Tear gas and preparation method thereof

Abstract

The invention discloses a tear gas and a preparation method, which solves the technical problem that the tear gas prepared in the prior art will have obvious flocs when the ambient temperature is 4°C to 5°C, and as the temperature gradually decreases, the flocs in the tear gas solution will increase, and the environmental adaptation temperature of the tear gas is unqualified. The tear gas comprises the following raw materials in percentage by mass: 1,2-propylene glycol is 50% to 60%; Tween 20 is 5% to 6%; anhydrous ethanol is 3.5% to 4.5%; capsaicin is 1.5% to 2%; and distilled water is the balance. The tear gas obtained by the invention meets the appearance requirements that the tear gas solution in the tank should be uniform, without obvious oily matter and flocs, and also meets the requirement that no flocs will appear within the ambient temperature of ‑30°C to 55°C. The appearance and environmental adaptation temperature of the tear gas are both qualified.

Description

Technical Field

[0001] The invention relates to the technical field of riot control equipment, and in particular to a tear gas and a preparation method thereof. Background Art

[0002] The formula of the tear gas used in the prior art is the formula specified in Article 5.9 of the GA884-2018 "Public Security Single Police Equipment Tear Gas Sprayer" standard, and the content of synthetic capsaicin is 1.5-2% (mass percentage). The specific formula of the tear gas is (by volume percentage): ethylene glycol is 45%-55%; 1,2-propylene glycol is 22.5%-27.5%; Tween 20 is 4.5%-5.5%; anhydrous ethanol is 4.5%-5.5%; capsaicin is 1.41%-1.9%; and distilled water is the balance. The preparation method is: S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain capsaicin stock solution; S2. The capsaicin stock solution is added to a liquid preparation tank, and then ethylene glycol, 1,2-propylene glycol, Tween 20 and distilled water are added to the liquid preparation tank and stirred evenly, and the stirring is carried out at a stirring speed of 1300 rpm for 90 minutes to obtain a mixed solution; S3. The mixed solution is sealed and allowed to stand for 7 days to obtain a tear gas solution; 10-15 kg of tear gas solution in the liquid preparation tank is extracted, and after the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection are all qualified, it enters the product filling.

[0003] The requirements for tear gas in 5.2.5 of the GA884-2018 "Tear Gas Sprayers for Single Police Officers" standard are as follows: ① "The tear gas solution in the tank should be uniform, without obvious oily matter or flocs"; ② The product environment adaptability temperature is -30℃~55℃.

[0004] However, the tear gas prepared with the above formula will show obvious flocs when the ambient temperature is 4℃~5℃. As the temperature gradually decreases, the flocs in the tear gas solution will become more and more. Therefore, the product often fails the inspection when it is delivered. This is a problem faced by the entire tear gas preparation industry.

[0005] The applicant has found that the prior art has at least the following technical problems:

[0006] The tear gas solution prepared in the prior art will have obvious floccules when the ambient temperature is 4°C to 5°C. As the temperature gradually decreases, the flocs in the tear gas solution will increase, and the tear gas solution is not able to adapt to the ambient temperature. Summary of the invention

[0007] The purpose of the present invention is to provide a tear gas solution and a preparation method thereof, so as to solve the technical problem that the tear gas solution prepared in the prior art will have obvious floccules when the ambient temperature is 4°C to 5°C, and as the temperature gradually decreases, the flocs in the tear gas solution will increase, and the environmental adaptation temperature of the tear gas solution is unqualified.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The invention provides a tear gas solution, which comprises the following raw materials in percentage by mass: 50% to 60% of 1,2-propylene glycol; 5% to 6% of Tween 20; 3.5% to 4.5% of anhydrous ethanol; 1.5% to 2% of capsaicin; and the balance is distilled water.

[0010] Furthermore, the mass percentages of the raw materials are: 52% to 58% of 1,2-propylene glycol; 5.2% to 5.8% of Tween 20; 3.8% to 4.2% of anhydrous ethanol; 1.5% to 1.8% of capsaicin; and the balance is distilled water.

[0011] Furthermore, the mass percentages of the raw materials are: 56.4% of 1,2-propylene glycol; 5.5% of Tween 20; 3.9% of anhydrous ethanol; 1.6% of capsaicin; and 32.6% of distilled water.

[0012] The preparation method of the tear gas provided by the present invention comprises the following steps:

[0013] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0014] S2, adding the capsaicin stock solution into a liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly to obtain a mixed solution;

[0015] S3, sealing the mixed solution and letting it stand for 6 to 8 days to obtain a finished tear gas solution.

[0016] Furthermore, steps S1, S2 and S3 are all performed at an ambient temperature of 28-32°C.

[0017] Furthermore, steps S1, S2 and S3 are all performed at an ambient temperature of 29-31°C.

[0018] Furthermore, in step S2, the stirring is carried out at a stirring speed of 1200 to 1400 rpm for 80 to 100 min.

[0019] Furthermore, in step S2, the stirring is carried out at a stirring speed of 1300 rpm for 90 minutes.

[0020] Furthermore, in step S3, the sealed and standing time is 7 days.

[0021] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0022] The tear gas solution and preparation method provided by the present invention can satisfy the appearance requirements of the tear gas solution in the tank being uniform, free of obvious oily matter and floccules, and can also satisfy the requirement that floccules will not appear within an ambient temperature of -30°C to 55°C. The tear gas solution has both qualified appearance and environmental adaptability temperature. DETAILED DESCRIPTION

[0023] 1. Preparation Example:

[0024] Embodiment 1:

[0025] Preparation of tear gas:

[0026] 1.1 Raw materials:

[0027] The composition comprises, by mass percentage, 56.4% of 1,2-propylene glycol, 5.5% of Tween 20, 3.9% of anhydrous ethanol, 1.6% of capsaicin and 32.6% of distilled water.

[0028] 1.2 Preparation method (carried out at an ambient temperature of 30°C)

[0029] The steps include:

[0030] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0031] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1300 rpm for 90 minutes to obtain a mixed solution;

[0032] S3. Seal the mixed liquid and let it stand for 7 days to obtain tear gas liquid; extract 10-15 kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0033] Embodiment 2:

[0034] Preparation of tear gas:

[0035] 2.1 Raw materials:

[0036] The composition comprises, by mass percentage, 50% of 1,2-propylene glycol, 6% of Tween 20, 4.5% of anhydrous ethanol, 1.5% of capsaicin and 38% of distilled water.

[0037] 2.2 Preparation method (carried out at an ambient temperature of 32°C)

[0038] The steps include:

[0039] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0040] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1200 rpm for 100 min to obtain a mixed solution;

[0041] S3. Seal the mixed liquid and let it stand for 6 days to obtain the finished tear gas liquid; extract 10-15 kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0042] Embodiment 3:

[0043] Preparation of tear gas:

[0044] 3.1 Raw materials:

[0045] The composition comprises, by mass percentage, 60% of 1,2-propylene glycol, 5% of Tween 20, 4.5% of anhydrous ethanol, 2% of capsaicin and 28.5% of distilled water.

[0046] 3.2 Preparation method (carried out at an ambient temperature of 28°C)

[0047] The steps include:

[0048] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0049] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1400 rpm for 80 min to obtain a mixed solution;

[0050] S3. Seal the mixed liquid and let it stand for 8 days to obtain the finished tear gas liquid; extract 10-15 kg of tear gas liquid from the middle section of the liquid preparation tank, and after the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection are qualified, enter the product filling.

[0051] Embodiment 4:

[0052] Preparation of tear gas:

[0053] 4.1 Raw materials:

[0054] The composition comprises, by mass percentage, 58% of 1,2-propylene glycol, 5.8% of Tween 20, 3.8% of anhydrous ethanol, 1.6% of capsaicin and 30.9% of distilled water.

[0055] 4.2 Preparation method (carried out at an ambient temperature of 29°C)

[0056] The steps include:

[0057] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0058] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1350 rpm for 85 minutes to obtain a mixed solution;

[0059] S3. Seal the mixed liquid and let it stand for 7.5 days to obtain the finished tear gas liquid; extract 10-15 kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0060] Embodiment 5:

[0061] Preparation of tear gas:

[0062] 5.1 Raw materials:

[0063] The composition comprises, by mass percentage, 52% of 1,2-propylene glycol, 5.2% of Tween 20, 4.2% of anhydrous ethanol, 1.8% of capsaicin and 36.8% of distilled water.

[0064] 5.2 Preparation method (carried out at an ambient temperature of 31°C)

[0065] The steps include:

[0066] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0067] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1250 rpm for 95 minutes to obtain a mixed solution;

[0068] S3. Seal the mixed liquid and let it stand for 6.5 days to obtain the finished tear gas liquid; extract 10-15 kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0069] Embodiment 6:

[0070] Preparation of tear gas:

[0071] 6.1 Raw materials:

[0072] The composition comprises, by mass percentage, 56.4% of 1,2-propylene glycol, 5.5% of Tween 20, 3.9% of anhydrous ethanol, 1.6% of capsaicin and 32.6% of distilled water.

[0073] 6.2 Preparation method (carried out at an ambient temperature of 32°C)

[0074] The steps include:

[0075] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0076] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1400 rpm for 80 min to obtain a mixed solution;

[0077] S3. Seal the mixed liquid and let it stand for 6 days to obtain the finished tear gas liquid; extract 10-15 kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0078] Embodiment 7:

[0079] Preparation of tear gas:

[0080] 7.1 Raw materials:

[0081] The composition comprises, by mass percentage, 60% of 1,2-propylene glycol, 6% of Tween 20, 4.5% of anhydrous ethanol, 2% of capsaicin and 27.5% of distilled water.

[0082] 7.2 Preparation method (carried out at an ambient temperature of 29°C)

[0083] The steps include:

[0084] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0085] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 30 rpm for 90 minutes to obtain a mixed solution;

[0086] S3. Seal the mixed liquid and let it stand for 7 days to obtain the finished tear gas liquid; extract 10-15kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0087] Embodiment 8:

[0088] Preparation of tear gas:

[0089] 8.1 Raw materials:

[0090] The composition comprises, by mass percentage, 50% of 1,2-propylene glycol, 5% of Tween 20, 4.5% of anhydrous ethanol, 1.5% of capsaicin and 39% of distilled water.

[0091] 8.2 Preparation method (carried out at an ambient temperature of 29°C)

[0092] The steps include:

[0093] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0094] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1400 rpm for 100 min to obtain a mixed solution;

[0095] S3. Seal the mixed liquid and let it stand for 7 days to obtain the finished tear gas liquid; extract 10-15kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0096] Embodiment 9:

[0097] Preparation of tear gas:

[0098] 9.1 Raw materials:

[0099] The composition comprises, by mass percentage, 52% of 1,2-propylene glycol, 5.2% of Tween 20, 4.2% of anhydrous ethanol, 1.7% of capsaicin and 36.9% of distilled water.

[0100] 9.2 Preparation method (carried out at an ambient temperature of 31°C)

[0101] The steps include:

[0102] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0103] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1200 rpm for 100 min to obtain a mixed solution;

[0104] S3. Seal the mixed liquid and let it stand for 7 days to obtain the finished tear gas liquid; extract 10-15kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0105] Embodiment 10:

[0106] Preparation of tear gas:

[0107] 10.1 Raw materials:

[0108] The composition comprises, by mass percentage, 58% of 1,2-propylene glycol, 5.2% of Tween 20, 4.2% of anhydrous ethanol, 1.6% of capsaicin and 31% of distilled water.

[0109] 10.2 Preparation method (carried out at an ambient temperature of 30°C)

[0110] The steps include:

[0111] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0112] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1300 rpm for 90 minutes to obtain a mixed solution;

[0113] S3. Seal the mixed liquid and let it stand for 7 days to obtain the finished tear gas liquid; extract 10-15kg of tear gas liquid from the middle section of the liquid preparation tank, and after passing the appearance inspection, gradient low temperature adaptability inspection, and tear gas component inspection, enter the product filling.

[0114] 2. Comparison

[0115] Comparative Example 1:

[0116] 1.1 Raw materials

[0117] By mass percentage: ethylene glycol is 52.54%; 1,2-propylene glycol is 24.56%; Tween 20 is 4.78%; anhydrous ethanol is 3.74%; capsaicin is 1.7%; distilled water is 12.68%)

[0118] 1.2 Preparation method (carried out at an ambient temperature of 30°C)

[0119] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0120] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding ethylene glycol, 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1300 rpm for 90 minutes to obtain a mixed solution;

[0121] S3, sealing the mixed solution and letting it stand for 7 days to obtain a finished tear gas solution.

[0122] Comparative Example 2:

[0123] 2.1 Raw materials

[0124] The composition includes, by mass percentage, 57.47% ethylene glycol, 26.38% 1,2-propylene glycol, 5.23% Tween 20, 4.09% anhydrous ethanol, 2% capsaicin and 4.66% distilled water.

[0125] 2.2 Preparation method

[0126] The same preparation method as in Comparative Example 1.

[0127] Comparative Example 3:

[0128] 3.1 Raw materials

[0129] The composition includes, by mass percentage, 47.53% ethylene glycol, 22.72% 1,2-propylene glycol, 4.32% Tween 20, 3.38% anhydrous ethanol, 1.5% capsaicin and 20.54% distilled water.

[0130] 3.2 Preparation method

[0131] The same preparation method as in Comparative Example 1.

[0132] Comparative Example 4:

[0133] 4.1 Raw materials

[0134] The composition includes, by mass percentage, ethylene glycol: 43.24%; 1,2-propylene glycol: 40.44%; Tween 20: 4.32%; anhydrous ethanol: 3.75%; capsaicin: 1.55%; and distilled water: 6.69%.

[0135] 4.2 Preparation method

[0136] The same preparation method as in Comparative Example 1.

[0137] Comparative Example 5:

[0138] 5.1 Raw materials

[0139] The composition includes, by mass percentage, 58.02% ethylene glycol, 0% 1,2-propylene glycol, 4.32% Tween 20, 3.75% anhydrous ethanol, 1.55% capsaicin and 32.35% distilled water.

[0140] 5.2 Preparation method

[0141] S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution;

[0142] S2, adding the capsaicin stock solution into the liquid preparation tank, and then adding ethylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly, stirring is carried out at a stirring speed of 1300 rpm for 90 min to obtain a mixed solution;

[0143] S3, sealing the mixed solution and letting it stand for 7 days to obtain a finished tear gas solution.

[0144] 3. Experimental Examples

[0145] 1. Detection of the appearance of the tear gas prepared in Examples 1 to 10 and Comparative Examples 1 to 5

[0146] (1) Detection method:

[0147] The tear gas solutions obtained in the above embodiments and comparative examples were respectively filled into transparent sealed containers, each bottle was 70 ml, and 5 bottles were filled for each embodiment and comparative example, and placed in a low temperature test box at the same time. The low temperature test box was set to a constant temperature of -5°C ± 2°C, and light was observed once every 4 hours to see if there was any floccules. The total duration of the experiment was 72 hours.

[0148] (2) The test results are shown in Table 1 below:

[0149] Table 1 Tear gas appearance test results

[0150] Appearance Example 1 No flocs appear in 72 hours Example 2 No flocs appear in 72 hours Example 3 No flocs appear in 72 hours Example 4 No flocs appear in 72 hours Example 5 No flocs appear in 72 hours Example 6 No flocs appear in 72 hours Example 7 No flocs appear in 72 hours Example 8 No flocs appear in 72 hours Example 9 No flocs appear in 72 hours Example 10 No flocs appear in 72 hours Comparative Example 1 Floccules appear after 20 hours Comparative Example 2 Floccules appear after 20 hours Comparative Example 3 Floccules appear after 20 hours Comparative Example 4 Floccules appear after 20 hours Comparative Example 5 Floccules appear after 20 hours

[0151] It can be seen from Table 1 that in Comparative Examples 1-5, flocs appeared at the 20th hour of observation, while in Examples 1-10 of the present application, no flocs appeared in the tear gas within 72 hours; it can be seen that ethylene glycol is the root cause of the generation of flocs in the tear gas under low temperature conditions, while the tear gas without ethylene glycol did not produce flocs under the same low temperature conditions; after the tear gas that produced flocs was placed in an oven and heated to 5°C and kept at a constant temperature for 4 hours, the flocs gradually disappeared.

[0152] 2. The tear gas solutions prepared in Examples 1 to 10 and Comparative Examples 1 to 5 were subjected to a gradient low temperature adaptability test.

[0153] (1) Detection method:

[0154] The tear gas obtained in the above embodiment and comparative example were filled into transparent sealed containers, 70 ml per bottle, 30 bottles were filled, and six low-temperature test boxes were placed at the same time (according to the tear gas in the same embodiment and comparative example, 5 bottles were placed in one low-temperature test box). The six low-temperature test boxes were set to constant temperatures of 0°C, -5°C, -10°C, -15°C, -20°C, -25°C, and -30°C, respectively. The light was observed once every 4 hours to see if there was any floccules. The total experimental time was 72 hours.

[0155] (2) Test results are shown in Table 2 below:

[0156] Table 2 Gradient low temperature adaptability test results

[0157]

[0158] It can be seen from Table 2 that the tear gas solutions in Comparative Examples 1-5 all had flocs within 20 hours at the detection temperature (0°C, -5°C, -10°C, -15°C, -20°C and -30°C), while the tear gas solutions in Examples 1-10 of the present application had no flocs within 72 hours at the detection temperature (0°C, -5°C, -10°C, -15°C, -20°C and -30°C); this indicates that the tear gas solution prepared with ethylene glycol has no flocs under various low temperature conditions, which meets the requirements of GA884-2018 standard 5.2.5 "the tear gas solution in the tank should be uniform, without obvious oil and flocs".

[0159] 3. Detection of tear gas components in the tear gas solutions prepared in Examples 1 to 10 and Comparative Examples 1 to 5

[0160] (1) Detection method

[0161] Testing equipment used: High performance liquid chromatograph, gas chromatograph (Tween 20 only for qualitative analysis).

[0162] (2) Test results are shown in Table 3 below:

[0163] Table 3 Tear-inducing component detection results (mass %)

[0164] Capsaicin Ethylene glycol 1,2-Propanol Twain 20 Ethanol Example 1 1.59 0 56.42 Qualitative analysis exists 3.95 Example 2 1.5 0 50.03 Qualitative analysis exists 4.51 Example 3 1.97 0 60 Qualitative analysis exists 4.49 Example 4 1.61 0 58.02 Qualitative analysis exists 3.82 Example 5 1.82 0 52.04 Qualitative analysis exists 4.21 Example 6 1.61 0 56.43 Qualitative analysis exists 3.9 Example 7 1.98 0 59.98 Qualitative analysis exists 4.49 Example 8 1.51 0 50.01 Qualitative analysis exists 4.51 Example 9 1.69 0 52.03 Qualitative analysis exists 4.22 Example 10 16.1 0 57.97 Qualitative analysis exists 4.18 Comparative Example 1 1.7 50.18 25.02 Qualitative analysis exists 4.97 Comparative Example 2 1.97 54.97 27.01 Qualitative analysis exists 5.51 Comparative Example 3 1.52 45.06 22.97 Qualitative analysis exists 4.53 Comparative Example 4 1.56 41.03 41.04 Qualitative analysis exists 4.98 Comparative Example 5 1.56 54.96 0 Qualitative analysis exists 4.97

[0165] It can be seen from Table 3 that the presence or absence of ethylene glycol in the tear gas formula has no effect on the dissolution effect of capsaicin. The tear-inducing component of the tear gas is capsaicin, and the role of ethylene glycol and 1,2-propanol is to act as antifreeze. However, the tear gas with ethylene glycol will produce flocs at low temperatures, resulting in the tear gas failing the appearance inspection.

Claims

1. A tear gas, characterized in that: The invention comprises the following raw materials in mass percentage: 50% to 60% of 1,2-propylene glycol; 5% to 6% of Tween 20; 3.5% to 4.5% of anhydrous ethanol; 1.5% to 2% of capsaicin; and the balance is distilled water; the tear gas is suitable for an ambient temperature of -30 to 0°C; The tear gas is prepared by the following steps: S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution; S2, adding the capsaicin stock solution into a liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly to obtain a mixed solution; S3, sealing the mixed solution and letting it stand for 6 to 8 days to obtain a finished tear gas solution.

2. The tear gas according to claim 1, characterized in that The mass percentages of the raw materials are as follows: 52% to 58% of 1,2-propylene glycol; 5.2% to 5.8% of Tween 20; 3.8% to 4.2% of anhydrous ethanol; 1.5% to 1.8% of capsaicin; and the balance is distilled water.

3. The tear gas according to claim 1, characterized in that: The mass percentages of the raw materials are as follows: 56.4% of 1,2-propylene glycol; 5.5% of Tween 20; 3.9% of anhydrous ethanol; 1.6% of capsaicin; and 32.6% of distilled water.

4. The method for preparing the tear gas according to any one of claims 1 to 3, characterized in that: The steps include: S1. First, capsaicin and anhydrous ethanol are mixed evenly to obtain a capsaicin stock solution; S2, adding the capsaicin stock solution into a liquid preparation tank, and then adding 1,2-propylene glycol, Tween 20 and distilled water into the liquid preparation tank and stirring evenly to obtain a mixed solution; S3, sealing the mixed solution and letting it stand for 6 to 8 days to obtain a finished tear gas solution.

5. The method for preparing tear gas according to claim 4, characterized in that: The steps S1, S2 and S3 are all performed at an ambient temperature of 28-32°C.

6. The method for preparing tear gas according to claim 4, characterized in that: The steps S1, S2 and S3 are all performed at an ambient temperature of 29-31°C.

7. The method for preparing tear gas according to claim 4, characterized in that: In step S2, stirring is carried out at a stirring speed of 1200 to 1400 rpm for 80 to 100 min.

8. The method for preparing tear gas according to claim 4, characterized in that: In step S2, stirring is carried out at a stirring speed of 1300 rpm for 90 minutes.

9. The method for preparing tear gas according to claim 4, characterized in that: In step S3, the sealed and standing time is 7 days.

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