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利用聚合物多元醇(POP)和聚醚多元醇同时作为共聚单体制备了聚氨酯自结皮泡沫(ISF),并对其反应机理、配方、工艺以及制品性能进行了研究,制备的聚氨酯自结皮泡沫综合性能优良,可广泛用于汽车方向盘、扶手、头枕、摩托车鞍座、靠背、门把、阻流板以及保险杠等。 相似文献
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以环氧大豆油和2,2-双(羟甲基)丙酸为原料,在无溶剂条件下通过开环法合成了1种高羟值生物基多元醇(ESOD)。以ESOD为羟基组分,六亚甲基二异氰酸酯三聚体为固化剂,单羟基封端聚二甲基硅氧烷(PDMS-OH)为低表面能润滑剂,制备了1种透明光滑的生物基聚氨酯抗涂鸦自清洁涂料。结果表明,只需添加1%(质量分数,下同)PDMS-OH,涂层即具有良好的抗涂鸦和自清洁性能。水、咖啡、白米醋、正十六烷、花生油液滴可在倾斜的涂层表面滑落而不留下痕迹。石墨粉、黏土粉和橙色颜料粉在倾斜的涂层表面能够被水滴轻松带走。油性记号笔在涂层表面划过时,墨水自动收缩成细小的液滴,且可用纸巾轻松擦除而不在涂层表面留下任何痕迹。涂层具有良好的耐磨性,记号笔在涂层表面涂写和擦除1 200次循环后,涂层仍具有优异的墨水收缩能力。 相似文献
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Both HCFC‐ and pentane‐blown rigid polyurethane foams have been prepared from polyols derived from soybean oil. The effect of formulation variables on foam properties was studied by altering the types and amounts of catalyst, surfactant, water, crosslinker, blowing agent, and isocyanate, respectively. While compressive strength of the soy foams is optimal at 2 pph of surfactant B‐8404, it increases with increasing the amount of water, glycerin, and isocyanate. It also increases linearly with foam density. These foams were found to have comparable mechanical and thermoinsulating properties to foams of petrochemical origin. A comparison in the thermal and thermo‐oxidative behaviors of soy‐ and PPO‐based foams revealed that the former is more stable toward both thermal degradation and thermal oxidation. The lack of ether linkages in the soy‐based rather than in PPO‐based polyols is thought to be the origin of improved thermal and thermo‐oxidative stabilities of soy‐based foams. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 467–473, 2000 相似文献
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聚合物多元醇合成与应用 总被引:12,自引:5,他引:7
简要论述了聚合物多元醇(苯乙烯-丙烯腈共聚物接枝聚醚)的发展历史、合成反应原理,介绍了其生产工艺和应用,对基础聚醚、单体、引发剂、链转移剂、分散剂等原料的作用及其选择进行了较为详细的讨论。 相似文献
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Both rigid and flexible water-blown polyurethane foams were made by replacing 0–50% of Voranol® 490 for rigid foams and Voranol® 4701 for flexible foams in the B-side of foam formulation by epoxidized soybean oil. For rigid water-blown polyurethane foams, density, compressive strength, and thermal conductivity were measured. Although there were no significant changes in density, compressive strength decreased and thermal conductivity decreased first and then increased with increasing epoxidized soybean oil. For flexible water-blown polyurethane foams, density, 50% compression force deflection, 50% constant force deflection, and resilience of foams were measured. Density decreased first and then increased, no changes in 50% compression force deflection first and then increased, increasing 50% constant force deflection, and decreasing resilience with increase in epoxidized soybean oil. It appears that up to 20% of Voranol® 490 could be replaced by epoxidized soybean oil in rigid polyurethane foams. When replacing up to 20% of Voranol® 4701 by epoxidized soybean oil in flexible polyurethane foams, density and 50% compression deflection properties were similar or better than control, but resilience and 50% constant deflection compression properties were inferior. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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以丙烯腈(AN)、苯乙烯(sT)、大分子分散剂、小分子有机溶剂和含双键的引发剂为主要原料,使用连续化工艺合成出聚合度较低的预聚体(JMY);再采用连续化工艺,以聚醚多元醇(PPG)为连续相,以AN、ST为聚合单体,进一步合成出冷模塑聚氨酯泡沫用高固含量、低粘度聚合物多元醇(POP),并调整确定了各原料组分的适宜配比和合... 相似文献
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蒋晓群 《化学推进剂与高分子材料》2006,4(4):38-43
采用新型高活性聚合物多元醇GPOP-H45为原料,制备出机械性能良好的高回弹泡沫制品。讨论了影响泡沫性能的主要因素及国外同类产品发泡情况和制品性能的比较。结果发现,在发泡中加入GPOP-H45,可显著提高泡沫制品的承载性及开孔性,同时改进了其机械性能。 相似文献
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介绍了聚合物填充改性多元醇技术的发展概况,并综述了聚合物多元醇、聚氨酯多元醇和聚脲多元醇等填充多元醇的研究进展。 相似文献
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聚合物多元醇是生产聚氨酯原料之一。本文从聚醚多元醇合成工艺入手,重点阐述不燃级聚氨酯泡沫用聚合物多元醇( POP)和高固含量聚合物多元醇( POP)的制造工艺发展,其中不燃级聚氨酯泡沫用POP的制造分为外加法和内加法。最后,对聚醚多元醇工艺进行了总结和展望,国内聚醚生产企业应加快先进合成工艺的开发和引进。 相似文献
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Zoran S Petrović Andrew Guo Ivan Javni Ivana Cvetković Doo Pyo Hong 《Polymer International》2008,57(2):275-281
BACKGROUND: Vegetable oil‐based polyols are a new class of renewable materials. The structure of oil‐based polyols is very different from that of petrochemical polyols, and it is closely related to the structure of oils. The objective of this work was to analyze the structural heterogeneity of soy‐based polyols and its effect on the properties of polyols and polyurethanes. RESULTS: A series of polyols with a range of hydroxyl numbers were prepared by hydroformylation and partial esterification of hydroxyls with formic acid. Polyols were reacted with diphenylmethane diisocyanate to obtain polyurethanes of different crosslinking density. Gelation was simulated using the Monte Carlo method with a calculated distribution of functionalities for each polyol. CONCLUSIONS: Most polyols are powerful crosslinkers since weight average functionality varied from 5 to 2.5 resulting in gel points from 53 to 83% conversion. Heterogeneity of polyols had a negative effect on mechanical properties of rubbery polyurethanes and this should be taken in account when designing polyols for flexible applications. This effect was not pronounced in glassy polyurethanes. Copyright © 2007 Society of Chemical Industry 相似文献
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对聚合物多元醇在聚氨酯微孔弹性体中的应用进行了研究。考察了聚合物聚醚多元醇及聚合物聚酯多元醇对聚氨酯微孔弹性体力学性能的影响。实验结果表明,该类聚合物多元醇的引入可使聚氨酯微孔弹性体制品的力学性能得到较大改善,因此该类聚合物多元醇在聚氨酯领域必将具有广阔的应用前景。 相似文献
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黄玉西;田春蓉;梁书恩;王建华 《中国塑料》2012,26(1):59-64
用大豆油多元醇替代石化聚醚多元醇制备出了硬质聚氨酯泡沫塑料(RPUF),考察了石化聚醚多元醇和大豆油多元醇的比例以及RPUF密度对RPUF性能的影响。结果表明,随着大豆油多元醇用量的增加,RPUF的冲击强度和压缩模量减小,压缩屈服点逐渐消失,玻璃化转变温度升高;但随着大豆油基RPUF密度的增加,其冲击强度、压缩模量和储能模量都得到了提高,压缩模量最高可达56.44 MPa。 相似文献
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Seung Woo Choi Dong Wan Seo Young Don Lim Young Gi Jeong M. S. Islam Mollah Heon Park Tae Whan Hong Whan Gi Kim 《应用聚合物科学杂志》2011,121(2):764-769
The reactive multihydroxy soybean oil (MHSBO) was synthesized from epoxidized soybean oil (ESBO). The ESBO was reacted with ethylene glycol to obtain MHSBO having high functionality. This study investigated a feasibility to prepare wood adhesive through the reaction of polymeric methylene‐diphenyl‐4,4′‐diisocyanate (pMDI) with MHSBO. Different polyurethane adhesives were prepared with a variety of equivalent mole ratios (eq. mole ratios) of MHSBO to pMDI. The chemical reactions of adhesives were analyzed using 1H NMR and Fourier transform infrared (FTIR), and their thermal studies were investigated by DSC and TGA. The MHSBO/pMDI resins (3 : 1 and 2 : 1 eq. mole ratios) showed endothermic peaks, whereas the MHSBO/pMDI resins (1 : 2 and 1 : 3 eq. mole ratios) showed exothermic peaks. The best adhesion strength was found when plywood was bonded with the adhesive of a eq. mole ratio of 2 : 1 (MHSBO : pMDI). These results indicated that the bond strength was not related to the reactivity obtained from the FTIR spectra. But it was explained that the adhesion strength increased as the residual NCO groups in the adhesive reacted with the hydroxy groups of wood during the manufacturing of plywood. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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T. W. Pechar S. Sohn G. L. Wilkes S. Ghosh C. E. Frazier A. Fornof T. E. Long 《应用聚合物科学杂志》2006,101(3):1432-1443
Polyurethane Networks (PUNs) were synthesized using polyols derived from soybean oil, petroleum, or a blend of the two in conjunction with diisocyanate. The soybean‐based polyols (SBPs) were prepared using air oxidation, or by hydroxylating epoxidized soybean oil. Some of the networks were subjected to several solvents to determine their respective swelling behavior and solubility parameters. Sol‐fractions were also determined, and DMA experiments were utilized to monitor the changes in storage modulus and tan δ with temperature for networks with sol and with the sol extracted. A linear relationship was noted between the hydroxyl number of a SBP and the glass transition temperature of its corresponding unextracted PU network within the range of hydroxyl numbers (i.e., 55–237 mg KOH/g) and glass transition temperatures (i.e., ?21–+83°C) encountered in this work. This same linear relationship was realized between the weighted hydroxyl number of soy and petroleum‐based polyol blends and the glass transition temperature of the resulting unextracted and extracted network PUs within the ranges utilized in this study (i.e., 44–57 mg KOH/g, ?54–19°C). © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1432–1443, 2006 相似文献
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The soy polyols were prepared from epoxidation of soybean oil followed by ring opening of oxirane obtained by using methanol as the ring opener. Polyols of hydroxyl (OH) numbers ranging from 128 to 174 mg of KOH/g were obtained by the variation of epoxidation time of soybean oil. A novel cast polyurethane resin has been synthesized by these polyols and 2,4‐toluene diisocyanate. Swelling of networks in toluene showed that the sol fraction varies from 1.13 to 72.06%. The thermal and mechanical properties of cast resins were characterized by differential scanning calorimetry and thermogravimetric analysis. The results showed that the glass transition temperature increases with the increase of OH number and that the thermal stability of the resins was slightly decreased with the increasing OH number. The tensile strength at break increases with the increase of OH number. Polyols with OH number of 174 mg of KOH/g gave glassy polymers, whereas those below this value gave rubbers. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献