Rolling-drying-steaming process is a common process of Basic Rhodamine B. Urea is often used in this process, which brings many environmental problems. In addition, the application of Basic Rhodamine B is also affected by its migration, low fixation rate and high energy consumption. According to this process, dyeing and fixing of Basic Rhodamine B are closely related to the moisture and moisture content of the fabric. Especially when the fabric is soaked, rolled and dried and enters the steaming box, the temperature rises quickly, and the phenomenon of overheating (i.e. over the steam temperature) occurs, which greatly reduces the dyeing speed of Basic Rhodamine B, reduces the fixation rate, and has low penetration and levelness. Therefore, wet short steaming process with various heating carriers has been developed in recent years.
Usually, when dry fabrics enter the steaming box, even if they are saturated with steam, the following four processes will occur: preheating, heating, superheating, cooling and steam temperature balance. The first stage of preheating is through vapor-heat exchange with steam. When the vapor temperature is reached (100 ℃), not only the chemical adsorption (hydrogen bond) between water molecules and cellulose molecules causes the fabric to overheat rapidly, which reduces the swelling of fibers and the dissolution of alkaline rose essence, but also speeds up the hydrolysis of Basic Rhodamine B. It is extremely resistant to reactive 310 Rhodamine B dyeing and fixing. The wet cloth entering the steaming box can not only delay the heating rate, keep more moisture in the fibers, but also prevent overheating, which is beneficial to dyeing and fixing of Rhodamine B dye. As long as the temperature content of the fabric is controlled and adapted, the hydrolysis of Basic Rhodamine B can also be reduced. Of course, the fabric with too much water will not only increase the temperature too slowly, but also accelerate the hydrolysis rate. For cotton fabrics, 25-30% moisture content is more appropriate. The wet short steaming process developed in recent years, although equipped with different equipment, is wet steaming. Especially through strict and precise control by computer, the temperature and the dyeing and fixing speed of Basic Rhodamine B can be adapted to achieve better dyeing and fixing.
Basic Rhodamine B is a powdery basic dyes with toxicity. It is dangerous to eat it by mistake. After eating it by mistake, we should adopt the correct first aid method in time. Today, we introduce the first aid method to be adopted after eating it by mistake. After eating by mistake, there is obvious irritation and pain, and it will cause difficulty in breathing, which can easily lead to asphyxia. First of all, we should let the mistaker carry to the place where the air circulation is better, and take a large amount of water to dilute the Basic Rhodamine B, immediately call the hospital phone for help.
Through the above introduction, we believe that you have a deeper understanding of Basic Rhodamine B.
Post time: Jun-20-2019