Preparation process of mixed ester double-base blank absorption medicine containing TG and NG

Abstract

The invention discloses a preparation process of a mixed ester double-base blank absorption drug containing TG and NG, and relates to the technical field of preparation of mixed ester double-base blank absorption drugs. The preparation process comprises the following steps: synthesizing nitroglycerin NG; preparing cotton pulp containing NC (nitrocellulose) and centralite; adding NG into the cotton pulp to prepare a mixed solution containing NG and NC, and stirring; the method comprises the following steps: synthesizing nitrified triethylene glycol TG, adding TG into a mixed solution containing NG and NC, and stirring; and centrifuging the stirred mixed solution, and removing most of water to obtain the mixed ester double-base blank absorption medicine containing TG and NG. On the basis of a conventional common double-base propellant, new TG is added, the dangerousness of NG and TG is reduced through an absorption process, and meanwhile, the consistency of components of the propellant can be more accurately controlled in the reverse absorption process by analyzing the components of a blank absorption drug.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of mixed ester double-base blank absorption medicine, in particular to a preparation process of mixed ester double-base blank absorption medicine containing TG and NG. Background Art

[0002] The preparation process of extrusion molding double-base propellant mainly includes absorption, calendering, molding and post-processing. The absorption process is divided into primary absorption and reverse absorption. Reverse absorption refers to the process of first preparing nitrate ester and nitrocellulose into blank absorption medicine containing nitrate ester to reduce its danger, and then absorbing the blank absorption medicine with other components of the propellant.

[0003] The blank absorption medicine containing NG is prepared by synthesizing NG and NC, and the blank absorption medicine containing TG is prepared by synthesizing TG and NC. However, if one wants to prepare a mixed ester propellant containing TG and NG, it is difficult to prepare because NG and TG are very dangerous when they exist alone, and the production line cannot produce TG and NG at the same time. Based on this, a preparation process of a mixed ester double-base blank absorption medicine containing TG and NG is designed to prepare a mixed ester blank absorption medicine containing TG and NG, and then back-absorption is performed to obtain a mixed ester propellant containing TG and NG, which can greatly improve the safety of the absorption process and the accuracy of the propellant component dosage. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a preparation process of a mixed ester double-base blank absorbent containing TG and NG. On the basis of the previous ordinary double-base propellant, new TG is added to reduce the danger of NG and TG through the absorption process. At the same time, by analyzing the components of the blank absorbent, the consistency of the propellant components can be more accurately controlled during the reverse absorption process.

[0005] The object of the present invention is achieved through the following technical scheme: a preparation process of a mixed ester double-base blank absorption drug containing TG and NG, the process comprising the following steps:

[0006] S1. Synthesize nitroglycerin NG.

[0007] S2. Prepare cotton pulp containing nitrocellulose NC and neutralizer.

[0008] S3. Add NG to cotton pulp to prepare a mixed solution containing NG and NC, and stir.

[0009] S4. Synthesize nitrated triethylene glycol TG, add TG into the mixed solution containing NG and NC, and stir.

[0010] S5. Centrifuge the stirred mixture to remove most of the water to obtain a mixed ester dibasic blank absorption drug containing TG and NG.

[0011] In the step S2, the content of the neutralizing agent is not more than 5%.

[0012] In the step S3, the content of the nitroglycerin NG is not greater than 50%.

[0013] The stirring time is not less than 1h, and the stirring temperature is 30℃~70℃.

[0014] In the step S4, the content of the nitrated triethylene glycol TG is not greater than 50%.

[0015] The stirring time should not be less than 1h, and the stirring temperature should be 30℃~70℃. If the temperature is too low, nitroglycerin NG will crystallize below 13℃ and become explosive. If the temperature is too high, the mixture will evaporate and decompose. At the same time, the content of nitroglycerin NG and nitrotriethylene glycol TG in the mixture should not be too high, otherwise NC cannot be absorbed.

[0016] In step S5, since the water temperature is too high during centrifugation, it is difficult to operate and burns may occur easily. Therefore, the centrifugal temperature of the stirred mixed solution is not higher than 35° C., and the water content of the mixed ester dibase blank absorbent after centrifugation is not higher than 30%.

[0017] The beneficial effects of the present invention are:

[0018] 1. Commonly used ordinary double-base propellants are mainly NC and NG. Pure NG is relatively dangerous. Its danger is reduced by absorbing NC. Pure NG cannot be transported, but it is allowed to be transported after absorbing NC. The present invention adds new TG on the basis of the conventional ordinary double-base propellants.

[0019] 2. The present invention prepares a mixed ester double-base blank absorbent containing TG and NG, mainly to reduce the danger of NG and TG through the absorption process. At the same time, by analyzing the components of the blank absorbent, the consistency of the propellant components can be more accurately controlled during the reverse absorption process. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The present invention will be further described below in conjunction with specific embodiments.

[0022] In one embodiment of the present application:

[0023] A preparation process of a mixed ester double-base blank absorption drug containing TG and NG, the process comprising the following steps:

[0024] S1. Synthesize nitroglycerin NG.

[0025] S2. Prepare cotton pulp containing nitrocellulose NC and a neutralizing agent, wherein the content of the neutralizing agent is not more than 5%, and the neutralizing agent is 2# neutralizing agent (i.e., dimethyl diphenylurea C 15 H 16 N2O) to ensure the stability of the mixed ester double-base blank absorbent for a long time; the neutralizer in this step can also be added in step S3 or step S4, that is, first prepare cotton pulp containing NC, then add NG and the neutralizer to the cotton pulp, prepare a mixed solution containing NG and NC, and stir, or, first prepare cotton pulp containing NC, then add NG to the cotton pulp, prepare a mixed solution containing NG and NC, and stir, synthesize nitrated triethylene glycol TG, and add TG and the neutralizer to the mixed solution containing NG and NC, and stir.

[0026] S3. Add NG to cotton pulp to prepare a mixed solution containing NG and NC, and stir. The content of nitroglycerin NG is not more than 50%. The stirring time is not less than 1 hour and the stirring temperature is 30°C to 70°C.

[0027] S4. Synthesize triethylene glycol nitrate TG, add TG to the mixed solution containing NG and NC, and stir. The purpose of stirring is to ensure uniform absorption. The content of triethylene glycol nitrate TG is not more than 50%, the stirring time is not less than 1h, and the stirring temperature is 30℃~70℃. If the temperature is too low, nitroglycerin NG will crystallize below 13℃ and be explosive. If the temperature is too high, the mixed solution will volatilize and decompose. At the same time, the content of nitroglycerin NG and triethylene glycol nitrate TG in the mixed solution cannot be too high, otherwise NC cannot be absorbed.

[0028] S5. Centrifuge the stirred mixture to remove most of the water to obtain a mixed ester dibase blank absorption drug containing TG and NG. The mixed ester dibase blank absorption drug is formed by dissolving NC in TG and NG. Since the water temperature is too high during centrifugation, it is difficult to operate and burns may occur easily. Therefore, the centrifugal temperature of the stirred mixture is not more than 35°C, and the water content of the mixed ester dibase blank absorption drug after centrifugation is not more than 30%.

[0029] In another embodiment of the present application:

[0030] On the basis of the previous embodiment, the synthesis order of nitroglycerin NG and nitrified triethylene glycol TG in this embodiment can be reversed, that is, nitrified triethylene glycol TG is first synthesized, cotton pulp containing NC and a neutralizing agent is prepared, nitrified triethylene glycol TG is added to the cotton pulp to prepare a mixed solution containing TG and NC, and stirred, then nitroglycerin NG is synthesized, and NG is added to the mixed solution containing TG and NC, and stirred, and the stirred mixed solution is centrifuged to drive off most of the water to obtain a mixed ester dibase blank absorption drug containing TG and NG.

[0031] The above is only an embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A preparation process of a mixed ester double-base blank absorption drug containing TG and NG, characterized in that: The following steps are involved: S1, synthesize nitroglycerin NG; S2, preparing cotton pulp containing nitrocellulose NC and a neutralizing agent; S3, adding NG to cotton pulp to prepare a mixed solution containing NG and NC, and stirring; S4, synthesizing nitrated triethylene glycol TG, adding TG to the mixed solution containing NG and NC, and stirring; S5. Centrifuge the stirred mixture to remove most of the water to obtain a mixed ester dibasic blank absorption drug containing TG and NG.

2. The preparation process of a mixed ester double-base blank absorption drug containing TG and NG according to claim 1, characterized in that: In the step S2, the content of the neutralizing agent is not more than 5%.

3. The preparation process of a mixed ester double-base blank absorption drug containing TG and NG according to claim 1, characterized in that: In the step S3, the content of the nitroglycerin NG is not greater than 50%.

4. The preparation process of a mixed ester double-base blank absorption drug containing TG and NG according to claim 3, characterized in that: The stirring time is not less than 1h, and the stirring temperature is 30℃~70℃.

5. The preparation process of a mixed ester double-base blank absorption drug containing TG and NG according to claim 1, characterized in that: In the step S4, the content of the nitrated triethylene glycol TG is not greater than 50%.

6. The preparation process of a mixed ester double-base blank absorption drug containing TG and NG according to claim 5, characterized in that: The stirring time is not less than 1h, and the stirring temperature is 30℃~70℃.

7. The preparation process of a mixed ester double-base blank absorption drug containing TG and NG according to claim 1, characterized in that: In the step S5, the centrifugal temperature of the stirred mixed solution is not greater than 35° C., and the water content of the mixed ester dibase blank absorbent after centrifugation is not greater than 30%.