水下加固用建筑结构胶的研制

研究了市场上几种固化剂(H01、H02等)、增韧剂(685)及重粉料掺量对水下建筑结构胶性能的影响,从而开发出一种水下加固用建筑结构胶产品。研究结果表明:以H01/H02作为复合固化剂,当w(685)=5%、w(重粉料)=50%(均相对于EP总质量而言)时,结构胶的综合性能相对最好,其拉伸强度(34.7 MPa)、断裂伸长率(1.5%)、拉伸弹性模量(3.2 GPa)、弯曲强度(68.2 MPa)、压缩强度(82.9 MPa)、拉伸剪切强度(室温干态22.3 MPa、水下15.4 MPa)和对接粘接强度(35.6 MPa)等均满足GB 50728—2011标准中的指标要求。     

环保型聚氨酯胶粘剂的研制

以聚醚多元醇、环氧树脂、甲苯二异氰酸酯和MOCA为原料制得了双组分环保型聚氨酯胶粘剂。考查了聚醚多元醇与环氧树脂的配比,A与B组分配比及表面处理工艺对拉伸剪切强度的影响。结果表明,当m(聚醚多元醇)︰m(环氧树脂)=100︰11,m(A)︰m(B)=6︰3.5时,拉伸剪切强度较高,达到8.02 MPa;恰当的表面处理工艺对提高拉伸剪切强度是有利的。     

加成型Si/Ti杂化树脂胶粘剂的制备及其性能研究

以乙烯基三乙氧基硅烷、端羟基聚二甲基硅氧烷(107硅油)和钛酸四丁酯(TBT)为原料,采用水解缩合法制备出一种无溶剂型Si/Ti(硅/钛)杂化树脂胶粘剂。研究结果表明:该杂化树脂的拉伸强度、冲击强度随TBT掺量增加而增大;随着原料配比中107硅油掺量的增加,该杂化树脂的拉伸强度下降、冲击强度增大;该杂化树脂胶粘剂的剪切强度随TBT掺量增加、固化时间延长或固化温度升高而增大;玻璃基材表面经硅烷偶联剂(KH-560)处理后,相应胶接件的剪切强度相对最大,并且该剪切强度随KH-560掺量增加而增大。     

商用环氧树脂结构胶在无人机上的应用研究

以Lord 320/322为EP(环氧树脂)基体,采用不同的原料配比制备了EP结构胶,并测定了该结构胶的高低温拉伸剪切强度,进而验证了其在无人机胶接装配中的适用性。研究结果表明:m(Lord320/322)∶m(固化剂)质量比在(1.25~2.00)∶1范围内可调,并且能满足复合材料胶接件在冬季、夏季的使用要求;当m(Lord 320/322)∶m(固化剂)=1.25∶1时,EP结构胶在-50℃、常温和65℃时的拉伸剪切强度优异,其室温固化8 h后的拉伸剪切强度可达到固化24 h后的60%,并且具有快速固化的特点。     

铅酸蓄电池用密封胶的配比对性能的影响

以改性环氧树脂(EP)与改性芳香胺固化剂为原料制备铅酸蓄电池极柱灌封用密封胶,着重研究了改性EP与固化剂的配比对胶粘剂性能的影响。实验结果表明,改性EP与固化剂配比对胶粘剂的初步固化时间、热变形温度、剪切强度和拉伸强度的影响显著;3种配比的胶粘剂耐酸碱性能均较好;当m(改性EP)∶m(固化剂)=100∶50时胶粘剂的综合性能最优,其初步固化时间为6 h、热变形温度为97℃、拉伸强度为72 MPa、剪切强度为3.56 MPa且对ABS的粘接达到材料破坏的程度。该胶粘剂室温固化具有一定的适用期,并具有良好的粘接性能、耐久性能和耐酸性能,可以满足蓄电池极柱灌封和粘接的技术要求。     

碳纳米管改性环氧树脂/碳纤维复合材料的界面性能

采用碳纳米管对环氧树脂体系以及碳纤维进行改性处理,得到四种试样,即CNTs-00 (不添加碳纳米管)、CNTs-01 (碳纳米管与活性分子预反应)、CNTs-02 (碳纳米管与树脂体系直接混合)、CNTs-03 (碳纤维表面生长碳纳米管)。采用视频接触角测量仪以及界面性能测试仪对树脂浸渍国产T800S碳纤维单丝形成的微球形态、微球与纤维的界面接触角及界面剪切强度(IFSS)等进行了分析表征;同时采用模压法制备了复合材料单向板,从宏观尺度表征了其层间剪切强度(ILSS)。结果表明,与CNTs-00相比,CNTs-01的树脂界面浸润性以及复合材料IFSS有了较大提高,接触角减小了3.1°,IFSS提高了12.7%,ILSS提高了9%;CNTs-02的树脂界面浸润性略有降低,接触角增大了0.9°,IFSS降低了8.6%,ILSS与CNT–00基本相同;CNTs-03的界面浸润性降低,浸润角增大了4.5°,IFSS降低了5.7%,ILSS降低了11.5%。     

可移性压敏标签的制备及性能研究

在相同的原料配比下,通过三种不同溶液聚合工艺制得丙烯酸酯高聚物A01,A02和A03.它们的初黏性,180°剥离强度和固含量相差不大,然而A01和A02的黏度太大,导致涂布困难,而A03的持黏性较低.通过引入交联剂Al-acac和GA-240进行改性,大大提高了A03的持黏性.交联改性后的A03涂布于PET膜和铜版纸上制得压敏胶签,其中PET膜类标签可剥离性能良好,在不锈钢板,有机玻璃板、环氧板等材料上均可无损剥离.而制得铜版纸标签进行实物黏贴表明,在部分常见日用品(如水杯、手机壳,苹果等)均可无损剥离,但在鸡蛋揭离标签时会发生纸张撕裂现象.     

可移性压敏标签的制备及性能研究

在相同的原料配比下,通过三种不同溶液聚合工艺制得丙烯酸酯高聚物A01,A02和A03.它们的初黏性,180°剥离强度和固含量相差不大,然而A01和A02的黏度太大,导致涂布困难,而A03的持黏性较低.通过引入交联剂Al-acac和GA-240进行改性,大大提高了A03的持黏性.交联改性后的A03涂布于PET膜和铜版纸上制得压敏胶签,其中PET膜类标签可剥离性能良好,在不锈钢板,有机玻璃板、环氧板等材料上均可无损剥离.而制得铜版纸标签进行实物黏贴表明,在部分常见日用品(如水杯、手机壳,苹果等)均可无损剥离,但在鸡蛋揭离标签时会发生纸张撕裂现象.     

一种室温快速固化超强环氧树脂胶黏剂的制备及性能

以苯基缩水甘油醚、E-51环氧树脂、季戊四醇四(3-巯基丙酸)酯等为原料,合成了一种新型的可室温快速固化的聚硫醇固化剂。探讨了固化剂含量和促进剂含量对EP胶黏剂的固化速率和拉伸剪切强度等影响,采用单因素试验法优选出EP/固化剂的最佳配比,并在相同条件下与使用进口固化剂的胶黏剂性能进行了对比。结果表明:当m(环氧树脂)∶m(固化剂)=0.8∶1、ω(DMP-30)=5%时,凝胶时间为5min,拉伸剪切强度可达到24.4MPa,耐热性良好,在耐水性方面相比于进口产品具有一定的优势。     

气固相法合成氯化聚氯乙烯树脂

在流化床反应嚣中,研究了紫外光引发的氯化聚氯乙烯(CPVC)树脂的合成过程,考察了反应时间、反应温度、原料气中φ(Cl2)和紫外光强度对产品w(Cl)的影响.较佳的反应条件为:反应时间1.5 h,反应温度110℃,原料气中φ(Cl2)为30%,紫外光波长为300 nm,紫外光强度为211μW/cm2.合成的CPVC产品...     

Curing of crust leather by ultraviolet radiation with urethane acrylate: Role of pigment

Eight different formulations were developed with four diacrylate reactive monomers such as tripropylene glycol diacrylate (TPGDA), 1,4‐butanediol diacrylate (BDDA), 1,6‐hexanediol diacrylate (HDDA), and 2‐ethylene glycol dimethacrylate (EGDMA) and aromatic urethane diacrylate (M1100) in order to modify the crust leather surface. To study the effect of pigment on the performance of ultraviolet (UV)‐cured leather surface, 1% pigment (congored) was incorporated in the formulations. Irgacure 369 (2%) was also used in the formulation as photoinitiator. The gel content, tensile strength, elongation at break, and pendulum hardness of UV‐cured thin films with and without pigment was studied. The films without pigment produced better properties. Among all the diluents, BDDA‐containing films showed the best performance. Different properties of UV‐coated leather surface such as pendulum hardness, tensile strength, elongation, gloss (at 20° and 60°), adhesion, and abrasion were studied. Effect of gloss on simulating weathering was also performed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 692–697, 2002     

Comparison of mechanical and degradation properties of EG and EGDMA grafted gelatin films

Thin films of gelatin were prepared from gelatin granules in aqueous medium by casting and its mechanical properties like tensile strength (TS), tensile modulus (TM), and elongation at break (Eb %) were studied. Gelatin films were procured with two types of monomers such as 5% ethylene glycol (EG) and 5% ethylene glycol dimethacrylate (EGDMA) to increase the mechanical properties. Five percent of monomer solutions were prepared in MeOH along with 2% photoinitiator; Irgacure-651. Soaking time and UV radiation intensities were optimized with the extent of polymer loading (PL) and the mechanical properties of the cured films. Comparing the properties of EG and EGDMA treated gelatin film, EG showed the best performance. The EG-cured gelatin film with 5?min soaking time showed the highest tensile strength (58.6?MPa) and elongation at break (11.2%). The water uptake was determined for raw film (500.1%), EG grafted gelatin film (375.3%), and EGDMA grafted film (412.9%). The degradation properties in water and soil were determined for the raw and cured gelatin films. It was observed that the raw film degrades more than that of the treated films.     

Acrylate-based photosensitive resin for stereolithographic three-dimensional printing

In this article, we report an acrylate-based three-dimensional (3D) printing stereolithography rapid-prototyping photosensitive resin with a low viscosity, small volumetric shrinkage, high photoreactivity, and excellent strength. The resin was a compound prepared with bisphenol A epoxy acrylate (BAEA) as the main matrix, 1,6-hexanediol diacrylate (HDDA) and tri(propylene glycol) diacrylate (TPGDA) as reactive diluents, pentaerythritol triacrylate (PETA) as the crosslinking agent, and 2-hydroxy-2-methyl propiophenone (1173) and diphenyl(2,4,6-trimethyl benzoyl)phosphine oxide (TPO) as photoinitiators. The photocuring kinetics of the resins with different photoinitiator types and loadings were studied via real-time IR spectroscopy, which provided insights into the optimization of photoinitiator composition and printing parameter settings. The results show that the content change of each component affected the viscosity of the photosensitive resin; this was accompanied by fluctuations in the volume shrinkage and mechanical strength of the cured products. Although an increase in the molar ratio of the reactive diluent remarkably reduced the viscosity of the photosensitive resin and thereby boosted photopolymerization, it also caused an increase in the volume shrinkage and a sacrifice of mechanical strength. Finally, as shown by a comparison of the other samples we studied, the resin composed of 30 mmol HDDA, 50 mmol TPGDA, 10 mmol PETA, 10 mmol BAEA, 2.5 mol % TPO, and 2.5 mol % 1173 achieved the best viscosity of 239.53 mPa s at 25 °C, the minimum shrinkage rate of 4.36%, and the maximum tensile strength of 43.19 MPa. The 3D printing curing products had the closest size to the design dimensions of the computer-aided design model; this indicated that the resin seemed to be a most promising candidate for 3D printing applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47487.     

Mechanical properties development of sodium alginate films with additives by UV‐radiation processing

To improve mechanical properties of polymer films; sodium alginate (SA) films was prepared with ethylene glycol (EG) and photocured. The formulation was prepared at various concentration with EG and photoinitiator (2%) in methanol. The mechanical properties were optimized in case of monomer (EG) concentration, soaking time, and radiation dose of intensities. The highest polymer loading (PL) was 7.1% and tensile strength (TS) of the film was 37.9 MPa were found for 3 min soaking in 5% EG containing formulation at 20th pass of UV radiation; the highest value (22%) of elongation at break (Eb) was obtained at 1 min soaking time at 15th passes of UV doses. The mechanical properties improvement of the films varied acrylic monomers; such as 2‐ethylhexylacrylate (EHA), 1,4‐butanediol diacrylate (BDDA), and trimethylpropane triacrylate (TMPTA) were used as additives (2%) in the optimized formulation. The highest PL (12.7%) and TS (42.2 MPa) of the films are at 5% EG, 2% TMPTA, and 2% photoinitiator in methanol at 3 min soaking time at 20th pass of UV radiation. The highest Eb (25%) was obtained using additives 2% EHA additives in 5% EG and 2% photoinitiator in methanol at 3 min soaking time. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

用于JS防水涂料的醋丙乳液的合成

通过对一种醋丙型防水乳液共聚配方的研究,在乳液反应过程中添加AP-02保护胶和交联单体N-羟甲基丙烯酰胺、A171有机硅氧烷、丙烯酸-2-羟丙酯对醋丙乳液进行改性,提高了乳液的耐水性能、粘结强度和抗拉强度;调胶时,加入分散剂DA-02,保证水泥粉在乳液中更好地的分散。并综合各方面因素对乳液性能的影响,得出了最优配方,即w(AP-02)=1.2%(乳液总量)、w(A-171)=0.7%(单体总量)、w(NMAM)=2.0%(单体总量)、w(DA-02)=2.0%(乳液总量)时,得到醋丙型乳液可以满足聚合物水泥防水涂料的要求。     

复合交联型JS防水乳液的研制

通过对一种JS乳液共聚配方的研究,在乳液反应过程中添加乳化剂和交联单体肛羟甲基丙烯酰胺、有机硅氧烷对JS乳液进行改性,提高了乳液的耐水性能、黏结强度和抗拉强度;调胶时,加入分散剂DA-02,保证水泥粉在乳液中更好地分散。并综合各方面因素对乳液性能的影响,得出了最优配方,即ⅥW_H-870=0．6％（乳液总量）、W_A-17=0．7％（单体总量）、W_NMAM=2．0％（单体总量）、W_DA-02=2．0％（乳液总量）时,得到JS乳液可以满足聚合物水泥防水涂料的要求。     

Photoinitiated surface grafting of synthetic fibers,I. Photoinitiated surface grafting of ultra high strength polyethylene fibers

Photoinitiated surface grafting of acrylic monomers has been carried out onto high strength polyethylene (HSPE) yarn by means of a continuous process. The grafting reaction is initiated by UV irradiation of the yarn after presoaking in an acetone solution of initiator and monomer. Four initiators, benzophenone (BP), 4-chlorobenzophenone (4-CBP), 2-hydroxy-2-cyclohexylacetophenone (HHA), and 2,2-dimethoxy-2-phenylacetophenone (DMPA), and two monomers, acrylic acid (AA) and acrylamide (AM), have been used. After short irradiation time (10 to 20 s) successful grafting is obtained, as shown by ESCA and IR-ATR spectra, dye adsorpotion from aqueous solution, and measurements of adhesion of single filaments to epoxy resin. Grafting efficiency of 74% has been reached for AA as monomer (26% is homopolymer). The tensile strength and modulus of the HSPE yarn are retained in the grafting process. The degree of surface grafting is mainly a function of structure and concentration of monomer and photoinitiator in the presoaking solution and of the irradiation conditions used. Increasing irradiation time gives increasing amounts of grafted polymer up to a certain limiting value. The reactivities of the four initiators have been compared showing the highest grafting yields of AA with BP and of AM with 4-CBP as photoinitiator. AA grafted HSPE yarn can be dyed to rather deep color by dipping in an aqueous solution of Crystal Violet. Increased dye absorption by a factor of up to seven has been measured for yarn grafted with AA to the maximum level obtained. The filaments of the grafted yarn show increased adhesion to epoxy resin by a factor of up to five compared with the ungrafted filaments.     

Novel pyridinium derivatives as very efficient photoinitiators for UV-activated synthesis of acrylic pressure-sensitive adhesives

During the development of synthesis of acrylic pressure-sensitive adhesives, newly synthesized pyridinium derivatives were used by the UV-initiated polymerization quarantines of new polymer design for the synthesized self-adhesive acrylics with excellent performance, for which tack, peel adhesion, shear strength and shrinkage were measured. For example, the best tack and peel adhesion performances were achieved after 30 and 60 s UV radiation for 3.0 wt% pyridinium photoinitiator PPP, after 60 and 90 s UV exposure for 4.0 wt% pyridinium photoinitiator HPP and after 90 s UV-crosslinking in the case of 5.0 wt% pyridinium photoinitiator OPP. An increase of novel pyridinium photoinitiators concentration causes in an increase of the monomers conversion. For high photoinitiator content, characterized for each investigated photoinitiator, ranging from about 3.0 (PPP) to 5.0 wt% (OPP), the degree of monomer conversion reaches a maximum value of about 99.6 wt%.Preliminary results are reported illustrating the effectiveness of the acrylic PSA development.     

分散剂对纳米四氧化三铁磁流体稳定性的影响

通过球磨手段,经表面活性剂表面处理颗粒,制备稳定分散纳米四氧化三铁磁性液体。选择表面活性剂GD-01、GD-02和GD-03,研究了溶液pH、球磨时间和表面活性剂用量对磁性液体分散性的影响,采用红外光谱分析仪（FT-IR）和高分辨透射电子显微镜（HRTEM）表征磁性液体中的颗粒。结果表明： GD-02的最佳pH为4.5,GD-01和GD-03的最佳pH为2.5,最佳球磨时间皆为5 h,最佳表面活性剂为GD-02,其最佳用量为0.5 g左右,此时颗粒表面形成稳定的吸附双电层结构,通过静电位阻和空间位阻作用,阻止颗粒团聚,制得分散性能很好的纳米磁性液体。