CN112920432B - Special strip-shaped aluminum pigment for PC (polycarbonate) and preparation method thereof - Google Patents
Special strip-shaped aluminum pigment for PC (polycarbonate) and preparation method thereof Download PDFInfo
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- CN112920432B CN112920432B CN202110223407.0A CN202110223407A CN112920432B CN 112920432 B CN112920432 B CN 112920432B CN 202110223407 A CN202110223407 A CN 202110223407A CN 112920432 B CN112920432 B CN 112920432B
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 97
- 239000000049 pigment Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000004417 polycarbonate Substances 0.000 title description 40
- 229920000515 polycarbonate Polymers 0.000 title description 4
- 239000012065 filter cake Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 29
- 239000011347 resin Substances 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 21
- 239000000047 product Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims abstract description 9
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims abstract description 8
- 238000002161 passivation Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 17
- 238000001125 extrusion Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000003759 ester based solvent Substances 0.000 claims description 4
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000005456 alcohol based solvent Substances 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 2
- 125000004185 ester group Chemical group 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 4
- 230000000704 physical effect Effects 0.000 abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052709 silver Inorganic materials 0.000 abstract description 3
- 239000004332 silver Substances 0.000 abstract description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 6
- 238000005507 spraying Methods 0.000 description 5
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 3
- 235000019359 magnesium stearate Nutrition 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- DPUOLQHDNGRHBS-UHFFFAOYSA-N Brassidinsaeure Natural products CCCCCCCCC=CCCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-UHFFFAOYSA-N 0.000 description 1
- URXZXNYJPAJJOQ-UHFFFAOYSA-N Erucic acid Natural products CCCCCCC=CCCCCCCCCCCCC(O)=O URXZXNYJPAJJOQ-UHFFFAOYSA-N 0.000 description 1
- 241000192710 Microcystis aeruginosa Species 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- DPUOLQHDNGRHBS-KTKRTIGZSA-N erucic acid Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-KTKRTIGZSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
Abstract
The invention discloses a special strip aluminum pigment for PC and a preparation method thereof, wherein the method comprises the following steps: selecting an aluminum pigment, placing the aluminum pigment in a container, adding a solvent for dispersion, then adding a passivating agent for passivation, and performing post-treatment after passivation to obtain a passivated aluminum filter cake; mixing the obtained passivated aluminum filter cake with carrier resin and a dispersing agent, stirring and pre-dispersing, and then drying and extruding to form a finished product, wherein the carrier resin is ethylene acrylic acid copolymer resin. According to the invention, aluminum powder is subjected to passivation treatment, so that a layer of aluminum oxide film is formed on the surfaces of flaky aluminum particles, the temperature resistance of the flaky aluminum particles is improved, meanwhile, low-viscosity EMA is selected as a carrier, the EMA is a toughening resin, the compatibility with PC is good, the influence on physical properties of the PC is reduced, the use effect of the flaky aluminum particles in the PC is improved, the white brightness and metallic feeling of a finished product are greatly improved, and the appearance of the finished product is free of defects such as silver wires; the improvement of the above points greatly improves the appearance effect and mechanical property of the product.
Description
Technical Field
The invention relates to the technical field of aluminum pigment production, in particular to a special strip-shaped aluminum pigment for a PC and a preparation method thereof.
Background
In recent years, the appearance of the metal-free spraying effect is favored by consumers, more and more household appliance appearances and automotive interiors are made of metal-free spraying materials, the metal-free spraying material has strong appearance texture, is more environment-friendly, avoids a spraying process, reduces a plurality of working procedures such as transportation, transfer and the like, reduces the processing cost, and can be a very potential product. Most of the spraying-free products in the current market are made of ABS, PP, PC, ABS and the like, and have low processing temperature and good material fluidity, so that the appearance effect of the prepared product is good.
The strip-shaped aluminum pigment can be applied to a PC (Polycarbonate) material without spraying, but when the common strip-shaped aluminum pigment is applied to the PC, the PE wax carrier of the common strip-shaped aluminum pigment has poor temperature resistance and compatibility in the PC; meanwhile, the flaky aluminum particles are easy to oxidize at high temperature, so that the surface metal of the product is poor in feel and dark in color; in addition, processing aids such as erucic acid and stearic acid in the ball milling process of aluminum pigments accelerate degradation of PC at high temperature, and have a great influence on physical properties of PC, resulting in significant reduction of impact properties. Therefore, many factors cause the defects of silver wires, water bloom, serious mechanical property reduction and the like in the prior application of the strip-shaped aluminum pigment in the PC, so that the method is not satisfactory to customers.
Therefore, we designed a series of experiments aiming at the problems, and improved the original process and formulation, and successfully developed the high-texture metallic pigment special for PC materials.
Disclosure of Invention
The invention aims to provide a special strip-shaped aluminum pigment for PC and a preparation method thereof, which solve the defects of the prior common strip-shaped aluminum pigment when the prior common strip-shaped aluminum pigment is applied to PC materials.
The invention realizes the above purpose through the following technical scheme:
a preparation method of a special PC strip-shaped aluminum pigment comprises the following steps of
Step one: selecting an aluminum pigment, placing the aluminum pigment in a container, adding a solvent for dispersion, then adding a passivating agent for passivation, and performing post-treatment after passivation to obtain a passivated aluminum filter cake;
step two: mixing the passivated aluminum filter cake obtained in the step one with carrier resin and a dispersing agent, stirring and pre-dispersing, and then drying and extruding to form a finished product, wherein the carrier resin is ethylene acrylic acid copolymer resin.
The further improvement is that in the first step, the aluminum pigment is selected from aluminum pigments with the aluminum content of 60% -70%, the thickness of flaky aluminum particles of 0.2-0.5 mu m and the particle diameter D50 of the flaky aluminum particles of 10-15 mu m.
In the first step, the solvent is selected from esters or alcohols, and the dispersing speed is 15-25rpm.
In the first step, when 1 part of aluminum pigment is selected, 1.5-3 parts of solvent and 0.1-0.2 part of passivating agent are added.
In the first step, one or two of phosphate passivating agent and molybdate passivating agent are selected as the passivating agent, the passivating time is 2-4h, and the passivating process is accompanied by stirring.
A further improvement is that in step one, the post-processing includes: firstly, desolventizing to obtain a passivated aluminum filter cake with 65-70% of solid content, then adding the passivated aluminum filter cake into 3-4 times of ester or alcohol solvents for cleaning once, removing redundant passivating agents, and secondly, desolventizing to obtain the passivated aluminum filter cake with 65-75% of solid content after cleaning.
In the second step, ethylene acrylic acid copolymer resin with melting point lower than 110 ℃ and MA content of 10-30% and molecular weight lower than 100000 is selected, and the dispersing agent is selected from quaternary tetraol stearate or magnesium stearate.
In the second step, the mixing weight ratio of the passivated aluminum filter cake to the carrier resin and the dispersing agent is that the passivated aluminum filter cake to the carrier resin and the dispersing agent=70-75:15-25:1-5.
The further improvement is that in the second step, stirring and pre-dispersing are carried out, and the specific operation of drying and extrusion molding is as follows: mixing the raw materials in proportion, putting the raw materials into a stirrer, stirring at 15-20rpm for 10-20min, and pre-dispersing; then the pre-dispersed materials are put into a drying oven for drying at the drying temperature of 130-150 ℃ for 10-12h; and then the dried material is put into an extruder for extrusion molding, the extrusion temperature is 130-150 ℃, and the rotation speed of a host machine is 400-500rpm, so that a finished product is obtained.
The invention also provides the special strip-shaped aluminum pigment for the PC, which is prepared by adopting the method.
The invention has the beneficial effects that: according to the invention, the flaky aluminum particles are subjected to passivation treatment, so that a layer of aluminum oxide film is formed on the surfaces of the flaky aluminum particles, the temperature resistance of the flaky aluminum particles is improved, meanwhile, low-viscosity EMA is selected as a carrier, the EMA is a toughening resin, the compatibility with PC is good, the influence on the physical properties of the PC is reduced, the use effect of the flaky aluminum particles in the PC is improved, the white brightness and metallic feeling of a finished product color plate are greatly improved, and the appearance of the finished product does not have the defects of silver wires and the like; the improvement of the above points greatly improves the appearance effect and mechanical property of the product.
Drawings
Fig. 1 is an external view of different PC color boards.
Detailed Description
The following examples are set forth in order to provide a further understanding of the present application and are not intended to limit the scope of the present application since it is believed that the present application is susceptible to numerous insubstantial modifications and variations by those skilled in the art in light of the foregoing disclosure.
Device selection, extrusion device: 35 twin screw extruder, aspect ratio: 44-52; stirring equipment: 100L single-blade mixer; drying equipment: 500L vacuum drying oven.
Example 1
A preparation method of a special PC strip-shaped aluminum pigment comprises the following steps:
step one: selecting an aluminum pigment with the aluminum content of 60%, the thickness of flaky aluminum particles of 0.2 mu m and the particle diameter D50 of the flaky aluminum particles of 10 mu m, placing 1 part of the aluminum pigment into a dispersion cylinder, adding 1.5 parts of an ester solvent, opening the dispersion machine, adjusting the rotating speed to 15rpm, dispersing, adding 0.1 part of a phosphate passivating agent, stirring for 2 hours, removing the solvent for the first time to obtain a passivated aluminum filter cake with 65% of solid content, adding the passivated aluminum filter cake into the ester solvent with 3 times of the weight of the passivated aluminum filter cake, cleaning for one time, removing the redundant passivating agent, and removing the solvent for the second time to obtain a passivated aluminum filter cake with 65% of solid content after cleaning;
step two: selecting ethylene acrylic acid copolymer resin with the melting point lower than 110 ℃ and MA content of 10 percent and the molecular weight lower than 100000 as carrier resin, selecting quaternary tetraol stearate as dispersing agent, mixing the passivated aluminum filter cake obtained in the step one with the carrier resin and the dispersing agent, wherein the mixing weight ratio is the passivated aluminum filter cake, the carrier resin and the dispersing agent=70:15:1, putting the mixed raw materials into a stirrer according to the proportion, stirring at 15rpm for 20min and pre-dispersing; then the pre-dispersed materials are put into a drying oven for drying, the drying temperature is 130 ℃, and the drying time is 12 hours; and then the dried material is put into an extruder for extrusion molding, the extrusion temperature is 130 ℃, and the rotation speed of a host machine is 500rpm, so that a finished product is obtained.
Example 2
A preparation method of a special PC strip-shaped aluminum pigment comprises the following steps:
step one: selecting an aluminum pigment with the aluminum content of 65%, the thickness of flaky aluminum particles of 0.3 mu m and the particle diameter D50 of the flaky aluminum particles of 12 mu m, placing 1 part of the aluminum pigment into a dispersion cylinder, adding 2 parts of ester solvents, opening a dispersion machine, adjusting the rotating speed to 20rpm, dispersing, adding 0.15 part of molybdate passivating agent, stirring for 3 hours, removing the solvent for the first time to obtain a passivated aluminum filter cake with the solid content of 68%, adding the passivated aluminum filter cake into an alcohol solvent with the weight of 3.5 times of that of the aluminum filter cake, cleaning for one time, removing the redundant passivating agent, and removing the solvent for the second time to obtain a passivated aluminum filter cake with the solid content of 70% after cleaning;
step two: selecting ethylene acrylic acid copolymer resin with the melting point lower than 110 ℃ and MA content of 20% and molecular weight lower than 100000 as carrier resin, selecting magnesium stearate as dispersing agent, mixing the passivated aluminum filter cake obtained in the step one with the carrier resin and the dispersing agent, wherein the mixing weight ratio is the passivated aluminum filter cake, the carrier resin and the dispersing agent=72:20:3, putting the mixed raw materials into a stirrer according to the proportion, stirring at 18rpm for 15min and pre-dispersing; then the pre-dispersed materials are put into a drying oven for drying, the drying temperature is 140 ℃, and the drying time is 11 hours; and then the dried material is put into an extruder for extrusion molding, the extrusion temperature is 140 ℃, and the rotation speed of a host machine is 450rpm, so that a finished product is obtained.
Example 3
A preparation method of a special PC strip-shaped aluminum pigment comprises the following steps:
step one: selecting an aluminum pigment with the aluminum content of 70%, the flaky aluminum particle thickness of 0.5 mu m and the flaky aluminum particle diameter D50 of 15 mu m, placing 1 part of the aluminum pigment into a dispersion cylinder, adding 3 parts of an alcohol solvent, opening a dispersion machine, adjusting the rotating speed to 25rpm, dispersing, adding 0.2 part of a molybdate passivating agent, stirring for 4 hours, removing the solvent for the first time to obtain a passivated aluminum filter cake with the solid content of 70%, adding the passivated aluminum filter cake into an ester solvent with the weight of 4 times, cleaning for one time, removing the redundant passivating agent, and removing the solvent for the second time to obtain a passivated aluminum filter cake with the solid content of 75% after cleaning;
step two: selecting ethylene acrylic acid copolymer resin with the melting point lower than 110 ℃ and MA content of 30% and molecular weight lower than 100000 as carrier resin, selecting quaternary tetraol stearate as dispersing agent, mixing the passivated aluminum filter cake obtained in the step one with the carrier resin and the dispersing agent, wherein the mixing weight ratio is the passivated aluminum filter cake, the carrier resin and the dispersing agent=75:25:4, putting the mixed raw materials into a stirrer according to the proportion, stirring at 20rpm for 10min and pre-dispersing; then the pre-dispersed materials are put into a drying oven for drying, the drying temperature is 150 ℃ and the drying time is 10 hours; and then the dried material is put into an extruder for extrusion molding, the extrusion temperature is 150 ℃, and the rotation speed of a host machine is 400rpm, so that a finished product is obtained.
And (one) appearance effect detection:
the PC color plate template (after improvement) prepared in example 2 and the PC color plate template (before improvement) prepared by applying the common strip-shaped aluminum pigment to the PC are selected, as shown in FIG. 1, the PC color plate before improvement is arranged on the left side of the figure, the PC color plate after improvement is arranged on the right side of the figure, the white brightness and the metallic feeling of the PC color plate after improvement can be greatly improved, and the overall appearance effect is outstanding. In addition, lab values of the templates before and after improvement were measured to obtain the following data:
and (II) mechanical property detection:
the mechanical properties of the PC color plates before and after the improvement and the blank PC plate (which is made of polycarbonate material without using strip-shaped aluminum pigment) were measured, and the measurement items include flexural modulus (Mpa), tensile strength (Mpa) and IZOD impact strength (KJ/m), and the measurement results are shown in the following table:
as can be seen from the table, the invention reduces the influence on the physical properties of PC by improving the process and the formula, the flexural modulus and the tensile strength of the PC color plate after improvement are even higher than those of blank PC, and the IZOD impact strength is obviously improved compared with that of the product before improvement although the IZOD impact strength is still lower than that of the blank PC.
Comparative example 1
The preparation method of the special PC strip-shaped aluminum pigment has the steps basically same as those of the example 2, and the only difference is that: the dispersant was changed from magnesium stearate to an equivalent amount of quaternary tetraol stearate.
The PC color plate sample plate obtained in comparative example 1 was selected, and its Lab value, flexural modulus (MPa), tensile strength (MPa) and IZOD impact strength (KJ/m) were measured in the same manner, and the measurement results were shown in the following Table:
from the table, after the dispersant is changed into the quaternary tetraol stearate, the overall appearance effect is not obviously changed, but the mechanical properties are further improved, and especially the tensile strength and IZOD impact strength of the product are respectively improved by 24.2% and 44.1%, and the improvement is obvious. Thus, it was demonstrated that the use of the quaternary tetraol stearate as a dispersant in combination with the ethylene acrylic acid copolymer resin provides a remarkable effect.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (2)
1. A preparation method of a special PC strip-shaped aluminum pigment is characterized by comprising the following steps: the steps include
Step one: selecting an aluminum pigment, placing the aluminum pigment in a container, adding a solvent for dispersion, then adding a passivating agent for passivation, and performing post-treatment after passivation to obtain a passivated aluminum filter cake;
the aluminum pigment is selected from aluminum pigments with the aluminum content of 60% -70%, the thickness of flaky aluminum particles of 0.2-0.5 mu m and the particle size D50 of flaky aluminum particles of 10-15 mu m, the solvent is selected from ester or alcohol solvents, the dispersing rotating speed is 15-25rpm, when 1 part of aluminum pigment is selected, 1.5-3 parts of solvent is added, and 0.1-0.2 part of passivating agent is added; the passivating agent is one or two of phosphate passivating agent and molybdate passivating agent, the passivating time is 2-4h, and the passivating process is accompanied by stirring; the post-processing includes: firstly, desolventizing to obtain a passivated aluminum filter cake with 65-70% of solid content, then adding the passivated aluminum filter cake into 3-4 times of ester or alcohol solvents by weight for cleaning once, removing redundant passivating agents, and secondly desolventizing to obtain a cleaned passivated aluminum filter cake with 65-75% of solid content;
step two: mixing the passivated aluminum filter cake obtained in the first step with carrier resin and a dispersing agent, stirring and pre-dispersing, and then drying and extruding to form to obtain a finished product, wherein the carrier resin is ethylene acrylic acid copolymer resin with a melting point lower than 110 ℃ and MA content of 10-30% and molecular weight lower than 100000, and the dispersing agent is quaternary tetraol stearate;
the mixing weight ratio of the passivated aluminum filter cake to the carrier resin and the dispersant is that the passivated aluminum filter cake is the carrier resin and the dispersant is=70-75:15-25:1-5; stirring and pre-dispersing, and then drying and extrusion molding: mixing the raw materials in proportion, putting the raw materials into a stirrer, stirring at 15-20rpm for 10-20min, and pre-dispersing; then the pre-dispersed materials are put into a drying oven for drying at the drying temperature of 130-150 ℃ for 10-12h; and then the dried material is put into an extruder for extrusion molding, the extrusion temperature is 130-150 ℃, and the rotation speed of a host machine is 400-500rpm, so that a finished product is obtained.
2. A special strip aluminum pigment for PC is characterized in that: which is prepared by the method of claim 1.
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