Modified plastic particles capable of enhancing high glossiness and preparation process thereof

Abstract

The invention relates to the technical field of high polymer material modification, and discloses a modified plastic particle capable of enhancing high glossiness and a preparation process thereof, the modified plastic particle comprises the following raw materials by weight: 50-70 parts of base resin, 20-30 parts of highlight enhanced resin, 2-5 parts of a compatilizer, 1-3 parts of a composite highlight auxiliary agent, 0.3-0.8 part of an antioxidant, 0.5-1.2 parts of a dispersant, and 0.4-0.6 part of a light stabilizer; the base resin is ABS (Acrylonitrile Butadiene Styrene) resin, and the melt flow rate is 2-5g / 10min (220 DEG C, 10kg); the highlight reinforced resin is a compound of PMMA (polymethyl methacrylate) resin and PC (polycarbonate) resin in a weight ratio of (3: 1)-(2: 1); the composite highlight additive is a compound of silicone master batch and PTFE (Polytetrafluoroethylene) wax in a weight ratio of 2: 1. According to the scheme, PMMA and PC are compounded to serve as highlight reinforced resin, silicone master batch and PTFE wax are matched to compound a highlight auxiliary, the light reflection capacity and the surface smoothness of a system are synergistically improved, the surface glossiness of a finished product can reach 95 or above (detected at the angle of 60 degrees), the problem of migration and precipitation is avoided, and the glossiness is stable after long-term use.

Description

Technical Field

[0001] This application relates to the field of polymer material modification technology, and in particular to a modified plastic particle that can enhance high gloss. Background Technology

[0002] With the rapid development of industries such as home appliances, automobiles, and consumer electronics, the market's requirements for the appearance quality of plastic products are increasing, and high gloss has become one of the core indicators of high-end plastic products. High-gloss plastic products can avoid subsequent painting processes, which not only reduces environmental pollution and production costs, but also improves the wear resistance and service life of the products, and has broad application prospects in the field of paint-free materials.

[0003] Currently, common methods for improving the gloss of plastics include raw material blending modification, adding high-gloss additives, and optimizing processing technology. Among these, blending base resins such as ABS and PP with PMMA (polymethyl methacrylate) can significantly improve gloss. However, PMMA has poor compatibility with most base resins, and simple blending easily leads to phase separation, surface defects, and a decrease in mechanical properties. Adding functional fillers such as pearlescent powder and fluorescent additives can enhance gloss, but these fillers are prone to agglomeration and uneven dispersion, which negatively impacts surface smoothness. Traditional lubricants and high-gloss agents such as zinc stearate and ordinary silicone oil pose a risk of migration and precipitation, which can lead to surface loss of gloss and whitening with long-term use. Furthermore, existing manufacturing processes suffer from problems such as unreasonable raw material mixing order and poor matching of extrusion temperature and speed parameters, resulting in incomplete resin melting and uneven additive dispersion, further limiting gloss improvement. Therefore, developing a high-gloss modified plastic granule with good formulation synergy, stable and long-lasting gloss, balanced mechanical properties, and a simple and controllable manufacturing process has become an urgent need in the industry. Summary of the Invention

[0004] To address the problems mentioned in the background art, this application provides a modified plastic particle that can enhance high gloss.

[0005] The modified plastic granules that enhance high gloss and their preparation process provided in this application adopt the following technical solution:

[0006] A modified plastic granule for enhancing high gloss comprises the following raw materials in parts by weight: 50-70 parts base resin, 20-30 parts high-gloss reinforcing resin, 2-5 parts compatibilizer, 1-3 parts composite high-gloss additive, 0.3-0.8 parts antioxidant, 0.5-1.2 parts dispersant, and 0.4-0.6 parts light stabilizer; wherein the base resin is ABS resin with a melt flow rate of 2-5 g / 10 min (220℃, 10 kg); the high-gloss reinforcing resin is a blend of PMMA resin and PC resin in a weight ratio of 3:1-2:1; and the composite high-gloss additive is a blend of silicone masterbatch and PTFE wax in a weight ratio of 2:1.

[0007] Preferably, the melt flow rate of the PMMA resin is 1-3 g / 10 min (230°C, 3.8 kg), and the melt flow rate of the PC resin is 5-10 g / 10 min (300°C, 1.2 kg).

[0008] Preferably, the compatibilizer is a styrene-maleic anhydride copolymer, and the maleic anhydride content is 8-12%.

[0009] Preferably, the antioxidant is a compound of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2.

[0010] 7. A process for preparing modified plastic particles that enhance high gloss, comprising the following steps:

[0011] 1) Raw material pretreatment: Place the base resin and high-gloss reinforced resin in an oven at 80-90℃ and dry for 2-3 hours;

[0012] 2) Premixing: Put the dried base resin, high-gloss reinforcing resin and compatibilizer into a high-speed mixer and mix for 8-10 minutes at 150-180 r / min and 60-70℃.

[0013] 3) Secondary mixing: Add composite high-gloss additive, antioxidant, dispersant, and light stabilizer, and mix at 240-260 r / min and 60-70℃ for 12-15 minutes;

[0014] 4) Melt extrusion granulation: The mixture is fed into a twin-screw extruder with temperatures of 180-190℃, 200-210℃, 220-230℃, and 210-220℃ in each section, a screw speed of 360-400 rpm, and a vacuum degree of -0.08~-0.09 MPa. After extrusion, the mixture is water-cooled and pelletized.

[0015] 5) Finished product post-processing: The granules are dried in an oven at 70-80℃ for 1-2 hours and then screened to obtain the finished product.

[0016] In summary, this application includes the following beneficial technical effects:

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. Excellent and long-lasting gloss: By using PMMA and PC as high-gloss reinforcing resins, combined with silicone masterbatch and PTFE wax composite high-gloss additives, the light reflection ability and surface smoothness of the system are synergistically improved. The surface gloss of the finished product can reach over 95 (60° angle test), and there is no migration or precipitation problem. The gloss is stable with long-term use.

[0019] 2. Balanced mechanical properties: By using SMA compatibilizer to improve the interfacial compatibility of each resin phase, and PC resin to enhance the rigidity of the system, the problem of decreased mechanical properties of traditional high-gloss modified plastics is solved. The finished product has an impact strength ≥25kJ / m² and a tensile strength ≥45MPa, which meets the requirements of structural components in home appliances, automobiles and other fields.

[0020] 3. Excellent processing performance: The optimized raw material ratio and preparation process result in good granule melt flowability, stable extrusion molding process, and no defects such as bubbles and scratches. It can be directly used for injection molding, extrusion and other processing without the need for subsequent spraying treatment, which reduces production costs and environmental pollution.

[0021] 4. Excellent aging resistance: The combination of antioxidants and light stabilizers effectively inhibits oxidative aging and photoaging. After a 70℃×48h heat aging test, the finished product does not show yellowing or loss of gloss, and its weather resistance is significantly improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a modified plastic particle that can enhance high gloss and its preparation process according to an embodiment of the present invention; Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0024] This application discloses a modified plastic particle that can enhance high gloss, which is composed of the following raw materials in parts by weight: 50-70 parts of base resin, 20-30 parts of high gloss reinforcing resin, 2-5 parts of compatibilizer, 1-3 parts of composite high gloss additive, 0.3-0.8 parts of antioxidant, 0.5-1.2 parts of dispersant, and 0.4-0.6 parts of light stabilizer.

[0025] Furthermore, the base resin is ABS resin with a melt flow rate (MFR) of 2-5 g / 10 min (220℃, 10 kg). The use of high-rigidity ABS resin can ensure the basic mechanical properties of the product.

[0026] The high-gloss reinforced resin is a blend of PMMA resin and PC resin in a weight ratio of 3:1 to 2:1. The MFR of PMMA resin is 1-3 g / 10 min (230℃, 3.8 kg), which has excellent light transmittance and gloss and can significantly improve the surface light reflection ability of the composite system. The MFR of PC resin is 5-10 g / 10 min (300℃, 1.2 kg), which can enhance the rigidity and heat resistance of the system, while also helping to improve gloss. The blend of the two can achieve synergistic optimization of gloss and mechanical properties.

[0027] The compatibilizer is styrene-maleic anhydride copolymer (SMA), with a maleic anhydride content of 8-12%. It can effectively improve the interfacial compatibility between ABS, PMMA and PC, eliminate phase separation, improve system uniformity, and ensure stable surface gloss.

[0028] The composite high-gloss additive is a mixture of silicone masterbatch and polytetrafluoroethylene (PTFE) wax in a weight ratio of 2:1. The silicone masterbatch can reduce the surface tension of the melt, improve the smoothness and gloss of the product surface, and has low migration. The PTFE wax has both lubricating and high-gloss functions, which can reduce the friction between the melt and the mold, avoid surface scratches, and enhance the gloss durability.

[0029] The antioxidant is a compound of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2, which can effectively inhibit the oxidative aging of the resin during processing and use, and prevent the surface from yellowing and losing its gloss.

[0030] The dispersant is a compound composition of sodium methylene dinaphthalene sulfonate and ammonium polymethacrylate, with a weight ratio of 0.3-0.6:0.2-0.4. It can significantly improve the dispersion uniformity of composite high-gloss additives and fillers in the system, prevent agglomeration and deposition, and ensure surface smoothness.

[0031] The light stabilizer is a benzotriazole light stabilizer (such as UV-327), which can improve the light aging resistance of the product and avoid gloss decay caused by long-term light exposure.

[0032] The present invention also provides a process for preparing the above-mentioned modified plastic particles that can enhance high gloss, comprising the following steps:

[0033] 1. Raw material pretreatment: Place the base resin and high-gloss reinforcing resin in an 80-90℃ oven for 2-3 hours to remove moisture and avoid air bubbles during processing that could affect surface gloss; seal and store the composite high-gloss additives, compatibilizers, antioxidants, dispersants, and light stabilizers at room temperature for later use.

[0034] 2. Premixing: Put the dried base resin, high-gloss reinforcing resin and compatibilizer into a high-speed mixer and mix for 8-10 minutes at a speed of 150-180 r / min and a temperature of 60-70℃ to initially disperse the materials evenly, laying the foundation for subsequent compatibility reactions.

[0035] 3. Secondary mixing: Add the composite high-gloss additive, antioxidant, dispersant and light stabilizer to the high-speed mixer, adjust the speed to 240-260 r / min, maintain the temperature at 60-70℃, and continue mixing for 12-15 minutes to ensure that the additives are evenly dispersed in the resin system and avoid local concentrations that are too high or too low.

[0036] 4. Melt Extrusion Granulation: The uniformly mixed material is fed into a twin-screw extruder for melt compounding and extrusion. The temperature settings for each section of the twin-screw extruder are as follows: feeding section 180-190℃, compression section 200-210℃, melting section 220-230℃, and die head section 210-220℃. The screw speed is 360-400 rpm, and the vacuum degree is controlled at -0.08~-0.09 MPa. Through precise temperature and speed control, the resin is fully melted and the additives play their full role. After the extruded material is cooled to room temperature by water cooling, it is cut into granules with a particle size of 2-3 mm by a pelletizer.

[0037] 5. Finished product post-processing: Place the cut granules in a 70-80℃ oven to dry for 1-2 hours to remove surface moisture, and screen to remove impurities and unqualified granules to obtain the finished modified plastic granules.

[0038] The implementation principle of one embodiment of this application is as follows: The core of achieving high gloss enhancement and comprehensive performance optimization of the modified plastic particles in this application lies in the synergistic effect of each raw material component and the precise adaptation of the preparation process. Through three core mechanisms—interfacial compatibility control, surface defect elimination, and synergistic performance improvement—a balance is achieved between gloss, mechanical properties, weather resistance, and processing performance. The specific working principle is as follows: The base resin is high-rigidity ABS resin (MFR 2-5g / 10min), providing a stable mechanical performance substrate for the product. Its molecular chain structure combines rigidity and toughness, avoiding the attenuation of mechanical properties after high-gloss modification. The high-gloss reinforcing resin is a blend of PMMA and PC (3:1-2:1). PMMA, with its excellent light transmittance and high refractive index, can improve the light reflection efficiency of the system, while PC enhances the heat resistance and structural stability of the system through molecular chain rigidity. The blend of the two can compensate for the defects of a single high-gloss resin, ensuring mirror-level gloss while avoiding the problems of poor impact resistance of PMMA and limited gloss enhancement of PC. The compatibilizer selected is SMA with a maleic anhydride content of 8-12%. Its molecular chains can form hydrogen bonds and covalent bonds with the styrene segments of ABS, the methacrylate segments of PMMA, and the carbonate segments of PC, effectively reducing interfacial tension, eliminating phase separation between components, and ensuring that the high-gloss reinforced resin is uniformly dispersed in the ABS matrix. This avoids surface defects such as pitting and haze caused by uneven dispersion, ensuring gloss stability. The composite high-gloss additive uses a blend of silicone masterbatch and PTFE wax (2:1). The silicone masterbatch reduces melt surface tension, improves the surface smoothness of the product, and reduces light scattering; the PTFE wax has both lubricating and high-gloss functions, reducing friction between the melt and the mold, preventing processing scratches, and enhancing gloss durability. Together, they achieve a simultaneous improvement in surface gloss and processing smoothness. Antioxidant (1010:168=1:2), light stabilizer (UV-327), and dispersant (sodium methylene dinaphthalene sulfonate: ammonium polymethacrylate=0.3-0.6:0.2-0.4) form a functional protective system. The dispersant prevents the aggregation of components such as composite high-gloss additives, ensuring the uniformity of the system; the antioxidant inhibits resin oxidation and yellowing during processing and use, and the light stabilizer delays gloss decay under long-term light exposure, jointly ensuring the long-term gloss and performance stability of the product. In terms of the preparation process, pretreatment and segmented mixing, through precise temperature and speed control, ensure that the raw materials are dry and free of moisture, and that the components are uniformly dispersed; melt extrusion, through segmented temperature control (feeding section 180-190℃ to die head section 210-220℃) and speed matching (360-400rpm), achieves complete resin melting and full action of additives; subsequent drying and screening further eliminate surface defects, ultimately obtaining high-gloss, high-performance modified plastic granules.

[0039] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0040] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0041] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modified plastic granule that enhances high gloss, characterized in that, It is composed of the following raw materials in parts by weight: 50-70 parts base resin, 20-30 parts high-gloss reinforcing resin, 2-5 parts compatibilizer, 1-3 parts composite high-gloss additive, 0.3-0.8 parts antioxidant, 0.5-1.2 parts dispersant, and 0.4-0.6 parts light stabilizer; the base resin is ABS resin with a melt flow rate of 2-5 g / 10 min (220℃, 10 kg); the high-gloss reinforcing resin is a compound of PMMA resin and PC resin with a weight ratio of 3:1-2:1; the composite high-gloss additive is a compound of silicone masterbatch and PTFE wax with a weight ratio of 2:

1.

2. The modified plastic granules for enhancing high gloss according to claim 1, characterized in that, The melt flow rate of the PMMA resin is 1-3 g / 10 min (230℃, 3.8 kg), and the melt flow rate of the PC resin is 5-10 g / 10 min (300℃, 1.2 kg).

3. The modified plastic granules for enhancing high gloss according to claim 1, characterized in that, The compatibilizer is a styrene-maleic anhydride copolymer with a maleic anhydride content of 8-12%.

4. The modified plastic granules for enhancing high gloss according to claim 1, characterized in that, The antioxidant is a compound of antioxidant 1010 and antioxidant 168, with a weight ratio of 1:

2.

5. The modified plastic granules for enhancing high gloss according to claim 1, characterized in that, The dispersant is a compound composition of sodium methylene dinaphthalene sulfonate and ammonium polymethacrylate, with a weight ratio of 0.3-0.6:0.2-0.

4.

6. The modified plastic granules for enhancing high gloss according to claim 1, characterized in that, The light stabilizer is a benzotriazole light stabilizer.

7. A process for preparing modified plastic particles with enhanced high gloss as described in any one of claims 1-6, characterized in that, Includes the following steps: 1) Raw material pretreatment: Place the base resin and high-gloss reinforced resin in an oven at 80-90℃ and dry for 2-3 hours; 2) Premixing: Put the dried base resin, high-gloss reinforcing resin and compatibilizer into a high-speed mixer and mix for 8-10 minutes at 150-180 r / min and 60-70℃. 3) Secondary mixing: Add composite high-gloss additive, antioxidant, dispersant, and light stabilizer, and mix at 240-260 r / min and 60-70℃ for 12-15 minutes; 4) Melt extrusion granulation: The mixture is fed into a twin-screw extruder with temperatures of 180-190℃, 200-210℃, 220-230℃, and 210-220℃ in each section, a screw speed of 360-400 rpm, and a vacuum degree of -0.08~-0.09 MPa. After extrusion, the mixture is water-cooled and pelletized. 5) Finished product post-processing: The granules are dried in an oven at 70-80℃ for 1-2 hours and then screened to obtain the finished product.

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