Rock wool high-strength core material and preparation method thereof

Abstract

The invention relates to the technical field of thermal insulation materials, in particular to a rock wool high-strength core material and a preparation method thereof.In order to improve the strength of the rock wool core material, epoxy resin is used as an adhesive of a rock wool board, the epoxy resin is subjected to modification treatment, an epoxy monomer containing fluorine is prepared, and the core material is prepared; the water-resistant agent is added into an epoxy resin glue solution, so that the water-resistant performance of the material is effectively improved, and the adsorption of the insulation board on water vapor in humid weather is avoided; meanwhile, the cement mortar protective layer of the rock wool core material is modified, latex is introduced to provide certain bending performance for the cement mortar protective layer, the structure of the core material is improved, the core material is cut, and the mode that the cement mortar protective layer on one side is connected is reserved, so that the bending performance of the core material is achieved; and the use performance of the core material is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation materials, in particular to a high-strength rock wool core material and a preparation method thereof. Background Art

[0002] Rock wool core material is a core material made of natural rock, which is heated and melted into fibers and then bonded together. It has excellent properties of thermal insulation, sound insulation and flame retardancy, and is widely used in the field of thermal insulation of buildings. However, rock wool boards have low tensile strength and poor water vapor resistance. Currently, the industry often uses cement mortar to form a core material structure to strengthen the rock wool core material and avoid damage to the rock wool core material. However, cement mortar materials have poor bending strength and are easy to peel off, which often causes damage to the sandwich structure. Summary of the invention

[0003] The object of the present invention is to provide a high-strength rock wool core material and a preparation method thereof, so as to solve the problems raised in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: a high-strength rock wool core material, comprising a rock wool insulation layer and a cement solidified layer cement mortar protective layer coated on one side of the rock wool insulation layer;

[0005] Wherein, the cement mortar protective layer also contains glass fiber mesh cloth;

[0006] Furthermore, the rock wool insulation layer is formed by mixing rock wool fibers and modified epoxy resin glue and curing them at high temperature and high pressure;

[0007] The added amount of the modified epoxy resin adhesive is 75-120kg / ton of fiber.

[0008] Furthermore, the modified epoxy resin glue is composed of 10 parts of epoxy resin, 1-3 parts of fluorine-modified epoxy resin, 0.6-1.2 parts of diluent, 2.9-4.1 parts of curing agent and 8-12 parts of deionized water in parts by weight;

[0009] Wherein, the epoxy resin is any one of E51 and E44 epoxy resins;

[0010] The diluent is any one or more of acetone, ethyl acetate, and anhydrous ethanol;

[0011] The curing agent is EN71-9 aromatic amine.

[0012] Furthermore, the preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0013] a. Disperse tricarboxylic acid in DMF, mix well, add benzenesulfonic acid, continue mixing for 15-30 minutes, and let stand to obtain a dispersion of tricarboxylic acid;

[0014] Disperse 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 2-4 hours. During the addition, maintain the temperature of the reaction system at 100-150°C. After the addition is completed, continue to stir the reaction for 1-3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate;

[0015] b. Disperse the three-arm intermediate in DMF, heat to 75°C under a nitrogen atmosphere, stir and disperse, add epichlorohydrin, stir and mix evenly, heat to 98-105°C, slowly drop sodium hydroxide solution therein for 0.5-0.75h. After the addition is completed, continue stirring and react for 3-5h, remove excess solvent and unreacted epichlorohydrin by reduced pressure distillation, wash the resulting product with deionized water at 0-4°C for 2-3 times, and dry to constant weight to obtain fluorine-modified epoxy resin.

[0016] Furthermore, in step a, the mass ratio of tricarbamic acid, benzenesulfonic acid and 4,4'-(hexafluoroisopropylidene)bisphenol is 1:(0.05-0.09):(4.5-5.9).

[0017] Furthermore, in step b, the mass ratio of the three-arm intermediate, epichlorohydrin and sodium hydroxide is 1:(0.51-0.84):0.05.

[0018] Furthermore, a method for preparing a high-strength rock wool core material comprises the following steps:

[0019] S1. Preparing modified epoxy resin glue;

[0020] Mix epoxy resin, fluorine-modified epoxy resin, diluent, curing agent and deionized water, add ammonia water to adjust the pH value of the solution to 7.2-7.5, stir at high speed for emulsification, control the temperature of the mixed system to 30-70°C during the emulsification process, and obtain modified epoxy resin glue after the emulsification is completed;

[0021] S2. Preparation of rock wool insulation layer;

[0022] The modified epoxy resin glue is sprayed on the surface of the rock wool fiber. After the spraying is completed, the rock wool fibers are collected, stacked, and hot-pressed to obtain a rock wool insulation layer.

[0023] S3. Preparation of high-strength rock wool core material;

[0024] S31. Mix cement, river sand, cellulose, latex and water, mix well to form a fluid slurry, add hydrogen peroxide thereto, stir at high speed for 15-30s to obtain cement slurry;

[0025] S32. Apply a layer of cement slurry to the surface of one side of the rock wool insulation layer prepared in step S2, lay a layer of glass fiber mesh cloth on the surface of the cement slurry, apply another layer of cement slurry, shake it evenly, place it in a curing room, take it out after curing for 3 days, dry it to constant weight, and cut the side of the rock wool insulation layer not covered by the cement mortar protective layer. Stop cutting after the cutting depth reaches the cement mortar protective layer, blow off the cutting debris, and obtain the rock wool high-strength core material.

[0026] Furthermore, in step S2, during hot pressing curing, the pressure is 0.03-0.05 MPa, the temperature is 170-185° C., and the hot pressing time is 1-2 h.

[0027] Furthermore, in step S3, the cement slurry is composed of 2-2.5 parts of cement, 3-4 parts of river sand, 0.0005-0.001 parts of cellulose, 0.8-1.1 parts of latex and 0.5-0.8 parts of water.

[0028] Furthermore, in step S3, the curing temperature in the curing room is 20-25° C., and the relative humidity is 75-100%.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In order to improve the strength of the rock wool core material, the present invention uses epoxy resin as the adhesive of the rock wool board. Compared with conventional phenolic resin, epoxy resin has stronger bonding performance and can effectively improve the strength of the rock wool board. In order to improve the water resistance of the rock wool board, the present invention also modifies the epoxy resin. By using tricarboxylic acid and 4,4'-(hexafluoroisopropylidene)bisphenol as raw materials and controlling the reaction conditions, a three-arm intermediate with a three-arm structure capped with a phenolic group is prepared, which is then mixed with epichlorohydrin in an alkaline environment to finally prepare an epoxy monomer containing fluorine element. Adding it to the epoxy resin glue can effectively improve the water resistance of the material, avoid the absorption of water vapor by the insulation board in humid weather, and avoid the problem of decreased thermal insulation performance of the rock wool core material.

[0031] In addition, the present invention also modifies the cement mortar protective layer on the surface of the rock wool core material, by introducing cellulose and hydrogen peroxide foaming therein, thereby reducing the unit volume weight of the core material, and the introduced latex can also effectively provide a certain bending performance for the cement mortar protective layer, thereby avoiding the transition peeling of the cement mortar protective layer caused by bending;

[0032] At the same time, in order to improve the construction performance of the rock wool core material, the present invention also improves its structure. By cutting it and retaining only a single-side cement mortar protective layer connected, the bendability of the core material is achieved, the degree of fit of the core material to the building main body during the processing and construction process is increased, and the performance of the core material is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a display diagram of the finished product of the rock wool high-strength core material of the present invention; Figure 2 This is a diagram showing the finished high-strength rock wool core material of the present invention after bending. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in 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.

[0036] The epoxy resin used in the examples and comparative examples of the present application is E51 type epoxy resin;

[0037] Embodiment 1. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0038] S1. Preparing modified epoxy resin glue;

[0039] Mix 10 parts of epoxy resin, 1 part of fluorine-modified epoxy resin, 0.9 parts of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water by weight, add ammonia water to adjust the pH value of the solution to 7.5, stir at high speed for emulsification, control the temperature of the mixed system at 55-70° C. during the emulsification process, and obtain a modified epoxy resin glue after the emulsification is completed;

[0040] The preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0041] a. In parts by weight, 1 part of tricarboxylic acid was dispersed in DMF, mixed evenly, 0.05 parts of benzenesulfonic acid was added, and mixing was continued for 30 minutes, and then allowed to stand to obtain a dispersion of tricarboxylic acid;

[0042] Disperse 4.5 parts of 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 3 hours. During the addition, maintain the temperature of the reaction system at 120°C. After the addition is completed, continue to stir the reaction for 3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate.

[0043] b. Disperse 1 part of the three-arm intermediate in DMF by weight, heat to 75°C under a nitrogen atmosphere, stir and disperse, add 0.51 parts of epichlorohydrin, stir and mix evenly, heat to 102°C, slowly dropwise add a sodium hydroxide solution containing 0.05 parts of sodium hydroxide, and add for 0.75h. After the addition is completed, continue to stir and react for 4h, remove excess solvent and unreacted epichlorohydrin by distillation under reduced pressure, wash the resulting product 3 times with deionized water at a temperature of 0-4°C, and dry to constant weight to obtain a fluorine-modified epoxy resin;

[0044] S2. Preparation of rock wool insulation layer;

[0045] The modified epoxy resin glue is sprayed on the surface of the rock wool fiber, and the spraying amount is 80kg / ton fiber. After the spraying is completed, the rock wool fibers are collected, stacked and hot-pressed for curing. The hot-pressing pressure is 0.04MPa, the hot-pressing temperature is 180°C, and the hot-pressing time is 2h. After the hot-pressing is completed, a rock wool insulation layer is obtained;

[0046] S3. Preparation of high-strength rock wool core material;

[0047] S31. By weight, 2 parts of cement, 3 parts of river sand, 0.005 parts of cellulose, 1 part of latex and 0.5 parts of water were mixed, and after mixing evenly to form a fluid slurry, 0.5 parts of hydrogen peroxide was added thereto, and stirred at high speed for 30 seconds to obtain a cement slurry;

[0048] S32. Apply a layer of cement slurry to the surface of one side of the rock wool insulation layer prepared in step S2, lay a layer of glass fiber mesh cloth on the surface of the cement slurry, apply another layer of cement slurry, shake it evenly, place it in a curing room, set the curing temperature to 25°C, and the curing humidity to 75%. After curing for 3 days, dry it to constant weight, cut the side of the rock wool insulation layer not covered by the cement mortar protective layer, stop cutting after the cutting depth reaches the cement mortar protective layer, blow away the cutting debris, and obtain the rock wool high-strength core material.

[0049] Embodiment 2. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0050] Compared with Example 1, this embodiment increases the amount of fluorine-modified epoxy resin glue added in step S1;

[0051] S1. Preparing modified epoxy resin glue;

[0052] Mix 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 parts of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water by weight, add ammonia water to adjust the pH value of the solution to 7.5, stir at high speed for emulsification, control the temperature of the mixed system to 55-70° C. during the emulsification process, and obtain a modified epoxy resin glue after the emulsification is completed;

[0053] The preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0054] a. In parts by weight, 1 part of tricarboxylic acid was dispersed in DMF, mixed evenly, 0.05 parts of benzenesulfonic acid was added, and mixing was continued for 30 minutes, and then allowed to stand to obtain a dispersion of tricarboxylic acid;

[0055] Disperse 4.5 parts of 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 3 hours. During the addition, maintain the temperature of the reaction system at 120°C. After the addition is completed, continue to stir the reaction for 3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate.

[0056] b. Disperse 1 part of the three-arm intermediate in DMF by weight, heat to 75°C under a nitrogen atmosphere, stir and disperse, add 0.51 parts of epichlorohydrin, stir and mix evenly, heat to 102°C, slowly dropwise add a sodium hydroxide solution containing 0.05 parts of sodium hydroxide, and the dropping time is 0.75h. After the dropping is completed, continue to stir and react for 4h, remove excess solvent and unreacted epichlorohydrin by reduced pressure distillation, wash the resulting product with deionized water at a temperature of 0-4°C for 3 times, and dry to constant weight to obtain a fluorine-modified epoxy resin.

[0057] Embodiment 3. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0058] Compared with Example 2, this example increases the amount of 4,4'-(hexafluoroisopropylidene)bisphenol added in step a;

[0059] S1. Preparing modified epoxy resin glue;

[0060] Mix 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 parts of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water by weight, add ammonia water to adjust the pH value of the solution to 7.5, stir at high speed for emulsification, control the temperature of the mixed system to 55-70° C. during the emulsification process, and obtain a modified epoxy resin glue after the emulsification is completed;

[0061] The preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0062] a. In parts by weight, 1 part of tricarboxylic acid was dispersed in DMF, mixed evenly, 0.05 parts of benzenesulfonic acid was added, and mixing was continued for 30 minutes, and then allowed to stand to obtain a dispersion of tricarboxylic acid;

[0063] Disperse 5.9 parts of 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 3 hours. During the addition, maintain the temperature of the reaction system at 120°C. After the addition is completed, continue to stir the reaction for 3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate.

[0064] b. Disperse 1 part of the three-arm intermediate in DMF by weight, heat to 75°C under a nitrogen atmosphere, stir and disperse, add 0.51 parts of epichlorohydrin, stir and mix evenly, heat to 102°C, slowly dropwise add a sodium hydroxide solution containing 0.05 parts of sodium hydroxide, and the dropping time is 0.75h. After the dropping is completed, continue to stir and react for 4h, remove excess solvent and unreacted epichlorohydrin by reduced pressure distillation, wash the resulting product with deionized water at a temperature of 0-4°C for 3 times, and dry to constant weight to obtain a fluorine-modified epoxy resin.

[0065] Embodiment 4. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0066] Compared with Example 3, this example increases the amount of epichlorohydrin added in step b;

[0067] S1. Preparing modified epoxy resin glue;

[0068] Mix 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 parts of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water by weight, add ammonia water to adjust the pH value of the solution to 7.5, stir at high speed for emulsification, control the temperature of the mixed system to 55-70° C. during the emulsification process, and obtain a modified epoxy resin glue after the emulsification is completed;

[0069] The preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0070] a. In parts by weight, 1 part of tricarboxylic acid was dispersed in DMF, mixed evenly, 0.05 parts of benzenesulfonic acid was added, and mixing was continued for 30 minutes, and then allowed to stand to obtain a dispersion of tricarboxylic acid;

[0071] Disperse 5.9 parts of 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 3 hours. During the addition, maintain the temperature of the reaction system at 120°C. After the addition is completed, continue to stir the reaction for 3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate.

[0072] b. Disperse 1 part of the three-arm intermediate in DMF by weight, heat to 75°C under a nitrogen atmosphere, stir and disperse, add 0.84 parts of epichlorohydrin, stir and mix evenly, heat to 102°C, slowly dropwise add a sodium hydroxide solution containing 0.05 parts of sodium hydroxide, and add for 0.75h. After the addition is completed, continue to stir and react for 4h, remove excess solvent and unreacted epichlorohydrin by distillation under reduced pressure, wash the resulting product 3 times with deionized water at a temperature of 0-4°C, and dry to constant weight to obtain a fluorine-modified epoxy resin;

[0073] S2. Preparation of rock wool insulation layer;

[0074] Modified epoxy resin glue is sprayed on the surface of the rock wool fiber with a spraying amount of 80kg / ton of fiber. After the spraying is completed, the rock wool fibers are collected, stacked and hot-pressed for curing. The hot-pressing pressure is 0.04MPa, the hot-pressing temperature is 180℃, and the hot-pressing time is 2h. After the hot-pressing is completed, a rock wool insulation layer is obtained.

[0075] Embodiment 5. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0076] Compared with Example 4, this embodiment increases the amount of modified epoxy resin glue added in step S2;

[0077] S1. Preparing modified epoxy resin glue;

[0078] Mix 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 parts of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water by weight, add ammonia water to adjust the pH value of the solution to 7.5, stir at high speed for emulsification, control the temperature of the mixed system to 55-70° C. during the emulsification process, and obtain a modified epoxy resin glue after the emulsification is completed;

[0079] The preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0080] a. In parts by weight, 1 part of tricarboxylic acid was dispersed in DMF, mixed evenly, 0.05 parts of benzenesulfonic acid was added, and mixing was continued for 30 minutes, and then allowed to stand to obtain a dispersion of tricarboxylic acid;

[0081] Disperse 5.9 parts of 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 3 hours. During the addition, maintain the temperature of the reaction system at 120°C. After the addition is completed, continue to stir the reaction for 3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate.

[0082] b. Disperse 1 part of the three-arm intermediate in DMF by weight, heat to 75°C under a nitrogen atmosphere, stir and disperse, add 0.84 parts of epichlorohydrin, stir and mix evenly, heat to 102°C, slowly dropwise add a sodium hydroxide solution containing 0.05 parts of sodium hydroxide, and add for 0.75h. After the addition is completed, continue to stir and react for 4h, remove excess solvent and unreacted epichlorohydrin by distillation under reduced pressure, wash the resulting product 3 times with deionized water at a temperature of 0-4°C, and dry to constant weight to obtain a fluorine-modified epoxy resin;

[0083] S2. Preparation of rock wool insulation layer;

[0084] Modified epoxy resin glue is sprayed on the surface of the rock wool fiber, with a spraying amount of 120kg / ton of fiber. After the spraying is completed, the rock wool fibers are collected, stacked and hot-pressed for curing. The hot-pressing pressure is 0.04MPa, the hot-pressing temperature is 180℃, and the hot-pressing time is 2h. After the hot-pressing is completed, a rock wool insulation layer is obtained.

[0085] Comparative Example 1. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0086] Compared with Example 1, this example does not add fluorine-modified epoxy resin to prepare;

[0087] S1. Preparing modified epoxy resin glue;

[0088] Mix 10 parts of epoxy resin, 0.9 parts of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water by weight, add ammonia water to adjust the pH value of the solution to 7.5, stir at high speed for emulsification, control the temperature of the mixed system at 55-70°C during the emulsification process, and obtain a modified epoxy resin glue after the emulsification is completed;

[0089] S2. Preparation of rock wool insulation layer;

[0090] The modified epoxy resin glue is sprayed on the surface of the rock wool fiber, and the spraying amount is 80kg / ton fiber. After the spraying is completed, the rock wool fibers are collected, stacked and hot-pressed for curing. The hot-pressing pressure is 0.04MPa, the hot-pressing temperature is 180°C, and the hot-pressing time is 2h. After the hot-pressing is completed, a rock wool insulation layer is obtained;

[0091] S3. Preparation of high-strength rock wool core material;

[0092] S31. By weight, 2 parts of cement, 3 parts of river sand, 0.005 parts of cellulose, 1 part of latex and 0.5 parts of water were mixed, and after mixing evenly to form a fluid slurry, 0.5 parts of hydrogen peroxide was added thereto, and stirred at high speed for 30 seconds to obtain a cement slurry;

[0093] S32. Apply a layer of cement slurry to the surface of one side of the rock wool insulation layer prepared in step S2, lay a layer of glass fiber mesh cloth on the surface of the cement slurry, apply another layer of cement slurry, shake it evenly, place it in a curing room, set the curing temperature to 25°C, and the curing humidity to 75%. After curing for 3 days, dry it to constant weight, cut the side of the rock wool insulation layer not covered by the cement mortar protective layer, stop cutting after the cutting depth reaches the cement mortar protective layer, blow away the cutting debris, and obtain the rock wool high-strength core material.

[0094] Detection:

[0095] The rock wool insulation layer prepared in step S2 of Examples 1-5 and Comparative Example 1 was prepared as a test sample, and the volume water absorption of the rock wool core material was tested according to GB / T5480-2017; and the tensile strength was tested according to GB / T30804-2014;

[0096] The rock wool insulation layer prepared in step S2 of Examples 1-5 and Comparative Example 1 was prepared as a test sample, without coating cement slurry on its surface, and placed at a temperature of 25° C. and a relative humidity of 100%. After being placed for 7 days, its tensile strength was tested again;

[0097]

[0098] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high-strength rock wool core material, characterized in that: The rock wool high-strength core material is composed of a rock wool insulation layer and a cement solidified layer cement mortar protective layer coated on one side of the rock wool insulation layer; Wherein, the cement mortar protective layer also contains glass fiber mesh cloth; The rock wool insulation layer is formed by mixing rock wool fibers and modified epoxy resin glue and curing them at high temperature and high pressure; The added amount of the modified epoxy resin adhesive is 75-120kg / ton of fiber.

2. The high-strength rock wool core material according to claim 1, characterized in that: The modified epoxy resin glue is composed of 10 parts of epoxy resin, 1-3 parts of fluorine-modified epoxy resin, 0.6-1.2 parts of diluent, 2.9-4.1 parts of curing agent and 8-12 parts of deionized water in parts by weight; Wherein, the epoxy resin is any one of E51 and E44 epoxy resins; The diluent is any one or more of acetone, ethyl acetate, and anhydrous ethanol; The curing agent is EN71-9 aromatic amine.

3. The high-strength rock wool core material according to claim 2, characterized in that: The preparation method of the fluorine-modified epoxy resin comprises the following steps: a. Disperse tricarboxylic acid in DMF, mix well, add benzenesulfonic acid, continue mixing for 15-30 minutes, and let stand to obtain a dispersion of tricarboxylic acid; Disperse 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix well, and then uniformly add tricarboxylic acid dispersion thereto for 2-4 hours. During the addition, maintain the temperature of the reaction system at 100-150°C. After the addition is completed, continue to stir the reaction for 1-3 hours, stop heating, and remove excess solvent by rotary evaporation to obtain a three-arm intermediate; b. Disperse the three-arm intermediate in DMF, heat to 75°C under a nitrogen atmosphere, stir and disperse, add epichlorohydrin, stir and mix evenly, heat to 98-105°C, slowly drop sodium hydroxide solution therein for 0.5-0.75h. After the addition is completed, continue stirring and react for 3-5h, remove excess solvent and unreacted epichlorohydrin by reduced pressure distillation, wash the resulting product with deionized water at 0-4°C for 2-3 times, and dry to constant weight to obtain fluorine-modified epoxy resin.

4. The high-strength rock wool core material according to claim 3, characterized in that: In step a, the mass ratio of tricarballylic acid, benzenesulfonic acid and 4,4'-(hexafluoroisopropylidene)bisphenol is 1:(0.05-0.09):(4.5-5.9).

5. The high-strength rock wool core material according to claim 3, characterized in that: In step b, the mass ratio of the three-arm intermediate, epichlorohydrin and sodium hydroxide is 1:(0.51-0.84):0.

05.

6. A method for preparing a high-strength rock wool core material according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Preparing modified epoxy resin glue; Mix epoxy resin, fluorine-modified epoxy resin, diluent, curing agent and deionized water, add ammonia water to adjust the pH value of the solution to 7.2-7.5, stir at high speed for emulsification, control the temperature of the mixed system to 30-70°C during the emulsification process, and obtain modified epoxy resin glue after the emulsification is completed; S2. Preparation of rock wool insulation layer; The modified epoxy resin glue is sprayed on the surface of the rock wool fiber. After the spraying is completed, the rock wool fibers are collected, stacked, and hot-pressed to obtain a rock wool insulation layer. S3. Preparation of high-strength rock wool core material; S31. Mix cement, river sand, cellulose, latex and water to form a fluid slurry, add hydrogen peroxide thereto, and stir at high speed for 15-30 seconds to obtain a cement slurry; S32. Apply a layer of cement slurry to the surface of one side of the rock wool insulation layer prepared in step S2, lay a layer of glass fiber mesh cloth on the surface of the cement slurry, apply another layer of cement slurry, shake it evenly, place it in a curing room, take it out after curing for 3 days, dry it to constant weight, and cut the side of the rock wool insulation layer not covered by the cement mortar protective layer. Stop cutting after the cutting depth reaches the cement mortar protective layer, blow off the cutting debris, and obtain the rock wool high-strength core material.

7. The method for preparing a high-strength rock wool core material according to claim 6, characterized in that: In step S2, during hot pressing curing, the pressure is 0.03-0.05 MPa, the temperature is 170-185° C., and the hot pressing time is 1-2 h.

8. The method for preparing a high-strength rock wool core material according to claim 6, characterized in that: In step S3, the cement slurry consists of 2-2.5 parts of cement, 3-4 parts of river sand, 0.0005-0.001 parts of cellulose, 0.8-1.1 parts of latex and 0.5-0.8 parts of water.

9. The method for preparing a high-strength rock wool core material according to claim 6, characterized in that: In step S3, the curing temperature in the curing room is 20-25° C., and the relative humidity is 75-100%.

Images