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What is the effect of pH on the catalysis of organotin catalysts?
Edit:Nantong Yutai Chemical Products Co., Ltd.   UpDate:2019-05-30

The organotin compound is a metal organic compound formed by direct bonding of tin and carbon. There are two types of alkyl tin compounds and aromatic compounds. 10-20% of the tin production is used to synthesize organotin compounds. Organotin catalysts are commonly used in the production of polyurethanes and other products, especially in the polyurethane foam, coatings, elastomers, adhesives, resins and other industries.

1. Common organotin catalysts:

1) Dibutyltin dilaurate

A strong gel catalyst for elastomers, adhesives, sealants, coatings, rigid foams, molded foams, RIM, etc.

In general, the higher the pH value, the catalytic effect of organotin is a curve that rises first and then falls sharply. For example, in the case of monomeric polymerization as a catalyst for stannous octoate and dilauryl butyltin, they accelerate the unfavorable hydrolysis reaction under alkaline conditions of pH>7 and are stable under acidic conditions, so in the form of anhydrides, for example. Epoxy resin, PU, phenolic resin and other acid-based monomers have good effect in polymerization. They also have catalytic ability under alkaline conditions, but are more suitable for weak bases such as amine-cured epoxy resins or acrylic epoxy-modified monomers. Reference as appropriate. Extremely strong acid and alkali conditions can destroy the organotin molecular structure and inactivate it. Most organic matter (including organotin) can be dissolved by organic solvents.

Commonly used organic solvents: ethanol, styrene, perchloroethylene, trichloroethylene, ethylene glycol ether and triethanolamine.

In addition, organotin compounds can be degraded under the action of ultraviolet light. For example, tributyltin (TBT) is degraded by TiO2 catalysis and ultraviolet light, and its degradation rate is affected by the amount of catalyst, ultraviolet illuminance, pH of solution, etc.

The organotin compound is a metal organic compound formed by direct bonding of tin and carbon. Formula RnSnX4-n (n=1-4, R is an alkyl group or an aromatic group). There are two types of alkyl tin compounds and aromatic compounds. Its basic structure has a substituent, a disubstituted, a trisubstituted, and a tetrasubstituted (referring to the number of R). 10-20% of the tin production is used to synthesize organotin compounds.

There are four types of organotin catalysts: a tetrahydrocarbyltin compound (R4Sn), a trihydrocarbyltin compound (R3SnX), a dialkyltin compound (R2SnX2), and a hydrocarbyltin compound (RSnX3). In the above formula, R is a hydrocarbon group, which may be Alkyl or aryl, etc.; X is an inorganic or organic acid radical, an oxygen or a halogen element, and the like.

4. It has been successfully held for 12 sessions and has been recognized by the industry as an important platform for industry exchange procurement and business expansion.

The 17-year international and professional exhibition operation team has successfully held 12 sessions. It has been recognized by the industry as an important platform for industry exchange procurement and business expansion. It is the largest coating industry event in South China.

5, the most extensive and professional promotion

(1) Continue to carry out extensive and in-depth publicity on the most widely distributed magazines and the most influential portals in the domestic and international coatings industry. With Coatings World Germany International Polymers, Japan Coatings News, UK Pigments And resin technology, the United States "PCI", "European Polymer", China "paint industry", "Huicong Business Advertising", "Xin Xin Coatings Business", "China Coatings News", "Coating Business" and other professional magazines and Alibaba, China Titanium Dioxide Network, Titanium Dioxide Industry Network, China Chemical Network, HC Network, Xinxin Coatings Network, China Coatings Purchasing Network, Lianzhong Coatings Network, China New Coatings Network, China Coatings Online, Tuying World, Finishing Network, paint market network, global coating network and other well-known websites jointly promoted.

(2) Continue to cooperate with google (Google), the world's largest search engine, to place keyword advertisements in countries and regions such as the United Kingdom, the United States, Germany, Japan, Korea, India, Singapore, Vietnam, Hong Kong and Taiwan.

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