室温离子交联苯丙乳液合成及性能研究

以苯乙烯(St)、丙烯酸丁酯(BA)和丙烯酸(AA)为单体,过硫酸钾(KPS)为引发剂,采用乳液聚合方法通过离子交联合成了室温交联型苯丙乳液。考查了聚合温度、引发剂用量、乳化剂用量对聚合稳定性和乳液性能的影响,同时研究了Zn~(2+)/AA配比和软硬单体配比对胶膜性能的影响。结果显示,在80℃、KPS用量为0.4%、乳化剂用量为2.0%~3.5%时,乳液具有较好聚合稳定性以及粒径单分散性;随配比中醋酸锌用量增加,胶膜的干燥时间缩短,吸水性减小,而拉伸强度有适当提高;随体系中硬单体含量增加,胶膜的干燥时间增加,而硬度和拉伸强度则逐渐提高,吸水性变小。     

TMPTA交联改性水性丙烯酸树脂的制备及性能

以丙烯酸丁酯和甲基丙烯酸甲酯为主要单体,甲基丙烯酸缩水甘油酯和丙烯酸为功能性单体,三羟甲基丙烷三丙烯酸酯(TMPTA)为交联剂,采用乳液聚合法合成了水性丙烯酸树脂。通过测量乳液粒径和黏度,热重分析,机械性能和吸水率测试,考察了TMPTA用量对乳液及其胶膜性能的影响,并用红外光谱表征了胶膜的结构。结果表明,TMPTA的加入可提高胶膜的拉伸强度、硬度、热稳定性和耐水性。当TMPTA用量为6%时,乳液的平均粒径为78.49 nm,黏度为29.77 mPa·s。其胶膜的综合性能最好:交联度96.63%,邵氏硬度44 HA,T剥离强度0.46 kN/m,拉伸强度2.30 MPa,断裂伸长率154.2%,吸水率3.60%,失重率为50%时的分解温度为411℃。     

UV固化光纤带涂料的研制

用环氧丙烯酸酯与聚氨酯丙烯酸酯共混聚合的方法制备出性能优良的UV固化光纤带涂料。讨论了齐聚物种类,齐聚物共混配比,不同官能度单体配比,齐聚物与单体的配比以及光引发剂及其含量对UV固化光纤带涂料的性能如剥离性、拉伸强度、延伸率和柔韧性的影响。     

新型光固化聚氨酯甲基丙烯酸酯的合成与表征

合成了适于粘接水晶饰品的新型聚氨酯甲基丙烯酸酯预聚体(PUMA),通过FT-IR和GPC对其结构进行了表征.探讨了光引发剂、活性单体等因素对其感光性能的影响.研究表明,含磷酰基的TPO光引发体系引发速率最快,感度值可达8.75 mJ/cm2,光引发剂用量在4%～6%比较适宜.单体的官能度和结构对体系的光固化速率有很大影响,多官能、分子链柔性好的单体有利于加快反应速率,TPGDA与PUMA组成的感光体系的固化速率较快,固化膜的柔韧性较好.     

单体含量对核壳结构聚氨酯-聚丙烯酸酯乳液性能影响

以水性聚氨酯（PU）为种子乳液,以丙烯酸酯（PA）为聚合性单体,采用种子乳液聚合法合成核壳结构聚氨酯-聚丙烯酸酯乳液（PUA）。研究了单体含量对乳液及胶膜性能的影响。实验结果表明：随着乙烯基单体含量的增加,乳液颜色加深,稳定性下降,胶膜的断裂伸长率降低,硬度和耐水性增加。当乙烯基单体和PU百分比（M／P）为25％时,乳液的稳定性大于12个月,胶膜的断裂伸长率为498％,硬度为0．64,吸水性为22．8％。红外光谱分析表明合成了PUA。     

磺酸型扩链剂用量对WPU胶膜性能影响的研究

以聚四氢呋喃二醇(PTMG1000)、异佛尔酮二异氰酸酯(IPDI)和自制液态磺酸型扩链剂1,2-二羟基-3-丙磺酸(DHPS)为原料合成预聚体,以四甲基氢氧化铵(TMAH)为成盐剂,改变DHPS用量制备了一系列水性聚氨酯乳液,利用动态力学分析(DMA)、热重分析(TGA)、拉伸等测试方法对聚氨酯胶膜性能进行了研究。结果表明,随着DHPS用量的增加,聚氨酯胶膜的拉伸强度增大,断裂伸长率降低。当磺酸基质量分数为4%时,聚氨酯胶膜的拉伸强度为40.4 MPa、断裂伸长率为1006%。随着磺酸基含量的增加,聚氨酯胶膜的硬度增加,耐水性降低,耐溶剂性增加。     

油墨与相关技术

提高了固化速度的UV固化喷印油墨组合物 一种喷印油墨组合物含至少一种单官能（甲基）丙烯酸酯单体、至少一种单官能肛乙烯酰胺单体、至少一种自由基光引发剂和至少一种着色剂。该油墨25℃黏度〈100mPa·S,含≤15％多官能单体。     

自由基聚合引发剂研究进展

自由基聚合是大规模生产各种烯类聚合物的有效方法，在工业生产中，约70％以上的烯类聚合物都是通过自由基聚合来实现的。自由基聚合引发体系可归纳为过氧化物类引发剂、偶氮引发剂、二硫化物引发剂、氧化还原引发体系、双官能度及多官能度引发剂和大分子引发剂等。本文着重介绍近年来新发展起来的水溶性偶氰引发剂、双官能度及多官能度引发剂、大分子引发剂以及氧化还原引发剂的最新进展。     

乳液聚合交联改性提高疏水性氟代丙烯酸酯的力学性能

为了改善丙烯酸酯的力学性能,以丙烯酸酯为主要单体,甲基丙烯酸十二氟庚酯为功能单体,1,4-丁二醇二丙烯酸酯(BDDA)为交联剂,采用核壳乳液聚合法合成了水性含氟丙烯酸酯。考察了反应条件,并对乳液的稳定性、粒径,以及乳液膜的拉伸强度、断裂伸长率、硬度、水接触角和化学结构进行了表征。结果表明,BDDA的加入可以有效提高乳液膜的拉伸强度、断裂伸长率及硬度。当BDDA占单体质量3%时,乳液的平均粒径为63.8 nm,转化率为99.2%,乳液膜的综合性能最好,分别为:吸水率4.9%,水接触角98.8°,拉伸强度1.94 MPa,断裂伸长率743.6%,硬度45.6 HA。其拉伸强度和断裂伸长率分别是未改性含氟丙烯酸酯乳液膜的1.73倍和1.46倍。     

硅烷偶联剂KH-602改性水性聚氨酯的研究

以聚醚(N-210)、异佛尔酮二异氰酸酯(IPDI)为基本单体,以硅烷偶联剂3-(2-氨乙基)氨丙基甲基二甲氧基硅烷(KH-602)作为后扩链剂,通过在后扩链工艺中加入不同比例的KH-602,合成了一系列改性的固含量在28%~40%的水性聚氨酯乳液。用红外光谱对产物结构进行了表征,考察了KH-602加入量对乳液稳定性、胶膜耐水性、力学性能及热性能的影响,同时对乳液进行了接触角的测试。研究表明在一定范围内,随着KH-602加入量的增加,胶膜的拉伸强度增加,断裂伸长率下降,耐热性提高,接触角增大。     

Study on properties of a novel photosensitive polysiloxane urethane acrylate for solder mask

The photosensitive and physical and mechanical properties of a novel polysiloxane urethane acrylate (PSUA) for solder mask were investigated using real‐time FTIR, DMTA and TGA. It is noted that PSUA showed a notable photosensitivity and a good compatibility with the acrylic monomers and resins. PSUA cured film exhibited excellent thermal property, tensile strength and toughness, and chemical resistance. The decomposition temperature of PSUA was 402 °C. Thermal weight losses of pure PSUA cured film at 300 °C were only 5%. Elongation percentage of PSUA cured film was up to 59%. PSUA resin can be used for solder mask materials for printed circuit. Technology performances of photosensitive imaging flexible solder mask containing PSUA answers operating requirements of the solder masker for printing circuit board. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

光固化低黏度环氧丙烯酸酯的合成与性能研究

合成了可紫外光固化的低黏度环氧丙烯酸酯树脂,通过红外光谱、核磁共振氢谱、碳谱对树脂结构进行了表征;采用综合热分析仪(DSC-TG)对树脂固化膜的耐热性能进行了分析。结果表明,在树脂中添加活性单体时,随单体官能度的增加,固化膜的耐热性能增加,但双官能团单体的用量对固化膜的耐热性能没有明显影响。固化膜具有较好的耐热性,初始分解温度为330.7℃,玻璃化转变温度为76.9℃。所得树脂黏度仅为3~4Pa.s(60℃),为市售产品的1/3,附着力1级,硬度4 H,耐水性能优异,无需添加单体使用。     

Preparation and performance on polycarbonate of B/F/Si‐containing hybrid coatings

A series of UV‐curable B/F/Si‐containing hybrid coatings was prepared by the anhydrous sol‐gel technique. The chemical structure of the coatings was characterized by FTIR, RTIR, and ¹HNMR techniques. The UV‐curable coatings were applied to polycarbonate substrates. The physical and mechanical properties of the UV‐cured coatings, such as pendulum hardness, pencil hardness, contact angle, gel content, MEK rubbing test values, tensile strength, abrasion resistance, and gloss, were examined. Thermal gravimetric analysis (TGA) was done. The relative flammability of the hybrid coatings was tested by the limiting oxygen index (LOI) method. Results of all analyses conducted on the free films and coatings are discussed. J. VINYL ADDIT. TECHNOL., 19:39–46, 2013. © 2013 Society of Plastics Engineers     

Scratch resistant tough nanocomposite epoxy coatings based on hyperbranched polyesters

Advanced multifunctional coatings were prepared by UV curing of epoxy based formulations containing hyperbranched polymers (HBP) and an epoxy functionalized alkoxysilane additive. The addition of HBP to the UV curable epoxy resin induced an important flexibilization of the glassy epoxy network with an increase in toughness of the cured polymeric coatings. Adding the functionalized alkoxysilane into the UV curable formulations, as inorganic precursor of silica phase, an improvement on surface hardness was obtained without strongly affecting the flexibilization and the toughness achieved by the addition of the HBP additive. The increase on surface hardness was accompanied with an increase in scratch resistance and modulus. Advanced scratch resistant and tough nanocomposite epoxy coatings were obtained by properly selecting the components of the formulation.     

Improvement of Leather Surface by UV Curing

Leather surface has been modified with UV-cured film of urethane triacrylate in the presence of variable concentrations of mono-functional monomers such as N-vinyl pyrrolidone (NVP) and ethyl hexyl acrylate (EHA). Incorporation of small amounts of plasticizer into the formulation has substantially enhanced both tensile strength and elongation of the coated leather. Addition of a difunctional monomer such as tripropyl glycol diacrylate (TPGDA) to the system has increased the tensile property further.     

Preparation and Properties of a Reactive Type Nonionic Surfactant Grafted Linear Low Density Polyethylene

Summary A reactive type nonionic surfactant, monostearic acid monomaleic acid glycerol diester (MMGD) was synthesized in our laboratory. Grafting-copolymerization of linear low density polyethylene (LLDPE) with MMGD was carried out by using β ray irradiation in air in a twin-screw extruder. Evidence of the grafting of MMGD as well as its extent was determined by Fourier-transformed infrared (FT-IR) spectroscopy. The effects of monomer concentration, reaction temperature and screw run speed on degree of grafting were studied systematically. The thermal behavior of LLDPE-g-MMGD was investigated by using differential scanning calorimety (DSC). Compared with neat LLDPE, the crystallization temperature (T_c) of LLDPE-g-MMGD increased about 3 °C, and the melting enthalpy (ΔH_m) decreased with increase of MMGD content. It showed that the grafted MMGD monomer onto LLDPE acted as a nucleating agent. The tensile properties and light transmission of blown films were determined. Comparing with neat LLDPE film, no obvious changes could be found for the tensile strength, elongation at break and right angle tearing strength of LLDPE-g-MMGD film. The wettability is expressed by the water contact angle. With an increasing percentage of MMGD, the contact angles of water on film surface of LLDPE-g-MMGD decrease monotonically. Accelerated dripping property of film samples was investigated. The dripping duration of LLDPE-g-MMGD film and commercial antifog dripping film at 60 °C were 52 days and 17 days, respectively.     

Study of the effect of hyperbranched polyols on cationic UV curable coating properties

Cycloaliphatic epoxide‐based cationic UV curable coatings containing three different hyperbranched polyols (HBPs) were systematically formulated and characterized. Polyether polyols were found to deter epoxide conversion under low UV intensity. For high UV intensity, the cycloaliphatic epoxide conversion increased with polyol content. Coatings with HBPs had better flexibility and solvent resistance than those containing a reference triol. Compared to the triol and polyester HBPs, polyether HBPs imparted lower T_g and hardness but a better flexibilizing effect to the coatings. At higher R values, the coating solvent resistance decreased except for those with one polyether HBP. A two‐peak phenomenon was discovered in the residual thermal reaction heat curve after photoDSC experiments. These two peaks were found to be related to the thermal relaxation behavior of the photocured inhomogeneous film, and the reactivation and reaction of the ‘trapped living cationic species’. The capability of the polyol to lower the high‐temperature‐peak temperature corresponded well with the flexibilizing ability. Copyright © 2006 Society of Chemical Industry     

UV固化丙烯海松酸聚氨酯丙烯酸酯的合成及应用

以2,4-甲苯二异氰酸酯(TDI)、丙烯海松酸二甘醇聚酯二元醇和丙烯酸羟丙酯(HPA)为主要原料合成了可紫外光固化的涂料用丙烯海松酸聚氨酯丙烯酸酯(APAPUA)低聚物。对产物进行了红外表征,并考察了其光固化行为。测试了APAPUA固化膜的硬度、柔韧性及其他力学性能,同时考察了其热稳定性。结果表明,该低聚物固化膜铅笔硬度达到4H,附着力1级,耐冲击性55 cm,初始分解温度245℃,具有固化速度快,力学性能及耐热性优良等特点,可以作为价格低廉的耐热性低聚物应用于光固化涂料。     

单体和预聚物对UV光油固化膜层柔韧性的影响

通过一系列实验研究,探讨了单体、预聚物以及相互比例对UV光油固化膜层柔韧性的影响。结果表明:使用双官能团单体制备的UV光油固化膜层的柔韧性最好;单体分子量越大,制备的UV光油固化膜层的柔韧性越好。预聚物对固化膜层的柔韧性影响更大,在实验使用的五种预聚物中,使用2491制备的UV光油固化膜层柔韧性最好。单体和预聚物的不同配比对柔韧性亦有明显的影响,单体和预聚物要有合适的配比才能使制备的UV光油固化膜层的柔韧性最佳。