CN111040339A - Diatom ooze wood-plastic wallboard and preparation method thereof - Google Patents
Diatom ooze wood-plastic wallboard and preparation method thereof Download PDFInfo
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
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- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
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- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
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- C08K3/20—Oxides; Hydroxides
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Abstract
The embodiment of the invention discloses a diatom ooze wood-plastic wallboard and a preparation method thereof, wherein the diatom ooze wood-plastic wallboard comprises PVC resin powder, plant fiber powder, modified diatom ooze powder and auxiliary additives, the auxiliary additives comprise a coupling agent, a foaming agent, an environment-friendly stabilizer, a processing aid, a lubricant and a toughening agent, and the modified diatom ooze is diatom ooze loaded with nano titanium dioxide; the preparation method comprises the following steps: activating plant fiber powder and modified diatomite powder, mixing the powder and extruding for molding; the embodiment of the invention carries out activation treatment on the modified diatom ooze powder to ensure that the diatom ooze powder is compatible with the interface of the PVC resin powder, and solves the problem of high concentration of formaldehyde pollutants for indoor decoration in the prior art by adsorbing formaldehyde in the air through the modified diatom ooze and decomposing and absorbing the formaldehyde through the photocatalysis of the nano titanium dioxide.
Description
Technical Field
The embodiment of the invention relates to the technical field of decorative materials, and particularly relates to a diatom ooze wood-plastic wallboard and a preparation method thereof.
Background
According to the data of the environment detection center of the China interior decoration Association, the number of deaths caused by interior decoration pollution is 13.1 ten thousand every year in China, and the number is staggering. Among them, formaldehyde is one of the main sources of indoor environmental pollution, usually comes from artificial boards, adhesives, wallpaper and other materials, is a worldwide recognized potential carcinogen, and can also cause fetal malformation. However, no good treatment method is available at present for eliminating formaldehyde pollutants caused by indoor decoration. The windowing ventilation can only temporarily reduce the concentration of formaldehyde pollutants, and often cannot window for a long time, and more importantly, formaldehyde pollution sources continuously release formaldehyde, so that indoor pollution is difficult to radically treat.
As a novel environment-friendly decorative material, the wood-plastic wallboard is widely applied to the field of interior decoration of industrial buildings and public buildings. Therefore, the formaldehyde pollution can be radically treated only by thoroughly starting from the source of the formaldehyde pollution and developing an environment-friendly interior decoration material capable of removing formaldehyde.
Disclosure of Invention
Therefore, the embodiment of the invention provides a diatom ooze wood-plastic wallboard and a preparation method thereof, modified diatom ooze powder is subjected to activation treatment to be compatible with the interface of PVC resin powder, and the problem of high concentration of formaldehyde pollutants for indoor decoration in the prior art is solved by adsorbing formaldehyde in the air through the modified diatom ooze and decomposing the absorbed formaldehyde through the photocatalysis of nano titanium dioxide.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the utility model provides a diatom ooze wood-plastic wallboard, includes PVC resin powder, vegetable fiber powder, modified diatom ooze powder and auxiliary additive, the auxiliary additive includes coupling agent, foamer, environmental protection stabilizer, processing auxiliary agent, lubricant and toughening agent, just modified diatom ooze is the diatom ooze that has nanometer titanium dioxide of load.
The embodiment of the invention is further characterized in that the content of the PVC resin powder is 30-45 parts by weight, the content of the plant fiber powder is 10-40 parts by weight, the content of the diatom ooze powder is 20-30 parts by weight, the content of the coupling agent is 0.3-2 parts by weight, the content of the foaming agent is 1-3 parts by weight, the content of the environment-friendly stabilizer is 2-6 parts by weight, the content of the processing aid is 1-3 parts by weight, the content of the lubricant is 1-3 parts by weight, and the content of the toughening agent is 1-5 parts by weight.
An embodiment of the present invention is also characterized in that,
the coupling agent is any one or a mixture of a silane coupling agent, a titanate coupling agent and a maleic anhydride coupling agent;
the environment-friendly stabilizer is a calcium-zinc composite environment-friendly stabilizer;
the mesh number of the diatom ooze is more than 2000 meshes;
the foaming agent is one or the combination of azodicarbonamide and sodium bicarbonate;
the processing aid is any one or a mixture of dioctyl and ACR resin;
the lubricant is any one or a mixture of polyethylene wax and oxidized polyethylene wax;
the toughening agent is acrylate.
The embodiment of the invention also provides a preparation method of the diatom ooze wood-plastic wallboard, which comprises the following steps:
s100, activating plant fiber powder and modified diatomite powder, namely adding the plant fiber powder and the modified diatomite powder into a high-speed mixer, stirring and mixing, then adding a coupling agent, and continuously stirring to obtain activated plant fiber powder and modified diatomite powder;
s200, mixing powder, namely mixing the activated plant fiber powder and the modified diatomite powder with PVC resin powder and an auxiliary additive at a high speed, cooling and putting the mixture into a charging barrel to obtain mixed powder;
s300, extrusion molding, namely adding the mixed powder into an extruder, heating, extruding, and carrying out calendaring molding to finish traction and cutting.
An embodiment of the present invention is also characterized in that,
in the step S100, the mixing temperature of the high-speed mixer is 100-120 ℃, the rotating speed is 800-1500 rpm, the ratio of the plant fiber powder, the modified diatomite powder and the coupling agent is 100g: 1-4 g, and the stirring time for adding the coupling agent is 5-10 min;
in the step 200, the mixing temperature is 110-130 ℃, the mixing time is 15-30 min, and the cooling temperature is 40-60 ℃;
in the step 300, the extrusion temperature of the mixed powder is 120-180 ℃, the barrel temperature of an extruder is 130-180 ℃, the die temperature is 130-200 ℃, the rotation speed of a main engine is 10-30 rpm, and the feeding rotation speed is 10-25 rpm.
The embodiment of the present invention is further characterized in that, in step S100, the preparation process of the modified diatom ooze powder specifically includes:
s101, primarily purifying the diatomite to remove impurities on the outer surface of the diatomite to obtain refined diatomite;
s102, loading the nano titanium dioxide on the diatomite to obtain a nano titanium dioxide/diatomite composite material;
s103, secondarily purifying the nano titanium dioxide/diatomite composite material to remove impurities in the micropores of the diatomite, and obtaining modified diatomite powder.
The embodiment of the invention is further characterized in that the preliminary purification of the diatomite in the step 101 comprises the following specific steps:
s1011, drying the diatomite raw ore to the moisture content of 0-2%, and then crushing the diatomite by using a cyclone separator to obtain fine diatomite;
s1012, soaking fine diatomite for 5-6 hours, adding water and a dispersing agent NaOH to enable the slurry concentration to reach 40%, stirring and scrubbing to separate clastic minerals and clay minerals from diatomite, and respectively precipitating sand-grade coarse soil, suspension-grade clay and fine diatomite;
and S1013, repeating the step S1012 for three times, wherein the scrubbing time is about 40-50 min each time, the settling time of the sand-grade coarse soil is 6-8 min, and the settling time of the diatomite is 6-7 h.
The embodiment of the invention is further characterized in that the specific steps of loading the nanometer titanium dioxide on the diatomite in the step 102 are as follows:
s1021, preparing 0.02mol/L TiOSO4Adding a proper amount of diatomite into the solution and 25% ammonia water solution, uniformly mixing and stirring the reactants, then dropwise adding concentrated sulfuric acid, keeping the pH value of the solution stable at 1.5, heating the mixed solution in a water bath to 70 ℃, stirring, cooling, and filtering to obtain a precipitate;
s1022, washing the precipitate with deionized water for multiple times, and dropwise adding BaCl2Detecting the washing solution by the solution, and stopping washing until turbidity does not appear any more;
s1023, standing and drying the washed precipitate, and then baking the precipitate in a muffle furnace at 600-800 ℃ to obtain the nano titanium dioxide/diatomite composite material.
The embodiment of the present invention is further characterized in that, in step S1013, the secondary purification of the nano titanium dioxide/diatomite composite material comprises the following specific steps:
s1031, preparing 38 +/-2% sulfuric acid solution, and preparing the nano titanium dioxide/diatomite composite material according to the weight ratio: adding the sulfuric acid solution into an acid leaching container filled with the nano titanium dioxide/diatomite composite material under the condition of continuously stirring the sulfuric acid solution with the dosage of 1: 1;
s1032, introducing steam into the acid leaching container to heat the acid leaching container to 100-110 ℃, placing the bottom of the acid leaching container in an ultrasonic oscillator, wherein the oscillation frequency is 40Hz, and carrying out heat preservation oscillation for 4 hours;
s1033, cooling the acid leaching slurry in the acid leaching container, transferring the cooled acid leaching slurry into a filtering device for filtering, and then adding water into the filtering device to wash the filter cake until the pH value of the washing water is 7;
s1034, drying the filter cake at 100 ℃, and then crushing to over 2000 meshes for later use to obtain the modified diatomite powder.
The embodiment of the invention has the following advantages:
(1) according to the diatom ooze wood-plastic wallboard prepared by the embodiment of the invention, the addition of the modified diatom ooze enables the wood-plastic wallboard to have the effects of dehumidification, deodorization, flame retardance, heat preservation and sound insulation, meanwhile, formaldehyde in air can be adsorbed through the porous structure of the modified diatom ooze, and the adsorbed formaldehyde can be decomposed through the photocatalysis of the loaded nano titanium dioxide, so that the diatom ooze wood-plastic wallboard has the effect of purifying air, is an excellent environment-friendly indoor decoration material, and meets the requirements of people on the environment protection and the health of living environments;
(2) according to the embodiment of the invention, the plant fiber powder and the diatom ooze powder are subjected to activation treatment, so that the interface compatibility of the diatom ooze powder and the PVC resin powder is improved, and the processability is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flow chart of a preparation method of a diatom ooze wood-plastic wallboard provided by the embodiment of the invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
The invention provides a diatom ooze wood-plastic wallboard which comprises PVC resin powder, plant fiber powder, modified diatom ooze powder and auxiliary additives, wherein the auxiliary additives comprise a coupling agent, a foaming agent, an environment-friendly stabilizer, a processing aid, a lubricant and a toughening agent, and the modified diatom ooze is diatom ooze loaded with nano titanium dioxide.
Specifically, the PVC resin powder comprises 30-45 parts by weight of PVC resin powder, 10-40 parts by weight of plant fiber powder, 20-30 parts by weight of diatom ooze powder, 0.3-2 parts by weight of coupling agent, 1-3 parts by weight of foaming agent, 2-6 parts by weight of environment-friendly stabilizer, 1-3 parts by weight of processing aid, 1-3 parts by weight of lubricant and 1-5 parts by weight of toughening agent.
Wherein the coupling agent is any one or a mixture of a silane coupling agent, a titanate coupling agent and a maleic anhydride coupling agent;
the environment-friendly stabilizer is a calcium-zinc composite environment-friendly stabilizer;
the mesh number of the diatom ooze is more than 2000 meshes;
the foaming agent is one or the combination of azodicarbonamide and sodium bicarbonate;
the processing aid is any one or a mixture of dioctyl and ACR resins;
the lubricant is any one or a mixture of polyethylene wax and oxidized polyethylene wax;
the toughening agent is acrylate.
As shown in fig. 1, an embodiment of the present invention further provides a preparation method of a diatom ooze wood-plastic wallboard, comprising the following steps:
s100, activating plant fiber powder and modified diatomite powder, namely adding the plant fiber powder and the modified diatomite powder into a high-speed mixer, stirring and mixing, then adding a coupling agent, and continuously stirring to obtain activated plant fiber powder and modified diatomite powder;
s200, mixing powder, namely mixing the activated plant fiber powder and the modified diatomite powder with PVC resin powder and an auxiliary additive at a high speed, cooling and putting the mixture into a charging barrel to obtain mixed powder;
s300, extrusion molding, namely adding the mixed powder into an extruder, heating, extruding, and carrying out calendaring molding to finish traction and cutting.
In the preparation process, the reaction conditions of the steps are as follows:
in the step S100, the mixing temperature of the high-speed mixer is 100-120 ℃, the rotating speed is 800-1500 rpm, the ratio of the plant fiber powder, the modified diatomite powder and the coupling agent is 100g: 1-4 g, and the stirring time for adding the coupling agent is 5-10 min;
in the step 200, the mixing temperature is 110-130 ℃, the mixing time is 15-30 min, and the cooling temperature is 40-60 ℃;
in the step 300, the extrusion temperature of the mixed powder is 120-180 ℃, the barrel temperature of an extruder is 130-180 ℃, the die temperature is 130-200 ℃, the rotation speed of a main engine is 10-30 rpm, and the feeding rotation speed is 10-25 rpm.
Aiming at the addition of the coupling agent in the step S100, the aim is to perform activation treatment on the plant fiber powder and the diatom ooze powder, improve the interface compatibility of the plant fiber powder and the diatom ooze powder, promote the mutual adhesion in the processing process of the plant fiber powder and the diatom ooze powder and greatly improve the processing performance.
The preparation process of the modified diatomite powder specifically comprises the following steps:
s101, primarily purifying the diatomite to remove impurities on the outer surface of the diatomite to obtain refined diatomite;
s102, loading the nano titanium dioxide on the diatomite to obtain a nano titanium dioxide/diatomite composite material;
s103, secondarily purifying the nano titanium dioxide/diatomite composite material to remove impurities in the micropores of the diatomite, and obtaining modified diatomite powder.
Traditional diatom ooze powder is after getting rid of the impurity of its surface and in the hole with diatom mud, with nanometer titanium dioxide load realize on diatom mud that diatom mud both can absorb formaldehyde and can decompose the effect of formaldehyde, but at nanometer titanium dioxide load's in-process, when the load was too big, nanometer titanium dioxide probably blockked up the hole on the diatom mud to influence the absorption of formaldehyde.
Based on the preparation process of the modified diatomite powder, the embodiment of the invention is characterized in that the diatomite is subjected to secondary purification, firstly, impurities on the outer surface of the diatomite are removed, then the loading of the nano titanium dioxide is completed, the nano titanium dioxide is loaded on the surface of the diatomite, and then, the nano titanium dioxide/diatomite composite material is subjected to secondary purification to remove the impurities in micropores of the diatomite, so that the nano titanium dioxide is prevented from blocking pores on the diatomite. The first step is to absorb and fix formaldehyde through the pores of the diatomite, and the second step is to decompose the absorbed formaldehyde through the nano titanium dioxide on the surface of the diatomite.
Specifically, the preliminary purification of diatomite in step 101 includes the following steps:
s1011, drying the diatomite raw ore to the moisture content of 0-2%, and then crushing the diatomite by using a cyclone separator to obtain fine diatomite;
s1012, soaking fine diatomite for 5-6 hours, adding water and a dispersing agent NaOH to enable the slurry concentration to reach 40%, stirring and scrubbing to separate clastic minerals and clay minerals from diatomite, and respectively precipitating sand-grade coarse soil, suspension-grade clay and fine diatomite;
and S1013, repeating the step S1012 for three times, wherein the scrubbing time is about 40-50 min each time, the settling time of the sand-grade coarse soil is 6-8 min, and the settling time of the diatomite is 6-7 h.
The primary purification is mainly based on scrubbing purification in the prior art, raw material particles are finely ground by scrubbing, mineral impurities such as clay and the like which are solidified on the diatom shells are separated as much as possible, conditions are created for separation and purification, and then according to different properties and particle ranges of various minerals, wherein the quartz mud, iron-containing minerals, sand and other clastic minerals have large particles and can be separated out firstly due to fast sedimentation, the clay mineral montmorillonite is dispersed into very small particles by stirring and scrubbing, has the same negative charge with the diatomite and repels with each other in the same polarity, therefore, the suspension property and the dispersibility are good, so that the dispersion agent such as sodium hydroxide can be added into the slurry to strengthen the suspension property and the dispersibility of the montmorillonite, the montmorillonite particles are difficult to precipitate, the sedimentation rate of the diatomite particles in the slurry is much higher than that of the montmorillonite particles, and the refined diatomite mainly containing diatomite can be obtained by separating the suspension mainly containing montmorillonite.
According to the embodiment of the invention, one-step drying and crushing is added before scrubbing and purification, so that the problem that the large-particle diatomite is not easy to break in the scrubbing process, so that the whole diatomite is quickly precipitated and then is separated as a fragment mineral, and the yield loss of the diatomite is caused is avoided.
The specific steps of loading the nanometer titanium dioxide on the diatomite in the step 102 are as follows:
s1021, preparing 0.02mol/L TiOSO4Adding a proper amount of diatomite into the solution and 25% ammonia water solution, uniformly mixing and stirring the reactants, then dropwise adding concentrated sulfuric acid, keeping the pH value of the solution stable at 1.5, heating the mixed solution in a water bath to 70 ℃, stirring, cooling, and filtering to obtain a precipitate;
s1022, washing the precipitate with deionized water for multiple times, and dropwise adding BaCl2Detecting the washing solution by the solution, and stopping washing until turbidity does not appear any more;
s1023, standing and drying the washed precipitate, and then baking the precipitate in a muffle furnace at 600-800 ℃ to obtain the nano titanium dioxide/diatomite composite material.
The above process is a precipitation method to prepare the nano titanium dioxide/diatomite composite material, and can also adopt other methods such as a sol-gel method to prepare the nano titanium dioxide/diatomite composite material, and the purpose of baking at the temperature of 600-800 ℃ in S1023 is to dry the nano titanium dioxide/diatomite composite material on one hand and bake at the temperature of 600-800 ℃ on the other handAt 600-800 deg.C, SiO is generated due to the volatilization of organic matters2The content can be obviously improved, the aperture is increased, and the surface acid strength is increased. Research shows that the specific surface area reaches the maximum when the temperature is over 450 ℃ and the diatom shells are damaged when the roasting temperature reaches over 900 ℃, so that the roasting at the temperature of 600-800 ℃ is preferred.
In step S1013, the secondary purification of the nano titanium dioxide/diatomite composite material comprises the following specific steps:
s1031, preparing 38 +/-2% sulfuric acid solution, and preparing the nano titanium dioxide/diatomite composite material according to the weight ratio: adding the sulfuric acid solution into an acid leaching container filled with the nano titanium dioxide/diatomite composite material under the condition of continuously stirring the sulfuric acid solution with the dosage of 1: 1;
s1032, introducing steam into the acid leaching container to heat the acid leaching container to 100-110 ℃, placing the bottom of the acid leaching container in an ultrasonic oscillator, wherein the oscillation frequency is 40Hz, and carrying out heat preservation oscillation for 4 hours;
s1033, cooling the acid leaching slurry in the acid leaching container, transferring the cooled acid leaching slurry into a filtering device for filtering, and then adding water into the filtering device to wash the filter cake until the pH value of the washing water is 7;
s1034, drying the filter cake at 100 ℃, and then crushing to over 2000 meshes for later use to obtain the modified diatomite powder.
The secondary purification adopts an acid leaching method, wherein the acid leaching is to react acid with impurities such as clay in diatomite to generate soluble salt, and then the soluble salt is filtered, washed and dried to achieve the purpose of purification, but the conventional acid leaching method for purifying the impurities such as the acid and the clay in the diatomite needs to react at a high temperature for a long time, which is not beneficial to industrial production.
The following table lists the component ratios of the diatom ooze wood-plastic wallboard prepared in different embodiments:
| components | Example 1 (parts by weight) | Example 2 (parts by weight) | Example 3 (parts by weight) | Example 4 (parts by weight) |
| PVC resin powder | 30 | 35 | 40 | 45 |
| Plant fiber powder | 35 | 30 | 23 | 20 |
| Modified diatom ooze powder | 23 | 27 | 25 | 26.5 |
| Foaming agent | 2 | 1 | 2 | 2 |
| Environment-friendly stabilizer | 4 | 2 | 3 | 2 |
| Coupling agent | 0.5 | 1 | 2 | 1.5 |
| Processing aid | 1.5 | 1.0 | 1.0 | 1.0 |
| Lubricant agent | 2.0 | 1.0 | 1.0 | 1.0 |
| Toughening agent | 2.0 | 2.0 | 3.0 | 1.0 |
The above prepared material of example 4 was processed as follows:
(1) drying the plant fiber powder and the modified diatom ooze powder at the temperature of 110 ℃ to ensure that the water content is less than 1%;
(2) adding the dried plant fiber powder and the modified diatomite powder into a high-speed mixer, stirring and mixing at a high speed of 120 ℃, wherein the rotating speed of the high-speed mixer is 1500 revolutions per minute, and adding a coupling agent according to the ratio of 100g of the plant fiber powder, the modified diatomite powder and the coupling agent to 4g of the plant fiber powder, the modified diatomite powder and the coupling agent, and continuing stirring for 10 min;
(3) mixing the activated plant fiber obtained in the step (2), the modified diatomite powder, the PVC resin powder and the auxiliary additive at a high speed at 130 ℃ for 30min, cooling to 60 ℃, and putting into a charging barrel to obtain mixed powder;
(4) adding the mixed powder into an extruder, heating to 80 ℃ for extrusion, wherein the barrel temperature of the extruder is 180 ℃, the die temperature is 200 ℃, the rotating speed of a main machine is 30 revolutions per minute, and the feeding rotating speed is 25 revolutions per minute.
(5) And performing calendaring molding, drawing and cutting after extrusion.
The following table shows the results of the test of the physical and mechanical properties of the wood-plastic board obtained in example 4:
the wood-plastic wallboard prepared by the embodiment of the invention is far higher than the physical and chemical performance index of the Chinese standard GB/T24137 for the wood-plastic composite material, the size stability is greatly improved, and the problem that the wood-plastic wallboard is easy to deform in the using process is solved.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. The utility model provides a diatom ooze wood-plastic wallboard, its characterized in that includes PVC resin powder, vegetable fibre powder, modified diatom ooze powder and auxiliary additive, the auxiliary additive includes coupling agent, foamer, environmental protection stabilizer, processing auxiliary agent, lubricant and toughening agent, just modified diatom ooze is the diatom ooze that has nanometer titanium dioxide of load.
2. The diatom ooze wood-plastic wallboard of claim 1, wherein the content of PVC resin powder is 30-45 parts by weight, the content of plant fiber powder is 10-40 parts by weight, the content of diatom ooze powder is 20-30 parts by weight, the content of coupling agent is 0.3-2 parts by weight, the content of foaming agent is 1-3 parts by weight, the content of environment-friendly stabilizer is 2-6 parts by weight, the content of processing aid is 1-3 parts by weight, the content of lubricant is 1-3 parts by weight, and the content of toughening agent is 1-5 parts by weight.
3. The diatom ooze wood-plastic wallboard of claim 1,
the coupling agent is any one or a mixture of a silane coupling agent, a titanate coupling agent and a maleic anhydride coupling agent;
the environment-friendly stabilizer is a calcium-zinc composite environment-friendly stabilizer;
the mesh number of the diatom ooze is more than 2000 meshes;
the foaming agent is one or the combination of azodicarbonamide and sodium bicarbonate;
the processing aid is any one or a mixture of dioctyl and ACR resin;
the lubricant is any one or a mixture of polyethylene wax and oxidized polyethylene wax;
the toughening agent is acrylate.
4. A method for preparing a diatom ooze wood-plastic wallboard according to any one of claims 1-3, comprising the steps of:
s100, activating plant fiber powder and modified diatomite powder, namely adding the plant fiber powder and the modified diatomite powder into a high-speed mixer, stirring and mixing, then adding a coupling agent, and continuously stirring to obtain activated plant fiber powder and modified diatomite powder;
s200, mixing powder, namely mixing the activated plant fiber powder and the modified diatomite powder with PVC resin powder and an auxiliary additive at a high speed, cooling and putting the mixture into a charging barrel to obtain mixed powder;
s300, extrusion molding, namely adding the mixed powder into an extruder, heating, extruding, and carrying out calendaring molding to finish traction and cutting.
5. The method for preparing diatom ooze wood-plastic wallboard according to claim 1,
in the step S100, the mixing temperature of the high-speed mixer is 100-120 ℃, the rotating speed is 800-1500 rpm, the ratio of the plant fiber powder, the modified diatomite powder and the coupling agent is 100g: 1-4 g, and the stirring time for adding the coupling agent is 5-10 min;
in the step 200, the mixing temperature is 110-130 ℃, the mixing time is 15-30 min, and the cooling temperature is 40-60 ℃;
in the step 300, the extrusion temperature of the mixed powder is 120-180 ℃, the barrel temperature of an extruder is 130-180 ℃, the die temperature is 130-200 ℃, the rotation speed of a main engine is 10-30 rpm, and the feeding rotation speed is 10-25 rpm.
6. The method for preparing the diatom ooze wood-plastic wallboard according to claim 4, wherein in step S100, the preparation process of the modified diatom ooze powder specifically comprises the following steps:
s101, primarily purifying the diatomite to remove impurities on the outer surface of the diatomite to obtain refined diatomite;
s102, loading the nano titanium dioxide on the diatomite to obtain a nano titanium dioxide/diatomite composite material;
s103, secondarily purifying the nano titanium dioxide/diatomite composite material to remove impurities in the micropores of the diatomite, and obtaining modified diatomite powder.
7. The preparation method of the diatom ooze wood-plastic wallboard according to claim 6, wherein the specific steps of preliminary purification of diatomite in step 101 are as follows:
s1011, drying the diatomite raw ore to the moisture content of 0-2%, and then crushing the diatomite by using a cyclone separator to obtain fine diatomite;
s1012, soaking fine diatomite for 5-6 hours, adding water and a dispersing agent NaOH to enable the slurry concentration to reach 40%, stirring and scrubbing to separate clastic minerals and clay minerals from diatomite, and respectively precipitating sand-grade coarse soil, suspension-grade clay and fine diatomite;
and S1013, repeating the step S1012 for three times, wherein the scrubbing time is about 40-50 min each time, the settling time of the sand-grade coarse soil is 6-8 min, and the settling time of the diatomite is 6-7 h.
8. The preparation method of the diatom ooze wood-plastic wallboard of claim 6, wherein the specific steps of loading the nanometer titanium dioxide on the diatomite in step 102 are as follows:
s1021, preparing 0.02mol/L TiOSO4Adding a proper amount of diatomite into the solution and 25% ammonia water solution, uniformly mixing and stirring the reactants, then dropwise adding concentrated sulfuric acid, keeping the pH value of the solution stable at 1.5, heating the mixed solution in a water bath to 70 ℃, stirring, cooling, and filtering to obtain a precipitate;
s1022, washing the precipitate with deionized water for multiple times, and dropwise adding BaCl2Detecting the washing solution by the solution, and stopping washing until turbidity does not appear any more;
s1023, standing and drying the washed precipitate, and then baking the precipitate in a muffle furnace at 600-800 ℃ to obtain the nano titanium dioxide/diatomite composite material.
9. The method for preparing the diatom ooze wood-plastic wallboard according to claim 1, wherein in step S1013, the secondary purification of the nano titanium dioxide/diatomite composite material comprises the following specific steps:
s1031, preparing 38 +/-2% sulfuric acid solution, and preparing the nano titanium dioxide/diatomite composite material according to the weight ratio: adding the sulfuric acid solution into an acid leaching container filled with the nano titanium dioxide/diatomite composite material under the condition of continuously stirring the sulfuric acid solution with the dosage of 1: 1;
s1032, introducing steam into the acid leaching container to heat the acid leaching container to 100-110 ℃, placing the bottom of the acid leaching container in an ultrasonic oscillator, wherein the oscillation frequency is 40Hz, and carrying out heat preservation oscillation for 4 hours;
s1033, cooling the acid leaching slurry in the acid leaching container, transferring the cooled acid leaching slurry into a filtering device for filtering, and then adding water into the filtering device to wash the filter cake until the pH value of the washing water is 7;
s1034, drying the filter cake at 100 ℃, and then crushing to over 2000 meshes for later use to obtain the modified diatomite powder.
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