CN101974218A - Special plastic/acrylonitrile butadiene styrene (PC/ABS) alloy for notebook computer shell - Google Patents
Special plastic/acrylonitrile butadiene styrene (PC/ABS) alloy for notebook computer shell Download PDFInfo
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Abstract
The invention discloses a special plastic/acrylonitrile butadiene styrene (PC/ABS) alloy for a notebook computer shell. The formula comprises the following materials in parts by weight: 30-80 parts of polycarbonate, 5-65 parts of acrylonitrile-butadiene-styrene copolymer, 5-15 parts of compatilizer, 1-15 parts of flame retardant agent, 3-20 parts of filler, 1-10 parts of hardness modifier, 0.5-5 parts of anti-falling agent and 0-1 part of auxiliary agent. By adopting specific high-molecular polymers of polymethyl methacrylate (PMMA), ultrahigh-molecular polysiloxane and the like, the special PC/ABS alloy selects mineral fillers of specific-size mica, glass fiber and the like to carry out rematching therewith and generates synergistic effect, thus obviously improving the surface hardness and scraping resistance of the material and simultaneously having no influence on the other performances of the material. The PC/ABS alloy material has excellent impact resistance, surface scraping resistance and flame retardance, can meet the requirements of plastic for the notebook computer shell and has considerable promotion and application values.
Description
Technical field
The present invention relates to a kind of high polymer alloy, be specifically related to a kind of PC/ABS alloy of notebook computer casing special use.
Background technology
The shell of notebook computer is the most direct mode of protection body, also is the important factor that influences its radiating effect, weight, aesthetics.Because notebook computer has characteristics such as compact construction, movability is strong, environment for use is changeable, therefore require case material to possess physical strength height, scrape resistant, high-low temperature resistant impact excellence, good heat resistance, anti-burning, in light weight and characteristics such as forming process is good, electrodepositable and cost are lower.
Existing commercial notebook computer plastics matter shell uses polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer polymer modifications such as (ABS) more, as glass fibre modification PC, carbon fiber modifying PC, glass fibre modified ABS, glass fibre modification PC/ABS alloy, carbon fiber modifying PC/ABS alloy etc., in these are polymer-modified, add fire retardant usually and satisfy material flame resistant requirement.Though the flame-proofed polymer material with carbon fiber reinforced PC/ABS alloy also has surface hardness and scraping and wiping resistance performance preferably, its cost costliness.Prescription in addition will have preferably, and the method for scraping and wiping resistance performance comprises mineral filler such as glass microballon, the mica etc. that use the raising surface hardness.As publication number is manufacture method and the relevant composition that the Chinese invention patent of CN100516125C discloses the polycarbonate that a kind of fire-retardant glass fills; Publication number is the weather-proof polycarbonate article of the disclosed a kind of high-modulus of the Chinese invention patent of CN100482728C, adopts glass flake or mica to improve surface hardness.Also having publication number is that the Chinese invention patent of CN101096448 discloses a kind of modified formula that improves the high surface hardness PC/ABS resin of hardness by interpolation styrene-acrylonitrile copolymer (SAN).Shortcomings such as that but these products all exist is good inadequately as surperficial scraping and wiping resistance performance, product weight increase, electrodepositable variation.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art, and a kind of PC/ABS alloy of notebook computer casing special use is provided, and this alloy can not damage other performances of material when improving the material surface scraping and wiping resistance performance.
For solving above technical problem, the technical scheme that the present invention takes is:
The special-purpose PC/ABS alloy of a kind of notebook computer casing, by weight raw materials used, filling a prescription is: 30～80 parts of polycarbonate (PC); 5～65 parts of acrylonitrile-butadiene-styrene copolymers (ABS); 5～15 parts of compatilizers; 1～15 part of fire retardant; 3～20 parts of fillers; 1～10 part of hardness properties-correcting agent; 0.5～5 part of Antidrip agent; 0～1 part of auxiliary agent; Described hardness properties-correcting agent is one or more mixture of polymethylmethacrylate (PMMA), polyethylene terephthalate-1,4 cyclohexane dimethanol ester (PETG), styrene-acrylonitrile copolymer (SAN), polysiloxane; Described filler be particle diameter the mineral substance powder between 500 orders～5000 orders or diameter between 5 microns～25 microns mineral fibre or the mixture of the two; The weight ratio of described polycarbonate and acrylonitrile-butadiene-styrene copolymer is between 1.8:1～3:1.
Preferably, the PC/ABS alloy of notebook computer casing special use of the present invention, by weight raw materials used, filling a prescription is: 45～70 parts of polycarbonate; 10～25 parts of acrylonitrile-butadiene-styrene copolymers; 5～10 parts of compatilizers; 10～15 parts of fire retardants; 5～15 parts of fillers; 5～10 parts of hardness properties-correcting agent; 0.5～2 part of Antidrip agent; 0.1～0.5 part of auxiliary agent.
According to the present invention, described polycarbonate can be the polycarbonate resin of choosing wantonly, but is preferably the polycarbonate pellet of number-average molecular weight 24000～30000, perhaps the polycarbonate powder of number-average molecular weight 30000～35000, perhaps the two compound; Described acrylonitrile-butadiene-styrene copolymer is selected from the ABS resin of substance law or emulsion method production, is preferably emulsion method production ABS resin.
Normally, along with the increase of ABS component, the workability of alloy, paintability etc. improve in the PC/ABS alloy, but the thermotolerance of alloy, impact resistance can be affected.Therefore in order to obtain to have the PC/ABS alloy of good over-all properties, suitable PC and ABS weight proportion are necessary.
According to the present invention, described compatilizer can be selected from butadiene-acrylic acid butyl ester-methyl methacrylate-grafted polymkeric substance, the maleic anhydride graft acrylonitrile-butadiene-styrene copolymer, acrylic acid-grafted acrylonitrile-butadiene-styrene copolymer, methacrylic acid graft phenylethene-acrylonitrile copolymer, maleic anhydride grafted polyethylene, styrene acrylonitrile copolymer (SAN), the amination styrene acrylonitrile copolymer, methyl methacrylate-butadiene-styrene block copolymer (MBS), the mixture of one or more in vinylbenzene-hydrogenation butadiene-styrene block copolymer (SEBS) etc.; But preferred compatilizer is one or more the mixture in maleic anhydride graft acrylonitrile-butadiene-styrene copolymer, acrylic acid-grafted acrylonitrile-butadiene-styrene copolymer, the methacrylic acid graft phenylethene-acrylonitrile copolymer.
Described fire retardant can be selected one or more the mixture in phosphate compounds, phosphonate ester compound, silicon compound, fluorochemicals, sulfonate and the borate for use; But preferred fire retardant is a kind of in phosphate compounds and the fluorochemicals or the mixture of the two.
The researchist finds that select for use some polymkeric substance with high surface hardness composite as hardness properties-correcting agent and inorganic mineral filler, there is synergistic effect in the two, can obviously improve the surface hardness and the scraping and wiping resistance performance of PC/ABS flame-retardant alloy.
According to the present invention, described mineral substance powder is preferably one or more the mixture in the glass microballon of particle diameter between 3000 orders～5000 orders, lime carbonate, mica, talcum powder, wollastonite, silicon oxide, carbon black, graphite, the diatomite, and described mineral fibre is preferably one or more mixture of the glass fibre of diameter between 5 microns～15 microns, carbon fiber, boron fibre.Further, described mineral substance powder preferably is selected from glass microballon or sheet mica, and described mineral fibre preferably is selected from glass fibre or carbon fiber.
Described hardness properties-correcting agent is preferably one or both mixture of polymethylmethacrylate (PMMA) and polysiloxane, described polysiloxane is preferably the ultra-high molecular weight polysiloxane, and described ultra-high molecular weight polysiloxane can be selected from the TEGOMER H-Si 6440P of EVONIK company.
Described Antidrip agent is at least a fluorochemicals, is preferably tetrafluoroethylene.
PC/ABS alloy formula of the present invention also contains optional processing stabilization aid well known in the art, comprises one or more the mixture in antioxidant, photostabilizer, the UV light absorber.Described antioxidant can be selected from phosphite ester compound or hindered phenol compound or the like, as β-(3,5-di-t-butyl-4-phenyl) propionic acid octadecanol ester.
The special-purpose PC/ABS alloy of notebook computer casing of the present invention can use any known plastic working method preparation, as by processing such as forcing machine, mixing machine, kneaders, can be periodical operation, also can be operate continuously.But recommend to use the twin screw extruder melt-blending process to prepare PC/ABS alloy of the present invention, to obtain best effect.
Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage:
PC/ABS alloy of the present invention, by adjusting the prescription of each component, specific high molecular polymers such as employing PMMA are as hardness properties-correcting agent, select for use specific mineral substance powder or mineral fibre etc. to carry out composite with it and act synergistically, when improving material surface hardness and scraping and wiping resistance performance, can not influence other performances of material again; PC/ABS alloy material of the present invention has excellent in impact resistance, and surperficial scratch resistance and flame retardant resistance can satisfy the requirement of notebook computer casing with plastics, have suitable application value.
Embodiment
The present invention will be further described in detail below in conjunction with specific embodiment, but be not limited to these embodiment.
The prepared halogen-free flame retardant PC of the present invention/ABS alloy material adopts following method or standard to carry out performance test, and all test bars need be deposited under humidity 50% ± 5% condition and be not less than 16 hours in temperature 23 ℃ ± 2:
Tensile strength: test according to standard A STM D638;
Modulus in flexure: test according to standard A STM D790;
Notched Izod impact strength: test according to standard A STM D256;
Heat-drawn wire: test test condition 1.82MPa, 3.2mm/min according to standard A STM D648.
Flame retardant resistance: test the thick 1.2mm of batten according to standard UL 94.
Pencil hardness: test test condition 500g according to standard A STM D785.
Each embodiment adopts the method that is prepared as follows:
According to parts by weight, with ABS resin dry 12h under 80 ℃ of conditions; With PC dry 10h under 100 ℃ of conditions; Above dried material is melt extruded granulation with joining after additives such as compatilizer, fire retardant, hardness properties-correcting agent, anti-dripping agent, filler, antioxidant and photostabilizer mix in the twin screw extruder in high-speed mixer, obtain product.The extrusion temperature of used twin screw extruder is 205 ℃～270 ℃, and rotating speed is 500 rev/mins, and the residence time of material in twin screw extruder is 1～3 minute.
The prescription of each embodiment is shown in table 1;
The performance of the obtained PC/ABS alloy product of each embodiment is shown in table 2;
Each Example formulations of table 1
| Prescription | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| PC | 45 | 44 | 45 | 44 | 44 | 44 |
| ABS | 19 | 18 | 19 | 18 | 22 | 22 |
| Compatilizer | 8 | 8 | 8 | 8 | 9 | 9 |
| Fire retardant | 12 | 12 | 12 | 12 | 12 | 12 |
| Anti-dripping agent | 1 | 1 | 1 | 1 | 1 | 1 |
| PMMA | 5 | 7 | ? | ? | 7 | ? |
| 6440P | ? | ? | 5 | 7 | ? | 7 |
| Mica | 10 | ? | 10 | ? | ? | ? |
| Glass fibre | ? | 10 | ? | 10 | 5 | 5 |
| Other auxiliary agents | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
The performance comparison of each embodiment gained PC/ABS alloy of table 2
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Tensile strength (MPa) | 55 | 56 | 56 | 54 | 53 | 53 |
| Modulus in flexure (Mpa) | 4520 | 4550 | 4550 | 4320 | 4310 | 4330 |
| Notched Izod impact strength (kJ/m 2） | 9 | 9 | 7.8 | 8.5 | 7.9 | 8.2 |
| Heat-drawn wire (℃), 1.82MPa | 87 | 90 | 89 | 89 | 86 | 86 |
| Incendivity, 1.2mm | V-0 | V-0 | V-0 | V-0 | V-0 | V-0 |
| Pencil hardness (R) | HB-H | 1H | 1H | 1H | HB-H | 1H |
More than the present invention has been done detailed description; its purpose is to allow the personage that is familiar with this art can understand content of the present invention and is implemented; can not limit protection scope of the present invention with this; all equivalences of doing according to spirit of the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (10)
1. the special-purpose PC/ABS alloy of a notebook computer casing, it is characterized in that: in weight part, described PC/ABS alloy materials prescription is: 30～80 parts of polycarbonate; 5～65 parts of acrylonitrile-butadiene-styrene copolymers; 5～15 parts of compatilizers; 1～15 part of fire retardant; 3～20 parts of fillers; 1～10 part of hardness properties-correcting agent; 0.5～5 part of Antidrip agent; 0～1 part of auxiliary agent; Described hardness properties-correcting agent is one or more the mixture in polymethylmethacrylate, polyethylene terephthalate-1,4 cyclohexane dimethanol ester, styrene-acrylonitrile copolymer and the polysiloxane; Described filler be particle diameter the mineral substance powder between 500 orders～5000 orders or diameter between 5 microns～25 microns mineral fibre or the mixture of the two; The weight ratio of described polycarbonate and acrylonitrile-butadiene-styrene copolymer is between 1.8:1～3:1.
2. PC/ABS alloy according to claim 1 is characterized in that: described PC/ABS alloy materials prescription is: 45～70 parts of polycarbonate; 10～25 parts of acrylonitrile-butadiene-styrene copolymers; 5～10 parts of compatilizers; 10～15 parts of fire retardants; 5～15 parts of fillers; 5～10 parts of hardness properties-correcting agent; 0.5～2 part of Antidrip agent; 0.1～0.5 part of auxiliary agent.
3. PC/ABS alloy according to claim 1 and 2 is characterized in that: described compatilizer is butadiene-acrylic acid butyl ester-methyl methacrylate-grafted polymkeric substance, the maleic anhydride graft acrylonitrile-butadiene-styrene copolymer, acrylic acid-grafted acrylonitrile-butadiene-styrene copolymer, methacrylic acid graft phenylethene-acrylonitrile copolymer, maleic anhydride grafted polyethylene, the amination styrene acrylonitrile copolymer, styrene acrylonitrile copolymer, the mixture of one or more in methyl methacrylate-butadiene-styrene block copolymer and vinylbenzene-hydrogenation butadiene-styrene block copolymer.
4. PC/ABS alloy according to claim 3 is characterized in that: described compatilizer is one or more the mixture in maleic anhydride graft acrylonitrile-butadiene-styrene copolymer, acrylic acid-grafted acrylonitrile-butadiene-styrene copolymer, the methacrylic acid graft phenylethene-acrylonitrile copolymer.
5. PC/ABS alloy according to claim 1 and 2 is characterized in that: described fire retardant is one or more the mixture in phosphate compounds, phosphonate ester compound, silicon compound, fluorochemicals, sulfonate and the borate.
6. PC/ABS alloy according to claim 1 and 2, it is characterized in that: described mineral substance powder is one or more the mixture in the glass microballon of particle diameter between 3000 orders～5000 orders, lime carbonate, mica, talcum powder, wollastonite, silicon oxide, carbon black, graphite, the diatomite, and described mineral fibre is one or more a mixture of the glass fibre of diameter between 5 microns～15 microns, carbon fiber, boron fibre.
7. PC/ABS alloy according to claim 6 is characterized in that: described mineral substance powder is glass microballon or sheet mica, and described mineral fibre is glass fibre or carbon fiber.
8. PC/ABS alloy according to claim 1 and 2 is characterized in that: described hardness properties-correcting agent is polymethylmethacrylate, polysiloxane or the mixture of the two.
9. PC/ABS alloy according to claim 1 and 2 is characterized in that: described Antidrip agent is a tetrafluoroethylene.
10. PC/ABS alloy according to claim 1 and 2 is characterized in that: described auxiliary agent is one or more the mixture that is selected from antioxidant, photostabilizer and the UV light absorber.
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