CN115232381B - Ultra-high molecular weight polyethylene product and preparation method thereof - Google Patents
Ultra-high molecular weight polyethylene product and preparation method thereof Download PDFInfo
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- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 title claims abstract description 102
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title description 3
- -1 polyethylene Polymers 0.000 claims abstract description 45
- 239000004698 Polyethylene Substances 0.000 claims abstract description 41
- 238000001746 injection moulding Methods 0.000 claims abstract description 41
- 229920000573 polyethylene Polymers 0.000 claims abstract description 41
- 230000002902 bimodal effect Effects 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 10
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- 239000012752 auxiliary agent Substances 0.000 claims description 8
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 230000003078 antioxidant effect Effects 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 7
- 239000002216 antistatic agent Substances 0.000 claims description 4
- 239000003086 colorant Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 239000004599 antimicrobial Substances 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003063 flame retardant Substances 0.000 claims description 2
- 239000012760 heat stabilizer Substances 0.000 claims description 2
- 239000012748 slip agent Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 description 42
- 238000012545 processing Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 16
- 239000013078 crystal Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 4
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- 230000001276 controlling effect Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 101100453790 Drosophila melanogaster Kebab gene Proteins 0.000 description 2
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
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- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000000235 small-angle X-ray scattering Methods 0.000 description 2
- 238000004736 wide-angle X-ray diffraction Methods 0.000 description 2
- YHMYGUUIMTVXNW-UHFFFAOYSA-N 1,3-dihydrobenzimidazole-2-thione Chemical compound C1=CC=C2NC(S)=NC2=C1 YHMYGUUIMTVXNW-UHFFFAOYSA-N 0.000 description 1
- PRWJPWSKLXYEPD-UHFFFAOYSA-N 4-[4,4-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butan-2-yl]-2-tert-butyl-5-methylphenol Chemical compound C=1C(C(C)(C)C)=C(O)C=C(C)C=1C(C)CC(C=1C(=CC(O)=C(C=1)C(C)(C)C)C)C1=CC(C(C)(C)C)=C(O)C=C1C PRWJPWSKLXYEPD-UHFFFAOYSA-N 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- AYEKOFBPNLCAJY-UHFFFAOYSA-O thiamine pyrophosphate Chemical compound CC1=C(CCOP(O)(=O)OP(O)(O)=O)SC=[N+]1CC1=CN=C(C)N=C1N AYEKOFBPNLCAJY-UHFFFAOYSA-O 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a high-performance ultra-high molecular weight polyethylene product and a preparation method thereof. The ultra-high molecular weight polyethylene product is obtained by adding an ultra-high molecular weight polyethylene composition into an injection molding machine for injection molding, wherein the ultra-high molecular weight polyethylene composition comprises 60-95% of ultra-high molecular weight polyethylene and 5-40% of bimodal polyethylene according to mass content, and the weight average molecular weight of the ultra-high molecular weight polyethylene is 1500000-9000000; the bimodal polyethylene has a weight average molecular weight of 200000-1200000 and a molecular weight distribution of 20-60. The breaking strength of the finally prepared ultra-high molecular weight polyethylene injection molding product is more than 80MPa, the tensile modulus is more than 1900MPa, and the impact strength is more than 110MPa.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a high-performance ultra-high molecular weight polyethylene product and a preparation method thereof.
Background
The ultra-high molecular weight polyethylene is thermoplastic engineering plastics with molecular weight more than 100 ten thousand and linear structure, almost integrates the advantages of various plastics, and has comprehensive properties of wear resistance, impact resistance, self lubrication, corrosion resistance, low temperature resistance, sanitation, no toxicity, difficult adhesion, difficult water absorption, low density and the like which are incomparable with common polyethylene and other engineering plastics. At present, ultra-high molecular weight polyethylene has been widely applied to the fields of textile, papermaking, food, chemical industry, agriculture, mine, construction, medical treatment, sports, military and the like. However, the ultra-high molecular weight polyethylene melt presents a rubber-like high-viscosity elastomer, the melt viscosity is as high as 10 8 Pa.s, the melt flow index is almost zero, the critical shear rate of the ultra-high molecular weight polyethylene is very low, and the defects of melt fracture and the like are easily generated. The popularization and the application of the ultra-high molecular weight polyethylene are limited to a great extent. Therefore, development of the molding processing technology of the ultra-high molecular polyethylene is particularly important.
Chinese patent CN 1244626C reports that adding a certain portion of polypropylene and other additives into ultra-high molecular weight polyethylene, melt blending and granulating at high temperature, and preparing an ultra-high molecular weight polyethylene product which can be used for injection molding and extrusion molding processing. The method utilizes the fluidity of polypropylene to reduce the high viscosity of the ultra-high molecular weight polyethylene during processing, but the compatibility of polypropylene and the ultra-high molecular weight polyethylene is poor, so the mechanical property of the product is greatly reduced.
Chinese patent CN 113292775A reports that a certain portion of high-density polyethylene, low-density polyethylene, inorganic fiber, compatilizer, modifier and other auxiliary agents are added into ultra-high molecular weight polyethylene, and melt extrusion granulation is performed at high temperature, thus obtaining an injection-grade ultra-high molecular weight polyethylene. The method improves the fluidity of the ultra-high molecular weight polyethylene composition by adding the high-density polyethylene and the low-density polyethylene, but the addition of excessive auxiliary agents not only reduces the mechanical property, but also makes the processing technology very complex.
With the continuous expansion of the application of ultra-high molecular weight polyethylene, the market demand for ultra-high molecular weight polyethylene products of various special shaped products is continuously increasing, and the demand for ultra-high molecular weight polyethylene injection molding technology with excellent mechanical properties and lower cost is continuously increasing. Therefore, the art is urgent to find an injection molding technology for ultra-high molecular weight polyethylene, so as to meet the market demand.
The bimodal polyethylene is polyethylene resin with two peaks of molecular weight distribution curve, the high molecular weight part of the bimodal polyethylene can reach higher physical and mechanical strength, and the low molecular weight part can improve processing fluidity. If the proper ultra-high molecular weight polyethylene and the bimodal polyethylene are selected and blended in a proper proportion, the ultra-high molecular weight polyethylene and the bimodal polyethylene can be uniformly mixed on a molecular level to form a multimodal polyethylene composition. In the processing process of the high polymer material, the existence of flow fields such as a shearing field or a stretching field can have important influence on the molecular chain orientation and crystallization of the high polymer, for example, the flow fields can induce the formation of macromolecule shish-kebab crystals (cross crystals), thereby influencing the macroscopic mechanical properties of the material. In the processing of the composition of the ultra-high molecular weight polyethylene and the bimodal polyethylene, the flow field in the processing process is controlled by regulating and controlling the processing technology, and the ultra-high molecular weight polyethylene can induce the high molecular weight part of the bimodal polyethylene to form a shish crystal and other parts to form a kebab crystal. Compared with the common spherulites, the shish-kebab crystals can improve the strength and the thermal stability of the polymer material product, and have important significance for improving the performance of the polymer material product.
The information disclosed in the background section is only for aiding in the understanding of the background of the invention and is not to be construed as an admission or any of its forms as prior art to the known art.
Disclosure of Invention
The invention aims to provide a high-performance ultra-high molecular weight polyethylene product and a preparation method thereof.
Through innovative research of the inventor, the inventor finds that a polyethylene composition with multimodal distribution is formed by selecting bimodal polyethylene with specific molecular weight and distribution and ultrahigh molecular weight polyethylene, a high-performance ultrahigh molecular weight polyethylene product is prepared, and an injection molding method of the high-performance ultrahigh molecular weight polyethylene product is developed.
In order to achieve the above object, the present invention provides the following technical solutions:
An ultra-high molecular weight polyethylene product is obtained by adding an ultra-high molecular weight polyethylene composition into an injection molding machine for injection molding, wherein the ultra-high molecular weight polyethylene composition comprises 60-95% of ultra-high molecular weight polyethylene and 540% of bimodal polyethylene according to mass content, and the weight average molecular weight of the ultra-high molecular weight polyethylene is 1500000-9000000; the weight average molecular weight of the bimodal polyethylene is 200000-1200000, and the molecular weight distribution is 20-60;
The temperature of the feeding section of the injection molding machine is 150-210 ℃ and the temperature of the compression section of the injection molding machine is 230-260 ℃; the temperature of the homogenizing section is 230-260 ℃, the temperature of the material passing through the nozzle is 230-260 ℃, the rotating speed of the screw is 10-200rpm, the injection pressure is 10-300MPa, the holding pressure is 8-120MPa, the holding time is 60-200s, the temperature of the die is 30-60 ℃, and the cooling speed of the material in the die is 8-25 ℃/min.
The ultra-high molecular weight polyethylene preferably has a weight average molecular weight of 2500000-8000000, more preferably 4000000-7000000; the mass content of the ultra-high molecular weight polyethylene in the ultra-high molecular weight polyethylene composition is preferably 70-95%. The ultra-high molecular weight polyethylene product is preferable because it has high mechanical properties and high processing efficiency.
The bimodal polyethylene preferably has a weight average molecular weight of 400000-1000000 and a molecular weight distribution of 30-50. In the case of the above molecular weight and molecular weight distribution, bimodal polyethylene is preferred because it enables uniform mixing with ultra high molecular weight polyethylene on a molecular level while improving the composition flowability and giving a greater compromise to the mechanical properties of the product.
The bimodal polyethylene may be branched or unbranched, typically with a branching content of 0-1%. The invention is preferably a bimodal polyethylene without branched chains, and the presence of branched chains reduces the regularity of the polymer chains, so that the polymer chains are not easy to crystallize, and the mechanical properties of the final product are easy to be reduced.
The ultra-high molecular weight polyethylene composition may further contain an auxiliary agent, and the type of auxiliary agent is not particularly limited, and examples thereof include an antioxidant, a heat stabilizer, an antibacterial agent, a flame retardant, a colorant, an antistatic agent, a lubricant, a slip agent, and a radiation stabilizer. The auxiliary agent contained in the ultra-high molecular weight polyethylene composition is one or more of the above auxiliary agent types, and the addition amount is not particularly limited, and is usually 0.01 to 0.5w% of the ultra-high molecular weight polyethylene composition, within which the auxiliary agent can play a role and does not affect the structure and mechanical properties of the product.
The antioxidant is not particularly limited, and may be one or more of antioxidant 1010, antioxidant 1076, antioxidant CA, antioxidant 168, antioxidant 264, antioxidant NP, antioxidant DLTP, antioxidant TNP, antioxidant TPP, and antioxidant MB.
The injection molding machine in the present invention is not particularly limited, and examples thereof include a plunger type injection molding machine and a screw type injection molding machine, and screw type injection molding machines are preferable, since they have a better melting effect on the ultra-high molecular weight polyethylene composition.
The temperature of the material homogenizing section and the temperature of the material passing nozzle of the injection molding machine are preferably 240-250 ℃, and the material homogenizing section and the material passing nozzle of the injection molding machine can ensure the fluidity of the ultra-high molecular weight polyethylene composition and the degradation degree of the polyethylene in the temperature range, so that the material homogenizing section and the material passing nozzle are preferably selected.
The injection pressure in the invention is preferably 100-250MPa, the injection pressure is high, the orientation degree of molecular chains in the ultra-high molecular weight polyethylene composition under the action of a shearing and stretching flow field is high, and the mechanical property of the product is good. In the injection pressure range, the injection molding is better and no bubble exists. And at the same time, the material cannot completely fill the mould because the injection pressure is too low, and the instrument cannot be damaged because the injection pressure is too high, so that the method is preferable.
The pressure maintaining pressure of the injection molding machine is preferably 30-100MPa, the pressure maintaining time is preferably 90-180s, under the pressure maintaining condition, the relaxation motion of an oriented polymer chain can be slowed down, an oriented structure generated in the processing process is stored in a polymer product, the mechanical property of the obtained product is good, and meanwhile, the overlong processing time is avoided, and the production efficiency is preferably reduced.
The cooling speed of the material in the die is preferably 10-20 ℃/min, the cooling speed is too high, the product is warped after demolding and cooling due to too high internal temperature and too slow crystallization, and the slow cooling is favorable for better crystallization and molding of the ultra-high molecular weight polyethylene product and prevents collapse of the product, so the material is preferably used.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, a specific ultra-high molecular weight polyethylene composition and a specific injection molding process are adopted, and the bimodal polyethylene which can be uniformly mixed with the ultra-high molecular weight polyethylene at a molecular level is added, so that an ultra-high molecular weight polyethylene injection molding product with excellent mechanical properties and good processability is prepared, and the ultimate ultra-high molecular weight polyethylene injection molding product has the breaking strength of more than 80MPa, the tensile modulus of more than 1900MPa and the impact strength of more than 110MPa.
Drawings
FIG. 1 is a Differential Scanning Calorimetry (DSC) curve of the ultra high molecular weight polyethylene injection molded articles prepared in examples 1,2,3, 4 and comparative examples 1,2, 3;
FIG. 2 is a wide angle X-ray diffraction (WAXD) two-dimensional plot of the ultra high molecular weight polyethylene injection molded articles prepared in examples 1,2,3, 4 and comparative examples 1,2, 3.
FIG. 3 is a two-dimensional plot of small angle X-ray scattering (SAXS) for the ultra high molecular weight polyethylene injection molded articles prepared in examples 1,2,3, 4 and comparative examples 1,2, 3.
Detailed Description
The technical scheme of the present invention is further described by the following specific examples, but the present invention is not limited to the examples. Unless otherwise indicated, all materials used in the examples of the present invention are those commonly used in the art, and all methods used in the examples are those commonly used in the art.
The tensile breaking strength and tensile modulus of the ultra-high molecular weight polyethylene injection molding product are measured according to GB/T1040.2-2006;
The impact strength of the ultra-high molecular weight polyethylene injection molded article was measured with reference to GB/T1843-2008.
Example 1:
950g of ultra-high molecular weight polyethylene with weight average molecular weight of 3000000, 50g of bimodal polyethylene with weight average molecular weight of 900000 and molecular weight distribution of 50, 1000mg of antioxidant 1010 and 700mg of lubricant are added into a screw injection molding machine to obtain ultra-high molecular weight polyethylene products through injection molding. The temperature of the feeding section is 160 ℃, the temperature of the compression section is 238 ℃, the temperature of the homogenizing section is 240 ℃, the temperature of the passing nozzle is 240 ℃, the rotating speed of the screw is 15rpm, the injection pressure is 200MPa, the pressure maintaining pressure is 50MPa, the pressure maintaining time is 190s, the temperature of the die is 50 ℃, and the cooling speed is 10 ℃/min.
Example 2:
850g of ultra-high molecular weight polyethylene with weight average molecular weight 4500000, 150g of bimodal polyethylene with weight average molecular weight 800000 and molecular weight distribution 45 and 800mg of antioxidant 1076 are added into a screw injection molding machine to be injection molded to obtain an ultra-high molecular weight polyethylene product, wherein the temperature of a feeding section is 170 ℃ and the temperature of a compression section is 242 ℃ and the temperature of a homogenizing section is 245 ℃ in the injection molding process, the temperature of a passing nozzle is 245 ℃, the rotating speed of a screw is 35rpm, the injection pressure is 240MPa, the pressure maintaining pressure is 80MPa, the pressure maintaining time is 170s, the mold temperature is 40 ℃, and the cooling speed is 15 ℃/min.
Example 3:
750g of ultra-high molecular weight polyethylene with weight average molecular weight of 5400000, 250g of bimodal polyethylene with weight average molecular weight of 700000 and molecular weight distribution of 40, 500mg of lubricant, 700mg of antistatic agent and 800mg of radiation stabilizer are added into a screw injection molding machine to be injection molded to obtain an ultra-high molecular weight polyethylene product, wherein the temperature of a feeding section is 180 ℃, the temperature of a compression section is 248 ℃, the temperature of a homogenizing section is 250 ℃, the temperature of a passing nozzle is 250 ℃, the rotating speed of a screw is 75rpm, the injection pressure is 300MPa, the pressure maintaining pressure is 100MPa, the pressure maintaining time is 150s, the temperature of a mold is 40 ℃, and the cooling speed is 20 ℃/min.
Example 4:
600g of ultra-high molecular weight polyethylene with weight average molecular weight of 6800000, 400g of bimodal polyethylene with weight average molecular weight of 600000 and molecular weight distribution of 30, 700mg of lubricant, 600mg of colorant and 800mg of antimicrobial agent are added into a screw injection molding machine to be injection molded to obtain an ultra-high molecular weight polyethylene product, wherein the temperature of a feeding section is 190 ℃, the temperature of a compression section is 257 ℃, the temperature of a homogenizing section is 260 ℃, the temperature of a passing nozzle is 260 ℃, the rotating speed of a screw is 140rpm, the injection pressure is 150MPa, the pressure maintaining pressure is 28MPa, the pressure maintaining time is 100s, the temperature of a mold is 30 ℃, and the cooling speed is 25 ℃/min.
Comparative example 1:
Adding 500g of ultra-high molecular weight polyethylene with weight average molecular weight 6800000, 500g of bimodal polyethylene with weight average molecular weight 600000 and molecular weight distribution 30, 700mg of lubricant, 600mg of colorant and 800mg of antimicrobial agent into a screw injection molding machine for injection molding to obtain an ultra-high molecular weight polyethylene product, wherein the temperature of a feeding section is 190 ℃, the temperature of a compression section is 257 ℃, the temperature of a homogenizing section is 260 ℃, the temperature of a passing nozzle is 260 ℃, the rotating speed of a screw is 140rpm, the injection pressure is 150MPa, the pressure maintaining pressure is 28MPa, the pressure maintaining time is 100s, the temperature of a mold is 30 ℃, and the cooling speed is 25 ℃/min.
Comparative example 2:
750g of ultra-high molecular weight polyethylene with weight average molecular weight of 5400000, 250g of bimodal polyethylene with weight average molecular weight of 180000 and molecular weight distribution of 8, 500mg of lubricant, 700mg of antistatic agent and 800mg of radiation stabilizer are added into a screw injection molding machine to be injection molded to obtain an ultra-high molecular weight polyethylene product, wherein the temperature of a feeding section is 180 ℃, the temperature of a compression section is 248 ℃, the temperature of a homogenizing section is 250 ℃, the temperature of a passing nozzle is 250 ℃, the rotating speed of a screw is 75rpm, the injection pressure is 300MPa, the pressure maintaining pressure is 100MPa, the pressure maintaining time is 150s, the temperature of a mold is 40 ℃, and the cooling speed is 20 ℃/min.
Comparative example 3:
850g of ultra-high molecular weight polyethylene with weight average molecular weight of 4500000, 150g of bimodal polyethylene with weight average molecular weight of 800000 and molecular weight distribution of 45 and 800mg of antioxidant 1076 are added into a screw injection molding machine to be injection molded to obtain an ultra-high molecular weight polyethylene product, wherein the temperature of a feeding section is 170 ℃ and the temperature of a compression section is 276 ℃, the temperature of a homogenization section is 280 ℃, the temperature of a passing nozzle is 280 ℃, the rotating speed of a screw is 35rpm, the injection pressure is 240MPa, the dwell pressure is 80MPa, the dwell time is 170s, the temperature of a mold is 40 ℃, and the cooling speed is 15 ℃/min.
As can be seen from FIG. 1, the ultra-high molecular weight polyethylene products of examples 1, 2,3, 4 have higher melting points than those of comparative examples 1, 2,3, indicating that the products of examples 1, 2,3, 4 have more high melting point sh-kebab crystals than those of comparative examples 1, 2, 3.
Table 1 shows thermodynamic data, orientation data, tensile properties and impact property data of the ultra-high molecular weight polyethylene products prepared in examples 1, 2,3 and 4 and comparative examples 1, 2 and 3, and from the mechanical properties in Table 1, the tensile strength of examples 1, 2,3 and 4 is improved by 22.4 to 52.8%, the tensile modulus is improved by 14.2 to 41.6% and the impact strength is improved by 34.1 to 66.6% compared with comparative examples 1, 2 and 3.
As can be seen from FIG. 2, the degree of orientation of the samples in examples 1,2, 3 and 4 was calculated to be 0.27 to 0.38, and the degree of orientation of the samples in comparative examples 0.07 to 0.11, indicating the presence of a large amount of oriented crystals in the examples, using the ultra high molecular weight polyethylene products of examples 1,2, 3 and 4 to a higher degree than those of comparative examples 1,2 and 3.
As can be seen from fig. 3, the ultra-high molecular weight polyethylene products of examples 1,2, 3, and 4 were oriented to a higher degree than those of comparative examples 1,2, and 3, and more shish crystals were present.
Analytical example 4 and comparative example 1 found that the conditions were the same except for the content of the ultra-high molecular weight polyethylene and the bimodal polyethylene, and the results of the performance test showed that the ultra-high molecular weight polyethylene product of example 4 had an increased melting point of 1.9℃and an increased impact strength of 42.8%, and an increased tensile strength of 29.1%, indicating that the ultra-high molecular weight polyethylene product having an excessively low ultra-high molecular weight polyethylene content had a lower melting point and poorer mechanical properties.
Analytical example 3 and comparative example 2 found that the conditions were the same except that the molecular weight and molecular weight distribution were different, and the results of the performance test showed that the melting point of the ultra-high molecular weight polyethylene product using example 3 was increased by 3.5℃and the impact strength was increased by 52.4%, and the tensile strength was increased by 44.3%, indicating that the blending of the low molecular weight and low molecular weight distribution bimodal polyethylene resulted in lower melting point and poorer mechanical properties of the ultra-high molecular weight polyethylene product.
Analytical example 2 and comparative example 3 found that the conditions were the same except for the processing temperature, and the results of the performance test showed that the ultra-high molecular weight polyethylene product using example 2 had an increase in melting point of 4.3℃and crystallinity of 4.1%, an increase in impact strength of 43.3%, and an increase in tensile strength of 30.2%, indicating that an excessively high processing temperature would result in deterioration of the mechanical properties of the ultra-high molecular weight polyethylene composition.
The results show that the embodiment can prepare the ultra-high molecular weight polyethylene injection molding product with excellent mechanical property and good processing property by selecting the bimodal polyethylene with specific molecular weight and distribution and the ultra-high molecular weight polyethylene to form the multimodal polyethylene composition and simultaneously controlling the processing technology and controlling the flow field in the processing process to lead the ultra-high molecular weight polyethylene to induce the high molecular weight part of the bimodal polyethylene to form the shish crystal and other parts to form the kebab crystal.
TABLE 1
Claims (4)
1. An ultra-high molecular weight polyethylene product is obtained by adding an ultra-high molecular weight polyethylene composition into an injection molding machine for injection molding, wherein the ultra-high molecular weight polyethylene composition comprises 60-95% of ultra-high molecular weight polyethylene and 5-40% of bimodal polyethylene according to mass content, and the weight average molecular weight of the ultra-high molecular weight polyethylene is 2500000-8000000; the bimodal polyethylene has a weight average molecular weight of 400000-1000000 and a molecular weight distribution of 30-50; the bimodal polyethylene is a bimodal polyethylene without branched chains;
The temperature of the feeding section of the injection molding machine is 150-210 ℃, the temperature of the compression section is 230-260 ℃, the temperature of the homogenization section is 230-260 ℃, the temperature of a material passing through a nozzle is 230-260 ℃, the rotating speed of a screw is 10-200rpm, the injection pressure is 10-300MPa, the holding pressure is 8-120MPa, the holding time is 60-200s, the temperature of a die is 30-60 ℃, and the cooling speed of the material in the die is 8-25 ℃/min.
2. The ultra-high molecular weight polyethylene article of claim 1, the ultra-high molecular weight polyethylene composition comprising an auxiliary agent that is one or more of an antioxidant, a heat stabilizer, an antimicrobial agent, a flame retardant, a colorant, an antistatic agent, a lubricant, a slip agent, and a radiation stabilizer.
3. The ultra-high molecular weight polyethylene article of claim 1, wherein the temperature of the injection molding, homogenizing zone and passing nozzle is 240-250 ℃, and the injection pressure is 100-250MPa.
4. The preparation method of the ultra-high molecular weight polyethylene product comprises the steps of adding an ultra-high molecular weight polyethylene composition into an injection molding machine for injection molding, wherein the ultra-high molecular weight polyethylene composition comprises 60-95% of ultra-high molecular weight polyethylene and 5-40% of bimodal polyethylene according to mass content, and the weight average molecular weight of the ultra-high molecular weight polyethylene is 1500000-9000000; the weight average molecular weight of the bimodal polyethylene is 200000-1200000, and the molecular weight distribution is 20-60; the bimodal polyethylene is a bimodal polyethylene without branched chains; the temperature of the feeding section of the injection molding machine is 150-210 ℃, the temperature of the compression section is 230-260 ℃, the temperature of the homogenization section is 230-260 ℃, the temperature of a material passing through a nozzle is 230-260 ℃, the rotating speed of a screw is 10-200rpm, the injection pressure is 10-300MPa, the holding pressure is 8-120MPa, the holding time is 60-200s, the temperature of a die is 30-60 ℃, and the cooling speed of the material in the die is 8-25 ℃/min.
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