Hanwha Chemical Corporation

Hanwha Solutions Corporation

Seung Hoe Do

Jin Seo Lee

Do Kyoung Kim

Kyung Ho Kwon

Hye Yeon Lee

Kyoung Won Yim

Seong Yun Jeon

Dae Hak Kim

Joo Hee Han

Seong Cheol Hong

Jung Ho Kong

Man Woo Jung

Joo Seok Oh

Jae Yun Lim

Gi Woo Han

Provided is a method for preparing a polyamide by an anionic polymerization reaction, wherein lactam, and based on 100 parts by weight of the entire lactam, 0.01 parts by weight to 20 parts by weight of an alkali metal as an initiator, 0.3 parts by weight to 10 parts by weight of a molecular weight controller, and 0.002 parts by weight to 1.0 part by weight of carbon dioxide as an activator may be included.

Method for preparing polyamide by anion ring-opening polymerization and polyamide prepared thereby

Provided are a method for producing a polyamide including an amide-based molecular weight controller and a polyamide produced thereby, wherein the amide-based molecular weight controller may easily control the molecular weight of the polyamide to have a narrow molecular weight distribution so as to prevent an increase in the molecular weight due to a basic intermediate produced in anionic polymerization and a side reaction generated under a high-temperature polymerization condition.

Method for producing polyamide comprising amide-based molecular weight modifier, and polyamide produced thereby

The present invention provides a method for producing a polyamide with controlled activator addition, and a polyamide produced thereby, the method allowing a polymerization conversion rate and a polydispersity index (PDI) to be enhanced by controlling the addition of an activator so as to prevent a gelation phenomenon that occurs during anionic polymerization.

Method for producing polyamide with controlled activator addition, and polyamide produced thereby

The present invention relates to a method for producing a polyamide by coordinated anionic ring-opening polymerization and a polyamide produced thereby, wherein metal alkoxide as an initiator and metal hydride as a catalyst are added to enable polymerization having a narrow molecular weight distribution and uniform molecular weight within a short polymerization reaction time at a low temperature, without a separate vacuum process, as compared with an existing polymerization method.

Method for producing polyamide by coordinated anionic ring-opening polymerization, and polyamide produced thereby

The present invention relates to a lightweight sandwich steel sheet using polyamide, and more particularly, to a lightweight sandwich steel sheet using polyamide and a manufacturing method therefor, the steel sheet being usable at a wider temperature range than that of a conventional sandwich steel sheet and, particularly, having excellent adhesion at a low temperature and remarkably increasing stability and lightweight property.

Lightweight sandwich steel sheet using polyamide, and manufacturing method therefor

There are provided a graphene having an oxygen atom content in a predetermined range or less and a carbon/oxygen weight ratio in a specific range to show excellent electrical and thermal conductivity properties, and a barrier property, and a method and an apparatus for preparing the graphene having excellent electrical and thermal conductivity properties and a barrier property by using a subcritical-state fluid or a supercritical-state fluid. According to the method and the apparatus for preparing the graphene, impurities such as graphene oxide, and the like, may be effectively removed, such that uniformity of the graphene to be prepared may be increased, and therefore, the graphene which is highly applicable as materials throughout the industry may be mass-produced.

Graphene, method and apparatus for preparing graphene

Provided is a heat-dissipating paint composition using a carbon material, the heat-dissipating paint composition including a dispersion solution containing a surface treated carbon material, a heat resistance additive, and an adhesion improving emulsion, so that the heat-dissipating paint composition can have excellent heat dissipation performance and can be applied to various industrial field requiring temperature control.

High-efficiency heat-dissipating paint composition using a carbon material

There are a method and an apparatus for modifying a graphene, and more specifically, a method and an apparatus for modifying a graphene capable of obtaining the graphene having a desired crystallite size by repeating a process for modifying the graphene using subcritical or supercritical carbon dioxide several times. According to the method and the apparatus for modifying the graphene of the present invention, the graphene having excellent electrical conductivity and dispersibility may be obtained.

Method and apparatus for modifying graphene

Provided area carbon nanotube composite material obtained by treating a mixture including carbon nanotubes, at least one carbon compound other than carbon nanotubes and a dispersion medium under a sub-critical or super-critical condition of 50-400 atm, and a method for producing the same. More particularly, the method for producing a carbon nanotube composite material, includes: introducing a mixture including carbon nanotubes, at least one carbon compound other than carbon nanotubes and a dispersion medium into a preheating unit under a pressure of 1-400 atm to preheat the mixture; treating the preheated mixture under a sub-critical or super-critical condition of 50-400 atm; cooling and depressurizing the resultant product to 0-1000 C and 1-10 atm; and recovering the cooled and depressurized product. Provided also is an apparatus for producing a carbon nanotube composite material in a continuous manner.

Blending improvement carbon-composite having carbon-nanotube and its continuous manufacturing method and apparatus

Provided is a resin composition for electromagnetic interference shielding. More particularly, provided is a resin composition having superior dispersibility and impact relaxation and high conductivity, the resin comprising: (a) 100 parts by weight of a resin; based on 100 parts by weight of the resin, (b) 0.1 to 15 parts by weight of a carbon nanotube surface-modified in a condition of the absence of oxidant; and (c) 1 to 40 parts by weight of a carbon compound, a metal, a metal compound, or a mixture thereof. The resin composition for electromagnetic interference shielding, comprising a carbon hydride composite, is specifically useful in an electronic control unit material for weight reduction of car, and thus can be replaced with a high-priced heavy metal material.

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Daejeon, South Korea

Seung Hoe Do