CN114672099B - Magnesium hydroxide master batch and preparation method and application thereof - Google Patents
Magnesium hydroxide master batch and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a magnesium hydroxide master batch and a preparation method and application thereof, and belongs to the technical field of thermoplastics. The magnesium hydroxide master batch comprises the following components in parts by weight: 15-45 parts of polypropylene; 50-70 parts of magnesium hydroxide; 5-15 parts of synergistic flame retardant, 1-6 parts of surfactant, 0.1-0.5 part of antioxidant and 0.1-0.5 part of lubricant, wherein the surfactant is a surfactant containing amino, alkyl and hydroxyl, and the antioxidant is phosphite antioxidant and/or thioester antioxidant. According to the magnesium hydroxide master batch disclosed by the invention, the surface of magnesium hydroxide is coated and modified by the surfactant containing amino, alkyl and hydroxyl, so that the compatibility of magnesium hydroxide and polypropylene resin is increased, the mechanical property of the magnesium hydroxide master batch applied to plastic products is effectively improved, and the color change problem of the magnesium hydroxide master batch is more favorably improved.
Description
Technical Field
The invention relates to the technical field of thermoplastic plastics, in particular to a magnesium hydroxide master batch and a preparation method and application thereof.
Background
Compared with the organic flame retardant, the magnesium hydroxide is an additive type efficient smoke-suppressing flame retardant, does not generate a large amount of toxic and harmful gas in a fire scene, and can neutralize acid corrosion gas generated in the combustion process, thereby being convenient for people to escape and receiving extensive attention. Magnesium hydroxide has the characteristics of no toxicity, no halogen, smoke suppression, low price, high temperature resistance and the like, and is widely used as an environment-friendly inorganic additive flame retardant. However, the magnesium hydroxide has low flame retardant efficiency as a flame retardant, more than 60% of the magnesium hydroxide is needed to be added to endow the high polymer material with a good flame retardant effect, and the surface of the magnesium hydroxide powder has more hydrophilic and strong hydroxyl groups and has high surface charge, so that the surface of the powder has strong polarity, and the magnesium hydroxide is easy to agglomerate for a second time during processing, so that the magnesium hydroxide is difficult to disperse uniformly in a polymer. In addition, the magnesium hydroxide particles are irregular in crystal form and difficult to uniformly disperse, so that the addition of a large amount of magnesium hydroxide flame retardant can cause the deterioration of the mechanical property and the processing property of the polymer material, and meanwhile, the material is easy to change color, so that the popularization and the use of the magnesium hydroxide in the polymer material are limited.
The prior art discloses a preparation method of a modified magnesium hydroxide flame retardant, and the flame retardant property of the magnesium hydroxide is improved by carrying out surface modification on common magnesium hydroxide. However, the problems of serious decrease of mechanical properties of materials and easy discoloration in the processing process caused by poor compatibility with polymers in magnesium hydroxide master batches are not solved yet.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of poor dispersibility, poor compatibility with polymers and large chromatic aberration change of the existing magnesium hydroxide master batch, and provides the magnesium hydroxide master batch.
The invention also aims to provide a preparation method of the magnesium hydroxide master batch.
The invention also aims to provide an application of the magnesium hydroxide master batch in preparing modified plastic products.
The above object of the present invention is achieved by the following technical scheme:
the magnesium hydroxide master batch comprises the following components in parts by weight:
15-45 parts of polypropylene; 50-70 parts of magnesium hydroxide; 5 to 15 parts of synergistic flame retardant, 1 to 6 parts of surfactant, 0.1 to 0.5 part of antioxidant, 0.1 to 0.5 part of lubricant,
the surface activator is a surface activator containing amino, alkyl and hydroxyl,
the antioxidant is phosphite antioxidant and/or thioester antioxidant.
The following description is needed:
because of the large number of hydroxyl groups on the surface of magnesium hydroxide, the affinity with lipophilic polymer molecules is poor, secondary agglomeration tends to occur, and the dispersibility and compatibility of magnesium hydroxide are poor. The magnesium hydroxide master batch is added with the surfactant containing amino, alkyl and hydroxyl, and the interaction between the amino and the hydroxyl can effectively coat the magnesium hydroxide, so that the compatibility of the magnesium hydroxide and polypropylene resin is increased, and the mechanical properties of the magnesium hydroxide master batch applied to plastic products, such as impact strength and elongation at break, are also effectively improved.
Because magnesium hydroxide is extremely basic, it is easy to react with hindered phenolic antioxidants, such as antioxidant 1010, to form a chromogenic group of quinoid structure, resulting in serious yellowing of the material. The magnesium hydroxide master batch does not contain hindered phenol antioxidants, especially symmetrical hindered phenol antioxidants, so that the color change condition of the magnesium hydroxide master batch is greatly reduced.
The antioxidant is phosphite antioxidant and/or thioester antioxidant, and is more beneficial to reducing the discoloration of magnesium hydroxide master batch.
The polypropylene of the present invention may be one or more of homo-polypropylene, propylene-ethylene block copolymer, propylene-ethylene random copolymer and propylene-1-butene random block copolymer.
The synergistic flame retardant of the present invention may be one or a mixture of two or more of melamine phosphate, melamine pyrophosphate, melamine polyphosphate and melamine cyanurate.
The lubricant of the invention can be one or more of calcium stearate (CaSt), zinc stearate, stearic acid, magnesium stearate and Ethylene Bis Stearamide (EBS).
Preferably, the surfactant is 2-8% of the mass content of the magnesium hydroxide.
Further preferably, the surfactant is 3-5% of the mass content of magnesium hydroxide.
The usage amount of the surfactant needs to consider the coating effect on the magnesium hydroxide filler, if the usage amount is too small, the coating effect is poor, the magnesium hydroxide filler cannot be completely coated, the compatibility of the filler and resin is affected, the partial compatibility is poor, the mechanical property of the modified polypropylene material is finally affected, the toughness and impact property of the material are improved to a limited extent, the elongation at break is low, and meanwhile, the yellowing property of the material is also affected due to incomplete coating. Also, too much surfactant is used to increase the coating amount, so that the coating thickness of the filler surface is too thick, the binding force with resin is poor, and finally the mechanical properties of the material, such as the tensile strength, are affected, meanwhile, the uneven coating of magnesium hydroxide is also caused, part of the magnesium hydroxide is thicker in coating, and part of the magnesium hydroxide is thinner in coating, and is easily damaged in the subsequent processing process, so that the yellowing of the material is caused, and the yellowing performance and the surface smoothness of the material are affected.
In still other specific embodiments, the surfactant is preferably one or more of N.N-bis-hydroxyethyl alkylamide, ethoxylated amide wax, ethoxylated amide stearate wax, modified bis-stearamide in order to further optimize the surface coating modification effect.
Still more preferably, the surfactant is N.N-bis-hydroxyethyl alkyl amide.
Preferably, the antioxidant is a thioester antioxidant.
The addition of the thioester antioxidant is beneficial to improving the color, the formation of the quinoid structure cannot be promoted because the thioester antioxidant does not contain phenolic hydroxyl groups, and the thioester antioxidant is beneficial to removing the hydroperoxide at high temperature.
The yellowing of the polypropylene material is caused by the formation of a quinoid structure, and is also related to the degradation of the polypropylene resin, and the hydroperoxide can promote the degradation of the polypropylene.
In a specific embodiment, to further reduce the discoloration of the magnesium hydroxide masterbatch, the antioxidant is preferably one or more of tris [2, 4-di-t-butylphenyl ] phosphite (antioxidant 168), bis (2, 4-di-t-butylphenyl) pentaerythritol diphosphite (antioxidant 626) and dioctadecyl 3,3' -thiodipropionate (thioester antioxidant PS802 FL).
Further preferably, the antioxidant is a thioester antioxidant PS802FL (dioctadecyl 3,3' -thiodipropionate).
Preferably, the magnesium hydroxide has an average particle size of 4 μm or less.
Preferably, the magnesium hydroxide has an average particle diameter of 2 to 4 μm.
The particle size of magnesium hydroxide is related to the mechanical property of the polypropylene material prepared by master batch application, and is too large, so that surface defect points can be formed, the impact property of the material is affected, and too small particle size can cause difficult dispersion of the material and agglomeration.
The invention also specifically protects a preparation method of the magnesium hydroxide master batch, which comprises the following steps:
s1, preheating magnesium hydroxide to 80 ℃, adding a surfactant, uniformly mixing, and carrying out modification treatment at 100-120 ℃;
s2, mixing the modified product in the S1 with other components, adding the mixture into an internal mixer, controlling the temperature of the internal mixer to 170-180 ℃, carrying out internal mixing for 10-15 min, and carrying out hot cutting granulation by a single screw extruder to obtain the magnesium hydroxide master batch.
Wherein the temperature of the modification treatment in S1 needs to take into account the modification temperature required for sufficient melting action of the surfactant and not pyrolysis.
The application of the magnesium hydroxide master batch in preparing the modified plastic product is also within the protection scope of the invention.
The magnesium hydroxide master batch has good resin compatibility, the flame retardant property of magnesium hydroxide is ensured, the mechanical property of the material is not lost, and the color change problem in the application process is also greatly avoided, so that the magnesium hydroxide master batch can be widely applied to the preparation of modified plastic products.
As one of the application methods, the following can be specifically mentioned:
(1) Uniformly mixing polypropylene resin, a toughening elastomer and master batch in a high-speed mixer;
(2) The mixed mixture is melted and blended by a double-screw extruder, and the feeding rotating speed of the double-screw extruder is preferably 250-350 rpm; the temperature of each section of screw rod of the double screw extruder from the feed inlet to the machine head is preferably 150-160 ℃ in the first region, 180-190 ℃ in the second region, 180-190 ℃ in the third region, 180-190 ℃ in the fourth region, 180-190 ℃ in the fifth region, 200-210 ℃ in the mouth mold, and the rotating speed of the host machine is 300-500 rpm, and the vacuum degree is lower than 0.1MPa;
(3) The components are uniformly mixed by shearing and mixing by a screw, and then the mixture is granulated and dried to obtain the modified plastic product.
Compared with the prior art, the invention has the beneficial effects that:
(1) The magnesium hydroxide master batch is prepared by carrying out surface coating modification treatment on magnesium hydroxide by a surfactant containing amino, alkyl and hydroxyl, so that the compatibility of magnesium hydroxide and polypropylene resin is increased, and the dispersion is better, thereby effectively improving the mechanical property of the magnesium hydroxide master batch applied to plastic products, and the impact property can reach 14.3kJ/m 2 And the elongation at break can reach more than 63%.
(2) The magnesium hydroxide master batch does not contain quinone antioxidants, and the color change problem of the magnesium hydroxide master batch is greatly improved by adding specific antioxidants to have synergistic effect with other components, so that the magnesium hydroxide master batch has no obvious yellowing.
Detailed Description
The invention will be further described with reference to the following specific embodiments, but the examples are not intended to limit the invention in any way. Raw materials reagents used in the examples of the present invention are conventionally purchased raw materials reagents unless otherwise specified.
Among them, the raw materials of the examples and comparative examples of the present invention are described below:
(1) Sources of raw materials
Polypropylene: the polypropylene PP RP346R is prepared by the manufacturer: liandbarsel;
polypropylene copolymer PP EP300M, manufacturer: middle sea shell;
toughening agent: ethylene-octene copolymer: POE DF610, manufacturer: japanese triple well chemistry;
magnesium hydroxide:
magnesium hydroxide a: JLH-M3D12A: the average particle size of the magnesium hydroxide is 4 mu m, and the manufacturer: shenzhen Jinhaohui mining Co., ltd;
magnesium hydroxide B: H1210-5C: the average particle size of the magnesium hydroxide is 8 mu m, and the manufacturer: fangfang sea Li Longmei Co., ltd;
magnesium hydroxide C: MDS51A the magnesium hydroxide has a nominal average particle size of 1 μm, manufacturer: liaoning magnesium shield New Material Co., ltd; synergistic flame retardant:
melamine cyanurate, commercially available, was the same as in the other examples and comparative examples;
surface active agent:
surfactant a: n.n-bis hydroxyethyl alkyl amide: a4-88, zhejiang Jiahua refined Co., ltd;
surfactant B: ethoxylated amide wax, KF-301, shaoxing Jiahua Polymer materials Co., ltd;
surfactant C: ethoxylated amide wax of stearic acid, LB-101N, horniweil (China);
surfactant D: modified bisstearamide, TAS-3A, limited photochemical aids in Xingtailand Suzhou;
stearic acid: 1801,PT.SUMI ASIH (Indonesia);
an antioxidant:
antioxidant-1: dioctadecyl 3,3' -thiodipropionate: PS802FL, basf, germany
Antioxidant-2: pentaerythritol bis (2, 4-t-butylphenyl) phosphite: ultranox 627A (U627A) manufactured by Bogge-Waner Inc., U.S.;
antioxidant-3: triethylene glycol bis- β - (3-tert-butyl-4-hydroxy-5-methylphenyl), irganox 168 manufactured by BASF, germany;
hindered phenolic antioxidants 1010, commercially available.
And (3) a lubricant: ethylene bis stearamide, commercially available, was the same as in the other examples and comparative examples.
Examples 1 to 8
The magnesium hydroxide master batch comprises the following components in parts by weight as shown in table 1:
TABLE 1
The preparation method of the magnesium hydroxide master batch of the above examples 1 to 8 comprises the following steps:
s1, drying magnesium hydroxide at 110 ℃ for 7 hours, adding the magnesium hydroxide into a high-speed mixer, preheating to 80 ℃ and adding a surfactant under low-speed stirring, uniformly mixing, and carrying out modification treatment at 120 ℃;
s2, mixing the modified product in the S1 with other components, adding the mixture into an internal mixer, controlling the temperature of the internal mixer to 180 ℃, carrying out internal mixing for 15min, and carrying out hot cutting granulation by a single screw extruder to obtain the magnesium hydroxide master batch.
Example 9
The magnesium hydroxide master batch is basically the same as in example 5 in the components and the content, and is characterized in that the magnesium hydroxide is magnesium hydroxide B, H1210-5C: the magnesium hydroxide had an average particle diameter of 8. Mu.m.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Example 10
The magnesium hydroxide master batch is basically the same as in example 5 in components and content, and is characterized in that the surfactant is surfactant B: ethoxylated amide wax.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Example 11
The magnesium hydroxide master batch is basically the same as in example 5 in terms of components and content, except that the surfactant is surfactant C: stearic acid ethoxylated amide wax.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Example 12
The magnesium hydroxide master batch is basically the same as in example 5 in components and content, and is characterized in that the surfactant is surfactant D: modified bis-stearamide.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Example 13
The magnesium hydroxide master batch is basically the same as example 5 in components and content, and is characterized in that the antioxidant is antioxidant-2: pentaerythritol bis (2, 4-t-butylphenyl) phosphite, U627A.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Example 14
The magnesium hydroxide master batch is basically the same as in example 5 in composition and content, except that the antioxidant is antioxidant-3 triethylene glycol bis-beta- (3-tert-butyl-4-hydroxy-5 methylphenyl) or Irganox 168.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Example 15
The magnesium hydroxide master batch is basically the same as in example 5 in components and content, and is characterized in that magnesium hydroxide is magnesium hydroxide C, MDS-51A: the magnesium hydroxide had an average particle diameter of 1. Mu.m.
The magnesium hydroxide master batch was prepared in the same manner as in example 5.
Comparative examples 1 to 5
The magnesium hydroxide master batch comprises the following components in parts by weight:
| sequence number | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Polypropylene | 20 | 20 | 20 | 15 | 45 |
| Magnesium hydroxide A | 60 | 60 | 60 | 50 | 70 |
| Synergistic flame retardant | 10 | 10 | 10 | 15 | 5 |
| Surfactant A | 3 | 7 | 0.5 | ||
| Stearic acid 1801 | 3 | ||||
| Antioxidant-1 | 0.3 | 0.3 | 0.1 | 0.5 | |
| Antioxidant 1010 | 0.3 | ||||
| Lubricant | 0.2 | 0.2 | 0.2 | 0.5 | 0.1 |
The preparation method of the magnesium hydroxide master batch of the comparative examples 1 to 5 comprises the following steps:
s1, drying magnesium hydroxide at 110 ℃ for 7 hours, adding the magnesium hydroxide into a high-speed mixer, preheating to 80 ℃ and adding a surfactant under low-speed stirring, uniformly mixing, and carrying out modification treatment at 120 ℃;
s2, mixing the modified product in the S1 with other components, adding the mixture into an internal mixer, controlling the temperature of the internal mixer to 180 ℃, carrying out internal mixing for 15min, and carrying out hot cutting granulation by a single screw extruder to obtain the magnesium hydroxide master batch.
Result detection
The magnesium hydroxide master batch and the magnesium hydroxide master batch modified polypropylene product are subjected to relevant performance detection, wherein the detection performance of the magnesium hydroxide master batch comprises the following steps: yellowing grade detection and surface smoothness detection.
The performance detection of the magnesium hydroxide masterbatch modified polypropylene product comprises the following steps: impact performance detection, elongation at break detection, yellowing grade detection, dispersion grade detection, and surface smoothness detection.
The specific preparation method of the magnesium hydroxide master batch modified polypropylene product comprises the following steps:
the preparation method of the modified plastic comprises the following steps:
(1) The components are proportioned according to the following proportion by weight:
55 parts of polypropylene PP EP300M;5 parts of toughener POE DF610;40 parts of magnesium hydroxide master batch; then mixing for 2 minutes in a high-speed mixer;
(2) Carrying out melt blending on the mixed mixture by adopting a double-screw extruder, wherein the feeding speed of the double-screw extruder is 300rpm; the temperature of each section of screw rod of the double screw extruder from the feed inlet to the machine head is preferably 150 ℃ in the first region, 160 ℃ in the second region, 180 ℃ in the third region, 190 ℃ in the fourth region, 190 ℃ in the fifth region, 200 ℃ in the mouth die temperature, 400rpm in the main machine, and the vacuum degree is lower than 0.1MPa, and the components are uniformly mixed through screw rod shearing and mixing, and then are granulated and dried to obtain the modified plastic.
Wherein the magnesium hydroxide master batch is the magnesium hydroxide master batch prepared in each example and comparative example.
The specific performance detection method comprises the following steps:
(1) Yellowing grade: the color of the magnesium hydroxide master batch is manually judged, the grade 5 is completely unchanged, the 4 is slightly yellow (the yellowing is not obvious), the 3 is slightly yellow (the yellowing is slightly obvious), the 2 is slightly serious (the yellowing is obvious), and the 1 is very serious (the yellowing is quite obvious).
Wherein, the yellowing grade of the master batch and the yellowing grade of the modified product are respectively rated according to respective discoloration degrees, and are relatively independent detection results.
(2) Dispersion grade: the width of the center 1cm in the width direction of the color plate (length 83 mm. Wide 53 mm. Thickness 2mm high color plate) was marked. The color plate was folded in half 5 times at an air temperature of 23.+ -. 10 ℃ under a microscope for observation, and the number of stress whitening marks generated by the folds having a length of more than 72 μm within 1cm width of the center in the width direction of the outer side of the folded in half was counted.
The color plates which do not generate crease lines larger than 72 μm are respectively selected from the color plates with the dispersion grade of 0 grade, 1 grade within 10 grade and 2 grade within 20 grade, and the like, wherein the stress whitening mark number is within 60 grade, and the color plates are no longer rated for more than 60 grade;
(3) Surface smoothness: manually evaluating the surface smoothness of an internal mixing product of the internal mixer, wherein O represents the smoothness of the surface of a single screw extrusion spline and has no granular feel; delta represents that the surface smoothness of the spline is general and slightly granular; x represents the surface roughness of the sample strip, and the larger granular sensation;
(4) Impact properties: the test was performed according to ISO 180-2000 standard, the sample size being 4mm by 10mm by 80mm, type A notch. The test equipment is an impact tester HIT2.7P of Zwick Roell company, germany;
(5) Elongation at break: the test was performed according to ISO 527-2-2012, the spline size being 1A and the specimen gauge being 50mm. The test equipment is a new three-thought electronic universal tester (20 KN).
(1) Magnesium hydroxide master batch performance detection
Wherein, the detection results of the relevant properties of the magnesium hydroxide master batch product are shown in the following table 3.
TABLE 3 Table 3
The results are shown in Table 3: the examples show that after the N.N-dihydroxyethyl alkylamide A4-88 surface active auxiliary agent is added, the interaction between amino and hydroxyl can effectively coat magnesium hydroxide, so that the compatibility of magnesium hydroxide and polypropylene resin is increased, the surface smoothness of the banburying master batch is improved, and meanwhile, the color change degree of the magnesium hydroxide master batch is greatly reduced because the antioxidant 1010 which causes color change is not contained.
The magnesium hydroxide B of example 9 has a large surface particle diameter and thus has slightly poor surface smoothness.
Examples 10-12 demonstrate that the addition of other amide-based activating aids has a poor yellowing grade due to differences in molecular structure and hydrogen bonding forces.
The results in table 3 show that: in comparative example 1, since magnesium hydroxide has a large number of hydroxyl groups on the surface, affinity with lipophilic polymer molecules is poor, secondary agglomeration tends to occur, and no improvement of surfactant results in poor dispersibility and compatibility of magnesium hydroxide, severe yellowing and poor surface smoothness.
In comparative example 2, magnesium hydroxide is extremely basic, and thus, it is liable to react with the antioxidant 1010 to form a developed group of quinoid structure, resulting in serious yellowing of the material.
The surface of comparative example 3 was not improved by using other surfactants containing no amino group, alkyl group and hydroxyl group.
Comparative examples 4-5 show that the amount of surfactant is also critical, and that too much or too little results in a deterioration of the relevant properties.
(2) Magnesium hydroxide master batch modified polypropylene product performance detection
The results of the performance test of the magnesium hydroxide masterbatch modified polypropylene products of the above examples and comparative examples are shown in Table 4 below.
TABLE 4 Table 4
The example data shows that: the N.N-dihydroxyethyl alkylamide A4-88 surface active auxiliary agent is added, so that the resin compatibility of magnesium hydroxide and polypropylene is increased, and the obtained magnesium hydroxide master batch has good impact property and elongation at break when being applied to modified polypropylene products, and simultaneously improves the yellowing and dispersibility of the material, and the surface is smoother.
Because the magnesium hydroxide master batches of comparative examples 1-5 are poorly dispersed, the impact strength and elongation at break of the material are lower, and yellowing is slightly severe.
In comparative example 4, too much amount of the surfactant affects not only the conventional impact properties but also the elongation at break of the material is greatly reduced compared with example 5.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. The magnesium hydroxide master batch is characterized by comprising the following components in parts by weight:
15-45 parts of polypropylene; 50-70 parts of magnesium hydroxide; 5 to 15 parts of synergistic flame retardant, 1 to 6 parts of surfactant, 0.1 to 0.5 part of antioxidant, 0.1 to 0.5 part of lubricant,
the surfactant is one or more of N, N-dihydroxyethyl alkylamide, ethoxyamide wax, stearic acid ethoxyamide wax and modified bisstearamide TAS-3A,
the dosage of the surfactant is 3-5% of the mass content of the magnesium hydroxide,
the antioxidant is one or more of triethylene glycol bis-beta- (3-tert-butyl-4-hydroxy-5-methylphenyl), pentaerythritol bis-phosphorous acid (2, 4-tert-butylphenyl) and 3,3' -thiodipropionic acid dioctadecyl ester.
2. The magnesium hydroxide masterbatch according to claim 1 wherein said surfactant is an n, n-bis hydroxyethyl alkyl amide.
3. The magnesium hydroxide masterbatch according to claim 1 wherein said antioxidant is dioctadecyl 3,3' -thiodipropionate.
4. The magnesium hydroxide master batch according to claim 1, wherein the magnesium hydroxide has an average particle size of 4 μm or less.
5. The magnesium hydroxide master batch according to claim 4, wherein the magnesium hydroxide has an average particle diameter of 2 to 4 μm.
6. A method for preparing the magnesium hydroxide master batch according to any one of claims 1 to 5, comprising the steps of:
s1, preheating magnesium hydroxide to 80 ℃, adding a surfactant, uniformly mixing, and carrying out modification treatment at 100-120 ℃;
s2, mixing the modified product in the step S1 with other components, adding the mixture into an internal mixer, controlling the temperature of the internal mixer to 170-180 ℃, carrying out internal mixing for 10-15 min, and carrying out hot cutting granulation by a single screw extruder to obtain the magnesium hydroxide master batch.
7. Use of the magnesium hydroxide master batch according to any one of claims 1 to 5 for preparing modified plastic products.
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