CN114426725A - Linear low-density polyethylene composition and preparation method thereof - Google Patents
Linear low-density polyethylene composition and preparation method thereof Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 102
- 229920000092 linear low density polyethylene Polymers 0.000 title claims abstract description 54
- 239000004707 linear low-density polyethylene Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 41
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 41
- 239000002216 antistatic agent Substances 0.000 claims abstract description 31
- 239000004698 Polyethylene Substances 0.000 claims abstract description 24
- -1 polyethylene Polymers 0.000 claims abstract description 24
- 229920000573 polyethylene Polymers 0.000 claims abstract description 22
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims description 14
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical group CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 11
- 235000013539 calcium stearate Nutrition 0.000 claims description 11
- 239000008116 calcium stearate Substances 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- MWEZYKWGRQWLKM-UHFFFAOYSA-N n,n-dihydroxyicosan-3-amine Chemical group CCCCCCCCCCCCCCCCCC(CC)N(O)O MWEZYKWGRQWLKM-UHFFFAOYSA-N 0.000 claims description 2
- 238000005453 pelletization Methods 0.000 claims 1
- 238000001125 extrusion Methods 0.000 abstract description 23
- 239000011347 resin Substances 0.000 abstract description 14
- 229920005989 resin Polymers 0.000 abstract description 14
- 238000004383 yellowing Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 description 20
- 230000006698 induction Effects 0.000 description 13
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 12
- 238000007599 discharging Methods 0.000 description 11
- 230000001590 oxidative effect Effects 0.000 description 11
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 3
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 239000003017 thermal stabilizer Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
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Abstract
The present invention relates to a linear low density polyethylene composition and a method for preparing the same. The polyethylene composition comprises the following components: polyethylene, a main antioxidant, an auxiliary antioxidant, a heat stabilizer and an antistatic agent; preferably, the composition comprises the following components in parts by mass: 100 parts of polyethylene; 0.03-0.06 part of a main antioxidant; 0.06-0.12 part of auxiliary antioxidant; 0.05-0.1 part of heat stabilizer; 0.04-0.06% of antistatic agent. The linear low-density polyethylene composition can obviously improve the graying phenomenon of LLDPE resin under high-temperature processing, obviously reduce the yellow index and improve the appearance performance of resin products. And the linear low-density polyethylene composition has small yellowing amplitude in the multiple extrusion processes, and does not influence the appearance of the product after multiple recovery processing, thereby improving the recovery utilization rate of LLDPE resin.
Description
Technical Field
The invention belongs to the field of high-temperature processing of polyethylene plastics, and particularly relates to a linear low-density polyethylene composition and a preparation method thereof.
Background
Linear Low Density Polyethylene (LLDPE), structurally different from ordinary Low Density Polyethylene (LDPE), is free of long chain branches and is produced by the copolymerization of ethylene and higher alpha olefins such as butene, hexene or octene. The LLDPE polymers produced by copolymerization have a narrower molecular weight distribution than typical LDPE's, while having a linear structure that gives them different rheological characteristics. Excellent penetration resistance, impact resistance, tear resistance and environmental stress cracking resistance, and can be applied to the industries of film extrusion, pipe extrusion, plate extrusion and the like.
In general, the melt index is 2g/10min and the density is 920kg/m3The extrusion processing temperature of the 1-butene copolymerized LLDPE resin is 190-210 ℃. But LLDPE with lower melt index and higher density is provided, and because of the lower shearing sensitivity of LLDPE, common composite auxiliary agent CD-9 is added, the temperature of an extruder barrel can reach 250-260 ℃ during normal extrusion, resin particles are gray in color under the irradiation of a fluorescent lamp, the detected yellow index is higher than before, the appearance of the resin product is unqualified, and the product delivery is influenced. After long-term use and multiple processing, the phenomena of graying and yellowing are more obvious, and the reutilization of PE is influenced.
The compound additive CD-9 is difficult to solve the problems of gray color and high yellow index of LLDPE resin during high-temperature extrusion.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a linear low-density polyethylene composition, which improves the yellow index and the graying phenomenon of LLDPE resin during high-temperature (250-260 ℃) processing and improves the appearance performance of the resin.
To this end, the first aspect of the present invention provides a linear low density polyethylene composition comprising the following components: polyethylene, a main antioxidant, an auxiliary antioxidant, a heat stabilizer and an antistatic agent;
Preferably, the composition comprises the following components in parts by mass:
in some embodiments of the present invention, the mass portion of the thermal stabilizer may be 0.05 parts, 0.06 parts, 0.07 parts, 0.075 parts, 0.08 parts, 0.09 parts, 0.1 parts, or the like. In some preferred embodiments of the present invention, the mass part of the thermal stabilizer is 0.075 to 0.1 part.
In some embodiments of the invention, the polyethylene is a titanium-based catalyst produced Linear Low Density Polyethylene (LLDPE).
In some preferred embodiments of the present invention, the linear low density polyethylene has a melt index of 0.6 to 2.2g/10min and a density of 918 to 927kg/m3. In some embodiments of the invention, the linear low density polyethylene has a melt index of 1.8 to 2.2g/10min and a density of 918 to 920kg/m3. In other embodiments of the present invention, the linear low density polyethylene has a melt index of 0.6 to 1.0g/10min and a density of 923 to 927kg/m3. In the present invention, the melt index is measured under the conditions of a temperature of 190 ℃ and a load of 2.16 Kg.
In some embodiments of the invention, the primary antioxidant is n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxy-phenyl) acrylate (trade name: antioxidant 1076).
In other embodiments of the present invention, the secondary antioxidant is tris [ 2.4-di-tert-butylphenyl ] phosphite (trade name: antioxidant 168).
In some embodiments of the invention, the thermal stabilizer is calcium stearate. In the invention, the calcium stearate not only can be used as a heat stabilizer, but also can be used as a titanium catalystCl of PE product generated by catalyst-The absorbent of (1). Therefore, the problems of color yellowing and graying of the polyethylene product under high-temperature (250-260 ℃) processing can be obviously improved by utilizing the synergistic effect of the calcium stearate as the heat stabilizer and the antioxidant.
In other embodiments of the present invention, the antistatic agent is N, N-dihydroxyethyl octadecylamine (trade name: antistatic agent 1800).
In a second aspect of the present invention, there is provided a process for producing a polyethylene composition according to the first aspect of the present invention, comprising the steps of:
s1, mixing the polyethylene powder, the main antioxidant, the auxiliary antioxidant, the heat stabilizer and the antistatic agent to obtain a mixture;
s2, adding the mixture into an extruder, and extruding at high temperature; and then cooled, pelletized and dried to obtain the linear low density polyethylene composition (LLDPE pellets).
In some embodiments of the present invention, the polyethylene powder, the primary antioxidant, the secondary antioxidant, the heat stabilizer and the antistatic agent are blended or stirred uniformly in a high-speed mixer to obtain a mixture.
In some embodiments of the invention, the extruder is rotated at a speed of 160r/min to 200 r/min.
The method for preparing the polyethylene composition of the invention relates to a high temperature extrusion process. In some embodiments of the invention, the temperatures of the extruder from the feeding port to seven temperature control areas of the head are respectively 150-160 ℃, 240-250 ℃, 250-260 ℃ and 250-260 ℃.
In some embodiments of the invention, the extruder is a twin screw extruder.
The linear low density polyethylene composition (LLDPE pellets) obtained by the experiment was repeatedly extruded for a plurality of times, and the yellowing degree of the polyethylene composition at the plurality of times of processing was observed.
The invention has the beneficial effects that: the linear low-density polyethylene composition can obviously improve the graying phenomenon of LLDPE resin under high-temperature processing, obviously reduce the yellow index and improve the appearance performance of resin products. And the linear low-density polyethylene composition has small yellowing amplitude in the multiple extrusion processes, and does not influence the appearance of the product after multiple recovery processing, thereby improving the recovery utilization rate of LLDPE resin.
Drawings
FIG. 1 is a schematic illustration of seven temperature control zones of an extruder including a head temperature control utilized in the present invention; one of the zones is a feed zone.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description will proceed with reference being made to examples, which are intended to be illustrative only and are not intended to limit the scope of the invention. The starting materials or components used in the present invention may be commercially or conventionally prepared unless otherwise specified.
In the examples described below, the yellow index in the composition is determined with reference to standard HG/T3862-2006 and the oxidation induction phase in the composition is determined with reference to standard GB/T19466.6-2009.
Example 1
0.03 mass part of main antioxidant (antioxidant 1076), 0.06 mass part of auxiliary antioxidant (antioxidant 168), 0.05 mass part of calcium stearate, 0.05 mass part of antistatic agent (antistatic agent 1800) and 100 mass parts of LLDPE powder (melt index 1.8-2.2 g/10min, density 918-922 kg/m)3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the set temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 240 ℃, 250 ℃ and drying to obtain a linear low-density polyethylene composition, and continuously extruding the composition for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 2
0.03 part by mass of a main antioxidant (antioxidant 1076) and 0.06 part by mass of a antioxidantAuxiliary antioxidant (antioxidant 168), 0.075 part by mass of calcium stearate, 0.05 part by mass of antistatic agent (antistatic agent 1800) and 100 parts by mass of LLDPE powder (melt index 1.8-2.2 g/10min, density 918-922 kg/m3) Adding into a high-speed stirrer, stirring for 5min, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the set temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 240 ℃, 250 ℃ and drying to obtain a linear low-density polyethylene composition, and continuously extruding the composition for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 3
0.03 mass part of main antioxidant (antioxidant 1076), 0.06 mass part of auxiliary antioxidant (antioxidant 168), 0.10 mass part of calcium stearate, 0.05 mass part of antistatic agent (antistatic agent 1800) and 100 mass parts of LLDPE powder (melt index 1.8-2.2 g/10min, density 918-922 kg/m)3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the set temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 240 ℃, 250 ℃ and drying to obtain a linear low-density polyethylene composition, and continuously extruding the composition for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 4
0.03 part by mass of a main antioxidant (antioxidant 1076), 0.06 part by mass of an auxiliary antioxidant (auxiliary antioxidant 168), 0.05 part by mass of calcium stearate, 0.05 part by mass of an antistatic agent (antistatic agent 1800) and 100 parts by mass of LLDPE powder (melt index 0.6-1.0 g/10min, density 923-927 kg/m3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating in a double-screw extruder, wherein the temperature of the extruder is set in seven temperature control areas from a feeding port to a machine headRespectively 150 ℃, 250 ℃, 260 ℃, cooling, granulating and drying to obtain the linear low-density polyethylene composition, and continuously extruding the composition for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 5
0.03 mass part of main antioxidant (antioxidant 1076), 0.06 mass part of auxiliary antioxidant (antioxidant 168), 0.075 mass part of calcium stearate, 0.05 mass part of antistatic agent (antistatic agent 1800) and 100 mass parts of LLDPE powder (the melt index is 0.6-1.0 g/10min, and the density is 923-927 kg/m3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 250 ℃, 260 ℃ and 260 ℃, cooling, granulating and drying are carried out to obtain the linear low-density polyethylene composition, and the composition is continuously extruded for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 6
0.03 mass part of main antioxidant (antioxidant 1076), 0.06 mass part of auxiliary antioxidant (antioxidant 168), 0.1 mass part of calcium stearate, 0.05 mass part of antistatic agent (antistatic agent 1800) and 100 mass parts of LLDPE powder (melt index 0.6-1.0 g/10min, density 923-927 kg/m3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 250 ℃, 260 ℃ and 260 ℃, cooling, granulating and drying are carried out to obtain the linear low-density polyethylene composition, and the composition is continuously extruded for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 7
0.03 part by mass of main antioxidantAn antioxidant 1076, 0.06 part by mass of an auxiliary antioxidant 168, 0.05 part by mass of zinc stearate, 0.05 part by mass of an antistatic agent 1800 and 100 parts by mass of LLDPE powder (melt index 1.8-2.2 g/10min, density 918-922 kg/m)3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the set temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 190 ℃, 200 ℃ and 200 ℃, cooling, granulating and drying are carried out to obtain the linear low-density polyethylene composition, and the composition is continuously extruded for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 8
0.03 part by mass of a main antioxidant (antioxidant 1076), 0.06 part by mass of an auxiliary antioxidant (antioxidant 168), 0.05 part by mass of zinc stearate, 0.05 part by mass of an antistatic agent (antistatic agent 1800) and 100 parts by mass of LLDPE powder (melt index 1.8-2.2 g/10min, density 918-922 kg/m)3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the set temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 240 ℃, 250 ℃ and drying to obtain a linear low-density polyethylene composition, and continuously extruding the composition for 4 times. The yellowness index and the oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 9
0.03 part by mass of a main antioxidant (antioxidant 1076), 0.12 part by mass of an auxiliary antioxidant (antioxidant 168), 0.05 part by mass of zinc stearate, 0.05 part by mass of an antistatic agent (antistatic agent 1800) and 100 parts by mass of LLDPE powder (the melt index is 1.8-2.2 g/10min, and the density is 918-922 kg/m)3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding the mixture in a double-screw extruder for granulation, and feeding the mixture into the extruder The temperature set in seven temperature control areas from the material port to the machine head is respectively 150 ℃, 240 ℃, 250 ℃, and the linear low-density polyethylene composition is obtained after cooling, granulating and drying, and the composition is continuously extruded for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 10
0.03 part by mass of a main antioxidant (antioxidant 1076), 0.06 part by mass of an auxiliary antioxidant (antioxidant 626), 0.05 part by mass of zinc stearate, 0.05 part by mass of an antistatic agent (antistatic agent 1800) and 100 parts by mass of LLDPE powder (melt index 1.8-2.2 g/10min, density 918-922 kg/m)3) Adding the mixture into a high-speed stirrer, stirring for 5min, uniformly stirring, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the set temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 240 ℃, 250 ℃ and drying to obtain a linear low-density polyethylene composition, and continuously extruding the composition for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Example 11
0.03 part by mass of a main antioxidant (antioxidant 1076), 0.06 part by mass of an auxiliary antioxidant (antioxidant 168), 0.05 part by mass of zinc stearate, 0.05 part by mass of an antistatic agent (antistatic agent 1800) and 100 parts by mass of LLDPE powder (melt index 0.6-1.0 g/10min, density 923-927 kg/m3) Adding into a high-speed stirrer, stirring for 5min, and discharging to obtain a mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the temperatures of seven temperature control areas from a feed inlet to a machine head of the extruder are respectively 150 ℃, 250 ℃, 260 ℃ and 260 ℃, cooling, granulating and drying are carried out to obtain the linear low-density polyethylene composition, and the composition is continuously extruded for 4 times. The yellowness index and oxidative induction period of the composition after each extrusion were determined and the results are shown in tables 1 and 2, respectively.
Table 1: yellowness index of the composition after each extrusion
TABLE 2 Oxidation Induction period (min) of the composition after each extrusion
Two titanium-based catalysts of different melt index and density were used in the examples to produce Linear Low Density Polyethylene (LLDPE) resins. As can be seen from the results of the above experimental examples, calcium stearate was used as a heat stabilizer and Cl in LLDPE produced by using a titanium-based catalyst -The absorbent can obviously improve the problems of yellowing and graying of the polyethylene resin under high temperature (250-260 ℃). After multiple times of extrusion processing, the yellow index of the resin is reduced to a small extent, and meanwhile, the antioxidant performance of the composition is relatively stable.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. A linear low density polyethylene composition comprising the following components: polyethylene, a main antioxidant, an auxiliary antioxidant, a heat stabilizer and an antistatic agent;
preferably, the composition comprises the following components in parts by mass:
2. The polyethylene composition according to claim 1, wherein the polyethylene is a linear low density polyethylene produced by a titanium based catalyst.
3. The polyethylene composition according to claim 2, wherein the linear low density polyethylene has a melt index of 0.6 to 2.2g/10min and a density of 918 to 927kg/m3。
4. A polyethylene composition according to any of the claims 1-3, wherein said primary antioxidant is n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxy-phenyl) acrylate.
5. The polyethylene composition according to any of claims 1-4, wherein the secondary antioxidant is tris [ 2.4-di-tert-butylphenyl ] phosphite.
6. The polyethylene composition according to any one of claims 1-5, wherein the heat stabilizer is calcium stearate.
7. A polyethylene composition according to any of claims 1 to 6, wherein said antistatic agent is N, N-dihydroxyethyl octadecylamine.
8. A process for the preparation of a polyethylene composition according to any of claims 1 to 7, comprising the steps of:
s1, mixing the polyethylene powder, the main antioxidant, the auxiliary antioxidant, the heat stabilizer and the antistatic agent to obtain a mixture;
S2, adding the mixture into an extruder, and extruding at high temperature; and then cooling, pelletizing and drying to obtain the linear low-density polyethylene composition.
9. The method according to claim 8, wherein the rotational speed of the extruder is 160r/min to 200 r/min.
10. The method according to claim 8 or 9, wherein the temperatures of the extruder set from the feed port to seven temperature control regions of the head are 150 to 160 ℃, 240 to 250 ℃, 250 to 260 ℃ and 250 to 260 ℃, respectively.
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| CN102585324A (en) * | 2011-01-17 | 2012-07-18 | 中国石油化工股份有限公司 | Polyethylene composition for improving yellow index and lustrousness and preparation method thereof |
| CN106336559A (en) * | 2015-08-10 | 2017-01-18 | 中国石油化工股份有限公司 | Modified high-density polyethylene resin used for large hollow blow molding, and production method of resin |
| CN109575394A (en) * | 2017-09-28 | 2019-04-05 | 中国石化扬子石油化工有限公司 | A kind of tubing polyethylene composition and preparation method thereof that yellow colour index improves |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102585324A (en) * | 2011-01-17 | 2012-07-18 | 中国石油化工股份有限公司 | Polyethylene composition for improving yellow index and lustrousness and preparation method thereof |
| CN106336559A (en) * | 2015-08-10 | 2017-01-18 | 中国石油化工股份有限公司 | Modified high-density polyethylene resin used for large hollow blow molding, and production method of resin |
| CN109575394A (en) * | 2017-09-28 | 2019-04-05 | 中国石化扬子石油化工有限公司 | A kind of tubing polyethylene composition and preparation method thereof that yellow colour index improves |
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