A dialkyl dialkoxycarbonylphenylphosphonate which is useful as a resin modifier, a process for producing the same in high yield at a low cost, and a process for producing a dicarboxyphenylphosphonic acid in high yield at a low cost are described. The process for producing a dialkyl dialkoxycarbonylphenylphosphonate comprises heating and reacting a dialkoxycarbonylphenyl halide with a trialkyl phosphate in the presence of a catalyst comprising an element of group VIII of the periodic table (such as an alumina supported palladium catalyst) and hydrolyzing the obtained dialkyl dialkoxycarbonylphenylphosphonate in the presence of an acid or base to produce a dicarboxyphenylphosphonic acid.

Phenylphosphonic acid derivative and production process therefor

The invention relates to a making method of a carbon fiber housing, which comprises the following steps of: 1, drawing a thermoplastic resin impregnated carbon fiber base material in a drawing device and then stacking into a laminar structure; 2, covering a thermoplastic film on the surface of the carbon fiber base material, placing the carbon fiber base material in a hot pressing mould with a vacuumizing structure; 3, assembling the hot pressing mould and heating the hot pressing mould to reach a glass conversion temperature of thermoplastic resin or film, vacuumizing the hot pressing mould by the vacuumizing structure, continuously heating the hot pressing mould to the melting temperature of the thermoplastic resin or film and forming a product; and 4, after forming, cooling the hot pressing mould and opening the mould for taking the product out According to the making method of the carbon fiber housing, carbon fibers are impregnated in thermoplastic resin, and then drawn in a drawing device and then pressurized and heated in the hot pressing mould in the multilayer stacking mode to form the product, and thus the problems of uneven carbon fibers, and no carbon fibers on partial regions of the formed surface are effectively solved

Making method of carbon fiber housing

An apparatus to prepare a preform for fabrication includes a mandrel (10), anchoring groove (50), anchoring device (30), tensioning groove (40) and tensioning device (20). The mandrel receives the preform. The mandrel has a first mandrel end and a second mandrel end. The preform has a first preform end and a second preform end. The anchoring groove is disposed at the first mandrel end. The anchoring device is configured and located to urge the first preform end towards the anchoring groove to secure the first preform end there between. The tensioning groove is disposed between the first mandrel end and the second mandrel end. The tensioning device is configured and located to urge a portion of the preform into the tensioning groove.

Tensioning devices and methods for composite structures

A reinforced fiber base material is placed on a forming die having a concave part and fixed to the forming die by at least a pair of fixing members disposed on either side of the concave part so as to form a gap between the reinforced fiber base material and a bottom surface of the concave part of the forming die. Subsequently, the reinforced fiber base material fixed to the forming die is covered by a bag film, a forming space that is formed between the forming die and the bag film is decompressed, and a matrix resin is allowed to flow inside the decompressed forming space. The matrix resin is then hardened so as to obtain a composite material in which the reinforced fiber base material and the matrix resin are integrally formed.

Method for manufacturing composite material

An apparatus to prepare a preform for fabrication includes a mandrel, anchoring groove, anchoring device, tensioning groove, and tensioning device. The mandrel receives the preform. The mandrel has a first mandrel end and a second mandrel end. The preform has a first preform end and a second preform end. The anchoring groove is disposed at the first mandrel end. The anchoring device is configured and located to urge the first preform end towards the anchoring groove to secure the first preform end therebetween. The tensioning groove is disposed between the first mandrel end and the second mandrel end. The tensioning device is configured and located to urge a portion of the preform into the tensioning groove.

Tensioning device for composite structures

PROBLEM TO BE SOLVED: To prevent wrinkles and waves from being formed in the molding of composite material. SOLUTION: In the device and method for molding composite materials, in which prepregs 3, an upper mold plate for molding 4, an air-permeable fabric 8, and a bag film 9 are superposed successively on a lower mold plate 2 and the inside of the bag film 9 is depressurized to pressure-mold the prepregs 3 and the prepregs 3 are heated and cured in an autoclave, tension is applied to the prepregs 3 whose fibers are oriented in a specific direction by a prepreg holding device 5 comprising a tension plate 6 having an L-shaped cross section and a planar holding plate 7. COPYRIGHT: (C)1998,JPO

Device and method for molding composite material

PROBLEM TO BE SOLVED: To obtain at high yield and low cost the subject new derivative useful as eg a modifier for resins by reacting Q dialkoxycarbonylphenyl halide with a trialkyl phosphite under heating in the presence of a catalyst containing a group VIII element SOLUTION: This derivative is a new dialkoxycarbonylphenyl phosphonic acid dialkyl ester represented by formula I (R and R are each a 1-10C alkoxycarbonyl; R and R are respectively substituted at positions different from each other of a combination arbitrarily selected from the group consisting of 2- and 4-, 2- and 5-, 2- and 6-, 3- and 4- and 3- and 5- positions in the benzene ring; R is a 1-10C alkyl) and useful as eg a modifier for resins This compound is obtained by reacting a dialkoxycarbonylphenyl halide represented by formula II (X is a halogeno) with a trialkyl phosphite represented by formula III (R is a 1-10C alkyl under heating in the presence of a catalyst containing a group VIII element

Phenylphosphonic acid derivative and its production

PURPOSE: To produce the compound which is an intermediate of 4,6- diaminoresorcin in a high yield by synthesizing a 3-substituted 4,6-dinitrophenol from a 1,3-dihalo-4,6-dinitrobenzene and then hydrolyzing it in the presence of sulfuric acid. CONSTITUTION: The production of 4,6-dinitroresorcin(DNR) is carried out by reacting a 1,3-dihalo-4,6-dinitrobenzene of formula 2 (X is a halogen) in the presence of an alcohol of the formula ROH (R is an alkyl, a cycloalkyl or an aralkyl) and a base, subsequently acidifying it to synthesize a 3-substituted 4,6-dinitrophenol of formula 1 and then hydrolyzing the compound of formula 1 in the presence of sulfuric acid. As sulfuric acid used in the above synthesis, an aqueous sulfuric acid solution of ≥50wt.% sulfuric acid concentration is preferably used and the hydrolysis reaction temperature is preferably 70 to 150°C. As the base, an alkaline metal, an alkaline earth metal or their compounds are preferably used. In addition, 4,6-diaminoresorcin is synthesized by reducing 4,6-dinitroresorcin. COPYRIGHT: (C)1995,JPO

Production of 4,6-dinitroresorcin and intermediate thereof

PROBLEM TO BE SOLVED: To obtain the subject compound in high yield and high reaction volume efficiency by subjecting a specific diazonium salt to a specific treatment and reacting the treated diazonium salt with resorcinol at an industrially executable concentration. SOLUTION: The objective 4,6-bis(substituted)phenyl azoresorcinol of formula II is produced by mixing a solution of a (substituted)benzenediazonium salt of formula I (R is a halogen, a 1-5C alkyl, hydroxycarbonyl or an alkoxy; (n) is 0 or 1-5; X is Cl, Br, OSO3 O or OPO3 H2 ) with a solution or suspension of hydroxide of an alkali metal or alkaline earth metal, alkalizing the mixed liquid and finally mixing and reacting the mixed liquid with resorcinol and/or its alkali metal or alkaline earth metal salt. The amount of the hydroxide in the reaction liquid is preferably 1.1-20 equivalent based on 1 equivalent of the benzenediazonium salt. The hydroxide is preferably sodium hydroxide.

Production of 4,6-bis(substituted)phenyl azoresorcinol

PROBLEM TO BE SOLVED: To provide a process for producing 4,6-diaminoresorcinol and/or its salt without causing the quality problem in the polymerization with terephthalic acid and enabling efficient recovery of by-produced (substituted) aniline. SOLUTION: 4,6-Diaminoresorcinol and/or its salt are produced by reducing a 4,6-bis(substituted)phenylazoresorcinol of the formula (R is e.g. a halogen atom or a lower alkyl; (n) is 0 or 1-5) with hydrogen in a solvent in the presence of a noble metal catalyst. In the above process, an N-basic acid is added to a raw material solution in an amount of (2/N)×(0.25-5) times mol (based on the 4,6-bis(substituted)phenylazoresorcinol), the amount of the N-basic acid in the reaction liquid after the completion of the reducing reaction is adjusted to (2/N)×(0.55-1.0) times mol (based on the azoresorcinol) and the by-produced (substituted) aniline is separated from the system.

Production of 4,6-diaminoresorcinol and/or its salt

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