Polyurethane mortar composition, polyurethane mortar and method for its preparation, method for preparing a sound and shock absorbing floor coating

Abstract

The application relates to the technical field of sound insulation and shock absorption floor materials, and discloses a foamed modified polyurethane mortar composition, a foamed modified polyurethane mortar, a preparation method of the foamed modified polyurethane mortar and a method for preparing a sound insulation and shock absorption floor coating. The foamed modified polyurethane mortar composition contains combination A, combination B and combination C, the mass ratio of the combination A, the combination B and the combination C is 1:0.25-1.25, the mass ratio of the combination A and the combination B is 0.6-1.8:1, the combination A contains polyhydric alcohol, water, a foam stabilizer and additive E, the combination B is a polyisocyanate with an average NCO functionality of greater than or equal to 2, and the combination C contains a hydraulic binder, aggregate and additive F. The polyurethane mortar composition can form a microporous polyurethane mortar floor coating, and the floor coating has the advantages of fast curing speed, high strength, no cracking, good sound insulation and high shock absorption efficiency.

Description

Technical Field

[0001] This invention relates to the field of sound insulation and vibration damping flooring materials, specifically to a foamed modified polyurethane mortar composition, a foamed modified polyurethane mortar and its preparation method, and a method for preparing a sound insulation and vibration damping flooring coating. Background Technology

[0002] As people's living standards improve, they are paying more and more attention to the sound insulation performance of buildings. The energy of solid-borne sound attenuates very little in traditional building materials, travels faster than in the air, and travels farther. Therefore, residents on lower floors generally cannot hear conversations from residents on upper floors, but the sounds of children running and jumping, and the sound of heels hitting the ground, can significantly affect residents on lower floors. Thick and solid concrete floor slabs are effective at insulating against airborne sound, but they are very ineffective at insulating against impact sounds.

[0003] For sound insulation of floor slabs, existing technologies mainly employ sound-insulating mortar and floating floor slab technology.

[0004] Floating floor technology typically involves laying an elastic sound insulation layer on a load-bearing reinforced concrete slab, followed by a fine aggregate reinforced concrete layer, and then laying the floor slab. However, elastic sound insulation layers are mostly sound insulation pads and rolls, which have poor compatibility with cement mortar and require special bonding materials to adhere to the substrate. This can easily lead to hollow areas, requires a high degree of flatness of the substrate, and necessitates cutting and splicing to treat gaps. Improper treatment can easily create sound bridges, affecting the sound insulation effect. Moreover, they are easily damaged during transportation, installation, and use, and have low compressive strength, making them prone to deformation.

[0005] Sound insulation mortar is generally made by adding lightweight aggregates to mortar. It has good compatibility with cement mortar and concrete base, and the bond is strong. It can avoid hollowing and adapt to various base conditions. However, lightweight aggregates, such as elastic rubber particles, vitrified microspheres and other microporous materials, are easily mixed by simple physical stirring, which can lead to a decrease in strength and a long curing time, affecting the construction period of other processes in the later stage.

[0006] CN110036049A discloses a multi-component composition comprising: A) a polyol component (A) containing one or more polyols and water; B) a polyisocyanate component (B) containing at least one polyisocyanate selected from hexamethylene diisocyanate (HDI) and at least one polyol and methylene diphenyl diisocyanate (MDI) of an isocyanate-functionalized polyurethane prepolymer; and C) a powder component (C) containing one or more hydraulic binders and one or more aggregates. When used as a floor covering, this composition exhibits improved crack bridging properties, as well as high chemical resistance, abrasion resistance, and impact resistance. However, the floor has good density, lacks an internal microporous structure, and offers no vibration damping or sound insulation effect. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems of poor sound insulation and low strength of flooring materials.

[0008] To achieve the above objectives, the first aspect of the present invention provides a foamed modified polyurethane mortar composition, which contains the following components stored independently or in combination: combination A, combination B, and combination C, wherein the ratio of the sum of the masses of combination A and combination B to the mass of combination C is 1:0.25-1.25; and the mass ratio of combination A to combination B is 0.6-1.8:1;

[0009] Combination A contains polyol, water, foam stabilizer, and additive E;

[0010] The foam stabilizer is an organosilicon foam stabilizer;

[0011] The polyol is a combination of polyester polyol and polyether polyol, and the ratio of polyester polyol to polyether polyol is 1:5-9.

[0012] Combination B is a polyisocyanate with an average NCO functionality ≥2; the polyisocyanate is selected from at least one of diphenylmethane diisocyanate and polymeric MDI.

[0013] The combination C contains a hydraulic binder, aggregates, and additive F.

[0014] A second aspect of the present invention provides a method for preparing a foamed modified polyurethane mortar, the method comprising using the components of the foamed modified polyurethane mortar composition described in the first aspect; including:

[0015] (1) Mix the components of combination A in the first step to obtain the first component;

[0016] (2) The first component and the second component are mixed for a second time to obtain mixture I; the second component is combination B in the polyurethane mortar composition; and the components in combination C are mixed for a third time to obtain the third component;

[0017] (3) The third component is mixed with the mixture I for the fourth time to obtain foamed modified polyurethane mortar.

[0018] A third aspect of the present invention provides a foamed modified polyurethane mortar prepared by the method described in the second aspect.

[0019] The fourth aspect of the present invention provides a method for preparing a sound-insulating and vibration-damping floor coating, the method comprising the following steps: pouring and coating the foamed modified polyurethane mortar described in the third aspect onto a substrate, wherein the foamed modified polyurethane mortar on the substrate is foamed and cured to obtain a sound-insulating and vibration-damping floor coating.

[0020] The foamed modified polyurethane mortar composition provided by this invention contains combination A, combination B, and combination C in specific proportions. Through polyurethane micro-foaming technology, the mortar hydration reaction is carried out simultaneously to form a microporous polyurethane mortar floor coating. This floor coating has a fast curing speed (the next construction can be carried out after 5 hours), high strength, no cracking, good sound insulation, and high vibration reduction efficiency. Detailed Implementation

[0021] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0022] As previously stated, a first aspect of the present invention provides a foamed modified polyurethane mortar composition comprising the following components, each stored independently or in combination: combination A, combination B, and combination C, wherein the mass ratio of the sum of the masses of combination A and combination B to the mass of combination C is 1:0.25-1.25; and the mass ratio of combination A to combination B is 0.6-1.8:1.

[0023] Combination A contains polyol, water, foam stabilizer, and additive E;

[0024] The foam stabilizer is an organosilicon foam stabilizer;

[0025] The polyol is a combination of polyester polyol and polyether polyol, and the ratio of polyester polyol to polyether polyol is 1:5-9.

[0026] Combination B is a polyisocyanate with an average NCO functionality ≥2; the polyisocyanate is selected from at least one of diphenylmethane diisocyanate and polymeric MDI.

[0027] The combination C contains a hydraulic binder, aggregates, and additive F.

[0028] Preferably, the ratio of the sum of the masses of combination A and combination B to the mass of combination C is 1:0.5-1; and the mass ratio of combination A to combination B is 0.8-1.1:1. The inventors of this invention have discovered that, under this preferred condition, the obtained foamed modified polyurethane mortar exhibits better sound insulation and higher strength.

[0029] In a preferred embodiment, combination B is polymeric MDI; and the average NCO functionality of the polymeric MDI is 2.3-2.7, and the mass fraction of NCO is 28-33 wt%. The inventors of this invention have found that, under this preferred embodiment, the obtained foamed modified polyurethane mortar exhibits better sound insulation performance.

[0030] In this invention, the polymeric MDI is a mixture containing polymethylene polyphenyl isocyanate and diphenylmethane diisocyanate.

[0031] More preferably, the polymeric MDI is WANNATE PM-200 polymeric MDI produced by Wanhua Chemical Company.

[0032] Preferably, the foam stabilizer is selected from Niax L-580 produced by Momentive Corporation and TEGOSTAB B8123 produced by Evonik Specialty Chemicals Ltd. The inventors have found that this preferred configuration is beneficial for stabilizing the foaming ratio, thereby improving the sound insulation and strength of the foamed modified polyurethane mortar.

[0033] Preferably, the polyether polyol has a hydroxyl value of 25-410 mg KOH / g, a viscosity of 50-8000 mPa·s at 25°C, and a pH value of 5-9. More preferably, the polyether polyol has a hydroxyl value of 50-250 mg KOH / g, a viscosity of 150-1000 mPa·s at 25°C, and a pH value of 5-8.

[0034] Preferably, the polyester polyol has a hydroxyl value of 110-330 mgKOH / g, a viscosity of 1800-12000 mPa·s at 25°C, and an acid value ≤3 mgKOH / g.

[0035] In a preferred embodiment, in combination A, the additive E is selected from at least one of emulsifiers, plasticizers, and flame retardants.

[0036] Preferably, the emulsifier accounts for 1-10 wt% of the additive E; and the plasticizer accounts for 90-99 wt% of the additive E.

[0037] Preferably, the emulsifier is selected from at least one emulsifier manufactured by Evonik Specialty Chemicals Ltd. with the brand names REWOQUAT CQ100s and REWOQUAT CQ AL100.

[0038] In a preferred embodiment, the plasticizer is selected from at least one of tributyl acetyl citrate (ATBC) and trimethylpentanediol diisobutyrate (TXIB).

[0039] Preferably, the hydraulic binder is selected from at least one type of cement, including silicate cement, aluminate cement, sulfoaluminate cement, fluorochlorate cement, and phosphate cement.

[0040] Preferably, the aggregate is selected from at least one of quartz sand, gravel, crushed stone, and slag.

[0041] In a preferred embodiment, in combination C, the additive F is selected from at least one of water-reducing agents and air-entraining agents.

[0042] Preferably, the water-reducing agent accounts for 94-97 wt% of the additive; the air-entraining agent accounts for 3-6 wt% of the additive.

[0043] In a preferred embodiment, the water-reducing agent is selected from at least one of the brands 540P and 530P manufactured by Sika Company.

[0044] In a preferred embodiment, the air-entraining agent is selected from at least one of the following: OSB produced by Guangzhou Jiantubao Building Materials Co., Ltd., and AE1420 produced by Solvay Group.

[0045] In a preferred embodiment, the aggregate is quartz sand with an average particle size of 50-120 μm. The inventors have found that, in this preferred embodiment, using quartz sand of a single particle size in combination C results in foamed modified polyurethane mortar with better sound insulation and higher strength.

[0046] According to a preferred embodiment, based on a total weight of 100 parts by weight of combination A, the content of the polyol is 45-70 parts by weight, the content of the water is 25-40 parts by weight, the content of the foam stabilizer is 0.5-3 parts by weight, and the content of the additive E is 1-15 parts by weight.

[0047] According to another preferred embodiment, based on a total weight of 100 parts by weight of combination B, the content of the polymeric MDI is 50-100 parts by weight, and the content of the diphenylmethane diisocyanate is 0-50 parts by weight.

[0048] Preferably, based on 100 parts by weight of the total weight of combination C, the content of the hydraulic binder is 40-50 parts by weight, the content of the aggregate is 49-60 parts by weight, and the content of the additive F is 0.01-1 parts by weight.

[0049] During the research process, the inventors discovered that when the content of each component in combination A, combination B, and combination C is within a specific range, the resulting foamed modified polyurethane mortar has better sound insulation and higher strength.

[0050] The water used in this invention can react with polyisocyanates as a chemical foaming agent and also participate in the cement hydration reaction. By combining polyurethane cast-in-place foaming technology with mortar hydration reaction, a microporous foamed polyurethane mortar floor curing material is formed. This material can improve the sound insulation and vibration reduction effect of pure mortar concrete flooring and avoid the risk of cracking due to insufficient toughness of pure mortar concrete flooring.

[0051] As previously described, a second aspect of the present invention provides a method for preparing a foamed modified polyurethane mortar, the method comprising using the components of the foamed modified polyurethane mortar composition described in the first aspect; including:

[0052] (1) Mix the components of combination A in the first step to obtain the first component;

[0053] (2) The first component and the second component are mixed for a second time to obtain mixture I; the second component is combination B in the polyurethane mortar composition; and the components in combination C are mixed for a third time to obtain the third component;

[0054] (3) The third component is mixed with the mixture I for the fourth time to obtain foamed modified polyurethane mortar.

[0055] It should be noted that the definitions and dosages of each component in combinations A, B, and C are the same as those of the corresponding components described in the first aspect, and will not be repeated here. Those skilled in the art should not understand this as a limitation of the present invention.

[0056] According to a preferred embodiment, the conditions for the first mixing include: a stirring speed of 800-1500 rpm, a time of 15-20 min, and a temperature of 15-35℃.

[0057] According to another preferred embodiment, the conditions for the second mixing include: a stirring speed of 800-1300 rpm, a time of 0.5-1 min, and a temperature of 20-30℃.

[0058] This invention does not impose any particular requirements on the third mixing method, as long as the components in combination C are mixed evenly. Those skilled in the art can perform this mixing using known techniques. The following description of this invention provides a preferred embodiment, which should not be construed as a limitation of the invention.

[0059] In a preferred embodiment, the conditions for the fourth mixing include: a stirring speed of 800-1200 rpm, a time of 1-3 min, and a temperature of 20-30℃.

[0060] As previously stated, a third aspect of the present invention provides a foamed modified polyurethane mortar prepared by the method described in the second aspect.

[0061] As mentioned above, the fourth aspect of the present invention provides a method for preparing a sound-insulating and vibration-damping floor coating, the method comprising the following steps: pouring and coating the foamed modified polyurethane mortar described in the third aspect onto a substrate, wherein the foamed modified polyurethane mortar on the substrate is foamed and cured to obtain a sound-insulating and vibration-damping floor coating.

[0062] Preferably, the amount of the foamed modified polyurethane mortar is controlled so that the thickness of the sound insulation and vibration damping floor coating is 5-30mm, preferably 10-20mm.

[0063] In a preferred embodiment, the conditions for foaming and curing include: an ambient temperature of 10-35℃, an ambient humidity of ≤85%, and a time of 3-5 hours.

[0064] Preferably, the substrate is at least one of plain concrete, high-flow flooring, and cement-based self-leveling flooring; the moisture content of the substrate is <10%.

[0065] The present invention will be described in detail below through examples. Unless otherwise specified, the instruments, reagents, and materials involved in the following examples are all conventional instruments, reagents, and materials already existing in the prior art and can be obtained through legitimate commercial channels. Unless otherwise specified, the experimental methods and detection methods involved in the following examples are all conventional experimental methods and detection methods already existing in the prior art.

[0066] The main materials used in the examples and comparative examples are all commercially available, as detailed below.

[0067] Combination A:

[0068] Polyols:

[0069] Polyether polyol I: hydroxyl value 54.5-57.5 KOH / g, viscosity at 25℃ 270-370 mPa·s, pH 5-7.5, purchased from Wanhua Chemical Group Co., Ltd., brand name... C2020;

[0070] Polyether polyol II: hydroxyl value 280±10 mgKOH / g, viscosity at 25℃ 40~140 mPa·s, pH value 5~7, purchased from Wanhua Chemical Group Co., Ltd., brand name... C2004;

[0071] Polyester polyol I: hydroxyl value 300-330 mg KOH / g, viscosity at 25℃ 2756 mPa·s, acid value 2.0-3.0 KOH / g, purchased from Stepan Chemicals Ltd., brand name [not specified]. PS3152;

[0072] Polyester polyol II: hydroxyl value 190-200 mg KOH / g, viscosity at 25℃ 23000 mPa·s, acid value 1.0 KOH / g, purchased from Stepan Chemicals Ltd., brand name... PS2002;

[0073] Foam stabilizer:

[0074] Foam stabilizer I: Organosilicon foam stabilizer, brand name Niax L-580, purchased from Momentive Advanced Materials Group;

[0075] Foam Stabilizer II: Stearamide polyoxyethylene ether, brand name FENTAMIDE SA-50, purchased from Solvay Chemicals Group;

[0076] Additive E:

[0077] Emulsifier: Rewoquat CQ100s, purchased from Evonik Specialty Chemicals Ltd.;

[0078] Plasticizer: Tributyl acetylacetonate (ATBC), brand name LM40, purchased from Jiangsu Raymond New Materials Co., Ltd.;

[0079] Combination B:

[0080] Polyisocyanates:

[0081] Polymer MDI: Average NCO functionality is 2.6-2.7, NCO mass fraction is 30.2-32.0 wt%, grade PM-200 was purchased from Wanhua Chemical Group Co., Ltd.

[0082] Hexamethylene diisocyanate (HDI): Average NCO functionality is 2, NCO mass fraction is 49.7 wt%, grade HDI, purchased from Wanhua Chemical Group Co., Ltd.

[0083] Combination C:

[0084] Hydraulic adhesives:

[0085] Cement I: Ordinary Portland white cement 52.5, purchased from Jiangxi Yingshan White Cement Co., Ltd.;

[0086] aggregate:

[0087] Quartz sand I: average particle size 74μm, purchased from Chaling Zeda New Material Technology Co., Ltd.;

[0088] Quartz Sand II: Average particle size is 150μm, purchased from Chaling Zeda New Material Technology Co., Ltd.

[0089] Additive F:

[0090] Water-reducing agent: Polycarboxylate superplasticizer 540P; purchased from Sika Company;

[0091] Air-entraining agent: RHODOLINE AE 1420; purchased from Solvay Chemicals.

[0092] Example 1

[0093] The formulation of this embodiment is shown in Table 1.

[0094] Table 1

[0095]

[0096]

[0097] Preparation method of foamed modified polyurethane mortar:

[0098] (1) Mix the components of combination A in the first step to obtain the first component;

[0099] The conditions for the first mixing were: stirring speed of 1000 rpm, time of 20 min, and temperature of 30℃.

[0100] (2) The first component and the second component are mixed for a second time to obtain mixture I; the second component is combination B in the polyurethane mortar composition; and the components in combination C are mixed for a third time to obtain the third component;

[0101] The conditions for the second mixing were: stirring speed of 1200 rpm, time of 0.5 min, and temperature of 25℃.

[0102] The conditions for the third mixing are: stirring speed of 800 rpm, time of 2 min, and temperature of 25℃;

[0103] (3) The third component is mixed with the mixture I for the fourth time to obtain foamed modified polyurethane mortar Y1.

[0104] The fourth mixing conditions were: stirring speed of 1200 rpm, time of 1 min, and temperature of 20℃.

[0105] Example 2

[0106] The formulation for this embodiment is shown in Table 2.

[0107] Table 2

[0108]

[0109]

[0110] Preparation method of foamed modified polyurethane mortar:

[0111] (1) Mix the components of combination A in the first step to obtain the first component;

[0112] The conditions for the first mixing were: stirring speed of 1500 rpm, time of 15 min, and temperature of 20℃.

[0113] (2) The first component and the second component are mixed for a second time to obtain mixture I; the second component is combination B in the polyurethane mortar composition; and the components in combination C are mixed for a third time to obtain the third component;

[0114] The conditions for the second mixing were: stirring speed of 900 rpm, time of 1 min, and temperature of 20℃.

[0115] The conditions for the third mixing are: stirring speed of 800 rpm, time of 2 min, and temperature of 25℃;

[0116] (3) The third component is mixed with the mixture I in a fourth mixing process to obtain foamed modified polyurethane mortar Y2;

[0117] The fourth mixing conditions were: stirring speed of 850 rpm, time of 3 min, and temperature of 30℃.

[0118] Example 3

[0119] The formulation of this embodiment is shown in Table 3.

[0120] Table 3

[0121]

[0122]

[0123] Preparation method of foamed modified polyurethane mortar:

[0124] (1) Mix the components of combination A in the first step to obtain the first component;

[0125] The conditions for the first mixing were: stirring speed of 800 rpm, time of 20 min, and temperature of 25℃.

[0126] (2) The first component and the second component are mixed for a second time to obtain mixture I; the second component is combination B in the polyurethane mortar composition; and the components in combination C are mixed for a third time to obtain the third component;

[0127] The conditions for the second mixing were: stirring speed of 1100 rpm, time of 1 min, and temperature of 25℃.

[0128] The conditions for the third mixing are: stirring speed of 800 rpm, time of 2 min, and temperature of 25℃;

[0129] (3) The third component is mixed with the mixture I for the fourth time to obtain foamed modified polyurethane mortar Y3.

[0130] The fourth mixing conditions were: stirring speed of 1000 rpm, time of 3 min, and temperature of 20℃.

[0131] Example 4

[0132] This embodiment uses a similar formulation and method as Example 1 to prepare foamed modified polyurethane mortar, except that: the mass of quartz sand I in combination C is replaced with quartz sand II; foamed modified polyurethane mortar Y4 is prepared.

[0133] Example 5

[0134] This embodiment uses a similar formulation and method to Example 1 to prepare foamed modified polyurethane mortar, except that: the ingredients are mixed according to the ratio of the sum of the masses of combination A and combination B to the mass of combination C of 1:1.25, and the mass ratio of combination A to combination B of 1:1; foamed modified polyurethane mortar Y5 is prepared.

[0135] Example 6

[0136] This embodiment uses a similar formulation and method as Example 1 to prepare foamed modified polyurethane mortar, except that in combination A, polyether polyol I is replaced by polyether polyol II by an equal mass, and polyester polyol I is replaced by polyester polyol II by an equal mass; foamed modified polyurethane mortar Y6 is prepared.

[0137] Comparative Example 1

[0138] This comparative example uses a similar formulation and method to Example 1 to prepare foamed modified polyurethane mortar. The difference is that foam stabilizer I is not added in this comparative example, and water is used to replace foam stabilizer I by the same mass.

[0139] The remaining steps are the same as in Example 1, and foamed modified polyurethane mortar DY1 is obtained.

[0140] Comparative Example 2

[0141] This comparative example uses a similar formulation and method to prepare foamed modified polyurethane mortar as in Example 1, except that foam stabilizer I is replaced by foam stabilizer II by mass.

[0142] The remaining steps are the same as in Example 1, and foamed modified polyurethane mortar DY2 is obtained.

[0143] Comparative Example 3

[0144] This comparative example uses a similar formulation and method to Example 1 to prepare foamed modified polyurethane mortar, except that: the amount of polyether polyol I is 55 parts by weight and the amount of polyester polyol I is 5 parts by weight.

[0145] The remaining steps are the same as in Example 1, and foamed modified polyurethane mortar DY3 is obtained.

[0146] Comparative Example 4

[0147] This comparative example uses a similar formulation and method to prepare foamed modified polyurethane mortar as Example 1, except that the same mass of polymeric MDI is replaced with HDI.

[0148] The remaining steps are the same as in Example 1, and foamed modified polyurethane mortar DY4 is obtained.

[0149] Test Example 1

[0150] Prepare the sound-insulating and vibration-damping floor coating M1 as follows:

[0151] (1) The foamed modified polyurethane mortar Y1 prepared in Example 1 above is poured and coated onto the substrate (plain concrete board, size 400mm×400mm×40mm, water content 5%). After the foamed modified polyurethane mortar on the substrate is foamed and cured, the sound insulation and vibration reduction floor coating M1 is obtained.

[0152] The amount of foamed modified polyurethane mortar was controlled to make the thickness of the sound insulation and vibration damping floor coating 20mm.

[0153] The conditions for foam curing are: ambient temperature of 30℃, ambient humidity of 65%, and time of 5 hours.

[0154] The foamed modified polyurethane mortars obtained in the other examples were used to prepare sound-insulating and vibration-damping floor coatings using the same operation as described above, resulting in sound-insulating and vibration-damping floor coatings M2, M3, M4, M5, M6, DM1 to DM4, respectively.

[0155] The performance of the sound insulation and vibration damping flooring materials prepared above was tested, and the specific results are shown in Table 4.

[0156] Among them, the bonding tensile strength and volatile organic compound content were tested in accordance with GBT 22374-2018 "Floor Coating Materials" standard; the flexural strength and compressive strength at 24h and 7d were tested in accordance with GBT 17671-1999 "Test Method for Strength of Cement Mortar" standard; the foaming ratio was tested according to the dry density method in JGT 266-2011 "Foamed Concrete"; the impact sound insulation improvement was tested in accordance with GB / T19889.6-2005 "Laboratory Measurement Standard for Impact Sound Insulation of Floor Slabs"; and the airborne sound insulation was tested in accordance with GB / T 19889.3-2005 "Laboratory Measurement Standard for Airborne Sound Insulation of Building Components".

[0157] Table 4

[0158]

[0159] Continued from Table 4

[0160]

[0161]

[0162] The test results in the table above show that when the foamed modified polyurethane mortar containing combination A, combination B, and combination C provided by this invention is used for sound insulation and vibration damping floor coating, the sound insulation effect and compressive strength of the floor coating can be improved through the synergistic effect of each component in combination A, combination B, and combination C.

[0163] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing foamed modified polyurethane mortar, characterized in that, The method includes: (1) Mix the components of combination A to obtain the first component; (2) The first component and the second component are mixed for a second time to obtain mixture I; the second component is combination B; and the components in combination C are mixed for a third time to obtain the third component; (3) The third component is mixed with the mixture I for the fourth time to obtain foamed modified polyurethane mortar; The ratio of the sum of the masses of combination A and combination B to the mass of combination C is 1:0.5-1; and the mass ratio of combination A to combination B is 0.8-1.1:

1. Combination A contains polyol, water, foam stabilizer, and additive E; The foam stabilizer is an organosilicon foam stabilizer; The polyol is a combination of polyester polyol and polyether polyol, and the ratio of polyester polyol to polyether polyol is 1:5-9. Combination B is polymeric MDI; and the average NCO functionality of the polymeric MDI is 2.3-2.7; the mass fraction of NCO is 28-33 wt%. The combination C contains a hydraulic binder, aggregates, and additive F; The aggregate is quartz sand with an average particle size of 50-120μm; The polyether polyol has a hydroxyl value of 50-250 mgKOH / g, a viscosity of 150-1000 mPa·s at 25°C, and a pH value of 5-8. The polyester polyol has a hydroxyl value of 110-330 mgKOH / g, a viscosity of 1800-12000 mPa·s at 25°C, and an acid value ≤3 mgKOH / g.

2. The method according to claim 1, characterized in that, In combination A, the additive E is selected from at least one of emulsifiers, plasticizers, and flame retardants.

3. The method according to claim 1, characterized in that, The hydraulic binder is selected from at least one type of cement selected from silicate cement, aluminate cement, sulfoaluminate cement, fluorochlorate cement, and phosphate cement; and / or The aggregate is selected from at least one of quartz sand, gravel, crushed stone, and slag; and / or In combination C, the additive F is selected from at least one of water-reducing agents and air-entraining agents.

4. The method according to claim 1, characterized in that, Based on 100 parts by weight of combination A, the content of the polyol is 45-70 parts by weight, the content of water is 25-40 parts by weight, the content of the foam stabilizer is 0.5-3 parts by weight, and the content of additive E is 1-15 parts by weight; and / or Based on a total weight of 100 parts by weight of combination B, the content of the polymeric MDI is 50-100 parts by weight, and the content of the diphenylmethane diisocyanate is 0-50 parts by weight; and / or Based on a total weight of 100 parts by weight for combination C, the content of the hydraulic binder is 40-50 parts by weight, the content of the aggregate is 49-60 parts by weight, and the content of the additive F is 0.01-1 parts by weight.

5. The method according to any one of claims 1-4, characterized in that, The conditions for the first mixing include: a stirring speed of 800-1500 rpm, a time of 15-20 min, and a temperature of 15-35℃; and / or The second mixing conditions include: a stirring speed of 800-1300 rpm, a time of 0.5-1 min, and a temperature of 20-30℃; and / or The conditions for the fourth mixing include: a stirring speed of 800-1200 rpm, a time of 1-3 min, and a temperature of 20-30℃.

6. A foamed modified polyurethane mortar prepared by the method according to any one of claims 1-5.

7. A method for preparing a sound-insulating and vibration-damping floor coating, characterized in that, The method includes the following steps: pouring and coating the foamed modified polyurethane mortar of claim 6 onto a substrate, and after the foamed modified polyurethane mortar on the substrate is foamed and cured, a sound-insulating and vibration-damping floor coating is obtained.

8. The method according to claim 7, characterized in that, The method further includes the following steps: controlling the amount of the foamed modified polyurethane mortar so that the thickness of the sound insulation and vibration damping floor coating is 5-30mm.

9. The method according to claim 8, characterized in that, The thickness of the sound-insulating and vibration-damping floor coating is 10-20mm.

10. The method according to claim 7, characterized in that, The conditions for foaming and curing include: ambient temperature of 10-35℃, ambient humidity of ≤85%, and time of 3-5 hours.

11. The method according to claim 7, characterized in that, The substrate is at least one of plain concrete, high-flow flooring, and cement-based self-leveling flooring; the moisture content of the substrate is <10%.

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