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Sub-micron spherical strontium sulfate, and preparation and application thereof

A sub-micron strontium sulfate technology, applied in the direction of calcium/strontium/barium sulfate, fibrous filler, ammonium sulfide/polysulfide, etc., can solve the problem of high conductivity of strontium sulfate and avoid the increase of conductivity , Low impurity ions, high purity effect

Inactive Publication Date: 2013-12-25
GUIZHOU REDSTAR DEVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: overcome the high electrical conductivity of existing strontium sulfate, can not be applied to the defect of PCB (printed circuit board) paper substrate as filler, provide a kind of submicron spherical strontium sulfate, its purity is high, The whiteness is good, and the electrical conductivity is reduced by coating agent treatment, which improves the dispersion in the organic system and satisfies its application as a filler in paper PCB

Method used

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  • Sub-micron spherical strontium sulfate, and preparation and application thereof
  • Sub-micron spherical strontium sulfate, and preparation and application thereof

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preparation example Construction

[0034] A preparation method of submicron spherical strontium sulfate, the method comprises the following steps: the first step, the SrS solution with a concentration above 90g / L and a temperature ≥ 95°C is subjected to solid-liquid separation; the second step is the first step The concentration of the obtained SrS solution is adjusted to 40-45g / L, and the temperature is adjusted to 55-60°C (preferably 57°C); in the third step, under stirring, add an equimolar concentration of 140-160g to the SrS solution obtained in the second step / L (preferably 150g / L) (NH 4 ) 2 SO 4 Solution, control the reaction time in the range of 10-12 minutes, and then filter to obtain the filter cake; the fourth step, at a temperature of 90-95 ° C, use SrSO 4 In terms of weight, the obtained filter cake is coated with calcium stearate according to the proportion of 0.8-1.5% by weight to obtain a submicron spherical strontium sulfate product.

[0035] A kind of submicron spherical strontium sulfate ...

Embodiment 1

[0051] The concentration of the SrS solution was controlled at 90g / L, and the temperature of the solution was controlled at 95°C, then pressed and filtered, and the obtained clear filtrate was diluted with water to a SrS concentration of 40g / L. The SrS solution with a concentration of 40g / L was heated to 55°C, then placed in a synthesis reaction pot, the stirring speed was controlled at 30rpm, and an equimolar concentration of 140g / L (NH 4 ) 2 SO 4 solution, control the reaction time in the range of 10 minutes, then squeeze and filter, and the filtrate is recovered (NH 4 ) 2 S.

[0052] According to the ratio of material to water 1:5, use deionized water to beat the filtered cake into slurry, heat up and control the temperature of the slurry at 60°C, then adjust the pH value of the slurry to 1.5 with a sulfuric acid solution with a mass concentration of 98%, and then , stirred and washed for 1.5 hours, pressed and filtered to obtain a filter cake.

[0053] According to th...

Embodiment 2

[0056] The concentration of the SrS solution was controlled at 97g / L, and the temperature of the solution was controlled at 99°C, and then press-filtered, and the obtained clear filtrate was diluted with water to a SrS concentration of 45g / L. The SrS solution with a concentration of 45g / L was heated to 60°C, then placed in a synthesis reaction pot, the stirring speed was controlled at 35rpm, and an equimolar concentration of 160g / L (NH 4 ) 2 SO 4 solution, control the reaction time in the range of 12 minutes, then squeeze and filter, and the filtrate is recovered (NH 4 ) 2 S.

[0057] According to the ratio of material to water 1:5, use deionized water to beat the filtered cake into slurry, heat up and control the temperature of the slurry at 70°C, then adjust the pH of the slurry to 2.0 with a sulfuric acid solution with a mass concentration of 98%, and then , stirred and washed for 2.5 hours, pressed and filtered to obtain a filter cake.

[0058] According to the materi...

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Abstract

The invention relates to a sub-micron spherical strontium sulfate, and preparation and application thereof. The method comprises the following steps: 1. carrying out solid-liquid separation on an SrS solution of which the concentration is higher than 90 g / L and the temperature is greater than or equal to 95 DEG C; 2. regulating the concentration of the SrS solution obtained in the step 1 to 40-45 g / L, and regulating the temperature to 55-60 DEG C (preferably 57 DEG C); 3. while stirring, adding equal mol of (NH4)2SO4 solution (the concentration is 140-160 g / L, preferably 150 g / L) into the SrS solution obtained in the step 2, controlling the reaction time within the range of 10-12 minutes, and filtering to obtain a filter cake; and 4. coating calcium stearate, which accounts for 0.8-1.5 wt% of the SrSO4, on the filter cake at 90-95 DEG C, thereby obtaining the sub-micron spherical strontium sulfate product. The invention overcomes the defect that the existing strontium sulfate has high electric conductivity and can not be used in a PCB (printed circuit board) paper substrate as a filler. The sub-micron spherical strontium sulfate has the advantages high purity and favorable whiteness, has lower electric conductivity through the treatment of the coating agent, improves the dispersity in the organic system, and satisfies the application as a filler in a paper PCB.

Description

technical field [0001] The invention relates to a strontium sulfate and a preparation method thereof, in particular to a submicron spherical strontium sulfate used as a filler and applied to electronic substrates and its preparation. Background technique [0002] PCB substrates can be divided into five categories according to the reinforcing materials of the board: paper base, glass fiber cloth base, composite base, laminated multi-layer board base and special material base (ceramic, metal core base, etc.). Inorganic materials are usually added as fillers to paper-based PCB substrates, and barium sulfate is usually used as a filler material for paper-based PCBs in the prior art. [0003] Due to the high viscosity and poor dispersion of nanomaterials, the barium sulfate used as the filling material of the paper-based PCB is preferably submicron spherical barium sulfate. Therefore, the current focus of attention in this area is to carry out surface treatment to barium sulfate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/08C01C1/20C01F11/46
Inventor 姜志光华东刘正涛
Owner GUIZHOU REDSTAR DEVING
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