1) Selection of aminating agents. The maleic anhydride addition rosin resin and acrylic resin contain the active carboxyl group (-COOH) on the molecular chain side, and this functional group can form a salt with the amine to give the water solubility of the resin. The reaction can be shown as:
R-COOH+NH3î ‡R...COO-NH+4 ​​Water soluble (formation process of aqueous binder)
R...COO+NH+4î ‡R-COOH+NH3 Water insoluble (ink drying process)
The amount and type of amine have a great influence on the hydration of the resin and the properties of the printed film after hydration. Ammonia, monoethanolamine, triethanolamine, N,N-dimethylethanolamine, etc. can be selected. Ammonia-water and ink-drying inks have a fast odor. Triethanolamine has a strong corrosion effect on flexo plates. Monoethanolamine is a common aminating agent for ink-based resins. . The higher the degree of neutralization, the greater the viscosity of the ink, the general control of pH = 7.5 ~ 8.5 is better.
2) Amination composite method
Studies have shown that the amination complex is first dissolved in maleic anhydride resin dissolved in a complex solvent, while adding amination agent and acrylic emulsion, stirring constantly, after the end of feeding, continue stirring and insulation, until the system is even and transparent, ready-to-eat Waterborne composite acrylic flexo ink binders.
3.2 Selection of Pigments and Additives
The color of the water-based ink is expressed by the pigment, and the pigment adapted to the ink preparation must be alkali-resistant and have good dispersibility. The most suitable is the use of high solids pigment filter cake, its coloring power can be increased by 5% to 15%, bright color, low viscosity, the system is stable and easy to disperse, but the cost is high. In order to reduce the cost, this experiment selected brightly colored organic pigments such as Lisol Red, Gold Red, Indigo, Indigo Green, Benzidine Yellow, Permanent Yellow, etc. White is selected from titanium dioxide, and black is selected from high-pigment carbon black. , Filler selection of colloidal calcium carbonate. At the same time, in order to improve the dispersion and stability of pigments, surfactants are usually added. The properties of inks are mostly adjusted by suitable additives, such as wetting and dispersing agents and defoamers.
3.3 Ink Product Test Results
The above-mentioned developed aqueous flexo inks were tested. The results are shown in Table 1.
4 Conclusion
Developed functional acrylic emulsions and maleic anhydride-added rosin resins. In a mixed solvent system of water, a suitable amination agent was used to neutralize the two types of resins to form a water-based composite acrylic resin binder. This aqueous binder was used. It is formulated with high-quality pigments and fillers and carefully ground and dispersed to obtain a green, water-based flexographic printing ink with reasonable cost performance and suitable for decorating and printing.
Source: "Printing World"
Author: Cui Jinfeng
In recent years, Silicone Kitchen Tools were introduced into the market. What makes these silicone products different or more advantageous than the others? Why should we use silicone kitchen tools? Is it safe to use these products?
Silicone Cooking Utensils have high-heat resistance. It can withstand very high heat (some manufacturers claim heat resistance of up to 6000 Fahrenheit). If you're using silicone turners or whisks in cooking, you don't have to worry that it will melt when you accidentally leave it in the pot for a while.
Silicone Cooking Utensils are stain-resistant. This is because of the non-porous characteristic of silicone. So that it doesn't retain odors or colors when you use it for stirring deep-colored food like tomato-based food products. Have you experienced how difficult it is to remove spaghetti sauce stains on your rubber spatula. This also lends the silicone products to easier cleaning or washing.
Silicone cooking utensils are rubber-like. This makes them very user-friendly when dealing with non-stick surfaces. It cannot scratch or damage non-stick cooking pots and pans as wooden or metals spoons do. This flexibility makes it as useful as the rubber spatula in scraping clean those cake batter off the mixing bowl.
Silicone cooking utensils are non-corrosive and hard-wearing. Food grade silicone are very safe to use in any type of food. It does not react with food or beverages, or produce any hazardous fumes. This means that it will probably last longer than the other Kitchen Utensils.
Silicone cooking utensils are safe to use. In The Safe Use of Cookware article by Health Canada, it is mentioned "There are no known health hazards associated with use of silicone kitchen tools."Looking at the above-mentioned qualities of silicone kitchen tools, I think you will get your money's worth when you consider purchasing these items for use in your kitchen.
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