A PMT solvent-free heavy-duty self-leveling mortar and a preparation method thereof

Abstract

The application discloses a PMT solvent-free heavy-load self-leveling mortar and a preparation method thereof, and belongs to the floor coating field. The PMT solvent-free heavy-load self-leveling mortar comprises components A, B and C. The component A is a modified epoxy resin base material, which comprises a low-viscosity organic-inorganic hybrid modified epoxy resin and an additive. The component B is a curing agent of the component A. The mass ratio of the component B to the component A is 0.4-0.6:1. The component C is an aggregate mixture, which comprises a nano-enhanced filler. The mass ratio of the component C to the component A is 3-5:1. The application is based on a modified resin system and combined with a modified nano-enhanced filler to form a dense, fast-curing, surface-smooth, high-flow self-leveling intermediate coating mortar. The strength of the mortar meets the use requirements of a conventional intermediate coating, and the mortar also has the effects of fast curing and surface smoothing.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of floor painting, and relates to a PMT solvent-free heavy-load self-leveling mortar and a preparation method thereof. BACKGROUND

[0002] The floor is suitable for places with high requirements for sanitary conditions, such as hospital floors, food factory workshop floors, pharmaceutical factory workshop floors, laboratory building floors, computer room floors and the like; and is required to be resistant to impact, corrosion and wear, such as underground parking lots, factory warehouses (over forklift areas) and the like.

[0003] The epoxy floor construction is a floor painting process formed by taking epoxy resin as a main material, combining curing agents, diluents and the like auxiliary materials, and belongs to the technical field of building floor construction; the epoxy floor construction has the functions of acid and alkali resistance, water and dust resistance, anti-static and the like by forming a high-strength, wear-resistant decorative floor through multiple coating such as base coating, intermediate coating and top coating. The intermediate coating of the existing epoxy floor mainly comprises epoxy resin, a curing agent and quartz sand, and is mainly used for increasing the thickness and strength of the entire coating, and has a good effect of strength enhancement, but has the defects of poor leveling, long curing time, long construction period and rough surface. SUMMARY

[0004] The application aims to provide a PMT solvent-free heavy-load self-leveling mortar and a preparation method thereof, and solve the problems of poor leveling, long curing time and rough surface in the intermediate coating of the existing epoxy floor.

[0005] The technical scheme adopted by the application is as follows:

[0006] A PMT solvent-free heavy-load self-leveling mortar comprises components A, B and C.

[0007] The component A is a modified epoxy resin base material, and comprises low-viscosity organic-inorganic hybrid modified epoxy resin and an additive.

[0008] The component B is a curing agent of the component A; and the mass ratio of the component B to the component A is 0.4-0.6:1.

[0009] The component C is an aggregate mixture, and comprises nano-enhanced fillers; and the mass ratio of the component C to the component A is 3-5:1.

[0010] Further, the low-viscosity organic-inorganic hybrid modified epoxy resin comprises a methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system, a bisphenol A type epoxy resin and an alkali catalyst.

[0011] The components A, B and C are prepared by the following method:

[0012] A, the cationic polyacrylamide embedded modified calcium carbonate is dispersed in N, N-dimethylformamide, mixed uniformly to obtain a dispersion liquid, methoxy PEG dendritic carboxyl solution is slowly added in the dispersion liquid, after stirring uniformly, 2% of dicyclohexyl carbodiimide and 1% of 4-dimethylaminopyridine of the total mass of the whole reaction system are added, heating reaction is carried out, and a methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is obtained;

[0013] B, the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is reacted with bisphenol A type epoxy resin under an alkali catalyst to obtain a low-viscosity organic-inorganic hybrid modified epoxy resin.

[0014] In the application, PMT is the code of the solvent-free heavy-load self-leveling mortar of the application, which represents an epoxy self-leveling mortar that can simultaneously have the functions of primer, intermediate coating, surface protection, filling and leveling, and is mainly used for the intermediate coating of an epoxy floor, seamlessly connecting the base layer and the surface layer.

[0015] Further, the component B includes isophorone diamine and 2-ethyl-4-methyl imidazole, and the mass ratio of isophorone diamine to 2-ethyl-4-methyl imidazole is 2:1.

[0016] Further, the nano-enhanced filler in the component C includes the following components in weight percentage: 50-60 parts of amine-terminated hyperbranched polymer modified nano SiO2 / Al2O3 composite particles, 20-25 parts of fluorosilane modified nanosilica, and 10-15 parts of stearic acid modified nanosilica.

[0017] Further, the component A includes 70-85 parts by weight of the low-viscosity organic-inorganic hybrid modified epoxy resin.

[0018] The auxiliary agent in the component A includes the following components in weight percentage: 0.6-0.8 parts of a colorant, 0.1-0.4 parts of an antifoaming agent, 0.3-0.7 parts of a dispersing agent, 8-12 parts of an active diluent, 0.1-0.3 parts of a leveling agent, and 0.1-0.8 parts of a thixotropic agent.

[0019] Further, the colorant includes a nanosilicon colorant; the antifoaming agent includes an organic silicon antifoaming agent; the dispersing agent includes a non-ionic dispersing agent; the active diluent includes C12-14 alkyl glycidyl ether; the leveling agent includes an organic silicon leveling agent; and the thixotropic agent includes thixotropic agent EP-7280.

[0020] Further, the mass ratio of the cationic polyacrylamide modified calcium carbonate to the methoxy PEG dendritic carboxyl is 3:6-7.

[0021] Further, the amount of the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is 25-27% of the mass of the bisphenol A type epoxy resin.

[0022] Further, the base catalyst is triethylamine, and the amount is 0.5-1% of the total mass of the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system and the bisphenol A type epoxy resin.

[0023] A preparation method of a PMT solvent-free heavy-load self-leveling mortar, comprising the following steps:

[0024] S1, components A and B are poured into a clean container, and low-speed stirring is performed until a uniform slurry is obtained;

[0025] S2, component C is added to the slurry in batches, and stirring is continuously performed for 1-2 minutes to obtain a mixture;

[0026] S3, the mixture is transferred to another container, and stirring is performed again for 30 seconds to obtain the PMT solvent-free heavy-load self-leveling mortar.

[0027] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present application are:

[0028] 1. A PMT solvent-free heavy-load self-leveling mortar is based on a modified resin system, combined with modified nano-enhanced fillers, to form a dense, fast-curing, smooth-surfaced, and high-flow self-leveling mid-coat mortar, which meets the strength requirements of conventional mid-coat applications, and also has the effects of fast curing and smooth surface;

[0029] 2. The organic-inorganic hybrid system in the present application uses methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate as the main substance to form a viscosity balance mechanism, adjust the viscosity and flow of the resin, and make it meet the use requirements of self-leveling;

[0030] 3. The component C of the present application comprises end-amine hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles, the end-amine hyperbranched polymer is protonated under the local alkaline condition provided by the curing agent to convert into a quaternary ammonium salt ion with a positive charge, which is electrostatically adsorbed with the carboxyl group in the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system, and is electrostatically repelled with the cationic polyacrylamide modified calcium carbonate, so that the modified nano-SiO2 / Al2O3 composite particles and the cationic polyacrylamide modified calcium carbonate are uniformly distributed in the cationic polyacrylamide modified calcium carbonate and cannot be stacked disorderly; the charge adsorption between the methoxy PEG dendritic carboxyl and the modified nano-SiO2 / Al2O3 composite particles realizes the anchoring of the modified nano-SiO2 / Al2O3 composite particles in the resin matrix, and in combination with the filling of other particles, a dense coating can be formed;

[0031] 4. The present application utilizes the synergistic effect among the three main modified fillers to ensure the uniform dispersion of the aggregate in the resin matrix to form a dense coating under the condition of high aggregate addition, and utilizes the modification performance and rheological synergistic mechanism of the three fillers to not significantly hinder the flow of self-leveling under the condition of high aggregate addition, so that the overall self-leveling can maintain a high flow speed and improve the construction efficiency;

[0032] 5. The fluorosilane modified nano-silica and the stearic acid modified nano-silica in the present application not only can improve the hydrophobicity of the coating, but also have high flowability and dispersibility, which can not only fill the obvious gap between the end-amine hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles and the cationic polyacrylamide modified calcium carbonate due to the charge repulsion, but also can fill the gaps in the base layer by using the nano-filling function, thereby playing the roles of dense coating and filling the base layer. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings, wherein:

[0034] Figures 1-3 is a detection report figure of a PMT solvent-free heavy-load self-leveling mortar of the present application;

[0035] Figure 4 is a real object figure of the present application. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, that is, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] It should be noted that the relational terms such as "first" and "second" and the like are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0039] The features and performances of the present application will be further described in detail below in combination with the embodiments.

[0040] The PMT solvent-free heavy-load self-leveling mortar provided by the embodiments of the present application comprises component A, component B and component C.

[0041] The component A is a modified epoxy resin base material, which comprises a low-viscosity organic-inorganic hybrid modified epoxy resin and an additive.

[0042] The component B is a curing agent of the component A; the mass ratio of the component B to the component A is 0.4-0.6:1.

[0043] The component C is an aggregate mixture, which comprises a nano-enhanced filler; the mass ratio of the component C to the component A is 3-5:1.

[0044] The low-viscosity organic-inorganic hybrid modified epoxy resin comprises a methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system, a bisphenol A type epoxy resin and an alkali catalyst, and is prepared by the following method:

[0045] A, the cationic polyacrylamide-embedded modified calcium carbonate is dispersed in N, N-dimethylformamide to obtain a dispersion liquid, a methoxy PEG dendritic carboxyl solution is slowly added into the dispersion liquid, and after stirring uniformly, 2% of dicyclohexyl carbodiimide and 1% of 4-dimethylaminopyridine of the total mass of the reaction system are added, and heating reaction is performed to obtain a methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system;

[0046] B, the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is reacted with bisphenol A type epoxy resin under an alkali catalyst to obtain a low-viscosity organic-inorganic hybrid modified epoxy resin.

[0047] The component B includes isophorone diamine and 2-ethyl-4-methyl imidazole, and the mass ratio of isophorone diamine to 2-ethyl-4-methyl imidazole is 2:1.

[0048] The nano-enhancing filler in the component C includes the following components in parts by weight: 50-60 parts of amine-terminated hyperbranched polymer modified nano SiO2 / Al2O3 composite particles, 20-25 parts of fluorosilane modified nano silicon dioxide, and 10-15 parts of stearic acid modified nano silicon dioxide. The amine-terminated hyperbranched polymer modified nano SiO2 / Al2O3 composite particles are surface modified by adsorption of amine-terminated hyperbranched polymers on nano SiO2 / Al2O3 composite particles, and the fluorosilane modified nano silicon dioxide and the stearic acid modified nano silicon dioxide are both according to the prior art.

[0049] The component A includes 70-85 parts by weight of low-viscosity organic-inorganic hybrid modified epoxy resin.

[0050] The auxiliary agent in the component A includes the following components in parts by weight: 0.6-0.8 parts of colorant, 0.1-0.4 parts of defoaming agent, 0.3-0.7 parts of dispersing agent, 8-12 parts of active diluent, 0.1-0.3 parts of leveling agent, and 0.1-0.8 parts of thixotropic agent.

[0051] The colorant includes nano silicon colorant; the defoaming agent includes organosilicon defoaming agent; the dispersing agent includes non-ionic dispersing agent; the active diluent includes C12-14 alkyl glycidyl ether; the leveling agent includes organosilicon leveling agent; and the thixotropic agent includes thixotropic agent EP-7280.

[0052] The mass ratio of the cationic polyacrylamide modified calcium carbonate to the methoxy PEG dendritic carboxyl is 3:6-7.

[0053] The amount of the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is 25-27% of the mass of the bisphenol A type epoxy resin.

[0054] The base catalyst is triethylamine, and the amount is 0.5-1% of the total mass of the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system and the bisphenol A type epoxy resin.

[0055] The preparation method of the PMT solvent-free heavy-load self-leveling mortar comprises the following steps:

[0056] S1, pour components A and B into a clean container and stir at low speed until a uniform slurry is obtained;

[0057] S2, add component C to the slurry in batches, continue to stir for 1-2 minutes, and obtain a mixture;

[0058] S3, transfer the mixture to another container, stir again for 30 seconds, and obtain the PMT solvent-free heavy-load self-leveling mortar.

[0059] Examples 1-9:

[0060] Examples 1-9 provide a PMT solvent-free heavy-load self-leveling mortar, and the preparation method comprises the following steps:

[0061] S1, pour components A and B into a clean container and stir at low speed until a uniform slurry is obtained;

[0062] S2, add component C to the slurry in batches, continue to stir for 1-2 minutes, and obtain a mixture;

[0063] S3, transfer the mixture to another container, stir again for 30 seconds, and obtain the PMT solvent-free heavy-load self-leveling mortar.

[0064] The component A comprises 80 parts by weight of low viscosity organic-inorganic hybrid modified epoxy resin, 0.7 parts of colorant, 0.3 parts of defoaming agent, 0.6 parts of dispersing agent, 10 parts of active diluent, 0.2 parts of leveling agent, and 0.5 parts of thixotropic agent; the low viscosity organic-inorganic hybrid modified epoxy resin comprises methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system, bisphenol A type epoxy resin, and base catalyst; the mass ratio of cationic polyacrylamide modified calcium carbonate to methoxy PEG dendritic carboxyl in the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is 3:7; the addition amount of the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system is 26% of the mass of the bisphenol A type epoxy resin; and the base catalyst is triethylamine, and the addition amount is 0.8% of the total mass of the methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system and the bisphenol A type epoxy resin.

[0065] The component B comprises isophorone diamine and 2-ethyl-4-methyl imidazole, and the mass ratio of isophorone diamine to 2-ethyl-4-methyl imidazole is 2:1.

[0066] The component C comprises the following components in parts by weight: 55 parts of amine-terminated hyperbranched polymer modified nano SiO2 / Al2O3 composite particles, 25 parts of fluorosilane modified nanosilica, and 12 parts of stearic acid modified nanosilica.

[0067] Based on the same content, the different points of the embodiment 1-X are that the addition amounts of the component B and the component C relative to the component A are different, and the specific formula is shown in Table 1, and the remaining parts are consistent.

[0068] Table 1: The component B, the component C, and the component A in the embodiment 1-embodiment 9

[0069] Mass ratio of component B to component A Mass ratio of component C to component A Example 1 0.4：1 3：1 Example 2 0.4：1 4：1 Example 3 0.4：1 5：1 Example 4 0.5：1 3：1 Example 5 0.5：1 4：1 Example 6 0.5：1 5：1 Example 7 0.6：1 3：1 Example 8 0.6：1 4：1 Example 9 0.6：1 5：1

[0070] Embodiments 10-13:

[0071] The embodiments 10-13 are based on the embodiment 5, the component A has different component proportions, and the remaining parts are consistent, and the component A of different embodiments is shown in Table 2.

[0072] Table 2: The component A in the embodiment 10-embodiment 13

[0073] Mass ratio of each component of component A Example 5 80 parts by weight of low viscosity organic-inorganic hybrid modified epoxy resin + 0.7 parts of colorant + 0.3 parts of defoaming agent + 0.6 parts of dispersing agent + 10 parts of active diluent + 0.2 parts of leveling agent + 0.5 parts of thixotropic agent Example 11 70 parts by weight of low viscosity organic-inorganic hybrid modified epoxy resin + 0.6 parts of colorant + 0.1 parts of defoaming agent + 0.3 parts of dispersing agent + 8 parts of active diluent + 0.1 parts of leveling agent + 0.1 parts of thixotropic agent Example 12 78 parts by weight of low viscosity organic-inorganic hybrid modified epoxy resin + 0.7 parts of colorant + 0.3 parts of defoaming agent + 0.5 parts of dispersing agent + 10 parts of active diluent + 0.2 parts of leveling agent + 0.4 parts of thixotropic agent Example 13 85 parts by weight of low viscosity organic-inorganic hybrid modified epoxy resin + 0.8 parts of colorant + 0.4 parts of defoaming agent + 0.7 parts of dispersing agent + 12 parts of active diluent + 0.3 parts of leveling agent + 0.8 parts of thixotropic agent

[0074] Embodiments 14-15:

[0075] Examples 14-15, based on Example 5, the low viscosity organic-inorganic hybrid modified epoxy resin in component A has different component ratio, see Table 3 for the specific ratio.

[0076] Table 3 Component ratio of low viscosity organic-inorganic hybrid modified epoxy resin in Example 14-Example 15

[0077] Dosage of methoxy PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system Dosage of triethylamine Mass ratio of cationic polyacrylamide modified calcium carbonate to methoxy PEG dendritic carboxyl Example 5 26% 0.8% 3：7 Example 14 25% 0.5% 3：6 Example 15 27% 1% 3：7

[0078] Examples 16-18:

[0079] Examples 16-18, based on Example 5, the component ratio of component C is different, the specific ratio of component C is shown in Table 4.

[0080] Table 4 Component ratio of component C in Example 16-Example 18

[0081] Mass ratio of each component of component C Example 5 55 parts of amine-terminated hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles + 25 parts of fluorosilane modified nano-silica + 12 parts of stearic acid modified nano-silica Example 16 50 parts of amine-terminated hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles, 20 parts of fluorosilane modified nano-silica, 10 parts of stearic acid modified nano-silica Example 17 55 parts of amine-terminated hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles, 23 parts of fluorosilane modified nano-silica, 13 parts of stearic acid modified nano-silica Example 18 60 parts of amine-terminated hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles, 25 parts of fluorosilane modified nano-silica, 15 parts of stearic acid modified nano-silica

[0082] Comparative Example 1

[0083] Based on Example 5, the difference between this comparative example and Example 5 is that the epoxy resin in component A of this comparative example is not organically-inorganically hybrid modified, but is a bisphenol A type epoxy resin.

[0084] Comparative Example 2

[0085] Based on Example 5, the difference between this comparative example and Example 5 is that the modified resin in component A of this comparative example does not include methoxy PEG dendritic carboxyl, but includes cationic polyacrylamide modified calcium carbonate, bisphenol A type epoxy resin, and alkaline catalyst.

[0086] Comparative Example 3

[0087] Based on Example 5, the difference between this comparative example and Example 5 is that the modified resin in component A of this comparative example does not include cationic polyacrylamide modified calcium carbonate, but includes methoxy PEG dendritic carboxyl, bisphenol A type epoxy resin, and alkaline catalyst.

[0088] Comparative Example 4

[0089] Based on Example 5, the difference between this comparative example and Example 5 is that the low viscosity organic-inorganic hybrid modified epoxy resin in component A of this comparative example does not include alkaline catalyst.

[0090] Comparative Example 5

[0091] Based on Example 5, the difference between this comparative example and Example 5 is that component B in this comparative example does not include isophorone diamine.

[0092] Comparative Example 6

[0093] Based on Example 5, the present comparative example is different from Example 5 in that component B does not include 2-ethyl-4-methylimidazole.

[0094] Comparative Example 7

[0095] Based on Example 5, the present comparative example is different from Example 5 in that component C is 100-mesh quartz sand.

[0096] Comparative Example 8

[0097] Based on Example 5, the present comparative example is different from Example 5 in that the end-amine hyperbranched polymer modified nano-SiO2 / Al2O3 composite particles are not included in component C.

[0098] Comparative Example 9

[0099] Based on Example 5, the present comparative example is different from Example 5 in that the fluoro-silane modified nano-silica is not included in component C.

[0100] Comparative Example 10

[0101] Based on Example 5, the present comparative example is different from Example 5 in that the stearic acid modified nano-silica is not included in component C.

[0102] Comparative Example 11

[0103] Based on Example 5, the present comparative example is different from Example 5 in that the nano-SiO2 / Al2O3 composite particles are not modified by end-amine hyperbranched polymers in component C.

[0104] Comparative Example 12

[0105] Based on Example 5, the present comparative example is different from Example 5 in that the nano-silica is not modified by fluoro-silane and stearic acid in component C.

[0106] Control Group

[0107] The general formula for the epoxy floor coating (by weight) includes epoxy resin (35%) + curing agent (12%) + quartz sand (50%) + additives (3%), the epoxy resin is E-44 epoxy resin, the commonly used polyether amine curing agent, and the additives mainly include defoaming agent, leveling agent, etc.

[0108] Test Example 1:

[0109] The performance of Examples 1-18, Comparative Examples 1-12, and the control group was tested, the performance test items and the character test standards are shown in Table 5, and the test results are shown in Table 6.

[0110] Table 5 Floor coating performance test items and test standards

[0111] Test items Reference standard Drying time (surface dry) GB / T 1728-1979 (2004) B method Tensile bonding strength GB / T 22374-2018 6.3.9.1 (standard condition) Impact resistance heavy load (1000g steel ball) GB / T 22374-2018 6.3.10 Water resistance (168h) GB / T 22374-2018 6.3.12, GB / T 9274-1988 (2004) Acid resistance (10% H2SO4, 48 h) GB / T 22374-2018 6.3.13.2, GB / T 9274-1988 (2004) Oil resistance (120 # Solvent oil, 72 h GB / T 22374-2018 6.3.13.3, GB / T 9274-(2004 )

[0112] Table 6 Performance test results

[0113] Drying time (surface dry) Tensile bonding strength Impact resistance heavy load (1000 g steel ball) Water resistance (168 h) Acid resistance (10% H2SO4, 48 h) Oil resistance (120 # Solvent oil, 72 h Examples 1-18 ＜8 3.5-3.8 No cracks, no flaking No blistering, no flaking, no discoloration No blistering, no flaking, slight discoloration No blistering, no flaking, no discoloration Comparative Example 1 ＞8 2.3-2.5 Slight cracking, no flaking Blistering, no flaking, no discoloration Blistering, no flaking, slight discoloration Blistering, no flaking, no discoloration Comparative Example 2 ＞8 2.3-2.5 Slight cracking, no flaking No blistering, no flaking, no discoloration Blistering, no flaking, slight discoloration No blistering, no flaking, no discoloration Comparative Example 3 ＜8 2.8-3 Slight cracking, no flaking Blistering, no flaking, no discoloration Blistering, no flaking, slight discoloration Blistering, no flaking, no discoloration Comparative Example 4 ＞8 ＜2 Flaking Blistering Flaking Blistering Comparative Example 5 ＞8 ＜2 Cracking, no flaking Blistering, no flaking, no discoloration Blistering, no flaking, severe discoloration Blistering, no flaking, no discoloration Comparative Example 6 ＞8 ＜2 Cracking, no flaking Blistering, no flaking, no discoloration Blistering, no flaking, severe discoloration Blistering, no flaking, no discoloration Comparative Example 7 ＜8 ＜2 Severe cracking Blistering, no flaking, no discoloration Blistering, no flaking, slight discoloration Blistering, no flaking, no discoloration Comparative Example 8 ＜8 2.8-3 Severe cracking, no flaking No blistering, no flaking, no discoloration Blistering, no flaking, slight discoloration No blistering, no flaking, no discoloration Comparative Example 9 ＜8 3.1-3.2 Slight cracking, no flaking Blistering, no flaking, no discoloration Blistering, no flaking, severe discoloration No blistering, no flaking, no discoloration Comparative Example 10 ＜8 3.1-3.2 Slight cracking, no flaking Blistering, no flaking, no discoloration Blistering, no flaking, slight discoloration No blistering, no flaking, no discoloration Comparative Example 11 ＜8 ＜2 Flaking Blistering Flaking Blistering Comparative Example 12 ＜8 ＜2 Flaking Blistering Flaking Blistering Control ≤8 2.5-2.7 No cracks, no flaking No blistering, no flaking, no discoloration No blistering, no flaking, slight discoloration No blistering, no flaking, no discoloration

[0114] Among them, the comprehensive performance effect of example 5 is the best; the modification performance of the three modified particles in component C seriously affects the particle dispersity in the whole system and the denseness of the system, and the unmodified particles are prone to agglomeration in the whole system, and once the particles are obviously agglomerated, the overall performance of the self-leveling will be reduced. The coating in the example range of the application meets the use standard.

[0115] Test example 2:

[0116] The product (best) prepared by example 5 is sent by the applicant to the National Building Material Test Center of China National Inspection and Test Group Co., Ltd. for performance testing, the information page of the test report is shown in Figure 1 , the test results are shown in Figure 2 , Figure 3 , and the construction physical map is shown in Figure 4 .

[0117] Test example 3:

[0118] The flow degree and the flatness of the coating surface of the self-leveling prepared by examples 1-18, comparative example 7 and the control group are detected; the flow degree detection method is the prior art, and the results are shown in table 7. The flatness of the coating surface is directly visually detected.

[0119] Table 7 Coating flow speed and roughness detection

[0120] Flowability Smoothness Examples 1-18 ≥ 140 mm Smooth, no sanding Comparative Example 7 < 140 mm Rough, sanding required Control < 140 mm Rough, sanding required Figure 1 Figure 2 Figure 3 Figure 4 Flowability Smoothness Examples 1-18 ≥ 140 mm Smooth, no sanding Comparative Example 7 < 140 mm Rough, sanding required Control < 140 mm Rough, sanding required

[0121] The self-leveling prepared by the application has a flow degree of ≥140 mm, millimeter-level flatness without polishing, low VOC / heavy metal, and meets the environmental protection requirements; and can repair cracks and depressions in the thickness of 0.3-2 mm, can be used for old terrace renovation, and in the renovation process, due to the large amount of nano filler, the base leveling, gap filling and the like can be carried out, not only can be used as a seamless transition base surface and a surface layer, but also can replace the primer and the surface layer in some environments (environments with low gloss requirements); 24 hours can be used for walking and surface layer construction (in the case of surface layer construction); 72 hours can be opened for heavy equipment and AGV traffic. The wear resistance (750g / 500r) of the application is <0.03g (GB / T 22374-2018), which can be used for rapid leveling and strengthening of epoxy and diamond old terrace, base surface pretreatment of high-cleanliness environment such as electronics and pharmaceuticals, and base surface protection and wear resistance upgrading of high-frequency use area.

[0122] The above description is only the preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement and improvement made by any person skilled in the art within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A solvent-free, heavy-duty self-leveling mortar (PMT), characterized in that: Includes component A, component B, and component C; Component A is a modified epoxy resin base, comprising 70-85 parts by weight of a low-viscosity organic-inorganic hybrid modified epoxy resin and additives; the additives comprise the following components in parts by weight: 0.6-0.8 parts of colorant, 0.1-0.4 parts of defoamer, 0.3-0.7 parts of dispersant, 8-12 parts of reactive diluent, 0.1-0.3 parts of leveling agent, and 0.1-0.8 parts of thixotropic agent; Component B is a curing agent for component A; component B includes isophorone diamine and 2-ethyl-4-methylimidazole, with a mass ratio of isophorone diamine to 2-ethyl-4-methylimidazole of 2:1; the mass ratio of component B to component A is 0.4-0.6:1; Component C is an aggregate mixture, including nano-reinforcing fillers. Calculated separately, the nano-reinforcing fillers in Component C include the following components in parts by weight: 50-60 parts of amine-terminated hyperbranched polymer-modified nano-SiO2 / Al2O3 composite particles, 20-25 parts of fluorosilane-modified nano-silica, and 10-15 parts of stearic acid-modified nano-silica; the mass ratio of Component C to Component A is 3-5:

1. The low-viscosity organic-inorganic hybrid modified epoxy resin comprises a methoxy-PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system, bisphenol A type epoxy resin, and an alkaline catalyst; and the low-viscosity organic-inorganic hybrid modified epoxy resin is prepared by the following method: A. Calcium carbonate modified with cationic polyacrylamide was dispersed in N,N-dimethylformamide and mixed evenly to obtain a dispersion. A methoxyPEG dendritic carboxyl solution was slowly added to the dispersion and stirred evenly. Then, 2% of the total mass of dicyclohexylcarbodiimide and 1% of 4-dimethylaminopyridine were added to the reaction system and heated to obtain a methoxyPEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system. B. A low-viscosity organic-inorganic hybrid epoxy resin was obtained by reacting a methoxy-PEG dendritic carboxyl-cationic polyacrylamide-modified calcium carbonate organic-inorganic hybrid system with bisphenol A type epoxy resin under an alkaline catalyst.

2. The PMT solvent-free heavy-duty self-leveling mortar according to claim 1, characterized in that: The colorant includes a nano-silica colorant; the defoamer includes an organosilicon defoamer; the dispersant includes a nonionic dispersant; the reactive diluent includes C12-14 alkyl glycidyl ether; the leveling agent includes an organosilicon leveling agent; and the thixotropic agent includes thixotropic agent EP-7280.

3. The PMT solvent-free heavy-duty self-leveling mortar according to claim 1, characterized in that: The mass ratio of the cationic polyacrylamide-modified calcium carbonate to the methoxy PEG dendritic carboxyl groups is 3:6-7.

4. The PMT solvent-free heavy-duty self-leveling mortar according to claim 3, characterized in that: The amount of the methoxy PEG dendritic carboxyl-cationic polyacrylamide-modified calcium carbonate organic-inorganic hybrid system added is 25-27% of the mass of bisphenol A epoxy resin.

5. The PMT solvent-free heavy-duty self-leveling mortar according to claim 1, characterized in that: The alkaline catalyst is triethylamine, and the amount added is 0.5-1% of the total mass of the methoxy-PEG dendritic carboxyl-cationic polyacrylamide modified calcium carbonate organic-inorganic hybrid system and bisphenol A epoxy resin.

6. A method for preparing a solvent-free, heavy-duty self-leveling mortar (PMT) according to any one of claims 1-5, characterized in that: Includes the following steps: S1. Pour component A and component B into a clean container and stir at low speed until a uniform slurry is obtained. S2. Add component C to the slurry in batches and stir continuously for 1-2 minutes to obtain a mixture; S3. Transfer the mixture to another container and stir again for 30 seconds to obtain PMT solvent-free heavy-duty self-leveling mortar.

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