Thermal insulation composite decorative aluminum plate and preparation method thereof

Abstract

The application relates to the field of heat preservation aluminum plates, and particularly discloses a heat preservation composite decorative aluminum plate and a preparation method thereof, wherein the heat preservation composite decorative aluminum plate comprises, from top to bottom, an inner lining plate, a heat preservation layer and a decorative aluminum plate, and the heat preservation layer is a magnesium hydroxide-coated silica / polystyrene foaming compound. The heat preservation layer of the heat preservation composite decorative aluminum plate is adjusted to be the magnesium hydroxide-coated silica / polystyrene foaming compound, the raw material content and the preparation process in the preparation process are adjusted, and the preparation process of the heat preservation composite decorative aluminum plate is combined, so that the heat conduction coefficient of the obtained heat preservation composite decorative aluminum plate is at least 0.0150 W / (m*K), and the heat preservation performance is excellent.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of thermal insulation aluminum plates, in particular to a thermal insulation composite decorative aluminum plate and a preparation method thereof. BACKGROUND

[0002] The decorative aluminum plate is a building material, which uses an aluminum alloy plate as a surface material, has good weather resistance and corrosion resistance, has a long service life, has good decorative effects, and is suitable for different building styles. After being combined with a thermal insulation material, the decorative aluminum plate has thermal insulation and decoration functions, thereby maintaining indoor temperature and reducing energy loss. The decorative aluminum plate is widely applied to the thermal insulation and decoration of outer walls of modern buildings, and is particularly suitable for occasions requiring good appearance and thermal insulation performance, such as commercial buildings, office buildings, residences and public facilities.

[0003] In the related art, thermal insulation mortar and foamed glass are usually used as thermal insulation materials, but the thermal conductivity of the thermal insulation mortar is relatively high; the foamed glass is prone to falling off and has a high cost, which affects the actual application. SUMMARY

[0004] In order to improve the thermal insulation performance of the decorative aluminum plate, the application provides a thermal insulation composite decorative aluminum plate and a preparation method thereof.

[0005] In a first aspect, the application provides a thermal insulation composite decorative aluminum plate, which adopts the following technical scheme:

[0006] The thermal insulation composite decorative aluminum plate comprises an inner lining plate, a thermal insulation layer and a decorative aluminum plate arranged in sequence from top to bottom, and the thermal insulation layer is a magnesium hydroxide-coated silica / polystyrene foam composite.

[0007] By adopting the above technical scheme, the decorative aluminum plate of the thermal insulation composite decorative aluminum plate is an appearance surface layer, which mainly provides an attractive appearance and surface protection.

[0008] The thermal insulation layer, that is, the intermediate layer, is the core of the whole structure, and the magnesium hydroxide-coated silica / polystyrene foam composite is used. The composite material combines the low thermal conductivity of the polystyrene foam material and the good thermal insulation performance of the silica, and forms a material with excellent thermal insulation effect.

[0009] Firstly, the thermal conductivity of magnesium hydroxide is relatively low, which can well slow down heat transfer; and the thermal decomposition temperature of magnesium hydroxide is about 340 DEG C. Before this temperature, magnesium hydroxide well maintains its structure and thermal insulation performance. When the temperature reaches above the decomposition temperature, magnesium hydroxide will decompose and release water vapor, absorb a large amount of heat, reduce the temperature of the material and block oxygen. Meanwhile, magnesium hydroxide is an environmentally friendly material, which is non-toxic and harmless, and will not release toxic gases during decomposition, so it is a good thermal insulation material.

[0010] Secondly, the thermal conductivity coefficient of silicon dioxide is very low, so it can effectively slow down the conduction speed of heat and play a role in heat preservation. Silicon dioxide has a very high melting point and thermal stability, and can maintain stable heat preservation performance at high temperature. Silicon dioxide is not easy to be eroded by chemicals and can maintain good heat preservation performance in harsh environments. The low density of silicon dioxide makes it a lightweight thermal insulation material, and the large specific surface area provides a rich reaction space for the preparation of magnesium hydroxide coated silicon dioxide / polystyrene foam composite.

[0011] In addition, polystyrene foam material has low thermal conductivity, which can effectively slow down the conduction speed of heat and provide good heat preservation effect. It also has excellent thermal insulation performance, which can effectively isolate the temperature difference between indoor and outdoor, and reduce energy loss. EPS foam material is not easy to be eroded by chemicals and has good corrosion resistance. EPS foam material has low density, making it a lightweight thermal insulation material, which is conducive to the installation of buildings. EPS foam material has good stability and is not easy to be damp, aged or decomposed, maintaining long-term heat preservation performance. Importantly, the surface area of polystyrene (EPS) foam material is usually relatively large due to its porous structure, which provides more surface area for magnesium hydroxide coated silicon dioxide / polystyrene foam composite, helping to increase the contact area with magnesium hydroxide coated silicon dioxide, so that it is well fixed and stable, thereby improving the composite effect.

[0012] In summary, combining the heat preservation and surface area advantages of magnesium hydroxide, silicon dioxide and polystyrene foam material, magnesium hydroxide is coated on the surface of silicon dioxide, and then compounded with polystyrene foam material to form a multi-layer structure, so that the gap and thermal insulation layer between different material layers can reduce heat conduction, thereby improving the heat preservation performance. At the same time, both magnesium hydroxide and silicon dioxide have radiation reflection and heat storage performance, which can not only reduce the transmission of heat radiation and reduce heat loss, but also absorb and store heat, thereby slowing down the temperature change, so that the heat preservation layer provides excellent heat preservation effect.

[0013] As a preferred: the magnesium hydroxide coated silicon dioxide / polystyrene foam composite includes the following raw materials: 15-25 parts of silicon dioxide, 100-200 parts of 2-4 wt% NaOH aqueous solution, 200-400 parts of 7-9 wt% MgCl2 aqueous solution, 50-120 parts of 6-7 wt% NaOH aqueous solution, 80-100 parts of polystyrene, 1-5 parts of foaming agent, 1-5 parts of curing agent, and 0.1-1 parts of plasticizer, based on the weight of the magnesium hydroxide coated silicon dioxide / polystyrene foam composite.

[0014] The magnesium hydroxide coated silica / polystyrene foaming composite of the present application can use any value within the respective ranges of 15-25 parts of silica, 100-200 parts of 2-4 wt% NaOH aqueous solution, 200-400 parts of 7-9 wt% MgCl2 aqueous solution, 50-120 parts of 6-7 wt% NaOH aqueous solution, 80-100 parts of polystyrene, 1-5 parts of foaming agent, and 1-5 parts of curing agent, and 0.1-1 part of plasticizer, and can improve the compounding effect of the magnesium hydroxide coated silica / polystyrene foaming composite.

[0015] Preferably, the magnesium hydroxide coated silica / polystyrene foaming composite is prepared by the following operation steps:

[0016] S1, stirring 2-4 wt% NaOH aqueous solution and silica at 60-90°C for 1.5-2.5 h, then filtering to obtain a filter cake, washing and drying the filter cake to obtain pretreated hollow silica;

[0017] S2, mixing the pretreated silica obtained in S1 with 7-9 wt% MgCl2 aqueous solution and stirring for 0.5-1.5 h, then adding 6-7 wt% NaOH aqueous solution and stirring for 1-3 h, then washing and filtering to obtain a filter cake, then drying and crushing the filter cake to obtain hollow silica-Mg(OH)2 powder.

[0018] S3, mixing polystyrene, foaming agent, and silica-Mg(OH)2 powder obtained in S2, curing agent, and plasticizer and stirring for 1-5 h, then drying to obtain hollow magnesium hydroxide coated silica / polystyrene foaming composite.

[0019] By adopting the above technical solution, S1: the stirring reaction of NaOH aqueous solution and silica is mainly for surface treatment of silica to make its surface hydrophilic and form a pretreatment film of silicon hydroxide to increase the surface activity, which is beneficial to the subsequent mixing reaction with MgCl2 aqueous solution.

[0020] S2: the mixing reaction of MgCl2 aqueous solution and pretreated silica is mainly for chemical reaction of MgCl2 with the surface of silica to generate Mg(OH)2, and then through the addition of NaOH aqueous solution, Mg(OH)2 is further coated on the surface of silica.

[0021] S3: polystyrene, foaming agent, curing agent, plasticizer and the obtained silica-Mg(OH)2 powder in S2 are mixed and reacted mainly to form a hollow magnesium hydroxide coated silica / polystyrene composite foaming compound, wherein the foaming agent is used to release gas in the foaming process, the plasticizer is used to improve the flexibility of the material, and the curing agent is used to improve the hardness and stability of the material. Through this step, the obtained composite foaming compound has the structure of hollow magnesium hydroxide coated silica / polystyrene, and has excellent thermal insulation performance and mechanical properties.

[0022] As a preferred: the S3 further comprises a pretreatment step before polystyrene foaming.

[0023] As a preferred: the pretreatment is: after mixing polystyrene and foaming agent and pre-foaming at 0.1-1 MPa, 80-100℃, drying at 50-90℃ for 8-12h.

[0024] By adopting the above technical solution, polystyrene and foaming agent are mixed and pre-foamed at a pressure of 0.1-1 MPa and a temperature of 80-100℃, mainly to promote the decomposition and release of the foaming agent by high temperature and pressure, so as to form a pore structure in the polystyrene. Then dry at 50-90℃, in order to remove the residual solvent and moisture, so that the foaming material is more stable, through the pretreatment step, a uniform pore structure can be formed in the polystyrene, and the foaming performance and absorption capacity of the polystyrene are improved. In addition, the drying process can remove excess solvent and moisture, so that the material is more stable, and the treated polystyrene is more suitable for preparing composite foaming material, thereby improving the composite effect of the magnesium hydroxide coated silica / polystyrene foaming compound.

[0025] As a preferred: the weight ratio of silica and polystyrene is 1:(3.4-3.8).

[0026] By adopting the above technical solution, the weight ratio of silica and polystyrene is adjusted to 1:(3.4-3.8), which can further reduce the heat conduction between different material layers and the heat insulation layer, thereby improving the thermal insulation performance.

[0027] As a preferred: the silica is at least one of hollow silica or silica coated ammonium polyphosphate.

[0028] By adopting the above technical scheme, when the silicon dioxide is hollow silicon dioxide, the hollow structure inside the hollow silicon dioxide can be utilized to increase the thermal resistance of the magnesium hydroxide coated silicon dioxide / polystyrene foaming composite; further reduce the heat conduction; when the silicon dioxide is silicon dioxide coated ammonium polyphosphate, because the heat conduction coefficient of the ammonium polyphosphate is smaller, the thermal resistance of the magnesium hydroxide coated silicon dioxide / polystyrene foaming composite can also be increased, and a good heat insulation effect is provided. Therefore, either one of the two or a mixture of the two added to the foaming composite can improve the heat preservation performance of the magnesium hydroxide coated silicon dioxide / polystyrene foaming composite.

[0029] In a second aspect, the application provides a preparation method of the heat preservation composite decorative aluminum plate.

[0030] A preparation method of a heat preservation composite decorative aluminum plate, comprising the following steps:

[0031] S1, forming the magnesium hydroxide coated silicon dioxide / polystyrene composite at 90-100 DEG C, injecting steam into the mold, discharging the steam under a pressure of 0.1-0.2 MPa and cooling, and demolding to obtain a magnesium hydroxide coated silicon dioxide / polystyrene composite heat preservation layer plate;

[0032] S2, placing the inner lining plate, the heat preservation layer plate and the decorative aluminum plate from top to bottom in sequence, and coating a layer of adhesive between each plate to obtain a composite layer plate.

[0033] By adopting the above technical scheme, the magnesium hydroxide coated silicon dioxide / polystyrene composite in the S1 step is formed at high temperature, mainly through the softening and flow of the thermoplastic material to fill the mold and form the required shape. Steam is injected into the mold at the same time, and the heat of the steam makes the material soften and expand, which is beneficial to filling the fine structure of the mold. Under a certain pressure, the steam is discharged and cooled, so that the composite material can be solidified and maintain the required shape. The magnesium hydroxide coated silicon dioxide / polystyrene composite heat preservation layer plate obtained by demolding has certain strength and shape stability.

[0034] In the S2 step, the inner lining plate, the heat preservation layer plate and the decorative aluminum plate are stacked and combined, and an integrated composite layer plate is formed by coating the adhesive, and the decorative aluminum plate of the heat preservation composite decorative aluminum plate obtained has a heat preservation layer, and the inner lining plate can provide structural support and connection performance, and the whole has good strength and stability, realizing the integration of heat preservation and decoration, and ensuring the strength and stability of the structure.

[0035] In summary, the application includes at least one of the following beneficial technical effects:

[0036] The application adjusts the heat preservation layer of the heat preservation composite decorative aluminum plate to be magnesium hydroxide coated silica / polystyrene foaming compound, adjusts the raw material content and preparation process in the preparation process, and combines the preparation process of the heat preservation composite decorative aluminum plate, so that the heat conductivity coefficient of the obtained heat preservation composite decorative aluminum plate is as low as 0.0150 W / (m·K), and the heat preservation performance is excellent. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The following is a flow chart of the preparation method provided by the application. DETAILED DESCRIPTION

[0038] The application will be further described in detail below in combination with specific examples.

[0039] The following raw materials in the application are all commercially available products, and the disclosure of the raw materials should not be understood as limiting the source of the raw materials.

[0040] The silica coated ammonium polyphosphate in the application is prepared by the following preparation method:

[0041] 60g of ammonium polyphosphate and 0.5g of OP-10 emulsifier are added into a water and ethanol mixed solution at 55℃, and the pH value of the system is adjusted to 9 with ammonia water, then 40g of tetraethyl orthosilicate is added dropwise and reacted for 1h, the filter cake is washed with deionized water and anhydrous ethanol, and dried in a 80℃ drying oven for 24h to obtain the silica coated ammonium polyphosphate.

[0042] The reagents used in the application are as follows: tetraethyl orthosilicate, content 40%, industrial grade; ammonium polyphosphate, content 99%, industrial grade; ethanol, content 99.9%, industrial grade; ammonia water, active ingredient content 28%, industrial grade; NaOH, content 99%, industrial grade; silica, content 99%, analytical pure; hollow silica, content 99%, analytical pure; MgCl2, content 99%, industrial grade; Mg(OH)2, content 99.9%, industrial grade; polystyrene, active ingredient content 33%, standard grade; foaming agent selected as isopentane, content 99%, industrial grade; curing agent selected as isocyanate, active ingredient content 99.8%; plasticizer selected as isooctanol, content 99.9%, industrial grade; adhesive selected as model WJ-501.

[0043] The following is a preparation example of the magnesium hydroxide coated silica / polystyrene foaming compound

[0044] Preparation Example 1

[0045] The magnesium hydroxide coated silica / polystyrene foaming compound of Preparation Example 1 is prepared by the following operation steps:

[0046] S1, 100 g of 3 wt% NaOH aqueous solution was stirred with 15 g of silica at 60 °C for 2 h, and then filtered to obtain a filter cake, the filter cake was washed with deionized water three times, and dried at 80 °C for 10 h to obtain a pretreated silica;

[0047] S2, the pretreated silica obtained from S1 was mixed with 8 wt% of 400 g of MgCl2 aqueous solution and stirred for 1 h, then 120 g of 6 wt% NaOH aqueous solution was added and stirred for 2 h, then washed with ethanol and deionized water respectively and filtered to obtain a filter cake, then the filter cake was dried at 80 °C for 10 h, and after crushing, a silica-Mg(OH)2 powder was obtained.

[0048] S3, 80 g of polystyrene, 1 g of foaming agent, and the silica-Mg(OH)2 powder obtained from S2, 1 g of curing agent, and 0.1 g of plasticizer were uniformly mixed and stirred for 1 h, and then dried to obtain a hollow magnesium hydroxide coated silica / polystyrene composite foaming composite.

[0049] Preparation Example 2

[0050] The magnesium hydroxide coated silica / polystyrene foaming composite of Preparation Example 2 was prepared by the following operation steps:

[0051] S1, 200 g of 3 wt% NaOH aqueous solution was stirred with 20 g of silica at 90 °C for 2 h, and then filtered to obtain a filter cake, the filter cake was washed with deionized water three times, and dried at 80 °C for 10 h to obtain a pretreated silica;

[0052] S2, the pretreated silica obtained from S1 was mixed with 8 wt% of 200 g of MgCl2 aqueous solution and stirred for 1 h, then 50 g of 6 wt% NaOH aqueous solution was added and stirred for 2 h, then washed with ethanol and deionized water respectively and filtered to obtain a filter cake, then the filter cake was dried at 80 °C for 10 h, and after crushing, a silica-Mg(OH)2 powder was obtained.

[0053] S3, 100 g of polystyrene, 5 g of foaming agent, and the silica-Mg(OH)2 powder obtained from S2, 5 g of curing agent, and 1 g of plasticizer were uniformly mixed and stirred for 1 h, and then dried to obtain a hollow magnesium hydroxide coated silica / polystyrene composite foaming composite.

[0054] Preparation Example 3

[0055] The magnesium hydroxide coated silica / polystyrene foaming composite of Preparation Example 3 was prepared by the following operation steps:

[0056] S1, 150 g of 3 wt% NaOH aqueous solution was stirred with 25 g of silica at 75 °C for 2 h, and then filtered to obtain a filter cake, which was washed with deionized water for three times and dried at 80 °C for 10 h to obtain pretreated silica;

[0057] S2, the pretreated silica obtained in S1 was mixed with 300 g of 8 wt% MgCl2 aqueous solution and stirred for 1 h, then 85 g of 6.5 wt% NaOH aqueous solution was added and stirred for 2 h, then washed with ethanol and deionized water respectively and filtered to obtain a filter cake, which was dried at 80 °C for 10 h and then crushed to obtain silica-Mg(OH)2 powder.

[0058] S3, 100 g of polystyrene, 3 g of foaming agent, the silica-Mg(OH)2 powder obtained in S2, 3 g of curing agent and 0.55 g of plasticizer were uniformly mixed and stirred for 1 h, and then dried to obtain hollow magnesium hydroxide coated silica / polystyrene foaming composite.

[0059] Preparation Example 4

[0060] The preparation method of the magnesium hydroxide coated silica / polystyrene foaming composite of Preparation Example 4 was the same as that of Preparation Example 3, except that the polystyrene content in the raw materials was different, which was shown in Table 1.

[0061] Table 1 Raw material table (g) of magnesium hydroxide coated silica / polystyrene foaming composite of Preparation Examples 4-7

[0062]

[0063] Preparation Example 8

[0064] The preparation method of the magnesium hydroxide coated silica / polystyrene foaming composite of Preparation Example 8 was the same as that of Preparation Example 5, except that a pretreatment step was additionally performed before foaming of polystyrene in S3; the pretreatment conditions were: the polystyrene and foaming agent were mixed and pre-foamed at 0.1 MPa and 100 °C, and then dried at 90 °C for 8 h.

[0065] Preparation Example 9

[0066] The preparation method of the magnesium hydroxide coated silica / polystyrene foaming composite of Preparation Example 9 was the same as that of Preparation Example 5, except that a pretreatment step was additionally performed before foaming of polystyrene in S3; the pretreatment conditions were: the polystyrene and foaming agent were mixed and pre-foamed at 1 MPa and 80 °C, and then dried at 80 °C for 12 h.

[0067] Preparation Example 10

[0068] The preparation method of the magnesium hydroxide coated silica / polystyrene foamed composite of Preparation Example 10 is the same as that of Preparation Example 5, except that hollow silica is used to replace the same amount of silica.

[0069] Preparation Example 11

[0070] The preparation method of the magnesium hydroxide coated silica / polystyrene foamed composite of Preparation Example 11 is the same as that of Preparation Example 5, except that silica coated ammonium polyphosphate is used to replace the same amount of silica.

[0071] Preparation Example 12

[0072] The preparation method of the magnesium hydroxide coated silica / polystyrene foamed composite of Preparation Example 12 is the same as that of Preparation Example 5, except that a mixture of hollow silica and silica coated ammonium polyphosphate is used to replace the same amount of silica, wherein the weight ratio of hollow silica to silica coated ammonium polyphosphate is 1:1.

[0073] Example

[0074] Example 1

[0075] The thermal insulation composite decorative aluminum plate of Example 1 is prepared by the following preparation method:

[0076] S1, the magnesium hydroxide coated silica / polystyrene composite prepared in Preparation Example 1 is put into a molding machine at 95°C, and steam is injected into the mold, the steam is discharged at a pressure of 0.1 MPa and cooled, and the magnesium hydroxide coated silica / polystyrene composite thermal insulation layer plate with a thickness of 9 mm is obtained by demolding;

[0077] S2, the inner lining plate, the thermal insulation layer plate and the decorative aluminum plate are placed from top to bottom in turn, and a layer of adhesive is coated between each plate to obtain a composite layer plate.

[0078] Example 2

[0079] The thermal insulation composite decorative aluminum plate of Example 2 is prepared by the following preparation method:

[0080] S1, the magnesium hydroxide coated silica / polystyrene composite prepared in Preparation Example 1 is put into a molding machine at 95°C, and steam is injected into the mold, the steam is discharged at a pressure of 0.1 MPa and cooled, and the magnesium hydroxide coated silica / polystyrene composite thermal insulation layer plate with a thickness of 9 mm is obtained by demolding;

[0081] S2, the inner lining plate, the thermal insulation layer plate and the decorative aluminum plate are placed from top to bottom in turn, and a layer of adhesive is coated between each plate to obtain a composite layer plate.

[0082] Examples 3-13

[0083] The preparation method of the thermal insulation composite decorative aluminum plate of Example 3-13 is the same as that of Example 1, except that the thermal insulation layer is prepared by using the magnesium oxide coated silica / polystyrene composite prepared in Preparation Example 2-12 to prepare the thermal insulation layer plate.

[0084] Comparative Example

[0085] Comparative Example 1

[0086] The preparation method of the thermal insulation composite decorative aluminum plate of Comparative Example 1 is the same as that of Example 1, except that the thermal insulation layer is prepared by using magnesium hydroxide instead of magnesium hydroxide coated silica / polystyrene foaming composite in an equal amount, and the rest is the same as Example 1.

[0087] Comparative Example 2

[0088] The preparation method of the thermal insulation composite decorative aluminum plate of Comparative Example 2 is the same as that of Example 1, except that the thermal insulation layer is prepared by using silica instead of magnesium hydroxide coated silica / polystyrene foaming composite in an equal amount, and the rest is the same as Example 1.

[0089] Comparative Example 3

[0090] The preparation method of the thermal insulation composite decorative aluminum plate of Comparative Example 3 is the same as that of Example 1, except that the thermal insulation layer is prepared by using polystyrene foam instead of magnesium hydroxide coated silica / polystyrene foaming composite in an equal amount, and the rest is the same as Example 1.

[0091] Comparative Example 4

[0092] The preparation method of the thermal insulation composite decorative aluminum plate of Comparative Example 4 is the same as that of Example 1, except that the thermal insulation layer is prepared by using magnesium hydroxide / polystyrene foaming composite instead of magnesium hydroxide coated silica / polystyrene foaming composite in an equal amount, and the rest is the same as Example 1; wherein the preparation method of the magnesium hydroxide / polystyrene foaming composite is specifically: 80g of polystyrene, 1g of foaming agent and 10g of Mg(OH)2 powder, 1g of curing agent and 0.1g of plasticizer are uniformly mixed and stirred for 1h, and then dried to obtain hollow magnesium hydroxide coated silica / polystyrene composite foaming composite.

[0093] Comparative Example 5

[0094] The preparation method of the thermal insulation composite decorative aluminum plate of Comparative Example 5 is the same as that of Example 1, except that the thermal insulation layer is prepared by using silica / polystyrene foaming composite instead of magnesium hydroxide coated silica / polystyrene foaming composite in an equal amount, and the rest is the same as Example 1; wherein the preparation method of the silica / polystyrene foaming composite is specifically: 80g of polystyrene, 1g of foaming agent and 15g of silica powder, 1g of curing agent and 0.1g of plasticizer are uniformly mixed and stirred for 1h, and then dried to obtain hollow magnesium hydroxide coated silica / polystyrene composite foaming composite.

[0095] Comparative Example 6

[0096] The preparation method of the thermal insulation composite decorative aluminum plate of Comparative Example 6 is the same as that of Example 1, except that the thermal insulation layer is replaced by an equal amount of magnesium hydroxide-coated silicon dioxide instead of magnesium hydroxide-coated silicon dioxide / polystyrene foam composite, and the rest is the same as that of Example 1, wherein the preparation method of the magnesium hydroxide-coated silicon dioxide and the raw materials and amounts used in the S1 and S2 steps of Preparation Example 1 are the same.

[0097] Performance detection

[0098] The thermal conductivity of the thermal insulation composite decorative aluminum plates obtained in different Examples 1-13 and Comparative Examples 1-6 was determined by GB / T 10294-2008, and the test average temperature was 23±2℃. The detection results are shown in Table 2.

[0099] Table 2 Performance detection results of different thermal insulation composite decorative aluminum plates

[0100] Thermal conductivity / W / (m K) Example 1 0.0193 Example 2 0.0192 Example 3 0.0190 Example 4 0.0182 Example 5 0.0172 Example 6 0.0170 Example 7 0.0175 Example 8 0.0180 Example 9 0.0162 Example 10 0.0162 Example 11 0.0160 Example 12 0.0150 Example 13 0.0160 Comparative Example 1 0.0470 Comparative Example 2 0.0510 Comparative Example 3 0.0410 Comparative Example 4 0.0330 Comparative Example 5 0.0290 Comparative Example 6 0.0370

[0101] As shown by the detection results in Table 2, the thermal conductivity of the thermal insulation composite decorative aluminum plate obtained in the present application is as low as 0.0150 W / (m·K), which has excellent thermal insulation performance.

[0102] In Examples 1-7, the thermal conductivity of the thermal insulation composite decorative aluminum plates obtained in Examples 4-6 is 0.0170-0.0182 W / (m·K), which is lower than that of Examples 1-3 and Example 7, indicating that when the weight ratio of silicon dioxide to polystyrene is adjusted to 1:(3.4-3.8) in the preparation of the magnesium hydroxide-coated silicon dioxide / polystyrene foam composite, it is more appropriate, which improves the thermal insulation performance of the thermal insulation composite decorative aluminum plate, which may be related to the further reduction of heat conduction by adjusting the weight ratio of silicon dioxide to polystyrene.

[0103] In Examples 5 and 7-8, the thermal conductivity of the heat-insulating composite decorative aluminum plate obtained in Examples 7-8 is 0.0175-0.0180 W / (m·K), which is higher than that in Example 5, indicating that when the magnesium hydroxide-coated silica / polystyrene foaming composite is prepared, the step of pretreating S3 polystyrene before foaming is more appropriate, and the pretreatment conditions are that the polystyrene and the foaming agent are mixed and pre-foamed at 0.1-1 MPa and 80-100℃, and then dried at 80-90℃ for 8-12 h, which improves the heat-insulating performance of the heat-insulating composite decorative aluminum plate, which may be related to the fact that the step of pretreating S3 polystyrene before foaming and the pretreatment conditions of mixing the polystyrene and the foaming agent, pre-foaming at 0.1-1 MPa and 80-100℃, and then drying at 80-90℃ for 8-12 h can improve the compounding effect of the magnesium hydroxide-coated silica / polystyrene foaming composite.

[0104] In Examples 5 and 10-12, the thermal conductivity of the heat-insulating composite decorative aluminum plate obtained in Examples 7-8 is 0.0150-0.0162 W / (m·K), which is higher than that in Example 5, indicating that when the magnesium hydroxide-coated silica / polystyrene foaming composite is prepared, it is more appropriate to select at least one of hollow silica or silica-coated ammonium polyphosphate as the silica, which improves the heat-insulating performance of the heat-insulating composite decorative aluminum plate, which may be related to the fact that adjusting the silica to at least one of hollow silica or silica-coated ammonium polyphosphate can increase the thermal resistance of the magnesium hydroxide-coated silica / polystyrene foaming composite.

[0105] In addition, according to the thermal conductivity data of the heat-insulating composite decorative aluminum plate of Comparative Examples 1-6 and Example 1, it is found that adjusting the heat-insulating layer of the heat-insulating composite decorative aluminum plate of the present application to the magnesium hydroxide-coated silica / polystyrene foaming composite can improve the heat-insulating performance of the heat-insulating composite decorative aluminum plate to different degrees.

[0106] The specific embodiments are merely an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, as long as the modifications are within the scope of the claims of the present application.

Claims

1. A thermally insulated composite decorative aluminum panel, characterized in that, It includes an inner lining plate, an insulation layer and a decorative aluminum plate arranged from top to bottom, wherein the insulation layer is a magnesium hydroxide-coated silica / polystyrene foam composite. The magnesium hydroxide-coated silica / polystyrene foam composite comprises, by weight, the following raw materials: 15-25 parts silica, 100-200 parts 2-4wt% NaOH aqueous solution, 200-400 parts 7-9wt% MgCl2 aqueous solution, 50-120 parts 6-7wt% NaOH aqueous solution, 80-100 parts polystyrene, 1-5 parts foaming agent, 1-5 parts curing agent, and 0.1-1 parts plasticizer. The magnesium hydroxide-coated silica / polystyrene foam composite was prepared by the following steps: S1. Stir 2-4wt% NaOH aqueous solution with silica at 60-90℃ for 1.5-2.5h, then filter to obtain filter cake. Wash and dry the filter cake to obtain pretreated silica. S2. The pretreated silica obtained in S1 is mixed with 7-9 wt% MgCl2 aqueous solution and stirred for 0.5-1.5 h. Then, 6-7 wt% NaOH aqueous solution is added and stirred for 1-3 h. The mixture is then washed and filtered to obtain a filter cake. The filter cake is then dried, pulverized, and silica-Mg(OH)2 powder is obtained. S3. Mix polystyrene, foaming agent and silica-Mg(OH)2 powder obtained from S2, curing agent and plasticizer, stir for 1-5 hours, and then dry to obtain hollow magnesium hydroxide coated silica / polystyrene composite foaming compound.

2. The thermal insulation composite decorative aluminum panel according to claim 1, characterized in that, The S3 process also includes a pretreatment step before the polystyrene foaming.

3. The thermal insulation composite decorative aluminum panel according to claim 2, characterized in that, The pretreatment is as follows: polystyrene and foaming agent are mixed and pre-foamed at 0.1-1 MPa and 80-100℃, and then dried at 50-90℃ for 8-12 hours.

4. The thermal insulation composite decorative aluminum panel according to claim 1, characterized in that, The weight ratio of silicon dioxide to polystyrene is 1:(3.4-3.8).

5. The thermal insulation composite decorative aluminum panel according to claim 1, characterized in that, The silica is at least one of hollow silica or silica-coated ammonium polyphosphate.

6. A method for preparing a thermally insulated composite decorative aluminum panel according to any one of claims 1-5, characterized in that, Includes the following steps: S1. The magnesium hydroxide-coated silica / polystyrene composite is molded at 90-100℃, and steam is injected into the mold. The steam is removed and cooled under a pressure of 0.1-0.2MPa. The magnesium hydroxide-coated silica / polystyrene composite insulation board is obtained by demolding. S2. Place the inner lining board, insulation board and decorative aluminum board from top to bottom, and apply a layer of adhesive between each board to obtain a composite board.

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