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CN-122011595-A - Impact-resistant PP-R pipe and preparation method thereof

CN122011595ACN 122011595 ACN122011595 ACN 122011595ACN-122011595-A

Abstract

The application discloses an impact-resistant PP-R pipe and a preparation method thereof, and relates to the field of plastic pipes. The shock-resistant PP-R pipe comprises, by weight, 73-85 parts of random copolymer polypropylene resin, 2-5 parts of modified zinc oxide whiskers, 8-12 parts of hydrogenated styrene-butadiene-styrene block copolymer, 5-9 parts of toughening color master batch, 0.5-1 part of light stabilizer, 0.7-1.2 parts of antioxidant, wherein the toughening color master batch comprises, by weight, 80-86 parts of random copolymer polypropylene resin, 0.3-0.6 part of nucleating agent, 5-10 parts of calcium carbonate, 2-4 parts of dispersing agent and 12-18 parts of pigment. The PP-R pipe solves the problems of low-temperature brittleness and large linear expansion coefficient of the PP-R pipe in the prior art.

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
20260512
Application Date
20260124

Claims (10)

  1. 1. The shock-resistant PP-R pipe is characterized by comprising the following raw materials in parts by weight: 73-85 parts of random copolymer polypropylene resin; 2-5 parts of modified zinc oxide whisker; 8-12 parts of hydrogenated styrene-butadiene-styrene block copolymer; 5-9 parts of toughening color master batch; 0.5-1 part of light stabilizer; 0.7-1.2 parts of antioxidant; the toughening color master batch comprises the following raw materials of 80-86 parts of random copolymer polypropylene resin, 0.3-0.6 part of nucleating agent, 5-10 parts of calcium carbonate, 2-4 parts of dispersing agent and 12-18 parts of pigment.
  2. 2. The anti-impact PP-R pipe according to claim 1, wherein the modified zinc oxide whisker is prepared by the following steps: pre-drying zinc oxide whisker at 100-120 deg.c for 2-3 hr to eliminate surface adsorbed water; Mixing stearic acid, zinc ricinoleate and ethanol solvent, heating to 60-75deg.C, and completely dissolving zinc stearate and zinc ricinoleate by ultrasonic wave to obtain mixed solution; Slowly adding zinc oxide whisker into the mixed solution in batches under the condition of 500-800r/min, continuously stirring for 30-45min at 60-70 ℃, cooling, filtering, taking out the whisker, washing with ethanol for 2-3 times, vacuum drying for 4-6h at 80-100 ℃, and sieving to obtain the modified zinc oxide whisker.
  3. 3. The anti-impact PP-R pipe according to claim 2, wherein the weight ratio of the zinc oxide whisker to the stearic acid to the zinc ricinoleate is 1 (5% -8%) (2% -4%).
  4. 4. The anti-impact PP-R pipe material according to claim 1, wherein the calcium carbonate is modified light calcium carbonate, and is prepared by the following steps: weighing light calcium carbonate, adding deionized water to prepare slurry with the mass fraction of 10%, heating to 80-85 ℃, stirring uniformly, adding phosphate which respectively accounts for 0.4-0.7% of the mass of the calcium carbonate and coconut oil which accounts for 1-3% of the mass of the calcium carbonate, carrying out heat preservation and stirring reaction for 2-3 hours, and carrying out suction filtration, drying, crushing and sieving on the obtained slurry to obtain the modified light calcium carbonate.
  5. 5. The PP-R pipe with impact resistance according to claim 1, wherein the melt index of the polypropylene random copolymer resin is 0.1-0.5g/10min,230 ℃ per 2.16kg.
  6. 6. The PP-R pipe material with impact resistance according to claim 1, wherein the dispersing agent is one or two of polyethylene wax and oxidized polyethylene wax.
  7. 7. The PP-R pipe material with impact resistance according to claim 1, wherein the antioxidant is a mixture of hindered phenol antioxidant and phosphite antioxidant according to a ratio of 1.2-1.5:1.
  8. 8. The PP-R pipe material with impact resistance according to claim 1, wherein the pigment is one or more of phthalocyanine blue, phthalocyanine green, permanent orange, permanent red, toluidine red, titanium pigment and carbon black.
  9. 9. The PP-R pipe material according to claim 1, wherein the nucleating agent comprises one or two of a nucleating agent TMB-5 and a nucleating agent WBG-II.
  10. 10. The method for preparing the impact-resistant PP-R pipe according to any one of claims 1 to 9, which is characterized by comprising the following steps: putting the raw materials of the toughening color master batch into a high-speed mixer for mixing, and extruding and slicing by a double-screw extruder to obtain the toughening color master batch; Adding the toughening color master batch, the random copolymer polypropylene resin, the modified zinc oxide whisker and the hydrogenated styrene-butadiene-styrene block copolymer into a mixer, and stirring for 2-5min to obtain a mixture; Extruding and granulating the mixture by a double-screw extruder at 170-220 ℃ to obtain a mixed material; the mixed material is extruded and molded at 170-220 ℃ to obtain the impact-resistant PP-R pipe.

Description

Impact-resistant PP-R pipe and preparation method thereof Technical Field The invention relates to the field of plastic pipes, in particular to an impact-resistant PP-R pipe and a preparation method thereof. Background The PP-R resin, namely the random copolymer polypropylene, is a random copolymer formed by copolymerizing propylene with another olefin monomer (or olefin monomers). The PP-R resin has the advantages of good high-temperature creep resistance, good combination of hardness and impact resistance, chemical corrosion resistance, low heat conductivity, easy processing, recycling and the like. The PP-R pipe is produced by adopting a special material of random polypropylene and adopting a single screw extruder with a special screw rod of the PP-R pipe and a special extrusion die head of the PP-R pipe in a mixing section through an extrusion molding process. The PP-R pipe has the characteristics of sanitation, no smell, heat preservation and energy conservation, and is widely applied to the transportation of cold and hot water. The PP-R pipe is used as a main flow pipe of a pipe for cold and hot water, has the problem of low-temperature brittleness, and is easy to crack when being physically impacted by external force in a cold environment, and has the problem of water leakage when being used. Meanwhile, the PP-R pipe has a large linear expansion coefficient, is easy to deform during installation and use, influences the appearance, and needs to be improved. Disclosure of Invention The application provides an impact-resistant PP-R pipe and a preparation method thereof, aiming at solving the problems of low-temperature brittleness and large linear expansion coefficient of the PP-R pipe in the prior art. The PP-R pipe and the preparation method thereof provided by the application adopt the following technical scheme: in a first aspect, the application discloses an impact-resistant PP-R pipe, which comprises the following raw materials in parts by weight: 73-85 parts of random copolymer polypropylene resin; 2-5 parts of modified zinc oxide whisker; 8-12 parts of hydrogenated styrene-butadiene-styrene block copolymer; 5-9 parts of toughening color master batch; 0.5-1 part of light stabilizer; 0.7-1.2 parts of antioxidant; the toughening color master batch comprises the following raw materials of 80-86 parts of random copolymer polypropylene resin, 0.3-0.6 part of nucleating agent, 5-10 parts of calcium carbonate, 2-4 parts of dispersing agent and 12-18 parts of pigment. According to the technical scheme, the hydrogenated styrene-butadiene-styrene block copolymer is added into the PP-R pipe for toughening the resin, so that the toughness of a low-temperature environment is improved, meanwhile, the hydrogenated styrene-butadiene-styrene block copolymer has a saturated rubber phase, the ageing resistance is good, the zinc oxide whisker is added to reduce the linear expansion coefficient of the pipe, the effect of reinforcing and toughening is achieved, meanwhile, the zinc oxide whisker and active oxygen are used, the polypropylene pipe has a certain antibacterial property and is more beneficial to the transportation of cold and hot water, the nucleating agent is added into the toughening color master batch for increasing the beta-PP content in polypropylene, the impact resistance and the thermal deformation performance of the pipe are effectively improved, the calcium carbonate is added as a filler to play a role of toughening, the low-temperature toughness is improved, and the dimensional stability of the pipe is improved. The antioxidant and the light stabilizer are added for compounding, and meanwhile, the heat and light oxidation aging is prevented, so that the service life of the pipe under the hot water conveying condition is remarkably prolonged. Optionally, the modified zinc oxide whisker is prepared by the following steps: pre-drying zinc oxide whisker at 100-120 deg.c for 2-3 hr to eliminate surface adsorbed water; Mixing stearic acid, zinc ricinoleate and ethanol solvent, heating to 60-75deg.C, and completely dissolving zinc stearate and zinc ricinoleate by ultrasonic wave to obtain mixed solution; Slowly adding zinc oxide whisker into the mixed solution in batches under the condition of 500-800r/min, continuously stirring for 30-45min at 60-70 ℃, cooling, filtering, taking out the whisker, washing with ethanol for 2-3 times, vacuum drying for 4-6h at 80-100 ℃, and sieving to obtain the modified zinc oxide whisker. By adopting the technical scheme, the zinc oxide whisker is modified by selecting the composite of stearic acid and zinc ricinoleate, the stearic acid is anchored on the surface of the zinc oxide whisker to form a hydrophobic long-chain coating layer, the lipophilicity of the zinc oxide whisker is improved, the dispersion of the resin is improved, and the zinc ricinoleate and the surface of the zinc oxide whisker have metal-oxygen/metal-hydroxyl interaction, so that the compatibility and