A glass fiber reinforced abs material and a method for producing the same
By modifying chopped glass fibers with a composite toughening agent and an interface compatibilizer, and combining this with an optimized stepwise feeding process, the problems of decreased toughness and floating fiber defects in ABS fiber-reinforced materials were solved, and the preparation of high-rigidity, high-toughness, and low-cost glass fiber reinforced ABS materials was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGGUAN CITY BAOHUA PLASTIC MATERIAL CO LTD
- Filing Date
- 2026-05-14
- Publication Date
- 2026-06-26
AI Technical Summary
Existing ABS fiber reinforcement technology suffers from problems such as reduced toughness, floating fiber defects, and high processing difficulty, making it difficult to apply in high-temperature environments and high-precision parts.
Glass fiber reinforced ABS material is prepared by combining short-cut glass fiber with long glass fiber, along with composite toughening agents and interface compatibilizers, and by modifying it with silane coupling agents and polysiloxane-polyether block copolymers, combined with surface modifying agents and high-efficiency lubricants, and by optimizing the step-by-step feeding process.
It improves the notched impact strength of the cantilever beam, enhances the interfacial bonding force, suppresses fiber floating, reduces production costs and energy consumption, and achieves a balance between high rigidity and high toughness, with a smooth surface and easy processing.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of polymer material preparation technology, and particularly relates to a glass fiber reinforced ABS material and its preparation method. Background Technology
[0002] ABS resin, a commonly used thermoplastic engineering plastic, boasts advantages such as excellent processability, high surface gloss, and good impact resistance, leading to its widespread application across various industries. However, in engineering structural components and high-temperature environments, ordinary ABS resin faces significant technical bottlenecks, primarily in three aspects: First, insufficient heat resistance, with a heat distortion temperature typically only between 80℃ and 90℃. Exceeding this temperature easily causes softening and deformation, limiting its application in high-temperature environments such as automotive engine compartments. Second, insufficient strength and rigidity, making it prone to bending and breakage when used as load-bearing structural components, failing to meet the demands of heavy-duty scenarios. Third, poor dimensional stability, with a large molding shrinkage rate significantly affected by temperature changes, making it unsuitable for the production of high-precision parts.
[0003] To address the aforementioned issues, the industry widely employs glass fiber reinforcement technology to modify ABS resin. By melt-blending ABS resin with glass fiber to prepare fiber-reinforced ABS composites, the heat resistance, rigidity, and dimensional stability of the material can be significantly improved. After modification, the material's heat distortion temperature can be increased to over 100℃-150℃, the flexural modulus can reach 2000MPa-6000MPa, and the coefficient of linear expansion and molding shrinkage can be reduced to 1 / 2-1 / 4 of that of pure ABS, giving it the potential to replace some metals and expensive engineering plastics (such as nylon).
[0004] Currently, ABS fiber-reinforced modification typically employs a twin-screw extruder melt blending process. This involves mixing ABS resin with surface-treated glass fibers (10%-40%) and various additives, then melting, extruding, and pelletizing at high temperatures to produce masterbatch. Strict control of glass fiber length (0.3-1mm) and dispersion uniformity is crucial during production to ensure product performance. Existing technologies primarily utilize two processes: short glass fiber reinforcement and long glass fiber reinforcement. Short glass fiber reinforcement (accounting for over 90% of the market) is simple to process and has good flowability, making it suitable for injection molding complex shapes, but its mechanical properties, especially impact resistance, are limited. Long glass fiber reinforcement offers superior mechanical properties and strong impact resistance, but it requires advanced equipment and has high production costs, hindering large-scale adoption.
[0005] Although ABS fiber reinforcement technology has been widely used, it still faces three major challenges that severely restrict its further application: First, the toughness decreases significantly. As the glass fiber content increases, the notched impact strength of the material decreases significantly, making the material brittle and its impact resistance much worse than ordinary ABS, failing to meet the needs of scenarios requiring both rigidity and impact resistance. Second, the surface quality is poor. The high hardness of glass fiber not only exacerbates the wear of injection molds but also easily appears on the product surface, leading to surface roughness, floating fibers, pitting, and other defects, with a significant decrease in gloss (usually between 20° and 80°), making it unsuitable for products requiring aesthetically pleasing surfaces. Third, the processing is more difficult. The material's fluidity changes after fiber reinforcement and causes severe wear on equipment, requiring wear-resistant screws, nozzles, and precision temperature control systems, increasing production input and process control difficulty.
[0006] In existing technologies, toughening agents and amino-modified silicone oils are commonly added to address the aforementioned problems. However, these methods have significant limitations: while simply adding toughening agents can improve toughness, it sacrifices the material's rigidity and heat resistance; adding amino-modified silicone oil or wollastonite mineral fibers can alleviate fiber floating issues, but it leads to a decrease in the material's mechanical properties and fails to fundamentally solve the core problems of uneven glass fiber dispersion and weak interfacial bonding. Furthermore, traditional long glass fiber reinforcement processes employ melt impregnation, which suffers from insufficient glass fiber wetting, cumbersome procedures, and high energy consumption, while short glass fiber reinforcement processes struggle to balance rigidity and toughness. Therefore, developing an ABS fiber-reinforced composite material and its preparation method that can simultaneously address the issues of decreased toughness, fiber floating defects, and processing difficulties has become an urgent need in the industry and is the core research and development objective of this invention. Summary of the Invention
[0007] The purpose of this invention is to provide a glass fiber reinforced ABS material and its preparation method. This invention breaks through the limitations of single glass fiber reinforcement or single toughening in the prior art. It adopts an integrated technical solution of composite glass fiber combination + composite modification + step feeding, which solves the technical problems of insufficient toughness, serious fiber floating and high processing difficulty of existing fiber-reinforced ABS.
[0008] To achieve the above objectives, the present invention provides the following technical solution: A glass fiber reinforced ABS material and its preparation method are disclosed. The components, by weight percentage, include: 50%-75% ABS resin, 15%-35% composite glass fiber, 3%-8% composite toughening agent, 0.2%-0.6% antioxidant, 0.3%-1.2% high-efficiency lubricant, 1%-3% interface compatibilizer, and 0.5%-1.5% surface modifying agent. The composite glass fiber is a mixture of chopped glass fiber and long glass fiber in a mass ratio of 3:1-5:1, and modified by a compound system of silane coupling agent KH-550 and polysiloxane-polyether block copolymer. The composite toughening agent is a compound system of carboxyl-terminated liquid nitrile rubber and core-shell toughening agent MBS in a mass ratio of 2:1-3:1. The interface compatibilizer is maleic anhydride-grafted ABS with a grafting rate of 0.8%-1.5%. The surface modifying agent is a compound system of amino-modified silicone oil and nano-silica.
[0009] As a preferred embodiment of the present invention, the ABS resin contains 18%-25% butadiene, 20%-28% acrylonitrile, 47%-62% styrene, and has a melt flow rate of 15-30 g / 10 min.
[0010] As a preferred embodiment of the present invention, the chopped glass fiber has a length of 0.5-1 mm and the long glass fiber has a length of 3-5 mm; in the compound modifier, the mass ratio of silane coupling agent KH-550 to polysiloxane-polyether block copolymer is 1:2-1:4, and the amount of modifier is 1.2%-2.5% of the mass of composite glass fiber.
[0011] As a preferred embodiment of the present invention, the core-shell toughening agent MBS contains 60%-70% butadiene in the core layer and 30%-40% methyl methacrylate in the shell layer.
[0012] As a preferred embodiment of the present invention, the antioxidant is a compound system of hindered phenolic antioxidant 1010 and phosphite antioxidant 168, with a compound mass ratio of 1:1 to 1:2; the high-efficiency lubricant is a compound system of calcium stearate and pentaerythritol stearate, with a compound mass ratio of 2:1 to 3:1.
[0013] In a preferred embodiment of the present invention, the weight-average molecular weight of the interface compatibilizer is 30,000-60,000 g / mol; in the surface modifying agent, the mass ratio of amino-modified silicone oil to nano-silica is 3:1-5:1, and the particle size of nano-silica is 20-50 nm.
[0014] This invention also provides a method for preparing glass fiber reinforced ABS composite material, comprising the following steps: ① Surface modification treatment of composite glass fiber: Short glass fiber and long glass fiber are mixed evenly in a preset ratio, heat-treated at high temperature and cooled, then immersed in a compound modifier aqueous solution, and dried to obtain surface modified composite glass fiber. ② Raw material pretreatment: Dry the ABS resin, composite toughening agent, antioxidant, high-efficiency lubricant, interface compatibilizer, and surface modifier separately to remove moisture. The drying temperature is 80-90℃ and the time is 2-4 hours. The moisture content of the ABS resin after drying is ≤0.05%. ③ Melt blending and step feeding: The pretreated ABS resin and various additives are added to the main feed port of the twin-screw extruder, and after melting, the surface-modified composite glass fiber is added from the side feed port; ④ Impregnation, shearing, and extrusion pelletizing: After being impregnated by screw shearing, the material is extruded, cooled, and pelletized to obtain masterbatch with a particle size of 2-4 mm; ⑤ Post-processing: Vacuum dry the masterbatch to obtain the finished product. The vacuum drying temperature is 70-90℃ and the time is 3-5 hours.
[0015] As a preferred embodiment of the present invention, in step ①, the high-temperature heat treatment temperature is 400-500℃ and the time is 4-6 hours; the impregnation time is 15-30 minutes, the drying temperature is 70-90℃, and the moisture content of the glass fiber after drying is ≤0.1%; the pH value of the compound modifier aqueous solution is 4-5.
[0016] As a preferred embodiment of the present invention, in step ③, the temperatures of each section of the twin-screw extruder are as follows: feeding section 150-160℃, melting section 180-200℃, homogenization section 200-210℃, die head temperature 205-215℃, screw speed 200-300 r / min; and side feed port temperature 185-195℃.
[0017] In summary, the beneficial technical effects of the present invention are as follows: 1. This invention uses a combination of short-cut glass fiber and long glass fiber, combined with the synergistic effect of composite toughening agent and interface compatibilizer, to improve the cantilever beam notched impact strength of the material by 30%-50% while ensuring high rigidity and high heat resistance. This solves the core defects of existing fiber-reinforced ABS, such as decreased toughness and easy embrittlement, and achieves synergistic optimization of rigidity and toughness.
[0018] 2. By modifying the composite glass fiber with a silane coupling agent and a polysiloxane-polyether block copolymer, and with the synergistic effect of surface modification additives and high-efficiency lubricants, the interfacial bonding force between the glass fiber and ABS resin is fundamentally improved, inhibiting glass fiber agglomeration and floating fiber phenomena. The product surface is smooth and free of pits, and the gloss is improved to 85°-95°, reaching the surface level of ordinary ABS. At the same time, it reduces the wear of glass fiber on injection molds and lowers mold maintenance costs.
[0019] 3. This invention optimizes the step-by-step feeding process, precisely controlling the temperature and speed of the glass fiber side feeding to avoid scorching and breakage of the glass fiber. At the same time, the material processing fluidity is improved through formula optimization. There is no need to equip it with special wear-resistant screws and nozzles; ordinary twin-screw extruders can achieve large-scale production. Compared with the traditional long glass fiber reinforcement process, this invention simplifies the process, reduces energy consumption by more than 30%, increases the glass fiber length retention rate to more than 90%, and reduces production costs by 15%-20%, balancing high performance and economy. Detailed Implementation
[0020] The present invention will now be described in further detail.
[0021] This invention provides a technical solution: a glass fiber reinforced ABS material and its preparation method. The glass fiber reinforced ABS material, by weight percentage, comprises: 50%-75% ABS resin, 15%-35% composite glass fiber, 3%-8% composite toughening agent, 0.2%-0.6% antioxidant, 0.3%-1.2% high-efficiency lubricant, 1%-3% interface compatibilizer, and 0.5%-1.5% surface modifying agent; the composite glass fiber is composed of short-cut glass fibers. The fiber is a mixture of long glass fiber and filament fiber in a mass ratio of 3:1 to 5:1, and is modified by a compound system of silane coupling agent KH-550 and polysiloxane-polyether block copolymer; the composite toughening agent is a compound of carboxyl-terminated liquid nitrile rubber and core-shell toughening agent MBS in a mass ratio of 2:1 to 3:1; the interface compatibilizer is maleic anhydride-grafted ABS with a grafting rate of 0.8% to 1.5%; the surface modifying agent is a compound system of amino-modified silicone oil and nano-silica.
[0022] The butadiene content in ABS resin is 18%-25%, the acrylonitrile content is 20%-28%, the styrene content is 47%-62%, and the melt flow rate is 15-30 g / 10 min.
[0023] The chopped glass fiber has a length of 0.5-1 mm and the long glass fiber has a length of 3-5 mm. In the compound modifier, the mass ratio of silane coupling agent KH-550 to polysiloxane-polyether block copolymer is 1:2-1:4, and the amount of modifier is 1.2%-2.5% of the mass of composite glass fiber.
[0024] In the core-shell toughening agent MBS, the core layer contains 60%-70% butadiene and the shell layer contains 30%-40% methyl methacrylate.
[0025] The antioxidant is a compound system of hindered phenolic antioxidant 1010 and phosphite antioxidant 168, with a compound mass ratio of 1:1 to 1:2; the high-efficiency lubricant is a compound system of calcium stearate and pentaerythritol stearate, with a compound mass ratio of 2:1 to 3:1.
[0026] The weight-average molecular weight of the interface compatibilizer is 30,000-60,000 g / mol; in the surface modifying agent, the mass ratio of amino-modified silicone oil to nano-silica is 3:1-5:1, and the particle size of nano-silica is 20-50 nm.
[0027] Its preparation method includes the following steps: ① Surface modification treatment of composite glass fiber: Short glass fiber and long glass fiber are mixed evenly in a preset ratio, subjected to high temperature heat treatment and then cooled, and then immersed in a compound modifier aqueous solution for impregnation. After drying, surface modified composite glass fiber is obtained. The high temperature heat treatment temperature is 400-500℃ and the time is 4-6 hours; the impregnation time is 15-30 minutes, the drying temperature is 70-90℃, and the moisture content of the glass fiber after drying is ≤0.1%; the pH value of the compound modifier aqueous solution is 4-5. ② Raw material pretreatment: Dry the ABS resin, composite toughening agent, antioxidant, high-efficiency lubricant, interface compatibilizer, and surface modifier separately to remove moisture. The drying temperature is 80-90℃ and the time is 2-4 hours. The moisture content of the ABS resin after drying is ≤0.05%. ③ Melt blending and step feeding: Pretreated ABS resin and various additives are added to the main feed port of the twin-screw extruder. After melting, surface-modified composite glass fiber is added from the side feed port. The temperatures of each section of the twin-screw extruder are as follows: feeding section 150-160℃, melting section 180-200℃, homogenization section 200-210℃, die head temperature 205-215℃, screw speed 200-300 r / min; side feed port temperature 185-195℃. ④ Impregnation, shearing, and extrusion pelletizing: After being impregnated by screw shearing, the material is extruded, cooled, and pelletized to obtain masterbatch with a particle size of 2-4 mm; ⑤ Post-processing: Vacuum dry the masterbatch to obtain the finished product. The vacuum drying temperature is 70-90℃ and the time is 3-5 hours.
[0028] Example 1 The glass fiber reinforced ABS composite material, by weight percentage, has the following components: ABS resin: 65% (butadiene content 22%, acrylonitrile content 25%, styrene content 53%, melt flow rate 22g / 10min); Composite glass fiber: 25% (0.8mm chopped glass fiber, 4mm long glass fiber, mass ratio 4:1; the modifier is a compound of silane coupling agent KH-550 and polysiloxane-polyether block copolymer, mass ratio 1:3, and the amount of modifier is 2.0% of the mass of composite glass fiber). Composite toughening agent: 5% (mass ratio of carboxyl-terminated liquid nitrile rubber to MBS core-shell toughening agent 2.5:1); Antioxidant: 0.4% (antioxidant 1010 to antioxidant 168 mass ratio 1:1.5); High-efficiency lubricant: 0.8% (calcium stearate to pentaerythritol stearate mass ratio 2.5:1); Interface compatibilizer: 2% (MAH-g-ABS, grafting rate 1.2%, weight average molecular weight 45000g / mol); Surface modifying agent: 1% (amino modified silicone oil to nano silica mass ratio 4:1, nano silica particle size 30nm).
[0029] The preparation method is as follows: 1. Surface modification of composite glass fiber: Short glass fiber and long glass fiber are mixed evenly at a ratio of 4:1, heat-treated at 450℃ for 5 hours, and cooled to room temperature; KH-550 and polysiloxane-polyether block copolymer are compounded at a ratio of 1:3, and deionized water is added to adjust the pH to 4.5 to prepare an aqueous solution of modifier; The mixed glass fiber is immersed in the aqueous solution for 20 minutes and dried at 80℃ until the moisture content is ≤0.1% to obtain modified composite glass fiber.
[0030] 2. Raw material pretreatment: Place each component in an 85℃ drying oven for 3 hours to ensure that the moisture content of the ABS resin is ≤0.05%.
[0031] 3. Melt blending and step feeding: Add ABS resin and various additives to the main feed port of the twin-screw extruder, and set the temperatures of each section as follows: feeding section 155℃, melting section 190℃, homogenization section 205℃, die head temperature 210℃, and screw speed 260r / min; after the material melts, add modified composite glass fiber from the side feed port at a temperature of 190℃.
[0032] 4. Extrusion pelletizing: After being sheared and impregnated by the screw, the material is extruded from the die head, cooled in a 28℃ cooling water tank, and cut into 3mm masterbatch by the pelletizer.
[0033] 5. Post-processing: The masterbatch is vacuum dried at 80℃ for 4 hours to obtain the finished product.
[0034] Example 2 The glass fiber reinforced ABS composite material, by weight percentage, has the following components: ABS resin: 58% (butadiene content 20%, acrylonitrile content 23%, styrene content 57%, melt flow rate 18g / 10min); Composite glass fiber: 30% (0.6mm chopped glass fiber, 3.5mm long glass fiber, mass ratio 3.5:1; modifier is KH-550 compounded with polysiloxane-polyether block copolymer, mass ratio 1:2.5, modifier dosage is 2.2% of the composite glass fiber mass). Composite toughening agent: 7% (mass ratio of carboxyl-terminated liquid nitrile rubber to MBS core-shell toughening agent 3:1); Antioxidant: 0.5% (antioxidant 1010 to antioxidant 168 mass ratio 1:2); High-efficiency lubricant: 1.0% (calcium stearate to pentaerythritol stearate mass ratio 3:1); Interface compatibilizer: 2.5% (MAH-g-ABS, grafting rate 1.4%, weight average molecular weight 50000g / mol); Surface modifying agent: 1.0% (amino modified silicone oil to nano silica mass ratio 5:1, nano silica particle size 25nm).
[0035] The preparation method is the same as in Example 1, except that the twin screw speed is adjusted to 280 r / min, the side feed port temperature is 195℃, and the cooling water tank temperature is 25℃.
[0036] Example 3 The glass fiber reinforced ABS composite material, by weight percentage, has the following components: ABS resin: 72% (butadiene content 24%, acrylonitrile content 26%, styrene content 50%, melt flow rate 28g / 10min); Composite glass fiber: 20% (0.9mm chopped glass fiber, 4.5mm long glass fiber, mass ratio 4.5:1; modifier is KH-550 and polysiloxane-polyether block copolymer, mass ratio 1:3.5, modifier dosage is 1.8% of the composite glass fiber mass). Composite toughening agent: 4% (mass ratio of carboxyl-terminated liquid nitrile rubber to MBS core-shell toughening agent 2:1); Antioxidant: 0.3% (antioxidant 1010 to antioxidant 168 mass ratio 1:1); High-efficiency lubricant: 0.7% (calcium stearate to pentaerythritol stearate mass ratio 2:1); Interface compatibilizer: 1.5% (MAH-g-ABS, grafting rate 1.0%, weight average molecular weight 40000g / mol); Surface modifying agent: 1.5% (amino modified silicone oil to nano silica mass ratio 3:1, nano silica particle size 40nm).
[0037] The preparation method is the same as in Example 1, except that the twin screw speed is adjusted to 240 r / min, the side feed port temperature is 185℃, and the cooling water tank temperature is 30℃.
[0038] Comparative Example 1 Composition: 70% ABS resin, 25% chopped glass fiber, 0.4% antioxidant, 0.6% lubricant, and 4% toughening agent; the preparation method adopts traditional short glass fiber melt blending without composite modification and step feeding optimization.
[0039] Comparative Example 2 Composition: 60% ABS resin, 35% long glass fiber, 0.5% antioxidant, 1.0% lubricant, and 3.5% toughening agent; the preparation method adopts the traditional melt impregnation method without composite modification.
[0040] All performance indicators of Examples 1-3 and Comparative Examples 1-2 were tested according to the following unified testing standards and methods to ensure the accuracy, comparability and repeatability of the test results. All test samples were standard specimens prepared by the same injection molding process (the specimen size met the corresponding standard requirements). The test environment was uniform: temperature 23±2℃, relative humidity 50±5%. The specimens were placed in this environment for 24 hours before testing.
[0041] 1. Heat distortion temperature test: The test was conducted in accordance with GB / T 1634.2-2004 "Determination of load distortion temperature of plastics - Part 2: Plastics, hard rubber and long fiber reinforced composites". A simply supported beam method was used, the test load was 1.80 MPa, the heating rate was 120℃ / h, and the temperature at which the sample produced a deformation of 0.25 mm was recorded as the heat distortion temperature.
[0042] 2. Vicat softening point test: The test was conducted in accordance with GB / T 1633-2000 "Determination of Vicat softening temperature (VST) of thermoplastic plastics". The A50 method was used, with a loading force of 50N and a heating rate of 50℃ / h. The temperature at which the sample was pressed into the ground by 1mm was recorded as the Vicat softening point.
[0043] 3. Flexural modulus test: The test was conducted in accordance with GB / T 9341-2008 "Determination of Flexural Properties of Plastics". The test was conducted using a simply supported beam bending method, with a sample span of 80 mm and a test speed of 2 mm / min. The elastic modulus during the bending process was calculated, which is the flexural modulus.
[0044] 4. Cantilever beam notched impact strength test: The test was conducted in accordance with GB / T 1843-2008 "Determination of impact strength of plastic cantilever beams". The specimen was a type A specimen with a V-notch (notch depth 2mm) and an impact energy of 2.75J. The impact strength of each specimen was recorded and the average value of 5 specimens was taken as the final test result.
[0045] 5. Surface gloss test: The test shall be conducted in accordance with GB / T 8807-1988 "Test method for mirror gloss of plastics". A 60° angle gloss meter shall be used to test the gloss at three different positions on the sample surface and the average value shall be taken as the final result. The unit of gloss is °.
[0046] 6. Molding shrinkage rate test: The test was conducted in accordance with GB / T 15585-1995 "Determination of molding shrinkage rate of thermoplastic plastics". A standard strip sample (length 120mm × width 10mm × thickness 4mm) was prepared. The difference between the actual size of the sample and the mold size after injection molding was recorded. The molding shrinkage rate was calculated using the following formula: Molding shrinkage rate (%) = (Mold size - Actual size of sample) / Mold size × 100%. The average value of 5 samples was taken as the final result.
[0047] 7. Surface defect detection: Visual observation method (assisted by a 40x magnifying glass) is used to observe whether there are defects such as floating fibers, pits, scratches, etc. on the sample surface under natural light. The defects are graded and recorded as follows: no defects (no floating fibers, no pits), slight defects (a small amount of floating fibers, which are difficult to detect with the naked eye, but can be seen under a magnifying glass), and obvious defects (floating fibers and pits are clearly visible to the naked eye).
[0048] All testing instruments have been calibrated, and the testing process strictly follows standard operating procedures to ensure that the test data are authentic and reliable, and can serve as valid evidence of the technical effects of this invention.
[0049] The test data obtained after the above tests are shown in the table below:
[0050] A comparison of Examples 1-3 with Comparative Examples 1-2 shows that the high-toughness, low-float glass fiber reinforced ABS composite material prepared by the present invention is superior to the prior art in terms of heat resistance, rigidity, toughness, surface quality, and processing economy.
[0051] 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.
[0052] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A glass fiber reinforced ABS material, characterized in that, By weight percentage, the components include: 50%-75% ABS resin, 15%-35% composite glass fiber, 3%-8% composite toughening agent, 0.2%-0.6% antioxidant, 0.3%-1.2% high-efficiency lubricant, 1%-3% interface compatibilizer, and 0.5%-1.5% surface modifying agent; the composite glass fiber is a mixture of chopped glass fiber and long glass fiber in a mass ratio of 3:1-5:1, and modified by a compound system of silane coupling agent KH-550 and polysiloxane-polyether block copolymer; the composite toughening agent is a compound system of carboxyl-terminated liquid nitrile rubber and core-shell toughening agent MBS in a mass ratio of 2:1-3:1; the interface compatibilizer is maleic anhydride-grafted ABS with a grafting rate of 0.8%-1.5%; the surface modifying agent is a compound system of amino-modified silicone oil and nano-silica.
2. The glass fiber reinforced ABS material and its preparation method according to claim 1, characterized in that, The ABS resin contains 18%-25% butadiene, 20%-28% acrylonitrile, and 47%-62% styrene, and has a melt flow rate of 15-30 g / 10 min.
3. The glass fiber reinforced ABS material and its preparation method according to claim 2, characterized in that, The chopped glass fibers have a length of 0.5-1 mm and the long glass fibers have a length of 3-5 mm. In the compound modifier, the mass ratio of silane coupling agent KH-550 to polysiloxane-polyether block copolymer is 1:2-1:4, and the amount of modifier is 1.2%-2.5% of the mass of composite glass fiber.
4. The glass fiber reinforced ABS material and its preparation method according to claim 1, characterized in that, In the core-shell toughening agent MBS, the core layer contains 60%-70% butadiene and the shell layer contains 30%-40% methyl methacrylate.
5. The glass fiber reinforced ABS material and its preparation method according to claim 3, characterized in that, The antioxidant is a compound system of hindered phenolic antioxidant 1010 and phosphite antioxidant 168, with a compound mass ratio of 1:1 to 1:2; the high-efficiency lubricant is a compound system of calcium stearate and pentaerythritol stearate, with a compound mass ratio of 2:1 to 3:
1.
6. The glass fiber reinforced ABS material and its preparation method according to claim 1, characterized in that, The weight-average molecular weight of the interface compatibilizer is 30,000-60,000 g / mol; in the surface modifying agent, the mass ratio of amino-modified silicone oil to nano-silica is 3:1-5:1, and the particle size of nano-silica is 20-50 nm.
7. A method for preparing the glass fiber reinforced ABS composite material as described in claim 1, characterized in that, Includes the following steps: ① Surface modification treatment of composite glass fiber: Short glass fiber and long glass fiber are mixed evenly in a preset ratio, heat-treated at high temperature and cooled, then immersed in a compound modifier aqueous solution, and dried to obtain surface modified composite glass fiber. ② Raw material pretreatment: Dry the ABS resin, composite toughening agent, antioxidant, high-efficiency lubricant, interface compatibilizer, and surface modifier separately to remove moisture. The drying temperature is 80-90℃ and the time is 2-4 hours. The moisture content of the ABS resin after drying is ≤0.05%. ③ Melt blending and step feeding: The pretreated ABS resin and various additives are added to the main feed port of the twin-screw extruder, and after melting, the surface-modified composite glass fiber is added from the side feed port; ④ Impregnation, shearing, and extrusion pelletizing: After being impregnated by screw shearing, the material is extruded, cooled, and pelletized to obtain masterbatch with a particle size of 2-4 mm; ⑤ Post-processing: Vacuum dry the masterbatch to obtain the finished product. The vacuum drying temperature is 70-90℃ and the time is 3-5 hours.
8. The preparation method according to claim 7, characterized in that, In step ①, the high-temperature heat treatment temperature is 400-500℃ and the time is 4-6 hours; the impregnation time is 15-30 minutes, the drying temperature is 70-90℃, and the moisture content of the glass fiber after drying is ≤0.1%; the pH value of the compound modifier aqueous solution is 4-5.
9. The preparation method according to claim 7, characterized in that, In step ③, the temperatures of each section of the twin-screw extruder are as follows: feeding section 150-160℃, melting section 180-200℃, homogenization section 200-210℃, die head temperature 205-215℃, screw speed 200-300 r / min; and side feed port temperature 185-195℃.