Water-resistant long-acting inorganic zinc oxide super-hydrophilic paint, preparation method and application thereof

Abstract

The disclosure relates to a field of functional coating technologies, and particularly to a durable inorganic super-hydrophilic paint, a preparation method and an application thereof. The durable inorganic super-hydrophilic paint includes the following preparation raw materials in percentage by mass: 30˜60% silicate, 5˜25% zinc oxide, 10˜40% water and 0.1˜5% wetting agent. The coating formed by a durable inorganic super-hydrophilic paint prepared by the method is a flat rigid coating, with good appearance, excellent antifouling self-cleaning and anti-microbial adhesion properties, long-term underwater stability and high mechanical strength. The paint may be applied to building external walls and home inner walls for its antifouling self-cleaning property and may be applied to a field of oil field and oil-water separation for its excellent underwater oleophobic property.

Claims

1. A water-resistant long-acting inorganic zinc oxide super-hydrophilic paint, comprising the following preparation raw materials in percentage by mass: silicate: 50%, zinc oxide: 25%, water: 24%, wetting agent: 1%.

2. The paint of claim 1, wherein, the silicate being at least one of sodium silicate, potassium silicate, sodium potassium silicate, lithium silicate and aluminum silicate.

3. The paint of claim 1, wherein, the zinc oxide being at least one of zinc oxide with a particle size of 100 μm, zinc oxide of 50 μm, zinc oxide of 500 nm, and zinc oxide of 100 nm.

4. The paint of claim 1, wherein, the wetting agent being at least one of sodium dodecyl sulfate, sodium lauryl sulfate, sodium laurate, cetyl trimethyl ammonium bromide, fatty alcohol polyoxyethylene ether and dodecyl betaine.

5. A method for preparing a water-resistant long-acting inorganic zinc oxide super-hydrophilic paint, comprising: providing preparation raw materials in percentage by mass: silicate: 50%, zinc oxide: 25%, water: 24%, and wetting agent: 1% adding the wetting agent in water to stir and mix well, adding the zinc oxide into a solution containing the wetting agent to obtain an evenly dispersed white solution, and adding silicate to stir and mix well to obtain a water-resistant long-acting inorganic zinc oxide super-hydrophilic paint.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a physical diagram of coating A.

(2) FIG. 2 is a physical diagram of coating A before (left image) and after 1000 friction cycles under a load of 100 g weight.

(3) FIG. 3 is a diagram of a super-hydrophilic contact angle of coating A, the left image being before coating and the right image being after being coating.

(4) FIG. 4 is a physical diagram of coating A after being soaked in distilled water environment for 7 days, the left image being before being soaked and the right image being after being soaked.

DETAILED DESCRIPTION

(5) The present disclosure is further described in detail below in combination with embodiments and drawings, however, implementations of the disclosure are not limited here.

(6) The reagents as used in embodiments are commercially available from the market unless otherwise noted.

(7) The durable inorganic super-hydrophilic paint in the embodiments includes the following preparation raw materials in percentage by mass:

(8) silicate: 30˜50%, zinc oxide: 15˜25°, water: 10˜30%, wetting agent: 0.5˜1.5%. The silicate is at least one of sodium silicate, potassium silicate, sodium potassium silicate, lithium silicate and aluminum silicate; preferably sodium silicate.

(9) The oxide is at least one of zinc oxide with a particle size of 100 μm, zinc oxide of 50 μm, zinc oxide of 500 nm, and zinc oxide of 100 nm5; preferably zinc oxide of 500 nm.

(10) The wetting agent is at least one of sodium dodecyl sulfate, sodium lauryl sulfate, sodium laurate, cetyl trimethyl ammonium bromide, fatty alcohol polyoxyethylene ether and dodecyl betaine; preferably sodium dodecyl sulfate; preferably sodium dodecyl sulfate.

(11) The method for preparing a durable inorganic super-hydrophilic paint in embodiments is: first adding the wetting agent in distilled water to stir and mix well, then adding the zinc oxide into a solution containing the wetting agent and stir at high speed to obtain an evenly dispersed white solution, dropwise adding the silicate to stir and mix evenly to obtain a durable inorganic super-hydrophilic paint.

Embodiment 1

(12) The embodiment provides a durable inorganic super-hydrophilic paint product having an inorganic super-hydrophilic and underwater super-oleophobic coating formed by the above inorganic super-hydrophilic paint on the surface.

(13) Four durable inorganic super-hydrophilic paints A˜D are prepared according to the proportioning ratio of Table 1; the particle size of the zinc oxide is 500 nm, and the wetting agent is sodium dodecyl sulfate.

(14) TABLE-US-00001 TABLE 1 Proportion Details of Paints A~D Component Name A B C D Sodium silicate 50% 60% 45% 50% Zinc Oxide 25% 15% 25% 25% Water 24% 24% 29% 23% Wetting Agent  1%  1%  1%  2%

(15) Paints A˜D are dip coated on a 120 mm×150 mm glass panel. The coating property is detected by first baking at a low temperature (50° C.) for 10 min and then baking at a high temperature (for example, 220° C.) for 30 min. The results are shown in Table 2.

(16) TABLE-US-00002 TABLE 2 Coating Properties Prepared by Paints A~D Coating Property A B C D coating appearance white, flat white, flat white, flat white, flat Pencil Hardness 9H 9H 9H 9H Water Contact Angle  5°  4°  6°  4° Underwater Oil Contact 156° 160° 155° 162° Angle Coating Appearance flat without flat without flat with flat After 1000 Friction scratches scratches slight without Cycles (Non-Woven scratches scratches Fabrics, 100 g Weight)

(17) From the above property detection results, the coating appearance formed by the paints A˜D is white and transparent, with qualified super hydrophilicity. The water contact angle of coating A is 5°, with a good self-cleaning property, and the coating remains intact and changed little after 1000 times of frictions, indicating that the coating has high wear resistance, and the coating remains flat and intact without powder falling off after being soaked in distilled water for 7 days, indicating that the coating has good underwater stability. It is critical to strictly control the content of the silicate in the paint system since the water resistance of coating B is lower than other samples caused by the relatively high silicate content.

(18) FIG. 1 is a physical diagram of coating A. As can be seen from the figure, the prepared durable inorganic super-hydrophilic coating forms a white coating with good appearance on a substrate and a good bonding capability for the substrate.

(19) FIG. 2 is a physical diagram of coating A before and after 1000 friction cycles under a load of 100 g weight. As can be seen from the figure, after 1000 friction cycles, the appearance remains white and flat without scratches, indicating that the coating has excellent wear resistance.

(20) FIG. 3 is a diagram of differences of contact angles before and after coating A coats on a hydrophobic stainless steel mesh. As can be seen from the figure, the water contact angle on the stainless steel net before coating is 113±6°, in a hydrophobic state, and the water contact angle on the stainless steel net after coating is almost 0°, indicating that the coating has excellent super-hydrophilic and self-cleaning properties.

(21) FIG. 4 is a physical diagram of coating A after being soaked in distilled water environment for 7 days. The coating appearance remains white and flat, and almost unchanged, indicating that coating A has good underwater stability.

(22) The above embodiments are preferred embodiments of the present disclosure, however, implementations of the invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations and simplifications not departing from the spirit and principles of the disclosure should be equivalent replacements and included in the protection scope of the present disclosure.