Elastic grinding block and method for producing same

Abstract

The present application relates to the technical field of elastic grinding block, and particularly relates to an elastic grinding block and a preparation method thereof.The elastic grinding block comprises epoxy resin, curing agent, powder resin binder, diamond abrasive, auxiliary abrasive, filler, toughening agent, coupling agent, defoaming agent, rheological agent and diluent.Compared with a traditional room temperature curing process, the present application adopts a simple hot pressing process, and in the hot pressing process, multi-stage exhaust is not needed, the process is simple, the product quality is stable, the forming speed is fast, the curing time is short, and after a large amount of fillers and abrasives are added into the epoxy resin, the dispersibility of the fillers and abrasives is not affected, the surface hardness of the product after curing can reach more than 80HD, the fillers and abrasives are uniformly distributed, and the grinding effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elastic grinding block, in particular to an elastic grinding block and a preparation method thereof. BACKGROUND

[0002] The elastic grinding block is mainly used for grinding and polishing the surface of ceramic tile. After the ceramic tile is fired, the surface of the ceramic tile needs to be ground and polished using a resin elastic grinding block. The resin elastic grinding block has good elasticity and good self-sharpening property due to the base body. In combination with coarse-grained diamond, the grinding block has high sharpness, and can complete the grinding of the surface of the ceramic tile. In combination with fine-grained diamond, the grinding block can complete the finishing of the surface of the ceramic tile, so that the ceramic tile has gloss. With the improvement of living standards, the types of ceramic tiles are more and more diversified, and people's requirements for the universality and quality of the elastic grinding block are also higher and higher. At present, there are resin elastic grinding blocks for ceramic tile grinding and polishing processing, but there are the following problems:

[0003] 1. The elastic grinding blocks used in the domestic market at present are basically hot-pressed using powder phenolic or melamine resin. The hardness of the grinding block is high, and the brittleness is large. Therefore, when grinding some ceramic tiles with low surface hardness, scratches are easily generated.

[0004] 2. The hot-pressing process of the elastic grinding block used at present is mostly a process of hot-pressing and exhausting by a hydraulic press. The process is complex, and the setting of a large number of exhausting sections easily leads to unstable product quality.

[0005] 3. The bonding force of the powder phenolic resin and the melamine resin to the diamond is low, which leads to the easy falling off of the diamond during grinding, and the actual utilization rate is not high.

[0006] 4. The liquid epoxy resin grinding block is soft itself, and in the actual use process, the particles are easily damaged when facing complex working conditions, which affects the grinding effect. SUMMARY

[0007] Other features and advantages of the present application will be set forth in the following specification, and in part will become apparent to those skilled in the art upon examination of the specification or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the specification.

[0008] The present application aims at overcoming the above-mentioned defects, and provides an elastic grinding block and a preparation method thereof. The present application is based on diamond abrasive, auxiliary abrasive and filler, adopts liquid epoxy resin and powder resin as a binder, and adopts high-strength and high-temperature resistant curing agent. Under the mutual cooperation and synergistic effect of toughening agent, coupling agent, defoaming agent, rheological agent and diluent, the elastic grinding block has the advantages of uniform abrasive distribution, high wear resistance, stable performance, strong universality, good gloss, product appearance and the like. In addition, the present application adopts a simple hot pressing process. In the hot pressing process, multi-stage exhaust is not required, the process is simple, the product quality is stable, the forming speed is fast, the curing time is short, and after a large amount of filler and abrasive are added in the epoxy resin, the dispersibility of the filler and the abrasive is not affected. The surface hardness of the product after curing can reach more than 80HD, the abrasive and the filler are uniformly distributed, and the grinding effect is good.

[0009] To achieve the above-mentioned purpose, the technical solution of the present application is to provide an elastic grinding block. The elastic grinding block comprises epoxy resin, curing agent, powder resin binder, diamond abrasive, auxiliary abrasive, filler, toughening agent, coupling agent, defoaming agent, rheological agent and diluent.

[0010] Based on the total mass of the elastic grinding block, the mass content of the epoxy resin is 20% to 30%, the mass content of the curing agent is 10% to 30%, the mass content of the powder resin binder is 5% to 10%, the mass content of the diamond abrasive is 5% to 10%, the mass content of the auxiliary abrasive is 10% to 15%, the mass content of the filler is 15% to 20%, the mass content of the toughening agent is 3% to 6%, the mass content of the coupling agent is 0.5% to 1%, the mass content of the defoaming agent is 0.2% to 0.5%, the mass content of the rheological agent is 0.3% to 0.5%, and the mass content of the diluent is 1% to 2%.

[0011] The present application uses the method of combining liquid epoxy resin binder with part of powder resin binder, improves the wear resistance and impact resistance of the product, and selects high-strength and high-temperature resistant curing agent to increase the wear resistance and grinding stability of the product.

[0012] In some embodiments, the epoxy resin is a bisphenol A type epoxy resin with an epoxy value of 0.48-0.54. The epoxy resin refers to a high molecular compound containing an epoxy group. Among them, the bisphenol A epoxy resin is the most widely used due to its easy availability of raw materials and good economy. The bisphenol A type epoxy resin has good strength and excellent chemical stability, and no reaction gas is released during curing, which greatly reduces the shrinkage rate of the elastic grinding block. Since the epoxy resin with an epoxy value of 0.48-0.54 has moderate viscosity and can adapt to a variety of curing agents, the present application selects such epoxy resin, so that the elastic grinding block can have good adjustment performance during processing, which is helpful for processing.

[0013] In some embodiments, the powder resin binder is a powder phenolic resin or a powder melamine resin.

[0014] In some embodiments, the curing agent is one or a combination of more than two of alicyclic amine curing agent, acid anhydride curing agent, and imidazole curing agent. Since the epoxy resin itself is a linear thermoplastic resin and cannot be cured, a curing agent needs to be added to form a network and body structure. The present application selects a curing agent with good temperature resistance and mechanical properties to ensure that the elastic grinding block will not significantly reduce the mechanical properties of the tire body due to heating during grinding, thereby reducing the holding force on the diamond.

[0015] In some embodiments, the auxiliary abrasive is silicon carbide or white corundum. Silicon carbide is irregular in shape, has high hardness and is brittle, has fast cutting edge and good thermal conductivity, and can improve sharpness and heat dissipation; white corundum is a regular spherical particle, which has good impact resistance and can increase the wear resistance of the mold.

[0016] In some embodiments, the filler is one or a combination of more than two of alumina, montmorillonite, calcium carbonate, calcium sulfate whiskers, and cerium oxide.

[0017] In some embodiments, the toughening agent is one or a combination of more than two of liquid nitrile rubber, polyvinyl butyral, and silicone rubber. The toughening agent can effectively reduce the internal stress during resin curing shrinkage by introducing a flexible chain network into the rigid structure of the epoxy resin, thereby improving the impact resistance and wear resistance of the product.

[0018] In some embodiments, the coupling agent is a titanate coupling agent or a silane coupling agent. As an intermediate, the coupling agent combines with the abrasive and the filler through the inorganic group on one end and the resin through the organic group on the other end, which can improve the bonding force between the resin binder and the abrasive and the filler, and increase the mechanical properties of the product and the utilization rate of the abrasive.

[0019] In some embodiments, the defoaming agent is a polyether defoaming agent or a silicone defoaming agent. The defoaming agent can remove the air bubbles inside and outside the abrasive particles, increase the appearance and wear resistance of the product.

[0020] In some embodiments, the rheological agent is fumed silica, organic bentonite or polyethylene wax. The rheological agent can improve the stability of the slurry and prevent the settlement and stratification of the filler and the abrasive.

[0021] In some embodiments, the diluent is a non-active diluent or / and an active diluent. The diluent can improve the flowability of the slurry on one hand, and facilitate pouring on the other hand. On the premise of ensuring the performance of the product, the diluent can effectively reduce the viscosity of the slurry, improve the adjustability of the formula, and reduce the operation difficulty during pouring.

[0022] The application also provides a preparation method of the elastic abrasive block. The preparation method comprises the following steps:

[0023] Batching, uniformly mixing the diamond abrasive, auxiliary abrasive, filler and powder resin binder by mechanical stirring, and then adding the epoxy resin, curing agent, toughening agent, coupling agent, defoaming agent, rheological agent and diluent for continuous stirring to obtain a slurry with a viscosity of 15 Pa·s to 20 Pa·s;

[0024] Hot pressing, pouring the slurry into a preheated mold by pouring, scraping and hot pressing to obtain an elastic abrasive block blank;

[0025] Secondary curing, placing the elastic abrasive block blank in an oven for secondary curing to obtain an elastic abrasive block product.

[0026] Compared with the traditional room temperature curing process, the application adopts a simple hot pressing process. In the hot pressing process, multi-stage exhaust is not required, the process is simple, the product quality is stable, the forming speed is fast, the curing time is short, and after a large amount of filler and abrasive are added to the epoxy resin, the dispersibility of the filler and the abrasive is not affected. The surface hardness of the cured product can reach more than 80HD, the abrasive and the filler are uniformly distributed, and the grinding effect is good.

[0027] In some embodiments, in the hot pressing step, the temperature of the upper plate for hot pressing is 145℃ to 155℃, the temperature of the lower plate for hot pressing is 155℃ to 165℃, the pressure for hot pressing is 8MPa to 12MPa, and the time for hot pressing is 13min to 17min. In the hot pressing process of the application, only pressure is required, and no exhaust process is required. While ensuring that the product is dense, beautiful and stable in performance, the complexity of the process is reduced.

[0028] In some embodiments, in the secondary curing step, the temperature for secondary curing is 75℃ to 85℃, and the time for secondary curing is 6h to 8h.

[0029] In some embodiments, in the hot pressing step, the temperature of the mold can reach above 140 DEG C, at which the adhesion of the epoxy resin to the mold is reduced, and the problem of difficult demolding of the cast product can be solved.

[0030] By adopting the technical scheme, the application has the beneficial effects that:

[0031] The application is based on diamond abrasive, auxiliary abrasive and filler, uses liquid epoxy resin and powder resin (phenolic resin or melamine resin) as a binder, and uses a high-strength high-temperature curing agent, and under the mutual cooperation and synergistic effect of a toughening agent, a coupling agent, a defoaming agent, a rheological agent and a diluent, the elastic abrasive block has the advantages of uniform abrasive distribution, high wear resistance, stable performance, strong versatility, good gloss, product aesthetics and the like.

[0032] The application adopts a simple hot pressing process, and in the hot pressing process, multi-stage exhaust is not required, the process is simple, the product quality is stable, the forming speed is fast, the curing time is short, and after a large amount of filler and abrasive are added to the epoxy resin, the dispersibility of the filler and the abrasive is not affected, the surface hardness of the product after curing can reach above 80HD, the abrasive and the filler are uniformly distributed, and the grinding effect is good.

[0033] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application.

[0034] It is self-evident that the above-mentioned and other purposes of the application and other purposes will become more apparent after the description of the preferred embodiments of the application described in the following various drawings and diagrams.

[0035] In order to make the above and other purposes, features and advantages of the application more apparent and easy to understand, one or more preferred embodiments are described in detail below, and the drawings are shown, and are specifically described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0036] The drawings are used to provide a further understanding of the application, and constitute a part of the specification, and are used together with the embodiments of the application to explain the application, and do not constitute a limitation on the application.

[0037] In the drawings, the same parts use the same reference numerals, and the drawings are schematic and are not necessarily drawn according to the actual scale.

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent one or some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0039] Figure 1 A flow chart for preparing an elastic grinding block. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application in detail with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

[0041] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through a transition structure, but is connected only through a connection structure to form a whole. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0044] According to some embodiments of the present application, the present application provides an elastic grinding block. The elastic grinding block comprises an epoxy resin, a curing agent, a powder resin binder, a diamond abrasive, an auxiliary abrasive, a filler, a toughening agent, a coupling agent, an antifoaming agent, a rheological agent, and a diluent.

[0045] The mass content of the epoxy resin is 20% to 30%, the mass content of the curing agent is 10% to 30%, the mass content of the powder resin binder is 5% to 10%, the mass content of the diamond abrasive is 5% to 10%, the mass content of the auxiliary abrasive is 10% to 15%, the mass content of the filler is 15% to 20%, the mass content of the toughening agent is 3% to 6%, the mass content of the coupling agent is 0.5% to 1%, the mass content of the antifoaming agent is 0.2% to 0.5%, the mass content of the rheological agent is 0.3% to 0.5%, and the mass content of the diluent is 1% to 2%, based on the total mass of the elastic grinding block.

[0046] The method of using a liquid epoxy resin binder in cooperation with a partial powder resin binder used in the present application improves the wear resistance and impact resistance of the product, and the use of a high-strength and high-temperature-resistant curing agent increases the wear resistance and grinding stability of the product.

[0047] Alternatively, the mass content of the epoxy resin is 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or a value within a range obtained by combining any two of the above values.

[0048] Alternatively, the mass content of the curing agent is 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or a value within a range obtained by combining any two of the above values.

[0049] Optionally, the mass content of the powder resin binder is 5%, 6%, 7%, 8%, 9%, 10%, or a range obtained by combining any two of the aforementioned values.

[0050] Optionally, the mass content of the diamond abrasive is 5%, 6%, 7%, 8%, 9%, 10%, or a range obtained by combining any two of the aforementioned values.

[0051] Optionally, the mass content of the auxiliary abrasive is 10%, 11%, 12%, 13%, 14%, 15%, or a range obtained by combining any two of the aforementioned values.

[0052] Optionally, the mass content of the filler is 15%, 16%, 17%, 18%, 19%, 20%, or a range obtained by combining any two of the aforementioned values.

[0053] Optionally, the mass content of the toughening agent is 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, or a range obtained by combining any two of the aforementioned values.

[0054] Optionally, the mass content of the coupling agent is 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or a range obtained by combining any two of the aforementioned values.

[0055] Optionally, the mass content of the defoaming agent is 0.2%, 0.3%, 0.4%, 0.5%, or a range obtained by combining any two of the aforementioned values.

[0056] Optionally, the mass content of the rheological agent is 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, or a range obtained by combining any two of the aforementioned values.

[0057] Optionally, the mass content of the diluent is 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or a range obtained by combining any two of the aforementioned values.

[0058] According to some embodiments of the present application, optionally, the epoxy resin is a bisphenol A type epoxy resin with an epoxy value of 0.48-0.54. The epoxy resin refers to a high molecular compound containing an epoxy group. Among them, the bisphenol A epoxy resin is the most widely used due to its easy availability of raw materials and good economy. The bisphenol A type epoxy resin has good strength and excellent chemical stability, and no reaction gas is released during curing, which greatly reduces the shrinkage rate of the elastic grinding block. Since the epoxy resin with an epoxy value of 0.48-0.54 has moderate viscosity and can adapt to a variety of curing agents, the present application selects such epoxy resin, so that the elastic grinding block can have good adjustment performance during processing, which is helpful for processing.

[0059] Optionally, the epoxy value of the epoxy resin is 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, or a value within the range obtained by combining any two of the above values.

[0060] According to some embodiments of the present application, optionally, the powder resin binder is a powder phenolic resin or a powder melamine resin.

[0061] According to some embodiments of the present application, optionally, the curing agent is one or a combination of two or more of alicyclic amine curing agent, acid anhydride curing agent, and imidazole curing agent. Since the epoxy resin itself is a linear thermoplastic resin and cannot be cured, a curing agent needs to be added to form a network and a body structure. The present application selects a curing agent with good temperature resistance and mechanical properties to ensure that the elastic grinding block will not significantly reduce the mechanical properties of the tire body due to heating during grinding, thereby reducing the holding force on the diamond.

[0062] According to some embodiments of the present application, optionally, the auxiliary abrasive is silicon carbide or white corundum. Silicon carbide is irregular in shape, has high hardness and brittleness, has fast cutting edge and good thermal conductivity, and can improve sharpness and heat dissipation; white corundum is a regular spherical particle, which has good impact resistance and can increase the wear resistance of the mold.

[0063] According to some embodiments of the present application, optionally, the filler is one or a combination of two or more of alumina, montmorillonite, calcium carbonate, calcium sulfate whisker, and cerium oxide.

[0064] According to some embodiments of the present application, optionally, the toughening agent is one or a combination of two or more of liquid nitrile rubber, polyvinyl butyral, and silicone rubber. The toughening agent can effectively reduce the internal stress of the resin during curing shrinkage by introducing a flexible chain network into the rigid structure of the epoxy resin, thereby improving the impact resistance and wear resistance of the product.

[0065] According to some embodiments of the present application, the coupling agent is optionally a titanate coupling agent or a silane coupling agent. As an intermediate, the coupling agent has one end of inorganic group combined with the abrasive and filler and the other end of organic group combined with the resin, which can improve the binding force between the resin binder and the abrasive and filler, increase the mechanical properties of the product and the utilization rate of the abrasive.

[0066] According to some embodiments of the present application, the defoaming agent is optionally a polyether defoaming agent or a silicone defoaming agent. The defoaming agent can remove the air bubbles inside and outside the abrasive particles, increase the appearance and wear resistance of the product.

[0067] Optionally, the polyether defoaming agent can be, but is not limited to, polypropylene glycol ether, polyglycerol ether, etc.

[0068] Optionally, the silicone defoaming agent can be, but is not limited to, dimethyl silicone oil, ethylene glycol siloxane, etc.

[0069] According to some embodiments of the present application, the rheological agent is optionally fumed silica, organic bentonite or polyethylene wax. The rheological agent can improve the stability of the slurry and prevent the settlement and stratification of the filler and abrasive.

[0070] According to some embodiments of the present application, the diluent is optionally an inactive diluent or / and an active diluent. The diluent can improve the flowability of the slurry on one hand, and facilitate pouring on the other hand. On the premise of ensuring the performance of the product, the diluent can effectively reduce the viscosity of the slurry, improve the adjustability of the formula and reduce the operation difficulty during pouring.

[0071] Optionally, the inactive diluent can be, but is not limited to, o-xylene, dioctyl phthalate, etc.

[0072] Optionally, the active diluent can be, but is not limited to, carbon n-butyl glycidyl ether, phenyl glycidyl ether, etc.

[0073] Reference Figure 1 , Figure 1 A preparation flow chart of the elastic abrasive block according to the present application.

[0074] According to some embodiments of the present application, the present application further provides a preparation method of the elastic abrasive block. The preparation method comprises the following steps:

[0075] Dosing, after uniformly mixing the diamond abrasive, auxiliary abrasive, filler, powder resin binder by mechanical stirring, adding the epoxy resin, curing agent, toughening agent, coupling agent, defoaming agent, rheological agent and diluent and continuously stirring uniformly, a slurry with a viscosity of 15 Pa·s-20 Pa·s is obtained;

[0076] hot pressing, the slurry is injected into a preheated mold by casting, leveled and hot pressed to obtain an elastic grinding block blank;

[0077] secondary curing, the elastic grinding block blank is placed in an oven for secondary curing to obtain an elastic grinding block finished product.

[0078] Compared with the traditional room temperature curing process, the present application adopts a simple hot pressing process, which does not need to perform multi-stage exhaust during hot pressing, and has the advantages of simple process, stable product quality, fast forming speed, short curing time, and the like.

[0079] According to some embodiments of the present application, optionally, in the hot pressing step, the upper plate temperature of hot pressing is 145-155 DEG C, the lower plate temperature of hot pressing is 155-165 DEG C, the pressure of hot pressing is 8-12 MPa, and the time of hot pressing is 13-17 min.

[0080] Optionally, the upper plate temperature of hot pressing is 145 DEG C, 146 DEG C, 147 DEG C, 148 DEG C, 149 DEG C, 150 DEG C, 151 DEG C, 152 DEG C, 153 DEG C, 154 DEG C, 155 DEG C, or a value within the range obtained by combining any two of the above values.

[0081] Optionally, the lower plate temperature of hot pressing is 155 DEG C, 156 DEG C, 157 DEG C, 158 DEG C, 159 DEG C, 160 DEG C, 161 DEG C, 162 DEG C, 163 DEG C, 164 DEG C, 165 DEG C, or a value within the range obtained by combining any two of the above values.

[0082] Optionally, the pressure of hot pressing is 8 MPa, 8.5 MPa, 9 MPa, 9.5 MPa, 10 MPa, 10.5 MPa, 11 MPa, 11.5 MPa, 12 MPa, or a value within the range obtained by combining any two of the above values.

[0083] Optionally, the time of hot pressing is 13 min, 13.5 min, 14 min, 14.5 min, 15 min, 15.5 min, 16 min, 16.5 min, 17 min, or a value within the range obtained by combining any two of the above values.

[0084] According to some embodiments of the present application, optionally, in the secondary curing step, the temperature of secondary curing is 75-85 DEG C, and the time of secondary curing is 6-8 h.

[0085] Optionally, the temperature of the secondary curing is 75℃, 76℃, 77℃, 78℃, 79℃, 80℃, 81℃, 82℃, 83℃, 84℃, 85℃, or a value within a range derived from any two of the above values.

[0086] Optionally, the time of the secondary curing is 6h, 6.2h, 6.4h, 6.6h, 6.8h, 7h, 7.2h, 7.4h, 7.6h, 7.8h, 8h, or a value within a range derived from any two of the above values.

[0087] According to some embodiments of the present application, optionally, in the hot-pressing step, the temperature of the preheated mold is 50℃-70℃. The present application preheats the mold before pouring the slurry, which can solve the problem of difficult demolding of the cast product.

[0088] Optionally, the temperature of the preheated mold is 50℃, 52℃, 54℃, 56℃, 58℃, 60℃, 62℃, 64℃, 66℃, 68℃, 70℃, or a value within a range derived from any two of the above values.

[0089] Example 1

[0090] The present embodiment provides an elastic grinding block. The elastic grinding block comprises an epoxy resin with an epoxy value of 0.48, a cycloaliphatic amine curing agent, a powder phenolic resin, a diamond abrasive, an auxiliary abrasive (silicon carbide and white corundum), a filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whiskers, and cerium oxide), a liquid nitrile rubber, a titanate coupling agent, a polyether defoaming agent, fumed silica, and o-xylene.

[0091] Based on the total mass of the elastic grinding block, the mass content of the epoxy resin with an epoxy value of 0.48 is 30%, the mass content of the cycloaliphatic amine curing agent is 30%, the mass content of the powder phenolic resin is 5%, the mass content of the diamond abrasive is 5%, the mass content of the auxiliary abrasive (silicon carbide and white corundum) is 10%, the mass content of the filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whiskers, and cerium oxide) is 15%, the mass content of the liquid nitrile rubber is 3%, the mass content of the titanate coupling agent is 0.5%, the mass content of the polyether defoaming agent is 0.2%, the mass content of the fumed silica is 0.3%, and the mass content of the o-xylene is 1%.

[0092] The present embodiment also provides a preparation method of an elastic grinding block. The preparation method comprises the following steps:

[0093] The ingredients, diamond abrasive, auxiliary abrasive (silicon carbide and white corundum), filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide), powder phenolic resin, are uniformly stirred by mechanical stirring, then epoxy resin with an epoxy value of 0.48, aliphatic amine curing agent, liquid nitrile rubber, titanate coupling agent, polyether defoaming agent, fumed silica and o-xylene are added and uniformly stirred to obtain a slurry with a viscosity of 15 Pa·s;

[0094] Hot pressing, the slurry is injected into a mold preheated to 50℃ by pouring, leveled and hot pressed (the upper plate temperature of hot pressing is 145℃, the lower plate temperature of hot pressing is 155℃, the pressure of hot pressing is 8 MPa, and the time of hot pressing is 17 min) to obtain an elastic grinding block blank;

[0095] Secondary curing, the elastic grinding block blank is placed in an oven for secondary curing (temperature is 75℃, time is 8h) to obtain an elastic grinding block finished product.

[0096] Example 2

[0097] The embodiment provides an elastic grinding block. The elastic grinding block comprises epoxy resin with an epoxy value of 0.50, anhydride curing agent, powder melamine resin, diamond abrasive, auxiliary abrasive (silicon carbide and white corundum), filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide), polyvinyl butyral, silane coupling agent, silicone defoaming agent, organic bentonite and dioctyl phthalate.

[0098] Based on the total mass of the elastic grinding block, the mass content of the epoxy resin with an epoxy value of 0.50 is 25%, the mass content of the anhydride curing agent is 21.55%, the mass content of the powder melamine resin is 8%, the mass content of the diamond abrasive is 8%, the mass content of the auxiliary abrasive (silicon carbide and white corundum) is 12%, the mass content of the filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide) is 18%, the mass content of the polyvinyl butyral is 4.5%, the mass content of the silane coupling agent is 0.8%, the mass content of the silicone defoaming agent is 0.25%, the mass content of the organic bentonite is 0.4%, and the mass content of the dioctyl phthalate is 1.5%.

[0099] The embodiment also provides a preparation method of an elastic grinding block. The preparation method comprises the following steps:

[0100] The ingredients, diamond abrasive, auxiliary abrasive (silicon carbide and white corundum), filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide), powder melamine resin are uniformly stirred by mechanical stirring, then epoxy resin with an epoxy value of 0.50, acid anhydride curing agent, polyvinyl butyral, silane coupling agent, silicone defoaming agent, organic bentonite, dioctyl phthalate are added and uniformly stirred, to obtain a slurry with a viscosity of 18 Pa·s;

[0101] Hot pressing, the slurry is injected into a mold preheated to 60℃ by pouring, scraped flat and hot pressed (the upper plate temperature of hot pressing is 150℃, the lower plate temperature of hot pressing is 160℃, the pressure of hot pressing is 10 MPa, and the time of hot pressing is 15 min), to obtain an elastic grinding block blank;

[0102] Secondary curing, the elastic grinding block blank is placed in an oven for secondary curing (temperature is 80℃, time is 7h), to obtain an elastic grinding block finished product.

[0103] Example 3

[0104] The embodiment provides an elastic grinding block. The elastic grinding block comprises epoxy resin with an epoxy value of 0.54, imidazole curing agent, powder phenolic resin, diamond abrasive, auxiliary abrasive (silicon carbide and white corundum), filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide), silicone rubber, titanate coupling agent, silicone defoaming agent, polyethylene wax and carbon n-butyl glycidyl ether.

[0105] Based on the total mass of the elastic grinding block, the mass content of the epoxy resin with an epoxy value of 0.54 is 25%, the mass content of the imidazole curing agent is 10%, the mass content of the powder phenolic resin is 10%, the mass content of the diamond abrasive is 10%, the mass content of the auxiliary abrasive (silicon carbide and white corundum) is 15%, the mass content of the filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide) is 20%, the mass content of the silicone rubber is 6%, the mass content of the titanate coupling agent is 1%, the mass content of the silicone defoaming agent is 0.5%, the mass content of the polyethylene wax is 0.5%, and the mass content of the carbon n-butyl glycidyl ether is 2%.

[0106] The embodiment also provides a preparation method of an elastic grinding block. The preparation method comprises the following steps:

[0107] The ingredients, diamond abrasive, auxiliary abrasive (silicon carbide and white corundum), filler (alumina, montmorillonite, calcium carbonate, calcium sulfate whisker and cerium oxide), powder phenolic resin are uniformly mixed by mechanical stirring, then epoxy resin with an epoxy value of 0.54, imidazole curing agent, silicone rubber, titanate coupling agent, silicone defoaming agent, polyethylene wax, carbon n-butyl glycidyl ether are added and uniformly stirred to obtain a slurry with a viscosity of 20 Pa·s;

[0108] Hot pressing, the slurry is injected into a mold preheated to 70 DEG C by pouring, scraped and hot pressed (the upper plate temperature of hot pressing is 155 DEG C, the lower plate temperature of hot pressing is 165 DEG C, the pressure of hot pressing is 12 MPa, and the time of hot pressing is 13 min), to obtain an elastic grinding block blank;

[0109] Secondary curing, the elastic grinding block blank is placed in an oven for secondary curing (temperature is 85 DEG C, time is 6 h), to obtain an elastic grinding block finished product.

[0110] Comparative example

[0111] The comparative example provides an elastic grinding block. The elastic grinding block comprises, by mass percentage, diamond abrasive 10%, silicon carbide powder 10%, W20 white corundum 5%, alumina 15%, zinc oxide 10%, calcium carbonate 10%, and phenolic resin powder 40%.

[0112] The preparation method of the elastic grinding block of the comparative example is as follows:

[0113] The diamond abrasive 10%, silicon carbide powder 10%, W20 white corundum 5%, alumina 15%, zinc oxide 10%, calcium carbonate 10%, and phenolic resin powder 40% are mixed uniformly after mechanical stirring to obtain a mixed powder;

[0114] The mixed powder is poured into a mold preheated to 50 DEG C, scraped and hot pressed for 20 min (the upper and lower plate temperatures are set to 150 DEG C and 160 DEG C respectively, and the pressure is set to 15 MPa), during which 4-stage exhaust is set, and after hot pressing is completed, demolding is performed, to obtain the elastic grinding block.

[0115] The elastic grinding blocks of examples 1-3 and the comparative example are compared in actual machine processing, the number of square tiles processed is tested, and the comparison is made. See Table 1 for details.

[0116] Table 1 hardness test data of elastic grinding block processing square tiles

[0117] Elastic grinding compact samples number of processing squares (m 2 )]]> Hardness (HD) Example 1 6185 86 Example 2 7350 87 Example 3 7054 87 Comparative Example 4126 90

[0118] As can be seen from Table 1, compared with the traditional powder elastic grinding block (comparative example elastic grinding block), the hardness of the elastic grinding blocks of examples 1-3 is lower and the wear resistance is higher.

[0119] It should be understood that the embodiments disclosed herein are not intended to be limited to the particular features or materials disclosed herein; rather, the disclosure is to be accorded the scope of the appended claims presented in the broadest sense as well as in a more limited sense outside of the patent statutes.

[0120] Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

[0121] Furthermore, the described features or characteristics can be combined in any other suitable manner in one or more embodiments. In the above description, specific details of particular embodiments are provided to provide a thorough understanding of embodiments of the application. However, one skilled in the relevant art will understand that the application can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. An elastic grinding block, characterized in that: Including epoxy resin, curing agent, powder resin bond, diamond abrasive, auxiliary abrasive, filler, toughening agent, coupling agent, defoaming agent, rheological agent, diluent; Based on the total mass of the elastic grinding block, the mass content of the epoxy resin is 20%~30%, the mass content of the curing agent is 10%~30%, the mass content of the powder resin binder is 5%~10%, the mass content of the diamond abrasive is 5%~10%, the mass content of the auxiliary abrasive is 10%~15%, the mass content of the filler is 15%~20%, the mass content of the toughening agent is 3%~6%, the mass content of the coupling agent is 0.5%~1%, the mass content of the defoaming agent is 0.2%~0.5%, the mass content of the rheological agent is 0.3%~0.5%, and the mass content of the diluent is 1%~2%.

2. The elastic grinding block according to claim 1, characterized in that: The epoxy resin is a bisphenol A type epoxy resin with an epoxy value of 0.48 to 0.

54.

3. The elastic grinding block according to claim 1, characterized in that: The powder resin binder is powder phenolic resin or powder melamine resin.

4. The elastic grinding block according to claim 1, characterized in that: The curing agent is one or a combination of two or more of an alicyclic amine curing agent, an acid anhydride curing agent, and an imidazole curing agent.

5. The elastic grinding block according to claim 1, characterized in that: The filler is one or a combination of two or more of aluminum oxide, montmorillonite, calcium carbonate, calcium sulfate whisker, and cerium oxide.

6. The elastic grinding block according to claim 1, characterized in that: The toughening agent is one or a combination of two or more of liquid nitrile rubber, polyvinyl butyral, and silicone rubber.

7. The elastic grinding block according to claim 1, characterized in that: The defoaming agent is a polyether defoaming agent or an organosilicon defoaming agent.

8. The elastic grinding block according to claim 1, characterized in that: The rheological agent is fumed silica, organic bentonite or polyethylene wax.

9. A method for preparing an elastic grinding block, characterized in that: The following steps are involved: Mixing the ingredients: mechanically stir the diamond abrasive, auxiliary abrasive, filler, and powder resin binder until uniform, then add epoxy resin, curing agent, toughening agent, coupling agent, defoaming agent, rheological agent, and diluent and continue stirring until uniform, to obtain a slurry with a viscosity of 15 Pa·s to 20 Pa·s; Hot pressing: pouring the slurry into a preheated mold, scraping it flat and hot pressing it to obtain a rough elastic grinding block; Secondary curing: placing the elastic grinding block blank in an oven for secondary curing to obtain a finished elastic grinding block; Among them, the mass content of the epoxy resin is 20%~30%, the mass content of the curing agent is 10%~30%, the mass content of the powder resin binder is 5%~10%, the mass content of the diamond abrasive is 5%~10%, the mass content of the auxiliary abrasive is 10%~15%, the mass content of the filler is 15%~20%, the mass content of the toughening agent is 3%~6%, the mass content of the coupling agent is 0.5%~1%, the mass content of the defoaming agent is 0.2%~0.5%, the mass content of the rheological agent is 0.3%~0.5%, and the mass content of the diluent is 1%~2%.

10. The method for preparing an elastic grinding block according to claim 9, characterized in that: In the hot pressing step, the temperature of the upper plate of hot pressing is 145°C~155°C, the temperature of the lower plate of hot pressing is 155°C~165°C, the pressure of hot pressing is 8 MPa~12 MPa, and the time of hot pressing is 13min~17min.

11. The method for preparing an elastic grinding block according to claim 10, wherein: In the secondary curing step, the secondary curing temperature is 75° C. to 85° C., and the secondary curing time is 6 h to 8 h.

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