CN109553966B - Electroplatable high-density plastic composition, high-density plastic product and preparation method - Google Patents
Electroplatable high-density plastic composition, high-density plastic product and preparation method Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/54—Electroplating of non-metallic surfaces
- C25D5/56—Electroplating of non-metallic surfaces of plastics
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- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
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- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention belongs to the technical field of plastic product preparation, and particularly relates to an electroplatable high-density plastic composition, a high-density plastic product and a preparation method thereof. The invention provides a high-density plastic composition, which comprises the following components: 22-40wt% of polymer composition, 59-77wt% of mineral powder composition and 0.1-1.5wt% of coupling agent; wherein the polymer composition comprises: 1-2% by weight of polyamide 6([ NH- (CH)2)5‑CO]N) 7-21 wt.% of polyamide 66([ NH- (CH)2)6‑NH‑CO‑(CH2)4‑CO]N) And 5 to 10 weight percent of an aliphatic polyamide; the mineral powder composition comprises: 30-50wt% of barium sulfate, 5-15wt% of calcium carbonate, and 2-13wt% of cerium dioxide; the coupling agent is at least one selected from silane coupling agent, titanate coupling agent, aluminate coupling agent and organic chromium complex coupling agent. The high-density plastic product prepared from the high-density plastic composition has obvious metal texture.
Description
Technical Field
The invention belongs to the technical field of plastic product preparation, and particularly relates to an electroplatable high-density plastic composition, a high-density plastic product and a preparation method thereof.
Background
Plastics have been widely used in many areas related to daily necessities, such as home appliances, sanitary equipment, kitchen equipment, and the like. Although the plastic product is lighter and lower in cost than the metal product, the plastic product is not wear-resistant and is easy to give a cheap feeling. Therefore, a method for metallizing the surface of the plastic substrate is developed, which is not only corrosion resistant and wear resistant, but also beautiful.
As described in the specification of chinese patent No. CN102978672, "a method for local electroplating of plastic surface", the plastic substrate itself is not conductive, so a vacuum plating method, i.e., Physical Vapor Deposition (PVD), is required to plate a conductive layer on the non-conductive plastic substrate, and then a surface metallization process is performed according to a general electroplating process. Alternatively, according to the specification of taiwan patent No. 524897 "manufacturing method of metal ‧ plastic composite", conductive fibers having conductivity are mixed into a non-conductive plastic material, and the plastic product is subjected to physical roughening and chemical roughening, and then surface treatment is performed by electroless metal plating.
Although the above-mentioned methods can overcome the non-conductive property of the plastic substrate itself and enable the surface to be metallized, the additional vacuum plating process or the addition of conductive fibers can greatly increase the manufacturing cost, and further increase the product price, which is not favored by consumers. More importantly, the plastic base material has lower density, so that the electroplated plastic base material has metal appearance and aesthetic feeling, but the whole weight is about the same as that of a common plastic product, and the electroplated plastic base material does not have the heavy and stable feeling of metal, so that the improvement of the texture is limited.
Disclosure of Invention
The invention mainly aims to provide an electroplatable high-density plastic composition, and aims to improve the metal texture of a plastic product and reduce the preparation cost.
Another object of the present invention is to provide a high-density plastic product capable of being electroplated, and the purpose is to provide a high-density plastic product with metallic texture.
The invention also aims to provide the preparation method of the electroplatable high-density plastic product, which aims to optimize the preparation process and reduce the preparation cost.
In order to achieve the purpose, the aliphatic polyamide is mixed into the non-conductive plastic, so that the characteristic that the plastic is difficult to electroplate is changed, and the surface of the finished product can be electroplated; meanwhile, the density of the product is improved by mixing the high-density mineral powder composition, so that the weight and the texture of the product are increased. Accordingly, the present invention provides an electroplatable high-density plastic composition comprising: 22-40wt% of polymer composition, 59-77wt% of mineral powder composition and 0.1-1.5wt% of coupling agent;
wherein the polymer composition comprises: 1-2% by weight of polyamide 6([ NH- (CH)2)5-CO]N) 7-21 wt.% of polyamide 66([ NH- (CH)2)6-NH-CO-(CH2)4-CO]N) And 5 to 10 weight percent of an aliphatic polyamide;
the mineral powder composition comprises: 30-50wt% of barium sulfate, 5-15wt% of calcium carbonate, and 2-13wt% of cerium dioxide;
the coupling agent is at least one selected from silane coupling agent, titanate coupling agent, aluminate coupling agent and organic chromium complex coupling agent.
Preferably, the polymer composition further comprises 5 to 11wt% of an aromatic polyamide, wherein the aromatic polyamide is at least one selected from the group consisting of polyhexamethylene terephthalamide, poly-p-phenylene terephthalamide, and poly-1, 9-nonylene terephthalamide.
Preferably, the polyamide 66 is present in an amount of 15-21% or 7-13% by weight.
Preferably, the aliphatic polyamide is polytetramethylene adipamide.
In another aspect of the present invention, there is provided an electroplatable high-density plastic article comprising: a plastic body; the raw material for preparing the plastic body comprises the high-density plastic composition.
Preferably, the surface of the plastic body is coated with a metal plating layer.
Preferably, the high density plastic article is used as a sanitary fitting.
Preferably, the sanitary fitting comprises: one of a faucet body, a shower body and a handle.
In still another aspect of the present invention, there is provided a method for preparing an electroplatable high-density plastic article, comprising:
screening a mineral powder composition with the particle size of 0.1-1.0 mu m, and carrying out surface modification on the mineral powder composition by adopting a coupling agent;
mixing polyamide 6, polyamide 66 and aliphatic polyamide, and dehydrating in vacuum to prepare a high polymer composition;
mixing the polymer composition and the mineral powder composition subjected to surface modification to obtain a high-density plastic primary finished product;
cutting the high-density plastic primary finished product into particles and drying to obtain high-density plastic with the density of 2.5-3.2g/cm 3;
molding the high-density plastic to obtain a first high-density plastic product;
puffing and coarsening the surface of the first high-density plastic product to obtain a first high-density plastic product subjected to surface treatment;
and performing palladium activation and reduction to form a metal coating on the surface of the first high-density plastic product subjected to surface treatment.
Preferably, the coupling agent is used for surface modification of the mineral powder composition in a coating, spraying or misting manner; or, soaking the mineral powder composition into the coupling agent for surface modification.
Preferably, the mineral powder composition comprises calcium sulfate, barium sulfate, and at least one of zirconium dioxide and cerium oxide.
Preferably, the coupling agent is selected from at least one of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, and an organochromium complex coupling agent.
Preferably, the step of formulating the polymer composition further comprises: adding aromatic polyamide. The aromatic polyamide is selected from at least one of polyhexamethylene terephthalamide, poly-p-phenylene terephthalamide and poly-1, 9-nonylene terephthalamide.
Preferably, the aliphatic polyamide is polytetramethylene adipamide.
Preferably, the step of forming a metal plating layer on the surface of the surface-treated plastic article includes: plating a nickel layer on the surface of the plastic product subjected to surface treatment by adopting nickel-phosphorus alloy plating solution without ammonia, wherein the thickness of the nickel layer is 0.3 mu m; then, a pre-plated nickel layer or a pre-plated copper layer with the thickness of 2-5 mu m, a copper acid plating layer with the thickness of 20 mu m, a bright nickel plating layer with the thickness of 12 mu m and a bright chromium plating layer with the thickness of 0.3 mu m are sequentially plated on the surface of the nickel layer, which is far away from the plastic product.
Drawings
In order to make the technical solution, objects, features, advantages and embodiments of the present invention more comprehensible, the following drawings illustrate the present invention:
FIG. 1 is a flow chart of a method for making an electroplatable high density plastic article according to one embodiment of the present invention;
fig. 2 is a water faucet body prepared by the method for preparing the electroplatable high-density plastic product in one embodiment of the invention;
FIG. 3 is a view of a shower body manufactured by the method for manufacturing an electroplatable high-density plastic product according to the invention in one embodiment of the invention;
FIG. 4 is a view of a handle made by the method for making an electroplatable high-density plastic article according to the present invention in one embodiment of the present invention;
FIG. 5 is an enlarged cross-sectional view of the plastic body and the metal plating layer of the high density plastic product of FIGS. 2-4.
Reference numerals: plastic body 1, metal coating 2, tap body 10, gondola water faucet body 20, handle 30.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention provides an electroplatable high-density plastic composition, which comprises: 22-40wt% of polymer composition, 59-77wt% of mineral powder composition and 0.1-1.5wt% of coupling agent;
wherein the polymer composition comprises: 1-2% by weight of polyamide 6([ NH- (CH)2)5-CO]N) 7-21 wt.% of polyamide 66([ NH- (CH)2)6-NH-CO-(CH2)4-CO]N) And 5 to 10 weight percent of an aliphatic polyamide;
the mineral powder composition comprises: 30-50wt% of barium sulfate, 5-15wt% of calcium carbonate, and 2-13wt% of cerium dioxide;
the coupling agent is at least one selected from silane coupling agent, titanate coupling agent, aluminate coupling agent and organic chromium complex coupling agent.
According to an embodiment of the present invention, the aliphatic polyamide is polytetramethylene adipamide (PA 46) which is used as a sacrificial agent for polymer electroplating and can be decomposed in an acidic environment to improve the characteristic that a finished product made of general plastics is not easy to electroplate.
According to another embodiment of the present invention, the polymer composition further comprises 5 to 11wt% of an aromatic polyamide having a density of 1.65g/cm3(ii) a Wherein the aromatic polyamide is at least one selected from the group consisting of polyhexamethylene terephthalamide (PA 6T), polyparaphenylene terephthalamide (PPA) and poly-1, 9-nonyleneterephthalamide (PA 9T).
The mineral powder composition contains 30-50wt% of barium sulfate (BaSO)4Density 4.5g/cm3) 5-15wt% of calcium carbonate (CaCO)3Density 2.71g/cm3) And 2-13wt% of cerium oxide (CeO)2Density 7.22g/cm3). The density of the finished product prepared from the high-density plastic composition is between 2.5 and 3.2g/cm by mixing the mineral powder or/and the ceramic powder3So as to increase the weight and the texture of the finished product, and the mineral powder is easy to obtain and has low cost.
Since 59-78wt% of inorganic (mineral powder) material is mixed in the high-density plastic composition of the present invention, the mechanical toughness of the finished product is poor, and therefore, the coupling agent is added in the high-density plastic composition of the present invention to improve the mechanical toughness of the finished product made of the high-density plastic composition of the present invention. Wherein the coupling agent is at least one of silane coupling agent, titanate coupling agent, aluminate coupling agent and organic chromium complex coupling agent.
In another aspect, the present invention also provides an electroplatable high-density plastic product made of the above electroplatable high-density plastic composition, comprising: a plastic body; the surface of the plastic body is coated with a metal coating.
Preferably, the high-density plastic product can be used for preparing sanitary fittings, such as a faucet body, a shower body or a handle.
In yet another aspect, the present invention provides a method for preparing an electroplatable high-density plastic product, comprising:
screening a mineral powder composition with the particle size of 0.1-1.0 mu m, and carrying out surface modification on the mineral powder composition by adopting a coupling agent;
mixing polyamide 6, polyamide 66 and aliphatic polyamide, and dehydrating in vacuum to prepare a high polymer composition;
mixing the polymer composition and the mineral powder composition subjected to surface modification to obtain a high-density plastic primary finished product;
cutting the high-density plastic primary finished product into particles and drying to obtain the high-density plastic primary finished product with the density of 2.5-3.2g/cm3The high-density plastic of (3);
molding the high-density plastic to obtain a first high-density plastic product;
puffing and coarsening the surface of the first high-density plastic product to obtain a first high-density plastic product subjected to surface treatment;
and performing palladium activation and reduction to form a metal coating on the surface of the first high-density plastic product subjected to surface treatment.
Specifically, as shown in the flow chart of fig. 1, first, a mineral powder composition having a median particle diameter of 0.1 to 1.0 μm is screened (step 110). If the particle diameter is too large, injection molding tends to be poor; on the contrary, if the particle size is too small, agglomeration is easily generated, which causes uneven distribution of the mineral powder in the plastic.
Next, the ore fines composition is surface modified with a coupling agent (step 120). According to an embodiment of the present invention, the coupling agent is applied to the surface of the mineral powder by spraying or misting the coupling agent, or soaking the mineral powder in the coupling agent, so as to enhance the affinity and adhesion between the mineral powder and the polymer.
Polyamide 6, polyamide 66, aromatic polyamide and aliphatic polyamide are placed in a high-speed mixer having a sealing and vacuum device, and high-speed mixing and vacuum dehydration are performed to obtain a polymer composition (step 130). Wherein the aromatic polyamide is at least one of polyhexamethylene terephthalamide (PA 6T), poly (p-phenylene terephthalamide) (PPA) and poly (1, 9-nonylene terephthalamide) (PA 9T).
Then, the polymer composition and the surface-modified ore powder composition are fed into a twin-screw extruder by a composite kneading belt and kneaded into a high-density plastic (step 140). Finally, the high-density plastic is granulated (step 150) and dried (step 160) by a granulator and a dryer to form the high-density plastic, and the density of the high-density plastic is 2.5-3.2g/cm3Can be used for manufacturing sanitary fittings, such as a faucet body, a shower body, a handle and the like.
Then, after the high-density plastic is made into a plastic product by plastic injection molding or other molding methods (step 170), a swelling agent is added to improve the surface activity and increase the adhesion property of the plating layer. Then, the surface of the plastic product is roughened with a roughening solution composed of a mixed chemical of chromic acid and sulfuric acid and a trace amount of chemical additives (step 180). However, not all of the inorganic substances (ore powder) can be dissolved by the roughening solution, so that the swelling agent added can effectively increase the dissolution rate of the components which are not easily dissolved by the roughening solution to achieve the purpose of roughening. The components and the proportion of the swelling agent and the coarsening liquid can be adjusted according to the components and the proportion of the mineral powder, in the embodiment, chromic acid and sulfuric acid are used for about 1:1, and a special swelling agent (an acid interface activating solvent) is added for about 0.2-0.5 percent to achieve good electroplating quality.
Then, palladium activation and reduction are carried out (step 190), then, a chemical nickel layer is plated on the surface of the plastic product by nickel-phosphorus alloy plating solution without ammonia, the thickness is about 0.3 μm, and then a pre-plated nickel layer or a pre-plated copper layer with the thickness of 2-5 μm, a copper acid plated layer with the thickness of 20 μm, a smooth nickel plated layer with the thickness of 12 μm and a bright chromium plated layer with the thickness of 0.3 μm are sequentially plated, and a metal plating layer is formed by the nickel layer, the pre-plated nickel layer or the pre-plated copper layer, the copper acid plated layer, the smooth nickel plated layer and the bright chromium plated layer (step 200). The plastic product with metal coating on the surface has not only metallic texture and weight feeling, but also water corrosion resistance, and can be used to form a bathroom accessory. The sanitary fitting comprises: the faucet body 10, the shower body 20, the handle 30, and the like, as shown in fig. 2 to 5, include: a plastic body 1 made of high-density plastic composition and a metal plating layer 2 formed by coating the surface.
Table 1 shows the composition and characteristics of the components of examples 1 to 5. By comparing example 4 with example 5, it can be seen that when 22-41wt% of polymer composition, 59-78wt% of mineral powder and less than 1wt% of coupling agent are reacted, the product has good toughness and the surface can be electroplated.
TABLE 1
| Examples | Proportion of Polymer composition (wt%) | PA6 (wt%) | PA66 (wt%) | Aromatic polyamide (wt%) | Aliphatic polyamide powder (wt%) | Coupling agent (wt%) |
| 1 | 40-60 | 38.6 | 0 | 0 | 0 | <1.5 |
| 2 | 26-45 | 1-2 | 27-29 | 0 | 5-10 | <1.5 |
| 3 | 23-43 | 1-2 | 23-29 | 0 | 5-10 | <1.5 |
| 4 | 22-41 | 1-2 | 15-21 | 0 | 5-10 | <1.5 |
| 5 | 22-41 | 1-2 | 7-13 | 5-11 | 5-10 | <1.5 |
| Examples | Proportion of mineral powder (wt%) | Barium sulfate (wt%) | Calcium carbonate (wt%) | Cerium oxide (wt%) | Density of finished product (g/cm3) | Characteristics of the finished product |
| 1 | 40-60 | 40-60 | 0 | 0 | 2.4-2.8 | Non-electroplatable and too poor toughness |
| 2 | 55-74 | 30-50 | 5-15 | 1-9 | 2.5-2.9 | Can be electroplated with too poor toughness |
| 3 | 57-77 | 30-50 | 5-15 | 1-12 | 2.5-2.9 | Can be electroplated with too poor toughness |
| 4 | 59-78 | 30-50 | 5-15 | 2-13 | 2.6-3.1 | Can be electroplated and has good toughness |
| 5 | 59-78 | 30-50 | 5-15 | 2-13 | 2.5-3.2 | Can be electroplated and has good toughness |
Plastic articles prepared using lead-free copper alloy, zinc alloy and ABS (Acrylonitrile-Butadiene-Styrene copolymer) conventionally used in the art, and the high-density plastic composition of example 5 were compared in terms of specific gravity, lead content, water corrosion resistance, tensile strength at break and texture, and the comparison results are shown in table 2. By comparison of the results, it was demonstrated that the plastic articles made from the high-density plastic composition of the present invention are superior to ABS articles in metallic feeling, specific gravity and toughness (tensile strength at break). Although the appearance of the product made of the electroplatable high-density plastic composition of the invention has a metallic feel inferior to that of a real metal, the characteristics of no lead and the water corrosion resistance are better than those of lead-free copper alloy and zinc alloy.
In summary, the electroplating sacrificial agent (aliphatic polyamide powder) and the coupling agent are added to the electroplatable high-density plastic composition of the present invention, so that the finished product has electroplatable property and mechanical toughness, and the characteristics of the polymer sacrificial agent are matched in the plastic finished product manufacturing process, and the swelling agent is added during the chemical roughening pretreatment to improve the surface activity, thereby improving the adhesion of the subsequent metal electroplating layer. Meanwhile, the inorganic substance (such as mineral powder) is added into the electroplatable high-density plastic composition to ensure that the density of the finished product is between 2.5 and 3.2g/cm 3, thereby increasing the weight and the texture of the product.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (12)
1. An electroplatable high density plastic composition comprising: 22-40wt% of polymer composition, 59-77wt% of mineral powder composition and 0.1-1.5wt% of coupling agent;
wherein the polymer composition comprises: 1-2wt% polyamide 6, 7-21wt% polyamide 66, and 5-10wt% polytetramethylene adipamide;
the mineral powder composition comprises: 30-50wt% of barium sulfate, 5-15wt% of calcium carbonate, and 2-13wt% of cerium dioxide;
the coupling agent is at least one selected from silane coupling agent, titanate coupling agent, aluminate coupling agent and organic chromium complex coupling agent.
2. The high-density plastic composition according to claim 1, wherein the polymer composition further comprises: 5-11wt% of an aromatic polyamide;
wherein the aromatic polyamide is selected from at least one of polyhexamethylene terephthalamide, poly-p-phenylene terephthalamide and poly-1, 9-nonylene terephthalamide.
3. The high density plastic composition of claim 1, wherein the polyamide 66 is present in an amount of 15-21% by weight.
4. The high density plastic composition of claim 1, wherein the polyamide 66 is present in an amount of 7-13% by weight.
5. An electroplatable high density plastic article comprising: a plastic body; the raw material for preparing the plastic body comprises the high-density plastic composition as claimed in any one of claims 1 to 4.
6. A high density plastic article according to claim 5, wherein the surface of the plastic body is coated with a metallic plating.
7. A high density plastic article according to claim 5 or 6, wherein the high density plastic article is used as a sanitary fitting.
8. The high density plastic article of claim 7, wherein the sanitary fitting comprises: one of a faucet body, a shower body and a handle.
9. A method of preparing the platable high density plastic article of any one of claims 5 to 8, comprising:
screening a mineral powder composition with the particle size of 0.1-1.0 mu m, and carrying out surface modification on the mineral powder composition by adopting a coupling agent;
mixing polyamide 6, polyamide 66 and polytetramethylene adipamide, and carrying out vacuum dehydration to prepare a high polymer composition;
mixing the polymer composition and the mineral powder composition subjected to surface modification to obtain a high-density plastic primary finished product;
cutting the high-density plastic primary finished product into particles and drying to obtain the high-density plastic primary finished product with the density of 2.5-3.2g/cm3The high-density plastic of (3);
molding the high-density plastic to obtain a first high-density plastic product;
puffing and coarsening the surface of the first high-density plastic product to obtain a first high-density plastic product subjected to surface treatment;
and performing palladium activation and reduction to form a metal coating on the surface of the first high-density plastic product subjected to surface treatment.
10. The method of claim 9, wherein the coupling agent is applied by coating, spraying or misting the ore fines composition to modify the surface.
11. The method according to claim 9, wherein the mineral powder composition is surface-modified by soaking in the coupling agent.
12. The method of claim 9, wherein the step of forming the metal plating layer on the surface of the surface-treated plastic article comprises: plating a nickel layer on the surface of the plastic product subjected to surface treatment by adopting nickel-phosphorus alloy plating solution without ammonia, wherein the thickness of the nickel layer is 0.3 mu m; then, a pre-plated nickel layer or a pre-plated copper layer with the thickness of 2-5 mu m, a copper acid plating layer with the thickness of 20 mu m, a bright nickel plating layer with the thickness of 12 mu m and a bright chromium plating layer with the thickness of 0.3 mu m are sequentially plated on the surface of the nickel layer, which is far away from the plastic product.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4940608A (en) * | 1988-11-07 | 1990-07-10 | Okuno Chemical Industry Co., Ltd. | Local electroless plating process for plastics |
| CN101921475A (en) * | 2010-09-07 | 2010-12-22 | 厦门建霖工业有限公司 | Metal-like engineering plastic composite material and preparation method thereof |
| CN107663372A (en) * | 2017-09-19 | 2018-02-06 | 江门市德众泰工程塑胶科技有限公司 | A kind of polyamide compound for environment-protection electroplating and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4940608A (en) * | 1988-11-07 | 1990-07-10 | Okuno Chemical Industry Co., Ltd. | Local electroless plating process for plastics |
| CN101921475A (en) * | 2010-09-07 | 2010-12-22 | 厦门建霖工业有限公司 | Metal-like engineering plastic composite material and preparation method thereof |
| CN107663372A (en) * | 2017-09-19 | 2018-02-06 | 江门市德众泰工程塑胶科技有限公司 | A kind of polyamide compound for environment-protection electroplating and preparation method thereof |
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