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PP-RCT special material with high beta crystal content, pipe and preparation methods of PP-RCT special material and pipe

A technology of PP-RCT and special materials, which is applied in the field of PP-RCT special materials and pipes and their preparation, can solve the problems of PP-RCT special materials with high β crystal content, etc., and achieve good toughness, excellent impact resistance and Effects of heat resistance and high β-crystal content

Active Publication Date: 2022-05-13
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common brand of PPR is still the most used in the downstream market. Due to the restriction of imported raw materials, there is currently no PP-RCT special material with high β crystal content in China.

Method used

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  • PP-RCT special material with high beta crystal content, pipe and preparation methods of PP-RCT special material and pipe
  • PP-RCT special material with high beta crystal content, pipe and preparation methods of PP-RCT special material and pipe
  • PP-RCT special material with high beta crystal content, pipe and preparation methods of PP-RCT special material and pipe

Examples

Experimental program
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Effect test

Embodiment 1-4 and comparative example 1-4

[0050] 1. The PPR pipes with high β crystal content of each embodiment and each comparative example are prepared according to the following steps:

[0051] 1) Stir the β-nucleating agent in a high mixer at a speed of 900-960 rpm until the temperature reaches 80°C, add the WT treatment agent, then stir at a speed of 900-960 rpm until the temperature reaches 100°C, cool , to prepare a modified β-nucleating agent, the mass fraction ratio of the WT treatment agent and the β-nucleating agent is 1:(40-50).

[0052] 2) According to weight percentage, weigh 88.5wt%~95.3wt% of homopolypropylene, 2wt%~5wt% of ethylene-octene copolymer, 2wt%~5wt% of the modified β nucleating agent, 0.2 Wt%-0.5wt% of lubricant, and 0.5wt%-1wt% of antioxidant, mixed uniformly, put into extruder to extrude, cooled, pelletized, that is, the modified β-nucleating agent master pellets; the barrel temperature range of the extruder is 170-190°C, and the screw speed is 300-400rpm.

[0053] The melt index of the...

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Abstract

The invention discloses a PP-RCT special material with high beta crystal content, a pipe and preparation methods of the PP-RCT special material and the pipe. The preparation method of the PP-RCT special material comprises a step of preparing the modified beta nucleating agent master batch and a step of preparing the PP-RCT special material. The modified beta nucleating agent master batch comprises a WT treatment agent and a beta nucleating agent. The beta nucleating agent is one of p-benzene aromatic amic acid metal salts; the compound contains an amido functional group and a carboxylic acid functional group; the WT treatment agent is a surfactant containing a plurality of metal acid ester pyrophosphate central metal atoms and a plurality of light rare earth element active centers, the central metal atoms are Ti, Al or Zr, and the light rare earth elements are lanthanum, cerium, praseodymium or rubidium. The PPR pipe prepared by extruding the special PP-RCT material with high beta crystal content prepared by the preparation method through a single screw extruder has high beta crystal content, the beta crystal conversion rate is greater than 80%, and the special PP-RCT material has excellent impact resistance and heat resistance.

Description

technical field [0001] The invention relates to the technical field of PP-RCT special materials, in particular to a PP-RCT special material and pipe material with high β-crystal content and a preparation method thereof. Background technique [0002] Random copolymerized polypropylene (PPR) is widely used as the third-generation pipe due to its strong creep resistance, good strength and rigidity. However, in the process of use, there are disadvantages such as brittleness at low temperature, poor pressure resistance at high temperature, and large thermal expansion coefficient. [0003] In the newly revised national standard GB / T18742 "Polypropylene Piping System for Hot and Cold Water", new standards for PP-RCT pipes and β-PPH pipes have been added, clearly stating that PP-RCT is PP-R with improved crystallization. [0004] PP-RCT material is a random copolymerized polypropylene with high heat resistance, pressure resistance, toughness and other characteristics, that is, four...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08L23/12C08L23/08C08K5/20C08K5/00C08J3/22
CPCC08L23/142C08J3/226C08L2203/18C08L2205/242C08J2323/14C08J2423/12C08J2423/08C08L23/12C08L23/0815C08K5/20C08K5/0091
Inventor 江焕峰吴波郑贤周杨许文杰郑德任颜卫冷海强黄玉松
Owner SOUTH CHINA UNIV OF TECH
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