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.

The differences between the three types of emulsions Did you know? The durability, environmental friendliness, and lifespan of stone-effect paint all depend on the "emulsion" it contains! What are the differences between the three common emulsions on the market: styrene-acrylic, pure acrylic, and silicone-acrylic? Afraid of choosing a cheap one that won't last, or a expensive one that's a waste of money? Today, we'll explain the differences to help you avoid common mistakes and choose the right high-quality emulsion! Styrene-acrylic emulsion: Cheap but with "obvious shortcomings," choose with caution Styrene-acrylic emulsion Styrene-acrylic emulsion is the cheapest of the three emulsions and was a common raw material for early stone-effect paints, but its disadvantages are very prominent, and it has gradually been phased out of mainstream household applications. Core characteristics: Contains benzene compounds, posing a potential toxicity risk, and has poor environmental performance; Performance: Extremely poor weather resistance and yellowing resistance; easily yellows and fades when exposed to the outdoors for a long time; "whitening" occurs when exposed to water, affecting the appearance; the paint film lacks toughness and is prone to cracking and peeling later, especially in areas with large temperature differences or high humidity; Service Life: Only 3-5 years; while seemingly saving money initially, the subsequent repair and renovation costs are higher; Applicable scenarios: Not recommended for home use! Only suitable for temporary buildings, low-budget commercial projects, and other scenarios with very low requirements for environmental protection and durability. Pure acrylic emulsion:The preferred choice for home use, safe, durable, and cost-effective! Pure acrylic emulsion Pure acrylic emulsion is currently the mainstream choice for household exterior stone-effect paint, balancing environmental friendliness and practicality, offering excellent value for money. Core Features: Non-toxic and harmless, environmentally compliant, and will not cause pollution to the human body or the environment; the paint film has high elasticity, can adapt well to minor deformations of the wall, forming an integral part with the wall structure, and has strong adhesion; Performance: Excellent resistance to acids and alkalis, aging, and frost, able to withstand harsh weather conditions such as wind, sun, rain, and snow, and is not prone to yellowing or chalking; excellent water resistance, and will not turn white when exposed to water; Service Life: Approximately 15 years, requiring no frequent maintenance under normal use, resulting in low long-term maintenance costs; Applicable Scenarios: Most household scenarios in general residential buildings (including self-built houses and exterior wall renovations of commercial buildings). Silicone Acrylic Emulsion: High-end, top-of-the-line performance with an ultra-long lifespan! Silicone acrylic emulsion is based on...