沉淀碳酸钙和滑石粉的钛酸酯偶联剂改性研究

采用钛酸酯偶联剂对沉淀碳酸钙和滑石粉进行表面改性处理,研究了改性后的沉淀碳酸钙和滑石粉的活化率和吸油值,并对钛酸酯偶联剂改性沉淀碳酸钙和滑石粉的处理工艺进行了研究.结果表明,影响改性效果的最大因素是钛酸酯偶联剂,得出钛酸酯偶联剂处理沉淀碳酸钙和滑石粉的最佳工艺条件.     

改性无机填料在复合材料中的应用

研究了未经表面处理与经钛酸酯、sbph等偶联剂表面处理后的超细填料滑石粉及碳酸钙对填充聚丙烯 (PP)体系的影响 ,测定了冲击强度、拉伸强度、硬度、熔融指数等性能的变化。结果表明 ,改性后的填充PP体系 ,其力学性能和流动性能均有所改善 ,其中用sbph改性的填充料 /PP有较高的性能价格比 ,且发现偶联剂用量在改性填充PP体系中存在最佳值     

一种新型偶联剂的应用研究

研究了新型偶联剂(XOL-4)用于不同填料的效果。选用滑石粉、CaCO_3、SBS三种不同类型的填料,以不同用量的XOL-4进行表面处理来填充树脂,考察了所得填充体系的拉伸强度、弯曲弹性模量、热变形温度等性能,同时与钛酸酯偶联剂和铝酸酯偶联剂进行了比较。     

钛酸酯偶联剂对无机填料表面改性的研究

无机填料在橡塑工业中应用广泛,其来源广,填充量大,不仅起到降低成本的作用,还可提高橡塑制品机械力学性能。但由于无机填料的极性较强,使得其与高聚物相容性较差,需要对无机填料进行表面处理,钛酸酯偶联剂是常用的表面改性剂之一。本实验对碳酸钙、滑石粉等无机填料改性前后的填充性能变化作了对比研究。     

钛酯酯偶联剂对无机填料表面改性的研究

无机填料在橡塑工业中应用广泛,其来源广,填充量大,不仅起到降低成本的作用,还可提高橡塑制品机械力学性能。但由于无机填料的极性较强,使得其与高聚物相容性较差,需要对无机填料进行表面处理,钛酸酯偶联剂是常用的表面改性剂之一。本实验对碳酸钙、滑石粉等无机填料改性前后的填充性能变化作了对比研究。     

聚烯烃填充母料的研制

以LDPE为载体,滑石粉和CaCo_3为填料,分别以钛酸酯和铝酸酯作偶联剂,对滑石粉和CaCO_3进行活化处理,制成高填充聚烯烃母料。并对其以不同的配比填充PE时的物理机械性能和流动性进行了研究。     

钛酸酯偶联剂对无机填料的改性研究

采用钛酸酯偶联剂对无机填料进行表面改性处理,并对改性后的填料的活化度和吸油值进行研究,确定了TM-S偶联剂对无机填料进行改性的最佳处理工艺.     

微晶粉增强中密度聚乙烯的研究

制备了以偶联剂改性的微晶粉填充中密度聚乙烯(MDPE)复合材料,分析了偶联剂种类、不同处理方法及填充量对增强MDPE力学性能的影响,在相同工艺条件下,与滑石粉填充MDPE进行了对比。结果表明：经钛酸酯类偶联剂湿法处理的微晶粉填充MDPE,在其质量分数为10％时．拉伸强度达到33．60MPa．显示出了较为明显的增强效果,且具有比滑石粉填充体系更好的拉伸性能,可作为一种新型增强填料。     

PP/改性滑石粉复合材料性能研究

以钛酸酯偶联剂为改性剂对滑石粉进行表面改性,然后将其填充到聚丙烯(PP)中,制成PP/改性滑石粉复合材料。考察了滑石粉用量对PP/滑石粉复合材料阻燃性能和力学性能的影响,并对比了滑石粉改性前后复合材料力学性能及阻燃性能的差异。结果表明:添加滑石粉可提高PP复合材料的阻燃性能和耐热性能。另外,未改性滑石粉的添加降低了PP复合材料的力学性能,而适量改性滑石粉的添加(≤20 phr)则使复合材料的拉伸强度和冲击强度得到提升。     

聚乙烯/矿物粉复合降解薄膜的机械性能及光降解性能

用2%钛酸酯偶联剂对滑石粉、膨润土粉粒进行表面改性,通过双螺杆挤出机将改性滑石粉和膨润土分别与聚乙烯树脂(PE)得填充母料,其中无机填料占80%;以不同比例的填充母料与PE混和,采用吹塑法制备了单一填充母料(含滑石粉或膨润土)和混和填充母料(既有滑石粉又有膨润土)的PE/矿物粉复合薄膜。研究了填充母料对PE复合薄膜的机械性能和光降解性的影响,实验结果表明:两种母料都具有较好的成膜性,对薄膜产生一定的增强减韧作用;另外,在填充母料用量一样的情况下,滑石粉母料填充薄膜的力学性能高于膨润土的,而目单一母料填充薄膜的力学性能优于混和母料填充薄膜的力学性能。在自然光照和紫外光照实验中,PE/矿物粉复合薄膜的机械性能下降和红外光谱的变化显示了滑石粉和膨润土能够极大的促进PE薄膜的降解。     

氧化锌晶须表面改性及表征

采用湿法表面化学改性法，用硅烷和钛酸酯偶联剂对氧化锌晶须(ZnOw)进行了表面改性；考察了溶剂、pH值、温度及分散时间对硅烷类偶联剂改性效果的影响，采用活化指数、接触角以及傅立叶变换红外光谱对改性结果作了表征。同时将改性后的ZnOw填充到线性低密度聚乙烯(LLDPE)中，测试了复合材料的机械性能。实验结果表明，硅烷和钛酸酯偶联剂均能用于ZnOw的表面改性，其最佳改性条件不同，获得最佳改性效果的偶联剂用量也不同。经ND-42改性的ZnOw填充到LLDPE中，复合材料的弯曲强度大幅度提高。     

多元复合高流动性聚丙烯的制备与性能

研究了滑石粉(Talc)及偶联剂用量、均聚聚丙烯(PP-H)与马来酸酐接枝物(PP-g-MAH)及PP-H对高流动性共聚聚丙烯(PP)性能的影响;比较了在填充20%Talc的共聚PP中分别添加PP-g-MAH和PP-H的复合体系力学性能及流变性能的变化规律。结果表明:钛酸酯偶联剂用量为1%(相对于Talc)时,所得Talc填充共聚PP综合性能最佳;当Talc用量大于10%时,共聚PP/Talc复合材料的拉伸强度、冲击强度、弯曲强度、熔体流动速率随Talc含量的增加而逐渐下降,弯曲模量则逐渐提高;PP-g-MAH对高流动性共聚PP的拉伸强度增强效果明显优于PP-H,PP-H则使共聚PP的熔体流动性明显下降。     

Crystallization behavior of polypropylene filled with surface-modified talc

Talc-filled polypropylene (PP) composites were prepared by extrusion in a wide composition range (0–40 wt %). To improve the affinity relation between talc and the PP matrix, we modified the talc surface with silane coupling agents. Differential scanning calorimetry investigations on test samples, prepared by injection moulding, revealed that the talc content and its surface modification had a pronounced effect on the crystallization behavior of the filled PP composites. The experimental results indicate that a talc concentration of 2 wt % strongly affects the nonisothermal crystallization process of the PP, especially when talc is silane treated Isothermal crystallization experiments on samples with minimum amounts of talc (2 wt %) revealed an improved nucleation activity with silane-treated talc. © 1996 John Wiley & Sons, Inc.     

Effect of chemical treatments on the mechanical,flow, and morphological properties of talc‐ and kaolin‐filled polypropylene hybrid composites

This study was performed with commercially available phenyl trimethoxysilane (PTMS) and neoalkoxytitanate [i.e., neopentyl(diallyl)oxytri(dioctyl)phosphato titanate (LICA 12)] as coupling agents. PTMS and LICA 12 were used to treat talc and kaolin to compare their effects with untreated fillers upon incorporation into polypropylene (PP). Single‐filler PP composites (containing either talc or kaolin) and hybrid‐filler composites (containing a mix of both talc and kaolin) were compounded in a twin‐screw extruder and subsequently injection‐molded into dumbbells. The incorporation of PTMS and LICA 12 slightly decreased the tensile and flexural properties in terms of modulus and strength but increased the elongation at break for both single‐filler and hybrid‐filler composites. There was also a significant improvement in the impact strength of the composites, particularly those treated with LICA 12. The hybrid composites, through the synergistic coalescence of positive characteristics from talc and kaolin with the aid from chemical treatment provided an economically advantageous material with mechanical properties comparable to those of the single‐filler‐filled PP composites. Further investigations on flow and morphological properties were also done to correlate the mechanical properties of the single‐ and hybrid‐filler‐filled PP composites. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

偶联剂表面改性对膨胀阻燃聚丙烯性能的影响

采用硅烷偶联剂、钛酸酯偶联剂、铝钛、铝硅复合偶联剂对无卤膨胀型阻燃剂（IFR）进行表面改性,对比了表面改性前后IFR堆积密度和休止角的变化,研究了表面改性对IFR阻燃聚丙烯（PP）分散性能、力学性能及阻燃性能的影响,并采用锥形量热仪对比了表面改性前后IFR阻燃PP的燃烧行为。结果表明,4种表面改性剂中铝硅复合偶联剂的改性效果最优;可显著改善IFR在PP中的分散性,提高了PP的极限氧指数和UL 94阻燃级别,材料的断裂伸长率提升了200 %,冲击强度提升了50 %;还可抑制IFR的析出,材料燃烧时的热释放速率及总量、生烟速率及总量下降幅度达到30 %左右。     

The influence of filler treatment on the properties of TPU/PP blends: I. Thermal properties and stability

Commercially available organosilane (3‐glycidoxypropyltrimethoxysilane (GPTMS)) coupling agent was used to treat talc in order to improve the affinity relative between the filler and the polymer in composites as well as filler and polymer in the thermoplastic polyurethane/polypropylene (TPU/PP) blends (talc content was 5 wt%). The talc particles were first modified with GPTMS and then introduced into TPU, PP as well as TPU/PP blends with different weight ratios of polymers using blending method and subsequently injection molded in a hydraulic press. The aim was to report the effect of silane coupling agent on the thermal and morphological properties of talc filled composites and blends. The results showed that the thermal properties of the TPU, PP composites and TPU/PP blends were improved with the addition of silane treated talc (higher melting (T_m), crystallization (T_c) temperatures and degree of crystallinity (χ_c)). The glass transition temperature (T_g) obtained by dynamic mechanical analysis (DMA) of the TPU soft segments in TPU/PP blends increased with the addition of untreated and silane treated talc due to lower mobility of the soft segments in TPU and better miscibility of TPU and PP. TPU/PP blends with the silane treated talc show better thermal stability than the TPU/PP blends with untreated talc. POLYM. ENG. SCI., 55:1920–1930, 2015. © 2014 Society of Plastics Engineers     

表面改性对聚丙烯/微米氢氧化镁复合材料性能的影响

研究了表面处理剂（钛酸酯和硅烷偶联剂）和原位聚合方法对聚丙烯/微米氢氧化镁（MH）复合材料的力学性能及流变性能的影响。采用DSC、SEM和毛细管流变仪对PP/MH（80/20）复合材料的性能进行了研究。结果表明：原位聚合改性后的微米MH与PP基体间的界面黏结力得到了加强,复合材料的冲击强度较填充未改性MH的复合材料提高了26.4 ％。在PP基体中添加聚合物包覆改性微米MH粒子的复合材料熔体流动速率较纯PP上升了64 ％。在相同剪切速率下,填充聚合物包覆改性MH的复合材料熔体表观黏度明显低于填充未改性微米MH的复合材料,表明聚合物包覆改性后的MH降低了其对PP熔体流动的阻碍作用,改善了PP/MH复合材料的流动性能。     

钛酸钾晶须及硫酸钙晶须改性环氧树脂

应用硅烷及钛酸酯等偶联剂对钛酸钾晶须及硫酸钙晶须进行表面处理，考察晶须对环氧树脂力学性能、工艺性等的影响。研究表明，钛酸钾晶须经硅烷偶联剂处理后，能很好地改善复合材料的性能，硅烷的表面处理效果较钛酸酯的好。钛酸钾晶须添加到环氧树脂中后，材料的弯曲强度随晶须含量增大逐渐增大，在晶须含量为8％时达到最大值，之后性能稍有下降；材料的弯曲模量随晶须添加量的增加逐渐增大，冲击强度稍有降低。体系中添加硫酸钙晶须后，材料的性能也得到一定程度的提高。硫酸钙晶须对环氧树脂工艺性的影响较钛酸钾晶须小。SEM表明，晶须经合适的偶联剂表面改性后，与树脂基体的界面粘接得到有效改善。     

An investigation on the mechanical and dynamic rheological properties of single and hybrid filler/polypropylene composites based on talc and calcium carbonate

Some results of experiments on the mechanical and rheological properties of mineral filled polypropylene were presented. Single filler and hybrid filler composites of talc and calcium carbonate (CaCO₃) were prepared in a co‐rotating twin‐screw extruder. The effect of filler type, filler content, and coupling agent on the mechanical and rheological properties of the polypropylene were studied. The coupling agent was maleic anhydride‐grafted polypropylene (PP‐g‐MA). It was found that the mechanical properties are affected by filler type, filler concentration, and the interaction between filler and matrix. The tensile strength of the composite is more affected by the talc while the impact strength is influenced mostly by CaCO₃ content. The elongation at break of PP/CaCO₃ composites was higher than that of PP/talc composites. The incorporation of coupling agent into PP/mineral filler composites increased the mechanical properties. Rheological properties indicated that the complex viscosity and storage modulus of talc filled samples were higher than those of calcium carbonate filled samples while the tan δ was lower. The rheological properties of hybrid‐filler filled sample were more affected by the talc than calcium carbonate. The PP‐g‐MA increased the complex viscosity and storage modulus of both single and hybrid composites. POLYM. COMPOS., 2009. © 2009 Society of Plastics Engineers     

玉米秸秆增强废胶粉复合材料的制备及界面改性

采用共混法制备了玉米秸秆/废胶粉复合材料,并以4种不同偶联剂(硅烷偶联剂KH 550、KH 590、Si 69和钛酸酯偶联剂HY 101)分别对复合材料进行界面改性,探讨了玉米秸秆的增强及偶联剂改性对复合材料力学性能、界面形貌和组成结构及热稳定性的影响.结果表明,玉米秸秆的加入可有效提高复合材料的力学性能.偶联剂改性处...