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CN-116693984-B - Synergistic composite toughened PP-R pipe material and preparation method and application thereof

CN116693984BCN 116693984 BCN116693984 BCN 116693984BCN-116693984-B

Abstract

The invention provides a synergistic composite toughened PP-R pipe material and a preparation method and application thereof, and belongs to the technical field of PP pipes. In the synergistic composite toughening modified PP-R pipe material provided by the invention, the addition of the elastomer toughening agent can improve the low-temperature toughness of the material. The addition of the compatilizer can improve the interface bonding problem of the blend, especially improve the dispersion effect of the elastomer toughening agent and PE, and reduce the phase separation between the PP, the elastomer and the PE. According to the invention, the PP-R/elastomer/PE/PP-B multi-element synergistic composite toughening system is formed by the components, so that the complementation and synergistic improvement of the performances among materials are realized, and the improvement of the performances of the PP-R pipe is realized.

Inventors

  • WANG JINGWANG
  • SU HOUXIN
  • BU SHUYUN

Assignees

  • 天津中财型材有限责任公司

Dates

Publication Date
20260508
Application Date
20230608

Claims (8)

  1. 1. The synergistic composite toughening modified PP-R pipe material is characterized by comprising the following preparation raw materials in parts by weight: 70-75 parts of PP-R resin, 20 parts of PP-elastomer toughening agent and 5-10 parts of PP-PE toughening agent; The PP-elastomer toughening agent is prepared from 75-94 parts of PP-R resin, 5-20 parts of elastomer toughening agent and 1-5 parts of polymer grafted maleic anhydride compatilizer; the PP-PE toughening agent is prepared from 75-92 parts of PP-R resin, 1-5 parts of PP-B resin, 5-10 parts of metallocene polyethylene, 1-5 parts of ultra-high molecular weight polyethylene and 1-5 parts of ethylene-propylene-based compatilizer; The PP-R resin is III type random copolymer polypropylene, and the PP-B resin is propylene-ethylene block copolymer; The polymer grafted maleic anhydride compatilizer comprises a PP grafted maleic anhydride compatilizer or a POE grafted maleic anhydride compatilizer, and the ethylene-propylene-based compatilizer is ethylene-propylene-based binary copolymer or ethylene-propylene-based multipolymer.
  2. 2. The synergistic composite toughening modified PP-R tubing material of claim 1, wherein the elastomeric toughening agent is one or more of POE, POP, and OBC.
  3. 3. The synergistic composite toughening modified PP-R tubing material of claim 2, wherein the ethylene content in the POP is less than or equal to 20wt%.
  4. 4. The preparation method of the synergistic composite toughening modified PP-R pipe material according to any one of claims 1 to 3, which is characterized by comprising the following steps: Blending the PP-R resin, the elastomer toughening agent and the polymer grafted maleic anhydride compatilizer, and sequentially carrying out first extrusion stretching and granulation to obtain the PP-elastomer toughening agent; blending PP-R resin, PP-B resin, metallocene polyethylene, ultra-high molecular weight polyethylene and ethylene-propylene compatilizer, and then sequentially carrying out second extrusion stretching and granulation to obtain a PP-PE toughening agent; Premixing the PP-elastomer toughening agent, the PP-PE toughening agent and the PP-R resin, and sequentially carrying out third extrusion stretching and granulation to obtain the synergistic composite toughening modified PP-R pipe material.
  5. 5. The method according to claim 4, wherein the first extrusion stretching is performed at a screw extrusion speed of 30-80 r/min and a screw extrusion temperature of 180-250 ℃.
  6. 6. The method according to claim 4, wherein the second extrusion stretching is performed at a screw extrusion speed of 30-80 r/min and a screw extrusion temperature of 180-230 ℃.
  7. 7. The method according to claim 4, wherein the third extrusion stretching is performed at a screw extrusion speed of 30-80 r/min and a screw extrusion temperature of 180-230 ℃.
  8. 8. The application of the synergistic composite toughening modified PP-R pipe material prepared by the preparation method of any one of claims 1-3 or any one of claims 4-7 in the preparation of PP-R pipes.

Description

Synergistic composite toughened PP-R pipe material and preparation method and application thereof Technical Field The invention relates to the technical field of PP pipes, in particular to a synergistic composite toughening PP-R pipe material and a preparation method and application thereof. Background The polypropylene (PP) has the advantages of rich raw material sources, low price, small density, high strength, good electrical insulation, easy processing and forming and the like compared with other general plastics (PVC, PE, PS). Is widely applied to the fields of daily necessities, packages, building materials and the like. In particular, random copolymer polypropylene (PP-R) is the main production category of PP. The PP-R pipe is one of cold and hot water conveying pipelines mainly used in buildings such as municipal works, residential houses and commercial office buildings at present, and the polypropylene pipe also becomes one of main basic materials in the pipeline application field of China. The PP-R pipe has light weight, high strength, greatly reduced construction strength, high pressure resistance experiment strength up to more than 5MPa, excellent corrosion resistance, abrasion resistance and no scaling performance, belongs to polyolefin, has no toxicity and sanitation and environmental protection because only carbon and hydrogen elements exist in molecules, has heat resistance and heat preservation, has the maximum use temperature of 95 ℃ and the long-term use temperature of 60 ℃, is used for hot water and heating systems, can save a large amount of energy sources, and has the normal service life of more than 50 years. However, since PP is a high isotacticity, semi-crystalline large spherulitic polymer, the product has defects such as low notched impact strength and increased brittleness at low temperature. Research methods for toughening modification of PP materials have been attracting attention, and various toughening methods have been reported in order to improve the defects in PP performance, wherein elastomer toughening modification has been considered as one of the most effective approaches. Polyolefin elastomer (POE) is an ethylene-octene copolymer, which has excellent combination properties due to its unique molecular structure, good flowability, corrosion resistance, excellent air permeability and excellent low temperature resistance, and is therefore most commonly used for improving the low temperature brittleness problem of PP. However, when PP is used as a pipeline material, the toughness at low temperature is improved and the good rigidity of the PP is not reduced, but the toughness is sacrificed by the toughening modification of the PP of the elastomer. In addition, the performances of the PP and the elastomer are different to a certain extent, so that the elastomer is easy to form large-range uneven dispersion in the PP during blending modification, the modulus and impact property of the material are reduced, an ideal result is not achieved, and the low-temperature toughness effect of a finished product is not remarkably improved. Disclosure of Invention The invention aims to provide a synergistic composite toughened PP-R pipe material, a preparation method and application thereof, wherein the synergistic composite toughened PP-R pipe material has excellent low-temperature toughness and high impact strength. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a synergistic composite toughening modified PP-R pipe material, which comprises the following preparation raw materials in parts by weight: 70-85 parts of PP-R resin, 10-20 parts of PP-elastomer toughening agent and 5-10 parts of PP-PE toughening agent; the PP-elastomer toughening agent is prepared from 75-94 parts of PP-R resin, 5-20 parts of elastomer toughening agent and 1-5 parts of polymer grafted maleic anhydride compatilizer; the PP-PE toughening agent is prepared from 75-92 parts of PP-R resin, 1-5 parts of PP-B resin, 5-10 parts of metallocene polyethylene, 1-5 parts of ultra-high molecular weight polyethylene and 1-5 parts of ethylene-propylene-based compatilizer. Preferably, the PP-R resin is III type random copolymer polypropylene, and the PP-B resin is propylene-ethylene block copolymer. Preferably, the elastomer toughening agent is one or more of POE, POP and OBC. Preferably, in the POP, the ethylene content is less than or equal to 20wt%. Preferably, the polymer grafted maleic anhydride compatilizer comprises a PP grafted maleic anhydride compatilizer or a POE grafted maleic anhydride compatilizer, and the ethylene-propylene-based compatilizer is ethylene propylene-based binary copolymer or ethylene propylene-based multipolymer. The invention provides a preparation method of a synergistic composite toughening modified PP-R pipe material, which comprises the following steps: Blending the PP-R resin, the elastomer toughening agent and th