Plasticine is the predecessor of colored clay. Since 1956 came out, plasticine has become children's favorite toy. At first, plasticine was only gray, but in the following years, plasticine had various colors and smells. Including luminous, gold, silver, shampoo, shaving water and so on. Plasticine is a unique game. Plasticine is simple and convenient to make by hand. In production, the simultaneous operation of left and right hands can also adjust thinking and balance the intellectual development of left and right brains.
Today, the material and technology of plasticine have changed a lot. Unlike before, plasticine can't be mixed and reused, and it is rough and hard. The upgraded plasticine is called "colored clay", the high-end plasticine is called "ultra-light clay", and the representative one is "Okey clay". Plasticine can be divided into industrial plasticine and ordinary plasticine for children to play with. Plaster is used as a learning tool for children. For example, in the teaching process of learning pinyin, let children pinch letters with plasticine.
Using this method to learn children, not only learned to make by hand, but also learned the contents of textbooks. It really kills two birds with one stone, which embodies the teaching philosophy of "entertaining education" and "entertaining education".
Gypsum characteristics:
Industrial plasticine is a kind of mud similar to plasticine used in industry, which has a wide range of uses. Features: Advanced colored clay is nontoxic and environmentally friendly. Mainly used in handicrafts, hardware, plastic mold opening and student sculpture. Can be recycled and will not deteriorate for a long time. The new plasticine is mainly made of calcium carbonate, liquid paraffin and glycerol. For children, teenagers and related personnel to practice making ceramic crafts.
Does not contain preservatives, and uses liquid paraffin as oily component, which is non-toxic and tasteless and safe to use. It hardly evaporates and dries at room temperature, so it has good long-term stability. The processing is easy, and the bamboo knife can be used without hand contact at high temperature. Adding metal soap can not only improve the affinity between inorganic fillers and oil components, but also improve the viscosity of oil sludge. Adding liquid paraffin into oil components can improve the plasticity of oil sludge.
It's best to put it in a fresh-keeping bag and put it in the refrigerator. So a week or two is not a problem. After such a long time, I basically got dirty and threw it away. The beautiful model is not willing to be destroyed, so it is better to keep it like this, otherwise it will be easy to air dry if it is left outside for a long time. You can also put it in an eggshell, so that it will remain as soft as ever after a few days and nights. Because plasticine contains mineral oil, even if it is exposed to air, clay will not dry and harden due to the unfavorable volatility of oil.
Clay is generally formed after aluminosilicate minerals are weathered on the earth's surface. But some diagenesis can also produce clay. The appearance of clay in these processes can be used as a sign of the progress of diagenesis. Clay is an important mineral raw material. It consists of various hydrated silicates and a certain amount of alumina, alkali metal oxides and alkaline earth metal oxides, and contains impurities such as feldspar, mica, sulfate, sulfide and carbonate.
Clay minerals are fine, often in the range of colloid size, crystalline or amorphous, most of them are flaky, and a few are tubular and rod-shaped. Clay minerals are plastic when wetted by water, can be deformed under small pressure and can remain unchanged for a long time, and have large specific surface area and negatively charged particles, so they have good physical adsorption and surface chemical activity, and have the ability to exchange with other cations.
Clay is generally formed by weathering silicate minerals on the earth's surface. Generally, it is called primary clay or primary clay, which is weathered in situ, with large particles and composition close to the original stone. This kind of clay is mainly composed of silica and alumina, which is white and fire-resistant, and is the main raw material for preparing porcelain clay. Clay continues to weather and become young, and then it is transported by running water and wind, and a thick layer of clay is formed downstream, which is called secondary clay or secondary clay.
Because of pollution, this kind of clay contains many metal oxides, dark color and low fire resistance. Because of its good viscosity and plasticity, it is the main raw material for preparing clay.