CN108929477B - Color-change-resistant high-strength polyethylene pipe and preparation method thereof - Google Patents
Color-change-resistant high-strength polyethylene pipe and preparation method thereof Download PDFInfo
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Abstract
The invention provides a color-change-resistant high-strength polyethylene pipe and a preparation method thereof, wherein the method comprises the following steps: high density polyethylene HDPE, metallocene linear low density polyethylene mLLDPE, polyoctene rubber TOR, azodiisobutyronitrile, aryl sulfonated diazonium salt, nano calcium carbonate, light stabilizer and dispersant; the mass ratio of the azodiisobutyronitrile to the aryl sulfonated diazonium salt is 1: 1-5: 1; the mass ratio of the high-density polyethylene (HDPE), the metallocene linear low-density polyethylene (mLLDPE) and the polyoctene rubber (TOR) is 10:2-5: 1-2; the aryl sulfonated diazonium salt is prepared by reacting sulfanilic acid and sodium nitrite under the condition of concentrated hydrochloric acid. The polyethylene pipe provided by the invention has the advantages that the color change resistance and the strength of the polyethylene pipe are improved, and meanwhile, compared with the prior art, the preparation method provided by the invention is simple in process and low in cost, and is suitable for industrial production.
Description
Technical Field
The invention relates to a color-change-resistant high-strength polyethylene pipe and a preparation method thereof.
Background
In recent years, with the development of plastic industry, polyethylene pipes are increasingly receiving attention due to the characteristics of light weight, corrosion resistance, low thermal conductivity, good insulating property, convenience in construction, installation and maintenance and the like, and become plastic pipeline varieties with the largest world consumption after PVC, and the application fields of the polyethylene pipes are water supply, agricultural irrigation, gas transportation, pollution discharge, mine mortar transportation and other engineering, oil fields, chemical industry, post-office communication and other fields.
Among polyethylene pipes, High Density Polyethylene (HDPE) pipes have the characteristics of light weight, excellent mechanical properties, excellent crimpability and flexibility, and the like, and are the most competitive pipe varieties. However, due to the structure and the form of the HDPE resin, the pipe is prone to cracking under the action of a certain load for a certain time, namely, the Environmental Stress Cracking Resistance (ESCR) is poor, so that the application of the HDPE pipe in the fields of outdoor water supply pipes, gas pipes, irrigation pipes and the like is influenced. Therefore, ESCR is an important index for evaluating and influencing the service life of HDPE pipes.
Research shows that the ESCR of HDPE resin is not only influenced by external factors such as temperature and external force, but also has a greater relationship with internal factors such as the molecular weight, molecular weight distribution, branching degree, branch length and crystallization condition of the resin. Therefore, in the prior art, there are methods for producing polyethylene resin with high ESCR from the polymerization perspective by connecting reactors in series, adding long-chain branched monomer, controlling reaction conditions, changing catalytic system, etc. as reported in CN1903896, CN1513002, etc. However, from the perspective of resin post-processing modification, there are two main approaches to improve ESCR of materials by modulating resin molecular structure: firstly, the resin is mixed with second components such as polyolefin, elastomer and the like for modification, and the second components play roles in refining spherulites, reducing crystallinity and preventing crack extension in polyethylene. The method is the most common method at present, and has more related reports, such as CN1556835, CN1247204 and the like. And secondly, a cross-linked structure is formed through chemical cross-linking modification, so that the connection among molecular chains is increased, and the environmental stress cracking resistance of the polyethylene material is improved. For example, CN2492729 adopts a silane crosslinked polyethylene layer; ZL 0215154804 uses a novel silane crosslinked polyethylene for pipe production. CN102993535B discloses a polyethylene resin composition for pipes, which is prepared by using HDPE resin as a base material and modifying metallocene linear low density polyethylene (mLLDPE) weather-resistant master batch and organic peroxide through micro-crosslinking. The resin composition has excellent ESCR performance (> 2500 hours). The technology does not have an effective method for improving the weather resistance of the ultra-high molecular weight polyethylene plate and the defect that the ultra-high molecular weight polyethylene plate is easy to fade, the strength of the product has a space for increasing, and meanwhile, the preparation process of the technology is too complex and is not suitable for industrial production.
Disclosure of Invention
Aiming at the problems, the invention provides a color-changing-resistant high-strength polyethylene pipe and a preparation method thereof.
The invention provides a color-change-resistant high-strength polyethylene pipe, which comprises the following components: 100 parts by mass of high-density polyethylene HDPE, 20-50 parts by mass of metallocene linear low-density polyethylene mLLDPE, 10-20 parts by mass of polyoctene rubber TOR, 0.05-0.2 part by mass of azobisisobutyronitrile, 0.01-0.2 part by mass of aryl sulfonated diazonium salt, 1-5 parts by mass of nano calcium carbonate, 02-0.25 part by mass of light stabilizer and 0.1-1 part by mass of dispersant; the mass ratio of the azodiisobutyronitrile to the aryl sulfonated diazonium salt is 1: 1-5: 1; the mass ratio of the high-density polyethylene (HDPE), the metallocene linear low-density polyethylene (mLLDPE) and the polyoctene rubber (TOR) is 10:2-5: 1-2; the aryl sulfonated diazonium salt is prepared by reacting sulfanilic acid and sodium nitrite under the condition of concentrated hydrochloric acid.
Further, the High Density Polyethylene (HDPE) is a PE100 resin.
Further, the light stabilizer is hindered amine light stabilizer, and the dosage of the hindered amine light stabilizer is 0.1-0.5 percent in percentage by weight of the mLLDPE.
Further, the TOR is imported semi-crystalline polyoctene rubber.
Furthermore, the diameter of the nano calcium carbonate is 10-20 nm.
Further, the dispersant is one or more of petroleum ether, paraffin, liquid paraffin, naphthenic oil and polyethylene wax.
Further, the preparation conditions of the aryl sulfonated diazonium salt are as follows: dissolving sulfanilic acid and sodium nitrite in warm water bath at 15-25 deg.C; then adding sodium nitrite into the solution at the temperature of 25-45 ℃, pouring the solution into concentrated hydrochloric acid ice water under the condition of stirring, and keeping the temperature in an ice water bath for 30-60 min to form the aryl diazonium salt.
The invention also provides a manufacturing method of the polyethylene pipe, which is characterized in that high-density polyethylene HDPE, metallocene linear low-density polyethylene mLLDPE, polyoctene rubber TOR, azodiisobutyronitrile, aryl sulfonated diazonium salt, nano calcium carbonate, a light stabilizer and a dispersing agent are weighed according to the proportion of claim 1, then are added into a high-speed mixer together to be stirred for 10-15 minutes, then are added into an extruder to be granulated, and then are added into a full-automatic integrated extruder to be extruded, subjected to vacuum shaping, code spraying, cutting, inspection, packaging and warehousing.
Further, the extrusion temperature was: the feeding section is 150-180 ℃, the compression section is 200-220 ℃, the plasticizing section is 220-230 ℃, the homogenizing section is 200-210 ℃, the mold temperature is 190-210 ℃, and the cooling water temperature is 15-20 ℃; the cooling and shaping vacuum is 0.4 MPa.
The polyoctene rubber is added and mixed with HDPE and mLLDPE according to a certain proportion, so that the mechanical strength performance can be enhanced, and the polyoctene contains linear and cyclic macromolecules, has high elasticity, and can effectively enhance the collapse resistance and the anisotropy of the polymer during extrusion. Meanwhile, the polyoctene rubber has unsaturated groups, and is easier to generate crosslinking reaction under the action of azodiisobutyronitrile and aryl sulfonated diazonium salt, so that the discoloration resistance and the mechanical property are promoted and improved to a certain extent.
Azodiisobutyronitrile and aryl sulfonated diazonium salt are added according to a certain proportion to have a synergistic composite crosslinking effect, compared with the conventional crosslinking reagent peroxide, the azo and diazo compound selected by the invention has better reactivity and free radical generation capacity, and can promote crosslinking more effectively, thereby enhancing the strength, and simultaneously effectively improving the discoloration resistance of the polymer. However, it is preferred that azobisisobutyronitrile is added in a certain ratio to the arylsulfonate diazonium salt, since the addition of an excessive amount of the arylsulfonate diazonium salt increases the risk of the extrusion process and causes excessive crosslinking reaction.
The nanometer calcium carbonate as whitening agent can effectively improve the discoloration resistance of the polymer, but the addition amount of the calcium carbonate needs to be controlled within a certain proportion range, and the mechanical property is greatly reduced by adding excessive calcium carbonate. The hindered amine light stabilizer is used as a conventional additive, and is added into the polymer of the invention according to a certain proportion, so that the further improvement of the anti-tarnishing capability can be effectively promoted.
Compared with the prior art, the mechanical property and the discoloration resistance of the product are further improved, and the method has the greatest advantages of simplifying the production process and reducing the cost of raw materials.
The invention provides a discoloration-resistant high-strength polyethylene pipe and a preparation method thereof.
Detailed Description
The present invention is explained below with reference to specific examples.
A polyethylene pipe material with discoloration resistance and high strength comprises the following components in parts by mass: 100 parts by mass of PE100 resin, 20-50 parts by mass of metallocene linear low density polyethylene mLLDPE, 10-20 parts by mass of imported semi-crystalline polyoctene rubber, 0.05-0.2 part by mass of azodiisobutyronitrile, 0.01-0.2 part by mass of aryl sulfonated diazonium salt, 1-5 parts by mass of nano calcium carbonate with the diameter of 10-20nm, 0.02-0.25 part by mass of hindered amine light stabilizer and 0.1-1 part by mass of liquid paraffin; the mass ratio of the azodiisobutyronitrile to the aryl sulfonated diazonium salt is 1: 1-5: 1; the mass ratio of the PE100 resin to the metallocene linear low density polyethylene mLLDPE to the imported semicrystalline polyoctene rubber is 10:2-5: 1-2; the aryl sulfonated diazonium salt is prepared by reacting sulfanilic acid and sodium nitrite under the condition of concentrated hydrochloric acid.
The manufacturing methods of examples 1 to 5 and comparative examples 1 to 8:
the formulation according to table 1 was prepared as follows:
the preparation conditions of the aryl sulfonated diazonium salt are as follows: the amount of Sulfanilic Acid (SA) is 1.3g-4.5g, the amount of sodium nitrite (NaNO2) is 0.1g-1.5g, and the sulfanilic acid is dissolved in warm water bath at 15 ℃ to 25 ℃; then NaNO2 was added to the above solution at a temperature of 25 deg.C-45 deg.C, and after NaNO2 was dissolved in the mixed solution, the solution was poured into 20mL of ice water containing 1mL of concentrated hydrochloric acid (HCl) with stirring, and the temperature was maintained in an ice water bath for 30min-60min to form an aryl diazonium salt.
The method for manufacturing the polyethylene pipe comprises the following steps: high-density polyethylene (HDPE), metallocene linear low-density polyethylene (mLLDPE), polyoctene rubber (TOR), azobisisobutyronitrile, aryl sulfonated diazonium salt, nano calcium carbonate, a light stabilizer and a dispersing agent are weighed according to the proportion in the following table 1, then are added into a high-speed mixer together to be stirred for 10-15 minutes, are added into an extruder to be granulated, and then are added into a full-automatic integrated extruder to be extruded, subjected to vacuum shaping, code spraying, cutting, inspection, packaging and warehousing. The feeding section is 150-180 ℃, the compression section is 200-220 ℃, the plasticizing section is 220-230 ℃, the homogenizing section is 200-210 ℃, the mold temperature is 190-210 ℃, and the cooling water temperature is 15-20 ℃; the cooling and shaping vacuum is 0.4 MPa.
TABLE 1 formulation of examples and comparative examples
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | Comparative example 8 | |
| HDPE | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| mLLDPE | 35 | 35 | 35 | 20 | 50 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 |
| TOR of polyoctene rubber | 15 | 15 | 15 | 20 | 10 | 0 | 0 | 15 | 15 | 15 | 15 | 15 | 15 |
| Azobisisobutyronitrile | 0.1 | 0.1 | 0.1 | 0.05 | 0.2 | 0 | 0.1 | 0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Aryl sulphonation heavyNitrogen is present in Salt (salt) | 0.05 | 0.1 | 0.02 | 0.05 | 0.04 | 0 | 0.05 | 0.05 | 0 | 0.05 | 0.05 | 0.2 | 0.05 |
| Nano calcium carbonate | 3 | 3 | 3 | 5 | 1 | 0 | 3 | 3 | 3 | 0 | 3 | 3 | 10 |
| Hindered amine light stabilization Agent for treating cancer | 0.1 | 0.1 | 0.1 | 0.02 | 0.25 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0 | 0.1 | 0.1 |
| Liquid paraffin | 0.5 | 0.5 | 0.5 | 1 | 0.1 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
Comparative example 9 a pipe was prepared according to example 1 of CN 102993535B.
And (3) performance testing:
after aging the above examples and comparative examples in a UV oven at a temperature of 80 ℃ for 168 hours, the surface was rated for yellowing, 0 for no discoloration at all and 5 for significant discoloration.
The products of this example and comparative example were injection-molded into standard specimens and the test properties are shown in Table 1
| Examples 1 | Examples 2 | Examples 3 | Examples 4 | Examples 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | Comparative example 8 | Comparative example 9 | |
| Color change | 0 | 0 | 0 | 0 | 0 | 4 | 2 | 3 | 3 | 2 | 3 | 1 | 1 | 1 |
| Tensile breaking strength MPa | 57.3 | 51.6 | 47.5 | 53.4 | 48.9 | 15.8 | 23.1 | 31.0 | 35.6 | 50.5 | 56.8 | 48.2 | 30.6 | 39.1 |
| Elongation at break | 867 | 815 | 796 | 824 | 763 | 364 | 543 | 601 | 673 | 806 | 852 | 745 | 612 | 792 |
Comparing the examples with comparative example 2, it is known that adding polyoctene rubber in a certain ratio to HDPE and mLLDPE can achieve enhanced mechanical strength properties, where polyoctene contains linear and cyclic macromolecules, has high elasticity, and can effectively enhance collapse resistance and anisotropy of polymer during extrusion. Meanwhile, the polyoctene rubber has unsaturated groups, and is easier to generate crosslinking reaction under the action of azodiisobutyronitrile and aryl sulfonated diazonium salt, so that the discoloration resistance and the mechanical property are promoted and improved to a certain extent. Compared with the comparative examples 3, 4 and 7, the embodiment shows that the azodiisobutyronitrile and the aryl sulfonated diazonium salt are added according to a certain proportion to have a synergistic composite crosslinking effect, compared with the conventional crosslinking reagent peroxide, the azo and diazo compound selected by the invention has better reactivity and free radical generation capacity, and more effective accelerated crosslinking is realized, so that the strength is enhanced, and the discoloration resistance of the polymer can be effectively improved. However, it is preferred that azobisisobutyronitrile is added in a certain ratio to the arylsulfonate diazonium salt, since the addition of an excessive amount of the arylsulfonate diazonium salt increases the risk of the extrusion process and causes excessive crosslinking reaction. Comparing examples with comparative examples 5 and 8, it is known that nano calcium carbonate as whitening agent can effectively improve the discoloration resistance of polymer, but the addition amount of calcium carbonate needs to be controlled within a certain proportion range, and excessive addition of calcium carbonate can greatly reduce the mechanical properties. Comparing example with comparative example 6, it can be seen that the hindered amine light stabilizer is used as a conventional additive, and the addition of the hindered amine light stabilizer to the polymer of the present invention according to a certain proportion can effectively promote the further improvement of the anti-tarnishing ability. Comparing the examples with comparative example 9, it can be seen that the mechanical properties and discoloration resistance of the product of the present invention are further improved, and the present invention has the greatest advantages of simplified production process and reduced raw material cost.
Claims (9)
1. A polyethylene pipe material of resistant high strength that discolours, its characterized in that includes: 100 parts by mass of high-density polyethylene HDPE, 20-50 parts by mass of metallocene linear low-density polyethylene mLLDPE, 10-20 parts by mass of polyoctene rubber TOR, 0.05-0.2 part by mass of azobisisobutyronitrile, 0.01-0.2 part by mass of aryl sulfonated diazonium salt, 1-5 parts by mass of nano calcium carbonate, 0.02-0.25 part by mass of light stabilizer and 0.1-1 part by mass of dispersant; the mass ratio of the azodiisobutyronitrile to the aryl sulfonated diazonium salt is 1: 1-5: 1; the mass ratio of the high-density polyethylene (HDPE), the metallocene linear low-density polyethylene (mLLDPE) and the polyoctene rubber (TOR) is 10:2-5: 1-2; the aryl sulfonated diazonium salt is prepared by reacting sulfanilic acid and sodium nitrite under the condition of concentrated hydrochloric acid.
2. The polyethylene pipe of claim 1 wherein said high density polyethylene HDPE is PE100 resin.
3. The polyethylene pipe of claim 1 wherein the light stabilizer is a hindered amine light stabilizer present in an amount of from 0.1% to 0.5% by weight of the mLLDPE.
4. The polyethylene pipe of claim 1 wherein said polyoctene rubber TOR is an imported semicrystalline polyoctene rubber.
5. Polyethylene pipe according to claim 1, characterized in that the nano calcium carbonate has a diameter of 10-20 nm.
6. Polyethylene pipe as claimed in claim 1, wherein the dispersant is one or more of petroleum ether, paraffin, liquid paraffin, naphthenic oil, polyethylene wax.
7. Polyethylene pipe as claimed in claim 1, characterized in that the arylsulphonated diazonium salt is prepared under the following conditions: dissolving sulfanilic acid and sodium nitrite in warm water bath at 15-25 deg.C; then adding sodium nitrite into the solution at the temperature of 25-45 ℃, pouring the solution into concentrated hydrochloric acid ice water under the condition of stirring, and keeping the temperature in an ice water bath for 30-60 min to form the aryl diazonium salt.
8. The method for manufacturing the polyethylene pipe as claimed in claim 1, wherein the high density polyethylene HDPE, the metallocene linear low density polyethylene mLLDPE, the polyoctene rubber TOR, the azobisisobutyronitrile, the aryl sulfonated diazonium salt, the nano calcium carbonate, the light stabilizer and the dispersing agent are weighed according to the proportion of claim 1, then are added into a high-speed mixer together for stirring for 10-15 minutes, then are added into an extruder for granulation, and then are added into a full-automatic integrated extruder for extrusion, vacuum shaping, code spraying, cutting, inspection, packaging and warehousing.
9. The method for manufacturing polyethylene pipe according to claim 8, wherein the extrusion temperature is: the feeding section is 150-180 ℃, the compression section is 200-220 ℃, the plasticizing section is 220-230 ℃, the homogenizing section is 200-210 ℃, the mold temperature is 190-210 ℃, and the cooling water temperature is 15-20 ℃; the cooling and shaping vacuum is 0.4 MPa.
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| CN115519863B (en) * | 2022-10-25 | 2023-04-07 | 广东瑞远新材料有限公司 | Easily-regenerated environment-friendly polyethylene composite pipe and preparation method thereof |
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