14 screen ink solid fastness. Nylon Flags The ink is the most important material, occupies an extremely important role in the process of the entire . Because of the objects is quite extensive, such as paper, Custom Flags And Poles metal, plastic, glass, wood, ceramics and a variety of textiles and so on. Therefore, proper understanding of the performance of the ink is the indispensable condition for the smooth conduct.
~ Silk screen ink is the most prominent issue is the of ink on the substrate after the regiment fastness. Nylon Flags No fastness, mean that there is no , but also cause a great waste. Fixation fastness issues related to the mechanism of adherence of the ink and the substrate. It is generally believed that affect the ink fixing fastness because the following inventory.
The ① resin. The resin is the main ingredient to constitute the ink binders, closely related to the fixed effect of the ink and resin properties.
a. Molecular weight. If the resin molecular weight and molecular weight of the substrate is too close to the ink solvent is not easy to select. If the molecular weight of the resin is too large, Order Custom Flags the ink to achieve the viscosity screen requirements, the ink in the solid (resin) content too little, resulting in solvent waste. High molecular weight, high melting point, difficult to dissolve in the solvent, the adhesion effect. If the resin molecular weight is too small, the cohesion and compatibility of poor adhesion effect backward. With the molecules of the ink resin satellite selection is important, must be fit.
and b. The glass transition temperature. Nylon Flags The movement of the polymer chain only above the glass transition temperature, the rate of diffusion. The whole chain of movement only at a higher temperature. Room temperature curing ink its resin glass transition temperature should be low, which is obviously favorable to the adhesion effect. For the heat-curable inks, the heating temperature should be higher than the glass transition temperature, Nylon Flags lower than the thermal deformation temperature of the substrates. Adhesion (drying) temperature effect and operation.
(c) The components of the resin. Functional groups in the resin molecule chain structure directly affect the ink on the substrate fixed effects, screen special inks for different substrates are increasingly specific. The single resin often can not meet the need for dedicated screen inks, in fact, two yuan or copolymer resins, hybrid resins, Custom Flags For Boats Nylon Flags fine texture of the ink resin modification methods can be formulated. Choose a suitable resin component fixation favorable.
(d) Elements of the resin monomer content. An element of the synthetic resin monomer content changes, the performance of the resin along with the changes. The design of ink formulations, Nylon Flags synthesis of some special resin, will be greatly improved ink performance. Change in an element content of the resin monomer will lead to prominent changes in certain characteristics of the resin.
e. Polarity, and the crystallinity of the resin. flag makers Nylon Flags Polarity is conducive to the existence of solid results, but the high polarity of the linear polymer, crystalline, can be used to destroy the crystalline copolymers and grafting on resin-modified to maintain polarity.