CN102675714B - Plastic wood prepared from mixed plastic in household garbage and wheat straw and method thereof - Google Patents

Abstract

The invention discloses a plastic wood prepared by using mixed plastics and straw in household garbage and a method thereof, which is suitable for resource utilization of urban domestic garbage; the plastic wood is composed of the following components in mass percentage: polyethylene 32%~43% %, polypropylene 6%~8%, polyvinyl chloride 8%~14%, straw fiber 31%~43%, compatibilizer 4.5%~8.2%, coupling agent 0.4%~2.2%, light stabilizer 0.4% %~0.7%, antioxidant 0.4%~0.6%, lubricant 2.2%~4.5%, colorant 1.4%~2.2%, antistatic agent 0.3%~0.8%, deodorant bactericidal preservative 0.2%~0.4%. Among them, polyethylene, polypropylene, and polyvinyl chloride are directly from municipal solid waste; the municipal solid waste has achieved the effect of recycling and harmless treatment, reducing white pollution caused by plastics, and is conducive to creating an environmentally friendly society.

Description

Plastic wood prepared from mixed plastic and straw in domestic waste and method thereof

technical field

The invention belongs to the technical field of comprehensive utilization of resources, and in particular relates to plastic wood prepared by using mixed plastics and straw in municipal domestic garbage and a method thereof.

Background technique

With the rapid development of the country's economy, the amount of urban domestic waste has increased sharply, and the problem of waste disposal is imminent. At present, my country's waste treatment mainly adopts landfill, composting and incineration. Landfills are prone to produce landfill gas rich in CH ₄ , causing explosions, and a large amount of landfill leachate, which contains heavy metals, toxic and harmful organic chemical pollutants, and a large number of viral pathogens. In the composting method, due to poor classification of garbage, plastic, iron, glass, etc. remain in the raw materials for fertilizer making, resulting in unclean fertilizer and soil pollution. When using the incineration method to treat municipal solid waste, since the solid waste contains polyethylene, polyvinyl chloride, polypropylene, polystyrene resin and other plastics, when the waste plastic is burned, it will not only produce thick smoke and stench, but also easily produce strong irritation. Toxic gas such as destructive hydrogen chloride and highly toxic carcinogen "dioxin". "Dioxin" is difficult to monitor online and has a serious cumulative effect. It is suspended in the air for a long time. It is extremely difficult to be discharged with the air inhaled into the human body. When the "dioxin" in the body reaches a certain level, it will cause serious skin damage. It has strong carcinogenic and teratogenic effects, and also has reproductive toxicity, immunotoxicity and endocrine toxicity. Therefore, the effective recycling of plastics in municipal solid waste has become an important issue in municipal solid waste treatment.

Wood-plastic composite (WPC) is made of wood as the main raw material. After proper treatment, it is mixed with various plastics in a certain proportion and added with special additives, such as coupling agent, light stabilizer, lubricant, antioxidant, coloring, etc. It is a new type of composite material made by high temperature, extrusion, molding and other processing additives such as antistatic agent, chemical foaming agent, anti-mildew agent and preservative. The plastics used for wood-plastic composites are usually thermoplastics, mainly polyvinyl chloride, polyethylene, polypropylene, polystyrene, polymethyl methacrylate, polyethylene, polypropylene, polystyrene, etc. The main forms of wood used in wood-plastic composite materials are sawdust, wood chips, bamboo bud sugar, rice husk, wheat straw, soybean hulls, peanut shells, bagasse, cotton straw, etc.

Wood-plastic composite material is a high-performance green and environmentally friendly composite material. It has excellent performance, wide range of uses, is beneficial to environmental protection, and has broad prospects.

In the research on plastic alloys as raw materials for wood-plastic composites, most of them use unused plastics as raw materials. However, a large amount of waste plastics are not utilized in my country every year. This has caused insufficient resource utilization of waste plastics and increased production costs of plastic wood. At the same time, since there is a large amount of wheat straw fiber in our country, the resource utilization of wheat straw fiber is also very important.

Contents of the invention

The object of the present invention is to provide a plastic wood prepared by using mixed plastics and straw in municipal solid waste and its method, so as to fully utilize the waste plastics in domestic solid waste in our country.

Vinyl chloride, polyethylene, and polypropylene-based composite materials have good physical and mechanical properties and processing properties. The main technical key is to solve the dispersion and compatibility of vinyl chloride, polyethylene, and polypropylene in straw fibers.

In order to achieve the above object, the present invention adopts the following technical solutions:

A kind of plastic wood, the plastic wood is composed of the following components in mass percentage: polyethylene 32%~43%, polypropylene 6%~8%, polyvinyl chloride 8%~14%, straw fiber 31%~43%, Compatibilizer 4.5%~8.2%, coupling agent 0.4%~2.2%, light stabilizer 0.4%~0.7%, antioxidant 0.4%~0.6%, lubricant 2.2%~4.5%, colorant 1.4%~2.2% , antistatic agent 0.3%~0.8%, deodorant bactericidal preservative 0.2%~0.4%.

Preferably, the plastic wood is composed of the following mass percentage components: 36% polyethylene, 7% polypropylene, 10% polyvinyl chloride, 33% straw fiber, 5.6% compatibilizer, 1.5% coupling agent, light-stabilized 0.6% agent, 0.5% antioxidant, 3.1% lubricant, 1.8% colorant, 0.6% antistatic agent, 0.3% deodorizing, bactericidal and preservative.

Preferably, polyethylene, polypropylene and polyvinyl chloride together form a mixed plastic, and the mixed plastic is municipal solid waste through a two-stage drum sieve for bag breaking and hanging sorting and further double air chamber multifunctional air separator wind. can be selected.

Preferably, the two-stage trommel includes a fixed frame, a trommel installed on the fixed frame, and a trommel driving device; the trommel includes an interconnected trommel inlet section and a trommel outlet section; the feeding port is installed At the entrance of the trommel inlet section, there is an undersize collection device under the trommel screen; a number of screen holes are arranged in the circumferential direction of the trommel inlet section and the trommel outlet section, and a number of broken holes are installed on the inner wall of the trommel inlet section. Bag knife, a knife cleaning device matched with the bag breaking knife is provided in the entrance section of the trommel screen; a hole cleaning device for cleaning the sieve holes is provided on the outer periphery of the entrance section of the trommel screen and the exit section of the trommel screen; the inner wall of the circumference of the trommel exit section A number of long-strip hanging devices are installed, and a long-strip collection device consisting of three rows of needle chains is installed in the outlet section of the trommel screen.

Preferably, the angle between the drum screen and the horizontal direction is 3°-8°.

Preferably, the shape of the bag breaking knife is a quadrangular pyramid, one side of which is perpendicular to the bottom surface of the bag breaking knife.

Preferably, the bag breaking knife is welded on the steel plate, and the steel plate is installed on the inner wall circumference of the entrance section of the trommel in an embedded manner.

Preferably, the knife cleaning device is fixed on the disc, and its rotation direction is opposite to that of the bag breaking knife.

Preferably, the three rows of hanging needle chains include the first hanging needle chain, the second hanging needle chain and the third hanging needle chain; needle; the distance between the first hanging needle chain and the second hanging needle chain is 0.1D, and the distance between the second hanging needle chain and the third hanging needle chain is 0.12D respectively; the first hanging needle chain and the second hanging needle chain are located on the drum On one side of the screen center, the third hanging pin chain is located on the other side of the drum screen center; the third hanging pin chain is 0.07D away from the center of the drum; the length of the hanging pin is 0.25D, where D is the diameter of the drum screen.

Preferably, the double-chamber multifunctional winnowing machine includes a housing, in which a first winnowing chamber, a second winnowing chamber and a vibrating screen are arranged; a rotary feeder is arranged at the feeding port of the shell; The shell is provided with the air inlet of the first air chamber connected to the blower group under the rotary feeder; the lower part of the first air separation chamber is provided with the first two-stage air-locking discharge device near the air inlet of the first air chamber; There is a vibrating screen on the right side of a two-stage air-locking discharge device; a second two-stage air-locking discharge device is provided at the bottom of the vibrating screen; the second winnowing chamber is on the right side of the vibrating screen; the discharge port of the vibrating screen is The air inlet of the second air chamber connected to the blower unit is provided below, and the third double-stage air-locking discharge device is provided at the lower part of the second air selection chamber near the air inlet of the second air chamber, and the lower part of the second air selection chamber is far away from the second air The fourth double-stage air-locking discharge device is provided at the air inlet of the chamber; the upper part of the fourth double-stage air-lock discharge device at the rear of the second winnowing chamber is provided with a second comb plate; the first wind selection chamber is far away from the first wind The rear part of the air inlet of the chamber is provided with the first comb board and the fifth double-stage air-locking discharge device; the air outlets of the first air selection chamber and the second air selection chamber are connected to the cyclone separator through a pipeline; the cyclone separator is connected through a pipeline blower unit.

Preferably, the rotary feeder includes a rotary feed air lock device and a breaking drum located at the lower part of the rotary feed air lock device.

Preferably, the air inlet of the first air chamber and the air inlet of the second air chamber have a right-angled trapezoidal cross-section along the air inlet direction, and a rectangular cross-section perpendicular to the air inlet direction; the height of the right-angled trapezoid is equal to the length of the parallel short sides perpendicular to the height; The angle between the non-right angle side and the height is 10°-20°.

Preferably, the first two-stage air-lock discharge device, the second two-stage air-lock discharge device, the third two-stage air-lock discharge device, the fourth two-stage air-lock discharge device and the fifth two-stage air-lock discharge device The bottom of the material device is equipped with a conveyor belt.

Preferably, the vibrating screen is divided into two sections, the front section of the vibrating screen is arranged with square or circular small holes, and the rear section is a vibrating plate, which is used as a feeding device for the second air selection chamber.

Preferably, the first comb board and the second comb board contain longitudinal hollow grooves, and the double-chamber multifunctional winnowing machine for municipal solid waste further includes The first scraper, the second scraper.

Preferably, the particle diameter of the straw fiber is 20-80 mesh.

Preferably, the compatibilizer is an isocyanate compatibilizer, the coupling agent is a maleic anhydride grafted polypropylene coupling agent, the antioxidant is 2,6-di-tert-butylbenzene, and the light stabilizer is Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, stearic acid, 12-hydroxystearic acid, 9,10-dihydroxystearic acid, hard Methyl stearate, butyl stearate or methyl 2-hydroxystearate, ASA bright/matte color co-extrusion material is used as colorant, ATMER 129 is used as antistatic agent, IRGAGUARD B1000 is used as deodorizing, bactericidal and preservative agent.

A method for preparing plastic wood, comprising the following steps:

(1) Dry the straw fiber crushed to 20-80 mesh in a drying oven at 150°C for 3 hours;

(2) The municipal solid waste is bag-broken and sorted by a two-stage drum sieve and further air-separated by a double-chamber multifunctional winnowing machine to obtain polyethylene, polypropylene and polyvinyl chloride, and polyethylene is taken in proportion , polypropylene and polyvinyl chloride are washed and crushed, dried and dehydrated, and granulated to obtain mixed plastic granules with a particle size of 40-80 mesh;

(3) In a heating jacket high-speed mixer at a temperature of 150°C, first add wheat straw fiber and stir for 5 minutes, then add mixed plastic particles and other additives except compatibilizer and stir evenly, compatibilizer Add it 5 minutes before discharging, stir evenly and discharge to obtain plastic wood.

Preferably, the wood-plastic particles discharged in step (3) are granulated to obtain wood-plastic particles, and then the wood-plastic particles are extruded by a screw extruder to obtain a wood-plastic sample; during extrusion molding, the temperature of the feeding section is 140°C, the extrusion temperature is 210°C.

The present invention is a kind of plastic wood prepared by using mixed plastics and wheat straw in domestic garbage and its method, and its advantages are as follows:

(1) The mixed plastics in this formula come directly from municipal solid waste, and the mixed plastics of polyethylene, polypropylene and polyvinyl chloride are obtained through two-stage drum sieve bag breaking, hanging sorting and winnowing. The mass ratio of each component in the mixed plastic is approximately the same as the mass ratio of polyethylene, polypropylene, and polyvinyl chloride in the plastic wood of the present invention, so the mass composition of each plastic can be adjusted slightly or without adjusting the mass composition of each plastic. Wash and crush directly, dry and dehydrate, and then granulate for plastic wood production.

(2) The formula realizes the recycling of various plastics in municipal solid waste, makes municipal solid waste achieve the effect of recycling and harmless treatment, reduces white pollution caused by plastics, and is conducive to creating an environmentally friendly society.

(3) The formula can use a large amount of wheat straw fiber in my country as a filling material, realizing the resource utilization of wheat straw.

(4) The plastic-wood composite material prepared by using the formula has excellent processing performance and physical and mechanical properties, smooth surface of the product, good dispersion of straw fiber, low manufacturing cost and wide application.

(5) A two-stage trommel screen used for municipal solid waste according to the present invention organically combines the traditional bag breaking knife used alone with the large strip hanging and collecting device, realizing bag breaking and hanging And the function of collecting long strips realizes the sorting and recycling of plastic waste; the shape of the bag breaking knife is a square pyramid, and one side is perpendicular to the bottom surface of the bag breaking knife, which improves the bag breaking efficiency of the bag breaking knife; The article collection device is made up of the first hanging pin chain, the second hanging pin chain and the third hanging pin chain and three rows of hanging pin chains, and each hanging pin chain is equipped with hanging pins. Since domestic garbage falls in a parabolic shape, by calculation, three rows of needle chains are used, and the distances between the first chain and the second chain, the second chain and the third chain are 0.1D and 0.12 respectively. D. The first pin chain and the second pin chain are located on one side of the center of the drum screen, and the third pin chain is located on the other side of the center of the drum screen; the third pin chain is 0.07D away from the center of the drum, and the length of the pin is 0.25D , where D is the drum diameter. Arranged according to this, the collecting efficiency of the strip collecting device is the highest, and the economic effect is the best.

(6) The winnowing device is a two-stage winnowing, consisting of the first winnowing room and the second winnowing room. Two-stage air separation can improve the separation accuracy and ensure the purity of the separation. The air intake of the first and second winnowing rooms is uniformly controlled by the blower unit, and the two-stage winnowing rooms cooperate with each other to achieve efficient winnowing. The present invention adopts the air inlet with a right-angled trapezoidal section. The height H of a right-angled trapezoid is equal to the horizontal short side A. The angle between the non-right-angled side and the horizontal side is 10°-20°. Experiments and numerical simulations show that when the air inlets of the first and second winnowing chambers are rectangular trapezoidal sections, the flow field at the outlet is stable and there is no vortex. The invention adopts a rotary feeder, including a rotary feeding air lock device and a breaking drum. The rotary feeding air lock device realizes the separation of the first air selection chamber from the outside world to avoid gas leakage. Breaking up the drum to break up the garbage to avoid agglomeration of garbage components. The amount of feed can be effectively controlled by coordinating the control of the rotary feeder and the rotation speed of the breaking drum, and the dispersion of the garbage is conducive to the efficient separation of different components of the garbage. The bottom of the first air selection chamber of the present invention is a vibrating screen, and the vibrating screen is divided into two sections. The front section is a sieve plate with square or circular holes, and the rear section is a non-porous vibrating plate, which is used as the feed material for the second air selection chamber. device. Small pieces of inorganic matter are screened out through the vibrating sieve, and the rest of the material enters the second wind selection room with the vibrating screen. The discharge device of the present invention is a double-stage air locker, and the two-stage door is alternately opened or closed to realize no air leakage during the discharge process. The comb board of the present invention is placed at the rear of the first winnowing room and the second winnowing room, and the hollow gap of the comb board cooperates with the scraper structure to block the plastic and paper, and the plastic and paper are scraped to the outlet through the scraper. feeding device. The invention realizes the gas circulation, and the cyclone separator connects the air outlet pipe and the blower to separate the dust.

Description of drawings

The two-stage trommel screen and air separation device involved in the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic diagram of the overall structure of a two-stage trommel screen.

Fig. 2 is an axial sectional view of the inlet section of the two-stage trommel screen.

Fig. 3 is an axial sectional view of the outlet section of the two-stage trommel screen.

Fig. 4 is a structural schematic diagram of a two-stage trommel bag breaking knife.

Fig. 5 is a left side view of Fig. 4 .

Fig. 6 is a schematic diagram of a double-chamber multi-functional winnowing machine for municipal solid waste in the present invention.

Fig. 7 is a schematic diagram of the cross-sectional shape of the air inlet along the air inlet direction.

Fig. 8 is a sectional view along line A-A in Fig. 7 .

Figure 9 is a schematic diagram of a comb plate.

In the figure, 1, drum screen entrance section; 101, screen hole; 102, bag breaking knife; 103, knife cleaning device; 104, threaded hole; 105, steel plate; 2, feeding port; 3, household garbage; 4, drum Sieve drive device; 5. Exit section of trommel screen; 501. Long strip hanging device; 502, 503, 504. Needle chain; 6. Hole cleaning device; 7. Underscreen material collection device; 8. Fixed frame; 121. Blower unit; 122. Conveyor belt; 123. Second two-stage air-locking discharge device; 124. Conveyor belt; 125. First two-stage air-lock discharge device; 126. Vibrating screen; 127. Vent valve; 128. Flow 129, air inlet of the first air chamber; 1210, breaking drum; 1211, rotary feeding air locker; 1212, first winnowing room; 1213, cyclone dust collector; 1214, comb plate; , the second winnowing chamber; 1221, the air inlet of the second wind chamber; 1216, the fifth two-stage air-locking discharge device; 1219, the fourth two-stage air-lock discharge device; 1222, the third two-stage air-lock discharge Device; 1217, 1220, 1223, conveyor belt.

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments.

Example 1:

Table 1 Example 1 WPC formula

What lubricant used in plastic wood of the present invention is fatty acid and its esters, comprise stearic acid, 12-hydroxystearic acid, 9,10-dihydroxystearic acid, methyl stearate, butyl stearate, Methyl 2-Hydroxystearate.

(1) Dry the straw fiber crushed to 20-80 mesh in a drying oven at 150°C for 3 hours, so that the straw fiber can completely dehumidify and remove low-molecular-weight volatile substances in the wood powder.

(2) The municipal solid waste is bag-broken and sorted by two-stage drum sieve, and further air-separated by a double-chamber multifunctional air separator to obtain mixed plastics of polyethylene, polypropylene, and polyvinyl chloride, according to the proportion The polyethylene, polypropylene and polyvinyl chloride are washed and crushed, dried and dehydrated, and granulated to obtain mixed plastic granules with a granulation size of 40-80 mesh.

(3) In a heating jacket high-speed mixer at a temperature of 150°C, first add straw fiber filler and stir for 5 minutes, then add mixed plastic particles and other additives except compatibilizer, stir to make it evenly mixed . The compatibilizer is added 5 minutes before discharging. The addition of coupling agent and compatibilizer is beneficial to improve the interface affinity between wheat straw fiber and plastic resin, increase the compatibility between wheat straw fiber and plastic resin, and play a role in modifying the surface of wheat straw fiber. The mixing time of the whole process is 20-30 minutes. Since the plastic is in a semi-molten state after being heated in the mixer, it is evenly mixed with other raw materials under the stirring of the rotor and adhered to it. In the end, pellets with wheat straw fibers evenly wrapped on the plastic surface are formed, and the pellets are pelletized to obtain plastic wood pellets.

(4) Use a screw extruder to extrude the pellets to obtain a plastic wood sample. During extrusion molding, the temperature of the feeding section is set to 140°C, and the temperature of the extrusion section is set to 210°C.

Referring to Fig. 1 to Fig. 5, the two-stage drum screen used for municipal solid waste used in the present invention includes a fixed frame 8, a drum screen mounted on the fixed frame 8, and a drum screen driving device 4; the drum screen It includes a trommel inlet section 1 and a trommel outlet section 5 connected to each other; the feeding port 2 is installed at the entrance of the trommel inlet section 1, and an undersize collection device 7 is provided below the trommel; the trommel inlet section 1 and Several sieve holes 101 are arranged in the circumferential direction of the trommel outlet section 5, and a number of bag-breaking knives 102 are installed on the circumferential inner wall of the trommel inlet section 1. Knife device 103; the outer periphery of the trommel inlet section 1 and the trommel outlet section 5 is provided with a hole cleaning device 6 for cleaning the screen hole 101; the inner wall of the trommel outlet section 5 is equipped with a number of strip hanging devices 501, A long object collecting device composed of three rows of hanging needle chains 502, 503, 504 is installed in the outlet section 5. The angle β between the drum screen and the horizontal direction is 3°~8°. The bag-breaking knife 102 is welded on the steel plate 105, and is installed on the inner wall circumference of the trommel inlet section 1 in an embedded manner. When disassembling, the steel plate 105 welded with the bag-breaking knife 102 is jacked up by a screw through the threaded hole 104, and the bag-breaking knife 102 is welded from one end. The steel plate 105 is pulled out for disassembly.

Household waste is transported by the material conveyor to the front section of the two-stage drum screen that reaches a certain speed. Domestic garbage entering the trommel screen rotates with the trommel screen. When the domestic waste rotates to a certain height, the domestic waste is thrown out with a parabolic trajectory and falls back to the bottom of the screen. This process is repeated, so that the domestic waste reaches a state of continuous tumbling in the drum. In the process of continuous tumbling, the material whose particle size is smaller than the sieve hole diameter will pass through the sieve hole and fall into the under-sieve collection device, and the material whose particle size is larger than the sieve hole diameter will be discharged from the outlet at the lower end of the sieve cylinder along the wall of the cylinder, so as to realize the sieving process. points function. When domestic waste is thrown up and falls to the bottom of the drum screen, the bag breaking knife installed in the front section of the screen drum will penetrate into the plastic bags, clothes and other materials, and then through the extrusion and tearing of other materials, the plastic bags, clothes, etc. The material is scratched, so as to realize the function of breaking bags and clothes. The broken plastic bags, clothes, etc. enter the rear section of the two-stage drum screen with the rotation of the drum screen. A long object hanging device is installed in the circumferential direction of the cylinder wall of the rear section of the drum screen, and a long object collecting device is installed on the central attachment. The broken plastic bags and clothes will be picked up by the long object hanging device during the process of rotating with the drum sieve. After reaching a certain height, they will slide down, fall to the long object collecting device, and be transported out of the drum, thus realizing The function of collecting broken bags and long strips is improved. In order to prevent the sieve holes from being clogged by household garbage with high water content, a sieve hole cleaning device is installed on the outer wall of the sieve drum. The hole cleaning device cooperates with the sieve hole. When the sieve hole is transferred to the hole cleaning device, the hole cleaning device will clean the sieve hole, so as to realize the hole cleaning function.

The working process of the two-stage trommel screen of the present invention is as follows: firstly, municipal solid waste enters the inlet section 1 of the two-stage multi-functional trommel screen which reaches a certain speed through the feed port 2 . The municipal solid waste entering the entrance section 1 of the trommel screen rotates together with the trommel screen. When the domestic waste reaches a certain height, the domestic waste is thrown out with a parabolic trajectory and falls back to the bottom of the screen. Repeat this process to make the domestic waste It is in a state of continuous tumbling in the drum. In the process of continuous tumbling, domestic garbage with a particle size smaller than the diameter of the sieve hole passes through the sieve hole 101, falls into the undersize collection device 7, and is collected and transported; The outlet section 5 is discharged, so as to realize the screening function of materials with different particle sizes. When domestic garbage is thrown up and falls to the bottom of the drum screen, the bag breaking knife 102 installed on the inner wall circumference of the drum screen inlet section 1 will penetrate into plastic bags, fabrics and other materials, and then squeeze and tear other materials, Cut plastic bags, clothing and other materials, so as to realize the function of breaking bags and fabrics. The shape of the bag breaking knife 102 is a quadrangular pyramid, and one side thereof is perpendicular to the bottom surface of the bag breaking knife. The broken plastic bags, fabrics, etc. enter the trommel outlet section 5 along with the rotation of the trommel. A long object hanging device 501 is installed in the circumferential direction of the inner wall of the trommel outlet section 5 , and a long article collection device composed of hanging pin chains 502 , 503 , and 504 is also installed inside the trommel outlet section 5 . The hanging pin chain includes a moving part and a fixed part; a number of hanging pins are installed on the moving part, and the fixed part guides the moving part. The broken plastic bags and fabrics will be picked up by the long object hanging device 501 in the process of rotating with the drum screen, and will slide down to the long object collecting device after reaching a certain height. Hanging pins of limited width so that only softer slivers are hung on the slivers collector. The plastic hanging on the long strip collecting device is conveyed out of the drum, thereby realizing the collection and conveyance function of long strips. In order to prevent the bag breaking knife 102 from being entangled by plastic substances during the bag breaking process, a knife cleaning device 103 for cleaning the bag breaking knife is installed on the inner wall of the drum screen. The knife cleaning device 103 is a disc equipped with a scraper. On the knife cleaning device 103, two scrapers cooperate with a bag-breaking knife 102, and the two scrapers are respectively located on both sides of a bag-breaking knife 102, and the rotation direction of the scraping knife and the bag-breaking knife 102 is opposite. When the bag breaking knife 102 rotates to the scraper position of the knife cleaning device 103, the scrapers on both sides of the bag breaking knife will clean up the plastic waste wrapped around the bag breaking knife, thereby realizing the knife cleaning function. In order to prevent the sieve holes 101 from being clogged by household garbage with a high water content, a sieve hole cleaning device 6 is installed on the outer wall of the sieve cylinder. The hole cleaning device 6 cooperates with the sieve holes. The device 6 cleans the sieve holes, so as to realize the hole cleaning function; the hole cleaning device 6 can choose a cleaning device such as a hair brush.

Please refer to shown in Fig. 6 to Fig. 9, air separation equipment used in the present invention (multi-functional air separation machine for double air chambers for municipal solid waste), municipal solid waste enters the rotary feed air locker 1211, and the rotary feed lock The rotating blade of air separator 1211 is airtightly matched with the housing of winnowing machine, prevents the gas in the winnowing machine from running out from rotating feed air locker 1211; Fall down evenly under rotation and break up by breaking up the drum 1210; enter the first winnowing room 1212, the blower unit 121 is connected to the first wind chamber air inlet 129 on the top of the first winnowing room 1212 through the pipeline, and the garbage is in the first winnowing room 1212 is blown by the wind blown by the blower unit 121 for the first sorting, sorting out plastic paper and heavy objects; heavy objects are mainly metal and large inorganic objects, which are relatively heavy and will not be separated. The wind blows far away, and directly falls into the first two-stage air-lock discharge device 125 (heavy material discharge device) located below the garbage inlet of the first winnowing chamber 1212, and then is output through the conveyor belt 124; The wind blows and falls to the vibrating screen 126 on the right side of the first two-stage air-locking discharge device 125, and is screened out by the vibrating screen 126 and falls into the second two-stage air-locking discharge device 123 (small inorganic material discharge device). , and then output through the conveyor belt 122; the rest of the material enters the second winnowing chamber 1218, and the kitchen waste is separated through impurity removal. The cyclone dust collector 1213 is connected to the air outlets of the first winnowing room 1212 and the second winnowing room 1218, and the wind after the dust is removed by the cyclone dust collector 1213 is sent to the blower unit 121 to realize recycling. Heavy material conveying conveyor belt 124, small piece inorganic substance conveyor belt 122, kitchen waste conveyor belt 1223, plastic paper conveyor belt 1220, plastic paper conveyor belt 1217 are placed in the lower part of the winnowing machine successively. The air inlet 129 of the first air chamber and the air inlet 1221 of the second air chamber have a right-angled trapezoidal section along the air inlet direction, and a rectangle perpendicular to the air inlet direction; A is equal in length; the angle between the non-right-angled side and the horizontal side is 10 °-20 °, preferably 15 °; experiments and numerical simulations show that when the air inlets of the first and second winnowing chambers are right-angled trapezoidal sections, the flow at the outlet The field is stable and free of eddies. The air outlet speed of the air inlet 129 of the first air chamber can be adjusted through the air release valve 127 and the flow meter 128 .

With this structure, its working principle and implementation mode: the garbage that has been preliminarily separated and crushed enters the first winnowing chamber 1212 through the rotary feeding air locker 1211 . By controlling the rotation speed of the rotary feeding air locker 1211, the amount of feed can be effectively controlled. At the same time, the use of this feeder can effectively avoid air leakage, maintain a slight positive pressure in the air separator, and keep the flow field in the air separator stable. The fed garbage is broken up by the breaking drum 1210 to avoid agglomeration and effectively improve the winnowing accuracy. After being dispersed by the breaking drum 1210, the garbage enters the flow field of the winnowing room. Under the action of wind force, all kinds of materials produce different lateral displacements, and the heavier bulk inorganic waste basically does not deflect and falls to the first two-stage air-locking discharge device 125. After the heavy objects are output, they can be Enter the magnetic separation workshop to select metal substances by magnetic separation. Simultaneously, in the first winnowing room 1212, the density is relatively small, mostly sheet-like plastics and papers are blown to the tail of the winnowing room, and a part falls to the fifth double-stage air-lock discharge device 1216 and then falls to the conveyor belt 17 On the output, a part is scraped off by the scraper 14 and dropped to the fifth dual-stage air-lock discharge device 1216 (plastic and paper discharge device), and then falls to the conveyor belt 17 for output. Most of the intermediate substances fall on the right side of the first double-stage air-lock discharge device 125 and are located on the vibrating screen 126 in the middle part of the first winnowing chamber 1212. Objects (such as glass blocks, ceramic blocks) fall to the front end of the vibrating screen, and the vibrating screen sieves out small pieces of inorganic matter and drops them into the second two-stage air-lock discharge device 123 (small block inorganic matter discharge device), and then passes through Conveyor belt 122 output. In the actual operation process, the purity of the kitchen waste sieved out of inorganic matter is not high, and some agglomerated plastics and relatively dense hard plastics are mixed in it. The second winnowing chamber 1218, the second wind chamber air inlet 1221 is located below the discharge port of the vibrating screen 126, and its wind speed is lower than the first winnowing chamber 1212, and the food waste falls to the third double-stage air-locking outlet near the tuyere. The material device 1222 (food waste) falls to the conveyor belt 1223 for output, and the impurities including plastic and paper fall into the fourth double-stage air-lock discharge device 1219 (plastic and paper discharge device) far away from the tuyere, and then fall to the The conveyor belt 1220 is output to the discharge device, and mixed with the plastic paper selected by the first air selection chamber 1212, and then enters the next workshop for separation. The first winnowing room 1212 and the second winnowing room 1218 are connected to the cyclone dust collector 1213 through the air outlet of the pipeline 1215, and the dust with a small density and particle size is separated, and the dust is sent to the corresponding brick-making workshop or processed by a conveyor. landfill. The waste gas flows through the dust collector to the blower unit 121 to form a circulating air, and the whole system is in a fully closed state, without secondary pollution and without waste gas treatment facilities.

Example 2:

The preparation method of embodiment 2 is identical with embodiment 1, just formula is different.

Table 2 Example 2 WPC formula

Example 3:

The preparation method of embodiment 3 is identical with embodiment 1, just formula is different.

Table 3 Example 3 WPC formula

Formula Composition Mass percentage (%) Polyethylene 32.8 Polypropylene 6 Polyvinyl chloride 14 straw fiber 31 Compatibilizer (isocyanate) 8.2 Coupling agent (maleic anhydride grafted polypropylene (MAPP)) 2.2 Light stabilizer (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate) 0.4 Antioxidant (2,6-di-tert-butylbenzene) 0.6 Lubricant (9,10-dihydroxystearic acid) 2.2 Colorant (ASA bright/matte color co-extrusion material) 1.4 Antistatic agent (ATMER 129) 0.8 Deodorizing bactericidal preservative (IRGAGUARD B1000) 0.4

Example 4:

The preparation method of embodiment 4 is identical with embodiment 1, just formula is different.

Table 4 Example 4 WPC formula

Example 5:

The preparation method of embodiment 5 is identical with embodiment 1, just formula is different.

Table 5 Example 5 WPC formula

Formula Composition Mass percentage (%) Polyethylene 32 Polypropylene 6 Polyvinyl chloride 9 straw fiber 43 Compatibilizer (isocyanate) 5 Coupling agent (maleic anhydride grafted polypropylene (MAPP)) 0.5 Light stabilizer (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate) 1 Antioxidant (2,6-di-tert-butylbenzene) 0.5 Lubricant (Butyl Stearate) 0.5 Colorant (ASA bright/matte color co-extrusion material) 1.5 Antistatic agent (ATMER 129) 0.6 Deodorizing bactericidal preservative (IRGAGUARD B1000) 0.4

The samples of Example 1 were tested for mechanical properties. The test results are shown in Table 6.

Table 6 Example 1 sample mechanical properties test results

Test items Example Notched Impact Strength (kJ/m ² ) 43 Tensile strength (MPa) twenty two Bending strength (MPa) 37 Elongation at break (%) 4 Water absorption (%) 0.6 Grip screw force (N) 3800 Shore Hardness (HRR) 87

Claims (8)

1. mould a wood, it is characterized in that, this is moulded wood and is comprised of following mass percent component: polyethylene 32%～43%, polypropylene 6%～8%, polyvinyl chloride 8%～14%, Wheat straw fiber 31%～43%, compatilizer 4.5%～8.2%, coupling agent 0.4%～2.2%, photostabilizer 0.4%～0.7%, antioxidant 0.4%～0.6%, lubricant 2.2%～4.5%, tinting material 1.4%～2.2%, static inhibitor 0.3%～0.8%, deodorizing sterilizing sanitas 0.2%～0.4%;

The particle diameter of described Wheat straw fiber is 20～80 orders;

What compatilizer adopted is isocyanic ester compatilizer, and what coupling agent adopted is maleic anhydride inoculated polypropylene coupling agent.

2. the wood of moulding according to claim 1, is characterized in that: this is moulded wood and is comprised of following mass percent component: polyethylene 36%, polypropylene 7%, polyvinyl chloride 10%, Wheat straw fiber 33%, compatilizer 5.6%, coupling agent 1.5%, photostabilizer 0.6%, antioxidant 0.5%, lubricant 3.1%, tinting material 1.8%, static inhibitor 0.6%, deodorizing sterilizing sanitas 0.3%.

3. the wood of moulding according to claim 1, it is characterized in that: polyethylene, polypropylene and polyvinyl chloride form mixed plastic jointly, this mixed plastic be domestic waste through the broken bag of two-segment cylinder sieve and hang sorting and further the multi-functional winnowing machine selection by winnowing of double-wind chamber obtain.

4. the wood of moulding according to claim 3, is characterized in that, described two-segment cylinder sieve comprises fixed frame, is arranged on trommel screen and trommel screen drive unit (4) on fixed frame; Trommel screen comprises interconnective trommel screen entrance (1) and trommel screen outlet section (5); Material inlet (2) is installed on the ingress of trommel screen entrance (1), and the below of trommel screen is provided with siftage collecting device (7); On the circumferential direction of trommel screen entrance (1) and trommel screen outlet section (5), be furnished with some sieve apertures (101), trommel screen entrance (1) circumferential inner wall is provided with some broken bag cuttves (102), is provided with the clear knife system (103) matching with described broken bag cutter (102) in trommel screen entrance (1); The periphery of trommel screen entrance (1) and trommel screen outlet section (5) is provided with the hole cleaning device (6) of cleaning sieve aperture (101); Trommel screen outlet section (5) circumferential inner wall is provided with some rectangular things and hangs device (501), and the rectangular thing collection device that three row's tuck chains (502,503,504) form is installed in trommel screen outlet section (5).

5. according to the wood of moulding described in claim 3 or 4, it is characterized in that, the multi-functional winnowing machine of described double-wind chamber comprises housing, is provided with the first selection by winnowing chamber, the second selection by winnowing chamber and vibratory screening apparatus in housing; The opening for feed place of housing is provided with rotary feeder; On housing, below rotary feeder, be provided with the first air compartment blast inlet that is communicated with blower unit; The first bottom, selection by winnowing chamber is provided with the first twin-stage lock gas drawing mechanism near the first air compartment blast inlet place; The right side of the first twin-stage lock gas drawing mechanism is provided with vibratory screening apparatus; The bottom of vibratory screening apparatus is provided with the second twin-stage lock gas drawing mechanism; The right side of vibratory screening apparatus is the second selection by winnowing chamber; The discharge port below of vibratory screening apparatus is provided with the second air compartment blast inlet that is communicated with blower unit, the second bottom, selection by winnowing chamber is provided with the 3rd twin-stage lock gas drawing mechanism near the second air compartment blast inlet place, and the second bottom, selection by winnowing chamber is provided with the 4th twin-stage lock gas drawing mechanism away from the second air compartment blast inlet place; The 4th twin-stage lock gas drawing mechanism top of the second rear portion, selection by winnowing chamber is provided with the second pecten; The first selection by winnowing chamber is provided with the first pecten and the 5th twin-stage lock gas drawing mechanism away from the rear portion of the first air compartment blast inlet; The first selection by winnowing chamber is connected cyclonic separator with the air outlet of the second selection by winnowing chamber by pipeline; Cyclonic separator connects blower unit by pipeline.

6. the wood of moulding according to claim 1 and 2, it is characterized in that: what antioxidant adopted is 2,6-di-tert-butyl, photostabilizer adopts two (2,2,6,6-tetramethyl--4-piperidyl) sebate, lubricant adopts stearic acid, 12-oxystearic acid, 9,10-dihydroxystearic acid, methyl stearate, butyl stearate or 2-hydroxystearic acid methyl esters, tinting material adopts ASA light/dumb light color coextrusion material, and static inhibitor adopts ATMER129, and deodorizing sterilizing sanitas adopts IRGAGUARD B1000.

7. prepare wooden method of moulding as described in any one in claim 1 to 6, it is characterized in that, comprise the following steps:

(1) by being crushed to 20～80 object Wheat straw fibers, at the drying baker inner drying of 150 ℃, process 3h;

(2) by domestic waste through the broken bag of two-segment cylinder sieve and hang sorting and further the multi-functional winnowing machine selection by winnowing of double-wind chamber obtain polyethylene, polypropylene and polyvinyl chloride, proportionally getting polyethylene, polypropylene and polyvinyl chloride cleans broken, drying and dehydrating also carries out granulation, and obtaining granularity is 40～80 object mixed plastic particles;

(3) in temperature is the heating jacket high-speed mixer of 150 ℃, first add Wheat straw fiber, stir 5 minutes, then mixed plastic particles and other auxiliary agents except compatilizer are added and stirred, compatilizer adds in discharging for first 5 minutes, and after stirring, discharging obtains and mould wood.

8. method according to claim 7, is characterized in that, the wood of moulding after step (3) discharging is carried out to granulation and obtains moulding wooden particle, then utilizes extruser will mould wooden particle extrusion moulding, obtains moulding wooden sample; During extrusion moulding, feeding section temperature is 140 ℃, and extruding zone temperature is 210 ℃.

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