耐温抗老化型丙烯酸酯压敏胶的制备及性能研究
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TB324;TQ436+.3

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Preparation and Properties of Temperature-Resistant and Anti-Aging Acrylate Pressure-Sensitive Adhesives
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    摘要:

    针对家电标签用丙烯酸酯压敏胶存在起泡、黄变、冷脆失黏等失效问题,通过分子设计,以丙烯酸-2-乙基己酯(2-EHA)和丙烯酸丁酯(BA)为软单体,丙烯酸甲酯(MA)和醋酸乙烯酯(VAc)为硬单体,丙烯酸(AA)和丙烯酸脲酯(WAM-X)为功能单体,乙酸乙酯为溶剂,过氧化苯甲酰(BPO)为引发剂,经自由基溶液聚合、添加交联剂和抗氧剂,制备了一种耐温抗老化型溶剂丙烯酸酯压敏胶。考察了加料工艺、单体配比、引发剂和交联剂用量等对压敏胶黏接性能的影响,并研究抗氧剂对压敏胶耐黄变老化性能的影响。采用流变仪和可见分光光度计分别测定了压敏胶的黏弹性及透光率。结果表明,当软硬单体质量分数为90%(软硬单体质量比为10:1),BA与2-EHA、及MA与VAc的质量比都为1:1,功能单体AA与WAM-X的质量分数分别为9.8%和0.2%,引发剂用量为总单体质量的0.5%,乙酰丙酮铝和抗氧剂Deox S80用量分别为总单体质量的0.5%和0.15%时,所制备的压敏胶表现出优异的综合性能。该压敏胶室温下初黏性为11#钢球,剥离强度大于25 N/25 mm,持黏时间超过100 h;在80 ℃下持黏超过24 h无滑移;且经冷热交变后,未出现黄变和冷脆现象,展现出良好的抗老化性能,满足家电标签严苛工况要求。

    Abstract:

    Aiming at the failure problems such as blistering, yellowing, cold brittleness and loss of adhesion of acrylate pressure-sensitive adhesives for home appliance labels, through molecular design, a temperature-resistant and anti-aging solvent acrylate pressure-sensitive adhesive was prepared by free radical solution polymerization with acrylic acid-2-ethylhexyl ester (2-EHA) and butyl acrylate (BA) as the soft monomers, methyl acrylate (MA) and vinyl acetate (VAc) as the hard monomers, acrylic acid (AA) and urethane acrylate (WAM-X) as the functional monomers, ethyl acetate as the solvent, and benzoyl peroxide (BPO) as initiator, with the addition of crosslinking agent and antioxidants. The effects of feeding process, monomer ratio, initiator and crosslinking agent dosage on the adhesive properties of the pressure-sensitive adhesive were investigated, and the effects of antioxidant on the yellowing and aging resistant properties of the pressure-sensitive adhesive were also studied. The viscoelasticity and transmittance of the pressure-sensitive adhesives were determined by rheometer and visible spectrophotometer, respectively. The results showed that when the mass fraction of soft and hard monomers was 90% (the mass ratio of soft and hard monomers was 10:1), the mass ratios of BA to 2-EHA and MA to VAc were both 1:1, the mass fractions of functional monomers AA and WAM-X were 9.8% and 0.2%, respectively, the amount of initiator was 0.5% of the total monomer mass, and the amounts of aluminum acetylacetonate and antioxidant Deox S80 were 0.5% and 0.15% of the total monomer mass, respectively, the prepared pressure-sensitive adhesives showed excellent comprehensive performance. The initial adhesion at room temperature was that of 11# steel ball, peel strength was more than 25 N/25 mm, and the holding time exceeded 100 h. It kept the holding adhesion for more than 24 h at 80 ℃without slippage. Moreover, after alternating between hot and cold, no yellowing and cold brittleness occurred, showing good anti-aging performance and meeting the harsh working conditions required for home appliance labeling.

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马 宁,张玉辉,倪华钢,戴志锋,叶 鹏,汤志柯.耐温抗老化型丙烯酸酯压敏胶的制备及性能研究[J].包装学报,2025,17(4):76-85.

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  • 在线发布日期: 2025-07-14
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