Modified redispersible latex powder and corresponding floor tile adhesive composition, self-leveling floor tile adhesive and preparation method thereof

Abstract

The invention discloses a modified redispersible latex powder and a corresponding floor tile adhesive composition, a self-leveling floor tile adhesive and a preparation method thereof; the modified redispersible latex powder is prepared from a modified composition comprising 5-10% of a retarder modifier, 5-10% of a rheology modifier, 8-15% of an anti-shrinkage agent and 65-80% of a dispersible latex powder; the content of each component is based on the weight of the modified composition; the sum of the weight percentages of each component in the modified composition is 100%, based on the weight of the modified composition. The floor tile adhesive comprising the modified redispersible latex powder of the present invention has good and controllable leveling properties and good bonding strength; the preparation method thereof is easy to operate and has a simple process.

Description

Technical Field

[0001] The invention relates to the field of building materials, in particular to modified redispersible latex powder and corresponding floor tile adhesive composition, self-leveling floor tile adhesive and a preparation method thereof. Background Art

[0002] Tile adhesive is a high-quality polymer-modified adhesive based on Portland cement that can adhere tiles to a variety of substrates. Tile adhesive eliminates the need to wet tiles before attaching them to walls and floors. Its long curing time allows for ample adjustment time. Furthermore, tile adhesive boasts a wide application range, is easy to apply, and offers strong adhesion.

[0003] Currently, tile adhesives are primarily used for laying tiles on walls and floors. Traditionally, no distinction has been made between wall and floor tile adhesives; the same adhesive is used for both. Therefore, considering the specific construction conditions of floors, it is necessary to conduct in-depth research on tile adhesives suitable for floors. Summary of the Invention

[0004] In view of this, the present invention provides a modified redispersible latex powder and a corresponding floor tile adhesive composition, a self-leveling floor tile adhesive and a preparation method thereof; the floor tile adhesive containing the modified redispersible latex powder has good and controllable leveling properties and excellent bonding strength; and the preparation method thereof is easy to operate and has a simple process.

[0005] The present invention provides the following technical solutions:

[0006] A modified redispersible latex powder, characterized in that it is prepared from a modified composition comprising 5-10% of a retarding modifier, 5-10% of a rheology modifier, 8-15% of an anti-cratering agent, and 65-80% of a dispersible latex powder; the content of each component is based on the weight of the modified composition; and the sum of the weight percentages of the components in the modified composition is 100%, based on the weight of the modified composition.

[0007] The present invention provides the following non-conventional alternatives:

[0008] The retarding setting modifier includes one or more of the following: tartaric acid, sodium citrate, glucose; the rheology modifier includes one or more of the following: melamine, polycarboxylic acid and its salt, lignin sulfonate; and the anti-cratering agent includes one or more of the following: silicone anti-cratering agent, fatty acid salt.

[0009] The average particle size of the modified redispersible latex powder is 150-300 meshes.

[0010] The present invention provides a floor tile adhesive composition, which comprises 25-35% of Portland cement, 1-5% of aluminate cement, 1-5% of gypsum, 55-65% of quartz sand, 3-5% of the modified redispersible latex powder according to any one of claims 1 to 3, and 0.1-0.3% of cellulose ether, based on the weight of the floor tile adhesive composition.

[0011] The present invention provides the following non-conventional alternatives:

[0012] The aluminate cement includes one or more of the following: sulphoaluminium cement and high alumina cement; the average particle size of the quartz sand is 0.1 mm to 0.6 mm; the viscosity of a 2 wt % aqueous solution of the cellulose ether at 21° C. to 25° C. is 10,000 cP to 30,000 cP.

[0013] The present invention provides a self-leveling floor tile adhesive, which comprises the floor tile adhesive composition according to claim 4 or 5, and a tile adhesive solvent.

[0014] The present invention provides the following non-conventional alternatives:

[0015] The weight ratio of the floor tile adhesive composition to the tile adhesive solvent is 100:(25-35).

[0016] The present invention also provides a method for preparing the self-leveling floor tile adhesive as described above, comprising: mixing a modified composition with a modified solvent to obtain a modified mixture; drying the obtained modified mixture to obtain a modified redispersible latex powder; mixing the obtained modified redispersible latex powder with silicate cement, aluminate cement, gypsum, quartz sand and cellulose ether to obtain a floor tile adhesive composition; and mixing the floor tile adhesive composition with a tile adhesive solvent to obtain a self-leveling floor tile adhesive.

[0017] The present invention provides the following non-conventional alternatives:

[0018] The modified solvent is the same as or different from the tile adhesive solvent, and each independently includes one or more of the following: water, ethanol, and toluene.

[0019] The weight ratio of the modified composition to the modified solvent is (10-20):100.

[0020] According to the technical solution of the present invention, redispersible latex powder is modified with a retarding modifier, a rheology modifier, and an anti-cratering agent to obtain a modified redispersible latex powder. The modified redispersible latex powder is used to prepare a floor tile adhesive having good and controllable leveling properties and the ability to automatically flow to an appropriate thickness. The floor tile adhesive also has good bonding strength. Furthermore, the floor tile adhesive only requires mixing of the components, is easy to operate, and has a simple process. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the examples. Preferred embodiments of the present invention are provided in the examples. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0022] Tile adhesive can compensate for the shortcomings of cement and ordinary polymer mortar. Its excellent waterproofing, adhesion, and durability overcome the drawbacks of ordinary cement, waterproof mortar, or ordinary wall and floor tile adhesives, such as weak tile adhesion, hollowing, cracking, shedding, and water seepage. It demonstrates superior performance in both waterproofing building envelopes and in bonding and waterproofing building finishing materials. Tile adhesive is formulated primarily based on the "organic-inorganic" theory, mixing with an optimized polymer content and strictly controlling the ratio of polymers and other materials. This results in a material that combines the properties of inorganic cement with the high adhesion of organic adhesives, achieving both waterproofing and adhesion.

[0023] At present, tile adhesive is mainly used in the application scenario of laying ceramic tiles on walls and floors. There is no distinction between tile adhesive for walls and tile adhesive for floors, that is, the same tile adhesive is used for walls and floors. When actually used on walls, the tile adhesive used should be thicker and more thixotropic than that used on floors to ensure that the tile adhesive can better adhere to the facade and prevent the tiles from sliding easily, thereby ensuring the effectiveness of tile laying. However, floor tile adhesive does not need to be too viscous. Under the premise of not losing bonding performance, higher fluidity requirements are required to facilitate construction. Traditional floor tile adhesive has poor fluidity and is not smooth when scraped. Therefore, when laying ceramic tiles on the floor, it is necessary to spread the tile adhesive with a spatula. The floor tile adhesive containing modified redispersible latex powder of this embodiment has self-leveling properties, and the leveling properties are controllable, and at the same time has good bonding strength.

[0024] In this embodiment, the floor tile adhesive composition includes 25-35%, for example, 28-30% of Portland cement, 1-5% of aluminate cement, 1-5% of gypsum, 55-65%, for example, 56.7-58.7% of quartz sand, 3-5%, for example, 3-4% of modified redispersible latex powder, and 0.1-0.3% of cellulose ether, based on the weight of the floor tile adhesive composition; the sum of the weight percentages of the components in the floor tile adhesive composition is 100%, based on the weight of the floor tile adhesive composition. The modified redispersible latex powder is prepared from a modified composition comprising 5-10%, for example 8-10%, of a retarding modifier, 5-10%, for example 8-10%, of a rheology modifier, 8-15%, for example 8-10%, of an anti-crater agent, and 65-80%, for example 70-80%, of a dispersible latex powder, wherein the content of each component is based on the weight of the modified composition; the sum of the weight percentages of each component in the modified composition is 100%, based on the weight of the modified composition.

[0025] The redispersible polymer powder can be any commonly used redispersible polymer powder known in the art, such as a redispersible vinyl acetate-ethylene copolymer latex powder, a vinyl acetate / versatate copolymer latex powder, or an acrylic copolymer latex powder, such as a vinyl acetate-ethylene copolymer latex powder or a vinyl acetate / versatate copolymer latex powder. The dispersible polymer powder has a minimum film-forming temperature of 2-6°C and a particle size of 0.5 to 8 microns. The dispersible polymer powder can be 5010N from Wacker, Germany, or 7106V from Guangzhou Jiantubao Building Materials Co., Ltd.

[0026] The retarding modifier includes one or more of the following: tartaric acid, sodium citrate, and glucose, for example, tartaric acid or sodium citrate. The tartaric acid can be industrial-grade dextrorotatory tartaric acid, industrial-grade levorotatory tartaric acid, or industrial-grade mesotartaric acid. The rheology modifier includes one or more of the following: melamine, polycarboxylic acids and their salts, and lignin sulfonates, such as sodium salts. The melamine can be a modified or unmodified resin powder, such as a formaldehyde resin powder, typically having a bulk density of 400-700 kg / cm. 3 The polycarboxylic acid may be a modified or unmodified polycarboxylic acid, which is generally a comb-like copolymer having a hydrophobic linear molecular main chain connected to a plurality of hydrophilic group branches (side chains), and the main chain segment contains hydrophilic groups such as carboxylic acid groups, sulfonic acid groups or amino groups; the polycarboxylic acid and its salts, such as sodium salts, are commercially available or can be prepared by methods known to those skilled in the art. Common methods for preparing polycarboxylic acids and their salts include in-situ polymerization grafting, polymerization followed by functionalization, and direct monomer copolymerization.

[0027] Anti-cratering agents include one or more of the following: organosilicon anti-cratering agents and fatty acid salts; for example, organosilicon anti-cratering agents. Organosilicon anti-cratering agents may include polysiloxane and silica, among other ingredients. Common organosilicon anti-cratering agents include Foamerstar from BASF, P803 from Müller-Hyde, and P801 from Müller-Hyde. Fatty acid salts may be salts of fatty carboxylic acids or fatty sulfonic acids, such as sodium salts, typically C6-C10 alkyl carboxylates such as sodium octanoate, and C10-C14 alkyl sulfonates such as sodium lauryl sulfonate.

[0028] The modified redispersible latex powder is prepared by a method comprising the following steps: mixing a modified composition with a modifying solvent to obtain a modified mixture; and drying the obtained modified mixture to obtain the modified redispersible latex powder.

[0029] The modifying solvent includes one or more of the following: water, ethanol, and toluene; for example, water. The average particle size of the modified redispersible latex powder is 150-300 mesh, for example, 200 mesh. The weight ratio of the modifying composition to the modifying solvent is (10-20):100, for example, 20:100.

[0030] In this embodiment, the modified redispersible latex powder is prepared by a method comprising the following steps: mixing the retarding modifier, rheology modifier, anti-crater agent, and redispersible latex powder in the above proportions to obtain a modified composition; then adding the modified composition into a clean container in 3-4 batches, adding the modifying solvent into the container in the above weight ratio, stirring at a stirring rate of 400-600r / min, for example, 500r / min, for 15-60min, and then ultrasonically mixing at a frequency of 20-60KHZ and a power of 400-800W for 20-60min to obtain a modified mixture; the obtained modified mixture is dried in a 70-90℃ oven under reduced pressure for 10-15 hours, and sieved to obtain a modified redispersible latex powder with an average particle size of 150-300mesh. The retarder modifier, rheology modifier, anti-cratering agent, and redispersible polymer powder are redispersed and mixed, forming a physically cross-linked state. After drying, a uniform modified redispersible polymer powder is formed. This modified redispersible polymer powder exhibits a sustained-release effect, with each component slowly and evenly released. This allows the prepared floor tile adhesive to maintain better stability and fluidity, resulting in a longer application time.

[0031] Portland cement includes one or more of the following: P·II42.5 Portland cement, P·O42.5R ordinary Portland cement, and P·W52.5 white Portland cement. Aluminate cement includes one or more of the following: sulphoaluminate cement and high-alumina cement; for example, sulphoaluminate cement. Sulphoaluminate cement is primarily composed of anhydrous calcium sulphoaluminate (C4A3S) and dicalcium silicate (C2S). According to GB / T 20472-2006, it can be divided into rapid-hardening sulphoaluminate cement, low-alkalinity sulphoaluminate cement, and self-stressing sulphoaluminate cement. High-alumina cement is a hydraulic binder with aluminate as the primary mineral component, containing approximately 50% alumina, based on the total weight of the high-alumina cement.

[0032] The gypsum may be anhydrous gypsum. The average particle size of the quartz sand may be 0.1 mm to 0.6 mm, for example, 0.5 mm. The cellulose ether may include one or more of the following: methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC), and hydroxyethyl cellulose ether (HC). The viscosity of a 2 wt % aqueous solution of the cellulose ether at 21° C. to 25° C. is 10,000 cP to 30,000 cP.

[0033] In this embodiment, the self-leveling floor tile adhesive comprises the floor tile adhesive composition and the tile adhesive solvent, wherein the weight ratio of the floor tile adhesive composition to the tile adhesive solvent is (100):(25-35), for example, 100:30.

[0034] In this embodiment, the method for preparing the self-leveling floor tile adhesive as described above includes: mixing a modified composition with a modified solvent to obtain a modified mixture; drying the obtained modified mixture to obtain a modified redispersible latex powder; mixing the obtained modified redispersible latex powder with silicate cement, aluminate cement, gypsum, quartz sand and cellulose ether to obtain a floor tile adhesive composition; mixing the floor tile adhesive composition with a tile adhesive solvent to obtain a self-leveling floor tile adhesive.

[0035] The tile adhesive solvent and the modifying solvent may be the same as or different from each other, and generally may independently include one or more of the following: water, ethanol, toluene; for example, water.

[0036] In this embodiment, the step of mixing the floor tile adhesive composition with the tile adhesive solvent includes adding the floor tile adhesive composition and the tile adhesive solvent into a mixer that meets the requirements of JC / T 681, and stirring and mixing them at a stirring rate of 500-1000 r / min, thereby obtaining a self-leveling floor tile adhesive.

[0037] In this embodiment, the step of mixing the floor tile adhesive composition with the tile adhesive solvent includes adding the tile adhesive solvent into a mixer that meets the requirements of JC / T 681; then sprinkling the floor tile adhesive composition into the tile adhesive solvent, and stirring and mixing at a stirring rate of 500-1000 r / min to obtain a self-leveling floor tile adhesive.

[0038] The floor tile adhesive of this embodiment is used for laying tiles on the floor; it has good self-leveling properties, reduces construction difficulty, improves construction efficiency, and at the same time ensures bonding strength.

[0039] In this embodiment, the "average particle size" of solid particles such as latex powder and quartz sand refers to the sieve hole size corresponding to 50% cumulative weight percentage on the sieve, which is measured by mechanical method according to GB / T 21524-2008.

[0040] The present invention is described below by way of specific examples. The examples described below are illustrative and are intended only to explain the present invention and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the examples, the methods described in the literature in the art or the product specifications were used. Where the manufacturer of the reagents or instruments used is not specified, they are all commercially available conventional products.

[0041] raw material

[0042] Portland cement: P·O 42.5, purchased from Yangchun Conch Cement Company;

[0043] Aluminate cement: grade 42.5, purchased from Tangshan Polar Bear Building Materials Company;

[0044] Gypsum: anhydrous gypsum, purchased from Huizhou Yongtai Company;

[0045] Quartz sand: particle size distribution is in the range of 40-120 mesh, with an average particle size of 0.5 mm, purchased from Guangdong Aosheng New Materials Co., Ltd.

[0046] Cellulose ether: HD110, with a viscosity of 20,000 cP at 25°C at 2 wt% aqueous solution, purchased from Shandong Heda Company;

[0047] Redispersible latex powder: 5010N, purchased from Wacker, Germany;

[0048] Vinyl acetate / versatate copolymer 7106V was purchased from Guangzhou Jiantubao Building Materials Co., Ltd.

[0049] Retarding setting modifier: tartaric acid, purchased from Henan Hengxincheng Chemical Company;

[0050] Rheology modifier: melamine SM, purchased from Suzhou Xingbang Chemical Building Materials Co., Ltd.;

[0051] Polycarboxylates -325C, purchased from Sika (China) Co., Ltd.;

[0052] Anti-crater agent: silicone anti-crater agent P803, purchased from Mingling Chemical Company, Germany;

[0053] Sodium lauryl sulfate was purchased from Henan Weisheng Chemical Company.

[0054] Example 1

[0055] (1) Preparation of modified redispersible latex powder

[0056] 10 g of tartaric acid, 10 g of melamine, 10 g of silicone anti-crater agent, and 70 g of 5010N redispersible latex powder purchased from Wacker, Germany were mixed to obtain a modified composition; the modified composition was then divided into three batches of equal weight and added into a clean container in batches, and water was added into the container in an amount of 100:20 by weight to the modified composition. The mixture was stirred at a stirring rate of 500 r / min for 30 min, and then ultrasonically mixed at a frequency of 40 kHz and a power of 600 W for 30 min to obtain a modified mixture; the obtained modified mixture was dried in an 80°C oven under reduced pressure for 12 hours, and sieved to obtain 100 g of modified redispersible latex powder with an average particle size of 200 mesh.

[0057] (2) Preparation of floor tile adhesive composition

[0058] 280 g of P·II 42.5 Portland cement, 50 g of aluminate cement, 50 g of gypsum, 587 g of quartz sand with an average particle size of 0.5 mm, 30 g of the modified redispersible latex powder prepared above, and 3 g of cellulose ether were added to a three-dimensional mixer (model (SBH-10, purchased from Dayun Machinery Co., Ltd.) and mixed at a stirring rate of 800 r / min for 2 min to obtain a floor tile adhesive composition.

[0059] (3) Preparation of floor tile adhesive

[0060] 300 g of water was poured into a JJ-5 cement mortar mixer (purchased from Wuxi Jianyi Company) that complies with the requirements of JC / T 681; the floor tile adhesive composition prepared in step (2) was then sprinkled into the water and stirred at a stirring rate of 800 r / min for 30 s. The adhesive mortar on the stirring blade and the pot wall was scraped off within 1 min; the stirring blade was replaced and stirred for another 1 min to fully mix the mixture, thereby obtaining a floor tile adhesive.

[0061] The above compositions and operating conditions are summarized in Tables 1 and 2 below.

[0062] Examples 2-4 and 9-16

[0063] The steps of Examples 2-4 repeat the operating steps of Example 1, except that (1) the preparation conditions and composition of the modified redispersible latex powder are as shown in Tables 1 and 2.

[0064] Examples 5-8 and 17-18

[0065] The steps of Examples 5-8 repeat the operating steps of Example 1, except that the amounts of the components used in (2) and (3) for preparing the floor tile adhesive are as shown in Tables 1 and 2.

[0066] Comparative Example 1

[0067] This comparative example was carried out using steps similar to those of Example 1, except that the step of preparing the modified redispersible latex powder was not performed. In (2) preparing the floor tile adhesive composition, 3 g of tartaric acid, 3 g of melamine, 3 g of an organosilicon anti-cratering agent, and 21 g of 5010N redispersible latex powder purchased from Wacker, Germany were used to replace the modified redispersible latex powder and directly mixed with the other components. For details, see Tables 1 and 2.

[0068] Comparative Example 2

[0069] Comparative Example 2 was carried out using similar steps to Example 1, except that in (2) preparing the floor tile adhesive composition, the amount of modified redispersible latex powder added was 100 g and the amount of quartz sand was 517 g. For details, see Tables 1 and 2.

[0070] Comparative Example 3

[0071] Comparative Example 3 was carried out using similar steps to Example 1, except that 10 g of modified redispersible latex powder and 607 g of quartz sand were added to (2) the preparation of the floor tile adhesive composition. For details, see Tables 1 and 2.

[0072] Comparative Example 4

[0073] Comparative Example 4 was carried out using steps similar to those of Example 1, except that the step of preparing the modified redispersible latex powder was not performed, and no redispersible latex powder was added in (2) preparing the floor tile adhesive composition. For details, see Tables 1 and 2.

[0074] Table 1 Composition and preparation conditions of modified redispersible latex powder in each embodiment

[0075]

[0076]

[0077] Table 2 Composition and preparation conditions of floor tile adhesives of Examples 1 and 18-35 and comparative examples

[0078]

[0079]

[0080] *In Comparative Example 1, 3% refers to the total weight percentage of tartaric acid, melamine, silicone anti-cratering agent and redispersible latex powder.

[0081] Performance Testing

[0082] (1) Liquidity

[0083] The fluidity of the floor tile adhesives of the examples and comparative examples was measured according to GB / T 2419-2005 Cement Mortar Fluidity. Generally, when the fluidity of the tile adhesive is within the range of 200-300 mm, it can be considered that the tile adhesive has good controllable self-leveling properties.

[0084] (2) Bond strength

[0085] The bonding strength of the floor tile adhesives of each embodiment and comparative example was measured according to JC / T 547-2017 Ceramic Tile Adhesives.

[0086] The above performance test results are summarized in Table 3.

[0087] Table 3 Performance of floor tile adhesives in various embodiments and comparative examples

[0088]

[0089]

[0090] As can be seen from Tables 1 to 3, according to the technical solutions of the embodiments of the present invention, the fluidity of the floor tile adhesive of the present invention is more controllable, while taking into account both bonding strength and aging resistance.

[0091] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A floor tile adhesive composition, characterized in that: The floor tile adhesive composition comprises 25-35% of silicate cement, 1-5% of aluminate cement, 1-5% of gypsum, 55-65% of quartz sand, 3-5% of modified redispersible latex powder, and 0.1-0.3% of cellulose ether, based on the weight of the floor tile adhesive composition; The modified redispersible latex powder is prepared from a modified composition comprising 5-10% of a retarder modifier, 5-10% of a rheology modifier, 8-15% of an anti-crater agent, and 65-80% of a dispersible latex powder; the content of each component is based on the weight of the modified composition; the sum of the weight percentages of each component in the modified composition is 100%, based on the weight of the modified composition; The retarding setting modifier includes one or more of the following: tartaric acid, sodium citrate, glucose; the rheology modifier includes one or more of the following: melamine, polycarboxylic acid and its salt, lignin sulfonate; and the anti-cratering agent includes one or more of the following: silicone anti-cratering agent, fatty acid salt.

2. The tile adhesive composition according to claim 1, characterized in that: The average particle size of the modified redispersible latex powder is 150-300 meshes.

3. The tile adhesive composition according to claim 1 or 2, characterized in that: The aluminate cement comprises one or more of the following: sulphoaluminate cement, high alumina cement; the average particle size of the quartz sand is 0.1 mm to 0.6 mm; the viscosity of the cellulose ether at 21° C. to 25° C. in a 2 wt % aqueous solution is 10000 cP to 30000 cP.

4. A self-leveling floor tile adhesive, characterized in that: The invention comprises the floor tile adhesive composition according to any one of claims 1 to 3, and a tile adhesive solvent.

5. The self-leveling floor tile adhesive according to claim 4, characterized in that: The weight ratio of the floor tile adhesive composition to the tile adhesive solvent is 100:(25-35).

6. A method for preparing the self-leveling floor tile adhesive according to claim 4 or 5, characterized in that: include: mixing the modified composition with a modified solvent to obtain a modified mixture; drying the obtained modified mixture to obtain a modified redispersible latex powder; The obtained modified redispersible latex powder is mixed with silicate cement, aluminate cement, gypsum, quartz sand and cellulose ether to obtain a floor tile adhesive composition; The floor tile adhesive composition is mixed with a tile adhesive solvent to obtain a self-leveling floor tile adhesive.

7. The method according to claim 6, characterized in that The modified solvent is the same as or different from the tile adhesive solvent, and each independently includes one or more of the following: water, ethanol, and toluene.

8. The method according to claim 6 or 7, characterized in that: The weight ratio of the modified composition to the modified solvent is (10-20):100.

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