Moisture absorption is one of the indicators of the physical properties of fibers. The ability of fiber materials to absorb water from the gaseous environment is usually called moisture absorption.
It means that the material can absorb in the airwaterThe nature of points.This property is related to the chemical composition and structure of the material.aboutInorganic non-metallic materialsIn addition to the chemical properties of the surface of the material, it is also related to the microstructure formed by the material. If there are many pores, their moisture absorption capacity is relatively strong. In addition, it is also related to the diameter and structure of the pores.aboutOrganic polymer materialsSo it is.The metal surface also has the property of adsorbing water molecules, and the property of metal elementssurface structure Status dependent.
Moisture absorption andWater absorptionDifferent, water absorption refers to the property of absorbing water when the material contacts with liquid water.
Moisture content in the fibrous material, i.eAdsorbed waterContent, usually withregain(Moisture register) orWater content(Moisture content).The former refers to the percentage between the moisture content of the fiber and the mass of dry fiber, and the latter refers to the percentage between the moisture content of the fiber and the actual mass of the fiber.chemical fiberThe industry generally uses moisture regain to indicate the strength of the fiber's moisture absorption.
Moisture regain in standard state and official moisture regain
Multifilamentarypractice moisture regain It varies with the ambient temperature and humidity. In order to compare the moisture absorption capacity of various fibers, we put them in a unifiedStandard atmospheric conditionsAfter a certain period of time (20 ℃, 65% relative humidity)regainWhen a stable value is reached in the moisture absorption process, the moisture regain at this time is the moisture regain under the standard state.
2. The indirect measurement method is based on the principle that the amount of water contained in fiber materials is closely related to some physical properties (capacitance, resistance, vibration absorption performance of water molecules, etc.).
