High-glaze strengthened toughened polyethylene glycol terephthalate nanometer composite material and preparation thereof

Abstract

The invention relates to a high-gloss enhanced PET toughening composite material, which has the following components based on weight proportion: 100 portions of PET, 0.5-5.0 portions of modified nano-intensifier, 0.1-10 portions of nucleating acceleant, 5.0-25 portions of toughener, 10-45 portions of glass fibers, 0.1-1.0 portion of chain extender, 0.1-0.5 portion of antioxidant and 0.3-0.5 portion of lubricant. The preparation method is that the components are evenly mixed on a high-speed mixer and melted and blended by a twin-screw extruder to prepare the composite material. The composite material has the advantages of fast crystallization rate, high gloss and good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of modification of engineering plastics, in particular to a high-gloss reinforced and toughened polyethylene terephthalate (PET) nanocomposite material and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is a thermoplastic engineering plastic with excellent mechanical properties, electrical insulation, heat resistance and chemical resistance, so it is widely used in the fields of fibers, films and beverage bottles. Due to the slow crystallization rate of PET at the commonly used processing mold temperature, resulting in imperfect and uneven crystallization, the molding cycle is prolonged, and the product is easy to adhere to the mold, and has warping, rough surface, and durability. The disadvantages of poor impact resistance and moisture resistance severely limit its development in the field of engineering plastics. The key issue of PET engineering is how to incr...

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Problems solved by technology

For example, the patent TW583265B has developed a high-gloss PET nano-polyester made of uniformly dispersed silicate clay, but the layered silicate needs to be expanded with an alcohol solution containing protonic acid and intercalating agent to prepare The process is complex and the production cost is high; US4551485 uses sodium stearate as a nucleating agent to greatly increase the crystallization rate of PET, but the nucleating agent reacts with PET molecular chains at high temperatures to form chemical nucleation, which is easy to cause PET degradation, especially during processing, reduces molecular weight and affects mechanical strength (sodium benzoate and magnesium stearate cause similar problems); non-alkali metal hydroxides such as Al(OH) 3 It has better nucleation effect in the melt crystallization process of PET, Al(OH) 3 Through dehydration, adjacent molecules are supercooled and nucleated, and the released water degrades PET to accelerate crystallization, resulting in a decrease in molecular weight; nano-SiO 2 High hardness, easy to wear processing equipment, add nano-SiO in the polymerization process 2 It has a thickening effect on the melt, and it is difficult to obtain high-molecular-weight PET, which will have a negative impact on the mechanical properties of the material; nano-TiO 2 Poor weather resistance and high hardness. When used in glass fiber reinforced PET engineering plastics, the glass fiber will be cut off, which will affect the mechanical properties of PET engineering plastics.

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