CN105252793A - Annealing process for polypropylene random copolymer (PP-R) pipes - Google Patents
Annealing process for polypropylene random copolymer (PP-R) pipes Download PDFInfo
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- CN105252793A CN105252793A CN201510562833.1A CN201510562833A CN105252793A CN 105252793 A CN105252793 A CN 105252793A CN 201510562833 A CN201510562833 A CN 201510562833A CN 105252793 A CN105252793 A CN 105252793A
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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]
The present invention relates to the technical field that tubing is produced, particularly a kind of atactic copolymerized polypropene (PP-R) tubing annealing process.
[background technology]
Random copolymerization polypropylene pipe is called for short PP-R pipe, is the third generation Novel polypropylene tubing after PP-H, PP-B tubing.PP-R pipe is with the shock-resistant, corrosion-resistant of its excellence and resistance to elevated temperatures, and good withstand voltage, insulation and ageing-resistant performance and the feature such as health is nontoxic, easy for installation, specious, become one of major product of alternative coating steel pipe.PP-R pipe in raw material production, processing and forming, use and all can not cause adverse influence to human body and environment in discarded removal process, be therefore described as " environmental protection tubing ".In recent years, PP-R pipe, with its easy construction, long service life, cost performance advantages of higher, becomes more and more welcome building materials of house fitting-up.But there is the problem of black brittleness in existing PP-R pipe in the market, PP-R pipe there will be the quality problems such as tubing brittle cracking in low temperature use procedure, cause scrapping of tubing, bring constant to the life of user, reduce PP-R pipe product in consumer's prestige in the heart and public praise, in order to improve, PP-R pipe is low temperature resistant, frost-cracking-preventing, also can there is the performance of higher intensity and anti-brittle cracking at low ambient temperatures, be necessary to propose a kind of atactic copolymerized polypropene (PP-R) tubing annealing process.
[summary of the invention]
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of atactic copolymerized polypropene (PP-R) tubing annealing process, it is intended to the technical problems such as the brittle cracking that in solution prior art, PP-R pipe occurs when low temperature.
For achieving the above object, the present invention proposes a kind of atactic copolymerized polypropene (PP-R) tubing annealing process, comprise the following steps:
Step one, first heat, and delivered to by the PP-R pipe frame rolled off the production line and dry on car, the baking car being loaded with PP-R pipe is pushed the first drying room by operative employee, carries out first heating, and the temperature of the first drying room controls below 100 DEG C, and the heat time is about 2h;
Step 2, second heat, and the PP-R pipe after first heats being proceeded to the second drying room by drying car, carrying out second heating, the temperature of the second drying room controls below 100 DEG C, and the heat time is about 1h;
Step 3, the 3rd road heat, and the PP-R pipe after second heats is proceeded to the 3rd drying room by drying car, and carry out the 3rd road and heat, the temperature of the 3rd drying room controls below 125 DEG C, and the heat time is about 30min;
Step 4, the 4th road heat, and the PP-R pipe after the 3rd road heats is proceeded to the 4th drying room by drying car, and carry out the 4th road and heat, the temperature of the 4th drying room controls below 125 DEG C, and the heat time is about 1h;
Step 5, the 5th road heat, and the PP-R pipe after the 4th road heats is proceeded to the 5th drying room by drying car, and carry out the 5th road and heat, the temperature of the 5th drying room controls below 100 DEG C, and the heat time is about 30min;
Step 6, cooling processing, send the 5th drying room by the PP-R pipe frame after step 5 the 5th road heats, and carry out cooling processing in a dry environment.
As preferably, in described step one, the temperature of the first drying room controls at 70 ~ 75 DEG C, and first heating treatment time is 70 ~ 80min.
As preferably, in described step 2, the temperature of the second drying room controls at 90 ~ 95 DEG C, and second heating treatment time is 40 ~ 50min.
As preferably, in described step 3, the temperature of the 3rd drying room controls at 100 ~ 105 DEG C, and the 3rd road heating treatment time is 20 ~ 30min.
As preferably, in described step 4, the temperature of the 4th drying room controls at 115 ~ 125 DEG C, and the 4th road heating treatment time is 30 ~ 40min.
As preferably, in described step 5, the temperature of the 5th drying room controls at 90 ~ 100 DEG C, and the 5th road heating treatment time is 25 ~ 30min.
As preferably, the temperature of described first drying room, the second drying room, the 3rd drying room, the 4th drying room, the 5th drying room is controlled by temperature controller respectively and regulates.
As preferably, on described baking car, the spacing of adjacent PP-R pipe is 3 ~ 4cm, controls PP-R pipe uniform rotation in particular during a heating process by baking car.
Beneficial effect of the present invention: compared with prior art, a kind of atactic copolymerized polypropene (PP-R) tubing annealing process provided by the invention, step is simple, annealing process is carried out to the PP-R pipe rolled off the production line, annealing process adopts the heating mode of five-part form, and first and second road heat treatment temperature controls below 100 DEG C, heating treatment time controls at 2 hours, prevents due to the too high overlong time of temperature and causes pipe deformations problem, third and fourth road heat treatment temperature controls below 125 DEG C, and heating treatment time controls at 1 hours, eliminates or reduces in tubing production process, the internal stress that inside produces because of PP-R molecular crystalline, 5th road heat treatment temperature controls below 100 DEG C, heating treatment time controls at 0.5 hours, prevent or reduce the internal stress that in annealing process, secondary produces, and the tubing reducing excessive temperature differentials generation shrinks flexural deformation problem, compared with existing production technology, increase annealing process provided by the invention, effectively can reduce or substantially eliminate tubing and to roll off the production line the internal stress do not discharged completely in cooling procedure, tubing can carry out secondary crystallization, effectively can improve the crystal defect that tubing inside and outside wall brings because inhomogeneous cooling is even, improve tubing apparent mass, improve the black brittleness of tubing, improve withstand voltage properties.
Feature of the present invention and advantage will be described in detail by embodiment.
[detailed description of the invention]
For making the object, technical solutions and advantages of the present invention clearly understand, below by accompanying drawing and embodiment, the present invention is further elaborated.But should be appreciated that, specific embodiment described herein, only in order to explain the present invention, is not limited to scope of the present invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
The embodiment of the present invention provides a kind of atactic copolymerized polypropene (PP-R) tubing annealing process, comprises the following steps:
Step one, first heat, and delivered to by the PP-R pipe frame rolled off the production line and dry on car, the baking car being loaded with PP-R pipe is pushed the first drying room by operative employee, carries out first heating, and the temperature of the first drying room controls below 100 DEG C, and the heat time is about 2h;
Step 2, second heat, and the PP-R pipe after first heats being proceeded to the second drying room by drying car, carrying out second heating, the temperature of the second drying room controls below 100 DEG C, and the heat time is about 1h;
Step 3, the 3rd road heat, and the PP-R pipe after second heats is proceeded to the 3rd drying room by drying car, and carry out the 3rd road and heat, the temperature of the 3rd drying room controls below 125 DEG C, and the heat time is about 30min;
Step 4, the 4th road heat, and the PP-R pipe after the 3rd road heats is proceeded to the 4th drying room by drying car, and carry out the 4th road and heat, the temperature of the 4th drying room controls below 125 DEG C, and the heat time is about 1h;
Step 5, the 5th road heat, and the PP-R pipe after the 4th road heats is proceeded to the 5th drying room by drying car, and carry out the 5th road and heat, the temperature of the 5th drying room controls below 100 DEG C, and the heat time is about 30min;
Step 6, cooling processing, send the 5th drying room by the PP-R pipe frame after step 5 the 5th road heats, and carry out cooling processing in a dry environment.
In described step one, the temperature of the first drying room controls at 70 ~ 75 DEG C, and first heating treatment time is 70 ~ 80min, and in described step 2, the temperature of the second drying room controls at 90 ~ 95 DEG C, and second heating treatment time is 40 ~ 50min.
Further, first heating and second heating can prevent due to the too high overlong time of temperature and cause pipe deformations problem.
In described step 3, the temperature of the 3rd drying room controls at 100 ~ 105 DEG C, and the 3rd road heating treatment time is 20 ~ 30min, and in described step 4, the temperature of the 4th drying room controls at 115 ~ 125 DEG C, and the 4th road heating treatment time is 30 ~ 40min.
Further, the 3rd road heating and the 4th road heat and can eliminate or reduce in tubing production process, the internal stress that inside produces because of PP-R molecular crystalline.
In described step 5, the temperature of the 5th drying room controls at 90 ~ 100 DEG C, and the 5th road heating treatment time is 25 ~ 30min.
Further, the 5th road heats can prevent or reduce the internal stress that in annealing process, secondary produces, and the tubing reducing excessive temperature differentials generation shrinks flexural deformation problem.
The temperature of described first drying room, the second drying room, the 3rd drying room, the 4th drying room, the 5th drying room is controlled by temperature controller respectively and regulates, on described baking car, the spacing of adjacent PP-R pipe is 3 ~ 4cm, controls PP-R pipe uniform rotation in particular during a heating process by baking car.
Further, the spacing of adjacent PP-R pipe is 3 ~ 4cm, and controls PP-R pipe uniform rotation by baking car in particular during a heating process, PP-R pipe can be made fully to be heated, and be heated evenly, improve the quality heated.
Test:
The PP-R pipe of the embodiment of the present invention being produced carries out tubing falling weight impact test with the PP-R pipe of producing without a kind of atactic copolymerized polypropene (PP-R) tubing annealing process provided by the invention, test ambient temperature controls at-5 DEG C, the quality of weight is 2.5kg, the elemental height of weight is 2m, and test procedure is all identical.
Obtain through test data analyzer, the PP-R pipe of comparatively producing without a kind of atactic copolymerized polypropene (PP-R) tubing annealing process provided by the invention through the hydrostatic performance of short-term of the PP-R pipe of a kind of atactic copolymerized polypropene (PP-R) tubing annealing process production provided by the invention improves more than 10%, and tubing falling weight impact test comparatively improves more than 60% without a kind of atactic copolymerized polypropene (PP-R) tubing provided by the invention.As can be seen here, the quality problems such as the brittle cracking that the PP-R pipe that a kind of atactic copolymerized polypropene (PP-R) tubing lehr attendant artistic skill provided by the invention solves the production of existing production technology occurs when low temperature, increase annealing process provided by the invention, effectively can reduce or substantially eliminate tubing and to roll off the production line the internal stress do not discharged completely in cooling procedure, tubing can carry out secondary crystallization, effectively can improve the crystal defect that tubing inside and outside wall brings because inhomogeneous cooling is even, improve PP-R pipe apparent mass, improve the black brittleness of tubing, improve withstand voltage properties, greatly improve the quality of production of PP-R pipe.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement or improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. atactic copolymerized polypropene (PP-R) tubing annealing process, is characterized in that: comprise the following steps:
Step one, first heat, and delivered to by the PP-R pipe frame rolled off the production line and dry on car, the baking car being loaded with PP-R pipe is pushed the first drying room by operative employee, carries out first heating, and the temperature of the first drying room controls below 100 DEG C, and the heat time is about 2h;
Step 2, second heat, and the PP-R pipe after first heats being proceeded to the second drying room by drying car, carrying out second heating, the temperature of the second drying room controls below 100 DEG C, and the heat time is about 1h;
Step 3, the 3rd road heat, and the PP-R pipe after second heats is proceeded to the 3rd drying room by drying car, and carry out the 3rd road and heat, the temperature of the 3rd drying room controls below 125 DEG C, and the heat time is about 30min;
Step 4, the 4th road heat, and the PP-R pipe after the 3rd road heats is proceeded to the 4th drying room by drying car, and carry out the 4th road and heat, the temperature of the 4th drying room controls below 125 DEG C, and the heat time is about 1h;
Step 5, the 5th road heat, and the PP-R pipe after the 4th road heats is proceeded to the 5th drying room by drying car, and carry out the 5th road and heat, the temperature of the 5th drying room controls below 100 DEG C, and the heat time is about 30min;
Step 6, cooling processing, send the 5th drying room by the PP-R pipe frame after step 5 the 5th road heats, and carry out cooling processing in a dry environment.
2. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, it is characterized in that: in described step one, the temperature of the first drying room controls at 70 ~ 75 DEG C, first heating treatment time is 70 ~ 80min.
3. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, it is characterized in that: in described step 2, the temperature of the second drying room controls at 90 ~ 95 DEG C, second heating treatment time is 40 ~ 50min.
4. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, it is characterized in that: in described step 3, the temperature of the 3rd drying room controls at 100 ~ 105 DEG C, the 3rd road heating treatment time is 20 ~ 30min.
5. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, it is characterized in that: in described step 4, the temperature of the 4th drying room controls at 115 ~ 125 DEG C, the 4th road heating treatment time is 30 ~ 40min.
6. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, it is characterized in that: in described step 5, the temperature of the 5th drying room controls at 90 ~ 100 DEG C, the 5th road heating treatment time is 25 ~ 30min.
7. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, is characterized in that: the temperature of described first drying room, the second drying room, the 3rd drying room, the 4th drying room, the 5th drying room is controlled by temperature controller respectively and regulates.
8. a kind of atactic copolymerized polypropene (PP-R) tubing annealing process as claimed in claim 1, is characterized in that: on described baking car, the spacing of adjacent PP-R pipe is 3 ~ 4cm, controls PP-R pipe uniform rotation in particular during a heating process by baking car.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510562833.1A CN105252793B (en) | 2015-09-07 | 2015-09-07 | A kind of atactic copolymerized polypropene (PP R) tubing annealing process |
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| CN201510562833.1A CN105252793B (en) | 2015-09-07 | 2015-09-07 | A kind of atactic copolymerized polypropene (PP R) tubing annealing process |
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| CN105252793B CN105252793B (en) | 2017-07-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107139379A (en) * | 2017-06-05 | 2017-09-08 | 岳西县同兴尼龙橡胶制品有限公司 | A kind of air-conditioning mask injection moulding process |
| CN111037954A (en) * | 2019-11-18 | 2020-04-21 | 临海伟星新型建材有限公司 | Method for improving pressure resistance of random copolymerization polypropylene pipe fitting |
| CN112300426A (en) * | 2020-10-26 | 2021-02-02 | 广东安德力新材料有限公司 | Preparation method of polypropylene film layer capable of eliminating stress residue |
| CN114347518A (en) * | 2021-12-31 | 2022-04-15 | 漳州杰安塑料有限公司 | Crystallization process of PLA straw |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107139379A (en) * | 2017-06-05 | 2017-09-08 | 岳西县同兴尼龙橡胶制品有限公司 | A kind of air-conditioning mask injection moulding process |
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| CN112300426A (en) * | 2020-10-26 | 2021-02-02 | 广东安德力新材料有限公司 | Preparation method of polypropylene film layer capable of eliminating stress residue |
| CN114347518A (en) * | 2021-12-31 | 2022-04-15 | 漳州杰安塑料有限公司 | Crystallization process of PLA straw |
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| CN105252793B (en) | 2017-07-25 |
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