道康宁XIAMETER皮革助剂

有机硅由于其特殊物性及化学结构,可通过与聚氨酯(PU)共聚反应或物理共混的方式,提高合成革及表面处理剂的一些性能,如:耐折叠、耐水解、耐磨耗、手感以及观感等;同时,有机硅还可用作生产过程助剂,起到润湿、流平、助剥离等效果。1有机硅在合成革用PU和涂饰剂中的应用     

无溶剂合成革用有机硅改性聚氨酯的性能研究

采用4种不同结构的有机硅氧烷改性异氰酸酯得到聚氨酯预聚体,作为制备无溶剂合成革面层的B组分。探讨了有机硅改性聚氨酯预聚体对无溶剂合成革面层及成品革的性能影响。结果表明:与未改性的相比,有机硅改性的无溶剂合成革面层,拉伸强度从5.73 MPa增加至7.82 MPa,断裂伸长率从342%增加至472%,吸水率从8.05%降低至3.36%,面层的热稳定性得到提高;制备的成品革柔软度从8.16提高至10.57,TaberH–221 000 g耐磨从856转增加至1 426转,合成革的剥离强度保留率有所增加。当采用PDMS–2改性得到的聚氨酯预聚体,其制备的无溶剂合成革综合性能较佳。     

有机硅改性水性聚氨酯的合成及织物整理应用

以羟丙基硅油改性二苯基甲烷二异氰酸酯(MDI)型聚氨酯合成了一种有机硅改性聚氨酯预聚体,将预聚体乳化后制备了一种有机硅改性水性聚氨酯。确定了乳液最佳配方,讨论了各工艺条件对改性水性聚氨酯整理棉织物综合性能的影响。结果表明,原棉织物、聚氨酯乳液整理和改性水性聚氨酯整理的棉织物表面粗糙度(SMD)分别为2.625、2.605和2.190,弯曲刚度B分别为0.0894、0.0869和0.0464,可见聚氨酯乳液整理前后棉织物的表面特性和柔顺性变化不大,但经有机硅改性水性聚氨酯整理后棉织物的表面特性和柔顺性则大为改善。     

端羟基有机硅改性聚氨酯树脂及合成革耐磨性能研究

为提高聚醚型聚氨酯材料耐磨性能,在其分子链上引入端羟基有机硅进行共聚改性,所合成的改性聚氨酯/有机硅材料的相容性较好,然后将其制成标准合成革样品进行威士伯耐磨性测试,目的是探索引入低表面能链段方法改进耐磨可行性。实验结果表明:所改性的合成革聚氨酯面层树脂与改性前相比,其100%模量变低,制得的合成革手感更为柔软;合成革的威士伯耐磨性显著提升,明显优于采用聚碳酸酯二醇合成聚氨酯面层树脂。因此,端羟基有机硅可提高聚醚型聚氨酯的耐磨性能,并可增强其柔性。     

合成革用有机硅改性脂肪族聚氨酯树脂的合成及应用

采用聚酯多元醇、异佛尔酮二异氰酸酯(IPDI)、聚醚改性聚硅氧烷(PO-PDMS)等为主要原料合成了有机硅改性脂肪族聚氨酯树脂.考察了不同有机硅含量对聚合物状态、力学性能、耐水性和耐黄变性能的影响,以及有机硅改性脂肪族聚氨酯树脂在合成革上的应用性能.结果表明,相对于物理共混,将PO-PDMS与聚氨酯共聚可有效提高有机硅...     

合成革雾面特黑表面处理剂用脂肪族聚氨酯树脂的研制

以小分子二元醇、异氰酸酯、异佛尔酮二胺(IPDA)和聚酯多元醇为原料合成了一种脂肪族聚氨酯树脂,用作合成革表面处理剂,使合成革表面达到雾面特黑的效果。考察了不同种类二元醇和异氰酸酯所合成的聚氨酯树脂及其粘度对合成革雾面处理剂黑度和雾度的影响。结果表明,小分子二元醇采用1,6-己二醇、异氰酸酯采用异佛尔酮二异氰酸酯(IPDI)和六亚甲基二异氰酸酯(HDI)质量比为1.0∶2.6的混合物时,树脂粘度控制在3000~12000 mPa·s,脂肪族聚氨酯树脂处理合成革表面时雾面特黑效果明显。     

不同软段水性聚氨酯在合成革表面处理中的性能研究

以二羟甲基丙酸(DMPA)为亲水扩链剂,4种同等相对分子质量、具有不同软段结构的二元醇为软段,异佛尔酮二异氰酸酯(IPDI)为硬段,制备了一系列水性聚氨酯。结果表明,聚己二酸新戊二醇酯(PNA)基、聚己内酯(PCL)基[HW1]水性聚氨酯的粒径较小,聚碳酸酯(PCDL)基水性聚氨酯的耐水性最好,聚四亚甲基醚二醇(PTMG)基的耐热性能较为优异,PCL基水性聚氨酯可在100%模量和断裂伸长率取得最佳的平衡。应用性能测试结果显示,PCL基、PCDL基水性聚氨酯所制备的合成革表面处理剂,具有更好的表面颜色牢度、附着性及耐磨性、不粘着性。     

有机硅改性水性聚氨酯在合成革中的应用研究

以聚酯二元醇(PBA2000)、二羟甲基丙酸(DMPA)为亲水扩链剂,1,4-丁二醇(BDO)小分子扩链剂,通过在聚氨酯中加入聚有机硅二元醇(分子量1 000),控制R值不变,改变有机硅二元醇比例合成一系列的聚氨酯乳液,并对有机硅水性聚氨酯及其在合成革中的应用性能进行研究。结果表明,有机硅二元醇的引入使水性聚氨酯乳液粘度由37.27 Pa·s降低到19.35 Pa·s,胶膜吸水率由18.8%减小到12.5%,拉伸强度逐渐降低,作为涂饰剂用于合成革顶层,使合成革干、湿色牢度分别由3.5、4等级提高到5,展色性良好。     

有机硅改性无溶剂聚氨酯树脂在合成革中的应用

通过双组分浇注工艺制备出一系列的无溶剂聚氨酯合成革,探讨了异氰酸酯组分(B组分)-NCO质量分数、异氰酸酯指数(r值)、软段类型及有机硅改性对合成革性能的影响。傅里叶变换红外光谱(FT-IR)谱图表明,有机硅多元醇(OF-OH-702E)与异氰酸酯充分反应接入聚氨酯链段,动态热机械分析(DMA)表明,双组分聚氨酯通过OF-OH-702E改性后玻璃化转变温度(Tg)从-26.4℃下降至-40.35℃。实验数据表明,B组分中的软段聚碳酸酯二元醇(PCDL-2000)与OF-OH-702E质量比为90/10,-NCO质量分数为16wt%时,与聚四氢呋喃二元醇(PTMG-2000)型A组分按照r值为1.05反应产物综合性能最佳,制备出的无溶剂合成革剥离强度达110N/cm3,Taber H-22 1000g耐磨1620转,-20℃8.7万次耐折牢度,70℃95RH%恒温恒湿测试10周剥离强度保留率为85.2%,满足运动鞋用合成革标准。     

中国专利

抗渗早强有机硅防水剂及其制备工艺/CN102040348A/陈磊等有机硅改性水性聚氨酯树脂和用于合成革的水洗处理剂/CN102040719A/淮安凯悦科技开发有限公司陶瓷化硅橡胶电缆料配方/CN102040839A/青岛汉缆股份有限公司单组份室温硫化硅橡胶及制备方法/CN102040840A/苏州     

含氟水性PUA涂饰剂在PU合成革中的应用

采用含氟水性丙烯酸酯改性聚氨酯(PUA)作为合成革表面的涂饰剂,利用干法转移涂层和辊涂处理两种工艺方法分别制备了含氟水性PUA合成革,探讨了涂膜表面的性能.实验表明,含氟水性PUA的涂膜表面具有良好的剥离负荷和撕裂负荷及耐溶剂性;耐磨、耐水解性能与传统溶剂型聚氨酯表面涂饰剂相近.这不仅能环保、洁净生产,而且对合成革用聚氨酯从溶剂型向水性的变革具有现实意义.     

低成本湿法合成革用聚酯型耐水解聚氨酯树脂的合成

以苯酐聚酯二元醇(PS)、聚己内酯多元醇(PCL)、1,4-丁二醇(BDO)、二苯甲烷二异氰酸酯(MDI)等为原料,合成了湿法革用聚氨酯树脂.分别研究了PS相对分子质量、PCL用量、硬段含量等对聚氨酯树脂膜的模量及其耐水解性能的影响.结果表明,PS和PCL复配可以制得耐水解性能优异,且成本较低的湿法合成革用聚氨酯树脂.     

耐水解聚氨酯合成革的开发与性能研究

目前在合成革领域亟待解决的问题是合成革在耐水解老化方面与天然皮革的差距还比较明显。采用自行研制的耐水解聚氨酯树脂,开发出一种组织结构类似真皮,能够提高合成革耐用性的高档聚氨酯合成革。性能分析结果表明：所研究的产品具有耐水解老化性能好,强度高,耐低温,耐磨等优良的物理机械性能,同时手感柔韧,弹性佳,耐用性好,尤其适用于做高档运动鞋、时尚休闲鞋的材料。     

聚氨酯干法转移涂层树脂对合成革吸湿透气性能的影响因素的探讨

对非离子聚氨酯干法面层的吸湿透气行为进行了研究。讨论了非离子共聚组分的引入对聚氨酯合成革吸湿透气行为的影响。结果表明亲水基团PEG的引入可以提高合成革吸湿透气性能。并且微相分离大的吸湿透气性能差。     

木质素筛余物对物料黏度及聚氨酯合成革剥离强度的影响

木质素是聚氨酯合成革中优良的填充剂,其赋予了聚氨酯合成革特殊的物理性能和加工性能,可降低成本。不同的木质素筛余物对木质素/聚氨酯共混体的黏度及聚氨酯合成革的剥离强度有一定的影响,当木质素筛余物质量分数控制在5.5%～6.5%,能得到较佳的作用效果。     

有机硅氧烷改性水性聚氨酯的合成

采用有机硅氧烷单体与聚醚、二羟甲基丙酸（DMPA）和甲苯二异氰酸酯（TDI）反应制备水性聚氨酯涂料。研究结果表明采用后添加有机硅氧烷单体的合成工艺，可制备贮存稳定好的水性聚氨酯乳液；凝胶渗透色谱（GPC）分析表明有机硅氧烷改性水性聚氨酯提高了聚氨酯的相对分子质量；性能测试表明有机硅氧烷改性水性聚氨酯涂料具有明显的优点：涂膜硬度高，耐沾污性、耐水性好和耐溶剂性好。     

有机硅改性聚氨酯弹性体材料的研究

以聚氧化丙烯二醇或聚氧化丙烯三醇、氨乙基氨丙基聚二甲基硅氧烷、甲苯二异氰酸酯为原料在无溶剂条件下制备预聚体,利用二甲基硫甲苯二胺为固化剂合成一系列氨基硅油改性聚氨酯弹性体材料,并对材料的力学性能、耐热性、表面水接触角等性能进行了测试。结果表明,改性后的聚氨酯弹性体具有更优良的力学性能、耐热性及表面疏水性。     

Comfort,chemical, mechanical,and structural properties of natural and synthetic leathers used for apparel

Natural leather is processed from hides and skins of animals. Synthetic leathers are becoming popular as an alternative material owing to limited availability and varying size of natural leathers. There is a need to understand the properties of natural and synthetic leathers to select proper material for an application. In this study, materials used for apparel application such as natural sheep nappa leather and synthetic polyurethane (PU)‐based leather have been chosen and analyzed for comfort, chemical, physical, and structural properties. It was found that natural sheep nappa leather has enhanced water vapor permeability whereas other comfort properties such as softness and drape ability are comparable to synthetic PU leather. Whereas synthetic PU leather dominated most of the physical properties, especially percentage elongation and stitch tear strength, in specific directions on account of polyester knitted base fabric. Chemical properties of natural sheep nappa leather and synthetic PU leather depended on the individual material composition and characteristics. Scanning electron microscopic (SEM) analysis provided convincing evidence for some of the quantified comfort and physical properties. The results of this study would be useful in selection of proper material for apparel application as well as in providing directions for future research in synthetic leather manufacture. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Addition of different amounts of a urethane-based thickener to waterborne polyurethane adhesive

To adjust the rheology of waterborne polyurethane adhesives, different amounts of a hydrophobically modified ethoxylated polyurethane thickener (HEUR) were added. The thickened adhesive solutions were characterized by flow rheology, pH measurements, particle size, solids content and confocal microscopy. The thickened solid adhesive films were characterized by IR spectroscopy, plate-plate rheology, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The adhesion was measured from T-peel test of plasticized PVC/polyurethane adhesive/plasticized PVC and leather/polyurethane adhesive/SBR rubber joints. The addition of the HEUR thickener increased the viscosity of the polyurethane dispersion, and a shear-thinning behaviour was observed due to polyurethane–thickener interactions. The addition of thickener improved the rheological properties of the polyurethane, more noticeable as the content of the thickener increased. The crosslinking of the thickened polyurethane was studied by confocal microscopy. Although the addition of the thickener did not greatly affect the thermal properties of the polyurethane, an improvement in the adhesive strength of leather/adhesive/SBR rubber joints was obtained.     

Synthesis of waterborne polyurethane–silver nanoparticle antibacterial coating for synthetic leather

An antibacterial coating composed of silver nanoparticles and waterborne polyurethane was synthesized for use on synthetic leather. In this study, silver nanoparticles were prepared and used as nanofiller to impart antibacterial property. Silver nanoparticles were synthesized by using poly(vinyl pyrrolidone) as dispersant and sodium borohydride (NaBH₄) as reducing agent. Silver nanoparticles were characterized by transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) analysis. The optimum dispersant was selected according to the zeta potential of dispersions. Waterborne polyurethane was synthesized by using isophorone diisocyanate, 2-bis(hydroxymethyl)propionic acid, triethylamine, and polytetramethylene ether glycol. Waterborne polyurethane–silver antibacterial coating was obtained by ultrasonic dispersion, and then cast on the surface of synthetic leather. The antibacterial property and coating adhesion were investigated. The results showed silver nanoparticles homogeneously dispersed in waterborne polyurethane and adhesion reaching grade 4. Antibacterial testing showed bacterial reduction of 99.99% for Escherichia coli and 87.5% for Staphylococcus aureus.