氨基改性有机硅微乳液的制备及应用进展

着重阐述了氨基改性有机硅微乳液的各种制备方法以及它们各自的特点。氨基改性有机硅微乳液兼具聚硅氧烷和氨基的双重性质,从而具有链段柔顺性、耐热性、润滑性、反应性和吸附性等特点。介绍了氨基改性有机硅微乳液在化妆品、织物整理、皮革涂饰、纸浆造纸和汽车抛光等方面的应用。     

建筑防水材料用硅丙乳液的研制

用A-172合成了有机硅含量3%的硅丙乳液,研究了各聚合反应工艺对性能的影响,最佳工艺为:复合乳化剂用量为单体重量的1.5%,采用氧化还原引发方式,反应温度为68~72℃,反应时间为3 h。该产品用于JS建筑防水涂料具有较好的使用效果。     

蒙脱土与有机硅共改性聚氨酯型密封胶的研究

采用2,4-甲苯二异氰酸酯(TDI)、聚醚多元醇、纳米有机蒙脱土(OMMT)、α,ω-二羟基聚二甲基硅氧烷和硅烷偶联剂为原料,制备了蒙脱土和有机硅复合改性的硅烷化聚氨酯(SPU)密封胶。研究了有机硅和OMMT用量、填料、催化剂的种类及用量对SPU密封胶力学性能的影响。采用X射线衍射和红外光谱对预聚体进行了表征,研究表明,经有机化处理的蒙脱土和有机硅复合改性的SPU密封胶具有性能互补效果,能同时提高密封胶的拉伸强度和伸长率。比纯SPU密封胶分别提高了72.5%和73.2%。     

Mg-doped poly(?-caprolactone)/siloxane biohybrids

Ionically conducting materials based on a poly(?-caprolactone) (PCL)/siloxane organic/inorganic host framework doped with magnesium triflate (Mg(CF₃SO₃)₂) were synthesized by the sol-gel process. In this matrix short PCL chains are covalently bonded to the siliceous network via urethane linkages. In this study the salt content of samples was identified using the conventional notation n, where n indicates the number of (C(O)(CH₂)₅O) PCL repeat units per Mg²⁺ ion. Xerogels with compositions ranging from n = ∞ to 1 were prepared. The only composition studied that was not entirely amorphous was that prepared with n = 1. Xerogels with n ≥ 7 are thermally stable up to at least 200 °C. The composition with the highest conductivity of the series is that with n = 34 (5.9 × 10⁻⁹ and 9.8 × 10⁻⁷ S cm⁻¹ at 24 and 104 °C, respectively).     

Studies of cyclic and linear poly(dimethyl-siloxanes): 11. Shapes of ring and chain molecules

The equilibrium shapes of cyclic and linear poly(dimethyl siloxane) (PDMS) molecules have been investigated using Flory, Crescenzi and Mark's rotational isomeric state model, together with a Monte Carlo method described previously. The principal axes of the equivalent ellipsoids have been computed and the major change on ring formation was found to be a reduction in the longest axis of the ellipsoid. This result is in agreement with previous studies of other ring molecules. The shapes of the cyclics $\text{[(}\text{CH}{}_3\text{)}{}_2\text{SiO}\text{]}{}_{\mathrm{<mtext>w</mtext><mtext>2</mtext>}}$ in the region w=20 are disc-like and this observation is related to the different bond angles at silicon and oxygen atoms. Bulk densities and refractive indices of PDMS rings are discussed in relation to the calculated molecular shapes. Histograms are used to illustrate the proportional frequency functions of the radii of gyration and their components s_x, s_y and s_z.     

自修复涂料的研制

本文研制的自修复涂料系统含有许多特点,硅氧烷单体自修复剂HOPDMA-PDES按相分离分散在介质中,而同时催化剂在微胶束中,HOPDMA与PDES不会发生反应,只有当催化剂从微胶束中破壳而出与自修复剂完全混合并固化后,自修复剂才完成任务。     

N,N,N-三(乙氧基硅丙烷)三聚氰胺用于纸质文物保护

以三聚氯氰为骨架,接枝氨基硅氧烷类物质KH-550,并将所合成产物N,N,N-三（乙氧基硅丙烷）三聚氰胺（TEPSMA）应用于纸质文物保护处理。通过加速热老化对TEPSMA处理前后纸张的pH值、抗张强度、碱残留及纸张纤维断裂率进行测定。结果表明,经过TEPSMA处理后,纸张pH值得到明显的提高（从3.2到7.7~8.7左右）,抗张强度亦从915 N/m上升到1300 N/m,且TEPSMA处理前后纸张颜色变化轻微（ΔE*=1.72）;热老化实验表明,经过TEPSMA处理后的纸张pH值能够保持在中性或弱碱性并残留一定的碱,抗张强度维持在一个比较稳定的值1200 N/m左右;对比处理前后纸张纤维素聚合度,处理后的纸张纤维纤维素聚合度下降轻微,表明纸张经TEPSMA处理后,能够显著降低纸张老化速率。     

星型羧基改性聚醚硅氧烷的合成及应用

以四甲基环四硅氧烷为原料,通过硅氢化加成合成星型中间体聚醚四甲基环四硅氧烷(DPESO),再用马来酸酐进行羧基化,制得一种星型羧基改性聚醚硅氧烷低聚体(DCPES),并采用红外光谱和核磁共振氢谱对其结构进行表征.对DCPES及氨乙基氨丙基聚二甲基硅氧烷(ASO-1 )/DCPES复配体系在棉织物上的应用性能进行的研究表明:经DCPES处理后的织物,柔软性能有所提高,静态吸水时间缩短,白度与空白样基本相同;在ASO-1用量不变的情况下,ASO-1/DCPES复配体系中DCPES含量越多,处理织物柔软度越差,白度越高,静态吸水时间越短.当氨基硅乳与DCPES水溶液质量比为1∶0.5时,被处理棉布的综合性能较好.     

Synthesis and characterization of polystyrene-acrylate/polysiloxane (PSA/PSi) core shell polymers and evaluation of their properties for high durable exterior coatings

Poly acrylic siloxane coatings are generating a lot of interest due to their high durability and superior performance properties in different applications. However, synthesis of high siloxane containing acrylic binder through emulsion polymerization is a challenge. Herein, we present a study on the synthesis and characterization of polystyrene-acrylate/polysiloxane core shell latex systems through regular seeded emulsion polymerization. Hybrid polymers have been characterized for their physical, chemical, thermal and surface properties using different characterizing techniques like FTIR, DSC, DMA, SEM, TEM, DLS and contact angle measurements. Incorporation of polysiloxane in the shell of the polymer particle was found to improve hydrophobicity and mechanical properties. Exterior paints prepared using the hybrid polymers as binders exhibited superior performance properties like weather ability and dirt pick up resistance.