Views: 0 Author: Site Editor Publish Time: 2021-07-06 Origin: Site
Paste has become an important part of printing paste. As a printing paste, it should have a high paste-forming ability. The chemical properties and dispersion 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.
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 groups 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 alginate is 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 hydrophilic organic substance that can be ionized into negative ions and repel reactive dye ions, and it is difficult to react with reactive dyes to promote dyeing.