Study on bonding properties of PVC-based WPC bonded with acrylic adhesive☆

In this paper, the bonding properties of polyvinylchloride (PVC)-based wood–plastic composite (WPC) materials bonded with acrylic adhesive have been studied. The results showed that dry compression shear strength of bonded specimens glued with acrylic adhesive was 6.12?MPa, and reached 58.8% of the strength of the PVC-based WPCs. The results also showed that wet compression shear strength in accordance with Chinese standard GB/T17657 was 0.9 times the dry compression shear strength of 5.48?MPa. In addition, the retention rate of the compression shear strength of the bonded specimens gluing with acrylic adhesive after UV aging for 7?days and 14?days was 69.1 and 66.8%, respectively. The aging was done in accordance with UV-aging test process as given in this paper. The scanning electron microscopy (SEM) analysis of the bonded specimens of PVC-based WPCs showed that the J-39 acrylic adhesive penetrated into the adjacent porous regions of the PVC-based WPC which had resulted from foaming. This penetration enhanced the mechanical interlocking between the substrate and the acrylic adhesive.     

MMA—BA—MAA树脂自由基共聚合成的研究

以过氧化二苯甲酰为引发剂,采用溶液聚合合成了甲基丙烯酸甲酯（MMA）．丙烯酸丁酯（BA）＋甲基丙烯酸（MAA）树脂,通过实验确定了自由基共聚合适宜的单体配比、单体浓度、引发剂浓度、溶剂以及反应的升温速度。该改性后的丙烯酸树脂可作为胶粘剂的大分子固化剂,能提高粘接强度和透明性。     

改性CPP的表征及其对PP附着性能的影响

采用混合单体甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和2-甲基丙烯酸(MAA)对氯化聚丙烯(CPP)进行接枝改性,制备了几种不同接枝率的改性CPP,并用红外光谱和热分析仪对其进行了表征,探讨了改性CPP在PP基材上的附着性能。结果表明:改性CPP在PP塑料上具有良好的附着力;随着接枝率的提高,改性CPP与丙烯酸树脂的相容性增强,其混合液在PP塑料上的附着力达到100%,可用来制备直接涂覆的PP涂料。     

Effect of poly(vinylidene fluoride) binder crystallinity and graphite structure on the mechanical strength of the composite anode in a lithium ion battery

We have evaluated the mechanical strength of a series of composites consisting of carbon particles bound together by poly(vinylidene fluoride) (PVDF), which is closely related to the carbonaceous anode in a lithium ion battery. We used a balanced beam scrape adhesion tester and evaluated the influence of carbon particle structure, the chemical properties of PVDF, and the processing parameters of annealing temperature and casting solvent on the adhesion of the composite film to a copper substrate. The composite prepared with amorphous carbon shows over 10 times higher adhesion strength than those fabricated from other graphite materials. This results from chemical binding that is intermediate between semi-ionic and covalent C-F bonds, as detected by X-ray photoelectron spectroscopy. To address the effect of the crystalline phase of the binder on the adhesion strength, we investigated PVDF crystallinity in the composite films using differential scanning calorimetry. Samples with higher crystallinity show higher adhesion strength, independent of annealing temperature and casting solvent. The scratch adhesion was also measured for swollen electrodes immersed in 3:7 volume ratio of ethylene carbonate:ethyl methyl carbonate (EC:EMC) at different temperatures. After being swollen, the composite films prepared from PVDF modified with hydroxyl functional groups show higher adhesion strengths than the others due to their low uptake of the electrolyte solvent.     

Two‐component acrylic structural adhesive initiated by tributylborane for untreated PET adhesion

In order to improve the adhesion strength of acrylic adhesive to untreated poly(ethylene terephthalate) (PET) substrate, two‐component acrylic structural adhesives initiated by tributylborane were prepared. The effects of acrylic monomers, elastomers, decomplexers, and oligomers on the adhesion properties of two‐component acrylic structural adhesive were investigated in sequence. It is found that the shear strength on PET of adhesives toughened by acrylonitrile–butadiene–styrene copolymer and carboxyl‐terminated butadiene–acrylonitrile copolymer is higher than that of commercial adhesives Dp8010NS and Loctite 3030. A tailored oligomer was synthesized from hydroxyl propyl–terminated polydimethylsiloxane and 3‐isopropenyl‐α,α‐dimethylbenzyl isocyanate. It is also noticed that premature failure usually takes place in the lap shear test samples due to the brittleness of the acrylic adhesive, except in the sample of adhesive modified by tailored oligomer. Excellent adhesion to the PET substrate is achieved by this adhesive modified by tailored oligomer, with a lap shear strength above 11 MPa and T‐peel strength up to 5.34 N/mm. Additionally, the resulting adhesive is qualified for the structural bonding of PET materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46612.     

无三苯CR/SBS/MMA/BA自交联鞋用胶粘剂的研制

采用复合引发剂 ,以N 羟甲基丙烯酰胺 (NAM )及丙烯酸 (AA)为功能单体 ,与CR、苯乙烯 丁二烯嵌段共聚物 (SBS)、甲基丙烯酸甲酯 (MMA)和丙烯酸丁酯 (BA)进行多元共混接枝共聚 ,再配以混合型增粘树脂 ,研制出不含苯、甲苯和二甲苯 (简称三苯 )自交联环保型鞋用胶粘剂。探讨了SBS用量、MMA/BA配比、功能单体NAM及AA用量对胶粘剂粘合性能的影响。结果表明 ,CR/SBS/MMA/BA/AA/NAM自交联型接枝胶粘剂对非极性鞋材的粘合性能明显优于CR/MMA/BA三元接枝胶和CR/SBS/MMA/BA四元接枝胶。     

废EPS改性制备清香型乳液胶粘剂及粘接应用研究

以MAA(甲基丙烯酸)和PVA(聚乙烯醇)为主要原料,以BPO(过氧化苯甲酰)为引发剂,以乙酸乙酯、丙酮和废弃橙皮精油作为废EPS(聚苯乙烯泡沫塑料)的混合溶剂,制备了清香型废EPS改性胶粘剂。研究结果表明:当混合溶剂中V(乙酸乙酯)∶V(废弃橙皮精油)∶V(丙酮)=5∶3∶2时,其对废EPS的溶解力(8.20 g/10 mL)最强;采用正交试验法优选出制备废EPS改性胶粘剂的最佳工艺条件为w(EPS中MAA)=8%、w(EPS中BPO)=3%、反应温度70℃和w(胶液中PVA)=10.0%,此时改性胶粘剂胶接实木单板的剪切强度可达到0.825 MPa,并且其对织物纤维、纸张等胶接性能良好。     

Biodegradable self-adhesive tapes with starch carrier

The disposed pressure-sensitive adhesive (PSA) tape widely used in daily life has been contaminating the environment and producing the vastly non-degradable trash. In this pioneering work, the advanced biodegradable pressure-sensitive double-coated tape containing starch carrier and water-soluble partially degradable modified pressure sensitive adhesive is architecturally designed and fabricated. The results have illustrated the excellent tack and peel adhesion of these newly constructed biodegradable self-adhesive tapes, and high thermal shear strength. Most importantly, the complete biodegradability of starch carrier and partially biodegradability of modified acrylic pressure-sensitive adhesives (PSA) have been confirmed experimentally. This environmentally friendly technology based on the starch resource utilization and novel water-soluble PSA will have great potentials for diverse applications such as the paper industry for manufacturing of ecological biodegradable product, the production of water-soluble biodegradable labels, medical tapes and biomedical electrodes.     

稻秸秆/玉米淀粉胶复合材料的制备及性能

以玉米淀粉为原料,H2O2为氧化剂,制得氧化玉米淀粉胶。利用模压方法制备了稻秸秆/玉米淀粉胶复合材料,基于正交试验方法,研究了原料配比对复合材料的密度、抗压强度、吸湿性及可降解性能的影响。结果表明:稻秸秆/玉米淀粉胶复合材料密度随稻秸秆含量增加,先升高后降低;当稻秸秆含量为16.3%时,复合材料密度最小;随玉米淀粉胶含量增加复合材料抗压性能降低。当稻秸秆∶改性淀粉∶玉米淀粉胶∶滑石粉∶碳酸氢氨的质量比为6∶9∶15∶5∶1时,复合材料抗压强度较高。稻秸秆/玉米淀粉胶复合材料在潮湿环境下的降解性能良好,但与聚苯乙烯泡沫塑料相比易吸潮。     

纳米聚丙烯酸酯改性纳米Mg(OH)_2及其在LDPE中的应用

采用纳米聚丙烯酸酯乳液改性纳米Mg(OH)2,通过单螺杆挤出机制备了纳米Mg(OH)2/低密度聚乙烯(LDPE)复合材料,利用红外光谱、扫描电镜、透射电镜等方法对改性前后的Mg(OH)2及Mg(OH)2/LDPE复合材料进行了表征。结果表明:纳米Mg(OH)2表面经纳米聚丙烯酸酯乳液改性后吸附上了一层聚丙烯酸酯;纳米聚丙烯酸酯乳液改性提高了纳米Mg(OH)2的热稳定性,分解温度提高了27℃;改性纳米Mg(OH)2在LDPE基体中分散更为均匀;改性纳米Mg(OH)2的用量为LDPE的15%时复,合材料的拉伸强度比纯LDPE提高了6.5%。     

水性聚氨酯的改性研究

分别采用丙烯酸酯、环氧树脂合成2种不同的改性水性聚氨酯,比较了改性前后及2种不同的改性水性聚氨酯在乳液、涂膜性能及粘接性能方面的差异。结果表明,改性后的水性聚氨酯综合性能明显提高,其中环氧树脂改性水性聚氨酯(EPU)在固化交联后涂膜的耐水、耐溶剂及力学性能又明显好于丙烯酸酯改性水性聚氨酯(PUA),其粘接强度与溶剂型聚氨酯相当;而采用丙烯酸酯改性的水性聚氨酯PUA乳液稳定性好于EPU乳液。     

Fabrication of an epoxy graft poly(St-acrylate) composite latex and its functional properties as a steel coating

A novel method for preparing epoxy graft poly(St-acrylate) composite latex with high graft ratio has been devised. First, esterification was carried out between acrylic acid and an epoxy resin using the monomer as the solvent. The obtained sample, still in solution in the monomer, was emulsified to miniemulsion droplets together with other monomers. Finally, the epoxy graft acrylate composite latex was prepared by miniemulsion copolymerization. This technology will eliminate pollution arising from the organic solvent when solvent-borne systems are used. The enhanced graft ratio was confirmed by FTIR and ¹H NMR measurements. The results indicated that the acrylic monomer was grafted onto the epoxy chain. TEM showed the graft composite latex to have a spherical structure with diameter 100 nm. The adhesive performance and anti-corrosive properties on a steel substrate, as measured by salt-spray resistance, were maximized when 4.0% acrylic acid was added to the epoxy resin. Dynamic mechanical analysis (DMA) has been employed to test the damping properties of the composite latex coatings. It was interesting that the tan δ peak values of the coatings were as high as 2.15, clearly exceeding those of general damping materials. Our findings suggest great potential for the composite latex in the field of functional steel coatings.     

三元共聚丙烯酸酯压敏胶粘剂的合成

以丙烯酸丁酯 (BA)、苯乙烯 (St)、甲基丙烯酸甲酯 (MMA)为原料 ,用过氧化二苯甲酰 (BPO)为引发剂 ,在甲苯溶剂中 ,三元共聚合成了丙烯酸压敏胶粘剂 ;考察了St、MMA用量及共聚温度对压敏胶剥离强度与固体含量的影响 ,发现在c(BPO) =4× 10 -2 mol/L ,共聚温度为 70℃ ,各单体用量为 :n(MMA) =0 .3mol、n(St) =0 .2mol、n(BA) =0 .5mol时 ,合成的压敏胶粘剂具有高剥离强度 ( 13 .9N/ 2 5mm)与高固含量 ( 64% ) ,这些性能指标均优于商品压敏胶。     

聚氨酯改性丙烯酸酯水性塑／塑复膜胶的研制

通过种子乳液聚合和单体预乳化工艺制备了一种塑／塑聚氨酯改性丙烯酸酯乳液复膜胶（GH-5142）。研究了聚氨酯加入工艺、丙烯酸酯单体类型、配比、乳化剂体系等对乳液性能的影响。实验结果表明,聚氨酯占乳液总量的2％,软硬单体质量比为1．5,乳化剂用量15％-2．0％,所得复膜胶性能较佳。     

酸性活性修饰剂对白泥/丁腈橡胶复合材料力学性能的影响

利用丙烯酸和对乙烯苯磺酸作为白泥的修饰剂,对白泥进行湿法修饰,而后利用石蜡对白泥进行二次包覆制备了有机修饰活性白泥,并将其作为橡胶填料填充到丁腈橡胶(NBR)中制备了修饰白泥/NBR(400:100)母胶,而后将母胶填充到NBR中制备了不同白泥含量的白泥/NBR复合材料。考察了不同修饰量制备的母胶对复合材料硫化性能的影响、母胶及用量对NBR复合材料的性能影响。实验结果表明:当加入修饰剂的用量逐步增加(以干白泥质量计算)时,母胶填充的白泥/NBR复合材料的力学性能呈现先增大后减小的趋势。酸性活性剂用量为白泥2%的母胶且母胶份数为100phr时其白泥/NBR复合材料的力学性能达到最佳值。但是两种活性修饰剂修饰的白泥母胶在改性NBR性能上存在差异:丙烯酸修饰白泥母胶制备的白泥/NBR复合材料的力学性能为拉伸强度8.3MPa、扯断伸长率386%、300%定伸应力3.7MPa、硬度79;乙烯苯磺酸修饰白泥母胶的力学性能为拉伸强度9.8MPa、扯断伸长率652%、300%定伸应力4.2MPa、硬度78。研究表明:利用丙烯酸、对乙烯苯磺酸作为白泥的修饰剂并制备橡胶母胶可大幅度提高橡胶材料的力学性能,可作为白泥综合利用的一种有效方法。     

快固型胶粘剂的研制

研制成用聚氨酯丙烯酸树脂 (PUA)改性的室温快固型双组分丙烯酸酯胶粘剂 ,结果表明 ,它对金属的粘接强度高达 12 .5MPa ,最小固化定位时间 2 5s ,伸长率较高 ,对它的储存稳定性也作了改进     

硅酸盐水泥基复合电解质的制备及其在建筑储能器件中的应用

近几年,将水泥基复合材料用于建筑储能已成为研究热点之一。本文将硅酸盐水泥、丙烯酰胺(AM)混合制备了一种优化的水泥基复合结构电解质,并研究了AM质量分数分别为0%、25.0%、27.5%、30.0%、32.5%和35.0%时对结构电解质的离子电导率、力学性能及微观结构的影响。研究结果表明,增加AM的掺量有助于提高硅酸盐水泥基复合电解质的离子电导率,同时会不可避免地降低电解质的抗压强度。当AM掺量为30.0%时,可以使离子电导率和抗压强度达到理想平衡,抗压强度高达41.1 MPa,离子电导率最大为22.47 mS·cm^-1。此外,对结构电解质与还原氧化石墨烯(rGO)电极组装成一体式的结构超级电容器进行了一系列电化学性能测试,发现AM掺量为30.0%的硅酸盐水泥基复合电解质构成的结构超级电容器的面积比电容最大可以达到96.8 mF·cm^-2。在恒定电流为0.1 mA·cm^-2下充放电循环5 000次后,该结构超级电容器的面积比电容值保持率为91.08%,该结构超级电容器在建筑储能领域具有广阔的应用前景。     

复合金属板用高强度耐腐蚀聚酯型热熔胶的研制

按照m[氯乙烯醋酸乙烯酯(VC-VAc)]∶m[二月桂酸二丁基锡(DBTDL)]∶m[邻苯二甲酸二丁酯(DBP)]∶m(硬脂酸钙)=50∶3∶4∶1比例配制复合氯醋树脂,然后以此作为聚酯热熔胶的改性剂。结果表明:当w(复合氯醋树脂)=30%(相对于热熔胶而言)时,改性热熔胶的粘接强度为7.6 MPa,Tg提高到91.2℃;改性热熔胶在10%醋酸或40%NaOH溶液中浸泡48 h后未发生剥离现象,其最大粘接强度分别为6.68 MPa和6.39 MPa;经5%NaCl喷雾24 h或10%Na2CO3溶液浸泡48 h后,其性能最接近未浸泡试样;该高性能热熔胶适用于双金属板的热复合。     

环保型无溶剂环氧封端聚氨酯胶黏剂的研制

无溶剂聚氨酯胶黏剂是一种新型的环保型胶黏剂,有着比水性聚氨酯更加优异的性能。实验采用聚多元醇（PPG、PTMG）、甲苯二异氰酸酯（TDI）为主要原料,在特定条件下合成聚氨酯预聚体（PUP）,然后加入环氧树脂（E44）和缩水甘油（Glycidyl）对聚氨酯预聚体进行封端反应,再加入环氧树脂（E44）与活性稀释剂,制备出环保型无溶剂环氧封端聚氨酯/环氧树脂胶黏剂,同时采用固化剂间苯二甲胺（m-XDA）与促进剂2,4,6-二氨基甲基苯酚（DMP-30）固化,大大提升了体系的固化速度。考查了不同配比的聚氨酯与环氧树脂,及采用不同的活性稀释剂对胶黏剂的性能的影响,结果表明：添加了15%的660型稀释剂的G/E-PU（PTMG-2000）/EP（E-44）/活性稀释剂复合体系的黏度仅为0.3Pa.s;加入5%的D-085型稀释剂的G/E-PU（PTMG-2000）/EP（E-44）/活性稀释剂体系其拉伸剪切强度最好,可以达到21.63MPa。     

无三苯CR/SBS/MMA/BA自交联环保型鞋用胶的合成与表征

在不含"三苯"的溶剂中,研究了氯丁橡胶(CR)、SBS、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、自交联剂N-羟甲基丙烯酰胺(NAM)及丙烯酸(AA)的多元共混接枝共聚,着重讨论了SBS用量、MMA/BA配比,复合交联剂NAM及AA用量、复合引发剂用量、聚合温度和聚合时间对胶粘剂粘合性能的影响,并用红外光谱对接枝产物进行了表征。研究结果表明:所研制的CR/SBS/MMA/BA/AA/NAM自交联环保型接枝胶对非极性鞋材的粘接性能优良。