TW202030269A - Eco-friendly multifunctional inorganic dry powder paint which not only is eco-friendly and convenient in obtaining raw materials, but also has the effects of flame retardant, anti-corrosion, insulation and high temperature resistance - Google Patents

Abstract

The present invention provides an eco-friendly multifunctional inorganic dry powder paint, which comprises: a first component, a sericite powder, a ceramic micro powder, a modified sodium silicate powder, and a hydrophobic vapor phase silica, wherein the first component is a silicate cement, an aluminate cement or a phosphate cement. By mixing the aforementioned inorganic raw materials in a specific ratio, the obtained inorganic dry powder paint is not only eco-friendly and convenient in obtaining raw materials, but also has the effects of flame retardant, anti-corrosion, insulation and high temperature resistance. In additionto not containing any volatile organic compounds (VOC), it is more environmentally friendly and safe when used, and there is no risk of harm to human health.

Description

Environmental protection multifunctional inorganic dry powder coating

The invention relates to a dry powder coating, especially an inorganic dry powder coating.

Coating is a material that can be coated on the surface of an object with different construction techniques. It can form a solid film with firm adhesion, certain strength, and continuous. With the evolution of the coating technology, by adjusting the composition of the coating, the formed paint film can have the functions of protection, decoration, insulation, corrosion resistance, or high temperature resistance.

Generally speaking, coatings are mainly composed of film-forming substances and solvents. Among them, the film-forming substances are the basis of the coating and play a decisive role in the performance of the coating. Taking into account the dispersion stability of the coating and the convenience of operation, the current coating industry uses organic coatings as the mainstream. It is necessary to select volatile hydrocarbon solvents (such as benzene, toluene, xylene, etc.), alcohols, aldehydes, ethers, alcohol ethers, and ketones, etc., to help disperse the film-forming substances to form a viscous liquid , In order to facilitate construction and coating on objects. Organic coatings have been widely used due to their good decoration, variety and low price.

However, the raw materials contained in organic coatings are mostly derived from natural resources such as coal, petroleum, and natural gas, and a large amount of by-products, volatile solvents and residual monomers are generated during processing, which not only causes environmental pollution but also wastes a lot of resources and energy; At the same time, the air permeability of the paint film formed by organic paint is not good. After a period of time, the wall is prone to hollowing, blistering or even peeling. In addition, because the paint contains organic substances, the paint film will have the disadvantages of easy breeding of microorganisms and no fire and flame retardancy. In particular, after the organic coating is applied to the substrate, a large amount of harmful volatile organic compounds (VOC) contained therein will cause air pollution and further harm human health.

In view of the technical defects of the above-mentioned existing methods, the purpose of the present invention is to provide an inorganic dry powder coating which has the advantages of being environmentally friendly and non-toxic.

Another object of the present invention is to provide an inorganic dry powder coating which has good flame retardant, anti-corrosion, insulation and high temperature resistance properties.

In order to achieve the foregoing objective, the present invention provides an environmentally friendly multifunctional inorganic dry powder coating, which comprises: a first component, a sericite powder, a ceramic micropowder, a modified sodium silicate powder and a hydrophobic fumed silica; Wherein, the first component is a Portland cement, an aluminate cement or a phosphate cement; wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the first component accounts for 55 weight percent To 65 weight percent; the content of sericite powder is 7 weight percent to 12 weight percent; the content of ceramic micropowder is 10 weight percent to 23 weight percent; the content of modified sodium silicate powder is 5 weight percent to 10 weight percent Percentage; and the content of the hydrophobic vapor-phase silica accounts for 2 weight percent to 4 weight percent.

By selecting the above-mentioned specific inorganic raw materials and mixing them in a specific ratio range, the obtained environmentally friendly multifunctional inorganic dry powder coating does not contain any volatile organic compounds (VOC), so it is more environmentally friendly and safe to use, has no pollution to the environment, and is also There is no risk of harm to human health, coupled with the selection of specific raw materials, it has the effects of flame retardant, anti-corrosion, insulation and high temperature resistance.

Preferably, the environmentally friendly multifunctional inorganic dry powder coating further includes a second component; wherein, the second component is selected from a calcium silicate powder (CaSiO ₃ ), a barium sulfate powder (BaSO ₄ ), a talc powder and The group consisting of the combination; wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the second component accounts for 3 wt% to 5 wt%; wherein, the average particle size of the second component is Between 1000 mesh to 2000 mesh. The talc powder is magnesium silicate hydrate (3Mg･4SiO ₂ ･H ₂ O), which is pulverized, washed with acid, and dried. By adding the second component, the fluidity when mixed with water can be increased, precipitation can be prevented, good insulation properties can be provided, and the overall brightness of the formed coating can be improved.

Preferably, the environmentally-friendly multifunctional inorganic dry powder coating further includes a fine silicon powder, which is made of natural quartz (SiO ₂ ) through multiple processes such as crushing, ball milling, flotation, pickling purification, and high-purity water treatment. Micropowder. Preferably, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the silicon micropowder is 4 wt% to 7 wt%; the average particle size of the silicon micropowder is between 1000 mesh and 2000 mesh. By adding the silica powder, the acid resistance of the environmentally friendly multifunctional inorganic dry powder coating can be further improved.

According to the present invention, the Portland cement in the first component contains tricalcium silicate (3CaO･SiO ₂ ), dicalcium silicate (2CaO･SiO ₂ ), tricalcium aluminate (3CaO･SiO ₂ ･Al ₂ O ₃ ) or tetracalcium aluminate (4CaO･Al ₂ O ₃ ･Fe ₂ O ₃ ); the aluminate cement contains monocalcium aluminate (CaO･Al ₂ O ₃ ) and monocalcium aluminate (CaO･2Al ₂ O ₃ ); The phosphate cement contains magnesium oxide (MgO), dipotassium hydrogen phosphate (K ₂ HPO ₄ ), and potassium dihydrogen phosphate (KH ₂ PO ₄ ). Preferably, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the first component accounts for 58 weight percent to 60 weight percent. Wherein, the average particle size of the first component is between 200 mesh and 600 mesh; in addition, the average particle size of the first component can be reduced to more than 1000 mesh by grinding. Considering the environment in which the coating formed by the environmentally friendly multifunctional inorganic dry powder coating is located, if the ambient temperature is within 400℃, the first component is preferably Portland cement; if the ambient temperature is between 400℃ and 800℃ If the ambient temperature is between 800°C and 1000°C, the first component is preferably phosphate cement.

Preferably, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the sericite powder accounts for 7 wt% to 10 wt%; the average particle size of the sericite powder is between 800 mesh and 2000 mesh between. Since the sericite powder is elastic, bendable, and hardly soluble in acid and alkali solutions, the formed coating can have good ductility and acid and alkali resistance.

According to the present invention, the ceramic powder may include silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and the like. Preferably, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the ceramic micropowder is 10% to 20% by weight; the average particle size of the ceramic micropowder is between 1000 mesh and 2000 mesh. By adding the ceramic powder, the environmentally-friendly multifunctional inorganic dry powder coating can be provided with excellent acid and alkali resistance.

According to the present invention, the modified sodium silicate powder, also known as modified water glass, is sodium silicate modified by a water-soluble silane coupling agent, sodium fluorosilicate and the like. Preferably, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the modified sodium silicate powder accounts for 7 wt% to 10 wt%; the average particle size of the modified sodium silicate powder is 1000目 above. The modified sodium silicate powder can provide the inorganic dry powder coating with good adhesion and water resistance.

According to the present invention, the hydrophobic vapor-phase silica is, for example, a commercially available hydrophobic AEROSIL vapor-phase silica product, but it is not limited to this. Preferably, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the hydrophobic vapor phase silica is 2% to 3% by weight; the average particle size of the hydrophobic vapor phase silica is More than 1000 mesh. Due to the hydrophobicity (hydrophobicity) and low hygroscopicity of the hydrophobic fumed silica, the formed coating can have quite good waterproof properties.

In the specification, the range represented by "decimal value to large value", unless otherwise specified, means that the range is greater than or equal to the small value to less than or equal to the large value. For example: 55 weight percent to 65 weight percent, which means that the range is "greater than or equal to 55 weight percent to less than or equal to 65 weight percent".

Another object of the present invention is to provide an environmentally friendly multifunctional coating which is cured by mixing the environmentally friendly multifunctional inorganic dry powder coating with water as described above. The environmental protection multifunctional coating of the present invention has the advantages of flame retardant, anticorrosion, insulation, high temperature resistance and no volatile organic compounds (VOC).

Another object of the present invention is to provide an environmentally friendly multifunctional inorganic dry powder coating, which includes mixing the aforementioned environmentally friendly multifunctional inorganic dry powder coating with water and then applying it on a substrate to be cured on the substrate into an environmentally friendly multifunctional coating.

Preferably, the mixing ratio of the environment-friendly multifunctional inorganic dry powder coating and water of the present invention can be 55:100 to 65:100.

In the application of the environmentally-friendly multifunctional inorganic dry powder coating of the present invention, the substrate includes materials selected by construction and decoration industries such as metal, stainless steel, concrete, wood materials, and plastic materials.

According to the present invention, when the environmentally friendly multifunctional inorganic dry powder coating is applied, it only needs to be evenly mixed with water to be coated on the substrate, and the operation process is simple, pollution-free and harmless to the human body; and subsequently formed on the substrate The coating has the advantages of flame-retardant, anti-corrosion, insulation, high temperature resistance and no generation of volatile organic compounds (VOC), thereby enhancing the applicable range and value of the environmentally friendly multifunctional inorganic dry powder coating of the present invention.

Several specific examples are listed below to illustrate the implementation of this creation. Those who are familiar with this art can easily understand the advantages and effects of this creation through the content of this manual, and make various modifications without departing from the spirit of this creation. And changes to implement or apply the content of this creation.

Example 1

According to the weight ratio shown in Table 1 below, mix Portland cement, sericite powder, ceramic powder, modified sodium silicate powder and hydrophobic fumed silica in a container of appropriate size to obtain The environmental protection multifunctional inorganic dry powder coating of Example 1.

Example 2 to 5

According to the weight ratio shown in Table 1 below, in a container of appropriate size, Portland cement, sericite powder, silica powder, ceramic powder, calcium silicate powder, modified sodium silicate powder and hydrophobic gas phase The silicon dioxide is evenly mixed to obtain the environmentally-friendly multifunctional inorganic dry powder coatings of Examples 2 to 5. Table 1: The weight percentage of each raw material powder in the environmental protection multifunctional inorganic dry powder coatings of Examples 1 to 5 Example 1 Example 2 Example 3 Example 4 Example 5 Portland cement 60% 58% 60% 60% 60% Sericite powder 10% 10% 8% 7% 10% Silica powder - 7% 7% 7% 4% Ceramic powder 20% 12% 10% 10% 10% Calcium silicate powder - 3% 3% 3% 3% Modified sodium silicate powder 7% 7% 10% 10% 10% Hydrophobic fumed silica 3% 3% 2% 3% 3%

When applying the environmental protection multifunctional inorganic dry powder coatings of the above embodiments 1 to 5, the environmental protection multifunctional inorganic dry powder coatings of each embodiment and water are mixed in a ratio of 55:100 to 65:100, and the coating is obtained after uniform mixing For the coating on the substrate, the coating on the substrate will form a coating after drying and curing. The aforementioned base material can be selected from metal, stainless steel, concrete, wood materials, plastic materials and other materials used by construction and decoration industry.

Test example: environmental protection Multifunction Characteristic analysis of inorganic dry powder coating

The following characteristics of environmentally friendly multifunctional inorganic dry powder coatings are commissioned by the Petroleum and Chemical Industry Special Paint Pigment Quality Inspection Center for testing. The testing items include impact resistance, water resistance, acid and alkali resistance, humidity and heat resistance, artificial weathering resistance, and Salt spray resistance; and the testing of the content of volatile organic compounds (VOC) is commissioned by SGS materials and engineering laboratories for testing.

Impact resistance analysis

According to the specifications of GB/T 1732-1993 "Test Method for Impact Resistance of Paint Films", the environmental protection multifunctional inorganic dry powder coating of Example 1 was tested. When testing, the environmentally friendly multifunctional inorganic dry powder coating of Example 1 was mixed with water in a ratio of 60:100, and then coated on the test plate. After drying, a weight of 1000 grams was released at a fixed height to make the weight Drop on the test board, then take out the test board and observe with a 4x magnifying glass to determine whether the paint film has cracks, wrinkles and peeling phenomena. The result of this test is the maximum height of the heavy hammer falling on the test board without causing damage to the paint film (cm ), which represents the impact resistance of the paint film. The results are shown in Table 2 below.

Water resistance analysis

The environmental protection multifunctional inorganic dry powder coating of Example 1 was tested in accordance with the specifications of Method A (water immersion test method) of GB/T 1733-1993 "Water Resistance Test Method of Paint Film". When testing, mix the environmentally friendly multifunctional inorganic dry powder coating of Example 1 with water at a ratio of 60:100 and apply it on the test board. After drying, immerse two-thirds of the test board at 21°C to 25°C. After 500 hours of soaking in water at ℃, take out the test board to absorb the liquid and observe whether the paint film has loss of gloss, discoloration, blistering, wrinkling, peeling, and rust. The results are shown in Table 2 below.

Acid and alkali resistance analysis

According to GB/T 9274-1988 "Color Paints and Varnishes-Determination of Resistance to Liquid Medium", the A method (immersion method), the environmental protection multifunctional inorganic dry powder coating of Example 1 was tested. When performing acid resistance testing, mix the environmentally friendly multifunctional inorganic dry powder coating with water in a ratio of 60:100 and apply it on the test board. After drying, immerse two-thirds of the test board in a temperature between 21℃ and 25℃. After 96 hours of soaking in 5% sulfuric acid solution, take out the test board to absorb the liquid and observe whether the paint film has loss of gloss, discoloration, blistering, wrinkling, peeling, and rust; when performing alkali resistance testing , Mix the environmentally-friendly multifunctional inorganic dry powder coating with water in a ratio of 60:100 and apply it on the test board. After drying, immerse two-thirds of the test board in 5% sodium hydroxide at 21℃-25℃ After 1000 hours of soaking in the solution, take out the test plate to absorb the liquid and observe whether the paint film has loss of gloss, discoloration, blistering, wrinkling, peeling, and rust. The results are shown in Table 2 below.

Humidity and heat resistance analysis

According to the specifications of GB/T 1740-2007 "Damp and Heat Resistance of Paint Film", the environmental protection multifunctional inorganic dry powder coating of Example 1 was tested. When testing, the environmentally friendly multifunctional inorganic dry powder coating of Example 1 is mixed with water in a ratio of 60:100 and then coated on the test panel. After drying, the test panel is placed at a temperature of 46°C to 48°C and relative humidity. In a 94% to 98% temperature and humidity control box, after 500 hours of storage, take out the test board and observe whether there is discoloration, blistering, cracking, rust or other damage. The results are shown in Table 2 below.

Resistant to artificial weather aging analysis

According to GB/T 1865-2009 "Artificial Climate Aging and Artificial Radiation Exposure of Paints and Varnishes" Method 1, Cycle A, the environmental protection multifunctional inorganic dry powder coating of Example 1 was tested. When testing, the environmentally friendly multifunctional inorganic dry powder coating of Example 1 was mixed with water in a ratio of 60:100 and then coated on the test panel. After drying, the test panel was exposed to an argon lamp that simulated sunlight (method 1) At the same time, wetting the test panel periodically (cycle A). After 3500 hours of testing, take out the test panel and observe whether there is discoloration, blistering, cracking, rust or other damage. The results are shown in Table 2 below.

Salt spray resistance analysis

According to the GB/T 1771-2007 "Determination of the resistance to neutral salt spray of paints and varnishes", the environmental protection multifunctional inorganic dry powder coating of Example 1 was tested. When testing, the environmentally friendly multifunctional inorganic dry powder coating of Example 1 was mixed with water in a ratio of 60:100 and then coated on the test panel. After drying, the test panel was exposed to a concentration of 45 g/L to 55 g/ After 5000 hours of testing in sodium chloride salt mist with a pH of 6.5 to 7.2, take out the test plate and observe whether there is peeling, blistering, cracking, rust or other damage. The results are shown in Table 2 below.

Table 2: Characteristic analysis of the environmental protection multifunctional inorganic dry powder coating of Example 1 Test item name Test results Testing standard Impact resistance 10 cm GB/T 1732-1993 Water resistance (500 hours) The paint film has no discoloration or loss of gloss; no morbid phenomena such as blistering, rust, cracking, falling off, etc. GB/T 1733-1993 (Method A) Acid resistance (5% sulfuric acid solution, 96 hours) The paint film has no discoloration or loss of gloss; no morbid phenomena such as blistering, rust, cracking, falling off, etc. GB/T 9274-1988 (Method A) Alkali resistance (5% sodium hydroxide solution, 1000 hours) The paint film has no discoloration or loss of gloss; no morbid phenomena such as blistering, rust, cracking, falling off, etc. Humidity and heat resistance (500 hours) No blistering, rust, cracking, falling off, etc. GB/T 1740-2007 Resistant to artificial weather aging (3500 hours) No blistering, rust, cracking, falling off, etc. GB/T 1865-2009 Salt spray resistance (5000 hours) No blistering, rust, cracking, falling off, etc. GB/T 1771-2007

Volatile Organic Compound (VOC) analysis

According to the specifications of CNS 15039, the environmental protection multifunctional inorganic dry powder coating of Example 1 was tested. The test results show that the volatile organic compound (VOC) contained in the environmentally friendly multifunctional inorganic dry powder coating of Example 1 of the present invention is far below the allowable value specified in the specification, which confirms that the environmentally friendly multifunctional inorganic dry powder coating of the present invention will not The production of volatile organic compounds causes air pollution and harms human health. Accordingly, the environmentally friendly multifunctional inorganic dry powder coating of the present invention is more environmentally friendly and safer than general organic coatings containing organic solvents.

Combustion performance analysis

The environmental protection multifunctional inorganic dry powder coating of Example 1 is entrusted to the National Building Materials Testing Center for testing. After testing, the samples submitted for inspection will be classified according to the standard requirements in GB 8624-2012 "Classification of Building Materials and Products". The combustion performance level of building materials (products) can be divided into: non-combustible (A), non-combustible (B ₁ ), combustible (B ₂ ) and flammable (B ₃ ). Among them, the non-combustible (A) of flat-shaped building materials The grades can be further subdivided into A1, which is the most stringent standard and A2, which is the next highest standard. The test results are listed in Table 3 below.

Table 3: Analysis of the combustion performance of the environmental protection multifunctional inorganic dry powder coating of Example 1 Test items standard requirement test result Single conclusion Combustion performance (A1) Average temperature rise in the furnace (℃) ≦30 15 meets the Continuous burning time (s) 0 0 meets the Quality loss rate (%) ≦50 13 meets the Total combustion heat value (MJ/kg) ≦2.0 0 meets the

According to the test results, the environmentally friendly multifunctional inorganic dry powder coating of the present invention meets the requirements of the A1 level of the flat building material in the combustion performance classification, indicating that the environmentally friendly multifunctional inorganic dry powder coating of the present invention is the most stringent non-combustible material ( Products), has excellent flame retardant effect.

In summary, the present invention selects raw materials such as Portland cement, sericite powder, ceramic powder, modified sodium silicate powder, and hydrophobic fumed silica, which are not only easy to obtain, but also free of volatile organic compounds (VOC). In addition, after mixing the aforementioned specific raw materials in a specific ratio, a low-cost, flame-retardant, anticorrosive, insulating, high-temperature resistant and environmentally friendly inorganic dry powder coating can be obtained. During application, the environment-friendly multifunctional inorganic dry powder coating of the present invention can be evenly mixed with water to be coated on the substrate. The operation process is simple, pollution-free and harmless to the human body, thereby enhancing the environment-friendly multifunctionality of the present invention The applicable range and value of inorganic dry powder coatings.

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Claims (9)

An environmentally-friendly multifunctional inorganic dry powder coating, comprising: a first component, a sericite powder, a ceramic powder, a modified sodium silicate powder and a hydrophobic vapor phase silica; wherein the first component is a Portland cement, monoaluminate cement or monophosphate cement; Wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the first component accounts for 55 wt% to 65 wt%; the sericite powder content accounts for 7 wt% to 12 wt%; the ceramic powder The content accounts for 10% to 23% by weight; the content of the modified sodium silicate powder accounts for 5% to 10% by weight; and the content of the hydrophobic gas phase silica accounts for 2% to 4% by weight. The environmental protection multifunctional inorganic dry powder coating of claim 1, wherein the environmental protection multifunctional inorganic dry powder coating further includes a second component; wherein, the second component is selected from a calcium silicate powder, a barium sulfate powder, A group consisting of talc powder and its combination; wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the second component accounts for 3 wt% to 5 wt%; wherein, the second component The average particle size is between 1000 mesh and 2000 mesh. The environmentally friendly multifunctional inorganic dry powder coating of claim 1, wherein the environmentally friendly multifunctional inorganic dry powder coating further comprises a silica powder; wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the silica powder It accounts for 4 weight percent to 7 weight percent; wherein, the average particle size of the second component is between 1000 mesh and 2000 mesh. The environmentally friendly multifunctional inorganic dry powder coating of any one of claims 1 to 3, wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the first component accounts for 58 weight percent to 60 weight percent . The environmental protection multifunctional inorganic dry powder coating according to any one of claims 1 to 3, wherein, based on the total weight of the environmental protection multifunctional inorganic dry powder coating, the content of the sericite powder accounts for 7 weight percent to 10 weight percent ; The average particle size of the sericite powder is between 800 mesh and 2000 mesh. The environmentally friendly multifunctional inorganic dry powder coating according to any one of claims 1 to 3, wherein, based on the total weight of the environmentally friendly multifunctional inorganic dry powder coating, the content of the ceramic micropowder accounts for 10 to 20 weight percent; The average particle size of the ceramic powder is between 1000 mesh and 2000 mesh. The environmental protection multifunctional inorganic dry powder coating according to any one of claims 1 to 3, wherein the portland cement contains tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminate ferrite; The aluminate cement contains monocalcium aluminate and monocalcium dialuminate; the phosphate cement contains magnesium oxide, dipotassium hydrogen phosphate and potassium dihydrogen phosphate. An environmentally-friendly multifunctional coating, which is cured by mixing the environmentally-friendly multifunctional inorganic dry powder coating according to any one of claims 1 to 7 and water. An environmentally-friendly multifunctional inorganic dry powder coating, which comprises mixing the environmentally-friendly multifunctional inorganic dry powder coating as described in any one of claims 1 to 7 with water, and then applying it to a substrate to be cured on the substrate. Environmental protection multifunctional coating.