分散剂和增稠剂对制备透明氧化铁涂料的影响

选择3种不同类型的水性分散剂分散透明氧化铁黄颜料,色浆调入水性丙烯酸清漆中制备透明氧化铁涂料。实验确认了不同类型分散剂对色浆的降黏和分散效果,以及不同类型增稠剂对涂膜光泽和透明度的影响。研究了影响缔合型增稠剂和分散剂相互作用的因素,并进一步探讨了影响疏水改性环氧乙烷聚氨酯类(HEUR)增稠剂和AB嵌段型聚合物分散剂相容性的因素。结果表明:2种主要的缔合型增稠剂和不同类型分散剂的相互作用不同,从而导致涂膜光泽和透明度的不同,嵌段型聚合物分散剂对透明氧化铁黄色浆有较强的降黏和分散稳定作用。这类分散剂和疏水改性碱溶胀丙烯酸乳液增稠剂(HASE)的相容性较好,而和疏水改性环氧乙烷聚氨酯类增稠剂的相容性受到分散剂加量、制漆温度、漆液放置时间的影响。     

光固型支化聚氨酯分散剂的合成

将聚氨酯分散剂设计成超支化结构,通过在聚氨酯末端分别引入颜料锚固基团和双键基团,合成紫外光固化型支化聚氨酯分散剂（BPUs）,使分散剂具有自粘合的效果,以提高印花牢度。通过红外光谱、凝胶色谱、热重分析等分析分散剂的分子结构与性能。通过BPUs为分散剂制备颜料色浆的分散性能良好,粒径分布均匀且具有较低的粘度,并且高温储存5天粒径变化最小在20 nm以内,3000 rpm离心稳定性在92%以上。使用该色浆直接印花,其水洗牢度保持在3~4级, 比商用分散剂提高了2级左右。     

高分子分散剂对UV喷墨色浆分散稳定性的影响

为提高UV喷墨色浆的分散稳定性,对比研究了聚酯型和丙烯酸嵌段型高分子分散剂对UV喷墨色浆的颜料平均粒径、粒径分布、耐热稳定性及离心稳定性的影响。结果表明,当分散剂质量为颜料质量的20%时,UV喷墨色浆的分散稳定性较好。添加聚酯型分散剂和丙烯酸嵌段型分散剂的UV喷墨色浆粒径分别为207 nm和144 nm,颜料粒径分布指数(PDI)分别为0.312和0.200。加热5 d后,含聚酯型分散剂和丙烯酸嵌段型分散剂的UV喷墨色浆颜料平均粒径分别增加为原来的1.89倍和1.04倍。2种UV色浆的离心稳定性均在85%以上。     

紫外光固化型支化聚氨酯分散剂的合成

为使分散剂具有自黏合的效果以提高印花牢度,通过在聚氨酯末端分别引入颜料锚固基团和双键基团,合成了一系列紫外光固化型支化聚氨酯分散剂(BPUs).通过FTIR、GPC、TGA对BPUs的分子结构与性能进行了表征.以BPUs制备的酞菁蓝颜料色浆的分散性能良好,粒径分布均匀且具有较低的表观黏度,颜料色浆在高温(50℃)储存5 d的粒径变化最小的在20 nm以内,在3×103 r/min下离心30 min,颜料色浆的离心稳定性在92％以上.使用该颜料色浆不添加黏合剂直接印花,棉织物水洗牢度保持在3～4级,比商用分散剂提高了2级左右.     

双组分水性聚氨酯色漆耐水性探索

通过2种研磨工艺,采用相同配方体系制备双组分水性聚氨酯色漆,探讨了色浆研磨工艺、分散剂分散效率、水性羟基丙烯酸分散体、水性多异氰酸酯固化剂配比、流平剂、基材润湿剂和增稠剂对涂膜耐水性的影响,得到耐水性优良,可在大巴车、轨道交通、工程机械等领域表面应用的双组分水性聚氨酯色漆。     

水性无树脂色浆体系的研究与制备

相对于含树脂的色浆体系,无树脂色浆体系具有通用性强等特点。文章讨论了水性无树脂色浆制备过程中的影响因素,如颜料、分散剂、消泡剂以及流变剂等,其中在制备有机色浆过程中,超分散剂具有分散性好、稳定性强等特点;确定了无机和有机通用色浆的配方。采用高速分散、研磨等工艺,制备出贮存稳定、相容性良好以及环保的水性色浆,通过SEM观察了色浆的分散状态,测试了其基本性能,如细度、耐化学性等。讨论了色浆的评价方法和色浆在涂料中的应用。     

消息动态

彩色聚氨酯色浆，Bayer推出MDI型粘弹性模塑聚氨酯软泡体系，EVA鞋材采用水性聚氨酯胶粘剂粘接     

水性树脂类色浆的制备及探讨

通过制备5种水性树脂类色浆,研究了分散剂、消泡剂、防沉剂、无机颜料、有机颜料在色浆体系中的影响,并确定了助剂合适添加量。     

聚碳酸亚丙酯基水性聚氨酯的制备及其在水性防腐涂料中的应用研究

采用聚碳酸亚丙酯二元醇(PPC)为软段,制备了PPC型水性聚氨酯乳液(PPC-PUD)。分别采用傅里叶变换红外光谱(FTIR)和动态光散射(DLS)对所合成的PPC-PUD进行表征。以此为分散树脂,配合分散剂研磨色浆,并加入水性聚氨酯乳液和固化剂以及合适的水性助剂,制备了烘烤型水性涂料。对涂料性能进行测试,产品可应用于金属防腐领域。     

无树脂水性色浆贮存稳定性探讨

以氧化铁和酞菁蓝为颜料,考察了不同分散剂、增稠剂种类及用量对水性色浆贮存稳定性的影响,优化了无树脂色浆制备工艺,通过实验验证了提高体系贮存稳定性的条件。适宜的颜料含量、合适的润湿分散剂和增稠剂种类及用量、合理的细度范围,均能在不同程度上影响颜料粒子沉降,改善体系贮存稳定性。     

一种解决聚氨酯涂料体系中颜料沉降分层的新方法研究

制备了一种无毒保洁聚氨酯涂料,选用合适的分散剂,保证了高颜料比例的涂料长期贮存不沉降。这种方法具有推广价值,可为解决聚氨酯类涂料沉降分层问题提供一种新方法。     

氟碳涂料分散性能的研究

以氟碳树脂为基料,制得了具有优异分散稳定性能的氟碳涂料。研究了不同分散剂、湿润剂对氟碳涂料分散性能的影响,通过SEM、IR、分子量分布对氟碳涂料进行了表征。结果表明:当选用3#聚氨酯高分子分散剂和湿润剂A时,氟碳面漆有较好的分散稳定性能,涂膜表面无浮色发花现象,常温贮存12个月后仍具有良好抗浮色发花性能。     

木地板用水性聚氨酯分散体及其涂料

以聚酯多元醇及聚碳酸酯二醇与TDI和IPDI共聚反应制得自交联型水性聚氨酯分散体,讨论了不同原料及不同反应因素对产品性能的影响,并对产品在木地板上的实际应用进行了适应性验证。     

Differential scanning calorimetry analysis of silicon‐containing and phosphorus‐containing segmented polyurethane. II Annealing effect

The effect of thermal annealing on the multiple endothermic behavior and morphological changes in the silicon‐containing and phosphorus‐containing segmented polyurethane (Si‐PU and P‐PU) has been studied by differential scanning calorimetry (DSC). In the amorphous hard segments of the Si‐PU and P‐PU polymers that were annealed below T2, both the T1 temperature, and magnitude of T1 endotherm increased linearly as a function of the logarithmic annealing time (log t_a). This result demonstrated that the endothermic behavior (T1 endotherm) is typical of enthalpy relaxation resulting from the physical aging of the amorphous hard segment. Furthermore, the P‐PU polymer was unstable than the Si‐PU polymer due to the fact that the phosphorus‐containing hard segment produce aged more easily. Dissociation of domains and enthalpy relaxation of hard segments for the Si‐PU polymer was associated with T2 endothermic behavior. However, the enthalpy relaxations of the T2 endothermic behavior for P‐PU polymer was absent, which could be attribute to the behavior of degradation in the temperature range of T2 endotherm. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 3502–3513, 2001     

Study on the poly(3‐hydroxybutyrate‐co−4‐hydroxybutyrate)‐based composites toughened by synthesized polyester polyurethane elastomer

In this study, polycaprolactone(PCL)‐based polyurethane (PU) elastomer containing 45 wt % hard segment component was synthesized and characterized by fourier transform infrared spectroscopy, gel permeation chromatography, and X‐ray diffraction. As a toughening agent, the as‐synthesized PU was incorporated into biodegradable poly(3‐hydroxybutyrate‐co‐4‐hydroxybutyrate) [P(3,4)HB] by solution casting to prepare P(3,4)HB/PU composites. The microstructure and properties of P(3,4)HB/PU composites were investigated using transmission electron microscopy, X‐ray diffraction, tensile testing, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and activated sludge degradation testing. The results show that PU can disperse well in a P(3,4)HB matrix. The elongation at break of P(3,4)HB/PU composites is remarkably increased while the yield strength and elastic modulus are decreased with an increase in PU content. At the same time, it is found that the fracture characteristic of P(3,4)HB is obviously transformed from brittleness into ductility with a gradual increase in PU loading. Moreover, the thermal stability of P(3,4)HB/PU composites is significantly improved compared with that of pure P(3,4)HB. In addition, the biodegradation rate of P(3,4)HB/PU composites is evidently reduced with the increase of PU content in the activated sludge degradation testing. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42740.     

PAPI型聚氨酯改性沥青性能与微观机理

为了研究聚氨酯(PU)对沥青的改性机理,以多亚甲基多苯基多异氰酸酯(PAPI)与聚己二酸乙二醇酯二元醇(PEA)、聚四氢呋喃(PTMEG)合成两种PU预聚体,并用其制备PU改性沥青。采用针入度、软化点、延度、黏度试验测试改性沥青基本性能,并通过傅里叶变换红外光谱(FTIR)、原子力显微镜(AFM)、热重(TG)分析、差示扫描量热法(DSC)对其微观结构及反应机理进行分析。研究结果表明,PAPI型PU可以通过物理和化学反应协同改善沥青的高低温性能,PU的加入可使沥青针入度降幅超过20%,软化点提升高于35%,延度性能提升超350%,两种PU改性剂均可显著提升沥青的黏度。PU与沥青反应生成PU-沥青枝接物提高了相容性,导致改性沥青的官能团比例发生变化,PU掺入后会增大沥青中蜂形结构的高度,从而提高沥青的高温性能。PAPI-PEA型PU改性沥青热稳定性优于PAPI-PTMEG型PU改性沥青,而PAPI-PTMEG型PU改性沥青具有更低的玻璃化转变温度。     

聚酯聚合物多元醇的制备方法

介绍了聚酯聚合物多元醇以及大分子分散剂端羟基预聚体、巯基改性聚酯多元醇和顺丁烯二酸酐(MA)改性聚酯多元醇的制备方法,对合成聚酯聚合物多元醇所需的原料提出了具体要求。聚酯聚合物多元醇用于制备聚氨酯软质泡沫具有一定的价格优势。     

Biocidal polyurethane and its antibacterial properties

The antimicrobial finishes on the cotton fabrics has been known and reported recently. Particularly, the reactive-antimicrobial finishes are the most attractive. In this study, we synthesized three types of polyurethane (PU) polymers; type A (molecular weight of polytetramethylene glycol (PTMG) is 2000), type B (molecular weight of PTMG is 1000), and type C (molecular weight of PTMG is 650). Firstly, the PU prepolymers were prepared by reacting PTMG with 4,4′-diphenylmethane diisocyanate (MDI), then were extended with diethylenetriamine (DETA) (or DETA/hydrazine mixture) to form the PU polymer. The polymer was then grafted with epichlorohydrin and further reacted with different amounts of biocide (QAS) to form biocidal active PU quaternary ammonium salts. The biocidal properties of the PU films were evaluated by the agar plate and the shake flask method. From the experimental results, it demonstrates that these films and finished fabrics exhibit a high biocidal activity against Staphylococcus aureus. The biocidal activity is found to increase with the amount of QAS. After rinsing with water, the biocidal characteristics of these films and finished fabrics remain. From IR spectra, PU films with covalent bond of QAS show an absorption peak at 2300 cm⁻¹, which corresponds to the presence of silicon in QAS. For the mechanical properties, the PU films with QAS sustain the mechanical properties in spite of the increasing amount of grafted QAS.     

有机金属偶联型陶瓷分散剂的研究

文中对新型陶瓷分散剂进行了研究,合成了不同配比的有机配位基甲基丙烯酸的铝锆偶联型分散剂。利用红外光谱对其结构进行表征及分析,通过扫描电镜、黏度测量等方法对分散效果进行了检测,并对分散剂的作用原理进行了理论分析。结果表明当分散剂加入质量分数为1.5%时,降黏幅度达到92.3%,沉降速度明显减慢,分散效果好。加入质量分数超过1.5%后,体系黏度,沉降速度趋于稳定值。此分散剂对硅酸锆具有较好的降黏效果,分散微粒的表面覆盖及包封效果优于其他分散剂,有望作为新型陶瓷分散剂应用于坯料和釉料的制备过程。     

Oxidation resistant ceramic foam from a silicone preceramic polymer/polyurethane blend

Silicon oxycarbide (SiOC) ceramic foams, produced by the pyrolysis of a foamed blend of a methylsilicone preceramic polymer and polyurethane (PU) in a 1/1 wt.% ratio, exhibit excellent physical and mechanical properties. The proposed process allows to easily modify the density and morphology of the foams, making them suitable for several engineering applications. However, it has been shown that, due to residual carbon present in the oxycarbide phase after pyrolysis, the foams are subjected to an oxidation process that reduces their strength after high temperature exposure to air (12 h 1200°C). A modified process, employing the same silicone resin preceramic polymer but a much lower PU content (silicone resin/PU=5.25/1 wt.% ratio), has been developed and is reported in this paper. Microstructural investigations showed that carbon rich regions deriving from the decomposition of the polyurethane template are still present in the SiOC foam, but have a much smaller dimension than those found in foams with a higher PU content. Thermal gravimetric studies performed in air or oxygen showed that the low-PU containing ceramic foams display an excellent oxidation resistance, because the carbon-rich areas are embedded inside the struts or cell walls and are thus protected by the dense silicon oxycarbide matrix surrounding them. SiOC foams obtained with the novel process are capable to maintain their mechanical strength after oxidation treatments at 800 and 1200°C (12 h), while SiOC foams obtained with a higher amount of PU show about a 30% strength decrease after oxidation at 1200°C (12 h).