一种橡胶型锂电池压敏胶粘带的研制

以天然橡胶(NR)为弹性体,松香树脂、石油树脂为增粘树脂,再加入交联剂和防老剂等助剂,制备一种以PET为基材的锂电池胶粘带DG2161,其剥离力为2～3 N/25mm,耐温120℃/2 h不残胶,耐电解液80℃/3 d剥离力无显著变化、不脱胶。     

反应型聚氨酯热熔压敏胶的研制

以聚酯多元醇、MDI(4,4′-二苯基甲烷二异氰酸酯)和液态松香增黏树脂等为主要原料,采用本体聚合法制备了反应型PU-HMPSA(聚氨酯热熔压敏胶)。反应型PU-HMPSA具有压敏性和一定的初始剥离强度,可制成PSA(压敏胶)胶带制品,粘接后经湿气固化,剥离强度明显提高。研究结果表明:当w(无定型聚酯多元醇EVONIK-7130)=20%、w(液态聚酯多元醇A)=30%、w(多官能度聚酯多元醇XCP-2325)=5%和w(液态松香增黏树脂)=3%(均相对于物料总质量而言)时,PU-HMPSA的综合性能相对最好,其初粘力为14#(钢球)、初始180°剥离强度为22 N/25 mm、最终180°剥离强度为75 N/25 mm和玻璃化转变温度为-32.61℃。     

高耐温性钢塑管材用热熔胶黏剂的制备及性能研究

以神华均聚聚丙烯（PP）为基体树脂,通过与聚烯烃弹性体（POE）共混反应挤出制备了高耐温性钢塑管材用热熔胶黏剂。研究了引发剂含量、接枝单体含量和PP/POE配比对热熔胶性能的影响,考察了自制热熔胶在实际应用中的耐温性能。结果表明,反应挤出制备的聚丙烯接枝马来酸酐(PP?g?MAH)基热熔胶综合性能优异,其剥离强度和100 %拉伸弹性回复率分别可达131.4 N/25 mm和65.5 %;高低温循环（-40~130 ℃）800次后自制热熔胶的剥离强度依然可以维持在122.2 N/25 mm,剥离失效率只有7.0 %,其耐温性明显优于选取的两个商业化牌号热熔胶。     

环氧化SDS型热熔压敏胶的制备及粘接性能研究

采用苯乙烯-丁二烯-苯乙烯(SBS)和苯乙烯-异戊二烯-苯乙烯(SIS)嵌段共聚物,并配合极性的环氧化SBS(ESBS)和环氧化SIS(ESIS)作为基体材料,制备了环氧化SDS(苯乙烯系热塑性弹性体)型热熔压敏胶。研究了ESBS和ESIS用量对压敏胶的初粘力、持粘力和在不同极性底材上剥离强度的影响。结果表明,随着ESBS和ESIS用量的增加,压敏胶的初粘力和持粘力下降,在聚乙烯(PE)上的剥离强度下降,但在聚氯乙烯(PVC)和不锈钢上的剥离强度先增加后下降。当ESBS和ESIS的质量份数均为20份时,压敏胶的初粘力和持粘力分别为23#和43.6 h,在PVC和不锈钢底材上的剥离强度分别达到0.82 N/mm和1.10 N/mm。     

EVA热压粘接PP/m-LLDPE的性能研究

通过接触角和剥离强度的测试,研究了乙烯-醋酸乙烯共聚物(EVA)作为热熔胶热压粘接聚丙烯(PP)和茂金属催化线性低密度聚乙烯(m-LLDPE)的性能,并采用红外、扫描电镜分析了PP/EVA40-2/m-LLDPE复合材料剥离后的破坏区间。结果表明,EVA接触角较小,表面能较高,润湿性较好,采用EVA能有效改善PP/m-LLDPE的粘接性,EVA40-2与PP、m-LLDPE之间的剥离强度分别达到了14.7N/25mm和18.3N/25mm(PP和m-LLDPE剥离强度只有0.8N/25mm);另外,扫描电镜观察PP/EVA40-2/m-LLDPE的剥离表面以及剥离界面,发现在剥离界面处产生大量的无规则塑性形变并存在有少量破坏后的纤维丝,破坏区域发生在PP层和EVA层之间,剥离后,EVA表面凹凸不平,PP表面则较为平滑。     

增黏树脂与弹性体SBS的相容性以及与热熔压敏胶性能的关系

热熔压敏胶(HMPSA)是一类不含溶剂的胶粘剂,在工业应用中占据很大的比重。工业上常用的增黏树脂有松香树脂、萜烯树脂和石油树脂三种。增黏树脂与热塑性弹性体SBS(苯乙烯/丁二烯/苯乙烯嵌段共聚物)的相容性存在一定的差异性,从工业角度重点研究和比较了增黏树脂的结构差异与性能之间的关系,并对其一般规律进行了探索。研究结果表明,当增黏树脂的软化点为100～110℃时,相应的HMPSA可获得较低的熔融黏度和较高的剥离强度,其初粘力为1～2cm;当增黏树脂的软化点为100℃时,剥离强度依次为含萜烯树脂HMPSA>含松香树脂HMPSA>含石油树脂HMPSA;当W(增黏树脂)= 210%时(相对于弹性体SBS而言),含石油树脂HMPSA的综合性能劣于含松香树脂(或含萜烯树脂)的HMPSA;当W(增黏树脂)≥210%时,HMPSA的熔融黏度低于10000mPa·s,但持粘力增强(即意味着内聚力增强)。     

光引发聚合法制备光致失黏胶

利用光引发聚合法取代传统热聚合合成一种能够制备光致失黏胶的聚丙烯酸酯类共聚物,称为基胶。将基胶与适量的光引发剂及多光敏官能团低聚物复配,得到目标产物。在UV光照前,展现了很好的粘接性能,180°剥离强度可以达到24N/25mm;在20m W/cm~2的365nm波长UV光照下照射20s后,光敏树脂反应产生交联,与直链分子形成互穿网络结构,导致180°剥离强度降至几乎为零,从而展示了很好的失黏性能,便于拆离,而不损坏元器件。进一步探究了基胶成分、多光敏官能团低聚物的种类、用量等多个参数对光致失黏胶综合性能的影响。最后通过扫描电镜,对其失黏机理进行讨论,有两个关键因素导致光照后胶黏剂失黏:低聚物交联过程,引起体积的收缩,与基材粘接面积减小;互穿网络结构造成基胶失去橡胶弹性,表现塑料特性。     

改性型花灯胶粘剂应用性能研究

以环保型混合溶剂体系为分散介质,SBS橡胶弹性体为基料,加入增黏树脂、溶聚丁苯橡胶(SSBR)和抗氧剂,制备出一种环保花灯专用装饰胶。研究了溶剂体系、增黏树脂用量及比例、溶聚丁苯橡胶用量对改性型花灯专用装饰胶性能的影响。研究结果表明:m(6#溶剂油)∶m(乙酸甲酯)为7∶3或8∶2的比例都可以作为产品的较佳溶剂比例;m(C9树脂)∶m(萜烯树脂)∶m(松香树脂)=35∶10∶15时,更加适合作为花灯胶粘剂的增黏树脂;添加SSBR可以改善产品的开放期,同时提高产品的剥离强度,有助于产品粘接后在服役期表现优异。     

耐低温SBS热熔压敏胶的研制与应用

以长链高级脂肪酸(H18)、松香和甘油为原料,合成了低软化点、低酸值、低黏度和高透明性的H18改性松香甘油酯;然后以此作为SBS(苯乙烯-丁二烯-苯乙烯热塑性弹性体)基热熔压敏胶(HMPSA)的增黏树脂,探讨了H18改性松香甘油酯含量对HMPSA性能的影响。结果表明:当w(H18改性松香甘油酯)=10%时,HMPSA的环形初粘力、180°剥离强度相对最大,比未改性体系分别增加了54.81%、35.29%;适量的H18改性松香甘油酯可有效降低HMPSA的玻璃化转变温度(T_g)、提高HMPSA的耐寒性。     

室温固化转移型有机硅压敏胶研究

研制了一种室温固化的可转移有机硅压敏胶，该胶与炸药PBX－1，PBX－2，铝块的剥离强度分别为5.04N/25mm,3.07N/25mm,17N/25mm，与三种炸药PBX－1，PBX－2，JB9014的相容性满足军标要求，该胶转移至硅橡胶泡沫垫层上后，在60℃下加压粘贴于铝块上保持48h后剥离，无压敏胶留于粘接部位。     

PP-R塑铝稳态复合管用热熔胶对铝粘接性能的研究

研究了无规共聚聚丙烯(PP-R)塑铝稳态复合管用热熔胶的主要成分对热熔胶和铝的粘接性能的影响.结果发现,当基材采用丙烯-乙烯-丁烯三元共聚物,且丙烯-乙烯-丁烯三元共聚物、马来酸酐接枝聚丙烯、乙烯类弹性体、石油树脂质量配比为60:25:10:5时,制备的PP-R塑铝稳态复合管用热熔胶对铝的粘接性能最好,剥离强度达到5....     

菱镁板吸塑用聚氨酯胶粘剂的研制

选用低聚物二元醇、二异氰酸酯、二元胺及硅烷偶联剂等合成了菱镁板吸塑聚氯乙烯(PVC)所需的聚氨酯胶粘剂。讨论了多元醇及二异氰酸酯种类、异氰酸酯指数、偶联剂加入方法和用量及胶粘剂相对分子质量等对聚氨酯胶粘性能的影响。结果表明,以聚酯多元醇(PNBA)、甲苯二异氰酸酯(TDI)、扩链剂(IPDA)和偶联剂(KH-550)等原料合成的聚氨酯胶粘剂性能优异,相对分子质量为25 000~40 000,黏度为200 mPa.s~600 mPa.s(固含量30%)。将其喷涂于菱镁板上,真空吸塑PVC后,初黏力大,24 h后终黏剥离强度可达到4.1 N/mm,已达到菱镁板或PVC的破坏程度,满足了使用需要。     

有机硅压敏胶的性能及影响因素

对有机硅压敏胶的几个影响因素进行了考察,在此基础上研制出一种有机硅压敏胶。乙烯基含量为0.3%的MQ硅树脂和相对分子质量为4.0×105的硅橡胶等比例配合,经1.0%的二丁基二月桂酸锡催化缩合,再以1.5%的BPO交联剂200℃下交联10min制得的有机硅压敏胶性能优异,初黏力25#,室温持黏力960min,剥离强度13.45N/25mm。     

Dependence of Peel Adhesion on Molecular Weight of Epoxidized Natural Rubber

The effect of molecular weight of two grades of epoxidized natural rubber (ENR)—i.e., ENR 25 and ENR 50—on the peel strength of an adhesive is studied using coumarone-indene resin, gum rosin, and petro resin as tackifiers. Toluene and polyethylene terephthalate (PET) film acted as the solvent and substrate, respectively. A SHEEN hand coater was used to coat the adhesive on the substrate to give coating thicknesses of 30, 60, 90, and 120 µm. The peel strength of adhesive was determined using a Lloyd Adhesion Tester operating at 30 cm/min. Results show that peel strength has a maximum value at a molecular weight of 6.8 × 10⁴ and 3.9 × 10⁴ for ENR 25 and ENR 50, respectively, an observation which is attributed to the combined effects of wettability and mechanical strength of the rubber at the respective optimum molecular weight of ENR. Peel strength increases with coating thickness for all the tackifiers investigated, with a gum rosin-based adhesive exhibiting the highest peel strength.     

Adhesion property of crosslinked epoxidized (natural rubber)/(acrylonitrile‐butadiene) rubber blend adhesives in the presence of petro resin tackifier

Loop tack, peel strength, shear strength, and morphology of (benzoyl peroxide)‐cured epoxidized natural rubber (ENR 25)/(acrylonitrile‐butadiene) rubber (NBR) blend adhesive were investigated by using petro resin as the tackifying resin. Benzoyl peroxide loading varied from 1 to 5 parts by weight per hundred parts of resin (phr), whereas the petro resin loading was fixed at 40 phr. A SHEEN hand coater was used to coat the adhesive on the polyethylene terephthalate substrate at 30 μm and 120 μm coating thicknesses. (ENR 25)/NBR adhesive was crosslinked at 80°C for 30 min prior to the determination of adhesion strength by a Lloyd adhesion tester operating at 10–60 cm/min. Results show that maximum loop tack and peel strength occur at 2 phr of benzoyl peroxide loading, whereby optimum cohesive and adhesive strength are obtained. However, shear strength increases with increasing benzoyl peroxide concentration, an observation that is associated with the steady increase in the cohesive strength. Scanning electron microscopy micrograph shows that little adhesive remained on the substrate at 0 phr compared with 2 phr of benzoyl peroxide loading, indicating that crosslinking increases the peel strength of the adhesive. In all cases, the adhesion properties increase with coating thickness and testing rate . J.VINYL ADDIT. TECHNOL., 24:93–98, 2018. © 2015 Society of Plastics Engineers     

Beiträge zur galvanisierung von polymeren, 7. Metallisierung von epoxidharzen mit hilfe von haftvermittlern

Epoxy resins can be coated with a metal after being covered with a platable adhesive. Such an adhesive consists of a partly epoxidized styrene-butadiene-styrene block copolymer, an epoxy prepolymer and an amine curer. The contents of these substances in the mixture and the nature of the amine influence the peel strength of the metal layer. The maximum peel strength with a value of about 45 N/25 mm was obtained after using a low molecular weight amine, while values of only about 10 N/25 mm could be obtained with amines of higher molecular weight.     

Effect of modified phenolic resin on crosslinked network and performances of polyvinyl acetate blending emulsion

The water‐soluble phenolic resin (PF) and the poly(vinyl alcohol) (PVA) modified phenolic resin (PPF) were synthesized by alkali catalysis method. Both were used as curing agents to blend with the polyvinyl acetate (PVAc) emulsion. The obtained PF, PPF and blending emulsion were characterized by FT‐IR, DSC, DLS, TEM, and viscosity analysis. The thermal stability of latex films was enhanced after blending. When the PF and PPF content was up to 15 wt %, the peel strength of the blending emulsion increased from 17.89 N/25 mm to 21.32 N/25 mm and 23.37 N/25 mm and the shear impact strength were 1.4 and 1.6 times that of unmodified emulsion adhesive, respectively. Moreover, the modification effect of PPF was better than PF due to its tough crosslinked network. Finally, layer cohesion played an increasingly important role in bonding forces with the increment of the PPF content by the glue residue analysis. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46448.     

Synthesis of SIS-based hot-melt pressure sensitive adhesives for transdermal delivery of hydrophilic drugs

A series of epoxidized styrene–isoprene–styrene (SIS) copolymer was obtained with in situ epoxidation. Their epoxidation degrees were analyzed by ¹H nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy. SIS, Epoxidized SIS (ESIS), C5 resin, mineral oil and antioxidants were melt-blended to prepare SIS/ESIS-based hot-melt pressure sensitive adhesives (HMPSAs). Their compatibility was studied with differential scanning calorimetry (DSC). The adhesive performances of the HMPSAs were measured, including holding power and 180° peel strength. Geniposide was chosen as a representative hydrophilic drug and it’s in vitro release behavior in the HMPSAs was investigated using a modified Franz type horizontal diffusion cells. It was shown that SIS was successfully epoxidized without side reactions. Although the epoxidation impaired the compatibility between ESIS and other additives, the 180° peel strength increased with the epoxidation degrees of ESIS. Furthermore, the in vitro release behavior of hydrophilic drugs was obviously enhanced with the increment of epoxidation degrees.     

MQ硅树脂改性丙烯酸酯压敏胶的研究

采用溶液聚合法将含有乙烯基的MQ硅树脂共聚到丙烯酸酯链节之中,合成了硅树脂改性丙烯酸酯压敏胶。利用FT-IR对改性后的压敏胶进行结构表征,确定了硅树脂的加入时间和最佳用量。结果表明,在聚合反应先期或中期加入10%的硅树脂,制得的压敏胶性能优异。改性丙烯酸酯压敏胶在150℃下持粘性为2200s,室温180°剥离强度为14.5N/25mm,100℃的180°剥离强度为6.3N/25mm,在200℃热老化10h后,剥离强度仍达6.2N/25mm。