High-performance fireproof thermal insulation coating and preparation method thereof

Abstract

This invention relates to a high-performance fire-retardant and heat-insulating coating and its preparation method. The high-performance fire-retardant and heat-insulating coating comprises the following raw material components by weight: 30-40 parts inorganic binder, 25-35 parts heat-insulating filler, 10-20 parts flame retardant, 1.5-3.5 parts dispersant, 1.5-3.5 parts defoamer, 1.5-3.5 parts thickener, and 10-20 parts deionized water. Compared with existing products on the market, the high-performance fire-retardant and heat-insulating coating of this invention has excellent fire-retardant and heat-insulating performance, is environmentally friendly and non-toxic, and has excellent application performance, chemical stability, and weather resistance. The production method of this high-performance fire-retardant and heat-insulating coating is also very simple and has low production costs.

Description

Technical Field

[0001] This invention relates to the field of fire-retardant coating technology, and in particular to a high-performance fire-retardant and heat-insulating coating and its preparation method. Background Technology

[0002] Fire-retardant coatings are widely used in construction, petrochemicals, factories, mines, power, and many other fields. Their crucial role is self-evident; fire safety is paramount. Currently, fire-retardant coatings on the market can be broadly classified into organic and inorganic types based on the properties of their matrix materials. While organic fire-retardant and heat-insulating coatings possess some initial heat insulation properties, at high temperatures, the organic components easily decompose and burn, not only losing their fire-retardant and heat-insulating capabilities but also releasing toxic and harmful gases, posing a threat to human health and the environment (for example, traditional acrylic resin-based fire-retardant coatings begin to show significant decomposition at 300℃). On the other hand, most common inorganic fire-retardant and heat-insulating coatings suffer from poor heat insulation performance or poor application properties. For instance, some cement-based fire-retardant coatings, while having good fire resistance, have unsatisfactory heat insulation effects, are hard, difficult to apply evenly during construction, and prone to cracking after drying, thus affecting the overall protective effect. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a dynamic high-performance fireproof and heat-insulating coating and its preparation method, so as to overcome the defects and deficiencies of the existing technology and products as described in the background art.

[0004] The technical solution adopted by this invention to solve its technical problem is: a high-performance fireproof and heat-insulating coating, comprising the following raw material components in parts by weight: 30-40 parts of inorganic binder 25-35 parts of thermal insulation filler 10-20 parts flame retardant 1.5 to 3.5 parts of dispersant 1.5 to 3.5 parts of defoamer Thickener 1.5–3.5 parts 10-20 parts deionized water.

[0005] Preferably, the inorganic binder is potassium silicate or sodium silicate with a modulus of 2.5 to 3.5.

[0006] Preferably, the heat-insulating filler is a mixture of hollow glass microspheres, expanded vermiculite and aerogel powder, and the weight ratio of hollow glass microspheres, expanded vermiculite and aerogel powder is 1:(0.4~0.6):(0.2~0.3).

[0007] Furthermore, the particle size of the hollow glass microspheres is between 5 μm and 50 μm.

[0008] Furthermore, the aforementioned expanded vermiculite has undergone a pre-calcination treatment at 800℃ to 1000℃.

[0009] To elaborate further, the aforementioned aerogel powder is nano-silica aerogel powder.

[0010] Preferably, the flame retardant is a mixture of aluminum hydroxide, magnesium hydroxide and melamine polyphosphate, wherein the weight ratio of aluminum hydroxide, magnesium hydroxide and melamine polyphosphate is 1:(0.7-0.8):(0.7-0.8).

[0011] Preferably, the dispersant is a polycarboxylate dispersant, the defoamer is an organosilicon defoamer, and the thickener is a cellulose ether thickener.

[0012] A method for preparing a high-performance fire-retardant and heat-insulating coating as described above includes the following preparation steps: a. Prepare all the necessary raw materials according to the proportions by weight; b. First, add the inorganic binder into the reactor, and slowly add deionized water while stirring at low speed with the reactor's stirrer. This stirring process should continue for 10 to 15 minutes to ensure the formation of a uniform solution. c. Add the dispersant and defoamer to the reaction vessel in sequence, and continue stirring at low speed for 15 to 20 minutes to ensure that the dispersant and defoamer are evenly dispersed in the solution; d. Add heat-insulating packing to the reactor and simultaneously increase the stirring speed of the reactor's agitator to continue stirring for 30 to 40 minutes to ensure that the heat-insulating packing is uniformly dispersed in the solution; e. Add flame retardant to the reactor and continue stirring for 20 to 30 minutes. f. Add thickener to the reactor, reduce the speed of the agitator and continue stirring for 10 to 15 minutes to obtain the high-performance fireproof and heat-insulating coating.

[0013] Preferably, in step b above, the stirring speed of the reactor is 100 r / min to 200 r / min; in step d above, the stirring speed of the reactor is 300 r / min to 500 r / min; and in step f above, the stirring speed of the reactor is 150 r / min to 250 r / min.

[0014] The beneficial effects of this invention are as follows: Compared with existing products, the high-performance fireproof and heat-insulating coating of this invention has excellent fireproof and heat-insulating performance (through the synergistic effect of inorganic binders, various heat-insulating fillers, and compounded flame retardants, the product can form a stable heat-insulating layer and flame-retardant structure at high temperatures, effectively blocking heat transfer and flame spread; the heating rate on the back of the coating is much lower than that of existing similar coatings, thus providing longer-lasting fireproof and heat-insulating protection), and the product is environmentally friendly and non-toxic (it does not contain volatile organic compounds or toxic and harmful substances, and will not cause harm to human health and the environment during production, construction, and use, meeting environmental protection requirements), and has excellent workability (the product has suitable viscosity and thixotropy, is easy to stir, spray, or brush, can evenly adhere to the surface of various substrates, and the coating is smooth and flat after drying, without sagging, cracking, etc.), chemical stability, and weather resistance (the high proportion of inorganic components gives the coating good chemical stability and weather resistance, and it is not easy to age or deteriorate during long-term use, maintaining stable performance). The production method of this high-performance fireproof and heat-insulating coating is also very simple and the production cost is low. Detailed Implementation

[0015] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are only some, not all, of the embodiments described herein.

[0016] Example 1 A method for preparing a high-performance fire-retardant and heat-insulating coating includes the following preparation steps: a. Prepare 30 kg of potassium silicate with a modulus of 2.5, 16 kg of hollow glass microspheres with a particle size of 5 μm to 15 μm, 6.4 kg of expanded vermiculite calcined at 800℃, 3.2 kg of nano-silica aerogel powder, 4 kg of aluminum hydroxide, 3 kg of magnesium hydroxide, 3 kg of melamine polyphosphate, 1.5 kg of polycarboxylate dispersant, 1.5 kg of organosilicon defoamer, 2 kg of cellulose ether thickener, and 10 kg of deionized water; b. First, add potassium silicate to the reaction vessel, and slowly add deionized water while stirring. Adjust the stirring speed of the reaction vessel to 100 r / min and continue stirring for 10 min to ensure the formation of a homogeneous solution. c. Add polycarboxylate dispersant and silicone defoamer to the reactor in sequence. Continue stirring the reactor at a speed of 100 r / min for 15 min to ensure that the dispersant and defoamer are evenly dispersed in the solution. d. Add hollow glass microspheres, expanded vermiculite and nano silica aerogel powder to the reactor, and adjust the stirring speed of the reactor to 300 r / min and stir continuously for 30 min to ensure that the various heat insulation fillers are uniformly dispersed in the solution; e. Add aluminum hydroxide, magnesium hydroxide and melamine polyphosphate to the reactor, and continue stirring for 20 minutes while maintaining the stirrer speed. f. Add cellulose ether thickener to the reactor, adjust the stirring speed of the reactor to 150 r / min, and stir continuously for 10 min to obtain the high-performance fireproof and heat-insulating coating product.

[0017] Example 2 A method for preparing a high-performance fire-retardant and heat-insulating coating includes the following preparation steps: a. Prepare 35 kg of potassium silicate with a modulus of 3.0, 18 kg of hollow glass microspheres with a particle size of 15 μm to 30 μm, 8 kg of expanded vermiculite calcined at 900℃, 4 kg of nano-silica aerogel powder, 6 kg of aluminum hydroxide, 4.5 kg of magnesium hydroxide, 4.5 kg of melamine polyphosphate, 2.5 kg of polycarboxylate dispersant, 2.5 kg of organosilicon defoamer, 3 kg of cellulose ether thickener, and 15 kg of deionized water; b. First, add potassium silicate to the reaction vessel, and slowly add deionized water while stirring. Adjust the stirring speed of the reaction vessel to 150 r / min and continue stirring for 12 min to ensure the formation of a homogeneous solution. c. Add polycarboxylate dispersant and silicone defoamer to the reactor in sequence. Continue stirring the reactor at a speed of 150 r / min for 18 min to ensure that the dispersant and defoamer are evenly dispersed in the solution. d. Add hollow glass microspheres, expanded vermiculite and nano silica aerogel powder to the reactor, and adjust the stirring speed of the reactor to 400 r / min and stir continuously for 35 min to ensure that the various heat insulation fillers are uniformly dispersed in the solution; e. Add aluminum hydroxide, magnesium hydroxide and melamine polyphosphate to the reactor, and continue stirring for 25 minutes while maintaining the stirrer speed. f. Add cellulose ether thickener to the reactor, adjust the stirring speed of the reactor to 200 r / min, and stir continuously for 13 min to obtain the high-performance fireproof and heat-insulating coating product.

[0018] Example 3 A method for preparing a high-performance fire-retardant and heat-insulating coating includes the following preparation steps: a. Prepare 40 kg of sodium silicate with a modulus of 3.5, 20 kg of hollow glass microspheres with a particle size of 30 μm to 50 μm, 10 kg of expanded vermiculite calcined at 1000℃, 5 kg of nano silica aerogel powder, 8 kg of aluminum hydroxide, 6 kg of magnesium hydroxide, 6 kg of melamine polyphosphate, 3.5 kg of polycarboxylate dispersant, 3 kg of organosilicon defoamer, 3.5 kg of cellulose ether thickener, and 20 kg of deionized water; b. First, add potassium silicate to the reaction vessel, and slowly add deionized water while stirring. Adjust the stirring speed of the reaction vessel to 200 r / min and continue stirring for 15 min to ensure the formation of a uniform solution. c. Add polycarboxylate dispersant and silicone defoamer to the reactor in sequence. Continue stirring the reactor at a speed of 200 r / min for 20 min to ensure that the dispersant and defoamer are evenly dispersed in the solution. d. Add hollow glass microspheres, expanded vermiculite and nano silica aerogel powder to the reactor, and adjust the stirring speed of the reactor to 500 r / min and stir continuously for 40 min to ensure that the various heat insulation fillers are uniformly dispersed in the solution; e. Add aluminum hydroxide, magnesium hydroxide and melamine polyphosphate to the reactor, and continue stirring while maintaining the stirrer speed for 30 minutes; f. Add cellulose ether thickener to the reactor, adjust the stirring speed of the reactor to 250 r / min, and stir continuously for 15 min to obtain the high-performance fireproof and heat-insulating coating product.

[0019] Potassium silicate or sodium silicate with a modulus of 2.5–3.5 exhibits excellent bonding and high-temperature resistance; hollow glass microspheres with a particle size of 5 μm–50 μm effectively reduce the thermal conductivity of coating products; expanded vermiculite calcined at 800℃–1000℃ effectively improves the thermal insulation performance of coating products; nano-silica aerogel powder further enhances the thermal insulation effect of the product; aluminum hydroxide, as a flame retardant, absorbs a large amount of heat during decomposition, thus playing a role in flame retardancy and cooling; magnesium hydroxide decomposes at high temperatures to produce magnesium oxide, thereby forming a dense protective film; melamine polyphosphate forms an expanded char layer during combustion, thus blocking heat and oxygen; polycarboxylate dispersants ensure uniform dispersion of various raw materials; organosilicon defoamers are used to eliminate air bubbles generated during product mixing and application; cellulose ether thickeners ensure good viscosity of the coating product, thus facilitating application.

[0020] Performance testing: The coating products prepared according to the above embodiments were applied to a steel plate with a coating thickness of 0.2 mm to 0.3 mm. After drying, the coating was tested. One side of the steel plate was baked at 1000°C for 30 minutes. The test showed that the coating did not crack or peel off, and the temperature on the back of the steel plate was 180°C, indicating that the coating has excellent fireproof and heat insulation properties.

[0021] The paint was tested for harmful substances, and no formaldehyde, benzene, or other harmful substances were detected, indicating that it meets environmental protection standards.

[0022] In the simulated natural environment aging test, after 500 hours of aging testing, it was found that the coating performance did not decline significantly, indicating that the coating product has excellent chemical stability and weather resistance.

[0023] In addition, during the application process, the coating formed on the board was very uniform, without any drips or bubbles, indicating that the product has good application performance.

[0024] The above embodiments are only used to explain the present invention and are not intended to limit the protection of the present invention. Any non-substantial modifications made based on the essential solution of the present invention should fall within the protection scope of the present invention.

Claims

1. A high-performance fireproof and heat-insulating coating, characterized in that: Includes the following raw material components by weight: 30-40 parts of inorganic binder 25-35 parts of thermal insulation filler 10-20 parts flame retardant 1.5 to 3.5 parts of dispersant 1.5 to 3.5 parts of defoamer Thickener 1.5–3.5 parts 10-20 parts deionized water.

2. The high-performance fireproof and heat-insulating coating according to claim 1, characterized in that: The inorganic binder is potassium silicate or sodium silicate with a modulus of 2.5 to 3.

5.

3. The high-performance fireproof and heat-insulating coating according to claim 1, characterized in that: The heat insulation filler is a mixture of hollow glass microspheres, expanded vermiculite and aerogel powder, with a weight ratio of 1:(0.4-0.6):(0.2-0.3).

4. The high-performance fireproof and heat-insulating coating according to claim 3, characterized in that: The hollow glass microspheres have a particle size of 5μm to 50μm.

5. The high-performance fireproof and heat-insulating coating according to claim 3, characterized in that: The expanded vermiculite is pre-calcined at 800℃ to 1000℃.

6. The high-performance fireproof and heat-insulating coating according to claim 3, characterized in that: The aerogel powder is nano-silica aerogel powder.

7. The high-performance fireproof and heat-insulating coating according to claim 1, characterized in that: The flame retardant is a mixture of aluminum hydroxide, magnesium hydroxide and melamine polyphosphate, with a weight ratio of 1:(0.7-0.8):(0.7-0.8).

8. The high-performance fireproof and heat-insulating coating according to claim 1, characterized in that: The dispersant is a polycarboxylate dispersant, the defoamer is an organosilicon defoamer, and the thickener is a cellulose ether thickener.

9. A method for preparing a high-performance fire-retardant and heat-insulating coating as described in any one of claims 1 to 8, characterized in that: The preparation steps include the following: a. Prepare all the necessary raw materials according to the proportions by weight; b. First, add the inorganic binder into the reactor, and slowly add deionized water while stirring at low speed with the reactor's stirrer. This stirring process should continue for 10 to 15 minutes to ensure the formation of a uniform solution. c. Add the dispersant and defoamer to the reaction vessel in sequence, and continue stirring at low speed for 15 to 20 minutes to ensure that the dispersant and defoamer are evenly dispersed in the solution; d. Add heat-insulating packing to the reactor and simultaneously increase the stirring speed of the reactor's agitator to continue stirring for 30 to 40 minutes to ensure that the heat-insulating packing is uniformly dispersed in the solution; e. Add flame retardant to the reactor and continue stirring for 20 to 30 minutes. f. Add thickener to the reactor, reduce the speed of the agitator and continue stirring for 10 to 15 minutes to obtain the high-performance fireproof and heat-insulating coating.

10. The method for preparing a high-performance fire-retardant and heat-insulating coating according to claim 9, characterized in that: In step b, the stirring speed of the reactor is 100 r / min to 200 r / min; in step d, the stirring speed of the reactor is 300 r / min to 500 r / min; and in step f, the stirring speed of the reactor is 150 r / min to 250 r / min.