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采用甲苯二异氰酸酯(TDI)和聚酯多元醇218为原料,二羟甲基丙酸(DMPA)为扩链剂,三乙胺为中和剂制备水性聚氨酯(WPU)。再采用"预乳化溶胀法",利用自制的水性聚氨酯和丙烯酸酯类单体制备互穿网络结构水性聚氨酯-丙烯酸酯复合乳液(WPUA)。将制备的WPU和WPUA复合乳液用于织物整理和涂料印花,探讨了工艺参数对织物整理和印花效果的影响,并对整理后织物的手感、白度、抗皱性、抗起毛起球性、印花织物的耐干/湿摩擦牢度以及耐皂洗牢度等进行测试。结果表明,WPUA的使用能显著改善织物抗皱性和抗起毛起球性以及印花织物的干湿摩擦牢度和耐皂洗牢度。 相似文献
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水性双组分聚氨酯用丙烯酸酯分散体的合成 总被引:1,自引:0,他引:1
采用溶液聚合法合成了水性双组分聚氨酯用丙烯酸酯分散体。系统地研究了溶剂种类、聚合温度、引发剂种类及用量、链转移剂用量对丙烯酸酯多元醇分散体性能的影响,确定了制备低黏度丙烯酸分散体的合成工艺。 相似文献
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《精细与专用化学品》2007,15(9):4-4
热反应型水性聚氨酯羊毛防缩剂具有极佳的防缩效果。整理后的羊毛织物弹性增加,抗皱性提高,并能改善羊毛起球现象。如与一般柔软剂并用,织物手感比未整理前还好。合成工艺路线合理可行,原料立足于国内,防缩效果达到国际羊毛局的机可洗标准,其它性能符合FZ73003-91技术指标。热反应型水性聚氨酯羊毛防缩剂$安徽大学 相似文献
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选择聚酯,聚醚多元醇,异佛尔酮二异氰酸酯(IPDI),二羟甲基丙酸(DMPA)为主要原料,通过正交试验优化了配方,合成了水性聚氨酯抗皱整理剂乳液,并用于织物整理。结果表明:当聚酯多元醇分子量为1000,聚酯/聚醚比例为3:2,R值为2.2,DMPA用量为4.5%时,所得的水性聚氨酯抗皱整理剂性能优异;当整理剂用量为100g/L,JFC用量为1g/L,焙烘温度为160℃,焙烘时间为3min时,棉织物经抗皱整理后折皱回复性最好,同时对棉织物的原有性能影响较小。 相似文献
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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。 相似文献
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自交联型水性聚氨酯涂层剂的研制 总被引:6,自引:0,他引:6
本文探讨了用丙酮法来制备自交联型水性聚氨酯涂层剂的合成和涂布整理工艺。对于合成工艺,采用容量,粘度和IR等三种方法评价了预聚过程;并对OH/NCO摩尔比,潜在交联剂有得、成盐率等因素进行了选择,对于涂布整理工艺,比较了前处理剂,增稠剂,涂布操作粘度,焙烘温度,基布种类等条件和涂层织物耐水压的关系。 相似文献
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主要介绍了单、双组分水性聚氨酯涂料制备用水性树脂的主要类型和基本性能、成膜干燥及固化方式;介绍了水性聚氨酯涂料用主要助剂的类型及选用方法;简述了水性聚氨酯涂料的制备工艺及水性聚氨酯树脂在木器涂料、塑料涂料、汽车涂料等一些硬质基材用工业涂料领域中的应用。 相似文献
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主要介绍了单、双组分水性聚氨酯涂料制备用水性树脂的主要类型和基本性能、成膜干燥及固化方式;介绍了水性聚氨酯涂料用主要助剂的类型及选用方法;简述了水性聚氨酯涂料的制备工艺及水性聚氨酯树脂在木器涂料、塑料涂料、汽车涂料等一些硬质基材用工业涂料领域中的应用。 相似文献
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Dinesh Singh J. K. Gehlawat Musti S. Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1990,47(2):127-136
Oslefins and diolefins are important intermediates in the petrochemical industry and the future promises a further substantial increase in demand. While several catalysts have been formulated in the past for the abstraction of hydrogen from butenes and propylene, these catalysts are inefficient in the abstraction of first hydrogen from butane. Bismuth molybdates (β and γ-phases) containing iron oxide and supported on alumina are used as catalysts in the present investigation on the oxidative dehydrogenation of n-butane. Effects of catalyst content, temperature and oxygen: n-butane ratio on conversion and selectivity to butadiene and (C4H8 + C4H6) are studied in the following ranges of experimental conditions: β-bismuth molybdate/100 mol support I(K), 3–9; γ-bismuth molybdate/100 mol support I(K), 5-20; temperature, 400–500°C; O2: butane ratio, 0.6:1.7. 相似文献
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A viscometer used to measure the viscosity of 10 μl of a liquid, must be miniaturized down, and the liquid velocity gradient in the channel used to determine the viscosity coefficient. Two major factors that affect the liquid velocity are the mechanical forces exerted by the mechanical motors and electromagnetic forces. In this study, electrowetting on dielectric (EWOD) is adopted to drive liquids. Variously sized electrodes on a chip, and two shapes of channel are employed to measure the velocity gradient to determine the viscosity coefficient. The device is fabricated by microelectromechanical system (MEMS) technology. The dielectric layer used in EWOD has a high dielectric constant, BST (Ba0.7Sr0.3TiO3), to reduce the required applied voltage; its surface is coated with hydrophobic polymer, polytetrafluoro-ethylene (PTFE, Teflon® AF DuPont). Experimental results demonstrate that liquids can be pulled at 660 μm/s in linear channels by applying a voltage of 15 V. 相似文献
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考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
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研究了温度和pH值对漆酶酶活以及漆酶处理纤维压制纤维板性能的影响。结果表明,pH较低、温度较高时漆酶酶活较高,压制的纤维板强度性能较好。但温度太高(60~80℃),延长加热时间,漆酶稳定性变差,酶活明显降低,压制纤维板的强度下降。 相似文献
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In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck-Condon species. Despite recent advances in femtochemistry, such a discussion in molecular photochemistry is uncommon, and the problem remains challenging on account of the extremely short-lived excited species. However, in such cases, a small perturbation resulting from, for example, weak guest-host interactions could turn into a determining factor in dictating the course of a photochemical channel of deactivation. Examples of medium-directed diabatic processes have been examined with this idea in mind. A modified view on rhodopsin photoisomerization is presented along with the consideration that confinement does not necessarily lead to inhibition of reactions of the trapped substrate. 相似文献
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采用密度泛函理论(DFT)考察了丙烷在Pt(111)表面上脱氢生成丙烯的反应机理。通过在Pt(111)面上预吸附一定数量H原子模拟共吸附H对丙烷脱氢过程的影响。结果表明:H共吸附能降低丙烷及其脱氢产物的吸附能,促进丙烯脱附,有利于提高丙烯的选择性;H共吸附会导致丙烷脱氢能垒变大,降低催化剂的脱氢活性;共吸附的影响随着H覆盖率增加而增大。 相似文献