PPR/EVOH/POE (Pentatricopeptide Repeats/Ethylene-Vinyl Alcohol/Polyolefin Elastomer) blending high-impact barrier pipe and manufacturing method thereof

Abstract

The invention discloses a PPR / EVOH / POE (Pentatricopeptide Repeats / Ethylene-Vinyl Alcohol / Polyolefin Elastomer) blending high-impact barrier pipe and a manufacturing method thereof, belonging to the field of novel polymeric composite materials. A blending system is formed through physical blending by compositely using PPR, EVOH and POE and compatibilization is carried out on the blending system by adopting a PP-g-MAH (Polypropylene-grafting-Maleic Anhydride) nucleating agent, thus the problems of low temperature brittleness, oxygen and permeability resistance, corrosion resistance, ageing resistance, heat resistance, processability, and the like of a PPR pipe are effectively solved. The PPR / EVOH / POE blending high-impact barrier pipe has the following performances that: drawing yield pressure is 48 MPa, the impact strength of a freely supported beam is 3.6 KJ / m<2>, and oil absorption rate is 0.5%, longitudinal retraction rate is 1%; seepage and crack do not exist in hydrostatic tests and heat stability tests in hydrostatic states; and the PPR / EVOH / POE blending high-impact barrier pipe meets the safety evaluation criterion of domestic drinking water delivery and distribution equipment and protective materials. The invention can be widely applied to the fields of municipal and building water supply, heating, gas supply, electric power, communication, industry, agriculture, and the like.

Description

technical field [0001] The invention belongs to novel polymer composite materials, and mainly relates to PPR / EVOH / POE blended high-impact-resistant and anti-permeation pipes and a manufacturing method thereof. Background technique [0002] PP-R is also called three-type polypropylene and random copolymerized polypropylene. Random copolymerized polypropylene is extruded into pipes and injection molded into pipe fittings. Polypropylene random copolymer is also a kind of polypropylene, and the basic structure of its polymer chain is modified by adding different types of monomer molecules. Ethylene is the most commonly used monomer, which causes changes in the physical properties of polypropylene. Compared with pp homopolymers, random copolymers have improved optical properties (increased transparency and reduced haze), improved impact resistance, increased flexibility, lower melting temperature, and thus lower heat welding temperature ; At the same time in terms of chemical s...

AI Technical Summary

Problems solved by technology

[0004] On the one hand, the creep resistance and low temperature toughness of PPR pipes are poor

When the temperature drops to 32°C, it can maintain moderate impact strength, but when the temperature drops to -4°C, the toughness is limited

[0005] On the other hand, in the early 1980s, European and American technicians discovered that in the hot water circulation system using plastic pipes, the metal parts in the equipment are easily corroded, resulting in rapid damage to the equipment

In 1982, experts concluded that when the pipe is heated, oxygen molecules are more likely to penetrate the plastic layer and penetrate into the water in the pipe, resulting in rapid corrosion of metal parts in the equipment