Environment-friendly crusting type fireproof refractory mortar and preparation process thereof

Abstract

The invention discloses environment-friendly crusting type fireproof refractory mortar and a preparation process thereof, and belongs to the field of fireproof materials. The environment-friendly crusting type fireproof refractory mortar comprises the following raw materials in parts by weight: 20-35 parts of methyl vinyl silicone rubber 610000; 15 to 25 parts of precipitated white carbon black; 25 to 40 parts of aluminum hydroxide; 10 to 18 parts of nano wollastonite powder; 2-5 parts of stearic acid; 3 to 8 parts of dimethyl silicone oil; and 5-12 parts of a composite flame retardant material. The environment-friendly crusting type fireproof refractory mortar adopts various environment-friendly raw materials, and through a reasonable formula and a specific preparation process, the environment-friendly crusting type fireproof refractory mortar has good fireproof and fire-resistant performance, processing performance and environment-friendly performance. All the raw materials cooperate with one another in a specific weight part range and play a synergistic role. According to the preparation process, the stable quality of the fireproof refractory mortar is ensured by controlling the stirring speed and time and environmental conditions, and the preparation process is simple, easy for industrial production, relatively reasonable in cost and convenient for large-scale popularization and application.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fireproof materials, in particular to an environmentally friendly crust type fireproof refractory mortar and its preparation process. BACKGROUND

[0002] Fire is a highly destructive disaster, which not only poses a serious threat to people's life safety, but also brings huge economic losses to society. With the acceleration of urbanization and the continuous increase of various buildings and facilities, fire safety issues have been increasingly concerned by people. As a key substance for preventing and controlling the spread of fire, fireproof refractory materials play an indispensable role in many fields such as construction, power, chemical industry, transportation, etc.

[0003] Application and limitations of traditional fireproof refractory mortar

[0004] In the past, traditional fireproof refractory mortar has been widely used in various fireproof plugging, fireproof isolation and other scenarios. For example, in construction, it is used to fill cable wall holes, pipe gaps and other parts to prevent the spread of fire and smoke; in power facilities, it is used to wrap cables, transformers and other equipment to improve their fireproof performance. However, traditional fireproof refractory mortar has many limitations.

[0005] In terms of performance, its fireproof and refractory performance is not ideal. In high temperature environment, some traditional fireproof refractory mortar is prone to cracking, falling off and other phenomena, which greatly reduces the fireproof isolation effect. For example, in some fire accidents, due to the cracking of fireproof refractory mortar, flames and high temperature smoke quickly spread through the gap, making the fire spread faster and causing great difficulties for personnel evacuation and fire fighting.

[0006] In terms of environmental protection, traditional fireproof refractory mortar often contains some substances harmful to the environment and human body. For example, some products add heavy metal compounds containing lead, mercury and other heavy metals, which can pollute soil, water and other substances during production, use and disposal, and also release toxic and harmful gases during a fire, posing a threat to the health of on-site personnel and the safety of rescue personnel. In addition, the production process of some traditional fireproof refractory mortar has high energy consumption, which does not meet the current requirements of energy saving and emission reduction and sustainable development.

[0007] Deficiencies of existing improved fireproof refractory materials

[0008] In order to overcome the shortcomings of traditional fireproof refractory mortar, some improved fireproof refractory materials have been developed in recent years. Some of these materials add new flame retardants to improve fireproof performance, or use environmentally friendly raw materials to reduce environmental hazards. However, these improved materials still have some deficiencies.

[0009] On the one hand, while some improved fire-retardant materials offer enhanced fire resistance, they perform poorly in other areas. For example, some materials add large amounts of inorganic fillers to improve flame retardancy, resulting in decreased flexibility and adhesion, making them difficult to apply and prone to separating from the protected object, thus affecting the durability of the fire-retardant effect. On the other hand, the high production cost of some environmentally friendly fire-retardant materials limits their large-scale application. Due to raw material costs and complex production processes, these materials are often much more expensive than traditional fire-retardant putty, deterring many users from choosing them.

[0010] Therefore, those skilled in the art provide an environmentally friendly crust-forming fireproof and refractory mortar and its preparation process to solve the problems mentioned in the background art. Summary of the Invention

[0011] The purpose of this invention is to provide an environmentally friendly crust-forming fireproof and refractory mortar and its preparation process, so as to solve the problems mentioned in the background art.

[0012] To achieve the above objectives, the present invention provides the following technical solution:

[0013] An environmentally friendly crust-forming fireproof and refractory mortar and its preparation process, comprising the following raw materials in parts by weight:

[0014] Methyl vinyl silicone rubber - 610,000: 20-35 parts;

[0015] Precipitated silica: 15-25 parts;

[0016] Aluminum hydroxide: 25-40 parts;

[0017] Nano-wollastonite powder: 10-18 parts;

[0018] Stearic acid: 2-5 parts;

[0019] Dimethyl silicone oil: 3-8 parts;

[0020] Composite material flame retardant: 5-12 parts.

[0021] As a further aspect of the present invention: the methyl vinyl silicone rubber-610,000 is a linear polysiloxane with a vinyl content of 0.05-0.2 mol%; the precipitated silica is fumed silica or precipitated silica with a specific surface area of ​​150-250 m² / g.

[0022] As a further embodiment of the present invention: the aluminum hydroxide is industrial-grade aluminum hydroxide with an average particle size of 1-10 μm; the nano-wollastonite powder is needle-shaped nano-wollastonite powder with an aspect ratio of 10-20.

[0023] As a further aspect of the present invention: the stearic acid is industrial-grade stearic acid with a purity of ≥98%.

[0024] As a further embodiment of the present invention: the dimethyl silicone oil is a dimethyl silicone oil with a kinematic viscosity of 50-200 mm² / s; the composite material flame retardant is a mixture of magnesium hydroxide and expandable graphite in a 3:1 ratio, wherein the average particle size of magnesium hydroxide is 2-15 μm, the whiteness is ≥90%, the expansion ratio is 200-300 times, and the particle size of expandable graphite is 100-300 mesh.

[0025] A preparation process for an environmentally friendly crust-forming fireproof and refractory mortar, characterized by comprising the following steps:

[0026] Step S1: Place the methyl vinyl silicone rubber-610,000 into a mixing device and stir at a speed of 100-150 rpm for 10-15 minutes to disperse it evenly.

[0027] Step S2: Add precipitated silica, aluminum hydroxide, and nano wollastonite powder in sequence, and continue stirring at 120-180 rpm for 15-25 minutes to ensure that all components are fully mixed.

[0028] Step S3: Add stearic acid and dimethyl silicone oil, and stir at 100-130 rpm for 8-12 minutes to improve the processing performance of the material;

[0029] Step S4: Finally, add the composite material fire retardant and stir at 80-110 rpm for 10-15 minutes until a uniform fireproof and refractory mortar is formed.

[0030] As a further aspect of the present invention, the mixing equipment should be selected with good sealing and corrosion resistance to prevent the raw materials from being contaminated or the equipment from being corroded during the mixing process.

[0031] As a further aspect of the present invention, the preparation process should be carried out at room temperature and relative humidity of 40%-60% to ensure the stability of the performance of the fireproof and refractory mortar.

[0032] As a further aspect of the present invention: after each raw material is added, the mixing state of the raw materials in the mixing equipment should be checked to ensure that there is no obvious clumping or stratification.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] This invention relates to an environmentally friendly, crust-forming fireproof and refractory mortar. It utilizes a variety of environmentally friendly raw materials, employing a rational formula and specific preparation process to achieve excellent fireproof and refractory properties, processability, and environmental performance. The raw materials work synergistically within specific weight proportions. The preparation process, by controlling the stirring speed and time, as well as environmental conditions, ensures stable quality of the fireproof and refractory mortar. Furthermore, the preparation process is simple, easy to industrialize, relatively cost-effective, and suitable for large-scale application. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] Weigh out the following components by weight: 25 parts of methyl vinyl silicone rubber-610,000, 20 parts of precipitated silica, 30 parts of aluminum hydroxide, 12 parts of nano-wollastonite powder, 3 parts of stearic acid, 5 parts of dimethyl silicone oil, and 8 parts of composite material flame retardant. The vinyl content of methyl vinyl silicone rubber-610,000 is 0.1 mol%; the precipitated silica is precipitated silica with a specific surface area of ​​200 m² / g; the average particle size of aluminum hydroxide is 5 μm; the aspect ratio of nano-wollastonite powder is 15; the purity of stearic acid is 98%; the kinematic viscosity of dimethyl silicone oil is 100 mm² / s; and the composite material flame retardant is a mixture of magnesium hydroxide and expandable graphite in a 3:1 ratio.

[0038] Methyl vinyl silicone rubber-610,000 was placed in a mixing device and stirred at 120 rpm for 12 minutes to ensure uniform dispersion. Precipitated silica, aluminum hydroxide, and nano-wollastonite powder were added sequentially, and stirred at 150 rpm for 20 minutes. Stearic acid and dimethyl silicone oil were added, and stirred at 110 rpm for 10 minutes. Finally, composite flame retardant material was added, and stirred at 90 rpm for 12 minutes to form an environmentally friendly, crust-type fireproof and refractory mortar.

[0039] Example 2

[0040] Weigh out the following components by weight: 30 parts of methyl vinyl silicone rubber-610,000, 18 parts of precipitated silica, 35 parts of aluminum hydroxide, 15 parts of nano-wollastonite powder, 4 parts of stearic acid, 6 parts of dimethyl silicone oil, and 10 parts of composite material flame retardant. The vinyl content of methyl vinyl silicone rubber-610,000 is 0.15 mol%; the precipitated silica is fumed silica with a specific surface area of ​​180 m² / g; the average particle size of aluminum hydroxide is 3 μm; the aspect ratio of nano-wollastonite powder is 18; the purity of stearic acid is 99%; the kinematic viscosity of dimethyl silicone oil is 150 mm² / s; and the composite material flame retardant is a mixture of magnesium hydroxide and expandable graphite in a 3:1 ratio.

[0041] Methyl vinyl silicone rubber-610,000 was placed in a mixing device and stirred at 130 rpm for 13 minutes. Then, precipitated silica, aluminum hydroxide, and nano-wollastonite powder were added, and the mixture was stirred at 160 rpm for 22 minutes. Next, stearic acid and dimethyl silicone oil were added, and the mixture was stirred at 120 rpm for 9 minutes. Finally, the composite flame retardant material was added, and the mixture was stirred at 100 rpm for 13 minutes to obtain the fire-retardant mortar.

[0042] Example 3

[0043] Weigh out the following components by weight: 22 parts of methyl vinyl silicone rubber-610,000, 22 parts of precipitated silica, 28 parts of aluminum hydroxide, 10 parts of nano-wollastonite powder, 2 parts of stearic acid, 3 parts of dimethyl silicone oil, and 5 parts of composite material flame retardant. The vinyl content of methyl vinyl silicone rubber-610,000 is 0.08 mol%; the precipitated silica is precipitated silica with a specific surface area of ​​220 m² / g; the average particle size of aluminum hydroxide is 8 μm; the aspect ratio of nano-wollastonite powder is 12; the purity of stearic acid is 98%; the kinematic viscosity of dimethyl silicone oil is 80 mm² / s; and the composite material flame retardant is a mixture of magnesium hydroxide and expandable graphite in a 3:1 ratio.

[0044] Methyl vinyl silicone rubber-610,000 was added to a mixing device and stirred at 100 rpm for 10 minutes. Then, precipitated silica, aluminum hydroxide, and nano-wollastonite powder were added sequentially, and stirred at 120 rpm for 15 minutes. Stearic acid and dimethyl silicone oil were added and stirred for 8 minutes. Finally, composite flame retardant material was added and stirred for 10 minutes to obtain an environmentally friendly crust-type fireproof and refractory mortar.

[0045] Comparative Example

[0046] A common traditional fireproof and refractory putty on the market was selected as a comparison example. Its main components are ordinary silicone rubber, talc, calcium carbonate, and a small amount of flame retardant.

[0047] Performance testing and comparison

[0048] The performance of the fire-retardant and refractory mortars prepared in Examples 1-3 and the conventional fire-retardant and refractory mortars in the comparative examples was tested, and the results are shown in the table below: Performance indicators Example 1 Example 2 Example 3 Comparative example Fire resistance limit (hours) 3.5 4.0 3.0 2.0 Compressive strength (MPa) 4.2 4.5 3.8 3.0 High temperature crack resistance (800°C, 2 hours) Few fine cracks Essentially no cracks Few cracks Large number of through cracks Environmental performance (heavy metal content) Complies with standard Complies with standard Complies with standard Partially exceeds standard Bonding strength (concrete, MPa) 1.8 2.0 1.5 1.0 Bonding strength (steel, MPa) 1.5 1.7 1.3 0.8 Bonding strength (wood, MPa) 1.2 1.4 1.0 0.6

[0049] The data in the table above clearly shows that the environmentally friendly crust-type fireproof and refractory mortar prepared in this embodiment of the invention is superior to the traditional fireproof and refractory mortar in the comparative example in terms of fire resistance limit, compressive strength, high-temperature crack resistance, environmental performance, and bonding strength. This fully demonstrates that the fireproof and refractory mortar of this invention has superior performance and environmental advantages, and can better meet the fireproof and refractory requirements in practical applications.

[0050] In summary, the environmentally friendly crust-forming fireproof and refractory mortar and its preparation process of this invention have broad application prospects and can meet the needs of different fields for fireproof and refractory materials. Different formulation ratios and preparation parameters will cause the fireproof and refractory mortar to exhibit different properties, which can be adjusted according to the actual application scenario.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An environmentally friendly, crust-forming type fireproof and refractory mortar, characterized in that: Includes the following raw materials by weight: Methyl vinyl silicone rubber - 610,000: 20-35 parts; Precipitated silica: 15-25 parts; Aluminum hydroxide: 25-40 parts; Nano-wollastonite powder: 10-18 parts; Stearic acid: 2-5 parts; Dimethyl silicone oil: 3-8 parts; Composite material flame retardant: 5-12 parts.

2. The environmentally friendly crust-forming fireproof and refractory mortar according to claim 1, characterized in that: The methyl vinyl silicone rubber-610,000 is a linear polysiloxane with a vinyl content of 0.05-0.2 mol%; the precipitated silica has a specific surface area of ​​150-250. Fumed silica or precipitated silica.

3. The environmentally friendly crust-forming fireproof and refractory mortar according to claim 1, characterized in that, The aluminum hydroxide is industrial-grade aluminum hydroxide with an average particle size of 1-10 μm; the nano-wollastonite powder is needle-shaped nano-wollastonite powder with an aspect ratio of 10-20.

4. The environmentally friendly crust-forming fireproof and refractory mortar according to claim 1, characterized in that, The stearic acid is industrial-grade stearic acid with a purity of ≥98%.

5. The environmentally friendly crust-forming fireproof and refractory mortar according to claim 1, characterized in that, The dimethyl silicone oil has a kinematic viscosity of 50-200. The composite material is a mixture of magnesium hydroxide and expandable graphite in a 3:1 ratio, wherein the average particle size of magnesium hydroxide is 2-15 μm, the whiteness is ≥90%, the expansion ratio is 200-300 times, and the particle size of expandable graphite is 100-300 mesh.

6. A preparation process for the environmentally friendly crust-type fireproof and refractory mortar as described in any one of claims 1-5, characterized in that, Includes the following steps: Step S1: Place the methyl vinyl silicone rubber-610,000 into a mixing device and stir at a speed of 100-150 rpm for 10-15 minutes to disperse it evenly. Step S2: Add precipitated silica, aluminum hydroxide, and nano wollastonite powder in sequence, and continue stirring at 120-180 rpm for 15-25 minutes to ensure that the components are fully mixed. Step S3: Add stearic acid and dimethyl silicone oil, and stir at 100-130 rpm for 8-12 minutes to improve the processing performance of the material; Step S4: Finally, add the composite material fire retardant and stir at 80-110 rpm for 10-15 minutes until a uniform fireproof and refractory mortar is formed.

7. The preparation process of the environmentally friendly crust-type fireproof and refractory mortar according to claim 6, characterized in that, The mixing equipment should be selected with good sealing and corrosion resistance to prevent the raw materials from being contaminated or the equipment from being corroded during the mixing process.

8. The preparation process of the environmentally friendly crust-type fireproof and refractory mortar according to claim 6, characterized in that, The preparation process should be carried out at room temperature and relative humidity of 40%-60% to ensure the stability of the fireproof and refractory putty performance.

9. The preparation process of the environmentally friendly crust-type fireproof and refractory mortar according to claim 6, characterized in that, After each raw material is added, the mixing state of the raw materials in the mixing equipment should be checked to ensure that there is no obvious clumping or stratification.