CN107417987A - A kind of pvc pipe extruding-out process of effectively lifting tensile strength - Google Patents

A kind of pvc pipe extruding-out process of effectively lifting tensile strength Download PDF

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Publication number
CN107417987A
CN107417987A CN201710662190.7A CN201710662190A CN107417987A CN 107417987 A CN107417987 A CN 107417987A CN 201710662190 A CN201710662190 A CN 201710662190A CN 107417987 A CN107417987 A CN 107417987A
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Prior art keywords
stabilizer
pipe
resin
temperature
filler
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Inventor
朱学超
许光辉
李明
张燕
叶芝南
崔亮
郭兵
张友亮
张跃
柏成锐
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Anhui Botai Plastic Technology Co Ltd
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Anhui Botai Plastic Technology Co Ltd
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Priority to CN201710662190.7A priority Critical patent/CN107417987A/en
Publication of CN107417987A publication Critical patent/CN107417987A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
    • C08L3/06—Esters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045—Sulfates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A kind of pvc pipe extruding-out process of effectively lifting tensile strength, it is characterised in that：Formulating of recipe for pipes includes polyvinyl chloride resin and epoxy resin copolymer, anti-impact modifier, stabilizer, modifier, filler, colorant and external lubricant, specifically includes following steps and is prepared：Various material weighings mediate extruding pelletization extrusion molding and are cooled and shaped cutting inspection finished product.The outstanding advantages of plastic pipe：Relative density is small, equivalent to the 1/4 1/7 of metal；Electrical insulation capability, chemical stability are excellent；Install, be easy for construction, maintenance is easy；Specific energy consumption is cheap.

Description

A kind of pvc pipe extruding-out process of effectively lifting tensile strength
Technical field：
The present invention relates to pipeline preparation field, and in particular to a kind of pvc pipe extrusion molding work of effectively lifting tensile strength Skill.
Background technology：
PVC is the white powder of impalpable structure, and the degree of branching is smaller, relative density 1.4 or so, glass transition temperature 77~90 DEG C, 170 DEG C or so start to decompose, poor to the stability of light and heat, more than 100 DEG C or through long-time exposure in sunshine, Jiu Huifen Solve and produce hydrogen chloride, and further autocatalysis is decomposed, and causes discoloration, physical and mechanical properties also declines rapidly, actually should Stabilizer is must be added in improve the stability to light and heat.
Industrial PVC molecular weight has a larger polydispersity typically in the range of 50,000~110,000, molecular weight with The reduction of polymerization temperature and increase；Without definite melting point, 80~85 DEG C start to soften, and 130 DEG C are changed into viscoelastic state, and 160~180 DEG C are opened Beginning is changed into viscous state；There are preferable mechanical performance, tensile strength 60MPa or so, 5~10kJ/m2 of impact strength；Have excellent Dielectric properties.
PVC was once the general-purpose plastics that yield is maximum in the world, using very extensive.In construction material, industrial product, daily Product, flooring laminate, floor tile, artificial leather, tubing, electric wire, packaging film, bottle, expanded material, encapsulant, fiber etc. It is widely used.
The content of the invention：
The technical problems to be solved by the invention are to overcome prior art to provide a kind of PVC of effectively lifting tensile strength Tube extrusion molding technique.
The technical problems to be solved by the invention are realized using following technical scheme.
A kind of pvc pipe extruding-out process of effectively lifting tensile strength, it is characterised in that：Formulating of recipe for pipes includes Polyvinyl chloride resin and epoxy resin copolymer, anti-impact modifier, stabilizer, modifier, filler, colorant and external lubricant, Following steps are specifically included to be prepared：Various material-weighing-kneading-extruding pelletization-extrusion molding-cooling and shaping-cuttings- Inspection-finished product；
1) hybrid technique
In mixed at high speed, auxiliary agent penetrates into the space of polyvinyl chloride resin, makes auxiliary agent dispersed in resin, it is contemplated that temperature Be advantageous to vapor in material more than 1000 DEG C to steam, so the temperature of the mixed machine of heat is located at 100~1200 DEG C；In order to allow auxiliary agent Fully with PVC asperity contacts, suction-operated of the filler to auxiliary agent is reduced, it should it is mixed to start heat after polyvinyl chloride resin is added Machine, then feed intake in the following order：Stabilizer, various processing aids, colorant, filler；
The mixture temperature that the mixed machine of heat is released is very high, need to be cooled down immediately, if radiating can cause material to decompose not in time Volatilized with auxiliary agent；Cold mixing system discharges in 400 DEG C of material temperature；
2) 3 sections of extruder screw point：Feeding section (feeding section), fusing section (compression section), metering section (homogenizing zone), this Three sections constitute 3 functional areas to material accordingly：Solid conveying zone, material plasticizing area, melt delivery area.
The barrel temperature of solid conveying zone is controlled at 100~1400 DEG C；If charge temperature is too low, prolong solid conveying zone It is long, reduce the length of plasticizing zone and melt delivery area, plasticizing can be caused bad, influence product quality；
The temperature control in material plasticizing area is at 170~1900 DEG C；The vacuum for controlling this section is that an important technique refers to Mark, if vacuum is relatively low, can influence exhaust effect, cause there is bubble in tubing, seriously reduce the mechanical property of tubing, be The gas inside material is easily escaped, answer control material can not be too high in this section of gelation degree, while also often to clear up Gas exhaust piping is with antifouling；Barrel vacuum is generally 0.08~0.09MPa；
The temperature of melt delivery area answer it is more lower slightly, be 160~1800 DEG C；Screw speed, reduction head are improved in the section Resistance and improve pressure in plasticizing zone and be all advantageous to the raising of transfer rate, should not be in this section for thermosensitive plastic as PVC Residence time is long, and screw speed is generally 20~30r/min；
Head is the important component of extruded product shaping, and its effect is to produce higher melt pressure and make melt forming For required shape.Each several part technological parameter is respectively：1650 DEG C of mouth mold connector temperature, 1700 DEG C of die temperature, 1700 DEG C, 1650℃、1800℃、1900℃；
3) setting process
The tube come from head die extrusion will make it be hardened and shape through supercooling, and sizing is carried out outer with calibration sleeve Footpath is shaped, and the sizing its length of external diameter sizing typically takes 3 times of its internal diameter, and the cooling means of tubing is molded for vacuum cooled, Vacuum cooled shaping is that vacuum tank is evacuated by means of vavuum pump, the absorption of pipe outer wall is reached on the inwall of shaping cover To cooling and shaping, the process conditions of Vacuum shaping are：20.0~53.3kPa of vacuum, 15~250 DEG C of water temperature, in vacuum tank Water nebulizes to be optimal；If vacuum is less than normal, cause pipe external diameter less than normal, less than standard size；Conversely, if vacuum is bigger than normal, manage Footpath is bigger than normal, or even occurs taking out swollen phenomenon.If water temperature is too low, sizing is incomplete, and can increase tubing fragility；If water temperature over-high, It can then cause to cool down bad, cause tubing easily to deform；
4) traction technique
The effect of draw-gear is to provide certain tractive force and hauling speed to the tubing of head extrusion, is equably drawn Tubing, and by adjusting the wall thickness of hauling speed regulation pipe, hauling speed depends on extruded velocity, and hauling speed is than extrusion speed Spend fast 1%~3%.
Further technology：In order to obtain rapid and uniform plasticizing, it should using suspension method loose type resin；
--- for the resin of double-wall corrugated pipe, should especially have good molecular weight distribution and impurity level, to reduce tubing In " flake ", avoid the rupture collapsed with tube wall of tubing ripple；
--- the resin of water supply pipe, " sanitation-grade " should be belonged to, residual vinyl chloride is within lmg/kg in resin；
In order to ensure the quality of tubing, defect rate is reduced, the source of resin will stablize.
Further technology：Stabilizer is：Tribasic lead sulfate and dibasic lead salt, metal soap and use, complex lead salt are steady The stabilizer (as contain Pb, Ba, Cd) of agent, rare earth composite stabilizer, organic tin stabilizer containing heavy metal is determined to human health, Dosage of these stabilizers in feed pipe formula is restricted；Single screw extrusion flow, material thermal histories are compared with twin-screw extrusion Flow will be grown, stabilizing agent dosage the former compared with the latter to increase by more than 25%；The head temperature of double-wall corrugated pipe is higher, and material is in machine The residence time is longer in head, the amount ratio common tube formula more 10% of stabilizer in formula.
Further technology：The effect of filler is can to reduce cost；Using the filler of superfine active, tubing amount ratio section bar Greatly, amount of filler crosses conference and causes impact resistance reduction and the decline of pipe resistance to pressure, so, in chemical industry pipe and feed pipe, fill out Expect dosage within 10 parts；Drainpipe, amount of filler can be some more in clod wash threading sleeve pipe, while increase CPE dosage to change The decline of impact property；
Relatively low tubing, and the pipe that rains are required pipe performance, and amount of filler can be very big, but double screw extruder is worn It is more serious.
Further technology：The matched design of external lubricant and stabilizer；Organic tin stabilizer, organic tin stabilizer and PVC Resin has preferable compatibility, has the tendency of serious adhesiving metal wall, matching generally the least expensive external lubricant is with stone Paraffin-calcium stearate system based on wax；
Lead salt stabilizer, lead salt stabilizer and polyvinyl chloride resin poor compatibility, are only attached to PVC particle surfaces, hinder PVC grains Fusion between son, generally use lead stearate-calcium stearate external lubricant are matching.
When using shock resistance plasticized modifier, because melt viscosity is big, the possibility of metal surface is adhered to regard to big, it is past Toward the dosage for needing increase external lubricant；The light-wall pipe extruded with same equipment is than the outer profit needed for the thick-walled pipe of same specification Lubrication prescription is more.When processing temperature is high, the tendency on melt adhesiving metal surface is big, and the external lubricant added is just more.
Described polyvinyl chloride resin is prepared with epoxy resin copolymer including following components：
Polyvinyl chloride resin includes with epoxy resin copolymer preparation method：
Step 1：Water and disodium hydrogen phosphate are put into tank diameter by proportioning, 60 DEG C are warming up in the case where being stirred continuously so that Disodium phosphate soln is completely dissolved, and reactor is added after being sufficiently mixed cornstarch and disodium phosphate soln by proportioning In, material stirs 70-80 DEG C of heating in the reactor, when discharge reduction is to less than 20%, is warming up to 150-200 DEG C, makes shallow lake Powder is reacted with disodium hydrogen phosphate, when the viscosity of material is more than 50Pas, terminating reaction, cooling discharge, produces phosphate Starch；
Step 2：50% sodium hydrate aqueous solution, limewash and polyvinyl chloride resin are mixed；
Step 3：Phosphate ester starch in mixed solvent in step 2 and step 1 is added in bottle, stirred, 5-9 Hour；
Step 4：Paraffin and stabilizer are added in reactor, is completely dissolved paraffin within 4 hours with 90 DEG C of stirrings, is cooled to 75℃；
Mixed by glycerine, with novolaks, add the mixture of step 3 and step 4, about 1-2 hours drip off, insulation reaction 1 hour, epoxy resin is then added, continues heating stirring 1 hour, temperature drops to less than 50 DEG C.
Beneficial effect：The outstanding advantages of plastic pipe：Relative density is small, equivalent to the 1/4-1/7 of metal；Electrical insulating property Energy, chemical stability are excellent；Install, be easy for construction, maintenance is easy；Specific energy consumption is cheap.
Embodiment：
In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below Specific embodiment is closed, the present invention is expanded on further.
Embodiment 1：A kind of pvc pipe extruding-out process of effectively lifting tensile strength, formulating of recipe for pipes include PVC trees Fat, anti-impact modifier, stabilizer, modifier, filler, colorant and external lubricant, specifically include following steps preparation Form：Various material-weighing-kneading-extruding pelletization-extrusion molding-cooling and shaping-cutting-inspection-finished products；
2) hybrid technique
In mixed at high speed, auxiliary agent penetrates into the space of polyvinyl chloride resin, makes auxiliary agent dispersed in resin, it is contemplated that temperature Be advantageous to vapor in material more than 1000 DEG C to steam, so the temperature of the mixed machine of heat is located at 100~1200 DEG C；In order to allow auxiliary agent Fully with PVC asperity contacts, suction-operated of the filler to auxiliary agent is reduced, it should it is mixed to start heat after polyvinyl chloride resin is added Machine, then feed intake in the following order：Stabilizer, various processing aids, colorant, filler；
The mixture temperature that the mixed machine of heat is released is very high, need to be cooled down immediately, if radiating can cause material to decompose not in time Volatilized with auxiliary agent；Cold mixing system discharges in 400 DEG C of material temperature；
2) 3 sections of extruder screw point：Feeding section (feeding section), fusing section (compression section), metering section (homogenizing zone), this Three sections constitute 3 functional areas to material accordingly：Solid conveying zone, material plasticizing area, melt delivery area.
The barrel temperature of solid conveying zone is controlled at 100~1400 DEG C；If charge temperature is too low, prolong solid conveying zone It is long, reduce the length of plasticizing zone and melt delivery area, plasticizing can be caused bad, influence product quality；
The temperature control in material plasticizing area is at 170~1900 DEG C；The vacuum for controlling this section is that an important technique refers to Mark, if vacuum is relatively low, can influence exhaust effect, cause there is bubble in tubing, seriously reduce the mechanical property of tubing, be The gas inside material is easily escaped, answer control material can not be too high in this section of gelation degree, while also often to clear up Gas exhaust piping is with antifouling；Barrel vacuum is generally 0.08~0.09MPa；
The temperature of melt delivery area answer it is more lower slightly, be 160~1800 DEG C；Screw speed, reduction head are improved in the section Resistance and improve pressure in plasticizing zone and be all advantageous to the raising of transfer rate, should not be in this section for thermosensitive plastic as PVC Residence time is long, and screw speed is generally 20~30r/min；
Head is the important component of extruded product shaping, and its effect is to produce higher melt pressure and make melt forming For required shape.Each several part technological parameter is respectively：1650 DEG C of mouth mold connector temperature, 1700 DEG C of die temperature, 1700 DEG C, 1650℃、1800℃、1900℃；
3) setting process
The tube come from head die extrusion will make it be hardened and shape through supercooling, and sizing is carried out outer with calibration sleeve Footpath is shaped, and the sizing its length of external diameter sizing typically takes 3 times of its internal diameter, and the cooling means of tubing is molded for vacuum cooled, Vacuum cooled shaping is that vacuum tank is evacuated by means of vavuum pump, the absorption of pipe outer wall is reached on the inwall of shaping cover To cooling and shaping, the process conditions of Vacuum shaping are：20.0~53.3kPa of vacuum, 15~250 DEG C of water temperature, in vacuum tank Water nebulizes to be optimal；If vacuum is less than normal, cause pipe external diameter less than normal, less than standard size；Conversely, if vacuum is bigger than normal, manage Footpath is bigger than normal, or even occurs taking out swollen phenomenon.If water temperature is too low, sizing is incomplete, and can increase tubing fragility；If water temperature over-high, It can then cause to cool down bad, cause tubing easily to deform；
4) traction technique
The effect of draw-gear is to provide certain tractive force and hauling speed to the tubing of head extrusion, is equably drawn Tubing, and by adjusting the wall thickness of hauling speed regulation pipe, hauling speed depends on extruded velocity, and hauling speed is than extrusion speed Spend fast 1%~3%.
In order to obtain rapid and uniform plasticizing, it should using suspension method loose type resin；
--- for the resin of double-wall corrugated pipe, should especially have good molecular weight distribution and impurity level, to reduce tubing In " flake ", avoid the rupture collapsed with tube wall of tubing ripple；
--- the resin of water supply pipe, " sanitation-grade " should be belonged to, residual vinyl chloride is within lmg/kg in resin；
In order to ensure the quality of tubing, defect rate is reduced, the source of resin will stablize.
Stabilizer is：Tribasic lead sulfate and dibasic lead salt, metal soap and use, complex lead salt stabilizer, rare earth are multiple The stabilizer (as contained Pb, Ba, Cd) of stabilizer, organic tin stabilizer containing heavy metal is closed to human health, these stabilizers Dosage in feed pipe formula is restricted；Single screw extrusion flow, material thermal histories will be grown compared with twin-screw extrusion flow, surely Determining agent dosage, the former compared with the latter will increase by more than 25%；The head temperature of double-wall corrugated pipe is higher, when material stops in head Between longer, the amount ratio common tube formula more 10% of stabilizer in formula.
The effect of filler is can to reduce cost；Using the filler of superfine active, tubing amount ratio section bar is big, amount of filler mistake Conference cause impact resistance reduce and pipe resistance to pressure decline, so, chemical industry pipe with feed pipe in, amount of filler 10 parts with It is interior；Drainpipe, amount of filler can be some more in clod wash threading sleeve pipe, while increase CPE dosage to change the decline of impact property；
Relatively low tubing, and the pipe that rains are required pipe performance, and amount of filler can be very big, but double screw extruder is worn It is more serious.
The matched design of external lubricant and stabilizer；Organic tin stabilizer, organic tin stabilizer have preferably with polyvinyl chloride resin Compatibility, there is serious adhesiving metal wall, matching generally the least expensive external lubricant be paraffin based on paraffin- Calcium stearate system；
Lead salt stabilizer, lead salt stabilizer and polyvinyl chloride resin poor compatibility, are only attached to PVC particle surfaces, hinder PVC grains Fusion between son, generally use lead stearate-calcium stearate external lubricant are matching.
When using shock resistance plasticized modifier, because melt viscosity is big, the possibility of metal surface is adhered to regard to big, it is past Toward the dosage for needing increase external lubricant；The light-wall pipe extruded with same equipment is than the outer profit needed for the thick-walled pipe of same specification Lubrication prescription is more.When processing temperature is high, the tendency on melt adhesiving metal surface is big, and the external lubricant added is just more.
Polyvinyl chloride resin is prepared with epoxy resin copolymer including following components：
Polyvinyl chloride resin includes with epoxy resin copolymer preparation method：
Step 1：Water and disodium hydrogen phosphate are put into tank diameter by proportioning, 60 DEG C are warming up in the case where being stirred continuously so that Disodium phosphate soln is completely dissolved, and reactor is added after being sufficiently mixed cornstarch and disodium phosphate soln by proportioning In, material stirs 70-80 DEG C of heating in the reactor, when discharge reduction is to less than 20%, is warming up to 150-200 DEG C, makes shallow lake Powder is reacted with disodium hydrogen phosphate, when the viscosity of material is more than 50Pas, terminating reaction, cooling discharge, produces phosphate Starch；
Step 2：50% sodium hydrate aqueous solution, limewash and polyvinyl chloride resin are mixed；
Step 3：Phosphate ester starch in mixed solvent in step 2 and step 1 is added in bottle, stirred, 5-9 Hour；
Step 4：Paraffin and stabilizer are added in reactor, is completely dissolved paraffin within 4 hours with 90 DEG C of stirrings, is cooled to 75℃；
Mixed by glycerine, with novolaks, add the mixture of step 3 and step 4, about 1-2 hours drip off, insulation reaction 1 hour, epoxy resin is then added, continues heating stirring 1 hour, temperature drops to less than 50 DEG C.
Without definite melting point, 76~86 DEG C start to soften, and 144 DEG C are changed into viscoelastic state, and 160~170 DEG C start to be changed into viscosity flow State；There are preferable mechanical performance, tensile strength 53MPa or so, 3~8kJ/m2 of impact strength；There are excellent dielectric properties.
Embodiment 2：A kind of pvc pipe extruding-out process of effectively lifting tensile strength, formulating of recipe for pipes include PVC trees Fat, anti-impact modifier, stabilizer, modifier, filler, colorant and external lubricant, specifically include following steps preparation Form：Various material-weighing-kneading-extruding pelletization-extrusion molding-cooling and shaping-cutting-inspection-finished products；
3) hybrid technique
In mixed at high speed, auxiliary agent penetrates into the space of polyvinyl chloride resin, makes auxiliary agent dispersed in resin, it is contemplated that temperature Be advantageous to vapor in material more than 1000 DEG C to steam, so the temperature of the mixed machine of heat is located at 100~1200 DEG C；In order to allow auxiliary agent Fully with PVC asperity contacts, suction-operated of the filler to auxiliary agent is reduced, it should it is mixed to start heat after polyvinyl chloride resin is added Machine, then feed intake in the following order：Stabilizer, various processing aids, colorant, filler；
The mixture temperature that the mixed machine of heat is released is very high, need to be cooled down immediately, if radiating can cause material to decompose not in time Volatilized with auxiliary agent；Cold mixing system discharges in 400 DEG C of material temperature；
2) 3 sections of extruder screw point：Feeding section (feeding section), fusing section (compression section), metering section (homogenizing zone), this Three sections constitute 3 functional areas to material accordingly：Solid conveying zone, material plasticizing area, melt delivery area.
The barrel temperature of solid conveying zone is controlled at 100~1400 DEG C；If charge temperature is too low, prolong solid conveying zone It is long, reduce the length of plasticizing zone and melt delivery area, plasticizing can be caused bad, influence product quality；
The temperature control in material plasticizing area is at 170~1900 DEG C；The vacuum for controlling this section is that an important technique refers to Mark, if vacuum is relatively low, can influence exhaust effect, cause there is bubble in tubing, seriously reduce the mechanical property of tubing, be The gas inside material is easily escaped, answer control material can not be too high in this section of gelation degree, while also often to clear up Gas exhaust piping is with antifouling；Barrel vacuum is generally 0.08~0.09MPa；
The temperature of melt delivery area answer it is more lower slightly, be 160~1800 DEG C；Screw speed, reduction head are improved in the section Resistance and improve pressure in plasticizing zone and be all advantageous to the raising of transfer rate, should not be in this section for thermosensitive plastic as PVC Residence time is long, and screw speed is generally 20~30r/min；
Head is the important component of extruded product shaping, and its effect is to produce higher melt pressure and make melt forming For required shape.Each several part technological parameter is respectively：1650 DEG C of mouth mold connector temperature, 1700 DEG C of die temperature, 1700 DEG C, 1650℃、1800℃、1900℃；
3) setting process
The tube come from head die extrusion will make it be hardened and shape through supercooling, and sizing is carried out outer with calibration sleeve Footpath is shaped, and the sizing its length of external diameter sizing typically takes 3 times of its internal diameter, and the cooling means of tubing is molded for vacuum cooled, Vacuum cooled shaping is that vacuum tank is evacuated by means of vavuum pump, the absorption of pipe outer wall is reached on the inwall of shaping cover To cooling and shaping, the process conditions of Vacuum shaping are：20.0~53.3kPa of vacuum, 15~250 DEG C of water temperature, in vacuum tank Water nebulizes to be optimal；If vacuum is less than normal, cause pipe external diameter less than normal, less than standard size；Conversely, if vacuum is bigger than normal, manage Footpath is bigger than normal, or even occurs taking out swollen phenomenon.If water temperature is too low, sizing is incomplete, and can increase tubing fragility；If water temperature over-high, It can then cause to cool down bad, cause tubing easily to deform；
4) traction technique
The effect of draw-gear is to provide certain tractive force and hauling speed to the tubing of head extrusion, is equably drawn Tubing, and by adjusting the wall thickness of hauling speed regulation pipe, hauling speed depends on extruded velocity, and hauling speed is than extrusion speed Spend fast 1%~3%.
In order to obtain rapid and uniform plasticizing, it should using suspension method loose type resin；
--- for the resin of double-wall corrugated pipe, should especially have good molecular weight distribution and impurity level, to reduce tubing In " flake ", avoid the rupture collapsed with tube wall of tubing ripple；
--- the resin of water supply pipe, " sanitation-grade " should be belonged to, residual vinyl chloride is within lmg/kg in resin；
In order to ensure the quality of tubing, defect rate is reduced, the source of resin will stablize.
Stabilizer is：Tribasic lead sulfate and dibasic lead salt, metal soap and use, complex lead salt stabilizer, rare earth are multiple The stabilizer (as contained Pb, Ba, Cd) of stabilizer, organic tin stabilizer containing heavy metal is closed to human health, these stabilizers Dosage in feed pipe formula is restricted；Single screw extrusion flow, material thermal histories will be grown compared with twin-screw extrusion flow, surely Determining agent dosage, the former compared with the latter will increase by more than 25%；The head temperature of double-wall corrugated pipe is higher, when material stops in head Between longer, the amount ratio common tube formula more 10% of stabilizer in formula.
The effect of filler is can to reduce cost；Using the filler of superfine active, tubing amount ratio section bar is big, amount of filler mistake Conference cause impact resistance reduce and pipe resistance to pressure decline, so, chemical industry pipe with feed pipe in, amount of filler 10 parts with It is interior；Drainpipe, amount of filler can be some more in clod wash threading sleeve pipe, while increase CPE dosage to change the decline of impact property；
Relatively low tubing, and the pipe that rains are required pipe performance, and amount of filler can be very big, but double screw extruder is worn It is more serious.
The matched design of external lubricant and stabilizer；Organic tin stabilizer, organic tin stabilizer have preferably with polyvinyl chloride resin Compatibility, there is serious adhesiving metal wall, matching generally the least expensive external lubricant be paraffin based on paraffin- Calcium stearate system；
Lead salt stabilizer, lead salt stabilizer and polyvinyl chloride resin poor compatibility, are only attached to PVC particle surfaces, hinder PVC grains Fusion between son, generally use lead stearate-calcium stearate external lubricant are matching.
When using shock resistance plasticized modifier, because melt viscosity is big, the possibility of metal surface is adhered to regard to big, it is past Toward the dosage for needing increase external lubricant；The light-wall pipe extruded with same equipment is than the outer profit needed for the thick-walled pipe of same specification Lubrication prescription is more.When processing temperature is high, the tendency on melt adhesiving metal surface is big, and the external lubricant added is just more.
Polyvinyl chloride resin is prepared with epoxy resin copolymer including following components：
Polyvinyl chloride resin includes with epoxy resin copolymer preparation method：
Step 1：Water and disodium hydrogen phosphate are put into tank diameter by proportioning, 60 DEG C are warming up in the case where being stirred continuously so that Disodium phosphate soln is completely dissolved, and reactor is added after being sufficiently mixed cornstarch and disodium phosphate soln by proportioning In, material stirs 70-80 DEG C of heating in the reactor, when discharge reduction is to less than 20%, is warming up to 150-200 DEG C, makes shallow lake Powder is reacted with disodium hydrogen phosphate, when the viscosity of material is more than 50Pas, terminating reaction, cooling discharge, produces phosphate Starch；
Step 2：50% sodium hydrate aqueous solution, limewash and polyvinyl chloride resin are mixed；
Step 3：Phosphate ester starch in mixed solvent in step 2 and step 1 is added in bottle, stirred, 5-9 Hour；
Step 4：Paraffin and stabilizer are added in reactor, is completely dissolved paraffin within 4 hours with 90 DEG C of stirrings, is cooled to 75℃；
Mixed by glycerine, with novolaks, add the mixture of step 3 and step 4, about 1-2 hours drip off, insulation reaction 1 hour, epoxy resin is then added, continues heating stirring 1 hour, temperature drops to less than 50 DEG C.
Without definite melting point, 86~92 DEG C start to soften, and 150 DEG C are changed into viscoelastic state, and 160~180 DEG C start to be changed into viscosity flow State；There are preferable mechanical performance, tensile strength 65MPa or so, 7~10kJ/m2 of impact strength；There are excellent dielectric properties.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (7)

  1. A kind of 1. pvc pipe extruding-out process of effectively lifting tensile strength, it is characterised in that：Formulating of recipe for pipes includes PVC Resin and epoxy resin copolymer, anti-impact modifier, stabilizer, modifier, filler, colorant and external lubricant, tool Body, which comprises the following steps, to be prepared：Various material-weighing-kneading-extruding pelletization-extrusion molding-cooling and shaping-cutting-inspections Test-finished product；
    1) hybrid technique
    In mixed at high speed, auxiliary agent penetrates into the space of polyvinyl chloride resin, makes auxiliary agent dispersed in resin, and the temperature of the mixed machine of heat is set At 100~1200 DEG C；Add after polyvinyl chloride resin and start the mixed machine of heat, then feed intake in the following order：Stabilizer, various processing aids, Colorant, filler；
    Cold mixing system discharges in 400 DEG C of material temperature；
    2) 3 sections of extruder screw point：Feeding section (feeding section), fusing section (compression section), metering section (homogenizing zone), this three sections 3 functional areas are constituted to material accordingly：Solid conveying zone, material plasticizing area, melt delivery area.
    The barrel temperature of solid conveying zone is controlled at 100~1400 DEG C；
    The temperature control in material plasticizing area is at 170~1900 DEG C；Barrel vacuum is generally 0.08~0.09MPa；
    The temperature of melt delivery area answer it is more lower slightly, be 160~1800 DEG C；Screw speed is generally 20~30r/min；
    Head is the important component of extruded product shaping, and its effect is to produce higher melt pressure and make melt forming for institute The shape needed.Each several part technological parameter is respectively：1650 DEG C of mouth mold connector temperature, 1700 DEG C of die temperature, 1700 DEG C, 1650 ℃、1800℃、1900℃；
    3) setting process
    The tube come from head die extrusion will make it be hardened and shape through supercooling, and sizing carries out external diameter with calibration sleeve and determined Type, the sizing its length of external diameter sizing typically take 3 times of its internal diameter, and the cooling means of tubing is molded for vacuum cooled, vacuum Cooling and shaping are that vacuum tank is evacuated by means of vavuum pump, the absorption of pipe outer wall is reached cold on the inwall of shaping cover But shape, the process conditions of Vacuum shaping are：20.0~53.3kPa of vacuum, 15~250 DEG C of water temperature, water in vacuum tank into Vaporific is optimal；
    4) traction technique
    The effect of draw-gear is to provide certain tractive force and hauling speed to the tubing of head extrusion, equably fairlead Material, and by adjusting the wall thickness of hauling speed regulation pipe, hauling speed depends on extruded velocity, and hauling speed compares extruded velocity Fast 1%~3%.
  2. 2. according to a kind of pvc pipe extruding-out process for effectively lifting tensile strength described in claim 1, its feature exists In：Described further technology：In order to obtain rapid and uniform plasticizing, it should using suspension method loose type resin；
    --- for the resin of double-wall corrugated pipe, should especially have good molecular weight distribution and impurity level, to reduce in tubing " flake ", avoid the rupture collapsed with tube wall of tubing ripple；
    --- the resin of water supply pipe, " sanitation-grade " should be belonged to, residual vinyl chloride is within lmg/kg in resin；
    In order to ensure the quality of tubing, defect rate is reduced, the source of resin will stablize.
  3. 3. according to a kind of pvc pipe extruding-out process for effectively lifting tensile strength described in claim 1, its feature exists In：Stabilizer is：Tribasic lead sulfate and dibasic lead salt, metal soap and use, complex lead salt stabilizer, rare earth stable composition The stabilizer of agent, organic tin stabilizer containing heavy metal is feeding water (as contained Pb, Ba, Cd) to human health, these stabilizers Dosage in pipe formula is restricted；Single screw extrusion flow, material thermal histories will be grown compared with twin-screw extrusion flow, and stabilizer is used More than 25% will be increased compared with the latter by measuring the former；The head temperature of double-wall corrugated pipe is higher, and material residence time in head is longer, The amount ratio common tube formula more 10% of stabilizer in formula.
  4. 4. according to a kind of pvc pipe extruding-out process for effectively lifting tensile strength described in claim 1, its feature exists In：The effect of filler is can to reduce cost；Using the filler of superfine active, tubing amount ratio section bar is big, and amount of filler crosses conference Impact resistance reduction and pipe resistance to pressure is caused to decline, so, in chemical industry pipe and feed pipe, amount of filler is within 10 parts； Drainpipe, amount of filler can be some more in clod wash threading sleeve pipe, while increase CPE dosage to change the decline of impact property；
    Relatively low tubing, and the pipe that rains are required pipe performance, and amount of filler can be very big, but double screw extruder is worn tighter Weight.
  5. 5. according to a kind of pvc pipe extruding-out process for effectively lifting tensile strength described in claim 1, its feature exists In：The matched design of external lubricant and stabilizer；Organic tin stabilizer, organic tin stabilizer have preferably compatible with polyvinyl chloride resin Property, there is serious adhesiving metal wall, matching generally the least expensive external lubricant is paraffin-tristearin based on paraffin Sour calcium system；
    Lead salt stabilizer, lead salt stabilizer and polyvinyl chloride resin poor compatibility are only attached to PVC particle surfaces, hinder between PVC particles Fusion, generally use lead stearate-calcium stearate external lubricant is matching.
  6. 6. according to a kind of pvc pipe extruding-out process for effectively lifting tensile strength described in claim 1, its feature exists In：Described polyvinyl chloride resin is prepared with epoxy resin copolymer including following components：
  7. 7. according to a kind of pvc pipe extruding-out process for effectively lifting tensile strength described in claim 6, its feature exists In：Polyvinyl chloride resin includes with epoxy resin copolymer preparation method：
    Step 1：Water and disodium hydrogen phosphate are put into tank diameter by proportioning, 60 DEG C are warming up in the case where being stirred continuously so that phosphoric acid Disodium hydrogen solution is completely dissolved, and is added after being sufficiently mixed cornstarch and disodium phosphate soln by proportioning in reactor, thing Material 70-80 DEG C of stirring heating in the reactor, when discharge reduction is to less than 20%, is warming up to 150-200 DEG C, makes starch and phosphorus Sour disodium hydrogen is reacted, and when the viscosity of material is more than 50Pas, terminating reaction, cooling discharge, produces phosphate ester starch；
    Step 2：50% sodium hydrate aqueous solution, limewash and polyvinyl chloride resin are mixed；
    Step 3：Phosphate ester starch in mixed solvent in step 2 and step 1 is added in bottle, stirred, 5-9 is small When；
    Step 4：Paraffin and stabilizer are added in reactor, is completely dissolved paraffin within 4 hours with 90 DEG C of stirrings, is cooled to 75 ℃；
    Mixed by glycerine, with novolaks, add the mixture of step 3 and step 4, about 1-2 hours drip off, and insulation reaction 1 is small When, epoxy resin is then added, continues heating stirring 1 hour, temperature drops to less than 50 DEG C.
CN201710662190.7A 2017-08-04 2017-08-04 A kind of pvc pipe extruding-out process of effectively lifting tensile strength Pending CN107417987A (en)

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Publication number Priority date Publication date Assignee Title
CN108215109A (en) * 2017-12-24 2018-06-29 中山市小榄企业服务有限公司 A kind of manufacturing method of fiber optic protection blank pipe
CN108276701A (en) * 2018-02-02 2018-07-13 陕西甘霖实业有限公司 A kind of PVC pipe production technology
CN114294484A (en) * 2021-12-31 2022-04-08 张家港市远创塑料机械有限公司 Novel PVC (polyvinyl chloride) pipe and processing method thereof

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
王亚明 申长雨主编: "《塑料门窗制造新技术》", 30 June 2000, 中国轻工业出版社 *
王加龙: "《塑料成型工艺》", 30 June 2009, 印刷工业出版社 *
齐桂亮: "《废旧塑料回收利用实用技术》", 31 October 2011, 机械工业出版社 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108215109A (en) * 2017-12-24 2018-06-29 中山市小榄企业服务有限公司 A kind of manufacturing method of fiber optic protection blank pipe
CN108276701A (en) * 2018-02-02 2018-07-13 陕西甘霖实业有限公司 A kind of PVC pipe production technology
CN114294484A (en) * 2021-12-31 2022-04-08 张家港市远创塑料机械有限公司 Novel PVC (polyvinyl chloride) pipe and processing method thereof

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Application publication date: 20171201