Dust-free chalk
A technology of chalk and gypsum powder, which can be applied to pencil lead, household utensils, applications, etc., and can solve problems such as affecting the health of teachers, flying chalk dust, and excellent products
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Embodiment 1
[0011] Example 1, a kind of dust-free chalk is made of the following raw materials with the following weight ratio,
[0014] Color paste 4.5
[0015] Polyvinyl alcohol aqueous solution 2
[0016] Water 29.
[0017] The components are mixed and stirred uniformly and then extruded into a shape. After drying, they are dipped and coated with an aqueous solution of polyvinyl alcohol and dried.
Embodiment 2
[0018] Example 2, a kind of dust-free chalk is made of the following raw materials with the following weight ratio,
[0019] Calcium carbonate 34.0
[0020] Gypsum powder 34.0
[0021] Color paste 3.5
[0022] Polyvinyl alcohol aqueous solution 1.0
[0023] Water 28.5.
Embodiment 3
[0024] Example 3, a kind of dust-free chalk, is made of raw materials with the following weight ratios,
[0025] Calcium carbonate 36.0
[0026] Gypsum powder 36.0
[0027] Color paste 6.5
[0028] Polyvinyl alcohol aqueous solution 3.5
[0029] Water 30.5.
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