Effects of CeS and CoO·Al2O3 on regulation of red/blue light quality and performance of polyethylene shed film
Red/blue light quality controlled polyethylene(PE)shed film has been an urgent problem in the agricultural film industry.Cerium red(CeS)and cobalt blue(CoO·Al2O3)were introduced into PE to prepare PE red/blue light shed film by blow molding process.The testing results of photoelectric fog meter show that CeS and CoO·Al2O3 have little effect on the light transmit-tance of PE shed film,but the haze and astigmatism increase.The testing results of fiber optic spectrometer and handheld spectral illumination meter show that CeS and CoO·Al2O3 significantly improve the blue light transmittance of 450-520 nm and the red light transmittance of 605-700 nm,and when the mass ratio of CeS and CoO·Al2O3 is 1∶2,the red light transmittance is 39.2%,the blue light transmittance is 38.1%,and the red/blue light transmittance ratio is 1.03.The testing results of universal tensile testing machine show that CeS and CoO·Al2O3 could improve the mechanical properties of PE shed film compared with blank samples,among which the tensile strength is increased by about 5.5%,the elongation at break is increased by about 16.8%,the right angle tearing strength is increased by about 3%,and the puncture strength is increased by about 21.8%.The testing results of differential scanning calorimeter show that the addition of CeS and CoO·Al2O3 could improve the oxidation induction period of PE by more than 45 min,and PE has good heat stability.The above testing results show that the introduction of CeS and CoO·Al2O3 can significantly improve the astigmatism performance,mechanical properties,thermal aging resistance,red/blue light transmittance and transmittance ratio of PE shed film.In addition,PE functional shed films with different red/blue quality regulation can be obtained by adjusting the mass ratio of CeS and CoO·Al2O3.
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