高透明耐低温流延聚丙烯包装膜配方工艺研究

采用3层共挤流延成型工艺制备了流延聚丙烯（CPP）薄膜,研究了不同增韧材料对CPP薄膜透明度、雾度及低温落镖冲击质量的影响,并研究了成核剂以及工艺条件对其性能的影响。结果表明,芯层添加10份的聚烯烃弹性体、1.5份的成核剂母料,熔体温度控制在255～265 ℃,冷却辊温度在24 ℃以下时,CPP薄膜的低温韧性好,透明度高、雾度低。     

CPP热封薄膜低温热封层性能研究

筛选不同聚丙烯低温热封材料与适量茂金属聚乙烯（mPE）、滑爽剂共混作为热封层,通过3层共挤流延法研制备了流延聚丙烯（CPP）低温热封薄膜,探讨了聚丙烯低温热封材料、热封温度、薄膜厚度、冷却辊温度等对薄膜热封性能的影响。结果表明,热封层中采用40份TF400、60份SFC-750M作为热封层,薄膜厚度控制为30 μm,冷却辊温度为22.6 ℃条件下,制备薄膜的各项性能均达到指标要求,其中热封强度可达16.44 N/15 mm,初始热封温度可降至105 ℃。     

低摩擦因数CPP热封膜的研究

添加自制爽滑母料制备了流延聚丙烯(CPP)热封膜,并研究了薄膜电晕面和非电晕面摩擦因数的变化。结果表明:厚度相同的薄膜在高温加热24 h与常温放置30天的电晕面摩擦因数基本相同,可使用薄膜高温所测的摩擦因数模拟常温放置时的摩擦因数变化;与添加某进口爽滑母料生产的CPP热封膜相比,添加自制爽滑母料生产的CPP热封膜的摩擦因数在放置过程中随着时间的延长而降低,效果优于添加进口爽滑母料生产的薄膜,且各项性能指标均能满足国家标准要求。     

高光低摩擦CPP薄膜的制备及性能研究

采用三层共混挤出流延工艺,以聚丙烯(PP)树脂为原料添加开口爽滑双功能母粒(PP-F608S)制备高光低摩擦流延聚丙烯(CPP)薄膜。通过对薄膜光学性能、力学性能及摩擦性能的测试发现,当PP-F608S添加量为5份时,CPP薄膜透光率为92.6%,雾度为1.3%,光泽度为95.2 GU,纵向拉伸强度为26.6 MPa,横向拉伸强度为25.7 MPa,纵向断裂伸长率为1 214.8%,横向断裂伸长率为1 147.9%,静摩擦系数为0.16,动摩擦系数为0.1,表明PP-F608S双功能母粒具有异相成核功能、增透功能及增强增韧功能;对PP/PP-F608S共混物进行流变性能测试,结果表明PP-F608S具有良好的加工性能;对CPP薄膜截面微观结构观察,发现PP-F608S与PP树脂具有较好的界面融合性,均匀分散于PP中,形成一定的凸起结构。综合来看,添加PP-F608S可提高CPP薄膜各项性能,为高光低摩擦CPP薄膜的生产制备提供技术支撑。     

可里印耐低温流延聚丙烯包装膜电晕处理研究

采用3层流延共挤工艺,研究了不同抗静电剂对流延聚丙烯(CPP)薄膜润湿张力的影响,以及电晕处理功率、处理方式对薄膜润湿张力的影响。结果表明,添加牌号为ASPA 2446OB DC的抗静电剂,采用双站电晕处理的方法制得的双面爽滑的CPP薄膜30d后的润湿张力可保持在38mN/m以上,该薄膜既可里印又可热封,可不经复合直接用于低温包装。     

冷却条件和成核剂对聚丙烯流延薄膜结晶形态及性能的影响

使用添加和未添加成核剂的聚丙烯(PP)树脂挤出流延制备流延薄膜,并采用气刀对薄膜进行冷却。研究了空气冷却条件和成核剂对薄膜结晶形态、光学和力学性能的影响。使用广角X射线衍射技术(WAXD)对薄膜的结晶形态和结晶度进行研究,并采用差示扫描量热法(DSC)对PP流延薄膜的热性能进行研究,同时还考察了薄膜的光学和力学性能。发现空气冷却对于未添加成核剂的薄膜有着很大的影响。当提高气刀风量时,薄膜的结晶度、杨氏模量和屈服应力显著升高,光学性能却有很大程度的下降。然而含有成核剂的薄膜主要受到成核剂的作用,空气冷却对其影响较小。     

食品包装专用CPP薄膜的应用

CPP是塑胶工业中通过流延挤塑工艺生产的聚丙烯（PP）薄膜。该类薄膜与BOPP（双向聚丙烯）薄膜不同，属非取向薄膜。严格地说，CPP薄膜仅在纵向（MD）方向存在某种取向，主要是由于工艺性质所致。通过在冷铸辊上快速冷却，在薄膜上形成优异的清晰度和光洁度。     

CPP低温热封膜的研制

添加自制爽滑母料制备流延聚丙烯(CPP)热封膜,在存储期30d时测得其表面张力大于38mN/m,非电晕面的摩擦系数稳定在0.1~0.2,电晕面的摩擦系数为0.5,纵向拉伸强度达到60 MPa,横向拉伸强度达到27 MPa,薄膜具有高表面张力、较低摩擦系数、较好的力学性能。同时测得其初始热封温度、热封强度和光学性能均优于国家标准,在存储期内薄膜的综合性能稳定。     

扭结膜专用PP树脂及其薄膜的性能

在聚丙烯(PP)中加入扭结助剂制备了扭结膜专用聚丙烯(PP)树脂,并采用挤出流延的方法制备了流延聚丙烯薄膜,采用差示扫描量热法研究了PP的熔融和结晶行为,采用偏光显微镜观察了PP的结晶形态。加入的扭结助剂有阻碍PP结晶的作用,国产PP的结晶度下降了19.3%,但当PP结晶速率较快时,扭结助剂的效果可能会被抵消。加入扭结助剂后,用国产PP树脂制备的薄膜扭结性能和光学性能得到极大改善,且优于进口试样;薄膜的拉伸弹性模量和拉伸屈服应力与进口试样相近。     

POE改性共聚聚丙烯的性能

采用拉力试验机、差示扫描量热仪及扫描电子显微镜等研究了聚烯烃弹性体(POE)对嵌段共聚聚丙烯的增韧效果,重点考察了不同POE及其用量对共混物力学性能、热性能及微观形貌的影响。结果表明:POE的添加对共聚聚丙烯具有明显的增韧效果,且随着POE用量的增加,增韧效果愈加显著,POE-1,POE-2的增韧效果达到进口POE-A水平。     

废聚丙烯/废轮胎胶粉/废尼龙短纤维复合材料 Ⅰ.配方

用双螺杆挤出机制备了废聚丙烯/废轮胎胶粉/废尼龙短纤维(WPP/GRT/WSF)复合材料,通过正交实验得出了制备该复合材料的最佳配方,讨论了增容剂用量、氯化聚丙烯的含氯质量分数、GRT用量及其粒径、WSF用量及预处理对该复合材料力学性能的影响。结果表明,制备该复合材料的最佳配方(质量份,下同)是WPP100,GRT30,WSF8,二甲基二硫代氨基甲酸锌、二硫化二苯并噻唑、多乙烯多胺及重油用量依次为0.6,1.2,0.3,2,聚丙烯接枝马来酸酐、氯化聚丙烯用量依次为8,4;在最佳配方下,该复合材料的非缺口冲击强度为25.2kJ/m2,拉伸强度为13.6MPa;GRT用量为30份时,该复合材料的拉伸强度和非缺口冲击强度最大,GRT的最佳粒径为40目;WSF经D法预处理后,提高了该复合材料的力学性能,拉伸强度为16.3MPa,非缺口冲击强度为27.8kJ/m2。     

Surface Properties for Blended Films of Poly(methylmethacrylate) and Terpolymers Composed of Methylmethacrylate, Methoxypoly(ethyleneglycol-methacrylate) and Poly(dimethylsiloxanemethacrylate)

Terpolymers composed of methylmethacrylate (MMA), poly(dimethylsiloxanemethacrylate) (PDMSMA) and methoxypoly(ethyleneglycolmethacrylate) (MPEGMA), which have blood compatibility, were blended with poly(methylmethacrylate) (PMMA) in order to improve their mechanical properties. It was expected that low surface free energy components such as the poly(dimethylsiloxane) (PDMS) and methoxy groups of terpolymer would predominate at the blend surface. The adsorptions of PDMS to the blended surfaces were confirmed via X-ray photoelectron spectroscopy (XPS). A large contact angle hysteresis was observed for the blended films via a dynamic contact angle. Advancing contact angles for blended films showed the same values as that of the silicone. The receding contact angles for those blends incorporating PDMSMA-rich terpolymer showed high values and decreased with hot water treatment, while MPEGMA-rich terpolymer blended films exhibited low values and maintained those values after hot water treatment. Adhesion tension relaxations for these blended films were also observed. These phenomena were interpreted to be caused by the reorganization of a hydrophobic segment to the polymer surface or hydrophilic segment to the water/polymer interface so as to decrease the surface or interfacial tension, respectively. Although the mechanical properties slightly decreased with blending of these terpolymers, the blended films could be applied for various practical uses.     

Mechanical properties and rheological behavior of PVC blended with terpolymers containing N-phenylmaleimide

Three kinds of terpolymers containing N-phenylmaleimide (PhMI) were synthesized by emulsion polymerization. The terpolymers were used as heat-resistant modifiers, and acrylic-core/shell (ACR) was used as an impact modifier in blends with PVC. The mechanical properties and rheological behavior of the blended systems were determined. The results showed that the mechanical properties of the blends improved with increasing terpolymer content and that the apparent melt viscosity of the blends decreased with increasing terpolymer content. When 8 phr of ACR was added to the blended system, the mechanical properties and the apparent melt viscosity were greatly improved.     

Decorated wood fiber/high density polyethylene composites with thermoplastic film as adhesives

It is difficult for wood fibers/high density polyethylene (WF/HDPE) composites to laminate with poplar (Populus tomentosa) wood veneer due to its nonpolar and imporous surface. In present study, four types of thermoplastic films, include two sorts of chlorinated polypropylene (CPP32 and CPP22) film and a mixture film of maleic anhydride grafted polyethylene (MAPE) and HDPE, were developed to glue poplar wood veneer onto WF/HDPE composite board under heat-pressing. The intermediate layer has well water resistance when used aforementioned films. Optical microscopy and scanning electron microscopy (SEM) results show that CPP32 with higher melt flow rate had the higher permeability into poplar wood and fitness with WF/HDPE surface than CPP22; accordingly, the bonding strength of CPP32 was higher than CPP22. MAPE/HDPE film formed the strongest bonding layer for the high compatibility with the WF/HDPE surface which confirmed using SEM, and the covalent bonding between the poplar veneer and MAPE were confirmed using fourier transform infrared (FTIR). Compared to the high heat-press temperature of MAPE/HDPE, CPP32 has the lower processing temperature and acceptable bonding strength. CPP32 and MAPE/HDPE film both suited as the bonding intermediary to substitute traditional adhesive to manufacture veneered wood-plastic composite boards.     

耐蒸煮复合袋用胶粘剂的复合工艺性能

用所研制的蒸煮胶 ,将聚酯薄膜、铝箔、流延聚丙烯薄膜经不同干复工艺制成袋。分别装入蒸馏水 ;4 0℃饱和食盐水 ;辣椒酱、番茄酱和 3%醋酸质量比为 1∶1∶1;色拉油、番茄酱和 3%醋酸质量比为1∶1∶1及牛肉。经 135℃、30min蒸煮后 ,将袋裁成 15 0mm× 15mm的样条 ,用Instron 1185型万能材料试验机测试Al/CPP剥离强度。结果表明 :不同干复工艺影响Al/CPP强度的粘接强度和耐蒸煮性 ,尤其是胶粘剂的配比和涂胶量。其他工艺条件如干燥温度、复合温度和压力、熟化温度和时间也应严格控制。     

聚丙烯高档流延膜专用料的开发应用

聚丙烯流延膜是一类十分重要的薄膜品种。主要介绍了2008年茂名石化聚丙烯高档流延膜专用料CP9008的生产开发及应用情况。结果表明在海蒙特环管工艺生产高乙烯、高熔融指数产品是可行的。目前我们开发的CP9008热封温度为120℃-126℃,比以往的国内产品热封温度降低了10℃-20℃,但较进口料还是偏高。     

升温淋洗分级研究聚丙烯流延膜专用料的微观结构及热学表征

采用升温淋洗分级技术分离了2种聚丙烯流延膜(CPP)专用料(CPP1、CPP2),通过红外光谱仪、差示扫描量热仪和高温凝胶色谱对2种样品的链结构、熔融和结晶行为进行了表征,确定了产品各级分的分子结构信息.结果表明,对于低温(<100℃)级分,CPP1样品中其含量为9.29％(质量分数,下同),CPP2样品中其含量为26...     

CPP/VTES/St接枝共聚物的合成与性能

以二甲苯为溶剂,过氧化苯甲酰(BPO)为引发剂,采用乙烯基三乙氧基硅烷(VTES)和苯乙烯(St)为接枝单体,自由基溶液聚合法改性氯化聚丙烯(CPP),制得接枝共聚胶黏剂。并考察了聚合单体用量及配比、溶剂用量、引发剂用量、反应温度和反应时间对树脂胶黏性能的影响。得到的最佳反应条件为：溶剂与CPP的质量比m(二甲苯)∶m(CPP)=2.5∶1,聚合原料配比m(CPP)∶m (VTES)∶m (St)∶m (BPO) =100∶2.4∶0.6∶0.2,反应温度95 ℃,反应时间3 h。在此条件下制备的共聚物粘接聚丙烯材料和钢的剪切强度分别达3.4 MPa和7.7 MPa。