Preparation method of a waterproof and heat-insulating homogeneous board

Abstract

The present invention discloses a preparation method of a waterproof and heat-insulating homogeneous board. The homogeneous board comprises the following raw materials in parts by weight: 80-100 parts of portland cement, 40-50 parts of modified polystyrene, 5-8 parts of modified basalt fiber, 1.5-3 parts of early strength agent, and 5-10 parts of silica fume. When the raw materials are blended and then subjected to high-temperature and high-pressure heat preservation pressing, the pentane inside the modified polystyrene evaporates, causing the modified polystyrene to form a foamed material. Both the internal cellulose structure and the surrounding basalt fibers contain a large number of pores, which can effectively reduce heat transfer. At the same time, the basalt fiber has an extremely low thermal conductivity, making the prepared homogeneous board have good heat-insulating effect. After high-temperature and high-pressure heat preservation pressing, it is treated with a treatment liquid to form a hydrophobic film on the surface gaps. Glutaraldehyde is added, and the aldehyde group on the glutaraldehyde will graft with the amino group of the polysiloxane side chain, thereby increasing the compactness of the hydrophobic film, and further ensuring the waterproof property of the homogeneous board and increasing its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of homogeneous board preparation, and particularly relates to a preparation method of a waterproof and heat-insulating homogeneous board. Background Art

[0002] With the rapid growth of the construction industry, the demand for thermal insulation materials is continuously increasing. Traditional thermal insulation materials often have problems such as poor stability, high cost, and easy decomposition, and it is difficult to meet the requirements of modern buildings for high efficiency and environmental protection. The homogeneous board is a fireproof and heat-insulating material, mainly composed of silicon and calcium minerals and modified additives. During the production of the homogeneous board, composite expanded polystyrene foam particles are also incorporated, which greatly improves the heat-insulating effect of the homogeneous board. However, the waterproof performance of the homogeneous board is poor. During long-term use, affected by moisture, water enters the interior of the homogeneous board, and the polystyrene foam particles are in contact with water for a long time, resulting in their own ulceration, which greatly reduces the heat-insulating effect. In severe cases, the heat-insulating effect is even lost, making the homogeneous board completely ineffective. Summary of the Invention

[0003] The purpose of the present invention is to provide a preparation method of a waterproof and heat-insulating homogeneous board, which solves the problem that the heat-insulating effect of the homogeneous board will significantly decrease during long-term use in a humid environment at the present stage.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A preparation method of a waterproof and heat-insulating homogeneous board specifically includes the following steps:

[0006] Step A1: Mix basalt fibers and hydrochloric acid solution evenly. Under the conditions of a rotation speed of 300 - 500 r / min and a temperature of 80 - 85 °C, stir for 4 - 6 h, then filter to remove the filtrate, and wash with deionized water until neutral to obtain pretreated fibers. Disperse the pretreated fibers in ethanol, and under the conditions of a rotation speed of 120 - 150 r / min and a temperature of 60 - 70 °C, stir and add 3-mercaptopropyltriethoxysilane and deionized water, and react for 1 - 1.5 h to obtain modified basalt fibers;

[0007] Step A2: Mix octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane, deionized water, and dimethyl sulfoxide, introduce nitrogen protection, and under the conditions of a rotation speed of 150 - 200 r / min and a temperature of 75 - 80 °C, react for 3 - 5 h to obtain polysiloxane. Mix the polysiloxane, benzophenone, and N,N-dimethylacetamide to obtain a treatment liquid;

[0008] Step A3: Weigh the following raw materials in parts by weight: 80 - 100 parts of portland cement, 40 - 50 parts of modified polystyrene, 5 - 8 parts of modified basalt fiber, 1.5 - 3 parts of early strength agent, and 5 - 10 parts of silica fume. Mix the raw materials evenly. Under the conditions of steam temperature of 110 - 130 °C and pressure of 0.3 - 0.5 MPa, keep warm for 30 - 60 s, then cool down to 80 - 85 °C, press for 4 - 6 h, soak in the treatment liquid for 3 - 5 min, take out until no liquid drips, irradiate with 365 nm ultraviolet light for 30 - 40 s, spray glutaraldehyde on the surface, and keep warm at 50 - 60 °C for 8 - 10 h to obtain a waterproof and heat - insulating homogeneous board.

[0009] Furthermore, the dosage ratio of the basalt fiber to the hydrochloric acid solution in Step A1 is 1 g:15 mL, the mass fraction of the hydrochloric acid solution is 4%, and the dosage of 3 - mercaptopropyltriethoxysilane is 1% of the mass of the pretreated fiber.

[0010] Furthermore, the dosage ratio of octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3 - aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane, and deionized water in Step A2 is 2.5 mol:1.3 mol:1 mol:4 mol:6 mol:5 L, and the mass ratio of polysiloxane, benzophenone, and N,N - dimethylacetamide is 1:0.05:8.

[0011] Furthermore, the modified polystyrene is prepared by the following steps:

[0012] Step B1: Mix N - hydroxyphthalimide, copper chloride, sodium hypochlorite, and deionized water evenly. Under the conditions of a rotation speed of 150 - 200 r / min and a temperature of 70 - 75 °C, stir and add bamboo cellulose, and react for 2 - 3 h. Filter to remove the filtrate to obtain carboxylated bamboo fiber. Mix the carboxylated bamboo fiber, 3 - aminopropyltriethoxysilane, dicyclohexylcarbodiimide, and toluene, introduce nitrogen protection, and under the conditions of a rotation speed of 200 - 300 r / min and a temperature of 25 - 30 °C, react for 2 - 3 h to obtain modified cellulose.

[0013] Step B2: Mix the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3 - mercaptopropyltriethoxysilane, and ethanol evenly. Under the conditions of a rotation speed of 120 - 150 r / min and a temperature of 65 - 70 °C, stir and add deionized water and hydrochloric acid, react for 2 - 3 h, then raise the temperature to 120 - 130 °C and continue to react for 3 - 5 h to obtain a precursor.

[0014] Step B3: Mix fumaric acid, octadecylamine, dicyclohexylcarbodiimide and toluene, introduce nitrogen for protection, and react for 1 - 1.5 h under the conditions of a rotation speed of 200 - 300 r / min and a temperature of 25 - 30 °C to obtain a modified monomer. Mix styrene, the modified monomer, pentane and a precursor evenly, stir and add potassium persulfate under the conditions of a rotation speed of 120 - 150 r / min and a temperature of 80 - 85 °C, and react for 3 - 5 h to obtain modified polystyrene.

[0015] Further, the dosage ratio of N-hydroxyphthalimide, copper chloride, sodium hypochlorite, deionized water and bamboo cellulose described in Step B1 is 3 mmol: 3 mmol: 14 mmol: 30 mL: 1.5 g, and the molar ratio of the carboxyl groups on the carboxylated bamboo fiber, 3-aminopropyltriethoxysilane and dicyclohexylcarbodiimide is 1: 1: 1.1.

[0016] Further, the dosage ratio of the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, ethanol, deionized water and hydrochloric acid described in Step B2 is 1 g: 1 mL: 2 mL: 1 mL: 30 mL: 3 mL: 1 mL, and the mass fraction of hydrochloric acid is 5%.

[0017] Further, the molar ratio of fumaric acid, octadecylamine and dicyclohexylcarbodiimide described in Step B3 is 1: 2: 2.1, the mass ratio of styrene, the modified monomer, pentane and the precursor is 50 - 60: 10 - 15: 8 - 10: 1 - 2, and the dosage of potassium persulfate is 1% of the sum of the masses of styrene and the modified monomer.

[0018] Beneficial effects of the present invention: A waterproof and heat-insulating homogeneous board disclosed by the present invention uses basalt fiber as a raw material, treats it with hydrochloric acid solution to obtain pretreated fiber, modifies the pretreated fiber with 3-mercaptopropyltriethoxysilane to graft mercapto groups on the surface to obtain modified basalt fiber. Ring-opening octamethylcyclotetrasiloxane and methyltrifluoropropyltrisiloxane and hydrolytic condensation with (3-aminopropyl)diethoxyethylsilane, and then end-capping with tetramethyldivinyldisiloxane to obtain polysiloxane. Dissolve the polysiloxane in N,N-dimethylacetamide to obtain a treatment solution. After mixing portland cement, modified polystyrene, modified basalt fiber, early strength agent and silica fume and performing high-temperature and high-pressure heat-insulating pressing, soak it in the treatment solution. The treatment solution enters the gaps on the surface. After taking it out until no liquid drips, irradiate it with ultraviolet light to make the double bonds on the polysiloxane react with the mercapto groups on the modified basalt fiber and the mercapto groups on the modified polystyrene. Then spray glutaraldehyde on the surface and perform heat-insulating treatment to obtain the waterproof and heat-insulating homogeneous board.

[0019] Modified polystyrene is prepared by oxidizing bamboo fiber as a raw material, grafting carboxyl groups onto the bamboo fiber molecules to obtain carboxylated bamboo fiber, reacting the carboxylated bamboo fiber with 3-aminopropyltriethoxysilane to cause dehydration reaction between the carboxyl groups on the carboxylated bamboo fiber and the amino groups on 3-aminopropyltriethoxysilane to obtain modified cellulose, hydrolyzing and condensing the modified fiber, dimethyldiethoxysilane, phenyltriethoxysilane and 3-mercaptopropyltriethoxysilane to coat the surface of the modified cellulose with an organosilicon resin and having a mercapto group on the outside to obtain a precursor, reacting fumaric acid with octadecylamine to cause reaction between the carboxyl groups on fumaric acid and the amino groups on octadecylamine to obtain a modified monomer, mixing styrene, the modified monomer, pentane and the precursor, and polymerizing styrene and the modified monomer under the action of potassium persulfate to obtain modified polystyrene.

[0020] When the raw materials are blended and then subjected to high-temperature and high-pressure heat preservation pressing, the pentane inside the modified polystyrene evaporates, causing the modified polystyrene to form a foamed material. Both the internal cellulose structure and the surrounding basalt fibers contain a large number of pores. The porous structure in these pores is filled with air, and air is a gas with extremely low thermal conductivity, which can effectively reduce heat transfer. At the same time, the basalt fibers have extremely low thermal conductivity, making the prepared homogeneous board have good heat preservation effect. After high-temperature and high-pressure heat preservation pressing, it is treated with a treatment liquid to form a hydrophobic film on the surface gaps. Glutaraldehyde is added, and the aldehyde groups on the glutaraldehyde will graft with the amino groups on the side chains of polysiloxane, thereby increasing the density of the hydrophobic film and then ensuring the waterproof property of the homogeneous board and increasing the service life. Specific Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0022] Example 1, A preparation method of a waterproof and heat-insulating homogeneous board specifically includes the following steps:

[0023] Step A1: Mix basalt fiber and hydrochloric acid solution evenly, under the conditions of a rotation speed of 300 r / min and a temperature of 80 °C, stir for 4 h, then filter to remove the filtrate, and wash with deionized water until neutral to obtain pretreated fiber. Disperse the pretreated fiber in ethanol, under the conditions of a rotation speed of 120 r / min and a temperature of 60 °C, stir and add 3-mercaptopropyltriethoxysilane and deionized water, and react for 1 h to obtain modified basalt fiber;

[0024] Step A2: Mix octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane, deionized water and dimethyl sulfoxide, introduce nitrogen for protection, and react for 3 h under the conditions of a rotation speed of 150 r / min and a temperature of 75 °C to obtain polysiloxane. Mix the polysiloxane, benzophenone and N,N-dimethylacetamide to obtain a treatment liquid;

[0025] Step A3: Weigh the following raw materials in parts by weight: 80 parts of portland cement, 40 parts of modified polystyrene, 5 parts of modified basalt fiber, 1.5 parts of early strength agent and 5 parts of silica fume. Mix the raw materials evenly, keep warm for 30 s under the conditions of a steam temperature of 110 °C and a pressure of 0.3 MPa, then cool down to 80 °C, press for 4 h, soak in the treatment liquid for 3 min, take out until no liquid drips, irradiate with 365 nm ultraviolet light for 30 s, spray glutaraldehyde on the surface, and keep warm at 50 °C for 8 h to obtain a waterproof and heat-insulating homogeneous board.

[0026] The dosage ratio of the basalt fiber described in Step A1 to the hydrochloric acid solution is 1 g:15 mL, the mass fraction of the hydrochloric acid solution is 4%, and the dosage of 3-mercaptopropyltriethoxysilane is 1% of the mass of the pretreated fiber.

[0027] The dosage ratio of octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane and deionized water described in Step A2 is 2.5 mol:1.3 mol:1 mol:4 mol:6 mol:5 L, and the mass ratio of polysiloxane, benzophenone and N,N-dimethylacetamide is 1:0.05:8.

[0028] The type of the portland cement described in Step A3 is PO42.5, the early strength agent is sodium sulfate, and the particle size of the silica fume is 0.2 μm.

[0029] The modified polystyrene described above is prepared by the following steps:

[0030] Step B1: Mix N-hydroxyphthalimide, copper chloride, sodium hypochlorite and deionized water evenly, stir and add bamboo cellulose under the conditions of a rotation speed of 150 r / min and a temperature of 70 °C, react for 2 h, filter to remove the filtrate to obtain carboxylated bamboo fiber. Mix the carboxylated bamboo fiber, 3-aminopropyltriethoxysilane, dicyclohexylcarbodiimide and toluene, introduce nitrogen for protection, and react for 2 h under the conditions of a rotation speed of 200 r / min and a temperature of 25 °C to obtain modified cellulose;

[0031] Step B2: Mix the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, and ethanol evenly. Under the conditions of a rotation speed of 120 r / min and a temperature of 65 °C, stir and add deionized water and hydrochloric acid, and react for 2 h. Then, raise the temperature to 120 °C and continue to react for 3 h to obtain a precursor.

[0032] Step B3: Mix fumaric acid, octadecylamine, dicyclohexylcarbodiimide, and toluene, and introduce nitrogen protection. Under the conditions of a rotation speed of 200 r / min and a temperature of 25 °C, react for 1 h to obtain a modified monomer. Mix styrene, the modified monomer, pentane, and the precursor evenly. Under the conditions of a rotation speed of 120 r / min and a temperature of 80 °C, stir and add potassium persulfate, and react for 3 h to obtain modified polystyrene.

[0033] The dosage ratio of N-hydroxyphthalimide, copper chloride, sodium hypochlorite, deionized water, and bamboo cellulose described in Step B1 is 3 mmol: 3 mmol: 14 mmol: 30 mL: 1.5 g, and the molar ratio of carboxyl groups on carboxylated bamboo fibers, 3-aminopropyltriethoxysilane, and dicyclohexylcarbodiimide is 1:1:1.1.

[0034] The dosage ratio of the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, ethanol, deionized water, and hydrochloric acid described in Step B2 is 1 g: 1 mL: 2 mL: 1 mL: 30 mL: 3 mL: 1 mL, and the mass fraction of hydrochloric acid is 5%.

[0035] The molar ratio of fumaric acid, octadecylamine, and dicyclohexylcarbodiimide described in Step B3 is 1:2:2.1, the mass ratio of styrene, the modified monomer, pentane, and the precursor is 50:10:8:1, and the dosage of potassium persulfate is 1% of the sum of the masses of styrene and the modified monomer.

[0036] Example 2, a preparation method of a waterproof and heat-insulating homogeneous board, specifically includes the following steps:

[0037] Step A1: Mix basalt fibers and hydrochloric acid solution evenly. Under the conditions of a rotation speed of 300 r / min and a temperature of 80 °C, stir and process for 5 h, then filter to remove the filtrate, and wash with deionized water until neutral to obtain pretreated fibers. Disperse the pretreated fibers in ethanol. Under the conditions of a rotation speed of 150 r / min and a temperature of 65 °C, stir and add 3-mercaptopropyltriethoxysilane and deionized water, and react for 1.5 h to obtain modified basalt fibers.

[0038] Step A2: Mix octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane, deionized water and dimethyl sulfoxide, introduce nitrogen for protection, and react for 4 h under the conditions of a rotation speed of 150 r / min and a temperature of 80 °C to obtain polysiloxane. Mix the polysiloxane, benzophenone and N,N-dimethylacetamide to obtain a treatment solution;

[0039] Step A3: Weigh the following raw materials in parts by weight: 90 parts of portland cement, 45 parts of modified polystyrene, 6 parts of modified basalt fiber, 2 parts of early strength agent and 8 parts of silica fume. Mix the raw materials evenly, keep warm for 45 s under the conditions of a steam temperature of 120 °C and a pressure of 0.4 MPa, then cool down to 85 °C, press for 5 h, soak in the treatment solution for 4 min, take out until no liquid drips, irradiate with 365 nm ultraviolet light for 35 s, spray glutaraldehyde on the surface, and keep warm at 55 °C for 9 h to obtain a waterproof and heat-insulating homogeneous board.

[0040] The dosage ratio of the basalt fiber to the hydrochloric acid solution in Step A1 is 1 g:15 mL, the mass fraction of the hydrochloric acid solution is 4%, and the dosage of 3-mercaptopropyltriethoxysilane is 1% of the mass of the pretreated fiber.

[0041] The dosage ratio of octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane and deionized water in Step A2 is 2.5 mol:1.3 mol:1 mol:4 mol:6 mol:5 L, and the mass ratio of polysiloxane, benzophenone and N,N-dimethylacetamide is 1:0.05:8.

[0042] The type of the portland cement in Step A3 is PO42.5, the early strength agent is sodium sulfate, and the particle size of the silica fume is 0.2 μm.

[0043] The modified polystyrene is prepared by the following steps:

[0044] Step B1: Mix N-hydroxyphthalimide, copper chloride, sodium hypochlorite and deionized water evenly, stir and add bamboo cellulose under the conditions of a rotation speed of 150 r / min and a temperature of 75 °C, react for 3 h, filter to remove the filtrate to obtain carboxylated bamboo fiber. Mix the carboxylated bamboo fiber, 3-aminopropyltriethoxysilane, dicyclohexylcarbodiimide and toluene, introduce nitrogen for protection, and react for 2 h under the conditions of a rotation speed of 200 r / min and a temperature of 30 °C to obtain modified cellulose;

[0045] Step B2: Mix the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, and ethanol evenly. Under the conditions of a rotation speed of 150 r / min and a temperature of 65 °C, stir and add deionized water and hydrochloric acid, and react for 3 h. Then, raise the temperature to 125 °C and continue to react for 4 h to obtain a precursor.

[0046] Step B3: Mix fumaric acid, octadecylamine, dicyclohexylcarbodiimide, and toluene, introduce nitrogen protection, and react for 1 h under the conditions of a rotation speed of 200 r / min and a temperature of 30 °C to obtain a modified monomer. Mix styrene, the modified monomer, pentane, and the precursor evenly. Under the conditions of a rotation speed of 150 r / min and a temperature of 80 °C, stir and add potassium persulfate, and react for 4 h to obtain modified polystyrene.

[0047] The dosage ratio of N-hydroxyphthalimide, copper chloride, sodium hypochlorite, deionized water, and bamboo cellulose described in Step B1 is 3 mmol: 3 mmol: 14 mmol: 30 mL: 1.5 g, and the molar ratio of carboxyl groups on carboxylated bamboo fibers, 3-aminopropyltriethoxysilane, and dicyclohexylcarbodiimide is 1: 1: 1.1.

[0048] The dosage ratio of the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, ethanol, deionized water, and hydrochloric acid described in Step B2 is 1 g: 1 mL: 2 mL: 1 mL: 30 mL: 3 mL: 1 mL, and the mass fraction of hydrochloric acid is 5%.

[0049] The molar ratio of fumaric acid, octadecylamine, and dicyclohexylcarbodiimide described in Step B3 is 1: 2: 2.1, the mass ratio of styrene, the modified monomer, pentane, and the precursor is 55: 13: 9: 1.5, and the dosage of potassium persulfate is 1% of the sum of the masses of styrene and the modified monomer.

[0050] Example 3, a preparation method of a waterproof and heat-insulating homogeneous board, specifically includes the following steps:

[0051] Step A1: Mix basalt fibers and hydrochloric acid solution evenly. Under the conditions of a rotation speed of 500 r / min and a temperature of 85 °C, stir for 6 h, then filter to remove the filtrate, and wash with deionized water until neutral to obtain pretreated fibers. Disperse the pretreated fibers in ethanol, and under the conditions of a rotation speed of 150 r / min and a temperature of 70 °C, stir and add 3-mercaptopropyltriethoxysilane and deionized water, and react for 1.5 h to obtain modified basalt fibers.

[0052] Step A2: Mix octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane, deionized water and dimethyl sulfoxide, introduce nitrogen for protection, and carry out a reaction for 5 h under the conditions of a rotation speed of 200 r / min and a temperature of 80 °C to obtain polysiloxane. Mix the polysiloxane, benzophenone and N,N-dimethylacetamide to obtain a treatment liquid;

[0053] Step A3: Weigh the following raw materials in parts by weight: 100 parts of Portland cement, 50 parts of modified polystyrene, 8 parts of modified basalt fiber, 3 parts of early strength agent and 10 parts of silica fume. Mix the raw materials evenly, keep warm for 60 s under the conditions of a steam temperature of 130 °C and a pressure of 0.5 MPa, then cool down to 85 °C, press for 6 h, soak in the treatment liquid for 5 min, take out until no liquid drips, irradiate with 365 nm ultraviolet light for 40 s, spray glutaraldehyde on the surface, and keep warm at 60 °C for 10 h to obtain a waterproof and heat-insulating homogeneous board.

[0054] The dosage ratio of the basalt fiber and the hydrochloric acid solution described in Step A1 is 1 g:15 mL, the mass fraction of the hydrochloric acid solution is 4%, and the dosage of 3-mercaptopropyltriethoxysilane is 1% of the mass of the pretreated fiber.

[0055] The dosage ratio of octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane and deionized water described in Step A2 is 2.5 mol:1.3 mol:1 mol:4 mol:6 mol:5 L, and the mass ratio of polysiloxane, benzophenone and N,N-dimethylacetamide is 1:0.05:8.

[0056] The Portland cement model described in Step A3 is PO42.5, the early strength agent is calcium formate, and the particle size of the silica fume is 0.2 μm.

[0057] The modified polystyrene described above is made by the following steps:

[0058] Step B1: Mix N-hydroxyphthalimide, copper chloride, sodium hypochlorite and deionized water evenly, stir and add bamboo cellulose under the conditions of a rotation speed of 200 r / min and a temperature of 75 °C, carry out a reaction for 3 h, filter to remove the filtrate to obtain carboxylated bamboo fiber. Mix the carboxylated bamboo fiber, 3-aminopropyltriethoxysilane, dicyclohexylcarbodiimide and toluene, introduce nitrogen for protection, and carry out a reaction for 3 h under the conditions of a rotation speed of 300 r / min and a temperature of 30 °C to obtain modified cellulose;

[0059] Step B2: Mix the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, and ethanol evenly. Under the conditions of a rotation speed of 150 r / min and a temperature of 70 °C, stir and add deionized water and hydrochloric acid, and react for 3 h. Then, raise the temperature to 130 °C and continue to react for 5 h to obtain a precursor.

[0060] Step B3: Mix fumaric acid, octadecylamine, dicyclohexylcarbodiimide, and toluene, and introduce nitrogen protection. Under the conditions of a rotation speed of 300 r / min and a temperature of 30 °C, react for 1.5 h to obtain a modified monomer. Mix styrene, the modified monomer, pentane, and the precursor evenly. Under the conditions of a rotation speed of 150 r / min and a temperature of 85 °C, stir and add potassium persulfate, and react for 5 h to obtain modified polystyrene.

[0061] The dosage ratio of N-hydroxyphthalimide, copper chloride, sodium hypochlorite, deionized water, and bamboo cellulose described in Step B1 is 3 mmol: 3 mmol: 14 mmol: 30 mL: 1.5 g, and the molar ratio of the carboxyl group on the carboxylated bamboo fiber, 3-aminopropyltriethoxysilane, and dicyclohexylcarbodiimide is 1: 1: 1.1.

[0062] The dosage ratio of the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, ethanol, deionized water, and hydrochloric acid described in Step B2 is 1 g: 1 mL: 2 mL: 1 mL: 30 mL: 3 mL: 1 mL, and the mass fraction of hydrochloric acid is 5%.

[0063] The molar ratio of fumaric acid, octadecylamine, and dicyclohexylcarbodiimide described in Step B3 is 1: 2: 2.1, the mass ratio of styrene, the modified monomer, pentane, and the precursor is 60: 15: 10: 2, and the dosage of potassium persulfate is 1% of the sum of the masses of styrene and the modified monomer.

[0064] Comparative Example 1: This comparative example is the same as Example 1 except that glutaraldehyde is not sprayed.

[0065] Comparative Example 2: This comparative example is the same as Example 1 except that it is not soaked in the treatment liquid.

[0066] Comparative Example 3: This comparative example is the same as Example 1 except that basalt fibers are used instead of modified basalt fibers.

[0067] Comparative Example 4: This comparative example is the same as Example 1 except that bamboo fibers are used instead of the precursor.

[0068] Comparative Example 5: This comparative example is the same as Example 1 except that the modified monomer is not added.

[0069] The homogeneous boards prepared in Examples 1-3 and Comparative Examples 1-5 were tested for thermal conductivity in accordance with the standard of GB / T 10294-2008, with the specimen thickness being 20 mm, and for volume water absorption in accordance with the standard of GB / T 5486-2008. The test results are shown in Table 1 below.

[0070] Table 1

[0071] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Thermal conductivity W / (m·k) 0.017 0.023 0.019 0.028 0.036 0.019 0.024 0.017 Volume water absorption rate % 3.1 3.8 3.3 8.4 13.5 5.1 6.4 5.8

[0072] As can be seen from Table 1 above, the present application has good waterproof and heat insulation effects.

[0073] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the specific embodiments described, or use similar methods for substitution, as long as they do not deviate from the concept of the invention or exceed the scope defined by the claims of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a waterproof and heat-insulating homogeneous board, characterized in that: The specific steps include: Step A1: After mixing and stirring basalt fiber and hydrochloric acid solution, filtering to remove filtrate, and then washing with deionized water until neutral to obtain pretreated fiber, the pretreated fiber is dispersed in ethanol, stirred and 3-mercaptopropyltriethoxysilane and deionized water are added to react to obtain modified basalt fiber; Step A2: octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane, deionized water and dimethyl sulfoxide are mixed, nitrogen is introduced for protection, and a reaction is carried out to obtain polysiloxane, and the polysiloxane, benzophenone and N,N-dimethylacetamide are mixed to obtain a treatment solution; Step A3: weigh the following raw materials in parts by weight: 80-100 parts of silicate cement, 40-50 parts of modified polystyrene, 5-8 parts of modified basalt fiber, 1.5-3 parts of early strength agent and 5-10 parts of silica fume, mix the raw materials evenly, press them under high temperature and high pressure, immerse them in a treatment liquid, immerse them until no liquid drips, irradiate them with 365nm ultraviolet light, spray glutaraldehyde on the surface, and perform heat preservation treatment to obtain a waterproof and heat-insulating homogeneous board; The modified polystyrene is prepared by the following steps: Step B1: N-hydroxyphthalimide, copper chloride, sodium hypochlorite and deionized water are mixed and stirred and added to bamboo cellulose to react, and the filtrate is filtered to remove the filtrate to obtain carboxylated bamboo fiber; carboxylated bamboo fiber, 3-aminopropyltriethoxysilane, dicyclohexylcarbodiimide and toluene are mixed, nitrogen is introduced for protection, and the reaction is carried out to obtain modified cellulose; Step B2: mixing and stirring the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane and ethanol, and adding deionized water and hydrochloric acid to react to obtain a precursor; Step B3: Mix fumaric acid, octadecylamine, dicyclohexylcarbodiimide and toluene, introduce nitrogen protection, and react to obtain a modified monomer; mix styrene, the modified monomer, pentane and a precursor to react to obtain a modified polystyrene.

2. The method for preparing a waterproof and heat-insulating homogeneous board according to claim 1, characterized in that: The dosage ratio of the basalt fiber and the hydrochloric acid solution described in step A1 is 1 g:15 mL, and the dosage of 3-mercaptopropyltriethoxysilane is 1% of the mass of the pretreated fiber.

3. The method for preparing a waterproof and heat-insulating homogeneous board according to claim 1, characterized in that: The amount ratio of octamethylcyclotetrasiloxane, methyltrifluoropropylcyclotrisiloxane, (3-aminopropyl)diethoxyethylsilane, tetramethylammonium hydroxide, tetramethyldivinyldisiloxane and deionized water described in step A2 is 2.5mol:1.3mol:1mol:4mol:6mol:5L, and the mass ratio of polysiloxane, benzophenone and N,N-dimethylacetamide is 1:0.05:

8.

4. The method for preparing a waterproof and heat-insulating homogeneous board according to claim 1, characterized in that: The amount ratio of N-hydroxyphthalimide, cupric chloride, sodium hypochlorite, deionized water and bamboo cellulose described in step B1 is 3mmol:3mmol:14mmol:30mL:1.5g, and the molar ratio of carboxyl groups on carboxylated bamboo fibers, 3-aminopropyltriethoxysilane and dicyclohexylcarbodiimide is 1:1:1.

1.

5. The method for preparing a waterproof and heat-insulating homogeneous board according to claim 1, characterized in that: The amount ratio of the modified cellulose, dimethyldiethoxysilane, phenyltriethoxysilane, 3-mercaptopropyltriethoxysilane, ethanol, deionized water and hydrochloric acid described in step B2 is 1g:1mL:2mL:1mL:30mL:3mL:1mL.

6. The method for preparing a waterproof and heat-insulating homogeneous board according to claim 1, characterized in that: The molar ratio of fumaric acid, octadecylamine and dicyclohexylcarbodiimide in step B3 is 1:2:2.1, and the mass ratio of styrene, modified monomer, pentane and precursor is 50-60:10-15:8-10:1-2.