Temperature control and use of auxiliaries for high temperature and high pressure dyeing machines
Aug 24, 2022
The first is temperature. Temperature is the key to high temperature and high pressure dyeing machines. Increasing the temperature can effectively improve the dyeing rate of the entire disperse dyes. However, if the temperature is higher than 130 degrees, many The change of the dye uptake rate of the scattered dyes is no longer significant, so if the temperature is too high, the polyester ester bond will be hydrolyzed, resulting in a significant decrease in the elasticity of the fiber, and the shade will be relatively poor. , so under normal circumstances, the high temperature dyeing temperature cannot exceed 145 degrees, and the normal temperature can be kept between 125-130. If dyeing is carried out in this temperature range, not only the color volume will be relatively high, The whole leveling effect is also good. In order to allow the fuel to be evenly absorbed by the polyester, we should strictly control the heating rate. When the temperature reaches the specified temperature, a period of heat preservation should be carried out to dye, and the dyes can be abundant. Infiltration or diffusion, the normal heat preservation dyeing time is between 30-60 minutes. If you want the effect of light color, the time can be slightly shorter. If the dyeing is darker, the time is relatively longer. After the entire dyeing is completed, the cooling treatment should not be carried out too quickly, otherwise it will appear creases or affect the feel.
The second is the use of auxiliaries. At the same time, when dyeing at high pressure and high temperature, in order for the dye to be stably dispersed into the dye bath and to obtain a better leveling effect, we can properly participate in the dye bath. Auxiliaries such as leveling agent or dispersing agent.
The latter is the pH value. Many loose dyes will not actually show any hydrolysis under high temperature and alkaline conditions, so in the control of high pressure and high temperature dyebaths, they should work well under acidic conditions.
Auxiliary usage
1. Auxiliary agent: In the dye bath of high temperature and high pressure dyeing machine, an appropriate amount of leveling agent or dispersant can be added. The main purpose is to stabilize the dispersal of the fuel. However, if the addition of the auxiliary agent is excessive, then will have the opposite effect.
2. Temperature: Temperature is the key to the operation of high temperature and high pressure dyeing machines. Properly increasing the temperature of dyeing can effectively improve the dyeing rate, so the working efficiency is also improved, and the dyeing efficiency can be improved. However, here I want to remind everyone that the temperature has different effects on the dyeing effect at different stages. When the value exceeds a certain range, it will bring adverse effects on the dyeing effect, such as the appearance of color and light deterioration, etc. phenomenon, or directly reduce the effect of dyeing.
Therefore, the high temperature of the high temperature and high pressure dyeing machine should be 145 degrees, preferably between 120 degrees and 130 degrees. The temperature in this range is good, and the effect of dyeing is also strong. relatively uniform.