CN111793292A - Ozone-resistant regenerated plastic and processing technology thereof - Google Patents
Ozone-resistant regenerated plastic and processing technology thereof Download PDFInfo
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Abstract
The application relates to an ozone-resistant regenerated plastic and a processing technology thereof, belonging to the technical field of regenerated materials, wherein the raw materials used by the regenerated plastic comprise the following components in parts by weight: recovered polystyrene 76.79-82.79 parts, polystyrene 6.97-12.97 parts, polystyrene butadiene copolymer 8.00-11.94 parts, carbon black 0.08-0.18 part, magnesium stearate 0.10-0.16 part, basalt fiber 5.72-7.72 parts, nano silicon dioxide 8-12 parts, nano alumina 11.8-13.8 parts, wood powder 14.68-16.68 parts, hyperdispersant 0.035-0.045 part, 1-ethyl-3-methylimidazole dimethyl phosphate 0.15-0.25 part, dihydroflavone glycoside 0.1-0.2 part and microcrystalline cellulose 0.08-0.10 part.
Description
Technical Field
The application relates to the technical field of recycled materials, in particular to an ozone-resistant recycled plastic and a processing technology thereof.
Background
At present, with the development of economy, the usage amount of plastics is higher and higher, but because plastics can not be naturally degraded, the environment can be greatly polluted, so in order to achieve environmental protection and energy saving, waste plastics are generally subjected to resource recovery, processing and recycling, and resources are not lost.
Plastic is used as an insulating material to manufacture a shell, a toner cartridge and other positions of a printer, and when the printer is in an operating state, a high-voltage discharge arc is generated, oxygen in air generates ozone under the stimulation of the high-voltage discharge arc, and the ozone has strong oxidizing property, so that the plastic is easily oxidized to generate phenomena such as fading, strength reduction and the like after long-time use.
Disclosure of Invention
The aim of the application is to provide an ozone-resistant recycled plastic which has oxidation resistance and reduces the possibility of discoloration or strength reduction caused by oxidation of the plastic.
The second purpose of the application is to provide a processing technology of the ozone-resistant recycled plastic, which is simple in technology and enables the produced recycled plastic to have strong ozone resistance.
The above object of the present application is achieved by the following technical solutions:
the ozone-resistant regenerated plastic comprises the following raw materials in parts by weight: 76.79-82.79 parts of recycled polystyrene, 6.97-12.97 parts of polystyrene, 8.00-11.94 parts of polystyrene butadiene copolymer, 0.08-0.18 part of carbon black, 0.10-0.16 part of magnesium stearate, 5.72-7.72 parts of basalt fiber, 8-12 parts of nano silicon dioxide, 11.8-13.8 parts of nano aluminum oxide, 14.68-16.68 parts of wood powder, 0.035-0.045 part of hyperdispersant, 0.15-0.25 part of 1-ethyl-3-methylimidazole dimethyl phosphate, 0.1-0.2 part of dihydroflavone glycoside and 0.08-0.10 part of microcrystalline cellulose.
By adopting the technical scheme, in order to save resources and reduce production cost, the recycled polystyrene in the range is added and mixed with polystyrene to be used to prepare the recycled plastic, and the mechanical property of the recycled polystyrene is poor, so that the mechanical property of the recycled polystyrene is enhanced by adding the wood flour in the range, and the wood flour are mutually crossed and wound to form a good wrapping phenomenon with the recycled polystyrene so as to generate good mechanical interlocking. The mesh number of the wood powder used in the application is 100-200 meshes, the specific surface area of the wood powder in the mesh number range is larger, the contact area of the wood powder and the recycled polystyrene is increased, the bonding force between the wood powder and the recycled polystyrene is increased, and the mechanical property of the recycled polystyrene is enhanced.
The carbon black is light, loose and superfine black powder with large specific surface area, and is added in the range, so that the carbon black is dispersed in the recycled plastic, the mechanical property of the recycled plastic can be enhanced, and the effects of coloring and toning are achieved. Since the higher the degree of dispersion of carbon black in recycled plastics, the higher the coloring strength, carbon black is used in combination with magnesium stearate and a hyperdispersant within this range, and the coloring property of carbon black in recycled plastics is improved.
The polystyrene butadiene copolymer has uniform quality, less foreign matters and excellent mechanical stability, and the polystyrene butadiene copolymer is added into the plastic in the range and matched with the recycled polystyrene for use, so that the toughness of the recycled plastic can be improved, the bearing strength is increased, and the brittleness of the recycled plastic is reduced.
Magnesium stearate and hyperdispersant are used as dispersing agents, and the dispersing property of carbon black in the recycled plastic and the dispersing property of other components in the recycled plastic can be improved when the magnesium stearate and hyperdispersant are added into the recycled plastic. The molecular structure of the hyperdispersant is composed of two parts with different performances and functions, one part is an anchoring group, the other part is a solvation polymerization chain, and the hyperdispersant can be better compatible with polymers such as recycled polystyrene, polystyrene and polystyrene butadiene copolymer, so that the hyperdispersant is added into the recycled plastic according to the range, all the components in the recycled plastic can be better dispersed in the recycled plastic, the compatibility and the stability between the components are improved, the agglomeration or flocculation phenomenon is not easy to occur, and the mechanical property of the recycled plastic is improved.
Since the oxidation rate of the recycled plastic is accelerated by the increase of the temperature, and the oxidation rate of the recycled plastic is accelerated if the heat resistance of the recycled plastic is poor, the heat resistance of the recycled plastic needs to be improved in order to make the recycled plastic have a strong oxidation resistance even in a high-temperature environment. The nano silicon dioxide has higher heat resistance value, better heat resistance and higher strength, the heat resistance and the mechanical property of the recycled plastic can be obviously improved by adding the nano silicon dioxide into the recycled plastic according to the range, if the addition amount of the nano silicon dioxide is too much, the integral hardness of the recycled plastic is too high, the brittleness is increased, the recycled plastic is easy to impact and break, and the anti-cracking property of the recycled plastic is reduced;
the basalt fiber is a fiber obtained by melting natural basalt ore at high temperature of about 1500 ℃, then forming the molten basalt ore through a platinum-rhodium alloy bushing plate and drawing the molten basalt fiber at high speed by a wire drawing machine, so that the basalt fiber has high tensile strength, high temperature resistance, heat insulation and other excellent performances, the use tolerance temperature range of the basalt fiber is-260 ℃ to 700 ℃, the tolerance temperature range of the glass fiber and the like is generally 60 ℃ to 450 ℃, and the mechanical property and the heat resistance of the plastic can be obviously improved by adding the basalt fiber into the regenerated plastic according to the range;
therefore, the nano silicon dioxide and the basalt fiber are added into the recycled plastic according to the range, so that the heat resistance and the mechanical property of the recycled plastic can be obviously improved; meanwhile, the nano silicon dioxide can improve the tensile strength of the basalt fiber and can enable Fe in the basalt fiber to be contained2+Conversion to Fe3+The heat resistance of the basalt fiber is improved, and the phenomenon that the strength of the basalt fiber is reduced at a higher temperature is reduced, so that the heat resistance of the recycled plastic is improved.
The nano alumina is added into the recycled plastic according to the range, so that the binding force among all components in the recycled plastic can be enhanced, the nano alumina is matched with nano silicon dioxide and basalt fiber and mutually matched, the mechanical property and the heat resistance of the recycled plastic are improved, and the oxidation resistance of the recycled plastic can be improved by adding the nano alumina into the recycled plastic.
The 1-ethyl-3-methylimidazole dimethyl phosphate belongs to an ionic liquid, has good thermal stability, and can improve the oxidation resistance and heat resistance of the regenerated plastic by adding the 1-ethyl-3-methylimidazole dimethyl phosphate into the regenerated plastic according to the range; the flavanone glycoside is also called as hesperidin, has high thermal stability, can be matched with 1-ethyl-3-methylimidazole dimethyl phosphate in the regenerated plastic to play a synergistic effect, and can improve the oxidation resistance and the heat resistance of the regenerated plastic together;
the microcrystalline cellulose is a powdery substance obtained by hydrolyzing natural fibers to the limit polymerization degree, has low polymerization degree, large specific surface area and good adsorbability, and is matched with 1-ethyl-3-methylimidazole dimethyl phosphate and flavanone glycoside in the regenerated plastic to reduce the possibility of breakage of double bonds of polymers in the regenerated plastic, thereby achieving the effect of improving the oxidation resistance of the regenerated plastic and improving the ozone resistance of the regenerated plastic.
Preferably, the raw materials comprise the following components in parts by weight: 79.00-80.58 parts of recycled polystyrene, 8.97-10.97 parts of polystyrene, 9.00-10.94 parts of polystyrene butadiene copolymer, 0.10-0.16 part of carbon black, 0.11-0.15 part of magnesium stearate, 6.00-7.44 parts of basalt fiber, 9.5-10.5 parts of nano silicon dioxide, 12.0-13.6 parts of nano aluminum oxide, 15.00-16.36 parts of wood powder, 0.038-0.042 parts of hyper-dispersant, 0.18-0.22 part of 1-ethyl-3-methylimidazole dimethyl phosphate, 0.13-0.17 part of flavanone glycoside and 0.085-0.095 part of microcrystalline cellulose.
By adopting the technical scheme, the recycled polystyrene and the polystyrene are matched to prepare the recycled plastic according to the range, so that the resource is saved, and the production cost is reduced; simultaneously adding carbon black in the range as a coloring agent into the recycled plastic; simultaneously, nano silicon dioxide, nano aluminum oxide, 1-ethyl-3-methylimidazole dimethyl phosphate, flavanone glycoside, basalt fiber, wood powder and microcrystalline cellulose are added according to the range to be mixed and matched for use, so that the oxidation resistance, the heat resistance and the mechanical property of the regenerated plastic are further improved; meanwhile, the magnesium stearate and the hyperdispersant in the range are added to be used as the dispersant in a matching way, so that the dispersibility of each component in the recycled plastic is enhanced, the effect of each component in the recycled plastic is improved, and the oxidation resistance, the heat resistance and the mechanical property of the recycled plastic are improved.
Preferably, the weight ratio of the nano silicon dioxide to the nano aluminum oxide is 1: (1.25-1.35).
By adopting the technical scheme, the nano silicon dioxide and the nano aluminum oxide are mixed and matched according to the proportion range, so that the nano silicon dioxide and the nano aluminum oxide can play a synergistic effect with each other, the nano silicon dioxide can effectively inhibit the nano aluminum oxide from high-temperature phase change at high temperature, the nano aluminum oxide can make up the oxidation resistance of the nano silicon dioxide, and the oxidation resistance, the heat resistance and the mechanical property of the regenerated plastic are improved together.
If the proportion range of the nano silicon dioxide and the nano aluminum oxide is lower than the range, the synergistic effect between the nano silicon dioxide and the nano aluminum oxide cannot be exerted, so that the oxidation resistance, the heat resistance and the mechanical property of the regenerated plastic are reduced; if the ratio range of the nano silicon dioxide and the nano aluminum oxide is higher than the range, the nano silicon dioxide cannot fully play a role in inhibiting the high-temperature phase change of the nano aluminum oxide, so that the oxidation resistance and the thermal stability of the nano aluminum oxide are reduced, and the oxidation resistance and the heat resistance of the regenerated plastic are further reduced.
Preferably, the nano silicon dioxide is prepared by the following method:
uniformly mixing ethanol, water, tetraethyl orthosilicate and ammonia water, stirring and reacting for 7.5-8.5h at the temperature of 26-28 ℃ and the rotating speed of 290-310r/min, centrifuging, washing, drying at the temperature of 62-64 ℃, and grinding to obtain the nano silicon dioxide, wherein the weight ratio of the ethanol to the water to the tetraethyl orthosilicate to the ammonia water is (46-50): (0.6-1.0): (0.7-1.0): (3.6-3.9).
By adopting the technical scheme, the particle size of the prepared nano silicon dioxide can be influenced by the factors of the addition amount of the ammonia water, the reaction temperature and the reaction time, and the particle size of the nano silicon dioxide is controlled within a proper range, so that the dispersity of the nano silicon dioxide in the regenerated plastic can be obviously improved, and the effect of the nano silicon dioxide in the regenerated plastic is enhanced. Therefore, the conditions such as the addition amount of ammonia water, the reaction temperature, the reaction time and the like are controlled within the range, the particle size of the prepared nano silicon dioxide can be controlled to be about 40-45nm, the dispersibility of the nano silicon dioxide in the recycled plastic is obviously improved, and the mechanical property of the recycled plastic is improved.
If the addition amount of the ammonia water is less than the range, the particle size of the nano silicon dioxide is too small, and if the addition amount of the ammonia water is more than the range, the particle size of the nano silicon dioxide can not be increased continuously, and the cost is increased; if the reaction temperature is lower than the range, the particle size of the nano silicon dioxide is too large, and if the reaction temperature is higher than the range, the particle size of the nano silicon dioxide is too reduced, and the interaction between the nano silicon dioxide with small particle size is too strong and easy to agglomerate; if the reaction time is less than this range, the particle size of the nano-silica is too small, and if the reaction time is more than this range, the particle size of the nano-silica cannot be increased further and the cost is increased.
Preferably, the nano-silica is modified by the following method:
drying the nano-silica at the temperature of 120-125 ℃, mixing with ethanol, performing ultrasonic dispersion for 30-35min to obtain nano-silica suspension with the mass concentration of 4.8-5.0%, mixing with dichlorodimethylsilane, refluxing for 50-60min at the temperature of 130-132 ℃, washing, and drying at the temperature of 120-122 ℃ to obtain the modified nano-silica, wherein the weight ratio of the nano-silica suspension to the dichlorodimethylsilane is 1: (0.075-0.080).
By adopting the technical scheme, dichlorodimethylsilane is used as a modifier to modify the nano-silica, so that the modified nano-silica has stronger hydrophobicity, the dispersibility of the nano-silica in the regenerated plastic is improved, the dosage of the dichlorodimethylsilane is controlled within the range, the contact angle of the modified nano-silica can be maximized, the hydrophobicity is highest, the dispersing capacity of the modified nano-silica is best, the contact angle cannot be maximized when the dosage of the dichlorodimethylsilane is lower than or higher than the range, and the dispersibility of the modified nano-silica is reduced.
Preferably, the nano alumina is modified by the following method:
firstly, drying nano alumina for 1.5-2.0h at the temperature of 118-122 ℃, then mixing the dried nano alumina with ethanol, ultrasonically dispersing for 25-30min, then dropwise adding a silane coupling agent at the temperature of 80-90 ℃, reacting for 50-55min, cooling to 20-23 ℃, washing for 2-3 times, pouring out supernatant, and drying for 11-12h at the temperature of 80-82 ℃ to obtain modified nano alumina; wherein the weight ratio of the nano alumina to the ethanol is 1: (13-15); the weight ratio of the nano alumina to the silane coupling agent is 1: (0.02-0.03).
By adopting the technical scheme, the nanometer alumina serving as inorganic particles in the regenerated plastic has poor compatibility with polymers in the regenerated plastic, and the aggregation phenomenon is easy to occur in the regenerated plastic, so the nanometer alumina needs to be organized. According to the range, the silane coupling agent is used as the modifying agent to modify the nano alumina, the temperature range and other conditions are controlled, and after the reaction is finished, unreacted substances on the surface of the nano alumina are washed away, so that the silane coupling agent is grafted to the surface of the nano alumina, the compatibility of the nano alumina and an organic phase in the regenerated plastic is enhanced, the dispersibility of the nano alumina in the regenerated plastic is improved, and the effects of improving the oxidation resistance and the heat resistance of the nano alumina in the regenerated plastic can be fully exerted. Meanwhile, the nano alumina is dried within the temperature range, so that the influence of moisture contained in the nano alumina on the modification process is reduced.
Preferably, the hyperdispersant comprises acrylic acid and allyl alcohol, and the weight ratio of the acrylic acid to the allyl alcohol is (8-12): (10-14).
By adopting the technical scheme, the acrylic acid belongs to the representative of anionic dispersing agents and has good dispersibility, but the structure of the acrylic acid has hydrophilic groups, so that the particles are easy to desorb and are caused to be flocculated again, and the lipophilic groups can not play a role in space stabilization. In addition, the excessive high or low proportion of the allyl alcohol in the hyperdispersant can reduce the dispersibility of the hyperdispersant, so that the oxidation resistance, the heat resistance and the mechanical property of the recycled plastic are influenced.
The second purpose of the application is to provide a processing technology of ozone-resistant recycled plastic, which comprises the following steps:
s1: drying all the raw materials at the temperature of 155-165 ℃ for 1.5-2.5 h;
s2: mixing the dried raw materials at a rotation speed of 45-55r/min for 10-15min to obtain a mixture;
s3: and melting, blending and extruding the mixture to obtain the recycled plastic.
By adopting the technical scheme, all the raw materials are dried within the temperature range, the moisture in all the raw materials is fully eliminated, the possibility of decomposition of the raw materials in the melting process is reduced, all the raw materials are uniformly mixed, and then are melted, blended and extruded, the process is simple, and the obtained regenerated plastic has higher oxidation resistance, heat resistance and mechanical property.
Preferably, the device used in the process of step S3 is a screw extruder; the temperature of each section of the screw extruder is as follows: the temperature of the head is 215-; the rotating speed of the screw in the screw extruder is 1590-1610 r/min.
Through adopting above-mentioned technical scheme, the temperature in the control screw extruder in this within range can obviously increase the mobility of reclaimed plastic fuse-element, improves reclaimed plastic's elongation at break to improved reclaimed plastic's mechanical properties, if the high temperature in the screw extruder, can make the energy consumption of preparation reclaimed plastic increase, thereby make manufacturing cost improve.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the recycled plastic prepared by the processing technology has higher oxidation resistance, heat resistance and mechanical property by virtue of the synergistic effect among the components in the raw materials;
2. the processing technology of the recycled plastic has the advantages that the operation process is simple, the ratio of the recycled polystyrene to the polystyrene in the used raw materials is high, and the production cost is low;
3. the compatibility among all components in the regenerated plastic is enhanced by adopting the modified nano silicon dioxide and the modified nano aluminum oxide.
Detailed Description
The present application will be described in further detail with reference to examples.
In the following examples and comparative examples:
recovered polystyrene was purchased from Fpico;
polystyrene was purchased from taiwan gaofu;
polystyrene butadiene copolymers are available from LG;
carbon black is available from ORION;
magnesium stearate was purchased from the chinese science;
1-Ethyl-3-methylimidazole dimethyl phosphate salt was purchased from Shanghai Chengjie Ionic liquids, Inc.;
flavanone glycosides were purchased from Hechengjing chemical Co., Ltd, Hubei;
microcrystalline cellulose was purchased from Jiangsu Caosheng Biotech limited;
the wood flour is purchased from the wood processing factory in Benzhou province in Fisher county, and the mesh number is 100-200 meshes.
Preparation example 1
The nano silicon dioxide is prepared by the following method:
uniformly mixing 46g of ethanol, 0.6g of water, 0.7g of tetraethyl orthosilicate and 3.6g of ammonia water, stirring and reacting for 7.5h at the temperature of 26 ℃ and the rotating speed of 290r/min, centrifuging, washing, removing unreacted substances, drying at the temperature of 62 ℃, and grinding to obtain the nano silicon dioxide with the particle size of 40 nm.
Preparation example 2
The nano silicon dioxide is prepared by the following method:
the preparation method comprises the steps of uniformly mixing 48g of ethanol, 0.8g of water, 0.85g of tetraethyl orthosilicate and 3.75g of ammonia water, stirring and reacting for 8 hours at the temperature of 27 ℃ and the rotating speed of 300r/min, centrifuging, washing, removing unreacted substances, drying at the temperature of 63 ℃, and grinding to obtain the nano silicon dioxide with the particle size of 42.5 nm.
Preparation example 3
The nano silicon dioxide is prepared by the following method:
50g of ethanol, 1g of water, 1g of tetraethyl orthosilicate and 3.9g of ammonia water are uniformly mixed, stirred and reacted for 8 hours at the temperature of 27 ℃ and the rotating speed of 300r/min, centrifuged, washed, unreacted substances are removed, and the nano silicon dioxide with the particle size of 45nm is obtained by drying and grinding at the temperature of 64 ℃.
Example 1
A processing technology of ozone-resistant recycled plastic comprises the following steps:
s1: 76.79kg of recycled polystyrene, 12.97kg of polystyrene, 8kg of polystyrene butadiene copolymer, 0.18kg of carbon black, 0.1kg of magnesium stearate, 7.72kg of basalt fiber, 8kg of nano-silica prepared in preparation example 1, 13.8kg of nano-alumina, 14.68kg of wood flour, 0.045kg of hyperdispersant, 0.15kg of 1-ethyl-3-methylimidazol dimethyl phosphate, 0.2kg of dihydroflavonol glycoside and 0.08kg of microcrystalline cellulose are dried at the temperature of 155 ℃ for 1.5 h;
s2: mixing the dried raw materials for 10min at a rotating speed of 45r/min to obtain a mixture;
s3: putting the mixture into a screw extruder, and carrying out melt blending and extrusion to obtain regenerated plastic; wherein the temperature of each interval of the screw extruder is as follows: the head temperature is 215 ℃, 195 ℃ in the 1 region, 195 ℃ in the 2 region, 200 ℃ in the 3 region, 200 ℃ in the 4 region, 205 ℃ in the 5 region, 205 ℃ in the 6 region, 210 ℃ in the 7 region and 210 ℃ in the 8 region; the rotating speed of the screw is 1590 r/min;
wherein in step S1, the hyperdispersant includes 0.02kg of acrylic acid and 0.025kg of allyl alcohol.
Example 2
A processing technology of ozone-resistant recycled plastic comprises the following steps:
s1: 82.79kg of recycled polystyrene, 6.97kg of polystyrene, 11.94kg of polystyrene-butadiene copolymer, 0.08kg of carbon black, 0.16kg of magnesium stearate, 5.72kg of basalt fiber, 12kg of nano-silica prepared in preparation example 1, 11.8kg of nano-alumina, 16.68kg of wood powder, 0.035kg of hyper-dispersant, 0.25kg of 1-ethyl-3-methylimidazol dimethyl phosphate, 0.1kg of dihydroflavonol glycoside and 0.1kg of microcrystalline cellulose are dried at a temperature of 155 ℃ for 1.5 hours;
s2: mixing the dried raw materials for 10min at a rotating speed of 45r/min to obtain a mixture;
s3: putting the mixture into a screw extruder, and carrying out melt blending and extrusion to obtain regenerated plastic; wherein the temperature of each interval of the screw extruder is as follows: the head temperature is 215 ℃, 195 ℃ in the 1 region, 195 ℃ in the 2 region, 200 ℃ in the 3 region, 200 ℃ in the 4 region, 205 ℃ in the 5 region, 205 ℃ in the 6 region, 210 ℃ in the 7 region and 210 ℃ in the 8 region; the rotating speed of the screw is 1590 r/min;
wherein in step S1, the hyperdispersant comprises 0.0152kg of acrylic acid and 0.019kg of allyl alcohol.
Example 3
A processing technology of ozone-resistant recycled plastic comprises the following steps:
s1: 79.79kg of recycled polystyrene, 9.97kg of polystyrene-butadiene copolymer, 0.13kg of carbon black, 0.13kg of magnesium stearate, 6.72kg of basalt fiber, 10kg of nano-silica prepared in preparation example 2, 12.8kg of nano-alumina, 15.68kg of wood powder, 0.04kg of hyperdispersant, 0.2kg of 1-ethyl-3-methylimidazol dimethyl phosphate, 0.15kg of dihydroflavonol glycoside and 0.09kg of microcrystalline cellulose are dried at the temperature of 160 ℃ for 2 hours;
s2: mixing the dried raw materials at a rotation speed of 50r/min for 12.5min to obtain a mixture;
s3: putting the mixture into a screw extruder, and carrying out melt blending and extrusion to obtain regenerated plastic; wherein the temperature of each interval of the screw extruder is as follows: the head temperature is 225 deg.C, 205 deg.C in 1 region, 205 deg.C in 2 region, 210 deg.C in 3 region, 210 deg.C in 4 region, 215 deg.C in 5 region, 215 deg.C in 6 region, 220 deg.C in 7 region, and 220 deg.C in 8 region; the rotating speed of the screw is 1600 r/min;
wherein in step S1, the hyperdispersant comprises 0.018kg of acrylic acid and 0.0216kg of allyl alcohol.
Example 4
A processing technology of ozone-resistant recycled plastic comprises the following steps:
s1: 79kg of recycled polystyrene, 10.97kg of polystyrene, 9kg of polystyrene butadiene copolymer, 0.16kg of carbon black, 0.11kg of magnesium stearate, 7.44kg of basalt fiber, 9.5kg of nano-silica prepared in preparation example 3, 13.6kg of nano-alumina, 15kg of wood powder, 0.042kg of hyperdispersant, 0.18kg of 1-ethyl-3-methylimidazole dimethyl phosphate, 0.17kg of dihydroflavonol glycoside and 0.085kg of microcrystalline cellulose are dried at the temperature of 165 ℃ for 2.5 hours;
s2: mixing the dried raw materials for 15min at a rotating speed of 55r/min to obtain a mixture;
s3: putting the mixture into a screw extruder, and carrying out melt blending and extrusion to obtain regenerated plastic; wherein the temperature of each interval of the screw extruder is as follows: the temperature of the machine head is 235 ℃, 215 ℃ in the 1 region, 215 ℃ in the 2 region, 210 ℃ in the 3 region, 220 ℃ in the 4 region, 220 ℃ in the 5 region, 225 ℃ in the 6 region, 225 ℃ in the 7 region and 230 ℃ in the 8 region; the rotating speed of the screw is 1610 r/min;
wherein in step S1, the hyperdispersant comprises 0.0192kg of acrylic acid and 0.0224kg of allyl alcohol.
Example 5
A processing technology of ozone-resistant recycled plastic comprises the following steps:
s1: 80.58kg of recycled polystyrene, 8.97kg of polystyrene, 10.94kg of polystyrene butadiene copolymer, 0.1kg of carbon black, 0.15kg of magnesium stearate, 6kg of basalt fiber, 10.5kg of nano-silica prepared in preparation example 3, 12kg of nano-alumina, 16.36kg of wood flour, 0.038kg of hyperdispersant, 0.22kg of 1-ethyl-3-methylimidazole dimethyl phosphate, 0.13kg of dihydroflavonol glycoside and 0.095kg of microcrystalline cellulose are dried at the temperature of 165 ℃ for 2.5 hours;
s2: mixing the dried raw materials for 15min at a rotating speed of 55r/min to obtain a mixture;
s3: putting the mixture into a screw extruder, and carrying out melt blending and extrusion to obtain regenerated plastic; wherein the temperature of each interval of the screw extruder is as follows: the temperature of the machine head is 235 ℃, 215 ℃ in the 1 region, 215 ℃ in the 2 region, 210 ℃ in the 3 region, 220 ℃ in the 4 region, 220 ℃ in the 5 region, 225 ℃ in the 6 region, 225 ℃ in the 7 region and 230 ℃ in the 8 region; the rotating speed of the screw is 1610 r/min;
wherein in step S1, the hyperdispersant comprises 0.018kg of acrylic acid and 0.021kg of allyl alcohol.
Example 6
The processing technology of the ozone-resistant recycled plastic is different from that of the embodiment 3 in that: the weight ratio of the nano silicon dioxide to the nano aluminum oxide is 1: 1.25, wherein the nano silicon dioxide is 10kg, and the nano aluminum oxide is 12.5 kg.
Example 7
The processing technology of the ozone-resistant recycled plastic is different from that of the embodiment 3 in that: the weight ratio of the nano silicon dioxide to the nano aluminum oxide is 1: 1.35, wherein the nano silicon dioxide is 10kg, and the nano aluminum oxide is 13.5 kg.
Example 8
The processing technology of the ozone-resistant recycled plastic is different from that of the embodiment 3 in that: the nano silicon dioxide is modified by the following method:
drying 4.8g of nano silicon dioxide at the temperature of 120 ℃, then mixing with 95.2g of ethanol, carrying out ultrasonic dispersion for 30min to obtain nano silicon dioxide suspension, then mixing with 0.36g of dichlorodimethylsilane, refluxing for 50min at the temperature of 130 ℃, washing, and drying at the temperature of 120 ℃ to obtain the modified nano silicon dioxide.
Example 9
The processing technology of the ozone-resistant recycled plastic is different from that of the embodiment 3 in that: the nano silicon dioxide is modified by the following method:
drying 5g of nano silicon dioxide at the temperature of 125 ℃, then mixing with 95g of ethanol, carrying out ultrasonic dispersion for 35min to obtain nano silicon dioxide suspension, then mixing with 0.4g of dichlorodimethylsilane, refluxing for 60min at the temperature of 132 ℃, washing, and drying at the temperature of 122 ℃ to obtain the modified nano silicon dioxide.
Example 10
The processing technology of the ozone-resistant recycled plastic is different from that of the embodiment 3 in that: the nano alumina is modified by the following method:
firstly, drying 10g of nano alumina at 118 ℃ for 1.5h, then mixing the dried nano alumina with 130g of ethanol, ultrasonically dispersing for 25min, then dropwise adding 0.2g of silane coupling agent at 80 ℃, reacting for 50min, cooling to 20 ℃, washing for 2 times, pouring out supernatant, and drying at 80 ℃ for 11h to obtain the modified nano alumina.
Example 11
The processing technology of the ozone-resistant recycled plastic is different from that of the embodiment 3 in that: the nano alumina is modified by the following method:
firstly drying 10g of nano alumina at the temperature of 122 ℃ for 2h, then mixing the dried nano alumina with 150g of ethanol, ultrasonically dispersing for 30min, then dropwise adding 0.3g of silane coupling agent at the temperature of 90 ℃, reacting for 55min, cooling to 23 ℃, washing for 3 times, pouring out supernatant, and drying at the temperature of 82 ℃ for 12h to obtain the modified nano alumina.
Comparative example 1
The difference from example 3 is that: no nano silicon dioxide, nano alumina, hyperdispersant, 1-ethyl-3-methylimidazole dimethyl phosphate, basalt fiber, flavanone glycoside, microcrystalline cellulose and wood powder are added, and the rest is the same.
Comparative example 2
The difference from example 3 is that: the nano alumina is not added, and the rest is the same.
Comparative example 3
The difference from example 3 is that: the same applies to the case where 1-ethyl-3-methylimidazole dimethyl phosphate is not added.
Comparative example 4
The difference from example 3 is that: the same applies except that no flavanonoside is added.
Comparative example 5
The difference from example 3 is that: no microcrystalline cellulose was added, and the rest was the same.
Comparative example 6
The difference from example 3 is that: the basalt fiber is replaced by glass fiber, and the rest is the same.
Performance testing
The recycled plastics obtained in examples 1 to 11 and comparative examples 1 to 6 were subjected to the following tests for ozone resistance, heat resistance and mechanical properties, and the test results are shown in Table 1:
testing ozone resistance: and (3) placing the prepared regenerated plastic into a crucible, performing air discharge operation for 50min at the flow rate of 150ml/min in the nitrogen atmosphere, changing the flow rate of nitrogen into 50ml/min, raising the temperature to 200 ℃ at the heating rate of 20 ℃/min, keeping the temperature of the regenerated plastic constant for 10min in the nitrogen environment after the temperature is reached, immediately switching the flow of nitrogen into the flow of oxygen of 50ml/min, continuing to keep the temperature constant until the regenerated plastic is completely oxidized, and recording the oxidation induction time (min).
Tensile property detection is carried out according to GB/T1040.1-2006, the recycled plastic is placed on a universal testing machine for tensile test, the tensile speed is 50mm/min, and the breaking elongation (%) of the recycled plastic is measured.
The high temperature resistance is measured according to GB 1035-70, and the temperature (DEG C) of the recycled plastic reaches certain bending deformation in a constant temperature rising environment.
TABLE 1 test results table
| Item | Oxidation induction time (min) | Elongation at Break (%) | Deformation temperature (. degree. C.) |
| Example 1 | 35.46 | 300.5 | 450.36 |
| Example 2 | 35.55 | 302.4 | 451.21 |
| Example 3 | 38.12 | 315.8 | 455.37 |
| Example 4 | 36.49 | 309.7 | 452.11 |
| Example 5 | 36.09 | 309.5 | 451.36 |
| Example 6 | 42.12 | 323.1 | 475.27 |
| Example 7 | 43.05 | 324.5 | 475.33 |
| Example 8 | 45.08 | 330.5 | 479.14 |
| Example 9 | 46.11 | 329.8 | 480.28 |
| Example 10 | 45.23 | 325.7 | 491.64 |
| Example 11 | 46.01 | 326.1 | 492.05 |
| Comparative example 1 | 10.26 | 182.7 | 220.49 |
| Comparative example 2 | 25.19 | 251.6 | 380.77 |
| Comparative example 3 | 24.37 | 250.3 | 375.48 |
| Comparative example 4 | 25.08 | 251.2 | 376.12 |
| Comparative example 5 | 25.22 | 252.0 | 376.14 |
| Comparative example 6 | 29.11 | 255.7 | 385.19 |
As can be seen from Table 1, the oxidation induction time, the elongation at break and the deformation temperature of examples 1-5 are all higher than those of comparative example 1, which illustrates that the addition of nano-silica, nano-alumina, a hyperdispersant, 1-ethyl-3-methylimidazole dimethyl phosphate, basalt fiber, flavanonoside, microcrystalline cellulose and wood flour to the recycled plastic according to the ranges of examples 1-5 can comprehensively enhance the oxidation resistance, the mechanical properties and the heat resistance of the recycled plastic, so that the prepared recycled plastic has higher ozone resistance, the mechanical properties and the heat resistance, wherein the ozone resistance, the heat resistance and the mechanical properties of the recycled plastic prepared in example 3 are the best;
the oxidation induction time, the elongation at break and the deformation temperature of the examples 6-7 are all higher than those of the example 3, which shows that the ozone resistance, the mechanical property and the heat resistance of the recycled plastic can be improved by utilizing the synergistic effect of the nano silicon dioxide and the nano aluminum oxide by controlling the weight ratio of the nano silicon dioxide to the nano aluminum oxide within the range;
the oxidation induction time, the elongation at break and the deformation temperature of the examples 8-9 are all higher than those of the example 3, which shows that the compatibility of the nano-silica with other components in the recycled plastic can be improved by modifying the nano-silica, so that the nano-silica can fully play a role in the recycled plastic, and the ozone resistance, the mechanical property and the heat resistance of the recycled plastic are improved;
the oxidation induction time, the elongation at break and the deformation temperature of the examples 10-11 are all higher than those of the example 3, which shows that the nano-alumina is modified to improve the dispersibility of the nano-alumina in the recycled plastic and enable the nano-alumina to be better filled in the recycled plastic, so that the ozone resistance, the mechanical property and the heat resistance of the recycled plastic are improved;
comparative examples 2 to 5, in which the oxidation induction time, the elongation at break and the deformation temperature were lower than those of example 3, demonstrated that the synergistic effect with the nano-silica could not be exerted without adding nano-alumina, and that the synergistic effect with each other could not be sufficiently exerted without adding any one of 1-ethyl-3-methylimidazolium phosphate dimethyl ester salt, flavanonoside and microcrystalline cellulose, thereby reducing the ozone resistance, mechanical properties and heat resistance of the recycled plastic;
the oxidation induction time, the elongation at break and the deformation temperature of the comparative example 6 are all lower than those of the example 3, which shows that the oxidation resistance, the heat resistance and the mechanical property of the glass fiber are poorer than those of the basalt fiber, and the nano-silica can enhance the performance of the basalt fiber, so that the ozone resistance, the mechanical property and the heat resistance of the recycled plastic can be reduced by replacing the basalt fiber with the glass fiber.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. An ozone-resistant recycled plastic is characterized in that: the raw materials comprise the following components in parts by weight: 76.79-82.79 parts of recycled polystyrene, 6.97-12.97 parts of polystyrene, 8.00-11.94 parts of polystyrene butadiene copolymer, 0.08-0.18 part of carbon black, 0.10-0.16 part of magnesium stearate, 5.72-7.72 parts of basalt fiber, 8-12 parts of nano silicon dioxide, 11.8-13.8 parts of nano aluminum oxide, 14.68-16.68 parts of wood powder, 0.035-0.045 part of hyperdispersant, 0.15-0.25 part of 1-ethyl-3-methylimidazole dimethyl phosphate, 0.1-0.2 part of dihydroflavone glycoside and 0.08-0.10 part of microcrystalline cellulose.
2. The ozone-resistant recycled plastic as claimed in claim 1, wherein: the raw materials comprise the following components in parts by weight: 79.00-80.58 parts of recycled polystyrene, 8.97-10.97 parts of polystyrene, 9.00-10.94 parts of polystyrene butadiene copolymer, 0.10-0.16 part of carbon black, 0.11-0.15 part of magnesium stearate, 6.00-7.44 parts of basalt fiber, 9.5-10.5 parts of nano silicon dioxide, 12.0-13.6 parts of nano aluminum oxide, 15.00-16.36 parts of wood powder, 0.038-0.042 parts of hyper-dispersant, 0.18-0.22 part of 1-ethyl-3-methylimidazole dimethyl phosphate, 0.13-0.17 part of flavanone glycoside and 0.085-0.095 part of microcrystalline cellulose.
3. The ozone-resistant recycled plastic as claimed in claim 1, wherein: the weight ratio of the nano silicon dioxide to the nano aluminum oxide is 1: (1.25-1.35).
4. An ozone resistant recycled plastic as claimed in claim 1 or 2, wherein: the nano silicon dioxide is prepared by the following method:
uniformly mixing ethanol, water, tetraethyl orthosilicate and ammonia water, stirring and reacting for 7.5-8.5h at the temperature of 26-28 ℃ and the rotating speed of 290-310r/min, centrifuging, washing, drying at the temperature of 62-64 ℃, and grinding to obtain the nano silicon dioxide, wherein the weight ratio of the ethanol to the water to the tetraethyl orthosilicate to the ammonia water is (46-50): (0.6-1.0): (0.7-1.0): (3.6-3.9).
5. The ozone-resistant recycled plastic as claimed in claim 4, wherein: the nano silicon dioxide is modified by adopting the following method:
drying the nano-silica at the temperature of 120-125 ℃, mixing with ethanol, performing ultrasonic dispersion for 30-35min to obtain nano-silica suspension with the mass concentration of 4.8-5.0%, mixing with dichlorodimethylsilane, refluxing for 50-60min at the temperature of 130-132 ℃, washing, and drying at the temperature of 120-122 ℃ to obtain the modified nano-silica, wherein the weight ratio of the nano-silica suspension to the dichlorodimethylsilane is 1: (0.075-0.080).
6. An ozone resistant recycled plastic as claimed in claim 1 or 2, wherein: the nano alumina is modified by adopting the following method:
firstly, drying nano alumina for 1.5-2.0h at the temperature of 118-122 ℃, then mixing the dried nano alumina with ethanol, ultrasonically dispersing for 25-30min, then dropwise adding a silane coupling agent at the temperature of 80-90 ℃, reacting for 50-55min, cooling to 20-23 ℃, washing for 2-3 times, pouring out supernatant, and drying for 11-12h at the temperature of 80-82 ℃ to obtain modified nano alumina; wherein the weight ratio of the nano alumina to the ethanol is 1: (13-15); the weight ratio of the nano alumina to the silane coupling agent is 1: (0.02-0.03).
7. The ozone-resistant recycled plastic as claimed in claim 1, wherein: the hyperdispersant comprises acrylic acid and allyl alcohol, wherein the weight ratio of the acrylic acid to the allyl alcohol is (8-12): (10-14).
8. A process for preparing an ozone-resistant recycled plastic as claimed in any one of claims 1 to 7, wherein the process comprises the following steps: the method comprises the following steps:
s1: drying all the raw materials at the temperature of 155-165 ℃ for 1.5-2.5 h;
s2: mixing the dried raw materials at a rotation speed of 45-55r/min for 10-15min to obtain a mixture;
s3: and melting, blending and extruding the mixture to obtain the recycled plastic.
9. The process for processing the ozone-resistant recycled plastic as claimed in claim 8, wherein the process comprises the following steps: the device used in the step S3 is a screw extruder; the temperature of each section of the screw extruder is as follows: the temperature of the head is 215-; the rotating speed of the screw in the screw extruder is 1590-1610 r/min.
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