Dibutyl adipate (DBA): a general-purpose, cold-resistant aliphatic plasticizer

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The 25th National \"Safety Production Month\" in 2026: Everyone should talk about safety and know how to handle emergencies; identify and eliminate potential risks and hazards. -------------------------------------------------- Read this chapter in the novel reader – go and read it, and immerse yourself in reading within the novel reader. I. Product definition: Di-butyl adipate (DBA) is a colorless and transparent oily liquid at room temperature. It is insoluble in cold water but soluble in most organic solvents such as ethanol, acetone, and mineral oil. It belongs to the category of aliphatic dicarboxylic acid esters that serve as antifreeze additives. It is produced through an esterification reaction between adipic acid and n-butanol. The purity of industrial-grade products meeting national standards is ≥99.0%. The core advantage of the product is its low viscosity at low temperatures and excellent modified cold-resistant performance ； Its inherent defects include high volatility, easy migration in rubber and plastic systems, and relatively poor durability over time; as a result, phthalate compounds are commonly used in combination with it to compensate for these shortcomings. II. Application Areas 2.1 Plastic and rubber cold-resistant plasticization: Suitable for PVC, polyvinyl butyral, EVA copolymer resins, nitrocellulose, cellulose acetate butyrate, as well as synthetic rubbers such as nitrile and neoprene; it enhances the low-temperature flexibility and oil resistance of products. It is widely used in soft PVC films, household hoses, general-purpose wire insulation materials, and artificial leather substrates ； Due to their limited durability, they are rarely used alone in long-term outdoor rubber and plastic products. 2.2 Industrial solvents: As slow-drying, environmentally friendly solvents, they are used in ink, industrial coatings, and adhesive formulations to improve the leveling of the paint film and the flexibility of the final product; they are common auxiliary materials in nitrocoating systems. 2.3 Organic synthesis intermediates are primarily prepared via catalytic hydrogenation to produce 1,6-hexanediol; they are also used as raw materials for the synthesis of pharmaceuticals and fragrance ingredients in the cosmetics industry, and in small quantities as components in industrial lubricants. III. Production Process: The raw materials are adipic acid and n-butanol; the final product is manufactured through a series of steps including catalytic esterification, washing for neutralization, vacuum distillation, and decolorization for purification. There are two industrial production approaches: 1. Traditional concentrated sulfuric acid catalysis process: This method has low raw material costs, but it involves equipment corrosion caused by strong acids, numerous by-products, and large amounts of waste acid. Under environmental regulations, older batch-type plants in China are being phased out gradually ； 2. Green solid catalytic process: Mature industrial catalysts include p-toluenesulfonic acid, ammonium ferric sulfate, phosphotungstic heteropoly acids, and strongly acidic cation exchange resins; the esterification is carried out at a temperature of 135–145°C, which results in a significant reduction in waste emissions, and a continuous closed distillation production line is used. IV. Domestic manufacturers and production capacity landscape: Domestic DBA manufacturers are concentrated in the three major fine chemical hubs of Jiangsu, Shandong, and Zhejiang. The industry consists of two types of entities: one type are large integrated chemical companies that have their own adipic acid production facilities, giving them an advantage in terms of raw material supply ； The other category consists of small and medium-sized batch production facilities that use purchased raw materials; their products are mostly distributed in the nearby areas, and the mainstream products meet a quality standard of ≥99% in accordance with national regulations. V. Product Costs and Profitability: The production cost of DBA primarily consists of the costs of two main raw materials—adipic acid and n-butanol—plus expenses related to energy consumption, labor, and environmental protection measures ； The market prices of these products fluctuate cyclically in line with the trends in crude oil and upstream monomers. Integrated manufacturers that produce their own raw materials have a significantly greater ability to withstand cost fluctuations compared to small and medium-sized enterprises that rely on purchased raw materials throughout the production process. The profit margins in this industry fluctuate in line with the price difference between raw materials and finished products at various stages of the supply chain. VI. Current market supply and demand: Environmental rectification efforts continue to phase out outdated and inefficient production capacities utilizing the sulfuric acid process. Domestically, industry capacity is increasingly concentrating in leading manufacturers with integrated production facilities, while small- and medium-sized, idle, and obsolete facilities are being phased out year by year. Domestic environmental protection regulations restricting phthalate-based plasticizers are driving a steady increase in the demand for DBA as a substitute in civilian rubber and plastic products as well as coatings ； The shift of the plastic industry overseas has led to a steady increase in the foreign trade demand for domestic products, with exports concentrated in emerging plastic-producing regions such as Southeast Asia and the Middle East. VII. Differences in the applications of DBA and DBS (dibutyl sebacate): Both belong to the category of cold-resistant ester plasticizers, but their different carbon chain lengths result in different applications. 1. DBA (dibutyl adipate): It has a shorter carbon chain, lower viscosity, and lower raw material costs; it is primarily used in general-purpose PVC products, conventional coatings and inks, as well as ordinary synthetic rubbers. It does not meet the compliance requirements for use in food or medical applications ； 2. DBS (dibutyl sebacate): It has a longer carbon chain, and its resistance to low temperatures and heat is better than that of DBA; some of its grades meet food contact standards. It is widely used in high-value applications such as food packaging films, special low-temperature cables, military additives, and gas chromatography stationary phases ； 3. Common features: Both have high volatility and insufficient durability when used alone; industrial formulations require them to be combined with phthalate-based plasticizers. VIII. Industry Development Trends 1. Process upgrades: Rising environmental standards are leading to the gradual phasing out of sulfuric acid-catalyzed processes, with continuous esterification using solid acids becoming the standard approach ； 2. Diverging demands: The civilian conventional rubber and plastic as well as coating markets are seeing steady expansion driven by the use of phthalate substitutes, while high-value sectors such as food and pharmaceuticals are occupied by DBS and polyester plasticizers, making it difficult for DBA to enter these premium markets ； 3. Industry concentration: Driven by both environmental regulations and raw material costs, small and scattered production capacities continue to withdraw, while industry resources gradually converge toward integrated leaders ； 4. Foreign trade prospects: The expansion of plastic production capacity in Southeast Asia will continue to support domestic DBA export demand in the long term