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Dibasic ester DBE
Apr 28, 2018

Commonly referred to as MDBE, methyl ester of nylon is a kind of high-boiling environmental protection solvent. DuPont named DBE, Solutia named DME, and domestically known as NME.
DBE is a mixture of three dibasic esters, commonly known as nylon methyl ester, which is composed of dimethyl succinate (succinic acid) CH3OOC(CH2)2COOCH3, dimethyl glutarate CH3OOC(CH2)3COOCH3 and Dimethyldicarbonate CH3OOC(CH2)4COOCH3 is a combination of three good environmental solvents. Because of this unique structure, it makes DBE a non-toxic, colorless, transparent liquid with a light aromatic aroma. Highly soluble, biodegradable environmentally friendly high boiling point solvents are widely used in automotive coatings, color steel coatings, can coatings, enameled wire and home appliances, furniture wood coatings and other industries.
The DBE product range includes pure succinic acid, glutaric acid, and dimethyl adipate, as well as mixtures of different proportions thereof. When produced, the dicarboxylic acid is first reacted with methanol and then separated into different fractions by distillation. product. Precise esterification and separation process control make DBE extremely low in moisture content, methanol content, color and acidity.
Chemical properties:
DBE products are very stable under normal temperature and humidity. They have the characteristics of typical ester functional groups, including saponification and hydrolysis reactions. Transesterification reactions are mainly used to convert ester products into useful plasticizers and other polyesters. product.
With the emphasis on environmental protection and safety and health, more and more laws and regulations stipulate or recommend not to use harmful solvents, such as: chlorinated solvents (trichloroethane, methyl chloride, etc.), glycol ethers, ethanol ethers Acetate solvents. The DBE product is the best substitute for these solvents, and DBE products can also fully meet the increasing demand for VOCs.
Technical indicators:
Ester content: >99%
Acid value: <0.3mgKOH/g
(methanol + water): ≤0.3%
Boiling range: 196-225°C
Physical properties:
Appearance: colorless transparent liquid, slightly bitter taste
Color (Pt-Co): <100
Average molecular weight: 159
Specific gravity d4 (subscript) 25 (superscript): 1.089
Resistance 24°C: 0.5MΩ
Freezing point: -20°C
Flash point (Teg closed): 100°C
Viscosity 25°C: 2.4 cSt
Auto-ignition temperature: 366°C
Refractive index 23°C: 1.4220
Steam pressure 20°C: 26.6Pa
Relative volatilization rate 25 °C (with butyl acetate = 1): 0.01
Surface tension 20°C: 35.6 dyne/cm
When the expansion rate is 20°C: 0.0095 %
Feature editing
1. Low toxicity, low odor, low water content, safe use, and is not a hazardous substance in the regulations.
2, excellent solubility, and polyurethane resin, acrylic resin, polyester resin, alkyd resin, epoxy resin and other good compatibility.
3. It can increase the flatness and adhesiveness of paint and reduce the defects such as pinholes, fisheyes and craters.
4, high boiling point, long distillation range, can help regulate the evaporation rate of the entire solvent system.
Divalent esters MDBE
Divalent esters MDBE
5, to promote improved flexibility and adhesion.
6, has a good leveling and improve gloss.
7, in some industrial coatings, has the effect of improving the hiding power of pigments.
8, good stability, natural storage will not produce oxidation and decomposition.
9, clean combustion steam, high combustion calorific value.
Alternative solvents: replace toxic, odor-stimulating isophorone, cyclohexanone and various high boiling ether solvents.