Efficient moisturizing multifunctional additive for ceramic tile adhesive as well as preparation method and application of efficient moisturizing multifunctional additive

Abstract

The invention provides an efficient moisturizing multifunctional additive for a ceramic tile adhesive as well as a preparation method and application of the efficient moisturizing multifunctional additive, and belongs to the technical field of building materials. The efficient moisturizing multifunctional additive is prepared from the following components in parts by weight: 10 to 30 parts of modified peanut shell straw, 10 to 30 parts of calcium hydroxide, 5 to 20 parts of hydroxyethyl urea, 0 to 20 parts of propylene glycol, 0 to 20 parts of butanediol, 1 to 20 parts of zinc pyrrolidone carboxylate, 1 to 20 parts of trehalose and 1 to 10 parts of hyaluronic acid. The efficient moisturizing multifunctional additive can improve the cohesiveness and consistency of a ceramic tile adhesive, and has obvious effects on improving the water-retaining property of mortar and reducing shrinkage cracking hazards.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a high-efficiency moisturizing multifunctional additive for tile adhesive, a preparation method and application thereof. Background Art

[0002] Tile adhesive is an adhesive used for laying ceramic tiles, marble, granite and other building materials. It is mainly used for laying and repairing indoor and outdoor floors and walls. There are generally three types of tile adhesives, namely cement-based adhesive type C; paste emulsion-based adhesive type D; reactive resin adhesive type R. Cement-based tile adhesives can be divided into C0, C1, and C2 types according to product strength grades. In addition, there are some tile adhesives with special performance requirements, such as anti-slip-type T; flexible tile adhesives-type S1, S2; extended air-drying time-type E, etc. Therefore, there are many types of tile adhesives, and their preparation technology is very complex and strict.

[0003] At present, cement-based tile adhesive is the most widely used type of tile adhesive in the market. With the development of the construction industry and the increasing popularity of tile use, new products and technologies for tiles are also developing, especially the application and development of large brick systems and rock slab systems. The market demand for high-end tile adhesives is gradually increasing. Therefore, the research and production of high-quality tile adhesives has broad development prospects in the market. Traditional cement-based tile adhesives are generally only studied for bonding strength, and there is less research on the workability and other special properties of tile adhesives. It often happens that the tile adhesive product strength test is qualified, but quality accidents such as brick falling and hollowing occur later.

[0004] Therefore, there is an urgent need for a highly efficient, moisturizing, multifunctional additive for tile adhesives that can combine the performance of tile adhesives with construction technology and improve the quality of tile adhesives. Summary of the invention

[0005] The purpose of the present invention is to provide a high-efficiency moisturizing multifunctional additive for tile adhesive, a preparation method and application thereof. The high-efficiency moisturizing multifunctional additive can be added to cement-based tile adhesive to modify the cement-based tile adhesive so that the tile adhesive has excellent moisturizing effect and crack resistance, and improves the flexibility of the tile adhesive and good anti-slip properties.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A highly efficient moisturizing multifunctional additive for tile adhesive comprises the following components in parts by weight: 10-30 parts of modified peanut shell straw, 10-30 parts of calcium hydroxide, 5-20 parts of hydroxyethyl urea, 1-10 parts of EDTA4Na, 0-20 parts of propylene glycol, 0-20 parts of butylene glycol, 1-20 parts of zinc pyrrolidonecarboxylate, 1-20 parts of trehalose and 1-10 parts of hyaluronic acid.

[0008] Furthermore, the preparation method of the modified peanut shell straw comprises the following steps:

[0009] (1) compacting, crushing and grinding the peanut shells in sequence to obtain peanut shell straws of 1-2 mm;

[0010] (2) adding 10 parts by weight of peanut shell straw to 30-35 parts by weight of 60-80° C. acetone aqueous solution, and hot grinding at a speed of 300 rpm-400 rpm for 1-2 hours;

[0011] (3) cooling to 40-50° C., adding 40-46 parts by weight of a 52-55% sodium hydroxide aqueous solution, and immersing for 40-50 hours;

[0012] (4) Then, the mixture is neutralized with an aqueous solution of glacial acetic acid having a mass concentration of 58-60% to a pH value of 6.5-7.5, and finally, the mixture is centrifuged, separated, and dried to obtain the modified peanut shell straw.

[0013] Furthermore, the mass concentration of the acetone aqueous solution is 40-50%.

[0014] In order to achieve the effect of energy conservation and emission reduction, the recycling of agricultural waste is becoming more and more popular in the preparation of building materials. The present invention adds modified peanut shells to the efficient and moisturizing multifunctional additive, which can improve the bonding strength of the additive, and it is found in the test process that the use of peanut shells as raw materials is better than the use of traditional commonly used corn stalks, rice straws and wheat straws. Analysis is that the inside of the peanut shell contains rich cellulose and lignin, and its fiber structure is an interlaced network structure. The characteristic of this structure is that the fibers are not completely arranged in parallel, but are interwoven into a mesh, forming a porous and high surface area characteristic, giving the peanut shells higher mechanical strength and better water absorption, and the synergistic effect with the other components in the efficient and moisturizing multifunctional additive is better, which is more conducive to improving the bonding strength of tile adhesives. The fibers in the corn stalks, rice straws and wheat straws frequently used in the prior art are mainly arranged longitudinally, forming relatively regular and parallel fiber bundles, resulting in relatively low bonding strength.

[0015] The invention soaks peanut shells in acetone aqueous solution and NaOH aqueous solution in sequence, and after modification, the bonding strength of tile adhesive after immersion in water can be improved. Through the above treatment, grease, wax and other organic impurities on the surface of peanut shells can be effectively removed, and the peanut shell straw is subjected to alkalization treatment to remove part of hemicellulose and other non-cellulose components, exposing more cellulose, so that the peanut shell straw is modified to have the characteristics of cellulose, and then glacial acetic acid is used for neutralization, which neutralizes the excess NaOH solution on the one hand, and the alkali treatment also makes the hydroxyl group (-OH) of cellulose more active on the other hand, and the glacial acetic acid can cross-link with the alkalized peanut shell straw to partially generate etherified cellulose, and the modified peanut shell straw has better compatibility with other components and forms a denser structure, and the etherified cellulose can improve the bonding performance of the adhesive after water resistance.

[0016] Furthermore, the invention comprises the following components in parts by weight: 18-24 parts of modified peanut shell straw, 16-21 parts of calcium hydroxide, 8-14 parts of hydroxyethyl urea, 3-7 parts of EDTA4Na, 7-12 parts of propylene glycol, 3-8 parts of butylene glycol, 10-15 parts of zinc pyrrolidonecarboxylate, 7-13 parts of trehalose and 5-9 parts of hyaluronic acid.

[0017] Furthermore, the weight ratio of modified peanut shell straw, calcium hydroxide and EDTA4Na is (20-22):(18-20):(4-6).

[0018] In the present invention, while modifying the peanut shell, calcium hydroxide and EDTA4Na are added, and the anti-slip property of the tile adhesive additive can be further improved. This is mainly because EDTA4Na can form a stable complex with calcium ions, which can help improve the interface bonding between calcium hydroxide and peanut shell straw, so that calcium hydroxide can be more evenly distributed on the surface of the modified peanut shell straw, so that calcium hydroxide is evenly wrapped in the modified peanut shell straw, thereby avoiding uneven coagulation, forming a uniform overall structure, optimizing the microstructure of the tile adhesive, reducing the porosity, and making the interface bonding with the cement matrix stronger.

[0019] And when modified peanut shell straw, calcium hydroxide, and EDTA4Na are in a specific ratio, the water immersion strength of the adhesive can also be improved. The analysis shows that the three components can achieve the best synergistic effect under a specific ratio. The modified peanut shell straw provides mechanical strength, calcium hydroxide provides chemical stability, and EDTA4Na improves the interface bonding. The three work together to improve the water immersion strength of the adhesive. Once a certain component is excessive, it may interfere with the functions of other components in the system, thereby affecting the water resistance of the adhesive.

[0020] Furthermore, the weight ratio of hydroxyethyl urea: (propylene glycol + butylene glycol): zinc pyrrolidone carboxylate: (trehalose + hyaluronic acid) is (8-14): (12-17): (10-13): (13-16).

[0021] The addition of hydroxyethyl urea in the present invention can absorb moisture and increase the flexibility of the material; propylene glycol and butylene glycol are alcohol compounds with water absorption properties, which can be used as wetting aids in tile adhesives to maintain the wettability and early workability of mortar; zinc pyrrolidone carboxylate is an amino acid derivative, which has strong hygroscopicity and can absorb moisture from the air, and has stronger moisturizing ability than propylene glycol. Trehalose and hyaluronic acid are polysaccharide structures, and their own polysaccharide structures have a certain retarding effect in cement products. The alcohol groups in their polysaccharide structures can bind to water molecules in the cement hydration reaction and slowly release them in the later stage, so they also have a partial moisturizing effect. When the weight ratio of hydroxyethyl urea: (propylene glycol + butylene glycol): zinc pyrrolidone carboxylate: (trehalose + hyaluronic acid) is within a specific range, a synergistic effect between the components can be achieved, which helps to improve the stability of the adhesive in freeze-thaw cycles. The analysis shows that under this condition, the moisturizing effect of the adhesive can be better improved, and the moisture in the cement-based adhesive can be slowly released, thereby prolonging the hydration process of the cement. Moisturizing can slow down the evaporation of water and reduce the risk of cracking. This can ensure that the cement is fully hydrated, forming a denser crystalline structure and improving the bonding strength. In a cold environment, moisturizing can prevent moisture from freezing too quickly, reduce the internal pressure and structural damage caused by the formation of ice crystals, and help improve the stability of the material in freeze-thaw cycles.

[0022] In the present invention, modified peanut shell straw, calcium hydroxide and EDTA4Na are mixed as the main components of the auxiliary agent, which has good flexibility and water retention, while zinc pyrrolidone carboxylate and hydroxyethyl urea have lubricating and high moisturizing effects, and also have good workability for wet mortar. In addition, propylene glycol, butylene glycol, trehalose, hyaluronic acid and other alcohols, acids, sugar organic substances are added to coordinate with each other and work together, thereby achieving the effect of 1+1>2, so that the cement-based adhesive can maintain a certain plasticity and fluidity, and has higher workability and is convenient for construction operation, which is especially important for applications requiring a longer open time and adjustment time.

[0023] Furthermore, the invention comprises the following components in parts by weight: 20 parts of modified peanut shell straw, 20 parts of calcium hydroxide, 5 parts of EDTA4Na, 10 parts of hydroxyethyl urea, 10 parts of propylene glycol, 5 parts of butylene glycol, 11 parts of zinc pyrrolidonecarboxylate, 9 parts of trehalose and 5 parts of hyaluronic acid.

[0024] The second aspect of the present invention provides a method for preparing a highly efficient moisturizing multifunctional additive for tile adhesives, comprising the following steps: uniformly mixing modified peanut shell straw, calcium hydroxide and EDTA4 sodium, then adding the remaining components and mixing them uniformly to obtain a highly efficient moisturizing multifunctional additive for tile adhesives.

[0025] The third aspect of the present invention provides an application of a high-efficiency, moisturizing, multifunctional additive for tile adhesives.

[0026] Furthermore, the high-efficiency moisturizing multifunctional additive for tile adhesive is used in the preparation of ordinary cement-based adhesive, and the ordinary cement-based adhesive includes the following components in weight percentage: 30-40% cement, 0-5% redispersible latex powder, 0.3-0.5% cellulose ether, 0.5-1% high-efficiency moisturizing multifunctional additive, 0.8-1.2% nano silicon dioxide, 20-22% water, and the balance is sand.

[0027] Furthermore, the molecular weight of the cellulose ether is 40,000-100,000.

[0028] Furthermore, the preparation method of the ordinary cement-based adhesive is: mixing the components of the ordinary cement-based adhesive, and uniformly stirring them in a dry mortar mixer for 5 minutes.

[0029] The auxiliary material prepared by the present invention is a fine gray-white powdery substance, which can be well dispersed with various components in the dry powder tile adhesive, and can also be fully mixed and dissolved in the wet mortar stirred with water, thereby greatly improving the workability, consistency, cohesion, high-efficiency moisture retention, anti-slip properties of the tile adhesive, as well as the bonding strength and flexibility of the dry mortar.

[0030] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0031] 1. The product of the present invention can greatly improve the cohesiveness and consistency of tile adhesives, improve the water retention of mortars, and reduce the hazards of shrinkage cracking. It has obvious effects. As a high-efficiency moisturizing additive for tile adhesives, it is also suitable for other adhesives, such as insulation board adhesives, insulation mortars, and other mortar configurations that require high water retention and thickening.

[0032] 2. The use of the product of the present invention to prepare tile adhesives can, on the one hand, eliminate the need for multiple additives in traditional formulas that easily lead to uneven mixing. On the other hand, peanut shell straw, as a biomaterial, complies with the waste utilization principle of green building materials, energy conservation and emission reduction. In addition, from a technical perspective, the multifunctionality of tile adhesives is improved. One additive can improve the moisture retention, thickening, crack resistance, shrinkage reduction and other functions of tile adhesives.

[0033] 3. The present invention can improve the anti-slip property and flexibility of the additive by adding modified peanut shells to the system. Meanwhile, the peanut shells are soaked in acetone aqueous solution and NaOH aqueous solution in sequence, which can also prolong the air-drying time of the adhesive and increase the air-drying strength of the adhesive.

[0034] 4. In the present invention, the bonding strength of the adhesive can be improved by adding calcium hydroxide and EDTA4Na while modifying the peanut shell. Moreover, when the modified peanut shell straw, calcium hydroxide and EDTA4Na are in a specific ratio, the water immersion strength of the adhesive can also be improved.

[0035] 5. When the weight ratio of hydroxyethyl urea: (propylene glycol + butylene glycol): zinc pyrrolidone carboxylate: (trehalose + hyaluronic acid) is within a specific range, a synergistic effect can be achieved, which not only helps to improve the freeze-thaw strength of the adhesive after freeze-thaw cycles, but also helps to stabilize the aging resistance strength after heat curing.

[0036] 6. The high-efficiency moisturizing multifunctional additive of the present invention is added to ordinary cement-based adhesive. There is no need to add too many kinds of other additives to the ordinary cement-based adhesive. The composition of the ordinary cement-based adhesive can be kept simpler, which not only improves the use effect but also reduces the cost. It has broad market prospects and extremely high application value. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The raw materials used in the present invention are purchased from the following manufacturers:

[0039] Trehalose was purchased from Dezhou Huiyang Biotechnology Co., Ltd.

[0040] Hyaluronic acid was purchased from Shaanxi Sanhe Pharmaceutical Co., Ltd. with a molecular weight of 800,000-1.5 million.

[0041] Zinc pyrrolidone carboxylate was purchased from Shanxi Huapeptide Biotechnology Co., Ltd.

[0042] Cement uses Huaxin PO42.5R.

[0043] Redispersible latex powder, using German Wacker 5010N.

[0044] Cellulose ether (molecular weight 60,000) was made from Japan's Shin-Etsu MH60001P6.

[0045] Nano-silicon dioxide, particle size 50±5nm, specific surface area 200±30m 2 / g.

[0046] Sand, washed river sand 40-140 mesh, purchased from Hebei Lingshou Qihong Mining Co., Ltd.

[0047] Example 1

[0048] The present embodiment provides a high-efficiency moisturizing multifunctional additive for tile adhesive, comprising the following components in parts by weight: comprising the following components in parts by weight: 20 parts of modified peanut shell straw, 20 parts of calcium hydroxide, 5 parts of EDTA4Na, 10 parts of hydroxyethyl urea, 10 parts of propylene glycol, 5 parts of butylene glycol, 11 parts of zinc pyrrolidonecarboxylate, 9 parts of trehalose, and 6 parts of hyaluronic acid.

[0049] The preparation method of the modified peanut shell straw comprises the following steps:

[0050] (1) compacting, crushing and grinding the peanut shells in sequence to obtain peanut shell straws of 1-2 mm;

[0051] (2) adding 10 parts by weight of peanut shell straw to 32 parts by weight of a 45% acetone aqueous solution at 70° C. and hot grinding at a speed of 350 rpm for 1.5 h;

[0052] (3) cooling to 45° C., adding 43 parts by weight of a 54% sodium hydroxide aqueous solution, and immersing for 45 hours;

[0053] (4) Then, the mixture is neutralized with an aqueous glacial acetic acid solution having a mass concentration of 59% to a pH value of 7.0, and finally centrifuged, separated, and dried to obtain the modified peanut shell straw.

[0054] The preparation method of the highly efficient moisturizing multifunctional additive for tile adhesive comprises the following steps: uniformly mixing modified peanut shell straw, calcium hydroxide and EDTA4 sodium, then adding the remaining components and uniformly mixing to obtain the highly efficient moisturizing multifunctional additive for tile adhesive.

[0055] Example 2

[0056] The present embodiment provides a high-efficiency moisturizing multifunctional additive for tile adhesive, comprising the following components in parts by weight: comprising the following components in parts by weight: 20 parts of modified peanut shell straw, 20 parts of calcium hydroxide, 8 parts of hydroxyethyl urea, 4 parts of EDTA4Na, 7 parts of propylene glycol, 8 parts of butylene glycol, 10 parts of zinc pyrrolidonecarboxylate, 7 parts of trehalose and 7 parts of hyaluronic acid.

[0057] The preparation method of the modified peanut shell straw comprises the following steps:

[0058] (1) compacting, crushing and grinding the peanut shells in sequence to obtain peanut shell straws of 1-2 mm;

[0059] (2) adding 10 parts by weight of peanut shell straw to 30 parts by weight of 80° C. 40% acetone aqueous solution, and hot grinding at a speed of 400 rpm for 1 hour;

[0060] (3) cooling to 50° C., adding 40 parts by weight of a 55% sodium hydroxide aqueous solution, and immersing for 50 hours;

[0061] (4) Then, the mixture is neutralized with an aqueous glacial acetic acid solution having a mass concentration of 58% to a pH value of 7.5, and finally centrifuged, separated, and dried to obtain the modified peanut shell straw.

[0062] The preparation method of the highly efficient moisturizing multifunctional additive for tile adhesive comprises the following steps: uniformly mixing modified peanut shell straw, calcium hydroxide and EDTA4 sodium, then adding the remaining components and uniformly mixing to obtain the highly efficient moisturizing multifunctional additive for tile adhesive.

[0063] Comparative Example 1

[0064] The difference between this comparative example and Example 1 is: a high-efficiency moisturizing multifunctional additive for tile adhesive, comprising the following components in parts by weight: comprising the following components in parts by weight: 5 parts of modified peanut shell straw, 5 parts of calcium hydroxide, 5 parts of EDTA4Na, 25 parts of hydroxyethyl urea, 25 parts of propylene glycol, 10 parts of butylene glycol, 21 parts of zinc pyrrolidonecarboxylate, 4 parts of trehalose, and 1 part of hyaluronic acid.

[0065] Comparative Example 2

[0066] The difference between this comparative example and Example 1 is: a high-efficiency moisturizing multifunctional additive for tile adhesive, comprising the following components in parts by weight: comprising the following components in parts by weight: 10 parts of modified peanut shell straw, 25 parts of calcium hydroxide, 10 parts of EDTA4Na, 10 parts of hydroxyethyl urea, 10 parts of propylene glycol, 5 parts of butylene glycol, 11 parts of zinc pyrrolidonecarboxylate, 9 parts of trehalose, and 6 parts of hyaluronic acid.

[0067] Comparative Example 3

[0068] The difference between this comparative example and Example 1 is: a high-efficiency moisturizing multifunctional additive for tile adhesive, comprising the following components in parts by weight: comprising the following components in parts by weight: 20 parts of modified peanut shell straw, 20 parts of calcium hydroxide, 5 parts of EDTA4Na, 5 parts of hydroxyethyl urea, 10 parts of propylene glycol, 10 parts of butylene glycol, 6 parts of zinc pyrrolidonecarboxylate, 9 parts of trehalose, and 11 parts of hyaluronic acid.

[0069] Comparative Example 4

[0070] The difference between this comparative example and Example 1 is: a high-efficiency moisturizing multifunctional additive for tile adhesive, comprising the following components in parts by weight: comprising the following components in parts by weight: 15 parts of modified peanut shell straw, 20 parts of calcium hydroxide, 5 parts of EDTA4Na, 15 parts of hydroxyethyl urea, 7 parts of propylene glycol, 5 parts of butylene glycol, 6 parts of zinc pyrrolidonecarboxylate, 17 parts of trehalose, and 6 parts of hyaluronic acid.

[0071] Performance Testing

[0072] Ordinary cement-based adhesive was prepared using the high-efficiency moisturizing multifunctional additives prepared in Examples 1-2 and Comparative Examples 1-4. Ordinary cement-based adhesive was not added with the high-efficiency moisturizing multifunctional additive of the present invention, serving as a control group.

[0073] Specifically, the ordinary cement-based adhesive comprises the following components in weight percentage: 35% cement, 3.6% redispersible latex powder, 0.4% cellulose ether (molecular weight 60,000), 0.8% high-efficiency moisturizing multifunctional additive, 1.0% nano-silicon dioxide, 21% water, and the balance is sand. The preparation method of the ordinary cement-based adhesive is: mix the components of the ordinary cement-based adhesive, and stir them evenly for 5 minutes in a dry mortar mixer.

[0074] The performance of the above-mentioned ordinary cement-based adhesive was tested with reference to the JC / T547-2017 "Ceramic Wall and Floor Tile Adhesive" standard.

[0075] Specific test method for tile adhesive open time: Use a notched trowel to comb the tile adhesive stripes on the surface of the concrete slab, start timing, and after leaving it in the air for 15 minutes, place a ceramic tile for measuring the air-standing strength every 1 minute, place a 2kg weight for 30 seconds according to the standard method, then pry open the ceramic tile and check the wetted area of ​​the glue on the back of the ceramic tile. When the wetted area is less than 30%, this is regarded as the open time of the tile adhesive.

[0076] The results are shown in Table 1.

[0077] Table 1 Performance test results

[0078]

[0079]

[0080] It can be seen from the above performance test results that the ordinary cement-based adhesive prepared using the high-efficiency moisturizing multifunctional additives of Examples 1-2 has excellent comprehensive performance, especially the comprehensive performance of Example 1 is the most outstanding, which is mainly due to the synergistic effect of the components of the high-efficiency moisturizing multifunctional additives and the synergistic effect of other components in the ordinary cement-based adhesive.

[0081] The comparative example is not adopted the necessary technical scheme, which leads to the fact that it is obviously worse than the embodiment in the corresponding performance test. In comparative example 1, the components of the highly efficient and moisturizing multifunctional auxiliary agent exceed the scope of the present invention. It can be seen that the bonding strength is significantly reduced, the anti-slip property and flexibility are significantly reduced, and the comprehensive effect of the adhesive is reduced, which proves that there is a synergistic effect between the components of the highly efficient and moisturizing multifunctional auxiliary agent. In comparative example 2, the weight ratio of modified peanut shell straw, calcium hydroxide, and EDTA4Na is changed. From the result, it can be seen that the bonding strength is reduced comprehensively, especially the air-drying strength is significantly reduced, the adhesive open time is shortened, and the anti-slip property and lateral deformation performance are also reduced, which further proves the advantages of the modified peanut shell straw and the advanced nature of the present invention. In comparative example 3, the weight ratio of hydroxyethyl urea: (propylene glycol + butylene glycol): zinc pyrrolidone carboxylate: (trehalose + hyaluronic acid) is changed, and the adhesive bonding strength is also reduced, especially in the experimental process, it is found that the stability of freeze-thaw cycle and aging resistance strength is deteriorated, and the data discreteness is particularly strong, which increases the difficulty of material quality control for engineering construction. In Comparative Example 4, the composition ratio of the high-efficiency moisturizing multifunctional additive was changed. It can be seen that the bonding strength, anti-slip properties and lateral deformation of the adhesive were all affected, especially the air-standing strength and open time were significantly reduced, which further proved that the components of the high-efficiency moisturizing multifunctional additive had a synergistic effect. In the control group, the high-efficiency moisturizing multifunctional additive was not added, and the comprehensive effect of the adhesive was not ideal. The above experimental results further proved the importance of the technical solution defined in the present invention for its technical effect.

[0082] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A highly efficient moisturizing multifunctional additive for tile adhesive, characterized in that: The invention comprises the following components in parts by weight: 10-30 parts of modified peanut shell straw, 10-30 parts of calcium hydroxide, 5-20 parts of hydroxyethyl urea, 1-10 parts of EDTA4Na, 0-20 parts of propylene glycol, 0-20 parts of butylene glycol, 1-20 parts of zinc pyrrolidonecarboxylate, 1-20 parts of trehalose and 1-10 parts of hyaluronic acid.

2. The high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 1, characterized in that: The preparation method of the modified peanut shell straw comprises the following steps: (1) compacting, crushing and grinding the peanut shells in sequence to obtain peanut shell straws of 1-2 mm; (2) adding 10 parts by weight of peanut shell straw to 30-35 parts by weight of 60-80° C. acetone aqueous solution, and hot grinding at a speed of 300 rpm-400 rpm for 1-2 hours; (3) cooling to 40-50° C., adding 40-46 parts by weight of a 52-55% sodium hydroxide aqueous solution, and immersing for 40-50 hours; (4) Then, the mixture is neutralized with a glacial acetic acid aqueous solution having a mass concentration of 58-60% to a pH value of 6.5-7.5, and finally centrifuged, separated, and dried to obtain modified peanut shell straw.

3. The high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 2, characterized in that: The mass concentration of the acetone aqueous solution is 40-50%.

4. The high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 18-24 parts of modified peanut shell straw, 16-21 parts of calcium hydroxide, 8-14 parts of hydroxyethyl urea, 3-7 parts of EDTA4Na, 7-12 parts of propylene glycol, 3-8 parts of butylene glycol, 10-15 parts of zinc pyrrolidone carboxylate, 7-13 parts of trehalose and 5-9 parts of hyaluronic acid.

5. The high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 4, characterized in that: The weight ratio of modified peanut shell straw, calcium hydroxide and EDTA4Na is (20-22):(18-20):(4-6).

6. The high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 5, characterized in that: The weight ratio of hydroxyethyl urea: (propylene glycol + butylene glycol): zinc pyrrolidone carboxylate: (trehalose + hyaluronic acid) is (8-14): (12-17): (10-13): (13-16).

7. The high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 6, characterized in that: The invention comprises the following components in parts by weight: 20 parts of modified peanut shell straw, 20 parts of calcium hydroxide, 5 parts of EDTA4Na, 10 parts of hydroxyethyl urea, 10 parts of propylene glycol, 5 parts of butylene glycol, 11 parts of zinc pyrrolidone carboxylate, 9 parts of trehalose and 5 parts of hyaluronic acid.

8. A method for preparing the highly efficient moisturizing multifunctional additive for tile adhesive according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: uniformly mixing modified peanut shell straw, calcium hydroxide and EDTA4 sodium, adding the remaining components, and uniformly mixing to obtain a highly efficient moisturizing multifunctional additive for tile adhesive.

9. Use of the high-efficiency moisturizing multifunctional additive for tile adhesive according to any one of claims 1 to 7.

10. The use of the high-efficiency moisturizing multifunctional additive for tile adhesive according to claim 9, characterized in that: The invention discloses an application of the high-efficiency moisturizing multifunctional additive for tile adhesive in the preparation of ordinary cement-based adhesive. The ordinary cement-based adhesive comprises the following components in weight percentage: 30-40% cement, 0-5% redispersible latex powder, 0.3-0.5% cellulose ether, 0.5-1% high-efficiency moisturizing multifunctional additive, 0.8-1.2% nano silicon dioxide, 20-22% water, and the balance is sand.

Images