Palm fiber-containing thermal insulation wall material and wall printing method

Abstract

The invention relates to the technical field of novel wall materials, in particular to a palm fiber-containing thermal insulation wall material and a wall printing method. The palm fiber-containing thermal insulation wall material is prepared from the following raw materials in parts by mass: 400 to 600 parts of sulphoaluminate cement, 5 to 12 parts of beta-type semi-hydrated gypsum, 80 to 120 parts of activated palm fiber, 400 to 500 parts of fine aggregate, 100 to 200 parts of closed cell perlite, 10 to 20 parts of water reducing agent, 0.1 to 0.5 part of retarder, 1 to 5 parts of cellulose ether, 10 to 30 parts of dispersible latex powder and 0.1 to 1 part of defoaming agent. The raw material components and the proportion are optimally designed, so that on one hand, the waterproof and anti-permeability performance of the mortar can be improved, and the requirements of a thermal insulation wall on the waterproof, anti-permeability and strength performance are met; on the other hand, the flowing property of the mortar can be effectively improved, rapid curing and controllability of the mortar are achieved, and then the use requirement for 3D printing buildings is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new wall materials, and particularly relates to a palm fiber-containing thermal insulation wall material and a wall printing method. BACKGROUND

[0002] In recent years, China's building energy-saving policy continues to deepen, and new wall materials and 3D printing technology have become the focus of industry innovation. Traditional self-insulation blocks are facing elimination due to defects such as high energy consumption and long construction period, while 3D printing concrete technology is developing rapidly due to its advantages such as efficient construction and controllable cost.

[0003] However, the 3D printing mortar as the core material still has three technical bottlenecks: (1) Insufficient fluidity leads to low construction efficiency: existing mortar is prone to segregation and pipe blockage during pumping, especially when fiber reinforced materials are added, the viscosity of the system increases sharply, and the rheological properties of the mortar output by the printing head are unstable, which leads to poor interlayer adhesion, directly affecting the integrity and construction accuracy of the building structure.

[0004] (2) It is difficult to balance the gel time and solidification rate: ideal mortar needs to be quickly shaped after extrusion while maintaining sufficient operation window; but existing formulations often face the dilemma of "fast setting and easy blockage" and "slow setting and insufficient strength", which cannot meet the continuous printing needs of complex structures.

[0005] (3) Large dispersion of mechanical strength after solidification: the traditional mortar has a 28-day compressive strength fluctuation range of 20%, and the insufficient interfacial adhesion strength leads to interlayer weakening; although the use of fiber reinforcement can improve the toughness, the fiber-matrix interface defects easily cause stress concentration, causing the risk of early cracking of the printed wall.

[0006] At present, how to realize the breakthrough of the fluidity, controllable solidification and strength stability of the mortar provides material support for the industrialization of 3D printing building industry, which has excellent research prospects. SUMMARY

[0007] The present application relates to the technical field of new wall materials, and particularly relates to a palm fiber-containing thermal insulation wall material and a wall printing method.

[0008] A palm fiber-containing thermal insulation wall material, the raw materials of which include, in terms of mass parts: 400-600 parts of sulphoaluminate cement, 5-12 parts of beta-type hemihydrate gypsum, 80-120 parts of activated palm fiber, 400-500 parts of fine aggregate, 100-200 parts of closed-cell perlite, 10-20 parts of water reducing agent, 0.1-0.5 parts of retarder, 1-5 parts of cellulose ether, 10-30 parts of dispersible latex powder, 0.1-1 parts of defoaming agent, and 140-240 parts of water.

[0009] Preferably, the fine aggregate comprises: standard sand with a particle size of 0.1-0.6mm, carborundum with a particle size of 0.6-1.2mm, and the mass ratio of the standard sand to the carborundum is 1-2:1-2.

[0010] Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.

[0011] Preferably, the retarder is selected from sodium gluconate and / or boric acid.

[0012] Preferably, the cellulose ether is hydroxypropyl methyl cellulose.

[0013] Preferably, the dispersible latex powder is ethylene-vinyl acetate copolymer.

[0014] Preferably, the activated palm fiber is prepared by the following specific operation: adding hexamethyldisilazane into an aqueous ethanol solution to obtain a pre-dispersed hexamethyldisilazane; adding palm fiber into the aqueous ethanol solution, adding tetraethyl orthosilicate and ultrasonic treatment for 1-2h, cooling to 1-5℃, adjusting the pH value of the system to 5-6, continuing ultrasonic treatment for 1-3h, adding the pre-dispersed hexamethyldisilazane dropwise under stirring, continuing stirring for 10-20h after the dropwise addition is completed, filtering, washing, and vacuum drying.

[0015] More preferably, the mass ratio of the hexamethyldisilazane, the palm fiber, and the tetraethyl orthosilicate is 1-2:5-15:1-5.

[0016] More preferably, the palm fiber comprises palm fibers with lengths of 3-10mm, 10-15mm, and 16-20mm, respectively; and the mass ratio of the palm fibers with lengths of 3-10mm, 10-15mm, and 16-20mm is 1-2:1-2:1.

[0017] The preparation method of the palm fiber-containing thermal insulation wall material described above comprises the following steps: S1, dry mixing the sulfoaluminate cement, the fine aggregate, and the closed-cell perlite for 1-3min, adding the activated palm fiber and the β-type hemihydrate gypsum to continue stirring for 1-5min to obtain a premix a; S2, adding the water reducing agent, the retarder, the cellulose ether, the dispersible latex powder, and the defoaming agent into water to stir uniformly to obtain a premix b; S3, stirring the premix a and the premix b uniformly.

[0018] A wall printing method, the palm fiber-containing thermal insulation wall material described above is pumped into a 3D printing system, and 3D printing is performed according to a required building structure. Advantages

[0019] The present application takes sulphoaluminate cement as base material, cooperates water reducing agent and cellulose ether to form steric hindrance effect in the system, effectively reduces the friction between the hydration particles, cooperates with beta type semi-hydrated gypsum to effectively delay the early hydration of aluminate phase, avoids the viscosity of slurry increasing suddenly, the fine aggregate of grading ratio forms a close packing system, and the closed pore perlite improves the porosity of the system, so that the thermal insulation performance is ensured, and the two are compounded to make the mortar maintain good pumping fluidity under the action of shear thinning, and effectively solve the problem of segregation and pipe blockage.

[0020] The present application utilizes the synergistic effect of retarder and beta type semi-hydrated gypsum, inhibits the early hydration reaction of sulphate minerals, prolongs the operable time of slurry, at the same time, the surface silicon hydroxyl of palm fiber modified by hexamethyldisilazane reacts with cement hydration products to generate hydrated calcium silicate gel, which forms a local slow-release effect under the adsorption of the porous structure of the fiber, realizes the precise control of initial setting and final setting time, and ensures that the mortar is quickly shaped after extrusion and keeps the interlayer continuity.

[0021] The present application utilizes the hydrated calcium silicate generated by activated palm fiber to improve the adhesion of the fiber and the matrix interface, significantly enhances the toughness of the wall material, and uses hexamethyldisilazane in-situ modification, significantly improves the waterproof and impermeable performance of the material on the basis of meeting the mechanical strength, and cooperates with sulphoaluminate cement to ensure the best cooperation of its waterproof performance and mechanical strength.

[0022] The present application optimizes the design of raw material components and ratio, on the one hand, can improve the waterproof and impermeable performance of the mortar, meet the demand of waterproof and impermeable and strength performance of the thermal insulation wall, make the waterproof effect and mechanical strength reach the best cooperation, on the other hand, can effectively improve the flow performance of the mortar, realize the rapid curing and controllable of the mortar, and further meet the use demand of 3D printing building. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The flow degree, final setting time comparison chart of the thermal insulation wall material obtained from example 5 and comparative examples 1-2.

[0024] Figure 2 The compressive strength comparison chart of the thermal insulation wall material obtained from example 5 and comparative examples 1-2.

[0025] Figure 3 The flexural strength comparison chart of the thermal insulation wall material obtained from example 5 and comparative examples 1-2.

[0026] Figure 4 The thermal conductivity, 28d impermeable pressure comparison chart of the thermal insulation wall material obtained from example 5 and comparative examples 1-2. DETAILED DESCRIPTION

[0027] The application will be further described below with reference to specific examples.

[0028] The fine aggregate used below is composed of standard sand with a particle size of 0.1-0.6 mm and corundum with a particle size of 0.6-1.2 mm at a mass ratio of 2:1. The hydroxypropyl methyl cellulose used below is purchased from a certain Hebei Shuo Chemical Co., Ltd. The polycarboxylate superplasticizer used below is purchased from a certain Shandong Ronghua Chemical Technology Co., Ltd. The redispersible latex powder used below is purchased from a certain Nanjing Haixin Material Technology Co., Ltd., and the model is HS-760. The defoaming agent used below is purchased from a certain Nanjing Haixin Material Technology Co., Ltd., and the model is NATEB-328F. The palm fiber used below is composed of palm fiber with a length of 3-10 mm, palm fiber with a length of 10-15 mm, and palm fiber with a length of 16-20 mm at a mass ratio of 3:3:2.

[0029] Example 1: A palm fiber-containing thermal insulation wall material, the raw materials of which include: R•SAC 42.5-grade sulphoaluminate cement 400 g, β-type hemihydrate gypsum 5 g, activated palm fiber 80 g, fine aggregate 400 g, closed-cell perlite 100 g, polycarboxylate superplasticizer 10 g, boric acid 0.1 g, hydroxypropyl methyl cellulose 1 g, dispersible latex powder 10 g, defoaming agent 0.1 g, and water 140 g.

[0030] The activated palm fiber is prepared by the following specific operation: 1 g of hexamethyldisilazane is added to 10 g of 60% mass fraction ethanol aqueous solution and stirred uniformly to obtain pre-dispersed hexamethyldisilazane; 5 g of palm fiber is added to 40 g of 40% mass fraction ethanol aqueous solution, 1 g of tetraethyl orthosilicate is added, ultrasonic treatment is performed for 1 h, the ultrasonic frequency is 50 kHz, the temperature is reduced to 1℃, the pH value of the system is adjusted to 5-6 by using 0.1 mol / L hydrochloric acid, and then ultrasonic treatment is continued for 1 h; the pre-dispersed hexamethyldisilazane is added dropwise in a stirring state, stirring is continued for 10 h after the dropwise addition is completed, and then filtration, washing, and vacuum drying are performed.

[0031] The preparation method of the palm fiber-containing thermal insulation wall material described above includes the following steps: S1, R•SAC 42.5-grade sulphoaluminate cement, fine aggregate, and closed-cell perlite are dry-mixed for 1 min at a dry-mixing speed of 400 r / min, activated palm fiber and β-type hemihydrate gypsum are added and stirred for 1 min, and a premix a is obtained; S2, polycarboxylate superplasticizer, boric acid, hydroxypropyl methyl cellulose, dispersible latex powder, and defoaming agent are added to water and stirred uniformly to obtain a premix b; S3, the premix a and the premix b are stirred uniformly.

[0032] Example 2: A palm fiber-containing thermal insulation wall material, the raw materials of which include: R•SAC 42.5 grade sulphoaluminate cement 600 g, β-type hemihydrate gypsum 12 g, activated palm fiber 120 g, fine aggregate 500 g, closed-cell perlite 200 g, polycarboxylate superplasticizer 20 g, boric acid 0.5 g, hydroxypropyl methyl cellulose 5 g, dispersible latex powder 30 g, defoaming agent 1 g, and water 240 g.

[0033] The activated palm fiber is prepared by the following specific operation: 2 g of hexamethyldisilazane is added to 30 g of 70% mass fraction ethanol aqueous solution and stirred to obtain a pre-dispersed hexamethyldisilazane; 15 g of palm fiber is added to 60 g of 60% mass fraction ethanol aqueous solution, 5 g of tetraethyl orthosilicate is added, and ultrasonic treatment is performed for 2 h at an ultrasonic frequency of 70 kHz, the temperature is reduced to 5℃, the pH value of the system is adjusted to 5-6 by using 0.5 mol / L hydrochloric acid, and the ultrasonic treatment is continued for 3 h, the pre-dispersed hexamethyldisilazane is added dropwise under stirring, and after the dropwise addition is completed, the stirring is continued for 20 h, and then filtration, washing, and vacuum drying are performed.

[0034] The preparation method of the palm fiber-containing thermal insulation wall material described above comprises the following steps: S1, R•SAC 42.5 grade sulphoaluminate cement, fine aggregate, and closed-cell perlite are dry-mixed for 3 min at a dry-mixing speed of 500 r / min, activated palm fiber and β-type hemihydrate gypsum are added and stirred for 5 min to obtain a premix a; S2, polycarboxylate superplasticizer, boric acid, hydroxypropyl methyl cellulose, dispersible latex powder, and defoaming agent are added to water and stirred to obtain a premix b; S3, the premix a and the premix b are stirred uniformly.

[0035] Example 3: A palm fiber-containing thermal insulation wall material, the raw materials of which include: R•SAC 42.5 grade sulphoaluminate cement 450 g, β-type hemihydrate gypsum 10 g, activated palm fiber 90 g, fine aggregate 480 g, closed-cell perlite 120 g, polycarboxylate superplasticizer 18 g, sodium gluconate 0.2 g, hydroxypropyl methyl cellulose 4 g, dispersible latex powder 15 g, defoaming agent 0.7 g, and water 180 g.

[0036] The activated palm fiber is prepared by the following specific operation: 1.8 g of hexamethyldisilazane is added to 15 g of 68% mass fraction ethanol aqueous solution to obtain a pre-dispersed hexamethyldisilazane; 8 g of palm fiber is added to 55 g of 45% mass fraction ethanol aqueous solution, 4 g of tetraethyl orthosilicate is added, and ultrasonic treatment is performed for 80 min, the ultrasonic frequency is 65 kHz, the temperature is reduced to 2 ℃, the pH value of the system is adjusted to 5-6 by using 0.4 mol / L hydrochloric acid, and the ultrasonic treatment is continued for 1.5 h; the pre-dispersed hexamethyldisilazane is added dropwise under stirring, and after the dropwise addition is completed, the stirring is continued for 18 h, and then filtration, washing and vacuum drying are performed.

[0037] The preparation method of the palm fiber-containing thermal insulation wall material described above comprises the following steps: S1, R•SAC 42.5 grade sulphoaluminate cement, fine aggregate and closed-cell perlite are dry mixed for 2 min at a dry mixing speed of 420 r / min, activated palm fiber and β-type hemihydrate gypsum are added and stirred for 4 min to obtain a premix a; S2, polycarboxylic acid water reducer, sodium gluconate, hydroxypropyl methyl cellulose, dispersible latex powder and defoaming agent are added to water and stirred to obtain a premix b; S3, the premix a and the premix b are stirred uniformly.

[0038] Example 4: A palm fiber-containing thermal insulation wall material, the raw materials of which include: R•SAC 42.5 grade sulphoaluminate cement 550 g, β-type hemihydrate gypsum 6 g, activated palm fiber 110 g, fine aggregate 420 g, closed-cell perlite 180 g, polycarboxylic acid water reducer 12 g, sodium gluconate 0.4 g, hydroxypropyl methyl cellulose 2 g, dispersible latex powder 25 g, defoaming agent 0.3 g, and water 200 g.

[0039] The activated palm fiber is prepared by the following specific operation: 1.8 g of hexamethyldisilazane is added to 15 g of 68% mass fraction ethanol aqueous solution to obtain a pre-dispersed hexamethyldisilazane; 8 g of palm fiber is added to 55 g of 45% mass fraction ethanol aqueous solution, 4 g of tetraethyl orthosilicate is added, and ultrasonic treatment is performed for 80 min, the ultrasonic frequency is 65 kHz, the temperature is reduced to 2 ℃, the pH value of the system is adjusted to 5-6 by using 0.4 mol / L hydrochloric acid, and the ultrasonic treatment is continued for 1.5 h; the pre-dispersed hexamethyldisilazane is added dropwise under stirring, and after the dropwise addition is completed, the stirring is continued for 18 h, and then filtration, washing and vacuum drying are performed.

[0040] The preparation method of the palm fiber-containing thermal insulation wall material described above comprises the following steps: S1, R•SAC 42.5 grade sulphoaluminate cement, fine aggregate, closed cell perlite are dry mixed for 2 min, the dry mixing speed is 480 r / min, activated palm fiber, β-type hemihydrate gypsum are added and continue to stir for 2 min, to obtain premix a; S2, polycarboxylic acid water reducing agent, sodium gluconate, hydroxypropyl methyl cellulose, dispersible latex powder, defoaming agent are added to water and stirred uniformly to obtain premix b; S3, premix a and premix b are stirred uniformly.

[0041] Example 5: A palm fiber containing thermal insulation wall material, the raw materials of which include: R•SAC 42.5 grade sulphoaluminate cement 500g, β-type hemihydrate gypsum 8g, activated palm fiber 100g, fine aggregate 450g, closed cell perlite 150g, polycarboxylic acid water reducing agent 15g, sodium gluconate 0.3g, hydroxypropyl methyl cellulose 3g, dispersible latex powder 20g, defoaming agent 0.5g, water 190g.

[0042] The activated palm fiber is prepared by the following specific operation: 1.5g hexamethyldisilazane is added to 20g 65% mass fraction ethanol aqueous solution and stirred uniformly to obtain pre-dispersed hexamethyldisilazane; 10g palm fiber is added to 50g 50% mass fraction ethanol aqueous solution, 3g tetraethyl orthosilicate is added and ultrasonic treated for 90min, the ultrasonic frequency is 60kHz, the temperature is reduced to 3℃, the pH value of the system is adjusted to 5-6 by using 0.3mol / L hydrochloric acid, the ultrasonic treatment is continued for 2h, the pre-dispersed hexamethyldisilazane is added dropwise under stirring, after the dropwise addition is completed, the stirring is continued for 15h, filtration, washing, vacuum drying.

[0043] The preparation method of the palm fiber containing thermal insulation wall material, which comprises the following steps: S1, R•SAC 42.5 grade sulphoaluminate cement, fine aggregate, closed cell perlite are dry mixed for 2 min, the dry mixing speed is 480 r / min, activated palm fiber, β-type hemihydrate gypsum are added and continue to stir for 2 min, to obtain premix a; S2, polycarboxylic acid water reducing agent, sodium gluconate, hydroxypropyl methyl cellulose, dispersible latex powder, defoaming agent are added to water and stirred uniformly to obtain premix b; S3, premix a and premix b are stirred uniformly.

[0044] Comparative Example 1: A palm fiber containing thermal insulation wall material, the raw materials of which include: R•SAC 42.5 grade sulphoaluminate cement 500g, β-type hemihydrate gypsum 8g, palm fiber 100g, fine aggregate 450g, closed cell perlite 150g, polycarboxylic acid water reducing agent 15g, sodium gluconate 0.3g, hydroxypropyl methyl cellulose 3g, dispersible latex powder 20g, defoaming agent 0.5g, water 190g.

[0045] The preparation method of the thermal insulation wall material containing palm fiber comprises the following steps: S1, dry mixing R•SAC 42.5 grade sulphoaluminate cement, fine aggregate and closed cell perlite for 2 min at a dry mixing speed of 450 r / min, adding activated palm fiber and β-type hemihydrate gypsum to continue stirring for 3 min to obtain premix a; S2, adding polycarboxylic acid water reducing agent, sodium gluconate, hydroxypropyl methyl cellulose, dispersible latex powder and defoaming agent into water and stirring uniformly to obtain premix b; S3, stirring premix a and premix b uniformly.

[0046] Comparative Example 2: A thermal insulation wall material containing palm fiber, which raw materials include: R•SAC 42.5 grade sulphoaluminate cement 500 g, β-type hemihydrate gypsum 8 g, activated palm fiber 100 g, fine aggregate 450 g, closed cell perlite 150 g, polycarboxylic acid water reducing agent 15 g, sodium gluconate 0.3 g, hydroxypropyl methyl cellulose 3 g, dispersible latex powder 20 g, defoaming agent 0.5 g, and water 190 g.

[0047] The activated palm fiber is prepared by the following specific operation: 10 g of palm fiber is added to 50 g of 50% mass fraction ethanol aqueous solution, 3 g of tetraethyl orthosilicate is added, ultrasonic treatment is performed for 90 min, the ultrasonic frequency is 60 kHz, the temperature is reduced to 3℃, the pH value of the system is adjusted to 5-6 by using 0.3 mol / L hydrochloric acid, ultrasonic treatment is continued for 2 h, stirring is performed for 15 h, filtration, washing and vacuum drying are performed.

[0048] The preparation method of the thermal insulation wall material containing palm fiber comprises the following steps: S1, dry mixing R•SAC 42.5 grade sulphoaluminate cement, fine aggregate and closed cell perlite for 2 min at a dry mixing speed of 450 r / min, adding activated palm fiber and β-type hemihydrate gypsum to continue stirring for 3 min to obtain premix a; S2, adding polycarboxylic acid water reducing agent, sodium gluconate, hydroxypropyl methyl cellulose, dispersible latex powder and defoaming agent into water and stirring uniformly to obtain premix b; S3, stirring premix a and premix b uniformly.

[0049] The fluidity of the thermal insulation wall material obtained in Example 5 and Comparative Examples 1-2 is determined according to GB / T 2419-2005 “Cement mortar fluidity test method”. The final setting time of the thermal insulation wall material obtained in Example 5 and Comparative Examples 1-2 is determined according to JGJ / T 70-2009 “Building mortar basic performance test method standard”.

[0050] As Figure 1As shown, the thermal insulation wall material obtained in Example 5 has the highest fluidity and the shortest final setting time, which is better than Comparative Examples 1-2 (P<0.05).

[0051] The thermal insulation wall materials obtained in Example 5 and Comparative Examples 1-2 were pumped into a 3D printing system for 3D printing. Then, the compressive strength and flexural strength of the thermal insulation wall materials obtained in Example 5 and Comparative Examples 1-2 were determined in accordance with GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)".

[0052] like Figure 2 and Figure 3 As shown, the compressive strength and flexural strength of the thermal insulation wall material obtained in Example 5 are the highest, which are better than those of Comparative Examples 1-2 (P<0.05).

[0053] The thermal conductivity of the thermal insulation wall materials obtained in Example 5 and Comparative Examples 1-2 was determined with reference to GB / T 20473-2021 "Building Thermal Insulation Mortar". The 28-day impermeability pressure of the thermal insulation wall materials obtained in Example 5 and Comparative Examples 1-2 was determined with reference to GB / T 50082-2009 "Code for Construction and Acceptance of Waterproofing Engineering".

[0054] like Figure 4 As shown, although the thermal conductivity of the insulation wall material obtained in Example 5 was the lowest, it did not show a significant difference from Comparative Examples 1-2 (P>0.05); while the 28-day impermeability pressure of the insulation wall material obtained in Example 5 was the highest, which was better than that of Comparative Examples 1-2 (P<0.05).

[0055] The reasons for the above results are as follows: This invention utilizes the synergistic effect of a retarder and β-type hemihydrate gypsum to extend the workable time of the slurry by inhibiting the early hydration reaction of sulfate minerals. Simultaneously, the silanol groups on the surface of hexamethyldisilazine-modified palm fibers react with cement hydration products to form hydrated calcium silicate gel. Under the adsorption of the porous fiber structure, a localized slow-release effect is formed, achieving precise control of the initial and final setting times, ensuring that the mortar quickly sets after extrusion and maintains interlayer continuity. This invention also utilizes the hydrated calcium silicate generated by activated palm fibers to improve the adhesion between the fiber and matrix interface, significantly enhancing the toughness of the wall material. Furthermore, the in-situ modification with hexamethyldisilazine significantly improves the waterproof and impermeable performance of the material while meeting mechanical strength requirements. Combined with sulfoaluminate cement, this ensures the optimal balance between waterproof performance and mechanical strength.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A thermal insulation wall material containing palm fibers, characterized in that, The raw materials include, by mass fraction: 400-600 parts of sulphoaluminate cement, 5-12 parts of beta-type hemihydrate gypsum, 80-120 parts of activated palm fiber, 400-500 parts of fine aggregate, 100-200 parts of closed-cell perlite, 10-20 parts of water reducing agent, 0.1-0.5 parts of retarder, 1-5 parts of cellulose ether, 10-30 parts of dispersible latex powder, and 0.1-1 part of defoaming agent.

2. The palm fiber containing thermal insulation wall material according to claim 1, wherein, The fine aggregate includes: standard sand with a particle size of 0.1-0.6 mm, and diamond sand with a particle size of 0.6-1.2 mm, and the mass ratio of the standard sand to the diamond sand is 1-2:1-2.

3. The palm fiber containing thermal insulation wall material according to claim 1, wherein, The water reducing agent is a polycarboxylic acid water reducing agent.

4. The palm fiber containing thermal insulation wall material according to claim 1, wherein, The retarder is selected from sodium gluconate and / or boric acid.

5. The palm fiber containing thermal insulation wall material according to claim 1, wherein, The cellulose ether is hydroxypropyl methylcellulose.

6. The palm fiber containing thermal insulation wall material according to claim 1, wherein, The dispersible latex powder is an ethylene-vinyl acetate copolymer.

7. The palm fiber containing thermal insulation wall material according to claim 1, wherein The activated palm fiber is prepared by the following specific operation: adding hexamethyldisilazane into an aqueous ethanol solution to stir uniformly to obtain pre-dispersed hexamethyldisilazane; adding palm fiber into the aqueous ethanol solution, adding tetraethyl orthosilicate and ultrasonic treating for 1-2 h, cooling to 1-5℃, adjusting the pH value of the system to 5-6, continuing ultrasonic treating for 1-3 h, adding the pre-dispersed hexamethyldisilazane dropwise under stirring, continuing stirring for 10-20 h after the dropwise addition is completed, filtering, washing, and vacuum drying.

8. The palm fiber containing thermal insulation wall material according to claim 7, wherein, The mass ratio of the hexamethyldisilazane, the palm fiber, and the tetraethyl orthosilicate is 1-2:5-15:1-5.

9. A process for the production of a wall insulation material containing palm fibres as claimed in any one of claims 1 to 8, characterised in that, The method includes the following steps: S1, dry mixing the sulphoaluminate cement, the fine aggregate, and the closed-cell perlite for 1-3 min, adding the activated palm fiber and the beta-type hemihydrate gypsum and continuing stirring for 1-5 min to obtain a premix a; S2, adding the water reducing agent, the retarder, the cellulose ether, the dispersible latex powder, and the defoaming agent into water and stirring uniformly to obtain a premix b; S3, stirring the premix a and the premix b uniformly.

10. A wall printing method, characterized by, Pumping the palm fiber-containing thermal insulation wall material according to any one of claims 1-8 into a 3D printing system, and 3D printing according to a required building structure.

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