Lightweight two-component vitrified tile back adhesive, preparation method and application thereof

Abstract

The application provides a light-weight two-component vitrified tile back adhesive as well as a preparation method and application thereof, and belongs to the technical field of tile back adhesive. The light-weight two-component vitrified tile back adhesive comprises a liquid material component and a powder material component; the powder material component comprises cementitious material, light-weight aggregate, cellulose ether, early strength agent, and optionally water reducing agent; the liquid material component comprises polymer emulsion, water, and functional auxiliary agent; wherein the bulk density of the light-weight aggregate is 200-1000 kg / m 3 ; the polymer emulsion is selected from any one or a combination of two of acrylic emulsion or styrene-butadiene emulsion. The application replaces natural river sand or machine-made sand with light-weight aggregate, and the prepared back adhesive has a significantly reduced wet density, which can increase the roller dipping amount, increase the one-time coating thickness of the back adhesive, and significantly reduce the hollowing and tile falling phenomena caused by insufficient coating thickness of the back adhesive.

Description

Technical Field

[0001] This invention belongs to the field of brick backing adhesive technology, and particularly relates to a lightweight two-component vitrified brick backing adhesive, its preparation method and application. Background Technology

[0002] Tiles have a long history of use in the construction industry, and a large number are still used annually. Common applications include walls and floors in kitchens, bathrooms, balconies, and hallways. With advancements in tile technology, tiles have evolved from high-absorption to low-absorption types, and their sizes have expanded from small (e.g., 300mm x 600mm) to larger sizes (e.g., 800mm x 800mm, 750mm x 1500mm). The low water absorption and large size of vitrified tiles significantly increase the difficulty and cost of installation. To reduce costs and increase installation reliability, a common practice is to use a combination of low-grade tile adhesive (e.g., C0, C1) and a two-component backing adhesive. This involves first applying a layer of two-component vitrified tile adhesive to the back of the tile, allowing it to dry, and then applying the tile adhesive. This method significantly reduces raw material costs while increasing installation reliability and minimizing the risk of tiles becoming hollow or detaching.

[0003] Two-component vitrified tile adhesive has specific requirements for application thickness, generally recommended to be around 1mm, with a minimum thickness of 0.5mm. However, during application, most installers only apply the adhesive to each tile once with a roller. Due to the high density of existing two-component adhesives, the amount applied with a single roller application is insufficient, resulting in a generally thin coating thickness for two-component vitrified tile adhesive, sometimes only 0.3mm or even less. This has led to numerous projects experiencing hollow spots and tile detachment several months after installation. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a lightweight two-component vitrified tile backing adhesive, its preparation method, and its application, aiming to at least partially solve the above-mentioned technical problems. The technical solution provided by this invention is as follows.

[0005] As a first aspect of the present invention, a lightweight two-component vitrified brick backing adhesive is provided, comprising a liquid component and a powder component; the powder component includes: cementitious materials, lightweight aggregates, cellulose ethers, an early-strength agent, and optionally a water-reducing agent; the liquid component includes: a polymer emulsion, water, and functional additives; wherein the bulk density of the lightweight aggregates is 200-1000 kg / m³. 3 The polymer emulsion is selected from any one or a combination of two of acrylic emulsions or styrene-butadiene emulsions.

[0006] As a second aspect of the present invention, a method for preparing a lightweight two-component vitrified brick backing adhesive is provided, comprising: mixing a polymer emulsion, a functional additive and water to obtain a liquid component; and mixing a cementitious material, lightweight aggregate, cellulose ether and an early strength agent to obtain a powder component.

[0007] As a third aspect of the present invention, a lightweight two-component vitrified tile adhesive is provided for the application of bonding ceramic tiles and vitrified tiles.

[0008] In this invention, by using lightweight aggregates to replace natural river sand or manufactured sand, the wet density of the lightweight two-component vitrified tile adhesive is significantly reduced, which can increase the amount of material dipped by the roller in one go and increase the coating thickness in one go. This significantly reduces the phenomenon of hollowing and tile falling off caused by insufficient adhesive coating thickness. Furthermore, under the condition of ensuring the same thickness of lightweight two-component vitrified tile adhesive coating, the number of dips is significantly reduced, reducing the labor intensity of construction workers and improving the adhesive coating efficiency. Detailed Implementation

[0009] The embodiments of the present invention will now be described. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the invention.

[0010] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0011] In the process of realizing the concept of this invention, it was found that construction workers often only dip the adhesive once to apply it to the entire tile, which makes the coating thickness of the two-component vitrified tile adhesive generally too thin, failing to meet the construction thickness requirements, resulting in hollowing and tile falling off.

[0012] Based on the above-mentioned problems, as a first aspect of the present invention, the present invention provides a lightweight two-component vitrified brick backing adhesive, comprising a liquid component and a powder component; the powder component includes: cementitious materials, lightweight aggregates, cellulose ethers, an early-strength agent, and optionally a water-reducing agent; the liquid component includes: a polymer emulsion, water, and functional additives; wherein the bulk density of the lightweight aggregates is 200-1000 kg / m³. 3 The polymer emulsion is selected from any one or a combination of two of acrylic emulsions or styrene-butadiene emulsions.

[0013] In this invention, the powder component uses lightweight aggregate instead of traditional river sand or manufactured sand, combined with cement as an inorganic binder, and cellulose ether, early-strength agents, etc., to create a powder component with lower density, thereby reducing the wet density of the two-component vitrified tile adhesive by 30-50%. The lower density adhesive allows for a larger amount of material applied per roller stroke, increasing the coating thickness and significantly improving bonding strength. This reduces issues like hollow areas and tile detachment caused by insufficient adhesive thickness. Furthermore, while maintaining the same thickness of lightweight two-component vitrified tile adhesive, it reduces the number of strokes, decreasing the workload for construction workers and improving application efficiency. Additionally, a liquid component is prepared using polymer emulsion, water, and functional additives to enhance the adhesion between the two-component vitrified tile and the ceramic tile, making it less prone to detachment during use. Through the combined action of the liquid and powder components, the prepared lightweight two-component vitrified tile adhesive exhibits lower density, higher bonding strength, and a smoother, more even application during construction, while remaining less prone to detachment. In addition, because the required coating thickness is achieved, the bonding strength of vitrified tiles after thermal aging can be improved, significantly reducing the phenomenon of tile hollowing and falling off due to thermal expansion and contraction under high temperature (35-50℃) conditions; it can also effectively improve the bonding strength of vitrified tiles after freeze-thaw cycles, significantly reducing the phenomenon of tile hollowing and falling off due to humidity and freezing in cold regions.

[0014] According to embodiments of the present invention, the strength of the cementitious material affects the rigid support of the adhesive backing of lightweight two-component vitrified bricks, thereby affecting long-term bonding stability and load-bearing capacity. The cementitious material of the present invention has a strength of 42.5 MPa and above. Within this range, the strength of the cementitious material can match the flexibility of the polymer emulsion, enhancing adhesion through mechanical interlocking while simultaneously buffering stress through the flexibility of the polymer emulsion, ensuring long-term bonding stability. Further, the cementitious material is silicate cement, and more specifically, P·O 42.5 ordinary silicate cement.

[0015] According to embodiments of the present invention, the lightweight aggregate is selected from any one or a combination of two of vitrified microspheres and lightweight sand, wherein the vitrified microspheres are hollow closed-cell spheres with low density, low water absorption, and thermal insulation properties. The vitrified microspheres used in this invention have a particle size of 40-140 mesh, are continuously distributed, and have a bulk density of 200-500 kg / m³. 3 The compressive strength is ≥500 kPa, and the surface vitrification closed-cell rate is ≥80%. In the lightweight two-component vitrified brick backing adhesive, the low slurry absorption and easy dispersion of vitrified microspheres are utilized to limit their bulk density to 200-500 kg / m³. 3 It can meet the requirements of low density and light weight without floating in the slurry due to excessively low density, which would lead to uneven dispersion and affect the adhesive performance of the vitrified tile backing.

[0016] In some embodiments, the vitrified microspheres have a particle size of 40-140 mesh, for example, 40 mesh, 60 mesh, 80 mesh, 100 mesh, 120 mesh, 140 mesh, or a mixture thereof. The bulk density of the vitrified microspheres is 200-500 kg / m³. 3 For example, it can be 200kg / m 3 300kg / m 3 400kg / m 3 500kg / m 3 The barrel compressive strength of the vitrified microspheres is ≥500 kPa, for example, 500 kPa, 700 kPa, 1000 kPa, 1200 kPa, or 1500 kPa. The surface vitrification closed-cell rate of the vitrified microspheres is ≥80%, for example, 80%, 90%, or 100%.

[0017] According to an embodiment of the present invention, lightweight sand is a lightweight, irregularly shaped particle with high strength, rough surface, and good adhesion to cementitious systems. It meets the requirements for lightweight aggregates and also improves the bonding strength and anti-slip properties of vitrified tile backing adhesive. The lightweight sand used in this invention has a particle size of 40-140 mesh, is continuously distributed, and has a bulk density of 500-1000 kg / m³. 3 .

[0018] In some embodiments, the particle size of the lightweight sand is 40-140 mesh, for example, 40 mesh, 60 mesh, 80 mesh, 100 mesh, 120 mesh, 140 mesh, or a mixture thereof. The bulk density of the lightweight sand is 500-1000 kg / m³. 3 For example, it can be 500 kg / m 3 700kg / m 3 800kg / m 3 1000kg / m 3 .

[0019] According to embodiments of the present invention, the cellulose ether is selected from at least one of hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether, and can regulate the rheological properties, water retention, and anti-slip properties of the slurry. Hydroxypropyl methyl cellulose ether has excellent water retention, thixotropy, and good compatibility with cementitious gel materials, while hydroxyethyl methyl cellulose ether has a lower cost and can be flexibly adjusted or compounded according to actual needs during use.

[0020] According to embodiments of the present invention, the viscosity of the cellulose ether is 30,000-60,000 mPa·s, for example, 30,000 mPa·s, 40,000 mPa·s, 50,000 mPa·s, or 60,000 mPa·s. The viscosity of the cellulose ether can affect the rheological properties of the lightweight two-component vitrified tile adhesive, thereby affecting the smoothness of application and the anti-slip properties. Within this range, the lightweight two-component vitrified tile adhesive can be applied evenly and has good thixotropic properties, making it less prone to blistering.

[0021] According to an embodiment of the present invention, the early strength agent is a calcium salt early strength agent, such as calcium formate.

[0022] According to an embodiment of the present invention, the water-reducing agent is a polycarboxylate water-reducing agent, such as PC1021.

[0023] According to embodiments of the present invention, the polymer emulsion is selected from any one or a combination of two of acrylic emulsions and styrene-butadiene emulsions. During use, the proportion of a single acrylic emulsion in the blend is 0-100%, for example, 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, etc. Blending acrylic emulsions with styrene-butadiene emulsions can overcome the shortcomings of single emulsions in terms of bonding strength, flexibility, water resistance, and construction compatibility, forming a rigid-flexible, stable, and reliable bonding system.

[0024] In some embodiments, the acrylic emulsion is selected from pure acrylic emulsion or styrene-acrylic emulsion, and its glass transition temperature (T) is... g The temperature range is 5-20℃, preferably ENCOR 5525CS, RS-2608 or RS-300L.

[0025] In some embodiments, the glass transition temperature (T) of the styrene-butadiene emulsion is... g The optimal temperature range is 5-20℃, with Trinseo3618 being the preferred choice.

[0026] According to embodiments of the present invention, the functional additives in the powder components include dispersants, defoamers, bactericides, and fungicides.

[0027] According to an embodiment of the present invention, the dispersant used in the present invention is a high-performance comb polymer, such as Coadis BR 85.

[0028] According to embodiments of the present invention, the defoamer is selected from silicone defoamers or polyether defoamers, such as SN-DEFOAMER 1370 or RHODOLINE DF1102.

[0029] According to embodiments of the present invention, the antifungal agent is selected from isothiazolinone antifungal agents or bromonitol antifungal agents, such as ZOE 2X.

[0030] According to embodiments of the present invention, the bactericide is selected from isothiazolinone bactericides or quaternary ammonium salt bactericides, such as MBS or Kathon LXE.

[0031] According to an embodiment of the present invention, the powder components, by total weight, include: 50%-69% cementitious materials, 30%-50% lightweight aggregates, 0.1%-0.35% cellulose ethers, 0.3%-1% early strength agent, and 0-0.2% water-reducing agent.

[0032] According to an embodiment of the present invention, the liquid components, by total weight, include: 45%-60% polymer emulsion, 35%-54% water, 0.1%-0.5% dispersant, 0.1%-0.5% defoamer, 0.05%-0.2% mildew inhibitor, and 0.2%-0.5% bactericide.

[0033] According to embodiments of the present invention, the lightweight aggregate in the present invention has a low bulk density (200-1000 kg / m³). 3 Therefore, only a smaller amount (30%-50%) of the same technology is needed to meet product quality requirements.

[0034] According to embodiments of the present invention, the liquid component and the powder component are mixed in a weight ratio of 1:1.5-2, for example, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, or 1:2. The mixing ratio of the liquid component to the powder component is a core parameter determining the workability, bonding strength, durability, and stability, thus affecting the final bonding effect and project quality. This invention limits the ratio of the liquid component to the powder component in the lightweight two-component vitrified tile adhesive to 1:1.5-2, enabling the liquid component to completely encapsulate the powder particles, forming a continuous and dense adhesive film. This results in a paste-like slurry with moderate fluidity, non-sagging, easy application, and a uniform thickness after coating.

[0035] As a second aspect of the present invention, a method for preparing the above-mentioned lightweight two-component vitrified brick backing adhesive is provided, comprising: mixing a polymer emulsion, a functional additive and water to obtain a liquid component; and mixing a cementitious material, lightweight aggregate, cellulose ether and an early strength agent to obtain a powder component.

[0036] In some specific embodiments, styrene-butadiene latex, acrylic emulsion, dispersant, defoamer, bactericide, mildew inhibitor and water are mixed to obtain liquid components.

[0037] According to an embodiment of the present invention, the preparation method of the above-mentioned lightweight two-component vitrified tile backing adhesive further includes: mixing the liquid component and the powder component at a weight ratio of 1:1.5-2 during use. During the preparation process, the liquid component and the powder component need to be thoroughly and uniformly mixed to maintain high stability and adhesion. Using high-strength vitrified microspheres and lightweight sand as single or compound admixtures as lightweight aggregates can also avoid breakage due to insufficient aggregate strength during mixing.

[0038] As a third aspect of the present invention, an application of the above-mentioned lightweight two-component vitrified tile adhesive in bonding ceramic tiles and vitrified tiles is provided.

[0039] In this invention, the lightweight two-component vitrified tile adhesive has a low density. When using a roller to apply the same amount of vitrified tile adhesive, the lightweight two-component vitrified tile adhesive of this invention can be applied in a larger quantity and with a thicker coating, thus achieving higher bonding strength and avoiding problems such as hollowing and tile falling off.

[0040] The present invention will now be described in further detail with reference to specific embodiments. The given embodiments are merely illustrative of the invention and not intended to limit its scope. The embodiments provided below can serve as a guide for further improvements by those skilled in the art and do not constitute a limitation on the invention in any way.

[0041] In the following examples, the acrylic emulsions include ENCOR 5525CS from Arkema, and RS-2608 and RS-300L from Badaf, which are interchangeable and not blended. The polymer emulsion is a blend of acrylic emulsion and styrene-butadiene emulsion.

[0042] The styrene-butadiene emulsion Trinseo 3618 was supplied by Shengxi'ao Company.

[0043] The dispersant Coadis BR 85 was supplied by Arkema.

[0044] The defoamer SN-DEFOAMER 1370 was supplied by Sanopco.

[0045] The antifungal agent ZOE-2X was provided by Lonza.

[0046] The bactericide MBS was supplied by Tor.

[0047] The cementitious material is ordinary Portland cement P·O 42.5, provided by Conch Cement Corporation.

[0048] The natural sand was provided by Lushan Huasha Mortar Co., Ltd., with a particle size of 40-140 mesh.

[0049] The particle size of manufactured sand is 40-140 mesh.

[0050] The vitrified microspheres have a particle size of 40-140 mesh.

[0051] Lightweight sand has a particle size of 40-140 mesh.

[0052] The cellulose ether was provided by Shanghai Huiguang Company, and the viscosity of hydroxypropyl methylcellulose ether was 55000 mPa·s.

[0053] The water-reducing agent PC1021 was supplied by Suzhou Xingbang Company.

[0054] The early-strength agent is calcium formate, supplied by Jiangxi Keding Company.

[0055] Currently, the aggregates commonly available on the market are all conventional natural river sand or manufactured sand. The following are three formulas of conventional commercial products (Comparative Examples 1-3) for comparison.

[0056] Comparative Example 1

[0057] The specific weight (kg) ratios of the liquid and powder components are shown in Table 1, where the weight ratio of the liquid to the powder components is 1:2.

[0058] Table 1

[0059]

[0060] Comparative Example 2

[0061] The specific weight (kg) ratios of the liquid and powder components are shown in Table 2, where the weight ratio of the liquid to the powder components is 1:2.

[0062] Table 2

[0063]

[0064] Comparative Example 3

[0065] The specific weight (kg) ratios of the liquid and powder components are shown in Table 3, where the weight ratio of the liquid to the powder components is 1:1.8.

[0066] Table 3

[0067]

[0068] Example 1

[0069] The specific weight (kg) ratios of the liquid and powder components are shown in Table 4, where the weight ratio of the liquid to the powder components is 1:1.5.

[0070] Table 4

[0071]

[0072] Example 2

[0073] The specific weight (kg) ratios of the liquid and powder components are shown in Table 5, where the weight ratio of the liquid to the powder components is 1:1.5.

[0074] Table 5

[0075]

[0076] Example 3

[0077] The specific weight (kg) ratios of the liquid and powder components are shown in Table 6, where the weight ratio of the liquid to the powder components is 1:1.5.

[0078] Table 6

[0079]

[0080] Example 4

[0081] The specific weight (kg) ratios of the liquid and powder components are shown in Table 7, where the weight ratio of the liquid to the powder components is 1:1.8.

[0082] Table 7

[0083]

[0084] Example 5

[0085] The specific weight (kg) ratios of the liquid and powder components are shown in Table 8, where the weight ratio of the liquid to the powder components is 1:2.

[0086] Table 8

[0087]

[0088] Example 6

[0089] The specific weight (kg) ratios of the liquid and powder components are shown in Table 9, where the weight ratio of the liquid to the powder components is 1:1.5.

[0090] Table 9

[0091]

[0092] Example 7

[0093] The specific weight (kg) ratios of the liquid and powder components are shown in Table 10, where the weight ratio of the liquid to the powder components is 1:1.5.

[0094] Table 10

[0095]

[0096] Example 8

[0097] The specific weight (kg) ratios of the liquid and powder components are shown in Table 11, where the weight ratio of the liquid to the powder components is 1:2.

[0098] Table 11

[0099]

[0100] Example 9

[0101] The specific weight (kg) ratios of the liquid and powder components are shown in Table 12, where the weight ratio of the liquid to the powder components is 1:1.8.

[0102] Table 12

[0103]

[0104] Example 10

[0105] The specific weight (kg) ratios of the liquid and powder components are shown in Table 13, where the weight ratio of the liquid to the powder components is 1:1.8.

[0106] Table 13

[0107]

[0108] Example 11

[0109] The specific weight (kg) ratios of the liquid and powder components are shown in Table 14, where the weight ratio of the liquid to the powder components is 1:1.8.

[0110] Table 14

[0111]

[0112] Example 12

[0113] The specific weight (kg) ratios of the liquid and powder components are shown in Table 15, where the weight ratio of the liquid to the powder components is 1:1.8.

[0114] Table 15

[0115]

[0116] Example 13

[0117] The specific weight (kg) ratios of the liquid and powder components are shown in Table 16, where the weight ratio of the liquid to the powder components is 1:1.8.

[0118] Table 16

[0119]

[0120] Example 14

[0121] The specific weight (kg) ratios of the liquid and powder components are shown in Table 17, where the weight ratio of the liquid to the powder components is 1:1.8.

[0122] Table 17

[0123]

[0124] The lightweight two-component vitrified tile adhesives used in Comparative Examples 1-3 and Examples 1-14 were tested. The wet density test method adopted Method B of the fresh mortar density test method in GB / T 29756-2013 standard; the bond strength test adopted the test method for cement-based tile adhesives in JC / T 547-2017 standard. Before the bond strength test, the vitrified tile adhesives mentioned in the comparative examples and examples were pre-applied to standard tiles. After the adhesive was fully cured, the tiles were laid, and the sample preparation, curing, and testing were carried out according to the corresponding methods in JC / T547-2017 standard. The tile adhesive used in this test example was C1 grade tile adhesive. Specific test results are shown in Tables 18-19.

[0125] Table 18. Physical Performance Tests

[0126]

[0127] Table 19. Physical Performance Tests

[0128]

[0129] The wet density test results of Examples 1-14 and Comparative Examples 1-3 show that after replacing natural river sand or manufactured sand with lightweight aggregate, the wet density of the vitrified tile adhesive decreased significantly, with a reduction of 30-50%. The bond strength test results revealed that, compared to the control group, the lightweight vitrified tile adhesive did not show a decrease in performance under standard tile conditions, water immersion treatment, heat aging, and freeze-thaw cycles. Furthermore, the tensile bond strength after heat aging and freeze-thaw cycles was significantly improved. Compared to existing conventional two-component vitrified tile adhesives, the lightweight two-component adhesive of this invention not only significantly reduces the wet density of the adhesive but also improves the tensile bond strength after heat aging and freeze-thaw cycles, thus increasing the safety of tile installation.

[0130] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight two-component vitrified tile backing adhesive, characterized in that, Includes liquid components and powder components; The powder components include: cementitious materials, lightweight aggregates, cellulose ethers, early strength agents, and optional water-reducing agents; The liquid components include: polymer emulsion, water, and functional additives; The bulk density of the lightweight aggregate is 200-1000 kg / m³. 3 The polymer emulsion is selected from any one or a combination of two of acrylic emulsions and styrene-butadiene emulsions.

2. The lightweight two-component vitrified tile backing adhesive according to claim 1, characterized in that: The functional additives include dispersants, defoamers, bactericides, and fungicides; Based on the total weight of the powder components, the powder components include the following components: 50%-69% cementitious materials, 30%-50% lightweight aggregates, 0.1%-0.35% cellulose ethers, 0.3%-1% early strength agent, and 0-0.2% water-reducing agent; Based on the total weight of the liquid components, the liquid components include the following components: 45%-60% polymer emulsion, 35%-54% water, 0.1%-0.5% dispersant, 0.1%-0.5% defoamer, 0.05%-0.2% mildew inhibitor, 0.2%-0.5% bactericide.

3. The lightweight two-component vitrified tile backing adhesive according to claim 1 or 2, characterized in that: The liquid component and the powder component are mixed at a weight ratio of 1:1.5-2.

4. The lightweight two-component vitrified tile backing adhesive according to claim 1, characterized in that: The polymer emulsion has a glass transition temperature of 5-20℃, the cellulose ether has a viscosity of 30000-60000 mPa·s, and the cementitious material has a strength of 42.5 MPa or higher.

5. The lightweight two-component vitrified tile backing adhesive according to claim 1 or 4, characterized in that: When the acrylic emulsion and styrene-butadiene emulsion are compounded, the proportion of a single emulsion is 0-100%, wherein the acrylic emulsion is selected from pure acrylic emulsion or styrene-acrylic emulsion; The cellulose ether is selected from at least one of hydroxyethyl methyl cellulose ether or hydroxypropyl methyl cellulose ether; The cementitious material is silicate cement.

6. The lightweight two-component vitrified tile backing adhesive according to claim 1, characterized in that: The lightweight aggregate is selected from any one or a combination of two of vitrified microspheres or lightweight sand.

7. The lightweight two-component vitrified tile backing adhesive according to claim 6, characterized in that: The vitrified microspheres have a particle size of 40-140 mesh, are continuously distributed, and have a bulk density of 200-500 kg / m³. 3 The barrel compressive strength is ≥500 kPa, and the surface vitrification closed-cell rate is ≥80%. The lightweight sand has a particle size of 40-140 mesh, is continuously distributed, and has a bulk density of 500-1000 kg / m³. 3 .

8. The lightweight two-component vitrified tile backing adhesive according to claim 2, characterized in that: The defoamer is selected from silicone defoamers or polyether defoamers; The antifungal agent is selected from isothiazolinone antifungal agents or bromonitol antifungal agents; The bactericide is selected from isothiazolinone bactericides or quaternary ammonium salt bactericides; The water-reducing agent is a polycarboxylate water-reducing agent; The early strength agent is a calcium salt early strength agent.

9. A method for preparing a lightweight two-component vitrified tile backing adhesive as described in any one of claims 1-8, characterized in that: The polymer emulsion, functional additives, and water are mixed to obtain the liquid component; Cement binder, lightweight aggregate, cellulose ether, and early strength agent are mixed to obtain a powder component.

10. The application of a lightweight two-component vitrified tile adhesive as described in any one of claims 1-8 in bonding ceramic tiles and vitrified tiles.

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