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What are the reactive printing pastes?

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Obviously, the paste has become an important part of the printing paste. As a printing paste, it should have a high paste-forming ability. The chemical properties and dispersion state of the original paste should be quite stable and have appropriate rheological properties, adhesion, cohesion, low affinity for dyes and easy to wash off. There are many types of pastes. The pastes currently used by most companies can be roughly divided into the following categories: natural hydrophilic polymers, denatured materials of natural hydrophilic polymers, and synthetic hydrophilic polymers.

It is understood that direct printing with reactive dyes is currently the most commonly used process for pure cotton fabrics. Reactive dyes have wide chromatogram, good wet fastness, low cost, convenient printing and good uniformity. However, it can react with the hydroxyl group in the original polysaccharide paste to reduce the fixation rate of the dye, and at the same time make the original paste difficult to wash off and feel hard. Sodium alginateis an ideal paste with strong paste-forming ability, good permeability, no reduction, and a wide range of applicable pH values. It contains a hydroxyl group on each ring, which is a kind of hydrophilic organic substance, which can be ionized into negative ions and repel reactive dye ions. It is not easy to react with reactive dyes and has a dye-promoting effect.

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