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安徽大学研究者选择聚醚多元醇、端羟基聚丁二烯、甲苯二异氰酸酯、γ-氨丙基三乙氧基硅烷等为主要原料,在制出聚氨酯预聚物之后,又添加助剂与填料,最终制得单组分湿固化聚氨酯密封胶。由于采用聚丁二烯改性和端硅烷化两项工艺革新,促使该胶的表干时间延长,粘接性能提高,拉伸强度有所增进,断裂伸长率降低。该胶拓展了聚氨酯胶粘剂的实用领域,市场前景较佳。 相似文献
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深圳固福化学公司的技术人员选用聚醚多元醇和TDI为主要原料,先合成出预聚体后,再用N-苯基-γ-氨丙基三甲氧基硅烷进行封端及改性,最终加入填料,研制成单组分聚氨酯密封胶。其粘接强度高,如拉伸强度为2.8MPa,断裂伸长率为376%,室温可快速表干,硫化速率高,此外,该胶粘度适宜,施胶后不下垂。该胶对多种基材如钢铁、玻璃、铝和大理石等皆有良好的粘接效能,故在机械工业、铝制品、建筑工程及装饰、电子等行业实用性强,市场前景乐观。 相似文献
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《有机硅材料及应用》2014,(5):373-373
广东新展化工新材料有限公司的方铭中等人以硅烷封端聚氨酯预聚物、邻苯二甲酸二异壬酯、纳米碳酸钙、聚酰胺SL、气相法白炭黑R812S、二月桂酸二丁基锡、乙烯基三甲氧基硅烷、N-β-氨乙基-γ-氨丙基三甲氧基硅烷、γ-氨丙基三甲氧基硅烷为原料,制成了门窗用硅烷封端聚氨酯密封胶(SPU)。研究了补强剂纳米碳酸钙的种类、用量以及触变剂的种类对SPU密封胶性能的影响。 相似文献
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以4,4′-二苯基甲烷二异氰酸酯(MDI)、聚醚多元醇(N-210)和聚己二酸己二醇酯(PHA)为主要原料,控制R=n(-NCO)/n(-OH)=2.0,制得PUR(湿固化聚氨酯热熔胶)的预聚体;然后以不同的硅烷偶联剂[如Y9669(N-苯基-γ-氨丙基三甲氧基硅烷)、KH-550和KH-560等]作为PUR中部分端-NCO基的封端剂,制备SPUR(硅烷化PUR)。结果表明:Y9669是较理想的封端剂,能使SPUR的剪切强度增加37.23%;SPUR的硬度、热稳定性能随Y9669封端率增加而增大;SPUR的剪切强度随Y9669封端率增加呈先升后降态势,并且在Y9669封端率为20%时相对最大(17.73 MPa)。 相似文献
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以异佛尔酮二异氰酸酯(IPDI)和聚酯多元醇218为预聚原料、2,2-二羟甲基丙酸(DMPA)为亲水性扩链剂、三羟甲基丙烷(TMP)为交联剂、三乙胺(TEA)为中和剂、γ-氨丙基三乙氧基硅烷(KH 550)为改性剂,制得有机硅改性水性聚氨酯(WPU-Si);并将其用作纯棉及涤/棉机织物的涂料印花耐摩擦色牢度提升剂。研究了KH 550用量对乳胶粒粒径及胶膜吸水率、拉伸强度和拉断伸长率的影响;通过FT-IR分析对其结构进行了表征,利用SEM对整理后织物的表面形态进行了表征。结果表明,KH 550较佳的质量分数为3%。将WPU-Si应用在机织物的涂料印花中,对于纯棉织物,当WPU-Si质量分数为6%时耐干、湿摩擦色牢度最佳;对于涤/棉织物,当WPU-Si质量分数为5%时耐干、湿摩擦色牢度最佳;通过SEM照片表明纤维空隙之间及织物表面明显均有胶膜的存在,纤维与纤维之间存在明显的粘连,说明整理剂成功附着于纤维和织物的表面,达到了整理的目的。 相似文献
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有机硅/丙烯酸酯改性水性聚氨酯的合成及性能 总被引:2,自引:1,他引:1
以异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)、聚酯二元醇(XH-111)、丙烯酸羟乙酯(HEA)和3-氨丙基三乙氧基硅烷(KH-550)等为主要原料,分别制得HEA封端和HEA、KH-550共同封端的水性聚氨酯乳液,再加入丙烯酸酯单体进行自由基引发聚合,分别制备出丙烯酸酯改性和丙烯酸酯、KH-550共同改性的水性聚氨酯复合乳液。通过傅立叶变换红外光谱(FTIR)、热失重分析(TGA)、X射线衍射分析(XRD)和力学性能测试,对改性水性聚氨酯乳液的结构和胶膜的热稳定性、结晶性和力学性能进行了考察。结果表明,改性水性聚氨酯的结晶性降低,热稳定性提高。当w(丙烯酸酯)增大到20%,w(KH-550)增大到15%时,胶膜的拉伸强度由5.6 MPa增加到23.9 MPa,断裂伸长率由491%降到247%。 相似文献
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蓖麻油基聚酯多元醇的制备及表征 总被引:1,自引:0,他引:1
以可再生资源蓖麻油、苯酐和小分子醇为原料,钛酸正丁酯为催化剂,经酯化、缩聚合成蓖麻油基聚酯多元醇,考察了反应时间对聚酯多元醇酸值的影响以及不同官能度的小分子醇对醇解蓖麻油结构和羟值的影响。采用红外光谱仪(FT—IR)、凝胶色谱(GPC)、热失重仪(TGA)对醇解蓖麻油、蓖麻油基聚酯多元醇的相对分子质量、热稳定性进行了表征。结果表明,随着小分子醇官能度的增加,醇解体系中单酯和二酯含量明显减少,转化率也相应减小;甘油醇解蓖麻油和蓖麻油基聚酯多元醇较普通聚醚多元醇635具有更高的热稳定性。 相似文献
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Chengshuang Wang Jie Zhang Jieru Huang Han Wang Meng He Liang Ding 《European Journal of Lipid Science and Technology》2021,123(4):2000248
Although tremendous efforts have been dedicated to developing environmentally friendly bio-based waterborne polyurethane (WPU) dispersions from vegetable oil, the fabrication of WPU dispersions solely derived from vegetable oil-based polyol with excellent comprehensive properties is still challenging. In the present work, novel bio-based WPU dispersions derived from castor oil and soy polyol is successfully modified by phosphorus-nitrogen chain extender [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester (BH). The structure and properties of the dispersions and films are characterized systematically by Fourier transform infrared spectroscopy, thermogravimetric analysis , mechanical test, and limiting oxygen index (LOI), etc. The results indicate that bio-based WPU films display moderate mechanical performance by adjusting BH content, and the WPU film containing 100% BH with 47.8% biobased content has a tensile strength of 8 MPa and the highest Young's modulus of 62.3 MPa. The incorporation of BH can increase the production of char residue. The flame retardancy of WPU films increase gradually with the BH molar content, and the LOI value of the WPU100 with 1.53 wt% phosphorus content can reach as high as 28.1%. This work may provide a new approach to develop high biobased content, eco-friendly, flame retardant WPU for application in the surface coating industry. 相似文献
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以绿色可再生的蓖麻油(CO)和甘油为原料进行酯交换,然后将其产物(P-CO)与六氢苯酐(HHPA)进行酯化反应制备了蓖麻油基多元醇(P-HHPA-CO),将P-HHPA-CO和甘油代替传统的石油类多元醇,与异氟尔酮二异氰酸酯(IPDI)在无催化剂条件下合成了环保型脂肪族聚氨酯胶黏剂,并对不同NCO/OH摩尔比制备的聚氨酯胶黏剂涂膜进行了热重分析、差示扫描量热分析、拉伸力学性能测试、剥离及剪切强度测试。结果表明,制得的P-HHPACO羟值为219mg KOH/g;当摩尔比为1.3时,聚氨酯胶黏剂涂膜的T剥离强度达到399.2N/m;摩尔比为1.5时,剪切强度达到7.1N/mm2。 相似文献
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用蓖麻油(CO)、六亚甲基二异氰酸酯(HDI)和单体交联剂苯乙烯(St)、丙烯腈(AN)、甲基丙烯酸甲酯(MMA)为主要原料,制得了HDI/St、HDI/AN和HDI/MMA等3种蓖麻油/聚氨酯互穿网络型聚合物(CO-PU IPN);研究了CO-PU IPN组成对拉伸性能的影响,并利用红外光谱分析对IPN的潮气固化过程进行了分析。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,6d后基本达到最大值;HDI/St、HDI/AN和HDI/MMA型CO-PU IPN的拉伸强度差别不大;增加预聚体中NCO/OH的摩尔比nNCO/nOH,CO-PU IPN的拉伸强度都是先增加,后减小,在nNCO/nOH为3·25时出现最大值。 相似文献
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利用端氨基偶联剂KH-550对纳米SiO2进行表面改性,在超声场作用下制备疏水性纳米SiO2粒子,并将其均匀分散到蓖麻油(CO)-聚氨酯溶液,通过红外光谱(IR)、热重分析(TGA)和扫描电镜(SEM)等测试方法,探讨醇溶性聚氨酯的热稳定性、铅笔硬度和胶膜力学性能等。红外分析表明,PU大分子和纳米SiO2之间形成化学键,形成了Si—O—Si结构。当蓖麻油添加量为多元醇总质量的10%时,拉伸强度由原来的6.8 MPa增加到16.2 MPa,吸水率降低至原来的1/2。纳米SiO2颗粒掺杂量由0%增加到2%时,PU涂膜的失重速率最高点温度由原来的345℃提高至369℃,热分解温度也有所提高。涂膜热重曲线出现右移。 相似文献
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Yuehong Zhang Zhenqiang Wu Lei Shi Langlang Dai Ruijing Liu Lei Zhang Bin Lyu Shunhua Zhao Vijay Kumar Thakur 《大分子材料与工程》2023,308(6):2200662
A novel castor oil-based multifunctional polyol (CM) is fabricated through mild thiol-ene photo induced reactions using castor oil (CO) and 1-thioglycerol (MPD) as building blocks. The effect of the reaction time, molar ratio of thiol to carbon–carbon double bond, and the loadings of photo-initiator are optimized. The resulting CM is combined with CO and employed as cross-linkers to prepare castor oil-based water-borne polyurethane emulsion with desirable mechanical properties and water resistance. Owing to the incorporation of CM cross-linker with high hydroxyl value of 371 mg KOH/g (which is 2.27 times higher than that of the CO), the prepared castor oil-based waterborne polyurethane (CMWPU) possesses compacted 3D network structure with high cross-linking degree, leading to improved glass transition temperature (45 °C), tensile strength (10.8 MPa), water contact angle (87.4°), and decreased water absorption rate (16.12%) with 20% CM additions. Overall, this work illustrates the feasibility of introducing bio renewable CM combined with CO to develop castor oil-based WPU employing a sustainable development strategy. 相似文献
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In this research, castor oil-based polyols with gradual increasing functionalities were prepared using thiol-ene photo click reaction. The polyols were prepared by facile and efficient photo-click reaction using thiols with different number of hydroxyl groups. The polyols were successfully synthesized using a modified bio-oxygen demand (BOD) reactor and their structures were characterized. The hydroxyl number of the prepared polyols gradually increased depending on the thiol used for preparation. The increased hydroxyl number resulted in increased crosslinking densities for the prepared polyurethanes. The effect of the increasing crosslinking density and structure of the polyols on the mechanical and thermal properties of polyurethane were investigated. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48304. 相似文献