Production system of extinction polyvinyl chloride resin

Abstract

The utility model provides a production system of delustering polyvinyl chloride resin. The production system comprises a delustering agent weighing tank, a delustering agent conveying pump, a polymerization kettle, a control unit and a centrifugal mother liquor water pipeline, the delustering agent weighing tank is used for controlling the adding amount of a delustering agent, a jacket is arranged on the outer layer of the delustering agent weighing tank to serve as a shell pass of the delustering agent storage barrel and is communicated with a centrifugal mother liquor pipeline, centrifugal mother liquor serves as heat tracing water to be introduced into the jacket, the delustering agent is stored at a certain temperature, heat recovery is achieved, and the energy consumption is reduced. Meanwhile, a preset temperature can be realized without preheating the delustering agent, so that the occupied area of equipment is saved.

Description

Technical Field

[0001] This utility model belongs to the field of polyvinyl chloride resin production technology, specifically relating to a production system for matte polyvinyl chloride resin. Background Technology

[0002] Matte PVC resin is a high-molecular polymer. Compared with ordinary PVC resin, it contains some gel components, has a regular resin particle size, good plasticizing properties, and good processability over a wide temperature range. It also possesses better solvent resistance, mechanical properties, and dimensional stability. Products made from it do not experience surface degradation even after purification treatment. Furthermore, the products have a high matte appearance and a non-sticky, comfortable feel. Matte PVC resin can be used alone or blended with general-purpose PVC resin; the gloss and other properties of the products can be adjusted by modifying the formulation. The main applications of matte PVC resin are in the production of matte cables, and in the transportation industry, it is used to make matte dashboards, buttons, automotive trim, matte leather, and aircraft flooring. In chemical building materials, it is used to make matte laminates and matte interior wall panels. It can also be used to produce various matte and frosted glass sheets and plates, matte signs, and matte tool sleeves, etc., with a broad market prospect.

[0003] However, in the current production process of matte polyvinyl chloride resin, the addition of matting agents cannot be precisely controlled. Utility Model Content

[0004] This invention provides a production system for matte polyvinyl chloride resin, which solves the problem of inaccurate control of the addition of matting agent in the prior art.

[0005] This utility model provides a production system for matting polyvinyl chloride resin, comprising: a matting agent weighing tank, a matting agent delivery pump, a polymerization reactor, a control unit, and a centrifugal mother liquor water pipeline; the outlet of the matting agent weighing tank is connected to the inlet of the matting agent delivery pump, and the outlet of the matting agent delivery pump is connected to the inlet of the polymerization reactor; the control unit is connected to both the matting agent delivery pump and the matting agent weighing tank; the outer layer of the matting agent weighing tank is provided with a jacket, and the centrifugal mother liquor water pipeline is connected to the inlet of the jacket; the control unit includes a temperature regulating valve and a temperature sensor; the temperature sensor is connected to the matting agent weighing tank, and the temperature regulating valve is located on the centrifugal mother liquor water pipeline.

[0006] Compared with the prior art, the advantages of this utility model are: the addition amount of matting agent is controlled by using a matting agent weighing tank. The outer layer of the matting agent weighing tank is provided with a jacket as the shell side of the matting agent storage tank, which is connected to the centrifugal mother liquor water pipeline. The centrifugal mother liquor water is used as hot water to be introduced into the jacket so that the matting agent is stored at a certain temperature and heat recovery is realized. At the same time, the matting agent does not need to be preheated to achieve the preset temperature, saving equipment floor space.

[0007] Furthermore, the control unit also includes a liquid level sensor, a flow sensor, a pressure sensor, and a frequency converter; the liquid level sensor is connected to the matting agent weighing tank, and the outlet of the matting agent delivery pump is sequentially connected to the flow sensor, the pressure sensor, and the frequency converter.

[0008] Furthermore, it also includes a matting agent storage tank and a pneumatic diaphragm pump; the outlet of the matting agent storage tank is connected to the pneumatic diaphragm pump, and the outlet of the pneumatic diaphragm pump is connected to the inlet of the matting agent weighing tank.

[0009] Furthermore, it also includes a return pipeline; the outlet of the matting agent delivery pump is also connected to the return port of the matting agent weighing tank through the return pipeline.

[0010] Furthermore, the matting agent weighing tank is made of stainless steel with an enamel lining and has a volume of 5~10 m³; and / or, the matting agent delivery pump is a metering pump with a maximum delivery flow rate of 3.5 m³ / h, a head of 150~180 m, and the liquid contact part is made of stainless steel.

[0011] Furthermore, the pneumatic diaphragm pump has a maximum flow rate of 2.5 m³ / h, a maximum working pressure of 0.69 MPa, a head of 5-8 m, uses instrument air with a pressure of 0.1-0.8 MPa, and the liquid-contacting part is made of one or more of PP polypropylene, PVDF polyvinylidene fluoride, PPH modified polypropylene, conductive PP polypropylene, and conductive PVDF polyvinylidene fluoride; and / or, the matting agent storage tank is a closed plastic tank with dimensions of φ600 mm × 925 mm and a volume of 200 L. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a production system for matte polyvinyl chloride resin in one embodiment of the present invention.

[0013] Explanation of reference numerals in the attached figures:

[0014] 1. Polymerization reactor; 2. Matting agent storage tank; 3. Pneumatic diaphragm pump; 4. Matting agent weighing tank; 5. Centrifugal mother liquor water pipeline; 6. Temperature regulating valve; 7. Temperature sensor; 8. Liquid level sensor; 9. Matting agent delivery pump; 10. Frequency converter; 11. Flow sensor; 12. Pressure sensor; 13. Shut-off valve. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please see Figure 1 This utility model provides a production system for matte polyvinyl chloride resin, comprising: a matting agent weighing tank 4, a matting agent delivery pump 9, a polymerization reactor 1, a control unit, and a centrifugal mother liquor water pipeline 5; the outlet of the matting agent weighing tank 4 is connected to the inlet of the matting agent delivery pump 9, and the outlet of the matting agent delivery pump 9 is connected to the inlet of the polymerization reactor 1; the control unit is connected to both the matting agent delivery pump 9 and the matting agent weighing tank 4; the outer layer of the matting agent weighing tank 4 is provided with a jacket, and the centrifugal mother liquor water pipeline 5 is connected to the inlet of the jacket; the control unit includes a temperature regulating valve 6 and a temperature sensor 7; the temperature sensor 7 is connected to the matting agent weighing tank 4, and the temperature regulating valve 6 is installed on the centrifugal mother liquor water pipeline 5.

[0017] The matting agent weighing tank 4 can measure the weight of the matting agent and directly reflect the amount of matting agent added. The outer jacket of the matting agent weighing tank 4 serves as the shell side of the matting agent storage tank 2 and is connected to the centrifugal mother liquor water pipeline 5. This pipeline is used to inject centrifugal mother liquor water into the jacket of the matting agent weighing tank 4. The centrifugal mother liquor water is water removed by a centrifuge during the production of polyvinyl chloride resin. Its temperature is about 60°C. It is used as hot water and is introduced into the jacket of the matting agent tank to store the matting agent at a certain temperature and achieve heat recovery. At the same time, the matting agent does not need to be preheated to achieve the preset temperature, saving equipment floor space.

[0018] Optionally, a temperature regulating valve 6 is installed on the centrifugal mother liquor water pipeline 5. The temperature regulating valve 6 is connected to the DCS control system and uses PID control to regulate the temperature of the matting agent weighing tank 4 so that the temperature of the matting agent weighing tank 4 is 0~30℃.

[0019] Furthermore, the control unit also includes a liquid level sensor 8, a flow sensor 11, a pressure sensor 12, and a frequency converter 10; the liquid level sensor 8 is connected to the matting agent weighing tank 4, and the outlet of the matting agent delivery pump 9 is sequentially connected to the flow sensor 11, the pressure sensor 12, and the frequency converter 10.

[0020] In one embodiment, the level sensor 8, flow sensor 11, pressure sensor 12 and frequency converter 10 are all connected to the DCS control system, and PID control is used to adjust the flow rate of the matting agent delivery pump 9.

[0021] During use, the matting agent weighing tank 4 is equipped with a weight display. When the polymerization reactor 1 reacts for a certain time, a certain amount of matting agent is added into the reactor. When the pressure sensor 12 on the inlet pipeline reaches the set pressure, the shut-off valve 13 inlet is opened. The addition process is controlled to add a certain flow rate at a uniform speed. The weighing weight of the matting agent weighing tank 4 is cross-checked with the cumulative amount of the flow sensor 11, which further increases the accuracy of the production system.

[0022] In one embodiment, the system further includes a matting agent storage tank 2 and a pneumatic diaphragm pump 3 located in the additive preparation process; the outlet of the matting agent storage tank 2 is connected to the pneumatic diaphragm pump 3, and the outlet of the pneumatic diaphragm pump 3 is connected to the inlet of the matting agent weighing tank 4.

[0023] In one embodiment, a return line is also included; the outlet of the matting agent delivery pump 9 is also connected to the return port of the matting agent weighing tank 4 via the return line; excess matting agent is recovered for reuse.

[0024] In one embodiment, the matting agent weighing tank 4 is made of stainless steel with an enamel lining and has a volume of 5~10m³; the matting agent delivery pump 9 is a metering pump with a maximum delivery flow rate of 3.5m³ / h and a head of 150~180m, and the liquid contact part is made of stainless steel; optionally, two matting agent delivery pumps 9 are provided for alternating use.

[0025] The pneumatic diaphragm pump 3 has a maximum flow rate of 2.5 m³ / h, a maximum working pressure of 0.69 MPa, a head of 5-8 m, uses instrument air with a pressure of 0.1-0.8 MPa, and the liquid-contacting part is made of one or more of the following: PP polypropylene, PVDF polyvinylidene fluoride, PPH modified polypropylene, conductive PP polypropylene, and conductive PVDF polyvinylidene fluoride. The matting agent storage tank 2 is a closed plastic tank with dimensions of φ600 mm × 925 mm and a volume of 200 L.

[0026] In practice, when using the above-mentioned production system to produce matte polyvinyl chloride resin, the following steps are included: The polymerization reactor 1 starts reacting and the reaction time is set to 100-230 minutes. A matting agent delivery pump 9 is started. After the pressure sensor 12 at the outlet of the matting agent delivery pump 9 reaches 0.3-2.0 MPa, the shut-off valve 13 at the top of the polymerization reactor 1 is opened, and 100-300 kg of matting agent is added to the polymerization reactor 1. The matting agent addition time is set to 40-90 minutes. The addition flow rate is automatically adjusted and controlled by DCS according to the amount of matting agent added and the addition time requirements to ensure that the addition of matting agent is completed within the specified time.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. If these modifications and variations fall within the scope of the claims of this utility model and their equivalents, they should be considered to be within the protection scope of this utility model.

Claims

1. A production system of a matt polyvinyl chloride resin, characterized by comprising: The utility model relates to a kind of quenching agent feeding device, including: Quenching agent weighing tank (4), quenching agent conveying pump (9), polymerizer (1), control unit and centrifugal mother liquor water pipeline (5); The outlet of the quenching agent weighing tank (4) is communicated with the inlet of the quenching agent conveying pump (9), and the outlet of the quenching agent conveying pump (9) is communicated with the inlet of the polymerizer (1); The control unit is connected with the quenching agent conveying pump (9) and the quenching agent weighing tank (4) respectively; The outer layer of the quenching agent weighing tank (4) is provided with a jacket, and the centrifugal mother liquor water pipeline (5) is communicated with the inlet of the jacket; The control unit includes a temperature regulating valve (6) and a temperature sensor (7); The temperature sensor (7) is connected with the quenching agent weighing tank (4), and the temperature regulating valve (6) is arranged on the centrifugal mother liquor water pipeline (5).

2. The matt polyvinyl chloride resin production system according to claim 1, characterized by, The control unit further includes a liquid level sensor (8), a flow sensor (11), a pressure sensor (12) and a frequency converter (10); The liquid level sensor (8) is connected with the quenching agent weighing tank (4), and the outlet of the quenching agent conveying pump (9) is sequentially connected with the flow sensor (11), the pressure sensor (12) and the frequency converter (10).

3. The matt polyvinyl chloride resin production system according to claim 1, characterized by, It further includes a quenching agent storage barrel (2) and a pneumatic diaphragm pump (3); The outlet of the quenching agent storage barrel (2) is communicated with the pneumatic diaphragm pump (3), and the outlet of the pneumatic diaphragm pump (3) is communicated with the inlet of the quenching agent weighing tank (4).

4. The matting PVC resin production system according to claim 1, wherein It further includes a reflux pipeline; The outlet of the quenching agent conveying pump (9) is further communicated with the reflux port of the quenching agent weighing tank (4) through the reflux pipeline.

5. The system for producing a matt polyvinyl chloride resin according to any one of claims 1 to 4, characterized in that, The quenching agent weighing tank (4) is made of stainless steel lining enamel material, and has a volume of 5-10 m³; and / or The quenching agent conveying pump (9) is a metering pump, with a maximum conveying flow rate of 3.5 m³ / h, a lift of 150-180 m, and a liquid receiving part made of stainless steel.

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