Solid wood floor surface hydrophobic wear-resistant coating and preparation method thereof

Abstract

The invention discloses a hydrophobic wear-resistant coating on the surface of a solid wood floor and a preparation method thereof, and relates to the technical field of coatings. The invention discloses a preparation method of a hydrophobic wear-resistant coating on the surface of a solid wood floor, which comprises the following steps: coating a hydrophobic wear-resistant coating on the surface of the floor, and curing to obtain the solid wood floor with the hydrophobic wear-resistant coating on the surface, the hydrophobic wear-resistant coating comprises the following raw materials in parts by weight: 75-85 parts of modified resin, 1-2 parts of a wetting dispersant, 1-2 parts of a defoaming agent, 1-2 parts of a flatting agent and 10-20 parts of water. The modified coating disclosed by the invention is obtained by crosslinking and modifying polyurethane acrylate and silicon dioxide; the hydrophobic wear-resistant coating prepared by the invention is high in adhesion strength with the floor, good in wear resistance and good in pollution resistance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a hydrophobic and wear-resistant coating on the surface of a solid wood floor and a preparation method thereof. Background Art

[0002] The natural beauty of wooden flooring and its timeless elegant appearance make it an important part of modern interior design. As one of the important components of wood materials, porous fiber makes wood materials hydrophilic and has the property of swelling and shrinking. In order to meet people's demand for high appearance, the surface of wood must be coated with a protective layer. Due to environmental and economic reasons, factory-produced wooden floors are usually protected by UV-cured coatings. UV curing technology was first used in wood coating. Due to the advantages of fast, assembly line production, beautiful coating, solid and durable, and good environmental performance, UV curing coating has become the largest and fastest growing application field. Water-based UV curing coating uses water as solvent, which does not pollute the air after volatilization. It can also be cured quickly by UV irradiation, thus having the advantages of low organic volatiles and fast curing. Water-based UV curing coating is developed on the basis of water-based technology and UV curing technology. It has the advantages of low VOC release and fast curing, and can obtain a coating film with high hardness and flexibility. It is an important development direction of wood floor coating.

[0003] Waterborne UV curing coatings are mainly in three types: emulsion type, water dispersion type and aqueous solution type, including epoxy acrylate (EA), polyurethane acrylate (PUA), polyester acrylate (PEA), acrylated polyacrylate coatings, etc. However, when wood materials are coated with waterborne UV coatings, there are still problems such as poor mechanical properties and ultra-high gloss, which cannot meet the requirements of high-end solid wood floors for coating performance. There are usually several methods to improve the hardness and wear resistance of UV coatings: (1) Adding high-functionality resins and monomers to UV coatings; however, this will increase the viscosity of the coating and cause the coating film to become brittle, reducing the adhesion of the coating; (2) Through organic / inorganic hybrid materials to achieve functional composites, performance complementarity and optimization, adding inorganic particles to fill the coating to improve its surface hardness and wear resistance; however, with the addition of inorganic particles, the inorganic particles agglomerate in the polymer, resulting in the inorganic particles being unable to fully absorb and scatter the visible light incident on its surface, resulting in a decrease in the gloss of the coating. Summary of the invention

[0004] The purpose of the present invention is to provide a hydrophobic and wear-resistant coating on the surface of a solid wood floor and a preparation method thereof, so as to solve the following technical problems: When existing wood materials are coated with water-based UV coatings, they have problems of poor mechanical properties and low gloss.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor comprises the following steps: applying a hydrophobic and wear-resistant coating on the surface of the floor, and curing the coating to obtain a solid wood floor having a hydrophobic and wear-resistant coating on the surface; The hydrophobic wear-resistant coating comprises the following raw materials in parts by weight: 75-85 parts of modified resin, 1-2 parts of wetting and dispersing agent, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, and 10-20 parts of water; The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, add isophorone diisocyanate, polyester diol, p-hydroxyanisole, and dibutyltin dilaurate component one into a reaction kettle, control the temperature at 60-70°C, and keep the reaction warm for 1-3 hours, add hydroxyethyl acrylate and dibutyltin dilaurate component two, control the temperature at 70-80°C, and keep the reaction warm for 3-6 hours, add 3-mercapto-1-propylamine, and keep the reaction warm for 1-3 hours to obtain component one; S2: Add component 1 to the reaction bottle, adjust the pH to 6-7, add epoxy-modified porous silica, disperse evenly, control the temperature to 40-50°C, keep warm for 10-30 minutes, add hydrochloric acid to adjust the pH to 6-7, and obtain component 2; S3: Add the components of di- and dodecyl tertiary amine into the reaction kettle B, disperse them evenly, control the temperature at 60-70°C, keep the temperature for 3-6 hours, and perform vacuum distillation to obtain a modified resin.

[0006] As a further solution of the present invention: in S1, the addition ratio of isophorone diisocyanate: polyester diol: hydroxyethyl acrylate: 3-mercapto-1-propylamine is 1-2g: 10g: 0.5-1g: 0.1-0.5g.

[0007] As a further scheme of the present invention: the amount of p-hydroxyanisole added in S1 accounts for 0.03-0.06% of the total mass of isophorone diisocyanate, polyester diol and hydroxyethyl acrylate; the dibutyl tin dilaurate component one and the dibutyl tin dilaurate component two are both dibutyl tin dilaurate; the amount of dibutyl tin dilaurate added accounts for 0.1-0.3% of the total mass of isophorone diisocyanate, polyester diol and hydroxyethyl acrylate; the addition ratio of dibutyl tin dilaurate component one and dibutyl tin dilaurate component two is 1:1-1.1.

[0008] As a further solution of the present invention: the mass ratio of component 1 in S2 to epoxy-modified porous silica is 100:1-10.

[0009] As a further solution of the present invention: the mass ratio of the di- and dodecyl-tertiary amine components in S3 is 100:2.5-10.

[0010] As a further solution of the present invention: the epoxy-modified porous silica is obtained by hydrolyzing and modifying the porous silica with γ-glycidyloxypropyltrimethoxysilane.

[0011] As a further scheme of the present invention: The preparation method of epoxy-modified porous silica comprises the following steps: adding methanol and deionized water into a reaction bottle, dispersing them evenly, adding γ-glycidyloxypropyltrimethoxysilane, adjusting the pH to 3-4, controlling the temperature to 50-60°C, keeping warm for 1-3 hours, adding porous silica, keeping warm for 1-3 hours, cooling to room temperature, washing with methanol, filtering, and drying to obtain epoxy-modified porous silica.

[0012] As a further solution of the present invention: the addition ratio of methanol, deionized water, γ-glycidyloxypropyltrimethoxysilane and porous silica is 1800 mL: 150-450 mL: 10-50 g: 100 g.

[0013] As a further solution of the present invention: the specific steps of curing are: placing in an oven at 40-50° C. for drying for 10 min; ultraviolet irradiation at a distance of 30 cm for 10-30 s.

[0014] As a further solution of the present invention: a primer layer is arranged between the floor and the hydrophobic and wear-resistant coating; the primer layer is obtained by coating the primer on the surface of the floor; the primer comprises the following raw materials in weight percentage: 80-85% acrylic emulsion, 0.4-1% defoamer, 0.1-0.5% wetting dispersant, 1-2% zinc stearate, 0.3-0.6% thickener, 0.1-0.2% 30wt% ammonia water, 1-3% tannin inhibitor, 10-13% water, and the sum of the percentages of each raw material is 100%.

[0015] As a further solution of the present invention: the defoaming agent is one of polydimethylsiloxane, polyoxypropylene polyoxyethylene glycerol ether, and polyether modified silicon.

[0016] As a further embodiment of the present invention: the wetting agent is one of sodium dodecyl sulfate and nonylphenol polyoxyethylene ether As a further embodiment of the present invention: the thickener is a nonionic polyurethane associative thickener.

[0017] As a further embodiment of the present invention: the primer layer is obtained by applying the primer at least twice, and the amount of the primer applied each time is 8-15 g / m 2 .

[0018] As a further embodiment of the present invention: the hydrophobic wear-resistant coating is obtained by applying the hydrophobic wear-resistant coating at least twice, and the coating amount of the hydrophobic wear-resistant coating is 5-10 g / m 2 .

[0019] A hydrophobic and wear-resistant coating on the surface of a solid wood floor, made by any one of the above preparation methods.

[0020] Beneficial effects of the present invention: (1) This application adopts the method of chain extension followed by esterification, using isophorone diisocyanate and polyester diol as raw materials to first extend the chain, and then esterify and cap with hydroxyethyl acrylate to generate a prepolymer with double bonds at both ends; and use 3-mercapto-1-propylamine to click with the double bonds of the prepolymer to obtain component one; this application uses the amino group on component one to react with epoxy-modified porous silica to obtain component two; finally, dodecyl tertiary amine is reacted with component two to obtain a modified resin. The modified resin prepared in this application is mixed with additives such as wetting dispersants, defoamers, and leveling agents to obtain a UV-curable water-based topcoat.

[0021] The present application organically modifies the porous silica, which not only increases the dispersibility of the silica in the resin, but also modifies the prepolymer by epoxy-modified porous silica. The epoxy-modified porous silica gives the coating a lower surface free energy, and the coating forms a stable siloxane film with excellent hydrophobicity, stain resistance and wear resistance, effectively improving the problems of low hardness and wear resistance of existing UV coatings. The hydrophobic and wear-resistant coating prepared by the present application has excellent mechanical properties and thermal stability and reduces water absorption.

[0022] (2) The modified resin prepared in the present application is added to the coating to effectively improve the cohesion and mechanical interlocking properties of the coating, and the adhesion is effectively improved; the epoxy-modified porous silica is grafted with the resin through molecular chains, thereby making it uniformly dispersed in the coating, effectively avoiding the problem that the elasticity of the polymer itself is reduced due to the addition of silica to the coating, resulting in the coating being unable to firmly adhere to the surface of the wooden substrate; the epoxy-modified porous silica in the present application is combined with the prepolymer through chemical bonds to obtain a modified resin, thereby enhancing the coating's ability to resist external destructive forces; the epoxy-modified porous silica accelerates the coating's ability to release moisture, improves the drying speed, and accelerates the discharge of solvents.

[0023] (3) The present application first applies a primer to the polished wooden floor surface. The primer provides good permeability and excellent adhesion. Multiple coats of primer provide good physical and mechanical properties such as mechanical strength, wear resistance, and hardness. The primer and topcoat of the present application are further cured simultaneously during the UV curing process, and the topcoat and primer are further cured during the final topcoat curing process, ultimately achieving an effect on the substrate adhesion and interlayer bonding strength.

[0024] (4) This application utilizes the characteristics of anionic acrylic emulsion, such as small particle size, good permeability and good film-forming properties, to prepare a primer with anionic acrylic emulsion as the base material, and adds additives such as tannin inhibitors to the primer; the tannin inhibitors are composed of metal cation salt compounds, which can anchor the tannin color-developing groups to achieve anti-bleeding performance; zinc stearate is added to improve the wear resistance of the coating. This application also adds ammonia water to the primer component to effectively regulate the reaction between the acid ions of the anionic acrylic emulsion and the metal cations in the tannin inhibitor, which leads to the problem of decreased stability of the primer coating. This application first applies a primer and then a hydrophobic and wear-resistant coating on the floor surface. The coating structure significantly improves the flexibility of the paint film, alleviates the stress between the existing paint film and the substrate due to shrinkage and swelling, and causes the paint film to crack, wrinkle and fall off.

[0025] (5) The present application utilizes epoxy-modified porous silica, dodecyl tertiary amine and prepolymer molecular chain cross-linking process to generate organic antibacterial groups. The organic antibacterial groups are adsorbed on the cell membrane surface of negatively charged bacteria and can also destroy the structure of the cell membrane, thus giving the coating good antibacterial properties. DETAILED DESCRIPTION

[0026] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1 The preparation method of epoxy-modified porous silica comprises the following steps: B1: The preparation method of porous silica comprises the following steps: 1 g of tetradecyltrimethylammonium bromide and 480 mL of deionized water are added to a reaction kettle and dispersed evenly, 3.5 mL of a 2 mol / L aqueous sodium hydroxide solution is added, the temperature is controlled at 90 ° C, 5 mL of ethyl orthosilicate is added, the reaction is kept warm for 3 h, filtered, washed with methanol and water in sequence, and calcined in a muffle furnace at 600 ° C to obtain porous silica; B2: Add 1800 mL of methanol and 200 mL of deionized water into a reaction bottle and disperse evenly, add 50 g of γ-glycidyloxypropyltrimethoxysilane, adjust the pH to 3, control the temperature to 50°C, keep warm for 3 hours, add 100 g of porous silica, keep warm for 3 hours, cool to room temperature, wash with methanol, filter, and dry to obtain epoxy-modified porous silica.

[0028] Example 2 The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of poly(ethylene glycol adipate) (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to a reaction kettle, the temperature was controlled at 60°C, and the reaction was kept warm for 1 h. 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 70°C, and the reaction was kept warm for 3 h. 2 g of 3-mercapto-1-propylamine was added, and the reaction was kept warm for 1 h to obtain component 1; S2: Add 100g of component 1 to a reaction bottle, adjust the pH to 6, add 5g of epoxy-modified porous silica prepared in Example 1, disperse evenly, control the temperature to 40°C, keep warm for 10 minutes, add hydrochloric acid to adjust the pH to 6, and obtain component 2; S3: Add 100g of component 2 and 2.5g of dodecyl tert-amine into reactor B, disperse evenly, control the temperature at 60°C, keep warm for 3h, and perform vacuum distillation to obtain a modified resin.

[0029] Example 3 The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of poly(ethylene glycol adipate) (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to a reaction kettle, the temperature was controlled at 65°C, and the reaction was kept warm for 2 h. 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 75°C, and the reaction was kept warm for 4 h. 2 g of 3-mercapto-1-propylamine was added, and the reaction was kept warm for 2 h to obtain component 1. S2: Add 100 g of component 1 to a reaction bottle, adjust the pH to 6, add 5 g of epoxy-modified porous silica prepared in Example 1, disperse evenly, control the temperature to 45° C., keep warm for 20 min, add hydrochloric acid to adjust the pH to 6, and obtain component 2; S3: Add 100g of component 2 and 6g of dodecyl tert-amine into reactor B, disperse evenly, control the temperature at 65°C, keep warm for 4h, and perform vacuum distillation to obtain a modified resin.

[0030] Example 4 The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of poly(ethylene glycol adipate) (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to a reaction kettle, the temperature was controlled at 70°C, and the reaction was kept warm for 3 h. 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 80°C, and the reaction was kept warm for 6 h. 2 g of 3-mercapto-1-propylamine was added, and the reaction was kept warm for 3 h to obtain component 1. S2: Add 100g of component 1 to a reaction bottle, adjust the pH to 7, add 10g of epoxy-modified porous silica prepared in Example 1, disperse evenly, control the temperature to 50°C, keep warm for 30min, add hydrochloric acid to adjust the pH to 7, and obtain component 2; S3: Add 100g of component 2 and 10g of dodecylamine into reactor B, disperse evenly, control the temperature to 70°C, keep warm for 6h, and perform vacuum distillation to obtain a modified resin.

[0031] Embodiment 5 A method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor comprises the following steps: A1: Preparation of primer: 84g of Dow ROSHIELD PR-600 anionic acrylic emulsion for tannin sealing, 1g of defoamer YCK-615, 0.4g of sodium dodecyl sulfate, 2g of zinc stearate, 0.3g of thickener PUR62, 0.3g of thickener PUR40, 0.2g of 30wt% ammonia water, 1.8g of tannin inhibitor L-44 (Hainos, USA), and 10g of water were mixed to obtain a primer; A2: Apply three layers of primer on the floor surface, and cure each time. The amount of primer applied per time is 8g / m 2 ; A3: Preparation of hydrophobic and wear-resistant coating: 80 g of the modified resin prepared in Example 2, 2 g of a wetting and dispersing agent, 1.5 g of a defoaming agent (TEGO AIREX 902W defoaming agent), 1.5 g of a leveling agent (TEGO Glide 450 leveling agent), and 15 g of water were mixed to obtain a hydrophobic and wear-resistant coating; A4: Apply 4 layers of hydrophobic and wear-resistant coating on the surface of the wood board coated with primer, and cure each time (365nm UV irradiation distance 30cm, irradiation 10s), to obtain a solid wood floor with a hydrophobic and wear-resistant coating on the surface; the amount of primer applied per time is 8g / m 2 .

[0032] Example 6 A method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor comprises the following steps: A1: Preparation of primer: 84g of Dow ROSHIELD PR-600 anionic acrylic emulsion for tannin sealing, 1g of defoamer YCK-615, 0.4g of sodium dodecyl sulfate, 2g of zinc stearate, 0.3g of thickener PUR62, 0.3g of thickener PUR40, 0.2g of 30wt% ammonia water, 1.8g of tannin inhibitor L-44 (Hainos, USA), and 10g of water were mixed to obtain a primer; A2: Apply three layers of primer on the floor surface, and cure each time. The amount of primer applied per time is 8g / m 2 ; A3: Preparation of hydrophobic and wear-resistant coating: 80 g of the modified resin prepared in Example 3, 2 g of a wetting and dispersing agent, 1.5 g of a defoaming agent (TEGO AIREX 902W defoaming agent), 1.5 g of a leveling agent (TEGO Glide 450 leveling agent), and 15 g of water were mixed to obtain a hydrophobic and wear-resistant coating; A4: Apply 4 layers of hydrophobic and wear-resistant coating on the surface of the wood board coated with primer, and cure each time (365nm UV irradiation distance 30cm, irradiation 10s), to obtain a solid wood floor with a hydrophobic and wear-resistant coating on the surface; the amount of primer applied per time is 8g / m 2 .

[0033] Embodiment 7 A method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor comprises the following steps: A1: Preparation of primer: 84g of Dow ROSHIELD PR-600 anionic acrylic emulsion for tannin sealing, 1g of defoamer YCK-615, 0.4g of sodium dodecyl sulfate, 2g of zinc stearate, 0.3g of thickener PUR62, 0.3g of thickener PUR40, 0.2g of 30wt% ammonia water, 1.8g of tannin inhibitor L-44 (Hainos, USA), and 10g of water were mixed to obtain a primer; A2: Apply three layers of primer on the floor surface, and cure each time. The amount of primer applied per time is 8g / m 2 ; A3: Preparation of hydrophobic and wear-resistant coating: 80 g of the modified resin prepared in Example 4, 2 g of a wetting and dispersing agent, 1.5 g of a defoaming agent (TEGO AIREX 902W defoaming agent), 1.5 g of a leveling agent (TEGO Glide 450 leveling agent), and 15 g of water were mixed to obtain a hydrophobic and wear-resistant coating; A4: Apply 4 layers of hydrophobic and wear-resistant coating on the surface of the wood board coated with primer, and cure each time (365nm UV irradiation distance 30cm, irradiation 10s), to obtain a solid wood floor with a hydrophobic and wear-resistant coating on the surface; the amount of primer applied per time is 8g / m 2 .

[0034] Comparative Example 1 The preparation method of epoxy-modified silica comprises the following steps: Add 1800 mL of methanol and 200 mL of deionized water into the reaction bottle and disperse evenly, add 50 g of γ-glycidyloxypropyltrimethoxysilane, adjust the pH to 3, control the temperature to 50°C, keep warm for 3 hours, add 100 g of nano-silica, keep warm for 3 hours, cool to room temperature, wash with methanol, filter, and dry to obtain epoxy-modified silica.

[0035] Comparative Example 2 The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of poly(ethylene glycol adipate) (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to a reaction kettle, the temperature was controlled at 65°C, and the reaction was kept warm for 2 h. 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 75°C, and the reaction was kept warm for 4 h. 2 g of 3-mercapto-1-propylamine was added, and the reaction was kept warm for 2 h to obtain component 1. S2: Add 100g of component 1 to a reaction bottle, adjust the pH to 6, add 5g of epoxy-modified silica prepared in Comparative Example 1, disperse evenly, control the temperature to 45°C, keep warm for 20min, add hydrochloric acid to adjust the pH to 6, and obtain component 2; S3: Add 100g of component 2 and 6g of dodecyl tert-amine into reactor B, disperse evenly, control the temperature at 65°C, keep warm for 4h, and perform vacuum distillation to obtain a modified resin.

[0036] Comparative Example 3 The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of poly(ethylene glycol adipate) (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to a reaction kettle, the temperature was controlled at 65°C, and the reaction was kept warm for 2 h. 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 75°C, and the reaction was kept warm for 6 h. 2 g of 3-mercapto-1-propylamine was added, and the reaction was kept warm for 2 h to obtain component 1. S2: Add 100g of component 1 to a reaction bottle, adjust the pH to 6, add 5g of epoxy-modified porous silica prepared in Example 1, disperse evenly, control the temperature to 45°C, keep warm for 20min, add hydrochloric acid to adjust the pH to 6, and obtain a modified resin.

[0037] Comparative Example 4 The preparation method of the modified resin comprises the following steps: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of diethylene glycol adipate (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to the reactor, the temperature was controlled at 65°C and the reaction was kept warm for 2 hours, 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 75°C and the reaction was kept warm for 4 hours, 2 g of 3-mercapto-1-propylamine was added, and the reaction was kept warm for 2 hours to obtain a modified resin.

[0038] Comparative Example 5 The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, 15 g of isophorone diisocyanate, 100 g of poly(ethylene glycol adipate) (PDEGA3000), 0.05 g of p-hydroxyanisole, and 0.125 g of dibutyltin dilaurate were added to a reaction kettle, the temperature was controlled at 65°C, and the reaction was kept warm for 2 h. 10 g of ethyl hydroxyacrylate and 0.125 g of dibutyltin dilaurate were added, the temperature was controlled at 75°C, and the reaction was kept warm for 6 h to obtain component 1; S2: Add 100 g of component 1 to a reaction bottle, adjust the pH to 6, add 5 g of epoxy-modified porous silica prepared in Example 1, disperse evenly, control the temperature to 45° C., keep warm for 20 min, add hydrochloric acid to adjust the pH to 6, and obtain component 2; S3: Add 100g of component 2 and 6g of dodecyl tert-amine into reactor B, disperse evenly, control the temperature at 65°C, keep warm for 4h, and perform vacuum distillation to obtain a modified resin.

[0039] Comparative Example 6 Compared with Example 6, Comparative Example 6 is only replaced by an equal amount of the modified resin prepared in Example 3 added in Example 6 with the modified resin prepared in Comparative Example 2, and the other components and preparation method are completely the same as those in Example 6.

[0040] Comparative Example 7 Compared with Example 6, Comparative Example 7 is only that the modified resin prepared in Example 3 added in Example 6 is replaced by the modified resin prepared in Comparative Example 3 in an equal amount, and the other components and preparation method are completely the same as those in Example 6.

[0041] Comparative Example 8 Compared with Example 6, Comparative Example 8 is only that the modified resin prepared in Example 3 added in Example 6 is replaced by the modified resin prepared in Comparative Example 4 in equal amount, and the other components and preparation method are completely the same as those in Example 6.

[0042] Comparative Example 9 Compared with Example 6, Comparative Example 9 is only that the modified resin prepared in Example 3 added in Example 6 is replaced by the modified resin prepared in Comparative Example 5 in equal amount, and the other components and preparation method are completely the same as those in Example 6.

[0043] Performance Testing (1) Adhesion: Sampling was carried out according to the method in 6.3.5 of GB / T 18103-2013 “Solid Wood Composite Flooring” and testing was carried out according to GB / T 4893.4-2013 “Tests for Physical and Chemical Properties of Furniture Surface Paint Films Part 4 Adhesion Cross Cutting Method”. The test results are shown in Table 1. (2) Hardness: Tested according to GB / T 6739-2022 “Paints and varnishes - Determination of film hardness by pencil method”. The test results are shown in Table 1. (3) Flexibility: Tested according to GB / T 1731-1993 “Determination of paint film flexibility”. The test results are shown in Table 1. (4) Abrasion resistance: The abrasion resistance of the paint film was tested according to GB / T 17657-1999 “Test methods for physical and chemical properties of wood-based panels and veneered wood-based panels”. The test results are shown in Table 2.

[0044] As can be seen from Table 1, the paint film obtained by spraying the paint prepared in the present application has excellent mechanical properties and flexibility, and effectively alleviates the stress caused by the shrinkage and expansion of the floor, which leads to the problems of cracking, wrinkling and falling off of the paint film.

[0045] (5) Coating gloss: tested using a BGD512-60 gloss meter. The test results are shown in Table 2. (6) Antibacterial performance: According to GB / T 21866-2008 "Determination of antibacterial properties and antibacterial effects of antibacterial coatings (paint films)" and GB / T 4789.2-2016 "National food safety standard for food microbiology examination and determination of total colony count"; the test bacteria used are Escherichia coli ATCC25922 and Staphylococcus aureus; and the antibacterial rate is calculated according to the following formula: Antibacterial rate (%) = [(Nc-Ns) / Nc] × 100% Wherein, Nc-average colony count of blank control group sample after 24 hours, CFU / piece; Ns-average colony count of coating sample after 24 hours, CFU / piece; the test results are shown in Table 2; (7) Water absorption rate: The coatings prepared in Examples 5-7 and Comparative Examples 6-9 were soaked in deionized water for 24 hours and then taken out. The surface water was absorbed with filter paper and weighed. The water absorption rate η was calculated according to the following formula: η=[(m1-m0) / m0]×100% In the formula, η-water absorption rate, %; m0-weight before immersion, g; m1-weight after immersion, g; the calculation results are shown in Table 2;

[0046] It can be seen from Table 2 that the hydrophobic and wear-resistant coating prepared in the present application has high gloss and antibacterial and hydrophobic properties. Applying this coating on the surface of the wooden floor can effectively increase the service life of the wooden floor.

[0047] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor, characterized in that: The method comprises the following steps: applying a hydrophobic and wear-resistant coating on the surface of the floor, and curing the coating to obtain a solid wood floor having a hydrophobic and wear-resistant coating on the surface; The hydrophobic wear-resistant coating comprises the following raw materials in parts by weight: 75-85 parts of modified resin, 1-2 parts of wetting dispersant, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, and 10-20 parts of water; The preparation method of the modified resin comprises the following steps: S1: In a nitrogen atmosphere, add isophorone diisocyanate, polyester diol, p-hydroxyanisole, and dibutyltin dilaurate component one into a reaction kettle, control the temperature at 60-70°C, and keep the reaction warm for 1-3 hours, add hydroxyethyl acrylate and dibutyltin dilaurate component two, control the temperature at 70-80°C, and keep the reaction warm for 3-6 hours, add 3-mercapto-1-propylamine, and keep the reaction warm for 1-3 hours to obtain component one; S2: Add component 1 to the reaction bottle, adjust the pH to 6-7, add epoxy-modified porous silica, disperse evenly, control the temperature to 40-50°C, keep warm for 10-30 minutes, add hydrochloric acid to adjust the pH to 6-7, and obtain component 2; S3: Add components of di- and dodecyl tertiary amine into reactor B, disperse evenly, control the temperature at 60-70°C, keep warm for 3-6 hours, and perform vacuum distillation to obtain modified resin.

2. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: The addition ratio of isophorone diisocyanate: polyester diol: hydroxyethyl acrylate: 3-mercapto-1-propylamine in S1 is 1-2g: 10g: 0.5-1g: 0.1-0.5g.

3. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: The amount of p-hydroxyanisole added in S1 accounts for 0.03-0.06% of the total mass of isophorone diisocyanate, polyester diol and hydroxyethyl acrylate; the dibutyl tin dilaurate component one and the dibutyl tin dilaurate component two are both dibutyl tin dilaurate; the amount of dibutyl tin dilaurate added accounts for 0.1-0.3% of the total mass of isophorone diisocyanate, polyester diol and hydroxyethyl acrylate; the addition ratio of dibutyl tin dilaurate component one and dibutyl tin dilaurate component two is 1:1-1.

1.

4. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: The mass ratio of component 1 in S2 to epoxy-modified porous silica is 100:1-10.

5. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: The mass ratio of the components di- and dodecyl tertiary amine in S3 is 100:2.5-10.

6. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: The epoxy-modified porous silica is obtained by hydrolyzing and modifying the porous silica with γ-glycidyloxypropyltrimethoxysilane.

7. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: A primer layer is arranged between the floor and the hydrophobic wear-resistant coating; the primer layer is obtained by coating the primer on the surface of the floor; the primer comprises the following raw materials in weight percentage: 80-85% anionic acrylic emulsion, 0.4-1% defoamer, 0.1-0.5% wetting dispersant, 1-2% zinc stearate, 0.3-0.6% thickener, 0.5-1% 30wt% ammonia water, 1-3% tannin inhibitor, 10-13% water, and the sum of the percentages of each raw material is 100%.

8. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 6, characterized in that: The primer layer is obtained by applying the primer at least twice, and the amount of the primer applied each time is 8-15 g / m 2 .

9. The method for preparing a hydrophobic and wear-resistant coating on the surface of a solid wood floor according to claim 1, characterized in that: The hydrophobic wear-resistant coating is obtained by applying the hydrophobic wear-resistant coating at least twice, and the coating amount of the hydrophobic wear-resistant coating in a single application is 5-10 g / m 2 .

10. A hydrophobic and wear-resistant coating on the surface of a solid wood floor, characterized in that: Prepared by the preparation method described in any one of claims 1 to 9.

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