? 1. The name calcium silicate board has many aliases: decorative gypsum board, gypsum composite board, calcium silicate board, calcium silicate high crystal board, gypsum board and so on. There are also many nicknames for high-crystal board: high-crystal board, high-crystal board, standard high-crystal board, ecological high-crystal board and so on. ?
Second, the history and origin of calcium silicate board 1978 appeared and was successfully developed in Pingjiang, Hunan. The first user who used calcium silicate board as ceiling was Changsha Railway Station. Before the appearance of calcium silicate board, domestic buildings often had no suspended ceiling. Even if ceilings are needed, the materials are pitiful, and wooden ceilings are not many choices. The high crystal board appeared in 1998, which was successfully developed by Wang Zhiwei and Wang Efang in Hunan Province and put into the market. As an upgraded product of calcium silicate board, high-crystal board is welcomed by users for its strength far exceeding that of calcium silicate board and excellent moisture-proof and waterproof performance. ?
Third, raw materials The raw materials that make up the calcium silicate board are mainly building gypsum. The successful development of calcium silicate board in Pingjiang, Hunan Province benefited from gypsum mine in Pingjiang, Hunan Province. Gypsum mine is mined, fried and dehydrated, and becomes a white powdery object. Its scientific name is gypsum hemihydrate, and its chemical molecular formula is caso4. 1/2h2o. Gypsum hemihydrate is mixed with water to form slurry, and needle-like crystals grow alternately, reaching a certain strength in just a few minutes. This slurry is injected into the board mold to obtain the original gypsum board. At this time, gypsum board has low strength and is fragile and easy to crack, so it cannot be used as ceiling material. By adding cement and fiber, the strength of gypsum board is improved. Because gypsum contains calcium and cement contains silicon, it is named calcium silicate board according to these two main raw materials. The main components of high-crystal board are natural gypsum, gypsum modified admixture, silicone waterproof admixture, modified ingredients, glass fiber and so on. Its crystal structure is short column, and waterproof admixture and crystal form a whole waterproof system, so the strength of high-crystal plate is greatly improved and its waterproof and moisture-proof performance is excellent.
? Four. Related technologies This paper abandons the common technologies of mold forming and crystallization maintenance, and only compares the core technologies of the two. The core technology of calcium silicate board is the crystal growth technology of forming needle-like crystals after hydration of gypsum hemihydrate. After gypsum hemihydrate is mixed with water, it can be made into plastic slurry. After a period of reaction, it loses plasticity and condenses into a solid with a certain hardness. In this solid, hydrated crystals form needle clusters, which are interconnected to form a crystal structure network. The core technology of high-crystal board is inorganic crystal transformation technology and integral moisture-proof technology. Inorganic crystal transformation technology refers to controlling crystal growth through additives in the formula during the hydration and coagulation of gypsum hemihydrate: inhibiting the growth of needle-like crystals in the direction of C axis and promoting the growth of crystals in other directions, thus changing the needle-like morphology of crystals and obtaining short columnar crystals with higher strength and firmness. Commonly known as crystal conversion technology. The whole moisture-proof technology is to apply the new waterproof technology of silica gel to the forming process of plates. Through the intervention of silica gel technology, a hydrophobic film is formed around the short columnar crystals in the high-crystal plate to wrap the crystals, prevent water from eroding the crystal connection points, and form a three-dimensional hydrophobic film network inside the material, thus achieving the overall waterproof and moisture-proof effect of the high-crystal plate.
Verb (abbreviation of verb) performance Calcium silicate board has excellent performance when it was first born, and its application in Changsha Railway Station was widely praised, which laid a solid foundation for the rapid sweep of calcium silicate board across the country.
However, with the development of society and the progress of technology, people find that calcium silicate board can't keep up with the development of building materials technology. Mainly manifested in:
1, calcium silicate board is not waterproof. After absorbing moisture and water, the board turns yellow and black in severe cases.
2. The strength of calcium silicate board is not enough. After absorbing moisture, the self-weight increases, and the central part of the board falls like a butterfly. Seriously affected the user's perception; Lowered the grade of the overall decoration. As an upgraded product of calcium silicate board, high crystal board is developed to solve these two problems of calcium silicate board.
Therefore, the performance of high-crystal board is mainly manifested in two aspects:
1, waterproof and moistureproof. High-crystal board should be able to withstand long-term water immersion. Put the high crystal plate into the pool, soak it for 72 hours, and take it out. The strength should not be lost, and there should be no softening and peeling.
2. The strength has been greatly improved. The strength of high crystal plate is several times that of calcium silicate plate. The strength can be detected by pressing a heavy object. The method is as follows: suspend the high-crystal plate, gradually press the heavy objects on it until the high-crystal plate breaks, and then record the total weight when it breaks. A good high crystal board ballast can exceed 15 kg, and the top-grade high crystal board ballast can even reach 30 kg.
? Sixth, the service life of calcium silicate board with high cost performance is about 2 to 3 years, and the price is low and the cost performance is low. The service life of high crystal board is longer than 15 years, and the price is higher. However, due to the long service life, the annual use cost is low and the cost performance is high.
? VII. Auxiliary materials for installation-support keel The calcium silicate plate support keel is relatively thin, and the material is often iron sheet and thin aluminum, and the form is relatively simple, only T-shaped keel and trough keel. The support keel of high-crystal plate generally adopts aluminum alloy keel, which is hard and firm. There are many forms, such as straight keel, groove keel, square groove keel, double-line keel and so on. ? Based on the above seven aspects, calcium silicate board and high-crystal board have their own advantages and disadvantages, which have made great contributions to the national economy and improved people's living and working environment. Calcium silicate board is suitable for some places where grade is not required and budget is not high, and high-crystal board is suitable for some places where taste and quality are emphasized.
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