CN106947146B - Trenchless special pipe and preparation method thereof - Google Patents

Trenchless special pipe and preparation method thereof Download PDF

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CN106947146B
CN106947146B CN201710271876.3A CN201710271876A CN106947146B CN 106947146 B CN106947146 B CN 106947146B CN 201710271876 A CN201710271876 A CN 201710271876A CN 106947146 B CN106947146 B CN 106947146B
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pipe body
body layer
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CN106947146A (en
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叶翀
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Zhejiang Obo Pipe Industry Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/04—Pipes or fittings specially adapted to sewers
    • 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
    • F16L11/005—Hoses, i.e. flexible pipes consisting completely or partially of material other than fibres, plastics or metal
    • 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
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/068—Ultra high molecular weight polyethylene

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a trenchless special pipe and a preparation method thereof, wherein the trenchless special pipe comprises an outer pipe body layer and an inner pipe body layer, the outer pipe body layer is made of PP (polypropylene) material with the thickness of 3-8 mm, the inner pipe body layer is made of PE (polyethylene) composite material with the thickness of 6-10 mm, and the PE composite material comprises high-density polyethylene, low-density polyethylene, ultrahigh-molecular-weight polyethylene fiber, polyurethane microcapsules containing isocyanate, surface modified kaolin and an antioxidant. The pipe material provided by the invention has excellent mechanical properties and self-healing capability.

Description

Trenchless special pipe and preparation method thereof
Technical Field
The invention relates to a trenchless special pipe and a preparation method thereof.
Background
The modern non-excavation pipeline engineering technology is a technical revolution for traditional excavation construction, underground pipeline construction can be carried out under the conditions of not damaging roads and vegetation and not influencing the environment and traffic, the difficult problem of laying pipelines under railways, rivers and existing buildings is effectively solved, the method has important application value for development, upgrading and reconstruction of industries such as electric power, communication, building water supply and drainage and the like, and the economic and social significance is remarkable. As the trenchless pipeline technology has the advantages, the trenchless pipeline technology is developed rapidly and has wide application at home and abroad.
The existing trenchless pipe materials mainly comprise polyethylene, polypropylene, polyvinyl chloride, ABS and the like. These pipes which are not specially treated tend to have a short service life and are subject to high maintenance costs due to the environment and method in which they are used.
Disclosure of Invention
The invention mainly aims to provide a trenchless special pipe which has certain self-healing capacity and is particularly suitable for being used as a drainage pipeline.
In order to achieve the purpose, the invention provides a trenchless special pipe, which comprises an outer pipe body layer and an inner pipe body layer, wherein the outer pipe body layer is made of PP (polypropylene) material with the thickness of 3-8 mm, the inner pipe body layer is made of PE (polyethylene) composite material with the thickness of 6-10 mm, and the PE composite material comprises high-density polyethylene, low-density polyethylene, ultrahigh-molecular-weight polyethylene fiber, polyurethane microcapsules containing isocyanate, surface modified kaolin and an antioxidant.
The wear resistance and the scratch resistance of the PP material are superior to those of the PE material, so that the pipe is not easy to scratch in the pipe penetrating process, and the pipe is designed into a two-layer structure, which is favorable for prolonging the service life of the pipe.
The polyurethane microcapsule containing isocyanate is a microsphere which is prepared based on interfacial polymerization and has a shell layer of polyurethane and an interior of isocyanate, and the particle size of the microsphere is 100-400 mu m. The microcapsules are uniformly distributed in the matrix, when cracks occur in the material, the polyurethane spherical shell is broken, the isocyanate stored in the polyurethane spherical shell flows out through capillary action to react with external water molecules, and the generated product is filled in the cracks to reconnect the broken surfaces of the material, so that the self-healing of the microcracks in the material is realized.
The surface modified kaolin is titanate modified kaolin. Titanate is a common coupling agent, and the action mechanism of the titanate is to form a monomolecular coating film on the surface of kaolin particles, so that the surface property of the kaolin particles is radically changed, the original hydrophilicity of a filler is changed, the dispersibility and the flowability of the filler during processing are improved, the filling amount is improved, the resin consumption is reduced, the product cost is reduced, the processing performance is improved, the product gloss is increased, the strength, the impact property and the flame retardant property of a composite material are improved, and the product quality is improved.
The ultra-high molecular weight polyethylene (PE-UHMW) fiber is a high-performance organic fiber which appears after carbon fiber and aramid fiber, has the characteristics of low density, high modulus and high strength, and the composite material of the ultra-high molecular weight polyethylene (PE-UHMW) fiber has better mechanical property. Because the polyethylene in the matrix is the same as the reinforced fiber, the reinforced fiber and the matrix are combined very tightly, the compatibility is excellent, and no interface can be achieved. In addition, when the pipe generates cracks, the reinforcing fibers have the function of preventing the cracks from expanding and also have the auxiliary function on the self-healing of the pipe.
Preferably, the surface-modified kaolin is prepared by: preheating a high-speed mixer to the temperature of 60-80 ℃, pouring kaolin into the high-speed mixer to be stirred for 10-20 min at the rotating speed of 500-1000 r/min, and pouring the titanate coupling agent into the high-speed mixer to be mixed for 10min and then discharging the mixture to obtain the surface modified kaolin.
Preferably, the isocyanate-containing polyurethane microcapsules are prepared by the following method: adding water to prepare 250mL of 3 mass percent gum arabic solution serving as a reaction medium at room temperature, mixing 2.9g of diphenylmethane diisocyanate prepolymer and 8g of isocyanate to obtain a reactant serving as an oil phase, adding the oil phase into the gum arabic solution, stirring for half an hour to obtain a stable emulsion, then putting the emulsion into a constant-temperature water bath, heating the emulsion from room temperature to 70 ℃ at a heating rate of 7 ℃/min, adding 3g of 1, 4-butanediol for preparing an interfacial polymerization system, reacting for 6 hours at 70 ℃, filtering, washing and drying to obtain the microspheres.
The preferred embodiment provided by the invention has excellent mechanical property and self-healing capability.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
The invention provides a trenchless special pipe, which comprises an outer pipe body layer and an inner pipe body layer, wherein the outer pipe body layer is made of PP (polypropylene) materials with the thickness of 3-8 mm, and the inner pipe body layer is made of PE (polyethylene) composite materials with the thickness of 6-10 mm. The PE composite material of the inner layer of the pipe body comprises: high density polyethylene, low density polyethylene, ultra-high molecular weight polyethylene fiber, polyurethane microcapsule containing isocyanate, surface modified kaolin and antioxidant.
The surface modified kaolin is prepared by the following method: preheating a high-speed mixer to the temperature of 60-80 ℃, pouring kaolin into the high-speed mixer to be stirred for 10-20 min at the rotating speed of 500-1000 r/min, and pouring the titanate coupling agent into the high-speed mixer to be mixed for 10min and then discharging the mixture to obtain the surface modified kaolin.
The polyurethane microcapsule containing isocyanate is prepared by the following method: adding water to prepare 250mL of 3 mass percent gum arabic solution serving as a reaction medium at room temperature, mixing 2.9g of diphenylmethane diisocyanate prepolymer and 8g of isocyanate to obtain a reactant serving as an oil phase, adding the oil phase into the gum arabic solution, stirring for half an hour to obtain a stable emulsion, then putting the emulsion into a constant-temperature water bath, heating the emulsion from room temperature to 70 ℃ at a heating rate of 7 ℃/min, adding 3g of 1, 4-butanediol for preparing an interfacial polymerization system, reacting for 6 hours at 70 ℃, filtering, washing and drying to obtain the microspheres.
The preparation method of the pipe belongs to the prior art, the invention is not detailed, the following embodiment is a preparation method of the master batch of the inner layer of the pipe body, and after obtaining the master batch, a person in the field can prepare the inner layer of the pipe body according to the prior art.
Example 1
A PE composite was prepared by the following steps:
(1) weighing 100 parts by mass of high-density polyethylene, 50 parts by mass of low-density polyethylene, 10 parts by mass of ultrahigh molecular weight polyethylene fiber, 20 parts by mass of polyurethane microcapsule containing isocyanate, 50 parts by mass of surface modified kaolin and 3 parts by mass of antioxidant;
(2) the raw materials are sequentially added into a low-speed mixing device to be fully mixed for 5min, and the mixed raw materials are extruded and processed to prepare the master batch.
Comparative example 1
A PE composite was prepared by the following steps:
(1) weighing 100 parts by mass of high-density polyethylene, 50 parts by mass of low-density polyethylene, 10 parts by mass of ultrahigh molecular weight polyethylene fiber, 50 parts by mass of surface modified kaolin and 3 parts by mass of antioxidant;
(2) the raw materials are sequentially added into a low-speed mixing device to be fully mixed for 5min, and the mixed raw materials are extruded and processed to prepare the master batch.
Comparative example 2
(1) Weighing 100 parts by mass of high-density polyethylene, 50 parts by mass of low-density polyethylene, 10 parts by mass of ultrahigh molecular weight polyethylene fiber, 10 parts by mass of polyurethane microcapsule containing isocyanate, 50 parts by mass of surface modified kaolin and 3 parts by mass of antioxidant;
(2) the raw materials are sequentially added into a low-speed mixing device to be fully mixed for 5min, and the mixed raw materials are extruded and processed to prepare the master batch.
Comparative example 3
(1) Weighing 100 parts by mass of high-density polyethylene, 50 parts by mass of low-density polyethylene, 10 parts by mass of ultrahigh molecular weight polyethylene fiber, 20 parts by mass of polyurethane microcapsule containing isocyanate and 3 parts by mass of antioxidant;
(2) the raw materials are sequentially added into a low-speed mixing device to be fully mixed for 5min, and the mixed raw materials are extruded and processed to prepare the master batch.
Comparative example 4
A PE composite was prepared by the following steps:
(1) weighing 100 parts by mass of high-density polyethylene, 50 parts by mass of low-density polyethylene, 20 parts by mass of polyurethane microcapsule containing isocyanate, 50 parts by mass of surface modified kaolin and 3 parts by mass of antioxidant;
(2) the raw materials are sequentially added into a low-speed mixing device to be fully mixed for 5min, and the mixed raw materials are extruded and processed to prepare the master batch.
The master batches obtained in example 1 and comparative examples 1 to 4 were prepared into corresponding test specimens for performance testing, and the test items and results are shown in table 1.
TABLE 1
Figure BDA0001277627430000041
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (1)

1. The trenchless special pipe is characterized by comprising an outer pipe body layer and an inner pipe body layer, wherein the outer pipe body layer is made of PP (polypropylene) materials with the thickness of 3-8 mm, the inner pipe body layer is made of PE (polyethylene) composite materials with the thickness of 6-10 mm, the PE composite materials comprise 100 parts by mass of high-density polyethylene, 50 parts by mass of low-density polyethylene, 10 parts by mass of ultra-high molecular weight polyethylene fibers, 20 parts by mass of polyurethane microcapsules containing isocyanate, 50 parts by mass of surface modified kaolin and 3 parts by mass of antioxidant, the raw materials are sequentially added into low-speed mixing equipment to be fully mixed for 5min, and the mixed raw materials are extruded and processed to prepare master batches;
wherein the surface modified kaolin is prepared by the following method: preheating a high-speed mixer to the temperature of 60-80 ℃, pouring kaolin into the high-speed mixer to be stirred for 10-20 min at the rotating speed of 500-1000 r/min, and pouring a titanate coupling agent into the high-speed mixer to be mixed for 10min and then discharging the mixture to obtain surface-modified kaolin;
the polyurethane microcapsule containing isocyanate is prepared by the following method: adding water to prepare 250mL of 3 mass percent gum arabic solution serving as a reaction medium at room temperature, mixing 2.9g of diphenylmethane diisocyanate prepolymer and 8g of isocyanate to obtain a reactant serving as an oil phase, adding the oil phase into the gum arabic solution, stirring for half an hour to obtain a stable emulsion, then placing the emulsion in a constant-temperature water bath, heating the emulsion from room temperature to 70 ℃ at a heating rate of 7 ℃/min, adding 3g of 1, 4-butanediol for preparing an interfacial polymerization system, reacting for 6 hours at 70 ℃, filtering, washing and drying to obtain the microspheres.
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