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Preparation method and production device for moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder

A magnesium oxide powder, electrical grade technology, applied in the direction of magnesium oxide, etc., can solve the problems of incomplete dispersion and coating of moisture-proof agent, inability to realize efficient utilization of silicone moisture-proof agent, failure to meet high standard requirements, etc., to achieve moisture-proof Excellent hydrophobicity, thin coating of moisture-proof agent, and improved service life

Inactive Publication Date: 2019-09-20
LIAONING JIASHUN CHEM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing moisture-proof process, the moisture-proof agent and the diluent carrier are diluted and mixed, the dilution efficiency is poor, the uniformity is difficult to control, and the production efficiency is low, and the efficient utilization of the silicone moisture-proof agent cannot be realized. The poor dilution efficiency of the moisture-proof agent further leads to The moisture-proof agent is uniformly dispersed and coated on the surface of magnesium oxide particles, and the coating is incomplete, and the moisture-proof performance is low and unstable, which is difficult to effectively control and cannot meet the high standard requirements

Method used

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  • Preparation method and production device for moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder
  • Preparation method and production device for moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder
  • Preparation method and production device for moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder

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preparation example Construction

[0021] The invention discloses a preparation method of moisture-proof and hydrophobic medium-temperature electrical grade magnesium oxide powder, which comprises the following steps:

[0022] Step S1: Prepare an electrical grade magnesium oxide powder base material with a particle size of 50 mesh to 325 mesh. The specific preparation method is as follows: large crystal fused magnesia sand is pulverized, sieved, and magnetically separated to obtain large crystal magnesia powder; sieving machine and / or ultrasonic vibrating sieving machine) to make 50 mesh to 325 mesh electrical grade magnesium oxide powder base material. Other existing preparation methods of any electrical grade magnesia powder base material are also available.

[0023] Step S2: Use the ultrasonic mixing method to uniformly mix the moisture-proof agent and the diluent to prepare the diluted moisture-proof agent. The viscosity of the diluted moisture-proof agent is 50-60 (25°Cmm 2 / s). This viscosity range can...

Embodiment 1

[0035]1) The large crystal fused magnesia sand is pulverized, sieved, and magnetically separated to obtain a large crystal magnesia powder.

[0036] 2) Sieving the large crystalline magnesium oxide powder obtained in step 1) through a vibrating screen to prepare a 50-325 mesh electrical grade magnesium oxide powder base material.

[0037] 3) Put the moisture-proof agent methyl hydrogen-containing silicone oil and D60 solvent oil at a weight ratio of 3:1 and mix them in an ultrasonic mixer for 15 minutes. The frequency range of ultrasonic mixing is 45kHz / m 3 , the energy is 10 kWh, and the diluted methyl hydrogen-containing silicone oil moisture-proof agent is prepared.

[0038] In this example, the hydrogen content of methyl hydrogen-containing silicone oil is ≥5.55 (﹪, m / m), and the viscosity is 500-1000 (25°C mm 2 / s).

[0039] 4) Place the diluted methyl hydrogen-containing silicone oil moisture-proof agent obtained in step 3) in a microwave atomizer, and carry out atomiz...

Embodiment 2～8

[0042] Prepared by the same method and steps as in Example 1, changing the weight and number ratio of methyl hydrogen-containing silicone oil and D60 solvent oil, the frequency of sound waves, and changing the weight and number ratio of the diluted moisture-proof agent and magnesium oxide base material, and the remaining parameters All unchanged, the finished product moisture-proof magnesium oxide was obtained. The parameters of the reaction are shown in Table 1.

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Abstract

The invention discloses a preparation method and a production device for moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder. The preparation method includes the following steps: step S1, preparing an electrical-grade magnesium oxide powder base material having the particle diameter of 50 meshes to 325 meshes; step S2, mixing organic silicone oil with a diluent according to an ultrasonic mixing method to obtain a diluted moisture-proofing agent with the viscosity of 50-60 (25 DEG C mm<2> / s); step S3, atomizing the diluted moisture-proofing agent, and electrostatically spraying the diluted moisture-proofing agent to the surface of the electrical-grade magnesium oxide powder base material; step S4, performing drying to obtain the moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder. The moisture-proof and hydrophobic medium-temperature electrical-grade magnesium oxide powder prepared by the preparation method has remarkably improved hygroscopicity and water resistance, and excellent moisture proofing and electrical insulation properties; the service life of produced electric heating elements is long.

Description

technical field [0001] The invention relates to the field of manufacturing special-purpose magnesium oxide, and more specifically, relates to a preparation method and production device of moisture-proof and hydrophobic medium-temperature electrical grade magnesium oxide powder. Background technique [0002] There are hundreds of kinds of magnesium compound products needed for national economic construction, among which the magnesium oxide series products have the largest demand and the most varieties. [0003] China-specific magnesium oxide includes activated magnesium oxide, electrical grade magnesium oxide, silicon steel grade magnesium oxide, high-purity magnesium oxide, etc. [0004] The production of electrical grade magnesium oxide in China started in the 1960s. With the increase in sales of electric heaters, the demand for magnesium oxide as an insulating material has also continued to grow. Because the electrical grade magnesium oxide is directly related to the serv...

Claims

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Application Information

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IPC IPC(8): C01F5/02
CPCC01F5/02
Inventor 王继奇高斌史生川倪奎皓
Owner LIAONING JIASHUN CHEM SCI & TECH CO LTD
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