CN114801244A - Lightweight 3D rear cover plate for mobile phone and machining process thereof - Google Patents
Lightweight 3D rear cover plate for mobile phone and machining process thereof Download PDFInfo
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- CN114801244A CN114801244A CN202210412313.2A CN202210412313A CN114801244A CN 114801244 A CN114801244 A CN 114801244A CN 202210412313 A CN202210412313 A CN 202210412313A CN 114801244 A CN114801244 A CN 114801244A
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- rear cover
- cover plate
- glass bead
- mobile phone
- lightweight
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/34—Feeding the material to the mould or the compression means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/28—Glass
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Signal Processing (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses a lightweight 3D rear cover plate for a mobile phone and a processing technology thereof. The machining process of the lightweight 3D rear cover plate comprises the following steps of: s1: uniformly mixing a curing agent, a curing accelerator and a catalyst solvent to obtain a mixture A; uniformly mixing the mixture A with resin; adding the glass bead compound, and uniformly stirring to obtain a glue solution; s2: arranging the glass fiber in a vertical gluing machine, coating glue solution, and drying to obtain a hollow glass bead layer; s3: and cutting the hollow glass bead layer according to a model, overlapping the panel layers up and down, layering the hollow glass bead layer in a 45-degree direction, overlapping and then placing in a mold for pressing to obtain the lightweight 3D rear cover plate. In the scheme, the requirements of the product on dimensional stability, high strength and temperature and humidity resistance are met by using the strength of the glass fiber cloth and the cured impregnation liquid. Meanwhile, the product is insulated, and has no obstruction to signals, so that the product has the advantage of light weight.
Description
Technical Field
The invention relates to the technical field of mobile phone rear cover plates, in particular to a lightweight 3D rear cover plate for a mobile phone and a processing technology thereof.
Background
With the development of communication and data technologies, especially the coming of the 5g era, the replacement speed of mobile phones is obviously accelerated, and the demands and experience of consumers on terminal electronic products such as mobile phone products and the like are gradually improved. The mobile phone rear cover plate is one of mobile phone components and is a protective umbrella of the mobile phone, so that accidental damage to the mobile phone can be effectively reduced, and the service life of the mobile phone is prolonged.
At present, the rear cover plate of communication equipment such as mobile phones and the like is mostly made of plastic, metal materials, glass and the like. These materials have advantages and disadvantages, and although plastics have strong plasticity, the strength is general, and the heat resistance is poor; the metal material has high strength and hardness, but has low processability and high cost, and has barrier property on signal transmission; compared with metal and plastic, the glass material has better impact resistance, thermal conductivity between the metal and the plastic, but has the defects of frangibility, easy fingerprint retention, limited elasticity and the like, cannot be bent and is greatly limited. Certainly, with the advancement of science and technology, the composite material for preparing the mobile phone rear cover with high strength and good signal by using high-performance fiber as a plastic reinforcing agent is also widely researched.
In the prior art, the composite rear cover plate for the rear cover of the mobile phone has the advantages that the strength of the rear cover plate is general, and the rear cover plate is easy to crack and wear due to poor interface action force between the fiber mesh and plastic and low interlayer fracture strength. The product has poor toughness, easy brittleness, general bending performance, and improved moisture resistance and heat resistance. Meanwhile, the light weight of the intelligent terminal is finished more and more, and products tend to be developed towards the directions of light weight and thin wall, so that the performances of protection, attractiveness and the like are achieved, but the strength of the products can be reduced due to the reduction of the weight of the products under the common condition.
In conclusion, the light-weight 3D rear cover plate for the mobile phone, which has the advantages of no obstruction to signal transmission, stable size, high strength, temperature and humidity resistance and the like, is prepared, and has important significance.
Disclosure of Invention
The invention aims to provide a lightweight 3D rear cover plate for a mobile phone and a processing technology thereof, and aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a processing technology of a lightweight 3D rear cover plate for a mobile phone comprises the following steps:
s1: uniformly mixing a curing agent, a curing accelerator, a catalyst and a solvent to obtain a mixture A; uniformly mixing the mixture A with resin; adding the glass bead compound, and uniformly stirring to obtain a glue solution;
s2: arranging the glass fiber in a vertical gluing machine, coating glue solution, and drying to obtain a hollow glass bead layer (prepreg);
s3: and cutting the hollow glass bead layer according to a model, vertically stacking and matching the panel layers in a 45-degree stacking direction, and placing the panel layers in a mold for pressing to obtain the lightweight 3D rear cover plate.
Preferably, the resin is one or more of phenolic resin, bisphenol A type epoxy resin and bisphenol F type epoxy resin; the curing agent is one or more of amine curing agent, anhydride curing agent and macromolecule curing agent; the curing accelerator is one or more of tertiary amine curing accelerators and imidazole curing accelerators; the solvent is one or more of acetone, butanone, dimethylformamide and propylene glycol methyl ether. Wherein the catalyst is dibutyltin dilaurate.
Preferably, the glue solution comprises the following components: 300-350 parts of resin, 5-10 parts of curing agent, 0.3-0.6 part of curing accelerator, 370-430 parts of solvent, 70-120 parts of glass bead compound and 0.1-0.2 part of catalyst.
Preferably, in step S2, the coating speed of the gluing machine is 8-12 m/min, and the weight of the hollow glass bead layer is 1.4-2.4 g/dm 2 (ii) a In the step S3, in the pressing process, the pressure is 5-15 kgf/cm 2 The pressing temperature is 120-180 ℃, and the pressing time is 150-350 seconds.
Preferably, the preparation method of the glass bead compound comprises the following steps: ultrasonically dispersing hollow glass beads in a composite solution containing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane, adding acetic acid to adjust the pH value to be 3.2-3.5, reacting for 2.5-3.5 hours, neutralizing by using sodium hydroxide, stirring for 40-60 minutes, washing and drying to obtain the glass bead composite.
Preferably, the solvent of the composite solution is ethanol, and the concentration of the solvent is 8-12 wt%; wherein the mass ratio of the 3- (2, 3-epoxypropoxy) propyl trimethoxy silane to the diphenyl dichlorosilane is 6 (3-4).
Preferably, in step S2, the glass fiber is placed in a suspension containing AlN/Al nanoparticles, subjected to an immersion reaction, washed, and dried; transferring the mixture into salicylic acid solution, performing reflux reaction, washing and drying; and (5) placing the glass beads in a vertical gluing machine, coating glue solution, and drying to obtain the hollow glass bead layer.
Optimally, the concentration of AlN/Al nano particles in the suspension is 1-2 wt%; in the process of the dipping reaction, setting the heating rate to be 0.5-0.6 ℃/min, heating to be 60-65 ℃, and the reaction time to be 40-60 minutes; the preparation method of the AlN/Al nano particles comprises the following steps: and (2) placing the nano aluminum powder in a high-temperature nitriding furnace, introducing a hydrogen-nitrogen mixed gas (the hydrogen content is 5%), and calcining at 900-1100 ℃ for 10-12 hours to obtain the AlN/Al nano particles.
Preferably, the concentration of the salicylic acid solution is 5-6 wt%; the mass ratio of the salicylic acid to the AlN/Al nano particles is 1 (1.5-2); in the reflux reaction process, the heating temperature is 100-102 ℃, and the reflux time is 6-8 hours.
Preferably, the lightweight 3D rear cover plate is prepared by the lightweight 3D rear cover plate processing technology for the mobile phone.
Wherein, the performance parameters of the hollow glass bead layer are that the fluidity is 0.5-5%, and the volatile content is controlled below 0.7%.
Wherein the panel layer is a sheet of epoxy resin, including but not limited to.
The lightweight 3D rear cover plate comprises a panel layer, a hollow glass bead layer and a panel layer from top right to bottom in sequence; wherein the total thickness of the lightweight 3D rear cover plate is 0.4 +/-0.03 mm; the thickness of the hollow glass bead layer is 0.1 +/-0.01 mm; the thickness of the panel layer is 0.1 +/-0.01 mm.
In the technical scheme, continuous electronic glass fiber cloth is used as a reinforcing material, and a vertical coating machine is used for coating lightweight glue solution containing hollow glass beads to prepare a hollow glass bead layer; then pressing the panel layer at a certain temperature and pressure to prepare a lightweight 3D rear cover plate; the requirements of the product on dimensional stability, high strength, temperature and humidity resistance are met by using the strength of the glass fiber cloth and the cured impregnation liquid. Meanwhile, the product is insulated, and has no obstruction to signals, so that the product has the advantage of light weight.
(1) In the scheme, through sandwich structure design scheme, fill hollow glass bead layer, on the basis of guaranteeing that intensity does not suffer loss, realize the lightweight of back shroud. Meanwhile, the layering direction of the glass fiber cloth is adjusted from common 90 degrees to 45 degrees, so that the internal and external bending shock resistance can be greatly improved.
(2) According to the scheme, the glass bead compound prepared from the hollow glass beads is used as a toughening agent, so that the brittleness of epoxy resin is effectively inhibited, the interlayer fracture toughness of the rear cover plate is enhanced, and the elastic modulus is increased; in the scheme, high-content glass beads are added, two silane coupling agents, namely 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane, are used, epoxy groups and silicon hydride groups are grafted on the surfaces of the silane coupling agents, and the silane coupling agents can react with an epoxy matrix to increase the reaction dispersity and similar compatible dispersity. The interface performance is enhanced, and the mechanical property is enhanced. Meanwhile, the used glass beads are made of hollow materials, so that the weight of the rear cover plate is reduced, and meanwhile, heat dissipation holes are increased.
In addition, diphenyl dichlorosilane is hydrolyzed to obtain diphenyl silanediol which is loaded on the hollow glass microspheres and can perform ring-opening reaction with epoxy groups under the action of a catalyst, so that the temperature and humidity resistance, the aging resistance and the heat resistance are enhanced. Because it can reduce the number of polar molecules in the system during the damp heat process. Meanwhile, the hydrophobicity is increased due to the process of removing thiol groups. Thereby improve the life of 3D back shroud. It should be noted that: because the glass bead compound has reactive crosslinking property, the proportion of the glass bead compound and a curing agent needs to be controlled, and meanwhile, the proportion of two silanes needs to be controlled, so that excessive crosslinking is prevented, and the performance is reduced.
(3) In order to improve the interface performance of the gum dipping solution and the surface of the glass fiber and enhance the heat dissipation, the glass fiber is arranged in a suspension containing AlN/Al nano particles with low concentration, the AlN/Al nano particles are heterogeneously condensed on the surface of the glass fiber due to the hydrophilicity of the surface of the glass fiber, and when the temperature is raised to be more than 60 ℃, the AlN/Al nano particles react with water to expand to form sheet boehmite which is embedded on the glass fiber cloth; thus, the surface of the material is rough, the mechanical embedding property between the material and the epoxy resin is enhanced, and the contact acting force is increased. Meanwhile, the surface of the 3D rear cover plate contains oxygen-containing groups, so that interface crosslinking can be increased, the elastic modulus is improved, and the flexibility of the 3D rear cover plate is better under the condition that the impact strength is not influenced.
Meanwhile, in order to further enhance the interface effect, in the scheme, the boehmite formed by further surface modification of salicylic acid is used, phenolic hydroxyl can directly act with an epoxy mechanism through a strong hydrogen bond, and meanwhile, the salicylic acid is also a curing accelerator, so that the tensile strength and the elastic modulus are further increased. It should be noted that, the solution uses AlN/Al nanoparticles with a lower concentration, and the higher concentration is not favorable for uniform deposition on the glass fiber cloth, and may cause partial aggregation, resulting in performance degradation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of a lightweight 3D tailgate;
FIG. 2 is a schematic view of the embodiment 9 after being bent inside and outside;
FIG. 3 is a schematic view of example 1 after being folded inward and outward.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the following examples, the preparation method of AlN/Al nanoparticles was: placing the nano aluminum powder in a high-temperature nitriding furnace, introducing hydrogen-nitrogen mixed gas (the hydrogen content is 5%), and calcining at 1000 ℃ for 12 hours to obtain AlN/Al nano particles.
Example 1:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 6:3.5, and preparing a composite solution with the concentration of 10 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass beads in the composite solution, adding acetic acid to adjust the pH value to 3.3, reacting for 3 hours, neutralizing by using sodium hydroxide, stirring for 45 minutes, washing and drying to obtain the glass bead composite. (2) Mixing 8 parts of curing agent, 0.5 part of curing accelerator, 0.15 part of catalyst and 400 parts of solvent for 1.5 hours at the stirring speed of 800rpm to obtain a mixture A; mixing the mixture A with 320 parts of resin for 3.5 hours at the stirring speed of 1000 rpm; adding 100 parts of glass bead compound, and mixing for 5.5 hours at the stirring speed of 1400rpm to obtain a glue solution;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 1.5 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.6 ℃/min, heating to 60 ℃, carrying out dipping reaction for 60 minutes, washing and drying; transferring the mixture into a salicylic acid solution with the concentration of 5 wt% (the mass ratio of the salicylic acid to the AlN/Al nano particles is 1:1.8), heating to 102 ℃, reacting for 6 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 10m/min, and drying at 180 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 10kgf/cm 2 And pressing at 150 ℃ for 300 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 2:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 6:3, and preparing a composite solution with the concentration of 8 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass beads in the composite solution, adding acetic acid to adjust the pH value to be 3.2, reacting for 3.5 hours, neutralizing by using sodium hydroxide, stirring for 60 minutes, washing and drying to obtain the glass bead composite. (2) Mixing 5 parts of curing agent, 0.3 part of curing accelerator, 0.1 part of catalyst and 370 parts of solvent for 2 hours at the stirring speed of 500rpm to obtain a mixture A; mixing the mixture A with 300 parts of resin for 4 hours at the stirring speed of 800 rpm; adding 70 parts of glass bead compound, and mixing for 6 hours at the stirring speed of 1200rpm to obtain a glue solution after the mixture is cured;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 1 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.5 ℃/min, heating to 60 ℃, carrying out dipping reaction for 60 minutes, washing and drying; transferring the mixture into a salicylic acid solution with the concentration of 5 wt% (the mass ratio of the salicylic acid to the AlN/Al nano particles is 1:1.5), heating to 100 ℃, reacting for 8 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 8m/min, and drying at 150 ℃ to obtain a hollow glass bead layer;
s3: cutting the hollow glass bead layer according to a model by 4Stacking the panel layers in a 5-degree stacking direction, placing the panel layers in a mold with a pressure of 5kgf/cm 2 And pressing at 180 ℃ for 150 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 3:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 6:4, and preparing a composite solution with the concentration of 12 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass beads in the composite solution, adding acetic acid to adjust the pH value to 3.5, reacting for 2.5 hours, neutralizing by using sodium hydroxide, stirring for 40 minutes, washing and drying to obtain the glass bead composite. (2) Mixing 10 parts of curing agent, 0.6 part of curing accelerator, 0.2 part of catalyst and 430 parts of solvent for 1 hour at the stirring speed of 1000rpm to obtain a mixture A; mixing the mixture A with 350 parts of resin for 3 hours at the stirring speed of 1200 rpm; adding 120 parts of glass bead compound, and mixing for 5 hours at the stirring speed of 1500rpm to obtain a glue solution;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 2 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.6 ℃/min, heating to 65 ℃, carrying out dipping reaction for 40 minutes, washing and drying; transferring the mixture into salicylic acid solution with the concentration of 6 wt% (the mass ratio of the salicylic acid to the AlN/Al nano particles is 1:2), heating to 100-DEG C, reacting for 6 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 12m/min, and drying at 190 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 15kgf/cm 2 And pressing at the pressing temperature of 120 ℃ for 350 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 4:
s1: (1) dispersing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane in an ethanol solvent to prepare a dispersion liquid with the concentration of 10 wt%; ultrasonically dispersing the hollow glass beads in the dispersion, adding acetic acid to adjust the pH value to 3.3, reacting for 3 hours, neutralizing by using sodium hydroxide, stirring for 45 minutes, washing and drying to obtain the glass bead compound. (2) Mixing 8 parts of curing agent, 0.5 part of curing accelerator, 0.15 part of catalyst and 400 parts of solvent for 1.5 hours at the stirring speed of 800rpm to obtain a mixture A; mixing the mixture A with 320 parts of resin for 3.5 hours at the stirring speed of 1000 rpm; adding 100 parts of glass bead compound, and mixing for 5.5 hours at the stirring speed of 1400rpm to obtain a glue solution;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 1.5 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.6 ℃/min, heating to 60 ℃, carrying out dipping reaction for 60 minutes, washing and drying; transferring the mixture into a salicylic acid solution with the concentration of 5 wt% (the mass ratio of the salicylic acid to the AlN/Al nano particles is 1:1.8), heating to 102 ℃, reacting for 6 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 10m/min, and drying at 180 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 10kgf/cm 2 And pressing at 150 ℃ for 300 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 5:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 3:6, and preparing a composite solution with the concentration of 10 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass beads in the composite solution, adding acetic acid to adjust the pH value to 3.3, reacting for 3 hours, neutralizing by using sodium hydroxide, stirring for 45 minutes, washing and drying to obtain the glass bead composite. (2) Mixing 8 parts of curing agent, 0.5 part of curing accelerator, 0.15 part of catalyst and 400 parts of solvent for 1.5 hours at the stirring speed of 800rpm to obtain a mixture A; mixing the mixture A with 320 parts of resin for 3.5 hours at the stirring speed of 1000 rpm; adding 100 parts of glass bead compound, and mixing for 5.5 hours at the stirring speed of 1400rpm to obtain a glue solution;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 1.5 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.6 ℃/min, heating to 60 ℃, carrying out dipping reaction for 60 minutes, washing and drying; transferring the mixture into a salicylic acid solution with the concentration of 5 wt% (the mass ratio of the salicylic acid to the AlN/Al nano particles is 1:1.8), heating to 102 ℃, reacting for 6 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 10m/min, and drying at 180 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 10kgf/cm 2 And pressing at 150 ℃ for 300 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 6:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 6:3.5, and preparing a composite solution with the concentration of 10 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass beads in the composite solution, adding acetic acid to adjust the pH value to 3.3, reacting for 3 hours, neutralizing by using sodium hydroxide, stirring for 45 minutes, washing and drying to obtain the glass bead composite. (2) Mixing 8 parts of curing agent, 0.5 part of curing accelerator, 0.15 part of catalyst and 400 parts of solvent for 1.5 hours at the stirring speed of 800rpm to obtain a mixture A; mixing the mixture A with 320 parts of resin for 3.5 hours at the stirring speed of 1000 rpm; adding 100 parts of glass bead compound, and mixing for 5.5 hours at the stirring speed of 1400rpm to obtain a glue solution;
s2: arranging the glass fiber in a salicylic acid solution with the concentration of 5 wt%, heating to 102 ℃, reacting for 6 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 10m/min, and drying at 180 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 10kgf/cm 2 And pressing at 150 ℃ for 300 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 7:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 6:3.5, and preparing a composite solution with the concentration of 10 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass microspheres in the composite solution, adding acetic acid to adjust the pH value to 3.3, reacting for 3 hours, neutralizing by using sodium hydroxide, stirring for 45 minutes, washing and drying to obtain the glass microsphere composite. (2) Mixing 8 parts of curing agent, 0.5 part of curing accelerator, 0.15 part of catalyst and 400 parts of solvent for 1.5 hours at the stirring speed of 800rpm to obtain a mixture A; mixing the mixture A with 320 parts of resin for 3.5 hours at the stirring speed of 1000 rpm; adding 100 parts of glass bead compound, and mixing for 5.5 hours at the stirring speed of 1400rpm to obtain a glue solution;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 6 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.6 ℃/min, heating to 60 ℃, carrying out dipping reaction for 60 minutes, washing and drying; transferring the mixture into a salicylic acid solution with the concentration of 5 wt% (the mass ratio of the salicylic acid to the AlN/Al nano particles is 1:1.8), heating to 102 ℃, reacting for 6 hours, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 10m/min, and drying at 180 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 10kgf/cm 2 And pressing at 150 ℃ for 300 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 8:
s1: (1) weighing 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and diphenyl dichlorosilane according to the mass ratio of 6:3.5, and preparing a composite solution with the concentration of 10 wt% in an ethanol solvent; ultrasonically dispersing the hollow glass beads in the composite solution, adding acetic acid to adjust the pH value to 3.3, reacting for 3 hours, neutralizing by using sodium hydroxide, stirring for 45 minutes, washing and drying to obtain the glass bead composite. (2) Mixing 8 parts of curing agent, 0.5 part of curing accelerator, 0.15 part of catalyst and 400 parts of solvent for 1.5 hours at the stirring speed of 800rpm to obtain a mixture A; mixing the mixture A with 320 parts of resin for 3.5 hours at the stirring speed of 1000 rpm; adding 100 parts of glass bead compound, and mixing for 5.5 hours at the stirring speed of 1400rpm to obtain a glue solution;
s2: arranging the glass fiber in a suspension of AlN/Al nano particles with the concentration of 1.5 wt%, setting the bath ratio to be 1:10, setting the heating rate to be 0.6 ℃/min, heating to 60 ℃, carrying out dipping reaction for 60 minutes, washing and drying; placing in a vertical gluing machine, coating glue solution at a set speed of 10m/min, and drying at 180 ℃ to obtain a hollow glass bead layer;
s3: cutting hollow glass bead layer according to a model, vertically stacking panel layers in a 45-degree stacking direction, placing in a mold, and setting pressure at 10kgf/cm 2 And pressing at 150 ℃ for 300 seconds to obtain the lightweight 3D rear cover plate.
Wherein the resin is a phenolic resin; the curing agent is an amine curing agent; the curing accelerator is tertiary amine curing accelerator; the solvent is acetone; the catalyst is dibutyltin dilaurate.
Example 9: glass fiber cloth is overlapped with panel layers up and down in the layering direction of 90 ℃; the rest is the same as in example 1.
Experiment 1: the lightweight 3D back cover for a mobile phone prepared in example 1 was used for basic performance testing.
And (4) conclusion: the experimental result shows that the prepared 3D rear cover plate has good thickness uniformity and accords with IPC/M level; the weight of the glass rear cover is 40 percent of that of the glass rear cover and 60 percent of that of the plastic rear cover; the bending performance is good, and the bending angle can be 40 degrees; the puncture resistance is good, and the puncture force reaches 80N; the plasticity is good, and the plastic radian can reach 90 degrees.
Experiment 2: the lightweight 3D rear cover for cellular phones obtained in examples 1 and 9 was subjected to an inside-outside bending test.
And (4) conclusion: the experimental results are shown in FIGS. 2 to 3: FIG. 2 shows a 90-degree ply with a glass fiber direction, FIG. 3 shows a 45-degree ply with a glass fiber direction, and it can be found that when the 90-degree ply is formed, a crease appears at 25 degrees of inward folding and a crack appears at 35 degrees of outward folding; however, the 45 degree ply is 90 degree non-creased. When the fiber direction is 45 degrees, the impact resistance of the inner and outer bends can be greatly improved.
Experiment 3: carrying out mechanical property test and damp and hot resistance test on the lightweight 3D rear cover plate for the mobile phone prepared in the embodiment 1-8; moisture and heat resistance test: soaking the sample in water at 85 ℃ and heating for 60 minutes, and measuring the tensile strength again to obtain a pull-up strength B so as to represent the variation difference; the results obtained are shown in the following table:
and (4) conclusion: the data of examples 1 to 3 show that the prepared 3D rear cover plate has high strength and high elastic modulus, good toughness, and good resistance to moist heat. The data for comparative examples 4 to 8 show that: in example 4, the strength against wet heat was reduced and the mechanical properties were slightly reduced because diphenyldichlorosilane-modified glass beads were not added; the reason is that: diphenyl silanediol obtained after hydrolysis of diphenyl dichlorosilane reacts with an epoxy group in a ring-opening reaction under the action of a catalyst, so that heat resistance is improved, hydrophobicity is increased, and the humidity resistance is enhanced. In example 5, due to the content change of the two silane coupling agents, the internal reactions are different, the degree of crosslinking is slightly excessive, and the elastic modulus is reduced; meanwhile, the compatibility is slightly reduced due to the increase of diphenyl silanediol; however, the reason why the wet heat resistance is slightly increased is that: more diphenyl silanediol was introduced. In example 6, since AlN/Al nanoparticles were not impregnated, and no flaky substance was embedded in the surface of the glass fiber cloth, the interfacial force was reduced, and the mechanical properties were reduced. In example 7, the use of AlN/Al nanoparticles at a higher concentration leads to a reduction in surface plate shape, a reduction in dispersibility, and the occurrence of agglomeration, leading to a reduction in mechanical properties. In example 8, since salicylic acid was not surface-treated, the interface strength was lowered, and the properties such as wet heat resistance and mechanical strength were lowered.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The processing technology of the lightweight 3D rear cover plate for the mobile phone is characterized in that: the method comprises the following steps:
s1: uniformly mixing a curing agent, a curing accelerator and a catalyst solvent to obtain a mixture A; uniformly mixing the mixture A with resin; adding the glass bead compound, and uniformly stirring to obtain a glue solution;
s2: arranging the glass fiber in a vertical gluing machine, coating glue solution, and drying to obtain a hollow glass bead layer;
s3: and cutting the hollow glass bead layer according to a model, overlapping the panel layers up and down, layering the hollow glass bead layer in a 45-degree direction, overlapping and then placing in a mold for pressing to obtain the lightweight 3D rear cover plate.
2. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 1, is characterized in that: the glue solution comprises the following raw materials: 300-350 parts of resin, 5-10 parts of curing agent, 0.3-0.6 part of curing accelerator, 370-430 parts of solvent, 70-120 parts of glass bead compound and 0.1-0.2 part of catalyst.
3. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 1, is characterized in that: the resin is one or more of phenolic resin, bisphenol A type epoxy resin and bisphenol F type epoxy resin; the curing agent is one or more of amine curing agent and anhydride curing agent; the curing accelerator is one or more of tertiary amine curing accelerators and imidazole curing accelerators; the solvent is one or more of acetone, butanone, dimethylformamide and propylene glycol methyl ether; the panel layer is an epoxy resin layer.
4. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 1, is characterized in that: in step S2, the coating speed of the gluing machine is 8-12 m/min, and the weight of the hollow glass bead layer is 1.4-2.4 g/dm 2 (ii) a In the step S3, in the pressing process, the pressure is 5-15 kgf/cm 2 The pressing temperature is 120-180 ℃, and the pressing time is 150-350 seconds.
5. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 1, is characterized in that: the preparation method of the glass bead compound comprises the following steps: ultrasonically dispersing hollow glass beads in a composite solution containing 3- (2, 3-epoxypropoxy) propyltrimethoxysilane and diphenyldichlorosilane, adding acetic acid to adjust the pH value to be 3.2-3.5, reacting for 2.5-3.5 hours, neutralizing by using sodium hydroxide, stirring for 40-60 minutes, washing and drying to obtain the glass bead composite.
6. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 5, is characterized in that: the solvent of the composite solution is ethanol, and the concentration of the solvent is 8-12 wt%; wherein the mass ratio of the 3- (2, 3-epoxypropoxy) propyl trimethoxy silane to the diphenyl dichlorosilane is 6 (3-4).
7. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 1, is characterized in that: in step S2, disposing glass fibers in a suspension containing AlN/Al nanoparticles, performing an immersion reaction, washing, and drying; transferring the mixture into salicylic acid solution, performing reflux reaction, washing and drying; and (5) placing the glass beads in a vertical gluing machine, coating glue solution, and drying to obtain the hollow glass bead layer.
8. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 7, is characterized in that: the concentration of AlN/Al nano particles in the suspension is 1-2 wt%; in the process of the dipping reaction, setting the heating rate to be 0.5-0.6 ℃/min, heating to 60-65 ℃, and reacting for 40-60 minutes; the preparation method of the AlN/Al nano particles comprises the following steps: and (2) placing the nano aluminum powder in a high-temperature nitriding furnace, introducing a hydrogen-nitrogen mixed gas (the hydrogen content is 5%), and calcining at 900-1100 ℃ for 10-12 hours to obtain the AlN/Al nano particles.
9. The machining process of the light-weight 3D rear cover plate for the mobile phone, according to claim 7, is characterized in that: the concentration of the salicylic acid solution is 5-6 wt%; the mass ratio of the salicylic acid to the AlN/Al nano particles is 1 (1.5-2); in the reflux reaction process, the heating temperature is 100-102 ℃, and the reflux time is 6-8 hours.
10. The lightweight 3D rear cover plate for the mobile phone, which is prepared by the processing technology of the lightweight 3D rear cover plate according to any one of claims 1 to 9.
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| CN108976716A (en) * | 2018-07-30 | 2018-12-11 | 界首市鑫龙机械设备购销有限公司 | A method of with hollow glass micropearl-carbon cloth-glass fibre preparation enhancing phenolic aldehyde-epoxy resin composite material |
| CN113308005A (en) * | 2021-05-28 | 2021-08-27 | 惠州市纵胜电子材料有限公司 | High-strength antistatic 3D sheet and preparation method thereof |
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| CN101638517A (en) * | 2009-09-10 | 2010-02-03 | 苏州大学 | Organosilicon resin composition |
| CN105153213A (en) * | 2015-09-17 | 2015-12-16 | 华南理工大学 | Method for preparing diphenyl silanediol |
| CN106113738A (en) * | 2016-07-15 | 2016-11-16 | 广东新秀新材料股份有限公司 | Sandwich structure composite material and preparation method thereof |
| CN108976716A (en) * | 2018-07-30 | 2018-12-11 | 界首市鑫龙机械设备购销有限公司 | A method of with hollow glass micropearl-carbon cloth-glass fibre preparation enhancing phenolic aldehyde-epoxy resin composite material |
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