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At present, the two official polyurethane resins on the market generally have excellent flexibility, low volume shrinkage, but the curing speed is slow, in practical applications easily lead to poor system curing or narrow construction window problems. UT70135 is specially developed for this problem, two-function polyurethane acrylic, mainly used in UV glue, methyl adhesive system.
test formula uses resin with a small amount of monomer, moderate amount of trigger, mainly to investigate the resin curing speed, retouching, flexibility, initial yellowing and other properties . Experiments show that UT70135 has the following characteristics.
1
scale fast curing
compared with traditional two-function polyurethane acrylic, the UT70135 curing speed is very fast, at 200mJ/cm
2
energy can be dried, and has a good cross-link density, low volume shrinkage. The resin is ideal for low-energy curing systems, and with a small amount of high-energy resins or monobodies can further increase cross-link density and enhance deep curing.
2
flexible
UT70135 main chain for the polyether structure, so has excellent flexibility, on the PC film 180 degrees fold many times, paint film does not crack. Through universal tensile machine testing, the resin elongate rate of up to 100%, tensile strength of 12Mpa, with good cohesion and tensile strength, used in adhesive formulation, can take into account flexibility and reactive activity.
3
retouchingUT70135 has excellent pigment wetting, strong coloring force, good color display. When used in meth adhesive, and color slurry compatible is good, there will be no pigment analysis, flocculation and other adverse conditions. At the same time, the resin has a good initial yellow change, in the white color glue is not easy to cause yellowing problems.
4
low irritation
in many applications and construction, especially adhesive system, the smell and irritation of raw materials have higher requirements. UT70135 molecular weight is medium, low volatility, small odor, small skin irritation, can fully meet the construction application of odor and irritation requirements.
