Overview
Acid Red 2B is a synthetic azo dye belonging to the acid dye class, widely used for its vibrant red hue and compatibility with protein-based fibers. It was first developed in the early 20th century as part of the expanding synthetic dye industry. The dye is particularly valued for its ability to bond effectively with wool, silk, and nylon under acidic conditions, making it a staple in textile manufacturing. As an anionic dye, Acid Red 2B contains sulfonic acid groups that enhance its water solubility and affinity for positively charged fiber surfaces. Its chemical structure includes two azo groups (-N=N-), which are responsible for its intense color. The dye is typically supplied as a powder or granule for industrial use, with standardized formulations to ensure batch-to-batch consistency.
Physical and Chemical Properties
Acid Red 2B appears as a reddish-brown crystalline powder with a molecular weight of 509.42 g/mol. It dissolves readily in water, producing a clear red solution, and shows limited solubility in organic solvents like ethanol. The dye exhibits pH-dependent behavior, with optimal dyeing performance achieved in mildly acidic conditions (pH 4-6). Key chemical properties include its lightfastness (rated 4-5 on the Blue Wool Scale) and washfastness, which make it suitable for applications requiring durability. The dye's color intensity is temperature-sensitive, with maximum absorption at around 515 nm in aqueous solutions. Under strong alkaline conditions, the azo groups may degrade, leading to color loss, which necessitates careful pH control during application.
Main Applications
The primary use of Acid Red 2B is in the textile industry for dyeing wool, silk, and nylon fabrics. Its bright red shade and excellent fiber penetration make it ideal for producing vivid apparel, carpets, and upholstery fabrics. The dye is applied through exhaust dyeing processes, where it bonds ionically with the fiber's amino groups under acidic conditions. In the leather industry, Acid Red 2B is used for coloring finished leather products, providing uniform coloration with good rubbing fastness. The paper industry employs it for tinting specialty papers, particularly those requiring water-resistant colors. Additionally, it finds niche applications in biological staining and as a colorant for some inks and coatings where pH stability is maintained.
Safety and Storage
As an azo compound, Acid Red 2B requires careful handling to minimize occupational exposure. The powder form poses an inhalation risk, and direct skin contact may cause irritation. Appropriate personal protective equipment (PPE) including gloves, goggles, and dust masks should be worn during handling. The dye is not classified as flammable but should be stored away from strong oxidizers. Proper storage involves keeping containers tightly sealed in a cool, dry place at temperatures below 30°C. Prolonged exposure to high humidity may cause caking. The dye should be protected from direct sunlight to prevent gradual degradation. Spills should be contained with absorbent materials and disposed of according to local regulations, as the dye may be harmful to aquatic organisms.
B2B Procurement Guide
When sourcing Acid Red 2B industrially, buyers should prioritize suppliers who provide comprehensive technical data sheets (TDS) and material safety data sheets (MSDS). Key specifications to verify include dye purity (typically 95-98%), salt content, and heavy metal impurities. Batch certification with spectrophotometric analysis ensures color consistency. For textile applications, request sample quantities to test dyeing performance under your specific process conditions, including pH sensitivity and compatibility with leveling agents. Consider ordering in moisture-resistant packaging for long-distance shipments. Large-scale buyers (1+ metric tons) can negotiate prices down to approximately $8-$15/kg, while smaller quantities may command premiums. Establish supplier agreements that include quality guarantees and replacement policies for off-spec material.
Related Manufacturers
- 主营：亚硒、防腐剂、抗氧化剂、二蓝光酸性红、营养强化剂、甜味剂、酸味剂、色素色淀
- 主营：直接耐晒翠兰GL、酸性蓝、靛蓝、二氯甲烷、丙二醇、乙酸乙酯、酞青蓝、活性翠蓝、120溶剂油、酸性嫩黄、油溶苯胺黑、氯代棕榈油甲酯、乙醇、溶剂油
- 主营：聚乙二醇、聚丙二醇、叔胺、伯胺、染料中间体
- 主营：阻燃剂、拉那白、牛儿酮、酸性红18、海藻糖、热敏蓝、萘磺酸、氯菊酯、硫酸锌、催化剂、杨梅酯、檀香醚、聚醚胺、吸收剂、脂檀油、苍术素、羟钴胺、转移剂、溶剂绿、麝香酮、王浆酸、芬多精、纤维素、新戊酯、王冠醚、遮甜粉
- 主营：化学试剂、氯金酸、卡尔费休、酸性红29、乙醇、异丙醇、药用辅料、依地酸钙钠、碳酸钠、盐酸氨丁三醇、龙胆酸、枸橼酸钠、甲醇、氢氧化钠、钴锰催化剂、硫酸锰、乙腈、色谱试剂、助剂、指示剂、醋酸锰、醋酸钴、氨丁三醇、尿素、硼酸
- 主营：印染前处理助剂、染色助剂、功能整理剂、酸性红、增深硅油、无醛固色剂、高浓固色剂、渗透剂、精练酶
- 主营：黄原胶、维生素C、甘氨酸、酸性红、海藻酸钠、维生素B1、精氨酸、赖氨酸、瓜尔胶、维生素、增稠剂
- 主营：营养强化剂、抗氧化剂、增稠剂、酸性红、酶制剂、酸味剂、食用色素、粉末香精、黄原胶
- 主营：有机颜料、无机颜料、金属络合染料、酸性红52、溶剂染料
- 主营：聚乙烯亚胺、三硫代碳酸钠40%、TS-1钛硅分子筛、三甘醇二异辛酸酯3G8、六氯环三磷腈、5-甲基靛红、烷基苯磺酸酯、苯基次磷酸钠、甲巯咪唑、吡啶硫酮锌、焦磷酸哌嗪、热敏材料、油酸甲酯、曲酸
- 主营：对甲苯磺酸、黄血盐钠、黄血盐钾、二氧化硒、戊二醛、4丁炔二醇、苯甲酸、环烷酸、磺化钛氰钴、盐酸羟胺、过氧化苯甲酰、衣康酸、聚丙烯酸酯乳液、癸甲溴铵、癸甲氯铵、马日夫盐、氟硅酸镁、聚乙烯吡咯烷酮k30、磷酸三丁酯、聚六亚甲基双胍、黄丹粉、红丹粉、牛肉浸膏、HEDP
- 主营：异丙醇、苯甲醇、酸酯dbe、二丁酯、二甲苯、二辛酯、乙二醇、碳酸二甲酯、醋酸乙酯、醋酸丁酯、醋酸甲酯、醋酸正丙酯、醋酸仲丁酯、纯苯、三甲苯、四甲苯、溶剂油、正丁醇、甲醇、乙醇、三乙醇胺、磷酸、三氯乙烯
- 主营：大红4bs、颜料黄、锌铁黄、酸性红114、藏蓝d-r、颜料棕、还原绿、溶剂橙、钛铬棕、溶剂红、兰耐brn、还原黑、直接橙、硫化兰、钛铬黄、大红f2g、溶剂蓝、直接绿、棕染料、大红4be、黄棕d3g、溶剂绿、直接蓝、溶剂黑、溶剂黄、还原棕
- 主营：甘氨酸、水苏糖、阻燃剂、酸性红18、硫酸锌、硫酸锆、硫酸锂、硫酸锶、硫酸锰、铝酸锌、1680-21-3、牛磺酸、褪黑素、磷酸铁、丙酸铵、苏云金、碳酸镁、麝香酮、肉桂醛、磷酸铝、王浆酸、椰油胺、赖氨酸、增塑剂、浸膏粉、乙氧基
- 主营：优氯净、硫酸锌、封口蜡、二萘酚、戊二醛、甘露醇、水杨酸、硫酸锰、防染盐、正辛烷、牛磺酸、白僵菌、冰醋酸、铵明矾、肉桂醇、碳酸镁、肉桂醛、磷酸铝、沸石粉、硫化钠、硫化钡、硫化钙、氯化锌、黄原胶、磺酸钙