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A kind of fractional crystallization method for extruding β crystal ppr pipe

A technology of fractional crystallization and β crystal form, applied in the direction of tubular articles, applications, household appliances, etc., can solve problems such as inhibiting α crystal, and achieve the effect of improving production efficiency and quality

Active Publication Date: 2017-11-17
ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a β-nucleating agent can slightly widen this temperature range, to some extent inhibit the formation of α-crystals and induce the formation of β-crystals, but cannot inhibit the formation of α-crystals during the entire crystallization process

Method used

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  • A kind of fractional crystallization method for extruding β crystal ppr pipe
  • A kind of fractional crystallization method for extruding β crystal ppr pipe
  • A kind of fractional crystallization method for extruding β crystal ppr pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: The PPR raw material (produced by Daqing Refining and Chemical Company, brand PA14D) is heated and sheared in an extruder until the raw material is completely melted and plasticized. The barrel temperature of the extruder is 220 ° C, and the die head temperature is 230 ℃. Then the pipes are drawn into the vacuum sizing cooling water tank at a pulling speed of 10 meters per minute, the length of the water tank is 2 meters, the temperature of the cooling water tank is 20°C, and the residence time is 12s. The pipe is then passed through a continuous insulation sleeve. The length of the insulation casing is 20 meters, the temperature inside the insulation casing is maintained at 60-120°C, and the residence time is 120s. Finally, the pipe is cooled by cooling water tank, cut and packed. The length of the cooling water tank is 6 meters, the temperature of the cooling water is 20°C, and the residence time is 36s.

Embodiment 2

[0044] Embodiment 2: Beta ~ PPRTMRA7050 ~ GN raw material produced by Borealis is heated and sheared in an extruder until the raw material is completely melted and plasticized. The barrel temperature of the extruder is 220° C., and the die head temperature is 235°C. Then the pipes are put into the vacuum sizing cooling water tank at a pulling speed of 11 meters per minute, the length of the water tank is 2 meters, the temperature of the cooling water is 20°C, and the residence time is 11s. Then the pipe is passed through a continuous cooling water tank with a length of 26 meters, the temperature of the cooling water is 20°C, and the residence time is 142s. Finally, it is cut and packaged.

Embodiment 3

[0045] Embodiment 3: Beta ~ PPRTMRA7050 ~ GN raw material produced by Borealis is heated and sheared in an extruder until the raw material is completely melted and plasticized. The barrel temperature of the extruder is 210° C., and the die head temperature is 220°C. Then the pipes are respectively fed into the vacuum sizing cooling water tank at a traction speed of 10 meters per minute, the length of the water tank is 2 meters, the temperature of the cooling water tank is 20°C, and the residence time is 12s respectively. Then the pipe is passed through a continuous cooling water tank with a length of 26 meters, the temperature of the cooling water is 20°C, and the residence time is 156s. Finally, it is cut and packaged.

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Abstract

The invention discloses a step-by-step crystallization method for extruding a β-crystal PPR pipe, which is characterized in that it comprises: melting and extruding a PPR resin raw material containing a β-nucleating agent at high temperature, and determining the extruded pipe blank. Diameter; the tube blank after sizing is subjected to the first rapid cooling at the first cooling rate; the tube blank is subjected to slow cooling at the second cooling rate; the tube blank is subjected to the second rapid cooling at the third cooling rate; among them , the second cooling rate is lower than the first cooling rate and the third cooling rate, and the temperature range for slow cooling is 60-120°C.

Description

technical field [0001] The invention relates to the production technology of plastic pipes, in particular to a fractional crystallization method for extruding β-crystal PPR pipes. Background technique [0002] Since the early 1990s, PPR (polypropylene random) pipes have been widely used in construction-related fields due to their advantages of energy saving, environmental protection, light weight, high strength, corrosion resistance, and long service life. However, with the continuous improvement of consumers' requirements for product quality in recent years, the toughness of PPR pipes needs to be further improved. As we all know, PPR can generate three crystal forms of α, β, and γ, among which the α crystal form is the most stable, and both the β and γ crystal forms are in a metastable state. When the PPR pipe has a higher β crystal content, the purpose of toughening modification can be achieved. [0003] To obtain a high content of β-crystal material, there are mainly te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/00B29C47/88B29C47/92B29K23/00B29L23/00B29C48/09B29C48/04B29C48/91B29C48/92
CPCB29C48/92B29C48/09B29C48/9115B29C2948/92704B29K2023/12B29L2023/22B29C48/04B29C48/91B29C48/913B29C48/918B29C48/919B29C48/905
Inventor 孙启杭陈国贵冯金茂张伟娇高莉
Owner ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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