In recent years, China, the European Union and other countries and regions have clearly pointed out that the production, sales and usage of some plastic products are prohibited and restricted in terms of further strengthening the control of plastic pollution. It mentioned about disposable plastic tableware, which led to the transformation of PLA (Polylactic acid) instead of PP (polypropylene).
Due to the material properties, the heat distortion temperature of polylactic acid is between 50°C ~ 60°C, while the heat distortion temperature of polypropylene is above 100°C. Therefore, in the direction of hot drinks, there is still a big gap between the conventional pure polylactic acid material and polypropylene material in terms of temperature resistance.
The current industry practices include blending modification method and crystallization post-treatment method.
1. Blending modification method: Accept other biodegradable materials with high heat distortion temperature, such as polybutylene succinate, whose heat distortion temperature is about 93°C, and through a certain proportion of blending, the overall Increase the heat deflection temperature of the mixture.
Disadvantages: As one of the raw materials, polybutylene succinate not only has low output, high price, but also has food safety risks. After adding polybutylene succinate, it still cannot fully meet the temperature requirements of hot milk tea.
2. Crystallization post-treatment method: Accept the form of crystallization post-treatment, and bake the polylactic acid straw, which can improve the crystallization of the polylactic acid straw.
Crystallinity, which ultimately increases the heat deflection temperature of the straw. Its process route is: extrusion, cutting, and drying process.
Disadvantages: The qualified rate of straws after drying tunnel treatment is reduced. The mass production process of straws is no longer coherent, and the process of drying tunnel treatment is virtually increased, resulting in low production efficiency.
iSuoChem Group, as one of the most important polylactic acid materials and polylactic acid products suppliers, has provided a preparation method of polylactic acid heat-resistant straws, which can solve the problem of low thermal deformation temperature of polylactic acid straws and reduce the equipment's impact on polylactic acid materials. Performance requirements and production costs to improve food safety.
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