Chalk advertising language

2, chalk! An angel who only knows how to give.

3, chalk! Gently spread wisdom and hope. .

4, chalk! Covered with blackboards, leaving only hope on earth.

5, chalk, ordinary appearance, extraordinary heart.

6. Give your life in exchange for knowledge.

7. May my life whitewash the crystallization of wisdom for you.

8. Even a small piece of chalk can draw a beautiful chapter.

9. I'm not afraid of being crushed, only leaving my innocence in the world.

10, a piece of chalk is like a candle, illuminating the future of students.

First of all, chalk

Chalk is a widely used tool in daily life, and is generally used to write on the blackboard. Ancient chalk was usually made of natural chalk, but now it has been replaced by other substances. The main component of chalk is calcium sulfate, which is a white precipitate, not easy to decompose, and its particles are larger than dust. There are two kinds of chalk used in China: ordinary chalk and dust-free chalk. Their main components are calcium carbonate (limestone) and calcium sulfate (gypsum), or contain a small amount of calcium oxide.

Second, dust-free chalk

Dust-free chalk is an improved product of ordinary chalk, aiming at eliminating chalk dust pollution in the classroom. It just adds grease or polyol as a binder to ordinary chalk, and then adds fillers with higher specific gravity, such as clay, putty, cement, etc. , can increase the specific gravity and volume of chalk dust, making it difficult to fly away, but in practical application, its effect of reducing chalk dust pollution is not very obvious.

1. A small amount of chemical raw materials was added to the main components, which increased the proportion. Chalk is written on the blackboard, which is dust-free and clean, so as to prevent chalk foam from entering internal organs through breathing and causing occupational diseases.

2. Add a small amount of smoothing agent and adhesive, the chalk will not touch hands and clothes, and there is no white mark on the teacher's fingers after class, so there is no need to wash hands.

3. Add a small amount of moisture-proof agent, which will not deteriorate after long-term storage. Ordinary chalk is very easy to absorb moisture after being stored for a long time, and its hardness decreases, and writing is easy to break.

4. The blackboards used in schools include cement boards, wooden boards and frosted glass boards. Due to the different smoothness of the blackboard surface, the hardness and hardness of chalk are required to be different. The new generation of dust-free chalk can change its hardness at will, and it will not slip or break easily when used on various blackboards, and it is smooth, labor-saving and feels good.

Dust-free chalk is a newly developed high-tech product besides cosmetic materials for production. Environmental protection, non-toxic, dust-free, is the ideal teaching office supplies for modern teaching.

Third, non-toxic chalk.

Non-toxic chalk: it is the healthiest chalk in chalk. It is made of pure gypsum, solidified with water and dried. It is made of edible gypsum. This kind of chalk has been used in most foreign teaching since primary school.

1. Non-toxic chalk belongs to high-grade chalk. It is non-toxic in the dust pollution of classroom chalk. After the dust it produces is inhaled into the human body, the human body can directly discharge it through excretion and will not remain in the body. Even the production water has zero pollution to the river.

2. Non-toxic teacher chalk: The chalk used by teachers in teaching is specially designed for the teacher industry, and it is pollution-free and pollution-free.

3. Non-toxic children's graffiti chalk: According to children's usage habits, eating it in the mouth will not be a problem.