滚塑工艺对IV型储氢瓶PE-HD内胆性能的影响  

Effect of Rotational Molding Process on Performance of PE-HD Liner of Type IV Hydrogen Storage Tank

作　　者：向贵锋 刘超 赵瑞 张习龙 聂新羽 柴枫 马晨辉 Xiang Guifeng;Liu Chao;Zhao Rui;Zhang Xilong;Nie Xinyu;Chai Feng;Ma Chenhui(Hubei Sanjiang Aerospace Jianghe Chemical Technology Co.,Ltd.,Yichang 444200,China)

机构地区：[1]湖北三江航天江河化工科技有限公司,湖北宜昌444200

出　　处：《工程塑料应用》2023年第9期77-82,共6页Engineering Plastics Application

摘　　要：针对高压车载大容量IV型储氢气瓶塑料内胆工程化制备需求,研制出140L IV型储氢气瓶高密度聚乙烯(PE-HD)内胆,研究了滚塑成型加热温度及时间、滚塑设备主副轴转速比、冷却方式及时间等工艺参数对PE-HD内胆制品表观、力学性能的影响,结果表明先预热后升温的两段式加热能保证PE-HD粉料充分熔融且不发生高温氧化,制品外观无气泡等缺陷,力学及缺口冲击强度优良;随着主副轴转速比的增加,内胆制品壁厚均匀性及表面气泡问题逐渐改善,但过高的转速比易造成制品局部位置缺料;PE-HD内胆制品的韧性和冲击强度与冷却速率呈正相关,差示扫描量热曲线表明越温和的冷却方式,降温过程时间越长,PE-HD内胆试样的结晶度越大,缓慢的降温过程可以使分子链更充分地排入晶格,促进结晶;先风冷后自然冷的两段式冷却方式能有效防止制品变形,制备的内胆综合性能最佳,其拉伸强度达18.255 MPa,断裂延伸率为486.1%,简支梁缺口冲击强度为13.08 kJ/m^(2),为同类储氢气瓶塑料内胆研制及材料开发提供一定参考。In view of the engineering preparation requirements of high-pressure vehicle large-capacity type IV hydrogen storage tank plastic liner,140 L high-density polyethylene(PE-HD)inner liners were prepared,and the effects of heating temperature or time,rotational speed ratio of the equipment,cooling mode and cooling time on the appearance,mechanical properties of them were analyzed.The results show that the two-stage heating with preheating and then warming up could ensure the full melting of PE-HD powder without high temperature oxidation,and the appearance of the products without bubbles and other defects,mechanics and notched impact strength is excellent.With the increase of the main and secondary rotational speed ratio,the wall thickness uniformity and the surface bubble problems are gradually improved,but too high a ratio of speed is prone to cause the products of the lack of local position.The toughness and impact strength of PE-HD liners are positively correlated with the cooling rate,the differential scanning calorimetry curve show that the more mild cooling mode,the longer the cooling process,the greater the crystallinity of the PE-HD liner samples,the slow cooling process could make the molecular chain more fully discharged into the crystal lattice to promote crystallization.The first air-cooled and then naturally cooled in a two-stage cooling mode could prevent the products from being deformed,the liner prepared with the best overall performance,the tensile strength of prepared liner is 18.255 MPa,the elongation at break is 486.1%,and the notched impact strength of the simple beam is 13.08 kJ/m^(2),which provide a certain reference for the development of plastic inner liner and material development for similar hydrogen storage cylinders.

关 键 词：储氢气瓶 高密度聚乙烯 塑料内胆 滚塑工艺 缺口冲击强度 

分 类 号：TQ322.2[化学工程—合成树脂塑料工业]