A polyurethane all-water composite material and its preparation method and application

Abstract

The present invention relates to the technical field of polyurethane foam, and in particular to a polyurethane all-water composite material and a preparation method and application thereof. The composite material includes a white material and a black material, and the mass ratio of the white material to the black material is 1: (0.8-1); the white material includes the following components: 70-85 parts of a polyol composition, 0.5-1.5 parts of a catalyst, 1-2 parts of a stabilizer, 6-10 parts of a filler, and 2-3 parts of water; the black material is polymethylene polyphenyl isocyanate; and the filler is modified diatomite. The filler is prepared by heating a modified flame retardant and pretreated diatomite. The siloxane group of the silane coupling agent undergoes a condensation reaction with a hydroxyl group on the surface of the diatomite to form a stable silicon-oxygen bond, thereby enhancing the bonding force between the diatomite and the flame retardant and improving the flame retardancy of the material; the density of the hydrophilic group on the surface of the diatomite is also reduced, thereby improving the compatibility of the modified diatomite in the polymer matrix, supporting the pores, and ultimately improving the hardness of the product.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane foam, and in particular to a polyurethane all-water composition material and a preparation method and application thereof. Background Art

[0002] Polyurethane rigid foam is a polymer formed by chemical reaction with polyol (polyether or polyester polyol) and isocyanate as main raw materials, under the action of surfactants, catalysts, foaming agents and other auxiliary agents. Water-blown polyurethane rigid foam uses water as foaming agent. The principle is that water reacts with isocyanate to generate CO 2 , CO 2 The ozone-destroying ODP value of the polyurethane rigid foam is 0, which is a non-toxic and environmentally friendly polyurethane rigid foam. It is widely used in cut sheets, tube shells, pipeline supports, thin sheets, etc. as refrigerated truck transportation, LNG pipe support transportation, cold storage insulation, and car roof sound-absorbing materials. Although all-water polyurethane rigid foam has significant advantages in environmental protection, it still faces some challenges in practical applications, especially in terms of flame retardancy and physical property stability.

[0003] In terms of physical properties, low-density polyurethane rigid foam made by all-water foaming has a large amount of water in the foaming system, which makes the foam brittle, and the strength, dimensional stability and thermal insulation properties deteriorate. In terms of flame retardancy, all-water polyurethane rigid foam also faces challenges. Due to the use of water as a foaming agent, the effect of traditional additive flame retardants in the all-water system is easily affected, such as easy migration, short-term flame retardant effect, and destruction of the physical properties of the foam (such as hardness and compression strength). Therefore, without damaging the inherent environmental protection and physical properties of all-water polyurethane rigid foam, improving its flame retardancy has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present invention is to provide a polyurethane all-water composition, which introduces modified diatomaceous earth as a key component. The modified diatomaceous earth can not only effectively improve the flame retardant properties of polyurethane, but also enhance the hardness and physical stability of the foam to a certain extent, thereby overcoming the shortcomings of all-water foamed polyurethane rigid foam in terms of flame retardancy and physical properties.

[0005] The second object of the present invention is to provide a method for preparing a polyurethane all-water composition material, which is simple and easy to put into actual production.

[0006] The third purpose of the present invention is to use a polyurethane all-water combination material, which has broad application prospects.

[0007] One of the purposes of the present invention is achieved by the following technical solution:

[0008] A polyurethane all-water composite material, comprising a white material and a black material, wherein the mass ratio of the white material to the black material is 1:(0.8-1);

[0009] The white material comprises the following components: 70-85 parts of a polyol composition, 0.5-1.5 parts of a catalyst, 1-2 parts of a stabilizer, 6-10 parts of a filler, and 2-3 parts of water;

[0010] The black material is polymethylene polyphenyl isocyanate;

[0011] The filler is modified diatomaceous earth, and the preparation process is as follows:

[0012] (1) reacting a flame retardant with a silane coupling agent to obtain a modified flame retardant;

[0013] (2) Add diatomaceous earth to an acidic solution, heat and stir, discharge, wash until neutral, and collect the product;

[0014] (3) calcining the product of step (2) and adding it to water, adding a surfactant, adjusting the pH of the solution to acidity, stirring the reaction, and after the reaction is completed, allowing the reaction solution to stand, collecting the solid product, washing the solid product, and vacuum drying to obtain pretreated diatomaceous earth;

[0015] (4) Adding the modified flame retardant of step (1) to the solution of diatomaceous earth pretreated in step (3), heating for reaction, and filtering, washing, and drying the reaction solution to obtain modified diatomaceous earth.

[0016] Preferably, in step (1), the molar ratio of the flame retardant to the silane coupling agent is 1:(1.5-2); the flame retardant is DOPO; the silane coupling agent is vinyl trimethoxysilane or γ-(methacryloyloxy)propyl trimethoxysilane, the reaction temperature is 140-150°C, and the reaction time is 10-15h.

[0017] Preferably, the acidic solution in step (2) is a nitric acid solution with a mass concentration of 10-20%; the mass concentration of the diatomaceous earth in the nitric acid solution is 1-5%; the temperature of the heating and stirring is 50-60° C., and the time is 3-5 hours.

[0018] Preferably, the calcination temperature in step (3) is 500-550°C, and the time is 1-3 hours; the mass ratio of the surfactant to the product of step (2) after calcination is 1:(0.5-0.7); the surfactant is sodium 1-butane sulfonate or sodium coconut sulfate; the stirring reaction time is 3-5 hours; and the solution pH is 2-3.

[0019] Preferably, in step (4), the mass ratio of the pretreated diatomaceous earth to the modified flame retardant is 1:(0.1-0.3); the mass concentration of the pretreated diatomaceous earth solution is 10-15%; the solvent of the pretreated diatomaceous earth solution is anhydrous ethanol, the reaction temperature is 80-90°C, and the reaction time is 10-15h.

[0020] Preferably, the polyol composition consists of polyether polyol and polyester polyol in a mass ratio of 1:(25-30).

[0021] Preferably, the polyether polyol is a polyether polyol using sucrose and glycerol as initiators; and the polyester polyol is a polyester polyol prepared by the reaction of pyromellitic dianhydride and butanediol.

[0022] More preferably, the polyether polyol is RF4110A; and the polyester polyol is PES504.

[0023] Preferably, the stabilizer is diphenylsilanediol; and the catalyst is one of N,N-dimethylcyclohexylamine, pentamethyldiethylenetriamine, and N,N-dimethylbenzylamine.

[0024] More preferably, the black material is selected from one of PM-200, PM-400, PM-700 and PM-2010 of Wanhua Company.

[0025] The second object of the present invention is achieved by adopting the following technical solution:

[0026] The preparation method of the above-mentioned polyurethane all-water combination material comprises the following steps:

[0027] The components of the white material are weighed according to the formula and mixed evenly to obtain the white material; the black material is weighed according to the formula to obtain the black material; and the white material and the black material are sealed and stored separately to obtain the white material.

[0028] The third object of the present invention is achieved by adopting the following technical solution:

[0029] The above-mentioned polyurethane all-water combination material is used in building thermal insulation materials.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The present invention provides a polyurethane all-water composite material, in which modified diatomaceous earth is introduced as a key component, and the modified diatomaceous earth is prepared by heating a modified flame retardant and pretreated diatomaceous earth. In the modified flame retardant, the silane coupling agent undergoes a condensation reaction with the hydroxyl group on the surface of the diatomaceous earth through its siloxane group to form a stable silicon-oxygen bond. This reaction not only enhances the bonding force between the diatomaceous earth and the flame retardant, thereby improving the flame retardancy of the polyurethane material, but also reduces the density of the hydrophilic groups on the surface of the diatomaceous earth, thereby improving the compatibility of the modified diatomaceous earth in the polymer matrix, supporting the pores, and ultimately improving the hardness of the product, thereby overcoming the deficiencies of all-water foamed polyurethane rigid foam in terms of flame retardancy and physical properties.

[0032] (2) The polyurethane all-water composite material sample of the present invention has high hardness and excellent flame retardancy, wherein the oxygen index is above 34.6% and the hardness is above 69. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an electron microscope image of the polyurethane all-water composition sample prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific embodiments. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments. The reagents or instruments used, unless otherwise specified, are conventional products obtained through commercial channels.

[0035] The mesh number of the diatomaceous earth used in the present invention is 40-50 meshes.

[0036] 1. Preparation Example

[0037] Preparation Example 1

[0038] A filler, which is modified diatomaceous earth, has a specific preparation process as follows:

[0039] (1) According to the molar ratio of DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) to vinyltrimethoxysilane of 1:1.7, DOPO and vinyltrimethoxysilane were placed in a three-necked flask, and reacted for 12 hours under a nitrogen atmosphere at a temperature of 145°C. After the reaction, a modified flame retardant was obtained;

[0040] (2) adding diatomaceous earth to a nitric acid solution with a mass concentration of 15% (the mass concentration of diatomaceous earth in the nitric acid solution is 3%), stirring at 55°C for 4 hours, discharging the material, washing with pure water until neutral, and collecting the product;

[0041] (3) transferring the product of step (2) to a tube furnace, raising the temperature of the tube furnace to 520° C., calcining for 1.5 h under nitrogen protection, cooling to room temperature, adding water, and then adding sodium coconut sulfate, wherein the mass ratio of sodium coconut sulfate to the product obtained in step (2) after calcination is 1:0.7, and adjusting the pH of the solution to 2.2, stirring the reaction at room temperature for 4 h, allowing the reaction solution to stand, collecting the solid product, washing the solid product, and vacuum drying to obtain pretreated diatomaceous earth;

[0042] (4) The modified flame retardant was added to a solution of pretreated diatomaceous earth with a mass concentration of 12% (the solvent was anhydrous ethanol) according to the mass ratio of the modified flame retardant to the pretreated diatomaceous earth of 1:0.2, and the reaction was carried out at 85°C for 14 hours. After the reaction was completed, the product was filtered, washed and dried to obtain modified diatomaceous earth.

[0043] Preparation Example 2

[0044] A filler, which is modified diatomaceous earth, has a specific preparation process as follows:

[0045] (1) DOPO and γ-(methacryloyloxy)propyltrimethoxysilane were placed in a three-necked flask at a molar ratio of 1:2, and reacted for 15 hours under a nitrogen atmosphere at a temperature of 140°C. After the reaction, a modified flame retardant was obtained;

[0046] (2) adding diatomaceous earth to a nitric acid solution with a mass concentration of 10% and a mass concentration of diatomaceous earth in the nitric acid solution of 5%, stirring at 50°C for 3 hours, discharging the material, washing with pure water until neutral, and collecting the product;

[0047] (3) transferring the product of step (2) to a tube furnace, raising the temperature of the tube furnace to 550° C., calcining for 1 h under nitrogen protection, cooling to room temperature, adding water, and then adding sodium coconut sulfate, wherein the mass ratio of sodium coconut sulfate to the product obtained in step (2) after calcination is 1:0.5, and adjusting the pH of the solution to 2, stirring the reaction at room temperature for 3 h, allowing the reaction solution to stand, collecting the solid product, washing the solid product, and vacuum drying to obtain pretreated diatomaceous earth;

[0048] (4) The modified flame retardant was added to a solution of pretreated diatomaceous earth with a mass concentration of 15% (the solvent was anhydrous ethanol) according to the mass ratio of the modified flame retardant to the pretreated diatomaceous earth of 1:0.3, and the reaction was carried out at 80°C for 15 hours. After the reaction was completed, the product was filtered, washed and dried to obtain modified diatomaceous earth.

[0049] Preparation Example 3

[0050] A filler, which is modified diatomaceous earth, has a specific preparation process as follows:

[0051] (1) According to the molar ratio of DOPO to vinyl trimethoxy silane of 1:1.5, DOPO and vinyl trimethoxy silane were placed in a three-necked flask, and reacted for 10 hours under a nitrogen atmosphere at a temperature of 150°C. After the reaction, a modified flame retardant was obtained;

[0052] (2) adding diatomaceous earth to a nitric acid solution with a mass concentration of 20% and a mass concentration of diatomaceous earth in the nitric acid solution of 1%, stirring at 60°C for 5 hours, discharging the material, washing with pure water until neutral, and collecting the product;

[0053] (3) transferring the product of step (2) to a tube furnace, raising the temperature of the tube furnace to 500° C., calcining for 3 h under nitrogen protection, cooling to room temperature, adding water, and then adding sodium 1-butane sulfonate, the mass ratio of sodium 1-butane sulfonate to the product obtained in step (2) after calcination is 1:0.6, and adjusting the pH of the solution to 3, stirring the reaction at room temperature for 5 h, allowing the reaction solution to stand, collecting the solid product, washing the solid product, and vacuum drying to obtain pretreated diatomaceous earth;

[0054] (4) The modified flame retardant was added to a solution of pretreated diatomaceous earth with a mass concentration of 10% (the solvent was anhydrous ethanol) according to the mass ratio of the modified flame retardant to the pretreated diatomaceous earth of 1:0.1, and the reaction was carried out at 90°C for 10 hours. After the reaction was completed, the product was filtered, washed, and dried to obtain modified diatomaceous earth.

[0055] Preparation Example 4

[0056] A filler, which differs from Preparation Example 1 in that:

[0057] Step (1) is the same as in Preparation Example 1, omitting steps (2) to (3);

[0058] In step (4), diatomaceous earth is used to replace the pretreated diatomaceous earth, and the rest is the same as in Preparation Example 1.

[0059] 2. Example

[0060] Example 1

[0061] A polyurethane all-water composite material consists of a white material and a black material, wherein the mass ratio of the white material to the black material is 1:0.9.

[0062] Among them, the black material is Wanhua PM-200, and the white material is composed of the following components: 80 parts of a polyol composition, 1 part of N,N-dimethylcyclohexylamine, 1.5 parts of diphenylsilanediol, 7 parts of the filler obtained in Preparation Example 1, and 2.5 parts of water.

[0063] The polyol composition consists of a polyether polyol and a polyester polyol in a mass ratio of 1:28, the polyether polyol is RF4110A, and the polyester polyol is PES504.

[0064] A method for preparing a polyurethane all-water composite material, the specific process is as follows:

[0065] The components of the white material are weighed according to the formula and mixed evenly to obtain the white material; the black material is weighed according to the formula to obtain the black material; and the white material and the black material are sealed and stored separately to obtain the white material.

[0066] Example 2

[0067] A polyurethane all-water composite material consists of a white material and a black material, wherein the mass ratio of the white material to the black material is 1:1.

[0068] The black material is Wanhua PM-400, and the white material is composed of the following components: 70 parts of a polyol composition, 1.5 parts of pentamethyldiethylenetriamine, 1 part of diphenylsilanediol, 6 parts of the filler obtained in Preparation Example 2, and 2 parts of water.

[0069] The polyol composition consists of polyether polyol and polyester polyol in a mass ratio of 1:25, the polyether polyol is RF4110A, and the polyester polyol is PES504.

[0070] A method for preparing a polyurethane all-water composite material, the specific process is as follows:

[0071] The components of the white material are weighed according to the formula and mixed evenly to obtain the white material; the black material is weighed according to the formula to obtain the black material; and the white material and the black material are sealed and stored separately to obtain the white material.

[0072] Example 3

[0073] A polyurethane all-water composite material consists of a white material and a black material, wherein the mass ratio of the white material to the black material is 1:0.8.

[0074] The black material is Wanhua PM-2010, and the white material is composed of the following components: 85 parts of a polyol composition, 0.5 parts of N,N-dimethylbenzylamine, 2 parts of diphenylsilanediol, 10 parts of the filler obtained in Preparation Example 3, and 3 parts of water.

[0075] The polyol composition consists of a polyether polyol and a polyester polyol in a mass ratio of 1:30, the polyether polyol is RF4110A, and the polyester polyol is PES504.

[0076] A method for preparing a polyurethane all-water composite material, the specific process is as follows:

[0077] The components of the white material are weighed according to the formula and mixed evenly to obtain the white material; the black material is weighed according to the formula to obtain the black material; and the white material and the black material are sealed and stored separately to obtain the white material.

[0078] 3. Comparative ratio

[0079] Comparative Example 1

[0080] The difference between Comparative Example 1 and Example 1 is that:

[0081] According to the mass ratio of DOPO to diatomaceous earth of 1:0.2, DOPO and diatomaceous earth were simply physically mixed to obtain the filler. The rest of the steps were the same as those in Example 1.

[0082] Comparative Example 2

[0083] The difference between Comparative Example 2 and Example 1 is:

[0084] According to the mass ratio of modified flame retardant to diatomaceous earth of 1:0.2, the modified flame retardant and diatomaceous earth are simply physically mixed to obtain a filler. The preparation process of the filler modified flame retardant is shown in Preparation Example 1, and the rest is consistent with Example 1.

[0085] Comparative Example 3

[0086] The difference between Comparative Example 3 and Example 1 is that:

[0087] According to the mass ratio of the modified flame retardant to the pretreated diatomaceous earth of 1:0.2, the modified flame retardant and the pretreated diatomaceous earth are simply physically mixed to obtain the filler. The preparation process of the modified flame retardant and the pretreated diatomaceous earth is shown in Preparation Example 1, and the rest is consistent with Example 1.

[0088] Comparative Example 4

[0089] The difference between Comparative Example 4 and Example 1 is that:

[0090] The filler in Comparative Example 4 is the filler prepared in Preparation Example 4, and the rest is the same as in Example 1.

[0091] Comparative Example 5

[0092] The difference between Comparative Example 5 and Example 1 is that:

[0093] The filler of Comparative Example 5 is diatomaceous earth, and the rest is consistent with Example 1.

[0094] 4. Test examples

[0095] The sealed black material and the white material of each embodiment and comparative example were mixed evenly, stirred for 30 seconds at a rotation speed of 3000 rpm, and foamed to obtain each group of polyurethane foam material samples. Figure 1 shown.

[0096] The mold size is 2000mm×200mm×50mm. The foam material samples prepared by using the polyurethane combination materials of Examples 1-3 and Comparative Examples 1-5 are divided into pieces with a size of 200mm×200mm×50mm to test the performance of each sample. The detection method of each test index is as follows:

[0097] Oxygen index: tested in accordance with GB / T 2406.2-2009;

[0098] Thermal conductivity: Tested in accordance with GB / T 10295-2008;

[0099] Compression strength: tested in accordance with GB / T 8813-2008;

[0100] Dimensional stability: tested in accordance with GB / T 8811-2008;

[0101] Hardness, Shore A: Tested in accordance with GB / T 2411-2008;

[0102] Closed porosity: tested in accordance with GB / T 10799. The results are shown in Table 1.

[0103] Table 1

[0104]

[0105] Combining the results of Examples 1-3, Comparative Example 5 and Comparative Example 1, it can be seen that the flame retardant properties of Examples 1-3 and Comparative Example 1 are better than those of Comparative Example 5, but the hardness and compressive strength of Comparative Example 5 are better than those of Comparative Example 1, indicating that directly adding flame retardants will indeed affect the physical properties of the product, while the hardness and compressive strength of Examples 1-3 are better than those of Comparative Example 5, which shows that the modified diatomaceous earth of the present invention can not only improve the flame retardancy of the polyurethane material, but also overcome the disadvantage of deteriorating the physical properties of the product caused by directly adding flame retardants.

[0106] The filler of the sample of comparative example 1 is composed of DOPO and diatomite, the filler of the sample of comparative example 2 is composed of modified flame retardant and diatomite, the filler of the sample of comparative example 3 is composed of modified flame retardant and pretreated diatomite, and the filler of comparative example 4 uses diatomite instead of pretreated diatomite during the preparation process. Combining the results of comparative examples 1-4 and embodiments 1-3, it can be seen that the modified diatomite prepared by heating reaction of modified flame retardant and pretreated diatomite in the present invention can significantly improve the flame retardancy and physical properties of the product. This is because in the modified flame retardant, the silane coupling agent reacts with the hydroxyl group on the surface of diatomite through its siloxane group to form a stable silicon oxygen bond. This reaction not only enhances the bonding force between diatomite and flame retardant, improves the flame retardancy of polyurethane materials, but also reduces the density of hydrophilic groups on the surface of diatomite, so that the compatibility of the modified diatomite in the polymer matrix is ​​improved, which can support the pores and ultimately improve the hardness of the product.

[0107] In addition, the samples obtained from the polyurethane all-water composite material of the present invention have low thermal conductivity, high dimensional stability and high closed porosity, indicating that the samples have good thermal insulation effects.

[0108] In summary, the polyurethane all-water combination material prepared by adopting the formula of the present invention has excellent properties.

[0109] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A polyurethane all-water composition, characterized in that: It includes white material and black material, and the mass ratio of the white material to the black material is 1: (0.8-1); the white material includes the following components: 70-85 parts of a polyol composition, 0.5-1.5 parts of a catalyst, 1-2 parts of a stabilizer, 6-10 parts of a filler, and 2-3 parts of water; the black material is polymethylene polyphenyl isocyanate; The filler is modified diatomaceous earth, and the preparation process is as follows: (1) reacting a flame retardant with a silane coupling agent to obtain a modified flame retardant; (2) Add diatomaceous earth to an acidic solution, heat and stir, discharge, wash until neutral, and collect the product; (3) calcining the product of step (2) and adding it to water, adding a surfactant, adjusting the pH of the solution to acidity, stirring the reaction, and after the reaction is completed, allowing the reaction solution to stand, collecting the solid product, washing the solid product, and vacuum drying to obtain pretreated diatomaceous earth; (4) adding the modified flame retardant of step (1) to the solution of diatomaceous earth pretreated in step (3), heating to react, filtering and collecting the product after the reaction is completed, washing and drying the product to obtain modified diatomaceous earth; Wherein, the molar ratio of the flame retardant and the silane coupling agent in step (1) is 1:(1.5-2); the flame retardant is DOPO; the silane coupling agent is vinyl trimethoxysilane or γ-(methacryloyloxy)propyl trimethoxysilane, the reaction temperature is 140-150°C, and the reaction time is 10-15h.

2. The polyurethane all-water composition according to claim 1, characterized in that: The acidic solution in step (2) is a nitric acid solution with a mass concentration of 10-20%; the mass concentration of the diatomaceous earth in the nitric acid solution is 1-5%; the temperature of the heating and stirring is 50-60° C., and the time is 3-5 hours.

3. The polyurethane all-water composition according to claim 1, characterized in that: In step (3), the product of step (2) is calcined at a temperature of 500-550° C. for 1-3 h; the mass ratio of the surfactant to the product of step (2) after calcination is 1:(0.5-0.7); the surfactant is sodium 1-butane sulfonate or sodium coconut sulfate; the stirring reaction time is 3-5 h; and the solution pH is 2-3.

4. The polyurethane all-water composition according to claim 1, characterized in that: The mass ratio of the pretreated diatomaceous earth to the modified flame retardant in step (4) is 1:(0.1-0.3); the mass concentration of the pretreated diatomaceous earth solution is 10-15%; the solvent of the pretreated diatomaceous earth solution is anhydrous ethanol; the reaction temperature is 80-90°C and the reaction time is 10-15h.

5. The polyurethane all-water composition according to claim 1, characterized in that: The polyol composition consists of polyether polyol and polyester polyol in a mass ratio of 1:(25-30).

6. The polyurethane all-water composition according to claim 5, characterized in that: The polyether polyol is a polyether polyol using sucrose and glycerol as initiators; the polyester polyol is a polyester polyol prepared by the reaction of pyromellitic dianhydride and butanediol.

7. The polyurethane all-water composition according to claim 1, characterized in that: The stabilizer is diphenylsilanediol; the catalyst is one of N,N-dimethylcyclohexylamine, pentamethyldiethylenetriamine and N,N-dimethylbenzylamine.

8. A method for preparing the polyurethane all-water composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: Weigh each component of the white material according to the formula and mix them evenly to obtain the white material; The black material is weighed according to the formula to obtain the black material; the white material and the black material are sealed and stored separately to obtain the black material.

9. An application of the polyurethane all-water composition according to any one of claims 1 to 7, characterized in that: Application in building insulation materials.

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