CN105733023B - Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant - Google Patents

Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant Download PDF

Info

Publication number
CN105733023B
CN105733023B CN201410764954.XA CN201410764954A CN105733023B CN 105733023 B CN105733023 B CN 105733023B CN 201410764954 A CN201410764954 A CN 201410764954A CN 105733023 B CN105733023 B CN 105733023B
Authority
CN
China
Prior art keywords
density polyethylene
composite assistant
hdpe
resistant pipe
high density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410764954.XA
Other languages
Chinese (zh)
Other versions
CN105733023A (en
Inventor
王�华
宋磊
杨勇
张瑞
高宇新
韦德帅
方宏
李岩
王世华
王斯晗
姜进宪
邹恩广
安彦杰
张德英
肖展
王尧
于波
李冬霞
张明强
葛腾杰
王文燕
李波
张丽丽
高晓宇
姜晓强
张绪华
梁利伟
田炳权
姜丽丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
Original Assignee
Petrochina Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petrochina Co Ltd filed Critical Petrochina Co Ltd
Priority to CN201410764954.XA priority Critical patent/CN105733023B/en
Publication of CN105733023A publication Critical patent/CN105733023A/en
Application granted granted Critical
Publication of CN105733023B publication Critical patent/CN105733023B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Rigid Pipes And Flexible Pipes (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention provides a composite additive for a high-density polyethylene pressure-resistant pipe, which comprises 30-50 parts by weight of a long-term aging-resistant additive, 10-30 parts by weight of a thermal stabilizing additive and 10-30 parts by weight of a processing additive, wherein the long-term aging-resistant additive is selected from at least one of a group consisting of hindered phenol antioxidants, amine antioxidants and phosphorus antioxidants, the thermal stabilizing additive is selected from at least one of metal soap stabilizers, and the processing additive is composed of at least one fluoroelastomer. The invention also provides a preparation method of the composite additive and a high-density polyethylene pressure-resistant pipe resin raw material containing the composite additive. The high-density polyethylene pressure-resistant pipe material containing the composite additive has excellent processing performance, and the formed pipe material has excellent environmental stress crack resistance, aging resistance and rigidity-toughness balance.

Description

High density polyethylene (HDPE) pressure resistant pipe material composite assistant and preparation method thereof and contain The resin raw material of the composite assistant
Technical field
It compound is helped the present invention relates to high density polyethylene (HDPE) pressure resistant pipe material composite assistant and preparation method thereof and containing this The high density polyethylene (HDPE) pressure resistant pipe material resin raw material of agent.
Background technology
Polyvinyl piping materials have chemical resistance outstanding, lower temperature resistance, heat-resistant antifriction, welding characteristic excellent, not dirty The performances such as pumped (conveying) medium, service life are long, manufacture mounting cost is low are contaminated, are widely used in fuel gas transmission, water supply, row at present The fields such as dirt, heat supply, petrochemical industry and telecommunications.
The exploitation of polyvinyl piping materials has more than 50 years history so far, and development is generally divided into three phases.First stage Start from the 1950s, this stage occur first generation high density polyethylene (HDPE) (High Density Polyethylene, HDPE) pressure resistant pipe material, performance is poor, is equivalent to PE63 and grade below.Second stage starts from phase late 1970s, There is the PE80 grade special material for tube with higher long-term hydraulic pressure resistant intensity and anti-cracking performance in succession in this stage, due to Environmental stress crack resistance is excellent, and the PE80 grades of special material for tube is in the manufacture of the polyvinyl piping materials of water supply and gas transmission and distribution system It is widely applied.Phase III starts from late 1980s, third generation PE special material for tube occurs in this stage PE100, the PE100 grades of pipe resin under conditions of 20 DEG C, the minimum of tubing must intensity be 10MPa, and service life With the characteristics of 50 years.Also, PE100 grades of tubing of majority have the characteristics that bimodal molecular weight distribution, wherein low molecular weight part The melt viscosity of resin at high shear rates can be effectively reduced, improves the mobility in material processing, ensures that material has High crystallinity, high molecular weight moieties can then assign tubing good mechanical performance.
For example, document " PE100 grades of pipe resin structures and performance study " (elastomer, 2012,22 (4):57~60) in Report the pressure resistant pipe material resin and its properties using the production of autoclave slurry process.Pass through the domestic material with its similar performance And import material is compared, which shows unique performance advantage with resin, but in the publication not The problem of referring to pressure resistant pipe material used additives aspect.
For another example, document " structure of PE100 special material for tube and rheological behaviour research " (plastics science and technology, 2011,39 (3):64 ~66) basic structure performance, the rheological behaviour of three kinds of PE100 special material for tube JHMGC100S, YGH041 and P600 are reported in And the result of study of dynamic rheological behavior.In the document, for the property of autoclave method production PE100 special material for tube JHMGC100S The problem of in terms of technique adjustment direction when energy advantage and tubular object extruding, is summarized.However, not referring to wherein resistance to yet The problem of pressing the auxiliary formula aspect of special material for tube.
A kind of processing aid for polychloroethylene pipes and pipe fitting is disclosed in CN102786622B and uses the processing The poly (vinyl chloride) resin composition of auxiliary agent.The processing aid is prepared using two sections of emulsion polymerization techniques, and when emulsion polymerization adopts Use disodium 4-dodecyl-2,4 '-oxydibenzenesulfonate as emulsifier.First segment monomer composition accounts for 50 weights of monomer composition total amount % is measured, second segment monomer composition accounts for 50 weight % of monomer composition total amount.Second segment monomer composition is dripped using pre-emulsification The method added, polymerization temperature are controlled at 55~75 DEG C, prepare copolymer emulsion, and after lotion is spray-dried again, solid powder is made Product.Wherein, it is in terms of 100% by first segment, second segment monomer composition total weight, styrene is 70~85%, and acrylonitrile is 10~20%, n-BMA is 0~10%.When using the processing aid, can significantly improve polychloroethylene pipes, The hardness and heat-resistant stability of tubing products.
Disclosed in CN102807687A a kind of Compound stabilizer for plastic pipe, and preparation method thereof.The plastic pipe With the group of compound stabilizer become 490~510 parts by weight of stearic acid, 120~130 parts by weight of yellow lead, 25~30 parts by weight of grey calcium, 1~2 parts by weight of acetic acid, 50~60 parts by weight of polyethylene wax, 170~185 parts by weight of tribasic lead sulfate, powdered whiting 350~360 parts by weight, 1~20 weight of 60~80 parts by weight of barium stearate, 10~20 parts by weight of dibasic lead stearate and bisphenol-A Measure part.The compound stabilizer is suitable for plastic pipe, with that stability is good, high lubricating effect, at low cost, lead tolerance are low is excellent Point.
In addition, disclosed in CN101638500B it is a kind of be polymerized using liquid phase noumenal method single loop reactors it is random Polypropylene pipe timber-used composite assistant.The composite assistant is by 10~40 parts by weight of resisting ageing for long time auxiliary agent, processing aid 10 ~30 parts by weight, 20~50 parts by weight of compound modifying agent and 10~30 parts by weight of weather resisting agent composition.Wherein, resisting ageing for long time helps Agent is made of lactone stabilizer, hindered phenol anti-oxidants and nontoxic amine antioxidants, processing aid be fluoroelastomer, low point One kind in sub- polymer arbitrarily matching several mixtures, weather resisting agent by ultra-violet absorber, organic nickel stabilizer and by Hindered amine stabilizer forms, and compound modifying agent is compound modifying agent, the i.e. beta crystal-type nucleater for making alpha-crystal form be converted into beta crystal.It should Composite assistant is the dedicated composite assistant of polypropylene pipe, is not suitable for polyvinyl piping materials, can make atactic copolymerized polypropene tree Processing performance, mechanical property, environmental stress crack resistance and the resisting ageing for long time of fat significantly improve.
High density polyethylene (HDPE) pressure resistant pipe material resin has the characteristics that melt flow rate (MFR) is low, density is high.Therefore, processing is opposite Difficulty, there is sharkskin in the outer wall of the tube wall uneven distribution, tubing that are easy to cause tubing, the inner surface of tubing rough etc. is asked Topic.Also, since such tubing is used in the fields such as water supply, fuel gas transmission mostly, need to bear in use certain Pressure and environmental aging, to also proposed very harsh requirement to its security performance.For this kind of requirement, typically exist A certain amount of special compound additive is added in process, to improve the processability of high density polyethylene (HDPE) pressure resistant pipe material resin Can, the appearance property of tubing article be improved, and assign tubing excellent environmental stress crack resistance and resistance to ag(e)ing, to meet Requirement of the industry to high density polyethylene (HDPE) pressure resistant pipe material.
Invention content
Problems to be solved by the invention
In view of problem above, the purpose of the present invention is to provide a kind of for existing high density polyethylene (HDPE) pressure resistant pipe material Composite assistant and preparation method thereof and resin raw material containing the composite assistant.High-density polyethylene containing the composite assistant Alkene pressure resistant pipe material resin raw material has an excellent processing performance, tubing after forming have excellent environmental stress crack resistance, Resistance to ag(e)ing and rigidity-toughness balanced.
Solution to the problem
The first aspect of the invention is to provide a kind of high density polyethylene (HDPE) pressure resistant pipe material composite assistant, and feature exists In the composite assistant is by 30~50 parts by weight of resisting ageing for long time auxiliary agent, 10~30 parts by weight of thermostabilization auxiliary agent and processing aid 10~30 parts by weight form, wherein resisting ageing for long time auxiliary agent is selected from by hindered phenol anti-oxidants, amine antioxidants and phosphorus At least one of the group of class antioxidant composition, the thermostabilization auxiliary agent in metal soap stabilizer at least one Kind, processing aid is made of at least one fluoroelastomer.
In an embodiment of the invention, the resisting ageing for long time auxiliary agent is by hindered phenol anti-oxidants, amine Antioxidant, phosphorus antioxidants in mass ratio 1:0.1~10:0.1~10 blends.
High density polyethylene (HDPE) pressure resistant pipe material composite assistant according to the first aspect of the invention, wherein Hinered phenols Antioxidant is selected from by 2,6 di t butyl phenol, 2,6- di-t-butyl -4- ethyl -phenols, 2,6- di-t-butyl -4- methylbenzenes Phenol, 2,6- di-t-butyl -4- normal-butyl phenol, 2,6- di-t-butyls-alpha, alpha-dimethyl amino paracresol, 2,4,6- tri-butyl benzenes Phenol, β-(4- hydroxyl -3,5- di-tert-butyl-phenyls) propionic acid n-octadecane alcohol ester, styrenated phenol, butylated octylated phenol, 2,2 '-methylene bis (4- methyl-6-tert-butylphenols), 4,4 '-methylene bis(2,6-di-butyl phenol)s, four (3- (3 ', 5 '-two Tertiary butyl -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester, 1,1,3- tri- (2- methyl -4- hydroxyl -5- tert-butyl-phenyls) butane group At at least one of group.
High density polyethylene (HDPE) pressure resistant pipe material composite assistant according to the first aspect of the invention, wherein amine antioxygen Agent is selected from by N- phenyl-α-naphthylamines, N- phenyl-β-naphthylamines, N, N '-two-betanaphthyls p-phenylenediamine, acetaldol-alpha-naphthylamine, At least one of the group of N- isopropyls-N '-diphenyl-para-phenylene diamine composition.
High density polyethylene (HDPE) pressure resistant pipe material composite assistant according to the first aspect of the invention, wherein Phosphorus antioxygen Agent is selected from hard by triphenyl phosphite, phosphorous acid diphenyl monooctyl ester, trisnonyl phenyl phosphite, diphosphorous acid pentaerythrite two Lipidol ester, phosphorous acid dilauryl, didecyl phosphite, three (2,4- di-t-butyls) phenyl-phosphites, phosphorous acid 4,4- bis- are different Pitch at least one of the group of bis-phenol (12-14) carbon Arrcostab composition.
High density polyethylene (HDPE) pressure resistant pipe material composite assistant according to the first aspect of the invention, wherein metal soap Heat stabilizer be selected from by calcium stearate, magnesium stearate, lithium stearate, zinc stearate, aluminum stearate, odium stearate, calcium laurate, At least one of the group of double stearic acid aluminium composition.
High density polyethylene (HDPE) pressure resistant pipe material composite assistant according to the first aspect of the invention, wherein fluoroelastomer Selected from least one of the group being made of FX-5911, FX-5920, FX-5924, Viton FFGB, SOLEF PVDF.
The second aspect of the invention is to provide the preparation side of above-specified high density polythene pressure pipe timber-used composite assistant Method, which is characterized in that help 30~50 parts by weight of resisting ageing for long time auxiliary agent, 10~30 parts by weight of thermostabilization auxiliary agent and processing After 10~30 parts by weight of agent are mixed and stirred for uniformly, extruding pelletization, to form granular composite assistant, wherein long-term resistance to old Change property auxiliary agent in the group being made of hindered phenol anti-oxidants, amine antioxidants, phosphorus antioxidants at least one Kind, thermostabilization auxiliary agent is selected from least one of metal soap stabilizer, and processing aid is made of at least one fluoroelastomer.
The third aspect of the invention is to provide a kind of resin raw material of manufacture high density polyethylene (HDPE) pressure resistant pipe material, It is characterized in that, the resin raw material is involved by high density polyethylene (HDPE) pressure resistant pipe material base resin and the first aspect of the invention High density polyethylene (HDPE) pressure resistant pipe material formed with composite assistant.
Resin raw material according to the third aspect of the present invention, wherein relative to resin raw material total amount, high density polyethylene (HDPE) The additive amount of pressure resistant pipe material composite assistant is 0.1~1 weight %.In the preferred embodiment of the present invention, described In resin raw material, relative to resin raw material total amount, the additive amount of high density polyethylene (HDPE) pressure resistant pipe material composite assistant is 0.4~ 0.5 weight %.
The effect of invention
1) composite assistant of high density polyethylene (HDPE) pressure resistant pipe material of the invention can significantly improve the processability of resin raw material Can, obtained hdpe pipe has excellent environmental stress crack resistance, pressure-resistant performance, resisting ageing for long time, There are the mechanical properties such as good rigidity-toughness balanced simultaneously.
2) it after the composite assistant body of the addition present invention, can significantly improve through double kettle series connection (or in parallel) the polymerization works of slurry process The processing difficulties that the high density polyethylene (HDPE) of skill manufacture occurs in tube extrusion, and tubing poor appearance, inner wall can be improved a little Shape object or rough, sharkskin occur etc. problem, while will not to mechanical characteristics such as the resistance to pressures of hdpe pipe Generate harmful effect.
Specific implementation mode
In the present invention, hdpe pipe composite assistant (hereinafter, being also referred to simply as " composite assistant ") is by long-term resistance to 30~50 parts by weight of aging auxiliary agent, 10~30 parts by weight of thermostabilization auxiliary agent and 10~30 parts by weight of processing aid composition.Its In, resisting ageing for long time auxiliary agent is selected from the group being made of hindered phenol anti-oxidants, amine antioxidants and phosphorus antioxidants At least one of group, the thermostabilization auxiliary agent are selected from least one of metal soap stabilizer, and the processing aid is by extremely A kind of few fluoroelastomer composition.
In an embodiment of the invention, resisting ageing for long time auxiliary agent is to resist hindered phenol anti-oxidants, amine Oxidant, phosphorus antioxidants in mass ratio 1:0.1~10:Compound system made of 0.1~10 blending, wherein preferably Hindered phenol anti-oxidants, amine antioxidants, phosphorus antioxidants are 1 in mass ratio:0.2~5:0.2~5 range, into One step is preferably 1:0.5~2:0.5~2 range.
In the present invention, hindered phenol anti-oxidants are selected from by 2,6- DI-tert-butylphenol compounds, 2,6- di-t-butyl -4- ethylo benzenes Phenol, 2,6- di-tert-butyl-4-methy phenols, 2,6- di-t-butyl -4- normal-butyl phenol, 2,6- di-t-butyls-alpha, alpha-dimethyl amino Paracresol, 2,4,6- tri-butyl-phenols, β-(4- hydroxyl -3,5- di-tert-butyl-phenyls) propionic acid n-octadecane alcohol ester, styrene Change phenol, butylated octylated phenol, 2,2 '-methylene bis (4- methyl-6-tert-butylphenols), 4,4 '-methylene bis (bis- uncles of 2,6- Butylphenol), four (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol esters, (2- methyl-the 4- of 1,1,3- tri- Hydroxyl -5- tert-butyl-phenyls) butane composition at least one of group.
In the present invention, as amine antioxidants, can enumerate aromatic amine and its derivative, amides anti-aging agent, Ketone amines antioxidants etc., wherein the preferably secondary diarylamines class antioxidant such as p-phenylenediamine.Amine antioxidants to oxygen, The barrier propterty of ozone is good, has excellent discolouration and nonstaining property, can be used in dark product or be wanted to the color of product Seek not high situation.In an embodiment of the invention, amine antioxidants is selected from by N- phenyl-α-naphthylamines, N- phenyl- Beta-naphthylamine, N, N '-two-betanaphthyls p-phenylenediamine, acetaldol-alpha-naphthylamine, N- isopropyls-N '-diphenyl-para-phenylene diamine composition At least one of group.
Phosphite antioxidant can be obviously improved high density polyethylene (HDPE) pressure pipe when being shared with phenol antioxidant The discolouration and embrittlement characteristic of material.In the present invention, phosphorus antioxidants are selected from pungent by triphenyl phosphite, phosphorous acid diphenyl Ester, trisnonyl phenyl phosphite, diphosphorous acid pentaerythrite distearyl alcohol ester, phosphorous acid dilauryl, didecyl phosphite, three In the group that (2,4- di-t-butyls) phenyl-phosphite, bis- different fork bis-phenol (12-14) carbon Arrcostabs of phosphorous acid 4,4- form extremely Few one kind.
In the hdpe pipe composite assistant of the present invention, thermostabilization auxiliary agent is metal soap stabilizer, this Kind metal soap stabilizer is referred to as plumper, halogen-absorber again, is that common one kind adds in polyvinyl resin powder Add agent.The activity of catalyst when in general, in order to improve olefinic polymerization or copolymerization, can introduce pole in polymerization reaction system Property comonomer, radical initiator and Ziegler catalyst etc., it is poly- that the introducings of these substances can cause acid product to remain in It closes in product.For example, when manufacturing olefin polymer using Ziegler catalyst, would generally be remained a small amount of (10-6 grades) in product Chlorine-containing compound.The presence of these chlorine-containing compounds can lead to the corruption of metal-working plant (for example, drier, mold apparatus) Erosion, while also resulting in the deterioration of the physical properties such as the changing colour of polymer product, embrittlement.At this point, the addition energy of thermostabilization auxiliary agent Enough improve the overall performance of polymer product.In the present invention, the gold in being formed with composite assistant for hdpe pipe Belonging to soaps heat stabilizer, there is no particular limitation, for example, it may be selected from by calcium stearate, magnesium stearate, lithium stearate, tristearin At least one of the group of sour zinc, aluminum stearate, odium stearate, calcium laurate, double stearic acid aluminium composition.
In the present invention, fluoroelastomer is that it is poly- can to improve high density with the processing aid that fluoropolymer is basic structure The processing fluidity of vinyl, and to playing lubricating action by the polyvinyl resin melt of mold, to improve melt Extrusion performance and extrusion efficiency.In the present invention, as fluoroelastomer, for example, it may be selected from by FX-5911, FX-5920, FX- 5924, at least one of the group of Viton FFGB, SOLEF PVDF composition.
In the present invention, the method for preparing high density polyethylene (HDPE) pressure resistant pipe material composite assistant is limited there is no special It is fixed, for example, it may be 30~50 parts by weight of resisting ageing for long time auxiliary agent, 10~30 parts by weight of thermostabilization auxiliary agent and processing are helped After 10~30 parts by weight of agent are mixed and stirred for uniformly, extruding pelletization, to obtain granular composite assistant.At one of the present invention It is by 30~50 weight of resisting ageing for long time auxiliary agent when preparing high density polyethylene (HDPE) pressure resistant pipe material composite assistant in embodiment Amount part, 10~30 parts by weight of thermostabilization auxiliary agent and 10~30 parts by weight of processing aid are added in high speed mixing smelting machine, are stirred at room temperature Mix, mix 5~after twenty minutes, it is transferred to powder extruder, is squeezed out under 20 DEG C~50 DEG C of cold working temperature, to make Obtain granular composite assistant.
In the present invention, the resin raw material of manufacture high density polyethylene (HDPE) pressure resistant pipe material is by high density polyethylene (HDPE) pressure resistant pipe material Base resin and the high density polyethylene (HDPE) pressure resistant pipe material of the present invention are formed with composite assistant.Wherein, total relative to resin raw material Amount, the additive amount of high density polyethylene (HDPE) pressure resistant pipe material composite assistant of the invention are the range of 0.1~1 weight %, preferably The range of 0.3~0.6 weight %, the further preferably range of 0.4~0.5 weight %.By the composite assistant of the present invention and height After density polyethylene pressure resistant pipe material base resin is blended by certain Blend proportion, 180 DEG C~250 DEG C of processing temperatures into Row melting mixing is granulated, then the extrusion molding in pipe extruder after being plasticized uniformly, you can obtains high density polyethylene (HDPE) pressure resistance Tubing.
In the present invention, do not have for high density polyethylene (HDPE) pressure resistant pipe material base resin (hereinafter, being also referred to as " base resin ") Be particularly limited to, for example, may be used Ziegler catalyst, philip catalyst or CGC/ borate esters catalyst (that is, by Carrier loaded single-activity site catalyst), it is poly- to manufacture high density by double kettle series connection (or in parallel) polymerization techniques of slurry process Ethylene base resin.In the present invention, as high density polyethylene (HDPE) base resin, Ziegler catalyst, CGC/ boron are preferably used The manufacture of esters of gallic acid catalyst, by Alathon, the copolymer of vinyl monomer and other 'alpha '-olefin monomers or by ethylene homo The copolymer blended rear high-density polyethylene resin formed of object and vinyl monomer and other 'alpha '-olefin monomers.Wherein, as second The copolymer of alkene monomer and other 'alpha '-olefin monomers can be α-alkene that the carbon atom number of vinyl monomer and a kind or more is 3~20 The copolymer of hydrocarbon monomer, and 'alpha '-olefin monomers unit is in range of the content ratio 0.5~2.0% of copolymer entirety, preferably In 1.0~2.0% range.The density of high-density polyethylene resin is influenced by monomer component composition, the molecular weight with resin And it is uncorrelated.In the present invention, for the density of high-density polyethylene resin, there is no particular limitation, for example, can be in 940Kg/ m3~980Kg/m3Range, preferably 940Kg/m3~970Kg/m3Range, further preferably 940Kg/m3~960Kg/ m3Range.
In the present invention, for the molecular weight of high density polyethylene (HDPE) pressure resistant pipe material base resin, there is no particular limitation, for example, Weight average molecular weight can 20,000~500,000 range, range of the preferable weight-average molecular weight 40,000~300,000. The high density polyethylene (HDPE) with bimodal molecular weight distribution can be produced by the series connection of double kettles (or in parallel) polymerization technique, wherein Lower molecular wt part makes polymerizate that there is high density characteristic, high molecular weight moieties polymerizate then to be made to have larger glue Degree.Here, so-called high and low molecular weight is that have two kinds of ingredients in the high density polyethylene (HDPE) of bimodal molecular weight distribution phase each other For, it is not offered as absolute numberical range.Also, the molecular weight of high-density polyethylene resin substantially with its melt index (Melt Flow Rate, MFR) is corresponding, in general, the weight average molecular weight of resin powder is capable of the molten of reinforced resin powder when high Body intensity, and the tubing enabled to has superior toughness and environmental stress crack resistance, but higher molecular weight Process operation can be made to be deteriorated, add the higher pressure of man-hour requirement or temperature.In the present invention, as high-density polyethylene resin powder The melt index of material is appropriately 0.01g/10 minutes~100g/10 minutes ranges in 230 DEG C, 21.6Kg loads, excellent Be selected in 230 DEG C, 21.6Kg loads when for 0.1g/10 minutes~50g/10 minutes ranges, further preferably 230 DEG C, It is 1g/10 minutes~10g/10 minutes ranges when 21.6Kg is loaded.By the molecule for controlling high-density polyethylene resin powder Amount, can adjust the range of its melt index, so as to significantly improve its process operation.
After the composite assistant for adding the present invention in high density polyethylene (HDPE) pressure resistant pipe material base resin, pipe can significantly improve Material the resin processing difficulties that occur and the tubing poor appearance of forming, inner wall when squeezing out have pointing object or it is rough, there is shark The problems such as skin, while the processing performance of high density polyethylene (HDPE) pressure resistant pipe material, pressure resistance performance, resisting ageing for long time, resistance to ring can be made Border stress cracking resistance and mechanical property significantly improve.
As needed, composite assistant of the invention can also coordinate with other well known additives is added to high-density polyethylene In alkene pressure resistant pipe material base resin, to play the modifying function of collaboration.As these well known additives, for example, it may be Antiblocking agent, antistatic agent, lubricant, weather resisting agent, light stabilizer, ultra-violet absorber, inorganic or organic filler, organic peroxy Compound, neutralizer etc..In the present invention, for antiblocking agent, there is no particular limitation, specifically, talcum, oxidation can be enumerated Inoganic solids powder such as silicon, kaolinite etc..It as antistatic agent, is not particularly limited, for example, alkylsurfuric acid can be enumerated The nonionics such as salt form anionic antistatic agents, Quaternary Cation Antistatic Agent, polyoxyethylene sorbitan monostearate Property antistatic agent, betaines both sexes antistatic agent etc..As lubricant, also there is no particular limitation, for example, Asia can be enumerated The fat hydrocarbons lubricants such as ethyl double stearamide, butyl stearate, polyethylene wax, solid paraffins, higher fatty acids lubricant, Aliphatic amide series lubricant agent, fatty acid ester type emollients etc..In the present invention, for weather resisting agent, there is no particular limitation, specifically Ground is said, resorcin compound, salicylic acid ester type compound, benzotriazole compound, Benzophenone class chemical combination can be enumerated Object, hindered amine compound etc..As light stabilizer, for example, hindered amine compound, benzo three can be enumerated but be not limited to Azole compounds, compound in triazine class, Benzophenone class compound, benzoic acid salt compound etc..As ultra-violet absorber, For example, benzotriazole compound, compound in triazine class, Benzophenone class compound etc. can be enumerated but be not limited to.As nothing Machine filler, there is no particular limitation in the present invention, specifically, fibrous, microgranular, sheet and hollow oxygen can be enumerated SiClx, quartz powder, bead, calcium silicates, diatomite, iron oxide, titanium oxide, alumina silicate, aluminium oxide, magnesium carbonate, silicon nitride, The inorganic fillers such as boron nitride.As organic filler, also there is no particular limitation in the present invention, specifically, shallow lake can be enumerated The powder of powder, producing starch, wooden slurry, chitin/chitosan class, cocoanut shell, bamboo matter powder, bark powder, kenaf etc. Body.As organic peroxide, for example, diacyl peroxide class, peroxidating ketone, peroxidating can be enumerated but be not limited to Hydrogen species, dialkyl peroxide class, ketal peroxide class, peroxy acid alkyl esters and peroxycarbonic acid esters etc..As neutralizer, There is no particular limitation in the present invention, for example, various Metallic stearates, Hydrotalcite etc. can be enumerated.
Hereinafter, the present invention is described further in conjunction with the embodiments.Without saying, the present invention is not by these embodiments more Limitation.Also, in the range of not departing from general idea of the present invention, change, deformation or variation that these embodiments are done Etc. belonging in scope of the invention.
Hereinafter, Examples 1 to 6 is the preparation of the composite assistant for illustrating the present invention, comparative example 1 is existing for illustrating The preparation of the polythene pressure pipe timber-used composite assistant of technology.
Embodiment 1
By 100g tetra- (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester (that is, bisphenols antioxygen Agent 1010), 80g tri- (2,4- di-t-butyls) phenyl-phosphite (trade (brand) name:Mark2112), 60g calcium stearates, 6g fluorine elasticity Body Viton FFGB (E.I.Du Pont Company's system) are added in mixing machine, are mixed at room temperature after five minutes, are sent into powder extruder, room temperature Lower pressure squeezes out, and obtains granular composite assistant (GC-1).
Embodiment 2
By 100g tetra- (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester, (2,4- bis- of 100g tri- Tertiary butyl) phenyl-phosphite, 60g calcium stearates, 7g fluoroelastomer Viton FFGB (E.I.Du Pont Company's system) be added in mixing machine, It mixes at room temperature after ten minutes, is sent into powder extruder, force to squeeze out at room temperature, obtain granular composite assistant (GC-2).
Embodiment 3
By 100g tetra- (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester, (2,4- bis- of 120g tri- Tertiary butyl) phenyl-phosphite, 60g calcium stearates, 8 grams of fluoroelastomer Viton FFGB (E.I.Du Pont Company's system) are added to mixing machine In, it mixes at room temperature after twenty minutes, is sent into powder extruder, force to squeeze out at room temperature, obtain granular composite assistant (GC-3).
Embodiment 4
By 100g tetra- (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester, (2,4- bis- of 100g tri- Tertiary butyl) phenyl-phosphite, 60g metal soap stabilizers (wherein, calcium stearate and zinc stearate are respectively 30 grams), 6g fluorine elasticity Body Viton FFGB (E.I.Du Pont Company's system) are added in mixing machine, are mixed at room temperature after five minutes, are sent into powder extruder, room temperature Lower pressure squeezes out, and obtains granular composite assistant (GC-4).
Embodiment 5
By 100g tetra- (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester, (2,4- bis- of 100g tri- Tertiary butyl) phenyl-phosphite, 80g metal soap stabilizers (wherein, calcium stearate and zinc stearate are respectively 40 grams), 7g fluorine elasticity Body Viton FFGB (E.I.Du Pont Company's system) are added in mixing machine, are mixed at room temperature after ten minutes, are sent into powder extruder, room temperature Lower pressure squeezes out, and obtains granular composite assistant (GC-5).
Embodiment 6
By 100g tetra- (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol ester, (2,4- bis- of 100g tri- Tertiary butyl) phenyl-phosphite, 100g metal soap stabilizers (wherein, calcium stearate and zinc stearate are respectively 50 grams), 8g fluorine bullets Property body Viton FFGB (E.I.Du Pont Company's system) be added in mixing machine, mix at room temperature after twenty minutes, be sent into powder extruder, room Temperature is lower to force to squeeze out, and obtains granular composite assistant (GC-6).
Comparative example 1
By polyethylene wax 2000g, 100g composite antioxidant, 700g metal soap stabilizers, (wherein, calcium stearate is 200g, zinc stearate 500g), 100g FX-5920 (the extraordinary fluoropolymer additive of Minnesota Mining and Manufacturing Company) are added to It in mixing machine, mixes after twenty minutes, is sent into cone-type mixer at room temperature, force to squeeze out at room temperature, obtain granular compound help Agent (DB-1).
Hereinafter, Production Example 1~6 is the high-density polyethylene of composite assistant GC-1~GC-6 for illustrating to have blended the present invention The manufacture of alkene pressure resistant pipe material resin raw material and the performance evaluation after forming tubular product.It is for illustrating to blend to manufacture comparative example 1 After the manufacture of the high density polyethylene (HDPE) pressure resistant pipe material resin raw material of the composite assistant DB-1 of comparative example 1 and forming tubular product Performance evaluation.
Production Example 1
By 300g GC-1 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after forming tubular product Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is more than 120 minutes, yield strength 24.1MPa, and impact strength is 55.1KJ/m2.Individual base resin is shown in table 1 and the performance of the pipe resin of GC-1 has been blended in base resin Compare.
Production Example 2
By 250g GC-2 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after forming tubular product Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is more than 120 minutes, yield strength 25.2MPa, and impact strength is 54.2KJ/m2.Individual base resin is shown in table 1 and the performance of the pipe resin of GC-2 has been blended in base resin Compare.
Production Example 3
By 200g GC-3 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after forming tubular product Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is more than 120 minutes, yield strength 25.3MPa, and impact strength is 53.4KJ/m2.Individual base resin is shown in table 1 and the performance of the pipe resin of GC-3 has been blended in base resin Compare.
Production Example 4
By 300g GC-4 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after forming tubular product Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is more than 120 minutes, yield strength 24.8MPa, and impact strength is 55.7KJ/m2.Individual base resin is shown in table 1 and the performance of the pipe resin of GC-4 has been blended in base resin Compare.
Production Example 5
By 250g GC-5 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after forming tubular product Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is more than 120 minutes, yield strength 25.9MPa, and impact strength is 53.4KJ/m2.Individual base resin is shown in table 1 and the performance of the pipe resin of GC-5 has been blended in base resin Compare.
Production Example 6
By 200g GC-6 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after tube forming Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is more than 120 minutes, yield strength 24.3MPa, and impact strength is 55.4KJ/m2.Individual base resin is shown in table 1 and the performance of the pipe resin of GC-6 has been blended in base resin Compare.
Manufacture comparative example 1
By 200g DB-1 and 50Kg high density polyethylene (HDPE) pressure resistant pipe materials base resin, (under conditions of 5Kg loads, MFR exists The PE100 grade pipe resins powder of 0.2~0.4g/10 minutes bimodal molecular weight distributions) it is uniformly mixed with high speed mixing smelting machine, it uses Double screw extruder is shaped in 200 DEG C of extruding pelletizations, with single screw rod pipe extruder in 210 DEG C of crowded pipes.It is inside and outside after tube forming Wall is smooth, even tube wall.Also, the oxidation induction period of tubing is 35 minutes, yield strength 24.0MPa, and impact strength is not Fracture.The performance for showing individual base resin in table 1 and having blended the pipe resin of DB-1 in base resin compares.
Also, Production Example 1~6 is shown in table 2 and manufactures the performance test results of the forming tube of comparative example 1.
As shown in Table 1, it is resistance to can be obviously improved the high density polyethylene (HDPE) that autoclave slurry process produces to composite assistant of the invention Press processing performance, antioxygenic property and the mechanical property of pipe resin.Also, after the composite assistant for having blended the present invention, tubing Oxidation induction period be more than 120 minutes, impact strength is more than 50KJ/m2.Also, as shown in Table 2, with blended the present invention The hydrostatic index of tubing of φ 32mm × 3mm tubing of the pipe resin raw material forming of composite assistant has reached national standard.
By above example 1~6 and comparative example 1 it is found that compared with existing composite assistant DB-1, of the invention answers The composition for closing auxiliary agent is more simple, and the dosage of constituent is also more reasonable.Also, by table 1,2 it is found that having blended the present invention Composite assistant after, the various physical property of pipe resin are more rational, and (specific targets are melt index to the processing performance of forming tube Front and back variation) and the pipe performances such as longitudinal welds become more excellent.Therefore, blend the present invention's in base resin After composite assistant, the high density polyethylene (HDPE) pressure resistant pipe material resin that can solve to manufacture through autoclave slurry process occurs in extrusion molding Processing difficulties and forming tubular product after poor appearance, inner wall have pointing object or it is rough, there is the problems such as sharkskin, also, energy Enough make high density polyethylene (HDPE) pressure resistant pipe material that there is excellent antioxygenic property, mechanical property, environmental stress crack resistance and pressure resistance Performance, and disclosure satisfy that the currently requirement to PE100 grades of pressure resistant pipe materials.

Claims (10)

1. a kind of high density polyethylene (HDPE) pressure resistant pipe material composite assistant, which is characterized in that
The composite assistant is helped by 30~50 parts by weight of resisting ageing for long time auxiliary agent, 10~30 parts by weight of thermostabilization auxiliary agent and processing 10~30 parts by weight of agent form, wherein
The resisting ageing for long time auxiliary agent is selected from and is made of hindered phenol anti-oxidants, amine antioxidants and phosphorus antioxidants At least one of group,
The thermostabilization auxiliary agent is selected from least one of metal soap stabilizer,
The processing aid is made of a kind of fluoroelastomer, and the fluoroelastomer is Viton FFGB.
2. high density polyethylene (HDPE) pressure resistant pipe material composite assistant as described in claim 1, wherein the resisting ageing for long time helps Agent is by hindered phenol anti-oxidants, amine antioxidants, phosphorus antioxidants in mass ratio 1:0.1~10:0.1~10 blending It forms.
3. high density polyethylene (HDPE) pressure resistant pipe material composite assistant as claimed in claim 1 or 2, wherein
The hindered phenol anti-oxidants are selected from by 2,6 di t butyl phenol, 2,6- di-t-butyl -4- ethyl -phenols, 2,6- bis- Tert-butyl-4-methyl-Phenol, 2,6- di-t-butyl -4- normal-butyl phenol, 2,6- di-t-butyls-alpha, alpha-dimethyl amino paracresol, 2, 4,6- tri-butyl-phenols, β-(4- hydroxyl -3,5- di-tert-butyl-phenyls) propionic acid n-octadecane alcohol ester, styrenated phenol, fourth The octylatcd phenol of baseization, 2,2 '-methylene bis (4- methyl-6-tert-butylphenols), 4,4 '-methylene bis (2,6- di-tert-butyls Phenol), four (3- (3 ', 5 '-di-t-butyls -4 '-hydroxy phenyl) propionic acid) pentaerythritol esters, (2- methyl -4- the hydroxyls-of 1,1,3- tri- 5- tert-butyl-phenyls) butane composition at least one of group.
4. high density polyethylene (HDPE) pressure resistant pipe material composite assistant as claimed in claim 1 or 2, wherein
The amine antioxidants is selected from by N- phenyl-α-naphthylamines, N- phenyl-β-naphthylamines, N, N '-two-betanaphthyls p-phenylenediamine, At least one of the group of acetaldol-alpha-naphthylamine, N- isopropyls-N '-diphenyl-para-phenylene diamine composition.
5. high density polyethylene (HDPE) pressure resistant pipe material composite assistant as claimed in claim 1 or 2, wherein
The phosphorus antioxidants are selected from by triphenyl phosphite, phosphorous acid diphenyl monooctyl ester, trisnonyl phenyl phosphite, two Asias Phosphoric acid pentaerythrite distearyl alcohol ester, phosphorous acid dilauryl, didecyl phosphite, three (2,4- di-t-butyls) phosphorous acid benzene At least one of the group of ester, bis- different fork bis-phenol (12-14) carbon Arrcostabs of phosphorous acid 4,4- composition.
6. high density polyethylene (HDPE) pressure resistant pipe material composite assistant as described in claim 1, wherein
The metal soap stabilizer be metal soap thermal stabilizers, the metal soap thermal stabilizers be selected from by calcium stearate, In the group that magnesium stearate, lithium stearate, zinc stearate, aluminum stearate, odium stearate, calcium laurate, double stearic acid aluminium form At least one.
7. a kind of preparation method of high density polyethylene (HDPE) pressure resistant pipe material composite assistant, is to prepare height described in claim 1 The method of density polyethylene pressure resistant pipe material composite assistant, which is characterized in that
By 10~30 weight of 30~50 parts by weight of resisting ageing for long time auxiliary agent, 10~30 parts by weight of thermostabilization auxiliary agent and processing aid After amount part is mixed and stirred for uniformly, extruding pelletization, to form granular composite assistant, wherein
The resisting ageing for long time auxiliary agent is selected from and is made of hindered phenol anti-oxidants, amine antioxidants, phosphorus antioxidants At least one of group,
The thermostabilization auxiliary agent is selected from least one of metal soap stabilizer,
The processing aid is made of a kind of fluoroelastomer, and the fluoroelastomer is Viton FFGB.
8. a kind of resin raw material of manufacture high density polyethylene (HDPE) pressure resistant pipe material, which is characterized in that
The resin raw material is described in any one of high density polyethylene (HDPE) pressure resistant pipe material base resin and claim 1~6 High density polyethylene (HDPE) pressure resistant pipe material is formed with composite assistant.
9. resin raw material as claimed in claim 8, wherein relative to the resin raw material total amount, the high density polyethylene (HDPE) The additive amount of pressure resistant pipe material composite assistant is 0.1~1 weight %.
10. resin raw material as claimed in claim 9, wherein relative to the resin raw material total amount, the high density polyethylene (HDPE) The additive amount of pressure resistant pipe material composite assistant is 0.4~0.5 weight %.
CN201410764954.XA 2014-12-11 2014-12-11 Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant Active CN105733023B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410764954.XA CN105733023B (en) 2014-12-11 2014-12-11 Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410764954.XA CN105733023B (en) 2014-12-11 2014-12-11 Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant

Publications (2)

Publication Number Publication Date
CN105733023A CN105733023A (en) 2016-07-06
CN105733023B true CN105733023B (en) 2018-08-10

Family

ID=56241314

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410764954.XA Active CN105733023B (en) 2014-12-11 2014-12-11 Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant

Country Status (1)

Country Link
CN (1) CN105733023B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108610531A (en) * 2016-12-09 2018-10-02 中国石油天然气股份有限公司 Polyethylene pipe composite auxiliary agent bag and preparation method thereof
CN109092375B (en) * 2017-06-21 2021-06-22 中国石油化工股份有限公司 Free radical stabilizer for preparing adipic acid by direct oxidation of cyclohexane
CN110100777A (en) * 2019-03-25 2019-08-09 广东南风王科技有限公司 A kind of cordless super strong type cultivation frame
CN113881151A (en) * 2020-07-02 2022-01-04 中国石油天然气股份有限公司 Special polybutylene resin composition for cold and hot water pipes and preparation method thereof
CN112898663A (en) * 2021-01-25 2021-06-04 孙牡花 PE composite material and preparation method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9376558B2 (en) * 2009-05-29 2016-06-28 Milliken & Company Polymer compositions, articles made from such compositons, and methods for molding such compositions
CN103524861B (en) * 2012-07-05 2016-10-26 中国石油化工股份有限公司 A kind of pressure polyethylene composition high temperature resistant, high

Also Published As

Publication number Publication date
CN105733023A (en) 2016-07-06

Similar Documents

Publication Publication Date Title
CN105733023B (en) Composite assistant for high-density polyethylene pressure-resistant pipe, preparation method thereof and resin raw material containing composite assistant
CN102382344B (en) Composition for preparing polyethylene pipe with superhigh molecular weight and preparation method thereof
KR101531935B1 (en) Compositions including polytetrafluoroethylene and processes for the preparation thereof
CN104140616B (en) A kind of high resiliency environment-friendly PVC is material modified and preparation method thereof
CN102634138B (en) A kind of polyvinyl chloride (PVC) Compound of high elongation at tear
CN102464832A (en) High-temperature-resistant thermoplastic elastomer for coating vulcanized rubber hose
CN102276913B (en) Polypropylene material for MPP (modified polypropylene) jacking pipe
CN102863711A (en) Heat-resisting PVC high impact-resisting tubular product and preparation method thereof
CN104327369B (en) A kind of polypropene composition and polypropylene granules
CN104292595A (en) High-rigid linear low-density polyethylene injection moulding resin
CN103382274B (en) A kind of block copolymerization polypropylene composite additive
EP2989157A1 (en) Multimodal polypropylene composition for pipe applications
CN102002191A (en) PPR/EVOH/POE (Pentatricopeptide Repeats/Ethylene-Vinyl Alcohol/Polyolefin Elastomer) blending high-impact barrier pipe and manufacturing method thereof
CN108219326A (en) A kind of high impact PVC pipe formula and preparation method thereof
JP2006193671A (en) Polyethylene resin material and hollow molded article made thereof
CN104837919A (en) Heat aging resistant ethylene vinly acetate copolymer composition and process for producing same
CN102816383A (en) High temperature and pressure resistant filter plate of filter press
CN102952330B (en) Low-odor polypropylene resin and preparation method thereof
KR20140074887A (en) Polyethylene additive compositions and articles made from same
CN103421236A (en) Polypropylene composition and polypropylene blown film
CN102295799B (en) Polyethylene resin composition for pipes
CA3008857C (en) Partially-crosslinked polyethylene formulations and methods of making same
CN104962027B (en) A kind of elastomer alloy material and preparation method thereof
CN106317546A (en) High-density polyethylene resin for large hollow containers
CN111040307A (en) Polypropylene corrugated pipe composite material and preparation method of composite polypropylene corrugated pipe

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant