A recycling system and process for plastic masterbatch

Abstract

The invention discloses a recycling system and process for plastic masterbatches. The plastic masterbatches are subjected to pretreatment, differentiation treatment and purification treatment in sequence by using a pretreatment unit, a differentiation unit, a purification unit and a transport unit. The pretreatment unit processes the plastic masterbatches into particles with consistent particle size and glossiness. In the subsequent potassium chromate treatment, the chroma and glossiness of organic masterbatches and inorganic masterbatches can be more obviously contrasted. After the chroma and glossiness of the plastic masterbatches with consistent particle size and glossiness are changed, the consistency of the particles in the subsequent treatment process can be ensured, and the accuracy of the differentiation process is improved. The potassium chromate treatment in the differentiation treatment can change the glossiness and chroma of the organic masterbatches and the inorganic masterbatches. The organic masterbatches and the inorganic masterbatches can be differentiated according to the glossiness and chroma changes of the organic masterbatches and the inorganic masterbatches after the potassium chromate treatment, thereby solving the defect in the prior art that the organic and inorganic masterbatches cannot be accurately recycled respectively.

Description

Technical Field

[0001] The invention relates to a plastic masterbatch, and in particular to a recycling system and process for the plastic masterbatch. Background Art

[0002] Plastic masterbatch is a new type of colorant for polymer materials, also known as pigment preparation, which is composed of three basic elements: pigment or dye, carrier resin and additives. Among them, the pigment or dye provides the required color, the carrier resin acts as a carrier of the pigment to evenly disperse the pigment in the plastic, and the additive is used to improve the processing performance of the masterbatch and the performance of the final product.

[0003] The main function of plastic masterbatch is to increase the decorativeness and aesthetics of plastic products. When producing plastic products, people can add masterbatches of different colors as needed and mix them evenly during the production process to make plastic products of various colors, such as plastic bags, plastic plates, plastic cups, etc.

[0004] Plastic masterbatches use both organic and inorganic masterbatches during use. The inorganic pigments and fillers in inorganic masterbatches can sometimes enhance the physical properties of plastic products, such as hardness, wear resistance, impact resistance, etc. Organic masterbatches usually have good dispersibility and can be evenly dispersed in the plastic substrate. The mixed use of organic and inorganic masterbatches can ensure the uniformity of the plastic masterbatch while ensuring that the plastic masterbatch has good physical properties, and can improve the color stability.

[0005] Prior art CN 111229708 A discloses a method for recycling plastic particles, comprising a bottom plate, a filtrate device, a cleaning device, a sewage tank and a material receiving tank, wherein a filtrate device is installed on the upper end of the bottom plate, a cleaning device is installed on the upper end of the filtrate device, and a sewage tank is arranged in the middle part below the filtrate device, and the sewage tank is installed on the bottom plate. The problem that the existing equipment cannot realize the automatic water injection and water stop function when cleaning the plastic particles during the recycling and treatment of plastic particles, thereby increasing the waste of cleaning liquid during the material feeding process, and increasing manpower and material resources, and increasing the cost of cleaning, and at the same time, water storage treatment cannot be performed, so that the surface of the plastic particles is easily cleaned incompletely, and the use of cleaning liquid is increased, which will reduce the use efficiency of the cleaning liquid, and after the cleaning is completed, the phenomenon of mud and sand adhesion is easy to occur, thereby reducing the cleaning efficiency and other problems can be completed. The cleaning and recycling of plastic particles can be completed, but when applied to plastic masterbatches containing both organic masterbatches and inorganic masterbatches, accurate distinction cannot be made, and the subsequent reprocessing process will interfere with the processing process.

[0006] Therefore, it is necessary to improve the plastic masterbatch recovery system in the prior art to solve the above problems. Summary of the invention

[0007] The present invention overcomes the shortcomings of the prior art and provides a recycling system and process for plastic masterbatches, aiming to solve the defect that the prior art plastic masterbatches cannot accurately recycle organic and inorganic masterbatches respectively.

[0008] To achieve the above object, the technical solution adopted by the present invention is: a recycling process of plastic masterbatch, comprising the following steps:

[0009] S1: Plastic masterbatches include organic masterbatches and inorganic masterbatches of the same chromaticity. The plastic masterbatches are crushed, polished and cleaned in sequence to ensure that the outer diameter and glossiness of the plastic masterbatches are consistent;

[0010] S2: treating the plastic masterbatch with potassium chromate, distinguishing the organic masterbatch from the inorganic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch, and preliminarily sorting the distinguished organic masterbatch and inorganic masterbatch, and recording the number of the organic masterbatch and inorganic masterbatch after the preliminary sorting, wherein the potassium chromate treatment is to immerse the plastic masterbatch in a potassium chromate solution with a concentration of 0.5%-2% for a soaking time of 10-30 minutes;

[0011] S3: Purify the organic masterbatch and the inorganic masterbatch after preliminary sorting respectively to obtain purified organic masterbatch and inorganic masterbatch respectively, and record the quantity of the purified organic masterbatch and inorganic masterbatch respectively;

[0012] S4: Compare the quantity of the organic masterbatch and the inorganic masterbatch after the preliminary sorting in S3 with the quantity of the organic masterbatch and the inorganic masterbatch after the purification in S4 to obtain the purification rate, and modify the accuracy of the preliminary sorting process according to the purification rate, wherein the purification rate is the proportion of the quantity of the organic masterbatch and the inorganic masterbatch after the purification to the quantity of the organic masterbatch and the inorganic masterbatch after the preliminary sorting.

[0013] In a preferred embodiment of the present invention, the chromaticity and glossiness changes in S2 are: the chromaticity and glossiness changes of the plastic masterbatch before and after the potassium chromate treatment, and the chromaticity and glossiness changes between the organic masterbatch and the inorganic masterbatch after the potassium chromate treatment.

[0014] In a preferred embodiment of the present invention, the purification treatment in S3 includes: organic purification treatment and inorganic purification treatment, the organic purification treatment is to remove the inorganic masterbatch in the organic masterbatch, and the inorganic purification treatment is to remove the organic masterbatch in the inorganic masterbatch.

[0015] In a preferred embodiment of the present invention, the organic purification treatment in S3 is an acid sprinkling treatment, which is used to spray acid on the organic masterbatch, and after the acid spraying, the chromaticity and glossiness change of the organic masterbatch is detected, and secondary sorting is performed, the acid is dilute sulfuric acid with a concentration of 1%-3%, and the acid sprinkling time is 30min-2h.

[0016] In a preferred embodiment of the present invention, the inorganic purification treatment in S3 is a high-temperature treatment, the inorganic masterbatch is heated at high temperature, and the organic masterbatch is tested for color and glossiness changes after the high-temperature treatment, and a secondary sorting is performed, the heating temperature is 350-400°C, and the heating time is 15-20min.

[0017] In a preferred embodiment of the present invention, the purification rate in S4 includes the total purification rate, the organic masterbatch purification rate and the inorganic masterbatch purification rate. The total purification rate is the proportion of the total number of organic masterbatch and inorganic masterbatch after purification in the total number of organic masterbatch and inorganic masterbatch after sorting. The organic masterbatch purification rate and the inorganic masterbatch purification rate are the proportions of the number before and after purification, respectively.

[0018] In a preferred embodiment of the present invention, the purification rate in S4 is maintained at 95-100%. When the purification rate is lower than 95%, the sorting accuracy is improved. The method for improving the sorting accuracy is to increase the concentration and treatment time of potassium chromate treatment.

[0019] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a control system for the recycling process of plastic masterbatch, including: a pretreatment unit, a differentiation unit, a purification unit and a transportation unit:

[0020] The pretreatment unit is used to pretreatment the plastic masterbatch, and the pretreatment unit includes a crushing unit, a grinding unit and a cleaning unit. The crushing unit crushes the plastic masterbatch, the grinding unit grinds the plastic masterbatch, and the cleaning unit cleans the plastic masterbatch after grinding by the grinding unit;

[0021] The distinguishing unit is used to distinguish and process the plastic masterbatch, and the distinguishing unit includes: a potassium chromate treatment unit, a detection unit and a sorting unit; the potassium chromate treatment unit performs potassium chromate treatment on the plastic masterbatch, and the potassium chromate treatment is to spray the potassium chromate solution onto the plastic masterbatch, and the spraying direction is vertically downward; the detection unit is used to detect the appearance characteristics of the plastic masterbatch, and the detection unit detects the chroma and glossiness of the plastic masterbatch; the sorting unit sorts the plastic masterbatch based on the chroma and glossiness changes;

[0022] The purification unit is used to purify the plastic masterbatch sorted by the differentiation unit, and the purification unit removes the inorganic masterbatch in the organic masterbatch and the organic masterbatch in the inorganic masterbatch respectively;

[0023] The transport unit is connected to the pretreatment unit, the differentiation unit and the purification unit respectively, and transports the plastic masterbatch between the pretreatment unit, the differentiation unit and the purification unit.

[0024] In a preferred embodiment of the present invention, the crushing unit forms plastic masterbatch into particles with uniform outer diameter, the polishing unit polishes the surface of the plastic masterbatch to form spherical particles and makes the glossiness of the surface of the plastic masterbatch uniform, and the cleaning unit cleans the plastic masterbatch debris in the crushing unit and the polishing unit.

[0025] In a preferred embodiment of the present invention, the potassium chromate treatment unit includes a loading platform and a potassium chromate solution sprayer, the loading platform is used to carry plastic masterbatch, the plastic masterbatch is spread flat on the loading platform, the potassium chromate solution sprayer is used to spray potassium chromate solution, the potassium chromate solution sprayer is arranged directly above the loading platform, and the loading platform is arranged horizontally.

[0026] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0027] The invention provides a recycling system for plastic masterbatches. The system utilizes a pretreatment unit, a differentiation unit, a purification unit and a transport unit to sequentially perform pretreatment, differentiation and purification on the plastic masterbatches. The potassium chromate treatment in the differentiation treatment can change the glossiness and chroma of organic masterbatches and inorganic masterbatches, and can accurately differentiate the organic masterbatches from the inorganic masterbatches. Compared with the plastic masterbatch recycling system in the prior art, the system can differentiate the organic masterbatches from the inorganic masterbatches according to the glossiness and chroma changes of the organic masterbatches and the inorganic masterbatches after the potassium chromate treatment, so that the organic masterbatches and the inorganic masterbatches can be differentiated and recycled based on the difference in appearance, thereby ensuring the accuracy in the recycling process and solving the defect that the plastic masterbatch in the prior art cannot accurately recycle the organic and inorganic masterbatches respectively.

[0028] In the present invention, the pretreatment unit processes the plastic masterbatch into particles with consistent particle size and glossiness, which can make the chromaticity and glossiness contrast between the organic masterbatch and the inorganic masterbatch more obvious in the subsequent potassium chromate treatment. Compared with the prior art, the plastic masterbatch with consistent particle size and glossiness can ensure the consistency of the particles in the subsequent processing process after the chromaticity and glossiness are changed, thereby improving the accuracy of the differentiation process.

[0029] In the present invention, potassium chromate treatment is first used and then purification treatment is performed. Potassium chromate can play a synergistic role with the acid sprinkling treatment and the high-temperature treatment in the purification treatment, respectively, so that the discrimination between organic masterbatch and inorganic masterbatch in the purification treatment is more obvious. Compared with the prior art, the potassium chromate treatment and the different reactions between organic masterbatch and inorganic masterbatch can play a distinguishing role, which can enhance the ability to distinguish between organic masterbatch and inorganic masterbatch, improve the purification rate, and improve the accuracy of recovering organic masterbatch and inorganic masterbatch respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a three-dimensional structural diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0036] The plastic masterbatch targeted in the present application is a mixture of resin and pigment, and the plastic masterbatch includes organic masterbatch and inorganic masterbatch. The organic pigment in the organic masterbatch is phthalocyanine blue pigment, which is acid-resistant, and the inorganic pigment in the inorganic masterbatch is cobalt blue pigment, which is heat-resistant.

[0037] like Figure 1 As shown, a recycling process of a plastic masterbatch recycling system includes the following steps:

[0038] S1: crush, grind and clean the plastic masterbatch in sequence to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0039] S2: The plastic masterbatch is treated with potassium chromate, and the organic masterbatch and the inorganic masterbatch are distinguished according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch, and the distinguished organic masterbatch and inorganic masterbatch are sorted, and the number of the sorted organic masterbatch and inorganic masterbatch is recorded respectively. The potassium chromate treatment is to immerse the plastic masterbatch in a potassium chromate solution with a concentration of 0.5%-2% for 10-30 minutes.

[0040] The changes in chromaticity and glossiness are: the changes in chromaticity and glossiness of plastic masterbatches before and after the potassium chromate treatment unit, and the changes in chromaticity and glossiness between organic masterbatches and inorganic masterbatches after the potassium chromate treatment unit. Chromaticity and glossiness are important indicators of the surface characteristics of plastic materials. By measuring the changes in chromaticity and glossiness before and after potassium chromate treatment, organic and inorganic masterbatches can be distinguished more accurately.

[0041] S3: Purify the sorted organic masterbatch and inorganic masterbatch respectively to obtain purified organic masterbatch and inorganic masterbatch respectively, and record the quantity of purified organic masterbatch and inorganic masterbatch respectively;

[0042] S4: Compare the number of sorted organic and inorganic masterbatches in S3 with the number of purified organic and inorganic masterbatches in S4 to obtain a purification rate, and modify the accuracy of the sorting process based on the purification rate. The purification rate is the proportion of the number of purified organic and inorganic masterbatches in the number of sorted organic and inorganic masterbatches.

[0043] By recording and comparing the quantity before and after sorting and the purification rate, the sorting and purification process can be continuously optimized to improve the overall recycling efficiency. The monitoring of the purification rate provides a quantitative indicator for quality control to ensure that the recycled masterbatch meets specific quality standards.

[0044] The purification rate in S4 includes the total purification rate, the organic masterbatch purification rate and the inorganic masterbatch purification rate. The total purification rate is the proportion of the total number of organic and inorganic masterbatch after purification to the total number of organic and inorganic masterbatch after sorting. The organic masterbatch purification rate and the inorganic masterbatch purification rate are the proportions of the number before and after purification, respectively.

[0045] By subdividing the total purification rate, organic masterbatch purification rate and inorganic masterbatch purification rate, each process part in the process flow can be subdivided. A low total purification rate means that the distinction accuracy between organic masterbatch and inorganic masterbatch after potassium chromate treatment is insufficient, resulting in excessive inorganic masterbatch in the differentiated organic masterbatch and excessive organic masterbatch in the inorganic masterbatch, resulting in waste.

[0046] The breakdown of the purification rate allows for a more detailed analysis of the recycling process, allowing for a more accurate assessment of the effect of each step. Clarifying the calculation methods and results of different purification rates increases the transparency of the entire recycling process, facilitating quality control and process management.

[0047] The purification rate in S4 is maintained at 95-100%. When the purification rate is lower than 95%, the sorting accuracy is improved. By maintaining a high purification rate, product quality can be better controlled and the proportion of unqualified products can be reduced. When the total purification rate is lower than 95%, the improvement of sorting accuracy is triggered, which helps to identify and solve problems that affect purification efficiency. When the sorting accuracy is improved, the concentration and treatment time of potassium chromate treatment are increased, so that the potassium chromate treatment results between organic masterbatches and inorganic masterbatches are more obvious.

[0048] The purification process in S3 includes: organic purification process and inorganic purification process. The organic purification process is to remove the inorganic masterbatch in the organic masterbatch, and the inorganic purification process is to remove the organic masterbatch in the inorganic masterbatch.

[0049] The organic purification treatment in S3 is an acid spraying treatment, which is used to spray the organic masterbatch with acid, and then detect the change in color and glossiness of the organic masterbatch after the acid spraying, and perform secondary sorting. The acid is dilute sulfuric acid with a concentration of 1%-3%, and the acid spraying time is 30min-2h. The inorganic purification treatment in S3 is a high-temperature treatment, which heats the inorganic masterbatch at high temperature, and then detects the change in color and glossiness of the organic masterbatch after the high-temperature treatment, and performs secondary sorting. The heating temperature is 350-400℃, and the heating time is 15-20min.

[0050] To achieve the above-mentioned purpose, the second technical solution adopted by the present invention is: a plastic masterbatch recovery system, including: a pretreatment unit, a differentiation unit, a purification unit and a transportation unit.

[0051] The pretreatment unit is used to pretreatment the plastic masterbatch. The pretreatment unit includes a crushing unit, a grinding unit and a cleaning unit. The crushing unit crushes the plastic masterbatch, the grinding unit grinds the plastic masterbatch, and the cleaning unit cleans the plastic masterbatch after grinding by the grinding unit. The crushing unit can be a crusher, which can crush the plastic masterbatch to make the particle size uniform. The grinding unit is a grinder, and the cleaning unit is a cleaning machine. The crushing unit makes the plastic masterbatch into particles with uniform outer diameter size, the grinding unit grinds the surface of the plastic masterbatch to form spherical particles, and makes the glossiness of the surface of the plastic masterbatch uniform, and the cleaning unit cleans the plastic masterbatch debris in the crushing unit and the grinding unit.

[0052] The pretreatment unit processes the plastic masterbatch into particles with consistent particle size and glossiness. In the subsequent potassium chromate treatment, the chromaticity and glossiness contrast between the organic masterbatch and the inorganic masterbatch can be more obvious. The plastic masterbatch with consistent particle size and glossiness can ensure the consistency of the particles in the subsequent treatment process after the chromaticity and glossiness change, thereby improving the accuracy of the differentiation process.

[0053] The distinguishing unit is used for distinguishing plastic masterbatches, and the distinguishing unit includes: a potassium chromate treatment unit, a detection unit and a sorting unit; the potassium chromate treatment unit performs potassium chromate treatment on the plastic masterbatches, and the potassium chromate treatment is to spray potassium chromate solution onto the plastic masterbatches, and the spraying direction is vertically downward; the detection unit is used for detecting the appearance characteristics of the plastic masterbatches, and the detection unit detects the chroma and glossiness of the plastic masterbatches. The detection unit includes a computer and several cameras, and the camera collects images of the plastic masterbatches, and the computer processes the images collected by the camera to obtain the chroma and glossiness of the plastic masterbatches.

[0054] The potassium chromate treatment unit includes a loading platform and a potassium chromate solution sprayer. The loading platform is used to carry plastic masterbatches, which are laid flat on the loading platform. The potassium chromate solution sprayer is used to spray potassium chromate solution. The potassium chromate solution sprayer is arranged directly above the loading platform, and the loading platform is arranged horizontally. The potassium chromate solution sprayer is arranged directly above the loading platform to ensure that the potassium chromate solution is evenly sprayed on the plastic masterbatch, thereby improving the consistency and treatment effect of the potassium chromate treatment.

[0055] The sorting unit sorts plastic masterbatches based on the changes in chromaticity and glossiness. By analyzing the changes in chromaticity and glossiness, the process parameters of potassium chromate treatment can be optimized, such as the concentration of potassium chromate solution, spraying amount and treatment time, to improve the treatment effect.

[0056] The sorting unit includes a computer and several robotic arms. The detection unit sends the chromaticity and glossiness changes of the plastic masterbatch detected by the detection unit to the sorting unit. The computer on the sorting unit controls the robotic arms to sort according to the chromaticity and glossiness changes, and sorts the plastic masterbatch with different chromaticity and glossiness changes.

[0057] The purification unit is used to purify the plastic masterbatch after being sorted by the differentiation unit. The purification unit removes the inorganic masterbatch in the organic masterbatch and the organic masterbatch in the inorganic masterbatch.

[0058] The purification unit includes: an organic purification unit and an inorganic purification unit. The organic purification unit removes the inorganic masterbatch from the organic masterbatch, and the inorganic purification unit removes the organic masterbatch from the inorganic masterbatch. The separation design of the organic purification unit and the inorganic purification unit allows the use of different treatment methods to carry out specialized treatment for different types of masterbatches and improve the purification efficiency.

[0059] The organic purification unit includes an acid sprinkling treatment unit, which is used to spray the organic masterbatch with acid. The organic purification unit is connected to a detection unit and a sorting unit. The detection unit detects the organic masterbatch after the acid sprinkling treatment, and the sorting unit sorts the organic masterbatch after the detection. The acid sprinkling treatment unit in the organic purification unit can remove inorganic impurities in the organic masterbatch by chemical methods, which is an effective chemical separation technology.

[0060] In the acid sprinkling treatment unit, the acid sprinkling solution is sprayed onto the organic masterbatch after the differentiation treatment. The inorganic masterbatch impurities in the organic masterbatch undergo an oxidation-reduction reaction with the acid sprinkling, and the chromaticity and glossiness of the inorganic masterbatch change. The plastic masterbatch with changed chromaticity and glossiness is selected through the sorting unit.

[0061] Potassium chromate treatment helps change the chemical properties of the organic masterbatch surface, making subsequent acid treatment more effective and helping to remove stubborn inorganic impurities. Potassium chromate treatment changes the surface properties of organic masterbatch, such as hydrophilicity and hydrophobicity, which helps the acid treatment process and can promote reactions in acid treatment and improve the efficiency of cleaning or dissolving impurities. Potassium chromate helps to fix or transform chemical residues in organic masterbatch, making them easier to remove during acid treatment. Potassium chromate treatment can improve the physical properties of organic masterbatch, such as hardness and wear resistance, which is beneficial for improving the processing performance and service life of the material.

[0062] The inorganic purification unit includes a high-temperature heating unit, which is used to heat the inorganic masterbatch at high temperature. High-temperature heating can effectively remove organic impurities in the inorganic masterbatch, because organic matter will degrade and denature at high temperature, and the inorganic masterbatch is resistant to high temperature. The degradation or denaturation temperature of the inorganic masterbatch is higher than the degradation or denaturation temperature of the organic masterbatch. When the organic masterbatch degrades or denatures, it is obviously different from the inorganic masterbatch and can be recycled separately.

[0063] Potassium chromate treatment can enhance the thermal stability of inorganic materials, making them less likely to decompose or degrade at high temperatures. Potassium chromate treatment can form a protective layer on the inorganic masterbatch, allowing the inorganic masterbatch to maintain good stability during high-temperature treatment, making the distinction between organic and inorganic masterbatches at high temperatures more obvious.

[0064] Potassium chromate treatment is first used and then purification treatment is performed. Potassium chromate can play a synergistic role with the acid sprinkling treatment and the high-temperature treatment in the purification treatment, respectively, so that the distinction between organic masterbatch and inorganic masterbatch in the purification treatment is more obvious. The potassium chromate treatment can play a distinguishing role through the different reactions between organic masterbatch and inorganic masterbatch, which can enhance the ability to distinguish between organic masterbatch and inorganic masterbatch, improve the purification rate, and improve the accuracy of recovering organic masterbatch and inorganic masterbatch respectively.

[0065] The transport unit is connected to the pretreatment unit, the differentiation unit and the purification unit respectively, and transports the plastic masterbatch among the pretreatment unit, the differentiation unit and the purification unit.

[0066] The plastic masterbatch is subjected to pretreatment, differentiation and purification treatments in sequence by using a pretreatment unit, a differentiation unit, a purification unit and a transportation unit. The potassium chromate treatment in the differentiation treatment can change the gloss and chroma of organic masterbatch and inorganic masterbatch, and can accurately differentiate between organic masterbatch and inorganic masterbatch. The organic masterbatch and inorganic masterbatch can be differentiated according to the changes in gloss and chroma of the organic masterbatch and inorganic masterbatch after the potassium chromate treatment, so that the organic masterbatch and the inorganic masterbatch can be differentiated and recycled based on the difference in appearance, thereby ensuring the accuracy of the recycling process and solving the defect that the plastic masterbatch in the prior art cannot accurately recycle the organic and inorganic masterbatch separately. Embodiment 1

[0067] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0068] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a potassium chromate solution with a concentration of 0.5% for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0069] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid at a concentration of 1% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at a heating temperature of 350°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0070] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate. Embodiment 2

[0071] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0072] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a 1% potassium chromate solution for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0073] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid at a concentration of 1% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at a heating temperature of 350°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0074] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate. Embodiment 3

[0075] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0076] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a 2% potassium chromate solution for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0077] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid at a concentration of 1% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at a heating temperature of 350°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0078] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate. Embodiment 4

[0079] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0080] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a 1% potassium chromate solution for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0081] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid at a concentration of 2% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at a heating temperature of 350°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0082] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate. Embodiment 5

[0083] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0084] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a 1% potassium chromate solution for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0085] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid of 3% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at 350°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0086] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate. Embodiment 6

[0087] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0088] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a 1% potassium chromate solution for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0089] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid at a concentration of 2% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at a heating temperature of 370°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0090] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate. Embodiment 7

[0091] S1: Crush, grind and clean the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch of the same chromaticity in turn to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent;

[0092] S2: Treat the plastic masterbatch with potassium chromate. Soak the plastic masterbatch in a 1% potassium chromate solution for 30 minutes. Distinguish the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch. Preliminary sorting is performed on the distinguished phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch. The number of the phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch after preliminary sorting is recorded respectively.

[0093] S3: The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after preliminary sorting are subjected to acid spraying treatment and high temperature treatment respectively. The acid spraying treatment is to spray the phthalocyanine blue plastic masterbatch with dilute sulfuric acid at a concentration of 2% for 1 hour. The high temperature treatment is to heat the cobalt blue plastic masterbatch after preliminary sorting at a heating temperature of 400°C for 20 minutes. The phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after acid spraying treatment and high temperature treatment are subjected to secondary sorting, and the quantity of the phthalocyanine blue plastic masterbatch and cobalt blue plastic masterbatch after secondary sorting is recorded respectively;

[0094] S4: Compare the quantity of the sorted phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S3 with the quantity of the purified phthalocyanine blue plastic masterbatch and the cobalt blue plastic masterbatch in S4 to obtain a total purification rate.

[0095] The total purification rates in Examples 1 to 7 were collected, and the collection results are shown in Table 1.

[0096] Table 1 Total purification rate values ​​in Examples 1 to 7

[0097]

[0098] As can be seen from Table 1, in Examples 1 to 3, as the concentration of potassium chromate increases, the total purification rate value first increases and then decreases. This is because as the concentration of potassium chromate increases, the redox reaction between the cobalt blue plastic masterbatch and potassium chromate becomes more intense, and the chromaticity and glossiness change more significantly. However, when the concentration of potassium chromate is too high, the oxidizing ability is too strong, so that the phthalocyanine blue plastic masterbatch also undergoes a redox reaction, making the chromaticity change unclear. The preferred embodiment is Example 2.

[0099] In Example 2 and Examples 4 to 5, as the concentration of dilute sulfuric acid increases, the total purification rate value first increases and then decreases. This is because as the concentration of dilute sulfuric acid increases, the reaction rate accelerates and the color development becomes more obvious. However, the excessively high concentration of dilute sulfuric acid enhances the oxidation ability of the chromate originally on the cobalt blue plastic masterbatch, causing the phthalocyanine blue plastic masterbatch to undergo an oxidation-reduction reaction, making the chromaticity unclear. The preferred embodiment is Example 4.

[0100] In Example 4 and Examples 6 to 7, as the heating temperature increases, the total purification rate value first increases and then decreases. This is because as the heating temperature increases, the phthalocyanine blue plastic masterbatch denatures and begins to show color. However, when the temperature is too high, the resin part in the cobalt blue plastic masterbatch also denatures, making the color difference between the cobalt blue plastic masterbatch and the phthalocyanine blue plastic masterbatch not obvious. The preferred embodiment is Example 6.

[0101] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A recycling process for plastic masterbatch, characterized in that: The following steps are involved: S1: Plastic masterbatches include organic masterbatches and inorganic masterbatches of the same chromaticity. The organic pigment in the organic masterbatch is phthalocyanine blue pigment, and the inorganic pigment in the inorganic masterbatch is cobalt blue pigment. The plastic masterbatch is crushed, polished and cleaned in sequence to ensure that the outer diameter and glossiness of the plastic masterbatch are consistent; S2: treating the plastic masterbatch with potassium chromate, distinguishing the organic masterbatch from the inorganic masterbatch according to the changes in the chromaticity and glossiness of the outer surface of the plastic masterbatch, and preliminarily sorting the distinguished organic masterbatch and inorganic masterbatch, and recording the number of the organic masterbatch and inorganic masterbatch after the preliminary sorting, wherein the potassium chromate treatment is to immerse the plastic masterbatch in a potassium chromate solution with a concentration of 0.5%-2% for a soaking time of 10-30 minutes; S3: Purify the organic masterbatch and the inorganic masterbatch after preliminary sorting respectively to obtain the purified organic masterbatch and the inorganic masterbatch respectively, and record the number of the purified organic masterbatch and the inorganic masterbatch respectively, wherein the purification process includes: organic purification process and inorganic purification process, wherein the organic purification process is to remove the inorganic masterbatch in the organic masterbatch, and the organic purification process is an acid spraying process, wherein the acid spraying process is used to spray the organic masterbatch with acid liquid, and then the organic masterbatch is purified after the acid liquid is sprayed. Perform chromaticity and glossiness change detection, and perform secondary sorting, the acid solution is dilute sulfuric acid with a concentration of 1%-3%, the acid sprinkling treatment time is 30min-2h, the inorganic purification treatment removes the organic masterbatch in the inorganic masterbatch, the inorganic purification treatment is a high-temperature treatment, the inorganic masterbatch is heated at high temperature, and the chromaticity and glossiness change of the organic masterbatch is detected after the high-temperature treatment, and secondary sorting is performed, the heating temperature is 350-400℃, and the heating time is 15-20min; S4: Compare the quantity of the organic masterbatch and the inorganic masterbatch after the preliminary sorting in S3 with the quantity of the organic masterbatch and the inorganic masterbatch after the purification in S4 to obtain the purification rate, and modify the accuracy of the preliminary sorting process according to the purification rate, wherein the purification rate is the proportion of the quantity of the organic masterbatch and the inorganic masterbatch after the purification to the quantity of the organic masterbatch and the inorganic masterbatch after the preliminary sorting.

2. The recycling process of plastic masterbatch according to claim 1, characterized in that: The chromaticity and glossiness changes in S2 are: the chromaticity and glossiness changes of the plastic masterbatch before and after the potassium chromate treatment, and the chromaticity and glossiness changes between the organic masterbatch and the inorganic masterbatch after the potassium chromate treatment.

3. The recycling process of plastic masterbatch according to claim 1, characterized in that: The purification rate in S4 includes the total purification rate, the organic masterbatch purification rate and the inorganic masterbatch purification rate. The total purification rate is the proportion of the total number of organic masterbatch and inorganic masterbatch after purification to the total number of organic masterbatch and inorganic masterbatch after sorting. The organic masterbatch purification rate and the inorganic masterbatch purification rate are the proportions of the number before and after purification, respectively.

4. The recycling process of plastic masterbatch according to claim 1, characterized in that: The purification rate in S4 is maintained at 95-100%. When the purification rate is lower than 95%, the sorting accuracy is improved. The method for improving the sorting accuracy is to increase the concentration and treatment time of potassium chromate treatment.

5. A control system for a plastic masterbatch recycling process, applicable to a plastic masterbatch recycling process according to any one of claims 1 to 4, comprising: The pretreatment unit, the differentiation unit, the purification unit and the transport unit are characterized by: The pretreatment unit is used to pretreatment the plastic masterbatch, and the pretreatment unit includes a crushing unit, a grinding unit and a cleaning unit. The crushing unit crushes the plastic masterbatch, the grinding unit grinds the plastic masterbatch, and the cleaning unit cleans the plastic masterbatch after grinding by the grinding unit; The distinguishing unit is used to distinguish and process the plastic masterbatch, and the distinguishing unit includes: a potassium chromate treatment unit, a detection unit and a sorting unit; the potassium chromate treatment unit performs potassium chromate treatment on the plastic masterbatch, and the potassium chromate treatment is to spray the potassium chromate solution onto the plastic masterbatch, and the spraying direction is vertically downward; the detection unit is used to detect the appearance characteristics of the plastic masterbatch, and the detection unit detects the chroma and glossiness of the plastic masterbatch; the sorting unit sorts the plastic masterbatch based on the chroma and glossiness changes; The purification unit is used to purify the plastic masterbatch sorted by the differentiation unit, and the purification unit removes the inorganic masterbatch in the organic masterbatch and the organic masterbatch in the inorganic masterbatch respectively; The transport unit is connected to the pretreatment unit, the differentiation unit and the purification unit respectively, and transports the plastic masterbatch between the pretreatment unit, the differentiation unit and the purification unit.

6. The control system for the recycling process of plastic masterbatch according to claim 5, characterized in that: The crushing unit makes the plastic masterbatch into particles with uniform outer diameter, the polishing unit polishes the surface of the plastic masterbatch to form spherical particles and makes the glossiness of the surface of the plastic masterbatch uniform, and the cleaning unit cleans the plastic masterbatch debris in the crushing unit and the polishing unit.

7. The control system for the recycling process of plastic masterbatch according to claim 6, characterized in that: The potassium chromate treatment unit includes a loading platform and a potassium chromate solution sprayer. The loading platform is used to carry plastic masterbatches, and the plastic masterbatches are spread flat on the loading platform. The potassium chromate solution sprayer is used to spray potassium chromate solution. The potassium chromate solution sprayer is arranged directly above the loading platform, and the loading platform is arranged horizontally.

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