CN111961306A - Plastic material part for infusion apparatus and injection molding process thereof - Google Patents

Plastic material part for infusion apparatus and injection molding process thereof Download PDF

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Publication number
CN111961306A
CN111961306A CN202010888280.XA CN202010888280A CN111961306A CN 111961306 A CN111961306 A CN 111961306A CN 202010888280 A CN202010888280 A CN 202010888280A CN 111961306 A CN111961306 A CN 111961306A
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China
Prior art keywords
injection molding
plastic material
ethylene
infusion set
antioxidant
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Chinese (zh)
Inventor
史万磊
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Suzhou Jingu Precision Plastic Co ltd
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Suzhou Jingu Precision Plastic Co ltd
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Priority to CN202010888280.XA priority Critical patent/CN111961306A/en
Publication of CN111961306A publication Critical patent/CN111961306A/en
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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
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • 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
    • 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
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • 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
    • 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
    • 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
    • B29C2945/76528—Frequency
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B29K2021/003—Thermoplastic elastomers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • 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
    • 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
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a plastic material part for an infusion apparatus and an injection molding process thereof, wherein the preparation raw materials comprise, by weight, 70-80 parts of a thermoplastic elastomer, 10-20 parts of a vinyl polymer, 1-5 parts of a lubricant, 1-2 parts of an antioxidant and 5-10 parts of a nano reinforcing agent; the infusion set dropping funnel is prepared by the raw material granulation and injection molding processes, has good strength and toughness, can reduce the generation and adsorption of bubbles, has good absorption on ultraviolet light, avoids the decomposition and denaturation of some medicines under illumination and the like, and improves the safety in the infusion process.

Description

Plastic material part for infusion apparatus and injection molding process thereof
Technical Field
The invention belongs to the field of medical materials, and particularly relates to a plastic material part for an infusion apparatus and an injection molding process thereof.
Background
The infusion apparatus is a commonly used medical consumable, the drip chamber of the infusion apparatus is a necessary structural component of the infusion apparatus, the drip chamber of the conventional infusion apparatus is made of PVC materials through injection molding, although the materials are low in price, the plasticizer DEHP is required to be added during processing of the drip chamber of the conventional PVC infusion apparatus to improve the plasticity of the materials, and monomer residues can exist, so that the materials have certain harm to a human body. In addition, air bubbles generated by liquid falling during transfusion are easily adsorbed on the dropping funnel of the conventional PVC transfusion device, so that the possibility of air entering a human body is increased, and the danger is increased. In addition, some drugs have certain special molecular structures, and can absorb ultraviolet light under illumination to generate reactions such as decomposition, oxidation and the like, so that the drug components are changed, the drug effect is reduced or lost, and even substances harmful to human bodies are generated.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a plastic material for an infusion set, wherein the plastic material comprises, by weight, 70 to 80 parts of a thermoplastic elastomer, 10 to 20 parts of a vinyl polymer, 1 to 5 parts of a lubricant, 1 to 2 parts of an antioxidant, and 5 to 10 parts of a nano-reinforcing agent.
As a preferable technical scheme, the thermoplastic elastomer is a mixture of an ethylene-octene block copolymer and a polypropylene copolymer, and the weight ratio of the ethylene-octene block copolymer to the polypropylene copolymer is (1.5-2.5): 1.
as a preferred technical scheme, the vinyl polymer is one or a mixture of a plurality of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-butyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-acrylic acid-carbonyl copolymer.
As a preferable technical scheme, the lubricant is one or a mixture of polyethylene wax, stearic acid and calcium stearate.
As a preferable technical scheme, the antioxidant is one or a mixture of two of antioxidant 168 and antioxidant 1010.
As a preferred technical scheme, the antioxidant is antioxidant 1010.
As a preferred technical scheme, the reinforcing agent is one or more of nano aluminum oxide, nano zirconium oxide, nano titanium dioxide and nano zinc oxide.
As a preferable technical scheme, the reinforcing agent is nano titanium dioxide.
As a preferable technical scheme, the average particle size of the nano titanium dioxide is less than 10 nm.
In order to solve the above problems, a second aspect of the present invention provides an injection molding process for a plastic material part for an infusion set, wherein the injection molding process comprises granulation and injection molding of raw materials.
Has the advantages that:
1. the thermoplastic elastomer is a safe and reliable material, and avoids the hazards caused by monomer residue and plasticizer addition during the processing of the drip chamber of the conventional PVC infusion set.
2. The vinyl polymer reduces the adsorption of air bubbles during transfusion and reduces the possibility of air entering human bodies. In addition, the fluidity of the material in the granulation and injection molding of the raw material is improved.
3. The antioxidant 1010 is a high-efficiency and low-color-pollution stabilizer, can be compatible with an ethylene-octene block copolymer, a copolymer polypropylene and a vinyl polymer, and effectively delays or inhibits the aging of the polymer. The ultraviolet curing agent also has good light stability and color change resistance, and reduces the influence of ultraviolet rays on the dropping funnel medicine of the infusion apparatus.
4. The nano reinforcing agent realizes the purpose of simultaneously reinforcing and toughening.
5. The nanometer titanium dioxide also can absorb ultraviolet rays and emit and scatter the ultraviolet rays, thereby avoiding the problems of color change, decomposition, precipitation and the like of the medicines caused by the ultraviolet rays.
Detailed Description
The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definition provided in the present disclosure, the definition of the term provided in the present disclosure controls.
As used herein, a feature that does not define a singular or plural form is also intended to include a plural form of the feature unless the context clearly indicates otherwise. It will be further understood that the term "prepared from …," as used herein, is synonymous with "comprising," including, "comprising," "having," "including," and/or "containing," when used in this specification means that the recited composition, step, method, article, or device is present, but does not preclude the presence or addition of one or more other compositions, steps, methods, articles, or devices. Furthermore, the use of "preferred," "preferably," "more preferred," etc., when describing embodiments of the present invention, is meant to refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. In addition, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
In order to solve the above problems, a first aspect of the present invention provides a plastic material for an infusion set, wherein the plastic material comprises, by weight, 70 to 80 parts of a thermoplastic elastomer, 10 to 20 parts of a vinyl polymer, 1 to 5 parts of a lubricant, 1 to 2 parts of an antioxidant, and 5 to 10 parts of a nano-reinforcing agent.
The thermoplastic elastomer is a safe and reliable material, avoids the hazards caused by residual monomers and added plasticizers during the processing of the drip chamber of the conventional PVC infusion set, and in some preferred embodiments, the thermoplastic elastomer is a mixture of an ethylene-octene block copolymer and a polypropylene copolymer, and the weight ratio of the ethylene-octene block copolymer to the polypropylene copolymer is (1.5-2.5): 1, has higher crystallization temperature, can be molded by injection more quickly, can also keep the elastic recovery and compression deformation of the material, and enhances the strength and impact resistance of the material.
In some preferred embodiments, the vinyl polymer is one or a mixture of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-butyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-acrylic acid-carbonyl copolymer, the surface tension value of the drip chamber of the thermoplastic elastomer infusion apparatus is increased, the tendency of bubbles to move to an infusion tube can be reduced after the surface tension is increased, the instability of the bubbles can be improved, the bubbles are eliminated, the adsorption of the bubbles during infusion is reduced, and the possibility of air entering a human body is reduced. In addition, the modified copolymer can be used for improving the lubricity of system components by cooperating with a lubricant, and is beneficial to improving the fluidity of materials in raw material granulation and injection molding.
In some preferred embodiments, the lubricant is one or a mixture of polyethylene wax, stearic acid and calcium stearate, which can improve the flowability of the material in raw material granulation and injection molding, thereby improving production efficiency and product quality. In addition, the addition of the lubricant can also reduce the adsorption of bubbles in the dropping funnel of the infusion apparatus and improve the safety of infusion.
In some preferred embodiments, the antioxidant is antioxidant 168, antioxidant 1010, or a mixture of two antioxidants, which is effective in retarding or inhibiting the aging of the polymer, and in some more preferred embodiments, the antioxidant is antioxidant 1010, and the antioxidant 1010 is a high-efficiency, low-color-pollution stabilizer compatible with ethylene-octene block copolymer, polypropylene copolymer, and vinyl polymer. The ultraviolet curing agent also has good light stability and color change resistance, and reduces the influence of ultraviolet rays on the dropping funnel medicine of the infusion apparatus.
In some preferred embodiments, the nano reinforcing phase is selected from one or a mixture of several of nano aluminum oxide, nano zirconium oxide, nano titanium dioxide and nano titanium dioxide, because the nano reinforcing phase has more active atoms on the particle surface and large surface energy, can be tightly combined with the ethylene-octene block copolymer, the polypropylene copolymer and the vinyl polymer, is not easy to separate from the base material when being subjected to external force, can better transmit the borne external stress, can initiate the yield of the base material, consumes a large amount of impact energy, and thus achieves the purpose of simultaneously reinforcing and toughening. In some more preferred embodiments, the nano reinforcing phase is selected from nano titanium dioxide, because the nano titanium dioxide also has the functions of absorbing ultraviolet rays and emitting and scattering ultraviolet rays, and the problems of color change, decomposition, precipitation and the like of the medicine caused by the ultraviolet rays are avoided. In addition, in the system, the titanium dioxide can also keep the stability of the ethylene-octene block copolymer, the polypropylene copolymer and the vinyl polymer and play a role in aging resistance. In some more preferred embodiments, the inventors have found that the use of titanium dioxide having an average particle size of less than 10nm provides the best absorption of ultraviolet light, and if the particle size is too large, the absorption of ultraviolet light is reduced, presumably because the smaller the particle size of the nano-sized titanium dioxide, the higher the surface energy and the stronger the absorption in the ultraviolet band.
The above starting materials in the present invention are all commercially available.
The second aspect of the invention provides an injection molding process of a plastic material part for an infusion apparatus, which is characterized in that the injection molding process comprises granulation and injection molding of raw materials;
the granulation process of the raw materials comprises the following steps:
1) mixing the thermoplastic elastomer, the vinyl polymer, the lubricant, the antioxidant and the nano reinforcing agent according to the formula, and then blowing and drying for 2 hours; (ii) a
2) Adding the raw materials prepared in the step 1) into a high-speed mixer for mixing at a rotating speed of 80-100r/min for 8-12 min, and discharging;
3) adding the raw materials prepared in the step 2) into a double-screw extruder, wherein the temperature of a first area of a charging barrel of the double-screw extruder is 80-90 ℃, the temperature of a second area of the charging barrel of the double-screw extruder is 100-120 ℃, the temperature of a third area of the charging barrel is 130-150 ℃, the temperature of a fourth area of the charging barrel is 170-190 ℃, and the temperature of a machine head is 150-160 ℃; melting, blending and granulating the raw materials to obtain a granulated raw material;
the injection molding process comprises the following steps:
1) preparing materials: putting the granulation raw material obtained by the granulation process into a heating cylinder of an injection molding machine;
2) setting parameters: inputting filling stage parameters of an injection molding process, position parameters of a screw rod when filling is completed and pressure maintaining parameters on an injection molding machine control panel;
the filling stage related parameters are:
in the first injection molding filling stage, the injection temperature is 170-180 ℃, the injection pressure is controlled to be 80-100 Bar, and the injection speed is controlled to be 10-15 mm/s, so that the injection molding material is gradually filled to a runner gate;
in the second injection molding filling stage, the injection temperature is 160-170 ℃, the injection pressure is controlled to be 50-70 Bar, and the injection speed is controlled to be 5-10 mm/s, so that the injection molding material is gradually filled to the periphery of the glue inlet;
in the third injection molding filling stage, the injection temperature is 190-200 ℃, the injection pressure is controlled to be 100-120 Bar, and the injection speed is controlled to be 30-40 mm/s, so that the injection molding material is gradually filled to the periphery of the sprue, and the overall shape of the product is basically filled;
in the fourth injection molding filling stage, the injection temperature is 180-190 ℃, the injection pressure is controlled to be 50-60 Bar, the injection speed is controlled to be 5-10 mm/s, glue is supplemented, the whole missing part of the product is supplemented, and the whole shape of the product is finished;
the position parameters of the screw when filling is completed are:
the injection molding switching position of the screw rod in the first injection molding filling stage is 60-65 mm; the injection molding switching position of the screw rod in the second injection molding filling stage is 45-50 mm; the injection molding switching position of the screw rod in the third injection molding filling stage is 20-25 mm; the injection molding switching position of the screw rod in the fourth injection molding filling stage is 15-20 mm;
the pressure maintaining parameters are as follows:
in the first pressure maintaining stage, the injection pressure is controlled to be 20-30 Bar, the injection speed is controlled to be 2-6 mm/s, the pressure maintaining time is 1.2s, and the folds near the glue inlet are completely fed;
and in the second pressure maintaining stage, the injection pressure is controlled at 30-40 Bar, the injection speed is controlled at 5-10 mm/s, the pressure maintaining time is 1.2s, and the position which is 1-2 mm away from the glue inlet and is easy to have the mark is completely fed.
3) Molding: closing a safety door of the injection molding machine, placing an opening and closing switch at an open position, starting the injection molding machine, and after injection molding is completed, taking out a workpiece by a manipulator for mold opening and placing the workpiece on a conveyor belt;
the product obtained under the injection molding process parameters has excellent integrity and density, no shrinkage cavity and surface defects, and the mechanical property and the surface quality of the product are further improved.
Examples
The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples.
Example 1
The embodiment 1 provides a plastic material part for an infusion apparatus and an injection molding process thereof, and the preparation raw materials comprise the following components in parts by weight: 75 parts of thermoplastic elastomer, 15 parts of vinyl polymer, 3 parts of lubricant, 1.5 parts of antioxidant and 8 parts of nano reinforcing agent.
The thermoplastic elastomer is a mixture of ethylene-octene block copolymer and polypropylene copolymer according to the weight ratio of 2:1, the vinyl polymer is ethylene-vinyl acetate copolymer, the lubricant is polyethylene wax, the antioxidant is antioxidant 1010, and the nano reinforcing agent is nano titanium dioxide.
The injection molding process comprises granulation and injection molding of raw materials;
the granulation process of the raw materials comprises the following steps:
1) weighing 50kg of ethylene-octene block copolymer (purchased from Taicangkaida plastic raw material Co., Ltd., trade name 9107), 25kg of copolymerized polypropylene (purchased from Longjia plastifying Co., Ltd., Dongguan), trade name bh3520), 15kg of ethylene-vinyl acetate copolymer (purchased from Yingcang plastifying Co., Ltd., trade name ES18002), 3kg of polyethylene wax (Ninghai Boer chemical Co., Ltd., trade name BR-2), 1.5kg of antioxidant 1010 (purchased from Hebei Kelong multi-biological science Co., Ltd., trade name kyhj-1), 8kg of nano titanium dioxide (Ningbo Mingnan new material science Co., Ltd., model MZT-A1, average particle size 3-5 nm);
2) adding the raw materials weighed in the step 1) into a high-speed mixer for mixing at a rotating speed of 90r/min for 10min, and discharging;
3) adding the raw materials prepared in the step 2) into a double-screw extruder, wherein the temperature of a first area of a charging barrel of the double-screw extruder is 85 ℃, the temperature of a second area of the charging barrel of the double-screw extruder is 110 ℃, the temperature of a third area of the charging barrel of the double-screw extruder is 140 ℃, the temperature of a fourth area of the charging barrel of the double-screw extruder is 180; melting, blending and granulating the raw materials to obtain a granulated raw material;
the injection molding process comprises the following steps:
1) preparing materials: putting the granulation raw material obtained by the granulation process into a heating cylinder of an injection molding machine;
2) setting parameters: inputting filling stage parameters of an injection molding process, position parameters of a screw rod when filling is completed and pressure maintaining parameters on an injection molding machine control panel;
the filling stage related parameters are:
in the first injection molding filling stage, the injection temperature is 175 ℃, the injection pressure is controlled at 90Bar, and the injection speed is controlled at 12mm/s, so that the injection molding material is gradually filled to the runner gate;
in the second injection molding filling stage, the injection temperature is 165 ℃, the injection pressure is controlled at 60Bar, and the injection speed is controlled at 8mm/s, so that the injection molding material is gradually filled to the periphery of the glue inlet;
in the third injection molding filling stage, the injection temperature is 195 ℃, the injection pressure is controlled at 110Bar, and the injection speed is controlled at 35mm/s, so that the injection molding material is gradually filled to the periphery of the sprue, and the whole shape of the product is basically filled;
in the fourth injection molding filling stage, the injection temperature is 185 ℃, the injection pressure is controlled at 55Bar, the injection speed is controlled at 8mm/s, the glue is supplemented, the whole missing part of the product is supplemented, and the whole shape of the product is finished;
the position parameters of the screw when filling is completed are:
the injection molding switching position of the screw in the first injection molding filling stage is 62 mm; the injection molding switching position of the screw rod in the second injection molding filling stage is 47 mm; the injection molding switching position of the screw rod in the third injection molding filling stage is 23 mm; the injection molding switching position of the screw rod in the fourth injection molding filling stage is 17 mm;
the pressure maintaining parameters are as follows:
in the first pressure maintaining stage, the injection pressure is controlled at 25Bar, the injection speed is controlled at 4mm/s, the pressure maintaining time is 1.2s, and the wrinkles near the glue inlet are completely fed;
in the second pressure maintaining stage, the injection pressure is controlled at 35Bar, the injection speed is controlled at 8mm/s, the pressure maintaining time is 1.2s, and the position which is 1 mm-2 mm away from the glue inlet and is easy to have the mark is completely fed;
3) molding: and closing a safety door of the injection molding machine, placing an opening and closing switch at an opened position, starting the injection molding machine, and after the injection molding is finished, taking out a workpiece by a manipulator for mold opening and placing the workpiece on a conveyor belt.
Example 2
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 50kg of ethylene-octene block copolymer, 25kg of polypropylene copolymer, 10kg of ethylene-vinyl acetate copolymer, 1kg of polyethylene wax, 1kg of antioxidant 1010 and 5kg of nano titanium dioxide.
Example 3
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 50kg of ethylene-octene block copolymer, 25kg of polypropylene copolymer, 20kg of ethylene-vinyl acetate copolymer, 5kg of polyethylene wax, 2kg of antioxidant 1010 and 10kg of nano titanium dioxide.
Comparative example 1
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 60kg of ethylene-octene block copolymer, 30kg of polypropylene copolymer, 15kg of ethylene-vinyl acetate copolymer, 3kg of polyethylene wax, 1.5kg of antioxidant 1010 and 8kg of nano titanium dioxide.
Comparative example 2
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 40kg of ethylene-octene block copolymer, 20kg of polypropylene copolymer, 15kg of ethylene-vinyl acetate copolymer, 3kg of polyethylene wax, 1.5kg of antioxidant 1010 and 8kg of nano titanium dioxide.
Comparative example 3
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 37.5kg of ethylene-octene block copolymer, 37.5kg of copolymerized polypropylene, 15kg of ethylene-vinyl acetate copolymer, 3kg of polyethylene wax, 1.5kg of antioxidant 1010 and 8kg of nano titanium dioxide.
Comparative example 4
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 50kg of ethylene-octene block copolymer, 25kg of polypropylene copolymer, 15kg of ethylene-vinyl acetate copolymer, 3kg of polyethylene wax, 1.5kg of antioxidant 1010 and 0kg of nano titanium dioxide.
Comparative example 5
A plastic material piece for an infusion set and an injection molding process thereof are provided similarly to example 1, but the preparation raw materials are as follows: 50kg of ethylene-octene block copolymer, 25kg of polypropylene copolymer, 15kg of ethylene-vinyl acetate copolymer, 3kg of polyethylene wax, 1.5kg of antioxidant 1010 and 8kg of nano titanium dioxide (obtained from Shanghai Chaowei nanotechnology Co., Ltd., model number CW-TiO)2001, average particle size 20 nm).
Evaluation of Performance
1. And (3) testing tensile property: the tensile properties of the samples were measured according to the GB/T1040.1-2018 determination of tensile Properties of plastics, and the results are shown in Table 1.
2. And (3) testing the bending property: the bending properties of the samples were tested according to the GB/T9341-2008 & ltdetermination of Plastic bending Properties & gt standard, and the results are shown in Table 1.
3. And (3) testing the fused index: the melt index of the sample was measured according to GB/T3682-2000 "determination of melt mass flow rate and melt volume flow rate of thermoplastics" standard, and the results are shown in Table 1.
4. And (3) testing light transmittance: the light transmittance of the sample is tested according to the standard of GB 18458.3-2005 'Special infusion set part 3: disposable light-proof infusion set', and the result is shown in Table 1.
TABLE 1
Figure BDA0002656202320000081
The embodiments 1 to 3 and the comparative examples 1 to 5 show that the plastic material piece for the infusion apparatus and the injection molding process thereof have good strength and toughness, can reduce the generation and adsorption of bubbles, have good light shading performance, and reduce the influence of ultraviolet light on medicines.
Finally, it should be understood that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and 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 plastic material piece for an infusion set is characterized in that: the preparation raw materials comprise, by weight, 70-80 parts of thermoplastic elastomer, 10-20 parts of vinyl polymer, 1-5 parts of lubricant, 1-2 parts of antioxidant and 5-10 parts of nano reinforcing agent.
2. The plastic material for infusion set as claimed in claim 1, wherein: the thermoplastic elastomer is a mixture of an ethylene-octene block copolymer and a polypropylene copolymer, and the weight ratio of the ethylene-octene block copolymer to the polypropylene copolymer is (1.5-2.5): 1.
3. the plastic material for infusion set as claimed in claim 1, wherein: the vinyl polymer is one or a mixture of more of ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-butyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-acrylic acid-carbonyl copolymer.
4. The plastic material for infusion set as claimed in claim 1, wherein: the lubricant is one or a mixture of polyethylene wax, stearic acid and calcium stearate.
5. The plastic material for infusion set as claimed in claim 1, wherein: the antioxidant is one or a mixture of antioxidant 168 and antioxidant 1010.
6. The plastic material for infusion set as claimed in claim 5, wherein: the antioxidant is antioxidant 1010.
7. The plastic material for infusion set as claimed in claim 1, wherein: the nano reinforcing agent is one or more of nano aluminum oxide, nano zirconium oxide, nano titanium dioxide and nano zinc oxide.
8. The plastic material for infusion set as claimed in claim 7, wherein: the nano reinforcing agent is nano titanium dioxide.
9. The plastic material for infusion set as claimed in claim 8, wherein: the average grain diameter of the nano titanium dioxide is less than 10 nm.
10. An injection molding process of a plastic material part for an infusion set according to any one of claims 1 to 9, wherein the injection molding process comprises granulation and injection molding of raw materials.
CN202010888280.XA 2020-08-28 2020-08-28 Plastic material part for infusion apparatus and injection molding process thereof Pending CN111961306A (en)

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CN101792558A (en) * 2010-02-23 2010-08-04 广州市合诚化学有限公司 Inner cap material for transfusion packages, and preparation method and applications thereof
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Application publication date: 20201120