CN107629296B - Low-flow-mark aluminum pigment for plastics and preparation method thereof - Google Patents

Low-flow-mark aluminum pigment for plastics and preparation method thereof Download PDF

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Publication number
CN107629296B
CN107629296B CN201710970912.5A CN201710970912A CN107629296B CN 107629296 B CN107629296 B CN 107629296B CN 201710970912 A CN201710970912 A CN 201710970912A CN 107629296 B CN107629296 B CN 107629296B
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antioxidant
kneader
plastics
aluminum
aluminum pigment
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CN107629296A (en
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徐曈曈
董前年
徐俊军
申太英
叶治宇
朱双单
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Anhui Tianyi Metal New Material Co ltd
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Anhui Tianyi Metal New Material Co ltd
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Abstract

The invention discloses a low-flow-mark aluminum pigment for plastic, which comprises aluminum paste, a carrier, an antioxidant and a lubricant, wherein the particle size of the aluminum paste is 20-40 mu m, the thickness of an aluminum sheet is 1.5-2.5 mu m, and the ratio of the diameter to the thickness is 8-20. The invention has the advantages that the requirements of the injection molding process on the mold are reduced, and the production cost is reduced; the surface of the product is almost free of flow marks and weld lines, the appearance of the plastic product is effectively improved, the appearance and the added value of the product are improved, and the application development of the aluminum pigment in the plastic industry is promoted.

Description

Low-flow-mark aluminum pigment for plastics and preparation method thereof
Technical Field
The invention relates to the field of chemical industry, in particular to a low-flow-mark aluminum pigment for plastic and a preparation method thereof.
Background
The spraying-free technology is the latest novel plastic dyeing technology, the problems of pollution and VOCs (volatile organic compounds) discharge caused by spraying are solved, the cost of terminal production is reduced by 20-30%, and the metal aluminum pigment added into the plastic to prepare the metal-color-imitated spraying-free material is popular in recent years, but the aluminum pigment has the defect of physical structure at present. Referring to fig. 1 and 2, the thickness ratio of the currently commercially available aluminum pigment is between 50 and 200, the thickness is generally between 0.5 and 1.0 μm, and the product is turned over during injection molding, so that the surface of the product has flow marks and weld lines, and the surface of the produced product has many weld lines and flow marks, which affect the appearance of the product. Therefore, the aluminum pigment can be only used on a part of small household appliances and cannot be used for larger parts, and the application of the aluminum pigment in the plastic industry is severely restricted.
Disclosure of Invention
The invention aims to provide a low-flow-mark aluminum pigment for plastics and a preparation method thereof, and the low-flow-mark aluminum pigment for plastics solves the problems of flow marks and weld marks on the surfaces of products of the traditional aluminum pigment and provides an improved place on the preparation method.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the low flow mark aluminum pigment for plastic cement is prepared with aluminum paste of grain size 20-40 micron, aluminum sheet of 1.5-2.5 micron thickness and diameter-thickness ratio 8-20, carrier, antioxidant and lubricant.
The further improvement is that the mass ratio of the aluminum silver paste, the carrier, the antioxidant and the lubricant is 65-75 percent, 20-30 percent, 1-2 percent and 2-4 percent.
In a further improvement, the carrier is selected from one or more of low molecular weight polyolefins, low molecular weight ethylene acrylic acid copolymers, low molecular weight ethylene vinyl acetate copolymers, ethylene maleic anhydride copolymers, and low molecular weight homopolymers.
The further improvement is that the antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 168, antioxidant 1098, antioxidant 3114, antioxidant B900 and antioxidant PS 800.
In a further improvement, the lubricant is selected from one or more of zinc stearate, calcium stearate, silicone powder, fumed silica, and polytetrafluoroethylene.
The preparation method of the low-flow-mark aluminum pigment for the plastic comprises the following steps
a. All the materials are put into the kneader according to the proportion, and the total amount of the materials is controlled to be less than 2/3 of the volume of the stirring box of the kneader;
b. adjusting the temperature of the kneader to 50-70 ℃, turning on a vacuum pump, pumping the vacuum degree of the kneader to be below-0.08 MPa, adjusting the rotating speed of the kneader to 10-30r/min, and stirring for 4-6 h;
c. stopping heating and stirring after stirring, keeping the vacuum degree, cooling to normal temperature, taking out the mixture, and sieving with a 40-100 mesh sieve to obtain the finished product.
The further improvement is that the kneader is selected to be a vacuumizing heating kneader.
The invention has the beneficial effects that:
1) the requirements of the injection molding process on the mold are reduced, and the production cost is reduced;
2) the surface of the product is almost free of flow marks and weld lines, the appearance of the plastic product is effectively improved, the appearance and the added value of the product are improved, and the application development of the aluminum pigment in the plastic industry is promoted.
Drawings
FIG. 1 is a schematic structural view of a conventional aluminum pigment;
FIG. 2 is an overall appearance diagram of a color plate manufactured by using a conventional aluminum pigment;
FIG. 3 is a schematic structural view of an aluminum pigment provided by the present invention;
FIG. 4 is an overall appearance diagram of a color plate manufactured by using the aluminum pigment of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings and the embodiments.
Example 1
A low-flow-mark aluminum pigment for plastics is prepared from aluminum paste, carrier, antioxidant and lubricant. Wherein the grain diameter of the aluminum paste is 20-40 μm, the thickness of the aluminum sheet is 1.5-2.5 μm, and the diameter-thickness ratio is 8-20; the carrier is low molecular weight polyolefin; the antioxidant is antioxidant 1076 and antioxidant 1010; the lubricant is zinc stearate. And the mass ratio of the aluminum silver paste, the carrier, the antioxidant and the lubricant is 65 percent to 30 percent to 1 percent to 4 percent.
The preparation method comprises the following steps: a. all the materials are put into the kneader according to the proportion, and the total amount of the materials is controlled to be less than 2/3 of the volume of the stirring box of the kneader; b. adjusting the temperature of the kneader to 70 ℃, turning on a vacuum pump, pumping the vacuum degree of the kneader to be below-0.08 MPa, adjusting the rotating speed of the kneader to 10r/min, and stirring for 4 h; c. stopping heating and stirring after stirring, keeping the vacuum degree, cooling to normal temperature, taking out the mixture, and sieving by a 40-mesh sieve to obtain a finished product.
Example 2
A low-flow-mark aluminum pigment for plastics is prepared from aluminum paste, carrier, antioxidant and lubricant. Wherein the grain diameter of the aluminum paste is 20-40 μm, the thickness of the aluminum sheet is 1.5-2.5 μm, and the diameter-thickness ratio is 8-20; the carrier is low molecular weight ethylene acrylic acid copolymer and low molecular weight ethylene vinyl acetate copolymer; the antioxidant is antioxidant 168, antioxidant 1098 and antioxidant 3114; the lubricant is calcium stearate and silicone powder. And the mass ratio of the aluminum silver paste, the carrier, the antioxidant and the lubricant is 70 percent to 25 percent to 2 percent to 3 percent.
The preparation method comprises the following steps: a. all the materials are put into the kneader according to the proportion, and the total amount of the materials is controlled to be less than 2/3 of the volume of the stirring box of the kneader; b. adjusting the temperature of the kneader to 60 ℃, turning on a vacuum pump, pumping the vacuum degree of the kneader to be below-0.08 MPa, adjusting the rotating speed of the kneader to 2010r/min, and stirring for 5 hours; c. stopping heating and stirring after stirring, keeping the vacuum degree, cooling to normal temperature, taking out the mixture, and sieving with a 80-mesh sieve to obtain the finished product.
Example 3
A low-flow-mark aluminum pigment for plastics is prepared from aluminum paste, carrier, antioxidant and lubricant. Wherein the grain diameter of the aluminum paste is 20-40 μm, the thickness of the aluminum sheet is 1.5-2.5 μm, and the diameter-thickness ratio is 8-20; the carrier is ethylene maleic anhydride copolymer and low molecular weight homopolymer; the antioxidant is antioxidant B900 and antioxidant PS 800; the lubricant is fumed silica and polytetrafluoroethylene. And the mass ratio of the aluminum silver paste, the carrier, the antioxidant and the lubricant is 75 percent to 20 percent to 2 percent to 3 percent.
The preparation method comprises the following steps: a. all the materials are put into the kneader according to the proportion, and the total amount of the materials is controlled to be less than 2/3 of the volume of the stirring box of the kneader; b. adjusting the temperature of the kneader to 60 ℃, turning on a vacuum pump, pumping the vacuum degree of the kneader to be below-0.08 MPa, adjusting the rotating speed of the kneader to 20r/min, and stirring for 5 hours; c. stopping heating and stirring after stirring, keeping the vacuum degree, cooling to normal temperature, taking out the mixture, and sieving with a 80-mesh sieve to obtain the finished product.
Example 4
A low-flow-mark aluminum pigment for plastics is prepared from aluminum paste, carrier, antioxidant and lubricant. Wherein the grain diameter of the aluminum paste is 20-40 μm, the thickness of the aluminum sheet is 1.5-2.5 μm, and the diameter-thickness ratio is 8-20; the carrier is ethylene maleic anhydride copolymer and low molecular weight homopolymer; the antioxidant is antioxidant 168; the lubricant is fumed silica and polytetrafluoroethylene. And the mass ratio of the aluminum silver paste, the carrier, the antioxidant and the lubricant is 75 percent to 22 percent to 1 percent to 2 percent.
The preparation method comprises the following steps: a. all the materials are put into the kneader according to the proportion, and the total amount of the materials is controlled to be less than 2/3 of the volume of the stirring box of the kneader; b. adjusting the temperature of the kneader to 50 ℃, turning on a vacuum pump, pumping the vacuum degree of the kneader to be below-0.08 MPa, adjusting the rotating speed of the kneader to 30r/min, and stirring for 6 hours; c. stopping heating and stirring after stirring, keeping the vacuum degree, cooling to normal temperature, taking out the mixture, and sieving with a 100-mesh sieve to obtain the finished product.
The raw materials of the aluminum paste selected in the above embodiments are all 20-40 μm in particle size, 1.5-2.5 μm in aluminum sheet thickness, 8-20 in diameter-thickness ratio, and the structure is shown in fig. 3. The structure of the color plate manufactured by the preparation methods is shown in fig. 4, so that the overall effect of the color plate is better, and the flow mark is greatly reduced compared with the color plate manufactured by the traditional aluminum paste.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. A low flow mark aluminum pigment for plastics is characterized in that: the manufacturing material comprises aluminum paste, a carrier, an antioxidant and a lubricant, wherein the particle size of the aluminum paste is 20-40 mu m, the thickness of an aluminum sheet is 1.5-2.5 mu m, and the diameter-thickness ratio is 8-20;
the carrier is selected from one or more of low molecular weight polyolefin, low molecular weight ethylene acrylic acid copolymer, low molecular weight ethylene vinyl acetate copolymer, ethylene maleic anhydride copolymer and low molecular weight homopolymer.
2. The low flow mark aluminum pigment for plastics of claim 1, wherein: the mass ratio of the aluminum paste, the carrier, the antioxidant and the lubricant is 65-75%, 20-30%, 1-2% and 2-4%.
3. The low flow mark aluminum pigment for plastics of claim 1, wherein: the antioxidant is selected from one or more of antioxidant 1076, antioxidant 1010, antioxidant 168, antioxidant 1098, antioxidant 3114, antioxidant B900 and antioxidant PS 800.
4. The low flow mark aluminum pigment for plastics of claim 1, wherein: the lubricant is selected from one or more of zinc stearate, calcium stearate, silicone powder, gas-phase silicon dioxide and polytetrafluoroethylene.
5. A process for preparing a low-flow-mark aluminum pigment for plastics as claimed in any of claims 1 to 4, which comprises: comprises the following steps
a. All the materials are put into the kneader according to the proportion, and the total amount of the materials is controlled to be less than 2/3 of the volume of the stirring box of the kneader;
b. adjusting the temperature of the kneader to 50-70 ℃, turning on a vacuum pump, pumping the vacuum degree of the kneader to be below-0.08 MPa, adjusting the rotating speed of the kneader to 10-30r/min, and stirring for 4-6 h;
c. stopping heating and stirring after stirring, keeping the vacuum degree, cooling to normal temperature, taking out the mixture, and sieving with a 40-100 mesh sieve to obtain the finished product.
6. The method for preparing the low flow mark aluminum pigment for plastics according to claim 5, wherein the method comprises the following steps: the kneader is selected from a vacuumizing heating kneader.
CN201710970912.5A 2017-10-18 2017-10-18 Low-flow-mark aluminum pigment for plastics and preparation method thereof Active CN107629296B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109851881A (en) * 2019-01-29 2019-06-07 安徽天易金属新材料有限公司 A kind of dedicated high brightness ultra-thin aluminium pigment of plastic cement and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787162A (en) * 2009-11-12 2010-07-28 上海锦湖日丽塑料有限公司 Aesthetical resin capable of eliminating injection-molding weld lines and preparation method thereof
CN102464847A (en) * 2010-11-15 2012-05-23 上海锦湖日丽塑料有限公司 Resin composition and preparation method thereof
CN103112096A (en) * 2012-12-14 2013-05-22 上海锦湖日丽塑料有限公司 Method for preparing coating-free aesthetic resin with improved appearance
CN105566726A (en) * 2016-02-02 2016-05-11 合肥旭阳铝颜料有限公司 Strip aluminum pigment and preparation method thereof
CN105968683A (en) * 2016-07-27 2016-09-28 合肥旭阳铝颜料有限公司 Strip-shaped aluminum pigment with smooth surface and few flow marks

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787162A (en) * 2009-11-12 2010-07-28 上海锦湖日丽塑料有限公司 Aesthetical resin capable of eliminating injection-molding weld lines and preparation method thereof
CN102464847A (en) * 2010-11-15 2012-05-23 上海锦湖日丽塑料有限公司 Resin composition and preparation method thereof
CN103112096A (en) * 2012-12-14 2013-05-22 上海锦湖日丽塑料有限公司 Method for preparing coating-free aesthetic resin with improved appearance
CN105566726A (en) * 2016-02-02 2016-05-11 合肥旭阳铝颜料有限公司 Strip aluminum pigment and preparation method thereof
CN105968683A (en) * 2016-07-27 2016-09-28 合肥旭阳铝颜料有限公司 Strip-shaped aluminum pigment with smooth surface and few flow marks

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