时效稳定型高收缩BOPP烟膜的研究

研究了温度和时间对双向拉伸聚丙烯(BOPP)烟膜热收缩率的影响。结果表明:在生产下线的1周内,BOPP薄膜的聚集态结构处于不稳定状态,薄膜的热收缩率下降较快;夏季由于温度高,热收缩率比冬季降低速度快,特别是在1个月后,下降的幅度加大。针对此问题开发出一种时效稳定母料并应用于高收缩烟膜,取得了良好的效果。在明显提高烟膜热收缩率的同时,改善了热收缩率的稳定性,特别使夏季高温下烟膜的热收缩率有较大比例的提高,钝化了热收缩率对温度的敏感性。研究表明该母料对烟膜的力学性能、光泽度、雾度、热封性能、爽滑性能以及加工性能没有负面影响.     

DMDBS成核改性聚丙烯抗菌薄膜的研究

以二(3,4-二甲基二苄叉)山梨糖醇(DMDBS)为成核剂,油酸酰胺改性载银磷酸锆为抗菌剂,聚丙烯(PP)为基体树脂,制备了成核剂母粒、抗菌剂母粒和PP抗菌薄膜,并对PP抗菌薄膜的抗菌性能、光学性能及力学性能等进行了研究。结果表明:经DMDBS改性的PP抗菌薄膜,球晶尺寸减小,结晶密度增大,结晶温度提高;含0.2%DMDBS和0.8%改性载银磷酸锆的PP薄膜的纵、横向拉伸强度分别为49.92、33.42MPa,透光率为88.5%,雾度为3.0%,对大肠杆菌和金黄色葡萄球菌抗菌率分别为99.33%和98.35%。     

BOPP薄膜生产最佳工艺条件探讨

本文就 BOPP 生产中主要工艺条件(骤冷辊温度、纵拉伸倍数、拉伸和拉幅温度、横向定型温度以及生产线速度)对薄膜的主要性能即拉伸强度、断裂伸长率、热收缩率、光泽度和雾度的影响进行了研究,得出 BOPP 薄膜生产的最佳工艺条件。     

爽滑母料在烟包薄膜专用BOPP中的应用

采用高黏度二甲基硅油与蜡按质量比为1.5∶1.0复配成爽滑母料,并在烟包薄膜专用双向拉伸聚丙烯(BOPP)上应用。结果表明:将质量分数为10%的爽滑母料添加到表层材料制成的烟包薄膜专用BOPP,其动摩擦因数在常温条件下控制在0.25～0.26,温度为50℃时控制在0.35之内,完全能满足烟包薄膜专用BOPP的爽滑性能;其雾度小于1.5%,光泽度大于90.0%,并在30 d内薄膜雾度上升0.1%,光泽度下降0.9%,具有高光泽、低雾度,并且时效性稳定等特点;自制爽滑母料在烟包薄膜摩擦因数和光学性能上优于参比试样,其他力学性能差异不大;自制爽滑母料的使用性能超过参比试样。     

海泡石载银抗菌薄膜的研制

采用海泡石载银抗菌剂制备抗菌母料，研究了抗菌母料用量对抗菌薄膜的抗菌性能、流变性能、力学性能的影响。结果表明，当抗菌母料用量为3％（质量分数）时，抗菌薄膜具有高效、持久的抗菌性能，而流变性能和力学性能基本不受到影响。     

成核剂YS-688改性抗菌PP薄膜的研究

以聚丙烯（PP）为基体树脂,改性载银磷酸锆为抗菌剂,YS-688（二苄叉山梨醇衍生物）为成核剂,制备抗菌剂母粒、成核剂母粒和抗菌PP薄膜,研究了成核剂改性抗菌PP薄膜性能。结果表明：经YS-688改性的抗菌PP薄膜,球晶尺寸减小,结晶密度增大,结晶温度提高;含0．9％改性载银磷酸锆和0.3％YS-688的PP薄膜,其拉伸强度（纵向／横向）51．16／31．88MPa,透光率88．8％,雾度2．9％,对金黄色葡萄球菌和大肠杆菌抗菌率为99．26％和99．57％,物理力学性能和抗菌性能优良。     

纳米抗菌LDPE包装膜的研究

将处理后的纳米TiO_2加入低密度聚乙烯(LDPE)中,通过双螺杆挤出机造粒得到抗菌母料,然后将抗菌母料与LDPE混合并挤出吹制抗菌LDPE薄膜,研究了薄膜的抗菌及力学性能。结果表明:采用该工艺制得的LDPE薄膜无毒、抗菌性能良好;随抗菌母料的增加(即纳米TiO_2的增加),LDPE薄膜的纵向拉伸强度和横向拉伸强度均有增加,抗菌母料质量分数由1%增加到5%时,抗菌薄膜的纵向拉伸强度由9.2 MPa提高至14.6 MPa;拉伸断裂应变略有下降。     

CPP薄膜中成核剂用量对其性能的影响

研究成核剂A3用量对CPP薄膜光学性能、机械性能、热封性能和摩擦系数的影响,结果表明,添加0．6％－1．2％质量比A3成核剂,能使雾度在4％以下,对透明性基本无影响,能同时提高拉伸强度和断裂伸长率,热封强度提高10％左右,起始热封温度保持127℃,热粘强度无变化,摩擦系数先升后降,动摩擦系数比静摩擦系数下降更快。     

油酸酰胺改性载银磷酸锆/聚乙烯抗菌薄膜的研究

以油酸酰胺为改性剂,载银磷酸锆为抗菌剂,线型低密度聚乙烯为载体树脂,制备了抗菌母粒和抗菌聚乙烯薄膜。用吸水性测定法、红外光谱法分析载银磷酸锆的改性效果,用扫描电镜观察载银磷酸锆在聚乙烯基材中的分散情况,检测了薄膜的力学性能、透光率、透气量、抗菌率。结果表明:经油酸酰胺改性的载银磷酸锆疏水性好,在基体中分散均匀;当抗菌母粒含量为5%时,聚乙烯薄膜的纵向拉伸强度和横向直角撕裂强度略有下降,断裂伸长率、横向拉伸强度、纵向直角撕裂强度均有不同程度的提高,透光率下降3.4%,透气量提高30.18%,抗菌率达99%以上。     

BOPP薄膜生产最佳工艺条件探讨

使用加拿大SHELL公司生产的KF 6100型PP树脂,就BOPP生产中主要工艺条件(激冷辊温度、纵向拉伸倍数、拉伸和拉幅温度、横向定型温度以及生产线速度),对薄膜的主要性能即拉伸强度、断裂伸长率、热收缩率、光泽度和雾度的影响进行研究,以寻找BOPP薄膜生产的最佳工艺条件,更好地消化引进技术,使其获得最大的经济和社会效益。     

再生料对BOPP薄膜性能的影响研究

介绍了BOPP薄膜的生产流程和加工原理,根据用户需求的变化,在满足国标要求的前提下,添加不同比例再生料进行了生产,探索了再生料对BOPP薄膜物理性能的影响,主要对比了薄膜的雾度、光泽度和纵向拉伸强度的变化,为科学生产提供了依据。     

How the biaxially stretching mode influence dielectric and energy storage properties of polypropylene films

The most important polymer film used in commercial capacitors is biaxially oriented polypropylene (BOPP), which could be produced by sequentially or simultaneously biaxial orientation after the melt-extrusion. In order to disclose the influence of the stretching technique on the properties of films, the BOPP films with varied thickness were fabricated by sequential and simultaneous orientation, respectively. Compared to the sequentially biaxially stretched films, the crystal grains in the simultaneously biaxially stretched films are more isotropically dispersed. As temperature increases, all the BOPP films exhibit similar dielectric constant, and the simultaneous films have much lower dielectric loss thanks to the finer blended crystalline and amorphous phases. When the film thickness is smaller than 5 μm, the breakdown field strength, energy density and discharging time of the simultaneous films can be increased by at least 10% comparing to the sequential ones, which is very important for reducing the volume of the film capacitors. All the results suggest the simultaneously biaxial orientation mode shows significant advantages in producing thin BOPP films with better mechanical and electrical properties.     

Study on the compatibility of ethylene‐vinyl acetate copolymer/vermiculite in biaxially oriented polypropylene films

A process for preparing expanded vermiculite/ethylene vinyl acetate nanocomposites by ball milling expanded vermiculite (EVMT) in cyclohexane solution of ethylene vinyl acetate copolymer resin (EVA) was presented, and the influence of EVA/EVMT nanocomposites on mechanical, barrier performance of modified biaxially oriented polypropylene (BOPP) films was discussed in this article. By the process, the EVMT is intercalated and exfoliated to obtain a kind of EVMT/EVA nanocomposite, in which EVA serves as both intercalating agent into EVMT and compatibilizer between EVMT and polypropylene (PP); so, when EVMT/EVA was melt blended with PP, platelets of vermiculite can be exfoliated easily and dispersed relatively well in the PP matrix. Compared with original (nonmodified) BOPP, when EVMT loading ranged from 0.1% to 0.5%, both strength and toughness of the modified BOPP films was increased. Moreover, platelets (flakes) of vermiculite dispersed in PP matrix improved barrier properties of modified BOPP films also. The improved barrier properties of BOPP films accorded with Nielsen model. POLYM. COMPOS., 36:78–87, 2015. © 2014 Society of Plastics Engineers     

新型镀铝复合薄膜专用胶粘剂的研究

分析了影响BOPP／VMCPP型镀铝复合薄膜剥离强度的主要因素,即：BOPP和胶粘剂的界面强度;胶粘剂和VM的界面强度;VM和CPP的界面强度,以及胶粘剂的组成、分子结构、相对分子质量分布、单体残存量等,并合成了一种新型的镀铝膜和塑料薄膜复合用聚氨酯胶粘剂;讨论了胶粘剂的相对分子质量、相对分子质量分布、固化温度和时间等因素对粘结性能的影响。试验结果表明：该胶粘剂初粘力强、剥离强度高、溶剂残留量低,适用于快速复合薄膜生产线。     

羧基化VAE乳液的研究

在VAE乳液的聚合过程中,添加适量的丙烯酸等羧酸类单体,进行羧基化改性,以期改善VAE乳液对难粘材料如PET膜等的粘接性能,并便于交联改性。     

彩色双向拉伸聚丙烯胶带膜的研制

用平膜法制备了彩色双向拉伸聚丙烯（BOPP）薄膜,讨论了不同彩色母料、母料浓度对薄膜透光率的影响以及所制备彩色BOPP薄膜与国内通用BOPP彩色胶带色差的评价指标.结果表明,彩色母料PP5011A与PP5012的配合使用效果较好,按所述的配方制得的薄膜色相与国内通用彩色胶带相近,得到客户认可.     

Enhanced dielectric properties of sandwich-structured biaxially oriented polypropylene by grafting hyper-branched aromatic polyamide as surface layers

This work represents multilayer films with sandwich structure by grafting hyper-branched aromatic polyamide (HBP) on both sides of biaxially oriented polypropylene (BOPP) (HBP BOPP HBP). BOPP serves as the middle layer to offer high breakdown strength and HBP acts as surface layers to boost the dielectric constant. As a result, the dielectric constant increases significantly from 2.2 of control BOPP to 5.5 (almost increased 1.5 times) after grafting 2.06 μm HBP surface layers, while the dielectric loss still remains at a very low level (<0.03). In addition, all HBP BOPP HBP sandwich-structured films show higher charge energy density than that of unmodified BOPP. For instance, the discharge energy density of HBP BOPP HBP (1-20-1) film is up to 2.38 J/cm³ at an applied electric field of 400 kV/mm, which increases about 36% over that of pure BOPP (i.e., 1.75 J/cm³). Meanwhile, charge–discharge efficiency retains about 90%. This work offers a simple strategy to fabricate polymer-based high performance dielectric composites.     

Control of well‐defined crater structures on the surface of biaxially oriented polypropylene film by adding nucleators

While it is common to add anti‐blocking agents to biaxially oriented polypropylene (BOPP) films for general use in order to prevent blocking against each other, the technology of crater‐like film surface roughness formed on the BOPP films without any additives is well known in the industrial BOPP film areas. Numerous studies have been reported on the crater‐like film surface roughness on the BOPP films since the 1980s, but its formation mechanism and the controlling method of the crater‐like film surface roughness are yet to be clarified. In our previous reports, we presented a new hypothesis of crater formation mechanism from a new point of view on sheet morphology and crater shape on the BOPP film surface. It was strongly influenced by the crystal grain shape in the surface layer of PP sheet. In this report, it was clarified that a nucleator has a big influence on the formation of the crystal grains in the surface layer of PP sheets and on the formation of craters. In addition, craters did not form on the BOPP films stretched from the sheet of which the skin layer with crystal grain was shaved, even though β crystal still remained. It was clarified that the crystal grain is trans‐crystal from the observation using TEM. Therefore, it is concluded that the existence of β crystals in the surface layer of PP sheets is not essential in order to produce craters on BOPP films, but trans‐crystals are necessary to form the craters. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3555–3564, 2013     

增刚剂在BOPP收缩膜中的应用研究

探讨了生产BOPP收缩膜时,在芯层加入不同比例的氢化石油树脂增刚剂后对生产工艺条件和产品性能的影响,从而通过正确使用增刚剂来控制所要求的薄膜品质。     

Synthesis of waterborne polyurethane ink binder with high T-peel strength and its application in biaxially oriented polypropylene film printing

In order to improve adhesion properties of waterborne polyurethane (WPU) inks on biaxially oriented polypropylene (BOPP) films, herein, a liquid polyester polyol BY3003 with long-branched aliphatic chains was used to prepare WPU latexes suitable for BOPP films printing. The application of BY3003 made the surface tension of the prepared latexes not more than 43 mN/m, while that of traditional WPU latex exceeded 55 mN/m. Accordingly, the T-peel strength of the inks made from these latexes was all above 0.8 N/15 mm. In addition, post chain extension degree, dimethylol butyric acid content, and NCO/OH molar ratio also had significantly effect on latex and film properties of WPU, especially on the T-peel strength of the corresponding inks. By optimizing these factors, a WPU latex with surface tension as low as 39.6 mN/m and adhesion fastness over 95% on BOPP film were obtained, and the T-peel strength of its corresponding ink was up to 2.05 N/15 mm, which is the highest value recorded in the literature as far as we know.