Generally, the bedroom doors are all wooden doors, especially children's rooms. Why is this? Is there anything to pay attention to? 1. Environmental protection: The environmental protection of the bedroom door is the primary consideration for the purchase of children's doors. Some doors are not environmentally friendly. Containing formic acid and other harmful substances, everyone knows that methanol is a very harmful gas to the human body. It has a great impact on adults, not to mention children. Therefore, it is necessary to choose environmentally friendly wooden doors without paint and formaldehyde. Reinforced wooden doors, splicing wooden doors and other melamine wooden doors, the appearance is simple and stylish, and no other formaldehyde and harmful gases are used. 2. Safety: The safety of the children's bedroom door is the second important factor in the purchase. In order to prevent children from bumping into the door, when selecting the bedroom door, it should be noted that there are few raised decorations and water chestnuts in the facade; the metal door should avoid sharp and sharp, and pay attention to whether the door lock is easy to lock and so on. For families with infants and young children, you can purchase products such as child door lock covers and security door cards to improve safety. 3, sound insulation: adequate and good sleep is very important for the child's Jiankang growth, everyone from children to adulthood, I also believe that many adults still believe that learning is a very difficult thing. Therefore, sound insulation is very important for children, and it can also bring children a good learning environment. The denser the door core, the better the sound insulation effect. 4, privacy: children grow up to a certain age, they need to be relatively independent, do not like to be disturbed, many children will have certain contradictions with their parents, at a certain age, the family will be the shadow of children. They also want to have a space of their own, and do not want to be disturbed by others. Should choose a fully enclosed surface, avoid buying a white bedroom door with a transparent glass window. Closing the door, the children's room is a small world for children, helping children to grow independently. 5, decorative: the choice of bedroom door not only needs to consider the functionality of the door, but also needs a certain aesthetic effect. As children like some beautiful things and beautiful things, they also hope to show their own character and unique places in some places, the matching of the door and the overall space style, especially the choice of the door of the children's room. Therefore, when purchasing, pay attention to avoid choosing the shape of a relatively rigid piece of wood, and choose a wooden door with a more style and more beautiful appearance. [Follow the WeChat public account "Jiuzhengmen Window Network" to view the latest hot article "You are friends who do the doors and windows, everyone has lived!" More industry exchanges, please join the Jiuzhengmen window network exchange group]
15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
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