CN102731879A - Material specially used for high density polyethylene hollow container and preparation method thereof - Google Patents
Material specially used for high density polyethylene hollow container and preparation method thereof Download PDFInfo
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- CN102731879A CN102731879A CN2011100865421A CN201110086542A CN102731879A CN 102731879 A CN102731879 A CN 102731879A CN 2011100865421 A CN2011100865421 A CN 2011100865421A CN 201110086542 A CN201110086542 A CN 201110086542A CN 102731879 A CN102731879 A CN 102731879A
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Abstract
The invention relates to a material specially used for a high density polyethylene hollow container and a preparation method thereof. The material specially used for a high density polyethylene hollow container has a doublet molecular weight distribution and comprises a low molecular weight ethylene homopolymer and a high molecular weight ethylene copolymer obtained by copolymerization of ethylene and a C3-6 alpha-olefin, wherein a melt flow rate of the low molecular weight ethylene homopolymer is in a range of 10-30g/10min; a melt flow rate of the high molecular weight ethylene copolymer is in a range of 0.02-0.2g/10min; and the mass of vinyl monomers of the low molecular weight ethylene homopolymer is 30 to 60% of the total mass of vinyl monomers of the material specially used for the high density polyethylene hollow container. The material specially used for a high density polyethylene large hollow container has a doublet molecular weight distribution, has high mechanical strength, good processability, high melt strength and good melting sag resistance in processing, and can satisfy processing and use requirements of a large hollow container having a volume more than 200L.
Description
Technical field
The present invention relates to a kind of high density polyethylene(HDPE) hollow container PP Pipe Compound and preparation method thereof, said PP Pipe Compound is specially adapted to the large-scale hollow container of blowing capacity more than 200L.
Background technology
High density polyethylene(HDPE) (HDPE) has density height, rigidity and good toughness, the excellent characteristics of processing characteristics, and main consumer field is injection, blowing, film and tubing goods.Blow molding system hollow container is the broad aspect that HDPE uses.Large-scale hollow blow molding goods are mainly used in the above industrial bucket of 200L; Because of its dimensional stability is good, Transport Safety is good, have packing and transportation that better chemical resistance and excellent mechanical property, environmental stress cracking resistance (ESCR) are widely used in liquid hazardous type of Chemicals; Approved by many countries and international organization at present, just progressively substitute iron drum.
Patent 200380107285.9 has been described a kind of polyethylene blow molding composition that is used to produce tun, adopts continuous slurry process method to produce, and product molecular weight distribution is the multimodal form.This blow molding composition is fit to the goods of blowing capacity in the 10-150L scope.
Patent 200380104452.4 has been described a kind of polyethylene blow molding composition that is used to produce small containers, adopts continuous slurry process method to produce, and product molecular weight distribution is the multimodal form.This blow molding composition is fit to the goods of blowing capacity in the 0.2-5L scope.
Patent 200880010868.2 relates to a kind of polyethylene molding composition, and this polyethylene molding composition has the multimodal molar mass distribution and is particularly suitable for thermoforming produces the fuel container of capacity in the 20-200L scope.
Sinopec Shandong branch office adopts the Unipol low-pressure vapor phase fluidized bed polymerization process of U.S. UCC; Single Gas-phase reactor production technology; Produce the large-scale hollow container of high density polyethylene(HDPE) (more than the 200L) PP Pipe Compound; Trade name is DMDY-1158, and product molecular weight distribution is unimodal form, and processing characteristics is relatively poor; As commodity market is provided with powdery product, performance is stable inadequately.
The domestic patent report of not seeing the slurry two still tandem process production large-scale hollow container of bimodal distribution Vilaterm (more than the 200L) PP Pipe Compound aspect at present.
Summary of the invention
The present invention provides a kind of high density polyethylene(HDPE) hollow container PP Pipe Compound and preparation method thereof, and said PP Pipe Compound processing characteristics is good, and melt strength is high simultaneously, is specially adapted to the large-scale hollow container of blowing capacity more than 200L.
The applicant finds that after deliberation the large-scale hollow container of the above containment of processing 200L requires PP Pipe Compound must have higher molecular weight; (190 ℃ of melt flow rate(MFR)s (MFR); 21.6kg) between 2～10g/10min, make it have higher melt strength, reduce the drawdown of extruded parisons; Suitable relative molecular mass distributes to satisfy the processing characteristics requirement; Suitably add second monomer and carry out copolymerization, can improve the ESCR performance, to satisfy the use properties requirement.
Melt flow rate(MFR) described in the present invention all is according to testing standard GB/T 3682-2000, under 190 ℃, 21.6kg condition, records.
Said high density polyethylene(HDPE) hollow container PP Pipe Compound has bimodal molecular weight distribution; By low-molecular-weight ethylenic homopolymer and ethene and contain the high molecular weight ethylene copolymer that the alhpa olefin copolymerization of 3～6 carbon atoms generates and form; The melt flow rate(MFR) of therein ethylene homopolymer is 10-30g/10min; The melt flow rate(MFR) of ethylene copolymer is 0.02-0.2g/10min, the vinyl monomer quality in the Alathon be in the high density polyethylene(HDPE) hollow container PP Pipe Compound vinyl monomer total amount 30%～60%.
As preferred version, in the ethylene copolymer quality of alhpa olefin be in the high density polyethylene(HDPE) hollow container PP Pipe Compound vinyl monomer total mass 0.5%～2.0%.
As preferred version, the density of high density polyethylene(HDPE) hollow container PP Pipe Compound is 0.949～0.954g/cm
3
As preferred version, the ethene in the Alathon be in the high density polyethylene(HDPE) hollow container PP Pipe Compound vinyl monomer total amount 40%～50%.The melt flow rate(MFR) of Alathon is preferably 10-22g/10min.
Said alhpa olefin can be propylene, 1-butylene, 1-amylene and 1-hexene.Be preferably 1-butylene.
Said melt flow rate(MFR) is 190 ℃, and the 21.6kg load is melt flow rate(MFR) down.
The preparation method of said high density polyethylene(HDPE) hollow container PP Pipe Compound is: adopt still formula slurry polymerization processes; Two reaction kettle series connection polymerization methodses; In first reaction kettle, form the low-molecular-weight ethylenic homopolymer, make ethene and the alhpa olefin copolymerization that contains 3～6 carbon atoms generate the high-molecular weight ethylene copolymer in second reaction kettle, hydrogen in first reaction kettle/volume of ethylene ratio is 1.0～6.0; Temperature of reaction kettle is 75-90 ℃, and reaction kettle pressure is 0.30～0.90MPa; Hydrogen in second reaction kettle/volume of ethylene ratio is 0.03～0.20, and temperature of reaction kettle is 70-85 ℃, and reaction kettle pressure is 0.10～0.50MPa.
The kind and the consumption of the catalyzer that adopts in the slurry polymerization are prior art, and preferred catalyzer is PZ or RZ (Mitsui Chemicals production), also can be BCH or BCE (Beijing Austria reaches production).
The prepared large-scale hollow container PP Pipe Compound of high density polyethylene(HDPE) of the present invention adopts advanced slurry process, double-reactor series connection production technology; Carrying out hydrogen at first reaction kettle transfers; Form the low molecular weight part of 1/2 left and right sides massfraction, thereby make resin have high-crystallinity; In second reaction kettle, carry out micro-hydrogen and transfer, comonomer is introduced the HMW part.The PP Pipe Compound MWD of producing is bimodal form, molecular weight distributing index α (α=M
w/ M
n) be 24～33, HMW has guaranteed that partly PP Pipe Compound has higher physical strength, low molecular weight part has been given the PP Pipe Compound good processing properties, overcomes the insufficient shortcoming of unimodal structure Vilaterm large-scale hollow container PP Pipe Compound processing characteristics.Simultaneously; Through optimization design to key indexs such as double-reactor ethene, hydrogen and comonomer add-ons; Make PP Pipe Compound have higher melt strength; Guarantee the sag resistant performance of PP Pipe Compound in the course of processing, can satisfy the processing and the request for utilization of the large-scale hollow container of the above containment of 200L.
Embodiment
Melt flow rate(MFR) testing standard: GB/T 3682-2000
Product density testing standard: GB/T 1033-1986
Embodiment 1
Catalyzer RZ and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 30% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 2.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 11g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 70% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.03; Add the comonomer 1-butylene, add-on is 1.0% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.035g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.952g/cm
3
Embodiment 2
Catalyzer RZ and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 40% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 3.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 15g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 60% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.06; Add the comonomer 1-butylene, add-on is 1.2% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.05g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.951g/cm
3
Embodiment 3
Catalyzer RZ and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 45% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 5.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 20g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 55% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 0.9% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.953g/cm
3
Embodiment 4
Catalyzer RZ and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 50% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 4.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 18g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 50% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 5
Catalyst P Z and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 40% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 4.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 18g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 60% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 6
Catalyst P Z and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 45% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 3.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 14g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 55% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 0.9% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.953g/cm
3
Embodiment 7
Catalyst P Z and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 50% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 6.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 22g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 50% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.20; Add the comonomer 1-butylene, add-on is 1.2% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.10g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.952g/cm
3
Embodiment 8
Catalyst P Z and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 48% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 2.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 10g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 52% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.15; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.08g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 9
Catalyst B CH and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 35% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 4.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 18g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 65% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.03; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.04g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 10
Catalyst B CH and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 40% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 4.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 18g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 60% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 11
Catalyst B CH and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 45% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 2.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 11g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 55% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 12
Catalyst B CH and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 48% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 3.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 15g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 52% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.06; Add the comonomer 1-butylene, add-on is 0.9% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.05g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.952g/cm
3
Embodiment 13
Catalyst B CH and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 35% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 4.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 18g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 65% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 1.2% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.951g/cm
3
Embodiment 14
Catalyst B CE and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 45% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 2.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 11g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 55% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.05; Add the comonomer 1-butylene, add-on is 1.1% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.045g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.952g/cm
3
Embodiment 15
Catalyst B CE and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 50% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 3.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 15g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 50% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.10; Add the comonomer 1-butylene, add-on is 1.0% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.952g/cm
3
Embodiment 16
Catalyst B CE and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 48% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 2.0,85 ℃ of temperature of reaction, and reaction pressure 0.55MPa, the melt flow rate(MFR) of controlling polymers is 11g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 52% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.05; Add the comonomer 1-butylene, add-on is 1.3% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.25MPa; Control multipolymer melt flow rate(MFR) 0.045g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.950g/cm
3
Embodiment 17
Catalyst B CE and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 60% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 1.0,75 ℃ of temperature of reaction, and reaction pressure 0.30MPa, the melt flow rate(MFR) of controlling polymers is 14g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 40% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.2; Add comonomer 1-hexene, add-on is 0.5% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.10MPa; Control multipolymer melt flow rate(MFR) 0.06g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.954g/cm
3
Embodiment 18
Catalyst B CE and solvent hexane are added first reaction kettle, and the ethene add-on accounts for 30% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 2.0,78 ℃ of temperature of reaction, and reaction pressure 0.90MPa, the melt flow rate(MFR) of controlling polymers is 10g/10min; Get into second reaction kettle subsequently, the ethene add-on accounts for 70% of total ethene add-on, and control hydrogen/volume of ethylene ratio is 0.05; Add comonomer 1-hexene, add-on is 2.0% of total ethene add-on, 78 ℃ of temperature of reaction; Reaction pressure 0.50MPa; Control multipolymer melt flow rate(MFR) 0.04g/10min, discharging obtains high density polyethylene(HDPE) hollow container PP Pipe Compound, and product density is 0.949g/cm
3
The performance of embodiment 1-18 products obtained therefrom high density polyethylene(HDPE) hollow container PP Pipe Compound is as shown in the table:
Claims (7)
1. high density polyethylene(HDPE) hollow container PP Pipe Compound; Be characterised in that and have bimodal molecular weight distribution; By low-molecular-weight ethylenic homopolymer and ethene and contain the high molecular weight ethylene copolymer that the alhpa olefin copolymerization of 3～6 carbon atoms generates and form; The melt flow rate(MFR) of therein ethylene homopolymer is 10-30g/10min; The melt flow rate(MFR) of ethylene copolymer is 0.02-0.2g/10min, the vinyl monomer quality in the Alathon be in the high density polyethylene(HDPE) hollow container PP Pipe Compound vinyl monomer total amount 30%～60%.
2. high density polyethylene(HDPE) hollow container PP Pipe Compound as claimed in claim 1 is characterized in that, the quality that contains the alhpa olefin of 3～6 carbon atoms in the ethylene copolymer be in the high density polyethylene(HDPE) hollow container PP Pipe Compound vinyl monomer total mass 0.5%～2.0%.
3. high density polyethylene(HDPE) hollow container PP Pipe Compound as claimed in claim 1, the density that it is characterized in that high density polyethylene(HDPE) hollow container PP Pipe Compound is 0.949～0.954g/cm
3
4. high density polyethylene(HDPE) hollow container PP Pipe Compound as claimed in claim 1 is characterized in that the molecular weight distributing index α (α=M of said high density polyethylene(HDPE) hollow container PP Pipe Compound
w/ M
n) be 24～33.
5. like each described high density polyethylene(HDPE) hollow container PP Pipe Compound among the claim 1-4, it is characterized in that ethene in the Alathon be in the high density polyethylene(HDPE) hollow container PP Pipe Compound vinyl monomer total amount 40%～50%.
6. like each described high density polyethylene(HDPE) hollow container PP Pipe Compound among the claim 1-4, it is characterized in that the said alhpa olefin that contains 3～6 carbon atoms is a 1-butylene.
7. the preparation method of each described high density polyethylene(HDPE) hollow container PP Pipe Compound among the claim 1-6; It is characterized in that; Adopt still formula slurry polymerization processes, two reaction kettle series connection polymerization methodses form the low-molecular-weight ethylenic homopolymer in first reaction kettle; In second reaction kettle, make ethene and the alhpa olefin copolymerization that contains 3～6 carbon atoms generate the high-molecular weight ethylene copolymer; Hydrogen in first reaction kettle/volume of ethylene ratio is 1.0～6.0, and temperature of reaction kettle is 75-90 ℃, and reaction kettle pressure is 0.30～0.90MPa; Hydrogen in second reaction kettle/volume of ethylene ratio is 0.03～0.20, and temperature of reaction kettle is 70-85 ℃, and reaction kettle pressure is 0.10～0.50MPa.
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| CN104045756A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | High-density polyethylene copolymer and its preparation method and use |
| CN104098818A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | High-density polyethylene composition and its preparation method and use |
| CN104151754A (en) * | 2014-08-15 | 2014-11-19 | 上海三爱富新材料股份有限公司 | High-fluidity ethylene-tetrafluoroethylene copolymer composition and preparation method thereof |
| CN105295159A (en) * | 2014-07-24 | 2016-02-03 | 中国石化扬子石油化工有限公司 | Polyethylene blow-molding composition for producing bulk container barrels |
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| CN104045756A (en) * | 2013-03-13 | 2014-09-17 | 中国石油天然气股份有限公司 | High-density polyethylene copolymer and its preparation method and use |
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