Single-component high-elasticity water-resistant silane modified ceramic tile sealant as well as preparation method and use method of single-component high-elasticity water-resistant silane modified ceramic tile sealant

Abstract

The invention relates to the technical field of building joint sealing materials, in particular to a single-component high-elasticity water-resistant silane modified ceramic tile joint sealing agent as well as a preparation method and a use method thereof. The silane-terminated polymer is used as a main elastic component, the organic silicon resin is used as a cross-linking modifier, the organic tin-amine composite catalytic system is used as a curing accelerator, and the nano-scale compound aggregate is used as a reinforcing filler. Functional auxiliaries such as hydrophobic fumed silica and a UV stabilizer are optionally added, and all the components are emulsified, dispersed and compounded with filler to form a paste system with excellent construction performance. Through the synergistic cross-linking effect of the silane-terminated polymer and the organic silicon resin, the balance of high elasticity, rapid curing, water resistance and weather resistance of the sealant is realized. The preparation process is simple and environment-friendly, the product storage stability is good, and industrial production and construction application are facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building jointing materials, in particular to a single-component high-elasticity water-resistant silane-modified ceramic tile jointing agent and a preparation and use method thereof. BACKGROUND

[0002] As a traditional building sealing technology, the development history of grouting process can be traced back to ancient civilization. As early as in the building ruins of ancient Egypt, Mesopotamia and ancient Rome, the use of lime, gypsum and other mineral-based adhesives for joint treatment has been found. Archaeological evidence shows that early humans have mastered the process of using mineral-based adhesive materials for building joint treatment. These materials not only play a sealing role, but also significantly improve the integrity and durability of masonry structures. With the development of building material science, modern grouting technology has formed a standardized application mode dominated by cement-based systems. In particular since the middle of the twentieth century, silicate cement-based jointing materials have gradually become the mainstream materials for building joint treatment due to their good compressive performance and wide applicability, especially in the joint treatment of ceramic tiles, stone and other facing materials in the field of building decoration.

[0003] Traditional cement-based jointing materials mainly form a silicate network structure dominated by calcium silicate hydrate (C-S-H) through cement hydration reaction, thereby achieving certain mechanical strength and wear resistance. Although this type of material has a wide range of raw materials, simple preparation process and significant cost-effectiveness, it has several inherent defects in actual application. First, its rheological properties exhibit obvious shear thickening behavior, i.e., the viscosity increases sharply when the shear rate during construction increases, making it difficult to pump and uniformly distribute the grouting material. Therefore, it is difficult to use mechanized grouting equipment and must rely on manual scraping operation, resulting in low construction efficiency and poor quality consistency. Second, the interfacial bonding mechanism of the material and the surface of the base material is significantly affected by the crystalline morphology and distribution uniformity of the hydration products, and stress concentration easily occurs under different temperature and humidity conditions, resulting in large dispersion of bonding strength and seriously affecting the long-term reliability of the joint. More importantly, the cement slurry is easily attached to the surface of the facing material during construction, inevitably causing surface contamination, which requires post-processing measures such as acidic chemical cleaning or mechanical physical wiping according to the porosity difference of the base material. This process not only significantly reduces the construction efficiency and increases the labor and time costs, but also may affect the visual aesthetics and physical properties of the final joint due to incomplete cleaning or excessive wiping.

[0004] To overcome the above-mentioned defects, the material science field has proposed various improvement schemes. In the polymer modification technology route, by introducing redispersible polymer particles such as ethylene-vinyl acetate (EVA) or acrylate emulsion into the cement matrix, the synergistic effect of the film-forming properties and the cement hydration products can improve the flexibility, crack resistance and interfacial adhesion properties of the material to some extent. However, this modification method is still essentially a physical blending system, and there is a lack of chemical bonding between the polymer phase and the cement phase, which cannot fundamentally change the intrinsic characteristics of high brittleness and high shrinkage of cement-based materials. In addition, the modified material still retains the construction limitations of traditional cement-based sealants, such as sensitivity to moisture, harsh curing conditions, etc., and is prone to film structure discontinuity or early cracking in high temperature or low humidity environments.

[0005] In the chemical curing type sealant system, synthetic polymer materials represented by epoxy resin and polyurethane exhibit excellent comprehensive performance. This type of material forms a three-dimensional network structure through cross-linking reaction between functional groups, has outstanding mechanical strength, chemical medium resistance and low shrinkage characteristics. However, the two-component system in the prior art has technical bottlenecks such as difficulty in controlling mixing homogeneity and short pot life, and the proportion deviation or insufficient stirring at the construction site can easily lead to incomplete curing or performance fluctuations. At the same time, some epoxy systems may release amine by-products during the curing process, affecting the interfacial adhesion performance and causing pollution to the construction environment. The single-component waterborne epoxy or modified silicone system developed in recent years simplifies the construction process by driving cross-linking with moisture, but due to the wide molecular weight distribution of the film-forming material and the low cross-linking density, the chain segments are prone to degradation or creep under the long-term action of heat and humidity, freeze-thaw or ultraviolet light, leading to performance degradation phenomena such as yellowing, powdering or strength reduction of the material.

[0006] In the face of these challenges, the current research direction has gradually focused on the development of a new generation of sealant materials with controllable rheological behavior, rapid curing characteristics and excellent durability, such as using nano-modification technology and developing high-performance systems based on silane-modified polymers to achieve long-term sealing and structural protection in complex environments.

[0007] On November 19, 2025, with "silane and end and polymer and organic silicon and resin and caulk" as the abstract keywords, check the synonym expansion permission, search in the China patent public database, and no related literature is found.

[0008] On November 19, 2025, "silane and end and polymer and organic silicon and resin and caulk" were searched for abstracts on China's CNKI, and no related literature was found.

[0009] November 19, 2025, a search was conducted on the United States Patent and Trademark Office website under "Silane with End capping with Polymer with Siliconewith Resin with Grout Sealing" and no relevant documents were found; search website https: / / ppubs.uspto.gov / pubwebapp / .

[0010] November 19, 2025, a search was conducted on WIPO's https: / / patentscope2.wipo.int / under "Silane and End capping and Polymer and Silicone and Resin and Grout Sealing" and no relevant documents were found.

[0011] November 19, 2025, a search was conducted on WIPO's https: / / patentscope2.wipo.int / under "Silane and End capping and Polymer and Silicone and Resin and Grout Sealing" and no relevant documents were found.

[0012] and the concept of this patent is completely different. SUMMARY

[0013] The purpose of the invention: In order to provide a single-component high-elasticity water-resistant silane modified ceramic tile sealant with better effect and preparation and use method, the specific purpose is seen in the multiple substantial technical effects of the specific implementation part.

[0014] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: Based on the in-depth analysis of the problems of the prior art, there is an urgent need in the field to develop a new type of filling material, which should have the following innovative features: in terms of material system design, nanometer / micron filler compounding technology is adopted, through the synergistic effect of nanometer calcium carbonate and graded silicate, the defects of easy settlement and large shrinkage of traditional materials are effectively solved; in terms of resin matrix modification, MQ-T organic silicon resin containing active groups is introduced, which significantly improves the flexibility of the material while maintaining high crosslinking density, breaking through the technical bottleneck of traditional silane sealant "high strength and brittle"; in terms of construction performance optimization, a composite catalyst system is used to balance the storage stability and rapid curing performance; in terms of durability improvement, a combination of hydrophobic silicon dioxide and UV stabilizer is used to ensure that the material can maintain excellent color stability in long-term immersion or ultraviolet radiation environment.

[0015] In order to achieve the above object, the present application adopts the following technical solutions: The single-component high-elasticity water-resistant silane-modified ceramic tile caulk, characterized in that the premixed composition comprises the following components: a silane-terminated polymer, an organosilicon resin, an emulsifier, water, an aggregate filler, a catalyst, and an additive.

[0016] The silane-terminated polymer has a structure of Y[(CR 12 ) 1~10 SiR a (OR2) 1~3 ] 1~10 wherein Y is a polyurethane group or a polyoxyalkylene polymer group, and is bonded to CR 1 2 through N, O, S, C, etc.; R, R 1 , and R 2 are H or an optionally substituted monovalent hydrocarbon group (alkyl, alkenyl, alkynyl, aryl); a represents the number of hydrocarbon groups, and b appearing later also represents the number of groups.

[0017] The organosilicon resin has a structure of R 3 0~3 R 4 0~2 (R 5 O) 0~3 SiO 0~2 wherein R 3 comprises one or more of an aminoalkyl group, a glycidyloxyalkyl group, or a mercaptoalkyl group; R 4 is one or both of an alkyl group and an aryl group; and R 5 is one or more of an alkyl group, H, an oxirane, and an oxetane, so as to increase the crosslinking density and water resistance of the resin.

[0018] The emulsifier is a non-ionic polyether-modified silicone emulsifier, so as to enhance the stability of the emulsion.

[0019] The water serves as a dispersion medium.

[0020] The aggregate filler comprises a compound system of one or both of nanoscale calcium carbonate and microscale potassium-sodium aluminum silicate, and sand or a combination thereof, so as to increase the compactness and anti-settling property.

[0021] The average particle size of the aggregate filler is about 1.5 μm to 1.0 mm.

[0022] The catalyst is an organotin-amine composite catalyst, so as to optimize the curing speed and storage stability.

[0023] The additive comprises hydrophobic fumed silica (0.1-2 wt.%) and a UV stabilizer (0.05-1 wt.%), so as to improve the weather resistance.

[0024] One of the end-group structures of the silane-terminated polymer is —O—C(═O)—NH—(CH2)—Si(OMe)3, which endows it with room temperature self-crosslinking ability and an elastic modulus ≤5MPa after curing (ASTM D638).

[0025] The silicone resin is a copolymer of MQ resin and T-type resin containing active groups, wherein the M / Q ratio is 0.1-0.5 and the T unit accounts for 30-60 mol%, so that it has an elongation at break of ≥200% while maintaining high strength.

[0026] In the premixed composition, the mass percentage of silane-terminated polymer is about 1-30 wt.%, the mass percentage of organosilicon resin is about 0-30 wt.%, the mass percentage of emulsifier is about 0.1-5 wt.%, the mass percentage of water is about 5-30 wt.%, the mass percentage of aggregate filler is about 50-90 wt.%, and the mass percentage of catalyst and / or additive is about 0-10 wt.%.

[0027] In the aggregate filler, the mass percentage of nano-calcium carbonate (20-80nm) is about 50-70 wt.%; the mass percentage of sodium potassium aluminum silicate (1-25μm) is about 20-40 wt.%; and the mass percentage of spherical silica powder is about 5-10 wt.%; so that the bulk density is ≥75% and the shrinkage rate is ≤0.1%.

[0028] The viscosity of the composition changes by ≤15% after 6 months of storage at 40℃ / 75%RH, and the extrusion force during application is ≤50N.

[0029] After curing, the water absorption rate is ≤1.5% (after 24 hours of soaking), and there is no cracking after 50 cycles from -20℃ to 80℃.

[0030] The method for composing the grouting material involves mixing a mixed emulsion with aggregate fillers to obtain a grouting material; mixing the grouting material with pigments and / or additives; and filling the premixed composition into a container and sealing it.

[0031] The mixed emulsion contains a polymer mixture of silane-terminated polymer and organosilicon resin emulsion.

[0032] The emulsion preparation includes the following steps: mixing a polymer mixture containing a silane-terminated polymer and an organosilicon resin emulsion with an emulsifier until homogeneous; adding water to the polymer mixture and mixing until homogeneous to obtain a paste; and diluting with water to obtain the desired paste concentration.

[0033] The premixed composition is suitable for gaps in substrates including but not limited to ceramic tiles, travertine tiles, porcelain tiles, slate, marble, and artificial wood.

[0034] The grouting material is directly applied to the substrate gap without on-site mixing; the surface drying time is 20-40 min (25℃), and the repairable time is ≥2 h; it is suitable for ceramic tile joints ≤5 mm, and can withstand washing after 24 h.

[0035] The present application provides a one-component elastic sealant based on silane-terminated polymer and silicone resin, which realizes rapid curing and forms a high-elasticity and high-adhesion-strength joint filling material by optimizing the ratio of emulsion system to aggregate.

[0036] The present application relates to a premixed composition, characterized by comprising two main components of silane-terminated polymer and silicone resin, and selectively adding emulsifier, water, aggregate filler, catalyst and additive. The components produce a synergistic effect through a specific mass ratio, forming a stable suspension system that not only effectively solves the defects of easy settlement and large shrinkage of traditional materials, but also breaks through the technical bottleneck of "high strength and brittleness" of traditional silane sealants. At the same time, it realizes rapid curing and maintains excellent color stability in long-term immersion or ultraviolet radiation environment. Technical features

[0037] One-component construction: no need for on-site mixing, direct extrusion or scraping, high construction efficiency.

[0038] Rapid curing: surface drying time ≤2 hours (25℃, 50%RH), and 24 hours to reach the use strength.

[0039] High elasticity: elongation at break ≥150%, suitable for thermal expansion and cold contraction of the substrate, avoiding cracking.

[0040] Excellent adhesion: adhesion strength to ceramic tile and stone ≥1.5 MPa, better than cement-based products.

[0041] Weather resistance: no powdering and falling off phenomenon after 1000 freeze-thaw cycle tests.

[0042] Environmental protection: no solvent and harmful monomer, in line with GB 18583-2008 standard. III. Preferred embodiments

[0043] Preferably, in the technical solution, the silane-terminated polymer is a silane-terminated polyoxypropylene with a specific end group structure (—O—C(=O)—NH—(CH2)—Si(OMe)3) with an end group termination rate ≥95%, which endows the composition with room temperature self-crosslinking ability, and the elastic modulus after curing is ≤5 MPa (ASTM D638) and the elongation at break is ≥300%.

[0044] Preferably, in the technical solution, the organic silicon resin adopts MQ-T type copolymer resin containing active amino / glycidyl group (M / Q=0.2-0.4, the proportion of T unit is 40-50 mol%), and the crosslinking density is regulated by the following: MQ resin: (Me3SiO 1 / 2 ) 0.4 (SiO 4 / 2 ) 0.6 , Mw=3,000-5,000 g / mol; T resin: contains (MeSiO 3 / 2 ) 0.7 (MeSi(OH)O 2 / 2 ) 0.1 (MeSi(OEt)O 2 / 2 ) 0.2 , and the hydrolysis condensation with the MQ resin makes the tensile strength after curing ≥1.5 MPa and the water absorption ≤1%.

[0045] Preferably, in the technical solution, the polyether modified silicone nonionic emulsifier (HLB value 12-14) is compounded (mass ratio 3:1) with nano-level partially hydrophobic silicon dioxide (particle size 10-30 nm) to form a three-dimensional network structure, so that the particle size increase of the emulsion is ≤10% after being stored at 40°C for 6 months.

[0046] Preferably, in the technical solution, the aggregate filler adopts modified calcium carbonate (50-70 wt.%, 20-80 nm, surface coated with stearic acid); sodium potassium aluminum silicate (20-40 wt.%, 1-25 μm, layered structure); spherical silica powder (5-10 wt., D 50 =0.05-0.1 mm), so that the bulk density reaches 78-82%, and the construction extrusion force is ≤45 N.

[0047] Preferably, in the technical solution, the catalyst system adopts a machine tin-amine composite catalyst (dioctyltin dilaurate, 0.5%-1.0%; 1,8-diazabicyclo[5.4.0]undec-7-ene, 0.1%-0.5%), which realizes the surface dry time of 25±5 min (25°C) in the pH range of 6-7, and the touch-up time is extended to 2.5 h.

[0048] Preferably, in the technical solution, the additive adds hydrophobic fumed silica (0.5-1.5 wt.%, BET 200±20 m 2 / g) and benzotriazole UV stabilizer (0.1-0.5 wt.%), and after QUV aging for 500 h, the color difference ΔE is ≤1.5, and there is no cracking after 100 times of thermal cycling at-20°C-80°C.

[0049] Preferably, in the technical features, by adjusting the water content (15-25wt.%) and the thixotropic agent (hydrophobic silica + modified cellulose ether) to be compounded, the composition is suitable for 1-5mm wide gap, and can be washed after 24h, and the anti-settling stability (50℃ / 7 days) is ≤0.5%.

[0050] Preferably, in the technical solution, the silane-terminated polymer is 15%-25%, the silicone resin is 5%-15%, the emulsifier is 1%-3%, the water is 10%-25%, the aggregate filler is 50%-80%, the catalyst is 0.5%-2%, and the additive is 0.5%-5%.

[0051] Preferably, in the technical features, the emulsion is prepared, the silane-terminated polymer, the silicone resin and the emulsifier are uniformly mixed, deionized water is slowly added, high-speed shearing emulsification (3000-5000 rpm, 10-20 min) is performed, a stable emulsion is formed, the fillers are mixed, the nano calcium carbonate, the sodium potassium aluminum silicate and the spherical silicon powder are premixed and dried (moisture ≤0.1%), and the emulsion is mixed at low speed (500-1000 rpm, 5-10 min) to avoid the introduction of air bubbles, and the mixed sealant is filled into a sealed tube or a plastic bottle to avoid contact with moisture.

[0052] The application also includes the sealant, the filler or the thick coating material obtained by the above method.

[0053] The application also includes the application of the sealant, the filler or the thick coating material in the technical field of building caulking.

[0054] The application has the following beneficial effects: The application provides a sealant, a filler or a thick coating material prepared by the synergistic effect of a silane-terminated polymer, a silicone resin and a catalyst system, which can be rapidly cured at room temperature, has high elasticity and strength, and is suitable for long-term filling of 1-5mm wide gaps.

[0055] The application can effectively improve the excellent weather resistance, environmental adaptability, construction convenience and storage stability of the traditional sealant material.

[0056] (3) The application has the characteristics of green preparation and wide applicability, has wide application prospect, and can be directly applied as a sealant, a filler or a thick coating material in the technical field of building caulking.

[0057] (4) The application realizes breakthroughs in curing speed, elasticity retention, weather resistance and construction friendliness, solves the contradiction between fast drying and brittleness and softness and difficulty in curing of the traditional sealant, and fills the technical gap of high-performance single-component sealant. BRIEF DESCRIPTION OF DRAWINGS

[0058] To further illustrate the present application, further description is made below in conjunction with the accompanying drawings: Figure 1 Formulation of high-elasticity indoor tile grout for Example 1; Figure 2 Table of performance test results for Example 1; Figure 3 Formulation of weather-resistant outdoor tile grout for Example 2; Figure 4 Fast-drying tile grout (suitable for low-temperature construction) for Example 3; Figure 5 Formulation of high-wear-resistance, weather-resistant outdoor tile grout for Example 4; Figure 6 Performance index.

[0059] Figure 7 Formulation example. DETAILED DESCRIPTION

[0060] The present application is further illustrated below in conjunction with the accompanying drawings and detailed description, which should be understood as merely illustrative of the present application and not limiting the scope of the present application.

[0061] The present application provides a premix composition comprising two main components, i.e., silane-terminated polymer and silicone resin, and optionally adding emulsifier, water, aggregate filler, catalyst and additive, and through the synergistic effect of the components in specific mass ratio, a stable suspension system is formed, rapid curing is achieved, and excellent color stability is maintained under long-term immersion or ultraviolet irradiation environment. The specific implementation scheme is as follows: (1) The premix composition of the present application comprises silane-terminated polymer, silicone resin emulsion, functional silane and auxiliary material system.

[0062] (2) The auxiliary material system in the premix composition comprises hydrophobic nano-silica 0.5-1.5 wt.%; light stabilizer: 0.1-0.5 wt.% (benzotriazole type); organotin catalyst 0.5-1.0 wt.%; amine synergistic catalyst 0.1-0.5 wt.%; (3) The silane-terminated polymer is a polyoxypropylene-based structure, and its end group comprises a -O-C(=O)-NH-(CH2)-Si(OR)3 functional group (wherein R is methyl or ethyl), and the number average molecular weight (Mn) is controlled within the range of 12,000-20,000 g / mol.

[0063] (4) The silane-terminated polymer is 70-90 wt% of propylene oxide monomer; 10-30 wt% of functional silane monomer.

[0064] (5) The mass ratio of each component in the premixed composition is: silane-terminated polymer 15-25 wt.%; silicone resin emulsion (solid content 40-50%) 5-15 wt.%; aggregate filler: 50-80 wt.%; water: 10-25 wt.%; catalyst and additives: 0.5-5 wt.%.

[0065] (6) The silicone resin emulsion comprises polymethyl ethoxysiloxane 30-60 wt%, octyl triethoxysilane 1-5 wt%, ethanol ≤3 wt%, and water in the balance.

[0066] (7) The aggregate filler system is stearic acid-coated calcium carbonate (20-80 nm, 50-70 wt%), sodium-potassium-aluminum silicate (1-25 μm, 20-40 wt%), and spherical silicon powder (0.05-0.1 mm, 5-10 wt%); (8) The preparation method of the premixed composition ① Emulsion preparation stage: stir the silane-terminated polymer and the silicone resin emulsion at 3000-5000 rpm for 10-20 min; slowly add deionized water and continue stirring for 15-25 min; control the pH value of the system in the range of 6.0-7.0.

[0067] ② Filler pretreatment stage: dry the aggregate at 120°C to a moisture content ≤0.1%; remove agglomerates through a 200-mesh sieve.

[0068] ③ Final product preparation: gradually add the filler to the emulsion system under stirring (500-1000 rpm); vacuum degassing treatment (10 min); fill into sealed packaging that isolates moisture (9) Performance indicators of the composition: ① Construction performance: extrusion force ≤50 N (standard glue gun), surface drying time (25°C) 20-40 min; repairable time ≥2 h ② Mechanical properties: tensile strength (7d) ≥1.5 MPa, elongation at break ≥200%, and elastic modulus ≤5 MPa ③ Durability: 24h water absorption rate ≤1.5%, -20°C-80°C thermal cycling 50 times, no cracking, QUV aging 500h color difference ΔE ≤1.5 (10) Application method of the composition: ① Substrate treatment: clean the joint (dust-free, oil-free), and keep the substrate dry (moisture content ≤8%).

[0069] ② Construction process: use a special glue gun to uniformly extrude along the joint at a 45° angle, use a plastic scraper to trim the surface, and use a wet sponge to clean the overflow (complete before surface drying).

[0070] ③ Maintenance requirements: avoid water flushing within 24 h, complete curing time 7 d (25℃) (11) Storage requirements of the composition: temperature 5-30℃, humidity ≤75% RH; shelf life 12 months (original packaging) Example 1: High-elasticity indoor ceramic tile caulk

[0071] Formulation Mass percentage Silane-terminated polymer end groups: -0-C(=0)-NH-(CH2)-Si(OMe)3, Mn = 15,000 g / mol 20% MQ-T silicone resin (M / Q = 0.3, T unit ratio 40%) 10% Polyether-modified silicone emulsifier (HLB = 13) 2% Deionized water 18% Nano calcium carbonate (50 nm, stearic acid coated) 35% Soda potassium alumino-silicate (10 μm) 10% Spherical silica powder (0.08 mm) 5% Dioctyltin dilaurate 0.8% DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) 0.2% Hydrophobic fumed silica (BET 200 m² / g) 1% Benzotriazole UV stabilizer 0.3% Preparation method:

[0072] Mix the silane-terminated polymer, silicone resin and emulsifier, stir at 3000 rpm for 10 min; slowly add deionized water, continue to stir for 15 min to form a stable emulsion; add the pre-mixed nano calcium carbonate, sodium potassium aluminosilicate and spherical silica powder to the emulsion, stir at low speed (800 rpm, 8 min); add the catalyst, fumed silica and UV stabilizer, mix uniformly and then fill.

[0073] Performance test: Tack-free time (25°C) 30 min Touch-up time 2.5 h Tensile strength (7-day cured) 1.8 MPa Elongation at break 280% Water absorption (24 h) 1.0% Storage stability (40°C / 6 months) Viscosity change +8% Example 2: Weather-resistant outdoor caulk

[0074] Formulation Mass percentage Silane-terminated polymer (end group: -0-C(=0)-NH-(CH2)3-Si(OEt)3, Mn = 18,000 g / mol) 18% MQ-T silicone resin (M / Q = 0.4, glycidyloxy-containing) 12% Polyether-modified silicone emulsifier (HLB = 12) 2.5% Deionized water 15% Nano calcium carbonate (30 nm) 40% Soda potassium alumino-silicate (5 μm) 8% Quartz sand (0.1 mm) 6% Organotin-amine complex catalyst (dioctyltin:DBU = 1:0.4) 1.2% Hydrophobic fumed silica 1.5% UV absorber + light stabilizer 0.5% Performance characteristics:

[0075] Color difference ΔE = 1.2 after QUV aging for 500 h, no powdering; No cracking after 100 times of thermal cycling between -30℃ and 80℃; Construction extrusion force ≤40 N (suitable for wide joints 5 mm) Example 3: Fast-drying caulk (suitable for low-temperature construction)

[0076] Formulation Mass percentage Silane-terminated polymer (end group: -0-C(=0)-NH-(CH2)-Si(OMe)3, Mn = 12,000 g / mol) 25% Highly active T-type resin (MeSiO 3 / 2 60% by weight)]] 8% Fast penetrating emulsifier (EO / PO block copolymer) 3% Deionized water 12% Nano calcium carbonate + silica powder (complex ratio 2:1) 45% Organotin-amine catalyst (double the amount) 2% Antifreeze agent (propylene glycol) 3% Curing performance:

[0077] Surface dry time at 5℃: 45 min (ordinary product >2 h); Touch-up time: 1.5 h (balance fast drying and operation requirements).

[0078] Example 4: High-wear-resistant, weather-resistant outdoor caulk Formulation Mass percentage Silane-terminated polymer (end group: -0-C(=0)-NH-(CH2)3-Si(OEt)3, Mn = 18,000 g / mol) 18% MQ-T silicone resin (M / Q = 0.4, glycidyloxy-containing) 12% Polyether-modified silicone emulsifier (HLB = 12) 2.5% Deionized water 15% Nano calcium carbonate (30 nm) + 10% alumina (3 μm) 40% Soda potassium alumino-silicate (5 μm) 8% Quartz sand (0.1 mm) 6% Organotin-amine complex catalyst (dioctyltin:DBU = 1:0.4) 1.2% Hydrophobic fumed silica 1.5% UV absorber + light stabilizer 0.5% Key performance:

[0079] Wear resistance (Taber test, CS-10 wheel, 1000 times): mass loss ≤0.05 g; Mohs hardness: ≥4, suitable for outdoor high-traffic areas.

[0080] Overall: the invention belongs to the technical field of building caulking material, and particularly relates to a single-component, high-elasticity, water-resistant silane modified ceramic tile joint sealant and a preparation method thereof. The invention mainly comprises the following components: a silane-terminated polymer as a main elastic component, a silicone resin as a crosslinking modifier, an organic tin-amine composite catalytic system as a curing accelerator, and a nano-scale compound aggregate as a reinforcing filler. Hydrophobic fumed silica, UV stabilizers and other functional additives are optionally added, and each component is emulsified and dispersed and the filler is compounded to form a paste system with excellent construction performance. The composition is characterized in that: through the synergistic crosslinking effect of the silane-terminated polymer and the silicone resin, the balance of high elasticity, rapid curing, water resistance and weather resistance of the joint sealant is achieved. The invention is particularly suitable for filling 1-5mm joints of indoor and outdoor ceramic tiles, stone and the like, the uncured paste has good extrudability and repairability, and after curing, an elastic filling body is formed which is firmly combined with the base material, has low water absorption, high elongation and excellent aging resistance. The invention has simple preparation process, is environmentally friendly, has good product storage stability, and is convenient for industrialized production and construction application.

[0081] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A single-component, high-elasticity, water-resistant silane-modified tile grout, characterized in that, The premixed composition comprises the following components: silane-terminated polymer, silicone resin, emulsifier, water, aggregate filler, catalyst, and additives.

2. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 1, characterized in that, The silane-terminated polymer has the formula Y[(CR 12 ) 1~10 SiR a (OR2) 1~3 ] 1~10 The structure, wherein Y is a polyurethane group or a polyoxyethylene polymer group, is formed by the interaction of N, O, S, C and CR. 1 2. Bonding; R, R 1 With R 2 It is a monovalent hydrocarbon group, which is H or optionally substituted, and a represents the number of hydrocarbon groups.

3. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 1, characterized in that, The organosilicon resin: has the formula R 3 0~3 R 4 0~2 (R 5 O) 0~3 SiO 0~2 Structure, where R 3 Contains one or more of aminoalkyl, glycidoxyalkyl, or mercaptoalkyl; R 4 It is one or both of alkyl and aryl groups; R 5 It is one or more of alkyl, H, ethylene oxide, and propylene oxide to improve the crosslinking density and water resistance of the resin.

4. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 2, characterized in that, The monovalent hydrocarbon group is any one of alkyl, alkenyl, alkynyl, or aryl.

5. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 1, characterized in that, The emulsifier is a nonionic polyether-modified siloxane emulsifier to enhance emulsion stability; the water serves as the dispersion medium; the aggregate filler comprises one or two of nano-sized calcium carbonate and micron-sized sodium potassium aluminum silicate, as well as sand or a combination thereof, to improve density and anti-settling properties; the average particle size of the aggregate filler is 1.5 μm to 1.0 mm; the single-component high-elasticity water-resistant silane-modified tile grout as described in claim 1, characterized in that the catalyst is an organotin-amine composite catalyst to optimize curing speed and storage stability; the additives include hydrophobic fumed silica (0.1-2 wt.%) and UV stabilizer (0.05-1 wt.%) to improve weather resistance.

6. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 1, characterized in that, The end-group structure of the silane-terminated polymer is —O—C(═O)—NH—(CH2)—Si(OMe)3, which endows it with room temperature self-crosslinking ability and an elastic modulus ≤5MPa after curing (ASTM D638).

7. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 1, characterized in that, The silicone resin is a copolymer of MQ resin containing active groups and T-type resin, wherein the M / Q ratio is 0.1-0.5 and the T unit accounts for 30-60 mol%, so that it has an elongation at break of ≥200% while maintaining high strength; in the premixed composition, the mass percentage of silane-terminated polymer is 1-30 wt.%, the mass percentage of silicone resin is 0-30 wt.%, the mass percentage of emulsifier is 0.1-5 wt.%, the mass percentage of water is 5-30 wt.%, the mass percentage of aggregate filler is 50-90 wt.%, and the mass percentage of catalyst and / or additive is 0-10 wt.%.

8. The single-component, high-elasticity, water-resistant silane-modified tile grout as described in claim 1, characterized in that, In the aggregate filler, nano-calcium carbonate (20-80nm) accounts for 50-70 wt.% by mass; sodium potassium aluminum silicate (1-25μm) accounts for 20-40 wt.% by mass; and spherical silica powder accounts for 5-10 wt.% by mass, so that the bulk density is ≥75% and the shrinkage rate is ≤0.1%.

9. The preparation method of the single-component high-elasticity water-resistant silane-modified tile grout as described in any one of claims 1-8, characterized in that, Method for grouting composition: Mixing emulsion contains a polymer mixture of silane-terminated polymer and organosilicon resin emulsion; It is then prepared as a grout or emulsion; The mixed emulsion is mixed with aggregate filler to obtain grout; the grout is mixed with pigments and / or additives; the premixed composition is placed into a container and sealed; The emulsion preparation includes the following steps: mixing a polymer mixture containing silane-terminated polymer and organosilicon resin emulsion with an emulsifier until homogeneous; adding water to the polymer mixture and mixing until homogeneous to obtain a paste; and diluting with water to obtain the desired paste concentration.

10. The method of using the single-component, high-elasticity, water-resistant silane-modified tile grout as described in any one of claims 1-8, characterized in that, Suitable for substrate gaps; The grout can be applied directly to the gaps in the substrate without on-site mixing; surface drying time is 20-40 minutes (25℃), and the finishing time is ≥2 hours. Suitable for tile joints ≤5mm, and can withstand washing after 24 hours; The viscosity of the composition changes by ≤15% after 6 months of storage at 40℃ / 75%RH, and the extrusion force during application is ≤50N; the water absorption rate after curing is ≤1.5% (after 24h soaking), and there is no cracking after 50 cycles from -20℃ to 80℃.

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