Third, the application of fluoropgypsum in building materials: In addition to the cement retarder can consume fluoropgypsum, fluoropgypsum applied in building materials is its main consumption direction.
1. Gypsum block
With the rapid development of urbanization in China, high-rise buildings have become the mainstream of urban development, and the lightweight, fireproof and heat-insulated gypsum hollow blocks will become a new type of wall materials, and its market development space is huge. In terms of technical equipment, the industrial production of gypsum hollow block made of fresh fluoropgypsum has been successful. The company has obtained the national invention patent ZL201010578704.7 for the fluoropgypsum hollow block and its preparation method. Fluoropgypsum forms strength within 8~10 minutes after the addition of activator. The molding speed of the product is the same as that of other building gypsum powder, and the physical and mechanical properties such as waterproof, hardness and strength are better. Because it is used directly without calcination, the material cost is low (about 200 yuan/ton of building gypsum powder) compared with other wall materials, its competitive advantage and profit margin are huge. And less investment, quick effect. In particular, the semi-dry gypsum and assembly invented by our company in recent years have been completely successful, which further expands the development space of fluoropast gypsum blocks.
2. Gypsum mold box
Gypsum mold box is produced by mechanized production line, with neat appearance, accurate size, smooth surface, stable volume, heat insulation, heat preservation, fire prevention, high strength, good sound insulation performance, no radioactivity, and has good "breathability", can adjust indoor air humidity and other characteristics.
3. Gypsum fireproof board.
Fresh anhydrous fluoropgypsum crystallizes through the addition of water to the initiator and forms a cementitic material. Its crystalline water (20.9%) and free water are about 8-9%, with a total water content of about 30%. In the fire, free water (8-9%) and 20.9% crystal water are discharged in turn, which turn into semi-aqueous gypsum, soluble anhydrite and insoluble gypsum. Water vapor screen is formed in the interface during the drainage process to reduce the temperature and delay the fire damage. Its fire resistance limit is greater than 3-4 hours. It is the best inorganic and flame retardant material.
Because of the characteristics of the structure of fluoropgypsum cementitious material, it has certain physical and mechanical properties, which can be used as a wall material and a good fireproof material.
4. Prepare plaster plaster and bonded plaster
Fresh anhydrous fluoropgypsum by grinding, adding activator, plasticizer, water retaining agent, binder and other admixtures according to a certain mix ratio forced mixing, that is, a fluoropgypsum based plaster gypsum and bonded gypsum (invention patent ZL201110398888.5). It has strong bonding force, stable volume after hardening, not easy to produce dry shrinkage cracks, drum and other phenomena, can fundamentally overcome the cement mixed mortar and lime mortar and other traditional plastering materials of large dry shrinkage, poor adhesion, cracking, shell and other common diseases, and has the effect of fire prevention, and can adjust the indoor temperature within a certain range, At present, the use of stucco plaster is very common in many industrial developed countries. For example, more than 70% of the plastering material in Germany is stucco plaster, and the UK stucco plaster accounts for 50% of the total gypsum.
In order to facilitate construction operation, the operating time (initial and final setting time) of bonded gypsum and painted gypsum is >20min, <120 min and >60 min <8H, respectively, according to the standard. Because fresh anhydrous fluoride gypsum needs to accelerate hydration through activators, the hydration reaction time of bonded gypsum and painted gypsum is long, and the added excitation dose is less.
