Overview
Anionic polyurethane emulsion is a waterborne colloidal system where polyurethane particles are stabilized by negatively charged groups (e.g., carboxylates or sulfonates). Developed as an eco-friendly alternative to solvent-based polyurethanes, it combines the performance of traditional PU with low environmental impact. Unlike cationic variants, anionic emulsions exhibit superior compatibility with pigments and fillers, making them ideal for coating formulations. They are synthesized via prepolymer dispersion method, often using dimethylolpropionic acid (DMPA) as an ionic center.
Physical and Chemical Properties
The emulsion typically has a solids content of 30–50% and pH 7–9, with particle sizes ranging 50–300 nm. Its film-forming capability arises from coalescence upon water evaporation, yielding films with tensile strength of 20–40 MPa and elongation at break exceeding 400%. Key advantages include excellent adhesion to substrates (e.g., PVC, fabrics), hydrolysis resistance, and adjustable hardness (Shore A 60–90). The anionic charges provide colloidal stability but may require pH buffers to prevent agglomeration in acidic conditions.
Main Applications
In leather finishing, it imparts soft hand feel and wet rub resistance. Textile applications include waterproof breathable coatings for sportswear and anti-pilling finishes for knit fabrics. The adhesive industry leverages its strong bonding for laminates (e.g., wood-PVC composites) and automotive interiors. Emerging uses encompass UV-curable versions for 3D printing supports and biodegradable formulations for packaging films.
Safety and Storage
Classified as non-hazardous under GHS, though uncured monomers may cause mild skin irritation. Storage tanks should incorporate slow agitators to prevent sedimentation without destabilizing the emulsion. Freeze-thaw stability varies by formulation; stabilized grades withstand −5°C to 40°C. Shelf life is typically 6–12 months. Add biocides (e.g., isothiazolinones) for microbial protection in humid climates.
B2B Procurement Guide
Industrial buyers should verify: (1) ionic content (affects stability), (2) minimum film-forming temperature (MFFT) for cure conditions, and (3) compatibility with crosslinkers (e.g., aziridines). Sample testing should assess mechanical properties after accelerated aging (e.g., 7 days at 70°C/95% RH). Bulk shipments require isotanks or PE-lined drums. Leading manufacturers include Lubrizol, Alberdingk Boley, and Siwon.
Related Manufacturers
- 主营：抗氧剂、乳化剂、苯扎氯铵、聚氨酯树脂、烷基二甲基、氢化蓖麻油、表面活性剂、双链季胺盐、聚氧乙烯醚、二丁基羟基甲苯、甘油聚氧丙烯醚、十二烷基硫酸钠、树脂、助剂
- 主营：水性哑光树脂、水性油墨树脂、印花胶浆树脂、水性聚氨酯树脂、厚板浆树脂、烫金树脂、水性pu树脂、肤感树脂、耐酒精树脂、抗刮树脂、皮革树脂、鞋材树脂、高附着力树脂、耐乙醇树脂、自消光树脂、手感树脂、硅油布树脂、高弹性树脂、脂肪族树脂、芳香族树脂、烫画树脂、热转印树脂、pet树脂、pvc树脂、bopp树脂
- 主营：快干纸、处理剂、胶黏剂、聚氨酯、灌浆料、自动机、大理石、超疏水、聚合物、密度板、胶水纸、胶水pvc、木器漆、泡沫少、固化剂、pvc塑料、消泡剂、润滑油、网格布、不开胶、定位胶、pvc薄膜、树脂感、耐酸碱、附着力
- 主营：松香、萜烯树脂、石油树脂、水性增粘乳液、水性聚氨酯、环氧树脂、丙烯酸树脂、酚醛树脂、马林酸树脂、达玛树脂、附着力促进剂、二氧化硅、丁苯橡胶、水性氯丁胶乳、水性丁苯胶、增稠剂、消泡剂、抗氧剂、水晶滴胶、AB胶、白乳胶、水性黄胶、天然乳胶、美缝剂、色浆色精
- 主营：汽车内饰专用胶、水性油墨树脂、喷墨打印、聚氨酯、水性聚氨酯树脂、水性聚氨酯乳液、水性植绒胶、真空吸塑胶、水性复合胶、汽车内饰胶、水性PU、包覆胶、通道布复合胶、静电植绒胶水
- 主营：乙酸镁、阻燃剂、热熔胶、阴离子、聚合物、锂电池、光电极、泡泡糖、氯丁胶、碳酸镉、新癸酸、补差价、稀释剂、羟乙基、氧化铝、氧化铜、甲酸钾、c/c材料、碳酸锰、玻璃粉、硬光油、防腐剂、氧化铋、防水剂、聚丙烯、增粘树
- 主营：水性聚氨酯树脂、树脂
- 主营：水性聚氨酯树脂、老化箱、非接触涂层测厚仪、表面清洁度仪