Microcellular foamed high-strength anti-aging ppa/petg composite plastic manhole cover and preparation method thereof

Abstract

The invention discloses a microporous foaming high-strength anti-aging PPA / PETG composite plastic manhole cover and a preparation method thereof. The PPA / PETG composite material is used as a matrix resin and embedded surface-loaded TiO is added. 2 Halloysite nanotube anti-aging composite foaming agent and dendritic calcium carbonate whisker material reinforcement, using the special tubular structure of halloysite, embedding p-toluenesulfonylsemicarbazide foaming agent in the inner wall of the tube, and loading on the surface with excellent ultraviolet rays Shielding function of TiO 2 , which can not only make the inside of the manhole cover evenly foam, effectively realize the weight reduction of the manhole cover, but also improve the anti-aging performance of the manhole cover. And using graphite flakes as the matrix template, calcium carbonate whiskers are synthesized by liquid phase reaction method and attached to the surface of graphite flakes to form a "dendritic" structure reinforcement material, using the anisotropy of calcium carbonate whiskers on the surface of graphite flakes and the graphite flake layer The characteristics of sliding between manholes can realize the strengthening effect on the manhole cover and overcome the reduction of the strength of the manhole cover due to foaming.

Description

technical field [0001] The invention relates to a composite plastic manhole cover and a preparation method thereof, in particular to a microcellular foamed high-strength anti-aging PPA / PETG composite plastic manhole cover and a preparation method thereof. Background technique [0002] In recent years, with the development of urbanization and the country's increased investment in infrastructure, whether it is a big city, a small city or a village, as long as there are public facilities such as water supply system, drainage system, power supply system and communication system, It is necessary to install inspection wells. According to statistics, the number of new and replaced manhole covers in the country is at least 10 million each year. [0003] Traditional manhole covers mainly include cast iron manhole covers, cement manhole covers, glass fiber reinforced plastic manhole covers, resin composite manhole covers, etc. Although cast iron manhole covers have high strength and l...

AI Technical Summary

Problems solved by technology

[0003] Traditional manhole covers mainly include cast iron manhole covers, cement manhole covers, fiberglass manhole covers, and resin composite manhole covers. Although cast iron manhole covers have high strength and long-lasting use, they are relatively brittle and easy to be crushed or even broken. The production cycle is long, and the beating noise is large when used, and it is easy to be stolen. After the theft, traffic and personal insurance accidents are very likely to occur; the cement manhole cover must be made very thick to achieve strength, and it is difficult to open, so the manhole cover is often stuck. It is brittle and easy to break; FRP manhole cover has good anti-theft performance and is more beautiful, but its anti-ultraviolet radiation ability is poor, it is easy to decompose, and the coefficient of thermal expansion and contraction is not synchronized with the road, the durability is short, the compression resistance is poor, and the material is brittle Very large and easy to break; the resin manhole cover has low strength and insufficient bearing capacity, which can only meet the minimum level requirements of the manhole cover standard, and is prone to aging and creep;

[0004] Polyphthalamide (PPA for short) is a semi-aromatic polyamide made of terephthalic acid or phthalic acid. It is a semi-crystalline thermoplastic aromatic polyamide with high rigidity and high heat resistance. , high strength and excellent electrical properties, etc., but because of its high temperature resistance, its fluidity is poor, making processing more difficult

Images