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Product

PRODUCT

Methylpropane Diol (MPO)

Methylpropane Diol (MPO, 2-methyl-1,3-propanediol, CAS: 2163-42-0, formula: C4H10O2, MW: 90.12) is one of the main products of Shanghai Haihai Xinyun International Trade Co., Ltd. It is a colorless low-viscosity liquid mainly used in unsaturated polyester resins, polyurethanes and coatings to improve flexibility and water resistance.

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Product Overview

Methylpropane diol (MPO, 2-methyl-1,3-propanediol) is a colorless, transparent, low-viscosity, low-toxicity diol. It is miscible with water and most organic solvents, has moderate reactivity, and can partially replace neopentyl glycol (NPG), making it a preferred diol for environmentally friendly resins.

Main Applications

Unsaturated Polyester Resin
MPO is an important monomer for producing unsaturated polyester resins (UPR), improving water resistance, chemical corrosion resistance and toughness, widely used in artificial stone, sanitary ware, cooling towers, automotive parts and FRP products.
Polyurethane Resin
In polyurethanes, MPO is used as a raw material for polyester polyols and polyurethane elastomers, imparting excellent flexibility, hydrolysis resistance and low-temperature performance, applied in coatings, adhesives, elastomers and synthetic leather.
Coatings and Inks
MPO-based polyester is used in high-solids coatings, powder coatings and coil coatings, improving flexibility, leveling and weather resistance of the film, and is a key component of environmentally friendly coatings.
Plasticizers and Synthetic Lubricants
Its ester derivatives serve as polymer plasticizers and synthetic lubricants, improving processability and low-temperature flexibility of plastics and rubber.
Personal Care and Specialty Chemicals
Due to low toxicity and low irritation, MPO is also used as a solvent and conditioner in personal care products, cosmetics and certain specialty chemical formulations.

Physical Properties

As a preferred diol for environmentally friendly resins, MPO offers moderate reactivity, low viscosity and good hydrolysis resistance; its main physical properties are:

Appearance
Colorless, transparent, low-viscosity liquid; miscible with water and most organic solvents.
Hydroxyl value
About 760–780 mg KOH/g, providing moderate diol reactivity for polyester and polyurethane synthesis.
Boiling point
Approximately 212–215 °C at atmospheric pressure; high-boiling and low volatility.
Density and viscosity
Density about 1.03 g/cm³ (20 °C); viscosity about 165–185 mPa·s (25 °C), easy to pump and process.
Flash point and solubility
Flash point about 129 °C (PMCC); soluble in water and common organic solvents; control moisture absorption during storage.

Safety Information

(1) Hazard overview: MPO is a low-toxicity, combustible liquid at room temperature, slightly irritating to eyes and skin; large inhalation or ingestion may cause discomfort.

(2) Storage: Store in a cool, ventilated, dry warehouse, away from fire and heat sources; keep containers sealed to prevent moisture absorption; store separately from oxidizers.

(3) First aid: After skin contact, wash with soap and plenty of water; if splashed into eyes, rinse immediately with plenty of running water and seek medical attention; if ingested, rinse mouth, drink plenty of warm water, do not induce vomiting, and seek medical attention promptly.

(4) Fire fighting: Leaks can be collected with sand or inert absorbent; extinguish with water spray, foam, dry powder or carbon dioxide; avoid direct water jets that cause splashing.

(5) Personal and environmental protection: Wear protective gloves, goggles and dust/mist masks during operation, keep ventilation; dispose of waste according to local environmental regulations and prevent entry into water bodies.