Inorganic silicon-calcium coating

Abstract

The invention belongs to an inorganic silicon-calcium coating and a preparation method thereof.The inorganic silicon-calcium coating is prepared from, by weight, dicalcium silicate, fine lime powder, calcite, calcium sulfate, titanium dioxide, a 722 dispersing agent, xanthan gum and a flatting agent. The combustion performance reaches A1-level flame retardance, air can be purified, production can be carried out only through one stirrer in the production process, and the phenomenon that a traditional latex production process is complex is effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of inorganic calcium silicate coatings and relates to an inorganic calcium silicate coating and a preparation method thereof. Background Art

[0002] In the coatings industry, it is imperative to take water-based coatings as the leader and replace the seriously polluting solvent-based coatings with dry powder coatings. Water-based coatings have also been widely used. However, the architectural water-based latex coatings currently used are composed of polymer emulsions, fillers, additives and water, of which additives and water are used for the production and storage of coatings, accounting for more than half of the weight and price of the coatings. Most of the water-based paint is water. Among industrial protective coatings, epoxy resin coatings are the mainstream products, which are mostly solvent-based coatings and generally contain a large amount of volatile organic compounds (100-400g / L). The organic solvents evaporate into the air, which will harm the health of production and construction personnel and pose a fire hazard. In addition, the organic compounds that evaporate into the atmosphere react photochemically with nitrogen oxides under the action of ultraviolet rays to form smog, which causes great pollution to the environment. However, physical adsorption is currently the main method. Physical adsorption of formaldehyde is easily saturated, and when the temperature and humidity change, it will cause the release of formaldehyde, etc., causing secondary pollution. In the research and development process of the new generation of coatings, in addition to considering whether the product has the function of environmental protection (such as removing formaldehyde, containing no volatile organic compounds and no heavy metals), the combustion performance of the product should also be considered from the perspective of fire protection (especially in the manufacturing and transportation process and application). Combustion performance refers to all physical and chemical changes that occur when it burns or encounters fire. This performance is measured by the ignition and flame spread of the material surface, heat generation, smoke generation, carbonization, weight loss (for example: the mass loss rate of materials with better combustion performance is ≤50%), and the production of toxic products. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an inorganic calcium silicate coating and a preparation method thereof, which can effectively decompose formaldehyde, has flame retardant properties, does not contain volatile organic compounds and purifies the air. It can be produced by stirring with pure water without adding emulsion and solidified by air to achieve 6000 scrubbing times and 4H strength, which can effectively solve the problem that latex paint is not water-resistant. In order to solve the above technical problems, the present invention provides the following technical solutions:

[0004] On the one hand, an inorganic calcium silicate coating is provided, characterized in that it is composed of at least the following components in parts by weight: 20-40 parts of dicalcium silicate, 15-20 parts of fine lime powder, 10-25 parts of calcium vanadium, 5-15 parts of calcium sulfate, 0.3-2 parts of leveling agent 722, 5-10 parts of titanium dioxide, 0.5-1 parts of xanthan gum, and 0.3-0.7 parts of defoaming agent. Furthermore, the inorganic calcium silicate coating has a volatile organic compound content of ≤0 g / L.

[0005] Furthermore, the ingredients are as follows by mass: 25-40 parts of dicalcium silicate, 15-20 parts of fine lime powder, 15-20 parts of calcium vanadium, 5-15 parts of calcium sulfate, 0.3-2 parts of leveling agent 722, 6-10 parts of titanium dioxide, 0.5-1 parts of xanthan gum, and 0.3-0.7 parts of defoaming agent.

[0006] Furthermore, the ingredients are: 20 parts of dicalcium silicate, 15 parts of fine lime powder, 10 parts of calcium silicate, 5 parts of calcium sulfate, 0.3 parts of leveling agent 722, 5 parts of titanium dioxide, 0.5 parts of xanthan gum, and 0.3 parts of defoaming agent.

[0007] Furthermore, the xanthan gum powder refers to African subtropical locust bean gum extract.

[0008] Furthermore, the defoaming agent is an inorganic siloxane 12-alkyl compound.

[0009] Furthermore, the leveling agent 722 is one or both of sodium polyphosphate and sodium pyrophosphate.

[0010] Furthermore, the inorganic calcium silicate coating has a continuous burning time of ≤0s.

[0011] Furthermore, the mass loss rate of the inorganic calcium silicate coating is ≤5%.

[0012] On the other hand, the present invention provides a method for preparing an inorganic calcium silicate coating, comprising the following steps:

[0013] S1: adding the xanthan gum pure plant gum powder and dispersant into a stirring kettle in proportion and stirring evenly;

[0014] S2: Continue to add dicalcium silicate, fine lime powder, calcite, calcium sulfate leveling agent, titanium dioxide, xanthan gum and defoaming agent and stir evenly.

[0015] Furthermore, the method further comprises step S3: filtering and packaging the prepared coating, and then storing it in storage.

[0016] In summary, the beneficial effects of the present invention are as follows:

[0017] The present invention uses a scientific ratio of dicalcium silicate, fine lime powder, and calcium silicate, and utilizes their inorganic high-activity material characteristics to achieve a chemical curing reaction to generate a very strong and hard calcium silicate solidified product with good water resistance and strong bonding force. In addition, the fine lime powder can disinfect and purify formaldehyde gas, and improve the efficiency of decomposing formaldehyde. The materials used to play the role of natural anti-corrosion, anti-mildew and sterilization are all natural inorganic gelling materials and natural plant glue powder. The coating designed by the present invention through scientific formulation does not contain volatile organic compounds, and the combustion performance reaches A1 grade flame retardant. It is an inorganic natural material, so it is resistant to weathering, has a long service life, and is cheap. The raw materials are easily available, which effectively solves the high price instability caused by the traditional use of acrylic resin as coating and the fluctuation of international chemical oil prices. DETAILED DESCRIPTION Embodiment 1

[0018] The inorganic calcium silicate coating of the present invention is prepared by the following method:

[0019] S1: Add 40 kg of tap water into a stirring kettle, then add 35 kg of dicalcium silicate, 5 kg of xanthan gum powder, 0.5 kg of defoamer, and 0.7 kg of leveling agent into the stirring kettle in proportion and stir evenly at a stirring speed of 30 / min;

[0020] S2: Add 1 kg of fine lime powder, 4 kg of titanium dioxide, 0.2 kg of dispersant, 50 kg of limestone, 10 kg of calcium sulfate and 60 kg of water and stir evenly to obtain a coating; the coating has zero volatile gas, organic compounds (specifically, the test result is about 0g / L), the coating mass loss rate is ≤10%, and the hardness is 4H. It can withstand 6000 washes.

[0021] S3: Filter and package the prepared coating and put it into storage. Embodiment 2

[0022] The inorganic calcium silicate coating of the present invention is prepared by the following method:

[0023] S1: Add 25 kg of fine lime, 10 kg of xanthan gum and 0.8 kg of dispersant into a stirring tank in proportion and stir evenly at a stirring speed of 30 / min;

[0024] S2: Mix 30 kg of fine lime powder, 10 kg of titanium dioxide, 0.5 kg of defoamer, 0.8 kg of dispersant, 30 kg of calcium sulfate, 20 kg of calcite and 5 kg of xanthan gum evenly to obtain inorganic calcium silicate coating; the volatile organic compound content of the coating is ≤0g / L, and the obtained coating is filtered, packaged and put into storage.

Claims

1. An inorganic calcium silicon coating, characterized in that It is composed of the following ingredients by mass: 20-40 parts of dicalcium silicate, 15-20 parts of fine lime powder, 10-25 parts of calcium silicate, 5-15 parts of calcium sulfate, 0.3-2 parts of leveling agent 722, 5-10 parts of titanium dioxide, 0.5-1 parts of xanthan gum, and 0.3-0.7 parts of defoaming agent.

2. The inorganic calcium silicate coating according to claim 1, characterized in that: It is composed of at least the following ingredients in parts by weight: 25-40 parts of dicalcium silicate, 15-20 parts of fine lime powder, 15-20 parts of calcium vanadium, 5-15 parts of calcium sulfate, 0.3-2 parts of leveling agent 722, 6-10 parts of titanium dioxide, 0.5-1 parts of xanthan gum, and 0.3-0.7 parts of defoaming agent.

3. The inorganic calcium silicate coating according to claim 2 further comprises the following ingredients: 20 parts of dicalcium silicate, 15 parts of fine lime powder, 10 parts of calcium vanadium, 5 parts of calcium sulfate, 0.3 parts of leveling agent 722, 5 parts of titanium dioxide, 0.5 parts of xanthan gum, and 0.3 parts of defoaming agent.

4. According to claim 3, add 40 kg of tap water into a stirring tank, then add 35 kg of dicalcium silicate, 5 kg of xanthan gum powder, 0.5 kg of defoaming agent, and 0.7 kg of leveling agent in proportion to the stirring tank and stir evenly at a stirring speed of 30 / min.

5. According to claim 4, 1 kg of fine lime powder, 4 kg of titanium dioxide, 0.2 kg of dispersant, 50 kg of limestone, 10 kg of calcium sulfate, 60 kg of water are added and stirred evenly to obtain the coating; the coating has zero volatile gas, organic compounds (specifically, the test result is about 0g / L), the coating mass loss rate is ≤10%, the hardness is 4H, and it can withstand 6000 washes.

6. According to claim 5, the inorganic calcium silicate coating of the present invention is prepared by the following method: 25 kg of fine lime, 10 kg of xanthan gum and 0.8 kg of dispersant are added into a stirring kettle in proportion and stirred evenly at a stirring speed of 30 / min.

7. According to claim 6, 30 kg of fine lime powder, 10 kg of titanium dioxide, 0.5 kg of defoamer, 0.8 kg of dispersant, 30 kg of calcium sulfate, 20 kg of calcite and 5 kg of xanthan gum are stirred to obtain inorganic calcium silicon coating; the volatile organic compound content of the coating is ≤0g / L, and the obtained coating is filtered, packaged and put into storage.