CN-117386893-B - Multilayer composite antibacterial PE water supply pipeline and preparation process thereof

CN117386893BCN 117386893 BCN117386893 BCN 117386893BCN-117386893-B

Abstract

The invention discloses a multilayer composite antibacterial PE water supply pipeline and a preparation process thereof, the pipeline comprises an inner layer, an outer layer and a middle layer, wherein the inner layer is a modified antibacterial inner layer, the outer layer is an ultraviolet-proof outer layer and the middle layer is a mechanical reinforcing middle layer, preparing the raw materials of the corresponding modified layer according to the proportion, and performing the process steps of material preparation, material mixing, melting, co-extrusion, cutting shaping, deburring, rest and the like to obtain the multilayer composite antibacterial PE water supply pipeline. The invention has the beneficial effects that the inner layer of the antibacterial pipeline adopts special PE material, has excellent antibacterial performance after modification treatment, can durably resist the growth and reproduction of various microorganisms, is not easy to be influenced by water quality fluctuation and environment, is harmless to human bodies and environment by the material and antibacterial additive amount, is environment-friendly and sanitary, has excellent corrosion resistance, mechanical strength and durability, is simple in process and strong in practicability, and is suitable for large-scale production and engineering application.

Inventors

ZHOU FENG
XU MINGJU
ZHANG KAI
ZHU HUILING
LIU PING

Assignees

江苏惠升管业集团有限公司

Dates

Publication Date: 20260508
Application Date: 20231013

Claims (10)

1. The multilayer composite antibacterial PE water supply pipeline is characterized by comprising an inner layer, an outer layer and a middle layer, wherein the inner layer is a modified antibacterial inner layer, the outer layer is an ultraviolet-proof outer layer and the middle layer is a mechanical reinforcing middle layer, and the modified antibacterial inner layer comprises the following raw materials in parts by mass: 100-120 parts of high-density polyethylene, 8-12 parts of cationic polymer, 26-32 parts of ethylene-propylene copolymer (EVA), 5-10 parts of silver ion loaded nano carbon powder, 0.8-1.5 parts of nano silver powder, 2-5 parts of titanium dioxide nano powder, 0.1-0.5 part of antioxidant, 1-2 parts of compatilizer, 1-2 parts of cross-linking agent, 0.6-1 part of silane coupling agent, 3-5 parts of flowing agent paraffin, 5-8 parts of calcium-zinc stabilizer, 2-3 parts of defoaming agent methyl stearate and 1-3 parts of dispersing agent; The middle layer mechanical strengthening layer comprises the following raw materials in parts by mass: 100-120 parts of Medium Density Polyethylene (MDPE), 15-20 parts of polypropylene-ethylene-styrene copolymer, 10-15 parts of acrylic acid grafted polyethylene (PE-g-AA), 3-4 parts of plasticizer epoxy soybean oil, 5-8 parts of carbon fiber, 5-8 parts of glass fiber, 25-30 parts of nano titanium dioxide, 0.2-0.5 part of antioxidant, 3-5 parts of calcium-zinc stabilizer, 0.5-1 part of silane coupling agent, 1-2 parts of cross-linking agent and 1-2 parts of dispersing agent; the ultraviolet-proof outer layer comprises the following raw materials in parts by mass: 100-120 parts of Linear Low Density Polyethylene (LLDPE), 20-25 parts of titanium dioxide powder, 20-25 parts of calcium carbonate, 1-2 parts of a silane coupling agent, 0.5-0.8 part of a dispersing agent, 0.3-0.5 part of an antioxidant, 2-3 parts of an ultraviolet absorber and 2-3 parts of a light stabilizer.
2. The multilayer composite antimicrobial PE water supply pipe of claim 1, wherein the cationic polymer is a polymeric Polyethylenimine (PEI).
3. The multilayer composite antibacterial PE water supply pipeline according to claim 1, wherein the antioxidant is a 1:1 complex of an amine antioxidant and phosphite, the amine antioxidant is one of 4,4' -bis (alpha, alpha-dimethylphenyl) diphenylamine or N, N-di-sec-butyl-p-phenylenediamine, the phosphite is one of tris (tridecyl) phosphite, trilauryl phosphite and triisodecyl phosphite, the antioxidant used for the outer layer is a phosphate antioxidant, and the phosphate antioxidant is one of tripropyl phosphate (TPP) and triisooctyl phosphonate (TXP).
4. The multilayer composite antibacterial PE water supply pipeline according to claim 1, wherein the compatilizer used in the inner layer is acrylic acid grafted low-density polyethylene, and the grafting rate is 8-12%.
5. The multilayer composite antibacterial PE water supply pipeline as set forth in claim 1, wherein the silane coupling agents used in the inner layer and the middle layer are one of gamma-propyl methacrylate silane (MPS) and gamma-propyl methacrylate trimethoxy silane (MPTS).
6. The multilayer composite antibacterial PE water supply pipeline as claimed in claim 1, wherein the dispersing agent used for the inner layer, the middle layer and the outer layer is one of Sodium Dodecyl Benzene Sulfonate (SDBS) and Cetyl Trimethyl Ammonium Bromide (CTAB).
7. The multilayer composite antibacterial PE water supply pipeline according to claim 1, wherein the crosslinking agent used in the inner layer and the middle layer is food-grade peracetic acid.
8. The multilayer composite antibacterial PE water supply pipeline according to claim 1, wherein the ultraviolet absorber is one of phenyldione, phenylketone and phenyltrione, and the light stabilizer is one of light-stabilized ketone, specifically benzotriazole ketone and benzodiazolyl ketone.
9. The process for preparing the multilayer composite antibacterial PE water supply pipeline according to claim 1, which is characterized by comprising the following steps: s1, preparing materials, namely preparing required raw materials according to a formula, and mixing and weighing various raw materials according to an accurate proportion, wherein the raw materials comprise inner layer materials, middle layer materials and outer layer material base materials, and other additives and reinforcing materials which need to be added; S2, material mixing, namely mixing the raw materials of all layers of materials respectively, and mixing by using a closed mixer device to ensure the mixing uniformity, so that the components of each layer of materials are uniformly dispersed, obtaining a premix, and processing the premix into a proper shape to obtain an inner layer master batch, a middle layer master batch and an outer layer master batch; S3, melting, namely heating and melting each layer of master batch through a double-screw extruder to enable the master batch to be in a hot melt flowing state, and further stirring to ensure that the materials are melted sufficiently and uniformly; s4, co-extrusion, namely extruding all the hot-melt master batches simultaneously in a three-layer co-extrusion mode to ensure that the inner layer, the middle layer and the outer layer are tightly combined; s5, cooling and forming, namely cooling the extruded hot-melt material through a cooling device to quickly solidify and form the hot-melt material; S6, cutting and shaping, namely cutting the pipeline by using a proper cutting tool according to the preset size requirement, so as to ensure that the length and the shape of the pipeline meet the requirements; S7, deburring and finishing, namely after cutting, deburring and finishing the notch part of the pipeline, so that the notch is smooth and free of burrs, and the surface quality requirement is met.
10. The process for preparing the multi-layer composite antibacterial PE water supply pipeline according to claim 9, wherein the extrusion temperature of each layer in the co-extrusion operation is 185-188 ℃ for the outer layer, 193-198 ℃ for the middle layer and 205-210 ℃ for the inner layer.

Description

Multilayer composite antibacterial PE water supply pipeline and preparation process thereof Technical Field The invention relates to the technical field related to PE water supply pipelines, in particular to a multilayer composite antibacterial PE water supply pipeline and a preparation process thereof. Background The water supply pipeline system is an important component part of urban infrastructure and directly relates to normal operation of resident life and industrial production. However, conventional plumbing materials such as metals and plastics have long been subject to certain drawbacks during use, which can easily grow bacteria and other microorganisms, resulting in reduced water quality and health hazards. Conventional metal pipes, such as iron pipes and copper pipes, are susceptible to corrosion and rusting from oxygen and chemicals in water. This can lead to the pipeline inner wall to produce the covering, reduces the flow of pipeline and reduces quality of water, and the metal pipeline appears easily and connects the problem that leaks that looseness, corruption or ageing lead to, has increased maintenance and repair cost, and metal pipeline is heavier relatively, needs bigger equipment and manpower to install, has increased the degree of difficulty and the cost of construction. The concrete pipeline has lower toughness and fragility, is easy to crack and break when facing the change of underground soil, earthquake and other external forces, and the inner wall of the concrete pipeline can sometimes react with chemical substances in water to influence the water quality, so that the construction period and the cost are higher. Although plastic pipes such as PVC (polyvinyl chloride) are widely used in water supply systems, there are also some limitations that some plastic pipes may become brittle under high temperature conditions, limiting their range of use, and chemical resistance may be a problem for some special application scenarios. The PE water supply pipeline is used as a novel pipeline material, has a series of advantages compared with the traditional material, namely the PE pipeline has excellent corrosion resistance, can stably run for a long time under different water quality conditions, cannot be influenced by corrosion and rust, is relatively light, is easy to carry and install, and reduces the difficulty and cost of construction. The PE pipeline has excellent flexibility and toughness, can bear the change of underground soil and external impact force, reduces the risks of cracking and fracture, has smooth inner wall, is not easy to form scale, has good flow characteristics, reduces the occurrence of water quality problems, has longer service life, reduces the frequency of maintenance and repair, and reduces the cost. The water supply pipeline system is an important component of modern city infrastructure and directly relates to normal operation of domestic water, commercial and industrial production of residents. However, for a long time, the conventional water supply pipeline materials have problems of microorganism breeding, biofilm formation and the like, which cause adverse effects such as water quality reduction, scale accumulation, pipeline blockage and the like, and even may cause health and environmental risks. In order to ensure the water quality and sanitary safety of the water supply system, it is necessary to develop a water supply pipe material having an antibacterial function. The antimicrobial tubing material can inhibit the growth and attachment of microorganisms, thereby reducing water quality problems and health risks. The development of the antibacterial pipeline has important significance for providing reliable water quality safety guarantee, reducing the maintenance cost of the pipeline and prolonging the service life of the pipeline. Polyethylene (Polyethylene) is an ideal pipeline material and has the advantages of light weight, corrosion resistance, insulation and the like. However, the conventional PE material does not have antibacterial properties, and thus, improvement of material characteristics thereof is required to meet the demands of antibacterial water supply pipes. At present, some antibacterial technologies have been applied to water supply pipeline materials, such as methods of adding antibacterial agents, using nanotechnology and surface modification, and the like. However, the prior art has certain limitations in terms of antibacterial effect, durability, material stability, cost, environmental friendliness, and the like. Accordingly, there is a need to develop a new antimicrobial tubing material and process of manufacture that overcomes these limitations. Disclosure of Invention Aiming at the defects, the technology aims at providing a multilayer composite antibacterial PE water supply pipeline with lasting antibacterial property and a preparation process thereof, and by introducing various antibacterial substances and combining action, the tec