High-flexibility epoxy sealant and preparation method thereof

Abstract

The invention relates to the technical field of epoxy hybrid new materials, and discloses a high-flexibility epoxy sealant and a preparation method thereof.The sealant is composed of a component A and a component B. The component A is prepared from, by volume, 60-100 parts of silane modified polyether polymer, 0-20 parts of amine curing agent, 0-10 parts of thixotropic agent, 0-5 parts of ultraviolet absorbent, 0-5 parts of dewatering agent and 0-2 parts of catalyst; the component B comprises 60-100 parts of epoxy resin, 0-10 parts of thixotropic agent, 0-30 parts of toner, 0-20 parts of filler and 0-5 parts of diluent. Compared with a common sealant, the MS epoxy hybrid sealant has better bonding universality and excellent ultraviolet resistance and weather resistance, the bonding area is wider due to strong polar groups in molecules, the MS epoxy hybrid sealant can be normally cured in a humid environment, the construction environment is not limited, and the MS epoxy hybrid sealant has practical and practical significance to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy hybrid new materials, and in particular to a high-flexibility epoxy seam beautifying agent and a preparation method thereof. Background Art

[0002] Sealing agents are gradually gaining favor among consumers in the field of indoor tile gap beautification due to their simple construction operation, hardness like porcelain after curing, and stain resistance and waterproofness. However, most of the seaming agents currently circulating on the market are made of fatty amines and alicyclic amines modified by epoxy resin. Although these materials have the characteristics of high hardness, they also have the problem of high brittleness. In practical applications, this brittleness leads to a series of problems.

[0003] First of all, most real estate or home improvement households usually perform seam beautification after tiling, and then install furniture such as cabinets and wall mirrors after the tiles are cured. However, during the installation process, due to the high-speed vibration of power tools, the tiles may move, resulting in varying degrees of cracking of the caulking agent. This cracking not only affects the appearance, but also increases the workload of secondary caulking, which requires cleaning the residual glue and re-applying glue, which is time-consuming and laborious.

[0004] Secondly, the application of caulking agent has high requirements on environmental conditions. Before caulking, it is necessary to ensure that the gaps between tiles are clean, dust-free, dry and free of moisture. Especially in the low temperature in the north or the humid conditions in the south, if these conditions are not met, the caulking agent will bulge, incompletely cure or debond. This greatly limits the scope of application of caulking agent, making it impossible to apply normally in certain specific environments.

[0005] In addition, the existing seam sealants on the market are also insufficient in terms of anti-yellowing effect. Although there are many types of seam sealants on the market, including hydrogenated, carbocyclic, polyurea, etc., these products are generally not resistant to yellowing due to the characteristics of the epoxy curing agent itself. Over time, the color of the seam sealant will gradually turn yellow, affecting the overall appearance.

[0006] Therefore, it is of practical and realistic significance to develop a high-toughness, crack-resistant, weather-resistant caulking agent that can be used in humid environments. Summary of the invention

[0007] The present invention aims to provide a high-flexibility epoxy caulking agent and a preparation method thereof, so as to solve the defects of the caulking agent in the prior art, such as cracking to varying degrees caused by installing cabinets and wall mirrors after tiling tiles, inability to construct in a humid environment, and poor yellowing resistance.

[0008] To achieve the above object, the present invention adopts the following technical scheme: a high-flexibility epoxy seam beautifying agent, composed of component A and component B, in parts by volume, component A includes 60-100 parts of silane-modified polyether polymer, 0-20 parts of amine curing agent, 0-10 parts of thixotropic agent, 0-5 parts of ultraviolet absorber, 0-5 parts of dewatering agent, and 0-2 parts of catalyst; component B includes 60-100 parts of epoxy resin, 0-10 parts of thixotropic agent, 0-30 parts of color powder, 0-20 parts of filler, and 0-5 parts of diluent.

[0009] Preferably, as an improvement, the volume ratio of component A to component B is 1:1.

[0010] Preferably, as an improvement, the silane-modified polyether polymer is at least one of SAX-750, FS-S8, and RISUN-350A.

[0011] Preferably, as an improvement, the amine curing agent is at least one of polyamide 650 and alicyclic amine IPDA.

[0012] Preferably, as an improvement, the thixotropic agent is at least one of nano-calcium carbonate, fumed silica, polyamide wax, and organic bentonite, and the specific surface area of ​​the fumed silica is 150 m2 / g.

[0013] Preferably, as an improvement, the ultraviolet absorber is at least one of UV7210, JC-1403, and antioxidant 1010; and the dehydrating agent is at least one of molecular sieve, soda lime, and vinyltrimethoxysilane.

[0014] Preferably, as an improvement, the catalyst is at least one of organic tin and chelated tin.

[0015] Preferably, as an improvement, the epoxy resin is E54 or E51; the color powder is at least one of titanium dioxide, pearlescent pigment, and PET powder; and the filler is at least one of calcium sulfate, nano-activated calcium carbonate, bentonite, and transparent powder.

[0016] Preferably, as an improvement, the diluent is at least one of polyethylene glycol diglycidyl ether, benzyl alcohol, propylene carbonate, and deionized water.

[0017] Preferably, as an improvement, a method for preparing a high-flexibility epoxy seam sealant comprises the following steps:

[0018] Step 1, preparation of component A: mixing and degassing the silane-modified polyether polymer, the amine curing agent, the thixotropic agent, the ultraviolet absorber, the dehydrating agent and the catalyst under vacuum conditions to obtain component A;

[0019] Step 2, preparation of component B: mixing epoxy resin, color powder, thixotropic agent, filler and diluent uniformly and degassing under vacuum conditions to obtain component B;

[0020] Step 3: Mixing: When using, mix component A and component B in a volume ratio of 1:1 to obtain an AB mixture.

[0021] The principle and advantage of this solution are: in actual application, this technical solution aims at the defects of different degrees of cracking caused by installing cabinets and wall mirrors after tiling tiles in the existing caulking agent, the inability to be constructed in a humid environment, and poor yellowing resistance. The inventor has comprehensively optimized the formula and preparation process of the caulking agent. In terms of the formula composition: by introducing silane-modified polyether polymers, since the silicon-oxygen-silicon bond energy is much larger than the ordinary carbon-oxygen-carbon bond energy, the molecules can rotate freely. This unique molecular structure gives the MS epoxy hybrid caulking agent high tear resistance and weather resistance. In the technical research and development stage, the selection of silane-modified polymers is one of the difficulties of this technical solution. Silane-modified polyether polymers have high toughness, elongation, and aging resistance, but low strength; and in the process of reinforcing and neutralizing its performance, the inventor introduced epoxy resins and amine curing agents. Although the polymers cured by epoxy resins and amines have high strength, they are brittle, and have poor toughness, yellowing resistance, and aging resistance. This technical solution creatively mixes epoxy resin into modified polyether polymer. Through hybridization, the rigid structure in the epoxy resin gives the MS epoxy hybrid caulking agent high mechanical strength and hardness during the cross-linking process, and the silane-modified polyether polymer gives it high tensile strength and flexibility. The two complement each other synergistically, thereby greatly extending the service life of the caulking agent after filling the seams. In the prior art, although there are also studies on toughening and modifying caulking agents, most of them choose modified polyether amines, whose curing principles and chemical compositions are essentially different from those of this technical solution, and there are few that take into account aging resistance, weather resistance and mechanical properties. In addition, the selection of catalysts is also one of the difficulties of this technical solution. Different activities and different catalysts will have a significant impact on the storage of component A after glue making. Improper selection will lead to thickening or self-curing, thereby affecting the performance of the caulking agent.

[0022] In summary, the beneficial effect of this technical solution is that ordinary caulking agents are limited to beautifying the caulking between tiles. In places like balconies or places with direct sunlight, and where plastic or wooden floors are spliced ​​with tiles, it will cause cracking or bonding failure. In this technical solution, the MS epoxy hybrid caulking agent, through the optimization of raw materials, has more universal bonding than ordinary caulking agents, and has excellent UV resistance and weather resistance. The strong polar groups in the molecules make the bonding area wider, and it can be cured normally in a humid environment. The construction environment is not restricted. Compared with ordinary caulking agents, the construction method is more flexible and to some extent more practical and realistic. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementations, but the implementation of the present invention is not limited thereto. Unless otherwise specified, the technical means used in the following implementations are conventional means well known to those skilled in the art; the experimental methods used are all conventional methods; the materials, reagents, etc. used can all be obtained from commercial channels.

[0024] Program Overview:

[0025] A high-flexibility epoxy seam beautifying agent is composed of component A and component B. Component A comprises 60-100 parts of silane-modified polyether polymer, 0-20 parts of amine curing agent, 0-10 parts of thixotropic agent, 0-5 parts of ultraviolet absorber, 0-5 parts of dewatering agent and 0-2 parts of catalyst in parts by volume; component B comprises 60-100 parts of epoxy resin, 0-10 parts of thixotropic agent, 0-30 parts of color powder, 0-20 parts of filler and 0-5 parts of diluent.

[0026] The silane-modified polyether polymer is at least one of the domestic MS resins SAX-750, FS-S8 and RISUN-350A.

[0027] The amine curing agent is at least one of polyamide 650 and alicyclic amine IPDA.

[0028] The thixotropic agent is at least one of nano calcium carbonate, fumed silica, polyamide wax, and organic bentonite; preferably, the thixotropic agent is fumed silica with a high thixotropic index, rheological and anti-settling properties, and a specific surface area of ​​150 m2 / g.

[0029] The ultraviolet absorber is at least one of UV7210, JC-1403 and antioxidant 1010.

[0030] The dehydrating agent is at least one of molecular sieve, soda lime and vinyl trimethoxy silane; preferably, the dehydrating agent is vinyl trimethoxy silane which has good heat resistance, high mechanical strength and stress cracking resistance.

[0031] The catalyst is at least one of organic tin and chelated tin.

[0032] The epoxy resin is commercially available general-purpose epoxy resin E54 or E51.

[0033] The color powder is at least one of titanium dioxide, pearlescent pigment and PET powder; preferably, the diluent is deionized water which can be cross-linked and cured with the silane-modified polyether polymer and is a readily available raw material.

[0034] The filler is at least one of calcium sulfate, nano-active calcium carbonate, bentonite and transparent powder.

[0035] The diluent is at least one of polyethylene glycol diglycidyl ether, benzyl alcohol, propylene carbonate and deionized water.

[0036] A method for preparing a high-flexibility epoxy seam-beautifying agent comprises the following steps:

[0037] Step 1, preparation of component A: mixing and degassing the silane-modified polyether polymer, the amine curing agent, the thixotropic agent, the ultraviolet absorber, the dehydrating agent and the catalyst under vacuum conditions to obtain component A;

[0038] Step 2, preparation of component B: mixing epoxy resin, color powder, thixotropic agent, filler and diluent uniformly and degassing under vacuum conditions to obtain component B;

[0039] Step 3: Mixing: When using, mix component A and component B in a volume ratio of 1:1 to obtain an AB mixture;

[0040] Step 4: Curing: Curing at room temperature under natural conditions.

[0041] Example 1

[0042] A method for preparing a high-flexibility epoxy seam-beautifying agent comprises the following steps:

[0043] Step 1, preparation of component A: 60 parts of silane-modified polyether polymer, 5 parts of thixotropic agent, 10 parts of amine curing agent, 2 parts of ultraviolet absorber, 1 part of dewatering agent, and 0.5 parts of catalyst are mixed and degassed uniformly under vacuum conditions to obtain component A;

[0044] Step 2, preparation of component B: 60 parts of epoxy resin, 4 parts of thixotropic agent, 5 parts of color powder, 10 parts of filler and 2 parts of diluent are mixed and degassed uniformly under vacuum conditions to obtain component B;

[0045] Among them, the silane-modified polyether polymer is MS resin SAX-750, which has high activity, medium modulus, viscosity of 20000-30000mpa.s, tensile strength of 1.2MPa, and elongation at break of 300%; the filler is bentonite, the thixotropic agent is ETR-200, the amine curing agent is polyamide 650, the ultraviolet absorber is 1010, the dehydrating agent is vinyltrimethoxysilane, the epoxy resin is E54, the color powder is titanium dioxide, and the catalyst is organic tin.

[0046] Step 3: Mixing: The volume ratio of component A and component B is 1:1.

[0047] Step 4: Curing: Curing at room temperature under natural conditions.

[0048] Example 2

[0049] Example 2 is basically the same as Example 1, except that the types and amounts of specific raw materials are selected. The differences are as follows:

[0050] Component A: 80 parts of silane-modified polyether polymer, 4 parts of thixotropic agent, 15 parts of amine curing agent, 1 part of ultraviolet absorber, 2 parts of water remover, and 0.5 parts of catalyst;

[0051] Component B: 80 parts of epoxy resin, 6 parts of thixotropic agent, 5 parts of color powder, 15 parts of filler, 3 parts of diluent;

[0052] Among them, the silane-modified polyether polymer is MS resin RISUN-350A, with medium-low activity, medium modulus, viscosity 30000-50000mpa.s, tensile strength 3MPa, and elongation at break 500%; the diluent is deionized water, the filler is modified nano calcium carbonate CCS-25, the thixotropic agent is ETR-200, the color powder is titanium dioxide, and the catalyst is organic tin.

[0053] Example 3

[0054] Example 3 is basically the same as Example 1, except that the types and amounts of specific raw materials are selected. The differences are as follows:

[0055] Component A: 90 parts of silane-modified polyether polymer, 4 parts of thixotropic agent, 10 parts of amine curing agent, 2 parts of ultraviolet absorber, 1 part of water remover, and 0.15 parts of catalyst;

[0056] Component B: 90 parts of epoxy resin, 4 parts of thixotropic agent, 5 parts of color powder, 10 parts of filler, and 2 parts of diluent.

[0057] Among them, the silane-modified polyether polymer is MS resin SAX-750, which has high activity, medium modulus, viscosity of 20000-30000mpa.s, tensile strength of 1.2MPa, and elongation at break of 300%; the thixotropic agent is ETR-200, the amine curing agent is polyamide 650, the ultraviolet absorber is 1010, the dehydrating agent is vinyltrimethoxysilane, the epoxy resin is E54, and the catalyst is chelated tin; chelated tin is a highly active catalyst, a colorless and transparent liquid, and has a viscosity of 500-1000mpa.s.

[0058] Example 4

[0059] Example 4 is basically the same as Example 1, except that the types and amounts of specific raw materials are selected. The differences are as follows:

[0060] Component A: 100 parts of silane-modified polyether polymer, 10 parts of thixotropic agent, 20 parts of amine curing agent, 5 parts of ultraviolet absorber, 5 parts of water remover, and 2 parts of catalyst;

[0061] Component B: 100 parts of epoxy resin, 10 parts of thixotropic agent, 30 parts of color powder, 20 parts of filler, 5 parts of diluent;

[0062] The silane-modified polyether polymer is MS resin RISUN-350A, the diluent is deionized water, the filler is modified nano calcium carbonate CCS-25, the thixotropic agent is ETR-200, and the catalyst is chelated tin; chelated tin is a highly active catalyst, a colorless transparent liquid, and a viscosity of 500-1000mpa.s.

[0063] Comparative Example 1

[0064] Comparative Example 1 provides a high-toughness MS epoxy hybrid caulking agent for home decoration similar to Example 1, the difference lies in the selection of specific raw material types, and the differences are as follows.

[0065] Component A: 100 parts of polyamide 650, 5 parts of ETR-200, 2 parts of 1010;

[0066] Component B: 100 parts of epoxy resin E54, 6 parts of ETR-200, 5 parts of titanium dioxide, and 5 parts of CCS-25.

[0067] Comparative Example 2

[0068] Comparative Example 2 provides a high-toughness MS epoxy hybrid caulking agent for home decoration similar to Example 1, the difference lies in the selection of specific raw material types, and the differences are as follows.

[0069] Component A: 100 parts of silane-modified polyether polymer RISUN-350A, 5 parts of ETR-200, 1 part of 1010, 2 parts of dewatering agent, and 0.5 parts of organic tin;

[0070] Component B: 100 parts of polyamide 650, 5 parts of ETR-200, 5 parts of titanium dioxide, and 10 parts of deionized water.

[0071] Comparative Example 3

[0072] Comparative Example 3 provides a high-toughness MS epoxy hybrid caulking agent for home decoration similar to Example 1, the difference lies in the selection of specific raw material types, and the differences are as follows.

[0073] Component A: 100 parts of polyamide 650, 5 parts of ETR-200, 1 part of 1010;

[0074] Component B: 100 parts of CTBN modified epoxy resin RA1340, 5 parts of ETR-200, and 5 parts of titanium dioxide.

[0075] Comparative Example 4

[0076] Comparative Example 4 provides a high-toughness MS epoxy hybrid caulking agent for home decoration similar to Example 1, the difference lies in the selection of specific raw material types, and the differences are as follows.

[0077] Component A: 100 parts of silane-modified polyether polymer RISUN-350A, 5 parts of ETR-200, 1 part of 1010, and 2 parts of dewatering agent;

[0078] Component B: 100 parts of epoxy resin, 5 parts of ETR-200, 5 parts of titanium dioxide, and 10 parts of deionized water.

[0079] Experimental Example 1 Performance Test

[0080] Table 1 shows the relevant data of the room temperature curing test of the caulking agent prepared in the above embodiments and comparative examples after being filled into the gaps between tiles with a manual glue gun and applied with the caulking agent.

[0081] Table 1

[0082]

[0083] As shown in Table 1, the MS epoxy hybrid caulking agent provided by the embodiment of the present invention and the comparative example are constructed, maintained, and aged under the same environment. Examples 1 to 5 and comparative example 2 can be cured under water vapor conditions, while comparative example 1 and comparative example 3 cannot be cured. This is because the moisture in the air of the silane-modified polyether is equivalent to a catalyst in a humid environment, which can promote its cross-linking and curing, while epoxy resin and amine curing agents cannot achieve this. The total volatile organic compound test results show that the MS epoxy hybrid caulking agent prepared by silane-modified polyether is more environmentally friendly. The tensile strength and elongation at break test results show that the caulking agent prepared by epoxy resin and amine curing agent in Examples 1 to 5 and Comparative Example 2 is much higher than that in Comparative Example 1. Although Comparative Example 3 uses modified epoxy resin for toughening, its tensile strength and elongation are still not comparable to those of silane-modified polyether polymers. This is because the silane-modified polyether polymer has a much larger silicon-oxygen-silicon bond energy than the carbon-oxygen-carbon bond energy of epoxy resin, and the molecules can rotate freely, so it has higher flexibility. At the same time, it is hybridized and cured with epoxy resin with high hardness and strength, which improves the overall tensile strength of MS epoxy hybrid caulking agent and has a higher elongation at break. Although Comparative Example 2 is comparable to the embodiment in terms of aging resistance and water vapor curing performance, it is not hybridized with epoxy resin and has lower strength. In terms of the aging performance of double 85 (humidity 85%, temperature 85°C), Examples 1 to 5 have a good retention rate, while the tensile strength and elongation at break of Comparative Examples 2 and 3 are significantly attenuated after aging at double 85. Therefore, in terms of weather resistance, epoxy resin and amine curing agent are not as good as MS epoxy hybrid seam beautifying agent. Although Comparative Example 4 is also a hybrid of silane-modified polyether polymer and epoxy resin, no catalyst is added to the silane-modified polyether polymer component, and the epoxy resin component lacks a compound for cross-linking and curing with it, so it does not cure, and the performance of its cured product is significantly deteriorated.

[0084] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A highly flexible epoxy seam sealant, characterized in that: The invention is composed of component A and component B. Component A includes 60-100 parts of silane-modified polyether polymer, 0-20 parts of amine curing agent, 0-10 parts of thixotropic agent, 0-5 parts of ultraviolet absorber, 0-5 parts of dewatering agent and 0-2 parts of catalyst, and component B includes 60-100 parts of epoxy resin, 0-10 parts of thixotropic agent, 0-30 parts of color powder, 0-20 parts of filler and 0-5 parts of diluent, calculated by volume.

2. A highly flexible epoxy seam sealant according to claim 1, characterized in that: The volume ratio of component A to component B is 1:

1.

3. A highly flexible epoxy seam sealant according to claim 2, characterized in that: The silane-modified polyether polymer is at least one of SAX-750, FS-S8 and RISUN-350A.

4. A highly flexible epoxy seam sealant according to claim 3, characterized in that: The amine curing agent is at least one of polyamide 650 and alicyclic amine IPDA.

5. The high-flexibility epoxy seam sealant according to claim 4, characterized in that: The thixotropic agent is at least one of nano calcium carbonate, fumed silica, polyamide wax and organic bentonite, and the specific surface area of ​​the fumed silica is 150 square meters per gram.

6. The high-flexibility epoxy seam sealant according to claim 5, characterized in that: The ultraviolet absorber is at least one of UV7210, JC-1403, and antioxidant 1010; the dehydrating agent is at least one of molecular sieve, soda lime, and vinyl trimethoxy silane.

7. A highly flexible epoxy seam sealant according to claim 6, characterized in that: The catalyst is at least one of organic tin and chelated tin.

8. The high-flexibility epoxy seam sealant according to claim 7, characterized in that: The epoxy resin is E54 or E51; the color powder is at least one of titanium dioxide, pearlescent pigment and PET powder; the filler is at least one of calcium sulfate, nano-active calcium carbonate, bentonite and transparent powder.

9. The high-flexibility epoxy seam sealant according to claim 8, characterized in that: The diluent is at least one of polyethylene glycol diglycidyl ether, benzyl alcohol, propylene carbonate and deionized water.

10. A method for preparing a highly flexible epoxy seam sealant according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, preparation of component A: mixing and degassing the silane-modified polyether polymer, the amine curing agent, the thixotropic agent, the ultraviolet absorber, the dehydrating agent and the catalyst under vacuum conditions to obtain component A; Step 2, preparation of component B: mixing epoxy resin, color powder, thixotropic agent, filler and diluent uniformly and degassing under vacuum conditions to obtain component B; Step 3: Mixing: When using, mix component A and component B in a volume ratio of 1:1 to obtain an AB mixture.

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