膨胀型硅丙乳液防火涂料

本文介绍了以硅丙乳液为成膜物 ,添加成炭剂、阻燃剂、发泡剂制成的膨胀型防火涂料的组成、生产方法、性能及特点     

膨胀型硅丙乳液防火涂料的研究

以硅丙乳液为基料，按正交设计法进行实验，用耐燃时间为主要考察指标，对阻燃体系中各组分的配比进行了研究和优化设计，制备出防火性能好、各项技术性能优异的膨胀型防火涂料。     

乳液种类对膨胀型防火涂料理化性能和防火性能的影响

配制了以聚醋酸乙烯酯(PEA)乳液、苯丙乳液和纯丙乳液为成膜基料的乳液型膨胀防火涂料,通过涂料常规性能测试和小室燃烧试验,对3种涂料的理化性能和防火性能进行了比较分析.结果表明,PEA乳液型涂料质量损失大,炭化体积最小,膨胀效果极佳,防火效果最好;纯丙乳液型涂料的理化性能最好;而苯丙乳液型涂料则兼有理化性能和防火性能的优点,成本低、环保性强,可以满足防火涂料的各项需要.     

膨胀型饰面防火涂料贮存稳定性和耐水性研究

通过对防火涂料贮存后耐水性差、贮存返粗、增稠、原因研究,发现涂料基料和阻燃剂是产生涂料贮存不稳定的主要原因。采用乳液共混改性基料和微波辐射技术改性膨胀阻燃剂,显著提高了防火涂料的贮存稳定性,耐水性能由12h提高到32h,阻燃时间由23min提高到58min。     

UV固化环氧/SiO_2杂化涂料的稳定性与阻燃性能EI北大核心CSCD

以正硅酸乙酯和γ-甲基丙烯酰氧基丙基三甲氧基硅烷为原料,采用溶胶-凝胶方法制备了一系列不同摩尔比的SiO_2溶胶。将溶胶与活性稀释剂三丙二醇二丙烯酸酯、环氧丙烯酸酯树脂混合得到UV固化杂化涂料。对杂化涂料的保存稳定性进行了详细分析;利用红外光谱对溶胶及涂料结构进行了表征;通过热重分析、微量量热(MCC)等测试方法研究了SiO_2含量对杂化涂层热稳定性、阻燃性能及力学性能的影响。结果表明,添加SiO_2有利于提高杂化涂层的热稳定性和力学性能。当SiO_2溶胶质量分数为50%时,杂化涂层的硬度从3H增加到6H。耐磨系数从0.0852g/100r下降到0.0606g/100r。MCC分析显示,溶胶质量分数为40%的杂化涂层热释放峰值和热释放总量较有机涂层分别下降了41.98%和41.12%,表现出良好的阻燃特性。     

溶胶-凝胶法制备有机硅/SiO2杂化涂料的稳定性

以正硅酸乙酯(TEOS)、二乙氧基二甲基硅烷(DDS)、有机硅烷偶联剂(MPTMS和VTMS)为原料,采用sol-gel法制备了可UV固化的有机硅/SiO2杂化涂料,并考察了原料配比对杂化涂料稳定性的影响。结果表明:DDS-MPTMS/SiO2比DDS-VTMS/SiO2稳定性更好;乙醇用量增加有利于提高储存稳定性;随着陈化时间延长,杂化涂料粒径变大,分布变宽,漆膜透光率下降。当各组分的摩尔比为nDDS/nTEOS=2/3,nMPTMS/nTEOS=1/3,nHCl/nSi-O=0.006,nEtOH/nSi-O=1,nH2O/nSi-O=0.6时,杂化涂料稳定性最佳。在此条件下制备的杂化涂料平均粒径3.6 nm,凝胶时间大于300 d,经UV固化后漆膜的性能最好。     

溶胶-凝胶法制备有机/无机纳米杂化涂料的现状及展望

溶胶-凝胶法制备的有机/无机纳米杂化涂料具有许多优点。介绍了溶胶-凝胶法制备有机/无机纳米杂化涂料的研究现状,并对此作出了展望。     

原位乳液接枝法制备聚丁二烯/SiO_2杂化材料

在聚丁二烯(PB)胶乳中进行乳液自由基反应,将乙烯基三乙氧基硅烷(VTES)接枝到聚丁二烯分子链上,制备了聚丁二烯/SiO2杂化材料。运用硅含量、交联率、傅立叶变换红外光谱(FT-IR)、热失重分析(TGA)对产物结构进行了表征,考察了产物多种性能的变化情况,并探讨了杂化材料的形成机理。结果表明,VTES通过共价键合在PB链上,并与水解缩合形成的硅核连接,利用率达88.6%;接枝后产物凝胶率提高,分解速率降低,力学性能如门尼黏度、拉伸强度和断裂伸长率均显著改变。     

新型聚氨酯防火涂料的阻燃抑烟性能研究

本文主要阐述了采用锥形量热仪法测试由聚磷酸铵(APP)/新型成炭剂(Carbonific)/聚氨酯(PU)清漆所构成的防火阻燃体系的阻燃、抑烟性能,并和聚氨酯(PU)清漆体系的性能进行对比,分析了该体系阻燃、抑烟的原因.     

自交联聚氨酯-丙烯酸酯杂化乳液的制备及其膜性能研究

以异佛尔酮二异氰酸酯(IPDI)、聚己内酯二醇(PCL)、二羟甲基丁酸(DMBA)、双丙酮丙烯酰胺(DAAM)等为主要原料,采用乳液聚合法合成了常温自交联聚氨酯-丙烯酸酯杂化乳液。通过傅里叶红外光谱(FT-IR)、激光粒度分析仪、热重分析(TGA)等研究了DAAM单体含量、n(DAAM)/n(ADH)比值对乳液及涂膜性能的影响。结果表明,当m(DAAM)=2%,n(DAAM)/n(ADH)=2∶1时,所得杂化乳胶膜的耐水性、力学性能和热稳定性最优。     

原位无皂乳液聚合制备纳米SiO2/聚丙烯酸酯杂化材料纸张表面增强剂的性能研究

以聚乙烯醇为胶体保护剂,正硅酸乙酯为前躯体,通过无皂乳液聚合法合成了SiO_2/聚丙烯酸酯杂化材料纸张表面增强剂.通过红外光谱(IR)、差示扫描量热(DSC)、热重分析(TGA)和透射电镜(TEM)对杂化材料进行表征,结果表明纳米SiO_2和丙烯酸酯之间产生了化学键的结合,无机相的引入使杂化材料的热分解温度升高.初步应用实验结果表明,当增强剂用量为1%时,纸张的环压指数提高36%,抗张强度提高30%,撕裂度提高31%,拉毛强度提高30%.     

丙烯酸丁酯-苯乙烯共聚乳液型吸油树脂的合成及性能研究

以丙烯酸丁酯(BA)和苯乙烯(St)为单体,二乙烯基苯(DVB)为化学交联剂,采用乳液合成法制备吸油树脂.通过正交实验得到最佳合成配方,即BA∶ St=2∶1,w(二乙烯苯)=2％,w(过硫酸钾)=1％,w(丁苯橡胶)=O％,二甲苯的吸收率达到8.73g/g.同时探索了单体配比、DVB用量、油品种类对树脂吸油性能的影响...     

丙烯酸酯接枝改性聚氨酯乳液的结构与性能

采用原位接枝聚合方法制备丙烯酸酯接枝改性聚氨酯乳液 ,通过电镜、差示扫描量热 (DSC)、热重分析 (TG)、耐水、耐溶剂性测定等研究了接枝改性聚氨酯乳液的结构与性能 ,证实丙烯酸酯在聚氨酯分子链上接枝。接枝共聚物的热稳定性、耐水耐溶剂性优于商品聚氨酯     

聚醚胺固化环氧有机硅杂化涂层的制备及防腐蚀性能研究

使用3种不同结构的聚醚胺(Jeffamine D230,D400,T403)分别固化环氧有机硅杂化树脂制备出有机-无机杂化涂层,并与3-氨丙基三乙氧基硅烷(APTES)固化的杂化涂层在机械性能、附着力和防腐蚀性能上进行了比较。研究结果表明,与APTES相比,聚醚胺可以提高杂化涂层的耐冲击高度1倍以上;聚醚胺D230和T403没有降低杂化涂层的硬度,而D400降低了杂化涂层的硬度;聚醚胺可以明显提高杂化涂层的初始附着力,同时大幅改善了涂层在老化过程中的"湿附着力"。采用盐雾实验和交流阻抗测试研究了杂化涂层的耐腐蚀性能,结果表明聚醚胺固化剂明显改善了APTES固化杂化涂层的易开裂性,并提高了杂化涂层的耐腐蚀性能。     

聚氨酯与聚丙烯酸酯混合乳液(PU+PA)共聚氯乙烯复合树脂的性能研究

采用预聚体分散法,以甲苯2,4-二异氰酸酯(TDI)、聚醚(PPG)和二羟甲基丙酸(DMPA)为主要原料,用三乙胺(TEA)为中和剂合成了阴离子水性聚氨酯(PU);以丙烯酸丁酯(BA)为原料,采用乳液聚合的方法制备聚丙烯酸酯乳液(PA),并与PU共混形成(PU+PA)混合乳液。在高压釜中以混合乳液为种子进行氯乙烯(VC)原位共聚,制备了(PU+PA)/PVC复合乳液树脂。通过电子万能试验机、冲击试验机、扫描电子显微镜(SEM)、TA-2000热分析仪和维卡软化点温度测定仪等手段对(PU+PA)/PVC复合树脂进行了测试和表征。结果表明:耐热性较好的PA的加入,不但提高了材料的耐热性能,还能有效地改善复合树脂的抗缺口冲击强度。当PA/PU为4/6,聚醚分子量为3000时,(PU+PA)/PVC复合树脂的缺口冲击强度最大。     

Microstructure characteristics of Ni-based WC composite coatings by laser induction hybrid rapid cladding

To avoid low cladding rate and cracks of cladding layer, laser induction hybrid rapid cladding (LIHRC) has been put forward in the paper. The microstructure characteristics of Ni-based WC composite coatings at the different laser scanning speed were investigated. For low laser scanning speed, the growth of γ-nickel was characterized by coarse columnar dendrites and eutectics, blocky W₂C + Fe₃W₃C carbides, and bar-like (W, Cr, Ni)₂₃C₆ carbides were formed. With increasing laser scanning speed, the growth of γ-nickel presented the fine dendrites and eutectics, the only blocky mixed carbides were precipitated and identified as W₂C + FeW₃C + W₆C_2.54 carbides. With further increasing laser scanning speed, the growth of γ-nickel was characterized by cellular crystals and eutectics, the only blocky carbides were identified as W₂C + W₆C_2.54. Moreover, experimental results showed that the efficiency of LIHRC was increased much four times higher than that of laser cladding without preheating, ceramic–metal composite coatings detected were free of cracks and had a good metallurgical bonding with substrate.     

The influence of pH and bath composition on the properties of Ni-Co coatings synthesized by electrodeposition

Ni-Co coatings were produced on Cu substrates by electrodeposition from electrolytes with different pH values and different Co²⁺ concentration. The current efficiency increases from 52.1% to 81.2% with the pH increasing from 2.0 to 5.4. It is clearly observed that the content of cobalt in the deposited coatings gradually increases from 9.4% to 19.6% as the pH value varies from 2.0 to 5.4. The Co content in the deposited coatings increases from 16.5% to 72.7% as the molar ratio of CoSO₄/NiSO₄ varying from 1:5 to 1:2 in electrolyte. XRD patterns reveal that the structure of the coatings strongly depends on the Co content in the binary coatings. Both granular and dendritic crystals were investigated by SEM and the different crystallization behaviors were illustrated. The saturation magnetization of the coatings goes up from 96.36 kAm⁻¹ to 136.08 kAm⁻¹ with the pH value increasing from 2.0 to 5.4. The saturation magnetization (M_s) and coercivity (H_c) move up from 144.84 kAm⁻¹ and 15.27 kAm⁻¹ to 175.13 kAm⁻¹ and 125.20 kAm⁻¹ with the increase of Co in the electrolyte, respectively.