In fact, heating underwear is not a "high-tech". Because any material can generate heat by absorbing water. The mechanism of fiber moisture absorption and heat generation is that when fiber absorbs water, hydrophilic groups in fiber molecules combine with water molecules, and the kinetic energy of water molecules decreases, and at the same time it is converted into heat energy and released. Generally, the moisture absorption and heating performance is closely related to the moisture regain of fibers. Fiber has high moisture regain and poor moisture absorption and heating performance. For example, wool and modal fibers have good moisture absorption and heating effects, while ordinary acrylic fibers and polyester fibers have poor moisture absorption and heating effects.
The heating mode of far infrared fiber is to absorb heat first and then release heat. Zhang Tianjiao said that it absorbs two kinds of energy: one is energy in the environment, such as visible light, infrared light and far infrared light in sunlight; Another kind of energy is the heat of the environment and the heat of the human body itself. After absorbing these energies, the far infrared fibers will transform them into far infrared rays and radiate them to the human body, thus providing heat for the human body. Selam is a kind of far-infrared radiation acrylic fiber, which is obtained by adding far-infrared radiation ceramic particles into acrylic fiber through advanced spinning technology.