CN101761707A - Coextrusion composite polypropylene soft pipe and production method - Google Patents

Coextrusion composite polypropylene soft pipe and production method Download PDF

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Publication number
CN101761707A
CN101761707A CN200910239054A CN200910239054A CN101761707A CN 101761707 A CN101761707 A CN 101761707A CN 200910239054 A CN200910239054 A CN 200910239054A CN 200910239054 A CN200910239054 A CN 200910239054A CN 101761707 A CN101761707 A CN 101761707A
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China
Prior art keywords
polypropylene
pipe
layer
composite
soft
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Pending
Application number
CN200910239054A
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Chinese (zh)
Inventor
陈寿
陈文涛
林茂青
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SHANGHAI TONGCHAN BEAUTY STAR PACKAGING MATERIAL CO Ltd
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SHANGHAI TONGCHAN BEAUTY STAR PACKAGING MATERIAL CO Ltd
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Priority to CN200910239054A priority Critical patent/CN101761707A/en
Publication of CN101761707A publication Critical patent/CN101761707A/en
Priority to PCT/CN2010/002176 priority patent/WO2011079517A1/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
    • B65D35/02—Body construction
    • B65D35/10—Body construction made by uniting or interconnecting two or more components
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/006—Using vacuum
    • 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
    • B29C2948/92514—Pressure
    • 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
    • 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
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • B29C2948/92819—Location or phase of control
    • B29C2948/92923—Calibration, after-treatment or cooling zone
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/22—Articles comprising two or more components, e.g. co-extruded layers the components being layers with means connecting the layers, e.g. tie layers or undercuts
    • 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
    • B29C48/904—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 using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
    • 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
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/005—Hoses, i.e. flexible

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention relates to a coextrusion composite polypropylene soft pipe and a production method; the coextrusion composite polypropylene soft pipe comprises a pipe head and a pipe body, the pipe body is a composite structure with 2-5 layers, wherein at least one layer material is the polypropylene or the mixture of the polypropylene and polyethylene, the raw material of the polypropylene adopts 0.5-2.0g/10min of melt index and is random copolymerization polypropylene catalyzed by metallocene catalyst; the pipe body of the soft pipe is produced by adopting coextrusion process, especially, raw materials of all layers of the pipe body of the soft pipe are added in respective single screw extrusion machine from each hopper, and the materials are melted and are coextruded out from the same molding mixing machine, and then drawing, cooling, vacuum formation, heat treatment, traction, and fixed length cutting are carried out, so as to obtain the pipe body, and mature head injection, printing, post processing, packaging and other procedures are carried out to the pipe body, so as to obtain the composite polypropylene soft pipe finished product. The composite polypropylene soft pipe has high transparency and is harder than the existing product, and the whole weight of the soft pipe is reduced.

Description

Coextrusion composite polypropylene soft pipe and production method thereof
Technical field
The invention belongs to the composite packing hose field, relate in particular to a kind of composite polypropylene soft pipe and production method thereof.
Background technique
At present, the domestic coextruded multilayer composite soft tube that is used for products such as cosmetics generally adopts polyethylene resin (claiming PE again), makes by molding and forming or extruding and moulding.The polyethylene resin moulding processability is good, and ductility is good, toughness, lower temperature resistance excellence, and chemical stability is outstanding, but heat resistance is not high, and environmental stress crack resistance, stickiness, adhesiveness and printing are poor.To O 2, CO 2Good permeability is arranged, but to the poor permeability of water vapor, air.Acrylic resin (claiming PP again) be in the plastics except that 4-methyl-1-pentene and polyallomer the lightest plastics of density, it has excellent counter-bending fatigability, its goods bent at normal temperatures 10 6Inferior and do not damage, scratch resistant is good, to the good barrier property of water vapor, is the good wrapper of transparency.Know that by retrieval except the applicant, domestic temporary nothing adopts polypropylene material to prepare the relevant report of cosmetic package composite soft tube.
Chinese patent CN 1675298A discloses a kind of plasticized polyolefin compositions, though it can provide a kind of improved toughness that has, but do not damage the propylene polymer of its toughness He other performances, but the interpolation of plasticizing agent has increased cost undoubtedly, and general plasticizing agent is all poisonous, it costs an arm and a leg nontoxic plasticizing agent, so plasticized polyolefin compositions is used in the worth worries of its Safety performance of industry such as cosmetic package.
Related its Applicable scope of a kind of high tenacious polypropylene material of Chinese patent CN1995124A is central air-conditioner discharge hose manufacture view.Contain a lot of processing aids in this prescription, one of its advantage is with low cost, if but being used in the cosmetics composite soft tube makes, and the Security and the contaminativity of prescription are worthy of consideration equally.
Summary of the invention
First purpose of the present invention is the problems referred to above at existing polyethylene coextruded multilayer composite soft tube existence, provide a kind of safety, environmental protection, identical with the polyethylene composite soft tube or more excellent and the coextrusion composite polypropylene soft pipe that the flexible pipe overall weight is reduced of performance.
Second purpose of the present invention is to provide a kind of production method of producing described coextrusion composite polypropylene soft pipe.
Coextrusion composite polypropylene soft pipe of the present invention, comprise tube head and pipe shaft, described pipe shaft is 2～5 layers of composite structure, wherein having layer of material at least is polypropylene or polypropylene and poly blend, it is 0.5～2.0g/10min that described polyacrylic raw material adopts melt index, and is the atactic copolymerized polypropene by metallocene catalyst catalysis.
When described flexible pipe pipe shaft was two layer composite structure, wherein the material of one deck was polypropylene or polypropylene and poly blend, and the material of another layer is polypropylene or polypropylene and poly blend or polyethylene, and two-layer material is inequality.
When described flexible pipe pipe shaft was 3～5 layers of composite structure, the material that wherein has one deck at least was polypropylene or polypropylene and poly blend; The material of all the other each layers is polypropylene or polyethylene or tackiness agent or polypropylene and poly blend, perhaps in 3～5 layers of composite structure an intermediate barrier layer is arranged, and barrier material generally adopts ethylene-vinyl alcohol copolymer (being called for short EVOH); The material of adjacent two layers is inequality, and sticker layer is not positioned at outermost surface or innermost layer.
Tackiness agent described in the present invention preferably adopts anhydride modified linear low density of polyethylene polymer.
Polyethylene described in the present invention adopts low density polyethylene preferable.Because it is synthetic that the low density polyethylene raw material is a high-pressure process, its side chain of polyethylene from high pressure process is many, and the existence of side chain must have influence on the folding of molecular chain and closely pile up, and finally causes degree of crystallinity to reduce.Degree of crystallinity reduces, and the transparency of product is better.
The thickness of flexible pipe pipe shaft of the present invention is generally 0.2mm～1.0mm.
The production method of coextrusion composite polypropylene soft pipe of the present invention is:
The pipe shaft of described polypropylene soft pipe adopts coextrusion processes production, comprise the steps: the raw material of each layer of flexible pipe pipe shaft from each hopper joins separately single screw extrusion machine, through fusion after the co-extrusion of same moulding mixed gear end, drawn, cooling, Vacuum shaping then, successively through heat treatment, traction, fixed length cutting, promptly get pipe shaft again; It is 0.5～2.0g/10min that the pp material of polypropylene soft pipe described in the present invention adopts melt index, and is the atactic copolymerized polypropene by metallocene catalyst catalysis.
The flexible pipe pipe shaft that makes again through the head of maturation, printing, after promptly get the composite polypropylene soft pipe finished product after the operation such as processing, packing.
The extruding and moulding temperature that contains polyacrylic layer (its material is polypropylene or polypropylene and poly blend) of flexible pipe pipe shaft is preferably 190 ℃～230 ℃ in the inventive method.The vacuum pressure of described Vacuum shaping 0.003～-0.001MPa between.20 ℃ of-40 ℃ of hot water are adopted in described heat treatment.
The present invention has following technique effect:
(1) the pipe shaft material of flexible pipe of the present invention contains the atactic copolymerized polypropene of new generation that is made by metallocene catalyst catalysis.The polypropylene that the more traditional Ziegler-Natta catalysis technique of this atactic copolymerized polypropene makes, its molecular chain chain length is even, narrow molecular weight distribution, degree of crystallinity is low, is the raising of the product transparency and the reduction of degree of crystallinity brings.Laboratory data shows, when the atactic copolymerized polypropene of metallocene catalysis and the homo-polypropylene modulus of elasticity in static bending are the 2100MPa left and right sides, the mist degree of the atactic copolymerized polypropene extruded product of metallocene catalysis is about 6.5%, and its mist degree of product of homo-polypropylene preparation is 15%.Mist degree claims turbidity again, is the transparent or unsharp degree of opaque material of reflection.Obviously, its transparency of the atactic copolymerized polypropene of metallocene catalysis is better.For example be 6.5% o'clock under the identical situation of mist degree, the atactic copolymerized polypropene modulus of elasticity in static bending of metallocene catalysis is 2100MPa, and the polypropylene that traditional Ziegler-Natta catalysis makes, its modulus of elasticity in static bending only is 1500MPa.The modulus of elasticity in static bending is the reflection of material stiffness, so the product that the atactic copolymerized polypropene of metallocene catalysis makes is firmer than the polypropylene product that traditional Ziegler-Natta catalysis makes.In addition, atactic copolymerized polypropene is compared outstanding advantages such as having lower heat-sealing temperature with the polypropylene that traditional Ziegler-Natta catalysis technique makes with homo-polypropylene.
(2) the inventive method is on the moulding process basis of existing polyethylene compound pipe, after head co-extrusion, cooling and shaping operation, before the traction stretching process, adopt 20 ℃-40 ℃ hot water treatment, can eliminate the internal stress in the composite pipe, improve the toughness of goods, also helped the raising of printing performance simultaneously.
(3) flexible pipe of the present invention is on the basis of satisfying each performance of packing composite soft tube such as cosmetics, and flexible pipe weight reduces, and can reduce the raw material consumption, thereby saves cost.Through the experiment contrast, specification is the D19*84 flexible pipe, and inside and outside is polyethylene layer, the centre is the composite soft tube of the present invention of polypropylene layer, and its weight is about 1.96g, and equal specification polyethylene hose, pipe weight is 2.09g when adopting low density, and pipe weight is 2.17g during high density.
Description of drawings
Fig. 1 is the structural representation of composite polypropylene soft pipe in the embodiment of the invention.
Fig. 2 is the vertical profile TV structure figure of one section flexible pipe pipe shaft among the embodiment one.
Fig. 3 is the vertical profile TV structure figure of one section flexible pipe pipe shaft among the embodiment two.
Fig. 4 is the vertical profile TV structure figure of one section flexible pipe pipe shaft among the embodiment three.
Fig. 5 is the vertical profile TV structure figure of one section flexible pipe pipe shaft among the embodiment four.
Fig. 6 is the vertical profile TV structure figure of one section flexible pipe pipe shaft among the embodiment five.
Fig. 7 is a structural representation of producing the used extrusion equipment of flexible pipe pipe shaft among the embodiment five.
Embodiment
Embodiment one to the structure of embodiment five coextruded multilayer composite polypropylene soft pipe referring to Fig. 1, it comprises pipe shaft 14 and is injection-moulded in together tube head 13 with it, its overall structure is identical with the current packaging flexible pipe, and difference is the structure and the material therefor of pipe shaft 14.Specifically be described below:
Referring to Fig. 1 to Fig. 5, embodiment one pipe shaft 14 of flexible pipe to the embodiment four is three-layer composite structure.The internal layer 3 of flexible pipe pipe shaft and outer 2 is the atactic copolymerized polypropene layer of metallocene catalysis among the embodiment one, and mesosphere 1 is a sticker layer.The internal layer 6 of flexible pipe pipe shaft and outer 5 is the atactic copolymerized polypropene layer of metallocene catalysis among the embodiment two, and mesosphere 4 is a polyethylene layer.The internal layer 9 of flexible pipe pipe shaft is the atactic copolymerized polypropene layer of metallocene catalysis among the embodiment three, and outer 8 is polyethylene layer, and mesosphere 7 is a sticker layer.The internal layer 12 of flexible pipe pipe shaft is a polyethylene layer among the embodiment four, and outer 10 is the atactic copolymerized polypropene layer of metallocene catalysis, and mesosphere 11 is a sticker layer.
The foregoing description one soft body of MULTILAYER COMPOSITE polypropylene soft pipe to the embodiment four adopts coextrusion processes to be prepared from, concrete steps are as follows: the raw material that each layer of flexible pipe pipe shaft is used is respectively from each hopper joins separately single screw extrusion machine, through softening fusion after the co-extrusion of same moulding mixed gear end, drawn, cooling, Vacuum shaping then, successively through heat treatment, traction, fixed length cutting, promptly get the flexible pipe pipe shaft again.Through flexible pipe pipe shaft that said method makes again through the head of maturation, printing, after promptly get the composite polypropylene soft pipe finished product after the operation such as processing, packing.
The extruding and moulding temperature of the polypropylene layer of flexible pipe pipe shaft is 190 ℃～230 ℃ in the foregoing description, and the mold temperature of polyethylene layer is 140 ℃～190 ℃, and the mold temperature of sticker layer is 170 ℃～210 ℃.The vacuum pressure of Vacuum shaping 0.003～-0.001MPa between.20 ℃ of-40 ℃ of hot water are adopted in heat treatment, and this operation is arranged at after the refrigerating work procedure, before the traction operation.Promptly under of the effect of cooled plastic tube, advance to the cutting stage direction with certain speed at tractive force, when entering the heat treatment water tank, the hot water cyclesystem of having opened with the heat water-spraying to the plastic tube circumferential surface.In the whole heat treatment process, plastic tube is in the uniform speed motion state, and spray equipment is statically placed in the heat treatment water tank, thereby has guaranteed the stability of plastic tube heat treatment performance.The advantage of setting up this operation is: relatively without the plastic tube of Overheating Treatment, remaining internal stress significantly reduces in managing, and is embodied in the shortening of printing pretreatment time, and the phenomenon minimizing of pipe shaft distortion takes place owing to the existence of internal stress in the printing process.
Referring to Fig. 6, the flexible pipe pipe shaft is five layers of composite structure among the embodiment five, innermost layer 19 and outermost surface 15 are the atactic copolymerized polypropene layer of metallocene catalysis, mesosphere 17 is a polyethylene layer, being inner binder layer 18 between innermost layer 19 and the mesosphere 17, is outer adhesive layer 16 between outermost surface 15 and the mesosphere 17.
Referring to Fig. 7, the MULTILAYER COMPOSITE flexible pipe forming equipment that embodiment five adopts comprises four single screw extrusion machines altogether, is made up of internal layer screw extruder 25, outer screw extruder 21, mesosphere screw extruder 20 and bonding layer screw extruder 22.Wherein the material diversion extruded of bonding layer screw extruder 22 flows 24 two-part for outer adhesive layered material stream 23 and inner binder layered material.
Five layers of flexible pipe pipe shafts are raw materials used respectively from each hopper joins separately single screw extrusion machine among the embodiment five, through softening fusion after the co-extrusion of same moulding mixed gear end, drawn, cooling, Vacuum shaping then, successively through heat treatment, traction, fixed length cutting, promptly make the flexible pipe pipe shaft again.Detailed working process is as follows:
1, starting power supply switch (main control box and cutting knife control box).
2, judge whether each motor running direction is correct.
3, open extruder heater band (screw rod and die head), about 60 minutes of preheating.
4, weighing is ready to each layered material bucket needed raw material amount, mixes.
5, (mold temperature of polyethylene layer is 140 ℃～190 ℃ to screw extruder, and the mold temperature of the atactic copolymerized polypropene of metallocene catalysis or the atactic copolymerized polypropene of metallocene catalysis and poly blend is at 190 ℃～230 ℃ after the temperature of setting.), add raw material, load onto required size calibration sleeve, fixed cover, scrape hydrosphere, cutting knife copper sheathing and cutting knife guide pin bushing.
6, open the water-cooling tube at each position.
7, open refrigerating machine, temperature is set in 5 ℃～10 ℃.
8, open traction motor, cutting required pipe range length and other parameters of setting on the platform control box.
9, start screw motor, raw material delivers into common extruder head by separately screw extruder after the thermoplastic fusion.Observe material discharging situation, the initial stage is advisable with extrusion at a slow speed, treats slowly to quicken after material is extruded again.
10, the plastics after the fusion become tubulose after the co-extrusion die head is extruded, and plastics are stretched toward the tractor direction, pass the calibration sleeve fixed cover, scrape hydrosphere and carry out cooling and shaping and heat treatment step, and the machine that is pulled again clamps the Chao Qietai direction and advances.The vacuum cooling used air pressure of finalizing the design is-0.003～0.001MPa, and 20 ℃～40 ℃ circulating hot water is adopted in heat treatment.
11, adjust traction motor speed and pressing gap, non-slip with traction belts is principle.
12, behind the startup vacuum motor, whole tank is close to the appropriate location toward the die head direction with the hand runner.
13, shut tank lid, open Cold water tap, the initial stage valve wide open is treated to turn down to half-open position after plastic flexible pipe is crossed in water logging.
14, open the preceding lubricated water valve of water tank.Can coat the plastic tube circumference around firmly being principle with water.
15, open hot-water valve, hot water is sprayed on external peripheral surface equably.
16, after the moulding, the speed of adjusting tractor and screw motor once more makes it moulding.The concrete principle of regulating is: screw speed increases, and pipe thickness increases, and vice versa.Hauling speed improves, and pipe thickness reduces; Hauling speed slows down, and pipe thickness increases.
17, start the cutter motor switch, open to chase after again and cut key, the cut-out action of carrying out plastic tube had both made the plastic flexible pipe body.
With gained flexible pipe pipe shaft again through the head of maturation, printing, after promptly get the composite polypropylene soft pipe finished product after the operation such as processing, packing.
The atactic copolymerized polypropene of the raw material metallocene catalysis in the foregoing description is available from the Hongkong King Pacific of producer (International) Limited, and model is BSPP01, and melt index is between 0.5～2.0g/10min.Polyethylene in the foregoing description adopts low density polyethylene, is provided by China Petroleum ﹠ Chemical Co., Ltd. Maoming Branch.Tackiness agent in the foregoing description adopts anhydride modified linear low-density polyethylene polymer (being called for short ADMER).
Understand for convenient, only the present invention will be described with the foregoing description.All equal conversion of being done on basis of the present invention or correction are all in protection scope of the present invention and so on.

Claims (10)

1. coextrusion composite polypropylene soft pipe, comprise tube head and pipe shaft, it is characterized in that: described pipe shaft is 2～5 layers of composite structure, wherein having layer of material at least is polypropylene or polypropylene and poly blend, it is 0.5～2.0g/10min that described polypropylene material adopts melt index, and is the atactic copolymerized polypropene by metallocene catalyst catalysis.
2. coextrusion composite polypropylene soft pipe according to claim 1, it is characterized in that: described pipe shaft is a two layer composite structure, wherein the material of one deck is polypropylene or polypropylene and poly blend, the material of another layer is polypropylene or polypropylene and poly blend or polyethylene, and two-layer material is inequality.
3. coextrusion composite polypropylene soft pipe according to claim 1, it is characterized in that: described pipe shaft is 3～5 layers of composite structure, the material that wherein has one deck at least is polypropylene or polypropylene and poly blend, the material of all the other each layers is polypropylene or polyethylene or tackiness agent or polypropylene and poly blend, perhaps in 3～5 layers of composite structure an intermediate barrier layer is arranged; The material of adjacent two layers is inequality, and sticker layer is not positioned at outermost surface or innermost layer.
4. coextrusion composite polypropylene soft pipe according to claim 3 is characterized in that: described tackiness agent adopts anhydride modified linear low density of polyethylene polymer.
5. according to claim 1 or 2 or 3 or 4 described coextrusion composite polypropylene soft pipes, it is characterized in that: described polyethylene is a low density polyethylene.
6. according to claim 1 or 2 or 3 or 4 described coextrusion composite polypropylene soft pipes, it is characterized in that: the thickness of described flexible pipe pipe shaft is 0.2mm～1.0mm.
7. the production method of claim 1 or 2 or 3 or 4 described coextrusion composite polypropylene soft pipes, the pipe shaft that it is characterized in that described flexible pipe adopts coextrusion processes production, comprise the steps: the raw material of each layer of flexible pipe pipe shaft from each hopper joins separately single screw extrusion machine, through fusion after the co-extrusion of same moulding mixed gear end, drawn, cooling, Vacuum shaping then, successively through heat treatment, traction, fixed length cutting, promptly get the flexible pipe pipe shaft again; It is 0.5～2.0g/10min that the pp material of described polypropylene soft pipe adopts melt index, and is the atactic copolymerized polypropene by metallocene catalyst catalysis.
8. the production method of coextrusion composite polypropylene soft pipe according to claim 7 is characterized in that: the extruding and moulding temperature that contains polyacrylic layer of described flexible pipe pipe shaft is 190 ℃～230 ℃.
9. according to the production method of claim 7 or 8 described coextrusion composite polypropylene soft pipes, it is characterized in that: the vacuum pressure of described Vacuum shaping 0.003～-0.001MPa between.
10. according to the production method of claim 7 or 8 described coextrusion composite polypropylene soft pipes, it is characterized in that: 20 ℃ of-40 ℃ of hot water are adopted in described heat treatment.
CN200910239054A 2009-12-28 2009-12-28 Coextrusion composite polypropylene soft pipe and production method Pending CN101761707A (en)

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