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Hirakata, Japan

Tadanaga K.,Osaka Prefecture University | Tadanaga K.,Hokkaido University | Morita K.,Osaka Prefecture University | Morita K.,Nippon Bee Chemical Co. | And 2 more authors.
Journal of Sol-Gel Science and Technology | Year: 2013

Silica nanoparticles with high concentration were prepared by the sol-gel process based on the Stöber method using tetraethoxysilane as a starting material. It was found that silica sol with about 4 wt% in concentration and with a diameter of about 10 nm was obtained by controlling the reaction conditions in the Stöber process. By removing the solvent under a reduced pressure, the particle concentration was increased up to 15 wt% without aggregation. © 2013 Springer Science+Business Media New York. Source


Tanaka A.,Honda Corporation | Inoue T.,Honda Corporation | Mochizuki S.,Honda Corporation | Inoue M.,Nippon Bee Chemical Co.
SAE International Journal of Materials and Manufacturing | Year: 2013

Most types of paint materials currently used for motorcycles contain large amounts of VOCs (Volatile Organic Compounds). VOCs are environmental load substances, and there is a demand to reduce emissions in recent years. Many of a motorcycle's exterior parts are made of ABS (Acrylonitrile-Butadiene-Styrene) plastics (henceforth ABS) or PA (Polyamid) plastics (henceforth PA). These two plastic materials have different film adhesion mechanisms and adhesion strength. Therefore it was necessary to use different conductive primers and that's was one of the factors which made time and material losses in the painting processes. We solved those two issues, the reduction of VOCs and the common use of the same conductive primer for different parts materials, by combining two kinds of resins originally designed as the conductive primers, i.e., urethane resins with carboxylic acid groups and acrylic resins with amide groups, which are different in properties. Many of the plastic parts used in motorcycles are painted manually because there are difficult portions to be painted by automated painting machines. The viscosity was adjusted to satisfy both the controllability of paint sagging and the surface smoothness to keep the efficiency of paint workers' operations. Copyright © 2012 SAE International and Copyright © 2012 SAE Japan. Source


Patent
Nippon Bee Chemical Co., Kyoto Institute of Technology and Toyota Jidosha Kabushiki Kaisha | Date: 2010-02-26

There are provided: a bio-based coating composition which is a bio-based ingredient coating composition in consideration of environment and does not need any expensive ingredient and is also excellent in hydrolysis resistance; and an article coated with the coating composition. The bio-based coating composition is characterized by comprising the following film-forming ingredients: a lactic acid polymer (A) which contains a polyfunctional compound having a hydroxyl group and/or a carboxyl group in a functionality of not less than 3 and lactic acid as essential monomer ingredients and has a specific SP value; and a resin (B) which contains a hydroxyl group and/or a carboxyl group and has a specific SP value; wherein the difference (SP) between the SP values of the lactic acid polymer (A) and the resin (B) is in the range of 0.2 to 4.0. The coated article is characterized by being obtained by being coated with the aforementioned coating composition.


Patent
Nippon Bee Chemical Co., Kyoto Institute of Technology and Toyota Jidosha Kabushiki Kaisha | Date: 2010-05-26

There are provided a photosetting type bio-based coating composition and its coated article, wherein the coating composition has a sufficient hydrolysis resistance and a sufficient crosslinking density so as to be excellent in such as long-term stability, and is inexpensive, and is applicable also to an aqueous solvent. The photosetting type bio-based coating composition according to the present invention is characterized by comprising: a bio-based photopolymerizable compound as a film-forming ingredient which compound has at least one lactic acid unit and at least one photopolymerizable group together in a molecule; and a photopolymerization initiator. The coated article according to the present invention is characterized by being obtained by being coated with the aforementioned coating composition.


Patent
Nippon Bee Chemical Co. | Date: 2010-01-21

A method for forming a coating film able to reduce curing time, reduce the size of coating equipment and reduce the amount of CO

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