An ABS composite plastic material and its preparation method
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGGUAN DINGSHENG NEW MATERIALS CO LTD
- Filing Date
- 2026-05-18
- Publication Date
- 2026-06-30
Smart Images
Figure CN122302479A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of plastic materials technology, and more specifically, to an ABS composite plastic material and its preparation method. Background Technology
[0002] ABS resin is widely used in electronics, automotive parts, office equipment, and smart home applications due to its excellent rigidity, toughness, processing fluidity, and comprehensive mechanical properties. However, ordinary ABS resin has drawbacks such as low heat resistance, susceptibility to breakage under low temperature or high-speed impact, and susceptibility to aging and deformation after long-term use, making it difficult to meet the stringent requirements of high-temperature conditions, outdoor durability, and high-impact structural components.
[0003] As downstream industries continue to raise their performance requirements for plastic materials, traditional ABS materials can no longer meet the demands for synergistic improvement in heat resistance and impact resistance in scenarios such as lightweight automotive components, electrical appliance housings, and high-end structural parts. Currently, the industry commonly uses methods such as glass fiber reinforcement, elastomer toughening, and heat-resistant monomer copolymerization to modify ABS, but these methods generally suffer from the following technical pain points: While glass fiber reinforcement can effectively improve the rigidity and heat resistance of ABS, it reduces the material's impact toughness. The interfacial bonding between ordinary round glass fibers and the ABS matrix is weak, which easily leads to stress concentration under stress, causing fiber / matrix interface debonding and the material to change from ductile fracture to brittle fracture. In addition, the poor compatibility between glass fibers and the ABS matrix makes the fibers easily exposed during molding, which not only affects the appearance of the product but also weakens the reinforcement effect. To solve the problem of fiber floating, Chinese patent CN112724586A attempted to achieve low fiber floating by adding specific types of PBAT and working synergistically with compatibilizers, lubricants, and coupling agents. However, this solution involves multiple additives, resulting in high costs and the difficulty in procuring some raw materials, thus limiting its market promotion.
[0004] Moreover, while conventional elastomer toughening can improve the impact resistance of ABS, it significantly reduces the material's heat resistance and dimensional stability, making it prone to softening and creep at high temperatures. How to maintain or even improve the material's heat resistance while enhancing its toughness has been a long-standing technical challenge for the industry. Jiangsu Shangai New Material Technology Co., Ltd.'s patent application (publication number CN121851564A) addresses the application scenario of automotive USB interface shells, pointing out the technical contradiction between "improved heat resistance and decreased toughness" in ABS materials. By compounding SAN resin, ABS high-resin powder, and heat-resistant agents, the Vicat softening temperature reaches 107-115℃, and the notched impact strength reaches over 10.5 kJ / m². Although this solution balances heat resistance and impact resistance to a certain extent, the absolute value of the impact strength is still relatively low, making it difficult to meet the requirements for high-impact structural components.
[0005] Furthermore, there is an inherent contradiction between the reinforcement and toughening modification of ABS in the existing technology. Reinforcement often comes at the cost of toughness, while toughening often leads to a decrease in heat resistance and rigidity. To solve this problem, some studies have attempted to adopt composite modification strategies. For example, Chinese patent CN201010276246.3 discloses a heat-resistant and impact-resistant glass fiber reinforced ABS modified plastic, which improves the rigidity-toughness balance to a certain extent by adding heat-resistant multi-unit random copolymers and silicone acrylic impact modifiers. However, this solution still uses circular cross-section glass fibers, and the interfacial bonding strength between the fibers and the matrix is limited. How to invent an ABS composite plastic material and its preparation method to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention
[0006] To overcome the above shortcomings, this invention provides an ABS composite plastic material and its preparation method, aiming to solve the problems of existing solutions involving multiple additives, high cost, difficulty in procuring some raw materials, limited market promotion, and the fact that while heat resistance and impact resistance are taken into account to a certain extent, the absolute value of impact strength is still low, making it difficult to meet the requirements of high-impact structural components and difficult to achieve low-cost large-scale production.
[0007] This invention is implemented as follows:
[0008] This invention provides an ABS composite plastic material, which, by weight, is composed of the following components:
[0009] 55-65 parts of ABS resin
[0010] 12-18 parts of composite modified flat cross-section glass fiber
[0011] MBS-type core-shell structure impact modifier, 8-12 parts.
[0012] Maleic anhydride-grafted ABS 4-6 parts
[0013] 1-2 parts lubricant
[0014] Antioxidant 0.5-1 part
[0015] 0.5-1.5 parts of pretreated nano-silica with acidification;
[0016] The composite modified flat cross-section glass fiber is a flat cross-section glass fiber modified by composite modification of γ-aminopropyltriethoxysilane and dimethylhydroxy silicone oil, wherein the weight ratio of γ-aminopropyltriethoxysilane to dimethylhydroxy silicone oil is 1:0.5-1:2;
[0017] The weight ratio of the composite modified flat cross-section glass fiber to the MBS-type core-shell structure impact modifier is 1.2:1-1.8:1;
[0018] The weight ratio of the acidified pretreated nano-silica to the composite modified flat cross-section glass fiber is 1:10-1:24.
[0019] Preferably, the flatness of the flat cross-section glass fiber is 2:1-5:1, and the aspect ratio is 30-60.
[0020] Preferably, the total amount of γ-aminopropyltriethoxysilane and dimethylhydroxysilicone oil is 1.0%-2.0% of the weight of the flat cross-section glass fiber.
[0021] Preferably, the core layer of the MBS-type core-shell structure impact modifier is a polybutadiene elastomer, the shell layer is a methyl methacrylate-styrene copolymer, the weight ratio of the core layer to the shell layer is 6:4-7:3, and the average particle size is 0.1-0.5μm.
[0022] Preferably, the grafting rate of the maleic anhydride-grafted ABS is 0.5%-1.0%.
[0023] Preferably, the average particle size of the acidified pretreated nano-silica is 10-50 nm, and the specific surface area is 150-300 m² / g.
[0024] Preferably, the lubricant is selected from at least one of calcium stearate, zinc stearate, polyethylene wax, and ethylene bis-stearamide.
[0025] Preferably, the antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a weight ratio of 1:1 to 2:1.
[0026] Preferably, the acidified pretreated nano-silica is nano-silica obtained by ultrasonic dispersion, filtration, washing and drying in an acid solution with a pH of 3-5.
[0027] A method for preparing the ABS composite plastic material includes the following steps:
[0028] S1: Place nano-silica in an acidic solution with pH 3-5 and ultrasonically disperse for 20-40 min. Filter, wash and dry to obtain acidified pretreated nano-silica.
[0029] S2: Flat cross-section glass fibers are dispersed in sodium hydroxide alkaline solution with pH 8-9, filtered and dried, and then a mixed solution of γ-aminopropyltriethoxysilane and dimethyl hydroxy silicone oil is added for composite modification treatment. After drying, composite modified flat cross-section glass fibers are obtained.
[0030] S3: ABS resin, MBS-type core-shell structure impact modifier, maleic anhydride grafted ABS, lubricant, antioxidant and acidified pretreated nano-silica obtained in S1 are added to a high-speed mixer and mixed evenly to obtain a premix.
[0031] S4: The premixed material obtained in S3 is added through the main feed port of the twin-screw extruder, and the composite modified flat cross-section glass fiber obtained in S2 is added through the side feed port. After melt blending, extrusion, cooling and granulation, the ABS composite plastic material is obtained.
[0032] The beneficial effects of this invention are:
[0033] 1. This invention uses composite modified flat cross-section glass fiber as a heat-resistant reinforcing phase. The flat cross-section glass fiber has a high contact area and mechanical locking effect, which can reduce the tendency of the fiber to slip and rotate in the matrix. γ-aminopropyltriethoxysilane can form a chemical bridge between the glass fiber and the ABS matrix, and dimethyl hydroxy silicone oil can form a flexible interface layer and improve dispersibility. The combination of the two achieves a synergistic interface structure of "chemical anchoring + flexible buffering".
[0034] 2. This invention uses MBS-type core-shell structure impact modifier and controls the weight ratio of composite modified flat cross-section glass fiber to MBS-type core-shell structure impact modifier within the range of 1.2:1-1.8:1, so that the heat resistance and rigidity brought by glass fiber reinforcement are matched with the impact energy absorption effect of MBS rubber core layer, thereby alleviating the problem of material brittleness after glass fiber reinforcement.
[0035] 3. This invention pre-treats nano-silica with acidification and controls its ratio with composite modified flat cross-section glass fiber, so that nano-silica can be distributed at the glass fiber / resin interface and the elastomer / resin phase interface, reducing initial defects and inducing impact energy dissipation, and avoiding excessive agglomeration of nanoparticles to form defect sources. Attached Figure Description
[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0037] Figure 1 This is a SEM cross-sectional image of an ABS composite plastic material and its preparation method provided by an embodiment of the present invention;
[0038] Figure 2 This is an FTIR image of an ABS composite plastic material and its preparation method provided by an embodiment of the present invention;
[0039] Figure 3 This is a schematic XPS spectrum of an ABS composite plastic material and its preparation method provided by an embodiment of the present invention. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0041] Example 1
[0042] An ABS composite plastic material, by weight, comprises the following components: 60 parts ABS resin; 15 parts composite modified flat cross-section glass fiber; 10 parts MBS-type core-shell structure impact modifier; 5 parts maleic anhydride-grafted ABS; 1.5 parts calcium stearate; 0.8 parts a mixture of hindered phenolic antioxidant and phosphite antioxidant in a weight ratio of 1.5:1; and 1.5 parts acid-pretreated nano-silica.
[0043] The flatness ratio of the glass fiber is 3:1, and the aspect ratio is 45. The weight ratio of γ-aminopropyltriethoxysilane to dimethylhydroxysilicone oil is 1:1, and the total amount is 1.5% of the weight of the glass fiber. The core layer of the MBS-type core-shell structure impact modifier is polybutadiene elastomer, and the shell layer is methyl methacrylate-styrene copolymer, with a core-shell ratio of 6.5:3.5 and an average particle size of 0.3μm. The grafting rate of maleic anhydride-grafted ABS is 0.8%. The average particle size of nano-silica is 30nm, the specific surface area is 220m² / g, and the weight ratio of nano-silica to the composite modified flat cross-section glass fiber is 1:10.
[0044] The preparation method is as follows: S1, nano-silica is ultrasonically dispersed in dilute hydrochloric acid at pH=4 for 30 min, filtered, washed, and dried to obtain acidified pretreated nano-silica; S2, flat cross-section glass fibers are dispersed in NaOH solution at pH=8.5, stirred for 30 min, filtered and dried, and then added to an ethanol solution of γ-aminopropyltriethoxysilane and dimethylhydroxysilicone oil, stirred at 80℃ for 2 h, and dried to obtain composite modified flat cross-section glass fibers; S3, ABS resin, MBS-type core-shell structure impact modifier, maleic anhydride grafted ABS, lubricant, antioxidant, and acidified pretreated nano-silica are added to a high-speed mixer and mixed for 5 min to obtain a premix; S4, the premix is added through the main feed port of a twin-screw extruder, and the composite modified flat cross-section glass fibers are added through the side feed port. The mixture is melt-blended, extruded, cooled, and granulated at 220-250℃. The main speed of the twin-screw extruder is 200-400 r / min.
[0045] Example 2
[0046] The composition and preparation method are basically the same as in Example 1, except that: 55 parts of ABS resin; 12 parts of composite modified flat cross-section glass fiber; 8 parts of MBS-type core-shell structure impact modifier; 4 parts of maleic anhydride grafted ABS; 1 part of polyethylene wax; 0.5 parts of antioxidant, with the weight ratio of hindered phenolic antioxidant to phosphite antioxidant being 1:1; and 1 part of acidified pretreated nano-silica.
[0047] The flatness ratio of the flat cross-section glass fiber is 2:1, and the aspect ratio is 30; the weight ratio of γ-aminopropyltriethoxysilane to dimethylhydroxysilicone oil is 1:0.5, and the total amount is 1.0%; the core-shell ratio of MBS is 6:4, and the average particle size is 0.1μm; the grafting rate of maleic anhydride-grafted ABS is 0.5%; the average particle size of nano-silica is 10nm, the specific surface area is 300m² / g, and the weight ratio of nano-silica to the composite modified flat cross-section glass fiber is 1:12.
[0048] Example 3
[0049] The composition and preparation method are basically the same as in Example 1, except that: 65 parts of ABS resin; 18 parts of composite modified flat cross-section glass fiber; 12 parts of MBS-type core-shell structure impact modifier; 6 parts of maleic anhydride grafted ABS; 2 parts of ethylene bis-stearamide; 1 part of antioxidant, with the weight ratio of hindered phenolic antioxidant to phosphite antioxidant being 2:1; and 1.5 parts of acidified pretreated nano-silica.
[0050] The flatness ratio of the flat cross-section glass fiber is 5:1, and the aspect ratio is 60; the weight ratio of γ-aminopropyltriethoxysilane to dimethylhydroxysilicone oil is 1:2, and the total amount is 2.0%; the core-shell ratio of MBS is 7:3, and the average particle size is 0.5μm; the grafting rate of maleic anhydride-grafted ABS is 1.0%; the average particle size of nano-silica is 50nm, the specific surface area is 150m² / g, and the weight ratio of nano-silica to the composite modified flat cross-section glass fiber is 1:12.
[0051] Example 4
[0052] An ABS composite plastic material, by weight, comprises the following components: 60 parts ABS resin; 16 parts composite modified flat cross-section glass fiber; 10 parts MBS-type core-shell structure impact modifier; 5 parts maleic anhydride-grafted ABS; 1.5 parts zinc stearate; 0.8 parts a mixture of hindered phenolic antioxidant and phosphite antioxidant in a weight ratio of 1:1; and 1.5 parts acid-pretreated nano-silica.
[0053] The flattened glass fiber has a flatness ratio of 4:1 and an aspect ratio of 50; the weight ratio of γ-aminopropyltriethoxysilane to dimethylhydroxysilicone oil is 1:1.5, with a total content of 1.8%; the MBS core-shell ratio is 7:3, and the average particle size is 0.4 μm; the maleic anhydride-grafted ABS grafting rate is 0.9%; the nano-silica has an average particle size of 40 nm, a specific surface area of 180 m² / g, and a weight ratio of 1:10 with the composite modified flattened glass fiber. The preparation method is the same as in Example 1.
[0054] Example 5
[0055] The composition and preparation method are basically the same as in Example 1, except that: 18 parts of composite modified flat cross-section glass fiber and 10 parts of MBS-type core-shell structure impact modifier are used to make the weight ratio of composite modified flat cross-section glass fiber to MBS-type core-shell structure impact modifier 1.8:1. The remaining components and process parameters are the same as in Example 1.
[0056] Comparative Example 1
[0057] The composition is basically the same as in Example 1, except that the composite modified flat cross-section glass fiber is replaced with unmodified ordinary round glass fiber, and the composite modification of silane and hydroxyl silicone oil is not performed. The other components, dosages and parameters are the same.
[0058] Comparative Example 2
[0059] The composition is basically the same as in Example 1, except that the flat cross-section glass fiber is only subjected to alkaline dispersion treatment and γ-aminopropyltriethoxysilane and dimethylhydroxysilicone oil are not added for composite modification. The other components, dosages and parameters are the same.
[0060] Comparative Example 3
[0061] The composition is basically the same as in Example 1, except that the MBS-type core-shell structure impact modifier is replaced with ordinary POE elastomer, and there is no core-shell structure design. The other components, dosages and parameters are the same.
[0062] Comparative Example 4
[0063] The composition is basically the same as in Example 1, except that maleic anhydride grafted ABS compatibilizer is not added, while the other components, amounts and parameters are the same.
[0064] Comparative Example 5
[0065] The composition is basically the same as that in Example 1, except that: the nano silica is not pretreated with acidification, and the weight ratio of nano silica to composite modified flat cross-section glass fiber is 1:5, which is beyond the scope of this invention. The other components, dosages and parameters are the same.
[0066] Comparative Example 6
[0067] The composition is basically the same as that in Example 1, except that: the amount of composite modified flat cross-section glass fiber is 10 parts, the amount of MBS-type core-shell structure impact modifier is 12 parts, and the weight ratio of the two is 1:1.2, which is beyond the scope of this invention. The other components, amounts and parameters are the same.
[0068] Comparative Example 7
[0069] A control sample was obtained by using only pure ABS resin without adding heat-resistant modifiers, impact modifiers, compatibilizers, lubricants, antioxidants, or nano-silica, and by melting, extruding, cooling, and granulating under the same extrusion process conditions.
[0070] Comparative Example 8
[0071] The composition is basically the same as in Example 1, except that the glass fiber has a circular cross-section and a flatness of 1:1. However, it is also modified by composite of γ-aminopropyltriethoxysilane and dimethylhydroxysilicone oil. The other components, dosages and parameters are the same.
[0072] Comparative Example 9
[0073] The composition is basically the same as in Example 1, except that: the amount of composite modified flat cross-section glass fiber is 22 parts, which exceeds the scope of this invention; the MBS-type core-shell structure impact modifier is still 10 parts; and the other components, amounts and parameters are the same.
[0074] Comparative Example 10
[0075] The composition is basically the same as that in Example 1, except that the flat cross-section glass fiber is modified only by γ-aminopropyltriethoxysilane and no dimethyl hydroxy silicone oil is added. The other components, dosages and parameters are the same.
[0076] Comparative Example 11
[0077] The composition is basically the same as in Example 1, except that the flat cross-section glass fiber is modified with dimethyl hydroxy silicone oil alone, without the addition of γ-aminopropyltriethoxysilane. The other components, dosages and parameters are the same.
[0078] Table 1 Performance Test Results
[0079] Group Heat distortion temperature (°C) Notched impact strength of a simply supported beam (kJ / m²) Elongation at break (%) Tensile strength (MPa) Dispersed state Example 1 119 43 28 59 Uniform without precipitation Example 2 112 38 24 54 uniform Example 3 126 40 22 63 uniform Example 4 122 41 26 61 uniform Example 5 127 36 20 65 uniform Comparative Example 1 106 24 12 46 Exposed fibers Comparative Example 2 108 29 15 48 Weak interface integration Comparative Example 3 107 27 14 47 Poor toughness Comparative Example 4 103 25 11 42 Phase separation Comparative Example 5 105 26 12 44 Uneven distribution Comparative Example 6 106 31 16 46 Poor performance synergy Comparative Example 7 88 18 8 42 uniform Comparative Example 8 109 28 14 48 Interface integration Comparative Example 9 128 25 10 60 Increased brittleness, decreased impact strength Comparative Example 10 110 31 17 51 Interface integration Comparative Example 11 107 30 16 49 Scattered but slightly reunited
[0080] As shown in Table 1, the ABS composite plastic materials prepared in Examples 1-5 are superior to most comparative examples in terms of heat distortion temperature, notched beam impact strength, elongation at break, tensile strength, and dispersion state. The heat distortion temperature of the example group reaches 112-127℃, the notched beam impact strength reaches 36-43kJ / m², the system is uniformly dispersed, and there is no obvious fiber exposure or phase separation phenomenon, indicating that the multi-component synergistic design of the present invention can take into account both heat resistance and impact resistance.
[0081] Examples 1 and Comparative Example 8 show that, under the same composite modification conditions, Example 1 (flatness 3:1) achieves a heat distortion temperature of 119°C and a simply supported beam impact strength of 43 kJ / m², while Comparative Example 8 (circular cross-section, flatness 1:1) only achieves 109°C and 28 kJ / m². kJ / m²; Analysis suggests that flat fibers are less prone to axial rotation and slippage in the matrix resin, forming an effective mechanical interlocking structure. Simultaneously, the increased contact area facilitates uniform stress transfer at the interface, thereby simultaneously improving the material's heat resistance, stiffness, and impact toughness. This invention employs a compound system of γ-aminopropyltriethoxysilane and dimethylhydroxy silicone oil to modify the surface of flat glass fibers. The mechanism of action is as follows: the ethoxy groups of the silane coupling agent, after hydrolysis, undergo a condensation reaction with the silanol groups on the glass fiber surface, forming stable Si-O-Si covalent bonds. The terminal amino groups can react with the anhydride groups in the ABS matrix or maleic anhydride-grafted ABS, or form hydrogen bonds, thus establishing a chemical bridge between the fiber and the resin. Simultaneously, the introduction of dimethylhydroxy silicone oil reduces the fiber surface tension, improving fiber dispersion in the resin matrix; furthermore, its flexible molecular chain segments form a flexible interface layer, buffering interfacial stress concentration.
[0082] The comparison between Example 1 and Comparative Examples 2, 10, and 11 illustrates that flat cross-section glass fibers treated only with alkali dispersion without modification show weak interfacial bonding and limited improvement in heat resistance and impact performance. While silane modification alone (Comparative Example 10) can establish chemical bridging and improve heat resistance, it lacks a flexible interfacial layer, resulting in significantly lower impact strength and elongation at break. Similarly, while hydroxyl silicone oil modification alone (Comparative Example 11) improves dispersibility, it fails to form stable chemical bonds, leading to insufficient interfacial bonding and a significant decrease in heat resistance and tensile strength. Only silane coupling agent and... Hydroxyl silicone oil composite modification is necessary to achieve the synergistic effect of "chemical anchoring + flexible buffering", which maximizes the interfacial bonding strength, heat resistance and impact resistance simultaneously. Therefore, neither alkali dispersion alone, silane modification alone, nor hydroxyl silicone oil modification alone can achieve high heat resistance and high impact resistance at the same time. γ-aminopropyltriethoxysilane can form a strong interfacial bond with the silanol groups on the glass fiber surface and interact with maleic anhydride-grafted ABS. Dimethyl hydroxy silicone oil can improve fiber dispersion and form a flexible interfacial layer. The combined use of the two is conducive to forming a strong and tough interface between the fiber and the resin.
[0083] The comparison between Example 1 and Comparative Example 5 shows that acid-pretreated nano-silica and controlling its weight ratio with composite modified flat cross-section glass fiber are important conditions for achieving the densification of micro-nano interfaces and the dissipation of impact energy. In Comparative Example 5, the nano-silica was not acid-pretreated and the proportion was too high, resulting in uneven dispersion and a significant decrease in heat distortion temperature and impact strength. This indicates that excessive or poorly dispersed nano-silica can transform into a defect source.
[0084] Example 1 and Comparative Example 4 further illustrate that maleic anhydride-grafted ABS compatibilizer helps improve the interfacial compatibility between the ABS matrix, MBS-type core-shell structure impact modifier, composite modified flat cross-section glass fiber, and acid-pretreated nano-silica. Without the addition of the compatibilizer, phase separation occurs in the system, and the heat distortion temperature, impact strength, and tensile strength all decrease.
[0085] like Figure 1 As shown, in the cross-sectional morphology of the ABS composite plastic material obtained in Example 1, flat cross-section glass fibers are embedded in the ABS matrix. No obvious continuous annular debonding pores appear around the fibers. The nano-SiO2 dispersed phase is distributed in fine particles. The cross-section has tough tearing and microporous energy absorption characteristics. This morphology corresponds to the higher impact strength and tensile strength in Table 1.
[0086] like Figure 2 As shown, Si-O-Si, Si-CH3, CH, C≡N and interface-related characteristic peaks are visible in the composite modified flat cross-section glass fiber and ABS composite plastic materials, indicating that the silane coupling agent and hydroxyl silicone oil modified layer are conducive to the formation of organic / inorganic interface transition layer.
[0087] like Figure 3 As shown, C1s, O1s, N1s and Si2p signals are visible in the XPS spectrum. The fitting peaks of CO / CN, C=O, Si-O-Si, Si-C / Si-OH and nitrogen-containing groups in the high-resolution spectrum can be used to further corroborate the existence of silane coupling agents, acidified nano-SiO2 and interfacial interactions.
[0088] In summary, this invention utilizes the synergistic effects of composite modified flat-section glass fiber, MBS-type core-shell impact modifier, maleic anhydride-grafted ABS, and acid-pretreated nano-silica, while limiting the proportions of each component, to form a technical solution that combines "glass fiber morphology reinforcement, composite interface modification, elastomer energy absorption, and nano-interface densification." This improves upon the problems of brittleness after reinforcement, decreased heat resistance after toughening, and uneven filler dispersion in traditional ABS composites.
[0089] It should be noted that the specific model and specifications need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.
[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.
Claims
1. An ABS composite plastic material, characterized in that, By weight, it consists of the following components: 55-65 parts of ABS resin 12-18 parts of composite modified flat cross-section glass fiber MBS-type core-shell structure impact modifier, 8-12 parts. Maleic anhydride-grafted ABS 4-6 parts 1-2 parts lubricant Antioxidant 0.5-1 part 0.5-1.5 parts of pretreated nano-silica with acidification; The composite modified flat cross-section glass fiber is a flat cross-section glass fiber modified by composite modification of γ-aminopropyltriethoxysilane and dimethylhydroxy silicone oil, wherein the weight ratio of γ-aminopropyltriethoxysilane to dimethylhydroxy silicone oil is 1:0.5-1:2; The weight ratio of the composite modified flat cross-section glass fiber to the MBS-type core-shell structure impact modifier is 1.2:1-1.8:1; The weight ratio of the acidified pretreated nano-silica to the composite modified flat cross-section glass fiber is 1:10-1:
24.
2. The ABS composite plastic material according to claim 1, wherein, The flatness of the flat cross-section glass fiber is 2:1-5:1, and the aspect ratio is 30-60.
3. The ABS composite plastic material of claim 1, wherein, The total amount of γ-aminopropyltriethoxysilane and dimethylhydroxysilicone oil used is 1.0%-2.0% of the weight of the flat cross-section glass fiber.
4. The ABS composite plastic material of claim 1, wherein, The core layer of the MBS-type core-shell structure impact modifier is polybutadiene elastomer, and the shell layer is methyl methacrylate-styrene copolymer. The weight ratio of the core layer to the shell layer is 6:4-7:3, and the average particle size is 0.1-0.5μm.
5. The ABS composite plastic material of claim 1, wherein, The grafting rate of maleic anhydride-grafted ABS is 0.5%-1.0%.
6. The ABS composite plastic material according to claim 1, characterized in that, The acidified pretreated nano-silica has an average particle size of 10-50 nm and a specific surface area of 150-300 m² / g.
7. The ABS composite plastic material according to claim 1, characterized in that, The lubricant is selected from at least one of calcium stearate, zinc stearate, polyethylene wax, and ethylene bis-stearamide.
8. The ABS composite plastic material according to claim 1, characterized in that, The antioxidant is a compound mixture of hindered phenolic antioxidants and phosphite antioxidants, with a weight ratio of 1:1 to 2:
1.
9. An ABS composite plastic material according to claim 1, characterized in that, The acidified pretreated nano-silica is obtained by ultrasonic dispersion, filtration, washing and drying in an acid solution with a pH of 3-5.
10. A method for preparing the ABS composite plastic material according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Place nano-silica in an acidic solution with pH 3-5 and ultrasonically disperse for 20-40 min. Filter, wash and dry to obtain acidified pretreated nano-silica. S2: Flat cross-section glass fibers are dispersed in sodium hydroxide alkaline solution with pH 8-9, filtered and dried, and then a mixed solution of γ-aminopropyltriethoxysilane and dimethyl hydroxy silicone oil is added for composite modification treatment. After drying, composite modified flat cross-section glass fibers are obtained. S3: ABS resin, MBS-type core-shell structure impact modifier, maleic anhydride grafted ABS, lubricant, antioxidant and acidified pretreated nano-silica obtained in S1 are added to a high-speed mixer and mixed evenly to obtain a premix. S4: The premixed material obtained in S3 is added through the main feed port of the twin-screw extruder, and the composite modified flat cross-section glass fiber obtained in S2 is added through the side feed port. After melt blending, extrusion, cooling and granulation, the ABS composite plastic material is obtained.