CN1282699C - Radiation crosslinked polyethylene pipe and its preparation method - Google Patents
Radiation crosslinked polyethylene pipe and its preparation method Download PDFInfo
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- CN1282699C CN1282699C CN 200410026533 CN200410026533A CN1282699C CN 1282699 C CN1282699 C CN 1282699C CN 200410026533 CN200410026533 CN 200410026533 CN 200410026533 A CN200410026533 A CN 200410026533A CN 1282699 C CN1282699 C CN 1282699C
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- tubing
- antioxidant
- crosslinked
- acid ester
- radiation
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- 230000005855 radiation Effects 0.000 title claims abstract description 22
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims description 14
- 239000004703 cross-linked polyethylene Substances 0.000 title claims description 14
- 238000002360 preparation method Methods 0.000 title claims description 12
- -1 polyethylene Polymers 0.000 claims abstract description 29
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 21
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000000314 lubricant Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 37
- 229920001903 high density polyethylene Polymers 0.000 claims description 20
- 239000004700 high-density polyethylene Substances 0.000 claims description 20
- 229920002554 vinyl polymer Polymers 0.000 claims description 18
- 239000002253 acid Substances 0.000 claims description 12
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 10
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical class OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 229910021645 metal ion Inorganic materials 0.000 claims description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 15
- 239000004698 Polyethylene Substances 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical class CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 abstract 2
- 229920013716 polyethylene resin Polymers 0.000 abstract 2
- 239000003431 cross linking reagent Substances 0.000 abstract 1
- 238000004132 cross linking Methods 0.000 description 26
- 239000000203 mixture Substances 0.000 description 13
- 239000003112 inhibitor Substances 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 239000012752 auxiliary agent Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 239000006229 carbon black Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000077 silane Inorganic materials 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002706 hydrostatic effect Effects 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- 150000003254 radicals Chemical class 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 239000012190 activator Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N itaconic acid Chemical compound OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 235000019260 propionic acid Nutrition 0.000 description 2
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000008313 sensitization Effects 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 description 1
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- DBCAQXHNJOFNGC-UHFFFAOYSA-N 4-bromo-1,1,1-trifluorobutane Chemical compound FC(F)(F)CCCBr DBCAQXHNJOFNGC-UHFFFAOYSA-N 0.000 description 1
- NHDARDBWQBLLPL-UHFFFAOYSA-N CN(C)C.C=CC(OCC(CO)O)=O Chemical compound CN(C)C.C=CC(OCC(CO)O)=O NHDARDBWQBLLPL-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- VRFNYSYURHAPFL-UHFFFAOYSA-N [(4-methylphenyl)sulfonylamino]urea Chemical compound CC1=CC=C(S(=O)(=O)NNC(N)=O)C=C1 VRFNYSYURHAPFL-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- XHFVDZNDZCNTLT-UHFFFAOYSA-H chromium(3+);tricarbonate Chemical compound [Cr+3].[Cr+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O XHFVDZNDZCNTLT-UHFFFAOYSA-H 0.000 description 1
- GTZCVFVGUGFEME-IWQZZHSRSA-N cis-aconitic acid Chemical compound OC(=O)C\C(C(O)=O)=C\C(O)=O GTZCVFVGUGFEME-IWQZZHSRSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- PJANXHGTPQOBST-VAWYXSNFSA-N trans-stilbene Chemical group C=1C=CC=CC=1/C=C/C1=CC=CC=C1 PJANXHGTPQOBST-VAWYXSNFSA-N 0.000 description 1
- 229960004418 trolamine Drugs 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical class [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to crosslinked radiation polyethylene tubing, which has a stereo meshy crosslinked molecular structure. The tubing is formed by that polyethylene resin, antioxidant and stearic acid salt lubricant agents which are uniformly mixed according to certain proportion are used as raw materials, tubes are extruded through a tube extruding machine below temperature of 235 DEG C, and then the tubes are irradiated through electronic rays. The proportion of each component in the raw materials comprises: 98.5 to 99.0 wt% of the polyethylene resin, 0.1 to 0.6 wt% of the antioxidant and 0.5 to 1.0 wt% of the stearic acid salt lubricant agent, the crosslinked degree of molecules in the tubing is larger than or equal to 60%. The present invention provides crosslinked radiation polyethylene tubing which has the advantages of no need of adding crosslinking agents, low raw material cost, high extruding producing efficiency and high chemical purity of products.
Description
[technical field]
The present invention relates to a kind of polyvinyl piping materials, more particularly, the present invention relates to polyvinyl piping materials of a kind of cross-linked network molecular structure and preparation method thereof.
[background technology]
Polyethylene is a kind of polymer resin of linear macromolecule structure, in national economy, have very widely and use, but because its molecular structure is a line style, as making the tubing of convey materials, its molecular structure must be retrofited becomes solid netted corsslinking molecular structure under the occasion of some application.At present, the method for making cross-linking polyethylene materials and tubing thereof has chemical process as silane cross-linking method and peroxide crosslinking method, wherein:
Silane cross-linking method is to utilize the vinyl silanes that contains two keys under initiator (being generally superoxide) effect, react with the fused polyethylene, form silane grafted polymer, this polymkeric substance is in the presence of silanol condensation catalyst, meet water generation hydrolysis, thereby form solid netted siloxane bond crosslinking structure; The crosslinked with silicane technology need be added the additive of higher proportion, and the raw materials cost height also needs the hydrolytic crosslinking through 8 hours, the energy consumption height, and can not produce with traditional polyolefine extrusion equipment, need with being the custom-designed extrusion equipment of crosslinked with silicane, extruded velocity is lower, is about 8～10m/min.
Peroxide crosslinking is that the superoxide of sneaking in the polyethylene is decomposed into free radical in extrusion, cause vinyl polymer chain formation living radical and take place crosslinked, carry out in machine barrel for making crosslinking reaction, this Technology Need high pressure extrusion equipment, production rate is extremely low, have only 2m/min, efficient is low.
In addition, the method of making crosslinked polyethylene also has physical method such as radiation crosslinking method: this method is that the tubing that adopts rumbatron that polythene material or extruding are come out carries out radiation, make material internal polyethylene macromole under the effect of radiation energetic ray, produce free radical, intermolecular then free radical forms the C-C cross linked chain, is three-dimensional netted polymer crosslinking polyethylene and tubing thereof after crosslinked.
Above-mentioned each method is in the merits and demerits that realizes all having aspect general polythene material crosslinked separately, make aspect the polyvinyl piping materials all the more so.Therefore, more thorough for what crosslinking reaction was carried out in practice, often do not adopt a certain in the aforesaid method separately, but adopt above-mentioned two or three kind of method or two relevant or three kind of auxiliary agent simultaneously.And this process thought has formed a kind of set.
As application number is that 88105163.2 Chinese patent file discloses a kind of Pyrocondensated flat compound of radiation-crosslinked polythene that is used for oil field gathering and transportation steel corrosion-resistanting insulation pipe repaired mouth.As body material, each component shared weight percent in composition is this product with polyethylene and ethylene/vinyl acetate copolymer (EVA):
A) high density polyethylene(HDPE) (HDPE) 30～40%;
New LDPE (film grade) (LDPE) 40～60%;
Carbon black 1-5%;
Four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester 0.01-0.5%;
Whiteruss 1-5%;
B) vinyl/acetate multipolymer (EVA) accounts for 10-20%.
It is said that this product has favorable mechanical performance, environmental stress cracking resistance and resistance toheat.But this product is added with carbon black and vinyl/acetate multipolymer in raw material, and wherein, carbon black is except as the photomask agent, also as the sensitizing agent of polyethylene crosslinking to improve crosslinking degree; The vinyl/acetate multipolymer can improve the flexibility and the toughness of product.But certain crosslinking reaction can take place, produce the higher material of viscosity in the vinyl/acetate multipolymer and the carbon black material that add in squeezing the pipe process, produce retardation for crowded pipe speed, and the efficient of pipe is squeezed in influence; Carbon black also can reduce some application performance of pipe.
Also having application number is that 99110249.5 Chinese patent file discloses the manufacture method that a kind of radiation crosslinking is made foamed polyolefine plastic pipe.The polyethylene that this method adopts polyethylene and metallocene catalyst to produce, polypropylene, ethylene propylene copolymer, 100 parts of any two kinds of blends in ethylene vinyl acetate copolymer (EVA) a kind of and these resins wherein, press the product foam expansion and add compound foaming agent N, N '---dinitroso five methyne tetramines (DPT), 4,4---phenyl ether sulfonyl hydrazide (OBSH), Cellmic C 121 (AC), azoformic acid barium, 5～20 parts of any two kinds of blends in p-toluene sulfonylsemicarbazide a kind of and these whipping agents wherein, add activator zinc oxide, Zinc Stearate, trolamine, citric acid, phenylformic acid, 1～10 part in any two kinds of mixtures in hexanodioic acid a kind of and these activators wherein; Add oxidation inhibitor 2,6---di-t-butyl-4-cresols, four [(3-3,5-di-t-butyl 4-hydroxy phenyl) propionic acid] pentaerythritol ester, 1,-1,3---(2-methyl 4-hydroxyl one 5-tert-butyl-phenyl) butane, 2,2 '---0.1～1 part in any two kinds of mixtures in methylene-bis (4-methyl-6-t-butyl phenol) a kind of and these oxidation inhibitor wherein; Nucleator zinc oxide, lime carbonate, barium carbonate, chromium carbonate, 1～15 part in any two kinds of mixtures in silicon-dioxide a kind of and these nucleators wherein, sensitization linking agent Ethylene glycol dimethacrylate, trimethylammonium vinylformic acid glyceryl ester, methylene-succinic acid two propylene esters, equisetic acid three propylene esters, cyanuric acid three propylene esters, 1～5 part of toluylene a kind of 0.5～15 part and processing aid barium stearate wherein, mixing in homogenizer, again with driving refining or Banbury mixer, mixing granulator under the temperature that is higher than 10～20 ℃ of melting point resin temperature is again with being lower than extruding pipe material under the foaming agent decomposition temperature on the forcing machine; With tubing irradiation in cobalt source or rumbatron, irradiation dose is 0.5～10Mrad, and the tubing that irradiation is good foams in vertical foaming furnace, blowing temperature be 180 ℃ to 210 ℃, make foamed polyolefine plastic pipe.This method in raw material except that being added with whipping agent, oxidation inhibitor, also adding has auxiliary agents such as sensitization linking agent, nucleator, activator, and composition, reaction and operation are all complicated, squeeze in the pipe process and also can produce the higher material of viscosity, the efficient of pipe is squeezed in influence, but also has limited the range of application of pipe.
Above-mentioned technology all has a common drawback: both adopted radiation crosslinking equipment, and adopted the auxiliary agent and the equipment of chemically crosslinked again, cost of investment is too high, and running cost is also very high.
[summary of the invention]
At the above-mentioned shortcoming of prior art, the technical purpose that the present invention will reach is will provide a kind of need not add linking agent, and raw materials cost is low, extrudes the production efficiency height, the radiant crosslinked polyethylene tubing of the chemical high purity of product.
Another technical purpose that the present invention will reach is that a kind of processing method of producing the above-mentioned radiant crosslinked polyethylene tubing of preparation will be provided.
For this reason, technical scheme of the present invention is a kind of radiant crosslinked polyethylene tubing, this finished product tubing has network molecular structure crosslinked on three-dimensional, and this tubing is that polyvinyl resin, antioxidant and hard acid ester salt series lubricant agent with a certain proportion of mixing is raw material, is squeezed into pipe by tube extruding machine in temperature below 235 ℃, and then radiation obtains through electron rays; The ratio of each component is in the described raw material: polyvinyl resin 98.5～99.0%wt, antioxidant 0.1～0.6%wt, hard acid ester salt series lubricant agent 0.5～1.0%wt; Molecule crosslinked degree 〉=60% of described tubing inside.The present invention only adopts two kinds of auxiliary agents to produce polyvinyl piping materials, wherein only comprises the lubricant as processing aid, as the antioxidant of modified additive.Like this, the least possible auxiliary agent can make the chemical pure cleanliness in the production tube material improve greatly, make tubing can be widely used in various health or the demanding occasion of clean level as the drinking water pipeline of carrying cold/hot water, milk processing/transport pipe etc., certain also can be used for hygienic requirements not high as petroleum transportation pipeline etc.In addition, employing two kinds of turndown ratiies that auxiliary agent can obtain more to strengthen seldom; The more important thing is, tubing of the present invention is strengthened the molecular structure of cross-linked material fully by means of appropriate method of radiating, before squeezing pipe, do not add linking agent in the raw material, thereby avoided fully in the crowded pipe process that heats up, when temperature is brought up to 200～300 ℃ of scopes, contingent crosslinking reaction in the mixture; Heating up to squeeze in the pipe process can not produce full-bodied material, and crowded tube efficiency is significantly brought up to 15～30m/min scope.The extruded velocity of product of the present invention improves 1～2 times than the extruded velocity of silane cross-linking method, and need not to add expensive auxiliary agent; Improve about tens times than peroxide crosslinking method extruded velocity, and saved the high pressure extrusion equipment; Tubing of the present invention is also easier, efficient than traditional radiation crosslinking tube squeeze tubing, needn't several different methods, many complete equipments go up together and add fixed cost and process cost suddenly, and can reach same effect.Prove after tested, molecule crosslinked degree 〉=60% of tubing of the present invention, tensile yield strength 〉=17MPa, elongation at break 〉=400%, test 1000 hours ne-leakage crack-frees under hydrostatic tension 4.4MPa, 95 ℃ of conditions, test 8760 hours ne-leakage crack-frees under hydrostatic tension 2.5MPa, 1110 ℃ of conditions, longitudinal length relaxation shrinkage≤3%, use temperature is-40～110 ℃; Tubing of the present invention can be used as cold and hot water with pipe, has chemical high purity, long service life, reliable thermotolerance and characteristics such as winter hardiness, erosion resistance and snappiness are good, easy construction.
For improving the tubing physicals, increase and squeeze the pipe operation efficiency, the present invention controls following technical indicator: in the described polyvinyl resin, the ratio of high density polyethylene(HDPE) is 70～100%wt, and the ratio of LLDPE is 0～30%wt.Melting index≤the 0.5g/10min of described high density polyethylene(HDPE), the melting index≤1.0g/10min of described LLDPE.In the described antioxidant, the weight of phenol antioxidant is 1～3 times of weight of phosphorous acid esters antioxidant.Described phenol antioxidant is β-propanedioic acid stearyl (antioxidant 1076) and/or pentaerythritol tetrathioglycollate (antioxidant 1010), and described phosphorous acid esters antioxidant is three (2, the 4-di-tert-butyl-phenyl) phosphorous acid esters (oxidation inhibitor 168); Described lubricant is the hard acid ester salt of divalence and/or trivalent metal ion.
Correspondingly, another technical scheme of the present invention is the method for the above-mentioned polyvinyl piping materials of preparation, and this method comprises the steps:
A) antioxidant, hard acid ester salt series lubricant agent and three kinds of raw materials of polyvinyl resin are joined in the high-speed mixer mix, the ratio of described three kinds of raw materials is: polyvinyl resin 98.5～99.0%wt, antioxidant 0.1～0.6%wt, hard acid ester salt series lubricant agent 0.5～1.0%wt;
B) under the condition of heating, above-mentioned mixing material is squeezed into pipe by tube extruding machine;
C) adopt electron rays radiation aforementioned tubes to obtain the finished product tubing of molecule crosslinked degree 〉=60%.
Preparation method of the present invention only adopts two kinds of auxiliary agents to mix with polyvinyl resin and produces tubing, before squeezing pipe, do not add linking agent in the raw material, thereby can avoid fully in crowded pipe process, when crowded pipe temperature is brought up to 200～300 ℃, contingent crosslinking reaction and issuable high-viscosity material in the mixture, thus make crowded tube efficiency significantly improve the crowded pipe turndown ratio that can also obtain more to strengthen; Chemical pure cleanliness in the finished product tubing improves greatly simultaneously, can make finished product tubing be widely used in the very high application scenario of various requirement.Behind extruding pipe material efficiently, realize the crosslinked enhancement purpose of molecular structure more fully by suitable method of radiating, improve 1～2 times than the extruded velocity of silane cross-linking method, and need not to add expensive auxiliary agent; Improve about tens times than peroxide crosslinking method extruded velocity, and saved the high pressure extrusion equipment; Preparation of pipes method of the present invention is easier, efficient than traditional radiation crosslinking tube squeeze, and equipment fixed investment cost and process cost all decline to a great extent.
For realizing above-mentioned basic method steps, realize the high crosslinking degree of molecular structure, very crucial is in described step C, the quantity of radiant energy of described electron rays is controlled at 2.5～3.0MeV, radiation streaming density is 10～40mA, and unit mass tubing is 10～120KGy to the radiating absorption dose.
Correspondingly, in described steps A, the rotating speed of high-speed mixer is controlled at 750～1500r/min, and mixing temperature is controlled in 20～40 ℃ of scopes.In the crowded pipe process of described step B, control described mixing material temperature in 160～230 ℃ of scopes.Among the described step B, the extruded velocity of tubing is controlled in 15～30m/min scope.
In a word, tubing of the present invention and preparation method thereof all have be easy to implement, advantage efficient, with low cost.
Below, in conjunction with specific embodiments technical solution of the present invention is described further.
[embodiment]
Embodiment 1
The embodiment of preparation diameter D16mm, wall thickness 2.0mm polyvinyl piping materials, commercially available following compounds high density polyethylene(HDPE) (HDPE) 75Kg, LLDPE (LLDPE) 24Kg, oxidation inhibitor (1010) 0.05Kg, oxidation inhibitor (168) 0.05Kg, barium stearate 0.9Kg in high-speed mixer, are mixed with rotating speed 1200r/min under the room temperature.Said mixture is extruded into tubulose under 220 ℃ of temperature, through gamma-rays or electron rays radiation, radiation dose is 110KGy, makes linear macromolecular material change three-dimensional netted crosslinked macromolecular material into.Described radiant crosslinked polyethylene pipe performance is tested, the result is as follows: degree of crosslinking: 〉=60%, tensile yield strength 〉=17MPa, elongation at break 〉=400%, test 1000 hours ne-leakage crack-frees under hydrostatic tension 4.4MPa, 95 ℃ of conditions, test 8760 hours ne-leakage crack-frees under hydrostatic tension 2.5MPa, 110 ℃ of conditions, longitudinal length relaxation shrinkage≤3%, use temperature is-40～110 ℃.
Embodiment 2
The embodiment of preparation D20mm, wall thickness 2.0mm polyvinyl piping materials, commercially available following compounds high density polyethylene(HDPE) (HDPE) 90Kg, LLDPE (LLDPE) 9Kg, oxidation inhibitor (1010) 0.1Kg, oxidation inhibitor (168) 0.2Kg, Zinic stearas 0.7Kg in high-speed mixer, are mixed with rotating speed 1000r/min under the room temperature.Said mixture is extruded into tubulose under 195 ℃ of temperature, through gamma-rays or electron rays radiation, radiation dose is 85KGy, makes linear macromolecular material change three-dimensional netted crosslinked macromolecular material into.Described radiant crosslinked polyethylene pipe performance is carried out above-mentioned test, up to standard.
Embodiment 3
The embodiment of preparation D18mm, wall thickness 2.0mm polyvinyl piping materials, commercially available following compounds high density polyethylene(HDPE) (HDPE) 80Kg, LLDPE (LLDPE) 18.5Kg, oxidation inhibitor (1010) 0.2Kg, oxidation inhibitor (168) 0.3Kg, Zinic stearas 1.0Kg in high-speed mixer, are mixed with rotating speed 900r/min under the room temperature.Said mixture is extruded into tubulose under 185 ℃ of temperature, through gamma-rays or electron rays radiation, radiation dose is 100KGy, makes linear macromolecular material change three-dimensional netted crosslinked macromolecular material into.Described radiant crosslinked polyethylene pipe performance is carried out above-mentioned test, up to standard.
Claims (10)
1, a kind of radiant crosslinked polyethylene tubing, this tubing has solid netted crosslinked molecular structure, it is characterized in that: described tubing is that polyvinyl resin, antioxidant and the hard acid ester salt series lubricant agent with a certain proportion of mixing is raw material, is squeezed into pipe by tube extruding machine in temperature below 235 ℃, and then radiation obtains through electron rays; The ratio of each component is in the described raw material: polyvinyl resin 98.5～99.0%wt, antioxidant 0.1～0.6%wt, hard acid ester salt series lubricant agent 0.5～1.0%wt; Molecule crosslinked degree 〉=60% of described molecular structure.
2, radiant crosslinked polyethylene tubing as claimed in claim 1 is characterized in that: in the described polyvinyl resin, the ratio of high density polyethylene(HDPE) is 70～100%wt, and the ratio of LLDPE is 0～30%wt.
3, radiant crosslinked polyethylene tubing as claimed in claim 1 or 2 is characterized in that: the melting index≤0.5g/10min of described high density polyethylene(HDPE), the melting index≤1.0g/10min of described LLDPE.
4, radiant crosslinked polyethylene tubing as claimed in claim 1 or 2 is characterized in that: in the described antioxidant, the weight of phenol antioxidant is 1～3 times of weight of phosphorous acid esters antioxidant.
5, radiant crosslinked polyethylene tubing as claimed in claim 4, it is characterized in that: described phenol antioxidant is β-propanedioic acid stearyl and/or pentaerythritol tetrathioglycollate, described phosphorous acid esters antioxidant is three (2, the 4-di-tert-butyl-phenyl) phosphorous acid ester; Described lubricant is the hard acid ester salt of divalence and/or trivalent metal ion.
6, a kind of preparation is as the method for polyvinyl piping materials as described in one of claim 1～5, and it is characterized in that: described method comprises the steps:
A) antioxidant, hard acid ester salt series lubricant agent and three kinds of raw materials of polyvinyl resin are joined in the high-speed mixer mix, the ratio of described three kinds of raw materials is: polyvinyl resin 98.5～99.0%wt, antioxidant 0.1～0.6%wt, hard acid ester salt series lubricant agent 0.5～1.0%wt;
B) under the condition of heating, above-mentioned mixing material is squeezed into pipe by tube extruding machine;
C) adopt electron rays radiation aforementioned tubes to obtain the finished product tubing of molecule crosslinked degree 〉=60%.
7, the method for preparing polyvinyl piping materials as claimed in claim 6, it is characterized in that: among the described step C, the quantity of radiant energy of described electron rays is controlled at 2.5～3.0MeV, and radiation streaming density is 10～40mA, and unit mass tubing is 10～120KGy to the radiating absorption dose.
8, as claim 6 or the 7 described methods that prepare polyvinyl piping materials, it is characterized in that: in the described steps A, the rotating speed of high-speed mixer is controlled at 750～1500r/min, and mixing temperature is controlled in 20～40 ℃ of scopes.
9, as claim 6 or the 7 described methods that prepare polyvinyl piping materials, it is characterized in that: in the crowded pipe process of described step B, control described mixing material temperature in 160～230 ℃ of scopes.
10, as claim 6 or the 7 described methods that prepare polyvinyl piping materials, it is characterized in that: among the described step B, the extruded velocity of tubing is controlled in 15～30m/min scope.
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| CN 200410026533 CN1282699C (en) | 2004-03-19 | 2004-03-19 | Radiation crosslinked polyethylene pipe and its preparation method |
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| CN 200410026533 CN1282699C (en) | 2004-03-19 | 2004-03-19 | Radiation crosslinked polyethylene pipe and its preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102109070B (en) * | 2009-12-24 | 2013-03-27 | 黑龙江省科学院技术物理研究所 | Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method |
| CN102434726B (en) * | 2011-08-31 | 2014-03-12 | 佛山佛塑科技集团股份有限公司 | Water supply pipe material and preparation method thereof |
| CN103214712B (en) * | 2013-03-26 | 2015-09-09 | 安徽双荣电器电缆有限公司 | A kind of Cold-tolerant polyethylene cable material and preparation method thereof |
| CN103395182A (en) * | 2013-07-04 | 2013-11-20 | 河南联塑实业有限公司 | PE (polyethylene)100-RC pipe with high slow crack growth resistance and preparation method thereof |
| CN106678498A (en) * | 2016-07-26 | 2017-05-17 | 潍坊中石科技有限公司 | Manufacturing technique of wrapping cross-linking corrosion-resistant layer of metal pipeline |
| CN106589517B (en) * | 2016-10-21 | 2019-07-23 | 四川大学 | A kind of bridge cable casing and preparation method thereof |
| CN113074283A (en) * | 2021-03-15 | 2021-07-06 | 广东联塑科技实业有限公司 | Heat-resistant steel wire mesh framework PE composite pipe and preparation method and application thereof |
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