Double-tube environment-friendly epoxy colored sand as well as preparation method and application thereof

Abstract

The invention discloses double-tube environment-friendly epoxy colored sand as well as a preparation method and application thereof, and belongs to the technical field of epoxy colored sand sealant. The double-tube environment-friendly epoxy colored sand comprises a component A and a component B, and the volume ratio of the component A to the component B is 1: 1. The component A is prepared from hydrophilic solvent-free epoxy resin, filler, pigment, high-performance hollow glass beads, hydrophilic vapor-phase silicon dioxide and hydrophobic vapor-phase silicon dioxide; the component B is prepared from a modified polyamide curing agent, filler, high-performance hollow glass beads, hydrophilic vapor-phase silicon dioxide, pigment and a modified thixotropic agent. The modified polyamide curing agent is ingeniously used, so that the system has hydrophilicity, can be scrubbed with clear water, and can be used for batch scraping construction and gluing construction. Meanwhile, due to the use of the modified thixotropic agent, the sand-containing system has good gluing property and thixotropy. In addition, the hollow glass beads with high vacuum rate are used as the supplement of the filler, so that the gluing hand feeling, the gluing efficiency and the construction area are greatly improved on the premise of not influencing the gloss.

Description

Technical Field

[0001] The invention belongs to the technical field of epoxy colored sand seam beautifying agents, and in particular relates to a double-tube environmentally friendly epoxy colored sand, a preparation method and application thereof. Background Art

[0002] Epoxy colored sand caulking agent has been widely used in the field of interior decoration due to its rich colors, unique matte texture, wear resistance, easy cleaning, environmental health, simple construction and strong adaptability. However, despite these advantages, epoxy colored sand still faces some problems and challenges in its actual application.

[0003] First, in order to enhance the washability and frosted texture, the barreled epoxy colored sand on the market currently adds a lot of emulsifiers and fillers, but ignores the important performance properties such as stain resistance and environmental protection. Secondly, the construction method of barreled epoxy colored sand also has certain limitations. Traditional barreled epoxy colored sand is usually constructed by scraping. This method has low construction efficiency and is difficult to guarantee construction quality when facing large-area straight seams.

[0004] Although there are some double-tube epoxy colored sand products on the market that use glue guns for glue application, most of them are oily products. Such products usually do not support the construction method of directly scrubbing with clean water after scraping. In addition, due to the increase in sand content, most products on the market face problems such as high viscosity, difficulty in glue application, and even easy explosion of pipes. Some double-tube colored sand products that claim to support flat seam construction are often equipped with additional cleaning solvents, but these solvents often have a strong odor and their environmental protection cannot be effectively regulated.

[0005] Patent application publication CN 113683992 A, a weather-resistant textured caulking agent and its preparation method, mentions that a large amount of hollow beads are added to reduce the feel of gluing. However, according to the hollow bead addition ratio disclosed in the patent application, the stain resistance of the product will be greatly affected. Patent application publication CN 115521739A, a water-based water-resistant white epoxy colored sand tile caulking agent and its preparation method, mentions that a dehydrating agent (silane-terminated polyether resin) is used to speed up the reaction and reduce the water whitening phenomenon caused by the mixture of water vapor and water-based curing agent. However, the product cannot be scrubbed with clean water. Summary of the invention

[0006] The invention aims to solve the problems existing in the prior art, and to provide a double-tube environmentally friendly epoxy colored sand, a preparation method and its application. The double-tube environmentally friendly epoxy colored sand cleverly uses high-performance hollow glass microspheres with a high vacuum rate as a supplement to the filler, so that the use area of ​​the material is significantly improved under the same quality; the extrusion force required for glue application is significantly reduced, which greatly improves the feel and efficiency of glue application. In addition, compared with conventional water-based epoxy colored sand and solvent-based epoxy colored sand, the present invention uses a hydrophilic solvent-free epoxy resin and a modified polyamide curing agent system, which has the advantages of low VOC, high solid content, low shrinkage rate and high bonding strength. The double-tube environmentally friendly epoxy colored sand of the present invention not only supports glue application construction, but also can be constructed by scraping, which greatly improves the convenience of construction. What is more gratifying is that after scraping, it can be easily scrubbed with clean water, and there will be no water whitening phenomenon after scrubbing, and flat seam construction can be achieved, which effectively solves the problem that non-environmentally friendly cleaning solvents need to be equipped in the scrubbing process of traditional colored sand.

[0007] The first invention object of the present invention is:

[0008] Provided is a double-tube environmentally friendly epoxy colored sand, which includes component A and component B, and the volume ratio thereof is 1:1;

[0009] The A component comprises the following raw material components in parts by weight:

[0010] 50-90 parts of hydrophilic solvent-free epoxy resin, 10-30 parts of filler, 0-8 parts of pigment, 1-5 parts of high-performance hollow glass microspheres, 1-5 parts of hydrophilic fumed silica, and 1-5 parts of hydrophobic fumed silica;

[0011] The B component comprises the following raw material components in parts by weight:

[0012] 40-80 parts of modified polyamide curing agent, 5-45 parts of filler, 1-5 parts of high-performance hollow glass microspheres, 1-5 parts of hydrophilic fumed silica, 0-20 parts of pigment, 0.2-1 parts of modified thixotropic agent;

[0013] The high-performance hollow glass microspheres are hollow glass microspheres with a particle size of 25 to 75 microns and a true density of 0.15 to 0.3 g / cm 3 , compressive strength ≥ 20Mpa. Hollow glass microspheres are a kind of hollow spherical powder ultra-light inorganic non-metallic material. The unique hollow sphere shape of hollow glass microspheres gives them the following advantages: high filling rate, reduced viscosity, improved fluidity, and reduced shrinkage and warping of products. The high-performance hollow glass microspheres selected by the present invention can be well integrated with the resin. Compared with higher true density hollow glass microspheres, the high-performance hollow glass microspheres selected by the present invention can significantly improve the density and feel by adding a small amount, and have little effect on the system's stain resistance, glossiness and other properties, and can still achieve a glossiness of more than 90.

[0014] The modified polyamide curing agent comprises the following components in parts by weight:

[0015] 10-20 parts of polyetheramine, 10-20 parts of low viscosity HMDA, 20-30 parts of amidoamine, 20-30 parts of high boiling point diluent, 10-20 parts of epoxy resin;

[0016] The high boiling point diluent has a boiling point of 280° C. The low viscosity HMDA has a viscosity range of 60 to 80 mPa·s at 25° C., which can ensure that the product has good environmental performance and construction properties.

[0017] The modified polyamide curing agent can ensure that the product has good yellowing resistance and shrinkage resistance.

[0018] The modified thixotropic agent comprises the following components in parts by weight:

[0019] 30-40 parts of C18-unsaturated fatty acid, 25-35 parts of polyalkylene amine, 10-20 parts of epoxy resin, and 10-20 parts of high boiling point diluent;

[0020] The molar ratio of C18-unsaturated fatty acid to polyalkyleneamine is 1:1.

[0021] The modified thixotropic agent is a modified polyamide thixotropic agent. It has active hydroxyl groups on its surface, which can generate hydrogen bonds with hydrophilic fumed silica containing hydroxyl groups to form a three-dimensional network structure, and has relatively stable thixotropy in the system. The special polymer structure of the thixotropic agent has better heat resistance than the system using fumed silica alone, and maintains thixotropy for a longer time.

[0022] The double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0023] The hydrophilic solvent-free epoxy resin is a 100% solid hydrophilic solvent-free epoxy resin containing a polyether structure or an amino-terminated polyether structure in its molecular structure. The polyether structure or the amino-terminated polyether structure in its molecular structure improves the brittleness of the epoxy resin, has hydrophilicity, but does not contain water. After the resin is combined with an amine curing agent, it can be dissolved in clean water during the reaction.

[0024] The double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0025] The filler is transparent glass micro beads or colored glass micro beads of 25 to 110 microns. Glass micro beads are tiny spheres with high fluidity and can reduce resistance during the gluing process.

[0026] The double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0027] The pigment is titanium dioxide, pearl powder, glitter powder or color paste.

[0028] The second object of the present invention is:

[0029] A method for preparing the double-tube environmentally friendly epoxy colored sand as described above is provided, which comprises the following preparation steps:

[0030] S1. Preparation of component A: Add hydrophilic solvent-free epoxy resin, pigment, hydrophilic fumed silica and hydrophobic fumed silica to a disperser in proportion for pre-dispersion, then add part of filler and high-performance hollow glass microspheres for dispersion, then adjust the color, continue to add the remaining part of high-performance hollow glass microspheres and the remaining part of filler, stir at a predetermined dispersion rate, disperse by vacuum, and fill into the tube of component A of the seam beautifier using a special filling machine;

[0031] S2. Preparation of component B: Add the modified polyamide curing agent, hydrophilic fumed silica and pigment into a disperser in proportion for pre-dispersion, then add part of the filler and part of the high-performance hollow glass microspheres for dispersion, then adjust the color, then add the remaining part of the high-performance hollow microspheres, the remaining part of the filler and the modified thixotropic agent, stir at a predetermined dispersion rate, disperse by vacuum, and fill into the tube of component B of the seam beautifier using a special filling machine.

[0032] The preparation method of the double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0033] The predetermined dispersion rate is 500-1000 rpm, and the wall scraping rate is 20-50 rpm.

[0034] The preparation method of the double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0035] The modified polyamide curing agent comprises the following preparation steps:

[0036] s1. First, polyetheramine, low-viscosity HMDA and 50% of a high-boiling-point diluent are thoroughly mixed and heated to 60°C, which is recorded as mixed sample 1.

[0037] s2. Mix the epoxy resin and 50% of the high boiling point diluent thoroughly and heat to 60°C, which is recorded as mixed sample 2.

[0038] s3. The mixed sample 2 was slowly added dropwise to the mixed sample 1 at a constant temperature of 60 ° C. After the addition, the temperature was kept for 30 minutes, and the temperature was raised to 80 ° C and continued to be maintained for 30 minutes;

[0039] s4. After the temperature drops naturally, the amidoamine is slowly added, mixed thoroughly, and maintained at 60° C. for 30 minutes to prepare the modified polyamide curing agent.

[0040] The preparation method of the double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0041] The modified thixotropic agent comprises the following preparation steps:

[0042] s1. C18-unsaturated fatty acid and polyalkyleneamine are placed in a reaction vessel in a molar ratio of 1:1, and the reaction vessel is filled with nitrogen for protection, and maintained at 150-200° C. for 1 h-2 h to remove moisture from the raw materials; then the temperature is increased to 250-300° C., a condensation reaction is carried out under normal pressure, and the reaction is naturally cooled to about 95-100° C. to obtain solution 1;

[0043] s2. Epoxy resin and high boiling point diluent are mixed evenly in a container and the temperature is raised to about 95-100°C as solvent 2;

[0044] s3. In the temperature range of 95 to 100°C and the rotation speed of 700 to 800 rpm, the solvent 2 is slowly added dropwise to the solution 1. After the addition is completed, the temperature is raised to 150°C and reacted for half an hour to prepare the modified polyamide thixotropic agent.

[0045] The third invention object of the present invention is:

[0046] Provide a construction method of the above-mentioned double-tube environmentally friendly epoxy colored sand:

[0047] Use a special glue gun for grouting agent to automatically mix component A and component B, that is, you can directly inject it into the gap between tiles to press the joints, and then remove the excess glue after solidification; or

[0048] Use a special glue gun for caulking agent to automatically mix component A and component B, then use a special caulking scraper or rubber spatula to compact the material into the gap and scrape off excess material; after the gap has been filled for ≥20 minutes, use a wet scrubbing sponge to wipe it smooth twice to achieve flat seam construction.

[0049] The construction method of the double-tube environmentally friendly epoxy colored sand of the present invention is further optimized as follows:

[0050] In case of mosaic and other small brick joint construction, use a special glue gun for caulking agent to automatically mix component A and component B. After the material is applied, use the corresponding special spatula to scrape it into the gap. Then wipe off the residue outside the gap with water to complete the construction.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] (1) The double-tube environmentally friendly epoxy colored sand of the present invention uses a special glue gun to mix the two tubes in a 1:1 ratio, which is automatically mixed and mixed evenly, reducing the influence of uneven mixing caused by human factors; at the same time, it can easily achieve a small amount of multiple mixing method, extending the operating time of the material.

[0053] (2) The combination of hydrophilic solvent-free epoxy resin and modified polyamide curing agent is water-scrubbable and can be applied by scraping or gluing. It can adapt to the high-efficiency filling of tile gaps in different areas.

[0054] (3) The high-performance hollow glass microspheres are used to adjust the density balance of components A and B, which has a high ratio tolerance and a large construction area.

[0055] (4) The double-tube environmentally friendly epoxy colored sand of the present invention has a distinct frosted texture, enriching the decorative effect of the double-tube seam beautifying agent, and has a variety of colors that can be adjusted. DETAILED DESCRIPTION

[0056] In order to make the application, technical scheme and advantages of the present invention more clear, the present invention is described in detail in conjunction with specific embodiments. It should be understood that the embodiments are only used to illustrate the present invention, but not to limit the protection scope of the present invention. All simple improvements to the preparation method of the present invention under the premise of the concept of the present invention belong to the protection scope of the present invention.

[0057] Example 1

[0058] A method for preparing double-tube environmentally friendly epoxy colored sand comprises the following preparation steps:

[0059] It comprises the following preparation steps:

[0060] S1. Preparation of component A: Add hydrophilic solvent-free epoxy resin, pigment, hydrophilic fumed silica and hydrophobic fumed silica to a disperser in proportion for pre-dispersion, then add part of filler and high-performance hollow glass microspheres for dispersion, then adjust the color, continue to add the remaining part of high-performance hollow glass microspheres and the remaining part of filler, stir at a predetermined dispersion rate, disperse by vacuum, and fill into the tube of component A of the seam beautifier using a special filling machine;

[0061] S2. Preparation of component B: Add the modified polyamide curing agent, hydrophilic fumed silica and pigment into a disperser in proportion for sufficient pre-dispersion, then add part of the filler and part of the high-performance hollow glass microspheres for dispersion, then adjust the color, then add the remaining part of the high-performance hollow microspheres, the remaining part of the filler and the modified thixotropic agent, stir at a predetermined dispersion rate, disperse by vacuum, and fill into the tube of component B of the seam beautifier using a special filling machine.

[0062] The predetermined dispersion rate is 500-1000 rpm, and the wall scraping rate is 20-50 rpm.

[0063] The hydrophilic solvent-free epoxy resin is a 100% solid hydrophilic solvent-free epoxy resin containing a polyether structure or an amino-terminated polyether structure in its molecular structure.

[0064] The filler is transparent glass micro beads or colored glass micro beads with a size of 25 to 110 microns.

[0065] The pigment is titanium dioxide

[0066] The preparation methods of Examples 2 to 5 are the same as those of Example 1, except that some raw materials and amounts are different, as shown in Table 1.

[0067] Comparative Examples 1 to 5:

[0068] The preparation method of Comparative Example 1 is the same as that of Example 1, with the main difference being that an oily epoxy resin is used in Comparative Example 1 to replace the hydrophilic solvent-free epoxy resin in the formula of Example 1.

[0069] The preparation methods of Comparative Example 2 and Example 1 are basically the same, with the main difference being that the pre-dispersion step of the gas silicon in the preparation method of Comparative Example 2 is different from that of Example 1, and the gas silicon is dispersed after the filler is added in Comparative Example 2.

[0070] The preparation method of Comparative Example 3 is the same as that of Example 1, with the main difference being that in Comparative Example 3, an epoxy emulsion with a solid content of 45% is used to replace the hydrophilic solvent-free epoxy resin in the component a formula of Example 5, and component B of Example 1 is used in combination.

[0071] The preparation method of Comparative Example 4 is the same as that of Example 1, with the main difference being that hydrophobic fumed silica is used in Comparative Example 4 to replace the hydrophilic fumed silica in the B component formula of Example 1.

[0072] The preparation method of Comparative Example 5 is the same as that of Example 1, except that ordinary hollow microspheres (true density 0.6 g / cm 3 ) replaces the high performance hollow glass microspheres in the formulation of Example 1.

[0073] The preparation method of Comparative Example 6 is the same as that of Example 1, except that ordinary hollow microspheres (true density 0.6 g / cm 3 ) replace the high-performance hollow glass microspheres in the formulation of Example 1, and change the ordinary hollow microspheres (true density 0.6 g / cm 3 ) dosage.

[0074] The preparation method of Comparative Example 7 is the same as that of Example 1, with the main difference being that the thixotropic agent used in Comparative Example 7 is a conventional thixotropic agent for seam beautifying agents found on the market.

[0075] Table 1 Specific raw material composition table of each embodiment (weight parts)

[0076]

[0077]

[0078] The embodiments and comparative examples were subjected to performance tests, and the results of the performance tests are shown in Table 2.

[0079]

[0080] Examples 1, 2, 3, and 5 all have good glue feel. Example 4 shows that even when more than 40% of filler is added, a relatively good glue feel can still be obtained.

[0081] Compared with Example 1, the oily epoxy resin used in Comparative Example 1 basically does not have the property of being washable with water, that is, it cannot be wiped with clean water for construction, and can only be constructed by means of gluing and scraping.

[0082] Compared with Example 1, the process of Comparative Example 2 is changed. In Comparative Example 2, the fumed silica is not fully dispersed in advance, but the filler is added first. This process may cause the material to be falsely thick and falsely thixotropic, affecting the compactness of the product and resulting in poor long-term durability.

[0083] Compared with Example 1, Comparative Example 3 uses an aqueous epoxy emulsion, and the solid content of the emulsion is usually between 40% and 50%. Such an emulsion can usually obtain better water washability and glue feel, but will seriously damage the stain resistance; in addition, the residual glue on the surface of the tile is difficult to clean, and the construction method of glue shoveling is usually not possible.

[0084] Compared with Example 1, Comparative Example 4 uses hydrophobic gas silica, which reduces the affinity of the material to water, resulting in a decrease in the overall hydrophilicity of the material, which may cause sponge tools to adhere and residues to remain on the surface of the tile.

[0085] Compared with Example 1, Comparative Examples 5 and 6 use hollow glass microspheres with high true density. Such microspheres are not as efficient as low true density hollow glass microspheres in adjusting the density balance of components A and B and reducing the density. In addition, adding a large amount of such hollow glass microspheres may lead to poor system compactness, thereby affecting stain resistance and glossiness.

[0086] Compared with Example 1, Comparative Example 7 uses a traditional double-tube thixotropic agent for seam beautification. This thixotropic agent has insufficient contribution and support to the thixotropy of the high sand content system. Under the same initial non-sagging condition, the glue application feel of Comparative Example 7 will be much heavier, and the durability is also insufficient.

[0087] To sum up, the above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0088] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0089] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

[0090] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0091] Unless otherwise indicated, percentages and parts are by weight.

[0092] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0093] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A double-tube environmentally friendly epoxy colored sand, characterized by: It includes component A and component B, and the volume ratio thereof is 1:1; The A component comprises the following raw material components in parts by weight: 50-90 parts of hydrophilic solvent-free epoxy resin, 10-30 parts of filler, 0-8 parts of pigment, 1-5 parts of high-performance hollow glass microspheres, 1-5 parts of hydrophilic fumed silica, and 1-5 parts of hydrophobic fumed silica; The B component comprises the following raw material components in parts by weight: 40-80 parts of modified polyamide curing agent, 5-45 parts of filler, 1-5 parts of high-performance hollow glass microspheres, 1-5 parts of hydrophilic fumed silica, 0-20 parts of pigment, 0.2-1 parts of modified thixotropic agent; The high-performance hollow glass microspheres are hollow glass microspheres with a particle size of 25 to 75 microns and a true density of 0.15 to 0.3 g / cm 3 , compressive strength ≥20Mpa; The modified polyamide curing agent comprises the following components in parts by weight: 10-20 parts of polyetheramine, 10-20 parts of low viscosity HMDA, 20-30 parts of amidoamine, 20-30 parts of high boiling point diluent, 10-20 parts of epoxy resin; The modified thixotropic agent comprises the following components in parts by weight: 30-40 parts of C18-unsaturated fatty acid, 25-35 parts of polyalkylene amine, 10-20 parts of epoxy resin, and 10-20 parts of high boiling point diluent; The molar ratio of C18-unsaturated fatty acid to polyalkyleneamine is 1:

1.

2. The double-tube environmentally friendly epoxy colored sand according to claim 1 is characterized in that: The filler is transparent glass micro beads or colored glass micro beads with a size of 25 to 110 microns.

3. The double-tube environmentally friendly epoxy colored sand according to claim 1 is characterized in that: The hydrophilic solvent-free epoxy resin is a 100% solid hydrophilic solvent-free epoxy resin containing a polyether structure or an amino-terminated polyether structure in its molecular structure.

4. The double-tube environmentally friendly epoxy colored sand according to claim 1 is characterized in that: The pigment is titanium dioxide, pearl powder, glitter powder or color paste.

5. The method for preparing double-tube environmentally friendly epoxy colored sand according to claim 1, characterized in that: It comprises the following preparation steps: S1. Preparation of component A: Add hydrophilic solvent-free epoxy resin, pigment, hydrophilic fumed silica and hydrophobic fumed silica to a disperser in proportion for pre-dispersion, then add part of filler and high-performance hollow glass microspheres for dispersion, then adjust the color, continue to add the remaining part of high-performance hollow glass microspheres and the remaining part of filler, stir at a predetermined dispersion rate, disperse by vacuum, and fill into the tube of component A of the seam beautifier using a special filling machine; S2. Preparation of component B: Add the modified polyamide curing agent, hydrophilic fumed silica and pigment into a disperser in proportion for sufficient pre-dispersion, then add part of the filler and part of the high-performance hollow glass microspheres for dispersion, then adjust the color, then add the remaining part of the high-performance hollow microspheres, the remaining part of the filler and the modified thixotropic agent, stir at a predetermined dispersion rate, disperse by vacuum, and fill into the tube of component B of the seam beautifier using a special filling machine.

6. The method for preparing double-tube environmentally friendly epoxy colored sand according to claim 5, characterized in that: The predetermined dispersion rate is 500-1000 rpm, and the wall scraping rate is 20-50 rpm.

7. The method for preparing double-tube environmentally friendly epoxy colored sand according to claim 5, characterized in that: The modified polyamide curing agent comprises the following preparation steps: s1. First, polyetheramine, low-viscosity HMDA and 50% of a high-boiling-point diluent are thoroughly mixed and heated to 60°C, which is recorded as mixed sample 1. s2. Mix the epoxy resin and 50% of the high boiling point diluent thoroughly and heat to 60°C, which is recorded as mixed sample 2. s3. The mixed sample 2 was slowly added dropwise to the mixed sample 1 at a constant temperature of 60 ° C. After the addition, the temperature was kept for 30 minutes, and the temperature was raised to 80 ° C and continued to be maintained for 30 minutes; s4. After the temperature drops naturally, the amidoamine is slowly added, mixed thoroughly, and maintained at 60° C. for 30 minutes to prepare the modified polyamide curing agent.

8. The method for preparing double-tube environmentally friendly epoxy colored sand according to claim 5, characterized in that: The modified thixotropic agent comprises the following preparation steps: s1. C18-unsaturated fatty acid and polyalkyleneamine are placed in a reaction vessel in a molar ratio of 1:1, and the reaction vessel is filled with nitrogen for protection, and maintained at 150-200° C. for 1 h-2 h to remove moisture from the raw materials; then the temperature is increased to 250-300° C., a condensation reaction is carried out under normal pressure, and the reaction is naturally cooled to about 95-100° C. to obtain solution 1; s2. Epoxy resin and high boiling point diluent are mixed evenly in a container and the temperature is raised to about 95-100°C as solvent 2; s3. In the temperature range of 95 to 100°C and the rotation speed of 700 to 800 rpm, the solvent 2 is slowly added dropwise to the solution 1. After the addition is completed, the temperature is raised to 150°C and reacted for half an hour to prepare the modified polyamide thixotropic agent.

9. A construction method of double-tube environmentally friendly epoxy colored sand according to claim 1, characterized in that: Use a special glue gun for caulking agent to automatically mix component A and component B, which can be directly injected into the gap for pressurization construction; or Use a special glue gun for caulking agent to automatically mix component A and component B, then use a special caulking scraper or rubber spatula to compact the material into the gap and scrape off excess material; after the gap has been filled for ≥20 minutes, use a wet scrubbing sponge to wipe it smooth twice to achieve flat seam construction.

10. The construction method of double-tube environmentally friendly epoxy colored sand according to claim 9, characterized in that: In case of mosaic and other small brick joint construction, use a special glue gun for caulking agent to automatically mix component A and component B. After the material is applied, use the corresponding special spatula to scrape it into the gap. Then wipe off the residue outside the gap with water to complete the construction.

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