Preparations Of Hot-melt Pressure-sensitive Adhesive For Disposable Articles And Study The Effects Of The Influencing Factors

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.