聚醚/聚酯混合型水性UV固化PUA合成研究

为提高紫外光(UV)固化水性聚氨酯丙烯酸酯(WPUA)的综合性能,用异佛尔酮二异氰酸酯(IPDI)、聚醚/聚酯二元醇混合软段、季戊四醇三丙烯酸酯(PETA)等原料合成不同官能度封端剂封端的UV固化WPUA,并采用环氧树脂(E-44)进行接枝改性。实验结果表明:采用聚醚/聚酯混合二元醇作为软段,能有效解决涂膜UV固化前粘性问题,能忍受一定的机械应力,可以固化前堆放,给涂装施工带来极大方便;UV固化后赋予涂膜良好的耐水性、耐溶剂等性能;环氧树脂(E-44)改性能提高产物涂膜的综合性能。     

水性聚氨酯的改性研究

分别采用丙烯酸酯、环氧树脂合成2种不同的改性水性聚氨酯,比较了改性前后及2种不同的改性水性聚氨酯在乳液、涂膜性能及粘接性能方面的差异。结果表明,改性后的水性聚氨酯综合性能明显提高,其中环氧树脂改性水性聚氨酯(EPU)在固化交联后涂膜的耐水、耐溶剂及力学性能又明显好于丙烯酸酯改性水性聚氨酯(PUA),其粘接强度与溶剂型聚氨酯相当;而采用丙烯酸酯改性的水性聚氨酯PUA乳液稳定性好于EPU乳液。     

水性聚氨酯/丙烯酸酯复合乳液的制备及性能研究

以聚四氢呋喃二醇（PTMG）、甲苯二异氰酸酯（TDI）、2,2–双（羟甲基）丙酸（DMPA）和1,4–丁二醇（BDO）为主要原料,经逐步聚合制得水性聚氨酯,并利用红外光谱对其结构进行表征。以水性聚氨酯自乳化包覆丙烯酸酯单体,制备系列水性聚氨酯/丙烯酸酯核壳复合乳液（WPUA）,并探究丙烯酸酯单体含量、种类及壳层水性聚氨酯结构对复合乳液和固化膜性能的影响。结果表明,随着对丙烯酸酯单体的乳化包覆比从0增加到1.2,乳液粒径从24.65 nm增加到543.61 nm,黏度从31.4mPa·s增加到2 571.2 mPa·s,而固化膜的拉伸强度从12.16 MPa先降到6.73 MPa,再升到16.38 MPa,断裂伸长率从1771.4%降到63.8%,材料的耐水性和耐热性得到提高;探究不同丙烯酸酯种类对固化膜性能的影响,结果表明,随着单体官能度的增大,固化膜的拉伸强度明显升高,但断裂伸长率降低;通过改变壳层水性聚氨酯结构表明,线型水性聚氨酯制得的WPUA固化膜拉伸强度较低,为7.25 MPa,但断裂伸长率有325%,而多支链型水性聚氨酯制得的WPUA固化膜拉伸强度较高,达13.94 MPa,...     

纳米氧化锡锑/UV固化水性聚氨酯隔热涂料的制备及其性能表征

以聚酯二元醇、异佛尔酮二异氰酸酯、二羟甲基丙酸、季戊四醇三丙烯酸酯(PETA)等为原料,制备了具有感光性能的水性聚氨酯丙烯酸酯预聚体(PUA),通过溶胶-凝胶法对采用硅烷偶联剂KH570对纳米氧化锡锑(ATO)进行改性,然后将改性纳米ATO与PUA加水乳化制得纳米WPUA/ATO复合乳液,最后通过UV固化制得WPUA/ATO涂膜,研究了ATO含量对WPUA/ATO涂膜性能的影响。结果表明,随着纳米ATO含量增加,可见光平均透过率降低,红外光平均屏蔽率增加;其中当纳米WPUA/ATO复合乳液中ATO质量含量为9%时,可见光平均透过率为71.43%,红外光平均屏蔽率高达为79.69%,隔热性能较好,特别适合制备涂膜隔热玻璃。     

水性紫外光固化真空镀膜涂料的制备与性能研究

合成了具有高交联密度的水性聚氨酯丙烯酸酯分散体和高相对分子质量的水性丙烯酸酯分散体,并复配多官能度丙烯酸酯单体、光引发剂制备了水性紫外光(UV)固化真空镀膜涂料。分析研究了各组分对涂膜性能的影响,确定了最优配方。研制的水性UV涂料固化速度快、附着力优异、耐热性能好、上镀性佳,在真空镀膜领域具有良好的适应性。     

改性UV固化水性聚氨酯丙烯酸酯合成研究

采用异佛尔酮二异氰酸酯(IPDI)、聚醚硅氧烷二元醇(WACKER IM 22、IM15)/聚酯二元醇(7112)混合软段、二羟甲基丙酸( DMPA)/聚乙二醇(PEG600)混合亲水基(扩链剂)、季戊四醇三丙烯酸酯(PETA)等原料合成多官能度的综合改性UV固化水性聚氨酯丙烯酸酯(WPUA);实验结果表明:采用阴/非离子混合型亲水基能提高WPUA产品稳定性,改性产品固化后膜的耐水性、耐碱性、耐溶剂性能明显提高,综合性能优良.     

水性聚氨酯–丙烯酸酯发展近况

介绍了不同类型水性聚氨酯–丙烯酸酯(WPUA)的合成方法、性能以及合成条件对产品性能的影响;重点综述了向聚氨酯中引入丙烯酸酯基体后,UV固化WPUA的固化性能和应用性能的改善。所涉及的WPUA类型包括由不同聚氨酯和不同丙烯酸酯合成的WPUA、氟化WPUA、含硅WPUA、超支化WPUA等。简要介绍了WPUA的应用。     

氨基树脂改性水性聚氨酯-丙烯酸酯复合乳液的制备及性能

通过甲基丙烯酸甲酯(MMA)与聚氨酯(PU)种子乳液共聚合成了水性聚氨酯-丙烯酸酯(PUA)复合乳液,然后用氨基树脂(HMMM)对其进行交联,并对HMMM改性的PUA复合乳液的性能进行了表征.结果表明,制备稳定的PUA复合乳液适宜的MMA质量分数约为20%,PUA复合乳液涂膜的玻璃化转变温度随HMMM用量的增加而升高,于120 ℃固化30 min的乳液涂膜比室温固化的涂膜表面更加光滑.     

紫外光固化WPUA/WATO纳米透明隔热涂料的制备

合成了可紫外光固化的水性聚氨酯丙烯酸酯乳液(WPUA),并与水性纳米氧化锡锑分散液(WATO)共混制备了UV固化WPUA/WATO纳米透明隔热涂料。考察了不同WATO添加量对涂料黏度、贮存稳定性、粒径分布及涂层综合性能、光学性能和隔热性的影响。结果表明WATO添加量为15%时,涂膜综合性能最好,隔热性能较好,平衡温差5.0°C,红外光阻隔率为80.2%,可见光透过率为80.3%。     

聚氨酯丙烯酸酯齐聚物制备紫外光固化胶粘剂

按正交实验的方法,采用自制的聚氨酯改性丙烯酸酯齐聚物(PUA)与改性剂,研制出了紫外光(UV)快速固化胶粘剂,并对其影响因素进行了简要分析。结果表明,由PUA改性的UV固化胶粘剂具有较好的粘接性能。在所考察的影响因素中,对胶粘剂强度的影响程度大小顺序为:自制改性剂>1,6-己二醇二丙烯酸酯(HDDA)/三羟甲基丙烷三丙烯酸酯(TPGDA)>聚酯丙烯酸酯(EB-524)/PUA齐聚物≈多官能度单体>单官能度单体=KH570>光引发剂。     

Preparation and properties of UV‐curable waterborne polyurethane–acrylate emulsion

Polyurethane–acrylate oligomer terminated with multiple unsaturated bonds was prepared using isophorone diisocyanate, (IPDI), methylene diphenyl diisocyanate, and polyols as monomers, using 2,2‐dimethylol propionic acid as hydrophilic chain extender, together with pentaerythritol triacrylate (PETA) as end‐capper. The UV‐curable waterborne polyurethane–acrylate (UV‐WPUA) composite emulsion was obtained by mixing the PUA oligomer with certain content of reactive diluents and then dispersing the mixture in water. The molecular structure of the polyurethane prepolymer, PUA oligomer, and UV‐cured polymer was investigated by Fourier transform infrared spectroscopy. The influence of the composition and content of the diluents and end‐capper on UV‐WPUA properties, including the emulsion stability, thermal property, water resistance, adhesion, hardness, glossiness of polymer film were studied. The results show that the WPUA emulsion has excellent stability, and the UV‐cured film features good hardness and remarkable water resistance when PETA is used as end‐capper and the end‐capping ratio of the polyurethane prepolymer is 70% and dipentaerythritol hexaacylate/dipropylene glycol diacrylate (mass ratio 1:1) is used as diluent. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45208.     

丙烯酸酯用量对溶胀-嵌段型水性聚氨酯性能的影响

以甲基丙烯酸甲酯（MMA）、丙烯酸正丁酯（BA）为单体,通过巯基乙醇链转移自由基无规共聚合成端羟基聚丙烯酸酯（PA-OH）,采用嵌段共聚法将PA-OH与水性聚氨酯（WPU）嵌段,通过预聚体分散法制得聚丙烯酸酯嵌段水性聚氨酯乳液（WPUA）,进而通过乳液聚合法制备了一系列以MMA/BA为单体的聚丙烯酸酯嵌段-溶胀水性聚氨酯复合乳液（WPUA-PA）,结果表明WPUA-PA中丙烯酸酯量最多可达到WPUA的240%,当丙烯酸酯量为WPUA的120%时WPUA-PA的性能最佳,此时乳液平均粒径为68 nm、粒径分布指数为0.174,胶膜拉伸强度为13.88 MPa、断裂伸长率为558.3%、吸水率为4.94%,且具有优异的乳液稳定性。     

聚氨酯-聚丙烯酸酯共聚乳液的制备及形态研究

以聚醚二元醇(GE-210)、异佛尔酮二异氰酸酯(IPDI)和二羟甲基丙酸(DMPA)为主要原料,制备了水性聚氨酯(WPU)乳液;再采用丙烯酸丁酯(BA)和甲基丙烯酸甲酯(MMA)与WPU乳液共聚制备水性聚氨酯-聚丙烯酸酯(WPUA)复合乳液。讨论了WPUA乳液及胶膜的性能,并采用FT-IR、XRD、SEM和AFM等分析手段研究了WPUA涂膜的结构和形貌。结果表明,WPUA乳液具有良好的室温贮存稳定性及成膜性能,胶膜为无定型结构,透光率90%。与WPU乳液相比,WPUA乳液粒径有所增大,对基材的浸润性更好;其胶膜耐水性能明显提高;SEM和AFM分析同时显示,WPUA胶膜微观呈现"脊-谷"结构。     

丙烯酸酯改性ANGE-PCDL型WPUA的合成与表征

以丙烯海松酸新戊二醇酯(ANGE),聚碳酸酯二元醇(PCDL)、丙烯酸/3-AE丙Al-( HPA)、异佛尔酮二异氰酸酯(IPDI)、二劲甲基丙酸(DMPA)为主要原料,制备了ANGE-PCDL型水性聚氨酯分散体(WPU);滴加丙烯酸酯单体到WPU中,得到了PCDL-ANGE型水性聚氨酯-丙烯酸酯复合乳液(WPUA)....     

丙烯酸酯改性水性聚氨酯的研究进展

介绍了丙烯酸酯改性水性聚氨酯乳液(PUA)的制备方法,其中包括乳液型丙烯酸酯改性水性聚氨酯、单体丙烯酸酯改性水性聚氨酯、溶剂型丙烯酸酯低聚物改性水性聚氨酯,指出了各改性方法的优缺点;概述了国内外的研究现状,对丙烯酸酯改性水性聚氨酯前景进行了展望。     

UV-curable waterborne polyurethane acrylate modified with octavinyl POSS for weatherable coating applications

UV-curable waterborne polyurethane acrylate (WPUA) modified with octavinyl polyhedral oligomeric silsesquioxane (OVPOSS) was prepared via photopolymerization between OVPOSS and WPUA. Structural and morphological features of WPUA/OVPOSS coatings were assessed using Fourier transform infrared spectroscopy, transmission electron microscopy and X-ray diffraction. Thermal properties of the WPUA/OVPOSS hybride coatings have been improved over the pure waterborne polyurethane acrylate analyzed by thermal gravimetric analysis. Performance of the coatings was also evaluated using water absorption, hardness, contact angle, X-ray photoelectron spectroscopy (XPS). The data showed that the WPUA/OVPOSS coatings possessed better water resistance and thermal oxidative stability in comparison with pure WPUA.     

Preparation and properties of modified graphene oxide incorporated waterborne polyurethane acrylate

In this study, a new modifier (KPG) was prepared by modifying graphene oxide with γ‐glycidoxypropyl trimethoxysilane (KH560) and polydimethylsiloxane (PDMS). KPG was in turn added to aqueous urethane acrylate for the fabrication of waterborne polyurethane polyacrylate emulsion modified with KH560‐PDMS composite (KPG/WPUA). Textural characterizations of the KPG/WPUA coating were achieved via Fourier transform infrared, SEM, TGA and AFM techniques, which revealed that the KPG/WPUA film possessed a smooth surface. The synthesized KPG/WPUA films were tested for mechanical properties, hydrophobicity and acid/water corrosion performance which suggested their highly hydrophobic surface. KPG/WPUA with 0.1% KPG showed a contact angle of 118.35°, 30.35° higher than that of pristine WPUA. The KPG/WPUA film exhibited higher thermal stability, i.e. a 5% weight loss temperature of 305 °C, which was 30 °C higher than that of pristine WPUA film. The Young's modulus and elongation at break of the KPG/WPUA film were 34.1 MPa and 74.88% respectively, which were higher than that of WPUA film. Furthermore, KPG/WPUA films exhibited greater resistance (without obvious blistering and the white spotting phenomenon) to H₂O₂, HCl and water corrosion than pristine WPUA. The superior performance of KPG/WPUA films was attributed to the network chain structure formed upon the introduction of KPG into WPUA. The outstanding performance of KPG/WPUA films in terms of mechanical properties, thermal stability and high resistance to acidic and water corrosion makes them interesting alternative contenders for target applications. © 2019 Society of Chemical Industry     

丙烯酸酯改性水性聚氨酯的合成及应用研究

以异氰酸酯、聚醚多元醇及二羟甲基丙酸(DMPA)为主要原料,合成了水性聚氨酯(WPU)预聚体;然后采用扩链、交联和丙烯酸酯复合改性等方法制备了丙烯酸酯改性水性聚氨酯(PUA)。结果表明:水性PUA具有丙烯酸酯和聚氨酯(PU)的双重优点,而且其低温成膜性较好、综合性能较优、成本及VOC含量较低;由PUA配制的木器漆,其主要性能均达到HG/T36082-1999标准。     

Preparation,mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

The waterborne polyurethane (PU) prepolymer was first prepared based on isophorone diisocyanate, polyether polyol (NJ‐210), dimethylol propionic acid (DMPA), and hydroxyethyl methyl acrylate via in situ method. The crosslinked waterborne polyurethane‐acrylate (PUA) dispersions were prepared with the different functional crosslinkers. The chemical structures, optical transparency, and thermal properties of PU and PUA were confirmed by Fourier transform infrared spectrometry, ultraviolet–visible spectrophotometry, and differential scanning calorimetry. Some physical properties of the aqueous dispersions such as viscosity, particle size, and surface tension were measured. Some mechanical performances and solvent resistance of PUA films were systemically investigated. The experimental results showed that the particle sizes of the crosslinked PUA aqueous dispersions were larger than the PU and increased from 57.3 to 254.4 nm. When the ratios of BA/St, BA/TPGDA, and BA/TMPTA were 70/30, PUA films exhibited excellent comprehensive mechanical properties. The tensile strength and elongation at break of the film were 2.17 MPa and 197.19%. When the ratio of BA/St was 30/70, the film had excellent water resistance and was only 6.47%. The obtained PUA composites have great potential application such as coatings, leather finishing, adhesives, sealants, plastic coatings, and wood finishes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012