Composite recycled material for air conditioner housing and preparation method thereof
By adding zinc dimethacrylate, an aging repair agent, and modified SBS to recycled ABS material to form a cross-linked structure, and by adding nanocellulose, the problem of performance degradation of recycled ABS plastic was solved, the mechanical properties and gloss of air conditioner casings were improved, and environmentally friendly and economical composite recycled material preparation was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUNAN DENGKE MATERIAL TECH CO LTD
- Filing Date
- 2026-04-13
- Publication Date
- 2026-05-29
AI Technical Summary
Existing recycled ABS plastics experience performance degradation during the recycling process, especially in terms of impact and tensile strength, and have poor surface gloss, making it difficult to meet the aesthetic and durability requirements of air conditioner casings.
By blending aging repair agent zinc dimethacrylate and modified SBS (containing borate ester bonds) with recycled ABS material, the mechanical properties and gloss of the material are improved by forming a cross-linked structure of nanoscale polymer particles and combining it with a nanocellulose reinforcing phase.
It significantly improves the mechanical properties and gloss of recycled ABS plastic, meeting the requirements for air conditioner housings and achieving a balance between performance, environmental protection, and economy.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of recycled materials technology, specifically relating to a composite recycled material for air conditioner casings and its preparation method. Background Technology
[0002] With the rapid development of the home appliance industry, the amount of casing material used in air conditioners, which are a widely used home appliance, has been increasing year by year. Traditional air conditioner casings are mostly made of ABS (acrylonitrile-butadiene-styrene copolymer). ABS has excellent mechanical properties, good processing fluidity and surface gloss. When used as an air conditioner casing, it not only has good impact resistance and rigidity but is also beautiful and lightweight, making it an ideal choice for air conditioner casings.
[0003] However, virgin ABS relies on petroleum resources, resulting in high carbon emissions during production. The accumulation of waste air conditioner casings also puts pressure on the ecological environment. Furthermore, with the increasing global emphasis on sustainable development and the circular economy, the application of recycled materials in plastic products is becoming more and more widespread. Therefore, developing environmentally friendly composite materials based on recycled ABS has become an important research direction.
[0004] However, the recycling of recycled ABS plastic still faces challenges. These include a significant decrease in impact and tensile strength due to repeated processing, yellowing caused by thermo-oxidative stress, reduced surface gloss, and difficulty meeting the aesthetic requirements of air conditioner casings. Impurities in the recycled material can lead to wear on processing equipment, and the melt flow fluctuates greatly, resulting in low yield. Existing technologies often employ simple blending with virgin materials or adding a low proportion of fillers to further improve the performance of recycled ABS. However, these methods also have limitations. For example, to achieve good performance, the blending ratio of virgin materials must be increased, significantly reducing environmental and economic benefits. While inorganic fillers can improve rigidity, they exacerbate material brittleness and increase the surface roughness of the resulting recycled material, making it unsuitable for air conditioner casing applications. Therefore, developing an ABS-based composite recycled material for air conditioner casings that balances performance, environmental friendliness, and economy is of great significance for promoting the green transformation of the home appliance industry. Summary of the Invention
[0005] The purpose of this invention is to provide a composite recycled material for air conditioner housings and its preparation method, so as to solve the problems of performance degradation and low gloss of recycled ABS materials.
[0006] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a composite recycled material for air conditioner housings, comprising the following raw materials in parts by weight: 70-90 parts of recycled ABS material; 10-30 parts of virgin ABS material; Antioxidant 0.5 to 2 parts; 4-8 parts of aging repair agent; Peroxide 0.5 to 1 part; 3-5 parts of modified SBS; The aging repair agent is zinc dimethacrylate; the molecular chain of the modified SBS contains borate ester bonds.
[0007] Preferably, the recycled ABS material is unbleached ABS fragments obtained through sorting, crushing, washing and drying; the diameter of the recycled ABS material is 5-15 mm.
[0008] Preferably, the peroxide includes one or more combinations of dicumyl peroxide, benzoyl peroxide, and dibenzoyl peroxide.
[0009] Preferably, the antioxidant includes one or more combinations of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1098, antioxidant 1035, antioxidant 697 and antioxidant DLTP.
[0010] By adopting the above technical solution, the composite recycled material for air conditioner shells obtained by the present invention utilizes a large amount of ABS recycled material. However, since the ABS recycled material has undergone multiple melting processes during recycling, the high-temperature environment will cause the main chain or side chain of ABS recycled material to break. In particular, high shear force and high temperature will cause the butadiene rubber phase in the ABS recycled material to crosslink or decompose, directly affecting the impact resistance and tensile strength of the material, destroying its toughening effect, and causing the material to become brittle. Furthermore, due to the participation of oxygen during processing, oxidative degradation will be triggered, forming weak bonds such as carbonyl groups, which will further reduce the molecular weight of ABS and make the material brittle.
[0011] Therefore, in order to further improve the performance of recycled ABS, in addition to blending in some virgin material, an aging repair agent is also added. Specifically, the aging repair agent is zinc dimethacrylate. Peroxides can help decompose and generate free radicals during processing. Free radicals can initiate the polymerization of zinc dimethacrylate. Under its catalytic action, nanoscale polymer particles are gradually formed. These particles can be distributed in the molecular chains of recycled ABS and can act as crosslinking points to react with the broken molecular chains in recycled ABS, forming a stable crosslinked structure. This crosslinking method can effectively restore the broken points of the molecular chains of recycled ABS, allowing the molecular chains to reconnect and the molecular chain structure to become more complete, thereby enhancing the mechanical properties and thermal stability of recycled ABS.
[0012] Furthermore, zinc ions in zinc dimethacrylate can promote the formation of ion clusters through electrostatic attraction during the processing of recycled ABS materials, forming an ion cross-linking network, thereby enhancing the impact resistance of the material and compensating for the performance degradation of ABS due to recycling.
[0013] However, under the action of peroxides, the polymer particles formed by the aging repair agent tend to aggregate. Moreover, due to the large polarity difference between the agent and the ABS matrix, the dispersibility of zinc dimethacrylate in the system is severely affected. Decreased dispersibility leads to a decrease in the stability of the cross-linked network, which is not conducive to improving material performance and thus weakens the reinforcing effect on the composite recycled material. Furthermore, the cross-linked network structure formed with the ABS molecular chains leads to a decrease in the dynamics of the ABS molecular chain segments, which not only results in a lack of significant improvement in impact resistance but also affects dispersibility. Therefore, in order to improve the dispersibility of the aging repair agent in the material, modified SBS is added to the raw materials of the composite recycled material.
[0014] On the one hand, because the original structure of ABS recycled material is damaged, it has high viscosity and amorphous structure, which will lead to poor dispersion of aging repair agents in the matrix. On the other hand, SBS (styrene-butadiene-styrene triblock copolymer), as a thermoplastic elastic modifier, can not only improve the impact resistance of ABS recycled material to a certain extent, but also enhance the compatibility of ABS recycled material, reduce the aggregation of rubber phase in the system, and help improve the dispersion ability of ABS recycled material.
[0015] On the other hand, SBS, as a compatibilizer, can reduce the interfacial tension between zinc dimethacrylate and ABS, thereby reducing the aggregation tendency of zinc dimethacrylate polymer particles in the system and improving the dispersibility of the aging repair agent in the system. Furthermore, the modified SBS of this invention also contains borate ester bonds, which can form a strong interaction with the ionic groups in zinc dimethacrylate. This not only promotes the uniform distribution of zinc dimethacrylate in the ABS matrix, but its dynamic covalent structure can also optimize the crosslinking network between zinc dimethacrylate and ABS. This not only promotes the formation of the crosslinking network in the system and better repairs the broken molecular chains of the recycled ABS material, but also improves the dispersibility of zinc dimethacrylate in the system, thus better improving the mechanical properties of the obtained composite recycled material.
[0016] Preferably, the raw materials for modified SBS include a mercapto-modified phenylboronic acid crosslinking agent and SBS in a mass ratio of (0.05 to 0.07):1.
[0017] Preferably, the modified SBS is prepared according to the following method: Preparation of thiolized phenylboronic acid crosslinking agent: phenylboronic acid and 3-mercapto-1,2-propanediol were added to a solvent, stirred and dissolved, a dehydrating agent was added, and the reaction was carried out at 30-40℃ for 20-24 h. Then, the thiolized phenylboronic acid crosslinking agent was obtained by filtration, concentration, washing and drying. Preparation of modified SBS: SBS was dissolved in a solvent, a catalyst and a mercaptophenylboronic acid crosslinking agent were added, the mixture was stirred and dissolved, the solvent was evaporated, and the mixture was irradiated with ultraviolet light for 20-30 min to obtain modified SBS.
[0018] Preferably, phenylboronic acid includes one or a combination of two of 1,4-phenyldiboronic acid and 4,4-biphenyldiboronic acid.
[0019] Preferably, the mass ratio of phenylboronic acid to 3-mercapto-1,2-propanediol is 1:(1.15 to 1.3).
[0020] Preferably, the solvent includes one or more combinations of tetrahydrofuran, acetone and toluene.
[0021] Preferably, the dehydrating agent includes one or more combinations of anhydrous magnesium sulfate, anhydrous sodium sulfate, calcium chloride, and calcium sulfate.
[0022] Preferably, the catalyst comprises one or more combinations of dimethylolpropionic acid, 2,2-dimethoxy-2-phenylacetophenone and 2-hydroxy-2-methyl-1-phenyl-1-propanone.
[0023] By employing the above technical solution, the thiolized phenylboronic acid crosslinking agent can undergo a thiol-olefin click reaction with SBS under the action of a catalyst, thereby introducing borate ester dynamic crosslinking bonds into the SBS molecular chain. The modified SBS not only retains its original function of improving the interfacial compatibility between the ABS matrix and the aging repair agent, but the contained borate ester dynamic crosslinking bonds can also optimize the ionic crosslinking network formed by the aging repair agent, significantly improving the impact resistance of the composite recycled material.
[0024] Preferably, the raw materials for the composite recycled material also include 4 to 6 parts by weight of a nano-reinforcing phase.
[0025] Preferably, the nano-reinforcing phase is nanocellulose; the length of the nanocellulose is 0.5-3 μm and the diameter is 10-50 nm.
[0026] By adopting the above technical solutions, in addition to the decrease in mechanical properties such as impact resistance due to the breakage of the main chain or side chain and the excessive decomposition of the rubber phase, ABS recycled materials will also discolor due to the action of high temperature and oxygen. Multiple melting and processing will also lead to surface roughening of the resulting composite recycled material, increased light scattering, and decreased gloss of the material. When used in air conditioner casings, the aesthetics will be reduced, and the possibility of small molecule compounds in the system will also increase, forming a hazy appearance, which will greatly affect the aesthetics when used as an air conditioner casing.
[0027] Therefore, in addition to the original raw materials, a nano-reinforcing phase can be added. Specifically, the nano-reinforcing phase is nanocellulose. On the one hand, the addition of nanocellulose can fill the microscopic defects and pores on the surface of ABS composite recycled material, thereby significantly reducing surface roughness. The improvement of surface smoothness can directly reduce light scattering, thereby improving the gloss of the air conditioner shell.
[0028] On the other hand, when nanocellulose is dispersed in an ABS matrix, the numerous polar hydroxyl groups it contains can form hydrogen bonds or physical entanglements with the polar groups in recycled ABS material. It can also form an effective interface with the aging repair agent, resulting in a denser network structure. Modified SBS also helps nanocellulose disperse in the ABS matrix, reducing interfacial porosity and inhomogeneity, strengthening interfacial bonding, and further enhancing surface smoothness. Moreover, after the aging repair agent reconnects the broken molecular chains of the recycled ABS material, it can better reduce defects and irregularities between molecules in the ABS matrix material, thus synergistically helping nanocellulose restore the gloss of the ABS material surface.
[0029] Furthermore, the unique structure of nanocellulose can effectively withstand external stress through load transfer mechanisms, thereby significantly improving the mechanical strength of the resulting composite recycled material. Due to its high aspect ratio, nanocellulose more easily forms an entangled three-dimensional network within the ABS matrix, thus enhancing the rigidity and resistance to deformation of the composite recycled material. Simultaneously, it can act as a barrier to the propagation of microcracks, consuming accumulated internal energy, thus reducing the material's fracture resistance and extending its service life.
[0030] Secondly, this aspect provides a method for preparing a composite recycled material for air conditioner housings, comprising the following process steps: S1. Weigh the raw materials according to the corresponding mass fractions; S2. After uniformly mixing the raw materials, a premix is obtained; the premix is melt-plasticized and extruded into granulation to obtain a composite recycled material for air conditioner casings.
[0031] Preferably, the melt plasticizing temperature is 150–190°C.
[0032] Preferably, the desired technical effect of the present invention can be achieved even without adding a nano-reinforcing phase to the raw materials in step S2.
[0033] The beneficial effects of this invention are: 1. The composite recycled material of this invention contains an aging repair agent, specifically zinc dimethacrylate. Zinc dimethacrylate can gradually form nanoscale polymer particles under the action of peroxides. These particles can act as crosslinking points, reacting with broken molecular chains in the ABS recycled material to form a stable crosslinked structure. This crosslinking method can effectively restore the broken points of the ABS recycled material molecular chains, allowing the molecular chains to reconnect, improving the molecular structure of the ABS matrix, and enhancing the mechanical properties of the material. Furthermore, modified SBS is added, which can significantly improve the dispersion ability of the aging repair agent in the matrix and reduce the aggregation of the rubber phase in the system. Simultaneously, the borate ester bonds in the modified SBS, acting as dynamic covalent bonds, can further optimize the crosslinking structure, thereby further improving the mechanical properties of the resulting composite recycled material.
[0034] 2. The composite recycled material of the present invention can also be reinforced with a nano-reinforcing phase, specifically nanocellulose, which can work synergistically with aging repair agents to greatly improve the surface smoothness of the material, enhance the gloss of the material, and further improve the rigidity and resistance to deformation of the composite recycled material. Detailed Implementation
[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0036] Preparation Example Preparation Example 1: A modified SBS was prepared according to the following method: 10g of 1,4-phenylboronic acid and 12g of 3-mercapto-1,2-propanediol were added to 250mL of tetrahydrofuran and stirred to dissolve. Then, 10g of anhydrous magnesium sulfate was added and the mixture was reacted at 30℃ for 24h. The mixture was then filtered, concentrated, washed and dried to obtain the mercapto-phenylboronic acid crosslinking agent. 100g of SBS was dissolved in 500mL of tetrahydrofuran, and 0.5g of dimethylolpropionic acid and 6g of the above-obtained mercaptophenylboronic acid crosslinking agent were added. After stirring and dissolving, the solvent was evaporated, and the mixture was irradiated with ultraviolet light for 25min to obtain modified SBS.
[0037] Preparation Example 2, a modified SBS, differs from Preparation Example 1 only in that the amount of 3-mercapto-1,2-propanediol added is 11.5 g; and the amount of mercapto-phenylboronic acid crosslinking agent added is 5 g.
[0038] Preparation Example 3, a modified SBS, differs from Preparation Example 1 only in that the amount of 3-mercapto-1,2-propanediol added is 13g; and the amount of thiolated phenylboronic acid crosslinking agent added is 7g.
[0039] Preparation Example 4, a modified SBS, differs from Preparation Example 1 only in that the amount of thiolized phenylboronic acid crosslinking agent added is 4g.
[0040] Preparation Example 5, a modified SBS, differs from Preparation Example 1 only in that the amount of thiolized phenylboronic acid crosslinking agent added is 8g.
[0041] Example Example 1: A composite recycled material for air conditioner housings is prepared according to the following process steps: S1. Weigh 8 kg of recycled ABS material (unbleached ABS fragments obtained after sorting, crushing, washing and drying; the average diameter of the recycled ABS material is 10 mm), 2 kg of virgin ABS material, 0.1 kg of antioxidant 1010, 0.6 kg of zinc dimethacrylate, 0.08 kg of dicumyl peroxide and 0.4 kg of the modified SBS prepared in Preparation Example 1; S2. The above raw materials are mixed evenly to obtain a premix; the premix is melt-plasticized and extruded and granulated to obtain a composite recycled material for air conditioner housing, wherein the melt-plasticization temperature is 160-180℃.
[0042] Examples 2 to 5 describe a composite recycled material for air conditioner housings, differing from Example 1 only in the adjustment of the raw material ratio, as shown in Table 1: Table 1. Formulation Tables for Examples 1 to 5
[0043] In this case, the modified SBS in Examples 1 to 5 were all the modified SBS prepared in Example 1.
[0044] Example 6: A composite recycled material for air conditioner housings, differing from Example 1 only in that an equal amount of modified SBS prepared in Example 2 is used to replace the modified SBS prepared in Example 1.
[0045] Example 7: A composite recycled material for air conditioner housings, differing from Example 1 only in that an equal amount of modified SBS prepared in Example 3 is used to replace the modified SBS prepared in Example 1.
[0046] Example 8, a composite recycled material for air conditioner housing, differs from Example 1 only in that the modified SBS prepared in Example 1 is replaced with an equal amount of modified SBS prepared in Example 4.
[0047] Example 9, a composite recycled material for air conditioner housing, differs from Example 1 only in that the modified SBS prepared in Example 1 is replaced with an equal amount of modified SBS prepared in Example 5.
[0048] Example 10: A composite recycled material for air conditioner housings, differing from Example 1 only in that 0.5 kg of nanocellulose (with an average length of 2 μm and an average diameter of 20 nm) is added to the premix.
[0049] Example 11, a composite recycled material for air conditioner casing, differs from Example 10 only in that the amount of nanocellulose added is 0.4 kg.
[0050] Example 12, a composite recycled material for air conditioner casing, differs from Example 10 only in that the amount of nanocellulose added is 0.6 kg.
[0051] Example 13, a composite recycled material for air conditioner casing, differs from Example 10 only in that the amount of nanocellulose added is 0.2 kg.
[0052] Example 14, a composite recycled material for air conditioner casing, differs from Example 10 only in that the amount of nanocellulose added is 0.8 kg.
[0053] Comparative Example Comparative Example 1 is a composite recycled material for air conditioner housings, which differs from Example 1 only in that the amount of zinc dimethacrylate added is 0.2 kg.
[0054] Comparative Example 2, a composite recycled material for air conditioner housings, differs from Example 1 only in that the amount of zinc dimethacrylate added is 1 kg.
[0055] Comparative Example 3 is a composite recycled material for air conditioner housings, which differs from Example 1 only in that the amount of modified SBS added in Preparation Example 1 is 0.1 kg.
[0056] Comparative Example 4, a composite recycled material for air conditioner housing, differs from Example 1 only in that the amount of modified SBS added in Preparation Example 1 is 0.7 kg.
[0057] Comparative Example 5 is a composite recycled material for air conditioner housings, which differs from Example 1 only in that it does not contain dicumyl peroxide.
[0058] Comparative Example 6 is a composite recycled material for air conditioner housings, which differs from Example 1 only in that the modified SBS prepared in Example 1 is not added.
[0059] Comparative Example 7 is a composite recycled material for air conditioner housings, which differs from Example 1 only in that it does not contain zinc dimethacrylate.
[0060] Performance testing 1. Mechanical property testing: (1) Tensile property test: According to the relevant records in GB / T 1040.1-2018 "Determination of tensile properties of plastics - Part 1: General Rules", the tensile strength of the composite recycled materials obtained in the examples and comparative examples was tested. (2) Impact performance test: According to the relevant records in GB / T 1043.1-2008 "Determination of impact performance of simply supported plastic beams - Part 1: Non-instrumental impact test", the notched impact strength of the composite recycled materials obtained in the examples and comparative examples was tested; The results of the above experiments are shown in Table 2.
[0061] 2. Gloss performance test: According to the relevant records in ASTM D523-2014 "Standard Test Method for Specular Gloss", the surface gloss of the composite recycled materials obtained in the test examples and comparative examples was measured at a 20° angle. The results of the above experiments are shown in Table 3.
[0062] Table 2 Mechanical Performance Test Results
[0063] Table 3. Gloss Performance Test Results
[0064] According to Tables 2 and 3, and in conjunction with Examples 1, 8, and 9, it can be seen that the tensile strength and notched impact strength of Examples 8 and 9 are lower than those of Example 1, and the surface gloss is slightly lower. This indicates that the mechanical properties and gloss of Examples 8 and 9 are lower than those of Example 1. The reason for this is that the only difference between Examples 8 and 9 and Example 1 is that the amount of thiolized phenylboronic acid crosslinking agent added was adjusted during the preparation process of the modified SBS. In Example 8, the amount of thiolized phenylboronic acid crosslinking agent added was reduced, resulting in a decrease in the content of borate ester bonds in the molecular chain of the modified SBS. This reduces the effect on improving the dispersibility of the aging repair agent in the composite recycled material and the optimization effect on the formed crosslinking network, thus leading to a decrease in the mechanical properties of the material, a decrease in the improvement of internal defects and irregular structures, and a corresponding decrease in gloss. In Example 9, the amount of thiolized phenylboronic acid crosslinking agent added was increased, which significantly increased the intermolecular interaction force. This, in turn, caused the modified SBS and the aging repair agent to agglomerate in the ABS matrix, resulting in a decrease in the impact resistance of the material.
[0065] Combining Examples 1, 10, 13, and 14, it can be seen that Example 10 shows improved performance compared to Example 1, with a significant increase in surface gloss. This is because Example 10 also includes nanocellulose, which can significantly reduce the surface roughness of the material and, in conjunction with the aging repair agent, reduce defects and irregularities between molecules in the recycled ABS material, thereby improving the surface gloss. Examples 13 and 14 show decreased performance compared to Example 10. This is because the amount of nanocellulose added in Examples 13 and 14 was adjusted. Example 13 reduced the amount of nanocellulose added, resulting in a decrease in the reinforcing effect of nanocellulose. Example 14 increased the amount of nanocellulose added; excessive nano-reinforcing phase can lead to uneven stress distribution within the material, which in turn causes a decrease in the material's mechanical properties.
[0066] Based on Examples 1, 1, 2, and 7, it can be seen that the performance of Comparative Examples 1, 2, and 7 is lower than that of Example 1. This is because the amount of aging repair agent added in Comparative Examples 1, 2, and 7 was adjusted. When the amount added is reduced, the cross-linking repair effect on the broken molecular chains of the recycled ABS material decreases, resulting in a significant decrease in the material's mechanical properties. In Comparative Example 7, no aging repair agent was added, leading to a more pronounced performance decline. Increasing the amount added increases the probability of agglomeration, and an excessively high cross-linking network density leads to increased material rigidity and decreased impact resistance.
[0067] Based on Examples 1, 3, 4, and 6, it can be seen that the performance of Comparative Examples 3, 4, and 6 is lower than that of Example 1. This is because the amount of modified SBS added in Comparative Examples 3, 4, and 6 was adjusted compared to Example 1. A reduced amount of modified SBS reduces the enhancement effect on material dispersibility and compatibility, resulting in a decrease in material performance. In Comparative Example 6, no modified SBS was added, leading to a more significant performance decrease. Comparative Example 4 increased the amount of modified SBS added. Excessive SBS addition disrupts the original interfacial bonding, causing phase separation and a decrease in mechanical properties. Furthermore, excessive addition of borate ester bonds also leads to an overly dense cross-linked network, reducing the material's impact resistance.
[0068] Combining Example 1 and Comparative Example 5, it can be seen that the performance of Comparative Example 5 is lower than that of Example 1. The reason is that no peroxide was added in Comparative Example 5, so the polymerization effect of the aging repair agent was greatly weakened, the effect of forming a cross-linked network was weakened, the repair effect on the molecular chain of the ABS recycled material was reduced, and the performance of the material decreased accordingly.
[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A composite recycled material for air conditioner housings, characterized in that, The raw materials include the following parts by weight: 70-90 parts of recycled ABS material; 10-30 parts of virgin ABS material; Antioxidant 0.5 to 2 parts; 4-8 parts of aging repair agent; Peroxide 0.5 to 1 part; 3-5 parts of modified SBS; The aging repair agent is zinc dimethacrylate; the molecular chain of the modified SBS contains borate ester bonds.
2. The composite recycled material for air conditioner housings according to claim 1, characterized in that, The peroxide includes one or more combinations of dicumyl peroxide, benzoyl peroxide, and dibenzoyl peroxide.
3. The composite recycled material for air conditioner housings according to claim 1, characterized in that, The raw materials for the modified SBS include a mercapto-modified phenylboronic acid crosslinking agent and SBS in a mass ratio of (0.05 to 0.07):
1.
4. The composite recycled material for air conditioner housings according to claim 1, characterized in that, The modified SBS was prepared according to the following method: Preparation of thiolized phenylboronic acid crosslinking agent: phenylboronic acid and 3-mercapto-1,2-propanediol were added to a solvent, stirred and dissolved, a dehydrating agent was added, and the reaction was carried out at 30-40℃ for 20-24 h. Then, the thiolized phenylboronic acid crosslinking agent was obtained by filtration, concentration, washing and drying. Preparation of modified SBS: SBS was dissolved in a solvent, a catalyst and a mercaptophenylboronic acid crosslinking agent were added, the mixture was stirred and dissolved, the solvent was evaporated, and the mixture was irradiated with ultraviolet light for 20-30 min to obtain modified SBS.
5. The composite recycled material for air conditioner housings according to claim 4, characterized in that, The phenylboronic acid includes one or a combination of two of 1,4-phenyldiboronic acid and 4,4-biphenyldiboronic acid.
6. The composite recycled material for air conditioner housings according to claim 4, characterized in that, The mass ratio of phenylboronic acid to 3-mercapto-1,2-propanediol is 1:(1.15 to 1.3).
7. The composite recycled material for air conditioner housings according to claim 1, characterized in that, The raw materials of the composite recycled material also include 4 to 6 parts by weight of nano-reinforcing phase.
8. The composite recycled material for air conditioner housings according to claim 7, characterized in that, The nano-reinforcing phase is nanocellulose; the length of the nanocellulose is 0.5-3 μm and the diameter is 10-50 nm.
9. The composite recycled material for air conditioner housings according to claim 1, characterized in that, The recycled ABS material is unbleached ABS fragments obtained through sorting, crushing, washing and drying; the diameter of the recycled ABS material is 5-15 mm.
10. A method for preparing a composite recycled material for an air conditioner casing according to any one of claims 1 to 9, characterized in that, The process includes the following steps: S1. Weigh the raw materials according to the corresponding mass fractions; S2. After uniformly mixing the raw materials, a premix is obtained; the premix is melt-plasticized and extruded into granulation to obtain a composite recycled material for air conditioner casings.