Nanometer pure inorganic finishing agent technology and preparation

Abstract

The invention provides a technology and preparation of a nanometer pure inorganic finishing agent. The pure inorganic finishing agent is at least prepared from the following components in parts by weight: 25 to 35 parts of sodium silicate, 10 to 15 parts of nanometer silicon dioxide, 12 to 30 parts of potassium silicate and 10 to 15 parts of lithium silicate. 5-2.5 parts by weight of a coupling agent, 0.2-0.5 part by weight of a silane defoaming agent and 1-0.5 part by weight of an emulsifier. The finishing agent developed through reasonable design and careful experiments is bright like a mirror, smooth in hand feeling, high in surface hardness, scratch-resistant, permanently waterproof and stain-resistant, has a self-cleaning function, does not pollute the environment, does not have toxic volatilization, is fire-resistant and flame-retardant, has the service life as long as hundreds of years, effectively overcomes the defects of pure machine products on the market, and is worthy of popularization and application. The current market demand is very large, and the prospect is very wide.

Description

Technical field:

[0001] The invention relates to the technical field of coatings, in particular to a pure inorganic facing agent and a preparation method thereof. Background technology:

[0002] In the coating industry, the current market dominated by water-based coatings, powder coatings and artistic coatings have problems such as not being resistant to rain erosion, fading after rain erosion and sunlight ultraviolet rays, insufficient surface hardness, scratches, etc. An organic coating agent has been born on the market, which can solve the above defects of the wall surface and solve the problems of easy fading and water resistance. It is very popular in the social industry, but it has some problems. Because it is synthesized from organic materials, it ages quickly after light exposure, is not environmentally friendly, is toxic and carcinogenic, is not water-resistant, and has high resin costs. These environmentally unfriendly products are about to be banned by the country. Therefore, according to market demand, a pure inorganic coating agent is urgently needed to be put on the market to replace the existing organic coating agent. Summary of the invention:

[0003] In order to solve the technical deficiencies of the above products, the inventor provides a pure inorganic surface technology and preparation method. It effectively solves the problems of easy fading under sunlight, poor aging resistance, long-term erosion by rain, high cost, environmental pollution, no flame retardancy, and no scratch resistance. In order to solve the above technical problems, the present invention provides the following technical solutions:

[0004] A pure inorganic finishing agent is prepared from the following raw materials in parts by weight: 25-35 parts by weight of potassium silicate, 10-15 parts by weight of nano silicon dioxide, 2-5 parts by weight of coupling agent, 0.5 parts by weight of silane defoamer, 0.5-1 parts by weight of emulsifier, 15 parts by weight of lithium silicate and 25-35 parts by weight of tap water.

[0005] Preferably, the inorganic nano-silicon dioxide dispersion contains one or more of 5-7 nanometers, 8-10 nanometers and 15-30 nanometers.

[0006] The silicate and the inorganic alkali metal include one or more of sodium silicate, potassium silicate and lithium silicate.

[0007] The preferred coupling agent is one or more of KH550, silicate coupling agent, aluminate coupling agent, and silane coupling agent KH560.

[0008] Preferably, the lithium silicate is a 5 nanometer lithium silicate solution with a solid content of 30%, potassium silicate, sodium silicate, potassium silicate or more.

[0009] Preferably, the emulsifier is OP-10, which has excellent emulsifying properties, can effectively mix water and oil, has strong stability, wide adaptability, and is safe and non-toxic.

[0010] The preferred defoamer is a silane polyoxyethylene ether inorganic material, which has excellent hydrophobicity and self-cleaning properties, unique and efficient defoaming function, and the advantage of less addition amount, including one or more of silicone, polyether and polyether modified defoamers.

[0011] The present invention also provides a technical preparation method of the above-mentioned pure inorganic finishing agent, in particular, a preparation method of the nano-silicon dioxide dispersion is as follows.

[0012] Add 35 parts of tap water into a dispersion kettle, heat the sodium silicate and hydroxide with the reacted solution in a container under heating conditions, add a diluent to the silicate solvent in a mixture of alcohol and water to form a gel, and form nano-silicon dioxide crystals after drying, pyrolysis and other treatments, and then add 70 parts of pure water in a ball mill to grind to a particle size of 3-20 nanometers to obtain a nano-silicon dioxide dispersion with a silicon dioxide content of ≥30.

[0013] Add 25 parts of tap water into the dispersion kettle, start the dispersion kettle stirring motor, and start stirring at a speed of 80 revolutions per minute. Then add 15 parts of nano-silicon dioxide dispersion, 0.5 parts by weight of silane defoamer, and 0.5 parts by weight of emulsifier, then heat to 70°C, add 30 parts of potassium silicate, maintain the temperature for 60 minutes, carry out modification and reaction, then cool to room temperature, stir again, add 15 parts of lithium silicate, 2.5 parts of coupling agent OP-10, and 1.75 parts of silicon tripolyphosphate curing agent, and fully disperse. Mix evenly to obtain a nano-pure inorganic finishing agent.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects.

[0015] The present invention adopts nano-silicon dioxide dispersion and potassium silicate to carry out cross-linking reaction under high temperature of emulsifier, and under the catalytic reaction of tripolyphosphate silicon curing agent, the coating agent is very hard on the coating surface, and the scratch resistance hardness can reach 4H after testing. Due to the addition of lithium silicate modification, the coating layer is bright and self-cleaning, and the anti-fouling performance is improved. Due to the synthesis of inorganic silicate components, the coating layer can be flame-retardant at high temperature up to 1200°C, and the flame retardant grade A1 index. Since the formula adopts inorganic silicon components, the product is non-toxic, tasteless, pollution-free, does not contain any formaldehyde, flammable, harmful chemical components, and the product meets the national environmental protection standards. Since the product design adopts inorganic potassium silicate material, the life span of the product on the market today is several times higher than that of the product on the market today in terms of anti-aging under ultraviolet radiation. Since the nano-silicon dioxide dispersion and inorganic silicate lithium silicate components are adopted, the performance of long-term water immersion resistance is achieved. Description of the drawings: Attached Figure 1This is a new type of nano pure inorganic finishing agent technology and preparation process diagram used in building materials according to the present invention. Specific implementation method:

[0016] The invention provides a nano pure inorganic finishing agent, which is prepared from the following raw materials in parts by weight: 30 parts by weight of inorganic potassium silicate, 10 parts by weight of nano silicon dioxide dispersion, 25 parts by weight of alkali metal inorganic sodium silicate, 15 parts by weight of lithium silicate, 2.5 parts by weight of coupling agent, 0.5 parts by weight of silane defoamer, 0.5 parts by weight of emulsifier and 25 parts by weight of tap water.

[0017] In the present invention, the nano silicon dioxide is 10-15 parts by weight, preferably 9-14 parts by weight, and the nano silicon dioxide silicon dioxide includes one or more of 3-5 nanometers, 15-20 nanometers, 6-8 nanometers, preferably one or more of 12-16 nanometers.

[0018] In the present invention, the inorganic silicate is 10-30 parts by weight, preferably 8-20 parts by weight. The inorganic silicate comprises one or more of sodium silicate, potassium silicate and lithium silicate.

[0019] In the present invention, the silane defoamer is 0.2-0.5 parts by weight, preferably 0.1-0.3 parts by weight, and the silane defoamer comprises one or more of polyoxyethylene ether and modified polyether, polyamide, and dimethylsiloxane.

[0020] In the present invention, the coupling agent is 2.5-5 parts by weight, preferably 2-3 parts by weight, and the coupling agent includes one or more of KH550 aluminate coupling agent, bimetallic coupling agent, and phosphate coupling agent.

[0021] In the present invention, water is 25-35 parts by weight, preferably 20 to 30 parts by weight.

[0022] The invention provides the above-mentioned nano pure inorganic finishing agent technology and preparation method, comprising the following steps: 1. adding 25 parts of water into a reaction kettle, then adding 20 parts of propanol and 30 parts of silicone ester into the reaction kettle in sequence for dispersion and mixing, then adding methanol diluent to form gel, then drying in a distillation tower, pyrolysis treatment to form nano silicon dioxide crystals, then adding 70 parts of pure water into a ball mill, grinding to a particle size of 3-20 nanometers, and obtaining a nano silicon dioxide dispersion. 2. The obtained nano silicon dioxide dispersion, potassium silicate, lithium silicate coupling agent, silane defoamer and emulsifier are evenly dispersed in a stirring tank to obtain a nano pure inorganic finishing agent.

[0023] The grinding machine described in the present invention is an undercover sand mill, and 1mm high wear-resistant zirconium oxide beads are used in the sand milling to grind to a fineness of ≤15um-0.1mm.

[0024] The technical solution provided by the present invention is described in detail below with reference to examples, but they should not be understood as limiting the protection scope of the present invention.

[0025] Example 1 First, add 25 parts by weight of sodium silicate, 10 parts by weight of nano silicon dioxide dispersion, 10 parts by weight of lithium silicate, 5 parts by weight of coupling agent, 0.2 parts by weight of silane defoamer, 0.5 parts by weight of emulsifier, and 25 parts by weight of tap water into the dispersion, stir and disperse them fully, stir and emulsify at 300 rpm for 40 minutes, and then stop. At this time, a nano pure inorganic finishing agent has been obtained. According to GB / T5173-1995 building interface agent, various performance tests were carried out on the obtained nano pure inorganic finishing agent, including anti-aging performance test, hot and cold shock test, salt spray test, rapid humidity, climate aging, ultraviolet aging test, and carbon arc lamp aging test, all of which are superior to the existing organic products on the market. Example 2 First, 35 parts by weight of water, 1 part by weight of emulsifier, 0.5 parts by weight of silane defoamer, 2.5 parts by weight of coupling agent, 15 parts by weight of lithium silicate, 15 parts by weight of silicon dioxide, 35 parts by weight of sodium silicate and so on are added into a dispersion kettle and stirred at 300 revolutions per minute. Stirring and dispersing are stopped when the stirring is continued for 40 minutes to obtain a nano pure inorganic coating agent. According to the national standard GB55030-2022 building waterproofing, various properties of the prepared nano pure inorganic finishing agent were tested, among which the combustion performance reached A1 level, the elongation was ≥5.0, the solid content % ≥55, the toxicity was quasi-safe ZA1 level, and the water resistance did not change for 48 hours. At the same time, the pure inorganic silicate system has good weather resistance and long-term stain resistance.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be considered as the protection scope of the present invention.

Claims

1. A pure inorganic finishing agent technology and preparation, characterized in that the pure inorganic finishing agent composition is prepared by the following weight parts: 25-35 weight parts of potassium silicate, 10-15 weight parts of nano silicon dioxide, 2-5 weight parts of coupling agent, 0.5 weight part of silane defoamer, 0.5-1 weight part of emulsifier, 15 weight parts of lithium silicate, and 25-35 weight parts of tap water.

2. The inorganic nano-silicon dioxide dispersion preferably contains 5-7nm, 8-10 and 15-30nm.

3. The preferred coupling agent is KH550, silicate coupling agent, aluminate coupling agent, silane coupling agent KH560.

4. The lithium silicate described is a 5 nanometer lithium silicate solution with a 30% solid content, potassium silicate, sodium silicate, and potassium silicate.

5. A technical preparation method of the above-mentioned pure inorganic coating agent is provided, in particular, a preparation method of a nano-silicon dioxide dispersion is as follows: 35 parts of tap water are added to a dispersion kettle, sodium silicate and hydroxide are heated and reacted with the reaction solution in a container under heating conditions, a silicate solvent is added with a diluent in a mixture of alcohol and water to form a gel, and after drying, pyrolysis and other treatments, nano-silicon dioxide crystals are formed, and then 70 parts of pure water are added to a ball mill for grinding to 3-20nm, that is, Get a nano-silicon dioxide dispersion with a silicon dioxide content of ≥30%. Add 25 parts of tap water into a dispersion kettle, start the dispersion kettle stirring motor, and start stirring at 80 revolutions per minute. Then add 15 parts of nano-silicon dioxide dispersion, 0.5 parts by weight of silane defoamer, and 0.5 parts by weight of emulsifier. Then heat to 70°C, add 30 parts of potassium silicate, maintain the temperature for 60 minutes, perform modification and reaction, then cool to room temperature, stir again, add 15 parts of lithium silicate, 2.5 parts of coupling agent OP-10, and 1.75 parts of tripolyphosphate silicon curing agent, and fully disperse. Mix evenly to obtain a nano-pure inorganic finishing agent.

6. The present invention provides a nano pure inorganic finishing agent, which is prepared from the following raw materials in parts by weight: 30 parts by weight of inorganic potassium silicate, 10 parts by weight of nano silicon dioxide dispersion, 25 parts by weight of alkali metal inorganic sodium silicate, 15 parts by weight of lithium silicate, 2.5 parts by weight of coupling agent, 0.5 parts by weight of silane defoamer, 0.5 parts by weight of emulsifier, 25 parts by weight of tap water, 10-15 parts by weight of nano silicon dioxide, preferably 9-14 parts by weight, and the nano silicon dioxide silicon dioxide comprises one or more of 3-5 nanometers, 15-20 nanometers, and 6-8 nanometers, preferably 12-16nm.

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