CN87204778U

CN87204778U - Magnetic blackboard

Info

Publication number: CN87204778U
Application number: CN 87204778
Authority: CN
Inventors: 柳立立; 邱事华
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-11-14
Filing date: 1987-11-14
Publication date: 1988-10-05

Abstract

The utility model relates to a magnetic blackboard, in particular to a magnetized iron blackboard. An amount of magnetic or paramagnetic powders, particularly magnetized iron powder, are mixed into the paint that composes the surface coating of the blackboard, or carpeted between the base material and the face plate with which the plate blank of the blackboard is formed. Thereby, the blackboard has the magnetic or paramagnetic behavior without affecting the original performance and quality of the blackboard. The utility model, which can be used on any of the existing blackboards, has the advantages that the cost for realizing the magnetic or paramagnetic behavior is low, and the source of material is comprehensive.

Description

Magnetic blackboard

The utility model relates to a kind of close magnetic or magnet board, the iron black plate of particularly a kind of magnetization.

Blackboard of the prior art form by slab and surface coating, and most of slab is formed by non-close magnetic material or nonmagnetic substance.As wooden blackboard, frosted glass blackboard etc.And all do not contain close magnetic material or magnetic material in the coating of all composition surface coatings, therefore, general blackboard does not all have close magnetic or magnetic, like this, owing to can not hang teaching aid by the suction-operated of magnetic, brought limitation for the purposes of blackboard, particularly using those slab materials hard, during the blackboard that can't nail, as frosted glass blackboard, " Compositive blackborad " etc., can't on blackboard, hang teaching aid at all, like this, bring very big inconvenience to teaching.

In the prior art, also have a kind of metal blackboard, its slab is a kind of sheet steel, and therefore, this blackboard has consumed a large amount of sheet steels, and this sheet steel not only costs an arm and a leg, and the source of goods is in short supply at home, and is often out of stock; Because sheet steel is not corrosion-resistant, causes the serviceable life of blackboard limited.In addition, this metal blackboard is heavy, and the carrying inconvenience is installed, and is not suitable for vast rural area of China and mountain area especially; The close magnetic that this blackboard had is that itself is intrinsic, is not a kind of decomposable, can be used in the technology on other blackboard, and therefore, the metal blackboard is used to be produced close magnetic technique and can't promote the use of on the blackboard of other kind.

Weak point of the prior art in view of the above, the purpose of this utility model is to provide low magnetic of a kind of cost or close magnet board, it is used for producing the technology of magnetic or close magnetic and can promotes the use of on the overwhelming majority's blackboard, on this basis, we further provide a kind of material that produces magnetic or close magnetic behavior, this material is called magnetization iron, is that the pigment of forming the blackboard surface coating possesses the performance that close magnetic of generation or magnet board are arranged again.

The purpose of this utility model is finished by following approach.

A kind of blackboard of forming by slab and surface coating, in forming the coating of surface coating, have a kind of powder of magnetic material or have a kind of powder of close magnetic material, the granularity of powder at least should be less than 0.1mm, and in the coating of unit weight, the weight of magnetic material or close magnetic material must not be greater than 3/4 of general assembly (TW), also must not be less than 1/4 of general assembly (TW).

Like this, we both can guarantee original performance of coating, can guarantee again to produce enough big absorption affinity between surface coating and outside magnetic material or the close magnetic material, with suspended item.

Said slab, can be a kind of slab of being made up of papery or wood composite formica, this technology be a kind of utility model application item, and name is called " Compositive blackborad ", application number is 87202270, is filed an application on February 18th, 87 by inventor of the present utility model.

Said powder is present in close magnetic material or the magnetic material between the surface coating, and the former is iron powder preferably, and the latter is preferably magnetized iron powder.

The said powder that is present in the magnetic material between the surface coating, preferably a kind of magnetization iron powder.

The magnetization iron powder can also be the black pigment of forming in the coating of surface coating, the black pigment of the amino unglazed blackboard paint of particularly blackish green epoxy.Like this, the magnetization iron powder just can replace the black pigment in the said coating, and therefore, the magnetization iron powder possesses the performance of being magnetic and pigment performance simultaneously.

Below we embodiment in will be in conjunction with the accompanying drawings the utility model is further described.

Embodiment:

A kind of magnet board, form by slab (1), surface coating (2) and magnetization iron powder (3), surface coating (2) is coated on the surface of slab (1), magnetization iron powder (3) is included in the coating of forming surface coating (2), in per kilogram coating, contain magnetization iron powder (3) 300 grams～500 grams, magnetization iron powder (3) should stir in coating, the general granularity of magnetization iron powder (3) is 0.08mm, the maximum 0.1mm that is no more than.The material of slab (1) is a kind of log, and said coating is the unglazed blackboard paint of blackish green epoxy amino.

Compared to existing technology, the utlity model has following advantage: when not affecting the original performance of blackboard, quality, blackboard has the performance of magnetic or close magnetic, and, realize that the technology of this performance almost can be promoted the use of on any blackboard; Compare with metallic blackboard, the utility model realizes that the spent cost of magnetic or close magnetic behavior is low, utilizes the waste iron filing raw material sources extensive. Like this, can be so that blackboard when having magnetic or close magnetic behavior, and have other weak points such as metallic blackboard easy-to-rust. Most critical be, if in Compositive blackborad, use this technology, then not only make Compositive blackborad possess all advantages that metallic blackboard is arranged, and, overcome other weak point of metallic blackboard.

Claims

1, a kind of blackboard of being made up of surface coating (2) and slab (1) is characterized in that,

(A) in the coating of forming surface coating (2), have the powder of a kind of magnetic or close magnetic material,

(B) granularity of said powder at least should be less than 0.1mm,

(C) weight of the powder of contained magnetic material or close magnetic material must not be greater than 3/4 of general assembly (TW) in the said coating unit weight, also must not be less than 1/4 of general assembly (TW).

2, according to claim 1 described blackboard, it is characterized in that said magnetic material powder is a magnetic iron powder, close magnetic material powder is an iron powder.

According to claim 1 described blackboard, it is characterized in that 3, the powder of said magnetic material is a kind of magnetization iron powder (3).