An aqueous polyurethane paint and its preparation method

Abstract

The present invention discloses a waterborne polyurethane paint, which comprises 62 - 72 parts of polyurethane resin; 14 - 18 parts of dimethylaminoethyl methacrylate; 15 - 32 parts of metal-core organic polymer-coated particles; 13 - 32 parts of deionized water; 10 - 30 parts of density control agent; 20 - 50 parts of filler; 1 - 1.5 parts of leveling agent; 0.5 - 0.7 parts of defoamer; 2 - 4 parts of diluent; 0.8 - 1.4 parts of dispersant; 16 - 22 parts of curing agent. Besides having surface anti-slip and anti-wear properties, since the metal-core organic polymer-coated particles are evenly discretely suspended in the self-leveling emulsion before curing, after the self-leveling paint is cured, a large number of metal-core organic polymer-coated particles are evenly embedded in the cured self-leveling coating in three-dimensional space, which plays a significant structural support capacity for the cured self-leveling itself, effectively improving the compressive and anti-deformation abilities of the coating.

Description

Technical Field

[0001] The present invention belongs to the field of polyurethane coatings. Background Art

[0002] In the anti-slip process during the construction stage of existing self-leveling floor paints, generally the following several types are included:

[0003] 1. Surface roughening, the surface roughening process of the paint, including substrate treatment, primer coating, roller coating of the flat film, and roughening treatment using a special roughening roller or tool before the flat film is surface dry; including a variety of construction processes, the process is cumbersome, the construction requirements are high, the paint surface forms a delicate texture effect, with a certain anti-slip ability, but the anti-slip ability decreases when there is water accumulation. The delicate raised texture on the paint surface is itself a part of the paint, and its texture has no hard core support, so the strength is weak.

[0004] 2. Sprinkling method on the paint surface. On the basis of ordinary self-leveling, when the coating is not yet dry, sand and gravel anti-slip particles are evenly sprinkled on the surface. After curing, there are particle protrusions on the surface. It is necessary to grasp the timing of sand sprinkling. If it is too early, the sand will sink too much in the paint surface, resulting in no surface protrusions being formed. If it is too late, the paint surface has already cured, and the sand cannot adhere to the paint, and a large number of anti-slip bumps are formed on the paint surface, with a strong anti-slip ability. However, because the sand has high hardness and sharp surface, it is easy to scratch the soles of the feet; at the same time, the sand on the paint surface is prone to falling off; and there is also the problem of poor uniformity in sprinkling.

[0005] 3. Sealing layer method, on the basis of the "sprinkling method on the paint surface", another sealing film is coated. The process is more complex than that of the "sprinkling method on the paint surface", adding a second coating construction process, and at the same time the cost further increases. It improves the problem that the "sprinkling method on the paint surface" is easy to scratch the soles of the feet due to the high hardness and sharp surface of the sand, but it is easy to cause the problem that the surface protrusions are covered by the second coating construction process, thereby losing the anti-slip ability.

[0006] Thus, it can be seen that the above three common processes all have certain drawbacks in terms of construction process and paint surface effect. Brief Description of the Drawings

[0007] Appendix Figure 1 Partial schematic diagram of the paint surface. Summary of the Invention

[0008] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides an aqueous polyurethane paint and its preparation method. The paint produced by the present invention has the characteristics of simple construction process and easy operation, and the convex points evenly distributed discretely on the paint surface play an anti-slip role for pedestrians.

[0009] Technical solution: To achieve the above object, a waterborne polyurethane paint of the present invention comprises 62 - 72 parts of polyurethane resin; 14 - 18 parts of dimethylaminoethyl methacrylate; 15 - 32 parts of metal-core organic polymer-coated particles; 13 - 32 parts of deionized water; 10 - 30 parts of density control agent; 20 - 50 parts of filler; 1 - 1.5 parts of leveling agent; 0.5 - 0.7 parts of defoaming agent; 2 - 4 parts of diluent; 0.8 - 1.4 parts of dispersant; 16 - 22 parts of curing agent.

[0010] Furthermore, the metal-core organic polymer-coated particles are all particles with a magnesium-aluminum alloy core coated with a layer of polymer coating.

[0011] Furthermore, the particle size range of the metal-core organic polymer-coated particles is 1.8 mm - 2.6 mm.

[0012] Furthermore, the polymer coating material of the metal-core organic polymer-coated particles is polyvinyl chloride.

[0013] Furthermore, the preparation method of the metal-core organic polymer-coated particles:

[0014] S1-1, Using a metal granulator with a high-speed rotation granulation method, the magnesium-aluminum alloy material is shaved, broken, extruded and rubbed by a high-speed rotating rotor to gradually form uniform spherical or elliptical particles; the particle size of the finally formed magnesium-aluminum alloy particles is controlled by adjusting the rotation speed of the rotor, the blade spacing and the feeding speed.

[0015] S1-2, The formed particles enter the screening system, the particles with qualified particle size are separated and discharged through the discharge port for collection and standby, and the unqualified particles will continue to stay inside the equipment for re-crushing, and finally magnesium-aluminum alloy particles with uniform particle size are obtained; the particle size range of the magnesium-aluminum alloy particles finally discharged from the discharge port is 1.7 mm - 1.9 mm.

[0016] S1-3, Using a fluidized bed coater to uniformly coat the molten polyvinyl chloride on the outer surface of the magnesium-aluminum alloy particles obtained in S1-2 to obtain metal-core organic polymer-coated particles.

[0017] S1-4, Select the metal-core organic polymer-coated particles with qualified density.

[0018] Further, the operation process of S1-4: Prepare solution a with a density of Pa and solution b with a density of Pb, where Pa > Pb; put the metal core organic polymer coated particles obtained in S1-3 into solution a, stir and then let it stand, and then put all the floating metal core organic polymer coated particles in solution a into solution b, stir and then let it stand. All the metal core organic polymer coated particles sinking into solution b are metal core organic polymer coated particles with qualified density, and the density range of the metal core organic polymer coated particles with qualified density is Pb to Pa.

[0019] Further, in the coating process of the fluidized bed coater in S1-3, let the supplied mass of polyvinyl chloride be ma, the supplied mass of magnesium-aluminum alloy particles be mb, the density of the cooled and solidified polyvinyl chloride be P1, and the density of the magnesium-aluminum alloy particles be P2; the following quantitative relationship needs to be followed: Let Pc = (Pb + Pa) / 2, Pc = (ma + mb) / (ma / P1 + mb / P2), Pb = (Pc - 0.02Pc), Pa = (Pc + 0.02Pc).

[0020] Further, in S2-1, mix the weighed polyurethane resin, deionized water, dimethylaminoethyl methacrylate, diluent and dispersant, and stir at 850 r / min to 1100 r / min for 60 min to 90 min;

[0021] In S2-2, add the weighed curing agent, leveling agent, defoaming agent and filler to the mixture obtained in S2-1, and stir at 1000 r / min to 1200 r / min for 60 min to 90 min;

[0022] In S2-3, set the emulsion density Px, and measure the emulsion density Px obtained at the end of S2-2 with a densitometer. In the initial state, Px < Pc, and then gradually add the density control agent to the emulsion obtained in S2-2 in gradients and stir at 800 r / min to 900 r / min in stages to gradually increase the density of the emulsion Px until Px = Pc;

[0023] In S2-4, weigh the metal core organic polymer coated particles obtained at the end of S1-4 and add them to the emulsion obtained at the end of S2-3, and stir at 800 r / min to 900 r / min for 15 min to 30 min to make the metal core organic polymer coated particles evenly suspended in the emulsion obtained at the end of S2-3; thus, a polyurethane self-leveling anti-slip waterborne coating with discrete suspended particles is prepared.

[0024] Beneficial effects: The paint produced by the present invention has the characteristics of simple construction process and easy operation. The convex points evenly distributed on the paint surface play an anti-slip role for pedestrians. Since each metal-core organic polymer-coated particle is an aluminum-magnesium core particle coated with a layer of polyvinyl chloride shell, the polyvinyl chloride shell not only plays an anti-slip role, but also has a softer texture than stone or sand grains and harder than ordinary resin particles. Its convex points have a round shape, so it will not scratch the soles of pedestrians. At the same time, the polyvinyl chloride shell plays a role in strengthening the anti-corrosion of the wrapped aluminum-magnesium alloy. The polyvinyl chloride shell outside the metal-core organic polymer-coated particle has a strong affinity with polyurethane and is not easy to fall off. The magnesium-aluminum alloy core of the metal-core organic polymer-coated particle effectively guarantees the pressure resistance and wear resistance of the paint surface convex points. At the same time, in addition to having surface anti-slip and anti-wear properties, since the metal-core organic polymer-coated particles are evenly dispersed and suspended in the self-leveling emulsion before curing, after the self-leveling paint cures, a large number of metal-core organic polymer-coated particles are evenly embedded in the cured self-leveling paint in three-dimensional space, which plays a significant structural support capacity for the cured self-leveling itself, effectively improving the compressive and anti-deformation abilities of the paint. Detailed implementation manners

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] A waterborne polyurethane paint, comprising 62 - 72 parts of polyurethane resin; 14 - 18 parts of dimethylaminoethyl methacrylate; 15 - 32 parts of metal-core organic polymer-coated particles; 13 - 32 parts of deionized water; 10 - 30 parts of density control agent; 20 - 50 parts of filler; 1 - 1.5 parts of leveling agent; 0.5 - 0.7 parts of defoaming agent; 2 - 4 parts of diluent; 0.8 - 1.4 parts of dispersant; 16 - 22 parts of curing agent.

[0027] In the embodiment, the density control agent described above is barite powder (BaSO4); the filler is one or more of wollastonite, titanium dioxide, alumina, and polytetrafluoroethylene wax; the leveling agent is polyether-polyester modified silicone; the defoaming agent is a polyether defoaming agent; the diluent is phenyl glycidyl ether; the curing agent is toluene diisocyanate; the dispersant is polycarboxylate.

[0028] The metal-core organic polymer-coated particles are all particles with a magnesium-aluminum alloy core coated with a layer of polymer coating; the particle size range of the metal-core organic polymer-coated particles is 1.8 mm - 2.6 mm; the polymer coating material of the metal-core organic polymer-coated particles is polyvinyl chloride.

[0029] Preparation method of the metal-core organic polymer-coated particles:

[0030] S1-1. A metal granulator using the high-speed rotation granulation method. The magnesium-aluminum alloy material is shaved, broken, extruded and rubbed by a high-speed rotating rotor to gradually form uniform spherical or elliptical particles. The particle size of the finally formed magnesium-aluminum alloy particles is controlled by adjusting the rotation speed of the rotor, the blade spacing and the feeding speed.

[0031] S1-2. The formed particles enter the screening system, and the particles with qualified particle size are separated and discharged through the discharge port for collection and standby. The unqualified particles will remain inside the equipment for re-crushing until magnesium-aluminum alloy particles with uniform particle size are obtained. The particle size range of the magnesium-aluminum alloy particles finally discharged from the discharge port is 1.7 mm to 1.9 mm.

[0032] S1-3. A fluidized bed coater is used to uniformly coat the molten polyvinyl chloride on the outer surface of the magnesium-aluminum alloy particles obtained in S1-2 to obtain metal core organic polymer coated particles.

[0033] S1-4. Qualified density metal core organic polymer coated particles are separated by density separation method.

[0034] Pc = 1.65 g / cm is preset in advance 3 , where Pc is the target density (under ideal conditions) of the metal core organic polymer coated particles; in the coating process of the fluidized bed coater in S1-3, let the supplied mass of polyvinyl chloride be ma, the supplied mass of magnesium-aluminum alloy particles be mb, the density of polyvinyl chloride be P1, and the density of polyvinyl chloride in this case is 1.4 g / cm 3 , the density of magnesium-aluminum alloy particles is P2, and the density of magnesium-aluminum alloy is usually between 1.3 and 1.9 g / cm 3 . In this case, a relatively high-density magnesium-aluminum alloy is used, and the specific density of the aluminum alloy particles is 1.75 g / cm 3 ; it is necessary to follow Pc = (ma + mb) / (ma / P1 + mb / P2), so that under ideal conditions, the density of all metal core organic polymer coated particles obtained by the coating process of the fluidized bed coater is just Pc. Due to certain process errors in the coating process of the fluidized bed coater, the density of the actually prepared metal core organic polymer coated particles varies, and fluctuates up and down based on Pc. Let the density range of the qualified density metal core organic polymer coated particles be Pb to Pa; let Pc = (Pb + Pa) / 2, Pb = (Pc - 0.02Pc), Pa = (Pc + 0.02Pc); according to the set value of Pc, the values of Pa and Pb are obtained by combining the above quantitative relationship.

[0035] The operation process of the density separation method in S1-4 is as follows: Prepare and formulate solution a with a density of Pa and solution b with a density of Pb; Put the metal core organic polymer coated particles obtained in S1-3 into solution a, stir and then let it stand, and then put all the floating metal core organic polymer coated particles in solution a into solution b, stir and let it stand. All the metal core organic polymer coated particles sinking into solution b are metal core organic polymer coated particles with qualified density. The density range of the metal core organic polymer coated particles with qualified density is Pb~Pa. From the above mathematical relationship, it can be seen that all the metal core organic polymer coated particles with qualified density obtained after S1-4 are around Pc = 1.65 g / cm 3 and the floating range is no more than 2% of the Pc value, providing a basis for the subsequent suspension effect.

[0036] S2-1: Mix the weighed polyurethane resin, deionized water, dimethylaminoethyl methacrylate, diluent and dispersant, and stir at 850 r / min~1100 r / min for 60 min~90 min.

[0037] S2-2: Add the weighed curing agent, leveling agent, defoaming agent and filler to the mixture obtained in S2-1, and stir at 1000 r / min~1200 r / min for 60 min~90 min.

[0038] S2-3: Set the emulsion density Px, and measure the emulsion density Px obtained at the end of S2-2 with a densitometer. The actually measured value of Px in the initial state is 1.45 g / cm 3 , Px<Pc. Then gradually add the density control agent (barite powder) to the emulsion obtained in S2-2 in gradients and stir at 800 r / min~900 r / min in stages to gradually increase the density of the emulsion Px until Px = Pc = 1.65 g / cm 3 .

[0039] S2-4: Weigh the metal core organic polymer coated particles obtained at the end of S1-4 and add them to the emulsion with a density of exactly Pc = 1.65 g / cm 3 obtained at the end of S2-3, and stir at 800 r / min~900 r / min for 15 min~30 min. Since all the metal core organic polymer coated particles with qualified density obtained after S1-4 are around Pc = 1.65 g / cm 3 and the floating range is no more than 2% of the Pc value, and because the emulsion obtained at the end of S2-3 itself has a certain viscosity, the metal core organic polymer coated particles will be evenly suspended in the emulsion obtained at the end of S2-3; thus, a polyurethane self-leveling anti-slip water-based paint with discrete suspended particles is prepared and finally filled.

[0040] One embodiment of the above polyurethane self-leveling anti-slip waterborne coating is as follows by weight parts:

[0041] Component Parts by weight Polyurethane resin 66 Dimethylaminoethyl methacrylate 16 Metal core organic polymer coated particles 20 Deionized water 22 Density control agent (barite powder) 16 Leveling agent (polyether polyester modified silicone) 1 Defoaming agent (polyether defoaming agent) 0.6 Diluent (phenyl glycidyl ether) 3 Dispersant (sodium polycarboxylate) 1 Curing agent (toluene diisocyanate) 18 Filler 1 (wollastonite) 10 Filler 2 (aluminum oxide) 12 Filler 3 (polytetrafluoroethylene wax) 12

[0042] Usage method and technical effects of the polyurethane self-leveling anti-slip waterborne coating:

[0043] Before self-leveling, appropriately shake or stir the canned polyurethane self-leveling anti-slip waterborne paint with discrete suspended particles, and then self-level it on the ground to form a paint surface. During the curing process, due to reasons such as water evaporation, the paint surface will automatically shrink inwards adaptively during the curing process, so that some of the metal core organic polymer coated particles that are discrete and evenly distributed in the paint will be discretely and evenly distributed on the surface of the self-leveling paint in the form of bumps, as Figure 1 shown; the discrete and evenly distributed bumps on the cured paint surface play an anti-slip role for pedestrians, especially effectively preventing pedestrians from falling when there is water accumulation on the paint surface; since each metal core organic polymer coated particle is an aluminum-magnesium core particle coated with a layer of polyvinyl chloride shell, the polyvinyl chloride shell not only plays an anti-slip role, but also the texture of the polyvinyl chloride shell is softer than that of stone or sand grains and harder than ordinary resin particles, and its bumps have a round shape, so as not to scratch the soles of pedestrians; at the same time, the polyvinyl chloride shell plays a role in strengthening the corrosion protection of the wrapped aluminum-magnesium alloy, and at the same time, the polyvinyl chloride shell outside the metal core organic polymer coated particle has a strong affinity with polyurethane and is not easy to fall off; and the magnesium-aluminum alloy core of the metal core organic polymer coated particle effectively ensures the pressure resistance and wear resistance of the paint surface bumps; at the same time, in addition to having surface anti-slip and anti-wear properties, since the metal core organic polymer coated particles are evenly discretely suspended in the self-leveling emulsion before curing, after this self-leveling paint cures, a large number of metal core organic polymer coated particles are evenly embedded in the cured self-leveling paint in three-dimensional space, which plays a significant structural support ability for the cured self-leveling itself, effectively improving the compressive and anti-deformation abilities of the paint.

[0044] The comparison of the anti-slip process with the existing self-leveling floor paint is as follows in the table:

[0045]

[0046]

[0047]

[0048] As can be seen from the above table, this solution has significant advantages over the existing anti-slip construction process both in terms of the difficulty of construction and the final paint surface effect.

[0049] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a water-based polyurethane paint, comprising 62-72 parts of polyurethane resin; 14-18 parts of dimethylaminoethyl methacrylate; 15-32 parts of metal core organic polymer coated particles; 13-32 parts of deionized water; 10-30 parts of density control agent; 20-50 parts of filler; 1-1.5 parts of leveling agent; 0.5-0.7 parts of defoaming agent; 2-4 parts of diluent; 0.8-1.4 parts of dispersant; 16-22 parts of curing agent; Features: S1-1, a metal granulator using a high-speed rotary granulation method, which uses a high-speed rotating rotor to cut, crush, squeeze and rub the magnesium-aluminum alloy material to gradually form uniform spherical or elliptical particles; the particle size of the final magnesium-aluminum alloy particles is controlled by adjusting the rotor speed, blade spacing and feed speed; S1-2, the formed particles are sent into the screening system, the particles with qualified particle size are separated, and discharged through the discharge port, collected for standby use, and the unqualified particles will continue to remain in the equipment for re-crushing, and finally the magnesium-aluminum alloy particles with uniform particle size are obtained; the particle size range of the magnesium-aluminum alloy particles finally discharged from the discharge port is 1.7mm to 1.9mm; S1-3, using a fluidized bed coating machine to uniformly coat the molten polyvinyl chloride on the outer surface of the magnesium-aluminum alloy particles obtained in S1-2 to obtain metal core organic polymer coated particles; S1-4, selecting metal core organic polymer coated particles with qualified density; The operation process of S1-4 is as follows: prepare a solution with a density of Pa and a solution with a density of Pb, wherein Pa>Pb; put the metal core organic polymer coated particles obtained in S1-3 into the a solution, stir and let stand, then put all the metal core organic polymer coated particles floating in the a solution into the b solution, stir and let stand, and all the metal core organic polymer coated particles sunk into the b solution are metal core organic polymer coated particles with qualified density, and the density range of the metal core organic polymer coated particles with qualified density is Pb~Pa; In the coating process of the fluidized bed coating machine in S1-3, the supply mass of polyvinyl chloride is assumed to be ma, the supply mass of magnesium-aluminum alloy particles is assumed to be mb, the density of polyvinyl chloride after cooling and solidification is assumed to be P1, and the density of magnesium-aluminum alloy particles is assumed to be P2; the following quantitative relationship must be followed: Pc=(Pb+Pa) / 2, Pc= (ma+ mb) / (ma / P1+mb / P2), Pb=(Pc-0.02Pc), Pa=(Pc+ 0.02Pc); S2-1, mixing the weighed polyurethane resin, deionized water, dimethylaminoethyl methacrylate, diluent and dispersant, and stirring at 850 r / min to 1100 r / min for 60 min to 90 min; S2-2, adding the weighed curing agent, leveling agent, defoaming agent and filler to the mixture obtained in S2-1, stirring at 1000 r / min to 1200 r / min for 60 min to 90 min; S2-3, assume that the density of the emulsion is Px, and measure the density of the emulsion Px obtained at the end of S2-2 by a density meter. In the initial state, Px < Pc, and then gradually add a density control agent to the emulsion obtained in S2-2 according to a gradient, and stir at 800r / min to 900r / min in stages to gradually increase the density of the emulsion Px until Px = Pc; S2-4, weigh the metal core organic polymer coated particles obtained at the end of S1-4, add them to the emulsion at the end of S2-3, and stir at 800r / min~900r / min for 15min~30min to make the metal core organic polymer coated particles evenly suspended in the emulsion at the end of S2-3; thereby preparing a polyurethane self-leveling anti-skid water coating with discrete suspended particles.

2. The method for preparing a waterborne polyurethane paint according to claim 1, characterized in that: The metal core organic polymer coated particles are particles with a magnesium-aluminum alloy core coated with a layer of polymer coating.

3. The method for preparing a waterborne polyurethane paint according to claim 2, characterized in that: The particle size range of the metal core organic polymer coated particles is 1.8 mm to 2.6 mm.

4. The method for preparing a waterborne polyurethane paint according to claim 3, characterized in that: The polymer coating material of the metal core organic polymer coated particles is polyvinyl chloride.

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