Correct use guide for dispersants in shoe coatings
Correct use guide for dispersants in shoe coatings
Dispersants in shoe coatings play a key role in shoe production, but only when used correctly can their effectiveness be fully exerted. Mastering the scientific method of use can make the dispersant and shoe coating work perfectly together to protect the quality of shoe materials.
When using dispersants in shoe coatings, you must first prepare for the addition
You need to select a suitable dispersant according to the type and formula of the shoe coating. Different coating systems, such as solvent-based and water-based shoe coatings, have different requirements for dispersants. If the wrong type is selected, the ideal dispersion effect may not be achieved, and even the performance of the coating may be affected. At the same time, check the shelf life and status of the dispersant to ensure that it has not expired, has no precipitation or stratification, and ensure the activity of the dispersant itself.
The next step is to control the addition process
The timing of addition is very important. It is generally recommended to add dispersants after the pigment is added to the shoe coating system and before the dispersion and grinding begins. This allows the dispersant to contact the pigment particles first, play a role in advance, and is more conducive to subsequent dispersion and grinding. Pour slowly when adding to avoid uneven dispersion caused by adding a large amount at one time.
The stirring and grinding process should not be ignored
After adding the dispersant, it is necessary to stir it thoroughly so that the dispersant is evenly distributed in the paint and fully contacts the pigment particles. The stirring speed and time should be appropriate. Too fast speed may bring in too much air to produce bubbles, while too slow stirring may not achieve the effect of uniform mixing; too short time will result in insufficient dispersion, while too long time may affect the performance of other components of the paint. For paint systems that require grinding, during the grinding process, the dispersant can assist the pigment particles in breaking up and prevent them from re-aggregating. At this time, the grinding time and intensity should be controlled to ensure that the pigment particles reach the ideal dispersion fineness.
In addition, there are some precautions for use
The amount of dispersant added should be strictly controlled, not the more the better. Insufficient addition will not effectively disperse the pigment; excessive addition may cause the stability of the paint system to decrease, and problems such as floating color and flowery flowers may occur. Usually, the amount of dispersant added is 1%-5% of the pigment mass, which needs to be determined through small tests according to the type of pigment, paint formula, etc. At the same time, the dispersant should be sealed and stored in a cool and dry place, away from fire and high temperature environment to prevent its performance from changing. During use, if it accidentally comes into contact with the skin or eyes, rinse with clean water and seek medical attention in time.
Proper use of shoe coating dispersants can maximize their effectiveness and ensure the performance of shoe coatings, thereby producing high-quality shoe products. Careful operation of each step is an important guarantee for improving the quality of shoe materials.