CN113232373A - Multilayer composite pipe for direct drinking water conveying and preparation method thereof - Google Patents

Multilayer composite pipe for direct drinking water conveying and preparation method thereof Download PDF

Info

Publication number
CN113232373A
CN113232373A CN202110372838.3A CN202110372838A CN113232373A CN 113232373 A CN113232373 A CN 113232373A CN 202110372838 A CN202110372838 A CN 202110372838A CN 113232373 A CN113232373 A CN 113232373A
Authority
CN
China
Prior art keywords
layer
hot melt
melt adhesive
composite pipe
heating temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110372838.3A
Other languages
Chinese (zh)
Inventor
金霄
薛冠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linhai Weixing New Building Materials Co Ltd
Original Assignee
Linhai Weixing New Building Materials Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linhai Weixing New Building Materials Co Ltd filed Critical Linhai Weixing New Building Materials Co Ltd
Priority to CN202110372838.3A priority Critical patent/CN113232373A/en
Publication of CN113232373A publication Critical patent/CN113232373A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B29C48/152—Coating hollow articles the inner surfaces thereof
    • B29C48/153—Coating both inner and outer surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F259/00—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00
    • C08F259/08—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00 on to polymers containing fluorine
    • 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
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J151/003—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • 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
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • 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

Abstract

The invention discloses a multilayer composite pipe for direct drinking water delivery and a preparation method thereof, wherein the composite pipe mainly comprises the following structures: the inner layer is a polyvinylidene fluoride functional layer, the middle layer is an aluminum layer, and the outer layer is a random copolymerization polypropylene layer; the aluminum layer of the middle layer is connected with the inner layer and the outer layer respectively by adopting inner hot melt adhesive and outer hot melt adhesive. The thickness of the inner layer accounts for 42-45% of the total wall thickness of the composite pipe, the thickness of the aluminum layer of the middle layer accounts for 5-10% of the total wall thickness of the composite pipe, the thickness of the outer layer accounts for 42-45% of the total wall thickness of the composite pipe, and the thickness of the inner hot melt adhesive and the thickness of the outer hot melt adhesive are both controlled within 0.3 mm. The composite pipe can effectively block oxygen, has excellent and continuous antibacterial performance, is acid-base resistant, corrosion resistant and impact resistant, has small water flow resistance and small impurity precipitation in the water delivery process, is tightly bonded with each layer of the composite pipe, has good long-term weather resistance, is simple in production and installation process, is not easy to rebound after being bent, and can effectively guarantee the delivery safety and installation convenience of direct drinking water.

Description

Multilayer composite pipe for direct drinking water conveying and preparation method thereof
Technical Field
The invention relates to the technical field of pipes, in particular to a multilayer composite pipe for direct drinking water conveying and a preparation method thereof.
Background
The existing direct drinking water system mainly adopts ultraviolet disinfection, has no continuous disinfection capability, has concentrated use time, and can stop for a long time in a household pipe for long-distance water delivery, and the characteristics have higher requirements on the stability of a delivery pipe, otherwise, the water outlet quality of a user side can be influenced.
At present, stainless steel pipes, copper pipes and other plastic pipes meeting the sanitary requirements are often selected as the direct drinking water conveying pipes. The metal tube is relatively high in price, and has certain requirements on water quality such as pH value and chloride ion content of water when in use, otherwise, the metal tube still has corrosion risk after being used for a long time. Although the sanitary performance of the traditional plastic pipe such as a random polypropylene (PPR) pipe meets the requirement, microorganisms and even seaweed are easy to breed on the inner wall of the traditional plastic pipe after long-term use, and the safety of drinking water is influenced.
The direct drinking water has higher requirements on water quality, so the selection of the material of the pipe is very important. Polyvinylidene fluoride (PVDF) is used as a novel thermoplastic plastic, has excellent acid and alkali resistance and corrosion resistance, and excellent impact resistance, abrasion resistance and creep property, can reach the temperature of-40-150 ℃ after being used for a long time, and simultaneously effectively reduces water flow resistance, pressure loss of pipelines and water delivery energy consumption due to the smooth inner surface, so the PVDF is often used as a delivery pipeline for delivering high-purity water and ultrapure water, and is an ideal material suitable for delivering direct drinking water. But if the water pipe is used as a direct drinking water pipe, the cost is higher, and if the water pipe is used in a long-term and long-distance conveying environment, the water quality is influenced because bacteria are easy to breed due to poor oxygen resistance, and the performance aging problem can occur after the water pipe is exposed outside for a long time.
On the premise of not influencing the use performance, the composite pipeline is prepared by using a material with relatively low price as the outer layer, so that the cost of the pipe can be effectively reduced, and the performance of the pipe is improved. The current patent is, for example, CN20186642U provides a preparation method of a composite pipe, wherein the inner layer is made of polyvinylidene fluoride alloy, the middle oxygen barrier layer and the outer layer are made of random polyolefin materials; CN109253320 provides a preparation method of a composite pipe composed of polyvinylidene fluoride as an inner layer, high-molecular alloy as an intermediate layer and random polyolefin as an outer layer. Although the pipes prepared by the methods have certain self-cleaning function, if the pipes are used for conveying direct drinking water, due to insufficient oxygen resistance, bacteria can be generated if the direct drinking water is left in the pipelines for a long time, and the water quality is polluted. In addition, the alloy material prepared by compounding the polyolefin, the fluoroolefin and other materials mentioned in the patent has poor compatibility with the polyolefin material, the stability of a compounding system needs to be studied, and the layers of the compounding pipe can fall off after long-term use, so that the integral strength of the pipe is influenced. Meanwhile, if the prepared alloy material is used as the inner layer of the composite pipe, micromolecules are easy to separate out, and the water quality is further influenced. The composite pipe has the technical problems of high rigidity, difficulty in bending, easiness in springback after bending, need of more joints and elbows during actual installation and increase of working hours and material cost.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide a multilayer composite pipe for direct drinking water conveying and a preparation method thereof.
The multi-layer composite pipe for direct drinking water delivery is characterized by mainly comprising the following structures: the inner layer is a polyvinylidene fluoride functional layer, the middle layer is an aluminum layer, and the outer layer is a random copolymerization polypropylene layer; the aluminum layer of the middle layer is connected with the inner layer and the outer layer respectively by adopting inner hot melt adhesive and outer hot melt adhesive.
The multilayer composite pipe for direct drinking water conveying is characterized in that the thickness of the inner layer accounts for 42-50% of the total wall thickness of the composite pipe, the thickness of the aluminum layer of the middle layer accounts for 5-10% of the total wall thickness of the composite pipe, the thickness of the outer layer accounts for 42-50% of the total wall thickness of the composite pipe, and the thickness of the inner hot melt adhesive and the thickness of the outer hot melt adhesive are both controlled within 0.3 mm.
The multilayer composite pipe for direct drinking water conveying is characterized in that the preparation raw materials of the inner polyvinylidene fluoride functional layer comprise the following components in parts by weight: 100 parts of polyvinylidene fluoride resin PVDF, 0.5-2 parts of silane coupling agent and 0.5-2 parts of antibacterial agent;
the preparation raw materials of the outer layer random copolymerization polypropylene layer comprise the following components in parts by weight: 100 parts of random copolymerization polypropylene resin PPR and 0.5-1 part of antioxidant;
the preparation raw materials of the internal hot melt adhesive comprise the following components in parts by weight: 100 parts of polyvinylidene fluoride resin, 4-8 parts of grafting monomer, 2-4 parts of initiator and 3-5 parts of diluent;
the raw material for preparing the external hot melt adhesive is polyolefin hot melt adhesive.
The multilayer composite pipe for direct drinking water delivery is characterized in that a silane coupling agent is KH-550, and an antibacterial agent is inorganic nano-silver; the grafting monomer is maleic anhydride, the antioxidant is antioxidant 330, the initiator is dicumyl peroxide (DCP), and the diluent is epoxy diluent 868.
The preparation method of the multilayer composite pipe for direct drinking water delivery is characterized by comprising the following steps:
s1 preparation of inner layer antibacterial master batch: uniformly stirring and mixing the silane coupling agent and the antibacterial agent, then putting the mixture and polyvinylidene fluoride resin PVDF into a high-stirring machine to be stirred for 15-30min, and then extruding and granulating by using a double-screw extruder at the extrusion temperature of 200 ℃ and 230 ℃ to prepare inner-layer antibacterial master batch;
preparation of hot melt adhesive raw material in S2: uniformly mixing polyvinylidene fluoride resin, a grafting monomer, an initiator and a diluent according to the weight ratio of the raw materials, and then extruding and granulating the uniform material by using a reaction extruder, wherein the temperature of a machine barrel is 190-220 ℃, the temperature of a machine head is 190-220 ℃, and the temperature of a melt is less than or equal to 220 ℃;
preparation of S3 outer layer material: placing the polypropylene random copolymer resin and the antioxidant into a high-speed stirrer according to the weight ratio of the raw materials, and stirring for 15-30min to obtain an outer layer material for later use;
s4 composite pipe extrusion molding: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the inner hot melt adhesive raw material, and an inner-layer polyvinylidene fluoride functional layer and the inner hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and an outer layer random copolymerization polypropylene layer and an outer hot melt adhesive are extruded in a double-layer co-extrusion mode;
firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner polyvinylidene fluoride functional layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer random copolymerization polypropylene layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
The preparation method for the multilayer composite pipe for direct drinking water conveying is characterized in that an extruder for extruding the inner layer and the outer layer is equally divided into 6 heating sections, wherein the temperature of each section of a machine barrel of the extruder for extruding the inner layer is as follows: the heating temperature of 1 section is 200 +/-5 ℃, the heating temperature of 2 sections is 205 +/-5 ℃, the heating temperature of 3 sections is 210 +/-5 ℃, the heating temperature of 4 sections is 215 +/-5 ℃, the heating temperature of 5 sections is 220 +/-5 ℃, and the heating temperature of 6 sections is 225 +/-5 ℃; the temperatures of the extruder barrel sections for the outer layer extrusion were: the heating temperature of 1 section is 190 +/-5 ℃, the heating temperature of 2 sections is 195 +/-5 ℃, the heating temperature of 3 sections is 200 +/-5 ℃, the heating temperature of 4 sections is 205 +/-5 ℃, the heating temperature of 5 sections is 210 +/-5 ℃, and the heating temperature of 6 sections is 215 +/-5 ℃.
The preparation method for the multilayer composite pipe for direct drinking water delivery is characterized in that an extruder for extruding the internal hot melt adhesive and the external hot melt adhesive is equally divided into 4 heating sections, and the temperature of each section of a machine barrel of the extruder for extruding the internal hot melt adhesive is as follows: the heating temperature of 1 section is 205 +/-5 ℃, the heating temperature of 2 sections is 210 +/-5 ℃, the heating temperature of 3 sections is 215 +/-5 ℃, and the heating temperature of 4 sections is 220 +/-5 ℃; the temperature of each section of the machine barrel of the extruder for extruding the external hot melt adhesive is as follows: the heating temperature of the 1 section is 195 +/-5 ℃, the heating temperature of the 2 section is 200 +/-5 ℃, the heating temperature of the 3 section is 205 +/-5 ℃, and the heating temperature of the 4 section is 210 +/-5 ℃.
The beneficial effects obtained by the invention are as follows:
the composite pipe can effectively block oxygen, has excellent and continuous antibacterial performance, is acid-base resistant, corrosion resistant and impact resistant, has small water flow resistance and small impurity precipitation in the water delivery process, is tightly bonded with each layer of the composite pipe, has good long-term weather resistance, is simple in production and installation process, is not easy to rebound after being bent, and can effectively guarantee the delivery safety and installation convenience of direct drinking water.
Drawings
FIG. 1 is a schematic structural view of a composite pipe of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b):
referring to fig. 1, the multilayer composite pipe for direct drinking water delivery has a structure comprising an inner polyvinylidene fluoride functional layer 1, an inner hot melt adhesive 2, an intermediate aluminum layer 3, an outer hot melt adhesive 4 and an outer random copolymer polypropylene layer 5 from inside to outside in sequence.
The polyvinylidene fluoride (PVDF) resin in the multilayer composite pipe designed by the invention is purchased from extrusion-grade polyvinylidene fluoride of the commercial Akema company; random copolymerized polypropylene (PPR) resin is available from basel corporation and polyolefin hot melt adhesive resin is available from mitsui chemical company, japan. The aluminum tape used was assigned the designation 8011, state O.
Example 1:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: selecting 100 parts of polyvinylidene fluoride resin, 0.5 part of silane coupling agent (KH550) and 0.5 part of nano-silver antibacterial agent as inner layer materials, uniformly stirring the silane coupling agent (KH550) and the nano-silver antibacterial agent, uniformly mixing the mixture with the polyvinylidene fluoride resin, and then granulating by using a double-screw extruder at the extrusion temperature of 200 ℃ to prepare inner layer antibacterial master batch;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 4 parts of graft monomer Maleic Anhydride (MAH), 2 parts of initiator dicumyl peroxide (DCP) and 3 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding the materials by using a reaction extruder for granulation, wherein the temperature of a machine barrel is 190 ℃ and the temperature of a machine head is 190 ℃;
preparation of S3 outer layer material: 100 parts of random copolymer polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-stirring machine together for uniform mixing for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Example 2:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: the inner layer material is prepared from 100 parts of polyvinylidene fluoride resin, 1 part of silane coupling agent (KH550) and 1 part of nano-silver antibacterial agent, the silane coupling agent (KH550) and the nano-silver antibacterial agent are uniformly stirred and mixed, then the mixture is fully and uniformly mixed with the polyvinylidene fluoride resin, and then a double-screw extruder is used for granulation, the extrusion temperature is 200 ℃, and inner layer antibacterial master batch is prepared;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 6 parts of graft monomer Maleic Anhydride (MAH), 3 parts of initiator dicumyl peroxide (DCP) and 4 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding the materials by using a reaction extruder for granulation, wherein the temperature of a machine barrel is 190 ℃ and the temperature of a machine head is 190 ℃;
preparation of S3 outer layer material: 100 parts of random copolymer polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-stirring machine together for uniform mixing for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Example 3:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: the inner layer material is prepared from 100 parts of polyvinylidene fluoride resin, 2 parts of silane coupling agent (KH550) and 2 parts of nano-silver antibacterial agent, the silane coupling agent (KH550) and the nano-silver antibacterial agent are uniformly stirred and mixed, then the mixture is fully and uniformly mixed with the polyvinylidene fluoride resin, and then a double-screw extruder is used for granulation, the extrusion temperature is 200 ℃, and inner layer antibacterial master batch is prepared;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 8 parts of graft monomer Maleic Anhydride (MAH), 4 parts of initiator dicumyl peroxide (DCP) and 5 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding the materials by using a reaction extruder for granulation, wherein the temperature of a machine barrel is 190 ℃ and the temperature of a machine head is 190 ℃;
preparation of S3 outer layer material: 100 parts of random copolymer polypropylene and 1 part of antioxidant (330) are selected as outer layer materials and put into a high-speed stirrer together to be uniformly mixed for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Example 4:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: the inner layer material is prepared from 100 parts of polyvinylidene fluoride resin, 0.5 part of silane coupling agent (KH550) and 1 part of nano-silver antibacterial agent, the silane coupling agent (KH550) and the nano-silver antibacterial agent are uniformly stirred and mixed, then the mixture is fully and uniformly mixed with the polyvinylidene fluoride resin, and then the mixture is granulated by a double-screw extruder at the extrusion temperature of 210 ℃ to obtain inner layer antibacterial master batch;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 8 parts of graft monomer Maleic Anhydride (MAH), 3 parts of initiator dicumyl peroxide (DCP) and 4 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding the materials by using a reaction extruder for granulation, wherein the temperature of a machine barrel is 190 ℃ and the temperature of a machine head is 190 ℃;
preparation of S3 outer layer material: 100 parts of random copolymerization polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-speed stirrer together to be uniformly mixed for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Example 5:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: the inner layer material is prepared from 100 parts of polyvinylidene fluoride resin, 0.5 part of silane coupling agent (KH550) and 2 parts of nano-silver antibacterial agent, the silane coupling agent (KH550) and the nano-silver antibacterial agent are uniformly stirred and mixed, then are fully and uniformly mixed with the polyvinylidene fluoride resin, and then are granulated by a double-screw extruder, wherein the extrusion temperature is 210 ℃;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 8 parts of graft monomer Maleic Anhydride (MAH), 3 parts of initiator dicumyl peroxide (DCP) and 4 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding and granulating by using a reaction extruder, wherein the temperature of a machine barrel is 200 ℃, and the temperature of a machine head is 200 ℃;
preparation of S3 outer layer material: 100 parts of random copolymer polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-stirring machine together for uniform mixing for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Example 6:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: the inner layer material is prepared from 100 parts of polyvinylidene fluoride resin, 1 part of silane coupling agent (KH550) and 2 parts of nano-silver antibacterial agent, the silane coupling agent (KH550) and the nano-silver antibacterial agent are uniformly stirred and mixed, then the mixture is fully and uniformly mixed with the polyvinylidene fluoride resin, and then a double-screw extruder is used for granulation, the extrusion temperature is 210 ℃, and inner layer antibacterial master batch is prepared;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 8 parts of graft monomer Maleic Anhydride (MAH), 3 parts of initiator dicumyl peroxide (DCP) and 4 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding the materials by using a reaction extruder for granulation, wherein the barrel temperature is 210 ℃, and the head temperature is 210 ℃;
preparation of S3 outer layer material: 100 parts of random copolymerization polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-speed stirrer together to be uniformly mixed for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Example 7:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
s1 preparation of inner layer antibacterial master batch: the inner layer material is prepared from 100 parts of polyvinylidene fluoride resin, 1 part of silane coupling agent (KH550) and 2 parts of nano-silver antibacterial agent, the silane coupling agent (KH550) and the nano-silver antibacterial agent are uniformly stirred and mixed, then are fully and uniformly mixed with the polyvinylidene fluoride resin, and then are granulated by a double-screw extruder, wherein the extrusion temperature is 220 ℃;
preparation of hot melt adhesive raw material in S2: the internal hot melt adhesive material is prepared by selecting 100 parts of polyvinylidene fluoride resin, 8 parts of graft monomer Maleic Anhydride (MAH), 3 parts of initiator dicumyl peroxide (DCP) and 4 parts of diluent epoxy diluent (868), uniformly mixing the materials, and then extruding the materials by using a reaction extruder for granulation, wherein the barrel temperature is 220 ℃, and the head temperature is 220 ℃;
preparation of S3 outer layer material: 100 parts of random copolymer polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-stirring machine together for uniform mixing for later use;
the outer hot melt adhesive material is prepared from 100 parts of three-well polyolefin hot melt adhesive resin;
preparation of S4 composite tube: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the internal hot melt adhesive raw material, and the inner layer and the internal hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Comparative example 1:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
100 parts of random copolymer polypropylene is selected as an inner layer material; 100 parts of random copolymer polypropylene and 0.5 part of antioxidant (330) are selected as outer layer materials and put into a high-stirring machine together for uniform mixing for later use; 100 parts of three-well polyolefin hot melt adhesive resin is selected as the inner hot melt adhesive material and the outer hot melt adhesive material;
firstly, welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, adopting 4 extruders, respectively adding an inner layer material and an inner hot melt adhesive material into 2 extruders, and extruding the inner layer and the inner hot melt adhesive in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
Comparative example 2:
the preparation method of the multilayer composite pipe for direct drinking water delivery comprises the following steps in parts by weight:
100 parts of polyvinylidene fluoride resin is selected as an inner layer material; 100 parts of random copolymerization polypropylene and 0.5 part of antioxidant (330) are selected as an outer layer and put into a high-speed stirrer together to be uniformly mixed for later use; 100 parts of three-well polyolefin hot melt adhesive resin is selected as the inner hot melt adhesive material and the outer hot melt adhesive material;
firstly, welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, adopting 4 extruders, respectively adding an inner layer material and an inner hot melt adhesive material into 2 extruders, and extruding the inner layer and the inner hot melt adhesive in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive material are respectively added into 2 extruders, and the outer layer and the outer hot melt adhesive are extruded in a double-layer co-extrusion mode. Firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
In the preparation process of the composite tubes of the above examples 1 to 7 and comparative examples 1 to 2, the following operating conditions were adopted for the extrusion of the inner layer and the outer layer: the extruders for extruding the inner layer and the outer layer are equally divided into 6 heating sections, wherein the temperature of each section of the machine cylinder of the extruder for extruding the inner layer is as follows: the heating temperature of 1 section is 200 +/-5 ℃, the heating temperature of 2 sections is 205 +/-5 ℃, the heating temperature of 3 sections is 210 +/-5 ℃, the heating temperature of 4 sections is 215 +/-5 ℃, the heating temperature of 5 sections is 220 +/-5 ℃, and the heating temperature of 6 sections is 225 +/-5 ℃; the temperatures of the extruder barrel sections for the outer layer extrusion were: the heating temperature of 1 section is 190 +/-5 ℃, the heating temperature of 2 sections is 195 +/-5 ℃, the heating temperature of 3 sections is 200 +/-5 ℃, the heating temperature of 4 sections is 205 +/-5 ℃, the heating temperature of 5 sections is 210 +/-5 ℃, and the heating temperature of 6 sections is 215 +/-5 ℃.
In the preparation process of the composite pipes of the above examples 1 to 7 and comparative examples 1 to 2, the following operating conditions were adopted for the extrusion of the internal hot melt adhesive and the external hot melt adhesive: the extruder for extruding the internal hot melt adhesive and the external hot melt adhesive is equally divided into 4 heating sections, and the temperature of each section of the machine barrel of the extruder for extruding the internal hot melt adhesive is as follows: the heating temperature of 1 section is 205 +/-5 ℃, the heating temperature of 2 sections is 210 +/-5 ℃, the heating temperature of 3 sections is 215 +/-5 ℃, and the heating temperature of 4 sections is 220 +/-5 ℃; the temperature of each section of the machine barrel of the extruder for extruding the external hot melt adhesive is as follows: the heating temperature of the 1 section is 195 +/-5 ℃, the heating temperature of the 2 section is 200 +/-5 ℃, the heating temperature of the 3 section is 205 +/-5 ℃, and the heating temperature of the 4 section is 210 +/-5 ℃.
The composite pipes of examples 1 to 7 and comparative examples 1 to 2 described above were: the nominal outer diameter is 20mm, the total wall thickness is 1.9mm, the outer layer thickness is controlled to be 42-45%, the middle layer aluminum layer thickness accounts for 5-10% of the total wall thickness of the composite pipe, the inner layer thickness accounts for 42-45% of the total wall thickness of the composite pipe, and the thicknesses of the inner hot melt adhesive and the outer hot melt adhesive are controlled within 0.2 mm.
Application example 1:
the composite pipes prepared in the above examples 1 to 7 and comparative examples 1 to 2 were respectively subjected to performance tests, and the test results are shown in tables 1 and 2.
And (3) performing a pipe ring radial tension test, a pipe ring minimum average peeling force test, a bursting test, a hydrostatic pressure strength test and a cold and hot water circulation test on the sample pipe by referring to a GB/T18997.1-2003 test method.
The antibacterial effect of the sample tube is tested by referring to JC/T939-2004 to judge the antibacterial effect, and experimental strains are selected from escherichia coli and staphylococcus aureus.
The sample tubes were tested for hygiene performance with reference to GB/T17219-1998.
And (3) performing a bending test on the sample tube by referring to a device B6.1 in a GB/T5565.1-2017 method, so that the bending radian of the tube is 90 degrees, and observing whether the tube body has the phenomena of springback, kinking, breaking and the like after the bending test is finished.
Table 1 composite tube performance testing
Figure BDA0003009962480000141
Figure BDA0003009962480000151
Table 2 composite tube performance testing prepared
Figure BDA0003009962480000152
Figure BDA0003009962480000161
The multilayer composite pipe for direct drinking water conveying can effectively block oxygen, has excellent and continuous antibacterial performance, is acid-base resistant, corrosion resistant and impact resistant, has small water flow resistance and small precipitation in the water conveying process, is tightly bonded with each layer of the composite pipe, has good long-term weather resistance, is mature in pipeline processing technology, can be transported by a coil pipe, is simple in installation process, can be continuously laid and automatically bent, and effectively ensures the safety of direct drinking water conveying.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.

Claims (7)

1. The utility model provides a be used for straight drinking water to carry multilayer composite pipe which characterized in that mainly includes following structure: the inner layer is a polyvinylidene fluoride functional layer, the middle layer is an aluminum layer, and the outer layer is a random copolymerization polypropylene layer; the aluminum layer of the middle layer is connected with the inner layer and the outer layer respectively by adopting inner hot melt adhesive and outer hot melt adhesive.
2. The multilayer composite pipe for direct drinking water delivery as claimed in claim 1, wherein the thickness of the inner layer accounts for 42-50% of the total wall thickness of the composite pipe, the thickness of the aluminum layer of the middle layer accounts for 5-10% of the total wall thickness of the composite pipe, the thickness of the outer layer accounts for 42-50% of the total wall thickness of the composite pipe, and the thickness of the inner hot melt adhesive and the outer hot melt adhesive are both controlled within 0.3 mm.
3. The multilayer composite pipe for direct drinking water conveying as claimed in claim 1, wherein the preparation raw material of the inner polyvinylidene fluoride functional layer comprises the following components in parts by weight: 100 parts of polyvinylidene fluoride resin PVDF, 0.5-2 parts of silane coupling agent and 0.5-2 parts of antibacterial agent;
the preparation raw materials of the outer layer random copolymerization polypropylene layer comprise the following components in parts by weight: 100 parts of random copolymerization polypropylene resin PPR and 0.5-1 part of antioxidant;
the preparation raw materials of the internal hot melt adhesive comprise the following components in parts by weight: 100 parts of polyvinylidene fluoride resin, 4-8 parts of grafting monomer, 2-4 parts of initiator and 3-5 parts of diluent;
the raw material for preparing the external hot melt adhesive is polyolefin hot melt adhesive.
4. The multi-layer composite pipe for direct drinking water delivery according to claim 3, wherein the silane coupling agent is KH-550, and the antibacterial agent is inorganic nano-silver; the grafting monomer is maleic anhydride, the antioxidant is antioxidant 330, the initiator is dicumyl peroxide (DCP), and the diluent is epoxy diluent 868.
5. The preparation method of the multilayer composite pipe for direct drinking water delivery according to claim 1, characterized by comprising the following steps:
s1 preparation of inner layer antibacterial master batch: uniformly stirring and mixing the silane coupling agent and the antibacterial agent, then putting the mixture and polyvinylidene fluoride resin PVDF into a high-stirring machine to be stirred for 15-30min, and then extruding and granulating by using a double-screw extruder at the extrusion temperature of 200 ℃ and 230 ℃ to prepare inner-layer antibacterial master batch;
preparation of hot melt adhesive raw material in S2: uniformly mixing polyvinylidene fluoride resin, a grafting monomer, an initiator and a diluent according to the weight ratio of the raw materials, and then extruding and granulating the uniform material by using a reaction extruder, wherein the temperature of a machine barrel is 190-220 ℃, the temperature of a machine head is 190-220 ℃, and the temperature of a melt is less than or equal to 220 ℃;
preparation of S3 outer layer material: placing the polypropylene random copolymer resin and the antioxidant into a high-speed stirrer according to the weight ratio of the raw materials, and stirring for 15-30min to obtain an outer layer material for later use;
s4 composite pipe extrusion molding: 4 extruders are adopted, wherein 2 extruders are respectively added with the inner-layer antibacterial master batch and the inner hot melt adhesive raw material, and an inner-layer polyvinylidene fluoride functional layer and the inner hot melt adhesive are extruded in a double-layer co-extrusion mode; in addition, an outer layer material and an outer hot melt adhesive raw material are respectively added into 2 extruders, and an outer layer random copolymerization polypropylene layer and an outer hot melt adhesive are extruded in a double-layer co-extrusion mode;
firstly welding an aluminum strip into an aluminum alloy pipe by using an ultrasonic welding machine, then adhering an inner polyvinylidene fluoride functional layer and an inner hot melt adhesive inside the aluminum alloy pipe by using a co-extrusion lining plastic mode through the same extrusion die head, covering an outer random copolymerization polypropylene layer and an outer hot melt adhesive on the outer surface of the aluminum alloy pipe by using a co-extrusion coating mode through the same extrusion die head, then cooling and shaping, collecting to obtain a composite pipe, and drawing the composite pipe to advance under the action of a tractor in the whole process.
6. The preparation method of the multilayer composite pipe for direct drinking water conveying as claimed in claim 5, wherein the extruders for the inner layer and the outer layer are divided into 6 heating sections, wherein the temperatures of the sections of the extruder cylinder for the inner layer extrusion are as follows: the heating temperature of 1 section is 200 +/-5 ℃, the heating temperature of 2 sections is 205 +/-5 ℃, the heating temperature of 3 sections is 210 +/-5 ℃, the heating temperature of 4 sections is 215 +/-5 ℃, the heating temperature of 5 sections is 220 +/-5 ℃, and the heating temperature of 6 sections is 225 +/-5 ℃; the temperatures of the extruder barrel sections for the outer layer extrusion were: the heating temperature of 1 section is 190 +/-5 ℃, the heating temperature of 2 sections is 195 +/-5 ℃, the heating temperature of 3 sections is 200 +/-5 ℃, the heating temperature of 4 sections is 205 +/-5 ℃, the heating temperature of 5 sections is 210 +/-5 ℃, and the heating temperature of 6 sections is 215 +/-5 ℃.
7. The preparation method of the multilayer composite pipe for direct drinking water delivery as claimed in claim 5, wherein the extruders for internal and external hot melt adhesives extrusion are equally divided into 4 heating sections, and the temperatures of the sections of the extruder barrel for internal hot melt adhesive extrusion are as follows: the heating temperature of 1 section is 205 +/-5 ℃, the heating temperature of 2 sections is 210 +/-5 ℃, the heating temperature of 3 sections is 215 +/-5 ℃, and the heating temperature of 4 sections is 220 +/-5 ℃; the temperature of each section of the machine barrel of the extruder for extruding the external hot melt adhesive is as follows: the heating temperature of the 1 section is 195 +/-5 ℃, the heating temperature of the 2 section is 200 +/-5 ℃, the heating temperature of the 3 section is 205 +/-5 ℃, and the heating temperature of the 4 section is 210 +/-5 ℃.
CN202110372838.3A 2021-04-07 2021-04-07 Multilayer composite pipe for direct drinking water conveying and preparation method thereof Pending CN113232373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110372838.3A CN113232373A (en) 2021-04-07 2021-04-07 Multilayer composite pipe for direct drinking water conveying and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110372838.3A CN113232373A (en) 2021-04-07 2021-04-07 Multilayer composite pipe for direct drinking water conveying and preparation method thereof

Publications (1)

Publication Number Publication Date
CN113232373A true CN113232373A (en) 2021-08-10

Family

ID=77131000

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110372838.3A Pending CN113232373A (en) 2021-04-07 2021-04-07 Multilayer composite pipe for direct drinking water conveying and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113232373A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104653884A (en) * 2015-03-16 2015-05-27 福建澳工塑胶电器有限公司 Antibacterial composite water supply pipe and preparation method thereof
CN206130323U (en) * 2016-08-31 2017-04-26 浙江中财管道科技股份有限公司 Stable state pipe with self -cleaning function
CN109253320A (en) * 2018-08-23 2019-01-22 浙江巨化新材料研究院有限公司 A kind of MULTILAYER COMPOSITE tubing and preparation method thereof
CN111765300A (en) * 2020-06-16 2020-10-13 临海伟星新型建材有限公司 Barrier composite pipe and preparation method thereof
CN112377683A (en) * 2020-12-01 2021-02-19 上海伟星新型建材有限公司 Antibacterial anti-scaling high-temperature-resistant aluminum-plastic composite pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104653884A (en) * 2015-03-16 2015-05-27 福建澳工塑胶电器有限公司 Antibacterial composite water supply pipe and preparation method thereof
CN206130323U (en) * 2016-08-31 2017-04-26 浙江中财管道科技股份有限公司 Stable state pipe with self -cleaning function
CN109253320A (en) * 2018-08-23 2019-01-22 浙江巨化新材料研究院有限公司 A kind of MULTILAYER COMPOSITE tubing and preparation method thereof
CN111765300A (en) * 2020-06-16 2020-10-13 临海伟星新型建材有限公司 Barrier composite pipe and preparation method thereof
CN112377683A (en) * 2020-12-01 2021-02-19 上海伟星新型建材有限公司 Antibacterial anti-scaling high-temperature-resistant aluminum-plastic composite pipe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
左继成等: "《高分子材料成型加工基本原理及工艺》", 31 January 2017 *

Similar Documents

Publication Publication Date Title
CN103205228B (en) A kind of preparation method of hot-melt adhesive for multilayer oxygen-resistance pipe
CN109253320B (en) Multilayer composite pipe and preparation method thereof
CN109721912B (en) Barrier layer, multilayer plastic composite pipe and preparation method
CN106589585A (en) High strength polypropylene (PP-HM) double-wall corrugated pipe and production technology
CN109291525A (en) The polypropylene random copolymer composite tube and preparation method of fiber reinforcement beta crystal
CN110103554A (en) A kind of PPR pipe and preparation method thereof for the antibacterial high intensity that resists cold
CN100455866C (en) Pipeline of polar polymer and poleless polymer composing with metal reinforcement
CN112377683A (en) Antibacterial anti-scaling high-temperature-resistant aluminum-plastic composite pipe
CN102705591B (en) Heat-resistant and pressure-resistant polyethylene composite pipe
CN102767652B (en) Heat-resisting polyethylene composite pipe and preparation method thereof
CN113232373A (en) Multilayer composite pipe for direct drinking water conveying and preparation method thereof
CN101699119A (en) Ultra high molecular weight polyethylene and polyvinyl chloride composite pipe embedded with reinforced steel filaments and manufacturing method thereof
CN107166112B (en) Flexible composite pipe and preparation method thereof
CN108586940A (en) A kind of preparation method of the weather-proof uvioresistant PP-R pipes of outdoor use
CN105001637A (en) High polymer material for pipeline and preparation method of high polymer material
CN105330929A (en) Double-wall corrugated pipe and preparation method thereof
CN108017818A (en) A kind of ant-scaling random polypropylene and modified ultra-high molecular weight polyethylene multiple tube
CN104534195B (en) A kind of composite soft tube and its manufacturing method
CN103275274A (en) Method for producing silane crosslinked polyethylene hot water flexible tubes through one-step process of single screw extruder
CN208327884U (en) A kind of wear-resisting PPR pipe
CN101699120B (en) Microporous plastic-covered PPR copper liner reinforced composite pipe and preparation method thereof
CN109021405A (en) A kind of PPR pipe and its preparation method and application of high intensity high/low temperature toughness
CN100455867C (en) Pipeline of composing metal with polythene
CN110901005B (en) Oxygen-blocking and scale-preventing composite pipe and preparation method thereof
CN216813208U (en) High temperature resistant, hinder oxygen and antibiotic anti-scaling PPR composite pipe

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210810

RJ01 Rejection of invention patent application after publication