Maleic anhydride grafted polypropylene preparation method

Abstract

The invention discloses a maleic anhydride grafted polypropylene preparation method, which comprises: uniformly mixing maleic anhydride, an activator and polypropylene powder in a high-speed mixer; and feeding into a multifunctional rubber-plastic processing device, and carrying out a grafting reaction on the maleic anhydride and the polypropylene powder under the co-action of microwaves and the activator to prepare the maleic anhydride grafted polypropylene. According to the present invention, by introducing the activator, the microwave reaction efficiency is promoted, and the grafting ratioof the maleic anhydride grafted polypropylene is increased, such that the compatibility, the toughness and the impact strength of the maleic anhydride grafted polypropylene product are substantially improved.

Description

technical field [0001] The invention relates to the technical field of graft modification of polymer materials, in particular to a preparation method of maleic anhydride grafted polypropylene. Background technique [0002] Polypropylene plastic has become one of the most promising thermoplastic polymer materials due to its excellent mechanical properties, chemical corrosion resistance, good electrical insulation, and easy processing and molding, but it is easy to oxidize, has poor low-temperature strength, and is flammable. , poor low temperature toughness and many other shortcomings limit its further application. [0003] Graft modification of polypropylene plastic is the main way to expand its application field. Polypropylene plastic is a non-polar polymer, and the fillers used for modification, such as glass fiber, flame retardants, minerals, etc., have high polarity. When the plastic is physically blended with these fillers, the two have little force. , it is necessary...

AI Technical Summary

Problems solved by technology

The main problem that exists is that the grafting rate of polypropylene grafted maleic anhydride monomer is low, and the second monomer styrene is also added to improve the grafting rate of maleic anhydride monomer. Under the action of the chain, the chain will be partially broken, resulting in a significant increase in the fluidity of the material, a decrease in impact resistance, and a deterioration of the matrix performance. Therefore, a third multifunctional monomer is often added to cross-link to increase the molecular weight and impact resistance. The method is often not ideal for improving the compatibility of polypropylene plastics with other fillers and the impact of materials due to the uneven mixing of multiple monomers and the probability effect of crosslinking reactions.

[0005] The traditional method has complex process, high energy consumption, large investment in equipment, and relatively high production cost, which is not economical and reasonable.