High-pressure plastic-wood plate capable of releasing negative ions as well as preparation process and application of high-pressure plastic-wood plate

Abstract

The invention relates to the technical field of wood-plastic composite materials, in particular to a high-pressure plastic-wood board capable of releasing negative ions and a preparation process and application thereof, and the high-pressure plastic-wood board comprises the following components: pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, a negative ion releasing agent, a silane coupling agent and zinc stearate; wherein the negative ion releasing agent is prepared by loading a catalytic layer and an oleophobic layer on a negative ion ball. According to the design, an aluminum oxide-tourmaline-silica sol composite system is adopted for preparing negative ion balls to serve as a carrier, the high specific surface area and mechanical strength are provided, a negative ion release channel is maintained, activated carbon-titanium dioxide-beta-cyclodextrin-ammonium bicarbonate composite slurry is prepared to obtain a catalyst layer, and the catalyst layer has the advantages that the catalytic effect is good; the oil stain is dynamically removed through an adsorption-degradation path, the oleophobic layer repels the oil stain through low surface energy, active and passive dual protection is formed through combination of the adsorption-degradation path and the oleophobic layer, and the long-term effect and the oil stain resistance of negative ion release are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wood-plastic composite materials, and specifically, to a high-pressure wood-plastic board capable of releasing negative ions, its preparation process and application. Background Art

[0002] High-pressure wood-plastic boards, also known as wood-plastic composite materials and high-pressure formed boards, are a new type of environmentally friendly material that has developed rapidly in recent years. With the increasing prominence of global environmental problems, people's attention to sustainable development and environmental protection has been continuously improved. The overuse of traditional wood has led to a sharp reduction in forest resources, while the large amount of discarded plastic waste has caused serious "white pollution". The emergence of high-pressure wood-plastic boards provides an effective way to realize the resource utilization of waste plastics and biomass fibers. However, the functions of pure high-pressure wood-plastic boards are relatively single. With the continuous progress in the field of materials science, adding negative ion release materials to high-pressure wood-plastic boards has become a research direction with great market potential and competitiveness.

[0003] However, when traditional high-pressure wood-plastic boards are applied to the floors of mechanical component repair workshops such as automobile engines and ship engines, they usually involve the adhesion of oily substances such as engine oil and fuel. A large amount of oily substances will volatilize and splash to form oily aerosols. The particles of oily aerosols will adhere to the surface of tourmaline, forming a physical barrier that hinders the ionization reaction on the surface of tourmaline, thereby reducing the generation and release of negative ions. In view of this, we propose a high-pressure wood-plastic board capable of releasing negative ions, its preparation process and application. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure wood-plastic board capable of releasing negative ions, its preparation process and application, so as to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides a high-pressure wood-plastic board capable of releasing negative ions. The high-pressure wood-plastic board includes pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion release agent, silane coupling agent and zinc stearate; Among them, the negative ion release agent is prepared from a negative ion ball loaded with a catalytic layer and an oil-repellent layer.

[0006] Preferably, the preparation method of the negative ion release agent is as follows: Mix alumina powder, tourmaline powder and silica sol evenly, press them into spherical particles with a diameter of 1-1.5 mm under a pressure of 20-30 MPa in a dry pressing machine, then place them in a box-type sintering furnace and sinter at 450-455 °C for 2-3 h, with a heating rate of 5 °C / min, and cool naturally to room temperature to obtain negative ion balls; Mix activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate and disperse them in polyvinyl alcohol to obtain a mixed slurry. Ultrasonically spray the mixed slurry onto the surface of the negative ion ball 2-3 times, with a frequency of 35-40 kHz, a power of 200-300 W, a carrier gas pressure of 0.2-0.3 MPa, a spraying rate of 1-5 mL / min, and then dry and cure at 30-40 °C to obtain a catalytic layer; Dry-mix high-density polyethylene, nano-silica and nano-mica flakes, and place them in a fluidized bed to melt and coat them on the surface of the catalytic layer. The inlet air temperature is 55-60 °C, the fluidization wind speed is 1-3 m / s, the spray gun temperature is 155-160 °C, the spraying rate is 5 g / min. After spraying, maintain at 70-80 °C for 5 min, and then cool down to 60-65 °C for curing. After curing, in a vacuum reaction chamber, introduce vapor of tridecafluorohexyltrimethoxysilane carried by nitrogen carrier gas, control the partial pressure of tridecafluorohexyltrimethoxysilane to be 0.03-0.05 Pa, the carrier gas flow rate is 0.5-1 L / min, carry out vapor deposition for 1.5-2 h, the vacuum degree is 0.2-0.3 Pa, and the temperature is 70-75 °C to form an oil-repellent layer, obtaining a negative ion releasing agent.

[0007] Prepare negative ion balls using alumina powder, tourmaline powder and silica sol. Alumina powder is used as the framework material to provide high mechanical strength and high temperature resistance. Tourmaline powder releases negative ions. Silica sol is used as a binder to form a three-dimensional network during the sintering process to fix alumina and tourmaline particles; activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate construct a catalytic layer. The high specific surface area of activated carbon powder captures oily substances through physical adsorption. Titanium dioxide catalyzes the degradation of organic substances. β-cyclodextrin adsorbs oily molecules through its hydrophobic cavity. Ammonium bicarbonate promotes the formation of mesoporous structures through high temperature in the step of preparing the oil-repellent layer; high-density polyethylene, nano-silica, nano-mica flakes and tridecafluorohexyltrimethoxysilane are used to prepare the oil-repellent layer. The gas generated by the decomposition of ammonium bicarbonate is used to form pores in the oil-repellent layer. Nano-silica and nano-mica flakes are used to improve the mechanical strength and temperature resistance of the oil-repellent layer. Combine the negative ion ball, the catalytic layer and the oil-repellent layer to design a three-layer gradient structure of "coarse filtration at the entrance - catalysis in the middle layer - release at the end". The outer oil-repellent grid intercepts large particles of oily aerosol, the middle layer adsorbs and catalyzes the degradation of small molecule oil stains, and the inner layer ensures the release of negative ions, effectively slowing down the phenomenon that the release effect of negative ions by tourmaline powder is reduced due to the attachment of oily molecules.

[0008] Preferably, the mass ratio of the alumina powder, tourmaline powder to silica sol is 6.5-7.2:1.5-2:1.

[0009] Preferably, the silica content in the silica sol is 26-33%.

[0010] Preferably, the mass ratio of the activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate is 5.7-6.1:2-2.5:2:0.7-0.9.

[0011] Preferably, the solid content of the mixed slurry is 35-45%.

[0012] Preferably, the mass ratio of the high-density polyethylene, nano-silica and nano-mica flakes is 8.3-8.5:1-1.5:0.5.

[0013] On the other hand, the present invention provides a preparation process of a high-pressure plastic-wood board capable of releasing negative ions, which is used to prepare the above-mentioned high-pressure plastic-wood board capable of releasing negative ions, and includes the following steps: Premix pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent, and zinc stearate in a high-speed mixer at 800-1000 rpm for 5-8 minutes, and then place it in a twin-screw extruder. The temperature of the first zone is 130-140 °C, the temperature of the second zone is 160-170 °C, the temperature of the third zone is 165-175 °C, the die head temperature is 155-165 °C, and the vacuum degree of the exhaust section of the extruder is -0.1 MPa to obtain a plastic-wood masterbatch. Place the plastic-wood masterbatch in a hot pressing mold, apply a pressure of 15-20 MPa, set the temperature at 175-185 °C, and keep the pressure for 8-12 minutes. Then, air-cool it to 100-110 °C while maintaining the pressure, and then water-cool it to 40-50 °C to demold and obtain a high-pressure plastic-wood board capable of releasing negative ions.

[0014] Preferably, there are 45-50 parts by weight of pine wood powder, 32-38 parts by weight of high-density polyethylene, 1-5 parts by weight of maleic anhydride grafted polyethylene, 4-8 parts by weight of negative ion releasing agent, 0.5-1 part by weight of silane coupling agent, and 0.3-0.5 part by weight of zinc stearate.

[0015] On the other hand, the present invention provides an application of the above-mentioned high-pressure plastic-wood board capable of releasing negative ions in floors.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In the high-pressure plastic-wood board capable of releasing negative ions and its preparation process and application, a negative ion releasing agent is used, with a negative ion ball as the carrier. Through an alumina-tourmaline-silica sol composite system, the negative ion releasing performance of tourmaline is retained. With a catalytic layer as the intermediate layer, an adsorption and catalytic dual degradation network is constructed through an activated carbon-titanium dioxide-β-cyclodextrin-ammonium bicarbonate composite slurry. With an oil-repellent layer as the protective layer, the penetration of oily molecules is blocked, effectively protecting the continuous release of the negative ion ball and realizing the long-term effect of negative ion release. Specific embodiments

[0017] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] A high-pressure plastic-wood board capable of releasing negative ions according to the present invention comprises the following components: the high-pressure plastic-wood board includes pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent, and zinc stearate. Among them, the negative ion releasing agent is prepared by loading a catalytic layer and an oil-repellent layer on a negative ion ball.

[0019] Example 1: A high-pressure plastic-wood board capable of releasing negative ions and its preparation process, comprising the following steps: The high-pressure plastic-wood board includes pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent, and zinc stearate. Among them, the negative ion releasing agent is prepared by loading a catalytic layer and an oil-repellent layer on a negative ion ball; the mass ratio of alumina powder, tourmaline powder, and silica sol is 6.5:1.5:1; the silica content in the silica sol is 33%; the mass ratio of activated carbon powder, titanium dioxide, β-cyclodextrin, and ammonium bicarbonate is 6.1:2:2:0.9; the solid content of the mixed slurry is 45%; the mass ratio of high-density polyethylene, nano-silica, and nano-mica flakes is 8.3:1:0.5. 45 parts by weight of pine wood powder, 38 parts by weight of high-density polyethylene, 1 part by weight of maleic anhydride grafted polyethylene, 8 parts by weight of negative ion releasing agent, 0.5 part by weight of silane coupling agent, and 0.5 part by weight of zinc stearate. Mix alumina powder, tourmaline powder, and silica sol evenly, press them into spherical particles with a diameter of 1 mm under a pressure of 20 MPa in a dry pressing machine, then place them in a box-type sintering furnace and sinter at 450 °C for 2 h, with a heating rate of 5 °C / min, and naturally cool to room temperature to obtain negative ion balls. Disperse activated carbon powder, titanium dioxide, β-cyclodextrin, and ammonium bicarbonate in polyvinyl alcohol to obtain a mixed slurry. Spray the mixed slurry onto the surface of the negative ion ball ultrasonically 3 times, with a frequency of 35 kHz, a power of 200 W, a carrier gas pressure of 0.2 MPa, a spraying rate of 1 mL / min, and then dry and cure at 30 °C to obtain a catalytic layer. Dry mix high-density polyethylene, nano-silica, and nano-mica flakes, place them in a fluidized bed, and melt-coat them onto the surface of the catalytic layer. The inlet air temperature is 60°C, the fluidization wind speed is 1 m / s, the spray gun temperature is 160°C, the spraying rate is 5 g / min. After spraying, maintain at 80°C for 5 min first, and then cool down to 60°C for curing. After curing, in a vacuum reaction chamber, introduce vapor of tridecafluorohexyltrimethoxysilane carried by nitrogen carrier gas, control the partial pressure of tridecafluorohexyltrimethoxysilane to be 0.05 Pa, the carrier gas flow rate is 1 L / min, perform vapor deposition for 2 h, the vacuum degree is 0.2 Pa, and the temperature is 75°C to form an oil-repellent layer, thus obtaining a negative ion releasing agent; Premix pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent, and zinc stearate in a high-speed mixer at 800 rpm for 5 min, and then place them in a twin-screw extruder. The temperature of the first zone is 130°C, the temperature of the second zone is 160°C, the temperature of the third zone is 165°C, and the die head temperature is 155°C. The vacuum degree of the exhaust section of the extruder is -0.1 MPa to obtain a wood-plastic masterbatch. Place the wood-plastic masterbatch in a hot press mold, apply a pressure of 15 MPa, set the temperature at 175°C, and the pressure holding time is 8 min. Then, cool it to 100°C by air cooling under pressure, and then cool it to 50°C by water cooling, and demold to obtain a high-pressure wood-plastic board capable of releasing negative ions.

[0020] Example 2: A high-pressure wood-plastic board capable of releasing negative ions and its preparation process, including the following steps: The high-pressure wood-plastic board includes pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent, and zinc stearate; Among them, the negative ion releasing agent is prepared by loading a catalytic layer and an oil-repellent layer on a negative ion ball; the mass ratio of alumina powder, tourmaline powder, and silica sol is 6.5:1.75:1; the silica content in the silica sol is 33%; the mass ratio of activated carbon powder, titanium dioxide, β-cyclodextrin, and ammonium bicarbonate is 6.1:2.25:2:0.9; the solid content of the mixed slurry is 45%; the mass ratio of high-density polyethylene, nano-silica, and nano-mica flakes is 8.3:1:0.5; 45 parts by weight of pine wood powder, 38 parts by weight of high-density polyethylene, 1 part by weight of maleic anhydride grafted polyethylene, 8 parts by weight of negative ion releasing agent, 0.5 part by weight of silane coupling agent, and 0.5 part by weight of zinc stearate; Mix alumina powder, tourmaline powder, and silica sol evenly, press them into spherical particles with a diameter of 1 mm under a pressure of 20 MPa in a dry pressing molding machine, and then place them in a box-type sintering furnace for sintering at 450°C for 2 h, with a heating rate of 5°C / min, and naturally cool to room temperature to obtain a negative ion ball; Mix activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate and disperse them in polyvinyl alcohol to obtain a mixed slurry. Ultrasonically spray the mixed slurry onto the surface of the negative ion ball 3 times, with a frequency of 35 kHz, a power of 200 W, a carrier gas pressure of 0.2 MPa, a spraying rate of 1 mL / min, and then dry and cure at 30 °C to obtain a catalytic layer; Dry-mix high-density polyethylene, nano-silica and nano-mica flakes, and place them in a fluidized bed to melt and coat them on the surface of the catalytic layer. The inlet air temperature is 60 °C, the fluidization wind speed is 1 m / s, the spray gun temperature is 160 °C, the spraying rate is 5 g / min. After spraying, maintain at 80 °C for 5 min first, and then cool down to 60 °C for curing. After curing, in a vacuum reaction chamber, introduce vapor of tridecafluorohexyltrimethoxysilane carried by nitrogen carrier gas, control the partial pressure of tridecafluorohexyltrimethoxysilane to be 0.05 Pa, the carrier gas flow rate is 1 L / min, carry out vapor deposition for 2 h, the vacuum degree is 0.2 Pa, and the temperature is 75 °C to form an oil-repellent layer, obtaining a negative ion releasing agent; Premix pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent and zinc stearate in a high-speed mixer at 800 rpm for 5 min, and then place them in a twin-screw extruder. The temperature of the first zone is 130 °C, the temperature of the second zone is 160 °C, the temperature of the third zone is 165 °C, and the die head temperature is 155 °C. The vacuum degree of the exhaust section of the extruder is -0.1 MPa to obtain a plastic-wood masterbatch. Place the plastic-wood masterbatch in a hot pressing mold, apply a pressure of 15 MPa, set the temperature at 175 °C, and keep the pressure for 8 min. Then cool it to 100 °C by air cooling under pressure and then cool it to 50 °C by water cooling, and demold to obtain a high-pressure plastic-wood board capable of releasing negative ions.

[0021] Example 3: A high-pressure plastic-wood board capable of releasing negative ions and its preparation process, including the following steps: The high-pressure plastic-wood board includes pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent and zinc stearate; Among them, the negative ion releasing agent is prepared by loading a catalytic layer and an oil-repellent layer on a negative ion ball; the mass ratio of alumina powder, tourmaline powder and silica sol is 6.5:2:1; the silica content in the silica sol is 33%; the mass ratio of activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate is 6.1:2.5:2:0.9; the solid content of the mixed slurry is 45%; the mass ratio of high-density polyethylene, nano-silica and nano-mica flakes is 8.3:1:0.5; 45 parts by weight of pine wood powder, 38 parts by weight of high-density polyethylene, 1 part by weight of maleic anhydride grafted polyethylene, 8 parts by weight of negative ion releasing agent, 0.5 part by weight of silane coupling agent, 0.5 part by weight of zinc stearate; Mix alumina powder, tourmaline powder and silica sol evenly, press them into spherical particles with a diameter of 1 mm under a pressure of 20 MPa in a dry pressing machine, then place them in a box-type sintering furnace and sinter at 450 °C for 2 h, with a heating rate of 5 °C / min, and cool naturally to room temperature to obtain negative ion balls; Mix activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate and disperse them in polyvinyl alcohol to obtain a mixed slurry. Spray the mixed slurry ultrasonically onto the surface of the negative ion balls 3 times, with a frequency of 35 kHz, a power of 200 W, a carrier gas pressure of 0.2 MPa, a spraying rate of 1 mL / min, and then dry and cure at 30 °C to obtain a catalytic layer; Dry-mix high-density polyethylene, nano-silica and nano-mica flakes, and place them in a fluidized bed to melt and coat them on the surface of the catalytic layer. The inlet gas temperature is 60 °C, the fluidization air velocity is 1 m / s, the spray gun temperature is 160 °C, the spraying rate is 5 g / min. After spraying, maintain at 80 °C for 5 min first, and then cool down to 60 °C for curing. After curing, in a vacuum reaction chamber, introduce vapor of tridecafluorohexyltrimethoxysilane carried by nitrogen carrier gas, control the partial pressure of tridecafluorohexyltrimethoxysilane to be 0.05 Pa, the carrier gas flow rate to be 1 L / min, and perform chemical vapor deposition for 2 h, with a vacuum degree of 0.2 Pa and a temperature of 75 °C to form an oil-repellent layer, and obtain a negative ion releasing agent; Premix pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent and zinc stearate in a high-speed mixer at 800 rpm for 5 min, then place them in a twin-screw extruder, with the temperature of the first zone being 130 °C, the temperature of the second zone being 160 °C, the temperature of the third zone being 165 °C, and the die head temperature being 155 °C. The vacuum degree of the exhaust section of the extruder is -0.1 MPa to obtain a wood-plastic masterbatch. Place the wood-plastic masterbatch in a hot pressing mold, apply a pressure of 15 MPa, set the temperature to 175 °C, and keep the pressure for 8 min. Then cool it to 100 °C by air cooling under pressure, and then cool it to 50 °C by water cooling, and demold to obtain a high-pressure wood-plastic board capable of releasing negative ions.

[0022] Example 4: A high-pressure wood-plastic board capable of releasing negative ions and its preparation process, including the following steps: The high-pressure wood-plastic board includes pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent and zinc stearate; Among them, the negative ion releasing agent is prepared by loading a catalytic layer and an oil-repellent layer on the negative ion ball; the mass ratio of alumina powder, tourmaline powder and silica sol is 6.5:2:1; the silica content in the silica sol is 33%; the mass ratio of activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate is 6.1:2.5:2:0.9; the solid content of the mixed slurry is 45%; the mass ratio of high-density polyethylene, nano-silica and nano-mica flakes is 8.3:1:0.5; 45 parts by weight of pine wood powder, 38 parts by weight of high-density polyethylene, 1 part by weight of maleic anhydride grafted polyethylene, 8 parts by weight of negative ion releasing agent, 0.5 part by weight of silane coupling agent, 0.5 part by weight of zinc stearate; Mix alumina powder, tourmaline powder and silica sol evenly, press them into spherical particles with a diameter of 1 mm under a pressure of 20 MPa in a dry pressing machine, then place them in a box-type sintering furnace and sinter at 450 °C for 2 h, with a heating rate of 5 °C / min, and cool naturally to room temperature to obtain negative ion balls; Mix activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate and disperse them in polyvinyl alcohol to obtain a mixed slurry. Spray the mixed slurry ultrasonically onto the surface of the negative ion balls 3 times, with a frequency of 35 kHz, a power of 200 W, a carrier gas pressure of 0.2 MPa, a spraying rate of 1 mL / min, and then dry and cure at 30 °C to obtain a catalytic layer; Dry-mix high-density polyethylene, nano-silica and nano-mica flakes, and place them in a fluidized bed to melt and coat them on the surface of the catalytic layer. The inlet air temperature is 60 °C, the fluidization air velocity is 1 m / s, the spray gun temperature is 160 °C, the spraying rate is 5 g / min. After spraying, maintain at 80 °C for 5 min, then cool down to 60 °C for curing. After curing, in a vacuum reaction chamber, introduce vapor of tridecafluorohexyltrimethoxysilane carried by nitrogen carrier gas, control the partial pressure of tridecafluorohexyltrimethoxysilane to be 0.005 Pa, the carrier gas flow rate to be 1 L / min, and perform chemical vapor deposition for 2 h, with a vacuum degree of 0.2 Pa and a temperature of 75 °C to form an oil-repellent layer, and obtain a negative ion releasing agent; Premix 45 parts by weight of pine wood powder, 38 parts by weight of high-density polyethylene, 1 part by weight of maleic anhydride grafted polyethylene, 8 parts by weight of negative ion releasing agent, 0.5 part by weight of silane coupling agent, 0.5 part by weight of zinc stearate in a high-speed mixer at 800 rpm for 5 min, then place them in a twin-screw extruder. The temperature of the first zone is 130 °C, the temperature of the second zone is 160 °C, the temperature of the third zone is 165 °C, the die head temperature is 155 °C, and the vacuum degree of the exhaust section of the extruder is -0.1 MPa to obtain a wood-plastic masterbatch. Place the wood-plastic masterbatch in a hot pressing mold, apply a pressure of 15 MPa, set the temperature at 175 °C, and keep the pressure for 8 min. Then, while maintaining the pressure, cool it air-cooled to 100 °C, and then water-cooled to 50 °C, and demold to obtain a high-pressure wood-plastic board capable of releasing negative ions.

[0023] Comparative Example 1: Using the method of Example 3, directly use tourmaline powder and prepare a high-pressure wood-plastic board by physical mixing with the raw materials of the wood-plastic masterbatch, without performing the preparation step of the negative ion releasing agent.

[0024] Comparative Example 2: Using the method of Example 3, directly use the negative ion balls and the oil-repellent layer, without modifying the negative ion balls and the oil-repellent layer through the catalytic layer.

[0025] Comparative Example 3: Using the method of Example 3, directly use the negative ion balls and the catalytic layer, without modifying the negative ion balls and the catalytic layer through the oil-repellent layer.

[0026] The present invention adopts a negative ion releasing agent to prepare a high-pressure plastic wood board capable of releasing negative ions, wherein the performance index inspection items and inspection standards of the high-pressure plastic wood board are as follows: After cleaning and drying the sample, SAE 10W-40 engine oil was dispersed into 1-5μm droplets by ultrasonic atomizer and sprayed on the surface with a concentration of 50mg / m³ and a spraying time of 5min. Under natural light, the sample was preheated to 85℃ for 8h and cooled naturally for 30min. After 100 cycles of spraying the engine oil mist, the surface oleophobicity and negative ion release attenuation rate were tested. Under 25℃ environment, 5μL engine oil droplets were added to the sample surface with a syringe to test its contact angle θ. The judgment standard was: θ>100°: the anti-oil performance was qualified; at the same time, the sample was fixed on an inclined platform, 5μL engine oil droplets were added, and the platform was slowly tilted at a rate of 1° / s until the droplets began to roll, and the critical angle α when the droplets completely detached from the surface was recorded. The judgment standard was: α≤25°: the self-cleaning performance was qualified; α>25°: unqualified; the sample was placed in a closed test cabin (1m 3 , 25±1℃, 60±5%RH) for 24h, and then use COM-3200PRO negative ion detector to test the negative ion release after 24h. The release amount decay rate = (initial value-final value) / initial value×100%.

[0027] According to the above standards, the high pressure plastic wood board prepared in the above examples 1-4 and comparative examples 1-3 was tested, and the obtained data is shown in Table 1: Table 1 Performance data of Examples 1-4 and Comparative Examples 1-3

[0028] The above data fully show that compared with Comparative Examples 1-3, Examples 1-4 can fully show the effect of the negative ion release agent on the long-term negative ion release and anti-oil performance of the high-pressure plastic wood board.

[0029] Since the present invention uses a negative ion releaser to prepare the high-pressure plastic wood board, the negative ion releaser effectively improves the performance of the high-pressure plastic wood board, as follows: It can be seen from Examples 1-3 that with the continuous increase in the proportion of tourmaline powder and titanium dioxide components, the long-term release of negative ions and the anti-oil performance of the high-pressure plastic wood board are significantly improved. Tourmaline powder releases negative ions through spontaneous polarization, and increasing the proportion directly increases the polarization points per unit area. Titanium dioxide, as a photocatalyst, can decompose oily aerosols through photogenerated electron-hole pairs and reduce the physical adsorption of oil on the tourmaline surface. Therefore, the synergistic effect of tourmaline powder and titanium dioxide effectively improves the long-term release of negative ions and the anti-oil performance of the high-pressure plastic wood board.

[0030] As can be seen from Examples 3 and 4, with the decrease in the partial pressure of tridecafluorohexyltrimethoxysilane, the long-term negative ion release performance and anti-oil stain performance of the high-pressure plastic-wood board are significantly reduced. Tridecafluorohexyltrimethoxysilane forms an oil-repellent layer on the surface of the catalytic layer through chemical vapor deposition. Due to the extremely low surface energy of the perfluoroalkyl chain, it is difficult for oily aerosols to wet the surface, thereby reducing the adhesion of oil stains on the surface. However, the decrease in partial pressure leads to a decrease in the concentration of silane molecules in the gas phase, resulting in a slow diffusion rate in the fluidized bed. During the deposition process, a discontinuous or uneven-thickness film layer is easily formed, weakening the oil-repellent effect, and thus leading to the simultaneous deterioration of the anti-oil stain and negative ion release performances.

[0031] According to the above test experiments, a high-pressure plastic-wood board capable of releasing negative ions prepared according to Example 3 has the optimal performance. Therefore, Example 3 is taken as the optimal example. As can be seen from the comparison between Example 3 and Comparative Examples 1-3: In Comparative Example 1, tourmaline powder was directly used to prepare a high-pressure plastic-wood board by physically mixing it with the raw materials of the plastic-wood masterbatch without the preparation step of the negative ion releasing agent. The long-term negative ion release performance and anti-oil stain effect of the high-pressure plastic-wood board are poor. The uncoated tourmaline powder is directly exposed to the oil stain environment, and the grease is adsorbed on the surface of the tourmaline through van der Waals forces and hydrophobic interactions, blocking its microporous structure and covering the polarization active sites, resulting in the blocking of the negative ion release channel. At the same time, lacking the protection of the catalytic layer and the oil-repellent layer, the grease cannot be decomposed or repelled. Therefore, the negative ion release is high at the initial stage but decays rapidly, and the anti-oil stain property is extremely poor.

[0032] In Comparative Example 2, negative ion balls and an oil-repellent layer were directly used without modifying the negative ion balls and the oil-repellent layer through the catalytic layer. The long-term negative ion release performance and anti-oil stain effect of the high-pressure plastic-wood board are poor. The negative ion balls provide channels to release negative ions. Although the hydrophobic adsorption layer can delay the adhesion of oil stains, after long-term use, the grease will still diffuse into the interior of the negative ion balls. Without the catalytic layer inside, the grease cannot be photocatalytically degraded, and the surface of the tourmaline is covered, blocking the negative ion diffusion channel, thereby affecting the long-term negative ion release performance.

[0033] In Comparative Example 3, negative ion balls and a catalytic layer were directly used without modifying the negative ion balls and the catalytic layer through the oil-repellent layer. The long-term negative ion release performance and anti-oil stain effect of the high-pressure plastic-wood board are poor. Although the catalytic layer can decompose oil stains, the surface energy of the unmodified catalytic layer is high, resulting in the rapid wetting of the surface by grease, forming a continuous oil film that blocks the contact between the tourmaline and the air. At the same time, the long-chain fatty acids in the oil stain combine with the surface hydroxyl groups of titanium dioxide, passivating the catalytic active sites, poisoning the catalytic layer, and thus greatly reducing the long-term negative ion release performance and anti-oil stain effect.

[0034] In summary, the negative ion ball serves as a carrier to provide mechanical strength and maintain the negative ion release channels. The catalytic layer dynamically removes oil stains through the adsorption-degradation path, while the oil-repellent layer repels oil stains through its low surface energy. The combination of the two forms a "passive + active" dual protection, significantly enhancing the long-term effectiveness and oil stain resistance of negative ion release.

[0035] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A high-voltage plastic-wood board capable of releasing negative ions, characterized in that: The high-pressure plastic wood board comprises pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent and zinc stearate; Among them, the negative ion releasing agent is prepared by loading a catalytic layer and an oil-repellent layer on a negative ion ball.

2. The high-voltage plastic-wood board capable of releasing negative ions according to claim 1, characterized in that, The preparation method of the negative ion releasing agent is as follows: Mix alumina powder, tourmaline powder and silica sol evenly, press them into spherical particles with a diameter of 1-1.5 mm under a pressure of 20-30 MPa in a dry pressing machine, then place them in a box-type sintering furnace and sinter at 450-455 °C for 2-3 h, with a heating rate of 5 °C / min, and cool naturally to room temperature to obtain a negative ion ball; Mix activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate and disperse them in polyvinyl alcohol to obtain a mixed slurry. Spray the mixed slurry ultrasonically on the surface of the negative ion ball 2-3 times, with a frequency of 35-40 kHz, a power of 200-300 W, a carrier gas pressure of 0.2-0.3 MPa, a spraying rate of 1-5 mL / min, and then dry and cure at 30-40 °C to obtain a catalytic layer; Dry-mix high-density polyethylene, nano-silica and nano-mica flakes, place them in a fluidized bed and melt-coat them on the surface of the catalytic layer. The inlet air temperature is 55-60 °C, the fluidization wind speed is 1-3 m / s, the spray gun temperature is 155-160 °C, the spraying rate is 5 g / min. After spraying, maintain at 70-80 °C for 5 min, then cool down to 60-65 °C for curing. After curing, in a vacuum reaction chamber, introduce vapor of tridecafluorohexyltrimethoxysilane carried by nitrogen carrier gas, control the partial pressure of tridecafluorohexyltrimethoxysilane to be 0.03-0.05 Pa, the carrier gas flow rate to be 0.5-1 L / min, carry out vapor deposition for 1.5-2 h, with a vacuum degree of 0.2-0.3 Pa and a temperature of 70-75 °C to form an oil-repellent layer, and obtain a negative ion releasing agent.

3. The high-voltage plastic-wood board capable of releasing negative ions according to claim 2, wherein: The mass ratio of the alumina powder, tourmaline powder and silica sol is 6.5-7.2:1.5-2:

1.

4. The high-voltage plastic-wood board capable of releasing negative ions according to claim 2, characterized in that: The silica content in the silica sol is 26-33%.

5. The high-voltage plastic-wood board capable of releasing negative ions according to claim 2, wherein: The mass ratio of the activated carbon powder, titanium dioxide, β-cyclodextrin and ammonium bicarbonate is 5.7-6.1:2-2.5:2:0.7-0.

9.

6. The high-voltage plastic-wood board capable of releasing negative ions according to claim 2, characterized in that: The solid content of the mixed slurry is 35-45%.

7. The high-voltage plastic-wood board capable of releasing negative ions according to claim 2, wherein: The mass ratio of the high-density polyethylene, nano-silica and nano-mica flakes is 8.3-8.5:1-1.5:0.

5.

8. A preparation process of a high-voltage plastic-wood board capable of releasing negative ions, which is used to prepare the high-voltage plastic-wood board capable of releasing negative ions described in any one of claims 1-7, and is characterized in that, It includes the following steps: Mix pine wood powder, high-density polyethylene, maleic anhydride grafted polyethylene, negative ion releasing agent, silane coupling agent, and zinc stearate in a high-speed mixer at 800 - 1000 rpm for 5 - 8 minutes, and then place it in a twin-screw extruder. The temperature of the first zone is 130 - 140 °C, the temperature of the second zone is 160 - 170 °C, the temperature of the third zone is 165 - 175 °C, and the temperature of the die head is 155 - 165 °C. The vacuum degree of the exhaust section of the extruder is -0.1 MPa to obtain a wood-plastic masterbatch. Place the wood-plastic masterbatch in a hot-press mold, apply a pressure of 15 - 20 MPa, set the temperature at 175 - 185 °C, and keep the pressure for 8 - 12 minutes. Then, cool it to 100 - 110 °C under pressure by air cooling, and then cool it to 40 - 50 °C by water cooling, and demold to obtain a high-pressure wood-plastic board capable of releasing negative ions.

9. The preparation method of the high-voltage plastic-wood board capable of releasing negative ions according to claim 8, characterized in that: The pine wood powder is 45 - 50 parts by weight, the high-density polyethylene is 32 - 38 parts by weight, the maleic anhydride grafted polyethylene is 1 - 5 parts by weight, the negative ion releasing agent is 4 - 8 parts by weight, the silane coupling agent is 0.5 - 1 part by weight, and the zinc stearate is 0.3 - 0.5 part by weight.

10. Application of a high-pressure wood-plastic board capable of releasing negative ions according to any one of claims 1 - 7 in a floor.

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