Sunman offers a wide range of non-reactive polyamide resins for packaging gravure inks, flexographic inks and cold seal release lacquers. The products can be divided into the following groups: Alcohol soluble polyamide These polyamides are designed to be soluble in ethanol or a blend of alcohols, and have very good ester tolerance.  It is generally more compatible with nitrocellulose than the co-solvent or alcohol reducible types, and offer better low temperature gel resistance and recovery.  The improved compatibility with nitrocellulose allows the formulation of printing inks with high heat resistance for heat-seal applications. Co-solvent polyamide Co-solvent polyamide resin is also called Toluene soluble, Co-soluble polyamide resin or Benzene soluble polyamide resin. We can supply Toluene soluble Polyamide resin in different types, which main benefits its good stability, outstanding adhesion and water resistance, high gloss and excellent water and frozen crinkle resistance. Untreated poyamide It has excellent adhesion to untreated PE/PP, good pigment dispersion. It could be applied to printing ink which does not use nitrocellulose. M/w, it had outstanding adhesion to treated PE/PP and aluminum foil as well. as printing ink applied both to untreated and treated PE/PP, which has wide range of adaptability.

Most of Inks are composed of 20% to 40% of binders, 5% to 15% of pigments, 40% to 60% of organic solvents and 0% to 5% of additives. The binder is a binder resin, which is a component of the chain of the ink, which bonds the pigment to the material to be printed, acts as an adhesion, and makes the ink glossy. The pigment determines the type of color. The solvent dissolves the resin, adjusts the viscosity, adjusts the drying speed, and improves the wetting action on the printing material. The additive acts to improve viscosity, weather resistance, ageing resistance, and gloss. The following is a brief analysis of the difference between Surface printing ink and Reverse printing ink: Differences in printing processes The internal printing plate making process is identical to the general plate making process, but the image on the plate during surface printing plate making is a reverse image, which is a positive image after printing, while the image and text on the internal printing plate are a positive image, which is a reverse image after printing.  The printing speed of surface printing ink is slow, while the printing speed of inner printing ink is faster than that of surface printing. The printing color sequence is also different. Differences in solvents The main solvents used in surface printing inks are xylene and isopropanol.  Normally, toluene and ethyl acetate are the main solvents for ink printing.  High temperature resistant cooking ink is mainly composed of ethyl ketone and ethyl acetate. The inner printing ink solvent is suitable for high-speed printing, and the volatility of the solvent is relatively fast, with a particularly small residual amount of solvent. Currently, environmentally friendly inks use esters and alcohol solvents to dilute the ink. Difference in binders The binder for surface printing inks is mainly polyamide resin, which has good adhesion and gloss, but is not suitable for high temperature conditions, and has poor fastness when compounded (but currently we also can achieve high temperature resistance). The binder for interior printing inks is mainly chlorinated polypropylene and use NC and vinyl chloride vinyl acetate copolymer resins(VAGH resin). Differences in additives The dehydrated apples and kiwi fruit esters are often added to surface printing inks to improve adhesion, gloss, and viscosity. Various additives such as pigment dispersants, reinforcing agents, defoamers, etc. are also added to the interior printing ink. Difference in wear resistance Due to the good softness and elasticity of polyamide resin, the addition of additives improves its wear resistance and makes it more firm against external objects. The chlorinated polypropylene resin is particularly rigid and has poor wear resistance. Due to the internal printing, the requirements for wear resistance are correspondingly lower.

Acrylic resin is a resin formed by copolymerization of acrylic ester and methyl methacrylate and other olefinic monomers. By selecting different resin structures, different formulations, production processes and solvent compositions, acrylic resins of different types, different properties and different uses can be synthesized. According to different structures and film-forming mechanisms, acrylic resin can be divided into thermoplastic acrylic resin and thermosetting acrylic resin. The main absorption peak of acrylic resin synthesized by copolymerization of acrylate and methacrylate monomer is outside the range of solar spectrum, so the acrylic resin coating has excellent light resistance and outdoor aging performance. Thermoplastic acrylic resin will not be further crosslinked during film forming process, so its relative molecular weight is larger, it has good light and color retention, water resistance and chemical resistance, fast drying, convenient construction, easy to recoat and rework, and aluminum powder prepared by aluminum powder has high whiteness and good positioning. Thermoplastic acrylic resin is widely used in automobile, electrical appliances, machinery, construction and other fields. Thermosetting acrylic resin refers to a functional group in the structure, which forms a network structure by reacting with the added amino resin, epoxy resin, polyurethane and other functional groups in the coating. The molecular weight of thermosetting resin is relatively low. The thermosetting acrylic coating has excellent fullness, glossiness, hardness, solvent resistance, weather resistance, no discoloration and no yellowing when baking at high temperature. The most important application is to manufacture amino-acrylic coating with amino resin, which is widely used in automobiles, motorcycles, bicycles, coil steel and other products. According to production mode, it can be divided into: 1. lotion polymerization is the reactive polymerization of monomer, initiator and reaction solvent. Generally, the solid content of resin is 50% of the resin solution! It is a solvent resin containing about 50%, which generally reacts with the solution of benzene (toluene or xylene), ester (ethyl acetate, butyl acetate), generally single or mixed! Solid lotion acrylic resin is solvent invariant! Generally, the solvent selection and product performance are different! It usually has a certain color number! The glass transition temperature is low because the reaction is usually carried out without methyl acrylate! Solids This type of resin can have a higher solid content, up to 80%! It can be used as high solid coating, and the production is simple! However, due to the invariability of solvent, transportation is not convenient! 2. Suspension polymerization is a relatively complex production process, which is generally used to produce solid resin! Solid acrylic resin, which is usually polymerized downward with methyl acrylate! Acrylates without methyl group...