Nitrocellulose dosing process

Abstract

The application discloses a nitrocellulose feeding process, which comprises the following steps: adding a solvent, pouring the solvent into a stirring kettle; adding an additive, after the solvent is added, the additive is poured into the stirring kettle; feeding nitrocellulose, after the additive is added, the nitrocellulose is gradually fed into the stirring kettle according to the feeding sequence from low to high viscosity, so that the nitrocellulose is soaked in the solvent; pressing the nitrocellulose, the nitrocellulose is pressed downward by using a cotton pressing rod, so that the nitrocellulose is immersed in the solvent; and fully soaking, after the nitrocellulose is pressed, the nitrocellulose is statically soaked in the stirring kettle for more than 30 minutes. The feeding process of the nitrocellulose is optimized, the solvent is first poured into the stirring kettle instead of feeding the nitrocellulose first and then pouring the solvent, the cotton feeding process is slowed down, the nitrocellulose is sequentially fed according to the characteristics of the nitrocellulose, and the step of pressing the nitrocellulose is further added; after the nitrocellulose is completely immersed in the solvent, the method can reduce the risk of nitrocellulose production to the maximum extent and improve the safety of production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nitrocellulose solution processing, in particular to a nitrocellulose feeding process. BACKGROUND

[0002] The characteristics of nitrocellulose are low ignition point, flammable and explosive, which belongs to flammable and explosive hazardous chemicals. If an accident occurs, the consequences and effects will be great. The production and processing of nitrocellulose solution is also a risky process. Therefore, higher requirements are put forward for the process in the production process to regulate the processing flow of nitrocellulose. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a nitrocellulose feeding process, which optimizes the nitrocellulose feeding process, effectively reduces the risk of nitrocellulose solution production, and improves the safety of production operation.

[0004] The nitrocellulose feeding process according to the embodiment of the present application comprises:

[0005] Adding solvent: injecting solvent into the stirring kettle;

[0006] Adding an additive: after adding the solvent, injecting the additive into the stirring kettle;

[0007] Feeding nitrocellulose: after adding the additive, gradually feeding the nitrocellulose into the stirring kettle according to the feeding order from low to high viscosity, so that the nitrocellulose is soaked in the solvent;

[0008] Pressing nitrocellulose: manually using a cotton pressing rod to push down and press the nitrocellulose, so that the nitrocellulose is immersed in the solvent;

[0009] Sufficient soaking: after pressing the nitrocellulose, the nitrocellulose is statically soaked in the stirring kettle for more than 30 minutes.

[0010] The nitrocellulose feeding process according to the embodiment of the present application has at least the following beneficial effects: the feeding process of nitrocellulose is optimized, the solvent is first injected into the stirring kettle, rather than the nitrocellulose is first fed and then the solvent is injected, and the feeding process is slowed down, the nitrocellulose is fed in turn according to its own characteristics, in addition, the step of pressing the nitrocellulose is further increased, and the nitrocellulose can be completely immersed in the solvent before stirring in the stirring kettle. By this method, the risk of nitrocellulose production can be reduced to the maximum extent, and the safety of production can be improved.

[0011] According to the nitrocellulose feeding process, the addition of the solvent and the addition of the additive are both automatically delivered by the delivery pump.

[0012] According to the nitrocellulose feeding process, after adding the solvent, the liquid level of the solvent is manually observed to be stable before adding the additive.

[0013] The nitrocellulose feeding process of the present application adds the solvent and then adds the auxiliary agent at least 3 minutes apart.

[0014] The nitrocellulose feeding process of the present application is made of soft metal.

[0015] The nitrocellulose feeding process of the present application is made of aluminum.

[0016] The nitrocellulose feeding process of the present application is made of aluminum.

[0017] The nitrocellulose feeding process of the present application is made of aluminum.

[0018] The nitrocellulose feeding process of the present application is made of aluminum.

[0019] The nitrocellulose feeding process of the present application further comprises the following step: starting stirring: after soaking, manually observe whether the nitrocellulose is fully immersed in the solvent, and then start the stirring tank to stir the nitrocellulose.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 The nitrocellulose feeding process of the present application is made of soft metal.

[0023] Figure 2 The nitrocellulose feeding process of the present application is made of soft metal.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] S1: adding solvent; S2: adding auxiliary agent; S3: feeding nitrocellulose; S4: pressing nitrocellulose; S5: soaking; S6: starting stirring;

[0026] The nitrocellulose feeding process of the present application is made of soft metal. DETAILED DESCRIPTION

[0027] Embodiments of the present application are described below in the detailed description and illustrated in the accompanying drawings by using examples, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are for the purpose of explaining the present application only, and are not to be understood as a limitation of the present application.

[0028] In the description of the present application, it is to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0030] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0031] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The properties of nitrocellulose are low ignition point, flammable and explosive, which belongs to flammable and explosive hazardous chemicals. If an accident occurs, the consequences and effects will be great. The production and processing process of nitrocellulose liquid is also a risky process. Therefore, higher requirements are put forward for the process in the production process to regulate the processing flow of nitrocellulose.

[0033] Therefore, as shown in Figure 1 and Figure 2 The nitrocellulose feeding process proposed by the present application includes the following steps performed in sequence:

[0034] S1, adding solvent: injecting solvent into the stirred tank;

[0035] S2, adding auxiliary agent: after adding the solvent, injecting the auxiliary agent into the stirred tank;

[0036] S3, putting nitrocellulose: after adding the auxiliary agent, putting the nitrocellulose into the stirred tank according to the order from low to high viscosity, so that the nitrocellulose is soaked in the solvent;

[0037] S4, pressing nitrocellulose: manually using the cotton pressing rod 100 to push down and press the nitrocellulose, so that the nitrocellulose is immersed in the solvent;

[0038] S5, sufficient soaking: after pressing the nitrocellulose, the nitrocellulose is soaked in the stirred tank for more than 30 minutes;

[0039] S6, starting stirring: after soaking, manually observing that the nitrocellulose is completely immersed in the solvent, and starting the stirring tank to stir the nitrocellulose.

[0040] In some embodiments of the present application, both adding the solvent and adding the auxiliary agent are automatically delivered by the delivery pump. It should be noted that according to the production process operation procedure, first instruct the solvent delivery pump on the automatic operation system, the solvent delivery pump delivers the solvent into the stirred tank, after completing the solvent delivery, the auxiliary agent delivery pump is used to add the required auxiliary agent into the stirred tank. In order to ensure the safety of the process, the two solution delivery processes cannot be carried out at the same time, and the solvent is delivered first and then the auxiliary agent is delivered. For example, the solvent is toluene, xylene, or most ester organic solvents. In some embodiments, the solvent is at least one of acetone, glacial acetic acid, methanol, ethyl acetate, amyl acetate, dipropylene glycol dimethyl ether, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate. The common auxiliary agent for nitrocellulose is the anti-yellowing auxiliary agent for nitrocellulose.

[0041] In some embodiments of the present application, after adding the solvent, manually observing the liquid level of the solvent to be stable, and then adding the auxiliary agent, to avoid static electricity generated by the solvent stirring when adding the auxiliary agent.

[0042] In some embodiments of the present application, after adding the solvent, at least 3 minutes are interval before adding the auxiliary agent, to ensure that the solvent is stable before adding the auxiliary agent, and further ensure the independence of the two steps of adding the solvent and adding the auxiliary agent.

[0043] As Figure 2As shown, in some embodiments of the present application, the cotton pressing rod 100 is made of soft metal. It should be noted that different viscosity nitrocellulose is put into the stirred tank according to the production order specified formula, and the order of putting nitrocellulose is gradually put according to the principle of putting low viscosity first and high viscosity later, and the speed of putting nitrocellulose should be controlled not too fast to ensure that all the nitrocellulose put into the stirred tank is soaked in the solvent. If a large amount of nitrocellulose floats on the solvent in the stirred tank and does not sink, manual cotton pressing should be performed using the cotton pressing rod 100. When pressing cotton, it is determined whether to use different types of cotton pressing rod 100 according to the sinking speed of the nitrocellulose, such as when the nitrocellulose stops sinking, the cotton pressing rod 100 is used to push the nitrocellulose under the solvent to ensure that all the nitrocellulose is soaked in the solvent. It should be noted that the cotton pressing rod 100 is made of soft metal and does not produce collision sparks, ensuring the safety of the production process. Preferably, the cotton pressing rod 100 is made of aluminum. Further, the end of the cotton pressing rod 100 is provided with a plurality of pressing plates 110 for pressing nitrocellulose, and the plurality of pressing plates 110 are arranged along the circumference of the cotton pressing rod 100. For example, the pressing plates 110 form a cross structure. It should be noted that the manual cotton pressing rod 100 is pressed by the pressing plates 110 at the front end to press the nitrocellulose floating on the upper layer of the solvent downward, and when the cotton pressing rod 100 is pressed against the nitrocellulose near the stirring tank shaft portion, the cotton pressing rod 100 cannot collide with the stirring tank shaft portion to avoid damaging the cotton pressing rod 100. When pressing the nitrocellulose, the nitrocellulose at the feeding port of the stirred tank is pressed first and then the nitrocellulose in the stirred tank is gradually pressed down.

[0044] Optionally, the nitrocellulose is statically soaked in the stirred tank for 30-50 minutes. Preferably, the nitrocellulose is statically soaked in the stirred tank for 45 minutes, and then the observation window is observed to check whether the nitrocellulose in the stirred tank is fully soaked, and then the nitrocellulose feeding process is completed and the next process is started.

[0045] The above describes the embodiments of the present application in detail in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A process for adding nitrocellulose, characterized in that, Includes the following steps: Adding solvent: Inject solvent into the stirred tank; Adding additives: After adding solvent, inject the additives into the mixing tank at least 3 minutes later; Adding nitrocellulose: After adding the additives, gradually add the nitrocellulose into the mixing tank in order of increasing viscosity, so that the nitrocellulose is immersed in the solvent; Pressing nitrocellulose: The nitrocellulose is manually pressed down using an aluminum pressing rod to immerse it in the solvent. The end of the pressing rod is provided with multiple pressure plates for pressing the nitrocellulose, and the multiple pressure plates are arranged at intervals along the circumference of the pressing rod. Thorough soaking: After pressing the nitrocellulose, let it soak in the stirred tank for at least 30 minutes; Start-up and stirring: After soaking, manually observe that the nitrocellulose is completely submerged in the solvent, then turn on the stirring vessel to stir the nitrocellulose.

2. The nitrocellulose application process according to claim 1, characterized in that: Both the addition of solvents and additives are automatically delivered using a transfer pump.

3. The nitrocellulose application process according to claim 1, characterized in that: After adding the solvent, manually observe that the solvent level is stable before adding the additives.

4. The nitrocellulose application process according to claim 1, characterized in that: The nitrocellulose is allowed to stand and soak in the stirred tank for 30 to 50 minutes.

5. The nitrocellulose application process according to claim 4, characterized in that: The nitrocellulose was allowed to stand and soak in the stirred tank for 45 minutes.

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