Acrylic acid is an organic compound, a colorless liquid with a pungent odor similar to acetic acid. It is highly acidic and corrosive, soluble in water, ethanol, and ether. It has active chemical properties, easily undergoing oxidation and polymerization reactions. When reduced, it forms propionic acid and can decompose into formic acid and acetic acid when melted with alkali. When added to hydrochloric acid, it forms 2-chloropropionic acid. It is made by oxidizing propionaldehyde or hydrolyzing acrylonitrile. In industry, it is directly oxidized from propylene at high temperature and pressure.
The specific steps are: preparing a carboxyl-containing diol chain extender using diethanolamine and phthalic anhydride; reacting it with bisphenol A epoxy resin and acrylic acid to prepare epoxy-modified polyol chain extender; and adding it to the reaction system of polyurethane acrylic ester to prepare low-molecular-weight polyurethane acrylic ester modified with epoxy resin. The resulting low-molecular-weight polyurethane acrylic ester contains acrylate double bonds that can be photopolymerized and can be used as the main resin for photopolymerized ink or coating formulations. The epoxy-modified polyurethane acrylic ester has the advantages of high hardness, fast curing, and high gloss, and is inexpensive and cost-effective.
Mix a photosensitive photoinitiator with a polymer for electrospinning to prepare photosensitive nanofibers. React europium ions with acrylic acid and dibenzoylmethane to form a polymerizable rare earth organic ligand. Finally, immerse the photosensitive nanofibers in europium ion ligand solution and use photo-polymerization grafting to graft europium ion ligand onto the surface of the nanofibers to prepare fluorescent nanofibers. The prepared fluorescent nanofibers have a very large specific surface area, and the fluorescent ligand is enriched on the surface of the nanofibers, so they have a high fluorescence activity. The nanofibers prepared have high application value in the field of photosensitive materials or optical sensors.
Add 4-hydroxydibenzoyl methane and formaldehyde to a three-necked flask, heat to 95°C, and react for 2 hours. Then, heat to 150°C, reduce pressure and filter for 20 minutes, cool to 105°C, and collect the product. Pour the product into water and filter it to obtain a large molecule photoinitiator. Dissolve it in an organic solvent, add epichlorohydrin to the solvent under the catalysis of boron trifluoride, drip into the mixed solution at a reaction temperature of 0-5°C, stir for 3 hours at 70°C to remove epichlorohydrin and the solvent, dissolve the residue in a solvent, add alkali at 40 °C and react for 0.5h to remove salt and solvent. Dissolve the residue in a solvent, wash with water and dry, add acrylic acid, p-hydroxyphenyl methyl ether, and tetrabutylammonium bromide, heat for 6 hours, remove the solvent, and obtain the large molecule polymerizable photoinitiator. The photoinitiator prepared by this method has a large molecular weight, low migration, and polymerizable characteristics.
Especially, a method for preparing non-fully esterified product of pentaerythritol or dipentaerythritol and acrylic acid with high purity is provided. Overcome the shortcomings of low non-complete esterification rate and low purity of pentaerythritol or dipentaerythritol with acrylic acid in existing technologies. First, mix the solvent with pentaerythritol or dipentaerythritol and heat reflux to completely dissolve or partially dissolve pentaerythritol or dipentaerythritol. After the dissolution equilibrium is reached, add acrylic acid, catalyst, inhibitor, and water-carrying agent for reflux esterification reaction. After the reaction is completed, neutralize, decolorize, and remove the solvent and filter to obtain high-purity non-completely esterified product of pentaerythritol or dipentaerythritol with acrylic acid. This invention uses an appropriate solvent to completely dissolve or partially dissolve pentaerythritol or dipentaerythritol, so that acrylic acid is esterified with pentaerythritol or dipentaerythritol homogeneously to obtain a non-completely esterified product with high purity and good product usage performance.
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