CN114031832A - Surface layer material for wood-plastic section and preparation method of wood-plastic section composite material with surface layer material - Google Patents
Surface layer material for wood-plastic section and preparation method of wood-plastic section composite material with surface layer material Download PDFInfo
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- CN114031832A CN114031832A CN202111289069.7A CN202111289069A CN114031832A CN 114031832 A CN114031832 A CN 114031832A CN 202111289069 A CN202111289069 A CN 202111289069A CN 114031832 A CN114031832 A CN 114031832A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/068—Ultra high molecular weight polyethylene
Abstract
The invention relates to the technical field of wood-plastic profiles and discloses a surface layer material for a wood-plastic profile and a preparation method of a wood-plastic profile composite material with the surface layer material, wherein the surface layer material for the wood-plastic profile comprises the following raw materials in parts by weight: 65-90 parts of HDPE, 3-5 parts of polyethylene copolymer, 5-15 parts of UHMWPE, 1-5 parts of tackifier, 1-5 parts of compatilizer, 3-10 parts of filler, 0.1-0.5 part of antioxidant, 0.1-1 part of mildew preventive and 0.1-0.5 part of ultraviolet-resistant absorbent; the melt index of HDPE at 190 deg.C under 5kg load is 0.02-1g/10 min; the relative molecular mass of the UHMWPE is 200-600 ten thousand; the preparation method of the wood-plastic profile composite material comprises the following steps: uniformly mixing the raw materials of the surface layer material for the wood-plastic section, and then carrying out melt extrusion, circular cutting and grain cutting; respectively melting and extruding the surface layer materials for the wood-plastic section bar core layer and the wood-plastic section bar into a core body cavity and a surface layer cavity of a co-extrusion die, continuously melting and extruding, cooling and precutting; the surface layer material for the wood-plastic section has the advantage of good anti-stripping performance.
Description
Technical Field
The invention relates to the technical field of wood-plastic profiles, in particular to a surface layer material for a wood-plastic profile and a preparation method of a wood-plastic profile composite material with the surface layer material.
Background
The wood-plastic section is a material obtained by taking raw materials such as regenerated plastics or plastic new materials, wood powder and the like as main raw materials through the steps of granulation, extrusion molding and the like, and is widely applied to the field of building decoration.
The surface layer material for the wood-plastic profile is a protective material and is generally coated on the surface of the wood-plastic profile by a co-extrusion technology, so that the wood-plastic profile is protected, and the performances of oxidation resistance, ultraviolet resistance and the like of the wood-plastic profile composite material are improved. At present, the main raw materials of the surface layer material comprise high-density polyethylene, surlyn resin, an anti-aging agent, a color master batch and the like, and part of the surface layer material is immersed into the wood-plastic section core layer, so that the interfacial diffusion capacity is improved, the bonding force is enhanced, and the bonding of the wood-plastic section core layer and the surface layer material is realized.
With the above-mentioned related art, the diffusibility of the surface layer material prepared from the above-mentioned raw materials is generally liable to cause a phenomenon that the surface layer material is detached from the surface of the wood-plastic section when an external force such as cutting is applied to the wood-plastic section coated with the surface layer material.
Disclosure of Invention
In order to improve the anti-stripping performance of the wood-plastic profile composite material, the application provides a surface layer material for a wood-plastic profile and a preparation method thereof.
In a first aspect, the present application provides a surface layer material for a wood-plastic profile, which adopts the following technical scheme:
a surface layer material for a wood-plastic profile comprises the following raw materials in parts by weight:
65-90 parts of HDPE;
3-5 parts of polyethylene copolymer;
5-15 parts of UHMWPE;
1-5 parts of a compatilizer;
1-5 parts of a tackifier;
3-10 parts of a filling agent;
0.1-0.5 part of antioxidant;
0.1-1 part of mildew preventive;
0.1-0.5 part of anti-ultraviolet absorbent;
the melt index of the HDPE is 0.02-1g/10min under the conditions of the temperature of 190 ℃ and the load of 5 kg; the relative molecular mass of the UHMWPE is 200-600 ten thousand.
By adopting the technical scheme, HDPE is adopted as the base resin and matched with the polyethylene copolymer, and the HDPE and the wood-plastic section sandwich layer have good compatibility, so that the surface layer material for the wood-plastic section is easier to diffuse into the wood-plastic section sandwich layer, and the stripping resistance of the surface layer material for the wood-plastic section is improved. The added UHMWPE and HDPE have similar structures, so that the mechanical property of the surface layer material of the wood-plastic section can be improved, and the wear resistance is improved. The melt index of HDPE is optimized, so that the HDPE is endowed with better fluidity and the mechanical property of the HDPE is ensured; the relative molecular mass of the UHMWPE is optimized, so that the HDPE, the UHMWPE and the polyethylene copolymer are better matched, the viscosity of the surface layer material for the wood-plastic section and the wood-plastic section is further enhanced, and the anti-stripping performance of the surface layer material for the wood-plastic section is improved. And substances such as a compatilizer, a tackifier and the like are added, so that the stripping resistance of the surface layer material for the wood-plastic section is further enhanced, and the weather resistance and the wear resistance of the surface layer material are improved. The antioxidant can be at least one of antioxidant 1010 or antioxidant 1076; the ultraviolet absorber may be at least one of UV325, UV326, UV328, UV53, UV3346 to further enhance the weather resistance of the wood-plastic profile composite.
In conclusion, the HDPE, the UHMWPE and the polyethylene copolymer are matched together, the surface layer material for the obtained wood-plastic section has good compatibility with the core layer of the wood-plastic section, and the compatilizer and the tackifier are added for matching together, so that the formed wood-plastic section composite material has good anti-stripping performance and high strength.
Preferably, the compatibilizer comprises at least one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, and maleic anhydride grafted EVA.
By adopting the technical scheme, the components are preferably used as compatilizers, so that the adhesive property is excellent, the components are better matched with HDPE, UHMWPE and polyethylene copolymer, and the stripping resistance between the surface layer material of the wood-plastic profile and the core layer of the wood-plastic profile is further enhanced.
Preferably, the HDPE has a melt index of 0.05-1g/10min at 190 ℃ and under a load of 5 kg; the relative molecular mass of the UHMWPE is 300-500 ten thousand.
By adopting the technical scheme, the melt index of HDPE and the relative molecular mass of UHMWPE are optimized, so that HDPE, UHMWPE and polyethylene copolymer are better matched, the flow property is improved, the viscosity of a surface layer material and a wood-plastic section core layer of the wood-plastic section is further enhanced, and the anti-stripping property of the wood-plastic section composite material is improved.
Preferably, the tackifier comprises at least one of polyisobutylene, rosin, hydrogenated rosin ester, petroleum resin, and terpene resin.
By adopting the technical scheme, after the components of the tackifier are optimized, the tackifier is matched with the polyethylene copolymer, so that the small molecular polymer and the medium molecular polymer are easier to diffuse into the wood-plastic section core layer, a larger transition area is formed, and the stripping resistance between the surface layer material for the wood-plastic section and the wood-plastic section core layer is further enhanced.
Preferably, the polyethylene copolymer comprises at least one of ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene butyl acrylate copolymer and ethylene-propylene-1-butene polymer.
By adopting the technical scheme, the preferable polyethylene copolymer component has better compatibility with HDPE, the melt of the polyethylene copolymer component has higher viscosity, and the molten polyethylene copolymer can be diffused into the wood-plastic section bar core layer to form a transition region, so that the polyethylene copolymer component and the core layer can penetrate through each other and are combined in an interweaving way, and further the stripping resistance of the surface layer material of the wood-plastic section bar is improved.
Preferably, the raw materials of the surface layer material for the wood-plastic profile further comprise 5-10 parts by weight of a polyethylene-based elastomer.
By adopting the technical scheme, the expansion rates of the core layer and the surface layer of the wood-plastic profile body are different, the surface layer is easy to separate due to the change of temperature, and the surface layer is separated from the wood-plastic profile due to the addition of the polyethylene elastomer, so that the phenomenon that the surface layer is separated from the wood-plastic profile due to the cold and heat circulation is reduced, and the surface layer for the wood-plastic profile is endowed with better anti-stripping capability; meanwhile, after the polyethylene elastomer is added, the polyethylene elastomer is matched with substances such as HDPE and the like, so that the elasticity and toughness of the surface layer material for the wood-plastic section are enhanced, and the wood-plastic section is further protected.
Preferably, the polyethylene-based elastomer comprises at least one of POE, TPO, and EVA.
By adopting the technical scheme, the specific components of the polyethylene-based elastomer are preferably selected, the problem that the surface layer material for the wood-plastic profile is separated from the core layer of the wood-plastic profile due to cold and hot circulation is better reduced, and the anti-stripping performance of the surface layer material for the wood-plastic profile is further enhanced.
Preferably, the filler includes at least one of hollow glass beads, talc powder, and fumed silica.
By adopting the technical scheme, the components of the filler are preferably selected and are filled in the surface layer material for the wood-plastic profile in a small amount, so that the wear resistance and the strength of the surface layer material for the wood-plastic profile are effectively enhanced.
In a first aspect, the application provides a method for preparing a wood-plastic profile composite material, which adopts the following technical scheme: a preparation method of a wood-plastic profile composite material comprises the following preparation steps of, by weight, 5-15% of a surface layer material for the wood-plastic profile and the balance of a wood-plastic profile core layer:
s1, mixing HDPE, polyethylene copolymer, UHMWPE and polyethylene elastomer, adding tackifier, compatilizer, filler, antioxidant, mildew preventive and ultraviolet resistant absorbent after mixing uniformly, mixing uniformly to obtain a first mixture;
s2, performing melt extrusion on the first mixture, wherein the melt extrusion temperature is 100-190 ℃; then, obtaining the surface layer material for the wood-plastic section after circular cutting and grain cutting;
s3, respectively melting and extruding the surface layer materials of the wood-plastic section bar core layer and the wood-plastic section bar into a core body cavity and a surface layer cavity of a co-extrusion die, continuously melting and extruding, cooling and pre-cutting to obtain a wood-plastic section bar composite material semi-finished product;
the melt extrusion temperature of the wood-plastic profile core layer is 140-230 ℃;
the melting extrusion temperature of the surface layer material of the wood-plastic profile is 145-225 ℃;
and S4, polishing and cutting the semi-finished product of the wood-plastic profile composite material to obtain the wood-plastic profile composite material.
By adopting the technical scheme, firstly, the surface layer material for the wood-plastic section is prepared; then the wood-plastic profile core layer and the wood-plastic profile core layer are melted together and extruded into a co-extrusion die, and then the wood-plastic profile composite material is obtained through steps of shaping and the like. By optimizing the temperature during melt extrusion, the surface layer material for the wood-plastic profile and the core layer of the wood-plastic profile are better fused, and the stripping resistance of the surface layer material for the wood-plastic profile is further enhanced.
Preferably, in the step S3, the melt extrusion temperature of the surface layer material for the wood plastic profile in the mold is 160-200 ℃.
By adopting the technical scheme, if the temperature is too low, the forming is not easy to occur, and if the temperature is too high, the strength of the surface layer material for the wood-plastic section is easy to reduce. The melt extrusion temperature of the surface layer material is optimized, so that the surface layer material for the wood-plastic profile is better extruded, the influence of phenomena such as air holes on the performance of the surface layer material is reduced, and the strength of the wood-plastic profile composite material is improved; on the other hand, the surface layer material for the wood-plastic profile and the core layer of the wood-plastic profile are better fused, and the anti-stripping performance of the surface layer material for the wood-plastic profile is further enhanced.
In summary, the present application has the following beneficial effects:
1. in the application, HDPE is used as a base resin, is matched with polyethylene copolymer and UHMWPE, has good compatibility with a wood-plastic section core layer, and is effectively diffused into the wood-plastic section core layer, so that a large transition region is formed, and the stripping resistance of a surface layer material for the wood-plastic section is enhanced.
2. In the application, specific components of the polyethylene copolymer and the tackifier are preferably selected, so that the diffusion capacity of the surface layer material is further improved, and the anti-stripping performance of the surface layer material for the wood-plastic section is further enhanced; the polyvinyl elastomer is added, so that the phenomenon that the surface layer material for the wood-plastic section is separated from the wood-plastic section due to cold and hot circulation is reduced, the elasticity and toughness of the surface layer material for the wood-plastic section are enhanced, and the wood-plastic section is further protected.
3. According to the preparation method of the wood-plastic profile composite material, the temperature of melt extrusion in each step is optimized, the anti-stripping performance of the surface layer material of the wood-plastic profile is improved, the generation of bubbles is reduced, and the quality of the wood-plastic profile composite material is improved.
Detailed Description
The present application is described in further detail below.
The components and manufacturers in the examples are shown in Table 1.
TABLE 1 Components and manufacturers
Preparation example
Preparation example 1A core layer of a wood-plastic profile was prepared by the following steps:
a. drying the wood powder at 175 ℃ to ensure that the water content is about 7 percent and the ash content is 3 percent and 40 meshes;
b. weighing raw materials, wherein the weight of wood powder is 66kg, the weight of HDPE is 30kg, the weight of lubricant is 3kg, and the weight of toner is 1 kg; then uniformly mixing the raw materials, and transferring the mixture into a hopper of a 95 parallel double-screw extruder;
c. and (2) granulating, namely extruding the raw materials by a 95 parallel double-screw extruder, enabling the temperature of each zone of a machine barrel to be below 190 ℃, conveying, shearing, re-conveying and re-shearing all sections of the extruder to enable the materials to be in a molten state, feeding the materials into a granulator head, extruding blocky materials by high pressure, crushing the materials into particles of 2-3mm by a crusher, and cooling the particles to be below 30 ℃ by an air-assisted cooling system to obtain the wood-plastic section core layer.
Examples
Example 1A skin material for a wood-plastic profile, comprising the specific components and weights shown in Table 2, was prepared by the following steps:
s1, mixing HDPE, polyethylene copolymer and UHMWPE, adding tackifier, compatilizer, filler, antioxidant, mildew preventive and ultraviolet resistant absorbent after mixing uniformly, mixing and stirring at the stirring speed of 300r/min for 30min to obtain a first mixture;
and S2, performing melt extrusion on the first mixture, wherein the temperatures of the first zone to the fifth zone in the melt extrusion process are respectively as follows: 100 ℃, 160 ℃, 165 ℃, 170 ℃, 170 ℃; and performing circular cutting, water cooling, air drying and drying to obtain the surface layer material with the diameter of 3.5 +/-1.5 mm for the wood-plastic section. Wherein the melt index of HDPE is 0.02g/10min at the temperature of 190 ℃ and under the load of 5 kg; the relative molecular mass of UHMWPE is 600 ten thousand.
Example 2 a skin material for a wood-plastic profile, which is different from example 1 in that the temperatures of one zone to five zones during melt extrusion are respectively: 110 ℃, 180 ℃, 185 ℃, 190 ℃ and 190 ℃; meanwhile, the components and the weight are different, and the melt index of HDPE at the temperature of 190 ℃ and under the load of 5kg is 0.1g/10 min; the relative molecular mass of UHMWPE is 200 ten thousand; the specific components and weights included are shown in table 2.
Examples 3 to 5 a skin material for a wood-plastic profile, which is different from example 1 in the specific components of the compatibilizer, and the specific components and weights thereof are shown in table 2.
Example 6A skin material for a wood-plastic profile, which is different from example 5 in that HDPE has a melt index of 0.1g/10min at 190 ℃ under a load of 5 kg; the relative molecular mass of UHMWPE is 350 ten thousand.
Example 7A skin material for a wood-plastic profile, which is different from example 6 in that HDPE has a melt index of 0.05g/10min at 190 ℃ under a load of 5 kg; the relative molecular mass of UHMWPE is 300 ten thousand.
Example 8A skin material for a wood-plastic profile, which is different from example 6 in that HDPE has a melt index of 0.075g/10min at 190 ℃ under a load of 5 kg; the relative molecular mass of UHMWPE is 400 ten thousand.
Examples 9 to 10A skin material for a wood-plastic profile, which is different from example 8 in the composition of the tackifier, was comprised as specified in Table 2.
Examples 11 to 13A skin material for a wood-plastic composite material, which is different from example 10 in the components of the polyethylene copolymer, was prepared by the following steps, and the specific components and weights thereof are shown in Table 2.
TABLE 2 Components and weights of examples 1-5 and examples 9-13
Examples 14 to 15 a skin material for wood-plastic profiles, which is different from example 13 in that a polyethylene-based elastomer was added in step S1, and the specific components and weights thereof were as shown in table 3.
Examples 16 to 17A skin material for a wood-plastic composite material was prepared in the same manner as in example 14 except that the polyethylene-based elastomer was composed in different amounts, and the specific components and weights thereof were as shown in Table 3.
Examples 18 to 19A skin material for a wood-plastic composite material, which is different from example 17 in the specific components of the filler, was prepared as shown in Table 3.
Examples 20 to 21A skin material for a wood-plastic composite material, which is different from example 19 in that HDPE has a melt index of 0.075g/10min at 190 ℃ under a load of 5 kg; the relative molecular mass of UHMWPE is 400 ten thousand, the components and weights are different, and the specific components and weights included are shown in table 3.
TABLE 3 Components and weights of examples 14-21
Embodiment 22 a wood-plastic profile composite comprising the following preparation steps:
s3, melting and extruding the surface layer material of the wood-plastic profile in the embodiment 1 and the core layer of the wood-plastic profile in the preparation example 1 into a core body cavity and a surface layer cavity of a co-extrusion die; the weight ratio of the surface layer material of the wood-plastic section to the wood-plastic section is 15: 85; wherein the speed of the melt extrusion of the wood-plastic profile core layer is 1m/min, and the melt extrusion temperature is divided into the following areas: 230 ℃ in the first zone, 230 ℃ in the second zone, 180 ℃ in the third zone, 180 ℃ in the fourth zone and 180 ℃ in the fifth zone. The melt extrusion temperature of the surface layer material for the wood-plastic profile is as follows: 160 ℃ in the first zone, 150 ℃ in the second zone, 220 ℃ in the third zone, 220 ℃ in the fourth zone and 220 ℃ in the fifth zone.
S4, continuously melting and extruding the wood-plastic section core layer and the surface layer material of the wood-plastic section wrapped outside the wood-plastic section in the mould, cooling after melting and extruding, and precutting to form a semi-finished product of the wood-plastic section composite material; the melt extrusion temperature in the wood-plastic profile core layer die is 150 ℃; the melt extrusion temperature in the skin material die for the wood-plastic profile was 210 ℃.
S5, embossing, shaping, precutting, cooling at room temperature (generally 25 +/-1 ℃) for 24 hours, polishing and cutting the semi-finished product of the wood-plastic profile composite material of the extruded outlet die to obtain the wood-plastic profile composite material.
Example 23 a wood-plastic profile composite material, different from example 22 in that, in step S3, the weight ratio of the skin material of the wood-plastic profile to the core layer of the wood-plastic profile is 5:95, and the melt extrusion temperature of the core layer of the wood-plastic profile in each zone is: 175 ℃ in the first zone, 160 ℃ in the second zone, 145 ℃ in the third zone, 140 ℃ in the fourth zone and 140 ℃ in the fifth zone. The melt extrusion temperature of the surface layer material for the wood-plastic profile is as follows:
145 ℃ in the first area, 225 ℃ in the second area, 225 ℃ in the third area, 200 ℃ in the fourth area and 200 ℃ in the fifth area;
in the step S4, the extrusion temperature of the wood-plastic profile in the molten core layer die is 150 ℃; the melt extrusion temperature in the skin material die for the wood-plastic profile was 155 ℃.
Examples 24-43 a wood-plastic composite material was distinguished from example 22 in that the same amounts of examples 2-21 were used instead of example 1, and examples 24-43 corresponded to examples 2-19, respectively, in this order.
Example 44A wood plastic profile composite material, which is different from example 43 in that the melt extrusion temperature of the skin material for a wood plastic profile in a die is 160 ℃ in step S4.
Example 45A wood-plastic composite material is different from example 43 in that the melt extrusion temperature of the skin material for a wood-plastic profile in a die is 200 ℃ in step S4.
Example 46A wood plastic profile composite material, different from example 43, in that the melt extrusion temperature of the skin material for a wood plastic profile in a die at step S4 was 180 ℃.
Comparative example
Comparative example 1 a skin material for a wood-plastic profile, which is different from example 1 in that it does not contain a polyethylene copolymer.
Comparative example 2 a skin material for a wood-plastic profile, which is different from example 1 in that UHMWPE is not contained.
Comparative example 3 a skin material for a wood-plastic profile, which is different from example 1 in that it does not contain the polyethylene copolymer and UHMWPE.
Comparative example 4 a skin material for a wood-plastic profile, which is different from example 1 in that HDPE has a melt index of 0.01g/10min at 190 ℃ under a load of 5 kg.
Comparative example 5A skin material for a wood-plastic profile, which is different from example 1 in that HDPE has a melt index of 1.1g/10min at a temperature of 190 ℃ and a load of 5 kg.
Comparative example 6 a skin material for a wood-plastic profile, which is different from example 1 in that UHMWPE has a relative molecular mass of 700 ten thousand.
Comparative example 7 a skin material for a wood-plastic profile, which is different from example 1 in that UHMWPE has a relative molecular mass of 200 ten thousand.
And in the comparative example 8, 60kg of thermoplastic elastomer thermoplastic polyurethane, 12kg of wear-resistant agent zinc oxide, 6kg of bonding modifier polypropylene-tetrafluoroethylene-maleic anhydride, 3kg of co-binder rosin resin, 0.1kg of hindered amine antioxidant and 0.4kg of pigment iron oxide yellow are added into a high-speed mixer, are uniformly mixed by the high-speed mixer and then are added into a parallel double-screw extruder for extrusion and granulation, and the length-diameter ratio of the parallel double-screw extruder is 48: 1, the processing temperature is 190 ℃.
Comparative example 9 a wood-plastic composite material is different from example 22 in that the same amount of the surface layer material for the wood-plastic profile of comparative example 1 is used instead of example 1.
Comparative examples 10 to 16 a wood-plastic composite material, which is different from example 22 in that the same amount of the surface layer material for the wood-plastic profiles of comparative examples 2 to 8 was used instead of example 1, respectively; comparative examples 10 to 16 correspond to comparative examples 2 to 8, respectively.
Detection method
Experiment one: peel strength test
Experimental samples: examples 22-46 and comparative examples 9-16.
The experimental method comprises the following steps: examples 22 to 46 and comparative examples 9 to 16 were examined with reference to the examination method in "measurement of tensile strength perpendicular to plate plane of wood chip board and fiber board" EN319:1993, and peel strengths of examples 22 to 46 and comparative examples 9 to 16 were obtained, respectively.
The experimental results are as follows: the experimental results of examples 22 to 46 and comparative examples 9 to 16 are shown in Table 4.
Experiment two: experiment of abrasion resistance
Experimental samples: examples 22-46 and comparative examples 9-16.
An experimental instrument: taber abrasion tester.
The experimental method comprises the following steps: abrasion resistance indexes the abrasion resistance indexes of examples 22 to 46 and comparative examples 9 to 16 were obtained by testing examples 22 to 46 and comparative examples 9 to 16, respectively, according to ASTM D4060 to 14, Standard test method for measuring abrasion resistance of organic coating by Taber abrasion tester.
The experimental results are as follows: the experimental results of examples 22 to 46 and comparative examples 9 to 16 are shown in Table 4.
Experiment three: weather resistance test
Experimental samples: examples 22-46 and comparative examples 9-16.
An experimental instrument: UVA-340nm ultraviolet lamp tube.
The experimental method comprises the following steps: the weather resistance series is obtained by testing according to the rule of cycle 1 in a plastic laboratory light source exposure method of ISO 4892-2:2013 and irradiating for 200 hours by ultraviolet rays with UVA-340 nm. Thus, the weathering performance of examples 22 to 46 and comparative examples 9 to 16 were obtained, respectively.
The experimental results are as follows: the experimental results of examples 22 to 46 and comparative examples 9 to 16 are shown in Table 4.
Experiment four: bending Strength test
Experimental samples: examples 22-46 and comparative examples 9-16.
An experimental instrument: prosite 137 glass cover 2589 four-bar static pressure 7365 tester.
The experimental method comprises the following steps: flexural properties the flexural strengths of examples 22-46 and comparative examples 9-16 were tested according to the experimental method in ASTM D6109-2010 Standard test for flexural Properties of non-reinforced and reinforced Plastic Wood and related articles to obtain flexural strengths of examples 22-46 and comparative examples 9-16, respectively.
The experimental results are as follows: the experimental results of examples 22 to 46 and comparative examples 9 to 16 are shown in Table 4.
TABLE 4 Experimental results for examples 22-46 and comparative examples 9-16
As is apparent from the table data in Table 4, the peel strengths of examples 22 to 46 were 3.42 to 3.77N/mm2The abrasion resistance index is 36.8-40.0mg, the weather resistance level is 4-5 and 5, and the bending strength is 29.9-32.3 MPa; comparative examples 9 to 16 had peel strengths of 1.59 to 2.71N/mm2The abrasion resistance index is 42.7-49.3mg, the weather resistance is 4 and 4-5, and the bending strength is 21.2-28.1 MPa. Examples 22-46 have better peel resistance and weather and abrasion resistance than comparative examples 9-16.
Comparing example 22 with comparative examples 9 to 11, it can be seen that the peel strength of the wood-plastic composite material is improved by adding the polyethylene copolymer and the UHMWPE, indicating that the peel resistance of the wood-plastic composite material can be enhanced by the cooperation of the polyethylene copolymer and the UHMWPE. Probably because the polyethylene copolymer, the UHMWPE and the HDPE have better compatibility, and have higher viscosity when being subjected to melt extrusion, the melt state can be diffused to the wood-plastic section core layer to form a transition layer, and the anti-stripping performance of the wood-plastic section composite material is enhanced.
Comparing example 22 with comparative examples 12-15, it can be seen that the melt index of HDPE and the relative molecular mass of UHMWPE are preferred to better match with HDPE and further enhance the anti-peeling performance of the wood-plastic profile composite.
Comparing example 22 with examples 25-27, it can be seen that, after the compatibilizer component is preferably selected, the peeling resistance of the wood-plastic composite material is enhanced, the bending strength is improved, and the wear resistance is enhanced, which indicates that maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, and maleic anhydride grafted EVA are preferably used as the compatibilizer to effectively enhance the peeling resistance of the wood-plastic composite material;
in comparison with examples 27 to 30, the melt index of HDPE and the relative molecular weight of UHMWPE are preferred again, and then the viscosity of the surface layer material for the wood-plastic profile and the viscosity of the core layer of the wood-plastic profile are further increased, so that the anti-peeling performance of the surface layer material for the wood-plastic profile and the core layer of the wood-plastic profile is improved; in comparative examples 30 to 32, it is known that the tackifiers are preferred, and through the mutual cooperation of the tackifiers, the polymer is easier to diffuse into the wood-plastic profile core layer, so that the viscosity is enhanced, and the anti-peeling performance and the wear resistance of the wood-plastic profile composite material are further enhanced.
It can be seen from comparative examples 32-35 that the specific components of the polyethylene copolymer are preferred to enhance the anti-peeling and wear-resistant properties of the wood-plastic composite material. As can be seen from comparative examples 35 to 37, after the polyethylene elastomer is added, the influence of the repeated change of temperature on the detachment of the surface layer material of the wood-plastic profile is reduced, so that the peel strength of the wood-plastic profile composite material is further enhanced, and meanwhile, the polyethylene elastomer has better elasticity and also enhances the properties of the wood-plastic profile composite material, such as bending strength and the like; comparing example 36 with examples 38-39, it can be seen that the release resistance of the wood-plastic profile composite is enhanced to some extent when the polyethylene elastomer is preferred.
As can be seen from comparative examples 39 to 41, specific components of the filler are preferred, and the filler is dispersed on the surface layer material of the wood-plastic profile, so that the wear resistance and the weather resistance of the wood-plastic profile composite material are better enhanced; comparative examples 43 to 46 show that the temperature at which the skin material for the wood-plastic profile is extruded from the die has a certain effect on the peel resistance of the wood-plastic profile composite, but the effect is small.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The surface layer material for the wood-plastic profile is characterized by comprising the following raw materials in parts by weight:
65-90 parts of HDPE;
3-5 parts of polyethylene copolymer;
5-15 parts of UHMWPE;
1-5 parts of a compatilizer;
1-5 parts of a tackifier;
3-10 parts of a filling agent;
0.1-0.5 part of antioxidant;
0.1-1 part of mildew preventive;
0.1-0.5 part of anti-ultraviolet absorbent;
the melt index of the HDPE is 0.02-1g/10min under the conditions of the temperature of 190 ℃ and the load of 5 kg; the relative molecular mass of the UHMWPE is 200-600 ten thousand.
2. The skin material for wood-plastic profiles as set forth in claim 1, wherein said compatibilizer comprises at least one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, and maleic anhydride grafted EVA.
3. The skin material for wood-plastic profiles as claimed in claim 1, wherein the HDPE has a melt index of 0.05-1g/10min at 190 ℃ and a load of 5 kg; the relative molecular mass of the UHMWPE is 200-400 ten thousand.
4. The skin material for wood-plastic profiles as set forth in claim 1, wherein said tackifier comprises at least one of polyisobutylene, rosin, hydrogenated rosin ester, petroleum resin, terpene resin.
5. The skin material for wood-plastic profiles as set forth in claim 1, wherein the polyethylene copolymer comprises at least one of ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-butyl acrylate copolymer, ethylene-propylene-1-butene polymer.
6. The skin material for wood-plastic profiles as claimed in claim 1, wherein the skin material for wood-plastic profiles further comprises 5-10 parts by weight of a polyethylene-based elastomer.
7. The skin material for wood-plastic composite material of claim 6, wherein the polyethylene-based elastomer comprises at least one of POE, TPO and EVA.
8. The skin material for wood-plastic profiles as set forth in claim 1, wherein the filler comprises at least one of hollow glass beads, talc, fumed silica.
9. A method for preparing a wood-plastic profile composite material, which consists of 5 to 15 weight percent of the surface layer material of the wood-plastic profile as claimed in any one of claims 1 to 8 and the balance of a wood-plastic profile core layer, and is characterized by comprising the following preparation steps:
s1, mixing HDPE, polyethylene copolymer, UHMWPE and polyethylene elastomer, adding tackifier, compatilizer, filler, antioxidant, mildew preventive and ultraviolet resistant absorbent after mixing uniformly, mixing uniformly to obtain a first mixture;
s2, performing melt extrusion on the first mixture, wherein the melt extrusion temperature is 100-190 ℃; then, obtaining the surface layer material for the wood-plastic section after circular cutting and grain cutting;
s3, respectively melting and extruding the surface layer materials of the wood-plastic section bar core layer and the wood-plastic section bar into a core body cavity and a surface layer cavity of a co-extrusion die, continuously melting and extruding, cooling and pre-cutting to obtain a wood-plastic section bar composite material semi-finished product;
the melt extrusion temperature of the wood-plastic profile core layer is 140-230 ℃;
the melting extrusion temperature of the surface layer material of the wood-plastic profile is 145-225 ℃;
and S4, polishing and cutting the semi-finished product of the wood-plastic profile composite material to obtain the wood-plastic profile composite material.
10. The method as claimed in claim 9, wherein the melt extrusion temperature of the skin material in the mold of the wood-plastic profile is 160-200 ℃ in the step S3.
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