CN102001169A - Technology for processing modified composite polyethylene pipe - Google Patents
Technology for processing modified composite polyethylene pipe Download PDFInfo
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- CN102001169A CN102001169A CN2010102818219A CN201010281821A CN102001169A CN 102001169 A CN102001169 A CN 102001169A CN 2010102818219 A CN2010102818219 A CN 2010102818219A CN 201010281821 A CN201010281821 A CN 201010281821A CN 102001169 A CN102001169 A CN 102001169A
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Abstract
The invention discloses technology for processing a modified composite polyethylene pipe, which comprises the following steps of: sorting; cleaning and drying; granulating again; and performing extrusion molding. The waste polyethylene material is granulated again, and the waste polyethylene material and a brand-new high-density low-pressure polyethylene material are subjected to three-layer co-extrusion method to form the composite polyethylene pipe together. The processing technology is reasonable and feasible; and the cost is reduced and the competitiveness is improved as high as possible under the condition of ensuring the properties of the pipe.
Description
Technical field
The invention discloses a kind of processing technology of composite polyethylene tubing, particularly relate to a kind of non-excavation and bury the processing technology of ground effluent with modification composite polyethylene tubing.
Background technology
Underground blowdown pipeline is the important foundation facility of depending on for existence and development in the city, yet sustainable development along with World Economics, increasing rapidly of the size of population, the continuous quickening of urbanization process, original pipeline design capacity and service ability can not satisfy the modern city requirement, and that pipeline needs is constantly newly-built, reconstruction, reparation and dilatation.If adopt traditional excavation type construction, will inevitably cause traffic jam, original building is ruined soon, has strengthened construction cost greatly, and exists construction quality hidden danger.In order to solve above-mentioned drawback, change excavation and filling and fill out " road slide fastener " phenomenon that causes, breed and produced underground utilities and build trenchless technology.Trenchless technology has energy-saving and environmental protection, civilized construction, noiselessness, free from dust, and short construction period does not influence traffic, does not destroy environment, and integrated cost is low, the tangible advantage of social benefit.
The polyvinyl piping materials pipeline is pliable and tough, and the performance of weldable becomes the first-selection of non-excavation-use pipe.Simultaneously as non-excavation blowdown with pipe, except needs pliability preferably, also need rigidity and bearing capacity preferably, need inside and outside wall smooth simultaneously, can reduce friction and the accumulation of dirt.
Along with the polyethylene prices of raw and semifnished materials rise suddenly and sharply and to the attention of environment, the applicant has developed the non-excavation buried pollution discharge polyvinyl piping materials that utilizes the waste polyethylene material to make, the patent of its art applications, its patent No. is " CN200810235124.2 ", patent name " non-excavation buried pollution discharge modification composite polyethylene tubing ", disclose and " utilized the waste and old PE material after cleaning to make the PE granulation; in the PE granulation that obtains, to add modifier; to dry and extrude by high-speed mixing, produce complete standard compliant buried pollution discharge tubing.Realized recycle and reuse, reduced production cost and reduced consumption, protected environment simultaneously existing resource to waste and old resource." though the tubing that manufactures of this invention met the use standard, on its performance and the high-performance tubing of brand-new high density low-pressure polyethylene granulation manufacturing a certain distance is still arranged, also need further improvement badly.
Summary of the invention
At above-mentioned defective, it is rationally feasible that the object of the invention provides a kind of processing technology, under the condition that guarantees pipe performance, and the processing technology of the modification composite polyethylene tubing that reduces cost as much as possible.
For achieving the above object, the technical solution used in the present invention is:
The processing technology of a kind of modification composite polyethylene tubing of the present invention, described step is specially:
(1), sorting: waste polyethylene is removed impurity, and classify, be divided into three classes: high density low-pressure polyethylene, middle density low-pressure polyethylene, polyethylene from high pressure process;
(2), cleaning and dry: will divide the waste polyethylene of class to clean and drying;
(3), granulation again: choose and reclaim waste and old high density low-pressure polyethylene 40%-60%, middle density low-pressure polyethylene 5%-20%, polyethylene from high pressure process 5%-10% as basic material, add reinforcing agent 5%-15%, antioxidant 3%-15%, mix pulverizing and carry out granulation then, form the modified poly ethylene granulation.
(4), extrusion molding: carry out three layers of mould design co-extrusion, form described composite polyethylene tubing; Described composite polyethylene tubing comprises three layers, inside and outside two-layerly form by brand-new high density low-pressure polyethylene pellet, and the intermediate layer is formed by the modified poly ethylene granulation.
In a preferred embodiment of the present invention, in the described step (3), the mass percent of the high density low-pressure polyethylene of waste and old recovery is that the mass percent of the middle density low-pressure polyethylene of 50%-60%, waste and old recovery is that the mass percent of the polyethylene from high pressure process of 15%-20%, waste and old recovery is 8%-10%.
In a preferred embodiment of the present invention, in the described step (3), the mass percent of described reinforcing agent is 5-10%, antioxidant mass percent be 5-10%.
In a preferred embodiment of the present invention, described reinforcing agent is diamond, graphite or microfine coal.
In a preferred embodiment of the present invention, described step also adds colouring agent 2-5% in (3).
In a preferred embodiment of the present invention, described step also adds lubricant 2% in (3).
In a preferred embodiment of the present invention, described method for separating is one or more the combination that hand-sorting, magnetic separation, density separation, electrostatic separation, flotation, temperature difference sorting, pneumatic jig branch are chosen.
The present invention compares with prior art and has the following advantages:
1) utilizes the waste polyethylene material, clean, choose the reasonable raw material proportioning, add an amount of reinforcing agent and antioxidant, make standard compliant regeneration and granulation, not only reduced cost, also protected environment through classification.
2) produce three layers of composite polyethylene tubing by three-layer co-extruded method, inside and outside wall uses the manufacturing of brand-new high density low-pressure polyethylene pellet, guarantees fineness, can reduce friction and the accumulation of dirt; The granulation of waste polyethylene modification regeneration is adopted in the intermediate layer, under the condition that guarantees the tubing overall performance, has reduced cost as much as possible, has improved competitiveness.
3) adding colouring agent when regeneration and granulation, is that the granulation color that versicolor waste material is made is unified, and adds lubricant, to the damage of equipment, improves slickness in the minimizing forming process.
4) waste and old PE material is carried out sorting and remove impurity, prevented the infringement of process equipment ground has been guaranteed the quality of regeneration and granulation.
The processing technology of a kind of modification composite polyethylene tubing of the present invention, waste and old polythene material is carried out regeneration and granulation, and and brand-new high density low-pressure polyethylene pellet by three-layer co-extruded method, the common composite polyethylene tubing that forms, processing technology is rationally feasible, under the condition that guarantees pipe performance, reduced cost as much as possible, improved competitiveness.
The specific embodiment
Below preferred embodiment of the present invention is described in detail, thereby protection scope of the present invention is made more explicit defining so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that.
The processing technology of a kind of modification composite polyethylene tubing of the present invention, described step is specially:
(1), sorting: waste polyethylene is removed impurity, and classify, be divided into three classes: high density low-pressure polyethylene, middle density low-pressure polyethylene, polyethylene from high pressure process; Described method for separating is one or more the combination that hand-sorting, magnetic separation, density separation, electrostatic separation, flotation, temperature difference sorting, pneumatic jig branch are chosen.
(2), cleaning and dry: will divide the waste polyethylene of class to clean and drying;
(3), granulation again: choose and reclaim waste and old high density low-pressure polyethylene 40%-60%, middle density low-pressure polyethylene 5%-20%, polyethylene from high pressure process 5%-10% as raw material, add reinforcing agent 5%-10%, antioxidant 3%-10%, can also add colouring agent 2%-5% and lubricant 2%, mix pulverizing and carry out granulation then, form the modified poly ethylene granulation.Described reinforcing agent is diamond, graphite or microfine coal.Preferably, the mass percent of the high density low-pressure polyethylene of waste and old recovery is that the mass percent of the middle density low-pressure polyethylene of 50%-60%, waste and old recovery is that the mass percent of the polyethylene from high pressure process of 15%-20%, waste and old recovery is 8%-10%, the mass percent of reinforcing agent is 5-10%, antioxidant mass percent be 5-10%.
(4), extrusion molding: carry out three layers of mould design co-extrusion, form described composite polyethylene tubing; Described composite polyethylene tubing comprises three layers, inside and outside two-layerly form by brand-new high density low-pressure polyethylene pellet, and the intermediate layer is formed by the modified poly ethylene granulation.
At first above method for separating is made simple defining:
Hand-sorting: at first, remove metal and nonmetallic inclusion and reject the waste or used plastics that serious quality descends; Secondly, press the goods classification; At last, the waste or used plastics goods of above-mentioned classification are pressed shade and quality sorting again.
Magnetic separation: the main purpose of magnetic separation is to remove the steel offal impurity of sneaking in waste or used plastics.
Density separation: density separation is to utilize different plastics to have the method that this character of different densities is carried out sorting, the solution sorting is arranged usually, moisture sorting and centrifugal density separation method etc.The solution separating method is that the waste or used plastics that mixes is put in certain solution with certain density, carries out sorting according to the ascending and descending condition of waste or used plastics in this solution then.The waterpower sorter is used in the waterpower sorting always, for improving the efficiency of separation, often need clean back sorting earlier.Centrifugal density separation adopts centrifugal density separation machine.
Electrostatic separation: the method for utilizing the different electrostatic attraction of various plastics to carry out sorting.Step is earlier molding powder to be broken into the fritter that area is about 10m2, after drying, utilize high-field electrode to carry out sorting, need pass through repeatedly sorting for multiple waste or used plastics mixed in together, this is can only sub-elect a kind of plastics because the high-field electrode of high pressure is set in the per pass preliminary election.
The flotation sorting: flotation is to utilize wetting agent to change the wetability of water to frosting, makes some plastics become hydrophily by hydrophobicity, and still floats for bubble on the hydrophobic plastics surface adhesion, thereby reach the method for the purpose of separation.When floatation was separated different types of plastics, irrelevant with the density of plastics, shape, size etc., it was to utilize water that the difference of frosting wettability is carried out sorting.
Temperature difference sorting: be also referred to as the low temperature sorting, utilize various plastics to have the method that different brittle temperatures is carried out sorting.Concrete grammar is as follows: the waste or used plastics of mixing is placed on cooling and pulverizing in the coolers that temperature is-50 degree through once pulverizing, and the plastics of brittle temperature below-50 degree are promptly pulverized, and tell after sieving; To place temperature again be that the coolers cooling of-100 degree is pulverized to the plastics of not pulverizing as yet, sieves out the plastics of embrittlement then.
The pneumatic jig sorting: will be placed in the sorting unit through the plastics of pulverizing and spray, wind utilizes different plastics to the resistance of air-flow and the poor method of carrying out sorting of making a concerted effort of deadweight from horizontal or reverse being blown into.Because the thickness of pulverizing the back granularity can influence the effect of sorting, so the granularity even thickness after this method requires to pulverize.This method also can be used for the stone of sneaking in the separating plastic and sand etc.
Embodiment one:
(1), sorting: hand-sorting (a), remove metal and nonmetallic inclusion and reject the waste polyethylene that serious weight descends.(b), classification: the high density low-pressure polyethylene comprises waste and old water pipe etc.; Middle density low-pressure polyethylene comprises waste and old Hollow barrel, Gas Pipe etc.; Polyethylene from high pressure process comprises bottle cap etc.
(2), cleaning and dry: will divide the waste polyethylene of class to clean and drying;
(3), granulation again: choose and reclaim waste and old high density low-pressure polyethylene 40%, middle density low-pressure polyethylene 20%, polyethylene from high pressure process 10% as basic material, add reinforcing agent 13%, antioxidant 10%, can also add colouring agent 5% and lubricant 2%, mix and pulverize granulation then, form the modified poly ethylene granulation.
(4), extrusion molding: carry out three layers of mould design co-extrusion, form described composite polyethylene tubing; Described composite polyethylene tubing comprises three layers, inside and outside two-layerly form by brand-new high density low-pressure polyethylene pellet, and the intermediate layer is formed by the modified poly ethylene granulation.
Embodiment two:
(1), sorting: (a), magnetic separation: remove steel offal impurity; (b), density separation: the difference by waste and scrap density sub-elects high density low-pressure polyethylene, middle density low-pressure polyethylene, polyethylene from high pressure process;
(2), cleaning and dry: will divide the waste polyethylene of class to clean and drying;
(3), granulation again: choose and reclaim waste and old high density low-pressure polyethylene 60%, middle density low-pressure polyethylene 20%, polyethylene from high pressure process 5% as basic material, add reinforcing agent 5%, antioxidant 5%, can also add colouring agent 3% and lubricant 2%, mix and pulverize granulation then, form the modified poly ethylene granulation.
(4), extrusion molding: carry out three layers of mould design co-extrusion, form described composite polyethylene tubing; Described composite polyethylene tubing comprises three layers, inside and outside two-layerly form by brand-new high density low-pressure polyethylene pellet, and the intermediate layer is formed by the modified poly ethylene granulation.
Embodiment three:
(1), sorting: hand-sorting (a), remove metal and nonmetallic inclusion and reject the waste polyethylene that serious weight descends.(b), classification: the high density low-pressure polyethylene comprises waste and old water pipe; Middle density low-pressure polyethylene comprises waste and old Hollow barrel, Gas Pipe; Polyethylene from high pressure process comprises bottle cap.
(2), cleaning and dry: will divide the waste polyethylene of class to clean and drying;
(3), granulation again: choose and reclaim waste and old high density low-pressure polyethylene 50%, middle density low-pressure polyethylene 10%, polyethylene from high pressure process 8% as basic material, add reinforcing agent 10%, antioxidant 10%, can also add colouring agent 10% and lubricant 2%, mix and pulverize granulation then, form the modified poly ethylene granulation.
(4), extrusion molding: modified poly ethylene granulation and brand-new high density low-pressure polyethylene pellet are added two barrels of extruder respectively, and heating and melting forms two kinds of materials flows, converges through mould, reaches three-layer co-extrudedly, forms described composite polyethylene tubing; Described composite polyethylene tubing comprises three layers, inside and outside two-layerly form by brand-new high density low-pressure polyethylene pellet, and the intermediate layer is formed by the modified poly ethylene granulation.
The present invention compares with prior art and has the following advantages:
1) utilizes the waste polyethylene material, clean, choose the reasonable raw material proportioning, add an amount of reinforcing agent and antioxidant, make the regeneration and granulation of modification, not only reduced cost, also protected environment through classification.
2) produce three layers of composite polyethylene tubing by three-layer co-extruded method, inside and outside wall uses the manufacturing of brand-new high density low-pressure polyethylene pellet, guarantees fineness, can reduce friction and the accumulation of dirt; The modified poly ethylene regeneration and granulation is adopted in the intermediate layer, under the condition that guarantees the tubing overall performance, has reduced cost as much as possible, has improved competitiveness.The tubing that the embodiment of the invention is made is tested through ring stiffness, its ring stiffness 〉=20KN/m
3
3) adding colouring agent when regeneration and granulation, is that the granulation color that versicolor waste material is made is unified, and adds lubricant, to the damage of equipment, improves slickness in the minimizing forming process.
4) waste and old material is carried out sorting and remove impurity, prevented the infringement of process equipment ground has been guaranteed the quality of regeneration and granulation.
The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (7)
1. the processing technology of a modification composite polyethylene tubing is characterized in that described step is specially:
(1), sorting: waste polyethylene is removed impurity, and classify, be divided into three classes: high density low-pressure polyethylene, middle density low-pressure polyethylene, polyethylene from high pressure process;
(2), cleaning and dry: will divide the waste polyethylene of class to clean and drying;
(3), granulation again: the polyethylene from high pressure process 5%-10% that chooses the middle density low-pressure polyethylene 5%-20% of the high density low-pressure polyethylene 40%-60% of waste and old recovery, waste and old recovery, waste and old recovery is as basic material, add reinforcing agent 5%-15%, antioxidant 3%-15%, mix pulverizing and carry out granulation then, form the modified poly ethylene granulation.
(4), extrusion molding: carry out three layers of mould design co-extrusion, form described composite polyethylene tubing; Described composite polyethylene tubing comprises three layers, inside and outside two-layerly form by brand-new high density low-pressure polyethylene, and the intermediate layer is formed by waste polyethylene granulation again.
2. the processing technology of a kind of modification composite polyethylene tubing according to claim 1, it is characterized in that: in the described step (3), be the mass percent of the high density low-pressure polyethylene of waste and old recovery that the mass percent of the middle density low-pressure polyethylene of 50%-60%, waste and old recovery is that the mass percent of the polyethylene from high pressure process of 15%-20%, waste and old recovery is 8%-10%.
3. the processing technology of a kind of modification composite polyethylene tubing according to claim 1 is characterized in that: in the described step (3), the mass percent of described reinforcing agent is 5-10%, antioxidant mass percent be 5-10%.
4. the processing technology of a kind of modification composite polyethylene tubing according to claim 3 is characterized in that: described reinforcing agent is diamond, graphite or microfine coal.
5. the processing technology of a kind of modification composite polyethylene tubing according to claim 1 is characterized in that: described step also adds colouring agent 2%-5% in (3).
6. the processing technology of a kind of modification composite polyethylene tubing according to claim 5 is characterized in that: described step also adds lubricant 2% in (3).
7. the processing technology of a kind of modification composite polyethylene tubing according to claim 1 is characterized in that: described method for separating is one or more the combination that hand-sorting, magnetic separation, density separation, electrostatic separation, flotation, temperature difference sorting, pneumatic jig branch are chosen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102818219A CN102001169A (en) | 2010-09-15 | 2010-09-15 | Technology for processing modified composite polyethylene pipe |
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| CN2010102818219A CN102001169A (en) | 2010-09-15 | 2010-09-15 | Technology for processing modified composite polyethylene pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294828A (en) * | 2011-09-14 | 2011-12-28 | 绵阳龙华薄膜有限公司 | Preparation method for plain high-light shell of green home appliance |
| CN105135076A (en) * | 2015-08-24 | 2015-12-09 | 江苏洁润管业有限公司 | High-strength PE pipe |
| US20220227977A1 (en) * | 2019-05-13 | 2022-07-21 | Nova Chemicals (International) S.A. | Films from recycled polyethylene |
-
2010
- 2010-09-15 CN CN2010102818219A patent/CN102001169A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102294828A (en) * | 2011-09-14 | 2011-12-28 | 绵阳龙华薄膜有限公司 | Preparation method for plain high-light shell of green home appliance |
| CN102294828B (en) * | 2011-09-14 | 2015-11-04 | 绵阳龙华薄膜有限公司 | A kind of preparation method of plain high-light shell of green home appliance |
| CN105135076A (en) * | 2015-08-24 | 2015-12-09 | 江苏洁润管业有限公司 | High-strength PE pipe |
| US20220227977A1 (en) * | 2019-05-13 | 2022-07-21 | Nova Chemicals (International) S.A. | Films from recycled polyethylene |
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Application publication date: 20110406 |