Recommendations for the use of water-based dispersants in water-based inks and other systems
1. Choose the right water-based dispersant
Understand the application scenario:
Choose the right type of dispersant according to the application field of the water-based dispersant (such as coatings, inks, plastics, etc.) and specific needs. The performance requirements of the dispersant may vary in different application scenarios. For example, the selection of dispersants in water-based inks needs to consider the pigment type, resin system and printing process requirements.
Pay attention to the dispersion performance:
high-quality dispersants should have good dispersion effects and enable particles to be dispersed evenly and stably in the water-based medium. When selecting, its dispersion performance can be evaluated through sample testing. For example, some dispersants have special dispersion effects on pigments such as carbon black and iron oxide, which can be selected in a targeted manner.
Consider environmental factors: Give priority to non-toxic, low-pollution, and biodegradable dispersant products to reduce the impact on the environment.
2. Determine the appropriate addition method
Stir thoroughly before use:
Before adding the water-based dispersant, the base material should be fully stirred to achieve a uniform mixing state so that the dispersant can more easily play a dispersing role.
Choose the right way to add:
Water-based dispersants need high-speed grinding or dispersion to achieve the desired effect. Therefore, it is necessary to choose the right way to add according to the product instructions or professional advice, such as using high-speed dispersers, media grinders and other equipment.
3. Control the amount of use
Add in moderation:
The amount of dispersant used should be moderate. Excessive use will not only increase production costs, but may also affect the performance of the material. The amount of water-based dispersant used for general pigments is between 0.5% and 1.5%, but the specific amount needs to be adjusted according to factors such as the type of pigment, specific surface area and dispersion fineness requirements. For example, the amount of dispersant used for iron oxide series pigments may require 4% to 8%, while it is 0.3% to 0.5% in latex paint.
Avoid waste: Accurately measure during the addition process to avoid waste and unnecessary cost increases.
4. Pay attention to environmental conditions
Control pH:
Some water-based dispersants have certain requirements for the pH value of the solution, so they need to be adjusted according to the properties of the dispersant to maintain a suitable pH value. For example, the pH value of water-based inks is generally controlled between 8.5 and 9.5 to ensure the stability of the dispersion and printing effect.
Pay attention to the influence of temperature: some dispersants are sensitive to temperature, and should pay attention to controlling the temperature to ensure that the dispersant has the best effect.
5. Storage and preservation
Storage environment: water-based dispersants need to be stored in a dry, cool, ventilated place, away from fire and organic matter.
Avoid mixing: different types of dispersants cannot be mixed, otherwise they will interact with each other, reduce the dispersion effect or cause product quality to decline.
6. Compatibility test
Compatibility with other ingredients: When using water-based dispersants, it is necessary to pay attention to its compatibility with other ingredients (such as resins, additives, etc.). Good compatibility can avoid adverse reactions or affect the performance of the final product.
Sample test: Before formal use, it is recommended to conduct sufficient compatibility testing and sample testing to ensure the compatibility of the dispersant with the system.
