POD stock solution and color paste mixing device and dyeing method

Abstract

The invention relates to a POD stock solution and color paste mixing device and a dyeing method.The mixing device comprises a controller, a fluid conveying main flow path, a POD stock solution kettle and a color paste kettle, the POD stock solution kettle is connected with a first air compressor through a first air flow path, and a first valve is arranged on the first air flow path; the color paste kettle is connected with a second air compressor through a second air flow path, a second valve is arranged on the second air flow path, a conveying pump, a mixing pump and an outlet pressure sensor are arranged on the fluid conveying main flow path, the POD stock solution kettle is connected with the fluid conveying main flow path through a POD stock solution flow path, a third valve is arranged on the POD stock solution flow path, and a second valve is arranged on the third valve. The color paste kettle is connected with a fluid conveying main flow path through a color paste flow path, a fourth valve and a metering pump are arranged on the color paste flow path, an inlet and an outlet of the mixing pump are communicated with a backflow loop, and a backflow valve is arranged on the backflow loop, so that the color fastness of POD fibers is greatly improved.

Description

[Technical field]

[0001] The invention relates to the field of POD fibers, and in particular to a mixing device for POD stock solution and color paste and a dyeing method. [Background technology]

[0002] Polyaromatic oxadiazole (POD) is the full name of aromatic poly-1,3,4-oxadiazole, which is a polymer material with good dimensional stability and excellent high temperature resistance. Polyaromatic oxadiazole fiber, also known as POD fiber and Baodelun, refers to a special fiber with a benzene ring and an oxadiazole ring in the main chain. Polyaromatic oxadiazole fiber has the advantages of good high temperature resistance, good flame retardancy, wear resistance, corrosion resistance, etc., and is widely used in papermaking, environmental dust removal, protective products, military and other fields.

[0003] In the prior art, POD fiber dyeing is generally performed by post-dyeing, in which the manufactured POD fiber is immersed in dyeing solution for dyeing. In our daily work, we found that the color fastness of POD fiber after post-dyeing is poor. Therefore, we developed pre-dyeing, in which the color paste and POD stock solution are fully mixed before making POD fiber. After pre-dyeing treatment, the color fastness of POD fiber is greatly improved. The present invention aims to provide such a mixing device and dyeing method of POD stock solution and color paste for pre-dyeing. [Summary of the invention]

[0004] In order to solve the above problems, the object of the present invention is to provide a mixing device and dyeing method of POD stock solution and color paste which can improve the color fastness of POD fiber.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a mixing device of POD stock solution and color paste, comprising: a controller, a fluid delivery main flow path, a POD stock solution kettle and a color paste kettle, the POD stock solution kettle is connected to a first air compressor through a first air flow path, a first valve is provided on the first air flow path, the color paste kettle is connected to a second air compressor through a second air flow path, a second valve is provided on the second air flow path, a delivery pump, a mixing pump and an outlet pressure sensor are provided on the fluid delivery main flow path, the POD stock solution kettle is connected to the fluid through the POD stock solution flow path The color paste kettle is connected to the main fluid delivery flow path, a third valve is arranged on the POD raw liquid flow path, the color paste kettle is connected to the main fluid delivery flow path through the color paste flow path, a fourth valve and a metering pump are arranged on the color paste flow path, a reflux circuit is connected between the inlet and outlet of the mixing pump, a reflux valve is arranged on the reflux circuit, the outlet pressure sensor is arranged at the outlet of the main fluid delivery flow path, and the controller is respectively connected to the first valve, the second valve, the third valve, the fourth valve, the delivery pump, the metering pump, the mixing pump, the outlet pressure sensor, the reflux valve, the first air compressor and the second air compressor.

[0006] Preferably, the device for mixing POD stock solution and color paste in the present invention is further configured as follows: the first valve is an electromagnetic ball valve.

[0007] Preferably, the device for mixing POD stock solution and color paste in the present invention is further configured as follows: the second valve is an electromagnetic ball valve.

[0008] Preferably, the device for mixing POD stock solution and color paste in the present invention is further configured as follows: the third valve is an electromagnetic ball valve.

[0009] Preferably, the device for mixing POD stock solution and color paste in the present invention is further configured as follows: the fourth valve is an electromagnetic ball valve.

[0010] Preferably, the device for mixing POD stock solution and color paste in the present invention is further configured as follows: the reflux valve is an electromagnetic reflux valve.

[0011] Preferably, the device for mixing POD stock solution and color paste in the present invention is further configured as follows: the controller is a PLC controller.

[0012] To achieve the above purpose, another technical solution adopted by the present invention is: a dyeing method, comprising the following steps: A, preparing color paste: first adding concentrated sulfuric acid to a high-speed shear emulsifier, then adding solid pigment to the high-speed shear emulsifier, the mass percentage of the concentrated sulfuric acid to the solid color is: 80:20~95:5, after emulsification in the high-speed shear emulsifier for 30~60 minutes, a uniform color paste is formed, and the color paste is transported to a color paste reactor with a stirrer, continued to stir for 1~2 hours, and then allowed to stand for degassing; B, mixing: passing compressed air into the color paste reactor to pressurize the color paste reactor to a pressure of 0.4~0.6Mpa, opening the fourth valve on the color paste flow path, the color paste enters the metering pump for metering, and then is sent to the total fluid delivery flow path, and similarly passing compressed air into the POD stock solution kettle to pressurize the POD stock solution kettle to a pressure of 0.4~0.6Mpa, opening the third valve on the POD stock solution flow path, and the POD stock solution is sent to the total fluid delivery flow path. In the flow path, the POD stock solution and the color paste in the total flow path of the fluid delivery then enter the mixing pump together for stirring and mixing and then transported to the outside of the mixing pump; C, external circulation: the mixed material of the POD stock solution and the color paste coming out of the mixing pump has a flow rate much larger than the flow rate required for the subsequent spinning, so a reflux loop is set at the inlet and outlet of the mixing pump so that the mixed material of the POD stock solution and the color paste re-enters the mixing pump through the reflux loop for mixing, so that the flow rate of the mixed material of the POD stock solution and the color paste at the outlet of the total flow path of the fluid delivery is adapted to the flow rate required for the subsequent spinning; D, spinning: the mixed material of the POD stock solution and the color paste is transported to the spinning metering pump through a pipeline, and enters the spinneret for spinning after precise metering; E, coagulation and washing: after the spinning stock solution is ejected from the spinneret, it enters a coagulation bath composed of dilute sulfuric acid for coagulation, and then undergoes processes such as drawing, neutralization, washing, drying, shaping, oiling, curling, re-drying, cutting, and packaging to become a POD finished color fiber.

[0013] Preferably, a dyeing method in the present invention is further configured as follows: the color paste reaction kettle in step A is made of stainless steel or glass-lined.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the mixing device for the POD stock solution and the color paste in the present invention has a simple structure and is easy to install. By adopting the mixing device in the present invention to mix the POD stock solution and the color paste, the uniformity of the mixing can be greatly improved. By adopting the mixing device and the dyeing method in the present invention to perform front-end dyeing on the POD fiber, the color fastness of the POD fiber color can be greatly improved.

Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the structure of the mixing device of POD stock solution and color paste in the present invention.

[0016] Figure 1In: 1. total fluid delivery flow path, 2. POD stock solution kettle, 20. first air flow path, 21. first air compressor, 22. first valve, 23. POD stock solution flow path, 24. third valve, 3. color paste kettle, 30. second air flow path, 31. second air compressor, 32. second valve, 33. color paste flow path, 34. fourth valve, 35. metering pump, 4. delivery pump, 5. mixing pump, 50. reflux circuit, 51. reflux valve, 6. outlet pressure sensor. [Specific implementation method]

[0017] The following is a further detailed description of a mixing device for POD stock solution and color paste and a dyeing method according to the present invention through specific embodiments.

[0018] See also Figure 1As shown, a mixing device for POD stock solution and color paste includes: a controller (not shown), a fluid delivery main flow path 1, a POD stock solution kettle 2 and a color paste kettle 3, wherein the POD stock solution kettle 2 is connected to a first air compressor 21 through a first air flow path 20, and a first valve 22 is provided on the first air flow path 20. In this embodiment, the first valve 22 is an electromagnetic ball valve. The color paste kettle 3 is connected to a second air compressor 31 through a second air flow path 30, and a second valve 32 is provided on the second air flow path 30. In this embodiment, the second valve 32 is an electromagnetic ball valve. The fluid delivery main flow path 1 is provided with a delivery pump 4, a mixing pump 5 and an outlet pressure sensor 6, and the POD stock solution kettle 2 is connected to the fluid delivery main flow path 1 through a POD stock solution flow path 23, and a third valve 24 is provided on the POD stock solution flow path 23. In this embodiment, the third valve 24 is an electromagnetic ball valve. The color paste kettle 3 is connected to the fluid delivery main flow path 1 through the color paste flow path 33. The color paste flow path 33 is provided with a fourth valve 34 and a metering pump 35. In this embodiment, the fourth valve 34 is an electromagnetic ball valve. The inlet and outlet of the mixing pump 5 are connected with a reflux circuit 50. The reflux circuit 50 is provided with a reflux valve 51. In this embodiment, the reflux valve 51 is an electromagnetic reflux valve. The outlet pressure sensor 6 is arranged at the outlet of the fluid delivery main flow path. The controller is respectively connected to the first valve 22, the second valve 32, the third valve 24, the fourth valve 34, the delivery pump 4, the metering pump 35, the mixing pump 5, the outlet pressure sensor 6, the reflux valve 51, the first air compressor 21 and the second air compressor 31. The controller may include a microprocessor (MCU), which may include a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), a timing module, a digital analog conversion module (A / D converter), and a plurality of input / output ports. Of course, the controller may also use other forms of integrated circuits, such as: Application Specific Integrated Circuit (ASIC) or Field Programmable Gate Array (FPGA), etc. In this embodiment, the controller is a PLC controller.

[0019] The working principle of the mixing device of POD stock solution and color paste in the present invention is as follows: the controller controls the first valve 22 on the first air flow path 20 to open, and then the compressed air is introduced into the POD stock solution kettle 2, and then the controller controls the third valve 24 on the POD stock solution flow path 23 to open, and the POD stock solution is transported to the delivery pump 4, and is pressurized and transported by the delivery pump 4. Similarly, the controller controls the second valve 32 on the second air flow path 30 to open, and then the compressed air is introduced into the color paste kettle 3, and then the controller controls the fourth valve 34 on the color paste flow path 33 to open and the metering pump 35 to work, and the color paste enters the fluid delivery main flow path 1 after passing through the metering pump 35, and then merges with the POD stock solution and is input to the mixing pump 5 behind, and is mixed. The mixing pump 5 mixes the POD stock solution and the color paste. The speed of the mixing pump 5 is controlled by the outlet pressure sensor 6. The pressure value detected by the outlet pressure sensor 6 is transmitted to the controller and compared with the set value. When it is higher than the set value, the controller controls the return valve 51 to open larger and controls the speed of the mixing pump 5 to be higher. When it is lower than the set value, the controller controls the return valve 51 to open smaller and controls the speed of the mixing pump 5 to be lower. The advantages of this design are: 1. The speed of the mixing pump 5 can be automatically adjusted according to the pressure value at the outlet of the fluid conveying total flow path 1; 2. The fluid in the fluid conveying total flow path 1 can always be kept within a suitable pressure range, which can ensure the accuracy of the metering pump. In addition, the reason why compressed air is added to convey the POD stock solution and the color paste in the present invention is mainly because the viscosity of the two materials, the POD stock solution and the color paste, is relatively large. If compressed air is not added for conveying, the material flow will be too slow and the supply will be insufficient.

[0020] A dyeing method comprises the following steps: A. preparing color paste: firstly adding concentrated sulfuric acid into a high-speed shear emulsifier, and then adding solid pigment into the high-speed shear emulsifier, wherein the mass percentage of the concentrated sulfuric acid to the solid color is 80:20-95:5, and after being emulsified by the high-speed shear emulsifier for 30-60 minutes, a uniform color paste is formed, and the color paste is transported to a color paste reactor with a stirrer, and the stirring is continued for 1-2 hours, and then the color paste reactor is left to stand for degassing. In this embodiment, the material of the color paste reactor is stainless steel or glass lining; B. mixing: introducing compressed air into the color paste reactor to pressurize the color paste reactor to a pressure of 0.4-0.6Mpa, opening the fourth valve on the color paste flow path, the color paste enters the metering pump for metering, and then is sent to the total fluid delivery flow path, and similarly introducing compressed air into the POD stock solution kettle to pressurize the POD stock solution kettle to a pressure of 0.4-0.6Mpa, opening the third valve on the POD stock solution flow path, and the POD stock solution is sent to the fluid In the total conveying flow path, the POD stock solution and the color paste that then enter the total fluid conveying flow path enter the mixing pump together for stirring and mixing and are conveyed to the outside of the mixing pump; C, external circulation: Since the flow rate of the mixed material of the POD stock solution and the color paste that comes out of the mixing pump is much larger than the flow rate required for the subsequent spinning, a reflux loop is set at the inlet and outlet of the mixing pump so that the mixed material of the POD stock solution and the color paste re-enters the mixing pump through the reflux loop for mixing, so that the flow rate of the mixed material of the POD stock solution and the color paste at the outlet of the total fluid conveying flow path is adapted to the flow rate required for the subsequent spinning; D, spinning: The mixed material of the POD stock solution and the color paste is conveyed to the spinning metering pump through a pipeline, and enters the spinneret for spinning after precise metering; E, coagulation and washing: After the spinning stock solution is ejected from the spinneret, it enters a coagulation bath composed of dilute sulfuric acid for coagulation, and then undergoes processes such as drawing, neutralization, washing, drying, shaping, oiling, curling, re-drying, cutting, and packaging to become a POD finished color fiber.

[0021] In summary, the mixing device of the POD stock solution and the color paste in the present invention has a simple structure and is easy to install. By using the mixing device in the present invention to mix the POD stock solution and the color paste, the uniformity of the mixing can be greatly improved. Please refer to the following table, which is a comparison chart of the light fastness of colored POD fibers produced by the back-end dyeing (high temperature and high pressure disperse dyeing) process in the prior art and the front-end dyeing (stock solution dyeing) process in the present invention:

[0022]

[0023] It can be seen from the above table that the color fastness of POD fiber can be greatly improved by adopting the mixing device and dyeing method of the present invention to perform pre-dyeing on POD fiber.

[0024] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A mixing device for POD stock solution and color paste, characterized in that: include: A controller, a total fluid delivery flow path, a POD stock liquid kettle and a color paste kettle, the POD stock liquid kettle is connected to a first air compressor through a first air flow path, a first valve is provided on the first air flow path, the color paste kettle is connected to a second air compressor through a second air flow path, a second valve is provided on the second air flow path, a delivery pump, a mixing pump and an outlet pressure sensor are provided on the total fluid delivery flow path, the POD stock liquid kettle is connected to the total fluid delivery flow path through the POD stock liquid flow path, a third valve is provided on the POD stock liquid flow path, the color paste kettle is connected to the total fluid delivery flow path through the color paste flow path, a fourth valve and a metering pump are provided on the color paste flow path, a reflux circuit is connected between the inlet and outlet of the mixing pump, a reflux valve is provided on the reflux circuit, the outlet pressure sensor is arranged at the outlet of the total fluid delivery flow path, and the controller is respectively connected to the first valve, the second valve, the third valve, the fourth valve, the delivery pump, the metering pump, the mixing pump, the outlet pressure sensor, the reflux valve, the first air compressor and the second air compressor.

2. A device for mixing POD stock solution and color paste as claimed in claim 1, characterized in that: The first valve is an electromagnetic ball valve.

3. The device for mixing POD stock solution and color paste according to claim 1, characterized in that: The second valve is a solenoid ball valve.

4. The device for mixing POD stock solution and color paste according to claim 1, characterized in that: The third valve is an electromagnetic ball valve.

5. The device for mixing POD stock solution and color paste according to claim 1, characterized in that: The fourth valve is an electromagnetic ball valve.

6. The device for mixing POD stock solution and color paste according to claim 1, characterized in that: The reflux valve is an electromagnetic reflux valve.

7. The device for mixing POD stock solution and color paste according to claim 1, characterized in that: The controller is a PLC controller.

8. A dyeing method based on the mixing device of POD stock solution and color paste according to any one of claims 1 to 7, comprising the following steps: A. Preparation of color paste: first add concentrated sulfuric acid into a high-speed shear emulsifier, then add solid pigment into the high-speed shear emulsifier, the mass percentage of concentrated sulfuric acid to solid color is 80:20-95:5, after emulsification in the high-speed shear emulsifier for 30-60 minutes, a uniform color paste is formed, the color paste is transported to a color paste reactor with a stirrer, continued to stir for 1-2 hours, and then allowed to stand for degassing; B. Mixing: Pass compressed air into the color paste kettle to pressurize the color paste reactor to a pressure of 0.4-0.6Mpa, open the fourth valve on the color paste flow path, the color paste enters the metering pump for metering, and then is sent to the fluid delivery main flow path. Similarly, pass compressed air into the POD stock solution kettle to pressurize the POD stock solution kettle to a pressure of 0.4-0.6Mpa, open the third valve on the POD stock solution flow path, the POD stock solution is sent to the fluid delivery main flow path, and then the POD stock solution entering the fluid delivery main flow path enters the mixing pump together with the color paste for stirring and mixing and is delivered to the outside of the mixing pump; C. External circulation: Since the flow rate of the mixture of POD stock solution and color paste from the mixing pump is much larger than the flow rate required for the subsequent spinning, a reflux loop is set at the inlet and outlet of the mixing pump so that the mixture of POD stock solution and color paste can re-enter the mixing pump through the reflux loop for mixing, so that the flow rate of the mixture of POD stock solution and color paste at the outlet of the total fluid transport flow path is adapted to the flow rate required for the subsequent spinning; D. Spinning: The mixture of POD stock solution and color paste is transported to the spinning metering pump through a pipeline, and after precise metering, it enters the spinneret for spinning; E. Coagulation and washing: After being ejected from the spinneret, the spinning solution enters a coagulation bath composed of dilute sulfuric acid for coagulation, and then goes through processes such as drawing, neutralization, washing, drying, shaping, oiling, curling, re-drying, cutting, and packaging to become POD finished colored fiber.

9. A dyeing method as claimed in claim 8, characterized in that: The color paste reaction kettle in step A is made of stainless steel or glass-lined.

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