CN112592527A - Polyethylene double-wall corrugated pipe and preparation method thereof - Google Patents

Polyethylene double-wall corrugated pipe and preparation method thereof Download PDF

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Publication number
CN112592527A
CN112592527A CN202011553929.9A CN202011553929A CN112592527A CN 112592527 A CN112592527 A CN 112592527A CN 202011553929 A CN202011553929 A CN 202011553929A CN 112592527 A CN112592527 A CN 112592527A
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China
Prior art keywords
corrugated pipe
wall corrugated
fiber
ethylene bis
stearamide
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Inventor
赵泽旭
商晓刚
张舰
薛世林
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Sichuan Lanchen Pipe Industry Co ltd
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Sichuan Lanchen Pipe Industry Co ltd
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Priority to CN202011553929.9A priority Critical patent/CN112592527A/en
Publication of CN112592527A publication Critical patent/CN112592527A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • 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
    • 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
    • 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)

Abstract

The application relates to the technical field of double-wall corrugated pipes, and particularly discloses a polyethylene double-wall corrugated pipe and a preparation method thereof. A polyethylene double-wall corrugated pipe is prepared from the following raw materials in parts by weight: 100 portions of HDPE, 125 portions, 45 to 65 portions of LDPE, 0.3 to 0.5 portion of coupling agent, 1.5 to 2 portions of defoaming agent, 3 to 6 portions of anti-cracking fiber and 0.5 to 0.9 portion of lubricant; the lubricant comprises liquid paraffin and ethylene bis stearamide/polyurethane compound, and has the advantage of good wear resistance.

Description

Polyethylene double-wall corrugated pipe and preparation method thereof
Technical Field
The application relates to the technical field of double-wall corrugated pipes, in particular to a polyethylene double-wall corrugated pipe and a preparation method thereof.
Background
The polyethylene double-wall corrugated pipe is a novel pipe with a corrugated outer wall and a smooth inner wall, which is formed by processing high-density polyethylene serving as a main raw material. At present, the composite material is widely used for rainwater and sewage discharge in municipal engineering, sewage discharge in living communities, industrial and mining enterprises, cable sheaths, electric wire sheaths and the like.
In the production, transportation and use processes of the polyethylene double-wall corrugated pipe, the phenomena of friction, scraping and the like caused by the inevitable mutual friction or the friction of hard objects are generated, and the appearance of the polyethylene double-wall corrugated pipe is greatly influenced. Therefore, how to improve the scratch resistance of the polyethylene double-wall corrugated pipe is a very important and urgent problem to be solved.
Disclosure of Invention
In order to enhance the scratch resistance of the polyethylene double-wall corrugated pipe, the application provides the polyethylene double-wall corrugated pipe and a preparation method thereof.
In a first aspect, the present application provides a polyethylene double-wall corrugated pipe, which adopts the following technical scheme:
a polyethylene double-wall corrugated pipe is prepared from the following raw materials in parts by weight: 100 portions of HDPE, 125 portions, 45 to 65 portions of LDPE, 0.3 to 0.5 portion of coupling agent, 1.5 to 2 portions of defoaming agent, 3 to 6 portions of anti-cracking fiber and 0.5 to 0.9 portion of lubricant; the lubricant comprises a liquid paraffin and an ethylene bis stearamide/polyurethane formulation.
By adopting the technical scheme, the HDPE and the LDPE are used as basic raw materials of the double-wall corrugated pipe, so that the double-wall corrugated pipe has the hardness, tensile strength, creep resistance and chemical stability of the HDPE and the softness, ductility and easy processing performance of the LDPE, and the performance of the double-wall corrugated pipe is better; the molecular structure of the coupling agent not only has organic functional groups, but also contains inorganic functional groups, so that the coupling agent is between an organic interface and an inorganic interface, the compatibility between the inorganic interface and the organic interface in the formula material is better, and the performance of the prepared double-wall corrugated pipe is better; the defoaming agent can reduce bubbles generated in the preparation process of the double-wall corrugated pipe, so that the structure of the double-wall corrugated pipe is more compact, and the comprehensive performance of the double-wall corrugated pipe is improved; the anti-cracking fiber has good anti-cracking performance, is in a fibrous structure and is dispersed in the raw materials, so that the effect of enhancing the connection strength among the components is achieved, and the anti-cracking performance of the double-wall corrugated pipe is improved; the liquid paraffin is an internal lubricant which can be uniformly distributed in the molecular structure, so that the fluidity of each component is improved, the raw materials are mixed more uniformly, and the quality of the prepared double-wall corrugated pipe is more uniform; the ethylene bis stearamide/polyurethane compound has the lubricating effect of an external lubricant of the ethylene bis stearamide, is easy to migrate to the surface of the double-wall corrugated pipe, and reduces the friction coefficient of the surface of the double-wall corrugated pipe, so that the friction force of the double-wall corrugated pipe when the double-wall corrugated pipe is in contact with the outside is reduced, the defect that the double-wall corrugated pipe is easy to wear is overcome, and the ethylene bis stearamide/polyurethane compound also has excellent damping performance of polyurethane, so that the anti-seismic performance of the double-wall corrugated pipe is improved.
Preferably, the ethylene bis-stearamide/polyurethane compound is formed by compounding the ethylene bis-stearamide and the polyurethane in a weight part ratio of 1 (3-5).
By adopting the technical scheme, the ratio of the ethylene bis-stearamide to the polyurethane is controlled within a reasonable range, and the ethylene bis-stearamide/polyurethane compound with optimal performance can be prepared, so that the double-wall corrugated pipe has better performance.
Preferably, the preparation method of the ethylene bis stearamide/polyurethane compound comprises the following steps: 1) uniformly stirring and mixing ethylene bis stearamide in parts by weight, polyurethane in parts by weight and a compatilizer accounting for 1-3% of the ethylene bis stearamide in parts by weight, and heating to a molten state to obtain a first mixture; 2) mixing the first mixture for 2-3 hours by using ultrasonic equipment on the premise of maintaining the molten state of the first mixture to obtain a second mixture; 3) and extruding, cooling and ball-milling the mixture II to obtain the ethylene bis-stearamide/polyurethane compound.
By adopting the technical scheme, the compatilizer can improve the interface compatibility between the ethylene bis-stearamide and the polyurethane, so that the ethylene bis-stearamide and the polyurethane are mixed more uniformly, the quality of the ethylene bis-stearamide/polyurethane compound is more uniform, the ethylene bis-stearamide and the polyurethane can be fully contacted and mixed by utilizing ultrasonic equipment, the mixing uniformity between the ethylene bis-stearamide and the polyurethane is further improved, and the performance of the ethylene bis-stearamide/polyurethane compound is better.
Preferably, the ethylene bis stearamide/polyurethane compound comprises two types of large particles and small particles in a weight portion ratio of 1 (2-3), wherein the particle size of the large particles is 300-400 meshes, and the particle size of the small particles is 100-200 meshes.
By adopting the technical scheme, the ethylene bis-stearamide/polyurethane compound is set into two granularity sizes, and when the double-wall corrugated pipe is prepared, the ethylene bis-stearamide/polyurethane compound with large granularity has larger weight and is easier to migrate to the corrugation on the surface of the double-wall corrugated pipe, so that the wear resistance of the corrugation of the double-wall corrugated pipe is better, and the performance of the double-wall corrugated pipe is better.
Preferably, the weight part ratio of the internal lubricant to the external lubricant is 1 (7-9).
By adopting the technical scheme, the proportion of the inner lubricant and the outer lubricant is set within a reasonable range, so that on one hand, the lubricating property among the molecules of each component can be maintained within a proper range, and the outer lubricant can be uniformly distributed on the surface of the double-wall corrugated pipe, thereby preparing the double-wall corrugated pipe with better performance.
Preferably, the anti-crack fiber is one or more of glass fiber, ramie fiber and nano carbon fiber.
By adopting the technical scheme, the glass fiber has good heat resistance and corrosion resistance and high mechanical strength; the nano carbon fiber is lighter than aluminum and higher in strength than steel, has excellent fracture resistance, very stable chemical property and high corrosion resistance; the ramie fiber has an internal special ultrafine microporous structure, is very tough, has high strength and low extensibility, and has good wear resistance and good adhesiveness; therefore, the three fibers are selected as anti-cracking fibers, so that the anti-cracking performance of the double-wall corrugated pipe can be remarkably improved.
Preferably, the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber, wherein the weight ratio of the anti-crack fiber to the nano carbon fiber is (3.5-4.5) - (5-7): 1.
By adopting the technical scheme, the anti-crack fibers are mixed by the glass fibers, the ramie fibers and the nano carbon fibers, so that the glass fibers and the nano carbon fibers can be uniformly dispersed in the inner gaps of the ramie fibers to form a stable net-shaped structure, the anti-crack performance of the anti-crack fibers is improved, and the anti-crack performance of the double-wall corrugated pipe is improved.
In a second aspect, the present application provides a method for preparing a polyethylene double-wall corrugated pipe, which adopts the following technical scheme: the method comprises the following steps:
1) and weighing raw materials: weighing HDPE, LDPE, coupling agent, defoaming agent, anti-cracking fiber and lubricant according to parts by weight;
2) and preparing a blank: uniformly mixing the weighed raw materials, putting the mixture into a plastic extruding machine, and extruding and molding to obtain a corrugated pipe blank;
3) and preparing a crude product: the corrugated pipe blank is processed by a corrugated pipe forming machine, and then is processed by forming and flaring in sequence to obtain a rough corrugated pipe;
4) and preparing a finished product: and cooling the rough corrugated pipe to room temperature, and then cutting to obtain the finished polyethylene double-wall corrugated pipe.
By adopting the technical scheme, the polyethylene double-wall corrugated pipe prepared by the method has excellent performances, is simple in preparation process and is suitable for large-batch production.
Preferably, the fiber length of the anti-crack fiber is 1-3 mm.
By adopting the technical scheme, the fiber length of the anti-crack fibers is set to be 1-3mm, the fiber length is proper, the anti-crack fibers are conveniently and uniformly dispersed in the raw materials, and the prepared polyethylene double-wall corrugated pipe has better performance.
In summary, the present application has the following beneficial effects:
1. because the ethylene bis stearamide/polyurethane compound has the lubricating effect of the external lubricant of the ethylene bis stearamide, the ethylene bis stearamide/polyurethane compound is easy to migrate to the surface of the double-wall corrugated pipe, and the friction coefficient of the surface of the double-wall corrugated pipe is reduced, the friction force of the double-wall corrugated pipe when the double-wall corrugated pipe is in contact with the outside is reduced, the defect that the double-wall corrugated pipe is easy to wear is overcome, the ethylene bis stearamide/polyurethane compound also has excellent damping performance of polyurethane, and the anti-seismic performance of the double-wall corrugated pipe is improved.
2. In the application, the anti-crack fibers are mixed with the glass fibers, the ramie fibers and the nano carbon fibers, so that the glass fibers and the nano carbon fibers can be uniformly dispersed in the inner gaps of the ramie fibers to form a stable net-shaped structure, the anti-crack performance of the anti-crack fibers is improved, and the anti-crack performance of the double-wall corrugated pipe is improved.
3. The polyethylene double-wall corrugated pipe prepared by the method has excellent performances, is simple in preparation process, and is suitable for large-batch production.
Detailed Description
The present application will be described in further detail with reference to examples.
Some of the raw material sources in this application are:
HDPE is available from Shangguan, Shanghai Koma plastics materials Co., Ltd, with a product number of 2714;
LDPE is available from high standing plastics Co., Ltd, available in Dongguan, with a product number of 265 YZ;
the antifoaming agent is purchased from Shanghai Michelin Biochemical technology, Inc., with the product number of 0874979;
the silane coupling agent is purchased from Hangzhou Jessica chemical Co., Ltd, and has the product number of KH 550;
liquid silicone oil was purchased from Shanghai Merlin Biotechnology, Inc. under the trade designation P815701.
Preparation example of ethylene bis stearamide/polyurethane formulation
Preparation example 1
The preparation method of the ethylene bis-stearamide/polyurethane compound comprises the following steps:
1) 1kg of ethylene bis stearamide, 4kg of polyurethane and 0.015kg of compatilizer are stirred and mixed uniformly, and then are heated to a molten state to obtain a first mixture;
2) mixing the first mixture for 2.5 hours by using ultrasonic equipment on the premise of maintaining the molten state of the first mixture to obtain a second mixture;
3) extruding, cooling and ball-milling the mixture II to obtain an ethylene bis-stearamide/polyurethane compound;
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles with the mass ratio of 1: 2.5.
Preparation example 2
The preparation method of the ethylene bis-stearamide/polyurethane compound comprises the following steps:
1) 1kg of ethylene bis stearamide, 3kg of polyurethane and 0.01kg of compatilizer are stirred and mixed uniformly, and then are heated to a molten state to obtain a first mixture;
2) mixing the first mixture for 2 hours by using ultrasonic equipment on the premise of maintaining the molten state of the first mixture to obtain a second mixture;
3) extruding, cooling and ball-milling the mixture II to obtain an ethylene bis-stearamide/polyurethane compound;
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles with the mass ratio of 1: 2.5.
Preparation example 3
The preparation method of the ethylene bis-stearamide/polyurethane compound comprises the following steps:
1) 1kg of ethylene bis stearamide, 5kg of polyurethane and 0.02kg of compatilizer are stirred and mixed uniformly, and then are heated to a molten state to obtain a first mixture;
2) mixing the first mixture for 3 hours by using ultrasonic equipment on the premise of maintaining the molten state of the first mixture to obtain a second mixture;
3) extruding, cooling and ball-milling the mixture II to obtain an ethylene bis-stearamide/polyurethane compound;
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles with the mass ratio of 1: 2.5.
Preparation example 4
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that:
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles in a mass ratio of 1:2.
Preparation example 5
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that:
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles with the mass ratio of 1: 3.
Preparation example 6
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that:
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles with the mass ratio of 1: 1.
Preparation example 7
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that:
the prepared ethylene bis stearamide/polyurethane compound is 350-mesh particles and 150-mesh particles with the mass ratio of 1: 4.
Preparation example 8
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that:
the prepared ethylene bis stearamide/polyurethane compound is 300-mesh particles and 100-mesh particles with the mass ratio of 1: 4.
Preparation example 9
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that:
the prepared ethylene bis stearamide/polyurethane compound is 400-mesh particles and 200-mesh particles with the mass ratio of 1: 4.
Preparation example 10
The preparation method of the ethylene bis stearamide/polyurethane compound provided by the preparation example is different from the preparation example in that: the method comprises the following steps:
1) 1kg of ethylene bis stearamide, 4kg of polyurethane and 0.015kg of compatilizer are stirred and mixed uniformly, and then are heated to a molten state to obtain a first mixture;
3) and extruding, cooling and ball-milling the mixture to obtain the ethylene bis-stearamide/polyurethane compound.
Examples
Example 1
The polyethylene double-wall corrugated pipe provided by the embodiment is prepared from the following raw materials in mass:
112.5kg of HDPE, 55kg of LDPE, 0.4kg of coupling agent, 1.75kg of defoaming agent, 4.5kg of anti-cracking fiber and 0.7kg of lubricant;
wherein: the anti-crack fibers are a mixture of glass fibers, ramie fibers and nano carbon fibers in a mass ratio of 4:6:1, and the fiber length of the anti-crack fibers is 1 mm; the lubricant is a mixture of liquid silicone oil and an ethylene bis-stearamide/polyurethane compound in a mass ratio of 1:8, wherein the ethylene bis-stearamide/polyurethane compound in the preparation example 1 is selected.
The preparation method of the polyethylene double-wall corrugated pipe comprises the following steps:
1) and weighing raw materials: weighing 112.5kg of HDPE, 55kg of LDPE, 0.4kg of coupling agent, 1.75kg of defoaming agent, 4.5kg of anti-crack fiber and 0.7kg of lubricant for later use;
2) and preparing a blank: uniformly mixing the weighed raw materials, putting the mixture into a plastic extruding machine, and extruding and molding to obtain a corrugated pipe blank;
3) and preparing a crude product: the corrugated pipe blank is processed by a corrugated pipe forming machine, and then is processed by forming and flaring in sequence to obtain a rough corrugated pipe;
4) and preparing a finished product: and cooling the rough corrugated pipe to room temperature, and then cutting to obtain the finished polyethylene double-wall corrugated pipe.
Example 2
The polyethylene double-wall corrugated pipe provided by the embodiment is different from the polyethylene double-wall corrugated pipe provided by the embodiment 1 in that the polyethylene double-wall corrugated pipe is made of the following raw materials in mass: 100kg of HDPE, 45kg of LDPE, 0.3kg of coupling agent, 1.5kg of defoamer, 3kg of anti-crack fiber and 0.5kg of lubricant.
The preparation method of the polyethylene double-wall corrugated pipe in the embodiment is different from that of the embodiment 1 in that:
1) and weighing raw materials: 100kg of HDPE, 45kg of LDPE, 0.3kg of coupling agent, 1.5kg of defoaming agent, 3kg of anti-crack fiber and 0.5kg of lubricant are weighed for later use.
Example 3
The polyethylene double-wall corrugated pipe provided by the embodiment is different from the polyethylene double-wall corrugated pipe provided by the embodiment 1 in that the polyethylene double-wall corrugated pipe is made of the following raw materials in mass: 125kg of HDPE, 65kg of LDPE, 0.5kg of coupling agent, 2kg of defoaming agent, 6kg of anti-crack fiber and 0.9kg of lubricant.
The preparation method of the polyethylene double-wall corrugated pipe in the embodiment is different from that of the embodiment 1 in that:
1) and weighing raw materials: 125kg of HDPE, 65kg of LDPE, 0.5kg of coupling agent, 2kg of defoaming agent, 6kg of anti-crack fiber and 0.9kg of lubricant are weighed for later use.
Example 4
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber with the mass ratio of 3.5:5: 1.
Example 5
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber with the mass ratio of 4.5:7: 1.
Example 6
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber in a mass ratio of 3:4: 1.
Example 7
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber in a mass ratio of 5:8: 1.
Example 8
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is glass fiber.
Example 9
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is ramie fiber.
Example 10
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is nano carbon fiber.
Example 11
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of glass fiber and ramie fiber with the mass ratio of 4: 6.
Example 12
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of ramie fibers and nano carbon fibers with the mass ratio of 6: 1.
Example 13
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the anti-crack fiber is a mixture of glass fiber and carbon nanofiber with the mass ratio of 4: 1.
Example 14
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the fiber length of the crack resistant fiber is 1 mm.
Example 15
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the fiber length of the crack resistant fiber was 3 mm.
Example 16
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the fiber length of the crack resistant fiber is 4 mm.
Example 17
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the fiber length of the crack resistant fiber is 0.5 mm.
Example 18
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the lubricant is a mixture of liquid silicone oil and an ethylene bis stearamide/polyurethane compound in a mass ratio of 1: 7.
Example 19
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the lubricant is a mixture of liquid silicone oil and an ethylene bis stearamide/polyurethane compound in a mass ratio of 1: 9.
Example 20
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the lubricant is a mixture of liquid silicone oil and an ethylene bis stearamide/polyurethane compound in a mass ratio of 1: 6.
Example 21
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the lubricant is a mixture of liquid silicone oil and an ethylene bis stearamide/polyurethane compound in a mass ratio of 1: 10.
Example 22
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 2 was used.
Example 23
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 3 was used.
Example 24
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 4 was used.
Example 25
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 5 was used.
Example 26
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 6 was used.
Example 27
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane formulation of preparation example 7 was used.
Example 28
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 8 was used.
Example 29
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 9 was used.
Example 30
The present embodiment provides a polyethylene double-wall corrugated pipe, which is different from that of embodiment 1 in that: the ethylene bis stearamide/polyurethane compound of preparation example 10 was used.
Comparative example
Comparative example 1
The polyethylene double-wall corrugated pipe provided by the comparative example is different from that of the example 1 in that: the raw material does not contain anti-crack fibers.
Comparative example 2
The polyethylene double-wall corrugated pipe provided by the comparative example is different from that of the example 1 in that: the raw materials do not contain a lubricant.
Comparative example 3
The polyethylene double-wall corrugated pipe provided by the comparative example is different from that of the example 1 in that: the raw material does not contain anti-crack fibers and lubricants.
Comparative example 4
The polyethylene double-wall corrugated pipe provided by the comparative example is different from that of the example 1 in that: the lubricant in the raw materials is a mixture of liquid silicone oil and ethylene bis stearamide with the mass ratio of 1: 8.
Performance test
Determination of crack resistance
First, 10g of polyethylene double-wall corrugated pipe raw material is injected into a square plate with the thickness of 10mm by 10mm, and the square plate is placed for 24 hours to be used as a test sample.
The test sample is placed on a dynamic cracking resistance tester, the screw rod is rotated to enable the top knife to ascend, after a knife edge is in contact with the test sample, the ascending speed of the top knife needs to be slowed down, the test sample is observed by paying attention to, after cracks appear, a reading microscope needs to be used for observing and recording the width of the cracks at any time, the microscope needs to be placed horizontally, the fact that the focal length is appropriate and the observation field of view is clear is guaranteed, and auxiliary lighting equipment can be used to guarantee the accuracy of observation if necessary.
And (3) observing the crack condition of the sample under a microscope, and grading the crack condition, wherein the grading condition is as follows:
stage I: no obvious crack is generated under the mirror;
and II, stage: the width of the crack is 1 mm-3 mm;
grade III: the width of the crack is 4 mm-8 mm;
IV stage: the width of the crack is 8 mm-12 mm;
and V stage: the width of the crack is more than 12 mm;
the above crack grades characterize the crack resistance of the test specimens and the test results are recorded in table 1.
Secondly, detecting the wear resistance
The wear resistance of the sample is characterized by the wear amount, and the smaller the wear amount value is, the better the wear resistance is shown; the detection is carried out according to the GB/T25262-2010 standard, and the detection result is recorded in Table 1.
Third, rebound performance detection
The rebound performance was determined according to DIN 53512 @ 2000 rubber test rebound performance (Schob pendulum), with a higher rebound angle indicating better rebound performance, and the test results are reported in Table 1.
TABLE 1 Performance test Table
Test specimen Grade of cracking Abrasion loss per gram Rebound Angle/°
Example 1 1 1.51 80.54
Example 2 1 1.50 80.54
Example 3 1 1.51 80.53
Example 4 1 1.52 80.55
Example 5 1 1.52 80.55
Example 6 2 1.59 80.96
Example 7 2 1.58 80.96
Example 8 1 1.52 80.55
Example 9 1 1.51 80.54
Example 10 1 1.51 80.55
Example 11 1 1.52 80.54
Example 12 1 1.52 80.53
Example 13 1 1.51 80.54
Example 14 1 1.51 80.55
Example 15 1 1.51 80.53
Example 16 2 1.60 80.97
Example 17 2 1.61 80.96
Example 18 1 1.51 80.53
Example 19 1 1.52 80.54
Example 20 2 1.63 74.05
Example 21 2 1.64 74.07
Example 22 1 1.51 80.54
Example 23 1 1.51 80.55
Example 24 1 1.52 80.54
Example 25 1 1.51 80.54
Example 26 2 1.63 80.99
Example 27 2 1.64 80.98
Example 28 1 1.52 80.54
Example 29 1 1.51 80.56
Example 30 2 1.68 74.85
Preparation example 1 4 1.78 72.64
Preparation example 2 3 2.27 71.40
Preparation example 3 5 2.18 70.48
Preparation example 4 3 1.97 67.80
From the above performance test results, it can be seen that:
1. the results of the performance tests of examples 1-3 show that: all the performances of the three groups of samples are better, which shows that the polyethylene double-wall corrugated pipe prepared by the raw material composition and the preparation method has better performances.
2. According to the performance test results of the embodiment 1 and the embodiments 4 to 7, the following results can be obtained: the properties of examples 1, 4 and 5 are superior to those of examples 6 and 7, which shows that: when the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber, the weight ratio of the anti-crack fiber to the nano carbon fiber is (3.5-4.5): (5-7): 1, the mixing effect of the glass fiber, the ramie fiber and the nano carbon fiber is better, and the glass fiber and the nano carbon fiber can be uniformly dispersed in the internal gaps of the ramie fiber to form a stable net-shaped structure, so that the polyethylene double-wall corrugated pipe with excellent performance is prepared.
3. According to the performance test results of the embodiment 1 and the embodiments 9-13, the following results can be obtained: the properties of example 1 are slightly better than those of examples 9-13, indicating that: the anti-crack fiber is one or more of glass fiber, ramie fiber and nano carbon fiber, and the polyethylene double-wall corrugated pipe with better performance can be obtained, but when the three are mixed according to a specific proportion, the combined effect is optimal.
4. According to the performance test results of the embodiment 1 and the embodiments 14 to 17, the following results can be obtained: the properties of examples 1, 13 and 14 are superior to those of examples 14-17, which shows that: the fiber length of the anti-crack fiber is set to be 1-3mm, the fiber length is proper, the anti-crack fiber is conveniently and uniformly dispersed in the raw material, and the performance of the prepared polyethylene double-wall corrugated pipe is better.
5. According to the performance test results of the embodiment 1 and the embodiments 18 to 21, the following results can be obtained: the properties of examples 1, 18 and 19 are superior to those of examples 20 and 21, which shows that: the proportion of the inner lubricant and the outer lubricant is set within a reasonable range, so that on one hand, the lubricating performance among the molecules of each component can be maintained within a proper range, and the outer lubricant can be uniformly distributed on the surface of the double-wall corrugated pipe, thereby preparing the double-wall corrugated pipe with better performance.
6. According to the performance test results of the embodiment 1 and the embodiments 22 to 23, the following results can be obtained: all the performances of the three groups of samples are better, which shows that the ethylene bis-stearamide/polyurethane compound prepared by the preparation examples 1-3 has good performance, and further the performance of the polyethylene double-wall corrugated pipe is better.
7. According to the performance test results of the embodiment 1 and the embodiments 24 to 27, the following results can be obtained: the properties of examples 1, 24 and 25 are all superior to those of examples 26-27, indicating that: the ratio of the ethylene bis-stearamide to the polyurethane is controlled within 1 (3-5), so that the ethylene bis-stearamide/polyurethane compound with the optimal performance can be prepared, and the performance of the double-wall corrugated pipe is better.
8. According to the performance test results of the embodiment 1 and the embodiments 28 to 29, the following results can be obtained: the mass ratio of large particles to small particles in the ethylene bis-stearamide/polyurethane compound is 1 (2-3), when the particle size of the large particles is 300-400 meshes and the particle size of the small particles is 100-200 meshes, the prepared ethylene bis-stearamide/polyurethane compound has the optimal performance, so that the performance of the double-wall corrugated pipe is better.
9. According to the performance test results of the embodiment 1 and the embodiment 30, it can be seen that: the properties of example 1 are superior to those of example 30, indicating that: the ethylene bis-stearamide and the polyurethane can be fully contacted and mixed by utilizing ultrasonic equipment, and the mixing uniformity between the ethylene bis-stearamide and the polyurethane is improved, so that the performance of the ethylene bis-stearamide/polyurethane compound is better, and the performance of the double-wall corrugated pipe is improved.
8. According to the performance test results of the example 1 and the comparative examples 1 and 3, it can be seen that: the crack resistance of example 1 is significantly better than that of comparative examples 1 and 3, which shows that: the anti-cracking fiber has good anti-cracking performance, is in a fibrous structure and is dispersed in the raw materials, so that the effect of enhancing the connection strength among the components is achieved, and the anti-cracking performance of the double-wall corrugated pipe is improved.
9. According to the performance test results of the example 1 and the comparative examples 1 and 2, it can be seen that: the wear resistance of example 1 is clearly superior to that of comparative examples 1 and 2, which shows that: on one hand, the ethylene bis-stearamide/polyurethane compound has the lubricating effect of an external lubricant of the ethylene bis-stearamide, is easy to migrate to the surface of the double-wall corrugated pipe, and reduces the friction coefficient of the surface of the double-wall corrugated pipe, so that the friction force of the double-wall corrugated pipe is reduced when the double-wall corrugated pipe is in contact with the outside, and the defect that the double-wall corrugated pipe is easy to wear is overcome.
10. According to the performance test results of the example 1 and the comparative example 4, the following results can be obtained: the resilience performance of example 1 is significantly better than that of comparative example 4, indicating that: the ethylene bis-stearamide/polyurethane compound has excellent damping property of polyurethane, so that the anti-seismic property of the double-wall corrugated pipe is improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (9)

1. A polyethylene double-wall corrugated pipe is characterized in that: the feed is prepared from the following raw materials in parts by weight: 100 portions of HDPE, 125 portions, 45 to 65 portions of LDPE, 0.3 to 0.5 portion of coupling agent, 1.5 to 2 portions of defoaming agent, 3 to 6 portions of anti-cracking fiber and 0.5 to 0.9 portion of lubricant; the lubricant comprises a liquid paraffin and an ethylene bis stearamide/polyurethane formulation.
2. The polyethylene double wall corrugated pipe of claim 1, wherein: the ethylene bis-stearamide/polyurethane compound is formed by compounding ethylene bis-stearamide and polyurethane according to the weight part ratio of 1 (3-5).
3. The polyethylene double wall corrugated pipe of claim 2, wherein: the preparation method of the ethylene bis-stearamide/polyurethane compound comprises the following steps: 1) uniformly stirring and mixing ethylene bis stearamide in parts by weight, polyurethane in parts by weight and a compatilizer accounting for 1-3% of the ethylene bis stearamide in parts by weight, and heating to a molten state to obtain a first mixture; 2) mixing the first mixture for 2-3 hours by using ultrasonic equipment on the premise of maintaining the molten state of the first mixture to obtain a second mixture; 3) and extruding, cooling and ball-milling the mixture II to obtain the ethylene bis-stearamide/polyurethane compound.
4. The polyethylene double wall corrugated pipe of claim 3, wherein: the ethylene bis stearamide/polyurethane compound comprises two types of large particles and small particles in a weight portion ratio of 1 (2-3), wherein the particle size of the large particles is 300-400 meshes, and the particle size of the small particles is 100-200 meshes.
5. The polyethylene double wall corrugated pipe of claim 1, wherein: the weight portion ratio of the internal lubricant to the external lubricant is 1 (7-9).
6. The polyethylene double wall corrugated pipe of claim 1, wherein: the anti-crack fiber is one or more of glass fiber, ramie fiber and nano carbon fiber.
7. The polyethylene double wall corrugated pipe of claim 6, wherein: the anti-crack fiber is a mixture of glass fiber, ramie fiber and nano carbon fiber, wherein the weight ratio of the anti-crack fiber is (3.5-4.5) to (5-7) to 1.
8. A method for preparing polyethylene double-wall corrugated pipe according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
1) and weighing raw materials: weighing HDPE, LDPE, coupling agent, defoaming agent, anti-cracking fiber and lubricant according to parts by weight;
2) and preparing a blank: uniformly mixing the weighed raw materials, putting the mixture into a plastic extruding machine, and extruding and molding to obtain a corrugated pipe blank;
3) and preparing a crude product: the corrugated pipe blank is processed by a corrugated pipe forming machine, and then is processed by forming and flaring in sequence to obtain a rough corrugated pipe;
4) and preparing a finished product: and cooling the rough corrugated pipe to room temperature, and then cutting to obtain the finished polyethylene double-wall corrugated pipe.
9. The method for preparing a polyethylene double-wall corrugated pipe according to claim 8, wherein: the fiber length of the anti-crack fiber is 1-3 mm.
CN202011553929.9A 2020-12-24 2020-12-24 Polyethylene double-wall corrugated pipe and preparation method thereof Pending CN112592527A (en)

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