High-dispersity polyethylene primary color master batch and preparation method thereof

Abstract

The invention provides a high-dispersity polyethylene primary color master batch and a preparation method thereof, and relates to the field of polyethylene primary color master batches. The high-dispersity polyethylene-based primary color master batch comprises 40-60% of high-density polyethylene, 20-40% of a heat-stable pigment, 10-20% of a dispersant and 5-10% of a compatible agent. By selecting the specific heat-stable pigment and combining the efficient dispersing agent, the stability of the pigment in the high-temperature processing process and the uniform dispersity of the pigment in a polyethylene matrix are effectively improved, so that the color consistency and quality of the color master batch at high temperature are ensured; according to the technical scheme, the mechanical property of the color master batch is enhanced, so that the color master batch is more suitable for high-speed injection molding processing, and the preparation method in the scheme comprises accurate ratio control and efficient mixing and extrusion processes, and particularly adopts an ultrasonic mixing technology and a double-screw extruder.

Description

Technical Field

[0001] The present invention relates to the technical field of polyethylene-based masterbatches, and specifically to a highly dispersible polyethylene-based masterbatch and a preparation method thereof. Background Art

[0002] A highly dispersible polyethylene-based masterbatch is a colorant used in the plastic processing industry. A masterbatch is a concentrate in which pigments or dyes are uniformly dispersed in a carrier resin, and it is used to color plastic products. The following is some detailed introduction to the highly dispersible polyethylene-based masterbatch: In this masterbatch, the carrier is usually high-density polyethylene (HDPE). HDPE is a thermoplastic polymer, well-known for its good chemical stability, high strength, and wear resistance. A key characteristic of the masterbatch is the uniformity of pigment dispersion. High dispersibility ensures that the pigments are evenly distributed throughout the polymer matrix, thereby providing a uniform color and covering power. This is crucial for ensuring that the final product has a consistent appearance and quality. Various types of pigments and dyes can be used in the masterbatch. These pigments may be organic, inorganic, or special effect pigments such as pearlescent or fluorescent pigments. The highly dispersible HDPE-based masterbatches are widely used in the coloring of plastic products, including packaging materials, toys, containers, pipes, and many other consumer goods. The masterbatch is used in the plastic processing process. By extrusion, blow molding, injection molding, or other molding processes, the masterbatch is mixed with the base resin to produce colored plastic products. Using masterbatches for coloring is easier to control the dispersion and concentration of colors compared to directly using pigment powders, while reducing dust and health risks during the operation process. When selecting masterbatches, their environmental impact and potential risks to health need to be considered.

[0003] However, during the processing, high temperatures may affect the stability of some pigments, resulting in color changes or degradation. Although the purpose of the masterbatch is to achieve uniform dispersion, some pigments are difficult to be uniformly dispersed in the polyethylene matrix. This may lead to uneven color distribution, affecting the quality and appearance of the final product. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a highly dispersible polyethylene-based masterbatch and a preparation method thereof, solving the problems of thermal stability and difficult pigment dispersion. Technical Solution

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A highly dispersible polyethylene-based masterbatch, comprising: 40 - 60% high-density polyethylene, 20 - 40% heat-stable pigment, 10 - 20% dispersant, and 5 - 10% compatibilizer. The heat-stable pigment is an organic pigment with excellent stability at high temperatures to improve color stability during processing. The dispersant is used to optimize the dispersion ability of the pigment in the high-density polyethylene matrix to ensure uniform pigment distribution. The preparation process of the masterbatch undergoes strict temperature control to prevent pigment thermal degradation. At the same time, through selected components, the color consistency and quality of the final product are ensured. The masterbatch not only exhibits excellent stability at high temperatures but also shows low-risk characteristics in terms of environmental impact and health risks, making it suitable for coloring various plastic products such as packaging materials, household items, and industrial components; Preferably, the heat-stable pigment is a pigment with high UV resistance of Clariant's Hostavin®, the dispersant is the non-ionic surfactant BYK-333 of BYK, and the dispersant accounts for 3% of the pigment weight.

[0006] Preferably, the compatibilizer includes the performance polymer Vistamaxx™ of ExxonMobil. The density of the high-density polyethylene is 0.960 g / cm³ to provide additional mechanical properties. The particle size range of the pigment is 2 - 5 microns to optimize color uniformity. The masterbatch has a flowability suitable for high-speed injection molding processing.

[0007] A method for preparing a highly dispersible polyethylene-based masterbatch, comprising the following steps: S1. Select a heat-stable pigment with high temperature resistance, and mix the pigment with a dispersant and polyethylene wax in a ratio of 1:0.05 to optimize the dispersion of the pigment; S2. Dry the premix in a constant-temperature drying oven at 45°C for 12 hours to remove moisture and solvents; S3. Mix the dried premix with high-density polyethylene and a compatibilizer in a weight ratio of 2 - 3:1:0.1; S4. Uniformly mix the mixture in a high-shear mixer for 30 minutes to ensure uniform dispersion of the pigment and additives in the high-density polyethylene; S5. Extrude in a twin-screw extruder under temperature control at 230°C to achieve uniform fusion of the pigment and HDPE while preventing thermal degradation; S6. Cool the extrudate using a water cooling system, then cut the extrudate into pellets by an automatic cutting machine, and perform secondary drying on the obtained pellets at 50°C for 6 hours to ensure complete removal of moisture; S7. Screen the pellets using a mechanical vibrating screen to remove pellets with sizes outside the specified range to ensure the uniformity of the product. In a dust-free and low-humidity environment, package the masterbatch in a moisture-proof and light-proof packaging material to ensure its stability during transportation and storage.

[0008] Preferably, an ultraviolet absorber is added during the extrusion process to improve the weather resistance of the masterbatch. The starting temperature of the extrusion is 220°C and the final temperature is 240°C.

[0009] Preferably, the mixing of the pigment and the dispersant is carried out by ultrasonic mixing to enhance the dispersion effect. The cooling step adopts a step-by-step cooling method to prevent internal stress generated by the rapid cooling of the particles.

[0010] Preferably, the secondary drying step is carried out in a vacuum environment to improve the drying efficiency. The screening step adopts an automated particle size sorting system to ensure higher particle size consistency.

[0011] Preferably, the packaging step includes using antistatic materials for packaging to prevent aggregation between the particles. The cutting step of the extrudate uses laser cutting technology to improve the cutting accuracy and particle uniformity. Beneficial effects

[0012] The present invention provides a highly dispersible polyethylene-based masterbatch and a preparation method thereof. The following beneficial effects are achieved: By selecting specific heat-stable pigments and combining with highly efficient dispersants, this solution effectively improves the stability of the pigments during high-temperature processing and their uniform dispersion in the polyethylene matrix, which ensures the color consistency and quality of the masterbatch at high temperatures. Using high-density polyethylene with a specific density and a compatible polymer as a compatibilizer, this technical solution enhances the mechanical properties of the masterbatch, making it more suitable for high-speed injection molding processing. The preparation method in this solution includes precise ratio control, efficient mixing, and extrusion processes, especially the use of ultrasonic mixing technology and a twin-screw extruder. These steps significantly improve the dispersion efficiency of the pigments and the overall quality of the masterbatch. Adding an ultraviolet absorber during the extrusion process and precise control of the extrusion temperature not only protect the pigments from thermal degradation but also enhance the weather resistance of the masterbatch. Specific embodiments

[0013] The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0014] An embodiment of the present invention provides a highly dispersible polyethylene-based masterbatch, comprising 45% high-density polyethylene, 30% heat-stable pigment, 10 - 20% dispersant, and 5 - 10% compatibilizer. The heat-stable pigment is an organic pigment with excellent stability at high temperatures to improve color stability during processing. The dispersant is used to optimize the dispersion ability of the pigment in the high-density polyethylene matrix to ensure uniform distribution of the pigment. The preparation process of the masterbatch undergoes strict temperature control to prevent thermal degradation of the pigment. At the same time, through selected components, the color consistency and quality of the final product are ensured. The masterbatch not only exhibits excellent stability at high temperatures but also shows low-risk characteristics in terms of environmental impact and health risks, making it suitable for coloring various plastic products such as packaging materials, household items, and industrial components. The heat-stable pigment is a pigment with high UV resistance of Clariant's Hostavin®. The dispersant is a non-ionic surfactant BYK-333 of BYK, and the dispersant accounts for 3% of the weight of the pigment. The compatibilizer includes a performance polymer Vistamaxx™ of ExxonMobil. The density of the high-density polyethylene is 0.960 g / cm³ to provide additional mechanical properties. The particle size range of the pigment is 2 - 5 microns to optimize color uniformity. The masterbatch has a fluidity suitable for high-speed injection molding processing.

[0015] A method for preparing a highly dispersible polyethylene-based masterbatch includes the following steps: S1. Select a heat-stable pigment with high temperature resistance, and mix the pigment with a dispersant and polyethylene wax in a ratio of 1:0.05 to optimize the dispersibility of the pigment.

[0016] S2. Dry the premix in a constant-temperature drying oven at 45°C for 12 hours to remove moisture and solvents.

[0017] S3. Mix the dried premix with high-density polyethylene and a compatibilizer in a weight ratio of 2:1:0.1.

[0018] S4. Uniformly mix the mixture in a high-shear mixer for 30 minutes to ensure uniform dispersion of the pigment and additives in the high-density polyethylene. The mixing of the pigment and the dispersant uses ultrasonic mixing to enhance the dispersion effect. The cooling step adopts a step-by-step cooling method to prevent internal stress from being generated in the particles due to rapid cooling.

[0019] S5. Extrude at a temperature control of 230°C in a twin-screw extruder to achieve uniform fusion of the pigment and HDPE, while preventing thermal degradation. Add an ultraviolet absorber during the extrusion process to improve the weather resistance of the masterbatch. The extrusion temperature is 220°C at the starting stage and 240°C at the final stage.

[0020] S6. Use a water cooling system to cool the extrudate, then cut the extrudate into pellets by an automatic cutting machine, and perform secondary drying on the obtained pellets at 50 °C for 6 hours to ensure complete removal of moisture. The secondary drying step is carried out in a vacuum environment to improve the drying efficiency. The screening step uses an automated particle size sorting system to ensure higher particle size consistency.

[0021] S7. Screen the pellets using a mechanical vibrating sieve to remove pellets with sizes outside the specified range and ensure the uniformity of the product. In a dust-free and low-humidity environment, package the masterbatch in moisture-proof and light-proof packaging materials to ensure its stability during transportation and storage. The packaging step includes using antistatic materials for packaging to prevent aggregation between pellets. The cutting step of the extrudate uses laser cutting technology to improve cutting accuracy and particle uniformity. Examples

[0022] An embodiment of the present invention provides a highly dispersible polyethylene-based masterbatch, including 60% high-density polyethylene, 20% heat-stable pigment, 10 - 20% dispersant, and 5 - 10% compatibilizer. The heat-stable pigment is an organic pigment with excellent stability at high temperatures to improve color stability during the processing. The dispersant is used to optimize the dispersion ability of the pigment in the high-density polyethylene matrix to ensure uniform distribution of the pigment. The preparation process of the masterbatch undergoes strict temperature control to prevent thermal degradation of the pigment. At the same time, through selected components, the color consistency and quality of the final product are ensured. The masterbatch not only exhibits excellent stability at high temperatures but also shows low-risk characteristics in terms of environmental impact and health risks, making it suitable for coloring various plastic products such as packaging materials, household items, and industrial components. The heat-stable pigment is a pigment with high UV resistance of Clariant's Hostavin®. The dispersant is a non-ionic surfactant BYK-333 of BYK, and the dispersant accounts for 3% of the weight of the pigment. The compatibilizer includes a performance polymer Vistamaxx™ of ExxonMobil. The density of the high-density polyethylene is 0.960 g / cm³ to provide additional mechanical properties. The particle size range of the pigment is 2 - 5 microns to optimize color uniformity. The masterbatch has a fluidity suitable for high-speed injection molding processing.

[0023] A method for preparing a highly dispersible polyethylene-based masterbatch includes the following steps: S1. Select a heat-stable pigment with high temperature resistance, and mix the pigment with a dispersant and polyethylene wax in a ratio of 1:0.05 to optimize the dispersion of the pigment.

[0024] S2. Dry the premix in a constant-temperature drying oven at 45 °C for 12 hours to remove moisture and solvents.

[0025] S3. Mix the dried premix with high-density polyethylene and a compatibilizer in a weight ratio of 3:1:0.1.

[0026] S4. Uniformly mix the mixture in a high-shear mixer for 30 minutes to ensure that the pigments and additives are uniformly dispersed in the high-density polyethylene. Ultrasonic mixing is used for the mixing of the pigments and the dispersant to enhance the dispersion effect. The cooling step adopts a step-by-step temperature reduction method to prevent internal stress generated by the rapid cooling of the particles.

[0027] S5. Extrude at a temperature of 230 °C in a twin-screw extruder to achieve uniform fusion of the pigments and HDPE while preventing thermal degradation. An ultraviolet absorber is added during the extrusion process to improve the weather resistance of the masterbatch. The extrusion temperature is 220 °C at the initial stage and 240 °C at the final stage.

[0028] S6. Cool the extrudate using a water cooling system, then cut the extrudate into pellets by an automatic cutting machine. The obtained pellets are secondarily dried at 50 °C for 6 hours to ensure complete removal of moisture. The secondary drying step is carried out in a vacuum environment to improve the drying efficiency. The screening step uses an automated particle size sorting system to ensure higher particle size consistency.

[0029] S7. Screen the pellets using a mechanical vibrating sieve to remove the pellets with sizes outside the specified range and ensure the uniformity of the product. In a dust-free and low-humidity environment, the masterbatch is packaged in moisture-proof and light-proof packaging materials to ensure its stability during transportation and storage. The packaging step includes using antistatic materials for packaging to prevent aggregation between the particles. The cutting step of the extrudate uses laser cutting technology to improve the cutting accuracy and particle uniformity.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly dispersed polyethylene-based masterbatch, characterized in that, Comprising: 40 - 60% high-density polyethylene, 20 - 40% heat-stable pigment, 10 - 20% dispersant, and 5 - 10% compatibilizer.

2. The high-dispersion polyethylene-based masterbatch according to claim 1, characterized in that: The heat-stable pigment is a Hostavin® pigment with high UV resistance from Clariant, the dispersant is the BYK-333 non-ionic surfactant from BYK, and the dispersant accounts for 3% of the pigment weight.

3. The high-dispersion polyethylene-based masterbatch according to claim 1, wherein: The compatibilizer includes a Vistamaxx™ performance polymer from ExxonMobil, the high-density polyethylene has a density of 0.960 g / cm³ to provide additional mechanical properties, the particle size range of the pigment is 2 - 5 microns to optimize color uniformity, and the masterbatch has a flowability suitable for high-speed injection molding.

4. A preparation method of a highly dispersed polyethylene-based masterbatch, characterized in that, Including the following steps: S1. Select a heat-stable pigment with high temperature resistance, and mix the pigment with the dispersant and polyethylene wax in a ratio of 1:0.05 to optimize the dispersion of the pigment. S2. Dry the premix in a constant-temperature drying oven at 45°C for 12 hours to remove moisture and solvents. S3. Mix the dried premix with high-density polyethylene and compatibilizer in a weight ratio of 2 - 3:1:0.

1. S4. Uniformly mix the mixture in a high-shear mixer for 30 minutes to ensure uniform dispersion of the pigment and additives in the high-density polyethylene. S5. Extrude at a temperature of 230°C in a twin-screw extruder to achieve uniform fusion of the pigment and HDPE while preventing thermal degradation. S6. Cool the extrudate using a water cooling system, then cut the extrudate into pellets by an automatic cutting machine, and perform secondary drying on the obtained pellets at 50°C for 6 hours to ensure complete removal of moisture. S7. Screen the pellets using a mechanical vibrating screen to remove pellets with sizes outside the specified range to ensure product uniformity. In a dust-free and low-humidity environment, pack the masterbatch in moisture-proof and light-proof packaging materials to ensure its stability during transportation and storage.

5. The preparation method of a highly dispersed polyethylene-based color masterbatch according to claim 4, characterized in that: An ultraviolet absorber is added during the extrusion process to improve the weather resistance of the masterbatch, and the extrusion temperature is 220°C at the starting stage and 240°C at the final stage.

6. The preparation method of a highly dispersed polyethylene-based masterbatch according to claim 4, characterized in that: The mixing of the pigment and the dispersant uses ultrasonic mixing to enhance the dispersion effect, and the cooling step uses a stepwise cooling method to prevent internal stress generation in the pellets due to rapid cooling.

7. A method for preparing a highly dispersed polyethylene-based masterbatch according to claim 4, characterized in that: The secondary drying step is carried out in a vacuum environment to improve the drying efficiency, and the screening step uses an automated particle size sorting system to ensure higher particle size consistency.

8. A method for preparing a highly dispersed polyethylene-based masterbatch according to claim 4, characterized in that: The packaging step includes using antistatic materials for packaging to prevent aggregation between the pellets, and the cutting step of the extrudate uses laser cutting technology to improve cutting accuracy and pellet uniformity.