CN113292798B - Display device, modified ABS material and preparation method thereof - Google Patents

Display device, modified ABS material and preparation method thereof Download PDF

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CN113292798B
CN113292798B CN202110502162.5A CN202110502162A CN113292798B CN 113292798 B CN113292798 B CN 113292798B CN 202110502162 A CN202110502162 A CN 202110502162A CN 113292798 B CN113292798 B CN 113292798B
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CN113292798A (en
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孙言丽
房晓勇
赵志远
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Hisense Visual Technology Co Ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C—CHEMISTRY; METALLURGY
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract

The invention provides a display device, a modified ABS material and a preparation method thereof. The modified ABS material comprises 25-40 parts by weight of terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer; the terpolymer comprises 80-90 parts by weight of methyl methacrylate-butadiene-styrene and 10-20 parts by weight of modifier, wherein the modifier comprises organic silicon microspheres and inorganic silica gel particles, and the weight ratio of the organic silicon microspheres to the inorganic silica gel particles is (0.5-1.5): (0-7), the particle size of the organic silicon microspheres is 18-60 mu m, the particle size of the inorganic silica gel particles is 0.5-2.5 mm, each inorganic silica gel particle is provided with a through hole, and the aperture of each through hole is 2.5-3.5 nm. Methyl methacrylate-butadiene-styrene is modified by a modifier to obtain a semitransparent modified ABS material, and the modified ABS material has good associativity with a common non-transparent ABS material.

Description

Display device, modified ABS material and preparation method thereof
Technical Field
The invention relates to the technical field of display equipment, in particular to display equipment, a modified ABS material and a preparation method thereof.
Background
The display device is applied to the life of a user and can display different interfaces for the user to watch, wherein the display device mainly comprises a television, a display and the like.
At present, more and more display device begins to adopt down preceding shell and display module group complex scheme, can reduce assemble time and expense, promotes the figurative ornamental of outward appearance simultaneously.
The lower front shell is usually formed by adopting an extrusion molding process, and compared with the conventional injection molding process, the consumption of steel for a mold can be greatly saved. Meanwhile, the lower front shell is co-extruded by using the same plastic, namely acrylonitrile-butadiene-styrene copolymer (ABS for short), so that the recycling of the lower front shell during waste is facilitated.
Wherein, the ABS material is formed by distributing butadiene-styrene rubber phase in acrylonitrile-styrene copolymer continuous phase. However, the size of the rubber phase is typically larger than the visible wavelength, preventing the passage of light. In addition, the refractive index of the rubber phase is different from that of the continuous phase, and light passes through the interface of the two phases and undergoes multiple refraction and reflection, so that the ABS material is opaque. The existing improvement method is to control the particle size of the rubber phase at the lower limit of the visible light wavelength, improve the refractive index of the rubber phase to match with the continuous refractive index, and realize the transparency of the ABS material, but the reduction of the particle size of the rubber phase influences the impact strength of the ABS material and causes the reduction of the mechanical property. After the part is co-extruded with the opaque ABS and tempered, stress lines exist at the interface of the transparent part and the opaque part due to the difference of the strength of the part and the opaque ABS, so that the mechanical property of the lower front shell is reduced.
Disclosure of Invention
The invention aims to provide a display device, a modified ABS material and a preparation method thereof, and aims to solve the problem that the mechanical property of a lower front shell is poor in the prior art.
In order to solve the technical problems, the invention provides a modified ABS material, which comprises 25-40 parts by weight of terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer;
the terpolymer comprises 80-90 parts by weight of methyl methacrylate-butadiene-styrene and 10-20 parts by weight of a modifier, wherein the modifier comprises organic silicon microspheres and inorganic silica gel particles, and the weight ratio of the organic silicon microspheres to the inorganic silica gel particles is (0.5-1.5): (0-7), the particle size of the organic silicon microspheres is 18-60 mu m, the particle size of the inorganic silica gel particles is 0.5-2.5 mm, each inorganic silica gel particle is provided with a through hole, and the aperture of each through hole is 2.5-3.5 nm.
In one embodiment, the particle size of the organic silicon microsphere is 30-50 μm.
In one embodiment, the particle size of the inorganic silica gel particles is 1 to 2 mm.
In one embodiment, the silicone microspheres have the formula:
Figure BDA0003056834460000021
wherein R1, R2, R3, R4, R5 and R6 are all alkyl.
In one embodiment, the modified ABS material further comprises 1-2.5 parts by weight of an antioxidant; the antioxidant comprises a main antioxidant and an auxiliary antioxidant, and the proportion of the main antioxidant to the auxiliary antioxidant is 5: 1, the primary antioxidant is a hydrogen-donating antioxidant, and the secondary antioxidant is a peroxide decomposer.
The invention also provides a preparation method of the modified ABS material, which comprises the following steps:
weighing 80-90 parts by weight of methyl methacrylate-butadiene-styrene and 10-20 parts by weight of a modifier; the modifier comprises organic silicon microspheres and inorganic silica gel particles, wherein the weight ratio of the organic silicon microspheres to the inorganic silica gel particles is (0.5-1.5): (0-7), the particle size of the organic silicon microspheres is 30-50 μm, the particle size of the inorganic silica gel particles is 1-2 mm, the inorganic silica gel particles are provided with through holes, and the aperture of each through hole is 2.5-3.5 nm;
carrying out hot-oxygen blending on the methyl methacrylate-butadiene-styrene and the modifier for 5-15 min at the screw temperature of 200-230 ℃ and the screw rotating speed of 40-80 r/s, and carrying out extrusion, water cooling and granulation to obtain a terpolymer;
weighing 25-40 parts by weight of the terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer, and uniformly mixing to obtain a mixture;
adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the machine head of a charging barrel to be respectively: 190 ℃ at 180 ℃, 205 ℃ at 195 ℃, 220 ℃ at 210 ℃ and 230 ℃ at 215 ℃, wherein the rotating speed of a head screw is controlled at 60-80r/min, and the molten material extruded by the double-screw extruder is subjected to water cooling, granulation, sieving and drying to obtain the modified ABS material.
The invention also provides a display device, comprising a lower front shell and a light-emitting piece; the lower front shell comprises a front plate, a bottom plate and a connecting plate, wherein the front plate, the bottom plate and the connecting plate are integrally formed, and the bottom plate is perpendicular to the front plate; the luminous piece is located behind the connecting plate, the connecting plate is made of transparent materials, and the front plate and the bottom plate are made of opaque materials.
In one embodiment, the transparent material is a modified ABS material as described above;
the lower front shell is manufactured by extrusion molding.
In one embodiment, the connecting plate extends along the length direction of the lower front shell and is integrally formed.
In one embodiment, the light transmittance of the connection plate is 30% to 80%.
According to the technical scheme, the invention has the advantages and positive effects that:
the modified ABS material of the invention modifies methyl methacrylate-butadiene-styrene through the modifier, has better associativity with common non-transparent ABS materials, and the preparation method of the modified ABS material has simple and convenient operation and high preparation efficiency.
The lower front shell of the display device is made of the modified ABS material and the common ABS material, so that the modified ABS material and the common ABS material are combined well, stress lines do not exist, and therefore the display device is good in light transmission and good in mechanical property and meets use requirements. In addition, the modified ABS material and the common non-transparent ABS material both belong to ABS, so that the lower front shell is convenient to recycle, and is green and environment-friendly.
Drawings
FIG. 1 is a flow chart of a method for preparing a modified ABS material according to the present invention.
Fig. 2 is a side view of the display device of the present invention.
Fig. 3 is an enlarged view at a in fig. 2.
Fig. 4 is a schematic view of the structure of the lower front case of the present invention.
Fig. 5 is a schematic view showing the construction of an apparatus for extrusion molding a lower front shell according to the present invention.
The reference numerals are explained below: 1. a lower front shell; 11. a front plate; 12. a base plate; 13. a connecting plate; 2. a light emitting member; 3. a display module; 4. a mold; 5. a first extruder; 6. a second extruder.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
It should be noted that the lower front shell may be made by co-extruding a transparent material and an opaque material through a co-extrusion process.
However, in the co-extrusion molding, after passing through a die and a cooling water tank, molecular chains are forced to be aligned in an orientation state and are in a metastable state. In the tempering process, molecular chains automatically tend to return to a stable arrangement state under the driving of temperature. When the molecular chain of the oriented molecular chain is de-oriented during tempering treatment, the size of the co-extruded part is shrunk macroscopically, and when the shrinkage is generated at the interface of transparent ABS and non-transparent ABS, stress lines can be generated due to the difference of the performances of the two materials, so that the lower front shell is easy to deform and even break.
Therefore, the application provides a modified ABS material which is a semitransparent material and can be well combined with a non-transparent ABS material.
The light transmittance of the modified ABS material in the application is 30-80%, so that the modified ABS material is called as a semitransparent material.
The opaque material is a non-transparent material, that is, the material with the light transmittance of 0 is a non-transparent material. Specifically, the modified ABS material comprises 25-40 parts by weight of terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer. Styrene-acrylonitrile copolymer (SAN), also known AS resin, is a colorless and transparent thermoplastic resin, and has high temperature resistance, excellent gloss and chemical medium resistance, excellent hardness, rigidity, dimensional stability and high load-bearing capacity.
The terpolymer comprises 80-90 parts by weight of methyl methacrylate-butadiene-styrene and 10-20 parts by weight of a modifier.
Methyl methacrylate-butadiene-styrene (buta-1,3-diene, methyl 2-methylproprop-2-enoate, styrene) is a ternary amorphous thermoplastic copolymer of methyl methacrylate, butadiene and styrene, also known as MBS resin. It is light yellow particle with light transmittance up to 85-90%.
The mechanism of methyl methacrylate-butadiene-styrene is as follows:
Figure BDA0003056834460000051
the modifier comprises organic silicon microspheres and inorganic silica gel particles. The weight ratio of the organic silicon microspheres to the inorganic silica gel particles is (0.5-1.5): (0 to 7). Namely, the organic silicon microspheres can be used as the modifier alone, or the organic silicon microspheres and the inorganic silica gel particles can be used in combination.
Specifically, the structural formula of the organic silicon microsphere is as follows:
Figure BDA0003056834460000052
wherein R1, R2, R3, R4, R5 and R6 in the structural formula are all alkane radicals. And the length of the carbon chain in R1, R2, R3, R4, R5, and R6 may be set as the case may be.
The shape of the organic silicon microsphere is spherical, and the particle size of the organic silicon microsphere is 18-60 mu m. Furthermore, the particle size of the organic silicon microspheres is 30-50 μm.
The reaction principle of the organic silicon microspheres and methyl methacrylate-butadiene-styrene is as follows:
Figure BDA0003056834460000053
after methyl methacrylate-butadiene-styrene is thermally oxidized, oxygen free radicals are formed, the oxygen free radicals are contacted with the organic silicon microspheres to replace alkane chains on the organic silicon microspheres, and the organic silicon microspheres are grafted on the methyl methacrylate-butadiene-styrene. And the methyl methacrylate-butadiene-styrene and the organic silicon microspheres are connected through Si-O bonds. The Si-O bonds have strong connecting force and are not easy to break when being impacted by external force.
The inorganic silica gel particles are transparent or milky granular solids and have an open porous structure. The molecular formula is mSiO2·nH2O, a structure having a plurality of repeating-O-Si-O-groups.
The inorganic silica gel particles are not limited in shape, and can be spherical, square or other irregular shapes.
The particle size of the inorganic silica gel particles is 0.5-2.5 mm. And each inorganic silica gel particle is provided with a through hole, and the aperture of the through hole is 2.5-3.5 nm.
Furthermore, the particle size of the inorganic silica gel particles is 1-2 mm.
The reaction principle of the organic silicon microspheres and the inorganic silica gel particles and methyl methacrylate-butadiene-styrene simultaneously is as follows:
Figure BDA0003056834460000061
wherein R represents an alkane group.
After methyl methacrylate-butadiene-styrene is thermally oxidized, oxygen free radicals are formed, part of the oxygen free radicals are in contact with the organic silicon microspheres and replace alkane chains on the organic silicon microspheres, part of the oxygen free radicals are adsorbed on the surfaces of the inorganic silica gel particles, the inorganic silica gel particles are dehydrated under the action of heat, Si-O bonds are grafted on the methyl methacrylate-butadiene-styrene, and the inorganic silica gel particles are connected with the methyl methacrylate-butadiene-styrene through the Si-O bonds. The Si-O bonds have strong connecting force and are not easy to break when being impacted by external force.
The side chain of the organic silicon microsphere is longer, so that the fluidity and the flexibility are better. The refractive index of the inorganic silica gel particles is similar to that of a common ABS material, but the side chain of the inorganic silica gel particles is short, and the fluidity and the flexibility are reduced due to excessive addition, so that the refractive index of the terpolymer can be closer to that of the styrene-acrylonitrile copolymer and the flexibility of the terpolymer can be ensured by matching the inorganic silica gel particles with the organic silicon microspheres.
The modified ABS material also comprises 1-2.5 parts by weight of antioxidant.
The antioxidant comprises a primary antioxidant and a secondary antioxidant. Wherein the weight ratio of the main antioxidant to the auxiliary antioxidant is 5: 1.
the primary antioxidant is a hydrogen-donating antioxidant, and the secondary antioxidant is a peroxide decomposer.
Specifically, the primary antioxidant is at least one of hindered phenol antioxidants or secondary amine antioxidants. The auxiliary antioxidant is at least one of phosphide or sulfide oxidative decomposition agent.
The modified ABS material also comprises 0-1.5 parts by weight of lubricant. The lubricant is at least one of paraffin wax or polyethylene wax.
In some embodiments, the methyl methacrylate-butadiene-styrene is modified by a modifier to provide a modified ABS material. The modified ABS material is transparent and can be well combined with an ordinary iron ABS material.
Referring to fig. 1, fig. 1 shows a flow chart of a method for preparing a modified ABS material according to the present application, the method comprising the steps of:
s1, weighing 80-90 parts by weight of methyl methacrylate and 10-20 parts by weight of modifier.
S2, mixing methyl methacrylate and a modifier under the conditions that the screw temperature is 200-230 ℃, the screw rotating speed is 40-80 r/S, hot oxygen is mixed for 5-15 min, extruding, cooling and granulating to obtain the terpolymer.
S3, weighing 25-40 parts by weight of terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer, and uniformly mixing to obtain a mixture.
S4, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: 190 ℃ at 180 ℃, 205 ℃ at 195 ℃, 220 ℃ at 210 ℃ and 230 ℃ at 215 ℃, wherein the rotation speed of a head screw is controlled at 60-80r/min, and the molten material extruded by the double-screw extruder is subjected to water cooling, granulation, sieving and drying to obtain the modified ABS material.
The inventors of the present application realized good light transmittance and compatibility of the modified ABS material by strictly designing the content of each component, which is described below by examples.
Example 1
The modified ABS material comprises, by weight, 65 parts of styrene-acrylonitrile copolymer, 25 parts of terpolymer, 1 part of antioxidant and 1.5 parts of lubricant. The terpolymer comprises, by weight, 80 parts of methyl methacrylate-butadiene-styrene, 7.5 parts of organosilicon microspheres and 3.5 parts of inorganic silica gel particles.
The preparation method of the modified ABS material comprises the following steps:
s11, weighing the components in the terpolymer according to the parts by weight of the components in the terpolymer.
S12, mixing methyl methacrylate and a modifier under the conditions that the screw temperature is 200 ℃, the screw rotating speed is 80r/S, carrying out hot-oxygen blending for 15min, extruding, cooling and granulating to obtain the terpolymer.
S13, weighing the terpolymer and the styrene-acrylonitrile copolymer according to the weight parts of the modified ABS, and uniformly mixing to obtain a mixture.
S14, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: controlling the rotation speed of a head screw at 60r/min at 190 ℃, 205 ℃, 220 ℃ and 230 ℃, and carrying out water cooling, grain cutting, sieving and drying on the molten material extruded by the double-screw extruder to obtain the modified ABS material.
Example 2
The modified ABS material comprises, by weight, 60 parts of styrene-acrylonitrile copolymer, 30 parts of terpolymer, 1 part of antioxidant and 1.5 parts of lubricant. The terpolymer comprises 90 parts by weight of methyl methacrylate-butadiene-styrene, 13.64 parts by weight of organic silicon microspheres and 6.36 parts by weight of inorganic silica gel particles.
The preparation method of the modified ABS material comprises the following steps:
s21, weighing the components in the terpolymer according to the parts by weight of the components in the terpolymer.
S22, mixing methyl methacrylate and a modifier under the conditions that the screw temperature is 230 ℃, the screw rotating speed is 40r/S, carrying out hot-oxygen blending for 5min, extruding, cooling and granulating to obtain the terpolymer.
S23, weighing the terpolymer and the styrene-acrylonitrile copolymer according to the weight parts of the modified ABS, and uniformly mixing to obtain a mixture.
S24, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: controlling the rotation speed of a head screw at 70r/min at 190 ℃, 205 ℃, 220 ℃ and 230 ℃, and carrying out water cooling, grain cutting, sieving and drying on the molten material extruded by the double-screw extruder to obtain the modified ABS material.
Example 3
The modified ABS material comprises, by weight, 55 parts of styrene-acrylonitrile copolymer, 35 parts of terpolymer and 2.5 parts of antioxidant. Wherein the terpolymer comprises 80 parts by weight of methyl methacrylate-butadiene-styrene and 10 parts by weight of silicone microspheres.
The preparation method of the modified ABS material comprises the following steps:
s31, weighing the components in the terpolymer according to the parts by weight of the components in the terpolymer.
S32, mixing methyl methacrylate and a modifier under the conditions that the screw temperature is 210 ℃, the screw rotating speed is 60r/S, hot oxygen is mixed for 10min, extruding, cooling and granulating to obtain the terpolymer.
S33, weighing the terpolymer and the styrene-acrylonitrile copolymer according to the weight parts of the modified ABS, and uniformly mixing to obtain a mixture.
S34, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: controlling the rotation speed of a head screw at 80r/min at 180 ℃, 195 ℃, 210 ℃ and 215 ℃, and carrying out water cooling, grain cutting, sieving and drying on the molten material extruded by the double-screw extruder to obtain the modified ABS material.
Example 4
The modified ABS material comprises, by weight, 55 parts of styrene-acrylonitrile copolymer, 40 parts of terpolymer, 1 part of antioxidant and 1.5 parts of lubricant. The terpolymer comprises 90 parts by weight of methyl methacrylate-butadiene-styrene, 5 parts by weight of organic silicon microspheres and 7 parts by weight of inorganic silica gel particles.
The preparation method of the modified ABS material comprises the following steps:
and S41, weighing the components in the terpolymer according to the parts by weight of the components in the terpolymer.
S42, mixing methyl methacrylate and a modifier with hot oxygen for 12min at the screw temperature of 220 ℃ and the screw rotating speed of 50r/S, extruding, cooling with water and granulating to obtain the terpolymer.
And S43, weighing the terpolymer and the styrene-acrylonitrile copolymer according to the weight parts of the modified ABS, and uniformly mixing to obtain a mixture.
S44, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: controlling the rotation speed of a head screw at 65r/min at 180 ℃, 195 ℃, 210 ℃ and 215 ℃, and carrying out water cooling, grain cutting, sieving and drying on the molten material extruded by the double-screw extruder to obtain the modified ABS material.
Example 5
The modified ABS material comprises, by weight, 45 parts of styrene-acrylonitrile copolymer, 35 parts of terpolymer, 2 parts of antioxidant and 1 part of lubricant. The terpolymer comprises 85 parts by weight of methyl methacrylate-butadiene-styrene, 10 parts by weight of organic silicon microspheres and 4 parts by weight of inorganic silica gel particles.
The preparation method of the modified ABS material comprises the following steps:
s51, weighing the components in the terpolymer according to the parts by weight of the components in the terpolymer.
S52, mixing methyl methacrylate and a modifier under the conditions that the screw temperature is 215 ℃, the screw rotating speed is 70r/S, carrying out hot-oxygen blending for 8min, extruding, cooling and granulating to obtain the terpolymer.
S53, weighing the terpolymer and the styrene-acrylonitrile copolymer according to the weight parts of the modified ABS, and uniformly mixing to obtain a mixture.
S54, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: 185 ℃, 200 ℃, 215 ℃ and 220 ℃, wherein the rotating speed of a head screw is controlled at 65r/min, and the modified ABS material is obtained by water cooling, granulating, sieving and drying the molten material extruded by a double-screw extruder.
Example 6
The modified ABS material comprises, by weight, 50 parts of styrene-acrylonitrile copolymer, 30 parts of terpolymer, 2 parts of antioxidant and 1.5 parts of lubricant. The terpolymer comprises 88 parts by weight of methyl methacrylate-butadiene-styrene, 10 parts by weight of organic silicon microspheres and 6 parts by weight of inorganic silica gel particles.
The preparation method of the modified ABS material comprises the following steps:
and S61, weighing the components in the terpolymer according to the parts by weight of the components in the terpolymer.
S62, mixing methyl methacrylate and a modifier under the conditions that the screw temperature is 215 ℃, the screw rotating speed is 70r/S, carrying out hot-oxygen blending for 8min, extruding, cooling and granulating to obtain the terpolymer.
S63, weighing the terpolymer and the styrene-acrylonitrile copolymer according to the weight parts of the modified ABS, and uniformly mixing to obtain a mixture.
S64, adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the head of the charging barrel to be respectively: 185 ℃, 200 ℃, 215 ℃ and 220 ℃, wherein the rotating speed of a head screw is controlled at 62r/min, and the molten material extruded by a double-screw extruder is subjected to water cooling, granulation, sieving and drying to obtain the modified ABS material.
Comparative example 1
By contrast with a conventional, commercially available, non-transparent ABS material
The modified ABS materials of examples 1 to 6 and the non-transparent ABS material of comparative example 1 were tested for tensile strength according to the standard ASTM D638, test conditions 5 mm/min. The flexural strength and flexural modulus were measured according to the standard ASTM D790, test condition 2.8 mm/min. The notched impact strength was tested according to standard ASTM D256, test conditions 23 ℃ (1/4). The test condition of the linear expansion coefficient is-30 to 60 ℃. The test results are shown in table 1:
TABLE 1 Properties of modified ABS materials
Figure BDA0003056834460000111
As can be seen from the table above, the performances of the modified ABS materials obtained in examples 1-6 are even better than those of the non-transparent ABS material in comparative example 1. Therefore, the modified ABS materials obtained in examples 1-6 can be well combined with non-transparent ABS materials.
The light transmittance of the examples 1-6 is 30% -80%, while the light transmittance of the non-transparent ABS material in the comparative example 1 is 0. And the light transmittance of the modified ABS material can be adjusted by adjusting the proportion of each component.
That is, the modified ABS material in the present application is a translucent material and can also be well combined with non-transparent ABS materials.
In some embodiments, conventional combinations and substitutions may be made by one skilled in the art in light of the disclosure of the application.
The invention also provides a display device which is applied to the life of a user and can display different interfaces for the user to watch, wherein the display device is mainly a television, a display and the like.
Referring to fig. 2 and 3, the display apparatus includes a lower front case 1, a light emitting member 2, a display module 3, and a frame structure.
Wherein, display module assembly 31's left side, top side and right side are protected and are fixed through frame structure. The lower front shell 1 is spliced below the display module 3 and combined with the frame structure to form a front shell of the display device.
In some embodiments, the lower front shell is a portion of the front shell and is a unitary component with other portions of the front shell.
The light emitting member 2 is located below the display module 3 and behind the lower front case 1. The luminous member 2 can emit light outwardly.
Referring to fig. 4, the lower front case 1 includes a front plate 11, a bottom plate 12, and a connection plate 13. The front plate 11 is parallel to the display module 3, and the bottom plate 12 is perpendicular to the display module 3, i.e. the front plate 11 is perpendicular to the bottom plate 12.
In some embodiments, the material of the connecting plate 13 is the modified ABS material. The front plate 11 and the bottom plate 12 are made of common non-transparent ABS material. That is, the light transmittance of the connection plate 13 is 30% to 80%, and the light transmittance of the front plate 11 and the bottom plate 12 is substantially 0.
In other embodiments, other transparent materials may be used for the connection plate 13.
The connecting plate 13 is positioned in front of the luminous element 2, and the limitation of the light transmittance of the connecting plate 13 can facilitate the interference of the light emitted by the luminous element 2 at the remote control receiving end.
In some embodiments, the remote control receiving end is also located behind the attachment plate 13, but is separate from the glowing member 2. The setting of connecting plate 13 luminousness can be that the light intensity attenuates gradually on the inside length direction of connecting plate of light that illuminating part 2 sent, and in connecting plate 13 in the direct ahead of remote control receiving terminal, the light that illuminating part 2 sent can not cause the interference to the infrared light of remote controller basically.
In some embodiments, the front panel 11 extends vertically and the bottom panel 12 extends horizontally during normal use of the display device. Herein, the normal use in the present application refers to a placed state in which the display device can be normally viewed by a user.
In some embodiments, the width of the display device in the horizontal direction is larger than the height of the display device in the vertical direction in a placed state where the display device is normally viewed by a user.
In some embodiments, the lower front shell covers the outside of the module in a horizontal direction along the length direction.
The front plate 11 is located in front of the display module, and a card slot is formed in one side of the front plate 11 close to the display module, namely, below the rear side. The front side wall of the clamping groove inclines upwards from front to back.
In some embodiments, a part of the front side of the connecting plate 13 is formed with a cambered protrusion, the cambered protrusion is located at a lower region of the front side of the connecting plate 13, and the upper region of the front side of the connecting plate 13 is a reference plane.
In some embodiments, the front plate 11 is provided with a front side surface and a bottom surface located on the ground side of the front plate 11, one end of the bottom surface on the ground side of the front plate 11 is connected with the front side surface of the front plate 11, and the other end is connected with a reference surface on the front side surface of the connecting plate 13, so that a clamping groove is formed between the ground side of the front plate 11 and the cambered surface of the connecting plate 13.
Specifically, the front plate 11 is made of an opaque material.
The connecting plate 13 connects the front plate 11 and the bottom plate 12. In some embodiments, the connecting plate 13 extends along the length direction of the lower front case 1 and is integrally formed. That is, the connection plate 13 is continuously provided along its own length direction. That is, the connection plate 13 extends from one end to the other end in the length direction of the lower front case 1.
The top of the front side of the connecting plate 13 has an inclined surface which is inclined upwards from front to back and is matched with the slot of the front plate 11, so that the top of the connecting plate 13 is positioned in the slot. By adopting the structural design, the splicing part between the transparent material, namely the connecting plate 13, and the opaque material, namely the front plate 11, can be hidden in the clamping groove of the front plate 11, so that the appearance of the lower front shell 1 is more attractive.
In some embodiments, an end of the joint surface of the connecting plate 13 and the front plate 11 facing the front of the display device is located at the bottom of the card slot.
In some embodiments, the junction of the connecting plate 13 and the front plate 11 is convex facing the inside of said front plate 11, so that light impinging on the junction surface can be reflected back to the inside of the connecting plate 13. In some embodiments, the forward facing side of the web 13 is curved. This structure enables the connecting plate 13 to function as a convex lens with respect to the light emitting member 2 located at the rear thereof, and to converge light, so that the light emitted from the light emitting member 2 can be better emitted outward.
The side of the connecting plate 13 adjacent to the display module, i.e., the lower side of the rear side, has an inclined surface that is inclined upward from front to rear.
The front side of the bottom plate 12, i.e., the side near the connecting plate 13, has a mating surface that is inclined upward from front to back, mating with the inclined surface on the rear side of the connecting plate 13. By adopting the structural design, the splicing part between the transparent material, namely the connecting plate 13, and the opaque material, namely the bottom plate 12, can be hidden at the rear side of the connecting plate 13, so that the appearance of the lower front shell 1 is more attractive.
The lower front case 1 is integrally formed through an extrusion molding process. Specifically, referring to fig. 5, the modified ABS material is fed into the first extruder 5, and the non-transparent ABS material is fed into the second extruder 6, and they are melted and plasticized together in the screw to form a uniform melt. Under the action of screw thrust, the non-transparent ABS material enters the die 4 through the first extruder 5, is divided into two parts in a runner of the die 4, is converged with the modified ABS material in the die 4, is continuously extruded and molded, and is subjected to finishing on the shape and size of the cross section through a shaping device. The shaped product is cooled and solidified in a water tank, the product is uniformly led out by a tractor, the extrusion process is stably carried out, the traction speed is high and low, the product is cut and placed according to the comprehensive consideration of the section size precision and the production efficiency.
The lower front shell 1 partially adopts modified ABS material and partially adopts non-transparent ABS material, and realizes the good combination of the two, the two have the same performance,
the invention realizes the basic consistency of the performances of the semitransparent ABS and the non-transparent ABS, and the stress lines are not generated when the parts formed by co-extruding the semitransparent ABS and the non-transparent ABS are tempered. In addition, the whole part of the lower front shell 1 is made of ABS material in an extrusion molding mode under natural light and in a cross section view, the semitransparent part can transmit light under strong light, and the non-transparent part can not transmit light.
Further, the light transmission effect of the lower front shell 1 can be adjusted by adjusting the formula proportion of the modified ABS material so as to meet the actual requirement.
According to the technical scheme, the invention has the advantages and positive effects that:
the modified ABS material of the invention modifies methyl methacrylate-butadiene-styrene through the modifier, has better associativity with common non-transparent ABS materials, and the preparation method of the modified ABS material has simple and convenient operation and high preparation efficiency.
Because the lower front shell of the display device is made of the modified ABS material and the common ABS material, the modified ABS material and the common ABS material are combined well, and stress lines do not exist, so that the display device has good light transmission and good mechanical property, and meets the use requirements. In addition, the modified ABS material and the common non-transparent ABS material both belong to ABS, so that the lower front shell is convenient to recycle, and is green and environment-friendly.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (9)

1. The modified ABS material is characterized by being a semitransparent material and comprising 25-40 parts by weight of terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer;
the terpolymer comprises 80-90 parts by weight of methyl methacrylate-butadiene-styrene and 10-20 parts by weight of a modifier, wherein the modifier comprises organic silicon microspheres and inorganic silica gel particles, and the weight ratio of the organic silicon microspheres to the inorganic silica gel particles is (0.5-1.5): (0-7), the particle size of the organic silicon microspheres is 18-60 μm, the particle size of the inorganic silica gel particles is 0.5-2.5 mm, each inorganic silica gel particle is provided with a through hole, the aperture of each through hole is 2.5-3.5 nm, and the molecular formula of the organic silicon microspheres is as follows:
Figure FDA0003601815950000011
wherein R1, R2, R3, R4, R5 and R6 are all alkyl.
2. The modified ABS material of claim 1, wherein the particle size of the silicone microspheres is 30-50 μm.
3. The modified ABS material of claim 1, wherein the inorganic silica gel particles have a particle size of 1-2 mm.
4. The modified ABS material of claim 1, wherein the modified ABS material further comprises 1-2.5 parts by weight of an antioxidant; the antioxidant comprises a main antioxidant and an auxiliary antioxidant, and the proportion of the main antioxidant to the auxiliary antioxidant is 5: 1, the primary antioxidant is a hydrogen-donating antioxidant, and the secondary antioxidant is a peroxide decomposer.
5. The preparation method of the modified ABS material is characterized by comprising the following steps:
weighing 80-90 parts by weight of methyl methacrylate-butadiene-styrene and 10-20 parts by weight of a modifier; the modifier comprises organic silicon microspheres and inorganic silica gel particles, wherein the weight ratio of the organic silicon microspheres to the inorganic silica gel particles is (0.5-1.5): (0-7), the particle size of the organic silicon microspheres is 30-50 μm, the particle size of the inorganic silica gel particles is 1-2 mm, the inorganic silica gel particles are provided with through holes, and the aperture of each through hole is 2.5-3.5 nm; the molecular formula of the organic silicon microsphere is as follows:
Figure FDA0003601815950000021
wherein R1, R2, R3, R4, R5 and R6 are all alkyl;
carrying out hot-oxygen blending on the methyl methacrylate-butadiene-styrene and the modifier for 5-15 min at the screw temperature of 200-230 ℃ and the screw rotating speed of 40-80 r/s, and carrying out extrusion, water cooling and granulation to obtain a terpolymer;
weighing 25-40 parts by weight of the terpolymer and 45-65 parts by weight of styrene-acrylonitrile copolymer, and uniformly mixing to obtain a mixture;
adding the mixture into a double-screw extruder, and controlling the temperatures of the front part, the middle part, the rear part and the machine head of a charging barrel to be respectively: 190 ℃ at 180 ℃, 205 ℃ at 195 ℃, 220 ℃ at 210 ℃ and 230 ℃ at 215 ℃, wherein the rotating speed of a head screw is controlled at 60-80r/min, and the molten material extruded by the double-screw extruder is subjected to water cooling, granulation, sieving and drying to obtain the modified ABS material, wherein the modified ABS material is a translucent material.
6. A display device includes a lower front case and a light emitting member; the lower front shell comprises a front plate, a bottom plate and a connecting plate, wherein the front plate, the bottom plate and the connecting plate are integrally formed, and the bottom plate is perpendicular to the front plate; the light-emitting piece is located behind the connecting plate, the connecting plate is made of a semitransparent material, the front plate and the bottom plate are made of an opaque material, and the semitransparent material is the modified ABS material as claimed in any one of claims 1 to 4.
7. The display device according to claim 6, wherein the lower front case is manufactured by extrusion molding.
8. The display device according to claim 6, wherein the connection plate extends in a length direction of the lower front case and is integrally formed.
9. The display device according to claim 6, wherein the connection plate has a light transmittance of 30% to 80%.
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