Preparation method of antimony oxychloride composite flame retardant
By preparing a chlorine oxyantimony composite flame retardant, the problem of difficult recycling of catalytic cracking balancer was solved, realizing the production of high-value-added products that are resource-efficient and environmentally friendly.
Patent Information
- Application Number
- CN202410967442.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2026-01-20
AI Technical Summary
The difficulty in recycling catalytic cracking balancers leads to resource waste and environmental pollution.
A composite flame retardant with an outer layer of antimony oxychloride was prepared by using a catalytic cracking balancer as raw material, grinding and activating it, adding it to the process of preparing antimony oxychloride, and then depositing, separating and drying it.
The resource utilization of catalytic cracking balancer has been realized, and a high-value-added antimony oxychloride composite flame retardant has been prepared. The process is simple, low-cost, and environmentally friendly.
Smart Images
Figure CN121362371A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of flame retardants, and relates to a preparation method of antimony oxychloride composite flame retardant. BACKGROUND
[0002] Since the 1970s, the application field and application technology of antimony products have been continuously expanded and improved. From the demand for antimony products in industrialized countries, it can be seen that the application of antimony products has developed from metal to its compounds and salt products. The output of the domestic catalytic cracking equilibrium agent is large and the quality is unstable. Except for part of which can be regenerated for use, most of which is treated as solid waste or hazardous waste, the generated waste residue is buried in place, causing resource waste and environmental pollution. The equilibrium agent contains a small amount of rare earth elements, which are of high value, and a high content of silicon and aluminum elements, which are of low price, and an urgent need for resource utilization solutions.
[0003] In summary, the prior art has the problem of difficulty in recycling catalytic cracking equilibrium agent. SUMMARY
[0004] The purpose of the present application is to provide a preparation method of antimony oxychloride composite flame retardant, which solves the problem of difficulty in recycling catalytic cracking equilibrium agent in the prior art.
[0005] The technical scheme adopted by the present application is a preparation method of antimony oxychloride composite flame retardant, which specifically comprises the following steps:
[0006] Step one, take catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid and water;
[0007] Step two, pretreat the catalytic cracking equilibrium agent to obtain an equilibrium agent solution, and add antimony trichloride to hydrochloric acid to obtain an antimony trichloride solution;
[0008] Step three, add the antimony trichloride solution dropwise to the equilibrium agent solution and stir for 3-5 hours to obtain a first mixed solution;
[0009] Step four, add an alkaline solution to the first mixed solution to neutralize to pH 7-8, and stand to make the precipitate in the first mixed solution settle to the bottom, the upper clear liquid is clear, then pour out the upper clear liquid, and filter the bottom turbid liquid to obtain a filter cake;
[0010] Step five, wash and dry the filter cake to obtain the antimony oxychloride composite flame retardant.
[0011] The present application has the following characteristics:
[0012] The catalytic cracking equilibrium agent composition contains molecular sieve and binder, and the micro-morphology is spherical or ellipsoidal, and the particle size is 30-120 mu m; the binder is one of kaolin, pseudo-boehmite, hydrochloric acid and aluminum glue; the mass concentration of hydrochloric acid is 10%-20%.
[0013] The specific steps of the catalytic cracking equilibrium agent pretreatment are: the catalytic cracking equilibrium agent is ground by using a grinder, the ground catalytic cracking equilibrium agent is added into an activator for activation for 3-6 hours, a complexing agent is added to remove metal ions, when the solution color is colorless, the metal ions are removed completely, and the pretreatment is completed.
[0014] The particle size of the ground catalytic cracking equilibrium agent is D50=5-40 mu m, and D97=10-120 mu m; the activator comprises an acidic activator, an alkaline activator and electrochemical corrosion.
[0015] The alkaline activator is one or a mixture of several of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and sodium peroxide, and the mass concentration of the alkaline activator is 1-3 %;
[0016] The acidic activator is one or a mixture of several of hydrochloric acid, sulfuric acid and oxalic acid, and the mass concentration of the acidic activator solution is 1-5 %;
[0017] The complexing agent is one of salicylic acid, citric acid, ethylenediaminetetraacetic acid and sodium salt, thiocyanate and phenol, and the mass concentration of the complexing agent is 0.1-10 %.
[0018] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:(2-5).
[0019] The mass ratio of the equilibrium agent solution to the antimony trichloride solution in the first mixed solution is 1:(6-7).
[0020] The alkaline solution is a saturated solution containing one or a mixture of several of sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate and ammonia.
[0021] The particle size of the antimony oxychloride composite flame retardant is 3-50 mu m.
[0022] The antimony oxychloride composite flame retardant is prepared by using the domestic abundant catalytic cracking equilibrium agent as a raw material, adding the catalytic cracking equilibrium agent into the antimony oxychloride preparation process after grinding and activation, and depositing, separating and drying, the process is simple, the raw material cost is low, the added value is high, the environment is friendly, and the problem of recycling of the catalytic cracking equilibrium agent is solved. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is the scanning electron microscope image of the antimony oxychloride composite flame retardant obtained in Example 1 in the preparation method of the antimony oxychloride composite flame retardant.
[0024] Figure 2 It is the scanning electron microscope image of the antimony oxychloride composite flame retardant obtained in Example 2 in the preparation method of the antimony oxychloride composite flame retardant.
[0025] Figure 3 Figure 3 is a scanning electron microscope image of the antimony oxychloride composite flame retardant obtained in Example 3 of the preparation method of the antimony oxychloride composite flame retardant of the present application;
[0026] Figure 4 Figure 4 is a scanning electron microscope image of the antimony oxychloride composite flame retardant obtained in Example 4 of the preparation method of the antimony oxychloride composite flame retardant of the present application;
[0027] Figure 5 Figure 5 is a scanning electron microscope image of the antimony oxychloride composite flame retardant obtained in Example 5 of the preparation method of the antimony oxychloride composite flame retardant of the present application;
[0028] Figure 6 Figure 6 is a scanning electron microscope image of the antimony oxychloride composite flame retardant obtained in Example 6 of the preparation method of the antimony oxychloride composite flame retardant of the present application;
[0029] Figure 7 Figure 7 is an X-ray diffraction pattern of the antimony oxychloride composite flame retardant obtained in Examples 1-6 of the preparation method of the antimony oxychloride composite flame retardant of the present application. DETAILED DESCRIPTION
[0030] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] The preparation method of the antimony oxychloride composite flame retardant specifically comprises the following steps:
[0032] Step 1: Take catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, and water;
[0033] The catalytic cracking equilibrium agent contains molecular sieve and binder, and has a spherical or ellipsoidal micro-morphology with a particle size of 30-120 μm; the binder is one of kaolin, pseudo-boehmite, hydrochloric acid, and aluminum sol;
[0034] Step 2: The catalytic cracking equilibrium agent is pretreated to obtain an equilibrium agent solution, and the antimony trichloride is added to the hydrochloric acid to obtain an antimony trichloride solution;
[0035] The specific steps of the pretreatment of the catalytic cracking equilibrium agent are as follows: the catalytic cracking equilibrium agent is ground using a grinder, the ground catalytic cracking equilibrium agent is activated in an activator for 3-6 hours, and a complexing agent is added to remove metal ions; when the solution is colorless, the metal ions are completely removed, and the pretreatment is completed.
[0036] The particle size of the ground catalytic cracking equilibrium agent is D50=5-40 μm and D97=10-120 μm; the activator includes an acidic activator, an alkaline activator, and electrochemical corrosion.
[0037] The basic activator is one or a mixture of several of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate or sodium peroxide, and the mass concentration of the basic activator is 1%-3%;
[0038] The acidic activator is one or a mixture of several of hydrochloric acid, sulfuric acid or oxalic acid, and the mass concentration of the acidic activator solution is 1%-5%;
[0039] The complexing agent is one of salicylic acid, citric acid, ethylenediaminetetraacetic acid and its sodium salt, thiocyanate and phenol, and the mass concentration of the complexing agent is 0.1%-10%.
[0040] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:(2-5);
[0041] Step three, drop the antimony trichloride solution into the balancing agent solution and stir for 3-5 hours to obtain a first mixed solution;
[0042] The mass ratio of the balancing agent solution to the antimony trichloride solution in the first mixed solution is 1:(6-7).
[0043] Step four, add a basic solution to the first mixed solution to neutralize to pH 7-8, and let it stand to make the precipitate in the first mixed solution settle to the bottom, and the upper clear liquid is clear, then pour out the upper clear liquid, and filter the bottom turbid liquid to obtain a filter cake;
[0044] The basic solution is a saturated solution containing one or a mixture of several of sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate and ammonia;
[0045] Step five, wash and dry the filter cake to obtain an antimony oxychloride composite flame retardant.
[0046] The particle size of the antimony oxychloride composite flame retardant is 3-50 microns, and the micro-morphology is irregular hexahedral cluster or flower ball particles.
[0047] The antimony oxychloride composite flame retardant can be used as or for synthetic white pigments, paints, various resins and synthetic rubbers, and has excellent flame retardant effect. Thermodynamic studies show that in the Sb 3+ -CI - -H2O system, when the pH value is small, such as 0 or 1, the concentration of chloride ions coordinated with trivalent antimony ions reaches a certain value, and as the total antimony ion concentration in the solution increases, the concentration of antimony ions in the solution at equilibrium also increases significantly; when the pH value is large, the concentration of antimony ions in the solution at equilibrium decreases significantly, and Sb4O5Cl2 and SbOCl precipitate in large amounts. When the total antimony ion concentration is constant, as the pH value increases, the concentration of antimony ions in the solution at equilibrium decreases. In the Sb 3+ -CI -The order from easy to difficult of the hydrolysis products of antimony trichloride in H2O system is Sb4O5Cl2, SbOCl, Sb2O3, Sb(OH)3.
[0048] Example 1
[0049] The preparation method of the antimony oxychloride composite flame retardant specifically comprises the following steps:
[0050] Step one, take catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, and water;
[0051] The mass concentration of the hydrochloric acid is 10%.
[0052] Step two, after pretreatment of the catalytic cracking equilibrium agent, an equilibrium agent solution is obtained, and antimony trichloride is added to hydrochloric acid to obtain an antimony trichloride solution;
[0053] The specific steps of pretreatment of the catalytic cracking equilibrium agent are as follows: the catalytic cracking equilibrium agent is ground by using a grinding machine, the ground catalytic cracking equilibrium agent is activated in an activator for 3 hours, and a complexing agent is added to remove metal ions; when the solution is colorless, the metal ions are removed, and the pretreatment is completed.
[0054] The activator comprises an acidic activator.
[0055] The acidic activator is a mixture of hydrochloric acid and sulfuric acid, and the mass concentration of the acidic activator solution is 1%.
[0056] The complexing agent is salicylic acid, and the mass concentration of the complexing agent is 0.1%.
[0057] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:2.
[0058] Step three, the antimony trichloride solution is added dropwise to the equilibrium agent solution and stirred for 3 hours to obtain a first mixed solution;
[0059] Step four, a basic solution is added to the first mixed solution to neutralize to pH 7, and the precipitate in the first mixed solution is allowed to settle to the bottom, the upper clear liquid is clarified, and then the upper clear liquid is poured out, and the bottom turbid liquid is filtered to obtain a filter cake;
[0060] The basic solution is a saturated solution containing sodium hydroxide and potassium hydroxide.
[0061] Step five, the filter cake is washed and dried to obtain the antimony oxychloride composite flame retardant as shown in Figure 1 .
[0062] Example 2
[0063] The preparation method of the antimony oxychloride composite flame retardant specifically comprises the following steps:
[0064] Step one, take catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, water;
[0065] The mass concentration of hydrochloric acid is 15%.
[0066] Step two, after pretreatment of the catalytic cracking equilibrium agent, the equilibrium agent solution is obtained, and antimony trichloride is added to hydrochloric acid to obtain an antimony trichloride solution;
[0067] The specific steps of pretreatment of the catalytic cracking equilibrium agent are: the catalytic cracking equilibrium agent is ground by a grinding machine, the ground catalytic cracking equilibrium agent is added to an activator for activation for 4.5 hours, and a complexing agent is added to remove metal ions. When the solution color is colorless, the metal ions are removed, and the pretreatment is completed.
[0068] The activator includes an acidic activator; the acidic activator is a mixture of sulfuric acid and oxalic acid, and the mass concentration of the acidic activator solution is 5%;
[0069] The complexing agent is citric acid; and the mass concentration of the complexing agent is 5%.
[0070] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:3.5.
[0071] Step three, the antimony trichloride solution is added dropwise to the equilibrium agent solution and stirred for 4 hours to obtain a first mixed solution;
[0072] Step four, a basic solution is added to the first mixed solution to neutralize to pH 8, and the precipitate in the first mixed solution is allowed to settle to the bottom, the upper clear liquid is clarified, and then the upper clear liquid is poured out. The bottom turbid liquid is filtered to obtain a filter cake;
[0073] The basic solution is a saturated solution containing potassium carbonate and sodium carbonate.
[0074] Step five, the filter cake is washed and dried to obtain an antimony oxychloride composite flame retardant as shown in Figure 2 .
[0075] Example 3
[0076] The preparation method of the antimony oxychloride composite flame retardant specifically includes the following steps:
[0077] Step one, take catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, water;
[0078] The mass concentration of hydrochloric acid is 20%.
[0079] Step two, after pretreatment of the catalytic cracking equilibrium agent, the equilibrium agent solution is obtained, and antimony trichloride is added to hydrochloric acid to obtain an antimony trichloride solution;
[0080] The specific steps of the pre-treatment of the catalytic cracking equilibrium agent are: grinding the catalytic cracking equilibrium agent by using a grinder, adding the ground catalytic cracking equilibrium agent into an activator to activate for 6 hours, then adding a complexing agent to remove metal ions, and when the solution color is colorless, the metal ions are removed completely, and the pre-treatment is completed.
[0081] The activator includes an acidic activator; the acidic activator is sulfuric acid, and the mass concentration of the acidic activator solution is 2%;
[0082] The complexing agent is ethylenediaminetetraacetic acid and its sodium salt; the mass concentration of the complexing agent is 10%.
[0083] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:5.
[0084] Step three, adding the antimony trichloride solution dropwise into the equilibrium agent solution and stirring for 5 hours to obtain a first mixed solution;
[0085] Step four, adding a basic solution into the first mixed solution to neutralize to pH 7, standing to make the precipitate in the first mixed solution settle to the bottom, clarifying the upper clear liquid, then pouring out the upper clear liquid, and filtering the bottom turbid liquid to obtain a filter cake;
[0086] The basic solution is a saturated solution containing ammonia.
[0087] Step five, washing and drying the filter cake to obtain an antimony oxychloride composite flame retardant as shown in Figure 3 .
[0088] Example 4
[0089] The preparation method of the antimony oxychloride composite flame retardant specifically includes the following steps:
[0090] Step one, taking catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, and water;
[0091] The mass concentration of the hydrochloric acid is 12.5%.
[0092] Step two, pre-treating the catalytic cracking equilibrium agent to obtain an equilibrium agent solution, and adding antimony trichloride into hydrochloric acid to obtain an antimony trichloride solution;
[0093] The specific steps of the pre-treatment of the catalytic cracking equilibrium agent are: grinding the catalytic cracking equilibrium agent by using a grinder, adding the ground catalytic cracking equilibrium agent into an activator to activate for 5 hours, then adding a complexing agent to remove metal ions, and when the solution color is colorless, the metal ions are removed completely, and the pre-treatment is completed.
[0094] The activator includes an alkaline activator; the alkaline activator is a mixture of sodium hydroxide and potassium hydroxide, and the mass concentration of the alkaline activator is 1%;
[0095] The complexing agent is thiocyanate; the mass concentration of the complexing agent is 1%.
[0096] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:4.
[0097] Step three, drop the antimony trichloride solution into the equilibrium agent solution and stir for 3.5 hours to obtain a first mixed solution;
[0098] Step four, add a basic solution to the first mixed solution to neutralize to pH 7, stand to make the precipitate in the first mixed solution settle to the bottom, the upper clear liquid is clear, then pour out the upper clear liquid, and filter the bottom turbid liquid to obtain a filter cake;
[0099] The basic solution is a saturated solution containing sodium hydroxide.
[0100] Step five, wash and dry the filter cake to obtain an antimony oxychloride composite flame retardant as shown in Figure 4 .
[0101] Example 5
[0102] The preparation method of the antimony oxychloride composite flame retardant specifically comprises the following steps:
[0103] Step one, take catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, and water;
[0104] The mass concentration of the hydrochloric acid is 17.5%.
[0105] Step two, pretreat the catalytic cracking equilibrium agent to obtain an equilibrium agent solution, and add antimony trichloride to hydrochloric acid to obtain an antimony trichloride solution;
[0106] The specific steps of pretreating the catalytic cracking equilibrium agent are as follows: grind the catalytic cracking equilibrium agent using a grinder, activate the ground catalytic cracking equilibrium agent in an activator for 4.5 hours, and then add a complexing agent to remove metal ions. When the solution color is colorless, the metal ions are removed, and the pretreatment is completed.
[0107] The activator includes a basic activator; the basic activator is sodium carbonate, and the mass concentration of the basic activator is 3%.
[0108] The complexing agent is phenol; the mass concentration of the complexing agent is 3%.
[0109] The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:3.5.
[0110] Step three, drop the antimony trichloride solution into the equilibrium agent solution and stir for 4 hours to obtain a first mixed solution;
[0111] Step four, add the basic solution to the first mixed solution to neutralize to pH 8, stand to make the precipitate in the first mixed solution settle to the bottom, the supernatant is clear, then pour out the supernatant, filter the bottom turbid liquid to obtain a filter cake;
[0112] The basic solution is a saturated solution containing potassium hydroxide;
[0113] Step five, wash the filter cake and dry to obtain the antimony oxychloride composite flame retardant as shown in Figure 5 .
[0114] Example 6
[0115] The preparation method of the antimony oxychloride composite flame retardant specifically comprises the following steps:
[0116] Step one, take catalytic cracking equilibrator, antimony trichloride, hydrochloric acid, and water;
[0117] The mass concentration of the hydrochloric acid is 16%.
[0118] Step two, pretreat the catalytic cracking equilibrator to obtain an equilibrator solution, and add the antimony trichloride to the hydrochloric acid to obtain an antimony trichloride solution;
[0119] The specific steps of the pretreatment of the catalytic cracking equilibrator are as follows: the catalytic cracking equilibrator is ground by using a grinder, the ground catalytic cracking equilibrator is activated in an activator for 5 hours, and a complexing agent is added to remove metal ions; when the solution is colorless, the metal ions are removed, and the pretreatment is completed.
[0120] The activator comprises electrochemical corrosion.
[0121] The complexing agent is one of salicylic acid, citric acid, ethylenediaminetetraacetic acid and its sodium salt, thiocyanate, and phenol; the mass concentration of the complexing agent is 7%.
[0122] The mass ratio of the antimony trichloride to the hydrochloric acid in the antimony trichloride solution is 1:3.
[0123] Step three, add the antimony trichloride solution dropwise to the equilibrator solution and stir for 4 hours to obtain a first mixed solution;
[0124] Step four, add the basic solution to the first mixed solution to neutralize to pH 7, stand to make the precipitate in the first mixed solution settle to the bottom, the supernatant is clear, then pour out the supernatant, filter the bottom turbid liquid to obtain a filter cake;
[0125] The basic solution is a saturated solution containing sodium carbonate.
[0126] Step five, wash the filter cake and dry to obtain the antimony oxychloride composite flame retardant as shown in Figure 6 .
[0127] AsFigures 1-6 As shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 5 and Figure 6, they are scanning electron micrographs of antimony oxychloride composite flame retardants obtained from Example 1 to Example 6, and it can be seen that the morphology of the antimony oxychloride composite flame retardants is irregular hexahedral cluster as flower ball particles.
[0128] As shown in Figure 7, it is an X-ray diffraction pattern of the antimony oxychloride composite flame retardant, and the results show that the XRD of Example 1 to Example 6 is the same phase. Figure 7 As shown in Figure 7, it is an X-ray diffraction pattern of the antimony oxychloride composite flame retardant, and the results show that the XRD of Example 1 to Example 6 is the same phase.
Claims
1. A method for preparing an antimony oxychloride composite flame retardant, characterized in that, Specifically, the following steps are included: Step 1: Take the catalytic cracking equilibrium agent, antimony trichloride, hydrochloric acid, and water; Step 2: After pretreating the catalytic cracking equilibrium agent to obtain an equilibrium agent solution, add antimony trichloride to hydrochloric acid to obtain an antimony trichloride solution; Step 3: Add antimony trichloride solution dropwise to the balancing agent solution and stir for 3-5 hours to obtain the first mixed solution; Step 4: Add an alkaline solution to the first mixed solution to neutralize it to pH 7-8, let it stand to allow the precipitate in the first mixed solution to settle to the bottom, the supernatant to become clear, then pour out the supernatant and filter the bottom turbid liquid to obtain a filter cake. Step 5: Wash and dry the filter cake to obtain antimony oxychloride composite flame retardant.
2. The preparation method of the antimony oxychloride composite flame retardant according to claim 1, characterized in that, The catalytic cracking equilibrium agent comprises molecular sieves and a binder, and has a spherical or ellipsoidal microstructure with a particle size of 30μm-120μm. The binder is one of kaolin, boehmite, hydrochloric acid, and aluminum sol. The mass concentration of the hydrochloric acid is 10%-20%.
3. The preparation method of the antimony oxychloride composite flame retardant according to claim 2, characterized in that, The specific steps of the pretreatment of the catalytic cracking equilibrium agent are as follows: the catalytic cracking equilibrium agent is ground using a grinder, the ground catalytic cracking equilibrium agent is added to an activator and activated for 3-6 hours, and then a complexing agent is added to remove metal ions. When the solution is colorless, the metal ions are completely removed, and the pretreatment is completed.
4. The preparation method of the antimony oxychloride composite flame retardant according to claim 3, characterized in that, The particle size of the ground catalytic cracking balancing agent is D50 = 5μm-40μm and D97 = 10μm-120μm; the activator includes acidic activator, alkaline activator, and electrochemical corrosion agent.
5. The preparation method of the antimony oxychloride composite flame retardant according to claim 4, characterized in that, The alkaline activator is one or a mixture of several of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate or sodium peroxide, and the mass concentration of the alkaline activator is 1%-3%. The acidic activator is one or a mixture of several of hydrochloric acid, sulfuric acid, and oxalic acid, and the mass concentration of the acidic activator solution is 1%-5%. The complexing agent is one of salicylic acid, citric acid, ethylenediaminetetraacetic acid and its sodium salt, thiocyanate, and phenol; the mass concentration of the complexing agent is 0.1%-10%.
6. The preparation method of the antimony oxychloride composite flame retardant according to claim 1, characterized in that, The mass ratio of antimony trichloride to hydrochloric acid in the antimony trichloride solution is 1:(2-5).
7. The preparation method of the antimony oxychloride composite flame retardant according to claim 1, characterized in that, The mass ratio of the balancing agent solution to the antimony trichloride solution in the first mixed solution is 1:(6-7).
8. The method for preparing the antimony oxychloride composite flame retardant according to claim 1, characterized in that, The alkaline solution is a saturated solution containing one or more of the following: sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, and ammonia.
9. The preparation method of the antimony oxychloride composite flame retardant according to claim 1, characterized in that, The particle size of the antimony oxychloride composite flame retardant is 3μm-50μm.