Enhanced corrosion resistance of epoxy resin coating via addition of CeO_(2) and benzotriazole

The use of fillers to enhance the corrosion protection of epoxy resins has been widely applied.In this work,cerium dioxide(CeO_(2))and benzotriazole(BTA)were introduced into an epoxy resin to enhance the corrosion resistance of Q235 carbon steel.Scanning electron microscopy results indicated that the CeO_(2) grains were rod-like and ellipsoidal in shape,and the distribution pattern of BTA was analyzed by energy dispersive spectroscope.The dynamic potential polarization curve proved the excellent corrosion resistance of the composite epoxy resin with CeO_(2) and BTA co-addition,and electrochemical impedance spectroscopy test analysis indicated the significantly enhanced long-term corrosion protection performance of the composite coating.And the optimal protective performance was provided by the coating containing 0.3%(mass)CeO_(2) and 20%(mass)BTA,which was attributed to the barrier performance of CeO_(2) particles and the chemical barrier effect of BTA.The formation of corrosion products was analyzed using X-ray diffraction.In addition,the corrosion resistance mechanism of the coating was also discussed in detail.

Study on the Rapid Method to Predict Longevity of Controlled Release Fertilizer Coated by Water Soluble Resin

The study discussed the rapid method to test and predict the longevity of controlled release fertilizers （CRFs） coated by water soluble resin by using the short-term leaching under higher temperature. Pure water dissolving incubation and higher temperature leaching were used to study the patterns of the nutrient release of the CRFs. The correlation analysis between the days at 25℃ and the hours at 80℃ of Trincote 1 and Trincote 2 for the same cumulative release rates were conducted. Patterns of cumulative nutrient release curve followed one factor quadratic regression equation at each given temperatures, and each of relative coefficient was bigger than 0.995. As the temperature increased, nutrients release of the CRFs increased. The longevity of resin coated CRFs were predicted by use of both the cumulative nutrients release equation at 80℃ and the regression equation of release time needed for the same cumulative release rates between 25 and 80℃. There were only 0.3-6.9% relative errors between the tested longevity and predicted one. In conclusion, the longevity of resin coated CRFs could be predicted more quickly and precisely by use of the higher temperature short-term leaching method than that of the traditional differential release rate. The longevity of resin coated CRF could be rapidly and precisely predicted in a few hours by application of the higher temperature shortterm leaching method.

Influence of resin flow on shrinkage of additive manufacturing coated sand molds

Coated sands are used extensively for additive manufacturing sand molds in the metal casting process, and the packing structure changes caused by the resin flow promote the shrinkage and deformation of the part. During the coated sand heating, the resin on the surface flowing to the contact points of the particles forms the resin neck and causes particles to pack close to each other. In this work, the diameters of the coated ceramsite sand before and after heating were measured based on in-situ experimental observations with image measuring apparatus and blue laser, to obtain the relationship between resin coating thickness and the particle diameter. The particle packing model was established to describe the particles＇ achievement of a stable state one by one. A re-packing simulation was then performed after reducing the particle diameter according to the resin coating thickness, to obtain the shrinkage ratios at different particle size distributions. It was found that the resin coating thickness increased from 0.8 to 2.3 IJm as the particle diameter increased from 107 to 500 IJm, for the coated ceramsite sand with the resin content of 2wt.%; the shrinkage ratio decreased first and then increased as the particle diameter increased. The experimental minimum shrinkage ratio was 3.28%, and the corresponding particle diameter was 300-375 IJm, while the minimum shrinkage ratio obtained by simulation was 3.43%, and the corresponding particle diameter was 214-300 IJm. After mixing the five groups proportionally, the shrinkage ratios of the simulation and experiment dropped to 2.81% and 3.04%, respectively, indicating the best results.

Protective Performance of Fiberglass Fabrics Coated by Silicone Resin Mixed with Nature Filler Powders

The coated fiberglass fabric was prepared to protect personnel and equipment from sparks, heat, and molten metals during hot work projects. Ferric oxide powder 2%,mica powder6%,wollastonite powder 4%,and white carbon black 8% were added in the phenyl methyl silicone to prepare the composite silicone solution. The french chalk and coupling agent can effectively solve the deposition of fillers in the coating solution. Compared with the original fiberglass fabric,heat resistance of the coated fabric under high temperature was greatly improved, and the temperature limitation in short period was higher than 900℃. Horizontal flammability tests showed that the coated fabric was non-combustible with no melting and no fragments. The temperature for long period usage of coated fabric was lower than 500 ℃. Welding drop test showed that the coating could prevent the molten metals,sparks and heat from transferring in the fabric. Test for toxic gas release showed that the toxic gases such as HCN,SO_2,HCl,and HF were not detected,only CO( 100 mg / m^3) and NO( 12 mg /m^3) were detected,and their concentrations were far lower than the limitation values CO( 4 375 mg / m^3) and NO( 134 mg /m^3). The breaking strength of coated fabric was almost twice the strength of the original fabric,and the coated surface had good water and oil repellency.

改性胶粘剂在RCS混合节点的应用及固化强度研究

使用纳米化学改性方案,通过优化树脂节点的化学官能团,增加交联化学键密度,实现改性胶粘剂的优化,含早期强度优化和长期强度优化。使用实体地震应力液压试验台,采用实测数据的方法进行方案比较。对比数据含48 h内每隔6 h的强度测量、48 h、15 d和30 d的强度测量,不同地震强度条件下上述时间点的强度测量。实测数据表明,纳米化学改性树脂胶粘剂的早期强度和长期强度均优于传统的环氧树脂锚固粘接方案,且在高强度地震条件下有优化表达。不牺牲长期强度的前提下,纳米化学改性树脂胶粘剂的早期强度粘接可靠性优于传统环氧树脂表现。

Toray develops hybrid bonding insulating resin and revolutionary polymer membrane

This year,Toray Industries,Inc.,announced that it has developed an insulating resin material for hybrid bonding(micro bonding).The material is based on Semicofine™and Photoneece™.These are high-heat-resistant polyimide coatings for semiconductor and display devices.The new material combines a conventional polyimide coating agent with the company’s processing and bonding technologies.It can enhance the yields and reliability of semiconductor devices in the hybrid bonding process,which entails bonding semiconductor chips with metal electrodes.Toray will push ahead with prototyping and providing samples to customers.It aims to obtain materials certification in 2025 and start mass production by 2028.

Effect of Self-adhesive Resin Cement and Tribochemical Treatment on Bond Strength to Zirconia

Aim To evaluate the interactive effects of different self- adhesive resin cements and tribochemical treatment on bond strength to zirconia. Methodology The following self-adhesive resin cements for bonding two zirconia blocks were evaluated： Maxcem （MA）, Smartcem （SM）, Rely X Unicem Aplicap （UN）, Breeze （BR）, Biscem （BI）, Set （SE）, and Clearfil SA luting （CL）. The specimens were grouped according to conditioning as follows： Group 1, polishing with 600 grit polishing paper; Group 2, silica coating with 110 μm Al2O3 particles which modified with silica; and, Group 3, tribochemical treatment - silica coating ＋ silanization. Specimens were stored in distilled water at 37℃ for 24 hours before testing shear bond strength. Results Silica coating and tribochemical treatment significantly increased the bond strength of the MA, UN, BR, B1, SE and CL to zirconia compared to #600 polishing. For both #600 polished and silica coating treatments, MDP- containing self-adhesive resin cement CL had the highest bond strengths to zirconia. Conclusion Applying silica coating and tribochemical treatment improved the bond strength of self-adhesive resin cement to zirconia, especially for CL.

Development of Siliconized Epoxy Resins and Their Application as Anticorrosive Coatings

The present work involves the development of siliconized epoxy resin to overcome the drawback of epoxy resin like poor impact strength, high rigidity and moisture absorbing nature because of which they are not applied as corrosion resistant coating. By embedding silicone into the back bone of polymeric resin the above drawback can be reduced to substantial level. For achieving this, siliconised epoxy resins were prepared by reacting amine terminated silicone resin with novolac epoxy resin and meta-phenylenediamine was used as curing agent. The applied films of coating were baked at 150oC. Cured films were evaluated for their thermal, mechanical, chemical and corrosion resistance properties to ascertain the commercial utility of these eco-friendly resin for use in anti corrosive formulations. The siliconized epoxy resins system was found to exhibit good thermal and anticorrosive properties.

Developing polydopamine modified molybdenum disulfide/epoxy resin powder coatings with enhanced anticorrosion performance and wear resistance on magnesium lithium alloys

Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive application.There are limited approaches to exploit such anti-corrosion and mechanical properties of magnesium lithium alloys.Herein,the epoxy resin powder coating with polydopamine modified molybdenum disulfide(MoS_(2)@PDA-EP powder coating with 0,0.1,0.2,0.5,1.0 wt.%loading)was well prepared by melt extrusion to investigate its anticorrosion performance and wear resistance.The results revealed that the addition of MoS_(2)@PDA enhanced the adhesion strength between coatings and alloys,wear resistance and corrosion protection of the powder coatings.Among them,the optimum was obtained by 0.2 wt.%MoS_(2)@PDA-EP powder coating which could be attributed to well dispersion and efficient adhesion with coating matrix.To conclude,MoS_(2)@PDA-EP powder coating is meaningfully beneficial for the anticorrosive and wear performance improvement of magnesium lithium alloys.

Preparation of Silica Powder in Epoxy Resin Wear-Resistant Coating

Silicon powders possess good thermal stability and rub resistance and can be used as the filler of high temperature wear-resistant coating;it can possess good wettability and dispersibility in the organic polymer by surface modification of silane coupling agent. Organic silicon has good thermal stability, which can modify the frangibility and thermal stability of epoxy resin. A certain proportion of modified silica powder, curing agent and additives were dispersed to modified epoxy resin can compound wear-resistant coating. The results show that: the modification effect can be the best if the dosage of silane coupling agent is 1.5% of silicon powder. If the methyl triethoxy silane is 50 phr and modified silica powder is 200 phr, then various performances of coating tend to be the best.

The Durability of Epoxy Resin Coating

The durability of epoxy resin coating was studied under environments with relative humidity （RH） of 98%-100%, at 55 ℃ for 900 h, at 65 ℃ for 700 h and at 75 ℃ for 400 h, respectively. Peel strength test, dynamical mechanical thermal analysis （DMTA）, infrared spectroscopy （IR） and energy dispersive X-ray spectroscopy （EDX） were employed for measurements. Peel strength indicated the development of adhesive property of the coating, DMTA indicated the development of physical property, IR revealed the development of chemical structure, and EDX showed surface element change of the coating. All these results show a good time- temperature equivalence characteristic between humidity aging time and temperature.

有机玻璃表面硅树脂耐磨涂层的制备与表征

以纳米SiO_(2)溶胶、甲基三乙氧基硅烷(MTES)和γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH-560)为原料,采用溶胶-凝胶法制备了一系列环氧烃基硅树脂;添加1-苄基-2-甲基咪唑(BMI)、乙酰丙酮铝、混合溶剂等,配成用于改善聚甲基丙烯酸甲酯(PMMA)表面抗划伤性的有机硅涂料。研究了SiO_(2)溶胶与KH-560的配比、乙酰丙酮铝的用量等参数对涂层耐磨性、硬度、附着力及光学透光性等性能的影响。结果表明,制备的硅树脂涂层可以有效提高PMMA表面的硬度和耐磨性,当涂层原料SiO_(2)和KH-560的质量比为2∶1、乙酰丙酮铝用量为涂层液质量的0.4%时,涂层的铅笔硬度和附着力分别为4H和1级,耐磨性和透光性均较未涂覆的PMMA基材有所提高。

水利工程用环氧树脂改性聚氨酯丙烯酸酯性能研究

水利工程金属结构和水工建筑物常遭受腐蚀、高速含沙水流磨蚀破坏,需对其进行便捷有效的防护。利用环氧树脂对聚氨酯丙烯酸酯(PUA)进行改性提高PUA与基体黏结性能,采用紫外光(UV)固化技术制备PUA涂层。研究了环氧树脂改性PUA的化学结构及环氧树脂用量对PUA的力学性能、热稳定性能、耐溶剂性能和抗冲磨性能的影响。结果表明,环氧树脂改性PUA的拉伸强度随着环氧树脂用量增加,呈下降趋势,当加入5%时,PUA拉伸强度为103.0 MPa,材料呈强而脆的特性。环氧树脂加入提升了PUA的拉伸剪切强度,由0.25 MPa增至1.60 MPa。同时,环氧树脂改性PUA具有良好的耐水性能、耐溶剂性能、抗冲磨性能,5%环氧树脂改性PUA抗冲磨强度为800 h/(kg·m^(2))。

丙烯酸硅烷酯柔性自抛光防污涂料制备及性能

以甲基丙烯酸甲酯、丙烯酸丁酯、丙烯酸异辛酯、丙烯酸甲氧基乙酯、丙烯酸三异丙基硅酯为单体,制备了丙烯酸硅烷酯基体树脂,将其与韧性树脂(液态聚丁二烯)共同作为成膜共混树脂,并以Cu_(2)O作为主要防污剂组分、吡啶硫酮铜(CuPT)和代森锌(Zineb)为辅助有机防污剂组分,配制了柔性自抛光防污涂料。对丙烯酸硅烷酯基体树脂进行了FTIR表征和玻璃化转变温度(Tg)测定,对成膜共混树脂进行了SEM测试,对柔性自抛光防污涂料进行了柔韧性、附着力、吸水率和防污性能测试。结果表明,丙烯酸硅烷酯基体树脂的Tg=–20.54℃时,具有较好的物理机械性能;韧性树脂可以作为外增塑手段增加丙烯酸硅烷酯基体树脂的柔韧性,当m(丙烯酸硅烷酯基体树脂)∶m(韧性树脂)=7∶3时,成膜共混树脂的相容性最好;柔性自抛光防污涂料柔韧性为1级,在弹性体基材表面附着力达到4.0 MPa;经过60 d测试,吸水率为1.1%~1.2%;浅海浸泡挂板36个月显示出明显的防污效果。

聚氨酯和环氧树脂涂层耐水性能对比研究

本文选择了不同类型的聚氨酯(PU)涂层和环氧树脂(EP)涂层作为代表,通过红外光谱、固态核磁共振、热失重分析和热力学性能分析,研究了长期水下浸泡对涂层结构和性能的影响,并进一步对比了上述不同材料的水解稳定性。结果表明,聚醚型聚氨酯(PTMG-PU)涂层具有最优的耐水性,并且其化学结构基本没发生化学水解作用,然而加入陶瓷增强颗粒会降低材料的耐水性,并可能加速水解作用对涂层结构和性能的影响;相同水解条件下,聚酯型聚氨酯(PEA-PU)和EP涂层在水中的耐水性较差,并且可能发生聚合物链的化学水解作用,进而导致材料储能模量的提高。

CeO_(2)-ZrO_(2)-Al_(2)O_(3)/丙烯酸防腐涂料的制备及性能研究

为探究填充不同质量的无机填料CeO_(2)-ZrO_(2)-Al_(2)O_(3)(CZA)粉体对丙烯酸涂料防腐性能及各项力学性能的影响,采用共沉淀法经过干燥煅烧合成了CZA粉体样品,将得到的CZA粉末配以市场上常用的分散剂、消泡剂等助剂在丙烯酸树脂中充分分散,并以刮涂的处理方法在经过处理的铁板上制备不同质量分数的丙烯酸防腐涂层。采用XRD、SEM和EDS对CZA粉体样品进行物相分析,利用力学性能测试和电化学防腐性能测试对涂层附着力、硬度、粗糙度、弯折性能、耐磨性、拉伸强度、断裂伸长率、防腐性能等特性进行评估。结果表明,制备得到的CZA粉体为固溶体,呈现四面体结构,添加CZA粉末后,涂层硬度提高,由HB上升至1H,弯曲性能皆为1T,耐磨性能得到提高,附着力皆为1级。与没有添加CZA的丙烯酸防腐涂层相比,CZA增强了涂层的防腐性能,当填料添加质量分数为10%时,涂层防腐性能最佳。该丙烯酸类防腐涂料具有一定的防腐性能,能够有效防止腐蚀介质对材料的腐蚀,未来在防腐领域具有一定的应用前景。

有压热闷渣微粉对环氧涂料的性能影响

以有压热闷渣为研究对象,采用超细立式粉磨机处理有压热闷渣形成微粉,利用有压热闷渣微粉替代传统防腐填料与环氧树脂、二甲苯、正丁醇及聚酰胺形成有压热闷渣/环氧复合防腐涂料.根据《色漆和清漆摆杆阻尼试验》(GB/T 1730—2007)、《漆膜划圈试验》(GB/T 1720—2020)、《色漆和清漆耐磨性的测定旋转橡胶砂轮法》(GB/T 1768—2006)、《漆膜、腻子膜柔韧性测定法》(GB/T 1731—2020)测定涂层的硬度、附着力、耐磨性、柔韧性,《色漆和清漆耐中性盐雾性能》(GB/T 1771—2007)与《漆膜吸水率测定法》(HG/T 3344—2012)测定涂层的耐盐雾性能及吸水率.采用接触角测量仪、精密阻抗测试仪和电化学工作站测定涂层的接触角、阻抗模量和腐蚀电位.采用扫描电子显微镜、X射线荧光光谱仪、X射线衍射仪和激光粒度分析仪测试微观形貌、化学成分、矿物组成和粒度分布.研究有压热闷渣微粉对环氧复合防腐涂料涂层力学性能、防腐性能的影响,及其作用机理.结果表明有压热闷渣的主要矿物成分C_(3)S、C_(2)S、Ca(OH)_(2)、C_(2)F、RO相和f-CaO等,其具有硅酸盐特性可以提高耐久性.利用超细立式粉磨机对有压热闷渣进行加工,有利于f-CaO矿化,减小颗粒粒径、增大比表面积.当有压热闷渣微粉的粒径均匀度为2.240,其添加量为5%时有压热闷渣/环氧复合防腐涂料涂层的性能最佳,即摆杆硬度测试结果为115.75 s、附着力为3级、磨损量最小、柔韧性为4 mm、阻抗模量为10^(6.1)Ω·cm^(2)、腐蚀电位E为0.143 V.有压热闷渣微粉作为一种刚性粒子,将其加入环氧涂料体系中,一方面可以改善涂层的硬度、耐摩擦、力学等性能,另一方面合理的粒径均匀度可以增强涂层的密实度,提升防腐性能.开启有压热闷渣在非建材领域高值化利用的新途径,实现钢铁行业“以废增效”、涂料行业“以废降本”的目的.

丙烯酸-环氧树脂涂层对海工混凝土防腐性能的影响

合成了一种丙烯酸-环氧树脂涂层,研究了海水浸泡条件下涂覆丙烯酸-环氧涂层混凝土的力学性能、耐久性能,并对其水化产物及微观结构进行了分析。结果表明:在海水浸泡条件下,相较于无涂层对照组,涂覆丙烯酸-环氧树脂涂层的混凝土抗压、劈裂抗拉强度均相对较高,表面pH值减小幅度较小,抗氯离子渗透性能较好,可以保持混凝土内部的高碱性,水化产物中水化硅酸钙含量相对较高,基体结构致密,孔隙和微裂纹较少。涂覆丙烯酸-环氧树脂涂层可使海工混凝土具有优异的力学性能和耐久性能。

水性无机耐高温防腐涂料的研制

以硅烷KH560、甲基三甲氧基硅烷偶联剂、气相二氧化硅和氢氧化钾为主要原料合成水性无机耐高温树脂,为提高涂料的耐热性,选择铜铬黑、磷酸锌、碳酸镁作为主要颜填料,并选用抗开裂粉料、消泡剂、分散剂等提高涂层外观及涂料的施工性能等。结果表明,该涂料有机挥发物低于100mg/L,涂层能在200℃固化成膜,700℃煅烧2h仍具有良好的防腐性能,且附着力好、耐盐雾性能良好。

凝胶涂层包覆大孔树脂固定化脂肪酶的制备及在风味酯合成中的应用

风味酯是一种重要的香料化合物,在食品、化妆品和制药等行业具有重大的应用价值。酶法合成风味酯具有反应条件温和、选择性高以及污染少等优点,但在有机溶剂中,游离脂肪酶的活性会有极大的损失。为了提高脂肪酶的稳定性,该研究首先使用大孔树脂通过吸附作用固定化脂肪酶,然后对酶蛋白表面进行丙烯酰化修饰和聚合反应,在固定化脂肪酶的表面形成凝胶涂层的包覆。此种方式制备的固定化脂肪酶稳定性有了较大提高。利用该固定化酶分别通过酯化反应合成乙酸丁酯和转酯反应合成乙酸异戊酯,结果显示,以正庚烷为溶剂,乙酸和丁醇浓度均为0.1 mol/L,并添加1 g固定化酶,在45℃经过12 h的反应,乙酸丁酯的合成率达到93.05%,重复利用4次后仍然有70.83%的酯合成率;在3 mL乙酸乙烯酯溶液中加入0.8 mol/L异戊醇和0.5 g固定化酶,在45℃经过14 h的反应,乙酸异戊酯的合成率达到92.35%,重复利用4次后仍然有84.80%的酯合成率,研究建立了一种固定化脂肪酶的新方法,并为风味酯的制备奠定了基础。。