Juglans-imitated color master batch, preparation method thereof and preparation method of Juglans-imitated polyolefin floor

Abstract

The invention relates to a special color master batch for imitating walnut wood, a preparation method of the color master batch and a method for preparing a walnut wood imitating polyolefin floor by using the color master batch. The walnut-imitated color master batch comprises the following components in percentage by mass: 10-12% of titanium dioxide, 2.5-3.0% of carbon black, 3-5% of iron oxide red, 2-4% of iron oxide yellow, 0.5-1% of phthalocyanine blue, 1-2% of a dispersing agent and the balance of a resin carrier, and the sum of the components is 100%. According to the technical scheme, through three key technologies of accurate color matching of multiple pigments, efficient dispersion and temperature gradient control, the walnut-wood-imitating polyolefin floor achieves the level of natural walnut wood in the dimensions of color simulation degree, texture stereoscopic impression and the like, and exceeds the level of the natural walnut wood in the indexes of material cost, weather resistance, processing efficiency, environmental friendliness and the like.

Description

Technical Field

[0001] The invention relates to a masterbatch, in particular to a masterbatch specially used for imitating walnut, a preparation method of the masterbatch and a method for preparing walnut-imitation polyolefin flooring using the masterbatch. Background Art

[0002] Walnut is a widely used high-end furniture and decorative material worldwide. Its distinctive curly grain and fiddleback pattern create a fine, smooth, and naturally transitioning texture, with a gradient from warm brown to dark brown (similar to Pantone colors 14-1212TCX "Walnut Brown" to 16-1315TCX "Dark Walnut"). The heartwood is a deep chocolate brown, while the sapwood ranges from light brown to golden yellow. Natural oxidation forms a layer on the surface, giving it a matte finish.

[0003] Due to the limited availability and high price of natural walnut, imitation walnut materials (such as wood-plastic composites and impregnated paper laminated wood flooring) have become alternatives. However, the key challenge lies in accurately recreating the grain, color, and texture of walnut. Conventional wood-plastic composites (WPC) use PE, PP, or PVC as a matrix and wood powder as a filler. They are manufactured through extrusion to produce flooring, wallboard, and other materials. While their advantages lie in their low cost and corrosion resistance, they suffer from monotonous color and a harsh texture. Impregnated paper laminated wood flooring (LPL) achieves a wood-like effect by printing a wood grain pattern and laminating it with a film. However, the surface has poor wear and weather resistance and is prone to fading. Currently, the most common method is to slice solid walnut into veneers with a thickness of 0.2-0.8mm and laminate them onto other solid wood. However, this method also has some inherent disadvantages: 1. The adhesive may contain formaldehyde; 2. The bonding strength may be insufficient; and 3. Even with sufficient production capacity, it still requires a large amount of solid walnut.

[0004] Therefore, there is an urgent need in the art for a floor that does not require consumption of solid walnut wood and has the appearance of walnut (especially the appearance of North American walnut). Summary of the Invention

[0005] The present invention addresses the aforementioned issues. In its first aspect, it provides a masterbatch for walnut imitation. This masterbatch, through the synergy of multiple hues, accurately reproduces the warm to dark brown gradient of walnut (similar to Pantone color charts 14-1212TCX to 16-1315TCX), avoiding the dull coloration often associated with a single pigment.

[0006] The technical solutions of the present invention for solving the above problems are as follows:

[0007] A walnut-like color masterbatch comprising the following components in the following mass proportions:

[0008] Titanium dioxide 10~12%

[0009] Carbon black 2.5~3.0%

[0010] Iron oxide red 3~5%

[0011] Iron oxide yellow 2~4%

[0012] Phthalocyanine blue 0.5~1%

[0013] Dispersant 1~2%

[0014] The balance of resin carrier is that the sum of all components meets 100%.

[0015] In the above technical solution of the present invention, a warm brown tone is imparted by combining red iron oxide and yellow iron oxide, simulating the natural color of walnut wood after oxidation; a dark brown base tone is provided by combining carbon black with other colors; phthalocyanine blue is used to fine-tune the hue to neutralize the coolness of carbon black and avoid darkening the color; titanium dioxide is used to adjust the brightness, weaken the contrast of dark wood grain, and increase the sense of layering; that is, through the coordination of multiple hues, the warm brown to dark brown gradient of walnut wood (similar to the Pantone color card 14-1212TCX to 16-1315TCX) is accurately restored, avoiding the dull color caused by a single pigment.

[0016] As a preferred embodiment of the above technical solution, the dispersant is an acrylic ester copolymer containing a hydroxyl functional group; and the resin carrier is PE.

[0017] As a preferred embodiment of the above technical solution, the acrylic ester copolymer is BYK-180.

[0018] As a preferred embodiment of the above technical solution, the masterbatch further comprises 5-10 wt% of nano-silicon dioxide.

[0019] As a preferred embodiment of the above technical solution, the masterbatch further includes a first antioxidant, a first light stabilizer, a first internal lubricant and a first external lubricant.

[0020] As a preferred embodiment of the above technical solution, the first antioxidant is antioxidant 1010, the first light stabilizer is UV-531, the first internal lubricant is polyethylene wax, and the first external lubricant is calcium stearate.

[0021] As a preferred embodiment of the above technical solution, the masterbatch is composed of the following raw materials in the following mass ratios:

[0022] Titanium dioxide 10~12%

[0023] Carbon black 2.5~3.0%

[0024] Iron oxide red 3.9~4.0%

[0025] Iron oxide yellow 3.0~3.1%

[0026] Phthalocyanine blue 0.5~0.6%

[0027] Dispersant 1~2%

[0028] Nano-silicon dioxide 5~8%

[0029] First antioxidant 0.1~0.2%

[0030] First light stabilizer 0.1~0.2%

[0031] First internal lubricant 1~2%

[0032] First external lubricant 0.2~0.3%

[0033] The balance of resin carrier PE, the sum of each component meets 100%.

[0034] In a second aspect, the present invention provides a method for preparing the above masterbatch.

[0035] The technical solution is as follows:

[0036] The method for preparing imitation walnut color masterbatch comprises the steps of preparing the color masterbatch from the raw materials through a strand pelletizer.

[0037] As a preferred embodiment of the above technical solution, during the use of the strand pelletizer, the temperature of zone 1 is controlled at 75-80°C, the temperature of zones 3-6 is controlled at 195-200°C, and the temperature of zone 7 is controlled at 185-190°C, and then extrusion and pelletizing are performed.

[0038] In the above technical solution of the present invention, the temperature of zone 1 is 75-80°C to prevent pre-melting of the carrier resin; the temperature of zones 3 to 6 is 195-200°C, which significantly improves the dispersibility of various color powders in the resin melt; and the temperature of zone 7 is lowered to 185-190°C to inhibit thermal degradation of the carrier resin.

[0039] In a third aspect, the present invention provides a method for preparing a walnut-like polyolefin floor.

[0040] The technical solution is as follows:

[0041] A method for preparing a walnut-like polyolefin floor comprises the first step of adjusting an initial flooring formula containing color powder to a conversion formula; and

[0042] The second step is to prepare the material according to the conversion formula, and then pass it through a wood plastic extruder and a mold to make a floor intermediate; and

[0043] a third step of using a pattern roller engraved with walnut grain to engrave walnut grain on the floor intermediate;

[0044] The conversion formula includes the following components in parts by mass:

[0045] Wood flour 15~25%

[0046] Masterbatch 4~6%

[0047] POE 1~3%

[0048] PE-g-MAH 1~3%

[0049] Second internal lubricant 2~4%

[0050] Second external lubricant 0.6~0.9%

[0051] Second antioxidant 0.2~0.5%

[0052] Second light stabilizer 0.2~0.5%

[0053] The balance of the basic resin HDPE, the sum of each component meets 100%;

[0054] The masterbatch is composed of the following raw materials in percentage by mass:

[0055] Titanium dioxide 10~12%

[0056] Carbon black 2.5~3.0%

[0057] Iron oxide red 3.9~4.0%

[0058] Iron oxide yellow 3.0~3.1%

[0059] Phthalocyanine blue 0.5~0.6%

[0060] Dispersant 1~2%

[0061] Nano-silicon dioxide 5~8%

[0062] First antioxidant 0.1~0.2%

[0063] First light stabilizer 0.1~0.2%

[0064] First internal lubricant 1~2%

[0065] First external lubricant 0.2~0.3%

[0066] The balance of resin carrier PE, the sum of each component meets 100%.

[0067] As a preferred embodiment of the above technical solution, the first antioxidant and the second antioxidant are antioxidant 1010, the first light stabilizer and the second stabilizer are UV-531, the first internal lubricant and the second internal lubricant are polyethylene wax, and the first external lubricant and the second external lubricant are calcium stearate.

[0068] In a fourth aspect, the present invention provides another method for preparing the imitation walnut polyolefin floor.

[0069] The technical solution is as follows:

[0070] A method for preparing a walnut-like polyolefin floor comprises the following steps:

[0071] S1, use the main extruder to melt and plasticize the core layer raw material, and then extrude it into the main channel of the co-extrusion die;

[0072] S2, using a first auxiliary extruder to melt and plasticize the first surface layer raw material into a first melt, and then extruding it into a first side flow channel of a co-extrusion die;

[0073] S2, using a second auxiliary extruder to melt and plasticize the second surface layer raw material into a second melt, and then extruding it into the second side flow channel of the co-extrusion die;

[0074] S3, co-extruding the core layer raw material, the first surface layer raw material, and the second surface layer raw material from the co-extrusion die to produce a floor intermediate in which a first surface layer with a thickness of 0.2 to 0.5 mm is coated with a second surface layer with a thickness of 1.0 to 2.0 mm, and the second surface layer coats the core layer;

[0075] S4. solidifying the floor intermediate by cooling;

[0076] S5. Heating the floor intermediate to soften the first surface layer and the second surface layer;

[0077] S6. Using a pattern roller engraved with walnut wood grain, engrave walnut wood grain on both the first surface layer and the second surface layer to obtain an engraved intermediate; the engraving depth of the pattern roller exceeds the thickness of the first surface layer by at least 0.2 mm and does not exceed the thickness of the second surface layer;

[0078] S7, grinding the engraved intermediate to remove at least 0.2 mm and no more than 0.3 mm of thickness to obtain the imitation walnut-colored polyolefin floor;

[0079] The first surface layer material uses a first imitation walnut masterbatch, and the formula of the first imitation walnut masterbatch is as follows:

[0080] Titanium dioxide 10%

[0081] Carbon black 3.0%

[0082] Iron oxide red 3.9~4.0%

[0083] Iron oxide yellow 3.0~3.1%

[0084] Phthalocyanine blue 0.5~0.6%

[0085] Dispersant 1~2%

[0086] Nano-silicon dioxide 5~8%

[0087] First antioxidant 0.1~0.2%

[0088] First light stabilizer 0.1~0.2%

[0089] First internal lubricant 1~2%

[0090] First external lubricant 0.2~0.3%

[0091] The balance of resin carrier PE, the sum of each component meets 100%;

[0092] The second surface layer material uses a second imitation walnut masterbatch, and the formula of the second imitation walnut masterbatch is as follows:

[0093] Titanium dioxide 12%

[0094] Carbon black 2.5%

[0095] Iron oxide red 3.9~4.0%

[0096] Iron oxide yellow 3.0~3.1%

[0097] Phthalocyanine blue 0.5~0.6%

[0098] Dispersant 1~2%

[0099] Nano-silicon dioxide 5~8%

[0100] First antioxidant 0.1~0.2%

[0101] First light stabilizer 0.1~0.2%

[0102] First internal lubricant 1~2%

[0103] First external lubricant 0.2~0.3%

[0104] The balance of resin carrier PE, the sum of each component meets 100%.

[0105] In summary, the present invention has the following beneficial effects:

[0106] 1. This invention accurately restores the warm brown to dark brown gradient of walnut wood through the coordination of multiple hues, avoiding the dull color caused by a single pigment;

[0107] 2. Nano-silica and hydroxyl acrylate copolymer (BYK-180) work synergistically to significantly improve pigment dispersion, leaving no color spots or agglomeration on the surface of the product;

[0108] 3. Accurately match the walnut color, with color difference ΔE < 1.5 (no color difference when visually observed), which is more than 50% higher than the traditional color powder direct addition method (ΔE > 3.0);

[0109] 4. Use strand pelletizing technology to control the temperature gradient (75-80°C in zone 1, 195-200°C in zones 3-6), combine nano-silica and lubricants to optimize melt fluidity, and eliminate or reduce the use of internal lubricants.

[0110] 5. In the preferred solution, the natural wood grain three-dimensional effect is achieved through double-layer co-extrusion and pattern roller depth control (0.2~0.5mm thicker than the first surface layer) combined with the wear-resistant layer design;

[0111] 6. In summary, this technical solution, through the three key technologies of "precise color matching of multiple pigments + efficient dispersion + temperature gradient control", has achieved the goal of making the imitation walnut polyolefin flooring reach the level of natural walnut in terms of color simulation and texture three-dimensionality, and surpass the level of natural walnut in terms of material cost, weather resistance, processing efficiency, environmental protection and other indicators. DETAILED DESCRIPTION

[0112] This specific implementation is merely an explanation of the present invention and is not intended to limit the present invention. Any changes made by those skilled in the art after reading the specification will be protected by patent law as long as they are within the scope of the claims.

[0113] Example 1

[0114] A walnut-like masterbatch is composed of the following raw materials in the following mass proportions:

[0115] HDPE 66.5%

[0116] Titanium dioxide 11%

[0117] Carbon black 2.6%

[0118] Iron oxide red 4.0%

[0119] Iron oxide yellow 3.1%

[0120] Phthalocyanine blue 0.5%

[0121] Dispersant BYK-180 1.8%

[0122] Nano silicon dioxide 8%

[0123] Antioxidant 1010 0.1%

[0124] Light stabilizer UV-531 0.1%

[0125] Polyethylene wax 2%

[0126] Calcium stearate 0.3%.

[0127] The above-mentioned imitation walnut masterbatch is prepared by the following method:

[0128] Raw materials are prepared according to the above formula; the raw materials are passed through a strand pelletizer to prepare masterbatches; during the use of the strand pelletizer, the temperature of zone 1 is controlled at 80°C, the temperatures of zones 3 to 6 are controlled at 200°C, and the temperature of zone 7 is controlled at 190°C, and then extrusion and pelletization are performed to obtain imitation walnut masterbatches.

[0129] This embodiment also provides a method for preparing an imitation walnut floor, which comprises the following steps:

[0130] S1. Adjust the initial flooring formula using color powder to be converted to a conversion formula using masterbatch. In this step, the initial formula is as follows:

[0131] HDPE 66.5wt%

[0132] Wood flour 25wt%

[0133] Color powder 1.1wt%

[0134] POE 2.0wt%

[0135] PE-g-MAH 1.5wt%

[0136] Polyethylene wax 2.5wt%

[0137] Calcium stearate 0.8wt%

[0138] Antioxidant 1010 0.3wt%

[0139] Light stabilizer UV-531 0.3wt%;

[0140] After conversion into the formula:

[0141] HDPE 62.4wt%

[0142] Wood flour 25wt%

[0143] Masterbatch 5.2wt%

[0144] POE 2.0wt%

[0145] PE-g-MAH 1.5wt%

[0146] Polyethylene wax 2.5wt%

[0147] Calcium stearate 0.8wt%

[0148] Antioxidant 1010 0.3wt%

[0149] Light stabilizer UV-531 0.3wt%;

[0150] S2. Prepare materials according to the above conversion formula, melt and extrude the prepared materials using an extruder, inject them into a mold, and then extrude them from the mold to obtain a floor intermediate;

[0151] S3. Using a pattern roller engraved with walnut wood grain, engrave walnut wood grain on the floor intermediate.

[0152] Example 2

[0153] This embodiment provides two imitation walnut masterbatch formulas.

[0154] The first masterbatch formula is as follows:

[0155] HDPE 66.8wt%

[0156] Titanium dioxide 10 wt%

[0157] Carbon black 3.0 wt%

[0158] Iron oxide red 3.9 wt%

[0159] Iron oxide yellow 3.0 wt%

[0160] Phthalocyanine blue 0.5 wt%

[0161] Dispersant BYK-180 0.5 wt%

[0162] Nano-silica 10 wt%

[0163] Antioxidant 1010 0.1 wt%

[0164] Light stabilizer UV-531 0.1 wt%

[0165] Polyethylene wax 2.0wt%

[0166] Calcium stearate 0.1 wt%;

[0167] The second masterbatch formula is as follows:

[0168] HDPE 65.3wt%

[0169] Titanium dioxide 12 wt%

[0170] Carbon black 2.5 wt%

[0171] Iron oxide red 3.9 wt%

[0172] Iron oxide yellow 3.0 wt%

[0173] Phthalocyanine blue 0.5 wt%

[0174] Dispersant BYK-180 0.5wt%

[0175] Nano-silica 10 wt%

[0176] Antioxidant 1010 0.1 wt%

[0177] Light stabilizer UV-531 0.1 wt%

[0178] Polyethylene wax 2.0wt%

[0179] Calcium stearate 0.1 wt%.

[0180] The first and second masterbatches are prepared by the following method:

[0181] Raw materials are prepared according to the above formula; the raw materials are passed through a strand pelletizer to prepare masterbatches; during the use of the strand pelletizer, the temperature of zone 1 is controlled at 80°C, the temperatures of zones 3 to 6 are controlled at 200°C, and the temperature of zone 7 is controlled at 190°C, and then extruded and pelletized; and the first and second masterbatches are respectively prepared.

[0182] This embodiment also provides a method for preparing an imitation walnut floor, which comprises the following steps:

[0183] S1, use the main extruder to melt and plasticize the core layer raw material, and then extrude it into the main channel of the co-extrusion die;

[0184] S2, using a first auxiliary extruder to melt and plasticize the first surface layer raw material into a first melt, and then extruding it into a first side flow channel of a co-extrusion die;

[0185] S2, using a second auxiliary extruder to melt and plasticize the second surface layer raw material into a second melt, and then extruding it into the second side flow channel of the co-extrusion die;

[0186] S3, co-extruding the core layer raw material, the first surface layer raw material, and the second surface layer raw material from the co-extrusion die to produce a floor intermediate in which a first surface layer with a thickness of 0.2 mm is coated with a second surface layer with a thickness of 2.0 mm, and the second surface layer is coated with a core layer;

[0187] S4. solidifying the floor intermediate by cooling;

[0188] S5. Heating the floor intermediate to soften the first surface layer and the second surface layer;

[0189] S6. Using a pattern roller engraved with walnut wood grain, engrave walnut wood grain on both the first surface layer and the second surface layer to obtain an engraved intermediate; the engraving depth of the pattern roller is 0.6 mm;

[0190] S7, grinding the engraved intermediate to remove 0.25 mm of thickness to obtain the imitation walnut color polyolefin floor.

[0191] In the above-mentioned method for preparing the floor, the core layer raw material formula is as follows:

[0192] HDPE new material 32.5wt%

[0193] HDPE recycled material 28wt%

[0194] Wood flour 25wt%

[0195] Calcium carbonate 8.0wt%

[0196] PE-g-MAH 2.9wt%

[0197] Polyethylene wax 3.0wt%

[0198] Calcium stearate 0.5 wt%

[0199] Antioxidant 1010 0.1wt%;

[0200] The raw material formula of the first / second surface layer is as follows:

[0201] HDPE 77.4wt%

[0202] Wood flour 12wt%

[0203] First / second color masterbatch 5.2wt%

[0204] PE-g-MAH 1.5wt%

[0205] Polyethylene wax 2.5wt%

[0206] Calcium stearate 0.8 wt%

[0207] Antioxidant 1010 0.3wt%

[0208] Light stabilizer UV-531 0.3wt%.

[0209] Comparative Example 1

[0210] S1. Prepare materials according to the following formula, melt and extrude the prepared materials using an extruder, inject them into a mold, and then extrude them from the mold to obtain a floor intermediate;

[0211] S2. Using a wood grain roller, carve wood grain on the floor intermediate body.

[0212] The formula described in this comparative example is as follows:

[0213] HDPE 66.5wt%

[0214] Wood flour 25wt%

[0215] Color powder 1.1wt%

[0216] POE 2.0wt%

[0217] PE-g-MAH 1.5wt%

[0218] Polyethylene wax 2.5wt%

[0219] Calcium stearate 0.8wt%

[0220] Antioxidant 1010 0.3wt%

[0221] Light stabilizer UV-531 0.3wt%.

[0222] In this comparative example, the amount of toner used is the same as that in Example 1.

[0223] A colorimeter was used to measure the chromaticity (Lab* color space) of the reflected light from the surfaces of the floors of Example 1 and Comparative Example 1, and the ΔE value (color difference) compared with the standard color plate was calculated.

[0224] Steps:

[0225] Calibrate the instrument: Use a standard white or black board to calibrate the colorimeter to ensure measurement accuracy;

[0226] Sampling: Randomly select multiple points on the floor surface;

[0227] Measurement: Press the colorimeter probe vertically against the sample surface and record the Lab value (L represents lightness, a represents red-green deviation, and b represents yellow-blue deviation).

[0228] Calculate color difference: Using the standard color palette (target walnut color, Pantone 14-1212TCX) as a reference, calculate the ΔE value for each measuring point: ΔE = (L2*-L1*)² + (a2*-a1*)² + (b2*-b1*)²; where L1*, a1*, and b1* are the standard color palette values, and L2*, a2*, and b2* are the sample values.

[0229] Judgment criteria:

[0230] ΔE<1.5: The color difference is very small and there is almost no difference when viewed visually (superior product);

[0231] 1.5≤ΔE<3.0: Slight color difference, acceptable (qualified product);

[0232] ΔE ≥ 3.0: obvious color difference, unqualified.

[0233] The results are shown in Table 1.

[0234] Table 1 Color difference analysis table of examples and comparative examples Color difference ΔE Example 1 1.3 Comparative Example 1 3.6

Claims

1. A walnut-like masterbatch, characterized in that: The composition comprises the following components in the following mass ratios: Titanium dioxide 10~12% Carbon black 2.5~3.0% Iron oxide red 3~5% Iron oxide yellow 2~4% Phthalocyanine blue 0.5~1% Dispersant 1~2% The balance of resin carrier is that the sum of all components meets 100%.

2. The imitation walnut masterbatch according to claim 1, characterized in that: The dispersant is an acrylic ester copolymer containing a hydroxyl functional group; and the resin carrier is PE.

3. The imitation walnut masterbatch according to claim 2, characterized in that: The acrylate copolymer is BYK-180.

4. The imitation walnut masterbatch according to claim 1, characterized in that: The masterbatch also includes 5-10 wt% of nano silicon dioxide.

5. The imitation walnut masterbatch according to claim 1, characterized in that: The masterbatch further includes a first antioxidant, a first light stabilizer, a first internal lubricant and a first external lubricant.

6. The imitation walnut masterbatch according to claim 1, characterized in that: The masterbatch is composed of the following raw materials in the following mass ratios: Titanium dioxide 10~12% Carbon black 2.5~3.0% Iron oxide red 3.9~4.0% Iron oxide yellow 3.0~3.1% Phthalocyanine blue 0.5~0.6% Dispersant 1~2% Nano-silicon dioxide 5~8% First antioxidant 0.1~0.2% First light stabilizer 0.1~0.2% First internal lubricant 1~2% First external lubricant 0.2~0.3% The balance of resin carrier PE, the sum of each component meets 100%.

7. The method for preparing the imitation walnut masterbatch according to any one of claims 1 to 6, comprising the step of preparing the masterbatch from the raw materials through a strand pelletizer.

8. The preparation method according to claim 7, characterized in that: When using the strand pelletizer, control the temperature of zone 1 at 75~80℃, the temperature of zones 3 to 6 at 195~200℃, and the temperature of zone 7 at 185~190℃, and then extrude and pelletize.

9. A method for preparing a walnut-like polyolefin floor, comprising the first step of adjusting an initial flooring formula containing color powder to a conversion formula; and The second step is to prepare the material according to the conversion formula and then pass it through a wood plastic extruder and a mold to make a floor intermediate; and a third step of using a pattern roller engraved with walnut grain to engrave walnut grain on the floor intermediate; The conversion formula includes the following components in parts by mass: Wood flour 15~25% Masterbatch 4~6% POE 1~3% PE-g-MAH 1~3% Second internal lubricant 2~4% Second external lubricant 0.6~0.9% Second antioxidant 0.2~0.5% Second light stabilizer 0.2~0.5% The balance of the basic resin HDPE, the sum of each component meets 100%; The masterbatch is composed of the following raw materials in percentage by mass: Titanium dioxide 10~12% Carbon black 2.5~3.0% Iron oxide red 3.9~4.0% Iron oxide yellow 3.0~3.1% Phthalocyanine blue 0.5~0.6% Dispersant 1~2% Nano-silicon dioxide 5~8% First antioxidant 0.1~0.2% First light stabilizer 0.1~0.2% First internal lubricant 1~2% First external lubricant 0.2~0.3% The balance of resin carrier PE, the sum of each component meets 100%.

10. A method for preparing a walnut-like polyolefin floor, comprising the following steps: S1, use the main extruder to melt and plasticize the core layer raw material, and then extrude it into the main channel of the co-extrusion die; S2, using a first auxiliary extruder to melt and plasticize the first surface layer raw material into a first melt, and then extruding it into a first side flow channel of a co-extrusion die; S2, using a second auxiliary extruder to melt and plasticize the second surface layer raw material into a second melt, and then extruding it into the second side flow channel of the co-extrusion die; S3, co-extruding the core layer raw material, the first surface layer raw material, and the second surface layer raw material from the co-extrusion die to produce a floor intermediate in which a first surface layer with a thickness of 0.2 to 0.5 mm is coated with a second surface layer with a thickness of 1.0 to 2.0 mm, and the second surface layer coats the core layer; S4. solidifying the floor intermediate by cooling; S5. Heating the floor intermediate to soften the first surface layer and the second surface layer; S6. Using a pattern roller engraved with walnut wood grain, engrave walnut wood grain on both the first surface layer and the second surface layer to obtain an engraved intermediate; the engraving depth of the pattern roller exceeds the thickness of the first surface layer by at least 0.2 mm and does not exceed the thickness of the second surface layer; S7, grinding the engraved intermediate to remove at least 0.2 mm and no more than 0.3 mm of thickness to obtain the imitation walnut-colored polyolefin floor; The first surface layer material uses a first imitation walnut masterbatch, and the formula of the first imitation walnut masterbatch is as follows: Titanium dioxide 10% Carbon black 3.0% Iron oxide red 3.9~4.0% Iron oxide yellow 3.0~3.1% Phthalocyanine blue 0.5~0.6% Dispersant 0.5~1% Nano-silicon dioxide 5~10% First antioxidant 0.1~0.2% First light stabilizer 0.1~0.2% First internal lubricant 1~2% First external lubricant 0.1~0.2% The balance of resin carrier PE, the sum of each component meets 100%; The second surface layer material uses a second imitation walnut masterbatch, and the formula of the second imitation walnut masterbatch is as follows: Titanium dioxide 12% Carbon black 2.5% Iron oxide red 3.9~4.0% Iron oxide yellow 3.0~3.1% Phthalocyanine blue 0.5~0.6% Dispersant 0.5~1% Nano-silicon dioxide 5~10% First antioxidant 0.1~0.2% First light stabilizer 0.1~0.2% First internal lubricant 1~2% First external lubricant 0.1~0.2% The balance of resin carrier PE, the sum of each component meets 100%.