Guangzhou Rosin Packaging Co., Ltd. has developed an injection grade low precipitation, low-temperature resistant recycled PP material using food grade recycled polypropylene as raw material, through three-stage heat treatment and low-temperature blending modification technology. This material has passed FDA, ROHS, REACH contact safety testing and has an impact strength of over 3 kJ/m ² at -15 ℃, far exceeding that of homopolymer PP-H raw materials. It completely solves the problem of unstable adhesion during secondary processing and provides a high-performance solution for the low-carbon transformation of the daily chemical packaging industry.

Industry pain points: Dual constraints of low-temperature brittleness and precipitation issues

In the field of plastic packaging and products, homopolymer polypropylene occupies an important position due to its excellent hardness and transparency, and is widely used in packaging scenarios such as food, daily chemical, pharmaceutical, etc. However, its low-temperature brittleness issues constrain its application boundaries. When the ambient temperature drops from 23 ℃ to 0 ℃, the notch impact strength of PP-H cantilever beam sharply decreases from about 3 kJ/m ² to 1.5 kJ/m ², and further drops to 0.7 kJ/m ² at -15 ℃. This performance cliff makes PP-H products prone to cracking in winter, which not only affects the user experience but also increases the external packaging and after-sales costs of the enterprise.

Polypropylene materials also commonly face the problem of precipitation. Residual small molecule substances such as ethylene monomers, lubricants, and release agents in raw materials will migrate to the surface of the product over time, seriously affecting the adhesion of secondary processing such as spraying, electroplating, printing, and hot stamping. Many companies have encountered the embarrassing situation of good adhesion during the initial spraying stage, but failure in the hundred grid test after one month of storage. What is even more troubling is that the differences in precipitation tables between different petrochemical grades or even different batches of the same grade seriously interfere with production stability and quality control consistency.