CN111070607A - Microcellular foaming injection molding process for plastic cover plate - Google Patents

Microcellular foaming injection molding process for plastic cover plate Download PDF

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Publication number
CN111070607A
CN111070607A CN201911376766.9A CN201911376766A CN111070607A CN 111070607 A CN111070607 A CN 111070607A CN 201911376766 A CN201911376766 A CN 201911376766A CN 111070607 A CN111070607 A CN 111070607A
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Prior art keywords
injection molding
molding process
injection
parts
polymer
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张雪明
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Suzhou Nicety Plastic Co ltd
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Suzhou Nicety Plastic Co ltd
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Priority to CN201911376766.9A priority Critical patent/CN111070607A/en
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0014—Use of organic additives
    • C08J9/0023—Use of organic additives containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • 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
    • B29C2945/76531—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
    • B29C2945/76545—Flow rate
    • 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
    • B29C2945/76551—Time
    • B29C2945/76561—Time duration
    • 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
    • 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
    • B29C2945/76732—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
    • 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
    • B29C2945/76765—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
    • 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
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76829—Feeding
    • 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
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76859—Injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3406—Components, e.g. resistors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
    • C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2445/00—Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers
    • C08J2445/02—Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers of coumarone-indene polymers
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2455/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2423/00 - C08J2453/00
    • C08J2455/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2469/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Medicine (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention discloses a light and high-strength steelThe microcellular foaming injection molding process of the plastic cover plate with the strength comprises the following steps: (1) preparing and fully drying the following raw materials: fully and uniformly mixing a PC/ABS alloy, coumarone-indene resin, a tetrafluoroethylene-perfluoroalkyl vinyl ether polymer, acetylated tributyl citrate and a modified additive to obtain a uniformly mixed material; (2) feeding the uniformly mixed material obtained in the step (1) into a cylinder of an injection molding machine through a charging barrel, melting and uniformly mixing the uniformly mixed material through heating and stirring of a screw, and then using a supercritical fluid control device to control a certain amount of N2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw; (3) and (3) rapidly heating to enable the homogeneous system in the step (2) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.

Description

Microcellular foaming injection molding process for plastic cover plate
Technical Field
The invention relates to the technical field of preparation of plastic products, in particular to a microcellular foaming injection molding process of a plastic cover plate.
Background
The plastic cover plate is a novel light cover plate material which is very popular in the world at present, the plastic cover plate has the advantages of better water resistance, corrosion resistance, high strength and the like compared with a wooden cover plate, and has the advantages of light weight, low price, easiness in manufacturing and the like compared with a metal cover plate, so that the plastic cover plate is widely accepted in domestic application after entering the Chinese market, and can be widely applied to various industries as a drainage ditch plastic cover plate, a tray plastic cover plate, an electronic product plastic cover plate, a household appliance plastic cover plate and the like. At present, the cover plate made of plastic still has the defects of high density, high preparation cost, low mechanical strength of low-density plastic cover plate products and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a microcellular foaming injection molding process of a light-weight and high-strength plastic cover plate.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a microcellular foaming injection molding process of a plastic cover plate comprises the following steps:
(1) preparing and fully drying the following raw materials: PC/ABS alloy, coumarone-indene resin, tetrafluoroethylene-perfluoroalkyl vinyl ether polymer, acetylated tributyl citrate and modified additive;
(2) fully and uniformly mixing the raw materials to obtain a uniformly mixed material;
(3) feeding the uniformly mixed material obtained in the step (2) into a cylinder of an injection molding machine through a charging barrel, melting and uniformly mixing the uniformly mixed material through heating and stirring of a screw, and then using a supercritical fluid control device to control a certain amount of N2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(4) and (3) rapidly heating to enable the homogeneous system in the step (3) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
Further, the raw materials in the step (1) comprise the following components in parts by weight: 60-100 parts of PC/ABS alloy, 5-30 parts of coumarone-indene resin, 10-50 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether polymer, 3-12 parts of acetylated tributyl citrate and 1-30 parts of modified additive.
Furthermore, the copolymerization amount of the perfluoroalkyl vinyl ether in the tetrafluoroethylene-perfluoroalkyl vinyl ether polymer is not more than 4%, so that the tetrafluoroethylene-perfluoroalkyl vinyl ether polymer has higher mechanical property, and the excellent performance of polytetrafluoroethylene is kept, and meanwhile, the good melt processability is kept.
Further, the modified additive is modified nano brucite fiber.
Further, the preparation method of the modified nano brucite fiber comprises the following steps: taking nano brucite fiber powder, performing ultrasonic treatment in a deionized water bath, then precipitating, centrifuging, taking a solid, fully drying at 100 ℃, using acetic acid as a catalyst, using trifluoropropyltrimethoxysilane as a modifier for surface modification, and performing treatment at 80 ℃ for 2 hours.
Further, the injection molding process of the injection molding machine in the step (3) and the step (4) comprises the following steps: the pre-molding amount is 20-23mm, the injection melt temperature is 265-275 ℃, the injection speed is 75-85mm/s, the gas injection time is 6-8s, the injection pressure is 10-12MPa, and the mold temperature is 60-80 ℃.
Preferably, the injection molding process of the injection molding machine in the step (3) and the step (4) is as follows: the preplasticizing quantity is 22mm, the temperature of the injection melt is 270 ℃, the injection speed is 80mm/s, the gas injection time is 7s, the injection pressure is 11MPa, and the mold temperature is 65 ℃.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, coumarone-indene resin, tetrafluoroethylene-perfluoroalkyl vinyl ether polymer, acetylated tributyl citrate and a modified additive are uniformly mixed with the PC/ABS alloy for injection molding, so that compared with the PC/ABS alloy, the obtained foamed plastic can save raw materials and improve the mechanical property of the material; the foamed plastic material obtained by injection molding has small micropore size, uniform micropore distribution and excellent mechanical property.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1: a microcellular foaming injection molding process of a plastic cover plate comprises the following steps:
(1) preparing and fully drying the following raw materials in parts by weight: 80 parts of PC/ABS alloy, 15 parts of coumarone-indene resin, 30 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether polymer with the copolymerization quantity of perfluoroalkyl vinyl ether not more than 4%, 8 parts of acetylated tributyl citrate and 15 parts of modified additive; the PC/ABS alloy is a PC/ABS alloy material with 70% of PC content, and the PC/ABS alloy in the following embodiments is also a PC/ABS alloy material with 70% of PC content;
(2) fully and uniformly mixing the raw materials to obtain a uniformly mixed material;
(3) feeding the uniformly mixed material obtained in the step (2) into a cylinder of an injection molding machine through a charging barrel, melting and uniformly mixing the uniformly mixed material through heating and stirring of a screw, and then using a supercritical fluid control device to control a certain amount of N2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(4) and (3) rapidly heating to enable the homogeneous system in the step (3) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
Further, the modified additive is modified nano brucite fiber, and the preparation method comprises the following steps: taking nano brucite fiber powder, performing ultrasonic treatment in a deionized water bath, then precipitating, centrifuging, taking a solid, fully drying at 100 ℃, using acetic acid as a catalyst, using trifluoropropyltrimethoxysilane as a modifier for surface modification, and performing treatment at 80 ℃ for 2 hours.
Further, the injection molding process of the injection molding machine in the step (3) and the step (4) comprises the following steps: the preplasticizing quantity is 22mm, the temperature of the injection melt is 270 ℃, the injection speed is 80mm/s, the gas injection time is 7s, the injection pressure is 11MPa, and the mold temperature is 65 ℃.
Example 2: a microcellular foaming injection molding process of a plastic cover plate comprises the following steps:
(1) preparing and fully drying the following raw materials in parts by weight: 60 parts of PC/ABS alloy, 5 parts of coumarone-indene resin, 10 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether polymer with the copolymerization quantity of perfluoroalkyl vinyl ether not more than 4%, 3 parts of acetylated tributyl citrate and 1 part of modified additive;
(2) fully and uniformly mixing the raw materials to obtain a uniformly mixed material;
(3) feeding the uniformly mixed material obtained in the step (2) into a cylinder of an injection molding machine through a charging barrel, melting and uniformly mixing the uniformly mixed material through heating and stirring of a screw, and then using a supercritical fluid control device to control a certain amount of N2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(4) and (3) rapidly heating to enable the homogeneous system in the step (3) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
Furthermore, the modified additive is modified nano brucite fiber, and the preparation method is the same as that of example 1.
Further, the injection molding process of the injection molding machine in the step (3) and the step (4) comprises the following steps: the preplasticizing quantity is 20mm, the injection melt temperature is 265 ℃, the injection speed is 75mm/s, the gas injection time is 6s, the injection pressure is 10MPa, and the mold temperature is 60 ℃.
Example 3: a microcellular foaming injection molding process of a plastic cover plate comprises the following steps:
(1) preparing and fully drying the following raw materials in parts by weight: 100 parts of PC/ABS alloy, 30 parts of coumarone-indene resin, 50 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether polymer with the copolymerization quantity of perfluoroalkyl vinyl ether not more than 4%, 12 parts of acetylated tributyl citrate and 30 parts of modified additive;
(2) fully and uniformly mixing the raw materials to obtain a uniformly mixed material;
(3) obtained in the step (2)The uniformly mixed material enters a cylinder of an injection molding machine from a charging barrel, the uniformly mixed material is melted and uniformly mixed through heating and stirring of a screw rod, and then a certain amount of N is mixed by a supercritical fluid control device2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(4) and (3) rapidly heating to enable the homogeneous system in the step (3) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
Furthermore, the modified additive is modified nano brucite fiber, and the preparation method is the same as that of example 1.
Further, the injection molding process of the injection molding machine in the step (3) and the step (4) comprises the following steps: the preplasticizing quantity is 23mm, the temperature of the injection melt is 275 ℃, the injection speed is 85mm/s, the gas injection time is 8s, the injection pressure is 12MPa, and the mold temperature is 80 ℃.
Example 4: a microcellular foaming injection molding process of a plastic cover plate comprises the following steps:
(1) preparing and fully drying the following raw materials in parts by weight: 90 parts of PC/ABS alloy, 10 parts of coumarone-indene resin, 40 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether polymer with the copolymerization quantity of perfluoroalkyl vinyl ether not more than 4%, 5 parts of acetylated tributyl citrate and 25 parts of modified additive;
(2) fully and uniformly mixing the raw materials to obtain a uniformly mixed material;
(3) feeding the uniformly mixed material obtained in the step (2) into a cylinder of an injection molding machine through a charging barrel, melting and uniformly mixing the uniformly mixed material through heating and stirring of a screw, and then using a supercritical fluid control device to control a certain amount of N2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(4) and (3) rapidly heating to enable the homogeneous system in the step (3) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
Furthermore, the modified additive is modified nano brucite fiber, and the preparation method is the same as that of example 1.
Further, the injection molding process of the injection molding machine in the step (3) and the step (4) comprises the following steps: the preplasticizing amount is 21mm, the temperature of the injection melt is 268 ℃, the injection speed is 83mm/s, the gas injection time is 6.5s, the injection pressure is 12MPa, and the mold temperature is 75 ℃.
Comparative example 1: PC/ABS alloy material with 70% PC content.
Comparative example 2: a microcellular foaming injection molding process of a plastic cover plate comprises the following steps:
(1) taking PC/ABS alloy as a raw material;
(2) the PC/ABS alloy is fed into the cylinder of injection machine from charging barrel, the mixture is melted and mixed uniformly by heating and stirring of screw, and then a certain amount of N is mixed by supercritical fluid control device2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(3) and (3) rapidly heating to enable the homogeneous system in the step (2) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
Further, the injection molding process of the injection molding machine in the step (2) and the step (3) comprises the following steps: the preplasticizing amount is 21mm, the temperature of the injection melt is 268 ℃, the injection speed is 83mm/s, the gas injection time is 6.5s, the injection pressure is 12MPa, and the mold temperature is 75 ℃.
The materials obtained in the above examples and comparative examples were observed and photographed by SEM at ten thousand times, and the micropores shown in the SEM photographs were measured, and the average micropore diameter and the micropore distribution were observed, and the mechanical properties were measured by a standard test method. The performance test results are as follows:
performance of Micropore diameter (mum) Distribution of micropores 1/4' flexural Strength (MPa) 1/4' notched impact Strength (kJ/m)2）
Example 1 0.277 Uniformity 104 67
Example 2 0.295 Uniformity 99 66
Example 3 0.310 Uniformity 108 58
Example 4 0.281 Uniformity 102 64
Comparative example 1 - - 78 40
Comparative example 2 0.513 Poor uniformity 62 28

Claims (7)

1. A microcellular foaming injection molding process of a plastic cover plate is characterized in that: the method comprises the following steps:
(1) preparing and fully drying the following raw materials: PC/ABS alloy, coumarone-indene resin, tetrafluoroethylene-perfluoroalkyl vinyl ether polymer, acetylated tributyl citrate and modified additive;
(2) fully and uniformly mixing the raw materials to obtain a uniformly mixed material;
(3) feeding the uniformly mixed material obtained in the step (2) into a cylinder of an injection molding machine through a charging barrel, melting and uniformly mixing the uniformly mixed material through heating and stirring of a screw, and then using a supercritical fluid control device to control a certain amount of N2Injecting the mixture into a machine barrel, and forming a polymer/gas homogeneous system under the stirring and shearing actions of a screw;
(4) and (3) rapidly heating to enable the homogeneous system in the step (3) to be in an unstable state, separating out a large number of micropore bubbles in the polymer to form nuclei, performing injection molding, growing micropores of the melt entering the mold cavity due to pressure rapid reduction, and finally cooling and shaping.
2. The microcellular foam injection molding process for a plastic decking of claim 1, wherein: the raw materials in the step (1) comprise the following components in parts by weight: 60-100 parts of PC/ABS alloy, 5-30 parts of coumarone-indene resin, 10-50 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether polymer, 3-12 parts of acetylated tributyl citrate and 1-30 parts of modified additive.
3. The microcellular foam injection molding process of a plastic decking according to claim 1 or 2, wherein: the copolymerization amount of the perfluoroalkyl vinyl ether in the tetrafluoroethylene-perfluoroalkyl vinyl ether polymer is not more than 4 percent.
4. The microcellular foam injection molding process of a plastic decking according to claim 1 or 2, wherein: the modified additive is modified nano brucite fiber.
5. The microcellular foaming injection molding process for a plastic cover plate according to claim 4, wherein: the preparation method of the modified nano brucite fiber comprises the following steps: taking nano brucite fiber powder, performing ultrasonic treatment in a deionized water bath, then precipitating, centrifuging, taking a solid, fully drying at 100 ℃, using acetic acid as a catalyst, using trifluoropropyltrimethoxysilane as a modifier for surface modification, and performing treatment at 80 ℃ for 2 hours.
6. The microcellular foam injection molding process for a plastic decking of claim 1, wherein: the injection molding process of the injection molding machine in the steps (3) and (4) comprises the following steps: the pre-molding amount is 20-23mm, the injection melt temperature is 265-275 ℃, the injection speed is 75-85mm/s, the gas injection time is 6-8s, the injection pressure is 10-12MPa, and the mold temperature is 60-80 ℃.
7. The microcellular foaming injection molding process of a plastic cover plate according to claim 6, wherein: the injection molding process of the injection molding machine in the steps (3) and (4) comprises the following steps: the preplasticizing quantity is 22mm, the temperature of the injection melt is 270 ℃, the injection speed is 80mm/s, the gas injection time is 7s, the injection pressure is 11MPa, and the mold temperature is 65 ℃.
CN201911376766.9A 2019-12-27 2019-12-27 Microcellular foaming injection molding process for plastic cover plate Pending CN111070607A (en)

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CN105776406A (en) * 2016-04-21 2016-07-20 苏州云舒新材料科技有限公司 Oil-containing wastewater treatment material and preparation method thereof
CN107903525A (en) * 2017-12-01 2018-04-13 苏州科茂电子材料科技有限公司 High-strength ageing composite material and preparation method for electronic product casing
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WO2014091808A1 (en) * 2012-12-14 2014-06-19 オカモト株式会社 Wrap film for wrapping food
CN104853918A (en) * 2012-12-14 2015-08-19 冈本株式会社 Wrap film for wrapping food
CN103612398A (en) * 2013-11-27 2014-03-05 福州大学 Microporous PC/ABS (Polycarbonate/Acrylonitrile Butadiene Styrene) alloy and preparation method thereof
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