Preparation method of magnesia heat-conducting insulating material for electric heating tube

A thermally conductive insulating material, fused magnesia technology, applied in the direction of insulators, inorganic insulators, metal oxides, etc., can solve the surrounding environment and human hazards, loss of adhesion, moisture-proof and electrical performance, original structure damage and other problems, to achieve No pollution to the environment, good moisture-proof performance, and low leakage current

Active Publication Date: 2011-11-23
DASHIQIAO MEIR MAGNESIUM PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing commercially available home appliances, such as electric heating tubes used in rice cookers, soybean milk machines, water dispensers, etc., use heat-conducting insulating materials such as magnesium oxide powder added with silicone oil and silicone resin, although its electrical performance and moisture-proof performance can reach the standard Requirements, but there is a big defect, that is, when the temperature of the electric heating tube rises above 250°C after power-on, the polymer material silicone oil and silicone resin will gradually decompose, the original structure will be destroyed, not only lose the original Adhesive, moisture-proof and electrical performance, but also release toxic gas, causing harm to the surrounding environment and human body
Because a better solution has not been found for a long time, this situation has continued to this day

Method used

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  • Preparation method of magnesia heat-conducting insulating material for electric heating tube
  • Preparation method of magnesia heat-conducting insulating material for electric heating tube
  • Preparation method of magnesia heat-conducting insulating material for electric heating tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take the fused magnesia with a purity of 96% and grind it, and sieve it into oxides with different particle sizes of 50-60 mesh, 60-80 mesh, 80-140 mesh, 140-200 mesh, 200-325 mesh and -320 mesh. Magnesium powder;

[0016] (2) the above-mentioned magnesium oxide powders of different particle sizes are weighed successively in a weight ratio of 25%, 20%, 25%, 15%, 10% and 5%, and mixed;

[0017] (3) Utilize the dry type magnetic separator more than 18000GS of magnetic field strength to carry out deironing to the magnesium oxide powder of (2) step;

[0018] (4) Dry the magnesium oxide powder after iron removal at 300° C. for 45 minutes to remove moisture and volatile matter therein;

[0019] (5) carry out batching with the magnesium oxide powder of (4) step and following inorganic matter by weight:

[0020] 100 parts of magnesium oxide powder, 35 parts of talc powder with iron content below 0.1%, active α-Al with particle size of 1000 mesh 2 o 3 17 parts, 6 parts o...

Embodiment 2

[0027] The steps are the same as in Example 1, except that the rare earth catalyst cerium oxide is replaced by lanthanum oxide in step (5), and all the others are the same. The magnesium oxide heat-conducting insulating material has been tested in tubes, and its electrical properties are shown in Table 2:

[0028] Table 2

[0029]

[0030] Moisture-proof performance: the moisture resistance is 450°C; there is no gas and smoke emission during electrified work.

Embodiment 3

[0032] The steps are the same as in Example 1, except that the rare earth catalyst cerium oxide is replaced by samarium oxide in step (5), and the rest are the same. The magnesium oxide heat-conducting insulating material has been tested in tubes, and its electrical properties are shown in Table 3:

[0033] table 3

[0034]

[0035] Moisture-proof performance: the moisture resistance is 450°C; there is no gas and smoke emission during electrified work.

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Abstract

The invention discloses a preparation method of a magnesia heat-conducting insulating material for an electric heating tube. The preparation method comprises the following steps: crushing electric-fused magnesia powder with purity not less than 96% into magnesia powder with different granularities of 50-60 meshes, 60-80 meshes, 80-140 meshes, 140-200 meshes, 200-325 meshes and 320 meshes; mixing sequentially according to the weight ratio of 25%, 20%, 25%, 15%, 10% and 5%; deironing; stoving, sequentially and uniformly mixing with talcum powder, active alpha-Al2O3, mullite powder and rear earth catalyst according to 100, 35, 17, 6 and 2 parts by weight in sequence so as to prepare an environment-friendly magnesia heat-conducting insulating material for the electric heating tube. The property of the electric heating tube made from the heat-conducting insulating material cannot be changed when the temperature is over 250 DEG.C, cannot produce any toxic gas and cannot pollute the environment.

Description

technical field [0001] The invention relates to an electrical insulating material, in particular to a preparation method of a magnesium oxide thermally conductive insulating material for an electric heating tube that does not generate toxic gas at high temperature. Background technique [0002] Existing commercially available home appliances, such as electric heating tubes used in rice cookers, soybean milk machines, water dispensers, etc., use heat-conducting insulating materials such as magnesium oxide powder added with silicone oil and silicone resin, although its electrical performance and moisture-proof performance can reach the standard Requirements, but there is a big defect, that is, when the temperature of the electric heating tube rises above 250°C after power-on, the polymer material silicone oil and silicone resin will gradually decompose, the original structure will be destroyed, not only lose the original Adhesive, moisture-proof and electrical performance, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B19/00H01B3/10
Inventor 于翔鹤韩卓张衡耿小智
Owner DASHIQIAO MEIR MAGNESIUM PROD
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