纳米锌/硫化钠/环氧丙烯酸酯涂层的阻燃性能研究

为探讨纳米锌与硫化钠对环氧丙烯酸酯(EA)涂层的阻燃效果,以乙酸锌和苜蓿粉为原料,利用植物还原法制备了纳米锌,将其与硫化钠及EA配合,经紫外光固化制备纳米锌/硫化钠/EA阻燃涂层。通过红外、紫外、差示扫描量热仪及力学分析仪对其阻燃、透光率、热稳定性及硬度等性能进行测定。结果表明:当纳米锌质量分数为10%时,纳米锌/硫化钠/EA涂层阻燃性能最佳,涂层残余率达19.47 %,极限氧指数达31。所有涂层硬度均为6H,涂层热稳定性随纳米锌质量分数的增加而增加,而透光率逐渐下降。     

Zn2SnO4的制备及其对软质聚氯乙烯的阻燃研究

以结晶四氯化锡和硝酸锌为原料,通过2步煅烧法制备锡酸锌(Zn2SnO4)阻燃剂;通过极限氧指数、烟密度等级和残炭量研究了Zn2SnO4对软质聚氯乙烯（PVC）的阻燃和消烟性能的影响,同时对力学性能进行了研究。结果表明,Zn2SnO4的用量为15份时,对软质PVC的阻燃消烟效果明显,其极限氧指数可达36.0 %、烟密度等级为86.2 %、残炭率为29.7 %、拉伸强度为25.47 MPa、断裂伸长率为168 %;利用热重分析、差热分析和扫描电子显微镜等方法对阻燃PVC进一步进行表征,结果表明Zn2SnO4的加入促使软质PVC的起始分解温度降低,残炭量增加,燃烧后剩炭结构致密,阻燃效果明显。     

触变剂活性SiO2的阻燃性能研究

本文对通常用做触变剂活性SiO_2的阻燃性进行讨论。     

UV固化环氧丙烯酸酯-纳米Al2O3颗粒复合涂层的性能

制备了UV固化环氧丙烯酸酯-纳米Al2O3复合涂料. 对纳米复合涂层的硬度、附着力、耐腐蚀性及热稳定性等性能进行了表征,并考察了纳米Al2O3对涂层性能的影响规律. 结果表明,涂层硬度及附着力先随纳米Al2O3添加量增加而提高,添加量为2%时,涂层附着力达1级;添加量为3%时,涂层铅笔硬度达6H;添加量继续增大,涂层硬度及附着力均下降. 对纳米复合涂层的热重分析和电化学阻抗谱分析结果表明,加入纳米Al2O3能提高涂层的热稳定性,但加入未改性纳米Al2O3使涂层的耐腐蚀性下降.     

PP/纳米SiO2复合材料的阻燃性能研究

将磷系阻燃剂1,3,5-三（5,5-二甲基-1,3-二氧杂环己内磷酸基）苯（FR）、聚磷酸铵（APP）、纳米SiO2复配,制备聚丙烯(PP)纳米复合阻燃材料。采用氧指数测定仪、水平垂直燃烧测定仪、热重分析仪、锥形量热仪对PP纳米复合阻燃材料的阻燃性能进行了研究。结果表明,FR/APP/SiO2提高了PP的氧指数、水平燃烧等级、热稳定性和残炭率,降低了热释放速率。当阻燃剂FR/APP/SiO2的总体含量为25 %,FR/APP/SiO2配比为15/7/3的情况下,PP纳米复合阻燃材料的氧指数为29.4 %,水平燃烧等级为FH-1。     

紫外光固化环氧丙烯酸酯涂料

合成了涂料用紫外光固化环氧丙烯酸酯树脂,并对其固化时间、铅笔硬度、附着力、柔韧性、耐磨性及耐化学品性进行测试,获得了预期的效果。     

紫外光固化纳米凹凸棒石/环氧丙烯酸酯复合涂层的制备与表征

为了提高凹凸棒石(ATP)在环氧丙烯酸酯(EA)涂层中的分散性能,用4,4-二苯基甲烷二异氰酸酯(MDI)对ATP表面进行有机改性,制备了MDI接枝ATP(MDI-g-ATP)复合材料。对MDI-g-ATP复合材料的红外光谱和热分析结果证实,MDI接枝到了凹凸棒石表面。然后采用共混法制备了紫外光固化纳米MDI-g-ATP/EA复合涂层。研究了MDI-g-ATP的添加量对MDI-g-ATP/EA)涂层耐冲击力、柔韧性以及凝胶率的影响。结果表明:当MDI-g-ATP的用量为5%时,与EA涂层相比,MDI-g-ATP/EA涂层的耐冲击力的最大高度由20·cm增加至35·cm;涂膜的柔韧性由15 mm减小至5 mm;此外,与未改性的ATP相比,MDI-g-ATP在EA涂层中具有良好的分散性。     

模板合成 AC-Zn2SnO4对 PVC热降解性能影响

通过活性炭模板法制备锡酸锌阻燃剂(AC-ZnzSnO4),并用X射线衍射仪(XRD)对其表征.将其应用于聚氯乙烯(PVC),采用极限氧指数(LOI)、烟密度研究了阻燃剂对PVC阻燃性能和力学性能的影响;通过热重-红外-质谱分析(TG-MS-IR)和扫描电子显微镜(SEM)研究了阻燃前后PVC热降解性和炭层形貌,探究其阻...     

聚氨酯丙烯酸酯/环氧丙烯酸酯分散体系的制备

用水性聚氨酯丙烯酸酯改性环氧丙烯酸酯,制备了聚氨酯丙烯酸酯/环氧丙烯酸酯分散体系。随着分散体中聚氨酯丙烯酸酯浓度的增加,体系稳定性增加,当其浓度达到30%时,可制得稳定的分散体系。这种分散体系可作为一种紫外光固化水性涂料,其涂膜的耐磨性、柔韧性都比环氧丙烯酸酯涂膜增强,而硬度变化不大。     

丙烯酸酯聚氨酯/SiO2纳米复合涂层结构与形态对其耐刮伤性影响研究

以四乙氧基硅烷(TEOS)作为主要前驱体,通过改变溶胶-凝胶工艺参数制得了结构和形态各异的丙烯酸酯聚氨酯/SiO2纳米复合涂层,利用TEM、SAXS等手段表征涂层的结构与形态,由洗刷前后涂层的失光率来表征耐刮伤性,详细探讨了纳米复合涂层耐刮伤性与SiO2相特征、有机无机相作用力及SiO2质量分数之间的关系。研究表明:丙烯酸酯聚氨酯涂层中引入纳米SiO2相后,耐刮伤性明显提高。有机相与SiO2相之间的作用力是影响涂层耐刮伤性的最重要因素,作用力越强,耐刮伤性越好。网络状纳米SiO2与颗粒状纳米SiO2相比,更有利于耐刮伤性的提高,且网络状纳米SiO2质量分数越大,耐刮伤性越佳,但SiO2相的致密度和尺寸对耐刮伤性影响较小。对于颗粒状胶体SiO2,在15~160 nm范围内,粒径对耐刮伤性没有明显影响;随着胶体SiO2粒子的质量分数增加,耐刮伤性先增大后减小。     

Flame retardancy and thermal property of novel UV-curable epoxy acrylate coatings modified by melamine-based hyperbranched polyphosphonate acrylate

A novel melamine-based hyperbranched polyphosphonate acrylate (MHPA), successfully synthesized via the Michael addition polymerization of 2-(2-amino-ethylamino)-4,6-bisethylamino-1,3,5-triazine with tri(acryloyloxyethyl) phosphate, was blended with the epoxy acrylate (EA) to prepare UV-cured flame retardant coatings. The study of their flammability revealed that MHPA can improve the flame retardancy and the sample with 45 wt% MHPA (EA3) showed a good intumescent behavior when combusted. The results of their thermal degradation displayed that MHPA had a dual effect on the thermal stability of EA: leading to its earlier degradation catalyzed by acidic species from the relatively weak phosphorus-bearing parts, but improving the thermal stability of the char layer at high temperature due to the formed intumescent phosphorus–carbon compounds. Besides, the total release amount of gas products of EA3 was much lower than that of pure EA and various flammable gases like hydrocarbons and highly toxic CO were also reduced     

紫外光固化环氧丙烯酸酯涂料的制备及耐蚀性能研究

以E-51环氧树脂和丙烯酸为原料合成出光敏性环氧丙烯酸酯低聚物,制备了不同组成的紫外光固化涂料.合成产物的红外光谱分析结果表明,光敏性碳碳双键基团被引入到环氧树脂结构中;固化后涂层的红外表征结果表明,碳碳双键C=C的特征吸收峰消失,涂层固化较完全.在无水乙醇、5%NaOH和5%H2SO4溶液中的浸泡实验以及在3.5%NaCl溶液中的电化学阻抗谱测量结果表明,涂层具有较好的耐蚀性,其耐蚀性随着涂料中环氧丙烯酸酯含量的增加,呈先提高后下降的趋势.当环氧丙烯酸酯含量为40%,二缩三丙二醇双丙烯酸酯含量为50%时,所得涂层的耐蚀性最佳.     

紫外光固化环氧丙烯酸酯涂料的表征

研制了一种用于艺术玻璃彩绘的新型涂料——紫外线固化环氧丙烯酸酯涂料，主要通过涂膜硬度的测定、红外光谱(FTIR)和差示扫描量热分析法(DSC)研究了涂膜固化程度与辐射时间之间的关系，并用紫外光谱和红外光谱研究了引发剂及其引发涂膜固化的机理。     

环氧/丙烯酸树脂复合水性涂料制备中酯化反应规律的研究

通过环氧／丙烯酸树脂间的酯化反应制备了一种新型水性复合乳液,研究了在叔胺作用下,丙烯酸树脂和环氧树脂的反应规律,发现胺的用量、环氧树脂分子质量、体系固含量以及环氧／胺／丙烯酸摩尔比是影响凝胶的重要因素,并利用三角图方法,测定了物理凝胶和非凝胶区域的范围。     

光敏性含磷聚氨酯丙烯酸酯(P-PUA)阻燃预聚物的合成与性能

合成了4种不同结构的光敏性含磷聚氨酯丙烯酸酯阻燃预聚物,并对其结构进行了表征。研究了以所制预聚物为基料的光固化涂料的柔韧性、附着力、硬度等基本物理性能和耐热防火性能。结果表明,该涂料能达到市售PUA涂料的基本物理性能,并具有较高的分解温度,800℃下形成的炭渣能达到涂层原重的20%左右,具有一定的耐热防火性能;以结构相似的阻燃预聚物为基料的涂层,其耐热防火性能随含磷量的增加而提高;预聚物主链中芳环含量也影响涂层的耐热防火性能,相对分子质量相近的预聚物,其主链上的芳环数量增加一倍,涂层在800℃下w(炭渣)能增加5个百分点。     

Strengthen flame retardancy of epoxy thermoset by montmorillonite particles adhering phosphorus-containing fragments

Phosphaphenanthrene derivative tri-(3-DOPO-2-hydroxypropan-1-yl)-1,3,5-triazine-2,4,6-trione (TGD) and organo-modified montmorillonite (OMMT) were jointly introduced into the diglycidyl ether of bisphenol A cured by 4,4-diamino-diphenylmethane (EP) to investigate their flame retardant behaviors. With only addition of 0.5%OMMT and 2.5%TGD, epoxy thermoset achieved a limiting oxygen index value of 33.7% and passed UL 94 V-0 rating test. Compared with the combustion behaviors of 3%OMMT/EP and 3%TGD/EP, an obvious synergistic flame retardant effect between OMMT and TGD can be concluded in OMMT/TGD/EP. Meanwhile, the FTIR spectra of gas-phase and condensed-phase products further proved this synergistic effect working in a physical way. On one hand, the co-existence of hydroxyl-containing TGD enabled montmorillonite (MMT) particles to filtrate and adhere more smoke fragments. On the other hand, the co-action of MMT help the polar phosphorus-containing fragments from TGD better strengthened char layer, enhancing the barrier and protective effect of residue. The synergistic flame retardant effect from OMMT/TGD system endowed themselves with higher flame retardant efficiency, and epoxy thermoset with better flame retardant performance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 47500.     

Preparation of novel biomass humate flame retardants and their flame retardancy in epoxy resin

Humic acid (HA), a biomass material with plentiful oxygen-containing functional groups, showed huge potential to be considered as a promising charring agent in flame retardancy. In this study, this HA was modified with four different metal ions like Fe²⁺, Mn²⁺, Al³⁺, and Cu²⁺ and finally, introduced into the epoxy resin (EP) to enhance the flame retardancy of the EP and the dispersion of these flame retardants into the EP matrix. When 10 wt% of HA-Fe and HA-Mn were incorporated into EP matrix, the limiting oxygen index (LOI) was increased from 21.2% for EP to 26.6 and 25.3% for the EP composites and the peak heat release rate (pHRR) was reduced by 36 and 35.5%, respectively. Such a significant improvement in flame retardancy was attributed to the catalytic charring of HA in the presence of metal ions, which ultimately increased the residual char formation and produced compact char layers during the combustion process to retard the transfer of heat and combustible gases between the EP composites and the flame zone. Finally, this kind of application provided a feasible way for the development of an environmentally friendly flame retardant with high efficiency, which improved the fire safety of EP matrix.