聚环氧氯丙烷——蓖麻油聚氨酯密封胶的研究

由端羟基聚环氧氯丙烷－蓖麻油与多异氰酸酯制备聚氨氨酯密封胶,主要研究了扩链剂对该密封胶的力学性能、粘接性能的影响,并研究了一些其它性能。     

建筑用聚氨酯密封胶

聚氨酯密封胶性能优良，可用于建筑业的各个领域。本文对聚氨酸密封胶的主要品种作了介绍。     

聚氨酯密封胶及其进展

对聚氨酯密封胶的性能、组成、原料、制备方法、应用和发展状况进行了总结，并简要综述了该领域的技术进展。     

蓖麻油基聚氨酯胶粘剂研究

论述了以蓖麻油(BA)为基体材料,PAPI为固化剂的新型聚氨酯胶粘剂的研制。样品经过高低温介质等试验,结果表明,此类胶粘剂能够耐高低温,因油类介质的作用,粘接强度高,是一种极有前途的耐温耐油胶粘剂。     

蓖麻油型单组分聚氨酯发泡胶的制备

研究了以蓖麻油、聚醚多元醇、聚酯多元醇、PAPI为原料合成系列发泡单组分聚氯酯胶粘剂的工艺,研究了各因素对预聚体的合成、产品性能及贮存稳定性的影响。结果表明,异氰酸酯指数为28～30,蓖麻油为多元醇总质量的40％,预聚催化剂为T-12,固化催化剂为吗啉类和LX-1,溶剂为乙酸乙酯和二氧甲烷,在70-80℃下反应3h,得到符合建材工业要求的产品。     

单组份聚氨酯弹性密封胶的研究

本文是单组份湿固化聚醚型聚酯密封胶的合成与研究。该胶由二官能度和三官能度聚醚与ＴＤＩ反应制成预聚体后再加入多种填料和催化剂制成。讨论了ＴＤＩ用量,反应温度,聚醚的组成及填料对该胶的影响。     

蓖麻油型聚氨酯胶粘剂粘合性能的研究

探讨了预聚体合成时二元醇质量分数及胶粘剂配制时—ＮＣＯ／—ＯＨ摩尔比和催化剂（有机锡类）质量分数对蓖麻油型聚氨酯胶粘剂粘合性能的影响。结果表明,预聚体合成时二元醇质量分数为０７０及胶粘剂配制时—ＮＣＯ／—ＯＨ摩尔比为１３时,催化剂质量分数为０００６～０００８和—ＮＣＯ／—ＯＨ摩尔比为１４时,催化剂质量分数为０００４～０００６,胶粘剂的粘合性能最佳;胶粘剂配制时—ＮＣＯ／—ＯＨ摩尔比增大,胶粘剂的粘合性能提高;蓖麻油型聚氨酯胶粘剂的耐水性较好     

不干性聚氨酯密封胶的研究

本文介绍了无溶剂，不干性，触变性聚氨酯密封胶的制备工艺，技术指标，对影响密封胶性能的一些因素进行了讨论，该密封胶可用于机床，机动车辆，暖气，煤气，水管管道安装和密封，有效防止油，气泄漏。     

蓖麻油改性环氧聚氨酯防腐蚀涂料的研制

介绍了一种蓖麻油改性的环氧聚氨酯防腐蚀涂料.以蓖麻油改性异氰酸酯预聚物和环氧树脂为基料,以价格较为低廉的滑石粉、钛白粉、沉淀硫酸钡为颜填料制备了成本较低,性能较为优异的防腐蚀涂料.检测了优化条件下制备的涂料的性能.以蓖麻油改性环氧聚氨酯防腐蚀涂料和未经蓖麻油改性的环氧聚氨酯防腐蚀涂料进行防腐蚀性能对比,蓖麻油改性环氧聚氨酯防腐蚀涂料的耐酸、碱、盐水等防腐蚀性能更好.     

蓖麻油基聚氨酯灌封胶的固化行为研究（Ⅰ）固化过程中的流变行为和凝胶时间

以蓖麻油,4,4’-二苯基甲烷二异氰酸酯(MDI)、三羟甲基丙烷(TMP)与1,2-丙二醇为原料合成了蓖麻油基聚氨酯灌封胶,研究了灌封胶的固化流变行为和凝胶化时间。结果表明,该灌封胶初始粘度低,在20℃时不超过1600mPa     

Modified Castor Oil Based Polyurethane Elastomers for One-Shot Process

Studies have been carried out on polyurethane elastomers based on modified castor oil in combination with different molecular weights of polyethylene glycol and polymeric methylene diphenyl-4,4′-diisocyanate (PMDI). The resulting polymers were cast into molds and the moldings were characterized by scanning electron microscopy and thermogravimetric analysis. Mechanical properties such as tensile strength, elongation at break, hardness, abrasion resistance, and compression set were measured. There is an increase in the flexibility of polyurethanes with increase in molecular weight of PEGs added to modified castor oil.     

蓖麻油基聚氨酯-聚丙烯酸酯复合乳液的制备与性能研究

采用种子乳液聚合方法合成了蓖麻油基水性聚氨酯-聚丙烯酸酯复合乳液,通过激光散射法、透射电镜(TEM)、傅里叶红外光谱(FTIR)对该复合材料进行了表征。结果表明,该乳液具有核壳结构,并且随着原料中蓖麻油与聚己二酸丁二醇酯二醇(PBA)摩尔比的增加,复合材料的耐水性逐渐提高;聚丙烯酸酯的引入对乳液的粒径和胶膜性能均有影响,合适的PA/PU摩尔比在2∶3~1∶1之间;当COOH基质量分数为1.2%时,加入2%的十二烷基硫酸钠(SDS),乳液外观由乳白色变为透明色,且凝胶量少,乳液的稳定性好。     

蓖麻油聚氨酯互穿网络型聚合物性能的研究

分别用甲苯二异氰酸酯(TDI)和六亚甲基二异氰酸酯(HDI)与蓖麻油(CO)反应制备出两种聚氨酯预聚体,再用预聚体与苯乙烯、丙烯腈、甲基丙烯酸甲酯、环氧树脂(E-44或E-51)等单体制备出蓖麻油聚氨酯互穿网络型聚合物(CO-PU IPN),研究了体系组成对该聚合物拉伸强度的影响。结果表明,随着固化时间的延长,CO-PU IPN的拉伸强度逐渐增大,TDI型CO-PU IPN比HDI型的拉伸强度大;烯类单体比环氧树脂单体所制CO-PU IPN的拉伸强度大,不同烯类单体之间的差别不大;增加预聚体中NCO/OH的摩尔比,CO-PU IPN的拉伸强度都是先增加,后减小,在摩尔比为2.25时出现最大值;添加抗氧剂1010、紫外光吸收剂UV-327和光稳定剂292等对CO-PUIPN的拉伸强度基本没有影响。     

聚氨酯乳液胶粘剂的研制

报导了以蓖麻油和甲苯二异氰酸酯为主要原料,以酒石酸为亲水单体合成的聚氨酯乳液胶粘剂的配方组成、制备工艺和性能的研究,讨论了影响乳液胶粘剂的合成工艺及性能的主要因素。     

聚四氢呋喃醚二醇/蓖麻油基聚氨酯脲弹性体的制备与性能

以可再生的蓖麻油、聚四氢呋喃醚二醇(PTMG-1000)、甲苯二异氰酸酯(TDI)为原料,采用预聚体法合成了一系列的聚氨酯脲弹性体(PUU)。使用电子拉力机测定了材料的力学性能,并采用示差扫描量热仪(DSC)和热重分析仪(TG)对材料进行了热分析。结果表明,随着PTMG-1000质量分数的增加,材料的拉伸和撕裂强度先增加后降低,断裂伸长率不断增加,硬度有所下降。PTMG-1000/蓖麻油软段共混型PUU的耐热性能明显优于单纯蓖麻油基PUU。     

Bio-Based Polyurethanes from Microbially Converted Castor Oil

Bio-based new polyurethanes (PU) were synthesized from microbially converted castor oil. Castor oil was used as a raw material to synthesize 7,10,12-trihydroxy-8(E)-octadecenoic acid (TOD) by the strain Pseudomonas aeruginosa PR3. Subsequently, hexamethylene diisocyanate (HMDI) was used in different ratios and reacted with TOD to produce new PU. Fourier transform-infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gas chromatography/mass spectrometry were used to confirm the identity of TOD. Differential scanning calorimetry, thermogravimetric analysis, and tensile property testing were used to investigate the thermal and mechanical properties of PU. PU synthesized based on TOD had a tensile strength of 45.4 MPa with low elongation at break of 8.16% at an isocyanate/hydroxyl ratio of 2.0. To modify the properties of PU, TOD was blended separately with polyethylene glycol or polycaprolactone diol at different weight ratios before reacting with HMDI. The modified polymer showed improved thermal stability and comparatively higher elongation at break. This is the first study demonstrating the conversion of castor oil into TOD that can be used stand alone or as a blend for PU synthesis.     

Castor oil dehydration kinetics

The dehydration reaction kinetics of castor oil was investigated with sodium bisulfate-sodium bisulfite mixture (SB-SB) or p-toluenesulfonic acid as catalyst. Reactions were carried out at 210, 220, and 230°C, and a kinetic model was determined for each case. The reactions with SB-SB catalyst at 210 and 220°C and with p-toluenesulfonic acid at 210°C followed second-order kinetics. A first-order rate equation showed the best fit to the experimental data for the reaction with SB-SB at 230°C. p-Toluenesulfonic acid-catalyzed reactions at 220 and 230°C were also first-order reactions. Additionally, some mathematical equations were derived between iodine value, refractive index, viscosity, and reaction time.     

异氰酸酯类型对蓖麻油基聚氨酯性能的影响

以4,4-二环己基甲烷二异氰酸酯(HMDI)、异氟尔酮二异氰酸酯(IPDI)、蓖麻油基多元醇为主要原料,在不添加扩链剂及交联剂的情况下,采用两步法(预聚体法)制备了蓖麻油基聚氨酯材料。通过动态力学性能(DMA)、热失重(TGA)及力学性能测试等手段对聚氨酯材料的性能进行测试,探究异氰酸酯类型及溶剂对蓖麻油基聚氨酯材料性能的影响。结果表明:HMDI型聚氨酯材料的拉伸强度与耐热性能均优于IPDI型聚氨酯材料,但IPDI型聚氨酯材料的断裂伸长率相对较高;采用丙酮作为溶剂会在降低材料拉伸强度与耐热性能的同时提高材料的断裂伸长率;蓖麻油基聚氨酯材料具有较高的损耗因子(tanδ),因此其具有优异的阻尼性能,有效阻尼温域集中于常温区域。