CN115109336A - Modified bauxite ore washing mud reinforced wood-plastic composite material and preparation method thereof - Google Patents
Modified bauxite ore washing mud reinforced wood-plastic composite material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08L27/00—Compositions 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; Compositions of derivatives of such polymers
- C08L27/02—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- C08L2201/02—Flame or fire retardant/resistant
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- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention discloses a modified bauxite ore washing mud reinforced wood-plastic composite material and a preparation method thereof, wherein the modified bauxite ore washing mud reinforced wood-plastic composite material is prepared from the following raw materials in parts by weight: 20-40 parts of natural wood fiber, 20-50 parts of polyolefin resin, 5-20 parts of bauxite ore washing mud, and 5-20 parts of auxiliary agent and additive. The modified bauxite ore washing mud reinforced wood-plastic composite material provides a new reliable way for resource utilization of the bauxite ore washing mud, saves raw materials for manufacturing the wood-plastic composite material, and has lower cost, better performance and wide development prospect.
Description
Technical Field
The invention relates to the technical field of resource utilization of solid waste-bauxite ore washing mud, in particular to a modified bauxite ore washing mud reinforced wood-plastic composite material.
Background
Wood-Plastic Composites (WPC) are a new type of composite material which has been vigorously developed in recent years at home and abroad, and refer to a board or a profile which is produced by mixing polyethylene, polypropylene, polyvinyl chloride and the like instead of a common resin adhesive with more than 50% of waste plant fibers such as Wood flour, rice hulls, straws and the like to form a new Wood material, and then carrying out Plastic processing processes such as extrusion, mould pressing, injection molding and the like. The method is mainly used in industries such as building materials, furniture, logistics packaging and the like. The board is made by mixing plastic and wood powder according to a certain proportion and then performing hot extrusion molding, and is called as an extruded wood-plastic composite board.
At present, in the wood-plastic processing industry, a plastic substrate generally selects high-density polyethylene (HDPE), polypropylene (PP), Polystyrene (PS), polyvinyl chloride (PVC) and the like with relatively low melting points, wherein the HDPE is widely applied, and the filling fiber usually selects cheap natural plant fibers with high length-diameter ratio, such as wood powder, bagasse, rice hull powder, cotton stalks and flax. In order to improve the compatibility and dispersibility of each phase material in the wood-plastic composite material, a filler, a coupling agent, a compatilizer and other additives are generally required to be added to improve the interfacial compatibility between the materials.
The bauxite ore washing mud is used as a byproduct of bauxite mining, and long-term stockpiling not only brings heavy burden to the surrounding environment, but also causes resource waste, so that a path for secondary processing and utilization of the bauxite ore washing mud is urgently needed to be found, waste is changed into valuable, and resources are saved. At present, the research on the bauxite ore washing mud at home and abroad mainly focuses on the dehydration and solidification aspects of the dehydration of the bauxite ore washing mud. The bauxite ore washing mud is recycled, and particularly, the research on preparing the wood-plastic composite material has not been reported yet.
The bauxite ore washing mud is an important inorganic mineral, the main component of the bauxite ore washing mud is silicate clay mineral with a lamellar structure, and the bauxite ore washing mud has the characteristics of good dispersibility and fine granularity, is prepared into the wood-plastic composite material, can save a large amount of stone energy materials such as resin and the like, and can improve the performance index of the composite material.
Disclosure of Invention
The invention aims to provide a modified bauxite ore washing mud reinforced wood-plastic composite material, which provides a new reliable way for resource utilization of bauxite ore washing mud, saves raw materials for manufacturing the wood-plastic composite material, and has the advantages of lower cost, better performance and wide development prospect.
The technical scheme of the invention is as follows:
the modified bauxite ore washing mud reinforced wood-plastic composite material is prepared from the following raw materials in parts by weight:
20-40 parts of natural wood fiber, 20-50 parts of polyolefin resin, 5-20 parts of bauxite ore washing mud, and 5-20 parts of auxiliary agent and additive.
The auxiliary agent and the additive are one or the combination of more than one of a coupling agent, a lubricant, a compatilizer, an anti-microbial agent, an ultraviolet stabilizer, a coloring agent, an antioxidant and a heat stabilizer.
The antibacterial agent can be nano silver antibacterial powder, the ultraviolet stabilizer can be UV-770, the colorant can be carbon black or iron oxide red, the antioxidant can be 168 (phosphite), and the heat stabilizer can be calcium stearate or zinc stearate.
The coupling agent accounts for 0.01-20% of the mass of the bauxite ore washing mud powder, the lubricant accounts for 0.5-10% of the mass of the bauxite ore washing mud powder, the compatilizer accounts for 0.05-5% of the mass of the bauxite ore washing mud powder, the antibacterial agent accounts for 0.5-3% of the mass of the bauxite ore washing mud powder, the ultraviolet stabilizer accounts for 0.2-0.8% of the mass of the bauxite ore washing mud powder, the antioxidant accounts for 0.3-1% of the mass of the bauxite ore washing mud powder, the heat stabilizer accounts for 0.5-2% of the mass of the bauxite ore washing mud powder, and the colorant accounts for 0.5-3% of the mass of the bauxite ore washing mud powder.
The lubricant is one or more of paraffin, polyethylene wax, oxidized polyethylene wax, stearic acid, stearate or fatty alcohol.
The compatilizer is one or two of Maleic Anhydride (MAH), acrylic acid and low-molecular graft compatilizers.
The coupling agent is one or a mixture of more than one of silane coupling agent, titanate coupling agent, aluminate coupling agent or rare earth coupling agent.
The natural wood fiber is fine powder which is sieved by a sieve with more than 200 meshes, and the water content is lower than 5 percent.
The natural wood fiber is one or two of cane sugar slag, sawmilling powder, bamboo powder, rice hull powder and straw powder.
The modified bauxite is washed into fine powder which is sieved by more than 500 meshes, and the main mineral component of the modified bauxite is clay mineral.
The polyolefin resin is one or two of polyethylene resin, polypropylene resin and polyvinyl chloride resin, and the molecular weight of the polyolefin resin is 10-50 ten thousand.
The preparation method of the modified bauxite ore washing mud reinforced wood-plastic composite material comprises the following steps:
(1) pretreatment of raw materials: subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at the temperature of 100 ℃ and 125 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 The powder with the granularity index of 500-1000 meshes is obtained, namely bauxite ore washing slime powder, and polyolefin resin raw material is crushed into powder with the granularity of 50-100 meshes; pulverizing natural wood fiber, sieving with 200 mesh sieve, and drying in oven at 105 deg.C for 8 hr;
(2) modifying the bauxite ore washing mud: stirring the bauxite ore washing mud powder at a high speed for 5-20min at a temperature of 60-90 ℃, then adding a coupling agent, a compatilizer and a lubricant, and continuously stirring and mixing at a high speed for 30-90min at a temperature of 70-110 ℃ to obtain modified bauxite ore washing mud powder for later use;
(3) heating polyolefin resin powder to 50-70 ℃, then adding wood fiber powder, continuing to heat to 90-100 ℃, stirring and mixing uniformly, and cooling to 30-45 ℃ to obtain a mixture for later use;
(4) high-speed mixing: and (3) mixing the powder obtained in the step (2) and the powder obtained in the step (3) according to the weight ratio of the polyolefin resin, the natural wood fiber and the bauxite ore washing mud: 20-45, 20-35 percent and 8-20 percent, adding the auxiliary agent and the additive at the same time, and uniformly mixing at 80-100 ℃;
(5) and (3) extruding and granulating: and (4) granulating the mixed material obtained in the step (4) by using a double-screw extrusion granulator at the rotating speed of 60-80r/min and the temperature of 170-.
The invention has the beneficial effects that:
the invention has the beneficial effects that:
(1) according to the invention, the bauxite ore washing mud is modified to prepare the wood-plastic composite material, so that a beneficial way for resource utilization is provided for the bauxite ore washing mud, and the manufacturing cost is saved. Especially, for red wood-plastic composite products, the color master batch can be reduced or even not used, and the production cost of the wood-plastic composite can be further saved.
(2) The preparation method provided by the invention can enable the bauxite ore washing mud powder to be better compatible with wood fiber and polyolefin matrixes and to be uniformly dispersed, and the ore washing mud has strong binding force with the polymer matrixes.
(3) The method disclosed by the invention is simple to operate, and can improve the physical and chemical performance indexes of the wood-plastic composite material, such as rigidity, heat-resistant deformation, flame retardance and the like, reduce the production cost of enterprises and improve the economic benefits of the enterprises.
Detailed Description
The present invention will be described in detail with reference to the following examples.
Example 1
The mineral washing mud reinforced polyolefin wood-plastic composite material comprises the following components:
45kg of high-density polyethylene resin (HD5502AX), 35kg of bamboo powder, 15kg of bauxite ore washing mud and 5kg of auxiliary agents and additives; the auxiliary agent and the additive comprise the following components: 1kg of silane 550 coupling agent, 3kg of polyethylene wax, 0.1kg of maleic anhydride grafted polyethylene compatilizer, 0.1kg of sodium stearate and 0.4kg of antibacterial agent; 0.1kg of ultraviolet stabilizer; 0.1 part of antioxidant, 0.1 part of heat stabilizer: 0.3 kg.
Wherein the antibacterial agent is nano silver antibacterial powder, the ultraviolet stabilizer is UV-770, the antioxidant is 168 (phosphite esters), and the heat stabilizer is calcium stearate.
The preparation method comprises the following steps:
(1) subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at 105 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 The particle size index is 800 meshes of powder, and bauxite ore washing mud powder is obtained; crushing a polyolefin resin raw material into powder with the granularity of 100 meshes; pulverizing bamboo powder to 200 mesh, and drying in oven at 105 deg.C for 6 hr;
(2) placing the pretreated bauxite ore washing mud powder into a high-speed mixer, stirring at a high speed for 5min at 90 ℃, then adding a silane 550 coupling agent, polyethylene wax, a maleic anhydride grafted polyethylene compatilizer and sodium stearate, and continuously mixing and stirring at a high speed for 60min at 105 ℃ to obtain modified bauxite ore washing mud powder;
(3) adding bamboo powder into a mixer, heating to 60 deg.C, adding high density polyethylene resin (HD5502AX) powder, further heating to 100 deg.C, mixing for 30min, cooling to 40 deg.C to obtain mixture of high density polyethylene resin (HD5502AX) and bamboo powder;
(4) putting the powder obtained in the step (2) and the step (3), bauxite ore washing mud and all the rest of the auxiliary agents and additives into a high-speed stirrer at the temperature of 100 ℃ for mixing for 30 min;
(5) the high-speed mixed materials are extruded out of a granulator by a double screw at the rotating speed of 75r/min, and master batches are produced at the temperature of 170-;
(6) and extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the master batch.
Example 2
The mineral washing mud reinforced polyolefin wood-plastic composite material comprises the following components:
45kg of high-density polyethylene resin (HD5502AX), 25kg of bamboo powder, 10kg of rice hull powder, 15kg of bauxite ore washing mud and 5kg of auxiliary agent and additive; the auxiliary agent and the additive comprise the following components in percentage by mass: 1kg of silane 550 coupling agent, 3kg of polyethylene wax, 0.2kg of maleic anhydride grafted polyethylene compatilizer, 0.1kg of sodium stearate, 0.4kg of antibacterial agent and 0.1kg of ultraviolet stabilizer; 0.15 part of antioxidant, 0.15 part of heat stabilizer: 0.25 kg.
Wherein the antibacterial agent is nano-silver antibacterial powder, the ultraviolet stabilizer is UV-770, the antioxidant is 168 (phosphite ester), and the heat stabilizer is zinc stearate.
The preparation method comprises the following steps:
(1) subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at 105 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 The particle size index is 800 meshes of powder, and bauxite ore washing mud powder is obtained; crushing a polyolefin resin raw material into powder with the granularity of 100 meshes; drying the fiber mixture of bamboo powder, rice hull powder and the like for 6 hours at 105 ℃ in an oven for later use;
(2) placing the pretreated bauxite ore washing mud powder into a high-speed mixer, stirring at a high speed for 5min at 90 ℃, then adding a silane 550 coupling agent, polyethylene wax, a maleic anhydride grafted ABS compatilizer and sodium stearate, and continuously mixing and stirring at a high speed for 60min at 105 ℃ to obtain modified bauxite ore washing mud powder;
(3) adding high-density polyethylene resin (HD5502AX) powder into a mixer, heating to 60 ℃, adding bamboo powder and rice hull powder in proportion, continuously heating to 100 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixture of high-density polyethylene resin (HD5502AX), bamboo powder and rice hull powder;
(4) putting the powder obtained in the step (2) and the step (3), the bauxite ore washing mud and the rest of all the additives and additives into a high-speed stirrer at the temperature of 100 ℃ for uniform mixing;
(5) the high-speed mixed materials are extruded by a double-screw extruder at a rotating speed of 75r/min and at a temperature of 170-220 ℃ in each section to form master batches;
(6) and extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the master batch.
Example 3
The mineral washing mud reinforced polyolefin wood-plastic composite material comprises the following components:
45kg of high-density polyethylene resin (HD5502AX), 35kg of rice hull powder, 15kg of bauxite ore washing mud and 5kg of auxiliary agents and additives; the auxiliary agent and the additive comprise the following components in percentage by mass: 1kg of silane 550 coupling agent, 2kg of polyethylene wax, 0.1kg of maleic anhydride polyethylene grafting agent, 0.1kg of sodium stearate, 0.4kg of antibacterial agent and 0.1kg of ultraviolet stabilizer; 0.13 part of antioxidant, 0.13 part of heat stabilizer: 0.3 kg.
Wherein the antibacterial agent is nano silver antibacterial powder, the ultraviolet stabilizer is UV-770, the colorant is carbon black and iron oxide red, the antioxidant is 168 (phosphite ester), and the heat stabilizer is calcium stearate and zinc stearate.
The preparation method comprises the following steps:
(1) subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at 105 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 The particle size index is 800 meshes of powder, and bauxite ore washing mud powder is obtained; crushing a polyolefin resin raw material into powder with the granularity of 100 meshes; drying the bamboo powder for later use in an oven at 105 ℃ for 6 h;
(2) placing the pretreated bauxite ore washing mud powder into a high-speed mixer, stirring at a high speed for 5min at 90 ℃, then adding a silane 550 coupling agent, polyethylene wax, a maleic anhydride grafted polypropylene compatilizer and sodium stearate, and continuously mixing and stirring at a high speed for 60min at 105 ℃ to obtain modified bauxite ore washing mud powder;
(3) adding high-density polyethylene resin (HD5502AX) powder into a mixer, heating to 60 ℃, adding rice hull powder in proportion, continuously heating to 100 ℃, uniformly mixing, and cooling to 40 ℃ to obtain a mixture of the high-density polyethylene resin (HD5502AX) and wood fibers;
(4) putting the powder obtained in the step (2) and the step (3), the bauxite ore washing mud and the rest of all the auxiliary agents and the additives into a high-speed stirrer at the temperature of 100 ℃ for uniform mixing;
(5) the high-speed mixed materials are extruded out of a granulator by a double screw at the rotating speed of 75r/min, and master batches are produced at the temperature of 170-;
(6) and extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the modified bauxite ore washing mud reinforced wood-plastic composite material 3.
Example 4
The mineral washing mud reinforced polyolefin wood-plastic composite material comprises the following components:
20kg of polypropylene resin (Yanshan petrochemical B4002), 10kg of straw powder, 10kg of sucrose slag powder, 5kg of bauxite ore washing mud and 5kg of additives and additives; the auxiliary agent and the additive comprise the following components in percentage by mass: 0.3kg of titanate coupling agent (KRTTS), 0.2kg of oxidized polyethylene wax, 0.2kg of acrylic polypropylene grafting agent, 0.2kg of paraffin and 0.025kg of antibacterial agent; 0.01kg of ultraviolet stabilizer; 0.015kg of antioxidant; thermal stabilizer: 0.25 kg.
The preparation method comprises the following steps:
(1) subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at 105 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 Powder with the granularity index of 800 meshes is obtained, and bauxite ore washing mud powder is obtained; crushing a polyolefin resin raw material into powder with the granularity of 100 meshes; drying the mixture of bamboo powder, rice hull powder and the like for 6 hours at 105 ℃ in an oven for later use;
(2) placing the pretreated bauxite ore washing mud powder into a high-speed mixer, stirring at a high speed for 5min at 90 ℃, then adding a titanate coupling agent, oxidized polyethylene wax, a polypropylene polyethylene grafting agent and paraffin, and continuously mixing and stirring at a high speed for 60min at 105 ℃ to obtain modified bauxite ore washing mud powder;
(3) adding polypropylene resin (Yanshan petrochemical B4002) powder into a mixer, heating to 50 ℃, adding the straw powder and the sucrose slag powder in proportion, continuing heating to 90 ℃, uniformly mixing, and cooling to 30 ℃ to obtain a mixture of polypropylene resin, the straw powder and the sucrose slag powder;
(4) putting the powder obtained in the step (2) and the step (3), the bauxite ore washing mud and the rest of all the additives and additives into a high-speed stirrer at the temperature of 100 ℃ for uniform mixing;
(5) the high-speed mixed materials are extruded out of a granulator by a double screw at the rotating speed of 75r/min, and master batches are produced at the temperature of 170-;
(6) and extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the modified bauxite ore washing mud reinforced wood-plastic composite material 3.
Example 5
The mineral washing mud reinforced polyolefin wood-plastic composite material comprises the following components:
50kg of polyvinyl chloride resin (Qilu petrochemical S-700), 40kg of sawmilling powder, 20kg of bauxite ore washing mud and 20kg of auxiliary agent and additive; the auxiliary agent and the additive comprise the following components in percentage by mass: 1kg of aluminate coupling agent (KRTTS), 2kg of oxidized polyethylene wax, 0.2kg of vinyl triethoxysilane and 0.6kg of antibacterial agent; 0.16kg of ultraviolet stabilizer; 0, 2kg of antioxidant; thermal stabilizer: 0.4 kg; colorant: 0.2 kg.
The antibacterial agent is nano silver antibacterial powder, the ultraviolet stabilizer is UV-770, the colorant is carbon black, the antioxidant is 168 (phosphite esters), and the heat stabilizer is calcium stearate.
The preparation method comprises the following steps:
(1) subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at 105 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 The particle size index is 800 meshes of powder, and bauxite ore washing mud powder is obtained; crushing a polyolefin resin raw material into powder with the granularity of 100 meshes; drying the sawmilling powder for later use in an oven at 105 ℃ for 6 h;
(2) placing the pretreated bauxite ore washing mud powder into a high-speed mixer, stirring at a high speed for 5min at 90 ℃, then adding an aluminate coupling agent, oxidized polyethylene wax and a vinyl silane grafting agent, and continuously mixing and stirring at a high speed for 60min at 105 ℃ to obtain modified bauxite ore washing mud powder;
(3) adding polyvinyl chloride resin (Qilu petrochemical S-700) powder into a mixer, heating to 70 ℃, adding sawmilling powder in proportion, continuously heating to 100 ℃, uniformly mixing, and cooling to 45 ℃ to obtain a mixture of the polyvinyl chloride resin and the sawmilling powder;
(4) putting the powder obtained in the step (2) and the step (3), the bauxite ore washing mud and the rest of all the auxiliary agents and the additives into a high-speed stirrer at the temperature of 100 ℃ for uniform mixing;
(5) the high-speed mixed materials are extruded out of a granulator by a double screw at the rotating speed of 75r/min, and master batches are produced at the temperature of 170-;
(6) and extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the modified bauxite ore washing mud reinforced wood-plastic composite material 3.
Experimental example 1
Comparative example 1 preparation of control group
1. Comparative example 1:
the polyolefin wood-plastic composite material comprises the following components:
48% of high-density polyethylene (HD5502AX), 40% of bamboo powder and 7% of additives and additives; the auxiliary agent and the additive comprise the following components in percentage by mass: 1% of silane 550 coupling agent, 2% of red master batch, 3% of polyethylene wax, 0.1% of maleic anhydride polyethylene grafting agent, 0.1% of sodium stearate, and 0.5% of antibacterial agent and ultraviolet stabilizer; antioxidant and heat stabilizer: 0.5 percent.
The preparation method comprises the following steps:
(1) crushing a polyolefin resin raw material into powder with the granularity of 100 meshes; pulverizing bamboo powder into powder with particle size not less than 200 meshes, and drying in oven at 105 deg.C for 6 hr.
(2) Adding the bamboo powder into a mixer, heating to 60 ℃, adding the polyolefin resin powder and all the additives and additives in proportion, further heating to 100 ℃, mixing for 30min, and cooling to 40 ℃ to obtain the polyolefin and bamboo powder mixture.
(3) And (3) performing extrusion granulation on the materials mixed at the high speed at a rotating speed of 75r/min by using a double-screw extruder, and forming master batches at the temperature of 170-.
(4) And extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the wood-plastic composite comparative example 1.
2. Comparative example 2
The polyolefin wood-plastic composite material comprises the following components:
48 percent of high-density polyethylene (HD5502AX), 30 percent of bamboo powder, 15 percent of rice hull powder and 7 percent of auxiliary agent and additive; the auxiliary agent and the additive comprise the following components in percentage by mass: 1% of silane 550 coupling agent, 3% of polyethylene wax, 0.2% of maleic anhydride polyethylene grafting agent, 2% of red master batch, 0.1% of sodium stearate, and 0.5% of antibacterial agent and ultraviolet stabilizer; antioxidant and heat stabilizer: 0.5 percent.
The preparation method comprises the following steps:
(1) crushing a high-density polyethylene raw material into powder with the granularity of 100 meshes; pulverizing bamboo powder and rice hull powder into powder with particle size not less than 200 mesh, and drying in oven at 105 deg.C for 6 hr.
(2) Adding high-density polyethylene powder into a high-speed mixer, heating to 60 ℃, adding rice hull powder, bamboo powder, all auxiliaries, additives and additives in proportion, and uniformly mixing in a high-speed mixer at 100 ℃.
(3) The material mixed at high speed is extruded by a double-screw extruder at a rotating speed of 75r/min and at a temperature of 170-220 ℃ in each section to form master batches.
(4) And extruding the manufactured master batch into a profile through a die orifice under the conditions that the rotating speed of a single-screw extruder is 65r/min and the temperature of each section is 160-200 ℃, and cooling and cutting to obtain the wood-plastic composite comparative example 2.
3. Comparative experiment and results:
the wood-plastic composite materials obtained in the examples 1-3 and the comparative examples 1-2 are compared to find that the color and luster smoothness are not obviously different, and the indexes of impact strength, tensile strength, water absorption and the like are shown in the following table according to the test of physical and mechanical properties of the wood-plastic composite material product GB/T29418-2012.
As can be seen from the mechanical property indexes, the expansibility and the flame retardancy indexes of the examples 1-3 and the comparative examples 1-2, the bauxite ore washing mud added into the wood-plastic composite material is beneficial to enhancing the impact resistance and the flame retardancy of the wood-plastic composite material and reducing the water absorption expansion effect.
Claims (10)
1. The modified bauxite washing mud reinforced wood-plastic composite material is characterized by being prepared from the following raw materials in parts by weight:
20-40 parts of natural wood fiber, 20-50 parts of polyolefin resin, 5-20 parts of bauxite ore washing mud, and 5-20 parts of auxiliary agent and additive.
2. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 1, wherein: the auxiliary agent and the additive are one or the combination of more than one of a coupling agent, a lubricant, a compatilizer, an anti-microbial agent, an ultraviolet stabilizer, a colorant, an antioxidant and a heat stabilizer.
3. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 2, wherein: the coupling agent accounts for 0.01-20% of the mass of the bauxite ore washing mud powder, the lubricating agent accounts for 0.5-10% of the mass of the bauxite ore washing mud powder, the compatilizer accounts for 0.05-5% of the mass of the bauxite ore washing mud powder, the antibacterial agent accounts for 0.5-3% of the mass of the bauxite ore washing mud powder, the ultraviolet stabilizer accounts for 0.2-0.8% of the mass of the bauxite ore washing mud powder, the antioxidant accounts for 0.3-1% of the mass of the bauxite ore washing mud powder, the heat stabilizer accounts for 0.5-2% of the mass of the bauxite ore washing mud powder, and the coloring agent accounts for 0.5-3% of the mass of the bauxite ore washing mud powder.
4. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 2 or 3, wherein:
the lubricant is one or a mixture of more than one of paraffin, polyethylene wax, oxidized polyethylene wax, stearic acid, stearate or fatty alcohol;
the compatilizer is one or two of maleic anhydride type, acrylic acid type and low molecular type grafting compatilizers.
5. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 2 or 3, wherein: the coupling agent is one or a mixture of more than one of silane coupling agent, titanate coupling agent, aluminate coupling agent or rare earth coupling agent.
6. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 1, wherein: the natural wood fiber is fine powder which is sieved by a sieve with more than 200 meshes, and the water content is lower than 5 percent.
7. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 6, wherein: the natural wood fiber is one or two of cane sugar slag, sawmilling powder, bamboo powder, rice hull powder and straw powder.
8. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 1, wherein: the modified bauxite is washed into fine powder which is sieved by more than 500 meshes, and the main mineral component of the modified bauxite is clay mineral.
9. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 1, wherein:
the polyolefin resin is one or two of polyethylene resin, polypropylene resin and polyvinyl chloride resin, and the molecular weight of the polyolefin resin is 10-50 ten thousand.
10. The modified bauxite ore washing mud reinforced wood-plastic composite material of claim 1, wherein the preparation method comprises the following steps:
(1) pretreatment of raw materials: subjecting the bauxite ore washing mud to flocculation precipitation and plate-frame filter pressing, then drying at the temperature of 100 ℃ and 125 ℃ to ensure that the water content is less than 5%, and grinding to obtain D 50 The powder with the granularity index of 500-1000 meshes is obtained, namely bauxite ore washing slime powder, and polyolefin resin raw material is crushed into powder with the granularity of 50-100 meshes; will be provided withCrushing natural wood fibers, sieving the crushed natural wood fibers by a sieve with more than 200 meshes, and drying the crushed natural wood fibers for 8 hours at 105 ℃ in an oven for later use;
(2) modifying the bauxite ore washing mud: stirring the bauxite ore washing mud powder at a high speed for 5-20min at a temperature of 60-90 ℃, then adding a coupling agent, a compatilizer and a lubricant, and continuously stirring and mixing at a high speed for 30-90min at a temperature of 70-110 ℃ to obtain modified bauxite ore washing mud powder for later use;
(3) heating polyolefin resin powder to 50-70 ℃, then adding wood fiber powder, continuing to heat to 90-100 ℃, stirring and mixing uniformly, and cooling to 30-45 ℃ to obtain a mixture for later use;
(4) high-speed mixing: and (3) mixing the powder obtained in the step (2) and the powder obtained in the step (3) according to the weight ratio of the polyolefin resin, the natural wood fiber and the bauxite ore washing mud: 20-45, 20-35 percent and 8-20 percent, adding the auxiliary agent and the additive at the same time, and uniformly mixing at 80-100 ℃;
(5) extruding and granulating: and (4) granulating the mixed material obtained in the step (4) by using a double-screw extrusion granulator at the rotating speed of 60-80r/min and the temperature of 170-.
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