Highly resilient coating and method for its production, highly resilient coating and ceramic tile

Abstract

The application discloses a kind of high resilience coating and preparation method thereof, high resilience coating and a kind of ceramic tile, specifically related to coating field, the raw material of preparation high resilience coating includes corundum powder and elastic resin composition, the particle size of corundum powder is <150 microns, according to weight ratio, elastic resin composition:corundum powder is 100:2~5, the present application will be dispersed into elastic resin composition and form the antagonistic skeleton of corundum powder, utilize the toughness and high resilience performance of elastic resin material and carry out buffer, reduce the wear mark within elastic limit, further improve wear resistance.The high resilience coating provided by the present application can effectively reduce the generation of wear marks within the elastic limit when applied to the surface of ceramic tiles after a long period of use. At the same time, the coating has good transparency after solidification, and the glaze texture pattern can be clearly observed under light.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coating, in particular to a high resilience coating, a preparation method thereof, a high resilience coating layer and a ceramic tile. BACKGROUND

[0002] With the increasing popularity of ceramic tiles, users have increasingly high requirements for the wear resistance of ceramic tiles. A typical structure of a ceramic tile, from bottom to top, is composed of a ceramic body, a bottom glaze, a color glaze and a protective glaze. The hardness of the uppermost protective glaze usually plays a decisive role in the wear resistance of the ceramic tile. In the prior art, the wear resistance is often improved by increasing the Mohs hardness of the protective glaze.

[0003] The existing technical means is to use high-melting-point and high-silicon-aluminum-content glaze as the raw material of the protective glaze, and to sinter at a high temperature of 1280 DEG C or above, or to add a large proportion of 20% to 40% of hard materials such as high-silicon-high-aluminum dry particles, high-purity quartz powder and high-purity fused corundum powder to the protective glaze. Through the above technical means, the wear resistance of high-quality light-colored glazed ceramic tiles on the market can reach the level of 4 (1500 revolutions) in the national standard "Ceramic Tiles" (GB / T4100-2015), and the wear resistance of similar protective glazes applied to dark-colored glazed ceramic tiles is reduced to level 2 (600 revolutions). In the wear resistance test, the impact force of corundum powder and steel balls on the surface of the ceramic tile will inevitably cause obvious wear on the surface of the ceramic tile. Similarly, after long-term use in practice, the wear marks on the surface of the ceramic tile will become more and more obvious. On dark-colored glazed ceramic tiles, the white wear marks or wear marks are more obvious than light-colored glazed ceramic tiles, and the wear resistance is lower in the existing national standard wear resistance test method.

[0004] When the wear resistance of dark-colored glazed ceramic tiles is improved by the above technical means, the sintering temperature is too high, which leads to a high degree of vitrification of the body, an increase in brittleness, and a higher risk of breakage or wear and scratch. Or because the sintering temperature is insufficient, the protective glaze appears white on the surface during the firing process, thereby reducing the transmittance and making it difficult to clearly observe the original texture pattern of the glaze under light. SUMMARY

[0005] The main purpose of the present application is to provide a high resilience coating, and the ceramic tile using the same can effectively reduce the generation of wear marks and maintain good transmittance, which is sufficient to clearly observe the texture pattern of the glaze under light. The present application aims to solve the technical problem that the wear resistance of ceramic tiles is improved by increasing the high-silicon-aluminum-content and high-melting-point glaze in the protective glaze in the prior art, and after long-term use, the ceramic tile surface will produce obvious wear marks. Furthermore, the present application further solves the technical problem that the dark-colored glazed ceramic tile has insufficient sintering temperature, which leads to white on the surface of the protective glaze during the firing process, thereby reducing the transmittance.

[0006] The technical means of improving the wear resistance by increasing the Mohs hardness of the glaze of the protective glaze cannot completely solve the technical problem of the wear marks left on the surface of the ceramic tile after the national standard wear test, and this problem is particularly obvious on the surface of dark bricks, the present application starts from another idea, according to Hooke's law, when the elastic object is subjected to a force that does not exceed its elastic limit, the elastic object can restore to its original state, the present application mainly explores a kind of high resilience coating applicable to ceramic tiles, which improves the wear resistance by using the elasticity of the coating, greatly reduces the wear marks that may be produced on the surface of the ceramic tile when corundum powder and steel balls are ground at high speed within the elastic limit. The existing elastic coating also claims to improve the wear resistance, but the improvement of the wear resistance of the existing coating is mainly to enhance the hardness of the surface coating and improve the scratch resistance, and after long-term use, obvious scratches and wear will still occur on the surface of the coating. The grinding medium for the conventional wear test of the general coating is some rubber / broth / steel wool, etc., which is repeatedly rubbed by a reciprocating friction machine, and the surface damage degree is observed. For ceramic tiles, the quality guarantee period of ceramic tiles can reach more than ten years, and the performance requirements of the coating applied to ceramic tiles are higher. For ceramic tiles, the wear resistance test process is to mix corundum powder and steel balls and water in a certain proportion as a grinding medium, and rotate at high speed on the surface of the ceramic tile to cause impact force on the surface of the ceramic tile and damage the surface, so as to determine the wear resistance. The impact force is obviously different from the grinding medium of the general coating.

[0007] To achieve the purpose of the application, the present application provides a kind of high resilience coating, the raw materials for preparing the high resilience coating include corundum powder and elastic resin composition, the particle size of the corundum powder is < 150 microns, and the weight ratio of the elastic resin composition to the corundum powder is 100:2-5.

[0008] In the present application, a small amount of corundum powder is dispersed into the elastic resin composition to form a resistant skeleton, which prevents the surface from being damaged by the impact force of the grinding medium through the resilience of the resin and the local resistance of the formed skeleton, and improves the wear resistance. When the impact force of the grinding medium is within the elastic limit of the coating, there is no obvious wear mark.

[0009] The addition amount and fineness of corundum powder are particularly crucial to solve the problem of the present application. In the field of coatings, it is known to add wear-resistant fillers to improve the coating formed after the coating is applied. However, a large amount of wear-resistant fillers is usually required to achieve good wear resistance, which is not applicable to the field of ceramic tiles. During the use of ceramic tiles, the wear is intermittent, and the service life of the ceramic tiles is very long (more than 10 years). In addition, in addition to avoiding scratches caused by wear, the texture of the ceramic tile under the coating should be clearly visible. Therefore, the applicant improves the wear resistance of the coating by adding a small amount of fine corundum powder. The fine corundum powder is dispersed in the coating. When external impact is applied to the surface of the coating, it can better transmit the impact force. At the same time, the elasticity of the resin material is used to absorb the impact force. A small amount of fine corundum powder has little effect on the transparency of the coating. The coating applied to the surface of the ceramic tile can well protect the ceramic tile from wear during daily use, and has no adverse effect on the decorative effect of the ceramic tile.

[0010] The elastic resin composition refers to a series of compositions that can be cured to form an elastic resin, such as an elastic resin composition that can form an elastic resin after photocuring, including a photocuring resin, an active diluent, and a photoinitiator. The photocuring resin is typically an acrylic resin or an acrylic modified resin or an acrylic oligomer, which has a suitable crosslinking density and forms a transparent and elastic coating after curing. Photocuring is efficient and usually only takes a few minutes to complete, so it is suitable for industrialization. For example, an elastic resin composition that can form an elastic resin after thermal curing, including a thermal curing resin and a curing agent. The thermal curing resin is typically an epoxy-polyurethane resin. The elastic resin composition of the thermal curing resin usually needs to be cured at a high temperature of 200-300°C for more than 30 minutes. The curing conditions are difficult to match the production line speed, which reduces the production efficiency, but it can also be used.

[0011] The above-mentioned elastic resin composition forms a resistant skeleton after adding corundum powder and dispersing, which improves the wear resistance of the elastic resin. When the present application is applied to the surface of a ceramic tile, the coating has good transparency after curing, and the glaze texture pattern can be clearly observed under light.

[0012] Due to the higher curing efficiency of photocuring, it is suitable for industrialization. The present application further studies high-rebound coatings in the direction of photocuring. The present application provides a formula of high-rebound coating, which is composed of corundum powder pre-dispersion and elastic resin composition. For easy proportioning, the corundum powder pre-dispersion includes 8-12 parts of corundum powder, 8-12 parts of dispersant, and 48-64 parts of active diluent. The elastic resin composition includes 20-40 parts of photocuring resin, 4-20 parts of photoinitiator, and 252-296 parts of active diluent.

[0013] The composition ratio of the corundum powder pre-dispersed solution helps to form a stable suspension with good storage stability, and also helps to uniformly disperse the corundum powder into the elastic resin composition, so that the transmittance is better and the glaze texture pattern is easier to observe.

[0014] Further preferably, the particle size distribution of the corundum powder is 800 mesh (-) to 3000 mesh (+): 3000 mesh (-) to 5000 mesh (+): 5000 mesh (-) to 8000 mesh (+): 8000 mesh (-) = 4:7:3:1 by weight ratio, and the corresponding particle size distribution of the corundum powder is <1.875 microns: 1.875-3 microns: 3-5 microns: 5 microns-18.75 microns = 1:3:7:4 by weight ratio. With the preferred particle size distribution, the formed corundum powder is more reasonably distributed in the elastic resin composition, and the wear resistance is improved, even if the coating is as thin as 0.2 mm, it also has good protective effect.

[0015] Preferably, the photocurable resin uses one or more of acrylic resin or acrylic modified resin, such as HDDA, PDDA, propoxylated 1,6-hexanediol diacrylate, or dimethylaminoethyl acrylate.

[0016] Specifically, TPO is typically but not limitedly used as a photoinitiator.

[0017] Specifically, the active diluent can use one or more of morpholine acrylate (ACMO), isobutyl methacrylate (IBOA), or dimethylaminoethyl methacrylate (DMAEMA).

[0018] Specifically, the dispersant can use PX4310 (Efka).

[0019] In order to broaden the application scenarios, so that the high-rebound coating applied on the surface of ceramic tiles meets the requirements of long-term flushing of water or even hot water resistance, and avoids the peeling of the coating, further preferably, the elastic resin composition further comprises 20-40 parts by weight of water-resistant photocurable oligomer, and the active diluent in the elastic resin composition is 252-274 parts by weight. The coating formed by such coating can be applied to environments such as bathrooms, shower rooms, etc.

[0020] Specifically, the water-resistant photocurable oligomer is one or more of trimethylolpropane triacrylate, ten-functional polyurethane acrylate, or polyurethane acrylate. Exemplarily, trimethylolpropane triacrylate can use Agisyn2811TMPTA produced by Shanghai Guangyi Chemical Co., Ltd., ten-functional polyurethane acrylate can use LuCure8531 produced by Guangzhou Runao Chemical Material Co., Ltd., and polyurethane acrylate can use BRT6202 produced by Guangzhou Wotuxin Material Co., Ltd.

[0021] The application further provides a preparation method of the high resilience coating, which comprises uniformly stirring and dispersing all components in the high resilience coating raw material according to any one of the above schemes. Specifically, the raw material is stirred and dispersed by using a dispersing agent, and the stirring is performed by a dispersing machine at a rotating speed of 800 r / min for 30 min to obtain the high resilience coating.

[0022] Further, the corundum powder is prepared into a corundum powder pre-dispersed solution, and the preparation steps include:

[0023] S1. uniformly stirring and dispersing the corundum powder, the dispersing agent and the active diluent in the corundum powder pre-dispersed solution raw material to obtain a slurry;

[0024] S2. grinding and dispersing the slurry obtained in step S1, and then passing through a 100-mesh sieve;

[0025] S3. continuously stirring and dispersing the slurry obtained by sieving in step S2, and repeating the above steps until the corundum powder is suspended and dispersed in the slurry to obtain the corundum powder pre-dispersed solution.

[0026] Specifically, in step S2, the slurry is ground in a sand mill by using 95 gage beads or glass beads with a size of 0.6-0.8 mm and a ball material mass ratio of 3:8. Since the Mohs hardness of the gage beads or glass beads is lower than that of the corundum, the grinding of the slurry in the sand mill has little effect on the corundum powder, and the suitable ball material mass ratio and grinding material mainly play a role in making the components of the slurry more uniformly dispersed.

[0027] Preferably, in step S3, the slurry after sieving is put into a dispersing machine for stirring and dispersion, and the stirring and dispersion-grinding step is repeated for 1.5 h. After the circulation step, the corundum powder pre-dispersed solution which is uniformly dispersed and can be stably suspended is finally obtained, and the obtained corundum powder pre-dispersed solution is easy to store and not easy to settle, which is helpful to maintain good touch after the coating is cured.

[0028] The application further provides a high resilience coating formed by curing the high resilience coating according to any one of the above schemes.

[0029] In the application for the application of the ceramic tile, the high resilience coating is applied to the surface of the fired ceramic tile body, and is cured to obtain the high resilience coating. It can also be used for tile repair, joint filling, etc. Specifically, the application method can be screen printing for thin layer application, and multiple applications can also be performed, but the application method is not limited to screen printing, and those skilled in the art can use known application methods.

[0030] Specifically, the high-rebound coating has good wear resistance improvement effect when the applied thickness is greater than 0.3 mm, and the applied thickness is preferably 0.5-0.8 mm. Of course, under the more preferred particle size ratio of corundum powder, the coating thickness can be as low as 0.2 mm and still has good protection effect. In a specific photocuring embodiment, the high-rebound coating is applied on the fired ceramic tile body by 80-mesh screen printing, the applied thickness is 0.5 mm, and the ceramic tile body is cured by a photocuring machine, and the curing time is 2-3 min.

[0031] The application also provides a ceramic tile structure, which comprises a body layer, a bottom glaze layer, a printing layer and a high-rebound coating from bottom to top, and the high-rebound coating is formed by curing the high-rebound coating provided by any of the above-mentioned schemes. Of course, any ceramic tile can use the high-rebound coating provided by the application to improve wear resistance, and further, the high-rebound coating provided by the application can also be applied on the surface of other materials that need to improve wear resistance.

[0032] Beneficial effects: The application disperses a small amount of corundum powder into an elastic resin composition to form a resistant skeleton, uses the toughness and high-rebound performance of the elastic resin material to buffer, reduces the wear marks within the elastic limit, and further improves the wear resistance. The high-rebound coating provided by the application can effectively reduce the generation of wear marks within the elastic limit when applied on the surface of a ceramic tile after a long period of use, and at the same time, the coating has good transparency after curing, and the glaze texture pattern can be clearly observed under light. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in 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 some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0034] Figure 1 For example 1-1, after 3-stage 750 rpm wear test, 200x microscope magnification figure;

[0035] Figure 2 For example 1-1, after 4-stage 1500 rpm wear test, 200x microscope magnification figure.

[0036] The implementation, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application. In addition, the technical solutions of various embodiments can be combined with each other, but it should be considered that the combination of the technical solutions does not exist and is not within the protection scope of the present application when the combination of the technical solutions is contradictory or unachievable on the basis that a person of ordinary skill in the art can achieve.

[0038] Performance characterization method:

[0039] (1) Wear resistance grade: tested and determined according to the test method for wear resistance in “Ceramic tiles” (GB / T 4100-2015);

[0040] (2) Translucency: the translucency is commonly used in the art to evaluate the observation effect of the glaze surface of ceramic tiles, and a person skilled in the art evaluates the translucency by observing the actual situation of the glaze texture pattern through the coating under light irradiation.

[0041] (3) Adhesion performance: PCT test under two atmospheres for 1h is used to test the aging of the coating, and the PCT test specifically refers to 121℃ (temperature) / 100% RH (relative humidity) / 2atm (atmospheric pressure), and after one hour, hot water flushing test is performed at a pressure of 0.6Mpa, and 65℃ hot water is used. If there is peeling, the adhesion is poor, and if there is no peeling, the adhesion is better. The above test method is used to evaluate the adhesion of the coating on the surface of the ceramic tile after experiencing long-time hot water flushing.

[0042] (4) Microscopic observation: place the relevant embodiments under a microscope and magnify 200 times to observe the completeness of the water lines on the surface of the coating.

[0043] Embodiment one is provided for specific embodiments to prepare a high-resilience coating.

[0044] Embodiment one

[0045] A high-resilience coating is provided, and the raw materials are composed of corundum powder pre-dispersion liquid and weight fraction elastic resin composition. According to the weight fraction, the corundum powder pre-dispersion liquid is composed of 12 parts of corundum powder, 12 parts of dispersing agent and 56 parts of active diluent, and the elastic resin composition is composed of 20 parts of photocuring resin, 20 parts of photoinitiator and 260 parts of active diluent.

[0046] Specifically, the corundum powder in the raw material is passed through an 800-mesh sieve, and the particle size distribution is 3:3:3:1 by mass ratio of 800 mesh (-) -3000 mesh (+) : 3000 mesh (-) -5000 mesh (+) : 5000 mesh (-) -8000 mesh (+) : 8000 mesh (-).

[0047] Specifically, the dispersant in the raw material is PX4310 (BASF), the active diluent is acrylic morpholine (ACMO), the photocurable resin is HDDA, and the photoinitiator is TPO:183, which are mixed in a mass ratio of 5:1. The above materials are commercially available.

[0048] The preparation steps include the following steps: (1) preparing a corundum powder pre-dispersion; (2) stirring and dispersing all components in the raw material uniformly to obtain a high-rebound coating.

[0049] In step (1), the preparation steps of the corundum powder pre-dispersion include:

[0050] S1. The corundum powder, dispersant and active diluent in the raw material of the corundum powder pre-dispersion are weighed according to the mass fraction ratio of 4 kg (Note: In this embodiment, 1 weight fraction = 0.05 kg) and put into a bucket for mixing. After the slurry is obtained by stirring and dispersing the raw material using a disperser,

[0051] S2. The slurry obtained in step S1 is ground and dispersed and then sieved;

[0052] S3. The slurry obtained by sieving in step S2 is continuously stirred and dispersed-ground and dispersed-sieved and the above steps are cycled to obtain a corundum powder pre-dispersion.

[0053] Specifically, in step S1, the disperser is stirred at 800 r / min for 20 min to obtain the slurry, and then the speed is reduced to 500 r / min for standby.

[0054] Specifically, in step S2, 1.5 kg of 95 diamond beads (particle size 0.6-0.8 mm) is added to a 0.5L horizontal sand mill, the slurry in the cylinder is pumped into the sand mill for grinding, and then sieved after grinding. The screen aperture is 0.15 mm and the linear speed is 10 m / s.

[0055] Specifically, in step S3, the slurry after sieving is put into the disperser for stirring and dispersing at a speed of 500 r / min, and then the stirring and dispersing-grinding and dispersing-sieving steps are cycled, and the cycle time is 1.5 h.

[0056] In step (2), the raw materials were weighed according to the mass fraction ratio, put into a barrel, mixed, and stirred at 800 r / min for 30 min to obtain the finished coating, which was then applied on the surface of the fired ceramic tile body once through 80-mesh screen printing, with an application thickness of 0.5 mm, and was cured through a light curing machine UV for 2-3 min to obtain a high-rebound coating, and the high-rebound coating was subjected to performance testing.

[0057] The glaze surface of the ceramic tile body has obvious texture patterns.

[0058] Example 1-1

[0059] The raw materials and specific preparation steps refer to Example 1, and the coating finished product was prepared and subjected to performance testing.

[0060] Example 1-2

[0061] The preparation steps and parameters were consistent with those of Example 1-1, except that the corundum powder in the raw materials passed through a 3000-mesh sieve, and the coating finished product was prepared and subjected to performance testing.

[0062] Example 1-3

[0063] The preparation steps and parameters were consistent with those of Example 1-1, except that the corundum powder in the raw materials passed through a 500-mesh sieve, and the coating finished product was prepared and subjected to performance testing.

[0064] Example 1-4

[0065] The preparation steps and parameters were consistent with those of Example 1-1, except that the corundum powder in the raw materials passed through a 100-mesh sieve, and the coating finished product was prepared and subjected to performance testing.

[0066] Comparative Example 1

[0067] The preparation steps and parameters were consistent with those of Example 1-1, except that the corundum powder in the raw materials passed through a 50-mesh sieve, and the coating finished product was prepared and subjected to performance testing.

[0068] Example 2-1

[0069] The preparation steps and parameters were consistent with those of Example 1-1, except that the weight fraction of the corundum powder in the raw materials was 8 parts, and the coating finished product was prepared and subjected to performance testing.

[0070] Example 2-2

[0071] The preparation steps and parameters were consistent with those of Example 1-1, except that the weight fraction of the corundum powder in the raw materials was 10 parts, and the coating finished product was prepared and subjected to performance testing.

[0072] Comparative Example 2-1

[0073] The preparation steps and parameters are consistent with Example 1-1, except that the weight fraction of corundum powder in the raw materials is 16 parts, and the coating product is prepared and performance tested.

[0074] Comparative Example 2-2

[0075] The preparation steps and parameters are consistent with Example 1-1, except that the weight fraction of corundum powder in the raw materials is 20 parts, and the coating product is prepared and performance tested.

[0076] Comparative Example 2-3

[0077] The preparation steps and parameters are consistent with Example 1-1, except that the weight fraction of corundum powder in the raw materials is 24 parts, and the coating product is prepared and performance tested.

[0078] Comparative Example 3

[0079] The preparation steps and parameters are consistent with Example 1-1, except that no corundum powder pre-dispersion is added to the raw materials, and other steps are adjusted accordingly, and the coating product is prepared and performance tested.

[0080] Comparative Example 4

[0081] The preparation steps and parameters are consistent with Example 1-1, except that quartz powder is used instead of corundum powder in the raw materials, and the coating product is prepared and performance tested.

[0082] Comparative Example 5

[0083] The preparation steps and parameters are consistent with Example 1-1, except that the weight fraction of light-cured resin in the raw materials is 100 parts, and the coating product is prepared and performance tested.

[0084] Example 3

[0085] The raw materials are composed of an elastic resin composition and a corundum powder pre-dispersion, the elastic resin composition is composed of 80 parts of a heat-cured resin, 4 parts of a hyperbranched resin, and 216 parts of a diluent, the corundum powder pre-dispersion is composed of 12 parts of corundum powder, 12 parts of a hyperbranched resin, and 56 parts of propylene glycol methyl ether, the weight fraction of the elastic resin composition is 300 parts, 80 parts of the corundum powder pre-dispersion is added, and the corundum powder passes through a 1000-mesh sieve.

[0086] Specifically, the heat-cured resin is bisphenol A epoxy acrylate, the curing agent is an amino-terminated hyperbranched polyamide, the diluent is propylene glycol methyl ether, and the hyperbranched resin is a carboxyl-terminated hyperbranched polyester or a hydroxyl-terminated hyperbranched polyester. The above materials are commercially available.

[0087] The preparation steps are: (1) first dissolve the hyperbranched resin in propylene glycol methyl ether, add corundum powder, and stir for 60 min with a dispersant to obtain a corundum powder pre-dispersion; (2) add the corundum powder pre-dispersion, bisphenol A epoxy acrylate, curing agent, and diluent in proportion, stir for 10-20 min with a dispersing machine, apply to the surface of the ceramic tile by spraying, and place in an oven at 220°C for 30 min.

[0088] The coating finished product is prepared and performance testing is performed.

[0089] Example 4

[0090] By adjusting the particle size ratio of corundum powder, when the particle size grading of corundum powder in the raw materials is 800 mesh (-) -3000 mesh (+): 3000 mesh (-) -5000 mesh (+): 5000 mesh (-) -8000 mesh (+): 8000 mesh (-) is 4:7:3:1, the wear resistance can be improved to level 4 1500 revolutions. Under this ideal ratio, the high rebound coating on the ceramic tile can also have good protective effect as low as 0.2 mm. The coating formed by the coating without optimizing the particle size ratio of corundum powder has a wear-resistant coating thickness of ≥0.3 mm, and more preferably 0.5-0.8 mm.

[0091] The particle size ratio of Example 1-1 is given.

[0092] Example 5

[0093] The preparation steps and parameters are consistent with Example 1-1, the difference is that corundum powder is directly added to the raw materials, and the pre-dispersion of corundum powder is not used for dispersion, and other steps are adaptively adjusted, the coating finished product is prepared and performance testing is performed.

[0094] Example 6

[0095] The preparation steps and parameters are consistent with Example 1-1, the difference is that 20 parts of water-resistant photocuring oligomer are added to the raw materials, and the water-resistant photocuring oligomer is a mixture of LuCure8531 and BRT6202 in a weight ratio of 2:1.

[0096] The results obtained are as follows:

[0097]

[0098]

[0099] From the above data, it can be seen that:

[0100] (1) The high resilience coatings formed in Examples 1-1 to 1-4 (photocuring examples) and Example 3 (thermal curing example) have good wear resistance, good transparency, and the glaze texture pattern can be clearly observed under light. The elasticity of the coating in Example 3 (thermal curing example) is better, and the wear resistance is better. After the PCT aging test, the coating does not fall off when subjected to hot water flushing, and the surface of the coating is slightly yellow.

[0101] When the raw materials for preparing the high resilience coating include corundum powder and an elastic resin composition, the particle size of the corundum powder is < 150 microns, the weight ratio of the elastic resin composition to the corundum powder is 100:2-5, and the corundum powder is prepared into a corundum powder pre-dispersion liquid, the corundum powder pre-dispersion liquid includes 8-12 parts by weight of corundum powder, 8-12 parts by weight of a dispersing agent, and 48-64 parts by weight of an active diluent, and the elastic resin composition includes 20-40 parts by weight of a photocuring resin, 4-20 parts by weight of a photoinitiator, and 252-296 parts by weight of an active diluent, the formed layer has good transparency and improved wear resistance.

[0102] In Example 1-1, the wear resistance reaches level 3 at 750 rpm. After the wear tests at level 3 at 750 rpm and level 1 at 1500 rpm, the coating surface is observed under a microscope at 200 times magnification. Figure 1 Figure 2 , Figure 1 It can be seen that only a few locations on the coating surface have slight damage, and there are no obvious wear marks within the elastic limit. Figure 2 In Figure 4, the wear resistance is level 4 at 1500 rpm, which exceeds the elastic limit. The coating surface is almost worn out, and only a few complete coating water lines remain.

[0103] (2) Comparing Example 1-1 with Comparative Examples 1, 3, 4, and 5, and Comparative Examples 2-1 to 2-3, it can be seen that:

[0104] When Comparative Examples 1, 3, and 4 are applied to ceramic tiles, the wear resistance decreases to level 2 at 600 rpm, and the wear resistance is general. This indicates that using ordinary photocuring resin, replacing corundum powder with rigid particles with lower Mohs hardness, or using corundum powder with a particle size that is too large, cannot significantly improve the wear resistance of the coating on ceramic tiles. In Comparative Example 5, the weight fraction of the photocuring resin is too large, which affects the curing effect and makes it impossible to successfully cure.

[0105] In Comparative Examples 2-1 to 2-3, the transparency decreases, and the coating surface is generally whitish and hazy, making it impossible to clearly observe the glaze texture pattern on the ceramic tiles. This indicates that when the weight fraction of corundum powder is too large, sedimentation occurs, which reduces the transparency.

[0106] The above comparative examples show that the corundum powder needs to be in a suitable particle size and weight fraction range, so as to have better transparency and better wear resistance, and the weight fraction of the photocurable resin also needs to be controlled in a reasonable range, so as to have a better curing effect.

[0107] (3) Comparing Example 4 with Example 1-1, it can be seen that when the particle grading of the corundum powder is 800 mesh (-) - 3000 mesh (+) : 3000 mesh (-) - 5000 mesh (+) : 5000 mesh (-) - 8000 mesh (+) : 8000 mesh (-) is 4:7:3:1, the wear resistance of the coating is significantly improved.

[0108] (4) Comparing Example 5, 6 with Example 1-1, it can be seen that when the corundum powder is used instead of the corundum powder pre-dispersion liquid (Example 5), the transparency decreases, and the ceramic tile surface coating appears local whitening and haze; when the water-resistant photocurable oligomer-LuCure8531:BRT6202=2:1 is added (Example 6), the adhesion is obviously improved, and after the PCT aging test, the coating does not fall off when subjected to hot water flushing.

[0109] In the preferred range of the elastic resin composition including 20-40 parts of photocurable resin, 4-20 parts of photoinitiator and 252-296 parts of active diluent, 20-40 parts of water-resistant photocurable oligomer is added, and the active diluent in the elastic resin composition is further preferably 252-274 parts, after the scene test, the prepared ceramic tile can be applied in the environment of long-time hot water flushing, such as shower room, the hot water flushing temperature is between 40-65℃, and the water pressure is usually below 0.45Mpa.

[0110] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made according to the content of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A high-rebound coating characterized in that, The raw materials for preparing the high resilience coating include corundum powder and an elastic resin composition, the particle size of the corundum powder is < 150 microns, and the weight ratio of the elastic resin composition to the corundum powder is 100:2-5; The corundum powder is prepared into a pre-dispersion liquid, and the pre-dispersion liquid includes, in terms of weight fraction, 8-12 parts of the corundum powder, 8-12 parts of a dispersant, and 48-64 parts of an active diluent; The elastic resin composition includes, in terms of weight fraction, 20-40 parts of a photocuring resin, 4-20 parts of a photoinitiator, and 252-296 parts of the active diluent; The particle size grading of the corundum powder is < 1.875 microns: 1.875-3 microns: 3-5 microns: 5 microns-18.75 microns = 1:3:7:4 in terms of weight ratio.

2. The high-rebound paint of claim 1, wherein The elastic resin composition further includes, in terms of weight fraction, 20-40 parts of a water-resistant photocuring oligomer, and the active diluent in the elastic resin composition is 252-274 parts.

3. The high-rebound paint of claim 2, wherein, The water-resistant photocuring oligomer is one or more of trimethylolpropane triacrylate, decapolyurethane acrylate, or polyurethane acrylate.

4. The high-rebound paint of claim 1, wherein The photocuring resin uses one or more of HDDA, PDDA, propoxylated 1,6-hexanediol diacrylate, or dimethylaminoethyl acrylate; The active diluent uses one or more of morpholine acrylate, isobutyl methyl acrylate, or dimethylaminoethyl methacrylate; The photoinitiator uses one or more of TPO or 183; The dispersant uses PX4310.

5. Process for the preparation of a high-rebound coating, characterized in that, All components in the raw materials of the high resilience coating are uniformly stirred and dispersed to prepare the high resilience coating.

6. The method for preparing the high resilience coating as described in claim 5, characterized in that, The corundum powder is prepared into a corundum powder pre-dispersion liquid, and the preparation steps include: S1. The corundum powder, the dispersant, and the active diluent in the raw materials of the corundum powder pre-dispersion liquid are uniformly stirred and dispersed to obtain a slurry; S2. The slurry obtained in step S1 is ground and dispersed, and then passed through a 100-mesh sieve; S3. The slurry obtained by sieving in step S2 is continuously stirred and dispersed-ground and dispersed and cycled through the above steps until the corundum powder is suspended and dispersed in the slurry to obtain the corundum powder pre-dispersion liquid.

7. A high-rebound coating characterized by, The high resilience coating is formed by coating and curing the high resilience coating according to any one of claims 1-4.

8. A ceramic tile, characterized by, At least the surface of the ceramic tile is attached with the high resilience coating according to claim 7.

Images