卫生用品用热熔压敏胶的研制及影响因素探讨
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摘要
热熔压敏胶(HMPSA)在卫生用品应用中质量不稳定、返胶等问题影响着其质量安全,因此其产品质量保障也就尤为突出。
     本文进行了增粘树脂的差异性研究及热熔压敏胶的各影响因素分析。结果表明,增粘树脂性能差异性常导致热熔压敏胶性能存在差异性,软化点为100~110℃,用量为弹性体的210%为宜;含萜烯树脂的HMPSA比含松香树脂的HMPSA表现出更好的粘结强度,含石油树脂的HMPSA略差。胶体熔融粘度随SBS用量增大而增大,随增塑剂用量增大而降低;180o剥离强度随SBS用量增大先增强后减弱,用量为15~22%时最大,随增塑剂用量增大而减弱;初粘力随增塑剂用量增大而增强,持粘力则相反,在较窄范围内,SBS对初粘力影响较小。
     本文还尝试了低温型HMPSA的开发及影响因素探讨。研究发现,SIS中苯乙烯含量以>20%,SBS与SIS以1:1共混为宜。萜烯酚树脂(TSR-901)与聚α-甲基苯乙烯树脂(SA-120)以10:6共混为宜;苯乙烯/α-甲苯基乙烯/脂肪族共树脂(ST-080)与萜烯-苯乙烯树脂(MST-100)以10:3~6:7共混为宜,为低温型HMPSA的优选芳香族树脂。石蜡和乙烯-丙烯酸丁酯能降低了胶体的透明度和内强度。
     根据实验研究结果,对合作企业生产设备进行了改进,将研制的配方与工艺进行了中试,其热熔压敏胶产品及卫生用品经检验合格,正式投放市场。
Many quality problems of hot-melt pressure-sensitive adhesive (HMPSA) such as unstable quality or recurrent adhesive restrict the quality and safety of disposable articles in the market, so the quality guarantee of HMPSA used disposable articles has been particularly outstanding.
     The differences studying of tackifier resins and the analysis of influencing factors of HMPSA were studied firstly in this paper. The result was such that the effects of HMPSA properties were affected by the differences of tackifier resins. The general properties of HMPSA were got the best when the softening point of tackifier resin was from 100 to 110℃and the content of tackifier resins for the thermoplastic elastomer was 210%. The adhesive strength of HMPSA was got by terpene resins better than rosin resins, the properties of HMPSA when containing petroleum resins were inferior to containing other types of tackifier resins in HMPSA. Melt viscosity decreased as the content of SBS increased and reduced as the content of plasticizer increased; 180opeel strength strengthened as the content of SBS increased and then weakened sharply, and reached its maximum when the SBS content was from 15% to 22% and declined as the content of plasticizer increased; The ball tack strengthened and the holding power weakened as the content of plasticizer increased, the ball tack was been little affected by elastomer content in a short range.
     The new low application temperature HMPSA was preparaed and the analysis of influencing factors for these adhesives were also studied. This study demonstrated that it was a appropriate choice that the styrene content in elastomer SIS greater than 20%, the maximum 180o peel strength was got when SBS and SIS blending ratio was 1:1. Satisfactory results could be shown when the blending ratio was 10:6 between terpene phenol resin (TSR-901) and poly-α-methyl styrene resin (SA-120); Resins consists of polystyrene/poly-α-methyl-styrene /aliphatic copolymers (ST-080) and terpenes-styrene resin (MST-100) was the best choice firstly that the blending ratio was from 10:3 to 6:7. The transparency and cohesive strength of HMPSA reduced when the paraffin wax and polyethylene-butyl acrylate added.
     According to the results of laboratory studies, the production facilities were improved and the improvement formulas and preparation process were completed a series of pilot with the cooperation enterprise, the HMPSA products and sanitary napkins were checked by different analysis methods, and last put into the market.
引文
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