Pharmaceutical packaging adhesive

There are two main types of drug packaging adhesive, pressure sensitive adhesive and polyurethane adhesive. 1, pressure-sensitive adhesive, pressure sensitive adhesive is suitable for the base material with paper and plastic film, such as PVC, polyethylene, polypropylene, polyester, polytetrafluoroethylene, and polyimide, cellulose acetate, etc. Metals such as aluminum foil and copper foil, lead foil, etc. The main components of the pressure sensitive adhesive including synthetic resin adhesive ( Including natural rubber, synthetic rubber, cellulose, poly (acrylic acid esters) Fu, viscosity, Rosin and rosin ester, all kinds of petroleum resin, epoxy resin and phenolic resin) , plasticizer ( Chlorinated paraffin, phthalate) , protective agent, stabilizer, crosslinking agent, colorant and packing, etc. Early drug packaging of pressure sensitive adhesive is based on natural rubber as main ingredient, its formula is classics plasticate natural rubber 100, poly pinene resins ( Melting point 70 ℃) 75, petroleum resin and part of polymerization in May of trimethyl two chloroquine Lin 2 copies. Another formula is refined by the plastic smoke 100 pieces of rubber, zinc oxide 50, hydrogenated rosin, 75, and a small amount of tackifier, plasticizer. Later with synthetic rubber, synthetic resin instead of the natural rubber, the application of acrylic ester and its copolymers are most common, such as propylene acid copolymer emulsion of high strength pressure sensitive adhesive and its ratio of manufacturing method is to put 100 43% solid content of butyl acrylate & ndash; Acrylic 2 & ndash; Ethyl caproic ester & ndash; Vinyl acetate copolymer emulsion ( Composition ratio is thus: 33) With 30 to 50% solid content of ethylene & ndash; Vinyl acetate & ndash; Vinyl chloride copolymer emulsion ( Composition than 19:36:45) Mix, besmear on polypropylene film treated by corona discharge, under the condition of 110 ℃ for 1 minute, drying is made into pressure sensitive adhesive tape. This kind of adhesive tape peel strength of stainless steel is 600 g / 25 mm. With increasing health performance requirements for pharmaceutical packaging materials, the ratio of natural rubber adhesive joining additives is faulty, some toxicity, has not used in packing food compound drugs. But class acrylate pressure-sensitive adhesive are still has some advantages, such as being one-component, not crosslinking curing, need not glue, simple to use, not out of adhesive solution overnight or longer also can't bad, as long as not leak sealed preservation. And glued surfaces condition is good, a lot of non-polar materials such as plastic, metal materials, small surface tension can also be glued down. But because there are so many types in composite drug packaging materials, companies have turned to a two-component polyurethane adhesive, used in polarity plastic composite materials and non-polar materials. 2 there is a high degree of elastic polyurethane adhesive, pu adhesive, compared with other flexible adhesive, has better heat resistance, solvent resistance, cold resistance, chemical resistance, resistance to oxidation and ozone resistance and other properties. To metal, plastic, wood, rubber, fabric has good affinity, so the application is very extensive, especially widely used in the field of medicine, food packaging. Most used in plastic and plastic composite, metal and plastic composite, blister packaging of hot pressing, etc. Polyurethane adhesive for the earliest application was in the 1960 s, when food composite packaging just listed, used as a binder, mainly according to its composition is divided into many different isocyanate, carbamate prepolymer, isocyanate modified polymer three categories. (1) more isocyanate usually use triphenylmethane P— Three isocyanates, six methyl diisocyanate, diphenyl methane - 4, 4 - toluene diisocyanate or diisocyanate, etc. , these much less isocyanate used alone, mainly as crosslinking agent of rubber adhesive, or as a polyester and polyether type curing agent of polyhydroxy compounds. With its use of polymer and polyacrylate resin, epoxy resin, dimethylbenzene, poly phenol amine resin, etc. (2) urethane prepolymer is it part of isocyanate and polyol reaction products, because of the polymer end group of NCO group, can be solidified in the presence of proper curing agent, can also through the air humidity and curing, made into one-component adhesive. (3) department of isocyanate modified polymer by diisocyanate and difunctional more polyester or polyether reaction, on the base of hydroxyl linear polymer, also known as thermoplastic polymer. According to the dosage form, polyurethane adhesive could be divided into two types: one-component and bicomponent, from the bonding strength of the latter than the former. A two-component A component is mainly isocyanate modified polymer, team B is also has introduced carbamate prepolymer. The polyol mainly castor oil or polyethylene glycol (peg). One-component can be divided into two kinds, one kind of direct use of two-component A component, namely different amino acid ester modified polymer; Another kind is diisocyanate and ethylene glycol of carbamic acid ester, acid with ethylene glycol this kind of short chain compounds inherent good adhesive performance.
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