CN107987370A - A kind of high intensity rotational moulding polyethylene mixture and preparation method thereof - Google Patents
A kind of high intensity rotational moulding polyethylene mixture and preparation method thereof Download PDFInfo
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- 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
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- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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Abstract
A kind of high intensity rotational moulding polyethylene mixture and preparation method thereof provided by the invention, its raw material are made of linear low density polyethylene (LLDPE), high density polyethylene (HDPE) (HDPE), double-heptene ethylene copolymer, crosslinked polyethylene (XLPE), plasticizer, coupling agent and stabilizer.So as to not only meet the melt flow rate (MFR) and density of rotational moulding requirement resin, while ensure the intensity of crosslinked polyethylene.
Description
Technical field
The present invention relates to plastic box technical field, is a kind of high intensity rotational moulding for being suitable for preparing urea box specifically
With polyethylene mixture and preparation method thereof.
Background technology
Rotation molding also known as revolves modeling, rotational forming, rotational molding, rotational casting, rotation-formed etc..Roll moulding shaping technology is
First plastic raw materials are added in mould, then mould constantly rotates along two vertical axises and is allowed to heat, and makes the plastic raw materials in mould
Under the action of gravity and thermal energy, gradually equably coating, melting are adhered in the whole surface of die cavity, are shaped to required
Shape, then through cooling and shaping, the demoulding, finally obtain product.The major part that rotation molding uses at present is polyethylene powders.
Due to there is no pressure effect during rotation molding, gravity is relied primarily on after material melts and in mould inside
Shaping, therefore the rheological property of material is particularly significant, especially for the product that some shapes are more complicated, common rotational moulding material is very
Difficulty is met the requirements.
The intensity of common rotation molding polyethylene material, toughness and the barrier property to containing easy seepage flow liquid under normal conditions
It is poor, therefore some more demanding product (such as fuel tank, urea box, water heater liner) common polythene materials are difficult full
Foot.
The content of the invention
It is a primary object of the present invention to provide a kind of high intensity rotational moulding polyethylene mixture and preparation method thereof, for
Existing cross-linking polyethylene materials can not meet the problem of rotational molding technique, not only meet the melt flow rate (MFR) of rotational moulding requirement resin
And density, while ensure the intensity of crosslinked polyethylene.
To achieve the above objectives, the technical solution adopted by the present invention is a kind of high intensity rotational moulding polyethylene mixture, its
Raw material is by linear low density polyethylene (LLDPE), high density polyethylene (HDPE) (HDPE), double-heptene-ethylene copolymer, the poly- second of crosslinking
Alkene (XLPE), plasticizer, coupling agent and stabilizer composition.
Preferably, the high intensity rotational moulding is calculated as by weight with the material composition composition of polyethylene mixture：50-60 parts
Linear low density polyethylene, 6-8 part high density polyethylene (HDPE), 4-6 parts of double-heptene-ethylene copolymers, the 20-25 parts of poly- second of crosslinking
Alkene, 2-3 part plasticizer, 1-2 parts of coupling agents and 2-3 parts of stabilizers.
Preferably, the linear low density polyethylene (LLDPE), its density are 0.918-0.930g/cm3, melt flows
Speed 15-21g/10min.
Preferably, the high density polyethylene (HDPE) (HDPE), its density are 0.94-0.96g/cm3, melt flow rate (MFR) 1.5-
2.5g/10min。
Preferably, the material composition of the crosslinked polyethylene is calculated as by weight：50 parts of high density polyethylene (HDPE) (HDPE),
50 parts of low density polyethylene (LDPE) (LLDPE), 2 parts of grafting agent, 0.5 part of initiator, 0.2 part of catalyst and 0.2 part
Antioxidant.
Preferably, the grafting agent is dimethylvinylmethoxysiiane.
Preferably, the initiator is cumyl peroxide (DCP).
Preferably, the catalyst is dibutyl tin laurate.
Preferably, the antioxidant is 1010.
Preferably, the plasticizer is adipic acid dibutyl ester.
Preferably, the coupling agent is both arms silane coupling agent.
Preferably, the stabilizer is triphenyl phosphite.
Preferably, the density of the crosslinked polyethylene (XLPE) is 0.928-0.936g/cm3, melt flow rate (MFR) 1.5-
2.5g/10min。
Preferably, the density of the low density polyethylene (LDPE) (LDPE) is 0.918-0.926g/cm3, melt flow rate (MFR)
2.3-6.5g/10min。
A kind of preparation method of high intensity rotational moulding polyethylene mixture, it includes step：
S100 weighs the linear low density polyethylene (LLDPE) of corresponding parts by weight, high density polyethylene (HDPE) (HDPE), bicyclic heptan
Alkene-ethylene copolymer, crosslinked polyethylene (XLPE), plasticizer, coupling agent, stabilizer a diameter of 100mm twin-screw extrusion
The melting extrusion under 180-200 in machine；
S200 sieves by Freezing smashing again, and the polyethylene mixture that particle diameter is less than 30 mesh is made.
An embodiment according to the present invention, the preparation of the crosslinked polyethylene in the step S100 include step：
S110 weighs the high density polyethylene (HDPE) (HDPE) of corrresponding quality part, low density polyethylene (LDPE) (LDPE), grafting agent, initiation
Agent, catalyst, antioxidant are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 15-50rpm, during mixing
Between be 3-5min；
The material mixed is added in Co rotating Twin Screw Extrusion comminutor and particle is made by S120, Co rotating Twin Screw Extrusion
The technological parameter of comminutor is：Temperature 160-200, engine speed 300-500rpm, feeding rotating speed 50-100rpm, melt pressure
Power 1.0-3.0MPa；
The particle made is put into drying box and carries out removal moisture drying by S130, drying box temperature setting 80-90, when dry
Between set 1-2h；
Dried particle is ground and fine powder product is made by S140 in plastic grinder, and the technological parameter of flour mill is to feed
Expect speed 150-250Kg/h, speed of grinding plate 3000-5000rpm, the of powder outlet temperature≤70, vibrating screen is 30-40 mesh sieves
Net, is made crosslinked polyethylene.
The present invention compared with the existing technology, has the following advantages and beneficial effect：
(1) linear low density polyethylene (LLDPE), high density polyethylene (HDPE) (HDPE), double-heptene-ethylene copolymer are screened
Thing, crosslinked polyethylene (XLPE) are raw material, have the advantages that intensity is high, rotational moulding is good, are meeting rotomoulded articles to polymer
On the premise of melt flow rate (MFR) requirement, the intensity of product is improved.
(2) rotational moulding has specific requirement to the melt flow rate (MFR) and density of resin：Melt flow rate (MFR)s are excessive, resin
Mobility is high, and the inner surface of product easily occurs uneven, causes product strength to reduce；Melt flow rate (MFR) is too small, resin
Poor fluidity, difficult forming；Rotational moulding is generally 2-10g/10min with the melt flow rate (MFR) of resin.When resin densities are high, material
Material rigidity is big, and shock resistance is good；When density is low, environmental stress cracking resistance is good, but shock resistance, intensity and rigidity
Difference.Rotational moulding is with resin density generally in 0.92-0.94g/cm3.Double-heptene-ethylene copolymer with it is common with polyethylene
(PE), polypropylene (PP) is different for the crystalline polyolefin of representative, is the amorphism transparent copolymer with cyclic olefin structure,
There is high rigidity, high intensity, so that with linear low density polyethylene (LLDPE), high density polyethylene (HDPE) (HDPE), bicyclic
Four kinds of heptene-ethylene copolymer, crosslinked polyethylene (XLPE) polymer are raw material, by formulation optimization, develop intensity it is high, can
The good polymer for rotomoulding resin of rotational moulding.
(3) it is plasticizer to select adipic acid dibutyl ester, and rotomoulded articles have the advantages that good toughness, resisting environmental stress and cracking,
Adipic acid dibutyl ester in the present case as linear low density polyethylene (LLDPE), high density polyethylene (HDPE) (HDPE), double-heptene-
The plasticizer of ethylene copolymer, crosslinked polyethylene (XLPE) resin alloy extrusion, has the long-chain plasticizer of 2 ester groups, has
Plasticizing efficiency is high, and heated discoloration is small, can assign the good low-temperature pliability of product and light resistance.
(4) both arms coupling agent, i.e. Dipodal Silanes silane coupling agents are selected, there are polarity and nonpolar both arms
Structure, the attachment as polyvinyl resin blending extrusion strengthen accelerating agent, improve the blending enhancing effect of polymer.
(5) dibutyl tin laurate is selected as the catalyst for preparing crosslinked polyethylene (XLPE), dimethyl ethenyl
Methoxy silane is as the grafting agent for preparing crosslinked polyethylene (XLPE), by the silane with vinyl under the action of catalyst
Organosilane crosslinked polyethylene is prepared by cross-linking reaction, it is therefore an objective to prepare the melt flow rate (MFR) for meeting rotational moulding requirement resin
And density, while ensure the intensity of crosslinked polyethylene.
Embodiment
It is described below for disclosing the present invention so that those skilled in the art can realize the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
Embodiment 1
(1) crosslinked polyethylene (XLPE) is prepared.Weigh 50 parts high density polyethylene (HDPE) (HDPE), 50 parts of low density polyethylene
Alkene (LDPE), 2 parts of dimethylvinylmethoxysiiane, 0.5 part of cumyl peroxide, the tin dilaurate of 0.2 number
Dibutyl tin, 0.2 part of antioxidant 1010 are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 15rpm,
Incorporation time is 3min；The material mixed is added in Co rotating Twin Screw Extrusion comminutor particle is made, parallel dual-screw
The technological parameter of extruding granulator is：Temperature 160, engine speed 300rpm, feeding rotating speed 60rpm, melt pressure 2.0MPa；
The particle made is put into drying box and carries out removal moisture drying, drying box temperature sets 90, drying time setting 2h；By drying
Good particle is ground in plastic grinder is made fine powder product, and the technological parameter of flour mill is rate of feeding 200Kg/h, mill
Rotating speed 5000rpm, the of powder outlet temperature≤70, vibrating screen is 30 mesh sieve nets；Obtain crosslinked polyethylene (XLPE).
(2) preparation of high intensity rotational moulding polyethylene mixture.Weigh 60 parts linear low density polyethylene (LLDPE), 6
Part high density polyethylene (HDPE) (HDPE), 5 parts of double-heptene-ethylene copolymer, 20 parts of crosslinked polyethylene (XLPE), 2 parts
Adipic acid dibutyl ester, 2 parts of Dipodal Silanes silane coupling agents, 2.5 parts of triphenyl phosphite are in a diameter of 100mm
Double screw extruder in the melting extrusion under 190, then sieve by Freezing smashing, be made particle diameter be less than the poly- second of 30 purposes
Alkene mixture.
Embodiment 2
(1) crosslinked polyethylene (XLPE) is prepared.Weigh 50 parts high density polyethylene (HDPE) (HDPE), 50 parts of low density polyethylene
Alkene (LDPE), 2 parts of dimethylvinylmethoxysiiane, 0.5 part of cumyl peroxide, 0.2 part of tin dilaurate two
Butyl tin, 0.2 part of antioxidant 1010 are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 25rpm, mix
The conjunction time is 4min；The material mixed is added in Co rotating Twin Screw Extrusion comminutor particle is made, parallel dual-screw squeezes
The technological parameter for going out comminutor is：Temperature 180, engine speed 500rpm, feeding rotating speed 50rpm, melt pressure 1.0MPa；Will
The particle made, which is put into drying box, carries out removal moisture drying, and drying box temperature sets 80, drying time setting 1h；Will be dried
Particle ground in plastic grinder fine powder product be made, the technological parameter of flour mill is rate of feeding 150Kg/h, and mill turns
Fast 4000rpm, the of powder outlet temperature≤70, vibrating screen is 40 mesh sieve nets；Obtain crosslinked polyethylene (XLPE).
(2) preparation of high intensity rotational moulding polyethylene mixture.Weigh 55 parts linear low density polyethylene (LLDPE), 7
Part high density polyethylene (HDPE) (HDPE), 4 parts of double-heptene-ethylene copolymer, 23 parts of crosslinked polyethylene (XLPE), 2.5 parts
Adipic acid dibutyl ester, 1 part of Dipodal Silanes silane coupling agents, 2 parts of triphenyl phosphite is in a diameter of 100mm
Double screw extruder in the melting extrusion under 200, then sieve by Freezing smashing, be made particle diameter be less than the poly- second of 30 purposes
Alkene mixture.
Embodiment 3
(1) crosslinked polyethylene (XLPE) is prepared.Weigh 50 parts high density polyethylene (HDPE) (HDPE), 50 parts of low density polyethylene
Alkene (LDPE), 2 parts of dimethylvinylmethoxysiiane, 0.5 part of cumyl peroxide, 0.2 part of tin dilaurate two
Butyl tin, 0.2 part of antioxidant 1010 are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 35rpm, mix
The conjunction time is 5min；The material mixed is added in Co rotating Twin Screw Extrusion comminutor particle is made, parallel dual-screw squeezes
The technological parameter for going out comminutor is：Temperature 170, engine speed 400rpm, feeding rotating speed 80rpm, melt pressure 3.0MPa；Will
The particle made, which is put into drying box, carries out removal moisture drying, and drying box temperature sets 85, drying time setting 1.5h；By drying
Good particle is ground in plastic grinder is made fine powder product, and the technological parameter of flour mill is rate of feeding 250Kg/h, mill
Rotating speed 3000rpm, the of powder outlet temperature≤70, vibrating screen is 40 mesh sieve nets；Obtain crosslinked polyethylene (XLPE).
(2) preparation of high intensity rotational moulding polyethylene mixture.Weigh 50 parts linear low density polyethylene (LLDPE), 8
Part high density polyethylene (HDPE) (HDPE), 6 parts of double-heptene-ethylene copolymer, 25 parts of crosslinked polyethylene (XLPE), 3 parts
Adipic acid dibutyl ester, 1.5 parts of Dipodal Silanes silane coupling agents, 3 parts of triphenyl phosphite are in a diameter of 100mm
Double screw extruder in the melting extrusion under 180, then sieve by Freezing smashing, be made particle diameter be less than the poly- second of 30 purposes
Alkene mixture.
Embodiment 4
(1) crosslinked polyethylene (XLPE) is prepared.Weigh 50 parts high density polyethylene (HDPE) (HDPE), 50 parts of low density polyethylene
Alkene (LDPE), 2 parts of dimethylvinylmethoxysiiane, 0.5 part of cumyl peroxide, 0.2 part of tin dilaurate two
Butyl tin, 0.2 part of antioxidant 1010 are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 45rpm, mix
The conjunction time is 4min；The material mixed is added in Co rotating Twin Screw Extrusion comminutor particle is made, parallel dual-screw squeezes
The technological parameter for going out comminutor is：Temperature 190, engine speed 300rpm, feeding rotating speed 90rpm, melt pressure 2.0MPa；Will
The particle made, which is put into drying box, carries out removal moisture drying, and drying box temperature sets 90, drying time setting 2h；Will be dried
Particle ground in plastic grinder fine powder product be made, the technological parameter of flour mill is rate of feeding 200Kg/h, and mill turns
Fast 4000rpm, the of powder outlet temperature≤70, vibrating screen is 30 mesh sieve nets；Obtain crosslinked polyethylene (XLPE).
(2) preparation of high intensity rotational moulding polyethylene mixture.Weigh 60 parts linear low density polyethylene (LLDPE), 6
Part high density polyethylene (HDPE) (HDPE), 5 parts of double-heptene-ethylene copolymer, 20 parts of crosslinked polyethylene (XLPE), 2.5 parts
Adipic acid dibutyl ester, 1.5 parts of Dipodal Silanes silane coupling agents, 2 parts of triphenyl phosphite is a diameter of
The melting extrusion under 190, then sieves by Freezing smashing in the double screw extruder of 100mm, and particle diameter is made and is less than 30 mesh
Polyethylene mixture.
Embodiment 5
(1) crosslinked polyethylene (XLPE) is prepared.Weigh 50 parts high density polyethylene (HDPE) (HDPE), 50 parts of low density polyethylene
Alkene (LDPE), 2 parts of dimethylvinylmethoxysiiane, 0.5 part of cumyl peroxide, 0.2 part of tin dilaurate two
Butyl tin, 0.2 part of antioxidant 1010 are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 50rpm, mix
The conjunction time is 3min；The material mixed is added in Co rotating Twin Screw Extrusion comminutor particle is made, parallel dual-screw squeezes
The technological parameter for going out comminutor is：Temperature 200, engine speed 400rpm, feeding rotating speed 100rpm, melt pressure 2.0MPa；
The particle made is put into drying box and carries out removal moisture drying, drying box temperature sets 80, drying time setting 1.5h；Will be dry
Dry good particle is ground in plastic grinder is made fine powder product, and the technological parameter of flour mill is rate of feeding 150Kg/h, mill
Disk rotating speed 5000rpm, the of powder outlet temperature≤70, vibrating screen is 30 mesh sieve nets；Obtain crosslinked polyethylene (XLPE).
(2) preparation of high intensity rotational moulding polyethylene mixture.Weigh 55 parts linear low density polyethylene (LLDPE), 7
Part high density polyethylene (HDPE) (HDPE), 5 parts of double-heptene-ethylene copolymer, 22 parts of crosslinked polyethylene (XLPE), 2 parts
Adipic acid dibutyl ester, 2 parts of Dipodal Silanes silane coupling agents, 2.5 parts of triphenyl phosphite are in a diameter of 100mm
Double screw extruder in the melting extrusion under 180, then sieve by Freezing smashing, be made particle diameter be less than the poly- second of 30 purposes
Alkene mixture.
Comparative example
(1) crosslinked polyethylene (XLPE) is prepared.Weigh 50 parts high density polyethylene (HDPE) (HDPE), 50 parts of low density polyethylene
Alkene (LDPE), 2 parts of dimethylvinylmethoxysiiane, 0.5 part of cumyl peroxide, 0.2 part of tin dilaurate two
Butyl tin, 0.2 part of antioxidant 1010 are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 50rpm, mix
The conjunction time is 3min；The material mixed is added in Co rotating Twin Screw Extrusion comminutor particle is made, parallel dual-screw squeezes
The technological parameter for going out comminutor is：Temperature 200, engine speed 400rpm, feeding rotating speed 100rpm, melt pressure 2.0MPa；
The particle made is put into drying box and carries out removal moisture drying, drying box temperature sets 80, drying time setting 1.5h；Will be dry
Dry good particle is ground in plastic grinder is made fine powder product, and the technological parameter of flour mill is rate of feeding 150Kg/h, mill
Disk rotating speed 5000rpm, the of powder outlet temperature≤70, vibrating screen is 30 mesh sieve nets；Obtain crosslinked polyethylene (XLPE).
(2) preparation of high intensity rotational moulding polyethylene mixture.Weigh 95 parts crosslinked polyethylene (XLPE), oneself of 2 parts
Diacid dibutyl ester, 2 parts of Dipodal Silanes silane coupling agents, 2.5 parts of triphenyl phosphite are a diameter of 100mm's
The melting extrusion under 180, then sieves by Freezing smashing in double screw extruder, and the polyethylene that particle diameter is less than 30 mesh is made
Mixture.
Add in the Plastic Rolling Molds of urea box, each 5Kg of material made from embodiment 1~5 and comparative example in oven temperature
250, heating time 20min, speed of mainshaft 6rpm, countershaft rotating speed 3rpm, cooling time 30min process conditions under rolled
Modeling, take out product be put into the warm water of 90 12 it is small when after tested, wherein Environmental Stress Cracking is according to ASTM D-1698
Method, tension test is according to ASTM D-638 methods, and notch shock is according to JIS K-7110 methods.Test result is shown in Table 1.
The sample main performance index of 1 embodiment 1~5 of table and comparative example
Embodiment 6 is to embodiment 13
With the preparation method of polyethylene mixture with embodiment 3, difference is to be crosslinked poly- for the rotational moulding of embodiment 6~13
The content of ethene is different, and the content of crosslinked polyethylene is respectively in embodiment 6~13：0 part, 10 parts, 15 parts, 20 parts, 22 parts, 27
Part, 32 parts, 40 parts, wherein, each 5Kg of material made from embodiment 6~13, adds in the Plastic Rolling Molds of urea box, in baking oven temperature
Spend 250, heating time 20min, speed of mainshaft 6rpm, countershaft rotating speed 3rpm, cooling time 30min process conditions under carry out
Rotational moulding, take out product be put into the warm water of 90 12 it is small when after tested, test result is shown in Table 2.
The sample main performance index of 2 embodiment 6~13 of table
So as to screen linear low density polyethylene (LLDPE), high density polyethylene (HDPE) (HDPE), double-heptene-ethylene copolymer
Thing, crosslinked polyethylene (XLPE) be raw material, it is necessary to optimize composition proportion, meeting rotomoulded articles to melt flow rate
On the premise of it is required that, it is also necessary to consider to improve the intensity of product.
Embodiment 14 is to embodiment 20
With the preparation method of polyethylene mixture with embodiment 3, difference is bicyclic for the rotational moulding of embodiment 14~20
The content of heptene-ethylene copolymer is different, and the content of crosslinked polyethylene is respectively in embodiment 14~20：0 part, 2 parts, 4 parts, 5
Part, 7 parts, 10 parts, 15 parts, wherein, each 5Kg of material made from embodiment 14~20, adds in the Plastic Rolling Molds of urea box, is drying
Box temperature degree 250, heating time 20min, speed of mainshaft 6rpm, countershaft rotating speed 3rpm, cooling time 30min process conditions under
Carry out rotational moulding, take out product be put into the warm water of 90 12 it is small when after tested, test result is shown in Table 3.
The sample main performance index of 3 embodiment 14~20 of table
So as to which double-heptene-ethylene copolymer helps to strengthen low density polyethylene (LDPE) (LLDPE), high density polyethylene (HDPE)
(HDPE), the joint between crosslinked polyethylene (XLPE), improves product strength and rigidity.
Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention
Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and
Improvement is both fallen within the range of claimed invention.The protection domain of application claims by appended claims and its
Equivalent defines.
Claims (10)
1. a kind of high intensity rotational moulding polyethylene mixture, it is characterised in that its raw material is by linear low density polyethylene, high density
Polyethylene, double-heptene-ethylene copolymer, crosslinked polyethylene, plasticizer, coupling agent and stabilizer composition.
2. high intensity rotational moulding polyethylene mixture according to claim 1, it is characterised in that its material composition composition is pressed
Parts by weight are calculated as：50-60 parts of linear low density polyethylene, 6-8 parts of high density polyethylene (HDPE)s, 4-6 parts of double-heptene-ethylene copolymers
Thing, 20-25 part crosslinked polyethylene, 2-3 parts of plasticizer, 1-2 parts of coupling agents and 2-3 parts of stabilizers.
3. high intensity rotational moulding polyethylene mixture according to claim 2, it is characterised in that the crosslinked polyethylene
Material composition is by weight：50 parts of high density polyethylene (HDPE), 50 parts of low density polyethylene (LDPE), 2 parts of grafting agent, 0.5 part
Initiator, 0.2 part of catalyst and 0.2 part of antioxidant.
4. high intensity rotational moulding polyethylene mixture according to claim 3, it is characterised in that the crosslinked polyethylene
Density is 0.928-0.936g/cm3, melt flow rate (MFR) 1.5-2.5g/10min.
5. high intensity rotational moulding polyethylene mixture according to claim 4, it is characterised in that the linea low density gathers
The density of ethene is 0.918-0.930g/cm3, melt flow rate (MFR) 15-21g/10min, the density of the high density polyethylene (HDPE)
For 0.94-0.96g/cm3, melt flow rate (MFR) 1.5-2.5g/10min.
6. high intensity rotational moulding polyethylene mixture according to claim 5, it is characterised in that the low density polyethylene (LDPE)
Density be 0.918-0.926g/cm3, melt flow rate (MFR) 2.3-6.5g/10min.
7. high intensity rotational moulding polyethylene mixture according to claim 6, it is characterised in that the grafting agent is diformazan
Base vinyl methoxy silane, the initiator are cumyl peroxide, and the catalyst is dibutyl tin laurate, institute
Antioxidant is stated as 1010.
8. high intensity rotational moulding polyethylene mixture according to claim 7, it is characterised in that the plasticizer for oneself two
Sour dibutyl ester, the coupling agent are both arms silane coupling agent, and the stabilizer is triphenyl phosphite.
9. a kind of preparation method of high intensity rotational moulding polyethylene mixture, it is characterised in that including step：
S100 weighs the linear low density polyethylene of corresponding parts by weight, high density polyethylene (HDPE), double-heptene-ethylene copolymer, friendship
Joining polyethylene, plasticizer, coupling agent, stabilizer, melting is squeezed at 180-200 DEG C in the double screw extruder of a diameter of 100mm
Go out；
S200 sieves by Freezing smashing again, and the polyethylene mixture that particle diameter is less than 30 mesh is made.
10. preparation method according to claim 9, it is characterised in that the system of the crosslinked polyethylene in the step S100
It is standby to include step：
S110 weigh the high density polyethylene (HDPE) (HDPE) of corrresponding quality part, low density polyethylene (LDPE) (LDPE), grafting agent, initiator,
Catalyst, antioxidant are put into medium-speed vertical batch mixer and are uniformly mixed, and the rotating speed of batch mixer is 15-50rpm, and incorporation time is
3-5min；
The material mixed is added in Co rotating Twin Screw Extrusion comminutor and particle is made by S120, and Co rotating Twin Screw Extrusion is granulated
The technological parameter of machine is：160-200 DEG C of temperature, engine speed 300-500rpm, feeding rotating speed 50-100rpm, melt pressure
1.0-3.0MPa；
The particle made is put into drying box and carries out removal moisture drying by S130, and drying box temperature sets 80-90 DEG C, and drying time sets
Determine 1-2h；
Dried particle is ground and fine powder product is made by S140 in plastic grinder, and the technological parameter of flour mill is feeding speed
150-250Kg/h is spent, speed of grinding plate 3000-5000rpm, powder outlet temperature≤70 DEG C, vibrating screen is 30-40 mesh sieve nets, system
Obtain crosslinked polyethylene.
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| CN115556450A (en) * | 2022-09-26 | 2023-01-03 | 湖北慧狮塑业股份有限公司 | Ultra-thin polyolefin dry film protective film |
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