A mildew-proof paper-faced gypsum board and its preparation method

Abstract

The present invention relates to the technical field of paper-faced gypsum boards, and particularly relates to a mildew-proof paper-faced gypsum board and a preparation method thereof, comprising the following steps: uniformly mixing raw materials to obtain modified gypsum material, pouring the modified gypsum material into a flat forming machine with facing paper pressed thereon, attaching another layer of facing paper on the surface, hot pressing into shape, drying, cutting, and sawing the edges to obtain the mildew-proof paper-faced gypsum board. The mildew-proof paper-faced gypsum board of the present invention uses desulfurized gypsum as the matrix, and by adding a mildew-proof agent, a dispersant, a water reducing agent, and a foaming agent as functional auxiliaries, and at the same time adding a sum additive and a blending agent to coordinate and cooperate with each other, the mildew-proof, sound-absorbing, and fracture load properties of the obtained paper-faced gypsum board are coordinately improved, and the corrosion resistance and heat resistance stability effects of the product are remarkable.

Description

Technical Field

[0001] The present invention relates to the technical field of paper-faced gypsum boards, and particularly to a mildew-proof paper-faced gypsum board and a preparation method thereof. Background Art

[0002] Gypsum boards mainly include: paper-faced gypsum boards, non-paper-faced gypsum boards, decorative gypsum boards, gypsum hollow slabs, fiber gypsum boards, gypsum sound-absorbing boards, positioning point gypsum boards, etc. The existing paper-faced gypsum boards are made of gypsum as the core material and are combined with facing paper. They have poor mildew-proof performance, and at the same time, the sound-absorbing property and fracture load property of the products are poor. It is difficult to achieve coordinated improvement in mildew-proof, sound-absorbing, and fracture load properties of the products, and the corrosion resistance and heat resistance stability of the products are poor, which limits the use efficiency of the products. Summary of the Invention

[0003] Aiming at the defects of the prior art, the purpose of the present invention is to provide a mildew-proof paper-faced gypsum board and a preparation method thereof to solve the problems raised in the above background art.

[0004] The present invention adopts the following technical solutions to solve the technical problems:

[0005] A preparation method of a mildew-proof paper-faced gypsum board includes the following steps:

[0006] Step 1: Weigh the raw materials according to parts by weight:

[0007] 55 - 60 parts of desulfurized gypsum, 8 - 13 parts of helian additive, 5 - 7 parts of conditioning agent, 4 - 6 parts of mildew-proof agent, 3 - 5 parts of dispersant, 1 - 3 parts of water-reducing agent, 2 - 4 parts of foaming agent, and 20 - 30 parts of water;

[0008] Step 2: Mix the above raw materials evenly to obtain a modified gypsum material. Pour the modified gypsum material into a flat forming machine with facing paper pressed on it, then attach another layer of facing paper on the surface, hot-press and form, dry, cut, and saw the edges to obtain a mildew-proof paper-faced gypsum board;

[0009] The preparation method of the helian additive is as follows:

[0010] S1: Preparation of modified tianlian agent:

[0011] Add 2 - 4 parts of a 5% chitosan solution to 3 - 6 parts of barium nitrate solution, then add 2 - 3 parts of nano-montmorillonite and 3 - 5 parts of wood cellulose and stir evenly to obtain a modified tianlian agent;

[0012] S2: Preparation of the tianlian liquid with added fiber;

[0013] S3: Mix a sodium silicate solution with a mass fraction of 6 - 8%, α-aluminum oxide, and silane coupling agent KH550 evenly according to a weight ratio of (4 - 6):(2 - 3):1 to obtain a sodium silicate liquid;

[0014] Then, 1-3 parts of nano calcium carbonate and 3-5 parts of expanded pearlite are added to 5-8 parts of sodium silicate solution for ultrasonic treatment, and then filtered and dried to obtain a filling agent;

[0015] S4: Mix the filler and the fiber-doped liquid in a weight ratio of (5-7):3 and ball-mill them at a speed of 1500 r / min for 2 h. After the ball milling is completed, filter and dry to obtain the connecting agent;

[0016] The preparation method of the adjusting agent is:

[0017] S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent;

[0018] 2-4 parts of boron nitride, 3-5 parts of lanthanum chloride solution, 1-3 parts of illite and 1-2 parts of nano-silica sol are mixed and stirred to obtain a modified solution;

[0019] S12: The cerium-added titanium oxide agent and the modified liquid are mixed and ball-milled in a weight ratio of (5-7):3 at a ball-milling speed of 1000-1200 r / min for 2 hours. After the ball-milling is completed, the mixture is filtered and dried to obtain the adjusting agent.

[0020] Preferably, the dispersant is sodium lignin sulfonate; the foaming agent is dodecyl dimethyl amine oxide; the water reducing agent is sodium isopropyl naphthalene sulfonate;

[0021] The mildew inhibitor is chitosan;

[0022] The temperature of the hot pressing molding is 200-210° C. and the pressure is 20-25 MPa.

[0023] Preferably, the preparation method of the fiber-admixing liquid is as follows:

[0024] S1a: mixing the silicon carbide fiber in a sufficient amount of sulfuric acid solution, then washing, filtering and drying, and preheating the dried silicon carbide fiber at 55-60° C. for 1 h to obtain preheated silicon carbide fiber;

[0025] S1b: 4-7 parts of preheated silicon carbide fibers and 3-5 parts of modified connecting agent are mixed and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling is completed, a connecting liquid for mixing the fibers is obtained.

[0026] Preferably, the mass fraction of the barium nitrate solution is 5-7%; the mass fraction of the sulfuric acid solution is 6-9%.

[0027] Preferably, the ultrasonic treatment is performed at an ultrasonic power of 450-500W for 1 hour.

[0028] Preferably, the mass ratio of the cerium chloride, sodium citrate solution and titanium oxide is (1-2):(5-7):4; wherein the mass fraction of the sodium citrate solution is 5-8%.

[0029] Preferably, the stirring speed of the blending and stirring treatment is 450-500 r / min, and the stirring is 30-40 min; and the mass fraction of the lanthanum chloride solution is 4-7%.

[0030] The invention also provides a method for preparing the mildew-proof gypsum board and a mildew-proof gypsum board prepared by the method.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The mildew-proof gypsum board of the present invention adopts desulfurized gypsum as a matrix, and mildew-proof agent, dispersant, water-reducing agent and foaming agent are added as functional additives, and the continuous additive and the adjusting agent are added at the same time to coordinate and synergize, so that the mildew-proof, sound-absorbing and breaking load properties of the obtained gypsum board are coordinated and improved, and the corrosion resistance and heat resistance stability of the product are remarkable;

[0033] 2. The connecting agent is made by mixing and ball milling the filling agent and the fiber-doped connecting liquid. The filling agent is improved by ultrasonic treatment of sodium silicate liquid with nano calcium carbonate and expanded perlite. The sodium silicate solution with a mass fraction of 6-8%, a-alumina and silane coupling agent KH550 in the sodium silicate liquid are coordinated. The a-alumina is blended with the sodium silicate solution and the silane coupling agent KH550 specific raw materials, and then nano calcium carbonate and expanded perlite are coordinated, so that the filling agent can be better supplemented and filled into the fiber-doped connecting liquid, and the filling agent and the fiber-doped connecting liquid are better coordinated and synergized, thereby improving the performance coordination and performance stability of the product;

[0034] 3. The fiber-adjusting liquid uses silicon carbide fiber, which is treated with acid solution and preheated activation, and then ball-milled with a modified connecting agent. The barium nitrate solution in the modified connecting agent, a 5% chitosan solution, and nano-montmorillonite and wood cellulose are blended and improved. The lamellar structure of nano-montmorillonite is combined with wood cellulose and other raw materials, and the needle-like structure of silicon carbide fiber is used to strengthen the mildew resistance, sound absorption and breaking load of the product, while improving the performance stability of the product.

[0035] 4. The adjusting agent is improved by mixing and blending cerium chloride, sodium citrate solution and titanium oxide to prepare cerium-added titanium oxide agent. The cerium-added titanium oxide agent can be better coordinated with the modifying liquid. The boron nitride, lanthanum chloride solution and illite as well as nano-silica sol in the modifying liquid are mixed and stirred. The cerium-added titanium oxide agent is coordinated by blending and blending specific raw materials such as boron nitride and illite. Through the improvement of the co-blending between the raw materials, the adjusting agent and the continuous adding agent are used to coordinate the product performance coordination and performance stability of the obtained mildew-proof paper-faced gypsum board. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] A method for preparing a mildew-proof gypsum board according to the present embodiment comprises the following steps:

[0038] Step 1: weigh the raw materials according to weight:

[0039] 55-60 parts of desulfurized gypsum, 8-13 parts of continuous additive, 5-7 parts of adjusting agent, 4-6 parts of mildew inhibitor, 3-5 parts of dispersant, 1-3 parts of water reducer, 2-4 parts of foaming agent and 20-30 parts of water;

[0040] Step 2, the above raw materials are mixed well to obtain modified gypsum material, the modified gypsum material is poured into a flat plate forming machine with a face paper pressed thereon, a layer of face paper is attached to the surface, hot pressing is performed, drying, cutting, and sawing are performed to obtain the mildew-proof paper-faced gypsum board of the present invention.

[0041] The dispersant in this embodiment is sodium lignin sulfonate; the foaming agent is dodecyl dimethyl amine oxide; the water reducing agent is sodium isopropyl naphthalene sulfonate;

[0042] The mildew inhibitor is chitosan;

[0043] The temperature of the hot pressing molding is 200-210° C. and the pressure is 20-25 MPa.

[0044] The preparation method of the continuous additive of the present embodiment is:

[0045] S1: Preparation of modified intercalating agent:

[0046] Add 2-4 parts of 5% chitosan solution to 3-6 parts of barium nitrate solution, then add 2-3 parts of nano-montmorillonite and 3-5 parts of wood cellulose and stir evenly to obtain a modified connecting agent;

[0047] S2: Preparation of fiber blending liquid;

[0048] S3: 6-8% by mass sodium silicate solution, a-alumina and silane coupling agent KH550 are uniformly mixed in a weight ratio of (4-6): (2-3): 1 to obtain a sodium silicate solution;

[0049] Then, 1-3 parts of nano calcium carbonate and 3-5 parts of expanded pearlite are added to 5-8 parts of sodium silicate solution for ultrasonic treatment, and then filtered and dried to obtain a filling agent;

[0050] S4: Mix the filler and the fiber-doped liquid in a weight ratio of (5-7):3 and ball-mill them at a speed of 1500r / min for 2h. After the ball-milling is completed, filter and dry to obtain the connecting agent.

[0051] The preparation method of the fiber-adjusting liquid of this embodiment is as follows:

[0052] S1a: mixing the silicon carbide fiber in a sufficient amount of sulfuric acid solution, then washing, filtering and drying, and preheating the dried silicon carbide fiber at 55-60° C. for 1 h to obtain preheated silicon carbide fiber;

[0053] S1b: 4-7 parts of preheated silicon carbide fibers and 3-5 parts of modified connecting agent are mixed and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling is completed, a connecting liquid for mixing the fibers is obtained.

[0054] The mass fraction of the barium nitrate solution in this embodiment is 5-7%; the mass fraction of the sulfuric acid solution is 6-9%.

[0055] The ultrasonic treatment in this embodiment has an ultrasonic power of 450-500 W and is carried out for 1 hour.

[0056] The preparation method of the adjusting agent of this embodiment is:

[0057] S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent;

[0058] 2-4 parts of boron nitride, 3-5 parts of lanthanum chloride solution, 1-3 parts of illite and 1-2 parts of nano-silica sol are mixed and stirred to obtain a modified solution;

[0059] S12: The cerium-added titanium oxide agent and the modified liquid are mixed and ball-milled in a weight ratio of (5-7):3 at a ball-milling speed of 1000-1200 r / min for 2 hours. After the ball-milling is completed, the mixture is filtered and dried to obtain the adjusting agent.

[0060] In this embodiment, the mass ratio of cerium chloride, sodium citrate solution and titanium oxide is (1-2): (5-7): 4; wherein the mass fraction of sodium citrate solution is 5-8%.

[0061] The stirring speed of the blending and stirring process in this embodiment is 450-500r / min, and the stirring is 30-40min; the mass fraction of the lanthanum chloride solution is 4-7%.

[0062] The mildew-proof gypsum board prepared by the method for preparing the mildew-proof gypsum board in this embodiment.

[0063] Embodiment 1:

[0064] A method for preparing a mildew-proof gypsum board according to the present embodiment comprises the following steps:

[0065] Step 1: weigh the raw materials according to weight:

[0066] 55 parts of desulfurized gypsum, 8 parts of continuous additive, 5 parts of adjusting agent, 4 parts of mildew inhibitor, 3 parts of dispersant, 1 part of water reducing agent, 2 parts of foaming agent and 20 parts of water;

[0067] Step 2, the above raw materials are mixed well to obtain modified gypsum material, the modified gypsum material is poured into a flat plate forming machine with a face paper pressed thereon, a layer of face paper is attached to the surface, hot pressing is performed, drying, cutting, and sawing are performed to obtain the mildew-proof paper-faced gypsum board of the present invention.

[0068] The dispersant in this embodiment is sodium lignin sulfonate; the foaming agent is dodecyl dimethyl amine oxide; the water reducing agent is sodium isopropyl naphthalene sulfonate;

[0069] The mildew inhibitor is chitosan;

[0070] The temperature of the hot pressing molding is 200° C. and the pressure is 20 MPa.

[0071] The preparation method of the continuous additive of the present embodiment is:

[0072] S1: Preparation of modified intercalating agent:

[0073] Add 2 parts of 5% chitosan solution to 3 parts of barium nitrate solution, then add 2 parts of nano-montmorillonite and 3 parts of wood cellulose and stir evenly to obtain a modified connecting agent;

[0074] S2: Preparation of fiber blending liquid;

[0075] S3: 6-8% by mass sodium silicate solution, a-alumina and silane coupling agent KH550 are uniformly mixed in a weight ratio of 4:2:1 to obtain a sodium silicate solution;

[0076] Then, 1 part of nano calcium carbonate and 3 parts of expanded pearlite are added to 5 parts of sodium silicate solution for ultrasonic treatment, and then filtered and dried to obtain a filling agent;

[0077] S4: Mix the filler and the fiber-doped liquid in a weight ratio of 5:3 and ball-mill them at a speed of 1500 r / min for 2 h. After the ball milling is completed, filter and dry to obtain the connecting agent.

[0078] The preparation method of the fiber-adjusting liquid of this embodiment is as follows:

[0079] S1a: mixing the silicon carbide fiber in a sufficient amount of sulfuric acid solution, then washing, filtering and drying, and preheating the dried silicon carbide fiber at 55° C. for 1 h to obtain preheated silicon carbide fiber;

[0080] S1b: 4 parts of preheated silicon carbide fibers and 3 parts of modified intermediary agents are mixed and ball-milled at a speed of 1000 r / min for 1 h. After the ball milling is completed, an intermediary liquid for intermixing the fibers is obtained.

[0081] The mass fraction of the barium nitrate solution in this embodiment is 5%; the mass fraction of the sulfuric acid solution is 6%.

[0082] The ultrasonic treatment in this embodiment has an ultrasonic power of 450 W and is carried out for 1 hour.

[0083] The preparation method of the adjusting agent of this embodiment is:

[0084] S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent;

[0085] 2 parts of boron nitride, 3 parts of lanthanum chloride solution, 1 part of illite and 1 part of nano-silica sol are mixed and stirred to obtain a modified solution;

[0086] S12: The cerium-added titanium oxide agent and the modified liquid are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain a transfer agent.

[0087] In this embodiment, the mass ratio of cerium chloride, sodium citrate solution and titanium oxide is 1:5:4, wherein the mass fraction of sodium citrate solution is 5%.

[0088] The stirring speed of the blending and stirring process in this embodiment is 450r / min, and the stirring is 30min; the mass fraction of the lanthanum chloride solution is 4%.

[0089] The mildew-proof gypsum board prepared by the method for preparing the mildew-proof gypsum board in this embodiment.

[0090] Embodiment 2:

[0091] A method for preparing a mildew-proof gypsum board according to the present embodiment comprises the following steps:

[0092] Step 1: weigh the raw materials according to weight:

[0093] 60 parts of desulfurized gypsum, 13 parts of continuous additive, 7 parts of adjusting agent, 6 parts of mildew inhibitor, 5 parts of dispersant, 3 parts of water reducer, 4 parts of foaming agent and 30 parts of water;

[0094] Step 2, the above raw materials are mixed well to obtain modified gypsum material, the modified gypsum material is poured into a flat plate forming machine with a face paper pressed thereon, a layer of face paper is attached to the surface, hot pressing is performed, drying, cutting, and sawing are performed to obtain the mildew-proof paper-faced gypsum board of the present invention.

[0095] The dispersant in this embodiment is sodium lignin sulfonate; the foaming agent is dodecyl dimethyl amine oxide; the water reducing agent is sodium isopropyl naphthalene sulfonate;

[0096] The mildew inhibitor is chitosan;

[0097] The temperature of the hot pressing molding is 210° C. and the pressure is 25 MPa.

[0098] The preparation method of the continuous additive of the present embodiment is:

[0099] S1: Preparation of modified intercalating agent:

[0100] Add 4 parts of 5% chitosan solution to 6 parts of barium nitrate solution, then add 3 parts of nano-montmorillonite and 5 parts of wood cellulose and stir evenly to obtain a modified connecting agent;

[0101] S2: Preparation of fiber blending liquid;

[0102] S3: 8% by mass sodium silicate solution, α-alumina and silane coupling agent KH550 are uniformly mixed in a weight ratio of 6:3:1 to obtain a sodium silicate solution;

[0103] Then, 3 parts of nano calcium carbonate and 5 parts of expanded pearlite are added to 8 parts of sodium silicate solution for ultrasonic treatment, and then filtered and dried to obtain a filling agent;

[0104] S4: The filler and the fiber-admixing liquid are mixed in a weight ratio of 7:3 and ball-milled at a speed of 1500 r / min for 2 h. After the ball milling is completed, the mixture is filtered and dried to obtain the connecting agent.

[0105] The preparation method of the fiber-adjusting liquid of this embodiment is as follows:

[0106] S1a: mixing the silicon carbide fiber in a sufficient amount of sulfuric acid solution, then washing, filtering and drying, and preheating the dried silicon carbide fiber at 60° C. for 1 h to obtain preheated silicon carbide fiber;

[0107] S1b: 7 parts of preheated silicon carbide fibers and 5 parts of modified intermediary agents are mixed and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling is completed, an intermediary liquid for doping the fibers is obtained.

[0108] The mass fraction of the barium nitrate solution in this embodiment is 7%; the mass fraction of the sulfuric acid solution is 9%.

[0109] The ultrasonic treatment in this embodiment has an ultrasonic power of 500 W and is carried out for 1 hour.

[0110] The preparation method of the adjusting agent of this embodiment is:

[0111] S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent;

[0112] 4 parts of boron nitride, 5 parts of lanthanum chloride solution, 3 parts of illite and 2 parts of nano-silica sol are mixed and stirred to obtain a modified solution;

[0113] S12: The cerium-added titanium oxide agent and the modified liquid are mixed in a weight ratio of 7:3 and ball-milled at a ball-milling speed of 1200 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain a transfer agent.

[0114] In this embodiment, the mass ratio of cerium chloride, sodium citrate solution and titanium oxide is 2:7:4, wherein the mass fraction of sodium citrate solution is 8%.

[0115] The stirring speed of the blending and stirring process in this embodiment is 500r / min, and the stirring is 40min; the mass fraction of the lanthanum chloride solution is 7%.

[0116] The mildew-proof gypsum board prepared by the method for preparing the mildew-proof gypsum board in this embodiment.

[0117] Embodiment 3:

[0118] A method for preparing a mildew-proof gypsum board according to the present embodiment comprises the following steps:

[0119] Step 1: weigh the raw materials according to weight:

[0120] 57.5 parts of desulfurized gypsum, 11 parts of continuous additive, 6 parts of adjusting agent, 5 parts of mildew inhibitor, 4 parts of dispersant, 2 parts of water reducer, 3 parts of foaming agent and 25 parts of water;

[0121] Step 2: Mix the above raw materials thoroughly to obtain the modified gypsum material. Pour the modified gypsum material into a flat forming machine with facing paper pressed on it, then attach another layer of facing paper on the surface, perform hot pressing to form, dry, cut, and saw the edges to obtain the mildew-proof paper-faced gypsum board of the present invention.

[0122] The dispersant in this example is sodium lignosulfonate; the foaming agent is dodecyldimethylamine oxide; the water reducing agent is isopropylnaphthalenesulfonic acid sodium;

[0123] The mildew-proof agent is deacetylated chitin;

[0124] The temperature of the hot pressing to form is 205°C, and the pressure is 22.5 MPa.

[0125] The preparation method of the additive in this example is as follows:

[0126] S1: Preparation of the modified additive:

[0127] Add 3 parts of a 5% chitosan solution by mass to 4.5 parts of barium nitrate solution, then add 2.5 parts of nano-montmorillonite and 4 parts of wood cellulose and stir evenly to obtain the modified additive;

[0128] S2: Preparation of the additive liquid with blended fibers;

[0129] S3: Blend 5 parts by weight of a 7% sodium silicate solution, α-aluminum oxide, and silane coupling agent KH550 evenly to obtain a sodium silicate solution;

[0130] Then add 2 parts of nano-calcium carbonate and 4 parts of expanded perlite to 6.5 parts of the sodium silicate solution, perform ultrasonic treatment, then filter and dry to obtain the filling agent;

[0131] S4: Mix the filling agent and the additive liquid with blended fibers according to a weight ratio of 6:3, perform ball milling treatment at a ball milling speed of 1500 r / min for 2 h. After the ball milling is completed, filter and dry to obtain the additive.

[0132] The preparation method of the additive liquid with blended fibers in this example is as follows:

[0133] S1a: Mix silicon carbide fibers thoroughly in a sufficient amount of sulfuric acid solution, then wash with water, filter, and dry. Preheat the dried silicon carbide fibers at 57.5°C for 1 h to obtain preheated silicon carbide fibers;

[0134] S1b: Mix 5.5 parts of preheated silicon carbide fibers and 4 parts of the modified additive, perform ball milling treatment at a ball milling speed of 1000 r / min for 1 h. After the ball milling is completed, obtain the additive liquid with blended fibers.

[0135] The mass fraction of the barium nitrate solution in this example is 6%; the mass fraction of the sulfuric acid solution is 7.5%.

[0136] The ultrasonic treatment in this embodiment was performed with an ultrasonic power of 475 W and for 1 h.

[0137] The preparation method of the adjusting agent of this embodiment is:

[0138] S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent;

[0139] 3 parts of boron nitride, 4 parts of lanthanum chloride solution, 2 parts of illite and 1.5 parts of nano-silica sol are mixed and stirred to obtain a modified solution;

[0140] S12: The cerium-added titanium oxide agent and the modified liquid are mixed and ball-milled in a weight ratio of 6:3 at a ball-milling speed of 1100 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain a transfer agent.

[0141] In this embodiment, the mass ratio of cerium chloride, sodium citrate solution and titanium oxide is 1.5:6:4; the mass fraction of sodium citrate solution is 6.5%.

[0142] The stirring speed of the blending and stirring process in this embodiment is 470r / min, and the stirring is 35min; the mass fraction of the lanthanum chloride solution is 5.5%.

[0143] The mildew-proof gypsum board prepared by the method for preparing the mildew-proof gypsum board in this embodiment.

[0144] Comparative Example 1:

[0145] The difference from Example 3 is that no additives were added.

[0146] Comparative Example 2:

[0147] The difference from Example 3 is that no filling agent is added in the preparation of the continuous additive.

[0148] Comparative Example 3:

[0149] The difference from Example 3 is that no nano calcium carbonate or expanded perlite is added in the preparation of the filling agent.

[0150] Comparative Example 4:

[0151] The difference from Example 3 is that no sodium silicate solution is added in the preparation of the filling agent.

[0152] Comparative Example 5:

[0153] The difference from Example 3 is that α-alumina and silane coupling agent KH550 are not added to the sodium silicate solution.

[0154] Comparative Example 6:

[0155] Different from Example 3, the blending liquid for preparing the additive is the one without adding blended fibers.

[0156] Comparative Example 7:

[0157] Different from Example 3, the preheated silicon carbide fibers are not added in the preparation of the blending liquid for blended fibers.

[0158] Comparative Example 8:

[0159] Different from Example 3, the modified blending agent is not added in the preparation of the blending liquid for blended fibers.

[0160] Comparative Example 9:

[0161] Different from Example 3, the blending agent is not added.

[0162] Comparative Example 10:

[0163] Different from Example 3, the cerium-added titanium oxide agent is not added in the blending agent.

[0164] Comparative Example 11:

[0165] Different from Example 3, the modified liquid is not added in the blending agent.

[0166] Comparative Example 12:

[0167] Different from Example 3, illite and nano-silica sol are not added in the modified liquid.

[0168] Comparative Example 13:

[0169] Different from Example 3, boron nitride is not added in the modified liquid, and the lanthanum chloride solution is replaced by water.

[0170] The products of Examples 1 - 3 and Comparative Examples 1 - 13 were tested for mildew resistance (observing the mildew time of the products under the conditions of 30 °C and 90% relative humidity), sound absorption and breaking load, and tested for corrosion resistance and heat resistance stability of the products (placing the products under 5% hydrochloric acid mist conditions for 24 h, and then placing them at 70 °C for 24 h. The above is one cycle, and the cycle is repeated 10 times to test the corrosion resistance and heat resistance stability). The performance measurement results are as follows:

[0171]

[0172] It can be obtained from Examples 1 - 3 and Comparative Examples 1 - 13 that

[0173] The product of Example 3 of the present invention has excellent mildew resistance under conventional conditions, and the effects of sound absorption and breaking load of the product are remarkable. At the same time, the product still has excellent performance stability under corrosion resistance and heat resistance conditions;

[0174] It can be seen from Comparative Examples 1-13 and Example 3 that when no addition agent or only one of the addition agents is added to the product, the performance of the product deteriorates significantly. When the two are used in coordination, the performance effect of the product is significant;

[0175] No filling agent is added in the preparation of the addition agent, no nano-calcium carbonate is added in the preparation of the filling agent, no expanded perlite is added in the preparation of the filling agent, no sodium silicate solution is added in the preparation of the filling agent, no α-aluminum oxide and silane coupling agent KH550 are added in the sodium silicate solution, no addition liquid with blended fibers is added in the preparation of the addition agent, no preheated silicon carbide fibers are added in the preparation of the addition liquid with blended fibers, and no modified addition agent is added in the preparation of the addition liquid with blended fibers;

[0176] The performance of the product shows a deteriorating trend to varying degrees. The performance effect of the product is the most obvious when using the filling agent made of the sodium silicate solution of the present invention in combination with specific raw materials such as nano-calcium carbonate and expanded perlite and the addition liquid with blended fibers obtained by a specific process. Also, when no modified addition agent is added in the preparation of the addition liquid with blended fibers, the performance of the product also shows a relatively obvious deteriorating trend;

[0177] No cerium-doped titanium oxide agent is added to the blending agent, no modified liquid is added to the blending agent, no illite, nano-silica sol, and boron nitride are added to the modified liquid, and water is used instead of the lanthanum chloride solution. The performance effect of the product is the most significant when using the modified liquid obtained by the specific method of the present invention in combination with the cerium-doped titanium oxide agent to make the blending agent.

[0178] Since the modified addition agent has a great influence on the performance of the product, further research is carried out on this:

[0179] 3 parts of a 5% chitosan solution by mass are added to 4.5 parts of barium nitrate solution, and then 2.5 parts of nano-montmorillonite and 4 parts of wood cellulose are added and stirred evenly to obtain the modified addition agent.

[0180] Experimental Example 1:

[0181] The same as Example 3, except that nano-montmorillonite is not added in the preparation of the modified addition agent.

[0182] Experimental Example 2:

[0183] The same as Example 3, except that wood cellulose is not added in the preparation of the modified addition agent.

[0184] Experimental Example 3:

[0185] The same as Example 3, except that barium nitrate solution is not added in the preparation of the modified addition agent.

[0186] Experimental Example 4:

[0187] Same as Example 3, except that no chitosan solution was added in the preparation of the modified additive.

[0188] The product performance tests of Experimental Examples 1-4 are as follows:

[0189]

[0190] It can be seen from Experimental Examples 1-4 that when no nano-montmorillonite was added in the preparation of the modified additive, the performance stability of the product deteriorated significantly under corrosion-resistant and heat-resistant conditions. At the same time, when no lignocellulose and no barium nitrate solution were added in the preparation of the modified additive, the performance of the product showed a deteriorating trend to varying degrees. In addition, when no chitosan solution was added in the preparation of the modified additive, the mildew time of the product had an improving trend. The performance effect of the product prepared with the specific raw material formula of the present invention is the most significant, and the effects of using other methods to replace it are not as obvious as that of the present invention.

[0191] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0192] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a mildew-proof gypsum board, characterized in that: The following steps are involved: Step 1: weigh the raw materials according to weight: 55-60 parts of desulfurized gypsum, 8-13 parts of continuous additive, 5-7 parts of adjusting agent, 4-6 parts of mildew inhibitor, 3-5 parts of dispersant, 1-3 parts of water reducer, 2-4 parts of foaming agent and 20-30 parts of water; Step 2, the above raw materials are mixed to obtain a modified gypsum material, the modified gypsum material is poured into a flat plate forming machine with a face paper pressed thereon, a layer of face paper is attached to the surface, hot-pressed, dried, cut, and sawed to obtain a mildew-proof paper-faced gypsum board; The preparation method of the continuous additive is as follows: S1: Preparation of modified intercalating agent: Add 2-4 parts of 5% chitosan solution to 3-6 parts of barium nitrate solution, then add 2-3 parts of nano-montmorillonite and 3-5 parts of wood cellulose and stir evenly to obtain a modified connecting agent; S2: Preparation of fiber blending liquid; The preparation method of the fiber-adjusting liquid is as follows: S1a: mixing the silicon carbide fiber in a sufficient amount of sulfuric acid solution, then washing, filtering and drying, and preheating the dried silicon carbide fiber at 55-60° C. for 1 h to obtain preheated silicon carbide fiber; S1b: 4-7 parts of preheated silicon carbide fiber and 3-5 parts of modified connecting agent are mixed and ball-milled at a speed of 1000 r / min for 1 hour to obtain a connecting liquid for mixing and adjusting the fiber; S3: 6-8% by mass sodium silicate solution, a-alumina and silane coupling agent KH550 are uniformly mixed in a weight ratio of (4-6): (2-3): 1 to obtain a sodium silicate solution; Then, 1-3 parts of nano calcium carbonate and 3-5 parts of expanded pearlite are added to 5-8 parts of sodium silicate solution for ultrasonic treatment, and then filtered and dried to obtain a filling agent; S4: Mix the filler and the fiber-doped liquid in a weight ratio of (5-7):3 and ball-mill them at a speed of 1500 r / min for 2 h. After the ball-milling is completed, filter and dry to obtain the connecting agent; The preparation method of the adjusting agent is: S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent; 2-4 parts of boron nitride, 3-5 parts of lanthanum chloride solution, 1-3 parts of illite and 1-2 parts of nano-silica sol are mixed and stirred to obtain a modified solution; S12: The cerium-added titanium oxide agent and the modified liquid are mixed and ball-milled in a weight ratio of (5-7):3 at a ball-milling speed of 1000-1200 r / min for 2 hours. After the ball-milling is completed, the mixture is filtered and dried to obtain the adjusting agent.

2. The method for preparing a mildew-proof gypsum board according to claim 1, characterized in that: The dispersant is sodium lignin sulfonate; the foaming agent is dodecyl dimethyl amine oxide; the water reducing agent is sodium isopropyl naphthalene sulfonate; The mildew inhibitor is chitosan; The temperature of the hot pressing molding is 200-210° C. and the pressure is 20-25 MPa.

3. The method for preparing a mildew-proof gypsum board according to claim 1, characterized in that: The mass fraction of the barium nitrate solution is 5-7%; the mass fraction of the sulfuric acid solution is 6-9%.

4. The method for preparing a mildew-proof gypsum board according to claim 1, characterized in that: The ultrasonic treatment was performed at an ultrasonic power of 450-500 W for 1 hour.

5. The method for preparing a mildew-proof gypsum board according to claim 1, characterized in that: The mass ratio of the cerium chloride, sodium citrate solution and titanium oxide is (1-2): (5-7): 4; wherein the mass fraction of the sodium citrate solution is 5-8%.

6. The method for preparing a mildew-proof gypsum board according to claim 1, characterized in that: The stirring speed of the blending and stirring treatment is 450-500 r / min, and the stirring is 30-40 min; the mass fraction of the lanthanum chloride solution is 4-7%.

7. A mildew-proof gypsum board prepared by the method for preparing a mildew-proof gypsum board according to any one of claims 1 to 6.

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