Composite PE (Polyethylene)-PPR (Poly Propylene) toughening pipe and preparation method thereof

Abstract

The invention discloses a composite PE (Polyethylene)-PPR (Poly Propylene) toughening pipe and a preparation method thereof, and belongs to the field of water supply pipes. The composite PE-PPR toughening pipe comprises three layers, wherein the inner layer is a heat-resistant and anti-bacterial PE layer; the middle layer is a light-blocking PPR layer; the outer layer is a toughening PPR layer; extrusion molding is realized through a tri-extruder. The composite PE-PPR toughening pipe disclosed by the invention has a long-acting broad-spectrum anti-bacterial function; compared with a traditional PPR pipe, the cold brittleness of a pipe is remarkably improved.

Description

technical field [0001] The invention relates to the field of water supply pipes, in particular to a composite PE-PPR toughened pipe and a preparation method thereof. Background technique [0002] At present, the most commonly used water pipes on the market are PPR (random copolymerized polypropylene) pipes, which are widely used in municipal water supply. The production process of PPR pipes is generally an extrusion molding process. First, the PPR raw materials in the hopper enter the extruder by their own weight. After heating, extruding and mixing in the barrel of the extruder, it is fully plasticized and extruded from the die of the extruder, and enters the shaping table. The shaped pipe is passed through the tractor, measured by the fixed length, and cut by the cutting machine to form a finished product. Its general production process is: PPR raw material—vacuum suction feeding—hopper storage—feeding—extrusion molding—cooling and shaping—pulling—cutting—inspection—storag...

AI Technical Summary

Problems solved by technology

CN103483846A (public date: 20140101) discloses the addition of a multi-component copolymerization toughening agent, which is prepared by multi-component graft copolymerization reaction of at least two of LDPE, APP, LMWPE, and EPDM in the presence of a certain concentration of initiator DCP, using the resin itself The flexibility and compatibility with PP can improve the toughness of PPR pipes, maintain good impact properties at low temperature, and reduce the brittle temperature. However, the above methods also reduce the elastic modulus and tensile strength of composite materials. Strength and high temperature creep properties, etc.

[0006] Inorganic rigid particle toughening method is a new technology developed in recent years. By adding inorganic particles, the cold brittleness of materials can be improved. There are two shortcomings in the use of inorganic rigid particles to toughen polymers: first, the addition of nanoparticles will cause flow of materials. The variable characteristics are unstable, which is not conducive to molding processing; the second is that the addition of simple nanoparticles is prone to agglomeration, which reduces the improvement effect

[0007] In order to improve the cold and brittleness of PPR pipes, new modification methods continue to emerge, such as CN106883518A (public date: 20170623) discloses that by using graphene / nylon 6 nanocomposites as toughening modifiers, sheet graphene and already in Amide reacts effectively through in-situ polymerization, so that graphene sheets can be evenly dispersed in the nylon 6 matrix, and then use the toughening mechanism of inorganic rigid particles and organic rigid particles to synergistically toughen the PPR material and improve the PPR material. Low-temperature toughness without losing the rigidity, strength and processing fluidity of PPR materials, but the preparation cost by this method is relatively high