CN115340715A - Injection moldable high-abrasion-resistance high-density polyethylene and preparation method thereof - Google Patents
Injection moldable high-abrasion-resistance high-density polyethylene and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an injection moldable high-abrasion-resistance high-density polyethylene and a preparation method thereof, wherein the injection moldable high-abrasion-resistance high-density polyethylene is prepared from the following raw materials in parts by weight: 80-95 parts of high-density polyethylene resin A with molecular weight gradient distribution, 5-12 parts of reinforcing agent B with surface lubrication modification and 1-2 parts of antioxidant and ultraviolet-resistant stabilizer C, and a double-screw or single-screw blending modification device is utilized to carry out melt extrusion to obtain a lubricating material with high toughness, high wear resistance and enhanced hardness. The high-density polyethylene which can be injection molded and has high wear resistance and enhanced hardness and toughness solves the problem that ultrahigh molecular PE is difficult to perform injection molding processing through the high-density polyethylene with the gradient distribution of molecular weight, and simultaneously maintains good toughness and wear resistance basic characteristics; the hardness lubrication reinforcing agent for surface lubrication treatment is utilized to improve the rigidity and surface hardness of the material and realize excellent wear resistance.
Description
Technical Field
The invention belongs to the technical field of novel high polymer materials, and particularly relates to injection moldable high-abrasion-resistance high-density polyethylene and a preparation method thereof.
Background
Injection molding High Density Polyethylene (HDPE), a thermoplastic resin made by polymerizing ethylene monomers, generally has a melt index of more than 15 g/10 min, is non-toxic, tasteless, low in density, and superior to low pressure polyethylene in strength, rigidity, hardness and heat resistance. The high-frequency insulating material has good dielectric property and high-frequency insulating property, is not influenced by humidity, but is easy to age and crack at low temperature to obviously reduce the wear-resisting property. The method is suitable for manufacturing kitchen utensils, pipelines, mechanical parts, corrosion-resistant parts, insulating parts, films, plates and the like.
Ultra-high molecular weight polyethylene (UHMWPE) resin is a thermoplastic engineering plastic material with excellent overall properties, generally having a molecular weight greater than 100 ten thousand. The material has low density (only 1/8 of steel), excellent chemical resistance, can resist hydrochloric acid with concentration less than or equal to 37%, sulfuric acid with concentration less than 75%, nitric acid with concentration less than 20%, can resist alkali, salt and common organic solvents, has better weather resistance and low temperature resistance, is particularly suitable for the fields of rail transit, mines, paper making, chemical engineering and the like because the material has small friction coefficient and the surface is not easy to scale, and is used for manufacturing products such as bearing tiles, gears, valves, sealing fillers, artificial joints, skis and the like. Although the ultra-high molecular weight polyethylene resin has the advantages, the material has many disadvantages, such as high expansion coefficient, poor flow property and difficult forming. Only through special processing means such as powder hot-press molding, solvent gel spinning and other processes, products such as body armor fibers and gears, bearing tiles and bars can be prepared, but the mass production of the products is difficult to carry out through the conventional plastic injection molding process.
Injection molding high-density polyethylene HDPE is a common plastic material, and due to insufficient rigidity and low surface hardness, scratches and deformation are easily generated in the actual use process. Particularly under the action of outdoor sunlight and wind sand, the material can be aged more quickly to cause surface cracking, and the wear resistance is reduced remarkably.
Patent CN 109627595A aims at polypropylene materials, and improves the wear resistance of polypropylene by adding wear-resistant reinforcing agents such as bentonite, zeolite powder, and silicon nitride fiber, but quickly causes the toughness to decrease, and the weather resistance and long-term wear resistance of the polypropylene materials are not effectively improved.
Patent CN 112391006A utilizes polypropylene, high density polyethylene, long carbon chain nylon, compatilizer, antioxidant and lubricant, and through the synergistic effect of high density polyethylene and long carbon chain nylon, wear resistance and self-lubricating property of polypropylene are greatly improved, and the wear-resistant effect of the polypropylene cannot be attenuated along with the use process.
CN101003561A selects two types of resins of high-density polyethylene and ultrahigh molecular weight polyethylene, prepares an alloy material with higher film tensile tear strength through a type of composite dispersing agent with low melting point and low viscosity and cooperating with an elastomer, and the material does not show good surface hardness, rigidity and wear resistance.
In order to improve the wear resistance of the high polymer material, the wear resistance of the resin material is often improved by adding molybdenum disulfide, polytetrafluoroethylene and the like into the raw materials in the conventional mode, and the wear resistance of the material is also improved by adding talcum powder into the material for filling, but the improvement on the wear resistance is small, and the ductility of the material is rapidly reduced. Liquid lubricating oil such as mineral oil, silicone oil and the like is added to improve the lubricating and anti-wear properties of the material, but potential cross contamination exists, and small molecule lubricating oil is easy to age and lose efficacy in the long-term use process.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and title of the application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems and/or problems occurring in the prior art.
Therefore, the invention aims to overcome the defects in the prior art and provide the injection moldable high-abrasion-resistance high-density polyethylene.
In order to solve the technical problems, the invention provides the following technical scheme: an injection moldable high-abrasion-resistance high-density polyethylene, which is characterized in that: the described
The raw materials are as follows by weight percent: 80-95 parts of high-density polyethylene resin A with molecular weight gradient distribution, 5-12 parts of hardness lubrication reinforcing agent B with surface lubrication modification and 1-2 parts of antioxidant and ultraviolet-resistant stabilizer C, and a double-screw or single-screw blending modification device is utilized to carry out melt extrusion to obtain a lubricating material with high toughness, high wear resistance and enhanced hardness.
The preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: the high-density polyethylene with the molecular weight gradient distribution comprises ultrahigh-molecular-weight polyethylene (A1, UHMWPE) with the molecular weight more than 100 million, high-molecular-weight high-density polyethylene (A2, molecular weight 30-50 million, HMWHDPE) with the melt index of 3-15 g/10 min, and injection-molded-grade HDPE (A3, molecular weight-HDPE) with the melt index of 50-120 g/10 min, wherein the melt index test conditions are 190 ℃ and 21.6 kg.
The preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: the high-density polyethylene with graded molecular weight comprises the following components in percentage by weight: a1: a2: a3 is 15-55: 10 to 30:25 to 45.
The preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: in the surface lubrication modified hardness lubrication reinforcing agent B, the hardness lubrication reinforcing agent B1 is surface-modified superfine glass beads with the D50 particle size of 1-30 microns, the surface lubricant modifier B2 is surface-activated submicron and nanometer graphite micropowder, and the D50 average particle size is 20-500 nm.
The preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: the surface activation treatment of the hardness lubrication reinforcing agent B1 uses 0.2-2.0% of silane coupling agent.
The preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: the particle size ratio of B1 to B2 is 5-20: 1, the weight ratio of the components is 2-5: 1.
the preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: the silane coupling agent is a coupling agent KH550 or KH560.
The preferable scheme of the injection moldable high-abrasion-resistance high-density polyethylene is as follows: the antioxidant consists of an antioxidant 1010 and an antioxidant 168 in a weight ratio of 3.
Another object of the present invention is to overcome the disadvantages of the prior art, and to provide a method for preparing an injection moldable high abrasion resistance high density polyethylene, which is characterized in that: comprises the following steps
Preparing a wear-resistant reinforcing agent: taking 1.5-8 parts by weight of superfine graphite micropowder and 3-20 parts by weight of superfine glass beads treated by silane coupling agent, grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent;
and (3) extruding and granulating: taking 80-95 parts of high-density polyethylene with molecular weight gradient distribution, 1-2 parts of antioxidant and 5-20 parts of wear-resistant reinforcing agent by weight, adding into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene.
The preferable scheme of the preparation method of the invention is that: the length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
The invention has the beneficial effects that:
(1) The ultrahigh molecular weight polyethylene cooperates with the high molecular weight HDPE resin and the injection molding grade HDPE resin with the medium molecular weight in high flow to form a resin system with ultrahigh-high-medium molecular weight gradient, the ultra-long molecular chain of the ultrahigh molecular weight polyethylene is easy to form a plurality of winding points with the HDPE with a longer molecular chain, and the toughness and the wear resistance of the HDPE are greatly improved. The medium molecular weight injection molding HDPE not only maintains the good mechanical property of the material system, but also ensures that the material system has proper injection molding fluidity and high long-term stability.
(2) The surface modification is carried out on the high-hardness superfine glass beads through submicron/nanometer graphite micropowder to obtain a graphite micropowder modified glass bead superfine powder system, and the melting modification and blending are carried out on the high-density polyethylene system to obtain the composite material.
(3) The composite material part can form a compact and smooth layer with high hardness and low friction coefficient in the application of relative motion friction, so that the friction loss of the part is greatly reduced, and the lubricating performance of the material is improved. The material system overcomes the difficult problem that the ultra-high molecular polyethylene is difficult to process, and the small molecular lubrication system is easy to age and lose efficacy, and has the performance advantages of high-efficiency injection molding, enhanced hardness and high wear resistance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram of the preparation of the material in example 1 of the present invention.
FIG. 2 is a schematic view of lubrication enhancement in example 1 of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, specific embodiments thereof are described in detail below with reference to examples of the specification.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 15 parts, high molecular weight HDPE, melt index 5:40 parts, medium molecular weight HDPE, melt index 160:45 parts by weight, to obtain a resin mixture A;
a wear resistance enhancer; taking 3 parts of superfine graphite micropowder, 5 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of silane coupling agent KH550 by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent B;
antioxidant and anti-uv stabilizer: antioxidant 1010:0.2 part of antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorbent, and an ultraviolet light stabilizer 944:0.3 part.
And (3) other components: and 2 parts of the raw materials.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass microspheres treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
Example 2
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:25 parts, medium molecular weight HDPE, melt index 160:42 parts by weight, to obtain a resin mixture A;
a wear resistance enhancer; taking 3 parts of superfine graphite micropowder, 5 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of KH550 of the silane coupling agent by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent B;
antioxidant and uv-resistant stabilizer: antioxidant 1010:0.2 part of antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
Other components: and 2 parts of the raw materials.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture, the antioxidant and the wear-resistant reinforcing agent into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
Example 3
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 45 parts, high molecular weight HDPE, melt index 5:25 parts, medium molecular weight HDPE, melt index 160:42 parts by weight, to obtain a resin mixture A;
a wear resistance enhancer; taking 3 parts of superfine graphite micropowder, 5 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of KH550 of the silane coupling agent by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent B;
antioxidant and uv-resistant stabilizer: antioxidant 1010:0.2 part of antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
Other components: and 2 parts.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃, and the head temperature is 240-245 ℃.
Example 4
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:15 parts, medium molecular weight HDPE, melt index 160:40 parts by weight of a solvent, and mixing to obtain a resin mixture A;
a wear resistance enhancer; taking 2 parts of superfine graphite micropowder, 10 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of silane coupling agent KH550 by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent B;
antioxidant and anti-uv stabilizer: antioxidant 1010:0.2 part, antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
Other components: and 2 parts.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
Example 5
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:25 parts, medium molecular weight HDPE, melt index 160:42 parts by weight, to obtain a resin mixture A;
a wear resistance enhancer; taking 1 part of superfine graphite micropowder, 4 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of KH550 of the silane coupling agent by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent B;
antioxidant and anti-uv stabilizer: antioxidant 1010:0.2 part of antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorbent, and an ultraviolet light stabilizer 944:0.3 part.
And (3) other components: and 2 parts.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
Comparative example 1
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 5 parts, high molecular weight HDPE, melt index 5:5 parts, medium molecular weight HDPE, melt index 160:90 parts by weight of a solvent, and mixing to obtain a resin mixture A;
a wear resistance enhancer; taking 3 parts of superfine graphite micropowder, 5 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of KH550 of the silane coupling agent by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent B;
antioxidant and anti-uv stabilizer: antioxidant 1010:0.2 part, antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
And (3) other components: and 2 parts of the raw materials.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture, the antioxidant and the wear-resistant reinforcing agent into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃, and the head temperature is 240-245 ℃.
Comparative example 2
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:0 part, medium molecular weight HDPE, melt index 160:67 parts, to obtain a resin mixture A;
a wear resistance enhancer; taking 3 parts of superfine graphite micropowder, 5 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of silane coupling agent KH550 by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent B;
antioxidant and anti-uv stabilizer: antioxidant 1010:0.2 part, antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
Other components: and 2 parts.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃, and the head temperature is 240-245 ℃.
Comparative example 3
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:25 parts, medium molecular weight HDPE, melt index 160:42 parts by weight, to obtain a resin mixture A;
a wear resistance enhancer; taking 3 parts of superfine graphite micropowder, 0 part of superfine glass microsphere treated by silane coupling agent and 0.05 part of silane coupling agent KH550 by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent B;
antioxidant and uv-resistant stabilizer: antioxidant 1010:0.2 part, antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
Other components: and 2 parts.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
Comparative example 4
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:25 parts, medium molecular weight HDPE, melt index 160:42 parts by weight of a solvent, and mixing to obtain a resin mixture A;
a wear resistance enhancer; taking 0 part of superfine graphite micropowder, 5 parts of superfine glass microspheres treated by a silane coupling agent and 0.05 part of KH550 of the silane coupling agent by weight for treatment. Grinding for 1h by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent B;
antioxidant and uv-resistant stabilizer: antioxidant 1010:0.2 part of antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorber, 944 part of ultraviolet stabilizer: 0.3 part.
Other components: and 2 parts of the raw materials.
A method for treating the wear resistance enhancer; taking the superfine graphite micropowder and the superfine glass beads treated by the silane coupling agent according to the weight. Grinding for 1h by using a ball mill, and then treating for 20-30min by using a high-speed dispersion machine at the rotating speed of 1500-1800r/min to obtain a hardness lubrication reinforcing agent;
and (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
Comparative example 5
The high-wear-resistance high-density polyethylene is prepared from the following raw materials in parts by weight:
ultra-high molecular weight polyethylene A1, molecular weight 300 ten thousand: 33 parts, high molecular weight HDPE, melt index 5:25 parts, medium molecular weight HDPE, melt index 160:42 parts by weight of a solvent, and mixing to obtain a resin mixture A;
antioxidant and anti-uv stabilizer: antioxidant 1010:0.2 part, antioxidant 168:0.2 part, UV531-0.3 part of ultraviolet absorbent, and an ultraviolet light stabilizer 944:0.3 part.
Other components: and 2 parts.
And (3) taking the high-density polyethylene mixture, the antioxidant and the wear-resistant reinforcing agent according to the weight, adding the mixture, the antioxidant and the wear-resistant reinforcing agent into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene. The length-diameter ratio of the extruder is 35-48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃ and the head temperature is 240-245 ℃.
The raw materials are respectively put into an injection molding machine, the temperature of a charging barrel of the injection molding machine is controlled to be 230-240 ℃, and standard samples of six experimental raw materials are respectively processed by a standard sample strip mold. The test sample is placed at room temperature for 24h and then tested, the test environment temperature is 25 ℃, the relative humidity is 60%, and the notched impact strength of the cantilever beam is tested according to GB/T1843-2008; the Shore hardness is tested according to GB/T24112; the abrasion resistance test mode is that a sample is made into a sample of 20mm x 3mm, the sample is rotated to 2000 revolutions under the condition that the load mass is 1kg on an HT-1000 high-temperature friction abrasion tester, the mass loss is recorded, and the mass loss rate is calculated to represent the abrasion resistance of the sample.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. An injection moldable high-abrasion-resistance high-density polyethylene, which is characterized in that: the raw materials comprise the following components in percentage by weight
80-95 parts of high-density polyethylene resin A with molecular weight gradient distribution, 5-12 parts of hardness lubrication reinforcing agent B with surface lubrication modification and 1-2 parts of antioxidant and ultraviolet-resistant stabilizer C, and a double-screw or single-screw blending modification device is utilized to carry out melt extrusion to obtain a lubricating material with high toughness, high wear resistance and enhanced hardness.
2. The injectable high abrasion-resistant high density polyethylene according to claim 1, wherein said high density polyethylene with gradient molecular weight distribution comprises ultra high molecular weight polyethylene (A1, UHMWPE) with molecular weight more than 100 ten thousand, high molecular weight high density polyethylene (A2, molecular weight 30-50 ten thousand, HMWHDPE) with melt index in 3-15 g/10 min, and injection grade HDPE (A3, molecular weight-HDPE) with melt index in 50-120 g/10 min, with melt index test conditions of 190 ℃ and 21.6 kg.
3. The gradient molecular weight distribution high density polyethylene of claim 2, wherein the gradient molecular weight distribution high density polyethylene comprises, in percent by weight: a1: a2: a3 is 15-55: 10 to 30:25 to 45.
4. The polyethylene of claim 1, wherein the surface lubricant-modified hardness lubricant reinforcing agent B comprises surface-modified superfine glass beads with D50 particle size of 1-30 μm, and the surface lubricant modifier B2 comprises surface-activated submicron and nanometer graphite micropowder with D50 average particle size of 20-500 nm.
5. The lubricated hard reinforcing agent B1 according to claim 4, wherein the silane coupling agent is used in an amount of 0.2% to 2.0% for the surface activation treatment of the lubricated hard reinforcing agent B1.
6. The injection-moldable high-abrasion-resistance high-density polyethylene according to claim 4, wherein the particle size ratio of B1 to B2 is 5-20: 1, the weight ratio of the components is 2-5: 1.
7. the injection moldable high abrasion high density polyethylene of claim 4, wherein said silane coupling agent is the coupling agent KH550, KH560.
8. The injection moldable high-abrasion-resistance high-density polyethylene according to claim 1, wherein the antioxidant comprises an antioxidant 1010 and an antioxidant 168 in a weight ratio of 3.
9. The method for preparing an injection moldable high abrasion resistance high density polyethylene according to claim 1, comprising the steps of:
preparing a wear-resistant reinforcing agent: taking 1.5-8 parts of superfine graphite micro powder and 3-20 parts of superfine glass beads treated by a silane coupling agent by weight, grinding for 1 hour by using a ball mill, and then treating for 20-30min at the rotating speed of 1500-1800r/min by using a high-speed dispersion machine to obtain a hardness lubrication reinforcing agent;
and (3) extruding and granulating: and taking 80-95 parts by weight of high-density polyethylene with molecular weight gradient distribution, 1-2 parts by weight of antioxidant and 5-20 parts by weight of wear-resistant reinforcing agent, adding into a hopper of an extruder, and performing extrusion granulation by using the extruder to obtain the injection-moldable high-wear-resistant high-density polyethylene.
10. The method of claim 9, wherein the extruder has an aspect ratio of 35 to 48:1, the first-stage temperature of the extruder is 100-150 ℃, the second-stage temperature is 225-230 ℃, the third-stage temperature is 240-242 ℃, the fourth-stage temperature is 235-245 ℃, and the head temperature is 240-245 ℃.
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| CN116426054B (en) * | 2023-04-07 | 2023-11-10 | 云南惠强塑料制品有限公司 | Whisker modified high-density polyethylene composition |
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