What is dibutyltin dilaurate used for?
What is dibutyltin dilaurate used for?
Together with dibutyltin dioctanoate, dibutyltin dilaurate is used as a catalyst for polyurethane production from isocyanates and diols. It is also useful as a catalyst for transesterification and for the room temperature vulcanization of silicones. It is also used as a stabilizer in polyvinyl chloride.
What is the chemical formula for polyurethane?
Chemical Properties
| Appearance | Clear Solid, White Powder |
|---|---|
| CAS Number | 9009-54-5 |
| IUPAC Name | Ethylurea |
| Molar Mass | 88.109g/mol |
| Molecular Formula | C3H8N2O |
How is polyurethane synthesized?
The synthesis of flexible PU foams often involves two major steps: blowing and gelling. From the blowing reaction, carbon dioxide and urea are produced, which expand and are entrapped by the reaction mixture, while the urethane linkages are formed by reactions of the isocyanate and hydroxyl group of the polyol.
What is the monomer of polyurethane?
To start off, we make polyurethanes from two monomers, a diol and a diisocyanate. There’s a huge variation in the structures available for both types of monomers. Many of these are actually used to make polymers for a wide range of applications, from hard varnishes and furniture coatings to soft flexible foam cushions.
What is Dioctyltin Dilaurate?
Dioctyltin dilaurate is an organotin compound, also abbreviated as DOTL. Due to the special raw material base, BNT-produced Dioctyltin dilaurate is liquid even at room temperature and has a yellowish color with an oily consistency. It dissolves in organic solvents like methanol or acetone.
Does polyurethane decompose?
Polyurethane is a general term used for a class of polymers derived from the condensation of polyisocyanates and polyalcohols. Despite its xenobiotic origins, polyurethane has been found to be susceptible to biodegradation by naturally occurring microorganisms.
How long does polyurethane take to decompose?
PU foams deteriorate rapidly; visible consequences of degradation can appear after 20–30 years of natural degradation. The main visual signs of degradation are discoloration, loss of flexibility, and crumbling, which occur under influence of moisture, heat, and light.
What happens when polyurethane breaks down?
During degradation, exoenzymes from microorganisms break down complex polymers, yielding smaller molecules of short chains that are small enough to pass semi-permeable outer bacterial membranes and then to be utilized as carbon energy sources.
Why does polyurethane break down?
According to the literature microorganisms such as fungi and bacteria are involved in the degradation process of polyurethanes [18]. Generally, three types of polyurethane degradations have been identified: fungal degradation, bacterial degradation, and degradation by polyurethanase enzymes.
How long does it take polyurethane to decompose?
20–30 years
PU foams deteriorate rapidly; visible consequences of degradation can appear after 20–30 years of natural degradation. The main visual signs of degradation are discoloration, loss of flexibility, and crumbling, which occur under influence of moisture, heat, and light.
How does polyurethane break down?
According to the literature polyester degradation occurs primarily by chain scission in main chain of polymer and can be induced by enzymatic hydrolysis. Enzymes can attack on the surface poly(ε-caprolactone) segments of polyurethane, degrading them to smaller molecular units via hydrolytic attack.
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