Mildew-proof gypsum plaster board and preparation method thereof

Abstract

The invention relates to the technical field of gypsum plaster boards, in particular to a mildew-proof gypsum plaster board and a preparation method thereof.The preparation method comprises the following steps that raw materials are evenly and sufficiently mixed to obtain a modified gypsum material, the modified gypsum material is poured into a flat forming machine pressed with surface protection paper, then a layer of surface protection paper is attached to the surface, hot press forming, drying, cutting off and edge sawing are conducted, and the mildew-proof gypsum plaster board is obtained. The mildew-proof gypsum plaster board is obtained. According to the mildew-proof gypsum plaster board disclosed by the invention, the desulfurized gypsum is adopted as a matrix, the mildew-proof agent, the dispersing agent, the water reducing agent and the foaming agent are added as functional aids, and meanwhile, the added continuous additive and the added blending agent are blended, synergized and co-coordinated, so that the mildew-proof, sound-absorbing and fracture loading properties of the obtained gypsum plaster board are harmoniously improved, and the mildew-proof, sound-absorbing and fracture loading properties of the gypsum plaster board are improved. And the product has remarkable corrosion resistance and heat-resistant stability effects.

Description

Technical Field

[0001] 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. 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 use gypsum as the core material and are made 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 prevention, sound absorption, and fracture load, 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: A preparation method of a mildew-proof paper-faced gypsum board includes the following steps: Step 1: Weigh the raw materials according to parts by weight: 55 - 60 parts of desulfurized gypsum, 8 - 13 parts of helian additive, 5 - 7 parts of blending 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; 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, then attach another layer of facing paper on the surface, hot-press to form, dry, cut, and saw the edges to obtain the mildew-proof paper-faced gypsum board; The preparation method of the helian additive is as follows: S1: Preparation of modified helian agent: 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 the modified helian agent; S2: Preparation of helian liquid with blended fibers; 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; Then add 1 - 3 parts of nano-calcium carbonate and 3 - 5 parts of expanded perlite to 5 - 8 parts of the sodium silicate liquid, perform ultrasonic treatment, then filter and dry 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.

[0005] Preferably, 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.

[0006] Preferably, the preparation method of the fiber-admixing 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 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.

[0007] Preferably, the mass fraction of the barium nitrate solution is 5-7%; the mass fraction of the sulfuric acid solution is 6-9%.

[0008] Preferably, the ultrasonic treatment is performed at an ultrasonic power of 450-500W for 1 hour.

[0009] 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%.

[0010] 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%.

[0011] The invention also provides a method for preparing the mildew-proof gypsum board and a mildew-proof gypsum board prepared by the method.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The mildew-proof paper-faced gypsum board of the present invention uses desulfurized gypsum as the matrix, and adds a mildew-proof agent, a dispersant, a water reducer and a foaming agent as functional auxiliaries. At the same time, the added and continuously added agents and the blending agent are harmonized and coordinated together, so that 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; 2. The continuously added agent is made by mixing and ball-milling the filling agent and the fiber-added liquid with blended fibers. The filling agent is ultrasonically improved by nano-calcium carbonate and expanded perlite with sodium silicate solution. The sodium silicate solution with a mass fraction of 6-8% of sodium silicate solution, α-aluminum oxide and silane coupling agent KH550 are blended and coordinated. Through the specific raw materials of α-aluminum oxide, sodium silicate solution and silane coupling agent KH550, and then coordinating nano-calcium carbonate and expanded perlite, the filling agent can be better filled into the fiber-added liquid with blended fibers, and the filling agent and the fiber-added liquid with blended fibers can be better coordinated and synergistic, thereby improving the performance coordination and performance stability effects of the product; 3. The fiber-added liquid with blended fibers is treated by acid solution and preheating activation with silicon carbide fibers, and then ball-milled with a modified added agent. The modified added agent is improved by blending barium nitrate solution, chitosan solution with a mass fraction of 5%, nano-montmorillonite and wood cellulose. Through the lamellar structure of nano-montmorillonite and raw materials such as wood cellulose, and the acicular structure of silicon carbide fibers, the mildew-proof property, sound-absorbing and fracture load properties of the product are strengthened, and the performance stability of the product is improved at the same time; 4. The blending agent is made by blending and improving cerium chloride, sodium citrate solution and titanium oxide, and a cerium-added titanium oxide agent is prepared. Through the cerium-added titanium oxide agent, it can be better coordinated with the modified liquid. The modified liquid is treated by blending boron nitride, lanthanum chloride solution, illite and nano-silica sol. Through the specific raw materials such as boron nitride and illite, the cerium-added titanium oxide agent is coordinated and synergistic. Through the co-ordination improvement of the raw materials, the blending agent and the continuously added agent are co-ordinated and synergistic, and the product performance coordination and performance stability of the obtained mildew-proof paper-faced gypsum board are further improved. Specific embodiments

[0013] The following combines specific embodiments to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0014] A preparation method of a mildew-proof paper-faced gypsum board in this embodiment includes the following steps: Step 1: Weigh the raw materials according to parts by weight: 55 - 60 parts of desulfurized gypsum, 8 - 13 parts of helian additive, 5 - 7 parts of blending 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; Step 2: Mix the above raw materials thoroughly to obtain 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, and perform hot pressing, drying, cutting and edge sawing to obtain the mildew-proof paper-faced gypsum board of the present invention.

[0015] The dispersant in this example is sodium lignosulfonate; the foaming agent is dodecyldimethylamine oxide; the water reducing agent is isopropylnaphthalenesulfonic acid sodium; The mildew-proof agent is chitosan deacetate; The temperature of the hot pressing is 200 - 210 °C and the pressure is 20 - 25 MPa.

[0016] The preparation method of the helian additive in this example is as follows: S1: Preparation of modified additive: Add 2 - 4 parts of chitosan solution with a mass fraction of 5% 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 the modified additive; S2: Preparation of the additive solution with blended fibers; S3: Blend 6 - 8% sodium silicate solution, α-aluminum oxide and silane coupling agent KH550 evenly according to the weight ratio of (4 - 6):(2 - 3):1 to obtain sodium silicate solution; Then add 1 - 3 parts of nano-calcium carbonate and 3 - 5 parts of expanded perlite to 5 - 8 parts of sodium silicate solution for ultrasonic treatment, then filter and dry to obtain the filling agent; S4: Mix the filling agent and the additive solution with blended fibers evenly according to the weight ratio of (5 - 7):3 and perform ball milling treatment. The ball milling speed is 1500 r / min and the ball milling time is 2 h. After the ball milling is completed, filter and dry to obtain the helian additive.

[0017] The preparation method of the additive solution with blended fibers in this example is as follows: 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 55 - 60 °C for 1 h to obtain preheated silicon carbide fibers; S1b: Mix 4 - 7 parts of preheated silicon carbide fibers and 3 - 5 parts of modified additive evenly and perform ball milling treatment. The ball milling speed is 1000 r / min and the ball milling time is 1 h. After the ball milling is completed, obtain the additive solution with blended fibers.

[0018] 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%.

[0019] The ultrasonic treatment in this embodiment has an ultrasonic power of 450-500 W and is carried out for 1 hour.

[0020] The preparation method of the adjusting agent of this embodiment 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.

[0021] 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%.

[0022] 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%.

[0023] The mildew-proof gypsum board prepared by the method for preparing the mildew-proof gypsum board in this embodiment.

[0024] Embodiment 1:

[0025] A method for preparing a mildew-proof gypsum board according to the present embodiment comprises the following steps: Step 1: weigh the raw materials according to weight: 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; 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.

[0026] 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; The mildew inhibitor is chitosan; The temperature of the hot pressing molding is 200° C. and the pressure is 20 MPa.

[0027] The preparation method of the continuous additive of the present embodiment is: S1: Preparation of modified intercalating agent: 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; S2: Preparation of fiber blending liquid; 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; 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; 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.

[0028] The preparation method of the fiber-adjusting liquid of this embodiment 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° C. for 1 h to obtain preheated silicon carbide fiber; S1b: 4 parts of preheated silicon carbide fibers and 3 parts of modified intermixing agents are mixed and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling is completed, an intermixing liquid for the mixed fibers is obtained.

[0029] The mass fraction of the barium nitrate solution in this embodiment is 5%; the mass fraction of the sulfuric acid solution is 6%.

[0030] The ultrasonic treatment in this embodiment has an ultrasonic power of 450 W and is carried out for 1 hour.

[0031] The preparation method of the adjusting agent of this embodiment 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 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; 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.

[0032] 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%.

[0033] The stirring speed of the blending and stirring treatment in this example is 450 r / min, and the stirring lasts for 30 min; the mass fraction of the lanthanum chloride solution is 4%.

[0034] The mildew-proof paper-faced gypsum board prepared by the preparation method of the mildew-proof paper-faced gypsum board in this example.

[0035] Example 2: A preparation method of a mildew-proof paper-faced gypsum board in this example includes the following steps: Step 1, weigh the raw materials according to parts by weight: 60 parts of desulfurized gypsum, 13 parts of helian additive, 7 parts of conditioning agent, 6 parts of mildew-proof agent, 5 parts of dispersant, 3 parts of water reducing agent, 4 parts of foaming agent and 30 parts of water; 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, attach another layer of facing paper on the surface, hot press into shape, dry, cut, and saw the edges to obtain the mildew-proof paper-faced gypsum board of the present invention.

[0036] The dispersant in this example is sodium lignosulfonate; the foaming agent is dodecyldimethylamine oxide; the water reducing agent is isopropylnaphthalenesulfonic acid sodium; The mildew-proof agent is deacetylated chitosan; The temperature of the hot pressing into shape is 210 °C, and the pressure is 25 MPa.

[0037] The preparation method of the helian additive in this example is as follows: S1: Preparation of modified helian additive: Add 4 parts of a 5% chitosan solution by mass 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 helian additive; S2: Preparation of the helian liquid with blended fibers; S3: Blend 8% sodium silicate solution, a-aluminum oxide and silane coupling agent KH550 evenly according to the weight ratio of 6:3:1 to obtain a sodium silicate solution; Then add 3 parts of nano-calcium carbonate and 5 parts of expanded perlite to 8 parts of the sodium silicate solution, perform ultrasonic treatment, then filter and dry to obtain a filling agent; S4: Mix the filling agent and the helian liquid with blended fibers evenly according to the weight ratio of 7:3, perform ball milling treatment, the ball milling speed is 1500 r / min, ball mill for 2 h, after the ball milling is completed, filter and dry to obtain the helian additive.

[0038] The preparation method of the helian liquid with blended fibers in this example is as follows: S1a: Mix silicon carbide fibers evenly in a sufficient amount of sulfuric acid solution, then wash with water, filter and dry, preheat the dried silicon carbide fibers at 60 °C for 1 h to obtain preheated silicon carbide fibers; 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.

[0039] The mass fraction of the barium nitrate solution in this embodiment is 7%; the mass fraction of the sulfuric acid solution is 9%.

[0040] The ultrasonic treatment in this embodiment has an ultrasonic power of 500 W and is carried out for 1 hour.

[0041] The preparation method of the adjusting agent of this embodiment is: S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent; 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; 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.

[0042] 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%.

[0043] 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%.

[0044] The mildew-proof gypsum board prepared by the method for preparing the mildew-proof gypsum board in this embodiment.

[0045] Embodiment 3: A method for preparing a mildew-proof gypsum board according to the present embodiment comprises the following steps: Step 1: weigh the raw materials according to weight: 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; 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.

[0046] 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; The mildew inhibitor is chitosan; The temperature of the hot pressing molding is 205° C. and the pressure is 22.5 MPa.

[0047] The preparation method of the continuous additive of the present embodiment is: S1: Preparation of modified intercalating agent: Add 3 parts of 5% chitosan solution 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 a modified connecting agent; S2: Preparation of fiber blending liquid; S3: 7% by mass sodium silicate solution, α-alumina and silane coupling agent KH550 are uniformly mixed in a weight ratio of 5:2.5:1 to obtain a sodium silicate solution; Then, 2 parts of nano calcium carbonate and 4 parts of expanded pearlite are added to 6.5 parts of sodium silicate solution for ultrasonic treatment, and then filtered and dried to obtain a filling agent; S4: The filler and the fiber-admixing liquid are mixed in a weight ratio of 6:3 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.

[0048] The preparation method of the fiber-adjusting liquid of this embodiment 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 57.5°C for 1 hour to obtain preheated silicon carbide fiber; S1b: 5.5 parts of preheated silicon carbide fiber and 4 parts of modified intermixing agent are mixed and ball-milled at a speed of 1000 r / min for 1 hour. After the ball milling is completed, the intermixing liquid for the mixed fiber is obtained.

[0049] The mass fraction of the barium nitrate solution in this embodiment is 6%; the mass fraction of the sulfuric acid solution is 7.5%.

[0050] The ultrasonic treatment in this embodiment was performed with an ultrasonic power of 475 W and for 1 h.

[0051] The preparation method of the adjusting agent of this embodiment is: S11: fully mixing cerium chloride, sodium citrate solution and titanium oxide, then filtering and drying to obtain a cerium-added titanium oxide agent; 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; 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.

[0052] In this embodiment, the mass ratio of cerium chloride, sodium citrate solution and titanium oxide is 1.5:6:4; the mass fraction of the sodium citrate solution is 6.5%.

[0053] In this embodiment, the stirring speed for the blending and stirring treatment is 470 r / min, and the stirring is carried out for 35 min; the mass fraction of the lanthanum chloride solution is 5.5%.

[0054] The mildew-proof paper-faced gypsum board prepared by the preparation method of the mildew-proof paper-faced gypsum board in this embodiment.

[0055] Comparative Example 1: It is different from Example 3 in that no additive is added and continuously added.

[0056] Comparative Example 2: It is different from Example 3 in that no filling agent is added during the preparation of the additive.

[0057] Comparative Example 3: It is different from Example 3 in that nano-calcium carbonate and expanded perlite are not added during the preparation of the filling agent.

[0058] Comparative Example 4: It is different from Example 3 in that sodium silicate solution is not added during the preparation of the filling agent.

[0059] Comparative Example 5: It is different from Example 3 in that α-aluminum oxide and silane coupling agent KH550 are not added to the sodium silicate solution.

[0060] Comparative Example 6: It is different from Example 3 in that the additive solution with blended fibers is not added during the preparation of the additive.

[0061] Comparative Example 7: It is different from Example 3 in that preheated silicon carbide fibers are not added during the preparation of the additive solution with blended fibers.

[0062] Comparative Example 8: It is different from Example 3 in that the modified additive is not added during the preparation of the additive solution with blended fibers.

[0063] Comparative Example 9: It is different from Example 3 in that no modifier is added.

[0064] Comparative Example 10: It is different from Example 3 in that the titanium oxide agent with added cerium is not added to the modifier.

[0065] Comparative Example 11: It is different from Example 3 in that the modified solution is not added to the modifier.

[0066] Comparative Example 12: Different from Example 3, illite and nano-silica sol were not added to the modification liquid.

[0067] Comparative Example 13: Different from Example 3, boron nitride was not added to the modification liquid, and water was used instead of lanthanum chloride solution.

[0068] 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 the corrosion resistance and heat resistance stability of the products were tested (the products were placed under 5% hydrochloric acid mist conditions for 24 h, and then placed at 70 °C for 24 h. The above was one cycle, and the cycle was repeated 10 times to test the corrosion resistance and heat resistance stability). The performance measurement results are as follows:

[0069] It can be obtained from Examples 1-3 and Comparative Examples 1-13 that The product of Example 3 of the present invention has excellent mildew resistance under conventional conditions, and the sound absorption and breaking load of the product are remarkable. At the same time, the product still has excellent performance stability under corrosion-resistant and heat-resistant conditions; It can be seen from Comparative Examples 1-13 and Example 3 that when the product does not add the helian additive or does not add one of the helian additives, the performance of the product deteriorates significantly. By using the two in coordination and synergistic effect, the performance effect of the product is remarkable; The filling agent was not added to the preparation of the helian additive, nano-calcium carbonate was not added to the preparation of the filling agent, expanded perlite, sodium silicate solution was not added to the preparation of the filling agent, α-aluminum oxide and silane coupling agent KH550 were not added to the sodium silicate solution, the blending liquid with fiber was not added to the preparation of the helian additive, preheated silicon carbide fiber was not added to the preparation of the blending liquid with fiber, and the modified blending agent was not added to the preparation of the blending liquid with fiber; The performance of the products all shows a trend of deterioration to varying degrees. The performance effect of 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 blending liquid with fiber obtained by a specific process is the most obvious. And when the modified blending agent is not added to the preparation of the blending liquid with fiber, the performance of the product also shows a relatively obvious trend of deterioration; The cerium-doped titanium oxide agent was not added to the blending agent, the modification liquid was not added to the blending agent, illite and nano-silica sol were not added to the modification liquid, boron nitride was not added to the modification liquid, and water was used instead of lanthanum chloride solution. The performance effect of the blending agent made of the modification liquid obtained by the specific method of the present invention in combination with the cerium-doped titanium oxide agent is the most remarkable.

[0070] Based on the fact that the modified blending agent has a great influence on the performance of the product, further research is carried out on this: Add 3 parts of a 5% chitosan solution by mass to 4.5 parts of a barium nitrate solution, and then add 2.5 parts of nano-montmorillonite and 4 parts of wood cellulose and stir evenly to obtain a modified additive.

[0071] Experimental Example 1: It is the same as Example 3, except that nano-montmorillonite is not added in the preparation of the modified additive.

[0072] Experimental Example 2: It is the same as Example 3, except that wood cellulose is not added in the preparation of the modified additive.

[0073] Experimental Example 3: It is the same as Example 3, except that barium nitrate solution is not added in the preparation of the modified additive.

[0074] Experimental Example 4: It is the same as Example 3, except that chitosan solution is not added in the preparation of the modified additive.

[0075] The product performance tests of Experimental Examples 1-4 are as follows:

[0076] It can be seen from Experimental Examples 1-4 that when nano-montmorillonite is not added in the preparation of the modified additive, the performance stability of the product deteriorates significantly under corrosion-resistant and heat-resistant conditions. At the same time, when wood cellulose and barium nitrate solution are not added in the preparation of the modified additive, the performance of the product shows a deteriorating trend to varying degrees. And when chitosan solution is not added in the preparation of the modified additive, the mildew time of the product has 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 using other methods to replace it is not as obvious as the effect of the present invention.

[0077] 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 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-limiting. 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 included in the present invention.

[0078] 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; 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 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 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.

4. 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%.

5. 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.

6. 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%.

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

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

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