CN101696752A - Polyolefin PP/PVDC/polyolefin PE multilayer compounded tube - Google Patents
Polyolefin PP/PVDC/polyolefin PE multilayer compounded tube Download PDFInfo
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- CN101696752A CN101696752A CN200910066284A CN200910066284A CN101696752A CN 101696752 A CN101696752 A CN 101696752A CN 200910066284 A CN200910066284 A CN 200910066284A CN 200910066284 A CN200910066284 A CN 200910066284A CN 101696752 A CN101696752 A CN 101696752A
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Abstract
The invention relates to a polyolefin PP/PVDC/polyolefin PE multilayer compounded tube, effectively solving the problems that plastic tubes have the defects of toxity, low strength, weak toughness, weak impact resistance, high cost and complicated processing. The method comprises the following steps: respectively extruding a polyolefin PP outer layer, a PVDC intermediate layer and a polyolefin PE inner layer by an extruder and then heating, extruding a compounded tube by the same extruding port mould, wherein the compounded tube is formed by co-extruding a plurality of layers and has tightly combined adjacent layers and at least comprises the polyolefin PP outer layer the PVDC intermediate layer and the polyolefin PE inner layer, and sectionally heating the polyolefin PP outer layer and the polyolefin PE inner layer in a machine barrel zone and a die head zone of the extruder; sectionally heating the PVDC intermediate layer in the machine barrel zone and the die head zone; and carrying out vacuum sizing on the combined compounded tube, placing the sized compounded tube in water at 18-23 DEG C for secondary cooling, and printing, drawing and cutting the product in sizing to obtain the polyolefin PP/PVDC/polyolefin PE multilayer compounded tube. The polyolefin PP/PVDC/polyolefin PE multilayer compounded tube has no toxicity and side effects, high cost performance, simple processing, high strength, favorable toughness and strong impact resistance and is an innovation on the tubes.
Description
One, technical field
The present invention relates to tubing, particularly a kind of polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe.
Two, background technique
Pipeline is widely used in the conveying of various fluids, as each class I liquid I, gas etc.Domestic and international at present plastic tube as water supply usefulness, its raw materials mainly adopt fluoropolymer resins such as PE, PP, PVC and ABS, but owing to manufacture cost, cost of material, the market demand, especially each side factor such as large-caliber water supply tubing, the source is abundant, bigger, cheap PVC (mainly the being hard) resin of output is still the leading raw material on the market.Because the polyvinyl chloride resin self performance becomes in the manufacturing process of tubing in machine shaping, must add auxiliary agents such as corresponding stabilizer, modifier, processing aid.And present most of enterprise produces and contains heavy metal in the required stabilizer of pvc pipe material, the effect of heavy metal and polyvinyl chloride resin material in course of working along with time and temperature variation and separate out when VCM is arranged, both factors make the PVC hard tube of being produced that certain toxicity be arranged, therefore NBS has been made concrete regulation to the content of heavy metal in the tubing and the content of separating out of VCM, be regarded as harmlessly, its product just allows to produce.If its index does not reach the national Specification value, then be considered as harmful human body, its product is defective, forbids producing.Along with economic development, the progress of society and the raising day by day of living standards of the people, people are more and more higher to the requirement of aspects such as quality of life and safe and sanitary, although the pvc pipe material can be used as supply pipe, but it contains microtoxicity is objective reality, and people get up to its microtoxicity problem also pay attention to day by day.Shock compatriots' Sanlu milk powder case let us is inspired deeply: everything relates to having not a particle of of personal safety is minor issue, the no minor matter of safety.Can go into overdrive aspect quality testing, safe and sanitary, the disease quarantine after the country, and progressively eliminate the potential risk product.PVC hides plumbous killer, country is limited in the potable water tubing and uses, but PVC plastic water pipe, PVC door-window section bar material, PVC ceiling material just are used for modern architecture and house decoration more and more, however the health that this light and handy material attractive in appearance but may threaten you.Plumbous in the PVC plastics mainly from wherein heat stabilizer lead salt.The expert discovers that the channel that lead pollution enters human body mainly contains two, the one, suck by respiratory tract by the air that pollutes; The 2nd, enter by mouth by food and drinking-water.Current research finds, the PVC plastic water supply pipe that contains lead salt in use, heavy metal lead can be separated out from pipeline, directly causes the pollution of potable water.If leaded plastics water supply pipe has been used in family, kindergarten or sub-district, can directly cause the potable water lead pollution.The a lot of countries in the world all prohibite and use the stabilizer that contains lead salt and CPE modifier etc.In addition, in big snow disaster in 2008 and terrorise's 512 violent earthquakes, national plastic pipe association statistical result showed, damaging maximum in whole pipe network system is exactly the PVC-U pipe part.The earthquake region pipe network is subjected to heavy damage (seismic intensity is especially greatly a main cause certainly), this will will consider that afterwards the factor of geology harm is interior during the Development and Production new product as far as possible with regard to the pipeline industry, improve the resistance of tubing to geological disaster as far as possible, the tubing of performances such as exploitation high strength, high tenacity, high impact-resistant has become the new trend of pipeline industry development.Simultaneously in the rural safe drinking water engineering, especially fall behind, remote rural area because with a varied topography, execution conditions are abominable, situations such as knocking, bump, press, pound, fall, roll is inevitable, this has just more required the quality of tubing.As the heavy caliber pipe that potable water uses, replacing traditional metallic conduit with plastic tube is trend of the times, the demand of social development.Though but excellent combination properties such as some engineering plastics such as PA, PEEK, ABS can be used for making plastic tube, it costs an arm and a leg, processing conditions is had relatively high expectations, the level of incompatibility Economic Development, so improve and innovate imperative.
Three, summary of the invention
At above-mentioned situation, for overcoming the prior art defective, the present invention's purpose just provides a kind of polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe, it is toxic effectively to solve plastic tube, intensity is low, poor toughness, a little less than the impact resistance, the cost height, the problem of processed complex, the technological scheme of its solution is, with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, be extruded into rare polyolefin PP skin by same extrusion neck ring mold again, PVDC mesosphere and polyolefin PE internal layer multi-layer co-extruded, the composite pipe of adjacent layer combination closely (seeing shown in Figure 2), wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section (or district, as follows) temperature is: 1 section is 170 ± 5 ℃, 2 sections is 175 ± 5 ℃, 3 sections is 185 ± 5 ℃, 4 sections is 185 ± 5 ℃, extruder die head (or head, as follows) district die head length be divided into 7 sections, every section temperature is: 1 section is 190 ± 10 ℃, and 2 sections is 185 ± 5 ℃, and 3 sections is 185 ± 5 ℃, 4 sections is 190 ± 5 ℃, 5 sections is 200 ± 10 ℃, and 6 sections is 200 ± 10 ℃, and 7 sections is 205 ± 10 ℃, the extruder rotating speed is 40-120rad/min, and hauling speed is 350-900cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 165 ± 5 ℃, and 2 sections is 175 ± 5 ℃, and 3 sections is 185 ± 5 ℃, 4 sections is 180 ± 5 ℃, the die head length of extruder die Head Section is divided into 4 sections, and every section temperature is: 1 section is 195 ± 10 ℃, and 2 sections is 185 ± 5 ℃, 3 sections is 180 ± 5 ℃, 4 sections is 165 ± 5 ℃, and the extruder rotating speed is 40-120rad/min, and hauling speed is 300-800cm/min; Polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.3~0.5: 1, and the outer field density of polyolefin PP is 0.895~0.91g/cm
3, the density of polyolefin PE internal layer is 0.93~0.956g/cm
3, the density in PVDC mesosphere is 1.8-1.96g/cm
3, in conjunction with after composite pipe in the vacuum of 0.015-0.04MPa, after water temperature is 20-25 ℃ of following sizing, place 18-23 ℃ water to carry out the secondary cooling again, product is printed, traction, the scale cutting tubing of the present invention, after Checking of finished products is qualified, packing, warehouse-in; Said polyolefin PP skin is mixed for 3~8 parts by by weight PP-R 90-110 part (PP-R can adopt Korea S star R200P dawn product), 1~4 part of colorant and plasticizer and is crushed to; Said PVDC mesosphere is mixed for 3~10 parts by by weight PVDC resin 90-100 part, 4~8 parts of stabilizers, 0.2~0.5 part of oiling agent and processing aid and is crushed to; Said polyolefin PE internal layer is mixed for 1~4 part and is crushed to by PE resin 90-100 part, colorant by weight; Said colorant is the color masterbatch of the grey or the white of Cabot board; Said plasticizer is the maleic anhydride graft phase solvent, any as in POE plasticizer, EVA plasticizer, SBS plasticizer, EPDM plasticizer, PE plasticizer, the ABS plasticizer; Said stabilizer is any in lead sulfate tribasic, zine stearate, the barium stearate; Said oiling agent is any in paraffin, PE wax, the OPE wax; Said processing aid is processing aid ACR201 (for the graft copolymer of methyl methacrylate and acrylate), or processing aid ACR401 (being methyl methacrylate, ethyl acrylate, butyl acrylate and four kinds of monomer copolymerizations of vinyl benzene), or processing aid AMS (oligomer of AMS), when said composite pipe is a multilayer more than 3 layers, except that internal layer, other is the two-layer compoiste adhering that upwards replaces and is crushed to together.The present invention has no side effect, and cost performance is good, and processing is simple, the intensity height, and good toughness, impact resistance are strong, are the innovations on the tubing.
Four, description of drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is product structure sectional drawing of the present invention (three layers, wherein, the 1st, polyolefin PP skin, the 2nd, PVDC mesosphere, the 3rd, polyolefin PE internal layer).
Five, embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
Embodiment 1: with 3 layers shown in Figure 2 be example, by shown in Figure 1,
The present invention in the specific implementation, with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, extrude skin by same extrusion neck ring mold again by polyolefin PP, 3 layers of co-extrusion of PVDC mesosphere and polyolefin PE internal layer, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, and every section temperature is: 1 section is 167 ℃, and 2 sections is 172 ℃, 3 sections is 182 ℃, 4 sections is 182 ℃, and the die head length of extruder die Head Section is divided into 7 sections, and every section temperature is: 1 section is 185 ℃, 2 sections is 182 ℃, 3 sections is 182 ℃, and 4 sections is 187 ℃, and 5 sections is 192 ℃, 6 sections is 195 ℃, 7 sections is 200 ℃, and the extruder rotating speed is 50rad/min, and hauling speed is 400cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 162 ℃, 2 sections is 172 ℃, 3 sections is 182 ℃, 4 sections is 177 ℃, the die head length of extruder die Head Section is divided into 4 sections, every section temperature is: 1 section is 190 ℃, 2 sections is 182 ℃, and 3 sections is 177 ℃, and 4 sections is 163 ℃, the extruder rotating speed is 50rad/min, hauling speed is 400cm/min, polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.3: 1, and the outer field density of polyolefin PP is 0.896g/cm
3, the density of polyolefin PE internal layer is 0.935g/cm
3, the density in PVDC mesosphere is 1.83g/cm
3, in conjunction with after composite pipe in the vacuum of 0.02Mpa, after water temperature is 21 ℃ of following sizings, place 19 ℃ water to carry out the secondary cooling again, product is printed, traction, the scale cutting tubing of the present invention, after Checking of finished products is qualified, packing, warehouse-in; Said polyolefin PP skin is mixed for 4 parts by 2 parts of the grey color masterbatches of 95 parts of by weight Korea S star R200P dawn, Cabot board and POE plasticizer and is crushed to; Said PVDC mesosphere is mixed for 4 parts by by weight 0.3 part in 5 parts of 95 parts of PVDC resins, lead sulfate tribasics, paraffin and processing aid ACR201 and is crushed to; Said polyolefin PE internal layer is mixed for 2 parts by the grey color masterbatch of by weight 95 parts of PE resins, Cabot board and is crushed to.
Embodiment 2:
The present invention is also with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, extrude skin by same extrusion neck ring mold again by polyolefin PP, 3 layers of co-extrusion of PVDC mesosphere and polyolefin PE internal layer, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section temperature is: 1 section is 169 ℃, 2 sections is 176 ℃, and 3 sections is 185 ℃, and 4 sections is 185 ℃, the die head length of extruder die Head Section is divided into 7 sections, every section temperature is: 1 section is 190 ℃, and 2 sections is 185 ℃, and 3 sections is 185 ℃, 4 sections is 189 ℃, 5 sections is 200 ℃, and 6 sections is 200 ℃, and 7 sections is 210 ℃, the extruder rotating speed is 80rad/min, and hauling speed is 600cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 165 ℃, and 2 sections is 175 ℃, and 3 sections is 186 ℃, 4 sections is 180 ℃, the die head length of extruder die Head Section is divided into 4 sections, and every section temperature is: 1 section is 200 ℃, and 2 sections is 186 ℃, 3 sections is 180 ℃, 4 sections is 165 ℃, and the extruder rotating speed is 85rad/min, and hauling speed is 550cm/min; Polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.4: 1, and the outer field density of polyolefin PP is 0.898g/cm
3, the density of polyolefin PE internal layer is 0.945g/cm
3, the density in PVDC mesosphere is 1.9g/cm
3, in conjunction with after composite pipe in the vacuum of 0.03Mpa, after water temperature is 23 ℃ of following sizings, place 21 ℃ water to carry out the secondary cooling again, product is printed, traction, the scale cutting tubing of the present invention, after Checking of finished products is qualified, packing, warehouse-in; Said polyolefin PP skin is mixed for 5 parts by 3 parts of the white color masterbatches of by weight Korea S star R200P100 dawn part, Cabot board and EVA plasticizer and is crushed to; Said PVDC mesosphere is mixed by by weight 0.4 part in 6 parts of 97 parts of PVDC resins, zine stearates, PE wax and processing aid ACR4016 part and is crushed to; Said polyolefin PE internal layer is mixed for 3 parts by the white color masterbatch of by weight 97 parts of PE resins, Cabot board and is crushed to.
Embodiment 3:
The present invention is also with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, extrude skin by same extrusion neck ring mold again by polyolefin PP, 3 layers of co-extrusion of PVDC mesosphere and polyolefin PE internal layer, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section temperature is: 1 section is 172 ℃, 2 sections is 179 ℃, and 3 sections is 189 ℃, and 4 sections is 189 ℃, the die head length of extruder die Head Section is divided into 7 sections, every section temperature is: 1 section is 198 ℃, and 2 sections is 189 ℃, and 3 sections is 189 ℃, 4 sections is 193 ℃, 5 sections is 205 ℃, and 6 sections is 207 ℃, and 7 sections is 213 ℃, the extruder rotating speed is 115rad/min, and hauling speed is 850cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 169 ℃, and 2 sections is 179 ℃, and 3 sections is 189 ℃, 4 sections is 183 ℃, the die head length of extruder die Head Section is divided into 4 sections, and every section temperature is: 1 section is 203 ℃, and 2 sections is 189 ℃, 3 sections is 183 ℃, 4 sections is 169 ℃, and the extruder rotating speed is 110rad/min, and hauling speed is 750cm/min; Polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.5: 1, and the outer field density of polyolefin PP is 0.9g/cm
3, the density of polyolefin PE internal layer is 0.955g/cm
3, the density in PVDC mesosphere is 1.95g/cm
3, in conjunction with after composite pipe in the vacuum of 0.035MPa, after water temperature is 24 ℃ of following sizings, place 22 ℃ water to carry out the secondary cooling again, product is printed, traction, the scale cutting tubing of the present invention, after Checking of finished products is qualified, packing, warehouse-in; Said polyolefin PP skin is mixed for 7 parts by 4 parts of the color masterbatches of the white of 105 parts of by weight Korea S star R200P dawn, Cabot board and EPDM plasticizer and is crushed to; Said PVDC mesosphere is mixed for 9 parts by by weight 0.5 part in 7 parts of 98 parts of PVDC resins, barium stearates, OPE wax and processing aid AMS and is crushed to; Said polyolefin PE internal layer is mixed for 4 parts by the color masterbatch of the white of by weight 98 parts of PE resins, Cabot board and is crushed to.
The relevant process parameter of the present invention is provided by following table:
Polyolefin layer:
The PVDC layer:
Polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe of the present invention is to be processed by multi-layer co-extruded method, adjacent layer is combined closely, it is characterized by multilayer tubing is solid wall pipe, be respectively from inside to outside: nontoxic, odorless and corrosion-resistant, intensity, rigidity is polyolefin PE internal layer preferably all, the barrier height, strong and the low-temperature heat-sealing of toughness, the PVDC mesosphere that thermal shrinkage and chemical stability are good, nontoxic, tasteless, odorless, has good heat resistance and winter hardiness, chemical stability is good, also has the smooth polyolefin PP skin of higher rigidity and toughness and tube wall, these polymeric layers of polyolefin PP/PVDC/ polyolefin PE are combined with each other and can give full play to the excellent properties of various materials and remedy its shortcoming, improve the quality of products, the present invention efficiently solves the toxic of supplying drinking water pipeline, problems such as the life-span is short, and cheap excellent performance, has the good processibility of extruding, reduced cost, avoided secondary pollution, can be widely used in the transformation of the network of rivers, rural area, municipal engineering are supplied water, the medicine safe and sanitary, industry such as food manufacturing and packing, and processing is simple, the intensity height, good toughness, impact resistance is strong, and economic and social benefit is remarkable.
Claims (9)
1. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe, it is characterized in that, with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, be extruded into rare polyolefin PP skin by same extrusion neck ring mold again, PVDC mesosphere and polyolefin PE internal layer multi-layer co-extruded, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section temperature is: 1 section is 170 ± 5 ℃, 2 sections is 175 ± 5 ℃, and 3 sections is 185 ± 5 ℃, and 4 sections is 185 ± 5 ℃, the die head length of extruder die Head Section is divided into 7 sections, every section temperature is: 1 section is 190 ± 10 ℃, and 2 sections is 185 ± 5 ℃, and 3 sections is 185 ± 5 ℃, 4 sections is 190 ± 5 ℃, 5 sections is 200 ± 10 ℃, and 6 sections is 200 ± 10 ℃, and 7 sections is 205 ± 10 ℃, the extruder rotating speed is 40-120rad/min, and hauling speed is 350-900cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 165 ± 5 ℃, and 2 sections is 175 ± 5 ℃, and 3 sections is 185 ± 5 ℃, 4 sections is 180 ± 5 ℃, the die head length of extruder die Head Section is divided into 4 sections, and every section temperature is: 1 section is 195 ± 10 ℃, and 2 sections is 185 ± 5 ℃, 3 sections is 180 ± 5 ℃, 4 sections is 165 ± 5 ℃, and the extruder rotating speed is 40-120rad/min, and hauling speed is 300-800cm/min; Polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.3~0.5: 1, and the outer field density of polyolefin PP is 0.895~0.91g/cm
3, the density of polyolefin PE internal layer is 0.93~0.956g/cm
3, the density in PVDC mesosphere is 1.8-1.96g/cm
3In conjunction with after composite pipe in the vacuum of 0.015-0.04MPa, after water temperature is 20-25 ℃ of following sizing, place 18-23 ℃ water to carry out the secondary cooling again, product is printed, traction, scale cutting tubing of the present invention, said polyolefin PP skin is mixed for 3~8 parts by by weight 1~4 part of PP-R 90-110 part, colorant and plasticizer and is crushed to; Said PVDC mesosphere is mixed for 3~10 parts by by weight PVDC resin 90-100 part, 4~8 parts of stabilizers, 0.2~0.5 part of oiling agent and processing aid and is crushed to; Said polyolefin PE internal layer is mixed for 1~4 part and is crushed to by PE resin 90-100 part, colorant by weight.
2. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1 is characterized in that, said colorant is the color masterbatch of the grey or the white of Cabot board.
3. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1, it is characterized in that, said plasticizer is the maleic anhydride graft phase solvent, any as in POE plasticizer, EVA plasticizer, SBS plasticizer, EPDM plasticizer, PE plasticizer, the ABS plasticizer.
4. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1 is characterized in that, said stabilizer is any in lead sulfate tribasic, zine stearate, the barium stearate.
5. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1 is characterized in that, said oiling agent is any in paraffin, PE wax, the OPE wax.
6. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1 is characterized in that said processing aid is processing aid ACR201, or processing aid ACR401, or processing aid AMS.
7. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1, it is characterized in that, with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, extrude skin by same extrusion neck ring mold again by polyolefin PP, 3 layers of co-extrusion of PVDC mesosphere and polyolefin PE internal layer, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section temperature is: 1 section is 167 ℃, 2 sections is 172 ℃, and 3 sections is 182 ℃, and 4 sections is 182 ℃, the die head length of extruder die Head Section is divided into 7 sections, every section temperature is: 1 section is 185 ℃, and 2 sections is 182 ℃, and 3 sections is 182 ℃, 4 sections is 187 ℃, 5 sections is 192 ℃, and 6 sections is 195 ℃, and 7 sections is 200 ℃, the extruder rotating speed is 50rad/min, and hauling speed is 400cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 162 ℃, 2 sections is 172 ℃, 3 sections is 182 ℃, 4 sections is 177 ℃, the die head length of extruder die Head Section is divided into 4 sections, every section temperature is: 1 section is 190 ℃, 2 sections is 182 ℃, and 3 sections is 177 ℃, and 4 sections is 163 ℃, the extruder rotating speed is 50rad/min, hauling speed is 400cm/min, polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.3: 1, and the outer field density of polyolefin PP is 0.896g/cm
3, the density of polyolefin PE internal layer is 0.935g/cm
3, the density in PVDC mesosphere is 1.83g/cm
3In conjunction with after composite pipe in the vacuum of 0.02Mpa, after water temperature is 21 ℃ of following sizings, place 19 ℃ water to carry out the secondary cooling again, product is printed, traction, scale cutting tubing of the present invention, said polyolefin PP skin is mixed for 4 parts by 2 parts of the grey color masterbatches of by weight 95 parts of Korea S star R200P dawn, Cabot board and POE plasticizer and is crushed to; Said PVDC mesosphere is mixed by by weight 0.3 part in 5 parts of 95 parts of PVDC resins, lead sulfate tribasics, paraffin and processing aid ACR2014 part and is crushed to; Said polyolefin PE internal layer is mixed for 2 parts by the grey color masterbatch of by weight 95 parts of PE resins, Cabot board and is crushed to.
8. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1, it is characterized in that, with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, extrude skin by same extrusion neck ring mold again by polyolefin PP, 3 layers of co-extrusion of PVDC mesosphere and polyolefin PE internal layer, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section temperature is: 1 section is 169 ℃, 2 sections is 176 ℃, and 3 sections is 185 ℃, and 4 sections is 185 ℃, the die head length of extruder die Head Section is divided into 7 sections, every section temperature is: 1 section is 190 ℃, and 2 sections is 185 ℃, and 3 sections is 185 ℃, 4 sections is 189 ℃, 5 sections is 200 ℃, and 6 sections is 200 ℃, and 7 sections is 210 ℃, the extruder rotating speed is 80rad/min, and hauling speed is 600cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 165 ℃, and 2 sections is 175 ℃, and 3 sections is 186 ℃, 4 sections is 180 ℃, the die head length of extruder die Head Section is divided into 4 sections, and every section temperature is: 1 section is 200 ℃, and 2 sections is 186 ℃, 3 sections is 180 ℃, 4 sections is 165 ℃, and the extruder rotating speed is 85rad/min, and hauling speed is 550cm/min; Polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.4: 1, and the outer field density of polyolefin PP is 0.898g/cm
3, the density of polyolefin PE internal layer is 0.945g/cm
3, the density in PVDC mesosphere is 1.9g/cm
3In conjunction with after composite pipe in the vacuum of 0.03Mpa, after water temperature is 23 ℃ of following sizings, place 21 ℃ water to carry out the secondary cooling again, product is printed, traction, scale cutting tubing of the present invention, said polyolefin PP skin is mixed for 5 parts by 3 parts of the white color masterbatches of by weight 100 parts of Korea S star R200P dawn, Cabot board and EVA plasticizer and is crushed to; Said PVDC mesosphere is mixed by by weight 0.4 part in 6 parts of 97 parts of PVDC resins, zine stearates, PE wax and processing aid ACR4016 part and is crushed to; Said polyolefin PE internal layer is mixed for 3 parts by the white color masterbatch of by weight 97 parts of PE resins, Cabot board and is crushed to.
9. polyolefin PP/PVDC/ polyolefin PE multilayer composite pipe according to claim 1, it is characterized in that, with polyolefin PP skin, the PVDC mesosphere, after the polyolefin PE internal layer is extruded heating by extruder respectively, extrude skin by same extrusion neck ring mold again by polyolefin PP, 3 layers of co-extrusion of PVDC mesosphere and polyolefin PE internal layer, the composite pipe of adjacent layer combination closely, wherein, the machine barrel section length of the extruder of polyolefin PP skin and polyolefin PE internal layer is divided into 4 sections, every section temperature is: 1 section is 172 ℃, 2 sections is 179 ℃, and 3 sections is 189 ℃, and 4 sections is 189 ℃, the die head length of extruder die Head Section is divided into 7 sections, every section temperature is: 1 section is 198 ℃, and 2 sections is 189 ℃, and 3 sections is 189 ℃, 4 sections is 193 ℃, 5 sections is 205 ℃, and 6 sections is 207 ℃, and 7 sections is 213 ℃, the extruder rotating speed is 115rad/min, and hauling speed is 850cm/min; The machine barrel section length of the extruder in PVDC mesosphere is divided into 4 sections, every section temperature is: 1 section is 169 ℃, and 2 sections is 179 ℃, and 3 sections is 189 ℃, 4 sections is 183 ℃, the die head length of extruder die Head Section is divided into 4 sections, and every section temperature is: 1 section is 203 ℃, and 2 sections is 189 ℃, 3 sections is 183 ℃, 4 sections is 169 ℃, and the extruder rotating speed is 110rad/min, and hauling speed is 750cm/min; Polyolefin PP skin: PVDC mesosphere: the thickness ratio of polyolefin PE internal layer is 1: 0.5: 1, and the outer field density of polyolefin PP is 0.9g/cm
3, the density of polyolefin PE internal layer is 0.955g/cm
3, the density in PVDC mesosphere is 1.95g/cm
3In conjunction with after composite pipe in the vacuum of 0.035MPa, after water temperature is 24 ℃ of following sizings, place 22 ℃ water to carry out the secondary cooling again, product is printed, traction, scale cutting tubing of the present invention, said polyolefin PP skin is mixed for 7 parts by 4 parts of the color masterbatches of the white of by weight 105 parts of Korea S star R200P dawn, Cabot board and EPDM plasticizer and is crushed to; Said PVDC mesosphere is mixed for 9 parts by by weight 0.5 part in 7 parts of 98 parts of PVDC resins, barium stearates, OPE wax and processing aid AMS and is crushed to; Said polyolefin PE internal layer is mixed for 4 parts by the color masterbatch of the white of by weight 98 parts of PE resins, Cabot board and is crushed to.
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