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Method for producing blackboard and whiteboard made from enamel in super strength, and glaze of enamel

A technology for enamel glaze and a manufacturing method, applied in the field of stationery, can solve the problems of inability to ensure dimensional stability, thermal deformation of thin steel plates, brittle and toughness of enamel, etc., and achieve the effects of strong hardness, low cost and good adhesion effect.

Inactive Publication Date: 2004-08-11
王强
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Problems solved by technology

Therefore, the problem is that the enamel film on the thin steel plate will cause a large degree of thermal deformation of the thin steel plate when it is fired, and the stability of the required size of the product cannot be ensured.
In addition, ordinary enamel is fragile and has poor toughness, and it is easy to peel off during bending. Therefore, enamel blackboards need glazes with excellent adhesion and adhesion.

Method used

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  • Method for producing blackboard and whiteboard made from enamel in super strength, and glaze of enamel
  • Method for producing blackboard and whiteboard made from enamel in super strength, and glaze of enamel

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Embodiment

[0012] In the present invention, the enamelling temperatures of the bottom glaze and the surface glaze should differ by more than 80°C. Because the process of enamel firing is the process of melting and releasing. If the enamelling temperature of the bottom glaze and the top glaze is too low, pinholes and air bubbles will easily occur when the top glaze is enamelled.

[0013] 1. The manufacture and enamel firing process of the bottom glaze

[0014] Weigh chemical raw materials according to the formula listed in Figure 1, and mix them thoroughly through pulverization. When the heating temperature of the rotary kiln reaches 1200°C, pour the mixture into the kiln, and the kiln body continues to be heated, rotated and stirred. The mixture is allowed to fully react and melt to form a melt. After being tested by wire drawing, knot measuring, bending and other methods, the molten material is poured into cold water and cooled to form crushed glass-like crystals, which are the raw m...

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Abstract

A process for preparing the super-strength enamelled black (or white) board includes such steps as praying the priming enamel, sintering at 680-740 deg.c for 3 min, spraying surficial enamel and sintering at 560-640 deg.C for 3-4 min. Its enamel contains Al2O3, B2O3, CaF2, Na2O or Li2O, BaO or PbO or CaO, and SiO2 or TiO2. Its advantages are super strength and high antiwear performance.

Description

Technical field: [0001] The invention relates to the technical field of stationery, in particular to a method for manufacturing super-strength enamel blackboards and whiteboards and enamel glazes. Background technique: [0002] At present, the teaching blackboards used in domestic education circles are generally glass frosted blackboards. This kind of glass blackboards has unsolvable defects such as large dust, high reflectivity, and easy breakage. In addition, resin blackboards and metal magnetic blackboards that have been used in recent years have solved the defects of glass blackboards, but because the board surface uses organic coatings, the abrasion resistance of the board surface is poor, which affects the service life of the blackboard. This is also a waste of resources. Chinese Patent No.: 98112246 discloses a patent of invention entitled "Magnetic Resin Composite Sheet and Clean Blackboard Manufacturing Method", which is exactly a kind of resin blackboard. In rece...

Claims

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Application Information

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IPC IPC(8): B43L1/06C03C8/06C03C8/22C04B28/02
CPCC03C8/06C04B28/02
Inventor 王强熊天英
Owner 王强
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