A high-strength rock wool core material and its preparation method

Abstract

The present invention relates to the technical field of thermal insulation materials, specifically a high-strength rock wool core material and a preparation method thereof. In order to improve the strength of the rock wool core material, the present invention uses epoxy resin as the adhesive for the rock wool board and modifies the epoxy resin. By preparing an epoxy monomer containing fluorine elements and adding it to the epoxy resin glue solution, the water resistance of the material is effectively improved, and the adsorption of water vapor by the insulation board in humid weather is avoided. At the same time, the present invention also modifies the cement mortar protective layer of the rock wool core material. By introducing latex, a certain bending performance is provided for the cement mortar protective layer, and the core material structure is improved. By cutting it and only retaining the way of connecting the single-sided cement mortar protective layer, the bendability of the core material is realized, and the use performance of the core material is greatly improved.

Description

Technical Field

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

[0002] Rock wool core material is a core material formed by bonding fibers made from natural rock after heating and melting. It has excellent properties of heat insulation, sound insulation, and flame retardancy, and is widely used in the field of building thermal insulation. However, the tensile strength of rock wool boards is relatively low, and the water vapor resistance is poor. At present, in industry, cement mortar is often applied to form a core structure to strengthen the rock wool core material and prevent damage to the rock wool core material. However, the cement mortar material has poor flexural strength and is easy to peel off, often causing damage to the sandwich structure. Summary of the Invention

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

[0004] To achieve the above purpose, the present invention provides the following technical solution: A high-strength rock wool core material is composed of a rock wool thermal insulation layer and a cement mortar protective layer coated on one side of the rock wool thermal insulation layer;

[0005] Among them, the cement mortar protective layer also contains fiberglass mesh cloth;

[0006] Furthermore, the rock wool thermal insulation layer is formed by mixing rock wool fibers and a modified epoxy resin adhesive solution and curing them under high temperature and high pressure;

[0007] Among them, the addition amount of the modified epoxy resin adhesive solution is 75 - 120 kg per ton of fibers.

[0008] Furthermore, by weight, the modified epoxy resin adhesive solution 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;

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

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

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

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

[0013] a. Disperse tricarboxylic acid in DMF. After mixing evenly, add benzenesulfonic acid and continue to mix for 15 - 30 min. Then let it stand for later use to obtain a tricarboxylic acid dispersion.

[0014] Disperse 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF. After mixing evenly, slowly dropwise add the tricarboxylic acid dispersion to it at a constant rate within 2 - 4 h. During the dropping process, maintain the temperature of the reaction system at 100 - 150 °C. After the dropping is completed, continue to stir and react for 1 - 3 h, then stop heating. After rotary evaporation to remove the excess solvent, a three-armed intermediate is obtained.

[0015] b. Disperse the three-armed intermediate in DMF. Under a nitrogen atmosphere, heat it to 75 °C and stir to disperse. Then add epichlorohydrin and stir to mix evenly. Then heat it to 98 - 105 °C and slowly dropwise add a sodium hydroxide solution within 0.5 - 0.75 h. After the dropping is completed, continue to stir and react for 3 - 5 h. After vacuum distillation to remove the excess solvent and unreacted epichlorohydrin, wash the obtained product 2 - 3 times with deionized water at a temperature of 0 - 4 °C, and then dry it to a constant weight to obtain a fluorine-modified epoxy resin.

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

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

[0018] Further, a preparation method of a high-strength rock wool core material includes the following steps:

[0019] S1. Prepare a modified epoxy resin adhesive solution;

[0020] Mix epoxy resin, fluorine-modified epoxy resin, diluent, curing agent, and deionized water. After dropping ammonia water to adjust the pH value of the solution to 7.2 - 7.5, carry out high-speed stirring and emulsification. During the emulsification process, control the temperature of the mixed system at 30 - 70 °C. After the emulsification is completed, a modified epoxy resin adhesive solution is obtained.

[0021] S2. Prepare a rock wool insulation layer;

[0022] Spray the modified epoxy resin adhesive solution on the surface of rock wool fibers. After the spraying is completed, collect the rock wool fibers, stack them, and then hot-press and cure them to obtain a rock wool insulation layer.

[0023] S3. Prepare a high-strength rock wool core material;

[0024] S31. Mix cement, river sand, cellulose, latex and water. After mixing them evenly to form a fluid slurry, add hydrogen peroxide thereto. After high-speed stirring for 15 - 30 s, obtain a cement slurry.

[0025] S32. Coat one side surface of the rock wool insulation layer prepared in step S2 with a layer of cement slurry. Lay a layer of fiberglass mesh cloth on the surface of the cement slurry. Coat another layer of cement slurry again. After shaking evenly, place it in a curing room. After curing for 3 days, take it out. After drying to a constant weight, cut the side of the rock wool insulation layer without the cement mortar protective layer. Stop cutting when the cutting depth reaches the cement mortar protective layer. After purging the cutting debris, obtain the rock wool high-strength core material.

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

[0027] Further, 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 part of cellulose, 0.8 - 1.1 parts of latex and 0.5 - 0.8 part of water.

[0028] Further, 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 beneficial effects of the present invention are:

[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. Epoxy resin has stronger adhesion performance compared with conventional phenolic resin, which can effectively improve the strength of the rock wool board. And in order to improve the water resistance of the rock wool board, the present invention also conducts a modification treatment on the epoxy resin. By using glyceric acid and 4,4'-(hexafluoroisopropylidene)bisphenol as raw materials and controlling the reaction conditions, a three-arm intermediate with a phenolic group at the end and a three-arm structure is prepared. Then it is mixed with epichlorohydrin and in an alkaline environment, and finally an epoxy monomer containing fluorine element is prepared. Adding it to the epoxy resin glue can effectively improve the water resistance of the material, avoid the adsorption of water vapor by the insulation board in humid weather, and avoid the problem of the decline of the heat preservation performance of the rock wool core material;

[0031] And the present invention also conducts a modification treatment on the cement mortar protective layer on the surface of the rock wool core material. By introducing cellulose and hydrogen peroxide for foaming, the unit volume weight of the core material is reduced, and the introduced latex can also effectively provide a certain bending performance for the cement mortar protective layer, avoiding the excessive peeling of the cement mortar protective layer caused by bending;

[0032] Meanwhile, in order to improve the construction performance of the rock wool core material, the present invention also improves its structure. By cutting it and only retaining the way of connecting with the unilateral cement mortar protective layer, the bendability of the core material is realized, the degree of fitting of the core material to the building main body during the processing and construction process is increased, and the service performance of the core material is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The 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 to the present invention. In the drawings:

[0034] Figure 1 It is a display diagram of the finished product of the high-strength rock wool core material of the present invention;

[0035] Figure 2 It is a display diagram after the finished product of the high-strength rock wool core material of the present invention is bent. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] The epoxy resin used in the embodiments and comparative examples of the present application is E51 type epoxy resin;

[0038] Embodiment 1. A preparation method of a high-strength rock wool core material, comprising the following steps:

[0039] S1. Prepare a modified epoxy resin adhesive solution;

[0040] By weight, 10 parts of epoxy resin, 1 part of fluorine-modified epoxy resin, 0.9 part of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water are mixed. After dropping ammonia water to adjust the pH value of the solution to 7.5, it is emulsified by high-speed stirring. During the emulsification process, the temperature of the mixed system is controlled at 55-70 °C. After the emulsification is completed, a modified epoxy resin adhesive solution is obtained;

[0041] Among them, the preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0042] a. By weight, 1 part of citric acid is dispersed in DMF, and after mixing evenly, 0.05 part of benzenesulfonic acid is added, and after continuing to mix for 30 minutes, it is left standing for use to obtain a citric acid dispersion;

[0043] Disperse 4.5 parts of 4,4'-(hexafluoroisopropylidene)bisphenol into pure DMF, and after mixing evenly, slowly dropwise add the tricarboxylic acid dispersion thereto, with the dropping time being 3 h. During the dropping process, maintain the temperature of the reaction system at 120 °C. After the dropping is completed, continue to stir and react for 3 h, then stop heating. After rotary evaporation to remove the excess solvent, a three-arm intermediate is obtained;

[0044] b. Disperse 1 part of the three-arm intermediate into DMF by weight, heat up to 75 °C under a nitrogen atmosphere, and after stirring and dispersing, add 0.51 part of epichlorohydrin thereto. After stirring and mixing evenly, heat up to 102 °C, and slowly dropwise add a sodium hydroxide solution containing a total of 0.05 part of sodium hydroxide thereto, with the dropping time being 0.75 h. After the dropping is completed, continue to stir and react for 4 h. After vacuum distillation to remove the excess solvent and unreacted epichlorohydrin, wash the obtained product 3 times with deionized water at a temperature of 0 - 4 °C, and then dry to a constant weight to obtain the fluorine-modified epoxy resin;

[0045] S2. Prepare a rock wool insulation layer;

[0046] Spray the modified epoxy resin adhesive on the surface of the rock wool fiber, with the spraying amount being 80 kg per ton of fiber. After the spraying is completed, collect the rock wool fiber, stack it and then hot-press and cure it. The hot-pressing pressure is 0.04 MPa, the hot-pressing temperature is 180 °C, and the hot-pressing time is 2 h. After the hot-pressing is completed, a rock wool insulation layer is obtained;

[0047] S3. Prepare a high-strength rock wool core material;

[0048] S31. Mix 2 parts of cement, 3 parts of river sand, 0.005 part of cellulose, 1 part of latex and 0.5 part of water by weight. After mixing evenly to form a fluid slurry, add 0.5 part of hydrogen peroxide thereto, and stir at high speed for 30 s to obtain a cement slurry;

[0049] S32. Coat one side surface of the rock wool insulation layer prepared in step S2 with a layer of cement slurry, lay a layer of fiberglass mesh cloth on the surface of the cement slurry, coat another layer of cement slurry, shake it evenly, then place it in a curing room, set the curing temperature to 25 °C, the curing humidity to 75%, cure for 3 days, dry to a constant weight, cut the side of the rock wool insulation layer without the cement mortar protective layer, stop cutting when the cutting depth reaches the cement mortar protective layer, and after blowing and sweeping the cutting chips, the high-strength rock wool core material is obtained.

[0050] Example 2. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0051] Compared with Example 1, the addition amount of the fluorine-modified epoxy resin adhesive in step S1 is increased in this example;

[0052] S1. Prepare a modified epoxy resin adhesive;

[0053] By weight parts, 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 part of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water are mixed. After dropping ammonia water to adjust the pH value of the solution to 7.5, high-speed stirring is carried out for emulsification. During the emulsification process, the temperature of the mixed system is controlled at 55-70 °C. After the emulsification is completed, a modified epoxy resin adhesive solution is obtained;

[0054] Among them, the preparation method of the fluorine-modified epoxy resin includes the following steps:

[0055] a. By weight parts, 1 part of glyceric acid is dispersed in DMF. After mixing evenly, 0.05 part of benzenesulfonic acid is added, and after continuing to mix for 30 min, it is left standing for standby to obtain a glyceric acid dispersion;

[0056] 4.5 parts of 4,4'-(hexafluoroisopropylidene)bisphenol are dispersed in pure DMF. After mixing evenly, the glyceric acid dispersion is added dropwise thereto at a uniform speed. The dropping time is 3 h. During the dropping process, the temperature of the reaction system is maintained at 120 °C. After the dropping is completed, stirring reaction is continued for 3 h, then heating is stopped. After rotary evaporation to remove the excess solvent, a three-armed intermediate is obtained;

[0057] b. By weight parts, 1 part of the three-armed intermediate is dispersed in DMF. Under a nitrogen atmosphere, the temperature is raised to 75 °C. After stirring and dispersing, 0.51 part of epichlorohydrin is added thereto. After stirring and mixing evenly, the temperature is raised to 102 °C. A sodium hydroxide solution containing a total of 0.05 part of sodium hydroxide is slowly added dropwise thereto. The dropping time is 0.75 h. After the dropping is completed, stirring reaction is continued for 4 h. After vacuum distillation to remove the excess solvent and unreacted epichlorohydrin, the obtained product is washed 3 times with deionized water at a temperature of 0-4 °C and then dried to a constant weight to obtain the fluorine-modified epoxy resin.

[0058] Example 3. A preparation method of a high-strength rock wool core material includes the following steps:

[0059] Compared with Example 2, the addition amount of 4,4'-(hexafluoroisopropylidene)bisphenol in step a is increased in this example;

[0060] S1. Prepare a modified epoxy resin adhesive solution;

[0061] By weight parts, 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 part of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water are mixed. After dropping ammonia water to adjust the pH value of the solution to 7.5, high-speed stirring is carried out for emulsification. During the emulsification process, the temperature of the mixed system is controlled at 55-70 °C. After the emulsification is completed, a modified epoxy resin adhesive solution is obtained;

[0062] Among them, the preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0063] a. By weight, disperse 1 part of tricarboxylic acid into DMF, after mixing evenly, add 0.05 part of benzenesulfonic acid, continue to mix for 30 min, then stand by to obtain a tricarboxylic acid dispersion;

[0064] Disperse 5.9 parts of 4,4'-(hexafluoroisopropylidene)bisphenol into pure DMF, after mixing evenly, dropwise add the tricarboxylic acid dispersion thereto at a constant speed, the dropping time is 3 h, during the dropping process, maintain the temperature of the reaction system at 120 °C, after the dropping is completed, continue to stir and react for 3 h, then stop heating, remove the excess solvent by rotary evaporation to obtain a three-arm intermediate;

[0065] b. By weight, disperse 1 part of the three-arm intermediate into DMF, heat up to 75 °C under a nitrogen atmosphere, after stirring and dispersing, add 0.51 part of epichlorohydrin thereto, after stirring and mixing evenly, heat up to 102 °C, slowly dropwise add a sodium hydroxide solution containing a total of 0.05 part of sodium hydroxide thereto, the dropping time is 0.75 h, after the dropping is completed, continue to stir and react for 4 h, then remove the excess solvent and unreacted epichlorohydrin by vacuum distillation, wash the obtained product 3 times with deionized water at a temperature of 0 - 4 °C, and dry to constant weight to obtain the fluorine-modified epoxy resin.

[0066] Example 4. A preparation method of a high-strength rock wool core material comprises the following steps:

[0067] Compared with Example 3, the addition amount of epichlorohydrin in step b is increased in this example;

[0068] S1. Prepare a modified epoxy resin adhesive;

[0069] By weight, mix 10 parts of epoxy resin, 3 parts of fluorine-modified epoxy resin, 0.9 part of acetone diluent, 3.1 parts of EN71-9 aromatic amine curing agent and 9 parts of deionized water, dropwise add ammonia water to adjust the pH value of the solution to 7.5, then stir and emulsify at a high speed, control the temperature of the mixed system at 55 - 70 °C during the emulsification process, and obtain a modified epoxy resin adhesive after the emulsification is completed;

[0070] Among them, the preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0071] a. By weight, disperse 1 part of tricarboxylic acid into DMF, after mixing evenly, add 0.05 part of benzenesulfonic acid, continue to mix for 30 min, then stand by to obtain a tricarboxylic acid dispersion;

[0072] Disperse 5.9 parts of 4,4'-(hexafluoroisopropylidene)bisphenol into pure DMF, and after mixing evenly, slowly add a dispersion of tricarboxylic acid thereto at a constant rate over 3 h while maintaining the temperature of the reaction system at 120 °C during the addition. After the addition is completed, continue stirring and reacting for 3 h, then stop heating. After rotary evaporation to remove the excess solvent, a three-arm intermediate is obtained;

[0073] b. Disperse 1 part of the three-arm intermediate into DMF by weight, heat up to 75 °C under a nitrogen atmosphere, and after stirring and dispersing, add 0.84 parts of epichlorohydrin thereto. After stirring and mixing evenly, heat up to 102 °C, and slowly add a sodium hydroxide solution containing a total of 0.05 parts of sodium hydroxide thereto over 0.75 h. After the addition is completed, continue stirring and reacting for 4 h, then remove the excess solvent and unreacted epichlorohydrin by vacuum distillation. After the obtained product is washed 3 times with deionized water at a temperature of 0 - 4 °C, it is dried to a constant weight to obtain a fluorine-modified epoxy resin;

[0074] S2. Prepare a rock wool insulation layer;

[0075] Spray the modified epoxy resin sizing agent onto the surface of the rock wool fibers at a spraying amount of 80 kg per ton of fibers. After the spraying is completed, collect the rock wool fibers, stack them and then hot-press and cure them. The hot-pressing pressure is 0.04 MPa, the hot-pressing temperature is 180 °C, and the hot-pressing time is 2 h. After the hot-pressing is completed, a rock wool insulation layer is obtained.

[0076] Example 5. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0077] Compared with Example 4, in this example, the addition amount of the modified epoxy resin sizing agent in step S2 is increased;

[0078] S1. Prepare a modified epoxy resin sizing agent;

[0079] 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, and then stir and emulsify at high speed. During the emulsification process, control the temperature of the mixed system at 55 - 70 °C. After the emulsification is completed, a modified epoxy resin sizing agent is obtained;

[0080] Among them, the preparation method of the fluorine-modified epoxy resin comprises the following steps:

[0081] a. Disperse 1 part of tricarboxylic acid into DMF by weight, and after mixing evenly, add 0.05 parts of benzenesulfonic acid, continue to mix for 30 min, and then stand by to obtain a tricarboxylic acid dispersion;

[0082] 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.

[0083] 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;

[0084] S2. Preparation of rock wool insulation layer;

[0085] 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.

[0086] Comparative Example 1. A method for preparing a high-strength rock wool core material, comprising the following steps:

[0087] Compared with Example 1, this example does not add fluorine-modified epoxy resin to prepare;

[0088] S1. Preparing modified epoxy resin glue;

[0089] 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;

[0090] S2. Preparation of rock wool insulation layer;

[0091] 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;

[0092] S3. Preparation of high-strength rock wool core material;

[0093] S31. Mix 2 parts of cement, 3 parts of river sand, 0.005 part of cellulose, 1 part of latex and 0.5 part of water by weight. After mixing evenly to form a fluid slurry, add 0.5 part of hydrogen peroxide thereto, and stir at high speed for 30 s to obtain a cement slurry.

[0094] S32. Coat one side surface of the rock wool insulation layer prepared in step S2 with a layer of cement slurry, lay a layer of fiberglass mesh cloth on the surface of the cement slurry, coat another layer of cement slurry, shake evenly, then place it in a curing room, set the curing temperature at 25 °C and the curing humidity at 75%, cure for 3 days, dry to constant weight, cut the side of the rock wool insulation layer without the cement mortar protective layer, stop cutting when reaching the cement mortar protective layer, and blow off the cutting chips to obtain the high-strength rock wool core material.

[0095] Detection:

[0096] Prepare the rock wool insulation layers prepared in step S2 of Examples 1-5 and Comparative Example 1 into test specimens, and test the volume water absorption of the rock wool core material according to GB / T5480-2017; detect its tensile strength according to GB / T30804-2014.

[0097] Prepare the rock wool insulation layers prepared in step S2 of Examples 1-5 and Comparative Example 1 into test specimens, do not coat the cement slurry on their surfaces, place them at a temperature of 25 °C and a relative humidity of 100%, and after placing for 7 days, detect their tensile strength again.

[0098]

[0099] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A high-strength rock wool core material, characterized in that: The rock wool high-strength core material consists of a rock wool insulation layer and a cement mortar protective layer coated on one side of the rock wool insulation layer; Among them, the cement mortar protective layer also contains fiberglass mesh cloth; The rock wool insulation layer is formed by mixing rock wool fibers and a modified epoxy resin adhesive solution and curing them under high temperature and high pressure; Among them, the addition amount of the modified epoxy resin adhesive solution is 75-120 kg / ton of fibers; By weight, the modified epoxy resin adhesive solution consists 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; The preparation method of the fluorine-modified epoxy resin includes the following steps: a. Disperse tricarboxylic acid in DMF, mix evenly, add benzenesulfonic acid, continue to mix for 15-30 min, and then stand by to obtain a tricarboxylic acid dispersion; Disperse 4,4'-(hexafluoroisopropylidene)bisphenol in pure DMF, mix evenly, and then uniformly dropwise add the tricarboxylic acid dispersion to it. The dropping time is 2-4 h, and the temperature of the reaction system is maintained at 100-150 °C during the dropping process. After the dropping is completed, continue to stir and react for 1-3 h, then stop heating, and rotary evaporate to remove the excess solvent to obtain a three-arm intermediate; b. Disperse the three-arm intermediate in DMF, heat up to 75 °C under a nitrogen atmosphere, stir and disperse, then add epichlorohydrin to it, stir and mix evenly, heat up to 98-105 °C, and slowly dropwise add a sodium hydroxide solution. The dropping time is 0.5-0.75 h. After the dropping is completed, continue to stir and react for 3-5 h, then distill under reduced pressure to remove the excess solvent and unreacted epichlorohydrin, and wash the obtained product 2-3 times with deionized water at a temperature of 0-4 °C, and then dry to constant weight to obtain the fluorine-modified epoxy resin.

2. The rock wool high-strength core material according to claim 1, characterized in that: In the modified epoxy resin adhesive solution, the epoxy resin is any one of E51 and E44 type epoxy resins; The diluent is any one or more of acetone, ethyl acetate, and absolute ethanol; The curing agent is EN71-9 aromatic amine.

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

4. A high-strength rock wool core material according to claim 1, 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.

5. A preparation method of the rock wool high-strength core material as described in any one of claims 1-4, characterized in that, It includes the following steps: S1. Prepare the modified epoxy resin adhesive solution; Mix the epoxy resin, fluorine-modified epoxy resin, diluent, curing agent, and deionized water, dropwise add ammonia water to adjust the pH value of the solution to 7.2-7.5, and then stir at high speed for emulsification. Control the temperature of the mixed system at 30-70 °C during the emulsification process. After the emulsification is completed, obtain the modified epoxy resin adhesive solution; S2. Prepare the rock wool insulation layer; Spray the modified epoxy resin adhesive solution on the surface of the rock wool fibers. After the spraying is completed, collect the rock wool fibers, stack them, and hot press and cure them to obtain the rock wool insulation layer; S3. Prepare the rock wool high-strength core material; S31. Mix cement, river sand, cellulose, latex and water. After mixing evenly to form a fluid slurry, add hydrogen peroxide thereto. After high-speed stirring for 15 - 30 s, obtain a cement slurry. S32. Coat one side surface of the rock wool insulation layer prepared in step S2 with a layer of cement slurry. Lay a layer of fiberglass mesh cloth on the surface of the cement slurry. Coat another layer of cement slurry again. After shaking evenly, place it in a curing room. After curing for 3 days, take it out. After drying to a constant weight, cut the side of the rock wool insulation layer without the cement mortar protective layer. Stop cutting when the cutting depth reaches the cement mortar protective layer. After purging the cutting chips, obtain the high-strength rock wool core material.

6. The preparation method of a high-strength rock wool core material according to claim 5, characterized in that: In step S2, during hot pressing and curing, the pressure is 0.03 - 0.05 MPa, the temperature is 170 - 185 °C, and the hot pressing duration is 1 - 2 h.

7. The preparation method of a high-strength rock wool core material according to claim 5, characterized in that: 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 part of cellulose, 0.8 - 1.1 parts of latex and 0.5 - 0.8 parts of water.

8. The preparation method of a high-strength rock wool core material according to claim 5, characterized in that: In step S3, the curing temperature in the curing room is 20 - 25 °C, and the relative humidity is 75 - 100%.

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