CN114350054A - Medium-density polyethylene sheath material and preparation method thereof - Google Patents
Medium-density polyethylene sheath material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a medium density polyethylene sheath material and a preparation method thereof, wherein the preparation method of the medium density polyethylene sheath material comprises the following steps: 1) according to the weight percentage, 25-31 wt% of HDPE resin, 40-46 wt% of EPPE resin, 16-20 wt% of MDPE resin, 5.40-6.20 wt% of carbon black master batch, 2.5-3.5 wt% of prefabricated modified master batch containing highlight barium sulfate, 0.35-0.45 wt% of antioxidant and 0.35-0.45 wt% of lubricant are put into a mixer for premixing to obtain uniform premix; and 2) extruding and granulating the premix obtained in the step 1) at the temperature of 180-200 ℃ by a double-screw extruder, and cooling to obtain the medium-density polyethylene sheath material. Compared with the prior art, in the preparation method of the density polyethylene sheath material, the prefabricated modified master batch contains the high-gloss barium sulfate, and the high-gloss barium sulfate can improve the melt strength of resin, improve the extruded smoothness and fineness and improve the dispersion effect of the rheological agent in the master batch. The EPPE resin is a special LLDPE resin containing long-chain branch chains, has low crystallinity and high melt strength, and simultaneously has the performances of low-temperature processing and shear resistance.
Description
Technical Field
The invention belongs to the field of polyethylene sheath materials, and particularly relates to a medium-density polyethylene sheath material and a preparation method thereof.
Background
Due to design and use requirements, cable cores of some special optical cables contain fusible components such as PP filling ropes or HDPE insulating layers. Because of the use scene needs (such as easy cable stripping), only the cable core needs to be sheathed after simple coating treatment.
In order to prevent the fusible component from being fused and adhered during the cabling sheath, the processing temperature of the final cabling sheath process needs to be reduced as much as possible. At present, a cabling extruder in the optical cable industry is commonly a 90-extruder, according to research and development, the maximum temperature of the extruder of the optical cable containing fusible components must be controlled at 180 ℃ at 170-.
In view of the above, there is a need to provide a medium density polyethylene sheath material with an ideal extrusion temperature and a preparation method thereof.
Disclosure of Invention
The invention aims to: overcomes at least one defect in the prior art, and provides a medium-density polyethylene sheath material with ideal extrusion temperature and a preparation method thereof.
In order to achieve the above object, the present invention provides a method for preparing a medium density polyethylene sheathing compound, which comprises the following steps:
1) according to the weight percentage, 25-31 wt% of HDPE resin, 40-46 wt% of EPPE resin, 16-20 wt% of MDPE resin, 5.40-6.2 wt% of carbon black master batch, 2.5-3.5 wt% of prefabricated modified master batch containing highlight barium sulfate, 0.35-0.45 wt% of antioxidant and 0.35-0.45 wt% of lubricant are put into a mixer for premixing, so as to obtain uniform premix; and
2) extruding and granulating the premix obtained in the step 1) at the temperature of 180-200 ℃ by a double-screw extruder, and cooling to obtain the medium-density polyethylene sheath material.
According to an embodiment of the method for preparing the density polyethylene sheathing compound according to the present invention, in step 1), the lubricant is polyethylene wax.
According to one embodiment of the preparation method of the density polyethylene sheath material, in the step 1), the antioxidant is a composite antioxidant AT-225 (a mixture of the antioxidants AT-10 and AT-168).
According to an embodiment of the method for preparing the density polyethylene sheathing compound, in the step 1), the carbon black master batch is 45% carbon black master batch (45% of carbon black content).
According to one embodiment of the method for preparing a density polyethylene sheathing compound according to the present invention, in step 1), the HDPE resin has a density of 0.945 to 0.949g/cm3The melt flow rate is 0.6-0.8g/10 min; the density of the EPPE resin is 0.916-0.920g/cm3The melt flow rate is 1.8-2.2g/10 min; the density of the MDPE resin is 0.928-0.932g/cm3The melt flow rate is 0.2-0.3g/10 min.
According to one embodiment of the method for preparing the density polyethylene sheath material, the premixing is carried out in the step 1) in a vertical mixer for 3-5 minutes.
According to one embodiment of the preparation method of the high density polyethylene sheathing compound, the prefabricated modified master batch containing the high-gloss barium sulfate is prepared according to the following steps:
11) according to the weight percentage, 54 to 58 weight percent of EPPE, 2.8 to 3.2 weight percent of PPA, 38 to 42 weight percent of high gloss barium sulfate, 0.4 to 0.6 weight percent of lubricant and 0.4 to 0.6 weight percent of antioxidant are put into an internal mixer for uniform premixing;
12) banburying the uniformly premixed materials in the step 11) in an internal mixer for not less than 12 minutes at the melt temperature of 150 ℃ and 155 ℃ to obtain well-plasticized aggregates; and
13) feeding the internally mixed mixture obtained in the step 12) into a double-screw extruder, extruding the mixture through the double-screw extruder at the temperature of 120-140 ℃, granulating through a single-screw granulator at the temperature of 130-150 ℃, and carrying out air cooling and vibration to obtain the modified master batch.
According to an embodiment of the method for preparing the density polyethylene sheathing compound according to the present invention, in step 11), the lubricant is polyethylene wax.
According to one embodiment of the preparation method of the density polyethylene sheath material, in the step 11), the antioxidant is a composite antioxidant AT-225.
In order to achieve the above object, the present invention also provides a medium density polyethylene sheathing compound, which is prepared according to the preparation method of the medium density polyethylene sheathing compound of the present invention.
Compared with the prior art, the density polyethylene sheath material and the preparation method thereof have the following advantages: the prefabricated modified master batch contains high-gloss barium sulfate, the high-gloss barium sulfate can improve the melt strength of resin, improve the smoothness and fineness of extrusion and improve the dispersion effect of a rheological agent in the master batch, and the EPPE resin is a special LLDPE resin containing long-chain branches, has low crystallinity and high melt strength and simultaneously has the performances of low-temperature processing and shear resistance.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention will be described in further detail with reference to specific embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of a medium-density polyethylene sheath material, which comprises the following steps:
1) according to the weight percentage, 25-31 wt% of HDPE resin, 40-46 wt% of EPPE resin, 16-20 wt% of MDPE resin, 5.40-6.2 wt% of carbon black master batch, 2.5-3.5 wt% of prefabricated modified master batch containing highlight barium sulfate, 0.35-0.45 wt% of antioxidant and 0.35-0.45 wt% of lubricant are put into a mixer for premixing to obtain uniform premix; and
2) extruding and granulating the premix obtained in the step 1) at the temperature of 180-200 ℃ by a double-screw extruder, and cooling to obtain the medium-density polyethylene sheath material.
According to one embodiment of the preparation method of the density polyethylene sheath material, in the step 1), the lubricant is polyethylene wax, the antioxidant is a composite antioxidant AT-225, and the carbon black master batch is 45% of the carbon black master batch.
According to one embodiment of the method for preparing the density polyethylene sheathing compound according to the present invention, in step 1), the HDPE resin has a density of 0.945 to 0.949g/cm3The melt flow rate is 0.6-0.8g/10 min; the density of the EPPE resin is 0.916-0.920g/cm3The melt flow rate is 1.8-2.2g/10 min; the density of the MDPE resin is 0.928-0.932g/cm3The melt flow rate is 0.2-0.3g/10 min.
According to one embodiment of the preparation method of the density polyethylene sheath material, the premixing is carried out in a vertical mixer for 3-5 minutes.
According to one embodiment of the preparation method of the high-density polyethylene sheath material, the prefabricated modified master batch containing the high-gloss barium sulfate is prepared according to the following steps:
according to the weight percentage, 54 to 58 weight percent of EPPE, 2.8 to 3.2 weight percent of PPA, 38 to 42 weight percent of high gloss barium sulfate, 0.4 to 0.6 weight percent of lubricant and 0.4 to 0.6 weight percent of antioxidant are put into an internal mixer for uniform premixing;
12) banburying the uniformly premixed materials in the step 11) in an internal mixer for not less than 12 minutes at the melt temperature of 150 ℃ and 155 ℃ to obtain well-plasticized aggregates; and
13) feeding the internally mixed mixture obtained in the step 12) into a double-screw extruder, extruding the mixture through the double-screw extruder at the temperature of 120-140 ℃, granulating through a single-screw granulator at the temperature of 130-150 ℃, and carrying out air cooling and vibration to obtain the modified master batch.
According to one embodiment of the preparation method of the density polyethylene sheath material, in the step 11), the lubricant is polyethylene wax, and the antioxidant is a composite antioxidant AT-225.
The preparation method of the density polyethylene sheathing compound according to the present invention will be described in detail below with reference to examples and performance tests.
EXAMPLE 1 preparation of a Pre-formed modified masterbatch containing high gloss barium sulfate
Preparing the prefabricated modified master batch according to the following steps:
11) according to weight percentage, 54 wt% of EPPE (Sumitomo CB1001), 3.0 wt% of PPA (Shanghai Shandong polymer 2200B), 42 wt% of high-gloss barium sulfate, 0.5 wt% of lubricant polyethylene wax and 0.5 wt% of composite antioxidant AT-225 are put into an internal mixer to be premixed uniformly;
12) banburying the uniformly premixed materials in the step 11) at the temperature of 150-155 ℃ for not less than 12 minutes to obtain well-plasticized agglomerates; and
13) feeding the internally mixed mixture obtained in the step 12) into a double-screw extruder through a forced feeding machine, extruding the mixture through the double-screw extruder at the temperature of 120-140 ℃, granulating through a single-screw granulator at the temperature of 130-150 ℃, and carrying out air cooling and vibration to obtain modified master batches.
Examples 2-3 preparation of a Pre-formed modified masterbatch containing high gloss barium sulfate
Examples 2-3 were prepared substantially identically to example 1, except that: the contents of the components are different, and the components and contents of examples 2 to 3 are shown in Table 1.
Comparative example 1 preparation of a prefabricated modified masterbatch containing high gloss barium sulfate
The comparative example was prepared substantially the same as example 1, except that: the contents of the components are different, and the components and the contents of comparative example 1 are shown in table 1.
TABLE 1 Components and amounts of Pre-formed modified masterbatch for examples 1-3 and comparative example 1
| Components | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| EPPE-Sumitomo CB1001 | 54.0％ | 56.0％ | 58.0％ | 62.0％ |
| Highlight barium sulfate | 42.0％ | 40.0％ | 38.0％ | 34.0％ |
| PPA-Shanghai Rouzu 2200B | 3.0％ | 2.8％ | 3.2％ | 3.0％ |
| Polyethylene wax | 0.5％ | 0.6％ | 0.4％ | 0.5％ |
| Antioxidant AT-225 | 0.5％ | 0.6％ | 0.4％ | 0.5％ |
The banburying time of each of examples 1-3 and comparative example 1 is more than or equal to 12 minutes, and the banburying temperature is as follows: 150 ℃ and 155 ℃, wherein the processing performance and the dispersion effect of the prefabricated modified master batch in the examples 1-3 are good. After the banburying temperature and time of the comparative example 1 meet the requirements, the melt is too thin, the pan is seriously stuck, the material cannot be discharged, the material can be discharged only after the melt is slowly cooled for about 30 minutes, and the production efficiency is seriously influenced.
Example 4 preparation of a Medium Density polyethylene sheath Material
The medium density polyethylene sheath material is prepared according to the following steps:
1) according to the weight percentage, 25 wt% of HDPE resin (Dupont Dow 3364), 46 wt% of EPPE resin (Sumitomo CB1001), 19.4 wt% of MDPE resin (Borlu FB2310), 5.40 wt% of carbon black master batch (45% carbon black master batch in Weidongkao), 3.5 wt% of prefabricated modified master batch of example 1, 0.35 wt% of antioxidant (composite antioxidant AT-225) and 0.35 wt% of lubricant polyethylene wax are put into a vertical mixer to be premixed for 3-5 minutes, so as to obtain uniform premix; and
2) extruding and granulating the premix obtained in the step 1) at the temperature of 180-200 ℃ by a double-screw extruder with the length-diameter ratio of 44:1, wherein the temperature of the extruder is as follows: 170-180-200-190-200-extruding plasticizing, water drawing, cooling, pelletizing, drying, homogenizing and packaging to obtain the medium-density polyethylene sheathing material.
Examples 5-6 preparation of Medium Density polyethylene sheath materials
Examples 5-6 were prepared substantially identically to example 4, except that: the contents of the components are different, and the components and contents of examples 5 to 6 are shown in Table 2.
Table 2 components and amounts of density polyethylene sheath materials in examples 4-6
| Components | Example 4 | Example 5 | Example 6 |
| HDPE resin-Dow Dupont 3364 | 25.0％ | 30.4％ | 31.0％ |
| EPPE resin-Sumitomo CB1001 | 46.0％ | 40.0％ | 43.5％ |
| MDPE resin-Bolu FB1370 | 19.4％ | 20.0％ | 16.0％ |
| 45% carbon black master batch-Qingdao Weidongke | 5.4％ | 6.2％ | 5.7％ |
| EXAMPLE 1 Pre-formed modified masterbatch | 3.5％ | 2.5％ | 3.0％ |
| Antioxidant AT-225 | 0.35％ | 0.45％ | 0.40％ |
| Polyethylene wax | 0.35％ | 0.45％ | 0.40％ |
| Total up to | 100.0％ | 100.0％ | 100.0％ |
Testing of various performance indexes
The medium density polyethylene sheath materials in the examples 4-6 are detected according to the GB/T15065-2009 requirements, and the test results show that all performance detections meet the national standard requirements, and are shown in Table 3.
Table 3 results of performance test of the density polyethylene sheath materials of examples 4 to 6
Extrusion Process Performance test
Extrusion processing property tests were performed on the medium density polyethylene sheathing materials of examples 4-6:
the type of the extruder: SJ 90X 25 (screw diameter 90mm, length to diameter ratio 25:1), Equipment manufacturer: the southern electrical machinery company Limited without tin selects the model of the optical cable of the tube extruding mould test machine as the common steel strip optical cable, the outer diameter of the optical cable is 8.0-9.0mm, the normal production speed is 50m/min, and the process comparison verifies the process performance difference between the density polyethylene sheath material and the common medium density polyethylene sheath material.
First comparison: the medium density polyethylene sheath material in the examples 4-6 and the conventional medium density polyethylene sheath material of the invention are respectively extruded at the normal extrusion temperature of 170-, 200-, 240-, 245-and 245-respectively, and the results show that the extrusion process performance of the medium density polyethylene sheath material in the examples 4-6 and the conventional medium density polyethylene sheath material of the invention is good and the extrusion surface is smooth and fine and meets the process requirements under the conditions of the extruder of 90 × 25, the temperature of 230-and 250-deg.C and the speed of 50 m/min.
And (3) second comparison: respectively extruding the medium density polyethylene sheathing material of the embodiment 4-6 and the existing medium density polyethylene sheathing material of the invention at the extrusion temperature of 170-180-shows that when the temperature of the 90-25 extruder is reduced from 250 ℃ of 230-180 ℃, the extrusion appearance of the existing medium density polyethylene sheathing material is greatly reduced, severe flow lines and shark skin occur, the process requirements cannot be met, and the possible reason is that the temperature is too low, so that poor plasticization is caused; the medium density polyethylene sheath material in the embodiments 4-6 of the invention still has excellent extrusion appearance, and the surface still keeps smooth and fine, and the possible reasons are that 1, the prefabricated modified master batch has improved process performance-the prefabricated modified master batch contains high-gloss barium sulfate, wherein, the high-gloss barium sulfate can improve the melt strength of resin, improve the fineness and fineness of extrusion, and can improve the dispersion effect of rheological agent in the master batch; 2. the LLDPE resin used is EPPE-CB1001, the EPPE-CB1001 is a special LLDPE resin containing long-chain branches, and compared with the common LLDPE resin, the CB1001 has low crystallinity and high melt strength, so that the LLDPE resin has the properties of low-temperature processing and shear resistance.
In combination with the above detailed description of the embodiments of the present invention, it can be seen that, compared with the prior art, the density polyethylene sheath material and the preparation method thereof of the present invention have the following advantages: the prefabricated modified master batch contains high-gloss barium sulfate, the high-gloss barium sulfate can improve the melt strength of resin, improve the smoothness and fineness of extrusion and improve the dispersion effect of a rheological agent in the master batch, and the EPPE resin is a special LLDPE resin containing long-chain branches, is low in crystallinity and high in melt strength and has the performances of low-temperature processing and shear resistance. The density polyethylene sheath material has a plurality of unique advantages: for example, the energy consumption of the equipment is reduced, the structural design of the optical cable is improved, the shrinkage rate of the optical cable is reduced, and the like, and the optical cable can be widely applied to various fields.
The present invention can be modified and adapted appropriately from the above-described embodiments, according to the principles described above. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The preparation method of the medium-density polyethylene sheath material is characterized by comprising the following steps:
1) according to the weight percentage, 25-31 wt% of HDPE resin, 40-46 wt% of EPPE resin, 16-20 wt% of MDPE resin, 5.40-6.20 wt% of carbon black master batch, 2.5-3.5 wt% of prefabricated modified master batch containing highlight barium sulfate, 0.35-0.45 wt% of antioxidant and 0.35-0.45 wt% of lubricant are put into a mixer for premixing to obtain uniform premix; and
2) extruding and granulating the premix obtained in the step 1) at the temperature of 180-200 ℃ by a double-screw extruder, and cooling to obtain the medium-density polyethylene sheath material.
2. The method for preparing a medium density polyethylene sheathing compound according to claim 1, wherein the lubricant is polyethylene wax in the step 1).
3. The preparation method of the medium density polyethylene sheath material according to claim 1, wherein in the step 1), the antioxidant is a composite antioxidant AT-225.
4. The method for preparing the medium-density polyethylene sheath material according to claim 1, wherein in the step 1), the carbon black master batch is 45% carbon black master batch.
5. The method for preparing the medium density polyethylene sheath material as claimed in claim 1, wherein the HDPE resin in the step 1) has a density of 0.945 to 0.949g/cm3The melt flow rate is 0.6-0.8g/10 min; the density of the EPPE resin is 0.916-0.920g/cm3The melt flow rate is 1.8-2.2g/10 min; the density of the MDPE resin is 0.928-0.932g/cm3The melt flow rate is 0.2-0.3g/10 min.
6. The method for preparing a sheath material of medium density polyethylene according to claim 1, wherein the premixing in step 1) is performed in a vertical mixer for 3-5 minutes.
7. The preparation method of the medium-density polyethylene sheath material according to any one of claims 1 to 6, wherein the prefabricated modified master batch containing the high-gloss barium sulfate is prepared according to the following steps:
11) according to the weight percentage, 54 to 58 weight percent of EPPE, 2.8 to 3.2 weight percent of PPA, 38 to 42 weight percent of high gloss barium sulfate, 0.4 to 0.6 weight percent of lubricant and 0.4 to 0.6 weight percent of antioxidant are put into an internal mixer for uniform premixing;
12) banburying the uniformly premixed materials in the step 11) in an internal mixer for not less than 12 minutes at the melt temperature of 150 ℃ and 155 ℃ to obtain well-plasticized aggregates; and
13) feeding the internally mixed mixture obtained in the step 12) into a double-screw extruder, extruding the mixture through the double-screw extruder at the temperature of 120-140 ℃, granulating through a single-screw granulator at the temperature of 130-150 ℃, and carrying out air cooling and vibration to obtain the modified master batch.
8. The method for preparing a medium density polyethylene sheath material according to claim 7, wherein in step 11), the lubricant is polyethylene wax.
9. The method for preparing the medium density polyethylene sheath material according to claim 7, wherein in the step 11), the antioxidant is a composite antioxidant AT-225.
10. A medium density polyethylene sheathing compound, characterized in that it is prepared according to the method of preparing a medium density polyethylene sheathing compound of any one of claims 1 to 9.
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| JP2004107500A (en) * | 2002-09-19 | 2004-04-08 | Mitsui Chemicals Inc | Surface material of absorbent article |
| CN102504394A (en) * | 2011-11-16 | 2012-06-20 | 和昌（广西）化工有限公司 | Production method of filled masterbatch formed through plasticization |
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