LCD 제조공정의 혼합폐산으로부터 일인산암모늄 제조 기술

이하영(Ha-young Lee),이상길(Sang-gil Lee),박성국(Sung-Kook Park),김주한(Ju-han Kim),김주엽(Ju-yup Kim),김준영(Jun-young Kim) 한국청정기술학회 2009 청정기술 Vol.15 No.4

폴리인산 암모늄과 HMDI 기반으로 제조된 수분산 폴리우레탄 수지의 물리적 특성 연구

이주엽 한국응용과학기술학회 2020 한국응용과학기술학회지 Vol.37 No.6

본 연구에서는 폴리인산암모늄 인산염과 HMDI로 합성된 수분산 폴리우레탄수지의 물리적 특성을 필름 시료와 피혁(Full-Grain) 표면에 코팅을 하여 물리적 특성 변화를 연구하였다. 내용제성은 모든 시료에서 변확 없음을 확인 할수 있었으며, 인장강도의 경우 폴리인산암모늄이 가장 많이 함유된 DPU-AP3(1.887 kg f /㎟)가 가장 낮은 물성을 보였다. 연실율은 폴리인산암모늄 많이 함유된 시료가 548%로 측정되었다. 내마모성은 폴리인산암모늄이 많이 함유된 시료가 548 ㎎.loss로 측정되어 폴리인산 암모늄과 수분산 폴리우레탄의 블랜딩된 수지의 물성변화가 확인되었다. In this study, the physical properties of water-dispersible polyurethane resins synthesized with polyammonium phosphate and HMDI were studied by coating film samples and full-grain surfaces. Solvent resistance was found to be unchanged in all samples, and in terms of tensile strength, DPU-AP3 (1.887 kgf/㎟) containing the most ammonium polyphosphate showed the lowest physical properties. The elongation rate was measured as 54 8% in the sample containing a large amount of ammonium polyphosphate. Abrasion resistance was measured as 548 mg.loss of a sample containing a lot of ammonium polyphosphate, and it was confirmed that the physical properties of the blended resin of ammonium polyphosphate and water-dispersible polyurethane were changed.

H12MDI를 이용한 수분산 폴리우레탄 수지의 합성 및 ammonium dihydrogen phosphate에 의한 물성변화에 관한 연구

이주엽,남상성 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.1

본 연구에서는 H12MDI(4,4'-methylene dicyclohexyl diisocyanate)를 이용한 수분산 폴리우레탄 수지를 합성한 다음 방염제로 활용이 되고 있는 2-인산암모늄(ammonium dihydrogen phosphate) 수용액을 수분산 우레탄 수지에 적하량을 점차 증가시켜 변화하는 물성을 피혁(leather)에 표면 코팅처리된 상태 및 열풍 건조시킨 필름의 물성을 측정 분석하였다. 내용제성 측정 결과 높은 내용제성 물성을 지닌 폴리우레탄 수지에 2-인산암모늄의 함량에 따른 물성적 변화는 크게 없었으며 모두 높은 물성치를 나타내었다. 인장 강도 측정치에서는 폴리우레탄 단독 필름의 측정치가 3.114 kgf/㎟로 가장 높은 수치를 나타내었으며, 2-인산암모늄의 합량이 제일 높은 DPU-AD3가 가장 낮은 인장력 2.510 kgf/㎟을 나타내었다. 또한 내마모도 측정에서는 DPU가 제일 높은 50.50 ㎎.loss로 우수한 물성변화를 나타내었고, 연실율의 경우역시 우레탄 단독 코팅인 DPU가 602 %로 가장 높은 수치를 나타내었다. DSC측정결과 2-인산암모늄의 함유가 높은 DPU-AD3이 Tm 값이 384℃로 고온에서 가장 안정한 수치를 나타내었다. For this research, prepared ammonium dihydrogen phosphate aqueous solution and polyurethane dispersion. Use these resin, this article has been analyzed about change of mechanical properties by increasing amount of ammonium dihydrogen phosphate aqueous solution in polyurethan resin on coated leather and dried film. According to measure data for solvent resistance, DPU(polyurethane dispersion) resin and DPU-AD1, D2, D3(samples of polyurethaneresin with ammonium dihydrogen phosphate aqueous solution) had good property. As known in the results, increase of ammonium dihydrogen phosphate constant did not influence to big change of polyurethane resin properties. As test of tensile strength, DPU had highest tensile characteristic(3.114 kgf/㎟) and DPU-AD3 had lowest tensile characteristic(2.510 kgf/㎟). As same as tensile characteristic, abrasion test determined DPU(50.5 ㎎.loss) had highest properties. In elongation case, DPU had best properties(602 %) in this experiment.

마그네슘 공급원과 MAP 결정화 효율과의 관계

안조환 유기성자원학회 2022 유기물자원화 Vol.30 No.1

Batch experiments were conducted to find out the effects of various types of magnesium compounds on phosphorus recovery by magnesium ammonium phosphate (MAP) crystallization. The phosphorus recovery from the centrate of anaerobic digested sludge was performed using magnesium chloride, magnesium hydroxide and magnesium oxide under different pH (7.5, 8.0 and 8.5) and Mg/P molar ratio (1.0, 1.5, 2.0, 2.5) conditions. The phosphorus recovery rate increased with increasing pH and Mg/P molar ratio in all magnesium compounds. At pH 7.5, magnesium oxide showed the highest phosphorus recovery rate, followed by magnesium hydroxide and magnesium chloride. However, at pH 8.5, more than 90% of phosphorus recovery rate was obtained in all Mg/p molar ratios. Thus, it is expected that magnesium hydroxide and magnesium oxide are able to replace magnesium chloride as a magnesium source in terms of phosphorus recovery efficiency and cost. 혐기성 소화 슬러지 탈리여액을 대상으로 마그네슘 공급원이 인산암모늄마그네슘(MAP) 결정화에 의한인산염 회수에 어떠한 영향을 미치는지 알아보기 위해 회분식 실험을 실시하였다. 마그네슘 공급원으로 염화마그네슘, 수산화마그네슘 그리고 산화마그네슘을 사용하여 다양한 pH (7.5, 8.0 및 8.5) 조건 및 Mg/P 몰 비율(1.0, 1.5, 2.0 및 2.5)에서 인산염 회수를 실시하였다. 그 결과, 마그네슘 공급원과 관계없이 pH 조건과 Mg/P 몰 비율이 높을수록인산염 회수율이 증가하였다. pH가 가장 낮은 7.5의 조건에서는 Mg/P 몰 비율이 증가할수록 인산염 회수율이 증가하였는데 산화마그네슘, 수산화마그네슘, 염화마그네슘의 순으로 높았다. 그러나 pH가 가장 높은 8.5의 조건에서는Mg/P 몰 비율과 관계없이 모든 마그네슘 공급원에서 90% 이상의 높은 인 회수율을 얻을 수 있었다. 따라서 낮은pH 조건에서도 높은 인산염 회수율을 얻을 수 있었던 수산화마그네슘과 산화마그네슘이 경제적인 측면뿐만 아니라효율적인 측면에서도 염화마그네슘을 대체할 수 있을 것으로 기대된다.

인산나트륨계 염화암모늄 pH저감제의 반응성 검토

신기돈 ( Shin Ki-don ),고산 ( Gao San ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2

Previous studies have confirmed the performance of pH reduction agents using liquid sodium phosphate based ammonium chloride as a pH reduction agent. In this study, the pH reduction performance considering economical and applicability as a practical stage and the property change analysis for the identification of the reaction mechanism of the pH reduction agent were carried out. As a result, the pH reduction performance at a low rate of the pH reducing agent was confirmed. The specific gravity of CaO decreased significantly after XRF analysis. It is also believed that this reduces the amount of Ca(OH)₂ produced and contributes to pH reduction.

인산암모늄을 사용한 순환골재의 pH 저감 성능 검토

고산 ( Gao Shan ),이건철 ( Lee Gun-cheol ),박지웅 ( Park Ji-woong ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.2

Construction waste is recycled and used for the efficient and eco-friendly disposal of construction waste increasing due to reconstruction and redevelopment project and so on. There is recycled aggregate as a typical case. And this recycled aggregate shows strong alkalinity due to calcium hydroxide, and causes many environmental problems. Therefore, this is a study on reduction in the strong alkalinity of recycled aggregate by using phosphate of ammonium in order to reduce the pH of recycled aggregate. Besides, a possibility that a pH reducing agent of recycled aggregate could be applied to a site was evaluated. As a result, it was possible to verify that pH decreased as the percentage of pH reducing agent increased. It is thought that the pH reducing agent can be applied to a site by methods such as immersion and spray using the pH reducing agent in the process of producing recycled aggregates.

마그네시아 인산염 시멘트를 사용한 초속경 보수 모르타르의 기초물성 및 내구성에 관한 연구

강인석(Kang In-Seuk),한다희(Han Da-Hee),안무영(Ahn Moo-Young),박무영(Park Moo-Young),백민수(Paik Min-Su),정상진(Jung Sang-Jin) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1

Repair cement is recently used to repair concrete structure. Repair cement is divided into inorganic materials and organic materials. Portland cement is most representative among inorganic materials and asphalt and polymer cement are included in organic ones. The merit of repair cement is to be used for structure repair in the shortest time and the repaired structure can be used soon. For this purpose, it is indispensable to use high early strength cement for short time repair than shaped steel cement or ultra high early strength cement. However, research on the high early strength magnesia polyphosphate cement has not been done so far. In this research, using magnesia cement and ammonium monophosphate, basic properties and durability as repair materials have been examined to develop high early strength mortar for concrete structure repair. The results show that 1) for the setting time influencing factor, working life increased as MAP/MgO ratio increases. 2) MAP/MgO ratio affected on compression strength and flexural strength. 3) Freezing melting heat and retarder C.A3% were most excellent, and freezing melting was retadrded as the substitution ratio of fly ash increases.

습식 순환골재의 생산공정에 적용 가능한 pH 저감제의 성능 검토

최중구,이건철,Choi, Jung-Gu,Lee, Gun-Cheol 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.4

재건축 재개발 사업 등으로 인하여 증가하는 건설폐기물을 효율적이고 친환경적으로 처리하기 위하여 건설폐기물을 재활용하여 사용하고 있다. 대표적으로 순환골재가 있으며, 이는 수산화칼슘에 의하여 높은 강알칼리성을 나타내며 많은 환경문제를 발생시키고 있다. 따라서 본 연구는 순환골재의 pH를 저감하기 위해 인산나트륨계암모늄염을 사용하여 순환골재의 강알칼리성을 감소시키기 위한 연구이다. 또한, 순환골재 pH 저감제의 현장적용 가능성을 평가하였다. 그 결과 pH 저감제 비율이 증가할수록 pH가 감소하는 것을 확인할 수 있었으며 순환골재 생산과정 중 pH 저감제를 이용한 침지, 분사 등의 방법으로 현장적용이 가능할 것으로 판단된다. Construction waste is recycled and used for the efficient and eco-friendly disposal of construction waste increasing due to reconstruction and redevelopment project and so on. There is recycled aggregate as a typical case. And this recycled aggregate shows strong alkalinity due to calcium hydroxide, and causes many environmental problems. Therefore, this is a study on reduction in the strong alkalinity of recycled aggregate by using sodium phosphate based ammonium in order to reduce the pH of recycled aggregate. Besides, a possibility that a pH reducing agent of recycled aggregate could be applied to a site was evaluated. As a result, it was possible to verify that pH decreased as the percentage of pH reducing agent increased. It is thought that the pH reducing agent can be applied to a site by methods such as immersion and spray using the pH reducing agent in the process of producing recycled aggregates.

잉여 슬러지의 마이크로웨이브 가온과 MAP 결정화를 이용한 인산염 회수

안조환 대한상하수도학회 2019 상하수도학회지 Vol.33 No.4

Phosphorus is a vital resource for sustaining agriculture and nutrition, but a limited non-renewable resource. Thus, the recovery of phosphorus from waste activated sludge(WAS) was attempted by microwave heating and magnesium ammonium phosphorus(MAP) crystallization. Polyphosphate-accumulating organisms(PAOs) in WAS release phosphate from the cell when they are exposed to high temperature environments. Microwave heating caused phosphorus and ammonia to release from WAS. The amount was increased with increasing temperature, showing that 88.5% of polyphosphate present in the cells were released in the form of phosphate at 80oC. A similar result was also observed in the release of ammonia. On the other hand, both phosphorus and ammonia were crystallized with magnesium, and then was harvested as MAP. Phosphorus recovery rate reached almost 97.8%, but the ammonia was about 13.4%. These results cleary indicate that phosphorus could be recovered from WAS using a physiological trait of PAOs. Heavy metal analyses also show that the MAP crystal is useful and safe as a phosphorus fertilizer.

MAP 결정화 적용을 위한 잉여슬러지의 인 및 암모니아의 거동 특성

오경수,김장호,박기태,박대원,김형수 대한상하수도학회 2021 상하수도학회지 Vol.35 No.1

Phosphorus is a vital resource for sustaining agriculture and nutrition, but a limited non-renewable resource. This paper aimed to derive the behavioral characteristics of phosphate, ammonia and metals of waste activated sludge (WAS) by process of activated sludge for application of magnesium ammonium phosphate (MAP) crystallization system. WAS used in the experiment was obtained in each activated sludge process, such as A2O, MLE (Modified Ludzack Ettinger), and oxidation ditch. WAS was analyzed for the behavior of phosphate ammonia and metallic materials according to pH and microwave conditions. As a result of evaluating the phosphate, nitrogen, and metal material behavior of each WAS according to the microwave and pH conditions, the release path of the polyphosphate contained in the cells into the phosphate form by analyzing the phosphorus release rate of the excess sludge of various microbial community structures was confirmed. These results are believed to be able to estimate the origin of the released phosphate. In addition, the evaluation of the behavior of phosphate, nitrogen, and metal substances according to microwave heating and pH for each activated sludge process was carried out in a batch test, and the amount of phosphate released was in the order of A2O, MLE, and oxidation dich processes. These results confirmed that phosphate emission was closely related to the dominance of polyphosphate-accumulating microorganisms, whereas in the case of ammonia, it was found that the composition of extracellular polymers and the characteristics of influent water were more affected than the dominance of specific microorganisms. The amount of metal released had a direct effect on the reaction pH condition, and the amount of metal ions released from the WAS released under alkaline conditions formed a metal compound with phosphate and ammonia, resulting in less release.