CN104987526B - Composite foamed particle of polypropylene-based resin and preparation method and application - Google Patents
Composite foamed particle of polypropylene-based resin and preparation method and application Download PDFInfo
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Abstract
The invention discloses composite foamed particle of a kind of polypropylene-based resin and preparation method and application, belong to expanded material technical field.The technical problem that briquetting pressure is high, and preparation cost is high, molding cycle is grown is solved in the composite foamed granule die of polypropylene-based resin in the prior art.The expanded beads, medium method for releasing is dispersed through by blending resin particle and is prepared, the cell diameter of expanded beads increases successively from the inside to the outside, cortex mean cell diameter Rs and sandwich layer mean cell diameter R0Meet following relational expressions：1≤Rs/R0≤5；Wherein, blending resin particle contains matrix resin and inorganic interleaving agent, and the mass fraction of inorganic interleaving agent is 1 20%, and matrix resin is polypropylene-based resin, and inorganic interleaving agent is laminated inorganic matter.Steam consumption can be greatly reduced by preparing expanded moldings using the expanded beads of the present invention, shortened molding cycle, reduced the cost of preparation, and obtained expanded moldings surface is smooth, pliability is excellent.
Description
Technical field
The invention belongs to expanded material technical field, and in particular to a kind of composite foamed particle of polypropylene-based resin and its system
Preparation Method and application.
Background technology
The expanded bead molding that polypropylene-based resin is formed is due to good cushioning ability and heat resistance, in recent years
Come, the application in automotive field, electronic product packaging field is more and more extensive.But the fusing point of polypropylene-based resin is higher, is
In in-molded polypropylene resin foam particle, it is necessary at least 0.4Mpa water vapor pressure, 10-40kg vapor
Amount.With environmental requirement more and more higher, the use of coal-burning boiler has become increasingly limited, and the consumption of vapor also results in
The production cost more and more higher for the expanded bead molding that polypropylene-based resin is formed, in addition, in-molded polypropylene-based resin
The molding cycle of expanded beads is longer.So need the PP composite material that a kind of in-molded time is short, briquetting pressure is small badly
Expanded beads.
The content of the invention
Present invention aim to address the in-molded pressure height of PP composite material expanded beads in the prior art, prepare
Cost is high, the technical problem of molding cycle length, there is provided a kind of composite foamed particle of polypropylene-based resin and preparation method thereof is with answering
With.
It is as follows that the present invention solves the technical scheme that above-mentioned technical problem uses.
The composite foamed particle of polypropylene-based resin, medium method for releasing is dispersed through by blending resin particle and is prepared；
The cell diameter of the expanded beads increases successively from the inside to the outside, cortex mean cell diameter Rs and sandwich layer average bubble
Bore dia R0Meet following relational expressions：1≤Rs/R0≤5；
The blending resin particle is cylindrical structural, a diameter of 0.5-2mm, highly 1-2 times for diameter, blending resin
Containing matrix resin and inorganic interleaving agent in particle, matrix resin is polypropylene-based resin, and inorganic interleaving agent is laminated inorganic matter,
The mass percent of inorganic interleaving agent is 1-20%.
Preferably, the polypropylene-based resin is ethylene-propylene random copolymer, the random copolymer of propene-1-butene -1, second
One or more mixing in alkene-random copolymer of propene-1-butene -1.
Preferably, additive is also contained in the blending resin particle, the additive is toughener, antioxidant, anti-purple
It is one or more in outside line agent, antistatic additive, fire retardant, matal deactivator, pigment, dyestuff, nucleator, bladder regulator
The mass ratio of mixing, matrix resin and additive is 100:(0.1-30).
Preferably, the toughener is one or more mixing in PP-g-MA, POE-g-MA, PE-g-MA, described
Bladder regulator is one or more mixing in Firebrake ZB, talcum powder, calcium carbonate, aluminium hydroxide.
Preferably, the inorganic interleaving agent is montmorillonite, mica, kaolin, graphene, one kind in lamellar graphite or more
The mixing of kind.
Preferably, the cortex mean cell diameter Rs and sandwich layer mean cell diameter R0Meet following relational expressions：1.2≤
Rs/R0≤3。
The preparation method of the above-mentioned composite foamed particle of polypropylene-based resin, comprises the following steps：
Step 1: after matrix resin and inorganic interleaving agent are well mixed, add in extruder, co-extrusion is melted with wire
Go out, cooling, pelletizing, obtain blending resin particle；
When also containing additive in blending resin particle, additive, matrix resin and inorganic interleaving agent are well mixed
Afterwards, add in extruder, melted and be coextruded with wire, cooling, pelletizing, obtain blending resin particle；
Step 2: blending resin particle, foaming agent, surfactant, dispersant and decentralized medium are added into closed container
In, temperature of low 5-10 DEG C than blowing temperature is heated under stirring, 10-60min is incubated, blowing temperature is warming up to, in constant temperature
Continue to be incubated 15-60min under degree, open closed container, by blending resin particle, foaming agent, surfactant, dispersant and divide
Dispersion media is discharged under the environment lower than the pressure in closed container, foaming, obtains the composite foamed particle of polypropylene-based resin；
The blowing temperature is the blowing temperature of matrix resin in blending resin particle；
The blending resin particle, surfactant, the weight part ratio of dispersant and decentralized medium are 100:(0.0001-
0.5):(0.1-15):(100-500)；
The pressure of foaming agent is 0.6-6MPa in the closed container.
Preferably, the foaming agent is propane, butane, hexane, heptane, cyclobutane, hexamethylene, chlorofluoromethane, fluoroform
Alkane, 1,2- Difluoroethanes, HFA 134a, monochloro methane, chloroethanes, dichloromethane, nitrogen, oxygen, air, carbon dioxide
In one or more mixing.
The application of the above-mentioned composite foamed particle of polypropylene-based resin, it is that the composite foamed particle of polypropylene-based resin is placed in mould
It is in-molded in tool, obtain expanded moldings, the in-molded pressure with the expanded beads mould of corresponding matrix resin
The pressure of shaping is identical, and the in-molded vapor dosage water in-molded less than the expanded beads of corresponding matrix resin steams
Gas dosage, in-molded cycle are shorter than the expanded beads in-molded cycle of corresponding matrix resin.
Preferably, the in-molded pressure of the composite foamed particle of the polypropylene-based resin is 0.28-0.46MPa (G),
The in-molded cycle is 100-140s, and the consumption of in-molded vapor is 20-35kg/kg.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the composite foamed particle of polypropylene-based resin of the invention, is by containing polypropylene-based resin and inorganic interleaving agent
Blending resin particle, foam and form in the presence of foaming agent, because the presence of inorganic interleaving agent have impact on the infiltration of foaming agent
Property, cause foaming agent radial distribution in blending resin particle to be present, i.e. foaming agent is higher than in blending resin particle surface concentration
Blending resin granular center, by controlling foaming condition to control the time of penetration of blending resin particle and foaming agent, it can obtain
Blending resin particle with the distribution of density of foaming agent gradient, then by discharging foaming agent and blending resin particle to normal pressure
Under, so as to obtain the expanded beads of the present invention, there is excellent amalgamation between expanded beads of the invention；
2nd, the preparation method of the composite foamed particle of polypropylene-based resin of the invention is simple, easily operation；
3rd, the composite foamed particle of polypropylene-based resin of the invention, general forming machine can be used to be molded, in-molded
When, because the cell diameter of expanded beads outer layer is big, cell wall is thin, reduces the steam of expanded beads bonding needs, shaping week
Phase shortens, so polypropylene resin foam formed body, which is made, by the expanded beads can greatly reduce steam consumption, steam
Consumption is 20-35kg/kg, shortening molding cycle, molding cycle 100-140s, reduces the cost of preparation, obtained foaming
Formed body surface is smooth, pliability is excellent, is suitable for various packaging materials, padded coaming etc..
Brief description of the drawings
Fig. 1 is the electron scanning micrograph of the blending resin particle section of the embodiment of the present invention 1.
Embodiment
In order to further appreciate that the present invention, the preferred embodiments of the invention are retouched with reference to embodiment
State, but it is to be understood that these descriptions are simply for further explanation the features and advantages of the present invention rather than to patent of the present invention
It is required that limitation.
The composite foamed particle of polypropylene-based resin, medium method for releasing is dispersed through by blending resin particle and is prepared, this is multiple
The cell diameter for closing expanded beads increases successively from the inside to the outside, cortex mean cell diameter Rs and sandwich layer mean cell diameter R0It is full
Foot states relational expression：1≤Rs/R0≤ 5, as 1≤Rs/R0<When 1.2, because expanded beads cortex cell diameter and sandwich layer abscess are straight
Connect that difference is smaller, it is not fairly obvious to shorten molding cycle and reduce the effect of steam consumption, when 3<Rs/R0When≤5, skin foaming
Particle cortex cell diameter is excessive, and cell wall is excessively thin, and easily being collapsed during vapor hot briquetting causes expanded moldings
Dimensional discrepancy is excessive, and it is advantageous to 1.2≤Rs/R0≤ 3, by industrial general requirement, the particle diameter of composite foamed particle is generally 2-
5mm.Wherein, blending resin particle is cylindrical structural, a diameter of 0.5-2mm, highly 1-2 times for diameter, blending resin
Grain mainly contains matrix resin and inorganic interleaving agent, it is also possible to which, containing additive, the quality of inorganic interleaving agent accounts for blending resin
The 1-20%, preferably 2-5% of grain gross mass.The composite foamed particle can be in the foaming of the matrix resin in blending resin particle
Carried out under the in-molded pressure of particle in-molded, it is not necessary to improve pressure, shorten molding cycle, reduce steam consumption, one
As in-molded pressure be 0.28-0.46MPa (G), steam consumption 20-35kg/kg, molding cycle 100-140s.
In above-mentioned matrix resin, polypropylene-based resin is those skilled in the art's common used material, ethylene-propylene random copolymerization
Thing, the random copolymer of propene-1-butene -1, the random copolymer of ene-propylene-butene -1 etc., it can also be more that can use one kind
The mixing of kind in any proportion.Additive can be toughener, antioxidant, ultraviolet screener, antistatic additive, fire retardant, metal
Passivator, pigment, dyestuff, nucleator, bladder regulator etc..Wherein, toughener can be PP-g-MA, POE-g-MA, PE-g-
MA etc.；Bladder regulator can be the inorganic powders such as Firebrake ZB, talcum powder, calcium carbonate, aluminium hydroxide.Specific additive and its use
Measure and be modified typical additives and dosage for polypropylene-based resin, the mass ratio of general matrix resin and additive is 100:
(0.1-30)。
Above-mentioned inorganic interleaving agent, it is laminated inorganic matter, it can also be a variety of mixing in any proportion that can use a kind of,
Such as montmorillonite, mica, kaolin, graphene, lamellar graphite.
The preparation method of the above-mentioned composite foamed particle of polypropylene-based resin comprises the following steps：
Step 1: after matrix resin and inorganic interleaving agent are well mixed, add in extruder, co-extrusion is melted with wire
Go out, cool down, pelletizing, obtain blending resin particle；
Wherein, the hybrid mode of matrix resin and inorganic interleaving agent does not limit, as long as well mixed, can such as adopt
With solution mixing or mixing in situ；When also containing additive in blending resin particle, by additive, matrix resin and inorganic
Interleaving agent mixes in the lump, or by matrix resin replace with it is additive agent modified after matrix resin, other operations are constant；
Extruder can be double screw extruder or single screw extrusion machine, and extrusion temperature is more than matrix resin fusing point
Can；
Step 2: blending resin particle, foaming agent, surfactant, dispersant and decentralized medium are added in autoclave,
The temperature of low 5-10 DEG C of the blowing temperature than the matrix resin in blending resin particle is heated under stirring, is incubated 10-60min,
Soaking time is less than 10min, and foaming agent infiltration is poor, it is difficult to powerful expanded beads are obtained, soaking time is more than 60min,
Foaming agent obtains osmotic equilibrium in resin particle, and expanded beads sandwich layer is identical with cortex cell diameter, cannot be of the invention
Effect, is warming up to blowing temperature, continues at a constant temperature after being incubated 15-60min, foaming agent infiltration blending resin particle, beats
Autoclave is driven, while more than vapour pressure of the pressure in autoclave in foaming agent is kept, by blending resin particle, foaming
Agent, surfactant, dispersant and decentralized medium are discharged under the environment lower than the pressure in autoclave, are generally released to air
In pressure ring border, foaming, the composite foamed particle of polypropylene-based resin is obtained.Wherein, decentralized medium is water or alcohols, from operation angle
Degree consideration, preferably water.Surfactant is neopelex.Dispersant is kaolin, talcum powder, calcium carbonate, phosphoric acid
Calcium, alkali calcium phosphate etc..Foaming agent can be organic system physical blowing agent, such as propane, butane, hexane, heptane aliphatic alkane
Class, chlorofluoromethane, fluoroform, 1,2- Difluoroethanes, HFA 134a, monochloro methane, chloroethanes, dichloromethane etc.
The annular aliphatic alkanes such as halo alkanes, cyclobutane, hexamethylene；Can also be inorganic system's physical blowing agent, as nitrogen, oxygen, air,
Carbon dioxide etc.；Organic system physical blowing agent and inorganic system's physical blowing agent can also be used in combination；From being readily obtained low table
From the point of view of the expanded beads for seeing density, the inorganic system preferably more than one or both of nitrogen, oxygen, air, carbon dioxide
Physical blowing agent.Generally, the mass ratio of blending resin particle, surfactant, dispersant and decentralized medium is 100:
(0.0001-0.5):(0.1-15):(100-500), the loading of the foaming agent in autoclave used in the species of foaming agent,
The apparent density of blowing temperature and target expanded beads suitably selects, and typically under blowing temperature, ensures foaming agent in autoclave
Pressure be 0.6-6MPa.It should be noted that usually require that the apparent density of expanded beads is smaller, the pressure in above-mentioned autoclave
Power is higher, it is desirable to which the apparent density of target expanded beads is bigger, and the pressure in above-mentioned autoclave is lower.
The application of the above-mentioned composite foamed particle of polypropylene-based resin, it is that the composite foamed particle of polypropylene-based resin is placed in mould
It is in-molded in tool, water cooling, until the face pressure of the formed body in mould reaches 0.030-0.039MPa (G), it is removed from the molds
Formed body, 8-24h is maintained at 50-80 DEG C, is cooled to room temperature, obtains expanded moldings, wherein, in-molded pressure is together
The pressure that the expanded beads of matrix resin in mixed resin particle are in-molded is identical, generally 0.28-0.46MPa (G), in mould
The vapor dosage that the expanded beads of the more corresponding matrix resin of vapor dosage of shaping are in-molded reduces 5%-30%, disappears
Consumption is typically only 20-35kg/kg, the in-molded cycle time of expanded beads of in-molded cycle more corresponding matrix resin
5%-30%, in-molded cycle are generally 100-140s, define the expanded beads of matrix resin by matrix resin body (poly- third
Alkene system resin body) be dispersed through medium release foaming be prepared, compared with the present invention, that is, be added without inorganic interleaving agent, its
His condition is all identical.
The composite foamed particle cortex mean cell diameter Rs of polypropylene-based resin of the present invention and sandwich layer mean cell diameter R0
Assay method it is as follows：An expanded beads are first bisected into two parts, amplifying its section under the microscope afterwards makes section complete
Into shooting its section, as shown in Figure 1.According to its photo, straight line is drawn on photo makes section substantially be bisected into two parts, with straight
The length of line does great circle as diameter, and the quantity divided by great circle circumference income value for all abscesses that great circle circumference passes through are as one
The cortex mean cell diameter of individual expanded beads.Using the center of circle of great circle as the center of circle, make by diameter of a quarter of axis of great circle
Roundlet, the quantity divided by roundlet circumference income value of all abscesses that roundlet circumference passes through are put down as the sandwich layer of an expanded beads
Equal cell diameters.Identical operation is carried out to 20 expanded beads, average value of doing sums respectively is as cortex mean cell diameter
Rs and sandwich layer mean cell diameter R0。
With reference to embodiments and comparative example further illustrates the present invention.
Embodiment 1-15
The preparation of the composite foamed particle of polypropylene-based resin：
Step 1: by the composition and proportioning of Tables 1 and 2, the matrix resin of 100 parts by weight and inorganic is added into extruder
Interleaving agent, melting extrusion, cooling, pelletizing obtain a diameter of 1mm, length 1.8mm, and average weight is 1.8mg blending resin
Particle；
Step 2: the above-mentioned blending resin particle of 100 parts by weight (1000g), 300 parts by weight are added into 5L autoclave
(carbon dioxide being filled with ensures hair for water, 0.05 parts by weight neopelex, 0.3 parts by weight kaolin clay and carbon dioxide
Pressure at a temperature of bubble in autoclave is 6MPa), warming while stirring is to 5 DEG C lower than the blowing temperature of corresponding Tables 1 and 2
Temperature, 15min is incubated, blowing temperature and foamed time in Tables 1 and 2 is then respectively adopted, make foaming agent infiltration blending tree
Fat particle, open autoclave, supply carbon dioxide into autoclave, keep pressure in autoclave foaming agent vapour pressure with
While upper, under release blending resin particle, water, neopelex, kaolin and carbon dioxide to atmospheric pressure environment,
Foaming, obtains composite foamed particle.
The composite foamed particle that embodiment 1-15 is obtained is washed respectively, centrifugation, is placed 24h under atmospheric pressure and is maintained
Afterwards, the apparent density of expanded beads is determined, as a result as shown in Table 1 and Table 2.
The application of above-mentioned composite foamed particle：
Forming machine is using the small-scale forming machine for the saturated vapour pressure for being resistant to 0.48MPa (G), and mould is using tool
There is the metal pattern of 100mm × 100mm × 50mm molding spaces.In the state of metal pattern leaves gap (about 5mm), by compound hair
Particles filled into metal pattern, matched moulds is steeped, after discharging the air in metal pattern, embodiment 1-15 composite foamed particle is distinguished
Apply the steam pressure of Tables 1 and 2, after in-molded, water cooling, until the face pressure of the formed body in metal pattern reaches 0.039MPa
(G) formed body, is taken out from metal pattern, 24h is maintained at 80 DEG C, is cooled to room temperature, obtain expanded moldings.
Embodiment 1-15 molding cycles and vapor amounts specified and Tables 1 and 2, the hair obtained respectively to embodiment 1-15
Compressive strength, the outward appearance of bubble formed body are measured, as a result as shown in Table 1 and Table 2.
Comparative example 1-3
The preparation of the expanded beads of matrix resin：
Step 1: by the composition of table 2, matrix resin is added into extruder, melting extrusion, cooling, pelletizing, obtains diameter
For 1mm, length 1.8mm, average weight is 1.8mg matrix resin particles；
Step 2: it is identical with the step of embodiment 1-15 two, obtain the expanded beads of matrix resin.
The expanded beads of the obtained matrix resins of comparative example 1-3 are washed respectively, centrifuged, 24h is placed under atmospheric pressure and enters
After row maintenance, the apparent density of expanded beads is determined, as a result as shown in table 2.
The application of above-mentioned composite foamed particle：It is identical with embodiment 1-15.
Comparative example 1-3 molding cycles and vapor amounts specified and table 2, the foaming obtained respectively to comparative example 1-3
Compressive strength, the outward appearance of body are measured, as a result as shown in table 2.
Table 1 is embodiment 1-9 proportioning, condition of molding and testing result
Table 2 is embodiment 10-15 and comparative example 1-3 proportioning, condition of molding and testing result
In Tables 1 and 2, A represents ethylene-propylene random copolymer (140 DEG C of fusing point), and B represents propene-1-butene -1 randomly altogether
Polymers (135 DEG C of fusing point), C represent the random copolymer of ene-propylene-butene -1 (146 DEG C).Molding cycle represents that shaping is produced per mould
Time required for product, steam consumption represent the steam by weight required for every kilogram of expanded beads, expanded bead molding
Outward appearance is characterized by the hollow number between the expanded beads in 100 expanded beads areas.Hollow between expanded beads at 50 with
On be denoted as X, less than 50 at be denoted as O.
As can be seen from Table 1 and Table 2, embodiment 1-15 polypropylene-based resin composite foamed particle consumption water vapour amount with
Corresponding comparative example 1-3 compares, and reduces 5%-30%, and molding cycle shortens 5%-30%.The water particularly consumed in embodiment 8
Vapor volume reduces 37% compared with comparative example 1.The steam vapour amount that embodiment 15 consumes reduces 20% compared with comparative example 3.
Illustrate the expanded beads of the present invention, forming process reclaimed water steam consumption can be greatly reduced, shorten molding cycle.Wherein, it is real
The expanded beads of example 9 are applied because expanded beads cortex cell diameter is excessive, cause end article degraded appearance, so the present invention is excellent
Select 1.2≤Rs/R0≤3。
Obviously, the explanation of above example is only intended to help the method and its core concept for understanding the present invention.It should refer to
Go out, under the premise without departing from the principles of the invention, can also be to this hair for the those of ordinary skill of the technical field
Bright to carry out some improvement and modification, these are improved and modification is also fallen into the protection domain of the claims in the present invention.
Claims (8)
1. the composite foamed particle of polypropylene-based resin, it is characterised in that medium method for releasing is dispersed through by blending resin particle and prepared
Form；
The cell diameter of the expanded beads increases successively from the inside to the outside, and cortex mean cell diameter Rs and sandwich layer Average Cell are straight
Footpath R0Meet following relational expressions：1≤Rs/R0≤5；
The blending resin particle is cylindrical structural, a diameter of 0.5-2mm, highly 1-2 times for diameter, blending resin particle
In contain matrix resin and inorganic interleaving agent, matrix resin is polypropylene-based resin, and inorganic interleaving agent is laminated inorganic matter, inorganic
The mass percent of interleaving agent is 1-20%；
The inorganic interleaving agent is one or more mixing in montmorillonite, mica, kaolin, graphene, lamellar graphite.
2. the composite foamed particle of polypropylene-based resin according to claim 1, it is characterised in that the polypropylene-based resin
For one in ethylene-propylene random copolymer, the random copolymer of propene-1-butene -1, the random copolymer of ene-propylene-butene -1
Kind or a variety of mixing.
3. the composite foamed particle of polypropylene-based resin according to claim 1, it is characterised in that the blending resin particle
In also contain additive, the additive is toughener, antioxidant, ultraviolet screener, antistatic additive, fire retardant, metal passivation
The mass ratio of one or more mixing in agent, pigment, dyestuff, nucleator, bladder regulator, matrix resin and additive is
100:(0.1-30)。
4. the composite foamed particle of polypropylene-based resin according to claim 3, it is characterised in that the toughener is PP-
One or more mixing in g-MA, POE-g-MA, PE-g-MA, the bladder regulator are Firebrake ZB, talcum powder, carbonic acid
One or more mixing in calcium, aluminium hydroxide.
5. the composite foamed particle of polypropylene-based resin according to claim 1, it is characterised in that the cortex Average Cell
Diameter Rs and sandwich layer mean cell diameter R0Meet following relational expressions：1.2≤Rs/R0≤3。
6. the preparation method of the composite foamed particle of polypropylene-based resin described in claim 1-5 any one, it is characterised in that
Comprise the following steps：
Step 1: after matrix resin and inorganic interleaving agent are well mixed, add in extruder, melted and be coextruded with wire, it is cold
But, pelletizing, blending resin particle is obtained；
When also containing additive in blending resin particle, after additive, matrix resin and inorganic interleaving agent are well mixed, add
Enter in extruder, melted and be coextruded with wire, cooling, pelletizing, obtain blending resin particle；
Step 2: blending resin particle, foaming agent, surfactant, dispersant and decentralized medium are added in closed container, stir
Mix down and be heated to temperature of low 5-10 DEG C than blowing temperature, be incubated 10-60min, be warming up to blowing temperature, at a constant temperature after
Continue insurance warm 15-60min, closed container is opened, by blending resin particle, foaming agent, surfactant, dispersant and decentralized medium
It is discharged under the environment lower than the pressure in closed container, foams, obtain the composite foamed particle of polypropylene-based resin；
The blowing temperature is the blowing temperature of matrix resin in blending resin particle；
The blending resin particle, surfactant, the weight part ratio of dispersant and decentralized medium are 100:(0.0001-0.5):
(0.1-15):(100-500)；
The pressure of foaming agent is 0.6-6MPa in the closed container.
7. the preparation method of the composite foamed particle of polypropylene-based resin according to claim 6, it is characterised in that the hair
Infusion be propane, butane, hexane, heptane, cyclobutane, hexamethylene, chlorofluoromethane, fluoroform, 1,2- Difluoroethanes, 1,1,1,
One or more mixing in 2- HFC-134as, monochloro methane, chloroethanes, dichloromethane, nitrogen, oxygen, air, carbon dioxide.
8. the application of the composite foamed particle of polypropylene-based resin described in claim 1-5 any one, it is by polypropylene-based tree
The composite foamed particle of fat is placed in mould, in-molded, obtains expanded moldings, it is characterised in that the in-molded pressure
Power is identical with the pressure that the expanded beads of corresponding matrix resin are in-molded, and in-molded vapor dosage is less than corresponding
The in-molded vapor dosage of the expanded beads of matrix resin, the in-molded cycle be shorter than corresponding to matrix resin foaming
The grain in-molded cycle；
The in-molded pressure of the composite foamed particle of polypropylene-based resin is 0.28-0.46MPa (G), in-molded
Cycle is 100-140s, and the consumption of in-molded vapor is 20-35kg/kg.
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| CN107880386A (en) * | 2017-11-14 | 2018-04-06 | 东莞市鑫益电子科技有限公司 | A kind of preparation method of nanometer particle-modified polypropylene material |
| CN109080060B (en) * | 2018-07-25 | 2021-06-11 | 南通德亿新材料有限公司 | Seamless forming process for thermoplastic elastomer foaming beads |
| CN112011127A (en) * | 2020-09-10 | 2020-12-01 | 无锡会通轻质材料股份有限公司 | Polypropylene expanded beads with different cell sizes and selectively distributed cells and preparation method thereof |
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