Optically variable highly transparent polypropylene resin and preparation method thereof

Abstract

The invention relates to an optically discolorable high-transparency polypropylene resin and a preparation method thereof. The preparation method is: mixing the components according to the formula ratio and then melt-extruding to obtain an optically discolorable highly transparent polypropylene resin. The preparation process of the surface-treated color-changing pigment is as follows: firstly, pre-mix the color-changing pigment with long-chain alkyl modified silicone oil, then add zirconia to continue mixing, pour the mixture into an ultrasonic vibrating sieve and repeat ultrasonic sieving, and finally pour the mixture into the mixture The long-chain alkyl modified silicone oil is added for final mixing; the prepared optically variable high-transparency polypropylene resin includes polypropylene and surface-treated color-changing pigments, and the color-changing pigments are temperature-sensitive color-changing pigments. The preparation method of the optically discolorable highly transparent polypropylene resin of the present invention is simple and easy, and the cost is low; the prepared resin maintains stable transparency and discoloration hue consistency under continuous high-temperature lighting conditions.

Description

technical field [0001] The invention belongs to the technical field of polypropylene composite materials, and relates to an optically discolorable highly transparent polypropylene resin and a preparation method thereof. Background technique [0002] Due to the shortage of polycarbonate (PC) raw material sources and the high price of raw materials, especially the roller coaster price increase trend since 2018, it has caused heavy damage to downstream lighting companies. Turning to polypropylene (PP) materials, using PP instead of traditional PC materials in the field of LED lamps, can reduce the cost of raw materials by 40% for downstream lamp customers. Compared with PC resin, another advantage of PP is the processing window of materials Wide, but PP is an easy-to-crystallize polymer, and the transparency of unmodified or conventional crystal-modified PP is far inferior to that of PC. Moreover, PP’s heat and oxygen aging resistance is not as good as that of PC. These two tec...

AI Technical Summary

Problems solved by technology

[0002] Due to the shortage of polycarbonate (PC) raw material sources and the high price of raw materials, especially the roller coaster price increase trend since 2018, it has caused heavy damage to downstream lighting companies. Turning to polypropylene (PP) materials, using PP instead of traditional PC materials in the field of LED lamps, can reduce the cost of raw materials by 40% for downstream lamp customers. Compared with PC resin, another advantage of PP is the processing window of materials Wide, but PP is an easy-to-crystallize polymer, and the transparency of unmodified or conventional crystal-modified PP is far inferior to that of PC. Moreover, PP’s heat and oxygen aging resistance is not as good as that of PC. These two technical problems severely limit the use of PP materials. Applications in the field of optics

[0003] The prior art patent CN107652620A discloses a packaging material with temperature-sensitive discoloration ability, which is composed of temperature-sensitive color-changing powder, heat stabilizer, antioxidant, dispersant, and substrate. Although it has temperature-sensitive discoloration performance, it is sensitive to temperature The addition of color-changing powder has a negative impact on the high transparency of polypropylene materials, and under the long-term lighting environment of LEDs, conventional temperature-sensitive color-changing additives (organic materials) will migrate out slowly and cause the color-changing function to fail. Appearance problems such as photothermal aging lead to yellowing and chalking, resulting in reduced transparency