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A low-temperature cracking-resistant PPR pipe with controllable crystal form and preparation method thereof

A technology of low temperature resistance and crystal form regulation, applied in the field of pipe preparation, can solve problems affecting the safe production of PPR pipes, life needs, construction and installation of PPR pipes, and hot water pressure resistance of pipes, etc., to ensure melt strength , Guarantee the effect of reducing the strength and rigidity

Active Publication Date: 2017-07-21
ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high brittleness of PPR pipes at low temperatures (5-10°C), stress-induced cracking is very easy to occur, which has seriously affected the construction and installation of PPR pipes for many years, and seriously affected the safety of PPR pipes in water delivery systems at low temperatures. and people's daily production and living needs, it is urgent to make great efforts to solve them
[0004] At present, the commonly used improvement method in the industry is formula modification. Summarizing the technical solutions for formula improvement in the industry, the results are all unsatisfactory. They are all in the research stage and have not been applied in the market.
The analysis is as follows: 1) Nano-particle filling modification: the impact effect on PPR pipes at room temperature is obvious, but it does not contribute much to low-temperature impact; 2) Elastomer modification: the impact property is greatly improved, and there are problems such as poor compatibility, sacrificing The pressure resistance of the pipe has no application value; 3) PPB blend modification: it affects the hot water pressure resistance of the pipe and affects the life of the pipe, which is not advisable

Method used

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  • A low-temperature cracking-resistant PPR pipe with controllable crystal form and preparation method thereof
  • A low-temperature cracking-resistant PPR pipe with controllable crystal form and preparation method thereof
  • A low-temperature cracking-resistant PPR pipe with controllable crystal form and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Preparation of low temperature cracking resistant PPR pipe with controllable crystal form

[0029] The present invention will be further described below in conjunction with embodiment:

[0030] Example 1: Preparation of low temperature cracking resistant PPR pipe with controllable crystal form

[0031] 1) Preparation of anti-cracking modifier masterbatch at low temperature

[0032] a Preparation of micro-crosslinked LLDPE masterbatch: Stir 0.4 kg of antioxidant 1010, 0.5 kg of di-(tert-butylperoxyisopropyl) benzene and 500 ml of acetone with a glass rod until they are completely dissolved, and then pour the dissolved Stir in 40 kg of linear low-density polyethylene LLDPE, the stirring speed is 70 rpm, after stirring for 300S, the material is unloaded, and it is placed for 3 hours. After the acetone volatilizes, the material is poured into the twin-screw to melt and extrude to produce a micro-crosslinking reaction. LLDPE masterbatch with a certain degree of ...

Embodiment 2

[0038] Example 2: Preparation of low temperature cracking resistant PPR pipe with controllable crystal form

[0039] 1) Preparation of anti-cracking modifier masterbatch at low temperature

[0040] a Stir 0.42 kg of antioxidant 1010, 0.55 kg of di-(tert-butylperoxyisopropyl) benzene and 500 ml of acetone with a glass rod until they are all dissolved, then pour the dissolved substance into 40 kg of linear low-density polyethylene LLDPE Stirring, the stirring speed is 70 rpm, stirring for 300S, then feeding, and standing for 3 hours, after the acetone volatilizes, the material is poured into the twin-screw, melted and extruded to produce a micro-crosslinking reaction, and the LLDPE parent material with a certain degree of crosslinking is obtained. grain. The temperature setting of each zone of the twin-screw extruder is: 100°C for the first stage, 120°C for the second stage, 145°C for the third stage, 145°C for the fourth stage, 150°C for the fifth stage, 150°C for the sixth st...

Embodiment 3

[0046] Example 3: Preparation of low-temperature cracking-resistant PPR pipe with controllable crystal form

[0047] 1) Preparation of anti-cracking modifier masterbatch at low temperature

[0048] a Stir 0.38 kg of antioxidant 1010, 0.45 kg of bis-(tert-butylperoxyisopropyl) benzene and 450 ml of acetone with a glass rod until they are completely dissolved, then pour the dissolved substance into 40 kg of linear low-density polyethylene LLDPE Stirring, the stirring speed is 70 rpm, stirring for 280S, then feeding, and standing for 3 hours, after the acetone volatilizes, the material is poured into the twin-screw, melted and extruded to produce a micro-crosslinking reaction, and the LLDPE parent material with a certain degree of crosslinking is obtained. grain. The temperature setting of each zone of the twin-screw extruder is: 100°C for the first stage, 125°C for the second stage, 155°C for the third stage, 155°C for the fourth stage, 155°C for the fifth stage, 160°C for the ...

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Abstract

The invention discloses a cold-cracking resistant PPR pipeline with a controllable crystal form, and belongs to the technical field of tubular product preparation. The cold-cracking resistant PPR pipeline comprises the following components in parts by weight: 100 parts of PPR, 4 parts of color master batches, 4-6 parts of a cold-cracking resistant modifier, 2-4 parts of a crystal form regulating agent, 1-3 parts of an antioxidant and 0.2-1 part of a light stabilizer, and is obtained by stirring evenly, extruding and pelletizing. The method comprises the following steps: by virtue of a melt extrusion reaction grafting technology, grafting a polyethylene molecule on a polypropylene molecule skeleton as a long-chain tie molecule to obtain a polyethylene cold-cracking resistant modifier; codoping into PPR resin together with the crystal form regulating agent; extruding a PPR modified tubular product; and carrying out internal stress removal treatment on the tubular product. The spherocrystal dimension and distribution of polyethylene in the molding and processing processes can be regulated and controlled by combination of two master batches; the brittleness and stress cracking character of the polyethylene can be significantly improved; and compared with a common PPR tubular product, the cold-cracking resistance can be improved by 20%.

Description

technical field [0001] The invention belongs to the technical field of pipe material preparation, and in particular relates to a low-temperature cracking-resistant PPR pipe with controllable crystal form and a preparation method thereof. Background technique [0002] Random copolymerized polypropylene pipe (PPR pipe) has been introduced into my country in 1997 and has been more and more favored by people for its excellent heat resistance, impact resistance and green building material concept. The drainage system has been greatly developed. [0003] Due to the high brittleness of PPR pipes at low temperatures (5-10°C), stress-induced cracking is very easy to occur, which has seriously affected the construction and installation of PPR pipes for many years, and seriously affected the safety of PPR pipes in water delivery systems at low temperatures. and people's daily production and living needs, it is urgent to make great efforts to solve them. [0004] At present, the common...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L23/08C08L23/06C08K13/02C08K5/14C08K5/103C08K3/26C08K5/40B29C47/92B29C48/92
CPCB29C48/92B29C2948/92514B29C2948/9259B29C2948/92704C08J3/226C08J2323/12C08J2323/14C08J2423/06C08J2423/08C08K2201/011C08K2201/014C08L23/14C08L2203/18C08L2205/025C08L2205/035C08L23/0815C08L23/12C08L23/06C08K13/06C08K9/04C08K2003/265C08K5/1345C08K5/526C08K5/40C08K5/14
Inventor 高莉陆国强胡正华
Owner ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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