CN210283462U - Composite plastic shell and composite plastic mobile phone shell - Google Patents
Composite plastic shell and composite plastic mobile phone shell Download PDFInfo
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- CN210283462U CN210283462U CN201920309571.1U CN201920309571U CN210283462U CN 210283462 U CN210283462 U CN 210283462U CN 201920309571 U CN201920309571 U CN 201920309571U CN 210283462 U CN210283462 U CN 210283462U
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Abstract
The utility model discloses a composite plastic shell and composite plastic cell phone case, this composite plastic shell include fiber structure ply and mould plastics at the transparent plastic extexine of ply surface, wherein form the bonding in the in-process part fused transparent plastic that moulds plastics gets into ply fibre space, still disclose this kind of composite plastic shell's preparation method and application. This composite plastic shell utilizes the surface hole structure of fibrous structure ply, and the plastics that melt gets into ply hole structure, forms the pinning effect, has promoted the combination area of contact of plastics with the ply to promote the cohesion of transparent plastic extexine and ply, promote the temperature resistant cycle number, solved the plastic film of transparent plastic extexine and in-mould decoration because thermal expansion coefficient is different, use fracture problem has effectively promoted the life of "in-mould decoration" outward appearance piece.
Description
Technical Field
The utility model relates to a structure preparation field, concretely relates to consumer electronics backplate structure preparation field, in particular to composite plastic shell and composite plastic cell phone case.
Background
With the rapid development of consumer electronics such as mobile phones, structural members such as housings (back panels) of consumer electronics have made great progress, but new problems are encountered. Especially, the future 5G era puts more severe requirements on the material of the consumer electronics housing (back panel). Traditional metal brings huge challenge to antenna design due to its shielding effect, and it will not be used for the manufacturing of 5G shell (backplate), and its low strength, the wearproof limit its application in jumbo size screen, ultra-thin field of plastics, in addition along with the improvement of consumer's aesthetic, traditional single metal casing and plastics material shell (backplate) will also be difficult to the consumers of motivating.
Promote the quality of the shell of low-cost plastics material through color spraying or color masterbatch mould plastics mode among the prior art and feel, but spraying or color masterbatch mould plastics and only be fit for realizing monochromatic plastics shell, adopt the printing to realize to polychrome collocation. However, the mobile phone shell gradually moves to a 3D curved surface structure, so that printing cannot be performed at small positions such as corners of a curved surface, color leakage is caused, and therefore in the field, "in-mold decoration" is gradually adopted to solve the problem, namely, color patterns are printed on a planar flexible PET plastic film, the printed plastic film is cut and then placed in a mold, and transparent plastic is injected on the surface of the plastic film to achieve the colorful plastic shell. In the scheme, the flexible plastic film and the transparent plastic are only combined in a surface-to-surface mode, the combination area is small, and the thermal expansion coefficients of the flexible plastic film and the transparent plastic are different, so that the composite shell cannot bear high and low temperature impact cracking in a temperature cycle test, and can be delaminated, cracked and damaged in subsequent use.
Disclosure of Invention
In view of the above, the present invention provides a composite plastic shell, which comprises a fiber structure paper layer and a transparent plastic outer surface layer injection-molded on the outer surface of the paper layer, wherein the partially melted transparent plastic enters into the fiber space of the paper layer to form a bonding during the injection molding process.
Preferably, the surface smoothness of the fiber structure paper layer is 700 s-1000 s.
Preferably, the injection pressure is 220MPa to 250MPa, and the dwell time is 10s to 40 s.
Preferably, the surface of the fiber structure paper layer is also provided with a layer of low polymer sizing material.
Preferably, the transparent plastic is one of acrylic plastic, polycarbonate plastic and poly-terephthalic acid plastic, and the outer layer of the injection-molded transparent plastic is 0.5 mm-1.2 mm thick.
Preferably, the thickness of the fiber structure paper layer is 0.13-0.65 mm.
In another aspect, the present invention provides a method for preparing a composite plastic housing, comprising the steps of:
a) placing the fiber structure paper layer into a die cavity;
b) the transparent plastic outer surface layer on the outer surface of the fiber structure paper layer enables the transparent plastic which is partially melted in the injection molding process
The material enters the fiber gaps of the paper layer to form bonding.
Preferably, a transparent oligomeric polymer sizing material is sprayed on one side of the fiber structure paper layer before step a).
Preferably, the surface smoothness of the fiber structure paper layer in the step a) is 700 s-1000 s, and the thickness is 0.07-0.25 mm;
preferably, the transparent plastic in the step b) is one of acrylic plastic, polycarbonate plastic and poly-p-phthalic plastic, the thickness of the outer surface layer of the injection-molded transparent plastic is 0.5 mm-1.2 mm, the injection-molding pressure is 220 MPa-250 MPa, and the pressure maintaining time is 10 s-40 s.
Still another aspect the utility model provides a composite plastic mobile phone shell, for foretell composite plastic shell, wherein the focus coincidence of transparent plastic extexine and fiber structure ply, transparent plastic extexine surround the area and be greater than fiber structure ply area for the ply edge is hugged closely in composite plastic shell internal surface, and composite plastic shell internal surface periphery does not have the ply, can not lead to daily use ply friction fracture.
The utility model has the advantages that: the invention discloses a composite plastic shell, which comprises a fiber structure paper layer and a transparent plastic outer surface layer injected on the outer surface of the paper layer, wherein part of molten transparent plastic enters fiber gaps of the paper layer to form bonding in the injection molding process, and also discloses a preparation method and application of the composite plastic shell. This composite plastic shell utilizes the surface hole structure of fibrous structure ply, and the plastics that melt gets into ply hole structure, forms the pinning effect, has promoted the combination area of contact of plastics with the ply to promote the cohesion of transparent plastic extexine and ply, promote the temperature resistant cycle number, solved the plastic film of transparent plastic extexine and in-mould decoration because thermal expansion coefficient is different, use fracture problem has effectively promoted the life of "in-mould decoration" outward appearance piece.
Drawings
Fig. 1 is a schematic diagram of a fiber structure paper layer without a glue layer after injection molding and bonding with a transparent injection molding shell, wherein 101 is the transparent injection molding shell, and 102 is the fiber structure paper layer.
Fig. 2 is a schematic diagram of a fiber structure paper layer of the spray sizing material layer after injection molding and bonding with a transparent injection molding shell, wherein 101 is the transparent injection molding shell, 102 is the fiber structure paper layer, and 103 is the sizing material layer.
Detailed Description
The invention is described in further detail below, wherein the raw materials and equipment used are commercially available without particular requirement. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
In view of the above, the present invention provides a composite plastic shell, which comprises a fiber structure paper layer and a transparent plastic outer surface layer injection-molded on the outer surface of the paper layer, wherein the partially melted transparent plastic enters into the fiber space of the paper layer to form a bonding during the injection molding process.
In the embodiment, the surface of the preferable fiber structure paper layer is decorated by the prior art means of ink printing, spraying and the like, and the fiber structure paper layer is made of fiber paper with a hole structure on the surface, such as relief printing paper, newsprint paper, offset printing paper, coated paper, book cover paper, dictionary paper, copy paper, paperboard and the like, and is preferably offset printing paper and coated paper. Preferably, the surface smoothness of the fiber structure paper layer is 700-1000 s, more preferably 800-900 s, too high surface smoothness causes too strong adhesion, paper tearing is easily caused, and early failure occurs, the printing ink printing effect is not good, the surface decoration is not beautiful enough, too high surface smoothness causes insufficient adhesion, early failure occurs in the using process, and similarly, the thickness of the fiber structure paper layer also affects the bonding force and the overall thickness of the shell, the thickness of the fiber structure paper layer in the example is 0.13-0.65 mm, and more preferably 0.26-0.52 mm.
The transparent plastic is common transparent plastic in the prior art, such AS one of PMMA, PS, PC, AS or SAN, MS and transparent PA or two blends with a compatibility coefficient of less than 2-5, the invention can be realized by the modified grafted product, the preferable transparent plastic in the embodiment is one of acrylic plastic, polycarbonate and poly terephthalic acid plastic, and the thickness of the outer layer of the injection-molded transparent plastic is 0.5 mm-1.2 mm. As shown in fig. 1, the schematic diagram of the injection-molded and bonded fiber-structured paper layer without a glue layer and the transparent injection-molded case is shown, wherein 101 is the transparent injection-molded case, and 102 is the fiber-structured paper layer.
In order to further improve the bonding force between the fiber structure paper layer and the transparent plastic, before injection molding, the surface of the fiber structure paper layer is also provided with a layer of oligomeric polymer sizing material, the oligomeric polymer sizing material is a polymer sizing material commonly used in the prior art, such as acrylic, polyvinyl alcohol, polyurethane sizing material or polyisocyanate sizing material, in the embodiment, the oligomeric polymer sizing material is preferably a polyisocyanate sizing material, the thickness of the sizing material is preferably more than 1um and less than 10um, the sizing material is used as a transition connection layer, the soft connection of the paper layer and the polymer is realized, and premature failure caused by overlarge performance difference between the fiber structure paper layer and the transparent plastic is prevented. As shown in fig. 2, the fiber structure paper layer of the sprayed sizing layer is bonded to the transparent injection-molded shell by injection molding, wherein 101 is the transparent injection-molded shell, 102 is the fiber structure paper layer, and 103 is the sizing layer.
Realize composite plastic shell's injection pressure temperature and dwell time requirement characteristic selection according to plastics are moulded plastics to do not have the special requirement restriction, preferred injection pressure 220MPa ~ 250MPa in this example, dwell time 10s ~ 40 s.
On the other hand, the utility model provides a preparation method of compound plastic casing, including following step:
a) placing the fiber structure paper layer into a die cavity; in this embodiment, the surface of the preferable fiber structure paper layer is subjected to surface decoration by the prior art means such as ink printing and spraying, and the fiber structure paper layer is made of fiber paper with a hole structure on the surface, such as relief printing paper, newsprint paper, offset printing paper, coated paper, book cover paper, dictionary paper, copy paper, and board paper, and preferably made of offset printing paper and coated paper. Preferably, the surface smoothness of the fiber structure paper layer is 700-1000 s, more preferably 800-900 s, too high surface smoothness causes too strong adhesion, paper tearing is easily caused, and early failure occurs, the printing ink printing effect is not good, the surface decoration is not beautiful enough, too high surface smoothness causes insufficient adhesion, early failure occurs in the using process, and similarly, the thickness of the fiber structure paper layer also affects the bonding force and the overall thickness of the shell, the thickness of the fiber structure paper layer in the example is 0.13-0.65 mm, and more preferably 0.26-0.52 mm. In this example, in order to further improve the performance of the paper, the bonding force between the fiber structure paper layer and the transparent plastic is further increased, before injection molding, the surface of the fiber structure paper layer is further provided with a layer of oligomeric polymer sizing material, which is a polymer sizing material commonly used in the prior art, such as acrylic, polyvinyl alcohol, polyurethane sizing material or polyisocyanate sizing material, in this example, a polyisocyanate sizing material is preferred, the thickness of the sizing material is preferably greater than 1um and less than 10um, the sizing material is used as a transition connection layer, the flexible connection between the paper layer and the polymer is realized, and premature failure due to the excessive difference between the performance of the fiber structure paper layer and the performance of the transparent plastic is prevented.
b) Adding transparent plastic into an injection molding machine, heating for injection molding, enabling part of molten transparent plastic to enter fiber gaps of the paper layer to form bonding on the outer surface layer of the transparent plastic on the outer surface of the fiber structure paper layer in the injection molding process, and cooling and demolding to obtain the composite plastic shell. This composite plastic shell utilizes the surface hole structure of fibrous structure ply, and the plastics that melt gets into ply hole structure, forms the pinning effect, has promoted the combination area of contact of plastics with the ply to promote the cohesion of transparent plastic extexine and ply, promote the temperature resistant cycle number, solved the plastic film of transparent plastic extexine and in-mould decoration because thermal expansion coefficient is different, use fracture problem has effectively promoted the life of "in-mould decoration" outward appearance piece. The transparent plastic used is common transparent plastic in the prior art, such AS one of PMMA, PS, PC, AS or SAN, MS and transparent PA or two blends with a compatibility coefficient of less than 2-5, the invention can be realized by the modified grafted product, in the embodiment, the preferred transparent plastic is one of acrylic plastic, polycarbonate and poly terephthalic acid plastic, and the thickness of the outer layer of the injection-molded transparent plastic is 0.5 mm-1.2 mm. Therefore, it should be noted that, in the injection molding process, according to the difference of the transparent plastics, the injection molding pressure temperature and the pressure maintaining time of the composite plastic shell according to the prior art are selected according to the injection molding requirement characteristics of the plastics, and there is no special requirement for limitation, in this example, the preferred injection molding pressure and pressure maintaining time are higher than those of the conventional technical means, so that sufficient transparent plastics can be ensured to enter the holes of the fiber structure paper layer, the bonding strength is further improved, the further preferred injection molding pressure is 220 MPa-250 MPa, and the pressure maintaining time is within the range of 10 s-40 s, so that not only is the bonding force ensured to be sufficient, but also the bonding force is ensured not to be too.
And cooling and demolding the complex obtained by injection molding to obtain the composite plastic mobile phone shell. In order to further improve the product quality, the surface of the product can be subjected to conventional mechanical processing such as polishing and grinding.
Still another aspect the utility model provides a composite plastic mobile phone shell, for foretell composite plastic shell, adopt the method preparation of foretell preparation to obtain, wherein the focus coincidence of transparent plastic extexine and fiber structure ply, transparent plastic extexine surrounds the area and is greater than fiber structure ply area for ply edge is hugged closely in composite plastic shell internal surface, and composite plastic shell internal surface periphery does not have the ply, can not lead to daily use ply friction fracture.
The following are examples of the present invention:
the raw materials and equipment used in examples 1 to 8 and comparative example 1 are commercially available and are not particularly required.
Printing ink on the surface of a fiber structure paper layer or PET for decoration, drying and cutting the fiber structure paper layer or PET into 4.9 inches, spraying 1-10 um high-molecular polyisocyanate sizing material on the surface of the fiber structure paper layer or PET, putting the fiber structure paper layer or PET into a 5-inch mobile phone mold after surface drying, closing the mold, performing injection molding according to the process conditions shown in the table 1, demolding, and obtaining the 5-inch composite plastic mobile phone shell, and placing the 5-inch composite plastic mobile phone shell at room temperature for 48 hours for testing. Wherein the injection molding temperature of the acrylic is 210 ℃, the injection molding temperature of the polycarbonate is 230 ℃, and the injection molding temperature of the poly (terephthalic acid) is 270 ℃.
Wherein the high-temperature test selects a high-temperature test box and a low-temperature test box to carry out the cyclic test at the temperature of minus 40 ℃ to 80 ℃ at the speed of 3 ℃/min until the joint is cracked or the surface of the paper layer is cracked, and the cycle times are counted. The smoothness is measured by a smoothness tester according to the measuring method of GB/T456-2002 paper and paperboard smoothness, and the same type of paper with the specification and the thickness of 0.26mm is adopted for the paperboard with the paper thickness of more than 0.5mm to replace the test.
Table 1 different material composite plastic mobile phone shell process conditions and circulation test result, can see from table 1 test result, compare with comparative example 1, embodiment 1 ~ 8 homoenergetic realizes the utility model discloses, even the test result of using the fibrous structure ply is obvious owing to using PET as the decorative layer. In the group of examples 1-8, the smoothness and thickness of the paper layer and the injection pressure and time have a great influence on the cycle performance, and when the smoothness is 700-1000 s and the thickness is 0.13-0.65 mm, the performance of the injection pressure in the range of 220-250 MPa is obviously better than the results of the other examples, namely the results of examples 1-4 are obviously better than the results of examples 5-8.
Table 1 process conditions and cycle test results for composite plastic housings of different materials
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. The composite plastic shell is characterized in that: the adhesive comprises a fiber structure paper layer and a transparent plastic outer surface layer which is injected on the outer surface of the paper layer, wherein part of molten transparent plastic enters fiber gaps of the paper layer to form adhesion in the injection molding process.
2. The composite plastic shell of claim 1, wherein: the surface smoothness of the fiber structure paper layer is 700 s-1000 s.
3. The composite plastic shell of claim 2, wherein: the surface of the fiber structure paper layer is also provided with a layer of oligomeric macromolecular sizing material.
4. The composite plastic shell of claim 3, wherein: the transparent plastic is one of acrylic plastic, polycarbonate plastic and poly-p-phthalic plastic, and the outer layer of the injection-molded transparent plastic is 0.5 mm-1.2 mm thick.
5. The composite plastic shell of claim 4, wherein: the thickness of the fiber structure paper layer is 0.13 mm-0.65 mm.
6. The composite plastic mobile phone shell is the composite plastic shell as claimed in any one of claims 1 to 5, and is characterized in that: the center of gravity of the transparent plastic outer surface layer is superposed with that of the fiber structure paper layer, and the area enclosed by the transparent plastic outer surface layer is larger than that of the fiber structure paper layer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109940927A (en) * | 2019-03-12 | 2019-06-28 | 南通通州湾新材料科技有限公司 | Composite plastic shell and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109940927A (en) * | 2019-03-12 | 2019-06-28 | 南通通州湾新材料科技有限公司 | Composite plastic shell and its preparation method and application |
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Effective date of registration: 20211231 Address after: 233299 plant 20, East District, new material Photoelectric Industrial Park, Dingcheng Town Economic Development Zone, Dingyuan County, Chuzhou City, Anhui Province Patentee after: Anhui Tongwan Technology Co.,Ltd. Address before: 226333 southeast of the intersection of Tonghai Avenue and rugang Road, Lingang Industrial Park, Tongzhou Bay, Nantong City, Jiangsu Province Patentee before: TONGZHOU BAY NEW MATERIAL TECHNOLOGY CO.,LTD. Patentee before: Zhou Tao |
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