CN110092926A - The preparation method and applications of alkali magnesium sulfate crystal whisker master batch - Google Patents
The preparation method and applications of alkali magnesium sulfate crystal whisker master batch Download PDFInfo
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Abstract
The present invention relates to a kind of preparation methods of alkali magnesium sulfate crystal whisker master batch, including (1): magnesium oxide powder is configured to magnesia initial reaction solution with deionized water, it is stirred with reaction equation blender, the sulfuric acid and mine fiber, strong mixing that then addition concentration is obtain suspension；(2): suspension being poured into reaction kettle, hydrothermal synthesis reaction is carried out, is cooled to room temperature, reactant is taken out, is rinsed with deionized water, dry filter cake after filtering, grind to obtain alkali magnesium sulfate crystal whisker；(3): by polypropylene powder, alkali magnesium sulfate crystal whisker, maleic anhydride, peroxide, dispersing agent, dispersing agent, processing aid mixing, squeezes out, after its particle is cleaned with excessive methanol, it is cleaned again with deionized water, up to alkali magnesium sulfate crystal whisker master batch after drying, alkali magnesium sulfate crystal whisker master batch obtained can be applied in terms of automobile loss of weight.
Description
Technical field
The invention belongs to fibrous material technical fields, and in particular to a kind of preparation method of alkali magnesium sulfate crystal whisker master batch and
It is applied.
Background technique
Automobile Part loss of weight is main be moulding is thinning, design scheme can encounter following difficulty:
(1) buckling deformation, buckling deformation are product internal stresses releases as a result, the shrinking percentage with product is related；And it is thin
Wall injection molding be quick mold filling process, cooling time is short, the crystallization rate of the material of different location be extremely difficult to crystallinity it is consistent,
Therefore the component after being molded easily generates buckling deformation phenomenon；
(2) product rigidity is poor, since product is relatively thin, even if it has the design of reinforcing rib, it is also difficult to obtain higher mould
Amount；In addition, thin wall product surface is easy to appear the defects of current mark and tiger fur line.
The alias of alkali magnesium sulfate crystal whisker: magnesium salt whisker, magnesium oxysulfide whisker, magnesium sulfate fiber are a kind of novel inorganic resistances
Combustion, reinforcing fiber materials are in mono-crystalline structures.Compared with composite plastic, there is apparent enhancing, increase rigid, fire retardation.It can make to make
Part has high deformation temperature, and the bright and clean beauty of article surface reduces the specific gravity of product, and asepsis environment-protecting.Alkali magnesium sulfate crystal whisker,
Have the characteristics that in excellent product in, product to be in mono-crystalline structures as a kind of new material；It is compounded with apparent increasing with plastics
By force, increase rigid, fire-retardant effect；Make product that there is the surface of bright and clean beauty, high heat distortion temperature simultaneously；Reduce product specific gravity and
It is environment-protecting and non-poisonous.Because having small special mono-crystlling fibre structure, ultra-thin product, the reinforcement of micro part, increasing have been particularly suitable for it just；It should
Product can assign the good scratch resistance of product and anti-skidding, meet automobile and other engineering plastics exempt from the needs of spraying, meanwhile, alkali
Formula magnesium sulfate crystal whisker is suitble to automobile PP product, ABS product, PA-6 product, can substantially reduced product specific gravity and meet use
It is required that achieve the purpose that make automotive light weight technology.
Summary of the invention
To solve problems of the prior art, the present invention provides a kind of preparation side of alkali magnesium sulfate crystal whisker master batch
Method, according to sequencing the following steps are included:
Step (1): magnesium oxide powder is configured to magnesia initial reaction solution with deionized water, with reaction equation blender
Stirring, makes magnesium oxide powder be uniformly dispersed, and sulfuric acid and mine fiber, strong mixing that concentration is 75% is then added, and keeps its dispersion equal
It is even, obtain suspension；
Step (2): suspension made above is poured into reaction kettle, carries out hydrothermal synthesis reaction, stopping after having reacted
Stirring and heating, are cooled to room temperature, and take out reactant, are rinsed with deionized water, dry filter cake after filtering, spent again after milling
Ionized water rinses drying, this process is repeated 3 times, alkali magnesium sulfate crystal whisker is obtained；
Step (3): weighing 60 parts of polypropylene powder, and 40 parts of alkali magnesium sulfate crystal whisker, 1-2 parts of maleic anhydride, peroxide
0.2-0.3 parts, 0.2-0.3 parts of dispersing agent, 0.2-0.3 parts of dispersing agent, 1.0-3.0 parts of processing aid；By the above components height
Fast blender mixing after cleaning its particle with excessive methanol, then uses deionization with double screw extruder extrusion is waved after mixing
Water cleaning, up to alkali magnesium sulfate crystal whisker master batch after drying.
Preferably, in step (1), the concentration of the magnesia initial reaction solution is 3.5%~4.0%.
In any of the above-described scheme preferably, the concentration of magnesia initial reaction solution is got according to calculating and experiment:
J/G=KJ/KGS (μ J- μ G), J is nucleation rate；G is rate of nucleus growing；S is degree of supersaturation；KJ, KG are nucleation and growth
Kinetic constant；μ J, μ G are nucleation and growth dynamics series.
In any of the above-described scheme preferably, in step (1), the sulfuric acid of addition and the molar ratio of magnesia are 1:4.5
~1:5；The mine fiber diameter of addition is 10000~15000 mesh, and two of addition account for overall weight 40%~60%.
In any of the above-described scheme preferably, in step (2), the detailed step of hydrothermal synthesis reaction are as follows: control is 0.5
The heating rate of~0.8 DEG C/min is warming up to 165 DEG C, constant temperature 4 hours.
In any of the above-described scheme preferably, in step (3), the molecular weight of the polypropylene powder of selection is in 29000-
Between 31000.
In any of the above-described scheme preferably, in step (3), peroxide selects cumyl peroxide or peroxidating
Dibenzoyl class product.
In any of the above-described scheme preferably, in step (3), dispersing agent selects zinc stearate or calcium stearate；Processing
Auxiliary agent is ethylene bis stearamide, maleic anhydride grafted polyethylene wax and silicone oil.
In any of the above-described scheme preferably, the kind alkali magnesium sulfate crystal whisker master batch of above method production, can be used in
Produce automobile-used PP product, ABS product and PA-6 product.
1. due to the density ratio of whisker MOS, other mineral fillers are much lower, with poly- the third of whisker MOS enhancing
Much lighter than general material at present of alkene material；
2. being added in polypropylene/elastomer system with whisker MOS merely, with the raising of Whisker Content, the drawing of system
It stretches intensity and bending strength also increases accordingly, the trend of first increases and then decreases is all presented in the mobility and impact strength of system,
In this co-mixing system, the crystallinity of material improves, fusing point, crystallization initiation temperature and the crystallization of material with the raising of Whisker Content
Temperature all shows the trend gradually increased；
3. be added in polypropylene/elastomer/Talc with whisker MOS, with the raising of Whisker Content, system
Tensile strength and bending strength also increase accordingly, the mobility and impact strength of system, and becoming for first increases and then decreases is also all presented
Gesture, in this co-mixing system, the crystallinity and fusing point of material are improved with the raising of Whisker Content, but the crystallization initiation of material
Temperature and crystallization temperature show the trend gradually decreased all because the addition of whisker destroys the crystalline state of system.
Detailed description of the invention
Fig. 1 is alkali magnesium sulfate crystal whisker enlarged drawing；
Fig. 2, Fig. 3 are influence linear graph of the addition to pure resin system performance of MOS master batch；
Fig. 4, Fig. 5 are influence linear graph of the additive amount of MOS master batch to system crystal property；
Fig. 6, Fig. 7, Fig. 8, Fig. 9 are the addition of MOS master batch to polypropylene/elastomer/Talc performance influence line
Shape figure；
Figure 10 is that alkali magnesium sulfate crystal whisker master batch impacts batten section SEM photograph.
Specific embodiment
In order to be further understood that summary of the invention of the invention, the present invention is elaborated below in conjunction with specific embodiment.
The preparation of one, alkali magnesium sulfate crystal whisker:
1. first magnesium oxide powder is configured to centainly with deionized water for raw material with chemical pure zirconia magnesium (purity > 98%)
The initial reaction solution (the concentration control of solution is 2.0%~6.0% in mass ratio) of concentration, with reaction equation blender stirring 24
After hour, magnesium oxide powder is made to be uniformly dispersed, concentration is added then as 75% sulfuric acid, the molar ratio of sulfuric acid and magnesia is 1:
4.5~1:5, is added the mine fiber for accounting for 10000~15000 mesh of overall weight 40%~60%, and strong mixing keeps its dispersion equal
It is even；
2. suspension made above is poured into reaction kettle, hydrothermal synthesis reaction is carried out, reaction kettle heating rate to the greatest extent may be used
Can be slow, it controls in 0.5~0.8 DEG C/min, when being warming up to 165 DEG C, after constant temperature 4 hours, stops stirring and heating, be cooled to
Room temperature is taken out reactant, is rinsed with deionized water, dries filter cake with 120 DEG C after filtering, is rinsed again with deionized water after milling
Drying, this process is repeated 3 times, last gains be alkali magnesium sulfate crystal whisker (diameter be 0.5~1.0 μm, length be 20~
80μm)；
Emphasis step during being somebody's turn to do:
1. the concentration of magnesia initial reaction solution is got according to calculating and experiment:
J/G=KJ/KGS(μJ-μG)
J is nucleation rate；
G is rate of nucleus growing；
S is degree of supersaturation；
KJ, KG are nucleation and growth kinetic constant；
μ J, μ G are nucleation and growth dynamics series.
The ratio between nucleation rate J, rate of nucleus growing G depend mainly on degree of supersaturation, in a certain range (μ J > μ G), satiety
Lower with spending, nucleus growth rate is relatively bigger, is more conducive to nucleus growth；And nucleation rate is relatively smaller, is more unfavorable for core
Generation, there is in result product part not yet to generate whisker.Under the conditions of low concentration and preferable mass-and heat-transfer, due to magnesia
Initial reaction concentration is lower, and Mg2+ content is lower in solution, and whisker grows very fast along screw dislocation.Mg2+Concentration is bigger, nucleation
Rate is bigger, and growth rate is smaller.
But since the initial reaction concentration of magnesia is higher, magnesium oxide particle quantity is more, and nucleation rate is fast, nucleus growth
Rate is slow；In addition mass-and heat-transfer condition is poor during hydrothermal synthesis reaction, and the growth of nucleus screw dislocation is adversely affected, and leads
Whisker length is caused to be shortened, draw ratio becomes smaller, and with the presence of a small amount of particle.
Therefore by experiment, by the control of the concentration of magnesia initial reaction solution mass fraction 3.5%~4.0% it
Between.
2. the draw ratio of the magnesium sulfate crystal whisker of the stirring intensity and generation of reaction has much relations:
According to experiment as can be seen that concentration it is low when can use lower stirring intensity, synthesize compared with big L/D ratio alkali formula sulphur
Sour magnesium whisker；When concentration improves, stirring intensity also should be moderately higher, and stirring intensity should be controlled 300 × 10-6~500 × 10-6,
The stirring intensity that this law uses is 480 × 10-6, the alkali magnesium sulfate crystal whisker of preparation amplifies 800 times of image with optical microscopy
As shown in Figure 1.
Two, prepare alkali magnesium sulfate crystal whisker master batch:
Formula is following (following ingredients be by weight percentage to indicate)
Wherein:
(1) polypropylene (PP) powder, needs the product of low molecular weight (molecular weight is 30000 or so), and otherwise grafting is difficult；
(2) peroxide selects cumyl peroxide or dibenzoyl peroxide class product；
(3) dispersing agent selects zinc stearate or calcium stearate；
(4) processing aid is ethylene bis stearamide, maleic anhydride grafted polyethylene wax and silicone oil；
The above components are mixed with high-speed mixer, the devolatilization double screw extruder for being 50:1 with draw ratio, at 200 DEG C
~230 DEG C of extrusions, after its particle is cleaned 3 times or more with excessive methanol, then are cleaned 2 times with deionized water, so as to will wherein
Maleic anhydride clean, and by its wash products, after 105 DEG C are dry, can be prepared by alkali magnesium sulfate crystal whisker grafting master batch.
Influence of the addition of one .MOS master batch to pure resin system performance (formula is shown in Table 1)
Table 1
Influence of the additive amount of MOS master batch to system liquidity:
Figure it is seen that when Whisker Content is less in blend system (< 5%), the mobility of system is slightly mentioned
It is high.And when Whisker Content is less in system (> 5%), the mobility of system sharply declines.This is mainly due to whisker rulers itself
It is very little very tiny, and there is biggish draw ratio, after coupling agent treatment, whisker can be coated well by matrix resin,
Good boundary layer is formed with matrix resin, orientation is formed when less whisker flows in melt polypropylene, in melt flows side
To ordered arrangement is generated, resistance when melt flows is reduced, certain lubricating action is played, when whisker additive amount further increases
When big, since solid content is too high in melt polypropylene, the interior friction of polypropylene molecule interchain increased, is seriously hindered poly-
The movement of polypropylene segments, melt flows resistance increases, so that polypropylene mobility be made sharply to decline, melt flow rate (MFR) is reduced.
Influence of the additive amount of MOS master batch to system impact property:
Figure it is seen that the notch impact strength of system is slightly when Whisker Content is less in blend system (< 5%)
It is improved.And when Whisker Content is less in system (> 5%), the notch impact strength of system sharply declines.This is because, brilliant
Palpus MOS is polar material, and polypropylene is non-polar material, and the compatibility of the two is bad.When polypropylene is impacted, whisker with
Matrix resin is detached from.And the filling of whisker makes polypropylene segment retard motion, under the action of impact energy, segment is difficult
It with stretching, extension, is broken, the toughness decline of material.And when Whisker Content is less, fibrous whisker can rise in the base
, can be by matrix resin in stress transfer to whisker to effective transmitting of stress, Anticrack, to improve system
Notch impact strength.
Influence of the additive amount of MOS master batch to system tensile strength:
From figure 3, it can be seen that the tensile strength of system greatly improves when Whisker Content increases in blend system.
This is because whisker tensile strength is far longer than matrix resin, it effectively increases the shearing that matrix resin generates at interface
Yield stress, this stress increases as whisker dosage increases, therefore tensile strength is consequently increased.
Influence of the additive amount of MOS master batch to system bending strength:
From fig. 3 it can also be seen that the bending strength of system, which also has, substantially to be mentioned when Whisker Content increases in blend system
It is high.This is because whisker is evenly dispersed in matrix resin, skeleton function is played, secondly whisker can be such that polypropylene cohesive strength increases
Greatly, therefore the bending strength of mechanical strength system can be significantly improved.
Influence of the additive amount of MOS master batch to system crystal property:
| Experiment numbers | Fusing point (DEG C) | Crystallization temperature (DEG C) | Crystallization initiation temperature (DEG C) | It crystallizes heat content (J/g) |
| 1# | 166.24 | 115.46 | 119.92 | 77.94 |
| 2# | 171.22 | 118.34 | 122.89 | 68.94 |
| 3# | 173.07 | 120.49 | 124.24 | 58.36 |
| 4# | 172.20 | 123.84 | 125.21 | 55.07 |
Table 2
From Fig. 4, Fig. 5, it can be seen that, with the increase of MOS master batch dosage, the fusing point (Tm) of blend system has in table 2
Increase, and crystallize heat content and then reduced, and the crystallization initiation temperature of material and crystallization temperature are all presented and gradually increased
Trend, illustrate polypropylene in crystallization process, MOS master batch can play good heterogeneous nucleating effect, can be with from figure
Find out the increase with whisker MOS dosage, the half-peak breadth of blend system is gradually reduced, brilliant since peak crystallization half-peak breadth is smaller
Particle size narrowly distributing, obtained crystallization is more perfect, in addition, MOS master batch plays the role of heterogeneous nucleation agent in the system, compared to
The mode of virgin pp homogeneous nucleation, often all nucleus generate heterogeneous nucleation simultaneously in the process, and obtained crystal grain is opposite more
Add uniformly.
It can be seen that MOS master batch in acrylic resin by testing above, can greatly improve the rigidity of resin,
But to its mobility, toughness is not had much influence, and moulding loss of weight is made to become possibility；
The addition of two .MOS master batches is to polypropylene/elastomer/Talc performance influence (formula is shown in Table 3):
Table 3
It can be seen that the variation of the mobility, impact property, tensile strength, bending strength of co-mixing system from Fig. 6, Fig. 7
Similar to polypropylene/elastomer/MOS master batch system, rigidity can all be improved but the mobility to system and tough
Property has no too much influence.
The addition of whisker is to the influence of polypropylene/elastomer/Talc crystal property:
| Experiment numbers | Fusing point (DEG C) | Crystallization temperature (DEG C) | Crystallization initiation temperature (DEG C) | It crystallizes heat content (J/g) |
| 5# | 167.89 | 130.00 | 134.35 | 50.36 |
| 6# | 169.23 | 123.27 | 128.91 | 47.65 |
| 7# | 169.95 | 122.39 | 127.26 | 45.72 |
| 8# | 170.66 | 121.06 | 126.06 | 44.84 |
Table 4
From Fig. 8, Fig. 9, it can be seen that, with the increase of MOS master batch dosage, the fusing point (Tm) of blend system has in table 4
Increase, and crystallize heat content and then reduced.This influence result phase of addition to pure resin system performance with MOS master batch
Together, principle is also similar, but the trend being gradually reduced all is presented in the crystallization initiation temperature of material and crystallization temperature, this illustrates to slide
Mountain flour is better than the nucleation of MOS master batch to the effect of the heterogeneous nucleation agent of system, the addition of MOS master batch destroy resin/
The crystalline state of Talc, from figure it is also seen that the half-peak breadth of 6#~9# blend system is essentially identical, therefore can recognize
For although the addition of MOS master batch can have a certain impact to the crystal habit of system, the crystallization of co-mixing system entirety is still compared
More perfect.
It can be seen that MOS master batch in acrylic resin/elastomer/Talc by testing above, it can be very big
Raising resin rigidity, but to its mobility, toughness is not had much influence, and this patent is used for the formula system of automobile loss of weight
It is all based on above theoretical and experiment；
Acrylic resin/elastomer/Talc/MOS master batch system, the car thin-wall door-plate material of production are used at present
It can as follows (volume production in Beijing Modern Automobile):
| Test item Mesh | Melting refers to Number | Density | It stretches strong Degree | Extension at break Rate | Bending is strong Degree | Bending die Amount | Impact is strong Degree | Thermal deformation temperature Degree | Ash content |
| Test side Method | GB/T 3682 | GB/T 1033 | GB/T 1040 | GB/T 1040 | GB/T 1041 | GB/T 1041 | GB/T 1843 | GB/T 1634 | GB/T 9345 |
| Unit | g/10min | g/cm3 | Kgf/cm2 | % | Kgf/cm2 | Kgf/cm2 | KJ/m2 | ℃ | Wt% |
| Representative value | 28 | 1.008 | 265 | 40 | 320 | 28600 | 22 | 131 | 20 |
Acrylic resin/elastomer/Talc/MOS master batch system, the car thin-wall instrument plate of production are used at present
Performance is following (volume production in Beijing Modern Automobile):
| Test item Mesh | Melt index | Density | Tensile strength | Extension at break Rate | Bending strength | Bending modulus | Impact strength | Thermal deformation temperature Degree | Ash content |
| Test side Method | GB/T 3682 | GB/T 1033 | GB/T 1040 | GB/T 1040 | GB/T 1041 | GB/T 1041 | GB/T 1843 | GB/T 1634 | GB/T 9345 |
| Unit | g/10min | g/cm3 | Kgf/cm2 | % | Kgf/cm2 | Kgf/cm2 | KJ/m2 | ℃ | Wt% |
| Representative value | 26 | 1.004 | 230 | 60 | 290 | 23200 | 38 | 125 | 20 |
As shown in Figure 10, which is with PP pure resin: whisker is grafted the ratio of master batch (7:3) after twin-screw extrusion, presses
ASTM D-256 standard is molded notch shock batten, the scanning electron microscope (SEM) photograph that the section after being thrust with the batten is done, wherein threadiness
Strip is the whisker dispersed in PP system.
Conclusion:
1. due to the density ratio of whisker MOS, other mineral fillers are much lower, with poly- the third of whisker MOS enhancing
Much lighter than general material at present of alkene material；
2. being added in polypropylene/elastomer system with whisker MOS merely, with the raising of Whisker Content, the drawing of system
It stretches intensity and bending strength also increases accordingly, the trend of first increases and then decreases is all presented in the mobility and impact strength of system.?
In this co-mixing system, the crystallinity of material improves, fusing point, crystallization initiation temperature and the crystallization of material with the raising of Whisker Content
Temperature all shows the trend gradually increased；
3. be added in polypropylene/elastomer/Talc with whisker MOS, with the raising of Whisker Content, system
Tensile strength and bending strength also increase accordingly, the mobility and impact strength of system, and becoming for first increases and then decreases is also all presented
Gesture.In this co-mixing system, the crystallinity and fusing point of material are improved with the raising of Whisker Content, but the crystallization initiation of material
Temperature and crystallization temperature show the trend gradually decreased all because the addition of whisker destroys the crystalline state of system.
In conclusion master batch prepared by the present invention and polypropylene compatible are splendid, whisker therein can be made uniformly to divide
It is dispersed in mixed system, and can then occur phenomenon of uniting in mixed system using whisker original powder, seriously affect the items of system
Performance；When using the master batch, production environment completely without dust, is conducive to the environmental protection in workshop；The master batch is low in cost, compared with equal proportion
Whisker original powder addition, cost reduce by 20% or so.
In addition, alkali magnesium sulfate crystal whisker grafting master batch is added to using polypropylene as in the automobile material of substrate, comparison is traditional
Modified materials have the advantage that
1. under performance identical with traditional modified materials, a small amount of addition (5%-10%) master batch energy be can significantly reduce
The density of material；It is greatly improved using the material of the master batch than the mechanical property of traditional modified materials when being molded thin-wall part, because
This master batch can be used in automotive material lightweight；
2. the addition of the master batch can significantly improve the tensile strength of material, bending strength, bending modulus, impact strength,
And its mobility is had not significant impact.
It will be apparent to those skilled in the art that the preparation method and applications packet of alkali magnesium sulfate crystal whisker master batch of the invention
Include aforementioned present invention specification summary of the invention and specific embodiment part and attached drawing shown by any group of each section
It closes, describes one by one as space is limited and for each scheme for keeping specification concise without constituting these combinations.It is all of the invention
Within spirit and principle, any modification, equivalent substitution, improvement and etc. done be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of preparation method of alkali magnesium sulfate crystal whisker master batch, according to sequencing the following steps are included:
Step (1): being configured to magnesia initial reaction solution with deionized water for magnesium oxide powder, and stirring makes magnesium oxide powder
It is uniformly dispersed, sulfuric acid and mine fiber is then added, stirring makes it be uniformly dispersed, obtains suspension；
Step (2): suspension prepared by step (1) is poured into reaction kettle, carries out hydrothermal synthesis reaction, stops stirring after having reacted
Mix and stir heating, be cooled to room temperature, take out reactant, rinsed with deionized water, dry filter cake after filtering, spent again after milling from
Sub- water rinses drying, obtains alkali magnesium sulfate crystal whisker；
Step (3): weighing 60 parts of polypropylene powder, and 40 parts of alkali magnesium sulfate crystal whisker, 1-2 parts of maleic anhydride, peroxide 0.2-0.3
Part, 0.2-0.3 parts of dispersing agent, 0.2-0.3 parts of dispersing agent, 1.0-3.0 parts of processing aid；The above components are mixed, mixing
It is squeezed out with waving double screw extruder, after its particle is cleaned with excessive methanol, then is cleaned with deionized water, after drying afterwards to obtain the final product
Alkali magnesium sulfate crystal whisker master batch.
2. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, which is characterized in that in step (1), institute
The concentration for stating magnesia initial reaction solution is 3.5%~4.0%.
3. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 2, which is characterized in that magnesia is initially anti-
The concentration of solution is answered to be got according to calculating and experiment: J/G=KJ/KGS(μJ-μG), J is nucleation rate；G is rate of nucleus growing；S
For degree of supersaturation；KJ, KG are nucleation and growth kinetic constant；μ J, μ G are nucleation and growth dynamics series.
4. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, which is characterized in that in step (1), add
The molar ratio of the sulfuric acid and magnesia that enter is 1:4.5~1:5；The mine fiber diameter of addition is 10000~15000 mesh, addition
Two account for overall weight 40%~60%.
5. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, which is characterized in that in step (2), water
The detailed step of thermal synthesis reaction are as follows: the heating rate controlled in 0.5~0.8 DEG C/min is warming up to 165 DEG C, constant temperature 4 hours.
6. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, which is characterized in that in step (3), choosing
The molecular weight of polypropylene powder is between 29000-31000.
7. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, which is characterized in that in step (3), mistake
Oxide selects cumyl peroxide or dibenzoyl peroxide class product.
8. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, which is characterized in that in step (3), point
Powder selects zinc stearate or calcium stearate；Processing aid is ethylene bis stearamide, maleic anhydride grafted polyethylene wax and silicon
Oil.
9. the preparation method of alkali magnesium sulfate crystal whisker master batch according to claim 1, the kind alkali formula sulphur of above method production
Sour magnesium whisker master batch can be used in producing automobile-used PP product, ABS product and PA-6 product.
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Application publication date: 20190806 |