阅读说明：本技术 研磨棍及其制备方法和应用 (Grinding rod and preparation method and application thereof ) 是由 傅如学 于 2019-11-16 设计创作，主要内容包括：本发明提供了一种研磨棍及其制备方法和应用,涉及研磨材料技术领域,所述研磨棍的原料包括树脂基料和磨料颗粒,所述树脂基料包括聚酰胺、超高分子量聚乙烯、线性低密度聚乙烯和三元乙丙橡胶,且四者的质量比为(45-80):(2-27):(1-20):(1-20),所述研磨棍缓解了现有研磨棍在高速研磨时,易于在研磨件表面留下污渍的技术问题。本发明提供的研磨棍通过采用特定质量配比的聚酰胺、超高分子量聚乙烯、线性低密度聚乙烯和三元乙丙橡胶相互协同得到的树脂基料与磨料颗粒相互配合,使得研磨棍不仅具有优异的耐磨性能,而且在高速干式研磨条件下,也具有优异的防沾污性能,从而能够有效提高被研磨产品的成品率。(The invention provides a grinding rod and a preparation method and application thereof, and relates to the technical field of grinding materials, wherein the raw materials of the grinding rod comprise a resin base material and abrasive particles, the resin base material comprises polyamide, ultra-high molecular weight polyethylene, linear low density polyethylene and ethylene propylene diene monomer, the mass ratio of the resin base material to the abrasive particles is (45-80): 2-27): 1-20, and the grinding rod relieves the technical problem that stains are easy to leave on the surface of a grinding piece when the existing grinding rod is used for high-speed grinding. According to the grinding rod provided by the invention, the resin base material obtained by mutually cooperating the polyamide, the ultra-high molecular weight polyethylene, the linear low density polyethylene and the ethylene propylene diene monomer rubber in a specific mass ratio is matched with the abrasive particles, so that the grinding rod not only has excellent wear resistance, but also has excellent anti-contamination performance under a high-speed dry grinding condition, and the yield of ground products can be effectively improved.)

1. A grinding rod is characterized in that raw materials of the grinding rod comprise a resin base material and abrasive particles, wherein the resin base material comprises polyamide, ultra-high molecular weight polyethylene, linear low density polyethylene and ethylene propylene diene monomer, and the mass ratio of the polyamide to the ultra-high molecular weight polyethylene to the linear low density polyethylene to the ethylene propylene diene monomer is (45-80) to (2-27) to (1-20), preferably (50-78) to (3-23) to (3-14) to (2-13), more preferably (52-76) to (6-23) to (5-11) to (3-10).

2. The grinding roll of claim 1 wherein the mass ratio of abrasive particles to resin matrix is (5-100):100, preferably (11-100): 100, more preferably (18-100): 100, respectively;

preferably, the abrasive particles have a particle size of 30-320 mesh.

3. The grinding roll of claim 1 wherein the abrasive particles comprise at least one of silica, alumina, silicon carbide, white corundum, chrome corundum, single crystal corundum, synthetic diamond, and cubic boron nitride, preferably a mixture of silicon carbide and white corundum.

4. The grinding bar of any of claims 1-3, wherein the polyamide comprises a fully aliphatic polyamide having repeating units comprising at least one of formula I and formula II:

-CO-C₄H₈-CO-NH-C₆H₁₂-NH-formula I

-NH(CH₂)₆NH-CO(CH₂)₄CO-formula II.

5. The grinding bar of any one of claims 1-3 wherein the polyamide monomers include at least one of hexamethylene adipamide, derivatives of hexamethylene adipamide, hexamethylene sebacamide and derivatives of hexamethylene sebacamide;

preferably, the hexamethylene adipamide derivative includes an aliphatic alkylene group having 4 to 12 carbon atoms, preferably an aliphatic alkylene group having 4 to 8 carbon atoms, and more preferably at least one of hexylene, butylene, and octylene.

6. The grinding bar of any one of claims 1-3, wherein the ultra high molecular weight polyethylene has a number average molecular weight of 150 to 170 ten thousand;

preferably, the number average molecular weight of the linear low density polyethylene is 5 to 15 ten thousand;

preferably, the Mooney viscosity of the ethylene propylene diene monomer is 40-60;

preferably, the polyamide has a number average molecular weight of 2 to 3 ten thousand.

7. The grinding roll of any of claims 1-3 wherein the material of the grinding roll further comprises a compatibilizer;

preferably, the compatibilizer comprises at least one of maleic anhydride grafted ethylene octene copolymer, maleic anhydride grafted polypropylene, stearic acid, and POE;

preferably, the compatibilizer is used in an amount of 0.5 to 3 wt% of the resin binder.

8. A method of making a grinding bar according to any of claims 1 to 7, comprising the steps of:

providing a mixture of a resin binder, abrasive particles and optionally a compatibilizer, and shaping the mixture to obtain an abrasive stick.

9. The method of claim 8, wherein the mixture is heated to form a melt and then injection molded to form the grinding rod.

10. Use of a grinding roll according to any of claims 1-7 in a process for the abrasive treatment of metal parts.

Technical Field

The invention relates to the technical field of grinding materials, in particular to a grinding rod and a preparation method and application thereof.

Background

Grinding rods are widely used in industry, and are mainly used for dust prevention, polishing, cleaning, grinding and other treatments of the surface of a workpiece to be ground, such as metal. The grinding rod commonly used at present is generally manufactured by melt injection molding using thermoplastic resin, abrasive particles and the like as main raw materials. Grinding rolls are used primarily in industry to finish, polish, grind, deburr, chamfer, etc. metal workpieces.

However, when the conventional polishing roller is used at a high polishing rate (a polishing rate higher than 1000RPM), particularly in dry polishing, stains are left on the surface of the workpiece to be polished, resulting in a low yield of the workpiece to be polished.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a novel grinding roller, which solves the technical problem that stains are easy to leave on the surface of a grinding piece when the conventional grinding roller is used for high-speed grinding.

The grinding rod provided by the invention comprises a resin base material and abrasive particles, wherein the resin base material comprises polyamide, ultrahigh molecular weight polyethylene, linear low density polyethylene and ethylene propylene diene monomer, and the mass ratio of the polyamide to the ultrahigh molecular weight polyethylene to the linear low density polyethylene is (45-80): (2-27): (1-20), preferably (50-78): (3-23): (3-14): (2-13), more preferably (52-76): (6-23): (5-11): (3-10).

Preferably, the abrasive particles have a particle size of 30-320 mesh.

Further, the abrasive particles include at least one of silica, alumina, silicon carbide, white corundum, chrome corundum, single crystal corundum, synthetic diamond, and cubic boron nitride, and preferably a mixture of silicon carbide and white corundum.

Further, the polyamide comprises a fully aliphatic polyamide, wherein the repeating unit of the fully aliphatic polyamide comprises at least one of the following formulas I and II:

-CO-C₄H₈-CO-NH-C₆H₁₂-NH-formula I

-NH(CH₂)₆NH-CO(CH₂)₄CO-formula II.

Further, the monomer of the polyamide comprises at least one of hexamethylene adipamide, hexamethylene adipamide derivatives, hexamethylene sebacamide and hexamethylene sebacamide derivatives;

preferably, the hexamethylene adipamide derivative includes an aliphatic alkylene group having 4 to 12 carbon atoms, preferably an aliphatic alkylene group having 4 to 8 carbon atoms, and more preferably at least one of hexylene, butylene, and octylene.

Further, the number average molecular weight of the ultra-high molecular weight polyethylene is 150-170 ten thousand;

preferably, the linear low density polyethylene has a number average molecular weight of 5 to 15 ten thousand;

preferably, the mooney viscosity of the ethylene propylene rubber is 40-60;

preferably, the polyamide has a number average molecular weight of 2 to 3 ten thousand.

The raw materials of the grinding rod also comprise a compatilizer;

preferably, the compatibilizer comprises at least one of maleic anhydride grafted ethylene octene copolymer, maleic anhydride grafted polypropylene, stearic acid, and POE;

preferably, the compatibilizer is used in an amount of 0.5 to 3 wt% of the resin binder.

The invention also aims to provide a preparation method of the grinding rod, which comprises the following steps:

providing a mixture of a resin binder, abrasive particles and optionally a compatibilizer, and shaping the mixture to obtain an abrasive stick.

Further, the mixture is heated into a melt and then injection molded to obtain the grinding rod.

The invention also aims to provide the application of the grinding rod in the metal part grinding treatment process.

According to the grinding rod provided by the invention, the resin base material obtained by mutually cooperating polyamide, ultrahigh molecular weight polyethylene, linear low density polyethylene and ethylene propylene diene monomer rubber in a specific mass ratio is matched with the abrasive particles, so that the grinding rod not only has excellent wear resistance, but also has excellent anti-contamination performance under a high-speed dry grinding condition, and the yield of ground products can be effectively improved.

The preparation method of the grinding rod provided by the invention has the advantages of simple process, convenience in operation, easiness in realization of industrial mass production, saving of manpower and material resources and reduction of cost.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to one aspect of the present invention, there is provided an abrasive roll whose raw materials include a resin base including polyamide, ultra-high molecular weight polyethylene, linear low density polyethylene, and ethylene-propylene-diene monomer, and abrasive particles, and whose mass ratio is (45-80): 2-27): 1-20, preferably (50-78): 3-23): 3-14): 2-13, more preferably (52-76): 6-23): 5-11): 3-10.

Typically, but not by way of limitation, the mass of polyamide, ultra high molecular weight polyethylene, linear low density polyethylene and ethylene propylene diene monomer in the resin base is, for example, 75:12:8:5, 60:22:10:8, 70:12:8:10, 65:18:9:8 or 65:18:7: 10.

According to the invention, the polyamide, the ultrahigh molecular weight polyethylene, the linear low density polyethylene and the ethylene propylene diene monomer rubber which are in a specific mass ratio are mutually cooperated to serve as the resin base material, and the grinding rod prepared by mutually cooperating the resin base material and the grinding particles has excellent wear resistance and excellent anti-contamination performance under a high-speed dry grinding condition, so that the yield of ground products can be effectively improved.

In a preferred embodiment of the present invention, the mass ratio of the abrasive particles to the resin base is (5-100):100, preferably (11-100): 100, more preferably (18-100): 100.

typically, but not limitatively, in the raw materials of the grinding rod provided by the present invention, the mass ratio of the abrasive particles to the resin base material is, for example, 5:100, 8:100, 10:100, 11:100, 15:100, 18:100, 20:100, 25:100, 30:100, 40:100, 50:100, 53:100, 60:100, 66:100, 70:100, 80:100, 90: 100 or 100: 100.

By controlling the mass ratio of the abrasive particles to the resin base material to be (5-100):100, the grinding rod has excellent wear resistance and excellent anti-contamination performance under high-speed dry grinding conditions, and when the mass ratio of the abrasive particles to the resin base material is (11-66): when the mass ratio of the abrasive grains to the resin base is (18-53):100, the abrasion resistance and the contamination resistance of the grinding roll are more excellent.

In a preferred embodiment of the present invention, the abrasive particles have a particle size of 30 to 320 mesh.

Typically, but not by way of limitation, the abrasive particles have a particle size of 30, 36, 46, 70, 80, 100, 120, 140, 180, 200, 230, or 320 mesh.

By controlling the particle size of the abrasive particles, the resin base material and the abrasive particles are mixed more uniformly, and the prepared grinding rod has more excellent wear resistance.

In a preferred embodiment of the present invention, the abrasive particles include at least one of silica, alumina, silicon carbide, white corundum, chrome corundum, single crystal corundum, synthetic diamond, and Cubic Boron Nitride (CBN), preferably a mixture of silicon carbide and white corundum.

The term "at least one" means that the abrasive particles may include silicon dioxide, aluminum oxide, silicon carbide, green silicon carbide, cubic silicon carbide, white corundum, chrome corundum, single crystal corundum, synthetic diamond, and Cubic Boron Nitride (CBN), or a mixture of two or more of the above substances, and particularly, when the abrasive particles are a mixture of silicon carbide and white corundum, the wear resistance of the obtained grinding rod is better.

In a preferred embodiment of the present invention, the polyamide comprises a fully aliphatic polyamide having repeating units comprising at least one of the following formulae I and ii:

-CO-C₄H₈-CO-NH-C₆H₁₂-NH-formula I

-NH(CH₂)₆NH-O(CH₂)₄CO-formula II.

The above-mentioned "at least one" means that the repeating unit of the wholly aliphatic polyamide may include either-CO-C₄H₈-CO-NH-C₆H₁₂-NH-or-NH (CH)₂)₆NH-CO(CH₂)₄CO-may also include both-CO-C₄H₈-CO-NH-C₆H₁₂-NH-, in turn comprising-NH (CH)₂)₆NH-CO(CH₂)₄CO-。

In a preferred embodiment of the present invention, the monomer of the polyamide comprises at least one of hexamethylene adipamide, a hexamethylene adipamide derivative, hexamethylene sebacamide and a hexamethylene sebacamide derivative.

The "at least one type" means that the monomer of the polyamide may be any one of hexamethylene adipamide, a hexamethylene adipamide derivative, hexamethylene sebacamide and a hexamethylene sebacamide derivative, or may be a copolymer of at least two or more types of the monomers.

In a preferred embodiment of the invention, the hexamethyleneadipamide derivative comprises an aliphatic alkylene group having 4 to 12 carbon atoms, so that the resulting grinding rod has a high hardness and a high tensile strength, and particularly when the hexamethyleneadipamide derivative comprises an aliphatic alkylene group having 4 to 8 carbon atoms, the mechanical properties of the resulting grinding rod are more excellent, and particularly when the hexamethyleneadipamide derivative comprises one or more of hexylene, butylene and octylene.

In a preferred embodiment of the present invention, the sebacoyl hexanediamine is a nano modified nylon plastic obtained by using nano attapulgite, nano hydroxyapatite and a melt intercalation composite technology to produce a raw material base material by using polyamide PA as a base material, wherein the content of the nano inorganic phase material attapulgite in the nano modified nylon plastic is generally less than 10 wt%, usually only 3-5 wt%, and the content of the nano hydroxyapatite is generally less than 12 wt%, usually only 3-6 wt%.

In a preferred embodiment of the present invention, the number average molecular weight of the ultra-high molecular weight polyethylene is 150-170 ten thousand.

Typically, but not by way of limitation, the ultra-high molecular weight polyethylene has a number average molecular weight of, for example, 150 ten thousand, 152 ten thousand, 155 ten thousand, 158 ten thousand, 160 ten thousand, 162 ten thousand, 165 ten thousand, 168 ten thousand, or 170 ten thousand.

The grinding rod is prepared by selecting the ultra-high molecular weight polyethylene with the number average molecular weight of 150-170 ten thousand as the raw material of the resin base material and cooperating with other raw materials, so that the grinding rod has excellent wear resistance.

In a preferred embodiment of the invention, the ultra high molecular weight polyethylene has a density of 0.94 to 0.975g/cm³。

Typically, but not by way of limitation, the ultra-high molecular weight polyethylene has a density of, for example, 0.94, 0.945, 0.95, 0.955, 0.96, 0.965, 0.97 or 0.975g/cm³. In a preferred embodiment of the invention, the linear low density polyethylene has a number average molecular weight of from 5 to 15 ten thousand.

Typically, but not by way of limitation, the linear low density polyethylene has a number average molecular weight of, for example, 5 ten thousand, 8 ten thousand, 10 ten thousand, 12 ten thousand, or 15 ten thousand.

The linear low-density polyethylene with the number average molecular weight of 5-15 ten thousand, the polyethylene with the ultrahigh molecular weight, the polyamide and the ethylene propylene diene monomer are selected to be mutually cooperated, so that the flow property of the resin base material after heating and melting is improved according to similar compatible raw materials, and the subsequent processing and forming are facilitated.

In a preferred embodiment of the invention, the linear low density polyethylene has a density of from 0.92 to 0.94g/cm³。

Typically, but not by way of limitation, the linear low density polyethylene has a density of, for example, 0.92, 0.925, 0.93, 0.935 or 0.94g/cm³。

In a preferred embodiment of the invention, the ethylene-propylene-diene rubber has a Mooney viscosity of from 40 to 60.

The Mooney viscosity mentioned above means Z100 ℃ 1+4, where Z is 40-60, Z-rotational viscosity value; 1-preheating time is 1 min; 4-rotation time is 4 min; the test temperature is 100 ℃ to 100 ℃.

Typically, but not by way of limitation, ethylene propylene diene monomer rubber has a mooney viscosity of, for example, 40, 42, 45, 48, 50, 52, 55, 58, or 60.

The grinding rod prepared by the ethylene propylene diene monomer and other raw materials cooperatively has excellent toughness by controlling the Mooney viscosity of the ethylene propylene diene monomer to be 40-60.

In a preferred embodiment of the invention, the polyamide has a number average molecular weight of from 2 to 3 ten thousand.

Typically, but not by way of limitation, the polyamide has a number average molecular weight of, for example, 2 ten thousand, 2.2 ten thousand, 2.5 ten thousand, 2.8 ten thousand, or 3 ten thousand.

In a preferred embodiment of the invention, the polyamide comprises (PA6, PA66, PA610, PA612, PA1010, PA11, PA12, PA46, PA47)

In a preferred embodiment of the present invention, the ultra-high molecular weight polyethylene comprises millioninxm 220 from mitsui japan and/or taconant GUR5113 from U.S. a.

In a preferred embodiment of the invention, the linear low density polyethylene comprises medium petroleum kunlun DFDA7042N and/or medium petrochemical DFDC-7050.

In a preferred embodiment of the invention, the ethylene propylene diene monomer rubber comprises at least one of Japan Triwell EPDM3092PM, Japan Triwell EPDM 3090EM, or United states Dow NORDEL IP 4570.

In a preferred embodiment of the present invention, the material of the grinding rod further comprises a compatibilizer. The raw materials of the grinding rod are added with the compatilizer, so that the components in the resin base material and the grinding particles are mixed more uniformly and have better compatibility, and the performance of the grinding rod prepared by subsequent processing is more excellent.

In a preferred embodiment of the present invention, the compatibilizer comprises at least one of a maleic anhydride grafted ethylene octene copolymer, a maleic anhydride grafted polypropylene, stearic acid 1810, and POE.

In the present invention, POE is a polyolefin elastomer.

The above-mentioned "at least one" means that the compatibilizer may include one or a mixture of two or more of maleic anhydride-grafted ethylene octene copolymer, maleic anhydride-grafted polypropylene, stearic acid, and POE.

In a preferred embodiment of the invention, the stearic acid is eastern horse technical grade stearic acid 1810.

In a preferred embodiment of the present invention, POE is a high melting ester POE, preferably POE dow 8402.

In a preferred embodiment of the invention, the compatibilizer is 0.5 to 3 weight percent of the resin binder.

Typically, but not by way of limitation, the compatibilizer is used in an amount of 0.5, 0.8, 1, 1.5, 2, 2.5, or 3 weight percent of the resinous binder.

According to a second aspect of the present invention, there is provided a method of making the above grinding roller, comprising the steps of: providing a mixture of a resin binder, abrasive particles and optionally a compatibilizer, and shaping the mixture to obtain an abrasive stick.

The preparation method of the grinding rod provided by the invention has the advantages of simple process, convenience in operation, easiness in realization of industrial mass production, saving of manpower and material resources and reduction of cost.

In a preferred embodiment of the invention, the mixture is heated to a melt and then injection molded to provide the grinding rod.

The injection molding mode is easier to grind the molding processing of the roller, and is more beneficial to reducing the cost.

According to a third aspect of the present invention, the present invention provides the use of the above grinding roller in a process for grinding metal members.

After the grinding rod provided by the invention is used for grinding the metal piece, the grinding piece is smooth and flat, and no stain is left on the surface of the metal piece even under the high-speed dry grinding condition, so that the finished product rate of the metal piece processing is effectively improved, and the grinding rod has a wide application prospect.

In a preferred embodiment of the present invention, metal articles include, but are not limited to, steel grade N06600 wire and steel grade Q235B sheet material.

The steel grade N06600 wire belongs to nickel-chromium alloy, has better corrosion resistance than 200 and 201 low-carbon alloy, particularly has outstanding performance of resisting dry chlorine and hydrogen chloride, oxidation and carbonization corrosion, and is difficult to remove surface oxide scale in the common pickling process, namely the required time is 14-24 hours. Due to the uneven thickness of the oxide scale on the wire surface, the peeling rate of the local surface layer thickness (300- & ltmu.m) is poor, and the thickness (150- & ltmu.m) can be washed by acid. However, the peeling rate in the case of pickling is only 85 to 90%. The peeling rate of the grinding rod reaches 99 percent after grinding treatment, the production rate is improved by 2 to 4 times compared with the acid washing process, and the grinding rod does not cause peracid phenomenon and environmental pollution. The loss rate of the steel is controlled to be 0.5-0.8%.

The steel grade Q235B sheet was a low carbon steel. Has certain elongation and strength, good toughness and castability, easy stamping and welding, and 30-50 μm of surface oxide scale thickness. Because the plate is uniformly insulated in the cooling process, the thickness of the oxide skin is thinner, and the adsorption force of the thin oxide skin on the surface of the steel is stronger. The common acid washing needs to pass through salt bath and sulfuric acid pine bark. And the acid-mixing peeling process is complex, the production efficiency is low, the operation risk is high, and the environmental pollution is serious.

The grinding rod provided by the invention is used for grinding the steel grade Q235B plate instead of an acid pickling process for peeling, the production process is simpler, the peeling rate is higher and can reach 99.5%, the production rate is improved by 2-4 times compared with the acid pickling process, and the grinding rod is free of danger and can not cause environmental pollution. The loss rate of the steel is controlled to be 0.4-0.7%, which is slightly lower than that of the common pickling process.

In a preferred embodiment of the present invention, grinding rods with different lengths and diameters can be selected according to different conditions of the metal workpiece to be ground, and grinding rods with different combinations of base materials and abrasive particles are selected according to the quality of the material and the requirements of customers, so as to better improve the productivity and quality rate of the product. Grinding rod types such as:

preference is given to

More preferably

The length-diameter ratio is optimized according to different shapes.

In a preferred embodiment of the invention, the grinding roller is fixed on the roller core, and the roller core is driven by the motor to rotate at a high speed, so that the grinding roller is driven to remove an oxide layer on the surface of the metal piece in a grinding and brushing manner, the surface of the metal piece is bright as new, and meanwhile, the treatment process is environment-friendly and pollution-free.

The technical scheme provided by the invention is further explained by combining the embodiment and the comparative example.