Low-temperature preparation method and preparation device of plastic additive master batch

Abstract

The invention belongs to the technical field of plastics, and particularly relates to a low-temperature preparation method and a preparation device of a plastic additive master batch, and the plastic additive master batch is prepared from the following raw materials in percentage by mass: 0-80% of plastic powder and 20-100% of a plastic additive; the preparation method comprises the following steps: feeding the plastic additive in a main feeding manner and the plastic powder in a side feeding manner by adopting a screw with a deep groove thread and a double-screw extruder with a specific length-diameter ratio, and sequentially performing cyclone cooling, granulation and screening on a material extruded by the double-screw extruder to obtain the high-strength plastic material. The finally obtained plastic additive master batch has the characteristics of uniform particle size, low powder rate, high compressive strength and the like. The preparation method has the characteristics of low energy consumption in the preparation process, simple process, convenience in operation, high universality and the like. The preparation device comprises a spraying device, a screw with a deep groove thread, a double-screw extruder with a specific length-diameter ratio, specific cyclone cooling equipment, a granulator and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of plastics, and particularly relates to the technical field of plastic additive masterbatches. Background Art

[0002] Plastic additive masterbatches are widely used, including antioxidant masterbatches, light stabilizer masterbatches, lubricant masterbatches, anti-aging agent masterbatches, nucleating agent masterbatches, antistatic agent masterbatches, flame retardant masterbatches, and composite masterbatches of the above-mentioned additives.

[0003] When using a conventional extruder to make masterbatches, it is necessary to melt all the polymer materials and additives. When preparing high-concentration additive masterbatches (additive concentration greater than 15%) with a conventional extruder, especially when the polymer material has a high viscosity, since the viscosity of the additive is low after melting, it is very easy to have uneven mixing of the additive and the polymer material in the screw or some low-viscosity additives cannot be mixed into the polymer material, resulting in the extruded material not taking shape, some low-viscosity additives flowing out from the die of the extruder, or the extrudate being uneven, thus causing various problems.

[0004] Cold granulation can produce plastic additive masterbatches with a concentration of 20-100%, but the formula applicability is narrow, and the powder rate is close to 5%. The compressive strength of the masterbatch is generally lower than 60 N (test standard: GB / T 44750—2024). At the same time, the granulation principle of cold granulation is a cold pressing process, and the material is compacted by a metal roller or grinding disc under a pressure of 10-30 MPa. The metal roller or grinding disc will have a large amount of wear when working under such a high pressure for a long time. After a long time, it can be clearly seen that the roller or grinding disc is worn. In addition, the metal powder after the roller or grinding disc is worn will also be doped into the masterbatch, resulting in the metal content in the masterbatch exceeding the standard or black spots appearing in the product, and at the same time, it will also affect the subsequent application of the plastic additive masterbatch.

[0005] In summary, there is an urgent need for a low-temperature preparation method of plastic additive masterbatches with a high concentration of plastic additives, and at the same time, the final obtained plastic additive masterbatches have uniform particle size, low powder rate, and high compressive strength. Summary of the Invention

[0006] The purpose of this application is to provide a low-temperature preparation method and a preparation device for plastic additive masterbatches with a high concentration of plastic additives, and at the same time, the final obtained plastic additive masterbatches have uniform particle size, low powder rate, and high compressive strength.

[0007] Technical Solution of this Application In the first aspect, this application provides a low-temperature preparation method for plastic additive masterbatches, which adopts the following technical solution: A low-temperature preparation method for plastic additive masterbatches, the raw materials used in the preparation are calculated by mass percentage, and the raw material composition and content are as follows: Plastic powder 0-80% Plastic additives: 20 - 100%; The plastic powder is polyamide 66 powder, polycarbonate powder, acrylonitrile - butadiene - styrene copolymer powder or polypropylene powder.

[0008] The following is the low - temperature preparation method of the above - mentioned plastic additive masterbatch: Using a twin - screw extruder, feed the plastic additives in the main feeding mode and the plastic powder in the side feeding mode, and adjust the working temperature of the twin - screw extruder so that at least 15% of the plastic additives in the screw are melted and mixed evenly with the remaining unmelted materials (the unmelted materials include plastic powder and unmelted plastic additives) (to ensure that the materials in the screw reach a state of uniform plasticization). The materials extruded from the twin - screw extruder are then successively subjected to cyclone cooling, pelletizing, and screening to finally obtain the plastic additive masterbatch; The screw threads on the screw of the twin - screw extruder are deep - groove threads. The twin - screw extruder with a screw having deep - groove threads has the advantages of more material intake, better plasticization of materials, and in combination with a high - torque motor, it is easier to extrude the plasticized materials.

[0009] By adopting the above - mentioned technical solution, for the low - temperature preparation method of a plastic additive masterbatch, since the twin - screw extruder uses a screw with deep - groove threads and is equipped with a special feeding method, the plastic powder used for preparing the plastic additive masterbatch does not need to be melted, thereby reducing the energy consumption in the production process. At the same time, the range of plastic additives and plastic powders applicable to this preparation method is wide, and the preparation method has strong versatility. The concentration of the plastic additives used in the preparation is high, so relatively, the transportation cost of the plastic additives is reduced, and the use cost of the customers is further reduced; Furthermore, the plastic additive masterbatch obtained by this preparation method has uniform particle size, low powder rate (the powder rate is detected to be < 1 wt%), high compressive strength, and strong shear resistance.

[0010] In the above - mentioned low - temperature preparation method of a plastic additive masterbatch, the raw materials used for preparing the plastic additives are solid - powder - shaped plastic additives, or a composite of solid - powder - shaped plastic additives and liquid plastic additives with a mass ratio of solid - powder - shaped plastic additives: liquid plastic additives of 1:0.1 - 0.3; The solid - powder - shaped plastic additives include one or a composite of two or more of powdered antioxidants, light stabilizers, lubricants, nucleating agents, etc.; Among them, the powdery antioxidants can be hindered phenol antioxidants such as 1010, 1076, 1098, 245, 565, etc. (in this application, only Irganox 1098 is used as an example, but it does not limit the application of other hindered phenol antioxidants), or can be phosphite antioxidants such as 168, PEPQ, 9228, etc. (in this application, only Doverphos S-9228 is used as an example, without limiting the application of other phosphite antioxidants), or can be one or a combination of two or more thioester antioxidants such as DLTDP, DSTDP, 412S, etc.; The powdery light stabilizers can be light stabilizers with a piperidineamine structure such as 770, 944, 119, 622, 4050H, SEED, 3346, 2020, etc., can be benzophenone ultraviolet absorbers such as UV531, benzotriazole ultraviolet absorbers such as UV326, UV327, UV360, UV328, UV329, UV-P, UV928, UV234, etc., benzoate ultraviolet absorbers such as UV2908, benzotriazine ultraviolet absorbers such as UV1164, UV1577, UV405, etc., formamidine types such as UV-3, oxanilide types such as UV312, benzoxazine ultraviolet absorbers such as UV3638, etc.; The powdery lubricants can be long-chain amide waxes such as oleic acid amide, erucic acid amide, ethylene bisstearamide, etc., long-chain fatty acids such as stearic acid, metal stearates such as calcium stearate, zinc stearate, magnesium stearate, etc., long-chain fatty alcohols such as stearyl alcohol, cetyl alcohol, behenyl alcohol, etc.; The powdery nucleating agents are inorganic nucleating agents such as silica, calcium carbonate, talc powder, rare earth oxides, etc., carboxylate organic nucleating agents such as sodium benzoate, sodium succinate, calcium octanedioate, rare earth metal salts, Clariant Licomont TM NaV 101, Clariant Licomont TM CaV102 and other carboxylate organic nucleating agents, sorbitol derivative organic nucleating agents such as Millad 3988; The liquid plastic additives described above include one or a combination of two or more of liquid antioxidants, liquid light stabilizers, liquid flame retardants, liquid plasticizers, etc.; The liquid antioxidants can be hindered phenol antioxidants such as 1135, 1315, 1520, etc., or can be aliphatic phosphite antioxidants such as TDP, TLP, TTDP, P430, etc. or aromatic phosphites or alkylphenyl mixed type phosphite antioxidants such as DPDP, PDP, 705, 4500, TNPP, etc., or can be thioesters such as DTDTP; The liquid light stabilizer can be a liquid light stabilizer containing piperidineamine such as 292, and ultraviolet absorbers such as UV384, UV400, UV1130, etc. (in this application, only BASF TINUVIN 400 is taken as an example, and the application of other liquid light stabilizers is not limited); The liquid flame retardant can be phosphate flame retardants such as hydroquinone bis(diphenyl phosphate), tris(butoxyethyl) phosphate, etc.; the liquid plasticizer can be white oil (in this application, only the white oil KN4010 of Karamay naphthenic base is taken as an example, and the application of other white oils is not limited), naphthenic oil, epoxy soybean oil, phthalate ester, citrate ester plasticizer.

[0011] In this application, only a solid powder plastic auxiliary composed of a powdered hindered phenol antioxidant 1098 and a phosphite 9228 in a mass ratio of 1:1, and a liquid plastic auxiliary composed of liquid plasticizer white oil and liquid light stabilizer UV400 in a mass ratio of 1:1 are taken as examples for illustration, but the application of the above-mentioned other solid powder plastic auxiliaries and liquid plastic auxiliaries in the low-temperature preparation method of the plastic auxiliary masterbatch in this application is not limited.

[0012] In this application, the plastic powder is also only illustrated by taking polyamide 66 powder, polycarbonate powder (hereinafter referred to as PC powder), acrylonitrile-butadiene-styrene copolymer powder or polypropylene powder (hereinafter referred to as PP powder) as examples, but the use of other plastic powders in the low-temperature preparation method of the plastic auxiliary masterbatch in this application is not limited.

[0013] Preferably, in the above-mentioned low-temperature preparation method of a plastic auxiliary masterbatch, the feeding rate of the side feeder is 0 - 380 kg / h, and the feeding rate of the main feeder is 20 - 400 kg / h; The working temperature of the twin-screw extruder is 40 - 180 °C.

[0014] The plastic powder is polyamide 66 powder, polycarbonate powder, acrylonitrile-butadiene-styrene copolymer powder or polypropylene powder.

[0015] By adopting the above technical solution, the finally obtained plastic auxiliary masterbatch particles have uniform particle size, low powder rate and high compressive strength.

[0016] Preferably, in the above-mentioned low-temperature preparation method of the plastic auxiliary masterbatch: When the raw materials used for preparing the plastic auxiliary are solid powder plastic auxiliaries, the plastic auxiliary preparation steps are as follows: Mix the solid powder plastic auxiliaries evenly to obtain the plastic auxiliary; When the raw materials used for preparing the plastic auxiliary are a combination of solid powder plastic auxiliaries and liquid plastic auxiliaries, the plastic auxiliary preparation steps are as follows: First, mix the solid powdered plastic additives evenly, preferably controlling the rotation speed at 15 - 600 r / min to obtain a mixed powder; Then, mix the liquid plastic additives evenly. After heating the obtained liquid mixture to a viscosity of 90 - 110 cps (or select 40 - 60 °C), control the pressure at 0.1 - 0.2 Mpa and the spraying rate at 2 - 7 L / min / m under stirring conditions 2 and spray it onto the above - obtained mixed powder. After spraying, continue to stir and mix for 5 - 20 min to obtain plastic additives.

[0017] The nozzle of the above - mentioned spraying device uses an atomizing nozzle or a rotating nozzle (these types of nozzles can provide good liquid distribution and atomization effects. In the embodiments of this application, only the atomizing nozzle is used as an example). The porosity is 30 - 50% (ensuring that the liquid can be evenly distributed during spraying and avoiding excessive gas retention from affecting the mixing effect. In the embodiments of this application, only a porosity of 40% is used as an example), and the spraying aperture is 0.3 - 0.6 mm (which can effectively atomize the liquid, ensure good spraying effects, and at the same time will not cause poor liquid flow. In the embodiments of this application, only a spraying aperture of 0.4 mm is used as an example); When there is no plastic powder in the plastic additives (the usage amount of plastic powder is 0), that is, when preparing the plastic additive masterbatch with only plastic additives, close the side feeding (the feeding rate of plastic powder is 0 kg / h), and the feeding rate of plastic additives is 100 - 400 kg / h; Preferably, in the above - mentioned low - temperature preparation method of the plastic additive masterbatch: The twin - screw extruder is a parallel co - rotating twin - screw extruder or a parallel counter - rotating twin - screw extruder. The parallel counter - rotating twin - screw extruder is a parallel counter - rotating outward twin - screw extruder or a parallel counter - rotating inward twin - screw extruder. Considering characteristics such as large thrust, good mixing effect, and large feeding capacity, it is preferably a parallel counter - rotating outward twin - screw extruder, and its length - to - diameter ratio is 4:1 - 48:1; By adopting the above - mentioned technical solution, since the compressive strength of the materials extruded by different twin - screw extruders and different length - to - diameter ratios is different, using the parallel counter - rotating outward twin - screw extruder with the above - mentioned specific length - to - diameter ratio, the finally obtained plastic additive masterbatch has uniform particle size, low powder rate, the powder rate is 0.3 - 0.8 wt%, the density of the particles is large, and the compressive strength is 60 - 180 N.

[0018] Furthermore, for the preferably parallel counter - rotating outward twin - screw extruder, the length - to - diameter ratio is 4:1 - 20:1.

[0019] By adopting the above - mentioned technical solution, the powder rate of the obtained plastic additive masterbatch is 0.3 - 0.7 wt% and the compressive strength is 80 - 180 N. Therefore, the plastic additive masterbatch has high shear and compressive strength.

[0020] Furthermore, the preferred parallel co-rotating twin-screw extruder has a length-to-diameter ratio of 12:1.

[0021] By adopting the above technical solution, the powder rate of the obtained plastic auxiliary masterbatch is at least 0.3 wt%, and the compressive strength can reach up to 180 N. Therefore, the plastic auxiliary masterbatch has higher shear and compressive strength.

[0022] For the cyclone cooling mentioned above, a closed spiral air-cooled steel belt is used for cooling, and the cold air temperature is controlled at 10 - 15 °C during the cooling process: The closed spiral air-cooled steel belt is driven by a motor. The length of the steel belt is preferably 20 - 60 m, more preferably 40 - 60 m. The steel belt needs to be made of a material that is not easy to rust and is resistant to acid and alkali corrosion. The closed spiral air-cooled steel belt is overall airtight, with 1 - 2 cold air inlets and 1 - 2 hot air outlets, and the positions of the cold air inlets and hot air outlets are opposite to make the path of the cold air as long as possible. The hot air outlet needs to be connected to the factory waste gas system; For the granulation mentioned above, a granulator is used for granulation; the granulator can be a pair-roll crusher with oblique lines on the rolls, a swing granulator with a drum that can rotate forward and backward, an impact blade crusher or a shredder with moving and fixed blades, etc.; however, since the rotational speeds of the crusher and shredder are often relatively high, it will lead to a wider product size distribution and a higher powder rate in the product. Therefore, it is preferred to use a pair-roll crusher with oblique lines on the rolls and a swing granulator with a drum that can rotate forward and backward, and the size of the plastic auxiliary masterbatch product obtained by granulation is more regular; For the screening mentioned above, a screening machine is used for classification screening. The screening machine for classification screening is a straight vibrating screening machine with replaceable different aperture sieves, and the aperture of the sieve for straight vibrating screen classification can be selected according to the size of the plastic auxiliary masterbatch to be prepared.

[0023] Preferably, in the above low-temperature preparation method of the plastic auxiliary masterbatch: during the screening process, if the particle size of the plastic auxiliary masterbatch product particles is smaller than the specified rubber auxiliary masterbatch, it is required to be sent back and mixed with the plastic auxiliary raw materials used in the preparation of the next batch of plastic auxiliary masterbatch, and then successively through cyclone cooling, granulation, and screening; if the particle size of the plastic auxiliary masterbatch product particles is too large and exceeds the specified size range of the rubber auxiliary masterbatch, it is directly sent back to the granulation process for re-granulation.

[0024] By adopting the above technical solution, in a low-temperature preparation method of a plastic auxiliary masterbatch, the recycling during the preparation process can improve the raw material utilization rate of the preparation of the plastic auxiliary masterbatch, thereby reducing the preparation cost of the plastic auxiliary masterbatch.

[0025] Second aspect, the present application provides a preparation device for the above-mentioned plastic auxiliary masterbatch, adopting the following technical solution. A preparation device for a plastic auxiliary masterbatch includes a mixer, a spraying device, a twin-screw extruder, an enclosed spiral air-cooled steel belt, a granulator and a screening machine; The nozzle of the spraying device adopts a spray nozzle or a rotary nozzle (these types of nozzles can provide good liquid distribution and atomization effect. In the embodiments of the present application, only the spray nozzle is taken as an example), the porosity is 30-50% (ensuring that the liquid can be evenly distributed during spraying, and at the same time avoiding excessive gas retention from affecting the mixing effect. In the embodiments of the present application, only the porosity of 40% is taken as an example), and the spray aperture is 0.3-0.6 mm (which can effectively atomize the liquid, ensure good spraying effect, and at the same time will not cause poor liquid flow. In the embodiments of the present application, only the spray aperture of 0.4 mm is taken as an example); The twin-screw extruder adopts a parallel co-rotating twin-screw extruder or a parallel counter-rotating twin-screw extruder; the parallel counter-rotating twin-screw extruder adopts a parallel counter-rotating outward twin-screw extruder or a parallel counter-rotating inward twin-screw extruder, preferably adopts a parallel counter-rotating outward twin-screw extruder, which has the characteristics of large thrust, good mixing effect, and large feeding capacity; The cyclone cooling adopts an enclosed spiral air-cooled steel belt, which is driven by a motor. The length of the steel belt is 20-60 m. The enclosed spiral air-cooled steel belt has 1-2 cold air inlets and 1-2 hot air outlets, and the positions of the cold air inlet and the hot air outlet are opposite; The granulator adopts a pair-roll crusher with oblique lines on the rolls, a swing granulator with a drum that can rotate forward and backward, an impact blade crusher or a shredder with a moving knife and a fixed knife; The screening machine adopts a straight vibrating screening machine with replaceable different-aperture sieves. In the present application, according to the particle size of the plastic auxiliary masterbatch product to be obtained, it can be 0.5-10 mm. A straight vibrating screening machine with two layers of sieves can be selected. The upper layer screens out large particles, the lower layer screens out powders, and the middle layer is the required finished product. Generally, the upper layer adopts a 5-10 mm round-hole sieve, and the lower layer adopts a 0.5-3 mm round-hole sieve.

[0026] Preferably, the length-diameter ratio of the adopted parallel counter-rotating outward twin-screw extruder is 4:1-48:1.

[0027] Further, the preferred length-diameter ratio is 4:1-20:1. Furthermore, preferably, the length-diameter ratio of the parallel counter-rotating outward twin-screw extruder is 12:1.

[0028] The enclosed spiral air-cooled steel belt described above: It is driven by a motor. The length of the steel belt is preferably 20 - 60 m, more preferably 40 - 60 m. The steel belt is made of a material that is not prone to rust and is resistant to acid and alkali corrosion. The enclosed spiral air-cooled steel belt is overall enclosed, with 1 - 2 cold air inlets and 1 - 2 hot air outlets, and the positions of the cold air inlets and hot air outlets are opposite to make the path of the cold air as long as possible, resulting in better cooling effect. Its hot air outlet needs to be connected to the factory waste gas system; The granulator described above: It uses a pair-roll crusher with oblique lines on the rolls, a swing granulator with a drum that can rotate forward and backward, an impact blade crusher or shredder with moving and fixed blades, etc.; However, since the rotational speeds of the crusher and shredder are often relatively high, it will lead to a relatively wide product size distribution and a relatively high powder rate in the product. It is preferably to use a pair-roll crusher with oblique lines on the rolls or a swing granulator with a drum that can rotate forward and backward. The plastic additive masterbatch products obtained by granulation have more regular sizes, that is, the yield of products meeting the size requirements will be relatively higher; The screening machine described above: A straight vibrating screen with replaceable sieve meshes of different apertures.

[0029] By adopting the above technical solutions, for a preparation device of plastic additive masterbatch, since it is composed of a specific spraying device, a screw with deep groove threads and a twin-screw extruder with a specific length-diameter ratio, a specific cyclone cooling device, a granulator, etc., the plastic additive masterbatch of the present application can be prepared by a hot granulation method. When used for the production of plastic additive masterbatch, the use concentration of plastic additives is high, the obtained rubber additive masterbatch has uniform particle sizes, a low powder rate, the powder rate is 0.3 - 0.8 wt%, and the compressive strength is high, up to 180 N at most.

[0030] The beneficial technical effects of the present application For the low-temperature preparation method of a plastic additive masterbatch of the present application, since the concentration of plastic additives in the rubber additive masterbatch is high, and its concentration can reach 20 - 100%, that is, up to 100% at most, the raw material cost and transportation cost of the plastic additive masterbatch are relatively reduced, thus relatively reducing the use cost of the customers using the plastic additive masterbatch.

[0031] Furthermore, for the low-temperature preparation method of a plastic additive masterbatch of the present application, since the preparation process uses a preparation device of plastic additive masterbatch composed of a specific spraying device, a twin-screw extruder with a specific length-diameter ratio, a specific cyclone cooling device, a granulating machine, etc., and adopts a hot granulation method, the plastic powder (plastic or rubber) in the additive masterbatch does not need to be melted, reducing the energy consumption in the production process. Therefore, the production energy consumption cost of the preparation is relatively reduced, and the preparation process is simple and convenient to operate. At the same time, the preparation method has a wide range of applicable plastic additives and plastic powders, so the preparation method also has the characteristic of strong versatility.

[0032] Furthermore, in a low-temperature preparation method of a plastic additive masterbatch according to the present application, the usage concentration of the plastic additive reaches 20-100%, and the resulting plastic additive masterbatch has a low powder rate (detected to be <1 wt%). Due to the low powder rate, the finished product yield of this preparation method is relatively high, the particles of the obtained plastic additive masterbatch are dense, and the anti-shear and compressive strength is large, and the compressive strength can reach 80-180 N. There is almost no dust during the customer's use process, which relatively reduces the environmental protection and safety risks.

[0033] A preparation device for a plastic additive masterbatch according to the present application, since the preparation process is composed of a specific spraying device, a screw with a deep groove thread, a twin-screw extruder with a specific length-diameter ratio, a specific cyclone cooling device, a granulator, etc., and granulation is carried out by a hot granulation method, so that the plastic powder in the plastic additive masterbatch does not need to be melted. Therefore, the preparation device for a plastic additive masterbatch according to the present application has the characteristics of low energy consumption, simple process operation, convenience, etc. during use.

[0034] Based on the above results, using a preparation device for a plastic additive masterbatch according to the present application, under specific preparation process conditions, when the concentration of the plastic additive is ≥20%, the obtained plastic additive masterbatch not only has uniform particle size, but also has characteristics such as low powder rate, high compressive strength, and high anti-shear and compressive strength. Detailed implementation manners

[0035] The present application will be explained below through specific examples, but the present application is not limited thereto.

[0036] The method for detecting the powder rate of the plastic additive masterbatch obtained in each embodiment of the present application: The equipment used for powder rate detection is a numerical control inspection sieve (the sieve mesh aperture is 0.5 mm), model: BA-JYS-300, produced by Shanghai Ru'ang Ultrasonic Equipment Co., Ltd.; Vibrating glass balls: 30 glass balls with a diameter of 16-18 mm; The method for detecting the powder rate is as follows: Set the time of the numerical control inspection sieve to 5 min; Pour 200 g of the plastic additive masterbatch sample obtained in each embodiment into the sieve mesh of the numerical control inspection sieve, and then add 30 glass balls with a diameter of 16-18 mm; Fix the sieve mesh, turn on the numerical control inspection sieve, stop after 5 min, collect and weigh the sieved powder, and calculate the weight percentage of the collected powder in the plastic additive masterbatch sample (200 g) as the powder rate (wt%).

[0037] The method for testing the compressive strength: GB / T 44750—2024.

[0038] The information about the equipment names, models, and manufacturers used in the preparation of each embodiment of this application is as follows: 1. Mixing equipment: Conical mixer, model VSH-2PA, produced by Shanghai Shenyin Machinery (Group) Co., Ltd.; High-speed mixer, model SHR 500, produced by Jiangsu Baixiong Machinery Co., Ltd.; 2. Spraying equipment: (1). Porosity of the nozzle, 40%; (2). Spraying aperture, select a spraying aperture of 0.4 mm; (3). Spraying pressure: Keep the spraying pressure at 0.15 Mpa; (4). Nozzle type: Use atomizing nozzles.

[0039] 3. Twin-screw extruder: Parallel counter-rotating outward twin-screw extruder with a length-to-diameter ratio of 12:1, 4:1, 20:1, 36:1, 48:1, model SPJ-90, produced by Nanjing Jiete Electromechanical Co., Ltd. (the threads of the screws are all deep-groove threads); Parallel co-rotating twin-screw extruder with a length-to-diameter ratio of 12:1, 16:1, model SHJ-92, produced by Nanjing Jiete Electromechanical Co., Ltd. (the threads of the screws are all deep-groove threads); 4. Enclosed spiral air-cooled steel belt: Model WFT, produced by Weibol Vibrating Technology (Shanghai) Co., Ltd.; its steel belt length is 60 m, the steel belt is made of 304 stainless steel, with 2 cold air inlets and 2 hot air outlets, and the positions of the cold air inlets and hot air outlets are opposite.

[0040] 5. Granulator: Two-roll crusher with diagonal lines on the rolls, model 2GPC36270, produced by Jiangsu Fuyi Machinery Technology Co., Ltd.; 6. Screening machine: Straight vibrating screen, model LW-0520-2S, produced by Shanghai Laiwei Machinery Equipment Co., Ltd.

[0041] All kinds of raw materials used in each embodiment of this application are commercially available.

[0042] Example 1 A low-temperature preparation method of a plastic additive masterbatch, and the raw materials used in the preparation are calculated by mass percentage, and its composition and content are as follows: Plastic powder 30% Plastic additive 70%; The raw materials used for the preparation of the plastic additive are composed of a solid powder plastic additive and a liquid plastic additive, and the mass ratio of the solid powder plastic additive to the liquid plastic additive is 1:0.3; The solid powder plastic additive is a composite of powdered hindered phenol antioxidant 1098 and phosphite antioxidant 9228 in a mass ratio of 1:1; The powdered hindered phenol antioxidant 1098 is Irganox 1098; the phosphite antioxidant 9228 is Doverphos S-9228 The liquid plastic additive is a composite of liquid plasticizer white oil and liquid light stabilizer UV400 in a mass ratio of 1:1; The white oil is Karamay naphthenic base white oil KN4010; The liquid light stabilizer UV400 is BASF TINUVIN 400; The plastic powder is polyamide 66 plastic powder, and the polyamide 66 plastic powder is Henan Shenma polyamide EPR24 powder with a particle size of 40 - 200 mesh.

[0043] The following is a low-temperature preparation method for the above-mentioned plastic additive masterbatch, which includes the following steps: (1) Preparation of plastic additive: Stir and mix the powdered hindered phenol antioxidant 1098 and phosphite antioxidant 9228 in the solid powder plastic additive in the raw materials for preparing the plastic additive at a rotation speed of 300 r / min to obtain a mixed powder; Mix the liquid plastic additive in the raw materials for preparing the plastic additive, namely liquid plasticizer white oil and liquid light stabilizer UV400, evenly and then heat to 50 °C, and then control the spraying pressure to 0.15 Mpa and the spraying rate to 3 L / min / m 2 Spray it on the mixed powder. During the spraying process, continue to control the rotation speed at 300 r / min for mixing. After the spraying is completed, continue to stir and mix for 10 min to obtain the plastic additive; (2) Preparation of plastic additive masterbatch: [[ID= During the above feeding process, the feeding rate of the plastic powder is controlled at 120 g / min, and the feeding rate of the plastic additive is 280 g / min; During the above cyclone cooling, a closed spiral air-cooled steel belt is used for cooling. During the cooling process, cold air at a temperature of 10 - 15 °C is used to control the temperature of the material extruded by the twin-screw extruder to drop to 40 °C; During the granulation process in step (2) above, a pair-roll crusher with inclined lines on the rolls is used, and the distance between the pair of rolls is controlled at 3 mm; The obtained plastic additive masterbatch has uniform particle size, all with a diameter of 3 mm and a length of 2 - 5 mm.

[0044] The obtained plastic additive masterbatch is measured to have a powder rate of 0.3 wt% and a compressive strength of 167 N.

[0045] Example 2 A low-temperature preparation method of a plastic additive masterbatch, the raw materials used in the preparation are calculated by mass percentage, and their composition and content are as follows: Plastic powder 80% Plastic additive 20%; The above-mentioned plastic powder and plastic additive are the same as those in Example 1.

[0046] For the above low-temperature preparation method of a plastic additive masterbatch, only during the granulation process in step (2), the working temperature of the parallel counter-rotating outward twin-screw extruder (aspect ratio 12:1) is adjusted to 210 °C, and the others are the same as the preparation method in Example 1, obtaining a plastic additive masterbatch.

[0047] The obtained plastic additive masterbatch has uniform particle size, all with a diameter of 3 mm and a length of 2 - 5 mm.

[0048] The obtained plastic additive masterbatch is measured to have a powder rate of 0.6 wt% and a compressive strength of 135 N.

[0049] Example 3 A low-temperature preparation method of a plastic additive masterbatch, the raw materials used in the preparation are calculated by mass percentage, and their composition and content are as follows: Plastic powder 50% Plastic additive 50%; The above-mentioned plastic powder and plastic additive are the same as those in Example 1.

[0050] For the above low-temperature preparation method of a plastic additive masterbatch, it is the same as the preparation method in Example 1, obtaining a plastic additive masterbatch.

[0051] The obtained rubber additive masterbatch has uniform particle size, all being cylindrical particles with a diameter of 3 mm and a length of 2 - 5 mm.

[0052] The obtained rubber auxiliary masterbatch is measured to have a powder rate of 0.3 wt% and a compressive strength of 162 N.

[0053] Example 4 A low-temperature preparation method of a plastic auxiliary masterbatch. The raw materials used for preparing the plastic auxiliary masterbatch are calculated by mass percentage, and their composition and content are as follows: Plastic powder 0% Plastic auxiliary 100%; The plastic powder is the same as that in Example 1; The dosage of the raw materials used for preparing the plastic auxiliary is in a mass ratio of solid powder plastic auxiliary: liquid plastic auxiliary of 1:0.1, and the solid powder plastic auxiliary and the liquid plastic auxiliary are the same as those in Example 1.

[0054] The above low-temperature preparation method of the plastic auxiliary masterbatch includes the following steps: (1) Preparation of plastic auxiliary: The same as the preparation steps of the plastic auxiliary in Example 1; (2) Preparation of plastic auxiliary masterbatch: Using a parallel co-rotating twin-screw extruder (length-diameter ratio 12:1), closing the side feeding, and feeding the plastic auxiliary in the main feeding mode. During the feeding process, according to the composition and content of the plastic auxiliary, the working temperature of the parallel co-rotating twin-screw extruder (150 °C in this example) is adjusted to make at least 15% of the plastic auxiliary in the screw melt and mix evenly with the un-melted plastic auxiliary. The material with a certain shape (the die of the twin-screw extruder is sheet-shaped) extruded by the twin-screw extruder ( The thermally mixed and uniform material of the plastic auxiliary and the plastic powder ) Then, it is successively subjected to cyclone cooling, pelletizing, and screening to obtain the plastic auxiliary masterbatch; During the above feeding process, the feeding rate of the plastic auxiliary is 280 kg / h.

[0055] The obtained rubber auxiliary masterbatch has uniform particle size, all of which are irregular small particles with a thickness of 2 mm and a length of 4 - 6 mm.

[0056] The obtained rubber auxiliary masterbatch is measured to have a powder rate of 0.3 wt% and a compressive strength of 139 N.

[0057] Example 5 A low-temperature preparation method of a plastic auxiliary masterbatch. The dosage of the raw materials used for preparing the plastic auxiliary masterbatch is calculated by mass percentage, and its composition and content are as follows: Plastic powder 30% Plastic auxiliary 70%; The plastic powder is the same as that in Example 1; The raw materials used for preparing the plastic additive are solid powder plastic additives, and the solid powder plastic additives are composed of powdered hindered phenol antioxidant 1098 and phosphite antioxidant 9228 compounded in a mass ratio of 1:1; The powdered hindered phenol antioxidant 1098 is Irganox 1098; the phosphite antioxidant 9228 is Doverphos S-9228.

[0058] The low-temperature preparation method of the above plastic additive masterbatch includes the following steps: (1) Preparation of plastic additives (no liquid plastic additives in the plastic additives, no spraying during the preparation process): Stir and mix hindered phenol antioxidant 1098 and phosphite 9228 at a rotation speed of 300 r / min to obtain plastic additives; (2) Preparation of plastic additive masterbatch: Use a parallel co-rotating twin-screw extruder with a length-diameter ratio of 12:1. The plastic additives are fed in the main feeding mode, and the polyamide 66 powder is fed in the side feeding mode. During the feeding process, according to the composition and content of the plastic additives, adjust the working temperature of the parallel co-rotating twin-screw extruder (150 °C in this example) to make at least 15% of the plastic additives in the screw melt and mix evenly with the unmelted plastic additives and plastic powder. The material (the thermally mixed and evenly distributed material of plastic additives and plastic powder) with a certain shape (sheet-shaped by the die of the extruder) extruded by the parallel co-rotating twin-screw extruder is then successively subjected to cyclone cooling, pelletizing, and screening to obtain the plastic additive masterbatch; During the above feeding process, control the feeding rate of the plastic powder to be 120 kg / h and the feeding rate of the plastic additives to be 280 kg / h.

[0059] The obtained plastic additive masterbatch has uniform particle size and is irregular small particles with a thickness of 2 mm and a length of 4 - ٠6 mm.

[0060] The obtained plastic additive masterbatch is measured to have a powder rate of 0.4 wt% and a compressive strength of 141 N.

[0061] Example 6 A low-temperature preparation method of a plastic additive masterbatch. The usage amounts of the raw materials used for preparing the plastic additive masterbatch are calculated by mass percentage, and its composition and content are as follows: Plastic powder 30% Plastic additives 7٠%; The plastic powder is the same as that in Example 1; The dosages of the raw materials used for preparing the plastic auxiliary agent are as follows: the mass ratio of the solid powder plastic auxiliary agent to the liquid plastic auxiliary agent is 1:0.2, and the solid powder plastic auxiliary agent and the liquid plastic auxiliary agent are the same as those in Example 1.

[0062] For the above-mentioned low-temperature preparation method of the plastic auxiliary agent masterbatch, only the die of the twin-screw extruder is sheet-shaped, and the others are the same as the preparation method in Example 1, and finally the plastic auxiliary agent masterbatch is obtained.

[0063] The obtained rubber auxiliary agent masterbatch has uniform particle size and is irregular small particles with a thickness of 2 mm and a length of 1-3 mm.

[0064] The obtained rubber auxiliary agent masterbatch is measured to have a powder rate of 0.3 wt% and a compressive strength of 180 N.

[0065] Examples 7-12 A low-temperature preparation method of a plastic auxiliary agent masterbatch, the raw materials used for preparing the plastic auxiliary agent masterbatch are calculated by mass percentage, and its composition and content are the same as those in Example 1.

[0066] For the above-mentioned low-temperature preparation method of the plastic auxiliary agent masterbatch, only the parallel co-rotating twin-screw extruder (aspect ratio 12:1), parallel co-rotating twin-screw extruder (aspect ratio 16:1), parallel counter-rotating outward twin-screw extruder (aspect ratio 4:1), parallel counter-rotating outward twin-screw extruder (aspect ratio 20:1), parallel counter-rotating outward twin-screw extruder (aspect ratio 36:1), parallel counter-rotating outward twin-screw extruder (aspect ratio 48:1) are used in the preparation process, and the others are the same as the preparation method in Example 1, and the dies of the twin-screw extruders in Examples 7-12 are also the same as that in Example 1, and finally the plastic auxiliary agent masterbatch is obtained.

[0067] The particle size, powder rate, and compressive strength of the plastic auxiliary agent masterbatch obtained in the above examples are detected, and the results are as follows in the table: From the comparison results of Examples 1-12 in the above table, it shows that for the low-temperature preparation method of a plastic auxiliary agent masterbatch of the present application, the use concentration of the plastic auxiliary agent can reach 20-100%, and the finally obtained plastic auxiliary agent masterbatch not only has uniform particle size, but also has the characteristics of low powder rate (detected <1 wt%) and high compressive strength. Therefore, the anti-shear and compressive strength of the obtained plastic auxiliary agent masterbatch particles is also high.

[0068] From the data comparison of Examples 1, 7, and ⑧ in the above table, it can be seen that the extrusion effect of the parallel co-rotating extruder is much worse than that of the parallel counter-rotating outward twin-screw extruder, and the powder rate will increase. Therefore, it is preferably to use the parallel counter-rotating outward twin-screw extruder.

[0069] The comparison results of Examples 1 and 9-12 show that in the low-temperature preparation method of a plastic auxiliary masterbatch of the present application, the length-diameter ratio of the co-rotating twin-screw extruder from 4:1 to 48:1 can all achieve that the plastic auxiliary masterbatch not only has uniform particle size, but also has a low powder ratio and high compressive strength. The powder ratio is 0.3-0.8 wt%, and the compressive strength is 109-167 N. The preferred length-diameter ratio is 4:1-20:1, and more preferably the length-diameter ratio is 12:1. The lowest powder ratio of the obtained plastic auxiliary masterbatch is 0.3 wt%, and the highest compressive strength can reach 180 N.

[0070] Example 13 A low-temperature preparation method of a plastic auxiliary masterbatch, the dosage of the raw materials used in the preparation of the plastic auxiliary masterbatch is calculated by mass percentage, and its composition and content are as follows: Plastic powder 40% Plastic auxiliary 60%; The plastic powder is polypropylene powder, with the model of Sinopec Yanshan K8303 and a melting point of 180 °C; The raw materials used in the preparation of the plastic auxiliary are compounded by an antioxidant and a lubricant in a mass ratio of 1:0.5; The antioxidant is a powdery hindered phenolic antioxidant 1010 and a phosphite antioxidant 168 compounded in a mass ratio of 1:1; The lubricant is oleic acid amide.

[0071] The above low-temperature preparation method of the plastic auxiliary masterbatch includes the following steps: (1) Preparation of plastic auxiliary (the plastic auxiliary does not contain liquid plastic auxiliary, and there is no spraying during the preparation process): Stir and mix the hindered phenolic antioxidant 1010, phosphite 168 and oleic acid amide at a rotation speed of 300 r / min to obtain the plastic auxiliary; (2) Preparation of plastic auxiliary masterbatch: An outwardly rotating parallel twin-screw extruder with a length-diameter ratio of 12:1 is adopted. The plastic additives are fed in the main feeding mode, and the polypropylene powder is fed in the side feeding mode. During the feeding process, according to the composition and content of the plastic additives, the working temperature of the outwardly rotating parallel twin-screw extruder is adjusted (the starting temperature of the extruder is 65 - 70 °C, and the temperature drops to 40 °C after stable operation for 30 min, and 40 °C is the working temperature of the extruder) so that at least 15% of the plastic additives in the screw are melted and evenly mixed with the unmelted plastic additives and plastic powder. The material (the thermally and evenly mixed material of plastic additives and plastic powder) with a certain shape (sheet-shaped by the die of the extruder) extruded by the outwardly rotating parallel twin-screw extruder is then successively subjected to cyclone cooling, granulation, and screening to obtain the plastic additive masterbatch; during the above feeding process, the feeding rate of the plastic powder is controlled at 120 kg / h, and the feeding rate of the plastic additives is controlled at 280 kg / h.

[0072] The obtained plastic additive masterbatch has uniform particle size and is irregular small particles with a thickness of 2 mm and a length of 2 - 5 mm.

[0073] The obtained plastic additive masterbatch is measured to have a powder rate of 0.4 wt% and a compressive strength of 80 N.

[0074] Example 14 A low-temperature preparation method of a plastic additive masterbatch. The usage amounts of the raw materials used for preparing the plastic additive masterbatch are calculated by mass percentage, and its composition and content are as follows: Plastic powder 40% [[ID=……]]Plastic additives 60%; The plastic powder is polypropylene powder, with the model of Sinopec Yanshan K8303 and a melting point of 180 °C; The raw materials used for preparing the plastic additives are solid powder plastic additives; The solid powder plastic additives are composed of powdered hindered phenol antioxidant 1010 and phosphite antioxidant 168 compounded in a mass ratio of 1:2.

[0075] The above low-temperature preparation method of the plastic additive masterbatch includes the following steps: (1) Preparation of plastic additives (the plastic additives do not contain liquid plastic additives and there is no spraying during the preparation process): The hindered phenol antioxidant 1010 and phosphite 168 are stirred and mixed evenly at a rotation speed of 300 r / min to obtain the plastic additives; (2) Preparation of the plastic additive masterbatch: An outwardly rotating parallel twin-screw extruder with a length-diameter ratio of 12:1 is used. The plastic additives are fed in the main feeding mode, and the polypropylene powder is fed in the side feeding mode. During the feeding process, according to the composition and content of the plastic additives, the working temperature of the outwardly rotating parallel twin-screw extruder is adjusted (the starting temperature of the extruder is 115-120 °C, and the temperature drops to 105 °C after stable operation for 30 min, and 105 °C is the working temperature of the extruder) so that at least 15% of the plastic additives in the screw are melted and mixed evenly with the unmelted plastic additives and plastic powder. The material (the thermally mixed and evenly distributed material of plastic additives and plastic powder) with a certain shape (determined by the die shape of the extruder, which is a 3-mm round hole die in this embodiment) extruded by the outwardly rotating parallel twin-screw extruder is then successively subjected to cyclone cooling, pelletizing, and screening to obtain the plastic additive masterbatch. During the above feeding process, the feeding rate of the plastic powder is controlled at 120 kg / h, and the feeding rate of the plastic additives is controlled at 280 kg / h.

[0076] The obtained plastic additive masterbatch has uniform particle sizes, all with a diameter of 3 mm and a length of 2-5 mm.

[0077] The obtained plastic additive masterbatch is measured to have a powder rate of 0.3 wt% and a compressive strength of 165 N.

[0078] Example 15 A low-temperature preparation method of a plastic additive masterbatch, and the raw materials used in the preparation are calculated by mass percentage, and their composition and content are as follows: Plastic powder 30% Plastic additives 70%; The raw materials used in the preparation of the plastic additives are composed of a solid powder plastic additive and a liquid plastic additive in a composite manner, and the mass ratio of the solid powder plastic additive to the liquid plastic additive is 1:0.5; The solid powder plastic additive is composed of the powdered flame retardant hydroquinone bis(diphenyl phosphate) and the nucleating agent silica in a mass ratio of 4:1; The liquid plastic additive is the flame retardant bisphenol A-bis(diphenyl phosphate); The plastic powder is PC powder, and the PC powder model is Covestro ET3117 with a particle size of 120 mesh.

[0079] The above low-temperature preparation method of a plastic additive masterbatch includes the following steps: (1). Preparation of plastic additives: The flame retardant hydroquinone bis(diphenyl phosphate) and the nucleating agent silica are stirred and mixed evenly at a rotation speed of 300 r / min to obtain the well-mixed solid powder plastic additive; Heat the flame retardant bisphenol A - bis(diphenyl phosphate) to 60°C, and then control the spraying pressure at 0.15 Mpa and the spraying rate at 3 L / min / m 2 Spray it onto the mixed solid powdered plastic additives. During the spraying process, continue to control the rotation speed at 300 r / min for mixing. After the spraying is completed, continue to stir and mix for 10 min to obtain plastic additives; (2) Preparation of plastic additive masterbatch: Use a parallel co - rotating twin - screw extruder (length - diameter ratio 12:1). The plastic additives are fed in the main feeding mode, and the plastic powder is fed in the side feeding mode. During the feeding process, according to the composition and content of the plastic additives, adjust the working temperature of the parallel co - rotating twin - screw extruder (the starting temperature of the extruder is 100°C, and the temperature drops to 85°C after stable operation for 30 min. 85°C is the working temperature of the extruder) so that at least 15% of the plastic additives in the screw are melted and mixed evenly with the unmelted plastic additives and plastic powder. The material (the thermally - mixed and evenly - distributed material of plastic additives and plastic powder) with a certain shape (determined by the die shape of the extruder, a 3 - mm round - hole die in this embodiment) extruded by the parallel co - rotating twin - screw extruder is then successively cooled by a cyclone, pelletized, and screened to obtain the plastic additive masterbatch; During the above - mentioned feeding process, control the feeding rate of the plastic powder at 120 g / min and the feeding rate of the plastic additives at 280 g / min; The above - mentioned cyclone cooling is carried out by a closed - type spiral air - cooled steel belt. During the cooling process, cold air at a temperature of 10 - 15°C is used to control the temperature of the material extruded by the twin - screw extruder to drop to 40°C; The granulation process in step (2) above uses a pair - roll crusher with inclined lines on the rolls, and control the distance between the pair of rolls at 3 mm; The obtained plastic additive masterbatch has uniform particle size, all with a diameter of 3 mm and a length of 2 - 5 mm.

[0080] The obtained plastic additive masterbatch is measured to have a powder rate of 0.6 wt% and a compressive strength of 98 N.

[0081] As can be seen from Examples 1, 13 - 15, using the low - temperature preparation method of the plastic additive masterbatch of the present application, the plastic additive masterbatch prepared from polyamide 66 powder, polypropylene powder or polycarbonate powder without melting has a plastic additive content of over 60%, a powder rate as low as within 0.6 wt%, and a compressive strength as high as 80 - 167 N.

[0082] Comparative Example Comparative Example 1 A preparation method of a plastic additive masterbatch. The usage amounts of the raw materials used for preparing the plastic additive masterbatch are calculated by mass percentage, and its composition and content are as follows: Plastic powder: 40% Plastic additives: 60%; The plastic powder is polypropylene powder, with the model of Sinopec Yanshan K8303 and a melting point of 180°C; The raw materials used for preparing the plastic additives are compounded by an antioxidant and a lubricant in a mass ratio of 1:0.5; The antioxidant is a powdered hindered phenol antioxidant 1010 and a phosphite antioxidant 168 compounded in a mass ratio of 1:1; The lubricant is oleic acid amide.

[0083] The preparation method of the above plastic additive masterbatch includes the following steps: (1) Preparation of plastic additives: Same as Example 13, obtaining plastic additives; (2) Preparation of plastic additive masterbatch: Mix the plastic powder and the plastic additives evenly, and then use a flat die machine with a grinding disc diameter of 300 mm and a die hole diameter of 3 mm for cold pressing granulation. After screening the prepared particles, a plastic additive masterbatch is obtained; The obtained plastic additive masterbatch has uniform particle size, which is cylindrical particles with a diameter of 3 mm and a length of 3 - 8 mm.

[0084] The obtained plastic additive masterbatch is measured to have a powder rate of 2.5 wt% and a compressive strength of 47 N.

[0085] Comparing Example 13 with Comparative Example 1, it can be seen that compared with Example 13, Comparative Example 1 uses a cold granulation method to prepare the plastic additive masterbatch, and the compressive strength is as low as 47 N. This shows that the plastic additive masterbatch prepared by the preparation method of the present application can improve the compressive strength and reduce the cost.

[0086] Comparative Example 2 A preparation method of a plastic additive masterbatch, the composition and content of the raw materials used for its preparation are calculated by mass percentage as follows: Plastic powder: 50% Plastic additives: 50%; The plastic powder and plastic additives are the same as those in Example 1.

[0087] The above preparation method of a plastic additive masterbatch includes the following steps: (1) Preparation of plastic additives: The same as Example 1, obtaining plastic additives.

[0088] (2) Preparation of plastic additive masterbatch: A parallel co-rotating twin-screw extruder with a length-to-diameter ratio of 12:1 is used. The plastic additives are fed in the main feeding mode, and the plastic powder is fed in the side feeding mode. During the feeding process, according to the composition and content of the plastic additives, the working temperature of the parallel co-rotating twin-screw extruder is adjusted (275 °C in this comparative example). At this time, all the plastic powder melts, and all the plastic additives also melt. The extruded material from the extruder does not take shape, and the plastic additives and the plastic powder are not well compatible. Therefore, subsequent operations such as cyclone cooling, granulation, and screening are not carried out anymore.

[0089] During the above feeding process, the feeding rate of the plastic powder is controlled at 120 g / min, and the feeding rate of the plastic additives is controlled at 280 g / min.

[0090] Comparative Example 3 A method for preparing a plastic additive masterbatch, the raw materials used in the preparation are calculated by mass percentage, and their composition and content are as follows: Plastic powder 90% Plastic additives 10%; The above-mentioned plastic powder and plastic additives are the same as those in Example 1.

[0091] The above-mentioned method for preparing a plastic additive masterbatch includes the following steps: (1) Preparation of plastic additives: The same as in Example 1 to obtain plastic additives; (2) Preparation of plastic additive masterbatch: A parallel co-rotating twin-screw extruder with a length-to-diameter ratio of 12:1 is used. The plastic additives are fed in the main feeding mode, and the plastic powder is fed in the side feeding mode. During the feeding process, according to the composition and content of the plastic additives, the working temperature of the parallel co-rotating twin-screw extruder is adjusted (275 °C in this comparative example) to melt and mix the plastic additives and the plastic powder evenly in the screw. The material (the thermally mixed and evenly distributed material of the plastic additives and the plastic powder) with a certain shape (determined by the die shape of the extruder, a 3 mm round hole die in this example) extruded from the parallel co-rotating twin-screw extruder is then successively subjected to cyclone cooling, granulation, and screening to obtain the plastic additive masterbatch; During the above feeding process, the feeding rate of the plastic powder is controlled at 120 g / min, and the feeding rate of the plastic additives is controlled at 280 g / min; The above-mentioned cyclone cooling is carried out using a closed spiral air-cooled steel belt for cooling. During the cooling process, cold air at a temperature of 10 - 15 °C is used to control the temperature of the material extruded from the twin-screw extruder to drop to 40 °C; The granulation process in the above step (2) uses a gantry type granulator for granulation; The obtained plastic additive masterbatch has uniform particle sizes, all with a diameter of 3 mm and a length of 2 - 5 mm.

[0092] The obtained plastic additive masterbatch was measured, with a powder rate of 0 wt% and a compressive strength of 200 N.

[0093] The aging performance of Example 1 and Comparative Example 3 was detected. The detection method was as follows: 11.43 g of the masterbatch prepared in Example 1 was added to 1988.57 g of nylon 66 (model: EPR24) pellets. 80 g of the masterbatch prepared in Comparative Example 2 was added to 1920 g of nylon 66 (model: EPR24) pellets. After mixing evenly, the mixture was extruded and pelletized by an extruder, and the pellets were collected and injection-molded into sheet specimens of 80 mm * 60 mm * 2 mm by an injection molding machine. Then, the specimens were aged at 90 °C for 72 h, and the YI E313 (D65 / 10) and ΔYI E313 (D65 / 10) before and after aging were measured. Number Example 1 Comparative Example 3 Initial YI 18.8 19.2 YI after aging 26.5 29.3 ΔYI 7.7 10.1

[0094] As can be seen from the above table, the masterbatch prepared in Example 1 has a better color protection effect on plastic powder. This shows that by using the preparation method of the present application, not only can the concentration of plastic additives in the masterbatch be increased, but also the anti-aging performance of the masterbatch can be improved.

[0095] The specific embodiments of the present application are only explanations of the present application, and they do not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, 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 method for preparing a plastic auxiliary masterbatch at low temperature, characterized in that, The raw materials used for preparing the plastic additive masterbatch are calculated by mass percentage, and their composition and content are as follows: Plastic powder 0 - 80% Plastic additives 20 - 100%; The plastic additive masterbatch is prepared by using a twin-screw extruder. The plastic additives are fed in the main feeding mode, and the plastic powder is fed in the side feeding mode. Adjust the working temperature of the twin-screw extruder to make the materials in the screw reach a uniform plasticized state. The materials extruded by the twin-screw extruder are then successively subjected to cyclone cooling, pelletizing, and screening to finally obtain the plastic additive masterbatch; When the content of the plastic powder is 0%, the side feeding is closed, and the twin-screw extruder works only in the main feeding mode; The threads on the screw of the twin-screw extruder are deep groove threads.

2. The low-temperature preparation method of a plastic auxiliary masterbatch according to claim 1, characterized in that, The feeding rate of the side feeding is 0 - 380 kg / h, and the feeding rate of the main feeding is 20 - 400 kg / h; The working temperature of the twin-screw extruder is 40 - 180 °C; The plastic powder is polyamide 66 powder, polycarbonate powder, acrylonitrile-butadiene-styrene copolymer powder, or polypropylene powder.

3. A low-temperature preparation method of a plastic additive masterbatch as claimed in claim 1, characterized in that: The raw materials used for preparing the plastic additives are solid powder plastic additives, or a composite of solid powder plastic additives and liquid plastic additives, with the mass ratio of solid powder plastic additives: liquid plastic additives being 1:0.1 - 0.3; The solid powder plastic additives include one or a composite of two or more of powdered antioxidants, light stabilizers, lubricants, and nucleating agents; The liquid plastic additives include one or a composite of two or more of liquid antioxidants, liquid light stabilizers, liquid flame retardants, and liquid plasticizers.

4. A low-temperature preparation method of a plastic additive masterbatch as claimed in claim 3, characterized in that When the raw materials used for preparing the plastic additives are solid powder plastic additives, the preparation steps of the plastic additives are as follows: Mix the solid powder plastic additives evenly to obtain the plastic additives; When the raw materials used for preparing the plastic additives are a composite of solid powder plastic additives and liquid plastic additives, the preparation steps of the plastic additives are as follows: First, mix the solid powder plastic additives evenly to obtain a mixed powder; Then, the liquid plastic additives are mixed evenly. After the obtained liquid mixture is heated to 40 - 60 °C, the pressure is controlled at 0.1 - 0.2 Mpa and the spraying rate is 2 - 7 L / min / m under stirring conditions. 2 It is sprayed onto the above - obtained mixed powder. After the spraying is completed, stirring and mixing are continued for 5 - 20 min to obtain plastic additives.

5. The low-temperature preparation method of a plastic auxiliary masterbatch as described in claim 1, characterized in that, The twin-screw extruder is a co-rotating parallel twin-screw extruder or a counter-rotating parallel twin-screw extruder with an outer direction, and its length-diameter ratio is 4:1 - 48:

1.

6. The low-temperature preparation method of a plastic auxiliary masterbatch according to claim 5, characterized in that, For the counter-rotating parallel twin-screw extruder with an outer direction, its length-diameter ratio is 4:1 - 20:

1.

7. A low-temperature preparation method of a plastic additive masterbatch as claimed in claim 6, characterized in that The length-diameter ratio of the counter-rotating parallel twin-screw extruder with an outer direction is 12:

1.

8. The low-temperature preparation method of a plastic auxiliary masterbatch as described in claim 1, wherein, During the cyclone cooling process, the cold air temperature is controlled at 10 - 15 °C.

9. A low-temperature preparation method of a plastic additive masterbatch as claimed in claim 1, characterized in that For the cyclone cooling, a closed spiral air-cooled steel belt is used for cooling. The closed spiral air-cooled steel belt has 1 - 2 cold air inlets and 1 - 2 hot air outlets, and the positions of the cold air inlets and the hot air outlets are opposite; The granulation is carried out by a granulator, which is a pair-roll crusher with oblique lines on the rolls, a swing granulator with a drum that can rotate forward and backward, an impact blade crusher or a shredder with a moving blade and a fixed blade.

10. A preparation device for a plastic auxiliary masterbatch, characterized in that, It includes a spraying device, a twin-screw extruder, an air-cooled steel belt with a closed spiral, a granulator and a screening machine; For the spraying device described above, the nozzle is an atomizing nozzle or a rotating nozzle, the porosity of the nozzle is 30-50%, and the spraying aperture is 0.3-0.6 mm; The twin-screw extruder is a parallel co-rotating twin-screw extruder or a parallel counter-rotating twin-screw extruder with deep-groove threads on the screws; The air-cooled steel belt with a closed spiral has 1-2 cold air inlets and 1-2 hot air outlets, and the positions of the cold air inlet and the hot air outlet are opposite; The granulator is a pair-roll crusher with oblique lines on the rolls, a swing granulator with a drum that can rotate forward and backward, an impact blade crusher or a shredder with a moving blade and a fixed blade.

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