CN113980416A - Plastic product containing composite catalyst and preparation method thereof - Google Patents
Plastic product containing composite catalyst and preparation method thereof Download PDFInfo
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- CN113980416A CN113980416A CN202111363520.5A CN202111363520A CN113980416A CN 113980416 A CN113980416 A CN 113980416A CN 202111363520 A CN202111363520 A CN 202111363520A CN 113980416 A CN113980416 A CN 113980416A
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- composite catalyst
- adsorbent
- catalyst
- matrix resin
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- 239000003054 catalyst Substances 0.000 title claims abstract description 200
- 239000002131 composite material Substances 0.000 title claims abstract description 184
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- 239000004033 plastic Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 74
- 239000011347 resin Substances 0.000 claims abstract description 74
- 239000011159 matrix material Substances 0.000 claims abstract description 66
- 239000003463 adsorbent Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000002844 melting Methods 0.000 claims abstract description 26
- 230000008018 melting Effects 0.000 claims abstract description 26
- 238000001746 injection moulding Methods 0.000 claims abstract description 24
- 239000011941 photocatalyst Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000006185 dispersion Substances 0.000 claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 61
- 239000000047 product Substances 0.000 claims description 59
- 239000000463 material Substances 0.000 claims description 53
- 238000007906 compression Methods 0.000 claims description 38
- 230000006835 compression Effects 0.000 claims description 38
- 229910052799 carbon Inorganic materials 0.000 claims description 34
- 239000000243 solution Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 22
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 230000001590 oxidative effect Effects 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- UPWOEMHINGJHOB-UHFFFAOYSA-N oxo(oxocobaltiooxy)cobalt Chemical group O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 claims description 10
- 238000010008 shearing Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000004155 Chlorine dioxide Substances 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 8
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 8
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 8
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 7
- 229910002254 LaCoO3 Inorganic materials 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229910052809 inorganic oxide Inorganic materials 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 7
- 239000013543 active substance Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 229910002370 SrTiO3 Inorganic materials 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229920005992 thermoplastic resin Polymers 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 19
- 238000006731 degradation reaction Methods 0.000 abstract description 19
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- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract 1
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 5
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- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 4
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- 238000002835 absorbance Methods 0.000 description 1
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- STZCRXQWRGQSJD-UHFFFAOYSA-M sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate Chemical compound [Na+].C1=CC(N(C)C)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-UHFFFAOYSA-M 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/12—Adsorbed ingredients, e.g. ingredients on carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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- C08K3/22—Oxides; Hydroxides of metals
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
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- C08K2003/2231—Oxides; Hydroxides of metals of tin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The scheme discloses a plastic product containing a composite catalyst and a preparation method thereof, belonging to the technical field of environment-friendly products, wherein the plastic product containing the composite catalyst is prepared by melting, mixing and extrusion molding 95.0-99.5 parts by weight of matrix resin and 0.5-5.0 parts by weight of the composite catalyst taking an adsorbent as a carrier; wherein the composite catalyst comprises a photocatalyst, a dark catalyst and an adsorbent in a weight ratio of 1:1: 98; in this scheme, carry out composite treatment with photocatalyst, dark catalyst and adsorbent earlier, make the three be in the symbiotic state and play the synergistic effect of promoting, add the composite catalyst from the feed arrangement who is close to injection molding machine measurement section, not only make the carrier adsorbent of composite catalyst obtain great reservation at the complete performance of preparation in-process size, still make the selective dispersion of some composite catalyst on the top layer of plastics, improved the content of top layer composite catalyst to great improvement ABS goods surface degradation VOC's efficiency.
Description
Technical Field
The invention belongs to the technical field of environment-friendly products, and particularly relates to a plastic product containing a composite catalyst and a preparation method thereof.
Background
The plastic has the advantages of light density, easy molding, corrosion resistance, high cost performance and the like, and is widely applied to the fields of automobiles, household appliances, buildings, office equipment, machinery and the like. However, the use of plastics in large quantities also causes problems, mainly due to environmental pollution and harm to human health, such as VOC pollution. In closed and semi-closed environments such as indoor, in-car, roadway and spraying workshop, VOC seriously harms the health of people. This problem has attracted attention from governments, large-scale production enterprises at home and abroad, and resin manufacturers.
In the past decades, considerable researchers have done much work on removing VOCs, and at present, there are several ways to remove VOCs in closed and semi-closed environments (1) to open windows as much as possible for ventilation without affecting safety during use. (2) The adsorption material has the characteristics of porous adsorption, can be subjected to physical adsorption and chemical adsorption, so that the VOC is adsorbed on the surface of the porous adsorption material, thereby achieving the purification effect. (3) The photocatalyst material is used for photocatalytic degradation treatment of pollutants, and the principle is that free radicals of oxidation-reduction reaction are generated under the action of ultraviolet light, so that VOC is decomposed, and meanwhile, certain sterilization capacity is achieved.
Although the above three methods have certain effects, there are the following problems: (1) the ventilation mode has certain limitation, for example, in summer and winter, the mode of windowing and ventilating indoors is unrealistic to remove VOC, and in the high-speed running automobile, the mode of windowing and ventilating indoors is unrealistic to remove VOC; (2) the adsorption mode of activated carbon and the like is adopted to remove VOC, so that the problem of saturated adsorption exists, and if the desorption treatment is not carried out in the modes of insolation or air convection and the like in time, the problem of desorption occurs, so that the VOC removing effect is seriously reduced and even aggravated; (3) the photocatalyst material is adopted to carry out composite catalytic degradation treatment on the VOC, and the photocatalyst material can carry out photocatalytic degradation only by irradiation of light, particularly ultraviolet light, and most of indoor light is weak, so that the photocatalytic effect is poor. In addition, the method of the dark catalyst is adopted, the dark catalyst realizes the catalytic degradation of VOC of the discharge material or the oxidant through the obvious change of the environmental temperature, and the used oxidant or the discharge material has the service life and the environmental temperature change is not large, so that the VOC and the odor can not be degraded durably and efficiently. The conventional modification method is to compound resin and a composite catalyst containing a photocatalyst and a dark catalyst, extrude the compound catalyst environment-friendly material to prepare the composite catalyst plastic product, and then prepare the composite catalyst plastic product through injection molding, but the effect is limited. This is because the composite catalyst is uniformly dispersed in the resin during the material mixing process, the extrusion process and the injection molding process, and the composite catalyst dispersed on the surface and directly contacting with the external VOC has relatively low content, so that the effect of degrading VOC and odor is not good enough.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a plastic product containing a composite catalyst and a preparation method thereof.
The plastic product containing the composite catalyst is prepared by melting, mixing and extrusion molding 95.0-99.5 parts by weight of matrix resin and 0.5-5.0 parts by weight of the composite catalyst taking an adsorbent as a carrier; wherein the composite catalyst comprises 0.5-2: 96-99 weight ratio of photocatalyst, dark catalyst and adsorbent;
the photocatalyst is TiO2、ZnO、CdS、WO3、PbS、SnO2、ZnS、SrTiO3、SiO2One or more of the compositions have the particle size of 5-20 nm;
the dark catalyst comprises an inorganic oxide and an oxidant in a weight ratio of 1:99, wherein the inorganic oxide is Co2O3,Co3O4,LaCoO3One or a mixture of more than two of the above, the particle size is 5-20 nm; the oxidant is one or a mixture of more than two of chlorine dioxide, potassium persulfate and sodium persulfate;
the adsorbent is one of nano-scale diatomite, zeolite, activated alumina, activated carbon and silica gel, and the pore diameter is 20 nm-500 nm.
Further, the matrix resin is a thermoplastic resin.
Further, the composite catalyst is made of TiO2Photocatalyst, Co2O3Potassium persulfate and active carbon, wherein the aperture of the active carbon is 20nm-50 nm.
The preparation method of the plastic product containing the composite catalyst comprises the following steps:
A. preparing raw materials according to parts by weight, namely matrix resin: 95.0-99.5 parts of a composite catalyst taking an adsorbent as a carrier: 0.5-5.0 parts; the preparation method of the composite catalyst comprises the following steps: (1) taking a photocatalyst and a dark catalyst according to the weight ratio, adding an active agent and 1000mL of deionized water solution, and uniformly stirring to obtain a dispersion solution; (2) adding the adsorbent into the dispersion solution according to the weight ratio, stirring, standing until the upper layer of the solution is clear, filtering out a precipitate, washing with deionized water, and drying to obtain the composite catalyst material taking the adsorbent as a carrier;
B. adding matrix resin into an injection molding machine, conveying the matrix resin from a feeding section to a compression section by a screw rod in the injection molding machine for heating, shearing and melting, and adding a composite catalyst material at the tail end of the compression section;
C. and after being fully melted, the matrix resin and the composite catalyst material enter a metering section to be fully mixed and pressurized, then enter a mold through a nozzle and a pouring gate, and finally are cooled, pressure-maintained and molded to obtain the plastic product containing the composite catalyst.
Furthermore, the temperature of the feeding section of the injection molding machine is 10-30 ℃ lower than the melting point of the matrix resin, the temperature of the compression section is 10-20 ℃ higher than the melting point of the matrix resin, the temperature of the metering section is 5-20 ℃ higher than the temperature of the tail end of the compression section, the temperature of each section of the machine barrel is gradually increased along the screw screwing direction, and the temperature of the nozzle end is 5-10 ℃ lower than the temperature of the tail end of the metering section.
Further, the temperature of the feeding section is 190-210 ℃, the temperature of the compression section is 210-220 ℃, the temperature of the metering section is 220-235 ℃, and the temperature of the nozzle end is 215-.
Further, the drying temperature for preparing the composite catalyst in the step A is 100 ℃, and the time is 12 hours.
Compared with a photocatalyst plastic product and a composite catalyst plastic product prepared by a traditional processing mode, the plastic product containing the composite catalyst and the preparation method thereof disclosed by the invention have the following advantages:
(1) the composite catalyst plastic product prepared by the invention can decompose VOC outside and inside the plastic in the absence of light due to the existence of the photocatalyst and the dark catalyst, so that the use environment of the composite catalyst completely gets rid of the limitation of illumination; meanwhile, due to the existence of the carrier adsorbent, the VOC is easily adsorbed around the composite catalyst, the efficiency of the catalytic degradation of the VOC is further improved, and the durable and efficient catalytic degradation of the VOC is realized.
(2) The composite catalyst is added into the molten plastic melt between the compression section and the metering section, the mixing effect can be achieved by mainly utilizing the fact that the screw in the section has weak shearing capacity, the interaction time is short, strong shearing damage of the screw to the composite catalyst is avoided, and the composite catalyst and the resin melt are prevented from being dispersed more uniformly. The integrity and the size of the adsorbent forming the composite catalyst can be greatly reserved, and the size retention rate is improved to more than 70 percent from about 35 percent of the traditional extrusion processing. Due to the short interaction time, the composite catalyst has no time to migrate to the inner layer of the resin melt, and the bulk density of the composite catalyst (0.32-0.65 g/cm)3) Specific to the resin solution (0.9-1.4 g/cm)3) The composite catalyst is small, so that a considerable part of the composite catalyst is dispersed on the surface layer of the resin solution and is finally mostly solidified on the surface layer of the plastic product, selective dispersion is realized, the composite catalyst content of the surface layer of the plastic product is improved, and the catalytic degradation VOC of the prepared plastic product is greatly improved according to the principle that the higher the composite catalyst content is, the stronger the degradation capability is. VOC is adsorbed around the plastic product by the adsorbent, so that the VOC degrading efficiency of the composite catalyst is further improved.
(3) The plastic product containing the composite catalyst prepared by the invention has scratch resistance greatly superior to that of a composite catalyst coating formed by spraying, and can degrade VOC for a long time.
(4) The scheme also provides a preparation method of the composite catalyst, the composite catalyst taking the adsorbent as the carrier is obtained by the preparation method, the VOC adsorbed by the adsorbent can be continuously decomposed, and the problem of adsorption saturation does not exist in the adsorbent due to continuous decomposition, so that the adsorption efficiency is greatly improved, the good synergistic effect of the adsorbent and other components of the composite catalyst is just good, the VOC in the material is continuously and effectively decomposed and reduced, and the catalytic degradation efficiency is high. In the prior art, the blend of the oxidant, the oxide, the adsorbent and the like is added together, and the dispersion of the blend is difficult to realize the symbiotic state of the oxidant, the oxide and the adsorbent in the blending process of the material, so that the effect is poor.
Drawings
FIG. 1 is a schematic structural diagram of an injection molding machine for preparing a composite catalyst environment-friendly plastic product with an adsorbent as a carrier according to the present invention;
FIG. 2 is a schematic structural diagram of a photocatalyst feeding device according to the present invention;
FIG. 3 is a schematic diagram of the photocatalyst feeding device of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
the device comprises a motor 1, an oil cylinder 2, a hopper 3, a feeding drawer 4, a heating ring 5, a feeding device 6, a screw 7, a nozzle 8, a pouring gate 9, a fixed die 10 and a movable die 11.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Example 1, an injection molding machine for preparing a composite catalyst environment-friendly plastic product with an adsorbent as a carrier, as shown in fig. 1, 2 and 3, comprises a motor 1, an oil cylinder 2, a cylinder and a mold which are connected with each other, a screw 7 which is matched with the cylinder to work is installed in the cylinder, a heating ring 5 which is convenient for heating and melting materials in the cylinder is wound outside the cylinder, and the cylinder consists of a feeding section, a compression section and a metering section; the feeding section front end sets up the hopper 3 of the base member resin feeding of being convenient for, and 3 lower parts of hopper can be dismantled, installs the reinforced drawer 4 that the step opened and closed of the material of being convenient for feeds in raw material, and the compression section end sets up the feed arrangement 6 of the compound catalyst feeding of being convenient for, and measurement section end is installed the nozzle 8 and is linked to each other, and the nozzle 8 communicates with each other with runner 9 on the mould, and the mould is including cover half 10 and movable mould 11 that the cooperation was used, and nozzle 8 is connected with cover half 10 and movable mould 11 in proper order through runner 9.
The feeding device 6 comprises a weightlessness scale and a storage bin with a gate valve at the bottom, the gate valve is in signal connection with the weightlessness scale, the bottom of the storage bin is connected with a scale bin, sensors in signal connection with the weightlessness scale are mounted on two sides of the scale bin, the bottom of the scale bin is connected with a vibration feeding mechanism, an electromagnetic vibration exciter and a driving tank body are mounted between the weightlessness scale and the vibration feeding mechanism, and the electromagnetic vibration exciter is connected with the driving tank body. The vibration feeding mechanism comprises a vibration bin communicated with the weighing bin, a vibration slideway arranged at the bottom of the vibration bin and a vibrator arranged on the vibration bin and in signal connection with the electromagnetic vibration exciter. The vibration feeding mechanism conveys materials horizontally forwards by using the principle of electromagnetic vibration. The electromagnetic vibration exciter drives a vibration bin on the vibration feeding mechanism to vibrate and discharge through the driving groove body.
When the sensors on the two sides of the weighing bin detect that the material is lower than a preset lower limit, opening the gate valve to feed the material from the storage bin; when the sensors on the two sides of the material weighing bin detect that the material is higher than the preset upper limit, the gate valve is closed to stop feeding. When the material flow is greater than a set value, the sensor of the material weighing bin sends a signal to reduce the vibration frequency of the electromagnetic vibration exciter, so that the feeding amount of the vibration feeding mechanism is reduced, and when the material flow is less than the set value, the sensor of the material weighing bin sends a signal to improve the vibration frequency of the electromagnetic vibration exciter, so that the feeding amount of the vibration feeding mechanism is improved until the material flow is balanced. The injection molding machine solves the problem that the traditional mode that low-content (0.1% -2.0%) materials or auxiliaries can only be fed after being mixed with high-content materials is adopted, realizes online high-precision independent feeding, and greatly improves the content precision and the feeding stability in the materials. The electromagnetic vibration exciter adjusts the vibration speed of the vibrator on the vibration storage bin according to the flow of the material, the damage to the integrity of the adsorbent of the composite catalyst carrier in the rotating feeding process of the traditional screw 7 is reduced, the composite catalyst can be stably distributed in the plastic, the integrity of the size of the adsorbent is greatly improved, and the photocatalytic efficiency can be greatly improved.
The photocatalyst in the examples 2 to 4 and the comparative examples 1 to 4 of the present invention is TiO with a particle size of 10nm2The inorganic oxide is Co with the particle diameter of 10nm2O3The oxidant is potassium persulfate powder, and the adsorbent is activated carbon with the aperture of 20-50 nm.
The preparation steps of the composite catalyst in embodiments 2 to 4 are as follows: 0.5g of TiO was taken2Photocatalyst and 0.5g of dark catalyst (dark catalyst consisting of 1g of Co having a particle size of 10 nm)2O3And 99g of potassium persulfate powder) and adding an active agent and 1000mL of deionized water solution, and uniformly stirring to obtain a dispersion solution; (2) adding 99g of activated carbon (the aperture is 20-50 nm) into the dispersion solution, stirring, standing until the upper layer of the solution is clear, filtering out a precipitate, washing with deionized water, and drying to obtain the composite catalyst material taking the adsorbent as a carrier.
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 99.5 parts of composite catalyst with active carbon as a carrier: 0.5 part.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 210 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 215 ℃, and at the tail end of the compression section, the composite catalyst taking active carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 235 ℃, feeding the melted materials into a mold through a nozzle and a pouring gate, and finally cooling, pressure maintaining and forming to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 230 ℃.
Embodiment 3, a method for preparing a plastic product containing a composite catalyst, comprising the steps of:
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 98 parts of active carbon as a carrier composite catalyst: and 2 parts.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 190 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 210 ℃, and at the tail end of the compression section, the composite catalyst taking activated carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 220 ℃, feeding the fully melted ABS matrix resin and the composite catalyst into a mold through a nozzle and a pouring gate, and finally cooling, pressure maintaining and molding to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 215 ℃.
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 95 parts of active carbon as a carrier composite catalyst: 5 parts of the raw materials.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 205 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 220 ℃, and at the tail end of the compression section, the composite catalyst taking active carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 230 ℃, feeding the fully melted ABS matrix resin and the composite catalyst into a mold through a nozzle and a sprue, and finally cooling, pressure maintaining and molding to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 225 ℃.
In examples 5 to 7 and comparative examples 5 to 8 of the present invention, the photocatalyst is CdS having a particle size of 10nm and the inorganic oxide is Co having a particle size of 10nm3O4The oxidant is sodium persulfate, and the adsorbent is activated carbon with the pore diameter of 20nm-50 nm.
The preparation steps of the composite catalyst in examples 5 to 7: taking 1.0g CdS photocatalyst and 1.0g dark catalyst (the dark catalyst is composed of 1g Co with particle size of 10nm3O4And 99g of sodium persulfate powder) and adding an active agent and 1000mL of deionized water solution, and uniformly stirring to obtain a dispersion solution; (2) adding 98g of activated carbon (the aperture is 20-50 nm) into the dispersion solution, stirring, standing until the upper layer of the solution is clear, filtering out a precipitate, washing with deionized water, and drying to obtain the composite catalyst material taking the adsorbent as a carrier;
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 99.5 parts of composite catalyst with active carbon as a carrier: 0.5 part.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 210 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 215 ℃, and at the tail end of the compression section, the composite catalyst taking active carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 235 ℃, feeding the melted materials into a mold through a nozzle and a pouring gate, and finally cooling, pressure maintaining and forming to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 230 ℃.
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 98 parts of active carbon as a carrier composite catalyst: and 2 parts.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 190 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 210 ℃, and at the tail end of the compression section, the composite catalyst taking activated carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 220 ℃, feeding the fully melted ABS matrix resin and the composite catalyst into a mold through a nozzle and a pouring gate, and finally cooling, pressure maintaining and molding to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 215 ℃.
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 95 parts of active carbon as a carrier composite catalyst: 5 parts of the raw materials.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 205 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 220 ℃, and at the tail end of the compression section, the composite catalyst taking active carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 230 ℃, feeding the fully melted ABS matrix resin and the composite catalyst into a mold through a nozzle and a sprue, and finally cooling, pressure maintaining and molding to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 225 ℃.
The photocatalyst in the examples 8 to 10 and the comparative examples 9 to 12 of the present invention is SnO having a particle size of 10nm210nm of inorganic oxide LaCoO3The oxidant is chlorine dioxide powder, and the adsorbent is activated carbon with the aperture of 20-50 nm.
The preparation steps of the composite catalyst in embodiments 8 to 10: (1) 2g of SnO2Photocatalyst and 2g of dark catalyst (dark catalyst consisting of 1g of LaCoO having a particle size of 5 nm)3And 99g of chlorine dioxide powder) and adding an active agent and 1000mL of deionized water solution, and uniformly stirring to obtain a dispersion solution; (2) taking 96gAdding the activated carbon (the aperture is 20nm-50 nm) into the dispersion solution, stirring, standing until the upper layer of the solution is clear, filtering out a precipitate, washing with deionized water, and drying to obtain the composite catalyst material taking the adsorbent as a carrier;
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 99.5 parts of composite catalyst with active carbon as a carrier: 0.5 part.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 210 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 215 ℃, and at the tail end of the compression section, the composite catalyst taking active carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 235 ℃, feeding the melted materials into a mold through a nozzle and a pouring gate, and finally cooling, pressure maintaining and forming to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 230 ℃.
Example 9, a method for preparing a plastic article containing a composite catalyst, comprising the steps of:
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 98 parts of active carbon as a carrier composite catalyst: and 2 parts.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 190 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 210 ℃, and at the tail end of the compression section, the composite catalyst taking activated carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 220 ℃, feeding the fully melted ABS matrix resin and the composite catalyst into a mold through a nozzle and a pouring gate, and finally cooling, pressure maintaining and molding to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 215 ℃.
Example 10, a method for preparing a plastic article containing a composite catalyst, comprising the steps of:
A. preparing raw materials according to parts by weight, namely ABS matrix resin: 95 parts of active carbon as a carrier composite catalyst: 5 parts of the raw materials.
B. Adding ABS matrix resin into an injection molding machine through a hopper, and enabling the matrix resin to firstly pass through a feeding section of a machine barrel through a screw, wherein the temperature of the feeding section of the machine barrel is 205 ℃; then the mixture enters a compression section (melting section) of a machine barrel to be heated, sheared and melted, the temperature of the compression section is 220 ℃, and at the tail end of the compression section, the composite catalyst taking active carbon as a carrier enters through a composite catalyst feeding device shown in figure 2; the rate of composite catalyst addition is set by the control system as shown in FIG. 3.
C. Fully melting ABS matrix resin, feeding the fully melted ABS matrix resin and a composite catalyst into a metering section to promote mixing and pressurization of the melted materials, wherein the temperature of the metering section is 230 ℃, feeding the fully melted ABS matrix resin and the composite catalyst into a mold through a nozzle and a sprue, and finally cooling, pressure maintaining and molding to obtain the ABS product with VOC and odor removed by the composite catalyst, wherein the temperature of the nozzle end is 225 ℃.
In order to examine the performance of the composite catalyst ABS product prepared by the invention, a plurality of groups of comparative examples are designed and compared with the examples, as shown in tables 1, 3 and 5, a standard test sample strip mold is placed in an injection molding machine, and injection molding is carried out according to the conventional injection molding process conditions to form a standard test sample strip for carrying out the following performance tests.
The composite catalytic degradation test is to decompose methyl orange in a methyl orange suspension by using a composite catalyst ABS product indoors. The specific process comprises the following steps: adding a certain amount of composite catalyst ABS product into a quartz test tube filled with a 50m methyl orange aqueous solution with the concentration of 10mg/L, and introducing air into the solution by using an air pump, wherein the flow rate of the composite catalyst ABS product is 220 mL/min. After the composite catalytic reaction is carried out for a certain time, the concentration of the solution in the reaction process changesMeasuring 490cm with ultraviolet and visible spectrophotometer-1The absorbance value of the solution is analyzed by linear regression, the apparent reaction rate constant of the methyl orange solution decolorization when different catalysts are used under various conditions can be obtained, and the methyl orange concentration change rate is calculated for judging and comparing the activity of the catalysts. Specifically, as shown in tables 2, 4 and 6:
TABLE 1 examples and comparative example formulations, TiO2/Co2O3Forming design of/potassium persulfate/activated carbon composite catalyst feeding and coating
Of these, TiO of comparative example 22/Co2O3The preparation method of the/potassium persulfate/activated carbon composite catalyst ABS product comprises the following steps:
A. TiO using active carbon as carrier2/Co2O3Mixing the potassium persulfate composite catalyst, polyvinyl alcohol and water according to the mass ratio of 5.0:30:65, and shearing and dispersing in a high-speed shearing machine to obtain the composite medium nano composite material emulsion.
B. And (3) applying the emulsion on the surface of the ABS product by adopting a spraying process to obtain the composite catalyst nano coating.
TABLE 2 TiO in the examples and comparative examples2/Co2O3Performance and degradation efficiency of/potassium persulfate/activated carbon composite catalyst ABS product
TABLE 3 example and comparative example formulations, CdS/Co3O4Forming design of/sodium persulfate/activated carbon composite catalyst feeding and coating
Of these, CdS/Co of comparative example 63O4The preparation method of the/sodium persulfate/activated carbon composite catalyst ABS product comprises the following steps:
A. CdS/Co with activated carbon as carrier3O4Mixing the sodium persulfate composite catalyst, polyvinyl alcohol and water according to the mass ratio of 5.0:30:65, and shearing and dispersing in a high-speed shearing machine to obtain the composite medium nano composite material emulsion.
B. And (3) applying the emulsion on the surface of the ABS product by adopting a spraying process to obtain the composite catalyst nano coating.
TABLE 4 CdS/Co in the examples and comparative examples3O4Sodium persulfate/active carbon composite catalyst ABS product performance and degradation efficiency
TABLE 5 examples and comparative example formulations, SnO2/LaCoO3Shaping design of/chlorine dioxide/active carbon composite catalyst feeding and coating
Of those, SnO of comparative example 102/LaCoO3The preparation method of the/chlorine dioxide/active carbon composite catalyst ABS product comprises the following steps:
A. SnO using active carbon as carrier2/LaCoO3Mixing the chlorine dioxide composite catalyst, polyvinyl alcohol and water according to the mass ratio of 5.0:30:65, and shearing and dispersing the mixture in a high-speed shearing machine to prepare the composite medium nano composite material emulsion.
B. And (3) applying the emulsion on the surface of the ABS product by adopting a spraying process to obtain the composite catalyst nano coating.
Table 6 SnO in examples and comparative examples2/LaCoO3ABS product performance and degradation efficiency of chlorine dioxide/active carbon composite catalyst
From the comparison between table 1 and table 2, it can be found that the composite catalytic degradation efficiency of examples 2 to 4 is greatly improved, the impact toughness and the elongation at break are improved, and the same rule is found in table 4 and table 6, compared with comparative example 1. In the comparative example 2, the composite catalyst taking the adsorbent as the carrier is added from the main feeding port, and the integrity of the adsorbent is easily damaged due to the extrusion of the screw and the granules, so that the adsorption capacity of the adsorbent is reduced, and the overall catalytic degradation efficiency is greatly influenced. The main reason is that the composite catalyst is added from a feeding device close to a metering section of an injection molding machine in the preparation process of the plastic product for removing VOC and odor by adopting the composite catalyst, so that the integrity of the size of a carrier adsorbent of the composite catalyst is greatly reserved in the preparation process, a considerable part of the composite catalyst is selectively dispersed on the surface layer of the plastic, the content of the composite catalyst on the surface layer is improved, and the efficiency of degrading VOC on the surface of the ABS product is greatly improved; by adopting the method, the total addition amount of the composite catalyst is less, and the impact toughness and the elongation at break of the composite material are improved compared with the traditional method.
Examples 2 to 4 had lower degradation efficiency than comparative example 2, but the scratch resistance was better, and the same rules were found in tables 4 and 6. In the comparative example 2, the composite catalyst nano coating is adopted, although the catalytic degradation efficiency is high, under the action of external force, the scratch resistance is poor, the appearance is influenced, and the durability of the catalytic degradation efficiency is also influenced. The main reason is that the composite catalyst coating has more catalysts participating in redox degradation, so that the degradation efficiency is high; however, since the catalyst of comparative example 2 is a coating layer, it has insufficient scratch resistance and inferior durability.
In addition, the addition of the composite catalyst alone (without the carrier adsorbent) has a certain effect in removing low molecular volatile compounds (VOC) and odor, but is very limited, as shown in comparative example 3 in table 2, and the same rules are found in tables 4 and 6.
In the case of increasing the addition amount of the blend of the composite catalyst and the adsorbent, although the VOC removing effect is significantly improved, the material cost is not only greatly increased, but also the ductility and impact toughness of the material are seriously weakened, as shown in comparative example 4 of table 2, and the same rules are found in tables 4 and 6.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. A plastic product containing composite catalyst is characterized in that: the catalyst is prepared by melting, mixing and extrusion molding 95.0-99.5 parts by weight of matrix resin and 0.5-5.0 parts by weight of composite catalyst taking an adsorbent as a carrier; wherein the composite catalyst comprises 0.5-2: 96-99 weight ratio of photocatalyst, dark catalyst and adsorbent;
the photocatalyst is TiO2、ZnO、CdS、WO3、PbS、SnO2、ZnS、SrTiO3、SiO2One or more of the compositions have the particle size of 5-20 nm;
the dark catalyst comprises an inorganic oxide and an oxidant in a weight ratio of 1:99, wherein the inorganic oxide is Co2O3,Co3O4,LaCoO3One or a mixture of more than two of the above, the particle size is 5-20 nm; the oxidizing agentIs one or a mixture of more than two of chlorine dioxide, potassium persulfate and sodium persulfate;
the adsorbent is one of nano-scale diatomite, zeolite, activated alumina, activated carbon and silica gel, and the pore diameter is 20 nm-500 nm.
2. The plastic product containing composite catalyst as claimed in claim 1, wherein: the matrix resin is thermoplastic resin.
3. The plastic product containing composite catalyst as claimed in claim 2, wherein: the composite catalyst is made of TiO2Photocatalyst, Co2O3Potassium persulfate and active carbon, wherein the aperture of the active carbon is 20nm-50 nm.
4. The method for preparing a plastic product containing a composite catalyst according to any one of claims 1 to 3, wherein the method comprises the following steps: the method comprises the following steps:
A. preparing raw materials according to parts by weight, namely matrix resin: 95.0-99.5 parts of a composite catalyst taking an adsorbent as a carrier: 0.5-5.0 parts; the preparation method of the composite catalyst comprises the following steps: (1) taking a photocatalyst and a dark catalyst according to the weight ratio, adding an active agent and 1000mL of deionized water solution, and uniformly stirring to obtain a dispersion solution; (2) adding the adsorbent into the dispersion solution according to the weight ratio, stirring, standing until the upper layer of the solution is clear, filtering out a precipitate, washing with deionized water, and drying to obtain the composite catalyst material taking the adsorbent as a carrier;
B. adding matrix resin into an injection molding machine, conveying the matrix resin from a feeding section to a compression section by a screw rod in the injection molding machine for heating, shearing and melting, and adding a composite catalyst material at the tail end of the compression section;
C. and after being fully melted, the matrix resin and the composite catalyst material enter a metering section to be fully mixed and pressurized, then enter a mold through a nozzle and a pouring gate, and finally are cooled, pressure-maintained and molded to obtain the plastic product containing the composite catalyst.
5. The method for preparing a plastic product containing a composite catalyst as claimed in claim 4, wherein: the temperature of the feeding section is 190-210 ℃, the temperature of the compression section is 210-220 ℃, the temperature of the metering section is 220-235 ℃, and the temperature of the nozzle end is 215-230 ℃.
6. The method for preparing a plastic product containing a composite catalyst as claimed in claim 5, wherein: and (B) drying the composite catalyst prepared in the step (A) at the temperature of 100 ℃ for 12 hours.
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Application publication date: 20220128 |