Waterborne polyurethane dispersions (PUDs) are a class of resin systems that combine environmental friendliness with high performance, and are gradually becoming a star material in industries such as coatings, adhesives, textiles, leather, and inks. So, what makes PUDs so special? What performance characteristics do they offer? And in which fields can they be applied? I. What are Waterborne Polyurethane Dispersions? Waterborne polyurethane dispersions are a type of polyurethane emulsion system that uses water as the dispersion medium.  Through mechanical dispersion or self-emulsification, polyurethane prepolymers are uniformly dispersed in water, forming stable polyurethane microparticles. Compared to traditional solvent-based PU, its biggest advantages are: ✨ Low VOC / Solvent-free ✨ Safe and environmentally friendly, low odor ✨ Suitable for applications with strict environmental requirements (such as shoe materials, leather, water-based inks, etc.) II. Core Performance Characteristics of Water-based Polyurethane Water-based PUD can balance "softness" and "toughness," offering strong design flexibility and thus possessing a set of very impressive comprehensive properties: 1. Excellent Mechanical Properties High strength, high toughness Good wear resistance Different tactile sensations from soft to rigid can be achieved through structural design 2. Good Chemical Resistance and Weather Resistance Good water resistance Oil and chemical resistance Excellent anti-yellowing ability (especially aliphatic PUD) 3. Good Film-forming Properties Fast drying speed Excellent low-temperature film formation Can be blended with a variety of resins (such as acrylic, epoxy, etc.) 4. Processing-friendly and environmentally friendly Easy to operate, suitable for a variety of construction processes Contains no or very low levels of organic solvents Also has corresponding developments in the field of food contact materials (requires compliance with regulations) III. Typical Application Areas of Water-based Polyurethane Water-based PUD has a very wide range of applications, from industrial to consumer products. 1. Leather Finishing and Synthetic Leather Improves flexibility and feel Improves wear resistance, folding resistance, and hydrolysis resistance Widely used in shoe upper leather, luggage leather, garment leather, etc. 2. Water-based Adhesives Used in shoe adhesives, furniture adhesives, packaging adhesives Effectively replaces traditional solvent-based PU adhesives Low odor, high safety, and designable heat resistance 3. Water-based Wood Coatings and Industrial Coatings Possesses excellent scratch resistance, anti-yellowing, and transparency Applied to furniture paints, metal protective coatings, wheel coatings, etc. 4. Textile Auxiliaries and Coatings Provides waterproof and breathable finishing effects Forms a scratch-resistant functional coating Commonly used in sportswear, outdoor equipment, functional fabrics, etc. 5. Water-based Inks and Varnishes Fe...

Water-based polyurethane fabric coating agents can impart a soft and full hand feel and leather-like texture to fabrics, and significantly improve the wrinkle resistance, shrinkage resistance, elasticity, and flexibility of the coated fabrics. Among them, water-based polyurethane coating agents with waterproofing properties are particularly popular with fabric manufacturers and consumers. So, how does it achieve its waterproofing effect in fabrics? The key lies in its ability to adhere tightly to the fabric surface and form a continuous and dense film. The denser this film, the more difficult it is for water molecules to penetrate; at the same time, the stronger its adhesion to the fabric, the more resistant it is to washing and less likely to peel off. This strong adhesion mainly stems from the polar groups in the water-based polyurethane structure, such as urethane bonds, urea bonds, and ionic bonds. These groups interact with the fabric surface through Coulomb forces, van der Waals forces, and hydrogen bonds. The ideal bonding state is when the adhesion between the coating agent and the fabric is greater than the cohesive force of the fabric itself, but less than the cohesive force between the coating agent molecules. The density of the film is directly related to the cohesive energy of the water-based polyurethane molecules: the greater the cohesive energy, the smaller the distance between molecules, and the more compact the resulting film structure. In addition, to achieve better waterproofing effects, the surface tension of the water-based polyurethane film is reduced as much as possible, which increases the contact angle of water droplets on the film, making them less likely to spread out, thus effectively reducing the penetration of water into the coating. Sinograce Chemical produces water-based polyurethane resins for textile applications, including polyurethane waterproof coatings and polyurethane textile resins.  Inquiries are welcome.  Room 1013, Building A5, Financial Port Center, Yangzijiang Road, Baohe District, Hefei City， Anhui province, China  +86 0551 63459511 sales@sinogracechem.com  vivisinograce@outlook.com  +8615755193346  http://www.sinogracechem.com

Definition: Waterborne polyurethane is a new type of polyurethane system that uses water instead of organic solvents as a dispersion medium. It is also known as water-dispersible polyurethane, water-based polyurethane, or aqueous polyurethane. Characteristics Classification 1 By particle size and appearance 1. Polyurethane aqueous solution (transparent appearance, particle size <0.001 micrometers); 2. Polyurethane aqueous dispersion (translucent appearance, particle size: 0.001-0.1 micrometers); 3. Polyurethane emulsion (cloudy white appearance, particle size >0.1 micrometers); Classification 2 By the charge nature of hydrophilic groups 1. Anionic waterborne polyurethane (the most important, divided into carboxylic acid type and sulfonic acid type); 2. Cationic waterborne polyurethane; 3. Non-ionic waterborne polyurethane; Classification 3 By product packaging form 1. Single-component waterborne polyurethane; 2. Two-component waterborne polyurethane; Applications of Waterborne Polyurethane in Textile Auxiliaries 01 Used as a wrinkle-resistant, anti-shrinkage finishing agent for natural fibers: In the production of textiles such as cotton and silk, commonly used natural fibers share a common characteristic: they swell when wet and shrink when dry. After these two processes, the relative positions of the natural fibers undergo significant changes, resulting in wrinkling. To avoid this phenomenon and ensure the fibers remain in place, wrinkle-resistant finishing agents are usually used. Previously, the widely used wrinkle-resistant finishing agent was dimethylol dihydroxyethylene urea resin (DMDHEV), also known as 2D resin. Although it achieved good results, it produced a large amount of formaldehyde during processing, which not only harmed the health of operators and polluted the environment but also left a certain amount of free formaldehyde residue on the fabric, posing a health risk to consumers. In this context, the textile industry needed to find a new alternative. The chemical bonds formed between the polymer film contained in waterborne polyurethane finishing agents and the fibers make the wool fibers flatter, achieving anti-shrinkage and anti-wrinkle effects. 02 Used in Fabric Coating Agents: Polyurethane-coated fabrics can be used to produce fabrics with waterproof and down-proof functions, and are resistant to water, cold, and abrasion. Furthermore, they possess excellent elasticity and a good feel. Currently, polyurethane coating agents used in textile production are mainly divided into two categories: solvent-based and water-based. The solvents used in the former mainly include toluene and DMF, exhibiting significant toxicity and flammability. In contrast, water-based polyurethane does not pollute the environment and forms a good film. When applied to the fabric surface, it forms a durable film that provides waterproofing. In addition, water vapor can diffuse through the amorphous regions of the polyurethane to the surface, giving...

The application of water-based polyurethane in condoms is of great significance.  The following are its main characteristics and advantages: Material Characteristics No Protein Allergy Risk:Water-based polyurethane does not contain the protein components found in natural latex, avoiding allergic reactions such as skin itching and redness caused by latex protein allergies. It is especially suitable for people with latex allergies. High Strength and Durability:It has high tensile strength and tear resistance, and can withstand greater pressure and tensile force, reducing the risk of breakage during use. It exhibits excellent burst volume and burst pressure performance, effectively ensuring contraception and protection. Good Thermal Conductivity: Compared with natural latex, water-based polyurethane has better thermal conductivity, allowing for faster heat transfer, giving users a more natural temperature sensation and improving the user experience. Performance Advantages Ultra-Thin Design: Advanced processes allow for extremely thin thicknesses (such as 0.02mm-0.06mm), with some products even reaching 0.01mm, providing a closer-to-skin fit and enhancing the realism and comfort of sexual activity. Soft and Skin-Friendly: Through special formulations and processing techniques, water-based polyurethane condoms have a soft and delicate feel, with moderate friction when in contact with the skin, reducing discomfort.  They also have good elasticity, quickly returning to their original shape after stretching. Water Resistance and Stability: They maintain stable performance in humid environments (such as during sexual activity), and are not easily deformed, broken, or lose their protective function due to moisture, making them suitable for various usage scenarios. Manufacturing Process Dip Molding:Typically uses a multi-dip drying process, where the water-based polyurethane emulsion is evenly coated on the mold. By controlling the number of dips, drying temperature, and time, a uniformly thick and densely structured condom film is formed, ensuring consistent product quality and performance. Composite Technology:Some products use a composite material structure (such as a composite of natural latex and water-based polyurethane), combining the advantages of both materials. This retains the softness of natural latex while utilizing the high strength and water resistance of water-based polyurethane, further improving the user experience and protective effect. Overall, water-based polyurethane condoms, with their hypoallergenic properties, ultra-thin design, high strength, and good thermal conductivity, have become an important option in modern contraception and sexual health, especially for users who are allergic to traditional latex condoms or seek a superior user experience. Sinograce Chemical produces water-based polyurethane resins used in condoms and disposable gloves. Inquiries are welcome.