CAJ | 학술논문

根据注塑瓶盖制品性能和对产品加工的要求，结合管式法低密度聚乙烯生产装置的工艺特点，确定了果酒包装内盖专用低密度聚乙烯树脂LD607BW的基本物性指标：密度为（0.921±0.002）g/cm3，熔体流动速率为（7.5±1.0）g/10min，拉伸断裂应力≥8MPa，断裂标称应变≥80％。根据基本物性指标确定了试生产工艺条件，包括聚合温度、聚合压力和对助剂的要求等。通过提高反应器尾端第四、第五反应区的温度，降低反应压力，使长链支化、短链支化增多，降低了产品的密度和硬度，解决了制品的翘曲问题。产品性能测试及应用表明，工业化试生产的LD607BW满足指标要求且质量稳定。
근거주소병개제품성능화대산품가공적요구，결합관식법저밀도취을희생산장치적공예특점，학정료과주포장내개전용저밀도취을희수지LD607BW적기본물성지표：밀도위（0.921±0.002）g/cm3，용체류동속솔위（7.5±1.0）g/10min，랍신단렬응력≥8MPa，단렬표칭응변≥80％。근거기본물성지표학정료시생산공예조건，포괄취합온도、취합압력화대조제적요구등。통과제고반응기미단제사、제오반응구적온도，강저반응압력，사장련지화、단련지화증다，강저료산품적밀도화경도，해결료제품적교곡문제。산품성능측시급응용표명，공업화시생산적LD607BW만족지표요구차질량은정。
The basic physical property specifications of low density polyethylene LD607BW for inner cap of wine packaging were determined considering the performance demands of injection molding bottle cap, the processing demands of the product, and the technical characteristics of tubular process for low density polyeth-ylene. The density of LD607BW was (0.921±0.002)g/cm3, the melt flow rate was (7.5±1.0)g/10 min, the tensile stress at break was greater than or equal to 8 MPa, and the nominal tensile strain at break was greater than or equal to 80%. The technological conditions of the trial production were affirmed, including the polymerization temperature, the polymerization pressure and the assistant agent, according to the physical property indicators. The long-chain and short-chain branching were increased by increasing the temperature of the fourth and fifth reaction zones, and decreasing the reaction pressure, thus lowering the density and hardness of the product, solv-ing the warping problem of the product. The performance testing and application indicated that the trial product LD607BW met the quality requirements and had good quality stability.