A silicon carbide abrasive product with an uneven surface, its preparation method and application

Abstract

This invention discloses a silicon carbide abrasive product with an uneven surface, its preparation method, and its application. The product includes a substrate and an abrasive coating applied to the surface of the substrate. The abrasive coating is prepared by coating and curing a slurry composed of a cross-linking-inducing protective colloid, a granulatable silicon carbide dispersed phase, and a suspended silicon carbide continuous external phase. This silicon carbide abrasive product specifically replaces the damping cloth + fiber-drawing liquid process, allowing the use of water or abrasive oil, and achieving better abrasive results.

Description

Technical Field

[0001] This invention belongs to the field of abrasive materials technology, specifically relating to a silicon carbide abrasive product with an uneven surface, its preparation method and application, and is particularly suitable for abrasive processing of fiber optic connector ferrules (especially MPO multi-core ferrules). Background Technology

[0002] The Ministry of Industry and Information Technology proposed the "Double G Double Improvement" initiative, aiming to propel both fixed and mobile broadband into the gigabit (Gbit) era, increasing the proportion of broadband users with speeds of 100Mbps and above to 80%, and striving to raise 4G user penetration to 80%. It also implemented the "Same Network, Same Speed" policy, pushing 4G and fiber optic coverage in administrative villages across my country to exceed 98%, achieving basic parity in rural broadband network access capabilities and speeds with urban areas. The initiative accelerated the construction of gigabit fiber optics and 5G, continuously improving the service capabilities of broadband infrastructure. With the further maturation of the Wi-Fi 6 industry, in 2020, the three major operators launched "triple gigabit" services: gigabit 5G + gigabit broadband + gigabit Wi-Fi. Information and communication networks support digital services such as working from home and online learning. As a crucial link in information and communication networks, the optical communication industry has ushered in a new development cycle.

[0003] To achieve high transmission rates, fiber optic connectors, one of the most important passive optical components in fiber optic systems, are also evolving towards multimode and multicore designs. MPO stands for Multi-Position Fiber Optic Connector, which can connect multiple fibers simultaneously, providing high-speed, high-density fiber optic connections. MPO fiber optic connectors are widely used in data centers, communication networks, and high-speed fiber optic transmission systems. They can provide high-density fiber optic connections, reduce rack space occupation, and improve fiber optic transmission efficiency. MPO connectors also feature low insertion loss and high return loss, ensuring stable optical signal transmission. With the rapid development of optical communication technology, especially the rise of 800G / 1.6T high-speed optical module technology, unprecedentedly stringent requirements have been placed on the geometric precision of fiber optic connector end faces. As a key interface for optical signal transmission, the performance of fiber optic connectors directly affects the reliability and transmission efficiency of the entire optical communication system.

[0004] Currently, the commonly used process for MPO ferrule polishing is to use a center-pressure polishing machine, using the following consumables: SC30 → SC16 → SC9 → SC3 → (SC1) → damping cloth + fiber-drawing fluid → damping cloth + polishing fluid. Traditional fiber-drawing processes use fiber-drawing fluid in conjunction with damping cloth. The fiber-drawing fluid contains abrasive particles and chemical additives such as oxidants, pH adjusters, and surfactants. During polishing, these substances can easily remain in the ferrule pin holes, making them difficult to clean. If fiber-drawing fluid remains in the pin holes, it can easily cause defects such as scratches and black / white spots during the final polishing stage, affecting product yield.

[0005] Chinese patent application CN 120572471 A discloses a grinding disc and its preparation method. The grinding disc includes: a substrate; and a grinding layer disposed on one side of the substrate, comprising silicon carbide micropowder, wherein the silicon carbide micropowder is arranged in a concave-convex pattern on the side away from the substrate. The preparation method of the grinding disc includes the following steps: mixing silicon carbide micropowder, acrylic resin, isocyanate, and diluent into a mixture; stirring the mixture under the conditions of rotation speed r, ultrasonic power p, and stirring time T1 to form a slurry; coating the slurry onto the surface of the substrate; baking the slurry surface at a first temperature t1 and a first baking time T2 until it is no longer sticky and then winding it up; and performing a second baking at a second temperature t2 and a second baking time T3 to form the grinding disc. The concave-convex arrangement of this grinding disc makes the fiber height control more stable when grinding the ferrule, and the grinding disc directly adds water for grinding instead of traditional grinding fluid, solving the problems of unstable fiber height control, chemical pollution, and low efficiency in traditional grinding processes. However, in practical applications, the applicant found that grinding discs obtained by using silicon carbide of a single particle size through a single process could not meet the requirements well. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a silicon carbide abrasive product with an uneven surface and a method for preparing the same. The silicon carbide abrasive product is specifically designed to replace the damping cloth + fiber drawing liquid process. It can be used with water or abrasive oil and can achieve better abrasive effect.

[0007] The technical solution of the present invention is as follows:

[0008] A silicon carbide abrasive article with an uneven surface includes a substrate and an abrasive coating applied to the surface of the substrate; the abrasive coating is prepared by coating and curing a slurry composed of a crosslinking-inducing protective colloid, a granulatable silicon carbide dispersed phase, and a suspended silicon carbide continuous external phase.

[0009] The crosslinking-induced protective colloid comprises, by weight: 90-95 parts deionized water, 5-10 parts modified synthetic layered silicate, and 0.2-0.5 parts crosslinking agent;

[0010] The granulizable silicon carbide dispersed phase comprises, by weight: 45-65 parts deionized water, 0.2-0.5 parts dispersant, 0.7-1.2 parts cellulose, 5-10 parts toughening agent, 1-3 parts polyvinyl alcohol, 0.5-1.5 parts defoamer, 0.1-0.3 parts pH adjuster, 20-45 parts emulsion, 0.5-1.5 parts film-forming aid, 0.2-0.4 parts wetting agent, 5-7 parts gelation triggering liquid, and 27-45 parts first silicon carbide micro powder;

[0011] The continuous external phase of suspended silicon carbide comprises, by weight: 15-25 parts deionized water, 0.5-1 parts organic bentonite, 55-70 parts emulsion, 3-10 parts film-forming aid, 0.3-0.5 parts pH adjuster, 0.4-0.8 parts thickener, 1.5-1.8 parts dispersant, and 100-150 parts second silicon carbide micro powder;

[0012] The particle size of the first silicon carbide micro powder is smaller than that of the second silicon carbide micro powder.

[0013] The weight parts mentioned above refer to the relative proportions of each component in its respective phase.

[0014] Preferably, the weight ratio of the crosslinking-induced protective colloid, the granulatable silicon carbide dispersed phase, and the suspended silicon carbide continuous external phase in the slurry is 10:20~30:60~70.

[0015] Preferably, the modified synthetic layered silicate is a synthetic layered silicate material modified with a dispersant, and more preferably, commercially available LAPONITE® S482, which can form a colorless and transparent microgel after hydration and swelling in water; the crosslinking agent is a mixture of aziridine crosslinking agent and borax in a mass ratio of 1:1.

[0016] Preferably, the cellulose in the granulable silicon carbide dispersion phase is a mixture of hydroxyethyl cellulose EHM500, hydroxyethyl cellulose HS100000YP2 and cationic guar gum in a mass ratio of 1:3-4:1-2.

[0017] Preferably, the toughening agent in the granulable silicon carbide dispersion is one of liquid nitrile butadiene flexible agent or polyvinyl chloride flexible agent; the gelation triggering liquid is a 10% LAPONITE® S482 solution.

[0018] Preferably, the first silicon carbide micro powder is green silicon carbide micro powder with a particle size of 0.3μm-0.5μm; the second silicon carbide micro powder is green silicon carbide micro powder with a particle size of 0.8μm-1.2μm.

[0019] Preferably, the substrate is 75μm PET, and an adhesive layer is provided between the substrate and the abrasive coating, the thickness of which is 2-4μm.

[0020] Preferably, the granulable silicon carbide dispersed phase exists in the slurry in the form of particles with a particle size of 1-2 mm; the dry film basis weight of the surface of the polished product is 2.5-3.0 g / 10 cm².

[0021] The present invention also provides a method for preparing the above-mentioned silicon carbide polished article with uneven surface, comprising the following steps:

[0022] (1) Preparation of cross-linking induced protective colloid

[0023] Add deionized water to a container and stir. Add the modified synthetic layered silicate and crosslinking agent while stirring at 1300-1500 rpm and stir for 30-40 minutes.

[0024] (2) Preparation of granulatable silicon carbide dispersion

[0025] Deionized water was added to a container and stirred. Then, dispersant, cellulose, toughening agent, polyvinyl alcohol, defoamer and first silicon carbide micro powder were added in sequence. After ultrasonic dispersion, emulsion, film-forming aid, wetting agent and pH adjuster were added. Finally, gelation triggering liquid was added to obtain a granulatable dispersed phase containing first silicon carbide micro powder.

[0026] (3) Preparation of continuous external phase of suspended silicon carbide

[0027] Add deionized water to a container and stir. Add dispersant and organic bentonite. Then add emulsion, film-forming aid, pH adjuster and second silicon carbide micro powder in sequence and ultrasonically disperse. Finally, add thickener.

[0028] (4) Preparation of spray coating slurry

[0029] Mix the granulable silicon carbide dispersion obtained in step (2) with the crosslinking-induced protective colloid obtained in step (1), cut it first, then granulate it, and then add the continuous external phase of suspended silicon carbide obtained in step (3) and mix it evenly. Adjust the pH value and viscosity.

[0030] (5) Preparation of silicon carbide grinding products

[0031] The slurry obtained in step four is sprayed onto the surface of the substrate, and then subjected to surface drying, hard drying and post-curing treatments in sequence. The resulting polished product is then cut to obtain the polished product.

[0032] Preferably, in step (4), a sieve with an aperture of 1~1.5cm is used for preliminary cutting, and then a granulator is used to cut it into particles of 1-2mm.

[0033] The granulation principle is as follows: After S482 fully swells in water, it forms charged sheet-like colloidal molecules; the cellulose and emulsion molecules in the dispersed phase contain a large number of hydrophilic hydroxyl groups. At the instant the two phases come into contact, the S482 colloid and the hydroxyl groups in the dispersed phase rapidly form hydrogen bonds, generating a dense, flexible, and water-impermeable composite gel film on the surface of the dispersed phase droplets.

[0034] Preferably, in step (5), the spraying process parameters are: nozzle diameter 1.0-2.0mm, spraying pressure 0.3-0.8MPa, spraying distance 20-40cm, and spray gun moving speed 0.1-0.2m / s.

[0035] Preferably, in step (5), the surface drying temperature is 50-70℃ and the drying time is 5min; the actual drying temperature is 90-110℃ and the drying time is 60min; the post-curing temperature is 60℃ and the time is 24h.

[0036] The present invention also provides an application of the above-described silicon carbide polished product with uneven surface or the polished product prepared by the above-described method in the polishing of fiber optic connector ferrules.

[0037] The fiber optic connector ferrule is an MPO multi-core ferrule; the polishing medium is pure water or polishing oil.

[0038] Compared with the prior art, the beneficial effects of the present invention are reflected in:

[0039] (1) The coating of the grinding product of the present invention will gradually fall off during the grinding process due to the grinding of the insert, and form a slurry with water or grinding oil. The surface of the grinding plate has an uneven structure. The uneven structure can form a liquid storage structure during the grinding process, achieving the effect of fiber pulling liquid + damping cloth.

[0040] (2) The dispersed phase of the present invention can be formulated to prepare particles of 1-2 mm, which can withstand large shear force without breaking and can encapsulate silicon carbide micro powder. A multifunctional aziridine crosslinking agent was introduced into the system. When the dispersed phase is added to the protective colloid for granulation, the aziridine crosslinking agent can chemically react with various functional groups on the particle surface, such as carboxyl and hydroxyl groups, to produce chemical crosslinking, forming a crosslinked network structure on the particle surface, thus enhancing the strength and toughness of the particles. A toughening agent was introduced into the system to enhance the cohesive force of the dispersed phase, giving the granulated particles a certain degree of elasticity, allowing them to withstand higher spray pressures without breaking during spraying. Polyvinyl alcohol was introduced into the system. When the dispersed phase is added to the protective colloid for granulation, a gelation reaction can occur under the action of borax, further increasing the toughness of the particles, allowing them to be stretched to a certain extent without breaking under external force. Cellulose EHM500 can undergo an association reaction with emulsion AP4765, forming a physical crosslinked structure within the dispersed phase, further increasing the strength of the particles. Cellulose EHM500 and cationic guar gum can react with the gelation triggering liquid to enhance the thixotropic properties of the particles, allowing the particles to better encapsulate silicon carbide micropowder during the granulation stage without breaking.

[0041] (3) Two different particle sizes of silicon carbide micro powder were used to form differential grinding to achieve the fiber pulling effect. The experiment showed that if the dispersed phase and the continuous phase used silicon carbide with the same particle size (comparative examples 1 and 2), the fiber height would exceed the standard and fail to meet the MPO patch cord specifications. Attached Figure Description

[0042] Figure 1Image of the grinding disc obtained in Example 1;

[0043] Figure 2 This is a 100x magnified SEM image of the grinding disc obtained in Example 1;

[0044] Figure 3 This is a picture of the product after fiber pulling in Example 5;

[0045] Figure 4 This is a picture of the product after polishing in Example 5. Detailed Implementation

[0046] The materials used in the following embodiments are as follows:

[0047] Crosslinking-induced protective colloids:

[0048] The modified synthetic layered silicate is LAPONITE® S482, a synthetic layered silicate material modified with a special dispersant, which can form a colorless and transparent microgel after hydration and swelling in water.

[0049] The crosslinking agent is a mixture of aziridine crosslinking agent and borax in a mass ratio of 1:1.

[0050] Granulable silicon carbide dispersion:

[0051] The dispersant mentioned is OROTAN 731A, a general-purpose sodium polycarboxylate dispersant;

[0052] The cellulose is a mixture of hydroxyethyl cellulose EHM500, hydroxyethyl cellulose HS100000YP2 and cationic guar gum in a mass ratio of 1:3-4:1-2;

[0053] The toughening agent is one of liquid nitrile butadiene flexible agent (carboxylated nitrile butadiene latex) or polyvinyl chloride flexible agent (waterborne polyvinyl chloride emulsion);

[0054] The polyvinyl alcohol mentioned is PVA 1788;

[0055] The defoamer mentioned is FoamStar A10 from Corning.

[0056] The pH adjuster is Dow Chemical's AMP-95;

[0057] The emulsion is a mixture of LR 7115 and AP 4765 in a mass ratio of 1:1;

[0058] The film-forming aid is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate;

[0059] The wetting agent is Dow X-405;

[0060] The gelation triggering solution is a 10% LAPONITE® S482 solution;

[0061] The silicon carbide micro powder is green silicon carbide micro powder with a particle size of 0.3μm-0.5μm.

[0062] Suspended silicon carbide continuous external phase:

[0063] The organic bentonite mentioned above is prepared by modifying ordinary calcium-based bentonite with organic cationic surfactants after activation treatment. It is the bentonite with the brand name MZ from Shanghai Grid International Trade Co., Ltd.

[0064] The emulsion is a mixture of AC 3630 and AC 3600 in a ratio of 15-20:50-55;

[0065] The film-forming aid is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate;

[0066] The pH adjuster is Dow Chemical's AMP-95;

[0067] The dispersant mentioned is OROTAN 731A, a general-purpose sodium polycarboxylate dispersant;

[0068] The thickener mentioned is ACRYSOL TT-935, which is a hydrophobically modified alkali-soluble emulsion thickener.

[0069] The silicon carbide micro powder is green silicon carbide micro powder with a particle size of 0.8μm-1.2μm.

[0070] The abrasive products are prepared by spraying, using 75μm PET as the substrate. To enhance the adhesion between the coating and the substrate, the substrate is pre-coated with a primer, which is AC2010 and has a thickness of 2-4μm.

[0071] General preparation method:

[0072] 1. Preparation of cross-linking induced protective adhesive

[0073] [1] Add deionized water to a suitable container and turn on the stirrer;

[0074] [2] Add modified synthetic layered silicate and crosslinking agent under stirring at 1300-1500 rpm, and stir for 30-40 min;

[0075] [3] Fill the crosslinking-inducing protective gel into a suitable container for later use.

[0076] 2. Preparation of Granulable Silicon Carbide Dispersed Phase

[0077] [1] Add deionized water to a suitable container and turn on the stirrer;

[0078] [2] Add the dispersant slowly and evenly while stirring at 300-500 rpm for 1-2 minutes;

[0079] [3] Add cellulose while stirring at 600-800 rpm and stir for 5-10 minutes;

[0080] [4] Add toughening agent, polyvinyl alcohol, defoamer and silicon carbide powder slowly while stirring at 700-900 rpm. After adding, transfer the container to an ultrasonic cleaner with an ultrasonic frequency of 30-35 kHz and adjust the speed to 1200-1500 rpm. Stir for 20-30 minutes.

[0081] [5] While stirring at 1000-1200 rpm, slowly add the emulsion, film-forming aid, wetting agent and pH adjuster in sequence, and stir for 5-10 min;

[0082] [6] Turn off the ultrasound, add the gelation triggering solution while stirring at 1100-1300 rpm, and stir for 8-10 min;

[0083] [7] The granulable silicon carbide dispersion is filled into a suitable container for later use.

[0084] 3. Preparation of continuous external phase of suspended silicon carbide

[0085] [1] Add deionized water to a suitable container;

[0086] [2] Add dispersant and organic bentonite under stirring at 900-1100 rpm, and stir for 20 min;

[0087] [3] Add the emulsion, film-forming aid and pH adjuster in sequence under stirring at 800-1000 rpm, and stir for 10 min;

[0088] [4] Transfer the container to an ultrasonic cleaner, with an ultrasonic frequency of 30-35kHz and stirring at 1100-1300rpm.

[0089] Add silicon carbide powder and stir for 20-30 minutes;

[0090] [5] Add the thickener slowly while stirring at 1100-1300 rpm for 10-15 minutes;

[0091] [6] The suspended silicon carbide continuous external phase is filled into a suitable container for later use.

[0092] 4. Preparation of spray coating paste

[0093] [1] Weigh out the crosslinking-inducing protective adhesive, the granulable silicon carbide dispersed phase, and the suspended silicon carbide continuous external phase in sequence according to the ratio of 10:20-30:60-70 for later use;

[0094] [2] Add the granulated silicon carbide dispersion to the crosslinking-induced protective colloid, and use a sieve with a pore size of about 1 cm to perform preliminary cutting to cut the dispersion into particles of 1 cm size. Then use a granulator to cut the dispersion into particles of 1-2 mm size.

[0095] [3] Slowly add the suspended silicon carbide continuous external phase while stirring at 100-200 rpm, and mix until evenly dispersed;

[0096] [4] Add 1‰ of pH adjuster and 3‰-5‰ of thickener ACRYSOL TT-935 by the total mass of the slurry and stir.

[0097] 5. Preparation of abrasive products

[0098] [1] An airless sprayer with a nozzle diameter of 1.0-2.0 mm, a spraying pressure of 0.3-0.8 MPa, a spraying distance of 20-40 cm, and a spray gun moving speed of 0.1-0.2 m / s was used to spray the slurry onto PET.

[0099] [2] Place the product in an oven at 50-70℃ and bake for 5 minutes until the coating is dry;

[0100] [3] Place the product in an oven at 90-110℃ and bake for 60 minutes until the coating is completely dry. Then transfer it to an oven at 60℃ and cure for 24 hours.

[0101] [4] After drying, the dry film basis weight is 2.5-3.0 g / 10 cm³. 2 ;

[0102] [5] The product is cut into φ127mm round pieces, which are the grinding products of the present invention. The images of the products obtained in Example 1 are shown below. Figure 1 and Figure 2 .

[0103]

[0104]

[0105] Comparative Example 1

[0106] Comparative Example 1 refers to Example 1, but the silicon carbide micro powder in the dispersed phase is replaced with silicon carbide micro powder in the continuous external phase, that is, the two particle sizes of silicon carbide micro powder are not used.

[0107] Comparative Example 2

[0108] Comparative Example 2 refers to Example 1, but the silicon carbide micro powder in the continuous phase is replaced with silicon carbide micro powder in the dispersed phase, that is, the two particle sizes of silicon carbide micro powder are not used.

[0109] Comparative Example 3

[0110] Comparative Example 3, referring to Example 1, did not involve granulation; a planar structure was obtained through spraying. Specifically, the cross-linking-inducing protective colloid was removed during the preparation of Comparative Example 2, the granulated silicon carbide dispersion phase was not mixed with a gelation triggering liquid, and the remaining components were mixed uniformly after preparation, and the viscosity was adjusted before spraying.

[0111] Comparative Example 4

[0112] Comparative Example 4 refers to Example 1, with a particle size of 2-4 mm.

[0113] Comparative Example 5

[0114] Comparative Example 5 is the same as Example 1, but the toughening agent and polyvinyl alcohol are removed from the dispersed phase.

[0115] Examples 4-12 are application examples or comparative application examples.

[0116] A central pressure grinding machine was used, with a glass pad as the grinding pad. The grinding medium for the grinding process was pure water. The grinding process for the fiber drawing process involved using a white cloth with silicon carbide fiber drawing fluid, denoted as the conventional process. When the grinding disc of this invention was used in the fiber drawing process, the grinding medium was pure water. Under the conditions shown in Table 1, the MPO ferrule was ground. All consumables used in the test were products of Shaoxing Ziyuan Abrasives Co., Ltd.

[0117] Table 1 Grinding process and parameters

[0118]

[0119] Table 2 List of Application Examples

[0120]

[0121] The test results are shown in Table 3. The test results of Examples 4-7 meet the specifications of MPO jumpers (wherein, Figure 3 This is a picture of the fiber after fiber pulling in Example 5. Figure 4 The image shown is of Example 5 after polishing, illustrating that the present invention can replace conventional processes to complete the polishing step of fiber drawing. However, the maximum fiber height in Example 8 (2670 nm) exceeds the upper limit of the specification (2500 nm), and the fiber heights in Examples 9-12 are below the lower limit or the fiber height difference exceeds the standard, all of which do not meet the requirements.

[0122] Table 3 Parameters of fiber optic patch cords after polishing

[0123]

[0124] The results of the above embodiments show that the present invention uses two silicon carbide micro powders with different particle sizes to form differentiated grinding and achieve the effect of fiber pulling. The experiment shows that if silicon carbide with a single particle size is used in both the dispersed phase and the continuous phase (Comparative Example 1), the fiber height will exceed the standard and cannot meet the MPO patch cord specifications.

Claims

1. A silicon carbide abrasive product with an uneven surface, characterized in that, The invention includes a substrate and an abrasive coating applied to the surface of the substrate; the abrasive coating is prepared by coating and curing a slurry composed of a crosslinking-inducing protective colloid, a granulatable silicon carbide dispersed phase, and a suspended silicon carbide continuous external phase. The crosslinking-induced protective colloid comprises, by weight: 90-95 parts deionized water, 5-10 parts modified synthetic layered silicate, and 0.2-0.5 parts crosslinking agent; The granulizable silicon carbide dispersed phase comprises, by weight: 45-65 parts deionized water, 0.2-0.5 parts dispersant, 0.7-1.2 parts cellulose, 5-10 parts toughening agent, 1-3 parts polyvinyl alcohol, 0.5-1.5 parts defoamer, 0.1-0.3 parts pH adjuster, 20-45 parts emulsion, 0.5-1.5 parts film-forming aid, 0.2-0.4 parts wetting agent, 5-7 parts gelation triggering liquid, and 27-45 parts first silicon carbide micro powder; The continuous external phase of suspended silicon carbide comprises, by weight: 15-25 parts deionized water, 0.5-1 parts organic bentonite, 55-70 parts emulsion, 3-10 parts film-forming aid, 0.3-0.5 parts pH adjuster, 0.4-0.8 parts thickener, 1.5-1.8 parts dispersant, and 100-150 parts second silicon carbide micro powder; The particle size of the first silicon carbide micro powder is smaller than that of the second silicon carbide micro powder.

2. The silicon carbide abrasive product with an uneven surface according to claim 1, characterized in that, The weight ratio of the crosslinking-induced protective colloid, the granulable silicon carbide dispersed phase, and the suspended silicon carbide continuous external phase is 10:20~30:60~70.

3. The silicon carbide abrasive product with an uneven surface according to claim 1, characterized in that, The modified synthetic layered silicate is a synthetic layered silicate material modified with a dispersant; the crosslinking agent is a mixture of aziridine crosslinking agent and borax in a mass ratio of 1:

1.

4. The silicon carbide abrasive article with an uneven surface according to claim 1, characterized in that, In the granulable silicon carbide dispersion phase, the cellulose is a mixture of hydroxyethyl cellulose EHM500, hydroxyethyl cellulose HS100000YP2 and cationic guar gum in a mass ratio of 1:3-4:1-2. The toughening agent is either a liquid nitrile butadiene flexible agent or a polyvinyl chloride flexible agent; the gelation triggering liquid is a 10% LAPONITE® S482 solution.

5. The silicon carbide abrasive product with an uneven surface according to claim 1, characterized in that, The first silicon carbide micro powder is green silicon carbide micro powder with a particle size of 0.3μm-0.5μm; the second silicon carbide micro powder is green silicon carbide micro powder with a particle size of 0.8μm-1.2μm.

6. The silicon carbide abrasive article with an uneven surface according to claim 1, characterized in that, The substrate is a 75μm thick polyethylene terephthalate (PET) film, and an adhesive layer with a thickness of 2-4μm is provided between the substrate and the abrasive coating. The granulizable silicon carbide dispersed phase exists in the slurry as particles with a particle size of 1-2 mm; the dry film basis weight of the surface of the ground product is 2.5-3.0 g / 10 cm³. 2 .

7. A method for preparing a silicon carbide polished article with an uneven surface as described in any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Preparation of cross-linking induced protective colloid Add deionized water to a container and stir. Add the modified synthetic layered silicate and crosslinking agent while stirring at 1300-1500 rpm and stir for 30-40 minutes. (2) Preparation of granulatable silicon carbide dispersion Deionized water was added to a container and stirred. Then, dispersant, cellulose, toughening agent, polyvinyl alcohol, defoamer and first silicon carbide micro powder were added in sequence. After ultrasonic dispersion, emulsion, film-forming aid, wetting agent and pH adjuster were added. Finally, gelation triggering liquid was added to obtain a granulatable dispersed phase containing first silicon carbide micro powder. (3) Preparation of continuous external phase of suspended silicon carbide Add deionized water to a container and stir. Add dispersant and organic bentonite. Then add emulsion, film-forming aid, pH adjuster and second silicon carbide micro powder in sequence and ultrasonically disperse. Finally, add thickener. (4) Preparation of spray coating slurry Mix the granulable silicon carbide dispersion obtained in step (2) with the crosslinking-induced protective colloid obtained in step (1), cut it first, then granulate it, and then add the continuous external phase of suspended silicon carbide obtained in step (3) and mix it evenly. Adjust the pH value and viscosity. (5) Preparation of silicon carbide grinding products The slurry obtained in step four is sprayed onto the surface of the substrate, and then subjected to surface drying, hard drying and post-curing treatments in sequence. The resulting polished product is then cut to obtain the polished product.

8. The method for preparing a silicon carbide polished product with an uneven surface according to claim 7, characterized in that, In step (4), a sieve with an aperture of 1~1.5cm is used for preliminary cutting, and then a granulator is used to cut it into particles of 1-2mm.

9. The method for preparing a silicon carbide polished product with an uneven surface according to claim 7, characterized in that, In step (5), the spraying process parameters are: nozzle diameter 1.0-2.0mm, spraying pressure 0.3-0.8MPa, spraying distance 20-40cm, and spray gun moving speed 0.1-0.2m / s; The surface drying temperature is 50-70℃, and the drying time is 5 min; the actual drying temperature is 90-110℃, and the drying time is 60 min; the post-curing temperature is 60℃, and the time is 24 h.

10. The application of a silicon carbide polishing product as described in any one of claims 1 to 7, or a silicon carbide polishing product obtained by the preparation method described in claim 8 or 9, in the polishing of fiber optic connector ferrules, characterized in that, The fiber optic connector ferrule is an MPO multi-core ferrule; the polishing medium is pure water or polishing oil.

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