Ceramic fiber-based mesh cloth for exterior wall and preparation method thereof

Abstract

The present invention relates to a ceramic fiber-based mesh cloth for exterior walls and a preparation method thereof. 2 O 3 Sol, SiO 2 Sol, TiO 2 The sol is compounded, and gel fibers are obtained through a spinning system, and composite ceramic fibers are obtained by sintering; the composite ceramic fibers are blended with ramie fibers to obtain blended yarns; and finally, the blended yarns are used to obtain ceramic fiber mesh cloth. The mesh cloth prepared by the present invention contains ramie fibers, which can enhance the friction between fibers, thereby significantly enhancing the tensile strength of the mesh cloth in the transverse and longitudinal directions. The raw materials of the mesh cloth prepared by the present invention are widely available, the preparation process is mature, and it has good market application and promotion value.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of ceramic fiber mesh cloth, and in particular relates to a ceramic fiber-based mesh cloth for exterior walls and a preparation method thereof. Background Art

[0002] At present, quality problems such as wall cracking and falling off caused by building plastering projects are quite common, which brings inconvenience to further wall decoration projects such as facing bricks and painting. Applying glass fiber mesh cloth on the surface of wall plastering layer is an effective way to prevent cracking and falling off of wall plastering layer, which can effectively promote the healthy development of building decoration industry.

[0003] The role of glass fiber mesh cloth in the wall is analyzed as follows: by setting a layer of glass fiber mesh cloth on the surface of the plaster layer, the mortar and the glass fiber mesh cloth are subjected to force synergistically, the tensile strength of the mortar surface layer is increased, the mechanical strength of the plaster decorative surface layer is improved, the force is evenly distributed, the shrinkage stress is dispersed, and the uneven force caused by stress concentration due to changes in environmental humidity is avoided, which leads to quality problems such as cracking and falling of the wall. Therefore, the role of glass fiber mesh cloth in building walls is becoming increasingly obvious, but literature research shows that there are few studies and reports on glass fiber mesh cloth, and further research in this area needs to be carried out.

[0004] The market for glass fiber mesh for construction is huge, but most glass fiber mesh has poor alkali resistance, poor strength and high cost, which limits its widespread promotion and application. Therefore, it is urgent to find a ceramic fiber with strong alkali resistance, high strength and low price. Summary of the invention

[0005] The object of the present invention is to provide a ceramic fiber-based mesh cloth for exterior walls to solve the above-mentioned problems existing in the prior art. The ceramic fiber-based mesh cloth can be used for the construction and decoration of exterior wall surfaces.

[0006] The object of the present invention is to provide a ceramic fiber-based mesh cloth for exterior walls, which can be prepared by the following method: 2 O 3 Sol, SiO 2 Sol, TiO 2 The sol is compounded, and gel fibers are obtained through a spinning system, which are sintered to obtain composite ceramic fibers; the composite ceramic fibers are blended with ramie fibers to obtain blended yarns; and finally, the blended yarns are used to obtain ceramic fiber mesh cloths.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned ceramic fiber-based mesh cloth for exterior walls, the preparation method comprising the following steps:

[0008] (1)Al 2 O 3 Preparation of sol: Dissolve aluminum powder and aluminum chloride in deionized water, heat and stir at 40℃~60℃, filter after aluminum powder is dissolved, and Al 2 O 3 Sol.

[0009] Preferably, the molar mass ratio of the aluminum powder (mol), aluminum chloride (mol), and deionized water (mol) is 5-7:1-2:60-80.

[0010] (2)SiO 2 Preparation of sol: Dissolve 20% hydrochloric acid in deionized water to prepare hydrochloric acid aqueous solution, dissolve ethyl silicate in the hydrochloric acid aqueous solution, stir evenly, the reaction temperature is 20℃~30℃, the reaction time is 10~20 hours, and SiO 2 Sol.

[0011] Preferably, the volume ratio of ethyl silicate (mL), deionized water (mL), and 20% hydrochloric acid (mL) is: 40-50:20-30:5-10.

[0012] (3)TiO 2 Preparation of sol: dissolve tetrabutyl titanate in a mixed solution of ethanol and lactic acid, stir evenly, the reaction temperature is 20°C to 30°C, and the reaction time is 1 to 2 hours.

[0013] Preferably, the mass volume ratio of tetrabutyl titanate (mol), ethanol (mL), and lactic acid (mL) is: 0.02-0.05:10-20:1-2.

[0014] (4) Mixing: Mix the Al prepared in step (1) 2 O 3 Sol, SiO prepared in step (2) 2 Sol, TiO prepared in step (3) 2 The sol is uniformly mixed and stirred for 1 to 2 hours to obtain an initial mixed sol; it is placed at 20°C to 40°C for aging for 2 to 6 hours, and the viscosity of the mixed sol is continuously measured, that is, a glass rod is immersed in the sol and slowly lifted up to observe the formation state of thin and long silk threads. When the sol meets the viscosity of spinning and its viscosity reaches 25 to 95 Pa·s, the mixed sol to be spun is obtained.

[0015] Preferably, the Al 2 O 3 Sol (mL), SiO 2 Sol (mL), TiO 2 The volume-to-mass ratio of the sol (mL) is 10-20:80-90:10-20;

[0016] (5) Preparation of composite ceramic fiber: spinning the mixed sol obtained in step (4) using a spinning device to obtain gel fiber; sintering the gel fiber at 400° C. to 500° C. for 3 to 5 hours to obtain composite ceramic fiber;

[0017] (6) blended yarn: blending the composite ceramic fiber prepared in step (5) with ramie fiber to obtain a blended yarn;

[0018] Preferably, the usage ratio of the composite ceramic fiber (g) to the ramie fiber (g) is: 1:0.2-0.4;

[0019] (7) Preparation of mesh cloth: The yarn prepared in step (6) is used to make a mesh cloth.

[0020] The present invention has the following notable features:

[0021] (1) The inventors of the present application unexpectedly discovered that using Al 2 O 3 Sol, SiO 2 Sol, TiO 2 The sol is compounded to obtain a composite ceramic fiber, which contains Al, Si and Ti elements and exhibits good acid and alkali resistance and strength performance.

[0022] (2) The mesh cloth prepared by the present invention contains ramie fibers, which can enhance the friction between the fibers, thereby significantly enhancing the tensile strength of the mesh cloth in the transverse and longitudinal directions.

[0023] (3) The raw materials of the mesh cloth prepared by the present invention are widely available, the preparation process is mature, and it has good market application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the spinning equipment used to prepare the composite ceramic fiber in Examples 1 to 3 (1. nitrogen; 2. pressure vessel; 3. spinneret; 4. yarn; 5. moving head; 6. roller; 7. temperature control device; 8. engine);

[0025] Figure 2 Electron micrograph of the composite ceramic fiber prepared in Example 1. DETAILED DESCRIPTION

[0026] The examples described below illustrate the present invention in detail.

[0027] Example 1

[0028] In this embodiment, a ceramic fiber mesh cloth for exterior wall is prepared by the following method, including the following steps:

[0029] (1)Al 2 O 3 Preparation of sol: Dissolve 5 mol of metallic aluminum powder and 1 mol of aluminum chloride in 60 mol of deionized water, heat and stir at 50°C, filter after the aluminum powder is dissolved, and you can get Al 2 O 3 Sol.

[0030] (2)SiO 2 Preparation of sol: Dissolve 5 mL of 20% hydrochloric acid in 20 mL of deionized water to prepare a hydrochloric acid aqueous solution, dissolve 40 mL of ethyl silicate in the hydrochloric acid aqueous solution, stir evenly, and the reaction temperature is 25 ° C. The reaction time is 15 hours to obtain SiO 2 Sol.

[0031] (3)TiO 2 Preparation of sol: 0.04 mol of tetrabutyl titanate was dissolved in a mixed solution of 20 mL of ethanol and 2 mL of lactic acid, and stirred evenly. The reaction temperature was 25° C. and the reaction time was 1.5 hours.

[0032] (4) Mixing: 10 mL of Al prepared in step (1) 2 O 3 Sol, 80 mL of SiO prepared in step (2) 2 Sol, 10 mL of TiO prepared in step (3) 2 The sol was uniformly mixed and stirred for 1 hour to obtain an initial mixed sol, which was then aged at 30° C. for 4 hours. When the viscosity reached 53.9 Pa·s, a mixed sol to be spun was obtained.

[0033] (5) Preparation of composite ceramic fiber: The mixed sol obtained in step (4) is spun using a spinning device. The schematic diagram of the spinning device is shown in FIG. Figure 1 As shown, the gel fiber is obtained; the gel fiber is sintered at 400°C for 4 hours to obtain a composite ceramic fiber. The electron microscope image of the composite ceramic fiber is shown in Figure 2 shown.

[0034] (6) Blended yarn: 1 kg of the composite ceramic fiber prepared in step (5) was blended with 0.2 kg of ramie fiber to obtain a blended yarn.

[0035] (7) Preparation of mesh cloth: The yarn prepared in step (6) is used to make a mesh cloth, wherein the mesh size of the mesh cloth is 5 mm×5 mm and the fabric weight is 58.8 g / m 2 .

[0036] Example 2

[0037] In this embodiment, a ceramic fiber mesh cloth for exterior wall is prepared by the following method, including the following steps:

[0038] (1)Al 2 O 3 Preparation of sol: Dissolve 6 mol of aluminum powder and 1.5 mol of aluminum chloride in 70 mol of deionized water, heat and stir at 50°C, filter after the aluminum powder is dissolved, and you can get Al 2 O 3 Sol.

[0039] (2)SiO 2 Preparation of sol: Dissolve 7.5 mL of 20% hydrochloric acid in 25 mL of deionized water to prepare a hydrochloric acid aqueous solution, dissolve 45 mL of ethyl silicate in the hydrochloric acid aqueous solution, stir evenly, and the reaction temperature is 25 ° C. The reaction time is 15 hours to obtain SiO 2 Sol.

[0040] (3)TiO 2 Preparation of sol: 0.06 mol of tetrabutyl titanate was dissolved in a mixed solution of 30 mL of ethanol and 3 mL of lactic acid, and stirred evenly. The reaction temperature was 25° C. and the reaction time was 1.5 hours.

[0041] (4) Mixing: 15 mL of Al prepared in step (1) 2 O 3 Sol, 85 mL of SiO prepared in step (2) 2 Sol, 15 mL of TiO prepared in step (3) 2 The sol was uniformly mixed and stirred for 1.5 hours to obtain an initial mixed sol, which was then aged at 20° C. for 2 hours. When the viscosity reached 44.5 Pa·s, a mixed sol to be spun was obtained.

[0042] (5) Preparation of composite ceramic fiber: The mixed sol obtained in step (4) is spun using a spinning device. The schematic diagram of the spinning device is shown in FIG. Figure 1 As shown, gel fiber is obtained; the gel fiber is sintered at 450° C. for 4 hours to obtain composite ceramic fiber.

[0043] (6) Blended yarn: 1 kg of the composite ceramic fiber prepared in step (5) was blended with 0.3 kg of ramie fiber to obtain a blended yarn.

[0044] (7) Preparation of mesh cloth: The yarn prepared in step (6) is used to make a mesh cloth, wherein the mesh size of the mesh cloth is 5 mm×5 mm and the fabric weight is 56.2 g / m 2 .

[0045] Example 3

[0046] In this embodiment, a ceramic fiber mesh cloth for exterior wall is prepared by the following method, including the following steps:

[0047] (1)Al 2 O 3 Preparation of sol: Dissolve 7 mol of aluminum powder and 2 mol of aluminum chloride in 80 mol of deionized water, heat and stir at 50°C, filter after the aluminum powder is dissolved, and you can get Al 2 O 3 Sol.

[0048] (2)SiO 2 Preparation of sol: Dissolve 10 mL of 20% hydrochloric acid in 30 mL of deionized water to prepare a hydrochloric acid aqueous solution, dissolve 50 mL of ethyl silicate in the hydrochloric acid aqueous solution, stir evenly, and the reaction temperature is 25 ° C. The reaction time is 15 hours to obtain SiO 2 Sol.

[0049] (3)TiO 2 Preparation of sol: 0.1 mol of tetrabutyl titanate was dissolved in a mixed solution of 40 mL of ethanol and 4 mL of lactic acid, and stirred evenly. The reaction temperature was 25° C. and the reaction time was 1.5 hours.

[0050] (4) Mixing: 20 mL of Al prepared in step (1) 2 O 3 Sol, 90 mL of SiO prepared in step (2) 2 Sol, 20 mL of TiO prepared in step (3) 2 The sol was uniformly mixed and stirred for 2 hours to obtain an initial mixed sol, which was then aged at 40° C. for 6 hours. When the viscosity reached 88.9 Pa·s, a mixed sol to be spun was obtained.

[0051] (5) Preparation of composite ceramic fiber: The mixed sol obtained in step (4) is spun using a spinning device. The schematic diagram of the spinning device is shown in FIG. Figure 1 As shown, gel fiber is obtained; the gel fiber is sintered at 500° C. for 5 hours to obtain composite ceramic fiber.

[0052] (6) Blended yarn: 1 kg of the composite ceramic fiber prepared in step (5) was blended with 0.4 kg of ramie fiber to obtain a blended yarn.

[0053] (7) Preparation of mesh cloth: The yarn prepared in step (6) is used to make a mesh cloth, wherein the mesh size of the mesh cloth is 5 mm×5 mm and the fabric weight is 59.2 g / m 2 .

Claims

1. A method for preparing a ceramic fiber-based mesh cloth for exterior walls, characterized in that: The preparation method comprises the following steps: (1) Mixing: Al2O3 sol, SiO2 sol and TiO2 sol are uniformly mixed and stirred for 1 to 2 hours to obtain an initial mixed sol; the mixed sol is aged at 20°C to 40°C for 2 to 6 hours until the viscosity reaches 25 to 95 Pa·s to obtain a mixed sol to be spun; (2) Preparation of composite ceramic fiber: The mixed sol obtained in step (1) is spun by a spinning device to obtain gel fiber; the gel fiber is sintered at 400° C. to 500° C. for 3 to 5 hours to obtain composite ceramic fiber; (3) blended yarn: blending the composite ceramic fiber prepared in step (2) with ramie fiber to obtain a blended yarn; (4) Preparation of mesh cloth: preparing a mesh cloth from the yarn prepared in step (3); In the step (1), the volume ratio of Al2O3 sol, SiO2 sol and TiO2 sol is (10-20) mL: (80-90) mL: (10-20) mL; In the step (3), the usage ratio of the composite ceramic fiber to the ramie fiber is 1 g: (0.2-0.4) g.

2. The method for preparing a ceramic fiber-based mesh cloth for exterior walls according to claim 1, characterized in that: The preparation method of the Al2O3 sol in the step (1) is as follows: dissolve metallic aluminum powder and aluminum chloride in deionized water, heat and stir at 40°C to 60°C, filter after the aluminum powder is dissolved, and the Al2O3 sol can be obtained; the molar mass ratio of the aluminum powder, aluminum chloride and deionized water is (5-7) mol: (1-2) mol: (60-80) mol.

3. The method for preparing a ceramic fiber-based mesh cloth for exterior walls according to claim 1, characterized in that: The preparation method of SiO2 sol in the step (1) is as follows: dissolve 20% hydrochloric acid in deionized water to prepare a hydrochloric acid aqueous solution, dissolve ethyl silicate in the hydrochloric acid aqueous solution, stir evenly, and react at a temperature of 20°C to 30°C for 10 to 20 hours to obtain SiO2 sol; the volume ratio of ethyl silicate, deionized water, and 20% hydrochloric acid is (40 to 50) mL: (20 to 30) mL: (5 to 10) mL.

4. The method for preparing a ceramic fiber-based mesh cloth for exterior walls according to claim 1, characterized in that: The preparation method of TiO2 sol in step (1) is as follows: tetrabutyl titanate is dissolved in a mixed solution of ethanol and lactic acid, and the mixture is stirred evenly. The reaction temperature is 20°C to 30°C, and the reaction time is 1 to 2 hours. The mass volume ratio of tetrabutyl titanate, ethanol and lactic acid is (0.02 to 0.05) mol: (10 to 20) mL: (1 to 2) mL.

5. A ceramic fiber-based mesh cloth for exterior walls, characterized in that: The ceramic fiber-based mesh cloth for exterior walls is prepared by the preparation method of any one of claims 1 to 4.

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