CN104292596B - A kind of polyethylene composition - Google Patents
A kind of polyethylene composition Download PDFInfo
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- CN104292596B CN104292596B CN201310303469.8A CN201310303469A CN104292596B CN 104292596 B CN104292596 B CN 104292596B CN 201310303469 A CN201310303469 A CN 201310303469A CN 104292596 B CN104292596 B CN 104292596B
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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
- 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
- C08L23/06—Polyethene
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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Abstract
The invention discloses a kind of polyethylene composition, said composition contains double-peak high-density polytene and LLDPE, wherein, the density of the double-peak high-density polytene is 0.950 0.960g/cm3, weight average molecular weight is 200,000 600000, and molecular weight distributing index is 15 50；The density of the LLDPE is 0.915 0.940g/cm3, the melt mass flow rate determined according to GB/T3682 2000 of the LLDPE is 0.5 5g/10min, and relative to the double-peak high-density polytene of 100 parts by weight, the content of the LLDPE is 5 55 parts by weight.Polyethylene composition provided by the invention has environmental stress cracking resistance, good mechanical performance and the low-temperature impact-resistant performance significantly improved.
Description
Technical field
The present invention relates to a kind of polyethylene composition.
Background technology
Polythene material compared with traditional anti-corrosion material, has excellent machinery strong as a kind of novel anticorrosion material
The performance such as degree, electrical insulating property, wear-resistant, chemically-resistant.It is likely to be yet with its use environment outdoor or severe
In environment, therefore also needing to polythene material, there is excellent ultraviolet aging to be resistant to and ESC performance, consider simultaneously
Cladding to cold district needs, while is also required to polythene material and has excellent low-temperature impact-resistant performance.
A kind of polyvinyl composition of cladding metal pipe and preparation method thereof is disclosed in CN1186821A.The polyethylene group
It by the density that constituent content is 70-95 parts is 0.930-0.949g/cm that compound, which is,3And melt flow rate (MFR) is（2.16kg）
0.05-1.0g/10min polyethylene（A）, it is 0.890-0.930g/cm with density that constituent content is 5-30 parts3, melt flow
Dynamic speed（2.16kg）For 1.0-10.0g/10min polyethylene（B）Mix, and add antioxidant, ultraviolet absorber, stably
Agent and form.The polymer has good mechanical performance, low-temperature impact-resistant performance and heatproof air aging performance.But the polyethylene
The raising of the environmental stress cracking resistance of composition is not notable.
Therefore, develop it is a kind of have the environmental stress cracking resistance significantly improved simultaneously with good mechanical performance with
The problem of polyethylene composition of low-temperature impact-resistant performance is still a urgent need to resolve.
The content of the invention
The purpose of the present invention is to overcome the shortcomings of that prior art is above-mentioned to provide a kind of polyethylene composition.
To achieve these goals, the present invention provides a kind of polyethylene composition, and said composition contains double-peak high-density and gathered
Ethene and LLDPE, wherein, the density of the double-peak high-density polytene is 0.950-0.960g/cm3, weight is
Molecular weight is 200000-600000, molecular weight distributing index 15-50；The density of the LLDPE is
0.915-0.940g/cm3, melt mass flow rate that the LLDPE determines according to GB/T3682-2000
For 0.5-5g/10min；Relative to the double-peak high-density polytene of 100 parts by weight, the LLDPE contains
Measure as 5-55 parts by weight.
Polyethylene composition provided by the invention has the environmental stress cracking resistance significantly improved, good mechanical properties
With low-temperature impact-resistant performance.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Embodiment
The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The present invention provides a kind of polyethylene composition, and said composition contains double-peak high-density polytene and linea low density gathers
Ethene, wherein, the density of the double-peak high-density polytene is 0.950-0.960g/cm3, weight average molecular weight 200000-
600000, molecular weight distributing index 15-50；The density of the LLDPE is 0.915-0.940g/cm3, institute
It is 0.5-5g/10min to state the melt mass flow rate that LLDPE determines according to GB/T3682-2000；Relatively
In the double-peak high-density polytene of 100 parts by weight, the content of the LLDPE is 5-55 parts by weight.
In the present invention, the double-peak high-density polytene refers to that molecular weight distribution is in the high-density polyethylene of bimodal pattern
Alkene.Molecular weight distributing index refers to the ratio of weight average molecular weight and number-average molecular weight.
It was found by the inventors of the present invention that it is in the high density polyethylene (HDPE) of bimodal pattern by molecular weight distribution（Density is 0.950-
0.960g/cm3, weight average molecular weight 200000-600000, molecular weight distributing index 15-50）With LLDPE
（Density is 0.915-0.940g/cm3, the melt quality determined according to GB/T3682-2000 of the LLDPE
Flow rate is 0.5-5g/10min）With relative to the double-peak high-density polytene of 100 parts by weight, the linea low density
The content of polyethylene is used cooperatively the component as polyethylene composition for the proportioning of 5-55 parts by weight, can significantly improve poly- second
The environmental stress cracking resistance of ene compositions.
In the present invention, the density of the double-peak high-density polytene has to the performance of the polyethylene composition of the present invention
Significant impact, specifically, when the density of the double-peak high-density polytene is higher（Density is higher than 0.960g/cm3）It is or relatively low
（Density is less than 0.950）When, the environmental stress cracking resistance and mechanical property of polyethylene composition can be significantly affected.It is excellent
In the case of choosing, the density of the double-peak high-density polytene is 0.950-0.954g/cm3。
In the present invention, the weight average molecular weight of the double-peak high-density polytene and its molecular weight distributing index are to the present invention
The performance of polyethylene composition there is significant impact, specifically, when the weight average molecular weight of the double-peak high-density polytene
And its molecular weight distributing index is relatively low（Weight average molecular weight is less than 200000, and molecular weight distributing index is less than 15）Or the bimodal height
The weight average molecular weight and its molecular weight distributing index of density polyethylene are higher（Weight average molecular weight is higher than 600000, molecular weight distribution
Index is higher than 50）When, the environmental stress cracking resistance and mechanical property of polyethylene composition all do not have good effect.It is excellent
In the case of choosing, the weight average molecular weight of the double-peak high-density polytene is 200000-500000, molecular weight distributing index 15-
30。
According to the present invention, the double-peak high-density polytene and linear low density polyethylene are contained in the polyethylene composition
Alkene, therefore, the density of the LLDPE also have significant shadow to the performance of the polyethylene composition of the present invention
Ring, under preferable case, the density of the LLDPE is 0.915-0.930g/cm3。
In addition, the LLDPE according to the melt mass flow rate that GB/T3682-2000 is determined to institute
The size for stating the melt mass flow rate determined according to GB/T3682-2000 of polyethylene composition has significant impact,
Under preferable case, the melt mass flow rate determined according to GB/T3682-2000 of the LLDPE is 1-
3g/10min。
In the present invention, the double-peak high-density polytene and the linea low density are contained in the polyethylene composition
Polyethylene, relative to the double-peak high-density polytene of 100 parts by weight, the content of the LLDPE is 5-55
Parts by weight, it is contemplated that the content of the double-peak high-density polytene and the LLDPE is to polyethylene composition physical property
Can influence, under preferable case, relative to the double-peak high-density polytene of 100 parts by weight, the linear low density polyethylene
The content of alkene is 5-50 parts by weight.
According to the present invention, various double-peak high-densities that the double-peak high-density polytene is well known to those skilled in the art
Polyethylene, under preferable case, the double-peak high-density polytene be ethylene-propylene copolymer, ethylene-butene copolymer, ethene-
One or more in hexene copolymer and ethylene-octene copolymer.
According to the present invention, the LLDPE can be well known to those skilled in the art various linear low
Density polyethylene, under preferable case, the LLDPE is ethene-alpha-olefin copolymer, for example, can be ethene-
Butylene copolymer and/or ethylene-hexene co-polymers.
In the present invention, the weight average molecular weight to the LLDPE and its molecular weight distributing index are without spy
Other restriction, it can be changed in wider scope, it is contemplated that the LLDPE is to polyethylene composition physical performance
Influence, under preferable case, the weight average molecular weight of the LLDPE is 50000-300000, and molecular weight distribution refers to
Number is 2-10；In the case of further preferably, the weight average molecular weight of the LLDPE is 100000-200000, point
Son amount profile exponent is 3-6.
In the present invention, the measure of density is with reference to GB/T1033-2008 methods measure.The measure reference of weight average molecular weight
ASTM D6474-99 (2006) method determines, and measurement temperature is 135 DEG C, and measure solvent is trichloro-benzenes；Molecular weight distributing index
Measure determines with reference to ASTM D6474-99 (2006) method, and measurement temperature is 135 DEG C, and measure solvent is trichloro-benzenes；Melt quality
The measure of flow rate includes with reference to GB/T3682-2000 methods measure, condition determination：Measurement temperature is 190 DEG C, and load is
2.16kg。
According to the present invention, in order to assign polyethylene composition more premium properties, under preferable case, the polyethylene group
Antioxidant, light stabilizer and pigment can also be contained in compound.
In the present invention, to the dosage of the antioxidant, there is no particular limitation, and specific dosage can be according to ability
The conventional amount used in domain is selected.It is described anti-relative to the double-peak high-density polytene of 100 parts by weight under preferable case
The content of oxygen agent is 0.01-2 parts by weight；In the case of further preferably, gather relative to the double-peak high-density of 100 parts by weight
Ethene, the content of the antioxidant is 0.05-1 parts by weight.
In the present invention, the effect of the antioxidant is to suppress or delay polyethylene composition thermal oxide in atmosphere.Cause
This, the various antioxidant well known to those skilled in the art that can be functioned as described above are suitable for the present invention.
In the case of, according to the invention it is preferred to, the antioxidant is Hinered phenols antioxidant and/or phosphorous acid esters antioxygen
Agent.The Hinered phenols antioxidant for example can be four [β-(3,5- di-tert-butyl-hydroxy phenyls) propionic acid] pentaerythritol esters
（Such as antioxidant 1010）, 2,2'- thiobis [3- (3,5- di-tert-butyl-hydroxy phenyls) ethyl propionate]（Such as antioxidant
1035）, 1,3,5- trimethyls -2,4,6- three (3,5- di-t-butyl -4- hydroxyphenylmethyls) benzene（Such as antioxidant 1330）Deng.It is described
Phosphite ester kind antioxidant for example can be three (2,4- di-t-butyls) phenyl-phosphites（Such as irgasfos 168）, it is double（The uncles of 2,4- bis-
Butyl phenyl）Pentaerythritol diphosphites（Such as antioxidant 626）Deng.
In the present invention, to the dosage of the light stabilizer, there is no particular limitation, and specific dosage can be according to ability
The conventional amount used in domain is selected.Under preferable case, relative to the double-peak high-density polytene of 100 parts by weight, the light
The content of stabilizer is 0.01-2 parts by weight, in the case of further preferred, is gathered relative to the double-peak high-density of 100 parts by weight
Ethene, the content of the light stabilizer is 0.05-1 parts by weight.
In the present invention, the effect of the light stabilizer is to suppress or delay the photooxidation of the polyethylene composition
Reduction or light aging.Therefore, the various light stabilizers well known to those skilled in the art that can be functioned as described above are applied to
In the present invention.
Under preferable case, the light stabilizer is hindered amine light stabilizer.The hindered amine light stabilizer for example may be used
Think poly-succinic (4- hydroxyl -2,2,6,6- tetramethyl -1- piperidine ethanols) ester（Such as light stabilizer 622）And/or poly- [[6-
[(1,1,3,3- tetramethyl butyls) amine] -1,3,5- triazine -2,4- diyls] [(2,2,6,6- tetramethyl -4- piperidines) imines] -1,
The dihexyls of 6- bis- [(2,2,6,6- tetramethyl -4- piperidines) imines]]]（Such as light stabilizer 944）.
There is polyethylene composition described in the present invention, there is no particular limitation to the dosage of the pigment, specifically
Dosage can determine according to the shade for the polyethylene composition for wanting to obtain.Under preferable case, relative to 100 parts by weight
The double-peak high-density polytene, the content of the pigment is 0.001-5 parts by weight；In the case of further preferably, relative to
The double-peak high-density polytene of 100 parts by weight, the content of the pigment is 0.01-1 parts by weight.
According to the present invention, to the species of the pigment, there is no particular limitation, can be according to the poly- second for finally wanting to obtain
The color of ene compositions is reasonably selected from various pigment well-known to those skilled in the art, such as can be charcoal
One or more in black, azo condensation pigment, monoazo pigment, disazo pigment, phthalocyanine blue pigment and dark green pigment.
According to the present invention, the preparation method of the polyethylene composition is referred to prior art to implement, such as will be upper
State each component that polyethylene composition contains be put into homogenizer be well mixed after, through double screw extruder incorporate mix,
Extruding pelletization.The rotating speed of high-speed stirred can be 1000-2500rpm.The process conditions of extrusion can include：Extrusion temperature is
210-220 DEG C, screw speed 200-350rpm.In the present invention, high-speed stirred uses the model of Beijing plastics machinery factory
GH-10DQ high-speed mixer is implemented；Extruding pelletization is implemented using the model ZSK-30 of WP companies double screw extruder.
The present invention will be described in detail by way of examples below.
In following examples, the method for testing being related to is as follows：
1st, the measure of the density of polyethylene composition is with reference to GB/T1033-2008 methods.
2nd, the measure of the melt mass flow rate of polyethylene composition is with reference to GB/T3682-2000 methods, condition determination
Including：Measurement temperature is 190 DEG C, load 2.16kg.
3rd, the elongation at break of the tensile yield strength of polyethylene composition, elongation at break and light aging 1000 hours
Measure is with reference to GB/T1040-2006 methods.
4th, the measure of the environmental stress cracking resistance of polyethylene composition is with reference to GB1842-2008 methods.
5th, the measure of the impact brittle temperature of polyethylene composition is with reference to GB/T5470-2008 methods.
6th, the measure of the oxidation induction time of polyethylene composition is carried out with reference to GB17391-1998 methods at 210 DEG C
Measure.
Embodiment 1
The present embodiment is used to illustrate polyethylene composition provided by the invention.
The density of 90 parts by weight is 0.952g/cm3, molecular vibrational temperature index（MWD）For 20, weight average molecular weight（Mw）For
250000 double-peak high-density polytene A1（Borealis AG, trade mark 3494LS）, the density of 10 parts by weight is 0.920g/
cm3, melt flow rate (MFR) be（2.16kg）The ethene that 2g/10min, molecular weight distributing index 4, weight average molecular weight are 120000
With the LLDPE B1 of 1- hervene copolymers（Tianjin Petrochemical Company, the trade mark 9020）, 0.2 parts by weight four [β-(3,
5- di-tert-butyl-hydroxy phenyls) propionic acid] pentaerythritol ester, three (2,4- di-t-butyl) phenyl-phosphites of 0.2 parts by weight,
Poly-succinic (4- hydroxyls -2,2,6,6- tetramethyl -1- piperidine ethanols) ester of 0.2 parts by weight, in homogenizer（Beijing plastics
Company of machinery plant, model GH-10DQ are same as below）In be well mixed after, the rotating speed of high-speed stirred is 1191rpm, through double spiral shells
Bar extruder（WP companies, model ZSK30 are same as below）Melting mixing, extruding pelletization, extrusion temperature are 210 DEG C, and screw rod turns
Speed is 220rpm.The performance of the polyethylene composition of gained is measured, measurement result is shown in Table 1.
Comparative example 1
Polyethylene composition is prepared using the method for embodiment 1, except that, density is used as 0.949g/cm3, point
Son amount profile exponent is 5, the high density polyethylene (HDPE) D1 for the Unimodal Distribution that weight average molecular weight is 100000（Yanshan Petrochemical company, board
Number it is 2300XM）Instead of the double-peak high-density polytene A1 in embodiment 1.The performance measurement result of the polyethylene composition of gained
It is shown in Table 1.
Comparative example 2
Polyethylene composition is prepared using the method for embodiment 1, except that, density is used as 0.962g/cm3It is double
Peak height density polyethylene D2 replaces the double-peak high-density polytene A1 in embodiment 1.The performance of the polyethylene composition of gained is surveyed
Surely it the results are shown in Table 1.
Embodiment 2
The present embodiment is used to illustrate polyethylene composition provided by the invention.
The density of 95 parts by weight is 0.950g/cm3, molecular vibrational temperature index is 15, and weight average molecular weight is 200000
Double-peak high-density polytene A2（Oil of SPC company, trade mark YGH041）, the density of 5 parts by weight is 0.930g/cm3, melt
Flow rate is（2.16kg）1g/10min, molecular weight distributing index（MWD）For 4, weight average molecular weight（Mw）For 150000 second
The LLDPE B2 of alkene and 1- hervene copolymers（Tianjin Petrochemical Company, trade mark DFDA7094）, the four of 0.2 parts by weight
[β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, pair of 0.2 parts by weight（2,4- di-tert-butyl-phenyls）Season
Penta tetrol diphosphites, poly-succinic (4- hydroxyls -2,2,6,6- tetramethyl -1- piperidine ethanols) ester of 0.4 parts by weight, 0.05
Parts by weight pigment yellow 191：1, after being well mixed in homogenizer, the rotating speed of high-speed stirred is 1191rpm, is squeezed through twin-screw
Go out machine melting mixing, extruding pelletization, extrusion temperature is 215 DEG C, screw speed 220rpm.To the polyethylene composition of gained
Performance is measured, and measurement result is shown in Table 1.
Embodiment 3
The present embodiment is used to illustrate polyethylene composition provided by the invention.
The density of 70 parts by weight is 0.954g/cm3, molecular vibrational temperature index is 25, and weight average molecular weight is 400000
Double-peak high-density polytene A3（Yanshan Petrochemical, 7800M）, the density of 30 parts by weight is 0.915g/cm3, melt flow rate (MFR) be
（2.16kg）3g/10min, molecular weight distributing index（MWD）For 4, weight average molecular weight（Mw）For 100000 ethene and 1- butylene
The LLDPE B3 of copolymerization（Qilu Petrochemical, trade mark DFDA-7029）, 2, the 2'- thiobis of 0.08 parts by weight（3-
(3,5- di-tert-butyl-hydroxy phenyls) ethyl propionate）, poly-succinic (4- hydroxyls -2,2,6, the 6- tetramethyls of 0.08 parts by weight
Base -1- piperidine ethanols) ester, after being well mixed in homogenizer, the rotating speed of high-speed stirred is 1191rpm, is squeezed through twin-screw
Go out machine melting mixing, extruding pelletization, extrusion temperature is 220 DEG C, screw speed 220rpm.To the polyethylene composition of gained
Performance is measured, and measurement result is shown in Table 1.
Embodiment 4
The present embodiment is used to illustrate polyethylene composition provided by the invention.
The density of 90 parts by weight is 0.950g/cm3, molecular vibrational temperature index is 20, and weight average molecular weight is 600000
Double-peak high-density polytene A4（Yanshan Petrochemical, 9050）, the density of 10 parts by weight is 0.920g/cm3, melt flow rate (MFR) be
（2.16kg）2g/10min, molecular weight distributing index（MWD）For 4, weight average molecular weight（Mw）For 120000 ethene and 1- hexenes
The LLDPE B4 of copolymerization（Plant of Tianjin Petrochemical Company, 9020）, the 1 of 0.8 parts by weight, 3,5- trimethyls -2,4,6- tri- (3,5-
Di-t-butyl -4- hydroxyphenylmethyls) benzene, poly-succinic (4- hydroxyls -2,2,6, the 6- tetramethyl -1- piperidines second of 0.2 parts by weight
Alcohol) ester, after being well mixed in homogenizer, the rotating speed of high-speed stirred is 1191rpm, is melted through double screw extruder mixed
Close, extruding pelletization, extrusion temperature is 210 DEG C, screw speed 220rpm.The performance of the polyethylene composition of gained is surveyed
Fixed, measurement result is shown in Table 1.
Embodiment 5
The present embodiment is used to illustrate polyethylene composition provided by the invention.
The density 0.952g/cm of 80 parts by weight3, molecular vibrational temperature index is 20, pair that weight average molecular weight is 250000
Peak height density polyethylene A5（Borealis, 3495LS）, the density of 20 parts by weight is 0.920g/cm3, melt flow rate (MFR) be
（2.16kg）5g/10min, molecular weight distributing index（MWD）For 4, weight average molecular weight（Mw）It is total to for 50000 ethene and 1- hexenes
Poly- LLDPE B5（Hyundai, ST518）, the antioxidant 2 of 0.6 parts by weight, 2'- thiobis（3- (3,5- bis-
Tert-butyl-hydroxy phenyl) ethyl propionate）, light stabilizer poly-succinic (4- hydroxyls -2,2,6, the 6- tetramethyls of 0.2 parts by weight
Base -1- piperidine ethanols) ester, the paratonere 254 of 0.15 parts by weight, after being well mixed in homogenizer, high-speed stirred turns
Speed is 1191rpm, and through double screw extruder melting mixing, extruding pelletization, extrusion temperature is 220 DEG C, screw speed 220rpm.
The performance of the polyethylene composition of gained is measured, measurement result is shown in Table 1.
Embodiment 6
The present embodiment is used to illustrate polyethylene composition provided by the invention.
The density of 80 parts by weight is 0.952g/cm3, molecular vibrational temperature index is 20, and weight average molecular weight is 250000
Double-peak high-density polytene A6（Borealis, 3495LS）, the density of 20 parts by weight is 0.939g/cm3, melt flow rate (MFR) be
（2.16kg）2g/10min, molecular weight distributing index（MWD）For 3, weight average molecular weight（Mw）For 100000 ethene and 1- hexenes
The LLDPE B6 of copolymerization（Daqing petrochemical, DNDC-7150）, the antioxidant four of 0.3 parts by weight（β-（3,5- bis- uncles
Butyl -4- hydroxy phenyls）Propionic acid）Pentaerythritol ester, antioxidant three (2,4- di-t-butyl) phenyl-phosphite of 0.3 parts by weight,
The antioxidant 2,2'- thiobis of 0.1 parts by weight（3- (3,5- di-tert-butyl-hydroxy phenyls) ethyl propionate）, 0.2 parts by weight
Light stabilizer it is poly- [[6- [(1,1,3,3- tetramethyl butyls) amine] -1,3,5- triazine -2,4- diyls] [(2,2,6,6- tetramethyls -
4- piperidines) imines] two dihexyls [(2,2,6,6- tetramethyl -4- piperidines) imines] of -1,6-]]（Light stabilizer 944）, at a high speed
After stirrer for mixing is uniform, the rotating speed of high-speed stirred is 1191rpm, through double screw extruder melting mixing, extruding pelletization, is squeezed
It is 220 DEG C to go out temperature, screw speed 220rpm.The performance of the polyethylene composition of gained is measured, measurement result is shown in
Table 1.
Embodiment 7
The present embodiment is used to illustrate polyethylene composition provided by the invention.
It is 0.955g/cm by the density of 65 parts by weight3, molecular vibrational temperature index is 20, weight average molecular weight 200000
Double-peak high-density polytene A7（Yan Hua, 6100M）, the density of 35 parts by weight is 0.920g/cm3, melt flow rate (MFR) be
（2.16kg）2g/10min, molecular weight distributing index（MWD）For 4, weight average molecular weight（Mw）For 120000 ethene and 1- hexenes
It is copolymerized LLDPE B7（Plant of Tianjin Petrochemical Company, 9020）, the antioxidant four of 0.2 parts by weight（β-（3,5- di-t-butyl -4-
Hydroxy phenyl）Propionic acid）Pentaerythritol ester, antioxidant three (2,4- di-t-butyl) phenyl-phosphite of 0.2 parts by weight, 0.4 weight
Poly- [[6- [(1,1,3,3- tetramethyl butyls) amine] -1,3,5- triazine -2,4- diyls] [(2,2,6,6- tetramethyl -4- piperazines of part
Pyridine) imines] two dihexyls [(2,2,6,6- tetramethyl -4- piperidines) imines] of -1,6-]]（Light stabilizer 944）0.08 parts by weight face
Material basket 15：3, after being well mixed in homogenizer, the rotating speed of high-speed stirred is 1191rpm, is melted through double screw extruder
Mixing, extruding pelletization, extrusion temperature are 215 DEG C, screw speed 220rpm.The performance of the polyethylene composition of gained is carried out
Measure, measurement result are shown in Table 1.
Table 1
Polyethylene composition provided by the invention has the environmental stress resistance significantly improved it can be seen from the result of table 1
Cracking performance, excellent physical and mechanical properties, low-temperature impact-resistant performance and excellent heatproof air aging performance, good light are steady
Qualitative energy.
The preferred embodiment of the present invention described in detail above, still, the present invention are not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (8)
1. a kind of polyethylene composition, the composition by double-peak high-density polytene, LLDPE, antioxidant,
Light stabilizer and pigment composition, it is characterised in that the density of the double-peak high-density polytene is 0.950-0.960g/cm3, weight
Average molecular weight is 200000-600000, molecular weight distributing index 15-50；The density of the LLDPE is
0.915-0.940g/cm3, melt mass flow rate that the LLDPE determines according to GB/T 3682-2000
For 0.5-5g/10min；Relative to the double-peak high-density polytene of 100 parts by weight, the LLDPE contains
Measure as 5-55 parts by weight, the double-peak high-density polytene be ethylene-propylene copolymer, ethylene-butene copolymer, ethene-oneself
One or more in alkene copolymer and ethylene-octene copolymer, the LLDPE are ethylene-butene copolymer
And/or ethylene-hexene co-polymers, the weight average molecular weight of the LLDPE is 50000-300000, and molecular weight divides
Cloth index is 2-10.
2. composition according to claim 1, wherein, the density of the double-peak high-density polytene is 0.950-
0.954g/cm3, weight average molecular weight 200000-500000, molecular weight distributing index 15-30；The linear low density polyethylene
The density of alkene is 0.915-0.930g/cm3, melt matter that the LLDPE determines according to GB/T 3682-2000
Amount flow rate is 1-3g/10min, and relative to the double-peak high-density polytene of 100 parts by weight, the linea low density gathers
The content of ethene is 5-50 parts by weight.
3. composition according to claim 1, wherein, relative to the double-peak high-density polytene of 100 parts by weight, institute
The content for stating antioxidant is 0.01-2 parts by weight, and the content of the light stabilizer is 0.01-2 parts by weight, the content of the pigment
For 0.001-5 parts by weight.
4. composition according to claim 3, wherein, relative to the double-peak high-density polytene of 100 parts by weight, institute
The content for stating antioxidant is 0.05-1 parts by weight, and the content of the light stabilizer is 0.05-1 parts by weight, the content of the pigment
For 0.01-1 parts by weight.
5. the composition according to claim 3 or 4, wherein, the antioxidant is that Hinered phenols and/or phosphorous acid esters resist
Oxygen agent.
6. composition according to claim 5, wherein, the antioxidant is four [β-(3,5- di-t-butyl -4- hydroxy benzenes
Base) propionic acid] pentaerythritol ester, 2,2 '-thiobis [3- (3,5- di-tert-butyl-hydroxy phenyls) ethyl propionate], 1,3,5- tri-
Methyl -2,4,6- three (3,5- di-t-butyl -4- hydroxyphenylmethyls) benzene, three (2,4- di-tert-butyl-phenyls) phosphite esters and double
One or more in (2,4- di-tert-butyl-phenyls) pentaerythritol diphosphites.
7. the composition according to claim 3 or 4, wherein, the light stabilizer is hindered amine light stabilizer.
8. composition according to claim 7, wherein, the light stabilizer be poly-succinic (4- hydroxyls -2,2,6,6- tetra-
Methyl isophthalic acid-piperidine ethanol) ester and/or poly- [[6- [(1,1,3,3- tetramethyl butyls) amine] -1,3,5- triazine -2,4- diyls]
The dihexyls [(2,2,6,6- tetramethyl -4- piperidines) imines] of [(2,2,6,6- tetramethyl -4- piperidines) imines] -1,6- two].
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| CN105237853A (en) * | 2015-10-29 | 2016-01-13 | 山东融汇管通股份有限公司 | Cracking resistance modified polyethylene material and preparation method therefor |
| CN105778240B (en) * | 2016-05-05 | 2018-11-06 | 日丰科技有限公司 | A kind of chlorine-resistant polyethylene pipe and preparation method thereof |
| CN109575408A (en) * | 2017-09-28 | 2019-04-05 | 中国石化扬子石油化工有限公司 | A kind of geomembrane polyethylene composition |
| CN109705422A (en) * | 2017-10-26 | 2019-05-03 | 中国石油化工股份有限公司 | A kind of polyethylene film for earthwork of resisting environmental stress and cracking and preparation method thereof |
| CN111100362A (en) * | 2018-10-25 | 2020-05-05 | 中国石油化工股份有限公司 | Bimodal polyethylene resin for large-caliber thick-wall low-sag pipe and preparation method thereof |
| CN109679180B (en) * | 2018-11-23 | 2021-10-22 | 金旸（厦门）新材料科技有限公司 | Special material for injection molding urea box and preparation method thereof |
| CN109897266B (en) * | 2019-03-26 | 2021-06-25 | 上海旗华水上工程建设股份有限公司 | Weather-resistant anti-aging polyethylene plastic suitable for water surface contact |
| CN111995813B (en) * | 2020-08-26 | 2023-02-28 | 奥美凯聚合物（苏州）有限公司 | Polyethylene composite material and preparation method and application thereof |
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