Korea Research Institute of Chemical Technology

Jae-Rock Lee

Sang-Bong Lee

Geun Ho Kwak

Mun-Han Kim

Ki-Dong Kim

Kyu-Wan Lee

Min-Seok Cho

Byung-Jae Park

Soon-Jin Park

Mi-Jeong Han

The present invention relates to a novel epoxy resin curing system comprising a cationic latent catalytic curing agent containing a hexafluoroantimonate, characterized by exhibiting no shrinkage of volume or inducing an expansion of volume during the curing reaction of the epoxy resin. By the use of the epoxy resin curing system comprising a cationic latent catalytic curing agent containing a hexafluoroantimonate, it is possible to inhibit the shrinkage of volume or to induce the expansion of volume during the curing reaction of the epoxy resin. The development of such curing systems made it possible to improve the dimensional stability and to remove the residual stress, which has caused problems for decades in the production of various molded articles. Furthermore, the curing systems according to the present invention have excellent adhesive properties, thereby making it possible to develop adhesives for accurate spatial infiltration.

Epoxy resin curing system containing latent catalytic curing agent causing the expansion of volume

The present invention relates to a novel latent curing agent which is capable of controlling the initiation reaction stage and is curable by heat and/or UV-light, an epoxy resin composition containing it, and a mixed epoxy composition (blend) having different functional groups. Particularly, it has been found that the epoxy resin composition consisting of an aliphatic type epoxy (CAE) and/or a difunctional bisphenol A type epoxy (DGEBA) has excellent mechanical properties.

Latent curing agent for epoxy resin initiated by heat and UV-light and epoxy resin composition containing the same and cured epoxy products

A polymer/liquid crystal dispersion includes a liquid crystal, a surfactant and a water soluble copolymer obtained by polymerizing a hydrophilic monomer with one or more hydrophobic monomers. The concentration of the hydrophobic monomer may be 14 to 25% by weight based on the combined weight of the hydrophobic monomer and the hydrophilic monomer. The hydrophobic monomer may be styrene, 3-(trifluoromethyl)styrene, nonylphenol, methacryloyl chloride, methacrylate, and acrylate. The hydrophilic monomer may be acrylamide, acrylonitrile or acryloyl chloride. Preferably, the hydrophilic monomer is acrylamide or a derivative thereof and the hydrophobic monomer is styrene, methyl methacrylate or vinyl acetate. The liquid crystal may be a nematic liquid crystal formed of an azomethine compound or an azo compound. The water soluble copolymer, the liquid crystal, the surfactant and water may form a liquid crystal/aqueous polymer solution. In this case, the concentration of the liquid crystal in the liquid crystal/aqueous polymer solution is preferably in the range of 50 to 70% by weight and the concentration of the surfactant is preferably in the range of 1 to 5.5% by weight. A composite film may be formed from the polymer/liquid crystal dispersion and a pair of plates sandwiching the polymer liquid crystal emulsion.

Polymer/liquid dispersion, composite film and method for producing same

A polymer liquid crystal emulsion includes a liquid crystal and a water soluble copolymer obtained by polymerizing a hydrophilic monomer with one or more hydrophobic monomers. The concentration of the hydrophobic monomer may be 14 to 25% by weight based on the combined weight of the hydrophobic monomer and the hydrophilic monomer. The hydrophobic monomer may be styrene, methyl methacrylate, vinyl acetate, acrylate or methacrylate. The hydrophilic monomer may be acrylamide, acrylonitrile or acryloylchloride. Preferably, the hydrophilic monomer is acrylamide or a derivative thereof and the hydrophobic monomer is styrene, methyl methacrylate or vinyl acetate. The liquid crystal may be a nematic liquid crystal formed of an azomethine compound or an azo compound. The water soluble copolymer, the liquid crystal and water may form a liquid crystal/aqueous polymer solution. In this case, the concentration of the liquid crystal in the liquid crystal/aqueous polymer solution is in the range of 50 to 70% by weight. A nematic curvilinear alignment phase film may be formed from the polymer liquid crystal emulsion and a pair of plates sandwiching the polymer liquid crystal emulsion.

Polymer liquid crystal emulsion stabilized by water soluble copolymer, liquid crystal composite film and method for preparing thereof

The present invention relates to a method for preparing a carbon-carbon composite. The method of the present invention comprises adding a ceramic-based oxidation inhibitor having a brittle-to-ductile transition, to thereby eliminate high densification processes via re-impregnation and re-carbonization. The present invention also relates to a carbon-carbon composite prepared thereby that comprises a ceramic powder added to a thermosetting resin.

Carbon-carbon composites containing ceramic power and method for preparing the same

Process for manufacturing functional activated carbon fibers treated by anodic oxidation

A method for preparing a high-heat-resistant-epoxy-resin composition which comprises adding, as catalytic curing agent, a quinoxalinium salt having a benzyl group to difunctional and multifunctional epoxy resin and thermoset resin having a similar structure. The epoxy-resin composition obtained by the present invention is excellent in its impregnating property, processability, impact resistance, drug resistance, electric-insulating property, and adhesiveness.

Method for preparing a high heat resistant epoxy resin composition

A method for preparing a high-heat-resistant-epoxy-resin composition which comprises adding, as catalytic curing agent, a pyrazinium salt having a benzyl group to difunctional and multifunctional epoxy resin and thermoset resin having a similar structure. The epoxy-resin composition obtained by the present invention is excellent in its impregnating property, processability, impact resistance, drug resistance, electric-insulating property, and adhesiveness.

Method for preparing a high-heat-resistant-epoxy-resin composition

A heat-curable resin composition comprising a multifunctional epoxy resin monomer and a heat-latent curing agent of formula (I) provides a cured epoxy resin having good thermal and dimensional stability: ##STR1## wherein: R is hydrogen, a C.sub.1-4 alkyl or C.sub.1-4 alkoxy group.

Heat-curable epoxy resin composition

The present invention provides a method for producing a honeycomb core having excellent thermal stability, mechanical properties and a rapid setting speed, which comprises applying adhesives onto ribbon type of carbon fiber fabrics at regular intervals so as to form the specific size of a cell, attaching the ribbons in a layered form and heat setting and expanding the attached portion to form a basic honeycomb core and then impregnating and setting the basic honeycomb core in phenol resin containing 0.5 to 4% by weight of graphite powder having 0.3 to 2 .mu.m of average diameter. This method is characterized by the fact that fiber breakage due to thermal decomposition gas occurring in the setting treatment is prevented and the dispersing effect of surface of graphite is maximized, and thereby the thermal and mechanical properties of the honeycomb core can be optimized.

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Daejeon, South Korea

Jae-Rock Lee