LDPE耐候棚膜专用料2F0.4B的研制与开发

通过光稳定剂的选择及浓度的确定。复配抗氧剂体系的研究。开发生产了低密度聚乙烯耐候棚膜专用料2F0.4B,并对产品进行了性能考核，棚膜大田应用试验。结果表明：2F0.4A-1的力学性能，耐老化性能最佳。适宜作为该专用料的基础树脂；聚合型受阻胺光稳定剂B的光稳定效果最好；膜厚0.10mm时，光稳定剂B的最小加入量0.20%；膜厚0.08mm时，光稳定剂B的最小加入量0.22%；选择合理的复合抗氧剂体系可以获得良好的抗热氧老化以及抗背板效应；含相同助剂，厚度不同（0.06,0.08,0.11mm)的棚膜老化前期差异不明显。老化后期较薄的膜力学性能衰减迅速。     

耐候棚膜专用料LDPE2F0．4B的研制与开发

从光稳定剂的选择及浓度的确定，复配抗氧剂体系的研究，LDPE2F0．4B的工业化生产，产品性能考核，棚膜大田应用实验等方面好LDPE2F0．4B的研制与开发工作。     

聚合型受阻胺光稳定剂在温室覆盖薄膜中的应用研究

以聚合型受阻胺光稳定剂Uvinul 5050H为主，辅以新型抗氧剂AOD组成农用聚乙烯（PE）棚膜防老化体系。大田应用实验表明，该体系的耐候性能优异。其中采用0．3％Uvinul 5050H的60μm厚PE单层薄膜能够在大田应用12个月以上；含0．3％Uvinul 5050H的100μm厚PE单层薄膜能够在户外使用18个月以上。含Uvinul 5050H的园艺玫瑰生产专用膜，在很好的管理和较少使用硫磺熏蒸的条件下能够使用12个月。     

聚乙烯滚塑专用料的研制

介绍了聚乙烯共混改性制备滚塑专用的方法，讨论了添加不同品种、不同含量抗氧剂对专用料加工稳定性能和长期热氧老化性能的影响，添加不同呈光稳定剂对专用料耐光老化性能的影响。另外，还分析了专用科研磨后粉料的性能。经国内多家主要滚塑厂及生产应用表明，专用料的性能指标与Ｕ．Ｃ．ＣＤＮＤＢ７１４８相当，完全能够满足国内滚塑厂家的要求。     

农用聚烯烃棚膜防老化体系的持久性验证

简要分析了国内农用聚烯烃防老化棚膜存在的问题，通过东北和西南地区试验验证了光稳定剂（6911）/抗氧剂（B215）防老化体系对聚烯烃棚模的防老化持久性效果。     

抗紫外性能的研究

研究了用添加结晶控制剂和光稳定剂的方法改善N*PP(A)纤维拉伸性能和抗紫外性能。结果表明,高等规度N-PP(A)纤维的力学性能优于低等规度N-PP(B)纤维,N-PP(A)纤维的抗紫外性能优于普通PP(3702)纤维;添加的结晶控制剂(0．1％)使N-PP(A)初生纤维的拉伸性能变好;光稳定剂A的加入(0．25％)使N-PP(A)纤维抗紫外性能显著提高,户外老化1344小时后,强度仅下降5．5％,明显优于试验所用涤纶。抗紫外N-PP(A)纤维(含抗氧剂和光稳定剂)具有优良的力学性能,特别是加入少量结晶控制剂的抗紫外N-PP(A)纤雏,其环扣强度没有明显降低。     

农用棚膜耐老化体系开发应用进展

综述了农用棚膜耐老化体系发展概况 ,重点阐述了高分子量聚合型受阻胺光稳定剂与复合型抗氧剂、复合聚合型受阻胺光稳定剂与复合抗氧剂组成的聚烯烃棚膜耐老化体系及其应用效果 ,简要介绍了抗农药型受阻胺光稳定剂开发应用情况 ,并对光学性能稳定化的研究提出了看法。     

抗氧剂和光稳定剂对线形低密度聚乙烯氙灯老化的稳定作用

采用氙灯老化的方法研究了抗氧剂1010,168与光稳定剂622对线形低密度聚乙烯(PE-LLD)的影响，并通过拉伸性能测试和凝胶渗透色谱分析对老化前后PE-LLD的性能和结构进行了研究。结果表明，未添加抗氧剂、光稳定剂的PE-LLD经氙灯老化3d后断裂伸长保留率小于50%，单独添加0. 15份抗氧剂1010,168或光稳定剂622 , PE-LLD断裂伸长保留率小于50%时，需氙灯老化的天数分别为7,6和15 d。抗氧剂1010,168与光稳定剂622复配使用时，对PE-LLD的杭老化性有明显的协同效应。     

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。     

聚合型受阻胺光稳定剂Chimassorb 944在中国农用棚膜中应用试验研究

本文叙述了聚合型受阻胺光稳定剂Chimassorb944商品简介以及有其一定含量制成的棚膜进行氙弧灯人工加速老化、自然气候曝露和实地扣棚试验。并且与中国目前常用的受阻胺光稳定剂GW540和与镍螯合物光稳定剂2002复配物进行比较。试验结果表明，含0．2％Chimassorb944的棚膜，在广州大气老化试验18个月，断裂伸长保持率为50％；在大连实地扣棚试验18个月，断裂伸长保持率为52％。     

HALS stabilization of LDPE films used in agricultural applications

The mechanism of stabilization of low density polyethylene (LDPE) films used in agricultural applications with hindered amine light stabilizer (HALS) has been studied under the influence of natural weather for 750 d. The structural modifications in the exposed films were monitored by Fourier transform infrared spectroscopy (FTIR), while the examination of the surface behavior was performed by scanning electron microscopy (SEM). Finally, the stability of the material was evaluated by measuring the percent elongation at break. The performance of HALS in the films was analyzed through a comparative study carried out on unstabilized LDPE samples exposed to the same weathering conditions for 170 d. The FTIR results have shown that HALS reduces significantly the rate of formation of ketone groups in the exposed films due to deactivation of the excited ketonic carbonyls. This indicates the role of HALS to prevent the occurrence of Norrish I and II reactions. On the other hand, the development of vinyl groups at 909 cm^–1 during the exposure period of 750 d is attributed to the photolysis of the ester group of the HALS localized at 1 734 cm^–1 in the film and the photooxidation of the polymer. The decrease observed in the ester band suggests the loss of the stabilizer. For the unstabilized LDPE film, the results have revealed a fast increase in both ketonic and vinyl groups attributed mainly to Norrish II reactions. This resulted in chain scission responsible for both the rapid drop in elongation at break and the considerable deterioration of the surface of the exposed film. On the contrary, the presence of HALS in the film resulted in a large retention of the elongation at break. Moreover, SEM analysis reveals the role of HALS to prevent the surface damage by reducing the number and size of microcracks.     

Kinetic study of hindered amine light stabilizer photografting in low density polyethylene films under natural weathering conditions

The photografting kinetic of a hindered amine light stabilizer (HALS) was studied in low density polyethylene (LDPE) films under natural weathering conditions. The HALS (PBH‐3) was added to the polymer at a concentration of 0.3% (w/w). The photografting kinetic of polymer bound HALS (PBH‐3) was determined by direct spectroscopic measurements through the absorption band area of the stabilizer centered at 308 nm in the UV spectra and 1605 cm^?1 in Fourier transform IR (FTIR) spectra, which correspond to benzylidene malonate ester and benzylidene malonic groups, respectively. In parallel, measurements were carried out on the free PBH‐3 content after chloroform extraction of the photostabilizer from the polymer matrix by means of UV and gas chromatography methods. The results showed that in natural weathering the grafting of PBH‐3 occurred in the LDPE film after very short exposure times of 127 and 168 h as determined by UV and FTIR, respectively. Moreover, the curves describing both the photografting and the free HALS kinetics exhibited similar profiles. The mechanism of photografting implies a rapid photoreaction between the methylenic double bond of the stabilizer and the macroalkyl radicals of the polymer, resulting in formation of polymer‐bonded aminyl derivatives of the stabilizer. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1524–1532, 2002; DOI 10.1002/app.10492     

各类稳定剂对聚乙烯薄膜光氧老化的稳定作用

研究了不同光稳定剂和抗氧剂及其配合使用、光稳定剂含量对聚乙烯薄膜耐光氧老化性的影响。结果表明：在各类光稳定剂中、受阻胺类稳定剂的效果最好;紫外线吸收剂与受阻胺配合使用可使膜的耐老化性有所提高;各类抗氧剂对聚乙烯膜的耐光氧老化性没有不利影响;光稳定剂含量增加,薄膜耐老化寿命提高。     

线性低密度聚乙烯的稳定性

本文阐述薄膜厚度、共混比例、熔体指数、稳定剂对LLDPE及LLDPE／LDPE共混物薄膜的光老化性、热稳定性和加工稳定性的影响。     

高分子量受阻胺光稳定剂BW-10LD

已工业化生产的高分子量受阻胺光稳定剂ＢＷ１０ＬＤ的热稳定性、耐抽提性和卫生安全性明显优于ＧＷ５４０。介绍ＢＷ１０ＬＤ与其它防老化助剂配合在聚乙烯膜中的应用情况,试验表明ＢＷ１０ＬＤ／ＰＬ１０并用体系可以替代ＧＷ５４０／２００２。     

BW-10LD/PL-10防老体系在不同比例LDPE/LLDPE膜中的应用

高分子量受阻胺光稳定剂ＢＷ－１０ＬＤ与亚磷酸酯ＰＬ－１０配合的防老体系在不同比例的ＬＤＰＥ／ＬＬＤＰＥ膜中应用时,其耐老化性能是有差异的。     

HALS及其在涂料中的应用

简介了位阻胺光稳定剂(HALS)的作用原理及涂料工业中常用HALS的结构及性能。     

Beurteilung von hals-verbindungen

QUALIFICATION OF HALS COMPOUNDS A complex method of examination has been developed suitable for the qualification of light stabilizers; by this method, according to experience, the efficacy of HALS compounds can be extensively and expediently characterized. Several light stabilizers of the HALS-type were examined and qualified, used alone or together with a UV-absorber. It has been found that, when selecting the appropriate structure for a given polymer, the weatherability of polyolefine foils is effectively increase to six-eightfold; the increase is even tenfold when the stabilizer is combined with a benzophenone-type compound. As a utilization of these experiences, a contract with the industry, led to the production of an LDPE based agricultural foil with a life-time of several years.     

高透明LDPE树脂的开发

以低密度聚乙烯18 D为基础树脂,通过添加的聚丙烯PP 2,改善了18 D的透明性和力学性能,制得高透明树脂SY-1715 F。当PP 2的加入量为7％时,PP 2与18 D的相容性最佳,薄膜雾度小于10％,横、纵向拉伸强度均大于16．0 MPa,横、纵向断裂伸长率均大于400％。加工应用试验表明,SY-1715 F适合吹制透明的轻包装薄膜、防寒膜和育秧膜等。     

Mitteilungen/Announcements

Mechanical recycling of thermoplastics for high value applications is directly associated with restabilization. The state of the art of processing-, long term heat- and light stabilization of recyclates in different polymers (e.g. PP, PP/EPDM, HDPE, LDPE, PS, PVC and various blends) with examples from packaging, distribution, automotive and construction industry is shown. Because of predamage and impurities, recyclates degrade faster and differently compared with virgin polymers and, therefore, specially designed stabilizer systems are required according to the previous damage, subsequent application and type of polymer. Recommendations for restabilization include combinations of phenolic antioxidants and phosphites as well as HALS compounds or “Recyclostab” stabilizer systems.