Glass is chemically stable inorganic material, hard, smooth surface with the ordinary kind of organic synthetic resin ink adhesion strength is not strong, and most transparent products, on the surface can not have ink spots. Therefore, the screen printing is the most suitable. Can be silicate glass screen printing surface of the screen printing way mainly logo decoration, scale, etc., in silicate glass products (generally for plate glass and glass bottle) surface of ink printing ink called glass screen printing office use. Here mainly refer to part of the glass screen printing ink and preparation and screen printing use should pay attention to matters. The first glass screen printing ink is mainly composed of three components: ink oil, glass glaze, and coloring.
Ingredient: ink oil
Glass screen printing ink, glass glaze oil ink, also known as suet (material), its main ingredients for a variety of synthetic resin oil or natural resin oil and high boiling point solvents, role in the glass screen printing ink formula is mainly to powdered glass glaze and toner pigment mix into a paste for screen printing. Printing dosage of oil in a glass screen printing ink formula has a certain controlling fastidious data, appropriate use of the material properties should be according to the formula system, in order to make easy for screen printing, and the glass surface screen printing, the phenomenon of the line is busy, not to use ink oil must be as little as possible. Glass screen printing ink (ink) of glass connection oil usually choose material rosin, turpentine oil, terpineol, frankincense, ethyl cellulose as formula materials, such as glass screen printing ink ink oil role not only in preparation for the screen printing process in glass glaze powder tune into a paste for printing, but also with its viscosity glass glaze powder temporarily attached to the sliding surface of the glass products, and in the process of high temperature baking flowers (fire) itself must all volatile burn again, so that the ink formula of glass glaze powder sinter on the surface of the glass products, into a colorful screen printing pattern and text. These have adhesion sex printing oil not only for the sake of their mixed with glass glaze powder when should have good wettability, but also should have certain drying speed and viscosity, can make the printing ink film thickness and strength.
Composition # 2: glass glaze
The general use of screen printing glass glaze, market supply. Special glass glaze, such as special color glaze, thin glassware screen printing glaze, and acid proof, frosting (grind arenaceous shape decoration) the glaze according to practice of using effect preparation on its own. Our preparation of base glaze glass screen printing ink is usually with a lead a boron system belongs to the silicon oxide of low melting point glass powder, the glass powder is commonly under the low temperature water resistance good lead oxide and boron oxide, acidic titanium oxide resistance, alkali resistance zirconium oxide, etc. Methods: use them to the preparation of glass glaze put the nature of the raw materials in the crucible in high temperature melting, and then make it into the water, broken into pieces for a quick glass glaze. Glass glaze is one of the most important performance on the glass surface temperature and thermal expansion coefficient and glass to be similar or gap not too big, according to the coefficient of expansion of printing glass products and the nature of the softening temperature, etc to consider to choose low melting point glass powder composition, proportion of silicon a lead a boron is generally by adjusting the glass of silicon a lead a boron powder percentage composition makes the melting temperature is close to or below printing softening temperature of the glass; Through the water in the glass screen printing ink base glaze add, zinc oxide, alumina, such as lithium silicate material, to improve the thermal expansion coefficient of glass glaze; Will screen printing on the glass surface pattern and text after baking process, when the pattern and text color glaze powder reaches melting state, the surface of the glass is only just beginning to soften, at this time there will be a part of the third after the melting of screen printing logo and glaze diffusion penetration to the surface of the glass products, forming a layer of thin layer, pattern and text color glaze and glass firmly welded together. High temperature (500 ~ 600 ℃) and 60 ~ 80 min roast flowers after processing pattern and text color glaze in high temperature melting on the surface of the glass is cooled and becomes smooth, bright and shiny.
Composition # 3: colorants
Glass screen printing ink stains are used in a variety of types of high temperature resistant inorganic pigments metal oxide or high-temperature metal chromium compound pigment, usually by metal oxide or its salts (become namely after heating the metal oxide) calcined at high temperature and be become. Glass screen printing ink stains generally use the following kinds: red colorant classes, cadmium red, cadmium sulphide and cadmium of pigment; Yellow stain - uranium salts, cadmium sulfide, lead chromate, etc; Cobalt blue stain - aluminate; Black stain - iridium oxide or chromic acid mixture of iron and manganese cobalt salt or salt; White coloring, tin oxide, calcium oxide, zirconium oxide, kaolin, etc; Green kind of colorant -- chrome oxide; Brown colorants, red iron oxide, manganese salt etc.
As most of the substrates of glass is transparent, and melt glass glaze once to bake bake flower also can form a transparent vitreous after processing, thus to make the screen printing with bright colors should be in glass screen printing ink stains are formulated some white paint. General inorganic metal oxide pigments or metal chromium compound paint tinting strength is lower than ordinary paint, this is determined by the properties of inorganic metal oxide, so the glass screen printing ink stains the amount of inorganic metal oxide pigments in the formulation to 20% ~ 35% to obtain satisfactory glass screen printing ink tinting strength and printing effect. In this way, the glass screen printing ink cost must be high, so we as a glass screen printing ink formulation designer, it is necessary to study in glass screen printing ink formulation to add a small amount of cover larger white coloring pigment or hue's more similar kind of paint, the color hue with the color photograph of the main body of the heat resistance paint used to profit.
Below is a brief introduction of common silicate glass products as the main substrate glass glaze used by screen printing, pad printing
Ink rough formula and preparation process. Step 1: the configuration of the oil ink. Ink oil formula unit, turpentine 40% 20% terpineol ethyl cellulose resin 2 o % 15.0% high boiling point of organic cosolvent 5.0% 5.0% of the total measurement
Preparation: accurate weighing more than matching of various materials, put in a container and stir evenly, and moderate heat until around (80 ~ 85 ℃), after waiting for dissolve resin with ethyl cellulose cooling and the filter, use turpentine with high boiling point class
Machine cosolvent blended to stick, qualified after the barrel. The second step: glass glaze glaze preparation.
Glass glaze formula units, the mass fraction 50% alumina 10% boron oxide resistance to acid alkali resistance titanium oxide 15% zirconia l5 % low melting silicate 10% 100% of the total measurement
Preparation: the above the raw material for glass glaze formulation of large crucible in high temperature melt (5 o0 ~ 600 ℃), and then make its molten liquid flows into the water, then use gravity break into shards of glass for a quick Portland glass glaze, qualified after the barrel. Glass screen printing ink preparation unit, mass fraction 52% 52% glass glaze colorant ink oil 22% alumina and zinc oxide (adjustment) expansion coefficient by 1% ~ 5% 100% of the total measurement preparation: proportional weighing, above the matching of various materials preparation, first the glass glaze, colorant and alumina and zinc oxide in a container and stir evenly, above ground to the fineness of 300 mesh, and then and make good cold printing oil mixing, mixing sticks to suitable for viscosity conditions of screen printing, after testing qualified for a quick cold glass colored glaze, can stay on the standby screen printing.