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CN-117645445-B - Polyurethane mortar composition, polyurethane mortar, preparation method of polyurethane mortar and method for preparing sound-insulating damping terrace coating

CN117645445BCN 117645445 BCN117645445 BCN 117645445BCN-117645445-B

Abstract

The invention relates to the technical field of sound-insulating and shock-absorbing terrace materials, and discloses a foaming modified polyurethane mortar composition, foaming modified polyurethane mortar, a preparation method of the foaming modified polyurethane mortar and a method for preparing a sound-insulating and shock-absorbing terrace coating. The foaming modified polyurethane mortar composition comprises a combination A, a combination B and a combination C, wherein the mass ratio of the sum of the combination A and the combination B to the mass ratio of the combination C is 1:0.25-1.25, the mass ratio of the combination A to the combination B is 0.6-1.8:1, the combination A comprises polyol, water, foam stabilizer and additive E, the combination B is polyisocyanate with average NCO functionality of more than or equal to 2, and the combination C comprises 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 high curing speed, high strength, no cracking, good sound insulation and high damping efficiency.

Inventors

  • TAN LIANG
  • PAN MINGDE
  • CHEN CHANGMING

Assignees

  • 中联重科新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20231019

Claims (11)

  1. 1. A method of preparing a foam-modified polyurethane mortar, the method comprising: (1) First mixing the components of the combination A to obtain a first component; (2) Performing second mixing on the first component and a second component to obtain a mixture I, wherein the second component is a combination B, and performing third mixing on all components in the combination C to obtain a third component; (3) Fourth mixing the third component with the mixture I to obtain foaming modified polyurethane mortar; The mass ratio of the sum of the masses of the combination A and the combination B to the mass of the combination C is 1:0.5-1, and the mass ratio of the combination A to the combination B is 0.8-1.1:1; The combination A contains polyalcohol, 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 the polyester polyol to the polyether polyol is 1:5-9; the 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 28-33wt%; the combination C contains a hydraulic binder, aggregate and an additive F; The aggregate is quartz sand with the average grain diameter of 50-120 mu m; The hydroxyl value of the polyether polyol is 50-250mgKOH/g, the viscosity at 25 ℃ is 150-1000 mPa.s, and the pH value is 5-8; The hydroxyl value of the polyester polyol is 110-330mgKOH/g, the viscosity at 25 ℃ is 1800-12000 mPa.s, and the acid value is less than or equal to 3mgKOH/g.
  2. 2. The method according to claim 1, wherein in combination a, the additive E is selected from at least one of an emulsifier, a plasticizer, a flame retardant.
  3. 3. The method according to claim 1, wherein the hydraulic binder is at least one cement selected from the group consisting of Portland cement, aluminate cement, sulphoaluminate cement, fluorochlorate cement, phosphate cement, and/or The aggregate is selected from at least one of quartz sand, gravel, broken stone and slag, and/or In the combination C, the additive F is at least one selected from water reducing agents and air entraining agents.
  4. 4. The method according to claim 1, wherein the polyol is contained in an amount of 45 to 70 parts by weight, the water is contained in an amount of 25 to 40 parts by weight, the foam stabilizer is contained in an amount of 0.5 to 3 parts by weight, and the additive E is contained in an amount of 1 to 15 parts by weight, based on 100 parts by weight of the total weight of the composition A, and/or The polymeric MDI is present in an amount of 50 to 100 parts by weight, the diphenylmethane diisocyanate is present in an amount of 0 to 50 parts by weight, based on 100 parts by weight of the total weight of the combination B, and/or 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 part by weight based on 100 parts by weight of the total weight of the combination C.
  5. 5. The method according to any one of claims 1 to 4, wherein the first mixing conditions comprise a stirring speed of 800 to 1500rpm, a time of 15 to 20min, a temperature of 15 to 35 ℃, and/or The second mixing condition comprises stirring at 800-1300rpm for 0.5-1min at 20-30deg.C, and/or The fourth mixing condition comprises stirring speed of 800-1200rpm, time of 1-3min, and temperature of 20-30deg.C.
  6. 6. A foam-modified polyurethane mortar produced by the method of any one of claims 1 to 5.
  7. 7. A method for preparing the sound-insulating and shock-absorbing floor coating is characterized by comprising the following steps of pouring and coating the foaming modified polyurethane mortar on a base material, and foaming and curing the foaming modified polyurethane mortar on the base material to obtain the sound-insulating and shock-absorbing floor coating.
  8. 8. The method of claim 7, further comprising the step of controlling the amount of the foam-modified polyurethane mortar so that the thickness of the soundproofing vibration-absorbing floor coating is 5-30mm.
  9. 9. The method of claim 8, wherein the sound-dampening floor coating has a thickness of 10-20mm.
  10. 10. The method of claim 7, wherein the foaming and curing conditions include an ambient temperature of 10-35 ℃ and an ambient humidity of 85% or less for 3-5 hours.
  11. 11. The method of claim 7, wherein the substrate is at least one of plain concrete, high-flow floor, cement-based self-leveling floor, and the substrate has a moisture content of <10%.

Description

Polyurethane mortar composition, polyurethane mortar, preparation method of polyurethane mortar and method for preparing sound-insulating damping terrace coating Technical Field The invention relates to the technical field of sound-insulating and shock-absorbing terrace materials, in particular to a foaming modified polyurethane mortar composition, foaming modified polyurethane mortar, a preparation method of the foaming modified polyurethane mortar and a method for preparing a sound-insulating and shock-absorbing terrace coating. Background Along with the improvement of the living standard of people, people pay more and more attention to the sound insulation performance of buildings. The attenuation of the energy of the structure-borne sound in the traditional building material is small, the propagation speed is faster than that in the air, and the propagation distance is longer. Therefore, the resident on the lower floor cannot hear the speaking sound of the resident on the upper floor, but the sound of the child running and jumping and the heel striking the ground of the resident on the upper floor has great influence on the resident on the lower floor. A heavy and hard concrete floor has good sound insulation against airborne sound, but poor sound insulation against impact sound. For floor sound insulation, the prior art mainly adopts sound insulation mortar and floating floor technology. The floating floor technology is to lay an elastic sound insulation layer on a bearing reinforced concrete floor, to make a fine stone reinforced concrete layer on the bearing reinforced concrete floor, and then to lay a floor. However, most of the elastic sound insulation layers are sound insulation pads, coiled materials and the like, the compatibility of the materials and cement mortar is poor, special bonding materials are needed to bond the materials and the base layer, hollowness is easy to generate, the flatness requirement on the base layer is high, cutting and splicing gap treatment are needed, if the sound bridge is improperly treated, the sound insulation effect is affected, and the materials are easy to damage, low in compressive strength and easy to deform in the transportation, installation and use processes. The sound insulation mortar is generally prepared by adding lightweight aggregate into mortar, has good compatibility with cement mortar and concrete base layers, is firmly bonded, can avoid hollowing phenomenon and is suitable for various base layer conditions, but the lightweight aggregate, such as elastic rubber particles, vitrified microbeads and other microporous materials, is mixed only through simple physical stirring, and is easy to cause strength reduction and long in maintenance time, and the construction period of other later procedures is influenced. CN110036049a discloses a multicomponent composition comprising a) a polyol component (a) comprising one or more polyols and water, B) a polyisocyanate component (B) comprising at least one polyisocyanate selected from the group consisting of Hexamethylene Diisocyanate (HDI) and an isocyanate-functional polyurethane prepolymer of at least one polyol and methylene diphenyl diisocyanate (MDI), and C) a powder component (C) comprising one or more hydraulic binders and one or more aggregates. The composition has improved crack bridging properties when used as a floor covering, as well as high chemical, abrasion and impact resistance. But the terrace has better compactness, no micropore structure in the terrace and no damping and sound insulation effects. Disclosure of Invention The invention aims to solve the problems of poor sound insulation effect and low strength of floor materials in floor slabs. In order to achieve the aim, the first aspect of the invention provides a foaming modified polyurethane mortar composition, which comprises a composition A, a composition B and a composition C which are respectively and independently stored or stored in a mixed mode, wherein the mass ratio of the sum of the composition A and the composition B to the mass of the composition C is 1:0.25-1.25, and the mass ratio of the composition A to the composition B is 0.6-1.8:1; The combination A contains polyalcohol, 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 the polyester polyol to the polyether polyol is 1:5-9; The composition B is polyisocyanate with the average NCO functionality of more than or equal to 2, wherein the polyisocyanate is at least one selected from diphenylmethane diisocyanate and polymeric MDI; the combination C contains a hydraulic binder, aggregate and an additive F. In a second aspect, the present invention provides a method for preparing a foam-modified polyurethane mortar, the method being carried out using the components of the foam-modified polyurethane mortar composition according to the first aspect,