乳液压敏胶的耐热耐水性研究

采用预乳化种子聚合工艺,在多元丙烯酸酯中添加自交联功能单体N-羟甲基丙烯酰胺和反应型乳化剂2-丙烯酰胺基-2-甲基-丙基磺酸铵盐,研制出性能优异的耐热耐水型乳液压敏胶。同时讨论了自交联功能单体、反应型乳化剂、种子乳液的用量对压敏性能的影响。     

医用丙烯酸酯乳液压敏胶的研制

叙述了医用丙烯酸酯乳液压敏胶的合成与性能。并且讨论了软、硬单体配比,宫能单体含量及乳化剂用量等因素对压敏胶粘度、快粘力、持粘力、剥离强度等性能的影响。     

丙烯酸酯乳液压敏胶的研制

采用预乳液连续滴加单体的聚合工艺，制成了一种具有较好持粘力、剥离强度的丙烯酸酯乳液压敏胶。探讨了乳化剂种类、乳化剂用量、单体组成等因素对聚合反应及胶粘剂性能的影响。     

外交联型丙烯酸酯乳液压敏胶的制备与性能研究

以丙烯酸丁酯(BA)、醋酸乙烯酯(VAc)、丙烯酸(AA)单体为基础,采用双丙酮丙烯酰胺(DAAM)/己二酸二酰肼(ADH)外交联体系,通过预乳化和半连续加料工艺制备了外交联型丙烯酸酯乳液压敏胶.采用红外光谱(FTIR)、透射电镜(TEM)、热重分析(TGA)等手段对其进行了表征和分析.并研究了软硬单体配比[m(BA)∶m(VAc)]、官能单体(AA)用量及外交联体系(DAAM/ADH)用量对压敏胶性能的影响.结果表明,通过调节软硬单体配比和官能单体用量可以使压敏胶性能达到一个较优的水平.当m(BA)∶m(VAc)=85∶15,w(AA)=3％时,压敏胶初粘力为17号球,180°剥离强度为504 N/m,室温持粘力＞30 d,高温(100℃)持粘力为140 min.外交联体系DAAM/ADH的引入可以在对初粘力和180°剥离强度影响较小的情况下显著提高压敏胶的高温持粘力到540 min,从而得到高温持粘力优异的外交联型丙烯酸酯乳液压敏胶.     

单组分自交联溶剂型丙烯酸酯压敏胶的制备及应用研究

采用了一种自交联功能单体N-羟甲基丙烯酰胺（NMA）,通过自由基聚合方式,制备了一种单组分可自交联无苯溶剂型丙烯酸酯压敏胶。系统研究了自交联单体含量对压敏胶剥离力、黏度、持粘性能和转化率的影响,优选出了NMA最佳使用量。研究结果表明：当自交联单体NMA添加质量分数为0.2%时,压敏胶的剥离力、黏度符合要求,耐温性能优异,65℃高温持粘时间增至10 h,单体转化率较高（达95.2%）。将制得的压敏胶涂布于基材,应用于地毯保护膜,30 d后无翘边现象,且所用溶剂无甲苯,具有环保、低毒优势,证明了本产品具有一定的应用前景。     

外交联型丙烯酸酯乳液压敏胶的制备与性能

以丙烯酸丁酯(BA)、醋酸乙烯酯(VAc)、丙烯酸(AA)单体为基础,采用双丙酮丙烯酰胺(DAAM)/己二酸二酰肼(ADH)外交联体系,通过预乳化和半连续加料工艺制备了外交联型丙烯酸酯乳液压敏胶。采用红外光谱(FTIR)、透射电镜(TEM)、热重分析(TGA)等手段对其进行了表征和分析。并研究了软硬单体配比〔m(BA)∶m(VAc)〕、官能单体(AA)用量及外交联体系(DAAM/ADH)用量对压敏胶性能的影响。结果表明,通过调节软硬单体配比和官能单体用量可以使压敏胶性能达到一个较优的水平。当m(BA)∶m(VAc)=85∶15,w(AA)=3%时,压敏胶初粘力为17号球,180°剥离强度为504 N/m,室温持粘力>30 d,高温(100℃)持粘力为140 min。外交联体系DAAM/ADH的引入可以在对初粘力和180°剥离强度影响较小的情况下显著提高压敏胶的高温持粘力到540 min,从而得到高温持粘力优异的外交联型丙烯酸酯乳液压敏胶。     

保护膜用高初粘低剥离力丙烯酸酯压敏胶的研制

采用丙烯酸异辛酯、特殊丙烯酸酯单体A、丙烯酸、丙烯酸羟乙酯和甲基丙烯酸甲酯为单体,乙酸乙酯、甲苯为溶剂,偶氮二异丁腈为引发剂,制备了保护膜用高初粘、低剥离力溶剂型丙烯酸酯压敏胶。采用单因素试验法探讨了溶剂的类型与配比、引发剂用量、软硬单体配比、功能单体用量、特殊丙烯酸酯单体A的用量、固化剂种类和用量对压敏胶黏度、180°剥离强度及应用性能的影响。研究结果表明:对于保护膜用溶剂型丙烯酸酯压敏胶,通过引入外交联剂,能够显著增大其内聚力。外交联剂类型和用量对压敏胶的剥离强度、初粘性及排气性能均有很大的影响;氨基树脂固化剂在初粘性、排气性能、降低剥离强度方面表现更佳。     

可移除耐高温丙烯酸酯压敏胶的制备及性能研究

以过氧化苯甲酰为引发剂,丙烯酸（AA）、甲基丙烯酸羟乙酯（HEMA）为功能单体,丙烯酸丁酯、丙烯酸异辛酯为软单体,醋酸乙烯为硬单体,采用溶液聚合法制备了一种可移除耐高温丙烯酸酯压敏胶。着重探讨了功能单体用量、软硬单体比例、交联剂种类及用量对压敏胶性能的影响。研究结果表明：功能单体HEMA和AA用量都在2.0%时,压敏胶的耐温性优异,同时剥离力、初粘力符合要求;当软硬单体质量比为90∶10时,压敏胶的剥离力、初粘力、耐温性均符合要求,效果较佳;引入交联剂可显著提高压敏胶的内聚能,赋予压敏胶可移性,当选用异氰酸酯交联剂L-75为1.5%时,压敏胶特性相对最佳。     

自交联丙烯酸酯乳液型压敏胶的制备与性能研究

以丙烯酸丁酯(BA)为软单体、醋酸乙烯酯(VAc)为硬单体、甲基丙烯酸缩水甘油酯(GMA)为自交联单体和丙烯酸(AA)为功能单体,采用预乳化半连续乳液聚合法制备了自交联丙烯酸酯乳液型PSA(压敏胶),并探讨了软/硬单体质量比、引发剂掺量、乳化剂掺量和自交联单体掺量等对PSA粘接性能的影响。研究结果表明:随着GMA掺量的增加,凝胶含量逐渐增大;当m(BA)∶m(VAc)=85∶15、w(AA)=2%、w(引发剂)=0.9%、w(乳化剂)=0.8%和w(GMA)=6%(均相对于软硬单体总质量而言)时,制得的PSA具有相对最好的粘接性能和耐高温性能。     

环保型低剥离力压敏胶的研制

采用半连续乳液聚合法制备了一种丙烯酸类水基型低剥离力压敏胶。主要考察了甲基丙烯酸(MAA)等功能单体和外加交联剂对产物性能的影响。实验表明,随MAA等亲水单体用量的增多,乳液粘度会增大,而引入交联单体在实验范围内可显著降低剥离强度。功能单体用量有一合适范围。选用较高反应活性的氨基树脂作交联剂,可改善耐温性,保持初粘力,得到综合性能较好的低剥离力压敏胶。     

丙烯酸酯乳液型压敏胶的研究进展

综述了聚丙烯酸酯乳液型压敏胶的性能特点以及各种改性方式的研究进展。通过加入增粘树脂、有机硅单体、反应性乳化剂或采用核壳聚合的方式提高其粘接强度,改善耐水性差耐高温性差及涂布干燥等缺点,使聚丙烯酸酯的用途更加广泛。     

丙烯酸酯系水溶性压敏胶的制备及性能研究

以丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)和丙烯酸(AA)为共聚单体,采用半连续乳液聚合工艺,制取了性能优良的丙烯酸酯系水溶性压敏胶(PSA)。讨论了单体、乳化剂、引发剂、反应温度、反应时间和搅拌速率等对该PSA的固含量、黏度、初粘性、持粘性和水溶性等性能的影响。研究结果表明,丙烯酸酯系水溶性PSA的最佳合成工艺条件是:w(引发剂)=0.7%～0.8%、w(乳化剂)=3.0%,搅拌速率为200r/min,反应温度为85～92℃,反应时间为3.5～4h,保温时间为0.5～1h;在此条件下制取的丙烯酸酯系水溶性PSA具有较好的综合性能。     

改性溶剂型聚丙烯酸酯压敏胶的研制

以丙烯酸丁酯(BA)为软单体、丙烯酸甲酯(MA)为硬单体、2-丁酮(MEK)为溶剂和偶氮二异丁腈(AIBN)为引发剂,采用溶液聚合法合成了溶剂型聚丙烯酸酯PSA(压敏胶);然后以交联单体丙烯酸(AA)和丙烯酸羟乙酯(HEA)作为化学交联改性剂、增黏树脂松香作为共混改性剂,考查了各单体用量对PSA综合性能的影响。结果表明:当w(MA)=43.0%、w(AA)=14.0%、w(HEA)=4.9%和w(松香树脂)=18.0%(均相对于BA质量而言)时,PSA胶带的综合性能相对最好,其180°剥离强度为0.917 kN/m、剪切强度为0.651 MPa、初粘力为6#号钢球和持粘力为7.0 h。     

松香衍生物-丙烯酸酯共聚乳液的制备与性能研究

以可自由基聚合的松香衍生物——氢化丙烯酸松香(β-丙烯酰氧基乙基)酯(AHR-2-HEA)作为增黏树脂,采用预乳化半连续乳液聚合法制备了PSA(压敏胶)用基体树脂(松香衍生物-丙烯酸酯共聚乳液)。结果表明:AHR-2-HEA参与了体系的共聚反应,并且其与体系的相容性良好;当w(AHR-2-HEA)=8%时,PSA的综合性能最佳,此时初粘力为10#钢球、180°剥离强度为674 N/m且持粘力超过72 h。     

A novel UV-crosslinked pressure-sensitive adhesive based on photoinitiator-grafted SBS

This report presented a new generation of UV-crosslinking solvent-based pressure-sensitive adhesive (PSA) based on photoinitiator-grafted polystyrene-block-polybutadiene-block-polystyrene (SBS). The SBS, onto which the 4-maleimidobenzophenone (4-MBP) as photoinitiator was grafted, was used as the main component of a PSA. After the UV-crosslinking, a crosslinked structure was formed between polymer chains. FTIR showed that the photoinitiator monomer was successfully grafted onto the hydrophobic polymer. The grafting ratio could be facilely controlled by adjusting the feed amounts of the BPO initiators. The tests of adhesion properties indicated that the 180° peel strength, shear persistent adhesivity and tack property were in the useful range for biomedical applications.     

The effects of substrate surface properties on tack performance of acrylic Pressure-Sensitive Adhesives (PSAs)

The effects of substrate surface free energy (SFE) and substrate roughness on tack performance of adhesive tapes containing synthesized model acrylic pressure-sensitive adhesive (PSA) have been investigated. In order to study the influence of substrate SFE on tack the adherents with the same surface roughness (expressed by selected amplitude parameters) were used: PTFE, PP, PE, ABS, PC, PMMA, stainless steel and glass. The relationship between substrate roughness and tack was investigated using two polypropylene plates (PP and PP_rough) characterized as having the same wettability (SFE). For tack determination the most common method in the PSA tapes industry was employed (loop tack test). The conducted experiments showed that substrate SFE is a crucial factor governing tack properties of acrylic PSAs. In general, a larger difference between the SFE values of the substrate and adhesive were correlated with greater tack values. The dependence of tack and SFE was significantly influenced by crosslinking degree and layer coat weight of model acrylic PSA. The experiments carried out in the second part of the study revealed that the adhesive׳s viscoelastic properties control the tack properties on rough substrates, however, the final tack performance was found to be strongly affected by the level of substrate roughness and PSA thickness.     

微球型丙烯酸酯压敏胶的制备研究

采用悬浮聚合法制备了微球型丙烯酸压敏胶,以丙烯酸酯类单体为主体,在含有分散剂的水相中采用悬浮聚合的方法制备了粒径为10-100μm黏性聚合物微球.使用这种微球富集相按照一定比例调配自制的乳液,增稠剂及其他添加剂制得的压敏胶液用线棒涂布器涂布于纸等基材上烘干即得具有良好再剥离性的反复粘贴压敏胶.在吸取前人的经验并通过大量...     

Mapping the tack of the pressure-sensitive adhesive joint vs. applied stress and age

A tacky elastomer, the pressure-sensitive adhesive spontaneously bonds with a solid on contact to form a load-bearing pressure-sensitive adhesive joint (PSAJ) that makes many manufactured goods. While the property called the tack of the PSAJ, measured by the green strength of the joint at low applied stress, is vigilantly monitored for quality assurance, it harbors considerable indefinitude because it increases with applied stress and age to span a continuous spectrum that no finite number of discrete empirical readings can fully cover. Assuming the joint strength to be proportional to adhesive/substrate contact area on the atomic level, and treating the contact process as atomic-scale creep, this work determines from first principles the measured tack of a given PSAJ as a function of applied stress and age. The quantitative structure of the function and its implications are explored. The result is tested with published empirical data and used as a basis for mapping the tack spectrum from discrete readings. It brings settlement of long-standing issues such as ranking PSAJs by their non-corresponding tack readings, explaining the disconcertingly high noise : signal ratios plaguing tack data, buffering the uncertainty and extending the domain of tack measurement. It also shows that the tack and the mature joint strength constitute one smooth continuous spectrum.     

脲基功能单体对丙烯酸酯PSA乳液性能的影响

以丙烯酸酯类单体为主要原料,将脲基功能单体[MAEEU(甲基丙烯酰胺乙基乙撑脲)]和DAAM(双丙酮丙烯酰胺)引入体系中,采用半连续乳液聚合法制备改性丙烯酸酯PSA(压敏胶)乳液。研究结果表明:MAEEU在乳液聚合后期加入且w(MAEEU)=3%时,PSA乳液的综合性能(如初粘力、持粘力、剥离强度和耐水性等)相对最好;此时PSA的Tg(玻璃化转变温度)从-36.47℃升至-8.95℃,说明在乳液成膜过程中MAEEU和DAAM可发生交联反应,并且交联效果明显;脲基功能单体的使用为提高乳液型PSA性能的研究提供了新的方法 。     

Preparation of an adhesive in emulsion for maxillofacial prosthetic

Maxillofacial prostheses is a dental medicine specialty aimed at restoring anatomical facial defects caused by cancer, trauma or congenital malformations through an artificial device, which is commonly attached to the skin with the help of an adhesive. The purpose of our research was to develop a pressure-sensitive adhesive (PSA) based on acrylic monomers, characterizing and determining its drying kinetics, that is to say the time it takes to lose 50 to 90% of its moisture. The adhesive synthesis was realized by means of emulsion polymerization; the composition of formulations was: (AA-MMA-EA) and (AA-MMA-2EHA) with different molar ratios. The formulation based on (AA-MMA-2EHA) with 50 w% of solids, presented good adhesive properties such as tack, bond strength, and short drying time. We propose this formulation as a PSA, because it offers an alternative for systemically compromised patients, by less irritation compared to organic solvent-based adhesives.