CN113444305A - UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and preparation method thereof - Google Patents

UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and preparation method thereof Download PDF

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CN113444305A
CN113444305A CN202010229487.6A CN202010229487A CN113444305A CN 113444305 A CN113444305 A CN 113444305A CN 202010229487 A CN202010229487 A CN 202010229487A CN 113444305 A CN113444305 A CN 113444305A
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uhmwpe
temperature
hdpe
polyethylene wax
drying
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张进
陈建福
刘宁
刘晓晨
何晶晶
曾亮丹
林延带
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Fujian Nachuan Pipe Industry Technology 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
    • 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
    • C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods
    • 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
    • C08L2207/068—Ultra high molecular weight polyethylene

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  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

The invention discloses an UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and a preparation method thereof. The UHMWPE is modified by a melt blending method by taking UHMWPE as a matrix, polyethylene glycol (PEG) as a toughening agent, high-density polyethylene (HDPE) as a plasticizer and polyethylene wax as a lubricant, so that the brittleness of the material is reduced, and the processability is improved. The prepared UHMWPE based composite material is suitable for producing pipes such as double-wall corrugated pipes, winding pipes and the like, overcomes the defects of insufficient toughness and poor processability of the existing pipes in practical application, and is simple to operate and easy for industrial production.

Description

UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and preparation method thereof
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to an UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and a preparation method thereof.
Background
Ultra-high molecular weight Polyethylene (UItra-high molecular weight Polyethylene, abbreviated as UHMWPE) generally refers to Polyethylene (PE) having a relative molecular mass of over 150 ten thousand. The relative molecular mass of common PE is only 2-30 ten thousand, the relative molecular mass of domestic UHMWPE can reach 400-500 ten thousand, while that of UHMWPE produced by Ticona can reach 1000 ten thousand, the extrusion, injection molding and processing are difficult, and only a mould pressing, sintering and molding method can be adopted. However, since compression molding is often inefficient and energy-consuming, it is urgent to find an efficient molding method for UHMWPE, which is difficult to mold.
On the other hand, UHMWPE is an existing high-quality engineering plastic, and the supported pipe has obvious advantages in many aspects compared with other plastic pipes and metal pipes. For example, UHMWPE has high wear resistance and favorable impact toughness, and the lubricating property is also in the top of plastics, which is 5-7 times that of common plastics and 7-10 times that of steel pipes. However, UHMWPE, due to its ultra-high relative molecular mass, has a very high melt viscosity (up to 1 × 10)8Pa · s), extremely poor flowability, extremely low critical shear rate, and processing makes it extremely prone to melt fracture, which is the focus of attention. It is very difficult to extrude UHMWPE pipes using conventional extrusion equipment, and the currently developed extrusion equipment is not satisfactory at all, and therefore it is necessary to modify its rheological behavior to achieve its processability while maintaining its excellent macroscopic properties.
At present, the means for modifying the rheological behavior of the ultrahigh molecular weight polyethylene is mainly to improve the fluidity of the UHMWPE by adding a medium-low molecular weight polyethylene material or a fluidity modifier (liquid crystal, liquid paraffin and the like), or to improve molding equipment, or to adopt a new molding processing technology. However, the addition of the medium and low molecular weight polyethylene can improve the fluidity of UHMWPE, but has the defects of surface fracture of extruded melt, unsmooth sharkskin and the like, so that the problems which need to be solved by researchers are also solved.
Chinese patent CN1428370 mixes 85-96% of ultra-high molecular weight polyethylene, 3-15 polysiloxane and 0.2-2% of antioxidant, uniformly stirs, dries, and extrudes and granulates the dried raw material, because the organic silicon is added into the mixture as modifier, the fluidity is greatly improved, and the prepared UHMWPE pipe has excellent wear resistance, corrosion resistance and low temperature resistance, but the problem of surface defect in the extrusion molding process is not mentioned in the patent. Chinese patent CN106750724A disclosesThe composition for preparing the ultra-high molecular weight polyethylene pipe has excellent thermo-oxidative aging resistance, and also has excellent mechanical property, wear resistance, corrosion resistance and extrusion processability. But the components of the formula design are complex, the original mechanical property of UHMWPE is also influenced to a certain extent, and the problem of surface defects in the process of extrusion molding of the ultrahigh molecular pipe is not mentioned in the patent. The invention mainly aims at the purposes of enhancing the plasticity of the traditional UHMWPE pipe so as to be easy to process, eliminating surface defects and reducing production energy consumption, and develops an UHMWPE-based composite extruded pipe and a preparation method thereof. The selected UHMWPE raw material has the number average molecular weight of 3.3 multiplied by 106−4.1×106g/mol, the main application field is entertainment facilities, and the wear resistance is good; the selected HDPE has moderate liquidity and high viscosity, can be subjected to high-temperature injection molding, can also improve the mechanical property, and is suitable for production of containers and non-pressure-resistant pipes for containing chemicals with higher activity. The polyethylene wax can obviously improve the lubricity of the material, so that the material is easy to process and form, and the PEG serving as a toughening agent can also obviously improve the toughness of the material, so that the application range of the polyethylene wax is wider. Therefore, the invention mainly develops the UHMWPE based composite extruded pipe and the preparation method thereof aiming at the production of the application of the pipe such as double-wall corrugated pipe, winding pipe and the like, and initially explores the process of the method.
Disclosure of Invention
The invention aims to provide an UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and a preparation method thereof. The prepared UHMWPE-based composite extrusion pipe has stronger toughness and plasticity on the basis of ensuring the mechanical strength. Not only the elongation at break is enhanced, the rigidity of the raw materials is reduced, but also the production cost is effectively reduced. More significant, products such as double-wall corrugated pipes, winding pipes and the like made of UHMWPE base pipes have excellent performance, simple operation and easy industrial production, and can effectively solve the problems of poor toughness, cracking, difficult processing and the like of products produced by other methods.
In order to achieve the purpose, the invention adopts the following technical scheme:
a UHMWPE based composite extruded pipe and a preparation method thereof comprise the following steps:
(1) drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG:
(2) pulverizing multi-branched PEG with pulverizer;
(3) mixing UHMWPE and HDPE uniformly in a Brabender Plastograph internal mixer according to a certain proportion, then mixing the crushed polybranched PEG, polyethylene wax and the blend, and granulating;
(4) and (3) drying the master batch in vacuum, and then extruding and molding to obtain pipe samples such as double-wall corrugated pipes, winding pipes and the like.
Preferably, the drying temperature in the step (1) is 60-80 ℃ and the time is 5-10 h.
Preferably, the crushing fineness in the step (2) is 30-80 meshes, the feeding particle size is less than 16 mm, the temperature is 60-180 ℃, and the main shaft rotating speed is 2000-4000 rpm.
Preferably, the HDPE in the step (3) accounts for 20-40%, the blending temperature is 160-220 ℃, the multi-branched PEG accounts for 10-30% of the mixture, the polyethylene wax accounts for 5-15% of the mixture, and the rotating speed is 30-80 rpm.
Preferably, the master batch particles in step (4) are dried under vacuum for 1-8 h at a temperature of 50-90 ℃. In the process of extruding and molding the pipe sample, the temperatures of the head part, the middle part and the tail part of the double-screw extruder are respectively 160-250 ℃, 160-230 ℃ and 80-150 ℃, and the mold temperature is 160-240 ℃.
Compared with the prior art, the invention has the beneficial effects that: the ultra-high molecular weight polyethylene (UHMWPE) is modified by a melt blending method by taking the UHMWPE as a matrix, polyethylene glycol (PEG) as a toughening agent, High Density Polyethylene (HDPE) as a plasticizer and polyethylene wax as a lubricant, so that the brittleness of the material is reduced, and the processability is improved. The prepared UHMWPE based composite material is suitable for being applied to the production of pipes such as double-wall corrugated pipes, winding pipes and the like, overcomes the defects of poor toughness and processability of the master batch produced by the existing pipes, and is simple to operate and easy for industrial production.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The invention discloses an UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG:
(2) pulverizing multi-branched PEG with pulverizer;
(3) mixing UHMWPE and HDPE uniformly in a Brabender Plastograph internal mixer according to a certain proportion, then mixing the crushed polybranched PEG, polyethylene wax and the blend, and granulating;
(4) and (3) drying the master batch in vacuum, and then extruding and molding to obtain pipe samples such as double-wall corrugated pipes, winding pipes and the like.
In the present invention, UHMWPE, HDPE, polyethylene wax, and multi-branched PEG are first air-dried in an electric oven. The temperature of the material in an electric thermostat is 60-80 ℃ and the time is 5-10 h. Pulverizing the multi-branched PEG with a pulverizer, wherein the pulverizing fineness is 30-80 meshes, the feeding granularity is less than 16 mm, the temperature is 60-180 ℃, and the main shaft rotation speed is 2000-4000 rpm. The UHMWPE, HDPE were then mixed in a Brabender Plastograph internal mixer. The proportion of HDPE is 20% -40%, and the blending temperature is 160 ℃ and 220 ℃. Then mixing the mixture with the crushed multi-branched PEG and polyethylene wax, wherein the multi-branched PEG accounts for 10-30% of the mixture, the polyethylene wax accounts for 5-15% of the mixture, and the rotating speed is set to be 30-80 rpm. And granulating by a granulator after uniformly mixing. Because the moisture absorbed by the prepared master batch particles after being placed for a period of time in actual production influences the subsequent process preparation, the master batch particles are dried in a vacuum oven. The standing time is 0.5-5 h, the vacuum drying time is 1-10 h, and the drying temperature is 50-100 ℃. More preferably, the standing time is 0.5-3 h, the drying temperature is 50-90 ℃, and the drying time is 1-8 h. Subsequently, the obtained master batch particles are subjected to blending extrusion molding in a single-screw extruder. The screw speed is 60-80 rpm, and the rotation speed is gradually increased to the maximum rotation speed from 10 rpm during feeding. The head temperature, the middle temperature and the tail temperature of the double-screw extruder are respectively 150 ℃ and 250 ℃, 140 ℃ and 230 ℃ and 50-150 ℃, and the mold temperature is 150 ℃ and 250 ℃. More preferably, the screw speed is 65-70 rpm.
The invention maximizes the mechanical property of the UHMWPE-based composite extruded pipe by optimizing the specific gravity of UHMWPE, HDPE, polyethylene wax and multi-branched PEG; the low cost and the practicability of the UHMWPE based composite material are ensured by regulating and controlling the HDPE plasticizer with a certain specific gravity; more significantly, based on the addition of the multi-branched PEG flexibilizer and the polyethylene wax lubricant with a certain proportion, the UHMWPE-based composite material with stronger toughness and difficult fracture is obtained, the defects of poor toughness, insufficient processability and the like of the existing UHMWPE-based pipe are effectively overcome, the operation is simple, and the production cost is reduced. In general, the preparation method is simple, and the obtained toughened and modified UHMWPE-based composite pipe has good comprehensive performance and is easy for industrial production.
Example 1
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 2
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 30%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 3
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 40%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 4
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 20% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 5
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounts for 30% of the mixture, polyethylene wax accounts for 5% of the mixture, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 6
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 10% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 7
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 180 ℃. Then, the pulverized multi-branched PEG and polyethylene wax were mixed with the blend, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 15% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 8
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 160 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 9
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 200 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein the mixture of the ground multi-branched PEG was 10% by weight, the mixture of the ground multi-branched PEG and the polyethylene wax was 5% by weight, and the rotation speed was set at 60 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 10
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 160 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 40 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
Example 11
(1) Drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG at 60 ℃ for 5 h;
(2) crushing multi-branched PEG with a crusher, wherein the crushing fineness is 50 meshes, the feed granularity is 10 mm, the temperature is 100 ℃, and the main shaft rotation speed is 3000 rpm;
(3) UHMWPE and HDPE were mixed in a Brabender Plastograph mixer. The proportion of HDPE is 20%, and the blending temperature is 160 ℃. Then, the pulverized multi-branched PEG, polyethylene wax and the blend were mixed, wherein PEG accounted for 10% of the mixture specific gravity, polyethylene wax accounted for 5% of the mixture specific gravity, and the rotation speed was set at 80 rpm. Granulating by a granulator after uniformly mixing;
(4) placing the mixed master batch particles for 2 hours, and drying at 50 ℃ in a vacuum drying box for 5 hours; and carrying out blending extrusion molding on the dried master batch particles in a single-screw extruder to obtain the UHMWPE-based composite pipe. The screw speed was 65 rpm, and the screw speed was gradually increased from 10 rpm to the maximum speed during the feeding. The head temperature, the middle temperature and the tail temperature of the twin-screw extruder are 230 ℃, 220 ℃ and 80 ℃, and the die temperature is 220 ℃.
By regulating and controlling HDPE plasticizer with certain specific gravity, such as comparative example 1, example 2 and example 3, it can be proved that the HDPE plasticizer can remarkably improve the elongation at break, tensile strength and melt index of the material, thereby enhancing the plasticity and toughness of the pipe and reducing the production cost; by regulating and controlling a certain specific gravity of the PEG toughening agent, such as the comparison of example 1, example 4 and example 5, the PEG serving as the toughening agent can also obviously improve the elongation at break, the tensile strength and the melt index of the material, so that the plasticity and the toughness of the pipe can be enhanced, and the production cost can be reduced. By comparing the examples 1, 6 and 7, the addition of the polyethylene wax lubricant enables the toughness of the material to be stronger, and effectively overcomes the defects of poor toughness, insufficient processability and the like of the existing UHMWPE base pipe, the operation is simple, and the production cost is reduced. In general, the preparation method is simple, and the obtained toughened and modified UHMWPE-based composite pipe has good comprehensive performance and is easy for industrial production. Specific comparisons are shown in table 1:
table 1 different ratios and properties of the examples and comparative examples.
Figure 973324DEST_PATH_IMAGE002
Compared with a pure UHMWPE-based extruded pipe, the UHMWPE, the HDPE, the polyethylene wax and the multi-branched PEG in the composite material can generate synergistic effect, the elongation at break of the pipe is improved within a specific proportion range, the melt index and the tensile strength are enhanced, the processing performance is improved, the cost is obviously reduced, and the industrial application is realized. Through systematic research on components, the optimal formula scheme can be selected according to the actual use environment of the pipe.
The above embodiments are merely provided to aid understanding of the method of the present invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. A UHMWPE based composite extrusion pipe and a preparation method thereof are characterized in that: the method comprises the following steps:
(1) drying UHMWPE, HDPE, polyethylene wax and multi-branched PEG:
(2) pulverizing multi-branched PEG with pulverizer;
(3) mixing UHMWPE and HDPE uniformly in a Brabender Plastograph internal mixer according to a certain proportion, then mixing the crushed polybranched PEG, polyethylene wax and the blend, and granulating;
(4) and (3) drying the master batch in vacuum, and then extruding and molding to obtain pipe samples such as double-wall corrugated pipes, winding pipes and the like.
2. The UHMWPE based coextruded tubing and method of making according to claim 1, wherein: in the step (1), the drying temperature is 60-85 ℃ and the drying time is 3-15 h.
3. The UHMWPE based coextruded tubing and method of making according to claim 1, wherein: the crushing fineness of the step (2) is 20-80 meshes, the feeding granularity is less than 16 mm, the temperature is 60-190 ℃, and the main shaft rotating speed is 2000-.
4. The UHMWPE based coextruded tubing and method of making according to claim 1, wherein: the HDPE accounts for 10-40 percent in the step (3), the blending temperature is 150-230 ℃, the multi-branched PEG accounts for 10-30 percent of the mixture, the polyethylene wax accounts for 5-15 percent of the mixture, and the rotating speed is 30-100 rpm.
5. The UHMWPE based coextruded tubing and method of making according to claim 1, wherein: the vacuum drying time of the master batch particles in the step (4) is 1-10 h, the drying temperature is 50-100 ℃ in the extrusion molding process of the pipe sample, the head temperature, the middle temperature and the tail temperature of the double-screw extruder are respectively 150-.
CN202010229487.6A 2020-03-27 2020-03-27 UHMWPE (ultrahigh molecular weight polyethylene) based composite extruded pipe and preparation method thereof Pending CN113444305A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116162312A (en) * 2022-12-26 2023-05-26 湖南工业职业技术学院 High polymer material wear-resistant concrete conveying pipeline

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116162312A (en) * 2022-12-26 2023-05-26 湖南工业职业技术学院 High polymer material wear-resistant concrete conveying pipeline
CN116162312B (en) * 2022-12-26 2024-05-03 湖南工业职业技术学院 High polymer material wear-resistant concrete conveying pipeline

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