Waterproof thermal insulation core material and preparation method thereof

Abstract

The invention relates to the technical field of building thermal insulation materials, in particular to a waterproof thermal insulation core material and a preparation method thereof.According to the waterproof thermal insulation core material and the preparation method thereof, phenolic resin is modified through lignin-based polyurethane prepolymer, a foaming technology of Tween-80 and n-pentane is combined, a foam structure high in percentage of closed area and uniform in pore diameter is formed, heat conduction is effectively reduced, and the thermal insulation performance is improved; the thermal insulation performance of the core material is improved; a flexible chain segment of the lignin-based polyurethane prepolymer can improve the brittleness of the phenolic foam, so that the compressive strength is improved, and the load of the external facade of a building can be tolerated; and secondly, the rock wool has excellent heat insulation performance, after cleaning and punching treatment, the porosity is effectively improved, and the foaming agent can permeate conveniently, so that the overall heat conductivity coefficient of the material can be further reduced, the air permeability and the drainage performance are enhanced, and heat insulation performance attenuation caused by water retention is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of building thermal insulation materials, and in particular to a waterproof thermal insulation core material and a preparation method thereof. Background Art

[0002] Although traditional building insulation materials have certain thermal insulation properties, their porous structure easily absorbs water and moisture, resulting in a significant increase in thermal conductivity. In long-term use, they are prone to powderization and failure due to freeze-thaw cycles or microbial growth. In the prior art, moisture resistance is often improved by coating the surface with waterproof coatings, but the coating has poor interfacial bonding with the substrate and is easily peeled off after being impacted by external forces. Moreover, high-thickness coatings will sacrifice the lightweight advantages of the material. In addition, in traditional processes, the hydrophobic agent has poor compatibility with the insulation substrate and is easy to migrate to the surface to form a weak interface layer, which in turn increases the risk of cracking.

[0003] In recent years, composite waterproof and thermal insulation materials have achieved functional synergy through component compounding, but there are still problems such as complex processes and high costs. Therefore, how to prepare a thermal insulation core material with excellent thermal insulation and waterproof properties and low cost has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a waterproof thermal insulation core material and a preparation method thereof, which can effectively solve the problem of poor thermal insulation and waterproof performance of the thermal insulation core material in the prior art.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A waterproof and heat-insulating core material, the composition of the waterproof and heat-insulating core material comprises the following components: modified phenolic foam, rock wool and a waterproofing agent component;

[0009] The modified phenolic foam is prepared by modifying phenolic resin with a lignin-based polyurethane prepolymer and then foaming it;

[0010] The waterproofing agent component is prepared with organic silicon waterproofing agent, silane coupling agent KH-560 and defoaming agent as main raw materials.

[0011] Furthermore, the preparation method of the lignin-based polyurethane prepolymer is:

[0012] Weigh 55 - 60 g of polyether polyol and 18 - 20 g of lignin and pour them into a flask. Heat to 110 - 140 °C and dehydrate for 2 h under a vacuum of 0.095 MPa. Then cool to 70 °C under nitrogen protection. After removing the vacuum and nitrogen devices, add 15 - 16 g of 2,4 - toluene diisocyanate and 0.4 - 0.5 g of dibutyltin dilaurate, and react at 80 °C for 4 h. What is obtained is the lignin - based polyurethane prepolymer.

[0013] Furthermore, the preparation steps of the modified phenolic foam are as follows:

[0014] Step 1: Mix the lignin - based polyurethane prepolymer and acetone according to a weight ratio of 3:1, and carry out a stirring reaction in a closed container at 70 °C. Then raise the temperature to 80 °C and carry out rapid stirring. What is obtained is denoted as the polyurethane - modified component.

[0015] Step 2: Weigh 5 - 8 g of the polyurethane - modified component and add it to 100 g of phenolic resin. Stir evenly at room temperature quickly, then add 4 - 5 g of Tween - 80 and 10 - 12 g of n - pentane. After stirring evenly at high speed, add 5 - 7 g of p - toluenesulfonic acid. Stir again until the foam turns white, and what is obtained is the modified phenolic foam.

[0016] Furthermore, in Step 1, the method of the stirring reaction is to stir at a stirring speed of 300 r / min for 10 min. The method of the rapid stirring in Step 1 is to stir at a stirring speed of 800 r / min for 15 min. The method of the quick stirring evenly in Step 2 is to stir at a stirring speed of 500 r / min for 10 min. The method of the high - speed stirring evenly in Step 2 is to stir at a stirring speed of 800 r / min for 10 min. The stirring speed of the re - stirring in Step 2 is 300 r / min.

[0017] Furthermore, the preparation method of the organosilicon waterproofing agent is as follows:

[0018] S1: Weigh 50 mL of deionized water, 30 mL of methanol, and 10 mL of hydrochloric acid solution and mix them. After stirring and mixing evenly, what is obtained is denoted as the mixed component.

[0019] S2: Weigh 50 g of propyltrimethoxysilane and 50 mL of methanol and pour them into a flask. Stir and raise the temperature to 40 - 50 °C, then dropwise add 25 mL of the mixed component. After dropping, raise the temperature to 65 °C and distill to collect methanol. Raise the temperature to 120 °C and condense for 3 h. What is obtained is the organosilicon waterproofing agent.

[0020] Furthermore, the mass fraction of the hydrochloric acid solution in S1 is 10%. The method of stirring and mixing evenly in S1 is to stir at a stirring speed of 500 r / min for 10 min. The stirring speed of stirring and raising the temperature in S2 is 300 r / min. The dropping rate in S2 is 1 - 2 mL / min.

[0021] Furthermore, the preparation method of the waterproofing agent component is as follows:

[0022] After adding 15 - 20 parts by weight of silicone waterproofing agent, 8 - 10 parts by weight of silane coupling agent KH - 560, and 2 - 3 parts by weight of defoaming agent to 100 parts by weight of methanol, stir at a stirring speed of 300 r / min for 10 min, and the obtained product is the waterproofing agent component.

[0023] Furthermore, the defoaming agent is polydimethylsiloxane.

[0024] A preparation method of a waterproof and heat - insulating core material, and the preparation method is as follows:

[0025] Spray the modified phenolic foam evenly onto the surface of the rock wool after cleaning and punching, let it stand for 5 - 10 min, then place it in an oven at 70 - 75 °C for curing for 2 h. Then spray the waterproofing agent component on its surface, and let it air - dry at room temperature for 2 - 3 h. The obtained product is the waterproof and heat - insulating core material.

[0026] Furthermore, the method of the cleaning and punching treatment is as follows:

[0027] Immerse the rock wool in deionized water for 10 min, squeeze out the water, then place it in an oven at 60 - 70 °C for drying for 2 - 3 h. Then use a needle roller to punch holes evenly on its surface, the pore diameter is 0.5 - 1 mm, and the hole pitch is 10 - 15 mm.

[0028] Beneficial effects

[0029] The present invention provides a waterproof and heat - insulating core material and its preparation method. Compared with the existing well - known technologies, the present invention has the following beneficial effects:

[0030] 1. Through the modification of phenolic resin by lignin - based polyurethane prepolymer, combined with the Tween - 80 and n - pentane foaming processes, the present invention forms a foam structure with a high closed - cell rate and uniform pore size, effectively reducing heat conduction, thereby enhancing the heat - insulating performance of the core material; the flexible chain segments of the lignin - based polyurethane prepolymer can improve the brittleness of phenolic foam, thereby enhancing the compressive strength and making it tolerable to the loads on the building facade. Secondly, the rock wool in the present invention itself has excellent heat insulation. After the cleaning and punching treatment, the porosity is effectively increased, which is convenient for the penetration of the foaming agent, thereby further reducing the overall thermal conductivity of the material, enhancing the air permeability and drainage, and avoiding the attenuation of the heat - insulating performance caused by water retention.

[0031] 2. The waterproof agent prepared by the condensation reaction of propyltrimethoxysilane in the present invention can form a nanoscale hydrophobic film layer on the surface of rock wool, thereby effectively blocking the penetration of liquid water. The addition of silane coupling agent KH-560 can enhance the interfacial adhesion and prevent the waterproof layer from peeling off. Secondly, the modified phenolic foam itself has hydrophobic groups, forming a double waterproof barrier with the components of the waterproof agent, which can further improve the waterproof performance of the core material. Through the design of nano / micron-scale materials, interfacial chemical modification and process optimization, the present invention can achieve the synergistic improvement of thermal insulation, waterproof and mechanical properties, making the prepared core material have better application prospects. Detailed implementation manners

[0032] To make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] The present invention will be further described below in conjunction with embodiments.

[0034] The sources of some components in the examples and comparative examples are as follows:

[0035] Polyether polyol, polyether polyol 220 (PPG) (Mn = 2000, bifunctional), Tianjin Petrochemical No. 3 Plant;

[0036] Lignin, industrial grade, Songyuan Hehe Chemical Co., Ltd.;

[0037] 2,4-Toluene diisocyanate, industrial grade, Shandong Aite Chemical Co., Ltd.;

[0038] Dibutyltin dilaurate, chemically pure, Sinopharm Chemical Reagent Co., Ltd.;

[0039] Acetone, analytically pure, Tianjin Damao Reagent Factory;

[0040] Phenolic resin, industrial grade, Shandong Jinan Shengquan Group Co., Ltd.;

[0041] Tween-80, analytically pure, Tianjin Ketong Chemical Reagent Co., Ltd.;

[0042] n-Pentane, analytically pure, Tianjin Damao Reagent Factory;

[0043] p-Toluenesulfonic acid, industrial grade, Nanjing Milan Chemical Co., Ltd.;

[0044] Propyltrimethoxysilane, industrial grade, Jiangxi Chenguang New Materials Co., Ltd.;

[0045] Methanol, industrial grade, Jiangxi Chenguang New Materials Co., Ltd.;

[0046] Hydrochloric acid solution, industrial grade, Jiangxi Chenguang New Materials Co., Ltd.;

[0047] Silane coupling agent KH-560, Qufu Yishun Chemical Co., Ltd.;

[0048] Polydimethylsiloxane, Shandong Jueneng Chemical Co., Ltd.;

[0049] Example 1

[0050] A waterproof and heat-insulating core material in this example, the composition of the waterproof and heat-insulating core material includes the following components: modified phenolic foam, rock wool and waterproofing agent component;

[0051] The modified phenolic foam is prepared by foaming after modifying phenolic resin with lignin-based polyurethane prepolymer;

[0052] The preparation method of the lignin-based polyurethane prepolymer is as follows:

[0053] Weigh 55 g of polyether polyol and 18 g of lignin and pour them into a flask. Heat to 110 °C and dehydrate for 2 h under a vacuum of 0.095 MPa. Then cool to 70 °C under nitrogen protection. After removing the vacuum and nitrogen devices, add 15 g of 2,4-toluene diisocyanate and 0.4 g of dibutyltin dilaurate, and react at 80 °C for 4 h. What is obtained is the lignin-based polyurethane prepolymer.

[0054] The preparation steps of the modified phenolic foam are as follows:

[0055] Step 1: Mix the lignin-based polyurethane prepolymer and acetone according to a weight ratio of 3:1, stir in a closed container at a temperature of 70 °C at a stirring speed of 300 r / min for 10 min, then raise the temperature to 80 °C and stir at a stirring speed of 800 r / min for 15 min. What is obtained is recorded as the polyurethane modified component;

[0056] Step 2: Weigh 5 g of the polyurethane modified component and add it to 100 g of phenolic resin. Stir at a stirring speed of 500 r / min at room temperature for 10 min, then add 4 g of Tween-80 and 10 g of n-pentane, stir at a stirring speed of 800 r / min for 10 min, then add 5 g of p-toluenesulfonic acid, and stir again at a stirring speed of 300 r / min until the foam turns white. What is obtained is the modified phenolic foam.

[0057] The waterproofing agent component is prepared from organosilicon waterproofing agent, silane coupling agent KH-560 and defoaming agent as the main raw materials.

[0058] The preparation method of the organosilicon waterproofing agent is as follows:

[0059] S1. Weigh 50 mL of deionized water, 30 mL of methanol, and 10 mL of a 10% hydrochloric acid solution, mix them, and stir at a speed of 500 r / min for 10 min. The resulting mixture is denoted as the mixed component.

[0060] S2. Weigh 50 g of propyltrimethoxysilane and 50 mL of methanol and pour them into a flask. Stir and heat to 40 °C at a speed of 300 r / min. Then, dropwise add 25 mL of the mixed component at a dropping rate of 1 mL / min. After dropping, heat to 65 °C and distill to collect methanol. Heat to 120 °C and condense for 3 h. The resulting product is the organosilicon waterproofing agent.

[0061] The preparation method of the waterproofing agent component is as follows:

[0062] Add 15 parts by weight of the organosilicon waterproofing agent, 8 parts by weight of the silane coupling agent KH-560, and 2 parts by weight of the defoaming agent to 100 parts by weight of methanol, and stir at a speed of 300 r / min for 10 min. The resulting product is the waterproofing agent component.

[0063] The defoaming agent is polydimethylsiloxane.

[0064] A preparation method of a waterproof and heat-insulating core material. The preparation method is as follows:

[0065] Spray the modified phenolic foam evenly onto the surface of the rock wool that has been cleaned and punched, let it stand for 5 min, then place it in an oven at 70 °C for curing for 2 h. Then, spray the waterproofing agent component on its surface and let it air-dry at room temperature for 2 h. The resulting product is the waterproof and heat-insulating core material.

[0066] The method of cleaning and punching is as follows:

[0067] Immerse the rock wool in deionized water for 10 min, squeeze out the water, place it in an oven at 60 °C for drying for 2 h, and then evenly punch holes on its surface with a needle roller. The pore diameter is 0.5 mm and the hole pitch is 10 mm.

[0068] Example 2

[0069] A waterproof and heat-insulating core material in this example. The composition of the waterproof and heat-insulating core material includes the following components: modified phenolic foam, rock wool, and waterproofing agent component;

[0070] The modified phenolic foam is prepared by foaming after modifying phenolic resin with lignin-based polyurethane prepolymer;

[0071] The preparation method of the lignin-based polyurethane prepolymer is as follows:

[0072] Weigh 60 g of polyether polyol and 20 g of lignin and pour them into a flask. Heat to 140 °C and dehydrate for 2 h under a vacuum of 0.095 MPa. Then cool to 70 °C under nitrogen protection. After removing the vacuum and nitrogen devices, add 16 g of 2,4-toluene diisocyanate and 0.5 g of dibutyltin dilaurate, and react at 80 °C for 4 h. What is obtained is the lignin-based polyurethane prepolymer.

[0073] The preparation steps of the modified phenolic foam are as follows:

[0074] Step 1: Mix the lignin-based polyurethane prepolymer and acetone according to a weight ratio of 3:1. Stir in a closed container at 70 °C with a stirring speed of 300 r / min for 10 min. Then raise the temperature to 80 °C and stir at a stirring speed of 800 r / min for 15 min. What is obtained is denoted as the polyurethane modified component.

[0075] Step 2: Weigh 8 g of the polyurethane modified component and add it to 100 g of phenolic resin. Stir at a stirring speed of 500 r / min at room temperature for 10 min, then add 5 g of Tween-80 and 12 g of n-pentane. Stir at a stirring speed of 800 r / min for 10 min, then add 7 g of p-toluenesulfonic acid. Stir again at a stirring speed of 300 r / min until the foam turns white. What is obtained is the modified phenolic foam.

[0076] The waterproofing agent component is prepared from an organosilicon waterproofing agent, a silane coupling agent KH-560, and an antifoaming agent as the main raw materials.

[0077] The preparation method of the organosilicon waterproofing agent is as follows:

[0078] S1: Weigh 50 mL of deionized water, 30 mL of methanol, and 10 mL of a 10% hydrochloric acid solution and mix them. Stir at a stirring speed of 500 r / min for 10 min. What is obtained is denoted as the mixed component.

[0079] S2: Weigh 50 g of propyltrimethoxysilane and 50 mL of methanol and pour them into a flask. Stir and heat to 50 °C at a stirring speed of 300 r / min. Then, dropwise add 25 mL of the mixed component at a dropping rate of 2 mL / min. After dropping, raise the temperature to 65 °C and distill to collect methanol. Raise the temperature to 120 °C and condense for 3 h. What is obtained is the organosilicon waterproofing agent.

[0080] The preparation method of the waterproofing agent component is as follows:

[0081] Add 20 parts by weight of the organosilicon waterproofing agent, 10 parts by weight of the silane coupling agent KH-560, and 3 parts by weight of the antifoaming agent to 100 parts by weight of methanol, and then stir at a stirring speed of 300 r / min for 10 min. What is obtained is the waterproofing agent component.

[0082] The antifoaming agent is polydimethylsiloxane.

[0083] A preparation method of a waterproof and heat-insulating core material, and the preparation method is as follows:

[0084] Spray the modified phenolic foam evenly onto the surface of the rock wool after cleaning and punching, let it stand for 10 min and then cure it in an oven at 75 °C for 2 h. Then spray the waterproofing agent component on its surface, and let it air-dry at room temperature for 3 h. What is obtained is the waterproof and heat-insulating core material.

[0085] The method of cleaning and punching is as follows:

[0086] Immerse the rock wool in deionized water for 10 min, squeeze out the water and then dry it in an oven at 70 °C for 3 h. Then use a needle roller to punch holes evenly on its surface, with a hole diameter of 1 mm and a hole pitch of 15 mm.

[0087] Example 3

[0088] A waterproof and heat-insulating core material in this example, and the composition of the waterproof and heat-insulating core material includes the following components: modified phenolic foam, rock wool and waterproofing agent component;

[0089] The modified phenolic foam is obtained by foaming after modifying phenolic resin with lignin-based polyurethane prepolymer;

[0090] The preparation method of the lignin-based polyurethane prepolymer is as follows:

[0091] Weigh 58 g of polyether polyol and 19 g of lignin and pour them into a flask. Heat to 130 °C and dehydrate for 2 h under a vacuum of 0.095 MPa. Then cool to 70 °C under nitrogen protection. Remove the vacuum and nitrogen devices and add 16 g of 2,4-toluene diisocyanate and 0.5 g of dibutyltin dilaurate. React at 80 °C for 4 h. What is obtained is the lignin-based polyurethane prepolymer.

[0092] The preparation steps of the modified phenolic foam are as follows:

[0093] Step 1: Mix the lignin-based polyurethane prepolymer and acetone according to a weight ratio of 3:1, stir in a closed container at a temperature of 70 °C at a stirring speed of 300 r / min for 10 min, then raise the temperature to 80 °C and stir at a stirring speed of 800 r / min for 15 min. What is obtained is denoted as the polyurethane-modified component;

[0094] Step 2: Weigh 7 g of the polyurethane-modified component and add it to 100 g of phenolic resin. Stir at a stirring speed of 500 r / min at room temperature for 10 min, then add 5 g of Tween-80 and 11 g of n-pentane. Stir at a stirring speed of 800 r / min for 10 min, then add 6 g of p-toluenesulfonic acid, and stir again at a stirring speed of 300 r / min until the foam turns white. What is obtained is the modified phenolic foam.

[0095] The waterproofing agent component is prepared from organosilicon waterproofing agent, silane coupling agent KH-560 and defoaming agent as the main raw materials.

[0096] The preparation method of the organosilicon waterproofing agent is as follows:

[0097] S1. Weigh 50 mL of deionized water, 30 mL of methanol and 10 mL of hydrochloric acid solution with a mass fraction of 10%, mix them, and record the mixture obtained after stirring at a stirring speed of 500 r / min for 10 min as the mixed component;

[0098] S2. Weigh 50 g of propyltrimethoxysilane and 50 mL of methanol and pour them into a flask, stir and heat to 45°C at a stirring speed of 300 r / min, then dropwise add 25 mL of the mixed component at a dropping rate of 2 mL / min. After dropping, heat to 65°C and distill to collect methanol, and then heat to 120°C for condensation for 3 h. The product obtained is the organosilicon waterproofing agent.

[0099] The preparation method of the waterproofing agent component is as follows:

[0100] After adding 18 parts by weight of the organosilicon waterproofing agent, 9 parts by weight of the silane coupling agent KH-560 and 3 parts by weight of the defoaming agent to 100 parts by weight of methanol, stir at a stirring speed of 300 r / min for 10 min. The product obtained is the waterproofing agent component.

[0101] The defoaming agent is polydimethylsiloxane.

[0102] A preparation method of a waterproof and heat-insulating core material, the preparation method is as follows:

[0103] Spray the modified phenolic foam evenly on the surface of the rock wool after cleaning and drilling, let it stand for 8 min, then place it in an oven at 73°C for curing for 2 h, and then spray the waterproofing agent component on its surface. After air-drying at room temperature for 3 h, the obtained product is the waterproof and heat-insulating core material.

[0104] The method of cleaning and drilling is as follows:

[0105] Immerse the rock wool in deionized water for 10 min, squeeze out the water, then place it in an oven at 65°C for drying for 3 h, and then use a needle roller to punch holes evenly on its surface, with a hole diameter of 0.8 mm and a hole pitch of 12 mm.

[0106] Comparative Example 1

[0107] A waterproof and heat-insulating core material and its preparation method provided in this comparative example are generally the same as those in Example 1. The main difference is that in this Comparative Example 1, the lignin-based polyurethane prepolymer in Example 1 is replaced with a polyurethane prepolymer with the model number 103837-45-2 produced by Xinyuhong.

[0108] Comparative Example 2

[0109] A waterproof and heat-insulating core material provided in this comparative example and its preparation method are generally the same as those in Example 1, and the main difference is that in this Comparative Example 2, the silicone waterproofing agent in Example 1 is replaced with a waterproofing agent with the model of Shengbang silicone SI-FS101 waterproofing agent.

[0110] Performance test

[0111] The waterproof and heat-insulating core materials prepared in Examples 1-3 and Comparative Examples 1-2 are respectively marked as Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2, and then the performances of Examples 1-3 and Comparative Examples 1-2 are detected. The specific detection methods and detection items are as follows:

[0112] 1. Refer to the standard of GB / T9341-2008 to detect the flexural strength of Examples 1-3 and Comparative Examples 1-2, and record the obtained data in the following table;

[0113] 2. Refer to the standard of GB / T10294-2008 to detect the thermal conductivity of Examples 1-3 and Comparative Examples 1-2, and record the obtained data in the following table;

[0114] 3. Detect the water contact angle of Examples 1-3 and Comparative Examples 1-2, and record the obtained data in the following table;

[0115]

[0116] It can be seen from the data in the above table that the heat-insulating performance and mechanical strength of the waterproof and heat-insulating core materials in Examples 1-3 of this example are significantly better than those in Comparative Example 1, indicating that adding lignin-based polyurethane prepolymer during the preparation process can play a role in improving the heat-insulating performance and mechanical strength of the core material. The water contact angle of the waterproof and heat-insulating core materials in Examples 1-3 of this example is significantly larger than that in Comparative Example 2, indicating that the silicone waterproofing agent in Examples 1-3 of this example can play a better waterproofing role.

[0117] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waterproof and heat-insulating core material, characterized in that, The composition of the waterproof and heat-insulating core material includes the following components: modified phenolic foam, rock wool, and a waterproofing agent component; The modified phenolic foam is obtained by foaming phenolic resin modified with a lignin-based polyurethane prepolymer; The waterproofing agent component is prepared using an organosilicon waterproofing agent, silane coupling agent KH-560, and an antifoaming agent as the main raw materials.

2. The waterproof and heat-insulating core material according to claim 1, wherein, The preparation method of the lignin-based polyurethane prepolymer is as follows: Weigh 55-60 g of polyether polyol and 18-20 g of lignin and pour them into a flask. Heat to 110-140 °C and dehydrate for 2 h under a vacuum of 0.095 MPa. Then, cool to 70 °C under nitrogen protection. After removing the vacuum and nitrogen devices, add 15-16 g of 2,4-toluene diisocyanate and 0.4-0.5 g of dibutyltin dilaurate, and react at 80 °C for 4 h. What is obtained is the lignin-based polyurethane prepolymer.

3. A waterproof and heat-insulating core material according to claim 1, characterized in that The preparation steps of the modified phenolic foam are as follows: Step 1: Mix the lignin-based polyurethane prepolymer and acetone in a weight ratio of 3:1, and carry out a stirring reaction in a closed container at 70 °C. Then, raise the temperature to 80 °C and carry out rapid stirring. What is obtained is denoted as the polyurethane-modified component; Step 2: Weigh 5-8 g of the polyurethane-modified component and add it to 100 g of phenolic resin. Stir evenly at room temperature quickly, then add 4-5 g of Tween-80 and 10-12 g of n-pentane. After stirring evenly at high speed, add 5-7 g of p-toluenesulfonic acid, and stir again until the foam turns white. What is obtained is the modified phenolic foam.

4. A waterproof and heat-insulating core material according to claim 3, wherein The method of stirring reaction in Step 1 is to stir at a stirring speed of 300 r / min for 10 min. The method of rapid stirring in Step 1 is to stir at a stirring speed of 800 r / min for 15 min. The method of quickly stirring evenly in Step 2 is to stir at a stirring speed of 500 r / min for 10 min. The method of stirring evenly at high speed in Step 2 is to stir at a stirring speed of 800 r / min for 10 min. The stirring speed of stirring again in Step 2 is 300 r / min.

5. A waterproof and heat-insulating core material according to claim 1, characterized in that, The preparation method of the organosilicon waterproofing agent is as follows: S1: Weigh 50 mL of deionized water, 30 mL of methanol, and 10 mL of hydrochloric acid solution and mix them. After stirring and mixing evenly, what is obtained is denoted as the mixed component; S2: Weigh 50 g of propyltrimethoxysilane and 50 mL of methanol and pour them into a flask. Stir and heat to 40-50 °C, then dropwise add 25 mL of the mixed component. After dropping, raise the temperature to 65 °C and distill to collect methanol. Raise the temperature to 120 °C and condense for 3 h. What is obtained is the organosilicon waterproofing agent.

6. A waterproof and heat-insulating core material according to claim 5, characterized in that, The mass fraction of the hydrochloric acid solution in S1 is 10%. The method of stirring and mixing evenly in S1 is to stir at a stirring speed of 500 r / min for 10 min. The stirring speed of stirring and heating in S2 is 300 r / min. The dropping rate in S2 is 1-2 mL / min.

7. A waterproof and heat-insulating core material according to claim 1, characterized in that, The preparation method of the waterproofing agent component is as follows: Add 15-20 parts by weight of the organosilicon waterproofing agent, 8-10 parts by weight of silane coupling agent KH-560, and 2-3 parts by weight of the antifoaming agent to 100 parts by weight of methanol, and stir at a stirring speed of 300 r / min for 10 min. What is obtained is the waterproofing agent component.

8. A waterproof and heat-insulating core material according to claim 1, characterized in that The defoamer is polydimethylsiloxane.

9. The preparation method of a waterproof and heat-insulating core material according to any one of claims 1-8, characterized in that, The preparation method is as follows: Spray the modified phenolic foam evenly onto the surface of the rock wool that has been cleaned and perforated, let it stand for 5 - 10 minutes, then place it in an oven at 70 - 75 °C for 2 hours of curing. Then spray the waterproofing agent component on its surface, and let it air-dry at room temperature for 2 - 3 hours. What is obtained is the waterproof and heat-insulating core material.

10. The preparation method of a waterproof and heat-insulating core material according to claim 9, characterized in that, The method of the cleaning and perforating treatment is as follows: Immerse the rock wool in deionized water for 10 minutes, squeeze out the water, then place it in an oven at 60 - 70 °C for 2 - 3 hours of drying. Then use a needle roller to evenly perforate its surface, with the pore diameter being 0.5 - 1 mm and the pore distance being 10 - 15 mm.

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