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Annealing process for polypropylene random copolymer (PP-R) pipes

A random copolymerization, PP-R technology, applied in the direction of tubular articles, other household appliances, household appliances, etc., can solve the problems of brittle cracking of PP-R pipes, improve crystallization defects, improve pressure resistance, and simple steps. Effect

Active Publication Date: 2016-01-20
浙江中财管道科技股份有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, to provide a random copolymer polypropylene (PP-R) pipe annealing process, which aims to solve the brittle cracking of PP-R pipes in the prior art at low temperature, etc. technical problem

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0021] The embodiment of the present invention provides a random polypropylene copolymer (PP-R) pipe annealing process, comprising the following steps:

[0022] Step 1, the first heat treatment, send the off-line PP-R pipe rack to the drying car, and the operator pushes the drying car loaded with PP-R pipes into the first drying room for the first heat treatment, The temperature of the first drying roo...

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Abstract

The invention discloses an annealing process for polypropylene random copolymer (PP-R) pipes. The process includes the following steps of five times of heating treatments and cooling treatment, wherein the temperature of the first and second times of heating treatments is controlled to be lower than 100 DEG C, and the heating treatment time is controlled to be about two hours, so that the problem of pipe deformation caused by excessively high temperature and too long time is prevented; the temperature of the third and fourth times of heating treatments is controlled to be lower than 125 DEG C, the heating treatment time is controlled to be about one hour, and internal stress caused by PP-R interior molecular crystallization during pipe production is eliminated or reduced; the temperature of the fifth time of heating treatment is controlled to be lower than 100 DEG C, the heating treatment time is controlled to be about 0.5 hour, the secondary internal stress caused during annealing is avoided or reduced, the problems of pipe contraction, bending and deformation caused by too large temperature difference are reduced, the problem that low-temperature brittle cracking and the like are prone to happen to existing PP-R pipes is solved, and the production quality of the PP-R pipes is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of pipe production, in particular to an annealing process for random copolymerized polypropylene (PP-R) pipes. 【Background technique】 [0002] Random copolymerized polypropylene pipes are referred to as PP-R pipes, which are the third generation of new polypropylene pipes after PP-H and PP-B pipes. PP-R pipe has become one of the main products to replace galvanized steel pipe due to its excellent impact resistance, corrosion resistance and high temperature resistance, good pressure resistance, heat preservation and aging resistance, hygiene and non-toxicity, convenient installation and beautiful appearance. one. PP-R pipes will not cause adverse effects on the human body and the environment in the process of raw material production, molding processing, use and waste recycling, so it is known as "green environmental protection pipe". In recent years, PP-R pipes have become more and more popular home impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C71/02B29L23/00
Inventor 陈增贵陈建春张承榜
Owner 浙江中财管道科技股份有限公司
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