CN112936713A - Production process of foamed polypropylene EPP material for packaging box - Google Patents

Production process of foamed polypropylene EPP material for packaging box Download PDF

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Publication number
CN112936713A
CN112936713A CN202110095947.5A CN202110095947A CN112936713A CN 112936713 A CN112936713 A CN 112936713A CN 202110095947 A CN202110095947 A CN 202110095947A CN 112936713 A CN112936713 A CN 112936713A
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steam
pressure
pressing
raw material
parts
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CN112936713B (en
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邵兴荣
张�杰
郑杨
王融彬
李家林
沈球国
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Hefei Yiwu New Material Technology Co ltd
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Hefei Yiwu New Material Technology Co ltd
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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
    • B29C44/60—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
    • 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
    • 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
    • B29C44/3415—Heating or cooling
    • B29C44/3426—Heating by introducing steam in the mould
    • 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/14—Copolymers of polypropylene
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/14—Copolymers of propene
    • 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
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • 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
    • C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
    • 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
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention relates to the technical field of foamed plastics, and provides a production process of a foamed polypropylene EPP material for a packaging box.

Description

Production process of foamed polypropylene EPP material for packaging box
Technical Field
The invention relates to the technical field of foamed plastics, in particular to a production process of a foamed polypropylene EPP material for a packaging box.
Background
The foam plastic has the advantages of light specific gravity, heat insulation, shock resistance, pressure resistance, good elasticity, low price and the like, thereby being widely applied to the field of packaging. However, the expanded polystyrene and the expanded polyurethane can cause serious pollution to the environment in the use process, isocyanate residues harmful to human bodies exist in the polyurethane foam in the foaming process and cannot be recycled repeatedly, chlorofluorocarbon compounds or butane can be generally used in the foaming process of the polystyrene foam, the polystyrene foam is difficult to degrade and easily causes white pollution, and the environmental protection organization of the united nations has decided to stop using the polystyrene foam products. The rigidity of the polyethylene foam plastic is low, and the maximum using temperature is 80 ℃. The foamed polypropylene EPP is an environment-friendly material, is nontoxic and harmless in the manufacturing process, can be recycled, has high use temperature, is a high-crystallization polymer/gas composite material with excellent performance, and becomes the fastest-growing environment-friendly novel compression-resistant buffering heat-insulating material at present.
However, the existing foamed polypropylene EPP material has insufficient compression resistance, buffering and heat insulation performance, low hardness and poor molding quality. The technical problem to be solved by the invention is to provide a production process of a foamed polypropylene EPP material for a packaging box, which can effectively overcome the defects of poor welding and unstable density of the foamed polypropylene EPP material in the forming process, and further can improve the welding rate and density stability of a foamed polypropylene EPP box product.
Disclosure of Invention
The invention aims to provide a production process of a foamed polypropylene EPP material for a packaging box, which adopts a specific composition and a specific production process and is used for solving the problems of low foaming rate, insufficient hardness, high operation cost and the like of polypropylene in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of a foamed polypropylene EPP material for a packing box body is characterized by comprising the following steps:
(1) raw material polypropylene particles and a foaming agent are sent to a pressure soaking tank through a feeding system and are processed through specific material pressing process parameters, and the specific material pressing process comprises the following steps:
the first stage is as follows: applying pressure of 0.05 MPa-0.1 MPa to the raw materials in the soaking tank, wherein the pressing time is 35-45 minutes;
and a second stage: after the first material pressing is finished, increasing the pressure to 0.3-0.4MPa, and pressing for 180-200 minutes;
and a third stage: after the second material pressing is finished, reducing the pressure to 0.2-0.25MPa, and pressing for 100-120 minutes;
a fourth stage: after the third material pressing is finished, reducing the pressure to 0.1-0.15MPa, and pressing for 60-70 minutes;
(2) after the raw material pressing process is finished, the raw material is conveyed into a material cylinder of a forming machine through a material pipe conveying system, a sensor monitors the content of the raw material in the material cylinder in real time in the process, a valve is automatically opened after the content of the raw material is lower than a set amount, and the raw material enters the material cylinder;
(3) the raw materials are precisely fed into a forming die cavity from a material cylinder through a material gun, and are subjected to hot plastic forming after being heated at high temperature by steam;
(4) after falling off from the die, the product is placed in a special drying vehicle and is packaged and delivered after being dried.
The step (3) comprises the following steps: a. steam scouring: opening a steam inlet valve above the steam chamber and a condensed water discharge valve below the steam chamber to flush the steam from top to bottom so as to discharge air out of the steam chamber and discharge the condensed water;
b. transverse steam: the steam is swept from one side of the steam chamber to the raw material, penetrates through the raw material and then reaches the other side of the steam chamber and is sprayed out;
c. pressure maintenance: after the steam is transversely introduced, the temperature in the mold can generally reach more than 140 ℃, an upper steam inlet valve is opened, a lower condensed water discharge valve is closed, the pressure gradually reaches the peak value of 0.9-1.5MPa, and then the pressure is kept for 20-50 s;
d. and (3) cooling and stabilizing: cooling water spraying and vacuum negative pressure waste heat absorbing are adopted to reduce the temperature of the mold to about 50-70 ℃ so as to ensure smooth demolding of the product;
e. and (6) demolding.
Wherein the foaming ratio of the foaming polypropylene is 15-50 times, and the density is 0.03-0.07g/cm3. The foaming agent is supercritical nitrogen fluid, and the formula of the polypropylene particles comprises the following components in parts by weight: 80-95 parts of terpolymer of propylene, ethylene and 1-pentene, 5-10 parts of polyethylene octene elastomer, 5-10 parts of glycidyl methacrylate grafted polypropylene, 2-5 parts of silicon dioxide, 0.1-0.3 part of silane coupling agent, 0.5-2 parts of aromatic amide nucleating agent and 1-2 parts of antistatic agent.
The aromatic amide nucleating agent is N, N dicyclohexyl terephthalamide, N-dicyclohexyl phthalic diamide, N-dianiline adipamide and the like, the silane coupling agent is KH550, KH560 or KH602, and the antistatic agent is N, N-dihydroxyethyl octadecylamine.
The terpolymer of propylene, ethylene and 1-pentene has a melting point of less than 140 ℃, a molecular weight distribution Mw/Mn of 5-25 and a melt index of 5-10g/10 min. The polyethylene octene elastomer is dispersed in the propylene copolymer, so that the toughness of the propylene copolymer can be improved, and the good impact resistance of the product can be ensured. The silicon dioxide can not only increase the strength of the melt and improve the rigidity, but also has high heat conductivity coefficient, can quickly transfer heat and save the steam consumption. The glycidyl methacrylate grafted polypropylene is used as a compatilizer, the compatibility among the components is adjusted, the silane coupling agent improves the dispersibility, and the good compatibility can ensure the growth density and the integrity of the cells.
The invention has the following beneficial effects: the foaming polypropylene EPP material for the packing box body has no toxic substances in the production process, and is environment-friendly. Through a specific material pressing process, namely a specific material pressing process in four stages of pressurization, pressure relief and pressure maintaining, the foaming agent can be fully soaked in the polypropylene, uniform foaming is facilitated, the material density is uniform, and the overall material performance is stable. And then the heat is quickly transferred by washing with upper and lower steam and penetrating through transverse steam, the polypropylene is uniformly melted, expanded and bonded, and finally the obtained product has uniform and complete foam pores, high foaming ratio and difficult deformation. The gas retained in the foam holes absorbs energy, so that excellent compression-resistant buffering performance is provided, the filler is well fixed in the foam forming body during uniform expansion to form a continuous network, excellent surface appearance and rigidity are provided, and the requirement of packaging hardness is met. The process is simple and convenient to operate, easy to control, low in operation cost and suitable for large-scale production, popularization and application.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions in the present application will be clearly and completely described below with reference to the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A production process of a foamed polypropylene EPP material for a packing box body is characterized by comprising the following steps:
(1) raw material polypropylene particles and a foaming agent are sent to a pressure soaking tank through a feeding system and are processed through specific material pressing process parameters, and the specific material pressing process comprises the following steps:
the first stage is as follows: applying pressure of 0.05MPa to the raw materials in the soaking tank, wherein the pressing time is 35 minutes;
and a second stage: after the first pressing is finished, increasing the pressure to 0.3MPa, and pressing for 180 minutes;
and a third stage: after the second pressing is finished, reducing the pressure to 0.2MPa, and pressing for 100 minutes;
a fourth stage: after the third pressing is finished, reducing the pressure to 0.1MPa, and pressing for 60 minutes;
(2) after the raw material pressing process is finished, the raw material is conveyed into a material cylinder of a forming machine through a material pipe conveying system, a sensor monitors the content of the raw material in the material cylinder in real time in the process, a valve is automatically opened after the content of the raw material is lower than a set amount, and the raw material enters the material cylinder;
(3) the raw materials are precisely fed into a forming die cavity from a material cylinder through a material gun, and are subjected to hot plastic forming after being heated at high temperature by steam;
(4) after falling off from the die, the product is placed in a special drying vehicle and is packaged and delivered after being dried.
The step (3) comprises the following steps: a. steam scouring: opening a steam inlet valve above the steam chamber and a condensed water discharge valve below the steam chamber to flush the steam from top to bottom so as to discharge air out of the steam chamber and discharge the condensed water;
b. transverse steam: the steam is swept from one side of the steam chamber to the raw material, penetrates through the raw material and then reaches the other side of the steam chamber and is sprayed out;
c. pressure maintenance: after steam is transversely introduced, an upper steam inlet valve is opened, a lower condensed water discharge valve is closed, the pressure gradually reaches the peak value of 0.9MPa, and then the pressure is kept for 20 s;
d. and (3) cooling and stabilizing: cooling water spraying and vacuum negative pressure waste heat absorption are adopted, so that the temperature of the mold is reduced to about 50 ℃, and smooth demolding of the product is ensured;
e. and (6) demolding.
The foaming agent is supercritical nitrogen fluid, and the formula of the polypropylene particles comprises the following components in parts by weight: 80 parts of terpolymer of propylene, ethylene and 1-pentene, 5 parts of polyethylene octene elastomer, 5 parts of glycidyl methacrylate grafted polypropylene, 2 parts of silicon dioxide, KH 5500.1 parts of silane coupling agent, 0.5 part of N, N-dicyclohexyl terephthalamide and 1 part of N, N-dihydroxyethyl octadecylamine.
The foaming ratio of the foamed polypropylene prepared by the method is 17.2 times, and the density is 0.067g/cm3The foam cells are uniform and the appearance is good, the compression strength MPa (25% deformation) measured by the ISO844 test method is 1.2, and the tensile strength measured by the ISO1798 test method is 7.8 MPa.
Example 2
A production process of a foamed polypropylene EPP material for a packing box body is characterized by comprising the following steps:
(1) raw material polypropylene particles and a foaming agent are sent to a pressure soaking tank through a feeding system and are processed through specific material pressing process parameters, and the specific material pressing process comprises the following steps:
the first stage is as follows: applying pressure of 0.1MPa to the raw materials in the soaking tank, wherein the pressing time is 45 minutes;
and a second stage: after the first pressing is finished, increasing the pressure to 0.4MPa, and pressing for 200 minutes;
and a third stage: after the second material pressing is finished, reducing the pressure to 0.25MPa, and pressing for 120 minutes;
a fourth stage: after the third pressing is finished, reducing the pressure to 0.15MPa, and pressing for 70 minutes;
(2) after the raw material pressing process is finished, the raw material is conveyed into a material cylinder of a forming machine through a material pipe conveying system, a sensor monitors the content of the raw material in the material cylinder in real time in the process, a valve is automatically opened after the content of the raw material is lower than a set amount, and the raw material enters the material cylinder;
(3) the raw materials are precisely fed into a forming die cavity from a material cylinder through a material gun, and are subjected to hot plastic forming after being heated at high temperature by steam;
(4) after falling off from the die, the product is placed in a special drying vehicle and is packaged and delivered after being dried.
The step (3) comprises the following steps: a. steam scouring: opening a steam inlet valve above the steam chamber and a condensed water discharge valve below the steam chamber to flush the steam from top to bottom so as to discharge air out of the steam chamber and discharge the condensed water;
b. transverse steam: the steam is swept from one side of the steam chamber to the raw material, penetrates through the raw material and then reaches the other side of the steam chamber and is sprayed out;
c. pressure maintenance: after steam is transversely introduced, an upper steam inlet valve is opened, a lower condensed water discharge valve is closed, the pressure gradually reaches the peak value of 1.5MPa, and then the pressure is kept for 50 s;
d. and (3) cooling and stabilizing: cooling water spraying and vacuum negative pressure waste heat absorbing are adopted, so that the temperature of the mold is reduced to about 70 ℃, and smooth demolding of the product is ensured;
e. and (6) demolding.
The foaming agent is supercritical nitrogen fluid, and the formula of the polypropylene particles comprises the following components in parts by weight: 95 parts of propylene, ethylene and 1-pentene terpolymer, 10 parts of polyethylene octene elastomer, 10 parts of methacrylic acid glycidyl ether grafted polypropylene, 5 parts of silicon dioxide, KH 5500.3 parts of silane coupling agent, 2 parts of N, N dicyclohexyl terephthalamide and 2 parts of N, N-dihydroxyethyl octadecylamine.
The foaming ratio of the foamed polypropylene prepared by the method is 45 times, and the density is 0.034g/cm3The foam cells are uniform and the appearance is good, the compression strength MPa (25% deformation) measured by the ISO844 test method is 0.4, and the tensile strength measured by the ISO1798 test method is 4.7 MPa.
Comparative example 1
Compared with the example 1, the step (1) is that raw material polypropylene particles and foaming agent are sent to a pressure impregnation tank through a feeding system, the pressure is directly applied to the raw material in the impregnation tank to 0.3MPa, and the raw material is pressed for 375 minutes. The rest is the same as in example 1.
The prepared foamed polypropylene has the foaming ratio of 14.2 times and the density of 0.087g/cm3The cells were not uniform and the appearance was poor, the compressive strength MPa (25% deformation) measured by ISO844 test method was 0.7, and the tensile strength measured by ISO1798 test method was 5.4 MPa.
Comparative example 2
In comparison with example 1, step (1) was to feed raw polypropylene particles and a foaming agent into a pressure impregnation tank via a feed system, apply a pressure of 0.1MPa to the raw material in the impregnation tank for a pressing time of 75 minutes, and then increase the pressure to 0.3MPa for 300 minutes. The rest is the same as in example 1.
The prepared foamed polypropylene has the foaming ratio of 14.9 times and the density of 0.074g/cm3The cells were not uniform and the appearance was poor, the compressive strength MPa (25% deformation) measured by ISO844 test method was 0.9, and the tensile strength measured by ISO1798 test method was 5.9 MPa.
Comparative example 3
Compared with the embodiment 1, the step (3) does not carry out the steps of steam scouring and transverse steam penetration, the upper steam inlet valve is directly opened, the lower condensed water discharge valve is closed, the pressure gradually reaches the peak value of 0.9MPa, and then the pressure is maintained for 20 s. The rest is the same as in example 1.
The prepared foamed polypropylene has the foaming ratio of 14.5 times and the density of 0.076g/cm3The cells were not uniform and the appearance was poor, the compressive strength MPa (25% deformation) measured by ISO844 test method was 0.8, and the tensile strength measured by ISO1798 test method was 5.7 MPa.
Comparative example 4
Compared with the example 1, the formula of the polypropylene particle comprises the following components in parts by weight: 80 parts of terpolymer of propylene, ethylene and 1-pentene, 5 parts of polyethylene octene elastomer, 2 parts of silicon dioxide and 1 part of N, N-dihydroxyethyl octadecylamine. The rest is the same as in example 1.
The prepared foaming polypropylene has the foaming ratio of 17.6 times and the density of 0.063g/cm3However, the cells are not complete enough to form a network with poor continuity, a compressive strength MPa (25% deformation) of 0.7 as determined by ISO844 test method and a tensile strength of 4.5MPa as determined by ISO1798 test method.
The present invention is not limited to the above exemplary embodiments, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A production process of a foamed polypropylene EPP material for a packing box body is characterized by comprising the following steps:
(1) raw material polypropylene particles and a foaming agent are sent to a pressure soaking tank through a feeding system and are processed through specific material pressing process parameters, and the specific material pressing process comprises the following steps:
the first stage is as follows: applying pressure of 0.05 MPa-0.1 MPa to the raw materials in the soaking tank, wherein the pressing time is 35-45 minutes;
and a second stage: after the first material pressing is finished, increasing the pressure to 0.3-0.4MPa, and pressing for 180-200 minutes;
and a third stage: after the second material pressing is finished, reducing the pressure to 0.2-0.25MPa, and pressing for 100-120 minutes;
a fourth stage: after the third material pressing is finished, reducing the pressure to 0.1-0.15MPa, and pressing for 60-70 minutes;
(2) after the raw material pressing process is finished, the raw material is conveyed into a material cylinder of a forming machine through a material pipe conveying system, a sensor monitors the content of the raw material in the material cylinder in real time in the process, a valve is automatically opened after the content of the raw material is lower than a set amount, and the raw material enters the material cylinder;
(3) the raw materials are precisely fed into a forming die cavity from a material cylinder through a material gun, and are subjected to hot plastic forming after being heated at high temperature by steam;
(4) after falling off from the die, the product is placed in a special drying vehicle and is packaged and delivered after being dried.
The step (3) comprises the following steps: a. steam scouring: opening a steam inlet valve above the steam chamber and a condensed water discharge valve below the steam chamber to flush the steam from top to bottom so as to discharge air out of the steam chamber and discharge the condensed water;
b. transverse steam: the steam is swept from one side of the steam chamber to the raw material, penetrates through the raw material and then reaches the other side of the steam chamber and is sprayed out;
c. pressure maintenance: after the steam is transversely introduced, opening a steam inlet valve at the upper part, closing a condensed water discharge valve at the lower part, enabling the pressure to gradually reach the peak value of 0.9-1.5MPa, and then keeping the pressure for 20-50 s;
d. and (3) cooling and stabilizing: cooling water spraying and vacuum negative pressure waste heat absorbing are adopted to reduce the temperature of the mold to about 50-70 ℃ so as to ensure smooth demolding of the product;
e. and (6) demolding.
2. The process for producing the expanded polypropylene EPP material for the packing body according to claim 1, wherein the temperature inside the mold reaches 140 ℃ or higher after the steam is introduced.
3. The process for producing the expanded polypropylene EPP material for the packaging body according to claim 1, wherein the foaming agent is a supercritical nitrogen fluid.
4. The production process of the expanded polypropylene EPP material for the packing case as claimed in claim 1, wherein the formula of the polypropylene particles comprises the following components in parts by weight: 80-95 parts of terpolymer of propylene, ethylene and 1-pentene, 5-10 parts of polyethylene octene elastomer, 5-10 parts of glycidyl methacrylate grafted polypropylene, 2-5 parts of silicon dioxide, 0.1-0.3 part of silane coupling agent, 0.5-2 parts of aromatic amide nucleating agent and 1-2 parts of antistatic agent.
5. The process for producing the expanded polypropylene EPP material for the packing cases as claimed in claim 1, wherein the aromatic amide-based nucleating agent is N, N-dicyclohexyl terephthalamide, N-dicyclohexyl phthalamide, N-dianiline adipamide or the like.
6. The process for producing the expanded polypropylene EPP material for the packing body according to claim 1, wherein the silane coupling agent is KH550, KH560 or KH 602.
7. The production process of the expanded polypropylene EPP material for the packing box body according to claim 1, wherein the antistatic agent is N, N-dihydroxyethyl octadecylamine.
CN202110095947.5A 2021-01-25 2021-01-25 Production process of foamed polypropylene EPP material for packaging box Active CN112936713B (en)

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CN102886855A (en) * 2012-09-20 2013-01-23 太原市伦嘉生态健康家居科技有限公司 Method for manufacturing function division foam mat body
CN107200929A (en) * 2016-03-16 2017-09-26 青岛科技大学 A kind of propylene copolymer microcellular foam material and preparation method thereof
CN109306121A (en) * 2018-09-27 2019-02-05 合肥朗胜新材料有限公司 A kind of EPP packing plastics foam and preparation method thereof
CN110978368A (en) * 2019-11-21 2020-04-10 四川力登维汽车部件有限公司 Method for improving surface hardness performance and appearance quality of EPP product
CN112109264A (en) * 2019-06-19 2020-12-22 浙江吉智新能源汽车科技有限公司 Foaming and self-skinning process of EPP material for automobile interior and exterior trim parts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102886855A (en) * 2012-09-20 2013-01-23 太原市伦嘉生态健康家居科技有限公司 Method for manufacturing function division foam mat body
CN107200929A (en) * 2016-03-16 2017-09-26 青岛科技大学 A kind of propylene copolymer microcellular foam material and preparation method thereof
CN109306121A (en) * 2018-09-27 2019-02-05 合肥朗胜新材料有限公司 A kind of EPP packing plastics foam and preparation method thereof
CN112109264A (en) * 2019-06-19 2020-12-22 浙江吉智新能源汽车科技有限公司 Foaming and self-skinning process of EPP material for automobile interior and exterior trim parts
CN110978368A (en) * 2019-11-21 2020-04-10 四川力登维汽车部件有限公司 Method for improving surface hardness performance and appearance quality of EPP product

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