WO2021196263A1

WO2021196263A1 - Spc-based 3d printed plate and preparation method therefor

Info

Publication number: WO2021196263A1
Application number: PCT/CN2020/084275
Authority: WO
Inventors: 唐道远
Original assignee: 安徽森泰木塑科技地板有限公司
Priority date: 2020-03-30
Filing date: 2020-04-28
Publication date: 2021-10-07
Also published as: CN111231430A

Abstract

The present invention relates to an SPC-based 3D printed plate, which belongs to the technical field of plate manufacturing. The plate comprises an SPC substrate layer, a 3D printing color layer and a UV protective layer; the substrate layer comprises an SPC core layer and a background film layer which is co-extruded and laminated with the SPC core layer; a texture having a wood grain, a pattern or a design is also impressed on the background film layer; or the SPC substrate layer comprises an SPC core layer and a background film layer which is laminated with the SPC core layer by on-line press fitting, and further comprises a resin recessed-raised effect layer, the resin recessed-raised effect layer being provided between the color layer and the UV protective layer. By laminating the background film layer which can be made of a PVC material on the SPC substrate layer, the present invention effectively replaces a series of operations in the prior art, i.e. "1) cleaning a PVC board substrate; 2) applying a UV primer on the surface of the PVC board substrate; 3) drying and curing the UV primer; 4) applying a white UV top paint; and 5) curing and drying the UV white paint", simplifying the production process, thereby improving the production efficiency.

Description

SPC-based 3D printing plate and preparation method thereof

Technical field

The invention relates to a printing plate, in particular to an SPC-based 3D printing plate and a preparation method thereof. It belongs to the technical field of SPC-based indoor flooring.

Background technique

The process of producing SPC-based indoor flooring in the prior art is: the extruder first extrudes the PVC-containing SPC substrate, and then separately heats the PVC base film, PVC color film, PVC wear-resistant layer and SPC substrate through a four-roll calender. Compressed and compounded. In the process of pressing and pasting, the flowers are synchronized to achieve the effect of imitating wood texture. But this has the following disadvantages: (1) To produce the floor, you need to order the PVC color film first, and the PVC color film is scheduled first, which causes the production cycle to be too long; (2) To solve the problem of the production cycle is too long, usually through standing inventory. Solved, but the standing inventory caused a large accumulation of unused color films in the warehouse; (3) When ordering PVC color films, there is a restriction on the minimum order quantity of PVC color films with a single pattern; (4) It is impossible to customize the color film that the customer really wants The PVC color film with the desired pattern can only be selected from the limited number of PVC color films provided by the upstream supplier.

technical problem

The Chinese invention patent application with application number 201811628557.4 discloses a 3D effect PVC decorative board and a production method of 3D printing. The production process of the board is as follows: 1) Clean the PVC board substrate; 2) Coat the surface of the PVC board substrate with UV primer; 3) Dry and cure the UV primer; 4) Apply white UV topcoat; 5) UV White paint is cured and dried; 6) Flatbed inkjet printer prints patterns; 7) Coated UV wear-resistant paint; 8) UV wear-resistant paint is cured and dried; 9) Flatbed inkjet printer prints the concave-convex effect layer; then UV lamp irradiates and cures; 10 ) Coating UV topcoat; 11) Curing and drying. This solution overturns the previous production method that requires ordering color film first, and solves the problems of inventory, long production cycle, minimum order quantity limitation, and personalized needs in one fell swoop. This has a significant effect on the production and operation of SPC indoor floor manufacturers. However, the operation of the method itself is relatively cumbersome. It not only needs to apply the primer or topcoat over and over again, but the applied primer or topcoat cannot be completed in one station, which seriously affects the production efficiency.

Technical solutions

The present invention aims to solve the above-mentioned technical problems, thereby providing an SPC-based 3D printing board. The board has a hierarchical structure that is different from any kind of board in the prior art, and this specific hierarchical structure enables the board of the present invention to increase the characteristics of high production efficiency on the basis of maintaining the performance characteristics of the original board.

The technical solutions of the present invention to solve the above problems are as follows:

An SPC-based 3D printing board, the board comprising an SPC substrate layer, a color layer presented on the SPC substrate layer by 3D printing, and a UV protection layer covering the color layer; the substrate layer It includes an SPC core layer and a background film layer compounded with the SPC core layer by co-extrusion; the background film layer is also embossed with wood grain, pattern or pattern texture;

Or the SPC substrate layer includes an SPC core layer and a background film layer compounded with the SPC core layer by in-line pressing, and also includes a resin concave-convex effect layer, the resin concave-convex effect layer is disposed on the color layer And the UV protection layer.

In the above technical scheme of the present invention, the background film layer that can be made of PVC material is compounded on the SPC substrate layer, which effectively replaces the prior art, "1) clean the PVC board substrate; 2) on the PVC board substrate The surface is coated with UV primer; 3) UV primer is dried and cured; 4) white UV topcoat is coated; 5) UV white paint is cured and dried; "a series of operations simplifies the production process, thereby improving production efficiency.

In the above technical solution of the present invention, the operation of first engraving and then printing the concave-convex effect layer is also subversively proposed; based on this idea, a background film layer can be attached to the core layer first, which is equivalent to step 2 in the Chinese invention patent of 201811628557.4 )~Step 5), and you can also directly engrave the background film with a printing roller, which is equivalent to completing steps 7)~9), and then print the concave-convex effect layer through a flat-panel inkjet printer. Finish the effect of step 6); finally apply a UV protective layer to effectively protect the printed uneven effect layer.

In the above technical solution of the present invention, since the order of engraving and printing is reversed compared to the prior art, the UV protection layer is equivalent to completing steps 7) to 8) and steps 10) to 11) at the same time. It can be seen that the present invention greatly shortens the process and greatly improves the operability of the process. In the prior art, because the pattern is printed first, and then the pattern is printed (the flat inkjet printer prints the concave-convex effect layer), the pattern must have a carrier, which can be a PVC white film or a paint layer, such as 201811628557.4 The integrated effect of step 2) ~ step 5) in the Chinese invention patent of the United States; but in the present invention, the background film layer is equivalent to the above-mentioned carrier. In order to improve the production efficiency, the carrier is not pasted by glue, nor It is applied by paint; it is extruded on the surface of the SPC core layer by co-extrusion technology. The advantages of this are good controllability and high production efficiency. Its disadvantage is that the background of the co-extrusion PVC material The surface of the film is very smooth, and the effect of direct printing of the pattern is not good, and even problems such as ghosting may occur; the prior art usually solves the problem of poor printing of the pattern (wood grain, pattern or pattern texture). The surface is coated with a layer of compatibilizer, which can alleviate the problem to a certain extent, but it still cannot be effectively solved.

When solving the above-mentioned problems, the present invention adopts the method of sequentially swapping the "printing pattern layer" and "printing concave-convex effect layer", and the "printing concave-convex effect layer" is used to roll engrave the concave-convex effect on the PVC background film layer. Layer" instead; this way, on the one hand, it solves the problem of the poor effect of the direct printing pattern, because it first carries out the roll-engraved concave-convex effect layer (showing the texture of wood grain or pattern or other patterns) to make the PVC material The surface of the background film is no longer smooth; on the other hand, it effectively shortens the process, and directly converts the operations that need to be carried out on the flatbed inkjet printer into the extrusion from the extruder and the online roll engraving, which makes the process Become concise and improve the controllability; moreover, this "inverted" method also has a significant impact on the subsequent process steps, making the process more concise, as disclosed in the prior art 201811628557.4 Chinese invention patent. Steps 2 to 5 and steps 10 to 11 are all UV paint and then cured, that is, in the prior art, the treatment needs to be performed at two stations. However, the "inverted" method of the present invention is directly performed on the background film layer. Roller engraves the concave-convex effect layer, so the operations equivalent to steps 2 to 5 are omitted, so only painting and curing are required in one station, which is equivalent to the original steps 7)~8) and steps 10)~11 ) Combine the two into one, forming the wear-resistant layer of the present invention, that is, the UV protection layer; in addition, using the method of the present invention, a simple roller engraving machine can be used to replace the expensive and high-precision "printing uneven effect layer" "The flat-panel inkjet printer has significantly reduced production costs.

In order to achieve better abrasion resistance and protection effects, the wear-resistant layer of the present invention is upgraded on the basis of one bottom and one side in the prior art, such as five bottoms and two sides, so as to achieve a significant protection effect.

However, the 3D visual effect of the present invention is slightly different from the prior art. The principle of the 3D visual effect of the present invention is like watching small insects in amber. The surface of the product is flat and smooth, but it can be intuitively felt. To achieve the stereoscopic visual effect of the product; and the existing technology produces the product through a complicated process, because the process of printing the concave-convex effect layer is later, so the surface of the product is concave and convex. This 3D stereoscopic effect is more direct, but because Its internal pattern layer is flat, but its overall 3D visual effect is slightly uncoordinated.

More importantly, in the prior art, in order to achieve the effect of synchronously aligning the flowers, the flatbed inkjet printer has very strict requirements for printing the concave-convex effect layer. When the impact produces the concave-convex effect, it needs to be strictly controlled against the original pattern and cannot produce 1mm. Even smaller left-to-right deviation and/or front-to-back deviation, once the concave-convex effect and the pattern are not matched, it will seriously respond to the 3D visual effect; therefore, specific equipment is required and tens of millions of investment are required. In the present invention, since the engraving is carried out first, and then the color deposition (printing) is carried out. At this time, due to the previous engraving, the effects of depth, light and darkness are first produced, even if the same color is used, the stereoscopic visual effect can be displayed. ; The principle is like the following snow. Different places in the same area have different ground surfaces. After the ground snows indiscriminately, due to angles and light, the snow in some places looks bright, and the snow in some places looks biased in color. Dark, some even gray. The present invention is also the same. After first engraving, when printing based on this principle, there is no need to perform high-precision alignment of the flowers (printing different colors on different parts), just print without distinction. The unique 3D visual effect of the present invention can be realized. Of course, using multiple colors to accurately print different colors on different parts can reflect the better 3D visual effect of the present invention.

Preferably, the color of the background film layer is white or light color with covering properties.

Preferably, the material of the background film layer is PVC.

Another object of the present invention is to provide a method for preparing the above-mentioned SPC-based 3D printing plate.

A preparation method of SPC-based 3D printing plate includes the following steps:

a. Add the raw materials and additives that make up the SPC core layer to the main extruder. The raw materials and the additives that make up the core layer are melted through the main extruder, and extruded into the main channel of the mold, from the die lip of the mold. Extrusion to form a core layer of SPC stone plastic material;

b. Add the PVC raw materials and additives constituting the background film layer to the auxiliary extruder, and the PVC raw materials and additives constituting the background film layer are melted through the auxiliary extruder, and extruded into the auxiliary flow channel of the mold, and pass After the auxiliary runner, diffuse in the co-extrusion casting space of the mold, wrap the core layer produced in the step a, and pass the heat exchange effect of the cooling runner plate of the mold, solidify and shape, and finally remove the mold from the mold. Orifice extrusion to obtain the precursor structure of the SPC substrate layer;

c. Pass the precursor structure of the SPC substrate layer through the action of the embossing roller to engrave the texture of wood grain, pattern or pattern on the precursor structure of the SPC substrate layer to obtain the SPC substrate layer;

d. Input the substrate layer to an online 3D printing device, and print the color corresponding to the texture of wood grain, pattern or pattern on the SPC substrate layer to obtain an intermediate product;

e. Apply UV primer and UV topcoat sequentially on the intermediate product, and light-curing separately to form a UV protective layer.

In the above technical scheme of the present invention, since the raw material of the SPC stone plastic substrate and the PVC raw material as the background film layer have highly similar physical and chemical properties, they have good composite properties after co-extrusion and no adhesive is required. Direct co-extrusion has a strong connection force.

Preferably, the UV primer in step e is applied 3 to 6 times, and the UV top coat is applied 1 to 3 times.

Preferably, the UV protection layer described in step e is formed by using a UV curable coating containing silica and/or alumina, and the amount of silica and/or alumina added is controlled within the quality of the UV curable coating Of 1~10wt%.

In the above technical scheme of the present invention, the addition of silica and/or alumina can significantly improve the hardness, wear resistance and burning resistance of the UV protective layer.

As a preference, in the above technical solution of the present invention, step b is changed to: the PVC film constituting the background film layer is unrolled and the core layer of SPC stone plastic material obtained in step a is combined by in-line rolling to obtain the SPC base The precursor structure of the material layer.

As a preference, in the above technical solution of the present invention, step b is changed to: the PVC film constituting the background film layer is unrolled and the core layer of SPC stone plastic material obtained in step a is combined by in-line rolling to obtain the SPC base Wood layer

Change step c to: input the SPC substrate layer obtained in step b into the pattern printing area of the 3D online printing device, and print a flat wood grain, pattern or pattern on the SPC substrate layer to obtain intermediate product one;

Change step d to: input the intermediate product 1 obtained in step c into the concave-convex effect molding area of the 3D online printing device, and print the concave-convex effect layer to obtain intermediate product two;

Change step e to: coat the second intermediate product obtained in step d with a UV primer and a UV topcoat, and light-cure them separately to form a UV protective layer.

Beneficial effect

In summary, the present invention has the following beneficial effects:

1. The present invention subversively proposes the operation of first engraving and then printing. First, a substrate layer with a background film layer is prepared by a co-extrusion method, and then the engraving is performed, followed by printing, and finally the UV protection layer is applied to make the Compared with the existing technology, the invention greatly simplifies the production process, thereby greatly improving the production efficiency;

2. The product made by the method of the present invention has the advantage of good 3D visual effects;

3. The UV protection layer of the present invention is also added with some additives, such as silica, alumina, etc.; it can significantly improve the wear resistance and burn resistance of the UV protection layer. The additive amount is controlled at 1~10wt%, and it can be uniformly dispersed in the UV light-cured coating by a high-speed dispersant when in use.

Description of the drawings

Figure 1 is a schematic diagram of the mold structure of the present invention;

2 is a schematic diagram showing the cross-sectional structure of the co-extrusion casting space in the mold of the present invention;

Fig. 3 is a test table of the results of bonding strength and immersion peeling degree of the product of Example 1 of the present invention.

In the figure, 10-main runner, 20-die lip, 30-auxiliary runner, 40-co-extrusion casting space, 50-cooling runner plate, 60-die.

The best mode of the present invention

Example one

An SPC-based 3D printing board, the board comprising a stone plastic (SPC) substrate layer, a color layer presented on the stone plastic (SPC) substrate layer by 3D printing, and a UV covering the color layer Protective layer; the stone plastic (SPC) substrate layer includes a stone plastic (SPC) core layer and a background film layer compounded with the stone plastic (SPC) core layer; the material of the background film layer is PVC; the The background film is also embossed with a wood grain texture. The color of the background film layer is white with covering properties.

1 and 2, a method for preparing an SPC-based 3D printing plate includes the following steps:

a. Add the raw materials and additives constituting the core layer of stone plastic (SPC) into the main extruder, and the raw materials and additives constituting the core layer are melted through the main extruder and extruded into the main runner 10 of the mold , Extrude from the die lip 20 of the mold to form a core layer of stone plastic (SPC) material;

b. Add the PVC raw materials and additives constituting the background film layer to the auxiliary extruder, and the PVC raw materials and additives constituting the background film layer are melted by the auxiliary extruder, and extruded into the auxiliary runner 30 of the mold After passing through the auxiliary runner 30, it diffuses in the co-extrusion casting space 40 of the mold, the core layer produced in step a is covered, and the heat exchange effect of the cooling runner plate 50 of the mold is used to solidify and shape, Finally, extrude from the die opening 60 of the mold to obtain the precursor structure of the SPC substrate layer;

c. Pass the precursor structure of the SPC substrate layer through the action of the embossing roller to carve wood grain on the precursor structure of the SPC substrate layer to obtain the SPC substrate layer;

d. Input the SPC base material layer to an online 3D printing device, and print the color corresponding to the wood grain on the SPC base material layer to obtain an intermediate product;

e. Carry out primer coating 5 times on the intermediate product, then light curing, and then top coating 2 times, light curing to form a UV protection layer; the formation of the UV protection layer is made of silica and alumina For UV-curable coatings, the total amount of silica and alumina added is controlled at 5wt% of the quality of the UV-curable coatings.

Embodiments of the present invention

The present invention will be further explained below in conjunction with the drawings.

This specific embodiment is only an explanation of the present invention, not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be subject to the patent law as long as they fall within the scope of the claims. protect.

Example two

The difference from the first embodiment is: change step b to: change the PVC film that constitutes the background film layer, through unwinding and the core layer of SPC stone plastic material obtained in step a, through on-line roll pressing, to obtain the SPC substrate The precursor structure of the layer. In this embodiment, the PVC film is a preformed film; and in the first embodiment, the PVC film is co-extruded with a core layer formed of a stone plastic (SPC) material through an extruder.

Example three

The difference from the first embodiment is: change step b to: change the PVC film that constitutes the background film layer, through unwinding and the core layer of SPC stone plastic material obtained in step a, through on-line roll pressing, to obtain the SPC substrate Floor;

According to GB/T17657-2013 "Test method for physical and chemical properties of wood-based panels and facing wood-based panels" and GB/T 18103-2013 6.3.2 Related content of "Solid wood composite floor" The product of Example 1 was tested to test its bonding strength and immersion peeling degree, and the results are shown in Figure 3.

Claims

1. An SPC-based 3D printing sheet, characterized in that: the sheet includes an SPC substrate layer, a color layer presented on the SPC substrate layer by 3D printing, and a UV protection layer covering the color layer The SPC substrate layer includes an SPC core layer and a background film layer compounded with the SPC core layer by co-extrusion, the background film layer is also embossed with wood grain, pattern or pattern texture; Or the SPC substrate layer includes an SPC core layer and a background film layer compounded with the SPC core layer by in-line pressing, and also includes a resin concave-convex effect layer, the resin concave-convex effect layer is disposed on the color layer And the UV protection layer.

2. The SPC-based 3D printing sheet according to claim 1, wherein the color of the background film layer is white or light color with covering properties.

3. An SPC-based 3D printing sheet according to claim 1 or 2, wherein the background film layer is made of PVC.

4. A method for preparing an SPC-based 3D printing board according to claim 1, comprising the following steps: a. Adding the raw materials and additives constituting the SPC core layer to the main extruder, and the main extruder The raw materials and additives constituting the core layer are melted and extruded into the main runner (10) of the mold, and extruded from the lip (20) of the mold to form the core layer of SPC stone plastic material; b. The background film layer will be formed The PVC raw materials and their additives are added to the auxiliary extruder, the PVC raw materials and their additives that constitute the background film layer are melted by the auxiliary extruder, and extruded into the auxiliary runner (30) of the mold, and pass through the auxiliary runner After (30), spread in the co-extrusion casting space (40) of the mold, cover the core layer produced in step a, and pass the heat exchange effect of the cooling runner plate (50) of the mold to solidify and set Finally, extrude from the die (60) of the mold to obtain the precursor structure of the SPC substrate layer; c. Pass the precursor structure of the SPC substrate layer through the action of the embossing roller, on the precursor structure of the substrate layer Carve out the wood grain, pattern or pattern texture to obtain the SPC base material layer; d. Input the SPC base material layer to the 3D online printing equipment, and print out the wood grain, pattern or pattern on the SPC base material layer The color corresponding to the texture of the pattern is used to obtain an intermediate product; e. Apply a UV primer and a UV topcoat on the intermediate product in sequence, and then photo-curing to form a UV protective layer.

5. A method for preparing an SPC-based 3D printing plate according to claim 4, wherein the UV primer application in step e is performed: T6 times, and the UV topcoat application is performed: T3 times.

6. A method for preparing an SPC-based 3D printing sheet according to claim 4, wherein the UV protection layer in step e is formed by using UV light containing silica and/or alumina. For curing coatings, the amount of silica and/or alumina added is controlled at ri0wt% of the quality of the UV curable coatings.

7. A method for preparing an SPC-based 3D printing plate according to claim 4, characterized in that: step b is changed to: the PVC film constituting the background film layer is unrolled and the SPC stone plastic obtained in step a The core layer of the material is combined by in-line roll pressing to obtain the precursor structure of the SPC substrate layer.

8. A method for preparing an SPC-based 3D printing plate according to claim 4, characterized in that: step b is changed to: the PVC film constituting the background film layer is unrolled and the SPC stone plastic obtained in step a The core layer of the material is compounded by online roller pressing to obtain the SPC substrate layer; step c is changed to: input the SPC substrate layer obtained in step b into the pattern printing area of the 3D online printing device, and the SPC substrate layer Print out the flat wood grain, pattern or pattern on the board to obtain the intermediate product. Change step d to: input the intermediate product 1 obtained in step C into the concave-convex effect molding area of the 3D online printing device, and print the concave-convex effect layer to obtain the intermediate product two ; Change step e to: coat UV primer and UV topcoat on the second intermediate product obtained in step d, and then light-cured to form a UV protective layer.