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Low-temperature PPR (Polypropylene Random Copolymer) pipe

A low temperature, ambient temperature technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problems of short service life of PPR pipes, and achieve the effects of strong toughness, cost saving, and high low temperature resistance

Inactive Publication Date: 2013-04-03
南京联塑科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the short life of PPR pipes in low temperature environment, the present invention proposes a low temperature PPR pipe, which adopts the method of compound modification of polyethylene and elastomer, and effectively improves the pipe quality while maintaining the original advantages of PPR pipes. low temperature toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The low temperature resistant PPR pipe adopts the following formula: PPR resin: 100 parts, LLDPE: 8 parts, ethylene-propylene rubber: 8 parts. Weigh the material according to the above ratio, then put it into the mixer and mix it well, and then extrude the obtained mixture into a pipe with dn20x2.3mm in the extruder, then vacuum calibrate and cool to shape.

[0015] The tensile strength and impact strength of the pipes produced according to the above formulations increased, but the flexural strength decreased. After testing, the shrinkage rate can reach 110%, and there is no crack but deformation when a certain weight is impacted, and the bending strength is slightly weaker than ordinary PPR pipes.

Embodiment 2

[0017] The formula of low temperature resistant PPR pipe is: PPR resin: 100 parts, LLPE100: 10 parts, ethylene-octene copolymer: 5 parts. Weigh the material according to the above ratio, then put it into the mixer and mix it well, and then extrude the obtained mixture into a pipe with dn20x2.3mm in the extruder, then vacuum calibrate and cool to shape.

[0018] The tensile strength and impact strength of the pipes produced according to the above formulations increased, but the flexural strength decreased. The shrinkage rate can reach 120%, and there is no crack, deformation and rebound when the same weight is impacted, and the bending strength is weaker than that of the pipe in Example 1.

Embodiment 3

[0020] The low temperature resistant PPR pipe adopts the formula: PPR resin: 100 parts, HDPE: 1 part, EPDM rubber: 20 parts. Weigh the material according to the above ratio, then put it into the mixer and mix it well, and then extrude the obtained mixture into a pipe with dn20x2.3mm in the extruder, then vacuum calibrate and cool to shape.

[0021] The tensile strength and impact strength of the pipes produced according to the above formulations increased, but the flexural strength decreased. The shrinkage rate can reach 125%, and there is no crack, deformation and rebound when the same weight is impacted, and the bending strength is weaker than that of the pipe in Example 1.

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Abstract

The invention provides a low-temperature PPR (Polypropylene Random Copolymer) pipe which is prepared by uniformly mixing PPR resin, polyethylene and an impact modifier in a certain proportion as raw materials, and extruding by an extruding production line, wherein the weight parts of the PPR resin, the polyethylene and the impact modifier are as follows: 100 parts of the PPR resin, 1-20 parts of the polyethylene and 1-20 parts the impact modifier. The low-temperature PPR pipe disclosed by the invention has higher low-temperature resistance, does not become fragile at a low-temperature environment and can be used at a temperature in a range of minus 10 DEG C to 95 DEG C. The low-temperature PPR pipe has the characteristics of strong toughness, impact resistance, pressure resistance, obvious low-temperature resistance and the like; the application range is greater than that of a common PPR pipe; and the low-temperature PPR pipe adapts to various complicated environments and the cost is saved.

Description

technical field [0001] The invention relates to the field of plastic pipes for construction engineering, in particular to a low-temperature PPR pipe. Background technique [0002] PPR pipe, that is, random copolymerized polypropylene pipe, is a new type of plastic pipe product developed and applied in Europe in the early 20th century. It has the advantages of light weight, high strength, corrosion resistance, no scaling, and long service life. It is mainly used in building cooling. Hot water system, drinking water system and panel heating system, etc. However, the low temperature resistance of PPR pipe is poor, and it is easy to burst and other phenomena in the environment below 5°C, which seriously affects the service life of the pipe in low temperature environment. Contents of the invention [0003] In order to overcome the short life of PPR pipes in low temperature environment, the present invention proposes a low temperature PPR pipe, which adopts the method of compou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/06C08L23/08C08L23/16C08K3/26C08K3/34F16L9/12
Inventor 蓝子全
Owner 南京联塑科技实业有限公司
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