Outer wall decorative plate and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and provides an outer wall decorative plate and a preparation method thereof. The method comprises the following steps: mixing natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water to obtain a decorative coating; and coating a base plate with the decorative coating to form a decorative layer, so as to obtain the outer wall decorative plate. The natural stone and the inorganic clay are used as main components of the decorative layer, so that the raw materials are easy to obtain, pollution-free to the environment and harmless to human health; moreover, due to the bonding characteristic of the inorganic clay, in the compounding process of the base plate and the decorative layer, additional organic auxiliaries such as an interface agent or an organic silicon adhesive do not need to be added, and a large amount of cost and time are saved. In addition, the obtained outer wall decorative plate has excellent weather resistance, and the service life of the outer wall decorative plate is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to an exterior wall decorative plate and a preparation method thereof. Background Art

[0002] In modern buildings, exterior wall decorative panels are being used more and more widely. Compared with other finishing materials, they have many advantages, such as excellent wind resistance, easy installation, and environmental protection and pollution-free. There are many types of exterior wall decorative panels, which can be ceramic, stone, wood, metal, synthetic materials, etc. When choosing, the first thing to consider is the performance of various decorative panels, such as waterproofness, impact resistance, UV resistance, service life, etc., the purpose is to improve the ability of the wall to resist erosion and damage by various factors in nature such as dust, rain, snow, freezing, and sunlight, and to meet the functional requirements of insulation, heat insulation, sound insulation, waterproofing, and beautification together with the wall structure. However, existing exterior wall decorative panels usually have defects such as insufficient weather resistance and short service life. Therefore, how to provide an exterior wall decorative panel with excellent weather resistance has become a problem that technicians in this field need to solve urgently. Summary of the invention

[0003] In view of this, the present invention provides an exterior wall decorative panel and a preparation method thereof, the purpose of which is to solve the technical problems of the existing exterior wall decorative panels, such as insufficient weather resistance and short service life.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] The present invention provides an exterior wall decorative plate, comprising a substrate and a decorative layer;

[0006] The decorative layer is prepared from the following raw materials in parts by weight:

[0007] 40-50 parts of natural stone, 40-50 parts of inorganic clay, 5-15 parts of cement, 10-20 parts of quartz sand, 1-5 parts of graphene oxide, 1-5 parts of inorganic pigment, 1-5 parts of inorganic salt, 10-30 parts of water;

[0008] The natural stone includes limestone powder and / or calcite powder; the inorganic clay includes one or more of montmorillonite, kaolin and sepiolite.

[0009] Furthermore, the particle size of the natural stone is 0.2 to 2 mm.

[0010] Furthermore, the cement includes one or more of silicate cement, sulphoaluminate cement, high aluminate cement and white cement.

[0011] Furthermore, the inorganic pigment includes one or more of red iron oxide, aluminum oxide, titanium dioxide and zinc white.

[0012] Furthermore, the inorganic salt includes one or more of sodium chloride, calcium chloride, sodium sulfate, sodium nitrate and sodium nitrite.

[0013] Further, the substrate includes a calcium silicate board, a cement fiber pressure board or an asbestos-free fiber cement pressure board.

[0014] Furthermore, the thickness of the decorative layer is ≤3 cm.

[0015] The present invention also provides a method for preparing the above exterior wall decorative panel, comprising the following steps:

[0016] The decorative coating is obtained by mixing natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water; the decorative coating is coated on a substrate to form a decorative layer to obtain an exterior wall decorative panel.

[0017] Furthermore, the decorative coating is coated on the substrate and cured to form a decorative layer, wherein the curing temperature is 20 to 40° C. and the curing time is 36 to 72 hours.

[0018] It can be seen from the above technical solution that compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The present invention uses natural stone and inorganic clay as the main components of the decorative layer. Not only are the raw materials easily available, but they are also non-polluting to the environment and harmless to human health. In addition, due to the bonding properties of the inorganic clay, in the composite process of the substrate and the decorative layer, there is no need to add additional interface agents or organic additives such as organic silicone adhesives, thereby saving a lot of cost and time.

[0020] The decorative layers provided by the present invention are all composed of inorganic materials, and have the advantages of being environmentally friendly, chemically stable and flame retardant, so that the exterior wall decorative panels have excellent weather resistance and increase their service life. DETAILED DESCRIPTION

[0021] The present invention provides an exterior wall decorative plate, comprising a substrate and a decorative layer;

[0022] The decorative layer is prepared from the following raw materials in parts by weight:

[0023] 40-50 parts of natural stone, 40-50 parts of inorganic clay, 5-15 parts of cement, 10-20 parts of quartz sand, 1-5 parts of graphene oxide, 1-5 parts of inorganic pigment, 1-5 parts of inorganic salt, and 10-30 parts of water.

[0024] In the present invention, the amount of the natural stone is preferably 42 to 48 parts, and more preferably 44 to 46 parts.

[0025] In the present invention, the amount of the inorganic clay is preferably 42 to 48 parts, more preferably 44 to 46 parts.

[0026] In the present invention, the amount of cement used is preferably 7 to 14 parts, and more preferably 9 to 12 parts.

[0027] In the present invention, the amount of quartz sand is preferably 12 to 18 parts, more preferably 14 to 16 parts.

[0028] In the present invention, the amount of graphene oxide used is preferably 2 to 4 parts, more preferably 3 parts.

[0029] In the present invention, the usage of the inorganic pigment is preferably 2 to 4 parts, more preferably 3 parts.

[0030] In the present invention, the usage of the inorganic salt is preferably 2 to 4 parts, more preferably 3 parts.

[0031] In the present invention, the amount of water used is preferably 14 to 26 parts, and more preferably 18 to 24 parts.

[0032] In the present invention, the natural stone includes limestone powder and / or calcite powder, preferably limestone powder. The natural stone has extremely strong wear resistance and corrosion resistance, and also has heat insulation and fire prevention effects. It can not only enhance the weather resistance of the exterior wall decorative board, but also improve the fire prevention function of the exterior wall decorative board to a certain extent; the inorganic clay includes one or more of montmorillonite, kaolin and sepiolite, preferably montmorillonite and / or kaolin, and further preferably montmorillonite. The chemical properties of inorganic clay are stable and are not affected by factors such as temperature, pH value and moisture, so it can enhance the weather resistance of the exterior wall decorative board; in addition, the inorganic clay can also enhance the bonding force between the substrate and the decorative layer.

[0033] In the present invention, the particle size of the natural stone is 0.2 to 2 mm, preferably 0.4 to 1.6 mm, and more preferably 0.6 to 1.2 mm.

[0034] In the present invention, the cement includes one or more of Portland cement, sulphoaluminate cement, high aluminate cement and white cement, preferably one or more of Portland cement, sulphoaluminate cement and white cement, and more preferably Portland cement and / or white cement.

[0035] In the present invention, due to the unique conjugated structure of graphene oxide, layers are stacked to form a dense anti-corrosion layer, which can effectively inhibit the infiltration and penetration of water into the exterior wall decorative panels; in addition, due to the excellent mechanical properties and chemical stability of graphene oxide, the exterior wall decorative panels have good scratch resistance, mechanical properties and chemical stability.

[0036] In the present invention, the inorganic pigment includes one or more of red iron oxide, aluminum oxide, titanium dioxide and zinc white, preferably one or more of red iron oxide, aluminum oxide and zinc white, and more preferably red iron oxide and / or aluminum oxide.

[0037] In the present invention, the inorganic salt includes one or more of sodium chloride, calcium chloride, sodium sulfate, sodium nitrate and sodium nitrite, preferably one or more of sodium chloride, sodium sulfate, sodium nitrate and sodium nitrite, and more preferably one or more of sodium chloride, sodium sulfate and sodium nitrite.

[0038] In the present invention, the substrate comprises a calcium silicate board, a cement fiber pressure board or an asbestos-free fiber cement pressure board, preferably a calcium silicate board or a cement fiber pressure board, and more preferably a calcium silicate board.

[0039] In the present invention, the thickness of the decorative layer is ≤3 cm, preferably ≤2.5 cm, and more preferably ≤2 cm.

[0040] The present invention also provides a method for preparing the above exterior wall decorative panel, comprising the following steps:

[0041] The decorative coating is obtained by mixing natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water; the decorative coating is coated on a substrate to form a decorative layer to obtain an exterior wall decorative panel.

[0042] In the present invention, mixing is performed by stirring at a speed of 30 to 100 rpm, preferably 40 to 80 rpm, and more preferably 50 to 60 rpm; the stirring time is 10 to 30 min, preferably 15 to 25 min, and more preferably 20 min.

[0043] In the present invention, the decorative coating is coated on the substrate and cured to form a decorative layer. The curing temperature is 20-40°C, preferably 24-36°C, and more preferably 28-32°C. The curing time is 36-72h, preferably 40-60h, and more preferably 48-54h.

[0044] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0045] Example 1

[0046] The decorative layer provided in this embodiment includes the following components in parts by weight:

[0047] 46 parts of natural stone (the amount of limestone powder and calcite powder is the same), 42 parts of inorganic clay (the amount of montmorillonite, kaolin and sepiolite is the same), 10 parts of ordinary Portland cement, 15 parts of quartz sand, 3 parts of graphene oxide, 4 parts of inorganic pigment (the amount of red iron oxide and aluminum oxide is the same), 3 parts of sodium chloride, and 30 parts of water.

[0048] The specific preparation steps of the exterior wall decorative panels are as follows:

[0049] Add natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water into a mixer, and stir at a speed of 60 rpm for 20 minutes to obtain a decorative coating; take a cleaned calcium silicate board, evenly cover the decorative coating on the calcium silicate board to form a 2 cm decorative layer, and maintain at 25°C for 72 hours to obtain an exterior wall decorative board.

[0050] Example 2

[0051] The decorative layer provided in this embodiment includes the following components in parts by weight:

[0052] 48 parts of natural stone (the amount of limestone powder and calcite powder is the same), 45 parts of inorganic clay (the amount of montmorillonite, kaolin and sepiolite is the same), 12 parts of ordinary Portland cement, 11 parts of quartz sand, 4 parts of graphene oxide, 2 parts of inorganic pigment (the amount of red iron oxide and aluminum oxide is the same), 3 parts of sodium sulfate, and 26 parts of water.

[0053] The specific preparation steps of the exterior wall decorative panels are as follows:

[0054] Add natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water into a mixer, and stir at a speed of 50 rpm for 25 minutes to obtain a decorative coating; take a cleaned cement fiber pressure board, evenly cover the decorative coating on the cement fiber pressure board to form a 2 cm decorative layer, and maintain at 30°C for 60 hours to obtain an exterior wall decorative board.

[0055] Example 3

[0056] The decorative layer provided in this embodiment includes the following components in parts by weight:

[0057] 45 parts of natural stone (the amount of limestone powder and calcite powder is the same), 48 parts of inorganic clay (the amount of montmorillonite, kaolin and sepiolite is the same), 8 parts of ordinary Portland cement, 8 parts of quartz sand, 2 parts of graphene oxide, 3 parts of inorganic pigment (the amount of red iron oxide and aluminum oxide is the same), 3 parts of sodium nitrate, and 26 parts of water.

[0058] The specific preparation steps of the exterior wall decorative panels are as follows:

[0059] Add natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water into a mixer, and stir at a speed of 80 rpm for 12 minutes to obtain a decorative coating; take a cleaned asbestos-free fiber cement pressure board, evenly cover the decorative coating on the asbestos-free fiber cement pressure board to form a 2 cm decorative layer, and maintain it at 35°C for 48 hours to obtain an exterior wall decorative board.

[0060] Example 4

[0061] The decorative layer provided in this embodiment includes the following components in parts by weight:

[0062] 44 parts of natural stone (the amount of limestone powder and calcite powder is the same), 42 parts of inorganic clay (the amount of montmorillonite, kaolin and sepiolite is the same), 12 parts of ordinary Portland cement, 13 parts of quartz sand, 1 part of graphene oxide, 3 parts of red iron oxide, 2 parts of sodium chloride, and 24 parts of water.

[0063] The specific preparation steps of the exterior wall decorative panels are as follows:

[0064] Add natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water into a mixer, and stir at a speed of 60 rpm for 22 minutes to obtain a decorative coating; take a cleaned calcium silicate board, evenly cover the decorative coating on the calcium silicate board to form a 2 cm decorative layer, and maintain at 25°C for 70 hours to obtain an exterior wall decorative board.

[0065] Example 5

[0066] The decorative layer provided in this embodiment includes the following components in parts by weight:

[0067] 46 parts of natural stone (the amount of limestone powder and calcite powder is the same), 44 parts of inorganic clay (the amount of montmorillonite and kaolin is the same), 10 parts of ordinary Portland cement, 14 parts of quartz sand, 3 parts of graphene oxide, 4 parts of inorganic pigment (the amount of red iron oxide and titanium dioxide is the same), 3 parts of sodium nitrite, and 30 parts of water.

[0068] The specific preparation steps of the exterior wall decorative panels are as follows:

[0069] Add natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water into a mixer, stir at a speed of 80 rpm for 20 minutes to obtain decorative coating; take a cleaned calcium silicate board, evenly cover the decorative coating on the calcium silicate board to form a 2 cm decorative layer, and maintain at 30°C for 66 hours to obtain an exterior wall decorative board.

[0070] The performance of the exterior wall decorative panel prepared in Example 1 was evaluated. The test items, methods and results are shown in Table 1.

[0071] Table 1 Performance test results of the exterior wall decorative board of Example 1

[0072]

[0073]

[0074] The performance of the exterior wall decorative panels prepared in Examples 2 to 5 was evaluated according to the testing method of Example 1. The test items and results are shown in Table 2.

[0075] Table 2 Performance test results of the exterior wall decorative panels of Examples 2 to 5

[0076]

[0077]

[0078] It can be seen from Table 1 and Table 2 that the exterior wall decorative panel prepared by the present invention has good impact resistance, water resistance and weather resistance, and the bonding strength between the decorative layer and the substrate is large, and has a long service life.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An exterior wall decorative panel, characterized in that: including a substrate and a decorative layer; The decorative layer is prepared from the following raw materials in parts by weight: 40-50 parts of natural stone, 40-50 parts of inorganic clay, 5-15 parts of cement, 10-20 parts of quartz sand, 1-5 parts of graphene oxide, 1-5 parts of inorganic pigment, 1-5 parts of inorganic salt, 10-30 parts of water; The natural stone includes limestone powder and / or calcite powder; the inorganic clay includes one or more of montmorillonite, kaolin and sepiolite.

2. The exterior wall decoration board according to claim 1, characterized in that: The particle size of the natural stone is 0.2-2 mm.

3. The exterior wall decoration board according to claim 1 or 2, characterized in that: The cement includes one or more of silicate cement, sulphoaluminate cement, high aluminate cement and white cement.

4. The exterior wall decoration board according to claim 3, characterized in that: The inorganic pigment includes one or more of red iron oxide, aluminum oxide, titanium dioxide and zinc white.

5. The exterior wall decoration board according to claim 1, 2 or 4, characterized in that: The inorganic salt includes one or more of sodium chloride, calcium chloride, sodium sulfate, sodium nitrate and sodium nitrite.

6. The exterior wall decoration board according to claim 5, characterized in that: The substrate includes calcium silicate board, cement fiber pressure board or asbestos-free fiber cement pressure board.

7. The exterior wall decoration board according to claim 1, 2, 4 or 6, characterized in that: The thickness of the decorative layer is ≤3 cm.

8. The method for preparing the exterior wall decorative board according to any one of claims 1 to 7, characterized in that: The following steps are involved: The decorative coating is obtained by mixing natural stone, inorganic clay, cement, quartz sand, graphene oxide, inorganic pigment, inorganic salt and water; the decorative coating is coated on a substrate to form a decorative layer to obtain an exterior wall decorative panel.

9. The preparation method according to claim 8, characterized in that: The decorative coating is coated on the substrate and cured to form a decorative layer. The curing temperature is 20 to 40° C. and the curing time is 36 to 72 hours.

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