Recubrimiento textil de poliuretano a base de agua technology is widely used in the textile industry, with different coating methods suitable for different production needs and product functions. The following details five main water-based polyurethane coating methods, including their principles, advantages, and typical application areas. Dip Coating Dip coating is a basic and effective water-based polyurethane coating process. The principle involves directly immersing the fabric in a water-based polyurethane emulsion . Uniform coating is achieved by controlling the immersion time, temperature, and emulsion concentration. This method is simple, easy to operate, and particularly suitable for small-batch production or experimental research. Dip coating is often used for preliminary experiments on functional textiles, such as the development and testing of waterproof and stain-resistant coatings. Pad-Batch Process The pad-batch process is a continuous coating process, mainly including three steps: padding, drying, and heat curing. First, the fabric is immersed in a bath containing water-based polyurethane using rollers to control the liquid content; then it enters the drying stage to remove water and form a preliminary coating; finally, heat curing promotes the cross-linking of polyurethane molecules, enhancing the strength and durability of the coating. This process is highly controllable and suitable for large-scale continuous production, widely used in clothing fabrics, tents, outdoor products, and other fields. Spray Coating Spray coating utilizes atomization technology to evenly spray the water-based polyurethane emulsion onto the fabric surface, and the coating thickness is controlled by airflow. This method is suitable for fabrics with complex shapes or three-dimensional structures, providing uniform coating distribution and good coverage. Spray coating is often used in products requiring high coating uniformity, such as automotive interiors, protective clothing, and home textiles. Knife Over Roll Coating Knife over roll coating uses a doctor blade to evenly remove excess water-based polyurethane emulsion, thereby forming a coating of precise thickness on the fabric surface. This method offers extremely precise control over coating thickness and is suitable for applications requiring high precision, such as medical protective clothing and precision filtration materials in industrial textiles. Composite Modification Method To improve the performance of water-based polyurethane coatings , composite modification techniques are often employed. Blend modification enhances the weather resistance and abrasion resistance of coatings by blending water-based polyurethane with materials such as acrylates and silanes; nanocomposite technology imparts special properties to coatings by adding functional nanomaterials such as nano-titanium dioxide (for UV resistance) or nano-silver (for antibacterial properties); and crosslinking technology further improves...

Sinograce Chemical PU series is an anionic aliphatic polyester polyurethane dispersion product, a high-gloss product with a relatively hard feel. It can be used for high-gloss surface treatment of fabrics, leather, synthetic leather, etc. 1. High gloss 2. Excellent yellowing resistance 3. Excellent abrasion resistance Typical properties Appearance:                    Milky white liquid pH: 7.5-9.0 Solid content:                   40±1% Charge:                             Anionic Viscosity (25℃):               100-500cP Tensile strength (MPa):     >25 100% Modulus (MPa):       >20 Elongation (%)：               >180 *These properties represent typical results only and should not be considered as specifications.  Refer to the specific Certificate of Analysis (COA) for details. 160kg, 1000 kg Store in a cool, dry place away from light. Storage temperature should be between 5~35℃. Keep the packaging intact. This product has a shelf life of six months from the date of manufacture. Performance evaluation is recommended after six months. This product must be strictly protected from frost.  Skinning may inevitably occur during storage and transportation; therefore, it is recommended to filter the product before use and use it as soon as possible. Anhui Sinograce Chemical Co., Ltd.

Los agentes de recubrimiento de poliuretano a base de agua para tejidos pueden conferir a las telas una sensación suave y completa, con una textura similar al cuero, y mejorar significativamente la resistencia a las arrugas, la resistencia al encogimiento, la elasticidad y la flexibilidad de las telas recubiertas. Entre ellos, los agentes de recubrimiento de poliuretano a base de agua con propiedades impermeabilizantes son particularmente populares entre los fabricantes y consumidores de telas. Entonces, ¿cómo logran su efecto impermeabilizante en las telas? La clave reside en su capacidad de adherirse firmemente a la superficie del tejido y formar una película continua y densa. Cuanto más densa sea esta película, más difícil será la penetración de las moléculas de agua; al mismo tiempo, cuanto más fuerte sea su adhesión al tejido, más resistente será al lavado y menos propenso a desprenderse. This strong adhesion mainly stems from the polar groups in the water-based polyurethane structure, such as uretha ne 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

Definición: 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, givin...