Journal of the Japan Society of Colour Material

Studies on an Emulsion Formation by Flow Jet Mixer

Comparison of Capabilities with Other Emulsifying Equipments and Effect of Tween as the Emulsifying Agent

Shun'ichi NORO, Akira TAKAMURA, Shigeki ANDO, Masumi KOISHI

1978 Volume 51 Issue 6 Pages 341-347
Published: June 20, 1978
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.51.341

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In this paper, the comparison of the capabilities of machines as emulsifying equipments and the effect of emulsifying agent were investigated for O/W emulsion.
Flow Jet Mixer, Agitator, and Colloid-Mill were used as emulsifying equipments. Salad oil and the mixtures of n-C₇H₁₆ and CCl₄ were employed as the dispersed phase.
The droplet size distributions were measured by the microscopic method. Furthermore, the emulsion stability was determined by the turbidimetric method, in the presence of Tween as emulsifying agent.
The following results were obtained.
(1) The size distribution curves of emulsions prepared by Colloid-Mill and Flow Jet Mixer had sharper and narrower variance.
(2) Increase of times of emulsification through Flow Jet Mixer gave the smaller size droplets for the O/W emulsion.
(3) For the O/W emulsions, the order of decreasing stability was Tween-20>Tween-40>Tween-80>>Tween-21>Tween-81.

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Preparation and Some Properties of Polyphthaloylpiperazine Microcapsules Containing Aqueous Sodium Alginate Solution

Kikuko TAKAHASHI, Nobuhiro MURAMATSU, Masumi KOISHI, Tamotsu KONDO

1978 Volume 51 Issue 6 Pages 348-354
Published: June 20, 1978
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.51.348

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A study was made of the preparation of polyphthaloylpiperazine microcapsules containing aqueous sodium alginate solution.
The size and size distribution of the microcapsules formed were determined and the factors affecting them were studied.
The size distribution curves and mean length diameters of the microcapsules were clearly found to shift towards the larger particle size side with increasing the polymerization degree of sodium alginate molecules used as a core material.
Inferring from the data of both the partition coefficient of piperazine and the percentage of reacted. piperazine with p-phthaloyl dichloride, the above mentioned results suggest that the final size of microcapsules is closely related to the reaction velocity at an early stage of the polycondensation reaction, i. e. the size of microcapsules is governed by the viscosity of aqueous sodium alginate solution.
From zeta-potential of microcapsules containing aqueous sodium alginate solution, it may be assured that sodium alginate molecules are encapsulated completely in the microencapsulation process.

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Present and Future inHeavy Duty Coatings

Yasushi SATO

1978 Volume 51 Issue 6 Pages 355-364
Published: June 20, 1978
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.51.355

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Non Aqueous Dispersion Coatings

Junichi MATSUZAKA, Osamu NAGURA

1978 Volume 51 Issue 6 Pages 365-370
Published: June 20, 1978
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.51.365

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Present Status and Future Trend of the Thermopaint

Satoshi TAKEUCHI

1978 Volume 51 Issue 6 Pages 371-378
Published: June 20, 1978
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.51.371

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