Organotin catalysts — Stannous octanoate

Stannous octanoate is a basic catalyst used in the production of polyurethane foam, room temperature curing silicone rubber, polyurethane rubber, and polyurethane coatings.

Chemically very unstable and highly susceptible to oxidation. Stannous octanoate is the abbreviation of 2:1 ethyl l hexanoic acid stannous. 2-ethyl? The reaction of 2-ethylhexanoic acid with sodium hydroxide to form 2-ethyl B. Sodium acid is then heated with stannous chloride in an inert solvent to carry out a complex decomposition reaction, the reaction pot into a small amount of antioxidant-264 can improve the tin content and stability of 2-ethylhexanoic acid.

Stannous octanoate is soluble in polyols and most organic solvents, but insoluble in alcohols and water. Stannous octanoate can be stored for 12 months, but must be stored in a dry place sealed Stannous octanoate is not toxic and corrosive, and can be used in the manufacture of medical supplies.

Ethanol is mainly used as a carbonizing agent (carbon source) and solvent in fire retardant coatings.
Polyvinyl alcohol Polyvinyl alcohol is obtained by hydrolyzing polyvinyl acetate. It is generally drunk in methanol, but also in water with a catalyst for reaction. The appearance of polyvinyl alcohol is white flocculent or granular; the structure is simple (CH: ·CH.O), the relative molecular weight is 44n, it is insoluble in cold water, but soluble in hot water. It is a high molecular polymer. The performance of polyvinyl alcohol is mainly determined by its molecular weight (ie average degree of polymerization) and the degree of alcoholysis. Polyvinyl alcohol is mainly used as a carbonizer (carbon source), flame retardant, and binder in fire retardant coatings. It also acts as a dispersant and resin modifier in fireproof coatings. There are many specifications of polyvinyl alcohol, paraffin wax emulsion msds and the quality index of a commonly used specification is now introduced.

Pentaerythritol Pentaerythritol is a tetrahydric alcohol containing 4 primary hydroxyl groups, white crystals, structural formula C(CHg OH), molecular formula C; HyO,, pure pentaerythritol, melting point 263℃, density 1.395g/cm, boiling point (4kPa) 276 ℃, ignition point <370℃, easy to be esterified by general organics, and no reaction with ene caustic soda solution. 1g is soluble in 18mL water at 15℃, soluble in ethanol, glycerol, ethylene glycol, formamide, insoluble in acetone, Benzene, carbon tetrachloride, ether and petroleum ether, etc.

The industrial product pentaerythritol contains dimeric pentaerythritol and impurities in different degrees. The specifications of pentaerythritol are shown in Table 23-14. The industrial product pentaerythritol contains mineral impurities, which are expressed in ash content, and the ash content should not be too high. In the production process of pentaerythritol, calcium formate is often contained, a small amount can cause the alkyd resin to be turbid; sodium formate is easy to darken the color of the alkyd resin, and sodium and calcium sulfates will sink in the bottom of the kettle as small particles. There will be no adverse effects; untreated clean sulfuric acid will affect alcoholysis and form suspended particles with insolubles, which will affect the paint film made later. The presence of a small amount of dimeric pentaerythritol reduces the melting point of pentaerythritol, the alcoholysis is slightly faster, and the viscosity rises slightly during esterification, which has no significant effect on the properties of the finished product.