Abstract:
본 발명은 대부분 소각되는 폐 가교 고밀도 폴리에틸렌계(high density polyethylene, HDPE) 파이프의 가교결합을 초임계 메탄올을 이용하여 탈가교화(decrosslinking) 함으로써 재성형 가능한 고밀도 폴리에틸렌계 파이프로 재생시키는 방법에 관한 것으로, 폐 가교 고밀도 폴리에틸렌계 파이프를 370 내지 390℃의 반응온도 및 5 내지 30 ㎫의 반응압력 조건 하에서 5 내지 10분간 초임계 메탄올을 반응용매로 사용하는 탈가교화 반응에 의해 재성형 가능한 고밀도 폴리에틸렌계 수지로 재생시키는 것을 특징으로 한다. 폐 가교 고밀도 폴리에틸렌, 가교 파이프, 재활용, 초임계 반응, 탈가교화
Abstract:
PURPOSE: A method for regenerating wasted crosslinked high density polyethylene is provided to reduce cost required for de-crosslanking reaction using supercritical methanol as a reaction solvent. CONSTITUTION: Wasted crosslinked high density polyethylene-based pipe is converted into a remoldable high density polyethylene based resin by a decrosslinking reaction for 5 to 10 minutes using supercritical methanol as a reaction solvent under 370 to 390 degrees Celsius of reaction temperature and 5 and 30MPa of reaction pressure. The supercritical methanol is supercritical fluid with 32.04g/mol of molecular weight. The supercritical methanol has 512.6 degree Celsius of critical temperature and 8.09MPa of critical pressure, measured by a pressure gauge(A).
Abstract:
본 발명은 대부분 소각되어지는 폐가교 플라스틱을 초임계 탈가교화 반응시킴으로써 재활용 폴리에틸렌수지를 수득하고 이를 이용하여 발포 성형물을 제조하는 방법에 관한 것이다. 본 발명의 발포 성형물 제조 방법은 폐가교 플라스틱을 초임계 탈가교화 반응시켜 재활용 폴리올레핀 수지를 수득하는 단계; 10 내지 100중량%의 상기 재활용 폴리올레핀수지를 포함하는 지배수지 100 중량부, 발포제 1 내지 10 중량부 및 가교제 0.2 내지 5 중량부를 혼합하는 단계; 및 상기 혼합물을 170 ℃ 이상의 온도에서 발포시키는 단계를 포함한다. 본 발명은 재활용되지 못하고 버려짐으로써 각종 환경문제를 야기하는 폐가교 플라스틱의 재활용 기술에 대한 것이며, 특히 반응 조건에 매우 민감한 발포 성형물 제조 공정에 상기 폐가교 플라스틱로부터 수득되는 재활용 폴리올레핀수지를 이용하고자 하는 시도인 점에서 장점이 있다.
Abstract:
PURPOSE: A manufacturing method of a foam product is provided to manufacture a foam product with uniform foam cells from waste crosslinked plastics. CONSTITUTION: A manufacturing method of a foam product comprises: a step of obtaining a recycled polyolefin resin by the supercritical decrosslinking reaction of waste plastics; a step of mixing 100 parts by weight of a base resin which comprises the recycled polyolefin resin, 1-10 parts by weight of a foaming agent, and 0.2-5 parts by weight of a crosslinking agent; and a step of foaming the mixture at 170 deg. C or more. The waste crosslinked plastic is a crosslinked polyolefin-based copolymer. The base resin comprises 10-100 weight% of the recycled polyolefin resin.
Abstract:
The present invention relates to a method for manufacturing a foam article by performing a supercritical de-cross-linking reaction on waste cross-linked plastic, which may be mostly burned, to obtain a recyclable polyethylene resin and then using the recyclable polyethylene resin. The method of the present invention comprises the steps of: subjecting waste cross-linked plastic to a supercritical de-cross-linking reaction to obtain a recyclable polyolefin resin; mixing 100 parts by weight of a dominant resin containing 10-100 wt% of the recyclable polyolefin resin, 1 to 10 parts by weight of a foaming agent, and 0.2 to 5 parts by weight of a cross-linking agent; and foaming the mixture at a temperature of 170°C or higher. The present invention is directed to a recycling technique of waste cross-linked plastic, which is thrown out without being recycled, causing various environmental problems. Therefore, the present invention has an advantage in that the recyclable polyolefin resin obtained from the waste cross-linked plastic is used in the process of manufacturing a foam article, requiring very sensitive reaction conditions.