CN115975280A - Manufacturing and processing technology of polyethylene plastic pipe - Google Patents
Manufacturing and processing technology of polyethylene plastic pipe Download PDFInfo
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- CN115975280A CN115975280A CN202211355761.XA CN202211355761A CN115975280A CN 115975280 A CN115975280 A CN 115975280A CN 202211355761 A CN202211355761 A CN 202211355761A CN 115975280 A CN115975280 A CN 115975280A
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Abstract
The invention discloses a manufacturing and processing technology of a polyethylene plastic pipe, which is prepared from the following raw materials in parts by weight: 80-90 parts of high-density polyethylene particles, 25-30 parts of linear low-density polyethylene resin, 3.5-7.5 parts of heat-conducting auxiliary agent, 1.5-3.5 parts of coupling agent, 1.5-3.5 parts of compatilizer, 1.5-3.5 parts of flame retardant, 1.5-3.5 parts of antioxidant, 1.5-3.5 parts of protective agent, 0.5-2 parts of processing aid, 5-15 parts of crosslinking modifier and 0.5-2 parts of photoinitiator; the high temperature resistance, the strength and the heat conductivity of the product are improved; the strength and the heat conductivity of the material are improved; the wear resistance and creep resistance are improved, the antibacterial performance is endowed, and the preparation method is sanitary, nontoxic and pollution-free, and is suitable for large-scale popularization and production.
Description
Technical Field
The invention relates to the field of pipe preparation, in particular to a manufacturing and processing technology of a polyethylene plastic pipe.
Background
In the field of industrial and civil construction, particularly in heat exchange engineering, materials used for heat exchangers, heat exchange pipelines and the like are all made of metal materials traditionally. Although the metal material has good thermal conductivity, the corrosion resistance of the metal material is poor, the metal heat exchange pipeline and the heat exchanger pollute a treated medium, the service life is short, leakage accidents happen sometimes, and the safe operation of a heat exchange project is influenced, so that a new substitute material is sought to become one of the development directions of heat exchange equipment.
Metal tubing is increasingly being replaced by various polyolefin plastic tubing such as PPR/PE/PVC tubing. The corrosion resistance is the characteristic of most plastics, and compared with metal pipes, the plastic pipe has the advantages of light weight, corrosion resistance, high specific strength, long service life and the like, and is widely applied to building water supply and drainage, heating pipeline systems, central air conditioning systems, chemical pipeline systems and the like. However, pure polymer materials are mostly poor thermal conductors, and the defect of most plastics is that the heat transfer efficiency is very low when the pure polymer materials are used for heat exchange engineering.
At present, in the aspect of pipe application, the characteristics of small friction coefficient, low abrasion, good stress cracking resistance and the like of UHMWPE are particularly important, and the friction coefficient of the UHMWPE is very small and is equivalent to the friction between ice and ice; the abrasion resistance is the first of plastics and is 5-7 times that of other plastics, 7-10 times that of a steel pipe and 27 times that of a brass pipe; the stress cracking resistance is 200 times that of common high density polyethylene and 4 times that of cross-linked polyethylene, thus greatly prolonging the service life of the pipe. UHMWPE has better impact resistance than polycarbonate and can maintain good impact resistance at low temperatures. In addition, the chemical inertness and the relatively low cost of the UHMWPE are better than other pipes in the characteristics of low energy consumption, no scaling, long service life and high cost performance when being used as a conveying pipe. Although the ultrahigh molecular weight has excellent wear resistance, strength and low temperature resistance, the ultrahigh molecular weight polyethylene pipe is difficult to melt and extrude below the decomposition temperature, and 15 to 30 percent of common polyethylene powder is required to be added, so that the molecular weight of the ultrahigh molecular weight polyethylene pipe is easy to reduce, and the wear resistance, the impact resistance, the self lubrication, the impact absorption performance and the like of the ultrahigh molecular weight polyethylene pipe cannot reach indexes.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a manufacturing and processing technology of a polyethylene plastic pipe, which improves the high temperature resistance, the strength and the heat conductivity of the product; the strength and the thermal conductivity of the material are improved; the wear resistance and creep resistance are improved, the antibacterial performance is endowed, and the preparation method is sanitary, nontoxic and pollution-free, and is suitable for large-scale popularization and production.
In order to achieve the aim of the invention, the invention adopts the specific scheme that:
a polyethylene plastic pipe manufacturing and processing technology is prepared from the following raw materials in parts by weight: 80-90 parts of high-density polyethylene particles, 25-30 parts of linear low-density polyethylene resin, 3.5-7.5 parts of heat-conducting auxiliary agent, 1.5-3.5 parts of coupling agent, 1.5-3.5 parts of compatilizer, 1.5-3.5 parts of flame retardant, 1.5-3.5 parts of antioxidant, 1.5-3.5 parts of protective agent, 0.5-2 parts of processing aid, 5-15 parts of crosslinking modifier and 0.5-2 parts of photoinitiator;
wherein the protective agent is polybutylene terephthalate;
the processing aid is a copolymer of vinylidene fluoride and hexafluoropropylene;
the heat-conducting auxiliary agent is a mixture of any two of ceramic fiber, graphite powder, carbon black, carbon fiber, metal powder and nano-alumina;
the compatilizer is a graft of polycarbonate and terpolymer of styrene, acrylonitrile and maleic anhydride;
the flame retardant comprises: spherical magnesium hydroxide and a fibrous structure, wherein the mass ratio of the spherical magnesium hydroxide to the fibrous structure is 5:1-20; modifying the prefabricated body at 85-110 ℃ by one or more of vinyl silane, amino silane, epoxy silane, acyloxy silane, polysiloxane, stearic acid, magnesium stearate, zinc stearate, aluminate and titanate, and drying to obtain the heat-conducting flame retardant;
the crosslinking modifier is formed by polymerizing a polyphenol substance containing catechol groups and isocyanate.
As an improvement, the polyethylene plastic pipe is manufactured and processed by the following steps:
(1) Mixing and extruding the raw materials according to a ratio; feeding the mixed material into an extruder, compressing, melting and homogenizing the mixed material to obtain a high-viscosity elastic melt, and extruding the high-viscosity elastic melt through a machine head;
(2) Determining the size of the die, and forming through a pipe die;
(3) Cooling and shaping the polyethylene plastic pipe;
(4) Spraying a protective agent, performing film melting treatment on the outer surface of the polyethylene plastic pipe by adopting a secondary film forming technology, so that a protective film with one side of 0.1-0.2mm is formed on the outer surface of the polyethylene plastic pipe, and a chlorinated polyethylene adhesive and the polyethylene plastic pipe are adhered into a whole in a molten state;
(5) Cooling and drawing;
(6) Fixing the length and cutting;
(7) Removing internal and external burrs and cleaning;
(8) Drying to obtain the finished product.
As an improvement, in the steps, the cooling liquid used is prepared from the following raw materials in parts by weight: 50-80 parts of deionized water, 20-50 parts of butanol polyoxyethylene ether, 1-5 parts of potassium dichromate, 10-20 parts of phosphoric acid, 10-20 parts of sodium nitrate, 15-25 parts of triethanolamine, 1-5 parts of sodium molybdate, 3-8 parts of potassium hydroxide and 1-5 parts of borax.
As an improvement, the high-density polyethylene particles comprise the following types: high-density polyethylene particles 2480, high-density polyethylene particles 100S, high-density polyethylene particles 100N, high-density polyethylene resin 6097G and high-density polyethylene resin DGDB6097.
As an improvement, the linear low density polyethylene resin is linear low density polyethylene resin 9047.
As an improvement, the antioxidant consists of the following components in percentage by weight: 0.2 to 0.5 percent of main antioxidant; zinc dibutyl dithiocarbamate 0.1-0.3% and aminopyrazole 0.01-0.06%; 0.01 to 0.02 percent of acetylacetone; 0.01 to 0.02 percent of hydroxybenzophenone; 0.01 to 0.02 percent of spiro ethylene glycol; 99 to 99.6 percent of polyolefin powder.
As an improvement, the main antioxidant is 2,6 which is one or two or three of di-tert-butyl-p-cresol, aminophenol and N, N' -diphenyl-p-phenylenediamine, and the total mass fraction of the main antioxidant is unchanged.
As an improvement, the photoinitiator takes unsaturated diacid or unsaturated dianhydride and 3,4-methylenedioxyaniline as raw materials, generates amide containing unsaturated carboxylic acid under the protection of nitrogen or argon, and then reacts in the presence of Lewis acid and hexamethyldisilazane to generate the polymerizable photoinitiator.
As an improvement, the coupling agent consists of the following raw materials in percentage by weight: 10 to 30 percent of polydimethylsiloxane, 2 to 5 percent of phenyltriethoxysilane, 8 to 20 percent of ethyl orthosilicate, 20 to 40 percent of organic solvent, 0.1 to 0.5 percent of hydrochloric acid and the balance of water.
Compared with the prior art, the invention has the beneficial effects that:
the heat conduction auxiliary agent adopts a mixture of any two of ceramic fiber, graphite powder, carbon black, carbon fiber, metal powder and nano-alumina, and the flame retardant comprises: spherical magnesium hydroxide and fibrous structures which improve the high temperature resistance, strength and thermal conductivity of the product; the processing aid improves the strength and the thermal conductivity of the material; the wear resistance and creep resistance are improved, the antibacterial performance is endowed, and the preparation method is sanitary, nontoxic and pollution-free, and is suitable for large-scale popularization and production. The polyethylene plastic pipe has outstanding impact strength and creep resistance, higher heat resistance and cold resistance, and can be used within the range of +130 to-100 ℃; the tensile strength and the bending strength are high, and the elongation and the elastic modulus are high; within a wide temperature range, the water absorption rate is low, the dimensional stability is good, the wear resistance is good, and the paint has certain chemical corrosion resistance. The chlorinated polyethylene has excellent weather resistance, ozone resistance, acid and alkali resistance, chemical resistance and aging resistance, and has good compatibility with other high polymer materials.
Detailed Description
The present invention is further described below by way of specific examples, but the present invention is not limited to only the following examples. Variations, combinations, or substitutions of the invention may be made by those skilled in the art without departing from the spirit, scope, or concept of the invention and are intended to be within the scope of the invention.
Example 1: a polyethylene plastic pipe manufacturing and processing technology is prepared from the following raw materials in parts by weight: 80 parts of high-density polyethylene particles, 25 parts of linear low-density polyethylene resin, 3.5 parts of heat-conducting auxiliary agent, 1.5 parts of coupling agent, 1.5 parts of compatilizer, 1.5 parts of flame retardant, 1.5 parts of antioxidant, 1.5 parts of protective agent, 0.5 part of processing auxiliary agent, 5 parts of crosslinking modifier and 0.5 part of photoinitiator;
example 2: the composition is prepared from the following raw materials in parts by weight: 80-90 parts of high-density polyethylene particles, 30 parts of linear low-density polyethylene resin, 7.5 parts of heat-conducting auxiliary agent, 3.5 parts of coupling agent, 3.5 parts of compatilizer, 3.5 parts of flame retardant, 3.5 parts of antioxidant, 3.5 parts of protective agent, 15 parts of processing auxiliary agent, 15 parts of crosslinking modifier and 2 parts of photoinitiator;
example 3: is prepared from the following raw materials in parts by weight: 85 parts of high-density polyethylene particles, 27 parts of linear low-density polyethylene resin, 5.5 parts of heat conduction auxiliary agent, 2.5 parts of coupling agent, 2.5 parts of compatilizer, 2.5 parts of flame retardant, 2.5 parts of antioxidant, 2.5 parts of protective agent, 1.5 parts of processing auxiliary agent, 10 parts of crosslinking modifier and 1.5 parts of photoinitiator;
wherein the protective agent is polybutylene terephthalate;
the processing aid is a copolymer of vinylidene fluoride and hexafluoropropylene;
the heat-conducting auxiliary agent is a mixture of any two of ceramic fiber, graphite powder, carbon black, carbon fiber, metal powder and nano aluminum oxide;
the compatilizer is a graft of polycarbonate and terpolymer of styrene, acrylonitrile and maleic anhydride;
the flame retardant comprises: spherical magnesium hydroxide and a fibrous structure, wherein the mass ratio of the spherical magnesium hydroxide to the fibrous structure is 5:1-20; modifying the prefabricated body at 85-110 ℃ by one or more of vinyl silane, amino silane, epoxy silane, acyloxy silane, polysiloxane, stearic acid, magnesium stearate, zinc stearate, aluminate and titanate, and drying to obtain the heat-conducting flame retardant;
the crosslinking modifier is formed by polymerizing a polyphenol substance containing catechol groups and isocyanate.
The manufacturing and processing steps of the polyethylene plastic pipe are as follows:
(1) Mixing and extruding the raw materials according to a ratio; feeding the mixed material into an extruder, compressing, melting and homogenizing the mixed material to obtain a high-viscosity elastic melt, and extruding the high-viscosity elastic melt through a machine head;
(2) Determining the size of the die, and forming through a pipe die;
(3) Cooling and shaping the polyethylene plastic pipe;
(4) Spraying a protective agent, performing film melting treatment on the outer surface of the polyethylene plastic pipe by adopting a secondary film forming technology, so that a protective film with one side of 0.1-0.2mm is formed on the outer surface of the polyethylene plastic pipe, and a chlorinated polyethylene adhesive and the polyethylene plastic pipe are adhered into a whole in a molten state;
(5) Cooling and drawing;
(6) Fixing the length and cutting;
(7) Removing internal and external burrs and cleaning;
(8) Drying to obtain the finished product.
In the steps, the used cooling liquid is prepared from the following raw materials in parts by weight: 50-80 parts of deionized water, 20-50 parts of butanol polyoxyethylene ether, 1-5 parts of potassium dichromate, 10-20 parts of phosphoric acid, 10-20 parts of sodium nitrate, 15-25 parts of triethanolamine, 1-5 parts of sodium molybdate, 3-8 parts of potassium hydroxide and 1-5 parts of borax.
The high density polyethylene particles are of the types including: high-density polyethylene particles 2480, high-density polyethylene particles 100S, high-density polyethylene particles 100N, high-density polyethylene resin 6097G and high-density polyethylene resin DGDB6097.
The linear low-density polyethylene resin is linear low-density polyethylene resin 9047.
The antioxidant comprises the following components in percentage by weight: 0.2 to 0.5 percent of main antioxidant; zinc dibutyl dithiocarbamate 0.1-0.3% and aminopyrazole 0.01-0.06%; 0.01 to 0.02 percent of acetylacetone; 0.01 to 0.02 percent of hydroxybenzophenone; 0.01 to 0.02 percent of spiro ethylene glycol; 99 to 99.6 percent of polyolefin powder.
The main antioxidant is one or two or three of 2,6 ditert-butyl-p-cresol, aminophenol and N, N' -diphenyl-p-phenylenediamine, and the total mass fraction of the main antioxidant is unchanged.
The photoinitiator takes unsaturated diacid or unsaturated dianhydride and 3,4-methylenedioxyaniline as raw materials, generates amide containing unsaturated carboxylic acid under the protection of nitrogen or argon, and then reacts in the presence of Lewis acid and hexamethyldisilazane to generate the polymerizable photoinitiator.
The coupling agent consists of the following raw materials in percentage by weight: 10 to 30 percent of polydimethylsiloxane, 2 to 5 percent of phenyltriethoxysilane, 8 to 20 percent of ethyl orthosilicate, 20 to 40 percent of organic solvent, 0.1 to 0.5 percent of hydrochloric acid and the balance of water.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The manufacturing and processing technology of the polyethylene plastic pipe is characterized by being prepared from the following raw materials in parts by weight: 80-90 parts of high-density polyethylene particles, 25-30 parts of linear low-density polyethylene resin, 3.5-7.5 parts of heat-conducting auxiliary agent, 1.5-3.5 parts of coupling agent, 1.5-3.5 parts of compatilizer, 1.5-3.5 parts of flame retardant, 1.5-3.5 parts of antioxidant, 1.5-3.5 parts of protective agent, 0.5-2 parts of processing aid, 5-15 parts of crosslinking modifier and 0.5-2 parts of photoinitiator;
wherein the protective agent is polybutylene terephthalate;
the processing aid is a copolymer of vinylidene fluoride and hexafluoropropylene;
the heat-conducting auxiliary agent is a mixture of any two of ceramic fiber, graphite powder, carbon black, carbon fiber, metal powder and nano-alumina;
the compatilizer is a graft of polycarbonate and terpolymer of styrene, acrylonitrile and maleic anhydride;
the flame retardant comprises: the mass ratio of the spherical magnesium hydroxide to the fibrous structure is 5:1-20; modifying the prefabricated body at 85-110 ℃ by one or more of vinyl silane, amino silane, epoxy silane, acyloxy silane, polysiloxane, stearic acid, magnesium stearate, zinc stearate, aluminate and titanate, and drying to obtain the heat-conducting flame retardant;
the crosslinking modifier is formed by polymerizing a polyphenol substance containing catechol groups and isocyanate.
2. A process for manufacturing a polyethylene plastic pipe according to claim 1, wherein the process steps for manufacturing a polyethylene plastic pipe are as follows:
(1) Mixing and extruding the raw materials according to a ratio; feeding the mixed material into an extruder, compressing, melting and homogenizing to obtain a high-viscosity elastic melt, and extruding by a machine head;
(2) Determining the size of the die, and forming through a pipe die;
(3) Cooling and shaping the polyethylene plastic pipe;
(4) Spraying a protective agent, performing film melting treatment on the outer surface of the polyethylene plastic pipe by adopting a secondary film forming technology, so that a protective film with one side of 0.1-0.2mm is formed on the outer surface of the polyethylene plastic pipe, and a chlorinated polyethylene adhesive and the polyethylene plastic pipe are adhered into a whole in a molten state;
(5) Cooling and drawing;
(6) Fixing the length and cutting;
(7) Removing internal and external burrs and cleaning;
(8) Drying to obtain the finished product.
3. A process for manufacturing a polyethylene plastic pipe according to claim 2, wherein in the above step, the cooling liquid used is prepared from the following raw materials in parts by weight: 50-80 parts of deionized water, 20-50 parts of butanol polyoxyethylene ether, 1-5 parts of potassium dichromate, 10-20 parts of phosphoric acid, 10-20 parts of sodium nitrate, 15-25 parts of triethanolamine, 1-5 parts of sodium molybdate, 3-8 parts of potassium hydroxide and 1-5 parts of borax.
4. A process for manufacturing polyethylene plastic tubes according to claim 1, wherein the high density polyethylene particles are of the kind comprising: high-density polyethylene particles 2480, high-density polyethylene particles 100S, high-density polyethylene particles 100N, high-density polyethylene resin 6097G and high-density polyethylene resin DGDB6097.
5. A process for manufacturing a polyethylene plastic pipe according to claim 1, wherein the linear low density polyethylene resin is linear low density polyethylene resin 9047.
6. The manufacturing and processing technology of the polyethylene plastic pipe as claimed in claim 1, wherein the antioxidant comprises the following components in percentage by weight: 0.2 to 0.5 percent of main antioxidant; zinc dibutyl dithiocarbamate 0.1-0.3% and aminopyrazole 0.01-0.06%; acetylacetone 0.01-0.02%; 0.01 to 0.02 percent of hydroxybenzophenone; 0.01 to 0.02 percent of spiro ethylene glycol; 99 to 99.6 percent of polyolefin powder.
7. A process for manufacturing a polyethylene plastic pipe according to claim 7, wherein the primary antioxidant is one or two or three of 2,6 di-tert-butyl-p-cresol, aminophenol and N, N' -diphenyl-p-phenylenediamine, and the total mass fraction thereof is constant.
8. A process for manufacturing polyethylene plastic pipes according to claim 1 wherein the photoinitiator is prepared from unsaturated diacid or anhydride and 3,4-methylenedioxyaniline under nitrogen or argon protection to form amides containing unsaturated carboxylic acids, which are then reacted in the presence of lewis acid and hexamethyldisilazane to form the polymerizable photoinitiator.
9. The manufacturing process of polyethylene plastic pipe according to claim 1, wherein the coupling agent is composed of the following raw materials by weight percentage: 10 to 30 percent of polydimethylsiloxane, 2 to 5 percent of phenyltriethoxysilane, 8 to 20 percent of ethyl orthosilicate, 20 to 40 percent of organic solvent, 0.1 to 0.5 percent of hydrochloric acid and the balance of water.
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| CN202211355761.XA CN115975280A (en) | 2022-11-01 | 2022-11-01 | Manufacturing and processing technology of polyethylene plastic pipe |
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| CN202211355761.XA CN115975280A (en) | 2022-11-01 | 2022-11-01 | Manufacturing and processing technology of polyethylene plastic pipe |
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2022
- 2022-11-01 CN CN202211355761.XA patent/CN115975280A/en active Pending
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