Anti-crack polyurethane paint coating and process thereof

Abstract

The invention discloses an anti-crack polyurethane paint coating which comprises a polyurethane paint self-leveling layer and a surface anti-crack anti-skid net, the surface anti-crack anti-skid net is embedded in the surface of the polyurethane paint self-leveling layer, and the surface anti-crack anti-skid net forms stripe-shaped anti-skid protrusions on the surface of the polyurethane paint self-leveling layer; the surface crack resistance of the self-leveling coating is improved.

Description

Technical Field

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

[0002] Thickly applying (more than 5mm thick) self-leveling polyurethane paint on the cement floor can make the floor elastic, effectively cushion the impact of athletes' soles, and improve the foot feel; if the thick self-leveling paint is impacted by pedestrians' soles for a long time after curing, its surface is prone to cracks under the impact stress, and the size of the cracks will expand with the continuous impact, causing damage to the thickly applied self-leveling paint; at the same time, the surface of the self-leveling paint is smooth and flat after curing, and its flat paint surface structure does not have an anti-slip function. It is very easy to slip and fall on the smooth self-leveling paint surface, especially when the ground is wet. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a crack-resistant polyurethane paint coating and a process thereof to improve the surface crack resistance of self-leveling paint.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides an anti-cracking polyurethane paint coating, comprising a polyurethane paint self-leveling layer and a surface anti-cracking and anti-skid net, wherein the surface anti-cracking and anti-skid net is embedded in the surface of the polyurethane paint self-leveling layer, and the surface anti-cracking and anti-skid net forms striped anti-skid protrusions on the surface of the polyurethane paint self-leveling layer.

[0005] Furthermore, the surface anti-cracking and anti-skid net is a horizontal mesh structure formed by a plurality of hollow metal thin tubes extending in the X direction and a plurality of structural metal wires extending in the Y direction which are crisscrossed and fixedly connected.

[0006] Furthermore, both ends of each hollow metal thin tube are integrally provided with an upwardly bent elbow, the end of the elbow is an upward epoxy resin injection port, and each of the hollow metal thin tubes is filled with epoxy resin.

[0007] Furthermore, the thickness of each hollow metal tube is in the range of 2.5 mm to 3.5 mm, the thickness of the self-leveling layer of the polyurethane coating is not less than 5 mm, and the outer diameter of the structural metal wire is not greater than 1.5 mm.

[0008] Furthermore, at least one quarter of the hollow metal tube protrudes from the surface of the polyurethane coating self-leveling layer to form a textured anti-skid protrusion, and each structural metal wire is completely immersed in the surface of the polyurethane coating self-leveling layer.

[0009] Furthermore, when the hollow metal tubes on the horizontal anti-cracking and anti-skid net are not filled with epoxy resin and are all hollow, the horizontal anti-cracking and anti-skid net automatically floats in the uncured liquid polyurethane paint self-leveling layer under the action of buoyancy, so that at least one quarter of the hollow metal tubes protrude from the surface of the liquid polyurethane paint self-leveling layer, and each structural metal wire is completely immersed in the surface of the liquid polyurethane paint self-leveling layer.

[0010] Furthermore, the self-leveling coating emulsion constituting the liquid polyurethane coating self-leveling layer includes, by weight, 50-70 parts of polyurethane resin, 14-16 parts of dimethylaminoethyl acrylate, 22-42 parts of water, 35-58 parts of filler, 15-17 parts of curing agent, 2 parts of leveling agent, 2-8 parts of dispersant, 0.6-0.8 parts of defoaming agent, and 2-5 parts of diluent.

[0011] Further, a construction process of a crack-resistant polyurethane coating:

[0012] Step 1: lay the surface anti-cracking and anti-skid net horizontally on the ground where the self-leveling paint emulsion has not been poured, and make each hollow metal tube on the anti-cracking and anti-skid net extend in the X direction, and each structural metal wire extend in the Y direction; wherein the Y direction is the walking direction of the road surface; at this time, each hollow metal tube is not filled with epoxy resin and is in a hollow state, and at this time, the epoxy resin injection port at the end of each hollow metal tube faces upward and is distributed at the edge of the ground;

[0013] Step 2: pour the self-leveling paint emulsion on the ground in the area where the anti-cracking and anti-skid net is laid to form a liquid polyurethane paint self-leveling layer, and the thickness of the liquid polyurethane paint self-leveling layer is not less than 5 mm; since the hollow metal tubes on the anti-cracking and anti-skid net are all hollow at this time, the horizontal anti-cracking and anti-skid net automatically floats in the uncured liquid polyurethane paint self-leveling layer under the action of buoyancy, so that at least one quarter of the hollow metal tube protrudes from the surface of the liquid polyurethane paint self-leveling layer, and each structural metal wire is completely immersed in the surface of the liquid polyurethane paint self-leveling layer;

[0014] Step three, after standing still for a predetermined time, the liquid polyurethane coating self-leveling layer is cured, and then epoxy resin mixed with curing agent is injected into the epoxy resin injection port of the elbow at one end of each hollow metal tube one by one. After standing still for a certain period of time, each hollow metal tube is filled with the cured epoxy resin.

[0015] Beneficial effects: the cured polyurethane coating self-leveling layer of the cement floor of the present invention makes the floor elastic, effectively reduces the impact force on the soles of athletes and improves the foot feel. At the same time, the grid structure of the anti-cracking and anti-skid net attached to the surface of the self-leveling polyurethane coating can effectively disperse the local impact or extrusion stress from the outside when the surface of the self-leveling coating is subjected to external impact, especially when pedestrians are running, the impact force of the soles on the self-leveling coating is helpful to reduce the cracks of the thick self-leveling coating caused by local stress concentration such as external impact. At the same time, the surface anti-cracking and anti-skid net of this scheme forms striped anti-skid protrusions on the surface of the polyurethane coating self-leveling layer, which plays a physical anti-skid role. Not only that, each hollow metal tube is filled with epoxy resin, and each hollow metal tube is filled with cured epoxy resin, thereby significantly improving the compression and deformation resistance of the hollow tube, and improving the stability of the anti-skid structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the anti-crack and anti-skid net from a bird's-eye view;

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the anti-crack and anti-skid net;

[0019] Figure 4 This is a schematic diagram of the top view of the coating surface of this scheme. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] As attached Figures 1 to 4 The anti-cracking polyurethane paint coating shown includes a polyurethane paint self-leveling layer and a surface anti-cracking and anti-skid net 4. The surface anti-cracking and anti-skid net 4 is embedded in the surface of the polyurethane paint self-leveling layer. It should be noted that the anti-cracking and anti-skid net 4 in this case is different from the traditional "meshing" process of wall paint. The mesh of the traditional "meshing" process is distributed at the junction of the paint and the wall (distributed at the bottom layer of the coating, not the coating surface in this case). The traditional meshing treatment can effectively prevent cracks in the wall itself, which is not an external factor. The traditional "meshing" process fights against cracks on the paint surface caused by cracks in the wall itself, and has little effect on cracks caused by external impacts and local pressure.

[0022] The grid structure horizontally distributed on the coating surface of the present invention can effectively disperse the local impact or extrusion stress when the self-leveling coating surface is subjected to external impact, especially the impact force of the soles of pedestrians on the self-leveling coating when running, thereby helping to reduce the cracks of the thick self-leveling coating caused by local stress concentration such as external impact. At the same time, the surface anti-cracking and anti-skid net 4 of the present invention forms striped anti-skid protrusions 2a on the surface of the polyurethane coating self-leveling layer, such as Figure 4 As shown, it plays a physical anti-slip role.

[0023] The surface anti-crack and anti-skid net 4 is a horizontal mesh structure formed by a plurality of hollow metal thin tubes 2 extending in the X direction and a plurality of structural metal wires 3 extending in the Y direction, which are crisscrossed and fixedly connected. The main material can be 304 stainless steel. The reason for selecting the hollow metal thin tube 2 is that the hollow structure inside it reduces the density, which is convenient for "floating" during the construction process. The process part is described later. However, although the hollow metal thin tube 2 has a strong tensile strength, due to the hollow thin-walled structure and because the upper part of the hollow metal thin tube 2 itself needs to be exposed to the surface of the paint, the hollow metal thin tube 2 is not easy to be damaged. The surface plays an anti-slip role. When impacted, the hollow metal thin tube 2 is prone to deformation and surface deformation such as pits due to impact due to its weak anti-deformation ability. Therefore, the following structure is designed on this basis: both ends of each hollow metal thin tube 2 are integrally provided with an upwardly bent elbow 5, and the end of the elbow 5 is an upward epoxy resin injection port 5, and each hollow metal thin tube 2 is filled with epoxy resin. After each hollow metal thin tube 2 is filled with cured epoxy resin, the compression resistance and anti-deformation ability of the hollow tube are significantly improved.

[0024] The diameter of each hollow metal tube 2 in this case is 2.5mm-3.5mm, the thickness of the self-leveling layer of the polyurethane paint is not less than 5mm, and the outer diameter of the structural metal wire 3 is not greater than 1.5mm; at least one quarter of the hollow metal tube 2 protrudes from the surface of the self-leveling layer of the polyurethane paint to form a textured anti-slip protrusion 2a, and each structural metal wire 3 is completely immersed in the surface of the self-leveling layer of the polyurethane paint.

[0025] When the hollow metal tubes 2 on the horizontal anti-cracking and anti-skid net 4 are not filled with epoxy resin and are all hollow, the horizontal anti-cracking and anti-skid net 4 automatically floats in the uncured liquid polyurethane paint self-leveling layer under the action of buoyancy, so that at least one quarter of the hollow metal tubes 2 protrude from the surface of the liquid polyurethane paint self-leveling layer, and each structural metal wire 3 is completely immersed in the surface of the liquid polyurethane paint self-leveling layer.

[0026] The self-leveling coating emulsion constituting the liquid polyurethane coating self-leveling layer includes, by weight, 50-70 parts of polyurethane resin, 14-16 parts of dimethylaminoethyl acrylate, 22-42 parts of water, 35-58 parts of filler, 15-17 parts of curing agent, 2 parts of leveling agent, 2-8 parts of dispersant, 0.6-0.8 parts of defoaming agent and 2-5 parts of diluent.

[0027] Construction process of anti-cracking polyurethane coating:

[0028] S1, horizontally lay the surface anti-cracking and anti-skid net 4 on the cement floor that has not been poured with the self-leveling paint emulsion, and make each hollow metal tube 2 on the anti-cracking and anti-skid net 4 extend in the X direction, and each structural metal wire 3 extends in the Y direction; wherein the Y direction is the walking direction of the road surface; at this time, each hollow metal tube 2 is not filled with epoxy resin and is in a hollow state, and at this time, the epoxy resin injection port 5 at the end of each hollow metal tube 2 faces upward and is distributed at the edge of the ground;

[0029] S2, pouring the self-leveling paint emulsion on the ground in the area where the anti-cracking and anti-skid net 4 is laid to form a liquid polyurethane paint self-leveling layer, and the thickness of the liquid polyurethane paint self-leveling layer is not less than 5mm; since the hollow metal tubes 2 on the anti-cracking and anti-skid net 4 are all hollow at this time, the horizontal anti-cracking and anti-skid net 4 automatically floats in the uncured liquid polyurethane paint self-leveling layer under the action of buoyancy, so that at least one quarter of the hollow metal tubes 2 protrude from the surface of the liquid polyurethane paint self-leveling layer, and each structural metal wire 3 is completely immersed in the surface of the liquid polyurethane paint self-leveling layer;

[0030] S3, after standing still for a predetermined time, the liquid polyurethane coating self-leveling layer is cured, and then epoxy resin mixed with curing agent is injected into the epoxy resin injection port 5 of the elbow 5 at one end of each hollow metal thin tube 2 one by one. After standing still for a certain period of time, each hollow metal thin tube 2 is filled with the cured epoxy resin, thereby significantly improving the compression and deformation resistance of the hollow tube.

[0031] The cured polyurethane coating self-leveling layer finally formed on the cement floor makes the floor elastic, effectively reduces the impact force on the soles of athletes and improves the foot feel. At the same time, the grid structure of the anti-cracking and anti-skid net 4 attached to the surface of the self-leveling polyurethane coating can effectively disperse the local impact or extrusion stress from the outside when the surface of the self-leveling coating is subjected to external impact, especially when pedestrians are running, the impact force of the soles on the self-leveling coating is helpful to reduce the cracks of the thick self-leveling coating caused by local stress concentration such as external impact. At the same time, the surface anti-cracking and anti-skid net 4 of this scheme forms striped anti-skid protrusions 2a on the surface of the polyurethane coating self-leveling layer, which plays a physical anti-skid role. Not only that, each hollow metal tube 2 is filled with epoxy resin. After each hollow metal tube 2 is filled with cured epoxy resin, the compression and deformation resistance of the hollow tube are significantly improved, and the stability of the anti-skid structure is improved.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A crack-resistant polyurethane coating, characterized in that: The invention comprises a polyurethane coating self-leveling layer and a surface anti-cracking and anti-skid net (4), wherein the surface anti-cracking and anti-skid net (4) is embedded in the surface of the polyurethane coating self-leveling layer, and the surface anti-cracking and anti-skid net (4) forms stripe-shaped anti-skid protrusions (2a) on the surface of the polyurethane coating self-leveling layer.

2. The anti-cracking polyurethane coating according to claim 1, characterized in that: The surface anti-cracking and anti-skid net (4) is a horizontal net structure formed by a plurality of hollow metal thin tubes (2) extending in the X direction and a plurality of structural metal wires (3) extending in the Y direction, which are crisscrossed and fixedly connected.

3. The anti-cracking polyurethane coating according to claim 3, characterized in that: Both ends of each hollow metal thin tube (2) are integrally provided with an upwardly bent elbow (5), the end of the elbow (5) is an upwardly facing epoxy resin injection port (5), and each hollow metal thin tube (2) is filled with epoxy resin.

4. The anti-cracking polyurethane coating according to claim 3, characterized in that: The thickness of each hollow metal thin tube (2) is in the range of 2.5mm-3.5mm, the thickness of the polyurethane coating self-leveling layer is not less than 5mm, and the outer diameter of the structural metal wire (3) is not greater than 1.5mm.

5. The anti-cracking polyurethane coating according to claim 4, characterized in that: At least one quarter of the hollow metal tube (2) protrudes from the surface of the polyurethane coating self-leveling layer to form a patterned anti-skid protrusion (2a), and each structural metal wire (3) is completely immersed in the surface of the polyurethane coating self-leveling layer.

6. The anti-cracking polyurethane coating according to claim 5, characterized in that: When the hollow metal tubes (2) on the horizontal anti-cracking and anti-skid net (4) are not filled with epoxy resin and are all hollow, the horizontal anti-cracking and anti-skid net (4) automatically floats in the uncured liquid polyurethane coating self-leveling layer under the action of buoyancy, so that at least one quarter of the hollow metal tubes (2) protrude from the surface of the liquid polyurethane coating self-leveling layer, and each structural metal wire (3) is completely immersed in the surface of the liquid polyurethane coating self-leveling layer.

7. The anti-cracking polyurethane coating according to claim 1, characterized in that: The self-leveling coating emulsion constituting the liquid polyurethane coating self-leveling layer includes, by weight, 50-70 parts of polyurethane resin, 14-16 parts of dimethylaminoethyl acrylate, 22-42 parts of water, 35-58 parts of filler, 15-17 parts of curing agent, 2 parts of leveling agent, 2-8 parts of dispersant, 0.6-0.8 parts of defoaming agent and 2-5 parts of diluent.

8. The construction process of a crack-resistant polyurethane coating according to claim 6, characterized in that: Step 1: horizontally lay the surface anti-cracking and anti-skid net (4) on the ground where the self-leveling paint emulsion has not been poured, and make each hollow metal thin tube (2) on the anti-cracking and anti-skid net (4) extend in the X direction, and each structural metal wire (3) extend in the Y direction; wherein the Y direction is the walking direction of the road surface; at this time, each hollow metal thin tube (2) is not filled with epoxy resin and is in a hollow state, and at this time, the epoxy resin injection port (5) at the end of each hollow metal thin tube (2) faces upward and is distributed at the edge of the ground; Step 2: pour the self-leveling paint emulsion on the ground in the area where the anti-cracking and anti-skid net (4) is laid to form a liquid polyurethane paint self-leveling layer, and the thickness of the liquid polyurethane paint self-leveling layer is not less than 5 mm; since the hollow metal thin tubes (2) on the anti-cracking and anti-skid net (4) are all hollow at this time, the horizontal anti-cracking and anti-skid net (4) automatically floats in the uncured liquid polyurethane paint self-leveling layer under the action of buoyancy, so that at least one quarter of the hollow metal thin tube (2) protrudes from the surface of the liquid polyurethane paint self-leveling layer, and each structural metal wire (3) is completely immersed in the surface of the liquid polyurethane paint self-leveling layer; Step three, after standing still for a predetermined time, the liquid polyurethane coating self-leveling layer is cured, and then epoxy resin mixed with a curing agent is injected into the epoxy resin injection port (5) of the elbow (5) at one end of each hollow metal thin tube (2) one by one. After standing still for a certain period of time, each hollow metal thin tube (2) is filled with the cured epoxy resin.

Images