Long-acting mildew-proof sealant and preparation method thereof

Abstract

The application discloses a long-acting mildew-proof sealant and a preparation method thereof. The sealant comprises an A component and a B component. The A component is prepared from silane modified polyether, reinforcing filler, hydrophobic fumed silica, light stabilizer, antioxidant, coupling agent and epoxy curing agent. The B component is prepared from epoxy resin, hydrophobic fumed silica, reinforcing filler, water and catalyst. The coupling agent is a fluorine-containing coupling agent and an amino silane coupling agent with a weight ratio of 1.5-2.5:1. The sealant has good mildew-proof effect, long-acting mildew-proof, good elasticity, bending resistance, scratch resistance, small internal stress, and is not prone to cracking, tile damage caused by displacement, and other common problems of sealant. The sealant has strong adhesion to tiles and is not prone to falling off. The sealant is environment-friendly and beautiful, and has a good prospect in the sealant field.

Description

Technical Field

[0001] This invention belongs to the field of tile grout technology, and more specifically, this invention relates to a long-lasting anti-mildew two-component tile grout and its preparation method. Background Technology

[0002] Grout sealant is commonly used in kitchen and bathroom systems. Due to the humid environment, mold is prone to grow, therefore, the anti-mold properties of grout sealant are subject to high requirements. Traditional anti-mold grout sealants generally achieve their anti-mold effect by adding anti-mold agents. For example, patent CN116285822A prepared an anti-mold two-component epoxy grout sealant by adding antibacterial agents, toughening with nanofibers, and using modified carbon black as a reinforcing filler; patent CN117903739A disclosed a long-lasting environmentally friendly anti-mold silane-modified polyether sealant, which added anti-mold agents WJ400, BCO, or SYG20P, and has 3 times the anti-mold effect of Grade 0, with the Grade 0 anti-mold effect lasting up to 84 days; patent CN117304219A disclosed an anti-mold grout sealant that greatly improves the anti-mold effect of the grout sealant by adding a modified anti-mold agent obtained by reacting an alkali metal salt of 1,2-benzisothiazolin-3-one with trimethoxychlorosilane.

[0003] However, in actual use, over time, the anti-mold agent will migrate to the surface, and the anti-mold effect will decrease over time.

[0004] Furthermore, traditional grout sealants are generally based on a two-component epoxy system. These sealants typically have high strength and high hardness after curing, but due to the high cross-linking density of epoxy adhesive polymers, their elasticity is relatively poor, resulting in brittleness after curing and relatively poor resistance to yellowing. After applying grout sealant to tiles, due to prolonged thermal expansion and contraction, the grout sealant may easily crack, and the tiles themselves may also crack and break. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide a long-lasting anti-mildew grout and its preparation method. The anti-mildew performance of this grout can reach level 0 for 168 days, and it also has good elasticity and resistance to yellowing.

[0006] The specific technical solutions for achieving the above-mentioned objectives are as follows.

[0007] In a first aspect, the present invention provides a long-lasting anti-mildew grout sealant, comprising component A and component B, wherein component A is prepared from the following raw materials in parts by weight:

[0008]

[0009] Component B is prepared from the following raw materials in parts by weight:

[0010]

[0011] The coupling agent is a fluorinated coupling agent and an aminosilane coupling agent in a weight ratio of 1.5 to 2.5:1.

[0012] A second aspect of the present invention provides a method for preparing the above-mentioned long-lasting anti-mildew grout, comprising the following steps:

[0013] (1) Add silane-modified polyether, reinforcing filler, hydrophobic fumed silica, light stabilizer and antioxidant to a planetary machine, mix for 50 min to 70 min at 60℃~80℃ and vacuum degree of -0.06MPa~-0.08MPa, cool to below 50℃, add coupling agent and epoxy curing agent, mix for 20 min to 40 min to obtain component A;

[0014] (2) Add epoxy resin, hydrophobic fumed silica, reinforcing filler and water into a planetary machine, mix for 50 min to 70 min at 60℃~80℃ and vacuum degree of -0.06MPa~-0.08MPa, cool to below 50℃, add catalyst, mix for 20 min to 40 min to obtain component B.

[0015] This invention adds a certain weight ratio of compounded fluorinated coupling agent and aminosilane coupling agent to the base polymer, eliminating the need for additional anti-mold agents, thus enabling the grout to have an anti-mold effect. Moreover, the anti-mold effect does not decrease over time, achieving a level 0 anti-mold rating of 168 days. This solves the problem of the anti-mold effect of traditional anti-mold grout decreasing over time.

[0016] This invention uses silane-modified polyether compounded epoxy resin as the base polymer, and coordinates it with other components in a specific ratio to make the grout adhesive more elastic, resistant to bending and scratching, with less internal stress. It is less prone to cracking, a common problem with grout, and will not damage the tiles due to displacement. It has strong adhesion to the tiles, is not easy to fall off, has excellent resistance to yellowing, low VOC, is environmentally friendly and beautiful, and has good application prospects. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description will be provided below. 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 thorough and complete understanding of the disclosure of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0019] Unless otherwise specified, all examples are conducted under standard experimental conditions or as recommended in the manufacturer's instructions.

[0020] In some embodiments of the present invention, a long-lasting anti-mildew grout sealant is disclosed, comprising component A and component B, wherein component A is prepared from the following raw materials in parts by weight:

[0021]

[0022] Component B is prepared from the following raw materials:

[0023]

[0024] The coupling agent is a fluorinated coupling agent and an aminosilane coupling agent in a weight ratio of 1.5 to 2.5:1.

[0025] In some embodiments, a long-lasting anti-mildew grout sealant comprises component A and component B, wherein component A is prepared from raw materials comprising:

[0026]

[0027]

[0028] Component B is prepared from the following raw materials:

[0029]

[0030] In some embodiments, a long-lasting anti-mildew grout sealant comprises component A and component B, wherein component A is prepared from raw materials comprising:

[0031]

[0032] Component B is prepared from the following raw materials:

[0033]

[0034]

[0035] In some embodiments, the fluorinated coupling agent is one or more of 3,3,3-trifluoropropyltrimethoxysilane, 3,3,3-trifluoropropylmethyldimethoxysilane, trifluoropropyltriethoxysilane, tridecafluorooctyltrimethoxysilane, and tridecafluorooctyltriethoxysilane; and / or, the aminosilane coupling agent is one or more of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-aminoethyl-γ-aminopropyltrimethoxysilane, and N-aminoethyl-γ-aminopropyltriethoxysilane.

[0036] In some embodiments, the coupling agent is tridecylfluorooctyltrimethoxysilane and N-aminoethyl-γ-aminopropyltrimethoxysilane.

[0037] In some embodiments, the weight ratio of tridecafluorooctyltrimethoxysilane to N-aminoethyl-γ-aminopropyltrimethoxysilane is 1.5 to 2.0:1, more preferably 1.7 to 1.8:1.

[0038] In some embodiments, the silane-modified polyether is one or more of the following: SAX750, SAX400, SAX575, SAX530, SAX580, SAX590, MAX923, MAX602, MA480, MA490 from Kaneka Corporation, and XT 55, STP-E10, STP-E15, STP-E30, STP-E35, and XB502 from Wacker Chemie.

[0039] In some embodiments, the silane-modified polyether is STP-E10, MA490, and SAX750 in a weight ratio of 1 to 1.5:1:1.

[0040] In some embodiments, the reinforcing filler is one or more of nano-calcium carbonate, heavy calcium carbonate, silica powder, talc, and kaolin.

[0041] In some embodiments, the reinforcing filler is nano-calcium carbonate and silicon micropowder in a weight ratio of 4.5 to 5.5:1.

[0042] In some embodiments, the light stabilizer is one or more of BASF's Tinuvin UV-P, Tinuvin UV-9, Tinuvin 326, Tinuvin, Tinuvin 540, and Tinuvin 770.

[0043] In some embodiments, the light stabilizer is Tinuvin 326 and Tinuvin 770 in a weight ratio of 0.8 to 1.2:1.

[0044] In some embodiments, the antioxidant is one or more of BASF's IRGANOX 1135, IRGANOX 1010, and IRGANOX 245.

[0045] In some embodiments, the epoxy curing agent is one or more of aliphatic amines, cycloaliphatic amines, and polyether amines.

[0046] In some embodiments, the epoxy resin is bisphenol A epoxy resin.

[0047] In some embodiments, the catalyst is one or more of dibutyltin dilaurate, di(dodecylthio)dibutyltin, tetrabutyl-1,3-bis(distannoxane), dioctyltin diacetate, chelated tin, stannous octoate, or organotin bis(β-diketone).

[0048] In other embodiments of the present invention, a method for preparing the above-mentioned long-lasting anti-mildew grout is disclosed, which includes the following steps:

[0049] (1) Add silane-modified polyether, reinforcing filler, hydrophobic fumed silica, light stabilizer and antioxidant to a planetary machine, mix for 50 min to 70 min at 60℃~80℃ and vacuum degree of -0.06MPa~-0.08MPa, cool to below 50℃, add coupling agent and epoxy curing agent, mix for 20 min to 40 min to obtain component A;

[0050] (2) Add epoxy resin, hydrophobic fumed silica, reinforcing filler and water into a planetary machine, mix for 50 min to 70 min at 60℃~80℃ and vacuum degree of -0.06MPa~-0.08MPa, cool to below 50℃, add catalyst, mix for 20 min to 40 min to obtain component B.

[0051] All parts of raw materials mentioned in the following examples are by weight.

[0052] The present invention will be described in detail below with reference to specific embodiments.

[0053] Example 1

[0054] This embodiment provides a long-lasting, mildew-resistant two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0055] Take 100 parts of MAX923, 4 parts of hydrophobic fumed silica, 15 parts of nano-calcium carbonate, 15 parts of heavy calcium carbonate, 2 parts of Tinuvin 326, 2 parts of Tinuvin 770, and 2 parts of IRGANOX 245, add them to a planetary mixer, mix at high speed for 60 min at 70℃ and a vacuum of -0.07 MPa, and after cooling to below 50℃, add 3 parts of a complex coupling agent of 3,3,3-trifluoropropyltrimethoxysilane and 1.5 parts of N-aminoethyl-γ-aminopropyltrimethoxysilane (premixed) and 10 parts of D220, mix for 30 min to obtain component A.

[0056] The preparation method for component B is as follows:

[0057] Take 100 parts of bisphenol A epoxy resin, 6 parts of hydrophobic fumed silica, 10 parts of nano calcium carbonate, 10 parts of silica powder, and 1 part of water and add them to a planetary mixer. Mix at high speed for 30 minutes at a temperature of 60℃ and a vacuum of -0.07MPa. After cooling to below 50℃, add 5 parts of di(dodecylthio)dibutyltin and stir for 20 minutes to obtain component B.

[0058] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0059] Example 2

[0060] This embodiment provides a long-lasting, mildew-resistant two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0061] Take 70 parts of SAX400, 30 parts of MA490, 5 parts of hydrophobic fumed silica, 10 parts of nano-calcium carbonate, 20 parts of heavy calcium carbonate, 2 parts of Tinuvin 326, 2 parts of Tinuvin 770, and 3 parts of IRGANOX 245, add them to a planetary mixer, mix at high speed for 60 min at 70℃ and a vacuum of -0.08 MPa, and after cooling to below 50℃, add 3 parts of a complex coupling agent of 3,3,3-trifluoropropyltrimethoxysilane and 2 parts of N-aminoethyl-γ-aminopropyltrimethoxysilane (premixed) and 12 parts of IPDA, mix for 30 min to obtain component A.

[0062] The preparation method for component B is as follows:

[0063] Take 100 parts of bisphenol A resin, 5 parts of hydrophobic fumed silica, 5 parts of nano calcium carbonate, 20 parts of heavy calcium carbonate, and 0.5 parts of water and add them to a planetary mixer. Mix at high speed for 30 minutes at a temperature of 60℃ and a vacuum of -0.07MPa. After cooling to below 50℃, add 6 parts of dibutyltin dilaurate and stir for 20 minutes to obtain component B.

[0064] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0065] Example 3

[0066] This embodiment provides a long-lasting, mildew-resistant two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0067] Take 70 parts of STP-E15, 30 parts of XB502, 3 parts of hydrophobic fumed silica, 25 parts of nano-calcium carbonate, 5 parts of Tinuvin UV-P, and 3 parts of IRGANOX 1010, add them to a planetary mixer, mix at high speed for 60 min at 65℃ and a vacuum of -0.08 MPa, and after cooling to below 50℃, add 4.5 parts of a complex coupling agent of 3,3,3-trifluoropropyltrimethoxysilane and 2.5 parts of N-aminoethyl-γ-aminopropyltriethoxysilane (premixed) and 5 parts of D230, and mix for 30 min to obtain component A.

[0068] The preparation method for component B is as follows:

[0069] Take 100 parts of bisphenol A resin, 4 parts of hydrophobic fumed silica, 10 parts of nano calcium carbonate, 20 parts of talc powder, and 0.5 parts of water and add them to a planetary mixer. Mix at high speed for 30 minutes at a temperature of 60℃ and a vacuum of -0.08MPa. After cooling to below 50℃, add 2 parts of dibutyltin dilaurate and stir for 20 minutes to obtain component B.

[0070] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0071] Example 4

[0072] This embodiment provides a long-lasting, mildew-resistant two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0073] Take 50 parts of MA480, 50 parts of STP-E35, 4 parts of hydrophobic fumed silica, 20 parts of nano-calcium carbonate, 5 parts of heavy calcium carbonate, 3 parts of Tinuvin 326, and 1.5 parts of IRGANOX 1010, add them to a planetary mixer, and mix at high speed for 60 min at 70℃ and a vacuum of -0.08 MPa. After cooling to below 50℃, add 4.5 parts of a complex coupling agent of trifluoropropyltriethoxysilane and 3 parts of γ-aminopropyltrimethoxysilane (premixed) and 10 parts of 1,3-BAC, and mix for 30 min to obtain component A.

[0074] The preparation method for component B is as follows:

[0075] Take 100 parts of bisphenol A resin, 5 parts of hydrophobic fumed silica, 5 parts of nano calcium carbonate, 20 parts of heavy calcium carbonate, and 0.5 parts of water and add them to a planetary mixer. Mix at high speed for 30 minutes at a temperature of 60℃ and a vacuum of -0.07MPa. After cooling to below 50℃, add 6 parts of dibutyltin dilaurate and stir for 20 minutes to obtain component B.

[0076] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0077] Example 5

[0078] This embodiment provides a long-lasting, mildew-resistant two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0079] Take 40 parts of STP-E10, 30 parts of MA490, 30 parts of SAX750, 2 parts of hydrophobic fumed silica, 25 parts of nano-calcium carbonate, 5 parts of silica powder, 2.5 parts of Tinuvin 326, 2.5 parts of Tinuvin 770, and 5 parts of IRGANOX 1010, add them to a planetary mixer, mix at high speed for 60 min at 60℃ and a vacuum of -0.08 MPa, and after cooling to below 50℃, add 3.5 parts of a complex coupling agent of tridecafluorooctyltrimethoxysilane and 2 parts of N-aminoethyl-γ-aminopropyltrimethoxysilane (premixed) and 15 parts of D230, mix for 30 min to obtain component A.

[0080] The preparation method for component B is as follows:

[0081] Take 100 parts of bisphenol A resin, 4 parts of hydrophobic fumed silica, 30 parts of heavy calcium carbonate, and 1 part of water and add them to a planetary mixer. Mix at high speed for 30 minutes at a temperature of 60℃ and a vacuum of -0.07MPa. Cool to below 50℃, add 5 parts of tetrabutyl-1,3-bis(distannoxane), and stir for 20 minutes to obtain component B.

[0082] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0083] Comparative Example 1

[0084] This comparative example provides a two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0085] Take 40 parts of STP-E10, 30 parts of MA490, 30 parts of SAX750, 2 parts of hydrophobic fumed silica, 25 parts of nano-calcium carbonate, 5 parts of silica powder, 2.5 parts of Tinuvin 326, 2.5 parts of Tinuvin 770, and 5 parts of IRGANOX 1010, add them to a planetary mixer, mix at high speed for 60 min at 60℃ and a vacuum of -0.08 MPa, and after cooling to below 50℃, add 5.5 parts of N-aminoethyl-γ-aminopropyltrimethoxysilane and 15 parts of D230, mix for 30 min, and obtain component A.

[0086] The preparation method for component B is as follows:

[0087] Take 100 parts of bisphenol A resin, 4 parts of hydrophobic fumed silica, 30 parts of heavy calcium carbonate, and 1 part of water and add them to a planetary mixer. Mix at high speed for 30 minutes at a temperature of 60℃ and a vacuum of -0.07MPa. After cooling to below 50℃, add 5 parts of tetrabutyl-1,3-bis(distannoxane) and stir for 20 minutes to obtain component B.

[0088] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0089] Comparative Example 2

[0090] This comparative example provides a two-component tile grout, consisting of component A and component B. Component A is prepared as follows:

[0091] Take 100 parts of bisphenol A resin, 10 parts of hydrophobic fumed silica, 6 parts of Tinuvin 770, 1 part of AGE (epoxy reactive diluent), and 0.5 parts of defoamer, add them to a planetary mixer, mix at high speed for 100 min at 60℃ and a vacuum of -0.07 MPa, and cool to room temperature to obtain component A.

[0092] The preparation method for component B is as follows:

[0093] Take 90 parts of D230, 6 parts of Tinuvin 326, 1 part of AGE, and 8 parts of fumed silica and add them to a planetary mixer. Stir at high speed under vacuum with a vacuum degree of -0.09 MPa for 60 min and cool to room temperature to obtain component B.

[0094] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0095] Comparative Example 3

[0096] This comparative example provides a two-component tile grout, consisting of component A and component B, wherein component A is prepared in the same way as in Example 5.

[0097] The preparation method for component B is as follows:

[0098] Take 100 parts of STP-E35, 4 parts of hydrophobic fumed silica, and 30 parts of heavy calcium carbonate and add them to a planetary mixer. Mix at high speed for 30 minutes at 60°C and a vacuum of -0.07 MPa. Cool to below 50°C and add 5 parts of tetrabutyl-1,3-bis(distannous)oxane. Stir for 20 minutes to obtain component B.

[0099] When using, mix component A and component B evenly at a volume ratio of 1:1.

[0100] Comparative Example 4

[0101] This comparative example provides a two-component tile grout, consisting of component A and component B. The complex coupling agent in component A is 3 parts tridecafluorooctyltrimethoxysilane and 3 parts N-aminoethyl-γ-aminopropyltrimethoxysilane. Other raw materials and preparation methods are the same as in Example 5.

[0102] Comparative Example 5

[0103] This comparative example provides a two-component tile grout, consisting of component A and component B. The complex coupling agent in component A is 5 parts tridecafluorooctyltrimethoxysilane and 1 part N-aminoethyl-γ-aminopropyltrimethoxysilane. Other raw materials and preparation methods are the same as in Example 5.

[0104] The two-component grout prepared in Examples 1-5 and Comparative Examples 1-5 were subjected to the following performance tests, and the test methods are as follows:

[0105] 1. Surface drying time: determined in accordance with GB / T 13477.5.

[0106] 2. Sagging: Measured in accordance with GB / T 13477.6.

[0107] 3. Flexibility: The test shall be conducted in accordance with 6.4.5 of T / CBMF 166-2022.

[0108] 4. Tensile strength: The test in GB / T 528-2009 uses type 1 dumbbell-shaped specimens.

[0109] 5. Elongation at break: The test in GB / T 528-2009 uses a type 1 dumbbell-shaped specimen.

[0110] 6. Hardness: Tested according to GB / T 2411 using a Type D Shore hardness tester.

[0111] 7. Abrasion resistance: Tested according to 6.4.7 of T / CBMF 166-2022.

[0112] 8. Resistance to liquid media: Test according to 6.4.8 of T / CBMF 166-2022.

[0113] 9. Stain resistance: Tested according to 6.4.9 of T / CBMF 166-2022.

[0114] 10. Artificial climate aging: The test shall be conducted in accordance with 6.4.10 of T / CBMF 166-2022.

[0115] 11. Bonding strength with ceramic tiles: Tested according to 6.4.11 of T / CBMF 166-2022.

[0116] 12. Anti-mildew properties: Tested according to GB / T 1741-2020.

[0117] 13. VOC: Tested in accordance with GB 18583.

[0118] Table 1

[0119]

[0120]

[0121] As shown in Table 1, the two-component grout prepared by using a polyether and epoxy dual-curing system and adding a coupling agent composed of fluorinated coupling agent and aminosilane coupling agent can provide long-lasting mildew prevention, achieving a level 0 mildew prevention of 168 days (Examples 1-5). Furthermore, due to the combination of the characteristics of silane-modified polyether and epoxy adhesive, it has good elasticity, is resistant to bending and scratching, has low internal stress, and is less prone to cracking problems common in grout. It will not cause damage to tiles due to displacement or other reasons, has high tile bonding strength, is not easy to fall off, and has excellent resistance to yellowing.

[0122] In terms of anti-mold properties, Comparative Example 1 and Example 5 use different coupling agents. Comparative Example 1 only used an ammonia-based coupling agent, while Example 5 used a coupling agent that is a combination of a fluorine-containing coupling agent and an ammonia-based coupling agent. The anti-mold properties of Comparative Example 1 can only reach level 1, while the anti-mold properties of Example 5 can reach level 0 anti-mold for 168 days.

[0123] Comparative Example 2 is a typical formulation of traditional two-component epoxy grout, with a mildew resistance level of only 1. Compared with the grouts in Examples 1-5, the grout using a polyether and epoxy dual-curing system shows a significant improvement in elongation at break and a marked improvement in the elasticity of the grout strip. In the flexibility test, no cracks were found in Examples 1-5, while shallow cracks appeared in Comparative Example 2. Moreover, in terms of VOC results, the VOC of Examples 1-5 is much lower than that of Comparative Example 2. At the same time, in the artificial climate aging test, it was found that Comparative Example 2 is prone to discoloration and is rated as 1, while Examples 1-5 are all rated as 0.

[0124] Comparative Example 3 is a two-component polyether-based grout. Compared with the grouts in Examples 1-5, its tensile strength is significantly lower than that of the polyether and epoxy dual-curing system grout. In the adhesion strength test with tiles, the adhesion strength is also significantly lower than that of the polyether and epoxy dual-curing system grout.

[0125] Comparative Example 4 is a grout sealant with a polyether and epoxy dual-curing system. In the composite coupling agent of component A, the weight ratio of fluorinated coupling agent to ammonia coupling agent is 1:1. The fluorinated coupling agent accounts for a relatively small amount of mass. In the anti-mildew test, it can only achieve a level 0 anti-mildew rating for 28 days and cannot achieve long-term anti-mildew effect.

[0126] Comparative Example 4 is a grout sealant with a polyether and epoxy dual-curing system. The weight ratio of fluorinated coupling agent to ammonia coupling agent in the composite coupling agent is 5:1. The ammonia coupling agent has a relatively small mass, which affects the adhesion and results in a bonding strength with the tile that is much lower than that in Examples 1 to 5.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A long-lasting anti-mildew grout sealant, characterized in that, It comprises component A and component B, wherein component A is prepared from the following raw materials in parts by weight: 100 parts of silane-modified polyether 20 to 40 parts of reinforcing filler 1 to 5 parts of hydrophobic fumed silica Light stabilizer 0.5 to 5 parts Antioxidant 0.5 to 5 parts 3 to 8 parts coupling agent 5 to 20 parts of epoxy curing agent Component B is prepared from the following raw materials in parts by weight: 100 parts epoxy resin 2 to 10 parts of hydrophobic fumed silica 20 to 40 parts of reinforcing filler 0.5 to 1 part water Catalyst: 0.5 to 10 parts; The coupling agent is tridecafluorooctyltrimethoxysilane and N-aminoethyl-γ-aminopropyltrimethoxysilane in a weight ratio of 1.5~2.5:

1.

2. The long-lasting anti-mildew grout sealant according to claim 1, characterized in that, Component A is prepared from the following raw materials in parts by weight: 100 parts of silane-modified polyether 20-30 parts of reinforcing filler 2 to 5 parts of hydrophobic fumed silica 3 to 5 parts light stabilizer Antioxidant 1.5 to 5 parts 3 to 7.5 parts coupling agent 5 to 15 parts epoxy curing agent Component B is prepared from the following raw materials in parts by weight: 100 parts epoxy resin 4 to 6 parts of hydrophobic fumed silica 20-30 parts of reinforcing filler 0.5 to 1 part water Catalyst 2 to 6 parts.

3. The long-lasting anti-mildew grout sealant according to claim 2, characterized in that, Component A is prepared from the following raw materials in parts by weight: 100 parts of silane-modified polyether 25-30 parts of reinforcing filler 2 to 3 parts of hydrophobic fumed silica 4 to 5 parts light stabilizer 3 to 5 parts antioxidants Coupling agent 5.5 parts to 7.5 parts 10 to 15 parts epoxy curing agent Component B is prepared from the following raw materials in parts by weight: 100 parts epoxy resin 4 to 6 parts of hydrophobic fumed silica 25-30 parts of reinforcing filler 0.5 to 1 part water Catalyst: 4 to 6 parts.

4. The long-lasting anti-mildew grout sealant according to any one of claims 1 to 3, characterized in that, The weight ratio of component A to component B is 0.8~1.2:

1.

5. The long-lasting anti-mildew grout sealant according to claim 1, characterized in that, The weight ratio of the tridecafluorooctyltrimethoxysilane to N-aminoethyl-γ-aminopropyltrimethoxysilane is 1.5~2.0:

1.

6. The long-lasting anti-mildew grout sealant according to claim 5, characterized in that, The weight ratio of the tridecafluorooctyltrimethoxysilane to N-aminoethyl-γ-aminopropyltrimethoxysilane is 1.7~1.8:

1.

7. The long-lasting anti-mildew grout sealant according to any one of claims 1 to 3, characterized in that, The silane-modified polyether is one or more of the following: SAX750, SAX400, SAX575, SAX530, SAX580, SAX590, MAX923, MAX602, MA480, MA490 from Kaneka Corporation, and XT 55, STP-E10, STP-E15, STP-E30, STP-E35, and XB502 from Wacker Chemie. And / or, the reinforcing filler is one or more of nano-calcium carbonate, heavy calcium carbonate, silica powder, talc powder, and kaolin. And / or, the light stabilizer is one or more of BASF's Tinuvin UV-P, Tinuvin UV-9, Tinuvin 326, Tinuvin 540, and Tinuvin 770; And / or, the antioxidant is one or more of BASF's IRGANOX 1135, IRGANOX 1010, and IRGANOX 245; And / or, the epoxy curing agent is one or more of aliphatic amines, cycloaliphatic amines, and polyether amines; And / or, the epoxy resin is bisphenol A epoxy resin; And / or, the catalyst is one or more of dibutyltin dilaurate, di(dodecylthio)dibutyltin, tetrabutyl-1,3-bis(distannoxane), dioctyltin diacetate, stannous octoate, or organotin bis(β-diketone).

8. The long-lasting anti-mildew grout sealant according to claim 7, characterized in that, The silane-modified polyether is STP-E10, MA490, and SAX750 in a weight ratio of 1~1.5:1:1; the reinforcing filler is nano-calcium carbonate and silica powder in a weight ratio of 4.5~5.5:1; and the light stabilizer is Tinuvin 326 and Tinuvin 770 in a weight ratio of 0.8~1.2:

1.

9. The method for preparing the long-lasting anti-mildew grout sealant according to any one of claims 1 to 8, characterized in that, Includes the following steps: (1) Add silane-modified polyether, reinforcing filler, hydrophobic fumed silica, light stabilizer and antioxidant to planetary machine, mix for 50 min to 70 min at 60℃ to 80℃ and vacuum degree of -0.06MPa to -0.08 MPa, cool to below 50℃, add coupling agent and epoxy curing agent, mix for 20 min to 40 min to obtain component A; (2) Add epoxy resin, hydrophobic fumed silica, reinforcing filler and water into a planetary machine, mix for 50 min to 70 min at 60℃ to 80℃ and vacuum degree of -0.06 MPa to -0.08 MPa, cool to below 50℃, add catalyst, mix for 20 min to 40 min to obtain component B.

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