280°C, the temperature of zone 8 is 260°C, and the temperature of the die head is 280°C. After sufficient melt mixing, the roving is input into the impregnation die. The carbon fiber roving is passed through a traction creel and enters the impregnation die. The roving is forced to spread in the die, so that each monofilament is fully impregnated and coated by the pre-plasticized melt, and then bundled, cooled, pelletized and packaged, wherein the pelletized particles have a length of 10 mm.
[0039] Example 5
[0040] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that carbon nanotubes, graphene, and aluminum nitride are mixed in a mass ratio of 0.1:0.1:1 for 10 minutes to obtain a mixture A; silane coupling agent KH570, water, and OP-10 are mixed in a mass ratio of 1:20:1 to obtain a mixture B, and the mixture A is added to the mixture B, and the mass ratio of the mixture A to the mixture B is 1:10.
[0041] Example 6
[0042] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that carbon nanotubes, graphene, and aluminum nitride are mixed in a mass ratio of 5:5:50 for 10 minutes to obtain a mixture A; silane coupling agent KH570, water, and OP-10 are mixed in a mass ratio of 5:50:5 to obtain a mixture B, and the mixture A is added to the mixture B, and the mass ratio of the mixture A to the mixture B is 1:50.
[0043] Example 7
[0044] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that the total weight is 100g, and the materials used to prepare the vehicle refrigerator liner include: 30% by mass ABS, 50% by mass composite thermal conductor, 10% by mass carbon fiber, 8% by mass polyolefin elastomer-maleic anhydride graft copolymer (POE-g-MAH), 1% by mass silicone powder, and 1% by mass antioxidant.
[0045] Example 8
[0046] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that the total weight is 100g, and the materials used to prepare the vehicle refrigerator liner include: 30% by mass ABS, 10% by mass composite thermal conductor, 50% by mass carbon fiber, 8% by mass polyolefin elastomer-maleic anhydride graft copolymer (POE-g-MAH), 1% by mass silicone powder, and 1% by mass antioxidant.
[0047] Comparative Example 1
[0048] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that no composite thermal conductive agent is added, and the mass fraction of ABS is 70%.
[0049] Comparative Example 2
[0050] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that a composite thermal conductor carbon nanotube, graphene, aluminum nitride, coupling agent KH570, and dispersant EBS are added in sequence in a mass ratio of 0.5:0.5:10:0.2:0.1 and mixed in a high-speed mixer for 30 minutes to obtain a composite thermal conductor.
[0051] Comparative Example 3
[0052] The present invention provides a vehicle refrigerator liner, and the preparation method is the same as that of Example 2, except that no aluminum nitride is added to the composite thermal conductor, and the mass ratio of carbon nanotubes to graphene is 1:1.
[0053] Performance testing and results
[0054] The refrigerator liners obtained from Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests, and the results are shown in Table 1.
[0055] Table 1
[0056]
[0057]
[0058] Conclusion, combined with Table 1, it can be seen that the thermal conductivity of the refrigerator liner prepared in the embodiment of the present invention is significantly better than that of the comparative example, and Example 4 has higher thermal conductivity and mechanical properties.
[0059] Other raw materials or structures not specifically described in the present invention already exist in the prior art and can be directly purchased from the market.
[0060] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A car refrigerator liner, characterized in that: The materials used to prepare the inner tank of the car refrigerator include: a base resin including acrylonitrile-butadiene-styrene copolymer; Composite thermal conductors, including carbon nanotubes, graphene, and aluminum nitride; Enhancer; Compatibilizer; Lubricants; and, Antioxidant.
2. The vehicle refrigerator liner according to claim 1, characterized in that: The mass fraction of the matrix resin is 30-80%; the mass fraction of the composite thermal conductor is 0.1-50%; the mass fraction of the reinforcing agent is 5-50%; the mass fraction of the compatibilizer is 0.2-12%; the mass fraction of the lubricant is 0.1-5%; and the mass fraction of the antioxidant is 0.1-4%.
3. The vehicle refrigerator liner according to claim 1, characterized in that: The mass ratio of carbon nanotubes, graphene and aluminum nitride is (0.1-5):(0.1-5):(1-50).
4. The vehicle refrigerator liner according to claim 1, characterized in that: The composite thermal conductor also includes: silane coupling agent KH570, water and surfactant OP-10.
5. The vehicle refrigerator liner according to claim 4, characterized in that: The mass ratio of the silane coupling agent KH570, water and surfactant OP-10 is (1-5):(20-50):(1-5).
6. The vehicle refrigerator liner according to claim 5, characterized in that: The ratio of the sum of the mass of the carbon nanotubes, graphene and aluminum nitride to the sum of the mass of the silane coupling agent KH570, water and surfactant OP-10 is 1:(10-50).
7. The vehicle refrigerator liner according to claim 1, characterized in that: The reinforcing agent comprises glass fiber or carbon fiber; and / or, The compatibilizer includes ethylene-maleic anhydride copolymer or maleic anhydride graft; and / or, The lubricant includes polyethylene terephthalate, silicone powder or polytetrafluoroethylene; and / or, The antioxidant includes one or more combinations of tetrakis[β(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)2,4,6-trimethylbenzene, 4,4'-butylenebis(6-tert-butyl-3-methylphenol), 2,6-di-tert-butyl-4-methylphenol and bis(3,5-di-tert-butylphenyl)pentaerythritol diphosphite.
8. The method for preparing a vehicle refrigerator liner according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, mixing the base resin, composite thermal conductor, reinforcing agent, compatibilizer, lubricant and antioxidant to obtain a mixture; S2, drying the mixture and then performing injection molding to obtain a car refrigerator liner.
9. The method according to claim 8, characterized in that In step S2, the injection molding temperature is 200-250°C, the pressure is 70 MPa, the holding time is 0-30s, and the mold temperature is 90°C.
10. The method according to claim 8, characterized in that In step S1, the specific steps of mixing are: firstly, the base resin, the composite thermal conductor, the compatibilizer, the lubricant and the antioxidant are mixed, and then, during the mixing and melting process, the reinforcing agent is added to form a mixture.