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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...

Waterborne polyurethane, abbreviated as WPU, is a polymer compound based on polyurethane. It is typically defined as a high molecular weight compound with repeating urethane functional groups (NHCOO) on the main chain of the polymer. The structure of waterborne polyurethane is represented as CO—NH—R—NH—CO—O—R—O. It is commonly synthesized through the step-growth polymerization reaction of diisocyanates or polyisocyanates with compounds containing two or more active hydrogen groups. Besides urethane groups, other functional groups such as urea and biuret can also be generated during the synthesis. Therefore, in general, waterborne polyurethane is the addition product of isocyanates. Depending on the number of functional groups in the reactants, waterborne polyurethane can be synthesized into linear or branched structures, resulting in different properties and applications of the obtained waterborne polyurethane emulsions. Characteristics of Waterborne Polyurethane: 1. High elasticity and cost-effectiveness. 2. Easy to use and modify. 3. Safe, non-toxic, non-flammable, with strong adhesion. 4. Resistant to high and low temperatures, and easy to store. Applications of Waterborne Polyurethane: 1. Textile industry: Waterborne polyurethane is used as a coating to improve fabric performance, such as dye depth, colorfastness, abrasion resistance, wrinkle resistance, resilience, water resistance, heat resistance, and washability. 2. Automotive industry: Waterborne polyurethane coatings are widely used in automotive body parts, interior and exterior components, coatings for various plastic parts, automotive paints for surface finishing, and touch-up paints. They significantly reduce VOC emissions. 3. Wood industry: Waterborne polyurethane coatings are commonly used for wood finishes. They provide excellent flexibility, wear resistance, low-temperature film formation, and good fullness, without tackiness. 4. Construction industry: Waterborne polyurethane coatings have potential applications in the field of architectural coatings, especially when blended with acrylic emulsions. They can meet the requirements of elasticity, stain resistance, weather resistance, and cost-effectiveness for architectural coatings. 5. Coating industry: Conventional waterborne polyurethane coatings are flammable in the air and have limited water resistance, which restricts their application areas. Extensive research has been conducted to develop specialty waterborne polyurethane coatings, such as flame-retardant coatings, corrosion-resistant coatings, waterproof coatings, and mold-resistant coatings, expanding their application range. 6. In addition to the abovementioned functional waterborne polyurethane coatings, researchers have developed waterborne polyurethane coatings with additional functionalities, such as conductivity, environmental friendliness, shock absorption, biodegradability, and self-healing properties. Waterborne Polyurethane Adhesives: Waterborne polyurethane adh...

Self-matting polyurethane resin is an advanced material typically used in various surface coating applications. This type of resin reduces the glossiness of surfaces, offering a matte effect that many consumers prefer as it can diminish glare and reflections, providing a softer, more elegant appearance. Here are some main applications and advantages of self-matting polyurethane resin: Applications: Wood and furniture: Using self-matting polyurethane resin on wooden furniture and decor enhances their aesthetic appeal while protecting the wood from moisture and everyday wear and tear. Plastics and vinyl: Application on plastic parts improves the tactile feel and reduces the common glare found on plastic surfaces. Automotive interiors: Used for vehicle interior parts to provide a durable and easy-to-clean surface. Floor coatings: Offering a wear-resistant and slip-resistant surface for both commercial and residential flooring. Textiles: Acting as a fabric finish to give textiles a soft hand feel and matte appearance. Advantages: Eco-friendly: Modern self-matting polyurethane resins are often free from harmful solvents and components, making them environmentally friendly. Durability: These resins provide a robust protective layer that is resistant to scratches, chemicals, and UV exposure. Aesthetically pleasing: They offer a uniform matte effect without the need for additional matting agents or wax powders. Easy to clean and maintain: The coated surfaces usually have anti-smudge properties, making them easy to clean. Comfortable touch: They improve the hand feel, making the surface feel more natural and comfortable when touched. Vibrant colors: They are able to better present the natural color of the substrate, making the colors appear fuller and more vivid. Self-healing capabilities: Some advanced self-matting polyurethane resins possess self-healing features capable of repairing minor scratches.

1. Pure Water Evaporation Water evaporation refers to the process of liquid water turning into gaseous form, which occurs at non-boiling states and is a type of surface evaporation where water molecules escape from the liquid surface into the surrounding air space. The latent heat of water evaporation is defined as the energy required for water molecules to evaporate from the liquid state into the air (J/g).Water evaporation has two characteristics: The latent heat of water evaporation is particularly high, reaching 2260 J/g. Compared to organic solvents like toluene, which have a close boiling point but only require 367 J/g to evaporate, water needs over six times more energy to evaporate. During water evaporation, there is already water vapor present in the atmosphere, creating an existing water vapor pressure that affects the rate of water evaporation. When the external water vapor pressure is saturated, water evaporation will cease. 2. Water Evaporation in Aqueous Dispersions Vanderhoff et al. (1973) discovered that the moisture evaporation in emulsion gels can be divided into three stages: an initial constant rate period followed by a decelerating period and finally a gradual progression to a slow evaporation phase with zero velocity. A "skinning" phenomenon occurs.Croll et al. (1986) found that some emulsion drying only involves two stages: a constant rate period and a slow rate period, without any skinning.Both three-stage and two-stage drying phenomena exist in the drying process of dispersions, with the key difference being whether a "skin" forms on the surface during drying. 3. Vertical and Horizontal Drying In the drying process of dispersions, since moisture can only evaporate from the surface, the evaporation will inevitably cause certain areas to concentrate unevenly.Experiments on emulsion drying have found that particles distribute unevenly during drying, appearing both vertically and horizontally.Uneven phenomena occurring in the vertical direction are known as vertical drying.Uneven phenomena occurring in the horizontal direction are known as horizontal drying. 4. The Effects of Vertical and Horizontal Drying Vertical drying is an inevitable phenomenon in emulsion drying: As water evaporates from the surface, particles in the emulsion surface become concentrated. Alongside particle concentration on the surface, there is a trend for particles to diffuse from high to low concentrations, hence two competing timescales emerge during drying: the drying time tevap of an emulsion film with wet thickness H, and the time tdiff required for surface particles to diffuse to the substrate. If particles tend to stay concentrated on the surface (tevap < tdiff), then a skinning phenomenon occurs—characteristic of the three-stage drying phenomenon; If particles tend to diffuse towards the substrate (tdiff < tevap), then a basic uniform concentration is maintained without skinning—characteristic of the two-stage drying phenomenon. The facto...