Wood-plastic double-layer double-color co-extrusion profile and preparation method thereof

Abstract

The application discloses a kind of wood-plastic double-layer double-color co-extrusion profiles and preparation method thereof, belong to plastic wood field.A kind of wood-plastic double-layer double-color co-extrusion profiles, including core layer base material and outer layer surface material, the outer layer surface material includes the following weight fraction components: high density polyethylene 40-60 parts, copolymer polypropylene 5-15 parts, Dupont sarin resin 15-25 parts, maleic anhydride grafted polyethylene wax 1-3 parts, organic silicon lubricant 1.5-2 parts, TPE elastomer 10-20 parts, reinforcing filler 15-25 parts, dust prevention aid 1-2 parts, light stabilizer 0.5-1 part and color powder 1-3 parts.And specific preparation method is disclosed.The method can improve the adhesion of surface layer wood-plastic and core layer wood-plastic, meanwhile, the size stability of profile is good.

Description

Technical Field

[0001] This invention relates to the field of wood-plastic composites, and more specifically, to a wood-plastic double-layer, double-color co-extruded profile and its preparation method. Background Technology

[0002] Wood-plastic composite (WPC) is a high-quality material that uses plastic to replace wood. It is made from nearly 100% recycled plastics and recycled wood flour, and boasts excellent performance and recyclability. WPC flooring is an important application area for WPC materials. However, traditional WPC materials offer limited color options, with only surface co-extrusion of colored plastics for two- or multi-color options, or requiring additional manpower and resources for material splicing. Researchers have developed two-color or double-layer co-extruded WPC flooring that combines the wood grain and texture of traditional WPC with richer colors and functionality. Current manufacturing processes involve thermoforming and water-cooling the core layer before applying the surface material. However, during use, it has been found that the adhesion between the surface and core layers of this double-layer WPC flooring is poor. After a period of use, the surface and inner layers shrink unevenly, and the end layers of the flooring are prone to gaps that absorb water and moisture. This results in high internal stress, poor adhesion, easy detachment, and a short lifespan. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a wood-plastic double-layer, double-color co-extruded profile and its preparation method. This method can improve the adhesion between the surface wood-plastic and the core wood-plastic, while the profile has good antibacterial properties, sun resistance, and dimensional stability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A wood-plastic composite double-layer, double-color co-extruded profile includes a core layer base material and an outer surface material, wherein the outer surface material comprises the following components in parts by weight:

[0006]

[0007]

[0008] In a further technical solution, the reinforcing filler is a composite of nano-ceramic powder and glass microsphere masterbatch with a mass ratio of 1:4.

[0009] The dust-proofing agent is one or more of ethoxylated aliphatic alkylamines, stearamides, and ultrafine silica;

[0010] The light stabilizer is one or more of benzophenones, benzotriazoles, and triazine compounds;

[0011] The pigment is one or more of iron oxide red, iron oxide yellow, phthalocyanine blue, ultramarine, carbon black, and titanium dioxide.

[0012] A further technical solution is that the core layer base material comprises the following components in parts by weight:

[0013]

[0014] A further technical solution is that the wood flour is a mixed wood flour with a mesh size of 40-100 mesh;

[0015] The polyolefin is one or more of the following: low-density polyethylene, linear low-density polyethylene, high-density polyethylene, homopolymer polypropylene, and copolymer polypropylene.

[0016] The reinforcing filler is selected from one or more of the following: talc powder of 500-1500 mesh, calcium carbonate, calcium silicate, glass microspheres, kaolin, alumina and magnesium oxide;

[0017] The lubricant is one or more of fatty acid salts and modified amides, stearic acid, EBS, butyl acetate, polyethylene wax, and organosilicon, with organosilicon lubricants being preferred;

[0018] The compatibilizer is one or more of maleic anhydride-grafted polyethylene wax, maleic anhydride-grafted polyethylene, and maleic anhydride-grafted polypropylene with ultra-high dispersion and high grafting rate.

[0019] The coupling agent is one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents;

[0020] Antioxidants are one or more of hindered phenols, aromatic amines, and phosphites, such as antioxidant 1010 (tetradecyl tetrakis[3-3',5'-di-tert-butyl-4'-hydroxyphenyl]propionate), antioxidant DLTDP (dilauryl thiodipropionate), and antioxidant DSTDP (distearate thiodipropionate).

[0021] A method for preparing a wood-plastic double-layer, double-color co-extruded profile includes the following steps:

[0022] Step 1): Mix 40-70 parts of wood flour, 25-40 parts of polyolefin, 5-20 parts of reinforcing filler, 2-4 parts of lubricant, 2-5 parts of compatibilizer, 2-5 parts of coupling agent, and 0.2-0.5 parts of antioxidant thoroughly using a high-speed mixer, and then granulate the mixture using a conical double granulator to obtain core layer wood plastic. The granulation temperature is 120℃-220℃.

[0023] Step 2): Combine 40-60 parts high-density polyethylene, 5-15 parts copolymer polypropylene, and 15-25 parts DuPont saline resin.

[0024] 1-3 parts of maleic anhydride grafted polyethylene wax, 1.5-2 parts of organosilicon lubricant, 10-20 parts of TPE elastomer, 15-25 parts of reinforcing filler, 1-2 parts of dustproofing agent, 0.5-1 parts of light stabilizer, and 1-3 parts of color powder are mixed at high speed in a high-speed mixer. After the materials are evenly dispersed, they are granulated by a flat double granulator to obtain surface wood plastic. The granulation temperature is 120-220℃.

[0025] Step 3): The obtained core layer wood-plastic is added to the hopper of the wood-plastic extrusion production equipment through an automatic feeder. The extrusion temperature is 120℃-220℃. The core layer wood-plastic is fed into the co-extrusion distributor at a temperature of 150-220℃. At the same time, the obtained surface layer wood-plastic is added to the feed port of the auxiliary equipment of the co-extrusion distributor at a temperature of 110℃-180℃. The surface layer wood-plastic is then applied to the surface of the core layer wood-plastic and fed into the mold together. The mold temperature is 110-210℃. The feeding speed of the wood-plastic extruder and the surface material auxiliary equipment are adjusted to 5-30 r / min. The double-layer, two-color co-extruded wood-plastic flooring is then formed.

[0026] Beneficial effects:

[0027] Compared with the prior art, the present invention has the following significant advantages:

[0028] 1. The outer surface material of the present invention uses high-density polyethylene and DuPont Salin resin as base materials, combined with maleic anhydride grafted polyethylene wax with high dispersion and ultra-high grafting rate. The combination of the three promotes better adhesion of the surface material, which can greatly improve the adhesion between the surface material and the core material and improve the service life of the profile.

[0029] 2. The outer surface material of this invention uses a composite of nano-ceramic powder and glass microspheres as a reinforcing filler, which significantly improves the antibacterial properties, water absorption dimensional shrinkage, and anti-aging properties of the material, thereby enhancing the material's dimensional stability.

[0030] 3. The outer surface material of the present invention uses an organosilicon lubricant, which has a good lubrication effect and does not cause grease precipitation. It will not form a grease layer between the surface material and the core material, thus making the adhesion between the surface material and the core material better.

[0031] 4. Compared with the traditional thermoforming, water-cooling, and then heat-applying surface layer processing method, the preparation method of the present invention adopts hot-melt and hot-extrusion molding process. The prepared material has low internal stress and the surface material and core material are well integrated, which can greatly improve the adhesion and peel resistance of the material. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments.

[0033] Example

[0034] A wood-plastic composite double-layer, double-color co-extruded profile includes a core layer base material and an outer surface material, wherein the outer surface material comprises the following components in parts by weight:

[0035]

[0036] The reinforcing filler is a compound of nano-ceramic powder and glass microsphere masterbatch with a mass ratio of 1:4.

[0037] The dust-proofing agent is one or more of ethoxylated aliphatic alkylamines, stearamides, and ultrafine silica;

[0038] The pigment is one or more of iron oxide red, iron oxide yellow, phthalocyanine blue, ultramarine, carbon black, and titanium dioxide.

[0039] The light stabilizer is one or more of benzophenone, benzotriazole, and triazine compounds; such as light stabilizer 791 and light stabilizer 783.

[0040] The core layer base material comprises the following components in parts by weight:

[0041]

[0042]

[0043] In the core layer base material, the wood flour is a mixed wood flour with a mesh size of 40-100.

[0044] The polyolefin is one or more of the following: low-density polyethylene, linear low-density polyethylene, high-density polyethylene, homopolymer polypropylene, and copolymer polypropylene.

[0045] The reinforcing filler is selected from one or more of the following: talc powder of 500-1500 mesh, calcium carbonate, calcium silicate, glass microspheres, kaolin, alumina and magnesium oxide;

[0046] The lubricant is one or more of fatty acid salts and modified amides, stearic acid, EBS, butyl acetate, polyethylene wax, and organosilicon, with organosilicon lubricants being preferred;

[0047] The compatibilizer is one or more of maleic anhydride-grafted polyethylene wax, maleic anhydride-grafted polyethylene, and maleic anhydride-grafted polypropylene with ultra-high dispersion and high grafting rate.

[0048] The coupling agent is one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents;

[0049] The antioxidant is one or more of hindered phenols, aromatic amines, and phosphites.

[0050] The preparation method of the above-mentioned wood-plastic double-layer, double-color co-extruded profile includes the following steps:

[0051] Step 1): Mix 40-70 parts of wood flour, 25-40 parts of polyolefin, 5-20 parts of reinforcing filler, 2-4 parts of lubricant, 2-5 parts of compatibilizer, 2-5 parts of coupling agent, and 0.2-0.5 parts of antioxidant thoroughly using a high-speed mixer, and then granulate the mixture using a conical double granulator to obtain core layer wood plastic. The granulation temperature is 120℃-220℃.

[0052] Step 2): Combine 40-60 parts high-density polyethylene, 5-15 parts copolymer polypropylene, and 15-25 parts DuPont saline resin.

[0053] Maleic anhydride-grafted polyethylene wax 1-3 parts, silicone lubricant 1.5-2 parts, TPE elastomer 10-20 parts

[0054] 15-25 parts of reinforcing filler, 1-2 parts of dustproofing agent, 0.5-1 parts of light stabilizer and 1-3 parts of color powder are mixed at high speed in a high-speed mixer. After the materials are evenly dispersed, they are granulated by a flat double granulator to obtain surface wood plastic. The granulation temperature is 120-220℃.

[0055] Step 3): The obtained core layer wood-plastic is added to the hopper of the wood-plastic extrusion production equipment through an automatic feeder. The extrusion temperature is 120℃-220℃. The core layer wood-plastic is fed into the co-extrusion distributor at a temperature of 150-220℃. At the same time, the obtained surface layer wood-plastic is added to the feed port of the auxiliary equipment of the co-extrusion distributor at a temperature of 110℃-180℃. The surface layer wood-plastic is then applied to the surface of the core layer wood-plastic and fed into the mold together. The mold temperature is 110-210℃. The feeding speed of the wood-plastic extruder and the surface material auxiliary equipment are adjusted to 5-30 r / min. The double-layer, two-color co-extruded wood-plastic flooring is then formed.

[0056] Based on the above preparation method, the specific formulations of the comparative examples and embodiments are as follows:

[0057]

[0058]

[0059] The comparative examples and embodiments in the table above were tested, and the performance results are shown in the table below:

[0060] Performance table of comparative examples and embodiments of the products of this invention

[0061]

[0062]

[0063] As can be seen from the data in Example 4 and Comparative Examples 1-3 above, when DuPont sarin resin and maleic anhydride-grafted polyethylene wax are added to the material simultaneously, the bonding strength of the profile is significantly improved compared to adding only DuPont sarin resin or maleic anhydride-grafted polyethylene wax. This indicates that DuPont sarin resin and maleic anhydride-grafted polyethylene wax can work synergistically to improve the adhesion between the surface layer and the core layer. Furthermore, combined with the data from Examples 3-4, it can be seen that increasing the content of maleic anhydride-grafted polyethylene wax can improve the adhesion of the material. The data from Example 4 and Comparative Example 4 show that, in Comparative Example 4, the lack of reinforcing filler leads to an increase in the proportion of sarin and maleic anhydride grafts, resulting in increased viscosity and bonding strength. However, the color fastness deteriorates, the water absorption dimensional change rate increases, and the fungal corrosion area expands. This indicates that adding reinforcing filler to the surface material improves the color fastness, thus enhancing the profile's sun resistance and dimensional stability. The data from Example 4, Comparative Example 5, and Comparative Example 6 in the table above show that the use of a composite of nano-ceramic powder and glass microsphere masterbatch as reinforcing filler significantly improves the sun resistance and dimensional stability compared to using nano-ceramic powder or glass microsphere masterbatch alone.

Claims

1. A wood-plastic composite double-layer, double-color co-extruded profile, comprising a core layer base material and an outer surface material, characterized in that: The outer surface material comprises the following components in parts by weight: 40-60 parts of high-density polyethylene 5-15 parts of copolymerized polypropylene 15-25 parts of DuPont saline resin 1-3 parts of maleic anhydride-grafted polyethylene wax 1.5-2 parts of silicone lubricant 10-20 parts of TPE elastomer 15-25 parts of reinforcing filler 1-2 parts of dustproof additive Light stabilizer 0.5-1 part 1-3 parts of color powder; The reinforcing filler is a composite of nano-ceramic powder and glass microsphere masterbatch with a mass ratio of 1:

4.

2. The wood-plastic double-layer, double-color co-extruded profile according to claim 1, characterized in that: The dust-proofing agent is one or more of ethoxylated aliphatic alkylamines, stearamides, and ultrafine silica; The light stabilizer is one or more of benzophenones, benzotriazoles, and triazine compounds; The pigment is one or more of iron oxide red, iron oxide yellow, phthalocyanine blue, ultramarine, carbon black, and titanium dioxide.

3. The wood-plastic double-layer, double-color co-extruded profile according to claim 1, characterized in that: The core layer base material comprises the following components in parts by weight: 40-70 parts wood flour 25-40 parts of polyolefin 5-20 parts of reinforcing filler 2-4 parts lubricant 2-5 parts compatibilizer 2-5 parts of coupling agent Antioxidant 0.2-0.5 parts.

4. The wood-plastic double-layer, double-color co-extruded profile according to claim 3, characterized in that: The wood flour mentioned is a mixed wood flour with a mesh size of 40-100 mesh; The polyolefin is one or more of the following: low-density polyethylene, linear low-density polyethylene, high-density polyethylene, homopolymer polypropylene, and copolymer polypropylene. The reinforcing filler is selected from one or more of the following: talc powder (500-1500 mesh), calcium carbonate, calcium silicate, glass microspheres, kaolin, alumina, and magnesium oxide. The lubricant is one or more of the following: fatty acid salts and modified amides, stearic acid, EBS, polyethylene wax, and organosilicon. The compatibilizer is one or more of maleic anhydride-grafted polyethylene wax, maleic anhydride-grafted polyethylene, and maleic anhydride-grafted polypropylene. The coupling agent is one or more of silane coupling agents, titanate coupling agents, and aluminate coupling agents; The antioxidant is one or more of hindered phenols, aromatic amines, and phosphites.

5. The wood-plastic double-layer, double-color co-extruded profile according to claim 4, characterized in that: The lubricant mentioned is an organosilicon lubricant.

6. A method for preparing a wood-plastic double-layer, double-color co-extruded profile, characterized in that: Includes the following steps: Step 1): 40-70 parts of wood flour, 25-40 parts of polyolefin, 5-20 parts of reinforcing filler, 2-4 parts of lubricant, 2-5 parts of compatibilizer, 2-5 parts of coupling agent, and 0.2-0.5 parts of antioxidant are thoroughly mixed in a high-speed mixer, and then granulated in a cone-shaped double granulator to obtain core layer wood plastic. The granulation temperature is 120℃-220℃. Step 2): 40-60 parts of high-density polyethylene, 5-15 parts of copolymer polypropylene, 15-25 parts of DuPont saline resin, 1-3 parts of maleic anhydride grafted polyethylene wax, 1.5-2 parts of silicone lubricant, 10-20 parts of TPE elastomer, 15-25 parts of reinforcing filler, 1-2 parts of dust-proofing agent, 0.5-1 parts of light stabilizer, and 1-3 parts of color powder are mixed at high speed in a high-speed mixer. After the materials are evenly dispersed, they are granulated using a flat double granulator to obtain surface wood-plastic composite. The granulation temperature is 120-220℃. The reinforcing filler is a compound of nano-ceramic powder and glass microsphere masterbatch in a mass ratio of 1:

4. Step 3): The obtained core layer wood-plastic is added to the hopper of the wood-plastic extrusion production equipment through an automatic feeder. The extrusion temperature is 120℃-220℃. The core layer wood-plastic is fed into the co-extrusion distributor at a temperature of 150-220℃. At the same time, the obtained surface layer wood-plastic is added to the feed port of the auxiliary equipment of the co-extrusion distributor at a temperature of 110℃-180℃. This allows the surface layer wood-plastic to be applied to the surface of the core layer wood-plastic. Both layers are then fed into the mold at a processing temperature of 110-210℃. The feeding speed of the wood-plastic extruder and the surface material auxiliary equipment are adjusted to 5-30 r / min. The resulting double-layer, two-color co-extruded wood-plastic flooring is formed.

Images