通用型船舶防锈底漆的发展及应用

介绍了改性环氧通用底漆的技术水平和发展现状,分析了改性环氧通用底漆的技术特性和应用前景。     

混凝土湿表面固化封闭底漆结合强度的研究

通过对混凝土湿表面底漆固化特点的分析,研究了不同的环氧树脂、溶剂和助剂对潮湿表面的湿态附着力的影响,表明选择合适的树脂和助剂可制备出性能优良的湿固化封闭底漆,适用于海港工程混凝土结构表面的湿固化防腐涂装。     

Using X-ray tomography,PALS and Raman spectroscopy for characterization of inhibitors in epoxy coatings

Model paint materials were generated by adding a range of inorganic materials into an epoxy. The inorganic materials included inhibitors (Zn₃(PO₄)₂ and SrCrO₄) and a filler (rutile TiO₂).The SrCrO₄ system was characterized using SEM, TEM, PALS and Raman spectroscopy and found to have an even distribution of inhibitor in the polymer matrix. X-ray tomography was performed on the mixed SrCrO₄/TiO₂ and Zn₃(PO₄)₂/TiO₂ systems. A new technique called data constrained modelling was combined with the tomographic technique to produce a 3D distribution of the inorganic phases within the polymer matrix.     

SECM study of steel corrosion under scratched microencapsulated epoxy resin

Scratch tests were performed on epoxy coated steel samples with and without microcapsulated linseed oil, known to develop a polymerized protective layer after having been released from the capsules at the damaged sites. The scanning electrochemical microscope has been applied to monitor the protection efficiency of this self-healing coating in aqueous acidic solution. In the proximity of the local damage, both the anodic metal dissolution and the cathodic oxygen reduction showed that the coating with microcapsules substantially and spontaneously decreased the rate of corrosion proving the self-repair concept of the coating. Electrochemical impedance measurements underline the protective effect of the coating as well.     

高性能底漆(腻子)在高铁聚脲防水层中的应用研究

介绍了聚氨酯底漆(腻子)和环氧底漆(腻子)的合成方法,并比较了两种底漆(腻子)在高铁聚脲防水层中应用的优缺点,分析了不同施工条件、施工方法和施工工序对涂层与基层粘结强度的影响,得出底漆(腻子)的内应力和强度是影响涂层与基层附着力的主要因素。     

Effect of self-etching ceramic primer on bond strength of zirconia-reinforced lithium silicate ceramics

Abstract

This study evaluated the effect of self-etching ceramic primer (SECP) on shear bond strength (SBS) of zirconia-reinforced lithium silicate (ZLS) ceramics. Two hundred and seventy block-specimens of two types of ZLS ceramics and one type of lithium disilicate (LS) ceramics were prepared. Ninety blocks of each material were divided into three groups (n?=?30), namely group 1: no surface treatment (control), group 2: hydrofluoric acid (HF), silane-based primer (S), and group 3: SECP. Resin cement was applied, and light-cured for build-up. Shear bond strength (SBS) test was used. Half of the bonded specimens (n?=?15) were tested after storage in distilled water for 24?h, whereas the other half were tested after 5000 thermo-cycles. The failure modes were evaluated using scanning electron microscope (SEM). The SBS values for samples treated with SECP and HF?+?S within the respective materials were statistically comparable (p?>?0.05). Thermocycling significantly reduced the SBS (p?<?0.05) for all ceramic materials in groups 2 and 3. Mixed failure followed by adhesive failure were the most common failure modes in groups 2 and 3, whereas pretest failure was only detected in group 1. Considering the limitations of the study, with respect to in vitro bond strength, the SECP is an alternative for the conditioning of internal surface of glass ceramics.     

PCR-based identification of pathogenic Candida species using primer mixes specific to Candida DNA topoisomerase II genes

For rapid identification of Candida to the species level, degenerated primers and specific primers based on the genomic sequences of DNA topoisomerase II of C. albicans, C. dubliniensis, C. tropicalis (genotypes I and II), C. parapsilosis (genotypes I and II), C. krusei, C. kefyr, C. guilliermondii, C. glabrata, C. lusitaniae and Y. lipolytica were designed and their specificities tested in PCR-based identifications. Each of the specific primers selectively and exclusively amplified its own DNA fragment, not only from the corresponding genomic DNA of the Candida sp. but also from DNA mixtures containing other DNAs from several fungal species. For a simpler PCR-based identification, the specific primers were divided into three groups (PsI, PsII and PsIII), each of which contained four specific primer pairs. PCR with the primer mixes yielded four different sizes of PCR product, corresponding to each Candida sp. in the sample DNA. To obtain higher sensitivity of PCR amplification, sample DNAs were preamplified by the degenerated primer pair (CDF28/CDR148), followed by the main amplification using the primer mixes. By including this nested PCR step, 40 fg yeast genomic DNA was detected in the sample. Furthermore, we applied this nested PCR to a clinical diagnosis, using splenic tissues from experimentally infected mice and several clinical materials from patients. In all cases, the nested PCR amplifications detected proper DNA fragments of Candida spp., which were also identified by the standard identification tests. These results suggest that nested PCR, using primer mixes of the Candida DNA topoisomerase II genes, is simple and feasible for the rapid detection/identification of Candida to species level in clinical materials.     

Development of a Polymerase Chain Reaction System for the Detection of Dog and Cat Meat in Meat Mixtures and Animal Feed

The identification of species origin of meat represents a considerable problem for food and animal feed analysis. In the present study a PCR‐mediated method for the detection of dog and cat meat was developed. For this the cytochrome b gene sequence of both species was analyzed by restriction fragment length polymorphism (RFLP) analysis. The use of the restriction enzymes Alu I and Hae III yielded specific restriction profiles characteristic for each species. The meat of both species could additionally be differentiated with species‐specific oligonucleotide primers based on specific parts of the cytochrome b gene sequences characteristic for dog and cat. The use of these oligonucleotide primers allowed a direct identification of dog and cat meat in meat mixtures even after heat treatment.     

2010世博会主题馆钢结构主防腐涂层系统分析

对2010上海世博会主题馆钢结构主防腐涂层系统的水性无机富锌底漆、环氧云铁中间漆、脂肪族聚氨酯面漆进行了分析,提出了涂层配套方案,并结合实例提出了钢结构防腐涂料的发展方向。     

过氯乙烯底漆磨浆法生产工艺的研究

介绍了在过氯乙烯树脂液中加入适量醛酮树脂液和二甲苯甲醛树脂,采用磨浆法生产过氯乙烯底漆的生产工艺。