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In addition to translation/interpretation and electrical development work, this section introduces the following chemical-related projects that I have worked on in the past, including fiber processing and polymers.

繊維の染色加工(本ページ記事②参照) 高分子の合成 (本ページ記事③参照)

高分子の分解(本ページ記事④参照)  樹脂加工 (本ページ記事⑤参照)

Dyeing and processing of fibers (see article (2) on this page) Synthesis of polymers (see article (3) on this page)

Decomposition of polymers (see article (4) on this page) Resin processing (see article (5) on this page)

技術開発(2)繊維加工、高分子開発作業内容 Technology Development (2) Fiber Processing, Polymer Development Work

  ②繊維の染色加工  Textile dyeing and processing




It is said that the ideal hue and density of dyeing is the black of a crow's wet feather color. Conversely, dyeing methods and dyestuffs that do not produce a good black color may be immature as a technique or product. There are about 10 kinds of dyes chemically, and there are various dyeing methods depending on dyes and fibers.

In dyeing that uses a large amount of water, energy, and chemicals, it would be an environmental and energy measure if it could be processed with as little water as possible. This will be a major issue to be addressed in the future.

(Perspectives from the SDGs: To starting a super eco-dyeing lab)

③高分子の合成  Polymer Synthesis



Car tires are made of steel, nylon, and polyester physically laminated together. During the two years that the company I worked for sent me to a national university, I had attempted to synthesize a completely new polymer by chemically bonding and polymerizing nylon directly to a rubber polymer (see photo). Physical mixing and chemical bonding are not similar at all.

(Perspective from the SDGs: This can simplify waste disposal.)


④高分子の分解  Polymer degradation



In the 1970s, there was a problem in the U.S. when there were many burns and deaths due to accidental ignition of children wearing synthetic fiber pajamas. In order to prevent the recurrence of this problem, I applied the idea of preventing forest fires from spreading. In forest fires, there is a method to stop the spread of fire by clearing the forest ahead of where the fire is going. Of course, the chemical method introduced here does not look like an actual fire; it is in the world of molecules and atoms. The idea is to use the thermal radicals (active atoms) generated by the heat of ignition for self-destruction of the polymer itself, thereby preventing the spread of fire to clothing (textile polymers). If polymers with this property are skillfully used in textile processing, the energy of the fire ignited in the clothing can be reversed and fire retardant performance can be obtained.

(Perspective from SDGs: This improved flame retardant performance without the use of conventional bromine compound flame retardants.)

樹脂加工  Resin treatment


Unlike synthetic fibers, wrinkling of shirts made of natural fibers, especially cotton, after washing is a major problem, making ironing troublesome. Shape memory shirts were developed to solve this problem. Chemically, a resin is cross-linked to the hydroxyl groups of cellulose polymers to make the cellulose polymers less likely to move, thereby achieving the goal. Historically, the technology was under development more than 40 years ago, and I was involved in the development of this technology when I was a researcher at a textile company.

無機繊維の有機化と染料染色  Organicization of inorganic fibers and dye dyeing




Glass fiber is made from inorganic materials and cannot be dyed with organic dyes. (Inorganic and organic are like water and oil; they are mutually incompatible.)

However, if each fine fiber could be coated with organic polymer resin, the surface would be modified, and dyeing with organic dyes would be possible. This seeming contradiction is an "interesting" subject for research.

There are also many "fun" aspects to chemical research, such as how to efficiently coat all fibers thinner than a hair, and what to select as the coating polymer.

高水吸収性ポリマーの合成  Synthesis of highly water absorbent polymers





Around 1970, after reading certain technical literature from the UK, I synthesized a highly water-absorbent polymer as a confirmatory reproduction experiment. I remember that the synthesized polymer could retain about 25 times its dry weight of water.

This means that a bottle of Yakult lactic acid drink (80 cc) can retain water with only 3 grams of this polymer.

I reported the results of this experiment at an in-house research debriefing session, but none of the researchers around us showed any interest at the time. The results were not utilized.

Whenever I see today's widespread use of disposable diapers, etc., I remember with regret that I even reproduced the experiment ・・・・.

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