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Cerium hydroxide heat stabilizer and preparation method thereof

A technology of cerium hydroxide and heat stabilizer, which is applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., and can solve problems such as complex process, high cost, and poor thermal stability effect

Inactive Publication Date: 2012-11-14
上海华明高纳稀土新材料有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The invention patent with the Chinese patent publication number CN101200556B discloses a synthetic method of a PVC heat stabilizer dicarboxylic acid rare earth salt; the above patents are all rare earth organic salts, and the synthesis process of this heat stabilizer is complicated and the cost is high
[0009] The heat stabilizers disclosed in the above invention patents are all composite heat stabilizers containing rare earths, which still have the disadvantages of complicated process and poor heat stabilization effect.

Method used

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  • Cerium hydroxide heat stabilizer and preparation method thereof
  • Cerium hydroxide heat stabilizer and preparation method thereof
  • Cerium hydroxide heat stabilizer and preparation method thereof

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preparation example Construction

[0032] On the other hand, the preparation method of cerium hydroxide thermal stabilizer of the present invention, it comprises the steps:

[0033] (1) Impurity removal: dissolve cerium nitrate in pure water, heat it to 70-90°C, add 30% hydrogen peroxide, adjust the pH value to 4.0-4.5 with ammonia water, and vacuum filter to obtain a clear and transparent cerium nitrate solution;

[0034] (2) Synthesis of cerium hydroxide: Add the above cerium nitrate solution to 30% hydrogen peroxide, adjust the pH value to 8.5-9 with ammonia water, heat to 70-90°C for 1.5-2h, and filter through plate to obtain cerium hydroxide filter cake;

[0035] (3) Preparation of heat stabilizer: drying and pulverizing the obtained cerium hydroxide filter cake to obtain the cerium hydroxide heat stabilizer.

[0036] In the present invention, in step (1), the cerium nitrate is dissolved in pure water, and the mass of cerium nitrate accounts for 30-40% of the sum of the mass of cerium nitrate and water; t...

Embodiment 1

[0040] (1) Impurity removal: 300kg cerium nitrate (CeO 2 / TREO≥99.9%) was dissolved in 700kg of pure water, heated to 70°C, added 30% hydrogen peroxide, and adjusted to pH 4.0 with 10% ammonia water. After vacuum filtration, a clear and transparent cerium nitrate solution was obtained.

[0041] (2) Synthesis of cerium hydroxide: Add the above cerium nitrate solution to 90 kg of 30% hydrogen peroxide, adjust the pH value to 8.5 with 10% ammonia water, heat to 70°C for 2 hours, and filter through a plate to obtain a cerium hydroxide filter cake.

[0042] (3) Preparation of heat stabilizer: the obtained cerium hydroxide filter cake was dried at 150° C. for 30 h, and then pulverized by air flow to obtain the cerium hydroxide heat stabilizer.

[0043] In the prepared cerium hydroxide heat stabilizer, the total amount of rare earth is 95%, and the content of cerium oxide (CeO 2 / TREO) is 99.98%, loss on ignition is 5%, average particle size D 50 is 1.19 μm. (see figure 1 )

Embodiment 2

[0045] (1) Impurity removal: 400kg cerium nitrate (CeO 2 / TREO≥99.9%) was dissolved in 600kg of pure water, heated to 90°C, added 30% hydrogen peroxide, and adjusted to pH 4.5 with 15% ammonia water. After vacuum filtration, a clear and transparent cerium nitrate solution was obtained.

[0046] (2) Synthesis of cerium hydroxide: Add the above cerium nitrate solution to 120kg of 30% hydrogen peroxide, adjust the pH value to 9 with 15% ammonia water, heat to 90°C for 1.5h, and filter through a plate to obtain a cerium hydroxide filter cake.

[0047] (3) Preparation of heat stabilizer: the obtained cerium hydroxide filter cake was dried at 180° C. for 20 h, and then pulverized by air flow to obtain the cerium hydroxide heat stabilizer.

[0048] In the prepared cerium hydroxide heat stabilizer, the total amount of rare earth is 95%, and the content of cerium oxide (CeO 2 / TREO) is 99.95%, loss on ignition is 5.4%, average particle size D 50 0.5 μm. (see figure 2 )

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Abstract

The invention aims to disclose a cerium hydroxide heat stabilizer and a preparation method thereof. The rare earth content of the heat stabilizer is 90-95 percent; the cerium oxide content (CeO2 / TREO) of the heat stabilizer is more than or equal to 99.9 percent; the burning weightlessness amount of heat stabilizer is 5-10 percent; and the average grain diameter D50 of the heat stabilizer is 0.5-3 microns. Compared with the existing product, a silicon rubber product prepared by using the cerium hydroxide heat stabilizer has the advantages of high heat-resistant performance, good product color and the like, so that the aims of the invention are fulfilled.

Description

technical field [0001] The invention relates to a heat stabilizer and a preparation method thereof, in particular to a cerium hydroxide heat stabilizer suitable for silicone rubber and a preparation method thereof. Background technique [0002] Compared with ordinary rubber, silicone rubber has excellent heat resistance, cold resistance, electrical properties, insulation and physiological inertia, etc., and is widely used in aerospace, aviation, electronics, electrical, construction, machinery, automobiles, instrumentation, chemical and fields of medicine and health. The most notable feature of silicone rubber is its excellent heat resistance, which can be used for a long time at a temperature of about 200 ° C, so it is widely used as an elastic material in high temperature applications. With the development of science and technology, the requirements for rubber heat resistance are getting higher and higher. For example, silicone rubber used for coating jet engines and prin...

Claims

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Application Information

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IPC IPC(8): C08K3/22C08L83/04C01F17/00
Inventor 赵月昌陈曦杨筱琼高玮蒙素玲
Owner 上海华明高纳稀土新材料有限公司
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