Epoxy resin floor paint and preparation method thereof

Abstract

The invention discloses an epoxy resin floor paint and a preparation method thereof, the epoxy resin floor paint comprises the following raw materials by weight: a component A: 100-120 parts of epoxy resin, 15-20 parts of an active diluent, 40-50 parts of modified quartz sand, 30-40 parts of barium sulfate, 2-3 parts of a dispersant, and 0.5-0.8 part of a leveling agent; the component B is prepared from the following components in parts by weight: 30 to 35 parts of diaminodicyclohexyl methane and 0.2 to 0.3 part of a de-foaming agent. According to the epoxy resin floor paint, the epoxy resin, the reactive diluent, the diaminodicyclohexylmethane curing agent and a specific type of auxiliary agent with specific contents are adopted, and the quartz sand subjected to multi-step surface functionalization modification is introduced as a filler; the problems that in the prior art, epoxy floor paint is insufficient in mechanical property (such as impact resistance) and poor in wear resistance, peeling and falling are caused by adhesive force reduction after long-term use and the like are effectively solved, the comprehensive performance of the floor paint is remarkably improved, the service life of the floor paint is prolonged, and the application range of the floor paint is widened.

Description

Technical Field

[0001] The present invention belongs to the technical field of floor paints, and particularly relates to an epoxy resin floor paint and a preparation method thereof. Background Art

[0002] Floor paint was first invented in Germany and is obtained by mixing different substances. It is mainly applied to various working environments such as workshops and factories to achieve the effects of environmental protection and less dust. Due to differences in the use environment, there are different requirements for the types of floor paints. Common types include epoxy resin floor paint, wear-resistant floor paint, antistatic floor paint, and corrosion-resistant floor paint, etc. Among them, epoxy resin floor paint is a high-strength, wear-resistant and beautiful floor paint coating. The main characteristics of epoxy resin paint are high adhesion to the cement base layer, excellent physical properties of the coating film, and can be resistant to water and corrosion. It is suitable for various places such as factories, warehouses, parking lots, repair shops, and shopping mall floors, etc., with a very wide range of uses and low prices.

[0003] At present, floor paints are being used more and more widely, but most floor paints on the market still have some problems. For example, they have poor impact resistance, poor wear resistance, and insufficient adhesion, which easily lead to problems such as blistering, biting the bottom, cracking, peeling or flaking after long-term use. In the prior art, the improvement of floor paints often focuses on their wear resistance or impact resistance to ensure that the floor paints are not worn and have good mechanical properties such as toughness and tensile resistance to meet the use performance. Or only improve from the construction process to improve the adhesion ability between the floor paint and the substrate, but this greatly increases the construction requirements for the floor paint.

[0004] Chinese Patent Application CN110240852A discloses a composite nano-TiO₂ and ZnO waterborne epoxy floor surface paint and its preparation method, belonging to the field of chemical coatings. This technical solution includes four components: A, B1, B2, and B3. Among them, the component A includes the following components: nano-TiO₂, nano-ZnO, silane coupling agent, deionized water; the component B1 includes the following components: defoamer, dispersant, leveling agent; the component B2 includes the following components: waterborne epoxy resin, film-forming aid, reactive diluent; the component B3 is a curing agent. The composite nano-TiO₂ and ZnO waterborne epoxy floor paint of this invention not only has high hardness, but also has good waterproof ability and acid and alkali corrosion resistance ability, and has good application prospects. Chinese Patent Application CN103627309A discloses a waterborne epoxy resin floor paint, belonging to the field of chemical materials technology. This waterborne epoxy resin floor paint contains topcoat and primer; based on 100 parts by mass of the total amount of the topcoat, the topcoat contains 73-80 parts by mass of polyurethane, 20-27 parts by mass of waterborne auxiliary agent B; 20-27 parts by mass of waterborne auxiliary agent B contains 5-8 parts by mass of dispersant, 2-3 parts by mass of preservative, 5-8 parts by mass of feel agent, 5-8 parts by mass of wetting agent; the primer contains component A and epoxy resin curing agent, and the mass ratio of component A to epoxy resin curing agent is 1:2.5; based on 100 parts by mass of the total amount of component A, component A contains 60-75 parts by mass of epoxy resin, 2-3 parts by mass of pigment, 18-21 parts by mass of filler, 1-20 parts by mass of waterborne auxiliary agent A; waterborne auxiliary agent A contains dispersant, preservative, feel agent, wetting agent. This waterborne epoxy resin floor paint overcomes the problem of poor anti-slip performance of existing floor coatings. The above patents have all improved some problems faced by current epoxy resin coatings, such as poor mechanical properties and poor anti-slip performance, etc., but they cannot well solve the problems of poor mechanical properties, low wear resistance, and reduced adhesion after long-term use of epoxy resin floor paint, which greatly restricts its large-scale commercial application.

[0005] Therefore, in this field, there is a need to develop an epoxy resin floor paint with good wear resistance, mechanical properties and long-term adhesion, so as to broaden the application field of epoxy resin floor paint. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an epoxy resin floor paint and its preparation method.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: An epoxy resin floor paint, by weight, includes the following raw materials: Component A: 100-120 parts of epoxy resin, 15-20 parts of reactive diluent, 40-50 parts of modified quartz sand, 30-40 parts of barium sulfate, 2-3 parts of dispersant, 0.5-0.8 parts of leveling agent; Component B: 30 - 35 parts of diaminodicyclohexylmethane, 0.2 - 0.3 parts of defoamer.

[0008] Preferably, an epoxy floor paint comprises the following raw materials by weight parts: Component A: 100 - 110 parts of epoxy resin, 15 - 18 parts of reactive diluent, 45 - 50 parts of modified quartz sand, 30 - 35 parts of barium sulfate, 2.5 - 3 parts of dispersant, 0.6 - 0.8 parts of leveling agent; Component B: 30 - 33 parts of diaminodicyclohexylmethane, 0.25 - 0.3 parts of defoamer.

[0009] Preferably, the epoxy value of the epoxy resin is 210 - 230 g / eq, and the reactive diluent is one or more of butyl glycidyl ether, tert - butyl phenyl glycidyl ether or propylene oxide butyl ether.

[0010] Preferably, the dispersant is one or more of BYK111, BYK161, BYK180, the leveling agent is one or two of BYK358N, BYK361N, and the defoamer is a polyether - modified silicone defoamer.

[0011] Preferably, the preparation method of the modified quartz sand comprises the following steps: S1. Add quartz sand into sodium hydroxide solution for impregnation treatment. After the treatment is completed, filter, wash and dry to obtain pretreated quartz sand; S2. Add the pretreated quartz sand in step S1 into an ethanol - aqueous solution, then add vinyltriethoxysilane and carry out a stirring reaction. After the reaction is completed, filter, wash and dry to obtain vinyl - modified quartz sand; S3. Add the vinyl - modified quartz sand in step S2 into toluene, then add diallyl - terminated polyether, 3,4 - diaminobenzenethiol, azobisisobutyronitrile and carry out a heating reaction. After the reaction is completed, filter, wash and dry to obtain modified quartz sand.

[0012] Preferably, the mass concentration of the sodium hydroxide solution in step S1 is 3 - 5%, the temperature of the impregnation treatment is 30 - 40 °C, and the time is 1 - 2 h.

[0013] In the present invention, the modified quartz sand is based on quartz sand, and its main component is silicon dioxide (SiO2). It is an inorganic filler with high hardness, stable chemical properties and low cost, and is commonly used as wear - resistant aggregate. However, its surface is inorganic and polar, and has poor compatibility with organic and relatively non - polar epoxy resin, and the interfacial bonding force is weak. Mildly etching and activating the surface of quartz sand with alkali solution exposes and generates more active hydroxyl groups.

[0014] Preferably, in step S2, the volume ratio of ethanol to water in the aqueous ethanol solution is 3:1, the mass ratio of the pretreated quartz sand to vinyltriethoxysilane is 70-80:6-9, the temperature of the stirring reaction is 60-70 °C, and the time is 2-3 h.

[0015] In the present invention, the quartz sand is modified with a silane coupling agent. On the one hand, the dispersibility of the quartz sand is improved, and on the other hand, a reactive group - vinyl group is introduced onto the quartz sand.

[0016] Preferably, in step S3, the mass ratio of the vinyl quartz sand, diallyl-terminated polyether, azobisisobutyronitrile is 70-80:15-21:5-8:0.2-0.3, the temperature of the heating reaction is 70-80 °C, and the time is 2-3 h.

[0017] In the present invention, through free radical reaction / thiol-ene reaction, two different organic chain segments are introduced onto the quartz sand: a flexible polyether chain and a group with active amino groups; the polyether chain segment in the diallyl-terminated polyether is flexible, and some "cushion pads" are introduced between the rigid inorganic filler and the relatively rigid epoxy resin matrix. These flexible links help absorb and dissipate impact energy, relieve stress concentration, thereby improving the toughness and impact resistance of the floor paint; 3,4-diaminobenzenethiol contains two amino groups, which can undergo ring-opening addition reaction with the epoxy groups in the epoxy resin to form strong covalent bonds. This chemical bond is much stronger than the physical adsorption force (van der Waals force, hydrogen bond, etc.) between the unmodified quartz sand and the resin. The strong interfacial binding force can effectively prevent the penetration and aggregation of water or other media at the interface, thereby fundamentally improving the long-term adhesion of the floor paint and effectively inhibiting problems such as foaming, delamination, peeling, or flaking after long-term use; at the same time, the benzene ring in 3,4-diaminobenzenethiol is a rigid planar structure, and this rigid structure helps transfer stress to the high-hardness quartz sand filler. It reduces the energy dissipation or deformation loss of stress at the interface, enabling the quartz sand to better play the role of a "skeleton" for resisting wear, thereby improving the wear resistance of the floor paint.

[0018] The present invention also protects a preparation method of the epoxy resin floor paint as described above, including the following steps: Weigh the raw materials according to the formula, mix the epoxy resin, dispersant, and active diluent evenly, then add the modified quartz sand and barium sulfate, stir at high speed, and then add the leveling agent and stir at medium speed for 15-25 min to obtain component A; mix diaminodicyclohexylmethane and the defoaming agent evenly under medium-speed stirring to obtain component B; mix component A and component B and stir evenly to obtain the epoxy resin floor paint.

[0019] Preferably, the rotational speed of the high-speed stirring is 1500 - 1700 r / min, and the time is 30 - 40 min; the rotational speed of the medium-speed stirring is 600 - 800 r / min, and the time is 10 - 20 min.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) The epoxy floor paint provided by the present invention, through specific contents of epoxy resin, reactive diluent, diaminodicyclohexylmethane curing agent, and specific types of additives, and introducing quartz sand that has been surface-functionalized modified through multiple steps as a filler, the components act synergistically, effectively overcoming the problems existing in epoxy floor paint in the prior art, such as insufficient mechanical properties (such as impact resistance), poor wear resistance, and peeling and falling off due to the decrease in adhesion after long-term use. It significantly improves the comprehensive performance of the floor paint, extends its service life, and broadens the application range.

[0021] (2) For the epoxy floor paint provided by the present invention, the added modified quartz sand is first treated with alkali to activate the surface, then grafted with vinyl silane, and finally, diallyl-terminated polyether and 3,4-diaminobenzenethiol with active amino groups are co-grafted onto the surface of the quartz sand by free radical initiation / thiol-ene reaction, so that the surface of the quartz sand has amino groups that can participate in the epoxy curing reaction, forming a chemical bond (covalent bond) connection between the filler and the epoxy resin matrix during the curing process, greatly enhancing the interfacial bonding strength between the two. This strong interfacial bonding force is the key to improving the long-term adhesion of the coating. At the same time, the organic flexible chain segments contained in the allyl-terminated polyether help to absorb and dissipate impact energy, relieve stress concentration, thereby improving the toughness and impact resistance of the floor paint. The two functional small molecules act synergistically to effectively prevent problems such as coating blistering, cracking, and peeling caused by interfacial failure, ensuring the lasting and stable combination of the floor paint and the substrate; at the same time, the chemical bond formed between 3,4-diaminobenzenethiol on the modified quartz sand and the epoxy resin "anchors" the quartz sand firmly in the epoxy resin matrix. During the wear process, the quartz sand particles are not easily detached, and can fully exert their high hardness characteristics to resist wear, thereby improving the wear resistance of the epoxy floor paint.

[0022] (3)The epoxy floor paint provided by the present invention not only enhances the interfacial interaction by forming chemical bonds between the surface-grafted amino groups and the epoxy resin, but also the grafted flexible polyether segments may play a certain toughening and stress buffering role in the interfacial region. At the same time, a specific high-efficiency dispersant is selected to ensure the uniform dispersion of the modified quartz sand and barium sulfate in the epoxy resin matrix, avoiding stress concentration points caused by filler agglomeration. These factors work together to make the cured paint film have more excellent wear resistance and mechanical properties (such as hardness, compressive strength, and possibly impact toughness), improving the comprehensive performance of the epoxy floor paint and enabling it to better resist wear and impact caused by walking, vehicle rolling, etc. Detailed implementation manners

[0023] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Unless otherwise specified, the chemical reagents and materials in the present invention are purchased through market channels or synthesized from raw materials purchased through market channels.

[0025] In the present invention, the epoxy resin is epoxy resin E44; the particle size of the quartz sand is 200 - 325 mesh; the particle size of the barium sulfate is 200 - 325 mesh; the diallyl-terminated polyether is purchased from Liaoning Kelong Fine Chemical Co., Ltd., with the product name KLF-X and an average molecular weight of 300 - 1200; the polyether-modified silicone defoamer has the brand name Evonik Tego Foamex 842.

[0026] Example 1

[0027] An epoxy floor paint, by weight, includes the following raw materials: Component A: 110 parts of epoxy resin, 18 parts of butyl glycidyl ether, 45 parts of modified quartz sand, 35 parts of barium sulfate, 2.5 parts of dispersant BYK111, 0.7 parts of leveling agent BYK358N; Component B: 32 parts of diaminodicyclohexylmethane, 0.25 parts of polyether-modified silicone defoamer.

[0028] Among them, the preparation method of the modified quartz sand includes the following steps: S1. Add the quartz sand to a sodium hydroxide solution with a mass fraction of 4%, impregnate it at 35°C for 1.5 h, filter, wash, and dry after the treatment to obtain pretreated quartz sand; S2. Add 75 g of the pretreated quartz sand in step S1 into 1 L of an ethanol aqueous solution (the volume ratio of ethanol to water is 3:1), then add 8 g of vinyltriethoxysilane, and stir and react at 65 °C for 2.5 h. After the reaction is completed, filter, wash, and dry to obtain vinylated quartz sand; S3. Add 75 g of the vinylated quartz sand in step S2 into toluene, then add 18 g of diallyl-terminated polyether, 7 g of 3,4-diaminobenzenethiol, and 0.25 g of azobisisobutyronitrile, and react at 75 °C for 2.5 h. After the reaction is completed, filter, wash, and dry to obtain modified quartz sand.

[0029] A preparation method of an epoxy floor paint, comprising the following steps: Weigh the raw materials according to the formula, mix epoxy resin, dispersant BYK111, and butyl glycidyl ether evenly, then add modified quartz sand and barium sulfate, and stir at a high speed of 1600 r / min for 35 min, then add leveling agent BYK358N, and stir at a medium speed of 700 r / min for 20 min to obtain component A; stir diaminodicyclohexylmethane and polyether-modified silicone defoamer at a medium speed of 700 r / min for 15 min to mix evenly to obtain component B; mix component A and component B and stir evenly to obtain the epoxy floor paint.

[0030] Example 2

[0031] An epoxy floor paint, by weight, comprises the following raw materials: Component A: 100 parts of epoxy resin, 15 parts of epoxy propane butyl ether, 40 parts of modified quartz sand, 30 parts of barium sulfate, 2 parts of dispersant BYK161, 0.5 part of leveling agent BYK361N; Component B: 30 parts of diaminodicyclohexylmethane, 0.2 part of polyether-modified silicone defoamer.

[0032] Among them, the preparation method of the modified quartz sand comprises the following steps: S1. Add quartz sand into a sodium hydroxide solution with a mass fraction of 3%, impregnate and treat at 30 °C for 2 h. After the treatment is completed, filter, wash, and dry to obtain pretreated quartz sand; S2. Add 70 g of the pretreated quartz sand in step S1 into 1 L of an ethanol aqueous solution (the volume ratio of ethanol to water is 3:1), then add 6 g of vinyltriethoxysilane, and stir and react at 60 °C for 3 h. After the reaction is completed, filter, wash, and dry to obtain vinylated quartz sand; S3. Add 70 g of ethylene-functionalized quartz sand from step S2 into toluene, then add 15 g of diallyl-terminated polyether, 5 g of 3,4-diaminobenzenethiol, and 0.2 g of azobisisobutyronitrile, and react at 70 °C for 3 h. After the reaction is completed, filter, wash, and dry to obtain modified quartz sand.

[0033] A preparation method of an epoxy floor paint, comprising the following steps: Weigh the raw materials according to the formula, mix epoxy resin, dispersant BYK161, and epoxy propane butyl ether evenly, then add modified quartz sand and barium sulfate, and stir at a high speed of 1500 r / min for 40 min. Then add leveling agent BYK361N and stir at a medium speed of 600 r / min for 25 min to obtain component A; stir diaminodicyclohexylmethane and polyether-modified silicone defoamer at a medium speed of 600 r / min for 20 min to mix evenly and obtain component B; mix component A and component B and stir evenly to obtain the epoxy floor paint.

[0034] Example 3

[0035] An epoxy floor paint, by weight, comprises the following raw materials: Component A: 120 parts of epoxy resin, 20 parts of tert-butylphenyl glycidyl ether, 50 parts of modified quartz sand, 40 parts of barium sulfate, 3 parts of dispersant BYK180, 0.8 part of leveling agent BYK358N; Component B: 35 parts of diaminodicyclohexylmethane, 0.3 part of polyether-modified silicone defoamer.

[0036] Among them, the preparation method of the modified quartz sand comprises the following steps: S1. Add quartz sand into a sodium hydroxide solution with a mass fraction of 5%, impregnate at 40 °C for 1 h, filter, wash, and dry after the treatment is completed to obtain pretreated quartz sand; S2. Add 80 g of the pretreated quartz sand from step S1 into 1 L of an ethanol aqueous solution (the volume ratio of ethanol to water is 3:1), then add 9 g of vinyltriethoxysilane, and stir and react at 70 °C for 2 h. After the reaction is completed, filter, wash, and dry to obtain ethylene-functionalized quartz sand; S3. Add 80 g of the ethylene-functionalized quartz sand from step S2 into toluene, then add 21 g of diallyl-terminated polyether, 8 g of 3,4-diaminobenzenethiol, and 0.3 g of azobisisobutyronitrile, and react at 80 °C for 2 h. After the reaction is completed, filter, wash, and dry to obtain modified quartz sand.

[0037] A preparation method of an epoxy floor paint, comprising the following steps: Weigh the raw materials according to the formula. Mix epoxy resin, dispersant BYK180, and tert-butylphenyl glycidyl ether evenly. Then add modified quartz sand and barium sulfate, and stir at a high speed of 1700 r / min for 30 min. After that, add leveling agent BYK358N and stir at a medium speed of 800 r / min for 15 min to obtain Component A; Mix diaminodicyclohexylmethane and polyether-modified silicone defoamer at a medium speed of 800 r / min for 10 min to mix evenly and obtain Component B; Mix Component A and Component B and stir evenly to obtain the epoxy floor paint.

[0038] Comparative Example 1

[0039] An epoxy floor paint, by weight, comprises the following raw materials: Component A: 110 parts of epoxy resin, 18 parts of butyl glycidyl ether, 45 parts of modified quartz sand, 35 parts of barium sulfate, 2.5 parts of dispersant BYK111, 0.7 part of leveling agent BYK358N; Component B: 32 parts of diaminodicyclohexylmethane, 0.25 part of polyether-modified silicone defoamer.

[0040] Among them, the preparation method of the modified quartz sand comprises the following steps: S1. Add quartz sand to a sodium hydroxide solution with a mass fraction of 4%, impregnate at 35 °C for 1.5 h, filter, wash, and dry after treatment to obtain pretreated quartz sand; S2. Add 75 g of the pretreated quartz sand in Step S1 to 1 L of an ethanol aqueous solution (volume ratio of ethanol to water is 3:1), then add 8 g of vinyltriethoxysilane, stir and react at 65 °C for 2.5 h, filter, wash, and dry after the reaction to obtain vinyl quartz sand; S3. Add 75 g of the vinyl quartz sand in Step S2 to toluene, then add 18 g of diallyl-terminated polyether and 0.25 g of azobisisobutyronitrile, react at 75 °C for 2.5 h, filter, wash, and dry after the reaction to obtain modified quartz sand.

[0041] A preparation method of an epoxy floor paint comprises the following steps: Weigh the raw materials according to the formula. Mix epoxy resin, dispersant BYK111, and butyl glycidyl ether evenly, and then add modified quartz sand and barium sulfate. After high-speed stirring at 1600 r / min for 35 min, add leveling agent BYK358N and stir at medium speed at 700 r / min for 20 min to obtain Component A; stir diaminodicyclohexylmethane and polyether-modified silicone defoamer evenly at medium speed at 700 r / min for 15 min to obtain Component B; mix Component A and Component B and stir evenly to obtain the epoxy floor paint.

[0042] Compared with Example 1, 3,4-diaminobenzenethiol was not introduced onto the modified quartz sand in this comparative example.

[0043] Comparative Example 2

[0044] An epoxy floor paint, by weight, comprises the following raw materials: Component A: 110 parts of epoxy resin, 18 parts of butyl glycidyl ether, 45 parts of modified quartz sand, 35 parts of barium sulfate, 2.5 parts of dispersant BYK111, 0.7 part of leveling agent BYK358N; Component B: 32 parts of diaminodicyclohexylmethane, 0.25 part of polyether-modified silicone defoamer.

[0045] Among them, the preparation method of the modified quartz sand comprises the following steps: S1. Add quartz sand into a sodium hydroxide solution with a mass fraction of 4%, impregnate it at 35 °C for 1.5 h, filter, wash, and dry after the treatment to obtain pretreated quartz sand; S2. Add 75 g of the pretreated quartz sand in Step S1 into 1 L of an ethanol aqueous solution (the volume ratio of ethanol to water is 3:1), then add 8 g of vinyltriethoxysilane, and stir and react at 65 °C for 2.5 h. Filter, wash, and dry after the reaction to obtain vinylated quartz sand; S3. Add 75 g of the vinylated quartz sand in Step S2 into toluene, then add 7 g of 3,4-diaminobenzenethiol and 0.25 g of azobisisobutyronitrile, and react at 75 °C for 2.5 h. Filter, wash, and dry after the reaction to obtain modified quartz sand.

[0046] A preparation method of an epoxy floor paint comprises the following steps: Weigh the raw materials according to the formula. Mix epoxy resin, dispersant BYK111, and butyl glycidyl ether evenly, and then add modified quartz sand and barium sulfate. After high-speed stirring at 1600 r / min for 35 min, add leveling agent BYK358N and stir at medium speed for 20 min at 700 r / min to obtain Component A; Stir diaminodicyclohexylmethane and polyether-modified silicone defoamer at medium speed for 15 min at 700 r / min to mix evenly and obtain Component B; Mix Component A and Component B and stir evenly to obtain the epoxy floor paint.

[0047] Compared with Example 1, diallyl-terminated polyether was not introduced onto the modified quartz sand in this comparative example.

[0048] Comparative Example 3

[0049] An epoxy floor paint, by weight, comprises the following raw materials: Component A: 110 parts of epoxy resin, 18 parts of butyl glycidyl ether, 45 parts of modified quartz sand, 35 parts of barium sulfate, 2.5 parts of dispersant BYK111, 0.7 part of leveling agent BYK358N; Component B: 32 parts of diaminodicyclohexylmethane, 0.25 part of polyether-modified silicone defoamer.

[0050] Among them, the preparation method of the modified quartz sand comprises the following steps: S1. Add quartz sand to a sodium hydroxide solution with a mass fraction of 4%, impregnate it at 35 °C for 1.5 h, filter, wash, and dry after the treatment to obtain pretreated quartz sand; S2. Add 75 g of the pretreated quartz sand in Step S1 to 1 L of an ethanol aqueous solution (the volume ratio of ethanol to water is 3:1), then add 8 g of vinyltriethoxysilane, stir and react at 65 °C for 2.5 h, filter, wash, and dry after the reaction to obtain modified quartz sand.

[0051] A preparation method of an epoxy floor paint comprises the following steps: Weigh the raw materials according to the formula. Mix epoxy resin, dispersant BYK111, and butyl glycidyl ether evenly, and then add modified quartz sand and barium sulfate. After high-speed stirring at 1600 r / min for 35 min, add leveling agent BYK358N and stir at medium speed for 20 min at 700 r / min to obtain Component A; Stir diaminodicyclohexylmethane and polyether-modified silicone defoamer at medium speed for 15 min at 700 r / min to mix evenly and obtain Component B; Mix Component A and Component B and stir evenly to obtain the epoxy floor paint.

[0052] Compared with Example 1, in this comparative example, the bisallyl-terminated polyether and 3,4-diaminobenzenethiol were not introduced into the modified quartz sand.

[0053] The epoxy resin floor paint prepared in Examples 1-3 and Comparative Examples 1-3 was applied on a 15mm×20mm steel plate, cured at room temperature, and demolded to obtain a test sample; the compressive strength was tested with reference to GB / T50589-2010 "Technical Specification for Epoxy Resin Self-leveling Floor Engineering"; the impact strength was tested with reference to GB / T 1732-2020 "Determination of Impact Resistance of Paint Film". Before the test, the sample drying plate coated with the paint film was placed in an environment with a temperature of 23°C and a relative humidity of 50% for 20 hours. The sample plate was a tinplate plate; the wear resistance was tested in accordance with GB / T 1768-2006 "Determination of Wear Resistance of Paints and Varnishes by Rotating Rubber Grinding Wheel Method", using a CS-17 wheel at a weight loss of 1000 revolutions with a load of 1kg; the adhesion was tested with reference to GB / T 5210-2006 "Pull-off Adhesion Test for Paints and Clear Coats", the substrate is a steel plate, the coating thickness is 200μm; the adhesion retention rate is to place the steel plate coated with 200μm thick epoxy resin floor paint in water at a temperature of 50℃, soak for 720h and then test the adhesion again, and calculate the ratio of the adhesion to the initial adhesion. The test results are shown in Table 1.

[0054] Table 1

[0055] It can be seen from Table 1 above that the epoxy resin floor paint prepared by the present invention has good compressive strength and impact resistance, and also has good wear resistance and long-term adhesion retention rate.

[0056] The above contents are further detailed descriptions of the present invention in combination with specific implementation examples. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

[0057] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An epoxy floor paint, characterized in that, By weight, it includes the following raw materials: Component A: 100 - 120 parts of epoxy resin, 15 - 20 parts of active diluent, 40 - 50 parts of modified quartz sand, 30 - 40 parts of barium sulfate, 2 - 3 parts of dispersant, 0.5 - 0.8 parts of leveling agent; Component B: 30 - 35 parts of diaminodicyclohexylmethane, 0.2 - 0.3 parts of defoamer.

2. The epoxy floor paint according to claim 1, characterized in that, By weight, it includes the following raw materials: Component A: 100 - 110 parts of epoxy resin, 15 - 18 parts of active diluent, 45 - 50 parts of modified quartz sand, 30 - 35 parts of barium sulfate, 2.5 - 3 parts of dispersant, 0.6 - 0.8 parts of leveling agent; Component B: 30 - 33 parts of diaminodicyclohexylmethane, 0.25 - 0.3 parts of defoamer.

3. The epoxy floor paint according to claim 1, characterized in that The epoxy value of the epoxy resin is 210 - 230 g / eq, and the active diluent is one or more of butyl glycidyl ether, tert-butyl phenyl glycidyl ether, and propylene oxide butyl ether.

4. The epoxy floor paint according to claim 1, characterized in that, The dispersant is one or more of BYK111, BYK161, and BYK180, the leveling agent is one or two of BYK358N and BYK361N, and the defoamer is a polyether-modified silicone defoamer.

5. The epoxy floor paint according to claim 1, characterized in that, The preparation method of the modified quartz sand includes the following steps: S1. Add quartz sand into sodium hydroxide solution for impregnation treatment to obtain pretreated quartz sand; S2. Add the pretreated quartz sand into an ethanol aqueous solution, then add vinyltriethoxysilane and stir to react to obtain vinyl quartz sand; S3. Add the vinyl quartz sand into toluene, then add diallyl-terminated polyether, 3,4-diaminobenzenethiol, and azobisisobutyronitrile, and heat to react to obtain modified quartz sand.

6. The epoxy floor paint according to claim 5, characterized in that, In step S1, the mass concentration of the sodium hydroxide solution is 3 - 5%, the temperature of the impregnation treatment is 30 - 40 °C, and the time is 1 - 2 h.

7. The epoxy floor paint according to claim 5, wherein In step S2, the volume ratio of ethanol to water in the ethanol aqueous solution is 3:1, the mass ratio of the pretreated quartz sand to vinyltriethoxysilane is 70 - 80:6 - 9, the temperature of the stirring reaction is 60 - 70 °C, and the time is 2 - 3 h.

8. The epoxy floor paint according to claim 5, characterized in that, In step S3, the mass ratio of the vinyl quartz sand, diallyl-terminated polyether, and azobisisobutyronitrile is 70 - 80:15 - 21:5 - 8:0.2 - 0.3, the temperature of the heating reaction is 70 - 80 °C, and the time is 2 - 3 h.

9. A preparation method of the epoxy floor paint according to any one of claims 1-8, characterized in that, It includes the following steps: Weigh the raw materials according to the formula, mix the epoxy resin, dispersant, and active diluent evenly, then add the modified quartz sand and barium sulfate. After high-speed stirring, add the leveling agent and stir at medium speed for 15 - 25 min to obtain Component A; mix diaminodicyclohexylmethane and the defoamer evenly under medium-speed stirring to obtain Component B; mix Component A and Component B and stir evenly to obtain the epoxy floor paint.

10. The preparation method according to claim 9, characterized in that, The rotation speed of the high-speed stirring is 1500 - 1700 r / min, and the time is 30 - 40 min; the rotation speed of the medium-speed stirring is 600 - 800 r / min, and the time is 10 - 20 min.

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