CN102827459B - A kind of plastics and preparation method thereof and a kind of electronic product casing - Google Patents
A kind of plastics and preparation method thereof and a kind of electronic product casing Download PDFInfo
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Abstract
The invention provides a kind of plastics, the matrix resin of described plastics is PETG, with the weight of matrix resin PETG for benchmark, the weight percent of other each components is: flake aluminum 0.5%-2%, granular aluminum powder 2.5%-6%, coupling agent 0.06%-0.3%, hyper-dispersant 0.5wt%-3wt%, and the weight ratio of granular aluminum powder and flake aluminum is (3-5): 1.Present invention also offers the preparation method of this plastics.Plastics provided by the invention have metal effect and pearl effect concurrently, and it is less to realize molded surface defects of products.
Description
Technical field
The invention belongs to polymeric material field, particularly relate to a kind of plastics that can be used for electronic product casing and preparation method thereof.
Background technology
Surface decoration tech is widely used in the electronic products such as mobile phone, and its abundant vision and sensory effects have become the focus that human consumer pays close attention to.Plastic-metal effect enjoys favor because it combines the bright and lustrous feature of light weight, easily processing and the metal of plastics.The traditional technology of metal current effect plastic exploitation is generally surface spraying, plating, PVD(PVD be English Physical Vapor Deposition(physical vapor deposition) abbreviation, the technology be known to the skilled person).But these traditional technologys in process of production solvent, waste water cause severe contamination to environment, and not environmentally, energy consumption is large; Percent defective is high, waste recovery complex process, and cost is high and can not thoroughly clean clean, causes product material capability to decline, can not recycle.
At present, the method of the existing metal effect of direct molded shape is shown up prominently, but choose that difficulty is large, complete processing is complicated, the restriction of moulding structure due to base material and metal powder, technique is mainly limited to the molded of the large part plastic front board such as automobile, household electrical appliances.
Summary of the invention
Being difficult to realize taking into account metal and pearl effect, be difficult to realize the less problem of molded surface defects of products for solving phone housing injection plastics in prior art, the invention provides a kind of plastics and preparation method thereof and a kind of electronic product casing.
A kind of plastics, the matrix resin of described plastics is polyethylene terephthalate-1,4-cyclohexanedimethanoester ester (PETG), with the weight of matrix resin PETG for benchmark, the weight percent of other each components is: flake aluminum 0.5%-2%, granular aluminum powder 2.5%-6%, coupling agent 0.06%-0.3%, hyper-dispersant 0.5wt %-3wt %, and the weight ratio of granular aluminum powder and flake aluminum is (3-5): 1.
A kind of preparation method of plastics, it comprises the following steps: 1) flake aluminum and granular aluminum powder pre-treatment: coupling agent is joined in etoh solvent the ethanolic soln obtained containing coupling agent, two parts are divided by this solution, flake aluminum, granular aluminum powder are joined respectively in above-mentioned two parts of solution again and stir, solvent evaporated ethanol, obtain flake aluminum II and granular aluminum powder II, flake aluminum II and granular aluminum powder II are placed in vacuum drying oven respectively and toast, obtain flake aluminum III and granular aluminum powder III; 2) PETG baking: PETG is placed in moisture eliminating drying box baking processing, obtains PETG II; 3) raw material mixing: by through step 1) and 2) process the flake aluminum III, granular aluminum powder III, PETG II and the hyper-dispersant that obtain and join in high speed mixer and be mixed to get batch mixing; 4) blending extrusion: batch mixing step 3) obtained joins blending extrusion in twin screw extruder, tie rod pelletizing, obtains plastics.
A kind of electronic product casing, the material of described electronic product casing is plastics provided by the present invention.Plastics of the present invention, have metal effect and pearl effect concurrently, surface defects of products is less.
Embodiment
A kind of plastics, the matrix resin of described plastics is PETG, with the weight of matrix resin PETG for benchmark, the weight percent of other each components is: flake aluminum 0.5%-2%, granular aluminum powder 2.5%-6%, coupling agent 0.06%-0.3%, hyper-dispersant 0.5wt%-3wt%, and the weight ratio of granular aluminum powder and flake aluminum is (3-5): 1.The present inventor is found by a large amount of experiments, when the weight of granular aluminum powder and flake aluminum is only within the scope of aforementioned proportion, pearl effect and metal effect are all good, and flake aluminum is crossed and can be caused product defects at most, and granular aluminum powder is crossed pearl effect at most and is just difficult to realize well.
According to the present invention, described PETG refers to polyethylene terephthalate-1,4 cyclohexane dimethanol ester, and its good fluidity, as base material.PETG is the novel copolymerized ester formed by Isosorbide-5-Nitrae-cyclohexanedimethanol (CHDM) modification polyethylene terephthalate (PET), and full name is polyethylene terephthalate-1,4 cyclohexane dimethanol ester.It is a kind of unbodied transparent copolyester, and PETG has high transmission rate and mobility, excellent glossiness, chemical resistant properties and formability etc.PETG material due to the different Tg of CHDM content be 70 DEG C ~ 120 DEG C, its shock resistance is better than common polycarbonate (PC), more cheap than PC, its toughness is that (chemical name is polymethylmethacrylate to acrylic, the technical term of chemistry be known to the skilled person.) 15 ~ 20 times, be the 5-10 of modification acrylic doubly.PETG highly transparent, excellent shock resistance, suitable especially shaping heavy wall transparent article, its machine-shaping property is splendid, the design of arbitrary shape can be carried out according to the intention of planner, can adopt traditional to extrude, injection moulding, the forming method such as blowing and plastic uptake, can be widely used in sheet material, sheet material, high-performance shrink film, bottle with and the market such as profiled material, its suitability for secondary processing is excellent simultaneously, can carry out conventional machining modification.PETG of the present invention can be directly commercially available, the Tritan TX1001 of such as U.S. Yi Shi Man, the PETG product of SK company of Korea S.
According to the present invention, described granular aluminum powder particle diameter is preferably 10-100um, and described flake aluminum particle diameter is preferably 100-400um.The present inventor by great many of experiments, is surprised to find that, when granular aluminum powder particle diameter and flake aluminum meet above-mentioned scope, obtained plastic prod pearl effect and metal effect all good.If flake aluminum particle diameter < is 100um, pearl effect is then not obvious; If flake aluminum particle diameter > is 400um, because the inertia of aluminium powder increases, by uneven for generation dispersion and poor fluidity problem, finally cause portioned product surface imperfection.Flake aluminum of the present invention can directly by commercially available, the FAlN250 of such as Jiaozuo Banlv Nano Material Engineering Co., Ltd., FAlN80, FAlN350, FAlN160, FA1N400, FAlN300, FA1N450 product.Granular aluminum powder of the present invention can directly by commercially available, the such as FLQG0# of ocean, Henan Aluminum company limited, FLQG1#, FLQG2#, FLQG3#, FLQG4# product.
According to the present invention, also containing oxidation inhibitor in described plastics, with the weight of matrix resin PETG for benchmark, described oxidation inhibitor 0.3wt%-0.6wt%.
According to the present invention, described oxidation inhibitor is selected from butylated hydroxy anisole, butylated hydroxytoluene, tertiarybutylhydroquinone, phosphorous acid benzene two isodecyl ester, pentaerythritol bis-phosphite, [3-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, tricresyl phosphite (2, 4-di-tert-butyl-phenyl) ester, [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] ten caprylates, four [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] one or more in pentaerythritol ester, described oxidation inhibitor is the antioxidant that those skilled in the art commonly use, can directly by commercially available, such as well known to a person skilled in the art antioxidant 1010 (trade(brand)name: EVERNOX-10).Oxidation inhibitor of the present invention can prevent PETG from degrading in the course of processing and widening the processing temperature of material.
According to the present invention, described hyper-dispersant is selected from polyester type ultra-dispersant agent, polyether-type hyper-dispersant, polyacrylate hyper-dispersant, one or more in polyolefins hyper-dispersant, for the hyper-dispersant that those skilled in the art commonly use, can directly by commercially available, the such as SOLSPERSE-3000 of Britain ICI company,-6000,-9000,-13240,-17000,-22000, the L4707 of KVK company of Denmark, L4708, L4744, D4963, P4981, PD-5, DA-50, WH-1, WBZ-3, the ICI company of SOLSPERSE 3000(Britain of Germany Lu Borun (Yuan Nuoyu company), KVK company of Denmark and German Lu Borun (Yuan Nuoyu company) are Babcock and Wilcox well known to those skilled in the art).Hyper-dispersant of the present invention can make flake aluminum and granular aluminum powder be dispersed in PETG base material, reduces product defects.
According to the present invention, described coupling agent is a kind of tensio-active agent, silane coupling agent can be selected from, aluminate coupling agent, titanate coupling agent, one or both in boric acid ester coupler, for the coupling agent that those skilled in the art commonly use, can directly by commercially available, the domestic corresponding trade mark KH560 of the such as KBM-403(of Japanese SHIN-ETSU HANTOTAI), the domestic corresponding trade mark KH570 of KBM-503(), the domestic corresponding trade mark KH550 of KBM-903(), KBM-13, the Z-6040 of Dow corning (Dow corning), the domestic corresponding trade mark KH570 of Z-6030(), Z-6020, the domestic corresponding trade mark KH550 of Z-6011() etc. product.Coupling agent of the present invention can make aluminium powder and PETG bonding well, not easily peels off.
Present invention also offers the preparation method of above-mentioned electronic product casing injection plastics, it comprises the following steps: 1) flake aluminum and granular aluminum powder pre-treatment: coupling agent is joined in etoh solvent the ethanolic soln obtained containing coupling agent, two parts are divided by this solution, flake aluminum, granular aluminum powder are joined respectively above-mentioned two parts to stir containing in the ethanolic soln of coupling agent, evaporate to dryness ethanol obtains flake aluminum II and granular aluminum powder II, flake aluminum II and granular aluminum powder II is placed in respectively vacuum drying oven baking and obtains pretreated flake aluminum III and granular aluminum powder III; 2) PETG baking: PETG is placed in moisture eliminating drying box baking processing, obtains PETG II; 3) raw material mixing: join in high speed mixer be mixed to get batch mixing by 1. and 2. processing the flake aluminum III, granular aluminum powder III, PETG II and the hyper-dispersant that obtain through step; 4) blending extrusion: batch mixing step 3) obtained joins blending extrusion in twin screw extruder, then the speed controlling dicing machine is that 300rad/min carries out tie rod pelletizing, obtains plastics.
According to preparation method of the present invention, in described step 1), the flake aluminum II obtained and granular aluminum powder II are placed in respectively vacuum drying oven when toasting, control storing temperature 80-100 DEG C, baking time 4-6h.
According to preparation method of the present invention, described step 2) in when PETG being placed in moisture eliminating drying box baking processing, control storing temperature 80-90 DEG C, baking time 4-8h, to ensure that its water content is lower than 0.02%.
A kind of solvent used when coupling agent treatment aluminium powder made by ethanol of the present invention, object makes coupling agent dispersed and is attached on aluminium powder, and after processing aluminium powder, ethanol is by evaporate to dryness.With the weight of matrix resin PETG for benchmark, ethanol accounts for 20 wt%-60 wt%.
Present invention also offers a kind of electronic product casing, the material of described electronic product casing is plastics provided by the present invention.This material is by above-mentioned steps 4) plastic warp of process gained moldedly obtains, concrete steps can be: the plastics of step 4) process gained to be placed in moisture eliminating drying box 88 DEG C of bakings 4 hours, carry out standard batten injection moulding (injection molding machine is Sumitomo SE180DU, and most high injection speed is 800mm/s) again.
The preparation method of electronic product casing injection plastics provided by the present invention can specifically describe and be: 1) flake aluminum and granular aluminum powder pre-treatment: by silane coupling agent KH560(metal powder equivalent 3%) to add a certain amount of concentration be in the ethanol of 95%, stir 30min, make it be uniformly dispersed, again by load weighted flake aluminum, granular aluminum powder joins respectively and stirs 2H above-mentioned containing in the ethanolic soln of coupling agent, coupling agent is fully acted on, then evaporate to dryness ethanol, the flake aluminum II obtained and granular aluminum powder II are placed in vacuum drying oven respectively, at 100 DEG C, toast 4H obtain pretreated flake aluminum III and granular aluminum powder III (metal powder of the present invention comprises flake aluminum and granular aluminum powder), 2) PETG raw material baking: PETG is placed in moisture eliminating drying box 88 DEG C baking 4 hours, to ensure that its water content is lower than 0.02%, obtains PETG II, 3) raw material mixing: flake aluminum III, granular aluminum powder III, PETG II, hyper-dispersant are added in high speed mixer by a certain percentage with other processing aid (as oxidation inhibitor) and mixes 3 minutes, material is mixed to obtain batch mixing, 4) blending extrusion: the batch mixing obtained in step 3) is added in twin screw extruder and extrudes, then the speed controlling dicing machine is that 300rad/min carries out tie rod pelletizing, obtain plastics (forcing machine parameter is:
| One district | 2nd district | 3rd district | 4th district | 5th district | 6th district | 7th district | 8th district | 9th district | Tenth district |
| 200℃ | 230℃ | 240℃ | 250℃ | 260℃ | 260℃ | 275℃ | 275℃ | 275℃ | 275℃ |
Forcing machine specification is: the twin screw extruder that Nanjing New Time Co. produces, and length-to-diameter ratio is 25, screw speed: 180rad/min feeding: 13rad/min).
Below in conjunction with specific embodiment, the present invention is described in detail, and following examples, only for explaining the present invention, are not used in restriction the present invention.
The each component parameter of table 1: embodiment 1-3 and correlation step parameter
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | |
| PETG/g | 100 | 100 | 100 | 100 |
| Flake aluminum/g | 0.5 | 0.5 | 1 | 2 |
| Granular aluminum powder/g | 2.5 | 2.5 | 4 | 6 |
| Coupling agent/g | 0.1 | 0.1 | 0.06 | 0.3 |
| Hyper-dispersant/g | 0.5 | 0.5 | 2 | 3 |
| Oxidation inhibitor/g | / | 0.3 | 0.6 | 0.4 |
| Temperature when baking flake aluminum II and granular aluminum powder II, time | 90℃、5h | 90℃、5h | 100℃、4h | 90℃、4h |
| Temperature during baking PETG, time | 80℃、8h | 80℃、8h | 85℃、6h | 90℃、4h |
| Injection moulding speed/(mm/s) | 600 | 600 | 800 | 400 |
[embodiment 1]
1) flake aluminum and granular aluminum powder pre-treatment: 0.1g coupling agent (silane coupling agent KH560) is added in 20g ethanol (concentration is 95%), stir 30min, make it be uniformly dispersed, again by the 0.5g flake aluminum (FAlN350 of Jiaozuo Banlv Nano Material Engineering Co., Ltd., particle diameter 400um), 2.5g granular aluminum powder (the FLQG2# of ocean, Henan Aluminum company limited, particle diameter 18um) join respectively and stir 2H above-mentioned containing in the ethanolic soln of coupling agent, coupling agent is fully acted on, then evaporate to dryness ethanol, the flake aluminum II obtained and granular aluminum powder II are placed in vacuum drying oven respectively, toast 5h at 90 DEG C and obtain pretreated flake aluminum III and granular aluminum powder III,
2) PETG raw material baking: the Tritan TX1001 by Yi Shi Man of the 100gPETG(U.S.) be placed in moisture eliminating drying box and toast, obtain PETG II;
3) raw material mixing: flake aluminum III, granular aluminum powder III, PETG II and 0.5g hyper-dispersant (SOLSPERSE 3000 of German Lu Borun) are added in high speed mixer and mix 3 minutes, mix to obtain batch mixing;
4) blending extrusion: the batch mixing obtained in step 3) is added in twin screw extruder and extrudes, then the speed controlling dicing machine is that 300rad/min carries out tie rod pelletizing, obtain plastics (forcing machine parameter is as follows:
| One district | 2nd district | 3rd district | 4th district | 5th district | 6th district | 7th district | 8th district | 9th district | Tenth district |
| 200℃ | 230℃ | 240℃ | 250℃ | 260℃ | 260℃ | 275℃ | 275℃ | 275℃ | 275℃ |
Forcing machine specification is: the twin screw extruder that Nanjing New Time Co. produces, and length-to-diameter ratio is 25, screw speed: 180rad/min feeding: 13rad/min);
5) molded: 88 DEG C of bakings 4 hours will to be placed in moisture eliminating drying box through step 4) process gained pellet, control injection moulding speed again to carry out the injection moulding of standard batten (injection molding machine is Sumitomo SE180DU, most high injection speed is 800mm/s), obtain electronic product casing S1.
Table 2: injection parameters (clamp force 800KN)
| Board specification | High-speed injection molding machine | Injection speed mm/s | 600 |
| Storing temperature/DEG C | 88 | Injection pressure kgf/c | 2600 |
| Baking time/h | 4 | Dwell pressure kgf/c | 1400 |
| Melt temperature/DEG C | 282 | Dwell time sec | 1.5 |
| Die temperature/DEG C | 60 | Cooling time sec | 18 |
| Hot runner temperature/DEG C | 285 | Cycle time sec | 33.7 |
[embodiment 2] also adds 0.3g oxidation inhibitor (antioxidant 1010, trade(brand)name: EVERNOX-10) when embodiment 1 step 3) raw material mixes, and other concrete steps, selection and component concentration are all identical with embodiment 1, obtain electronic product casing S2.
[embodiment 3] changes the correlation parameter different with embodiment 2 by table 1, and other concrete steps and selection are all identical with embodiment 2, obtain product S3.
[embodiment 4] changes the correlation parameter different with embodiment 2 by table 1, and other concrete steps and selection are all identical with embodiment 2, obtain electronic product casing S4.
Different with embodiment 2 in the selection of [embodiment 5] only flake aluminum and granular aluminum powder, adopt the flake aluminum (FAlN80 of Jiaozuo Banlv Nano Material Engineering Co., Ltd., particle diameter 100um) and the granular aluminum powder (FLQG3# of ocean, Henan Aluminum company limited, particle diameter 10um), other are all identical with embodiment 2, obtain electronic product casing S5.
Different with embodiment 2 in the selection of [embodiment 6] only flake aluminum and granular aluminum powder, adopt the flake aluminum (FAlN250 of Jiaozuo Banlv Nano Material Engineering Co., Ltd., particle diameter 250um) and the granular aluminum powder (FLQG0# of ocean, Henan Aluminum company limited, particle diameter 100um), other are all identical with embodiment 2, obtain electronic product casing S6.
Different with embodiment 2 in the selection of [embodiment 7] only flake aluminum and granular aluminum powder, adopt the flake aluminum (FA1N450 of Jiaozuo Banlv Nano Material Engineering Co., Ltd., particle diameter 450um) and the granular aluminum powder (FLQG4# of ocean, Henan Aluminum company limited, particle diameter 6um), other are all identical with embodiment 2, obtain electronic product casing S7.
Flake aluminum mica titanium perlatolic powder (Iriodin 183 of Merck KGaA company, particle diameter 200um) replaces by [comparative example 1], and PETG material replaces (Sabic company PC1132T) by conventional engineering plastic PC, and other are all identical with embodiment 2,
Obtain electronic product casing DS1.
Table 3: product performance test and result
| Project | Testing standard | S1 | S2 | S 3 | S4 | S5 | S6 | S7 | DS1 |
| Notch shock (23 DEG C, J/m) | ASTM D256 | 803 | 973 | 865 | 823 | 882 | 853 | 836 | 828 |
| Tensile strength (Mpa) | ASTM D638 | 47 | 51 | 51 | 49 | 50 | 53 | 51 | 49 |
| Tensile modulus (Mpa) | ASTM D638 | 1540 | 1562 | 1552 | 1536 | 1560 | 1568 | 1552 | 1547 |
| Flexural strength (Mpa) | ASTM D790 | 59 | 61 | 60 | 58 | 67 | 65 | 63 | 59 |
| Modulus in flexure (Mpa) | ASTM D790 | 1560 | 1562 | 1561 | 1564 | 1620 | 1570 | 1573 | 1568 |
| Elongation at break (%) | ASTM D638 | 163 | 171 | 184 | 176 | 180 | 188 | 172 | 169 |
| HDT(0.455Mpa，℃) | ASTM D648 | 92 | 98 | 94 | 95 | 92 | 94 | 94 | 95 |
According to table 3, product surface is dim, refer to that product has metal effect and pearl effect, but metal effect is not obvious; Well, refer to that product surface has obvious pearl effect and metal effect, and product is apparent without any defect; Slight current mark, refers to that product has metal effect and pearl effect, and metal effect is good, but there is lighter melt current mark on surface, and this current mark is general comparatively dark, needs careful inspection just can be found; Pearl effect is not obvious, and refer to that product has pearl effect and metal effect, only pearl effect is not obvious, more trends towards metal effect; Current mark, refers to that product has pearl effect and metal effect, and pearl effect is better, but product has the vestige that visual visible plastic cement melt flows through; Light bond line, refers to that product has pearl effect and metal effect, and pearly-lustre metal effect is better, and product surface, without current mark, only has near sight when being partly with hole or baroque exemplar just can see very dark joint line; Serious current mark joint line, refers to that product surface does not have metallic bead light effect concurrently, and product defects is serious, and current mark joint line is obvious, easily sees obvious stria when observing part hole with holes or baroque exemplar.
As can be seen from table 3 test result, comprehensive mechanical performance and thermal characteristics, generally speaking S1-S7 is with pearl effect and metal effect, and just pearl effect is different with metal effect obvious degree.S2, S3 over-all properties is more close, and surface is zero defect all, with pearly-lustre and metal effect; S4 is due to the addition arrival threshold value of aluminium powder, and have good metallic bead light effect though injection-molded finished, slight current mark has appearred in surface; S5 due to granular aluminum powder particle diameter used and flake aluminum particle diameter more close, so pearl effect is not fairly obvious; S6 due to granular aluminum powder particle diameter little, and flake aluminum particle diameter is large, although so have pearl effect and metal effect, product surface has little defect; S7 is due to selected aluminium powder particle size range preferable range slightly partially, although so product has pearl effect and metal effect concurrently, product expression is light bond line, but substantially without obvious current mark, does not affect overall product effect; S1 is owing to lacking antioxidant, and the mechanical property of materials is relatively poor, and easily cause backlight dim due to material possibility xanthochromia thus cause pearl effect and metal effect not fairly obvious, product exists minor defects.DS1 material due to mobility is lower and with the matching problem of mica titanium, cause product defects, metal cannot be realized simultaneously and to hold concurrently pearl effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. plastics, it is characterized in that, the matrix resin of described plastics is PETG, with the weight of matrix resin PETG for benchmark, the weight percent of other each components is: flake aluminum 0.5%-2%, granular aluminum powder 2.5%-6%, coupling agent 0.06%-0.3%, hyper-dispersant 0.5wt%-3wt%, and the weight ratio of granular aluminum powder and flake aluminum is (3-5): 1; Described granular aluminum powder particle diameter 10-100um, described flake aluminum particle diameter 100-400um.
2. plastics according to claim 1, is characterized in that, also containing oxidation inhibitor in described plastics, with the weight of matrix resin PETG for benchmark, and described oxidation inhibitor 0.3wt%-0.6wt%.
3. plastics according to claim 2, it is characterized in that, described oxidation inhibitor is selected from butylated hydroxy anisole, butylated hydroxytoluene, tertiarybutylhydroquinone, phosphorous acid benzene two isodecyl ester, pentaerythritol bis-phosphite, [3-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, tricresyl phosphite (2, 4-di-tert-butyl-phenyl) ester, [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] ten caprylates, four [β-(3, 5-di-tert-butyl-hydroxy phenyl) propionic acid] one or more in pentaerythritol ester.
4. plastics according to claim 1, is characterized in that, described hyper-dispersant is selected from one or more in polyester type ultra-dispersant agent, polyether-type hyper-dispersant, polyacrylate hyper-dispersant, polyolefins hyper-dispersant.
5. plastics according to claim 1, is characterized in that, described coupling agent be selected from silane coupling agent, aluminate coupling agent, titanate coupling agent, boric acid ester coupler one or both.
6. the preparation method of the plastics according to claim 1-5 any one, it is characterized in that, comprise the following steps: 1) flake aluminum and granular aluminum powder pre-treatment: coupling agent is joined in etoh solvent the ethanolic soln obtained containing coupling agent, two parts are divided by this solution, flake aluminum, granular aluminum powder are joined respectively in above-mentioned two parts of solution again and stir, solvent evaporated ethanol, obtain flake aluminum II and granular aluminum powder II, again flake aluminum II and granular aluminum powder II are placed in vacuum drying oven respectively to toast, obtain flake aluminum III and granular aluminum powder III; 2) PETG pre-treatment: PETG is placed in moisture eliminating drying box baking processing, obtains PETG II; 3) raw material mixing: by through step 1) and 2) the process flake aluminum III, granular aluminum powder III, PETG II and the hyper-dispersant that obtain join in high speed mixer and be mixed to get batch mixing; 4) blending extrusion: by step 3) batch mixing that obtains joins blending extrusion in twin screw extruder, and tie rod pelletizing, obtains plastics.
7. preparation method according to claim 6, is characterized in that, described step 1) in, the flake aluminum II obtained and granular aluminum powder II are placed in respectively vacuum drying oven when toasting, control storing temperature 80-100 DEG C, baking time 4-6h.
8. preparation method according to claim 6, is characterized in that, described step 2) in, when PETG being placed in moisture eliminating drying box baking processing, control storing temperature 80-90 DEG C, baking time 4-8h, to ensure that its water content is lower than 0.02%.
9. an electronic product casing, the material of described electronic product casing is the plastics described in claim 1-5 any one.
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| CN101710518A (en) * | 2009-12-21 | 2010-05-19 | 上海爱普生磁性器件有限公司 | Boned neodymium iron boron permanent magnet and manufacturing method thereof |
| CN101775178A (en) * | 2010-01-20 | 2010-07-14 | 国家复合改性聚合物材料工程技术研究中心 | Formula of plastic material with metallic luster and preparation method thereof |
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| CN102827459A (en) | 2012-12-19 |
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