抗老化PP扁丝编织土工布专用料的研制

选择国产基础树脂与稳定剂，采用碳弧灯和B型荧光紫外灯人工加速老化试验，研究了光稳定剂品种、用量、与抗氧剂的复配及色母粒、重钙母粒对专用料老化性能的影响。与添加Ciba精化公司MB218母粒的抗老化聚丙烯(PP)性能的对比及应用试验结果表明，PP扁丝编织土工布抗老化性能优良。     

ABS树脂加工及应用过程老化性能的表征方法

讨论了ABS树脂在加工、应用过程中几种老化性能的测试方法,分别针对热氧老化、热老化、光老化的特点,设计不同方法表征ABS树脂的老化性能。结果表明,ABS树脂的老化主要与温度、氧气和光照有关,采用80℃空气加速老化方法能够快速表征ABS树脂常温使用条件下的稳定性能;反复挤出测试树脂颜色变化能够评价ABS树脂加工稳定性能;对比注塑过程中物料高温长时间停留的色差,能够表征ABS树脂注塑加工过程稳定性能;紫外光老化对ABS树脂的光老化性能评价快速有效。     

四溴双酚A双(2,3-二溴丙基)醚阻燃V-2聚丙烯材料光稳定化研究

采用氙灯老化仪对四溴双酚A双(2,3-二溴丙基)醚阻燃V-2聚丙烯材料进行光老化,通过测色仪测试样品色差变化,评估材料的紫外老化性能。系统研究了不同钛白粉、抗氧剂、光稳定剂对材料紫外老化性能的影响。优选最佳配方与国外同类材料进行耐候性能及力学性能变化对比。     

提升超纤革聚氨酯涂层耐光老化性能的研究

按照ISO 105-B06:2020(E)测试方法对超纤革聚氨酯涂层的耐光老化进行了研究，分析了涂层树脂、固化剂、涂层颜料和耐光老化助剂对涂层耐光老化的影响，提出了提升超纤革聚氨酯涂层耐光老化性能的方法。研究表明，在涂层树脂方面使用脂肪族聚氨酯替代芳香族聚氨酯可以提高涂层耐光老化性能，在涂层树脂中添加一定量的固化剂可以进一步提升脂肪族聚氨酯涂层的耐光老化性能；在颜料方面，采用无机颜料替代有机颜料可以得到耐光老化性能更优的涂层；而在涂层中添加耐光老化助剂，能提升涂层的耐光老化性能，但存在助剂迁移到涂层表面的风险。     

抗氧剂1790对PP管材专用料的加工稳定性及高温热氧老化效能的评价

采用精炼加工、流变试验及长期热氧老化试验方法对抗氧化聚丙烯(PP)体系进行加工稳定性及抗热氧化效能评价,比较了抗氧剂1790及1010对PP动态热剪切老化和静态热氧老化性能的影响。结果表明,抗氧剂1790可以很好地改善PP树脂的加工性能和热稳定性能,添加抗氧剂1790的PP经150℃、2000 h热老化后,拉伸强度保持125%,伸长率保持80%。     

管材专用PPR树脂的热氧稳定性能

采用热重分析、转矩流变实验、差示扫描量热法和热老化拉伸实验研究了五种管材专用无规共聚聚丙烯(PPR)的热氧稳定性能。结果表明:自然存放PPR树脂的时间延长,其在更低温度下易发生分解,也会降低加工稳定性能;中试生产的PPR树脂在高剪切作用下的热氧稳定性能优于其他PPR树脂;国产两种PPR树脂的热氧稳定性能均优于进口树脂,其氧化诱导期分别达55.5,45.9 min;中试生产的PPR树脂的抗热氧老化性能相对更加稳定。     

国内简讯

国产间歇液相本体法聚丙烯树脂专用中和稳定添加剂(NSA) 最近开发成功一种完全适用于小聚丙烯树脂专用的中和稳定添加剂(NSA),其主要功能如下: 1.NSA添加剂对高含氯量的小聚丙烯树脂具有明显的防腐蚀和防热氧老化功能,不需要再添加其它助剂,因此对其树脂的成本影响不大。2.NSA添加剂对高含氯量的小聚丙烯树脂能有效     

受阻胺光稳定剂与紫外吸收剂协同改进ABS树脂抗光氧老化性能研究

对比研究了不同类型的紫外光吸收剂(UVA)与受阻胺光稳定剂(HALS)光稳定剂协同改善ABS树脂抗光氧老化性能的效果。评价了ABS树脂样品在自然光老化条件下,黄色指数、聚丁二烯(PB)橡胶相1,4反式结构中C-H的IR吸收指数和光氧化产生的C=O的IR吸收指数、洛氏硬度及光泽度随时间变化情况。结果表明,HALS光稳定剂与草酰胺类UVA表现出较理想的协同作用,可以使ABS树脂在自然光老化6个月后黄色指数保持稳定不变。     

紫外光固化导电胶的老化性能研究

以环氧丙烯酸树脂和聚丙烯酸树脂,铜粉和镀银铜粉制备了四种不同品种的紫外光固化导电胶。对导电胶的耐热老化性能和时间老化性能进行了研究,发现镀银铜粉导电胶的老化性能较好,耐热老化温度可以达到200℃,在60d的老化期内导电性仍在10-4Ω．cm数量级,导电胶性质稳定。     

不同偶联剂改性白炭黑填充聚丙烯抗冲击性能的研究

聚丙烯拥有良好的力学性能、机械性能、物理和化学稳定性能。但与此同时聚丙烯制品在低温冲击强度较低,耐寒性差,在使用的过程中容易受光、热、氧化作用而产生老化现象,易燃烧等。该研究主要目的是用不同偶联剂改性白炭黑填充聚丙烯获得一种性能优良的聚丙烯复合材料。同时确定不同偶联剂的种类及含量、改性后白炭黑填充聚丙烯的质量比对复合材料性能的影响。     

光稳定剂JC—568在硬聚氯乙烯中的光稳定作用

光稳定剂JC—568用于硬聚氯乙烯,适用于一般加工要求,表现出明显的光稳定作用。聚氯乙烯异型材经6000h老化后,各项指标满足GB/T8814—2004要求。     

阻燃PP纺粘无纺布的性能研究

研究了阻燃母粒法和整理法制得的阻燃PP纺粘无纺布的力学性能、热性能和阻燃性能。结果表明:阻燃母粒法制得的阻燃PP纺粘无纺布的断裂强力与PP纺粘无纺布的接近,但断裂伸长率要低,后整理法制得的纺粘无纺布的力学性能与PP纺粘无纺布的接近;两种方法制得的阻燃PP纺粘无纺布的热性能均优于PP纺粘无纺布,在1000℃左右时,有24.0%～33.2%的炭残渣,成炭性较好;两种方法制得的阻燃PP纺粘无纺布的阻燃性能良好,其中用阻燃剂B整理后的PP纺粘无纺布其阻燃效果优于阻燃剂A整理的PP纺粘无纺布。     

Performance of spalling resistance of high performance concrete with polypropylene fiber contents and lateral confinement

This paper presents an experimental study on the spalling resistance of high performance concrete with polypropylene (PP) fibers and fabric or sheet material for lateral confinement subjected to fire. According to the test results, spalling occurred on all specimens that did not contain PP fiber in the concrete mixture. However, spalling did not occur on specimens containing PP fibers above 0.05% by volume. A metal fabric showed beneficial effect on spalling resistance, but glass or carbon fiber fabrics do not show the same effect on the spalling resistance due to reduction of bond strength at high temperatures. Spalling did not occur on all specimens in which PP fibers and metal fabric were applied at the same time, and hence spalling resistance performance was significantly improved. The residual compressive strength was maintained at about 90% of its original strength, and this can be considered as an improved performance against fire damage.     

利用等离子体并接枝麦芽糖提高聚丙烯布的亲水性

为改善聚丙烯(PP)布的亲水性,先利用等离子体(空气,O2)预处理PP布使其表面引入反应性官能团;预处理之后,所引入的反应性官能团在架桥剂的存在下与麦芽糖反应,从而提高PP布的亲水性。试验所使用的架桥剂是乙二醇二缩水甘油醚(EGDE)和异氰脲酸三缩水甘油酯(TGIC)。结果表明:麦芽糖被成功接枝到PP布的表面,改性后PP布的亲水性在一定程度上得到了改善,并且在一定范围内能够被活性染料染色。     

Fabrication of deodorizing fabric by grafting of metal phthalocyanine derivative onto nonwoven polypropylene fabric

Fabrication of deodorizing fabric was tried by grafting metal phthalocyanine derivative, a catalytic deodorant, onto polypropylene (PP) nonwoven fabric. Fe(III)-4,4′,4″,4‴-tetra carboxamide phthalocyanine (Fe-TCMP) was synthesized. The Fe-TCMP showed high-deodorizing performance when tested for the elimination of 2-mercaptoethanol, an index material for bad-smelling compounds. The Fe-TCMP was converted to Fe(III)-4,4′,4″,4‴-tetracarboxylic acid phthalocyanine (Fe-TCAP) by hydrolysis to have carboxyl groups. It was chemically grafted on the surface of PP nonwoven fabric, which was surface modified to have amine groups with diaminocyclohexane (DACH) plasma. Such fabricated deodorizing fabric showed high-deodorizing performance for 2-mercaptoethanol. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 839–846, 2001     

PP降解树脂性能变化及其应用

介绍了HIMONT工艺生产的均聚PP及嵌段共聚PP降解性能的变化.对于均聚产品,其在纺丝及无纺布的生产作了描述;对于共聚产品,在薄壁制品中的应用做了描述.     

Tailoring double-layered fibrous mat of modified polypropylene/cotton fabric for the function of directional moisture transport

It has been widely acknowledged that the moisture (sweat) management in the textile is a crucial performance to adjust human comfort. Herein, a double-layered fibrous mat of modified polypropylene (PP)/cotton fabric for the function of directional moisture transport was reported. The PP fibers were deposited on the surface of cotton fabric via melt-electrospinning to form as-prepared fibrous mat, wherein the PP mat was used as the inner layer and the cotton fabric acted as the outer layer. The as-prepared fibrous mats were modified by means of plasma treatment and grafting hydrophilic groups for the sake of converting natural hydrophobicity of PP fibers into moderate wettability. After these treatments, sweat can be transport from the inner layer to the out layer rather than accumulating on the surface of the PP layer, while the capillary action of the cotton fabric on sweat was further enhanced. The directional moisture transport was systematically characterized by a moisture management tester and the experimental results exhibited remarkable accumulative one-way transport index (1,103.1%), outstanding overall moisture management capacity (0.91) within 120 s and high water vapor transport rate (11.3 kg d⁻¹ m⁻²). Besides, the obtained fibrous mat also provided decent wearability, showing the great application prospects in the moisture (sweat) management of textiles.     

聚丙烯无纺布预辐射接枝改性及胺化研究

采用丙烯酸(AA)、二乙烯三胺(DETA)依次对聚丙烯(PP)无纺布进行预辐射接枝改性及胺化处理,研究了接枝反应及胺化反应的影响因素,并用红外光谱对产物进行表征。结果表明:随着AA用量的增加,接枝率呈先增长后下降趋势;随着反应温度的升高,反应时间的延长,接枝率增加;随着接枝率的增大,胺化反应温度的升高及反应时间的增加,胺化率增加。接枝反应温度为95℃,25 mL AA与无纺布反应2 h,接枝率可达到276%;接枝率为250%的无纺布与50 mL DETA反应7 h,胺化温度205℃,胺化率可达到73%。红外光谱分析表明,经辐射接枝及胺化处理后的PP无纺布有胺基基团。     

介质阻隔空气等离子处理聚丙烯无纺布的研究

使用介质阻隔空气等离子技术(DBD)对聚丙烯(PP)无纺布进行处理,以改善PP无纺布的润湿性。扫描电镜分析表明:经DBD处理后,PP无纺布表面有明显的刻蚀和凸状沉积物,润湿性得到改善,随DBD处理功率的增大,PP无纺布润湿性相应增强。     

Mechanical and electret properties of polypropylene unwoven fabrics reinforced with POSS for electret filter materials

A novel polypropylene/Polyhedral oligomeric silsesquioxanes (PP/POSS) composite unwoven fabric with permanent electret was prepared through melt-blown process with corona charging. Field-emission scanning electron microscope (FESEM) and wide-angle X-ray diffraction (WAXRD) were employed to investigate the morphology of the composite fibers and the distribution of POSS nanoparticles on the surface of the fibers, respectively. POSS acted as nucleating agent and accelerated the crystallization process during nonisothermal cooling. The utmost stable charge density of PP/POSS melt-blown unwoven fabric was improved by 78.4% compared with the neat PP unwoven fabric. The maximum value of collection efficiency measured by monodisperse polystyrene aerosol (PSL) (particle size: 0.3 μm) collection could reach 97.36% for PP/POSS composite melt-blown unwoven fabric, which improved by 9% compared with neat PP melt-blown unwoven fabric. Moreover, both stress and elongation at break of the PP/POSS melt-blown unwoven fabrics were improved compared with PP unwoven fabric.