{"product_id":"mse-pro-pei-25k-polyethyleneimine-25-kg-barrel","title":"MSE PRO PEI-25K Polyethyleneimine, 25 kg\/Barrel","description":"\u003ch2 class=\"text-4 mb-4\"\u003e\u003cstrong\u003eMSE PRO PEI-25K Polyethyleneimine, 25 kg\/Barrel\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3 class=\"text-4 mb-4\"\u003e\u003cstrong\u003eIntroduction\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"text-4 mb-4\"\u003e\u003cstrong\u003ePolyethylenimine (PEI)\u003c\/strong\u003e, also known as polyaziridine, is a highly cationic, water-soluble polymer with the highest cationic charge density among organic polymers. Its fundamental repeating unit consists of “two carbon atoms + one nitrogen atom,” with the molecular formula (CH\u003csub\u003e2\u003c\/sub\u003eCH\u003csub\u003e2\u003c\/sub\u003eNH)\u003csub\u003en\u003c\/sub\u003e.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePEI-25K\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a medium\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003emolecular weight 25,000\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein the Polyethyleneimine product line. It appears as a colorless or light yellow viscous liquid with a slight ammonia odor.   CAS: 9002-98-6\u003c\/p\u003e\n\u003cp class=\"text-4 mb-4\"\u003e\u003cspan class=\"font-weight-bold\"\u003ePolyethylenimine PEI-25K\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e(Branched, Mw 25000) molecule contains a high density of primary (-NH\u003csub\u003e2\u003c\/sub\u003e), secondary (-NH-), and tertiary (-N\u0026lt;) amine groups, combining polar (amine) and hydrophobic (ethylene) structures. These functional groups can interact via hydrogen bonding, ionic bonding, or covalent bonding with hydroxyl, carboxyl, carbonyl, and other reactive groups, imparting excellent adhesion, cationic properties, and chemical reactivity. PEI-25K is suitable for applications in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ecoatings\/inks, textiles, antimicrobial treatments, corrosion inhibition\u003c\/strong\u003e, and other fields.\u003c\/p\u003e\n\u003ch3 class=\"font-weight-normal text-4 mb-2 bg-color-primary text-color-light\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Adhesion \u0026amp; Adsorption:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe polar amine groups of PEI-25K (linear, branched) can bind with hydroxyl (hydrogen bonding), carboxyl (ionic bonding), and carbonyl (covalent bonding) groups, enhancing adhesion to polar substrates such as paper, films, and fibers. This makes it ideal for applications requiring improved adhesion strength, including coating tack enhancement and ink fixation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate Cationicity:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eIn aqueous systems, PEI-25K exists as a polymeric cation capable of neutralizing or adsorbing anionic substances, assisting in particle dispersion or stabilization (e.g., pigments, ceramic powders). Its cationic density is lower than high molecular weight grades (like PEI-70K), making it suitable for applications requiring moderate cationic strength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Reactivity: \u003c\/strong\u003eRich in primary and secondary amine groups, PEI-25K reacts readily with epoxies, aldehydes, isocyanates, and other functional compounds, enabling its use in coating crosslinking, aldehyde adsorption, and functional finishing (e.g., flame retardant fixation).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Drying \u0026amp; Water Resistance (Coatings\/Inks):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIn acrylic emulsion systems, PEI-25K can significantly improve coating drying speed and water resistance, enhancing film-forming performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eProperty\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eColorless or pale yellow liquid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolecular Weight\u003c\/td\u003e\n\u003ctd\u003e25,000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecific Gravity (25 °C)\u003c\/td\u003e\n\u003ctd\u003e1.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViscosity (mPa·s)\u003c\/td\u003e\n\u003ctd\u003e50,000 – 150,000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResin Content\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmine Value\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlash Point\u003c\/td\u003e\n\u003ctd\u003e260 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH\u003c\/td\u003e\n\u003ctd\u003e10 – 12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"pl-5 mb-3\"\u003e\n\u003ch2 class=\"font-weight-normal text-4 mb-2 bg-color-primary text-color-light\"\u003eApplication Areas\u003c\/h2\u003e\n\u003ch3 class=\"font-weight-bold text-3 mt-3 mb-2\"\u003e1. Paper Chemicals\u003c\/h3\u003e\n\u003cp\u003eIn the paper industry,\u003cspan\u003e \u003c\/span\u003ePEI-25K is widely used as a retention aid, drainage aid, and paper-strengthening additive. Its high-density amine groups confer strong cationic properties in aqueous systems, allowing rapid neutralization of negative charges on pulp fibers and inorganic fillers, thereby improving retention of fine fibers and fillers. Its medium molecular weight provides effective bridging, forming stable floc structures between fibers and fillers, enhancing sheet formation efficiency and dewatering. For dry strength enhancement, PEI amine groups form extensive hydrogen-bond networks with cellulose hydroxyls, improving fiber-to-fiber bonding and maintaining paper strength even under high filler load.\u003c\/p\u003e\n\u003ch3 class=\"font-weight-bold text-3 mt-3 mb-2\"\u003e2. Water and Wastewater Treatment\u003c\/h3\u003e\n\u003cp\u003ePEI-25K serves as an efficient flocculant or coagulant for various industrial wastewater systems. Its high cationic charge density allows rapid neutralization of negatively charged colloids and suspended particles, destabilizing dispersions and promoting aggregation and sedimentation. The polymer chains can form multi-point adsorption bridges between particles, generating larger, more porous flocs and improving settling and filtration performance. Additionally, amine groups chelate heavy metal ions, enabling solid-liquid separation and enhancing heavy metal removal, balancing operational efficiency and treatment effectiveness.\u003c\/p\u003e\n\u003ch3 class=\"font-weight-bold text-3 mt-3 mb-2\"\u003e3. Coatings and Inks\u003c\/h3\u003e\n\u003cp\u003eIn water-based coatings and inks, PEI-25K functions as a pigment dispersant or grinding aid. Its amine groups adsorb firmly on pigment or carbon black surfaces, modifying surface charges and improving electrostatic stability. The polymer chains create steric hindrance in the aqueous phase, preventing pigment re-agglomeration during storage or application. This combination of electrostatic and steric stabilization ensures good dispersion, rheological stability, and color uniformity at high solids or pigment loading, improving the final appearance of coatings or prints.\u003c\/p\u003e\n\u003ch3 class=\"font-weight-bold text-3 mt-3 mb-2\"\u003e4. Adhesion Promotion and Surface Bonding\u003c\/h3\u003e\n\u003cp\u003eAs an adhesion promoter, PEI-25K demonstrates excellent performance on metals and polar substrates. Its amine groups coordinate or hydrogen bond with metal oxide surfaces, forming a stable chemisorbed layer. Simultaneously, PEI chains can physically entangle or chemically react with resin components in coatings, creating molecular bridges between substrate and film-forming resin. This dual mechanism improves wetting and interfacial bonding, ensuring coating adhesion and durability under challenging conditions.\u003c\/p\u003e\n\u003ch3 class=\"font-weight-bold text-3 mt-3 mb-2\"\u003e5. Adhesives and Resin Modification\u003c\/h3\u003e\n\u003cp\u003eIn adhesives and resin systems, PEI-25K can act as a reactive component for crosslinking or as a functional modifier to enhance overall performance. Amines react with epoxy or other active groups to form crosslinked networks, increasing cohesive strength and chemical resistance. Its moderate molecular weight provides sufficient crosslinking points without over-crosslinking, maintaining toughness and balanced mechanical properties. The polar structure also improves substrate compatibility, enhancing bonding reliability.\u003c\/p\u003e\n\u003ch3 class=\"font-weight-bold text-3 mt-3 mb-2\"\u003e6. Textiles, Nonwovens, and Functional Finishing\u003c\/h3\u003e\n\u003cp\u003eIn textile and nonwoven applications, PEI-25K is used for fabric finishing, dye fixation, and functional surface treatment. Its cationic amines form stable ionic bonds with anionic dyes, improving dye fixation and wash\/rub fastness. The polymer’s hydrophilicity and moisture absorption confer water affinity and anti-static properties. These functional features make PEI-25K valuable in performance textiles and medical nonwovens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mb-3 pl-5\"\u003e\n\u003ch2 class=\"font-weight-normal text-4 mb-2 bg-color-primary text-color-light\"\u003eStorage \u0026amp; Handling Precautions\u003c\/h2\u003e\n\u003cp class=\"p-2\"\u003eRecommended Conditions: Low temperature (\u0026lt;25°C; long-term storage recommended at 4–10°C refrigeration), light-proof, dry, and sealed environment.\u003c\/p\u003e\n\u003cp class=\"p-2\"\u003eHigh-Temperature Risk: Storage above 80°C or exposure to air may cause oxidation, discoloration (darkening), surface skinning, severely degrading performance (e.g., reduced\u003cspan\u003e amine\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003evalue, weakened viscosity).\u003c\/p\u003e\n\u003cp class=\"p-2\"\u003eHygroscopicity: PEI-25K is hygroscopic and absorbs CO\u003csub\u003e2\u003c\/sub\u003e; containers must be tightly sealed to avoid contact with moist air (otherwise, salts may precipitate or the product may fail).\u003c\/p\u003e\n\u003cp class=\"p-2\"\u003e\u003cstrong\u003eMSE Supplies offers various water-based resins, please \u003ca rel=\"noopener\" href=\"https:\/\/www.msesupplies.com\/pages\/contact-us-page\" target=\"_blank\"\u003econtact us\u003c\/a\u003e to discuss your needs.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"MSE Supplies LLC","offers":[{"title":"Default Title","offer_id":41379304702010,"sku":"CM0069584","price":2036.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7785\/files\/PEI-18H_2e0a169b-e45f-41b1-a44d-e9840750bd99.png?v=1777405103","url":"https:\/\/www.msesupplies.com\/products\/mse-pro-pei-25k-polyethyleneimine-25-kg-barrel","provider":"MSE Supplies","version":"1.0","type":"link"}