CN114184737B - Method for measuring content of hexafluoro-cyclo-triphosphonitrile - Google Patents
Method for measuring content of hexafluoro-cyclo-triphosphonitrile Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 22
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims abstract description 72
- DKQPXAWBVGCNHG-UHFFFAOYSA-N 2,2,4,4,6,6-hexafluoro-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound FP1(F)=NP(F)(F)=NP(F)(F)=N1 DKQPXAWBVGCNHG-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000000243 solution Substances 0.000 claims abstract description 63
- 238000004448 titration Methods 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 239000012490 blank solution Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 36
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 30
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 15
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical group C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- PRZSXZWFJHEZBJ-UHFFFAOYSA-N thymol blue Chemical compound C1=C(O)C(C(C)C)=CC(C2(C3=CC=CC=C3S(=O)(=O)O2)C=2C(=CC(O)=C(C(C)C)C=2)C)=C1C PRZSXZWFJHEZBJ-UHFFFAOYSA-N 0.000 claims description 9
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 6
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- ZPLCXHWYPWVJDL-UHFFFAOYSA-N 4-[(4-hydroxyphenyl)methyl]-1,3-oxazolidin-2-one Chemical compound C1=CC(O)=CC=C1CC1NC(=O)OC1 ZPLCXHWYPWVJDL-UHFFFAOYSA-N 0.000 claims description 5
- CEQFOVLGLXCDCX-WUKNDPDISA-N methyl red Chemical compound C1=CC(N(C)C)=CC=C1\N=N\C1=CC=CC=C1C(O)=O CEQFOVLGLXCDCX-WUKNDPDISA-N 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000012295 chemical reaction liquid Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000002798 polar solvent Substances 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 2
- 239000012488 sample solution Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000035772 mutation Effects 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000012025 fluorinating agent Substances 0.000 description 2
- 238000003682 fluorination reaction Methods 0.000 description 2
- UBIJTWDKTYCPMQ-UHFFFAOYSA-N hexachlorophosphazene Chemical compound ClP1(Cl)=NP(Cl)(Cl)=NP(Cl)(Cl)=N1 UBIJTWDKTYCPMQ-UHFFFAOYSA-N 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- JKUAHMKHSDOYKZ-UHFFFAOYSA-N FC(C(F)(F)F)(OP1N=PN=P[N]1)F Chemical compound FC(C(F)(F)F)(OP1N=PN=P[N]1)F JKUAHMKHSDOYKZ-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- DGTVXEHQMSJRPE-UHFFFAOYSA-N difluorophosphinic acid Chemical class OP(F)(F)=O DGTVXEHQMSJRPE-UHFFFAOYSA-N 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 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
- GKTNLYAAZKKMTQ-UHFFFAOYSA-N n-[bis(dimethylamino)phosphinimyl]-n-methylmethanamine Chemical class CN(C)P(=N)(N(C)C)N(C)C GKTNLYAAZKKMTQ-UHFFFAOYSA-N 0.000 description 1
- -1 phosphazene compound Chemical class 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for measuring the content of a hexafluoro-cyclo-triphosphazene product, which comprises the steps of dissolving a sample by a solvent, adding excessive sodium methoxide solution, adding proper amount of water, titrating by inorganic acid, determining a titration end point by using mutation of an indicator, preparing a blank solution by the same method, and calculating the content of the hexafluoro-cyclo-triphosphazene product. The invention can effectively determine the content of the hexafluoro-cyclo-triphosphazene product. The invention has the advantages of simple operation, high accuracy, short test time and low test cost, and greatly simplifies the measurement steps of the hexafluoro-cyclotriphosphazene product.
Description
Technical Field
The invention belongs to the field of analysis and test, and particularly relates to a method for testing the content of hexafluoro-cyclo-triphosphonitrile.
Background
The phosphazene compound has excellent flame retardant property. The hexafluoro-cyclotriphosphazene is an intermediate of a plurality of phosphazene compounds, so that the synthesis of the hexafluoro-cyclotriphosphazene has good application prospect; some of its derivatives are high-end flame retardants, which are widely used in high-efficiency flame retardance of lithium batteries, such as pentafluoroethoxycyclotriphosphazene, pentafluorophosphazene-based difluorophosphates. At present, hexafluoro-cyclotriphosphazene is mainly formed by fluorination of hexachloro-cyclotriphosphazene and a fluorinating agent, hexachloro-cyclotriphosphazene is dissolved in an organic solvent, the fluorinating agent and a catalyst are added, and after the fluorination reaction, the target product hexafluoro-cyclotriphosphazene is obtained after rectification (CN 113004322A and patent application number CN 112175010A).
The common detection methods of hexafluoro-cyclo-triphosphazene are liquid chromatography (patent application number CN 112175010A) and gas chromatography (literature number: gas chromatography-nitrogen-phosphorus detector is used for measuring melamine in milk and milk powder), the method has the advantages of high instrument price, long instrument stability time and long whole detection period, and is not beneficial to the rapid detection of hexafluoro-cyclo-triphosphazene. The method is characterized in that excessive sodium methoxide is added into hexafluoro-cyclotriphosphazene organic solvent, the hexafluoro-cyclotriphosphazene and the sodium methoxide react in a molar ratio of 1:3, the excessive sodium methoxide is changed into sodium hydroxide and methanol by adopting water, the titration is carried out by adopting inorganic acid, and the content of hexafluoro-cyclotriphosphazene is determined by indicator color change measurement. The method is simple to operate, greatly simplifies the measuring step of the content of the hexafluoro-cyclotriphosphazene product, shortens the analysis time and reduces the analysis cost; meanwhile, the titration end point jump is obvious, personal errors are reduced, and the repeatability and accuracy of results are improved.
Disclosure of Invention
The invention aims to solve the problems of long detection period and the like in the prior art, adopts a back titration method to measure the content of the hexafluoro-cyclo-triphosphazene, has lower analysis cost than an instrument, does not need complex pretreatment, can rapidly finish the measurement of the content of the hexafluoro-cyclo-triphosphazene, and provides a simple and rapid analysis method for the measurement of the content of the hexafluoro-cyclo-triphosphazene.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
the method for measuring the content of hexafluoro-cyclo-triphosphazene is characterized by comprising the following specific steps:
1) Weighing hexafluoro-cyclo-triphosphonitrile product, placing into a conical flask containing 50mL of solvent, adding excessive sodium methoxide solution, adding 50mL of water and 3-5 drops of indicator, titrating with inorganic acid standard titration solution until the indicator mutation is the end point.
2) Blank tests were also performed in step 1 except that no sample was added.
3) The content of the hexafluoro-cyclotriphosphazene reaction liquid is calculated, and the calculation formula is as follows.
W is the content of a hexafluoro-cyclotriphosphazene product (or reaction liquid), and the content is calculated by the mass fraction of the hexafluoro-cyclotriphosphazene;
c is the concentration of an acidic standard titration solution, and the unit mol/L;
V is the volume of the sample solution consumed by the acidic standard titration solution, per ml;
v 0 is the volume of the blank solution spent acid standard titration solution in ml;
m is the molar mass of hexafluoro-cyclotriphosphazene;
m is the mass of the sample in g.
The solvent is selected from polar solvents for dissolving hexafluorocyclotriphosphazene, including acetonitrile or organic alcohols such as methanol, ethanol, propanol, butanol, etc., but is not limited thereto.
The inorganic acid standard titration solution is inorganic acid standard titration solution and the like, but is not limited to the inorganic acid standard titration solution;
The electrodeless acid standard titration solution is selected from sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and perchloric acid;
the indicator is selected from ethanol solution containing phenolphthalein, methyl red, thymol blue, bromothymol blue or thymol blue;
Preferably, the indicator is phenolphthalein, methyl red, thymol blue, bromothymol blue or thymol blue ethanol solution with the mass fraction of 1%;
the sodium methoxide solution is selected from solvents for dissolving sodium methoxide, such as methanol, ethanol, propanol, etc., including but not limited to, the concentration of the sodium methoxide solution is 0.05mol/L to 0.2mol/L.
The mass ratio of the hexafluoro-cyclotriphosphazene to the sodium methoxide in the step 1) is 1:3-1:8.
The invention has the beneficial effects that:
1. The invention provides a new thought for measuring the content of the hexafluoro-cyclo-triphosphazene product, which is simple in operation and accurate and reliable in result, and provides a new method for quality control of the hexafluoro-cyclo-triphosphazene product by manufacturers and quality identification of the hexafluoro-cyclo-triphosphazene product by a third-party detection mechanism.
2. According to the property of hexafluoro-cyclo-triphosphazene, acetonitrile or alcohol is adopted as a solvent to facilitate the reaction of sodium methoxide solution with the solution, and after water is added, sodium methoxide is changed into methanol and sodium hydroxide; inorganic acid standard titration solution is used as a titrant and a proper indicator, and the solution is uniform and transparent and has obvious abrupt transition end point in the whole titration process; the accuracy and repeatability of the content of the hexafluoro-cyclo-triphosphazene product are ensured.
3. According to the invention, the inorganic acidic standard solution is adopted to measure the content of the hexafluorocyclotriphosphazene product, so that the detection cost is reduced compared with the instrument analysis, the analysis event is shortened, and the method is simpler, more convenient and faster.
Detailed Description
The present invention will be further illustrated by the following examples, which are given by way of illustration only and are not intended to be limiting.
Example 1
0.2483G of hexafluoro-cyclotriphosphazene (M= 248.93 g/moL) is weighed and placed in a 250mL conical flask containing 50mL of acetonitrile, 50mL of 0.1moL/L sodium methoxide solution (0.1 moL/L sodium methoxide solution is prepared by adding ethanol for dissolution) is added, 3-10 drops of 1% phenolphthalein indicator (1 g is weighed and dissolved in 100mL of ethanol) and 20mL of water are added, and then a 0.1021moL/L hydrochloric acid standard titration solution (prepared and calibrated according to GB/T601) is used for titration until the solution turns red into colorless, and the titration volume is 21.05mL. A blank of 50mL of 0.1mol/L sodium methoxide solution was used, and the titration volume of the blank solution was 50.23mL. The hexafluoro-cyclotriphosphazene content was measured to be 99.47%. The content of hexafluoro-cyclotriphosphazene measured by high performance liquid chromatography is 99.56%.
The hexafluoro-cyclotriphosphazene content is calculated as follows:
example 2
0.2475G of hexafluorocyclotriphosphazene (M= 248.93 g/moL) was weighed and placed in a 250mL conical flask containing 50mL of ethanol, 50mL of 0.1moL/L sodium methoxide solution (dissolved in ethanol to give a solution containing 0.1moL/L sodium methoxide) was added, 3 to 10 drops of 1% thymol blue indicator (1 g was weighed, dissolved in 100mL of ethanol) and 20mL of water were added, and then, a standard titration solution of 0.1005moL/L perchloric acid (prepared and calibrated with reference to GB/T601) was used for titration until the solution turned from blue to yellow, and the titration volume was 21.55mL. A blank of 50mL of 0.1mol/L sodium methoxide solution was used, and the titration volume of the blank solution was 51.03mL. The hexafluoro-cyclotriphosphazene content was measured to be 99.33%.
The hexafluoro-cyclotriphosphazene content is calculated as follows:
Example 3
0.2456G of hexafluorocyclotriphosphazene (M= 248.93 g/moL) was weighed and placed in a 250mL conical flask containing 50mL of methanol, 50mL of a 0.1moL/L sodium methoxide solution (dissolved in methanol to give a 0.1moL/L sodium methoxide solution) was added, 3 to 10 drops of a 1% methyl red indicator (1 g of methyl red was weighed, dissolved in 100mL of ethanol) and 20mL of water were added, and then, after the solution became red by titration with a 0.05105moL/L sulfuric acid standard titration solution (see GB/T601), the titration volume was 21.19mL. A blank was prepared with 50mL of 0.1mol/L sodium methoxide solution and the titration volume of the blank was 50.04mL. The hexafluoro-cyclotriphosphazene content was measured to be 99.52%.
The hexafluoro-cyclotriphosphazene content is calculated as follows:
Example 4
0.4476G of hexafluoro-cyclotriphosphazene (M= 248.93 g/moL) was weighed and placed in a 250mL conical flask containing 50mL of propanol, 50mL of a 0.2moL/L sodium methoxide solution (dissolved in propanol to give a 0.2moL/L sodium methoxide solution) was added, 3 drops of 1% phenolphthalein indicator and 20mL of water were added, and then the mixture was titrated with a 0.4956moL/L hydrochloric acid standard titration solution (see GB/T601) until the solution became colorless from red, and the titration volume was 14.21mL. A blank of 50mL of 0.2mol/L sodium methoxide solution was used, and the titration volume of the blank solution was 25.30mL. The hexafluoro-cyclotriphosphazene content was measured to be 99.52%.
The hexafluoro-cyclotriphosphazene content is calculated as follows:
Example 5
0.2546G of hexafluorocyclotriphosphazene (M= 248.93 g/moL) sample is weighed, placed in a 250mL conical flask containing 50mL of butanol, 50mL of 0.1moL/L sodium methoxide solution (0.1 moL/L sodium methoxide solution is prepared by dissolving butanol), 3-10 drops of 1% thymol blue indicator (1 g thymol blue is weighed and dissolved in 100mL of ethanol) and 20mL of water are added, and then, a 0.05060moL/L phosphoric acid standard titration solution (refer to GB/T601) is used for titration until the solution turns from blue to yellow, and the titration volume is 21.06mL. A blank of 50mL of 0.1mol/L sodium methoxide solution was used, and the titration volume of the blank solution was 51.23mL. The hexafluoro-cyclotriphosphazene content was measured to be 99.51%.
The hexafluoro-cyclotriphosphazene content is calculated as follows:
Example 6
0.2435G of hexafluoro-cyclotriphosphazene (M= 248.93 g/moL) sample is weighed, placed in a 250mL conical flask containing 50mL of methanol, 30mL of 0.1moL/L sodium methoxide solution (0.1 moL/L sodium methoxide solution is prepared by adding methanol to dissolve), 3-10 drops of 1% bromothymol blue indicator (1 g bromothymol blue is weighed and dissolved in 100mL of ethanol) and 20mL of water are added, and then, a 0.1011moL/L nitric acid standard titration solution (refer to GB/T601) is used for titration until the solution turns red into colorless, and the titration volume is 2.19mL. A blank of 30mL of 0.1mol/L sodium methoxide solution was used, and the titration volume of the blank solution was 31.02mL. The hexafluoro-cyclotriphosphazene content was measured to be 99.32%.
The hexafluoro-cyclotriphosphazene content is calculated as follows:
Example 7 (repeatability test)
About 0.25g of hexafluoro-cyclotriphosphazene is weighed and placed in 6 250mL beakers containing 50mL of acetonitrile, 50mL of 0.1mol/L sodium methoxide solution (0.1 mol/L sodium methoxide solution is prepared by adding ethanol for dissolution) is added, 3-10 drops of 1% phenolphthalein indicator (1 g is weighed and dissolved in 100mL of ethanol) and 20mL of water are added, and then a 0.1021mol/L hydrochloric acid standard titration solution (prepared and calibrated according to GB/T601) is used for titration until the solution turns red into colorless, and a blank test is performed in the same way.
Table 1 repeatability test
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | RSD/％ | Polar error/% |
| Method of the invention/% | 99.64 | 99.32 | 99.10 | 99.65 | 99.56 | 99.21 | 0.24 | 0.54 |
While the foregoing describes the embodiments of the present invention, it is not intended to limit the scope of the present invention, and various modifications or variations may be made by those skilled in the art without the need for inventive effort on the basis of the technical solutions of the present invention.
Claims (9)
1. The method for measuring the content of the hexafluoro-cyclo-triphosphazene is characterized by comprising the following specific steps:
1) Weighing hexafluoro-cyclo-triphosphonitrile, placing the hexafluoro-cyclo-triphosphonitrile in a conical bottle containing a solvent, adding sodium methoxide solution, adding water and 3-5 drops of indicator, and titrating with an inorganic acid standard titration solution until the indicator is suddenly changed to be an end point;
2) In the step 1), blank tests are carried out simultaneously except that no sample is added;
3) The content of hexafluoro-cyclo-triphosphazene reaction liquid is calculated as follows:
；
W is the content of hexafluoro-cyclo-triphosphazene, and the content is calculated by the mass fraction of hexafluoro-cyclo-triphosphazene;
c is the concentration of an acidic standard titration solution, and the unit mol/L;
V is the volume of the sample solution consumed by the acidic standard titration solution, per ml;
V0 is the volume of the blank solution consumed acid standard titration solution, per ml;
m is the molar mass of hexafluoro-cyclotriphosphazene;
m is the mass of the sample in g.
2. The method for measuring the content of hexafluoro-cyclotriphosphazene according to claim 1, wherein the solvent in the step 1) is selected from polar solvents for dissolving hexafluoro-cyclotriphosphazene.
3. The method for determining the content of hexafluorocyclotriphosphazene according to claim 2, wherein the polar solvent comprises acetonitrile or organic alcohols.
4. The method for measuring the content of hexafluorocyclotriphosphazene according to claim 1, which is characterized in that the concentration of the acidic standard titration solution is 0.05mol/L to 0.5mol/L; the inorganic acid standard titration solution is selected from sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and perchloric acid.
5. The method for determining the content of hexafluorocyclotriphosphazene according to claim 1, wherein the indicator is selected from the group consisting of phenolphthalein, methyl red, thymol blue, bromothymol blue and thymol blue ethanol solution.
6. The method for measuring the content of hexafluorocyclotriphosphazene according to claim 1, wherein the solvent of the sodium methoxide solution is methanol, ethanol or propanol in which sodium methoxide is dissolved.
7. The method for measuring the content of hexafluorocyclotriphosphazene according to claim 1, wherein the concentration of the sodium methoxide solution is 0.05mol/L to 0.2mol/L.
8. The method for measuring the content of hexafluoro-cyclotriphosphazene according to claim 1, wherein the ratio of the amount of hexafluoro-cyclotriphosphazene to sodium methoxide in the step 1) is 1:3 to 1:8.
9. The method for determining the content of hexafluorocyclotriphosphazene according to claim 3, wherein the organic alcohol comprises methanol, ethanol, propanol and butanol.
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