Environment-friendly paint-free plate

Abstract

The invention relates to the technical field of decorative plates, and discloses an environment-friendly paint-free plate which comprises a base plate, a modified composite non-woven fabric is arranged on the surface of the base plate, and the lower surface of the modified composite non-woven fabric and the base plate are bonded through environment-friendly glue; a ground color coating is arranged on the upper surface of the modified composite non-woven fabric, a decorative layer is arranged on the upper surface of the ground color coating, the decorative layer is directly formed on the upper surface of the ground color coating through ink-jet printing, and a protective layer is arranged on the upper surface of the decorative layer. The invention has the beneficial effects of energy conservation and environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of furniture boards, and in particular to an environmentally friendly paint-free board. Background Art

[0002] In the home furnishing industry, the use of board materials (mainly wood boards) is very large. The most common paint-free boards usually include wood boards, technological veneers compounded on the surface of wood boards, and decorative paper compounded on the surface of technological veneers (also called coated paper or impregnated paper). Technological veneers are made of solid wood veneers bonded by impregnating glue. When used, they are compounded on the surface of the wood board by hot pressing. Decorative paper is also compounded on the surface of the technological veneer by hot pressing. Both technological veneers and decorative paper are bonded by impregnating glue. The impregnating glue contains a large amount of formaldehyde and has a low environmental protection level. Summary of the invention

[0003] In order to solve the above problems of the paint-free board in the prior art, the present invention provides an energy-saving and environmentally friendly paint-free board.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: An environmentally friendly paint-free board comprises a substrate, the surface of the substrate is provided with a modified composite non-woven fabric, the lower surface of the modified composite non-woven fabric is bonded to the substrate by an environmentally friendly adhesive; the upper surface of the modified composite non-woven fabric is provided with a base color coating, the upper surface of the base color coating is provided with a decorative layer, the decorative layer is directly formed on the upper surface of the base color coating by inkjet printing, and the upper surface of the decorative layer is provided with a protective layer.

[0005] By adopting the above technical scheme: using modified composite non-woven fabric to replace technological veneer, using inkjet printing decorative layer to replace decorative paper and directly printing and compounding, the lower surface of the modified composite non-woven fabric is directly bonded and compounded with the substrate through environmentally friendly glue, the modified composite non-woven fabric does not contain formaldehyde, and is more environmentally friendly as a whole; using modified composite non-woven fabric to replace technological veneer saves solid wood, and at the same time the overall quality is more controllable and the product uniformity is better (technological veneer is made of solid wood veneer, and the quality of technological veneer is limited by the type of solid wood veneer, moisture content, stump, etc.); the processing process does not contain hot pressing steps (the existing technological veneer and decorative paper are all compounded by hot pressing), eliminating hot pressing equipment and hot pressing energy consumption, and the overall energy-saving and environmental protection effect is better.

[0006] Preferably, the thickness of the modified composite non-woven fabric is configured to be 0.2-0.4 mm, and the gram weight of the modified composite non-woven fabric is configured to be 120-240 g / ㎡.

[0007] Preferably, the protective layer is a UV protective layer, which plays an effective role in waterproofing and anti-wearing, and protects the durability and stability of the decorative layer.

[0008] Preferably, the modified composite non-woven fabric is made by impregnating the composite non-woven fabric with a modified slurry and drying and curing it; the modified slurry comprises the following components in parts by weight: 5-8 parts of calcium carbonate powder, 6-10 parts of bamboo pulp fiber, 15-35 parts of adhesive, 0.5-2 parts of coupling agent, and 0.6-1.5 parts of dispersant.

[0009] After the composite non-woven fabric is modified by the modified slurry, the pores in the composite non-woven fabric are filled with the modified slurry, so that the hardness, strength and light-shielding properties of the composite non-woven fabric are improved, while the ductility (to prevent stretching and cracking), air permeability and water absorption (to prevent glue penetration during subsequent use) of the composite non-woven fabric are reduced. A base coating is set on the surface of the modified composite non-woven fabric. The base coating is smoother and less prone to cracking. During subsequent inkjet printing (pattern or texture), the pattern is clearer, the adhesion is stable and less prone to cracking.

[0010] Preferably, the composite non-woven fabric comprises a non-woven fabric base layer and a melt-blown layer disposed on the lower surface of the non-woven fabric base layer; the preparation method of the non-woven fabric base layer is as follows: prepare the following fibers by weight: 5-8 parts of viscose fiber, 7-9 parts of resin fiber, 3-5 parts of bamboo charcoal fiber, and 3-6 parts of polyester fiber, and mix, open, comb, spunlace or needle punch the above fibers to form a non-woven fabric base layer. Polyester fiber increases the tensile strength of the non-woven fabric, and the bamboo charcoal fiber contains dense pores inside, which can absorb harmful substances emitted from the substrate (if the substrate itself is a plywood or a composite board), and the environmental protection level of the paint-free board is extremely high.

[0011] Preferably, when preparing the meltblown layer, the polymer melt in the meltblowing die head comprises the following components in parts by weight: 5-8 parts of polypropylene fiber and 2-3 parts of ES bonding fiber; the melt flow index of the polymer melt is 90-120 g / 10 min, the temperature of the meltblowing die head is 195-205° C., the air flow injection angle in the meltblowing die head is 35-40°, the pressure of the hot air flow in the meltblowing die head is 0.1-0.18 MPa, and the polymer melt extrusion amount is 0.2-0.4 g / hole / min.

[0012] The fibers of the meltblown layer are denser and the pores are smaller, which results in different porosities of the non-woven fabric base layer and the meltblown layer. After subsequent infiltration with the modified slurry, the non-woven fabric base layer contains more modified slurry and the meltblown layer contains less modified slurry. Therefore, the non-woven fabric base layer has higher hardness, is smoother, and has lower water absorption. The upper surface of the non-woven fabric base layer is smoother when preparing the base color coating, which reduces ink penetration and makes the pattern clearer. The hardness of the meltblown layer is relatively low, the water absorption is relatively high, and the toughness is better. When in use, the lower surface of the meltblown layer is compounded with the board through water-based environmentally friendly glue. The glue can better penetrate into the meltblown layer but cannot penetrate the non-woven fabric layer. While improving the composite strength of the meltblown layer and the board, it can effectively prevent the glue from penetrating the non-woven fabric. Moreover, the meltblown layer made of polypropylene fiber has better sound insulation effect, which can improve the sound insulation effect of the board after compounding with the board.

[0013] Preferably, the lower surface of the non-woven fabric base layer is subjected to hot rolling after the meltblown layer is prepared, and after being soaked in the modified slurry, it passes through the first double-roller extrusion zone, the pre-drying zone, the second double-roller extrusion zone, and the drying zone in sequence; the hardened slurry in the modified composite non-woven fabric after the pre-drying zone reaches the basic hardening stage, and then enters the second double-roller extrusion zone, and finally reaches the complete hardening stage in the drying zone. The treatment method of one extrusion, pre-drying, secondary extrusion, and drying is adopted to eliminate the internal stress of the modified slurry during the hardening process, and prevent the modified composite non-woven fabric from partial cracking, wrinkling, and arching due to uneven stress. At the same time, secondary rolling is performed in the basic hardening stage to make the surface of the non-woven fabric smoother, which is conducive to the preparation of a smoother base color coating.

[0014] Preferably, a plurality of spherical bosses distributed in an array are provided on the circumferential surface of the roller body corresponding to the lower surface of the modified composite nonwoven fabric in the second double-roll extrusion zone, and the spherical bosses are rolled on the lower surface of the modified composite nonwoven fabric to form spherical concave holes, and the depth of the spherical concave holes is 0.1-0.15mm. When compounded with the substrate through environmentally friendly glue, the spherical concave holes can increase the bonding surface and improve the bonding strength; on the other hand, the modified composite nonwoven fabric can increase the sound insulation performance of the board after being compounded with the board. Since the glue in the spherical concave holes and the modified composite nonwoven fabric have different components, when the sound wave is incident from one medium (modified nonwoven fabric) to another medium (solidified glue) with different acoustic properties, reflection will occur at the interface between the two media (the spherical surface wall of the spherical concave hole), and the sound will be reflected in different directions along the spherical surface, thereby greatly weakening the penetration of the sound and improving the sound insulation effect.

[0015] Preferably, the base color coating is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight groups: 5-12 parts of nano titanium dioxide, 20-28 parts of adhesive, 0.6-1.35 parts of coupling agent, and 0.3-0.5 parts of dispersant; wherein the particle size of the nano titanium dioxide is 10-30nm. In order to reduce costs, 1000 mesh calcium carbonate powder is usually selected, that is, the particle size is about 13μm (i.e. 13000nm), so the surface of the modified composite non-woven fabric is relatively rough and the inkjet printing quality is poor. After the base color coating is prepared by the base color slurry, since the particle size of the nano titanium dioxide is much smaller than that of the calcium carbonate powder, the surface of the base color coating is smoother and flatter, and the pattern after inkjet printing is clearer and the color fidelity is preserved.

[0016] Preferably, the base color slurry further comprises the following weight components: 2-4 parts of precipitated barium sulfate powder and 0.1-0.3 parts of defoamer; wherein the particle size of the precipitated barium sulfate powder is 200-400nm. The defoamer can eliminate bubbles in the slurry when stirring the base color slurry, making the base color coating smoother; the precipitated barium sulfate powder itself is white, and the particle size difference between the precipitated barium sulfate powder and the nano titanium dioxide powder is used to make the surface roughness of the base color coating finally prepared greater than that of the nano titanium dioxide powder alone, and this roughness can increase the surface area of ​​inkjet printing and improve the adhesion performance of the ink and the base color coating.

[0017] Therefore, the present invention has the following beneficial effects: (1) the modified composite non-woven fabric is used to replace the technological veneer, and is directly composited with the substrate through environmentally friendly glue, thereby eliminating the technological veneer and the hot pressing connection process between the technological veneer and the substrate, resulting in lower energy consumption in the production process, no formaldehyde, and better environmental performance; (2) the decorative paper is replaced by an inkjet-printed decorative layer, thereby eliminating the decorative paper and the hot pressing process of the decorative paper, the decorative layer does not contain formaldehyde, and has good environmental performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of the present invention.

[0019] Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle.

[0020] In the figure: substrate 1, modified composite non-woven fabric 2, environmentally friendly glue 3, base color coating 4, decorative layer 5, DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0022] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0023] Embodiment 1: like Figure 1 and Figure 2 An environmentally friendly paint-free board shown includes a substrate 1, a surface of the substrate 1 is provided with a modified composite non-woven fabric 2, the lower surface of the modified composite non-woven fabric 2 is bonded to the substrate by an environmentally friendly adhesive 3; the upper surface of the modified composite non-woven fabric 1 is provided with a base color coating 4, the upper surface of the base color coating 4 is provided with a decorative layer 5, the decorative layer is directly formed on the upper surface of the base color coating by inkjet printing, and the upper surface of the decorative layer 5 is provided with a protective layer 6; the thickness of the modified composite non-woven fabric is configured to be 0.2 mm, the gram weight of the modified composite non-woven fabric is configured to be 120 g / ㎡, and the protective layer is configured as a UV protective layer.

[0024] The modified composite non-woven fabric 2 is made by impregnating the composite non-woven fabric with a modified slurry, drying and curing the composite non-woven fabric; the modified slurry comprises the following components by weight: 5 parts of calcium carbonate powder, 6 parts of bamboo pulp fiber, 15 parts of adhesive, 0.5 parts of coupling agent, and 0.6 parts of dispersant; wherein the particle size of the calcium carbonate powder is 800-1200 mesh; The composite non-woven fabric includes a non-woven fabric base layer 20 and a meltblown layer 21 arranged on the lower surface of the non-woven fabric base layer; the preparation method of the non-woven fabric base layer 20 is as follows: prepare fibers according to the following weight parts: 5 parts of viscose fiber, 7 parts of resin fiber, 3 parts of bamboo charcoal fiber, and 3 parts of polyester fiber, mix the above fibers, open, comb, and spunlace to form a non-woven fabric base layer.

[0025] When preparing the meltblown layer 21, the polymer melt in the meltblowing die includes the following components in parts by weight: 5 parts of polypropylene fiber and 2 parts of ES bonding fiber; the melt flow index of the polymer melt is 90g / 10min, the temperature of the meltblowing die is 195°C, the air flow injection angle in the meltblowing die is 35°, the pressure of the hot air flow in the meltblowing die is 0.1Mpa, and the polymer melt extrusion amount is 0.2g / hole / min.

[0026] After the meltblown layer 21 is prepared on the lower surface of the non-woven fabric base layer 20, a hot rolling treatment is performed. After the composite non-woven fabric is impregnated with the modified slurry, it passes through the first double-roll extrusion zone, the pre-drying zone, the second double-roll extrusion zone, and the drying zone in sequence; the hardened slurry in the modified composite non-woven fabric after the pre-drying zone reaches the basic hardening stage, and then enters the second double-roll extrusion zone, and finally reaches the complete hardening stage in the drying zone.

[0027] The base color coating 4 is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight components: 5 parts of nano titanium dioxide, 20 parts of adhesive, 0.6 parts of coupling agent, and 0.3 parts of dispersant; the particle size of the nano titanium dioxide is 10-30nm, and the particle size of the precipitated barium sulfate powder is 200-400nm.

[0028] Embodiment 2: like Figure 1 and Figure 2 An environmentally friendly paint-free board shown includes a substrate 1, a surface of the substrate 1 is provided with a modified composite non-woven fabric 2, the lower surface of the modified composite non-woven fabric 2 is bonded to the substrate by an environmentally friendly adhesive 3; the upper surface of the modified composite non-woven fabric 1 is provided with a base color coating 4, the upper surface of the base color coating 4 is provided with a decorative layer 5, the decorative layer is directly formed on the upper surface of the base color coating by inkjet printing, and the upper surface of the decorative layer 5 is provided with a protective layer 6; the thickness of the modified composite non-woven fabric is configured to be 0.4 mm, the gram weight of the modified composite non-woven fabric is configured to be 240 g / ㎡, and the protective layer is configured as a UV protective layer.

[0029] The modified composite non-woven fabric 2 is made by impregnating the composite non-woven fabric with a modified slurry, drying and curing the composite non-woven fabric; the modified slurry comprises the following components by weight: 8 parts of calcium carbonate powder, 10 parts of bamboo pulp fiber, 35 parts of adhesive, 2 parts of coupling agent, and 1.5 parts of dispersant; wherein the particle size of the calcium carbonate powder is 800-1200 mesh; The composite non-woven fabric includes a non-woven fabric base layer 20 and a meltblown layer 21 arranged on the lower surface of the non-woven fabric base layer; the preparation method of the non-woven fabric base layer 20 is as follows: prepare fibers according to the following weight parts: 8 parts of viscose fiber, 9 parts of resin fiber, 5 parts of bamboo charcoal fiber, and 6 parts of polyester fiber, mix the above fibers, open, comb, and needle-punch to form a non-woven fabric base layer.

[0030] When preparing the meltblown layer 21, the polymer melt in the meltblowing die includes the following components in parts by weight: 8 parts of polypropylene fiber and 3 parts of ES bonding fiber; the melt flow index of the polymer melt is 120g / 10min, the temperature of the meltblowing die is 205°C, the air flow injection angle in the meltblowing die is 40°, the pressure of the hot air flow in the meltblowing die is 0.18Mpa, and the polymer melt extrusion amount is 0.4g / hole / min.

[0031] After the meltblown layer 21 is prepared on the lower surface of the non-woven fabric base layer 20, a hot rolling treatment is performed. After the composite non-woven fabric is impregnated with the modified slurry, it passes through the first double-roll extrusion zone, the pre-drying zone, the second double-roll extrusion zone, and the drying zone in sequence; the hardened slurry in the modified composite non-woven fabric after the pre-drying zone reaches the basic hardening stage, and then enters the second double-roll extrusion zone, and finally reaches the complete hardening stage in the drying zone; The base color coating 4 is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight components: 12 parts of nano titanium dioxide, 28 parts of adhesive, 1.35 parts of coupling agent, and 0.5 parts of dispersant; wherein the particle size of the nano titanium dioxide is 10-30nm, and the particle size of the precipitated barium sulfate powder is 200-400nm.

[0032] Embodiment 3: like Figure 1 and Figure 2 An environmentally friendly paint-free board shown includes a substrate 1, a surface of the substrate 1 is provided with a modified composite non-woven fabric 2, and the lower surface of the modified composite non-woven fabric 2 is bonded to the substrate by an environmentally friendly adhesive 3; the upper surface of the modified composite non-woven fabric 1 is provided with a base color coating 4, and the upper surface of the base color coating 4 is provided with a decorative layer 5, the decorative layer is directly formed on the upper surface of the base color coating by inkjet printing, and the upper surface of the decorative layer 5 is provided with a protective layer 6; the thickness of the modified composite non-woven fabric is configured to be 0.3 mm, the gram weight of the modified composite non-woven fabric is configured to be 180 g / ㎡, and the protective layer is configured as a UV protective layer.

[0033] The modified composite non-woven fabric 2 is made by impregnating the composite non-woven fabric with a modified slurry, drying and curing the slurry; the modified slurry comprises the following components by weight: 7 parts of calcium carbonate powder, 8 parts of bamboo pulp fiber, 25 parts of adhesive, 1.3 parts of coupling agent, and 1 part of dispersant; wherein the particle size of the calcium carbonate powder is 800-1200 mesh; The composite non-woven fabric includes a non-woven fabric base layer 20 and a meltblown layer 21 arranged on the lower surface of the non-woven fabric base layer; the preparation method of the non-woven fabric base layer 20 is as follows: prepare fibers according to the following weight parts: 6.5 parts of viscose fiber, 8 parts of resin fiber, 4 parts of bamboo charcoal fiber, and 5 parts of polyester fiber, mix the above fibers, open, comb, and spunlace to form a non-woven fabric base layer.

[0034] When preparing the meltblown layer 21, the polymer melt in the meltblowing die includes the following components in parts by weight: 6 parts of polypropylene fiber and 2.5 parts of ES bonding fiber; the melt flow index of the polymer melt is 105g / 10min, the temperature of the meltblowing die is 200°C, the air flow injection angle in the meltblowing die is 38°, the pressure of the hot air flow in the meltblowing die is 0.14Mpa, and the polymer melt extrusion amount is 0.3g / hole / min.

[0035] After the meltblown layer 21 is prepared on the lower surface of the non-woven fabric base layer 20, a hot rolling treatment is performed. After the composite non-woven fabric is impregnated with the modified slurry, it passes through the first double-roll extrusion zone, the pre-drying zone, the second double-roll extrusion zone, and the drying zone in sequence; the hardened slurry in the modified composite non-woven fabric after the pre-drying zone reaches the basic hardening stage, and then enters the second double-roll extrusion zone, and finally reaches the complete hardening stage in the drying zone; The base color coating 4 is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight components: 8 parts of nano titanium dioxide, 24 parts of adhesive, 1.15 parts of coupling agent, and 0.4 parts of dispersant; wherein the particle size of the nano titanium dioxide is 10-30nm.

[0036] Embodiment 4: The difference between this embodiment and embodiment 3 is that: after the meltblown layer 21 is prepared on the lower surface of the non-woven fabric base layer 20, a hot rolling treatment is performed, and the composite non-woven fabric is impregnated with the modified slurry and sequentially passes through the first double-roll extrusion zone, the pre-drying zone, the second double-roll extrusion zone, and the drying zone; the hardened slurry in the modified composite non-woven fabric after the pre-drying zone reaches the basic hardening stage, and then enters the second double-roll extrusion zone, and finally reaches the complete hardening stage in the drying zone; wherein the circumferential surface of the roller body corresponding to the lower surface of the modified composite non-woven fabric in the second double-roll extrusion zone is provided with a plurality of spherical bosses distributed in an array, and the spherical bosses are rolled on the lower surface of the modified composite non-woven fabric 2 to form spherical concave holes 210, and the depth of the spherical concave holes 210 is 0.1 mm. The spherical pits can effectively increase the bonding surface area and improve the bonding strength, thereby further improving the sound insulation performance.

[0037] The remaining structures and parameters are the same as those in Example 3.

[0038] Embodiment 5: The difference between this embodiment and embodiment 3 is that the base color coating 4 is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight components: 8 parts of nano titanium dioxide, 4 parts of precipitated barium sulfate powder, 24 parts of adhesive, 1.15 parts of coupling agent, 0.4 parts of dispersant, and 0.3 parts of defoaming agent; wherein the particle size of the nano titanium dioxide is 10-30nm, and the particle size of the precipitated barium sulfate powder is 200-400nm. By utilizing the particle size difference between the nano titanium dioxide and the precipitated barium sulfate powder, the roughness of the base color coating surface is improved, thereby increasing the surface area of ​​inkjet printing, so that the inkjet printing effect is better and the ink adhesion performance is better.

[0039] The remaining structures and parameters are the same as those in Example 3.

[0040] Embodiment 6: The difference between this embodiment and embodiment 3 is that: after the meltblown layer 21 is prepared on the lower surface of the non-woven fabric base layer 20, a hot rolling treatment is performed, and the composite non-woven fabric is impregnated with the modified slurry and passes through the first double-roller extrusion zone, the pre-drying zone, the second double-roller extrusion zone, and the drying zone in sequence; the hardened slurry in the modified composite non-woven fabric after passing through the pre-drying zone reaches the basic hardening stage, and then enters the second double-roller extrusion zone, and finally reaches the complete hardening stage in the drying zone; wherein a plurality of spherical bosses distributed in an array are provided on the circumferential surface of the roller body corresponding to the lower surface of the modified composite non-woven fabric in the second double-roller extrusion zone, and the spherical bosses are rolled on the lower surface of the modified composite non-woven fabric 2 to form spherical concave holes 210, and the depth of the spherical concave holes 210 is 0.15 mm.

[0041] The base color coating 4 is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight components: 8 parts of nano titanium dioxide, 2 parts of precipitated barium sulfate powder, 24 parts of adhesive, 1.15 parts of coupling agent, 0.4 parts of dispersant, and 0.1 of defoaming agent; wherein the particle size of the nano titanium dioxide is 10-30nm, and the particle size of the precipitated barium sulfate powder is 200-400nm.

[0042] The remaining structures and parameters are the same as those in Example 3.

[0043] In the above embodiments 1-6, the environmentally friendly glue uses water-based environmentally friendly glue (such as polyvinyl alcohol environmentally friendly glue), the adhesive uses water-based acrylic resin, the coupling agent uses silane coupling agent (kh550), the dispersant uses ammonium salt dispersant (such as polyacrylate ammonium salt dispersant), and the defoamer uses mineral oil defoamer (such as polyether modified silicone oil defoamer); the above environmentally friendly glue, adhesive, coupling agent, dispersant, and defoamer are all purchased directly. The substrate uses a wooden board, which can be a solid wooden board or an artificial wooden board.

[0044] The environmentally friendly paint-free board in the above embodiment eliminates the hot pressing process during the processing and manufacturing process, and has lower energy consumption; modified composite non-woven fabric is used instead of technological veneer (technological veneer is bonded by impregnated glue and contains formaldehyde), and inkjet printed decorative layer is used instead of bonded decorative paper (decorative paper is hot-pressed and composited by impregnated glue and contains formaldehyde). Therefore, in the processing process of the environmentally friendly paint-free board in this embodiment, no formaldehyde-containing materials or formaldehyde-containing adhesives will be used, so the overall environment is more environmentally friendly.

[0045] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by up, down, left, right, inside, outside, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0046] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. An environmentally friendly paint-free board, comprising a substrate, Its characteristics are: The surface of the substrate is provided with a modified composite non-woven fabric, and the lower surface of the modified composite non-woven fabric is bonded to the substrate by an environmentally friendly adhesive; A base color coating is provided on the upper surface of the modified composite nonwoven fabric, a decorative layer is provided on the upper surface of the base color coating, the decorative layer is directly formed on the upper surface of the base color coating by inkjet printing, and a protective layer is provided on the upper surface of the decorative layer.

2. The environmentally friendly paint-free board according to claim 1, Its characteristics are: The thickness of the modified composite non-woven fabric is configured to be 0.2-0.4 mm, and the gram weight of the modified composite non-woven fabric is configured to be 120-240 g / ㎡.

3. An environmentally friendly paint-free board according to claim 1 or 2, Its characteristics are: The protective layer is configured as a UV protective layer.

4. An environmentally friendly paint-free board according to claim 1, 2 or 3, Its characteristics are: The modified composite non-woven fabric is made by impregnating the composite non-woven fabric with the modified slurry and drying and solidifying it; The modified slurry comprises the following components in parts by weight: 5-8 parts of calcium carbonate powder, 6-10 parts of bamboo pulp fibers, 15-35 parts of adhesive, 0.5-2 parts of coupling agent, and 0.6-1.5 parts of dispersant.

5. The environmentally friendly paint-free board according to claim 4, Its characteristics are: The composite nonwoven fabric comprises a nonwoven fabric base layer and a meltblown layer arranged on the lower surface of the nonwoven fabric base layer; The preparation method of the non-woven fabric base layer is as follows: prepare fibers according to the following weight parts: 5-8 parts of viscose fiber, 7-9 parts of resin fiber, 3-5 parts of bamboo charcoal fiber, and 3-6 parts of polyester fiber, and mix, open, comb, spunlace or needle-punch the above fibers to form a non-woven fabric base layer.

6. The environmentally friendly paint-free board according to claim 5, Its characteristics are: When preparing the meltblown layer, the polymer melt in the meltblowing die head includes the following components by weight: 5-8 parts of polypropylene fiber and 2-3 parts of ES bonding fiber; The melt flow index of the polymer melt is 90-120 g / 10 min, the temperature of the melt spraying die is 195-205°C, the air flow injection angle in the melt spraying die is 35-40°, the pressure of the hot air flow in the melt spraying die is 0.1-0.18 MPa, and the polymer melt extrusion amount is 0.2-0.4 g / hole / min.

7. The environmentally friendly paint-free board according to claim 5, Its characteristics are: The non-woven fabric base layer is subjected to hot rolling after the melt-blown layer is prepared, and then is infiltrated with the modified slurry and sequentially passes through a first double-roll extrusion zone, a pre-drying zone, a second double-roll extrusion zone, and a drying zone; The hardened slurry in the modified composite nonwoven fabric reaches the basic hardening stage after passing through the pre-drying zone, and then enters the second double-roll extrusion zone, and finally reaches the complete hardening stage in the drying zone.

8. The environmentally friendly paint-free board according to claim 7, Its characteristics are: The second A plurality of spherical bosses distributed in an array are arranged on the circumferential surface of the roller body corresponding to the lower surface of the modified composite nonwoven fabric in the double-roller extrusion zone. The spherical bosses are rolled on the lower surface of the modified composite nonwoven fabric to form spherical concave holes, and the depth of the spherical concave holes is 0.1-0.15mm.

9. The environmentally friendly paint-free board according to claim 1, Its characteristics are: The base color coating is formed by rolling the base color slurry on the upper surface of the modified composite non-woven fabric and curing it. The base color slurry includes the following weight components: 5-12 parts of nano titanium dioxide, 20-28 parts of adhesive, 0.6-1.35 parts of coupling agent, and 0.3-0.5 parts of dispersant; wherein the particle size of the nano titanium dioxide is 10-30nm.

10. The environmentally friendly paint-free board according to claim 9, Its characteristics are: The base color slurry also includes the following weight components: 2-4 parts of precipitated barium sulfate powder, 0.1-0.3 parts of defoaming agent; The particle size of the precipitated barium sulfate powder is 200-400nm.

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