CN115947986B - HDPE car callus on sole of easily finalizing design - Google Patents
HDPE car callus on sole of easily finalizing design Download PDFInfo
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- CN115947986B CN115947986B CN202310021430.0A CN202310021430A CN115947986B CN 115947986 B CN115947986 B CN 115947986B CN 202310021430 A CN202310021430 A CN 202310021430A CN 115947986 B CN115947986 B CN 115947986B
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- 239000004700 high-density polyethylene Substances 0.000 title claims abstract description 44
- 229920001903 high density polyethylene Polymers 0.000 title claims abstract description 43
- 238000013461 design Methods 0.000 title description 3
- 206010020649 Hyperkeratosis Diseases 0.000 title description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 27
- 229920000642 polymer Polymers 0.000 claims abstract description 27
- 239000002114 nanocomposite Substances 0.000 claims abstract description 22
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- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 16
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
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- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 claims description 31
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 25
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- 239000002131 composite material Substances 0.000 claims description 16
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- 239000000203 mixture Substances 0.000 claims description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000413 hydrolysate Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
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- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
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- 239000007787 solid Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 240000000491 Corchorus aestuans Species 0.000 description 2
- 235000011777 Corchorus aestuans Nutrition 0.000 description 2
- 235000010862 Corchorus capsularis Nutrition 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
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- 238000005034 decoration Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- YAHBZWSDRFSFOO-UHFFFAOYSA-L dimethyltin(2+);2-(2-ethylhexoxy)-2-oxoethanethiolate Chemical compound CCCCC(CC)COC(=O)CS[Sn](C)(C)SCC(=O)OCC(CC)CCCC YAHBZWSDRFSFOO-UHFFFAOYSA-L 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
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- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229920004889 linear high-density polyethylene Polymers 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000001282 organosilanes Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an easily-shaped HDPE automobile foot pad, and relates to the technical field of high polymer materials. Comprises 100 parts of main material and 25-35 parts of additive by weight; the main body material comprises 60-80 parts of high-density polyethylene and 20-40 parts of linear low-density polyethylene; the additive comprises 10-15 parts of polymer-based montmorillonite nanocomposite, 2-10 parts of compatibilizer and 1-5 parts of antioxidant. The invention uses the higher strength and the larger modulus of the high-density polyethylene, and the toughness and the flexibility of the pure high-density polyethylene can be improved by adding the linear low-density polyethylene with the mass content of 30 percent, so that the obtained automobile foot pad has easy stress bending and is convenient to lay.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to an easily-shaped HDPE automobile foot pad.
Background
The automobile foot pad is one of the necessary articles for automobile interior decoration, can not only prevent sediment on shoes from entering the automobile, but also reduce vibration and noise, and enables passengers to feel comfortable. Most foot pads in the market are shaped by foamed plastic, and the plastic is usually viscoelastic, so that the plastic can rebound after bending, and is difficult to shape; meanwhile, the existing automobile foot pad is mainly a PVC soft product, is usually in a fixed shape, is mainly manufactured through injection molding or extrusion-mould pressing-cutting processes, and is high in cost.
High Density Polyethylene (HDPE) is thermoplastic plastic with wide application range, has the characteristics of good chemical stability, easy molding and processing and the like, and the HDPE is developed to be one of important plastic varieties.
The special material for the automobile foot pad comprises the following components in parts by weight: PVC 100, component one 5-30, plasticizer one 80-120, plasticizer two 5-20, stabilizer one 1-5, stabilizer two 1-10, lubricant one 0-1.2, lubricant two 0-1.0, inorganic filler 0-200, colorant 0-20, the car foot pad material that gets with this special material is similar to rubber, have lower hardness, higher elongation at break and lower compression set, but it is as PVC soft products, because plastics usually have viscoelasticity, how much will rebound after bending, the design is difficult.
Disclosure of Invention
The invention aims to provide an easily-shaped HDPE automobile foot pad, which is prepared from linear low-density polyethylene, high-density polyethylene and organically modified montmorillonite serving as main raw materials and a compatibilizer EVA-g-MAH and an antioxidant AT-10 serving as additives, so that the problems that the existing PVC automobile foot pad is generally viscoelastic, can rebound after being bent and is difficult to shape are solved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
The invention relates to an easily-shaped HDPE automobile foot pad which comprises 100 parts by weight of a main body material and 25-35 parts by weight of an additive; the main body material comprises 60-80 parts of high-density polyethylene and 20-40 parts of linear low-density polyethylene; the additive comprises 10-15 parts of polymer-based montmorillonite nanocomposite, 2-10 parts of compatibilizer and 1-5 parts of antioxidant.
Further, the composition comprises, by weight, 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer, and 2 parts of antioxidant.
Further, the composite material also comprises 0.5-1% of vinyl silane modified lignin, 5-10% of long fibrilia and 3-8% of phosphogypsum/red mud mixed powder.
Further, the mass ratio of phosphogypsum to red mud in the phosphogypsum/red mud mixed powder is 3-10:100; wherein the preparation of phosphogypsum/red mud mixed powder comprises the following steps: phosphogypsum and red mud are uniformly mixed according to a solid-water mass ratio of 1:1 adding deionized water, stirring, standing for 6 hours, filtering, and then drying at 100 ℃; and (3) after drying, crushing the obtained solid to a particle size of 12-16 mu m to obtain phosphogypsum/red mud mixed powder, and then placing the phosphogypsum/red mud mixed powder in a muffle furnace to be dried for 4 hours at the temperature of 250 ℃ for later use.
Further, the easily-shaped HDPE automobile foot pad comprises, by weight, 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer, 2 parts of antioxidant, 0.7 part of vinylsilane modified lignin, 7 parts of long fibrilia and 5 parts of phosphogypsum/red mud mixed powder.
Further, the polymer-based montmorillonite nanocomposite is a polystyrene/montmorillonite nanocomposite, a Gemi n i surfactant is adopted to enter montmorillonite layers through intercalation, the montmorillonite layers are effectively peeled, and nano montmorillonite is prepared under the ultrasonic condition; then carrying out solution blending on the organic modified montmorillonite and polystyrene to prepare a polystyrene/organic modified montmorillonite composite material; and drying and crushing the obtained polystyrene/organic modified montmorillonite composite material to obtain the polystyrene/montmorillonite nanocomposite material.
Further, the long fibrilia preparation includes: opening a melt impregnation die, allowing the continuous natural fiber strips to pass through a plurality of pairs of lower impregnation rollers and upper impregnation roller pairs, and simultaneously extruding thermoplastic molten resin into the melt impregnation die through an extruder connecting device to enable the thermoplastic resin melt to carry out melt impregnation on the continuous natural fiber strips; the impregnated continuous natural fiber strip passes through a space between an upper press roller and a lower press roller of a cooling and rolling device, pressure is provided by a press roller spring, cooling of a resin melt and secondary dispersion of natural fibers are realized, and the continuous natural fiber prepreg is obtained.
Further, the preparation of the vinylsilane modified lignin comprises:
weighing vinyl silane, adding the vinyl silane into a stirring container, adding 70% ethanol solution under the stirring conditions of room temperature and 300 r/min, then adjusting the pH value of the system to 4-5 by using 5% acetic acid solution, and continuously stirring and hydrolyzing for 2 hours to obtain vinyl silane hydrolysate;
Then weighing the dry lignin powder, loading the dry lignin powder into a high-speed pulverizer, spraying a vinylsilane hydrolysate on the surface of lignin in a spraying mode, continuously pulverizing at a rotating speed of 25000 r/min, mixing for 2 min, taking out a sample, and drying at 105 ℃ for 2h to obtain vinylsilane modified lignin.
The preparation method of the automobile foot pad comprises the following steps:
stp1, weighing raw materials according to parts by weight;
Stp2, adding high-density polyethylene, long fibrilia and linear low-density polyethylene into a high-speed mixer for stirring for 5min, and adding vinylsilane modified lignin for continuously stirring for 1-2 min;
Stp3, then adding the polymer-based montmorillonite nanocomposite, phosphogypsum/red mud mixed powder, a compatibilizer and an antioxidant, and continuing stirring for 7-10 min;
Stp4, after stirring uniformly, extruding in a double-screw extruder, feeding into a desulfurization extruder for extrusion, and primarily cooling to obtain a granular mixture;
Stp5, putting the granular mixture into a refining extruder for continuous kneading, and then performing injection molding to produce a polymer composite sheet material, and cutting the polymer composite sheet material into sheets with equal areas;
stp6, molding the sheet material into the shape required by the foot pad through a molding machine.
Compared with the prior art, the invention has the following beneficial effects:
the invention uses the higher strength and the larger modulus of the high-density polyethylene, and the toughness and the flexibility of the pure high-density polyethylene can be improved by adding the linear low-density polyethylene with the mass content of 30 percent, so that the obtained automobile foot pad has easy stress bending and is convenient to lay.
Drawings
Fig. 1 is a process diagram of a preparation method of an easily-shaped HDPE automobile foot pad according to an embodiment of the invention.
Detailed Description
The preparation method of the easily-shaped HDPE automobile foot pad comprises the following steps:
stp1, weighing raw materials according to parts by weight;
stp2, adding high-density polyethylene, long fibrilia and linear low-density polyethylene into a high-speed mixer for stirring for 5min, and adding vinylsilane modified lignin for continuously stirring for 2min;
stp3, then adding the polymer-based montmorillonite nanocomposite, phosphogypsum/red mud mixed powder, a compatibilizer and an antioxidant, and continuing stirring for 8 min;
Stp4, after stirring uniformly, extruding in a double-screw extruder, feeding into a desulfurization extruder for extrusion, and primarily cooling to obtain a granular mixture;
Stp5, putting the granular mixture into a refining extruder for continuous kneading, and then performing injection molding to produce a polymer composite sheet material, and cutting the polymer composite sheet material into sheets with equal areas;
stp6, molding the sheet material into the shape required by the foot pad through a molding machine.
Example 1
In the embodiment, the formula of the easily-shaped HDPE automobile foot pad comprises, by weight, 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer EVA-g-MAH and 2 parts of antioxidant AT-10.
Example 2
In the embodiment, the formula of the easily-shaped HDPE automobile foot pad comprises, by weight, 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer EVA-g-MAH, 2 parts of antioxidant AT-10 and 0.7 part of vinylsilane modified lignin.
Example 3
In the embodiment, the formula of the easily-shaped HDPE automobile foot pad comprises, by weight, 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer EVA-g-MAH, 2 parts of antioxidant AT-10, 0.7 part of vinylsilane modified lignin and 7 parts of long fibrilia.
Example 4
In the embodiment, the formula of the easily-shaped HDPE automobile foot pad comprises, by weight, 70 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer EVA-g-MAH, 2 parts of antioxidant AT-10, 0.7 part of vinylsilane modified lignin, 7 parts of long fibrilia and 5 parts of phosphogypsum/red mud mixed powder.
In the above examples 1-4, the mass ratio of phosphogypsum to red mud in the phosphogypsum/red mud mixed powder is 3-10:100; wherein the preparation of phosphogypsum/red mud mixed powder comprises the following steps: phosphogypsum and red mud are uniformly mixed according to a solid-water mass ratio of 1:1 adding deionized water, stirring, standing for 6 hours, filtering, and then drying at 100 ℃; and (3) after drying, crushing the obtained solid to a particle size of 12-16 mu m to obtain phosphogypsum/red mud mixed powder, and then placing the phosphogypsum/red mud mixed powder in a muffle furnace to be dried for 4 hours at the temperature of 250 ℃ for later use.
In the above examples 1 to 4, the polymer-based montmorillonite nanocomposite was a polystyrene/montmorillonite nanocomposite, which was subjected to effective exfoliation of montmorillonite sheets by intercalation of Gemi n i surfactant into the montmorillonite sheets, and preparation of nano montmorillonite under ultrasonic conditions; then carrying out solution blending on the organic modified montmorillonite and polystyrene to prepare a polystyrene/organic modified montmorillonite composite material; and drying and crushing the obtained polystyrene/organic modified montmorillonite composite material to obtain the polystyrene/montmorillonite nanocomposite material.
In the above examples 1-4, the long fibrilia preparation included: opening a melt impregnation die, allowing the continuous natural fiber strips to pass through a plurality of pairs of lower impregnation rollers and upper impregnation roller pairs, and simultaneously extruding thermoplastic molten resin into the melt impregnation die through an extruder connecting device to enable the thermoplastic resin melt to carry out melt impregnation on the continuous natural fiber strips; the impregnated continuous natural fiber strip passes through a space between an upper press roller and a lower press roller of a cooling and rolling device, pressure is provided by a press roller spring, cooling of a resin melt and secondary dispersion of natural fibers are realized, and the continuous natural fiber prepreg is obtained.
In examples 1-4 above, the vinylsilane modified lignin preparation included:
Weighing vinyl silane, adding the vinyl silane into a stirring container, adding 70% ethanol solution under the stirring condition of room temperature and 300 r/min, then adjusting the pH value of the system to 4-5 by using 5% acetic acid solution, and continuously stirring and hydrolyzing for 2 hours to obtain vinyl silane hydrolysate;
Then weighing the dry lignin powder, loading the dry lignin powder into a high-speed pulverizer, spraying a vinylsilane hydrolysate on the surface of lignin in a spraying mode, continuously pulverizing at a rotating speed of 25000 r/min, mixing for 2 min, taking out a sample, and drying at 105 ℃ for 2h to obtain vinylsilane modified lignin.
Comparative example 100.0 parts by weight of PVC (average degree of polymerization 2500), 1.5 parts by weight of organotin (methyl tin mercaptide TM-181), 5 parts by weight of epoxidized soybean oil, 0.5 part of colorant, 100 parts of filler (ultrafine calcium carbonate) and 0.3 part of monoglyceride stearate were placed in a stirrer and stirred and mixed at a rotation speed of 800 rpm and a temperature of 60℃for 2 minutes. Thereafter, 100.0 parts by weight of dioctyl phthalate (DOP) as a plasticizer was added to the above-mentioned mixer three times and stirred at 80℃for another 10 minutes at 800 rpm, and then 10.0 parts by weight of powdered nitrile rubber (33% by mass of nitrile) and 5 parts by weight of EVA (ethylene-vinyl acetate copolymer in which 30% by mass of Vinyl Acetate (VA)) were added to the above-mentioned mixer and stirred and mixed at 35℃for 3 minutes at a stirring speed of 800 rpm to obtain a uniformly mixed mixture. Extruding and granulating the mixture in a double-screw extruder, wherein the temperature of each section of the extruder is 100 ℃, and the screw rotating speed is 20-30 revolutions per minute, so as to obtain the automobile foot pad material composition granules.
The formulations of examples 1-4 were subjected to product preparation, and the same performance test was performed on the same car mat material as that prepared in the comparative example, and the results are shown in the table:
In the table, the shaping effect refers to the reset deformation effect of the product after the product is bent into an arc shape (particularly bending) or an L shape respectively, the corresponding die is adopted for shaping for 2 days, and the die is removed and naturally kept stand for 2 hours.
When the initial state is completely restored, the surface setting effect is 100%, and when the set state is completely maintained, the surface setting effect is 0%.
In the arc shape, the shaping effect of the foot pad is less than 25%, and the foot pad has the capability of maintaining the current situation after the arc shape deformation is completed, so that the situation that the foot pad bulges after the foot pad is paved is avoided; in the L-shaped, in order to ensure that the foot pad is paved after being disassembled, the foot pad is paved for the second time, the foot pad needs to have a reset function after being deformed in the L-shaped mode, and the recovery mode is better when the foot pad is restored to be closer to the original state after being deformed in the L-shaped mode.
From the above data and analysis of experimental results, it is known that;
(1) The high strength and the high modulus of the high-density polyethylene are used, the toughness and the flexibility of the pure high-density polyethylene can be improved by adding the linear low-density polyethylene with the mass content of 30%, and the obtained automobile foot pad is easy to bend under stress and is convenient to lay.
(2) The polymer-based montmorillonite nanocomposite compounded by the polymer and the montmorillonite after blending modification is characterized in that polymer molecular chains are embedded between inorganic lamellar layers of the layered silicate, and even the lamellar layers are peeled off, so that the compounding of the polymer and the inorganic lamellar layers on the nanoscale is realized, and the composite has excellent mechanical property, thermal property, rheological property, barrier property, optical property and the like.
(3) Through formulation and process innovation, the general elasticity of the polymer is eliminated, so that the polymer has the shaping capability similar to that of an iron wire after being bent, a PE thick sheet (the thickness meets the requirements of an automobile foot pad and is generally about 6 mm) is prepared, the similar wire or the iron wire is not easy to rebound after being bent, and shaping can be realized after being forced to bend in the extrusion or vertical extrusion direction.
(4) The surface of lignin is subjected to hydrophobic modification by using vinylsilane, S i-OH functional groups generated by the hydrolysis of vinylsilane form hydrogen bonds and covalent bonds with phenolic hydroxyl groups or carboxyl groups, and meanwhile, the S i-OH functional groups can be subjected to polycondensation reaction with the hydroxyl groups or the carboxyl groups on the surface of powder under certain conditions, so that the surface properties of the powder material are effectively changed, and the toughness of the organosilane is maintained. Introducing nonpolar vinyl silane groups on the surface of lignin; the surface of lignin is subjected to hydrophobic modification, so that the particle size is obviously reduced after lignin modification, and the particle uniformity is improved; simultaneously, the vinyl silane modified lignin plays a role of a nucleating agent in the HDPE matrix, is uniformly embedded into the HDPE matrix as a disperse phase, and has a continuous interface; and the brittle fracture surface of the composite material has a fault structure, lignin is agglomerated into hard particles, the HDPE resin continuous phase is blocked, the fracture surface with the rugged and hollow holes is presented, and the phase separation phenomenon exists;
(5) The dispersibility of the lignin in the polymer resin can be improved by reducing the granularity of the lignin, the contact area of two-phase interfaces is increased, and the adhesion of the two phases is improved, so that the performance of the composite material is improved. The particle size of lignin subjected to TEVS surface modification treatment is obviously reduced, the uniformity of particles is obviously improved, and the dispersibility of lignin in HDPE is improved.
(6) According to the melt impregnation process, discontinuous natural fibers are carded into a continuous state to prepare the natural fibers, meanwhile, as the multi-polar functional groups on the surface of jute fibers are hydrophobic, high-density polyethylene is nonpolar, and the compatibility of the natural fibers and the jute fibers is poor; the compatibilizer EVA-g-MAH is added to improve the interface bonding strength of the resin matrix and the fiber.
(7) The phosphogypsum/red mud is added, so that the dispersibility of the phosphogypsum/red mud in the matrix is improved due to the grain size refinement, the compatibility with the matrix is improved, defects are not easy to generate, holes in the matrix are reduced, and the continuity of the matrix is improved; thereby realizing the improvement of the bending strength and the bending modulus of the HDPE on the premise of keeping the tensile strength and the impact property of the material basically unchanged.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (3)
1. An easily-shaped HDPE automobile foot pad is characterized in that:
comprises 100 parts of main material and 25-35 parts of additive by weight;
wherein the host material comprises 70 parts high density polyethylene and 30 parts linear low density polyethylene;
wherein the additive comprises 12 parts of polymer-based montmorillonite nanocomposite, 6 parts of compatibilizer and 2 parts of antioxidant;
the modified lignin modified by the vinyl silane, 7 parts of long fibrilia and 5 parts of phosphogypsum/red mud mixed powder are also included, and the mass ratio of phosphogypsum to red mud in the phosphogypsum/red mud mixed powder is 3-10:100;
Wherein the preparation of phosphogypsum/red mud mixed powder comprises the following steps: phosphogypsum and red mud are uniformly mixed according to a solid-water mass ratio of 1:1 adding deionized water, stirring, standing for 6 hours, filtering, and then drying at 100 ℃; drying, crushing the obtained solid to a particle size of 12-16 mu m to obtain phosphogypsum/red mud mixed powder, and then placing the phosphogypsum/red mud mixed powder in a muffle furnace to be dried at 250 ℃ for 4h later use;
The preparation of the long fibrilia comprises the following steps: opening a melt impregnation die, allowing the continuous natural fiber strips to pass through a plurality of pairs of lower impregnation rollers and upper impregnation roller pairs, and simultaneously extruding thermoplastic molten resin into the melt impregnation die through an extruder connecting device to enable the thermoplastic resin melt to carry out melt impregnation on the continuous natural fiber strips; the impregnated continuous natural fiber strip passes between an upper press roll and a lower press roll of a cooling roll device, pressure is provided by a press roll spring, cooling of a resin melt and secondary dispersion of natural fibers are realized, and continuous natural fiber prepreg is obtained;
The preparation of the vinylsilane modified lignin comprises the following steps: weighing vinyl silane, adding the vinyl silane into a stirring container, adding 70% ethanol solution under the stirring condition of room temperature and 300 r/min, then adjusting the pH value of the system to 4-5 by using 5% acetic acid solution, and continuously stirring and hydrolyzing for 2 hours to obtain vinyl silane hydrolysate; then weighing the dry lignin powder, loading the dry lignin powder into a high-speed pulverizer, spraying a vinylsilane hydrolysate on the surface of lignin in a spraying mode, continuously pulverizing at a rotating speed of 25000 r/min, mixing for 2min, taking out a sample, and drying at 105 ℃ for 2h to obtain vinylsilane modified lignin.
2. The easily-shaped HDPE automobile foot pad according to claim 1, wherein the polymer-based montmorillonite nanocomposite is a polystyrene/montmorillonite nanocomposite, a Gemini surfactant is adopted to enter montmorillonite layers through intercalation, the montmorillonite layers are effectively peeled, and nano montmorillonite is prepared under an ultrasonic condition; then carrying out solution blending on the organic modified montmorillonite and polystyrene to prepare a polystyrene/organic modified montmorillonite composite material; and drying and crushing the obtained polystyrene/organic modified montmorillonite composite material to obtain the polystyrene/montmorillonite nanocomposite material.
3. The easily-shaped HDPE automobile foot mat of claim 1, wherein the preparation method of the automobile foot mat comprises the following steps:
stp1, weighing raw materials according to parts by weight;
stp2, adding the high-density polyethylene, the long fibrilia and the linear low-density polyethylene into a high-speed mixer, stirring for 5min, and adding vinylsilane modified lignin, and continuously stirring for 1-2min;
stp3, then adding the polymer-based montmorillonite nanocomposite, phosphogypsum/red mud mixed powder, a compatibilizer and an antioxidant, and continuing stirring for 7-10min;
Stp4, after stirring uniformly, extruding in a double-screw extruder, feeding into a desulfurization extruder for extrusion, and primarily cooling to obtain a granular mixture;
Stp5, putting the granular mixture into a refining extruder for continuous kneading, and then performing injection molding to produce a polymer composite sheet material, and cutting the polymer composite sheet material into sheets with equal areas;
stp6, molding the sheet material into the shape required by the foot pad through a molding machine.
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| CN107629297A (en) * | 2017-10-30 | 2018-01-26 | 武汉工程大学 | A kind of polyethylene/polystyrene/organic modification montmonrillonite composite and preparation method thereof |
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| CN107629297A (en) * | 2017-10-30 | 2018-01-26 | 武汉工程大学 | A kind of polyethylene/polystyrene/organic modification montmonrillonite composite and preparation method thereof |
| CN108239323A (en) * | 2017-11-30 | 2018-07-03 | 贵阳兴塑科技股份有限公司 | A kind of method of ardealite and red mud filling PE drainpipes |
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