Dibutyltin Dilaurate CAS 77-58-7

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Dibutyltin dilaurate is an organic tin additive, which is soluble in benzene, toluene, carbon tetrachloride, ethyl acetate, chloroform, acetone, petroleum ether and other organic solvents and all industrial plasticizers, but insoluble in water. The high boiling point multi-purpose organic tin catalyst dibutyltin dilaurat that is circulating on the market is usually subject to special liquefaction treatment. It is a light yellow or colorless oily liquid at room temperature and a white crystal at low temperature. It can be used as a PVC plastic additive with excellent lubrication, transparency and weather resistance. Good resistance to sulfide pollution. It can be used as stabilizer in soft transparent products, efficient lubricant in hard transparent products, catalyst for cross-linking reaction of acrylate rubber and carboxyl rubber, synthesis of polyurethane foam plastic and polyester, and catalyst for room temperature vulcanized silicone rubber.

Dibutyltin dilaurate (DBTDL) is an important organotin compound with the chemical formula C ∝₂ H ₆₄ O ₄ Sn and a CAS number of 77-58-7. Its molecular weight is 631.56, and it is a light yellow or colorless oily liquid at room temperature. At low temperatures, it appears as white crystals. This compound has excellent lubricity, transparency, weather resistance, and resistance to sulfide contamination. It is soluble in organic solvents such as benzene, toluene, carbon tetrachloride, ethyl acetate, chloroform, acetone, petroleum ether, and all industrial plasticizers, but insoluble in water. Due to its unique physical and chemical properties, it has a wide range of applications in multiple industrial fields.

Polyvinyl chloride (PVC) plastic additive

 

1. Stabilizers for soft transparent products
It is a commonly used heat stabilizer in PVC soft transparent products. During the PVC processing, the chlorine atoms on the PVC molecular chain are easily released at high temperatures, forming hydrogen chloride, which in turn triggers the degradation of PVC. It can react with hydrogen chloride to generate stable tin chloride and lauric acid, thereby inhibiting the degradation of PVC and improving the thermal stability of the product. At the same time, its excellent lubricity and transparency make the surface gloss and transparency of the processed finished product excellent, without sulfurization pollution, and widely used in soft transparent products such as transparent films, pipes, and synthetic leather.

2. Lubricant for hard transparent products
In hard transparent products, it is mainly used as an efficient lubricant. During the processing of PVC hard products, due to the high rigidity and poor fluidity of molecular chains, frictional heat is easily generated, resulting in rough surfaces and decreased glossiness of the products.

 

Adding this substance can reduce the friction between PVC molecular chains, improve the flowability of the product, and make the surface of the product smoother and more transparent.

3. Synergistic effect with other stabilizers
When used in combination with metal soaps such as calcium stearate, barium stearate, or epoxy compounds, a synergistic effect can be generated, further improving the thermal stability and processing performance of PVC products. Metal soap can absorb hydrogen chloride produced by PVC degradation, while this substance can inhibit the generation of hydrogen chloride. The combined effect of the two significantly improves the thermal stability of PVC products.

Polyurethane (PU) catalyst

 

1. Polyurethane foam plastic synthesis catalyst
It is one of the commonly used catalysts in the synthesis of polyurethane foam plastics. During the synthesis of polyurethane foam, isocyanate reacts with polyols to form polyurethane chain segments, and at the same time, carbon dioxide gas is released to expand the foam. It can accelerate the reaction rate of isocyanate and polyol, increase the generation rate of foam, and improve the physical properties of foam, such as density, hardness, resilience, etc.

2. Two component polyurethane coating drying agent
In two-component polyurethane coatings, the use of a drying agent can accelerate the curing speed of the coating, improve its hardness, wear resistance, and chemical corrosion resistance. Its catalytic effect enables the coating to achieve optimal performance in a short period of time, improving construction efficiency.

 

3. Polyurethane adhesive catalyst
Dibutyltin dilaurate is also widely used in polyurethane adhesives. It can accelerate the curing reaction of the adhesive, improve the bonding strength and water resistance of the adhesive. At the same time, it can also improve the fluidity and wettability of the adhesive, allowing it to better penetrate the surface of the object being bonded and enhance the bonding effect.

4. Composite use with other catalysts
When using catalytic polyurethane reaction alone, it may lead to a decrease in the aging resistance of PU. Therefore, in practical applications, it is often used in combination with catalysts such as triethylenediamine to leverage their respective advantages and improve the overall performance of polyurethane products. For example, when combined with triethylenediamine in a ratio of 1: (2-4), it can significantly improve the tensile strength and elongation of polyurethane adhesives.

Silicone rubber curing agent

 

1. Room temperature vulcanized silicone rubber catalyst
It is one of the commonly used curing agents for room temperature vulcanized silicone rubber (RTV silicone rubber). RTV silicone rubber solidifies at room temperature through the hydrolysis and condensation reaction of silicon oxygen bonds. It can accelerate the hydrolysis and condensation reaction of silicon oxygen bonds, improve the curing speed of silicone rubber, and enhance the physical properties of silicone rubber, such as hardness, tensile strength, elongation, etc.

2. Silicone rubber sealant crosslinking agent
In acetic acid based silicone sealant, used as a crosslinking agent, it can accelerate the hydrolysis and condensation reaction between silicone groups and moisture in the air, form silicone bonds, and cure the sealant. Its catalytic effect enables the sealant to achieve optimal performance in a short period of time, improving the sealing effect.

 

At the same time, it can also improve the weather resistance and aging resistance of the sealant, extending its service life.

3. Synergistic effect with other crosslinking agents
When used in combination with crosslinking agents such as triethylamine, a synergistic effect can be generated, further improving the curing speed and performance of silicone rubber sealant. For example, when used in combination with triethylamine in a ratio of 0.2:0.1, its catalytic effect is significantly higher than that of a single catalyst, which can significantly improve the shear strength and hardness of the sealant.

Other application areas

 

1. Catalyst for crosslinking reaction of acrylic rubber and carboxyl rubber
It is also applied in the crosslinking reaction between acrylic rubber and carboxyl rubber. It can accelerate the cross-linking reaction between rubber molecular chains, improve the physical properties and aging resistance of rubber. At the same time, it can also improve the processing performance of rubber, making it easier to shape and process.

2. Polyester synthesis catalyst
In the synthesis process of polyester, it can be used as a catalyst to accelerate the esterification reaction. Its catalytic effect accelerates the synthesis speed of polyester, while improving the molecular weight and thermal stability of polyester. The application in polyester synthesis provides a more efficient and environmentally friendly catalyst choice for the production of polyester.

3. Organic synthesis catalysts
It is also widely used in organic synthesis. It can catalyze various organic reactions, such as esterification, condensation, and ring opening reactions. Its catalytic effect accelerates the speed of organic reactions, while improving the selectivity and yield of the reaction.

 

The application in organic synthesis provides powerful tools for the research and development of organic chemistry.

4. Application of Cable and Wire Industry
It can also be used as a copolymer of ethylene and silane, playing an important role in the cable industry. It can promote the progress of copolymerization reactions and improve the performance of copolymers, such as heat resistance, aging resistance, electrical properties, etc. The application in the cable industry provides a more efficient and reliable catalyst selection for the production and research and development of cable wires.

5. Anti fouling surface catalyst
It has been used as a catalyst in the scheme of covalently linking polyethylene glycol with silica to form hydrophilic anti fouling surfaces. Through catalytic reaction, dibutyltin dilaurate can promote covalent bonding between polyethylene glycol and silica, forming a surface with anti fouling properties. This anti fouling surface has broad application prospects in fields such as ships, marine platforms, and medical equipment.

In the excess Grignard reagent, the organic solvent dissolved with anhydrous stannic chloride is gradually added to promote the reaction to complete in turn.

In the synthesis reaction, Grignard reagent can react with metal halides with low electropositivity, replace the action of nucleophiles and strong bases (equivalent to a negative carbon ion), and can react with compounds with active hydrogen. Tetrabutyltin is prepared by direct reaction of tin tetrachloride and Grignard reagent. Due to the occurrence of side reaction, only the mixed product of tetrabutyltin containing multiple components can be obtained; In order to improve the purity of reactants, dilute acid solution can be used to wash the mixed products of the reaction and destroy the unreacted tin tetrachloride and Grignard reagent; At the same time, water is added to the mixed product to dissolve the generated magnesium chloride into the water phase through constant vibration, and then the oil-water phase is separated.

The organic phase obtained after separating the aqueous phase is separated by distillation or vacuum distillation to obtain tetrabutyltin product. This process can realize the transformation from inorganic tin to organic tin compounds, which is called alkylation reaction. In addition, tributyltin chloride by-products are generated during the synthesis of tetrabutyltin, and the synthesis reaction process can be described by the following two formulas.

Delayed catalyst:

Generally, the addition of DY-12 (dibutyltin dilaurate) in the system will accelerate the catalytic reaction, resulting in a short service life that will affect the product liquidity and increase the construction difficulty. DY-5508 and other catalysts can well delay the gel time of the product, provide the service life of the system, and do not affect the post curing of the product. Therefore, it is widely used in polyurethane adhesives, coatings, elastomers and other fields.

Environmental catalyst:

Due to the improvement of EU environmental protection requirements, the export of butyl tin containing products is increasingly restricted. Usually, the substitute is organic bismuth (DY-20), which can solve the problems of product solidification and environmental protection.

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