1,3-Butanediol is a colorless, slightly bitter-sweet viscous liquid. Melting point -77℃. Boiling point 207.5℃. Relative density 1.0043. Viscosity (25℃) 103.9mPa.s. Refractive index 1.4401. Surface tension (25℃) 37.8mN/m. It is understood that it is soluble in water, acetone, methyl-ethyl (methyl) ketone, ethanol, dibutyl phthalate, castor oil, and almost insoluble in aliphatic hydrocarbons, benzene, toluene, carbon tetrachloride, and ethanolamine Class, mineral oil, linseed oil. It dissolves nylon when heated and also partially dissolves shellac and rosin. Because of its high boiling point, it is easily oxidized by air during distillation under normal pressure, so it is better to distill under reduced pressure. Highly hygroscopic.
Themain uses of 1,3-butanediol are as follows:
1. Used as raw material for polyester resin and alkyd resin, unsaturated polyester made by mixing 1,3-butanediol or ethylene glycol has good water resistance, softness and impact resistance. .
2. Used as a raw material for plasticizers, polyester plasticizers made from 1,3-butanediol and dibasic acid (adipic acid) have low volatility and resistance to migration. Resistant to water, soapy water, solvents and oils.
3. Used as a raw material for polyurethane coatings. As a raw material for saturated polyester for polyurethane coatings, the resulting product can have good water resistance in the unpainted process and is more effective than using other glycols. good.
4. Used as a wetting agent and softener, 1,3-butanediol has excellent moisturizing properties and low toxicity. After being made into ester, it can be used as cigarettes, celluloid, vinylon film, and paper. Moisturizing and softening agent for fibers and fibers.
5. Used as a solvent for fine chemicals and can be used in the formulation of lotions, ointments, creams and toothpastes.
6.1,3-Butanediol is also an intermediate for medicines and dyes.
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