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Needle-like strontium carbonate fine powder and method for producing same

A strontium carbonate, acicular technology, applied in the field of acicular strontium carbonate micropowder and its manufacturing, can solve the problems of acicular strontium carbonate particle aggregation and achieve excellent dispersion

Active Publication Date: 2016-06-08
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fine needle-like strontium carbonate particles are prone to aggregation due to van der Waals forces

Method used

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  • Needle-like strontium carbonate fine powder and method for producing same
  • Needle-like strontium carbonate fine powder and method for producing same
  • Needle-like strontium carbonate fine powder and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] (1) Manufacture of needle-like strontium carbonate particle water-based slurry

[0096] 366 g of strontium hydroxide octahydrate (special grade reagent, purity: 96% or higher) was added to 3 L of pure water at a water temperature of 10° C. and mixed to prepare an aqueous suspension of strontium hydroxide having a concentration of 5.6% by mass. 14.2 g of DL-tartaric acid (special grade reagent, purity: 99% or higher) (0.039 g per 1 g of strontium hydroxide) was added to the strontium hydroxide aqueous suspension, and stirred to dissolve in the aqueous suspension. Next, the temperature of the strontium hydroxide aqueous suspension was maintained at 10° C. while continuing to stir, and a flow rate of 0.5 L / min (2.9 mL / min relative to 1 g of strontium hydroxide) was added to the aqueous suspension. ) to blow carbon dioxide gas until the pH of the aqueous suspension reaches 7 to generate strontium carbonate particles, and then continue stirring for 30 minutes to obtain an aq...

Embodiment 2

[0118] (1) Manufacture of Acicular Strontium Carbonate Micropowder

[0119] (a) Reaction process

[0120] 366 g of strontium hydroxide octahydrate (special grade reagent, purity: 96% or higher) was added to 3 L of pure water at a water temperature of 10° C. and mixed to prepare an aqueous suspension of strontium hydroxide having a concentration of 5.6% by mass. DL-tartaric acid (special grade reagent, purity: 99% or more) was added to the strontium hydroxide aqueous suspension, and stirred to dissolve in the aqueous suspension. Next, while maintaining the temperature of the strontium hydroxide aqueous suspension at 10°C, stirring was continued, and a flow rate of 3.75 L / min (22 mL / min relative to 1 g of strontium hydroxide) was injected into the aqueous suspension. Carbon dioxide gas was blown in until the pH of the aqueous suspension reached 7 to generate needle-shaped strontium carbonate particles. Then, stirring was continued for 30 minutes to prepare an aqueous suspensio...

Embodiment 3

[0130] (1) Manufacture of Acicular Strontium Carbonate Micropowder

[0131] (a) Reaction process? (b) Ripening process

[0132] In the reaction process of Example 2, the flow rate of carbon dioxide gas is set to 0.5L / min (2.9mL / min flow rate relative to 1g of strontium hydroxide), and the needle-shaped strontium carbonate particle aqueous suspension is Except for heat-processing at 95 degreeC for 12 hours, it carried out similarly to Example 2, and produced the aqueous slurry of acicular strontium carbonate particle.

[0133] (c) Surface treatment process

[0134] In the surface treatment process of Example 2, 16.24 g of Mariarim SC-0505K (manufactured by NOF Corporation) was added as Compound A (8 parts by mass relative to 100 parts by mass of strontium carbonate particles), and Compound C (Naimin S- 204) except that the addition amount was 46.69 g (23 parts by mass with respect to 100 parts by mass of strontium carbonate particles), and the surface treatment of the needle-...

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Abstract

A needle-like strontium carbonate fine powder which is a fine powder of needle-like strontium carbonate particles, and which has an average major axis length of 150 nm or less, an average aspect ratio of 1.5 or more, and a content of needle-like particles each having a major axis length of 200 nm or more of 5% or less in terms of the number of particles, said fine powder being characterized in that the surface of each of the needle-like strontium carbonate particles is treated with (A) a polycarboxylic acid having a polyoxyalkylene group in a side chain thereof or an anhydride of the polycarboxylic acid and (B) a compound having a hydrophilic group and a hydrophobic group and also having a group capable of forming an anion in water. The needle-like strontium carbonate fine powder has excellent dispersibility in a hydrophobic organic solvent or a polymeric resin solution prepared by dissolving a polymeric resin in a hydrophobic organic solvent.

Description

technical field [0001] The invention relates to acicular strontium carbonate micropowder and a manufacturing method thereof. Background technique [0002] It is known that a polymer resin molded article produced by applying pressure to a polymer resin in a specific direction exhibits birefringence. For example, polymer resin molded articles for optical materials represented by optical films produced by stretching a rolled film or optical lenses produced by injection molding generally exhibit birefringence. [0003] As a method for suppressing the birefringence that occurs in polymer resin molded articles, Patent Document 1 describes a method in which acicular strontium carbonate particles are dispersed in a polymer resin, and the birefringence generated by the orientation of the acicular strontium carbonate particles is used. Refraction to offset the birefringence generated by the orientation of the bonded chains of the polymer resin. However, in the method of dispersing s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/187C01P2002/84C01P2004/10C01P2004/51C01P2004/54C01P2004/62C01P2004/64C01P2006/12C01P2006/22C09C1/02
Inventor 日元武史野北里花福田晃一冈田文夫松永泰藏
Owner UBE IND LTD
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