CN104592789A - Method for preparing magnesium hydrate flame retardant - Google Patents
Method for preparing magnesium hydrate flame retardant Download PDFInfo
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- CN104592789A CN104592789A CN201410827933.8A CN201410827933A CN104592789A CN 104592789 A CN104592789 A CN 104592789A CN 201410827933 A CN201410827933 A CN 201410827933A CN 104592789 A CN104592789 A CN 104592789A
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Abstract
The invention discloses a method for preparing a magnesium hydrate flame retardant. The method comprises the following steps: continuously synthesizing high-purity magnesium hydrate; carrying out single-cycle wet grinding and surface modification on magnesium hydrate so as to integrally implement grain diameter control and surface treatment of magnesium hydrate flame retardant. According to the method, the technical problems of magnesium hydrate flame retardant purity, slurry viscosity, grain diameter, grain diameter distribution and specific surface area control, as well as secondary agglomeration, adhesion and the like happening during drying can be solved, the magnesium hydrate flame retardant powder is modified from hydrophilic surface to lipophilic surface, the intermiscibility and dispersibility of the powder in a high-molecular polymeric material can be improved, the influence of the powder for polymer product processing performance and mechanical performance can be reduced, the comprehensive performances of flame retardance, processing, mechanics, electrics and the like of high-molecular polymers can be optimized.
Description
Technical field
The present invention relates to flame retardant of magnesium hydroxide preparation field, particularly relate to the method for a kind of integration system for high-dispersity ultrafine magnesium hydroxide flame.
Background technology
The trend of 21 century International flame retardant development is just towards the future development of environmental protection, the low fuming of low toxicity, high efficiency, multifunction, and external many countries have limited the production and the use that environment are had to the fire retardant of pollution.Europe has started the sale limiting halogen containing flame-retardant, and Japan prohibits the use during cable fire and produces sour gas fire retardant, and the U.S. has formulated the regulation of employing low halogen cable coating layer.Along with the fast development that China's economic is built, to the raising that safety performance requires, people are on green, the attention of environmental protection and the impact of other various factors, the state-of-the-art facilitys such as many Highrise buildingss, subway, tunnel, Nuclear power plants, boats and ships all require to adopt low-smoke halogen-free flame-retardant electric wire and cable, increasing to the demand of low-smoke halogen-free flame-retardant electric wire and cable.Electric cable material with low smoke and halogen free industry attracts increasing enterprises pay attention, and numerous domestic producer all goes into overdrive to develop electric cable material with low smoke and halogen free.Due to the market of China own and demand in line with international standards, fire retardant is changed from the non-environment-friendly type of halogen to halogen-free environment-friendly type flame-proof agent.
Magnesium hydroxide meets with its superior flame retardant properties the needs that current fire retardant develops to environment-friendly type completely, and it belongs to human health and environmentally friendly inorganic non-halogen flame retardant, and the sector is classified as novel strategic industry by country.Magnesium hydroxide have fire-retardant, eliminate smoke, resistance is dripped, the multiple performance such as filling, fire-retardant, environmental protection, medicine and ceramic etc. in have a wide range of applications, own through being deep into the every field of national economy.Along with the continuous progress of society, the requirement of people to novel material improves constantly, and the quality index of magnesium hydroxide products not only rests in initial product purity, it is also proposed higher requirement to product form and size-grade distribution.
It is the direct comminuting method of brucite that the method for current production magnesium hydroxide mainly contains two kinds: one; Two is containing magnesium raw material reaction conversion method.Due to the direct comminuting method of brucite, many defects etc. such as high by brucite foreign matter content, whiteness is low affect, and its product can only use as low side flame retardant of magnesium hydroxide.And compositional rule by controlling differential responses condition, can prepare the magnesium hydroxide products of different size, therefore, synthesis method is the main method of producing now high-end magnesium hydroxide.The large-grain magnesium hydroxide that directly synthesis median size is greater than 10 μm is mainly contained in prior art, and small-particle or super fine magnesium hydroxide that direct synthesis median size is less than 10 μm.The former major advantage is easy filtration washing, and flow process is short and cost is low, but directly can not use as fire retardant, needs secondary processing.And the latter can directly use as flame retardant of magnesium hydroxide, but easily reunite or gelation, cause filtration washing difficulty and production cost high, it is global problem that super fine magnesium hydroxide filters.
The natural character presenting " hydrophilic oleophobic " in flame retardant of magnesium hydroxide surface, if with not surface treated magnesium hydrate powder filled polymer material, be difficult to disperse equably in organic polymer, other performance (as mechanical property and the processing characteristics etc.) severe exacerbation of polymer materials, therefore, surface modification must be carried out to magnesium hydroxide, to change the surface properties of its natural " hydrophilic oleophobic ", improve the consistency of itself and polymkeric substance, reduce it and even make them increase on the impact of polymeric articles processing characteristics and mechanical property.Existing Technology mainly adopts dry method modification, and the method is compared with wet method, and energy consumption is high, and technical process is complicated.
According to consulting current domestic and foreign literature report and patent, the grinding of magnesium hydroxide wet cake (or magnesium hydroxide slurry) and modification are to two parts independently carry out.On the one hand, in multi cycle wet grinding production process, high phosphoric acid easily causes recycle pump often to block in working cycle, makes troubles to production.In order to avoid this accident occurs, only has reduction pulp density, general magnesium hydroxide slurry concentration, between 15-30%, on the other hand, needs to add dispersion agent in multi cycle wet grinding process, reduce the viscosity of magnesium hydroxide slurry in wet grinding process, meet after processing requirement until particle diameter, carry out filtration and deviate from part water, obtain wet cake water ratio 55%, and then carry out surface modification, final drying.Such technical process obviously complicated, cost raise and due to influence factor too much, product performance are difficult to ensure.
Summary of the invention
The object of this invention is to provide the method for a kind of integration system for high-dispersity ultrafine magnesium hydroxide flame, magnesium hydroxide, Ultra-fine control and surface modification integration will be synthesized, to solve the control of flame retardant of magnesium hydroxide purity, slurry viscosity, particle diameter, size distribution and specific surface area, the technical barriers such as the secondary aggregation occurred time dry and bonding phenomenon, and the natural character presenting " hydrophilic oleophobic " in flame retardant of magnesium hydroxide surface.
For solving the problem, the present invention by the following technical solutions:
The preparation method of this flame retardant of magnesium hydroxide, will synthesize magnesium hydroxide, Ultra-fine control and surface modification integration, comprise the steps:
Step one, respectively preparation inorganic magnesium salt solution and alkaline solution, Mg
2+substance withdrawl syndrome is 0.5 ~ 5mol/L, OH
-substance withdrawl syndrome is 0.02 ~ 10mol/L;
Step 2, isopyknic described inorganic magnesium salt solution and alkaline solution are heated to 35 ~ 60 DEG C respectively, join in closed reaction vessel with the flow velocity of 10 ~ 500ml/min simultaneously, constantly stir and be no less than 10min and synthesize magnesium hydroxide slurry; Wherein, control that temperature in described reaction vessel is 60 ~ 100 DEG C, stirring velocity is 50 ~ 1500rpm;
Step 3, proceed in digestion tank by described magnesium hydroxide slurry, at 60 ~ 100 DEG C, ageing is no less than 20min, and through filtering, washing obtains magnesium hydroxide wet cake; Described magnesium hydroxide wet cake moisture is 40wt% ~ 50wt%, hydroxide Mg content≤99wt% in solid matter;
Step 4, described magnesium hydroxide wet cake and silane modifier, grinding spheroid joined grinding in controlling wet-type finishing machine and be no less than 20min, afterwards through filtering, drying obtains high-dispersity ultrafine magnesium hydroxide flame; Wherein, described silane modifier add-on is 0.1 ~ 10wt% of magnesium hydroxide wet cake; The filling ratio of described grinding spheroid in described controlling wet-type finishing machine is 50 ~ 80%; Described grinding sphere diameter is respectively 3mm, 1mm, 0.5mm, and the quality proportioning between described different grinding spheroid is 1 ~ 5:3 ~ 6:2 ~ 3.
Preferably, described silane modifier is RSiX
3in one or more, in formula, R is amino, sulfydryl, vinyl, epoxy group(ing), cyano group or methacryloxy, and X is halogen, alkoxyl group or acyloxy.
Preferably, step 4 is also included in controlling wet-type finishing machine and adds stearic acid or oleic acid and magnesium hydroxide wet cake, silane modifier co-ground, and the add-on of described stearic acid or oleic acid is 0.1 ~ 5wt% of magnesium hydroxide wet cake.
Beneficial effect of the present invention:
1, the present invention solves the control problem of magnesium hydroxide purity and granulation uniformity at magnesium hydroxide slurry synthesis phase, the water content of magnesium hydroxide wet cake is made to be reduced to 40 ~ 50%, magnesium hydroxide content raises, for follow-up grinding and modification procedure carry out providing basis smoothly.
2, magnesium hydrate powder is in process of lapping, and its surface atom is in advanced activation state, the dispersion energy that surface energy is very large and lower, and between powder, easy conglomerate, not only filtration difficulty, cause subsequent technique very complicated.The inventive method adopts single loop wet grinding and surface modification magnesium hydroxide to combine, by groping reasonably to grind spheroid proportioning, and at impurity such as grinding stage no longer additional introducing dispersion agent etc., a step completes the particle diameter of flame retardant of magnesium hydroxide, size distribution, the control of specific surface area and surface modification.
3, by choose reasonable properties-correcting agent, not only suppress the rising of magnesium hydroxide slurry viscosity in process of lapping, also increase substantially the filtering rate of magnesium hydroxide, the water ratio of modified magnesium hydroxide is down to from about 50% and is less than 30%, significantly reduce energy consumption and the cost of subsequent drying step.And, make magnesium hydroxide have good hydrophobicity and dispersiveness, the secondary aggregation occurred when breaching drying and a bonding technology difficult problem, do not need after product drying to carry out pulverizing and sieve, shortening technical process, improve productivity effect.
4, adopt single or multiple surperficial modified magnesium hydroxide, grinding and modified product are not reunited completely, and surface coating rate reaches more than 99.9%, and the coupling activity of powder to polymer base material reaches 100%.Consistency between organic polymer in solution system/magnesium hydroxide inorganic filler component interface, ensures that flame retardant of magnesium hydroxide is in macromolecular material, can not only reach fire-retardant and smoke suppressing effect, and less on the performance index impact of macromolecular material.Rheological when improving Product processing and dispersiveness, improve flame retardant properties and the mechanical strength of material, optimizing product quality and performance.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
Embodiment
Below in conjunction with embodiment the present invention done and further explain.Specific embodiment is intended to describe the present invention in more detail below.The object of these embodiments is to explain the present invention, and should not be construed as limiting the scope of the invention.
The invention provides a kind of method of magnesium hydroxide size controlling and modification, and utilize preceding method integration system for high-dispersity ultrafine magnesium hydroxide flame.It is worth mentioning that, the thinking of design of the present invention and prior art is runed counter to, the problem that prior art blocks in order to avoid magnesium hydroxide slurry and reduce the concentration of slip, the present invention needs the pulp density improving grinding to reach 35-60%, also can improve grinding single device efficiency and throughput with this.By directly adding surface-modifying agent in process of lapping, do not need to add dispersion agent, can avoid again blocking in process, shortened process, significantly reduces production cost.
The preparation method of flame retardant of magnesium hydroxide of the present invention, comprises the steps, shown in composition graphs 1:
Step one, respectively preparation inorganic magnesium salt solution and alkaline solution.
Wherein, inorganic magnesium salt can adopt the water-soluble salts such as such as magnesium chloride, magnesium sulfate, magnesium nitrate.The Mg of preparation
2+substance withdrawl syndrome scope is 0.5 ~ 5mol/L.
The alkaline solution that the present invention adopts is ammoniacal liquor, control OH
-substance withdrawl syndrome scope be 0.02 ~ 10mol/L.Certainly, adopt other common mineral alkalis such as sodium hydroxide, potassium hydroxide etc. also can reach the object of the invention, but need flow velocity and concentration to adding alkali to do strict control.Adopt ammoniacal liquor and Mg
2+the Mg (OH) formed
2it is lower that deposit seeds is unlikely to magnesium hydroxide slurry water content that is too thin, that obtain.So the parameter such as grain diameter, magnesium hydroxide wet cake water content of comprehensive synthesis magnesium hydroxide slurry is considered, ammoniacal liquor preferably selects.But, because ammoniacal liquor is weak base, exist ionization equilibrium process (at 25 DEG C, K=1.8 × 10
-5), so the process need of preparation alkaline solution fully takes into account the ionization constant of alkaline solution.
Step 2, inorganic magnesium salt solution step one prepared and alkaline solution are heated to 35 ~ 60 DEG C respectively, afterwards the inorganic magnesium salt solution of same volume and alkaline solution are added in closed reaction vessel with the flow velocity of 10 ~ 500ml/min simultaneously, constantly stir the magnesium hydroxide slurry of 10 ~ 30min synthesis.Wherein, controlling reaction vessel temperature is 60 ~ 100 DEG C, and stirring velocity is 50 ~ 1500rpm.Root changes the stirring velocity of its reinforced flow velocity and reaction vessel, controls crystal nucleation and growth conditions; The magnesium hydroxide slurry of synthesis stays Shi Jian≤10min at the Ting of reaction vessel, play the effect adding crystal seed, accelerate the agglomeration of magnesium hydroxide crystal and grow up, overcoming particle in prior art uneven, the overall dimensions of crystal grain and the unmanageable defect of particle size.Mg (OH) in the magnesium hydroxide slurry of step 2 synthesis
2size D50=5 ~ 50 μm.Particle diameter corresponding when the cumulative particle sizes percentile that D50 represents a sample reaches 50%.Its physical significance is that the particle that particle diameter is greater than it accounts for 50%, and the particle being less than it also accounts for 50%, D50 and is also meso-position radius or median particle diameter.
Step 3, magnesium hydroxide slurry step 2 obtained proceed in digestion tank, ageing 20 ~ 30min at 60 ~ 100 DEG C, and repeatedly filter with distilled water, wash repeatedly afterwards, the impurity in removal magnesia slurry is (as NH
4 +, Cl
-, Fe
3+deng) obtain magnesium hydroxide wet cake.Wherein, obtaining described magnesium hydroxide wet cake moisture is 40wt% ~ 50wt%, and in solid matter, magnesium hydroxide content is not less than 99wt%.The magnesium hydroxide wet cake particle diameter obtained by step one to three successive reactions is like this in D50=5 ~ 50 μm.Whole technical process is simple, and processing parameter easily controls, the magnesium hydroxide wet cake uniform particles of acquisition, and purity and the magnesium rate of recovery all very high.
Step 4, magnesium hydroxide wet cake step 3 obtained and silane modifier, grinding spheroid join controlling wet-type finishing machine and (can consult utility model patent, application number is: grinding 20 ~ 30min 201220005662.4), obtain the superfine modified magnesium hydroxide of polymolecularity through filtration, drying more afterwards, be flame retardant of magnesium hydroxide finished product.Magnesium hydroxide self friction heat-dissipating in process of lapping, temperature remains on about 50 DEG C.
Wherein, silane modifier add-on is the 0.1-10wt% of magnesium hydroxide wet cake.In the invention process process, owing to reducing the water content (namely improve the content of magnesium hydroxide composition) of magnesium hydroxide wet cake (enter in mill and be also called magnesium hydroxide slurry), its viscosity also increases, and is unfavorable for carrying out smoothly of production.For reducing the viscosity of magnesium hydroxide slurry, realized by silane modifier too.So the selection of this silane modifier is very crucial, namely requires that it not only has surface modification function, but also has the effect of dispersion agent.It is RSiX that the present invention have chosen several silane modifier
3in one or more, in formula, R is the groups such as amino, sulfydryl, vinyl, epoxy group(ing), cyano group or methacryloxy, and these groups and different matrix resins all have stronger response capacity; X is halogen, alkoxyl group or acyloxy etc.Silane modifier concrete example is as 3-(2,3-epoxy third oxygen) propyl trimethoxy silicane (C
9h
20o
5si), 3-aminopropyltriethoxy diethoxy silane (C
8h
21nO
2si, vinyltriethoxysilane (C
8h
18o
3si), 3-(methacryloxypropyl) propyl trimethoxy silicane (C
10h
20o
5si).By adding one or more different silane modifiers, achieving (1) magnesium hydroxide slurry viscosity and being reduced to being less than 107.5cst (normal temperature measurement) from being greater than 4000cst; (2) hydrophobicity improves, and its contact angle is brought up to be greater than 90 ° from being less than 10 °; Lipophilic degree value is less than 0.06, and fat absorption is less than 0.7; Activation index is greater than 99%, and powder characteristic test is shown as free-flowing powder body.(3) filter factor is reduced to 624cm/sec from 4990cm/sec.The water content finally obtaining modified magnesium hydroxide (before non-drying) is nearly less than 30% from about 40 ~ 50%.
The material of grinding spheroid commonly uses zirconium white spheroid, and its diameter is respectively 3mm, 1mm, 0.5mm, and quality proportioning is 1 ~ 5:3 ~ 6:2 ~ 3.The filling ratio of described grinding spheroid in described controlling wet-type finishing machine is 50 ~ 80% (volume ratios), and remaining space and gap are as the volume of magnesium hydroxide slurry.This step adopts single loop wet grinding and surface modification synchronously to carry out, by the size controlling of flame retardant of magnesium hydroxide and surface treatment total implementation.By regulating the proportioning of grinding packing medium different diameter zirconium white spheroid, the particle diameter, size distribution and the specific surface area that control modified magnesium hydroxide can be reached.Generally, the particle diameter of magnesium hydroxide is less, and the filling ratio of grinding spheroid is higher.By changing the proportioning of zirconium white spheroid, single loop realizes D50=0.1 ~ 6.0 μm and specific surface area at 4 ~ 10m
2the flame retardant of magnesium hydroxide of/g different size.What deserves to be explained is, adopt the grinding of single a kind of ball milling diameter not only difficulty meet size distribution profile, and must be repeatedly that circular grinding just can reach technique effect of the present invention, cost is high, the cycle longly well imagines.
For the demand of satisfied different high molecular polymer base material, can also add stearic acid or oleic acid etc. and magnesium hydroxide wet cake and silane modifier co-ground in process of lapping, the add-on of described stearic acid or oleic acid is 0.1 ~ 5wt% of magnesium hydroxide wet cake.Adopt multiple properties-correcting agent composite, meet the requirement of the mechanical property after high molecular polymer base material interpolation magnesium hydroxide, flame retardant properties, electric property, processing characteristics simultaneously.
In addition, step 4 of the present invention also can be applied independently in size controlling and the modification aspect of magnesium hydroxide, and the magnesium hydroxide wet cake namely obtained for additive method also obtains modified magnesium hydroxide by the method for grinding, surface modification integration.
The present invention adopts single loop wet grinding to combine with surface modification magnesium hydroxide, while the control completing magnesium hydroxide particle diameter, size distribution and specific surface area, carries out hydrophobic treatment to the particle surface of magnesium hydroxide.Due to adding of silane modifier, not only suppress the rising of magnesium hydroxide slurry viscosity in process of lapping and increased substantially the filtering rate of magnesium hydroxide, and, magnesium hydroxide is made to have good hydrophobicity and dispersiveness, breach the difficult problem such as secondary aggregation, bonding when magnesium hydrate powder is dry, effectively improve the dispersiveness of its powder in polymeric material and consistency.In process of production without the need to adding powder bale breaking equipment and powder filter screen, as long as select flash drying equipment, the effect of original multiple devices just can be reached.
Several specific embodiment is provided to describe in detail the present invention below:
As shown in table 1, embodiment 1 ~ 4 is all propose preferred embodiment in the technical scheme that the present invention is feasible, and its flame retardant of magnesium hydroxide obtained has excellent properties (see table 2).
Table 1 embodiment 1 ~ 4 prepares parameters or the index of flame retardant of magnesium hydroxide
As known from Table 1, embodiment 1 ~ 4 obtains magnesium hydroxide wet cake uniform particles, and D50 is at 5 ~ 50 μm.The product that the known embodiment 1 ~ 4 of associative list 2 obtains is not reunited completely, and surface coating rate all reaches more than 99.9%.The product that embodiment 1 ~ 4 obtains is filled in EVA+PE base material, polyurethane base material, olefin polymer base material, unsaturated polyester base material respectively, the coupling activity of powder to base material reaches 100%, substantially improve the dispersiveness of magnesium hydroxide in EVA+PE, bounding force, the consumption factor and inductance capacitive reactance, and enhance the interfacial adhesion of flame retardant of magnesium hydroxide and base material, improve the reinforcement ability of product to different substrate materials, realize the maximization of processing, flame retardant properties, mechanics and electric property.
Table 2 embodiment 1 ~ 4 obtains the various performance parameters of product
These are only preferred case study on implementation of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a preparation method for flame retardant of magnesium hydroxide, is characterized in that, will synthesize magnesium hydroxide, Ultra-fine control and surface modification integration, and comprise the steps:
Step one, respectively preparation inorganic magnesium salt solution and alkaline solution, Mg
2+substance withdrawl syndrome is 0.5 ~ 5mol/L, OH
-substance withdrawl syndrome is 0.02 ~ 10mol/L;
Step 2, isopyknic described inorganic magnesium salt solution and alkaline solution are heated to 35 ~ 60 DEG C respectively, join in closed reaction vessel with the flow velocity of 10 ~ 500ml/min simultaneously, constantly stir and be no less than 10min and synthesize magnesium hydroxide slurry; Wherein, control that temperature in described reaction vessel is 60 ~ 100 DEG C, stirring velocity is 50 ~ 1500rpm;
Step 3, proceed in digestion tank by described magnesium hydroxide slurry, at 60 ~ 100 DEG C, ageing is no less than 20min, and through filtering, washing obtains magnesium hydroxide wet cake; Described magnesium hydroxide wet cake moisture is 40wt% ~ 50wt%, hydroxide Mg content≤99wt% in solid matter;
Step 4, described magnesium hydroxide wet cake and silane modifier, grinding spheroid joined grinding in controlling wet-type finishing machine and be no less than 20min, afterwards through filtering, drying obtains high-dispersity ultrafine magnesium hydroxide flame; Wherein, described silane modifier add-on is 0.1 ~ 10wt% of magnesium hydroxide wet cake; The filling ratio of described grinding spheroid in described controlling wet-type finishing machine is 50 ~ 80%; Described grinding sphere diameter is respectively 3mm, 1mm, 0.5mm, and the quality proportioning between described different grinding spheroid is 1 ~ 5:3 ~ 6:2 ~ 3.
2. the preparation method of flame retardant of magnesium hydroxide according to claim 1, it is characterized in that, described silane modifier is RSiX
3in one or more, in formula, R is amino, sulfydryl, vinyl, epoxy group(ing), cyano group or methacryloxy, and X is halogen, alkoxyl group or acyloxy.
3. the preparation method of flame retardant of magnesium hydroxide according to claim 1 and 2, it is characterized in that, step 4 is also included in controlling wet-type finishing machine and adds stearic acid or oleic acid and magnesium hydroxide wet cake, silane modifier co-ground, and the add-on of described stearic acid or oleic acid is 0.1 ~ 5wt% of magnesium hydroxide wet cake.
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| CN106366700A (en) * | 2016-08-31 | 2017-02-01 | 合肥中科阻燃新材料有限公司 | Wet preparation method of magnesium hydrate flame retardant |
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| CN106349764A (en) * | 2016-08-31 | 2017-01-25 | 合肥中科阻燃新材料有限公司 | Method for efficiently preparing modified magnesium hydroxide fire retardant through low-grade brucite |
| CN106366700A (en) * | 2016-08-31 | 2017-02-01 | 合肥中科阻燃新材料有限公司 | Wet preparation method of magnesium hydrate flame retardant |
| CN106349764B (en) * | 2016-08-31 | 2018-05-18 | 合肥中科阻燃新材料有限公司 | A kind of low-grade shepardite high efficiency prepares modified magnesium hydroxide flame retardant agent method |
| CN106366700B (en) * | 2016-08-31 | 2019-03-01 | 合肥中科阻燃新材料有限公司 | A kind of flame retardant of magnesium hydroxide wet preparation method |
| CN107541189A (en) * | 2017-08-22 | 2018-01-05 | 郑州威源新材料有限公司 | A kind of production method for ensureing that fused alumina zirconia abrasive grain composition is stable |
| CN114456620A (en) * | 2021-06-25 | 2022-05-10 | 合肥中科阻燃新材料有限公司 | Ball milling method for producing superfine magnesium hydroxide fire retardant and preparation method thereof |
| CN114456620B (en) * | 2021-06-25 | 2024-03-19 | 合肥中科阻燃新材料有限公司 | Superfine magnesium hydroxide flame retardant produced by ball milling method and preparation method thereof |
| CN113583296A (en) * | 2021-07-14 | 2021-11-02 | 营口理工学院 | Modified magnesium hydroxide, flame retardant, preparation and application thereof |
| CN113583296B (en) * | 2021-07-14 | 2023-01-24 | 营口理工学院 | Modified magnesium hydroxide, flame retardant, preparation and application thereof |
| CN113429631A (en) * | 2021-07-19 | 2021-09-24 | 山东晨旭新材料股份有限公司 | Preparation method and application of modified magnesium hydroxide flame retardant |
| CN114410128A (en) * | 2022-01-29 | 2022-04-29 | 辽宁鑫阳新材料科技有限公司 | Magnesium hydroxide ultra-fining and surface modification method and application thereof |
| CN115744945A (en) * | 2022-11-23 | 2023-03-07 | 中南大学 | Continuous preparation method of magnesium hydroxide with controllable hydrophobicity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103665939A (en) | 2014-03-26 |
| CN104592789B (en) | 2018-12-04 |
| CN104592790A (en) | 2015-05-06 |
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