1. Basic Product Information
Full Name: Methoxy Polyethylene Glycol
Abbreviation: MPEG
CAS Number: 9004-74-4 (Universal Industrial Grade)
EINECS Number: 232-674-9
General Molecular Formula: CH3O(CH2CH2O)nH
Available Molecular Weight Model: MPEG-200, MPEG-350, MPEG-500, MPEG-750, MPEG-1000, MPEG-1500, MPEG-2000, MPEG-3000, MPEG-5000, MPEG-10000
Chemical Classification: Non-ionic monofunctional polyether polymer, single-end methyl blocked polyethylene glycol derivative
Product Feature: Only one reactive hydroxyl group, no cross-linking side reaction, high hydrophilicity, excellent compatibility, low toxicity, biodegradable, good chemical stability
2. Detailed Physical & Chemical Properties
2.1 Physical Properties
1. Appearance State: Low molecular weight (200-1000): Colorless transparent viscous liquid, odorless, pure and clear; High molecular weight (≥2000): White waxy solid, white flake or granular solid
2. Solubility: Highly soluble in water, methanol, ethanol, propylene glycol, ethyl acetate and most polar organic solvents; Insoluble in aliphatic hydrocarbon, mineral oil, benzene non-polar solvents
3. Melting Point: Positive correlation with molecular weight; MPEG1000: 25℃; MPEG2000: 48-52℃; MPEG5000: 56-60℃
4. Viscosity: Liquid viscosity increases with EO chain extension; Stable viscosity under normal construction temperature
5. pH Value: 5.0-7.0 (5% aqueous solution), neutral mild property, no corrosion to metal container
6. Colority: ≤20 Pt-Co, no impurity, no suspended substance
7. Hygroscopicity: Strong water absorption, good moisturizing and water retention performance
8. Flash Point: ≥150℃, non-flammable daily industrial chemical
2.2 Chemical Properties
1. Molecular structure: One end is inert methoxy group, the other end retains active hydroxyl group, controllable reaction activity
2. Modification performance: Can carry out esterification, acrylation, etherification, amination, carboxylation reaction to synthesize polyether functional monomers
3. Environmental stability: Stable under normal temperature sealed storage; Resistant to weak acid, weak alkali and hard water environment; No hydrolysis deterioration
4. Risk performance: Slow oxidation under high temperature and strong ultraviolet light; Incompatible with strong oxidizing agent and strong alkali chemicals
5. Biosafety: Low acute toxicity, non-carcinogenic, good biocompatibility, skin-friendly, slight irritation only for high-concentration long-term contact
3. Comprehensive Product Applications
3.1 Construction Chemical Industry (Main Application)
Special macromonomer for polycarboxylic acid high-efficiency concrete superplasticizer. After esterification reaction with acrylic acid and methacrylic acid, it is made into polycarboxylate water reducer monomer. It can disperse cement particles effectively, reduce concrete mixing water consumption, improve concrete fluidity, slump retention strength, compression resistance and anti-crack performance. Widely used in highway, bridge, high-speed railway, precast parts, commercial concrete, tunnel engineering infrastructure projects.
3.2 Daily Chemical & Cosmetic Industry
Used as non-ionic emulsifier, humectant, solubilizer, thickener and skin feel conditioner. Applied in facial cleanser, shampoo, body wash, moisturizing cream, essence, hand care products. It can increase water solubility of plant essence and essence oil, reduce formula irritation, improve product ductility, prevent cosmetic system stratification, suitable for EU cosmetic standard formula production.
3.3 Pharmaceutical & Biochemical Industry
High-purity MPEG used for drug PEGylation modification raw material, prepare mPEG-NHS, mPEG-NH2, mPEG-MAL derivatives. Modify polypeptide, protein, anti-cancer small molecule drugs, extend drug half-life, reduce human immune rejection. Also used as pharmaceutical water-soluble excipient, ointment matrix, injection solubilizer, microbial culture medium additive, protein separation precipitant.
3.4 Water-based Coating & Ink Industry
Used as wetting agent, dispersant, anti-freezing agent, leveling agent and moisturizing agent for water-based paint, water-based ink, water-based adhesive. Uniform pigment dispersion, avoid paint film shrinkage and cracking, stabilize system viscosity, improve coating adhesion and weather resistance, reduce additive foaming property.
3.5 Fine Chemical & Material Processing Industry
1. Plastic rubber additive: Internal lubricant, antistatic agent, processing modifier for PE, PP, PVC polymer materials
2. Electroplating industry: Water-soluble dispersant, brightener auxiliary for metal electroplating processing
3. Water treatment industry: Metal ion chelating dispersant, remove heavy metal impurities in industrial circulating water
4. Textile industry: Textile softener, dyeing auxiliary, improve fabric hydrophilic and anti-static property
4. Storage, Transportation & Package Specification Table
