Low temperature hot melt adhesive Po in Hong Kong in China what progress


Low temperature hot melt adhesive Po in Hong Kong in China what progress
Hong Po low-temperature hot melt pressure sensitive adhesive is to heat plastic elastomer as matrix resin, by the addition of tackifying resin, the plasticizing agent, antioxidant and other additives mixed melting into a kind of solvent free adhesive. The use of traditional hot melt pressure sensitive adhesive temperature usually between 160-180 Deg. C, under these conditions, the operation, not only consumes a large amount of electrical energy (is not conducive to saving energy and reducing consumption), and significantly reduce the service life of the coating machine; and it is very easy to make health activities of substrate cast film (polyethylene film) there was a hot wrinkle, hot to break phenomenon, adhesives is also easy to be aged and decomposition, coking and clogging pipes and spraying nozzle etc., thus workers on the operation safety requirements greatly increased.
Type low temperature hot melt pressure sensitive adhesive use at temperatures below 140 DEG C, the under lower temperature than the traditional hot melt pressure sensitive adhesive has lower melt viscosity, more effectively infiltration cotton core, the energy consumption is low and not easy to hot broken material characteristics, so as to reduce the residual odor health activities, and has a high degree of freedom to choose lower cost raw materials.
Type low temperature hot melt pressure sensitive adhesive development is currently mainly concentrated in the physical modification, proceed from the basic raw material formula, change the original traditional elastomer and tackifying resin system, or the introduction of structure similar, and the elastic body has the good compatibility of material (such as viscosity adjusting agent, ionomer resin, etc.), the coating technology from the traditional high temperature operation transformation for low temperature operation.
Viscosity modifier modification
Viscosity modifier modification is to improve the mobility of adhesive by adding viscosity modifier in hot melt pressure sensitive adhesive. Generally, the viscosity modifier is a wax - like substance (such as wax, microcrystalline wax, synthetic wax, etc):
Can reduce the melt viscosity of hot melt pressure sensitive adhesive and improve its mobility.
The improved creep resistance, flexibility, reduce wire drawing.
Reduce the production cost of hot melt pressure sensitive adhesive.
The wax material addition will have a negative impact on the adhesive cohesive strength and adhesion strength. Paraffin is a mixture of carbon atoms between 22-36 n-paraffin compositions, the characterization of the nature of the main parameters are the degree of crystallinity, relative molecular weight and its distribution of the, when the relative molecular mass of paraffin increased to a certain value, the paraffin and elastic experience appear incompatible phenomenon, thus the occurrence of phase separation, and then leads to a decrease in the adhesive strength and tensile strength.
Microcrystalline wax for C31 more branched chain saturated hydrocarbons, cyclic hydrocarbons and straight chain hydrocarbons such as composition mixture; synthetic wax is generally various low molecular polyethylene, polypropylene and alpha olefin. Generally the melting point of the wax like substance in 50 to 90 DEG C, and Hong Po low-temperature hot melt pressure sensitive adhesive thermal plastic elastomer has very good compatibility.
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