4,4′-Methylenedianiline (MDA) is an organic compound with the formula CH 2 (C 6 H 4 NH 2) 2. It is a colorless solid, although commercial samples can appear yellow or brown. It is produced on an industrial scale, mainly as a precursor to polyurethanes.

4,4'-Methylenedianiline (MDA) is primarily used to produce 4,4'-methylenedianline diisocyanate and other polymeric isocyanates. Acute (short-term) oral and dermal exposure to MDA causes liver damage in humans and animals. MDA can irritate the skin and eyes in humans.

4,4'-二氨基二苯甲烷又称mda，淡黄色结晶，遇光变成黑色。难溶于水，易溶于乙醇、乙醚、苯。用于胶黏剂、层压品及涂料等。也用作氢丁橡胶及胶乳的硫化促进剂，在天然橡胶、丁苯橡胶中用作噻唑促进剂和活性剂。还用作制造二异氰酸盐、聚酰胺等。

4,4'-Methylenedianiline (MDA) is primarily used to produce 4,4'-methylenedianline diisocyanate and other polymeric isocyanates. Acute (short-term) oral and dermal exposure to MDA causes liver damage in

4,4'-二氨基二苯甲烷（英語： 4,4′-Methylenedianiline ，缩写MDA）是一种二苯甲烷 衍生物，化学式为CH 2 (C 6 H 4 NH 2) 2 ，常温常压下为无色固体，工业上作为生产聚氨酯的原料 [3] 。

4,4′-Methylenedianiline (MDA), is synthesized by the reaction of formaldehyde and aniline in the presence of hydrochloric acid. It is a colorless (like an ice cube) to pale white-yellow solid with a faint amine odor (sharp odor).

2025年1月27日 · MDA is a pale brown crystalline powder with a faint aminelike odor. Exposure to air and light results in polymerization and oxidation of MDA. When heated, MDA produces toxic fumes of aniline and nitrogen oxides.

mda是一种重要的原料，常用于合成高分子材料和有机合成反应。 它可用于制备聚胺酯和聚亚胺酯等聚合物，这些聚合物在塑料、涂料和粘合剂等领域有广泛应用。

2015年2月21日 · The phenethylamine that corresponds to MDA (removing the alpha-methyl group) is 3,4-methylenedioxyphenethylamine, or homopiperonylamine, or MDPEA, or simply H in the vocabulary of the Muni-Metro world.

Synthesis of MDA free base from 3-Benzo[1,3]dioxol-5-yl-2-methyl-propionamide. Sodium hypochlorite solution (1.25 ml, 4.2%) and sodium hydroxide solution (1 ml, 5%) was added to the solid amide (0.1 g). In reflux set-up the mixture was stirred, and the heat slowly increased to 80°C and held there for 30 minutes.