CN114213860B - Preparation method of formaldehyde-free ultrahigh-strength biological durable wood-plastic composite material - Google Patents

Preparation method of formaldehyde-free ultrahigh-strength biological durable wood-plastic composite material Download PDF

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CN114213860B
CN114213860B CN202111629755.4A CN202111629755A CN114213860B CN 114213860 B CN114213860 B CN 114213860B CN 202111629755 A CN202111629755 A CN 202111629755A CN 114213860 B CN114213860 B CN 114213860B
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plastic composite
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attapulgite
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CN114213860A (en
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王洋
葛省波
夏常磊
苏浩
杨涵舟
叶筱琪
王艺璇
许新帅
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Nanjing Forestry University
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Abstract

The invention relates to the technical field of wood-plastic composite materials, and discloses a preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material, which comprises the following steps: s1: weighing wood powder, core-shell structure materials, micro-plastics, an antioxidant, an antibacterial agent, an ultraviolet absorbent, calcium carbonate and stearate; s2: adding the raw materials of each component in the step S1 into a mechanical stirrer and stirring; s3: adding the mixture obtained in the step S2 into a hot press forming machine for compression molding; s4: obtaining the high-strength wood-plastic composite material; the invention takes the wood powder and the micro plastic as main raw materials, and the wood powder and the micro plastic can be obtained from waste wood and waste plastic, thereby not only reducing the production cost, but also solving the problem of white pollution to a certain extent, and playing a positive promotion role in the development of environmental protection industry.

Description

Preparation method of formaldehyde-free ultrahigh-strength biological durable wood-plastic composite material
Technical Field
The invention relates to the technical field of wood-plastic composite materials, in particular to a preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material.
Background
The plastic products are widely used in the life of people due to the characteristic of portability, and when the plastic products are abandoned, if the plastic products are not properly treated, the ecological environment can be greatly damaged, and the harm of white pollution to the environment is relieved to a certain extent due to the appearance of the wood-plastic composite. The wood-plastic composite material is a plate or a section with a certain shape and size, which is prepared by taking wood or other plant fibers and thermoplastic plastics as raw materials, adding an auxiliary agent, and then carrying out processing technologies such as extrusion forming or compression molding forming. The wood-plastic composite material integrates the excellent properties of wood and plastic, namely has the natural environmental protection property of wood and the water resistance and good processing property of plastic, and can be applied to various fields of building gardens, automobile interiors, packaging and transportation, interior decoration and the like. However, the wood-plastic composite material used outdoors is easy to crack, fade, decay and other aging phenomena due to long-term exposure in the natural environment, thereby shortening the service life of the wood-plastic product. How to obtain excellent biological durability of the wood-plastic composite material becomes a problem which needs to be solved urgently at present.
On the other hand, the conventional artificial board product has the problem of formaldehyde release, and formaldehyde is the main cause of various physiological diseases including chronic respiratory diseases. Therefore, the environmental protection policy of our country is continuously tightened about formaldehyde release, and the national standard GB/T39600-. But the most effective mode for solving the problem of formaldehyde release is to achieve zero formaldehyde release on production raw materials from the root, and the production of the wood-plastic composite material capable of replacing the artificial board product can be achieved through reasonable design.
Based on the above, a preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite is provided, and hopefully, the defects in the prior art are overcome.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the problems, develops a preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material, and aims to produce the wood-plastic composite material which is environment-friendly and has excellent mechanical property and biological durability.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite comprises the following steps:
s1: weighing 70-90 parts of wood powder, 6-10 parts of core-shell structure material, 12-30 parts of micro plastic, 2-4 parts of antioxidant, 2-4 parts of antibacterial agent, 2-3 parts of ultraviolet absorbent, 6-9 parts of calcium carbonate and 4-6 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 5-8 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 160-200 ℃, the hot-pressing pressure is 9-14MPa, and the hot-pressing time is 19-28 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
As a further technical scheme: the grain size of the wood powder is 60-100 meshes;
the wood flour is pine wood flour.
As a further technical scheme, the preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
As a further technical scheme, the mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
As a further technical scheme: the particle size of the micro plastic is 60-80 meshes.
As a further technical scheme: the antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
As a further technical scheme, the antibacterial agent is nano TiO 2 。
As a further technical scheme, the ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
As a further technical scheme, the particle size of the calcium carbonate is 600-1250 meshes.
As a further technical scheme, the stearate is selected from calcium stearate.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of the formaldehyde-free ultrahigh-strength biological durable wood-plastic composite material, which has the following beneficial effects:
(1) the invention takes the wood powder and the micro plastic as main raw materials, and the wood powder and the micro plastic can be obtained from waste wood and waste plastic, thereby not only reducing the production cost, but also solving the problem of white pollution to a certain extent, and playing a positive promotion role in the development of environmental protection industry.
(2) The wood-plastic composite material prepared by the invention does not contain formaldehyde substances.
(3) The invention adopts compression molding as a production process, and greatly improves the mechanical strength of the product.
(4) The light calcium carbonate is added in the material mixing process, so that the smoothness and the flatness of the surface of the product are improved, and the strength and the hardness of the product are further improved.
(5) Calcium stearate is preferably used as a lubricant and a release agent in the production of the wood-plastic material, so that the processability of the product is improved.
(6) Aiming at the problem that the existing wood-plastic composite material is easy to crack, fade, decay and other aging phenomena under outdoor conditions, the invention adds the preferred antibacterial agent, the core-shell structure material, the antioxidant and the ultraviolet absorbent, the core-shell structure material absorbs energy, and particularly the absorption of ultraviolet rays in a medium wave region is obviously enhanced, meanwhile, in a composite material system, a stronger covalent bond can be formed between the core-shell structure material and other components, the destructive effect energy is improved, and meanwhile, the composite material has a certain effect of capturing active groups, so that the ultraviolet aging resistance is greatly improved. Endows the wood-plastic composite material with excellent biological durability, prolongs the service life of the product and enlarges the application range of the product.
Drawings
FIG. 1 is a graph showing the influence of different core-shell structure materials added in parts by weight on aging resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite comprises the following steps:
s1: weighing 70 parts of wood powder, 6 parts of core-shell structure material, 12 parts of micro plastic, 2 parts of antioxidant, 2 parts of antibacterial agent, 2 parts of ultraviolet absorbent, 6 parts of calcium carbonate and 4 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 5 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 160 ℃, the hot-pressing pressure is 9MPa, and the hot-pressing time is 19 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
The grain size of the wood powder is 60 meshes;
the wood flour is pine wood flour.
The preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
The mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
The micro plastic is any one of polyvinyl chloride and polypropylene, and the particle size of the micro plastic is 60-80 meshes.
The antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
The antibacterial agent is nano TiO 2 。
The ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
The particle size of the calcium carbonate is 600 meshes.
The stearate is calcium stearate.
Example 2
A preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material comprises the following steps:
s1: weighing 72 parts of wood powder, 7 parts of core-shell structure material, 15 parts of micro plastic, 3 parts of antioxidant, 3 parts of antibacterial agent, 2.2 parts of ultraviolet absorbent, 7 parts of calcium carbonate and 4.5 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 6 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 180 ℃, the hot-pressing pressure is 10MPa, and the hot-pressing time is 20 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
The grain size of the wood powder is 80 meshes;
the wood flour is pine wood flour.
The preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
The mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
The micro plastic is any one of polyvinyl chloride and polypropylene, and the particle size of the micro plastic is 60-80 meshes.
The antioxidant is one of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
The antibacterial agent is nano TiO 2 。
The ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
The particle size of the calcium carbonate is 1050 meshes.
The stearate is calcium stearate.
Example 3
A preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material comprises the following steps:
s1: weighing 78 parts of wood powder, 8 parts of core-shell structure material, 18 parts of micro plastic, 3 parts of antioxidant, 3 parts of antibacterial agent, 2.5 parts of ultraviolet absorbent, 8 parts of calcium carbonate and 5 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 6 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 180 ℃, the hot-pressing pressure is 12MPa, and the hot-pressing time is 22 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
The grain size of the wood powder is 70 meshes;
the wood flour is pine wood flour.
The preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
The mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
The micro plastic is any one of polyvinyl chloride and polypropylene, and the particle size of the micro plastic is 60-80 meshes.
The antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
The antibacterial agent is nano TiO 2 。
The ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tertiary butyl-5' -methylphenyl) -5-chlorobenzotriazole.
The particle size of the calcium carbonate is 800 meshes.
The stearate is selected from calcium stearate.
Example 4
A preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material comprises the following steps:
s1: weighing 78 parts of wood powder, 8 parts of core-shell structure material, 20 parts of micro plastic, 3 parts of antioxidant, 3 parts of antibacterial agent, 2.6 parts of ultraviolet absorbent, 8 parts of calcium carbonate and 5 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 7 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 180 ℃, the hot-pressing pressure is 12MPa, and the hot-pressing time is 22 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
The grain size of the wood powder is 90 meshes;
the wood flour is pine wood flour.
The preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
The mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
The micro plastic is any one of polyvinyl chloride and polypropylene, and the particle size of the micro plastic is 60-80 meshes.
The antioxidant is one of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
The antibacterial agent is nano TiO 2 。
The ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
The particle size of the calcium carbonate is 1200 meshes.
The stearate is selected from calcium stearate.
Example 5
A preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material comprises the following steps:
s1: weighing 85 parts of wood powder, 8 parts of core-shell structure material, 25 parts of micro plastic, 3 parts of antioxidant, 3 parts of antibacterial agent, 2.5 parts of ultraviolet absorbent, 8 parts of calcium carbonate and 5 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 5-8 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 190 ℃, the hot-pressing pressure is 12MPa, and the hot-pressing time is 25 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
The grain size of the wood powder is 90 meshes;
the wood flour is pine wood flour.
The preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
The mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
The micro plastic is any one of polyvinyl chloride and polypropylene, and the particle size of the micro plastic is 60-80 meshes.
The antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
The antibacterial agent is nano TiO 2 。
The ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
The particle size of the calcium carbonate is 1200 meshes.
The stearate is selected from calcium stearate.
Example 6
A preparation method of an aldehyde-free ultrahigh-strength biological durable wood-plastic composite material comprises the following steps:
s1: weighing 90 parts of wood powder, 10 parts of core-shell structure material, 30 parts of micro plastic, 4 parts of antioxidant, 4 parts of antibacterial agent, 3 parts of ultraviolet absorbent, 9 parts of calcium carbonate and 6 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 8 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 200 ℃, the hot-pressing pressure is 14MPa, and the hot-pressing time is 28 min;
s4: and (5) cooling the board pressed in the step S3 to room temperature by water to obtain the high-strength wood-plastic composite material.
The grain size of the wood powder is 100 meshes;
the wood flour is pine wood flour.
The preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the high-performance polyethylene terephthalate resin.
The mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
The micro plastic is any one of polyvinyl chloride and polypropylene, and the particle size of the micro plastic is 60-80 meshes.
The antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
The antibacterial agent is nano TiO 2 。
The ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
The particle size of the calcium carbonate is 1250 meshes.
The stearate is calcium stearate.
Test of
And (3) testing the density of the wood-plastic composite material of the embodiment, namely performing section density test on a sample by using a DAX5000 section density analyzer, wherein the scanning frequency is 0.02 mm/time, and recording the section density data:
TABLE 1
Density g/cm 3
Example 1 0.49
Example 2 0.51
Example 3 0.53
Example 4 0.49
Example 5 0.52
Example 6 0.50
Pine wood 0.72
As can be seen from Table 1, the density of the wood-plastic composite material prepared by the invention is obviously reduced, and the wood-plastic composite material prepared by the invention can better realize light weight.
Further experiments, the performance of the wood-plastic composite material of the embodiment and the comparative example is detected and compared:
TABLE 2
Figure GDA0003798026390000131
Figure GDA0003798026390000141
Comparative example 1: the difference from the embodiment 1 is that the core-shell structure material is replaced by equal amount of rosin;
comparative example 2: the difference from the embodiment 1 is that no core-shell structure material is added;
comparative example 3: the difference from the embodiment 1 is that the core-shell structural material is replaced by equal amount of polyethylene;
wherein, the bending strength is tested according to the method specified by ASTM standard plastic bending test standard D790-03, the length of the test piece is 80mm, the width is 13mm, the span is 64mm, and the pressurizing speed is 2 mm/min; the water absorption rate refers to the ratio of the weight increment of the sample after being soaked in water for 24 hours compared with the weight increment before soaking to the weight before soaking, and the soaking adopts complete soaking;
as can be seen from Table 2, the wood-plastic composite material prepared by the invention is not only green and environment-friendly, but also has excellent mechanical properties.
Further experiment, aging experiment, namely irradiating the wood-plastic composite material prepared in the embodiment and the comparative example by using a xenon arc lamp at 30 ℃, wherein the luminous flux of the xenon arc lamp is 6000lux, and the irradiation time is 2000 h;
TABLE 3
Figure GDA0003798026390000142
Figure GDA0003798026390000151
Comparative example 1: the difference from the embodiment 1 is that the core-shell structural material is replaced by equal rosin;
comparative example 2: the difference from the embodiment 1 is that no core-shell structure material is added;
comparative example 3: the difference from the embodiment 1 is that the core-shell structural material is replaced by equal amount of polyethylene;
as can be seen from Table 3, the aging resistance of the wood-plastic composite material can be greatly improved by introducing a certain amount of core-shell structure material.
Based on example 1, the influence of the added weight parts of different core-shell structure materials on the aging resistance is compared.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The preparation method of the formaldehyde-free ultrahigh-strength biological durable wood-plastic composite is characterized by comprising the following steps of:
s1: weighing 70-90 parts of wood powder, 6-10 parts of core-shell structure material, 12-30 parts of micro plastic, 2-4 parts of antioxidant, 2-4 parts of antibacterial agent, 2-3 parts of ultraviolet absorbent, 6-9 parts of calcium carbonate and 4-6 parts of stearate;
s2: adding the raw materials of the components in the step S1 into a mechanical stirrer, and stirring for 5-8 minutes to fully and uniformly mix the materials;
s3: adding the mixture obtained in the step S2 into a hot-pressing forming machine for compression molding, wherein the hot-pressing temperature is 160-200 ℃, the hot-pressing pressure is 9-14MPa, and the hot-pressing time is 19-28 min;
s4: cooling the board pressed in the step S3 to room temperature by water to obtain a high-strength wood-plastic composite material;
the preparation method of the core-shell structure material comprises the following steps:
sequentially adding attapulgite, maleic anhydride grafted polyethylene, zinc borate and rosin resin into a stirrer, uniformly stirring, and then adding into a double-screw extruder for melt extrusion granulation to obtain the modified attapulgite modified resin;
the mixing weight ratio of the attapulgite, the maleic anhydride grafted polyethylene, the zinc borate and the rosin resin is as follows: 5:10:1: 4;
the screw rotating speed of the double-screw extruder is 20r/min, the feeding speed is 1.8kg/h, and the temperatures of 1-5 areas of the granulation section are respectively set to be 150 ℃, 155 ℃, 160 ℃ and 162 ℃;
the attapulgite is micron-sized attapulgite with the granularity of 150 mu m, and is subjected to modification treatment:
uniformly dispersing attapulgite into a sodium alginate solution with the mass fraction of 10%, wherein the mixing mass ratio of the attapulgite to the sodium alginate solution is 1: 5; mixing attapulgite and potassium phthalimide in a mass ratio of 10:1, adding potassium phthalimide, adjusting the temperature to 80 ℃, keeping the temperature and stirring for 2 hours, filtering, and drying;
the grafting rate of the maleic anhydride grafted polyethylene is 1.5 percent;
the melt flow rate of the maleic anhydride grafted polyethylene was 0.045 g/min.
2. The method for preparing the aldehyde-free ultrahigh-strength biodurable wood-plastic composite material according to claim 1, wherein the method comprises the following steps: the grain size of the wood powder is 60-100 meshes;
the wood flour is pine wood flour.
3. The method for preparing the formaldehyde-free ultrahigh-strength biodurable wood-plastic composite material according to claim 1, wherein the method comprises the following steps: the particle size of the micro plastic is 60-80 meshes.
4. The method for preparing the aldehyde-free ultrahigh-strength biodurable wood-plastic composite material according to claim 1, wherein the method comprises the following steps: the antioxidant is one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
5. According to claim1, the preparation method of the aldehyde-free ultrahigh-strength biological durable wood-plastic composite is characterized in that the antibacterial agent is nano TiO 2 。
6. The method for preparing the formaldehyde-free ultrahigh-strength biodurable wood-plastic composite according to claim 1, wherein the ultraviolet absorbent is 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole.
7. The method as claimed in claim 1, wherein the particle size of the calcium carbonate is 600-1250 mesh.
8. The method for preparing the formaldehyde-free ultrahigh-strength biodurable wood-plastic composite as claimed in claim 1, wherein the stearate is selected from calcium stearate.
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