Water milling rubber and plastic polishing part material and preparation method thereof

Abstract

The invention particularly relates to a water milling rubber and plastic polishing part material and a preparation method thereof. The water milling rubber and plastic polishing part material is prepared from 15 to 25 parts of EVA (Ethylene-Vinyl Acetate), 12 to 20 parts of EPDM (Ethylene-Propylene-Diene Monomer), 14 to 20 parts of polyethylene, 10 to 18 parts of natural rubber, 4 to 10 parts of nitrile rubber, 30 to 45 parts of a grinding material, 2 to 4 parts of an antioxidant, 2 to 6 parts of a foaming agent, 2 to 6 parts of a silane coupling agent and 0.2 to 0.5 part of a vulcanizing agent. The water mill rubber and plastic polishing part material has good mechanical properties, wear resistance, high temperature resistance and corrosion resistance, and is beneficial to improvement of durability and polishing effect. The preparation method is stable in process, convenient to operate and control, high in production efficiency and beneficial to industrial production.

Description

Technical Field

[0001] The present invention relates to the technical field of polishing materials, and particularly relates to a water-based polishing material for rubber and plastic parts and a preparation method thereof. Background Art

[0002] In industrial production, it is often necessary to use polishing parts such as polishing wheels and polishing pads to polish the surfaces of materials such as metals, ceramics, and glasses. Among them, the polishing part material is the core material for realizing the fine processing of the workpiece surface, and has an important impact on the polishing effect of the polishing part material. With the improvement of high-end manufacturing, precision machining, and environmental protection requirements, the market has put forward higher demands on the wear resistance, high-temperature stability, and corrosion resistance of polishing part materials. However, the existing polishing wheel materials have certain limitations in terms of wear resistance, high-temperature resistance, and corrosion resistance, resulting in a short service life. In the actual production process, frequent replacement not only increases the production cost but also affects the improvement of production efficiency. Therefore, it is of great significance to develop an environmentally friendly polishing wheel material with good wear resistance, high-temperature resistance, and corrosion resistance. Summary of the Invention

[0003] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the present invention is to provide a water-based polishing material for rubber and plastic parts, which has good mechanical properties, wear resistance, high-temperature resistance, and corrosion resistance, and helps to improve the durability and polishing effect.

[0004] Another purpose of the present invention is to provide a preparation method of a water-based polishing material for rubber and plastic parts, the preparation method has stable process, convenient operation control, high production efficiency, and is conducive to industrial production.

[0005] The purpose of the present invention is achieved by the following technical solutions: A water-based polishing material for rubber and plastic parts, comprising 15-25 parts of EVA, 12-20 parts of EPDM, 14-20 parts of polyethylene, 10-18 parts of natural rubber, 4-10 parts of nitrile rubber, 30-45 parts of abrasive, 3-6 parts of compatibilizer, 2-4 parts of antioxidant, 2-6 parts of foaming agent, 2-6 parts of silane coupling agent, and 0.2-0.5 parts of vulcanizing agent.

[0006] The present invention forms a polymer matrix by compounding a rubber system formed by combining EVA, polyethylene with EPDM, natural rubber and nitrile rubber, and combining additives such as antioxidants, foaming agents, silane coupling agents, etc., so as to provide support and protection for abrasives; the abrasives have high hardness and wear resistance, are evenly dispersed in the polymer matrix, can withstand greater pressure and friction during the polishing process, and play a role in grinding and polishing; the polymer matrix is ​​firmly combined with the polymer matrix, and the prepared water-abrasive rubber-plastic polishing piece material has good mechanical properties, wear resistance, high temperature resistance and corrosion resistance, and the polishing piece material has a cellular structure, can store and release polishing, and effectively improves polishing efficiency and polishing quality.

[0007] Furthermore, the polyethylene is low-density polyethylene.

[0008] Furthermore, the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant.

[0009] Furthermore, the foaming agent is at least one of azodicarbonamide, 4,4'-oxybisbenzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide and sodium bicarbonate.

[0010] Furthermore, the foaming agent is composed of azodicarbonamide, p-toluenesulfonyl hydrazide and sodium bicarbonate in a weight ratio of 2-4:0.5-1.5:0.5-1.5.

[0011] Furthermore, the vulcanizing agent is at least one of dicumyl peroxide, di-tert-butyl peroxide, bis-(tert-butylperoxyisopropyl)benzene and triallyl isocyanurate.

[0012] Furthermore, the silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane and vinyltrimethoxysilane.

[0013] Furthermore, the compatibilizer is at least one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene and styrene-ethylene-butylene-styrene block copolymer.

[0014] Furthermore, the abrasive is at least one of corundum and silicon carbide, and the particle size of the abrasive is 20-40 μm.

[0015] Another object of the present invention is achieved by the following technical solution: A method for preparing the above-mentioned environmentally friendly polishing material for abrasive rubber and plastic comprises the following steps:

[0016] (1) adding EVA, EPDM, polyethylene and a compatibilizer into an internal mixer for mixing, and then adding a plasticized natural rubber and a nitrile rubber mixed rubber and a vulcanizing agent for mixing to obtain a rubber compound 1;

[0017] (2) Add the abrasive that has been pre-activated with a silane coupling agent and a foaming agent and an antioxidant to Rubber Compound 1, and then carry out mixing to obtain Rubber Compound 2;

[0018] (3) Place Rubber Compound 2 in a mold for compression molding, and then carry out cooling and demolding to obtain Rubber Compound 3;

[0019] (4) Place Rubber Compound 3 in an oven for heat treatment, and then carry out surface finishing to make its size and surface quality meet the requirements, obtaining the polishing part material.

[0020] Furthermore, in step (1), add EVA, EPDM, polyethylene, and a compatibilizer to a mixer for mixing. The mixing temperature is 115 - 125 °C, and the mixing time is 2 - 6 min. Then add the kneaded natural rubber and nitrile rubber blend and a vulcanizing agent for mixing. The mixing temperature is 115 - 125 °C, and the mixing time is 5 - 10 min to obtain Rubber Compound 1.

[0021] Furthermore, in step (1), the kneading method of the natural rubber and nitrile rubber blend includes the following steps: Place the natural rubber and nitrile rubber on a two-roll mill for kneading. The roll gap is controlled at 0.5 - 1 mm, the roll temperature is controlled at 60 - 70 °C, the rotational speed is 30 - 40 rpm, and the kneading time is 8 - 15 min. By kneading the natural rubber and nitrile rubber in the present invention, the elasticity of the rubber can be reduced, its plasticity and fluidity can be increased, so that it can be uniformly mixed with other raw materials, and the processing performance of the rubber can be improved.

[0022] Furthermore, in step (2), adjust the temperature of the Rubber Compound 1 system to 95 - 105 °C, add the abrasive that has been pre-activated with a silane coupling agent and a foaming agent and an antioxidant, and then carry out mixing. The mixing time is 5 - 10 min to obtain Rubber Compound 2.

[0023] Furthermore, in step (2), the abrasive is at least one of emery and silicon carbide. The method for activating the abrasive with a silane coupling agent includes the following steps: Mix the abrasive and the silane coupling agent evenly in proportion. The mixing temperature is 95 - 105 °C, the rotational speed is 1000 - 1500 rpm, and the mixing time is 10 - 20 min. By activating the abrasive by the above method in the present invention, active groups can be formed on the surface of the abrasive, and the compatibility and bonding force between the abrasive and the polymer matrix can be improved.

[0024] Furthermore, in step (3), the second rubber material is placed in a mold, the mold temperature is controlled to 140-150°C, the pressure is controlled to 5-10MPa, and the first molding is performed for a molding time of 3-10min; then the mold temperature is controlled to 165-175°C, the pressure is controlled to 10-15MPa, and the second molding is performed for a holding time of 10-20min. The first molding uses a lower temperature and pressure to perform preliminary molding and exhaust of the rubber material, so that the rubber material is initially formed and the premature and large-scale decomposition of the foaming agent is avoided; the second molding further increases the temperature and pressure, and the vulcanizing agent can promote the full cross-linking of the rubber molecules to form a stable three-dimensional network structure, thereby improving the strength and heat resistance of the material; the foaming agent is fully decomposed to form a uniform pore structure, so that the polishing part material has good flexibility and cushioning performance.

[0025] Furthermore, in step (3), the molded rubber material is cooled to 50-60° C. and then demolded. Cooling the molded rubber material and then demolding it helps to improve the dimensional stability of the product.

[0026] Furthermore, in step (4), the rubber material 3 is placed in an oven for heat treatment at a temperature of 80-90° C. for a treatment time of 20-28 h.

[0027] The preparation method of the water-abrasive rubber and plastic environmentally friendly polishing material of the present invention designs the process steps and controls the process parameters of each step, so that the raw materials are well matched and synergistic, so that the prepared water-abrasive rubber and plastic polishing material has good wear resistance, high temperature resistance and corrosion resistance, and has good mechanical properties and dimensional stability.

[0028] The beneficial effects of the present invention are as follows: the present invention forms a polymer matrix by compounding a rubber system formed by combining EVA, polyethylene with EPDM, natural rubber and nitrile rubber, and combining additives such as antioxidants, foaming agents, and silane coupling agents, thereby providing support and protection for the abrasive; the abrasive has high hardness and wear resistance, is evenly dispersed in the polymer matrix, and can withstand greater pressure and friction during the polishing process, playing a role in grinding and polishing; the polymer matrix is ​​firmly combined with the polymer matrix, and the water-polished rubber-plastic polishing material obtained has good mechanical properties, wear resistance, high temperature resistance and corrosion resistance, and the polishing material has a cellular structure, can store and release polishing liquid, and effectively improves polishing efficiency and polishing quality. The preparation method of the polishing material has stable process, convenient operation and control, high production efficiency, and is conducive to industrial production. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0030] In some embodiments of the present invention, a water-polished rubber and plastic polishing material includes the following raw materials in parts by weight: 15-25 parts of EVA, 12-20 parts of EPDM, 14-20 parts of polyethylene, 10-18 parts of natural rubber, 4-10 parts of nitrile rubber, 30-45 parts of abrasive, 3-6 parts of compatibilizer, 2-4 parts of antioxidant, 2-6 parts of foaming agent, 2-6 parts of silane coupling agent, and 0.2-0.5 parts of vulcanizer.

[0031] In some embodiments of the present invention, the polyethylene is low-density polyethylene, and the low-density polyethylene is PE 2426H low-density polyethylene (LDPE) produced by BASF-Yangzi. The EVA is ExxonMobil EVA Ultra LD 727.22.

[0032] In some embodiments of the present invention, the antioxidant is at least one of a hindered phenol antioxidant and a phosphite antioxidant.

[0033] In some embodiments of the present invention, the antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1-2:1.

[0034] In some embodiments of the present invention, the foaming agent is at least one of azodicarbonamide, 4,4'-oxybisbenzenesulfonylhydrazide, p-toluenesulfonylhydrazide and sodium bicarbonate.

[0035] In some embodiments of the present invention, the foaming agent is composed of 4,4'-oxybisbenzenesulfonyl hydrazide and sodium bicarbonate in a weight ratio of 2-4:1-2.

[0036] In some embodiments of the present invention, the vulcanizing agent is at least one of dicumyl peroxide, di-tert-butyl peroxide, bis-(tert-butylperoxyisopropyl)benzene and triallyl isocyanurate.

[0037] In some embodiments of the present invention, the silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane and vinyltrimethoxysilane.

[0038] In some embodiments of the present invention, the compatibilizer is at least one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene and styrene-ethylene-butylene-styrene block copolymer.

[0039] In some embodiments of the present invention, the abrasive is at least one of corundum and silicon carbide, and the particle size of the abrasive is 20-40 μm.

[0040] In some embodiments of the present invention, a method for preparing the above-mentioned environmentally friendly polishing material for abrasive rubber and plastic includes the following steps:

[0041] (1) Add EVA, EPDM, polyethylene, and compatibilizer into a kneader for kneading, then add the kneaded natural rubber and nitrile rubber blend and vulcanizing agent for kneading to obtain Compound One.

[0042] (2) Add the abrasive pre-activated by a silane coupling agent into Compound One, and add a foaming agent and an antioxidant, then conduct kneading to obtain Compound Two.

[0043] (3) Place Compound Two in a mold for compression molding, then conduct cooling and demolding to obtain Compound Three.

[0044] (4) Place Compound Three in an oven for heat treatment, then conduct surface finishing to make its dimensions and surface quality meet the requirements, obtaining the polished part material.

[0045] In some embodiments of the present invention, in step (1), add EVA, EPDM, polyethylene, and compatibilizer into a kneader for kneading, the kneading temperature is 115 - 125 °C, the rotation speed is 40 rpm, the kneading time is 2 - 6 min, then add the kneaded natural rubber and nitrile rubber blend and vulcanizing agent for kneading, the kneading temperature is 115 - 125 °C, the kneading time is 5 - 10 min, to obtain Compound One.

[0046] In some embodiments of the present invention, in step (1), the kneading method of the natural rubber and nitrile rubber blend includes the following steps: Place the natural rubber and nitrile rubber in an open mill for kneading, control the roll gap to be 0.5 - 1 mm, control the roll temperature to be 60 - 70 °C, and the kneading time is 8 - 15 min.

[0047] In some embodiments of the present invention, in step (2), adjust the temperature of the Compound One system to 95 - 105 °C, add the abrasive pre-activated by a silane coupling agent and add a foaming agent and an antioxidant, then conduct kneading, the kneading time is 5 - 10 min, to obtain Compound Two.

[0048] In some embodiments of the present invention, in step (2), the abrasive is at least one of emery and silicon carbide. The method for activating the abrasive with a silane coupling agent includes the following steps: Mix the abrasive and the silane coupling agent evenly in proportion, the mixing temperature is 95 - 105 °C, the rotation speed is 1000 - 1500 rpm, and the mixing time is 10 - 20 min.

[0049] In some embodiments of the present invention, in step (3), the second rubber material is placed in a mold, the mold temperature is controlled to 140-150°C, the pressure is controlled to 5-10MPa, and the first molding is performed for a molding time of 3-10min; then the mold temperature is controlled to 165-175°C, the pressure is controlled to 10-15MPa, and the second molding is performed for a holding time of 10-20min.

[0050] Furthermore, in step (3), the molded rubber material is cooled to 50-60° C. and then demolded.

[0051] Furthermore, in step (4), the rubber material 3 is placed in an oven for heat treatment at a temperature of 80-90° C. for a treatment time of 20-28 h.

[0052] Example 1

[0053] The present embodiment provides a water-polished rubber and plastic polishing material, comprising the following raw materials in parts by weight: 20 parts of EVA, 14 parts of EPDM, 16 parts of polyethylene, 12 parts of natural rubber, 6 parts of nitrile rubber, 35 parts of abrasive, 4 parts of compatibilizer, 3 parts of antioxidant, 4 parts of foaming agent, 4 parts of silane coupling agent, and 0.45 parts of vulcanizer.

[0054] In this embodiment, the EVA is ExxonMobil EVA Ultra LD 727.22. The Jilin Petrochemical uses Jilin Petrochemical EPDM 4045. The polyethylene is PE 2426H low-density polyethylene from BASF-Yangzi. The natural rubber is Vietnamese 3L rubber with an impurity content of <0.05%. The nitrile rubber is Jilin Petrochemical nitrile rubber 3305. The compatibilizer is Dow maleic anhydride grafted polyethylene TY 1355.

[0055] Furthermore, the antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1.5:1.

[0056] Furthermore, the foaming agent is composed of 4,4'-oxybisbenzenesulfonyl hydrazide and sodium bicarbonate in a weight ratio of 2:1.

[0057] Furthermore, the vulcanizing agent is composed of diisopropylbenzene peroxide and triallyl isocyanurate in a weight ratio of 4:1. The silane coupling agent is γ-aminopropyltriethoxysilane.

[0058] Furthermore, the abrasive is corundum, and the particle size of the abrasive is 20-40 μm.

[0059] This embodiment also provides a method for preparing the above-mentioned environmentally friendly polishing material for rubber and plastic, comprising the following steps:

[0060] (1) Add EVA, EPDM, polyethylene, and compatibilizer into a kneader for kneading. Then add the pre-kneaded natural rubber and nitrile rubber blend and vulcanizing agent for kneading to obtain Compound One.

[0061] (2) Add the abrasive pre-activated with silane coupling agent into Compound One, and add blowing agent and antioxidant, then conduct kneading to obtain Compound Two.

[0062] (3) Place Compound Two in a mold for compression molding, then cool and demold to obtain Compound Three.

[0063] (4) Place Compound Three in an oven for heat treatment, then conduct surface finishing to make its dimensions and surface quality meet the requirements to obtain the polished part material.

[0064] Further, in step (1), add EVA, EPDM, polyethylene, and compatibilizer into a kneader for kneading. The kneading temperature is 120 °C, the rotation speed is 40 rpm, and the kneading time is 4 min. Then add the pre-kneaded natural rubber and nitrile rubber blend and vulcanizing agent for kneading. The kneading temperature is 120 °C, and the kneading time is 5 - 10 min to obtain Compound One.

[0065] Further, in step (1), the kneading method of the natural rubber and nitrile rubber blend includes the following steps: Place natural rubber and nitrile rubber in an open mill for kneading. Control the roll gap to 0.5 mm, the roll temperature to 65 °C, and the kneading time to 10 min.

[0066] Further, in step (2), adjust the temperature of the Compound One system to 100 °C, add the abrasive pre-activated with silane coupling agent, and add blowing agent and antioxidant, then conduct kneading. The kneading time is 8 min to obtain Compound Two.

[0067] Further, in step (2), the abrasive is at least one of emery and silicon carbide. The method for activating the abrasive with silane coupling agent includes the following steps: Mix the abrasive and silane coupling agent evenly in proportion. The mixing temperature is 100 °C, the rotation speed is 1200 rpm, and the mixing time is 12 min.

[0068] Further, in step (3), place Compound Two in a mold. Control the mold temperature to 145 °C and the pressure to 8 MPa for the first compression molding. The molding time is 5 min; then control the mold temperature to 170 °C and the pressure to 12 MPa for the second compression molding. The pressure holding time is 10 min.

[0069] Further, in step (3), cool the compression-molded compound to 55 °C, and then demold.

[0070] Furthermore, in step (4), the rubber material 3 is placed in an oven for heat treatment at a temperature of 85° C. for a treatment time of 24 h.

[0071] Example 2

[0072] The present embodiment provides a water-polished rubber and plastic polishing material, comprising the following raw materials in parts by weight: 20 parts of EVA, 14 parts of EPDM, 16 parts of polyethylene, 10 parts of natural rubber, 8 parts of nitrile rubber, 35 parts of abrasive, 4 parts of compatibilizer, 3 parts of antioxidant, 4 parts of foaming agent, 4 parts of silane coupling agent, and 0.45 parts of vulcanizer.

[0073] Furthermore, the antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.

[0074] Furthermore, the foaming agent is composed of 4,4'-oxybisbenzenesulfonyl hydrazide and sodium bicarbonate in a weight ratio of 2:1.

[0075] Furthermore, the vulcanizing agent is dicumyl peroxide and triallyl isocyanurate in a weight ratio of 4:1. The silane coupling agent is γ-aminopropyltriethoxysilane.

[0076] Furthermore, the abrasive is corundum, and the particle size of the abrasive is 20-40 μm.

[0077] This embodiment also provides a method for preparing the above-mentioned environmentally friendly polishing material for rubber and plastic, comprising the following steps:

[0078] (1) adding EVA, EPDM, polyethylene and a compatibilizer into an internal mixer for mixing, and then adding a plasticized natural rubber and a nitrile rubber mixed rubber and a vulcanizing agent for mixing to obtain a rubber compound 1;

[0079] (2) adding abrasive pre-activated with a silane coupling agent, a foaming agent, and an antioxidant to the first rubber compound, and then mixing the mixture to obtain the second rubber compound;

[0080] (3) placing the rubber compound 2 in a mold for compression molding, and then cooling and demolding to obtain the rubber compound 3;

[0081] (4) placing the rubber compound in an oven for heat treatment, and then performing surface finishing to make its size and surface quality meet the requirements, thereby obtaining a polished part material.

[0082] Furthermore, in step (1), EVA, EPDM, polyethylene and a compatibilizer are added to an internal mixer for mixing at a mixing temperature of 120°C, a rotation speed of 40 rpm and a mixing time of 4 min, and then the plasticized natural rubber and nitrile rubber mixed rubber and a vulcanizing agent are added for mixing at a mixing temperature of 120°C and a mixing time of 5-10 min to obtain a rubber compound 1.

[0083] Furthermore, in step (1), the method for plasticating the natural rubber and nitrile rubber mixture comprises the following steps: placing the natural rubber and nitrile rubber in an open mill for plasticating, with the roller distance controlled to be 0.5 mm, the roller temperature controlled to be 65° C., and the plasticating time being 10 min.

[0084] Furthermore, in step (2), the temperature of the rubber compound 1 system is adjusted to 100° C., an abrasive previously activated with a silane coupling agent is added, and a foaming agent and an antioxidant are added, followed by mixing. The mixing time is 8 minutes to obtain rubber compound 2.

[0085] Furthermore, in step (2), the abrasive is at least one of corundum and silicon carbide, and the method of activating the abrasive using a silane coupling agent comprises the following steps: mixing the abrasive and the silane coupling agent uniformly in proportion, with a mixing temperature of 100° C., a rotation speed of 1200 rpm, and a mixing time of 12 min.

[0086] Furthermore, in step (3), the second rubber compound is placed in a mold, the mold temperature is controlled to 145°C, the pressure is controlled to 8 MPa, and the first molding is performed for 5 minutes; then the mold temperature is controlled to 170°C, the pressure is controlled to 12 MPa, and the second molding is performed for 10 minutes.

[0087] Furthermore, in step (3), the molded rubber material is cooled to 55° C. and then demolded.

[0088] Furthermore, in step (4), the rubber material 3 is placed in an oven for heat treatment at a temperature of 85° C. for a treatment time of 24 h.

[0089] The rest of the content of this embodiment is the same as that of Embodiment 1 and will not be repeated here.

[0090] Example 3

[0091] The present embodiment provides a water-polished rubber and plastic polishing material, comprising the following raw materials in parts by weight: 18 parts of EVA, 16 parts of EPDM, 15 parts of polyethylene, 12 parts of natural rubber, 6 parts of nitrile rubber, 35 parts of abrasive, 5 parts of compatibilizer, 3 parts of antioxidant, 4 parts of foaming agent, 4 parts of silane coupling agent, and 0.45 parts of vulcanizer.

[0092] Further, the antioxidant consists of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.

[0093] Further, the foaming agent consists of 4,4'-oxybis(benzenesulfonylhydrazide) and sodium bicarbonate in a weight ratio of 2:1.

[0094] Further, the vulcanizing agent consists of dicumyl peroxide and triallyl isocyanurate in a weight ratio of 4:1. The silane coupling agent consists of γ-methacryloxypropyltrimethoxysilane and vinyltrimethoxysilane in a weight ratio of 1:1.

[0095] Further, the abrasive is emery, and the particle size of the abrasive is 20 - 40 μm.

[0096] This embodiment also provides a preparation method of the above-mentioned environmentally friendly polishing part material for grinding rubber and plastic, including the following steps:

[0097] (1) Add EVA, EPDM, polyethylene and compatibilizer into a mixer for kneading, then add the pre-kneaded mixed rubber of natural rubber and nitrile rubber and the vulcanizing agent for kneading to obtain Compound One.

[0098] (2) Add the abrasive pre-activated by the silane coupling agent, the foaming agent and the antioxidant into Compound One, and then conduct kneading to obtain Compound Two.

[0099] (3) Place Compound Two in a mold for molding by compression, and then conduct cooling and demolding to obtain Compound Three.

[0100] (4) Place Compound Three in an oven for heat treatment, and then conduct surface finishing to make its size and surface quality meet the requirements to obtain the polishing part material.

[0101] Further, in step (1), add EVA, EPDM, polyethylene and compatibilizer into a mixer for kneading. The kneading temperature is 120°C, the rotation speed is 40 rpm, and the kneading time is 4 min. Then add the pre-kneaded mixed rubber of natural rubber and nitrile rubber and the vulcanizing agent for kneading. The kneading temperature is 120°C, and the kneading time is 5 - 10 min to obtain Compound One.

[0102] Further, in step (1), the kneading method of the mixed rubber of natural rubber and nitrile rubber includes the following steps: Place natural rubber and nitrile rubber in an open mill for kneading. The roll gap is controlled at 0.5 mm, the roll temperature is controlled at 65°C, and the kneading time is 10 min.

[0103] Furthermore, in step (2), the temperature of the rubber compound 1 system is adjusted to 100° C., an abrasive previously activated with a silane coupling agent is added, and a foaming agent and an antioxidant are added, followed by mixing. The mixing time is 8 minutes to obtain rubber compound 2.

[0104] Furthermore, in step (2), the abrasive is at least one of corundum and silicon carbide, and the method of activating the abrasive using a silane coupling agent comprises the following steps: mixing the abrasive and the silane coupling agent uniformly in proportion, with a mixing temperature of 100° C., a rotation speed of 1200 rpm, and a mixing time of 12 min.

[0105] Furthermore, in step (3), the second rubber material is placed in a mold, the mold temperature is controlled to 140°C, the pressure is controlled to 8 MPa, and the first molding is performed for 6 minutes; then the mold temperature is controlled to 170°C, the pressure is controlled to 12 MPa, and the second molding is performed for 10 minutes.

[0106] Furthermore, in step (3), the molded rubber material is cooled to 55° C. and then demolded.

[0107] Furthermore, in step (4), the rubber material 3 is placed in an oven for heat treatment at a temperature of 85° C. for a treatment time of 24 h.

[0108] The rest of the content of this embodiment is the same as that of Embodiment 1 and will not be repeated here.

[0109] Comparative Example 1

[0110] The difference between this comparative example and Example 1 is that natural rubber is not added to the water-ground rubber-plastic polishing material of this comparative example, and an equal amount of EPDM is used instead.

[0111] Comparative Example 2

[0112] The difference between this comparative example and Example 1 is that no nitrile rubber is added to the water-ground rubber-plastic polishing material of this comparative example, and an equal amount of EPDM is used instead.

[0113] Comparative Example 3

[0114] The difference between this comparative example and Example 1 is that polyethylene is not added to the water-ground rubber-plastic polishing material of this comparative example, and an equal amount of EVA is used instead.

[0115] The water-abrasive rubber-plastic polishing material obtained in Examples 1-3 and Comparative Examples 1-3 was trimmed into a disc-shaped polishing pad, the polishing pad having a thickness of 3 mm and a diameter of 150 mm, and the performance was measured. The test results are shown in Table 1 below:

[0116]

[0117] Among them, the tensile strength refers to GB / T 528-2009. The wear resistance test refers to GB / T 9867-2008 to determine the wear amount. The heat deformation temperature refers to GB / T 1634.1-2019. The high temperature resistance is subjected to a heat aging test in accordance with GB / T 3512-2014: the sample is placed in a 150℃ oven for aging for 72h, and after aging, the sample is conditioned in an environment of 23℃ and 55% RH for 24h to test the tensile strength retention rate. The corrosion resistance refers to GB / T 1690-2010, and the sample is immersed in 10wt% H2SO4 for 24h to determine its corrosion resistance. The compression permanent deformation refers to GB / T7759.1-2015, and the test temperature is 23℃ and the humidity is 55% RH. The porosity of the polishing pads of Examples 1-3 is 50-60%, and the average pore size is 40-70 μm. The pore structure can be used to store polishing liquid, which is released through pressure changes to reduce direct dry friction between the abrasive and the workpiece, thereby helping to improve polishing efficiency.

[0118] In summary, the present invention forms a polymer matrix by compounding a rubber system formed by combining EVA, polyethylene with EPDM, natural rubber and nitrile rubber, and combining additives such as antioxidants, foaming agents, and silane coupling agents. The polymer matrix and the abrasive are well combined, so that the prepared water-abrasive rubber and plastic polishing material has good mechanical properties, wear resistance, high temperature resistance and corrosion resistance, and has low compression permanent deformation.

[0119] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A water-polished rubber and plastic polishing part material, characterized in that: It comprises the following raw materials in parts by weight: 15 - 25 parts of EVA, 12 - 20 parts of EPDM, 14 - 20 parts of polyethylene, 10 - 18 parts of natural rubber, 4 - 10 parts of nitrile rubber, 30 - 45 parts of abrasive, 3 - 6 parts of compatibilizer, 2 - 4 parts of antioxidant, 2 - 6 parts of foaming agent, 2 - 6 parts of silane coupling agent, and 0.2 - 0.5 part of vulcanizing agent.

2. The water mill rubber and plastic polishing part material according to claim 1, characterized in that: The antioxidant is at least one of hindered phenolic antioxidants and phosphite antioxidants.

3. The water-polished rubber and plastic polishing material according to claim 1, characterized in that: The foaming agent is at least one of azodicarbonamide, 4,4'-oxybis(benzenesulfonyl hydrazide), p-toluenesulfonyl hydrazide, and sodium bicarbonate.

4. The water mill rubber and plastic polishing part material according to claim 1, characterized in that: The vulcanizing agent is at least one of dicumyl peroxide, di-tert-butyl peroxide, bis-(tert-butylperoxyisopropyl)benzene, and triallyl isocyanurate.

5. The water mill rubber and plastic polishing part material according to claim 1, characterized in that: The silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, and vinyltrimethoxysilane.

6. The water-polished rubber and plastic polishing material according to claim 1, characterized in that: The abrasive is at least one of emery and silicon carbide, and the particle size of the abrasive is 20 - 40 μm.

7. A preparation method of the water mill rubber and plastic polishing part material according to any one of claims 1-6, characterized in that: It comprises the following steps: (1) Add EVA, EPDM, polyethylene, and compatibilizer into a mixer for kneading, then add the mixed rubber of pre-kneaded natural rubber and nitrile rubber and the vulcanizing agent for kneading to obtain Compound One. (2) Add the abrasive pre-activated by a silane coupling agent, the foaming agent, and the antioxidant into Compound One, and then conduct kneading to obtain Compound Two. (3) Place Compound Two in a mold for compression molding, and then cool and demold to obtain Compound Three. (4) Place Compound Three in an oven for heat treatment, and then conduct surface finishing to obtain the polished part material.

8. The preparation method of the water mill rubber and plastic polishing part material according to claim 7, characterized in that: In step (1), add EVA, LDPE, and EPDM into a mixer for kneading. The kneading temperature is 115 - 125°C, and the kneading time is 2 - 6 min. Then add the mixed rubber of pre-kneaded natural rubber and nitrile rubber and the vulcanizing agent for kneading. The kneading temperature is 115 - 125°C, and the kneading time is 5 - 10 min to obtain Compound One.

9. The method for preparing water-polished rubber and plastic polishing material according to claim 7, characterized in that: In step (2), adjust the temperature of the Compound One system to 95 - 105°C, add the abrasive pre-activated by a silane coupling agent, the foaming agent, and the antioxidant, and then conduct kneading. The kneading time is 5 - 10 min to obtain Compound Two.

10. The preparation method of the water mill rubber and plastic polishing part material according to claim 7, characterized in that: In step (3), place Compound Two in a mold. The mold temperature is controlled at 140 - 150°C, and the pressure is controlled at 5 - 10 MPa for the first compression molding. The compression molding time is 3 - 10 min. Then control the mold temperature at 165 - 175°C, and the pressure at 10 - 15 MPa for the second compression molding. The pressure holding time is 10 - 20 min.

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