Polycarbodiimide crosslinkers

Polycarbodiimides are very efficient crosslinking agents for carboxylic group containing polymers in water, such as polyurethanes, polyacrylates and latexes. They are an environment friendly replacement for the former frequently used polyaziridines and in particular they are non-mutagenic. A great step forward in the development of crosslinkers are the polycarbodiimides containing additional functional groups which contribute to the crosslinking. At applying the polymers in water together with these polycarbodiimides an additional inter-polymer network is formed by the additional functional groups. As a result the film properties, such as the film strength, water and chemical resistance, abrasion properties, of the obtained film are enhanced.     

有机铬交联聚合物驱油剂的研制及矿场应用

为改善聚合物驱油效果,研制了ＸＬ系列有机铬交联剂ＸＬ－１和ＸＬ－２,研究了ＨＰＡＭ／ＸＩ交联体系的配方,对该配方体系的性能进行了评价,开展了矿物试验。     

制备延迟交联耐高温硼压裂液的途径

讨论了耐高温的延迟交联硼交联半乳甘露聚糖植物胶压裂液的制备途径，研制了三大类共六种添加剂：ｐＨ控制剂ＭＯ，缓溶硼矿物交联剂ＢＣ－Ｏ和ＢＣ－Ｗ，有机络合硼交联剂ＢＸ－Ｔ、ＢＸ－Ｏ和ＢＸ－Ｃ，介绍了使用这些添加剂的植物胶硼冻胶压裂液的延迟交联特性和耐温性。     

胶态分散凝胶驱油技术的研究与进展

本文详细介绍了新型凝胶驱油技术及其在油田的应用。通过与常规聚合物驱油技术和堵水技术的对比，论述了该方法优于现有驱油方法的特点；针对胶态分散凝胶的特殊结构，逐一讨论了现有的各种交联剂体系制备胶态分散凝胶的方法。该项技术已有２９例先导试验，成功率为６６％。     

Optimization of acrylic polyols for low VOC two-component water reducible polyurethane coatings using tertiary isocyanate crosslinkers

Polyol development is critical in order to develop a two-component waterborne polyurethane coating that can attain a 250 g/l VOC while maintaining performance requirements. This paper discusses a statistical study to develop a 250 g/l, two-component water reducible polyurethane coating using a tertiary isocyanate crosslinker with dry times and reactivity equivalent to a two-component solventborne system. The effects of acrylic molecular weight, glass transition temperature (T_g), and hydroxyl concentration on viscosity and dry time have been analyzed and statistical models identified that describe the relationships between these experimental factors and responses. Contour plots show tradeoffs between obtaining a low viscosity resin and maintaining fast dry time of the applied formulation. The data from the statistical study suggests that it is difficult to achieve the overall performance desired for an automotive refinish system with the simple four-component acrylic system investigated. The addition of either a longer chain hydroxyl functional monomer or styrene in the acrylic polyol improved the overall performance of the system. Faster cure was also demonstrated with an alternate catalyst.