Single-component reactive joint mixture and preparation method thereof

Abstract

The invention discloses a single-component reactive joint mixture and a preparation method thereof. The coating is mainly prepared from the following raw materials: moisture curing type organic silicon emulsion, fumed silica, a flow stopping agent, a coupling agent, a de-foaming agent, an anti-corrosion and anti-mildew agent, pigment and filler. In order to solve the problems of slow hydration, easy powder falling, easy yellowing, easy smudginess adsorption, mould breeding, low hardness, insufficient strength and the like of a joint filling product, a moisture curing type organic silicon emulsion is adopted as a main binder, and a polymer chain can be effectively crosslinked into a three-dimensional network structure through reaction with moisture in air in the curing process, so that the joint filling effect is improved. Therefore, the mechanical strength, the water resistance, the stain resistance and the like of the joint mixture are remarkably improved, and the joint mixture does not yellow, can be used after being separated from a barrel, and is excellent in construction efficiency and hand feeling.

Description

Technical Field

[0001] This invention belongs to the field of building decoration materials, specifically relating to a single-component reactive sealant and its preparation method. Background Technology

[0002] Grouting for ceramic tiles, stone, and other decorative materials is a crucial part of building decoration projects. The performance of grout directly affects the overall aesthetics, durability, and environmental friendliness, while ease of application is also an important component of market demand.

[0003] Currently, grouting products on the market are mainly classified into cement-based grouts, single-component emulsion-based grouts, and two-component epoxy grouts based on their chemical systems. Cement-based grouts use silicate cement as the main cementing material, and their advantages include readily available raw materials and low cost. However, their disadvantages include slow hydration, easy powdering, and easy absorption of dirt and mold growth. Single-component emulsion-based grouts rely on drying to form a film. Although convenient, safe, and environmentally friendly, the physical film formed by the emulsion system has low hardness and insufficient strength, making it difficult to meet the performance requirements of grouting applications. Two-component epoxy grouts, through the cross-linking reaction between epoxy resin and curing agent, endow the material with extremely high hardness, wear resistance, and stain resistance. However, their disadvantages are also prominent: the material is prone to photo-oxidation leading to yellowing, and amine curing agents may cause skin allergies. Summary of the Invention

[0004] Overcoming the above shortcomings, this invention provides a single-component reactive sealant and its preparation method. This single-component reactive sealant uses a moisture-curing silicone emulsion as the main binder. Its curing process involves reacting with moisture in the air, which effectively crosslinks the polymer chains into a three-dimensional network structure, thereby significantly improving the sealant's mechanical strength, water resistance, stain resistance, and other properties. It also does not yellow, is ready to use immediately after opening the container, and offers excellent construction efficiency and feel.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A single-component reactive sealant, characterized in that it is mainly composed of the following raw materials in the following mass ratios:

[0007] 20-30 parts of moisture-curing silicone emulsion

[0008] 3-5 parts of fumed silica

[0009] 0.5-1 part of anti-drip agent

[0010] 0.5-1 part coupling agent

[0011] 0.1-0.5 parts of defoamer

[0012] 0.5-2 parts of preservative and mildew inhibitor

[0013] 1-2 parts of pigment

[0014] 60-74.4 parts of filler;

[0015] Furthermore, the fumed silica is hydrophobic fumed silica.

[0016] Furthermore, the pigment is titanium dioxide.

[0017] Furthermore, the filler is glass microspheres.

[0018] Furthermore, the method for preparing a single-component reactive sealant is characterized by comprising the following steps performed sequentially:

[0019] (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, pigment and filler to the container, and stir at a dispersion rate of 800-900 r / min until the system is a mixture without obvious particles.

[0020] (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing when the vacuum reaches -0.1MPa, stir for 30-60 minutes and then stop stirring to form a single-component reactive sealant.

[0021] Furthermore, the single-component reactive sealant obtained in step (2) is sealed and stored.

[0022] The advantages of this invention are:

[0023] The main adhesive of this invention uses a moisture-curing silicone emulsion. During the curing process, the silanol groups generated can not only condense with themselves, but also react with hydroxyl groups and other groups on the surface of the substrate to form a strong covalent bond, thereby achieving chemical anchoring and having higher hardness and bonding strength. At the same time, the silicon-oxygen-silicon main bonds that constitute the main chain are long and have large bond angles, and the molecular chains are easy to rotate, providing the material with a certain degree of flexibility. Specific implementation methods

[0024] The exemplary embodiments of the present invention are described in more detail below. These embodiments are intended to provide a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art. While exemplary embodiments of the present invention are shown, it should be understood that the invention should not be limited to the embodiments set forth herein.

[0025] The raw materials and their brands used in the embodiments and comparative examples of this invention are as follows:

[0026] The moisture-curing silicone emulsion was purchased from Kehuai Resin.

[0027] Fumed silica was purchased from Cabot CAB-O-SIL M5 and LM150;

[0028] The anti-flow agent was purchased from Baianxing 1077;

[0029] The coupling agent was purchased from Shandong Silicon Science & Technology Co., Ltd. (KH-550).

[0030] The defoamer was purchased from TEGO 900.

[0031] The preservative and antifungal agent was purchased from Tor Actiide Ew Paste;

[0032] Titanium dioxide was purchased from DuPont R-706;

[0033] The glass microspheres were purchased from Zhaotong Glass & Plastic.

[0034] Example 1:

[0035] The single-component reactive sealant in this embodiment is composed of the following raw materials in parts by weight:

[0036] 20 parts of moisture-curing silicone emulsion

[0037] 3 parts of fumed silica

[0038] 0.5 parts of anti-drip agent

[0039] 0.5 parts coupling agent

[0040] 0.1 parts defoamer

[0041] 0.5 parts of preservative and mildew inhibitor

[0042] 1 part titanium dioxide

[0043] 74.4 parts of glass microspheres.

[0044] The preparation method of the single-component reactive sealant in this embodiment is as follows:

[0045] (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, titanium dioxide and glass microspheres to the container, and stir at a dispersion rate of 800 r / min until the system is a mixture without obvious particles.

[0046] (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing when the vacuum reaches -0.1MPa, stop stirring after 30 minutes to form a single-component reactive sealant.

[0047] (3) The single-component reactive sealant obtained in step (2) is sealed and stored.

[0048] Example 2:

[0049] The single-component reactive sealant in this embodiment is composed of the following raw materials in parts by weight:

[0050] 25 parts of moisture-curing silicone emulsion

[0051] 4 parts of fumed silica

[0052] 0.5 parts of anti-drip agent

[0053] 1 part coupling agent

[0054] 0.2 parts defoamer

[0055] 1 part of preservative and mildew inhibitor

[0056] 2 parts titanium dioxide

[0057] 66.3 parts of glass microspheres.

[0058] The preparation method of the single-component reactive sealant in this embodiment is as follows:

[0059] (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, titanium dioxide and glass microspheres to the container, and stir at a dispersion rate of 850 r / min until the system is a mixture without obvious particles.

[0060] (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing when the vacuum reaches -0.1MPa, stop stirring after stirring for 45 minutes to form a single-component reactive sealant.

[0061] (3) The single-component reactive sealant obtained in step (2) is sealed and stored.

[0062] Example 3:

[0063] The single-component reactive sealant in this embodiment is composed of the following raw materials in parts by weight:

[0064] 30 parts of moisture-curing silicone emulsion

[0065] 5 parts of fumed silica

[0066] 1 part of anti-drip agent

[0067] 0.75 parts coupling agent

[0068] 0.3 parts defoamer

[0069] 2 parts of preservative and mildew inhibitor

[0070] 1 part titanium dioxide

[0071] 60 parts of glass microspheres.

[0072] The preparation method of the single-component reactive sealant in this embodiment is as follows:

[0073] (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, titanium dioxide and glass microspheres to the container, and stir at a dispersion rate of 900 r / min until the system is a mixture without obvious particles.

[0074] (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing when the vacuum reaches -0.1MPa, stop stirring after 60 minutes to form a single-component reactive sealant.

[0075] (3) The single-component reactive sealant obtained in step (2) is sealed and stored.

[0076] Example 4:

[0077] The single-component reactive sealant in this embodiment is composed of the following raw materials in parts by weight:

[0078] 25 parts of moisture-curing silicone emulsion

[0079] 4 parts of fumed silica

[0080] 0.75 parts of anti-drip agent

[0081] 0.5 parts coupling agent

[0082] 0.4 parts defoamer

[0083] 1.5 parts of preservative and mildew inhibitor

[0084] 2 parts titanium dioxide

[0085] 65.9 parts of glass microspheres.

[0086] The preparation method of the single-component reactive sealant in this embodiment is as follows:

[0087] (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, titanium dioxide and glass microspheres to the container, and stir at a dispersion rate of 800 r / min until the system is a mixture without obvious particles.

[0088] (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing when the vacuum reaches -0.1MPa, stop stirring after 30 minutes to form a single-component reactive sealant.

[0089] (3) The single-component reactive sealant obtained in step (2) is sealed and stored.

[0090] Example 5:

[0091] The single-component reactive sealant in this embodiment is composed of the following raw materials in parts by weight:

[0092] 20 parts of moisture-curing silicone emulsion

[0093] 3 parts of fumed silica

[0094] 1 part of anti-drip agent

[0095] 1 part coupling agent

[0096] 0.5 parts defoamer

[0097] 0.5 parts of preservative and mildew inhibitor

[0098] 1.5 parts titanium dioxide

[0099] 72.5 parts of glass microspheres.

[0100] The preparation method of the single-component reactive sealant in this embodiment is as follows:

[0101] (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, titanium dioxide and glass microspheres to the container, and stir at a dispersion rate of 900 r / min until the system is a mixture without obvious particles.

[0102] (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing when the vacuum reaches -0.1MPa, stop stirring after stirring for 45 minutes to form a single-component reactive sealant.

[0103] (3) The single-component reactive sealant obtained in step (2) is sealed and stored.

[0104] To demonstrate the beneficial effects of the present invention, the following comparative examples are provided based on the above embodiments:

[0105] Comparative Example 1:

[0106] The difference between this comparative example and Example 1 is that an acrylic emulsion was used instead of a moisture-curing silicone emulsion.

[0107] Comparative Example 2:

[0108] The difference between this comparative example and Example 1 is that a polyurethane resin emulsion was used instead of a moisture-curing silicone emulsion.

[0109] Comparative Example 3:

[0110] BNENDA CG2WAS cement-based sealant.

[0111] Comparative Example 4:

[0112] Leidi SP1 Single Component Colored Sand Grout.

[0113] Comparative Example 5:

[0114] Ruisi Pure Hydrogenated Epoxy Colored Sand Grout in Drums

[0115] Samples obtained from all embodiments and comparative examples were tested. The testing methods and standards are as follows:

[0116] Hardness: Tested according to GB / T2411;

[0117] Bond strength and elongation at break: Tested according to GB / T50728-2011;

[0118] Water resistance: Tested according to GB / T50728-2011;

[0119] Yellowing resistance: Tested according to GB / T 23983-2009;

[0120] Stain resistance: Tested according to GB / T 50728-2011.

[0121] To demonstrate the effect of the type of resin emulsion on the performance of the sealant in this application, the performance indicators of the samples from Example 1 and Comparative Examples 1 and 2 were tested, and the test results are shown in the table below:

[0122]

[0123] As shown in the table above, the main adhesive used in the sealant is a moisture-curing silicone emulsion, which has higher hardness, bonding strength, and better flexibility compared to acrylic emulsions or polyurethane resin emulsions. This is because the silanol groups generated during the curing process of the moisture-curing silicone emulsion can not only condense with itself but also react with hydroxyl groups and other groups on the substrate surface to form strong covalent bonds, thereby achieving chemical anchoring. At the same time, the silicon-oxygen-silicon main bonds constituting its main chain are long and have large bond angles, and the molecular chains are easy to rotate, providing the material with a certain degree of flexibility.

[0124] To demonstrate the advantages of this application in terms of product performance and construction compared to similar products, samples from Examples 1-5 and Comparative Examples 3-5 were tested, and the test results are shown in the table below:

[0125]

[0126] In the performance comparison table above, the single-component reactive sealant prepared in Examples 1-5 of this invention emits less odor and is more environmentally friendly and safer than the amine odor of Comparative Example 5. In terms of hardness, it is stronger than Comparative Examples 3, 4, and 5, exhibiting high wear resistance. In terms of bonding strength, it is higher than Comparative Examples 3, 4, and 5. Comparative Example 3 has poor water resistance due to its slow hydration and curing process; Comparative Example 5 has poor resistance to yellowing due to the characteristics of its epoxy system; and Comparative Examples 3 and 4 have porous and rough surfaces, resulting in poor stain resistance.

[0127] Regarding workability, the single-component reactive sealant prepared in Examples 1-5 of this invention can be applied directly without mixing, exhibiting good thixotropy and storage stability. Comparative Example 4, however, gradually dries and hardens over time. Comparative Examples 3 and 5 require on-site mixing and preparation, posing a construction risk. Comparative Example 4, being relatively thick, feels heavy during application and is prone to spilling material when filling wide gaps, making it difficult to apply.

[0128] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-component reactive sealant, characterized in that: It is mainly composed of the following raw materials in the following mass ratios: 20-30 parts of moisture-curing silicone emulsion 3-5 parts of fumed silica 0.5-1 part of anti-drip agent 0.5-1 part coupling agent Defoamer 0.1-0.5 parts 0.5-2 parts of preservative and mildew inhibitor 1-2 parts of pigment 60-74.4 parts of packing material.

2. The single-component reactive sealant according to claim 1, characterized in that: The fumed silica is hydrophobic fumed silica.

3. The single-component reactive sealant according to claim 1, characterized in that: The pigment is titanium dioxide.

4. The single-component reactive sealant according to claim 1, characterized in that: The filler is glass microspheres.

5. A method for preparing a single-component reactive sealant as described in any one of claims 1-4, characterized in that: The following steps are performed sequentially: (1) Add moisture-curing silicone emulsion, fumed silica, anti-flow agent, coupling agent, defoamer, preservative and mildew inhibitor, pigment and filler to the container, and stir at a dispersion rate of 800-900 r / min until the system is a mixture without obvious particles. (2) Close the feeding port and vent valve, turn on the vacuum pump and vacuum valve, start timing after the vacuum reaches -0.1MPa, stir for 30-60 minutes and then stop stirring to form a single-component reactive sealant.

6. The method for preparing a single-component reactive sealant according to claim 5, characterized in that: The single-component reactive sealant obtained in step (2) is sealed and stored.

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