Method for preparing epoxy floor coating by using artificial agglomerated stone waste slurry and application of epoxy floor coating

Abstract

The invention belongs to the technical field of building materials, and particularly discloses a method for preparing an epoxy floor coating by using artificial agglomerated stone waste slurry and application of the epoxy floor coating. The method for preparing the modified powder from the organic artificial agglomerated stone waste slurry comprises the following steps: mixing, grinding and drying the organic artificial agglomerated stone waste slurry and calcium carbonate sand to obtain powder, and screening the powder to obtain powder with the particle size of 15-18 microns and cumulative distribution of 60-100%, namely the organic artificial agglomerated stone waste slurry modified powder. The organic artificial agglomerated stone waste slurry modified powder prepared by the preparation method disclosed by the invention has good dispersity and anti-settling property when being applied to an epoxy floor coating, the storage time of the coating can be prolonged, and the strength performance of an epoxy floor prepared from the coating can also be improved. The invention also provides an epoxy floor coating, a preparation method thereof and an epoxy floor.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a method for preparing epoxy floor coating by utilizing artificial granite waste slurry and its application. Background Art

[0002] With the continuous development of social economy, the demand for artificial stone has been growing in recent years, and my country has become one of the main producers and consumers of artificial granite. Artificial granite is widely used in many fields such as wall decoration, floor paving, kitchen countertops, bathroom decoration, etc. due to its beautiful, durable and easy processing characteristics. At present, artificial stone is made of marble powder and fragments as the main raw materials, unsaturated polyester resin as adhesive, and is made by stirring, vacuum high-pressure vibration molding, and then room temperature curing. In the process of sawing rough boards, grinding and polishing, a large amount of waste powder and wastewater will be generated, which will be treated by multi-stage sedimentation and filtration to form organic artificial granite waste slurry. If the artificial granite waste slurry is not properly handled, it may cause serious pollution to the environment, including soil pollution, water pollution and air pollution. However, at present, artificial granite manufacturers have limited ways to dispose of organic artificial granite waste slurry, mainly open-air stacking, simple landfill and other methods, and there are few environmentally friendly and effective recycling methods.

[0003] At present, in the related art, there is a method for preparing ceramsite-filled lightweight wallboard to artificial granite waste residue, the ceramsite prepared by artificial granite waste residue is as active filler, with cement, quick-setting agent, natural short fiber, gypsum, water as gelling material and auxiliary materials, through mixing and stirring, autoclaving and other processing preparation novel wall material.Yet the ceramsite prepared by the artificial granite waste residue of the method needs to be formed through granulation, foaming, microwave curing, and the technological process is cumbersome and complicated, because the artificial granite waste residue particle size distribution is inconsistent, reunion occurs easily, the stability of prepared ceramsite is lacking, and the granite waste residue utilization amount has only 40%.There is also a method for using artificial granite waste residue to prepare nano calcium carbonate, by adding dilute hydrochloric acid to react with the artificial granite waste residue, unsaturated resin and other solid impurities that are insoluble in hydrochloric acid are separated, in filtrate, sulfide precipitation agent is added again and iron-based dye in the artificial granite waste residue is precipitated and separated, in filtrate, adopt microemulsion method to control reaction rate to prepare nano calcium carbonate. However, in this method, since the nano calcium carbonate requires a calcium carbonate (dry basis) content of ≥85%, a dilute hydrochloric acid solution is also needed to separate the unsaturated resin in the artificial granite waste residue, so the cost is high and the economic benefit is low.

[0004] Therefore, there is an urgent need to provide a new method for treating artificial granite waste slurry in order to achieve efficient and environmentally friendly utilization of waste materials, prepare high-performance products, improve corporate economic benefits and avoid environmental pollution. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for preparing organic artificial granite waste slurry modified powder. The method for preparing organic artificial granite waste slurry modified powder of the present invention has simple process and high production efficiency, effectively recycles waste powder and waste slurry generated in the production of artificial granite, and the prepared modified powder can be well applied to epoxy floor coatings, so that the prepared coatings have better storage stability and the prepared epoxy floor has better strength performance.

[0006] The invention also provides a filler for epoxy floor coating.

[0007] The invention also provides an epoxy floor coating.

[0008] The invention also provides a method for preparing the epoxy floor coating.

[0009] The invention also provides an epoxy floor.

[0010] The first aspect of the present invention provides a method for preparing organic artificial granite waste slurry modified powder, comprising the following steps:

[0011] Organic artificial granite waste slurry and calcium carbonate sand are mixed, ground and dried to obtain powder, and the powder is screened to obtain powder with a cumulative distribution of 60% to 100% of particle size between 15 and 18 μm, thus obtaining organic artificial granite waste slurry modified powder.

[0012] According to a specific embodiment of the present invention, the method for preparing organic artificial granite waste slurry modified powder provided by the present invention has at least the following beneficial effects:

[0013] The treatment method of the present invention integrates the grinding and drying of waste slurry, avoids the high-energy consumption drying treatment step of organic artificial granite waste slurry in the traditional recycling process, simplifies the process flow, improves production efficiency, reduces energy consumption, and is conducive to green and low-carbon development.

[0014] The present invention can optimize the particle size of artificial granite waste slurry and deagglomerate the waste slurry by co-grinding the waste slurry with calcium carbonate sand, thereby solving the problems of agglomeration and poor stability of the artificial granite waste slurry; the modified powder of organic artificial granite waste slurry obtained after the co-grinding can achieve excellent dispersibility; and further, by adjusting the particle size distribution of the modified powder of organic artificial granite waste slurry, the problem of inconsistent particle size distribution of organic artificial granite waste slurry can be solved.

[0015] The artificial granite waste slurry modified powder prepared by the present invention has good dispersibility and anti-settling properties, can prolong the storage time of the coating, can make the epoxy floor coating not need to add additional anti-settling additives, and can also improve the strength performance of the epoxy floor prepared by the epoxy floor coating.

[0016] The modified powder of organic artificial granite waste slurry prepared by the method of the present invention can replace natural calcium powder and be applied in the production of epoxy floor coatings, thereby reducing the mining of natural minerals as non-renewable resources; it can also realize the industrial recycling of organic artificial granite waste slurry, realize the economical utilization of organic artificial granite waste slurry, and effectively solve the problems of polluting the environment and occupying land resources due to open-air stacking of organic artificial granite waste slurry.

[0017] According to some embodiments of the present invention, after screening the powder, a powder having a cumulative distribution of 80% to 100% of particle sizes between 15 and 18 μm is obtained.

[0018] According to some embodiments of the present invention, the grinding and drying steps are performed by using a vertical mill to perform grinding and drying processes.

[0019] According to some embodiments of the present invention, the screening of the powder is performed by using a powder classifier.

[0020] According to some embodiments of the present invention, the water content of the organic artificial granite waste slurry is ≤20wt%.

[0021] According to some embodiments of the present invention, the water content of the organic artificial granite waste slurry is 10 wt % to 20 wt %.

[0022] Organic artificial granite waste slurry usually contains 25%-50% moisture. The traditional method of treating organic artificial granite waste slurry requires drying it to obtain waste powder or waste residue, and then using a modifier to treat it. This process requires a lot of energy consumption. The method of the present invention only needs to control the moisture content of organic artificial granite waste slurry to less than 20%, which can be simply obtained by natural drying and other methods. Organic artificial granite waste slurry with lower moisture content is synergistically ground with calcium carbonate sand in a vertical mill to achieve integrated grinding and drying, which simplifies the process flow, reduces energy consumption, and can prepare organic artificial granite waste slurry modified powder with good dispersibility.

[0023] According to some embodiments of the present invention, the weight ratio of the organic artificial granite waste slurry to the calcium carbonate sand is 3 to 6:1.

[0024] In addition to exploring the coordinated grinding treatment of calcium carbonate sand and organic artificial granite waste slurry, the present invention also explored the optimal coordinated grinding treatment ratio of the two raw materials, and found that the modified powder of organic artificial granite waste slurry prepared within the raw material dosage ratio range has lower viscosity and storage stability when used to prepare epoxy floor coatings, thereby being able to prepare epoxy floors with better strength performance.

[0025] According to some embodiments of the present invention, the weight ratio of the organic artificial granite waste slurry to the calcium carbonate sand is 3 to 5:1.

[0026] A second aspect of the present invention provides a filler for epoxy floor coatings, wherein the filler comprises modified powder of organic artificial granite waste slurry prepared by the preparation method described in the first aspect of the present invention.

[0027] The use of the modified powder of organic artificial granite waste slurry prepared by the present invention as a filler for epoxy floor coatings can not only make the coatings have good dispersibility and anti-settling properties, but also prolong the storage time of the coatings. The unsaturated polyester resin in the modified powder can also cross-link with the epoxy resin in the epoxy floor coatings, thereby increasing the cross-linking density of the epoxy resin and the strength of the epoxy floor.

[0028] A third aspect of the present invention provides an epoxy floor coating, comprising component A and component B;

[0029] In terms of weight, the raw materials of component A include 20 to 35 parts of epoxy resin, 4 to 10 parts of active diluent, 55 to 80 parts of filler, and 0.1 to 0.5 parts of dispersant;

[0030] The raw materials of component B include 5 to 10 parts of curing agent and 0.1 to 0.5 parts of accelerator;

[0031] Wherein, the filler is selected from the organic artificial granite waste slurry modified powder described in the first aspect of the present invention or the filler described in the second aspect of the present invention.

[0032] According to some embodiments of the present invention, the raw materials of component A include 23 to 30 parts of epoxy resin, 6 to 10 parts of active diluent, 60 to 75 parts of filler, and 0.1 to 0.3 parts of dispersant; the raw materials of component B include 6 to 10 parts of curing agent and 0.1 to 0.3 parts of accelerator.

[0033] According to some embodiments of the present invention, the dispersant is a polymeric hyperdispersant.

[0034] The present invention can better increase the compatibility of artificial granite waste slurry modified powder with epoxy resin and reduce material viscosity by selecting a polymer super dispersant, and can significantly increase the dosage of the modified powder in the epoxy floor paint system to more than 50%, thereby achieving large-scale harmless and high-quality utilization of artificial granite waste slurry.

[0035] According to some embodiments of the present invention, the polymeric hyperdispersant is specifically a polymeric block polymer containing an acidic group.

[0036] According to some embodiments of the present invention, the epoxy value Eq / 100g of the epoxy resin is 0.15 to 0.65.

[0037] According to some embodiments of the present invention, the epoxy value Eq / 100g of the epoxy resin is 0.4 to 0.56.

[0038] According to the property that organic artificial granite waste slurry is coated by unsaturated polyester resin, the unsaturated polyester resin of organic artificial granite waste slurry modified powder can be cross-linked with epoxy resin and curing agent, thereby increasing the cross-linking density of epoxy resin and increasing the strength of epoxy flooring; further, the present invention finds that controlling the epoxy value of epoxy resin helps to improve the encapsulation of epoxy resin and organic artificial granite waste slurry modified powder, further increasing the cross-linking density, and thus improving the strength performance of epoxy flooring.

[0039] According to some embodiments of the present invention, the epoxy value Eq / 100g of the epoxy resin is 0.45 to 0.56.

[0040] According to some embodiments of the present invention, the epoxy resin is a bisphenol A epoxy resin.

[0041] According to some embodiments of the invention, the reactive diluent comprises a glycidyl ether reactive diluent.

[0042] According to some embodiments of the invention, the reactive diluent comprises a diglycidyl ether reactive diluent.

[0043] According to some embodiments of the present invention, the epoxy value Eq / 100g of the glycidyl ether reactive diluent is 0.28 to 0.36.

[0044] According to some embodiments of the invention, the curing agent comprises a phenalkamine curing agent.

[0045] According to some embodiments of the present invention, the phenalkamine curing agent has an amine value of 450 to 560 mgKOH / g and a viscosity of 500 to 1500 mPa*s (25°C).

[0046] According to some embodiments of the present invention, the promoter includes a tertiary amine catalyst promoter having an amine value of 600 to 630 mgKOH / g.

[0047] According to some embodiments of the present invention, the component A further comprises 3 to 10 parts of color paste.

[0048] According to some embodiments of the present invention, the color paste is a resin color paste with a solid content of more than 85%.

[0049] The fourth aspect of the present invention provides a method for preparing the epoxy floor coating according to the third aspect of the present invention, comprising the following steps:

[0050] The raw materials of the component A are mixed to obtain the component A, and the raw materials of the component B are mixed to obtain the component B;

[0051] The component A and the component B are mixed to obtain the epoxy floor coating.

[0052] According to some embodiments of the present invention, the method for mixing to obtain component A is to use a shear disperser for dispersion mixing.

[0053] According to some embodiments of the present invention, the method for mixing to obtain component A is to use a high-speed shear disperser to disperse at a rotation speed of 500 to 1500 r / min for 10 to 40 min.

[0054] In the present invention, since component A contains solid powder material, the high shear force and high-frequency mechanical effect of the high-speed shear disperser are utilized to quickly and evenly disperse the powder in the liquid, which requires a higher rotation speed and a longer dispersion time, and a coating with better dispersibility can be prepared.

[0055] According to some embodiments of the present invention, the method for mixing to obtain component B is to use a stirrer for mixing.

[0056] According to some embodiments of the present invention, the method for mixing to obtain component B is to use a stirrer to stir at a stirring speed of 50 to 200 r / min for 10 to 20 min.

[0057] A fifth aspect of the present invention provides an epoxy floor, wherein the raw materials for preparing the epoxy floor include the epoxy floor coating described in the third aspect of the present invention.

[0058] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0060] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0061] Example 1

[0062] This embodiment provides an organic artificial granite waste slurry modified powder and provides a preparation method thereof.

[0063] The raw materials for preparing the modified powder of organic artificial granite waste slurry in this embodiment are as follows by weight: 800 parts of organic artificial granite waste slurry and 200 parts of calcium carbonate sand;

[0064] The organic artificial granite waste slurry is the organic artificial granite waste slurry with a water content of 18% after natural drying.

[0065] The preparation method of the organic artificial granite waste slurry modified powder of this embodiment is:

[0066] The vertical mill is turned on, the organic artificial granite waste slurry and calcium carbonate sand in the above-mentioned weight proportions are mixed, poured into the hopper, and enter the mill through the hopper conveyor belt. The materials are ground, dispersed and dried inside the mill, and then the modified powder is screened by the powder selector, so that the cumulative distribution of the modified waste powder in the particle size range of 15 to 18 μm is 85%, and finally the organic artificial granite waste slurry modified powder is collected at the discharge port.

[0067] Example 2

[0068] This embodiment provides a solvent-free epoxy floor coating prepared using modified powder of organic artificial granite waste slurry, and provides a preparation method thereof.

[0069] The epoxy floor coating of this embodiment contains component A and component B, wherein the raw materials for preparing component A are calculated by weight: 27 parts of bisphenol A epoxy resin, 8 parts of glycidyl ether active diluent, 65 parts of organic artificial granite waste slurry modified powder prepared in Example 1, 0.2 parts of polymer type super dispersant, and 5 parts of iron green slurry; the raw materials for preparing component B are calculated by weight: 8 parts of phenolic amine curing agent and 0.2 parts of DMP30 accelerator;

[0070] Among them, the bisphenol A type epoxy resin is an epoxy resin with the brand name YD-128 purchased from Guodu Chemical (Kunshan) Co., Ltd., and the epoxy value Eq / 100g is 0.52-0.54; the glycidyl ether active diluent is polypropylene glycol diglycidyl ether with the brand name 702A purchased from Guangzhou Kailvwei Chemical Co., Ltd., and the epoxy value Eq / 100g is 0.28-0.36; the polymer type super dispersant is a dispersant with the brand name SU266 purchased from Guangzhou Zongling New Materials Co., Ltd.; the iron green slurry is purchased from Suzhou Shiming Technology Co., Ltd.; the phenolic amine curing agent is a curing agent with the brand name T31-D purchased from Guangzhou Qian'an Chemical Co., Ltd.; and the DMP30 accelerator is purchased from Jinan Langsheng New Materials Co., Ltd.

[0071] The preparation method of the epoxy floor coating of the present embodiment is as follows:

[0072] 1) Prepare the above-mentioned A component raw materials in parts by weight, add them into a disperser and disperse and mix them evenly at high speed, set the speed to 950r / min and disperse for 35min;

[0073] 2) Prepare the above-mentioned component B raw materials in parts by weight, stir and mix them evenly at a stirring speed of 150 r / min and a stirring time of 15 min;

[0074] 3) Mix components A and B and stir evenly to obtain the epoxy floor coating.

[0075] The present embodiment also provides the step of scraping or flat coating the epoxy floor coating, curing it and completing the curing to obtain the epoxy floor.

[0076] Example 3

[0077] This embodiment provides a solvent-free epoxy floor coating prepared using organic artificial granite waste slurry modified powder, and provides a preparation method thereof. The difference between this embodiment and Example 2 is that 65 parts of organic artificial granite waste slurry modified powder in component A are replaced with 70 parts, and the rest are the same as Example 2.

[0078] Example 4

[0079] This embodiment provides a solvent-free epoxy floor coating prepared using modified powder of organic artificial granite waste slurry, and provides a preparation method thereof. The difference between this comparative example and Example 2 is only that the bisphenol A epoxy resin of component A is replaced with a bisphenol A epoxy resin having an epoxy value Eq / 100g of 0.17-0.19, and the rest is the same as Example 2.

[0080] Example 5

[0081] This embodiment provides a solvent-free epoxy floor coating prepared using modified powder of organic artificial granite waste slurry, and provides a preparation method thereof. The difference between this comparative example and Example 2 is that the bisphenol A epoxy resin of component A is replaced with a bisphenol A epoxy resin having an epoxy value Eq / 100g of 0.57-0.60, and the rest is the same as Example 2.

[0082] Comparative Example 1

[0083] This comparative example provides an organic artificial granite waste slurry modified powder and provides a preparation method thereof.

[0084] The raw materials for preparing the modified powder of organic artificial granite waste slurry in this comparative example are as follows by weight: 1000 parts of organic artificial granite waste slurry;

[0085] Among them, the organic artificial granite waste slurry is the same as that in Example 1.

[0086] The preparation method of the organic artificial granite waste slurry modified powder of this comparative example is:

[0087] The vertical mill is turned on, and the organic artificial granite waste slurry of the above-mentioned weight proportion is poured into the hopper, and enters the mill through the hopper conveyor belt. The material is ground, dispersed and dried inside the mill, and then the modified powder is screened by the powder selector, so that the cumulative distribution of the modified waste powder in the particle size range of 15 to 18 μm is 85%, and finally the organic artificial granite waste slurry modified powder is collected at the discharge port.

[0088] Comparative Example 2

[0089] This comparative example provides an organic artificial granite waste slurry modified powder and provides a preparation method thereof.

[0090] The raw materials for preparing the modified powder of organic artificial granite waste slurry in this comparative example are as follows by weight: 800 parts of organic artificial granite waste slurry and 200 parts of calcium carbonate sand;

[0091] Among them, the organic artificial granite waste slurry is the same as that in Example 1.

[0092] The preparation method of the organic artificial granite waste slurry modified powder of this comparative example is:

[0093] The vertical mill is turned on, the organic artificial granite waste slurry and calcium carbonate sand in the above-mentioned weight proportions are mixed, poured into the hopper, and enter the mill through the hopper conveyor belt. The materials are ground, dispersed and dried inside the mill, and then the modified powder is screened by the powder selector to make the cumulative distribution of the modified waste powder in the range of 15 to 18 μm to be 45%, and finally the organic artificial granite waste slurry modified powder is collected at the discharge port.

[0094] Comparative Example 3

[0095] This comparative example provides a solvent-free epoxy floor coating prepared using organic artificial granite waste slurry modified powder, and provides a preparation method thereof. The difference between this comparative example and Example 2 is that 65 parts of organic artificial granite waste slurry modified powder in component A are replaced with 65 parts of natural calcium carbonate powder with the same particle size distribution, and the rest are the same as Example 2.

[0096] Comparative Example 4

[0097] This comparative example provides a solvent-free epoxy floor coating prepared using organic artificial granite waste slurry modified powder, and provides a preparation method thereof. The difference between this comparative example and Example 2 is that 65 parts of organic artificial granite waste slurry modified powder in component A are replaced with 65 parts of organic artificial granite waste slurry modified powder prepared in Comparative Example 1, and the rest are the same as Example 2.

[0098] Comparative Example 5

[0099] This comparative example provides a solvent-free epoxy floor coating prepared using organic artificial granite waste slurry modified powder, and provides a preparation method thereof. The difference between this comparative example and Example 2 is that 65 parts of organic artificial granite waste slurry modified powder in component A are replaced with 65 parts of organic artificial granite waste slurry modified powder prepared in Comparative Example 2, and the rest are the same as Example 2.

[0100] Comparative Example 6

[0101] This comparative example provides an organic artificial granite waste slurry modified powder and provides a preparation method thereof.

[0102] The raw materials for preparing the modified powder of organic artificial granite waste slurry in this comparative example are as follows by weight: 500 parts of organic artificial granite waste slurry and 500 parts of calcium carbonate sand;

[0103] Among them, the organic artificial granite waste slurry is the same as that in Example 1.

[0104] The preparation method of the organic artificial granite waste slurry modified powder of this comparative example is:

[0105] The vertical mill is turned on, the organic artificial granite waste slurry and calcium carbonate sand in the above-mentioned weight proportions are mixed, poured into the hopper, and enter the mill through the hopper conveyor belt. The materials are ground, dispersed and dried inside the mill, and then the modified powder is screened by the powder selector, so that the cumulative distribution of the modified waste powder in the particle size range of 15 to 18 μm is 85%, and finally the organic artificial granite waste slurry modified powder is collected at the discharge port.

[0106] Comparative Example 7

[0107] This comparative example provides a solvent-free epoxy floor coating prepared using organic artificial granite waste slurry modified powder, and provides a preparation method thereof. The difference between this comparative example and Example 2 is that 65 parts of organic artificial granite waste slurry modified powder in component A are replaced with 65 parts of organic artificial granite waste slurry modified powder prepared in Comparative Example 8, and the rest are the same as Example 2.

[0108] Performance Testing:

[0109] According to the detection method in GB / T2794-2022 "Determination of viscosity of adhesives", the viscosity of the solvent-free epoxy floor coatings prepared in Examples 2 to 5 and Comparative Examples 3 to 5 and 7 was tested. According to the detection method and standard in GB / T 6753.3-1986 "Test method for storage stability of coatings", the storage stability test of the solvent-free epoxy floor coatings prepared in Examples 2 to 5 and Comparative Examples 3 to 5 and 7 was tested. According to the detection method and standard in JC / T1015-2006 epoxy resin floor coating materials, the 7d compressive strength and 7d tensile bonding strength tests were performed on the solvent-free epoxy floor coatings prepared in Examples 2 to 5 and Comparative Examples 3 to 5 and 7. The test results are shown in Table 1.

[0110] Table 1 Performance test results of solvent-free epoxy floor coatings

[0111]

[0112] Note:

[0113] GB / T 6753.3-1986 "Test Method for Storage Stability of Coatings" 2.3.4 Evaluation of Sedimentation Degree:

[0114] 10: Completely suspended; no change compared to the original state of the paint.

[0115] 8: There is a noticeable sense of sedimentation and a small amount of deposited pigment appears on the palette knife; there is no obvious resistance when pushing the palette knife with force.

[0116] 6: There are obvious settled pigment lumps. The weight of the spatula can penetrate the pigment lumps and fall to the bottom of the container; there is a certain resistance when the spatula is used to push. The lumps of the condensed part can be transferred to the spatula.

[0117] 4: The spatula cannot fall to the bottom of the container due to its own weight; it is difficult to push the spatula through the paint block with the blade, and there is a slight resistance when pushing the spatula along the edge of the can; but the paint can be easily remixed into a uniform state.

[0118] 2: When the spatula is forced to penetrate the pigment sedimentation layer, it is difficult to push with the spatula surface. There is obvious resistance when pushing the spatula blade along the edge of the can, but the paint can be remixed into a uniform state.

[0119] 0: Formed into very hard lumps; these lumps can no longer be mixed with the liquid to form a uniform paint within 3 to 5 minutes by manual stirring.

[0120] GB / T 6753.3-1986 "Test Method for Storage Stability of Coatings" 2.3.8 Evaluation of Viscosity Change Value:

[0121] 10: Viscosity change value is not more than 5%;

[0122] 8: The viscosity change value is not more than 15%;

[0123] 6: The viscosity change value is not more than 25%;

[0124] 4: The viscosity change value is not more than 35%;

[0125] 2: The viscosity change value is not more than 45%;

[0126] 0: Viscosity change value is greater than 45%.

[0127] From the above test results, it can be seen that the solvent-free epoxy floor coatings prepared using the scheme of the present invention in Examples 2 and 3 have relatively low viscosity, and the viscosity difference between the two is not large, and the viscosity value is much lower than the epoxy floor coatings prepared in Comparative Examples 3 to 5, proving that the organic artificial granite waste slurry modified powder prepared using the scheme of the present invention can achieve low viscosity and high filling effect in epoxy floor coatings. The lower viscosity of the epoxy floor coatings in Examples 2 and 3 can avoid uneven construction and paving due to excessive viscosity, and the problem of additional solvent addition is required, so as to achieve the solvent-free requirement of the whole production and construction process, and the lower viscosity can make the organic artificial granite waste slurry modified powder and epoxy resin fully dispersed and evenly distributed, and the two are better combined, which can effectively improve the crosslinking density and further improve the performance of epoxy floor coatings. In addition, the epoxy floor coating prepared by the scheme of the present invention also has good storage stability. In the storage stability test, the evaluation of the sedimentation degree and the viscosity change value are both the best. After the storage test, the coating is still completely suspended, and there is no change compared with the original state, and the viscosity change value is not more than 5%, achieving excellent storage stability. In addition, the epoxy floor coating prepared by the scheme of the present invention also has good strength performance, and its 7d compressive strength and 7d tensile bonding strength have achieved higher levels, which can meet the preparation of high-performance epoxy floor products and realize high-quality utilization of organic artificial granite waste powder.

[0128] Compared with Example 2, the epoxy values ​​of the bisphenol A epoxy resin used in Example 4 and Example 5 are too low and too high, respectively, which have almost no effect on the viscosity and storage stability of the prepared epoxy floor coating, but will cause a certain degree of decrease in the strength of the epoxy floor. The 7d compressive strength and 7d tensile bonding strength of the epoxy floor prepared in Example 2 are better than those in Example 4 and Example 5. The results show that the epoxy value of the bisphenol A epoxy resin will have a certain degree of influence on the strength of the epoxy floor. The use of bisphenol A epoxy resin with a more suitable epoxy value can produce better encapsulation of artificial granite waste powder, and produce the best cross-linking density with it, thereby achieving better epoxy floor strength performance.

[0129] Compared with Example 2, Comparative Example 3 uses natural calcium carbonate powder instead of the organic artificial granite waste slurry modified powder prepared in Example 1, resulting in a significant decrease in the performance of the epoxy floor coating and epoxy floor prepared therefrom. The viscosity of the epoxy floor coating of Comparative Example 3 is greatly increased, resulting in excessive viscosity and decreased construction performance. Additional solvents are usually required to overcome the defects, thereby increasing material costs and construction complexity; and the epoxy floor coating using natural calcium carbonate powder cannot achieve the same high storage stability as the waste slurry modified powder, and the results of the tests on the degree of sedimentation and the degree of viscosity change are poor; further, the strength of the epoxy floor prepared using the epoxy floor coating of Comparative Example 3 also decreased to varying degrees compared with Example 2.

[0130] Compared with Example 2, Comparative Example 4 uses the organic artificial granite waste slurry modified powder prepared in Comparative Example 1 to replace the organic artificial granite waste slurry modified powder prepared in Example 1. The organic artificial granite waste slurry modified powder in Comparative Example 1 is prepared without adding calcium carbonate sand for coordinated grinding and modification treatment, resulting in a higher viscosity of the epoxy floor coating prepared from the waste slurry modified powder. It is speculated that because only artificial granite waste slurry is used for grinding in Comparative Example 1, the waste powder has poor deagglomeration and dispersibility, resulting in the viscosity and storage stability of the epoxy floor coating prepared therefrom being worse than those in Example 2; in addition, the strength of the epoxy floor prepared by the epoxy floor coating of Comparative Example 4 is also reduced.

[0131] Compared with Example 2, Comparative Example 7 uses the organic artificial granite waste slurry modified powder prepared in Comparative Example 6 to replace the organic artificial granite waste slurry modified powder prepared in Example 1. When the organic artificial granite waste slurry modified powder in Comparative Example 6 is prepared, the weight ratio of the organic artificial granite waste slurry to the calcium carbonate sand is 1:1, which is too small and is not within the range of 3 to 6:1, resulting in a higher viscosity of the epoxy floor coating prepared by the waste slurry modified powder, which results in the viscosity and storage stability of the epoxy floor coating prepared by it being worse than those in Example 2. In addition, the strength of the epoxy floor prepared by the epoxy floor coating of Comparative Example 7 is also reduced.

[0132] Compared with Example 2, Comparative Example 5 uses the organic artificial granite waste slurry modified powder prepared in Comparative Example 2 to replace the organic artificial granite waste slurry modified powder prepared in Example 1. The particle size of the organic artificial granite waste slurry modified powder in Comparative Example 2 is different from the modified powder particle size distribution in Example 2, and the cumulative distribution at 15-18 μm is only 45%, which also leads to poor dispersibility of the modified powder. The storage stability of the epoxy floor coating prepared using the modified powder is significantly deteriorated, and the strength of the prepared epoxy floor is reduced.

[0133] In summary, the modified powder of organic artificial granite waste slurry prepared by the scheme of the present invention can achieve low viscosity and high filling effect in epoxy floor coating. The lower viscosity can avoid uneven construction and paving due to excessive viscosity, and the problem of additional solvent addition is required, so as to achieve the solvent-free requirement of the whole production and construction process. Moreover, the lower viscosity can make the modified powder and epoxy resin fully and evenly dispersed, better combined together, improve the cross-linking density, and optimize the coating strength performance. The present invention solves the problems of agglomeration and inconsistent particle size distribution of organic artificial granite waste slurry by using organic artificial granite waste slurry and calcium carbonate sand for synergistic grinding and controlling the particle size distribution of the modified powder, improves the dispersibility and anti-settling property of the waste powder, makes the prepared epoxy floor coating have high stability, prolongs the storage time of the coating product, does not need to add additional anti-settling aids, and improves the enterprise benefits. In addition, the unsaturated polyester resin contained in the modified powder can be cross-linked with the epoxy resin, improves the cross-linking density of the epoxy resin, and increases the strength of the epoxy floor. The present invention further improves the strength performance of the epoxy floor by controlling the epoxy value of the bisphenol A epoxy resin.

[0134] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for preparing organic artificial granite waste slurry modified powder, characterized in that: The following steps are involved: Organic artificial granite waste slurry and calcium carbonate sand are mixed, ground and dried to obtain powder, and the powder is screened to obtain powder with a cumulative distribution of 60% to 100% of particle size between 15 and 18 μm, thus obtaining organic artificial granite waste slurry modified powder.

2. The preparation method according to claim 1, characterized in that: The water content of the organic artificial granite waste slurry is ≤20wt%.

3. The preparation method according to claim 1, characterized in that: The weight ratio of the organic artificial granite waste slurry to the calcium carbonate sand is 3-6:

1.

4. A filler for epoxy floor coating, characterized in that: The filler comprises organic artificial granite waste slurry modified powder obtained by the preparation method according to any one of claims 1 to 3.

5. An epoxy floor coating, characterized in that: It includes component A and component B; In terms of weight, the raw materials of component A include 20 to 35 parts of epoxy resin, 4 to 10 parts of active diluent, 55 to 80 parts of filler, and 0.1 to 0.5 parts of dispersant; The raw materials of component B include 5 to 10 parts of curing agent and 0.1 to 0.5 parts of accelerator; Wherein, the filler is selected from the organic artificial granite waste slurry modified powder described in any one of claims 1 to 3 or the filler described in claim 4.

6. The epoxy floor coating according to claim 5, characterized in that: The dispersant is a polymer type super dispersant.

7. The epoxy floor coating according to claim 5, characterized in that: The epoxy value Eq / 100g of the epoxy resin is 0.15 to 0.

65.

8. A method for preparing an epoxy floor coating as claimed in any one of claims 5 to 7, characterized in that: The following steps are involved: The raw materials of the component A are mixed to obtain the component A, and the raw materials of the component B are mixed to obtain the component B; The component A and the component B are mixed to obtain the epoxy floor coating.

9. The preparation method according to claim 8, characterized in that: The method for mixing to obtain component A is to use a shear disperser for dispersion mixing; and / or, the method for mixing to obtain component B is to use a stirrer for stirring mixing.

10. An epoxy floor, characterized in that: The raw materials for preparing the epoxy floor include the epoxy floor coating according to any one of claims 5 to 7.

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