Long-acting antibacterial high-temperature-resistant gypsum board and preparation method thereof

Abstract

On one hand, the invention provides the long-acting antibacterial high-temperature-resistant gypsum board, the board core of the gypsum board is coated with the surface protection paper, the surface protection paper is sprayed with the water-based high-temperature-resistant label paint to form the high-temperature-resistant paint layer, and the high-temperature-resistant paint layer is sprayed with the antibacterial agent. The antibacterial agent comprises didecyl methyl [3-(trimethoxysilyl) propyl] ammonium chloride. The plate core is prepared from the following raw materials in parts by weight: 700 to 720 parts of desulfurized building gypsum, 30 to 35 parts of glass fiber, 56 to 60 parts of refractory cement, 18 to 21 parts of calcined bauxite, 2 to 5 parts of organic silicon water repellent, 0.3 to 0.5 part of citric acid, 5 to 7 parts of starch, 42 to 49 parts of white latex and 420 to 430 parts of water. The invention further provides a preparation method of the long-acting antibacterial high-temperature-resistant gypsum board as described in the first aspect. The long-acting antibacterial high-temperature-resistant gypsum board provided by the invention has the advantages of long-acting antibacterial property, high temperature resistance, high strength and the like.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum boards, and in particular to a long-lasting antibacterial and high-temperature resistant gypsum board and a preparation method thereof. Background Art

[0002] Gypsum board has the characteristics of sound insulation, heat insulation, humidity regulation, light weight and low cost, and is widely used as a decorative material in buildings. With the development of society and the advancement of technology, people have higher and higher requirements for the performance of gypsum board, such as the strength of gypsum board, fire resistance, moisture resistance, antibacterial, etc. In order to improve the fire resistance of gypsum board, CN101649671A uses fire-resistant latex paint, CN115195224A uses fire-retardant coating, and CN211257513U uses phosphate fire-retardant coating. However, gypsum itself is a Class A non-combustible material, and the usual fire-retardant coating only maintains the gypsum board as a Class A non-combustible material, and cannot effectively prevent the gypsum board from breaking, spreading or even collapsing quickly under high temperatures of fire (usually 400-800°C) (i.e., fire stability).

[0003] With the occurrence of some public health events, people have also put forward requirements for the antibacterial properties of gypsum boards. CN117865636A uses a single long-chain quaternary ammonium salt composite inorganic antibacterial agent, which is mixed in the gypsum matrix by a physical adsorption loading method. Since it is a physical adsorption loading method, there is still room for improvement in antibacterial persistence.

[0004] The present invention attempts to provide a long-lasting antibacterial, high-temperature resistant, high-strength gypsum board and a preparation method thereof, so as to improve the above-mentioned problems. Summary of the invention

[0005] The present invention attempts to provide a long-lasting antibacterial and high-temperature resistant gypsum board and a preparation method thereof. The long-lasting antibacterial and high-temperature resistant gypsum board has the advantages of long-lasting antibacterial, high-temperature resistance, high strength and the like.

[0006] The first aspect of the present invention provides a long-lasting antibacterial and high-temperature resistant gypsum board, wherein the core of the gypsum board is coated with a face paper, and a water-based high-temperature resistant grade paint is sprayed on the face paper to form a high-temperature resistant paint layer, and an antibacterial agent is sprayed on the high-temperature resistant paint layer. The antibacterial agent comprises didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride. The core is prepared from the following raw materials in parts by weight: 700-720 parts of desulfurized building gypsum, 30-35 parts of glass fiber, 56-60 parts of refractory cement, 18-21 parts of calcined bauxite, 2-5 parts of organosilicon water repellent, 0.3-0.5 parts of citric acid, 5-7 parts of starch, 42-49 parts of white latex, and 420-430 parts of water.

[0007] The water-based high temperature resistant paint can withstand temperatures above 800°C. The antibacterial agent is a 50% solid content didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride ethanol solution. The refractory cement is a calcium magnesium aluminate cement with a refractoriness above 1650°C.

[0008] The second aspect of the present invention provides a method for preparing a long-lasting antibacterial and high-temperature resistant gypsum board as described in the first aspect, and the preparation method comprises the following steps: step 1: uniformly mix the refractory cement and calcined bauxite in parts by weight for standby use; step 2: stir and disperse the water and glass fiber in parts by weight; step 3: add the white latex, starch, citric acid, and silicone water repellent in parts by weight to the mixture obtained in step 2 and stir and mix; step 4: add the mixture obtained in step 1 and the desulfurized building gypsum in parts by weight to the mixture obtained in step 3 and stir and mix to prepare pulp; step 5: wrap the slurry obtained in step 4 with a protective paper and shape it; step 6: evenly spray water-based high-temperature resistant grade paint on the front of the paper-faced gypsum board obtained in step 5, with a spraying amount of 80 to 100 g / m 2 ; Step 7: Dry the gypsum board obtained in step 6 at 180-250°C for 30-60 min; Step 8: After the gypsum board obtained in step 7 is cooled to below 50°C, spray the double long-chain antibacterial agent didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride solution, with a spraying amount of 30-50 g / m 2 After drying, the long-lasting antibacterial and high-temperature resistant gypsum board is obtained.

[0009] The present invention innovatively forms a high-temperature resistant component by mixing calcium magnesium aluminate cement with a refractoriness of more than 1650°C and calcined bauxite with a refractoriness of more than 1500°C with gypsum for solidification, thereby improving both the high-temperature resistance and the strength of the gypsum board; innovatively sprays a water-based high-temperature resistant grade paint with a high temperature resistance of more than 800°C on the face paper, thereby protecting the face paper and the gypsum matrix from being damaged for a long time under high temperature conditions, and cooperating with the refractory cement component inside and outside to ensure that the gypsum board does not break or collapse for a long time when the fire is at high temperature, thereby preventing the spread of the fire; innovatively binds the double long-chain didecylmethyl [3-(trimethoxysilyl)propyl] ammonium chloride firmly to the surface of the gypsum board through chemical bonds, thereby playing a beneficial role of direct antibacterial and long-lasting antibacterial. DETAILED DESCRIPTION

[0010] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0011] The first aspect of the present invention provides a long-lasting antibacterial and high-temperature resistant gypsum board, wherein the core of the gypsum board is coated with a protective paper, and a water-based high-temperature resistant grade paint is sprayed on the protective paper to form a high-temperature resistant paint layer, and an antibacterial agent is sprayed on the high-temperature resistant paint layer. The antibacterial agent comprises didecylmethyl [3- (trimethoxysilyl) propyl] ammonium chloride. The core is prepared from the following raw materials in parts by weight: 700-720 parts of desulfurized building gypsum, 30-35 parts of glass fiber, 56-60 parts of refractory cement, 18-21 parts of calcined bauxite, 2-5 parts of silicone water repellent, 0.3-0.5 parts of citric acid, 5-7 parts of starch, 42-49 parts of white latex, and 420-430 parts of water. The water-based high-temperature resistant grade paint is resistant to high temperatures above 800°C. The antibacterial agent is a didecylmethyl [3- (trimethoxysilyl) propyl] ammonium chloride ethanol solution with a solid content of 50%. Refractory cement is calcium magnesium aluminate cement with a refractoriness above 1650℃.

[0012] The second aspect of the present invention provides a method for preparing a long-lasting antibacterial and high-temperature resistant gypsum board as described in the first aspect of the present invention, and the preparation method comprises the following steps: Step 1: Evenly mix the refractory cement and calcined bauxite in parts by weight for later use; Step 2: Stir and disperse the water and glass fiber in parts by weight; Step 3: Add the white latex, starch, citric acid, and silicone water repellent in parts by weight to the mixture obtained in Step 2 and stir and mix; Step 4: Add the mixture obtained in Step 1 and the desulfurized building gypsum in parts by weight to the mixture obtained in Step 3 and stir and mix to make pulp; Step 5: Wrap the slurry obtained in Step 4 with protective paper and shape it; Step 6: Evenly spray water-based high-temperature resistant grade paint on the front of the paper-faced gypsum board obtained in Step 5, with a spraying amount of 80 to 100 g / m 2 ; Step 7: Dry the gypsum board obtained in step 6 at 180-250°C for 30-60 min; Step 8: After the gypsum board obtained in step 7 is cooled to below 50°C, spray the double long-chain antibacterial agent didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride solution, with a spraying amount of 30-50 g / m 2 After drying, the long-lasting antibacterial and high-temperature resistant gypsum board is obtained.

[0013] In the embodiment of the present invention, the refractory cement is a calcium magnesium aluminate cement with a refractoriness of more than 1650°C. It is mixed with calcined bauxite with a refractoriness of more than 1500°C to form a high temperature resistant component and solidified with gypsum, which not only improves the high temperature resistance of the gypsum board, but also improves the strength of the gypsum board. Glass fiber is used as a reinforcing material to improve the strength of the gypsum board. Environmentally friendly water-based high temperature resistant grade paint is used, which is resistant to high temperatures of more than 800°C and is sprayed on the face paper. Under high temperature conditions of fire (usually 400-800°C), the face paper and the gypsum matrix are protected from being damaged for a long time, and the refractory cement component cooperates inside and outside to ensure that the gypsum board does not break or collapse for a long time when the fire is high temperature, thereby preventing the spread of the fire. The double long-chain antibacterial agent didecylmethyl [3-(trimethoxysilyl)propyl] ammonium chloride attracts negatively charged bacteria through ammonium cations, and uses the double long-chain didecyl to wrap and destroy the bacterial cell wall to sterilize. It is not consumed during the sterilization process and is a long-acting antibacterial agent. The trimethoxysilyl group is easily hydrolyzed and chemically reacts with the hydroxyl group on the surface of the substrate to form a bond. The present invention sprays the double long-chain antibacterial agent on the outermost layer and firmly bonds through chemical reactions, which is completely different from the traditional physical method of mixing or loading in the gypsum substrate. It has the effects of direct antibacterial, long-term antibacterial, and small spraying dosage, which is long-term and economical. Through the synergistic effect of various materials in the technical solution, a long-term antibacterial, high-temperature resistant, high-strength gypsum board is obtained to meet market demand.

[0014] The present invention innovatively forms a high-temperature resistant component by mixing calcium magnesium aluminate cement with a refractoriness of more than 1650°C and calcined bauxite with a refractoriness of more than 1500°C with gypsum for solidification, thereby improving both the high-temperature resistance and the strength of the gypsum board; innovatively sprays a water-based high-temperature resistant grade paint with a high temperature resistance of more than 800°C on the face paper, thereby protecting the face paper and the gypsum matrix from being damaged for a long time under high temperature conditions, and cooperating with the refractory cement component inside and outside to ensure that the gypsum board does not break or collapse for a long time when the fire is at high temperature, thereby preventing the spread of the fire; innovatively binds the double long-chain didecylmethyl [3-(trimethoxysilyl)propyl] ammonium chloride firmly to the surface of the gypsum board through chemical bonds, thereby playing a beneficial role of direct antibacterial and long-lasting antibacterial.

[0015] Example

[0016] Embodiment 1:

[0017] Preparation raw materials: by weight, 700 parts of desulfurized building gypsum, 30 parts of glass fiber, 60 parts of refractory cement, 21 parts of calcined bauxite, 2 parts of organic silicon water repellent, 0.3 parts of citric acid, 5 parts of starch, 42 parts of white latex, and 420 parts of water.

[0018] Preparation process:

[0019] Step 1: Evenly mix the refractory cement and calcined bauxite in parts by weight for later use;

[0020] Step 2: Stir and disperse the water and glass fiber in parts by weight;

[0021] Step 3: adding the weight portions of white latex, starch, citric acid, and silicone water repellent to the mixture obtained in step 2 and stirring and mixing;

[0022] Step 4: adding the mixture obtained in step 1 and the desulfurized building gypsum in parts by weight to the mixture obtained in step 3, stirring and mixing to form a slurry;

[0023] Step 5: Wrap the slurry obtained in step 4 with a protective paper and shape it;

[0024] Step 6: Spray water-based high temperature resistant paint evenly on the front of the gypsum board obtained in step 5, with a spraying amount of 80g / m 2 ;

[0025] Step 7: drying the gypsum board obtained in step 6 at 180-250° C. for 30-60 min;

[0026] Step 8: After the gypsum board obtained in step 7 is cooled to below 50°C, spray the ethanol solution of di-long-chain antibacterial agent didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride with a solid content of 50%, with a spraying amount of 30g / m 2 After drying, the long-lasting antibacterial and high-temperature resistant gypsum board is obtained.

[0027] Embodiment 2:

[0028] Preparation raw materials: by weight, 710 parts of desulfurized building gypsum, 33 parts of glass fiber, 58 parts of refractory cement, 20 parts of calcined bauxite, 3 parts of organic silicon water repellent, 0.5 parts of citric acid, 6 parts of starch, 46 parts of white latex, and 425 parts of water.

[0029] Preparation process:

[0030] Step 1: Evenly mix the refractory cement and calcined bauxite in parts by weight for later use;

[0031] Step 2: Stir and disperse the water and glass fiber in parts by weight;

[0032] Step 3: adding the weight portions of white latex, starch, citric acid, and silicone water repellent to the mixture obtained in step 2 and stirring and mixing;

[0033] Step 4: adding the mixture obtained in step 1 and the desulfurized building gypsum in parts by weight to the mixture obtained in step 3, stirring and mixing to form a slurry;

[0034] Step 5: Wrap the slurry obtained in step 4 with a protective paper and shape it;

[0035] Step 6: Spray water-based high temperature resistant paint evenly on the front of the gypsum board obtained in step 5, with a spraying amount of 90g / m 2 ;

[0036] Step 7: drying the gypsum board obtained in step 6 at 180-250° C. for 30-60 min;

[0037] Step 8: After the gypsum board obtained in step 7 is cooled to below 50°C, spray the ethanol solution of bis-long-chain antibacterial agent didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride with a solid content of 50%, with a spraying amount of 40g / m 2 After drying, the long-lasting antibacterial and high-temperature resistant gypsum board is obtained.

[0038] Embodiment 3:

[0039] Preparation raw materials: by weight, 720 parts of desulfurized building gypsum, 35 parts of glass fiber, 56 parts of refractory cement, 18 parts of calcined bauxite, 5 parts of organic silicon water repellent, 0.4 parts of citric acid, 7 parts of starch, 49 parts of white latex, and 430 parts of water.

[0040] Preparation process:

[0041] Step 1: Evenly mix the refractory cement and calcined bauxite in parts by weight for later use;

[0042] Step 2: Stir and disperse the water and glass fiber in parts by weight;

[0043] Step 3: adding the weight portions of white latex, starch, citric acid, and silicone water repellent to the mixture obtained in step 2 and stirring and mixing;

[0044] Step 4: adding the mixture obtained in step 1 and the desulfurized building gypsum in parts by weight to the mixture obtained in step 3, stirring and mixing to form a slurry;

[0045] Step 5: Wrap the slurry obtained in step 4 with a protective paper and shape it;

[0046] Step 6: Spray water-based high temperature resistant paint evenly on the front of the gypsum board obtained in step 5, with a spraying amount of 100g / m 2 ;

[0047] Step 7: drying the gypsum board obtained in step 6 at 180-250° C. for 30-60 min;

[0048] Step 8: After the gypsum board obtained in step 7 is cooled to below 50°C, spray the ethanol solution of bis-long-chain antibacterial agent didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride with a solid content of 50%, with a spraying amount of 50g / m 2 After drying, the long-lasting antibacterial and high-temperature resistant gypsum board is obtained.

[0049] Gypsum board performance test

[0050] 1. Antibacterial performance The antibacterial performance was carried out in accordance with GB / T 21866-2008. The comparison results are shown in Table 1.

[0051] Table 1 Comparison of antibacterial rate

[0052] project Antimicrobial properties Durability Level I Standard Requirements 99.00 95.00 Level II Standard Requirements 90.00 85.00 Example 1 99.65 98.98 Example 2 99.79 99.15 Example 3 99.90 99.52

[0053] 2. High temperature resistance (fire stability) is carried out in accordance with GB / T 9775-2008, the thickness of the gypsum board is 12.0 mm, and the comparison results are shown in Table 2.

[0054] Table 2 Comparison of fire stability

[0055] project Fire stability / min GB / T9775-2008 standard requirements ≥20 T / ZZB2333-2021 Standard Requirements ≥45 Example 1 ＞200 Example 2 ＞200 Example 3 ＞200

[0056] 3. Mechanical properties are tested in accordance with GB / T 9775-2008. The thickness of the gypsum board is 12.0 mm. The comparison results are shown in Table 3.

[0057] Table 3 Comparison of fracture load

[0058]

[0059] It can be seen from the data in Table 1, Table 2 and Table 3 that the long-lasting antibacterial and high-temperature resistant gypsum board obtained in the embodiment of the present invention performs well in antibacterial performance, high temperature resistance and strength, and is superior to similar products in the industry.

[0060] In the description of the present invention, it is necessary to understand that the terms “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0061] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A long-lasting antibacterial and high-temperature resistant gypsum board, characterized in that: The core of the gypsum board is covered with face paper, water-based high-temperature resistant grade paint is sprayed on the face paper to form a high-temperature resistant paint layer, and an antibacterial agent is sprayed on the high-temperature resistant paint layer.

2. The long-lasting antibacterial and high-temperature resistant gypsum board according to claim 1, characterized in that: The antimicrobial agent comprises didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride.

3. The long-lasting antibacterial and high-temperature resistant gypsum board according to claim 2, characterized in that: The board core is prepared from the following raw materials in parts by weight: 700-720 parts of desulfurized building gypsum, 30-35 parts of glass fiber, 56-60 parts of refractory cement, 18-21 parts of calcined bauxite, 2-5 parts of organic silicon water repellent, 0.3-0.5 parts of citric acid, 5-7 parts of starch, 42-49 parts of white latex, and 420-430 parts of water.

4. The long-lasting antibacterial and high-temperature resistant gypsum board according to claim 3, characterized in that: Water-based high temperature resistant paint can withstand temperatures above 800°C.

5. The long-lasting antibacterial and high-temperature resistant gypsum board according to claim 4, characterized in that: The antibacterial agent is a didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride ethanol solution with a solid content of 50%.

6. The long-lasting antibacterial and high-temperature resistant gypsum board according to claim 5, characterized in that: Refractory cement is calcium magnesium aluminate cement with a refractoriness above 1650℃.

7. A method for preparing the long-lasting antibacterial and high-temperature resistant gypsum board as claimed in claim 6, characterized in that: The preparation method comprises the following steps: Step 1: Evenly mix the refractory cement and calcined bauxite in parts by weight for later use; Step 2: Stir and disperse the water and glass fiber in parts by weight; Step 3: adding the weight portions of white latex, starch, citric acid, and silicone water repellent to the mixture obtained in step 2 and stirring and mixing; Step 4: adding the mixture obtained in step 1 and the desulfurized building gypsum in parts by weight to the mixture obtained in step 3, stirring and mixing to form a slurry; Step 5: Wrap the slurry obtained in step 4 with a protective paper and shape it; Step 6: Spray water-based high temperature resistant paint evenly on the front of the gypsum board obtained in step 5, with a spraying amount of 80-100g / m 2 ; Step 7: drying the gypsum board obtained in step 6 at 180-250° C. for 30-60 min; Step 8: After the gypsum board obtained in step 7 is cooled to below 50°C, spray the double long-chain antibacterial agent didecylmethyl[3-(trimethoxysilyl)propyl]ammonium chloride solution at a spraying amount of 30-50g / m 2 After drying, the long-lasting antibacterial and high-temperature resistant gypsum board is obtained.

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