Preparation method: Usually, alcohol-soluble polyurethane resin is synthesized with polyester or polyether polyols, alicyclic diisocyanates and binary amine / binary alcohol chain extenders as the main raw materials through reactions. During the preparation process, the performance of the resin can be optimized by changing the reaction conditions and types of materials. Structural features: The molecular chain of alcohol-soluble polyurethane resin contains polar groups, such as urethane and ureido carbamate, which give it good dispersion and wetting performance for pigments. At the same time, the degree of microphase separation and hydrogen bonding will increase with the increase of the hard segment content. Performance research: Mechanical properties: With the increase of the degree of microphase separation, the mechanical properties such as tensile strength and fixed elongation strength of alcohol-soluble polyurethane resin will increase, but the elongation at break will decrease. Hydrolysis resistance and alcohol resistance: The addition of polyhydroxy compounds for end-capping can improve the hydrolysis resistance and alcohol resistance of polyester polyether polyurethane. Affinity with pigments / dyes: Alcohol-soluble polyurethane resin has a good affinity and wettability with pigments / dyes, which helps to improve the quality of ink. Film forming performance: The ink made from this resin has good film forming performance, which can ensure the quality of the printed matter. Research significance: The synthesis of high-performance alcohol-soluble polyurethane resin is of great significance for improving the quality and performance of ink, and at the same time, attention should also be paid to its environmental protection and safety. It should be noted that the above information is only a general introduction, and the specific research content and results may vary due to the experimental design and conditions of the researchers. If you are interested in the research in this field, it is recommended to consult relevant academic literature or professional personnel for more detailed and accurate information.

Film-forming polyurethane binder are commonly used in printing ink formulations to provide excellent adhesion, flexibility, and durability to the printed film. When it comes to gravure reverse printing inks, which are applied to a printing plate with recessed image areas, the ink needs to have specific properties to ensure proper transfer and adhesion to the substrate. One suitable polyurethane binder for gravure reverse printing ink is a solvent-based-component polyurethane system. This type of resin typically consists of two components: a polyol component and an isocyanate component. The polyol component contains a hydroxyl-functional polymer, such as a polyester or a polyether polyol, while the isocyanate component typically consists of an aliphatic or aromatic diisocyanate. Here are some key characteristics and advantages of film-forming polyurethane binder for gravure reverse printing ink: 1. Adhesion: Polyurethane binder exhibit excellent adhesion to various substrates, including plastic films, papers, and metals. This ensures that the printed ink adheres well to the substrate surface and resists rubbing, scratching, and peeling. 2. Flexibility: Polyurethane binder provide flexibility to the ink film, allowing it to conform to the contours of the substrate without cracking or flaking. This is particularly important for packaging materials that undergo bending, folding, or stretching. 3. Chemical resistance: Polyurethane binder offer good resistance to chemicals, solvents, and oils, ensuring that the printed image remains intact even when exposed to harsh environments or cleaning agents. 4. Gloss and transparency: Polyurethane binder can be formulated to provide a range of gloss levels, from high gloss to matte finishes. Additionally, they can offer excellent transparency, allowing printed graphics or images to be visible through the ink film. 5. Fast drying: Polyurethane binder can be formulated to have fast drying characteristics, which are essential for high-speed printing processes like gravure printing. This enables efficient production and reduces the risk of smudging or offsetting. It's worth noting that the specific formulation of a polyurethane binder for gravure reverse printing ink can vary depending on the desired properties, substrate, and printing conditions. Ink manufacturers and formulators often customize the resin composition by incorporating additives, pigments, and other performance-enhancing ingredients to meet specific application requirements. When selecting a polyurethane binder for gravure reverse printing ink, it is recommended to consult our company with solvent based and waterborne polyurethane(PU)binder for your application

Gold-mine as a Chinese PU binder manufacuter develop, produce and supply a broad range of modifying, film-forming and plasticizing thermoplastic polyurethanes for flexographic and gravure printing applications. polyurethane resins are suitable to be used in surface and laminating printing inks, and are designed to fulfill the highly demanding printer requirements of this sophisticated market The liquid flexible packaging ink is made by resin, pigment, additives and solvent. And the resin is the core of the ink, due to the PU advantage, now PU resin becomes more and more popular, especially for the retorting application. We have the plasticizer, semi-film-former and film-former PU resin for ink. They are widely used for surface printing ink and lamination ink in both flexo and gravure printing technology. With the excellent color strength and adhesion property, they can meet different requirements and applications. All our products are TOL & MEK free, and our product safety expert assures our product can meet the regulation and law around the world, including Nestlé Guidance Note, EuPia Guidline, Swiss Ordinance, also FDA, EU10/2011 and China GB9685-2016 MODIFIER PLASTICIZER PU BINDERS Thermoplastic modifier polyurethane resins are used in combination with NC resins as flexibilizers, plasticizers and adhesion promoters in printing inks to replace phthalates and other restricted substances. FILM-FORMING PU BINDERS Elastomeric polyurethane resins are of a high molecular weight and used alone or in combination with small quantities of NC as a base for printing inks. Our new-generation aliphatic and tin-free elastomeric polyurethanes are successfully used in flexographic and gravure universal laminating ink systems providing specific features such as: direct pigment gridding, excellent adhesion, low odor/solvent retention, no yellowing performance, excellent anti-blocking, heat and water resistance and high solid content.

The liquid flexible packaging ink is made by resin, pigment, additives and solvent. And the resin is the core of the ink, due to the PU advantage, now PU resin becomes more and more popular, especially for the retorting application. We have the plasticizer, semi-film-former and film-former PU resin for ink. They are widely used for surface printing ink and lamination ink in both flexo and gravure printing technology. With the excellent color strength and adhesion property, they can meet different requirements and applications. All our products are TOL & MEK free, and our product safety expert assures our product can meet the regulation and law around the world, including Nestlé Guidance Note, EuPia Guidline, Swiss Ordinance, also FDA, EU10/2011 and China GB9685-2016. The main application characteristics of non-film-forming resins and film-forming resins in printing inks are as follows: Non-Film-Forming Resins: Non-film-forming resins, such as plasticizers, are primarily used in surface printing inks in collaboration with NC (nitrocellulose) resin. These resins are polymeric plasticizers, which means they do not have issues. They offer excellent resistance to heat, oil, fat, grease, and moisture. Non-film-forming resins are softer compared to NC resin, and their hardness can be adjusted to achieve different performance characteristics. Due to their low molecular weight, these resins tend to have a sticky nature. They also exhibit excellent tolerance to alcohols, making them suitable for flexographic and gravure inks. Film-Forming Resins: Film-forming resins, such as polyurethane resins, play a crucial role as binders in printing inks. These resins provide adhesion and durability to the ink film. Polyurethane resins have the advantage of excellent compatibility with various substrates, including plastic films. They offer good chemical resistance and durability, enhancing the longevity of the printed image. Additionally, polyurethane resins can improve the gloss and color vibrancy of the ink. They form a solid film upon drying, which contributes to the ink's stability and mechanical properties. Film-forming resins are commonly used in various printing applications, including packaging, labels, and publications. In summary, while non-film-forming resins like plasticizers enhance ink properties such as flexibility and resistance, film-forming resins like polyurethane resins act as binders and provide adhesion, durability, and improved visual characteristics to printed materials. The selection of the appropriate resin type depends on the specific requirements of the printing application and desired ink performance.

Polyurethane (PU) is the abbreviation for water-based polyurethane, which is typically defined as a high-molecular-weight compound with repeating urethane (NHCOO) units on the main chain of a polymer. Its structure is represented as CO-NH-R-NH-CO-O-R-O, typically formed through the step-growth polymerization reaction between diisocyanates and compounds containing two or more active hydrogen groups. In addition to urethane groups, urea and biuret groups are also formed. In general, water-based polyurethane is an addition product of isocyanates. Depending on the number of functional groups in the reaction materials, water-based polyurethane resins can be synthesized with different linear or branched structures, resulting in different properties and applications of the obtained water-based polyurethane emulsions. Characteristics of Water-based Polyurethane: High elasticity and cost-effectiveness Easy to use and modify Safe, non-toxic, non-flammable Strong adhesion, high and low temperature resistance Easy storage and handling Applications of Water-based Polyurethane: Textile Industry: Water-based polyurethane is used as a coating on fabrics to improve their properties, such as color depth, colorfastness, abrasion resistance, wrinkle resistance, resilience, water resistance, heat resistance, and washability. Automotive Industry: Water-based polyurethane coatings are widely used in automotive body parts, interior and exterior components, including coatings for various plastic parts, automotive paints, and repair coatings. They help significantly reduce volatile organic compound (VOC) emissions. Woodworking Industry: Water-based polyurethane coatings are commonly used as wood finishes. They offer excellent flexibility, wear resistance, low-temperature film formation, and good leveling, without causing re-sticking issues. Construction Industry: Water-based polyurethane coatings have great potential in the field of architectural coatings, especially when mixed with acrylic emulsions. They meet the requirements for elasticity, stain resistance, weather resistance, and cost-effectiveness in architectural coatings. Coatings Industry: Standard water-based polyurethane coatings are flammable in air and have limited water resistance, which restricts their application. Extensive research has been conducted to develop specialized water-based polyurethane coatings with flame retardant, anti-corrosive, waterproof, and anti-mold properties, expanding their application range. Additionally, functional water-based polyurethane coatings with properties such as conductivity, environmental friendliness, shock absorption, biodegradability, and self-healing have also been developed based on specific needs. Water-based Polyurethane Adhesives: Water-based polyurethane adhesives have excellent bonding performance and the film properties can be adjusted over a wide range. They are used in a variety of substrates, including footwear, automotive interior adhesives, vacuum formin...