CN112029176B - Special material suitable for producing inner rib reinforced polyethylene corrugated pipe and preparation thereof - Google Patents
Special material suitable for producing inner rib reinforced polyethylene corrugated pipe and preparation thereof Download PDFInfo
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Abstract
The invention relates to a special material suitable for producing an inner rib reinforced polyethylene corrugated pipe, which is prepared from the following raw materials in parts by weight: 100 parts of high-density polyethylene I, 10-50 parts of nylon, 1-40 parts of toughening master batch, 0.1-3 parts of heat stabilizer and 2-15 parts of compatilizer. The special material has the advantages of simple preparation method and good controllability, and the corrugated pipe prepared from the special material has excellent toughness, higher ring stiffness, excellent surface gloss, friction resistance, chemical corrosion resistance, electrical insulation and the like, long service life and good application prospect.
Description
Technical Field
The invention belongs to the technical field of materials, and relates to a special material suitable for producing an inner rib reinforced polyethylene corrugated pipe and a preparation method thereof.
Background
As is well known, the corrugated pipe is a cylindrical thin-wall elastic shell with transverse corrugations, and has various functions of conversion, compensation, connection, energy storage and the like. Compared with the pipe made of the same material, the corrugated pipe has the advantages of light weight, attractive appearance, durability, low cost, good elasticity and the like, and is widely applied to the fields of petrochemical industry, instruments, aerospace, chemical industry, electric power, cement, metallurgy and the like. When in use, the open end of the corrugated pipe is fixed, the sealing end is in a free state and longitudinally or radially changes along the pipe under the action of internal or external pressure, thereby playing roles of damping, maintaining the connection of specific equipment and the like.
Among the various corrugated pipes, polyethylene, polypropylene, nylon or polyvinyl chloride are mainly used as plastic pipes, but the performance of the corrugated pipes manufactured by different plastic pipes is different. For example, a corrugated pipe made of polyethylene material has single performance and has defects in rigidity, toughness, dimensional stability, tensile strength and the like; the corrugated pipe made of polypropylene material has poor mechanical property and limited application range; the corrugated pipe made of nylon material has high cost, poor toughness, short service life and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a special material suitable for producing the inner rib reinforced polyethylene corrugated pipe, which is used for producing the inner rib reinforced polyethylene corrugated pipe with good dimensional stability, better ring rigidity and toughness and high external pressure load.
Another object of the invention is to provide a method for preparing said special material suitable for producing internally ribbed polyethylene corrugated pipes.
The aim of the invention can be achieved by the following technical scheme:
according to the first aspect of the invention, the special material suitable for producing the inner rib reinforced polyethylene corrugated pipe is prepared from the following raw materials in parts by weight: 100 parts of high-density polyethylene I, 10-50 parts of nylon, 1-40 parts of toughening master batch, 0.1-3 parts of heat stabilizer and 2-15 parts of compatilizer.
As one embodiment, the nylon comprises one or a mixture of more than two of nylon 6, nylon 66, nylon 11, nylon 12, nylon 610 and nylon 612.
In a preferred embodiment, the nylon is selected from nylon 6 or nylon 66.
As an embodiment, the toughening master batch is prepared from the following raw materials in parts by weight: 50 parts of high-density polyethylene II, 5-45 parts of polyamide thermoplastic elastomer, 0.05-0.5 part of organic amine modifier and 0.1-2 parts of organic peroxide.
As a preferred embodiment, the molecular weight of the high-density polyethylene II is not greater than the molecular weight of the high-density polyethylene I.
As one embodiment, the polyamide-based thermoplastic elastomer is selected from one of commercially available TPAE-12, TPAE-38 or TPAE-10.
As one embodiment, the organic amine modifier is selected from one or a mixture of two or more of polyacrylamide, acrylamide, triethylenediamine, hexamethylenetetramine or diethylenetriamine.
As one embodiment, the organic peroxide is selected from one or a mixture of more than two of 1, 3-bis-butyl peroxyisopropyl benzene, dibenzoyl peroxide, dicumyl peroxide, tertiary amyl peroxyacetate or tertiary butyl peroxybenzoate.
As one embodiment, the toughening master batch is prepared by the following method: uniformly mixing high-density polyethylene, polyamide thermoplastic elastomer, organic amine modifier and organic peroxide at 50-75 ℃, plugging a natural vent by a double screw extruder, exhausting in vacuum, and melting and granulating at 180-210 ℃.
As one embodiment, the heat stabilizer is one or both of phosphite esters or fatty acid salt soaps.
As a preferred embodiment, the phosphite esters include one or a mixture of two or more of pentaerythritol diisodecyl diphosphate, triphenyl phosphite, pentaerythritol phosphate or triphenyl phosphate.
As a preferred embodiment, the fatty acid salt soap includes one or a mixture of two or more of calcium stearate soap, calcium oleate soap, zinc stearate soap, or zinc palmitate soap.
As one embodiment, the compatibilizing agent is selected from maleic anhydride grafted polyethylene.
As a preferred embodiment, the maleic anhydride grafted polyethylene has a grafting ratio of 0.8 to 1.2%.
According to the second aspect of the invention, the preparation method of the special material suitable for producing the inner rib reinforced polyethylene corrugated pipe comprises the steps of adding the high-density polyethylene I, nylon, toughening master batch, heat stabilizer and compatilizer into a double-screw extruder according to parts by weight, and performing melt granulation at 210-260 ℃.
Compared with the prior art, the invention has the following characteristics:
1) The invention combines the high-density polyethylene I with the nylon, introduces the toughening master batch into the system, takes the high-density polyethylene II and the polyamide thermoplastic elastomer as matrix materials, and can effectively improve the compatibility between the high-density polyethylene II and the polyamide thermoplastic elastomer by adding the organic amine modifier and the organic peroxide, thereby being beneficial to promoting the formation of stronger interfacial bonding force between the polyamide thermoplastic elastomer and the high-density polyethylene II molecules, leading the polyamide thermoplastic elastomer to be uniformly dispersed in a final material system, effectively improving the toughness of a final material and improving the bending strength of the final material;
2) The toughening master batch can play a role in improving the toughness of materials, and can play a role of a compatilizer between the high-density polyethylene I and the nylon because the toughening master batch contains the nonpolar high-density polyethylene II and the polar polyamide thermoplastic elastomer, and can play a synergistic effect with the compatilizer maleic anhydride grafted polyethylene, so that the interfacial binding force between the high-density polyethylene I and the nylon is effectively improved, and the processability of a final material is further improved;
3) The corrugated pipe prepared from the special material has excellent toughness, higher ring stiffness, excellent surface gloss, friction resistance, chemical corrosion resistance, electrical insulation property and the like, simple production process, low cost and long service life.
Detailed Description
The inventor has studied extensively and intensively, found that compounding high-density polyethylene I with nylon and introducing toughening master batch into the system, wherein the toughening master batch takes high-density polyethylene II and polyamide thermoplastic elastomer as matrix materials, and by adding organic amine modifier and organic peroxide, the compatibility between the high-density polyethylene II and the polyamide thermoplastic elastomer can be effectively improved by using the organic amine modifier and the organic peroxide, so that the polyamide thermoplastic elastomer and the high-density polyethylene II molecules can be favorably promoted to form stronger interfacial bonding force, so that the polyamide thermoplastic elastomer can be uniformly dispersed in a final material system, the toughness of the final material can be effectively improved, and the bending strength of the final material can be improved.
Further, it has been found that the toughening masterbatch used can exert a synergistic effect with the compatibilizer maleic anhydride grafted polyethylene, thereby effectively improving the interfacial bonding force between the high-density polyethylene I and the nylon and further improving the processability of the final material, as it contains the nonpolar high-density polyethylene II and the polar polyamide-based thermoplastic elastomer.
On this basis, the present invention has been completed.
The technical solutions of the present invention will be clearly and completely described below in connection with specific embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed embodiment and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments. All other embodiments, which can be made by those skilled in the art without the inventive effort, are intended to be within the scope of the present invention.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein. As used herein, the term "about" when used to modify a numerical value means a margin of error measured within + -5% of the numerical value.
The technical scheme of the invention is further illustrated by the following specific examples, and the raw materials are all commercial products unless specifically indicated.
Table 1 shows the raw material components and the weight part contents thereof of the materials for special purpose of examples 1 to 6 and comparative examples 1 to 2.
TABLE 1 raw material formulation for the specific materials of examples 1-6 and comparative examples 1-2
Table 2 shows the specific types of raw material components of the materials for the special purpose of examples 1 to 6 and comparative examples 1 to 2.
TABLE 2 specific types of raw material components for the specific materials of examples 1 to 6 and comparative examples 1 to 2
Note that: the high density polyethylene I in Table 2 has a melt flow index of 1.2g/10min under conditions of 190 ℃/5 kg; the nylon has a melt flow index of 11g/10min under 270 ℃/2.16kg conditions.
Table 3 shows the specific types of components of the toughening masterbatches used in examples 1-6 and comparative example 1.
TABLE 3 types of components in the toughening masterbatches used in examples 1-6 and comparative example 1
Note that: the high density polyethylene II in Table 3 has a melt flow index of 1.8g/10min under conditions of 190℃and 5 kg.
Table 4 shows the components of the toughening master batches used in examples 1 to 6 and comparative example 1 and the weight part contents thereof.
TABLE 4 toughening masterbatches for examples 1-6 and comparative example 1 were prepared from the components in parts by weight
The preparation method of the toughening master batch in the embodiment 1-2 comprises the following steps: uniformly mixing high-density polyethylene, polyamide thermoplastic elastomer, organic amine modifier and organic peroxide according to parts by weight at 50 ℃, plugging a natural vent by adopting a double-screw extruder, exhausting in vacuum, and melting and granulating at 195 ℃.
The preparation method of the toughening master batch in the embodiment 3 comprises the following steps: uniformly mixing high-density polyethylene, polyamide thermoplastic elastomer, organic amine modifier and organic peroxide according to parts by weight at 75 ℃, plugging a natural vent by adopting a double-screw extruder, exhausting in vacuum, and melting and granulating at 180 ℃.
The preparation method of the toughening master batch in examples 4 to 6 comprises the following steps: uniformly mixing high-density polyethylene, polyamide thermoplastic elastomer, organic amine modifier and organic peroxide according to parts by weight at 65 ℃, plugging a natural vent by adopting a double-screw extruder, exhausting in vacuum, and melting and granulating at 210 ℃.
The preparation method of the toughening master batch in comparative example 1 is the same as in examples 4 to 6.
In preparing the specialty materials, reference is made to the following information:
the preparation method of the special material of the embodiment 1-2 comprises the following steps: adding the raw material components in parts by weight into a double-screw extruder with the length-diameter ratio of 40:1, carrying out melt mixing dispersion at 210 ℃, extruding and granulating.
The preparation method of the special material of the embodiment 3 comprises the following steps: adding the raw material components in parts by weight into a double-screw extruder with the length-diameter ratio of 40:1, carrying out melt mixing dispersion at 248 ℃, extruding and granulating.
The preparation method of the special material of the embodiment 4-5 comprises the following steps: adding the raw material components in parts by weight into a double-screw extruder with the length-diameter ratio of 40:1, carrying out melt mixing dispersion at 260 ℃, extruding and granulating.
The preparation method of the special material of the example 6 comprises the following steps: adding the raw material components in parts by weight into a double-screw extruder with the length-diameter ratio of 40:1, carrying out melt mixing dispersion at 240 ℃, extruding and granulating.
The preparation method of the special material of comparative examples 1-2 is the same as in example 6.
Shown in Table 5 below are the results of performance tests of corrugated pipes (5 mm in thickness) made of the exclusive materials of examples 1 to 6 and comparative examples 1 to 2.
TABLE 5 bellows Performance test results
As can be seen from the test results in Table 5, the ring stiffness of the corrugated pipe material prepared from the special material of the invention can reach 13.7-17.8 KN/m 2 The bending strength can reach 29.8-42.9 MPa, the notch impact strength of the cantilever beam can reach 45.7-58.2 KJ/m, and the fracture phenomenon does not occur when the cantilever beam is flattened to the extent that the appearance is deformed by 50%. Therefore, the corrugated pipe material prepared from the special material has excellent comprehensive performance, and the defect of the traditional corrugated pipe material in performance is overcome.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (9)
1. The special material suitable for producing the inner rib reinforced polyethylene corrugated pipe is characterized in that,
the material is prepared from the following raw materials in parts by weight: 100 parts of high-density polyethylene I, 10-50 parts of nylon, 1-40 parts of toughening master batch, 0.1-3 parts of heat stabilizer and 2-15 parts of compatilizer;
the toughening master batch is prepared from the following raw materials in parts by weight: 50 parts of high-density polyethylene II, 5-45 parts of polyamide thermoplastic elastomer, 0.05-0.5 part of organic amine modifier and 0.1-2 parts of organic peroxide;
the molecular weight of the high-density polyethylene II is not greater than that of the high-density polyethylene I.
2. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the nylon comprises one or more than two of nylon 6, nylon 66, nylon 11, nylon 12, nylon 610 and nylon 612.
3. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the polyamide thermoplastic elastomer is selected from one of commercially available TPAE-12, TPAE-38 or TPAE-10.
4. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the organic amine modifier is one or more than two of polyacrylamide, acrylamide, triethylenediamine, hexamethylenetetramine or diethylenetriamine.
5. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the organic peroxide is selected from one or more than two of 1, 3-bis-butyl peroxyisopropyl benzene, dibenzoyl peroxide, dicumyl peroxide, tertiary amyl peroxyacetate or tertiary butyl peroxybenzoate.
6. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the toughening master batch is prepared by the following method: uniformly mixing high-density polyethylene, polyamide thermoplastic elastomer, organic amine modifier and organic peroxide at 50-75 ℃, plugging a natural vent by a double screw extruder, exhausting in vacuum, and melting and granulating at 180-210 ℃.
7. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the heat stabilizer is one or two of phosphite esters or fatty acid salt soaps, wherein the phosphite esters comprise one or more of pentaerythritol diisodecyl phosphite, triphenyl phosphite, pentaerythritol phosphate or triphenyl phosphate, and the fatty acid salt soaps comprise one or more of calcium stearate soap, calcium oleate soap, zinc stearate soap or zinc palmitate soap.
8. A special material for producing an inner rib reinforced polyethylene corrugated pipe according to claim 1, wherein,
the compatilizer is selected from maleic anhydride grafted polyethylene.
9. The method for producing a material for internal rib reinforced polyethylene corrugated pipe according to any one of claims 1 to 8, wherein,
adding the high-density polyethylene I, nylon, toughening master batch, heat stabilizer and compatilizer into a double-screw extruder according to parts by weight, and melting and granulating at 210-260 ℃.
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