A sufficient amount of an antioxidant or anti-aging masterbatch is applied to the modified plastic in order to provide it high weather resistance. Following testing, the test item is exposed to UV light from a xenon lamp for 1000 hours, or one year. Retention of tensile strength was 86%, and strength was 88%.
The plastic has a long life cycle, which lessens the influence of waste plastic on the environment's pollution. Xenon lamp UV radiation for 3000h, or three years, retains 74% of its impact strength and 71% of its tensile strength, respectively.
Modified polypropylene plastic's invention:
The use of toughener
El polipropileno, uno de los cinco plásticos de uso general, tiene un uso limitado en plásticos de ingeniería y materiales estructurales debido a su importante tasa de reducción de moldeo y a su rápido alabeo y distorsión. El sistema se refuerza, se ajusta y se le añade carbonato cálcico. El material compuesto puede alcanzar una variedad de cualidades mecánicas típicas a la vez que es menos costoso, lo que aumenta la gama de usos del polipropileno.
caustic calcium carbonate activation
With the growing growth of the composite material sector, toughener producers have discovered that calcium carbonate serves as both a filler and a significant modifier. Calcium carbonate may be added to the polypropylene blending modification system to increase stiffness and heat resistance while lowering the rate of molding shrinkage and product raw material costs.
The toughening agent manufacturers advise using heavy calcium carbonate with a mesh size of 1000 or more, and putting it into a high-speed agitator after drying, the calcium carbonate is an inorganic filler and has poor compatibility with polypropylene, so activation treatment is required before use to improve the binding force between calcium carbonate and polymer molecular chains, improve the mechanical properties of filled polypropylene materials, and increase the
The impact strength of the system in the blending system grows fast at initially, increases slowly after 30 parts, and falls after 40 parts as the amount of activated calcium carbonate increases. The coupling agent can increase the impact of the substance by activating the calcium carbonate. Because the activated calcium carbonate particle surface's physical and chemical characteristics have altered and are now simpler to distribute in the matrix, the strength has increased. There will be an aggregation and buildup of inorganic particles when the calcium carbonate content surpasses a particular threshold, making the blending method ineffective. The structure develops internal flaws, which cause a deterioration in a number of mechanical qualities.Calcium carbonate dose should thus not be greater than 40 parts.
Effect of Toughener on Blending System
(1) PP is given exceptional toughness and good processability by using a toughening agent.
(2) The chemical structure of the toughening agent, which has high aging resistance, has no unsaturated double bonds.
(3) El agente endurecedor es fluido y compatible con las poliolefinas, y tiene una distribución de peso molecular estrecha.
(4) Tanto la resistencia de la línea de soldadura de un producto como el impacto de la dispersión de las cargas pueden mejorarse con una buena fluidez.
The impact strength and elongation at break of the system are significantly increased with the addition of toughener.
As can be shown, PP and activated calcium carbonate are compatible with the toughening agent, which also has a good toughening effect on PP. This is due to the narrow molecular weight distribution of the toughening agent and the longer side octyl group than the side ethyl group in the molecular structure, which can form a molecular connection point and function as a connection and buffer between the components, allowing the system to function when it is impacted. As impact energy is distributed and buffered, there is less chance that stress-induced crazes will turn into fractures, increasing the system's impact resistance.
La estructura de red generada por estos puntos de conexión puede experimentar una deformación sustancial mientras el sistema está bajo tensión, lo que provoca un aumento significativo del alargamiento de rotura del sistema. Dado que el rendimiento del propio agente endurecedor determina la resistencia a la tracción, la resistencia a la flexión y el módulo de flexión del sistema, cuando aumenta el contenido del agente endurecedor, éste debe mantenerse por debajo de 20%.
