Water-based colour paste dispersants: the right-hand man for universal colour pastes

Colour pastes play a vital role in many industries such as paints, inks, textile printing and dyeing, giving products a rich variety of colours.As a key additive, the dispersant of water-based colour pastes plays an indispensable role in improving the performance of general-purpose colour pastes.

I. The function principle of water-based colour paste dispersant

The main function of water-based colour paste dispersant is to disperse the pigment particles evenly in the aqueous medium and prevent them from regrouping.Pigment particles in the original state, due to the intermolecular force and other factors, it is easy to gather together to form larger agglomerates.The dispersant molecule has amphiphilic structure, one end of which can be adsorbed on the surface of the pigment particles to keep the pigment particles at a certain distance from each other to avoid agglomeration through the charge repulsion or spatial site-blocking effect; the other end of the dispersant has a good compatibility with the aqueous medium, so as to enable the pigment particles to be stably suspended in aqueous system to form a homogeneous colour paste.

2.Advantages for general-purpose colour pastes

1）Wide range of pigment applicability

General-purpose colour paste needs to be able to accommodate many different types of pigments, such as organic pigments, inorganic pigments and so on. By virtue of its unique molecular structure and mechanism of action, the dispersant can effectively disperse all kinds of pigments, whether it is phthalocyanine blue, carbon black and other common inorganic pigments, or azo, quinacridones and other organic pigments, can be uniformly dispersed under the action of it, to meet the needs of the universal colour paste on the diversity of pigments.

2）Good stability

In the process of storage and use of universal colour paste, stability is a key indicator. Water-based colour paste dispersant can provide long-term stable dispersion effect and prevent pigment from precipitation and delamination. This makes the general-purpose colour paste maintain uniform and consistent colour and performance under different environmental conditions, such as temperature changes, long time standing, etc., which ensures the quality stability of downstream products in the production process.

3）Excellent colour spreading

It helps the pigment to better display its original colour vibrancy and saturation. By evenly dispersing the pigment particles to the best state, it enables the pigments to cover the surface evenly when being applied to various substrates, reducing the appearance of defects such as colour bloom and colour spots, thus providing users with high-quality and pure colour paste products to meet the requirements of different industries for colour accuracy and aesthetics.

4）Environmental protection and safety

With the increasing awareness of environmental protection, water-based systems are more and more widely used in various industries. Water-based colour paste dispersants are in line with the trend of environmental protection, and their water-based formulation reduces the emission of volatile organic compounds (VOC), which reduces the pollution to the environment and the health hazards to the operators. The use of water-based dispersants in general-purpose colour pastes makes the colour paste products more environmentally friendly and safer, and adapts to the market demand for green products.

3, the use of precautions

When using water-based colour paste dispersant, you also need to pay attention to some problems. First of all, according to the specific pigment type and colour paste formula, choose the appropriate type of dispersant and additive amount. Different pigments and systems may have different requirements for dispersants, which need to be optimised through experiments. Secondly, when adding dispersant, the correct order of addition and mixing method should be followed to ensure that it can give full play to its function. Generally speaking, the dispersant should be mixed with part of the aqueous medium firstly, and then the pigment should be added for dispersing treatment, and sufficient mixing time and intensity should be ensured, so that the dispersant can be uniformly adsorbed on the surface of the pigment particles.

Water-based colour paste dispersant provides a strong guarantee for the performance improvement of general-purpose colour paste, playing an important role from pigment dispersion, stability to colour spreading and environmental protection.