Water-based polyurethane textile coating 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 the durabil...

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.

Waterborne Polyurethane Waterborne polyurethane uses water as the dispersion medium and has advantages such as being non-flammable, environmentally friendly, non-toxic, and safe. Compared to rubber, polyurethane has better wear resistance and resistance to cutting and tearing. Compared to metals and plastics, polyurethane's sound insulation and wear resistance properties are particularly outstanding, making it irreplaceable. It is now widely used in coatings, adhesives, synthetic leather, elastomers, building materials, textile finishing, polymer surfactants, and other fields. Sinograce Chemical offers water-based polyurethane emulsions and resins, as well as water-based polyurethane raw materials DMPA and DMBA, and water-based resins used in water-based wood coatings.  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

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...