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2 results about "4-Hydroxybenzoic acid" patented technology
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4-Hydroxybenzoic acid, also known as p-hydroxybenzoic acid (PHBA), is a monohydroxybenzoic acid, a phenolic derivative of benzoic acid. It is a white crystalline solid that is slightly soluble in water and chloroform but more soluble in polar organic solvents such as alcohols and acetone. 4-Hydroxybenzoic acid is primarily known as the basis for the preparation of its esters, known as parabens, which are used as preservatives in cosmetics and some ophthalmic solutions. It is isomeric with 2-hydroxybenzoic acid, known as salicylic acid, a precursor to aspirin, and with 3-hydroxybenzoic acid.
Low-viscosity high-strength thermotropic liquid crystal polymer and preparation method thereof
The invention discloses a low-viscosity high-strength thermotropic liquid crystal polymer and a preparation method thereof, and belongs to the technical field of polymer materials. According to the invention, a part of p-hydroxybenzoic acid (HBA) monomer in a polymer main chain is replaced by 3-ethoxy-4-hydroxybenzoic acid (EHA) for copolymerization modification. EHA is taken as a raw material, the regularity of an original p-hydroxybenzoic acid chain segment is destroyed by using an ethyoxyl side chain in an EHA molecule, so that the melt viscosity is remarkably reduced, the fluidity is improved by 30% or above, and meanwhile, excellent mechanical properties and dimensional stability of the material are still kept. The modified thermotropic liquid crystal polymer has improved processability, is suitable for thin-wall and complex precise injection molding and shows enhanced toughness and impact resistance, and the notch impact strength of the thermotropic liquid crystal polymer is improved by 15-30%. The technical problems that a traditional thermotropic liquid crystal polymer is high in processing temperature, fragile in weld line and the like are effectively solved, and the obtained material is particularly suitable for the high-precision application fields of 5G connectors, miniature electronic elements, medical instrument parts and the like.
Owner:SHANDONG NON METALLIC MATERIAL RESEARCH INSTITUTE +1
A method for synthesizing 3,5-dibromo-4-hydroxycinnamic acid
PendingCN122102949AOrganic compound preparationCarboxylic acid amides preparationChemical synthesisBenzoic acid
The application relates to the technical field of chemical synthesis, and discloses a synthesis method of 3,5-dibromo-4-hydroxybenzonitrile; the synthesis method of 3,5-dibromo-4-hydroxybenzonitrile comprises the following steps: mixing p-hydroxybenzoic acid and a brominating agent in solvent I to obtain a mixture, adding an acidic reagent, carrying out reaction I, and obtaining 3,5-dibromo-4-hydroxybenzoic acid; mixing 3,5-dibromo-4-hydroxybenzoic acid and a chloride in solvent II, carrying out reaction II, and obtaining a reaction liquid containing 3,5-dibromo-4-hydroxybenzoyl chloride; adding an alkaline reagent to the reaction liquid containing 3,5-dibromo-4-hydroxybenzoyl chloride, carrying out reaction III, and obtaining 3,5-dibromo-4-hydroxybenzamide; contacting 3,5-dibromo-4-hydroxybenzamide with a dehydrating agent in solvent III, carrying out reaction IV, and obtaining 3,5-dibromo-4-hydroxybenzonitrile; the raw material p-hydroxybenzoic acid used in the application is cheap and easy to obtain, the raw material cost is low, the safety is high, the environmental protection pressure is small, and the technology is self-controllable.
Owner:浙江禾本科技股份有限公司