CN113429631A - Preparation method and application of modified magnesium hydroxide flame retardant - Google Patents
Preparation method and application of modified magnesium hydroxide flame retardant Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
Abstract
The invention discloses a preparation method of a modified magnesium hydroxide flame retardant, dry oil-free compressed air forms high-speed jet flow to drive magnesium hydroxide raw powder to move at high speed, so that the raw powder collides, rubs and crushes, the crushed magnesium hydroxide material reaches a classification area along with air flow, and a collector collects magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m; then putting the crushed magnesium hydroxide fine powder into a high-speed stirrer preheated to 90-110 ℃ for stirring, and spraying a silane coupling agent for modification; then transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifying machine, and spraying a preheated modifying agent for coating treatment; then transferring the magnesium hydroxide fire retardant subjected to secondary coating into a rotary sieve for screening treatment and bagging. The equipment and the process required by the invention are safe and simple, the production cost is lower, no waste water and gas is generated, and the method can be widely applied to industrial production.
Description
Technical Field
The invention relates to the technical field of flame retardants, and particularly relates to a preparation method and application of a modified magnesium hydroxide flame retardant.
Background
The cable industry is second to the second major industry of automobiles in China, and the safety problem of the cable in various industries is improved to an unprecedented level through the gift-washing of the cable with the problem of Oaky issue of the third line of the Xian subway in the last year. As an important component of cable safety, the production of the low-smoke halogen-free cable material also provides new requirements, the material is required to meet the requirements of industrial standards, and various index requirements of the cable are also ensured after the cable is formed. The design and production process of the low-smoke halogen-free material is required to consider not only the flame retardant property and mechanical property of the material, but also various factors in the material forming and processing process and various performance requirements in the actual combustion test of the cable.
Magnesium hydroxide is used as an important inorganic flame retardant material, has triple functions of filling, flame retarding and smoke suppression, generates non-toxic and non-corrosive smoke, and is an environment-friendly green flame retardant. With the stricter environmental protection requirements and the international restricted use of part of brominated and antimonous oxide flame retardants, the green and environmental-friendly magnesium hydroxide flame retardant has very wide application prospects.
Magnesium hydroxide as a flame retardant needs a higher addition amount in the production process of a low-smoke halogen-free cable material to exert excellent flame retardance, smoke suppression and other properties, the addition amount is generally 10-25%, and the high addition amount has great negative effects on physical properties, mechanical properties and the like of a polyethylene material, so that the main defects of the magnesium hydroxide are that the consumption of the flame retardant is large, and the influence on the properties of a base material is great. Meanwhile, the magnesium hydroxide flame retardant has strong polarity, large surface energy, higher moisture absorption capacity and easy agglomeration, and in order to solve the problem, the magnesium hydroxide flame retardant needs to be activated to improve the dispersibility of the magnesium hydroxide flame retardant in the polyethylene base material low-smoke halogen-free cable material, so that the system can ensure the addition of magnesium hydroxide and simultaneously ensure that the cable material has excellent comprehensive performance.
Disclosure of Invention
The invention provides a preparation method and application of a modified magnesium hydroxide flame retardant in order to make up for the defects of the prior art.
The invention is realized by the following technical scheme:
a preparation method of a modified magnesium hydroxide flame retardant comprises the following steps:
pulverizing magnesium hydroxide raw powder, drying oil-free compressed air to form high-speed jet flow to drive the magnesium hydroxide raw powder to make high-speed movement, making the raw powder implement collision and friction to make pulverization, making pulverized magnesium hydroxide material be reached into classification zone along with air flow, collecting magnesium hydroxide fine powder whose magnesium hydroxide grain size D50 is 3.5 micrometer-4.5 micrometer by means of collector;
modification, namely putting the crushed magnesium hydroxide fine powder into a high-speed stirrer preheated to 90-110 ℃ for stirring, and spraying a silane coupling agent for modification;
secondary coating, namely transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifier, and spraying a preheated modifier for coating;
and (4) sieving, namely transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary sieve, wherein the filter screen is 100 meshes, and bagging after sieving treatment.
The stirring speed of the high stirring machine is 720 rpm, and the stirring time is 5-15 min.
The silane coupling agent is one or more of KH550, A172 and KH 570.
The amount of the silane coupling agent is 1-3% by mass.
The reaction temperature of the continuous modification machine in the secondary coating step is 80-90 ℃.
The amount of the modifier is 2% by mass.
The modifier is stearic acid.
A modified magnesium hydroxide flame retardant is prepared by the method.
The application of the modified magnesium hydroxide flame retardant is to prepare a low-smoke halogen-free cable material.
The preparation method of the low-smoke halogen-free cable material comprises the steps of blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, modified magnesium hydroxide flame retardant and aluminum hydroxide according to a proportion, injecting the mixture into an internal mixer for reaction, and reacting at 130 ℃ for 1 hour to obtain the low-smoke halogen-free cable material.
The invention has the following technical effects:
the preparation method of the modified magnesium hydroxide flame retardant has the advantages of safe and simple required equipment and process, lower production cost, no waste water and gas generation and wide application in industrial production. After the magnesium hydroxide flame retardant is treated by the method, the magnesium hydroxide has uniform particle size, hydrophobic surface and good powder flowability, and can improve the mechanical property and flame retardant property of the material when being applied to the production of low-smoke halogen-free cable materials.
Detailed Description
The invention provides a preparation method of a modified magnesium hydroxide fire retardant, which comprises the steps of firstly, spraying dry and oilless compressed air at a high speed through a nozzle, and driving magnesium hydroxide raw powder prepared by a natural ore method to move at a high speed through the high-speed jet so as to lead the raw powder to collide, rub and crush. The crushed magnesium hydroxide material reaches a classification area along with the air flow to reach the material with the fineness requirement, and is finally collected by a collector, and the collected magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m is obtained. The product crushed by the jet mill has the advantages of uniform fineness, narrow particle size distribution, smooth particle surface, regular particle shape, high purity, high activity and good dispersibility. Meanwhile, the production process is continuous, the production capacity is high, and the automatic control and automation degree is high. The production process for physically crushing the magnesium hydroxide with the particle size of below 3.5 mu m is complex and difficult, and the prior particle size control crushing process for the magnesium hydroxide with the particle size of between 3.5 and 4.5 mu m is relatively mature.
Then putting the crushed magnesium hydroxide fine powder into a preheated high-speed stirrer, stirring at 720 rpm for 5-15min at the high temperature of 90-110 ℃, and simultaneously spraying a silane coupling agent for modification treatment, wherein the silane coupling agent is any one or more of KH550, V172 and KH570, and the dosage is 1-3% by mass. The silane coupling agent is an organic silicon compound with a special structure, has the capability of simultaneously reacting with an inorganic material and an organic polymer due to the simultaneous existence of two groups with different chemical properties, can improve the interface compatibility of the two materials, improves various performances of the materials, and is very suitable for surface treatment. The temperature is selected mainly in consideration of the fact that magnesium hydroxide is easy to agglomerate due to moisture absorption, the moisture on the surface of the powder is removed at a higher temperature, and meanwhile, the reaction between the hydrophilic group of the silane coupling agent and the hydroxyl on the surface of the magnesium hydroxide is more sufficient and violent at 90-110 ℃.
And then secondary coating, namely transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifying machine, and spraying preheated modifier stearic acid at the temperature of 80-90 ℃ for coating treatment, wherein the use amount of fatty acid is 2% by mass. The acid carboxyl of the stearic acid reacts with the basic groups on the surface of the magnesium hydroxide, and the generated stearate stays on the surface of the magnesium hydroxide, so that the flowability of the powder material is improved. Stearic acid is solid particles, the melting point is about 67-69 ℃, and stearic acid is completely melted into liquid at 80-90 ℃, so that the reaction degree with powder can be improved.
Finally, screening, namely transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary screen for screening treatment, wherein a filter screen is 100 meshes, and bagging after screening treatment.
The invention also provides a modified magnesium hydroxide flame retardant prepared by the method.
The invention also provides application of the modified magnesium hydroxide flame retardant, wherein the modified magnesium hydroxide flame retardant is used for preparing a low-smoke halogen-free cable material, and linear low-density polyethylene resin, an ethylene-vinyl acetate copolymer, a compatilizer, silicone master batches, the modified magnesium hydroxide flame retardant and aluminum hydroxide are mixed and injected into an internal mixer to react for 1h at the temperature of 130 ℃ to prepare the low-smoke halogen-free cable material. Wherein the addition amount of the modified magnesium hydroxide flame retardant is 9.8% by mass.
The invention is further illustrated by the following specific examples.
Example one
Firstly, the dry and oilless compressed air is sprayed out at a high speed through a nozzle, and the high-speed jet flow drives the magnesium hydroxide raw powder to move at a high speed, so that the raw powder is collided, rubbed and crushed. The crushed magnesium hydroxide material reaches a classification area along with the air flow to reach the material with the fineness requirement, and is finally collected by a collector, and the collected magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m is obtained. And (2) putting the crushed magnesium hydroxide fine powder into a high-temperature stirrer preheated to 90 ℃ for high-temperature stirring, and performing modification treatment by spraying a silane coupling agent KH550, wherein the dosage of the silane coupling agent KH550 is 1%, stirring and reacting for 10min, and the stirring speed is 720 r/min. And transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifying machine, and spraying preheated stearic acid for coating treatment. And (3) transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary sieve at the reaction temperature of 90 ℃ in the continuous modifying machine, wherein the addition amount of stearic acid is 2%, carrying out screening treatment on the magnesium hydroxide flame retardant with a filter screen of 100 meshes, and obtaining a finished product of the magnesium hydroxide flame retardant to be modified after the screening treatment.
After blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, modified magnesium hydroxide flame retardant and aluminum hydroxide, injecting the mixture into an internal mixer for reaction, wherein the reaction temperature of the internal mixer is 130 ℃, the reaction time is 1h, and tabletting the prepared low-smoke halogen-free cable material sample to obtain the low-smoke halogen-free cable material sample. Cutting the sample wafer into dumbbell-shaped sample strips, and testing the tensile strength and the elongation at break; cutting the sample wafer into strips, and testing the oxygen index.
The modified magnesium hydroxide flame retardant and the low-smoke halogen-free cable material have the following formula shown in the table.
Example two
Firstly, the dry and oilless compressed air is sprayed out at a high speed through a nozzle, and the high-speed jet flow drives the magnesium hydroxide raw powder to move at a high speed, so that the raw powder is collided, rubbed and crushed. The crushed magnesium hydroxide material reaches a classification area along with the air flow to reach the material with the fineness requirement, and is finally collected by a collector, and the collected magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m is obtained. And (2) putting the crushed magnesium hydroxide fine powder into a high-temperature stirrer preheated to 100 ℃ for high-temperature stirring, and carrying out modification treatment by spraying a silane coupling agent KH550, wherein the dosage of the silane coupling agent KH550 is 2%, stirring and reacting for 15min, and the stirring speed is 720 r/min. And transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifying machine, and spraying preheated stearic acid for coating treatment. And (3) transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary sieve at the reaction temperature of 90 ℃ in the continuous modifying machine, wherein the addition amount of stearic acid is 2%, carrying out screening treatment on the magnesium hydroxide flame retardant with a filter screen of 100 meshes, and obtaining a finished product of the magnesium hydroxide flame retardant to be modified after the screening treatment.
After blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, modified magnesium hydroxide flame retardant and aluminum hydroxide, injecting the mixture into an internal mixer for reaction, wherein the reaction temperature of the internal mixer is 130 ℃, the reaction time is 1h, and tabletting the prepared low-smoke halogen-free cable material sample to obtain the low-smoke halogen-free cable material sample. Cutting the sample wafer into dumbbell-shaped sample strips, and testing the tensile strength and the elongation at break; cutting the sample wafer into strips, and testing the oxygen index.
The modified magnesium hydroxide flame retardant and the low-smoke halogen-free cable material have the following formula shown in the table.
EXAMPLE III
Firstly, the dry and oilless compressed air is sprayed out at a high speed through a nozzle, and the high-speed jet flow drives the magnesium hydroxide raw powder to move at a high speed, so that the raw powder is collided, rubbed and crushed. The crushed magnesium hydroxide material reaches a classification area along with the air flow to reach the material with the fineness requirement, and is finally collected by a collector, and the collected magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m is obtained. And (2) putting the crushed magnesium hydroxide fine powder into a high-temperature stirrer preheated to 110 ℃ for high-temperature stirring, and carrying out modification treatment by spraying a silane coupling agent KH550, wherein the dosage of the silane coupling agent KH550 is 2%, stirring and reacting for 20min, and the stirring speed is 720 r/min. And transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifying machine, and spraying preheated stearic acid for coating treatment. And (3) transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary sieve at the reaction temperature of 90 ℃ in the continuous modifying machine, wherein the addition amount of stearic acid is 2%, carrying out screening treatment on the magnesium hydroxide flame retardant with a filter screen of 100 meshes, and obtaining a finished product of the magnesium hydroxide flame retardant to be modified after the screening treatment.
After blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, modified magnesium hydroxide flame retardant and aluminum hydroxide, injecting the mixture into an internal mixer for reaction, wherein the reaction temperature of the internal mixer is 130 ℃, the reaction time is 1h, and tabletting the prepared low-smoke halogen-free cable material sample to obtain the low-smoke halogen-free cable material sample. Cutting the sample wafer into dumbbell-shaped sample strips, and testing the tensile strength and the elongation at break; cutting the sample wafer into strips, and testing the oxygen index.
The modified magnesium hydroxide flame retardant and the low-smoke halogen-free cable material have the following formula shown in the table.
Example four
Firstly, the dry and oilless compressed air is sprayed out at a high speed through a nozzle, and the high-speed jet flow drives the magnesium hydroxide raw powder to move at a high speed, so that the raw powder is collided, rubbed and crushed. The crushed magnesium hydroxide material reaches a classification area along with the air flow to reach the material with the fineness requirement, and is finally collected by a collector, and the collected magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m is obtained. Putting the crushed magnesium hydroxide fine powder into a high-temperature stirrer preheated to 100 ℃ for high-temperature stirring, spraying a silane coupling agent KH550 for modification treatment, compounding the silane coupling agent KH550 and V172 according to a ratio of 1:1 for use, stirring for reaction for 15min, and stirring at a rotating speed of 720 r/min. And transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifying machine, and spraying preheated stearic acid for coating treatment. And (3) transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary sieve at the reaction temperature of 90 ℃ in the continuous modifying machine, wherein the addition amount of stearic acid is 2%, carrying out screening treatment on the magnesium hydroxide flame retardant with a filter screen of 100 meshes, and obtaining a finished product of the magnesium hydroxide flame retardant to be modified after the screening treatment.
After blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, modified magnesium hydroxide flame retardant and aluminum hydroxide, injecting the mixture into an internal mixer for reaction, wherein the reaction temperature of the internal mixer is 130 ℃, the reaction time is 1h, and tabletting the prepared low-smoke halogen-free cable material sample to obtain the low-smoke halogen-free cable material sample. Cutting the sample wafer into dumbbell-shaped sample strips, and testing the tensile strength and the elongation at break; cutting the sample wafer into strips, and testing the oxygen index.
Comparative example
Firstly, the dry and oilless compressed air is sprayed out at a high speed through a nozzle, and the high-speed jet flow drives the magnesium hydroxide raw powder to move at a high speed, so that the raw powder is collided, rubbed and crushed. The crushed magnesium hydroxide material reaches a classification area along with the air flow to reach the material with the fineness requirement, and is finally collected by a collector, and the collected magnesium hydroxide fine powder with the particle size D50 of 3.5-4.5 mu m is obtained.
And transferring the magnesium hydroxide fine powder into a rotary sieve, carrying out screening treatment, wherein a filter screen is 100 meshes, and obtaining a required magnesium hydroxide fire retardant finished product after screening treatment.
After blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, magnesium hydroxide and aluminum hydroxide flame retardant, injecting the mixture into an internal mixer for reaction, wherein the reaction temperature of the internal mixer is 130 ℃, the reaction time is 1h, and the prepared low-smoke halogen-free cable material sample is subjected to tabletting treatment to obtain the low-smoke halogen-free cable material sample. Cutting the sample wafer into dumbbell-shaped sample strips, and testing the tensile strength and the elongation at break; cutting the sample wafer into strips, and testing the oxygen index.
The results of comparing the oxygen index, tensile strength and elongation at break of examples 1 to 4 and comparative example are shown in the following table.
| Numbering | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 6 |
| Oxygen index | 21 | 20 | 21 | 22 | 19 |
| Tensile strength | 11.9 | 11.5 | 12.1 | 12.5 | 10.5 |
| Elongation at break | 150 | 159 | 153 | 160 | 86 |
The results of the implementation case and the comparison case show that the magnesium hydroxide flame retardant prepared by crushing, modifying, secondary coating and screening can obviously improve the dispersibility of magnesium hydroxide and also can improve the compatibility of the magnesium hydroxide flame retardant in the low-smoke halogen-free cable material, and the oxygen index, the tensile strength and the elongation at break of the low-smoke halogen-free cable material prepared from the treated magnesium hydroxide flame retardant are greatly improved.
Claims (10)
1. The preparation method of the modified magnesium hydroxide flame retardant is characterized by comprising the following steps:
pulverizing magnesium hydroxide raw powder, drying oil-free compressed air to form high-speed jet flow to drive the magnesium hydroxide raw powder to make high-speed movement, making the raw powder implement collision and friction to make pulverization, making pulverized magnesium hydroxide material be reached into classification zone along with air flow, collecting magnesium hydroxide fine powder whose magnesium hydroxide grain size D50 is 3.5 micrometer-4.5 micrometer by means of collector;
modification, namely putting the crushed magnesium hydroxide fine powder into a high-speed stirrer preheated to 90-110 ℃ for stirring, and spraying a silane coupling agent for modification;
secondary coating, namely transferring the modified magnesium hydroxide flame retardant semi-finished product into a continuous modifier, and spraying a preheated modifier for coating;
and (4) sieving, namely transferring the magnesium hydroxide flame retardant subjected to secondary coating into a rotary sieve, wherein the filter screen is 100 meshes, and bagging after sieving treatment.
2. The method for preparing a modified magnesium hydroxide flame retardant according to claim 1, wherein: the stirring speed of the high stirring machine is 720 rpm, and the stirring time is 5-15 min.
3. The method for preparing a modified magnesium hydroxide flame retardant according to claim 1, wherein: the silane coupling agent is one or more of KH550, A172 and KH 570.
4. The method for preparing a modified magnesium hydroxide flame retardant according to claim 1, wherein: the amount of the silane coupling agent is 1-3% by mass.
5. The method for preparing a modified magnesium hydroxide flame retardant according to claim 1, wherein: the reaction temperature of the continuous modification machine in the secondary coating step is 80-90 ℃.
6. The method for preparing a modified magnesium hydroxide flame retardant according to claim 1, wherein: the amount of the modifier is 2% by mass.
7. The method for preparing a modified magnesium hydroxide flame retardant according to claim 1, wherein: the modifier is stearic acid.
8. A modified magnesium hydroxide flame retardant is characterized in that: prepared by the method of any one of claims 1 to 6.
9. The application of the modified magnesium hydroxide flame retardant is characterized in that: the modified magnesium hydroxide flame retardant is applied to preparation of low-smoke halogen-free cable materials.
10. Use of a modified magnesium hydroxide flame retardant according to claim 8, characterized in that: the preparation method of the low-smoke halogen-free cable material comprises the steps of blending linear low-density polyethylene resin, ethylene-vinyl acetate copolymer, compatilizer, silicone master batch, modified magnesium hydroxide flame retardant and aluminum hydroxide according to a proportion, injecting the mixture into an internal mixer for reaction, and reacting at 130 ℃ for 1 hour to obtain the low-smoke halogen-free cable material.
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|---|---|---|---|---|
| CN114395171A (en) * | 2022-01-19 | 2022-04-26 | 河南强宏镁业科技股份有限公司 | Flame-retardant modified magnesium hydroxide and preparation method thereof |
| CN115287652A (en) * | 2022-08-18 | 2022-11-04 | 扬州大学 | Erosion-resistant cavitation-resistant high-entropy alloy-based coating and preparation method thereof |
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| JP2006111677A (en) * | 2004-10-13 | 2006-04-27 | Nippon Unicar Co Ltd | Whitening resistant flame retardant resin composition, extruded article thereof and wire/cable having coating layer obtained by extruding the same |
| CN101067085A (en) * | 2007-06-15 | 2007-11-07 | 海城精华矿产有限公司 | Prepn of natural magnesium hydroxide for inorganic no-halogen fire retardant |
| CN101434713A (en) * | 2008-12-19 | 2009-05-20 | 周到 | Flame retardant and use thereof in polymer modification |
| US20160264868A1 (en) * | 2013-10-29 | 2016-09-15 | Otkrytoe Aktsionernoe Obshchestvo "Kaustik" | Nanoparticles of flame retardant magnesium hydroxide and method of production the same |
| CN103665939A (en) * | 2013-12-27 | 2014-03-26 | 江苏艾特克阻燃材料有限公司 | Method for integrally preparing high-dispersity ultrafine magnesium hydroxide flame retardant |
| CN104592789A (en) * | 2013-12-27 | 2015-05-06 | 江苏艾特克阻燃材料有限公司 | Method for preparing magnesium hydrate flame retardant |
| CN112759823A (en) * | 2020-12-29 | 2021-05-07 | 金发科技股份有限公司 | Irradiation crosslinking low-smoke halogen-free polyolefin cable material and preparation method and application thereof |
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| CN114395171A (en) * | 2022-01-19 | 2022-04-26 | 河南强宏镁业科技股份有限公司 | Flame-retardant modified magnesium hydroxide and preparation method thereof |
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