Preparation method of water reducing agent for electronic ceramic spraying granulation slurry

A technology of spray granulation and electronic ceramics, which is applied in the field of preparation of water reducers for spray granulation slurry of electronic ceramics. Good stability, no color change effect

Inactive Publication Date: 2008-06-18
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that the molecular weight of the control adjustment is not suitable, which causes the dispersion of the water reducing agent to be unstable.

Method used

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  • Preparation method of water reducing agent for electronic ceramic spraying granulation slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a water reducer for electronic ceramic spray granulation slurry, comprising the following steps:

[0025] (1) Proportioning the following component raw materials:

[0026] Raw material specification dosage (mol percentage)

[0027] Acrylic acid Polymer grade, >99% 7.1236

[0028] Concentrated ammonia, analytically pure, 28% 10.5522

[0029] Hydrogen peroxide solution Analytical grade, 30% 1.0502

[0030] Secondary deionized water 79.2388

[0031] Isopropanol Chemically pure, >98% 2.0378

[0032] Hydroquinone Analytical grade 0.0023

[0033] (2) According to the ratio, acrylic acid is pumped into the neutralization reactor through the vacuum system, and neutralized with concentrated ammonia water until pH=9-10.

[0034] (3) Take one-ninth of the weight of the neutralizing solution, then add isopropanol, water, and hydrogen peroxide solution with a ratio of 2 / 3 according to the proportion, stir evenly, and then mix with eight-ninths of the wei...

Embodiment 2

[0037] In step (1), except that the concentration of strong ammonia water is 26%, steps (1), (2), and (3) are the same as in Example 1, and in step (4), after the polymerization solution is cooled to 25° C., add the hydroquinone, and drop concentrated ammonia water, neutralize the solution to PH=8, stop stirring, and obtain a weakly alkaline water reducer product.

Embodiment 3

[0039] In step (1), except that the concentration of strong ammonia water is 25%, steps (1), (2), and (3) are the same as in Example 1, and in step (4), after the polymerization solution is cooled to 25° C., add the hydroquinone, and dropwise added concentrated ammonia water, the solution was neutralized to PH=8.5, and the stirring was stopped to obtain another weakly alkaline water reducer product.

[0040] Examples of the application of the water reducing agent of the present invention in the preparation of zinc oxide resistors:

[0041] 1. Addition amount: between 0.4% and 1.1% of the dry material amount, and select the best addition amount through experiments (generally, the solid content of the spray-dried granulation slurry is about 65%, and the water content is about 35%).

[0042] 2. How to join

[0043] First, the amount of water that should be added according to the formula requirements is divided into three appropriate parts: respectively used to dilute the optimal...

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Abstract

The invention discloses a preparation method for water reducing agent which is used in electronic ceramic spray granulation slurry. The invention comprises the steps: the raw materials are matched firstly, and the acrylic acid is added with strong aqua ammonia for neutralization; the neutralization solution is divided into two parts in the weight of one ninth and eight ninth, wherein the neutralization solution of one ninth is added with isopropanol, water and hydrogen peroxide solution, and then is mixed round equably, and is polymerized with the neutralization solution of eight ninth, and is heated to 60 DEG C to 65 DEG C; and the mixed solution is in constant temperature, and is dripped with hydrogen peroxide solution within 1.5 hours, afterwards, which is heated to 94 DEG C continuously and is in heat preservation for 5 hours; while being stirring, the mixed solution is added with hydroquinone and strong aqua ammonia, so that the pH of the solution is neutralized to 7 to 8.5; after stop stirring, the molecular weight polypropylene ammonium water reducing agent product with stable performance and strong dispersancy is generated.

Description

technical field [0001] The invention relates to a method for preparing a water reducer for electronic ceramic spray granulation slurry. Background technique [0002] The production of modern technical ceramics, such as sensitive components such as zinc oxide varistors, thermistors, ceramic capacitors, magnetic components, alumina fine ceramics, etc., adopts advanced spray drying granulation and dry pressing or isostatic pressing at home and abroad. Molding process to improve product quality and save energy. First of all, spray-drying granulation needs to use micropowder raw materials with particles of about 1μ to prepare an aqueous solution mixture slurry with a solid content higher than about 65% and good fluidity and stability. If such substances as water reducers are not used, generally only slurry with a solid content of about 35% and a moisture content of more than 60% can be prepared. This not only consumes a lot of energy and takes a long time for spray drying and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63
Inventor 戴洁梅姚军
Owner CHINA XD ELECTRIC CO LTD
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