CN110868490A - Mobile phone back shell membrane with good low-temperature-resistant pasting property - Google Patents

Mobile phone back shell membrane with good low-temperature-resistant pasting property Download PDF

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Publication number
CN110868490A
CN110868490A CN201911193799.XA CN201911193799A CN110868490A CN 110868490 A CN110868490 A CN 110868490A CN 201911193799 A CN201911193799 A CN 201911193799A CN 110868490 A CN110868490 A CN 110868490A
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parts
mobile phone
back shell
shell membrane
phone back
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CN201911193799.XA
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冯宪轮
陈达舜
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Hunan Huaqing Technology Co Ltd
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Hunan Huaqing Technology Co Ltd
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Priority to CN201911193799.XA priority Critical patent/CN110868490A/en
Publication of CN110868490A publication Critical patent/CN110868490A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
    • H04M1/185—Improving the rigidity of the casing or resistance to shocks
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/222—Magnesia, i.e. magnesium oxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2265—Oxides; Hydroxides of metals of iron
    • C08K2003/2272—Ferric oxide (Fe2O3)
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Laminated Bodies (AREA)

Abstract

A cell-phone dorsal scale diaphragm that low temperature resistant is pasted and is covered nature is good includes: the composite layer and the insulating layer coated outside the composite layer form the mobile phone back shell membrane; the mobile phone back shell membrane comprises three layers which are stacked in sequence, and a sheath layer is coated outside the mobile phone back shell membrane; a first filling layer is arranged on a central layer formed by the mobile phone back shell membrane; a second filling layer is arranged between the two adjacent insulating layers and the sheath layer; and talcum powder is filled in gaps among the sheath layer, the insulating layer, the first filling layer and the second filling layer. According to the invention, the cold-resistant modification auxiliary agent is adopted to carry out cold-resistant modification on the methyl vinyl silicone rubber, the hydrogenated nitrile rubber, the acrylate rubber, the butyl rubber and the ethylene-octene copolymer, and the structure of the invention is combined, so that the prepared mobile phone back shell membrane can keep good flexibility at the temperature of-50 ℃ to-60 ℃, the elongation at break can reach 400-488%, and the tensile strength can reach 33-50 MPa.

Description

Mobile phone back shell membrane with good low-temperature-resistant pasting property
Technical Field
The invention belongs to the technical field of mobile phone back shell membranes, and particularly relates to a mobile phone back shell membrane with good low temperature resistance.
Background
In some severe cold areas, the mobile phone back shell membrane is usually required to be erected in an environment at 50 ℃ below zero, which requires that the mobile phone back shell membrane has strong low-temperature resistance; in addition, the phenomenon that the mobile phone back shell membrane is hardened, embrittled and even cracked can be caused by too low outdoor temperature, an uneven electric field is formed at the cracked position of the mobile phone by the embrittlement and cracking of the mobile phone back shell membrane, and the mobile phone is possibly broken down, so that the mobile phone is scrapped and is not beneficial to use.
Disclosure of Invention
In order to solve the above problems, the present invention provides a mobile phone back shell membrane with good low temperature resistance, comprising:
the composite layer and the insulating layer coated outside the composite layer form the mobile phone back shell membrane;
the mobile phone back shell membrane comprises three layers which are stacked in sequence, and a sheath layer is coated outside the mobile phone back shell membrane;
a first filling layer is arranged on a central layer formed by the mobile phone back shell membrane;
a second filling layer is arranged between the two adjacent insulating layers and the sheath layer;
talcum powder is filled in gaps among the sheath layer, the insulating layer, the first filling layer and the second filling layer;
the sheath layer comprises the following components in parts by mass: 10-30 parts of methyl vinyl silicone rubber, 10-25 parts of hydrogenated nitrile rubber, 15-20 parts of acrylate rubber, 20-25 parts of butyl rubber, 23-30 parts of ethylene-octene copolymer, 15-25 parts of cold-resistant modification auxiliary agent, 12-22 parts of white carbon black, 3-8 parts of ferric oxide, 2-4 parts of nano magnesium oxide, 3-6 parts of nano silicon dioxide, 2-4 parts of anti-aging agent, 10-16 parts of plasticizer, 1-2 parts of gamma-mercaptopropyl trioxysilane and 10-20 parts of coating modification auxiliary agent.
Preferably, the composite layer is formed by twisting a plurality of adhesive tapes, and the twist pitch diameter ratio is less than or equal to 5.
Preferably, each adhesive tape is formed by twisting copper wires with less than or equal to 10 layers and monofilament diameter of less than or equal to 0.2 mm.
Preferably, the material of the first filling layer is polyether polyurethane.
Preferably, the material of the second filling layer is natural rubber.
Preferably, the cold-resistant modification auxiliary comprises the following components in parts by mass: 50-70 parts of chlorinated polyethylene, 3-10 parts of potassium amine, 3-8 parts of allyl alcohol, 2-6 parts of sodium polyacrylate, 4-8 parts of dimethylolpropionic acid, 3-5 parts of montmorillonite nano clay, 5-8 parts of morpholine and 2-4 parts of dodecyl trimethyl ammonium chloride.
Preferably, the preparation method of the cold-resistant modification auxiliary agent comprises the following steps: mixing montmorillonite nano clay with morpholine, adding chlorinated polyethylene, uniformly stirring, heating at 40-70 ℃ for 15min, and cooling to room temperature; then adding the fully mixed potassium amine, allyl alcohol, sodium polyacrylate and dimethylolpropionic acid, and uniformly stirring; finally adding dodecyl trimethyl ammonium chloride heated to 80-95 ℃, and uniformly stirring; and drying to obtain the cold-resistant modification auxiliary agent.
Preferably, the coating modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polypropylene, 3-8 parts of ethylene alcohol and 2-6 parts of sodium polymethylene.
Preferably, the preparation method of the coating modification auxiliary agent comprises the following steps: mixing chlorinated polypropylene and ethylene alcohol, adding sodium polymethylene, stirring uniformly, heating at 30-80 ℃ for 10min, and cooling to room temperature; and drying to obtain the coating modification auxiliary agent.
The beneficial technical effects of the invention are as follows:
(1) the three insulating layers are arranged in three layers, the surfaces of the three insulating layers are contacted, the first filling layer is filled in the central gap of the three insulating layers, the second filling layer is filled in the gap between the insulating layer and the sheath layer, and the insulating layer is contacted with the sheath layer; this cell-phone dorsal scale diaphragm structure is more firm and make cell-phone dorsal scale diaphragm softer, when receiving external force and assault, has the impact of sufficient elasticity dispersion external force, better protection fine layer.
(2) According to the invention, the talcum powder is filled in the gap, so that the resistance to sliding between the wire layers is reduced when the mobile phone back shell membrane is bent or pulled and twisted, and the flexibility of the mobile phone back shell membrane is improved.
(3) The first filling layer adopts polyether polyurethane (TPU), and the TPU has the characteristics of high strength, low temperature resistance and the like, and further endows the mobile phone back shell membrane with excellent comprehensive properties of impact resistance, low temperature resistance and the like;
(4) according to the invention, the cold-resistant modification auxiliary agent is adopted to carry out cold-resistant modification on the methyl vinyl silicone rubber, the hydrogenated nitrile rubber, the acrylate rubber, the butyl rubber and the ethylene octene copolymer, and the structure of the invention is combined, so that the prepared mobile phone back shell membrane can keep good flexibility at the temperature of-50 ℃ to-60 ℃, the elongation at break can reach 400-488%, and the tensile strength can reach 37-46 MPa.
(5) The cold-resistant modification auxiliary prepared according to the raw materials, the proportion and the preparation method of the cold-resistant modification auxiliary in the sheath layer can effectively improve the cold resistance of the rubber and other raw materials in the sheath, and the cold resistance of the cold-resistant modification auxiliary is not obviously reduced after the cold-resistant modification auxiliary is mixed with the plasticizer, the coupling agent, the surfactant and the like.
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 description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
The low-temperature-resistant mobile phone back shell membrane comprises a composite layer, wherein the composite layer and an insulating layer coated outside the composite layer form a mobile phone back shell membrane; the mobile phone back shell membrane comprises three layers which are stacked in sequence, and a sheath layer is coated outside the mobile phone back shell membrane.
The composite layer is preferably formed by twisting a plurality of strands of adhesive tapes, the twisting pitch diameter ratio is less than or equal to 5, and each strand of adhesive tape is formed by twisting less than or equal to 10 layers of copper wires with the monofilament diameter of less than or equal to 0.2 mm. When the rubber strips form the composite layer, the pitch-diameter ratio is less than 5, so that the flexibility and the bending resistance of the composite layer can be further improved.
The center area formed by the mobile phone back shell membrane is provided with a first filling layer, the first filling layer is in contact with the mobile phone back shell membrane, the first filling layer is preferably made of polyether urethane (TPU), and the TPU has the characteristics of high strength, low temperature resistance and the like, and further endows the mobile phone back shell membrane with excellent comprehensive performances of impact resistance, low temperature resistance and the like.
Two adjacent the insulating layer with be provided with the second filling layer between the restrictive coating, the preferred natural rubber material of second filling layer, natural rubber has soft and super low temperature resistant performance, further increases the compliance and the low temperature resistant performance of cell-phone dorsal scale diaphragm.
The gaps between the sheath layer and the insulating layer, and between the first filling layer and the second filling layer are filled with talcum powder, so that the sliding resistance between the layers is reduced when the mobile phone back shell membrane is bent or pulled and twisted, and the flexibility of the mobile phone back shell membrane is improved.
The mobile phone back shell membrane is in contact with the sheath layer; this cell-phone dorsal scale diaphragm structure is more firm and make cell-phone dorsal scale diaphragm softer, when receiving external force and assault, has the impact of sufficient elasticity dispersion external force, better protection fine layer.
The sheath layer comprises the following components in parts by mass: 25 parts of methyl vinyl silicone rubber, 13 parts of hydrogenated nitrile rubber, 15 parts of acrylate rubber, 22 parts of butyl rubber, 24 parts of ethylene-octene copolymer, 18 parts of cold-resistant modification auxiliary agent, 14 parts of white carbon black, 5 parts of ferric oxide, 2 parts of nano magnesium oxide, 3 parts of nano silicon dioxide, 2 parts of anti-aging agent, 10 parts of plasticizer, 1 part of gamma-mercaptopropyl trioxysilane and 10 parts of coating modification auxiliary agent.
The cold-resistant modification auxiliary agent preferably comprises the following components in parts by mass: 50-70 parts of chlorinated polyethylene, 3-10 parts of potassium amine, 3-8 parts of allyl alcohol, 2-6 parts of sodium polyacrylate, 4-8 parts of dimethylolpropionic acid, 3-5 parts of montmorillonite nano clay, 5-8 parts of morpholine and 2-4 parts of dodecyl trimethyl ammonium chloride.
The preparation method of the cold-resistant modification auxiliary agent preferably comprises the following steps: the preparation method of the cold-resistant modification auxiliary agent comprises the following steps: mixing montmorillonite nano clay with morpholine, adding chlorinated polyethylene, uniformly stirring, heating at 40-70 ℃ for 15min, and cooling to room temperature; then adding the fully mixed potassium amine, allyl alcohol, sodium polyacrylate and dimethylolpropionic acid, and uniformly stirring; finally adding dodecyl trimethyl ammonium chloride heated to 80-95 ℃, and uniformly stirring; and drying to obtain the cold-resistant modification auxiliary agent.
The coating modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polypropylene, 3-8 parts of ethylene alcohol and 2-6 parts of sodium polymethylene.
The preparation method of the coating modification auxiliary agent comprises the following steps: mixing chlorinated polypropylene and ethylene alcohol, adding sodium polymethylene, stirring uniformly, heating at 30-80 ℃ for 10min, and cooling to room temperature; and drying to obtain the coating modification auxiliary agent.
Example 2
Based on example 1, this example illustrates the specific components and preparation method of the sheath layer as follows:
the sheath layer of the embodiment comprises the following components in parts by mass: 25 parts of methyl vinyl silicone rubber, 15 parts of hydrogenated nitrile rubber, 10 parts of acrylate rubber, 20 parts of butyl rubber, 23 parts of ethylene-octene copolymer, 15 parts of cold-resistant modification auxiliary agent, 12 parts of white carbon black, 3 parts of ferric oxide, 2 parts of nano magnesium oxide, 3 parts of nano silicon dioxide, 2 parts of anti-aging agent, 10 parts of plasticizer and 1 part of gamma-mercaptopropyl trioxysilane.
The cold-resistant modification auxiliary comprises the following components in parts by mass: 60 parts of chlorinated polyethylene, 5 parts of potassium amine, 3 parts of allyl alcohol, 4 parts of sodium polyacrylate, 5 parts of dimethylolpropionic acid, 3 parts of montmorillonite nano-clay, 5 parts of morpholine and 2 parts of dodecyl trimethyl ammonium chloride.
The preparation method of the cold-resistant modification auxiliary agent comprises the following steps: mixing montmorillonite nano clay with morpholine, adding chlorinated polyethylene, stirring uniformly, heating at 60-70 ℃ for 30min, and cooling to room temperature; then adding the fully mixed potassium amine, allyl alcohol, sodium polyacrylate and dimethylolpropionic acid, and uniformly stirring; finally adding dodecyl trimethyl ammonium chloride heated to 80-95 ℃, and uniformly stirring; and drying to obtain the cold-resistant modification auxiliary agent.
The coating modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polypropylene, 3-8 parts of ethylene alcohol and 2-6 parts of sodium polymethylene.
The preparation method of the coating modification auxiliary agent comprises the following steps: mixing chlorinated polypropylene and ethylene alcohol, adding sodium polymethylene, stirring uniformly, heating at 30-80 ℃ for 10min, and cooling to room temperature; and drying to obtain the coating modification auxiliary agent.
In this example, the antioxidant was p-phenylenediamine and the plasticizer was diisodecyl adipate.
Example 3
Different from example 2, the specific components and preparation method of the sheath layer of this example are as follows:
the sheath layer of the embodiment comprises the following components in parts by mass: 35 parts of methyl vinyl silicone rubber, 25 parts of hydrogenated nitrile rubber, 20 parts of acrylate rubber, 25 parts of butyl rubber, 34 parts of ethylene-octene copolymer, 22 parts of cold-resistant modification auxiliary agent, 20 parts of white carbon black, 5 parts of ferric oxide, 4 parts of nano magnesium oxide, 6 parts of nano silicon dioxide, 4 parts of anti-aging agent, 16 parts of plasticizer and 2 parts of gamma-mercaptopropyl trioxysilane.
The cold-resistant modification auxiliary comprises the following components in parts by mass: 70 parts of chlorinated polyethylene, 10 parts of potassium amine, 4 parts of allyl alcohol, 6 parts of sodium polyacrylate, 8 parts of dimethylolpropionic acid, 5 parts of montmorillonite nano-clay, 8 parts of morpholine and 4 parts of dodecyl trimethyl ammonium chloride.
The preparation method of the cold-resistant modification auxiliary agent comprises the following steps: mixing montmorillonite nano clay with morpholine, adding chlorinated polyethylene, stirring uniformly, heating at 60-70 ℃ for 30min, and cooling to room temperature; then adding the fully mixed potassium amine, allyl alcohol, sodium polyacrylate and dimethylolpropionic acid, and uniformly stirring; finally adding dodecyl trimethyl ammonium chloride heated to 80-95 ℃, and uniformly stirring; and drying to obtain the cold-resistant modification auxiliary agent.
The coating modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polypropylene, 3-8 parts of ethylene alcohol and 2-6 parts of sodium polymethylene.
The preparation method of the coating modification auxiliary agent comprises the following steps: mixing chlorinated polypropylene and ethylene alcohol, adding sodium polymethylene, stirring uniformly, heating at 30-80 ℃ for 10min, and cooling to room temperature; and drying to obtain the coating modification auxiliary agent.
In the embodiment, the anti-aging agent is ethoxyquinoline, and the plasticizer is hexamethylphosphoric triamide.
Example 4
Different from example 2, the specific components and preparation method of the sheath layer of this example are as follows:
the sheath layer of the embodiment comprises the following components in parts by mass: 30 parts of methyl vinyl silicone rubber, 20 parts of hydrogenated nitrile rubber, 19 parts of acrylate rubber, 22 parts of butyl rubber, 28 parts of ethylene-octene copolymer, 20 parts of cold-resistant modification auxiliary agent, 15 parts of white carbon black, 4 parts of ferric oxide, 3 parts of nano magnesium oxide, 4.5 parts of nano silicon dioxide, 3 parts of anti-aging agent, 14 parts of plasticizer and 2 parts of gamma-mercaptopropyl trioxysilane.
The cold-resistant modification auxiliary comprises the following components in parts by mass: 65 parts of chlorinated polyethylene, 7 parts of potassium amine, 4 parts of allyl alcohol, 5 parts of sodium polyacrylate, 6 parts of dimethylolpropionic acid, 4 parts of montmorillonite nano-clay, 6 parts of morpholine and 3 parts of dodecyl trimethyl ammonium chloride.
The preparation method of the cold-resistant modification auxiliary agent comprises the following steps: mixing montmorillonite nano clay with morpholine, adding chlorinated polyethylene, stirring uniformly, heating at 60-70 ℃ for 30min, and cooling to room temperature; then adding the fully mixed potassium amine, allyl alcohol, sodium polyacrylate and dimethylolpropionic acid, and uniformly stirring; finally adding dodecyl trimethyl ammonium chloride heated to 80-95 ℃, and uniformly stirring; and drying to obtain the cold-resistant modification auxiliary agent.
The coating modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polypropylene, 3-8 parts of ethylene alcohol and 2-6 parts of sodium polymethylene.
The preparation method of the coating modification auxiliary agent comprises the following steps: mixing chlorinated polypropylene and ethylene alcohol, adding sodium polymethylene, stirring uniformly, heating at 30-80 ℃ for 10min, and cooling to room temperature; and drying to obtain the coating modification auxiliary agent.
In this example, the antioxidant was N-cumene-N' -phenyl-p-phenylenediamine and the plasticizer was 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate.
Comparative example 1
The difference between the comparative example and the example 2 is that no cold-resistant modifier is added, namely the ultra-low temperature resistant and ice and snow resistant sheath for the mobile phone back shell membrane of the comparative example comprises the following components in parts by mass: 25 parts of methyl vinyl silicone rubber, 15 parts of hydrogenated nitrile rubber, 10 parts of acrylate rubber, 20 parts of butyl rubber, 23 parts of ethylene-octene copolymer, 12 parts of white carbon black, 3 parts of ferric oxide, 2 parts of nano magnesium oxide, 3 parts of nano silicon dioxide, 2 parts of anti-aging agent, 10 parts of plasticizer and 1 part of gamma-mercaptopropyl trioxysilane.
Comparative example 2
The difference between the comparative example and the example 2 is that nano magnesium oxide and nano silicon dioxide are not added, namely the ultra-low temperature resistant and ice and snow resistant sheath for the mobile phone back shell membrane of the comparative example comprises the following components in parts by mass: 25 parts of methyl vinyl silicone rubber, 15 parts of hydrogenated nitrile rubber, 10 parts of acrylate rubber, 20 parts of butyl rubber, 23 parts of ethylene-octene copolymer, 15 parts of cold-resistant modification auxiliary agent, 12 parts of white carbon black, 3 parts of ferric oxide, 2 parts of anti-aging agent, 10 parts of plasticizer and 1 part of gamma-mercaptopropyl trioxysilane.
Comparative example 3
The difference between this comparative example and embodiment 2 lies in adopting the very common cell-phone backshell diaphragm structure now, and the cell-phone backshell diaphragm is from inside to outside in proper order promptly: a conductor, an insulating layer and a sheath layer; the conductor is a copper wire layer, the insulating layer is made of the same material as the invention, and the sheath layer is made of the same material as the embodiment 2.
Comparative example 4
The difference between the comparative example and the comparative example 3 is that the material of the sheath layer is a rubber sheath, namely the structure of the invention is different from that of the sheath layer.
Various performance tests are carried out on the mobile phone back shell membranes prepared in the examples 2-4 and the comparative examples 1-4, and the test results are shown in the table 1.
Table 1 performance test results of the back cover film sheets of mobile phones prepared in examples 2 to 4 of the present invention and comparative examples 1 to 4
Figure BDA0002294217560000081
Figure BDA0002294217560000091
According to the invention, the cold-resistant modification auxiliary agent is adopted to carry out cold-resistant modification on the methyl vinyl silicone rubber, the hydrogenated nitrile rubber, the acrylate rubber, the butyl rubber and the ethylene-octene copolymer, and the structure of the invention is combined, so that the prepared mobile phone back shell membrane can keep good flexibility at the temperature of-50 ℃ to-60 ℃, the elongation at break can reach 400-488%, and the tensile strength can reach 33-50 MPa.
The beneficial technical effects of the invention are as follows:
(1) the three insulating layers are arranged in three layers, the surfaces of the three insulating layers are contacted, the first filling layer is filled in the central gap of the three insulating layers, the second filling layer is filled in the gap between the insulating layer and the sheath layer, and the insulating layer is contacted with the sheath layer; this cell-phone dorsal scale diaphragm structure is more firm and make cell-phone dorsal scale diaphragm softer, when receiving external force and assault, has the impact of sufficient elasticity dispersion external force, better protection fine layer.
(2) According to the invention, the talcum powder is filled in the gap, so that the resistance to sliding between the wire layers is reduced when the mobile phone back shell membrane is bent or pulled and twisted, and the flexibility of the mobile phone back shell membrane is improved.
(3) The first filling layer adopts polyether polyurethane (TPU), and the TPU has the characteristics of high strength, low temperature resistance and the like, and further endows the mobile phone back shell membrane with excellent comprehensive properties of impact resistance, low temperature resistance and the like;
(4) according to the invention, the cold-resistant modification auxiliary agent is adopted to carry out cold-resistant modification on the methyl vinyl silicone rubber, the hydrogenated nitrile rubber, the acrylate rubber, the butyl rubber and the ethylene octene copolymer, and the structure of the invention is combined, so that the prepared mobile phone back shell membrane can keep good flexibility at the temperature of-50 ℃ to-60 ℃, the elongation at break can reach 400-488%, and the tensile strength can reach 37-46 MPa.
(5) The cold-resistant modification auxiliary prepared according to the raw materials, the proportion and the preparation method of the cold-resistant modification auxiliary in the sheath layer can effectively improve the cold resistance of the rubber and other raw materials in the sheath, and the cold resistance of the cold-resistant modification auxiliary is not obviously reduced after the cold-resistant modification auxiliary is mixed with the plasticizer, the coupling agent, the surfactant and the like.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (9)

1. The utility model provides a cell-phone dorsal scale diaphragm that low temperature resistant is pasted and is covered nature is good which characterized in that includes:
the composite layer and the insulating layer coated outside the composite layer form the mobile phone back shell membrane;
the mobile phone back shell membrane comprises three layers which are stacked in sequence, and a sheath layer is coated outside the mobile phone back shell membrane;
a first filling layer is arranged on a central layer formed by the mobile phone back shell membrane;
a second filling layer is arranged between the two adjacent insulating layers and the sheath layer;
talcum powder is filled in gaps among the sheath layer, the insulating layer, the first filling layer and the second filling layer;
the sheath layer comprises the following components in parts by mass: 10-30 parts of methyl vinyl silicone rubber, 10-25 parts of hydrogenated nitrile rubber, 15-20 parts of acrylate rubber, 20-25 parts of butyl rubber, 23-30 parts of ethylene-octene copolymer, 15-25 parts of cold-resistant modification auxiliary agent, 12-22 parts of white carbon black, 3-8 parts of ferric oxide, 2-4 parts of nano magnesium oxide, 3-6 parts of nano silicon dioxide, 2-4 parts of anti-aging agent, 10-16 parts of plasticizer, 1-2 parts of gamma-mercaptopropyl trioxysilane and 10-20 parts of coating modification auxiliary agent.
2. The mobile phone back shell membrane with good low temperature resistance and good pasting property according to claim 1, wherein the composite layer is formed by twisting a plurality of strands of adhesive tapes, and the twisting pitch diameter ratio is less than or equal to 5.
3. The mobile phone back shell membrane with good low temperature resistance and good covering property according to claim 2, wherein each adhesive tape is formed by twisting copper wires with less than or equal to 10 layers and monofilament diameter of less than or equal to 0.2 mm.
4. The mobile phone back shell membrane with good low temperature resistance and good covering property of claim 1, wherein the first filling layer is made of polyether polyurethane.
5. The mobile phone back shell membrane with good low temperature resistance and good covering property of claim 1, wherein the second filling layer is made of natural rubber.
6. The mobile phone back shell membrane with good low temperature resistance pasting property according to claim 1, wherein the cold-resistant modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polyethylene, 3-10 parts of potassium amine, 3-8 parts of allyl alcohol, 2-6 parts of sodium polyacrylate, 4-8 parts of dimethylolpropionic acid, 3-5 parts of montmorillonite nano clay, 5-8 parts of morpholine and 2-4 parts of dodecyl trimethyl ammonium chloride.
7. The mobile phone back shell membrane with good low temperature resistance and good covering property according to claim 6, wherein the preparation method of the cold-resistant modification auxiliary agent comprises the following steps: mixing montmorillonite nano clay with morpholine, adding chlorinated polyethylene, uniformly stirring, heating at 40-70 ℃ for 15min, and cooling to room temperature; then adding the fully mixed potassium amine, allyl alcohol, sodium polyacrylate and dimethylolpropionic acid, and uniformly stirring; finally adding dodecyl trimethyl ammonium chloride heated to 80-95 ℃, and uniformly stirring; and drying to obtain the cold-resistant modification auxiliary agent.
8. The mobile phone back shell membrane with good low temperature resistance is characterized in that the coating modification auxiliary agent comprises the following components in parts by mass: 50-70 parts of chlorinated polypropylene, 3-8 parts of ethylene alcohol and 2-6 parts of sodium polymethylene.
9. The mobile phone back shell membrane with good low temperature resistance is characterized in that the preparation method of the coating modification auxiliary agent comprises the following steps: mixing chlorinated polypropylene and ethylene alcohol, adding sodium polymethylene, stirring uniformly, heating at 30-80 ℃ for 10min, and cooling to room temperature; and drying to obtain the coating modification auxiliary agent.
CN201911193799.XA 2019-11-28 2019-11-28 Mobile phone back shell membrane with good low-temperature-resistant pasting property Withdrawn CN110868490A (en)

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Application publication date: 20200306