阅读说明：本技术 一种防裂轻质石膏龙骨及其制备方法 (Anti-cracking light gypsum keel and preparation method thereof ) 是由 张启卫 崔俊新 徐虎 杨步雷 徐韦洪 李贵汶 朱国飞 杨永彬 彭步平 安光文 宋 于 2020-05-22 设计创作，主要内容包括：本发明属于建筑材料技术领域,尤其涉及一种防裂轻质石膏龙骨及其制备方法。所述防裂轻质石膏龙骨的制备方法,包括以下过程：(1)将工业副产熟石膏与致孔剂混合均匀,放入盐酸溶液中浸泡,搅拌均匀后,过滤除去盐酸溶液,水洗,烘干,粉碎,制得孔状石膏原料；(2)将孔状石膏原料与改性聚丙烯纤维混合,加入水和分散剂搅拌处理,获得混合浆料1；将混合浆料1与水泥、缓凝剂、减水剂混合均匀,制得料浆；(3)在模具底部铺一层纤维网格布,将料浆注入模具中,然后在铺设好的料浆表面再铺设一层纤维网格布；将铺设好的模具在加热加压处理,成型,出模,自然养护。本发明制得的石膏龙骨,质量轻,防裂性能好；可应用于吊顶龙骨。(The invention belongs to the technical field of building materials, and particularly relates to an anti-cracking light gypsum keel and a preparation method thereof. The preparation method of the anti-cracking light gypsum keel comprises the following steps: (1) uniformly mixing industrial byproduct calcined gypsum and a pore-forming agent, soaking in a hydrochloric acid solution, uniformly stirring, filtering to remove the hydrochloric acid solution, washing with water, drying, and crushing to obtain a porous gypsum raw material; (2) mixing a porous gypsum raw material with modified polypropylene fibers, adding water and a dispersing agent, and stirring to obtain a mixed slurry 1; uniformly mixing the mixed slurry 1 with cement, a retarder and a water reducing agent to prepare slurry; (3) laying a layer of fiber mesh cloth at the bottom of the mold, injecting the slurry into the mold, and then laying a layer of fiber mesh cloth on the surface of the laid slurry; and (4) heating and pressurizing the laid mould, forming, demolding and naturally curing. The gypsum keel prepared by the invention has light weight and good anti-cracking performance; can be applied to the suspended ceiling keel.)

1. The preparation method of the anti-cracking light gypsum keel is characterized by comprising the following steps of:

(1) uniformly mixing industrial byproduct plaster of paris and pore-forming agent, soaking in hydrochloric acid solution for 15-20min, stirring uniformly, filtering to remove hydrochloric acid solution, washing with water, drying at 40-50 ℃, and pulverizing to obtain porous plaster raw material;

(2) mixing a porous gypsum raw material with modified polypropylene fibers, adding water and a dispersing agent, and stirring for 10-15min to obtain a mixed slurry 1; uniformly mixing the mixed slurry 1 with cement, a retarder and a water reducing agent to prepare slurry;

(3) laying a layer of fiber mesh cloth at the bottom of the mold, injecting the slurry into the mold, and then laying a layer of fiber mesh cloth on the surface of the laid slurry; pressurizing the laid mould at 60-70 deg.C for 30-40min, applying 0.3-0.4MPa pressure in the vertical direction of the mould, molding, demolding, and naturally maintaining.

2. The method for preparing an anti-cracking light gypsum keel according to claim 1, wherein in the step (1), the pore-forming agent is chitosan, and the concentration of the hydrochloric acid solution is 60%.

3. The preparation method of the anti-cracking light gypsum keel according to claim 1, wherein in the step (1), the addition amount of the pore-forming agent is 30% of the mass of the calcined gypsum.

4. The preparation method of an anti-cracking light gypsum keel according to claim 1, wherein the modified polypropylene fiber is prepared by: adding polypropylene fiber into 20% ethanol water solution with 2 times of the mass of the polypropylene fiber to prepare a mixture; adding vinyltriethoxysilane with a mass of 0.1-0.12% of polypropylene fiber into the mixture, treating at 60-70 deg.C for 15-20min, taking out, and drying.

5. The preparation method of the anti-cracking light gypsum keel according to claim 1, wherein in the step (2), the slurry is prepared from the following raw materials in parts by weight: 60-70 parts of porous gypsum raw material, 20-30 parts of modified polypropylene fiber, 3-5 parts of dispersing agent, 6-10 parts of cement, 05-1 part of retarder and 1-2 parts of water reducing agent; the water amount is 100-110% of the mass of all raw materials.

6. The method for preparing an anti-cracking light gypsum keel as claimed in claim 1 or 5, wherein the dispersant is sodium dodecyl sulfate; the retarder is one of sodium hexametaphosphate and sodium tripolyphosphate; the water reducing agent is a polycarboxylic acid water reducing agent.

7. A plaster keel obtained by the method of preparation according to any one of claims 1-5.

8. Use of a gypsum grid, made according to the method of any one of claims 1 to 5, in a ceiling grid, wherein the gypsum grid is a square, rectangular, H-shaped grid.

9. The use of claim 8, wherein the gypsum grid is secured to the gypsum board by screws after the surface of the gypsum grid has been coated with an adhesive.

10. Use according to claim 9, the adhesive being a polyacrylic resin adhesive.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to an anti-cracking light gypsum keel and a preparation method thereof.

Background

The industrial by-product gypsum is an industrial by-product which is produced by a chemical reaction in industrial production and contains calcium sulfate as a main component. The industrial byproduct gypsum mainly comprises desulfurized gypsum discharged by a coal-fired power plant; phosphogypsum discharged by fertilizer industry; citric acid gypsum discharged from citric acid plants; titanium gypsum discharged from a titanium dioxide factory; fluorgypsum discharged from hydrogen fluoride plants; and the gypsum powder equipment is used for preparing salt gypsum discharged by salt industry and the like. With the development of the current industry in China, the discharge amount of industrial byproduct gypsum is increased sharply. Most of the industrial byproduct plaster is not utilized, occupies a large amount of land and is piled in the open air, so that the industrial byproduct plaster becomes industrial waste residue which seriously pollutes the environment and can bring serious influence on the sustainable development of industries such as electric power industry, chemical industry and the like. The comprehensive recycling of industrial byproduct gypsum is the key of sustainable development of industries such as electric power industry, chemical industry and the like.

At present, industrial by-product gypsum is widely applied to the field of building materials, such as gypsum boards, gypsum blocks and the like, and has the advantages of light weight, fire resistance, heat preservation and the like. The building keel is a building material for supporting and fixing structures, and is widely applied to places such as hotels, terminal buildings, passenger stations, theaters, markets, factories, office buildings, old building reconstruction, indoor decoration and the like. The keels may be classified into wood keels, light steel keels, aluminum alloy keels, steel keels, etc. according to the difference of the construction materials. Because of the high production cost of keels such as wood keels, light steel keels, aluminum alloy keels, steel keels, and the like, gypsum has been studied as a basic material for keels.

For example, patent publication No. CN2583233Y discloses a plaster keel, which is mainly characterized in that the plaster keel is a square column, the left and right side surfaces and the front and back surfaces are respectively provided with a plastic shell, plaster is filled in the plastic shell, and reinforcing ribs are fixedly embedded in the plastic shell. The high-tensile and anti-bending plastic material for reinforcing the gypsum keel is used for reinforcing the gypsum body in an embedding mode through mechanical engagement, and the gypsum keel can realize mass and automatic production.

The strength of the plaster keel is enhanced by directly adding an additional material to enhance the ribs, and the plaster keel is easy to crack in the application process.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides an anti-cracking light gypsum keel and a preparation method thereof.

The method is realized by the following technical scheme:

the preparation method of the anti-cracking light gypsum keel is characterized by comprising the following steps of:

(1) uniformly mixing industrial byproduct plaster of paris and pore-forming agent, soaking in hydrochloric acid solution for 15-20min, stirring uniformly, filtering to remove hydrochloric acid solution, washing with water, drying at 40-50 ℃, and pulverizing to obtain porous plaster raw material;

(2) mixing a porous gypsum raw material with modified polypropylene fibers, adding water and a dispersing agent, and stirring for 10-15min to obtain a mixed slurry 1; uniformly mixing the mixed slurry 1 with cement, a retarder and a water reducing agent to prepare slurry;

(3) laying a layer of fiber mesh cloth at the bottom of the mold, injecting the slurry into the mold, and then laying a layer of fiber mesh cloth on the surface of the laid slurry; pressurizing the laid mould at 60-70 deg.C for 30-40min, applying 0.3-0.4MPa pressure in the vertical direction of the mould, molding, demolding, and naturally maintaining.

Preferably, in the step (1), the pore-forming agent is chitosan, and the concentration of the hydrochloric acid solution is 60%.

Preferably, in the step (1), the addition amount of the pore-forming agent is 30% of the mass of the plaster stone.

Preferably, the modified polypropylene fiber is prepared by: adding polypropylene fiber into 20% ethanol water solution with 2 times of the mass of the polypropylene fiber to prepare a mixture; adding vinyltriethoxysilane with a mass of 0.1-0.12% of polypropylene fiber into the mixture, treating at 60-70 deg.C for 15-20min, taking out, and drying.

Preferably, in the step (2), the slurry is prepared from the following raw materials in parts by weight: 60-70 parts of porous gypsum raw material, 20-30 parts of modified polypropylene fiber, 3-5 parts of dispersing agent, 6-10 parts of cement, 05-1 part of retarder and 1-2 parts of water reducing agent; the water amount is 100-110% of the mass of all raw materials;

preferably, the dispersant is sodium lauryl sulfate; the retarder is one of sodium hexametaphosphate and sodium tripolyphosphate; the water reducing agent is a polycarboxylic acid water reducing agent.

The invention also provides the anti-cracking light gypsum keel prepared by the preparation method.

The invention also provides an application of the anti-cracking light gypsum keel prepared by the preparation method in a ceiling keel, wherein the gypsum keel is a square tube-shaped, cuboid or H-shaped keel.

Preferably, after the surface of the gypsum keel is coated with a layer of adhesive, the gypsum keel is fixedly connected with the gypsum board by using screws.

Preferably, the adhesive is a polyacrylic resin adhesive.

The industrial byproduct calcined gypsum is one or more of phosphogypsum, desulfurized gypsum, fluorgypsum, citric acid gypsum, salt gypsum, milk gypsum, yellow gypsum and soda gypsum, and is a product obtained by calcining and removing part or all of crystal water; the main chemical component of the fertilizer is CaSO₄·1/2H₂O。

The invention has the beneficial effects that:

according to the invention, the calcined gypsum is treated by adopting the pore-forming agent, the treated calcined gypsum has a porous structure, and when the treated calcined gypsum is mixed with other raw materials such as modified polypropylene fibers and cement to prepare slurry, the other raw materials are promoted to enter the porous structure, so that not only can the strength of the gypsum raw materials be improved, but also the dispersion performance between the other raw materials and the gypsum is greatly improved; the cracking of the gypsum keel caused by uneven dispersion of the raw materials is avoided; meanwhile, the porous gypsum effectively reduces the density of the gypsum keel, so that the weight of the gypsum keel becomes lighter. The modified polypropylene fiber can improve the plasticity of plaster of paris and cement and improve the anti-cracking performance of the gypsum keel. The dispersant can further improve the water resistance of the plaster of paris and promote the fusion between the plaster and the modified polypropylene fiber. The fiber gridding cloth is adopted as the auxiliary material of the gypsum keel, the fiber gridding cloth and the slurry have good wetting performance, and the problem that the gypsum keel is easy to crack in the using process due to high stress caused by poor wetting between the fiber gridding cloth and the slurry is avoided.

The gypsum keel prepared by the invention has light weight and good anti-cracking performance; can be applied to the furred ceiling fossil fragments, adopt polypropylene resin adhesive to handle when using after again with the gypsum board bonding, avoid gypsum fossil fragments and gypsum board junction to lead to the gypsum board to bulge the fracture because of gaseous existence.

Detailed Description

The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.