可紫外光固化丙烯酸阴极电泳涂料的制备及性能

用甲基丙烯酸甲酯、丙烯酸丁酯、甲基丙烯酸N,N-二甲氨基乙酯(DMAEMA)和甲基丙烯酸羟乙酯(HEMA)合成了羟基丙烯酸树脂,然后用3-异丙基-二甲基苄基异氰酸酯(TMI)对其进行接枝,引入不饱和键,制备出可紫外光(UV)固化的树脂,并用其配制成阴极电泳漆。探讨了DMAEMA、HEMA和TMI用量对树脂以及漆膜性能的影响并确定了最优用量:DMAEMA占总单体质量的10%~14%,HEMA 15%~20%,TMI 14%~19%。所制涂料的性能与国外同类产品相当。     

金属镀膜用UV固化阴极电泳涂料的制备及性能研究

由甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（n-BA）、甲基丙烯酸二甲氨基乙酯（DMAEMA）和甲基丙烯酸羟乙酯（HEMA）合成了一种含羟基丙烯酸树脂。由异佛尔酮二异氰酸酯（IPDI）和丙烯酸羟乙酯（HEA）合成了半封闭异氰酸酯（IPDI-HEA）半加成物。将上述两者进行接枝反应,制备了光敏性丙烯酸酯树脂,经乳化得到丙烯酸酯乳液,最后经电泳和UV固化制备了阴极电泳涂膜。采用傅里叶变换红外光谱仪表征产物的结构,同时考察了单体用量和IPDI-HEA接枝率对漆膜性能的影响。研究结果表明：当热引发剂与链转移剂的质量分数分别为2.0%与0.3%、亲水基团DMAEMA的质量分数为12%（均相对于丙烯酸酯单体总量而言）、IPDI-HEA与HEMA的接枝比例控制在n(IPDI-HEA)∶n(HEMA)=8∶10时,所得乳液为乳白色蓝色相;乳液状态稳定,电导率好,整体性能优异;电泳所得漆膜光滑,附着力好,光泽高,硬度高,符合预期要求。     

紫外光固化阴极电泳涂料用丙烯酸树脂的合成及应用

以甲基丙烯酸二甲胺乙酯(DMAEMA)、甲基丙烯酸羟乙酯(HEMA)、丙烯酸异辛酯(EHA)、甲基丙烯酸甲酯(MMA)和苯乙烯(St)为共聚单体制备了阳离子型丙烯酸树脂,再利用含异氰酸根的不饱和单体对其进行接枝改性得到光敏树脂,合成了紫外光(UV)固化阴极电泳涂料.红外光谱表征证明得到了目标产物.考察了电泳工艺对漆膜厚度、闪蒸条件对漆膜性能以及光固化条件对双键转化率的影响,获得了最佳电泳工艺为、闪蒸工艺和固化条件,分别为:电泳电压80 V,电泳时间90 s;闪蒸温度80 ℃,闪蒸时间5min;引发剂用量3%(质量分数),固化时间70 s,此条件下固化所得漆膜平整、光亮,性能优异.     

高附着力丙烯酸阴极电泳涂料树脂的合成及应用

采用自由基溶液聚合法,以甲基丙烯酸四氢糠基酯(THFMA)、甲基丙烯酸羟乙酯(HEMA)、甲基丙烯酸二甲胺基乙酯(DMAEMA)、甲基丙烯酸异冰片酯(IBOMA)、N-羟甲基丙烯酰胺(NMA)等单体合成了高附着力丙烯酸阴极电泳涂料用树脂.研究树脂漆膜外观及性能的几种影响因素.实验结果表明:THFMA用量为15％,以偶氮二异丁腈为引发剂,槽液pH控制在5.8左右,可得到平整丰满漆膜,其附着力为0级,光泽可达130.4,膜厚为21.4μm.可广泛应用与五金、汽车等行业.     

阴极电泳涂料用高固体分丙烯酸树脂的合成

采用甲基丙烯酸异冰片酯(IBOMA)、甲基丙烯酸二甲胺乙酯(DMAEMA)等(甲基)丙烯酸酯类单体合成阴极电泳涂料用高固体分自交联型丙烯酸树脂。研究发现,引入低表面张力、带非极性多环酯基的IBOMA可降低树脂的黏度,提高合成树脂的固体质量分数到75%甚至更高;当单体的滴加时间控制在3～3 5h,采用m(偶氮二异丁腈)∶m(过氧化苯甲酸叔戊酯)=1∶(0 3～0 5)的混合引发剂,w(混合引发剂)=2%～4%时,能获得相对分子质量大小及分布适宜的水溶性高固体分自交联聚合物;研究聚合物水溶性和涂膜交联性的影响因素发现,w(DMAEMA)=16%、w(甲基丙烯酸羟乙酯)=15%、w(N 丁氧甲基丙烯酰胺)=6%时,树脂的水溶性较佳,涂膜的交联度可达90%;引入了丙烯酸作为共聚物自交联的潜催化剂,差示扫描式量热法(DSC)分析表明,w(丙烯酸)=1%时,可显著降低树脂的固化反应温度。     

阴极电泳涂料用高硬度丙烯酸酯树脂的研制

以甲基丙烯酸丁酯(BMA)和甲基丙烯酸甲酯(MMA)为主要硬单体、N-羟甲基丙烯酰胺(NMA)和甲基丙烯酸羟乙酯(HEMA)为自交联单体,加入封闭型异氰酸酯固化剂,合成了一种阴极电泳涂料用丙烯酸酯树脂。研究了不同质量比的单体、自交联单体以及固化剂与树脂的不同配比对涂料涂膜性能的影响。结果发现,BMA和MMA的用量分别为单体总量的30%和16%,NMA和HEMA以质量比为3:15进行自交联,加入与基料树脂质量比为1:3的固化剂,所得的涂膜外观平整光亮,性能优良:硬度达到5H,附着力1级,抗冲击强度35kg·cm,耐碱性实验(在0.1mol/LNaOH溶液中)240h,耐酸性实验(在0.1mol/LH2SO4溶液中)72h。     

丙烯酸环氧自交联阴极电泳涂料的研制

研究了以环氧树脂为母体，与丙烯酸单体接枝共聚物组成的自交联阴极电泳涂料的配方和合成工艺条件，讨论了环氧树脂的分子量、丙烯酸单体配比、接枝共聚反应温度与时间和有机胺对漆膜性能的影响。     

自交联型硅丙乳液的合成及其固化漆膜性能研究

以苯乙烯、丙烯酸丁酯、甲基丙烯酸乙酰乙酰氧基乙酯(AAEM)、γ-甲基丙烯酰氧基丙基三甲氧基硅烷(A-174)和双甲基丙烯酸乙二醇酯(EGDMA)为共聚单体,采用半连续种子乳液聚合工艺,成功地合成了自交联型硅丙乳液树脂,室温固化7天后获得了耐水性良好的硅丙漆膜。探讨了A-174和EGDMA用量对单体转化率、凝聚率以及乳胶粒粒径的影响,并研究了固化漆膜的性能。结果表明,A-174和EGDMA的引入对单体转化率的影响不大,但是含量过高时会导致乳胶粒的粒径增大,体系凝聚率提高。当A-174用量为质量分数9%、EGDMA用量为质量分数2%时,此时乳液树脂的硅含量较高,且聚合体系具有较高的单体转化率和较低的凝聚率。自交联单体EGDMA用量对固化漆膜的性能影响很大。当EGDMA用量为质量分数2%时,固化漆膜光滑平整,机械性能和耐水性最佳。     

丙烯酸乳液的合成及其在塑料基材上的应用

以苯乙烯(St)、甲基丙烯酸甲酯(MMA)和丙烯酸-2-乙基己酯(2-EHA)为主单体,甲基丙烯酸羟乙酯(HEMA)、甲基丙烯酸(MAA)、双丙酮丙烯酰胺(DAAM)和己二酸二酰肼(ADH)为功能性单体,通过功能单体MAA和HEMA来改善合成的乳液成膜时与塑料基材的界面接触,提高附着力。由实验得出:当乳液设计种子用量占预乳液的3%,Tg为60℃,MAA用量占单体总量的3%,HEMA用量占单体总量的3%,DAAM用量为单体总量的4%时,合成的交联型丙烯酸酯乳液配制成塑料涂料在PC、ABS板上具有硬度高、附着力优异和耐乙醇擦拭性能好等优点。     

水性羟基丙烯酸乳液的制备及在双组分水性聚氨酯涂料中的应用

以甲基丙烯酸羟乙酯(HEMA)、苯乙烯(St)、丙烯酸正丁酯(n-BA)、甲基丙烯酸甲酯(MMA)和丙烯酸(AA)为主单体,以过硫酸铵(APS)为引发剂,十二烷基二苯醚二磺酸为乳化剂,碳酸氢钠为缓冲剂,通过半连续乳液聚合工艺合成了双组分水性聚氨酯涂料用丙烯酸乳液。探究了丙烯酸单体用量、T_g、引发剂(APS)用量和乳化剂用量对乳液及涂膜性能的影响。结果表明当丙烯酸单体用量占单体总量的1%(质量分数,后同)、APS占单体总量的1%、乳化剂占3%、T_g设计为30℃时,合成的水性羟基丙烯酸乳液制备双组分聚氨酯涂料,其涂膜附着力好、耐水性好,铅笔硬度可达2H。     

水性紫外光固化超支化聚氨酯的制备

以聚环氧丙烷二醇醚(PPG1000)、季戊四醇、2,2-二羟甲基丙酸(DMPA)和异佛尔酮二异氛酸酯(IPDI)为主要聚合单体,甲基丙烯酸羚乙酯(HEMA)为封端剂,合成了超支化紫外光固化水性聚氨醋树脂.研究了各组分用量对涂膜性能的影响,确定了较佳工艺条件,并用红外光谱和核磁共振谱对该超支化聚氨醋树脂的结构进行了表征....     

Grafting of pH-sensitive poly (N,N-dimethylaminoethyl methacrylate-co-2-hydroxyethyl methacrylate) onto HNTS via surface-initiated atom transfer radical polymerization for controllable drug release

Copolymer brushes composed of N,N-dimethylaminoethyl methacrylate (DMAEMA) and 2-hydroxyethyl methacrylate (HEMA) were tethered on the surface of HNTs (HNTs) through surface-initiated atom transfer radical polymerization (SI-ATRP). ATRP initiator was anchored to surface and copolymers were synthesized from surface with different compositions of monomers. Successful grafting of copolymer brushes was approved by FTIR, TGA, XPS, FE-SEM, TEM, and N₂ adsorption-desorption.¹H NMR was used to determine the composition of copolymers. pH-sensitive properties of copolymer-grafted nanotubes were investigated by UV-visible absorbance in different pH values. Finally, loading and in vitro drug release from neat and copolymer-grafted HNTs were investigated using diphenhydramine hydrochloride as a model drug. Incorporation of DMAEMA to structure of polymers led to pH sensitivity of grafted-copolymers and controlled release of drug upon varying the pH of release medium. pH-dependent drug release showed that drug release was increased by decreasing pH of release medium and increasing DMAEMA content.     

Hydrogel coating of RVNRL film by electron‐beam irradiation

The tackiness properties of radiation‐vulcanized natural rubber latex (RVNRL) film surfaces coated by various monomers were investigated in order to define the suitable hydrogels which reduce the tackiness of the film. In this context, different types of monomers, namely, N‐vinyl‐2‐pyrrolidone (NVP), N,N‐dimethylaminoethylamide (DMAEA), acrylic acid (AAc), n‐butyl acrylate (n‐BA), and 2‐hydroxyethyl methacrylate (HEMA) as well as the monomer mixtures were tried with varying degrees of success. Coating the RVNRL film with 80% HEMA/20% n‐BA by irradiation at 80 kGy using a low‐energy electron beam gave a remarkable reduction in the surface tackiness of the RVNRL film. Several other attempts were made such as priming the RVNRL film with acid and aluminum sulfate prior to coating, mixing the aluminum sulfate into the monomer mixtures, and dipping the partially wet RVNRL film into the monomer to enhance the wettability of the monomers with the film. The photomicrographs taken illustrate that the decrease in tackiness with the coating is due to the increase of the surface roughness at an 80‐kGy irradiation dose. The studies also revealed that the reduction in the contact angle and the increase in water absorption of the RVNRL film after irradiation are due to the formation of the hydrogel layer. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 1421–1428, 1999     

水稀释丙烯酸酯分散体及其双组分涂料的制备研究

以甲基丙烯酸甲酯、丙烯酸丁酯、甲基丙烯酸丁酯、甲基丙烯酸为主要单体,采用自由基溶液聚合和相反转的方法合成了水稀释丙烯酸酯树脂分散体（WPA）。加入聚碳化二亚胺类固化剂（PCDI）进行交联固化,得到双组分丙烯酸酯树脂涂料。探讨了影响该分散体性能的各种因素,并对交联固化反应机理和条件进行了研究,运用FT-IR、DSC对树脂进行结构表征。结果表明：当甲基丙烯酸占单体总量的8%,引发剂占1.5%,链转移剂占0.4%,溶剂与单体总量比为0.3∶1.0时分散体性能较好;当固体分质量比WPA/PCDI为3∶1~5∶1时,涂膜先在60℃闪蒸15 min,然后常温放置72h,双组分涂膜性能较佳。     

Preparation and characterization of polyelectrolyte copolymers containing methyl methacrylate,and 2-hydroxyethyl methacrylate. II. Polymers based on dimethylaminoethyl methacrylate

Co- and terpolymers containing dimethylaminoethyl methacrylate (DMAEMA), methyl methacrylate (MMA), and 2-hydroxyethyl methacrylate (HEMA) were prepared by solution polymerization, and characterized by dilute solution viscometry and proton and carbon-13 nuclear magnetic resonance spectroscopy. Polymers were prepared containing 75, 60, 40, 25, and 10 mol % DMAEMA but with differing levels of MMA and HEMA. Polymer solutions were titrated under nitrogen to obtain variations of pKb with alpha (the extent of protonation of the DMAEMA residue). From these experiments, we were able to show that, as expected, the cooperative nature of the ionization process decreased as the level of DMAEMA in the polymer was reduced from 75 mol % to 10 mol %. By comparing polymers containing similar amounts of DMAEMA monomer, we were also able to show that base strength increased with the polarity of the uncharged portion of the polymer, in other words, that polymers containing higher levels of HEMA were stronger bases than polymers containing higher levels of MMA. This effect was rationalized by assuming that higher contents of the more polar HEMA monomer facilitated the coil expansion that accompanied the process of ionization, thus increasing charge separations at corresponding values of alpha and increasing base strength.     

Removal of acidic dye from aqueous solutions using poly(DMAEMA–AMPS–HEMA) terpolymer/MMT nanocomposite hydrogels

In this study, poly(DMAEMA–AMPS–HEMA) terpolymer/montmorillonite nanocomposite hydrogels were prepared by in situ polymerization technique using 2-(N,N-dimethylamino)ethyl methacrylate (DMAEMA), 2-acrylamido-2-methlypropane sulfonic acid (AMPS), 2-hydroxyethyl methacrylate (HEMA) monomers in clay suspension media. N,N-methylenebisacrylamide (NMBA) was used as crosslinker and potassium persulfate/potassium bisulfide were used as initiator and accelerator pair. The water absorption capacities and acidic dye (indigo carmine) adsorption properties of the nanocomposite hydrogels were investigated. Adsorption properties of the hydrogels were investigated at different conditions such as different initial dye concentration and contact time. The concentrations of the dyes were determined using UV/Vis Spectrophotometer at wavelength 610 nm. Langmuir and Freundlich isotherm models were used to describe adsorption data and the results clarified that these models were the best-fit for the adsorption of indigo carmine.     

叔丙乳液的合成及水性防锈漆的研制

以甲基丙烯酸甲酯、丙烯酸丁酯、叔碳酸乙烯酯为主要单体,甲基丙烯酸、甲基丙烯酸缩水甘油酯、甲基丙烯酰氧基丙基三甲氧基硅烷为交联单体合成了叔丙乳液。研究了乳化剂的种类、用量及配比,交联单体的用量对乳液及涂膜性能的影响。确定复合乳化剂（RE-610/LCN407）的最佳用量为单体总量的2%,RE-610/LCN407的最佳质量比为1∶2。试验发现：当甲基丙烯酸缩水甘油酯与极性单体甲基丙烯酸的官能团比例为1∶1时,二者进行交联,可提高叔丙乳液的交联度。通过加入铁红、三聚磷酸铝、滑石粉、硫酸钡等制备的水性防锈漆,对金属底材具有良好的保护性。     

Synthesis and characterization of novel silicone acrylate–soya alkyd resin as binder for long life exterior coatings

A polymeric binder on soya alkyd, silicone intermediate and 2-hydroxyethyl metacrylate has been synthesized for formulation of long life exterior coating. Initially silicone acrylate monomer (SAM) was prepared by reacting hydroxyl-terminated silicone and 2-hydroxyl ethyl methacrylate (HEMA) and characterized by Fourier transformer infrared spectroscopy (FTIR) and carbon nuclear magnetic resonance spectroscopy (¹³C NMR). SAM was used in varying concentrations to synthesize novel soya alkyd resin. The unpigmented polymer film obtained from silicone acrylate–soya alkyd resin exhibits excellent mechanical properties and good exterior durability compared to silicone modified alkyd resin.