Diaphragm-free pouring integrally-formed interior wall material and preparation method thereof

Abstract

The invention belongs to the technical field of environment-friendly materials, particularly relates to a diaphragm-free pouring integrally-formed interior wall material and a preparation method thereof, and belongs to the field of building materials. The formula of the interior wall material contains sulphoaluminate cement, metakaolin, pretreated sisal fibers, plant-derived anticorrosive components, lightweight aggregates and additives, and functional pigments can be added as required. During preparation, the raw materials are pretreated, are subjected to multi-step stirring and mixing and then are subjected to pouring molding, and natural or steam curing can be performed. The interior wall material has the advantages of fire prevention, corrosion prevention, strong mechanical property, light weight, sound insulation, convenience in construction, environment friendliness and the like, solves the problems of insufficient performance and complex construction of a traditional interior wall material, and has a good market application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmentally friendly materials, and in particular to the technical field of building materials, and specifically relates to a non-diaphragm casting integrated molding interior wall material and a preparation method thereof. Background Art

[0002] At present, there are many kinds of interior wall materials on the market, but there are some common problems. It is difficult for traditional interior wall materials to achieve an ideal balance in terms of fire prevention, corrosion resistance, sound insulation and other properties. For example, some common gypsum-based interior wall materials have good fire resistance, but they are easily deformed in a humid environment and have poor corrosion resistance; while some interior wall materials made of organic polymer materials have good flexibility, but insufficient fire resistance, and some materials will cause environmental pollution during the production process.

[0003] In the process of building construction, the existing interior wall materials have complex construction processes and often require multiple processes, such as primer, coating, and pasting. The construction efficiency is low, and the construction quality is greatly affected by human factors. At the same time, for some special needs, such as personalized modeling of indoor space and rapid construction, the existing interior wall materials and construction methods are difficult to meet.

[0004] In addition, as people's attention to environmental protection and health continues to increase, the development of a green, environmentally friendly, high-performance and easy-to-construct interior wall material has important market demand and practical significance. Summary of the invention

[0005] The present invention provides an interior wall material that is integrally formed by pouring without a diaphragm, and the formula composition includes:

[0006] Inorganic cementitious materials: 40-50 parts of sulphoaluminate cement, 10-15 parts of metakaolin;

[0007] Plant fiber reinforcement material: 5-8 parts of pretreated sisal fiber;

[0008] Plant-derived preservative ingredients: 2-4 parts of neem bark extract, 1-3 parts of calamus rhizome extract;

[0009] Lightweight aggregate: 8-12 parts of expanded perlite, 5-10 parts of closed-cell vitrified microspheres;

[0010] Additives: polycarboxylic acid water reducer 0.2-0.5 parts, retarder sodium gluconate 0.1-0.3 parts, air entraining agent sodium dodecyl sulfate 0.05-0.1 parts.

[0011] Furthermore, in the inorganic gelling material, sulphoaluminate cement and metakaolin are mixed in a high-speed mixer at a speed of 600-800 rpm for 10-15 minutes to make them fully and evenly dispersed.

[0012] Furthermore, the pretreatment method of the plant fiber reinforced material is: soaking the sisal fiber in a sodium hydroxide solution with a mass fraction of 3%-5% for 2-3 hours, then rinsing with clean water until neutral, and then drying in an oven at 80-100°C for 3-4 hours, and finally cutting the dried sisal fiber into a length of 2-5 cm for standby use.

[0013] Furthermore, the neem bark extract is prepared by ethanol reflux extraction: the neem bark is crushed to 30-50 meshes, 6-8 times of 95% ethanol is added, reflux extraction is performed at 75-85°C for 2-3 times, each time for 1.5-2.5 hours, the extracts are combined, and the extracts are concentrated under reduced pressure to obtain the extract.

[0014] Furthermore, the calamus rhizome extract is extracted by ultrasound-assisted extraction: after the calamus rhizome is crushed, 5-7 times the amount of water is added, and ultrasonic extraction is performed for 30-45 minutes at a power of 200-300W and a temperature of 40-50°C, and the filtrate is collected after filtering and concentrated to obtain the extract.

[0015] Furthermore, the method for preparing the diaphragm-free casting integrated interior wall material comprises the following steps:

[0016] Raw material pretreatment: pretreat the inorganic gelling material, plant fiber reinforcement material and plant-derived preservative component according to the method described above;

[0017] Preliminary mixing: Add the pretreated inorganic gelling material, lightweight aggregate and additives into a forced mixer and stir at a speed of 400-600 rpm for 10-15 minutes to achieve preliminary mixing;

[0018] Adding plant fiber and preservative ingredients: Add the pretreated sisal fiber, neem bark extract and calamus rhizome extract to the above mixed system, and continue stirring at a speed of 300-500 rpm for 15-20 minutes to ensure that the ingredients are evenly dispersed;

[0019] Casting and molding: Pour the mixed materials directly into the pre-prepared wall mold, vibrate with a vibrating rod for 1-2 minutes to expel the bubbles in the materials, and then carry out natural curing or steam curing. The natural curing time is 7-10 days, the steam curing temperature is 60-80℃, and the curing time is 2-3 days. After the curing is completed, demoulding is carried out to obtain a diaphragm-free cast-integrated interior wall material.

[0020] Furthermore, functional pigments can be added, such as environmentally friendly inorganic pigments such as red iron oxide and yellow iron oxide, etc., with an addition amount of 0.5-2 parts, and the color of the interior wall material can be adjusted as needed to meet different indoor decoration needs, pyrethrum extract and lavender extract. The addition amount of the pyrethrum extract is 1.2-1.5 parts, and the addition amount of the lavender extract is 0.8-1 parts and 0-4 parts respectively. The modified nano-silica-polysiloxane composite emulsion is prepared by the following method: first, the nano-silica is immersed in a 5% aminosilane coupling agent ethanol solution for 4 hours, and dried in an oven at 110°C for 3 hours to graft aminosilane on its surface; then, the grafted nano-silica is mixed with the polysiloxane emulsion in a mass ratio of 1:3, and dispersed for 25 minutes under ultrasonic conditions of 40°C and 300W.

[0021] Beneficial effects:

[0022] Sulphoaluminate cement and metakaolin in inorganic cementitious materials work together. Sulphoaluminate cement hardens quickly, has high early strength, and has certain fire resistance. During the cement hydration process, metakaolin can undergo secondary reactions to generate more gel substances, which not only enhances the strength of the material, but also further improves the fire resistance. After the two are mixed and evenly dispersed, they provide a solid basic framework for the overall material.

[0023] Plant fiber reinforcement materials use specially pretreated sisal fibers. Sisal fibers themselves have high strength. After being treated with sodium hydroxide solution, impurities on the fiber surface are removed, the roughness is increased, and the bonding force with inorganic gelling materials is enhanced. In the material, sisal fibers are evenly distributed in the matrix like steel bars, effectively preventing the generation and expansion of cracks, thereby significantly improving the tensile strength and bending strength of the material.

[0024] Neem bark extract and calamus rhizome extract are plant-based preservative ingredients, which are rich in a variety of natural antibacterial and preservative substances. These substances can destroy the cell walls and cell membranes of microorganisms, inhibit the growth and reproduction of microorganisms, and thus effectively prevent the material from being damaged by microbial erosion during use, thereby extending the service life of the material. Pyrethrum extract and lavender extract give the material an insect repellent function. The pyrethrin in pyrethrum and the volatile oil components in lavender can stimulate the nervous system of mosquitoes, interfere with their normal physiological activities, keep mosquitoes away from the area where the material is located, and create a relatively mosquito-free environment indoors.

[0025] Lightweight aggregate expanded perlite and closed-cell vitrified microspheres have low density and can effectively reduce the overall density of the material, reduce the weight of the wall, and facilitate construction. At the same time, their porous structure can effectively block the propagation of sound and improve the sound insulation performance of the material. The modified nano-silica-polysiloxane composite emulsion is the key to improving waterproof performance. After being treated with an aminosilane coupling agent, the surface activity of nano-silica is enhanced. After mixing with the polysiloxane emulsion, the two form a tightly bound structure. Polysiloxane itself has low surface energy and good waterproof properties, and nano-silica plays a role in strengthening and uniformly dispersing it, forming a dense waterproof film inside and on the surface of the material, greatly reducing the water absorption rate of the material, increasing the contact angle, achieving a good waterproof effect, and being well compatible with other components without affecting the original performance.

[0026] During the preparation process, the stirring speed and time of each stage are precisely controlled to ensure that the components are evenly dispersed and their performance advantages are fully utilized. The setting of steam curing conditions also promotes the hardening and performance stability of the material, ultimately making the interior wall material synergistically effective in fire prevention, corrosion prevention, mechanics, sound insulation, insect repellent and waterproofing, which is superior to existing technologies. DETAILED DESCRIPTION

[0027] Embodiment 1

[0028] Formula composition: 45 parts of sulphoaluminate cement, 12 parts of metakaolin, 6 parts of pretreated sisal fiber, 3 parts of neem bark extract, 2 parts of calamus rhizome extract, 10 parts of expanded perlite, 8 parts of closed-cell vitrified microspheres, 0.3 parts of polycarboxylic acid water reducer, 0.2 parts of sodium gluconate, and 0.08 parts of sodium lauryl sulfate.

[0029] Preparation method:

[0030] The raw materials are pretreated according to the method in the above invention.

[0031] The pretreated inorganic gelling material, lightweight aggregate and additives were added into a forced mixer and stirred at a speed of 500 rpm for 12 minutes.

[0032] The pretreated sisal fiber, neem bark extract and calamus rhizome extract were added and the mixture was stirred at 400 rpm for 18 minutes.

[0033] Pour the mixed material into the wall mold, vibrate with a vibrating rod for 1.5 minutes, and then carry out natural curing for 8 days, and demould to obtain the interior wall material.

[0034] Performance Test:

[0035] Fireproof performance: Tested according to GB / T5464-2010 standard, the fire resistance limit of the material reaches 2.5 hours.

[0036] Anti-corrosion performance: Tested in accordance with GB / T1741-2020 standard, after 120 days of artificial accelerated aging test, there was no obvious mold growth and corrosion on the surface of the material.

[0037] Mechanical properties: tensile strength is 4.5MPa, flexural strength is 6.8MPa.

[0038] Sound insulation performance: tested according to GB / T19889.3-2005 standard, the sound insulation performance of the material reaches 40dB.

[0039] Density: The density of the material is 1200kg / m 3 .

[0040] Embodiment 2

[0041] Formula composition: 42 parts of sulphoaluminate cement, 13 parts of metakaolin, 7 parts of pretreated sisal fiber, 2.5 parts of neem bark extract, 2.5 parts of calamus rhizome extract, 9 parts of expanded perlite, 7 parts of closed-cell vitrified microspheres, 0.4 parts of polycarboxylic acid water reducer, 0.25 parts of sodium gluconate, 0.06 parts of sodium dodecyl sulfate, and 1 part of red iron oxide.

[0042] Preparation method:

[0043] The pretreatment of each raw material is the same as in Example 1.

[0044] The stirring speed and time for preliminary mixing and adding plant fiber and preservative ingredients were adjusted to 450 rpm for 13 minutes and 350 rpm for 16 minutes, respectively.

[0045] Steam curing was adopted, the temperature was 70° C., the curing time was 2.5 days, and the other steps were the same as those in Example 1.

[0046] Performance Test:

[0047] Fire resistance: The fire resistance limit reaches 2.3 hours.

[0048] Anti-corrosion performance: After 100 days of artificial accelerated aging test, there is only slight discoloration on the surface of the material, and no obvious corrosion and mold growth.

[0049] Mechanical properties: tensile strength is 4.2MPa, flexural strength is 6.5MPa.

[0050] Sound insulation performance: The sound insulation reaches 38dB.

[0051] Density: 1150kg / m 3 , and the material presents a uniform red color, meeting the decorative needs.

[0052] Comparative Example 1: Lack of plant-derived preservative ingredients

[0053] Formula composition: 45 parts of sulphoaluminate cement, 12 parts of metakaolin, 6 parts of pretreated sisal fiber, 10 parts of expanded perlite, 8 parts of closed-cell vitrified microspheres, 0.3 parts of polycarboxylic acid water reducer, 0.2 parts of sodium gluconate, and 0.08 parts of sodium lauryl sulfate.

[0054] Preparation method: Same as Example 1.

[0055] Performance Test:

[0056] Anticorrosion performance: According to the GB / T1741-2020 standard, after 60 days of artificial accelerated aging test, obvious mold growth and corrosion spots appeared on the surface of the material. Compared with Example 1, the anticorrosion performance of the material lacking plant-derived anticorrosive ingredients was significantly reduced, indicating that the neem bark extract and the calamus rhizome extract played a key role in improving the anticorrosion performance of the material.

[0057] Comparative Example 2: Untreated sisal fiber

[0058] Formula composition: 45 parts of sulphoaluminate cement, 12 parts of metakaolin, 6 parts of untreated sisal fiber, 3 parts of neem bark extract, 2 parts of calamus rhizome extract, 10 parts of expanded perlite, 8 parts of closed-cell vitrified microspheres, 0.3 parts of polycarboxylic acid water reducer, 0.2 parts of sodium gluconate, and 0.08 parts of sodium lauryl sulfate.

[0059] Preparation method: Same as Example 1.

[0060] Performance Test:

[0061] Mechanical properties: tensile strength is 3.2 MPa, flexural strength is 5.0 MPa. Compared with Example 1, the mechanical properties of the material using untreated sisal fiber are significantly reduced, indicating that pretreatment of sisal fiber can effectively improve its bonding force with inorganic gelling materials, thereby enhancing the mechanical properties of the material.

[0062] Embodiment 3

[0063] Formula composition: 48 parts of sulphoaluminate cement, 14 parts of metakaolin, 7 parts of pretreated sisal fiber, 3.5 parts of neem bark extract, 2.5 parts of calamus rhizome extract, 11 parts of expanded perlite, 9 parts of closed-cell vitrified microspheres, 0.4 parts of polycarboxylic acid water reducer, 0.25 parts of sodium gluconate, 0.07 parts of sodium dodecyl sulfate, 5 parts of new flame retardant compound, and 1.5 parts of yellow iron oxide.

[0064] Design principles of new flame retardant compounds:

[0065] The novel flame retardant compound used in this embodiment is a phosphorus-nitrogen-boron synergistic flame retardant, which is based on pentaerythritol phosphate melamine salt (PMP) and synthesized by chemical grafting borate (BOR). PMP itself has a good phosphorus-nitrogen synergistic flame retardant effect. When heated, phosphorus can promote the formation of a dense carbon layer on the surface of the material, and nitrogen decomposes to produce non-combustible gas, diluting the concentration of oxygen and combustible gas.

[0066] The introduction of boric acid ester further optimizes the flame retardant performance. Boron can form a glassy protective film at high temperatures, covering the surface of the material, which can not only prevent heat transfer, but also isolate oxygen, and promote the stability of the carbon layer. In addition, boric acid ester and PMP are connected by chemical bonds, which enhances the interaction between molecules, making the flame retardant more evenly dispersed in the material and improving the flame retardant efficiency.

[0067] Preparation method:

[0068] The raw material pretreatment steps are the same as in Example 1.

[0069] The pretreated inorganic gelling material, lightweight aggregate and additives were added into a forced mixer and stirred at a speed of 550 rpm for 14 minutes.

[0070] The pretreated sisal fiber, neem bark extract, calamus rhizome extract and novel flame retardant compound were added and stirred at 450 rpm for 20 minutes.

[0071] After adding the yellow iron oxide, stir for another 5 minutes to ensure that the pigment is evenly dispersed.

[0072] Pour the mixed material into the wall mold, vibrate with a vibrating rod for 1.5 minutes, and then use steam curing at a temperature of 75°C for 2.5 days. After curing, demould the mold to obtain the interior wall material.

[0073] Performance Test:

[0074] Fire resistance: According to the GB / T5464-2010 standard, the fire resistance limit of the material reaches 3.0 hours, which is significantly improved compared with Example 1 and Example 2, proving that the new flame retardant compound effectively enhances the fire resistance.

[0075] Anti-corrosion performance: Tested in accordance with GB / T1741-2020 standard, after 120 days of artificial accelerated aging test, there was no obvious mold growth and corrosion on the surface of the material, and the anti-corrosion performance was still good, indicating that the addition of new flame retardant compounds did not have a negative impact on the anti-corrosion performance.

[0076] Mechanical properties: The tensile strength is 4.6 MPa, and the flexural strength is 7.0 MPa. The mechanical properties are comparable to those of Example 1 and Example 2, indicating that the new flame retardant compound does not reduce the mechanical strength of the material while improving the fire resistance.

[0077] Sound insulation performance: tested according to GB / T19889.3-2005 standard, the sound insulation performance of the material reaches 42dB, and the sound insulation effect is slightly improved. This may be because the molecular structure of the new flame retardant compound helps to block the sound.

[0078] Density: The density of the material is 1220kg / m 3 , the density has increased slightly, but it is still within an acceptable range and does not affect practical use.

[0079] Flame retardant synergistic analysis: By comparing with Example 1 and Example 2, under the same test conditions, the fire resistance limit of Example 3 with the addition of the new flame retardant compound is significantly extended. This is because the three elements of phosphorus, nitrogen and boron in the phosphorus-nitrogen-boron synergistic flame retardant play a role at different stages, forming a more complete flame retardant system. The phosphorus element promotes carbonization, the nitrogen element dilutes the combustible gas, and the boron element forms a protective film. The three work synergistically to effectively prevent the transfer of heat and oxygen, thereby significantly improving the flame retardant properties of the material.

[0080] Embodiment 4

[0081] Formula composition: 48 parts of sulphoaluminate cement, 14 parts of metakaolin, 8 parts of pretreated sisal fiber, 4 parts of neem bark extract, 3 parts of calamus rhizome extract, 12 parts of expanded perlite, 10 parts of closed-cell vitrified microspheres, 0.5 parts of polycarboxylic acid water reducer, 0.3 parts of sodium gluconate, 0.1 parts of sodium dodecyl sulfate, and 2 parts of yellow iron oxide.

[0082] Preparation method:

[0083] Pre-treat each raw material according to the established method.

[0084] The pretreated inorganic gelling material, lightweight aggregate and additives are added into a forced mixer and stirred at a speed of 600 rpm for 15 minutes.

[0085] The pretreated sisal fiber, neem bark extract and calamus rhizome extract were added and the mixture was stirred at 500 rpm for 20 minutes.

[0086] Pour the mixed material into the wall mold, vibrate with a vibrating rod for 2 minutes, use steam curing at a temperature of 80°C for 3 days, and demould to obtain the interior wall material.

[0087] Performance Test:

[0088] Fireproof performance: Tested according to GB / T5464-2010 standard, the fire resistance limit of the material reaches 2.8 hours.

[0089] Anti-corrosion performance: Tested in accordance with GB / T1741-2020 standard, after 150 days of artificial accelerated aging test, there was no sign of mold growth and corrosion on the surface of the material.

[0090] Mechanical properties: tensile strength is 5.0MPa, flexural strength is 7.5MPa.

[0091] Sound insulation performance: tested according to GB / T19889.3-2005 standard, the sound insulation performance of the material reaches 42dB.

[0092] Density: The density of the material is 1250kg / m 3 , and it presents a uniform yellow color, with good decorative effect.

[0093] Comparative analysis of existing technologies

[0094] Traditional gypsum-based interior wall materials and organic polymer-based interior wall materials commonly found on the market were selected for comparison.

[0095] Traditional gypsum-based interior wall materials:

[0096] Composition: The main components are 70 parts of gypsum, 5 parts of fiber reinforcement material (ordinary wood fiber), and 5 parts of additives (retarders, etc.).

[0097] performance:

[0098] Fire resistance: Fire resistance limit is about 1.5 hours.

[0099] Anti-corrosion performance: In a humid environment, it will begin to become deformed and moldy on the surface after about 30 days.

[0100] Mechanical properties: tensile strength is about 2.0MPa, bending strength is about 3.5MPa.

[0101] Sound insulation performance: sound insulation is about 30dB.

[0102] Density: about 1500kg / m 3 .

[0103] Organic polymer-based interior wall materials:

[0104] Composition: 60 parts of organic polymer resin, 20 parts of filler (calcium carbonate, etc.), 5 parts of plasticizer, and 5 parts of flame retardant.

[0105] performance:

[0106] Fire resistance: Fire resistance limit is about 1.0 hour.

[0107] Anti-corrosion performance: basically no natural anti-corrosion ability, chemical preservatives need to be added.

[0108] Mechanical properties: tensile strength is about 3.0MPa, bending strength is about 4.0MPa.

[0109] Sound insulation performance: sound insulation is about 32dB.

[0110] Density: about 1300kg / m 3 .

[0111] Compared with traditional gypsum-based interior wall materials, the interior wall materials of the present invention have significantly improved fire resistance, corrosion resistance, mechanical properties and sound insulation performance, lower density, and natural corrosion resistance. Compared with organic polymer-based interior wall materials, the materials of the present invention have better fire resistance, are more environmentally friendly using plant-based antiseptic ingredients, and have obvious advantages in mechanical properties and sound insulation performance. The comparison fully demonstrates the excellent performance brought about by the synergistic enhancement of the formula components of the present invention.

[0112] Embodiment 5

[0113] Formula composition: 46 parts of sulphoaluminate cement, 13 parts of metakaolin, 7 parts of pretreated sisal fiber, 3 parts of neem bark extract, 2 parts of calamus rhizome extract, 1.5 parts of pyrethrum extract, 1 part of lavender extract, 11 parts of expanded perlite, 9 parts of closed-cell vitrified microspheres, 0.4 parts of polycarboxylic acid water reducer, 0.25 parts of sodium gluconate, 0.08 parts of sodium lauryl sulfate, and 1.5 parts of environmentally friendly inorganic pigment (titanium dioxide).

[0114] Preparation method:

[0115] The raw materials were pretreated according to the established methods in the previous embodiments. For the pyrethrum extract, the pyrethrum was crushed into 40-60 meshes by supercritical carbon dioxide extraction, and placed in a supercritical carbon dioxide extraction device, and carbon dioxide was used as an extractant under the conditions of pressure of 20-25MPa and temperature of 40-50°C, and the extraction time was 2-3 hours to obtain the lavender extract. The lavender was crushed by steam distillation, and an appropriate amount of water was added to perform steam distillation, and the distillate was collected and separated from oil and water to obtain the lavender extract.

[0116] The pretreated inorganic gelling material, lightweight aggregate and additives were added into a forced mixer and stirred at a speed of 550 rpm for 13 minutes.

[0117] The pretreated sisal fiber, neem bark extract, calamus rhizome extract, pyrethrum extract and lavender extract were added and the mixture was stirred at 450 rpm for 18 minutes.

[0118] The mixed material was poured into a wall mold, vibrated with a vibrating rod for 1.8 minutes, steam cured at 75°C for 2.5 days, and demoulded to obtain the interior wall material.

[0119] Performance Test:

[0120] Fireproof performance: Tested according to GB / T5464-2010 standard, the fire resistance limit of the material reaches 2.6 hours.

[0121] Anti-corrosion performance: Tested in accordance with GB / T1741-2020 standard, after 130 days of artificial accelerated aging test, there was no mold growth and corrosion on the surface of the material.

[0122] Mechanical properties: tensile strength is 4.8MPa, flexural strength is 7.2MPa.

[0123] Sound insulation performance: tested according to GB / T19889.3-2005 standard, the sound insulation performance of the material reaches 40dB.

[0124] Density: The density of the material is 1220kg / m 3 , and appears white, meeting the color requirements of interior decoration.

[0125] Insect repellent performance: In an indoor mosquito repellent experiment, in the same space, compared with ordinary interior wall materials, the number of mosquitoes around the material of this embodiment is reduced by 70%, indicating that it has a good insect repellent effect.

[0126] Compared with the previous embodiment, the present embodiment adds pyrethrum extract and lavender extract, which not only does not have a negative impact on the original fireproof, antiseptic, mechanical and sound insulation properties of the material, but also gives the material the function of repelling insects, further expanding the application scenarios of the material, and reflecting the good synergistic effect between the various plant-derived ingredients. At the same time, compared with the prior art, the material of this embodiment has the unique property of repelling insects on the basis of other advantages, and the advantages are more obvious.

[0127] Embodiment 6

[0128] Formula composition: 44 parts of sulphoaluminate cement, 14 parts of metakaolin, 6.5 parts of pretreated sisal fiber, 2.5 parts of neem bark extract, 2.5 parts of calamus rhizome extract, 1.2 parts of pyrethrum extract, 0.8 parts of lavender extract, 10 parts of expanded perlite, 8 parts of closed-cell vitrified microspheres, 0.35 parts of polycarboxylic acid water reducer, 0.22 parts of sodium gluconate, 0.07 parts of sodium dodecyl sulfate, 1.3 parts of environmentally friendly inorganic pigment (chromium oxide green), and 4 parts of modified nano-silica-polysiloxane composite emulsion.

[0129] Preparation method:

[0130] The pretreatment method of pyrethrum extract, lavender extract and other raw materials is the same as that of Example 4. Preparation method of modified nano-silica-polysiloxane composite emulsion: first, nano-silica is soaked in 5% aminosilane coupling agent ethanol solution for 4 hours, and dried in an oven at 110°C for 3 hours to graft aminosilane on its surface; then the grafted nano-silica is mixed with polysiloxane emulsion in a mass ratio of 1:3, and dispersed at 40°C and 300W ultrasonic conditions for 25 minutes to obtain a composite emulsion.

[0131] The pretreated inorganic gelling material, lightweight aggregate and additives were added into a forced mixer and stirred at a speed of 500 rpm for 12 minutes.

[0132] The pretreated sisal fiber, neem bark extract, calamus rhizome extract, pyrethrum extract and lavender extract were added, and stirring was continued at 400 rpm for 16 minutes.

[0133] Add the modified nano-silica-polysiloxane composite emulsion and stir at a speed of 450 rpm for 20 minutes.

[0134] The mixed material was poured into a wall mold, vibrated with a vibrating rod for 1.6 minutes, steam cured at a temperature of 72°C for 2.2 days, and demoulded to obtain the interior wall material.

[0135] Performance Test:

[0136] Fireproof performance: According to the GB / T5464-2010 standard test, the fire resistance limit of the material reaches 2.5 hours.

[0137] Anti-corrosion performance: Tested in accordance with GB / T1741-2020 standard, after 120 days of artificial accelerated aging test, there is no mold growth and corrosion on the surface of the material.

[0138] Mechanical properties: tensile strength is 4.6MPa, flexural strength is 7.0MPa.

[0139] Sound insulation performance: According to the GB / T19889.3-2005 standard test, the sound insulation performance of the material reaches 39dB.

[0140] Density: The density of the material is 1200kg / m 3 , showing green, meeting the color needs of interior decoration.

[0141] Waterproof performance: In the static water absorption test, the material was immersed in water for 24 hours, and the water absorption rate was only 3%; in the contact angle test, the contact angle of water on the material surface reached 130°, indicating good waterproof performance.

[0142] Compared with the previous embodiment, the modified nano-silicon dioxide-polysiloxane composite emulsion added in this embodiment significantly improves the waterproof performance on the basis of ensuring the original fireproof, anticorrosive, mechanical, sound insulation and insect repellent properties of the material, further enhances the applicability of the material in a humid environment, and reflects the good synergistic effect of the waterproof component and other components. Compared with the prior art, the material of this embodiment is more outstanding in terms of comprehensive functions and superior performance.

Claims

1. A non-diaphragm casting integrated interior wall material, characterized in that: The formula includes: Inorganic cementitious materials: 40-50 parts of sulphoaluminate cement, 10-15 parts of metakaolin; Plant fiber reinforcement material: 5-8 parts of pretreated sisal fiber; Plant-derived preservative ingredients: 2-4 parts of neem bark extract, 1-3 parts of calamus rhizome extract; Lightweight aggregate: 8-12 parts of expanded perlite, 5-10 parts of closed-cell vitrified microspheres; Additives: polycarboxylic acid water reducer 0.2-0.5 parts, retarder sodium gluconate 0.1-0.3 parts, air entraining agent sodium dodecyl sulfate 0.05-0.1 parts.

2. The membrane-free casting integrated interior wall material according to claim 1 is characterized in that: In the inorganic gelling material, sulphoaluminate cement and metakaolin are mixed in a high-speed mixer at a speed of 600-800 rpm for 10-15 minutes to make them fully and evenly dispersed.

3. The membrane-free casting integrated interior wall material according to claim 1, characterized in that: The pretreatment method of the plant fiber reinforced material is as follows: immersing the sisal fiber in a sodium hydroxide solution with a mass fraction of 3%-5% for 2-3 hours, then washing with clean water until neutral, drying in an oven at 80-100°C for 3-4 hours, and finally cutting the dried sisal fiber into a length of 2-5 cm for standby use.

4. The membrane-free casting integrated interior wall material according to claim 1, characterized in that: The neem bark extract is prepared by an ethanol reflux extraction method: the neem bark is crushed to 30-50 meshes, 6-8 times of 95% ethanol is added, reflux extraction is performed at 75-85°C for 2-3 times, each time for 1.5-2.5 hours, the extracts are combined, and the extracts are concentrated under reduced pressure to obtain the extract.

5. The membrane-free casting integrated interior wall material according to claim 1, characterized in that: The calamus rhizome extract is prepared by ultrasonic-assisted extraction: the calamus rhizome is crushed, 5-7 times of water is added, ultrasonic extraction is performed for 30-45 minutes at a power of 200-300W and a temperature of 40-50°C, and the filtrate is collected after filtering and concentrated to obtain the extract.

6. A method for preparing the diaphragm-free casting integrated interior wall material as claimed in claim 1, characterized in that: The following steps are involved: Raw material pretreatment: pretreating the inorganic gelling material, plant fiber reinforcement material, and plant-derived preservative component according to the method described in any one of claims 2 to 5; Preliminary mixing: Add the pretreated inorganic gelling material, lightweight aggregate and additives into a forced mixer and stir at a speed of 400-600 rpm for 10-15 minutes to achieve preliminary mixing; Adding plant fiber and preservative ingredients: Add the pretreated sisal fiber, neem bark extract and calamus rhizome extract to the above mixed system, and continue stirring at a speed of 300-500 rpm for 15-20 minutes to ensure that the ingredients are evenly dispersed; Casting and molding: Pour the mixed materials directly into the pre-prepared wall mold, vibrate with a vibrating rod for 1-2 minutes to expel the bubbles in the materials, and then carry out natural curing or steam curing. The natural curing time is 7-10 days, the steam curing temperature is 60-80℃, and the curing time is 2-3 days. After the curing is completed, demoulding is carried out to obtain a diaphragm-free cast-integrated interior wall material.

7. The membrane-free cast-integrated interior wall material according to claim 1, characterized in that: Environmentally friendly inorganic pigments such as red iron oxide and yellow iron oxide can also be added in an amount of 0.5-2 parts, pyrethrum extract and lavender extract, wherein the pyrethrum extract is added in an amount of 1.2-1.5 parts, the lavender extract is added in an amount of 0.8-1 parts and 0-4 parts respectively. A modified nano-silica-polysiloxane composite emulsion is prepared by the following method: firstly, the nano-silica is soaked in a 5% aminosilane coupling agent ethanol solution for 4 hours, and then dried in an oven at 110°C for 3 hours to graft aminosilane on its surface; then, the grafted nano-silica is mixed with the polysiloxane emulsion in a mass ratio of 1:3, and dispersed for 25 minutes under ultrasonic conditions of 40°C and 300W.