A degradable formaldehyde mortar material, a preparation method and application thereof

Abstract

The application relates to the technical field of building materials, and particularly discloses a mortar material capable of degrading formaldehyde as well as a preparation method and application thereof. The mortar material capable of degrading formaldehyde comprises the following raw material components in mass fractions: cement 75-95 parts, quartz sand 100-130 parts, reinforcing agent 10-15 parts, water reducing agent 1-2 parts, dispersant 3-5 parts, stabilizer 0.5-1 part and composite degradation material 30-50 parts; wherein the composite degradation material comprises yttria modified sericite powder, expanded graphite powder loaded with manganese dioxide and tourmaline powder. The mortar material capable of degrading formaldehyde provided by the application has good compressive strength and bending strength and excellent formaldehyde degradation performance, can realize rapid formaldehyde degradation, does not need to rely on a light source, and effectively makes up for the defects of the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, in particular to a degradable formaldehyde mortar material and a preparation method and application thereof. BACKGROUND

[0002] Formaldehyde (HCHO) is a volatile organic compound with high toxicity, which widely exists in indoor decoration materials such as artificial board, paint and adhesive, and its release period is as long as 3-15 years. Long-term exposure of human body to formaldehyde environment can cause respiratory diseases, abnormal immune function, and even cancer. As the main finishing and decoration material of indoor wall, the mortar material has the characteristics of large area and long-term exposure to indoor environment. If it can be endowed with the function of degrading formaldehyde, it can reduce the indoor formaldehyde concentration from the source, which has important practical significance. In recent years, researchers have developed formaldehyde-degrading mortar with mechanical properties and purification function by introducing photocatalytic materials, adsorbent materials or composite functional fillers into the mortar material, which has become a research frontier in the field of building functional materials.

[0003] In the prior art, photocatalysts are often added to the mortar material to generate hydroxyl radicals under the action of ultraviolet light or visible light, which oxidizes formaldehyde into carbon dioxide and water. However, this method depends on light sources and the preparation cost of the photocatalyst used is high. There are also reports of using microorganisms to degrade formaldehyde. By screening high-efficiency degrading bacteria and fixing them on a carrier, a mortar material is prepared by mixing with other raw materials. However, this method of degrading formaldehyde is greatly affected by the environment and has a slow reaction with formaldehyde, which requires a long processing time.

[0004] Therefore, it is of great significance to develop a mortar material that can quickly degrade formaldehyde without relying on external light sources in the field of building functional materials. SUMMARY

[0005] In view of this, the present application provides a degradable formaldehyde mortar material and a preparation method and application thereof. The degradable formaldehyde mortar material is prepared by using cement as a cementitious material, quartz sand, a reinforcing agent and a composite degradable material as filling aggregates and main functional raw materials, and a water reducing agent, a dispersing agent and a stabilizer as auxiliary agents. The present application utilizes the synergistic effect of each raw material component to make the obtained degradable formaldehyde mortar material have the advantages of quickly degrading formaldehyde without relying on external light sources, effectively making up for the shortcomings of the prior art.

[0006] To achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0007] The application provides a mortar material capable of degrading formaldehyde, and comprises the following raw material components in mass fractions: cement 75-95 parts, quartz sand 100-130 parts, reinforcing agent 10-15 parts, water reducing agent 1-2 parts, dispersing agent 3-5 parts, stabilizer 0.5-1 part and composite degradation material 30-50 parts.

[0008] The composite degradation material comprises yttria modified sericite powder, expanded graphite powder loaded with manganese dioxide and tourmaline powder.

[0009] Compared with the prior art, the application provides a mortar material capable of degrading formaldehyde, which utilizes yttria modified sericite powder, expanded graphite powder loaded with manganese dioxide and tourmaline powder as main degradation materials. The yttria modified sericite powder degrades formaldehyde through a synergistic adsorption-catalytic oxidation mechanism. The sericite powder has a two-dimensional sheet structure and porous characteristics, a large specific surface area, and a surface rich in active groups such as hydroxyl groups. It can capture formaldehyde molecules through van der Waals forces and electrostatic attraction, and enrich them on the material surface, providing a high-concentration reaction environment for the catalytic degradation of yttria. Moreover, the layer-by-layer stacking of the sheet structure forms channels, prolongs the diffusion path of formaldehyde molecules, increases the adsorption contact time, and achieves efficient removal of formaldehyde. Yttria has abundant surface oxygen vacancies and Lewis acid sites, which can adsorb and activate oxygen and water in the air to generate active oxygen with strong oxidizing properties, which oxidizes and decomposes formaldehyde molecules into carbon dioxide and water. Moreover, the Lewis acid sites can polarize formaldehyde molecules, reduce the activation energy of formaldehyde oxidation, and accelerate its oxidative decomposition. More importantly, the yttria modified sericite powder does not rely on light sources to activate the reaction, and can purify formaldehyde in a light-free or weak light environment.

[0010] Expanded graphite has a loose and porous vermicular structure, and can be used as a carrier for manganese dioxide particles to provide a reaction channel for manganese dioxide to degrade formaldehyde. The degradation products can be desorbed from the pores of the expanded graphite, releasing adsorption sites, thereby realizing the recycling of the material. Moreover, the electrical conductivity of expanded graphite can promote electron transfer on the surface of manganese dioxide, inhibit the ineffective recombination of active oxygen species, and indirectly improve the catalytic efficiency. Moreover, manganese dioxide is reduced to trivalent manganese ions after oxidizing and degrading formaldehyde molecules, and is then re-oxidized to tetravalent manganese by oxygen in the air, realizing cyclic regeneration and maintaining long-term degradation ability of formaldehyde. In addition, the entire process does not require a light source and can continuously treat formaldehyde at room temperature.

[0011] Tourmaline powder can release air negative ions, which can oxidize and reduce formaldehyde molecules through strong reducing properties, and cooperate with the yttria modified sericite powder and the expanded graphite powder loaded with manganese dioxide to jointly purify formaldehyde in the air. The addition of tourmaline powder can reduce the degradation cost and improve the degradation efficiency.

[0012] The present application uses cement as cementitious material; quartz sand, reinforcing agent as filling aggregate and main functional raw material; water reducing agent, dispersing agent and stabilizer as auxiliary agent, combined with composite degradation material to prepare a mortar material which can quickly and efficiently degrade formaldehyde and does not depend on light source, effectively solving the problems of slow degradation effect and dependence on light source existing in the existing formaldehyde-degrading mortar material.

[0013] Preferably, the formaldehyde-degradable mortar material further comprises water 90-110 parts.

[0014] Preferably, the composite degradation material comprises the following mass percentage of raw material components: 15%-25% of yttrium oxide modified sericite powder, 20%-40% of expanded graphite powder loaded with manganese dioxide, and the balance of tourmaline powder.

[0015] Preferably, the preparation method of the yttrium oxide modified sericite powder comprises the following steps:

[0016] Disperse the sericite powder in water to obtain a suspension; add a yttrium salt solution to the suspension, mix uniformly, add a precipitant, stand, solid-liquid separation, dry to obtain a mixture;

[0017] Heat the mixture to 650-780 DEG C for calcination, ball milling to obtain the yttrium oxide modified sericite powder.

[0018] Further preferably, the mass-volume ratio of the sericite to water is 1g:2mL-1g:3mL.

[0019] Further preferably, the concentration of the yttrium salt solution is 0.1mol / L-0.3mol / L.

[0020] Further preferably, the yttrium salt solution is any one or more of yttrium chloride solution, yttrium nitrate solution or yttrium sulfate solution.

[0021] Further preferably, the volume ratio of the suspension to the yttrium salt solution is 3:1-5:1.

[0022] Further preferably, the precipitant is any one of sodium carbonate, ammonium carbonate, sodium oxalate or ammonium oxalate.

[0023] Further preferably, the addition amount of the precipitant is 1%-3% of the mass of the suspension;

[0024] Further preferably, the calcination time is 2h-4h;

[0025] Further preferably, the temperature is raised to 650-780 DEG C by programmed heating, and the heating rate is 5 DEG C / min-10 DEG C / min;

[0026] Further preferably, the rotation speed of the ball mill is 300 rpm-500 rpm, and the ball milling time is 30 min-50 min.

[0027] Preferably, the preparation method of the expanded graphite powder loaded with manganese dioxide comprises the following steps:

[0028] The expanded graphite is calcined at 200℃-300℃, and then cooled to obtain pretreated expanded graphite;

[0029] The pretreated expanded graphite is immersed in the manganese source solution, and then solid-liquid separation is performed; the solid residue is sintered at 450-620℃ under an inert atmosphere, and then ground to obtain the expanded graphite powder loaded with manganese dioxide.

[0030] Further preferably, the calcination time is 1 h-2 h.

[0031] Further preferably, the concentration of the manganese source solution is 0.3 mol / L-0.5 mol / L.

[0032] Further preferably, the manganese source solution is potassium permanganate solution or manganese sulfate solution.

[0033] Further preferably, the mass-to-volume ratio of the pretreated expanded graphite to the manganese source solution is 1 g:3 mL-1 g:5 mL.

[0034] Further preferably, the sintering time is 3 h-5 h.

[0035] Further preferably, the particle size of the yttria-modified sericite powder is 50 μm-100 μm.

[0036] Further preferably, the particle size of the expanded graphite powder loaded with manganese dioxide is 80 μm-150 μm.

[0037] Preferably, the particle size of the tourmaline powder is 60 μm-90 μm.

[0038] Preferably, the cement is Portland cement.

[0039] Further preferably, the Portland cement is P.O42.5 type Portland cement.

[0040] Preferably, the particle size of the quartz sand is 400 μm-600 μm.

[0041] Preferably, the reinforcing agent is calcium carbonate.

[0042] Calcium carbonate is a weak alkaline substance, which can adjust the alkaline environment of the mortar system, assist in neutralizing the formic acid generated by the degradation of formaldehyde, and accelerate the mineralization to generate carbon dioxide and water.

[0043] Further preferably, the particle size of the calcium carbonate is 50-60 μm.

[0044] Preferably, the water reducing agent is any one of lignin sulfonate water reducing agent, naphthalene series superplasticizer, aliphatic superplasticizer, amino superplasticizer or polycarboxylic superplasticizer.

[0045] Preferably, the dispersant is a fatty acid dispersant.

[0046] Preferably, the stabilizer is any one of EL0002, TAB-2 or T-386.

[0047] The second aspect of the present application provides a preparation method of the degradable formaldehyde mortar material, comprising the following steps:

[0048] According to the designed proportion, each raw material component is weighed, and the weighed components are uniformly mixed to obtain the degradable formaldehyde mortar material.

[0049] The third aspect of the present application provides the application of the degradable formaldehyde mortar material or the degradable formaldehyde mortar material prepared by the preparation method of the degradable formaldehyde mortar material in the field of building materials.

[0050] In summary, the present application successfully prepares a degradable formaldehyde mortar material by taking cement as a cementitious system, quartz sand and a reinforcing agent as filling aggregates and core functional substrates, supplementing with water reducing agent, dispersant and stabilizer and the like, and introducing a composite degradable material. The mortar material realizes rapid and efficient degradation of formaldehyde, and the entire degradation process does not need to rely on light source, effectively overcoming the technical difficulties of slow degradation rate and strong dependence on light source commonly existing in the existing formaldehyde degradation mortar material. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0052] The Portland cement used in the following examples and comparative examples is a commercially available P.O42.5 type Portland cement.

[0053] The quartz sand, calcium carbonate, water reducing agent, tourmaline powder and dispersant used in the following examples and comparative examples are commercially available materials.

[0054] Example 1

[0055] The present embodiment provides a degradable formaldehyde mortar material and a preparation method thereof, specifically comprising the following contents:

[0056] The degradable formaldehyde mortar material comprises raw material components in mass fractions of 85 parts of Portland cement, 110 parts of quartz sand, 12 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 3 parts of fatty acid dispersant, 0.8 parts of EL0002 stabilizer, 40 parts of composite degradation material and 90 parts of water.

[0057] The composite degradation material comprises raw material components in mass percentages of 20% of yttria modified sericite powder, 35% of expanded graphite powder loaded with manganese dioxide and 45% of tourmaline powder; the particle size of the yttria modified sericite powder is 80-120 μm; the particle size of the expanded graphite powder loaded with manganese dioxide is 80-100 μm; and the particle size of the tourmaline powder is 60-80 μm.

[0058] The particle size of the quartz sand is 400-600 μm; and the particle size of the calcium carbonate is 50-60 μm.

[0059] The raw material components are weighed according to the designed ratio, and the weighed components are mixed uniformly to obtain the degradable formaldehyde mortar material.

[0060] The preparation method of the yttria modified sericite powder comprises the following steps:

[0061] 500 g of sericite powder is dispersed in 1200 mL of water to obtain a suspension; 400 mL of 0.2 mol / L yttrium chloride solution is added to the suspension, mixed uniformly, 40 g of sodium carbonate is added, and then the mixture is allowed to stand, solid-liquid separation is performed, and drying is performed to obtain a mixture;

[0062] The mixture is calcined at a temperature increasing rate of 10 ℃ / min to 700 ℃ for 3 h, and then cooled; the calcined product is ball milled at a rotating speed of 400 rpm for 35 min to obtain the yttria modified sericite powder.

[0063] The preparation method of the expanded graphite powder loaded with manganese dioxide comprises the following steps:

[0064] 500 g of expanded graphite is calcined at 250 ℃ for 1.5 h to obtain pretreated expanded graphite;

[0065] The pretreated expanded graphite is immersed in 2000 mL of 0.4 mol / L manganese sulfate solution, and then solid-liquid separation is performed; the solid filter is sintered at 520 ℃ for 4 h under an inert atmosphere, and then ground to obtain the expanded graphite powder loaded with manganese dioxide.

[0066] Example 2

[0067] The embodiment provides a degradable formaldehyde mortar material and a preparation method thereof, and specifically comprises the following contents.

[0068] The degradable formaldehyde mortar material comprises the following raw material components in mass fraction: 90 parts of Portland cement, 120 parts of quartz sand, 15 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 3 parts of fatty acid dispersant, 1 part of TAB-2 stabilizer, 30 parts of composite degradation material and 90 parts of water.

[0069] The composite degradation material comprises the following raw material components in mass percentage: 18% of yttria modified sericite powder, 38% of expanded graphite powder loaded with manganese dioxide and 44% of tourmaline powder; the particle size of the yttria modified sericite powder is 80-120 mu m; the particle size of the expanded graphite powder loaded with manganese dioxide is 80-100 mu m; and the particle size of the tourmaline powder is 60-80 mu m.

[0070] The particle size of the quartz sand is 400-600 mu m; and the particle size of the calcium carbonate is 50-60 mu m.

[0071] According to the design ratio, the raw material components are weighed, and the weighed components are uniformly mixed to obtain the degradable formaldehyde mortar material.

[0072] The preparation method of the yttria modified sericite powder comprises the following steps.

[0073] 500 g of sericite powder is dispersed in 1200 mL of water to obtain a suspension; 400 mL of 0.2 mol / L yttrium chloride solution is added to the suspension, mixed uniformly, 40 g of sodium carbonate is added, and then the mixture is allowed to stand, solid-liquid separation is performed, and drying is performed to obtain a mixture;

[0074] The mixture is calcined at a temperature increasing rate of 10 ℃ / min to 700 ℃ for 3 h, and then cooled; the calcined product is ball milled at a rotating speed of 400 rpm for 35 min to obtain the yttria modified sericite powder.

[0075] The preparation method of the expanded graphite powder loaded with manganese dioxide comprises the following steps.

[0076] 500 g of expanded graphite is calcined at 250 ℃ for 1.5 h to obtain pretreated expanded graphite;

[0077] The pretreated expanded graphite is immersed in 2000 mL of 0.4 mol / L manganese nitrate solution, and then solid-liquid separation is performed; under an inert atmosphere, the solid filter is sintered at 500 ℃ for 4 h, and then ground to obtain the expanded graphite powder loaded with manganese dioxide.

[0078] Embodiment 3

[0079] The embodiment provides a degradable formaldehyde mortar material and a preparation method thereof, and specifically comprises the following contents.

[0080] The degradable formaldehyde mortar material comprises the following raw material components in mass fraction: 75 parts of Portland cement, 100 parts of quartz sand, 15 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 3 parts of fatty acid dispersant, 1 part of T-386 stabilizer, 35 parts of composite degradation material and 90 parts of water.

[0081] The composite degradation material comprises the following raw material components in mass percentage: 22% of yttria modified sericite powder, 38% of expanded graphite powder loaded with manganese dioxide and 40% of tourmaline powder; the particle size of the yttria modified sericite powder is 80-120 mu m; the particle size of the expanded graphite powder loaded with manganese dioxide is 80-100 mu m; and the particle size of the tourmaline powder is 60-80 mu m.

[0082] The particle size of the quartz sand is 400-600 mu m; and the particle size of the calcium carbonate is 50-60 mu m.

[0083] According to the design ratio, the raw material components are weighed, and the weighed components are uniformly mixed to obtain the degradable formaldehyde mortar material.

[0084] The preparation method of the yttria modified sericite powder comprises the following steps.

[0085] 500g of sericite powder is dispersed in 1200mL of water to obtain a suspension; 400mL of 0.2mol / L yttrium chloride solution is added to the suspension, mixed uniformly, 40g of sodium carbonate is added, and then the mixture is allowed to stand, solid-liquid separation is performed, and drying is performed to obtain a mixture;

[0086] The mixture is calcined at a temperature increasing rate of 10℃ / min to 700℃ for 3h, and then cooled; the calcined product is ball milled at a rotating speed of 400rpm for 35min to obtain the yttria modified sericite powder.

[0087] The preparation method of the expanded graphite powder loaded with manganese dioxide comprises the following steps.

[0088] 500g of expanded graphite is calcined at 250℃ for 1.5h to obtain pretreated expanded graphite;

[0089] The pretreated expanded graphite is immersed in 2000mL of 0.4mol / L manganese sulfate solution, and then solid-liquid separation is performed; under an inert atmosphere, the solid filter is sintered at 480℃ for 4.5h, and then ground to obtain the expanded graphite powder loaded with manganese dioxide.

[0090] Example 4

[0091] The embodiment provides a degradable formaldehyde mortar material and a preparation method thereof, and specifically comprises the following contents.

[0092] The degradable formaldehyde mortar material comprises the following raw material components in mass fraction: 95 parts of Portland cement, 120 parts of quartz sand, 10 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 5 parts of fatty acid dispersant, 1 part of EL0002 stabilizer, 50 parts of composite degradation material and 90 parts of water.

[0093] The composite degradation material comprises the following raw material components in mass percentage: 25% of yttria modified sericite powder, 40% of expanded graphite powder loaded with manganese dioxide and 35% of tourmaline powder; the particle size of the yttria modified sericite powder is 80-120 mu m; the particle size of the expanded graphite powder loaded with manganese dioxide is 80-100 mu m; and the particle size of the tourmaline powder is 60-80 mu m.

[0094] The particle size of the quartz sand is 400-600 mu m; and the particle size of the calcium carbonate is 50-60 mu m.

[0095] According to the design ratio, the raw material components are weighed, and the weighed components are uniformly mixed to obtain the degradable formaldehyde mortar material.

[0096] The preparation method of the yttria modified sericite powder comprises the following steps.

[0097] 500 g of sericite powder is dispersed in 1200 mL of water to obtain a suspension; 400 mL of 0.2 mol / L yttrium chloride solution is added to the suspension, mixed uniformly, 40 g of sodium carbonate is added, and then the mixture is allowed to stand, solid-liquid separation is performed, and drying is performed to obtain a mixture;

[0098] The mixture is calcined at a temperature increasing rate of 10 ℃ / min to 700 ℃ for 3 h, and then cooled; the calcined product is ball milled at a rotating speed of 400 rpm for 35 min to obtain the yttria modified sericite powder.

[0099] The preparation method of the expanded graphite powder loaded with manganese dioxide comprises the following steps.

[0100] 500 g of expanded graphite is calcined at 250 ℃ for 1.5 h to obtain pretreated expanded graphite;

[0101] The pretreated expanded graphite is immersed in 2000 mL of 0.4 mol / L manganese sulfate solution, and then solid-liquid separation is performed; under an inert atmosphere, the solid filter is sintered at 620 ℃ for 3 h, and then ground to obtain the expanded graphite powder loaded with manganese dioxide.

[0102] Example 5

[0103] The embodiment provides a degradable formaldehyde mortar material and a preparation method thereof, and specifically comprises the following contents.

[0104] The degradable formaldehyde mortar material comprises the following raw material components in mass fraction: 75 parts of Portland cement, 100 parts of quartz sand, 15 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 5 parts of fatty acid dispersant, 0.5 parts of T-386 stabilizer, 50 parts of composite degradation material and 90 parts of water.

[0105] The composite degradation material comprises the following raw material components in mass percentage: 15% of yttria modified sericite powder, 40% of expanded graphite powder loaded with manganese dioxide and 45% of tourmaline powder; the particle size of the yttria modified sericite powder is 80-120 μm; the particle size of the expanded graphite powder loaded with manganese dioxide is 80-100 μm; and the particle size of the tourmaline powder is 60-80 μm.

[0106] The particle size of the quartz sand is 400-600 μm; and the particle size of the calcium carbonate is 50-60 μm.

[0107] The raw material components are weighed according to the designed proportion, and the weighed components are uniformly mixed to obtain the degradable formaldehyde mortar material.

[0108] The preparation method of the yttria modified sericite powder comprises the following steps:

[0109] 500 g of sericite powder is dispersed in 1200 mL of water to obtain a suspension; 400 mL of 0.2 mol / L yttrium chloride solution is added to the suspension, mixed uniformly, 40 g of sodium carbonate is added, and then the mixture is left to stand, solid-liquid separation is performed, and drying is performed to obtain a mixture;

[0110] The mixture is calcined at a temperature increasing rate of 10 ℃ / min to 700 ℃ for 3 h, and then cooled; the calcined product is ball milled at a rotating speed of 400 rpm for 35 min to obtain the yttria modified sericite powder.

[0111] The preparation method of the expanded graphite powder loaded with manganese dioxide comprises the following steps:

[0112] 500 g of expanded graphite is calcined at 250 ℃ for 1.5 h to obtain pretreated expanded graphite;

[0113] The pretreated expanded graphite is immersed in 2000 mL of 0.4 mol / L manganese sulfate solution, and then solid-liquid separation is performed; under an inert atmosphere, the solid filter is sintered at 550 ℃ for 3.5 h, and then ground to obtain the expanded graphite powder loaded with manganese dioxide.

[0114] Comparative Example 1 Comparative Example 2

[0115] The comparative example provides a degradable formaldehyde mortar material and a preparation method thereof, which is different from example 1 in that the yttria modified sericite powder is replaced by an equal amount of zirconia modified sericite powder, and other ingredients and processes are unchanged, and specifically includes the following contents:

[0116] The degradable formaldehyde mortar material includes the following mass fractions of raw material components: 85 parts of Portland cement, 110 parts of quartz sand, 12 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 3 parts of fatty acid dispersant, 0.8 parts of EL0002 stabilizer, 40 parts of composite degradation material, and 90 parts of water.

[0117] The composite degradation material includes the following mass percentages of raw material components: 20% of zirconia modified sericite powder, 35% of expanded graphite powder loaded with manganese dioxide, and 45% of tourmaline powder; the particle size of the zirconia modified sericite powder is 80-120 μm; the particle size of the expanded graphite powder loaded with manganese dioxide is 80-100 μm; and the particle size of the tourmaline powder is 60-80 μm.

[0118] The particle size of the quartz sand is 400-600 μm; and the particle size of the calcium carbonate is 50-60 μm.

[0119] The raw material components are weighed according to the designed ratio, and the weighed components are mixed uniformly to obtain the degradable formaldehyde mortar material.

[0120] The preparation method of the zirconia modified sericite powder includes the following steps:

[0121] 500 g of sericite powder is dispersed in 1200 mL of water to obtain a suspension; 400 mL of 0.2 mol / L zirconium chloride solution is added to the suspension, mixed uniformly, 40 g of sodium carbonate is added, and then the mixture is allowed to stand, solid-liquid separation, and drying to obtain a mixture;

[0122] The mixture is calcined at a temperature increasing rate of 10 ℃ / min to 700 ℃ for 3 h, and then cooled; the calcined product is ball milled at a speed of 400 rpm for 35 min to obtain the zirconia modified sericite powder.

[0123] The preparation method of the expanded graphite powder loaded with manganese dioxide includes the following steps:

[0124] 500 g of expanded graphite is calcined at 250 ℃ for 1.5 h, and then cooled to obtain pretreated expanded graphite;

[0125] The pretreated expanded graphite is immersed in 2000 mL of manganese sulfate solution with a concentration of 0.4 mol / L, solid-liquid separation is performed, and the solid residue is sintered at 520℃ for 4h under an inert atmosphere, ground, and the manganese dioxide-loaded expanded graphite powder is obtained.

[0126] Comparative Example 2

[0127] The present comparative example provides a formaldehyde-degradable mortar material and a preparation method thereof, which is different from Example 1 in that the manganese dioxide-loaded expanded graphite powder is replaced by an equal amount of expanded graphite powder, and other ingredients and processes remain unchanged, and specifically includes the following contents:

[0128] The formaldehyde-degradable mortar material includes the following raw material components in mass fraction: 85 parts of Portland cement, 110 parts of quartz sand, 12 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 3 parts of fatty acid dispersant, 0.8 parts of EL0002 stabilizer, 40 parts of composite degradation material, and 90 parts of water.

[0129] The composite degradation material includes the following raw material components in mass percentage: 20% of zirconium oxide modified sericite powder, 35% of expanded graphite powder, and 45% of tourmaline powder; the particle size of the zirconium oxide modified sericite powder is 80-120 μm; the particle size of the manganese dioxide-loaded expanded graphite powder is 80-100 μm; and the particle size of the tourmaline powder is 60-80 μm.

[0130] The particle size of the quartz sand is 400-600 μm, and the particle size of the calcium carbonate is 50-60 μm.

[0131] The raw material components are weighed according to the designed ratio, and the weighed components are mixed uniformly to obtain the formaldehyde-degradable mortar material.

[0132] The preparation method of the yttrium oxide modified sericite powder includes the following steps:

[0133] 500 g of sericite powder is dispersed in 1200 mL of water to obtain a suspension; 400 mL of 0.2 mol / L yttrium chloride solution is added to the suspension, mixed uniformly, 40 g of sodium carbonate is added, and after standing, solid-liquid separation is performed, and the mixture is dried to obtain a mixed material.

[0134] The mixed material is calcined at 700℃ at a temperature rising rate of 10℃ / min for 3h, cooled, and the calcined product is ball milled at a speed of 400 rpm for 35 min to obtain the yttrium oxide modified sericite powder.

[0135] Comparative Example 3

[0136] The comparative example 1 provides a degradable formaldehyde mortar material and a preparation method thereof, and the difference from the example 1 is that the composite degradable material is replaced by an equal amount of tourmaline powder, and other ingredients and processes are not changed, and specifically includes the following contents:

[0137] The degradable formaldehyde mortar material includes the following mass fractions of raw material components: 85 parts of Portland cement, 110 parts of quartz sand, 12 parts of calcium carbonate, 2 parts of sodium lignosulfonate water reducer, 3 parts of fatty acid dispersant, 0.8 parts of EL0002 stabilizer, 40 parts of tourmaline powder and 90 parts of water.

[0138] The particle size of the tourmaline powder is 60-80 microns;

[0139] The particle size of the quartz sand is 400-600 microns; and the particle size of the calcium carbonate is 50-60 microns.

[0140] According to the designed ratio, each raw material component is weighed, and the weighed components are uniformly mixed to obtain the degradable formaldehyde mortar material.

[0141] In order to further embody the technical effect of the present application, the mortar materials obtained in examples 1-3 and comparative examples 1-3 are tested as follows: the compressive strength and flexural strength are tested according to the standard of GB / T17671-2021, and the results are shown in Table 1; the formaldehyde degradation efficiency is tested according to the standard of GB / T18580-2017, and the formaldehyde degradation rate calculation formula is: formaldehyde degradation rate = (formaldehyde initial concentration-formaldehyde stable state concentration) / formaldehyde initial concentration x 100%; and the results are shown in Table 2.

[0142] Table 1: Performance test results of each mortar material

[0143]

[0144] Table 2: Test results of degradable formaldehyde of each mortar material

[0145]

[0146] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A formaldehyde-degradable mortar material, characterized in that: The raw material components include the following parts by weight: 75-95 parts cement, 100-130 parts quartz sand, 10-15 parts reinforcing agent, 1-2 parts water-reducing agent, 3-5 parts dispersant, 0.5-1 part stabilizer, and 30-50 parts composite degradable material. The composite degradable material includes yttrium oxide modified sericite powder, expanded graphite powder loaded with manganese dioxide, and tourmaline powder. The composite degradable material comprises the following raw material components in the following mass percentages: 15%-25% yttrium oxide modified sericite powder, 20%-40% expanded graphite powder loaded with manganese dioxide, and the balance tourmaline powder. The preparation method of the yttrium oxide modified sericite powder includes the following steps: Sericite powder is dispersed in water to obtain a suspension; yttrium salt solution is added to the suspension, mixed evenly, a precipitant is added, the mixture is allowed to stand, solid-liquid separation is performed, and the mixture is dried to obtain a mixture. The mixture was heated to 650℃-780℃ and calcined, then ball-milled to obtain the yttrium oxide modified sericite powder. The preparation method of the expanded graphite powder loaded with manganese dioxide includes the following steps: Expanded graphite was calcined at 200℃-300℃ and then cooled to obtain pretreated expanded graphite. The pretreated expanded graphite was immersed in a manganese source solution, and the solid and liquid were separated. Under an inert atmosphere, the solid filter material was sintered at 450-620°C and ground to obtain the expanded graphite powder loaded with manganese dioxide. The reinforcing agent is calcium carbonate.

2. The formaldehyde-degradable mortar material as described in claim 1, characterized in that, The mass-to-volume ratio of the sericite to water is 1g:2mL-1g:3mL; The concentration of the yttrium salt solution is 0.1 mol / L to 0.3 mol / L; The volume ratio of the suspension to the yttrium salt solution is 3:1 to 5:

1.

3. The formaldehyde-degradable mortar material as described in claim 1, characterized in that, The precipitant is at least one of sodium carbonate, ammonium carbonate, sodium oxalate, or ammonium oxalate. The amount of precipitant added is 1%-3% of the mass of the suspension; The calcination time is 2-4 hours; The temperature was raised to 650℃-780℃ using a programmed temperature rise method, with a heating rate of 5℃ / min-10℃ / min. The ball mill rotates at a speed of 300 rpm to 500 rpm, and the ball milling time is 30 min to 50 min.

4. The formaldehyde-degradable mortar material as described in claim 1, characterized in that: The calcination time is 1-2 hours; The concentration of the manganese source solution is 0.3 mol / L-0.5 mol / L; The manganese source solution is a potassium permanganate solution or a manganese sulfate solution; The mass-to-volume ratio of the pretreated expanded graphite to the manganese source solution is 1g:3mL-1g:5mL; The sintering time is 3-5 hours.

5. The formaldehyde-degradable mortar material as described in claim 1, characterized in that: The particle size of the yttrium oxide modified sericite powder is 50μm-100μm; The expanded graphite powder loaded with manganese dioxide has a particle size of 80μm-150μm; The tourmaline powder has a particle size of 60μm-90μm.

6. The method for preparing formaldehyde-degradable mortar material according to any one of claims 1-5, characterized in that, Includes the following steps: Weigh each raw material component according to the design ratio, mix the weighed components evenly, and obtain a formaldehyde-degradable mortar material.

7. The application of the formaldehyde-degradable mortar material as described in any one of claims 1-5, or the formaldehyde-degradable mortar material prepared by the method for preparing the formaldehyde-degradable mortar material as described in claim 6, in the field of building materials preparation.

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