A high-temperature-resistant and impact-resistant modified ABS material applied to air conditioner structural products and a preparation method thereof

Abstract

The application relates to the field of high polymer materials, and particularly discloses a high-temperature-resistant and impact-resistant modified ABS material applied to air conditioner structure products and a preparation method and application thereof. The high-temperature-resistant and impact-resistant modified ABS material applied to air conditioner structure products comprises the following raw materials in parts by weight: 55-75 parts of ABS resin, 15-20 parts of a heat-resistant modifier, 5-10 parts of short-cut glass fiber, 2-5 parts of a corrosion-resistant auxiliary agent, 5-10 parts of reinforcing filler, 8-15 parts of a toughening agent, 3-6 parts of a compatilizer, 0.5-1 part of an antioxidant, and 0.6-1.5 parts of a lubricant. The heat-resistant modifier comprises PMMA resin, maleimide binary copolymer and high glue powder in a mass ratio of 2:1-1.5:0.5-1. The ABS composite material has excellent high-temperature resistance, good low-temperature impact resistance and corrosion resistance.

Description

Technical Field

[0001] This application relates to the field of polymer materials technology, and more specifically, it relates to a high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products and its preparation method. Background Technology

[0002] Acrylonitrile-butadiene-styrene copolymer (ABS) resin is widely used in the manufacture of structural components such as air outlet frames, fan blades, and internal supports for air conditioners due to its excellent comprehensive mechanical properties, processing fluidity, and dimensional stability. However, in actual use, air conditioner structural components are subjected to complex operating environments for extended periods, placing higher demands on the material's heat resistance, low-temperature impact resistance, and chemical media stability.

[0003] First, the internal temperature environment of an air conditioner changes drastically during summer cooling or winter heating. For example, the frame and fan blades near the air outlet are exposed to high temperatures in summer, with temperature rises reaching 85-90℃. The heat distortion temperature of ordinary ABS resin is typically ≤80℃. Prolonged service under conditions approaching or exceeding this temperature can cause the material to soften and deform, leading to fan blade jamming, failure of moving parts, and even deformation of the entire unit, severely impacting the air conditioner's reliability and lifespan.

[0004] Secondly, air conditioner outdoor units are exposed to the outdoor environment for extended periods, especially in cold winter regions where outdoor temperatures can reach -20°C or even lower. Ordinary ABS resin experiences restricted molecular chain movement at low temperatures, resulting in a significant decrease in material toughness. This makes it prone to brittleness and cracking due to external impacts or vibrations in low-temperature environments, posing a safety hazard.

[0005] Furthermore, air conditioner structural components inevitably come into slight contact with refrigerants (such as Freon and hydrofluoroolefins) and lubricants (such as mineral oil and synthetic ester oil) during use. Ordinary ABS resin has relatively insufficient oil resistance, weather resistance, and corrosion resistance. After long-term contact with such chemical media, the material surface is easily corroded, and the internal structure swells or degrades, resulting in yellowing of the appearance, a sharp decline in mechanical properties, and thus shortening the service life of the components.

[0006] Regarding the aforementioned technologies, the inventors believe that ordinary AB materials are difficult to simultaneously meet the comprehensive performance requirements of air conditioning structural components in terms of high-temperature softening, low-temperature crack resistance, and resistance to chemical corrosion. Summary of the Invention

[0007] In order to develop an ABS material with excellent high-temperature resistance, good low-temperature impact resistance and corrosion resistance, this application provides a high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products and its preparation method.

[0008] In a first aspect, this application provides a high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, employing the following technical solution:

[0009] A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, comprising the following raw materials by weight: 55-75 parts ABS resin, 15-20 parts heat-resistant modifier, 5-10 parts chopped glass fiber, 2-5 parts corrosion-resistant additive, 5-10 parts reinforcing filler, 8-15 parts toughening agent, 3-6 parts compatibilizer, 0.5-1 part antioxidant, and 0.6-1.5 parts lubricant; wherein the heat-resistant modifier comprises PMMA resin, maleimide copolymer, and high-polymer powder in a mass ratio of 2:1-1.5:0.5-1.

[0010] By adopting the above technical solution, the maleimide binary copolymer contains rigid groups and reactive structures. As rigid particles, it is uniformly dispersed in ABS material, restricting the degree of freedom of ABS molecular chains, increasing the rigidity of the load-bearing material, and improving heat resistance. Its rigid structure reduces the degree of freedom of molecular chains, reduces the penetration of small molecule media, and improves chemical resistance. PMMA resin has a high Tg temperature, high modulus, and polarity, which can enhance the overall heat resistance and rigidity of the composite material. In addition, PMMA has excellent weather resistance, oil resistance, and chemical media resistance, and has good resistance to refrigerants and lubricants, and is not prone to yellowing. High-rubber powder provides the rubber phase as a toughening component. It absorbs impact energy and induces crimping; chopped glass fiber, as an inorganic rigid filler, forms a skeleton structure in the matrix, significantly inhibiting creep and softening at high temperatures, increasing heat distortion temperature, and blocking the penetration path of corrosive media, thus enhancing chemical corrosion resistance; maleimide binary copolymer restricts chain segment movement at the molecular level, while glass forms a supporting skeleton at the macroscopic level, and the two have a synergistic effect in improving heat distortion temperature; the ester structure of PMMA endows the composite material with excellent oil resistance and chemical resistance, while the rigid structure of the maleimide binary copolymer reduces the permeability of the medium. The combination of the two can significantly improve the long-term stability of ABS materials in refrigerant and lubricating oil environments.

[0011] Preferably, the chopped glass fibers undergo the following pretreatment:

[0012] Short glass fibers were chemically etched and then immersed in KH580 hydrolysate. They were soaked at 70°C for 30-50 minutes, filtered, washed, and dried to obtain pretreated fibers.

[0013] Phenylated phosphoric acid was added to an ethanol / water mixture, followed by lanthanum chloride heptahydrate solution and pretreated fibers. The pH was adjusted to 2, the temperature was raised to 85-100℃, and the mixture was kept at that temperature for 20-24 hours. The mixture was then filtered, washed, and dried to constant weight.

[0014] By adopting the above technical solution, chemical etching is used to generate more silanol groups on the surface of chopped glass fibers, providing reactive sites for subsequent silane coupling agents. At the same time, etching increases surface roughness, which is beneficial for mechanical anchoring. Then, surface treatment is performed using KH580 hydrolysate, which forms silanol groups after hydrolysis. These groups undergo a condensation reaction with the silanol groups on the surface of the chopped glass fibers, forming a self-assembled monolayer on the fiber surface and introducing thiol functional groups. Then, under hydrothermal treatment, lanthanum ions are reacted with phenylphosphonic acid solution to synthesize layered lanthanum metal phosphonate. The thiol groups on KH580 can react with unsaturated bonds or polar groups in ABS / PMMA resins to form covalent bonds. The lanthanum ions in the layered lanthanum phosphonate can form coordination interactions with polar groups in the matrix resin, such as ester groups in PMMA and nitrile groups in ABS. In addition, the layered structure forms a nano-rough structure on the fiber surface, which enhances mechanical anchoring, improves the interfacial bonding strength between chopped glass fibers and the matrix resin, and increases tensile and flexural strength. Furthermore, the layered lanthanum phosphonate has inorganic properties and high thermal stability, forming a thermal barrier at the fiber-resin interface, increasing the heat distortion temperature, and improving interfacial stability at high temperatures. At the same time, the dense layered lanthanum phosphonate coating can block the capillary penetration of corrosive media such as refrigerants and lubricants along the fiber-resin interface, enhance the interfacial sealing and barrier effect, and improve long-term anti-aging performance.

[0015] Preferably, the corrosion-resistant additive is hydrophobically modified microfibrillated cellulose.

[0016] By adopting the above technical solution, the interfacial compatibility between microfibrillated cellulose and the non-polar ABS matrix is ​​improved after hydrophobic modification, reducing agglomeration and allowing for uniform dispersion in the matrix. Moreover, microfibrillated cellulose has a high specific surface area and high aspect ratio, which can endow the composite material with excellent tensile strength and modulus. Furthermore, after hydrophobic modification, it forms a good interfacial bond with the ABS matrix, and the fiber pull-out and crack deflection mechanism can absorb impact energy, thereby playing a role in interfacial toughening. At the same time, the nanoscale reinforcing network formed by it can improve stress transmission, inhibit high-temperature creep, and improve heat resistance.

[0017] Preferably, the hydrophobically modified microfibrillated cellulose is polyaniline-stearic acid-modified microfibrillated cellulose.

[0018] By adopting the above technical solutions, polyaniline has a rigid aromatic ring structure and a high thermal decomposition temperature, which can restrict the movement of matrix molecular chains and improve heat resistance. Moreover, polyaniline has a certain barrier effect on chemical media, which can delay the penetration of refrigerants and lubricants and improve chemical corrosion resistance. In addition, the conjugated structure of polyaniline has a certain free radical scavenging ability, which can improve chemical corrosion resistance and enhance anti-yellowing ability.

[0019] Preferably, the high-polymer powder is prepared by mixing and granulating ABS high-polymer powder and graphene at a mass ratio of 1:0.1-0.2.

[0020] By adopting the above technical solution, graphene has a two-dimensional sheet structure. In the ABS matrix, these sheet structures can form tortuous paths, extending the distance that refrigerant and lubricant molecules can penetrate through the material, forming a physical barrier effect. The nickel layer covers the defects at the edges of the graphene, preventing corrosive media from penetrating along the micro-gap between the graphene and the matrix. The high-resin powder, as a rubber phase, can fill the interface between the graphene sheets and the ABS resin, absorbing the internal stress generated by swelling and preventing microcracks from expanding into macro-cracks. In addition, it improves the resistance to environmental stress cracking, thereby indirectly improving the corrosion resistance. Furthermore, graphene can significantly improve the tensile strength and flexural modulus of ABS materials and increase heat resistance.

[0021] Preferably, the reinforcing filler is selected from at least one of montmorillonite, mica, graphene, talc, and silica.

[0022] Preferably, the toughening agent is selected from at least one of hydrogenated styrene-butadiene block copolymer, polyolefin elastomer propylene-based elastomer, and maleic anhydride-grafted polyethylene.

[0023] Preferably, the compatibilizer is selected from at least one of maleic anhydride-grafted PE, maleic anhydride-grafted PP, and maleic anhydride-grafted SEBS.

[0024] Preferably, the antioxidant is selected from at least one of antioxidant 1076, antioxidant 1010, antioxidant 126 and antioxidant 1680.

[0025] Secondly, this application provides a method for preparing a high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, employing the following technical solution:

[0026] A method for preparing a high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products includes the following steps:

[0027] ABS resin is mixed with heat-resistant modifier, toughening agent, corrosion-resistant additive, reinforcing filler, compatibilizer, antioxidant, and lubricant, and added to the main feed hopper. Short glass fibers are added to the side feed hopper. The mixture is then extruded and granulated to obtain composite granules. The composite granules are injection molded and irradiated with 60-80 kGy.

[0028] By adopting the above technical solution, the maleimide binary copolymer in the heat-resistant additive acts as a rigid ion, which is uniformly dispersed in the matrix, restricting the degree of freedom of ABS, increasing the rigidity of the load-bearing material, and improving the heat resistance. Moreover, the reactive functional groups in it undergo a solid interface reaction with ABS under irradiation, which improves the interface strength and enhances the rigidity. In the heat-resistant modifier, the high-rubber powder is uniformly dispersed in the matrix. Due to stress concentration, voids are generated at the interface with the matrix, forming cavitation. The acid production of the voids induces shear bands in the ABS matrix. Through shear yielding, a large amount of energy is consumed, which improves the impact strength of the composite material.

[0029] In summary, this application has the following beneficial effects:

[0030] 1. Since this application uses PMMA, maleimide copolymer and high-rubber powder as heat-resistant modifiers and adds chopped glass fiber as inorganic fiber filler, the heat distortion temperature of the composite material is improved through the synergistic effect of maleimide copolymer and chopped glass fiber. The low-temperature toughness of the composite material is improved through the synergistic effect of high-rubber powder and toughening agent. Furthermore, the combination of PMMA and maleimide copolymer improves the material's oil resistance and refrigerant corrosion resistance, and can inhibit yellowing and performance degradation.

[0031] 2. In this application, chemical etching, KH580 and layered lanthanum phosphonate are preferably used to pretreat chopped glass fibers. The layered lanthanum phosphonate loaded on the chopped glass fibers has the functions of thermal barrier and interface toughening, and can also act as a corrosion barrier. Therefore, it can further improve the heat resistance and corrosion resistance of the composite material, and achieve a balance between rigidity and toughness.

[0032] 3. In this application, the fiber reinforcement effect of microfibrillated cellulose, the interfacial compatibility improvement and small molecule penetration resistance effect of stearic acid, and the heat resistance enhancement effect of polyaniline can further enhance the strength, toughness and heat resistance of the composite material, while improving chemical resistance.

[0033] 4. In this application, nickel-plated graphene is added to the high-resin powder. The nickel-plated graphene can be selectively distributed in the high-resin powder, disrupting the formation of continuous permeation channels, thereby improving the overall barrier properties of ABS composite materials against corrosive media, while also enhancing rigidity and toughness and increasing heat resistance. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] Example 1: Preparation of maleimide binary copolymer: 30 mL of DMF and initiator AIBN (0.264 g) were mixed, nitrogen gas was introduced at room temperature to remove oxygen, and the temperature was raised to 60 °C. N-(4-fluorophenyl)maleimide (3.825 g) and triallyl isocyanurate with a molar ratio of 1:0.6 were added, the temperature was raised to 90 °C, and the reaction was carried out for 6 h. After cooling to room temperature, the mixture was poured into petroleum ether to precipitate, and the residual DMF was removed by filtration. The mixture was then dissolved in acetone, precipitated in petroleum ether, and filtered. This process was repeated several times, and the mixture was vacuum dried at 60 °C for 14 h.

[0036] Example 2 of preparation of hydrophobically modified microfibrillated cellulose: (1) Disperse microfibrillated cellulose in water to make a suspension with a concentration of 5 wt%, add stearic acid of 2 wt% of the mass of microfibrillated cellulose to it, stir for 1 h, dry, and obtain stearic acid modified microfibrillated cellulose. The microfibrillated cellulose is selected from Shenzhen Qihong New Materials, model MFC-64.

[0037] (2) Add 0.08g aniline, 6.314g concentrated hydrochloric acid (37%) and 8g stearic acid modified microfibrillated cellulose to deionized water to make the volume of the mixed solution 64mL; then stir at 5℃ for 25min, then dissolve 0.132g ammonium persulfate in 24mL of 1mol / L hydrochloric acid solution and slowly add it dropwise to the above mixed solution, stir at 5℃ for 4h to obtain a suspension, centrifuge with deionized water 5 times, dry, and obtain polyaniline composite stearic acid modified microfibrillated cellulose.

[0038] Example

[0039] The

[0040] Example 1: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products. The raw material amounts are shown in Table 1. The ABS resin is selected from PetroChina Jilin Chemical Co., Ltd., model 0215A. The heat-resistant modifier is prepared by mixing PMMA resin, maleimide copolymer, and high-polymer powder in a mass ratio of 2:1.5:1. The maleimide copolymer is prepared from Preparation Example 1. The PMMA resin has a melt index of 1.8 g / 10 min and a density of 1.19 g / cm³. 3The following materials were selected: CM-205 from Chi Mei Chemical Co., Ltd., ABS high-rubber powder from Shanghai Jiuwu New Materials Co., Ltd., American Sabiq B338, 5mm chopped glass fiber, hydrophobic modified microfibrillated cellulose (SMR) as the corrosion resistant additive, stearic acid modified microfibrillated cellulose, and step (1) in Preparation Example 2. The reinforcing filler was montmorillonite, the toughening agent was hydrogenated styrene-butadiene block copolymer from Baling Petrochemical Co., Ltd., model 503T, the compatibilizer was maleic anhydride grafted SEBS from Guangdong Chuanheng Co., Ltd., nucleation site CH-909E, antioxidants included antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1, and the lubricant was polyethylene wax.

[0041] The preparation method of the above-mentioned high-temperature resistant and impact-resistant modified ABS material used in air conditioning structural products includes the following steps:

[0042] ABS resin was mixed with heat-resistant modifier, toughening agent, corrosion-resistant additive, reinforcing filler, compatibilizer, antioxidant, and lubricant. The mixture was stirred at 50°C and 500 rpm for 20 minutes and then added to the main feed hopper. Short glass fibers were added to the side feed hopper and melt-blended. The temperature range was 185°C in zone 1, 220°C in zone 2, 215°C in zone 3, 225°C in zone 4, and 235°C in zone 5, with a die temperature of 230°C and a screw speed of 150 rpm. The mixture was then extruded, pelletized, and dried at 80°C to obtain composite granules. The composite granules were injection molded and irradiated with 80 kGy.

[0043] Table 1

[0044] Raw materials / kg Example 1 Example 2 Example 3 Example 4 ABS resin 60 75 70 55 Heat-resistant modifier 18 15 20 15 Short-cut glass fiber 8 10 5 5 Corrosion-resistant additives 4 5 4 2 Reinforced packing 10 5 8 5 toughening agent 10 8 15 8 compatibilizer 5 6 3 3 antioxidants 0.8 1 0.5 0.5 lubricant 1 1.5 0.6 0.6

[0045] Examples 2-4: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products. The difference from Example 1 is that the raw material dosage is as shown in Table 1.

[0046] Example 5: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products. The difference from Example 1 is that the heat-resistant modifier includes PMMA resin, maleimide copolymer and high-polymer powder in a mass ratio of 2:1:0.5.

[0047] Example 6: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products. The difference from Example 1 is that the high-rubber powder is prepared by mixing ABS high-rubber powder and graphene at a mass ratio of 1:0.2, melting at 220°C, and granulating.

[0048] Example 7: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products. The difference from Example 6 is that the hydrophobic modified microfibrillated cellulose is polyaniline composite stearic acid modified microfibrillated cellulose, which is prepared from Preparation Example 2.

[0049] Example 8: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, differing from Example 7 in that the chopped glass fibers undergo the following pretreatment:

[0050] Short glass fibers were chemically etched and then immersed in a KH580 hydrolysate at 70°C for 50 min. After filtration, washing, and drying, pretreated fibers were obtained. The chemical etching was performed using a mixture of hydrogen peroxide and concentrated sulfuric acid in a 1:1 volume ratio, which was then immersed at 60°C for 40 min. The KH580 hydrolysate was prepared by mixing 2 mL of KH580, 1 mL of acetic acid, 10 mL of deionized water, and 90 mL of anhydrous ethanol and stirring at 70°C for 4 h.

[0051] 8 mmol of phenylphosphonic acid was dissolved in 100 mL of ethanol / water mixture (volume ratio 1:1) to prepare phenylphosphonic acid solution. 4 mmol of lanthanum chloride heptahydrate was dissolved in 75 mL of deionized water and added to the phenylphosphonic acid solution. 100 g of pretreated fiber was then added to the phenylphosphonic acid solution. The pH was adjusted to 2 with 0.1 mol / L sodium hydroxide solution. The solution was kept at 85 °C for 24 h, filtered, washed, and dried at 80 °C to constant weight.

[0052] Example 9: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, differing from Example 7 in that the chopped glass fibers undergo the following pretreatment:

[0053] Short glass fibers were chemically etched and then immersed in KH580 hydrolysate for 50 min at 70°C. The fibers were then filtered, washed, and dried. The chemical etching was performed using a mixture of hydrogen peroxide and concentrated sulfuric acid in a 1:1 volume ratio, which was then immersed at 60°C for 40 min. The KH580 hydrolysate was prepared by mixing 2 mL of KH580, 1 mL of acetic acid, 10 mL of deionized water, and 90 mL of anhydrous ethanol and stirring at 70°C for 4 h.

[0054] Example 10: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, differing from Example 7 in that the chopped glass fibers undergo the following pretreatment:

[0055] 8 mmol of phenylphosphonic acid was dissolved in 100 mL of an ethanol / water mixture (volume ratio 1:1) to prepare a phenylphosphonic acid solution. 4 mmol of lanthanum chloride heptahydrate was dissolved in 75 mL of deionized water and added to the phenylphosphonic acid solution. Then, 100 g of chopped glass fiber was added to the phenylphosphonic acid solution. The pH was adjusted to 2 with 0.1 mol / L sodium hydroxide solution. The solution was kept at 85 °C for 24 h, filtered, washed, and dried at 80 °C to constant weight.

[0056] Comparative Example

[0057] Comparative Example 1: A high-temperature resistant and impact-resistant modified ABS material used in air conditioning structural products, which differs from Example 1 in that no heat-resistant modifier is added.

[0058] Comparative Example 2: A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products. The difference from Example 1 is that the heat-resistant modifier is only a maleimide binary copolymer.

[0059] Comparative Example 3: A high-temperature resistant and impact-resistant modified ABS material used in air conditioning structural products, which differs from Example 1 in that the corrosion-resistant additive is microfibrillated cellulose.

[0060] Performance testing

[0061] Composite particles were prepared according to the methods in the examples and comparative examples. Test specimens of the composite particles were prepared by injection molding machine. The test specimens were irradiated at an irradiation dose of 80 kGy. The performance was tested according to the following methods, and the test results were recorded in Table 2.

[0062] 1. Tensile strength: Tested according to GB / T1040-2006, with a tensile rate of 50 mm / min, 5 samples per group, and the average value is taken.

[0063] 2. Impact strength: Tested according to GB / T1843-2008 standard on ZBC24B pendulum impact testing machine. The notch is 2mm and the notch radius is 0.25mm. Five samples are used in each group, and the average value is taken.

[0064] 3. Bending performance: Tested according to GB / T9341-2008, with a span of 64mm and a bending rate of 2mm / min. Five samples were used in each group, and the average value was taken.

[0065] 4. Heat distortion temperature: According to GB / T1634.1-2004, the sample size is 80mm×10mm×4mm. The sample is laid flat with a heating rate of 120℃ / h and a load of 0.45MPa. Only the average value of three samples is taken. The difference between the three test data should not exceed 5℃.

[0066] 5. Corrosion resistance: The test was conducted according to ASTM D543. The corrosive medium was xylene. The sample was continuously immersed in a constant temperature environment of 23℃ for 168 hours. The samples were weighed before and after the test to obtain the mass change rate. The result was the average of 10 parallel tests.

[0067] 6. Thermal aging performance: ABS resin is injection molded into mechanical property test strips. The test strips are placed in a 90℃ ventilated aging oven for 600 hours and then taken out to test the tensile strength. The tensile strength retention rate is calculated as (tensile strength after aging / tensile strength before aging) × 100%.

[0068] Table 2

[0069] project Tensile strength / MPa Bending strength / MPa <![CDATA[Notch impact strength kJ / m 2 > <![CDATA[-30℃ Charpy impact strength kJ / m 2 > Heat distortion temperature / ℃ Corrosion resistance quality change rate / % Tensile strength retention rate after 600 hours of aging / % Example 1 58.3 94.8 34.5 15.8 104.6 1.56 73.5 Example 2 57.6 94.2 33.8 14.6 103.8 1.61 73.1 Example 3 57.1 93.3 33.3 14.2 102.6 1.67 72.7 Example 4 56.4 92.9 32.7 13.7 103.4 1.72 72.3 Example 5 57.4 94.6 34.1 15.3 104.3 1.58 73.4 Example 6 58.8 95.3 34.9 16.3 105.8 1.47 74.1 Example 7 58.7 95.1 34.7 16.2 106.2 1.42 74.6 Example 8 59.3 95.8 35.2 16.5 107.1 1.35 75.1 Example 9 59.5 95.9 35.1 16.4 106.2 1.42 74.5 Example 10 58.9 95.3 34.8 16.3 106.9 1.37 75.0 Comparative Example 1 50.3 88.7 25.6 10.3 91.2 1.97 68.4 Comparative Example 2 51.4 89.6 26.7 11.1 97.1 1.92 70.3 Comparative Example 3 52.1 91.1 28.3 11.8 101.1 2.18 73.1

[0070] Based on the data in Table 2 and the raw material usage in Examples 1-5, it can be seen that the modified ABS material made by using ABS resin in combination with a heat-resistant modifier made of PMMA resin, maleimide copolymer and high-rubber powder, and adding short glass fiber, corrosion-resistant additives, etc., has both rigidity and toughness, strong low-temperature impact resistance, good corrosion resistance, and good barrier properties against refrigerants, lubricants, etc.

[0071] Compared with Example 1, Example 6 added a certain amount of graphene to ABS high-polymer powder. As can be seen from the data in Table 2, the modified ABS material prepared in this way has enhanced impact resistance, improved rigidity and toughness, improved impermeability, and enhanced anti-corrosion effect.

[0072] Compared to Example 6, Example 7 also uses polyaniline-stearic acid-modified microfibrillated cellulose. It can be seen that the heat distortion temperature of the modified ABS material increases and its resistance to xylene corrosion is enhanced.

[0073] Compared with Example 7, Example 8 further uses KH580 and layered lanthanum phosphonate to pretreat chopped glass fibers, thereby enhancing the corrosion resistance, increasing the heat distortion temperature, and improving the heat resistance of the modified ABS material.

[0074] In Example 9, the chopped glass fibers were pretreated only with chemical etching and KH580, while in Example 10, the chopped glass fibers were pretreated only with layered lanthanum phosphonate. It can be seen that compared with Example 7, the modified ABS material prepared in Example 9 has higher mechanical properties, but its heat resistance and barrier properties are worse. In Example 10, the material has better heat resistance and barrier properties, but its mechanical properties are worse.

[0075] Compared with Example 1, no heat-resistant modifier was added to the modified ABS material in Comparative Example 1. As can be seen from the data in Table 2, the modified ABS material obtained in Comparative Example 1 not only has a reduced mechanical strength, but also a reduced heat distortion temperature and a reduced barrier ability against corrosive media.

[0076] Compared with Example 1, Comparative Example 2 only used maleimide binary copolymer as heat-resistant modifier. The modified ABS material prepared in Comparative Example 2 had reduced heat resistance and weakened corrosion resistance compared with Example 1.

[0077] Compared with Example 1, Comparative Example 3 used microfibrillated cellulose as a corrosion-resistant additive. The data in Table 2 show that the modified ABS material prepared in Comparative Example 3 has reduced mechanical strength and weakened barrier properties.

[0078] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products, characterized in that, By weight, it includes the following ingredients: The composition includes 55-75 parts ABS resin, 15-20 parts heat-resistant modifier, 5-10 parts chopped glass fiber, 2-5 parts corrosion-resistant additive, 5-10 parts reinforcing filler, 8-15 parts toughening agent, 3-6 parts compatibilizer, 0.5-1 part antioxidant, and 0.6-1.5 parts lubricant. The heat-resistant modifier comprises PMMA resin, maleimide copolymer, and high-resin powder in a mass ratio of 2:1-1.5:0.5-1.

2. The high-temperature resistant and impact-resistant modified ABS material for air conditioning structural products according to claim 1, characterized in that: The chopped glass fibers undergo the following pretreatment: Short glass fibers were chemically etched and then immersed in KH580 hydrolysate. They were soaked at 70°C for 30-50 minutes, filtered, washed, and dried to obtain pretreated fibers. Phenylated phosphoric acid was added to an ethanol / water mixture, followed by lanthanum chloride heptahydrate solution and pretreated fibers. The pH was adjusted to 2, the temperature was raised to 85-100℃, and the mixture was kept at that temperature for 20-24 hours. The mixture was then filtered, washed, and dried to constant weight.

3. The high-temperature resistant and impact-resistant modified ABS material for air conditioning structural products according to claim 1, characterized in that: The corrosion-resistant additive is hydrophobically modified microfibrillated cellulose.

4. The high-temperature resistant and impact-resistant modified ABS material for air conditioning structural products according to claim 3, characterized in that: The hydrophobically modified microfibrillated cellulose is polyaniline-stearic acid-modified microfibrillated cellulose.

5. The high-temperature resistant and impact-resistant modified ABS material for air conditioning structural products according to claim 1, characterized in that: The high-polymer powder is prepared by mixing and granulating ABS high-polymer powder and graphene in a mass ratio of 1:0.1-0.

2.

6. The high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products according to claim 1, characterized in that: The reinforcing filler is selected from at least one of montmorillonite, mica, graphene, talc, and silica.

7. The high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products according to claim 1, characterized in that: The toughening agent is selected from at least one of hydrogenated styrene-butadiene block copolymer, polyolefin elastomer propylene-based elastomer, and maleic anhydride-grafted polyethylene.

8. The high-temperature resistant and impact-resistant modified ABS material for air conditioning structural products according to claim 1, characterized in that: The compatibilizer is selected from at least one of maleic anhydride-grafted PE, maleic anhydride-grafted PP, and maleic anhydride-grafted SEBS.

9. The high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products according to claim 1, characterized in that: The antioxidant is selected from at least one of antioxidant 1076, antioxidant 1010, antioxidant 126 and antioxidant 1680.

10. The method for preparing the high-temperature resistant and impact-resistant modified ABS material for use in air conditioning structural products according to any one of claims 1-9, characterized in that, Includes the following steps: ABS resin is mixed with heat-resistant modifier, toughening agent, corrosion-resistant additive, reinforcing filler, compatibilizer, antioxidant, and lubricant, and added to the main feed hopper. Short glass fibers are added to the side feed hopper. The mixture is then extruded and granulated to obtain composite granules. The composite granules are injection molded and irradiated with 60-80 kGy.