Oxygen barrier material for PB tube and preparation method thereof and oxygen barrier PB tube

Abstract

The invention provides an oxygen barrier material for a PB tube and a preparation method thereof and the oxygen barrier PB tube. The preparation method of the oxygen barrier material comprises the following steps: (1) uniformly mixing nano-alumina and a surface modification solution according to a weight ratio of (85-95):(5-15) to obtain surface-modified nano-alumina, the surface modification solution comprising acetone and vinyl tri (2-methoxyethoxy) silane; and (2) mixing polybutylene, the surface-modified nano-alumina obtained in the step (1) and a lubricant, and performing extruding at 130-180 DEG C to obtain the oxygen barrier material for the PB tube, wherein the weight ratio of polybutylene to the surface-modified nano-alumina obtained in the step (1) is (50-35):(40-25). The oxygenbarrier material for the PB tube can be added into the PB tube, so that a compact oxygen barrier structure is microscopically formed in the PB tube, and oxygen permeation is effectively prevented; andthe PB tube disclosed by the invention has good mechanical property and oxygen barrier property.

Description

technical field [0001] The invention relates to the field of plastic pipes, in particular to an oxygen barrier material for PB pipes, a preparation method and an oxygen barrier PB pipe. Background technique [0002] Polybutylene PB pipe has become the mainstream radiator heating pipe in the market due to its stable material properties, good flexibility, high temperature and pressure resistance, stable chemical properties, excellent resistance to low temperature brittleness, and good creep resistance. . [0003] The single-layer PB pipe is water-tight rather than air-tight, and does not have the function of preventing oxygen seepage. Oxygen in the air will seep through the plastic pipe wall into the closed circulating water of the heating system. There are currently two types of oxygen barrier PB pipes on the market, both of which use a very thin (only about 10 filaments) ethylene-vinyl alcohol copolymer (EVOH) resin layer as the oxygen barrier layer. The three-layer anti-s...

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Problems solved by technology

The three-layer anti-seepage oxygen pipe is to add EVOH oxygen barrier layer on the basis of ordinary PB pipe, without changing the wall thickness of the pipe, and the pressure bearing effect has no obvious change, because EVOH resin is easy to absorb moisture and the EVOH resin oxygen barrier after moisture absorption The capacity will be greatly reduced, and surface scratches will also reduce the oxygen barrier effect; the adhesive layer of the five-layer oxygen-proof pipe tightly bonds the EVOH layer and the actual wall thickness of the PB, which increases the pipe wall thickness and withstands pressure. The effect is better, but the five-layer oxygen-proof pipe is difficult to process and the equipment cost is high

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