Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 83, Issue 10
Displaying 1-5 of 5 articles from this issue
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Original Technical Paper
  • Suitable Methoxysilane and Its Oligomer for Tensile Strength Improvement in Treated Paper Using Titanium Butoxide as Reaction Accelerator
    Osamu YAGI, Kazumi SUZUKI, Tomokuni ONOE, Fujio OHISHI
    2010 Volume 83 Issue 10 Pages 411-416
    Published: October 20, 2010
    Released on J-STAGE: January 20, 2011
    DOIhttps://doi.org/10.4011/shikizai.83.411
    JOURNAL FREE ACCESS
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    For investigating the suitable methoxysilane and its oligomer for improving the tensile strength of treated paper after its hydrolysis and poly-condensation, three methoxysilanes (tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane) and two oligomers (TMOS and MTMS oligomers) were impregnated into the base paper using titanium butoxide as the reaction accelerator. Among the three methoxysilanes, the highest impregnated weight (7.2 g/m2) was obtained when a TMOS solution was used. The highest tensile strength was obtained when an MTMS solution was treated (4.3 kN/m, 130% increase compared to the base paper). On the other hand, for the two oligomers, the highest weight was 50 g/m2 and the highest strength was 6.8 kN/m (200% increase) when an MTMS oligomer solution was treated. These differences in the improvement of the weight and strength between the monomer solutions and the oligomer ones were due to the monomer's high volatility. The reason why the MTMS oligomer produced the highest strength treated paper is attributed to its molecular characteristics. Because the MTMS has one unhydrolyzable group (methyl group) and three hydrolyzable groups (methoxy groups), it is assumed that the balance between the flexibility resulting from the methyl group and the hardness from the methoxy groups produced the moderate tension in the generated polymer. The MTMS oligomer has the same balance as the MTMS. Among the MTMS oligomers having different degrees (n=3.1, 4.4, 6.3, 8.7, 12.4 and 26.1), there was only a slight difference in strength. The most suitable methoxysilane compound for improvement of the tensile strength was the MTMS oligomer.
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Note
Materials
  • Novel Beads Mill for Submillimeter Beads
    Mitsuhiko OTSUKI
    2010 Volume 83 Issue 10 Pages 421-423
    Published: October 20, 2010
    Released on J-STAGE: January 20, 2011
    DOIhttps://doi.org/10.4011/shikizai.83.421
    JOURNAL FREE ACCESS
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    As technical innovations proceeds, miniaturization of functional particles has been required in most industries of mixing and dispersing of ink, paint, and materials for rechargeable batteries and electronics devices. Since the conventional mills cannot satisfy the needs of the users, development of high-performance mills is desired. We hereby introduce a new beads mill that can disperse submillimeter particles (under 0.1 mm) stably.
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Serial Lecture
  • Soluble and Insoluble Azo Pigments
    Kazuya NAKAMURA
    2010 Volume 83 Issue 10 Pages 424-429
    Published: October 20, 2010
    Released on J-STAGE: January 20, 2011
    DOIhttps://doi.org/10.4011/shikizai.83.424
    JOURNAL FREE ACCESS
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    Azo pigments are used in a wide variety of applications, especially for printing inks. They are classified into soluble azo, insoluble azo and condensation azo pigments by chemical structure. Soluble and insoluble azo pigments give color shade from yellowish to reddish, high color strength and excellent vividness. Their consumption occupies more than half of the whole organic pigment demand. In the present review the manufacturing process, property and detail of each structure are described.
    Furthermore, condensation azo pigments, which are characterized by excellent light fastness compared to the soluble and inisoluble types, are also covered.
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Serial Lecture
  • The Additives for the Coating Material
    Katsura NAGANUMA
    2010 Volume 83 Issue 10 Pages 430-439
    Published: October 20, 2010
    Released on J-STAGE: January 20, 2011
    DOIhttps://doi.org/10.4011/shikizai.83.430
    JOURNAL FREE ACCESS
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    Additive is one of the coating raw materials which prevent failure and defect and improve performance and function of coating materials and coated films. We explain the action mechanism and performance of thixotoropic agent that controls fluidity, and dispersant and surface modifier that control surface and interface. In the selection and usage of additives, a thorough preliminary examination is necessary under good understanding of the action mechanism, and it is important that the physical properties of the coated films are not deteriorated.
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