Different plastic material pledges to do conduit, have on performance why difference

Different plastic material pledges to do conduit, have on performance why difference？

Plastic, as a derivative of petrochemical industry, has become a substitute for many traditional materials with excellent performance advantages. Today, there are a variety of plastic pipes on the market for different purposes, with different properties. Many people may not know the difference between them.

In fact, there are many kinds of plastic materials. So what kinds of plastics are commonly used to make pipes? Yifan Youjia, for you to introduce in detail.

I. Polypropylene

Polypropylene (PP) is a thermoplastic (heat-fusible) polymerized from propylene. It is the least dense plastic. It is usually a translucent colorless solid, odorless and non-toxic.

Due to the brittleness of polypropylene at low temperature, in order to improve this shortcoming, propylene is usually copolymerized with a small amount of ethylene molecules, thus polypropylene is divided into homopolymer polypropylene and copolymer polypropylene.

Polypropylene has excellent pressure performance, and is very easy to hot melt welding after being made into pipe. Compared with PE, it can withstand higher temperature, so it is widely used in home water supply pipeline. In the process of using polypropylene as pipeline raw material, it has experienced the following development process:

Pp-h is homopolymer polypropylene, commonly known as type ⅰ polypropylene. Completely made of propylene polymerization, impact resistance is poor, high temperature resistance is good. The pipeline is generally used for chemical pipeline or other engineering purposes.

Pp-b is block copolymer polypropylene, commonly known as type ⅱ polypropylene. Pp-b has high ethylene content, which greatly improves its low temperature impact resistance, but loses its high temperature resistance. So pipes made of it are generally suitable for cold water systems.

Pp-r for random copolymerization polypropylene, commonly known as Ⅲ type polypropylene, by a small amount of ethylene monomers and polymerization of propylene with trackless copolymerization method, it balances the advantage performance of PP, PP - B - H, can not only absorb a certain amount of high temperature, and improve the impact resistance at low temperature, as a more ideal, pipe material system can be widely used in cold and hot bath water. Nowadays, PPR had occupied the home to install the field to the great part of the market of conduit, this cannot leave stable and reliable and easy installation, still have the price of relative close people of course.

Pp-rct is also called high temperature resistant β -crystalline PPR, is a modified PPR material, commonly known as type ⅳ polypropylene. Because the hexagonal crystal is used instead of the monoclinic crystal of PP-R, pp-RCT has the common physical properties of PP-R, and is improved in heat resistance, pressure resistance, toughness and other aspects. At present, PP-RCT is mainly used in high temperature heating system.PB polybutene

Poly butene (PB) from the polymerization of butene into a thermoplastic plastic (hot melt), its non-toxic odorless, cold resistance and heat resistance are very good, known as the "gold in plastic".

PB tubes are usually milky white.

After being made into pipe, PB pipe has very good compressive resistance, but poor impact resistance and easy to crack. After hot melting, PB is thicker, and the cooling and hardening time is longer, so the construction difficulty is relatively high. As a heating system pipe, due to good thermal insulation performance, compared with better heat dissipation performance of PE material, is not suitable for floor heating pipe.