7 results about "3-Hydroxybenzoic acid" patented technology

The invention discloses a preparation method of flame-retardant polyester-containing plastic particles, and relates to the technical field of plastic particles. The modified flame retardant is tightly combined with secondary amine groups in polyester, so that the hydrolysis resistance and mechanical strength of the plastic are improved. According to the modified flame retardant, chlorine groups of vinylphosphonic acid bis (2-chloroethyl ester) and hydroxyl groups of m-hydroxybenzoic acid protected by ester groups react under the low-temperature condition, plastic particles can be promoted to be dehydrated into carbon in the presence of phosphate groups, continuous proceeding of a chain reaction during plastic combustion is prevented, the flame retardant performance is preliminarily achieved, an aromatized structure is assisted, and the flame retardant performance is improved. The formation of a low-permeability and high-continuity carbon layer is promoted, the transmission of combustible gas and heat is prevented, and the flame-retardant effect is further enhanced; after ester groups are removed from carboxyl, the carboxyl reacts with 2, 6-dihydroxytoluene to be combined to form a benzophenone structure, the anti-ultraviolet effect is achieved, the methyl is matched, the crystallization rate of plastic particles is increased, a more compact stacking structure is formed, and therefore the mechanical strength of the plastic particles is enhanced.

The invention discloses a preparation method of flame-retardant polyester-containing plastic particles, and relates to the technical field of plastic particles. The modified flame retardant is tightly combined with secondary amine groups in polyester, so that the hydrolysis resistance and mechanical strength of the plastic are improved. According to the modified flame retardant, chlorine groups of vinylphosphonic acid bis (2-chloroethyl ester) and hydroxyl groups of m-hydroxybenzoic acid protected by ester groups react under the low-temperature condition, plastic particles can be promoted to be dehydrated into carbon in the presence of phosphate groups, continuous proceeding of a chain reaction during plastic combustion is prevented, the flame retardant performance is preliminarily achieved, an aromatized structure is assisted, and the flame retardant performance is improved. The formation of a low-permeability and high-continuity carbon layer is promoted, the transmission of combustible gas and heat is prevented, and the flame-retardant effect is further enhanced; after ester groups are removed from carboxyl, the carboxyl reacts with 2, 6-dihydroxytoluene to be combined to form a benzophenone structure, the anti-ultraviolet effect is achieved, the methyl is matched, the crystallization rate of plastic particles is increased, a more compact stacking structure is formed, and therefore the mechanical strength of the plastic particles is enhanced.

The application discloses a co-crystal of berberine hydrochloride and m-hydroxybenzoic acid and a preparation method thereof, wherein the co-crystal of berberine hydrochloride and m-hydroxybenzoic acid is formed by the berberine hydrochloride and the m-hydroxybenzoic acid in a molar ratio of 1:0.5-1.5, the co-crystal is a triclinic system, a P-1 space group, and the cell parameters are as follows: alpha / °=102.49+ / -0.2, beta / °=100.51+ / -0.2, gamma / °=117.81+ / -0.2, and Z=2. The co-crystal formed by the berberine hydrochloride and the m-hydroxybenzoic acid can significantly improve the dissolution rate and the dissolution speed of the berberine hydrochloride, the bioavailability of the berberine hydrochloride is significantly increased, the co-crystal has a good treatment effect, and is suitable for clinical application.

The objective of this invention is to provide a liquid crystal polyester resin that exhibits low dielectric constant and low dielectric loss tangent while simultaneously improving practical heat resistance and suppressing the generation of escape gases or foreign matter. The liquid crystal polyester resin based on this invention is characterized by comprising at least 90 mol% of constituent units derived from hydroxycarboxylic acids, including constituent units (A) derived from p-hydroxybenzoic acid, constituent units (B) derived from 6-hydroxy-2-naphthoic acid, and constituent units (C) derived from hydroxycarboxylic acids other than those described above (A) and (B). Constituent unit (C) is a constituent unit selected from at least one of m-hydroxybenzoic acid, 6-hydroxynicotinic acid, and 4'-hydroxy-4-biphenylcarboxylic acid. The liquid crystal polyester resin further… The step comprises at least one of a constituent unit (D) from a dicarboxylic acid and a constituent unit (E) from a diol, wherein the composition ratio (mol%) of the constituent units (A) to (E) satisfies the following conditions: 10 mol% ≤ constituent unit (A) ≤ 30 mol%, 60 mol% ≤ constituent unit (B) ≤ 80 mol%, 0.1 mol% ≤ constituent unit (C) ≤ 10 mol%, 0.1 mol% ≤ constituent unit (D) + constituent unit (E) ≤ 2.0 mol%, and the melt viscosity of the liquid crystal polyester resin measured at 350°C under a shear rate of 1000 / s is 25 Pa·s or higher.

The invention relates to a curcumin eutectic crystal as well as a preparation method and application thereof. The curcumin eutectic crystal is prepared from curcumin and polyfunctional carboxylic acid. The polyfunctional carboxylic acid comprises any one of m-hydroxybenzoic acid, protocatechuic acid or citric acid. According to the curcumin eutectic crystal disclosed by the invention, on the basis of retaining the biological activity of curcumin, the solubility of curcumin can be remarkably improved, and the antioxidant and antibacterial properties of curcumin can be synchronously enhanced, so that a medicine has a more excellent clinical application effect.

The invention discloses preparation and application of a high-performance copolyester tear-resistant and temperature-resistant composite film sealing material taking methyl m-hydroxybenzoate as a starting material, and belongs to the field of polymer synthesis and composite film materials. High-performance copolyester is obtained through transesterification and catalytic polycondensation reaction, then the high-performance copolyester, a tear-resistant modifier, an antioxidant and the like are subjected to composite processing to obtain the tear-resistant and temperature-resistant composite film sealing material, and the tear-resistant and temperature-resistant composite film sealing material is applied to temperature-resistant and tear-resistant sealing of electrical, mechanical, chemical and other equipment instruments and parts thereof.

[Problem] To provide a liquid-crystal polyester resin which has a low permittivity and a low dielectric loss tangent and which can have improved practical heat resistance and can be inhibited from outgassing or forming foreign matters or the like. [Solution] A liquid-crystal polyester resin according to the present invention contains constituent units derived from hydroxycarboxylic acids in an amount of 90 mol% or larger with respect to all the constituent units, and is characterized in that: the constituent units derived from hydroxycarboxylic acids comprise a constituent unit (A) derived from p-hydroxybenzoic acid, a constituent unit (B) derived from 6-hydroxy-2-naphthoic acid, and a constituent unit (C) derived from a hydroxycarboxylic acid which is neither the constituent unit (A) nor the constituent unit (B), the constituent unit (C) being a constituent unit derived from at least one acid selected from the group consisting of m-hydroxybenzoic acid, 6-hydroxynicotinic acid, and 4'-hydroxy-4-biphenylcarboxylic acid; the liquid-crystal polyester resin further contains a constituent unit (D) derived from a dicarboxylic acid and / or a constituent unit (E) derived from a diol; the proportions (mol%) of the constituent units (A) to (E) satisfy the requirements shown by the following formulae 10 mol%≤[constituent unit (A)]≤30 mol%, 60 mol%≤[constituent unit (B)]≤80 mol%, 0.1 mol%≤[constituent unit (C)]≤10 mol%, and 0.1 mol%≤[(constituent unit (D))+(constituent unit (E))]≤2.0 mol%; and the liquid-crystal polyester resin has a melt viscosity, as measured under the conditions of 350°C and a shear rate of 1,000 / s, of 25 Pa·s or greater.