High-strength flame-retardant gypsum plaster board and manufacturing method thereof

Abstract

The invention discloses a high-strength gypsum plaster board and a manufacturing method and belongs to the technical field of artificial board production and manufacturing. Adding the gypsum powder and the water reducing agent into a stirrer according to a preset proportion, and mixing for 3-5 minutes under a low-speed stirring condition to ensure that the water reducing agent fully wets the surface of the gypsum powder; gradually adding the nanometer material into the stirrer, increasing the stirring speed to 150-200 revolutions per minute, and continuously stirring for 10-15 minutes, so that the nanometer material forms a uniform dispersion system in the gypsum matrix; meanwhile, a gypsum reinforcing agent, glass fibers and a defoaming agent are added and jointly and uniformly stirred; and pouring the stirred slurry into surface protection paper, carrying out filter pressing molding, and drying to obtain the high-strength flame-retardant gypsum board. And the nano silicon dioxide also has a remarkable improvement effect on the properties such as waterproofness and durability of the gypsum board. The high specific surface area and microscopic filling effect can effectively fill the pore structure in the gypsum matrix, and reduce the moisture permeability, thereby improving the waterproof performance of the gypsum board.

Description

TECHNICAL FIELD

[0001] The application relates to a high-strength fire-retardant paper-faced gypsum board and a manufacturing method, and belongs to the technical field of artificial board production and manufacturing. BACKGROUND

[0002] High-strength gypsum board is a kind of building decoration material made of gypsum as the main raw material through a specific process, which has excellent mechanical properties and low environmental load. Its traditional manufacturing process usually includes the steps of raw material crushing, heating and dewatering, mixing and stirring, forming and curing, etc., finally forming a board with certain strength and durability. Compared with ordinary gypsum board, high-strength gypsum board performs more outstandingly in compressive strength and bending strength, and is widely used in indoor partition walls, suspended ceilings and decorative panels. However, the existing high-strength gypsum board still has certain limitations in actual application. For example, due to its high porosity, it has a large water absorption rate, which affects its waterproof performance and long-term use stability; in addition, the fire resistance and antibacterial properties of traditional high-strength gypsum board are relatively weak, which is difficult to meet the needs of high-end buildings or special environments. The existence of these problems prompts researchers to explore new modification technologies to further improve the comprehensive performance of high-strength gypsum board. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the application provides a high-strength fire-retardant paper-faced gypsum board and a manufacturing method.

[0004] A high-strength fire-retardant paper-faced gypsum board comprises face paper, gypsum powder, nanomaterial, reinforcing agent, glass fiber, water reducing agent and defoaming agent.

[0005] The weight component ratio is as follows:

[0006] Gypsum powder 90-100,

[0007]

[0008] The nanomaterial is preferably nanosilica and nanozinc oxide.

[0009] The reinforcing agent is preferably BYER BE-0326 type reinforcing agent.

[0010] The water reducing agent preferably uses one or more of aliphatic or polycarboxylic acid water reducing agents.

[0011] The defoaming agent is preferably a mineral oil polyol composite defoaming agent.

[0012] A high-strength fire-retardant paper-faced gypsum board manufacturing method comprises the following steps:

[0013] Step 1: Add gypsum powder and water reducing agent into a stirrer according to the predetermined ratio, and mix for 3-5 minutes under low-speed stirring conditions to ensure that the water reducing agent fully wets the surface of the gypsum powder.

[0014] Step 2, gradually add the nanomaterials into the mixer and increase the stirring speed to 150-200 rpm, continue stirring for 10-15 minutes to form a uniform dispersion system of nanomaterials in the gypsum matrix.

[0015] Step 3, simultaneously add gypsum reinforcing agent, glass fiber, and defoaming agent and stir until uniform.

[0016] Step 4, pour the stirred slurry into the cover paper, press and filter to form, and dry to obtain the high-strength and fire-retardant gypsum board.

[0017] Nano-silicon dioxide (nano-SiO2) has a high specific surface area and surface activity, which can significantly enhance the strength of the gypsum matrix. Its unique physical and chemical properties enable it to form a tight interface with the gypsum matrix, effectively improving the compressive and bending strength of the gypsum board.

[0018] The high specific surface area of nano-silicon dioxide particles provides more contact points for chemical reactions between them and the hydration products of gypsum, promoting the formation and strengthening of the interfacial transition zone.

[0019] In addition, the hydroxyl functional groups on the surface of nano-silicon dioxide can chemically bond with calcium ions in gypsum, further enhancing the interfacial adhesion. This chemical bonding not only improves the overall mechanical properties of the gypsum board, but also significantly improves its durability. When the dosage of nano-silicon dioxide is controlled within an appropriate range, the compressive strength of the gypsum board can be increased by more than 20%, and the bending strength can be increased by about 30%.

[0020] In addition to enhancing strength, nano-silicon dioxide also has a significant improvement on the waterproofness and durability of the gypsum board. Its high specific surface area and micro-filling effect can effectively fill the pore structure in the gypsum matrix, reducing water permeability and improving the waterproofness of the gypsum board.

[0021] Tests have shown that the addition of nano-silicon dioxide can significantly reduce the number of connected pores in the hardened gypsum body and optimize the pore size distribution, greatly improving the stability of the gypsum board in a humid environment. In addition, the introduction of nano-silicon dioxide can also enhance the ability of the gypsum board to resist chemical corrosion and prolong its service life.

[0022] For example, in an acidic environment, nano-silica can slow down the erosion rate of hydrogen ions on the gypsum matrix through physical barrier effect, thereby improving its acid resistance. At the same time, the photocatalytic properties of nano-silica also provide additional value for its application in gypsum board. Under ultraviolet light, nano-silica can decompose part of the organic pollutants, thereby improving the self-cleaning ability of the gypsum board to some extent. These comprehensive performance improvements make nano-silica an indispensable functional additive in the preparation of high-strength gypsum board.

[0023] Nano-zinc oxide (nano-ZnO) has excellent thermal stability and flame retardant properties, and can significantly improve the fireproof performance of high-strength gypsum board.

[0024] In a high-temperature environment, nano-zinc oxide can inhibit flame propagation and delay material decomposition through multiple mechanisms.

[0025] First, nano-zinc oxide has high thermal conductivity, which can quickly transfer heat to the surrounding environment, thereby reducing the temperature rise rate on the surface of the gypsum board.

[0026] Second, nano-zinc oxide releases water vapor and zinc oxide gas during heating, which can dilute the concentration of flammable gases and form a protective film on the surface of the gypsum board, effectively isolating oxygen from the substrate.

[0027] In addition, nano-zinc oxide has a small particle size and a large specific surface area, which can form a uniform network structure in the gypsum matrix, further enhancing the thermal stability of the gypsum board.

[0028] Experimental results show that high-strength gypsum board with appropriate amount of nano-zinc oxide has significantly shortened combustion time in flame test, and the fireproofing grade has been improved from B to A, showing excellent flame retardant effect.

[0029] By using nano materials such as nano-silicon dioxide (Nano-SiO2) and nano-zinc oxide (Nano-ZnO) to prepare high-strength gypsum board, the shortcomings of existing gypsum board in mechanical properties and functionality are solved.

[0030] Nano-zinc oxide significantly enhances the strength of the gypsum board and improves its water resistance and durability through its high specific surface area and surface activity; nano-silicon dioxide improves the fireproofing performance of the gypsum board and endows it with antibacterial and self-cleaning functions.

[0031] Compared with traditional modification methods, the present application has the following innovations: first, the high specific surface area and surface activity of nano-silicon dioxide can significantly improve the compressive strength and bending strength of the gypsum board, while improving its waterproof performance; second, the introduction of nano-zinc oxide not only improves the fire resistance grade of the gypsum board, but also endows it with antibacterial and self-cleaning functions, thereby meeting the needs of high-end buildings and special environments. In addition, the present application realizes the uniform dispersion of nano-materials in the gypsum matrix by optimizing the addition ratio and preparation process of nano-materials, thereby effectively avoiding the performance decline problem caused by agglomeration. This unique perspective provides a new idea for solving the performance bottleneck of existing gypsum boards and is expected to promote the widespread application of high-strength gypsum boards in the construction industry. DETAILED DESCRIPTION

[0032] Obviously, many modifications and changes based on the purpose of the present application can be made by those skilled in the art, which belong to the protection scope of the present application.

[0033] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the use of the word "comprise" in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element, component is said to be "connected" to another element or component, it can be directly connected to the other element or component, or there can be an intermediate element or component. The phrase "and / or" used herein includes any one of the associated listed items and all combinations of the associated listed items.

[0034] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art.

[0035] In order to facilitate the understanding of the embodiments, the following will be further explained in conjunction with the embodiments, and each embodiment does not constitute a limitation on the present application.

[0036] Embodiment 1: A manufacturing method of a high-strength face-resistant gypsum board, and the weight ratio of the ingredients of the high-strength face-resistant gypsum board is as follows:

[0037]

[0038] The nano-materials are nano-zinc oxide and nano-silicon dioxide.

[0039] The gypsum reinforcing agent is preferably BAYER BE-0326 type reinforcing agent.

[0040] The water reducing agent is preferably one or more of aliphatic or polycarboxylic acid water reducing agents.

[0041] The defoaming agent is preferably a mineral oil polyol composite defoaming agent.

[0042] The preparation method of the gypsum reinforcing agent (BE-0326 type) is as follows:

[0043] Step 1, add weighed water into the reactor, then heat to 80-100 degrees Celsius, then add 10-30 parts of starch, and keep warm for 30-60 min.

[0044] Step 2, add weighed urea 0.1-5 parts into the reactor, and continue amination for 30-60 min.

[0045] Step 3, add weighed PVA glue powder 1-15 parts into the reactor, and continue reaction for 30-60 min.

[0046] Step 4, cool down to below 50℃, add weighed borax 0.1-2 parts into the reactor, and react for 30-60 min.

[0047] Step 5, add HCL 1-5 parts, adjust the PH value to neutral, and gypsum reinforcing agent is obtained.

[0048] A manufacturing method of high-strength fire-resistant gypsum board, comprising the following steps:

[0049] Step (1), add 0.1 parts of water reducing agent and 90 parts of gypsum powder into the mixer, mix for 3-5 minutes under low-speed stirring condition to ensure that the water reducing agent fully wets the surface of the gypsum powder;

[0050] Step (2), add 0.1 parts of nano zinc oxide and 0.5 parts of nano silicon dioxide into the mixer gradually, and increase the stirring speed to 150-200 revolutions per minute, and continue stirring for 10-15 minutes to form a uniform dispersion system of nano materials in the gypsum matrix;

[0051] Step (3), add 0.1 parts of gypsum reinforcing agent, 0.1 parts of glass fiber and 0.1 parts of defoaming agent into the above slurry and stir uniformly;

[0052] Step (4), pour the stirred slurry into the facing paper, press filter into shape, and dry to obtain the high-strength fire-resistant gypsum board.

[0053] The high-strength fire-resistant gypsum board of the present application is compared with the ordinary gypsum board

[0054]

[0055]

[0056] Example 2: A method for manufacturing a high-strength gypsum board,

[0057] The ingredient weight ratio of the high-strength gypsum board:

[0058]

[0059] The steps include:

[0060] Step (1), 0.09 parts of water reducing agent and 95 parts of gypsum powder are added into a mixer, and mixed for 3-5 minutes under low-speed stirring conditions to ensure that the water reducing agent fully wets the surface of the gypsum powder;

[0061] Step (2), 1.2 parts of nano-zinc oxide and 1.4 parts of nano-silicon dioxide are gradually added into the mixer, and the stirring speed is increased to 150-200 revolutions per minute, and the stirring is continued for 10-15 minutes, so that the nano-materials form a uniform dispersion system in the gypsum matrix;

[0062] Step (3), 0.18 parts of gypsum reinforcing agent, 0.2 parts of glass fiber, and 0.4 parts of defoaming agent are added into the above slurry and uniformly stirred;

[0063] Step (4), the stirred slurry is poured into a cover paper, and is formed by pressure filtration and dried to obtain the high-strength fire-resistant gypsum board.

[0064] Example 3: A method for manufacturing a high-strength gypsum board, and the ingredient weight ratio of the high-strength gypsum board:

[0065]

[0066]

[0067] The steps include:

[0068] Step (1), 0.15 parts of water reducing agent and 100 parts of gypsum powder are added into a mixer, and mixed for 3-5 minutes under low-speed stirring conditions to ensure that the water reducing agent fully wets the surface of the gypsum powder;

[0069] Step (2), 1 part of nano-zinc oxide and 2 parts of nano-silicon dioxide are gradually added into the mixer, and the stirring speed is increased to 150-200 revolutions per minute, and the stirring is continued for 10-15 minutes, so that the nano-materials form a uniform dispersion system in the gypsum matrix;

[0070] Step (3), 0.2 parts of gypsum reinforcing agent, 0.3 parts of glass fiber, and 0.5 parts of defoaming agent are added into the above slurry and uniformly stirred;

[0071] Step (4), the stirred slurry is poured into a cover paper, and is formed by pressure filtration and dried to obtain the high-strength fire-resistant gypsum board.

[0072] While the embodiments of the present application have been described in detail, it should be apparent that various changes can be made without departing from the spirit and scope of the application in its broadest aspects. Accordingly, the detailed description is to be construed only as illustrative of the present application and not in a limiting sense, and the scope of the present application should be measured only by reference to the following claims appropriately interpreted in accordance with the doctrine of equivalents.

Claims

1. A high-strength flame-retardant paper-faced gypsum board, comprising facing paper, gypsum powder, nanomaterials, reinforcing agent, glass fiber, water-reducing agent, and defoamer, characterized in that: The weight group distribution is as follows: The nanomaterials are nano-silica and nano-zinc oxide.

2. The high-strength flame-retardant paper-faced gypsum board according to claim 1, characterized in that, The preferred nanomaterials are nano-silica and nano-zinc oxide.

3. The method for manufacturing a high-strength flame-retardant paper-faced gypsum board according to claim 1, characterized in that, The reinforcing agent is Bayer BE-0326, the water-reducing agent is one or more of aliphatic or polycarboxylate water-reducing agents, and the defoamer is mineral oil polyol composite defoamer.

4. A method for manufacturing a high-strength flame-retardant paper-faced gypsum board according to claim 1, claim 2, or claim 3, characterized in that, Includes the following steps: Step 1: Add gypsum powder and water-reducing agent to a mixer in a predetermined ratio, and mix for 3-5 minutes under low speed to ensure that the water-reducing agent fully wets the surface of the gypsum powder. Step 2: Gradually add the nanomaterials to the mixer, increase the mixing speed to 150-200 rpm, and continue mixing for 10-15 minutes to form a uniform dispersion system of nanomaterials in the gypsum matrix. Step 3: Add plaster reinforcing agent, glass fiber, and defoamer and mix them evenly; Step 4: Pour the mixed slurry into the facing paper, press and filter to form, and dry to obtain high-strength flame-retardant gypsum board.

5. The method for manufacturing a high-strength flame-retardant paper-faced gypsum board according to claim 4, characterized in that, The preparation steps for gypsum reinforcing agent (BE-0326 type) are as follows: Step 1: Add the weighed water to the reactor, then heat it to 80-100 degrees Celsius, then add 10-30 parts of starch, and keep it warm to gelatinize for 30-60 minutes; Step 2: Add 0.1-5 parts of the weighed urea to the reaction vessel and continue amination for 30-60 minutes; Step 3: Add 1-15 parts of the weighed PVA powder to the reactor and continue the reaction for 30-60 minutes; Step 4: Cool down to below 50℃, add 0.1-2 parts of the weighed borax to the reaction vessel, and react for 30-60 minutes; Step 5: Add 1-5 parts of HCl and adjust the pH value to neutral to obtain the gypsum reinforcing agent.

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