WO2021237655A1

WO2021237655A1 - Liquid additive assisted polymer extrusion and blending method and device and use thereof

Info

Publication number: WO2021237655A1
Application number: PCT/CN2020/093191
Authority: WO
Inventors: 李东; 马鹏涛; 叶南飚; 黄险波; 廖洋威; 于亚勇
Original assignee: 金发科技股份有限公司
Priority date: 2020-05-26
Filing date: 2020-05-29
Publication date: 2021-12-02
Also published as: CN111531839A

Abstract

A liquid additive assisted polymer extrusion and blending method and device. The solution lies in that: converting a raw material mixture into a melt, continuously injecting a liquid additive into the interior of the melt so that the additive is fully fused with the melt to form a uniform fusion, and finally performing dehydration and devolatilization, so as to obtain a target product.

Description

Method, device and application of liquid additive assisted polymer extrusion and blending

Technical field

The invention belongs to the technical field of polymer materials, and specifically relates to a method, a device and an application of a liquid additive assisted polymer extrusion blending.

Background technique

Polymer materials often need to be modified and prepared into blends to meet different product requirements. Usually, other polymers, fillers, reinforcements, flame retardants and other components are added to the polymer, and the twin-screw extruder, single-screw extruder, internal mixer and other equipment are used for melt mixing, extrusion granulation, etc. Preparation of modified polymer materials.

Conventional extrusion blending adopts changing the screw combination, screw speed, feeding method, processing temperature and other equipment and process conditions of the twin-screw extruder to achieve stable extrusion blending and achieve the required product performance. It is often necessary to dry the materials to remove water before extrusion and blending, such as polyamide, acrylonitrile-butadiene-styrene terpolymers, polyacrylates and other resins to avoid material degradation during processing , Discoloration and other defects. For hydrolysis-resistant multi-phase unstable polymer systems, vacuuming is often used during the blending modification process to drain the moisture and volatiles from the material. For polypropylene materials that have been modified to toughen and strengthen various components used in automotive interiors, a certain amount of water can be added to the particle mixture to improve its odor and sensory. However, the water in the particle mixture is often After the high-temperature barrel is in contact, it becomes water vapor and most of it is lost. The effect is limited, and the lost water vapor is discharged through the feed port of the extruder, which affects the smooth feeding of materials, and to a certain extent, it affects the output and production stability. sex. In addition, for some additives that are melted by heating, easily decomposed by heating, and easily volatile when heated, such as low melting point additives, flame retardants, processing oils, etc., when the materials are blended, they are limited by the characteristics of the materials and are difficult to mix uniformly. The nature of the process changes, which affects the quality of the product.

Existing, such as Chinese patent application CN11082007, "A method for preparing high-performance nano-polyester filament", in the disclosed step (2), "put the dried polyester chips and additives into the screw extruder" Additives are added by the method of "medium melting". Because the screw extruder processes the polymer under the dual action of the shear heat generated by the screw rotation and external heating, and the shear heat accounts for a large proportion. Polymer is a poor conductor of heat. Excessive shear heat cannot be transferred to the screw in time and is taken away by the cooling water. As a result, the temperature of the melt material is often higher than the displayed temperature, and the temperature inside the melt is caused by the structural characteristics of the screw. There is a distribution, and even local overheating occurs at the top of the spiral ridge, and the additive vaporizes, which is detrimental to the components with poor thermal stability in the blend. The viscosity of the polymer is greatly affected by the temperature, and the uneven temperature and local high temperature during the processing process will affect the product quality.

It can be seen that in the prior art, when additives are used, vaporization and uneven distribution are likely to occur, resulting in a decrease in product quality.

Summary of the invention

In order to solve the problem of product quality degradation caused by vaporization and uneven distribution of additives in the prior art, the present invention provides a liquid additive assisted polymer extrusion blending method, device and application, which can effectively solve the above problems. problem.

In order to achieve the above object, the specific solution adopted by the present invention is: a liquid additive assisted polymer extrusion blending method, the technical solution is: after the raw material mixture is converted into a melt, the liquid additive is continuously injected into the melt Inside, the above additives and the above melt are fully fused to form a uniform fusion, and finally the target product is obtained after dehydration and devolatilization.

Specifically, it includes the following steps:

S1. The raw material mixture of the solvent-resistant multiphase non-stable polymer is fed into the screw barrel through the feeding port of the twin-screw extruder, and the screw is conveyed through the screw;

S2. After step S1, a melt of the raw material mixture described in step S1 is formed in the melting zone in the barrel;

S3. At the position of the melting zone described in step S2, the liquid additive to be added is continuously and quantitatively injected into the melting zone through a pressure applying device. The liquid additive is in an overheated state and is fully mixed with the melt described in step S2 through the action of the screw Form a fusion;

S4. The fusion material described in step S3 is transported forward through the screw, and dehydrated and devolatilized through the exhaust port downstream of the screw barrel;

S5. Obtain the target product at the discharge end of the screw barrel.

A liquid additive assisted polymer extrusion and blending device, comprising a plasticizing unit and an injection unit for preparing the target product; characterized in that: the injection unit is arranged on the plasticizing unit and forms a melt with the raw material The area is connected and arranged for injecting liquid additives into the plasticizing unit.

The plasticizing unit includes a screw barrel, a screw arranged in the screw barrel, and a feed assembly arranged at the feeding end of the screw barrel; wherein the screw barrel is provided with spaced exhaust ports near the discharge end; and The exhaust port and the vacuum chamber are respectively connected and arranged to form a negative pressure zone in the negative pressure area.

The screw barrel is provided with a mixing area for mixing the melt and the liquid additive, and the mixing area is provided with a sensor for detecting the pressure and temperature in the barrel; the vacuum chamber is connected with the external negative pressure system, and an instrument is set to detect the vacuum Room pressure.

The injection unit includes a compounding device, a storage device, and a conveying device for mixing two additives; wherein, the output end of the compounding device is connected with the input end of the storage device, and is used for quantitatively directing through a pipeline. The conveying device conveys the mixed additives; the output end of the conveying device is connected with the area where the raw material in the plasticizing unit forms a melt.

The compounding device includes a silo I, a silo II, a container, a stirring paddle, and a metering module; wherein the output ends of the silo I and the silo II communicate with the input end of the container; the container is provided with a stirring Paddle; the bottom of the container is provided with a metering module for weighing; wherein the output end of the container is connected to the storage device.

The storage device includes a storage container, a stirrer, and a weighing unit; wherein the input end of the storage container is connected with the output end of the compounding device; the storage container is provided with a stirrer; the bottom of the storage container is provided with a meter for weighing Unit; wherein the output end of the storage container is connected to the input end of the conveying device.

The delivery device includes a high-pressure metering pump; the input end of the high-pressure metering pump is connected to the output end of the storage device, and the output end of the high-pressure metering pump forms a region where a melt is formed by a one-way injection valve with the raw materials on the plasticizing unit Connected.

The basic principle of the liquid additive-assisted polymer extrusion and blending method of the present invention is: the raw material mixture of the solvent-resistant multiphase non-stable polymer is added through the feed port of the twin-screw extruder, and it is conveyed through the action of the screw. Melt and mix, open a hole in the area where the screw barrel corresponds to the mixture becoming molten, install a one-way injection unit, so that the molten material in this area completely fills the gap between the screw groove and the barrel, corresponding to the screw advancement of the injection valve The structure and other specific advancement structures make the liquid additive penetrate deep into the melt; then, the liquid additive or non-liquid additive is added to the solvent to form a solution or suspension to form a liquid additive, which is passed through a pump and tube with metering function and high-pressure delivery capability. The circuit system, the above-mentioned liquid additive is continuously and quantitatively pumped to the inside of the melt through the injection unit. Due to pressure, liquid additives and solvents at room temperature will not immediately vaporize after being heated in a high-temperature melt, but will exist in a superheated state. For example, when water is used as a solvent, they will exist in the form of superheated water, that is, subcritical water. At the same time, under the action of the high-speed rotating screw, the superheated additives and solvent components are evenly dispersed in the melt, and are transported to the downstream area with the screw. No less than one exhaust port connected to the atmosphere or negative pressure system is provided on the screw barrel in the downstream area to reduce the pressure of the fusion and vaporize the solvent in the additive, thereby smoothly extruding into a strip, and then granulating .

What needs to be clear is: subcritical water refers to: when the pressure is 2.4MPa, the boiling point of water is about 220℃; when the pressure is 2.9MPa, the boiling point of water is about 230℃; when the pressure is 4MPa, the boiling point of water is about 251℃; when the pressure is 8MPa, the boiling point of water is about 300. ℃.

The present invention also provides an application of the liquid additive assisted polymer extrusion and blending device in the production of polymers as described in the foregoing solution. Among them, polymers include low-odor polymers or other types of polymers.

Beneficial effects: The present invention helps to reduce the local high temperature inside the melt by adding the additives to the solvent to form a liquid additive, so that the overall temperature is reduced to a certain extent and is more uniform, which is beneficial to the uniformity of the mixing of the components; Under the action of, the superheated liquid additives and solvent components are evenly dispersed in the melt formed by the raw materials; when transported to the rear end of the screw barrel, they vaporize as solvent vapor and are discharged or sucked away by the negative pressure system, and the fusion A large number of bubble bursts occurred, which increased the effect of interface renewal, so that the residual monomers and small molecular components in the fusion were removed, and products with better odor and sensory were obtained; even for fillers and reinforcement components on polar surfaces, the original The method of the invention can also increase the miscibility with the matrix, improve the dispersion distribution and the interface effect in the non-polar matrix, thereby improving the quality of the product. The evaporation and loss process of the liquid additive produces a large number of bubbles and bursts, which increases the mixing effect of the fusion. In addition, for the additives that are easily melted by heating, easily decomposed by heating, and easily volatile when heated, they can be liquefied with the help of solvents, which can be accurately added on the basis of ensuring the characteristics of the additives, and the mixing is uniform.

The device of the invention has simple structure, can be directly modified on the existing double screw extruder, has small modification amount, stable operation, low failure rate, stable and reliable product quality, and solves the problems existing in the prior art.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a flow chart of a method for liquid additive assisted polymer extrusion blending.

Figure 3 is a flow chart when the two additives are mixed.

Among them, the area shown by 1021 in FIG. 1 is the area where the raw material is not completely melted; the area shown by 1023 refers to the area where the liquid additive in the superheated state and the raw material in the molten state are fused.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

In order to solve the problems in the prior art that vaporization and uneven distribution of additives are likely to occur when additives are used in the prior art, the product quality is reduced, the present invention provides a liquid additive assisted polymer extrusion blending method. After being converted into a molten material, the liquid additive is continuously injected into the molten material, so that the additive and the molten material are fully fused to form a uniform fusion, and finally dehydration and devolatilization are performed to obtain the target product.

The above-mentioned method of liquid additive assisted polymer extrusion and blending may specifically include the following steps:

S4. The fusion described in step S3 is transported forward through the screw, and the superheated liquid additive is vaporized into solvent vapor downstream of the screw barrel, and the bubbles in the fusion burst, so that the negative pressure device is used to make the residue inside the fusion The monomer and small molecule components are removed, dehydration and devolatilization are completed;

S5. Obtain the target product at the discharge end of the screw barrel.

Wherein, the liquid additive is in an overheated state after being injected into the melt.

Wherein, the liquid additive is water or a single liquid additive or suspension or a liquid containing a gaseous additive; or, the liquid additive is water, a single liquid additive, a suspension, or a liquid containing a gaseous additive. A mixture of any two of them.

If the liquid additive is a mixture of any two of a single liquid additive, a suspension, and a liquid containing a gaseous additive, the mixing process is as follows:

A. Add the above two liquid additives into their respective containers according to the ratio;

B. Output the above two liquid additives to the first mixing unit, stir and mix, and perform the first metering at the same time to obtain a first-level mixed liquid;

C. Input the first-stage mixed liquid obtained in step S2 into the second-stage mixing unit to obtain the second-stage mixed liquid, and then pass the second metering to obtain the total amount of liquid output by the second-stage mixing unit;

Wherein, if there is a liquid containing a gaseous additive in the two liquid additives described in step A, the corresponding container is set as a closed container.

The single liquid additive can be a flame retardant or a coupling agent or a processing oil; the suspension can be a mixture of a powder additive and a solution; wherein the powder additive can be a nano filler, a dispersant, or a coloring agent. Any one or more of reagents and reaction aids; wherein the solution can be water or a water-alcohol mixture; the liquid containing gaseous additives can be an aqueous solution containing carbon dioxide or a water-alcohol solution containing carbon dioxide.

The process of dehydration and devolatilization of the fusion is as follows: when the fusion is transported to the rear end of the screw barrel, since the rear end of the screw barrel is arranged with a plurality of exhaust ports and the above-mentioned exhaust ports are all connected Negative pressure device; combined with the action of the screw, a large number of bubbles in the above fusion material are broken to complete the interface reorganization of the fusion, and the gas generated by the broken bubbles is drawn out of the barrel through the negative pressure device to achieve dehydration and devolatilization.

As shown in Figure 1, a liquid additive assisted polymer extrusion and blending device includes a plasticizing unit 1 and an injection unit 2 for preparing the target product, in which:

Preferably, the plasticizing unit 1 can be modified from an existing double screw extruder. Specifically, it includes a screw barrel 101, a screw 102 arranged in the screw barrel 101, and a feeding end arranged at the feeding end of the screw barrel 101. In order to facilitate dehydration and devolatilization, the above-mentioned screw barrel 101 is provided with spaced

exhaust ports

1012, 1013 near the discharge end; and the

exhaust ports

1012, 1013 and the

vacuum chambers

107, 109 are respectively connected and arranged and the The

vacuum chambers

107 and 109 are connected to the external vacuum system, and

negative pressure meters

108 and 1010 are set to detect the pressure in the

vacuum chambers

107 and 109 respectively.

What is important is that a mixing area 1022 for mixing the melt and liquid additives is provided on the above-mentioned screw barrel 101, and a pressure sensor 105 and a temperature sensor 106 for detecting the pressure and temperature in the barrel are provided in the mixing area 1022.

What needs to be clear is that the aforementioned mixing area 1022 can be flexibly set according to actual conditions.

Wherein, the injection unit 2 includes a compounding device 201 for mixing two additives, a storage device 202, and a conveying device 204; wherein, the output end of the compounding device 201 is connected to the input end of the storage device 202, It is used to quantitatively deliver the mixed additive to the delivery device 204 through the pipeline 203; the output end of the delivery device 204 is connected to the mixing area 1022 and is used to inject the liquid additive into the melt in the mixing area 1022, and further The mixing, through the action of the screw 102, forms a uniform fusion.

The delivery device 204 includes a high-pressure metering pump 2041; the input end of the high-pressure metering pump 2041 is connected to the output end of the storage device 202, and the output end of the high-pressure metering pump 2041 can be connected to the plasticizing unit 1 through the one-way injection valve 205 The areas where the raw materials form the melt are connected.

Specifically, if the liquid additive is a solution or suspension formed by two liquid additives or a non-liquid additive and a solvent, the compounding device 201 includes a silo I2011, a silo II2012, a container 2013, a stirring paddle 2014, and a metering module 2015; Wherein, the output ends of the silo I2011 and II2012 communicate with the input of the container 2013; the container 2013 is provided with a stirring paddle 2014; the bottom of the container 2013 is provided with a weighing module 2015 for weighing;

Wherein, the output end of the container 2013 is connected to the storage device 202.

The storage device 202 includes a storage container 2021, a stirrer 2022, and a metering unit 2023; wherein the input end of the storage container 2021 is connected to the output end of the compounding device 201; the storage container 2021 is provided with a stirrer 2022; the storage container 2021 A metering unit 2023 for weighing is provided at the bottom of the, wherein the output end of the storage container 2021 is connected to the input end of the conveying device 204; the conveying device 204 includes a high-pressure metering pump 2041; the input of the high-pressure metering pump 2041 The end is connected with the output end of the storage device 202, and the output end of the high-pressure metering pump 2041 injects the liquid additive into the melt in the mixing zone 1022 through the regulating valve 2043.

In order to ensure safety, the output end of the high-pressure metering pump 2041 is also provided with a pressure relief pipe and a safety valve 2042 in parallel to form a pressure relief pipeline, which is used to relieve the pressure when the pressure in the high-pressure metering pump 2041 is too high to ensure the safety of the pipeline system .

In the working process, the metering feeding device 103 adds the material 104 to the screw barrel 101 and conveys it forward under the action of the screw 102. The material is plasticized and melted in the mixing area 1022 by the screw 102 to form a melt, and then Under the action of 102, a certain pressure is formed in the mixing area 1022. The multi-component additives are respectively placed in the silo I2011 and the silo II2012, are added to the compounding container 2013 in proportion, and are compounded into a uniform mixture under the action of the stirring paddle 2014. The metering module 2015 is used to indicate the additive ratio and the weight of the mixture. The above-mentioned uniform mixture is transported to the storage container 2021 for storing and compounding additives, and is kept uniform under the action of the agitator 2022, and the metering unit 2023 indicates the weight of the additive mixture. The additive mixture in the storage device 202 is transported to the high-pressure metering pump 2041 through the delivery pipeline 203. The high-pressure metering pump 2041 quantitatively outputs the additive mixture to the mixing area 1022 to ensure that the liquid additive is injected into the melt. The output end of the high-pressure metering pump 2041 A pressure sensor 206 can be provided to collect the internal pressure when the additive mixture is injected into the melt in the extruder. In addition, when the pressure is too high, the safety valve 2042 on the pressure relief pipe triggers a protective effect. The mixture of the additives and the melt is mixed under the action of the screw 102 in the mixing zone 1022 to form a uniform fusion. After being conveyed by the screw 102, the aforesaid fusion is moved to the

exhaust ports

1012, 1013 area, and the water and volatiles in the fusion are evacuated by the vacuum system until the fusion with additives is conveyed to the granulation unit by the screw 102.

Specific Example 1: This example provides an example using a single water as an additive, that is, a water-assisted polymer extrusion blending method to improve the odor of the product and produce a low-odor high-grade product.

Specifically, as shown in Figures 1 to 3, the metering feeding device 103 adds the material 104 to the screw barrel 101 and conveys it forward under the action of the screw 102. The material is plasticized and melted in the mixing area 1022 by the screw 102 to form a melt. , And under the action of the screw 102, a certain pressure is formed in the mixing area 1022. The multi-component additives are respectively placed in the silo I2011 and the silo II2012, are added to the compounding container 2013 in proportion, and are compounded into a uniform mixture under the action of the stirring paddle 2014. The metering module 2015 is used to indicate the additive ratio and the weight of the mixture. The above-mentioned uniform mixture is transported to the storage container 2021 for storing and compounding additives, and is kept uniform under the action of the agitator 2022, and the metering unit 2023 indicates the weight of the additive mixture. The additive mixture in the storage device 202 is transported to the high-pressure metering pump 2041 through the delivery pipeline 203. The high-pressure metering pump 2041 quantitatively outputs the additive mixture to the mixing area 1022 to ensure that the liquid additive is injected into the melt. The output end of the high-pressure metering pump 2041 A pressure sensor 206 can be provided to collect the internal pressure when the additive mixture is injected into the melt in the extruder. In addition, when the pressure is too high, the safety valve 2042 on the pressure relief pipe triggers the pressure relief protection function. The mixture of the additives and the melt is mixed under the action of the screw 102 in the mixing zone 1022 to form a uniform fusion. After being conveyed by the screw 102, the aforesaid fusion is moved to the

exhaust ports

1012, 1013 area, and the water and volatiles in the fusion are evacuated by the vacuum system until the fusion with additives is conveyed to the granulation unit by the screw 102. In this embodiment, through the method of quantitatively injecting water into the melt, the superheated water and the melt are evenly dispersed through the spiral shear action of the screw 102, and then the water is vaporized and the fusion is carried through the

exhaust ports

1012 and 1013. The volatile matter in the medium is discharged to achieve devolatilization, and a high-grade low-odor product can be obtained.

Specific embodiment 2: Compared with embodiment 1, the main difference of this embodiment is that a single liquid auxiliary agent, such as a flame retardant, a coupling agent, a processing oil, etc., is used as an additive to obtain a better material mixing effect.

As shown in Figures 1 to 3, the method of adding the liquid additives is similar to that of the water in Example 1. The main purpose is to solve the difficulties and risks of adding these liquid additives to the extruder after being conventionally mixed with materials, such as uneven mixing with materials, After mixing, agglomeration, volatilization of liquid additives, smell of liquid additives, premature decomposition of heat-sensitive additives, environmental problems, etc., the liquid additives are separately metered into the polymer melt and fully mixed to achieve uniform mixing effect and product quality Stable and easy to operate, it can further reduce the odor of the product and realize the production of high-grade and low-odor products.

The other features of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

Specific embodiment 3: Compared with embodiment 1 and embodiment 2, the main difference of this embodiment lies in the use of powder additives, such as nano fillers, dispersants, colorants, reaction aids, etc., and liquids, such as water, water- A method in which a suspension composed of an alcohol mixture and the like is used as an additive, that is, a powder additive is turned into a liquid additive to assist the extrusion and blending of a polymer.

In this embodiment, as shown in Figures 1 to 3, the additives and the liquid auxiliary additives are added to the silo I2011 and the silo II2012 respectively, and the container 2013 for compounding is added in proportion to the mixing paddle 2014 to form a homogeneous mixture. , The metering module 2015 is used to indicate the proportion of additives and the weight of the mixture. The uniform mixture is mixed by the compounding device 201 and transported to the storage container 2021 for storing the compounded additives. The uniformity is maintained under the action of the stirrer 2022. The metering unit 2023 indicates the weight of the additive mixture , The additive mixture in the rear storage device 202 is delivered to the delivery device 204 via the delivery pipeline 203. The other features of this embodiment are the same as those of

Embodiments

1 and 2, and will not be repeated.

This embodiment mainly solves the problem that a small amount of powder additives such as nano fillers and toners are difficult to be fully dispersed in the melt, and solves the problem of uneven mixing of a small amount of additives and materials during conventional mixing, resulting in fluctuations in the quality of blended and extruded products. A small amount of powder additives use liquid additives as a carrier, separately metered into the polymer melt, and fully mixed to achieve uniform mixing effect, stable product quality, and convenient operation, which can further reduce product odor and realize high-grade low-odor products, etc. Production of polymers.

Specific embodiment 4: Compared with

embodiments

1, 2 and 3, the main difference of this embodiment lies in the use of gaseous additives, such as carbon dioxide and liquids, such as water, water-alcohol mixtures, etc., as additives, that is, gaseous additives Additives become liquid additives to assist polymer extrusion blending methods.

In this embodiment, as shown in Figures 1 to 3, gaseous additives and liquid auxiliary additives are added to the airtight and pressure-keeping silo I2011 and II2012 respectively, and are added to the mixing container 2013 in proportion, and the gas is dissolved under the action of the stirring paddle 2014 In the liquid, it is compounded into a homogeneous mixture with a certain gas solubility. The metering module 2015 is used to collect the proportion of additives and the weight of the mixture, mix it into a homogeneous mixture through the sealing and pressure-keeping compounding device 201, and transport it to a sealed and pressure-keeping storage container In 2021, the metering unit 2023 indicates the weight of the additive mixture. The additive mixture in the storage device 202 that can be sealed and pressure-maintained is delivered to the delivery device 204 via the delivery pipeline 203. Other features of this embodiment are the same as those of

Embodiments

1, 2 and 3, and will not be repeated here.

This embodiment mainly solves the problem that gaseous additives, such as carbon dioxide, are difficult to add in the melt and are difficult to fully disperse. By controlling the solubility, it can be accurately metered and injected into the polymer melt with the aid of the liquid auxiliary additive as a carrier for full mixing. The volatile matter in the material is further carried and gas stripped to further reduce the odor of the product and realize the production of high-grade and low-odor products.

It should be clarified that: the metering module 2015 and the metering unit 2023 described herein may be pressure sensors; the agitating paddle 2014 and the agitator 2022 may have the same structure.

What needs to be clear is that the single liquid additive described herein can be an aqueous liquid additive.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Anyone familiar with the technical field can easily change or replace within the technical scope disclosed by the present invention. Within the protection scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.

Claims

A liquid additive assisted polymer extrusion blending method is characterized in that: after the raw material mixture is converted into a melt, the liquid additive is continuously injected into the melt, so that the additive and the melt are fully fused to form a uniform The fusion is finally dehydrated and devolatilized to obtain the target product.
A method of liquid additive assisted polymer extrusion blending according to claim 1, characterized in that it comprises the following steps:

S1. The raw material mixture of the solvent-resistant multiphase non-stable polymer is fed into the screw barrel through the feeding port of the twin-screw extruder, and the screw is conveyed through the screw;

S2. After step S1, a melt of the raw material mixture described in step S1 is formed in the melting zone in the barrel;

S3. At the position of the melting zone described in step S2, the liquid additive to be added is continuously and quantitatively injected into the melting zone through a pressure applying device. The liquid additive is in an overheated state and is fully mixed with the melt described in step S2 through the action of the screw Form a fusion;

S4. The fusion described in step S3 is transported forward through the screw, and the superheated liquid additive is vaporized into solvent vapor downstream of the screw barrel, and the bubbles in the fusion burst, so that the negative pressure device is used to make the residue inside the fusion The monomer and small molecule components are removed, dehydration and devolatilization are completed;

S5. Obtain the target product at the discharge end of the screw barrel.
The method for extrusion and blending of a liquid additive-assisted polymer according to claim 1, wherein the liquid additive is in an overheated state after being injected into the melt.
The method of liquid additive assisted polymer extrusion blending according to claim 1 or 2, wherein the liquid additive is water or a single liquid additive or suspension or a liquid containing gaseous additives;

Alternatively, the liquid additive is a mixture of any two of water, a single liquid additive, a suspension, and a liquid containing a gaseous additive.
The method for extrusion and blending of a liquid additive assisted polymer according to claim 4, characterized in that: if the liquid additive is a mixture of any two of a single liquid additive, a suspension, and a liquid containing a gaseous additive When, the mixing process is as follows:

A. Add the above two liquid additives into their respective containers according to the ratio;

B. Output the above two liquid additives to the first mixing unit, stir and mix, and perform the first metering at the same time to obtain a first-level mixed liquid;

C. Input the first-stage mixed liquid obtained in step S2 into the second-stage mixing unit to obtain the second-stage mixed liquid, and then pass the second metering to obtain the total amount of liquid output by the second-stage mixing unit;

Wherein, if there is a liquid containing a gaseous additive in the two liquid additives described in step A, the corresponding container is set as a closed container.
A liquid additive assisted polymer extrusion blending method according to claim 4 or 5, wherein the single liquid additive is a flame retardant or a coupling agent or a processing oil.
The method of liquid additive assisted polymer extrusion blending according to claim 4 or 5, wherein the suspension is a mixture of powder additive and solution;

Among them, the powder additives are any one or more of nano fillers, dispersants, colorants, and reaction aids;

Among them, the solution is water or a water-alcohol mixture.
The method for extrusion and blending of a liquid additive-assisted polymer according to claim 4 or 5, wherein the liquid containing the gaseous additive is an aqueous solution containing carbon dioxide or a water-alcohol solution containing carbon dioxide.
The method of liquid additive assisted polymer extrusion blending according to claim 1 or 2, wherein the process of dehydrating and devolatilizing the fusion is:

When the fusion is delivered to the rear end of the screw barrel, since the rear end of the screw barrel is arranged with multiple exhaust ports and the exhaust ports are all connected to a negative pressure device; combined with the action of the screw, a large amount of the fusion occurs The bubble bursts to complete the reorganization of the fusion interface, and at the same time the gas generated by the burst bubble is drawn out of the screw barrel through the negative pressure device to achieve dehydration and devolatilization.
The application of a liquid additive-assisted polymer extrusion blending method according to claim 1 or 2 in the production of low-odor products.
A liquid additive assisted polymer extrusion and blending device, comprising a plasticizing unit (1) and an injection unit (2) for preparing the target product; it is characterized in that: the injection unit (2) is set in the plasticizing unit (2) The unit (1) is provided in communication with the area where the raw material forms a melt, and is used for injecting liquid additives into the plasticizing unit (1).
A liquid additive-assisted polymer extrusion and blending device according to claim 11, characterized in that: the plasticizing unit (1) comprises a screw barrel (101), and a screw barrel (101) arranged in the screw barrel (101). The screw (102) and the feed assembly arranged at the feed end of the screw barrel (101);

Wherein, the screw barrel (101) is provided with spaced exhaust ports (1012, 1013) near the discharge end; and the exhaust ports (1012, 1013) are connected with the vacuum chamber (107, 109) respectively.
A liquid additive-assisted polymer extrusion and blending device according to claim 12, characterized in that: the screw barrel (101) is provided with a mixing zone (1022) for mixing the melt and the liquid additive, and the mixing zone (1022) is provided with a sensor for detecting the pressure and temperature in the cylinder; the vacuum chamber (107, 109) is connected with an external negative pressure system, and an instrument is set to detect the pressure in the vacuum chamber (107, 109).
A liquid additive assisted polymer extrusion blending device according to claim 11, characterized in that: the injection unit (2) comprises a compounding device (201) and a storage device (202) for mixing two additives And the conveying device (204);

Wherein, the output end of the compounding device (201) is connected with the input end of the storage device (202), and is used to quantitatively deliver the mixed additive to the delivery device (204) through the pipeline (203); The output end of the conveying device (204) is connected to the area where the raw material in the plasticizing unit (1) forms a melt.
A liquid additive assisted polymer extrusion and blending device according to claim 14, characterized in that: the compounding device (201) comprises silo I (2011), silo II (2012), container (2013), stirring paddle (2014) and metering module (2015);

Wherein, the output ends of the silo I (2011) and the silo II (2012) are connected with the input end of the container (2013); the container (2013) is provided with a stirring paddle (2014); the container (2013) is provided at the bottom There is a metering module for weighing (2015);

Wherein, the output end of the container (2013) is connected to the storage device (202).
A liquid additive assisted polymer extrusion blending device according to claim 14, characterized in that: the storage device (202) comprises a storage container (2021), a stirrer (2022) and a metering unit (2023) );

Among them, the input end of the storage container (2021) is connected with the output end of the compounding device (201); the storage container (2021) is provided with a stirrer (2022); the bottom of the storage container (2021) is provided with a meter for weighing Unit (2023);

Wherein, the output end of the storage container (2021) is connected to the input end of the conveying device (204).
A liquid additive assisted polymer extrusion and blending device according to claim 14, characterized in that: the delivery device (204) comprises a high-pressure metering pump (2041);

The input end of the high-pressure metering pump (2041) is connected to the output end of the storage device (202), and the output end of the high-pressure metering pump (2041) is connected to the raw material on the plasticizing unit (1) through the one-way injection valve (205) The areas where the melt is formed are connected.
A liquid additive assisted polymer extrusion and blending device according to claim 17, characterized in that the output end of the high-pressure metering pump (2041) is also provided with a pressure relief pipeline in parallel.
An application of the liquid additive assisted polymer extrusion blending device according to any one of claims 11 to 18 in the production of polymers.