CN112223577A - Mixing method for anti-static plastic granulation for injection molding - Google Patents
Mixing method for anti-static plastic granulation for injection molding Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
- B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
- B29B7/283—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control measuring data of the driving system, e.g. torque, speed, power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
- B29B7/286—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control measuring properties of the mixture, e.g. temperature, density
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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
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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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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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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
- 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
- B29C2945/76498—Pressure
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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
- 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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- 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
- 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
- B29C2945/76595—Velocity
- B29C2945/76605—Velocity rotational movement
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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
- 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
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
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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
- 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
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76665—Injection unit screw
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
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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
- C08K2201/001—Conductive additives
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- 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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention belongs to the technical field of plastic particle production, and particularly relates to a mixing method for anti-static plastic granulation for injection molding, which comprises the following steps: (1) cleaning the mixing barrel; (2) drying and dehydrating the granular resin; (3) weighing the dried and dehydrated granular resin, adding the granular resin into a mixing barrel, stirring and heating; (4) weighing a lubricant, a flow improver, an antioxidant and a coupling agent, adding into the mixing cylinder in the step (3), stirring and heating; (5) continuously weighing the flow improver, the lubricant, the dispersant and the conductive filler, adding into the mixing barrel in the step (4), stirring and discharging; (6) adding the uniformly mixed materials into a double-screw extruder, and extruding and granulating; (7) drying the particles prepared in the step (6); (8) and (4) feeding the particles dried in the step (7) into a single-screw injection molding machine for injection molding. The method ensures that the materials are mixed more uniformly, improves the antistatic performance of the product and reduces the influence of the conductive filler on the mechanical property of the plastic product.
Description
Technical Field
The invention belongs to the technical field of plastic particle production, and particularly relates to a mixing method for anti-static plastic granulation for injection molding.
Background
The plastic is also called resin, and is mainly divided into general plastic, engineering plastic, special plastic and the like according to the application, wherein the general plastic mainly comprises polyethylene, polypropylene, polystyrene, EVA, ABS and the like, the engineering plastic mainly comprises polyamide, polytetrafluoroethylene, polyformaldehyde, polycarbonate and the like, and the special plastic mainly refers to thermosetting plastic, such as phenolic plastic, amino plastic, epoxy plastic and the like; the material can be divided into granular material and powder material according to the shape.
In the production process of the antistatic plastic, material mixing is a crucial process, directly influences the antistatic performance, the mechanical property and the like of a product, and particularly, the layering phenomenon is easily generated when granular resin and powdery filler are mixed. The existing mixing method mainly comprises a one-step method and a multi-step method, wherein the one-step method is relatively simple and easy to operate, but is easy to disperse unevenly, layer and even agglomerate partial materials, so that the conductivity and mechanical property of a final product are influenced; the multi-step method is relatively complex, the charging sequence, the stirring speed, the mixing temperature, the mixing time and the like are mainly controlled, and the performance of the finally produced product is also uneven according to different control processes. In subsequent processing, a double-screw extruder with very strong plasticizing capacity basically replaces a single-screw extruder, the double-screw extruder can directly extrude mixed powder into a final product through the double-screw extruder, but the extrusion and material manufacturing link in single-screw extrusion is omitted in double-screw extrusion production, so that the quality of the mixed material greatly influences whether later-stage production can be normally carried out or not, whether the product quality is good or not, and strict requirements are provided for the batching quality. Therefore, how to scientifically mix the materials is the key to the quality of the product.
Disclosure of Invention
Aiming at the problem that the performance of a plastic product is not good enough due to the uneven mixing of granular resin and a powdery filler in the prior art, the invention provides a mixing method for the injection molding of antistatic plastic granulation, so that the materials are mixed more evenly, the antistatic performance of the product is improved, and the influence of a conductive filler on the mechanical performance of the plastic product is reduced.
The invention provides a mixing method for injection molding antistatic plastic granulation, which comprises the following steps:
(1) cleaning the mixing barrel;
(2) drying and dehydrating the granular resin;
(3) weighing the dried and dehydrated granular resin, adding the granular resin into a mixing barrel, stirring and heating;
(4) weighing a lubricant, a flow improver, an antioxidant and a coupling agent, adding into the mixing cylinder in the step (3), stirring and heating;
(5) continuously weighing the flow improver, the lubricant, the dispersant and the conductive filler, adding into the mixing barrel in the step (4), stirring and discharging;
(6) adding the uniformly mixed materials into a double-screw extruder, and extruding and granulating;
(7) drying the particles prepared in the step (6);
(8) and (4) feeding the particles dried in the step (7) into a single-screw injection molding machine for injection molding.
Further, the granular resin is a granular resin HDPE (high density polyethylene); the lubricant is PE wax or/and stearic acid; the flow improver is POE (polyolefin elastomer), and the POE is ethylene-propylene copolymer; the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester or Irganox 1010; the coupling agent is silicone powder; the dispersing agent is polyethylene glycol monomethyl ether or polyethylene glycol monobutyl ether; the conductive filler is one or more of conductive carbon black, graphene and carbon nano tubes.
Further, in the step (2), the moisture content of the dried and dehydrated granular resin is controlled to be less than or equal to 0.01 percent, the particle size is not more than 3.5mm, and the length is not more than 3 mm.
Further, in the step (3), 90-100 parts of the dried and dehydrated granular resin is weighed and added into a mixing barrel, the mixing barrel is started at a low rotating speed of 300-800 r/min, the mixture is stirred at a high rotating speed of 1200-2000 r/min, and the temperature is increased to 85-100 ℃.
Further, in the step (4), 0.5-2 parts of lubricant, 3-5 parts of flow improver, 0.2-0.5 part of antioxidant and 0.2-0.3 part of coupling agent are weighed and added into the mixing cylinder in the step (3), the mixing cylinder is started at a low rotating speed of 300-800 r/min, stirred at a high rotating speed of 1200-2000 r/min, and heated to 108-117 ℃.
Further, in the step (5), continuously weighing 1-3 parts of the flow improver, 0.5-1 part of the lubricant, 0.5-2 parts of the dispersant and 3-10 parts of the conductive filler, adding into the mixing barrel in the step (4), stirring at a low rotation speed of 300-800 r/min for 6-18 s, and discharging.
Further, in the step (6), the uniformly mixed materials are added into a parallel double-screw extruder with the length-diameter ratio of 40:1, and the temperature of the extrusion process of the double-screw extruder is as follows: 130 ℃ in the first area, 135 ℃ in the second area, 145 ℃ in the third area, 150 ℃ in the fourth area, 145 ℃ in the fifth area, 145 ℃ in the sixth area and 140 ℃ in the head; feeding speed is 20-80 r/min, extrusion speed is 180r/min, vacuum-pumping, melting, degassing, and extrusion granulation.
Further, in the step (7), the particles prepared in the step (6) are dried for 24 hours at the temperature of 80 ℃ and the vacuum degree of 0.06 MPa.
Further, in the step (8), the temperature of the injection molding process of the single-screw injection molding machine is as follows: the first area is 180 ℃, the second area is 190 ℃, and the third area is 190 ℃; the back pressure is 0.15 MPa; the screw rotation speed is 40 r/min.
In the process of mixing materials, the materials are stirred at a high speed, and are thrown to the inner wall of the mixing barrel and rise along the wall surface under the action of centrifugal force, and fall back to the center of the paddle under the action of gravity after rising to a certain height, and then are thrown up, so that the materials are mixed in a reciprocating cycle. Because the impeller has high rotating speed and the material has high moving speed, and the particles which move fast collide and rub with each other, the particles of the material generate stronger shearing action and higher heat, and the interaction promotes the even distribution and adsorption of all the components. Therefore, in the mixing process, factors such as how to improve the uniformity and the adsorption of each component, and reduce the phase separation degree of the mixed material are paid great attention. The control of the feeding sequence, the stirring speed, the mixing temperature and the mixing time in the mixing process is the main reason for influencing the factors, for example, in the mixing process, the aggregate is favorably disintegrated along with the prolonging of the time, the released aggregate is increased, and the conductivity is improved along with the increase of the released aggregate; however, if the kneading time is too long or the shear rate is too high, the molten polymer is broken and the conductivity is lowered.
The invention has the beneficial effects that:
according to the mixing method for the anti-static plastic granulation for injection molding, provided by the invention, the granular resin and the powdery filler are mixed more uniformly through the synergistic action among the feeding sequence, the stirring speed, the mixing temperature and the mixing time, the anti-static performance of the product is improved on the premise of controlling the conductive filler to the minimum, the influence of the conductive filler on the mechanical property of the plastic product is reduced, the production cost is reduced, and the market competitiveness is improved.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The mixing method for the injection molding antistatic plastic granulation comprises the following raw materials: 98 parts of granular resin HDPE, 1 part of PE wax, 0.5 part of stearic acid, 5 parts of POE, 0.3 part of Irganox 1010, 0.25 part of silicone powder, 1 part of polyethylene glycol monomethyl ether and 3.5 parts of carbon nano tube.
The method comprises the following steps:
(1) cleaning the mixing barrel, cleaning the inner wall of the mixing barrel by using a hairbrush, a copper brush and wiping cloth, and removing an ash layer, impurities and the like adhered to the inner wall;
(2) drying and dehydrating the granular resin HDPE, controlling the water content to be less than or equal to 0.01%, wherein the grain diameter of the granular resin HDPE is not more than 3.5mm, and the length of the granular resin HDPE is not more than 3 mm;
(3) 1960g of dried and dehydrated granular resin HDPE is weighed and added into a mixing barrel, the mixing barrel is started at a low rotating speed of 730r/min, the mixing barrel is rotated to a high rotating speed of 1450r/min for stirring, and the temperature is raised to 95 ℃;
(4) weighing 10g of PE wax, 10g of stearic acid, 60g of POE, 6g of Irganox 1010 and 5g of silicone powder, adding into the mixing cylinder in the step (3), starting at a low rotation speed of 730r/min, stirring at a high rotation speed of 1450r/min, and heating to 105 ℃;
(5) continuously weighing 40g of POE, 10g of PE wax, 20g of polyethylene glycol monomethyl ether and 70g of carbon nano tube, adding into the mixing barrel in the step (4), stirring for 15s at a low rotating speed of 730r/min, and discharging;
(6) adding the uniformly mixed materials into a parallel double-screw extruder with the length-diameter ratio of 40:1, wherein the temperature of the extrusion process of the double-screw extruder is as follows: 130 ℃ in the first area, 135 ℃ in the second area, 145 ℃ in the third area, 150 ℃ in the fourth area, 145 ℃ in the fifth area, 145 ℃ in the sixth area and 140 ℃ in the head; feeding at 22r/min and extruding at 180r/min, vacuum-pumping, melting, degassing, and extruding for granulation;
(7) drying the particles prepared in the step (6) for 24 hours at the vacuum degree of 0.06MPa and the temperature of 80 ℃;
(8) and (3) injecting the particles dried in the step (7) into a single-screw injection molding machine, wherein the injection molding process of the single-screw injection molding machine has the following temperature: the first area is 180 ℃, the second area is 190 ℃, and the third area is 190 ℃; the back pressure is 0.15 MPa; the screw rotation speed is 40 r/min.
The mixing method of the embodiment 2, the embodiment 3 and the embodiment 4 changes the temperature of the step (4) and the stirring time of the step (5) on the basis of the embodiment 1, and the other steps are the same, the invention also carries out the same conventional processing on the materials obtained in the four embodiments to prepare injection molding parts, and the surface resistance of the injection molding parts is detected, and the specific table is shown in table 1:
TABLE 1 compounding parameters of examples 1 to 4 and surface resistance of injection-molded parts thereof
As can be seen from the above table, the charging sequence of examples 1, 2, 3 and 4 is consistent, and the control temperature of step (4) is slightly lower in example 1 compared with example 2, but the conductivity of final example 2 is good, and the conductivity of example 1 is slightly worse; example 4 compared to example 2, the control temperature in step (4) was slightly higher, but the conductivity of the final example 4 was slightly worse; example 3 the stirring time in step (5) was longer than that in example 2, but the conductivity of the final example 3 was slightly worse. Therefore, the materials are mixed according to the mixing process strictly, and a product with better conductivity can be prepared.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A mixing method for anti-static plastic granulation for injection molding is characterized by comprising the following steps:
(1) cleaning the mixing barrel;
(2) drying and dehydrating the granular resin;
(3) weighing the dried and dehydrated granular resin, adding the granular resin into a mixing barrel, stirring and heating;
(4) weighing a lubricant, a flow improver, an antioxidant and a coupling agent, adding into the mixing cylinder in the step (3), stirring and heating;
(5) continuously weighing the flow improver, the lubricant, the dispersant and the conductive filler, adding into the mixing barrel in the step (4), stirring and discharging;
(6) adding the uniformly mixed materials into a double-screw extruder, and extruding and granulating;
(7) drying the particles prepared in the step (6);
(8) and (4) feeding the particles dried in the step (7) into a single-screw injection molding machine for injection molding.
2. The mixing method of antistatic plastic granules for injection molding according to claim 1, wherein the granular resin is granular resin HDPE; the lubricant is PE wax or/and stearic acid; the flow improver is POE, and the POE is ethylene-propylene copolymer; the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester or Irganox 1010; the coupling agent is silicone powder; the dispersing agent is polyethylene glycol monomethyl ether or polyethylene glycol monobutyl ether; the conductive filler is one or more of conductive carbon black, graphene and carbon nano tubes.
3. The mixing method of antistatic plastic granules for injection molding according to claim 1, wherein in the step (2), the moisture content of the dried and dehydrated granular resin is controlled to be less than or equal to 0.01%, the particle size is not greater than 3.5mm, and the length is not greater than 3 mm.
4. The mixing method of claim 1, wherein in the step (3), 90 to 100 parts of the dried and dehydrated granular resin is weighed and added into a mixing drum, the mixing drum is started at a low speed of 300 to 800r/min, the mixing drum is rotated at a high speed of 1200 to 2000r/min, and the temperature is raised to 85 to 100 ℃.
5. The mixing method of claim 1, wherein in the step (4), 0.5-2 parts of lubricant, 3-5 parts of flow improver, 0.2-0.5 part of antioxidant and 0.2-0.3 part of coupling agent are weighed and added into the mixing barrel in the step (3), the mixing barrel is started at a low speed of 300-800 r/min, the mixing barrel is stirred at a high speed of 1200-2000 r/min, and the temperature is increased to 108-117 ℃.
6. The mixing method of claim 1, wherein in the step (5), 1 to 3 parts of the flow improver, 0.5 to 1 part of the lubricant, 0.5 to 2 parts of the dispersant and 3 to 10 parts of the conductive filler are continuously weighed and added into the mixing barrel in the step (4), and the mixture is stirred at a low rotation speed of 300 to 800r/min for 6 to 18 seconds and discharged.
7. The mixing method of the antistatic plastic granulation for injection molding according to claim 1, wherein in the step (6), the uniformly mixed materials are added into a parallel twin-screw extruder with a length-diameter ratio of 40:1, and the temperature of the extrusion process of the twin-screw extruder is as follows: 130 ℃ in the first area, 135 ℃ in the second area, 145 ℃ in the third area, 150 ℃ in the fourth area, 145 ℃ in the fifth area, 145 ℃ in the sixth area and 140 ℃ in the head; feeding speed is 20-80 r/min, extrusion speed is 180r/min, vacuum-pumping, melting, degassing, and extrusion granulation.
8. The mixing method of antistatic plastic granules for injection molding according to claim 1, wherein in the step (7), the granules obtained in the step (6) are dried for 24 hours under a vacuum degree of 0.06MPa and at a temperature of 80 ℃.
9. The mixing method of antistatic plastic granules for injection molding according to claim 1, wherein in the step (8), the temperature of the injection process of the single-screw injection molding machine is as follows: the first area is 180 ℃, the second area is 190 ℃, and the third area is 190 ℃; the back pressure is 0.15 MPa; the screw rotation speed is 40 r/min.
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