CN107379386B - A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics - Google Patents
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics Download PDFInfo
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- CN107379386B CN107379386B CN201710721464.5A CN201710721464A CN107379386B CN 107379386 B CN107379386 B CN 107379386B CN 201710721464 A CN201710721464 A CN 201710721464A CN 107379386 B CN107379386 B CN 107379386B
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- polypropylene
- micropowder
- micro mist
- temperature
- foamed
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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
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- 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
- B29C44/3403—Foaming under special conditions, e.g. in sub-atmospheric pressure, in or on a liquid
-
- 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
-
- 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
- B29C44/3461—Making or treating expandable particles
-
- 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
- B29C44/3469—Cell or pore nucleation
- B29C44/348—Cell or pore nucleation by regulating the temperature and/or the pressure, e.g. suppression of foaming until the pressure is rapidly decreased
-
- 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
- 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
- B29K2023/12—PP, i.e. polypropylene
Abstract
The present invention provides a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics, is related to polypropylene foam technical field, comprising the following steps: (1) PP GRANULES is put into vacuum oven and is dried；(2) PP GRANULES after drying process is added in grinder and is ground into micropowder；(3) polypropylene micropowder is added in closed mold, being passed through inert gas makes polypropylene micropowder fluffy；(4) closed mold is put into microwave heating chamber, is quickly heated under the conditions of being lower than polypropylene fusion temperature using microwave, heating time 3-6min, then be warming up at a temperature of polypropylene fusion and heat, heating time 60-120s obtains foamed；(5) then foamed water cooling is air-cooled to room temperature to after 80-90 DEG C to get loose porous polypropylene foam.The problems such as present invention uses the expanded polypropylene under non-melt state, and steep that wall rupture, abscess collapse when reducing foaming, the significant increase quality of foam.
Description
Technical field
The present invention relates to polypropylene foam technical fields, and in particular to a kind of to utilize the foaming preparation lightweight of polypropylene micro mist
The method of foamed plastics.
Background technique
Contain a large amount of bubbles in foamed plastics, therefore all has that light, material-saving, impact resistance, heat-insulated and sound insulation value be good, ratio
The denominators such as intensity height.Domestic and international foam industry have developed rapidly in recent decades, and application surface is more and more wider, especially wrap
Industries, the foamed plastics such as dress, building and transport have occupied the status that do not replace.With the development of science and technology, new foam
Plastics variety, new forming method constantly occur and it is perfect.
Polymeric foamable material is various in style, wherein most widely used is polystyrene (PS) and polyethylene (PE) foaming
Material.But there are many defects, such as PS foamed material to be difficult to degrade in a natural environment for PS and PE foamed material, discards
Environment is caused serious " white pollution " afterwards, when burning can give off poisonous gas；PS and PE foamed material heat resistance is poor,
Apparent thermal deformation can occur at 105 DEG C, be not suitable for using at a higher temperature.Therefore, their application receives very big
Limitation.Since the 1970s, as the third-largest general-purpose plastics polypropylene for being only second to PE and polyvinyl chloride (PVC)
(PP) visual field of foaming researcher has been progressed into, PP foamed material not only has many excellent performances, but also can be recycled again
It utilizes, it is degradable in a natural environment.
EPP(Expanded Polypropylene) i.e. expanded polypropylene material, as a kind of brilliant highly crystalline of performance
Type polymer/gas recombination material becomes fastest-rising environment-friendly novel resistance to compression buffering at present with its unique and superior performance
Heat-barrier material.EPP product has response rate height, good heat resistance, chemically-resistant after very excellent antidetonation energy absorption performance, deformation
Product, oil resistivity and thermal insulation；Meanwhile light weight, article quality can be greatly reduced；In addition, EPP or a kind of environmentally friendly material
Material, it is prone to β degradation, and PP foam, convenient for recycling, environment friendly is better than other foamed materials, thus is referred to as
" green " foam.Just because of the excellent properties that it is showed, so that EPP becomes after polystyrene (EPS), polyurethane
(EPU), the novel foam material of application value and market potential is had more after polyethylene (EPE) foamed material.
Expanded polypropylene (EPP) specifically has following compared with polyethylene foamed (EPE) and expanded polystyrene (EPS) (EPS) etc.
The advantage of many uniquenesses: 1) mechanical property: since polyacrylic bending modulus is much larger than polyethylene, so that EPP is anti-static negative
Loading capability is better than EPE, and impact resistance is better than EPS；2) heat resistance: EPP can make for a long time in 120 DEG C or so of hot environment
With being that heat resistance is best in foamed plastics；3) degradability: there are a methyl in polypropylene molecule, degradation property will be bright
It is aobvious to be better than polyethylene and polystyrene.In addition, EPP also has excellent resistance to chemical corrosion and stress crack resistance performance.EPP
Material auto industry, transport service, packaging industry using great competitiveness, EPS material and EPE material can be substituted, apply
Prospect is boundless.
The PP of conventional method production is a kind of line style semicrystalline polymeric, the seldom branching of strand, molecular weight distribution phase
To relatively narrow, this cause its softening point and fusing point very close to.Before temperature reaches fusing point, it is not flowed substantially, when temperature is super
After crossing fusing point, melt strength sharply declines, and this melt is difficult to encase gas；In addition, polypropylene is changed into crystallization from molten state
State can release a large amount of heat, longer the time required to being solid by melt transform；In addition polypropylene air penetrability is high, and foamed gas is easy
Escape.Therefore it is narrow suitable for polypropylene expanded temperature range, foaming process is difficult to control, and easily causes steep that wall in foaming process broken
It splits, gas escape, abscess collapses and bubble merges.The PP foam material technological means of high quality is obtained at present, is mainly enclosed
Around means such as the melt strengths, including grafting, cross-linking modified and blending and modifying for being raising PP.It does not retrieve also and is relevant at present
The document and patent of expanded polypropylene under non-melt state.
Summary of the invention
For current PP low melt strength, high characteristic of breathing freely, gas is caused to be difficult to form closed bubble in system,
The melt strength of its PP polymer is improved in existing foaming method using modified techniques such as grafting, crosslinkings, process control needs are difficult
With control, the unstable defect that foams is caused, the present invention proposes that a kind of foam using polypropylene micro mist prepares lightweight foam plastic
The method of material, thus realize the expanded polypropylene under non-melt state, when reducing foaming the problems such as steep that wall rupture, abscess collapsing,
The significant increase quality of foam.
To solve the above problems, the invention adopts the following technical scheme:
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried；
(2) PP GRANULES after drying process is added in grinder and is ground into micropowder；
(3) polypropylene micropowder is added in closed mold, being passed through inert gas makes polypropylene micropowder fluffy；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, heating time 3-6min make the inert gas expanded by heating in the polypropylene micropowder of fluffy form complex, then heat up
It is heated at a temperature of to polypropylene fusion, heating time 60-120s obtains foamed；
(5) foamed water cooling is moulded to get loose porous polypropylene foam to after 80-90 DEG C, being then air-cooled to room temperature
Material.
Polypropylene does not flow substantially before temperature reaches fusing point, when temperature be more than fusing point after, melt strength sharply under
Drop, this melt are difficult to encase gas；In addition, polypropylene, which is changed into crystalline state from molten state, can release a large amount of heat, by melting
Body is longer the time required to being changed into solid；In addition polypropylene air penetrability is high, and foamed gas is easily escaped.Therefore it is suitable for polypropylene expanded
Temperature range is narrow, and foaming process is difficult to control, and easily causes steep that wall rupture in foaming process, gas escape, abscess collapsing and gas
Bubble merges.The PP foam material technological means of high quality is obtained at present, mainly around the melt strength for being raising PP, including
The means such as grafting, cross-linking modified and blending and modifying, process control needs are higher to be difficult to control, and causing to foam unstable is difficult to control
System.
Physical blowing agent is used in the present invention, and inert gas is passed into closed mold according to certain rate, makes to gather
Propylene micropowder fluffy, inert gas is filled between polypropylene micropowder molecule, and progressivelyes reach saturation, forms indifferent gas
Then body-polypropylene micropowder structure phase system is quickly heated under the conditions of being lower than melting temperature using microwave, using microwave plus
Heat, microwave is than other electromagnetic waves for radiant heating, as infrared ray, far infrared equiwavelength are longer, therefore has better
Penetrability；Microwave is instantaneous heat temperature raising to the heating method of dielectric material, and heating method belongs to internal heating, and electromagnetic energy is straight
It connects and acts on medium molecule, be converted to heat, and transmission performance makes material inside and outside medium while being heated, and does not need heat transfer；Due to
The very fast raising of temperature, and since the penetrability of microwave heating heats, so that inert gas-polypropylene micropowder structure phase body
Supersaturated state thermodynamically is presented in gas in system, and moment forms a large amount of complex, and gas continues to spread into complex,
And bubble starts to expand, to form a large amount of bubbles inside polypropylene, the expanded polypropylene under non-melt state reduces foaming
When steep that wall rupture, abscess the problems such as collapsing, the significant increase quality of foam, and use inert gas, using physical blowing
Method, simple process are reduced costs compared to what chemical blowing process increased, and without any side effects to human body, will not be dirty
Contaminate environment；It then raises temperature at a temperature of polypropylene fusion and heats, so that be bonded together well between polypropylene molecule, it is cooling
Loose porous polypropylene foam is obtained afterwards.
Polypropylene removes moisture therein, it is preferable that the step (1) using needing that pretreatment is dried as previous
The temperature of middle drying process is 110-120 DEG C, drying time 3-5h.
Polypropylene powder is broken into micropowder and is conducive to gas in diffusion wherein, forms fluffy structure, it is preferable that described
The micropowder of 70-150 mesh is ground into step (2).
It selects inert gas without side-effects to human body as foaming agent and does not pollute the environment, it is preferable that the step (3)
Middle inert gas is selected from one of nitrogen, carbon dioxide and argon gas.
Control inert gas flow be influence fluffy degree a key factor, the excessive then polypropylene micropowder of flow without
Sequence, the too small then fluffy degree of flow are bad, it is preferable that the flow of inert gas is 5-10L/min in the step (3).
It preferably, is 140-150 DEG C lower than the temperature condition of polypropylene fusion in the step (4), microwave heating frequency
For 2450MHz.
Preferably, the temperature condition that polypropylene fusion temperature is warming up in the step (4) is 170-180 DEG C, and microwave adds
Hot frequency is 2450MHz.
The type of cooling is also to influence a key factor of polypropylene micro mist foaming, advantageous using water cooling fast cooling
Obtained PP foam material is made to form stable foam structure in the rapid shaping of PP foam material, then through air-cooled,
Preferably, step (5) hollow cold is natural cooling or air-cooled cooling in air.
The present invention provides a kind of methods using polypropylene micro mist foaming preparation lightweight foamed plastics, with the prior art
It compares, the feature and excellent effect protruded is:
1, the method using microwave heating expanded polypropylene micro mist under non-melt state is proposed.
2, the present invention is that will be passed through inert gas in polypropylene micropowder to make it using the expanded polypropylene under non-melt state
Then fluffy is quickly heated under the conditions of being lower than polypropylene fusion temperature using microwave, polypropylene micro mist is dredged after cohering
The problems such as porous polypropylene foam of pine, steep that wall rupture, abscess collapse when reducing foaming, the significant increase quality of foam.
3, use inert gas as foaming agent in the present invention, without any side effects to human body, the cost of foaming is low,
It does not pollute the environment, there is significant application value.
Specific embodiment
In the following, the present invention will be further described in detail by way of specific embodiments, but this should not be interpreted as to the present invention
Range be only limitted to example below.Without departing from the idea of the above method of the present invention, according to ordinary skill
The various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried；
(2) PP GRANULES after drying process is added in grinder and is ground into micropowder；
(3) polypropylene micropowder is added in closed mold, being passed through inert gas makes polypropylene micropowder fluffy；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, heating time 3min make the inert gas expanded by heating in the polypropylene micropowder of fluffy form complex, then are warming up to
It is heated at a temperature of polypropylene fusion, heating time 60s obtains foamed；
(5) then foamed water cooling is air-cooled to room temperature to after 80 DEG C to get loose porous polypropylene foam.
Embodiment 2
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried, drying temperature is 110 DEG C, drying time
For 3h；
(2) PP GRANULES after drying process is added in grinder to the micropowder for being ground into 70 mesh；
(3) polypropylene micropowder is added in closed mold, being passed through nitrogen makes polypropylene micropowder fluffy, is passed through nitrogen
The flow of gas is 5L/min；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, temperature condition are 140 DEG C, microwave heating frequency 2450MHz, heating time 3min, make the polypropylene micro mist of fluffy
Inert gas expanded by heating in end forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature condition is 170 DEG C,
Microwave heating frequency is 2450MHz, and heating time 60s obtains foamed；
(5) by foamed water cooling to after 80 DEG C, then in air cooled to room temperature to get loose porous poly- third
Alkene foamed plastics.
Embodiment 3
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried, drying temperature is 115 DEG C, drying time
For 3.5h；
(2) PP GRANULES after drying process is added in grinder to the micropowder for being ground into 100 mesh；
(3) polypropylene micropowder is added in closed mold, being passed through carbon dioxide makes polypropylene micropowder fluffy, leads to
The flow for entering carbon dioxide is 6L/min；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, temperature condition are 145 DEG C, microwave heating frequency 2450MHz, heating time 4min, make the polypropylene micro mist of fluffy
Inert gas expanded by heating in end forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature condition is 175 DEG C,
Microwave heating frequency is 2450MHz, and heating time 60s obtains foamed；
(5) by foamed water cooling to after 85 DEG C, then in air cooled to room temperature to get loose porous poly- third
Alkene foamed plastics.
Embodiment 4
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried, drying temperature is 115 DEG C, drying time
For 4h；
(2) PP GRANULES after drying process is added in grinder to the micropowder for being ground into 120 mesh；
(3) polypropylene micropowder is added in closed mold, being passed through nitrogen makes polypropylene micropowder fluffy, is passed through nitrogen
The flow of gas is 8L/min；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, temperature condition are 145 DEG C, microwave heating frequency 2450MHz, heating time 5min, make the polypropylene micro mist of fluffy
Inert gas expanded by heating in end forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature condition is 175 DEG C,
Microwave heating frequency is 2450MHz, and heating time 90s obtains foamed；
(5) by foamed water cooling to after 85 DEG C, then in air cooled to room temperature to get loose porous poly- third
Alkene foamed plastics.
Embodiment 5
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried, drying temperature is 120 DEG C, drying time
For 4.5h；
(2) PP GRANULES after drying process is added in grinder to the micropowder for being ground into 140 mesh；
(3) polypropylene micropowder is added in closed mold, being passed through carbon dioxide makes polypropylene micropowder fluffy, leads to
The flow for entering carbon dioxide is 9L/min；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, temperature condition are 140 DEG C, microwave heating frequency 2450MHz, heating time 6min, make the polypropylene micro mist of fluffy
Inert gas expanded by heating in end forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature condition is 180 DEG C,
Microwave heating frequency is 2450MHz, and heating time 100s obtains foamed；
(5) then air-cooled to be cooled to room temperature to get loose porous polypropylene foam modeling by foamed water cooling to after 90 DEG C
Material.
Embodiment 6
A method of it is foamed using polypropylene micro mist and prepares lightweight foamed plastics, comprising the following steps:
(1) PP GRANULES is put into vacuum oven and is dried, drying temperature is 120 DEG C, drying time
For 5h；
(2) PP GRANULES after drying process is added in grinder to the micropowder for being ground into 150 mesh；
(3) polypropylene micropowder is added in closed mold, being passed through argon gas makes polypropylene micropowder fluffy, is passed through argon
The flow of gas is 10L/min；
(4) closed mold is put into microwave heating chamber, is quickly added under the conditions of being lower than polypropylene fusion temperature using microwave
Heat, temperature condition are 150 DEG C, microwave heating frequency 2450MHz, heating time 6min, make the polypropylene micro mist of fluffy
Inert gas expanded by heating in end forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature condition is 180 DEG C,
Microwave heating frequency is 2450MHz, and heating time 120s obtains foamed；
(5) then air-cooled to be cooled to room temperature to get loose porous polypropylene foam modeling by foamed water cooling to after 90 DEG C
Material.
The abscess and abscess that utilize polypropylene micro mist foaming preparation lightweight foam end in the present invention in embodiment 2-6 is close
Degree is detected, and testing result see the table below.
The cell diameter and cell density of 1 foamed material of table detect
Claims (8)
1. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics, which comprises the following steps:
(1) PP GRANULES is put into vacuum oven and is dried；
(2) PP GRANULES after drying process is added in grinder and is ground into micropowder；
(3) polypropylene micropowder is added in closed mold, being passed through inert gas makes polypropylene micropowder fluffy；
(4) closed mold is put into microwave heating chamber, is quickly heated, is added under the conditions of being lower than polypropylene fusion temperature using microwave
The hot time is 3-6min, so that the inert gas expanded by heating in the polypropylene micropowder of fluffy is formed complex, then be warming up to poly-
It is heated under propylene melting temperature, heating time 60-120s obtains foamed；
(5) then foamed water cooling is air-cooled to room temperature to after 80-90 DEG C to get loose porous polypropylene foam.
2. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, the temperature being dried in the step (1) is 110-120 DEG C, drying time 3-5h.
3. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, the micropowder of 70-150 mesh is ground into the step (2).
4. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, inert gas is selected from one of nitrogen and argon gas in the step (3).
5. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, the flow of inert gas is 5-10L/min in the step (3).
6. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, the temperature condition that polypropylene fusion is lower than in the step (4) is 140-150 DEG C, microwave heating frequency 2450MHz.
7. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, the temperature condition that polypropylene fusion temperature is warming up in the step (4) is 170-180 DEG C, and microwave heating frequency is
2450MHz。
8. a kind of method using polypropylene micro mist foaming preparation lightweight foamed plastics according to claim 1, feature
It is, step (5) hollow cold is natural cooling or air-cooled cooling in air.
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| CN112140443A (en) * | 2019-06-28 | 2020-12-29 | 广州捷佛明新材料科技有限公司 | Plastic foam forming process |
| CN111300713B (en) * | 2020-03-09 | 2022-04-26 | 苏州申赛新材料有限公司 | One-time foaming forming process in mold and foaming product |
| CN112497556A (en) * | 2020-10-28 | 2021-03-16 | 泰州诺盟新材料科技有限公司 | Method for manufacturing polypropylene composite material |
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Denomination of invention: A method for preparing lightweight foamed plastics by foaming polypropylene micropowder Effective date of registration: 20220818 Granted publication date: 20190423 Pledgee: Zhejiang Pinghu Rural Commercial Bank Co.,Ltd. Guangchen sub branch Pledgor: ZHEJIANG LONGYUAN HIGH POLYMER SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2022330001821 |