CN116271675A - Perfluoro-hexanone microcapsule fire extinguishing medium and preparation method thereof - Google Patents
Perfluoro-hexanone microcapsule fire extinguishing medium and preparation method thereof Download PDFInfo
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- CN116271675A CN116271675A CN202310284414.0A CN202310284414A CN116271675A CN 116271675 A CN116271675 A CN 116271675A CN 202310284414 A CN202310284414 A CN 202310284414A CN 116271675 A CN116271675 A CN 116271675A
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- hexanone
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- 239000003094 microcapsule Substances 0.000 title claims abstract description 31
- WVSNNWIIMPNRDB-UHFFFAOYSA-N 1,1,1,3,3,4,4,5,5,6,6,6-dodecafluorohexan-2-one Chemical compound FC(F)(F)C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F WVSNNWIIMPNRDB-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 9
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000002775 capsule Substances 0.000 claims abstract description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 25
- 239000004323 potassium nitrate Substances 0.000 claims abstract description 25
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 25
- 229920001661 Chitosan Polymers 0.000 claims abstract description 22
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 20
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 20
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 19
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 36
- 239000002245 particle Substances 0.000 claims description 21
- QQZOPKMRPOGIEB-UHFFFAOYSA-N 2-Oxohexane Chemical class CCCCC(C)=O QQZOPKMRPOGIEB-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 230000001804 emulsifying effect Effects 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 3
- 238000004945 emulsification Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 15
- 238000000465 moulding Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 13
- 238000000967 suction filtration Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000012874 anionic emulsifier Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012875 nonionic emulsifier Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0007—Solid extinguishing substances
- A62D1/0021—Microcapsules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dispersion Chemistry (AREA)
- Fire-Extinguishing Compositions (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
The invention discloses a perfluoro-hexanone microcapsule fire extinguishing medium and a preparation method thereof, belonging to the technical field of fire control. The capsule comprises a capsule shell and a capsule core, wherein the mass ratio of the capsule core to the capsule shell is 40-65:30-45, wherein the capsule core comprises perfluoro-hexanone, silicon dioxide and azodiisobutyronitrile, and the mass ratio of the perfluoro-hexanone to the silicon dioxide to the azodiisobutyronitrile is 100:1.0-3.5:0.1-0.3; the capsule shell is prepared from chitosan, acrylic resin, aluminum hydroxide, an emulsifier and potassium nitrate, wherein the mass ratio of the chitosan to the acrylic resin to the aluminum hydroxide to the emulsifier to the potassium nitrate is 125-160:8-14:20-50:7-15:10-30. The product with different trigger temperatures can be obtained by adjusting the proportion of the aluminum hydroxide and the potassium nitrate, the grain diameter change is small under different formulas, and the product has the advantages of round molding, good wrapping effect and the like.
Description
Technical Field
The invention belongs to the technical field of fire control, and particularly relates to a perfluoro-hexanone microcapsule fire extinguishing medium and a preparation method thereof.
Background
The perfluoro-hexanone is liquid under the normal condition, the boiling point is 49 ℃, the perfluoro-hexanone can be gasified and volatilized rapidly at normal temperature, and is difficult to preserve and apply, the perfluoro-hexanone is prepared into microcapsules, and the microcapsules are embedded in a high polymer material to form solid molding, so that the perfluoro-hexanone is a good curing and application scheme.
In the prior art, the perfluorohexanone is made into capsules (comprising a capsule shell and a capsule core), and capsule bodies with different trigger temperatures can be obtained by adjusting the formula (the particle size of the capsule bodies is usually changed along with the adjustment of the formula). The applicant found that the stability and fire extinguishing effect of the perfluorinated hexanone are also related to the particle size, and that the stability and fire extinguishing effect of the product can be ensured by round particles, capsule shells with certain hardness and relatively stable particle size.
Disclosure of Invention
In order to solve the problems, the invention provides the perfluorinated hexanone microcapsule fire extinguishing medium and the preparation method thereof, products with different trigger temperatures can be obtained by adjusting the proportion of aluminum hydroxide and potassium nitrate, the particle size change is small under different formulas, and the perfluorinated hexanone microcapsule fire extinguishing medium has the advantages of round molding, good wrapping effect and the like. The technical scheme is as follows:
on one hand, the embodiment of the invention provides a perfluorinated hexanone microcapsule fire extinguishing medium, which comprises a capsule shell and a capsule core, wherein the mass ratio of the capsule core to the capsule shell is 40-65:30-45. Wherein the capsule core comprises perfluoro-hexanone, silicon dioxide, azodiisobutyronitrile and the like, and the mass ratio of the perfluoro-hexanone to the silicon dioxide to the azodiisobutyronitrile is 100:1.0-3.5:0.1-0.3. The capsule shell is prepared from chitosan, acrylic resin, aluminum hydroxide, an emulsifier, potassium nitrate and the like, wherein the mass ratio of the chitosan to the acrylic resin to the aluminum hydroxide to the emulsifier to the potassium nitrate is 125-160:8-14:20-50:7-15:10-30. Wherein, silicon dioxide and azodiisobutyronitrile are used as stabilizing agents for improving the stability of the capsule core. Chitosan is the main component of the capsule shell. The addition of a small amount of acrylic resin can improve the hardness of the capsule shell and ensure that the capsule shell is more round and the particle size distribution is more stable. The potassium nitrate is used as an oxidant, the triggering temperature can be increased by increasing the dosage, and the triggering temperature can be reduced by reducing the dosage. The role of aluminum hydroxide is several: firstly, as a lifting trigger regulator, the use amount can be increased to reduce the trigger temperature, and the use amount can be reduced to lift the trigger temperature; secondly, as a filler, the hardness of the capsule shell is improved; thirdly, the product is precipitated faster as a flocculating agent, and the precipitation temperature is controllable.
Wherein the particle size of the perfluoro-hexanone microcapsule fire extinguishing medium is 40-100 mu m, the ratio of less than 40 μm and more than 100 μm is less than 5%, and aluminum hydroxide is adjusted (by reasoning, aluminum hydroxide as a flocculant and filler, the effect of which on particle size should be large, in practice very small) and the effect of potassium nitrate on particle size should be very small.
The triggering temperature of the perfluorinated hexanone microcapsule fire extinguishing medium is 135-150 ℃, and the triggering temperature can be realized by adjusting the dosage of aluminum hydroxide and potassium nitrate so as to adapt to different scenes.
Wherein, the emulsifier in the embodiment of the invention is selected from SR-20, ER-30 or ER-10, etc. Preferably, the emulsifier comprises SR-20 and ER-10, and the mass ratio of SR-20 to ER-10 is 1:1-3. More preferably, the emulsifier comprises SR-20 and ER-10, and the mass ratio of SR-20 to ER-10 is 1:2. wherein SR-20 is an anionic emulsifier, and ER-30 or ER-10 is a nonionic emulsifier.
Preferably, the embodiment of the invention provides a perfluorinated hexanone microcapsule fire extinguishing medium, which comprises a capsule shell and a capsule core, wherein the mass ratio of the capsule core to the capsule shell is 50:33. wherein the capsule core comprises perfluoro-hexanone, silicon dioxide and azodiisobutyronitrile, and the mass ratio of the perfluoro-hexanone to the silicon dioxide to the azodiisobutyronitrile is 100:2:0.2. wherein the capsule shell is prepared from chitosan, acrylic resin, aluminum hydroxide, an emulsifier and potassium nitrate, and the mass ratio of the chitosan to the acrylic resin to the aluminum hydroxide to the emulsifier to the potassium nitrate is 150:10:20-50:12:10-30. Wherein the emulsifier comprises SR-20 and ER-10, and the mass ratio of SR-20 to ER-10 is 1:2.
on the other hand, the invention also provides a preparation method of the perfluorinated hexanone microcapsule fire extinguishing medium, which comprises the following steps:
(1) And uniformly mixing the perfluoro-hexanone, the silicon dioxide and the azodiisobutyronitrile according to the proportion at room temperature to obtain the fire extinguishing agent liquid, wherein the stirring speed is 2000-3000r/min, and the stirring time is more than 1h.
(2) At room temperature, potassium nitrate is dissolved in chitosan acetic acid aqueous solution according to the proportion to prepare a water phase; wherein the concentration of the acetic acid is 1-2% (volume concentration), and the concentration of the chitosan is as high as possible.
(3) Slowly adding fire extinguishing agent liquid, acrylic resin and emulsifying agent into water phase at 20-45deg.C, and emulsifying at high speed to obtain emulsion; the stirring speed is more than 3500r/min, and the emulsifying time is 2.0-3.5h.
(4) Adding aluminum hydroxide according to a proportion under the condition of 20-45 ℃, stirring for 30-60min at the stirring speed of 200-500r/min, and standing for 1-2h.
(5) Filtering (specifically, suction filtration), washing with water and vacuum drying (the temperature is preferably less than 40 ℃) the product of the step (4) to obtain the perfluorinated hexanone microcapsule fire extinguishing medium.
The invention has the following advantages:
(1) The triggering temperature can be adjusted by adjusting aluminum hydroxide and potassium nitrate, for example, the triggering temperature can be adjusted to 140 ℃ and 150 ℃, and the aluminum hydroxide and potassium nitrate are mainly used for fireproof patches;
(2) The product quality is stable, the storage temperature is between minus 30 ℃ and 60 ℃, and the effective time is 60 months after installation;
(3) The capsule particles have stable size (are too large to be broken and unstable in forming, are too small to be hardened and have larger wall thickness to influence the fire extinguishing effect), moderate hardness and round surface, and ensure the fire extinguishing effect and stability;
(4) The fire extinguishing effect is good, and the fire extinguishing time is less than 10s under the recommended use amount.
Drawings
FIG. 1 is an electron microscopic view of the perfluoro-hexanone microcapsule fire extinguishing medium produced in example 1;
fig. 2 is a partial enlarged view of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Example 1
The embodiment 1 provides a preparation method of a perfluorinated hexanone microcapsule fire extinguishing medium, which comprises the following steps:
(1) At room temperature, 490 parts by weight of perfluorinated hexanone, 10 parts by weight of silicon dioxide and 1 part by weight of azodiisobutyronitrile are uniformly mixed according to the proportion to obtain the fire extinguishing agent liquid, the stirring speed is 2500r/min, and the stirring time is 2h.
(2) At room temperature, potassium nitrate is dissolved in chitosan acetic acid aqueous solution according to the proportion to prepare a water phase; wherein the amount of potassium nitrate was 42 parts by weight, the amount of chitosan was 225 parts by weight, and the amount of acetic acid was small, and the present example did not include the amount of acetic acid.
(3) Slowly adding 15 parts by weight of the fire extinguishing agent liquid obtained in the step (1), 15 parts by weight of the acrylic resin, 6 parts by weight of SR-20 and 12 parts by weight of ER-10 into the water phase obtained in the step (2) at the temperature of 30 ℃ and emulsifying at a high speed to obtain an emulsion; the stirring speed is 4000r/min, and the emulsifying time is 3h.
(4) At 30 ℃, 30 parts by weight of aluminum hydroxide is added according to the proportion, and the mixture is stirred for 50min at the stirring speed of 300r/min and then is kept stand for 2h.
(5) And (3) carrying out suction filtration, water washing and vacuum drying (the temperature is 30 ℃) on the product of the step (4) to obtain the perfluoro-hexanone microcapsule fire extinguishing medium.
Example 2
The embodiment 2 provides a preparation method of a perfluorinated hexanone microcapsule fire extinguishing medium, which comprises the following steps:
(1) At room temperature, 490 parts by weight of perfluorinated hexanone, 10 parts by weight of silicon dioxide and 1 part by weight of azodiisobutyronitrile are uniformly mixed according to the proportion to obtain the fire extinguishing agent liquid, the stirring speed is 2500r/min, and the stirring time is 2h.
(2) At room temperature, potassium nitrate is dissolved in chitosan acetic acid aqueous solution according to the proportion to prepare a water phase; wherein the amount of potassium nitrate was 15 parts by weight, the amount of chitosan was 225 parts by weight, and the amount of acetic acid was small, and the present example did not include the amount of acetic acid.
(3) Slowly adding 15 parts by weight of the fire extinguishing agent liquid obtained in the step (1), 15 parts by weight of the acrylic resin, 6 parts by weight of SR-20 and 12 parts by weight of ER-10 into the water phase obtained in the step (2) at 25 ℃ and emulsifying at a high speed to obtain an emulsion; the stirring speed is 4000r/min, and the emulsifying time is 3h.
(4) 58 parts by weight of aluminum hydroxide is added according to the proportion under the condition of 25 ℃, stirred for 50min at the stirring speed of 300r/min, and then kept stand for 2h.
(5) And (3) carrying out suction filtration, water washing and vacuum drying (the temperature is 35 ℃) on the product of the step (4) to obtain the perfluoro-hexanone microcapsule fire extinguishing medium.
Example 3
Embodiment 3 provides a preparation method of a perfluorinated hexanone microcapsule fire extinguishing medium, which comprises the following steps:
(1) At room temperature, 490 parts by weight of perfluorinated hexanone, 10 parts by weight of silicon dioxide and 1 part by weight of azodiisobutyronitrile are uniformly mixed according to the proportion to obtain the fire extinguishing agent liquid, the stirring speed is 2500r/min, and the stirring time is 2.5h.
(2) At room temperature, potassium nitrate is dissolved in chitosan acetic acid aqueous solution according to the proportion to prepare a water phase; wherein the amount of potassium nitrate was 27 parts by weight, the amount of chitosan was 225 parts by weight, and the amount of acetic acid was small, and the present example did not include the amount of acetic acid.
(3) Slowly adding 15 parts by weight of the fire extinguishing agent liquid obtained in the step (1), 15 parts by weight of the acrylic resin, 6 parts by weight of SR-20 and 12 parts by weight of ER-10 into the water phase obtained in the step (2) at 40 ℃ and emulsifying at a high speed to obtain an emulsion; the stirring speed was 4200r/min and the emulsification time was 2.5h.
(4) 45 parts by weight of aluminum hydroxide is added according to the proportion under the condition of 30 ℃, stirred for 50min at the stirring speed of 200r/min, and then kept stand for 1.5h.
(5) And (3) carrying out suction filtration, water washing and vacuum drying (the temperature is 30 ℃) on the product of the step (4) to obtain the perfluoro-hexanone microcapsule fire extinguishing medium.
Comparative example 1
Comparative example 1 is substantially the same as example 1 except that: 225 parts by weight of chitosan was directly added without adding acrylic resin.
Comparative example 2
Comparative example 2 is substantially the same as example 2 except that: 225 parts by weight of chitosan was directly added without adding acrylic resin.
Comparative example 3
Comparative example 3 is substantially the same as example 1 except that: in the step (4), 30 parts by weight of alumina was added and left standing for 5 hours.
Particle size ratio test, the results are shown in table 1:
TABLE 1
It can be seen from examples 1-3 and comparative examples 1-2 that the particle size in this example is not substantially affected by the amount of aluminum hydroxide used; as can be seen from comparative examples 1 and 2, the particle size variation was large without adding acrylic resin; as can be seen from comparative example 3, without adding aluminum hydroxide, the size distribution range of the particles is large and the particle diameter is small. From fig. 1-2 (processed to make the image more clear), the particles prepared in this example had round surfaces and were substantially free of broken particles.
Fire extinguishing test
The product was made into a fire extinguishing patch with dimensions 34mm 24mm 3mm, a protective volume 70L, and a weight of 60g. The results are shown in Table 2:
TABLE 2
It can be seen from table 2 that in this patent, since the particle size is stable, adjusting the ratio can adjust the trigger temperature, but the effect on fire extinguishing is not much. It can be seen from examples 1-2 and comparative examples 1-2 that the addition of the acrylic resin has an effect on the trigger temperature and the extinguishing effect, and that the trend of the trigger temperature is changed and the extinguishing effect is changed due to the difference in the capsule particle size from example 1 to comparative example 1 and from example 2 to comparative example 2. As can be seen from comparative example 3, the particle distribution is very dispersed due to the very poor flocculation effect of alumina, and the applicant suspects that part of the capsules are broken, resulting in a higher trigger temperature and a poor fire extinguishing effect.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The perfluorinated hexanone microcapsule fire extinguishing medium comprises a capsule shell and a capsule core, and is characterized in that the mass ratio of the capsule core to the capsule shell is 40-65:30-45, wherein the capsule core comprises perfluoro-hexanone, silicon dioxide and azodiisobutyronitrile, and the mass ratio of the perfluoro-hexanone to the silicon dioxide to the azodiisobutyronitrile is 100:1.0-3.5:0.1-0.3; the capsule shell is prepared from chitosan, acrylic resin, aluminum hydroxide, an emulsifier and potassium nitrate, wherein the mass ratio of the chitosan to the acrylic resin to the aluminum hydroxide to the emulsifier to the potassium nitrate is 125-160:8-14:20-50:7-15:10-30.
2. The perfluorohexanone microcapsule fire-extinguishing medium according to claim 1, wherein the particle size of the perfluorohexanone microcapsule fire-extinguishing medium is 40-100 μm.
3. The perfluorinated hexanone microcapsule fire extinguishing medium according to claim 1, wherein the triggering temperature of the perfluorinated hexanone microcapsule fire extinguishing medium is 135-150 ℃.
4. The perfluoro hexanone microcapsule fire extinguishing medium according to claim 1, wherein the emulsifier is selected from SR-20, ER-30 or ER-10.
5. The perfluorinated hexanone microcapsule fire extinguishing medium according to claim 1, wherein the emulsifier comprises SR-20 and ER-10, the mass ratio of SR-20 to ER-10 being 1:1-3.
6. The perfluorinated hexanone microcapsule fire extinguishing medium according to claim 1, comprising a capsule shell and a capsule core, wherein the mass ratio of the capsule core to the capsule shell is 50:33, wherein the capsule core comprises perfluoro-hexanone, silicon dioxide and azodiisobutyronitrile, and the mass ratio of the perfluoro-hexanone to the silicon dioxide to the azodiisobutyronitrile is 100:2:0.2; the capsule shell is prepared from chitosan, acrylic resin, aluminum hydroxide, an emulsifier and potassium nitrate, wherein the mass ratio of the chitosan to the acrylic resin to the aluminum hydroxide to the emulsifier to the potassium nitrate is 150:10:20-50:12:10-30 parts of a base; the emulsifier comprises SR-20 and ER-10, wherein the mass ratio of the SR-20 to the ER-10 is 1:2.
7. a method for preparing a perfluoro hexanone microcapsule fire extinguishing medium according to any one of claims 1-6, characterized in that the method comprises:
(1) Uniformly mixing perfluoro-hexanone, silicon dioxide and azodiisobutyronitrile according to the proportion to obtain fire extinguishing agent liquid;
(2) Dissolving potassium nitrate in chitosan acetic acid aqueous solution according to a proportion to prepare a water phase;
(3) Slowly adding fire extinguishing agent liquid, acrylic resin and emulsifying agent into water phase at 20-45deg.C, and emulsifying at high speed to obtain emulsion;
(4) Adding aluminum hydroxide according to a proportion at 20-45 ℃ for uniform mixing and standing;
(5) And (3) filtering, washing and vacuum drying the product obtained in the step (4) to obtain the perfluorinated hexanone microcapsule fire extinguishing medium.
8. The method of claim 7, wherein in step (1), the stirring time is greater than 1h; in the step (3), the emulsification time is 2.0-3.5h; in the step (4), stirring and reacting for 30-60min, and then standing for 1-2h.
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