Anti-cracking mixed coating process for PUR solid wood composite floor

Abstract

The application discloses a kind of anti-cracking mixed coating processes of PUR solid wood composite floor, comprising the following steps: first, the surface of solid wood composite board is coated with water-based colorant, then the surface of solid wood composite board is dried by infrared, then the PUR glue and UV paint in high temperature state are quantitatively mixed to carry out first stirring, form mixed paint, then after stirring is completed, mixed paint is sent into paint inlet, then the mixed paint is stirred by the paint inlet for the second time, and the mixed paint is continuously discharged to the roller coating assembly during stirring, then the mixed paint is coated on the surface of solid wood composite board by the roller coating assembly, then the solid wood composite board is cured and polished in turn, finally, the surface of solid wood composite board is coated with wear-resistant primer, sanding primer and topcoat layer and cured, and the finished board is obtained. The application can realize the mixed coating of PUR glue and UV paint, thereby improving the adhesion stability of paint film on the surface of the floor.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of coating process of solid wood composite floor, in particular to a kind of anti-cracking mixed coating process of PUR solid wood composite floor. BACKGROUND

[0002] The current solid wood composite floor generally uses UV paint or water-based paint for primer and topcoat, so as to improve the wear resistance, stain resistance and other physical and chemical properties of the floor;But due to the poor toughness and tear resistance of the existing UV paint and water-based paint after film coating, when the solid wood composite floor shrinks and swells or warps, the surface paint film is prone to crack and break with the deformation of the floor, thereby reducing the adhesion and aesthetics of the paint film. In view of the above problems, some manufacturers try to add PUR glue into the paint film on the surface of the floor to improve the toughness of the paint film as a whole, such as patent 201010265016.7, which coats a layer of PUR hot melt adhesive between the substrate and the paint film, so as to improve the anti-cracking performance of the surface paint film by using the PUR hot melt adhesive layer. But the defect of this paint film structure is that, due to the relatively poor adhesion of the PUR glue after complete curing, the conventional paint layer is prone to have low adhesion after being coated on the PUR glue layer, thereby reducing the product yield.

[0003] In view of the above problems, some manufacturers try to overcome this technical defect by mixing and coating PUR glue and UV paint, but since conventional PUR glue needs to be above 120℃ to reach a molten state and realize film coating, and UV paint is prone to solidification after being heated to above 120℃, the two cannot be mixed and coated by conventional process, thereby reducing the use effect of the PUR glue layer as the surface paint layer of the floor.

[0004] Therefore, the existing coating process of solid wood composite floor based on PUR glue has the problem of low adhesion of the paint layer. SUMMARY

[0005] The purpose of the present application is to provide an anti-cracking mixed coating process for PUR solid wood composite floor. It can realize the mixed coating of PUR glue and UV paint, thereby improving the adhesion stability of the paint film on the surface of the floor.

[0006] The technical solution of the present application is an anti-cracking mixed coating process for PUR solid wood composite floor, comprising the following steps:

[0007] ① Apply water-based colorant to the surface of the solid wood composite board to obtain A plate;

[0008] ② Infrared dry the surface of A plate to obtain B plate;

[0009] ③ the first stirring of the PUR glue and the UV paint in high temperature state after quantitative mixing to form mixed paint, then the mixed paint is sent into the paint inlet after the stirring is completed, to obtain C mixed paint;

[0010] ④ the second stirring of the C mixed paint by the paint inlet, and the C mixed paint is continuously discharged to the roller coating assembly during the stirring, then the C mixed paint is coated on the surface of the B plate by the roller coating assembly and solidified, to obtain D plate;

[0011] ⑤ polishing the solidified D plate to obtain E plate;

[0012] ⑥ coating wear-resistant primer, sanding primer and topcoat on the surface of the E plate in sequence and solidifying to obtain finished plate;

[0013] The mixing ratio of the UV paint and the PUR glue in the step ③ is 1:1-1.5, and the UV paint contains 1.3%-1.5% of polymerization inhibitor.

[0014] In the foregoing anti-cracking mixed coating process of the PUR solid wood composite floor, the total time of the first stirring and the second stirring of the C mixed paint is within 30 minutes; and the surface temperature of the roller coating assembly during the roller coating is 110-115℃.

[0015] In the foregoing anti-cracking mixed coating process of the PUR solid wood composite floor, the coating amount of the mixed paint in the step ③ is 40-60 g / m 2 , and the coating time of the mixed paint after mixing is within 10 minutes.

[0016] In the foregoing anti-cracking mixed coating process of the PUR solid wood composite floor, the roller coating assembly in the step ③ includes two paint rollers arranged side by side, a paint tank is formed at the gap between the two paint rollers, and a paint inlet is arranged above the paint tank; the paint inlet includes an inner cylinder, an outer cylinder is rotatably connected to the outer side of the inner cylinder, a long strip-shaped overflow port is arranged on one side of the outer cylinder, a stirring cavity is formed between the outer cylinder and the inner cylinder, a plurality of stirring rods are arranged around the inner cylinder and located in the stirring cavity, a paint inlet pipe is connected to the side wall of the outer cylinder, the connection between the paint inlet pipe and the outer cylinder is located on the side of the outer cylinder away from the overflow port in the circumferential direction, the end of the paint inlet pipe is connected to a heating stirring tank, and a swing part is connected to the outside of the outer cylinder.

[0017] In the foregoing anti-cracking mixed coating process of the PUR solid wood composite floor, the swing part includes a gear arranged on the inner cylinder, a rack is arranged outside the gear, and an electric telescopic rod is connected to the outside of the rack.

[0018] In the anti-cracking mixed coating process of the PUR solid wood composite floor, the outer cylinder is a hollow cavity structure, the cavity of the outer cylinder is filled with heating oil, and the outer part of the outer cylinder is respectively connected with a first oil inlet pipe and a first oil outlet pipe; the inner hole of the inner cylinder is filled with heating oil, and the two ends of the inner cylinder are respectively connected with a second oil inlet pipe and a second oil outlet pipe, and the outer parts of the first oil inlet pipe, the first oil outlet pipe, the second oil inlet pipe and the second oil outlet pipe are connected with a circulating heating mechanism.

[0019] In the anti-cracking mixed coating process of the PUR solid wood composite floor, the outer wall of the outer cylinder is wrapped with a heat insulation layer, and the outer part of the overflow port is connected with a flow guide plate.

[0020] In the anti-cracking mixed coating process of the PUR solid wood composite floor, when the roller coating assembly works, the inner cylinder drives the stirring rod to rotate circumferentially and stirs the mixed paint in the stirring cavity, and at the same time, the overflow port uniformly descends with the rotation of the outer cylinder, so that the mixed paint in the stirring cavity overflows from the overflow port and falls into the paint tank below; when the heating stirring pot fills the mixed paint into the stirring cavity through the paint inlet pipe after completing the first stirring, the overflow port is adjusted from the rotating descending state to the rotating ascending state, so that the overflow amount of the mixed paint is kept within a constant range.

[0021] In the anti-cracking mixed coating process of the PUR solid wood composite floor, in the step ③, the mixed paint is first stirred in the heating stirring pot for 20-25 minutes for the first time, and then is stirred in the stirring cavity for the second time and discharged from the overflow port.

[0022] In the anti-cracking mixed coating process of the PUR solid wood composite floor, the upper part of the paint tank is provided with a sensor for detecting the storage amount of the mixed paint in the paint tank, and the rotating speed of the outer cylinder is controlled by the swing part according to the storage amount of the mixed paint in the paint tank; the stirring amount of the mixed paint is controlled by the heating stirring pot according to the extension length of the electric telescopic rod.

[0023] Compared with the prior art, the present application has the following characteristics:

[0024] (1) By adding a polymerization inhibitor in the UV paint, the catalytic curing ability of the UV paint under high temperature can be effectively alleviated, so that the UV paint can be mixed and coated with the PUR glue under high temperature; on this basis, by limiting the amount of the polymerization inhibitor and the mixing and coating time of the mixed paint, on the one hand, the caking phenomenon of the mixed paint in this time period can be avoided, so as to leave time for mixing and coating of the mixed paint, and on the other hand, the problem that the mixed paint cannot be completely cured due to too high amount of the polymerization inhibitor can be effectively avoided, so as to ensure the curing effect and adhesion stability of the mixed paint after coating;

[0025] (2) In order to realize the mixing coating function of the mixed paint within 40 minutes, the application optimizes the structure of the roller coating assembly, so that the mixed paint can be quantitatively stirred by the heated stirring tank when in use, and then sent to the paint inlet part for secondary stirring, and in the stirring process, the mixed paint is sent to the paint tank by overflow, so as to realize continuous discharge of the mixed paint and improve the stirring effect of the mixed paint during discharge;

[0026] (3) The discharge mode through the long strip-shaped overflow port can effectively improve the coverage effect of the mixed paint on the painting roller after entering the paint tank, that is, reduce the flow of the mixed paint in the paint tank. In this state, the manufacturer can effectively reduce the amount of mixed paint reserved in the paint tank, thereby shortening the waiting time of the mixed paint in the paint tank, that is, prolonging the stirring time of the mixed paint and improving the stirring effect;

[0027] (4) Through the structural optimization of the paint inlet part, on the one hand, the continuous discharge of the mixed paint can be realized by rotating the outer cylinder, and on the other hand, the flexible control of the stirring time and the discharge amount of the mixed paint can also be realized. On the basis of this structure, when the heated stirring tank regularly sends a certain amount of mixed paint into the stirring cavity, the outer cylinder can drive the overflow port to move upward by rotating, so as to avoid the overflow of a large amount of mixed paint after entering the stirring cavity, that is, to ensure the conveying effect of the mixed paint;

[0028] (5) Through the mutual correlation of the sensor, the swing part and the heated stirring tank, the application can also adjust the conveying efficiency of the subsequent mixed paint according to the amount of mixed paint in the paint tank, thereby avoiding the prolongation of the overall stirring and coating time of the mixed paint after the accumulation of the mixed paint in the paint tank, and further reducing the possibility of caking of the mixed paint during painting;

[0029] Therefore, the application can realize the mixed coating of PUR glue and UV paint, thereby improving the adhesion stability of the paint film on the floor surface. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of the application;

[0031] Figure 2 is an enlarged view of A of Figure 1 ; is a sectional view of the paint inlet part.

[0032] Figure 3 is a sectional view of the paint inlet part.

[0033] The marks in the drawings are: 1-painting roller, 2-paint tank, 3-inner cylinder, 4-outer cylinder, 5-overflow port, 6-stirring cavity, 7-stirring rod, 8-paint inlet pipe, 9-heated stirring tank, 10-gear, 11-rack, 12-electric telescopic rod, 13- guide plate. DETAILED DESCRIPTION

[0034] The application will be further described in conjunction with the accompanying drawings and examples, but not as the basis for limiting the application.

[0035] Embodiment. A crack-proof mixed coating process for PUR solid wood composite floor, comprising the following steps:

[0036] ① coating the surface of solid wood composite board with water-based colorant to obtain A board;

[0037] ② performing infrared drying on the surface of A board to obtain B board;

[0038] ③ performing first stirring on the PUR glue and UV paint in high temperature state after quantitative mixing to form mixed paint, and then sending the mixed paint into the paint inlet after the stirring is completed to obtain C mixed paint;

[0039] ④ performing second stirring on C mixed paint by the paint inlet, and continuously discharging C mixed paint to the roller coating assembly during the stirring, and then coating C mixed paint on the surface of B board by the roller coating assembly and solidifying to obtain D board;

[0040] ⑤ polishing the solidified D board to obtain E board;

[0041] ⑥ coating wear-resistant primer, sanding primer and topcoat on the surface of E board in sequence and solidifying to obtain finished board;

[0042] The mixing ratio of UV paint and PUR glue in step ③ is 1:1, and the UV paint contains 1.3% to 1.5% of polymerization inhibitor.

[0043] The total time of first stirring and second stirring of C mixed paint is within 30 minutes, and the surface temperature of the roller coating assembly during roller coating is 110 to 115℃.

[0044] The coating amount of mixed paint in step ③ is 40 to 60 g / m 2 , and the coating time of mixed paint after mixing is within 10 minutes.

[0045] The roller coating assembly in step ③ is composed of Figure 1As shown, it comprises two painting rollers 1 arranged side by side, which are provided with heating function and roll paint at 110-115℃, and a paint tank 2 is formed at the gap of the two painting rollers 1, and a paint inlet is arranged above the paint tank 2; the paint inlet comprises an inner cylinder 3, an outer cylinder 4 is rotatably connected to the outer side of the inner cylinder 3, the inner cylinder 3 and the outer cylinder 4 are connected to each other through rotating sealing structure at both ends, the end of the inner cylinder 3 extends to the outer side of the outer cylinder 4 and is connected with a driving motor through a chain transmission mechanism, one side of the outer cylinder 4 is provided with a long strip-shaped overflow port 5, a stirring cavity 6 is formed between the outer cylinder 4 and the inner cylinder 3, a plurality of stirring rods 7 are annularly distributed around the inner cylinder 3 and located in the stirring cavity 6, the stirring rods 7 are circular tube structures and are fixedly connected to the inner cylinder 3 at both ends, the stirring rods 7 and the inner hole of the inner cylinder 3 are connected or separated from each other, the outer cylinder 4 is connected with a paint inlet pipe 8, the connection between the paint inlet pipe 8 and the outer cylinder 4 is located on the side of the outer cylinder 4 away from the overflow port 5 in the circumferential direction, the end of the paint inlet pipe 8 is connected with a heating stirring tank 9, the heating stirring tank 9 is a conventional stirring tank with quantitative heating and stirring function, and the outer part of the outer cylinder 4 is connected with a swinging part.

[0046] The swinging part comprises a gear 10 arranged on the inner cylinder 3, the outer part of the gear 10 is provided with a rack 11, the outer side of the rack 11 is connected to a mounting frame through a slide rail, and the outer part of the rack 11 is connected with an electric telescopic rod 12.

[0047] The outer cylinder 4 is a hollow cavity structure, the cavity of the outer cylinder 4 is filled with heating oil, and the outer part of the outer cylinder 4 is respectively connected with a first oil inlet pipe and a first oil outlet pipe; the inner hole of the inner cylinder 3 is filled with heating oil, and the two ends of the inner cylinder 3 are respectively connected with a second oil inlet pipe and a second oil outlet pipe, and the outer part of the first oil inlet pipe, the first oil outlet pipe, the second oil inlet pipe and the second oil outlet pipe is connected with a circulating heating mechanism, which is a conventional heating mechanism for heating oil, and the mixed paint in the stirring cavity 6 is heated by the heating mechanism and kept within the range of 120-125℃.

[0048] The outer wall of the outer cylinder 4 is wrapped with a heat insulation layer, and the outer part of the overflow port 5 is connected with a flow guide plate 13, which prevents the mixed paint from flowing through the surface of the outer cylinder 4 when overflowing.

[0049] When the roller assembly works, the stirring rods 7 are driven by the inner cylinder 3 to rotate circumferentially and stir the mixed paint in the stirring cavity 6, at the same time, the overflow port 5 uniformly drops with the rotation of the outer cylinder 4, so that the mixed paint in the stirring cavity 6 overflows from the overflow port 5 and falls into the paint tank 2 below; when the heating stirring tank 9 fills the mixed paint into the stirring cavity 6 through the paint inlet pipe 8 after completing the first stirring, the overflow port 5 is adjusted from the rotating downward state to the rotating upward state, so that the overflow amount of the mixed paint is kept within a constant range.

[0050] The mixed paint in the step ③ is firstly stirred in the heating stirring tank 9 for 25 minutes, and then is secondly stirred in the stirring cavity 6 and discharged from the overflow port 5.

[0051] The paint tank 2 is provided with a sensor for detecting the mixed paint storage in the paint tank 2, which can be a laser range finder.

[0052] The working principle of the present application is that the mixed paint storage in the paint tank 2 is measured by the sensor, and the electric telescopic rod 12 is controlled according to the mixed paint storage, so as to adjust the rotating angle of the outer cylinder 4 and realize the adjustment of the mixed paint discharge amount.

[0053] Under the above cooperation, the present application can realize the closed-loop control of the mixed paint painting speed, and the stirring time of the mixed paint is controlled within 30 minutes, and the mixed paint can be roller coated to the floor surface within 10 minutes after entering the paint tank 2, so as to effectively reduce the residence waiting time of the mixed paint in a certain place, reduce the solidification and caking problem of the mixed paint caused by the too long heating time, and ensure the mixed painting effect on the floor.

Claims

1. A crack-proof mixed coating process for PUR solid wood composite floor, characterized in that, It comprises the following steps: ①applying water-based colorant on the surface of the solid wood composite board to obtain A board; ②performing infrared drying on the surface of the A board to obtain B board; ③performing first stirring on the PUR glue and UV paint in high temperature state after quantitative mixing to form mixed paint, and then sending the mixed paint into the paint inlet after the stirring is completed to obtain C mixed paint; ④performing second stirring on the C mixed paint by the paint inlet, continuously discharging the C mixed paint into the roller coating assembly in the stirring process, and then coating the C mixed paint on the surface of the B board by the roller coating assembly and solidifying to obtain D board; ⑤polishing the solidified D board to obtain E board; ⑥applying wear-resistant primer, sanding primer and topcoat on the surface of the E board in sequence and solidifying to obtain finished board; The mixing ratio of the UV paint and the PUR glue in the step ③ is 1:1-1.5, and the UV paint contains 1.3%-1.5% of polymerization inhibitor; The coating amount of the mixed paint in the step ③ is 40-60 g / m², and the coating time of the mixed paint after mixing is within 10 minutes; The roller coating assembly in the step ④ comprises two coating rollers (1) arranged side by side, a paint tank (2) is formed at the gap between the two coating rollers (1), and a paint inlet is arranged above the paint tank (2); the paint inlet comprises an inner cylinder (3), an outer cylinder (4) is rotatably connected to the outer side of the inner cylinder (3), a long strip-shaped overflow port (5) is arranged on one side of the outer cylinder (4), a stirring cavity (6) is formed between the outer cylinder (4) and the inner cylinder (3), a plurality of stirring rods (7) are arranged in the stirring cavity (6) around the inner cylinder (3), a paint inlet pipe (8) is connected to the side wall of the outer cylinder (4), the connection between the paint inlet pipe (8) and the outer cylinder (4) is located on the side of the outer cylinder (4) away from the overflow port (5) in the circumferential direction, the end of the paint inlet pipe (8) is connected to a heating stirring tank (9), and a swing part is connected to the outside of the outer cylinder (4); The swing part comprises a gear (10) arranged on the inner cylinder (3), a rack (11) arranged on the outside of the gear (10), and an electric telescopic rod (12) connected to the outside of the rack (11); When the roller coating assembly works, the stirring rods (7) are driven to rotate in the circumferential direction by the inner cylinder (3) to stir the mixed paint in the stirring cavity (6), and the overflow port (5) uniformly descends with the rotation of the outer cylinder (4) to make the mixed paint in the stirring cavity (6) overflow from the overflow port (5) and fall into the paint tank (2) below; when the heating stirring tank (9) fills the mixed paint into the stirring cavity (6) after the first stirring is completed, the overflow port (5) is adjusted from the rotating descending state to the rotating ascending state to keep the overflow amount of the mixed paint within a constant range.

2. The anti-cracking mixed coating process for the PUR solid wood composite floor according to claim 1, characterized in that: The total time of the first stirring and the second stirring of the C mixed paint is within 30 minutes, and the surface temperature of the roller coating assembly during the roller coating is 110-115 ℃.

3. The anti-cracking mixed coating process for the PUR solid wood composite floor according to claim 1, characterized in that: The outer cylinder (4) is a hollow cavity structure, the cavity of the outer cylinder (4) is filled with heating oil, and the outer cylinder (4) is respectively connected with a first oil inlet pipe and a first oil outlet pipe; the inner hole of the inner cylinder (3) is filled with heating oil, and the two ends of the inner cylinder (3) are respectively connected with a second oil inlet pipe and a second oil outlet pipe, and the outer parts of the first oil inlet pipe, the first oil outlet pipe, the second oil inlet pipe and the second oil outlet pipe are connected with a circulating heating mechanism.

4. The anti-cracking mixed coating process for the PUR solid wood composite floor according to claim 1, characterized in that: The outer wall of the outer cylinder (4) is wrapped with a heat insulation layer, and the overflow port (5) is connected with a flow guide plate (13) outside.

5. The anti-cracking mixed coating process for the PUR solid wood composite floor according to claim 1, characterized in that: The mixed paint in the step ③ is firstly stirred in the heating stirring tank (9) for 20-25 minutes, then is secondly stirred in the stirring cavity (6), and is discharged from the overflow port (5).

6. The anti-cracking mixed coating process for the PUR solid wood composite floor according to claim 1, characterized in that: The upper part of the paint tank (2) is provided with a sensor for detecting the mixed paint storage in the paint tank (2), and the rotation rate of the outer cylinder (4) is controlled by the swing part according to the mixed paint storage in the paint tank (2); and the stirring amount of the mixed paint is controlled by the heating stirring tank (9) according to the extension length of the electric telescopic rod (12). The outer wall of the outer cylinder (4) is wrapped with a heat insulation layer, and the overflow port (5) is connected with a flow guide plate (13) outside. The mixed paint in the step ③ is firstly stirred in the heating stirring tank (9) for 20-25 minutes, then is secondly stirred in the stirring cavity (6), and is discharged from the overflow port (5). The upper part of the paint tank (2) is provided with a sensor for detecting the mixed paint storage in the paint tank (2), and the rotation rate of the outer cylinder (4) is controlled by the swing part according to the mixed paint storage in the paint tank (2); and the stirring amount of the mixed paint is controlled by the heating stirring tank (9) according to the extension length of the electric telescopic rod (12).

Images