Two-component epoxy seam beautifying agent and preparation method thereof

Abstract

The present invention relates to a two-component epoxy seam beautifying agent and a preparation method thereof. When used, the two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:0.8-1.2. The component A includes the following components: bisphenol A epoxy resin, bisphenol F epoxy resin, diluent, fumed silica, filler, modified hollow microspheres, and defoamer; the component B includes the following components: amine composition, fumed silica, silane coupling agent, filler, modified hollow microspheres, thixotropic agent, and pigment; the modified hollow microspheres in the components A and B are all modified hollow microspheres obtained by pre-treating the hollow microspheres with an aluminate coupling agent. The invention overcomes the shortcomings of the existing two-component epoxy seam beautifying agent, such as low solid content, poor adhesion and toughness, and adopts special modified hollow microspheres, matched with two bisphenol epoxy resins and silane coupling agents, and has the advantages of high solid content, small specific gravity, low shrinkage, good adhesion and toughness.

Description

Technical Field

[0001] The invention relates to a two-component epoxy seam beautifying agent and a preparation method thereof, and is applied in the field of seam beautifying agent production. Background Art

[0002] Two-component epoxy caulking agent is generally a decorative material for tile caulking made of epoxy resin, curing agent, fumed silica and pigment. It has the characteristics of hardness, firmness, waterproofness and beauty. In order to make the glue flow smoothly during construction and improve the problem of brittleness of two-component epoxy caulking agent caused by excessive strength of epoxy resin, a certain amount of solvent is generally added to the system to provide toughness. Epoxy resin itself is linear and thermoplastic; after adding curing agent, the solidified material presents a three-dimensional network structure, which is hard and brittle in nature. The general choice of caulking agent solvent is diluent (such as Wuhan Organic BA), which is divided into active and inactive. In the early stage, it can directly affect the viscosity of the resin, reduce the cross-linking density, and increase toughness, but it will also affect its strength. Epoxy curing agent and additives [M]. Chemical Industry Press: Hu Yuming, 2011. It mentions diluents and toughening agents. The inventor of this case's paper "The Effect of Diluents on the Performance of Two-Component Epoxy Sealing Agents" (Collection of Papers from the 25th National Academic Exchange Conference on Epoxy Resin Application Technology and the Celebration Conference for the 40th Anniversary of the Development of Epoxy Resin Application Technology in China) explains the toughening effect of diluents on seaming agents.

[0003] However, the general two-component epoxy caulking agent will react and release heat during the curing process. The solvent in the system will volatilize due to the heat release, which will reduce the overall solid content of the caulking agent. This is inevitable during the curing process. And as the curing strength of the caulking agent increases, the overall toughness becomes worse. In the later curing process, temperature and ultraviolet rays will accelerate its aging, causing the shrinkage of the adhesive strip, which will lead to a decrease in its adhesion to the tile, thus causing the caulking agent to fall off.

[0004] Therefore, it is urgent to provide a two-component epoxy seam sealant with high solid content, low specific gravity, low shrinkage, good adhesion and toughness and a preparation method thereof. Summary of the invention

[0005] In order to overcome the shortcomings of the existing two-component epoxy seam beautifying agent, such as low solid content, poor adhesion and toughness, the present invention provides a two-component epoxy seam beautifying agent and a preparation method thereof, which adopts special modified hollow microspheres, is matched with two bisphenol epoxy resins and a silane coupling agent, and works synergistically with preferred component types in the system such as fumed silica, fillers, diluents, etc. and their usage ratios, and has the advantages of high solid content, small specific gravity, low shrinkage, good adhesion and toughness.

[0006] The technical solution of the present invention is as follows:

[0007] A two-component epoxy seam sealant, comprising component A and component B.

[0008] The A component is mainly prepared from the following components in the following mass proportions:

[0009]

[0010]

[0011] The B component is mainly prepared from the following components in the following mass proportions:

[0012]

[0013] The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

[0014] The two-component epoxy seam beautifier of the present application adopts special modified hollow microspheres, with two bisphenol epoxy resins and silane coupling agents, and synergistically with the preferred component types in the system such as fumed silica, fillers, diluents, etc. and their dosage ratios, and has the advantages of high solid content and low specific gravity (the minimum solid content is not less than 94.5%, and the specific gravity is 1.3-1.35 for normal production with fillers), low shrinkage, good adhesion and toughness. The modified hollow microspheres are all modified hollow microspheres obtained by pre-treating the hollow microspheres with aluminate coupling agents. The preparation process is: mixing and stirring a solution composed of glass microspheres, aluminate coupling agents and low boiling point solvents, and then drying in an oven after high-speed dispersion. The use of modified hollow microspheres can greatly reduce the shedding problems of existing seam beautifiers due to low solid content, poor toughness, and large shrinkage, which can reduce the specific gravity of the seam beautifier, save costs, and reduce shrinkage, improve adhesion and toughness. The preferred bisphenol A epoxy resin, bisphenol F epoxy resin and their usage ratio, as well as fumed silica and fillers can improve thixotropy and strength. The diluent has a diluting effect and improves toughness. The silane coupling agent contained in the B component is used to reduce the viscosity of the B component of the seam beautifying agent and treat the surface of the substrate, which can improve the adhesion of the seam beautifying agent. Ordinary hollow microspheres that have not been modified may have the risk of deactivation due to reaction with the silane coupling agent, and adding modified hollow microspheres can avoid the problem of premature consumption of the silane coupling agent.

[0015] This two-component epoxy caulking agent can be directly filled into the gap after the tiles, mosaics, stones and other materials are pasted. It is suitable for the use of glue guns and glue mixing nozzles for various types of gap filling construction. Increase the overall solid content of the caulking agent, increase the toughness of the caulking agent, and reduce the toughness problem of the caulking agent caused by solvent volatilization. Compared with other coupling agents (such as titanates, borates, etc.), the hollow microspheres modified with aluminate coupling agents have stable quality, light color, non-toxicity and low odor. The hollow microspheres activated and modified by aluminate coupling agents have an organic molecular layer generated by chemical or physicochemical reactions on their surfaces, changing from hydrophilic to organic. After the surface of hollow microspheres is modified by aluminate coupling agent, they are used in two-component epoxy seam beautifiers. The inorganic-philic end and organic-philic end of the coupling agent can react chemically with the surface of hollow microspheres and epoxy resin or form entangled structures, respectively, which enhances the interfacial compatibility between hollow microspheres and organic resins. Therefore, modification with aluminate coupling agent can not only improve the processing performance of filled hollow microspheres, but also significantly improve the physical and mechanical properties of seam beautifiers, reduce the water absorption rate of the product, reduce the oil absorption, and evenly disperse the filler. For seam beautifiers, the amount of filler can be greatly increased, the production cost can be reduced, and thus it has obvious economic benefits. The modified hollow microspheres are smaller in size than general hollow microspheres (general hollow glass microspheres are generally 180-220 mesh, while the modified hollow microspheres are about 40 mesh), and have better dispersibility in the resin and mechanical properties of the cured product. At the same time, the introduction of modified hollow microspheres improves the thermal properties of the bisphenol epoxy resin in the system, reduces the linear curing shrinkage and density, and can significantly improve the shedding problem caused by the large shrinkage while reducing costs. The modified hollow microspheres do not have the disadvantage of reducing hardness after adding general hollow microspheres, and can significantly improve the adhesion of the seam beautifier. In addition, the same modified hollow microspheres with the same content are added to the A and B component systems, which can ensure that the difference in the amount of fillers on both sides is small and the glue discharge speed of the rubber strip is consistent.

[0016] The fillers in components A and B are both transparent powders.

[0017] Transparent powder will not directly react with silane coupling agent and can increase the solid content of the caulking agent.

[0018] The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:0.8-1.2 when used.

[0019] The two-component epoxy seam sealant is easy to use and only requires simple mixing of components A and B.

[0020] The preparation method of the two-component epoxy seam beautifying agent comprises the following steps performed in sequence:

[0021] (I) Preparation of component A

[0022] (1) starting a stirrer and adjusting the stirrer speed to 500-800 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0023] (2) Adjust the speed to 600-1000 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles;

[0024] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 to -0.12 MPa, and adjust the stirring speed to 800-1200 r / min, stir for at least 60 min, then stop stirring to obtain component A;

[0025] (II) Preparation of component B

[0026] (1) starting a stirrer and adjusting the stirrer speed to 500-800 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0027] (2) Adjust the speed to 600-1000 r / min, continue to add fillers, modified hollow microspheres, thixotropic agents and pigments into the mixer, and disperse until there are no particles;

[0028] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 to -0.12 MPa, and adjust the stirring speed to 800-1200 r / min, stir for at least 60 minutes, then stop stirring to obtain component B.

[0029] The preparation method of the two-component epoxy seam beautifying agent has simple steps and is easy to operate.

[0030] The specific method for detecting the particle-free state of components A and B in step (2) is as follows: take samples twice and scrape them onto wet films of black and white cardboard respectively. Only when the test confirms that there are no particles can the next step be continued. If the sample fails to meet the requirements, continue to disperse the sample until it meets the requirements.

[0031] The preparation method of the two-component epoxy seam beautifying agent further includes step (iii): when in use, mixing component A and component B in a mass ratio of 1:0.8-1.2 to obtain the two-component epoxy seam beautifying agent.

[0032] The two-component epoxy seam sealant is easy to use and only requires simple mixing of components A and B.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1) The two-component epoxy seam sealant of the present application uses specially modified hollow microspheres, two bisphenol epoxy resins, and a silane coupling agent, and works synergistically with the preferred component types in the system such as fumed silica, fillers, diluents, etc. and their dosage ratios, and has the advantages of high solid content, low specific gravity, low shrinkage, good adhesion and toughness;

[0035] 2) The two-component epoxy seam sealant is easy to use, and only requires simple mixing of components A and B;

[0036] 3) The preparation method of the two-component epoxy seam beautifying agent has simple steps and is easy to operate. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments.

[0038] Example 1

[0039] The two-component epoxy seam beautifying agent of the present invention comprises component A and component B.

[0040] The A component is mainly prepared from the following components in the following mass proportions:

[0041]

[0042] The B component is mainly prepared from the following components in the following mass proportions:

[0043]

[0044] The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

[0045] The fillers in components A and B are both transparent powders.

[0046] The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:1 when used.

[0047] The preparation method of the two-component epoxy seam beautifying agent comprises the following steps performed in sequence:

[0048] (I) Preparation of component A

[0049] (1) starting a stirrer and adjusting the stirrer speed to 600 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0050] (2) Adjust the speed to 800 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles;

[0051] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.1 MPa, and adjust the stirring speed to 1000 r / min, stir for 60 min, and then stop stirring to obtain component A;

[0052] (II) Preparation of component B

[0053] (1) starting a stirrer and adjusting the stirrer speed to 600 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing them until they are uniformly mixed;

[0054] (2) Adjust the speed to 800 r / min, continue to add filler, modified hollow microspheres, thixotropic agent and pigment into the mixer, and disperse until there are no particles;

[0055] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.1 MPa, and adjust the stirring speed to 1000 r / min, stir for 60 minutes, and then stop stirring to obtain component B.

[0056] The preparation method of the two-component epoxy seam beautifying agent also includes step (iii): when using, mixing component A and component B in a mass ratio of 1:1 to obtain the two-component epoxy seam beautifying agent.

[0057] Example 2

[0058] The two-component epoxy seam beautifying agent of the present invention comprises component A and component B.

[0059] The A component is mainly prepared from the following components in the following mass proportions:

[0060]

[0061] The B component is mainly prepared from the following components in the following mass proportions:

[0062]

[0063]

[0064] The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

[0065] The fillers in components A and B are both transparent powders.

[0066] The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:0.8 when in use.

[0067] The preparation method of the two-component epoxy seam beautifying agent comprises the following steps performed in sequence:

[0068] (I) Preparation of component A

[0069] (1) starting a stirrer and adjusting the stirrer speed to 500 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0070] (2) Adjust the speed to 600 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles;

[0071] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 MPa, and adjust the stirring speed to 800 r / min, stir for 65 min, and then stop stirring to obtain component A;

[0072] (II) Preparation of component B

[0073] (1) starting a stirrer and adjusting the stirrer speed to 500 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing them until they are uniformly mixed;

[0074] (2) Adjust the speed to 600 r / min, continue to add filler, modified hollow microspheres, thixotropic agent and pigment into the mixer, and disperse until there are no particles;

[0075] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 MPa, and adjust the stirring speed to 1200 r / min, stir for 65 minutes, and then stop stirring to obtain component B.

[0076] The preparation method of the two-component epoxy seam beautifying agent further includes step (iii): when in use, mixing component A and component B in a mass ratio of 1:0.8 to obtain the two-component epoxy seam beautifying agent.

[0077] Example 3

[0078] The two-component epoxy seam beautifying agent of the present invention comprises component A and component B.

[0079] The A component is mainly prepared from the following components in the following mass proportions:

[0080]

[0081]

[0082] The B component is mainly prepared from the following components in the following mass proportions:

[0083]

[0084] The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

[0085] The fillers in components A and B are both transparent powders.

[0086] The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:1.2 when used.

[0087] The preparation method of the two-component epoxy seam beautifying agent comprises the following steps performed in sequence:

[0088] (I) Preparation of component A

[0089] (1) starting a stirrer and adjusting the stirrer speed to 800 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0090] (2) Adjust the speed to 1000 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles;

[0091] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.12 MPa, and adjust the stirring speed to 1200 r / min, stir for 70 min, and then stop stirring to obtain component A;

[0092] (II) Preparation of component B

[0093] (1) starting a stirrer and adjusting the stirrer speed to 800 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing them until they are uniformly mixed;

[0094] (2) Adjust the speed to 1000 r / min, continue to add filler, modified hollow microspheres, thixotropic agent and pigment into the mixer, and disperse until there are no particles;

[0095] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.12 MPa, and adjust the stirring speed to 800 r / min, stir for 70 minutes, and then stop stirring to obtain component B.

[0096] The preparation method of the two-component epoxy seam beautifying agent further includes step (iii): when in use, mixing component A and component B in a mass ratio of 1:1.2 to obtain the two-component epoxy seam beautifying agent.

[0097] Example 4

[0098] The two-component epoxy seam beautifying agent of the present invention comprises component A and component B.

[0099] The A component is mainly prepared from the following components in the following mass proportions:

[0100]

[0101] The B component is mainly prepared from the following components in the following mass proportions:

[0102]

[0103] The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

[0104] The fillers in components A and B are both transparent powders.

[0105] The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:0.8 when in use.

[0106] The preparation method of the two-component epoxy seam beautifying agent comprises the following steps performed in sequence:

[0107] (I) Preparation of component A

[0108] (1) starting a stirrer and adjusting the stirrer speed to 500 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0109] (2) Adjust the speed to 600 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles;

[0110] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 Pa, and adjust the stirring speed to 1000 r / min, stir for 65 min, and then stop stirring to obtain component A;

[0111] (II) Preparation of component B

[0112] (1) starting a stirrer and adjusting the stirrer speed to 500 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing them until they are uniformly mixed;

[0113] (2) Adjust the speed to 600 r / min, continue to add filler, modified hollow microspheres, thixotropic agent and pigment into the mixer, and disperse until there are no particles;

[0114] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 MPa, and adjust the stirring speed to 1200 r / min, stir for 65 minutes, and then stop stirring to obtain component B.

[0115] The preparation method of the two-component epoxy seam beautifying agent further includes step (iii): when in use, mixing component A and component B in a mass ratio of 1:0.8 to obtain the two-component epoxy seam beautifying agent.

[0116] Example 5

[0117] The two-component epoxy seam beautifying agent of the present invention comprises component A and component B.

[0118] The A component is mainly prepared from the following components in the following mass proportions:

[0119]

[0120] The B component is mainly prepared from the following components in the following mass proportions:

[0121]

[0122] The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

[0123] The fillers in components A and B are both transparent powders.

[0124] The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:1 when used.

[0125] The preparation method of the two-component epoxy seam beautifying agent comprises the following steps performed in sequence:

[0126] (I) Preparation of component A

[0127] (1) starting a stirrer and adjusting the stirrer speed to 600 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed;

[0128] (2) Adjust the speed to 800 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles;

[0129] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.1 MPa, stir at high speed for 60 minutes, then stop stirring to obtain component A;

[0130] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.1 MPa, and adjust the stirring speed to 1200 r / min, stir for 60 min, then stop stirring to obtain component A;

[0131] (II) Preparation of component B

[0132] (1) starting a stirrer and adjusting the stirrer speed to 600 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing them until they are uniformly mixed;

[0133] (2) Adjust the speed to 800 r / min, continue to add filler, modified hollow microspheres, thixotropic agent and pigment into the mixer, and disperse until there are no particles;

[0134] (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.1 MPa, and adjust the stirring speed to 800 r / min, stir for 60 minutes, and then stop stirring to obtain component B.

[0135] The preparation method of the two-component epoxy seam beautifying agent also includes step (iii): when using, mixing component A and component B in a mass ratio of 1:1 to obtain the two-component epoxy seam beautifying agent.

[0136] Raw material information involved in each embodiment:

[0137] Bisphenol A epoxy resin: Nan Ya NPEL-128R

[0138] Bisphenol F epoxy resin: Nan Ya NPEL-170

[0139] Diluent: Wuhan Organic BA

[0140] Fumed silica: Cabot M5

[0141] Filler: Transparent powder: Shunweiye, Koliner T507B

[0142] Modified hollow microspheres: Zhengzhou Shenglait CM6030

[0143] Defoaming agent: TEGO900

[0144] Amine composition: Rich 3609-2

[0145] Silane coupling agent: Shandong Sike KH-550

[0146] Thixotropic agent: ANJEKA-4610

[0147] Pigment: Shanghai Yanbei 8117.

[0148] Experimental data:

[0149] Comparative Example 1: Universal seam beautifying agent, which differs from Example 1 in that: modified hollow microspheres CM6030 are not added, and the filler ratios in components A and B are slightly different, as follows:

[0150]

[0151] Detection method:

[0152] (1) Yellowing resistance: in accordance with the provisions of GB / T 36797-2018;

[0153] (2) Adhesion: On a smooth tile surface of 30cm*30cm*2cm, use a caulking agent to bond an ingot, cure it at room temperature for 7 days, and use a tensile testing machine to test the pull-out force. The adhesion is required to be no less than 2MPa.

[0154] (3) Shore hardness: prepare a small silicone mold with a diameter of 3 cm and a thickness of 0.3 cm, inject the colloid into the mold, press it evenly and flatten it, cure it at room temperature for 24 hours, and measure the hardness with a Shore D durometer, which is required to be greater than 55D;

[0155] (4) Solid content: According to the test of volatile organic compound limits for bulk adhesives in GB 33372-2020; solid content is calculated by VOC;

[0156] (5) Specific gravity: Tested in a 37 ml coating specific gravity cup;

[0157] (6) Elongation at break: tested according to GB / T 2567-2008;

[0158] (7) Shrinkage rate: Tested in accordance with T / CECS10080-2020.

[0159] Various performance tests were performed on Examples 1-5 and Comparative Example 1, and the results are shown in Table 2.

[0160] Table 2 Performance test results

[0161]

[0162] It can be seen from the above table that the high-filler, low-specific-gravity caulking agent applied for in this patent has lower shrinkage, better adhesion, higher elongation at break, higher hardness and solid content, better yellowing resistance and low specific gravity, which can save a lot of costs.

[0163] In summary, Example 5 is the best solution. Compared with Comparative Example 1 (universal caulking agent, no modified hollow microspheres), the solid content of the caulking agent in Example 5 is increased by 1.76%, the adhesion is increased by 1.92 times, and the shrinkage rate is also reduced by 43.4%, which effectively avoids the subsequent impact of the caulking agent falling off due to shrinkage migration. The reduction in specific gravity also greatly reduces the production cost. Under the condition of the same canned volume, the canned weight is greatly reduced; the yellowing resistance △E is increased by 2 times, which is very advantageous for the production of light-colored caulking agents, and increases the yellowing resistance life of outdoor caulking agents; the elongation at break is increased by 121%, and the increase in toughness improves the cracking and falling off caused by toughness problems during the long-term use of the caulking agent.

Claims

1. A two-component epoxy seam beautifying agent, characterized in that: It includes component A and component B. The A component is mainly prepared from the following components in the following mass proportions: The B component is mainly prepared from the following components in the following mass proportions: The modified hollow microbeads in the A and B components are all obtained by pre-treating the hollow microbeads with an aluminate coupling agent.

2. The two-component epoxy seam sealant according to claim 1, characterized in that: The fillers in components A and B are both transparent powders.

3. The two-component epoxy seam sealant according to claim 1, characterized in that: The two-component epoxy seam beautifying agent is prepared by mixing component A and component B in a mass ratio of 1:0.8-1.2 when used.

4. The method for preparing the two-component epoxy seam sealant according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: (a) preparing component A (1) starting a stirrer and adjusting the stirrer speed to 500-800 r / min, adding bisphenol A epoxy resin, bisphenol F epoxy resin and diluent into the stirrer, and dispersing until the mixture is uniformly mixed; (2) Adjust the speed to 600-1000 r / min, continue to add fumed silica, filler, modified hollow microspheres and defoamer into the mixer, and disperse until there are no particles; (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 to -0.12 MPa, and adjust the stirring speed to 800-1200 r / min, stir for at least 60 min, then stop stirring to obtain component A; (II) Preparation of component B (1) starting a stirrer and adjusting the stirrer speed to 500-800 r / min, adding an amine composition, fumed silica and a silane coupling agent into the stirrer, and dispersing until the mixture is uniformly mixed; (2) Adjust the speed to 600-1000 r / min, continue to add fillers, modified hollow microspheres, thixotropic agents and pigments into the mixer, and disperse until there are no particles; (3) Turn on the vacuum pump and vacuum valve of the mixer to make the vacuum degree in the mixer reach -0.08 to -0.12 MPa, and adjust the stirring speed to 800-1200 r / min, stir for at least 60 minutes, then stop stirring to obtain component B.

5. The method for preparing the two-component epoxy seam sealant according to claim 4, characterized in that: The method further comprises step (iii): when using, mixing component A and component B in a mass ratio of 1:0.8-1.2 to obtain the two-component epoxy seam beautifying agent.

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