CN111117116B - Antibacterial agent and wood-plastic composite material - Google Patents
Antibacterial agent and wood-plastic composite material Download PDFInfo
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- CN111117116B CN111117116B CN201911410922.9A CN201911410922A CN111117116B CN 111117116 B CN111117116 B CN 111117116B CN 201911410922 A CN201911410922 A CN 201911410922A CN 111117116 B CN111117116 B CN 111117116B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses an antibacterial agent and a wood-plastic composite material, wherein the antibacterial agent adopts a three-layer structure, the particle diameter of the antibacterial agent is D50<5 mu m, and D90 < 12 mu m. The particle size of the antibacterial agent is controlled, the specific surface area of the antibacterial agent is increased, and the antibacterial effect is improved. The organosilicon quaternary ammonium salt on the outermost layer is adsorbed on the surface of bacteria, and the permeability of bacterial cell walls is changed, so that microorganisms stop the respiratory function and die, thereby achieving the effects of sterilization and bacteriostasis, namely 'contact death'; the contact sterilization does not realize the antibacterial effect, and polyhexamethylene guanidine hydrochloride is adopted to enter a cell membrane to inhibit the synthesis of intramembrane liposome to cause the apoptosis of thalli, thereby achieving the optimal sterilization effect; further, the thiazolinone bactericide destroys DNA molecules in bacterial cells, so that the bacteria lose activity. The sterilization is realized by contacting sterilization and entering cell membranes in sequence, DNA molecules in bacterial cells are further destroyed, and the triple continuous matching antibacterial effect is better.
Description
Technical Field
The invention relates to the technical field of wood-plastic composite materials, in particular to an antibacterial agent and a wood-plastic composite material.
Background
The wood-plastic composite material is a novel composite material which is briskly developed in recent years at home and abroad, and is a plate or a section which is produced by mixing polyethylene, polypropylene, polyvinyl chloride and the like instead of a common resin adhesive with waste plant fibers such as wood powder, rice hulls, straws and the like to form a new wood material and then carrying out plastic processing processes such as extrusion, mould pressing, injection molding and the like. The method is mainly used in industries such as building materials, furniture, logistics packaging and the like. The board is made by mixing plastic and wood powder according to a certain proportion and then performing hot extrusion molding, and is called as an extruded wood-plastic composite board. The PVC wood-plastic composite material is a main type of wood-plastic composite material, namely, the PVC wood-plastic composite material is formed by melting, blending and processing polyvinyl chloride (PVC) and plant fiber materials, is a recyclable material, is green and environment-friendly, has the excellent characteristics of wood and plastic, and can be prepared by adopting an extrusion, pressing or injection molding method.
The existing wood-plastic composite material has the outstanding advantages of water resistance, moisture resistance, corrosion resistance, moth resistance, good comprehensive mechanical property and the like. In the early stages of production and application, it was thought that the plastic matrix used to encapsulate the plant fiber filler prevented fungal attack even without the addition of antimicrobial agents to the composite material, and provided the material with sufficient fungal durability due to the inherent water and corrosion resistance of the plastic matrix. However, with the application and development of the wood-plastic composite material, researches show that the corrosion-resistant and antibacterial lasting performance of the wood-plastic composite material is not as good as expected, and in the middle and later periods of the application of the material, as the plant fibers cannot be completely wrapped and sealed by the plastic matrix, a lot of mildew and decay fungi can harm, infect and even degrade the wood-plastic composite material, so that the service performance and the service life of the wood-plastic composite material are influenced.
Disclosure of Invention
The invention aims to provide an antibacterial agent and a wood-plastic composite material, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
in one aspect, there is provided an antimicrobial agent comprising:
a housing: the shell component is organosilicon quaternary ammonium salt;
a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride;
a core, the core component being isothiazolinone;
and, the particle diameter of the antimicrobial agent is: d50<5 μm, D90 < 12 μm.
Preferably, the weight part ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2.
In another aspect, there is also provided a wood-plastic composite comprising: PVC resin, wood powder, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid, a lubricant and any one of the antibacterial agents.
Preferably, the wood-plastic composite material comprises the following components in parts by weight: 80-120 parts of PVC resin, 15-35 parts of wood powder, 15-35 parts of calcium carbonate, 15-35 parts of a synergist, 1-3 parts of a foaming agent, 5-10 parts of a stabilizer, 1-2 parts of a coupling agent, 6-10 parts of a processing aid, 2-4 parts of a lubricant and 1-3 parts of an antibacterial agent.
Preferably, the wood-plastic composite material comprises the following components in parts by weight: 100 parts of PVC resin, 25 parts of wood powder, 25 parts of calcium carbonate, 25 parts of synergist, 2 parts of foaming agent, 7.5 parts of stabilizer, 1.5 parts of coupling agent, 8 parts of processing aid, 3 parts of lubricant and 2 parts of antibacterial agent.
Preferably, the calcium carbonate is one or a mixture of heavy calcium carbonate, light calcium carbonate and composite calcium carbonate.
Preferably, the stabilizer is one or a mixture of two of a calcium zinc stabilizer and an organic tin stabilizer.
Preferably, the lubricant is one or more of paraffin wax, PE wax, stearic acid and calcium stearate.
Preferably, the preparation method of the wood-plastic composite material comprises the following steps:
spraying the antibacterial agent on the surface of the wood powder;
PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
Compared with the prior art, the invention has the beneficial effects that:
the antibacterial agent adopts a three-layer structure, wherein the shell component is organosilicon quaternary ammonium salt, the middle component is polyhexamethylene guanidine hydrochloride, the core component is isothiazolinone, and the particle diameter of the antibacterial agent is D50<5 mu m and D90 < 12 mu m. By controlling the grain diameter of the antibacterial agent to be D50 less than 5 mu m and D90 less than 12 mu m, the specific surface area of the antibacterial agent particles is increased, the surface effect is improved, the interface effect is enhanced, the compatibility of inorganic matters and polymers is improved, and the antibacterial effect is improved. The further three-layer structure that adopts, the outermost organosilicon quaternary ammonium salt uses organosilicon as the medium, will have ammonium cation group of bactericidal performance to adsorb strongly on the surface of the bacterium, change the permeability of the bacterial cell wall, make enzyme, coenzyme and metabolic intermediate product in the bacterium spill over, cause the microorganism to stop the respiratory function and die, thus reach and sterilize, bacteriostatic the function, have already happened "contact and died"; the contact sterilization does not realize antibiosis, and polyhexamethylene guanidine hydrochloride is adopted to adsorb various bacteria and viruses which are usually electronegative, enter cell membranes, inhibit the synthesis of intramembrane liposomes, cause the apoptosis of thalli and achieve the optimal sterilization effect; further matching with thiazolinone bactericide, destroying DNA molecule in bacterial cell by active part on heterocycle to make bacteria inactive. Continuous gradient antibiosis is realized, contact sterilization, cell membrane sterilization and deeper destruction of DNA molecules in bacterial cells are sequentially realized, and triple continuous cooperation has better antibacterial effect.
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be further described with reference to the following examples, which are only for the purpose of illustrating the present invention and are not to be construed as limiting the scope of the present invention.
Embodiments of the present invention provide, in one aspect, an antimicrobial agent comprising:
a housing: the shell component is organosilicon quaternary ammonium salt;
a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride;
a core, the core component being isothiazolinone;
and, the particle diameter of the antimicrobial agent is: d50<5 μm, D90 < 12 μm.
Specifically, in the above embodiment, the components of the outer layer can be attached to the surface of the components of the inner layer by spraying, that is, the polyhexamethylene guanidine hydrochloride is sprayed and attached to the surface of the organosilicon quaternary ammonium salt, and further the isothiazolinone is sprayed and attached to the surface of the isothiazolinone. Further, the effect of the inner layer or the outer side attachment may be improved by an adhesive. Wherein D50<5 μm indicates that 50 percent of the particles in the antimicrobial agent are less than 5 μm in diameter; d90 < 12 μm indicates that 90 percent of the particles in the antimicrobial agent have a diameter of less than 12 μm.
In one embodiment, the weight part ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2. By controlling the proportion of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone, the performance of the wood-plastic composite material is improved while the excellent sterilization effect is realized.
In a second aspect, an embodiment of the present invention further provides a wood-plastic composite, where the wood-plastic composite includes: PVC resin, wood powder, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid, a lubricant and any one of the antibacterial agents.
The antibacterial agent adopts a three-layer structure, wherein the shell component is organosilicon quaternary ammonium salt, the middle component is polyhexamethylene guanidine hydrochloride, the inner core component is isothiazolinone, and the particle diameter of the antibacterial agent is D50<5 mu m and D90 < 12 mu m. By controlling the grain diameter of the antibacterial agent to be D50 less than 5 mu m and D90 less than 12 mu m, the specific surface area of the antibacterial agent particles is increased, the surface effect is improved, the interface effect is enhanced, the compatibility of inorganic matters and polymers is improved, and the antibacterial effect is improved. The further three-layer structure that adopts, the outermost organosilicon quaternary ammonium salt uses organosilicon as the medium, will have ammonium cation group of bactericidal performance to adsorb strongly on the surface of the bacterium, change the permeability of the bacterial cell wall, make enzyme, coenzyme and metabolic intermediate product in the bacterium spill over, cause the microorganism to stop the respiratory function and die, thus reach and sterilize, bacteriostatic the function, have already happened "contact and died"; the contact sterilization does not realize antibiosis, and polyhexamethylene guanidine hydrochloride is adopted to adsorb various bacteria and viruses which are usually electronegative, enter cell membranes, inhibit the synthesis of intramembrane liposomes, cause the apoptosis of thalli and achieve the optimal sterilization effect; further matching with thiazolinone bactericide, destroying DNA molecule in bacterial cell by active part on heterocycle to make bacteria inactive. Continuous gradient antibiosis is realized, contact sterilization, cell membrane sterilization and deeper destruction of DNA molecules in bacterial cells are sequentially realized, and triple continuous cooperation has better antibacterial effect.
In one embodiment, the wood-plastic composite material comprises the following components in parts by weight: 80-120 parts of PVC resin, 15-35 parts of wood powder, 15-35 parts of calcium carbonate, 15-35 parts of a synergist, 1-3 parts of a foaming agent, 5-10 parts of a stabilizer, 1-2 parts of a coupling agent, 6-10 parts of a processing aid, 2-4 parts of a lubricant and 1-3 parts of an antibacterial agent.
In one embodiment, the wood-plastic composite material comprises the following components in parts by weight: 100 parts of PVC resin, 25 parts of wood powder, 25 parts of calcium carbonate, 25 parts of synergist, 2 parts of foaming agent, 7.5 parts of stabilizer, 1.5 parts of coupling agent, 8 parts of processing aid, 3 parts of lubricant and 2 parts of antibacterial agent.
In one embodiment, the calcium carbonate is one or more of heavy calcium carbonate, light calcium carbonate and composite calcium carbonate.
In one embodiment, the stabilizer is one or a mixture of two of a calcium zinc stabilizer and an organic tin stabilizer.
In one embodiment, the lubricant is a mixture of one or more of paraffin wax, PE wax, stearic acid, and calcium stearate.
In one embodiment, the preparation method of the wood-plastic composite material comprises the following steps: spraying the antibacterial agent on the surface of the wood powder; PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules; by means of spraying, the antibacterial agent can be uniformly contacted with the wood powder, so that the mixing of materials is improved in the mixing process, and the sterilization effect is further improved;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
The following is a detailed description by way of specific examples:
example 1:
the wood-plastic composite material comprises the following components in parts by weight: 80 parts of PVC resin, 35 parts of wood powder, 15 parts of calcium carbonate, 35 parts of a synergist, 1 part of a foaming agent, 10 parts of a stabilizer, 2 parts of a coupling agent, 6 parts of a processing aid, 4 parts of a lubricant and 1 part of an antibacterial agent;
wherein the antimicrobial agent comprises: a housing: the shell component is organosilicon quaternary ammonium salt; a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride; a kernel. The inner core component is isothiazolinone; and, the particle diameter of the antimicrobial agent is: d50<5 μm, D90 < 12 μm. The weight portion ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2.
The calcium carbonate is ground calcium carbonate.
The stabilizer is a calcium zinc stabilizer.
The lubricant is paraffin.
The preparation method of the wood-plastic composite material comprises the following steps: spraying the antibacterial agent on the surface of the wood powder; PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules; by means of spraying, the antibacterial agent can be uniformly contacted with the wood powder, so that the mixing of materials is improved in the mixing process, and the sterilization effect is further improved;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
Example 2:
the wood-plastic composite material comprises the following components in parts by weight: 120 parts of PVC resin, 15 parts of wood powder, 35 parts of calcium carbonate, 15 parts of synergist, 1 part of foaming agent, 10 parts of stabilizer, 1 part of coupling agent, 10 parts of processing aid, 2 parts of lubricant and 3 parts of antibacterial agent;
wherein the antimicrobial agent comprises: a housing: the shell component is organosilicon quaternary ammonium salt; a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride; a kernel. The inner core component is isothiazolinone; and, the particle diameter of the antimicrobial agent is: d50<5 μm, D90 < 12 μm. The weight portion ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2.
The calcium carbonate is light calcium carbonate.
The stabilizer is an organic tin stabilizer.
The lubricant is stearic acid.
The preparation method of the wood-plastic composite material comprises the following steps: spraying the antibacterial agent on the surface of the wood powder; PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules; by means of spraying, the antibacterial agent can be uniformly contacted with the wood powder, so that the mixing of materials is improved in the mixing process, and the sterilization effect is further improved;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
Example 3
The wood-plastic composite material comprises the following components in parts by weight: 100 parts of PVC resin, 25 parts of wood powder, 25 parts of calcium carbonate, 25 parts of synergist, 2 parts of foaming agent, 7.5 parts of stabilizer, 1.5 parts of coupling agent, 8 parts of processing aid, 3 parts of lubricant and 2 parts of antibacterial agent;
wherein the antimicrobial agent comprises: a housing: the shell component is organosilicon quaternary ammonium salt; a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride; a kernel. The inner core component is isothiazolinone; and, the particle diameter of the antimicrobial agent is: d50<5 μm, D90 < 12 μm. The weight portion ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2.
The calcium carbonate is a mixture of heavy calcium carbonate, light calcium carbonate and composite calcium carbonate.
The stabilizer is a mixture of a calcium zinc stabilizer and an organic tin stabilizer.
The lubricant is a mixture of paraffin wax, PE wax, stearic acid and calcium stearate.
The preparation method of the wood-plastic composite material comprises the following steps: spraying the antibacterial agent on the surface of the wood powder; PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules; by means of spraying, the antibacterial agent can be uniformly contacted with the wood powder, so that the mixing of materials is improved in the mixing process, and the sterilization effect is further improved;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
Comparative example 1
The wood-plastic composite material comprises the following components in parts by weight: 100 parts of PVC resin, 25 parts of wood powder, 25 parts of calcium carbonate, 25 parts of synergist, 2 parts of foaming agent, 7.5 parts of stabilizer, 1.5 parts of coupling agent, 8 parts of processing aid, 3 parts of lubricant and 2 parts of antibacterial agent;
the antibacterial agent is organosilicon quaternary ammonium salt;
the calcium carbonate is a mixture of heavy calcium carbonate, light calcium carbonate and composite calcium carbonate.
The stabilizer is a mixture of a calcium zinc stabilizer and an organic tin stabilizer.
The lubricant is a mixture of paraffin, PE wax, stearic acid and calcium stearate.
The preparation method of the wood-plastic composite material comprises the following steps: spraying the antibacterial agent on the surface of the wood powder; PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules; by means of spraying, the antibacterial agent can be uniformly contacted with the wood powder, so that the mixing of materials is improved in the mixing process, and the sterilization effect is further improved;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
Comparative example 2
The wood-plastic composite material comprises the following components in parts by weight: 100 parts of PVC resin, 25 parts of wood powder, 25 parts of calcium carbonate, 25 parts of synergist, 2 parts of foaming agent, 7.5 parts of stabilizer, 1.5 parts of coupling agent, 8 parts of processing aid, 3 parts of lubricant and 2 parts of antibacterial agent;
wherein the antimicrobial agent comprises: a housing: the shell component is organosilicon quaternary ammonium salt; a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride; a kernel. The inner core component is isothiazolinone; and, the particle diameter of the antimicrobial agent is: d50<5 μm, D90 < 12 μm. The weight portion ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2.
The calcium carbonate is a mixture of heavy calcium carbonate, light calcium carbonate and composite calcium carbonate.
The stabilizer is a mixture of a calcium zinc stabilizer and an organic tin stabilizer.
The lubricant is a mixture of paraffin, PE wax, stearic acid and calcium stearate.
The preparation method of the wood-plastic composite material comprises the following steps: mixing an antibacterial agent, wood powder, PVC resin, wood powder, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant to prepare intermediate granules; and (3) extruding and forming by a double-screw extruder.
Adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
Table 1: mechanical property index of products of each example
| Bending strength (MPa) | Tensile strength (MPa) | Impact Strength (MPa) | |
| Example 1 | 25.78 | 59.59 | 4.21 |
| Example 2 | 26.14 | 59.33 | 4.16 |
| Example 3 | 28.36 | 61.75 | 4.69 |
| Comparative example 1 | 19.01 | 60.32 | 4.17 |
| Comparative example 2 | 20.65 | 61.01 | 4.01 |
In the table, the mechanical properties are determined by adopting an universal mechanical experiment machine and referring to the national standard GB/T29418-2012 test standard for the physical and mechanical properties of the wood-plastic composite product.
Table 2: antibacterial index of the products of each example
The antibacterial performance test method comprises the following steps: the antibacterial performance of the wood-plastic composite material on the three bacteria is determined by taking escherichia coli (escherichia coli), staphylococcus aureus (staphylococcus aureus) and pseudomonas aeruginosa (pseudomonas aeruginosa) as test strains and referring to QB/T2591-2003 (antibacterial performance test method of antibacterial plastic) and LY/T1926-2010 (antibacterial performance test method and antibacterial effect test method of antibacterial wood (bamboo) texture plate) standards. The antibacterial performance of the wood-plastic composite material of each example and each comparative example is shown in table 2;
in conclusion, it can be known that the experimental results of the mechanical properties and the antibacterial properties of the product prepared in example 3 are better than those of other examples 1, and the experimental results of the mechanical properties and the antibacterial properties of examples 1 to 3 are generally better than those of comparative examples 1 and 2.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A wood-plastic composite, comprising: PVC resin, wood powder, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid, a lubricant and an antibacterial agent;
the antibacterial agent includes: a housing: the shell component is organosilicon quaternary ammonium salt; a middle layer, wherein the middle layer component is polyhexamethylene guanidine hydrochloride; a core, the core component being isothiazolinone; and, the particle diameter of the antimicrobial agent is: d50 is less than 5 μm, D90 is less than 12 μm; the weight part ratio of the organosilicon quaternary ammonium salt, the polyhexamethylene guanidine hydrochloride and the isothiazolinone is 5: 3: 2;
the preparation method of the wood-plastic composite material comprises the following steps:
spraying the antibacterial agent on the surface of the wood powder;
PVC resin, wood powder sprayed with an antibacterial agent, calcium carbonate, a synergist, a foaming agent, a stabilizer, a coupling agent, a processing aid and a lubricant are mixed to prepare intermediate granules;
extruding and molding through a double-screw extruder;
adding the medium granules into an extruder, heating to 130-190 ℃ and extruding; the temperature of a machine barrel of the extruder is 130-180 ℃, the temperature of a die is 130-200 ℃, the rotating speed of a main machine is 10-30 r/min, and the rotating speed of feeding is 10-25 r/min.
2. The wood-plastic composite according to claim 1, comprising in parts by weight: 80-120 parts of PVC resin, 15-35 parts of wood powder, 15-35 parts of calcium carbonate, 15-35 parts of a synergist, 1-3 parts of a foaming agent, 5-10 parts of a stabilizer, 1-2 parts of a coupling agent, 6-10 parts of a processing aid, 2-4 parts of a lubricant and 1-3 parts of an antibacterial agent.
3. The wood-plastic composite according to claim 1, comprising in parts by weight: 100 parts of PVC resin, 25 parts of wood powder, 25 parts of calcium carbonate, 25 parts of synergist, 2 parts of foaming agent, 7.5 parts of stabilizer, 1.5 parts of coupling agent, 8 parts of processing aid, 3 parts of lubricant and 2 parts of antibacterial agent.
4. The wood-plastic composite material according to claim 1, wherein the calcium carbonate is a mixture of one or more of ground calcium carbonate, light calcium carbonate and composite calcium carbonate.
5. The wood-plastic composite material according to claim 1, wherein the stabilizer is one or a mixture of two of a calcium zinc stabilizer and an organic tin stabilizer.
6. The wood-plastic composite material according to claim 1, wherein the lubricant is a mixture of one or more of paraffin wax, PE wax, stearic acid, calcium stearate.
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Denomination of invention: Antibacterial agents and wood plastic composites Effective date of registration: 20220519 Granted publication date: 20220201 Pledgee: China Co. truction Bank Corp Chizhou branch Pledgor: ANHUI KOJO NEW MATERIAL TECHNOLOGY Co.,Ltd. Registration number: Y2022980005842 |
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