CN111793248B - Talcum powder-magnesium hydroxide composite inorganic flame-retardant filler and preparation method thereof - Google Patents
Talcum powder-magnesium hydroxide composite inorganic flame-retardant filler and preparation method thereof Download PDFInfo
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Abstract
The invention provides a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler and a preparation method thereof, belonging to the technical field of fine chemical engineering. The preparation method of the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler comprises the following steps: mixing talcum powder, magnesium chloride and water to obtain primary slurry; mixing the primary slurry with a composite dispersant, and carrying out wet grinding to obtain secondary slurry; mixing the secondary slurry with calcium hydroxide, and performing liquid-phase deposition coating to obtain composite powder; and carrying out surface modification on the composite powder to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler. The invention takes the talcum powder as the raw material, and adopts the liquid phase deposition method to coat a layer of nano magnesium hydroxide on the surface of the talcum powder, and the prepared composite inorganic flame-retardant filler has the characteristics of good burning charring property, high flame-retardant efficiency and good compatibility with high polymer materials.
Description
Technical Field
The invention relates to the technical field of fine chemical engineering, in particular to a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler and a preparation method thereof.
Background
The magnesium hydroxide is in a hexagonal or amorphous sheet structure, is a green environment-friendly inorganic flame retardant integrating four functions of flame retardance, smoke suppression, drip prevention and filling, has the decomposition temperature of 340-490 ℃, and is widely applied to the field of low-smoke halogen-free flame retardance as a pollution-free inorganic flame retardant. However, magnesium hydroxide as an inorganic flame retardant has the problems of poor char formation during combustion, low flame retardant efficiency, poor compatibility with high polymer materials, great reduction in physical and mechanical properties of the high polymer materials due to large addition amount, and the like, and limits the application prospect thereof.
Disclosure of Invention
The invention aims to provide a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler and a preparation method thereof, and the prepared composite inorganic flame-retardant filler has the characteristics of good burning charring property, high flame-retardant efficiency and good compatibility with a high polymer material.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler, which comprises the following steps:
mixing talcum powder, magnesium chloride and water to obtain primary slurry;
mixing the primary slurry with a composite dispersant, and carrying out wet grinding to obtain secondary slurry;
mixing the secondary slurry with calcium hydroxide, and performing liquid-phase deposition coating to obtain composite powder;
and carrying out surface modification on the composite powder to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler.
Preferably, the talcum powder is prepared by sequentially carrying out primary crushing, secondary crushing and dry grinding on talc raw ore; the particle size of the talcum powder is 400-600 meshes.
Preferably, the mass ratio of the talcum powder to the magnesium chloride is (3-5): 1.
preferably, the composite dispersant is sodium dodecyl benzene sulfonate, sodium lignin sulfonate and vinyl acetate-maleic anhydride copolymer sodium salt; the mass ratio of the sodium dodecyl benzene sulfonate to the sodium lignin sulfonate to the vinyl acetate-maleic anhydride copolymer sodium salt is (3-5): (4-6): (2-4).
Preferably, the mass ratio of the composite dispersant to the talcum powder is (0.009-0.015): 1.
Preferably, the solid content of the primary slurry is 70-80%.
Preferably, the molar ratio of the calcium hydroxide to the magnesium chloride is (1-1.3) to 1; the rotation speed of the wet grinding is 2500-3000 r/min, the time is 2-2.5 h, and the temperature is 75-85 ℃; the grain size of the materials in the secondary slurry is 6000 meshes.
Preferably, the temperature of the liquid phase deposition coating is 110-120 ℃, the liquid phase deposition coating is carried out under the condition of stirring, the speed of stirring is 250-300 r/min, and the time is 0.8-1 h.
Preferably, the composite modifier for surface modification comprises a silane coupling agent, sodium stearate and hexadecyl trimethyl ammonium chloride; the mass ratio of the silane coupling agent to the sodium stearate to the hexadecyl trimethyl ammonium chloride is (6-8) to (1-3); the mass ratio of the composite modifier to the composite powder is (0.008-0.014) to 1.
The invention provides a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler prepared by the preparation method in the technical scheme, which comprises talcum powder and nano-magnesium hydroxide coated on the surface of the talcum powder, wherein the particle size of the talcum powder is 2-3 mu m, and the particle size of the nano-magnesium hydroxide is 30-50 nm.
The invention provides a preparation method of a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler, which comprises the following steps: mixing talcum powder, magnesium chloride and water to obtain primary slurry; mixing the primary slurry with a composite dispersant, and carrying out wet grinding to obtain secondary slurry; mixing the secondary slurry with calcium hydroxide, and performing liquid-phase deposition coating to obtain composite powder; and carrying out surface modification on the composite powder to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler. According to the invention, talcum powder is used as a raw material, a layer of nano magnesium hydroxide is coated on the surface of the talcum powder by a liquid phase deposition method, the nano magnesium hydroxide on the surface is used as a flame retardant material, and meanwhile, the flaky structure of the talcum powder is utilized, so that a carbon layer can be promoted to be formed on the surface of a high polymer in a combustion process, the charring property during combustion is good, heat and combustible gas generated by the high polymer in a protective layer (carbon layer) can be well isolated from being transmitted to the outer layer, and the material is self-extinguished, so that an excellent flame retardant effect is achieved, and the flame retardant efficiency is high. In addition, the composite powder is modified, so that the interface compatibility between the composite powder and a high polymer material can be improved, and the compatibility between the composite inorganic flame-retardant filler and the high polymer material is further improved.
Drawings
FIG. 1 is a flow chart of the method for preparing the talc powder-magnesium hydroxide composite inorganic flame-retardant filler of the present invention.
Detailed Description
The invention provides a preparation method of a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler, which comprises the following steps:
mixing talcum powder, magnesium chloride and water to obtain primary slurry;
mixing the primary slurry with a composite dispersant, and carrying out wet grinding to obtain secondary slurry;
mixing the secondary slurry with calcium hydroxide, and performing liquid-phase deposition coating to obtain composite powder;
and carrying out surface modification on the composite powder to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
According to the invention, talcum powder, magnesium chloride and water are mixed to obtain primary slurry. In the invention, the talcum powder is preferably prepared by sequentially carrying out primary crushing, secondary crushing and dry grinding on talc raw ore. The source of the talc raw ore is not particularly limited in the present invention, and the talc raw ore can be obtained by a method well known in the art, and in the embodiment of the present invention, the talc raw ore is specifically from the haicheng of liaison. In the present invention, before the primary crushing, it is preferable that the talc raw ore is subjected to coarse crushing and washing in this order; the rough crushing and washing are not particularly limited in the present invention and may be carried out according to a procedure well known in the art. After the primary crushing is completed, the diameter of the obtained material is 5-10 cm; the invention has no special limitation on the primary crushing process, and can meet the diameter requirement. The secondary crushing process is not specially limited, and the diameter of the material obtained after secondary crushing can be 5-10 mm. After the secondary crushing is completed, the obtained material is preferably conveyed to a 198 ring roller mill, and a grinding aid is added at the inlet of the ring roller mill for dry grinding to obtain the talcum powder. In the present invention, the grinding aid is preferably triethanolamine; the dry grinding process is not particularly limited in the present invention, and the process known in the art may be performed to achieve the particle size of the talc powder. In the invention, the particle size of the talcum powder is preferably 400-600 meshes. The invention can conveniently prepare primary slurry by controlling the particle size of the talcum powder and can improve the efficiency of subsequent wet grinding.
In the invention, the mass ratio of the talcum powder to the magnesium chloride is preferably (3-5): 1, more preferably (3.5 to 4.5): 1. the mixing process of the talcum powder, the magnesium chloride and the water is not particularly limited in the invention, and the raw materials can be uniformly mixed according to the process well known in the field. In the invention, the solid content of the primary slurry is preferably 70-80%; the invention has no special limit on the using amount of the water, and the solid content of the primary slurry can be achieved.
After the primary slurry is obtained, the primary slurry is mixed with the composite dispersant and is ground by a wet method to obtain the secondary slurry. The process of mixing the primary slurry and the composite dispersant is not particularly limited, and the materials can be uniformly mixed according to the process known in the art. In the present invention, the composite dispersant is preferably sodium dodecylbenzene sulfonate, sodium lignin sulfonate and vinyl acetate-maleic anhydride copolymer sodium salt; the mass ratio of the sodium dodecyl benzene sulfonate to the sodium lignin sulfonate to the vinyl acetate-maleic anhydride copolymer sodium salt is preferably (3-5): (4-6): (2-4), more preferably (3.5-4.5): (4.5-5.5): (2.5-3.5); the mass ratio of the composite dispersant to the talc powder is preferably (0.009-0.015): 1, more preferably (0.010-0.014): 1, and still more preferably (0.012-0.013): 1. The composite dispersant used in the invention has good stability and strong hard water resistance, can prevent the agglomeration of talcum powder particles, and can keep the activity of the surfaces of the talcum powder particles within a certain time, thereby ensuring that the sheet structure of the talcum powder promotes high polymer to form a carbon layer in the combustion process, playing a role in heat insulation and reducing the outward diffusion of volatile products, and further ensuring that high polymer has excellent flame retardant property.
In the invention, the rotation speed of the wet grinding is preferably 2500-3000 r/min, more preferably 2600-2800 r/min, the time is preferably 2-2.5 h, more preferably 2.2-2.3 h, the temperature is preferably 75-85 ℃, and more preferably 80 ℃; the temperature is in particular the temperature of the milled slurry. The wet grinding is preferably carried out in a vertical mixer, and the type of the vertical mixer is not particularly limited in the present invention, and a vertical mixer known in the art may be used. In the invention, the particle size of the material in the secondary slurry is preferably 6000 meshes, the particle size of the talcum powder particles is 6000 meshes (the particle size is 2-3 mu m), the fine talcum powder has a good mechanical reinforcing effect, and the strength of the composite inorganic flame-retardant filler can be enhanced.
After the secondary slurry is obtained, the secondary slurry is mixed with calcium hydroxide for liquid phase deposition coating to obtain the composite powder. In the invention, the molar ratio of the calcium hydroxide to the magnesium chloride is preferably (1-1.3) to 1, more preferably (1.1-1.2) to 1; the process of mixing the secondary slurry and the calcium hydroxide is not particularly limited in the invention, and the materials can be uniformly mixed according to the process well known in the art. In the invention, the temperature of the liquid phase deposition coating is preferably 110-120 ℃ (specifically the temperature of slurry in the liquid phase deposition process), the liquid phase deposition coating is preferably carried out under the condition of stirring, the speed of the stirring is preferably 250-300 r/min, more preferably 260-280 r/min, and the time is preferably 0.8-1 h. The liquid phase deposition coating is preferably carried out in a slurry storage barrel; the pulp storage barrel is not particularly limited in the invention, and the pulp storage barrel is well known in the field.
In the liquid phase deposition coating process, magnesium chloride and calcium hydroxide are subjected to chemical precipitation, and the surfaces of talcum powder particles are coated to form nano-scale magnesium hydroxide.
After the liquid phase deposition coating is finished, the method preferably further comprises the steps of pumping the obtained material into a quick flash evaporation dryer, and carrying out flash evaporation drying by adopting hot air; and then collecting the dried powder by a cloth bag, sending the collected powder into a depolymerization beater through a screw reamer feeder, and depolymerizing and beating to obtain the composite powder. The flash drying, bag collecting and depolymerizing are carried out according to the process known in the art, and the type of the used equipment is not particularly limited. The invention uses the depolymerizing and thrashing machine to disaggregate the collected agglomerated powder and keep the particle size of the primary particles. In the present invention, the particle size of the composite powder is preferably 6000 mesh.
After the composite powder is obtained, the surface of the composite powder is modified to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler. In the present invention, the composite modifier for surface modification preferably includes a silane coupling agent, sodium stearate, and cetyltrimethylammonium chloride; the mass ratio of the silane coupling agent to the sodium stearate to the hexadecyl trimethyl ammonium chloride is preferably (6-8): 1-3), more preferably (6.5-7.5): 1.5-2.5; the mass ratio of the composite modifier to the composite powder is preferably (0.008-0.014): 1, more preferably (0.009-0.013): 1, and still more preferably (0.01-0.012): 1. The invention has no special limitation on the surface modification process, and the composite powder is directly mixed with the composite modifier. According to the invention, the organic groups are linked on the surface of the composite powder by using the composite modifier, so that the interface compatibility between the composite powder filler and the high polymer material is improved, the mechanical property of the high polymer material is improved, the fluidity of the composite powder filler is improved, and the water absorption rate and the oil absorption value are reduced.
After the surface modification is finished, the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler is obtained without any other treatment.
Fig. 1 is a flow chart of a method for preparing a talc powder-magnesium hydroxide composite inorganic flame-retardant filler, as shown in fig. 1, after talc raw ore is crushed and ground by a dry method, 600-mesh talc powder is mixed with magnesium chloride and water, the obtained primary slurry is mixed with a composite dispersant and then ground by a wet method to obtain 6000-mesh slurry, the 6000-mesh slurry is mixed with calcium hydroxide and then sequentially subjected to liquid phase deposition coating, flash evaporation drying, cloth bag collection and deagglomeration and break-up, and the obtained powder is mixed with a composite modifier to be subjected to surface modification to obtain a finished product.
The invention provides a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler prepared by the preparation method in the technical scheme, which comprises talcum powder and nano-magnesium hydroxide coated on the surface of the talcum powder, wherein the particle size of the talcum powder is 2-3 mu m, and the particle size of the nano-magnesium hydroxide is 30-50 nm.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the raw talc ores used are high-quality talc from Haicheng Liaoning;
the preparation process of preparing the talcum powder from the talc raw ore comprises the following steps: the method comprises the following steps of sequentially carrying out coarse crushing, cleaning and primary crushing on talc raw ore, carrying out secondary crushing on the obtained material with the diameter of 5-10 cm, conveying the obtained material with the diameter of 5-10 mm to a 198 ring roller mill, adding a grinding aid (triethanolamine) at the inlet of the ring roller mill, and carrying out dry grinding to obtain 600-mesh talc powder.
Example 1
Mixing 5 tons of talcum powder and magnesium chloride according to the weight ratio of 3: 1, adding water and mixing to obtain first-grade slurry with solid content of 70%;
and (2) feeding the primary slurry into a vertical stirrer, adding a composite dispersant (the mass of sodium dodecyl benzene sulfonate is 3 per mill of the mass of talcum powder, the mass of sodium lignosulfonate is 4 per mill of the mass of talcum powder, and the mass of vinyl acetate-maleic anhydride copolymer sodium is 2 per mill of the mass of talcum powder) for wet grinding, wherein the wet grinding parameters are as follows: stirring for 2h at 2500r/min of a vertical stirrer, and controlling the temperature of the slurry to be 75 ℃ to obtain secondary slurry (the particle size of the material in the secondary slurry is 6000 meshes);
transferring the secondary slurry into a slurry storage barrel, adding calcium hydroxide (the molar ratio of the calcium hydroxide to the magnesium chloride is 1.1: 1), stirring for 1h at the stirring speed of 250r/min, controlling the temperature of the slurry to be 120 ℃ in the stirring process, carrying out liquid phase deposition coating, pumping the obtained slurry into a quick flash evaporation dryer, carrying out flash evaporation drying by adopting clean hot air, collecting the dried material by a cloth bag, and then sending the material into a depolymerization beater to carry out depolymerization beating-up, so as to obtain 6000-mesh composite powder;
and adding a composite modifier into the composite powder (1 ton) for surface modification, wherein the composite modifier and the addition amount of the composite modifier are 6 per mill of the mass of the silane coupling agent (R903), 1 per mill of the mass of the sodium stearate and 1 per mill of the mass of the hexadecyl trimethyl ammonium chloride, so as to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler (the particle size of the talcum powder is 2-3 mu m, and the particle size of the nano magnesium hydroxide is 30-50 nm).
Example 2
Mixing 5 tons of talcum powder and magnesium chloride according to a proportion of 4: 1, adding water and mixing to obtain first-grade slurry with solid content of 70%;
and (2) feeding the primary slurry into a vertical stirrer, adding a composite dispersant (the mass of sodium dodecyl benzene sulfonate is 4 per mill of the mass of talcum powder, the mass of sodium lignosulfonate is 5 per mill of the mass of talcum powder, and the mass of vinyl acetate-maleic anhydride copolymer sodium is 3 per mill of the mass of talcum powder) for wet grinding, wherein the wet grinding parameters are as follows: stirring for 2h at 2500r/min of a vertical stirrer, and controlling the temperature of the slurry to be 75 ℃ to obtain secondary slurry (the particle size of the material in the secondary slurry is 6000 meshes);
transferring the secondary slurry into a slurry storage barrel, adding calcium hydroxide (the molar ratio of the calcium hydroxide to the magnesium chloride is 1.2: 1), stirring for 1h at the stirring speed of 250r/min, controlling the temperature of the slurry to be 120 ℃ in the stirring process, carrying out liquid phase deposition coating, pumping the obtained slurry into a quick flash evaporation dryer, carrying out flash evaporation drying by adopting clean hot air, collecting the dried material by a cloth bag, and then sending the material into a depolymerization beater to carry out depolymerization beating-up, so as to obtain 6000-mesh composite powder;
adding a composite modifier into the composite powder (1 ton) for surface modification, wherein the composite modifier and the addition amount of the composite modifier are 7 per mill of the mass of the silane coupling agent (R903), 2 per mill of the mass of the sodium stearate and 2 per mill of the mass of the hexadecyl trimethyl ammonium chloride respectively, so as to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler (the particle size of the talcum powder is 2-3 mu m, and the particle size of the nano magnesium hydroxide is 30-50 nm).
Example 3
Mixing 5 tons of talcum powder and magnesium chloride according to the weight ratio of 3: 1, adding water and mixing to obtain first-grade slurry with solid content of 70%;
and (2) feeding the primary slurry into a vertical stirrer, adding a composite dispersant (the mass of sodium dodecyl benzene sulfonate is 4 per mill of the mass of talcum powder, the mass of sodium lignosulfonate is 5 per mill of the mass of talcum powder, and the mass of vinyl acetate-maleic anhydride copolymer sodium is 3 per mill of the mass of talcum powder) for wet grinding, wherein the wet grinding parameters are as follows: stirring for 2h at 2500r/min of a vertical stirrer, and controlling the temperature of the slurry to be 75 ℃ to obtain secondary slurry (the particle size of the material in the secondary slurry is 6000 meshes);
transferring the secondary slurry into a slurry storage barrel, adding calcium hydroxide (the molar ratio of the calcium hydroxide to the magnesium chloride is 1.3: 1), stirring for 1h at the stirring speed of 250r/min, controlling the temperature of the slurry to be 120 ℃ in the stirring process, carrying out liquid phase deposition coating, pumping the obtained slurry into a quick flash evaporation dryer, carrying out flash evaporation drying by adopting clean hot air, collecting the dried material by a cloth bag, and then sending the material into a depolymerization beater to carry out depolymerization beating-up, so as to obtain 6000-mesh composite powder;
adding a composite modifier into the composite powder (1 ton) for surface modification, wherein the composite modifier and the addition amount of the composite modifier are 8 per mill of the mass of the silane coupling agent (R903), 3 per mill of the mass of the sodium stearate and 3 per mill of the mass of the hexadecyl trimethyl ammonium chloride, so as to obtain the talcum powder-magnesium hydroxide composite inorganic flame-retardant filler (the particle size of the talcum powder is 2-3 mu m, and the particle size of the nano magnesium hydroxide is 30-50 nm).
Performance testing
1) The performance indexes of the talc powder-magnesium hydroxide composite inorganic flame-retardant filler prepared in the embodiments 1 to 3 are detected according to GB/T19281-2014, and the results are shown in Table 1:
TABLE 1 technical indexes of talc powder-magnesium hydroxide composite inorganic flame-retardant filler prepared in examples 1 to 3
As can be seen from table 1, the larger the amount of the composite dispersant added to the composite powder prepared in examples 1 to 3 of the present invention is, the better the particle fineness is, and the larger the amount of the composite modifier added is, the higher the particle activation degree is.
2) The talcum powder-magnesium hydroxide composite inorganic flame-retardant filler prepared in the embodiment 1-3 is filled in an EVA cable material, and the formula of the cable material is as follows: 20 parts of EVA (ethylene-vinyl acetate copolymer, model number of basf 6110M), 10 parts of LLDPE (linear low density polyethylene, model number of Saebike 218WJ), 60 parts of talcum powder-magnesium hydroxide composite inorganic flame-retardant filler prepared in examples 1-3 and 5 parts of compatilizer (model number of super light MC 218).
The preparation process of the cable material comprises the following steps: weighing the raw materials according to the formula, mixing and stirring the raw materials uniformly, plasticizing and mixing the obtained mixed material in an open mill at the open milling temperature of 170 ℃ for 15min, pressing the open milled material into a sheet with the required thickness by a tablet press, cutting the pressed sheet into standard sample strips, and testing the oxygen index and the mechanical property of the sample strips according to a conventional method, wherein the results are shown in table 2.
Table 2 data of flame retardance and mechanical properties of cable material obtained by filling talcum powder-magnesium hydroxide composite inorganic flame-retardant filler prepared in examples 1-3 in cable material
As can be seen from Table 2, when the talc powder-magnesium hydroxide composite inorganic flame-retardant filler prepared by the invention is used in a cable material, the obtained cable material has a high oxygen index, which indicates that the composite inorganic flame-retardant filler has good char formation property and high flame-retardant efficiency during combustion, and the obtained cable material has high tensile strength and elongation at break, which indicates that the cable material has excellent mechanical properties, and indicates that the composite inorganic flame-retardant filler of the invention has good compatibility with macromolecules.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A preparation method of talcum powder-magnesium hydroxide composite inorganic flame-retardant filler comprises the following steps:
mixing talcum powder, magnesium chloride and water to obtain primary slurry;
mixing the primary slurry with a composite dispersant, and carrying out wet grinding to obtain secondary slurry;
mixing the secondary slurry with calcium hydroxide, and performing liquid-phase deposition coating to obtain composite powder;
carrying out surface modification on the composite powder to obtain a talcum powder-magnesium hydroxide composite inorganic flame-retardant filler;
the mass ratio of the talcum powder to the magnesium chloride is (3-5): 1;
the molar ratio of the calcium hydroxide to the magnesium chloride is (1-1.3) to 1; the temperature of the liquid phase deposition coating is 110-120 ℃, the liquid phase deposition coating is carried out under the stirring condition, the stirring speed is 250-300 r/min, and the time is 0.8-1 h.
2. The preparation method according to claim 1, wherein the talc powder is prepared from talc raw ore by primary crushing, secondary crushing and dry grinding in this order; the particle size of the talcum powder is 400-600 meshes.
3. The preparation method according to claim 1, wherein the composite dispersant is sodium dodecylbenzene sulfonate, sodium lignin sulfonate and vinyl acetate-maleic anhydride copolymer sodium salt; the mass ratio of the sodium dodecyl benzene sulfonate to the sodium lignin sulfonate to the vinyl acetate-maleic anhydride copolymer sodium salt is (3-5): (4-6): (2-4).
4. The preparation method according to claim 1, wherein the mass ratio of the composite dispersant to the talc powder is (0.009-0.015): 1.
5. The preparation method according to claim 1, wherein the solid content of the primary slurry is 70-80%.
6. The preparation method of claim 1, wherein the wet grinding is performed at a rotation speed of 2500-3000 r/min for 2-2.5 h at a temperature of 75-85 ℃; the grain size of the materials in the secondary slurry is 6000 meshes.
7. The preparation method according to claim 1, wherein the composite modifier for surface modification comprises a silane coupling agent, sodium stearate and cetyltrimethylammonium chloride; the mass ratio of the silane coupling agent to the sodium stearate to the hexadecyl trimethyl ammonium chloride is (6-8) to (1-3); the mass ratio of the composite modifier to the composite powder is (0.008-0.014) to 1.
8. The talcum powder-magnesium hydroxide composite inorganic flame-retardant filler prepared by the preparation method of any one of claims 1 to 7 comprises talcum powder and nano-magnesium hydroxide coated on the surface of the talcum powder, wherein the particle size of the talcum powder is 2-3 μm, and the particle size of the nano-magnesium hydroxide is 30-50 nm.
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| CN101717649B (en) * | 2009-11-13 | 2013-06-12 | 西安电子科技大学 | Preparation method of enhanced magnesium-aluminum composite flame retardant |
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