CN-121975211-A - Ageing-resistant high-toughness PE (polyethylene) pipe and preparation method thereof

CN121975211ACN 121975211 ACN121975211 ACN 121975211ACN-121975211-A

Abstract

The invention relates to the technical field of PE pipes, in particular to an ageing-resistant high-toughness PE pipe and a preparation method thereof, wherein the ageing-resistant high-toughness PE pipe is prepared from the following raw materials in parts by weight: 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 8-15 parts of additive, 5-10 parts of functional auxiliary agent, 0.5-1.2 parts of calcium stearate and 0.3-0.8 part of compound antioxidant B900, wherein the functional auxiliary agent is prepared by mixing tannic acid and nano silicon dioxide with neutral protease and horseradish peroxidase under an acidic condition for reaction, the PE pipe is prepared through the processes of heating solidification, centrifugal separation, drying and crushing, and solves the problem that common PE pipes are easy to age and become brittle in outdoor environment, so that the service life of the pipe is prolonged, active groups generated by enzymatic reaction in functional auxiliary agents strengthen the interfacial compatibility of filler and polyethylene matrix, and the long-term stable use of the PE pipe in complex environment is ensured.

Inventors

WU ZHENGANG
JING FAQI
YAN PEIGANG
PEI JIE
An Zhichen
YE YI

Assignees

山东胜邦塑胶有限公司

Dates

Publication Date: 20260505
Application Date: 20260224

Claims (9)

1. The ageing-resistant high-toughness PE pipe is characterized by being prepared from the following raw materials, by weight, 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 8-15 parts of additives, 5-10 parts of functional additives, 0.5-1.2 parts of calcium stearate and 0.3-0.8 part of composite antioxidant B900; the raw materials of the additive comprise composite powder and mixed solution; The functional auxiliary agent raw materials comprise premix, tannic acid, nano silicon dioxide, neutral protease and horseradish peroxidase.
2. The method for preparing the anti-aging high-toughness PE pipe according to claim 1, wherein the method comprises the steps of mixing the mixed solution and the composite powder according to the mass ratio (0.4-0.6) of 1, stirring at the constant temperature of 48-50 ℃ for 4-5 hours to obtain mixed slurry, placing the mixed slurry in a centrifugal machine, centrifugally separating at the rotating speed of 2800-3200r/min for 12-15min, collecting the obtained first precipitate, washing the first precipitate with deionized water for 2-3 times, centrifugally separating at 2800-3200r/min for 10-12min after each washing, then placing the washed first precipitate in a 55-60 ℃ oven for drying for 7-8h, and crushing to the particle size of 80-150nm to obtain the additive.
3. The aging-resistant high-toughness PE pipe material according to claim 2, wherein the preparation method of the mixed solution comprises the following steps of stirring corncob powder, chitosan quaternary ammonium salt, neutral protease, horseradish peroxidase and sodium bicarbonate solution with the mass concentration of 8-10% for 20-30min at the rotating speed of 200-300r/min to obtain the mixed solution, wherein the mass ratio of the corncob powder to the chitosan quaternary ammonium salt to the neutral protease to the horseradish peroxidase to the sodium bicarbonate solution is (20-30) (3-5) (0.01-0.02) (50-80).
4. The aging-resistant high-toughness PE pipe according to claim 2, wherein the preparation method of the composite powder comprises the following steps: Mixing KH-171 with ethanol, adding KH550 into the solution, stirring for 15-20min at 200-300r/min, and standing for 12-18min to obtain a first treatment solution, wherein the mass ratio of KH-171 to ethanol to KH550 is 1 (15-18): 4-6; Mixing the vermiculite powder and the hydrochloric acid solution according to the mass ratio of (7-8): 1, standing for 2-2.5h, and stirring for 1 time every 20-30min, wherein each stirring time is 1-2min, so as to obtain a second treatment solution; step three, the second treatment solution is subjected to reduced pressure filtration to collect a second precipitate, and deionized water is used for cleaning the second precipitate until the pH value of the cleaning solution is 6.5-7.0; And fourthly, placing the second precipitate in a 100-105 ℃ oven for 3-4 hours, adding the first treatment liquid, stirring at a constant temperature of 60-65 ℃ for 3-4 hours, collecting the third precipitate again by adopting a decompression filtering mode, washing the third precipitate with deionized water for 2-3 times, filtering, draining, and placing the third precipitate in a 55-60 ℃ oven for 5-6 hours to obtain the composite powder.
5. The aging-resistant high-toughness PE pipe according to claim 4, wherein the mass ratio of the first treatment liquid to the second precipitate after drying is (0.06-0.1): 1.
6. The aging-resistant high-toughness PE pipe according to claim 1, wherein the preparation method of the functional auxiliary agent comprises the following steps: Step 1, mixing premix, tannic acid and nano silicon dioxide according to the mass ratio of (0.08-0.12) (0.01-0.03), and regulating the pH value to 5.6-6.0 to obtain a composite treatment liquid; Step 2, mixing the compound treatment solution, neutral protease and horseradish peroxidase according to the mass ratio of 1 (0.01-0.05), and stirring for 3-4 hours at 45-50 ℃ at 150-200r/min to obtain a reaction solution; Step 3, keeping the temperature of the reaction liquid at 45-50 ℃ for 30-45min, then centrifugally separating at the rotation speed of 2800-3200r/min for 12-15min, and collecting to obtain a fourth precipitate; And 4, cleaning the fourth precipitate with deionized water for 2-3 times, filtering and draining after each cleaning, placing the fourth precipitate in a 55-60 ℃ oven for 6-7 hours, and crushing the fourth precipitate to the particle size of 150-200nm to obtain the functional auxiliary agent.
7. The method for preparing the aging-resistant high-toughness PE pipe according to claim 6, wherein the preparation method comprises the steps of taking additive powder, washing the additive powder with deionized water for 2-3 times, soaking the additive powder for 10-15min after washing each time, draining water, placing the additive powder in a 55-60 ℃ oven for 5-6h, mixing the dried additive powder with phosphoric acid buffer solution according to the mass ratio of (14-16): 1 to obtain a third treatment liquid, adding neutral protease into the third treatment liquid, stirring the mixture for 3.5-4h at the temperature of 48-50 ℃ for 1 time every 20-30min to obtain a fourth treatment liquid, removing insoluble matters from the fourth treatment liquid in a decompression filtration mode, collecting filtrate, centrifuging the filtrate at the rotation speed of 2800-3200r/min for 10-12min, and taking supernatant to obtain the premix liquid, wherein the mass ratio of the neutral protease to the third treatment liquid is (0.01-0.02): 1.
8. The aging-resistant high-toughness PE pipe according to claim 7, wherein the preparation method of the additive powder comprises the following steps: Mixing alkali lignin, aminopropyl triethoxysilane and 3-5% ethanol water solution according to the mass ratio of (0.05-0.1) (10-15), regulating pH to 5.5-6.0 with 5% hydrochloric acid solution, and stirring at the speed of 150-200r/min for 60-90min at 40-45 ℃ to obtain a first mixed solution; Mixing feather powder with the first mixed solution according to the formula 1 (2-3), stirring for 5-8min every 20-30min during soaking for 2-3h at 35-40 ℃ to obtain a second mixed solution, centrifugally separating the second mixed solution for 10-12min at 2800-3200r/min, collecting a fifth precipitate, washing the fifth precipitate with deionized water for 2-3 times, and drying in a 50-55 ℃ oven for 4-5h to obtain the first mixed powder; step c, mixing deionized water, 30% hydrogen peroxide and urea according to the mass ratio of 100 (0.5-1.0) to 1-2 to obtain additive solution; And d, mixing the first mixed powder and the additive liquid according to the mass ratio of 1 (1.5-2.0), soaking for 1-1.5h at 25-30 ℃, performing ultrasonic dispersion at 100-150W and 40kHz in the soaking process for 10-15min, filtering and draining to obtain second mixed powder, and drying the second mixed powder in a 55-60 ℃ oven for 3-4h to obtain the additive powder.
9. The aging-resistant high-toughness PE pipe according to claim 1, wherein the preparation method comprises the following steps: S1, weighing high-density polyethylene, linear low-density polyethylene, additives, functional additives, calcium stearate and a composite antioxidant B900 according to parts by weight, putting into a mixer, and mixing for 10-15min under the condition of 300-500r/min to obtain a mixed material; s2, adding the mixed materials into a double-screw extruder, setting the temperature of each section of the extruder to be 160-180 ℃, and extruding and granulating at the screw speed of 200-300r/min to obtain granules; And S3, adding the granules into a pipe extruder, setting the barrel temperature to be 170-190 ℃, the head temperature to be 180-200 ℃, the screw rotating speed to be 80-120r/min, and cooling and shaping after extrusion molding to obtain the ageing-resistant high-toughness PE pipe.

Description

Ageing-resistant high-toughness PE (polyethylene) pipe and preparation method thereof Technical Field The invention relates to the technical field of PE pipes, in particular to an aging-resistant high-toughness PE pipe and a preparation method thereof. Background The ageing-resistant high-toughness PE pipe is a novel pipe with excellent ageing resistance and high toughness based on polyethylene, and is widely applied to the fields of urban water supply and drainage, gas transportation, agricultural irrigation and chemical fluid transportation. When the PE pipe is used for a long time under a complex working condition, the PE pipe is easily influenced by ultraviolet irradiation, oxygen permeation and stress, molecular chain degradation is caused, ageing and embrittlement, toughness reduction and cracking damage are caused, the service life and reliability are seriously influenced, in order to solve the problems that the PE pipe is weak in ageing resistance and insufficient in toughness, ageing and embrittlement and cracking damage are easily caused, a single anti-aging agent is usually selected to be added for modification, but the introduced single anti-aging agent is difficult to achieve the dual effects of oxidation resistance and physical barrier, ageing resistance and long-acting property are insufficient, and long-term stable use requirements under a complex environment are difficult to meet. Disclosure of Invention The invention aims to provide an ageing-resistant high-toughness PE pipe and a preparation method thereof, and the pipe prepared by the invention not only has excellent ageing resistance, but also has outstanding impact toughness and flexibility, and effectively improves the long-acting stable use performance of the PE pipe in a complex environment. The technical scheme is that the ageing-resistant high-toughness PE pipe is prepared from the following raw materials, by weight, 40-60 parts of high-density polyethylene, 20-30 parts of linear low-density polyethylene, 8-15 parts of additives, 5-10 parts of functional additives, 0.5-1.2 parts of calcium stearate and 0.3-0.8 part of composite antioxidant B900; the raw materials of the additive comprise composite powder and mixed solution; The functional auxiliary agent raw materials comprise premix, tannic acid, nano silicon dioxide, neutral protease and horseradish peroxidase. Preferably, the preparation method of the additive comprises the following steps of mixing a mixed solution and composite powder according to the mass ratio (0.4-0.6): 1, stirring at the constant temperature of 48-50 ℃ for 4-5 hours to obtain mixed slurry, placing the mixed slurry into a centrifugal machine, centrifugally separating at the rotating speed of 2800-3200r/min for 12-15min, collecting to obtain a first precipitate, washing the first precipitate with deionized water for 2-3 times, centrifugally separating at 2800-3200r/min for 10-12min after each washing, then placing the washed first precipitate into a 55-60 ℃ oven for 7-8 hours, and crushing to the particle size of 80-150nm to obtain the additive. Preferably, the preparation method of the mixed solution comprises the following steps of stirring corncob powder, chitosan quaternary ammonium salt, neutral protease, horseradish peroxidase and sodium bicarbonate solution with the mass concentration of 8-10% for 20-30min at the rotating speed of 200-300r/min to obtain the mixed solution, wherein the mass ratio of the corncob powder to the chitosan quaternary ammonium salt to the neutral protease to the horseradish peroxidase to the sodium bicarbonate solution is (20-30) (3-5) (0.01-0.02) (50-80). Preferably, the preparation method of the composite powder comprises the following steps: Mixing KH-171 with ethanol, adding KH550 into the solution, stirring for 15-20min at 200-300r/min, and standing for 12-18min to obtain a first treatment solution, wherein the mass ratio of KH-171 to ethanol to KH550 is 1 (15-18): 4-6; Mixing the vermiculite powder and the hydrochloric acid solution according to the mass ratio of (7-8): 1, standing for 2-2.5h, and stirring for 1 time every 20-30min, wherein each stirring time is 1-2min, so as to obtain a second treatment solution; step three, the second treatment solution is subjected to reduced pressure filtration to collect a second precipitate, and deionized water is used for cleaning the second precipitate until the pH value of the cleaning solution is 6.5-7.0; And fourthly, placing the second precipitate in a 100-105 ℃ oven for 3-4 hours, adding the first treatment liquid, stirring at a constant temperature of 60-65 ℃ for 3-4 hours, collecting the third precipitate again by adopting a decompression filtering mode, washing the third precipitate with deionized water for 2-3 times, filtering, draining, and placing the third precipitate in a 55-60 ℃ oven for 5-6 hours to obtain the composite powder. Preferably, the mass ratio of the first treatment liquid to the second precipitate aft