Background and Overview
The molecular structure of propylene glycol butyl ether contains ether bonds and hydroxyl groups. The former is lipophilic and can interact with hydrophobic compounds Mutually soluble, the latter is hydrophilic and can be miscible with hydrophilic compounds, so it is known as the "universal solvent". Propylene glycol butyl ether is one of the important products in the propylene glycol ether series. It is an excellent solvent and is widely used in coatings, pigments, inks, high-efficiency cleaning agents, printing, leather and electronic chemicals industries. Compared with ethylene glycol ether, the toxicity of propylene glycol ether is greatly reduced, so propylene glycol ether can effectively replace ethylene glycol ether and is accepted by more and more users.
Preparation
The propylene oxide method is Currently, methods commonly used in industry to synthesize propylene glycol butyl ether include the Willamson method and the acetal method. The latter is rarely used in actual industrialization due to various problems. At present, the synthesis of propylene glycol butyl ether by propylene oxide method is mainly studied at home and abroad from the two aspects of reactor and catalyst.
United States Dow Chemical Company has developed an insoluble phosphorus ion-containing (PR 4+ ) polymer catalyst; BP Chemicals has developed a metal perfluorosulfonic acid polymer catalyst, using To catalyze the addition reaction of propylene oxide and methanol; Li Zhisong et al. used phosphomolybdate modified Al2O3As a catalyst, using a new catalytic distillation synthesis process, is used for the synthesis of propylene glycol monobutyl ether.
2. Used to prepare a propylene glycol butyl ether composite antifreeze
Antifreeze is designed and developed for concrete construction in winter. It can accelerate the condensation and condensation of concrete under negative temperature conditions. Hardening, the strength increases significantly and does not affect the later strength development. A single antifreeze often has unsatisfactory effects. Generally, compound products are used. Propylene glycol butyl ether compound antifreeze is an antifreeze with good performance.
CN201210235468.X provides a method for batch preparation of propylene glycol butyl ether composite antifreeze Method: This agent uses propylene glycol butyl ether, urea, sodium carbonate, borax air-entraining agent, and pentaerythritol high-efficiency water-reducing agent as raw materials, uses a chemical reaction kettle as a container, and supplements it with appropriate temperature and reaction time to prepare propylene glycol butyl ether composite. Antifreeze, the raw material ratio used to produce this product is: propylene glycol butyl ether 75%-77%, urea 12%-14%, sodium carbonate 3%, borax air-entraining agent 4%, pentaerythritol high-efficiency water-reducing agent 4%. A method for preparing a propylene glycol butyl ether composite antifreeze, which is characterized by the following steps:
(1) Send the formula amount of propylene glycol butyl ether Enter the chemical reaction kettle, raise the temperature to between 38°C and 40°C, stir, add the formula amount of urea and sodium carbonate to the reaction kettle, and stir for 30 minutes.
(2) Cool to normal temperature, continue stirring, add the formula amount of borax air-entraining agent and pentaerythritol high-efficiency water-reducing agent to the reactor, and stir After 15 minutes of reaction, the stirring was stopped to obtain the finished product.
(3) When using, the propylene glycol butyl ether composite antifreeze can be mixed into the concrete at an amount of 1%.
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