CN104292596A - Polyethylene composition - Google Patents
Polyethylene composition Download PDFInfo
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- CN104292596A CN104292596A CN201310303469.8A CN201310303469A CN104292596A CN 104292596 A CN104292596 A CN 104292596A CN 201310303469 A CN201310303469 A CN 201310303469A CN 104292596 A CN104292596 A CN 104292596A
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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 polyethylene composition. The composition comprises doublet high density polyethylene and linear low density polyethylene, wherein the doublet high density polyethylene has density of 0.950-0.960 g / cm<3>, weight average molecular weight of 200000-600000 and molecular weight distribution index of 15-50; and the linear low density polyethylene has density of 0.915-0.940g / cm<3>, melt flow rate of 0.5-5 g / 10min based on the GB / T3682-2000; and relative to 100 parts by weight of the doublet high density polyethylene, the content of the linear low density polyethylene is 5-55 parts by weight. The polyethylene composition provided by the invention has substantially enhanced environment resistant stress cracking performance, good machinery performance and low temperature impact resistance performance.
Description
Technical field
The present invention relates to a kind of polyethylene composition.
Background technology
Polythene material, as a kind of novel anticorrosion material, compared with traditional impregnating material, has the performances such as excellent physical strength, electrical insulating property, wear-resistant, chemically-resistant.But due to its environment for use be likely in the open or in rugged environment, therefore polythene material is also needed to have excellent ultraviolet aging ability and environmental stress cracking performance, consider the coated needs of cold district simultaneously, also need polythene material to have excellent low-temperature impact-resistant performance simultaneously.
A kind of polyvinyl composition of cladding metal pipe and preparation method thereof is disclosed in CN1186821A.This polyethylene composition is the density being 70-95 part by component concentration is 0.930-0.949g/cm
3and melt flow rate (MFR) is the polyethylene (A) of (2.16kg) 0.05-1.0g/10min, the density being 5-30 part with component concentration is 0.890-0.930g/cm
3, the polyethylene (B) that melt flow rate (MFR) (2.16kg) is 1.0-10.0g/10min mixes mutually, and adds oxidation inhibitor, uv-absorbing agent, stablizer and forming.This polymkeric substance has good mechanical property, low-temperature impact-resistant performance and heatproof air aging performance.But the raising of the environmental stress cracking resistance of this polyethylene composition is not remarkable.
Therefore, develop and a kind ofly there is the polyethylene composition that the environmental stress cracking resistance significantly improved has good mechanical property and a low-temperature impact-resistant performance be simultaneously still the problem that is needed badly solution.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art and a kind of polyethylene composition is provided.
To achieve these goals, the invention provides a kind of polyethylene composition, said composition contains double-peak high-density polytene and linear low density polyethylene, and wherein, the density of described double-peak high-density polytene is 0.950-0.960g/cm
3, weight-average molecular weight is 200000-600000, and molecular weight distributing index is 15-50; The density of described linear low density polyethylene is 0.915-0.940g/cm
3, described linear low density polyethylene is 0.5-5g/10min according to the melt mass flow rate that GB/T3682-2000 measures; Relative to the described double-peak high-density polytene of 100 weight parts, the content of described linear low density polyethylene is 5-55 weight part.
Polyethylene composition provided by the invention has the environmental stress cracking resistance, good mechanical properties and the low-temperature impact-resistant performance that significantly improve.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of polyethylene composition, said composition contains double-peak high-density polytene and linear low density polyethylene, and wherein, the density of described double-peak high-density polytene is 0.950-0.960g/cm
3, weight-average molecular weight is 200000-600000, and molecular weight distributing index is 15-50; The density of described linear low density polyethylene is 0.915-0.940g/cm
3, described linear low density polyethylene is 0.5-5g/10min according to the melt mass flow rate that GB/T3682-2000 measures; Relative to the described double-peak high-density polytene of 100 weight parts, the content of described linear low density polyethylene is 5-55 weight part.
In the present invention, described double-peak high-density polytene refers to the high density polyethylene(HDPE) that molecular weight distribution is bimodal pattern.Molecular weight distributing index refers to the ratio of weight-average molecular weight and number-average molecular weight.
The present inventor finds, is that (density is 0.950-0.960g/cm for the high density polyethylene(HDPE) of bimodal pattern by molecular weight distribution
3, weight-average molecular weight is 200000-600000, and molecular weight distributing index is 15-50) and (density is 0.915-0.940g/cm with linear low density polyethylene
3described linear low density polyethylene according to GB/T3682-2000 measure melt mass flow rate be 0.5-5g/10min) with the described double-peak high-density polytene relative to 100 weight parts, the content of described linear low density polyethylene be the proportioning of 5-55 weight part with the use of the component as polyethylene composition, significantly can improve the environmental stress cracking resistance of polyethylene composition.
In the present invention, the performance of density on polyethylene composition of the present invention of described double-peak high-density polytene has significant impact, and particularly, when the density of described double-peak high-density polytene is higher, (density is higher than 0.960g/cm
3) or (density is lower than 0.950) on the low side time, the environmental stress cracking resistance of polyethylene composition and mechanical property can be subject to remarkably influenced.Under preferable case, the density of described double-peak high-density polytene is 0.950-0.954g/cm
3.
In the present invention, the weight-average molecular weight of described double-peak high-density polytene and the performance of molecular weight distributing index on polyethylene composition of the present invention thereof have significant impact, particularly, when the weight-average molecular weight of described double-peak high-density polytene and molecular weight distributing index thereof, on the low side (weight-average molecular weight is lower than 200000, molecular weight distributing index is lower than 15) or the weight-average molecular weight of described double-peak high-density polytene and molecular weight distributing index thereof higher (weight-average molecular weight is higher than 600000, molecular weight distributing index is higher than 50) time, the environmental stress cracking resistance of polyethylene composition and mechanical property do not have good effect.Under preferable case, the weight-average molecular weight of described double-peak high-density polytene is 200000-500000, and molecular weight distributing index is 15-30.
According to the present invention, containing described double-peak high-density polytene and linear low density polyethylene in described polyethylene composition, therefore, the density of described linear low density polyethylene also has significant impact to the performance of polyethylene composition of the present invention, under preferable case, the density of described linear low density polyethylene is 0.915-0.930g/cm
3.
In addition, the size of melt mass flow rate on the melt mass flow rate according to GB/T3682-2000 mensuration of described polyethylene composition that described linear low density polyethylene measures according to GB/T3682-2000 has significant impact, under preferable case, described linear low density polyethylene according to GB/T3682-2000 measure melt mass flow rate be 1-3g/10min.
In the present invention, containing described double-peak high-density polytene and described linear low density polyethylene in described polyethylene composition, relative to the described double-peak high-density polytene of 100 weight parts, the content of described linear low density polyethylene is 5-55 weight part, consider the impact of the content of described double-peak high-density polytene and described linear low density polyethylene on polyethylene composition physical performance, under preferable case, relative to the described double-peak high-density polytene of 100 weight parts, the content of described linear low density polyethylene is 5-50 weight part.
According to the present invention, the various double-peak high-density polytenes that described double-peak high-density polytene is well known to those skilled in the art, under preferable case, described double-peak high-density polytene is one or more in ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene co-polymers and ethylene-octene copolymer.
According to the present invention, the various linear low density polyethylenes that described linear low density polyethylene can be well known to those skilled in the art, under preferable case, described linear low density polyethylene is ethene-alpha-olefin copolymer, such as, can be ethylene-butene copolymer and/or ethylene-hexene co-polymers.
In the present invention, to the weight-average molecular weight of described linear low density polyethylene and molecular weight distributing index thereof, there is no particular limitation, can change in wider scope, consider the impact of described linear low density polyethylene on polyethylene composition physical performance, under preferable case, the weight-average molecular weight of described linear low density polyethylene is 50000-300000, and molecular weight distributing index is 2-10; Under further preferable case, the weight-average molecular weight of described linear low density polyethylene is 100000-200000, and molecular weight distributing index is 3-6.
In the present invention, the mensuration of density measures with reference to GB/T1033-2008 method.The mensuration of weight-average molecular weight measures with reference to ASTM D6474-99 (2006) method, and measuring temperature is 135 DEG C, and mensuration solvent is trichlorobenzene; The mensuration of molecular weight distributing index measures with reference to ASTM D6474-99 (2006) method, and measuring temperature is 135 DEG C, and mensuration solvent is trichlorobenzene; The mensuration of melt mass flow rate measures with reference to GB/T3682-2000 method, and condition determination comprises: measuring temperature is 190 DEG C, and load is 2.16kg.
According to the present invention, in order to give polyethylene composition more premium properties, under preferable case, in described polyethylene composition, oxidation inhibitor, photostabilizer and pigment can also be contained.
In the present invention, to the consumption of described antioxidant, there is no particular limitation, and concrete consumption can be selected according to the conventional amount used of this area.Under preferable case, relative to the described double-peak high-density polytene of 100 weight parts, the content of described oxidation inhibitor is 0.01-2 weight part; Further in preferred situation, relative to the described double-peak high-density polytene of 100 weight parts, the content of described oxidation inhibitor is 0.05-1 weight part.
In the present invention, the effect of described oxidation inhibitor suppresses or delays polyethylene composition thermooxidizing in atmosphere.Therefore, the various oxidation inhibitor that can function as described above well known to those skilled in the art are all applicable in the present invention.
According to the present invention, under preferable case, described oxidation inhibitor is Hinered phenols antioxidant and/or phosphite ester kind antioxidant.Described Hinered phenols antioxidant can be such as four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester (as antioxidant 1010), 2,2'-thiobis [3-(3,5-di-tert-butyl-hydroxy phenyl) ethyl propionate] (as oxidation inhibitor 1035), 1,3,5-trimethylammonium-2,4,6-tri-(3,5-di-t-butyl-4-hydroxyphenylmethyl) benzene (as oxidation inhibitor 1330) etc.Described phosphite ester kind antioxidant can be such as three (2,4-di-t-butyl) phenyl-phosphite (as irgasfos 168), two (2,4-di-tert-butyl-phenyl) pentaerythritol diphosphites (as oxidation inhibitor 626) etc.
In the present invention, to the consumption of described photostabilizer, there is no particular limitation, and concrete consumption can be selected according to the conventional amount used of this area.Under preferable case, relative to the described double-peak high-density polytene of 100 weight parts, the content of described photostabilizer is 0.01-2 weight part, under further preferable case, relative to the described double-peak high-density polytene of 100 weight parts, the content of described photostabilizer is 0.05-1 weight part.
In the present invention, the effect of described photostabilizer is photoredox or the photoaging in order to suppress or delay described polyethylene composition.Therefore, the various photostabilizers that can function as described above well known to those skilled in the art are all applicable in the present invention.
Under preferable case, described photostabilizer is hindered amine light stabilizer.Described hindered amine light stabilizer can be such as poly-succinic (4-hydroxyl-2,2,6,6-tetramethyl--1-piperidine ethanol) ester (as photostabilizer 622) and/or poly-[[6-[(1,1,3,3-tetramethyl butyl) amine]-1,3,5-triazines-2,4-bis-base] [(2,2,6,6-tetramethyl--4-piperidines) imines]-1,6-bis-dihexyl [(2,2,6,6-tetramethyl--4-piperidines) imines]]] (as photostabilizer 944).
Have in polyethylene composition described in of the present invention, to the consumption of described pigment, there is no particular limitation, and concrete consumption can be determined according to the shade of the polyethylene composition wanting to obtain.Under preferable case, relative to the described double-peak high-density polytene of 100 weight parts, the content of described pigment is 0.001-5 weight part; Further in preferred situation, relative to the described double-peak high-density polytene of 100 weight parts, the content of described pigment is 0.01-1 weight part.
According to the present invention, to the kind of described pigment, there is no particular limitation, reasonably can select from various pigment well-known to those skilled in the art according to the color of the polyethylene composition finally wanting to obtain, such as, can be one or more in the dark green pigment of carbon black, azo condensation pigment, monoazo pigment, disazo pigment, phthalocyanine blue pigment and phthalein.
According to the present invention, the preparation method of described polyethylene composition can implement with reference to prior art, such as, each component that above-mentioned polyethylene composition contains put into after homogenizer mixes, incorporate mixing, extruding pelletization through twin screw extruder.The rotating speed of high-speed stirring can be 1000-2500rpm.The processing condition extruded can comprise: extrusion temperature is 210-220 DEG C, and screw speed is 200-350rpm.In the present invention, high-speed stirring adopt the model of Beijing plastics machinery factory be GH-10DQ high-speed mixer implement; The model of extruding pelletization employing WP company is the twin screw extruder enforcement of ZSK-30.
Below will be described the present invention by embodiment.
In following examples, the testing method related to is as follows:
1, the mensuration of the density of polyethylene composition is with reference to GB/T1033-2008 method.
2, the mensuration of the melt mass flow rate of polyethylene composition is with reference to GB/T3682-2000 method, and condition determination comprises: measuring temperature is 190 DEG C, and load is 2.16kg.
3, the mensuration of the tensile yield strength of polyethylene composition, elongation at break and the photoaging elongation at break of 1000 hours is with reference to GB/T1040-2006 method.
4, the mensuration of the environmental stress cracking resistance of polyethylene composition is with reference to GB1842-2008 method.
5, the mensuration of the impact embrittlement temperature of polyethylene composition is with reference to GB/T5470-2008 method.
6, the mensuration of the oxidation induction time of polyethylene composition is with reference to GB17391-1998 method, measures at 210 DEG C.
Embodiment 1
The present embodiment is for illustration of polyethylene composition provided by the invention.
The density of 90 weight parts is 0.952g/cm
3, molecular vibrational temperature index (MWD) is 20, and weight-average molecular weight (Mw) is double-peak high-density polytene A1(Borealis AG of 250000, and the trade mark is 3494LS), the density of 10 weight parts is 0.920g/cm
3, melt flow rate (MFR) is (2.16kg) 2g/10min, molecular weight distributing index is 4, weight-average molecular weight is the ethene of 120000 and the linear low density polyethylene B1(Tianjin Petrochemical Company of 1-hervene copolymer, the trade mark is 9020), four [β-(3 of 0.2 weight part, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, three (2 of 0.2 weight part, 4-di-t-butyl) phenyl-phosphite, poly-succinic (the 4-hydroxyl-2 of 0.2 weight part, 2, 6, 6-tetramethyl--1-piperidine ethanol) ester, in homogenizer (Beijing company of plastics machinery factory, model is GH-10DQ, identical below) in mix after, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder (WP company, model is ZSK30, identical below) melting mixing, extruding pelletization, extrusion temperature is 210 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Comparative example 1
Adopt the method for embodiment 1 to prepare polyethylene composition, difference is, employing density is 0.949g/cm
3, molecular weight distributing index is 5, weight-average molecular weight is the unimodal distribution of 100000 high density polyethylene(HDPE) D1(Yanshan Petrochemical company, the trade mark is 2300XM) replace in embodiment 1 double-peak high-density polytene A1.The performance measurement of the polyethylene composition of gained the results are shown in Table 1.
Comparative example 2
Adopt the method for embodiment 1 to prepare polyethylene composition, difference is, employing density is 0.962g/cm
3double-peak high-density polytene D2 replace in embodiment 1 double-peak high-density polytene A1.The performance measurement of the polyethylene composition of gained the results are shown in Table 1.
Embodiment 2
The present embodiment is for illustration of polyethylene composition provided by the invention.
The density of 95 weight parts is 0.950g/cm
3, molecular vibrational temperature index is 15, and weight-average molecular weight is the double-peak high-density polytene A2(oil of SPC company of 200000, and the trade mark is YGH041), the density of 5 weight parts is 0.930g/cm
3, melt flow rate (MFR) is (2.16kg) 1g/10min, molecular weight distributing index (MWD) is 4, weight-average molecular weight (Mw) is the ethene of 150000 and the linear low density polyethylene B2(Tianjin Petrochemical Company of 1-hervene copolymer, the trade mark is DFDA7094), four [β-(3 of 0.2 weight part, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, two (2 of 0.2 weight part, 4-di-tert-butyl-phenyl) pentaerythritol diphosphites, poly-succinic (the 4-hydroxyl-2 of 0.4 weight part, 2, 6, 6-tetramethyl--1-piperidine ethanol) ester, 0.05 weight part Pigment Yellow 73 191:1, after mixing in homogenizer, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder melting mixing, extruding pelletization, extrusion temperature is 215 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Embodiment 3
The present embodiment is for illustration of polyethylene composition provided by the invention.
The density of 70 weight parts is 0.954g/cm
3, molecular vibrational temperature index is 25, and weight-average molecular weight is the double-peak high-density polytene A3(Yanshan Petrochemical of 400000,7800M), the density of 30 weight parts is 0.915g/cm
3, melt flow rate (MFR) is (2.16kg) 3g/10min, molecular weight distributing index (MWD) is 4, weight-average molecular weight (Mw) is the ethene of 100000 and the linear low density polyethylene B3(Qilu Petrochemical of 1-butylene copolymerization, trade mark DFDA-7029), 2 of 0.08 weight part, 2'-thiobis (3-(3, 5-di-tert-butyl-hydroxy phenyl) ethyl propionate), poly-succinic (the 4-hydroxyl-2 of 0.08 weight part, 2, 6, 6-tetramethyl--1-piperidine ethanol) ester, after mixing in homogenizer, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder melting mixing, extruding pelletization, extrusion temperature is 220 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Embodiment 4
The present embodiment is for illustration of polyethylene composition provided by the invention.
The density of 90 weight parts is 0.950g/cm
3, molecular vibrational temperature index is 20, and weight-average molecular weight is the double-peak high-density polytene A4(Yanshan Petrochemical of 600000,9050) and, the density of 10 weight parts is 0.920g/cm
3, melt flow rate (MFR) is (2.16kg) 2g/10min, molecular weight distributing index (MWD) is 4, weight-average molecular weight (Mw) is the ethene of 120000 and the linear low density polyethylene B4(Plant of Tianjin Petrochemical Company of 1-hervene copolymer, 9020), 1 of 0.8 weight part, 3, 5-trimethylammonium-2, 4, 6-tri-(3, 5-di-t-butyl-4-hydroxyphenylmethyl) benzene, poly-succinic (the 4-hydroxyl-2 of 0.2 weight part, 2, 6, 6-tetramethyl--1-piperidine ethanol) ester, after mixing in homogenizer, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder melting mixing, extruding pelletization, extrusion temperature is 210 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Embodiment 5
The present embodiment is for illustration of polyethylene composition provided by the invention.
The density 0.952g/cm of 80 weight parts
3, molecular vibrational temperature index is 20, and weight-average molecular weight is the double-peak high-density polytene A5(Borealis of 250000,3495LS), the density of 20 weight parts is 0.920g/cm
3, melt flow rate (MFR) is (2.16kg) 5g/10min, molecular weight distributing index (MWD) is 4, weight-average molecular weight (Mw) is the ethene of 50000 and the linear low density polyethylene B5(Hyundai of 1-hervene copolymer, ST518), the oxidation inhibitor 2 of 0.6 weight part, 2'-thiobis (3-(3, 5-di-tert-butyl-hydroxy phenyl) ethyl propionate), photostabilizer poly-succinic (the 4-hydroxyl-2 of 0.2 weight part, 2, 6, 6-tetramethyl--1-piperidine ethanol) ester, the Pigment red 254 of 0.15 weight part, after mixing in homogenizer, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder melting mixing, extruding pelletization, extrusion temperature is 220 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Embodiment 6
The present embodiment is for illustration of polyethylene composition provided by the invention.
The density of 80 weight parts is 0.952g/cm
3, molecular vibrational temperature index is 20, and weight-average molecular weight is the double-peak high-density polytene A6(Borealis of 250000,3495LS), the density of 20 weight parts is 0.939g/cm
3, melt flow rate (MFR) is (2.16kg) 2g/10min, molecular weight distributing index (MWD) is 3, weight-average molecular weight (Mw) is the ethene of 100000 and the linear low density polyethylene B6(Daqing petrochemical of 1-hervene copolymer, DNDC-7150), oxidation inhibitor four (β-(3 of 0.3 weight part, 5-di-tert-butyl-hydroxy phenyl) propionic acid) pentaerythritol ester, the oxidation inhibitor three (2 of 0.3 weight part, 4-di-t-butyl) phenyl-phosphite, the oxidation inhibitor 2 of 0.1 weight part, 2'-thiobis (3-(3, 5-di-tert-butyl-hydroxy phenyl) ethyl propionate), the poly-[[6-[(1 of photostabilizer of 0.2 weight part, 1, 3, 3-tetramethyl butyl) amine]-1, 3, 5-triazine-2, 4-bis-base] [(2, 2, 6, 6-tetramethyl--4-piperidines) imines]-1, 6-bis-dihexyl [(2, 2, 6, 6-tetramethyl--4-piperidines) imines]]] (photostabilizer 944), after mixing in homogenizer, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder melting mixing, extruding pelletization, extrusion temperature is 220 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Embodiment 7
The present embodiment is for illustration of polyethylene composition provided by the invention.
Be 0.955g/cm by the density of 65 weight parts
3, molecular vibrational temperature index is 20, and weight-average molecular weight is the double-peak high-density polytene A7(swallowization of 200000,6100M), the density of 35 weight parts is 0.920g/cm
3, melt flow rate (MFR) is (2.16kg) 2g/10min, molecular weight distributing index (MWD) is 4, weight-average molecular weight (Mw) is ethene and the 1-hervene copolymer linear low density polyethylene B7(Plant of Tianjin Petrochemical Company of 120000, 9020), oxidation inhibitor four (β-(3 of 0.2 weight part, 5-di-tert-butyl-hydroxy phenyl) propionic acid) pentaerythritol ester, the oxidation inhibitor three (2 of 0.2 weight part, 4-di-t-butyl) phenyl-phosphite, the poly-[[6-[(1 of 0.4 weight part, 1, 3, 3-tetramethyl butyl) amine]-1, 3, 5-triazine-2, 4-bis-base] [(2, 2, 6, 6-tetramethyl--4-piperidines) imines]-1, 6-bis-dihexyl [(2, 2, 6, 6-tetramethyl--4-piperidines) imines]]] (photostabilizer 944) 0.08 weight part pigment Blue 15: 3, after mixing in homogenizer, the rotating speed of high-speed stirring is 1191rpm, through twin screw extruder melting mixing, extruding pelletization, extrusion temperature is 215 DEG C, screw speed is 220rpm.Measure the performance of the polyethylene composition of gained, measurement result is in table 1.
Table 1
As can be seen from the result of table 1, polyethylene composition provided by the invention has the heatproof air aging performance of the environmental stress cracking resistance significantly improved, excellent physical and mechanical properties, low-temperature impact-resistant performance and excellence, good light stability.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (8)
1. a polyethylene composition, said composition contains double-peak high-density polytene and linear low density polyethylene, it is characterized in that, the density of described double-peak high-density polytene is 0.950-0.960g/cm
3, weight-average molecular weight is 200000-600000, and molecular weight distributing index is 15-50; The density of described linear low density polyethylene is 0.915-0.940g/cm
3, described linear low density polyethylene is 0.5-5g/10min according to the melt mass flow rate that GB/T3682-2000 measures; Relative to the described double-peak high-density polytene of 100 weight parts, the content of described linear low density polyethylene is 5-55 weight part.
2. composition according to claim 1, wherein, the density of described double-peak high-density polytene is 0.950-0.954g/cm
3, weight-average molecular weight is 200000-500000, and molecular weight distributing index is 15-30; The density of described linear low density polyethylene is 0.915-0.930g/cm
3, described linear low density polyethylene is 1-3g/10min according to the melt mass flow rate that GB/T3682-2000 measures, and relative to the described double-peak high-density polytene of 100 weight parts, the content of described linear low density polyethylene is 5-50 weight part.
3. composition according to claim 1 and 2, wherein, the weight-average molecular weight of described linear low density polyethylene is 50000-300000, and molecular weight distributing index is 2-10.
4. composition according to claim 1 and 2, wherein, also containing oxidation inhibitor, photostabilizer and pigment in described composition.
5. composition according to claim 4, wherein, relative to the described double-peak high-density polytene of 100 weight parts, the content of described oxidation inhibitor is 0.01-2 weight part, the content of described photostabilizer is 0.01-2 weight part, and the content of described pigment is 0.001-5 weight part.
6. composition according to claim 5, wherein, relative to the described double-peak high-density polytene of 100 weight parts, the content of described oxidation inhibitor is 0.05-1 weight part, the content of described photostabilizer is 0.05-1 weight part, and the content of described pigment is 0.01-1 weight part.
7. the composition according to claim 5 or 6, wherein, described oxidation inhibitor is Hinered phenols and/or phosphite ester kind antioxidant; Be preferably four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, 2,2 '-thiobis [3-(3,5-di-tert-butyl-hydroxy phenyl) ethyl propionate], 1,3,5-trimethylammonium-2,4,6-tri-(3,5-di-t-butyl-4-hydroxyphenylmethyl) benzene, three (2,4-di-tert-butyl-phenyl) one or more in phosphorous acid ester and two (2,4-di-tert-butyl-phenyl) pentaerythritol diphosphites.
8. the composition according to claim 5 or 6, wherein, described photostabilizer is hindered amine light stabilizer, is preferably poly-succinic (4-hydroxyl-2,2,6,6-tetramethyl--1-piperidine ethanol) ester and/or poly-[[6-[(1,1,3,3-tetramethyl butyl) amine]-1,3,5-triazine-2,4-bis-base] [(2,2,6,6-tetramethyl--4-piperidines) imines]-1,6-bis-dihexyl [(2,2,6,6-tetramethyl--4-piperidines) imines]]].
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