Glass fiber reinforced environment-friendly plastic as well as production process and equipment thereof

Abstract

The invention discloses glass fiber reinforced environment-friendly plastic as well as a production process and equipment thereof, and relates to the technical field of glass fiber reinforced plastics. Production equipment for producing glass fiber reinforced environment-friendly plastic comprises a main extruder and a plurality of side fiber feeding mechanisms, a plurality of combined machine barrels are arranged on a melting section of the main extruder, and the side fiber feeding mechanisms correspond to and are communicated with the combined machine barrels. And the side fiber feeding mechanism is used for conveying chopped fibers into the melting section of the main extruder. The side fiber feeding mechanism is used for feeding the chopped fibers, the production equipment can fully adapt to the production process of adding the chopped fibers, and then the production process of the glass fiber reinforced plastic can be optimized. According to the optimized production process, chopped fibers are adopted to replace long fibers, cost reduction is facilitated, and when the production equipment is adopted for preparation in the optimized production process, the labor cost can be effectively reduced, and the production efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the field of glass fiber reinforced plastics, 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] Since the plastic masterbatch has a high hardness when it is not fully melted, the plastic masterbatch will generate a large friction and shear force in the feeding section as the screw rotates. If the reinforcing fiber is directly fed from the feed port of the screw extruder together with the plastic masterbatch, the huge friction and shear force generated by the plastic masterbatch will grind or even crush the reinforcing fiber, which will greatly reduce the reinforcing effect of the reinforcing fiber. Therefore, in the prior art, the staff will manually feed the long fiber of the reinforcing fiber at the exhaust port of the melting section, so that the reinforcing fiber can be directly mixed into the plastic melt and the wear of the reinforcing fiber can be minimized.

[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 are required to feed them continuously and slowly. Not only is the labor intensity high and the overall production efficiency low, but the stability and uniformity of manual feeding are not high, and uneven mixing can easily lead to unstable or even substandard quality of the finished products. The finished products are 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, they are prone to problems such as fluffiness and low heat conduction efficiency. 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 adopts the following technical solutions: 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. The several groups of combined barrels are arranged in sequence along the extension direction of the main extruder. The several groups of side fiber feeding mechanisms correspond to the several groups of 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 inside 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.

[0008] By adopting the above technical solution, a plurality of chopped fibers are fed by using several groups of side fiber feeding mechanisms, 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 plastic can be optimized according to the production equipment. The optimized production process can use chopped fibers instead of long fibers, which is beneficial to reduce the cost of raw materials. Secondly, when the plastic formula contains chopped fibers, the production equipment is used for production, which not only does not require the staff to pre-mix and feed the chopped fibers, but also reduces the work intensity of the staff and improves the production efficiency. Moreover, by accurately controlling the feeding speed of the side fiber feeding mechanism, it can also prevent the chopped fibers from being piled up or too fluffy in the main extruder, which is beneficial to achieve uniform transportation and sufficient mixing of the chopped fibers, and ensure the product quality of the obtained plastic products.

[0009] 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, the first feeding module is connected to the mixing hopper and the auxiliary material pipe, the second feeding module is connected to the auxiliary material pipe and the main extruder, wherein the first feeding module drives the spiral blades through a motor to achieve conveying, and the second feeding module drives the twin screws through a motor to achieve conveying; 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 additives and a metering pump for quantitatively conveying the additives. The storage tank is connected to the interior of the mixing hopper through the metering pump.

[0010] By adopting the above technical solution, the chopped fibers can be quantitatively transported from the mixing hopper to the auxiliary material pipe through the first feeding module, and then quantitatively transported from the auxiliary material pipe to the main extruder through the second feeding module. Not only does the entire feeding process not require the participation of staff, but it can also ensure the uniformity and stability of the chopped fibers during transportation. In addition, the side fiber feeding mechanism can also modify the chopped fibers that need surface modification directly in the mixing hopper through the mutual cooperation between the quantitative component, the stirring component and the hot air blower, without the need for the staff to transfer the chopped fibers before and after modification multiple times, which is conducive to reducing the labor intensity of the staff and saving labor costs.

[0011] Optionally, the auxiliary material pipe is in the shape of an inverted terrace that is wide at the top and narrow 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 body is provided for covering the observation port.

[0012] By adopting the above technical solution, the auxiliary material pipe can play a certain role in caching and redistributing the chopped fibers, which is conducive to improving the uniformity and stability of the chopped fibers during feeding. In addition, the staff can monitor the accumulation of the chopped fibers in the second feeding module from the observation port, and adjust the motor speed frequency of the first feeding module and the second feeding module in time, which is conducive to ensuring that the chopped fibers can be transported in a uniform amount, and the cover body is conducive to preventing large sand and gravel debris from falling into the auxiliary material pipe, preventing blockage or damage to the second feeding module.

[0013] 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.

[0014] By adopting the above technical solution, the combined screw module can flexibly select and combine various thread elements and shear elements according to different processing requirements, which is conducive to adapting the production equipment to the characteristics of different raw materials and different production processes. By reasonably setting the thread elements and shear elements, the plastic masterbatch and short-cut fibers can be fully mixed in the main extruder, thereby not only using lower-cost short-cut fibers instead of long fibers, but also preventing the short-cut fibers from being further sheared and crushed during the mixing process, which is conducive to ensuring the product quality of the plastic finished product.

[0015] Optionally, the shearing element is composed of a plurality of kneading blocks, and the staggered angle between adjacent kneading blocks is 45°-60°.

[0016] By adopting the above technical solution, when the staggered angle of the kneading block 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, which is beneficial to ensuring the reinforcement effect of the chopped fibers.

[0017] Optionally, an exhaust port connected to the interior is opened on the top side of the combined barrel, and an air guide plate is arranged 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 arranged on the side of the exhaust port away from the air guide plate.

[0018] By adopting the above technical solution, an exhaust port and an air guide plate extending downwardly and obliquely toward the feeding direction are provided, which can not only guide the gas mixed with the material in the main extruder to be discharged, but also the inclined air guide plate can prevent the material from overflowing from the exhaust port during the conveying or mixing process. In addition, by providing a long fiber guide roller, the production equipment can prepare plastic according to the traditional production process of adding long fibers, which is not only conducive to improving the versatility of the production equipment, but also does not require additional staff to guide the long fibers into the main extruder, which is conducive to reducing the labor intensity of the staff and reducing labor costs.

[0019] In the second aspect, the present application provides a glass fiber reinforced environmentally friendly plastic production process using the following technical solutions: A glass fiber reinforced environmentally friendly plastic production process, suitable for the above production equipment for preparation, comprises the following steps: S1, stirring and mixing the components in the plastic masterbatch, and then adding them into the main extruder; S2, treating the chopped fibers with water and then fully drying them, and then adding them to the mixing hopper of the side fiber feeding mechanism; 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 them, and after extrusion, water cooling, drying and granulation are performed to obtain a glass fiber reinforced environmentally friendly plastic; The temperature of the main extruder is set to 200-260° C., the main machine 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.

[0020] Optionally, the plastic masterbatch includes 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 main plastic 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.

[0021] By adopting the above technical solution, short-cut fibers are used instead of traditional long fibers, which can not only greatly reduce the cost of raw materials, but also the short-cut fibers can use recycled regenerated short fibers, rationally utilize waste resources, and have certain green and environmental protection properties.

[0022] 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; Among them, the first short fibers are added to the mixing hopper of the first group of the side fiber feeding mechanisms, and the motor speed frequency of the second feeding module in the first group of the side fiber feeding mechanisms is 38-42Hz; the second short fibers are added to the mixing hopper of the second group of the side fiber feeding mechanisms, and the speed frequency of the first feeding module and the second feeding module in the second group of the side fiber feeding mechanisms is 12-18Hz.

[0023] By adopting the above technical scheme, the motor speed frequency of the second feeding module of the two sets of side fiber feeding mechanisms is controlled respectively, so the feeding speed of the two different chopped fibers can be effectively adjusted. 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 number of types of chopped fibers to feed them separately, without the need for staff to pre-mix the materials, which is conducive to reducing labor costs.

[0024] In the third aspect, the present application provides a glass fiber reinforced environmentally friendly plastic adopting the following technical solution: A glass fiber reinforced environmentally friendly plastic is prepared by the above-mentioned production equipment and production process.

[0025] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. By using the side fiber feeding mechanism to feed the chopped fibers, the workers do not need to pre-mix and feed the chopped fibers, which is beneficial to reduce the work intensity of the workers and improve production efficiency.

[0026] 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.

[0027] 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.

[0028] 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 product quality of the plastic finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application.

[0030] Figure 2 It 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.

[0031] Figure 3 It 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.

[0032] Figure 4 This is a partial structural diagram of a 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.

[0033] Figure 5 It is a schematic diagram of the structure of a combined barrel of a glass fiber reinforced environmentally friendly plastic production equipment in Example 1 of the present application.

[0034] Figure 6 It 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.

[0035] Description of reference numerals: 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. Shear element; 1321. Kneading block; 2. Side fiber feeding mechanism; 21. Mixing hopper; 22. Auxiliary material pipe; 221. Observation port; 222. Cover; 23. Dosing component; 231. Storage tank; 232. Metering pump; 24. First feeding module; 25. Second feeding module; 26. Stirring component; 261. Stirring rod; 262. Stirring motor; 27. Hot air blower. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 , Examples and Comparative Examples further illustrate the present application in detail. Example

[0037] [Example 1] The present application discloses a glass fiber reinforced environmentally friendly plastic production equipment. Figure 1 and Figure 2 A 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 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 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 inside is provided on one side of the combined barrel 12. 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, 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.

[0038] Reference Figure 2 and Figure 3The 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 uniformly 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 transport of the chopped fibers by driving the spiral blades through a 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.

[0039] 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. The quantitative assembly 23 is arranged on one side of the mixing hopper 21, and the quantitative assembly 23 includes a storage tank 231 for storing an additive and a metering pump 232 for quantitatively conveying the additive, and the storage tank 231 and the metering pump 232 are connected to the inside 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, and the surface of the chopped fibers can be simply mixed and modified by cooperating with the stirring assembly 26 and the hot air blower 27.

[0040] Reference Figure 2 and Figure 3 The auxiliary material pipe 22 is in an inverted terraced structure with a width at the top and a narrowness 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. Since the second feeding module 25 needs to adjust the motor speed frequency at any time according to the processing situation to change the feeding speed, the auxiliary material pipe 22 can play a certain role in caching the chopped fibers, which is conducive to making the transportation of the chopped fibers more uniform and stable. In addition, an observation port 221 is provided at the top of the auxiliary material pipe 22, and a cover body 222 is provided for covering the observation port 221, so that the staff can monitor the accumulation of the chopped fibers from the observation port 221, and timely adjust the motor speed frequency of the first feeding module 24 and the second feeding module 25 to ensure the stable transportation of the chopped fibers, and the cover body 222 is conducive to preventing large sand and gravel debris from falling into the auxiliary material pipe 22, preventing blockage or damage to the second feeding module 25.

[0041] Reference Figure 4 In the present 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 part of the circumference of the shaft located inside the closed barrel 11, and the shearing element 132 is mainly sleeved on the part of the circumference of the shaft located inside the combined barrel 12.

[0042] 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 large lead, positive right-hand threaded element 131; the part of the shaft corresponding to the melting section of the main extruder 1 is provided with a medium lead, positive right-hand threaded element 131 and a small amount of medium lead, reverse left-hand threaded elements 131; the part of the shaft corresponding to the melting section of the main extruder 1 is provided with a small lead, positive right-hand threaded element 131.

[0043] Reference Figure 4 The shearing element 132 is specifically composed of a plurality of kneading blocks 1321 arranged and combined in sequence. In this embodiment, the staggered angle between adjacent kneading blocks 1321 is 45°, while 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 the chopped fibers in the melting section, which is beneficial to 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, which is beneficial to ensure the reinforcement effect of the chopped fibers. In addition, the medium-lead, reverse left-handed threaded element 131 is located at the feeding 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 the chopped fibers.

[0044] Reference Figure 5 and Figure 6 The top side of the combined barrel 12 is also provided with an exhaust port 122 connected to the inside. A wind deflector 123 is provided on the side of the exhaust port 122 close to the feeding section of the main extruder 1. The wind deflector 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 wind deflector 123. The long fiber guide roller 124 is used to guide the long fibers from the exhaust port 122 into the main extruder 1, thereby not only enabling the production equipment to prepare plastic according to the traditional production process of adding long fibers, but also eliminating the need for additional staff to guide the long fibers into the main extruder 1, which is conducive to improving the versatility of the production equipment and reducing the labor intensity of the staff.

[0045] A glass fiber reinforced environmentally friendly plastic production process is applicable to a glass fiber reinforced environmentally friendly plastic production device disclosed in this embodiment for production, and specifically includes the following steps: S1, stirring and mixing the components in the plastic masterbatch, and then adding them into the main extruder 1; 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; 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. Then, the mixture is water-cooled, dried and granulated to obtain a glass fiber reinforced environmentally friendly plastic.

[0046] In this embodiment, the plastic masterbatch includes the following raw materials: 150kg plastic main material, 8kg maleic anhydride grafted polyethylene, 5kg impact modifier, 0.3kg antioxidant.

[0047] The main plastic material includes 125kg ABS resin and 25kg AS resin, the specific grade of maleic anhydride grafted polyethylene is SMA-700, the impact modifier is MBS resin, and the antioxidant includes 0.15kg antioxidant 1010 and 0.15kg antioxidant 168.

[0048] In this embodiment, the amount of short fibers added is 30% of the weight of the main plastic material, including 33 kg of first short fibers and 12 kg of second short fibers. Specifically, the first short fibers are short fibers 388 with a single fiber diameter of 17-24 μm, and the second short fibers are short fibers 588B with a single fiber diameter of 13-15 μm. The lengths of the first short fibers and the second short fibers are 25 mm.

[0049] Further, in the present 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 feeding 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 38-40Hz, 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 15-18Hz.

[0050] Furthermore, in this embodiment, the specific parameters of the main extruder 1 are as follows:

[0051] A glass fiber reinforced environmentally friendly plastic is prepared by a glass fiber reinforced environmentally friendly plastic production device and a production process disclosed in this embodiment.

[0052] [Example 2] 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.

[0053] In this embodiment, the plastic masterbatch includes the following raw materials: 100kg plastic main material, 2kg maleic anhydride grafted polyethylene, 2.5kg impact modifier, 0.2kg antioxidant.

[0054] The main plastic material is AS resin, the specific grade 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.

[0055] In this embodiment, the amount of short fibers added is 30% of the weight of the main plastic material, including 24 kg of first short fibers and 6 kg of second short fibers. Specifically, the first short fibers are short fibers 388 with a single fiber diameter of 17-24 μm, and the second short fibers are short fibers 588B with a single fiber diameter of 13-15 μm. The lengths of the first short fibers and the second short fibers are 20 mm.

[0056] Furthermore, in this embodiment, the first short fiber is added to the mixing hopper 21 of the first group of side fiber feeding mechanism 2, and the motor speed frequency of the second feeding module 25 in the first group of side fiber feeding mechanism 2 is set to 40-42Hz, and the second short fiber is added to the mixing hopper 21 of the second group of side fiber feeding mechanism 2, and the motor speed frequency of the second feeding module 25 in the second group of side fiber feeding mechanism 2 is set to 12-15Hz.

[0057] Furthermore, in this embodiment, the specific parameters of the main extruder 1 are as follows:

[0058] A glass fiber reinforced environmentally friendly plastic is prepared by a glass fiber reinforced environmentally friendly plastic production device and a production process disclosed in this embodiment.

[0059] [Example 3] A glass fiber reinforced environmentally friendly plastic production process is suitable for production by 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.

[0060] In this embodiment, the short fibers are the same as those in Embodiment 2, but only one side feeding mechanism is provided. Specifically, the first short fibers and the second short fibers are mixed in proportion in advance and then added to the mixing hopper 21 of the side fiber feeding mechanism 2, and the feeding speed of the second feeding module 25 is the same as that in Embodiment 2.

[0061] [Example 4] 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] for production, and the difference from [Example 2] lies in the difference in the second fiber in the chopped fibers.

[0062] 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.

[0063] Furthermore, the second fiber needs to be treated with a surface modification agent before being transported 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 quantitative component 23 in the second group of side feeding mechanisms, and quantitatively added to the mixing hopper 21 through the metering pump 232. With the sufficient stirring and drying of the stirring component 26 and the hot air blower 27, the second short fiber with surface treatment can be obtained in the mixing hopper 21.

[0064] A glass fiber reinforced environmentally friendly plastic is prepared by a glass fiber reinforced environmentally friendly plastic production device and a production process disclosed in this embodiment. Comparative Example

[0065] [Comparative Example 1] A glass fiber reinforced plastic production process is applicable to the production of a glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1]. The difference from [Example 1] is that short-cut fibers are not added.

[0066] In this comparative example, long fibers are used instead of short fibers. Specifically, the long fibers are selected to have a single filament 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.

[0067] [Comparative Example 2] A glass fiber reinforced plastic production process is applicable to the production of a glass fiber reinforced environmentally friendly plastic production equipment disclosed in [Example 1], and the difference from [Example 2] is that short chopped fibers are not added.

[0068] In this comparative example, long fibers are used instead of short fibers. Specifically, the long fibers are selected to have a single filament 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. Performance test data

[0069] 1. Tensile strength: The tensile strength test was performed 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 to 50 mm / min, and the tensile strength (MPa) of the samples to be tested prepared in each embodiment and comparative example was recorded.

[0070] 2. Bending strength: The bending strength test was carried out with reference to GB / T 9341-2008 Determination of flexural properties of plastics, wherein the bending span was 64 mm, the pressing speed was 2 mm / min, and the bending strength (MPa) of the samples to be tested prepared in each embodiment and comparative example was recorded.

[0071] 3. Impact strength: Refer to GB / T 1843-2008 Determination of cantilever beam impact strength of plastics for testing, using a 2.75J pendulum, and record the notched impact strength (KJ / m 2 ).

[0072] Table 1 Mechanical properties test data of plastic parts

[0073] Combining the data of Example 1-2 with Comparative Example 1-2 and 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 performance of the obtained plastic is equivalent to that of the plastic obtained by the traditional process of using long fiber reinforced plastic, and even some mechanical properties of the finished product are further improved. That is to say, it is explained 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 work intensity of the staff, but also the control of the feeding speed of the side fiber feeding mechanism 2 and the reasonable setting of the thread combination of the main extruder 1 can effectively prevent the chopped fibers from being piled up or too fluffy in the main extruder 1, which is conducive to achieving uniform transportation and full mixing of the chopped fibers and ensuring the product quality of the obtained plastic product.

[0074] Combining Examples 2-3 and the data in Table 1, it can be seen that by using 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, the pre-mixed chopped fibers may contain more first staple fibers or more second staple fibers. Feeding separately through two sets of side fiber feeding mechanisms 2 can ensure that the two chopped fibers can be added to the main extruder 1 in proportion, and can also prevent the above-mentioned uneven distribution. It is not only conducive to ensuring the product quality of the obtained plastic finished product, but also convenient for adjusting the overall performance of the plastic finished product. In addition, there is no need for staff to pre-mix, which reduces labor costs.

[0075] 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.

[0076] 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 such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A glass fiber reinforced environmentally friendly plastic production equipment, characterized by: The invention comprises a main extruder (1) and a plurality of groups of side fiber feeding mechanisms (2); the melting section of the main extruder (1) is provided with a plurality of groups of combined barrels (12); the plurality of groups of combined barrels (12) are arranged in sequence along the extension direction of the main extruder (1); the plurality of groups of side fiber feeding mechanisms (2) correspond to the plurality of groups of combined barrels (12); a side feed port (121) connected to the interior of the combined barrel (12) is provided on one side of the combined barrel (12); the side fiber feeding mechanism (2) is connected to the interior 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).

2. The glass fiber reinforced environmentally friendly plastic production equipment according to claim 1, characterized in that: The side fiber feeding mechanism (2) comprises a mixing hopper (21), an auxiliary material pipe (22), a dosing assembly (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 component (26) for stirring the chopped fibers and a hot air blower (27) for drying. The quantitative component (23) is arranged on one side of the mixing hopper (21). The quantitative component (23) comprises a storage tank (231) for storing an auxiliary agent and a metering pump (232) for quantitatively conveying the auxiliary agent. The storage tank (231) is connected to the interior of the mixing hopper (21) via the metering pump (232).

3. The glass fiber reinforced environmentally friendly plastic production equipment according to claim 2, characterized in that: The auxiliary material pipe (22) is in the shape of an inverted terrace that is wider at the top and narrower 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); an observation port (221) is also provided at the top of the auxiliary material pipe (22), and a cover body (222) is provided for covering the observation port (221).

4. The glass fiber reinforced environmentally friendly plastic production equipment according to claim 2, characterized in that: A combined screw module (13) is arranged inside the main extruder (1), and the screw module (13) includes a shaft and a plurality of groups 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).

5. The glass fiber reinforced environmentally friendly plastic production equipment according to claim 4, characterized in that: 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°.

6. The glass fiber reinforced environmentally friendly plastic production equipment according to claim 2, characterized in that: 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).

7. A glass fiber reinforced environmentally friendly plastic production process, applicable to a glass fiber reinforced environmentally friendly plastic production equipment as claimed in any one of claims 2 to 6, 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 after extrusion, water cooling, drying and granulation are performed to obtain a glass fiber reinforced environmentally friendly plastic; The temperature of the main extruder (1) is set to 200-260° C., the main machine speed is 380-400 r / min, the feeding speed is 25-35 r / min, and the motor speed frequency of the second feeding module (25) of the side fiber feeding mechanism (2) is 12-42 Hz.

8. The process for producing glass fiber reinforced environmentally friendly plastic according to claim 7, 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 main plastic 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.

9. A glass fiber reinforced environmentally friendly plastic production process according to claim 8, 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, when the first staple fiber is added to the mixing hopper (21) of the first group of the side fiber feeding mechanisms (2), the motor speed frequency of the second feeding module (25) in the first group of the side fiber feeding mechanisms (2) is 38-42 Hz; when the second staple fiber is added to the mixing hopper (21) of the second group of the side fiber feeding mechanisms (2), the motor speed frequency of the first feeding module (24) and the second feeding module (25) in the second group of the side fiber feeding mechanisms (2) is 12-18 Hz.

10. 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 9.

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