Lightweight thermal insulation partition board and preparation method thereof

Abstract

The invention discloses a lightweight thermal insulation partition board and a preparation method thereof, and relates to the technical field of building thermal insulation materials, the lightweight thermal insulation partition board is prepared by mixing fly ash, desulfurized gypsum, expanded perlite, glass fiber, water and a modified starch ether binder, pouring the mixture into a mold for compression molding, and curing. The modified starch ether binder used in the invention has the advantages of high bonding strength, low water absorption, strong flame retardancy, low cost and the like, and endows the lightweight thermal insulation partition board with excellent performances such as good mechanical strength, low water absorption, high fireproof safety and the like.

Description

Technical Field

[0001] This invention relates to the field of building insulation materials technology, specifically to a lightweight thermal insulation partition board and its preparation method. Background Technology

[0002] Fly ash is an industrial solid waste obtained by dust removal and collection of non-combustible mineral components after they have melted at high temperatures during the combustion of pulverized coal in coal-fired power plant boilers. Long-term accumulation of fly ash can occupy land, create potential geological hazards, and cause pollution of soil, water, and the atmosphere.

[0003] This study uses fly ash-desulfurized gypsum as a matrix to prepare lightweight insulation boards, which is beneficial for the recycling of fly ash waste. Water glass is used as an inorganic binder in this lightweight insulation board, resulting in high bonding strength after curing, but the preparation cost is high. Starch ether binders have strong environmental friendliness and cost advantages; however, their bonding strength is poor, they have strong water absorption, and their molecular chains lack flame-retardant groups, which increases the water absorption rate and reduces the flame retardancy of the lightweight insulation board, limiting its use in lightweight insulation boards.

[0004] Therefore, how to improve the bonding strength, water absorption and flame retardancy of starch ether binders and apply them to lightweight thermal insulation partition boards is an urgent issue that needs further exploration. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a lightweight thermal insulation partition board and its preparation method.

[0006] The objective of this invention can be achieved through the following technical solutions: A lightweight thermal insulation partition board comprises the following raw materials: fly ash, desulfurized gypsum, expanded perlite, glass fiber, water, and modified starch ether binder; Further, by weight, the amount of the raw materials is: 35-45 parts fly ash, 20-30 parts desulfurized gypsum, 5-10 parts expanded perlite, 1-1.5% glass fiber (by weight of fly ash and desulfurized gypsum), 25-35 parts water, and 8-10% modified starch ether binder (by weight of fly ash and desulfurized gypsum). Furthermore, the length of the glass fiber is 2-4 mm.

[0007] A method for preparing a lightweight thermal insulation partition board includes the following steps: Fly ash, desulfurized gypsum, and expanded perlite are mixed and stirred. Water, glass fiber, and modified starch ether binder are added, and stirring is continued to obtain a mixture. The mixture is poured into a mold, pressed into shape, and cured to obtain a lightweight thermal insulation partition board.

[0008] The preparation method of the lightweight thermal insulation partition board includes the following specific steps: Mix fly ash, desulfurized gypsum, and expanded perlite for 5-10 minutes, then add water, glass fiber, and modified starch ether binder, and continue mixing for 15-20 minutes to obtain a mixture. Pour the mixture into a mold, press it into shape, and cure it to obtain a lightweight thermal insulation partition board. Furthermore, the mold has dimensions of 240mm × 120mm × (25-30)mm; Furthermore, the pressing process is carried out under conditions of 60-62℃ and 20-22MPa, with pressure maintained for 1-2 minutes. Furthermore, the curing is carried out for 14-16 days under conditions of temperature of 15-25℃ and humidity of 60-80%.

[0009] The preparation method of the modified starch ether binder includes the following steps: Step (1): Dry the starch to obtain pretreated starch; mix the pretreated starch and acid anhydride, stir and heat, add the catalyst, control the pH and stir the reaction, adjust the pH after the reaction is completed to obtain product 1; Step (2): Mix product 1, polyol, anhydrous methanol and 4A molecular sieve, and heat and stir to react to obtain product 2; Step (3): After mixing and stirring product 2, anhydrous ethanol and triethylamine, add silane coupling agent, heat in oil bath and stir to react, and obtain modified starch ether binder.

[0010] The preparation method of the modified starch ether binder includes the following specific steps: Step (1): Dry the starch at 35-40℃ for 12-13h to obtain pretreated starch; mix the pretreated starch and acid anhydride, stir and heat to 30-35℃, add catalyst, control the pH to 7.5-8.5, stir for 2-3h, and after the reaction is complete, adjust the pH to 6.5-6.8 to obtain product 1; Further, the ratio of the pretreated starch, acid anhydride, and catalyst is 100g: 5-10g: 0.5-1g; the starch is one of corn starch, wheat starch, and potato starch; the acid anhydride is obtained by mixing succinic anhydride, 2-octenylsuccinic anhydride, and cis-1,2-cyclohexanedicarboxylic anhydride in a mass ratio of 3:2:0.5-1; the catalyst is sodium hydroxide. In step (1), the hydroxyl groups on the surface of the pretreated starch undergo an esterification reaction with acid anhydride to obtain a monoesterified product containing carboxyl groups, namely product 1. Step (2): Mix product 1, polyol, anhydrous methanol and 4A molecular sieve, stir at 35-40℃ for 2.5-3.5h, filter, wash with water and dry to obtain product 2; Furthermore, the ratio of product 1, polyol, and anhydrous methanol is 105g:10-12g:100-120mL, and 4A molecular sieve accounts for 8-10% of the total mass of product 1 and polyol; the polyol is obtained by mixing trihydroxyethyltriazine and tris(hydroxymethyl)aminomethane in a mass ratio of 1:0.5-0.7. In step (2), under the promoting effect of 4A molecular sieve, the carboxyl group in product 1 reacts with some of the hydroxyl groups in the polyol to obtain product 2; Step (3): Mix product 2, anhydrous ethanol and triethylamine and stir for 30-35 min, add silane coupling agent, heat to 50-55℃ in oil bath, stir for 2-3 h, rotary evaporate, dry to obtain modified starch ether binder; Further, the ratio of product 2, anhydrous ethanol, triethylamine, and silane coupling agent is 110g:120-130mL:8-10g:13-15g; the silane coupling agent is 3-glycidyl etheroxypropyltrimethoxysilane or 3-isocyanate-propyltrimethoxysilane. In step (3), product 2 reacts with the epoxy or isocyanate group in the silane coupling agent in anhydrous ethanol, and retains the methoxysilane under anhydrous conditions to obtain the modified starch ether binder.

[0011] In summary, compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention discloses a lightweight thermal insulation partition board and its preparation method. The lightweight thermal insulation partition board is obtained by mixing fly ash, desulfurized gypsum, expanded perlite, glass fiber, water, and modified starch ether binder, pouring the mixture into a mold, pressing it into shape, and then curing it. By adding expanded perlite, glass fiber, and modified starch ether binder to the fly ash-desulfurized gypsum insulation board formula, and through appropriate raw material ratios, a lightweight thermal insulation partition board with excellent comprehensive performance is obtained.

[0012] 2. The modified starch ether binder used in this invention is obtained by reacting starch, acid anhydride, polyol, and silane coupling agent as the main raw materials. The acid anhydride used is obtained by mixing succinic anhydride, 2-octenyl succinic anhydride, and cis-1,2-cyclohexane dicarboxylic anhydride in a certain proportion. The polyol used is obtained by mixing trihydroxyethyl triazine and tris(hydroxymethyl)aminomethane. Through the synergistic hydrophobic effect of the octene chain and cyclohexane in the acid anhydride and the triazine in the polyol, the water absorption rate of the modified starch ether binder is reduced. Furthermore, through hydrophobic association, the bonding strength of the modified starch ether binder is improved, thereby reducing the water absorption rate of the lightweight thermal insulation partition board and enhancing its mechanical strength.

[0013] 3. In the preparation of the modified starch ether binder of the present invention, the nitrogen-containing triazine ring and amino group introduced by the polyol, together with the methoxysilane in the silane coupling agent, generate a siloxane chain under alkaline conditions during the mixing of lightweight thermal insulation partition board raw materials. Through the synergistic effect of forming non-combustible gas to dilute combustible gas and generating a stable and dense carbon layer, the modified starch ether binder is endowed with strong flame retardancy, thereby improving the fire resistance of the lightweight thermal insulation partition board.

[0014] 4. In the preparation of the modified starch ether binder of the present invention, during the reaction process in step (2), the nitrogen-containing groups such as the triazine ring introduced by the polyol promote the reaction between the carboxyl group in product 1 and some of the hydroxyl groups in the polyol through weak alkaline catalysis. No additional catalyst is required, the preparation method is simple and low in cost, thereby reducing the preparation cost of lightweight thermal insulation partition board. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1 A modified starch ether binder, the preparation method of which includes the following steps: Step (1): Potato starch (supplier: Aladdin, item number S112495-2kg) was dried at 35℃ for 12h to obtain pretreated starch; the pretreated starch and acid anhydride were mixed, stirred and heated to 30℃, sodium hydroxide was added, and the pH was controlled at 7.5 with 0.1mol / L sodium hydroxide solution. The mixture was stirred for 2h, and the pH was adjusted to 6.5 with 0.1mol / L hydrochloric acid solution to obtain product 1; the ratio of pretreated starch, acid anhydride and sodium hydroxide was 100g:5g:0.5g; the acid anhydride was obtained by mixing succinic anhydride, 2-octenyl succinic anhydride and cis-1,2-cyclohexane dicarboxylic anhydride in a mass ratio of 3:2:0.5. Step (2): Mix product 1, polyol, anhydrous methanol, and 4A molecular sieve (supplier: Aladdin, item number M103748-1kg), stir at 35℃ for 2.5h, filter, wash with water, and dry at 45℃ for 6h to obtain product 2; the ratio of product 1, polyol, and anhydrous methanol is 105g:10g:100mL, and 4A molecular sieve accounts for 8% of the total mass of product 1 and polyol; the polyol is obtained by mixing trihydroxyethyltriazine and tris(hydroxymethyl)aminomethane in a mass ratio of 1:0.5. Step (3): Mix product 2, anhydrous ethanol, and triethylamine and stir for 30 min. Add 3-glycidyl etheroxypropyltrimethoxysilane, heat to 50°C in an oil bath, stir for 2 h, rotary evaporate at 40°C, and dry at 50°C for 6 h to obtain modified starch ether binder. The ratio of product 2, anhydrous ethanol, triethylamine, and 3-glycidyl etheroxypropyltrimethoxysilane is 110 g: 120 mL: 8 g: 13 g.

[0017] Example 2 A modified starch ether binder, the preparation method of which includes the following steps: Step (1): Wheat starch (supplier: Aladdin, item number W1373813-1kg) was dried at 37℃ for 12.5h to obtain pretreated starch; the pretreated starch and acid anhydride were mixed, stirred and heated to 33℃, sodium hydroxide was added, and the pH was controlled to 8.0 with 0.1mol / L sodium hydroxide solution. The mixture was stirred for 2.5h, and the pH was adjusted to 6.6 with 0.1mol / L hydrochloric acid solution to obtain product 1; the ratio of pretreated starch, acid anhydride and sodium hydroxide was 100g:8g:0.8g; the acid anhydride was obtained by mixing succinic anhydride, 2-octenyl succinic anhydride and cis-1,2-cyclohexane dicarboxylic anhydride in a mass ratio of 3:2:0.8. Step (2): Mix product 1, polyol, anhydrous methanol, and 4A molecular sieve (supplier: Aladdin, item number M103748-1kg), stir at 37℃ for 3.0h, filter, wash with water, and dry at 45℃ for 7h to obtain product 2; the ratio of product 1, polyol, and anhydrous methanol is 105g:11g:110mL, and 4A molecular sieve accounts for 9% of the total mass of product 1 and polyol; the polyol is obtained by mixing trihydroxyethyltriazine and tris(hydroxymethyl)aminomethane in a mass ratio of 1:0.6. Step (3): Mix product 2, anhydrous ethanol, and triethylamine and stir for 33 min. Add 3-isocyanate-propyltrimethoxysilane, heat to 53°C in an oil bath, stir for 2.5 h, rotary evaporate at 40°C, and dry at 50°C for 6 h to obtain modified starch ether binder. The ratio of product 2, anhydrous ethanol, triethylamine, and 3-isocyanate-propyltrimethoxysilane is 110 g: 125 mL: 9 g: 14 g.

[0018] Example 3 A modified starch ether binder, the preparation method of which includes the following steps: Step (1): Corn starch (supplier: Aladdin, item number S116030-1kg) was dried at 40℃ for 13h to obtain pretreated starch; the pretreated starch and acid anhydride were mixed, stirred and heated to 35℃, sodium hydroxide was added, and the pH was controlled at 8.5 with 0.1mol / L sodium hydroxide solution. After stirring for 3h, the pH was adjusted to 6.8 with 0.1mol / L hydrochloric acid solution to obtain product 1; the ratio of pretreated starch, acid anhydride and sodium hydroxide was 100g:10g:1g; the acid anhydride was obtained by mixing succinic anhydride, 2-octenyl succinic anhydride and cis-1,2-cyclohexanedicarboxylic anhydride in a mass ratio of 3:2:1. Step (2): Mix product 1, polyol, anhydrous methanol, and 4A molecular sieve, stir at 40℃ for 3.5h, filter, wash with water, and dry at 45℃ for 8h to obtain product 2; the ratio of product 1, polyol, and anhydrous methanol is 105g:12g:120mL, and 4A molecular sieve accounts for 10% of the total mass of product 1 and polyol; the polyol is obtained by mixing trihydroxyethyltriazine and tris(hydroxymethyl)aminomethane at a mass ratio of 1:0.7. Step (3): Mix product 2, anhydrous ethanol, and triethylamine and stir for 35 min. Add 3-glycidyl etheroxypropyltrimethoxysilane, heat to 55°C in an oil bath, stir for 3 h, rotary evaporate at 40°C, and dry at 50°C for 6 h to obtain modified starch ether binder. The ratio of product 2, anhydrous ethanol, triethylamine, and 3-glycidyl etheroxypropyltrimethoxysilane is 110 g: 130 mL: 10 g: 15 g.

[0019] Example 4 A lightweight thermal insulation partition board, by weight, comprises the following raw materials in the following proportions: 35 parts fly ash (supplier: Hebei Leijiang New Material Technology Co., Ltd., 325 mesh), 20 parts desulfurized gypsum (supplier: Hebei Yousheng Refractory Materials Co., Ltd., item number 1030), 5 parts expanded perlite (supplier: Lingshou County Wanzhu Mineral Products Co., Ltd., specification 25kg / bag), 1% glass fiber by weight of the total mass of fly ash and desulfurized gypsum, 25 parts water, and 8% modified starch ether binder obtained in Example 1 by weight of the total mass of fly ash and desulfurized gypsum; the glass fiber (supplier: Taian Hongfang New Material Co., Ltd.) has a length of 2mm; A method for preparing a lightweight thermal insulation partition board includes the following steps: Fly ash, desulfurized gypsum, and expanded perlite were mixed and stirred for 5 minutes. Water, glass fiber, and the modified starch ether binder obtained in Example 1 were added, and stirring was continued for 15 minutes to obtain a mixture. The mixture was poured into a mold, pressed and shaped, and cured to obtain a lightweight thermal insulation partition board. The mold had dimensions of 240mm × 120mm × 25mm. The pressing and shaping were carried out at a temperature of 60℃ and a pressure of 20MPa for 1 minute. The curing was carried out at a temperature of 15℃ and a humidity of 60% for 14 days.

[0020] Example 5 A lightweight thermal insulation partition board, by weight, comprises the following raw materials in the following proportions: 40 parts fly ash (supplier: Hebei Leijiang New Material Technology Co., Ltd., 325 mesh), 25 parts desulfurized gypsum (supplier: Hebei Yousheng Refractory Materials Co., Ltd., item number 1030), 8 parts expanded perlite (supplier: Lingshou County Wanzhu Mineral Products Co., Ltd., specification 25kg / bag), 1.3% glass fiber by weight of fly ash and desulfurized gypsum, 30 parts water, and 9% modified starch ether binder obtained in Example 2 by weight of fly ash and desulfurized gypsum; the glass fiber (supplier: Taian Hongfang New Material Co., Ltd.) has a length of 3mm; A method for preparing a lightweight thermal insulation partition board includes the following steps: Fly ash, desulfurized gypsum, and expanded perlite were mixed and stirred for 8 minutes. Water, glass fiber, and the modified starch ether binder obtained in Example 2 were added, and stirring was continued for 18 minutes to obtain a mixture. The mixture was poured into a mold, pressed and shaped, and cured to obtain a lightweight thermal insulation partition board. The mold had dimensions of 240mm × 120mm × 27mm. The pressing and shaping were carried out at a temperature of 61℃ and a pressure of 21MPa for 1.5 minutes. The curing was carried out at a temperature of 20℃ and a humidity of 70% for 15 days.

[0021] Example 6 A lightweight thermal insulation partition board, by weight, comprises the following raw materials in the following proportions: 45 parts fly ash (supplier: Hebei Leijiang New Material Technology Co., Ltd., 325 mesh), 30 parts desulfurized gypsum (supplier: Hebei Yousheng Refractory Materials Co., Ltd., item number 1030), 10 parts expanded perlite (supplier: Lingshou County Wanzhu Mineral Products Co., Ltd., specification 25kg / bag), 1.5% glass fiber by weight of fly ash and desulfurized gypsum, 35 parts water, and 10% modified starch ether binder obtained in Example 3 by weight of fly ash and desulfurized gypsum; the glass fiber (supplier: Taian Hongfang New Material Co., Ltd.) has a length of 4mm; A method for preparing a lightweight thermal insulation partition board includes the following steps: Fly ash, desulfurized gypsum, and expanded perlite were mixed and stirred for 10 minutes. Water, glass fiber, and the modified starch ether binder obtained in Example 3 were added, and stirring was continued for 20 minutes to obtain a mixture. The mixture was poured into a mold, pressed and shaped, and cured to obtain a lightweight thermal insulation partition board. The mold had dimensions of 240mm × 120mm × 30mm. The pressing and shaping were carried out at a temperature of 62℃ and a pressure of 22MPa for 2 minutes. The curing was carried out at a temperature of 25℃ and a humidity of 80% for 16 days.

[0022] Comparative Example 1 Compared with Example 6, the 2-octenyl succinic anhydride used in the preparation of the modified starch ether binder was replaced with azelaic acid, and the rest was exactly the same as in Example 6, to obtain a lightweight thermal insulation partition board.

[0023] Comparative Example 2 Compared with Example 6, the modified starch ether binder used in the preparation of the modified starch ether binder was replaced with phthalic acid, and the rest was exactly the same as in Example 6, to obtain a lightweight thermal insulation partition board.

[0024] Comparative Example 3 Compared with Example 6, the trihydroxyethyltriazine used in the preparation of the modified starch ether binder was replaced with triethanolamine, and the rest was exactly the same as in Example 6, to obtain a lightweight thermal insulation partition board.

[0025] Comparative Example 4 Compared with Example 6, the 3-glycidyl ether oxypropyltrimethoxysilane used in the preparation of the modified starch ether binder was replaced with epichlorohydrin, and the rest was exactly the same as in Example 6, to obtain a lightweight thermal insulation partition board.

[0026] The lightweight thermal insulation partition boards prepared in Examples 4-6 and Comparative Examples 1-4 of this invention are further tested using the following methods: Flexural strength and compressive strength: tested according to GB / T 23451-2023 "Lightweight partition wall panels for building". Fire resistance: Based on the test of GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products", it is divided into four levels: Class A (non-combustible), Class B1 (flame-retardant), Class B2 (combustible) and Class B3 (flammable); Water absorption rate: Tested according to GB / T 23451-2023 "Lightweight partition wall panels for building", using the mass method, with a test time of 24 hours; The test results are recorded in Table 1.

[0027] Table 1 Test Results

[0028] According to the data in Table 1, the lightweight thermal insulation partition board prepared by the present invention has strong compressive strength, flexural strength and fire resistance, as well as low water absorption.

[0029] Comparing Example 6 with Comparative Example 1, it can be seen that Comparative Example 1 replaced 2-octenyl succinic anhydride in the modified starch ether binder with azelaic acid, indicating that the lightweight thermal insulation partition board prepared by the present invention has higher compressive strength and flexural strength, and lower water absorption.

[0030] Comparing Example 6 with Comparative Example 2, it can be seen that Comparative Example 2 replaced cis-1,2-cyclohexanedicarboxylic anhydride in the modified starch ether binder with phthalic acid, indicating that the lightweight thermal insulation partition board prepared by the present invention has higher compressive strength and flexural strength, and lower water absorption.

[0031] Comparing Example 6 with Comparative Example 3, it can be seen that Comparative Example 3 replaced trihydroxyethyltriazine in the preparation of the modified starch ether binder with triethanolamine, indicating that the lightweight thermal insulation partition board prepared by the present invention has stronger compressive strength and flexural strength, lower water absorption, and better fire resistance.

[0032] Comparing Example 6 with Comparative Example 4, it can be seen that Comparative Example 4 replaced 3-glycidyl ether oxypropyltrimethoxysilane in the preparation of the modified starch ether binder with epichlorohydrin, indicating that the lightweight thermal insulation partition board prepared by the present invention has a lower water absorption rate and better fire resistance.

[0033] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A lightweight thermal insulation partition board, characterized in that: The raw materials include: fly ash, desulfurized gypsum, expanded perlite, glass fiber, water, and modified starch ether binder.

2. The lightweight thermal insulation partition board according to claim 1, characterized in that: The raw materials, by weight, are: 35-45 parts fly ash, 20-30 parts desulfurized gypsum, 5-10 parts expanded perlite, 1-1.5% glass fiber (by weight of fly ash and desulfurized gypsum), 25-35 parts water, and 8-10% modified starch ether binder (by weight of fly ash and desulfurized gypsum).

3. The lightweight thermal insulation partition board according to claim 1, characterized in that: The preparation method of the modified starch ether binder includes the following steps: Step (1): Dry the starch to obtain pretreated starch; mix the pretreated starch and acid anhydride, stir and heat, add the catalyst, control the pH and stir the reaction, adjust the pH after the reaction is completed to obtain product 1; Step (2): Mix product 1, polyol, anhydrous methanol and 4A molecular sieve, heat and stir to react, and obtain product 2; Step (3): After mixing and stirring product 2, anhydrous ethanol and triethylamine, add silane coupling agent, heat in oil bath and stir to react, and obtain modified starch ether binder.

4. The lightweight thermal insulation partition board according to claim 3, characterized in that: In step (1), the ratio of the amount of pretreated starch, acid anhydride and catalyst is 100g: 5-10g: 0.5-1g; the acid anhydride is obtained by mixing succinic anhydride, 2-octenyl succinic anhydride and cis-1,2-cyclohexanedicarboxylic anhydride in a mass ratio of 3:2:0.5-1.

5. A lightweight thermal insulation partition board according to claim 3, characterized in that: In step (1), the pH is controlled at 7.5-8.5; after the reaction is completed, the pH is adjusted to 6.5-6.

8.

6. A lightweight thermal insulation partition board according to claim 3, characterized in that: In step (2), the ratio of product 1, polyol and anhydrous methanol is 105g:10-12g:100-120mL, and 4A molecular sieve accounts for 8-10% of the total mass of product 1 and polyol.

7. A lightweight thermal insulation partition board according to claim 3, characterized in that: In step (2), the polyol is obtained by mixing trihydroxyethyltriazine and tri(hydroxymethyl)aminomethane in a mass ratio of 1:0.5-0.

7.

8. A lightweight thermal insulation partition board according to claim 3, characterized in that: In step (3), the ratio of product 2, anhydrous ethanol, triethylamine, and silane coupling agent is 110g:120-130mL:8-10g:13-15g; the silane coupling agent is 3-glycidyl etheroxypropyltrimethoxysilane or 3-isocyanate propyltrimethoxysilane.

9. A method for preparing a lightweight thermal insulation partition wall panel according to any one of claims 1-8, characterized in that: Includes the following steps: After mixing fly ash, desulfurized gypsum, and expanded perlite, water, glass fiber, and modified starch ether binder are added, and the mixture is stirred to obtain a mixture. The mixture is poured into a mold, pressed into shape, and cured to obtain a lightweight thermal insulation partition board.

10. The method for preparing a lightweight thermal insulation partition wall panel according to claim 9, characterized in that: The pressing and molding process involves holding the pressure at 60-62℃ and 20-22MPa for 1-2 minutes; the curing process involves curing at 15-25℃ and 60-80% humidity for 14-16 days.

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