CN107379386A - A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist - Google Patents
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist Download PDFInfo
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- CN107379386A CN107379386A CN201710721464.5A CN201710721464A CN107379386A CN 107379386 A CN107379386 A CN 107379386A CN 201710721464 A CN201710721464 A CN 201710721464A CN 107379386 A CN107379386 A CN 107379386A
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- polypropylene
- foamed
- micropowder
- micro mist
- temperature
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Classifications
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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 for being foamed using polypropylene micro mist and preparing lightweight foamed plastics, is related to polypropylene foam technical field, comprises the following steps：（1）PP GRANULES is put into vacuum drying chamber processing 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, quickly heated under less than polypropylene fusion temperature conditionss using microwave, the heat time is 3 6min, then is warming up at a temperature of polypropylene fusion and heats, and the heat time is 60 120s, obtains foamed；（5）By foamed water cooling to after 80 90 DEG C, room temperature is then air-cooled to, produces loose porous polypropylene foam.The present invention is using the expanded polypropylene under non-melt state, steep that wall rupture when reducing foaming, abscess the problems such as caving in, the significant increase quality of foam.
Description
Technical field
The present invention relates to polypropylene foam technical field, and in particular to one kind prepares lightweight using the foaming of polypropylene micro mist
The method of foamed plastics.
Background technology
Contain a large amount of bubbles in foamed plastics, therefore all have 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
Industry, the foamed plastics such as dress, building and transport have occupied the status do not replaced.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 PS and PE expanded materials have many defects, for example PS expanded materials are difficult degraded under natural environment, are discarded
Environment is caused afterwards serious " white pollution ", can given off poisonous gas during burning；PS and PE expanded material heat resistances are poor,
Obvious 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) progressed into the visual field of foaming researcher, PP expanded materials not only have many excellent performances, and it is recyclable again
Utilize, it is degradable under natural environment.
EPP（Expanded Polypropylene）That is expanded polypropylene material, remarkable as a kind of performance is highly crystalline
Type polymer/gas recombination material, fastest-rising environment-friendly novel resistance to compression at present is turned into its unique and superior performance and buffered
Heat-barrier material.EPP products have very excellent antidetonation energy absorption performance, response rate is high after deformation, good heat resistance, chemically-resistant
Product, oil resistivity and thermal insulation；Meanwhile its light weight, article quality can be greatly reduced；In addition, EPP or a kind of environmentally friendly material
Material, it is prone to which β degrades, and PP foams are easy to recycle, and its environment friendly is better than other foamed materials, thus is referred to as
" green " foam.The excellent properties showed just because of it so that EPP turns into after polystyrene（EPS）, polyurethane
（EPU）, polyethylene（EPE）The novel foam material of application value and market potential is had more after foamed material.
Expanded polypropylene（EPP）With polyethylene foamed（EPE）And expanded polystyrene (EPS)（EPS）Etc. comparing, specifically have following
The advantages of many unique：1）Mechanical property：Because 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：A methyl in polypropylene molecule be present, its 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 can substitute EPS materials and EPE materials in auto industry, transport service, the great competitiveness of application of packaging industry, apply
Prospect is boundless.
The PP of conventional method production is a kind of line style semicrystalline polymeric, and strand is seldom branched, molecular weight distribution phase
To narrower, this cause its softening point and fusing point very close to.Before temperature reaches fusing point, it does not flow substantially, when temperature surpasses
After crossing fusing point, melt strength drastically declines, and this melt is difficult to encase gas；In addition, polypropylene is changed into crystallization from molten state
State can release substantial amounts of heat, longer the time required to being solid by melt transform；In addition polypropylene air penetrability is high, and foamed gas are easy
Escape.Therefore it is narrow suitable for polypropylene expanded temperature range, foaming process is difficult control, easily causes steep that wall in foaming process to break
Split, gas is escaped, abscess caves in and bubble merges.The PP foam material technological means of high quality is obtained at present, is mainly enclosed
Around the melt strength for being raising PP, including the means such as grafting, cross-linking modified and blending and modifying.Do not retrieve also and be relevant at present
The document and patent of expanded polypropylene under non-melt state.
The content of the invention
For current PP low melt strengths, ventilative high characteristic, gas is caused to be difficult to the bubble to form closing 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, cause the defects of unstable of foaming, the present invention proposes that one kind prepares lightweight foam plastic using the foaming of polypropylene micro mist
The method of material, so as to realize the expanded polypropylene under non-melt state, steep that wall rupture when reducing foaming, abscess the problems such as caving in,
The significant increase quality of foam.
To solve the above problems, the present invention uses following technical scheme：
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing 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, added under less than polypropylene fusion temperature conditionss using microwave
The hot time is 3-6min, the inert gas expanded by heating in the polypropylene micropowder of fluffy is formed complex, then be warming up to poly-
Heated under propylene melting temperature, heat time 60-120s, obtain foamed；
（5）By foamed water cooling to after 80-90 DEG C, room temperature is then air-cooled to, produces loose porous polypropylene foam.
Polypropylene does not flow substantially before temperature reaches fusing point, after temperature exceedes fusing point, melt strength drastically under
Drop, this melt is difficult to encase gas；In addition, polypropylene is changed into crystalline state from molten state can release substantial amounts 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 are easily escaped.Therefore suitable for polypropylene expanded
Temperature range is narrow, and foaming process is difficult control, easily causes steep that wall rupture in foaming process, gas escape, abscess caves in 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 unmanageable, and causing to foam unstable is difficult to control
System.
Physical blowing agent is used in the present invention, inert gas is passed into closed mold according to certain speed, makes to gather
Propylene micropowder fluffy, inert gas is filled between polypropylene micropowder molecule, and progressivelyes reach saturation, forms indifferent gas
The structure phase system of body-polypropylene micropowder, then quickly heated under the conditions of less 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 with more preferable
Penetrability；Microwave is instantaneous heat temperature raising to the mode of heating of dielectric material, and its mode of heating belongs to internal heating, and electromagnetic energy is straight
Connect and act on medium molecule, change into heat, and transmission performance makes material inside and outside medium while is heated, it is not necessary to heat transfer；Due to
The very fast rise of temperature, and due to the penetrability heating of microwave heating so that the structure phase body of inert gas-polypropylene micropowder
Supersaturated state thermodynamically is presented in gas in system, and moment forms substantial amounts of complex, and gas continues to spread into complex,
And bubble starts to expand, so as to be internally formed a large amount of bubbles in polypropylene, the expanded polypropylene under non-melt state, reduce foaming
When steep that wall rupture, abscess the problems such as caving in, the significant increase quality of foam, and use inert gas, using physical blowing
Method, technique is simple, and cost is reduced compared to what chemical blowing process increased, and without any side effects to human body, will not be dirty
Contaminate environment；Then raise temperature at a temperature of polypropylene fusion and heat so that be bonded together, cool down well between polypropylene molecule
Loose porous polypropylene foam is obtained afterwards.
Polypropylene removes moisture therein, it is preferable that the step using needing that pretreatment is dried as previous（1）
The temperature of middle drying process is 110-120 DEG C, drying time 3-5h.
Polypropylene powder is broken into micropowder and is advantageous to the diffusion of gas wherein, forms fluffy structure, it is preferable that described
Step（2）In be ground into the micropowder of 70-150 mesh.
Selection inert gas has no side effect and not polluted the environment to human body as foaming agent, it is preferable that the step（3）
The one kind of middle inert gas in 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 step（3）The flow of middle inert gas is 5-10L/min.
Preferably, the step（4）In less than polypropylene fusion temperature conditionss be 140-150 DEG C, microwave heating frequency
For 2450MHz.
Preferably, the step（4）In be warming up to polypropylene fusion temperature temperature conditionss be 170-180 DEG C, microwave adds
Hot frequency is 2450MHz.
The type of cooling is also to influence a key factor of polypropylene micro mist foaming, favourable using water cooling fast cooling
Make it that PP foam material, which is made, forms stable foam structure in the rapid shaping of PP foam material, then through air cooling,
Preferably, the step（5）Hollow cold is natural cooling or air-cooled cooling in air.
The invention provides a kind of method for being foamed using polypropylene micro mist and preparing lightweight foamed plastics, with prior art
Compare, its protrude the characteristics of and excellent effect be：
1st, the method using microwave heating expanded polypropylene micro mist under non-melt state is proposed.
2nd, 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
Fluffy, then quickly heated under less than polypropylene fusion temperature conditionss using microwave, polypropylene micro mist is dredged after cohering
The porous polypropylene foam of pine, the problems such as steep that wall rupture, abscess cave in when reducing foaming, the significant increase quality of foam.
3rd, the present invention in using inert gas be used as foaming agent, it is without any side effects to human body, its foaming cost it is low,
Do not pollute the environment, there is significant application value.
Embodiment
Below by way of embodiment, the present invention is described in further detail, but this should not be interpreted as to the present invention
Scope be only limitted to following example.In the case where not departing from above method thought 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 kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing 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, added under less than polypropylene fusion temperature conditionss using microwave
The hot time is 3min, the inert gas expanded by heating in the polypropylene micropowder of fluffy is formed complex, then be warming up to poly- third
Heated under alkene melting temperature, heat time 60s, obtain foamed；
（5）By foamed water cooling to after 80 DEG C, room temperature is then air-cooled to, produces loose porous polypropylene foam.
Embodiment 2
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing is dried, drying temperature is 110 DEG C, drying time 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
Flow is 5L/min；
（4）Closed mold is put into microwave heating chamber, quickly heated under less than polypropylene fusion temperature conditionss using microwave, temperature
Degree condition is 140 DEG C, microwave heating frequency 2450MHz, heat time 3min, is made in the polypropylene micropowder of fluffy
Inert gas expanded by heating forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature conditionss are 170 DEG C, and microwave adds
Hot frequency is 2450MHz, heat time 60s, obtains foamed；
（5）By foamed water cooling to after 80 DEG C, room temperature is then naturally cooled in atmosphere, produces loose porous polypropylene bubble
Foam plastics.
Embodiment 3
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing is dried, drying temperature is 115 DEG C, and drying time is
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, is passed through two
The flow of carbonoxide is 6L/min；
（4）Closed mold is put into microwave heating chamber, quickly heated under less than polypropylene fusion temperature conditionss using microwave, temperature
Degree condition is 145 DEG C, microwave heating frequency 2450MHz, heat time 4min, is made in the polypropylene micropowder of fluffy
Inert gas expanded by heating forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature conditionss are 175 DEG C, and microwave adds
Hot frequency is 2450MHz, heat time 60s, obtains foamed；
（5）By foamed water cooling to after 85 DEG C, room temperature is then naturally cooled in atmosphere, produces loose porous polypropylene bubble
Foam plastics.
Embodiment 4
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing is dried, drying temperature is 115 DEG C, drying time 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
Flow is 8L/min；
（4）Closed mold is put into microwave heating chamber, quickly heated under less than polypropylene fusion temperature conditionss using microwave, temperature
Degree condition is 145 DEG C, microwave heating frequency 2450MHz, heat time 5min, is made in the polypropylene micropowder of fluffy
Inert gas expanded by heating forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature conditionss are 175 DEG C, and microwave adds
Hot frequency is 2450MHz, heat time 90s, obtains foamed；
（5）By foamed water cooling to after 85 DEG C, room temperature is then naturally cooled in atmosphere, produces loose porous polypropylene bubble
Foam plastics.
Embodiment 5
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing is dried, drying temperature is 120 DEG C, and drying time is
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, is passed through two
The flow of carbonoxide is 9L/min；
（4）Closed mold is put into microwave heating chamber, quickly heated under less than polypropylene fusion temperature conditionss using microwave, temperature
Degree condition is 140 DEG C, microwave heating frequency 2450MHz, heat time 6min, is made in the polypropylene micropowder of fluffy
Inert gas expanded by heating forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature conditionss are 180 DEG C, and microwave adds
Hot frequency is 2450MHz, heat time 100s, obtains foamed；
（5）It is then air-cooled to be cooled to room temperature by foamed water cooling to after 90 DEG C, produce loose porous polypropylene foam.
Embodiment 6
A kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, is comprised the following steps：
（1）PP GRANULES is put into vacuum drying chamber processing is dried, drying temperature is 120 DEG C, drying time 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 gas
Flow is 10L/min；
（4）Closed mold is put into microwave heating chamber, quickly heated under less than polypropylene fusion temperature conditionss using microwave, temperature
Degree condition is 150 DEG C, microwave heating frequency 2450MHz, heat time 6min, is made in the polypropylene micropowder of fluffy
Inert gas expanded by heating forms complex, then is warming up at a temperature of polypropylene fusion and heats, and temperature conditionss are 180 DEG C, and microwave adds
Hot frequency is 2450MHz, heat time 120s, obtains foamed；
（5）It is then air-cooled to be cooled to room temperature by foamed water cooling to after 90 DEG C, produce loose porous polypropylene foam.
The whole abscess of polypropylene micro mist foaming preparation lightweight foam and abscess will be utilized close in embodiment 2-6 in the present invention
Degree is detected, and testing result see the table below.
Cell diameter and the cell density detection of the foamed material of table 1
Claims (8)
- A kind of 1. method for preparing lightweight foamed plastics that foamed using polypropylene micro mist, it is characterised in that comprise the following steps：（1）PP GRANULES is put into vacuum drying chamber processing 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, added under less than polypropylene fusion temperature conditionss using microwave The hot time is 3-6min, the inert gas expanded by heating in the polypropylene micropowder of fluffy is formed complex, then be warming up to poly- Heated under propylene melting temperature, heat time 60-120s, obtain foamed；（5）By foamed water cooling to after 80-90 DEG C, room temperature is then air-cooled to, produces loose porous polypropylene foam.
- 2. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（1）The temperature of middle drying process is 110-120 DEG C, drying time 3-5h.
- 3. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（2）In be ground into the micropowder of 70-150 mesh.
- 4. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（3）The one kind of middle inert gas in nitrogen, carbon dioxide and argon gas.
- 5. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（3）The flow of middle inert gas is 5-10L/min.
- 6. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（4）In less than polypropylene fusion temperature conditionss be 140-150 DEG C, microwave heating frequency 2450MHz.
- 7. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（4）In to be warming up to the temperature conditionss of polypropylene fusion temperature be 170-180 DEG C, microwave heating frequency is 2450MHz。
- 8. a kind of method for preparing lightweight foamed plastics that foamed using polypropylene micro mist according to claim 1, its feature It is, the step（5）Hollow cold is natural cooling or air-cooled cooling in air.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| WO2021179645A1 (en) * | 2020-03-09 | 2021-09-16 | 苏州申赛新材料有限公司 | In-mold one-time foaming molding process and foam product |
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| WO2021179645A1 (en) * | 2020-03-09 | 2021-09-16 | 苏州申赛新材料有限公司 | In-mold one-time foaming molding process and foam 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 |