CN115476552B - Preparation method of magnesium alloy high-strength sound-insulation composite board - Google Patents
Preparation method of magnesium alloy high-strength sound-insulation composite board Download PDFInfo
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- CN115476552B CN115476552B CN202211126439.XA CN202211126439A CN115476552B CN 115476552 B CN115476552 B CN 115476552B CN 202211126439 A CN202211126439 A CN 202211126439A CN 115476552 B CN115476552 B CN 115476552B
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 103
- 238000009413 insulation Methods 0.000 title claims abstract description 94
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 46
- 229920000742 Cotton Polymers 0.000 claims abstract description 62
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003822 epoxy resin Substances 0.000 claims abstract description 28
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 28
- 239000012943 hotmelt Substances 0.000 claims abstract description 18
- 238000005728 strengthening Methods 0.000 claims abstract description 10
- 239000002937 thermal insulation foam Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 42
- 239000000853 adhesive Substances 0.000 claims description 32
- 230000001070 adhesive effect Effects 0.000 claims description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000002253 acid Substances 0.000 claims description 24
- 239000003518 caustics Substances 0.000 claims description 24
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000007731 hot pressing Methods 0.000 claims description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 8
- 244000137852 Petrea volubilis Species 0.000 claims description 8
- 229920006231 aramid fiber Polymers 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 8
- 239000003365 glass fiber Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011777 magnesium Substances 0.000 abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 239000008281 solid sol Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 13
- 230000000630 rising effect Effects 0.000 description 12
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical group NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000011056 performance test Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004842 bisphenol F epoxy resin Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0076—Curing, vulcanising, cross-linking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a preparation method of a magnesium alloy high-strength sound-insulation composite board, and belongs to the technical field of high-quality magnesium material manufacturing. According to the invention, the sound insulation foam is filled in the honeycomb plate holes, so that the sound insulation of the plate is improved. Meanwhile, the two sides of the honeycomb plate are provided with the soundproof cotton subjected to strengthening treatment, so that the soundproof property and the strength performance of the plate are improved together. Finally, the hot-melt epoxy resin solid sol is used, the temperature and the pressure are programmed to be cured, the close combination with the sound insulation layer nano silica sol and the fiber is realized, and the bonding strength and the stability are improved, so that the overall strength performance of the plate is improved. The composite magnesium alloy honeycomb plate obtained by the preparation method has the properties of high strength, light weight, sound insulation, noise prevention and corrosion resistance, is suitable for being used in occasions such as aerospace, light weight high-speed trains and the like, realizes high-efficiency shock absorption and noise resistance, and has wide market application prospect.
Description
Technical Field
The invention belongs to the technical field of high-quality magnesium material manufacturing, and particularly relates to a preparation method of a magnesium alloy high-strength sound insulation composite board.
Background
Honeycomb panels are widely used in the fields of aircraft, trains, ships, buildings and the like due to a series of advantages of light weight, high strength, high rigidity, good stability, heat insulation, sound insulation and the like. The light weight, high performance, safety, environmental protection and energy saving are the necessary trend of the development of transportation means, and further, the honeycomb plate is provided with higher updating requirements.
In the existing train internal structure of the motor train unit, the components such as the floor, the wall plate, the roof plate and the like are basically all aluminum alloy honeycomb plates. Aluminum honeycomb panel is the perk of current high strength lightweight structure, has density little (be less than most timber density), compressive strength, bending strength height, characteristics such as sound insulation performance are good. The product is specially used for enterprises of rail trains in China, and has been developed rapidly in recent years, and enterprises with billions of production values are nearly ten. However, due to the running specificity of the motor train unit and the technical progress of the process characteristics, the noise in the motor train unit is generally higher when the aluminum honeycomb panel is applied, and particularly, the noise in the motor train unit at 350 km/h becomes an outstanding problem affecting the comfort level of passengers. Therefore, a structure is required to meet the requirement of light weight and have high sound insulation performance.
The density of the magnesium alloy is 1.75-1.85g/cm 2 And corresponds to 2/3 of that of aluminum. Since the specific strength of magnesium alloy is also higher than that of aluminum alloy and iron. Therefore, the weight of the parts can be reduced without reducing the strength, and the material is an undisputed lightweight engineering material. The magnesium alloy has good electromagnetic shielding performance and damping vibration attenuation. The vibration damping capacity is 5-100 times higher than that of aluminum alloy and thousands of times higher than that of steel; good casting performance. The fluidity of the liquid magnesium alloy is superior to that of aluminum alloy, and the liquid magnesium alloy is suitable for casting complex parts and large-size parts. The magnesium alloy has good machinability, low machining cost and machining energy of only 70% of that of the aluminum alloy.
However, the existing magnesium alloy honeycomb panel has insufficient sound insulation performance and strength performance, is not corrosion-resistant, and is greatly limited in practical application.
Disclosure of Invention
Aiming at the defects of the magnesium alloy honeycomb plate in the prior art, the invention provides the novel multilayer magnesium honeycomb sound insulation plate, which greatly improves the sound insulation performance and the strength performance of the sound insulation plate, improves the corrosion resistance and prolongs the service life.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb plate, preprocessing, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
Further, the surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
Further, the pretreatment process in the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 30-50%, the temperature of caustic washing is 60-80 ℃, and the time of caustic washing is 10-15min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 10-20%, wherein the acid washing temperature is 20-40 ℃, and the acid washing time is 5-10min; finally, an aluminum sulfate solution with the mass concentration of 20-40% is used, the pH value is regulated to 8-10, and the soaking time is 15-20 minutes at room temperature, so that the pretreatment process is completed.
Further, the sound insulation balls in the step (2) are sound insulation foam or sound insulation cotton.
Further, the adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent, wherein the mass ratio is 4-5:1, and the adhesive is mixed, heated and melted for use in the use process, and the dosage is 50+/-10 g/m 2 。
Further, the hot melt epoxy resin is bisphenol A epoxy resin or bisphenol F epoxy resin; the curing agent is dicyandiamide.
Further, the soundproof cotton in the step (2) is used after being subjected to strengthening treatment, and the specific process is as follows: uniformly dispersing aramid fiber and glass fiber in alkaline silica sol according to a mass ratio of 1:1, wherein the solid-liquid ratio is 1g:15-20mL, uniformly mixing to obtain fibrous silica sol, uniformly coating the fibrous silica sol on the surface of the soundproof cotton, wherein the coating dosage is 100-200g/m 2 And (5) fully drying after coating.
The invention is used after the commercial soundproof cotton is treated, firstly, the tough aramid fiber and the hard glass fiber are dispersed in the nano silica sol, the nano silica sol is coated in the soundproof cotton, the nano particles of small particles interact with the fiber, and the nano particles can be fully combined with the binder to form a hard and compact gel structure in the subsequent heating and curing process of the epoxy resin, so that the soundproof performance and the strength performance of the material are greatly improved without increasing the weight of the system.
Further, the silicon dioxide content of the alkaline silica sol is not less than 30%, the pH is 9.0-10.0, and the particle size is 10-20nm.
Further, the temperature programming hot pressing method in the step (4) is that the temperature is raised according to the temperature rising rate of 1-2 ℃/min, the temperature is raised to 40-50 ℃ for 10-15min, then the temperature is raised to 80-100 ℃ at the temperature rising rate of 1-2 ℃/min, the curing is carried out for 1h, the pressure is simultaneously increased to 0.1-0.3MPa, and the natural cooling is finished after the curing.
The raw material plates of each layer of the invention are commercial plates, and the raw materials used in the preparation process are commercially available.
The naturally formed oxide film on the surface of the magnesium alloy is loose and porous, so that the corrosion resistance of the magnesium alloy is seriously reduced.
According to the invention, the sound insulation foam is filled in the honeycomb plate holes, so that the sound insulation of the plate is improved. Meanwhile, the two sides of the honeycomb plate are provided with the soundproof cotton subjected to strengthening treatment, so that the soundproof property and the strength performance of the plate are improved together. Finally, the hot-melt epoxy resin solid sol is used, the temperature and the pressure are programmed to be cured, the close combination with the sound insulation layer nano silica sol and the fiber is realized, and the bonding strength and the stability are improved, so that the overall strength performance of the plate is improved.
Advantageous effects
The composite magnesium alloy honeycomb plate obtained by the preparation method has the properties of high strength, light weight, sound insulation, noise prevention and corrosion resistance, is suitable for being used in occasions such as aerospace, light weight high-speed trains and the like, realizes high-efficiency shock absorption and noise resistance, and has wide market application prospect.
Drawings
FIG. 1 is a schematic view of the structure of a plate layer according to the present invention.
Detailed Description
The technical scheme of the present invention is further described below with reference to specific examples, but is not limited thereto.
Example 1
The preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb laminate, pretreating, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
The surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
The pretreatment process of the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 30 percent, the temperature of the caustic washing is 60 ℃, and the time of the caustic washing is 10 minutes; then carrying out acid washing by using a nitric acid solution with the mass concentration of 10%, wherein the acid washing temperature is 20 ℃, and the acid washing time is 5min; finally, an aluminum sulfate solution with the mass concentration of 20% is used, the pH value is regulated to 8-10, and the soaking time is 15 minutes at room temperature, so that the pretreatment process is completed.
And (3) the sound insulation balls in the step (2) are sound insulation foam.
The adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 4:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 。
The hot melt epoxy resin is bisphenol A epoxy resin; the curing agent is dicyandiamide.
The soundproof cotton in the step (2) is used after strengthening treatment, and the specific process is as follows: uniformly dispersing aramid fiber and glass fiber in alkaline silica sol according to a mass ratio of 1:1, wherein the solid-liquid ratio is 1g:15mL, uniformly mixing to obtain fibrous silica sol, uniformly coating the fibrous silica sol on the surface of the soundproof cotton, wherein the coating amount is 100g/m 2 And (5) fully drying after coating.
The silicon dioxide content of the alkaline silica sol is not less than 30%, the pH value is 9.0-10.0, and the particle size is 10-20nm.
The temperature programming hot pressing method in the step (4) is that the temperature is raised according to the temperature rising rate of 1-2 ℃/min, the temperature is raised to 40-50 ℃ for 10-15min, then the temperature is raised to 80-100 ℃ at the temperature rising rate of 1-2 ℃/min, the curing is carried out for 1h, the pressure is 0.1MPa, and the curing is finished and the temperature is naturally lowered.
Example 2
The preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb laminate, pretreating, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
The surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
The pretreatment process of the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 40%, the temperature of the caustic washing is 70 ℃, and the time of the caustic washing is 10min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 15%, wherein the acid washing temperature is 30 ℃, and the acid washing time is 5min; finally, using 30% aluminum sulfate solution with mass concentration, adjusting pH to 8-10, soaking for 15 minutes at room temperature, and finishing the pretreatment process.
And (2) the sound insulation balls are sound insulation cotton.
The adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 5:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 。
The hot melt epoxy resin is bisphenol F epoxy resin; the curing agent is dicyandiamide.
The soundproof cotton in the step (2) is subjected to strengthening treatment and then is made intoThe method comprises the following specific processes: uniformly dispersing aramid fiber and glass fiber in alkaline silica sol according to a mass ratio of 1:1, wherein the solid-liquid ratio is 1g:15mL, uniformly mixing to obtain fibrous silica sol, uniformly coating the fibrous silica sol on the surface of the soundproof cotton, wherein the coating dosage is 150g/m 2 And (5) fully drying after coating.
The silicon dioxide content of the alkaline silica sol is not less than 30%, the pH value is 9.0-10.0, and the particle size is 10-20nm.
The temperature programming hot pressing method in the step (4) is that the temperature is raised according to the temperature rising rate of 1-2 ℃/min, the temperature is raised to 40-50 ℃ for 10-15min, then the temperature is raised to 80-100 ℃ at the temperature rising rate of 1-2 ℃/min, the curing is carried out for 1h, the pressure is simultaneously increased to 0.1-0.3MPa, and the natural cooling is finished after the curing.
Example 3
The preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb laminate, pretreating, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
The surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
The pretreatment process of the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 50%, the temperature of the caustic washing is 80 ℃, and the time of the caustic washing is 15min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 20%, wherein the acid washing temperature is 40 ℃, and the acid washing time is 10min; finally, an aluminum sulfate solution with the mass concentration of 40% is used, the pH value is regulated to 8-10, and the soaking time is 20 minutes at room temperature, so that the pretreatment process is completed.
And (3) the sound insulation balls in the step (2) are sound insulation foam.
The adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 5:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 。
The hot melt epoxy resin is bisphenol A epoxy resin; the curing agent is dicyandiamide.
The soundproof cotton in the step (2) is used after strengthening treatment, and the specific process is as follows: uniformly dispersing aramid fiber and glass fiber in alkaline silica sol according to a mass ratio of 1:1, wherein the solid-liquid ratio is 1g:20mL, uniformly mixing to obtain fibrous silica sol, uniformly coating the fibrous silica sol on the surface of the soundproof cotton, wherein the coating dosage is 200g/m 2 And (5) fully drying after coating.
The silicon dioxide content of the alkaline silica sol is not less than 30%, the pH value is 9.0-10.0, and the particle size is 10-20nm.
The temperature programming hot pressing method in the step (4) is that the temperature is raised according to the temperature rising rate of 1-2 ℃/min, the temperature is raised to 40-50 ℃ for 10-15min, then the temperature is raised to 80-100 ℃ at the temperature rising rate of 1-2 ℃/min, the curing is carried out for 1h, the pressure is simultaneously increased to 0.1-0.3MPa, and the natural cooling is finished after the curing.
Comparative example 1
The preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(4) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb laminate, pretreating, and naturally airing for later use;
(5) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(6) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
The surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
The pretreatment process of the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 50%, the temperature of the caustic washing is 80 ℃, and the time of the caustic washing is 15min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 20%, wherein the acid washing temperature is 40 ℃, and the acid washing time is 10min; finally, an aluminum sulfate solution with the mass concentration of 40% is used, the pH value is regulated to 8-10, and the soaking time is 20 minutes at room temperature, so that the pretreatment process is completed.
And (3) the sound insulation balls in the step (2) are sound insulation foam.
The adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 5:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 。
The hot melt epoxy resin is bisphenol A epoxy resin; the curing agent is dicyandiamide.
The soundproof cotton in the step (2) is directly commercially available soundproof cotton.
The temperature programming hot pressing method in the step (4) is that the temperature is raised according to the temperature rising rate of 1-2 ℃/min, the temperature is raised to 40-50 ℃ for 10-15min, then the temperature is raised to 80-100 ℃ at the temperature rising rate of 1-2 ℃/min, the curing is carried out for 1h, the pressure is simultaneously increased to 0.1-0.3MPa, and the natural cooling is finished after the curing.
The comparative example was prepared in the same manner as in example 3, except that the reinforcing treatment of the soundproof cotton was not performed.
Comparative example 2
The preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb laminate, pretreating, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
The surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
The pretreatment process of the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 50%, the temperature of the caustic washing is 80 ℃, and the time of the caustic washing is 15min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 20%, wherein the acid washing temperature is 40 ℃, and the acid washing time is 10min; finally, an aluminum sulfate solution with the mass concentration of 40% is used, the pH value is regulated to 8-10, and the soaking time is 20 minutes at room temperature, so that the pretreatment process is completed.
And (3) the sound insulation balls in the step (2) are sound insulation foam.
The adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 5:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 。
The hot melt epoxy resin is bisphenol A epoxy resin; the curing agent is dicyandiamide.
The soundproof cotton in the step (2) is used after strengthening treatment, and the specific process is as follows: uniformly coating alkaline silica sol on the surface of soundproof cotton, wherein the coating dosage is 200g/m 2 And (5) fully drying after coating.
The silicon dioxide content of the alkaline silica sol is not less than 30%, the pH value is 9.0-10.0, and the particle size is 10-20nm.
The temperature programming hot pressing method in the step (4) is that the temperature is raised according to the temperature rising rate of 1-2 ℃/min, the temperature is raised to 40-50 ℃ for 10-15min, then the temperature is raised to 80-100 ℃ at the temperature rising rate of 1-2 ℃/min, the curing is carried out for 1h, the pressure is simultaneously increased to 0.1-0.3MPa, and the natural cooling is finished after the curing.
This comparative example was prepared in the same manner as in example 3, except that only alkaline silica sol was used for the reinforcing treatment of soundproof cotton.
Comparative example 3
The preparation method of the magnesium alloy high-strength sound insulation composite board comprises the following steps of: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps: the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb laminate, pretreating, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) And (3) carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to enable the adhesive to be solidified, so as to obtain the sound insulation composite board, and cutting the sound insulation composite board according to the requirement in actual use.
The surface cleaning in the step (1) is to polish the surface by fine sand paper and clean the surface by acetone.
The pretreatment process of the step (1) comprises the following steps: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 50%, the temperature of the caustic washing is 80 ℃, and the time of the caustic washing is 15min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 20%, wherein the acid washing temperature is 40 ℃, and the acid washing time is 10min; finally, an aluminum sulfate solution with the mass concentration of 40% is used, the pH value is regulated to 8-10, and the soaking time is 20 minutes at room temperature, so that the pretreatment process is completed.
And (3) the sound insulation balls in the step (2) are sound insulation foam.
The adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 5:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 。
The hot melt epoxy resin is bisphenol A epoxy resin; the curing agent is dicyandiamide.
The soundproof cotton in the step (2) is used after strengthening treatment, and the specific process is as follows: uniformly dispersing aramid fiber and glass fiber in alkaline silica sol according to a mass ratio of 1:1, wherein the solid-liquid ratio is 1g:20mL, uniformly mixing to obtain fibrous silica sol, uniformly coating the fibrous silica sol on the surface of the soundproof cotton, wherein the coating dosage is 200g/m 2 And (5) fully drying after coating.
The silicon dioxide content of the alkaline silica sol is not less than 30%, the pH value is 9.0-10.0, and the particle size is 10-20nm.
The temperature programming hot pressing method in the step (4) is to heat to 80-100 ℃ according to the heating rate of 1-2 ℃/min for curing for 1h, and simultaneously pressurizing at the pressure of 0.1-0.3MPa, and naturally cooling after curing.
The comparative example was prepared in the same manner as in example 3, except that the heat preservation at 40 to 50℃was not performed in the heating and hot pressing.
Comparative example 4
The comparative example was prepared in the same manner as in example 3, except that the temperature was increased at a heating rate of 4℃per minute in the heating hot press.
Test panel performance test
The sheets obtained in examples 1 to 3 and comparative examples 1 to 4 of the present invention were subjected to performance test, and the magnesium alloy sheet used in each test group had a thickness of 1.0mm, a honeycomb magnesium alloy thickness of 0.04mm, a honeycomb core height of 10mm and a soundproof cotton thickness of 3mm. The specific test method is as follows:
the performance of the honeycomb sandwich structure test plate is tested according to national standards, and the roller stripping performance is tested according to GB/T1457-2005 Sandwich structure roller stripping strength test method. The shear performance and bending performance were tested according to GB/T1455-2005 method for testing Sandwich Structure or core shear Performance and GB/T1456-2005 method for testing Sandwich Structure bending Performance, respectively. The bonding quality of the honeycomb sandwich structure is tested according to GB/T34886-2017 'nondestructive testing composite material laser dislocation speckle detection method'. Sound insulation performance test, namely testing sound insulation performance of the honeycomb panel in a semi-anechoic room by adopting an SQLabII double-channel acoustic analyzer, and the sound absorption coefficient: reference standard GB 50088-1985T. High temperature stability: the examples/comparative examples were heated to 60℃and held for 3 hours, and their dimensional change rates in the transverse and longitudinal directions were measured; the test results are shown in table 1:
TABLE 1 Performance test results
As can be seen from the data in the table, the composite board provided by the embodiment of the invention has better strength performance and sound insulation performance, the corrosion resistance of the material is improved by the pretreatment in the early stage, and the compactness of the material is greatly improved by adding silica sol, glass fiber and aramid fiber in the treatment of the sound insulation cotton, so that the sound absorption and sound insulation performance of the material is enhanced, and meanwhile, in the slow temperature programming and curing process of the hot melt type epoxy resin, the fiber material is connected with the nano silica sol and the epoxy resin, so that the sufficient combination is realized, and the bonding force of the sound insulation cotton and the honeycomb board, the sound insulation cotton and the outer magnesium alloy board is further enhanced, so that the strength and the sound insulation performance are improved. And comparative example 1 without strengthening treatment, comparative example 2 without adding fiber, and comparative examples 3 to 4 with the temperature programming process changed, the resulting boards all exhibited a different degree of deterioration in overall properties. The invention is a key technical innovation for realizing the preparation of the high-performance magnesium alloy honeycomb plate for the modification and temperature programming process of the soundproof cotton, and the two are matched with each other, so that the effect is weak.
It should be noted that the above-mentioned embodiments are merely some, but not all embodiments of the preferred mode of carrying out the invention. It is evident that all other embodiments obtained by a person skilled in the art without making any inventive effort, based on the above-described embodiments of the invention, shall fall within the scope of protection of the invention.
Claims (3)
1. The preparation method of the magnesium alloy high-strength sound insulation composite board is characterized in that the composite board is divided into five layers from top to bottom, wherein the five layers are respectively as follows: (1) an outermost magnesium alloy plate, (2) an intermediate layer soundproof cotton, (3) an innermost magnesium alloy honeycomb plate, (4) an intermediate layer soundproof cotton, and (5) an outermost magnesium alloy plate; the preparation method comprises the following preparation steps:
(1) And (3) pretreatment of the plates: cleaning the surfaces of the magnesium alloy plate and the magnesium alloy honeycomb plate, preprocessing, and naturally airing for later use;
(2) Filling sound insulation balls in the magnesium alloy honeycomb plate honeycomb, spraying adhesives on two sides of the magnesium alloy honeycomb plate, bonding sound insulation cotton on two sides of the magnesium alloy honeycomb plate filled with the sound insulation balls, spraying adhesives again, and bonding the magnesium alloy plate on the outer side of the sound insulation cotton to obtain a prefabricated composite plate;
(3) Carrying out programmed heating and hot pressing on the prefabricated composite board of the laminated body obtained in the step (2) to solidify the binder, thereby obtaining the magnesium alloy high-strength sound insulation composite board, and cutting according to the requirement when in actual use;
the soundproof cotton in the step (2) is used after strengthening treatment, and the specific process is as follows: uniformly dispersing aramid fiber and glass fiber in alkaline silica sol according to a mass ratio of 1:1, wherein the solid-liquid ratio is 1g:15-20mL, uniformly mixing to obtain fibrous silica sol, uniformly coating the fibrous silica sol on the surface of the soundproof cotton, wherein the coating dosage is 100-200g/m 2 Fully drying after coating is finished;
the sound insulation balls in the step (2) are sound insulation foam or sound insulation cotton;
the adhesive in the step (2) is hot melt epoxy resin, and comprises epoxy resin and curing agent in a mass ratio of 4-5:1, and is used after being mixed, heated and melted in an amount of 50+/-10 g/m 2 ；
The temperature programming hot pressing method comprises the steps of heating according to a heating rate of 1-2 ℃/min, heating to 40-50 ℃ for 10-15min, heating to 80-100 ℃ at a heating rate of 1-2 ℃/min, solidifying for 1h, pressurizing at the same time, keeping the pressure at 0.1-0.3MPa, and naturally cooling after solidification;
the silicon dioxide content of the alkaline silica sol is not less than 30%, the pH value is 9.0-10.0, and the particle size is 10-20nm.
2. The method for preparing the magnesium alloy high-strength sound-insulation composite board according to claim 1, wherein the surface cleaning in the step (1) is to polish the surface by adopting fine sand paper and then clean the surface by using acetone.
3. The method for preparing the magnesium alloy high-strength sound-insulation composite board according to claim 1, wherein the pretreatment process in the step (1) is as follows: firstly, caustic washing is carried out by using sodium hydroxide with the mass concentration of 30-50%, the temperature of caustic washing is 60-80 ℃, and the time of caustic washing is 10-15min; then carrying out acid washing by using a nitric acid solution with the mass concentration of 10-20%, wherein the acid washing temperature is 20-40 ℃, and the acid washing time is 5-10min; finally, an aluminum sulfate solution with the mass concentration of 20-40% is used, the pH value is regulated to 8-10, the soaking time is 15-20 minutes at room temperature, and the aluminum sulfate solution is taken out and dried to finish the pretreatment process.
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Effective date of registration: 20231121 Address after: 276000 500 meters west of Baibu Village, Dongmeng Town, Fei County, Linyi City, Shandong Province Patentee after: Shandong Tianmagnesium New Materials Technology Co.,Ltd. Address before: 276000 500 meters west of Baibu Village, Dongmeng Town, Fei County, Linyi City, Shandong Province Patentee before: Shandong Tianyuan Heavy Industry Co.,Ltd. |