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CN-121975213-A - Ultraviolet-resistant high-strength PE power pipe and preparation method thereof

CN121975213ACN 121975213 ACN121975213 ACN 121975213ACN-121975213-A

Abstract

The application discloses an ultraviolet-resistant high-strength PE power pipe and a preparation method thereof, and relates to the technical field of power pipes. An ultraviolet-resistant high-strength PE power pipe comprises a resin master batch, a composite reinforcing filler, maleic anhydride grafted POE, carbon black, a weather-resistant auxiliary agent and a lubricant, wherein the resin master batch comprises 100-grade high-density polyethylene in bimodal distribution, and the composite reinforcing filler is a composition of modified glass fiber and modified calcium carbonate. By adopting the technical scheme of the application, the PE pipe can be used for improving the rigidity, the mechanical strength and the weather resistance of the PE power pipe by only cooperating with a small amount of weather-resistant auxiliary agents while greatly reducing the carbon black consumption, and solves the problems that the traditional pipe is subjected to stress cracking after long-time ultraviolet aging or in a low-temperature environment.

Inventors

  • GAN ZHICHAO
  • TAN SHUJUN
  • CHEN ZHIXIONG

Assignees

  • 广东互顺通塑胶工程技术有限公司

Dates

Publication Date
20260505
Application Date
20260228

Claims (10)

  1. 1. The ultraviolet-resistant high-strength PE power pipe is characterized by comprising the following raw materials in parts by mass: 100 parts of resin master batch; 8-10 parts of composite reinforcing filler; 4-6 parts of maleic anhydride grafted POE; 1 to 1.5 portions of carbon black; 0.4-0.6 part of weather-resistant auxiliary agent; 0.5-0.8 part of lubricant; the resin master batch comprises 100-level high-density polyethylene in bimodal distribution, and the composite reinforcing filler is a composition of modified glass fiber and modified calcium carbonate.
  2. 2. The ultraviolet resistant high-strength PE power pipe as claimed in claim 1, wherein the resin master batch further comprises linear low-density polyethylene, and the mass ratio of the high-density polyethylene to the linear low-density polyethylene is (8.8-9.5) (0.5-1.2).
  3. 3. The ultraviolet resistant high-strength PE power pipe as claimed in claim 2, wherein the linear low-density polyethylene is hexene copolymerized linear low-density polyethylene.
  4. 4. The ultraviolet-resistant high-strength PE power pipe according to claim 1, wherein the mass ratio of the modified glass fiber to the modified calcium carbonate in the composite reinforcing filler is (1-4) 1; The modified glass fiber is glass fiber modified by silane, the length-diameter ratio of the modified glass fiber is more than 50, the length is 0.5-5mm, and the modified calcium carbonate is superfine calcium carbonate subjected to surface activation treatment.
  5. 5. The ultraviolet resistant high-strength PE power pipe as claimed in claim 4, wherein the preparation method of the modified glass fiber comprises the following steps: Firstly, soaking and cleaning continuous glass fibers by using absolute ethyl alcohol, drying, immersing the glass fibers in an aqueous solution of a silane coupling agent, heating and continuously soaking, taking out, heating and drying, and cutting after the glass fibers are sufficiently dried to obtain the modified glass fibers.
  6. 6. The ultraviolet resistant high-strength PE power pipe according to claim 5, wherein when cutting, the long modified glass fiber is obtained by cutting according to the length of 4-5mm, the short modified glass fiber is obtained by cutting according to the length of 0.5-0.8mm, and the long modified glass fiber and the short modified glass fiber are fully mixed, wherein the mass ratio of the long modified glass fiber to the short modified glass fiber is (1.5-3): 1.
  7. 7. The ultraviolet resistant high-strength PE power pipe material as claimed in claim 4, wherein the preparation method of the modified calcium carbonate comprises the following steps: Dispersing superfine calcium carbonate into suspension by using absolute ethyl alcohol, heating to 65-70 ℃, adding a modifier formed by mixing a titanate coupling agent and stearic acid, continuously stirring and reacting for 1-3h, filtering, and vacuum drying to obtain modified calcium carbonate.
  8. 8. The PE power pipe with high strength and ultraviolet resistance according to claim 7, wherein the mass of the modifier is 1.5-2% of that of superfine calcium carbonate, and the mass ratio of the titanate coupling agent to the stearic acid in the modifier is (2-3): 1.
  9. 9. The ultraviolet resistant high-strength PE power pipe as claimed in claim 1, wherein the weather-resistant auxiliary agent is a combination of UV-2020 and UV-329, and the lubricant is one or more of stearic acid, PE wax and ethylene bis-stearamide.
  10. 10. A method for preparing an ultraviolet-resistant high-strength PE power pipe, for preparing a PE power pipe according to any one of claims 1 to 9, comprising the steps of: s1, fully mixing the mixed master batch, the composite reinforcing filler, the maleic anhydride grafted POE, the carbon black, the weather-resistant auxiliary agent and the lubricant according to a proportion, and then performing extrusion molding, cooling and cutting to obtain the PE power pipe.

Description

Ultraviolet-resistant high-strength PE power pipe and preparation method thereof Technical Field The invention relates to the technical field of power pipes, in particular to an ultraviolet-resistant high-strength PE power pipe and a preparation method thereof. Background Polyethylene (PE) power tubing is widely used for cable protection due to its good insulation, corrosion resistance and processability. On the one hand, with the continuous advancement of construction of electric power facilities in recent years, the strength requirements on the electric power pipes are increasingly strict to ensure that the electric power pipes can bear external pressure and mechanical impact, and on the other hand, the electric power pipes also need to have good ultraviolet resistance to prevent premature aging and performance degradation of materials due to long-term exposure to sunlight. In the prior art, in order to make the outdoor PE power pipe have good mechanical strength and long-acting ultraviolet resistance, a high-strength resin base material is generally selected to be matched with an additive for physical shielding. For example, aiming at the strength of the pipe, high-density polyethylene is generally adopted, the filler content is improved, the higher molecular weight and crystallinity of the high-density polyethylene are utilized to cooperate with high-content rigid filler, so that the ring stiffness of the electric pipe can be further improved, the basic requirement of the pipe on the strength can be well met, and aiming at the ultraviolet resistance, high-concentration carbon black or an aging-resistant auxiliary agent is generally directly added, on one hand, the high-filling carbon black or the aging-resistant auxiliary agent can effectively absorb and scatter ultraviolet rays, the damage of the ultraviolet rays on the internal material of the electric pipe is directly reduced, and on the other hand, the high-filling carbon black can cooperate with the filler to further improve the mechanical strength of the electric pipe. However, in order to pursue high strength, high rigidity and good ultraviolet resistance, a large amount of carbon black, an aging-resistant auxiliary agent or other reinforcing fillers are blindly added, and although the target performance can be obviously improved, the toughness of a polyethylene matrix is seriously damaged, so that the whole brittleness is increased, the impact resistance is reduced, and particularly, stress cracks are easily induced by external collision or impact after long-time aging or in a low-temperature environment at stress concentration positions such as pipe connection and notch, thereby seriously threatening the long-term reliability and engineering safety of the pipe. Disclosure of Invention In order to improve the strength and ultraviolet resistance of PE power pipes, reduce the influence of reinforcing filler or weather-resistant auxiliary agent on the toughness and impact resistance of the pipes, and prevent the occurrence of stress cracking and other problems after long-time aging or in a low-temperature environment, the application provides an ultraviolet-resistant high-strength PE power pipe and a preparation method thereof. In a first aspect, the application provides an ultraviolet-resistant high-strength PE power pipe, which adopts the following technical scheme: An ultraviolet-resistant high-strength PE power pipe comprises the following raw materials in parts by mass: 100 parts of resin master batch; 8-10 parts of composite reinforcing filler; 4-6 parts of maleic anhydride grafted POE; 1 to 1.5 portions of carbon black; 0.4-0.6 part of weather-resistant auxiliary agent; 0.5-0.8 part of lubricant; the resin master batch comprises 100-level high-density polyethylene in bimodal distribution, and the composite reinforcing filler is a composition of modified glass fiber and modified calcium carbonate. By adopting the technical scheme, the PE conduit can greatly reduce the carbon black consumption and only cooperate with a small amount of weather-resistant auxiliary agent, so that the rigidity, mechanical strength and weather resistance of the PE power pipe are improved, and the compatibility among all raw material components can be effectively improved by adopting maleic anhydride grafted POE as a toughening compatilizer in a system, so that the negative influence of the composite reinforcing filler on the toughness and impact resistance of the pipe during reinforcing is further reduced, and the problems of stress cracking and the like of the traditional pipe after long-time ultraviolet aging or in a low-temperature environment are solved. Optionally, the resin master batch also comprises linear low-density polyethylene, wherein the mass ratio of the high-density polyethylene to the linear low-density polyethylene is (8.8-9.5) (0.5-1.2). By adopting the technical scheme, a small amount of linear low-density polyethylene and high-density polyethyl