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- 주제어 : polyvinyl acetate resin (검색결과 4 건)
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난분해성 PVB 수지 제조공정 폐수의 화학적-생물학적 연계처리방안
송연민(Yun-Min Song),전세진(Se-Jin Jun) 한국환경관리학회 2016 環境管理學會誌 Vol.22 No.2
본 연구에서는 화학응집, 펜톤산화, 활성슬러지공정을 적용하여 PVB(Polyvinyl butyral) 수지 제조 공정에서 발생하는 폐수처리의 최적화에 대한 연구를 수행하였다. 폐수의 특성을 조사한 결과 n-Buthyl acetate(n-BA) 800 mg/L, NaCl 1.08%, CODMn 393 mg/L, 그리고 CODCr 1,363 mg/L로 분석되었다. 응집제로 철염(FeSO₄ ․ 7H₂O)과 Alum(Al₂(SO₄)₃)을 사용하여 응집 처리한 결과 적정 주입량은 철염을 사용할 경우 100 mg/L, Alum을 사용할 경우 300 mg/L로 각각 나타났다. 펜톤산화 실험 결과, 처리 후 CODCr는 처리전보다 오히려 증가하였다. 이는 첨가된 과산화수소 중유기물의 산화에 사용되지 못한 잉여의 과산화수소가 반응 후에도 잔존함에 기인하기 때문으로, 펜턴산화에 의한 방법은 PVB 폐수의 유기물 제거방안으로 적절하지 않았다. 생물학적 처리법으로 활성슬러지공정을 적용한 결과 유기물질의 제거효율은 CODCr 80.3%, CODMn 95.6%, BOD 97%로 높은 제거효율을 나타내었다. 따라서 PVB 수지 제조공정에서 발생되는 폐수처리를 위해 응집침전 후 펜톤산화공정을 적용하지 않고 활성슬러지공정을 직접 적용하는 것이 경제성을 고려한 보다 효율적 방안이었다. The purpose of this study was to investigate the optimum processes and procedure for the treatment of the wastewater generating from PVB(Polyvinyl butyral) resin manufacturing processes. Chemical coagulation, Fenton’s oxidation and activated sludge processes were independently applied. The test results on the wastewater characteristics indicated n-Buthyl 800 mg/L of acetate(n-BA), 1.08% of NaCl, 393 mg/L of CODMn, and 1,363 mg/L of CODCr in the wastewater. In the chemical coagulation treatment, a ferrous salt(FeSO₄ ․ 7H₂O) and an alum(Al₂(SO₄)₃) were used as coagulants. The optimal concentration of the ferrous salt was 100 mg/L, while the alum was 300 mg/L. In contrast to the coagulation experiment, CODCr was rather increased after the Fenton’s oxidation applied than before. This indicated that the surplus of the hydrogen peroxide used as an oxidant was remained in the treated wastewater after the reaction, and thus, the Fenton’s oxidation was not suitable for the removal of the organics in the PVB wastewater. However, when the activated sludge process was applied for the treatment of the organics in the wastewater, the removal efficiencies were CODCr 80.3%, CODMn 95.6%, BOD 97%, respectively. Therefore, More efficient and cost effective way for the treatment of the PVB wastewater was not to apply Fenton’s oxidation process, but to apply chemical coagulation and activated sludge processes in order.
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고주파 평면가열에 의한 중밀도섬유판(MDF)의 핑거접합
소원택,So, Won-Tek 한국가구학회 2006 한국가구학회지 Vol.17 No.2
This experiment was carried out to investigate the high-frequency gluing characteristics of poly vinyl acetate emulsion adhesive(PVAc) on MDF edge-glued boards. The edge-glued boards were glued lengthwise with butt, scarf, or finger joint. The wastes of MDF boards were reused as board materials. The obtained results are summarized as follows; the bending strength of edge-glued MDF increased slightly with the HF heating time, but the economically desirable heating time was 6 minutes. The bending and tensile strength of edge-glued MDF were high with scarf, finger and butt joint, in order. The strength of finger jointed MDF showed 80% of scarf jointed MDF. The effects of location of finger joints on the bending strength of edge-glued MDF were larger than those of the numbers of finger joints. The bending strength of edge-glued MDF with one joint on the middle position showed 40% decrease in comparison with non-jointed MDF.
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핑거접합방식에 의한 삼나무의 고주파가열 집성판 제조에 관한 연구 (1) - 삼나무 판재의 초산비닐수지 접착특성 -
소원택,채정기,So Won-Tek,Chai Jyung-Ki 한국가구학회 2005 한국가구학회지 Vol.16 No.1
This experiment was carried out to investigate the gluing characteristics of poly vinyl acetate emulsion adhesive(PVAc) on the Cryptomeria japonica laminated boards. This sample trees are major planting species and have been planted in southern district for a long time. The optimum gluing conditions for laminated board were summarized as follows; the amount of spreading glue, assembly time, clamping pressure, and clamping time for PVAc resin were $200g/m^2$, 10min., $5kg/cm^2$, and 6hrs., respectively, and the relative formulae between extension ratio(x) and block shear strength(y) was $y=-9.6x+85.2(R^2=0.95)$.
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