CN114437576A - Nano silicon negative ion coating and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of paint manufacturing, in particular to a nano silicon negative ion paint and a preparation method thereof. The nano silicon negative ion coating is suitable for walls, especially the wall surfaces of highway tunnels in severe environments, has the advantages of high surface hardness, fire resistance, flame retardance and negative ion release, is environment-friendly, green, self-cleaning and stain-resistant, and has high practical value and good application prospect.

Description

Nano silicon negative ion coating and preparation method thereof

Technical Field

The invention relates to the technical field of paint manufacturing, in particular to a nano silicon negative ion paint.

Background

On one hand, the anion is called as air vitamin, and the excellent air purifying capacity makes the anion be related to families, hospitals and fields. The anion paint is popular with researchers in recent years, wherein the anion material is mainly divided into commercially available anion powder, modified composite diatomite, modified tourmaline and the like. Anion powder and derivative products thereof are purchased in the early period, the release amount of anions is much concerned, and the radioactivity is often ignored. Research shows that most negative ion water in the market is mainly prepared from thorium nitrate solution containing radiation, and most ore negative ion powder has radioactivity to different degrees.

On the other hand, the organic silicon coating is a coating which takes an organic silicon polymer or a modified polymer thereof as a main film forming substance, has special functions of excellent cold resistance, corona resistance, radiation resistance, hydrophobicity, electrical insulation, elasticity and the like, and is rapidly developed in the aspects of modification and application of products in recent years. The organic silicon coating is divided into a solvent type and a non-solvent type, the solvent type is gradually eliminated due to the environmental protection problem and is forbidden to be used, wherein the non-solvent organic silicon coating mainly comprises a weather-resistant anti-cracking organic silicon fireproof coating and an organic silicon flame-retardant fireproof coating, but the weather resistance and the temperature change resistance in a high-temperature environment are poor, the fire resistance is improved only by adding a flame retardant in the fire resistance aspect, the cost is increased, and toxic smoke is also generated to harm human health.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a nano silicon negative ion coating and a preparation method thereof, and the prepared coating has the beneficial effects of high surface hardness, fire resistance, flame retardance and negative ion release, is environment-friendly, green, self-cleaning and stain-resistant, and has higher practical value and good application prospect.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the invention provides a nano silicon negative ion coating which comprises the following raw materials in parts by weight:

25-35 parts of conjugated binuclear inorganic nano-silicon film forming liquid, 25-30 parts of deionized water, 0.5-1 part of anion powder, 0.2-0.3 part of silane coupling agent, 0.06-0.1 part of heptadecafluorodecyltrimethoxysilane, 4-6 parts of kaolin, 11-15 parts of titanium dioxide, 13-17 parts of coarse whiting powder, 2-5 parts of silicon dioxide powder, 0.3-0.6 part of dispersing agent, 0.2-0.5 part of wetting agent, 0.3-0.6 part of thickening agent, 0.3-0.6 part of defoaming agent and 0.2-0.6 part of multifunctional auxiliary agent.

Preferably, the multifunctional auxiliary agent is American Dow AMP-95, and the dispersing agent is SN-5040 of Santa Clara, Japan; the wetting agent is Dow LF-45; the thickener is Shanghai Tongyang TH-30; the antifoaming agent is Basff ST-2410.

Preferably, the conjugated binuclear inorganic nano-silicon film-forming solution is prepared by the following method, including:

mixing a sodium silicate solution and a potassium silicate solution according to a weight ratio of 1:3, stirring for 40-60 minutes at the rotation speed of 1500-1800 rpm and the frequency of 60-100Hz under the condition of 40-60 ℃, then reducing to 700-900 rpm, dripping silica sol with the same weight as the sodium silicate solution, and continuing stirring for 60 minutes.

Preferably, the solid content of the sodium silicate solution is 40-50%, the solid content of the potassium silicate solution is 26-28%, and the solid content of the silica sol is 23-25%.

Preferably, the anion powder is prepared by the following method, including:

soaking medical stone and tourmaline into 6mol/L hydrochloric acid according to the weight ratio of 1:3 for 2-8 h, washing with water for 3-5 times, drying and grinding at 105 ℃ to obtain powder, adding 1-5g of powder into every 20-50ml of titanium dioxide sol, uniformly dispersing the powder into transparent titanium dioxide sol at the stirring speed of 800 revolutions per minute, then carrying out suction filtration, drying at 100 ℃, grinding to obtain powder, calcining at the high temperature of 800 ℃ in a muffle furnace for 2-4h, cooling, crushing and grinding.

The invention also provides a method for preparing the nano silicon negative ion coating, which comprises the following steps:

mixing deionized water, a dispersing agent, a wetting agent, a thickening agent and a defoaming agent, dispersing at a high speed for 10-15 minutes, respectively dropwise adding a silane coupling agent and heptadecafluorodecyltrimethoxysilane, continuously dispersing for 150-180 minutes, sequentially adding kaolin, titanium dioxide, coarse whiting powder, silicon dioxide powder and negative oxygen ion powder, continuously dispersing for 10-30 minutes, adding the conjugated binuclear nano-silicon film forming solution, dispersing for 30-50 minutes, and then adding a multifunctional auxiliary agent, and dispersing for 10-15 minutes.

Preferably, the rotating speed of the high-speed dispersion is 1200 r/min, and the dropping speed of the silane coupling agent and the heptadecafluorodecyltrimethoxysilane is 0.5 kg/min.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the sodium silicate and the potassium silicate form a binuclear conjugate, and the binuclear conjugate and the silica sol form an inorganic nano conjugate emulsion, so that the defects of low viscosity and poor water resistance of the sodium silicate are overcome, the film forming effect of the traditional emulsion is achieved, and the film forming hardness of the coating is improved; adding acid treated TiO into the system₂The negative ion powder loading the medical stone tourmaline forms a porous micro-capacitance structure through calcination treatment, so that the gaps and the surface area of particles are increased, negative ions can be continuously released, and the contamination resistance of the surface of the coating is greatly improved; the addition of the titanium dioxide, kaolin, silicon dioxide powder and other fillers improves the weather resistance, acid and alkali resistance and easy workability of the coating, reduces the permeability of the coating and enhances the durability of the coating. The nano silicon negative ion coating has the functions of inorganic coating, self-cleaning coating and negative ion coating, widens the application field of silicon-based coating, and is particularly suitable for highway tunnels with severe environment.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1.

The nano silicon negative ion coating comprises the following raw materials in parts by weight:

35 parts of conjugated dual-core inorganic nano-silicon film forming liquid, 25 parts of deionized water, 0.5 part of anion powder, 0.2 part of silane coupling agent, 0.1 part of heptadecafluorodecyl trimethoxy silane, 5 parts of kaolin, 12 parts of titanium dioxide, 15 parts of heavy calcium powder, 5 parts of silicon dioxide powder, 0.3 part of dispersing agent, 0.2 part of wetting agent, 0.4 part of thickening agent, 0.3 part of defoaming agent and 0.5 part of multifunctional auxiliary agent.

The multifunctional auxiliary agent in the embodiment is American Dow AMP-95, and the dispersant is SN-5040 of Santa Clara, Japan; the wetting agent is Dow LF-45; the thickener is Shanghai Tongyang TH-30; the antifoaming agent is Basff ST-2410.

The preparation method of the conjugated dual-core inorganic nano-silicon film-forming solution in the embodiment specifically comprises the following steps:

stirring a sodium silicate solution with the solid content of 45 percent accounting for 20 percent of the weight and a potassium silicate solution with the solid content of 26 percent accounting for 60 percent of the weight for 60 minutes under the ultrasonic condition of 50 ℃ at the rotating speed of 1600 rpm and the frequency of 60Hz, then reducing the rotating speed to 800 rpm, dropwise adding silica sol with the solid content of 25 percent accounting for 20 percent of the weight, and stirring for 60 minutes to obtain the conjugated dual-core inorganic nano-silicon film forming solution.

The preparation method of the anion powder in the embodiment specifically comprises the following steps:

soaking medical stone and tourmaline into 6mol/L hydrochloric acid according to the weight ratio of 1:3 for 6h, washing with water for 3 times, drying and grinding at 105 ℃ to obtain powder, uniformly dispersing the powder in transparent titanium dioxide sol, adding 3g of powder into every 30ml of titanium dioxide sol, stirring at 800 r/min, suction filtering, drying at 100 ℃, grinding to obtain powder, calcining at 600 ℃ for 2h in a muffle furnace, cooling, crushing and grinding to obtain the anion powder.

The preparation method of the nano silicon anion coating in the embodiment comprises the following steps:

weighing and preparing raw materials of each component according to requirements;

step two, mixing deionized water, a dispersing agent, a wetting agent, a thickening agent and a defoaming agent, dispersing for 10 minutes at a high speed, respectively dropwise adding a silane coupling agent and heptadecafluorodecyltrimethoxysilane at a high-speed dispersion rotating speed of 1200 r/min, wherein the dropwise adding speed of the silane coupling agent and the heptadecafluorodecyltrimethoxysilane is 0.5 kg/min, and continuously dispersing for 150 minutes;

and step three, sequentially adding kaolin, titanium dioxide, coarse whiting powder, silicon dioxide powder and negative oxygen ion powder into the mixed solution obtained in the step two, continuing to disperse for 30 minutes, adding the conjugated binuclear nano-silicon film forming solution, dispersing for 30 minutes, and then adding the multifunctional auxiliary agent, and dispersing for 15 minutes to obtain the nano-silicon negative ion coating.

In order to verify the performance of the nano silicon anion coating prepared in this example, the coating in this example is tested, and the specific test results are shown in table 1 below:

TABLE 1

Detecting items	The result of the detection
		Drying time (watch dry)	35min
Stain resistance (white and light color)	4％
		Alkali resistance	720h has no abnormal condition
Water resistance	720h has no abnormal condition
		Temperature change resistance of coating	5 cycles without abnormality
Resistance to artificial weathering	3000h
		Washing and brushing resistance	10000 times of no-exposed bottom
Acid resistance	720h has no abnormal condition
		Antibacterial properties	99.99% (in accordance with I grade)
Anti-mould performance	Grade 0 (conformity I grade)
		Amount of negative ion released	2955 pieces/cm3

Example 2.

The nano silicon negative ion coating comprises the following raw materials in parts by weight:

30 parts of conjugated binuclear inorganic nano-silicon film forming liquid, 30 parts of deionized water, 0.5 part of anion powder, 0.2 part of silane coupling agent, 0.1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of kaolin, 12.5 parts of titanium dioxide, 15 parts of heavy calcium powder, 5 parts of silicon dioxide powder, 0.3 part of dispersing agent, 0.2 part of wetting agent, 0.4 part of thickening agent, 0.3 part of defoaming agent and 0.5 part of multifunctional auxiliary agent.

The multifunctional auxiliary agent in the embodiment is American Dow AMP-95, and the dispersant is SN-5040 of Santa Clara, Japan; the wetting agent is Dow LF-45; the thickener is Shanghai Tongyang TH-30; the antifoaming agent is Basff ST-2410.

The preparation method of the conjugated dual-core inorganic nano-silicon film-forming solution in the embodiment specifically comprises the following steps:

stirring a sodium silicate solution with the solid content of 45 percent accounting for 20 percent of the weight and a potassium silicate solution with the solid content of 26 percent accounting for 60 percent of the weight for 60 minutes under the ultrasonic condition of 50 ℃ at the rotating speed of 1600 rpm and the frequency of 60Hz, then reducing the rotating speed to 800 rpm, dropwise adding silica sol with the solid content of 25 percent accounting for 20 percent of the weight, and stirring for 60 minutes to obtain the conjugated dual-core inorganic nano-silicon film forming solution.

The preparation method of the anion powder in the embodiment specifically comprises the following steps:

soaking medical stone and tourmaline into 6mol/L hydrochloric acid according to the weight ratio of 1:3 for 6h, washing with water for 3 times, drying and grinding at 105 ℃ to obtain powder, uniformly dispersing the powder in transparent titanium dioxide sol, adding 3g of powder into every 30ml of titanium dioxide sol, stirring at 800 r/min, suction filtering, drying at 100 ℃, grinding to obtain powder, calcining at 600 ℃ for 2h in a muffle furnace, cooling, crushing and grinding to obtain the anion powder.

The preparation method of the nano silicon anion coating in the embodiment comprises the following steps:

weighing and preparing raw materials of each component according to requirements;

step two, mixing deionized water, a dispersing agent, a wetting agent, a thickening agent and a defoaming agent, dispersing for 10 minutes at a high speed, respectively dropwise adding a silane coupling agent and heptadecafluorodecyltrimethoxysilane at a high-speed dispersion rotating speed of 1200 r/min, wherein the dropwise adding speed of the silane coupling agent and the heptadecafluorodecyltrimethoxysilane is 0.5 kg/min, and continuously dispersing for 150 minutes;

and step three, sequentially adding kaolin, titanium dioxide, coarse whiting powder, silicon dioxide powder and negative oxygen ion powder into the mixed solution obtained in the step two, continuing to disperse for 10 minutes, adding the conjugated binuclear nano-silicon film forming solution, dispersing for 30 minutes, and then adding the multifunctional auxiliary agent, and dispersing for 10 minutes to obtain the nano-silicon negative ion coating.

In order to verify the performance of the nano silicon anion coating prepared in this example, the coating in this example is tested, and the specific test results are shown in table 2 below:

TABLE 2

Detecting items	The result of the detection
		Drying time (watch dry)	40min
Stain resistance (white and light color)	8％
		Alkali resistance	720h has no abnormal condition
Water resistance	720h has no abnormal condition
		Temperature change resistance of coating	5 cycles without abnormality
Resistance to artificial weathering	3000h
		Washing and brushing resistance	10000 times of no-exposed bottom
Acid resistance	720h has no abnormal condition
		Antibacterial properties	99.99% (in accordance with I grade)
Anti-mould performance	Grade 0 (conformity I grade)
		Amount of negative ion released	2886 pieces/cm3

Example 3.

The nano silicon negative ion coating comprises the following raw materials in parts by weight:

35 parts of conjugated binuclear inorganic nano-silicon film forming liquid, 25 parts of deionized water, 0.5 part of anion powder, 0.2 part of silane coupling agent, 0.1 part of heptadecafluorodecyltrimethoxysilane, 5 parts of kaolin, 11.5 parts of titanium dioxide, 15 parts of heavy calcium powder, 5 parts of silicon dioxide powder, 0.3 part of dispersing agent, 0.2 part of wetting agent, 0.4 part of thickening agent, 0.3 part of defoaming agent and 0.5 part of multifunctional auxiliary agent.

The multifunctional auxiliary agent in the embodiment is American Dow AMP-95, and the dispersant is SN-5040 of Santa Clara, Japan; the wetting agent is Dow LF-45; the thickener is Shanghai Tongyang TH-30; the antifoaming agent is Basff ST-2410.

The preparation method of the conjugated dual-core inorganic nano-silicon film-forming solution in the embodiment specifically comprises the following steps:

stirring a sodium silicate solution with the solid content of 45 percent accounting for 20 percent of the weight and a potassium silicate solution with the solid content of 26 percent accounting for 60 percent of the weight for 60 minutes under the ultrasonic condition of 50 ℃ at the rotating speed of 1600 rpm and the frequency of 60Hz, then reducing the rotating speed to 800 rpm, dropwise adding silica sol with the solid content of 25 percent accounting for 20 percent of the weight, and stirring for 60 minutes to obtain the conjugated dual-core inorganic nano-silicon film forming solution.

The preparation method of the anion powder in the embodiment specifically comprises the following steps:

soaking medical stone and tourmaline into 6mol/L hydrochloric acid according to the weight ratio of 1:3 for 6h, washing with water for 3 times, drying and grinding at 105 ℃ to obtain powder, uniformly dispersing the powder in transparent titanium dioxide sol, adding 3g of powder into every 30ml of titanium dioxide sol, stirring at 800 r/min, suction filtering, drying at 100 ℃, grinding to obtain powder, calcining at 600 ℃ for 2h in a muffle furnace, cooling, crushing and grinding to obtain the anion powder.

The preparation method of the nano silicon anion coating in the embodiment comprises the following steps:

weighing and preparing raw materials of each component according to requirements;

step two, mixing deionized water, a dispersing agent, a wetting agent, a thickening agent and a defoaming agent, dispersing for 10 minutes at a high speed, respectively dropwise adding a silane coupling agent and heptadecafluorodecyltrimethoxysilane at a high-speed dispersion rotating speed of 1200 r/min, wherein the dropwise adding speed of the silane coupling agent and the heptadecafluorodecyltrimethoxysilane is 0.5 kg/min, and continuously dispersing for 150 minutes;

and step three, sequentially adding kaolin, titanium dioxide, coarse whiting powder, silicon dioxide powder and negative oxygen ion powder into the mixed solution obtained in the step two, continuing to disperse for 10 minutes, adding the conjugated binuclear nano-silicon film forming solution, dispersing for 30 minutes, and then adding the multifunctional auxiliary agent, and dispersing for 10 minutes to obtain the nano-silicon negative ion coating.

In order to verify the performance of the nano silicon anion coating prepared in this example, the coating in this example is tested, and the specific test results are shown in table 3 below:

TABLE 3

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (7)

1. The nano silicon negative ion coating is characterized by comprising the following raw materials in parts by weight:

25-35 parts of conjugated binuclear inorganic nano-silicon film forming liquid, 25-30 parts of deionized water, 0.5-1 part of anion powder, 0.2-0.3 part of silane coupling agent, 0.06-0.1 part of heptadecafluorodecyltrimethoxysilane, 4-6 parts of kaolin, 11-15 parts of titanium dioxide, 13-17 parts of coarse whiting powder, 2-5 parts of silicon dioxide powder, 0.3-0.6 part of dispersing agent, 0.2-0.5 part of wetting agent, 0.3-0.6 part of thickening agent, 0.3-0.6 part of defoaming agent and 0.2-0.6 part of multifunctional auxiliary agent.

2. The nano silicon negative ion coating as claimed in claim 1, wherein the multifunctional assistant is American Dow AMP-95, and the dispersant is SN-5040 of Santa Clara, Japan; the wetting agent is Dow LF-45; the thickener is Shanghai Tongyang TH-30; the antifoaming agent is Basff ST-2410.

3. The nano silicon negative ion coating as claimed in claim 1, wherein the conjugated binuclear inorganic nano silicon film-forming solution is prepared by the following method comprising:

mixing a sodium silicate solution and a potassium silicate solution according to a weight ratio of 1:3, stirring for 40-60 minutes at the rotating speed of 1500-1800 rpm and the ultrasonic frequency of 60-100Hz under the condition of 40-60 ℃, then reducing to 700-900 rpm, dripping silica sol with the same weight as the sodium silicate solution, and continuously stirring for 60 minutes.

4. The nano silicon anion paint as claimed in claim 3, wherein the solid content of the sodium silicate solution is 40-50%, the solid content of the potassium silicate solution is 26-28%, and the solid content of the silica sol is 23-25%.

5. The nano silicon anion paint as claimed in claim 1, wherein the anion powder is prepared by the following method, comprising:

soaking medical stone and tourmaline into 6mol/L hydrochloric acid according to the weight ratio of 1:3 for 2-8 h, washing with water for 3-5 times, drying and grinding at 105 ℃ to obtain powder, adding 1-5g of powder into every 20-50ml of titanium dioxide sol, uniformly dispersing the powder into transparent titanium dioxide sol at the stirring speed of 800 revolutions per minute, then carrying out suction filtration, drying at 100 ℃, grinding to obtain powder, calcining at the high temperature of 800 ℃ in a muffle furnace for 2-4h, cooling, crushing and grinding.

6. A method for preparing the nano silicon negative ion coating according to any one of claims 1 to 5, characterized in that the method comprises the following steps:

mixing deionized water, a dispersing agent, a wetting agent, a thickening agent and a defoaming agent, dispersing at a high speed for 10-15 minutes, respectively dropwise adding a silane coupling agent and heptadecafluorodecyltrimethoxysilane, continuously dispersing for 150-180 minutes, sequentially adding kaolin, titanium dioxide, coarse whiting powder, silicon dioxide powder and negative oxygen ion powder, continuously dispersing for 10-30 minutes, adding the conjugated binuclear nano-silicon film forming solution, dispersing for 30-50 minutes, and then adding a multifunctional auxiliary agent, and dispersing for 10-15 minutes.

7. The method for preparing nano silicon anion paint as claimed in claim 6, wherein the high speed dispersion rotation speed is 1200 r/min, and the dropping speed of the silane coupling agent and the heptadecafluorodecyltrimethoxysilane is 0.5 kg/min.