Preparation method of GMK low-heat-conductivity and high-strength light heat-insulating brick

Abstract

The invention discloses a preparation method of a GMK low-heat-conductivity, high-strength and light-weight heat-insulating brick, which changes a traditional integrated mold pouring process, and comprises the following steps: injecting a first layer of mixture into a mold in a layered pouring manner, then placing a first layer of compact reinforced screen plate on the first layer of mixture, and then placing a second layer of compact reinforced screen plate on the second layer of mixture; injecting a second layer of mixture on the first layer of compact reinforced screen plate, then placing a second layer of compact reinforced screen plate on the second layer of mixture, and finally injecting a third layer of mixture on the second layer of compact reinforced screen plate, in this way, a structure in which the first-layer mixture, the first-layer compact reinforced screen plate, the second-layer mixture, the second-layer compact reinforced screen plate and the third-layer mixture are distributed is formed, so that the polystyrene foam balls can be blocked through the first-layer compact reinforced screen plate and the second-layer compact reinforced screen plate; the problem that the foam balls float on the upper layer of the whole system due to light volume density, and the heat insulation effect is unbalanced due to uneven air hole distribution is solved.

Description

Technical Field

[0001] The invention belongs to the field of new thermal insulation materials, and in particular relates to a method for preparing a GMK low-thermal conductivity, high-strength and lightweight thermal insulation brick. Background Art

[0002] At present, the preparation method of lightweight insulating bricks is generally to put kaolin, alumina powder, bauxite, kyanite powder and other mineral powders into a mixer according to a certain proportion, add water and sawdust, expandable polystyrene foam balls and burnt fillers, and make a mixed blank or mud after sufficient stirring and mixing, and then vacuum extrude or grouting into a blank, and then dry, high-temperature sinter, cut and grind to shape into products of required specifications; however, the internal structure of the product material produced by this method is uneven, and the thermal conductivity values ​​between batches are inconsistent. This is mainly because the polystyrene foam balls have a light volume density and are easy to float on the upper layer of the mud, resulting in uneven pore distribution, which makes the thermal insulation performance of the entire system uneven and poor. At the same time, the strength of existing insulating bricks is low, and they often cannot meet the requirements when they are used with high strength requirements. In addition, the production cycle is long, which restricts the output and delivery time. Therefore, it is necessary to adjust the preparation process of existing insulating bricks to improve the thermal insulation uniformity and strength performance of the insulating bricks and shorten the drying cycle. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the problem solved by the present invention is: to provide a method for preparing GMK low thermal conductivity, high strength and lightweight insulating bricks with uniform and excellent thermal insulation performance and high structural strength.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A method for preparing a GMK low thermal conductivity, high strength and lightweight insulation brick, the steps are as follows: S1. Prepare the main slurry: put kaolin, alumina powder, bauxite, expansion agent, feldspar powder and gypsum powder into a mixer, then add them into water and stir them thoroughly, then add a curing agent and continue stirring to form a main slurry; S2, thermal insulation filling: the main slurry in step S1 is equally divided into three parts to form a first layer of main slurry, a second layer of main slurry, and a third layer of main slurry, and the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry are respectively placed in three stirring tanks, and thermal insulation filling particles are respectively injected into the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry, and they are fully stirred to form a first layer of mixed material, a second layer of mixed material, and a third layer of mixed material respectively; S3, layered pouring: injecting the first layer of mixed material into the mold, then placing the first layer of dense reinforced mesh on the first layer of mixed material, injecting the second layer of mixed material on the first layer of dense reinforced mesh, then placing the second layer of dense reinforced mesh on the second layer of mixed material, and finally injecting the third layer of mixed material on the second layer of dense reinforced mesh to form a green body; S4, demoulding and firing: after the green body is formed, the green body is taken out from the mold; then the green body is dried and fired at high temperature to obtain the thermal insulation brick.

[0005] Furthermore, in step S1, the curing agent is dimethyl carbonate or glyceride.

[0006] Furthermore, in step S1, the weight proportions of the raw materials are: 20 to 30 parts of kaolin, 15 to 25 parts of alumina powder, 2 to 3 parts of alumina, 3 to 5 parts of expansion agent, 5 to 10 parts of feldspar powder, 6 to 10 parts of gypsum powder, and 2 to 3 parts of curing agent.

[0007] Furthermore, in step S1, the weight ratio of water to material is 2:1.

[0008] Furthermore, in step S2, the weight ratios of the first layer of main slurry, the second layer of main slurry, the third layer of main slurry and the thermal insulation filling particles are all 10:1 to 10:3.

[0009] Furthermore, in step S1, the expansion agent is kyanite powder.

[0010] Furthermore, the heat insulating filling particles in step S2 are polystyrene foam balls.

[0011] Furthermore, in step S3, the first layer of dense reinforced mesh plate and the second layer of dense reinforced mesh plate are made of zirconium diboride material.

[0012] Furthermore, the drying temperature in step S4 is 80 to 100°C; the firing temperature is 800 to 1000°C.

[0013] Furthermore, the mesh apertures of the first layer of dense reinforced mesh panels and the second layer of dense reinforced mesh panels are smaller than the particle size of the thermal insulation filling particles.

[0014] The beneficial effects of the present invention are as follows: The present invention changes the traditional one-piece mold casting process. By pouring in layers, the first layer of mixed material is injected into the mold, and then the first layer of dense reinforced mesh is placed on the first layer of mixed material, the second layer of mixed material is injected on the first layer of dense reinforced mesh, and then the second layer of dense reinforced mesh is placed on the second layer of mixed material. Finally, the third layer of mixed material is injected on the second layer of dense reinforced mesh, so as to form a structure in which the first layer of mixed material, the first layer of dense reinforced mesh, the second layer of mixed material, the second layer of dense reinforced mesh, and the third layer of mixed material are distributed in parallel. In this way, the polystyrene foam balls can be blocked by the first layer of dense reinforced mesh and the second layer of dense reinforced mesh, so as to avoid the foam balls floating on the upper layer of the whole system due to their light volume density, forming the problem of uneven pore distribution causing uneven insulation effect. At the same time, the first layer of dense reinforced mesh and the second layer of dense reinforced mesh are used as the skeleton to synchronously enhance the strength of the whole structural system. The curing agent can accelerate the drying efficiency. DETAILED DESCRIPTION

[0015] The present invention is described in further detail below. Example 1

[0016] A method for preparing a GMK low thermal conductivity, high strength and lightweight insulation brick, the steps are as follows: S1. Prepare the main slurry: put kaolin, aluminum oxide powder, bauxite, expansion agent, feldspar powder and gypsum powder into a mixer, then add into water and stir thoroughly, then add curing agent and continue stirring to form the main slurry; the curing agent is dimethyl carbonate; the expansion agent is kyanite powder; the water-to-material weight ratio is 2:1; the weight parts of each raw material are: 20 parts of kaolin, 15 parts of aluminum oxide powder, 2 parts of bauxite, 3 parts of expansion agent, 5 parts of feldspar powder, 6 parts of gypsum powder and 2 parts of curing agent.

[0017] S2, thermal insulation filling: the main slurry in step S1 is divided into three equal parts to form the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry, and the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry are placed in three stirring tanks respectively, and thermal insulation filling particles are injected into the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry respectively, and are fully stirred to form the first layer of mixed material, the second layer of mixed material, and the third layer of mixed material respectively; the weight ratio of the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry to the thermal insulation filling particles is 10:1. The thermal insulation filling particles are polystyrene foam balls.

[0018] S3, layered casting: inject the first layer of mixed material into the mold, then place the first layer of dense reinforced mesh on the first layer of mixed material, inject the second layer of mixed material on the first layer of dense reinforced mesh, then place the second layer of dense reinforced mesh on the second layer of mixed material, and finally inject the third layer of mixed material on the second layer of dense reinforced mesh to form a green body; the first layer of dense reinforced mesh and the second layer of dense reinforced mesh are made of zirconium diboride material. The mesh aperture of the first layer of dense reinforced mesh and the second layer of dense reinforced mesh is smaller than the particle size of the thermal insulation filling particles.

[0019] S4, demoulding and firing: after the green body is formed, the green body is taken out from the mold, and then the green body is dried and fired at high temperature to obtain the thermal insulation brick. The drying temperature is 80°C, and the firing temperature is 800°C. Example 2

[0020] A method for preparing a GMK low thermal conductivity, high strength and lightweight insulation brick, the steps are as follows: S1. Prepare the main slurry: put kaolin, aluminum oxide powder, bauxite, expansion agent, feldspar powder and gypsum powder into a mixer, then add into water and stir thoroughly, then add curing agent and continue stirring to form the main slurry; the curing agent is glyceride; the expansion agent is kyanite powder; the water-to-material weight ratio is 2:1; the weight parts of each raw material are: 25 parts of kaolin, 20 parts of aluminum oxide powder, 3 parts of bauxite, 4 parts of expansion agent, 7 parts of feldspar powder, 8 parts of gypsum powder and 3 parts of curing agent.

[0021] S2, thermal insulation filling: the main slurry in step S1 is divided into three equal parts to form the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry, and the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry are placed in three stirring tanks respectively, and thermal insulation filling particles are injected into the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry respectively, and are fully stirred to form the first layer of mixed material, the second layer of mixed material, and the third layer of mixed material respectively; the weight ratio of the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry to the thermal insulation filling particles is 10:2. The thermal insulation filling particles are polystyrene foam balls.

[0022] S3, layered casting: inject the first layer of mixed material into the mold, then place the first layer of dense reinforced mesh on the first layer of mixed material, inject the second layer of mixed material on the first layer of dense reinforced mesh, then place the second layer of dense reinforced mesh on the second layer of mixed material, and finally inject the third layer of mixed material on the second layer of dense reinforced mesh to form a green body; the first layer of dense reinforced mesh and the second layer of dense reinforced mesh are made of zirconium diboride material. The mesh aperture of the first layer of dense reinforced mesh and the second layer of dense reinforced mesh is smaller than the particle size of the thermal insulation filling particles.

[0023] S4, demoulding and firing: after the green body is formed, the green body is taken out from the mold, and then the green body is dried and fired at high temperature to obtain the thermal insulation brick. The drying temperature is 90°C, and the firing temperature is 900°C. Example 3

[0024] A method for preparing a GMK low thermal conductivity, high strength and lightweight insulation brick, the steps are as follows: S1. Prepare the main slurry: put kaolin, aluminum oxide powder, bauxite, expansion agent, feldspar powder and gypsum powder into a mixer, then add into water and stir thoroughly, then add curing agent and continue stirring to form the main slurry; the curing agent is dimethyl carbonate; the expansion agent is kyanite powder; the water-to-material weight ratio is 2:1; the weight parts of each raw material are: 30 parts of kaolin, 25 parts of aluminum oxide powder, 3 parts of bauxite, 5 parts of expansion agent, 10 parts of feldspar powder, 10 parts of gypsum powder and 3 parts of curing agent.

[0025] S2, thermal insulation filling: the main slurry in step S1 is divided into three equal parts to form a first layer of main slurry, a second layer of main slurry, and a third layer of main slurry, and the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry are placed in three stirring tanks respectively, and thermal insulation filling particles are injected into the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry respectively, and are fully stirred to form a first layer of mixed material, a second layer of mixed material, and a third layer of mixed material respectively; the weight ratio of the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry to the thermal insulation filling particles is 10:3. The thermal insulation filling particles are polystyrene foam balls.

[0026] S3, layered casting: inject the first layer of mixed material into the mold, then place the first layer of dense reinforced mesh on the first layer of mixed material, inject the second layer of mixed material on the first layer of dense reinforced mesh, then place the second layer of dense reinforced mesh on the second layer of mixed material, and finally inject the third layer of mixed material on the second layer of dense reinforced mesh to form a green body; the first layer of dense reinforced mesh and the second layer of dense reinforced mesh are made of zirconium diboride material. The mesh aperture of the first layer of dense reinforced mesh and the second layer of dense reinforced mesh is smaller than the particle size of the thermal insulation filling particles.

[0027] S4, demoulding and firing: after the green body is formed, the green body is taken out from the mold, and then the green body is dried and fired at high temperature to obtain the thermal insulation brick. The drying temperature is 100°C, and the firing temperature is 1000°C.

[0028] The present invention changes the traditional one-piece mold casting process. By pouring in layers, the first layer of mixed material is injected into the mold, and then the first layer of dense reinforced mesh is placed on the first layer of mixed material, the second layer of mixed material is injected on the first layer of dense reinforced mesh, and then the second layer of dense reinforced mesh is placed on the second layer of mixed material. Finally, the third layer of mixed material is injected on the second layer of dense reinforced mesh, so as to form a structure in which the first layer of mixed material, the first layer of dense reinforced mesh, the second layer of mixed material, the second layer of dense reinforced mesh, and the third layer of mixed material are distributed in parallel. In this way, the polystyrene foam balls can be blocked by the first layer of dense reinforced mesh and the second layer of dense reinforced mesh, so as to avoid the foam balls floating on the upper layer of the whole system due to their light volume density, forming the problem of uneven pore distribution causing uneven insulation effect. At the same time, the first layer of dense reinforced mesh and the second layer of dense reinforced mesh are used as the skeleton to synchronously enhance the strength of the whole structural system. The curing agent can accelerate the drying efficiency.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing GMK low thermal conductivity, high strength and lightweight insulation bricks, characterized in that: Here are the steps: S1. Prepare the main slurry: put kaolin, alumina powder, bauxite, expansion agent, feldspar powder and gypsum powder into a mixer, then add them into water and stir them thoroughly, then add a curing agent and continue stirring to form a main slurry; S2, thermal insulation filling: the main slurry in step S1 is equally divided into three parts to form a first layer of main slurry, a second layer of main slurry, and a third layer of main slurry, and the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry are respectively placed in three stirring tanks, and thermal insulation filling particles are respectively injected into the first layer of main slurry, the second layer of main slurry, and the third layer of main slurry, and they are fully stirred to form a first layer of mixed material, a second layer of mixed material, and a third layer of mixed material respectively; S3, layered pouring: injecting the first layer of mixed material into the mold, then placing the first layer of dense reinforced mesh on the first layer of mixed material, injecting the second layer of mixed material on the first layer of dense reinforced mesh, then placing the second layer of dense reinforced mesh on the second layer of mixed material, and finally injecting the third layer of mixed material on the second layer of dense reinforced mesh to form a green body; S4, demoulding and firing: after the green body is formed, the green body is taken out from the mold; then the green body is dried and fired at high temperature to obtain the thermal insulation brick.

2. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: In step S1, the curing agent is dimethyl carbonate or glyceride.

3. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: In step S1, the weight proportions of the raw materials are: 20 to 30 parts of kaolin, 15 to 25 parts of alumina powder, 2 to 3 parts of alumina, 3 to 5 parts of expansion agent, 5 to 10 parts of feldspar powder, 6 to 10 parts of gypsum powder, and 2 to 3 parts of curing agent.

4. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: In step S1, the weight ratio of water to material is 2:

1.

5. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: The weight ratios of the first layer of main slurry, the second layer of main slurry, the third layer of main slurry and the thermal insulation filling particles in step S2 are all 10:1 to 10:

3.

6. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: In step S1, the expansion agent is kyanite powder.

7. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: The heat insulating filling particles in step S2 are polystyrene foam balls.

8. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: In the step S3, the first layer of dense reinforced mesh plate and the second layer of dense reinforced mesh plate are made of zirconium diboride material.

9. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: The drying temperature in step S4 is 80 to 100°C; the firing temperature is 800 to 1000°C.

10. The GMK low thermal conductivity, high strength and lightweight insulation brick according to claim 1 is characterized in that: The mesh apertures of the first layer of dense reinforced mesh and the second layer of dense reinforced mesh are smaller than the particle size of the thermal insulation filling particles.