Waterborne polyurethane anti-static mortar floor coating and preparation method thereof
By using polydopamine-coated halloysite powder and tin-doped zinc oxide-coated titanium dioxide conductive particles, combined with rutile whiskers and a three-dimensional aerogel network, a continuous conductive network was constructed, solving the conductivity and workability issues of waterborne polyurethane antistatic coatings and achieving efficient electrostatic leakage and stable conductivity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU JINGYUE BUILDING MATERIALS TECHNOLOGY CO LTD
- Filing Date
- 2026-03-24
- Publication Date
- 2026-05-08
AI Technical Summary
Existing waterborne polyurethane antistatic coatings have difficulty balancing conductivity and workability, and suffer from problems such as discontinuous conductive networks and poor antistatic performance.
Polydopamine-coated halloysite powder and tin-doped zinc oxide-coated titanium dioxide conductive particles are used to form efficient electron channels through cross-linking reaction. Combined with rutile whiskers and a three-dimensional aerogel network, a continuous conductive network is constructed to enhance the antistatic properties of the coating.
It achieves efficient electrostatic leakage and a stable conductive network, improves the antistatic properties and mechanical stability of the coating, avoids the agglomeration and migration of conductive particles, and ensures the conductivity for long-term use.
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Figure REF-OBJ-1774341904409-000010
Abstract
Description
Technical Field
[0001] This invention belongs to the field of floor coating technology, specifically relating to a water-based polyurethane antistatic mortar floor coating and its preparation method. Background Technology
[0002] With the rapid development of high-tech industries such as electronics, precision manufacturing, semiconductors, and biomedicine, electrostatic discharge (ESD) hazards have become a key factor affecting product quality and production safety. Statistics show that the annual economic losses caused by inadequate ESD protection in my country's electronic products exceed hundreds of millions of yuan. ESD can not only lead to the breakdown and damage of microelectronic components and the malfunction of precision instruments, but also potentially cause safety accidents in flammable and explosive environments. Against this backdrop, antistatic floor coatings with high-efficiency ESD leakage capabilities are increasingly widely used in electronic factories, cleanrooms, laboratories, and other similar locations, as their performance directly affects the stability of the production process and the reliability of products.
[0003] Traditional antistatic flooring often uses solvent-based polyurethane or epoxy resin systems. While these systems offer some conductivity and mechanical strength, they suffer from high emissions of volatile organic compounds and toxic residues, severely failing to meet national green environmental protection policies and indoor air quality standards. In contrast, waterborne polyurethane coatings, using water as the dispersion medium, offer advantages such as being non-toxic and pollution-free, safe to apply, and having excellent weather resistance. They also retain the high adhesion and flexibility of solvent-based polyurethane, gradually becoming the mainstream development direction for flooring coatings. However, when combining waterborne polyurethane with antistatic functions and mortar reinforcement systems, existing waterborne polyurethane antistatic coatings primarily rely on adding conductive fillers such as carbon black, metal powder, and graphene to construct a conductive network. However, these fillers require high addition amounts to form conductive pathways, easily leading to increased coating viscosity, decreased workability, and discontinuous conductive networks, resulting in poor antistatic performance. Therefore, the market urgently needs a waterborne polyurethane antistatic mortar flooring coating that combines environmental friendliness with excellent antistatic performance. Summary of the Invention
[0004] The purpose of this invention is to provide a water-based polyurethane antistatic mortar floor coating and its preparation method, which is used to improve the antistatic performance of the water-based polyurethane mortar floor coating.
[0005] The objective of this invention can be achieved through the following technical solutions: A water-based polyurethane antistatic mortar floor coating and its preparation method, comprising the following steps: S1. Take deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer and mix them evenly to obtain component A; S2. Mix the curing agent and diluent evenly to obtain component B; S3. Take cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer and mix them evenly to obtain component C; S4. Take the plasticizer, conductive filler, antistatic additive and color paste and mix them evenly to obtain component D; S5. Mix components A and D, stir evenly, then add component B, stir evenly, then add component C, stir evenly to obtain the water-based polyurethane antistatic mortar floor coating. The antistatic additive is prepared by dispersing polydopamine-coated halloysite powder in deionized water, adding sodium alginate and tin-doped zinc oxide-coated titanium dioxide conductive particles, stirring evenly, adding a crosslinking agent to carry out a crosslinking reaction, and then vacuum freeze-drying.
[0006] As a preferred embodiment of the present invention, in step S1, the mass ratio of deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer is 19.6-30.8:1-2:68-78:0.2-0.4.
[0007] In a preferred embodiment of the present invention, in step S2, the mass ratio of the curing agent to the diluent is 5:1.
[0008] As a preferred technical solution of the present invention, in step S3, the mass ratio of cement, quartz sand, calcium hydroxide, water-reducing agent and dry powder defoamer is 20-30:40-60:5-9:0.4-0.6:1-2.
[0009] As a preferred embodiment of the present invention, in step S4, the mass ratio of the plasticizer, conductive filler, antistatic agent and color paste is 20-30: 8-10: 0.2-0.3: 50-60.
[0010] As a preferred embodiment of the present invention, in step S5, the mass ratio of component A, component B, component C, and component D is 3-5:4-5:10-15:0.7-0.8.
[0011] As a preferred embodiment of the present invention, the proportions of polydopamine-coated halloysite powder, deionized water, sodium alginate, tin-doped zinc oxide-coated titanium dioxide conductive particles, and crosslinking agent are 0.4-0.8g: 50mL: 0.2-0.3g: 0.1-0.3g: 0.2-0.4mL; the crosslinking agent is a boric acid solution with a concentration of 0.05mol / L.
[0012] A waterborne polyurethane antistatic mortar floor coating prepared by the method described above.
[0013] The beneficial effects of this invention are: The present invention discloses a waterborne polyurethane antistatic mortar floor coating and its preparation method. By constructing efficient electronic channels with conductive particles and combining the synergistic optimization of compatibility and the hygroscopic auxiliary conductivity mechanism of polydopamine-modified halloysite, the antistatic performance of the waterborne polyurethane mortar floor coating is improved. Rutile Whiskers are one-dimensional rod-shaped structures, and their high aspect ratio can serve as a conductive framework, reducing the contact resistance between conductive particles. The ZnO:Sn layer on the surface provides a large number of charge carriers to the system, significantly reducing the conductivity barrier and forming an efficient electron transport channel. The three-dimensional porous aerogel formed by freeze-drying halloysite nanotubes has a high specific surface area and a continuous pore structure, which can uniformly anchor conductive particles in the pores, preventing particle aggregation and forming a three-dimensional conductive network that runs through the entire coating. The porous structure of the aerogel also provides a buffer space for conductive particles, mitigating the breakage of the conductive network caused by coating curing shrinkage or external forces, and improving the mechanical stability of the antistatic properties. In addition, the aerogel framework can prevent the migration and shedding of conductive particles, avoiding the failure of conductive pathways during long-term use. One-dimensional The bridging effect of whiskers and the dispersing and immobilizing effect of aerogel work together to form a point-line-surface interwoven conductive network: when static electricity is generated, electrons can be rapidly transported through the free electrons in the ZnO:Sn layer, and then... The bridging effect of whiskers diffuses in the three-dimensional network, ultimately achieving efficient electrostatic leakage; After being coated with polydopamine molecular chains, halloysite-PDA composite interfaces are formed: the polar groups of PDA can form hydrogen bonds and π-π stacking interactions with the coating matrix and sodium alginate, significantly reducing the interfacial tension between inorganic halloysite and the organic matrix, allowing the aerogel carrier to be uniformly dispersed in the coating, and preventing the conductive network from being interrupted due to filler agglomeration; on the other hand, the crosslinking properties of PDA can enhance the interfacial bonding force between halloysite and conductive particles and the matrix, reduce the peeling of conductive particles from the carrier under external forces, and improve the long-term stability of the conductive network; the phenolic hydroxyl and amino groups of polydopamine are strong polar groups, which, together with the surface hydroxyl groups of halloysite itself and the porous structure of the aerogel, form a hygroscopic system with polar adsorption sites and a high specific surface area, which can adsorb trace amounts of moisture in the environment. The adsorbed moisture forms trace ion transport channels, which can promote the migration of trace ions in the coating, assist in electrostatic leakage, and achieve high efficiency and stability of antistatic performance. Detailed Implementation
[0014] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.
[0015] A method for preparing a water-based polyurethane antistatic mortar floor coating includes the following steps: S1. Take deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer and mix them evenly to obtain component A; The dispersant is selected from at least one of BYK-220S and BYK-169; The water-based castor oil modified polyol resin is selected from either YC-CY-210 (Anshan Chuangye Biomaterials Technology Co., Ltd.) or Uapoly 7140 (Liangu New Materials Technology Co., Ltd.); The defoamer is TEGO-825; S2. Mix the curing agent and diluent evenly to obtain component B; The curing agent is hexamethylene diisocyanate trimer; The diluent is propylene glycol methyl ether acetate; S3. Take cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer and mix them evenly to obtain component C; The cement is 425 Portland white cement; the quartz sand is 60-80 mesh quartz sand; the water-reducing agent is polycarboxylate superplasticizer; the dry powder defoamer is Evonik Degussa SITREN AirVoid 362 powder defoamer. S4. Take the plasticizer, conductive filler, antistatic additive and color paste and mix them evenly to obtain component D; The plasticizer is diisooctyl cyclohexanedicarboxylate; The conductive filler is an aqueous dispersion of single-walled carbon nanotubes with a mass fraction of 1.5%. The colorant is Kedi Titanium White Colorant W21-SJ; The preparation method of the antistatic additive includes the following steps: A1. Mix titanium dioxide and potassium carbonate at a mass ratio of 1.9:1, ball mill, calcine at 1000℃ for 4-6 hours, wash with 10mol / L hydrochloric acid solution for 8-12 hours, wash with water, dry, and calcine at 1000℃ for 0.5-1.5 hours to obtain rutile phase titanium dioxide whiskers; the ball milling media is zirconia balls, the ball-to-material ratio is 5:1; the ball milling speed is 300-600 r / min; the ball milling time is 4-6 hours. A2. Disperse the rutile titanium dioxide whiskers in deionized water, add sodium hexametaphosphate, adjust the pH to 8-9, and stir at 60℃ for 1-2 hours to obtain a dispersion. Dissolve tin chloride pentahydrate and zinc chloride in a 2 mol / L hydrochloric acid solution, and add them dropwise to the above dispersion while stirring, keeping the pH at 8-9. After the addition is complete, age for 3-5 hours, filter, wash the solid phase, dry, and calcine at 550-650℃ for 1-2 hours to obtain tin-doped zinc oxide-coated titanium dioxide conductive particles. The ratio of the rutile titanium dioxide whiskers, deionized water, sodium hexametaphosphate, tin chloride pentahydrate, zinc chloride, and hydrochloric acid solution is 2.2g:100mL:0.033g:0.17g:0.81g:10mL. A3. Halloysite nanotubes were ultrasonically dispersed in Tris-HCl buffer (10 mmol / L, pH=8.5), dopamine hydrochloride was added, and the mixture was stirred at 50℃ for 24 h. The mixture was then filtered, the solid phase was washed, and dried to obtain polydopamine-coated halloysite powder. The ratio of halloysite nanotubes, Tris-HCl buffer, and dopamine hydrochloride was 1-2 g: 100 mL: 0.2-0.4 g. A4. Disperse the polydopamine-coated halloysite powder in deionized water, heat to 60°C, add sodium alginate and conductive particles, stir evenly, then cool to 30-40°C, add boric acid solution to carry out cross-linking reaction for 2-4 hours, and transfer to a mold. The antistatic additive is obtained by freeze-drying at -30℃ and 10Pa vacuum for 10-20 hours; the ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, conductive particles, and boric acid solution is 0.4-0.8g: 50mL: 0.2-0.3g: 0.1-0.3g: 0.2-0.4mL; the concentration of boric acid solution is 0.05mol / L.
[0016] S5. Mix components A and D, stir evenly, then add component B and stir for 1-2 minutes. Add component C and stir for 3-5 minutes to obtain the water-based polyurethane antistatic mortar floor coating. In step S1, the mass ratio of deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer is 19.6-30.8:1-2:68-78:0.2-0.4; In step S2, the mass ratio of the curing agent to the diluent is 5:1; In step S3, the mass ratio of cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer is 20-30:40-60:5-9:0.4-0.6:1-2; In step S4, the mass ratio of the plasticizer, conductive filler, antistatic agent and color paste is 20-30: 8-10: 0.2-0.3: 50-60; In step S5, the mass ratio of component A, component B, component C, and component D is 3-5:4-5:10-15:0.7-0.8. Example 1
[0017] A method for preparing a water-based polyurethane antistatic mortar floor coating includes the following steps: S1. Take deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer and mix them evenly to obtain component A; The dispersant is selected from BYK-220S; The water-based castor oil modified polyol resin is selected from YC-CY-210 (Anshan Chuangye Biomaterials Technology Co., Ltd.). The defoamer is TEGO-825; S2. Mix the curing agent and diluent evenly to obtain component B; The curing agent is hexamethylene diisocyanate trimer; The diluent is propylene glycol methyl ether acetate; S3. Take cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer and mix them evenly to obtain component C; The cement is 425 Portland white cement; the quartz sand is 60 mesh quartz sand; the water-reducing agent is polycarboxylate superplasticizer; the dry powder defoamer is Evonik Degussa SITREN AirVoid 362 powder defoamer. S4. Take the plasticizer, conductive filler, antistatic additive and color paste and mix them evenly to obtain component D; The plasticizer is diisooctyl cyclohexanedicarboxylate; The conductive filler is an aqueous dispersion of single-walled carbon nanotubes with a mass fraction of 1.5%. The colorant is Kedi Titanium White Colorant W21-SJ; The preparation method of the antistatic additive includes the following steps: A1. Titanium dioxide and potassium carbonate were mixed at a mass ratio of 1.9:1, ball-milled, calcined at 1000℃ for 4 hours, washed with 10mol / L hydrochloric acid solution for 8 hours, washed with water, dried, and calcined at 1000℃ for 0.5 hours to obtain rutile phase titanium dioxide whiskers; the ball milling media was zirconia balls, the ball-to-material ratio was 5:1; the ball milling speed was 300 r / min; the ball milling time was 4 hours. A2. Disperse the rutile titanium dioxide whiskers in deionized water, add sodium hexametaphosphate, adjust the pH to 8, and stir at 60℃ for 1 hour to obtain a dispersion. Dissolve tin chloride pentahydrate and zinc chloride in a 2 mol / L hydrochloric acid solution, and add them dropwise to the above dispersion while stirring, keeping the pH at 8. After the addition is complete, age for 3 hours, filter, wash the solid phase, dry, and calcine at 550℃ for 1 hour to obtain tin-doped zinc oxide-coated titanium dioxide conductive particles. The ratio of the rutile titanium dioxide whiskers, deionized water, sodium hexametaphosphate, tin chloride pentahydrate, zinc chloride, and hydrochloric acid solution is 2.2 g: 100 mL: 0.033 g: 0.17 g: 0.81 g: 10 mL. A3. Halloysite nanotubes were ultrasonically dispersed in Tris-HCl buffer (10 mmol / L, pH=8.5), dopamine hydrochloride was added, and the mixture was stirred at 50℃ for 24 h. The mixture was then filtered, the solid phase was washed, and dried to obtain polydopamine-coated halloysite powder. The ratio of halloysite nanotubes, Tris-HCl buffer, and dopamine hydrochloride was 1 g: 100 mL: 0.2 g. A4. Disperse the polydopamine-coated halloysite powder in deionized water, heat to 60°C, add sodium alginate and conductive particles, stir evenly, then cool to 30°C, add boric acid solution to carry out crosslinking reaction for 2 hours, and transfer to a mold. The antistatic additive was obtained by freeze-drying at -30℃ and 10Pa vacuum for 10 hours. The ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, conductive particles, and boric acid solution was 0.4g:50mL:0.2g:0.1g:0.2mL. The concentration of the boric acid solution was 0.05mol / L.
[0018] S5. Mix components A and D, stir evenly, then add component B and stir for 1 minute. Add component C and stir for 3 minutes to obtain the water-based polyurethane antistatic mortar floor coating. In step S1, the mass ratio of deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer is 30.8:1:68:0.2. In step S2, the mass ratio of the curing agent to the diluent is 5:1; In step S3, the mass ratio of cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer is 20:60:5:0.4:1; In step S4, the mass ratio of the plasticizer, conductive filler, antistatic agent and color paste is 20:8:0.2:60; In step S5, the mass ratio of component A, component B, component C, and component D is 3:4:10:0.7. Example 2
[0019] A method for preparing a water-based polyurethane antistatic mortar floor coating includes the following steps: S1. Take deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer and mix them evenly to obtain component A; The dispersant is selected from BYK-169; The water-based castor oil modified polyol resin is selected from YC-CY-210 (Anshan Chuangye Biomaterials Technology Co., Ltd.). The defoamer is TEGO-825; S2. Mix the curing agent and diluent evenly to obtain component B; The curing agent is hexamethylene diisocyanate trimer; The diluent is propylene glycol methyl ether acetate; S3. Take cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer and mix them evenly to obtain component C; The cement is 425 Portland white cement; the quartz sand is 70 mesh quartz sand; the water-reducing agent is polycarboxylate superplasticizer; the dry powder defoamer is Evonik Degussa SITREN AirVoid 362 powder defoamer. S4. Take the plasticizer, conductive filler, antistatic additive and color paste and mix them evenly to obtain component D; The plasticizer is diisooctyl cyclohexanedicarboxylate; The conductive filler is an aqueous dispersion of single-walled carbon nanotubes with a mass fraction of 1.5%. The colorant is Kedi Titanium White Colorant W21-SJ; The preparation method of the antistatic additive includes the following steps: A1. Titanium dioxide and potassium carbonate were mixed at a mass ratio of 1.9:1, ball-milled, and calcined at 1000℃ for 5 hours. The mixture was then washed with a 10 mol / L hydrochloric acid solution for 10 hours, washed with water, dried, and calcined at 1000℃ for 1 hour to obtain rutile phase titanium dioxide whiskers. The ball milling media used were zirconia balls, with a ball-to-material ratio of 5:1; the ball milling speed was 450 r / min; and the ball milling time was 5 hours. A2. Disperse the rutile titanium dioxide whiskers in deionized water, add sodium hexametaphosphate, adjust the pH to 9, and stir at 60℃ for 1.5h to obtain a dispersion. Dissolve tin chloride pentahydrate and zinc chloride in a 2mol / L hydrochloric acid solution, and add them dropwise to the above dispersion while stirring, keeping the pH at 9. After the addition is complete, age for 4h, filter, wash the solid phase, dry, and calcine at 600℃ for 1.5h to obtain tin-doped zinc oxide-coated titanium dioxide conductive particles. The ratio of the rutile titanium dioxide whiskers, deionized water, sodium hexametaphosphate, tin chloride pentahydrate, zinc chloride, and hydrochloric acid solution is 2.2g:100mL:0.033g:0.17g:0.81g:10mL. A3. Halloysite nanotubes were ultrasonically dispersed in Tris-HCl buffer (10 mmol / L, pH=8.5), dopamine hydrochloride was added, and the mixture was stirred at 50℃ for 24 h. The mixture was then filtered, the solid phase was washed, and dried to obtain polydopamine-coated halloysite powder. The ratio of halloysite nanotubes, Tris-HCl buffer, and dopamine hydrochloride was 1.5 g: 100 mL: 0.3 g. A4. Disperse the polydopamine-coated halloysite powder in deionized water, heat to 60°C, add sodium alginate and conductive particles, stir evenly, then cool to 35°C, add boric acid solution to carry out cross-linking reaction for 3 hours, and transfer to a mold. The antistatic additive was obtained by freeze-drying at -30℃ and 10Pa vacuum for 15h; the ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, conductive particles, and boric acid solution was 0.6g:50mL:0.25g:0.2g:0.3mL; and the concentration of boric acid solution was 0.05mol / L.
[0020] S5. Mix components A and D, stir evenly, then add component B and stir for 1.5 minutes. Add component C and stir for 4 minutes to obtain the water-based polyurethane antistatic mortar floor coating. In step S1, the mass ratio of deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer is 25.2:1.5:73:0.3. In step S2, the mass ratio of the curing agent to the diluent is 5:1; In step S3, the mass ratio of cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer is 25:50:7:0.5:1.5; In step S4, the mass ratio of the plasticizer, conductive filler, antistatic agent and color paste is 25:9:0.25:55; In step S5, the mass ratio of component A, component B, component C, and component D is 4:5:12:0.75. Example 3
[0021] A method for preparing a water-based polyurethane antistatic mortar floor coating includes the following steps: S1. Take deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer and mix them evenly to obtain component A; The dispersant is selected from BYK-220S; The water-based castor oil modified polyol resin is selected from Uapoly 7140 (Liangu New Materials Technology Co., Ltd.). The defoamer is TEGO-825; S2. Mix the curing agent and diluent evenly to obtain component B; The curing agent is hexamethylene diisocyanate trimer; The diluent is propylene glycol methyl ether acetate; S3. Take cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer and mix them evenly to obtain component C; The cement is 425 Portland white cement; the quartz sand is 80 mesh quartz sand; the water-reducing agent is polycarboxylate superplasticizer; the dry powder defoamer is Evonik Degussa SITREN AirVoid 362 powder defoamer. S4. Take the plasticizer, conductive filler, antistatic additive and color paste and mix them evenly to obtain component D; The plasticizer is diisooctyl cyclohexanedicarboxylate; The conductive filler is an aqueous dispersion of single-walled carbon nanotubes with a mass fraction of 1.5%. The colorant is Kedi Titanium White Colorant W21-SJ; The preparation method of the antistatic additive includes the following steps: A1. Titanium dioxide and potassium carbonate were mixed at a mass ratio of 1.9:1, ball-milled, and calcined at 1000℃ for 6 hours. The mixture was then washed with a 10 mol / L hydrochloric acid solution for 12 hours, washed with water, dried, and calcined at 1000℃ for 1.5 hours to obtain rutile phase titanium dioxide whiskers. The ball milling media used were zirconia balls, with a ball-to-material ratio of 5:1; the ball milling speed was 600 r / min; and the ball milling time was 6 hours. A2. Disperse the rutile titanium dioxide whiskers in deionized water, add sodium hexametaphosphate, adjust the pH to 9, and stir at 60℃ for 2 hours to obtain a dispersion. Dissolve tin chloride pentahydrate and zinc chloride in a 2 mol / L hydrochloric acid solution, and add them dropwise to the above dispersion while stirring, keeping the pH at 9. After the addition is complete, age for 5 hours, filter, wash the solid phase, dry, and calcine at 650℃ for 2 hours to obtain tin-doped zinc oxide-coated titanium dioxide conductive particles. The ratio of the rutile titanium dioxide whiskers, deionized water, sodium hexametaphosphate, tin chloride pentahydrate, zinc chloride, and hydrochloric acid solution is 2.2 g: 100 mL: 0.033 g: 0.17 g: 0.81 g: 10 mL. A3. Halloysite nanotubes were ultrasonically dispersed in Tris-HCl buffer (10 mmol / L, pH=8.5), dopamine hydrochloride was added, and the mixture was stirred at 50℃ for 24 h. The mixture was then filtered, the solid phase was washed, and dried to obtain polydopamine-coated halloysite powder. The ratio of halloysite nanotubes, Tris-HCl buffer, and dopamine hydrochloride was 2 g: 100 mL: 0.4 g. A4. Disperse the polydopamine-coated halloysite powder in deionized water, heat to 60°C, add sodium alginate and conductive particles, stir evenly, then cool to 40°C, add boric acid solution to carry out cross-linking reaction for 4 hours, and transfer to a mold. The antistatic additive was obtained by freeze-drying at -30℃ and 10Pa vacuum for 20h; the ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, conductive particles, and boric acid solution was 0.8g:50mL:0.3g:0.3g:0.4mL; and the concentration of the boric acid solution was 0.05mol / L.
[0022] S5. Mix components A and D, stir evenly, then add component B and stir for 2 minutes. Add component C and stir for 5 minutes to obtain the water-based polyurethane antistatic mortar floor coating. In step S1, the mass ratio of deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer is 19.6:2:78:0.4. In step S2, the mass ratio of the curing agent to the diluent is 5:1; In step S3, the mass ratio of cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer is 30:60:9:0.6:2; In step S4, the mass ratio of the plasticizer, conductive filler, antistatic agent and color paste is 30:10:0.3:60; In step S5, the mass ratio of component A, component B, component C, and component D is 5:5:15:0.8.
[0023] Comparative Example 1 The difference from Example 2 is that the preparation method of the antistatic additive includes the following steps: A1. Titanium dioxide and potassium carbonate are mixed at a mass ratio of 1.9:1, ball-milled, calcined at 1000℃ for 5 hours, washed with 10mol / L hydrochloric acid solution for 10 hours, washed with water, dried, and calcined at 1000℃ for 1 hour to obtain rutile phase titanium dioxide whiskers as conductive particles; the ball milling medium is zirconia balls, the ball-to-material ratio is 5:1; the ball milling speed is 450 r / min; the ball milling time is 5 hours. A2. Halloysite nanotubes were ultrasonically dispersed in Tris-HCl buffer (10 mmol / L, pH=8.5), dopamine hydrochloride was added, and the mixture was stirred at 50℃ for 24 h. The mixture was then filtered, the solid phase was washed, and dried to obtain polydopamine-coated halloysite powder. The ratio of halloysite nanotubes, Tris-HCl buffer, and dopamine hydrochloride was 1.5 g: 100 mL: 0.3 g. A3. Disperse the polydopamine-coated halloysite powder in deionized water, heat to 60°C, add sodium alginate and conductive particles, stir evenly, then cool to 35°C, add boric acid solution to carry out crosslinking reaction for 3 hours, and transfer to a mold. The antistatic additive was obtained by freeze-drying at -30℃ and 10Pa vacuum for 15h; the ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, conductive particles, and boric acid solution was 0.6g:50mL:0.25g:0.2g:0.3mL; and the concentration of boric acid solution was 0.05mol / L.
[0024] Comparative Example 2 The difference from Example 2 is that the preparation method of the antistatic additive includes the following steps: A1. Titanium dioxide and potassium carbonate were mixed at a mass ratio of 1.9:1, ball-milled, and calcined at 1000℃ for 5 hours. The mixture was then washed with a 10 mol / L hydrochloric acid solution for 10 hours, washed with water, dried, and calcined at 1000℃ for 1 hour to obtain rutile phase titanium dioxide whiskers. The ball milling media used were zirconia balls, with a ball-to-material ratio of 5:1; the ball milling speed was 450 r / min; and the ball milling time was 5 hours. A2. Disperse the rutile titanium dioxide whiskers in deionized water, add sodium hexametaphosphate, adjust the pH to 9, and stir at 60℃ for 1.5h to obtain a dispersion. Dissolve tin chloride pentahydrate and zinc chloride in a 2mol / L hydrochloric acid solution, and add them dropwise to the above dispersion while stirring, keeping the pH at 9. After the addition is complete, age for 4h, filter, wash the solid phase, dry, and calcine at 600℃ for 1.5h to obtain tin-doped zinc oxide-coated titanium dioxide conductive particles. The ratio of the rutile titanium dioxide whiskers, deionized water, sodium hexametaphosphate, tin chloride pentahydrate, zinc chloride, and hydrochloric acid solution is 2.2g:100mL:0.033g:0.17g:0.81g:10mL. A3. Disperse halloysite nanotube powder in deionized water, heat to 60℃, add sodium alginate and conductive particles, stir evenly, then cool to 35℃, add boric acid solution to carry out cross-linking reaction for 3 hours, and transfer to a mold. The antistatic additive was obtained by freeze-drying at -30℃ and 10Pa vacuum for 15h; the ratio of halloysite nanotube powder, deionized water, sodium alginate, conductive particles and boric acid solution was 0.6g:50mL:0.25g:0.2g:0.3mL; the concentration of boric acid solution was 0.05mol / L.
[0025] Comparative Example 3 The difference from Example 2 is that the preparation method of the antistatic additive includes the following steps: A1. Titanium dioxide and potassium carbonate were mixed at a mass ratio of 1.9:1, ball-milled, and calcined at 1000℃ for 5 hours. The mixture was then washed with a 10 mol / L hydrochloric acid solution for 10 hours, washed with water, dried, and calcined at 1000℃ for 1 hour to obtain rutile phase titanium dioxide whiskers. The ball milling media used were zirconia balls, with a ball-to-material ratio of 5:1; the ball milling speed was 450 r / min; and the ball milling time was 5 hours. A2. Disperse the rutile titanium dioxide whiskers in deionized water, add sodium hexametaphosphate, adjust the pH to 9, and stir at 60℃ for 1.5h to obtain a dispersion. Dissolve tin chloride pentahydrate and zinc chloride in a 2mol / L hydrochloric acid solution, and add them dropwise to the above dispersion while stirring, keeping the pH at 9. After the addition is complete, age for 4h, filter, wash the solid phase, dry, and calcine at 600℃ for 1.5h to obtain tin-doped zinc oxide-coated titanium dioxide conductive particles. The ratio of the rutile titanium dioxide whiskers, deionized water, sodium hexametaphosphate, tin chloride pentahydrate, zinc chloride, and hydrochloric acid solution is 2.2g:100mL:0.033g:0.17g:0.81g:10mL. A3. Halloysite nanotubes were ultrasonically dispersed in Tris-HCl buffer (10 mmol / L, pH=8.5), dopamine hydrochloride was added, and the mixture was stirred at 50℃ for 24 h. The mixture was then filtered, the solid phase was washed, and dried to obtain polydopamine-coated halloysite powder. The ratio of halloysite nanotubes, Tris-HCl buffer, and dopamine hydrochloride was 1.5 g: 100 mL: 0.3 g. A4. Disperse the polydopamine-coated halloysite powder in deionized water, add conductive particles, stir ultrasonically until homogeneous, filter, and dry the solid phase to obtain the antistatic additive; the ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, conductive particles, and boric acid solution is 0.6g:50mL:0.25g:0.2g:0.3mL; the concentration of the boric acid solution is 0.05mol / L.
[0026] Performance testing According to standard GB / T 22374-2018 Floor Coating Materials, the performance of the floor coatings prepared in Examples 1-3 and Comparative Examples 1-3 was tested, and the test results are shown in Table 1 below: Table 1 As shown in Table 1, the waterborne polyurethane mortar floor coatings prepared in Examples 1-3 of this invention have good antistatic properties. In Comparative Example 1, the zinc oxide coating without tin doping and the use of only titanium dioxide whiskers as conductive particles resulted in poor conductivity, resistance values far exceeding the acceptable range, and a deterioration in antistatic effect. In Comparative Example 2, the halloysite nanotubes without polydopamine coating had poor compatibility with conductive particles and sodium alginate matrix, poor hygroscopicity, discontinuous conductive network, and extremely fluctuating resistance values, resulting in poor stability. In Comparative Example 3, the antistatic additive lacked a three-dimensional cross-linked structure, making it easy for conductive particles to migrate and detach. After resistance to the medium, the resistance increased sharply, and the antistatic performance deteriorated.
[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A method for preparing a water-based polyurethane antistatic mortar floor coating, characterized in that, Includes the following steps: S1. Take deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer and mix them evenly to obtain component A; S2. Mix the curing agent and diluent evenly to obtain component B; S3. Take cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer and mix them evenly to obtain component C; S4. Take the plasticizer, conductive filler, antistatic additive and color paste and mix them evenly to obtain component D; S5. Mix components A and D, stir evenly, then add component B, stir evenly, then add component C, stir evenly to obtain the water-based polyurethane antistatic mortar floor coating. The antistatic additive is prepared by dispersing polydopamine-coated halloysite powder in deionized water, adding sodium alginate and tin-doped zinc oxide-coated titanium dioxide conductive particles, stirring evenly, adding a crosslinking agent to carry out a crosslinking reaction, and then vacuum freeze-drying.
2. The preparation method of a waterborne polyurethane antistatic mortar floor coating according to claim 1, characterized in that, In step S1, the mass ratio of deionized water, dispersant, water-based castor oil modified polyol resin, and defoamer is 19.6-30.8:1-2:68-78:0.2-0.
4.
3. The preparation method of a waterborne polyurethane antistatic mortar floor coating according to claim 1, characterized in that, In step S2, the mass ratio of the curing agent to the diluent is 5:
1.
4. The preparation method of a water-based polyurethane antistatic mortar floor coating according to claim 1, characterized in that, In step S3, the mass ratio of cement, quartz sand, calcium hydroxide, water-reducing agent, and dry powder defoamer is 20-30:40-60:5-9:0.4-0.6:1-2.
5. The preparation method of a waterborne polyurethane antistatic mortar floor coating according to claim 1, characterized in that, In step S4, the mass ratio of the plasticizer, conductive filler, antistatic agent and color paste is 20-30: 8-10: 0.2-0.3: 50-60.
6. The method for preparing a waterborne polyurethane antistatic mortar floor coating according to claim 1, characterized in that, In step S5, the mass ratio of component A, component B, component C, and component D is 3-5:4-5:10-15:0.7-0.
8.
7. The preparation method of a waterborne polyurethane antistatic mortar floor coating according to claim 1, characterized in that, The ratio of polydopamine-coated halloysite powder, deionized water, sodium alginate, tin-doped zinc oxide-coated titanium dioxide conductive particles, and crosslinking agent is 0.4-0.8g: 50mL: 0.2-0.3g: 0.1-0.3g: 0.2-0.4mL; the crosslinking agent is a boric acid solution with a concentration of 0.05mol / L.
8. A waterborne polyurethane antistatic mortar floor coating prepared by the preparation method according to any one of claims 1-7.