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The role and advantages of butyltin mercaptide as a PVC stabilizer

7月 16th, 2024 News

Butylmercaptostannane, an organotin compound, is used in polyvinyl chloride due to its excellent thermal stability and transparency. (PVC) processing plays a vital role. As a widely used thermoplastic, PVC is widely used in many industries such as construction, packaging, wires and cables due to its excellent mechanical properties and processing properties. However, PVC is susceptible to degradation due to heat and light during processing and use, resulting in performance deterioration. Therefore, adding effective stabilizers has become the key to improving the quality of PVC and extending its service life.

Stabilization mechanism of butyltin mercaptide

Butyltin mercaptide is an efficient PVC stabilizer. Its mechanism of action is mainly reflected in the following aspects:

  1. Inhibit dehydrochlorination reaction: PVC is prone to dehydrochlorination reaction at high temperatures, leading to molecular chain breakage and degradation. Butyltin mercaptide can capture free radicals and interrupt this chain reaction, thereby protecting the PVC molecular chain from damage.
  2. Eliminate unstable chlorine atoms: Unstable chlorine atoms on the PVC molecular chain are “hot spots” that trigger degradation. Butyltin mercaptide is able to react with these unstable chlorine atoms, converting them into a more stable structure, reducing the chance of chain breakage.
  3. Chelation: The thiol group in butyltin mercaptide can form a chelate with the metal ions on the PVC molecular chain, reducing the catalytic effect of the metal ions and further inhibiting the degradation reaction. .
  4. Antioxidant effect: Butyltin mercaptide can also provide antioxidant protection to prevent PVC from aging due to oxidation during processing and use.

Advantages of butyltin mercaptide

Compared with traditional lead salt or calcium zinc stabilizers, butyltin mercaptide shows the following advantages in PVC stabilizers:

  1. Thermal Stability: Butyltin mercaptide has excellent thermal stability and can provide lasting protection under the high temperature conditions of PVC processing, ensuring the processing performance and product quality of PVC products.
  2. Transparency: For transparent or translucent PVC products, tin butyl mercaptide can provide excellent transparency and will not cause fogging or discoloration like some metal soap stabilizers. .
  3. Compatibility: Tin butyl mercaptide has good compatibility with PVC and is easy to disperse in the PVC complex without affecting the surface properties and electrical properties of the product.
  4. Fluidity: Compared with other organotin stabilizers, butyltin mercaptide has better fluidity, which is beneficial to the flow of materials during PVC processing and improves processing efficiency.
  5. Synergistic effect: Tin butyl mercaptide can work synergistically with other stabilizers such as antioxidants and light stabilizers to jointly improve the overall performance of PVC.

Application cases

In rigid PVC products, such as pipes, profiles and plates, butyltin mercaptide is used as the main stabilizer or co-stabilizer, which can Significantly improves the thermal and color stability of products, especially under long-term outdoor use conditions. In addition, in soft PVC, such as films and cable insulation materials, butyltin mercaptide can also exert its excellent stabilizing effect and extend product life.

Conclusion

As a PVC stabilizer, butyltin mercaptide provides comprehensive protection for PVC products with its unique chemical structure and stabilizing mechanism, making it perform well in a wide range of industrial applications. However, considering the environmental and health effects of organotin compounds, the industry is also constantly exploring more environmentally friendly alternatives, such as calcium-zinc composite stabilizers, in order to reduce the burden on the environment while maintaining product performance.

Extended reading:

CAS:2212-32-0 – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co., LTD

N,N-Dicyclohexylmethylamine – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co ., LTD

bismuth neodecanoate/CAS 251-964-6 – Amine Catalysts (newtopchem.com)

stannous neodecanoate catalysts – Amine Catalysts (newtopchem.com)

polyurethane tertiary amine catalyst/Dabco 2039 catalyst – Amine Catalysts (newtopchem.com)

DMCHA – morpholine

N-Methylmorpholine – morpholine

Polycat 41 catalyst CAS10294-43-5 Evonik Germany – BDMAEE

Polycat DBU catalyst CAS6674-22-2 Evonik Germany – BDMAEE

Environmentally friendly substitute for dioctyltin oxide

7月 12th, 2024 News

Di-n-octyltin oxide (DOTO) is widely used in polyurethane, polycarbonate and other materials due to its efficient catalytic properties. It is widely used in the field of organic synthesis. However, in recent years, the international use of dioctyltin oxide has been increasingly restricted due to its potential bioaccumulation and potential toxicity to the environment and human health, especially its effects on the reproductive system. The EU REACH regulations and other international standards have set strict restrictions on its use. Therefore, finding environmentally friendly alternatives to dioctyltin oxide has become an urgent need in the industry.

Criteria for selecting alternatives

Ideal environmentally friendly alternatives should have the following properties:

  • Efficient catalytic activity: It can effectively catalyze related chemical reactions to ensure production efficiency.
  • Low-toxic or non-toxic: Little impact on human health and the ecological environment.
  • Biodegradability: Ability to break down in the natural environment, reducing long-term cumulative risks.
  • Cost-effectiveness: Compared with dioctyltin oxide, it has equivalent or better economic benefits.
  • Stability: Remains stable during storage and use and is not prone to deterioration.

Examples of environmentally friendly alternatives

1. Organobismuth compounds

Organobismuth compounds (such as tributylbismuth oxide) as catalysts have been considered as effective alternatives to dioctyltin oxide due to their low bioaccumulation potential and relatively low toxicity. They show good catalytic activity in the synthesis of polyurethanes and polycarbonates, and in some applications the catalytic efficiency is even higher than that of dioctyltin oxide.

2. Zinc Compounds

Zinc compounds, such as zinc acetate, are also being explored as environmentally friendly catalysts. Although their catalytic efficiency may be slightly lower than that of dioctyltin oxide, zinc compounds can still meet the needs of industrial production by optimizing reaction conditions and catalyst formulations.

3. Titanate Catalyst

Titanate catalysts, such as titanium tetrabutoxide, have high catalytic activity and good thermal stability. They have proven effective in the manufacture of polyurethane foam while reducing negative environmental impact.

4. Organic Amine Catalyst

Organic amine catalysts, such as dimethylcyclohexylamine, have gradually become alternatives to dioctyltin oxide due to their high selectivity and environmental friendliness. They can effectively promote the reaction between isocyanates and polyols in polyurethane synthesis and have less impact on the environment.

5. Solid Acid Catalyst

Solid acid catalysts, such as zeolites, silica-supported metal oxides, are being developed for various organic synthesis reactions, including the synthesis of polyurethanes, due to their high catalytic activity, recyclability, and environmental compatibility.

Research and Development

Although several environmentally friendly alternatives have been discovered and are beginning to be used in industry, the search for more efficient and environmentally friendly catalysts remains an active area of ??research. Advances in new materials science and green chemistry are expected to bring about new breakthroughs. For example, new catalysts prepared through nanotechnology or biocatalysts developed through bioengineering methods may become alternatives to dioctyltin oxide in the future.

Conclusion

With the increasing global awareness of environmental protection, research on alternatives to dioctyltin oxide has become an important topic in the fields of chemistry and materials science. Organic bismuth compounds, zinc compounds, titanate catalysts, organic amine catalysts and solid acid catalysts are currently relatively mature environmentally friendly alternatives. In the future, as scientific researchers continue to explore new catalysts, we are expected to see more efficient and environmentally friendly catalysts used in industrial production, contributing to the promotion of green chemistry and sustainable development. Continuous innovation in this field not only helps reduce pressure on the environment, but also promotes the transformation of the chemical industry into a more environmentally friendly and healthy direction.

Extended reading:

CAS:2212-32-0 – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co., LTD

N,N-Dicyclohexylmethylamine – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co ., LTD

bismuth neodecanoate/CAS 251-964-6 – Amine Catalysts (newtopchem.com)

stannous neodecanoate catalysts – Amine Catalysts (newtopchem.com)

polyurethane tertiary amine catalyst/Dabco 2039 catalyst – Amine Catalysts (newtopchem.com)

DMCHA – morpholine

N-Methylmorpholine – morpholine

Polycat 41 catalyst CAS10294-43-5 Evonik Germany – BDMAEE

Polycat DBU catalyst CAS6674-22-2 Evonik Germany – BDMAEE

Dioctyltin oxide MSDS data sheet

7月 12th, 2024 News

The MSDS (Material Safety Data Sheet) of Di-n-octyltin oxide (DOTO) is An important document that provides users with information on the health, safety, fire protection, transportation and emergency response of chemicals. Below, we will outline the key MSDS information of dioctyltin oxide based on the structure of the general MSDS. It should be noted that the actual MSDS may vary depending on suppliers and regions.

Part One: Chemicals and Corporate Identification

Chinese name of chemical: dioctyltin oxide
English name of chemical: Di-n-octyltin oxide
CAS No.?870-08-6
EINECS No.?212-791-1
Molecular formula: C16H34OSn
Molecular weight: about 361.15 g/mol

Part 2: Risk Overview

Dioctyltin oxide is a toxic chemical that may cause harm to the human body if swallowed, inhaled or in contact with the skin. Direct contact with eyes, skin and clothing should be avoided, and inhalation of vapor or dust should be avoided.

Part 3: Composition/Information Components

Main ingredient: dioctyltin oxide
Impurities: May contain trace amounts of unspecified impurities
Concentration: Purity can reach 99%

Part 4: First Aid Measures

Inhalation: Move quickly to fresh air and keep breathing smoothly. If you feel unwell, seek medical attention immediately.
Skin contact: Take off contaminated clothing immediately and rinse skin with plenty of water for at least 15 minutes. If irritation persists, seek medical attention.
Eye contact: Open your eyelids immediately, rinse with running water for at least 15 minutes, and then seek medical advice.
Swallowing: Do not induce vomiting. Rinse mouth with water immediately. Do not drink large amounts of water. Get medical attention immediately.

Part 5: Firefighting Measures

Fire-fighting methods and fire-extinguishing media: Use dry powder, carbon dioxide or foam fire extinguishers.
Fire Fighting Precautions: Wear appropriate personal protective equipment and avoid breathing fumes from combustion.

Part Six: Emergency Response to Spills

Emergency Action: Wear appropriate personal protective equipment and avoid direct contact with spilled material. Use appropriate tools to collect leakage, place in a sealed container, and dispose in accordance with local regulations.

Part 7: Handling and Storage

Operating Precautions: Operate in a well-ventilated area and avoid inhaling steam or dust. Use appropriate gloves, glasses and work clothes.
Storage Precautions: Store in a cool, dry, well-ventilated place, away from sources of fire and incompatible substances. Keep sealed.

Part 8: Exposure Controls/Personal Protection

Engineering controls: Use local exhaust or general ventilation.
Respiratory protection: Wear a dust mask when necessary.
Eye Protection: Use chemical safety glasses or a face shield.
Body protection: Wear protective clothing.
Hand protection: Wear suitable chemical-resistant gloves.

Part 9: Physical and chemical properties

Appearance and properties: white to yellow powder
pH: Not applicable
Boiling Point: Not applicable
Melting point: about 45-48°C
Solubility: Insoluble in water, soluble in some organic solvents

Part 10: Stability and Reactivity

Stability: Stable under normal conditions of storage and use.
Conditions to avoid: Strong oxidizing agents, acids, water.
Hazardous Decomposition Products: May produce toxic gases including tin oxide and carbon monoxide when burned.

Part 11: Toxicological Information

Acute toxicity: LD50 (oral in mice) may exceed 2000 mg/kg
Irritation: Mild to moderate irritation to eyes, skin and respiratory tract
Sensitization: None reported
Mutagenicity: None reported
Carcinogenicity: Not classified by IARC
Reproductive toxicity: None reported

Part 12: Ecological Information

Ecotoxicity: Toxic to aquatic life
Biodegradability: Not easily biodegradable
Non-biodegradability: Photolysis and chemical degradation may be limited

Part 13: Disposal

Dispose in accordance with local environmental regulations to avoid environmental pollution.

Part 14: Shipping Information

United Nations Number?UN No.
Packaging category: III
Dangerous Goods Number: Not applicable
Packaging Mark: Toxic

Part 15: Regulatory Information

Comply with all applicable national and international regulations.

Part 16: Other information

References: Relevant regulations, standards and research literature
Revision Date: The most recent revisionDate
Manufacturer/Supplier Information: Company name, address, phone number, and email

Please note that the above information is a general description, and the specific MSDS should contain detailed chemical safety information and new regulatory requirements. Always refer to the new MSDS document and follow all safety guidelines when handling dioctyltin oxide.

Extended reading:

CAS:2212-32-0 – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co., LTD

N,N-Dicyclohexylmethylamine – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co ., LTD

bismuth neodecanoate/CAS 251-964-6 – Amine Catalysts (newtopchem.com)

stannous neodecanoate catalysts – Amine Catalysts (newtopchem.com)

polyurethane tertiary amine catalyst/Dabco 2039 catalyst – Amine Catalysts (newtopchem.com)

DMCHA – morpholine

N-Methylmorpholine – morpholine

Polycat 41 catalyst CAS10294-43-5 Evonik Germany – BDMAEE

Polycat DBU catalyst CAS6674-22-2 Evonik Germany – BDMAEE

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