Search

CN-121991316-A - Water-based polyurethane mortar floor emulsion and application thereof

CN121991316ACN 121991316 ACN121991316 ACN 121991316ACN-121991316-A

Abstract

The invention relates to a waterborne polyurethane mortar floor emulsion and application thereof, wherein the waterborne polyurethane mortar floor emulsion comprises first polyester polyol, bio-based polyester polyol, defoamer, dispersant, emulsifier, dihydric alcohol, plasticizer, glycidyl ether and water. According to the invention, the star-shaped structural polyol is introduced to serve as a core skeleton with high functionality, a rigid network with high crosslinking density is constructed during curing, the excellent surface hardness and scratch resistance of the terrace are directly endowed, meanwhile, the three-dimensional spherical structure of the polyol forms a stable conformation in emulsion particles, particle coalescence in the storage process is effectively inhibited, so that long-term stability is ensured, and the alkyl glycidyl ether is introduced to serve as a bridge and lubricate, so that the surface scratch resistance is improved and the anchoring effect of the emulsion particle interface is enhanced. Finally, the obvious improvement of emulsion storage stability (more than or equal to 15 days) and terrace surface hardness (Mohs hardness > 5) is realized.

Inventors

  • MA JUN
  • OUYANG JIE
  • CHEN LINLIN

Assignees

  • 广州冠志新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260210

Claims (10)

  1. 1. The water-based polyurethane mortar floor emulsion is characterized by comprising the following components: The mass ratio of the 9 groups of raw materials is (15-50): (0-20): (1.5-3): (0.1-0.6): (0-0.8): (3-12): (15-25): (5-15): (25-35); The first polyester polyol is prepared by the following method: mixing and reacting a first small molecular polyol with a monoacid to obtain a polyester polyol intermediate; Adding a crude dimer acid mixture into the polyester polyol intermediate, and mixing and reacting to obtain the first polyester polyol; the mono-acid comprises at least one of n-octanoic acid, iso-octanoic acid, lauric acid, palmitoleic acid, linoleic acid, stearic acid and oleic acid; the first small molecular polyol comprises at least one of trimethylolpropane, trimethylolethane, pentaerythritol and dipentaerythritol; The crude dimer acid mixture comprises the single acid, the dimer acid and the trimer acid, wherein the single acid accounts for less than or equal to 30 wt%, the dimer acid accounts for more than or equal to 55 wt%, and the trimer acid accounts for less than or equal to 20 wt%.
  2. 2. The aqueous polyurethane mortar floor emulsion of claim 1, wherein the first polyester polyol has a hydroxyl value of 100 to 240mgkoh/g and an average functionality of 2.2 to 3.5.
  3. 3. The aqueous polyurethane mortar floor emulsion of claim 2, wherein the method of preparing the first polyester polyol further comprises the steps of: Mixing the first micromolecular polyol with the monoacid, adding a catalyst, vacuumizing, reacting for 3-16 hours at the temperature of 180-240 ℃, and when the acid value of a reaction system is lower than 3mgKOH/g, ending the reaction to obtain the polyester polyol intermediate; Adding the crude dimer acid mixture into the polyester polyol intermediate, continuing to react for 3-16 hours at the temperature of 180-240 ℃, and ending the reaction when the acid value of the reaction system is lower than 3mgKOH/g and the hydroxyl value of the reaction system reaches 100-240 mgKOH/g to obtain the first polyester polyol; the catalyst comprises at least one of tetrabutyl titanate, tetraisopropyl titanate, tetraoctyl titanate, tetrabutyl zirconate, tetraisopropyl zirconate, dibutyl tin dilaurate and antimony zinc oxide.
  4. 4. The aqueous polyurethane mortar floor emulsion of claim 3, wherein the method of preparing the first polyester polyol further comprises the steps of: Mixing and reacting the first small molecular polyol, the second small molecular polyol and the monoacid to obtain a polyester polyol intermediate; the second small molecule polyol is at least one of 1, 3-butanediol, 1, 4-butanediol, 1, 6-hexanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol and tripropylene glycol; The molar ratio of the total substances of the first small molecular polyol and the second small molecular polyol to the monoacid is 1:1-4, the polyester polyol intermediate contains at least two hydroxyl groups, and the molar ratio of carboxyl groups contained in the crude dimer acid mixture to hydroxyl groups contained in the polyester polyol intermediate is (0.45-0.55): 1.
  5. 5. The aqueous polyurethane mortar floor emulsion of claim 1, wherein the aqueous polyurethane mortar floor emulsion has a solids content of 65-75wt.% and a hydroxyl content of 2-4wt.%.
  6. 6. The aqueous polyurethane mortar floor emulsion of claim 1, wherein the bio-based polyester polyol is at least one of basf Sovermol 750, sovermol 1006, and Sovermol 908 or is primary refined castor oil. The defoaming agent is an organosilicon modified defoaming agent, and the organosilicon modified defoaming agent is at least one of CDI4900 and DigaTEGO-900 of Shenzhen sea Wei auxiliary agent new material science and technology Co. The dispersing agent is at least one of CDI104 and CDI101 of Shenzhen sea wire auxiliary agent new material science and technology Co.Ltd; The emulsifier is at least one of Pasteur Lutensol TO5, lutensol TO7, lutensol TO9 and REWOQUAT ℃ CQ 100S; the dihydric alcohol is at least one of triethylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol-600, polypropylene glycol-1000 and polypropylene glycol-2000; The plasticizer includes TXIB.
  7. 7. The application of the aqueous polyurethane mortar floor emulsion according to any one of claims 1-6, comprising the following steps: mixing water-based polyurethane mortar floor emulsion: 15-50 parts of first polyester polyol, 0-20 parts of bio-based polyester polyol, 1.5-3 parts of defoamer, 0.1-0.6 part of dispersing agent, 0-0.8 part of emulsifier, 3-12 parts of dihydric alcohol, 5-15 parts of glycidyl ether and 15-25 parts of plasticizer are placed into a first container, the temperature is less than 50 ℃, the mixture is dispersed at 10-15 min parts at a stirring speed of 1000-1200rpm, then 25-35 parts of water is added, and the mixture is dispersed at 5-10 min parts at a stirring speed of 400-600rpm, so that a component A is obtained; Preparing an isocyanate curing agent: At least one of WANNATE PM-200, WANNATE IPDI and WANNATE MDI-50 is put into a second container, and dispersed at a stirring speed of 400-600rpm for 5-10 min to obtain a component B; preparing mortar filler: according to parts by weight, 60-80 parts of river sand with 40-70 meshes or 70-140 meshes, 16-25 parts of white cement and 8-14 parts of alkaline earth metal hydroxide are put into dry mixing equipment, and stirred at a stirring speed of 400-600rpm for 10-15 min to obtain a component C; preparing aqueous dispersion color paste: At least one of the Kedi aqueous polyurethane color paste and Yun Ze water-in-oil color paste is put into a third container, and dispersed at a stirring speed of 400-600rpm for 5-10 min to obtain a component D; Mixing A, B, C, D components: Mixing and stirring the component A, the component B and the component D uniformly to obtain mixed slurry; Then adding the component C into the mixed slurry, stirring and mixing uniformly, and curing to prepare the polyurethane mortar terrace; The mass ratio of A, B, C, D components is 1 (0.9-1.3) (1.5-6.2) (0-0.1).
  8. 8. The use of the aqueous polyurethane mortar floor emulsion according to claim 7, wherein the stirring time is 20-30 s when the temperature is 20-35 ℃ and 30-50 s when the temperature is 10-20 ℃ when the component A, the component B and the component D are mixed.
  9. 9. The use of the aqueous polyurethane mortar floor emulsion according to claim 7, wherein the C component is added to the mixed slurry for a stirring time of 1-1.5 min at a temperature >30 ℃, for a stirring time of 1.5-2 min at a temperature of 15-30 ℃, for a stirring time of 2-3 min at a temperature of 10-15 ℃, and for a stirring time of 3-5 min at a temperature <10 ℃.
  10. 10. The application of the aqueous polyurethane mortar floor emulsion according to claim 7, wherein the A, B, C, D components are uniformly mixed at 23 ℃ and have a viscosity of 20-1000 mPa.s.

Description

Water-based polyurethane mortar floor emulsion and application thereof Technical Field The invention relates to the technical field of floor coatings, in particular to an aqueous polyurethane mortar floor emulsion and application thereof. Background The water-based polyurethane mortar terrace system has been widely applied to the field of industrial terraces due to the environmental protection property and excellent physical properties. However, the technology still faces two key technical bottlenecks in practical application, namely insufficient emulsion storage stability and poor scratch resistance of the floor surface. In terms of scratch resistance, in the prior art, a linear structural polyol (such as polyether polyol N210, N220 or polyester polyol Sovermol series) is mostly adopted as a soft segment main body in the aqueous polyurethane emulsion. The three-dimensional cross-linked network formed by the molecular structure in the curing process has limited density, so that the surface hardness (the hardness of a swinging rod is generally less than or equal to 120 seconds) and the scratch resistance of the terrace material are difficult to meet the application scenes (such as logistics warehouse, heavy workshops and the like) with high mechanical strength requirements. In terms of emulsion stability, in the prior art, the molecular conformation of conventional linear polyols is difficult to form stable colloidal interfacial films during emulsification. Particularly, under the special conditions of high solid content and high filler addition of a polyurethane mortar system, the emulsion particles are more prone to Ostwald ripening and gravity sedimentation, the storage period is generally less than 1 week, and the freeze thawing stability is insufficient (demulsification occurs after 3 cycles). However, there is a substantial technical contradiction between the scratch resistance of the floor surface and the emulsion stability, and higher crosslinking density and rigid segments are required for improving the scratch resistance, which generally requires the use of polyols with high hydroxyl number, aromatic or rigid ring structures, and such structures tend to impair the storage stability and low-temperature film forming property of the emulsion. Therefore, developing a novel polyol structure and a matched formula system capable of breaking through the limitation of emulsion stability and floor scratch resistance simultaneously becomes a technical problem to be solved in the field. Disclosure of Invention Based on the technical scheme, the invention aims to provide a technical scheme for realizing the cooperative optimization of the stability of the aqueous polyurethane emulsion and the skid resistance of the surface of the mortar terrace through the molecular structure innovation of the polyol, so that the core defect that the emulsion storage stability and the final wet skid resistance of the surface of the terrace cannot be simultaneously improved in the prior art is fundamentally overcome. First aspect: the water-based polyurethane mortar floor emulsion comprises the following components: The mass ratio of the 9 groups of raw materials is (15-50): (0-20): (1.5-3): (0.1-0.6): (0-0.8): (3-12): (15-25): (5-15): (25-35); The first polyester polyol is prepared by the following method: mixing and reacting a first small molecular polyol with a monoacid to obtain a polyester polyol intermediate; Adding a crude dimer acid mixture into the polyester polyol intermediate, and mixing and reacting to obtain the first polyester polyol; the mono-acid comprises at least one of n-octanoic acid, iso-octanoic acid, lauric acid, palmitoleic acid, linoleic acid, stearic acid and oleic acid; the first small molecular polyol comprises at least one of trimethylolpropane, trimethylolethane, pentaerythritol and dipentaerythritol; The crude dimer acid mixture comprises the single acid, the dimer acid and the trimer acid, wherein the single acid accounts for less than or equal to 30 wt%, the dimer acid accounts for more than or equal to 55 wt%, and the trimer acid accounts for less than or equal to 20 wt%. Wherein, the content of monoacids (less than or equal to 30%), dimer acids (more than or equal to 55%) and trimer acids (less than or equal to 20%) is limited in order to precisely control the molecular structure and functionality of the polyester polyol. Too high a single acid can terminate the reaction, resulting in insufficient molecular weight of the polyol, low crosslinking density, severe damage to the surface hardness and wear resistance of the final floor, while too high a trimer acid can easily cause excessive branching and even gelation, resulting in runaway synthesis process and possibly damaging the storage stability of the emulsion. The dimer acid is used as a core soft chain segment, and the sufficient content of the dimer acid is the basis for ensuring that the material has good mechanical strength and process ap