Acrylic bathtub with fiber reinforced thermal insulation layer and preparation method of acrylic bathtub

Abstract

The invention relates to the field of sanitary products, and discloses an acrylic bathtub with a fiber reinforced heat preservation layer and a preparation method thereof.The acrylic bathtub comprises a forming bathtub body, an acrylic plate is bonded to the bottom of the edge of the upper end of the forming bathtub body, and a heat preservation reinforcing layer is arranged on the outer wall of the forming bathtub body; the thermal insulation reinforcing material comprises epoxy resin, modified basalt fiber, modified graphene oxide, a curing agent, a lubricant and an antioxidant, wherein the modified basalt fiber is prepared by reacting phosphorus oxychloride with bisphenol fluorene and then further grafting with carboxylated basalt fiber; the preparation method comprises the following steps: enabling phenyl tri (dimethyl siloxane) silane and glycidyl methacrylate to react, and further grafting with aminated graphene oxide treated by a silane coupling agent to prepare the modified graphene oxide. The modified basalt fiber, the modified graphene oxide and an epoxy resin matrix are compounded; the heat-preservation reinforcing layer has excellent mechanical property and flame retardant property, and is good in damp-heat aging resistance and heat-preservation and heat-insulation effects.

Description

Technical Field

[0001] The invention belongs to the technical field of bathroom products, and particularly relates to an acrylic bathtub with a fiber-reinforced thermal insulation layer and a preparation method thereof. Background Art

[0002] Bathtubs are a kind of bathroom product that people often come into contact with in daily life. Bathtubs are made of many kinds of materials, such as wood, cast iron, ceramic, acrylic, etc. Modern bathtubs are mostly made of acrylic or fiberglass. Among them, acrylic bathtubs have become one of the popular bathtub products in the bathroom market due to their material advantages and practicality.

[0003] As people's living standards improve, their requirements for the quality of daily necessities gradually increase. However, after the hot water is put into an ordinary acrylic bathtub, the water temperature will drop due to heat loss during the bathing process, which will reduce the comfort of bathing. It is necessary to continuously inject hot water to overflow the bathtub to increase the water temperature. The existing bathtub has poor thermal insulation effect. Especially in winter, when taking a bath, the water in the bathtub is easy to cool, which reduces the comfort of use. In order to maintain the temperature of the water, the existing bathtub uses fiber-reinforced resin insulation materials, but in a high temperature and high humidity environment, the aging of the insulation material is accelerated, resulting in particularly fast failure. In addition, because the fiber surface is very smooth and chemically inert, the interface adhesion between the fiber and the resin matrix is ​​poor. Therefore, during the deformation process, the weak interface layer is difficult to play the role of a bridge and transfer the load to the fiber, which is easy to cause stress concentration at the interface, and then cause defects such as interface debonding and stratification of the insulation material, which greatly reduces the mechanical properties of the insulation material. Summary of the invention

[0004] In order to solve the deficiencies mentioned in the above background technology, the purpose of the present invention is to provide an acrylic bathtub with a fiber-reinforced thermal insulation layer and a preparation method thereof, wherein a thermal insulation reinforcement material is prepared by compounding modified basalt fiber, modified graphene oxide and an epoxy resin matrix, and then bonding the composite material to the outer wall of a formed cylinder body, so that the prepared thermal insulation reinforcement layer has excellent mechanical properties and flame retardant properties, and has good resistance to moisture and heat aging and thermal insulation effects.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An acrylic bathtub with a fiber-reinforced thermal insulation layer comprises a formed cylinder body, an acrylic plate is bonded to the bottom of the upper edge of the formed cylinder body, and a thermal insulation reinforcement layer is provided on the outer wall of the formed cylinder body, the thermal insulation reinforcement layer is made of a thermal insulation reinforcement material bonded to the outer wall of the formed cylinder body, and the thermal insulation reinforcement material comprises the following raw materials in parts by weight: 45-70 parts of epoxy resin, 5-10 parts of modified basalt fiber, 10-15 parts of modified graphene oxide, 4-7 parts of curing agent, 0.5-5 parts of lubricant, and 0.1-1 parts of antioxidant;

[0007] The modified basalt fiber is prepared by an esterification reaction between carboxylated basalt fiber treated with potassium persulfate and silver nitrate and a phosphorus-containing intermediate, wherein the phosphorus-containing intermediate is prepared by a grafting reaction between phosphorus oxychloride and bisphenol fluorene; the modified graphene oxide is prepared by a ring-opening reaction between amino graphene oxide treated with 3-aminopropyltriethoxysilane and epoxidized phenyltri(dimethylsiloxy)silane, wherein the epoxidized phenyltri(dimethylsiloxy)silane is prepared by a hydrosilylation reaction between phenyltri(dimethylsiloxy)silane and glycidyl methacrylate.

[0008] Preferably, the curing agent is one or more combinations of aliphatic amines, aromatic amines, and amide amines; the lubricant is one or more combinations of polyethylene wax, oxidized polyethylene wax, and microcrystalline wax; and the antioxidant is one or more combinations of antioxidant 3114, antioxidant 1010, and antioxidant 1076.

[0009] Preferably, the method for preparing the modified basalt fiber comprises the following steps:

[0010] A. immersing the basalt fiber in a reactor filled with acetone solvent, heating and reflux at 50-75° C. for 6-8 hours, then taking it out, washing it, and drying it to prepare the pretreated basalt fiber;

[0011] B. Potassium persulfate is added to silver nitrate aqueous solution and mixed evenly, and then the pretreated basalt fiber is added, and the mixture is stirred at 60-80° C. for 2-5 hours. After the reaction is completed, the mixture is washed and dried to prepare carboxylated basalt fiber;

[0012] C. Take bisphenol fluorene and triethylamine in a reactor, add dichloromethane and stir to dissolve, then add phosphorus oxychloride and stir to react for 8 to 10 hours. After the reaction is completed, purify and dry the solid product to prepare a phosphorus-containing intermediate;

[0013] D. Ultrasonic dispersion of carboxylated basalt fiber in N, N-dimethylformamide, drop concentrated sulfuric acid dehydrating agent, react at 70-85°C for 5-7h, then add phosphorus-containing intermediate, heat to 110-125°C and continue to react for 3-5h. After the reaction is completed, centrifuge, wash and dry to prepare modified basalt fiber.

[0014] Preferably, in step C, the mass ratio of bisphenol fluorene to phosphorus oxychloride is 6.2-6.8:1.

[0015] Preferably, in step D, the mass ratio of the carboxylated basalt fiber to the phosphorus-containing intermediate is 1:0.2-0.5.

[0016] Preferably, the method for preparing the modified graphene oxide comprises the following steps:

[0017] (1) Phenyl tris(dimethylsiloxane) silane is placed in a reactor, heated to 105-115° C. with stirring, and kept warm for 20-30 min. Then, chloroplatinic acid catalyst and glycidyl methacrylate are added, and the reaction is carried out at a constant temperature for 3-4 h to prepare epoxidized phenyl tris(dimethylsiloxane) silane;

[0018] (2) ultrasonically dispersing graphene oxide in anhydrous ethanol, then adding 3-aminopropyltriethoxysilane and deionized water, reacting at 65-75° C. for 5-7 hours, and after the reaction is completed, centrifuging, washing, and drying to prepare amino-modified graphene oxide;

[0019] (3) Aminated graphene oxide, epoxidized phenyltri(dimethylsiloxy)silane and anhydrous ethanol are placed in a reactor, triethylenediamine catalyst is added, stirred and mixed, and reacted at 65-80° C. for 6-8 hours. After the reaction is completed, the modified graphene oxide is prepared by centrifugation, washing and drying.

[0020] Preferably, in step (1), the mass ratio of phenyltri(dimethylsiloxy)silane to glycidyl methacrylate is 1:1.3-1.5.

[0021] Preferably, in step (3), the mass ratio of the aminated graphene oxide to the epoxidized phenyltri(dimethylsiloxy)silane is 1:1-2.

[0022] Preferably, the method for preparing the thermal insulation reinforcement material comprises the following steps: taking parts by weight of epoxy resin, modified basalt fiber, modified graphene oxide, curing agent, lubricant and antioxidant and fully mixing them in a mixer to prepare the thermal insulation reinforcement material.

[0023] The method for preparing an acrylic bathtub with a fiber-reinforced thermal insulation layer as described above comprises the following steps: bonding an acrylic plate with a thickness of 10 to 13 mm to the bottom of the upper edge of a forming cylinder body, and then bonding a thermal insulation reinforcement material to the outer wall of the forming cylinder body, and curing and molding to prepare an acrylic bathtub with a fiber-reinforced thermal insulation layer.

[0024] Beneficial effects of the present invention:

[0025] The present invention first pre-treats basalt fibers to obtain basalt fibers with surface desizing, then uses potassium persulfate as an oxidant and silver nitrate as a catalyst to oxidize the surface of the pre-treated basalt fibers to prepare carboxylated basalt fibers, and simultaneously uses three chlorine atoms in a phosphorus oxychloride structure to carry out grafting reaction with one of the hydroxyl groups in a bisphenol fluorene structure to prepare a phosphorus-containing intermediate, which is then further esterified with the carboxylated basalt fibers to prepare modified basalt fibers. Among them, basalt fiber is a green, environmentally friendly, high-performance inorganic silicate fiber that can be sustainably utilized. The present invention combines the phosphorus-containing intermediate and the carboxylated basalt fiber through a strong chemical bond, which significantly improves the interface bonding strength between the basalt fiber and the epoxy resin matrix, is beneficial to the dispersion of the basalt fiber in the epoxy resin matrix, and makes its mechanical properties fully exerted. At the same time, the modified basalt fiber has a higher specific surface area, which makes the heat transfer path inside the material longer, thereby reducing thermal conductivity, reducing energy loss, and improving the thermal insulation effect of the material. The phosphorus element in the grafted phosphorus-containing intermediate can improve the flame retardant properties of the material to a certain extent. In addition, the introduced fluorene ring structure suppresses the thermal motion and internal rotation of the molecular chain segments, which can improve the heat resistance of the material.

[0026] The invention combines phenyl tri(dimethylsiloxane) silane and glycidyl methacrylate by using a hydrosilylation reaction to prepare epoxidized phenyl tri(dimethylsiloxane) silane, and simultaneously uses 3-aminopropyl triethoxysilane to perform amination treatment on graphene oxide, and then performs a ring-opening reaction on the epoxidized phenyl tri(dimethylsiloxane) silane and the amination graphene oxide to prepare modified graphene oxide, thereby introducing structures such as organic silicon and phenyl into the graphene oxide structure, thereby enhancing the mechanical properties and heat resistance of the material, increasing the interlayer spacing of the graphene oxide, making the path for corrosive media and moisture to reach a substrate to become tortuous, and improving the thermal insulation effect of the material, and further increasing the contact area between the graphene oxide and an epoxy resin matrix, thereby improving the compatibility between the graphene oxide and the epoxy resin matrix. The present invention prepares a thermal insulation reinforcement material by compounding modified basalt fiber, modified graphene oxide and an epoxy resin matrix, and then bonds the composite material to the outer wall of a formed cylinder body, so that the prepared thermal insulation reinforcement layer has excellent mechanical properties and flame retardant properties, and is resistant to moisture and heat aging and has good thermal insulation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic structural diagram of an acrylic bathtub with a fiber-reinforced thermal insulation layer according to the present invention;

[0029] Figure 2 It is an enlarged schematic diagram of the structure at location A of the present invention.

[0030] In the figure: 1-molding cylinder body, 2-acrylic plate, 3-thermal insulation reinforcement layer. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-2 As shown, an acrylic bathtub with a fiber-reinforced thermal insulation layer includes a molded cylinder body 1, an acrylic plate 2 is bonded to the bottom of the upper edge of the molded cylinder body 1, and the outer wall of the molded cylinder body 1 is provided with a thermal insulation reinforcement layer 3, and the thermal insulation reinforcement layer 3 is made of a thermal insulation reinforcement material bonded to the outer wall of the molded cylinder body 1.

[0033] Embodiment 1 A method for preparing modified basalt fiber comprises the following steps:

[0034] A. 10 g of basalt fiber was immersed in a reactor filled with acetone solvent, heated under reflux at 65° C. for 8 h, then taken out, cleaned and dried to prepare pretreated basalt fiber;

[0035] B. Take 3.4 g of potassium persulfate and add 0.002 g / mL of silver nitrate aqueous solution to mix evenly, then add the pretreated basalt fiber, place it at 70° C. and stir for 4 hours. After the reaction is completed, wash and dry to prepare carboxylated basalt fiber;

[0036] C. Take 6.5 g of bisphenol fluorene and 1 mL of triethylamine in a reactor, add 50 mL of dichloromethane and stir to dissolve, then add 1 g of phosphorus oxychloride and stir to react for 10 hours. After the reaction is completed, purify and dry the solid product to prepare a phosphorus-containing intermediate;

[0037] D. Take 1g of carboxylated basalt fiber and ultrasonically disperse it in 200mL of N,N-dimethylformamide, add concentrated sulfuric acid dehydrating agent, place it at 75℃ for reaction for 6h, then add 0.4g of phosphorus-containing intermediate, heat to 120℃ and continue to react for 5h. After the reaction is completed, centrifuge, wash and dry to prepare modified basalt fiber.

[0038] Embodiment 2 A method for preparing modified graphene oxide comprises the following steps:

[0039] (1) 16.5 g of phenyl tris(dimethylsiloxane) silane was placed in a reactor, heated to 110° C. with stirring, and kept warm for 30 min. Then, 100 uL of chloroplatinic acid catalyst and 23.1 g of glycidyl methacrylate were added, and the mixture was reacted at a constant temperature for 4 h to prepare epoxidized phenyl tris(dimethylsiloxane) silane;

[0040] (2) 1 g of graphene oxide was ultrasonically dispersed in 200 mL of anhydrous ethanol, and then 1 g of 3-aminopropyltriethoxysilane and 7 mL of deionized water were added, and the mixture was reacted at 70° C. for 6 h. After the reaction was completed, the mixture was centrifuged, washed, and dried to prepare amino-modified graphene oxide;

[0041] (3) 1 g of amino-modified graphene oxide, 1.2 g of epoxidized phenyl tri(dimethylsiloxy)silane and 100 mL of anhydrous ethanol were placed in a reactor, 0.002 g of triethylenediamine catalyst was added, stirred and mixed, and reacted at 75 ° C for 8 h. After the reaction was completed, the modified graphene oxide was prepared by centrifugation, washing and drying.

[0042] Example 3 A thermal insulation reinforcement material comprises the following raw materials in parts by weight: 48 parts of epoxy resin E-51, 5 parts of modified basalt fiber prepared in Example 1, 10 parts of modified graphene oxide prepared in Example 2, 4 parts of curing agent polyamide, 1 part of lubricant polyethylene wax, and 0.2 parts of antioxidant 3114.

[0043] The preparation method of the thermal insulation reinforcement material comprises the following steps: taking parts by weight of epoxy resin E-51, modified basalt fiber, modified graphene oxide, curing agent, lubricant and antioxidant in a mixer and fully mixing them to prepare the thermal insulation reinforcement material.

[0044] A method for preparing an acrylic bathtub with a fiber-reinforced thermal insulation layer comprises the following steps: bonding an acrylic plate with a thickness of 10 mm to the bottom of the upper edge of a forming cylinder body, bonding a thermal insulation reinforcement material to the outer wall of the forming cylinder body, and curing and molding to prepare an acrylic bathtub with a fiber-reinforced thermal insulation layer.

[0045] Example 4 A thermal insulation reinforcement material comprises the following raw materials in parts by weight: 60 parts of epoxy resin E-51, 7 parts of modified basalt fiber prepared in Example 1, 12 parts of modified graphene oxide prepared in Example 2, 5 parts of curing agent polyamide, 3 parts of lubricant polyethylene wax, and 0.5 parts of antioxidant 1010.

[0046] The preparation method of the above-mentioned thermal insulation reinforcement material and the acrylic bathtub with a fiber-reinforced thermal insulation layer is the same as that of Example 3.

[0047] Example 5 A thermal insulation reinforcement material comprises the following raw materials in parts by weight: 68 parts of epoxy resin E-51, 10 parts of modified basalt fiber prepared in Example 1, 14 parts of modified graphene oxide prepared in Example 2, 6 parts of curing agent polyamide, 4 parts of lubricant polyethylene wax, and 0.7 parts of antioxidant 1076.

[0048] The preparation method of the above-mentioned thermal insulation reinforcement material and the acrylic bathtub with a fiber-reinforced thermal insulation layer is the same as that of Example 3.

[0049] Comparative Example 1 A thermal insulation reinforcement material comprises the following raw materials in parts by weight: 68 parts of epoxy resin E-51, 10 parts of basalt fiber, 14 parts of modified graphene oxide prepared in Example 2, 6 parts of curing agent polyamide, 4 parts of lubricant polyethylene wax, and 0.7 parts of antioxidant 1076.

[0050] The preparation method of the above-mentioned thermal insulation reinforcement material and the acrylic bathtub with a fiber-reinforced thermal insulation layer is the same as that of Example 3.

[0051] Comparative Example 2 A thermal insulation reinforcement material includes the following raw materials in parts by weight: 68 parts of epoxy resin E-51, 10 parts of modified basalt fiber prepared in Example 1, 14 parts of graphene oxide, 6 parts of curing agent polyamide, 4 parts of lubricant polyethylene wax, and 0.7 parts of antioxidant 1076.

[0052] The preparation method of the above-mentioned thermal insulation reinforcement material and the acrylic bathtub with a fiber-reinforced thermal insulation layer is the same as that of Example 3.

[0053] Performance Testing

[0054] The thermal insulation reinforcement materials prepared in Examples 3-5 and Comparative Examples 1-2 were subjected to performance tests: tensile performance test was performed with reference to GB / T 1447-2005; bending performance test was performed with reference to GB / T 1449-2005; impact toughness test was performed with reference to GB / T 1451-2005; limiting oxygen index test was performed with reference to GB / T 2406.2-2009 to evaluate the flame retardant performance of the material; the thermal conductivity of the material at room temperature was tested using a TC3000E thermal conductivity meter, and the sample size was 30mm×40mm×15mm; the material was subjected to accelerated wet heat aging treatment using a constant temperature and humidity test chamber, the accelerated aging temperature was 80°C, the aging time was 28d, the relative humidity was 95%, the initial mass of the sample before aging was recorded as m0, and the mass after aging was recorded as m1, and the moisture absorption rate was calculated: η=(m1-m0) / m0×100%, and the data results are shown in Table 1.

[0055] Table 1 Test results of sample performance

[0056]

[0057] From the data in Table 1, it can be seen that the thermal insulation reinforcement materials prepared in Examples 3-5 of the present invention have excellent mechanical properties and flame retardant properties, and have good resistance to moisture and heat aging and thermal insulation effects. In Comparative Example 1, the basalt fiber was not modified, and its measured mechanical properties and oxygen index were lower than those of Example 3-5, and its thermal conductivity was higher than that of Example 3-5. The reason is that the phosphorus-containing intermediate was not grafted on the surface of the basalt fiber. In Comparative Example 2, graphene oxide was not modified, and its measured mechanical properties were lower than those of Example 3-5, and its thermal conductivity and moisture absorption rate were significantly higher than those of Example 3-5, indicating that the grafting of epoxidized phenyl tris (dimethylsiloxy) silane can improve the mechanical properties, moisture and heat aging resistance and thermal insulation effects of the material.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An acrylic bathtub with a fiber-reinforced thermal insulation layer, characterized in that: It comprises a forming cylinder body, an acrylic plate is bonded to the bottom of the upper edge of the forming cylinder body, and a thermal insulation reinforcement layer is provided on the outer wall of the forming cylinder body, the thermal insulation reinforcement layer is made of a thermal insulation reinforcement material bonded to the outer wall of the forming cylinder body, and the thermal insulation reinforcement material comprises the following raw materials in parts by weight: 45-70 parts of epoxy resin, 5-10 parts of modified basalt fiber, 10-15 parts of modified graphene oxide, 4-7 parts of curing agent, 0.5-5 parts of lubricant, and 0.1-1 parts of antioxidant; The modified basalt fiber is prepared by an esterification reaction between carboxylated basalt fiber treated with potassium persulfate and silver nitrate and a phosphorus-containing intermediate, wherein the phosphorus-containing intermediate is prepared by a grafting reaction between phosphorus oxychloride and bisphenol fluorene; the modified graphene oxide is prepared by a ring-opening reaction between amino graphene oxide treated with 3-aminopropyltriethoxysilane and epoxidized phenyltri(dimethylsiloxy)silane, wherein the epoxidized phenyltri(dimethylsiloxy)silane is prepared by a hydrosilylation reaction between phenyltri(dimethylsiloxy)silane and glycidyl methacrylate.

2. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 1, characterized in that: The curing agent is one or more combinations of aliphatic amines, aromatic amines, and amide amines; the lubricant is one or more combinations of polyethylene wax, oxidized polyethylene wax, and microcrystalline wax; the antioxidant is one or more combinations of antioxidant 3114, antioxidant 1010, and antioxidant 1076.

3. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 1, characterized in that: The preparation method of the modified basalt fiber comprises the following steps: A. immersing the basalt fiber in a reactor filled with acetone solvent, heating and reflux at 50-75° C. for 6-8 hours, then taking it out, washing it, and drying it to prepare the pretreated basalt fiber; B. Potassium persulfate is added to silver nitrate aqueous solution and mixed evenly, and then the pretreated basalt fiber is added, and the mixture is stirred at 60-80° C. for 2-5 hours. After the reaction is completed, the mixture is washed and dried to prepare carboxylated basalt fiber; C. Take bisphenol fluorene and triethylamine in a reactor, add dichloromethane and stir to dissolve, then add phosphorus oxychloride and stir to react for 8 to 10 hours. After the reaction is completed, purify and dry the solid product to prepare a phosphorus-containing intermediate; D. Ultrasonic dispersion of carboxylated basalt fiber in N, N-dimethylformamide, drop concentrated sulfuric acid dehydrating agent, react at 70-85°C for 5-7h, then add phosphorus-containing intermediate, heat to 110-125°C and continue to react for 3-5h. After the reaction is completed, centrifuge, wash and dry to prepare modified basalt fiber.

4. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 3, characterized in that: In the step C, the mass ratio of bisphenol fluorene to phosphorus oxychloride is 6.2-6.8:

1.

5. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 3, characterized in that: In the step D, the mass ratio of the carboxylated basalt fiber to the phosphorus-containing intermediate is 1:0.2-0.

5.

6. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 1, characterized in that: The preparation method of the modified graphene oxide comprises the following steps: (1) Phenyl tris(dimethylsiloxane) silane is placed in a reactor, heated to 105-115° C. with stirring, and kept warm for 20-30 min. Then, chloroplatinic acid catalyst and glycidyl methacrylate are added, and the reaction is carried out at a constant temperature for 3-4 h to prepare epoxidized phenyl tris(dimethylsiloxane) silane; (2) ultrasonically dispersing graphene oxide in anhydrous ethanol, then adding 3-aminopropyltriethoxysilane and deionized water, reacting at 65-75° C. for 5-7 hours, and after the reaction is completed, centrifuging, washing, and drying to prepare amino-modified graphene oxide; (3) Aminated graphene oxide, epoxidized phenyltri(dimethylsiloxy)silane and anhydrous ethanol are placed in a reactor, triethylenediamine catalyst is added, stirred and mixed, and reacted at 65-80° C. for 6-8 hours. After the reaction is completed, the modified graphene oxide is prepared by centrifugation, washing and drying.

7. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 6, characterized in that: In the step (1), the mass ratio of phenyltri(dimethylsiloxy)silane to glycidyl methacrylate is 1:1.3-1.

5.

8. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 6, characterized in that: In the step (3), the mass ratio of the aminated graphene oxide to the epoxidized phenyltri(dimethylsiloxy)silane is 1:1-2.

9. The acrylic bathtub with a fiber-reinforced thermal insulation layer according to claim 1, characterized in that: The preparation method of the thermal insulation reinforcement material comprises the following steps: taking parts by weight of epoxy resin, modified basalt fiber, modified graphene oxide, curing agent, lubricant and antioxidant and fully mixing them in a mixer to prepare the thermal insulation reinforcement material.

10. A method for preparing an acrylic bathtub with a fiber-reinforced thermal insulation layer according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: bonding an acrylic plate with a thickness of 10 to 13 mm to the bottom of the upper edge of a forming cylinder body, bonding a thermal insulation reinforcement material to the outer wall of the forming cylinder body, and curing and molding to prepare an acrylic bathtub with a fiber-reinforced thermal insulation layer.

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