Glass fiber reinforced environmentally friendly plastic and its production process and equipment

Abstract

The present invention discloses a glass fiber reinforced environmentally friendly plastic and its production process and equipment, which relate to the technical field of glass fiber reinforced plastics. A production equipment for producing glass fiber reinforced environmentally friendly plastics, comprising a main extruder and several groups of side fiber feeding mechanisms, wherein the melting section of the main extruder is provided with several groups of combined barrels, and the several groups of side fiber feeding mechanisms correspond to and are connected to the several groups of combined barrels, and the side fiber feeding mechanisms are used to transport chopped fibers into the melting section of the main extruder. By utilizing the side fiber feeding mechanism to feed the chopped fibers, the production equipment can fully adapt to the production process of adding chopped fibers, and thus can optimize the production process of glass fiber reinforced plastics. The optimized production process uses chopped fibers instead of long fibers, which is not only conducive to reducing costs, but also can effectively reduce labor costs and improve production efficiency when the optimized production process is prepared using the above-mentioned production equipment.

Description

Technical Field

[0001] The present invention relates to the field of glass fiber reinforced plastics, and in particular to a glass fiber reinforced environmentally friendly plastic and a production process and equipment thereof. Background Art

[0002] At present, in the production of fiber-reinforced plastic pellets, screw extruders are generally used as the main equipment for pellet production. Through the rotation of the screw, the plastic masterbatch can be fully mixed with the reinforcing fiber and extruded into pellets together.

[0003] Because plastic masterbatch has a high hardness when not fully melted, it generates significant friction and shear forces in the feed section as the screw rotates. If reinforcing fibers are fed directly into the feed port of the screw extruder along with the plastic masterbatch, the immense friction and shear forces generated by the masterbatch will wear off or even pulverize the reinforcing fibers, significantly reducing their reinforcing effect. Therefore, in existing techniques, workers manually feed the long reinforcing fibers into the vent of the melting section. This allows the reinforcing fibers to be directly mixed into the plastic melt and minimizes wear and tear on the reinforcing fibers.

[0004] Due to the high price of long fibers, in order to reduce production costs, they are usually replaced with lower-cost chopped fibers. However, due to the low volume density of chopped fibers, they are prone to accumulation at the exhaust port when added directly, affecting exhaust. Therefore, workers need to feed them continuously and slowly. Not only is the labor intensity high and the overall production efficiency low, but the stability and uniformity during manual feeding are also not high. Uneven mixing can easily lead to unstable or even substandard quality of the finished product. The finished product is also difficult to be directly used in downstream plastic molding and extrusion, indirectly increasing the company's operating costs.

[0005] At the same time, during the process of mixing and conveying the chopped fibers with the plastic masterbatch in the main extruder, problems such as fluffiness and low heat conduction efficiency are prone to occur. Not only are the chopped fibers easily carried away by the air, but they are also easily adsorbed on the joints of the feed pipe or furnace wall to form carbon deposits, leading to technical problems such as uneven feeding and low product quality. Summary of the Invention

[0006] In order to improve the production equipment of glass fiber reinforced plastics, optimize the production process, and thereby reduce the labor intensity of staff, improve production efficiency, and reduce internal costs, the present application provides a glass fiber reinforced environmentally friendly plastic and its production process and equipment.

[0007] In the first aspect, the present application provides a glass fiber reinforced environmentally friendly plastic production equipment adopting the following technical solutions:

[0008] A glass fiber reinforced environmentally friendly plastic production equipment includes a main extruder and several groups of side fiber feeding mechanisms. The melting section of the main extruder is provided with several groups of combined barrels. Several groups of the combined barrels are arranged in sequence along the extension direction of the main extruder. Several groups of the side fiber feeding mechanisms correspond to several groups of the combined barrels. A side feed port connected to the interior is opened on one side of the combined barrel. The side fiber feeding mechanism is connected to the interior of the melting section of the main extruder through the side feed port of the combined barrel. The side fiber feeding mechanism is used to transport chopped fibers to the inside of the melting section of the main extruder.

[0009] By adopting the above technical solution, a plurality of side-feeding fiber mechanisms are used to feed a variety of chopped fibers, so that the production equipment can fully adapt to the production process of adding chopped fibers, and then the production process of glass fiber reinforced plastics can be optimized according to the production equipment. The optimized production process can use chopped fibers instead of long fibers, which is beneficial to reducing raw material costs. Secondly, when the plastic formula contains chopped fibers, the production equipment is used for production, which not only eliminates the need for workers to pre-mix and feed the chopped fibers, but also reduces the workload of the workers and improves production efficiency. Moreover, by precisely controlling the feeding speed of the side-feeding fiber mechanism, it can also prevent the chopped fibers from piling up or becoming too fluffy in the main extruder, which is beneficial to achieving uniform transportation and sufficient mixing of the chopped fibers, and ensuring the product quality of the resulting plastic products.

[0010] Optionally, the side fiber feeding mechanism includes a mixing hopper, an auxiliary material pipe, a quantitative component, a first feeding module and a second feeding module, wherein the first feeding module is connected to the mixing hopper and the auxiliary material pipe, and the second feeding module is connected to the auxiliary material pipe and the main extruder, wherein the first feeding module is driven by a motor to achieve conveying by a spiral fan blade, and the second feeding module is driven by a motor to achieve conveying by a twin-screw;

[0011] The mixing hopper is provided with a stirring assembly for stirring the chopped fibers and a hot air blower for drying. The quantitative assembly is arranged on one side of the mixing hopper. The quantitative assembly includes a storage tank for storing the additive and a metering pump for quantitatively delivering the additive. The storage tank is connected to the interior of the mixing hopper through the metering pump.

[0012] By adopting the above technical solution, the chopped fibers can be quantitatively delivered from the mixing hopper to the auxiliary feed pipe through the first feeding module, and then quantitatively delivered from the auxiliary feed pipe to the main extruder through the second feeding module. Not only does the entire feeding process require no staff participation, but it also ensures the uniformity and stability of the chopped fibers during delivery. In addition, the side fiber feeding mechanism can also modify the chopped fibers that require surface modification directly in the mixing hopper through the interaction between the quantitative component, the stirring component, and the hot air blower, eliminating the need for staff to repeatedly transfer the chopped fibers before and after modification, which helps reduce staff labor intensity and save labor costs.

[0013] Optionally, the auxiliary material pipe is in the shape of an inverted trapezoid that is wider at the top and narrower at the bottom, the discharge port of the first feeding module is connected to the top of the auxiliary material pipe, and the bottom of the auxiliary material pipe extends vertically downward and is connected to the second feeding module; the top of the auxiliary material pipe is also provided with an observation port, and a cover is provided for covering the observation port.

[0014] By adopting this technical solution, the auxiliary feed pipe can serve as a buffer and redistribution mechanism for the chopped fibers, improving the uniformity and stability of the chopped fibers during feeding. Furthermore, staff can monitor the accumulation of chopped fibers in the second feed module through the observation port and promptly adjust the motor speed and frequency of the first and second feed modules to ensure a uniform delivery of chopped fibers. The cover also helps prevent large debris such as sand and gravel from falling into the auxiliary feed pipe, preventing blockage or damage to the second feed module.

[0015] Optionally, a combined screw module is provided inside the main extruder, and the screw module includes a shaft and several groups of threaded elements and shearing elements sleeved on the circumference of the shaft, wherein the shearing element is sleeved on a section of the circumference of the shaft located inside the combined barrel, and the threaded element is sleeved on the circumference of the remaining part of the shaft, and the threaded elements have different leads and thread directions corresponding to different parts of the main extruder.

[0016] By adopting this technical solution, the modular screw module can flexibly select and combine various threaded and shearing elements according to different processing requirements, helping to adapt the production equipment to the characteristics of different raw materials and different production processes. By properly arranging the threaded and shearing elements, the plastic masterbatch and chopped fibers are fully mixed in the main extruder. This not only allows the use of lower-cost chopped fibers instead of long fibers, but also prevents the chopped fibers from being further sheared and crushed during the mixing process, which helps to ensure the quality of the finished plastic product.

[0017] Optionally, the shearing element is composed of a plurality of kneading blocks, and the staggered angle between adjacent kneading blocks is 45°-60°.

[0018] By adopting the above technical solution, when the staggered angle of the kneading blocks is between 45° and 60°, the residence time of the plastic masterbatch and the chopped fibers in the melting section can be appropriately extended, which is beneficial to improving the distribution and mixing effect of the chopped fibers in the molten plastic masterbatch. At the same time, the shear force generated by the shearing element is relatively small, which can effectively prevent the chopped fibers from being further sheared and crushed during the mixing process, thereby ensuring the reinforcement effect of the chopped fibers.

[0019] Optionally, an exhaust port connected to the interior is opened on the top side of the combined barrel, and an air guide plate is provided on one side of the exhaust port. The air guide plate extends downwardly and obliquely toward the feeding direction of the main extruder, and a long fiber guide roller is provided on the side of the exhaust port away from the air guide plate.

[0020] By adopting the above technical solution, the provision of an exhaust port and an air deflector extending obliquely downward in the feed direction not only guides the discharge of gases entrained by the material in the main extruder, but also prevents the material from overflowing from the exhaust port during conveying or mixing. Furthermore, the provision of long-fiber guide rollers enables the production equipment to produce plastics using traditional long-fiber addition processes. This not only improves the versatility of the production equipment but also eliminates the need for additional staff to guide the long fibers into the main extruder, reducing worker workload and labor costs.

[0021] In a second aspect, the present application provides a glass fiber reinforced environmentally friendly plastic production process using the following technical solutions:

[0022] A glass fiber reinforced environmentally friendly plastic production process, suitable for the above-mentioned production equipment, comprises the following steps:

[0023] S1, stirring and mixing the components in the plastic masterbatch, and then adding them to the main extruder;

[0024] S2, treating the chopped fibers with water and then drying them thoroughly, and then adding them to the mixing hopper of the side fiber feeding mechanism;

[0025] S3, feeding the chopped fibers into the melting section of the main extruder through the side fiber feeding mechanism, fully melting and blending the plastic masterbatch and the chopped fibers through the main extruder, and extruding the plastic masterbatch and the chopped fibers. After extrusion, the plastic is water-cooled, dried, and granulated to obtain a glass fiber-reinforced environmentally friendly plastic.

[0026] The temperature of the main extruder is set to 200-260° C., the main extruder speed is 380-400 r / min, the feeding speed is 25-35 r / min, and the motor speed frequency of the second feeding module of the side fiber feeding mechanism is 12-42 Hz.

[0027] Optionally, the plastic masterbatch includes the following raw materials in parts by weight:

[0028] Plastic main material: 100-150 parts;

[0029] Maleic anhydride grafted polyethylene: 3-8 parts;

[0030] Impact modifier: 2.5-5 parts;

[0031] Antioxidant: 0.2-0.3 parts;

[0032] Wherein, the main plastic material is a mixture of one or more of ABS resin and AS resin;

[0033] Calculated based on the total weight of the plastic main material, the chopped fibers include the following raw materials:

[0034] First staple fiber: 22-24%;

[0035] Second staple fiber: 6-8%;

[0036] The monofilament diameter of the first staple fiber is 17-24 μm, the monofilament diameter of the second staple fiber is 13-15 μm, and the lengths of the first staple fiber and the second staple fiber are 20-25 mm.

[0037] By adopting the above technical solution and using short-cut fibers instead of traditional long fibers, not only can the raw material cost be greatly reduced, but the short-cut fibers can also use recycled regenerated short fibers, rationally utilizing waste resources and having certain green and environmental protection properties.

[0038] Optionally, the side fiber feeding mechanisms are provided in two groups, and the side fiber feeding mechanisms of the first group are located on a side of the side fiber feeding mechanisms of the second group away from the feeding section of the main extruder;

[0039] Among them, the first staple fiber is added to the mixing hopper of the first group of side fiber feeding mechanisms, and the motor speed frequency of the second feeding module in the first group of side fiber feeding mechanisms is 38-42Hz; the second staple fiber is added to the mixing hopper of the second group of side fiber feeding mechanisms, and the speed frequency of the first feeding module and the second feeding module in the second group of side fiber feeding mechanisms is 12-18Hz.

[0040] By adopting the above technical solution, the motor speed frequency of the second feeding module of the two sets of side fiber feeding mechanisms is controlled separately, which can effectively adjust the feeding speed of two different chopped fibers. This is not only conducive to ensuring that the two chopped fibers can be added to the main extruder in proportion and preventing the uneven distribution of the two chopped fibers, but also convenient for adjusting the overall performance of the finished plastic product and ensuring the stable product quality of the finished plastic product. In addition, multiple sets of side fiber feeding mechanisms are set according to the type and quantity of the chopped fibers to feed them separately, without the need for staff to pre-mix the materials, which is conducive to reducing labor costs.

[0041] In a third aspect, the present application provides a glass fiber reinforced environmentally friendly plastic that adopts the following technical solutions:

[0042] A glass fiber reinforced environmentally friendly plastic is prepared using the above-mentioned production equipment and production process.

[0043] In summary, the technical solution of this application has at least one of the following beneficial effects:

[0044] 1. By using the side fiber feeding mechanism to feed the chopped fibers, the staff does not need to pre-mix and feed the chopped fibers, which helps to reduce the workload of the staff and improve production efficiency.

[0045] 2. By optimizing the production process according to the production equipment, the optimized production process can use short-cut fibers instead of long fibers, which is beneficial to greatly reduce the cost of raw materials.

[0046] 3. For the plastic production process containing multiple chopped fibers, a side fiber feeding mechanism that matches the number of chopped fibers is set up to feed each type of chopped fiber separately. This is not only conducive to ensuring that multiple chopped fibers can be added to the main extruder in proportion to prevent uneven distribution, but also convenient for adjusting the overall performance of the finished plastic product, which is conducive to ensuring the stable product quality of the finished plastic product. In addition, there is no need for staff to pre-mix the materials, which is conducive to reducing labor costs.

[0047] 4. Reasonable setting of the screw elements and shearing elements of the screw module can help fully mix the plastic masterbatch and chopped fibers in the main extruder. It can also prevent the chopped fibers from being further sheared and crushed during the mixing process, which is beneficial to ensure the quality of the finished plastic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a structural diagram of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application.

[0049] Figure 2This is a partial structural diagram of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application, in which the side fiber feeding mechanism and the main extruder are in a separated state.

[0050] Figure 3 This is a cross-sectional view of a side fiber feeding mechanism of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application.

[0051] Figure 4 This is a partial structural diagram of the main extruder of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application, in which part of the closed barrel and the combined barrel are hidden.

[0052] Figure 5 This is a structural schematic diagram of a combined barrel of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application.

[0053] Figure 6 This is a cross-sectional view of a combined barrel of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application.

[0054] Description of reference numerals:

[0055] 1. Main extruder; 11. Closed barrel; 12. Combined barrel; 121. Side feed port; 122. Exhaust port; 123. Air guide plate; 124. Long fiber guide roller; 13. Screw module; 131. Threaded element; 132. Shearing element; 1321. Kneading block; 2. Side fiber feeding mechanism; 21. Mixing hopper; 22. Auxiliary material pipe; 221. Observation port; 222. Cover; 23. Dosing assembly; 231. Storage tank; 232. Metering pump; 24. First feeding module; 25. Second feeding module; 26. Stirring assembly; 261. Stirring rod; 262. Stirring motor; 27. Hot air blower. DETAILED DESCRIPTION

[0056] The following is combined with Figure 1-6 , Examples and Comparative Examples further illustrate this application in detail. Example

[0057] [Example 1]

[0058] The present application discloses a glass fiber reinforced environmentally friendly plastic production equipment. Figure 1 and Figure 2A glass fiber reinforced environmentally friendly plastic production equipment includes a main extruder 1 and several groups of side fiber feeding mechanisms 2, wherein the main extruder 1 includes several groups of closed barrels 11 and combined barrels 12, and the several groups of closed barrels 11 and combined barrels 12 are arranged in sequence. The barrels and combined barrels 12 are internally provided with screw modules 13 for conveying materials. The main extruder 1 is divided into a feeding section, a melting section and a mixed extrusion section according to the material conveying state, and the several groups of combined barrels 12 are specifically arranged in the melting section. Several groups of side fiber feeding mechanisms 2 correspond to and are connected to several groups of combined barrels 12 one by one. A side feed port 121 connected to the interior is opened on one side of the combined barrel 12. The side fiber feeding mechanism 2 is interconnected with the inside of the melting section of the main extruder 1 through the side feed port 121, and is used to convey chopped fibers to the inside of the melting section of the main extruder 1. Furthermore, the number of combined barrels 12 and side fiber feeding mechanisms 2 is determined according to the required environmentally friendly plastic formula.

[0059] Reference Figure 2 and Figure 3 The side fiber feeding mechanism 2 includes a mixing hopper 21, an auxiliary material pipe 22, a quantitative component 23, a first feeding module 24 and a second feeding module 25, wherein the mixing hopper 21 is used to store the chopped fibers; the auxiliary material pipe 22 is used to ensure that the chopped fibers can be evenly and continuously transported; the quantitative component 23 is used to quantitatively add additives to the mixing hopper 21, and thereby modify the chopped fibers in the mixing hopper 21; the first feeding module 24 realizes the feeding of the chopped fibers by driving the spiral blades through the motor. The first feeding module 24 is connected to the mixing hopper 21 and the auxiliary material pipe 22, and the second feeding module 25 is connected to the auxiliary material pipe 22 and the side feed port 121 of the combined barrel 12, so that the chopped fibers can be quantitatively delivered from the mixing hopper 21 to the auxiliary material pipe 22 through the first feeding module 24, and then quantitatively delivered from the auxiliary material pipe 22 to the main extruder 1 through the second feeding module 25.

[0060] Reference Figure 2 and Figure 3 The mixing hopper 21 is provided with a stirring assembly 26 for stirring and mixing the internal chopped fibers and a hot air blower 27 for hot air drying, wherein the stirring assembly 26 includes a stirring rod 261 and a stirring motor 262. A quantitative assembly 23 is provided on one side of the mixing hopper 21. The quantitative assembly 23 includes a storage tank 231 for storing an additive and a metering pump 232 for quantitatively delivering the additive. The storage tank 231 and the metering pump 232 are connected to the interior of the mixing hopper 21 through a pipeline. Therefore, when chopped fibers with poor surface properties are added to the mixing hopper 21, a surface modification additive can be added to the mixing hopper 21 through the quantitative assembly 23. In combination with the stirring assembly 26 and the hot air blower 27, a simple mixing and modification of the surface of the chopped fibers can be achieved.

[0061] Reference Figure 2 and Figure 3 The auxiliary feed pipe 22 has an inverted trapezoidal structure, wide at the top and narrow at the bottom. The outlet of the first feed module 24 is connected to the top of the auxiliary feed pipe 22, and the bottom of the auxiliary feed pipe 22 extends vertically downward and connects to the second feed module 25. Because the second feed module 25 needs to adjust the motor speed frequency to change the feeding speed according to the processing conditions, the auxiliary feed pipe 22 can serve as a buffer for the chopped fibers, which helps to ensure more uniform and stable transportation of the chopped fibers. In addition, the top of the auxiliary feed pipe 22 is provided with an observation port 221 and a cover 222 for covering the observation port 221. This allows workers to monitor the accumulation of the chopped fibers through the observation port 221 and promptly adjust the motor speed frequency of the first and second feed modules 24 and 25 to ensure stable transportation of the chopped fibers. The cover 222 helps prevent large sand and debris from falling into the auxiliary feed pipe 22, preventing blockage or damage to the second feed module 25.

[0062] Reference Figure 4 In this embodiment, the screw module 13 of the main extruder 1 is a combined screw. Specifically, the screw module 13 includes a shaft and several groups of threaded elements 131 and shearing elements 132 sleeved on the circumference of the shaft, wherein the threaded element 131 is mainly sleeved on the circumference of the shaft located inside the closed barrel 11, and the shearing element 132 is mainly sleeved on the circumference of the shaft located inside the combined barrel 12.

[0063] Reference Figure 4 The lead and thread direction of the threaded elements 131 provided on different parts of the shaft corresponding to the main extruder 1 are different. Specifically, the part of the shaft corresponding to the feeding section of the main extruder 1 is provided with a threaded element 131 with a large lead and a positive right-hand rotation; the part of the shaft corresponding to the melting section of the main extruder 1 is provided with a threaded element 131 with a medium lead and a positive right-hand rotation, as well as a small number of threaded elements 131 with a medium lead and a reverse left-hand rotation; the part of the shaft corresponding to the melting section of the main extruder 1 is provided with a threaded element 131 with a small lead and a positive right-hand rotation.

[0064] Reference Figure 4The shearing element 132 is specifically composed of a plurality of kneading blocks 1321 arranged in sequence. In this embodiment, the staggered angle between adjacent kneading blocks 1321 is 45°. In other embodiments, the staggered angle between adjacent kneading blocks 1321 can be adjusted and selected between 45° and 60°. This can appropriately extend the residence time of the plastic masterbatch and chopped fibers in the molten section, which is beneficial for improving the distribution and mixing effect of the chopped fibers in the molten plastic masterbatch. At the same time, the shearing force generated by the shearing element 132 is relatively small, which can effectively prevent the chopped fibers from being further sheared and crushed during the mixing process, thereby ensuring the reinforcement effect of the chopped fibers. In addition, a medium-lead, counter-left-handed threaded element 131 is located at the feed end of the shearing element 132 to cooperate with the shearing element 132 to extend the distribution and mixing time of the plastic masterbatch and chopped fibers.

[0065] Reference Figure 5 and Figure 6 The top side of the combined barrel 12 is also provided with an exhaust port 122 that is connected to the interior. An air guide plate 123 is provided on the side of the exhaust port 122 close to the feed section of the main extruder 1. The air guide plate 123 extends downwardly and obliquely toward the conveying direction of the main extruder 1 to prevent the plastic material inside the combined barrel 12 from overflowing from the exhaust port 122 during the conveying or mixing process. A long fiber guide roller 124 is rotatably provided on the side of the exhaust port 122 away from the air guide plate 123. The long fiber guide roller 124 is used to guide the long fibers from the exhaust port 122 into the main extruder 1. This not only enables the production equipment to prepare plastics according to the traditional production process of adding long fibers, but also eliminates the need for additional staff to guide the long fibers into the main extruder 1, which is beneficial to improving the versatility of the production equipment and reducing the labor intensity of the staff.

[0066] A glass fiber reinforced environmentally friendly plastic production process is applicable to the production of a glass fiber reinforced environmentally friendly plastic production equipment disclosed in this embodiment, and specifically includes the following steps:

[0067] S1, stirring and mixing the components in the plastic masterbatch, and then adding them to the main extruder 1;

[0068] S2, the chopped fibers are treated with water and then fully dried, and then added to the mixing hopper 21 of the side feeding mechanism;

[0069] S3. The chopped fibers are fed into the melting section of the main extruder 1 by a side feeding mechanism. The plastic masterbatch and the chopped fibers are fully mixed and extruded by the main extruder 1. The mixture is then water-cooled, dried, and granulated to obtain a glass fiber reinforced environmentally friendly plastic.

[0070] In this embodiment, the plastic masterbatch includes the following raw materials:

[0071] 150kg plastic main material, 8kg maleic anhydride grafted polyethylene, 5kg impact modifier, 0.3kg antioxidant.

[0072] The main plastic materials include 125kg ABS resin and 25kg AS resin, the specific brand of maleic anhydride grafted polyethylene is SMA-700, the impact modifier is MBS resin, and the antioxidants include 0.15kg antioxidant 1010 and 0.15kg antioxidant 168.

[0073] In this embodiment, the amount of chopped fibers added accounts for 30% of the weight of the main plastic material, including 33 kg of first staple fibers and 12 kg of second staple fibers. Specifically, the first staple fibers are staple fibers 388 with a monofilament diameter of 17-24 μm, and the second staple fibers are staple fibers 588B with a monofilament diameter of 13-15 μm. Both the first and second staple fibers are 25 mm in length.

[0074] Furthermore, in this embodiment, two groups of side feeding mechanisms are provided, wherein the first group of side fiber feeding mechanisms 2 is located on the side of the second group of side fiber feeding mechanisms 2 away from the feed section of the main extruder 1. Specifically, the first staple fiber is added to the mixing hopper 21 of the first group of side fiber feeding mechanisms 2, and the motor speed frequency of the second feeding module 25 in the first group of side fiber feeding mechanisms 2 is set to 38-40 Hz, and the second staple fiber is added to the mixing hopper 21 of the second group of side fiber feeding mechanisms 2, and the motor speed frequency of the second feeding module 25 in the second group of side fiber feeding mechanisms 2 is set to 15-18 Hz.

[0075] Furthermore, in this embodiment, the specific parameters of the main extruder 1 are as follows:

[0076]

[0077] A glass fiber reinforced environmentally friendly plastic is prepared by a glass fiber reinforced environmentally friendly plastic production device and production process disclosed in this embodiment.

[0078] [Example 2]

[0079] A glass fiber reinforced environmentally friendly plastic production process is suitable for production using a glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1]. The difference from [Example 1] lies in the difference in raw materials and equipment process parameters.

[0080] In this embodiment, the plastic masterbatch includes the following raw materials:

[0081] 100kg plastic main material, 2kg maleic anhydride grafted polyethylene, 2.5kg impact modifier, 0.2kg antioxidant.

[0082] The main plastic material is AS resin, the specific brand of maleic anhydride grafted polyethylene is SMA-800, the impact modifier is MBS resin, and the antioxidants include 0.1 kg antioxidant 1010 and 0.1 kg antioxidant 168.

[0083] In this embodiment, the chopped fibers account for 30% of the weight of the main plastic material, including 24 kg of first staple fibers and 6 kg of second staple fibers. Specifically, the first staple fibers are staple fibers 388 with a monofilament diameter of 17-24 μm, and the second staple fibers are staple fibers 588B with a monofilament diameter of 13-15 μm. Both the first and second staple fibers are 20 mm in length.

[0084] Furthermore, in this embodiment, the first staple fiber is added to the mixing hopper 21 of the first group of side fiber feeding mechanisms 2, and the motor speed frequency of the second feeding module 25 in the first group of side fiber feeding mechanisms 2 is set to 40-42 Hz, and the second staple fiber is added to the mixing hopper 21 of the second group of side fiber feeding mechanisms 2, and the motor speed frequency of the second feeding module 25 in the second group of side fiber feeding mechanisms 2 is set to 12-15 Hz.

[0085] Furthermore, in this embodiment, the specific parameters of the main extruder 1 are as follows:

[0086]

[0087] A glass fiber reinforced environmentally friendly plastic is prepared by a glass fiber reinforced environmentally friendly plastic production device and production process disclosed in this embodiment.

[0088] [Example 3]

[0089] A glass fiber reinforced environmentally friendly plastic production process is suitable for production using a glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1]. The difference from [Example 2] lies in the different feeding process of chopped fibers.

[0090] In this embodiment, the chopped fibers are the same as in Example 2, except that only one side feeding mechanism is provided. Specifically, the first and second staple fibers are premixed in a certain proportion and then added to the mixing hopper 21 of the side feeding mechanism 2. The feeding speed of the second feeding module 25 is the same as in Example 2.

[0091] [Example 4]

[0092] A glass fiber reinforced environmentally friendly plastic production process is applicable to the glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1], and the difference from [Example 2] lies in the difference in the second fiber in the chopped fiber.

[0093] In this embodiment, the second staple fibers are all regenerated fibers with a monofilament diameter of 13-15 μm, and the length of the second staple fibers is 20 mm.

[0094] Furthermore, the second fiber is treated with a surface modification agent before being delivered to the main extruder 1. Specifically, the surface modification agent is a silane coupling agent KH-570, and the addition amount is 0.2 kg. The surface modification agent is added to the storage tank 231 of the metering component 23 in the second set of side feeding mechanisms, and is quantitatively added to the mixing hopper 21 by the metering pump 232. With the stirring component 26 and the hot air blower 27, sufficient stirring and drying are carried out to obtain the surface-treated second staple fiber in the mixing hopper 21.

[0095] A glass fiber reinforced environmentally friendly plastic is prepared by a glass fiber reinforced environmentally friendly plastic production device and production process disclosed in this embodiment. Comparative Example

[0096] [Comparative Example 1]

[0097] A glass fiber reinforced plastic production process is suitable for production using a glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1]. The difference from [Example 1] is that chopped fibers are not added.

[0098] In this comparative example, long fibers are used instead of short fibers. Specifically, the long fibers are selected to have a monofilament diameter of 17-24 μm, and the long fibers are fed through the long fiber guide roller 124 of the exhaust port 122 in the main extruder 1.

[0099] [Comparative Example 2]

[0100] A glass fiber reinforced plastic production process is applicable to the glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1] for production. The difference from [Example 2] is that chopped fibers are not added.

[0101] In this comparative example, long fibers are used instead of short fibers. Specifically, the long fibers are selected to have a monofilament diameter of 17-24 μm, and the long fibers are fed through the long fiber guide roller 124 of the exhaust port 122 in the main extruder 1.

[0102] Performance test data

[0103] 1. Tensile strength: The tensile strength test was conducted with reference to GB / T 1040.4-2006 Determination of tensile properties of plastics Part 4: Experimental conditions for isotropic and orthotropic fiber-reinforced composite materials. The tensile speed was set at 50 mm / min, and the tensile strength (MPa) of the samples prepared in each Example and Comparative Example was recorded.

[0104] 2. Flexural strength: The flexural strength test was conducted with reference to GB / T 9341-2008 Plastics - Determination of Flexural Properties, with a bending span of 64 mm and a pressing speed of 2 mm / min. The flexural strength (MPa) of the samples prepared in each embodiment and comparative example was recorded.

[0105] 3. Impact strength: Refer to GB / T 1843-2008 Determination of Izod Beam Impact Strength of Plastics for testing, using a 2.75J pendulum and recording the notched impact strength (KJ / m 2 ).

[0106] Table 1 Mechanical properties test data of plastic parts

[0107]

[0108] Combining Examples 1-2 with Comparative Examples 1-2 and the data in Table 1, it can be seen that when the production process uses chopped fibers to reinforce plastic, the production equipment uses the side fiber feeding mechanism 2 to uniformly feed the chopped fibers, and the properties of the obtained plastic are comparable to those of the plastic obtained by the traditional process of using long fibers to reinforce plastic, and even some of the mechanical properties of the finished product are further improved. This shows that the improved production equipment can fully adapt to the production process of adding chopped fibers. When the production process contains chopped fibers, by setting up several groups of side fiber feeding mechanisms 2, not only is it unnecessary for the staff to pre-mix and feed the chopped fibers, which greatly reduces the workload of the staff, but also by controlling the feeding speed of the side fiber feeding mechanism 2 and reasonably setting the thread combination of the main extruder 1, it can also effectively prevent the chopped fibers from piling up or becoming too fluffy in the main extruder 1, which is conducive to achieving uniform transportation and sufficient mixing of the chopped fibers and ensuring the product quality of the obtained plastic product.

[0109] Combining Examples 2-3 and the data in Table 1, it can be seen that by utilizing two sets of side fiber feeding mechanisms 2 to feed the two chopped fibers separately, the performance of the obtained plastic finished product is improved compared to the production process of mixing the two chopped fibers in advance and then feeding them. This is because when the two chopped fibers are pre-blended in proportion, there may be uneven distribution of the two chopped fibers during the feeding process, that is, in the same feeding time, there may be a situation where the first short fiber content is high or the second short fiber content is high in the pre-mixed chopped fibers. By feeding separately through two sets of side fiber feeding mechanisms 2, it can be ensured that the two chopped fibers can be added to the main extruder 1 in proportion, and the above-mentioned uneven distribution can be prevented. This is not only conducive to ensuring the product quality of the obtained plastic finished product, but also conveniently adjusts the overall performance of the plastic finished product. In addition, there is no need for staff to pre-mix the materials, which reduces labor costs.

[0110] Combining the data of Example 2 and Example 4, it can be seen that through the mutual cooperation between the quantitative component 23, the stirring component 26 and the hot air blower 27, the recycled regenerated staple fibers can be directly surface-modified in the mixing hopper 21, and after the modification is completed, the modified regenerated staple fibers can be directly transported to the main extruder 1 without the need for staff to transfer them, thereby reducing the process complexity when adding recycled regenerated staple fibers, which is not only beneficial to reducing production costs, but also can reasonably utilize waste resources and has a certain degree of green environmental protection.

[0111] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A glass fiber reinforced environmentally friendly plastic production equipment, characterized by: The invention comprises a main extruder (1) and several groups of side fiber feeding mechanisms (2), wherein the melting section of the main extruder (1) is provided with several groups of combined barrels (12), and the several groups of combined barrels (12) are arranged in sequence along the extension direction of the main extruder (1), and the several groups of side fiber feeding mechanisms (2) correspond to the several groups of combined barrels (12), and one side of the combined barrel (12) is provided with a side feed port (121) connected to the interior, and the side fiber feeding mechanism (2) is connected to the inside of the melting section of the main extruder (1) through the side feed port (121) of the combined barrel (12), and the side fiber feeding mechanism (2) is used to transport chopped fibers into the melting section of the main extruder (1); the several groups of side fiber feeding mechanisms (2) are used for setting a number matching the number of chopped fibers for a plastic production process containing multiple chopped fibers and feeding each type of chopped fibers separately; The side fiber feeding mechanism (2) comprises a mixing hopper (21), an auxiliary material pipe (22), a quantitative component (23), a first feeding module (24) and a second feeding module (25), wherein the first feeding module (24) is connected to the mixing hopper (21) and the auxiliary material pipe (22), and the second feeding module (25) is connected to the auxiliary material pipe (22) and the main extruder (1), wherein the first feeding module (24) realizes conveying by driving a spiral fan blade by a motor, and the second feeding module (25) realizes conveying by driving a twin screw by a motor; The mixing hopper (21) is provided with a stirring assembly (26) for stirring the chopped fibers and a hot air blower (27) for drying. The quantitative assembly (23) is provided on one side of the mixing hopper (21). The quantitative assembly (23) includes a storage tank (231) for storing an additive and a metering pump (232) for quantitatively delivering the additive. The storage tank (231) is communicated with the interior of the mixing hopper (21) via the metering pump (232). The auxiliary material pipe (22) is in the shape of an inverted trapezoid, which is wide at the top and narrow at the bottom. The discharge port of the first feeding module (24) is connected to the top of the auxiliary material pipe (22). The bottom of the auxiliary material pipe (22) extends vertically downward and is connected to the second feeding module (25). The top of the auxiliary material pipe (22) is also provided with an observation port (221) and a cover (222) for covering the observation port (221). A combined screw module (13) is provided inside the main extruder (1), and the screw module (13) includes a shaft and a plurality of sets of threaded elements (131) and shearing elements (132) sleeved on the circumference of the shaft, wherein the shearing element (132) is sleeved on a section of the circumference of the shaft located inside the combined barrel (12), and the threaded element (131) is sleeved on the circumference of the remaining portion of the shaft, and the threaded element (131) has different leads and thread directions corresponding to different portions of the main extruder (1); The shearing element (132) is composed of a plurality of kneading blocks (1321), and the staggered angle between adjacent kneading blocks (1321) is 45°-60°; An exhaust port (122) communicating with the interior is provided on the top side of the combined barrel (12), an air guide plate (123) is provided on one side of the exhaust port (122), the air guide plate (123) extends obliquely downward in the feeding direction of the main extruder (1), and a long fiber guide roller (124) is provided on the side of the exhaust port (122) away from the air guide plate (123).

2. A glass fiber reinforced environmentally friendly plastic production process, applicable to the glass fiber reinforced environmentally friendly plastic production equipment according to claim 1, characterized in that: The following steps are involved: S1, stirring and mixing the components in the plastic masterbatch, and then adding them to the main extruder (1); S2, treating the chopped fibers with water and then fully drying them, and then adding them to the mixing hopper (21) of the side fiber feeding mechanism (2); S3, feeding the chopped fibers into the melting section of the main extruder (1) through the side fiber feeding mechanism (2), fully melting and blending the plastic masterbatch and the chopped fibers through the main extruder (1) and extruding them, and then water cooling, drying and granulating them after extrusion to obtain a glass fiber reinforced environmentally friendly plastic; The temperature of the main extruder (1) is set to 200-260°C, the main engine speed is 380-400r / min, the feeding speed is 25-35r / min, and the motor speed frequency of the second feeding module (25) of the side fiber feeding mechanism (2) is 12-42Hz.

3. The process for producing glass fiber reinforced environmentally friendly plastic according to claim 2, characterized in that: The plastic masterbatch comprises the following raw materials in parts by weight: Plastic main material: 100-150 parts; Maleic anhydride grafted polyethylene: 3-8 parts; Impact modifier: 2.5-5 parts; Antioxidant: 0.2-0.3 parts; Wherein, the main plastic material is a mixture of one or more of ABS resin and AS resin; Calculated based on the total weight of the plastic main material, the chopped fibers include the following raw materials: First staple fiber: 22-24%; Second staple fiber: 6-8%; The monofilament diameter of the first staple fiber is 17-24 μm, the monofilament diameter of the second staple fiber is 13-15 μm, and the lengths of the first staple fiber and the second staple fiber are 20-25 mm.

4. The process for producing glass fiber reinforced environmentally friendly plastic according to claim 3, characterized in that: The side fiber feeding mechanisms (2) are provided in two groups, and the side fiber feeding mechanisms (2) of the first group are located on a side of the side fiber feeding mechanisms (2) of the second group that is away from the feeding section of the main extruder (1); Wherein, the first staple fiber is added to the mixing hopper (21) of the first group of the side fiber feeding mechanism (2), and the motor speed frequency of the second feeding module (25) in the first group of the side fiber feeding mechanism (2) is 38-42 Hz; the second staple fiber is added to the mixing hopper (21) of the second group of the side fiber feeding mechanism (2), and the motor speed frequency of the second feeding module (25) in the second group of the side fiber feeding mechanism (2) is 12-18 Hz.

5. A glass fiber reinforced environmentally friendly plastic, characterized in that: The glass fiber reinforced environmentally friendly plastic is prepared by the production process of claim 4.

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