Modified graphene gelling admixture for building wall putty and preparation method thereof

Abstract

The present invention relates to the field of building materials technology and proposes a modified graphene gelling admixture for building wall putty. The admixture comprises the following raw materials by weight: 40-50 parts quartz powder, 6-10 parts modified graphene, 2-4 parts lignocellulose, 2-4 parts flocculant, and 1-2 parts hydrophobic agent. The modified graphene is graphene modified with 1-carboethyl 2-hydroxypropionate. This technical solution solves the problems of existing building wall putty, such as easy shedding and cracking, and difficulty in construction in low-temperature environments.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to a modified graphene gelling admixture for building wall putty and a preparation method thereof. Background Art

[0002] Wall putty is a building material used to smooth plasterboard and concrete walls, filling cracks and dents on the wall surface for a smoother and more aesthetically pleasing finish. However, traditional wall putty coatings are prone to cracking and flaking during use due to their high coating hardness, low strength, and insufficient toughness. Graphene possesses excellent mechanical and thermal properties, and its addition to paints significantly improves tensile strength, toughness, low-temperature resistance, and durability. However, graphene's unique layer structure, characterized by large π bonds between layers, leads to electrostatic interactions when the layers are very close together, causing them to aggregate. Furthermore, the resulting van der Waals forces and spatial constraints of close proximity can lead to graphene aggregation. This aggregation of graphene itself results in uneven dispersion in the paint, resulting in lower toughness, cracking, and flaking. Summary of the Invention

[0003] The present invention provides a modified graphene gelling admixture for building wall putty and a preparation method thereof, which solves the problems in the related art that building wall putty is easy to crack and fall off and is difficult to construct in a low-temperature environment.

[0004] The technical solutions of the present invention are as follows:

[0005] The present invention provides a modified graphene gelling admixture for building wall putty, comprising the following raw materials in parts by weight: 40-50 parts of quartz powder, 6-10 parts of modified graphene, 2-4 parts of wood cellulose, 2-4 parts of flocculant, and 1-2 parts of water repellent;

[0006] The modified graphene is obtained by modifying graphene with 2-hydroxypropionic acid-1-carbonylethyl ester.

[0007] As a further technical solution, the mass of the modified 2-hydroxypropionic acid-1-carbonylethyl ester is 4% to 6% of the mass of the graphene.

[0008] As a further technical solution, the mass of the modified 2-hydroxypropionic acid-1-carbonylethyl ester is 5% of the mass of the graphene.

[0009] As a further technical solution, the method for preparing the modified graphene includes the following steps: adding graphene to an ethanol solution and dispersing it evenly, then adding 2-hydroxypropionic acid-1-carbonylethyl ester to modify it and obtain modified graphene.

[0010] As a further technical solution, the modification temperature is 30-40° C., and the modification time is 2-3 hours.

[0011] As a further technical solution, the ethanol solution consists of anhydrous ethanol and water in a volume ratio of 4:1.

[0012] As a further technical solution, the flocculant is one or both of polyacrylamide and sodium polyacrylate.

[0013] As a further technical solution, the water repellent is one or more of polysiloxane, sodium methylsiliconate, and water repellent BS4004.

[0014] The present invention also includes a method for preparing a modified graphene gelling admixture for building wall putty, comprising the following steps: uniformly mixing the raw materials to obtain the modified graphene gelling admixture.

[0015] The working principle and beneficial effects of the present invention are:

[0016] 1. In the present invention, adding graphene modified with 2-hydroxypropionic acid-1-ethyl carboxylate to the modified graphene gelling admixture not only prevents graphene agglomeration but also improves the bonding strength, dynamic cracking resistance, and low-temperature hydration resistance of the wall putty. Furthermore, adding wood cellulose to the modified graphene gelling admixture not only improves the anti-sag performance of the wall putty but also forms a network structure with the modified graphene, further preventing graphene agglomeration, thereby further enhancing the bonding strength and dynamic cracking resistance of the wall putty. Therefore, the modified graphene gelling admixture of the present invention can solve the problem of easy cracking and falling off of building wall putty, and utilize the unique thermal effect of graphene to prevent the wall putty from hydrolyzing even at -15°C, thus having excellent low-temperature workability. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0018] In the following examples and comparative examples:

[0019] The model of quartz powder is 325 mesh, and the manufacturer is Hebei Zongrun Mineral Products Co., Ltd.

[0020] The graphene particle size is 7~12μm, and the manufacturer is Shandong Xiangzhao New Materials Co., Ltd.

[0021] The product number of wood cellulose is 0013692, and the manufacturer is Lingshou County Jiashuo Building Materials Processing Co., Ltd.

[0022] The mesh size of polyacrylamide is 25~80mm, and the manufacturer is Henan Shuichengfang Water Purification Materials Co., Ltd.

[0023] The model of polyvinyl alcohol is PVA1788, and the manufacturer is Wuhan Runxingyuan Technology Co., Ltd.

[0024] Polysiloxane, manufactured by Sichuan Shangqing Xinrui Environmental Protection Technology Co., Ltd.

[0025] The model of sodium polyacrylate is 0687, and the manufacturer is Renqiu Shuangcheng Chemical Products Factory;

[0026] The model of carboxymethyl cellulose is 231 mesh, and the manufacturer is Renqiu Shuangcheng Chemical Products Factory;

[0027] The model of sodium methylsiliconate is 103, and the manufacturer is Guangdong Huolun Building Materials Technology Development Co., Ltd.

[0028] The ethanol solution consists of anhydrous ethanol and water in a volume ratio of 4:1.

[0029] Example 1

[0030] A method for preparing a modified graphene gelling admixture for building wall putty comprises the following steps:

[0031] 40 parts of quartz powder, 6 parts of modified graphene, 2 parts of wood cellulose, 2 parts of polyacrylamide, and 1 part of polysiloxane were added into a high-speed mixer and stirred at 900 rpm for 5 hours to obtain a modified graphene gelling admixture.

[0032] The preparation method of modified graphene comprises the following steps:

[0033] 20 g of graphene was added to 500 mL of ethanol solution, and after ultrasonic treatment for 30 min, 1 g of 2-hydroxypropionic acid-1-carbonylethyl ester was added, and the mixture was modified at 30° C. for 3 h and dried to obtain modified graphene.

[0034] Example 2

[0035] A method for preparing a modified graphene gelling admixture for building wall putty comprises the following steps:

[0036] 45 parts of quartz powder, 8 parts of modified graphene, 3 parts of wood cellulose, 3 parts of sodium polyacrylate, and 1.5 parts of sodium methyl siliconate were added into a high-speed mixer and stirred at 950 rpm for 4.5 hours to obtain a modified graphene gelling admixture.

[0037] The preparation method of modified graphene comprises the following steps:

[0038] 20 g of graphene was added to 500 mL of ethanol solution, and after ultrasonic treatment for 30 min, 1 g of 2-hydroxypropionic acid-1-carbonylethyl ester was added, and the mixture was modified at 35° C. for 2.5 h and dried to obtain modified graphene.

[0039] Example 3

[0040] A method for preparing a modified graphene gelling admixture for building wall putty comprises the following steps:

[0041] 50 parts of quartz powder, 10 parts of modified graphene, 4 parts of wood cellulose, 4 parts of sodium polyacrylate, and 2 parts of sodium methyl siliconate were added into a high-speed mixer and stirred at 1000 rpm for 4 hours to obtain a modified graphene gelling admixture.

[0042] The preparation method of modified graphene comprises the following steps:

[0043] 20 g of graphene was added to 500 mL of ethanol solution, and after ultrasonic treatment for 30 min, 1 g of 2-hydroxypropionic acid-1-carbonylethyl ester was added, and the mixture was modified at 40° C. for 2 h and dried to obtain modified graphene.

[0044] Example 4

[0045] The only difference between this embodiment and embodiment 1 is that 0.8 g of 1-carbonylethyl 2-hydroxypropionate is added.

[0046] Example 5

[0047] The only difference between this embodiment and embodiment 1 is that 1.2 g of 1-carbonylethyl 2-hydroxypropionate is added.

[0048] Example 6

[0049] The only difference between this embodiment and embodiment 1 is that 0.6 g of 1-carbonylethyl 2-hydroxypropionate is added.

[0050] Example 7

[0051] The only difference between this embodiment and embodiment 1 is that 1.4 g of 1-carbonylethyl 2-hydroxypropionate is added.

[0052] Comparative Example 1

[0053] The only difference between this comparative example and Example 1 is that the modified graphene is replaced by an equal amount of graphene.

[0054] Comparative Example 2

[0055] The only difference between this comparative example and Example 1 is that no lignocellulose is added.

[0056] Comparative Example 3

[0057] Compared with Example 1, the only difference between this comparative example and Example 1 is that 2-hydroxypropionic acid-1-carbonylethyl ester is replaced by an equal amount of KH550.

[0058] Performance testing:

[0059] The modified graphene gelling admixtures obtained in Examples 1 to 7 and Comparative Examples 1 to 3 were added to putty powder at a rate of 1.5% by weight (the putty powder used had a fineness of 80-100 mesh and was manufactured by Guangxi Jiadeli New Materials Manufacturing Co., Ltd.). The bonding strength, dynamic crack resistance, and low-temperature storage stability (-15°C, 4 h) were measured in accordance with the methods in JG / T 157-2009 "Putty for Building Exterior Walls". The test results are shown in Table 1.

[0060] Table 1 Test results of modified graphene gelling admixtures obtained in Examples 1 to 7 and Comparative Examples 1 to 3

[0061]

[0062] In the present invention, compared with Example 1, Comparative Example 1 replaces the modified graphene with an equal amount of graphene, Comparative Example 2 does not add cellulose, and Comparative Example 3 replaces 2-hydroxypropionic acid-1-carbonylethyl ester with an equal amount of KH550. As a result, the bonding strength and dynamic crack resistance in Comparative Examples 1 to 3 are reduced, and when added and used at -15°C, Comparative Example 1 shows caking and coagulation phenomena, Comparative Example 2 shows a small amount of caking and coagulation phenomena, and Comparative Example 3 shows a very small amount of caking and coagulation phenomena, indicating that adding modified graphene and cellulose to wall putty, and the modified graphene is obtained by modifying graphene with 2-hydroxypropionic acid-1-carbonylethyl ester, can improve the bonding strength, dynamic crack resistance and low-temperature hydration stability of building coatings, thereby solving the problems of easy cracking and falling off of building wall putty and difficult construction in low-temperature environments.

[0063] Compared with Example 1, Examples 4 to 7 changed the mass ratio of 2-hydroxypropionic acid-1-carbonylethyl ester to graphene. As a result, the bonding strength, dynamic crack resistance and low-temperature hydration stability in Examples 1 and Examples 4 to 5 were higher than those in Examples 6 to 7, indicating that when the mass of 2-hydroxypropionic acid-1-carbonylethyl ester is 4% to 6% of the mass of graphene, the bonding strength, dynamic crack resistance and low-temperature hydration stability of the wall putty can be further improved, and the bonding strength and dynamic crack resistance in Example 1 are higher than those in Examples 4 to 5, indicating that when the mass of 2-hydroxypropionic acid-1-carbonylethyl ester is 5% of the mass of graphene, the bonding strength and dynamic crack resistance of the wall putty can be further improved.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A modified graphene gelling admixture for building wall putty, characterized in that: The raw materials include the following components in parts by weight: 40-50 parts of quartz powder, 6-10 parts of modified graphene, 2-4 parts of wood cellulose, 2-4 parts of flocculant, and 1-2 parts of hydrophobic agent; the modified graphene is obtained by modifying graphene with 2-hydroxypropionic acid-1-ethyl ester; The mass of the 2-hydroxypropionic acid-1-carbonyl ethyl ester is 4% to 6% of the mass of the graphene. The method for preparing the modified graphene comprises the following steps: adding the graphene to an ethanol solution and dispersing it uniformly, then adding the 2-hydroxypropionic acid-1-carbonyl ethyl ester to modify the graphene to obtain the modified graphene; The modification temperature is 30-40° C., and the modification time is 2-3 hours.

2. A modified graphene gelling admixture for building wall putty according to claim 1, characterized in that, The flocculant is one or both of polyacrylamide and sodium polyacrylate.

3. A modified graphene gelling admixture for building wall putty according to claim 1, characterized in that, The water repellent is one or more of polysiloxane, sodium methylsiliconate, and water repellent BS4004.

4. according to the preparation method of a kind of building wall putty modified graphene gelling admixture described in any one of claim 1~3, it is characterized in that, The method comprises the following steps: uniformly mixing the raw materials to obtain a modified graphene gelling admixture.

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