It is understood that: Sorbitol (sorbitol) is a white hygroscopic powder or crystalline powder, flakes or granules, odorless. Depending on the crystallization conditions, the melting point changes in the range of 88 to 102°C, and the relative density is about 1.49. Easily soluble in water (1g dissolves in about 0.45mL water), slightly soluble in ethanol and acetic acid. It has a refreshing sweetness, the sweetness is about half that of sucrose, and its caloric value is similar to that of sucrose. Sorbitol liquid is a clear, colorless, syrupy liquid with a sweet taste, neutral to litmus, and miscible with water, glycerin and propylene glycol.
Applications of sorbitol in the polymer industry:
Sorbitol can be used as the polyol component of alkyd resins and rosin esters. Polyoxypropylene-based derivatives of sorbitol are widely used in the manufacture of rigid polyurethane foams.
When sorbitol replaces glycerol and pentaerythritol, a quick-drying, film-forming alkyl resin can be obtained, which has better gloss adhesion and strength.
The complex of pear alcohol and various metal salts is a heat-resistant and light-resistant stabilizer for polyvinyl chloride resin.
Adding sorbitol to the collagen film can greatly increase its resistance to CO2 permeability.
Sorbitol fatty acid esters can be used as plasticizers, lubricants and anti-fogging agents for vinyl resins and other polymers.
The monolaurate of sorbitan anhydride is used as a molding agent in the suspension polymerization of vinyl chloride to control the size, specific surface and porosity of plastic particles.
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