CN109053942B - Preparation method of antioxidant high-density polyethylene resin special for cosmetic bottle - Google Patents
Preparation method of antioxidant high-density polyethylene resin special for cosmetic bottle Download PDFInfo
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- CN109053942B CN109053942B CN201810748780.6A CN201810748780A CN109053942B CN 109053942 B CN109053942 B CN 109053942B CN 201810748780 A CN201810748780 A CN 201810748780A CN 109053942 B CN109053942 B CN 109053942B
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- 229920001903 high density polyethylene Polymers 0.000 title claims abstract description 61
- 239000004700 high-density polyethylene Substances 0.000 title claims abstract description 61
- 239000003963 antioxidant agent Substances 0.000 title claims abstract description 59
- 239000011347 resin Substances 0.000 title claims abstract description 56
- 229920005989 resin Polymers 0.000 title claims abstract description 55
- 239000002537 cosmetic Substances 0.000 title claims abstract description 53
- 230000003078 antioxidant effect Effects 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 103
- 239000007789 gas Substances 0.000 claims abstract description 80
- 240000007817 Olea europaea Species 0.000 claims abstract description 75
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000000284 extract Substances 0.000 claims abstract description 75
- 239000003054 catalyst Substances 0.000 claims abstract description 58
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000005977 Ethylene Substances 0.000 claims abstract description 55
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000001257 hydrogen Substances 0.000 claims abstract description 29
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 18
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 claims abstract description 9
- 230000000379 polymerizing effect Effects 0.000 claims abstract description 4
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 40
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000007142 ring opening reaction Methods 0.000 claims description 27
- 239000000155 melt Substances 0.000 claims description 23
- 239000002904 solvent Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- STMDPCBYJCIZOD-UHFFFAOYSA-N 2-(2,4-dinitroanilino)-4-methylpentanoic acid Chemical compound CC(C)CC(C(O)=O)NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O STMDPCBYJCIZOD-UHFFFAOYSA-N 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000011572 manganese Substances 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 claims description 9
- 238000001291 vacuum drying Methods 0.000 claims description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 238000002390 rotary evaporation Methods 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 239000011593 sulfur Substances 0.000 claims description 8
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical group Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 claims description 8
- -1 polyethylene Polymers 0.000 abstract description 11
- 239000004698 Polyethylene Substances 0.000 abstract description 10
- 229920000573 polyethylene Polymers 0.000 abstract description 10
- 239000010445 mica Substances 0.000 description 24
- 229910052618 mica group Inorganic materials 0.000 description 24
- 239000000047 product Substances 0.000 description 22
- 239000000243 solution Substances 0.000 description 20
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 12
- 239000002994 raw material Substances 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 7
- 229910010272 inorganic material Inorganic materials 0.000 description 7
- 239000011147 inorganic material Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 6
- 230000032683 aging Effects 0.000 description 6
- 150000002301 glucosamine derivatives Chemical class 0.000 description 6
- MSWZFWKMSRAUBD-IVMDWMLBSA-N 2-amino-2-deoxy-D-glucopyranose Chemical compound N[C@H]1C(O)O[C@H](CO)[C@@H](O)[C@@H]1O MSWZFWKMSRAUBD-IVMDWMLBSA-N 0.000 description 5
- MSWZFWKMSRAUBD-UHFFFAOYSA-N beta-D-galactosamine Natural products NC1C(O)OC(CO)C(O)C1O MSWZFWKMSRAUBD-UHFFFAOYSA-N 0.000 description 5
- 229960002442 glucosamine Drugs 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- CWNOEVURTVLUNV-UHFFFAOYSA-N 2-(propoxymethyl)oxirane Chemical compound CCCOCC1CO1 CWNOEVURTVLUNV-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- NHXWPSYRAGWTFC-UHFFFAOYSA-N dodecyl(diethyl)azanium;chloride Chemical compound Cl.CCCCCCCCCCCCN(CC)CC NHXWPSYRAGWTFC-UHFFFAOYSA-N 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000005956 quaternization reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical group 0.000 description 2
- 239000003242 anti bacterial agent Substances 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- IRMPFYJSHJGOPE-UHFFFAOYSA-N olivetol Chemical compound CCCCCC1=CC(O)=CC(O)=C1 IRMPFYJSHJGOPE-UHFFFAOYSA-N 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 125000001453 quaternary ammonium group Chemical group 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000003385 bacteriostatic effect Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical class [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007760 free radical scavenging Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Cosmetics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention relates to the field of polyethylene preparation, and discloses a preparation method of antioxidant high-density polyethylene resin special for cosmetic bottles, which comprises the following steps: 1) pre-polymerization: adding ethylene gas, hydrogen and a catalyst into a first polymerization kettle containing normal hexane, and carrying out polymerization reaction for 0.5-1.5h at the temperature of 90-95 ℃ and under the pressure of 1.8-2.0 MPa; 2) and (3) repolymerization: the polymerization product enters a second polymerization kettle, 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; polymerizing for 1-2h at 85-90 ℃ and 1.5-1.8 MPa; 3) separation and drying: cooling the polymerization slurry product, and then separating and drying; 4) and (4) mixing and granulating. The antioxidant high-density polyethylene resin special for cosmetic bottles has good antioxidant capacity without an antioxidant additive, and has good processability because the high-density polyethylene resin does not contain the antioxidant additive.
Description
Technical Field
The invention relates to the field of polyethylene preparation, in particular to a preparation method of antioxidant high-density polyethylene resin special for cosmetic bottles.
Background
In recent years, the sales of Chinese cosmetics are increased at a high rate, and High Density Polyethylene (HDPE) bottles used for cosmetic packaging have the characteristics of good hand feeling, moderate hardness, smooth appearance and good printing effect, and replace the traditional polyester bottles and other packaging materials to become the first-choice packaging materials for cosmetics. Because no special resin for cosmetic bottles exists in China, the high-density polyethylene resin for the existing small hollow container cannot singly meet the production requirement of products. Although the high-density polyethylene has a series of advantages, the disadvantages are obvious, and when the high-density polyethylene is in an environment of heat, light, oxygen and the like during processing and using, the resin is easy to oxidize and age. In the prior art, some antioxidant additives, such as phenolic antioxidants, phosphite auxiliary antioxidants, stearates, etc., are usually added to the high density polyethylene resin.
Although the antioxidant additive can effectively improve the oxidation resistance of the high-density polyethylene resin, the antioxidant additive is usually added in the resin melting-molding process after the high-density polyethylene resin is prepared by polymerization, and the antioxidant additive has poor compatibility because the property of the antioxidant additive is greatly different from that of the high-density polyethylene resin, and is easy to dissolve out after a plastic product is prepared, so that the oxidation resistance of the high-density polyethylene plastic product is greatly reduced, and long-term antioxidant aging resistance cannot be realized. And the antioxidant auxiliary agent can be mixed with the contained cosmetics after being dissolved out, thereby having certain influence on the use safety of the cosmetics.
On the other hand, during melt extrusion processing, due to the addition of the antioxidant additive, certain negative effects are also caused on the rheological property of the melt, so that the processability of the plastic melt is deteriorated.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of special antioxidant high-density polyethylene resin for cosmetic bottles, the special antioxidant high-density polyethylene resin for cosmetic bottles has better antioxidant capacity without adding antioxidant additives, and the high-density polyethylene resin has better processability because the high-density polyethylene resin does not contain the antioxidant additives.
The specific technical scheme of the invention is as follows: a preparation method of antioxidant high-density polyethylene resin special for cosmetic bottles comprises the following steps:
1) pre-polymerization: adding ethylene gas, hydrogen and a catalyst into a first polymerization kettle containing an n-hexane solvent, and carrying out polymerization reaction for 0.5-1.5h at 90-95 ℃ and 1.8-2.0 MPa.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; polymerizing for 1-2h at 85-90 ℃ and 1.5-1.8 MPa.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
The invention improves the existing high-density polyethylene polymerization process, and has the following technical effects:
1. after a great deal of research, the team of the invention finds that the high-density polyethylene resin for producing cosmetic bottles has wider requirementsM of (A)w/MnTherefore, the invention adopts a mode of connecting two polymerization kettles in series for industrial production, so that the M of the HDPE resinw/MnThe PET-PET composite material is wider, can improve the shear sensitivity of HDPE solution viscosity in the subsequent product processing process, has lower HDPE solution viscosity and better processability, is easy to extrude, and is easy to form bottle blanks; in the process of parison extrusion and blowing, the melt has higher strength, the vertical extension caused by self weight is reduced, and the bottle parison can be uniformly blown and molded without tearing.
2. In step 2) of the present invention, 1-butene and modified natural olive phenol extract are added as comonomers (which must be added in step 2)). After the prepolymerization in the step 1), polyethylene with a certain length and molecular weight can be obtained, 1-butene and the modified natural olive phenol extract are added into a second polymerization kettle, so that the molecular chain structure of the polyethylene can be optimized, the number of short chain branches on the molecular chain can be controlled, the molecular chains of the polyethylene can be orderly arranged, the density of an HDPE product can be controlled, and the crystallinity of polyethylene resin can be improved.
In addition, the modified natural olive phenol extract is a natural olive phenol extract with modified natural olive phenol extract carrying olefin groups. The natural olive phenol extract is a phenol compound extracted from olive fruits, and has strong antioxidation and free radical scavenging capabilities due to the fact that a plurality of phenolic hydroxyl groups are contained in the molecular structure of the natural olive phenol extract, and the antioxidation effect similar to that of the traditional antioxidant auxiliary agent added externally can be achieved. The modified antioxidant substance has olefin groups, can directly participate in the polymerization reaction of polyethylene (the polymerization temperature is lower, the effect of natural olive phenol extracts cannot be excessively influenced), and compared with the traditional antioxidant auxiliary agent in an additional mode (the defects are detailed in the background technology), the antioxidant substance is a small block on a polyethylene molecular chain, cannot be easily dissolved out of resin due to the compatibility problem, can realize long-term antioxidant, and cannot influence the processability of polyethylene resin. Furthermore, even though the natural olive phenol extract is dissolved out at the later stage, the natural olive phenol extract can be used as a natural antioxidant substance, and can be used as a preservative of cosmetics and the like, the biological safety is good, and no potential safety hazard is brought after the natural olive phenol extract is mixed with the cosmetics.
Preferably, in step 1), the catalyst is a composite catalyst loaded with titanium, manganese and triethylaluminum.
Preferably, in step 1), the molar amounts of ethylene gas and hydrogen are controlled to 1:2.8 to 3.4, and the initial concentration of the catalyst in the first polymerizer is 0.1 to 2% by weight.
Preferably, in the step 2), the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1: 0.18-0.22; the addition amount of 1-butene gas is 0.45-0.55wt% of ethylene gas, and the addition amount of modified natural olive phenol extract is 0.1-0.3wt% of ethylene gas.
The density requirement of the invention on HDPE special for cosmetic bottles is 0.95g/cm3From the above, the present group found that the kind of comonomer, the amount of comonomer added, and the manner of addition are the main factors for controlling the density of the product. For this reason, the present invention does not add 1-butene in the first polymerization vessel during the production process, and strictly controls the addition amount of 1-butene and modified natural olivetol extract in the second polymerization vessel. When the amount of the additive is too large or too small, an ideal density range cannot be obtained. The density of HDPE is 0.959-0.965 g/cm under the addition of the invention3And meets the index.
Preferably, the melt mass flow rate in the first polymerizer is from 10 to 12g/min, and the melt mass flow rate in the second polymerizer is from 0.025 to 0.045 g/min.
After a great deal of research, the team of the invention finds that the control of the melt mass flow rate during the polyethylene polymerization is very critical to the properties of HDPE, such as molecular weight, density and the like. The present inventors have also found that the control of the amount of hydrogen and ethylene fed under a given catalyst concentration is critical to the control of the melt mass flow rate, and for this reason, the present invention strictly controls the feed ratio of hydrogen and ethylene in the prepolymerization and the repolymerization to achieve the melt mass flow rate.
Preferably, the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO is2The content is less than 44.0 mg/kg; of said 1-butene gasThe purity is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg; the purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and CO is2The content is less than or equal to 10.0 mg/kg.
Preferably, in the step 2), the preparation method of the modified natural olive phenol extract comprises the following steps: adding the natural olive phenol extract and a ring-opening catalyst into an ethanol aqueous solution, heating to 75-85 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 60-65 ℃ until the reaction is finished, cooling to normal temperature, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove the ethanol aqueous solution and the allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
Although natural olive phenol extracts have excellent antioxidant properties, they cannot participate in polymerization reactions. Therefore, the molecular structure of the olive phenol extract is modified, the propyl glycidyl ether is grafted to the molecules of the natural olive phenol extract by skillfully utilizing the characteristic that an epoxy group on the propyl glycidyl ether can perform a ring-opening reaction with hydroxyl (a large amount of hydroxyl is contained on the natural olive phenol extract) under a catalyst, and the reaction formula is as follows:
as shown below, the modified natural olive phenol extract has the ability to participate in the polymerization of polyethylene due to the carbon-carbon double bond contained in propyl glycidyl ether.
Preferably, the ring-opening catalyst is a resin on which tin chloride is supported.
Preferably, the mass of the ring-opening catalyst is 1-3% of the modified natural olive phenol extract.
Preferably, the concentration of the ethanol aqueous solution is 60-80wt%, and the concentration of the modified natural olive phenol extract in the ethanol aqueous solution is 5-15 wt%.
Compared with the prior art, the invention has the beneficial effects that: the antioxidant high-density polyethylene resin special for cosmetic bottles has good antioxidant capacity without an antioxidant additive, and has good processability because the high-density polyethylene resin does not contain the antioxidant additive.
Detailed Description
The present invention will be further described with reference to the following examples.
General examples
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the 1-butene gas is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg.
The purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and the content of CO is less than2The content is less than or equal to 10.0 mg/kg.
Preparation of modified natural olive phenolic extract:
adding natural olive phenol extract and ring-opening catalyst (resin loaded with stannic chloride) into 60-80wt% ethanol water solution, wherein the concentration of modified natural olive phenol extract in ethanol water solution is 5-15wt%, and the mass of ring-opening catalyst is 1-3% of modified natural olive phenol extract.
Heating to 75-85 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 60-65 ℃ until the reaction is finished, cooling to normal temperature, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove ethanol aqueous solution and allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) are added into a first polymerization kettle containing an n-hexane solvent, and polymerization is carried out for 0.5 to 1.5 hours at the temperature of between 90 and 95 ℃ and under the pressure of between 1.8 and 2.0 MPa. Wherein the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1:2.8-3.4, the initial concentration of the catalyst in the first polymerization kettle is 0.1-2wt%, and the mass flow rate of a melt in the first polymerization kettle is 10-12 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, and 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; polymerizing for 1-2h at 85-90 ℃ and 1.5-1.8 MPa. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1: 0.18-0.22; the addition amount of 1-butene gas is 0.45-0.55wt% of ethylene gas, the addition amount of modified natural olive phenol extract is 0.1-0.3wt% of ethylene gas, and the melt mass flow rate in the second polymerization kettle is 0.025-0.045 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
Example 1
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the 1-butene gas is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg.
The purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and the content of CO is less than2The content is less than or equal to 10.0 mg/kg.
Preparation of modified natural olive phenolic extract:
adding natural olive phenol extract and ring-opening catalyst (resin loaded with stannic chloride) into 70 wt% ethanol water solution, wherein the concentration of modified natural olive phenol extract in ethanol water solution is 10 t%, and the mass of ring-opening catalyst is 2% of modified natural olive phenol extract.
Heating to 80 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 62 ℃, cooling to normal temperature after the reaction is finished, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove ethanol aqueous solution and allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen gas and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) were added to a first polymerization vessel containing an n-hexane solvent, and a polymerization reaction was carried out at 92 ℃ and 1.9MPa for 1 hour. Wherein the molar amounts of ethylene gas and hydrogen gas were controlled at 1: 3.1, the initial concentration of the catalyst in the first polymerizer was 0.5% by weight, and the melt mass flow rate in the first polymerizer was 11 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, and 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; the mixture was polymerized at 86 ℃ under 1.6MPa for 1.5 h. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled at 1: 0.2; the amount of 1-butene gas added was 0.5 wt% of ethylene gas, the amount of modified natural olive phenol extract added was 0.2 wt% of ethylene gas, and the melt mass flow rate in the second polymerization vessel was 0.035 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
Example 2
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the 1-butene gas is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg.
The purity of the hydrogen is more than or equal to 95 percentCO content less than 45.0mg/kg, CO2The content is less than or equal to 10.0 mg/kg.
Preparation of modified natural olive phenolic extract:
adding natural olive phenol extract and ring-opening catalyst (resin loaded with stannic chloride) into 65 wt% ethanol water solution, wherein the concentration of modified natural olive phenol extract in ethanol water solution is 8 wt%, and the mass of ring-opening catalyst is 1.5% of modified natural olive phenol extract.
Heating to 82 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 64 ℃, cooling to normal temperature after the reaction is finished, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove ethanol aqueous solution and allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) were added to a first polymerization vessel containing an n-hexane solvent, and a polymerization reaction was carried out at 94 ℃ and 2MPa for 1 hour. Wherein the molar amounts of ethylene gas and hydrogen are controlled at 1: 3, the initial concentration of the catalyst in the first polymerizer is 0.2 wt%, and the melt mass flow rate in the first polymerizer is 12 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, and 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; the mixture was polymerized at 88 ℃ under 1.7MPa for a further 2 h. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1: 0.19; the addition amount of 1-butene gas was 0.48 wt% to ethylene gas, the addition amount of modified natural olive phenol extract was 0.15 wt% to ethylene gas, and the melt mass flow rate in the second polymerization vessel was 0.03 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
Example 3
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the 1-butene gas is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg.
The purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and the content of CO is less than2The content is less than or equal to 10.0 mg/kg.
Preparation of modified natural olive phenolic extract:
adding natural olive phenol extract and ring-opening catalyst (resin loaded with stannic chloride) into 60 wt% ethanol water solution, wherein the concentration of modified natural olive phenol extract in ethanol water solution is 5wt%, and the mass of ring-opening catalyst is 1% of modified natural olive phenol extract.
Heating to 75 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 60 ℃, cooling to normal temperature after the reaction is finished, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove ethanol aqueous solution and allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen gas and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) were added to a first polymerization vessel containing an n-hexane solvent, and a polymerization reaction was carried out at 90 ℃ and 1.8MPa for 1.5 hours. Wherein the molar amounts of ethylene gas and hydrogen gas were controlled at 1:2.8, the initial concentration of the catalyst in the first polymerizer was 0.1% by weight, and the melt mass flow rate in the first polymerizer was 10 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, and 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; the mixture was polymerized at 85 ℃ under 1.5MPa for a further 1 h. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1: 0.18; the amount of 1-butene gas added was 0.45 wt% to ethylene gas, the amount of modified natural olive phenol extract added was 0.1 wt% to ethylene gas, and the melt mass flow rate in the second polymerization vessel was 0.025 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
Example 4
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the 1-butene gas is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg.
The purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and the content of CO is less than2The content is less than or equal to 10.0 mg/kg.
Preparation of modified natural olive phenolic extract:
adding natural olive phenol extract and ring-opening catalyst (resin loaded with stannic chloride) into 80wt% ethanol water solution, wherein the concentration of modified natural olive phenol extract in ethanol water solution is 15wt%, and the mass of ring-opening catalyst is 1-3% of modified natural olive phenol extract.
Heating to 85 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 65 ℃, cooling to normal temperature after the reaction is finished, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove ethanol aqueous solution and allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen gas and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) were added to a first polymerization vessel containing an n-hexane solvent, and a polymerization reaction was carried out at 95 ℃ and 2.0MPa for 1.5 hours. Wherein the molar quantity of the ethylene gas and the hydrogen gas is controlled at 1: 3.4, the initial concentration of the catalyst in the first polymerization kettle is 0.1-2wt%, and the melt mass flow rate in the first polymerization kettle is 12 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, and 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; the polymerization was carried out at 90 ℃ and 1.8MPa for a further 1 h. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1: 0.22; the addition amount of 1-butene gas was 0.55wt% of ethylene gas, the addition amount of modified natural olive phenol extract was 0.3wt% of ethylene gas, and the melt mass flow rate in the second polymerization vessel was 0.045 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
Example 5
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the 1-butene gas is more than or equal to 97 percent, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg.
The purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and the content of CO is less than2The content is less than or equal to 10.0 mg/kg.
Preparation of modified natural olive phenolic extract:
adding natural olive phenol extract and ring-opening catalyst (resin loaded with stannic chloride) into 70 wt% ethanol water solution, wherein the concentration of modified natural olive phenol extract in ethanol water solution is 10 t%, and the mass of ring-opening catalyst is 2% of modified natural olive phenol extract.
Heating to 80 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 62 ℃, cooling to normal temperature after the reaction is finished, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove ethanol aqueous solution and allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
Preparing modified mica sheet powder: preparing 35 wt% of epoxypropyl dodecyl diethyl ammonium chloride into a water solution A, preparing 15wt% of glucosamine into a water solution B, placing the water solution A in a water bath at 45 ℃, dropwise adding the water solution B into the water solution A at a dropwise adding speed of 8mL/min under a stirring condition for reaction, wherein the mass ratio of glucosamine to epoxypropyl dodecyl diethyl ammonium chloride is 1:2, carrying out heat preservation reaction for 3 hours after dropwise adding, adding acetone into the obtained concentrate after reduced pressure distillation, and carrying out precipitation, filtration, cleaning and vacuum drying to obtain quaternized modified glucosamine for later use; calcining mica flake powder (400 ℃, 4 hours), preparing a suspension with the concentration of 6 wt% by using water, heating to 48 ℃, adding quaternized modified glucosamine with the mass of 0.3 time of that of the mica flake into the suspension, stirring for reacting for 8 hours, and obtaining the nano-scale modified mica flake powder after centrifugation, filtration, ball milling and drying.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen gas and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) were added to a first polymerization vessel containing an n-hexane solvent, and a polymerization reaction was carried out at 92 ℃ and 1.9MPa for 1 hour. Wherein the molar amounts of ethylene gas and hydrogen gas were controlled at 1: 3.1, the initial concentration of the catalyst in the first polymerizer was 0.5% by weight, and the melt mass flow rate in the first polymerizer was 11 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, 1-butylene gas and hydrogen are introduced, and modified natural olive phenol extracts and modified mica flake powder are added; the mixture was polymerized at 86 ℃ under 1.6MPa for 1.5 h. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled at 1: 0.2; the addition amount of 1-butene gas was 0.5 wt% of ethylene gas, the addition amount of modified natural olive phenol extract was 0.2 wt% of ethylene gas, the addition amount of modified mica flake powder was 1 wt% of the final product, and the melt mass flow rate in the second polymerization kettle was 0.035 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
In this embodiment, modified mica flake powder is additionally added in step 3) as a modifier, the mica flake is a lamellar material, and the mica flake is compounded in plastic to play a role in blocking gas, water and light, so that after the mica flake is processed into a cosmetic bottle, the airtightness of the cosmetic bottle can be ensured, and the mica flake is an inorganic material and has excellent aging resistance. In the prior art, inorganic materials are usually added during plastic extrusion, but the compatibility of the inorganic materials and the plastic is poor. The inorganic material is added in the HDPE polymerization process, so that the technical effects of greatly prolonging the compatible time of the inorganic material and the HDPE, ensuring that the inorganic material and the HDPE have better compatibility in the subsequent extrusion molding process after a period of compatibility, and ensuring that the inorganic material has smaller influence on the rheological property of a plastic melt.
However, if the mica sheets are added directly, the mica sheets are easily agglomerated in an organism system due to the influence of polar factors, and the dispersion is poor because the inter-lamellar spacing is too small. Therefore, the invention carries out a series of modification treatments on the mica sheet: firstly, the glucosamine is subjected to quaternization modification by utilizing the epoxypropyl dodecyl diethyl ammonium chloride, the glucosamine has the capability of entering between agglomerated mica sheets due to the quaternary ammonium functional groups, and after the quaternization modified glucosamine enters between the mica sheets, the sheet spacing of the mica sheets is enlarged, so that the glucosamine is not easy to agglomerate. Furthermore, the quaternized modified glucosamine contains a large amount of hydroxyl groups, and can be combined with the hydroxyl groups on the mica sheets to generate hydrogen bonds, so that the stability is improved, the quaternized modified glucosamine is not easy to escape from the mica sheet layers, and the secondary agglomeration of the mica sheets after a long time is prevented. Therefore, the mica sheets treated by the method are not easy to agglomerate in a polyethylene system and have better dispersibility. On the other hand, the quaternary ammonium functional group has a bacteriostatic action, so the mica powder modified by quaternization also has an antibacterial effect, and the addition amount of the self antibacterial agent in a cosmetic formula can be reduced (the safety of the antibacterial agent is questioned generally) after the mica powder is used as a cosmetic bottle.
In addition, although the mica sheet contains a large amount of hydroxyl groups, the activity is not high in a normal state, and therefore, the present invention is to perform a calcination treatment to sufficiently expose the hydroxyl groups and to increase the activity, thereby increasing the degree of binding to the quaternized modified glucosamine.
Comparative example 1
Raw materials:
the purity of the ethylene gas is more than or equal to 99 percent, the content of CO is less than 43.0mg/kg, and CO2The content is less than 44.0 mg/kg.
The purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and the content of CO is less than2The content is less than or equal to 10.0 mg/kg.
The preparation method of the antioxidant high-density polyethylene resin special for the cosmetic bottle comprises the following steps:
1) pre-polymerization: ethylene gas, hydrogen gas and a catalyst (a composite catalyst loaded with titanium, manganese and triethyl aluminum) were added to a first polymerization vessel containing an n-hexane solvent, and a polymerization reaction was carried out at 92 ℃ and 1.9MPa for 1 hour. Wherein the molar amounts of ethylene gas and hydrogen gas were controlled at 1: 3.1, the initial concentration of the catalyst in the first polymerizer was 0.5% by weight, and the melt mass flow rate in the first polymerizer was 11 g/min.
2) And (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, and hydrogen is introduced; the mixture was polymerized at 86 ℃ under 1.6MPa for 1.5 h. Wherein, the molar quantity of the ethylene gas and the hydrogen gas is controlled at 1: 0.2; the melt mass flow rate in the second polymerizer was 0.035 g/min.
3) Separation and drying: and introducing the polymerization slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder particles from a solvent and drying.
4) Mixing and granulating: adding natural olive phenol extracts (the addition amount is the same as that in example 1) into the dried materials, and mixing and granulating in an extruder to obtain the special antioxidant high-density polyethylene resin for cosmetic bottles.
Performance detection
Firstly, oxidation induction period test: according to GB/T19466.6-2009. Uniformly slicing the raw materials, weighing 5-10 mg, putting into an aluminum crucible, and putting into a sample rack. The gas purge gas flow rates were all (50. + -. 5) mL/min. The instrument was calibrated in advance and nitrogen was introduced for 5min before the temperature was raised. The sample was programmed from room temperature to 200 ℃ at a rate of 20 ℃/min in a nitrogen atmosphere, and after the temperature had risen to the experimental set temperature, the programming was stopped and the sample was held constant at that temperature for 5 min. After the constant time is over, the program automatically switches nitrogen to oxygen, which is the zero point of the experiment. The incubation was continued until at least 2min after the onset of a significant change in exotherm and the experiment was terminated. The intersection point determined by the tangent method was used as the oxidation induction time.
Wherein the cosmetic bottle sample is a new sample obtained by processing HPDE into a cosmetic bottle; the aging sample of the cosmetic bottle is a sample which is obtained by adding HDPE into the cosmetic bottle and then accelerating aging for 6 months in an air heat aging test box at a high temperature of 90 ℃.
From the above data, it is known that partial oxidation occurs after HPDE is processed into cosmetic bottles due to the inevitable exclusion of oxygen during processing. As can be seen by comparison, the conventional commercially available HDPE is most oxidized after being made into cosmetic bottles, while the oxidation degree of the comparative example 1 with the addition of the antioxidant aid and the oxidation degree of the examples 1-2 are slightly better, but after the aging test, the oxidation induction time of the antioxidant aid in the comparative example 1 is reduced sharply due to easy dissolution, and the oxidation rate of the examples 1-2 is obviously lower.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (8)
1. A preparation method of antioxidant high-density polyethylene resin special for cosmetic bottles is characterized by comprising the following steps:
1) pre-polymerization: adding ethylene gas, hydrogen and a catalyst into a first polymerization kettle containing a normal hexane solvent, and carrying out polymerization reaction for 0.5-1.5h at 90-95 ℃ and 1.8-2.0 MPa; controlling the molar quantity of ethylene gas and hydrogen gas at 1:2.8-3.4, and controlling the initial concentration of catalyst in the first polymerization kettle at 0.1-2 wt%;
2) and (3) repolymerization: the polymerization product from the first polymerization kettle enters a second polymerization kettle, 1-butylene gas, hydrogen and modified natural olive phenol extracts are introduced; polymerizing for 1-2h at 85-90 ℃ and 1.5-1.8 MPa; the molar quantity of the ethylene gas and the hydrogen gas is controlled to be 1: 0.18-0.22; the addition amount of 1-butene gas is 0.45-0.55wt% of ethylene gas, and the addition amount of modified natural olive phenol extract is 0.1-0.3wt% of ethylene gas;
3) separation and drying: introducing the polymerized slurry product obtained by polymerization into a flash tank for cooling, and then introducing into a separator for separating polymer powder from a solvent and drying;
4) mixing and granulating: and (3) mixing and granulating the dried material in an extruder to obtain the antioxidant high-density polyethylene resin special for cosmetic bottles.
2. The method for preparing the antioxidant high-density polyethylene resin special for cosmetic bottles of claim 1, wherein in the step 1), the catalyst is a composite catalyst loaded with titanium, manganese and triethyl aluminum.
3. The method for preparing antioxidant high density polyethylene resin special for cosmetic bottles of claim 1, wherein the melt mass flow rate in the first polymerization kettle is 10-12g/min, and the melt mass flow rate in the second polymerization kettle is 0.025-0.045 g/min.
4. The preparation method of the antioxidant high-density polyethylene resin special for cosmetic bottles as claimed in claim 1, wherein the purity of the ethylene gas is not less than 99%, the content of CO is less than 43.0mg/kg, and CO is not less than2The content is less than 44.0 mg/kg; the purity of the 1-butene gas is more than or equal to 97%, the water content is less than 425mg/kg, and the total sulfur content is less than 410 mg/kg; the purity of the hydrogen is more than or equal to 95 percent, the content of CO is less than 45.0mg/kg, and CO is2The content is less than or equal to 10.0 mg/kg.
5. The method for preparing the antioxidant high-density polyethylene resin special for cosmetic bottles according to claim 1, wherein in the step 2), the method for preparing the modified natural olive phenol extract comprises the following steps: adding the natural olive phenol extract and a ring-opening catalyst into an ethanol aqueous solution, heating to 75-85 ℃ under the condition of stirring, continuously dropwise adding allyl glycidyl ether, stirring for reaction, keeping the reaction temperature at 60-65 ℃ until the reaction is finished, cooling to normal temperature, recovering the ring-opening catalyst, then carrying out reduced pressure rotary evaporation and concentration to remove the ethanol aqueous solution and the allyl glycidyl ether, and finally carrying out vacuum drying to obtain the modified natural olive phenol extract.
6. The preparation method of the antioxidant high-density polyethylene resin special for cosmetic bottles of claim 5, wherein the ring-opening catalyst is tin chloride loaded resin.
7. The method for preparing the antioxidant high-density polyethylene resin special for cosmetic bottles of claim 6, wherein the mass of the ring-opening catalyst is 1-3% of the modified natural olive phenol extract.
8. The method for preparing antioxidant high density polyethylene resin special for cosmetic bottles of claim 6, wherein the concentration of the ethanol aqueous solution is 60-80wt%, and the concentration of the modified natural olive phenol extract in the ethanol aqueous solution is 5-15 wt%.
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Denomination of invention: Preparation method of a special antioxidant high-density polyethylene resin for cosmetic bottles Granted publication date: 20201218 Pledgee: Taizhou Bank Co.,Ltd. Hangzhou Branch Pledgor: HANGZHOU KANGHONG INDUSTRY & TRADE Co.,Ltd. Registration number: Y2024330000443 |
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