Abstract:
본 발명에 따른 난연 특성을 갖는 나노입자는 (A) 히드록시기를 표면에 갖는 콜로이달 나노입자와 (B) 상기 히드록시기와 화학 결합이 가능한 작용기를 최소한 하나 이상을 갖는 인계 화합물을 반응시켜 나노입자의 표면에 상기 인계 화합물이 화학적으로 결합된 구조를 갖는 것을 특징으로 한다. 나노입자, 난연성, 히드록시기, 인계 화합물, 표면처리, 콜로이달 금속, 금속 산화물, 금속 수산화물
Abstract:
A thermoplastic nanocomposite resin composition is provided to improve scratch resistance while maintaining good physical properties including processability, impact resistance and heat resistance, and to reduce the amount of inorganic fillers. A thermoplastic nanocomposite resin composition having improved scratch resistance comprises: (A) 100 parts by weight of a thermoplastic resin; and (B) 0.1-50 parts by weight of metal (oxide) nanoparticles surface-demineralized with a silane-based compound. The thermoplastic resin is selected from the group consisting of polycarbonate, polyolefin, polyvinyl chloride, polyphenylene ether, polyphenylene sulfide, polyester, polyamide, (meth)acrylate polymer, aromatic vinyl compound copolymer resin, rubber-modified aromatic vinyl graft copolymer resin, aromatic vinyl compound-vinyl cyanide compound copolymer resin and a mixture thereof.
Abstract:
PURPOSE: A process for preparing a SAN(acrylonitrile-butadiene-styrene) graft copolymer of core-shell structure having excellent appearance and whiteness and high rubber content is provided. CONSTITUTION: The process for preparing a SAN graft copolymer comprises the steps of: introducing ion exchanged water into which a water soluble initiator is dissolved, and an emulsifier into a polybutadiene elastomeric polymer having an average particle diameter of 0.28 to 0.33 micrometers and gel content of 75 to 85 wt%; heating the mixture to 55 to 65 deg.C in order to swell the water soluble initiator into the elastomeric polymer and in order to decompose to form a radical gradually; introducing continuously an aromatic vinyl compound and an unsaturated nitrile compound which are the monomers to be grafted onto the elastomeric polymer, an emulsifier and a molecular weight modifier; heating the mixture to the final temperature of 75 to 85 deg.C and terminating the polymerization when the conversion is 95 to 98% and solid content is 40 to 44 wt% to obtain a SAN graft copolymer latex; and then introducing a solidifying agent consisting of an aqueous acid solution and aqueous salt solution to solidify the SAN graft copolymer resin.
Abstract:
PURPOSE: A thermoplastic resin composition and its preparation method are provided, to improve the weather resistance and the impact resistance by employing a graft copolymer containing two different kinds of rubbery polymers. CONSTITUTION: The method comprises the steps of adding a graft monomer mixture of an aromatic vinyl monomer and an unsaturated nitrile monomer in the presence of an acryl-based rubber latex having a gel content of 85-96 wt% and an average particle diameter of 0.12-0.23 micrometers, adding an emulsifier, a polymerization initiator and an ion exchange water with stirring, heating the mixture with stirring to 50-65 deg.C, stirring the mixture for 10-30 min, and adding an oxidation-reduction catalyst at 60-80 deg.C to prepare a first graft latex until the conversion rate reaches 95 % or more; adding a butadiene-based rubbery polymer latex having a gel content of 60-80 wt% and an average particle diameter of 0.30-0.40 micrometers and a graft monomer mixture in the presence of the obtained first graft latex, increasing the temperature to 50-65 deg.C, adding a molecular weight controlling agent, stirring the mixture for 10-30 min, and adding a polymerization initiator at 60-80 deg.C to prepare a second graft latex until the conversion rate reaches 95 % or more; and continuously adding a graft monomer, a molecular weight controlling agent and a polymerization initiator for 2-4 hours at 65-80 deg.C to prepare a resin composition having the final polymerization conversion rate of 94-98 % and a solid content of 39-43 wt%.
Abstract:
PURPOSE: A method for preparing a polystyrene-based impact modifier and a thermoplastic polystyrene resin containing the impact modifier prepared by the method are provided, to improve the impact strength of an impact modifier without deterioration of the fluidity and gloss of final products. CONSTITUTION: The method comprises the steps of injecting a styrene-based monomer and 30-60 parts by weight of a butadiene rubbery latex having an average diameter of 0.28-0.33 micrometers and a gel content of 75-85 % to a reactor, injecting a molecular weight controller, an emulsifier and an ion exchange water to the reactor, heating the reactor with stirring, and injecting an oil-soluble polymerization initiator to prepare a first graft copolymer latex by polymerizing them until a polymerization conversion rate reaches 93% or more; and injecting a redox-based initiator, a styrene-based monomer and a molecular weight controller to the reactor continuously over 2-5 hours in the presence of the first graft copolymer latex to prepare a second graft copolymer latex.
Abstract:
PURPOSE: A method for preparing an acrylonitrile-butadiene-styrene (ABS) graft copolymer is provided, to improve the impact resistance and the fluidity of an ABS resin by optimizing a rubber content, a particle size of rubber, a degree of grafting and an acrylonitrile content. CONSTITUTION: The method comprises the steps of injecting 50-70 parts by weight of a rubbery polymer latex having an average particle diameter of 0.28-0.35 micrometers and a gel content of 75-85 %, and 10-40 wt% of 50-30 parts by weight of a graft monomer mixture comprising styrene and acrylonitrile, injecting a molecular weight controlling agent, a reducing agent, an emulsifier and an ion exchange water with stirring and heating the reactor, and adding a catalyst mixture to the reactor to prepare a first graft copolymer latex until the polymerization conversion rate reaches 90-96 %; and adding the remaining graft monomer mixture and a molecular weight controlling agent to the obtained graft copolymer latex, and continuously adding a polymerization initiator for 2-5 hours to prepare a second graft copolymer latex. Preferably the reducing agent is dextrose.
Abstract:
Nanoparticles having flame retardancy and a preparation method thereof are provided to ensure excellent fire retardancy while maintaining the stabilized property of resin. Nanoparticles having flame retardancy has a structure that a phosphorus compound is chemically bonded on the surface of nano particles by reacting (A) colloidal nano particles having -OH on the surface and (B) a phosphorus compound having at least one functional group capable of being chemically bonded with the -OH group. The average particle diameter of the colloidal nano particles(A) is 1~300 nm, the surface area is 1~1000 m^2 / g, the number of -OH of the particle surface is 101~107 per a particle and pH is 1~12.
Abstract:
본 발명의 폴리스티렌계 충격보강제의 제조방법은 평균입자직경이 0.28 내지 0.33㎛이고 겔 함량이 75 내지 85%인 부타디엔 고무질 라텍스 30 내지 60 중량부에 스티렌계 단량체를 반응기에 투입하고, 분자량조절제, 유화제 및 이온교환수를 투입, 교반하면서 반응기를 승온시킨 후, 지용성 중합개시제를 투입하여 중합전환율이 93% 이상에 이르도록 1차 그라프트 공중합체 라텍스를 제조하는 제1단계; 및 상기 1차 그라프트 공중합체 라텍스 존재 하에 레독스계 개시제, 스티렌계 단량체 및 분자량조절제를 2 내지 5 시간에 걸쳐 연속적으로 투입하여 2차 그라프트 공중합체 라텍스를 제조하는 제2단계로 이루어진다. 열가소성 폴리스티렌 수지(HIPS), , 내충격성, 유동성, 광택도, 스티렌, 부타디엔, 단량체, 공중합체