CN113352539A - Light PP toothbrush handle micro-foaming injection molding process - Google Patents
Light PP toothbrush handle micro-foaming injection molding process Download PDFInfo
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- CN113352539A CN113352539A CN202110731495.5A CN202110731495A CN113352539A CN 113352539 A CN113352539 A CN 113352539A CN 202110731495 A CN202110731495 A CN 202110731495A CN 113352539 A CN113352539 A CN 113352539A
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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
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
- B29C45/1816—Feeding auxiliary material, e.g. colouring material
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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
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
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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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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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
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
- B29C45/1866—Feeding multiple materials
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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
- B29C45/26—Moulds
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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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
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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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides a light PP toothbrush handle micro-foaming injection molding process, which belongs to the technical field of foaming injection molding and comprises the following steps: s1, sampling according to parts by weight, putting polymer granules, colloidal particle pigment, biological glue solution and processing aid into a stirrer, stirring at the speed of 150r/min at the temperature of 20-35 ℃ for 10-20min, and fully mixing and stirring for later use; s2, screening the mixture obtained in the step S1 by a screen machine with 250 meshes. According to the invention, starch and plant fiber are added into the plastic material, so that the adhesiveness and fiber strength of the formed polymer solution are ensured in the melting process, the forming effect of the polymer solution is better, the toughness of the polymer solution can be ensured in the foaming process, and the generated bubbles can be denser.
Description
Technical Field
The invention belongs to the technical field of foaming injection molding, and particularly relates to a light PP toothbrush handle micro-foaming injection molding process.
Background
In the foaming process or the foaming polymer material, a honeycomb or cellular structure is formed through the addition and reaction of a physical foaming agent or a chemical foaming agent. The basic steps of foam molding are the formation of a bubble nucleus, the growth or enlargement of the bubble nucleus, and the stabilization of the bubble nucleus. At a given temperature and pressure, the solubility of the gas decreases so that saturation is reached, allowing excess gas to escape and form bubbles, thereby effecting nucleation.
At present, the foaming injection molding process commonly used in the market is mainly focused on foaming molding, and the aspects of environmental protection degradation, molded plastic body reinforcement and quality guarantee and the like are less involved in the combination and selection of molding materials, so that the process capable of effectively improving the quality of the molded plastic body in various aspects is researched and put into use.
Disclosure of Invention
The invention aims to provide a light PP toothbrush handle micro-foaming injection molding process, and aims to solve the problems that in the prior art, the environment-friendly degradation performance is low in the production and use processes, and various advantages cannot be realized in the quality of a molded plastic body.
In order to achieve the purpose, the invention provides the following technical scheme:
a light PP toothbrush handle micro-foaming injection molding process comprises the following steps:
s1: sampling according to the parts by weight, putting the polymer granules, the colloidal particle pigment, the biological glue solution and the processing aid into a stirrer, stirring at the speed of 150r/min at the temperature of 20-35 ℃ for 10-20min, mixing, and fully mixing and stirring to obtain a mixture for later use;
s2: sieving the mixture obtained in the step S1 through a sieve of 250 meshes;
s3: adding the mixture and the foaming agent in the step S2 into a barrel of an injection molding machine in batches according to the capacity of the barrel, then melting the mixture in the step S2 into a polymer melt by using heat generated by a heating heater in the injection molding machine, and mixing the mixture and the foaming agent in the injection molding machine to generate a polymer and a gas;
s4: the polymer and the gas formed in the step S3 enter a diffusion chamber through a static mixer for molecular diffusion homogenization, the gas solubility is reduced by heat, and a polymer melt containing a large number of micro-bubble nuclei is formed in the diffusion chamber;
s5: and pushing the polymer solution to be injected into the mold cavity through the control valve, waiting for 5-10min for cooling and molding the mold, and extruding the molded toothbrush handle.
As a preferable scheme of the invention, the polymer granules comprise the following raw materials in parts by weight: 5 parts of pp polypropylene particles, 1 part of starch, 1 part of plant fiber, 1-3 parts of white oil and 1-2 parts of sulfonated polyimide-siloxane copolymer.
In a preferred embodiment of the present invention, the colloidal particle pigment is prepared by mixing one or more of yellow, green, cyan, blue and violet.
As a preferable scheme of the invention, the biological glue solution is prepared by mixing gum and bone glue according to a ratio of 1: 1.
In a preferred embodiment of the invention, the foaming agent adopts N2 gas with high nucleation degree and low solubility, and is mixed and injected with CO2 gas with a controllable weight ratio of 1:1, and the injection rate is controlled by a metering valve.
As a preferable scheme of the invention, the rapid heating heater needs to set the temperature rise change rate at 5 ℃/s, and the temperature of the rapid heating device is constantly controlled between 150 ℃ and 200 ℃.
As a preferable proposal of the invention, a constant high pressure state between 80 and 100MPa is required to be maintained in the diffusion chamber.
In a preferred embodiment of the invention, the control valve is arranged between the injection molding machine and the mold and is closed both before the injection of the polymer melt into the mold and after the mold is filled.
As a preferred scheme of the invention, the outer surface of the die is sleeved with a temperature controller, so that the temperature of the die is controlled to be rapidly reduced and cooled.
In a preferred embodiment of the present invention, in the step S3, 1 to 3 parts of glass fiber is added to the mold during injection molding, and then the mixture is cooled and molded.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, starch and plant fiber are mixed and added in the polymer granules besides the basic pp polypropylene particles, so that the adhesiveness and the fiber strength of the formed polymer solution can be ensured in the melting process, the forming effect of the polymer solution is better, the toughness of the polymer solution can be ensured in the foaming process, and the generated bubbles can be denser.
2. According to the invention, the colloidal particle pigment is added in the initial mixing and stirring process, so that the formed plastic body can be fully melted and dyed before foaming, the uniform mixing of the pigment is realized, the pigment can be fully mixed in the hot melting process, and the pigment is selected to be colloidal particles, so that the uniform mixing property of stirring can be ensured, and the color of the formed plastic body is more natural.
3. According to the invention, the glass fiber is added in the final die forming process, so that the toughness of the formed plastic body can be improved before final forming, the strength is improved, and the addition at this time can not influence the early melting process, so that the smoothness of the foaming process is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a light PP toothbrush handle micro-foaming injection molding process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Examples
Referring to fig. 1, the present invention provides the following technical solutions:
a light PP toothbrush handle micro-foaming injection molding process comprises the following steps:
s1: sampling according to the parts by weight, putting the polymer granules, the colloidal particle pigment, the biological glue solution and the processing aid into a stirrer, stirring at the speed of 150r/min at the temperature of 20-35 ℃ for 10-20min, mixing, and fully mixing and stirring to obtain a mixture for later use;
s2: sieving the mixture obtained in the step S1 through a sieve of 250 meshes;
s3: adding the mixture and the foaming agent in the step S2 into a barrel of an injection molding machine in batches according to the capacity of the barrel, then melting the mixture in the step S2 into a polymer melt by using heat generated by a heating heater in the injection molding machine, and mixing the mixture and the foaming agent in the injection molding machine to generate a polymer and a gas;
s4: the polymer and the gas formed in the step S3 enter a diffusion chamber through a static mixer for molecular diffusion homogenization, the gas solubility is reduced by heat, and a polymer melt containing a large number of micro-bubble nuclei is formed in the diffusion chamber;
s5: and pushing the polymer solution to be injected into the mold cavity through the control valve, waiting for 5-10min for cooling and molding the mold, and extruding the molded toothbrush handle.
In this embodiment: firstly, sampling according to parts by weight, taking polymer granules, colloidal particle pigment, biological glue solution and processing aid, feeding the polymer granules, the colloidal particle pigment, the biological glue solution and the processing aid into a stirrer, setting the environmental temperature at 20-35 ℃, starting a plate shearing machine to stir at the rotating speed of 150r/min for 10-20min so that the materials can be fully mixed, then sieving the mixture by a sieving machine with 250 meshes to ensure the purity of the mixture and screen out unnecessary substances, then adding the mixture and a foaming agent into a cylinder of an injection molding machine in batches according to the capacity of the cylinder, melting the mixture into polymer melt by utilizing the heat generated by a heating heater in the injection molding machine, mixing the mixture and the foaming agent in the injection molding machine to generate polymer and gas, feeding the polymer and the gas into a diffusion chamber for molecular diffusion and homogenization, wherein the heat in the diffusion chamber reduces the gas solubility, and the polymer melt forms a polymer melt containing a large number of micro-bubble nuclei, and finally, pushing the polymer solution to be injected into a mold cavity through a control valve, waiting for 5-10min for mold cooling and molding, and extruding the molded toothbrush handle.
Specifically, referring to fig. 1, the polymer pellets are prepared by mixing the following raw materials in parts by weight: 5 parts of pp polypropylene particles, 1 part of starch, 1 part of plant fiber, 1-3 parts of white oil and 1-2 parts of sulfonated polyimide-siloxane copolymer.
In this embodiment: the addition of starch and plant fiber ensures the adhesiveness and fiber strength of the formed polymer solution in the melting process, the forming effect of the polymer solution is better, and the materials such as white oil and the like added simultaneously can improve the injection smooth sliding of the whole preparation process while improving the performance of the polymer.
Referring specifically to fig. 1, the colloidal particle pigment is made by mixing one or more of yellow, green, cyan, blue and violet colloidal particle pigments.
In this embodiment: the addition of the colloidal particle pigment can ensure that the molded plastic body is fully melted and dyed before foaming, realize uniform mixing of the pigment, improve the smoothness of the pigment fused in and improve the aesthetic property of the surface of the molded plastic body.
Specifically, referring to fig. 1, the biogum solution is prepared by mixing gum and bone glue in a ratio of 1: 1.
In this embodiment: the addition of the biological glue solution can improve the toughness of the molded plastic body in the foaming process and ensure the foaming quality.
Specifically, referring to fig. 1, the blowing agent is prepared by mixing and injecting N2 gas with high nucleation degree and low solubility and CO2 gas with a controllable weight ratio of 1:1, and controlling the injection rate through a metering valve.
In this embodiment: the low solubility of N2 and CO2 gas can ensure that the foaming process can be foamed smoothly, and the difficulty in foaming or the non-uniformity in foaming caused by mixing the gas and the polymer solution can be avoided.
Specifically, referring to fig. 1, the rapid temperature rise heater needs to set the temperature rise change rate at 5 ℃/s, and the temperature of the rapid temperature rise heater is constantly controlled to be between 150 ℃ and 200 ℃.
In this embodiment: the rapid heating heater can rapidly melt the mixture to form a polymer solution in the machine barrel and the diffusion chamber through heat, and can enhance molecular motion in the diffusion chamber, improve the mixing property of solid and gas, and ensure the foaming quality.
Specifically, referring to FIG. 1, a constant high pressure of 80-100MPa is required to be maintained in the diffusion chamber.
In this embodiment: the high-pressure environment in the diffusion chamber can effectively inhibit the expansion of the formed bubble nucleus and ensure the stability of the foamed bubbles.
Referring specifically to fig. 1, the control valve is mounted between the injection molding machine and the mold and remains closed both before the mold is filled with polymer melt and after the mold is filled.
In this embodiment: the control valve can control a channel between the injection molding device and the mold, and the relative independence of the foaming process and the molding process is ensured.
Specifically, referring to fig. 1, a temperature controller is installed on the outer surface of the mold to control the temperature of the mold to be rapidly reduced and cooled.
In this embodiment: the temperature controller is arranged on the outer surface of the mold, the temperature of the surface of the mold can be conveniently regulated and controlled, the forming process is accelerated through temperature control in the forming process, the efficiency is improved, it needs to be explained that the temperature controller belongs to the prior art, installation and setting are carried out by related technical personnel, and details are not repeated in the scheme.
Specifically, referring to fig. 1, in step S3, 1-3 parts of glass fiber is added into the mold for cooling and molding.
In this embodiment: the glass fiber is added in the final die forming process, so that the toughness of the formed plastic body can be improved before final forming, and the toughness and the strength of the formed plastic body are improved.
According to the process steps of the examples, controlling the mixing of various ingredients in the preparation of the mixture in the previous stage can have an effect on the toughness and the color-dissolving effect of the molded body, and thus the effect realization range is verified by ingredient control:
table one: polymer pellet ingredient test chart
| PP polypropylene granules | Starch | Plant fiber | Other materials | Toughness of plastic body | |
| Control group | 5 | 1 | 1 | 4 | Is preferably used |
| Group A | 5 | 0.5 | 0.5 | 4 | Is poor |
| Group B | 5 | 1.5 | 1.5 | 4 | Is preferably used |
| Group C | 5 | 2 | 2 | 4 | Is poor |
Table one: ingredient test chart of mixture
| Polymer pellets | Colloidal particle pigment | Biological glue solution | Processing aid | Plastic color dissolving effect | |
| Control group | 6 | 2 | 2 | 1 | Is preferably used |
| Group A | 6 | 0.5 | 1.5 | 1 | Is poor |
| Group B | 6 | 1 | 1 | 1 | Is preferably used |
| Group C | 6 | 1.5 | 0.5 | 1 | Is poor |
As shown in Table I:
the starch and the cellulose in the components of the polymer granules have influence on the toughness of the molded plastic body, the ratio of the starch to the cellulose is controlled to be between 1 and 2, the effect is best, the quality of the molded plastic body can be enhanced to the maximum extent, and the influence on the formation of the plastic body is avoided;
as shown in table two:
the colloidal particle pigment in the components of the mixture can be uniformly dyed in a foaming process through hot melting, so that the color dissolving effect of a molded plastic body is enhanced, the attractiveness is improved, but experiments show that the proportion of the colloidal particle pigment to the components of the biological glue solution is controlled to be equal, and the proportion of the colloidal particle pigment to the components of the biological glue solution is controlled to be about 20% in the total mixture.
The working principle and the using process of the invention are as follows: firstly, sampling according to parts by weight, taking polymer granules, colloidal particle pigment, biological glue solution and processing aid, feeding the polymer granules, the colloidal particle pigment, the biological glue solution and the processing aid into a stirrer, setting the environmental temperature at 20-35 ℃, starting a plate shearing machine to stir at the rotating speed of 150r/min for 10-20min so that the materials can be fully mixed, then sieving the mixture by a sieving machine with 250 meshes to ensure the purity of the mixture and screen out unnecessary substances, then adding the mixture and a foaming agent into a cylinder of an injection molding machine in batches according to the capacity of the cylinder, melting the mixture into polymer melt by utilizing the heat generated by a heating heater in the injection molding machine, mixing the mixture and the foaming agent in the injection molding machine to generate polymer and gas, feeding the polymer and the gas into a diffusion chamber for molecular diffusion and homogenization, wherein the heat in the diffusion chamber reduces the gas solubility, and the polymer melt forms a polymer melt containing a large number of micro-bubble nuclei, and finally, pushing the polymer solution to be injected into a mold cavity through a control valve, waiting for 5-10min for mold cooling and molding, and extruding the molded toothbrush handle.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A light PP toothbrush handle micro-foaming injection molding process is characterized by comprising the following steps:
s1: sampling according to the parts by weight, putting the polymer granules, the colloidal particle pigment, the biological glue solution and the processing aid into a stirrer, stirring at the speed of 150r/min at the temperature of 20-35 ℃ for 10-20min, mixing, and fully mixing and stirring to obtain a mixture for later use;
s2: sieving the mixture obtained in the step S1 through a sieve of 250 meshes;
s3: adding the mixture and the foaming agent in the step S2 into a barrel of an injection molding machine in batches according to the capacity of the barrel, then melting the mixture in the step S2 into a polymer melt by using heat generated by a heating heater in the injection molding machine, and mixing the mixture and the foaming agent in the injection molding machine to generate a polymer and a gas;
s4: the polymer and the gas formed in the step S3 enter a diffusion chamber through a static mixer for molecular diffusion homogenization, the gas solubility is reduced by heat, and a polymer melt containing a large number of micro-bubble nuclei is formed in the diffusion chamber;
s5: and pushing the polymer solution to be injected into the mold cavity through the control valve, waiting for 5-10min for cooling and molding the mold, and extruding the molded toothbrush handle.
2. The microfoaming injection molding process of the lightweight PP toothbrush handle as claimed in claim 1, wherein: the polymer granules comprise the following raw materials in parts by weight: 5 parts of pp polypropylene particles, 1 part of starch, 1 part of plant fiber, 1-3 parts of white oil and 1-2 parts of sulfonated polyimide-siloxane copolymer.
3. The light PP toothbrush handle micro-foaming injection molding process of claim 2, wherein: the colloidal particle pigment is prepared by mixing one or more of yellow, green, cyan, blue and purple.
4. The light PP toothbrush handle micro-foaming injection molding process of claim 3, wherein: the biological glue solution is prepared by mixing gum and bone glue according to the proportion of 1: 1.
5. The light PP toothbrush handle micro-foaming injection molding process of claim 4, wherein: the foaming agent adopts N2 gas with high nucleation degree and low solubility, and is mixed and injected with CO2 gas with controllable weight in a ratio of 1:1, and the injection rate is controlled by a metering valve.
6. The microfoaming injection molding process of the lightweight PP toothbrush handle as claimed in claim 5, wherein: the rapid heating heater needs to set the temperature rise change rate at 5 ℃/s, and the temperature of the rapid heating device is constantly controlled between 150 ℃ and 200 ℃.
7. The microfoaming injection molding process of the lightweight PP toothbrush handle as claimed in claim 6, wherein: the diffusion chamber is required to maintain a constant high pressure state between 80 and 100 MPa.
8. The microfoaming injection molding process of the lightweight PP toothbrush handle as claimed in claim 7, wherein: the control valve is mounted between the injection molding machine and the mold and remains closed both before the mold is filled with polymer melt and after the mold is filled.
9. The microfoaming injection molding process of the lightweight PP toothbrush handle as claimed in claim 8, wherein: the outer surface cover of mould is established the installation thermostat, and control mould temperature reduces the cooling fast.
10. The microfoaming injection molding process of the lightweight PP toothbrush handle as claimed in claim 9, wherein: and (S3) adding 1-3 parts of glass fiber into the mold during injection molding, and then cooling and molding.
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Cited By (1)
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| CN114559624A (en) * | 2022-03-24 | 2022-05-31 | 深圳市精博德科技有限公司 | Efficient preparation method of sound transparent plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114559624A (en) * | 2022-03-24 | 2022-05-31 | 深圳市精博德科技有限公司 | Efficient preparation method of sound transparent plate |
| CN114559624B (en) * | 2022-03-24 | 2024-03-22 | 深圳市精博德科技有限公司 | Efficient preparation method of sound transmission plate |
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Application publication date: 20210907 |