Gypsum product with negative ion releasing function and preparation method thereof

Abstract

The present invention discloses a gypsum product with a negative ion release function and a preparation method thereof, which belongs to the technical field of building materials, including (1) adding FeO and graphite to tourmaline, grinding by wet grinding with a planetary ball mill, and drying to obtain a 2000-mesh modified tourmaline powder; (2) mixing and stirring the modified tourmaline powder, a water-retaining resin, sodium citrate and GRG‑α gypsum powder to obtain a premixed gypsum powder; (3) adding the premixed gypsum powder to weighed water, stirring, and preparing a gypsum slurry; (4) preparing the gypsum slurry into a gypsum product. The present invention can effectively improve the negative ion release capacity of the gypsum product by modifying tourmaline and adding a regulator with a negative ion generating function, and has sustainability.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a gypsum product with a negative ion releasing function and a preparation method thereof. Background Art

[0002] Fiber reinforced gypsum products are a kind of building decoration material made of building gypsum and glass fiber as the main raw materials through a certain processing method. It is a building material with light weight, thin thickness, easy processing, and good sound insulation, heat insulation and fire resistance. It is a new type of lightweight material that is currently being developed. It is widely used in interior partitions, wall covering panels, ceilings, sound-absorbing panels, ground base panels and various decorative panels in various buildings such as residences, office buildings, shops, hotels and industrial plants.

[0003] Negative ions can improve the quality of the atmospheric environment and protect human health. They are one of the important indicators for measuring the cleanliness of air quality. The preparation of a fiber-reinforced gypsum product that can continuously release negative ions and use it as a building decoration material can improve people's living environment and benefit human health. At present, fiber-reinforced gypsum products with the ability to release negative ions are basically made by adding tourmaline with the ability to release negative ions as a negative ion generator, which is seriously affected by the environment and cannot continuously release a large amount of negative ions.

[0004] The principle of tourmaline generating negative ions is that it can release free electrons when the temperature or pressure changes, and the free electrons combine with oxygen or water in the environment to generate negative ions. The existing technology also uses tourmaline after modification, and adopts surface modification to increase the binding force between tourmaline and the base material, thereby increasing the application scenarios of tourmaline. Summary of the invention

[0005] Different from the surface modification in the prior art, the present invention modifies tourmaline by increasing the release of negative ions. When negative tourmaline releases electrons, the electrons can react with water molecules, oxygen and other media in the air by increasing the electron transmission property, thereby generating more negative ions. The present invention increases the generation of negative ions and the utilization rate of electrons generated by tourmaline by improving the electron transmission property, and utilizes water-retaining resin to absorb water when the humidity is high and release water molecules when the humidity is low, thereby maintaining the moisture content in the environment, thereby effectively increasing the medium for generating negative ions and maintaining the release of negative ions.

[0006] The invention can effectively improve the negative ion release capacity of gypsum products by modifying tourmaline and adding a regulator with a negative ion generating function.

[0007] Specifically, the present invention discloses a method for preparing a gypsum product with a negative ion releasing function, comprising:

[0008] (1) Based on the mass of tourmaline, 1-3% FeO and 0.5-2.5% graphite are added to the tourmaline, and the mixture is wet-milled using a planetary ball mill and dried to obtain 2000-mesh modified tourmaline powder;

[0009] The ball-to-material ratio is 1:3, anhydrous ethanol is used as the ball milling solvent, agate balls are used as the ball milling medium, the filling rate is 70-90%, and the time is 25-35h;

[0010] (2) Based on the mass of α-gypsum powder, 1-5% of modified tourmaline powder, 2-5% of water-retaining resin, and 0.01-0.05% of sodium citrate are mixed and stirred evenly with the α-gypsum powder to obtain premixed gypsum powder;

[0011] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 of water to premixed gypsum powder, stirring for 20-30 seconds to prepare a gypsum slurry;

[0012] (4) Preparing the gypsum slurry into a gypsum product.

[0013] Furthermore, the water-retaining resin includes polyacrylic acid salt, starch acrylate polymer, starch-acrylonitrile graft copolymer, acrylamide-acrylonitrile-acrylic acid terpolymer.

[0014] The invention also discloses a gypsum product prepared by the method.

[0015] Beneficial effects of the present invention:

[0016] (1) Tourmaline modification: The specific surface area of ​​tourmaline is increased by grinding, and beneficial ingredients FeO and graphite powder are added. The addition of FeO can promote the generation of electrons, and the addition of graphite can increase the electron transmission capacity, thereby promoting the generation of negative ions and effectively increasing the efficiency of negative ion generation.

[0017] (2) Improvement of negative ion release capacity: By adding water-retaining resin, gypsum products contain pores. When the air humidity is high, the moisture in the air enters the pores and is absorbed by the water-retaining capsules; when the air humidity is low, the moisture will diffuse into the air. This method is used to control the moisture balance in the gypsum products, thereby maintaining a balanced negative ion generation efficiency. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments. Example 1

[0019] A method for preparing a gypsum product with a negative ion releasing function, comprising:

[0020] (1) taking 100 parts by weight of tourmaline, adding 1 part by weight of FeO and 0.5 part by weight of graphite to the tourmaline, grinding the tourmaline by wet grinding using a planetary ball mill, and drying the mixture to obtain a 2000 mesh modified tourmaline powder;

[0021] The ball-to-material ratio was 1:3, anhydrous ethanol was used as the ball-milling solvent, agate balls were used as the ball-milling medium, the filling rate was 90%, and the time was 35 h.

[0022] (2) 1 part by mass of modified tourmaline powder, 2 parts by mass of sodium polyacrylate, 0.01 parts by mass of sodium citrate and 100 parts by mass of α-gypsum powder are mixed and stirred uniformly to obtain premixed gypsum powder;

[0023] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 between water and premixed gypsum powder, stirring for 20 seconds to prepare a gypsum slurry;

[0024] (4) Preparing the gypsum slurry into a gypsum product. Example 2

[0025] A method for preparing a gypsum product with a negative ion releasing function, comprising:

[0026] (1) taking 100 parts by weight of tourmaline, adding 3 parts by weight of FeO and 2.5 parts by weight of graphite to the tourmaline, grinding the tourmaline by wet grinding using a planetary ball mill, and drying the resulting tourmaline powder to obtain a 2000 mesh modified tourmaline powder;

[0027] The ball-to-material ratio was 1:3, anhydrous ethanol was used as the ball-milling solvent, agate balls were used as the ball-milling medium, the filling rate was 80%, and the time was 30 h.

[0028] (2) 5 parts by mass of modified tourmaline powder, 5 parts by mass of starch acrylate polymer, 0.05 parts by mass of sodium citrate and 100 parts by mass of α-gypsum powder were mixed and stirred uniformly to obtain premixed gypsum powder;

[0029] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 between water and premixed gypsum powder, stirring for 30 seconds to prepare a gypsum slurry;

[0030] (4) Preparing the gypsum slurry into a gypsum product. Example 3

[0031] A method for preparing a gypsum product with a negative ion releasing function, comprising:

[0032] (1) taking 100 parts by weight of tourmaline, adding 2 parts by weight of FeO and 1.5 parts by weight of graphite to the tourmaline, grinding the tourmaline by wet grinding using a planetary ball mill, and drying the resulting tourmaline powder to obtain a 2000 mesh modified tourmaline powder;

[0033] The ball-to-material ratio was 1:3, anhydrous ethanol was used as the ball-milling solvent, agate balls were used as the ball-milling medium, the filling rate was 70%, and the time was 25 h.

[0034] (2) 2.5 parts by mass of modified tourmaline powder, 4 parts by mass of starch-acrylonitrile graft copolymer, 0.03 parts by mass of sodium citrate and 100 parts by mass of α-gypsum powder were mixed and stirred uniformly to obtain premixed gypsum powder;

[0035] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 between water and premixed gypsum powder, stirring for 25 seconds, and preparing a gypsum slurry;

[0036] (4) Preparing the gypsum slurry into a gypsum product.

[0037] The water-retaining resin of the present invention can be selected from polyacrylic acid salt, starch acrylate polymer, starch-acrylonitrile graft copolymer, acrylamide-acrylonitrile-acrylic acid terpolymer.

[0038] In step (4) of the present invention, the gypsum slurry with negative ion releasing function is made into a gypsum product (GRG) together with the fiber by using the existing technology, and is used as a building interior decoration to release negative ions that are beneficial to the human body. The specific preparation method may include:

[0039] Method 1:

[0040] ① Brush the surface layer and control the thickness to 2-3mm;

[0041] ② Lay the first layer of fiberglass mat;

[0042] ③ Brush the first layer of gypsum slurry and soak the first layer of glass fiber felt;

[0043] ④Additional glass fiber felt is placed at the location of embedded parts;

[0044] ⑤ Place the embedded parts and add the upper layer of glass fiber felt;

[0045] ⑥ Lay the second layer of fiberglass mat;

[0046] ⑦ Brush the second layer of gypsum slurry and soak the second layer of glass fiber felt;

[0047] ⑧Lay the third layer of fiberglass mat;

[0048] ⑨ Brush the third layer of gypsum slurry and soak it in the third layer of glass fiber mat, add two more layers of glass fiber mat at the flange edge and soak them in gypsum slurry;

[0049] ⑩ Drying, film removal and maintenance.

[0050] Method 2:

[0051] ①Spray the surface layer, control the thickness to 2-3mm;

[0052] ② Spray the back layer with glass fiber, spray the glass fiber while spraying the gypsum slurry, so that the glass fiber and gypsum slurry are superimposed layer by layer, adjust the flow rate and speed of the spray gun to ensure that the proportion of glass fiber mass to gypsum slurry is 5-10%, and compact it with a roller, compacting once every 3-5mm;

[0053] ③ Place the embedded parts during step ②, so that the distance between the embedded parts and the surface layer is more than 2-3mm;

[0054] ④ Drying, demolding and curing.

[0055] Method 3:

[0056] ①Spray the surface layer, control the thickness to 2-3mm;

[0057] ②Fix the embedded parts, premix the chopped glass fiber and gypsum slurry, and then pour them above the surface layer to the product thickness;

[0058] ③ Drying, demoulding and curing. Comparative Example 1

[0059] A method for preparing a gypsum product:

[0060] (1) Take tourmaline, grind it by wet grinding method using a planetary ball mill, and dry it to obtain 2000 mesh tourmaline powder; the ball-to-material ratio is 1:3, anhydrous ethanol is used as the ball milling solvent, agate balls are used as the ball milling medium, the filling rate is about 70%, and the time is 25 hours;

[0061] (2) 2.5 parts by weight of tourmaline powder, 4 parts by weight of starch-acrylonitrile graft copolymer, 0.03 parts by weight of sodium citrate and 100 parts by weight of α-gypsum powder were mixed and stirred uniformly to obtain premixed gypsum powder;

[0062] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 between water and premixed gypsum powder, stirring for 25 seconds, and preparing a gypsum slurry;

[0063] (4) Preparing the gypsum slurry into a gypsum product. Comparative Example 2

[0064] A method for preparing a gypsum product:

[0065] (1) taking 100 parts by weight of tourmaline, adding 2 parts by weight of FeO and 1.5 parts by weight of graphite to the tourmaline, grinding the tourmaline by wet grinding using a planetary ball mill, and drying the resulting tourmaline powder to obtain a 2000 mesh modified tourmaline powder;

[0066] The ball-to-material ratio was 1:3, anhydrous ethanol was used as the ball-milling solvent, agate balls were used as the ball-milling medium, the filling rate was about 70%, and the milling time was 25 h.

[0067] (2) 2.5 parts by mass of modified tourmaline powder and 100 parts by mass of α-gypsum powder are mixed and stirred uniformly to obtain premixed gypsum powder;

[0068] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 between water and premixed gypsum powder, stirring for 25 seconds, and preparing a gypsum slurry;

[0069] (4) Preparing the gypsum slurry into a gypsum product. Comparative Example 3

[0070] (1) Take 100 parts by mass of tourmaline, add 2 parts by mass of FeO and 1.5 parts by mass of graphite to the tourmaline, and stir evenly.

[0071] (2) 2.5 parts by mass of modified tourmaline powder, 4 parts by mass of starch-acrylonitrile graft copolymer, 0.03 parts by mass of sodium citrate and 100 parts by mass of α-gypsum powder were mixed and stirred uniformly to obtain premixed gypsum powder;

[0072] (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 between water and premixed gypsum powder, stirring for 25 seconds, and preparing a gypsum slurry;

[0073] (4) Preparing the gypsum slurry into a gypsum product.

[0074] The gypsum products prepared in the above examples 1-3 and comparative examples 1-3 were tested, and the results are shown in Table 1 below:

[0075] Table 1

[0076]

[0077] By testing the number of negative ion unit spaces of Examples 1-3 and Comparative Examples 1-3, it is found that, compared with Comparative Example 1, the embodiment of the present invention adds FeO and graphite to modify the tourmaline, which promotes the generation and transmission of free electrons in the tourmaline, and the generation of negative ions is significantly improved. Compared with Comparative Example 2, the addition of water-retaining resin in the embodiment of the present invention significantly increases the amount of negative ions generated, indicating that the utilization rate of electrons generated by tourmaline has been greatly improved, verifying the existence of water molecules, increasing the combination of electrons and water in the environment, thereby generating more negative ions. Compared with Comparative Example 3, the influence of the specific surface area of ​​tourmaline powder on the release of negative ions is verified. The present invention increases the specific surface area of ​​tourmaline by grinding, increases the distribution uniformity of tourmaline in gypsum slurry, promotes the increase of the dispersed points of tourmaline in gypsum products, thereby increasing the points where negative ions occur, and increasing the transmission channels of negative ions, thereby improving the generation efficiency of negative ions.

Claims

1. A method for preparing a gypsum product with a negative ion releasing function, characterized in that: include: (1) Based on the mass of tourmaline, 1-3% FeO and 0.5-2.5% graphite are added to the tourmaline, and the mixture is wet-milled using a planetary ball mill and dried to obtain 2000-mesh modified tourmaline powder; (2) Based on the mass of α-gypsum powder, 1-5% of modified tourmaline powder, 2-5% of water-retaining resin, and 0.01-0.05% of sodium citrate are mixed and stirred evenly with the α-gypsum powder to obtain premixed gypsum powder; The water-retaining resin includes any one of polyacrylic acid salt, starch acrylate polymer, starch-acrylonitrile graft copolymer, and acrylamide-acrylonitrile-acrylic acid terpolymer; (3) adding the premixed gypsum powder to the weighed water in a mass ratio of 35:100 of water to premixed gypsum powder, stirring for 20-30 seconds to prepare a gypsum slurry; (4) Preparing the gypsum slurry into a gypsum product.

2. The method for preparing a gypsum product with a negative ion releasing function according to claim 1, characterized in that: In step (1), the ball-to-material ratio is 1:3, anhydrous ethanol is used as the ball milling solvent, agate balls are used as the ball milling medium, the filling rate is 70-90%, and the grinding time is 25-35 hours.

3. A gypsum product prepared by the method according to claim 1 or 2.