Defoaming master batch preparation method and system based on self-repairing material

Abstract

The invention relates to the technical field of polymer preparation, in particular to a defoaming master batch preparation method and system based on a self-repairing material. The method comprises the following steps: obtaining a mixing ratio of a polypropylene defoaming master batch formula, weighing a certain amount of a polyether defoaming agent and a self-repairing material, fully mixing and stirring, adding polypropylene and an auxiliary agent, continuously stirring, and standing to generate a defoaming self-repairing viscous uniform mixture; feeding the defoaming self-repairing viscous and uniform mixture into a double-screw extruder for melt blending and extrusion granulation to generate a polypropylene defoaming self-repairing master batch finished product; adding the polypropylene defoaming self-repairing master batch finished product into a polypropylene processing process to carry out defoaming test evaluation measurement and defoaming efficiency quantitative calculation to obtain a polypropylene defoaming master batch defoaming efficiency measurement value; and carrying out defoaming quality detection on the finished product of the polypropylene defoaming self-repairing master batch to generate the polypropylene defoaming self-repairing stable master batch. The defoaming master batch provided by the invention is stable and has a self-repairing function.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer preparation, and in particular to a method and system for preparing a defoaming masterbatch based on a self-repairing material. Background Art

[0002] In the fields of plastic processing, coatings, rubber and chemicals, the generation of foam not only affects production efficiency, but also leads to reduced product quality, processing difficulties and energy waste. At the same time, in recent years, the research on defoamers based on self-healing materials has gradually emerged. Self-healing materials have the characteristics of being able to self-repair after being damaged, and can maintain a long-lasting defoaming effect during the defoaming process and extend the service life of the defoamer. For example, some polymers with self-healing functions can restore their structure through chemical reactions or physical actions after being stressed, thereby effectively extending the duration of their defoaming function. However, the common defoamers on the market currently mainly include silicon-based defoamers, organic defoamers, inorganic defoamers, etc. Although these defoamers can effectively inhibit the formation of foam or accelerate the rupture of foam when used, their defoaming effects tend to gradually decrease under long-term or high-temperature and high-pressure environments, resulting in frequent replenishment and replacement of defoamers. Summary of the invention

[0003] Based on this, it is necessary for the present invention to provide a method and system for preparing a defoaming masterbatch based on a self-repairing material to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above object, a method for preparing a defoaming masterbatch based on a self-repairing material comprises the following steps:

[0005] Step S1: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, weighing a certain amount of polyether defoaming agent and self-repairing material and fully mixing and stirring them with a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; adding polypropylene and additives to the preliminary defoaming self-repairing mixture, continuing to stir and standing to generate a defoaming self-repairing viscous and uniform mixture;

[0006] Step S2: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjusting the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800 μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product;

[0007] Step S3: adding the finished polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch;

[0008] Step S4: Based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch, the corresponding polypropylene defoaming self-repairing masterbatch finished product is tested for defoaming quality to generate a polypropylene defoaming self-repairing stable masterbatch.

[0009] Further, step S1 includes the following steps:

[0010] Step S11: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula;

[0011] Step S12: weighing a certain amount of 20g of polyether defoamer and 15g of self-healing material according to the mixing ratio of the polypropylene defoaming masterbatch formula with 100g as the standard, and adding 20g of the polyether defoamer and 15g of the self-healing material into a high-speed mixing device;

[0012] Step S13: using a high-speed mixing device set at a temperature of 35°C-45°C, a relative humidity of 30%-40% and a mixing environment between 1.1 times and 1.3 times the standard atmospheric pressure, 20g of the polyether defoamer and 15g of the self-healing material are fully mixed and stirred, and the stirring operation is performed in stages at a low speed of 500-800r / min for 3-5min, a medium speed of 1200-1500r / min for 5-8min, and a high speed of 2000-2500r / min for 3-5min, so as to generate a preliminary defoaming self-healing mixture;

[0013] Step S14: adding 55 g of polypropylene and 5 g of an auxiliary agent to the preliminary defoaming self-repairing mixture and continuing to perform densification and uniform stirring in a gradient temperature and pressure manner to generate a defoaming self-repairing densified uniform mixture;

[0014] Step S15: placing the defoaming self-repairing densified uniform mixture in an environment of 15° C.-20° C. and leaving it to stand for 20-30 minutes to generate a defoaming self-repairing viscous uniform mixture.

[0015] Furthermore, the mixing ratio of the polypropylene defoaming masterbatch formula described in step S11 is specifically 10%-30% polyether defoaming agent, 10%-20% self-repairing material, 40%-60% polypropylene and 1%-5% additive.

[0016] Furthermore, the self-healing material is specifically an epoxy resin with dynamic covalent bonds or a polyurethane and polyester with a reversible cross-linking structure.

[0017] Furthermore, the 5 g of auxiliary agent in step S14 is specifically 1 g of dispersant, 3 g of antioxidant and 1 g of plasticizer.

[0018] Furthermore, the gradient temperature pressing method described in step S14 is specifically:

[0019] In the initial stage, the temperature was set to 30°C-40°C, the pressure was set to 0.5MPa and the duration was set to 10min for stirring;

[0020] In the intermediate stage, the temperature was set to 40°C-60°C, the pressure was set to 1.2 MPa and the duration was set to 15 min for stirring;

[0021] In the final stage, the temperature was set to 60°C-80°C, the pressure was set to 2.0 MPa and the duration was 8 minutes for stirring.

[0022] Further, step S2 includes the following steps:

[0023] Step S21: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder, adjusting the temperature of the twin-screw extruder at the feeding stage to 150°C-170°C, the rotation speed to 80-120r / min and the pressure to 2-4MPa for initial feeding and smooth advancement, and then entering the melting stage after 3-5 minutes;

[0024] Step S22: melt-blending the defoaming self-repairing viscous uniform mixture by adjusting the corresponding temperature to 180° C.-200° C., the rotation speed to 200-250 r / min and the pressure to 6-8 MPa using a twin-screw extruder in the melting stage to generate a polypropylene defoaming self-repairing molten mixture;

[0025] Step S23: When the polypropylene defoaming self-repairing molten mixture approaches the corresponding die of the twin-screw extruder, the temperature of the twin-screw extruder is adjusted to 200° C.-250° C., the speed is 150-200 r / min, and the pressure is 8-10 MPa, and the polypropylene defoaming self-repairing molten mixture is extruded to obtain a polypropylene defoaming self-repairing masterbatch raw material;

[0026] Step S24: The polypropylene defoaming self-repairing masterbatch raw material is quickly cooled by a cooling system, and the cooled polypropylene defoaming self-repairing masterbatch raw material is pelletized and formed, and the particle size of the defoaming masterbatch is controlled to be between 100-800 μm to generate a polypropylene defoaming self-repairing masterbatch finished product.

[0027] Further, step S3 includes the following steps:

[0028] Step S31: 1-3% of the finished polypropylene defoaming self-repairing masterbatch is weighed by an electronic balance and added to the defoaming test device and the polypropylene substrate in the polypropylene processing process for defoaming test treatment, so as to adjust the control temperature range to 190°C-230°C and the rotation speed to 50-150r / min to generate the defoaming test process of the polypropylene defoaming self-repairing masterbatch;

[0029] Step S32: performing defoaming evaluation measurement on the defoaming test process of the polypropylene defoaming self-repairing masterbatch to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch;

[0030] Step S33: Based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated using the polypropylene defoaming efficiency measurement calculation formula to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch.

[0031] Furthermore, the polypropylene defoaming efficiency measurement calculation formula in step S33 is specifically:

[0032]

[0033] In the formula, E s is the defoaming efficiency measure of polypropylene defoaming masterbatch, T s is the defoaming time of polypropylene defoaming masterbatch, t is the time node of the defoaming process, H(t) is the foam height of polypropylene defoaming masterbatch at the time node t, is the foam height change rate, exp is the exponential function, α is the defoaming height exponential attenuation factor, and η is the correction coefficient of the defoaming efficiency measurement value of polypropylene defoaming masterbatch.

[0034] Furthermore, the present invention also provides a defoaming masterbatch preparation system based on a self-repairing material, which is used to perform the defoaming masterbatch preparation method based on a self-repairing material as described above. The defoaming masterbatch preparation system based on a self-repairing material comprises:

[0035] The defoaming masterbatch mixture uniform stirring module is used to obtain the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, a certain amount of polyether defoaming agent and self-repairing material are weighed and fully mixed and stirred using a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; polypropylene and additives are added to the preliminary defoaming self-repairing mixture, and the mixture is continuously stirred and allowed to stand, thereby generating a defoaming self-repairing viscous uniform mixture;

[0036] The defoaming masterbatch melt blending extrusion preparation module is used to feed the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjust the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product;

[0037] The defoaming efficiency evaluation module of the finished product of defoaming masterbatch is used to add the finished product of polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement, so as to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch;

[0038] The defoaming masterbatch finished product quality detection module is used to perform defoaming quality detection on the corresponding polypropylene defoaming self-repairing masterbatch finished product based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch to generate a polypropylene defoaming self-repairing stable masterbatch.

[0039] Beneficial effects of the present invention:

[0040] 1. The method for preparing defoaming masterbatch based on self-repairing material proposed in the present invention has the beneficial effect of obtaining the mixing ratio of the polypropylene defoaming masterbatch formula. The main purpose of this step is to ensure the accurate ratio of each component in the final formula and ensure the stable performance of the product. The reasonable formula ratio can optimize the effect of the defoaming agent and ensure that the polypropylene defoaming masterbatch will not produce too many bubbles during the processing, while avoiding excessive use of the defoaming agent and affecting other properties of the final product, thereby improving the preparation and production efficiency of the defoaming masterbatch. Based on the mixing ratio of the polypropylene defoaming masterbatch formula, a certain amount of polyether defoaming agent and self-repairing material are weighed and fully mixed and stirred using a high-speed mixing device. The key to this operation is the precise weighing and distribution of the materials to ensure that the quality of each component is accurate. The addition of polyether defoaming agent helps to eliminate bubbles in the polypropylene processing process, while the addition of self-repairing material can improve the durability and long-term stability of the final product. Through the staged full stirring operation, the preliminary mixture can be fully stirred at different speeds to ensure the uniform distribution of the material. At the same time, by adding polypropylene and additives to the preliminary defoaming self-repairing mixture and continuing to stir and let it stand, this step can promote the good fusion of polypropylene and other ingredients, and through gradient temperature and pressure control, ensure the optimization of the dissolution and dispersion effect of polypropylene. The addition of additives can further improve the processing performance of the mixture and the physical and chemical properties of the final product, such as improving antioxidant properties, thermal stability and wear resistance. By standing, the bubbles in the material will be gradually released to avoid bubble problems in subsequent processing, and at the same time help to better activate the self-repair mechanism of the internal structure of the material. This standing process is crucial to improving the processing stability, defoaming effect and durability of the product. Secondly, the fully mixed defoaming self-repairing viscous uniform mixture is sent to a twin-screw extruder for melt blending and extrusion. The key role of this step is to thoroughly integrate the different components physically and chemically, while ensuring that the particle size meets the requirements. The twin-screw extruder has a high material mixing capacity and temperature control accuracy, which can ensure full melting and blending at high temperature, so that the reaction and action between the components are more uniform and sufficient. In this process, by adjusting the temperature, speed and pressure, the masterbatch particle size is controlled between 100-800μm. The appropriate particle size range is not only conducive to improving the defoaming efficiency, but also ensures that the masterbatch has good dispersibility and fluidity in subsequent processing, thereby avoiding excessive bonding or uneven distribution during processing. In addition, the temperature, speed and pressure control during the extrusion process can also promote the good combination of polypropylene with defoaming agents and self-repairing materials, so that the final product has better stability and performance. Through this process, the quality of polypropylene defoaming self-repairing masterbatch has been significantly improved, making it have higher defoaming efficiency and better mechanical properties, thereby avoiding frequent replenishment and replacement of defoaming agents.Then, by adding the finished polypropylene defoaming self-repairing masterbatch into the polypropylene processing process for defoaming test evaluation and measurement, the test results can be quantitatively analyzed. The defoaming evaluation usually includes two key indicators: defoaming time and foam height. The defoaming time refers to the time required from foam generation to complete elimination, which can reflect the defoaming efficiency of the masterbatch in practical applications. The foam height refers to the maximum height of the foam during the defoaming test, which can characterize the defoaming strength and foam control ability of the defoaming masterbatch. These two indicators help to comprehensively evaluate the performance of polypropylene defoaming masterbatch and ensure the quality stability of the defoaming masterbatch. The defoaming efficiency of the polypropylene defoaming self-repairing masterbatch is further calculated by quantitatively calculating the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch. It can not only quantify the performance of the defoaming masterbatch, but also provide a theoretical basis for subsequent production. By combining the two key indicators of defoaming time and foam height, the evaluation of the defoaming efficiency is more comprehensive and scientific, and a comprehensive defoaming efficiency measurement value can be obtained. This value can directly reflect the defoaming performance of the polypropylene defoaming masterbatch, thereby helping producers to choose the most suitable defoaming masterbatch formula, helping R&D personnel to understand whether the defoaming effect of the prepared defoaming masterbatch meets the target requirements, and guiding them to carry out subsequent optimization and improvement. Finally, by conducting defoaming quality inspection on the corresponding polypropylene defoaming self-repairing masterbatch products based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch, the defoaming performance and stability of the masterbatch can be comprehensively evaluated. The defoaming efficiency measurement value is a comprehensive performance of the defoaming effect, which can provide a quantitative basis for the quality control of the masterbatch. By analyzing these data, it can be determined whether the masterbatch meets the quality standards and whether it has long-term and stable defoaming performance. It can help the R&D team to promptly discover potential quality problems, such as the decrease in the activity of the defoaming agent or the failure of the self-repairing material, so as to adjust the production process, optimize the formula, and ensure the high performance of the final product.

[0041] 2. The defoaming masterbatch preparation system based on self-healing materials proposed in the present invention is generally composed of a defoaming masterbatch mixture uniform stirring module, a defoaming masterbatch melt blending and extrusion preparation module, a defoaming masterbatch finished product defoaming efficiency evaluation module and a defoaming masterbatch finished product quality inspection module. It can realize any defoaming masterbatch preparation method based on self-healing materials described in the present invention, and is used to combine the operations between computer programs running on each module to realize the defoaming masterbatch preparation method based on self-healing materials. The internal structures of the system cooperate with each other, which can greatly reduce repetitive work and manpower investment, and can quickly and effectively provide a more accurate and efficient defoaming masterbatch preparation process based on self-healing materials, thereby simplifying the operation flow of the defoaming masterbatch preparation system based on self-healing materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments thereof made with reference to the following drawings:

[0043] Figure 1 It is a schematic flow chart of the steps of the method for preparing defoaming masterbatch based on self-repairing material of the present invention;

[0044] Figure 2 for Figure 1 Detailed step flow diagram of step S1;

[0045] Figure 3 for Figure 1 Detailed step flow diagram of step S2;

[0046] Figure 4 It is a schematic diagram of the mixing ratio of the polypropylene defoaming masterbatch formula of the present invention. DETAILED DESCRIPTION

[0047] The technical method of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In addition, the accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. The functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor methods and / or microcontroller methods.

[0049] It should be understood that, although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another unit. For example, without departing from the scope of the exemplary embodiments, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit. The term "and / or" used herein includes any and all combinations of one or more of the listed associated items.

[0050] To achieve this, please refer to Figures 1 to 4 The present invention provides a method for preparing a defoaming masterbatch based on a self-repairing material, the method comprising the following steps:

[0051] Step S1: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, weighing a certain amount of polyether defoaming agent and self-repairing material and fully mixing and stirring them with a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; adding polypropylene and additives to the preliminary defoaming self-repairing mixture, continuing to stir and standing to generate a defoaming self-repairing viscous and uniform mixture;

[0052] Step S2: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjusting the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800 μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product;

[0053] Step S3: adding the finished polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch;

[0054] Step S4: Based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch, the corresponding polypropylene defoaming self-repairing masterbatch finished product is tested for defoaming quality to generate a polypropylene defoaming self-repairing stable masterbatch.

[0055] In the embodiment of the present invention, please refer to Figure 1 As shown, it is a schematic flow chart of the steps of the method for preparing a defoaming masterbatch based on a self-repairing material of the present invention. In this example, the method for preparing a defoaming masterbatch based on a self-repairing material comprises the following steps:

[0056] Step S1: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, weighing a certain amount of polyether defoaming agent and self-repairing material and fully mixing and stirring them with a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; adding polypropylene and additives to the preliminary defoaming self-repairing mixture, continuing to stir and standing to generate a defoaming self-repairing viscous and uniform mixture;

[0057] In an embodiment of the present invention, appropriate raw materials and proportions are selected based on the physical properties of the raw materials of the polypropylene defoaming masterbatch, the requirements for the defoaming effect and the performance of the final product. The determined proportion can ensure the optimal balance between the defoaming performance and the self-repairing ability, thereby obtaining the mixing ratio of the polypropylene defoaming masterbatch formula, specifically 10%-30% polyether defoaming agent, 10%-20% self-repairing material, 40%-60% polypropylene and 1%-5% additives. After the mixing ratio of the polypropylene defoaming masterbatch formula is determined, a specific amount (20-60 parts, etc.) of each raw material is weighed according to the mixing ratio of the polypropylene defoaming masterbatch formula and with 100g as the standard. 20g of polyether defoaming agent and 15g of self-healing material are weighed for each part. An electronic precision balance is used to ensure the accuracy of the weighing. After the weighing is completed, 20g of polyether defoaming agent and 15g of self-healing material are added to the silo of the high-speed mixing equipment respectively. The high-speed mixing equipment should have a high speed and heating function so that a uniform and sufficient stirring effect can be achieved in the subsequent mixing process. After the weighed polyether defoaming agent and self-healing material are put into the high-speed mixing equipment, the equipment temperature is set to 35°C-45°C and the relative humidity is 30% -40%, and set the ambient air pressure to between 1.1 and 1.3 times the standard atmospheric pressure. Under this condition, use a staged stirring method to mix. First, set the speed of the mixing equipment to 500-800r / min, and continue stirring for 3-5 minutes. Perform preliminary stirring at a low speed to allow the two raw materials to initially blend. Then adjust the equipment to a medium speed of 1200-1500r / min, and continue stirring for 5-8 minutes to make the mixing of the raw materials more uniform. Increase the speed to 2000-2500r / min and maintain for 3-5 minutes. Perform final uniform stirring at a high speed to ensure that the polyether defoamer and the self-healing material are completely mixed, thereby generating a preliminary defoaming self-healing mixture.At the same time, after the preliminary mixture is completed, 55g of polypropylene and 5g of auxiliary agent are added, and the densification and uniform stirring are continued by gradient temperature and pressure. The purpose of this step is to improve the hardness and stability of the masterbatch by adding polypropylene. At the same time, the addition of auxiliary agent can improve the fluidity and processing performance of the final product. The 5g auxiliary agent is specifically 1g of dispersant, 3g of antioxidant and 1g of plasticizer. Then, the mixture is uniformly stirred by gradient temperature and pressure. First, in the initial stage, the temperature is set to 30℃-40℃, the pressure is set to 0.5MPa and the duration is 10min for stirring. Secondly, in the intermediate stage, the temperature is set to 40℃-60℃, the pressure is set to 1.2MPa and the duration is 15min for stirring. In the final stage, the temperature is set to 60℃-80℃, the pressure is 2.0MPa and the stirring duration is 8min, so that the polypropylene and the additives can be evenly distributed in the entire mixture, and the temperature of the mixture is ensured not to exceed the decomposition temperature of the polypropylene. Then, the mixture after densification and uniform stirring is taken out and placed in a static environment at 15℃-20℃ for 20-30 minutes. The purpose of this step is to allow the mixture to cool to room temperature and complete the final solidification during the static process. At this stage, the static environment temperature should be kept constant and without interference to avoid the influence of external factors on the quality of the mixture. During the static period, the viscosity of the mixture gradually increases to form a uniform mixture with viscous properties, and finally a defoaming self-repairing viscous uniform mixture is generated.

[0058] Step S2: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjusting the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800 μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product;

[0059] In an embodiment of the present invention, a pre-prepared defoaming self-repairing viscous uniform mixture is fed into the feed port of a twin-screw extruder. The feed section temperature range of the twin-screw extruder is first set to 150°C-170°C to ensure that the raw materials can flow smoothly into the extruder at an appropriate temperature and maintain their viscosity. The screw speed is then adjusted to 80-120r / min, and the extruder pressure is appropriately adjusted according to the characteristics of the feed material, usually set to 2-4MPa, to ensure that the material can be stably advanced during the feeding stage. At this stage, the material is still in a relatively dense state after the initial screw push. The friction and shearing action between the screws achieve preliminary mixing and uniform dispersion of the material. This state is maintained for 3-5 minutes to ensure the uniformity of the mixture and prepare for the subsequent melting stage.After the feeding stage, the material begins to enter the melting stage. At this time, it is necessary to adjust the temperature, speed and pressure of the twin-screw extruder to achieve the melting and sufficient mixing of the material. During the specific operation, the temperature of the twin-screw extruder is adjusted to 180℃-200℃. This temperature range can effectively ensure the melting of the polypropylene substrate and the defoaming self-repairing material without excessive degradation or overheating. At the same time, adjust the speed of the extruder to 200-250r / min to ensure that the material is fully mixed by the shearing action of the screw in the molten state, further improving the uniformity of the material. , the pressure needs to be set between 6-8MPa to ensure that the material is fully subjected to the high pressure in the extruder during the melting process. At the same time, when the polypropylene defoaming self-repairing molten mixture approaches the die of the twin-screw extruder, it begins to enter the extrusion processing stage. At this stage, the temperature, speed and pressure need to be accurately adjusted to ensure the quality of the finished product and the uniformity of the material. First, the temperature of the die area is set to 200℃-250℃. The temperature in this range helps the material to achieve better fluidity before leaving the mold and avoid excessive degradation of the material due to excessive temperature. Secondly, the speed of the twin-screw extruder is adjusted. The speed is adjusted to 150-200r / min. This speed can ensure that the polypropylene defoaming self-repairing molten mixture can flow fully near the die mouth to avoid blockage or uneven flow of materials due to too low speed. The pressure in the die mouth area is set to 8-10MPa to ensure that the material has enough driving force to pass through the die during the extrusion process to form a stable material flow. The main purpose of this process is to extrude the molten mixture evenly. Then, after extrusion, it immediately enters the cooling system for rapid cooling. At this time, the cooling system uses efficient water cooling or air cooling to make the extruded material Rapidly cool down to room temperature to avoid performance degradation caused by overheating of the material. The cooled masterbatch raw materials need to be cut and shaped by a pelletizer. The cutter of the pelletizer is closely matched with the outlet of the extruder to ensure that the masterbatch can be evenly cut into the required particle size after cooling. In the pelletizing process, the pelletizing speed and the cutter gap must be accurately controlled to ensure that the particle size of the masterbatch is between 100-800μm. This particle size range helps in subsequent applications. The defoaming self-repairing masterbatch can effectively exert its characteristics and be evenly mixed with other raw materials. Through this operation, the polypropylene defoaming self-repairing masterbatch finished product is finally generated.

[0060] Step S3: adding the finished polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch;

[0061] In an embodiment of the present invention, 1-3% of the previously prepared polypropylene defoaming self-repairing masterbatch finished product is accurately weighed by using an electronic balance. The finished product needs to be evenly added to the defoaming test device in the polypropylene processing process. The test device should have the function of controlling temperature and speed. The temperature range is set between 190°C and 230°C, and the speed is set to 50 to 150r / min. After the polypropylene substrate and the masterbatch are mixed, the defoaming treatment is carried out under the environmental conditions. The purpose is to simulate the performance of the defoaming effect in the actual processing process. By setting a reasonable temperature and speed, the masterbatch is fully mixed in the polypropylene substrate and the defoaming effect is exerted. The defoaming test process of the polypropylene defoaming self-repairing masterbatch previously recorded and generated is evaluated in detail. In this process, the defoaming time and foam height are measured using an accurate foam height meter and a timing device. The defoaming time refers to the time required from the beginning of foam formation to complete elimination, and the foam height refers to the maximum height corresponding to each time point after the foam is formed, thereby generating the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch. Then, by combining the defoaming time of polypropylene defoaming masterbatch, the foam height of polypropylene defoaming masterbatch and related parameters, a suitable defoaming efficiency measurement calculation formula is formed to quantitatively calculate the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product, so as to quantify the defoaming efficiency measurement value of each different component polypropylene defoaming self-repairing masterbatch, and finally obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch.

[0062] Step S4: Based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch, the corresponding polypropylene defoaming self-repairing masterbatch finished product is tested for defoaming quality to generate a polypropylene defoaming self-repairing stable masterbatch.

[0063] In the embodiment of the present invention, the defoaming quality of the polypropylene defoaming self-repairing masterbatch is tested by combining the defoaming efficiency measurement value obtained by quantification previously. The defoaming quality test adopts equipment similar to the defoaming test, but further adds a long-term stability test. First, the polypropylene defoaming masterbatch is added to the polypropylene raw material at different concentrations (for example, 0.2%, 0.5%, and 1%), and three consecutive defoaming tests are carried out to evaluate the stability of its defoaming effect under different conditions of use. After each test, the defoaming time, foam height, and foam elimination speed are recorded. During the test, the test temperature is adjusted to The temperature (80℃ to 220℃) and humidity (30% to 60%) are used to simulate different processing environments. The final quality of the defoaming masterbatch is further confirmed based on the stability of the defoaming effect. If the defoaming efficiency is significantly reduced or the foam disappearance speed does not meet the standard requirements in the three tests, it is determined that the batch of defoaming self-repairing masterbatch does not meet the quality standards. Based on the defoaming efficiency data and its stability, a stability evaluation report of the defoaming masterbatch is generated to determine whether it is qualified and can be used in actual production (that is, when the corresponding defoaming efficiency and stability exceed the threshold), and finally the polypropylene defoaming self-repairing stable masterbatch is generated.

[0064] Further, step S1 includes the following steps:

[0065] Step S11: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula;

[0066] Step S12: weighing a certain amount of 20g of polyether defoamer and 15g of self-healing material according to the mixing ratio of the polypropylene defoaming masterbatch formula with 100g as the standard, and adding 20g of the polyether defoamer and 15g of the self-healing material into a high-speed mixing device;

[0067] Step S13: using a high-speed mixing device set at a temperature of 35°C-45°C, a relative humidity of 30%-40% and a mixing environment between 1.1 times and 1.3 times the standard atmospheric pressure, 20g of the polyether defoamer and 15g of the self-healing material are fully mixed and stirred, and the stirring operation is performed in stages at a low speed of 500-800r / min for 3-5min, a medium speed of 1200-1500r / min for 5-8min, and a high speed of 2000-2500r / min for 3-5min, so as to generate a preliminary defoaming self-healing mixture;

[0068] Step S14: adding 55 g of polypropylene and 5 g of an auxiliary agent to the preliminary defoaming self-repairing mixture and continuing to perform densification and uniform stirring in a gradient temperature and pressure manner to generate a defoaming self-repairing densified uniform mixture;

[0069] Step S15: placing the defoaming self-repairing densified uniform mixture in an environment of 15° C.-20° C. and leaving it to stand for 20-30 minutes to generate a defoaming self-repairing viscous uniform mixture.

[0070] As an embodiment of the present invention, refer to Figure 2 As shown, Figure 1 Detailed step flow diagram of step S1 in FIG. 1 , in this embodiment, step S1 includes the following steps:

[0071] Step S11: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula;

[0072] In the embodiment of the present invention, appropriate raw materials and proportions are selected based on the physical properties of the raw materials of the polypropylene defoaming masterbatch, the requirements for the defoaming effect and the performance of the final product. The determination of this proportion is based on experimental data and a comprehensive consideration of the defoaming effect and the self-repairing performance. Through repeated experimental debugging, the determined proportion can ensure the best balance between the defoaming performance and the self-repairing ability, and finally obtain the mixing ratio of the polypropylene defoaming masterbatch formula, specifically 10%-30% polyether defoamer, 10%-20% self-repairing material, 40%-60% polypropylene and 1%-5% additives (such as Figure 4 shown).

[0073] Step S12: weighing a certain amount of 20g of polyether defoamer and 15g of self-healing material according to the mixing ratio of the polypropylene defoaming masterbatch formula with 100g as the standard, and adding 20g of the polyether defoamer and 15g of the self-healing material into a high-speed mixing device;

[0074] In an embodiment of the present invention, after the mixing ratio of the polypropylene defoaming masterbatch formula is determined, a specific amount (20-60 parts, etc.) of each raw material is weighed according to the mixing ratio of the polypropylene defoaming masterbatch formula and 100g is used as the standard, 20g of polyether defoaming agent and 15g of self-healing material are weighed for each part, and an electronic precision balance is used to ensure the accuracy of the weighing. After the weighing is completed, 20g of polyether defoaming agent and 15g of self-healing material are respectively added to the silo of the high-speed mixing equipment. The high-speed mixing equipment should have a high speed and heating function so that a uniform and sufficient stirring effect can be achieved in the subsequent mixing process. The equipment should be kept clean and well protected to prevent any foreign matter from contaminating the mixture.

[0075] Step S13: using a high-speed mixing device set at a temperature of 35°C-45°C, a relative humidity of 30%-40% and a mixing environment between 1.1 times and 1.3 times the standard atmospheric pressure, 20g of the polyether defoamer and 15g of the self-healing material are fully mixed and stirred, and the stirring operation is performed in stages at a low speed of 500-800r / min for 3-5min, a medium speed of 1200-1500r / min for 5-8min, and a high speed of 2000-2500r / min for 3-5min, so as to generate a preliminary defoaming self-healing mixture;

[0076] In an embodiment of the present invention, after the weighed polyether defoamer and self-healing material are put into a high-speed mixing device, the device temperature is set to 35°C-45°C, the relative humidity is 30%-40%, and the ambient air pressure is set to between 1.1 and 1.3 times the standard atmospheric pressure. Under this condition, a staged stirring method is used for mixing. First, the speed of the mixing device is set to 500-800r / min, and stirring is continued for 3-5 minutes. Preliminary stirring is performed at a low speed gear to allow the two raw materials to initially merge. Then, the equipment is adjusted to a medium speed gear of 1200-1500r / min, and stirring is continued for 5-8 minutes to make the mixing between the raw materials more uniform. The speed is increased to 2000-2500r / min and maintained for 3-5 minutes. The final uniform stirring is performed at a high speed gear to ensure that the polyether defoamer and the self-healing material are completely mixed, and finally a preliminary defoaming self-healing mixture is generated.

[0077] Step S14: adding 55 g of polypropylene and 5 g of an auxiliary agent to the preliminary defoaming self-repairing mixture and continuing to perform densification and uniform stirring in a gradient temperature and pressure manner to generate a defoaming self-repairing densified uniform mixture;

[0078] In an embodiment of the present invention, after the preliminary mixture is completed, 55g of polypropylene and 5g of additives are added, and the densification and uniform stirring are continued by gradient temperature and pressure. The purpose of this step is to improve the hardness and stability of the masterbatch by adding polypropylene. At the same time, the addition of additives can improve the fluidity and processing properties of the final product. The 5g additives are specifically 1g of dispersant, 3g of antioxidant and 1g of plasticizer. Then, the mixture is uniformly stirred by gradient temperature and pressure. First, in the initial stage, the temperature is set to 30°C-40°C, the pressure is 0.5MPa and the duration is 10min for stirring. Secondly, in the intermediate stage, the temperature is set to 40°C-60°C, the pressure is 1.2MPa and the duration is 15min for stirring. In the final stage, the temperature is set to 60°C-80°C, the pressure is 2.0MPa and the duration is 8min for stirring, so that the polypropylene and the additives can be evenly distributed in the entire mixture, and the temperature of the mixture is ensured not to exceed the decomposition temperature of the polypropylene to avoid adverse reactions. Finally, the defoaming self-repairing densified uniform mixture is generated by stirring.

[0079] Step S15: placing the defoaming self-repairing densified uniform mixture in an environment of 15° C.-20° C. and leaving it to stand for 20-30 minutes to generate a defoaming self-repairing viscous uniform mixture.

[0080] In an embodiment of the present invention, the mixture is taken out after densification and uniform stirring, and placed in a static environment at 15°C-20°C for 20-30 minutes. The purpose of this step is to allow the mixture to cool to room temperature and complete the final solidification during the static process. At this stage, the static environment temperature should be kept constant and free of interference to avoid the influence of external factors on the quality of the mixture. During the static period, the viscosity of the mixture gradually increases to form a uniform mixture with viscous properties. At this time, the defoaming self-repairing mixture has a relatively stable physical form and can be subsequently processed and used. By standing, the interaction between polypropylene, polyether defoaming agents, self-repairing materials and additives can be ensured to be stable, and finally a defoaming self-repairing viscous uniform mixture is generated.

[0081] Furthermore, the self-healing material is specifically an epoxy resin with dynamic covalent bonds or a polyurethane and polyester with a reversible cross-linking structure.

[0082] Further, step S2 includes the following steps:

[0083] Step S21: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder, adjusting the temperature of the twin-screw extruder at the feeding stage to 150°C-170°C, the rotation speed to 80-120r / min and the pressure to 2-4MPa for initial feeding and smooth advancement, and then entering the melting stage after 3-5 minutes;

[0084] Step S22: melt-blending the defoaming self-repairing viscous uniform mixture by adjusting the corresponding temperature to 180° C.-200° C., the rotation speed to 200-250 r / min and the pressure to 6-8 MPa using a twin-screw extruder in the melting stage to generate a polypropylene defoaming self-repairing molten mixture;

[0085] Step S23: When the polypropylene defoaming self-repairing molten mixture approaches the corresponding die of the twin-screw extruder, the temperature of the twin-screw extruder is adjusted to 200° C.-250° C., the speed is 150-200 r / min, and the pressure is 8-10 MPa, and the polypropylene defoaming self-repairing molten mixture is extruded to obtain a polypropylene defoaming self-repairing masterbatch raw material;

[0086] Step S24: The polypropylene defoaming self-repairing masterbatch raw material is quickly cooled by a cooling system, and the cooled polypropylene defoaming self-repairing masterbatch raw material is pelletized and formed, and the particle size of the defoaming masterbatch is controlled to be between 100-800 μm to generate a polypropylene defoaming self-repairing masterbatch finished product.

[0087] As an embodiment of the present invention, refer to Figure 3 As shown, Figure 1 Detailed step flow diagram of step S2 in the embodiment, step S2 includes the following steps:

[0088] Step S21: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder, adjusting the temperature of the twin-screw extruder at the feeding stage to 150°C-170°C, the rotation speed to 80-120r / min and the pressure to 2-4MPa for initial feeding and smooth advancement, and then entering the melting stage after 3-5 minutes;

[0089] In an embodiment of the present invention, a pre-prepared defoaming self-repairing viscous uniform mixture is fed into the feed port of a twin-screw extruder. The feed section temperature range of the twin-screw extruder is first set to 150°C-170°C to ensure that the raw materials can flow smoothly into the extruder at an appropriate temperature and maintain their viscosity. The screw speed is then adjusted to 80-120r / min, and the extruder pressure is appropriately adjusted according to the characteristics of the feed material, usually set to 2-4MPa, to ensure that the material can be stably advanced during the feeding stage. At this stage, the material is still in a relatively dense state after the initial screw push. The friction and shearing action between the screws achieve preliminary mixing and uniform dispersion of the material. This state is maintained for 3-5 minutes to ensure the uniformity of the mixture and prepare for the subsequent melting stage.

[0090] Step S22: melt-blending the defoaming self-repairing viscous uniform mixture by adjusting the corresponding temperature to 180° C.-200° C., the rotation speed to 200-250 r / min and the pressure to 6-8 MPa using a twin-screw extruder in the melting stage to generate a polypropylene defoaming self-repairing molten mixture;

[0091] In an embodiment of the present invention, after the feeding stage is over, the material begins to enter the melting stage. At this time, it is necessary to adjust the temperature, speed and pressure of the twin-screw extruder to achieve melting and sufficient mixing of the material. During the specific operation, the temperature of the twin-screw extruder is adjusted to 180°C-200°C. This temperature range can effectively ensure the melting of the polypropylene substrate and the defoaming self-repairing material without excessive degradation or overheating. At the same time, the speed of the extruder is adjusted to 200-250r / min to ensure that the material is fully mixed by the shearing action of the screw in the molten state, so as to further improve the uniformity of the material. The pressure needs to be set between 6-8MPa to ensure that the material is fully subjected to the high pressure in the extruder during the melting process, enhance its physical properties and achieve uniform distribution of the defoaming self-repairing material. This process continues to ensure that all components achieve a good mixing effect, and finally generate a uniform polypropylene defoaming self-repairing molten mixture.

[0092] Step S23: When the polypropylene defoaming self-repairing molten mixture approaches the corresponding die of the twin-screw extruder, the temperature of the twin-screw extruder is adjusted to 200° C.-250° C., the speed is 150-200 r / min, and the pressure is 8-10 MPa, and the polypropylene defoaming self-repairing molten mixture is extruded to obtain a polypropylene defoaming self-repairing masterbatch raw material;

[0093] In an embodiment of the present invention, when the polypropylene defoaming self-repairing molten mixture approaches the die of the twin-screw extruder, the extrusion processing stage begins. At this stage, the temperature, speed and pressure need to be accurately adjusted to ensure the quality of the finished product and the uniformity of the material. First, the temperature of the die area is set to 200°C-250°C. The temperature in this range helps the material to achieve better fluidity before leaving the mold, while avoiding excessive degradation of the material due to excessive temperature. Secondly, the speed of the twin-screw extruder is adjusted to 150-200r / min. This speed can ensure that the polypropylene defoaming self-repairing molten mixture can flow fully near the die, avoiding blockage or uneven flow of the material due to too low a speed. The pressure in the die area is set to 8-10MPa to ensure that the material has sufficient driving force to pass through the mold during the extrusion process to form a stable material flow. The main purpose of this process is to extrude the molten mixture evenly and finally obtain the polypropylene defoaming self-repairing masterbatch raw material.

[0094] Step S24: The polypropylene defoaming self-repairing masterbatch raw material is quickly cooled by a cooling system, and the cooled polypropylene defoaming self-repairing masterbatch raw material is pelletized and formed, and the particle size of the defoaming masterbatch is controlled to be between 100-800 μm to generate a polypropylene defoaming self-repairing masterbatch finished product.

[0095] In an embodiment of the present invention, after the polypropylene defoaming self-repairing masterbatch raw material is extruded, it immediately enters the cooling system for rapid cooling. At this time, the cooling system uses efficient water cooling or air cooling to quickly cool the extruded material to room temperature to avoid performance degradation caused by overheating of the material. The cooled masterbatch raw material needs to be pelletized and formed by a pelletizer. The cutter of the pelletizer is closely matched with the extruder outlet to ensure that the masterbatch can be evenly cut into the required particle size after cooling. During the pelletizing process, the pelletizing speed and the tool gap must be accurately controlled to ensure that the particle size of the masterbatch is between 100-800μm. This particle size range helps the defoaming self-repairing masterbatch to effectively exert its characteristics and be evenly mixed with other raw materials in subsequent applications. Through this operation, the polypropylene defoaming self-repairing masterbatch finished product is finally generated.

[0096] Further, step S3 includes the following steps:

[0097] Step S31: 1-3% of the finished polypropylene defoaming self-repairing masterbatch is weighed by an electronic balance and added to the defoaming test device and the polypropylene substrate in the polypropylene processing process for defoaming test treatment, so as to adjust the control temperature range to 190°C-230°C and the rotation speed to 50-150r / min to generate the defoaming test process of the polypropylene defoaming self-repairing masterbatch;

[0098] In an embodiment of the present invention, 1-3% of the previously prepared polypropylene defoaming self-repairing masterbatch finished product is accurately weighed by using an electronic balance. The finished product needs to be evenly added to the defoaming test device in the polypropylene processing process. The test device should have the function of controlling temperature and rotation speed. The temperature range is set between 190°C and 230°C, and the rotation speed is set to 50 to 150r / min. After the polypropylene substrate and the masterbatch are mixed, defoaming treatment is carried out under this environmental condition. The purpose is to simulate the performance of the defoaming effect in the actual processing process. By setting reasonable temperature and rotation speed, the masterbatch is fully mixed in the polypropylene substrate and the defoaming effect is exerted. The test continues until obvious foam changes are observed, and finally the defoaming test process of the generated polypropylene defoaming self-repairing masterbatch is recorded.

[0099] Step S32: performing defoaming evaluation measurement on the defoaming test process of the polypropylene defoaming self-repairing masterbatch to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch;

[0100] In an embodiment of the present invention, a detailed evaluation is performed on the defoaming test process of the previously recorded and generated polypropylene defoaming self-repairing masterbatch. During this process, a precise foam height meter and a timing device are used to measure the defoaming time and the foam height. The defoaming time refers to the time required from the beginning of foam formation to complete elimination, and the foam height refers to the maximum height corresponding to each time point after the foam is formed. To ensure the accuracy of the test results, multiple measurements are required during the test, and the changes in foam height for each test are recorded, and the duration is compared to ensure the reliability and consistency of the data for each test, and finally the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch are generated.

[0101] Step S33: Based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated using the polypropylene defoaming efficiency measurement calculation formula to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch.

[0102] In an embodiment of the present invention, a suitable polypropylene defoaming efficiency measurement calculation formula is formed by combining the defoaming time of the polypropylene defoaming masterbatch, the time node of the defoaming process, the foam height of the polypropylene defoaming masterbatch, the foam height change rate, the defoaming height exponential attenuation factor and related parameters to quantitatively calculate the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product, so as to quantify the defoaming efficiency measurement value of each polypropylene defoaming self-repairing masterbatch with different components, and finally obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch.

[0103] Furthermore, the polypropylene defoaming efficiency measurement calculation formula in step S33 is specifically:

[0104]

[0105] In the formula, E s is the defoaming efficiency measure of polypropylene defoaming masterbatch, T s is the defoaming time of polypropylene defoaming masterbatch, t is the time node of the defoaming process, H(t) is the foam height of polypropylene defoaming masterbatch at the time node t, is the foam height change rate, exp is the exponential function, α is the defoaming height exponential attenuation factor, and η is the correction coefficient of the defoaming efficiency measurement value of polypropylene defoaming masterbatch.

[0106] The present invention obtains a polypropylene defoaming efficiency measurement calculation formula by using a specific mathematical model and after verification, which is used to quantitatively calculate the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product. The polypropylene defoaming efficiency measurement calculation formula can effectively measure the defoaming speed and the persistence of the foam in the defoaming process by comprehensively considering the change of foam height and its change rate. The effect of the defoaming masterbatch can be clearly and quantitatively evaluated through the data of the defoaming time and the change of foam height. In particular, the exponential function quantifies the attenuation characteristics of the foam height, which can reflect the stability and disappearance speed of the foam in the defoaming process. The defoaming process is often not linear, and the disappearance speed of the foam may change with the change of the foam height. The exponential decay factor α in the formula can just describe the nonlinear characteristics of the foam changing with time and height. Different foam heights correspond to different defoaming rates. The introduction of the exponential decay factor enables the formula to more realistically simulate the actual defoaming process. In this formula, the foam height and the foam height change rate work together to fully reflect the actual performance of the defoaming masterbatch. By combining the foam height and the defoaming rate, not only can the defoaming time be evaluated, but also the dynamic process of defoaming can be captured through the change rate. Specifically, It reflects the speed of defoaming, while the foam height reflects the residual effect of defoaming. The combination of the two makes the quantitative evaluation of defoaming efficiency more accurate. The foam height and its change rate in the defoaming process are weighted averaged through the integral formula. The defoaming efficiency measurement value finally obtained by the formula provides a comprehensive quantitative indicator of the defoaming effect. This value can intuitively show the efficiency of the defoaming masterbatch in the defoaming process, thereby providing data support for formula optimization. For example, by adjusting the foam height exponential attenuation factor or correction coefficient, the defoaming characteristics of the masterbatch can be accurately adjusted, thereby optimizing the defoaming performance of the final product. In addition, the introduction of the correction coefficient can take into account some additional influencing factors in the experiment, such as equipment differences, environmental changes, etc., to further improve the accuracy and applicability of the formula. The introduction of this coefficient makes the defoaming efficiency measurement more suitable for practical applications under different production conditions. In summary, this formula fully considers the defoaming efficiency measurement value E of the polypropylene defoaming masterbatch. s , polypropylene defoaming masterbatch defoaming time T s, defoaming process time node t, polypropylene defoaming masterbatch foam height H(t) at time node t, foam height change rate Exponential function exp, defoaming height exponential decay factor α, correction coefficient η of defoaming efficiency measurement value of polypropylene defoaming masterbatch, according to the defoaming efficiency measurement value E of polypropylene defoaming masterbatch s The correlation between the above parameters constitutes a functional relationship The formula can realize the quantitative calculation process of the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product. At the same time, the introduction of the correction coefficient η of the defoaming efficiency measurement value of the polypropylene defoaming masterbatch can be adjusted according to the error occurring in the calculation process, thereby improving the accuracy and applicability of the polypropylene defoaming efficiency measurement calculation formula.

[0107] Furthermore, the present invention also provides a defoaming masterbatch preparation system based on a self-repairing material, which is used to perform the defoaming masterbatch preparation method based on a self-repairing material as described above. The defoaming masterbatch preparation system based on a self-repairing material comprises:

[0108] The defoaming masterbatch mixture uniform stirring module is used to obtain the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, a certain amount of polyether defoaming agent and self-repairing material are weighed and fully mixed and stirred using a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; polypropylene and additives are added to the preliminary defoaming self-repairing mixture, and the mixture is continuously stirred and allowed to stand, thereby generating a defoaming self-repairing viscous uniform mixture;

[0109] The defoaming masterbatch melt blending extrusion preparation module is used to feed the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjust the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product;

[0110] The defoaming efficiency evaluation module of the finished product of defoaming masterbatch is used to add the finished product of polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement, so as to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch;

[0111] The defoaming masterbatch finished product quality detection module is used to perform defoaming quality detection on the corresponding polypropylene defoaming self-repairing masterbatch finished product based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch to generate a polypropylene defoaming self-repairing stable masterbatch.

[0112] Therefore, the embodiments should be regarded as illustrative and non-restrictive from all points, and the scope of the present invention is limited by the appended claims rather than the above description, and it is therefore intended that all changes falling within the meaning and range of equivalent elements of the application documents are included in the present invention.

[0113] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A method for preparing a defoaming masterbatch based on a self-repairing material, characterized in that: The following steps are involved: Step S1: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, weighing a certain amount of polyether defoaming agent and self-repairing material and fully mixing and stirring them with a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; adding polypropylene and additives to the preliminary defoaming self-repairing mixture, continuing to stir and standing to generate a defoaming self-repairing viscous and uniform mixture; Step S2: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjusting the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800 μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product; Step S3: adding the finished polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch; Step S4: Based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch, the corresponding polypropylene defoaming self-repairing masterbatch finished product is tested for defoaming quality to generate a polypropylene defoaming self-repairing stable masterbatch.

2. The method for preparing a defoaming masterbatch based on a self-repairing material according to claim 1, characterized in that: Step S1 includes the following steps: Step S11: obtaining the mixing ratio of the polypropylene defoaming masterbatch formula; Step S12: weighing a certain amount of 20g of polyether defoamer and 15g of self-healing material according to the mixing ratio of the polypropylene defoaming masterbatch formula with 100g as the standard, and adding 20g of the polyether defoamer and 15g of the self-healing material into a high-speed mixing device; Step S13: using a high-speed mixing device set at a temperature of 35°C-45°C, a relative humidity of 30%-40% and a mixing environment between 1.1 times and 1.3 times the standard atmospheric pressure, 20g of the polyether defoamer and 15g of the self-healing material are fully mixed and stirred, and the stirring operation is performed in stages at a low speed of 500-800r / min for 3-5min, a medium speed of 1200-1500r / min for 5-8min, and a high speed of 2000-2500r / min for 3-5min, so as to generate a preliminary defoaming self-healing mixture; Step S14: adding 55 g of polypropylene and 5 g of an auxiliary agent to the preliminary defoaming self-repairing mixture and continuing to perform densification and uniform stirring in a gradient temperature and pressure manner to generate a defoaming self-repairing densified uniform mixture; Step S15: placing the defoaming self-repairing densified uniform mixture in an environment of 15° C.-20° C. and leaving it to stand for 20-30 minutes to generate a defoaming self-repairing viscous uniform mixture.

3. The method for preparing defoaming masterbatch based on self-repairing material according to claim 2, characterized in that: The specific mixing ratio of the polypropylene defoaming masterbatch formula described in step S11 is 10%-30% polyether defoaming agent, 10%-20% self-repairing material, 40%-60% polypropylene and 1%-5% additive.

4. The method for preparing defoaming masterbatch based on self-repairing material according to claim 3, characterized in that: The self-healing material is specifically an epoxy resin with dynamic covalent bonds or a polyurethane and polyester with a reversible cross-linking structure.

5. The method for preparing defoaming masterbatch based on self-repairing material according to claim 2, characterized in that: The 5 g of auxiliary agent in step S14 specifically includes 1 g of dispersant, 3 g of antioxidant and 1 g of plasticizer.

6. The method for preparing defoaming masterbatch based on self-repairing material according to claim 2, characterized in that: The method of gradient temperature pressing described in step S14 is specifically: In the initial stage, the temperature was set to 30°C-40°C, the pressure was set to 0.5MPa and the duration was set to 10min for stirring; In the intermediate stage, the temperature was set to 40°C-60°C, the pressure was set to 1.2 MPa and the duration was set to 15 min for stirring; In the final stage, the temperature was set to 60°C-80°C, the pressure was set to 2.0 MPa and the duration was 8 minutes for stirring.

7. The method for preparing defoaming masterbatch based on self-repairing material according to claim 1, characterized in that: Step S2 includes the following steps: Step S21: feeding the defoaming self-repairing viscous uniform mixture into a twin-screw extruder, adjusting the temperature of the twin-screw extruder at the feeding stage to 150°C-170°C, the rotation speed to 80-120r / min and the pressure to 2-4MPa for initial feeding and smooth advancement, and then entering the melting stage after 3-5 minutes; Step S22: melt-blending the defoaming self-repairing viscous uniform mixture by adjusting the corresponding temperature to 180° C.-200° C., the rotation speed to 200-250 r / min and the pressure to 6-8 MPa using a twin-screw extruder in the melting stage to generate a polypropylene defoaming self-repairing molten mixture; Step S23: When the polypropylene defoaming self-repairing molten mixture approaches the corresponding die of the twin-screw extruder, the temperature of the twin-screw extruder is adjusted to 200° C.-250° C., the speed is 150-200 r / min, and the pressure is 8-10 MPa, and the polypropylene defoaming self-repairing molten mixture is extruded to obtain a polypropylene defoaming self-repairing masterbatch raw material; Step S24: The polypropylene defoaming self-repairing masterbatch raw material is quickly cooled by a cooling system, and the cooled polypropylene defoaming self-repairing masterbatch raw material is pelletized and formed, and the particle size of the defoaming masterbatch is controlled to be between 100-800 μm to generate a polypropylene defoaming self-repairing masterbatch finished product.

8. The method for preparing defoaming masterbatch based on self-repairing material according to claim 1, characterized in that: Step S3 includes the following steps: Step S31: 1-3% of the finished polypropylene defoaming self-repairing masterbatch is weighed by an electronic balance and added to the defoaming test device and the polypropylene substrate in the polypropylene processing process for defoaming test treatment, so as to adjust the control temperature range to 190°C-230°C and the rotation speed to 50-150r / min to generate the defoaming test process of the polypropylene defoaming self-repairing masterbatch; Step S32: performing defoaming evaluation measurement on the defoaming test process of the polypropylene defoaming self-repairing masterbatch to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; Step S33: Based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated using the polypropylene defoaming efficiency measurement calculation formula to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch.

9. The method for preparing defoaming masterbatch based on self-repairing material according to claim 8, characterized in that: The polypropylene defoaming efficiency measurement calculation formula in step S33 is specifically: In the formula, E s is the defoaming efficiency measure of polypropylene defoaming masterbatch, T s is the defoaming time of polypropylene defoaming masterbatch, t is the time node of the defoaming process, H(t) is the foam height of polypropylene defoaming masterbatch at the time node t, is the foam height change rate, exp is the exponential function, α is the defoaming height exponential attenuation factor, and η is the correction coefficient of the defoaming efficiency measurement value of polypropylene defoaming masterbatch.

10. A defoaming masterbatch preparation system based on self-repairing materials, characterized in that: For executing the method for preparing defoaming masterbatch based on self-repairing material according to claim 1, the defoaming masterbatch preparation system based on self-repairing material comprises: The defoaming masterbatch mixture uniform stirring module is used to obtain the mixing ratio of the polypropylene defoaming masterbatch formula, and based on the mixing ratio of the polypropylene defoaming masterbatch formula, a certain amount of polyether defoaming agent and self-repairing material are weighed and fully mixed and stirred using a high-speed mixing device to generate a preliminary defoaming self-repairing mixture; polypropylene and additives are added to the preliminary defoaming self-repairing mixture, and the mixture is continuously stirred and allowed to stand, thereby generating a defoaming self-repairing viscous uniform mixture; The defoaming masterbatch melt blending extrusion preparation module is used to feed the defoaming self-repairing viscous uniform mixture into a twin-screw extruder for melt blending and extrusion into particles, and adjust the temperature, speed and pressure of the twin-screw extruder to control the particle size of the defoaming masterbatch to be between 100-800μm, so as to produce a polypropylene defoaming self-repairing masterbatch finished product; The defoaming efficiency evaluation module of the finished product of defoaming masterbatch is used to add the finished product of polypropylene defoaming self-repairing masterbatch to the polypropylene processing process for defoaming test evaluation and measurement, so as to generate the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch; based on the defoaming time of the polypropylene defoaming masterbatch and the foam height of the polypropylene defoaming masterbatch, the defoaming efficiency of the corresponding polypropylene defoaming self-repairing masterbatch finished product is quantitatively calculated to obtain the defoaming efficiency measurement value of the polypropylene defoaming masterbatch; The defoaming masterbatch finished product quality detection module is used to perform defoaming quality detection on the corresponding polypropylene defoaming self-repairing masterbatch finished product based on the defoaming efficiency measurement value of the polypropylene defoaming masterbatch to generate a polypropylene defoaming self-repairing stable masterbatch.

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