Abstract:
A flame retardant polyolefin crosslinked foam composition is provided to recycle waste resin, thereby improving environmental friendliness, working process and foaming characteristics. A flame retardant polyolefin crosslinked foam composition comprises 100 parts by weight of a resin which comprises 30-50 wt% of polypropylene, 30-50 wt% of recycled polyethylene, 0-30 wt% of recycled ethylene-vinyl copolymer, 0-10 wt% of ethylene-propylene copolymer, 10-20 wt% of polyethylene graft maleic anhydride, and 0-10 wt% of polypropylene graft maleic anhydride; at least one additive selected from 2-5 parts by weight of a crosslinking agent, 10-15 parts by weight of a foaming agent, 0-2 parts by weight of a foaming aid, 0-2.5 parts by weight of an internal releasing agent, 0-5 parts by weight of an external releasing agent, 0-10 parts by weight of a plasticizer, and 0-2.5 parts by weight of a heat transfer promoter; and 130-190 parts by weight of a flame retardant.
Abstract:
PURPOSE: A method for lowering molecular weight of alginates and fucoidan is provided to ensure fast reaction speed using electronic beams and to simply lower the molecular weight of alginates and fucoidan in high yield. CONSTITUTION: A method for lowering molecular weight of alginates and fucoidan comprises a step of irradiating electron beams to a polymer alginate solution. 0.5~2.0 weight% of alginate is included in the polymer alginate solution. The electronic beam is irradiated in a dose of 0.1~20 kGy in the energy of 1~3 MeV. The method for lowering molecular weight of alginates and fucoidan allows oxygen to be pumped or uses hydrogen peroxide of 0.5~4.5% concentration as a catalyst for lowering molecular weight.
Abstract:
A flame-retarding composition is provided to reduce processing costs of waste and to be environment-friendly by recycling artificial marble waste powder and coal ash, and to prepare non-toxic flame retardant product which is suitable for international environment standard. A flame-retarding composition comprises coal ash 0~120 phr, artificial marble waste powder 0~120 phr, ethylene vinylene aceta 0~20 phr, ammonium polyphosphate 0~7 phr and magnesium hydroxide 30~200 phr based on the polymer resin 100.0 phr. A method for manufacturing the flame-retarding composition comprises the steps of: (a) solution coating coal ash, artificial marble powder or combination thereof with a compatibilizer solution, drying and filtering the product; and (b) mixing the dried coal ash or artificial marble powder with a flame-retardant aid, compatibilizer and polymer resin.
Abstract:
A polyhydroxyamide copolymer is provided to improve the processability and solubility of polyhydroxyamide without the deterioration of heat resistance and thermal stability of polybenzoxazole. A polyhydroxyamide copolymer comprises 30-70 wt% of a dimethylphenoxy-polyhydroxyamide represented by the formula 1 and 30-70 wt% of a polyethylene glycol methyl ether-polyhydroxyamide represented by the formula 2, wherein the polyhydroxyamide copolymer has a weight loss of 5% at 257-269 deg.C and a maximum weight reduction temperature of 355-397 deg.C; n is an integer of 3-1,000; R is (CH2CH2O)pCH3; and p is an integer of 2-500. The polyhydroxyamide copolymer is a precursor of a polybenzoxazole copolymer.
Abstract:
PURPOSE: A low-density polyolefin foamed body is provided to secure the fire retardant property, the profitability, and the environment-friendly property by inducing the cell gradient of the foamed body. CONSTITUTION: A fire retardant low-density polyolefin foamed body contains the following: 100 parts of resin by weight containing recycled low-density polyethylene and a recycled ethylene vinylacetate copolymer in a weight ratio of 8:2~6:4; 2~5 parts of cross-linking agent by weight; 10~15 parts of blowing agent by weight; 0~2 parts of blowing aid by weight; 0~2.5 parts of internal release agent by weight; 0~5 parts of external release agent by weight; 0~10 parts of plasticizer by weight; 0~2.5 parts of heat transfer accelerator by weight; 0~2.5 parts of additive by weight; and 150~250 parts of flame retardant by weight.
Abstract:
The present invention relates to a flame retardant polystyrene foam in which a polystyrene foam is coated with a solution which mixes: one or more flame retardants which are selected from expandable graphite, montmorillonite, and organoclay; and an adhesive which includes polyvinylalcohol and melamine. According to the present invention, a method for manufacturing the flame retardant polystyrene foam is provided which reduces generation of harmful gas (HBr, HCl, and the likes) when burned due to halogen-free flame retardant, does not drastically increase specific gravity without degrading functionality of foam such as lowering foaming ratio or not influencing the foaming, and has excellent adhesion of foam beads with the flame retardant so that the flame retardant polystyrene foam can be provided which induces formation of char when burned and blocks flame by producing a carbonized film. [Reference numerals] (AA) Start; (BB) End; (S1) Mix PVA with melamine; (S2) Manufacture adhesive; (S3) Manufacture flame retardant; (S4) Mix flame retardant with adhesive; (S5) Coat on EPS
Abstract:
본 발명은 전자빔 조사에 의한 알지네이트와 후코이단의 저분자화 방법에 관한 것으로서, 보다 상세하게는 고분자 알지네이트 용액 또는 고분자 후코이단 용액에 전자빔을 조사하는 것을 특징으로 하는 알지네이트 또는 후코이단의 저분자화 방법에 관한 것이다. 본 발명에 따른 저분자화 방법에 의하면 전자빔을 사용하므로 반응 속도가 빠르고, 깨끗하며, 높은 수율로 알지네이트와 후코이단을 간단하게 저분자화시킬 수 있는 효과가 있으며, 제조된 저분자화 된 알지네이트와 후코이단은 다양한 효능을 갖는 기능성 식품, 의학적 용도 등 다양한 용도로 유용하게 이용할 수 있다. 알지네이트, 후코이단, 전자빔 조사, 저분자화
Abstract:
PURPOSE: An antibacterial cosmetic composition containing low molecular alginate, fucoidan, and silver-alginate is provided to safely ensure antibacterial activity and antioxidation effects. CONSTITUTION: An antibacterial cosmetic composition contains low molecular alginate having a molecular weight of 150 kDa or less; low molecular fucoidan having a molecular weight of 35 kDa or less; low molecular silver-alginate having a particle size of 0.1-3.4 um. The low molecular silver-alginate is prepared by adding 1.5-4.5 weight% of hydrogen peroxide to a solution containing 0.1-2.0 weight% of alginate; irradiating an electron beam to the mixture solution at 1.0-3.0MeV; adding a silver nitrate(AgNO_3) solution; and collecting precipitate. The cosmetic composition is manufactured in the form of skin lotion, skin softener, skin toner, astringent, lotion, milk lotion, moisture lotion, cleansing foam, cleansing lotion, body lotion, or body cleanser.