CN110301831B - Pot cover, spraying-free cover body and preparation method - Google Patents
Pot cover, spraying-free cover body and preparation method Download PDFInfo
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- CN110301831B CN110301831B CN201910676403.0A CN201910676403A CN110301831B CN 110301831 B CN110301831 B CN 110301831B CN 201910676403 A CN201910676403 A CN 201910676403A CN 110301831 B CN110301831 B CN 110301831B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/06—Lids or covers for cooking-vessels
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- 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
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Closures For Containers (AREA)
Abstract
The invention discloses a pot cover, a spraying-free cover body and a preparation method. Wherein, the whole appearance of exempting from spraying lid is circular or convex, the upper surface of lid has many concentric circular-arc wales, the lid is by exempting from spraying plastics injection moulding, exempt from spraying plastics including the composition of following mass fraction: 60-100 parts of PP resin, 0.1-5 parts of pearl powder, 0.05-2 parts of aluminum paste, 1-25 parts of mineral powder, 0.5-5 parts of lubricant, 0.2-5 parts of antioxidant and 0.2-2 parts of coupling agent. The invention avoids the surface defects such as flow lines and the like, improves the reflection ratio of light by arranging the pearl powder on the surface of the cover body in different angles or/and different states, ensures that the outer surface of the cover body presents high-gloss silver color, realizes that the surface of the cover body presents high-gloss silver color effect close to a spraying process, has physical properties and lower cost, and has better application prospect.
Description
Technical Field
The invention relates to the field of plastic products, in particular to a spraying-free cover body, a preparation method and a pot cover with the spraying-free cover body.
Background
Particularly, in various household appliances, metallic silver is a product color which is favored by consumers. Usually, a silver coating is coated on the outer surface of the plastic product by post-processing means such as spraying and the like to realize metallic silver. However, the spraying process not only pollutes the environment, but also has the problems of more production links, high production cost and the like. With the improvement of the national requirement on environmental protection, the spraying industry is controlled more and more, most of spraying-free plastics on the market are realized simply by adding color master and dyeing granulation, but when the spraying-free plastics are used for preparing plastic products, surface defects such as flow lines, welding lines and the like are easily generated on the surfaces, and the appearance visual effect of the plastic products is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a spraying-free cover body, a preparation method thereof and a pot cover with the spraying-free cover body.
The invention provides a spraying-free cover body, wherein the whole appearance of the cover body is circular or arc-shaped, the upper surface of the cover body is provided with a plurality of concentric arc-shaped convex lines, the cover body is formed by injection molding of spraying-free plastics, and the spraying-free plastics comprise the following components in parts by mass: 60-100 parts of PP resin, 0.1-5 parts of pearl powder, 0.05-2 parts of aluminum paste, 1-25 parts of mineral powder, 0.5-5 parts of lubricant, 0.2-5 parts of antioxidant and 0.2-2 parts of coupling agent.
The invention makes the whole appearance of the cover body be round or circular arc, provides a basis for realizing that molten plastic flows in the cavity of the mold in the guiding way of the inner wall of the cavity when the spraying-free plastic is used for injection molding, thereby the pearl powder is arranged on the surface of the cover body in different angles or/and different states, the surface defects such as flow lines and the like are avoided, and the reflection ratio of light is improved by arranging the pearl powder on the surface of the cover body in different angles or/and different states, the outer surface of the cover body is in high-gloss silver color, and the high-gloss silver effect close to the spraying process is realized on the surface of the cover body. And, set up a plurality of convex patterns on the lid upper surface and be favorable to increasing the reflection of light area of lid, further improve the high bright silver-colored effect of lid upper surface. Moreover, the cover body is made of spraying-free plastics, and the spraying-free plastics have good physical properties and lower cost, so that the spraying-free plastic has a better implementation and application prospect.
In a preferred embodiment, the shape of the ribs corresponds to the overall shape of the cover, and both the cover and the ribs are circular or circular arc-shaped.
In a preferred embodiment, a plurality of said ribs are provided on the upper surface of said cover in a uniformly spaced concentric arrangement.
In a preferred embodiment, the mineral powder is one or a mixture of several of silicate inorganic substances, calcium carbonate inorganic substances and barium inorganic substances according to any proportion, and the pearl powder is formed by coating mica sheets with TiO 2.
In a preferred embodiment, the lubricant is one or a mixture of several of amide lubricant, stearic acid lubricant and waxy lubricant according to any proportion.
Correspondingly, the invention discloses a pot cover which comprises a bottom cover, wherein a handle part is convexly arranged on the bottom cover, and the upper end surface of the handle part is provided with a spraying-free cover body.
In addition, the invention relates to a preparation method of the spraying-free cover body, which comprises the following steps:
generating spraying-free plastic in a molten state, wherein the spraying-free plastic comprises the following components in parts by mass: 60-100 parts of PP resin, 0.1-5 parts of pearl powder, 0.05-2 parts of aluminum paste, 1-25 parts of mineral powder, 0.5-5 parts of lubricant, 0.2-5 parts of antioxidant and 0.2-2 parts of coupling agent;
injecting the spraying-free plastic into a glue injection port of the mold in a molten state, and utilizing the mold cavity of the mold for molding to produce the cover body, wherein the mold cavity is circular or arc-shaped, the top cavity wall of the mold cavity is provided with a plurality of concentric arc-shaped concave grains, and the glue injection port is communicated with one side edge of the mold cavity.
When the spraying-free plastic is used for preparing the circular or arc-shaped cover body through injection molding, the molten plastic flows in the mold cavity of the mold by taking a plurality of concentric arc-shaped concave grains on the inner wall of the mold cavity and the top cavity wall of the mold cavity as a guide, so that the molten plastic flows in a circular or arc-shaped path to generate a centripetal force, the centripetal force destroys the ordered arrangement of the pearl powder in the molten plastic, avoids surface defects such as generation of flow lines and the like, improves the reflection ratio of light rays by arranging the pearl powder on the surface of the cover body in different angles or/and different states, and ensures that the outer surface of the cover body presents high-gloss and silvery. Compared with the process for realizing the metallic bright silvery color on the outer surface of the plastic product by spraying in the prior art, the method has the advantages of few process links, simple process and low realization cost.
In a preferred embodiment, the spraying-free plastic is prepared into prefabricated particles, and the prefabricated particles are added into an injection molding machine to produce the spraying-free plastic in a molten state.
In a preferred embodiment, the step of preparing the spray-free plastic into prefabricated particles comprises:
uniformly mixing pearl essence, aluminum paste, a lubricant and an antioxidant, fully dispersing the lubricant in the pearl essence and the aluminum paste, adding PP resin, mineral powder and a coupling agent, and mixing for 3-5 minutes in a mixer to obtain a mixture;
extruding and granulating the mixture at the processing temperature of 180-210 ℃ through a double-screw extruder to obtain the prefabricated granules of the spraying-free plastic.
In a preferred embodiment, the side edge of the cover body is provided with a fastener extending downwards, and the glue injection port is arranged at the position of the mold cavity corresponding to the fastener.
Drawings
Fig. 1 is a schematic external view of a cover in one embodiment.
Fig. 2 is a schematic structural view of the pot lid.
Fig. 3 is a structural view of the bottom cover of the pot cover.
Fig. 4 is a schematic view of a handle top cover as a cover body.
Fig. 5 is a schematic vertical cross-sectional view of the handle top cover.
Detailed Description
To further clarify the technical solutions and effects adopted by the present application to achieve the intended purpose, the following detailed description is given with reference to the accompanying drawings and preferred embodiments according to the present application. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in figure 1, the invention discloses a spraying-free cover body 2 which directly realizes the metallic silver color on the outer surface through injection molding, and the outer surface of the spraying-free cover body has the metallic silver color effect close to spraying. The whole appearance of the cover body 2 is circular or arc-shaped, the whole appearance is silver in visual sense, and the upper surface of the cover body is provided with a plurality of concentric arc-shaped convex patterns 21. Preferably, the shape of the convex pattern 21 is consistent with the overall shape of the cover body 2, that is, the cover body 2 and the convex pattern 21 are both circular or arc-shaped; and, a plurality of ribs 21 are concentrically arranged on the upper surface of the cover body 2 at the same interval uniformly. For example, the handle top cover 2 shown in fig. 1 has a circular shape, and the upper surface thereof has a plurality of concentric circular ridges 21 arranged uniformly.
The characteristics, functions and preparation method of the lid body 2 are further described by preparing the lid body 2 as an upper handle lid on the pot lid with reference to fig. 2-5. In one embodiment, the pot lid comprises a bottom lid 1 and the above-mentioned spray-free lid body 2, wherein the bottom lid 1 has a protruding handle portion 11, an upper end surface of the handle portion 11 is injection molded with the lid body 2 by an injection molding machine, and the lid body 2 serves as a top cover or an upper cover of the handle portion 11 and is also called a handle upper cover. The bottom cover 1 is generally made of plastic, glass or stainless steel, the handle 11 is generally made of plastic or metal, the handle 11 is fixed in the middle of the bottom cover 1, the handle 11 is provided with a clamping hole 12, and the side edge of the cover 2 is provided with a downwardly extending buckle 22, the buckle 22 is buckled in the clamping hole 12, so that the cover 2 is fixed on the upper end surface of the handle 11.
Wherein, the cover body 2 is formed by injection molding of spraying-free plastics through an injection molding machine. The spraying-free plastic comprises the following components in parts by mass: 60-100 parts of PP resin, 0.1-5 parts of pearl powder, 0.05-2 parts of aluminum paste, 1-25 parts of mineral powder, 0.5-5 parts of lubricant, 0.2-5 parts of antioxidant and 0.2-2 parts of coupling agent.
The mineral powder is one or a mixture of several of silicate inorganic substances, calcium carbonate inorganic substances and barium inorganic substances according to any proportion. The addition of a proper amount of mineral powder in the formula can reduce the material cost of the spraying-free plastic.
The pearl powder, also called pearl pigment, is formed by coating mica with one or more metal oxide thin layers, and the pearl powder formed by coating mica sheets with TiO2 is preferred in the invention.
The aluminum paste (English name: aluminum paste, flash paste, silver paste) is a paste pigment with the granularity of 10nm-300nm, the main components of the paste pigment are snowflake aluminum particles and a petroleum solvent, the paste pigment has excellent light reflection capability and metal luster, the paste pigment is mixed with transparent color pigment for use, a paint film has an obvious angle-dependent heterochromatic effect, the decorative effect is very gorgeous and attractive, and the imitation electroplating effect of spraying-free plastics can be enhanced by using the aluminum paste.
The antioxidant is one or a mixture of several of antioxidant 1010, antioxidant 168 and antioxidant 1076 in any proportion.
The coupling agent is mineral oil or silicone oil or a mixture of the mineral oil and the silicone oil according to any proportion.
The lubricant is one or a mixture of several of amide lubricant, stearic acid lubricant and waxy lubricant according to any proportion. The lubricant provides lubrication for the pearl powder and the aluminum paste, and can promote the pearl powder and the aluminum paste to be uniformly dispersed in the plastic.
The preparation method of the upper spraying-free plastic comprises the following steps: firstly, taking the following components in parts by mass: 60-100 parts of PP resin, 0.1-5 parts of pearl powder, 0.05-2 parts of aluminum paste, 1-25 parts of mineral powder, 0.5-5 parts of lubricant, 0.2-5 parts of antioxidant and 0.2-2 parts of coupling agent. The preparation method comprises the steps of uniformly mixing the pearl powder, the aluminum silver paste, the lubricant and the antioxidant, fully dispersing the lubricant in the pearl powder and the aluminum silver paste, adding the PP resin, the mineral powder and the coupling agent, mixing for 3-5 minutes in a mixer to obtain a mixture, and extruding and granulating the mixture at the processing temperature of 180-210 ℃ through a double-screw extruder to obtain the spraying-free plastic prefabricated particles.
The prepared prefabricated particles of the spraying-free plastic can be used for preparing the cover body 20 by injection molding, and the preparation method comprises the following steps: firstly, the prefabricated particles of the spraying-free plastic are added into an injection molding machine (wherein the temperature of a charging barrel of the injection molding machine is 180-. Secondly, injecting the spraying-free plastic into a glue injection port of a mold through an injection molding machine in a molten state, wherein the mold is provided with a mold cavity for molding the cover body 2, one side edge of the mold cavity is provided with the glue injection port, the mold cavity is circular or arc-shaped, and the top cavity wall of the mold cavity is provided with a plurality of concentric arc-shaped concave grains; after the molten plastic is injected into a mold cavity of the mold from the glue injection port, the molten plastic flows along the inner wall of the mold cavity from two sides of the glue injection port respectively, and because the mold cavity is circular or arc-shaped, the mold cavity and a plurality of concentric arc-shaped concave grains can generate a guiding effect on the flow of the molten plastic, and the molten plastic flows along the inner wall of the mold cavity from two sides of the glue injection port respectively in clockwise and anticlockwise directions until the mold cavity is filled finally, so that the maximum path of the flow of the molten plastic in the mold cavity is the perimeter of half of the mold cavity, namely, the molten plastic moves 180 degrees in an arc shape; furthermore, the molten plastic generates a centripetal force in the flowing process along the circular or circular arc-shaped mold cavity, and the centripetal force enables the pearl powders 24 in the molten plastic to be arranged in different angles or/and different states, so that the plurality of pearl sheets 24 positioned on the outer surface of the cover body 2 can reflect light outwards towards various angles to improve the reflection ratio of the light, and the outer surface of the cover body 2 presents a high-gloss silver color.
The molten plastic is filled in the mold cavity, the plurality of concentric circular arc concave veins on the top cavity wall of the mold cavity enable the upper surface of the molded cover body 2 to be correspondingly provided with a plurality of concentric circular arc convex veins 21, and the convex veins 21 increase the surface area of the upper surface of the cover body 2, namely increase the size of the reflecting surface of the cover body 2; moreover, because the molten plastic flows along the concave lines under the action of centripetal force, the pearl powder 24 is arranged on the convex lines 21 at different angles or/and different states, not only surface defects such as flow lines and the like on the outer surface of the cover body 2 are avoided, but also the pearl powder 24 enables the convex lines 21 to have better light reflection rate at each angle, and the outer surface of the cover body 2 is ensured to present high-gloss silver color.
As shown in fig. 4, a glue injection port 23 may be formed at a position corresponding to the buckle 22 in the mold cavity, so that the glue injection port 23 is far away from a top cavity wall of the mold cavity, and the influence of surface defects easily generated at the glue injection port 23 on the overall appearance of the cover body 2 is avoided.
In addition, the spraying-free plastic has better physical properties, so that the prepared cover body also has better physical properties.
Example 1 of spray-free plastics: 96.5 parts of PP resin, 0.2 part of pearl powder, 0.1 part of aluminum paste, 2 parts of mineral powder, 0.5 part of lubricant, 0.2 part of antioxidant and 0.5 part of coupling agent.
Example 2 of spray-free plastics: 91.2 parts of PP resin, 0.5 part of pearl powder, 0.3 part of aluminum paste, 7 parts of mineral powder, 1 part of lubricant, 0.3 part of antioxidant and 0.3 part of coupling agent.
Example 3 of spray-free plastics: 60 parts of PP resin, 0.1 part of pearl powder, 0.05 part of aluminum paste, 1 part of mineral powder, 0.5 part of lubricant, 0.2 part of antioxidant and 0.2 part of coupling agent.
Example 4 of spray-free plastics: 100 parts of PP resin, 5 parts of pearl powder, 2 parts of aluminum paste, 25 parts of mineral powder, 5 parts of lubricant, 5 parts of antioxidant and 2 parts of coupling agent.
Example 5 of spray-free plastics: 100 parts of PP resin, 2 parts of pearl powder, 2 parts of aluminum paste, 25 parts of mineral powder, 0.5 part of lubricant, 1 part of antioxidant and 2 parts of coupling agent.
A plurality of experimental samples with the specification of 20mmx10mmx3mm were prepared by injection molding from PP resin and the spray-free plastics obtained in examples 1 to 5, respectively, and the experimental samples prepared from PP resin were used as comparative groups in examples 1 to 5. Wherein the temperature of a charging barrel of the injection molding machine is 180 ℃ and 230 ℃, the injection pressure is 70MPa, the injection speed is 65 percent, and the temperature of a hot runner is 230 ℃. In addition, the test standards used for the tests performed on each experimental sample were as follows: the tensile strength (MPa) is measured according to ISO 527 standard, the bending strength (MPa) is measured according to ISO 178 standard, and the impact strength (KJ/m)2) The surface defects such as flow marks and the like are automatically visually observed by adopting ISO 180 standard, and the test results are shown in the following table 1:
| experimental sample | Tensile Strength (MPa) | Flexural Strength (MPa) | Impact Strength (KJ/m)2) | Surface defects |
| Comparison group | 31.4 | 37.1 | 4.1 | / |
| Example 1 | 30.1 | 36.6 | 3.5 | Is free of |
| Example 2 | 30.2 | 36.2 | 2.9 | Is free of |
| Example 3 | 30.7 | 36.8 | 3.6 | Is free of |
| Example 4 | 29.4 | 35.1 | 2.1 | Is free of |
| Example 5 | 28.2 | 34.3 | 2.1 | Is free of |
TABLE 1
Therefore, the physical properties of the cap body 2 prepared by using the spray-free plastics of examples 1 to 5 are substantially different from those of the PP resin, and the excellent physical properties of the PP resin are substantially maintained, so that the cap body has a good application prospect.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A preparation method of a spraying-free cover body is characterized by comprising the following steps:
generating spraying-free plastic in a molten state, wherein the spraying-free plastic comprises the following components in parts by mass: 60-100 parts of PP resin, 0.1-5 parts of pearl powder, 0.05-2 parts of aluminum paste, 1-25 parts of mineral powder, 0.5-5 parts of lubricant, 0.2-5 parts of antioxidant and 0.2-2 parts of coupling agent;
will exempt from spraying plastics in injecting mould's die cavity from injecting glue mouth injection mould under molten state, the die cavity is circular or convex, the top cavity wall of die cavity has many concentric circular-arc concave lines, the injecting glue mouth with a side of die cavity is linked together to make fused spraying plastics follow the both sides of injecting glue mouth respectively follow concave line direction flow will the die cavity is filled up, and final injection moulding makes whole appearance be circular or convex and the upper surface has the lid of many concentric circular-arc convex ridges.
2. The method for preparing a spray-free cover body according to claim 1, wherein the step of preparing the spray-free plastic into prefabricated particles comprises the following steps:
uniformly mixing pearl essence, aluminum paste, a lubricant and an antioxidant, fully dispersing the lubricant in the pearl essence and the aluminum paste, adding PP resin, mineral powder and a coupling agent, and mixing for 3-5 minutes in a mixer to obtain a mixture;
extruding and granulating the mixture at the processing temperature of 180-210 ℃ through a double-screw extruder to obtain the prefabricated granules of the spraying-free plastic.
3. The manufacturing method of the spraying-free cover body as claimed in claim 1, wherein a fastener extending downwards is arranged on the side edge of the cover body, and the glue injection port is arranged at a position of the mold cavity corresponding to the fastener.
4. The method for manufacturing a spray-free cover body according to claim 1, wherein the shape of the convex patterns is consistent with the overall shape of the cover body, and the cover body and the convex patterns are both circular or arc-shaped.
5. The method of making a spray-free cover according to claim 1, wherein a plurality of said ribs are uniformly spaced and concentrically arranged on the upper surface of said cover.
6. The method for producing a spray-free cover according to claim 1, wherein the mineral powder is a silicate-based inorganic substance, a calcium carbonate-based inorganic substance, or a mixture thereofOf barium-based inorganic substancesOne or a mixture of several of the above materials in any proportion, wherein the pearl powder is formed by coating mica sheets with TiO2。
7. The method for preparing a spray-free cover body according to claim 1, wherein the lubricant is one or a mixture of several of an amide lubricant, a stearic acid lubricant and a waxy lubricant in any proportion.
8. A pot lid comprising a bottom lid having a protruding handle portion, wherein the handle portion has a lid body formed on the upper end surface thereof by the method of manufacturing a spray-free lid body according to any one of claims 1 to 7.
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| CN201910676403.0A CN110301831B (en) | 2019-07-25 | 2019-07-25 | Pot cover, spraying-free cover body and preparation method |
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| CN107722446A (en) * | 2017-10-31 | 2018-02-23 | 四川长虹电器股份有限公司 | Polypropylene material and preparation method thereof with high glaze, low linear expansion coefficient |
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2019
- 2019-07-25 CN CN201910676403.0A patent/CN110301831B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2566771Y (en) * | 2001-10-17 | 2003-08-20 | 海因里希-贝尔恩斯家庭技术股份公司 | Lid for preventing liquid blowout |
| CN101416837A (en) * | 2007-10-27 | 2009-04-29 | Sar控股国际有限公司 | Silicone Steamer |
| CN102464857A (en) * | 2010-11-15 | 2012-05-23 | 上海锦湖日丽塑料有限公司 | Extrusion grade aesthetical resin possessing metal color effect and its preparation method |
| CN203619385U (en) * | 2013-09-16 | 2014-06-04 | 钱桂坚 | Vacuum insulated food jar with double handles |
| CN104693602A (en) * | 2015-03-15 | 2015-06-10 | 蔡勤勤 | High-flowability high-glossiness no-surface-defect colored metallic-pearl-effect spraying-free polypropylene automobile material and preparation method thereof |
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| CN110301831A (en) | 2019-10-08 |
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