CN112210113B - Polypropylene foaming material and preparation method thereof - Google Patents
Polypropylene foaming material and preparation method thereof Download PDFInfo
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- C08J9/14—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 organic
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- C08J2203/06—CO2, N2 or noble gases
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- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
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- 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
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Abstract
The invention discloses a polypropylene foam material and a preparation method thereof. The preparation method comprises the following steps: blending polypropylene with polydimethylsiloxane in CO 2 Foaming under the condition, wherein a micromolecular co-foaming agent is added in the foaming process, the micromolecular co-foaming agent is selected from any one of n-pentane, acetone and water, and the foaming temperature is 146-165 ℃; the addition amount of the micromolecular CO-foaming agent is CO 2 4-6 wt% of the mass. The preparation method of the polypropylene foam material provided by the invention has the advantages that the process is simple, the upper limit of the foaming temperature of polypropylene is widened, the polypropylene can be foamed at a higher temperature, and meanwhile, the prepared polypropylene foam material has the advantages of high foaming ratio, smaller pore diameter and large cell density.
Description
Technical Field
The invention relates to the field of polymer foaming, and particularly relates to a polypropylene foaming material and a preparation method thereof.
Background
Polypropylene (PP) is a thermoplastic resin, belonging to a semi-crystalline polymer, with high crystallinity and outstanding physical and mechanical properties, and has better yield strength and elastic modulus than foamed materials such as Polyethylene (PE) and Polystyrene (PS). Due to these excellent characteristics, polypropylene foam materials are widely used in the fields of electronic product packaging, sound insulation and heat insulation, and the like. However, the high crystallinity and linear molecular structure of polypropylene cause the melt strength of the polypropylene to be lower, so that the processing temperature range is narrow and is only 4 ℃, and when the foaming temperature is too high relative to the melting point, the melt strength of the polypropylene material is too low to foam, so that the foaming process has the problems of high requirements on equipment, difficult processing of foaming process conditions, high foaming difficulty and the like. Therefore, it is necessary to develop a method for preparing a polypropylene foam material, which widens the foaming temperature interval (i.e., the temperature interval in which polypropylene can be foamed).
Disclosure of Invention
The invention aims to overcome the defects that in the polypropylene foaming process in the prior art, the polypropylene foaming temperature range is narrow, foaming cannot be carried out at high temperature and the requirement on equipment is high due to low melt strength of polypropylene, and provides a polypropylene foaming material and a preparation method thereof. The preparation method of the polypropylene foaming material provided by the invention has simple process, widens the upper limit of the foaming temperature of the polypropylene and enables the polypropylene to be foamed at higher temperature. In addition, the polypropylene foam material prepared by the method has the advantages of high foaming ratio, small pore diameter and high cell density.
The invention solves the technical problems through the following technical scheme:
a preparation method of a polypropylene foaming material comprises the following steps: blending polypropylene with Polydimethylsiloxane (PDMS) to obtain polypropylene/PDMS blend, and adding into CO 2 Foaming under the condition, wherein a micromolecular co-foaming agent is added in the foaming process, the micromolecular co-foaming agent is selected from any one of n-pentane, acetone and water, and the foaming temperature is 146-165 ℃; the addition amount of the micromolecular CO-foaming agent is CO 2 4-6 wt% of the mass.
In the present invention, the CO is 2 By mass is meant in CO 2 CO added under foaming temperature and pressure at foaming 2 Of added CO 2 Filling the entire reaction vessel. The reaction vessel may be a reaction vessel conventional in the art for preparing foamed materials, such as an autoclave, among others.
In the present invention, the polypropylene may be polypropylene conventional in the art, such as polypropylene available from petrochemical and marine refining corporation of china, model E02ES. The molecular weight of the polypropylene is preferably 400000 to 600000g/mol. The polypropylene may also be tableted into sheets prior to the blending as is conventional in the art.
In the present invention, the number average molecular weight of the polydimethylsiloxane is preferably 3500 to 4500g/mol, for example 4000g/mol.
In the present invention, the mass ratio of the polypropylene to the polydimethylsiloxane is preferably (90-110): 1, for example, 100.
In the present invention, the temperature of the blending is preferably 160 to 200 ℃, for example 170, 180 or 190 ℃.
The time for said blending is preferably 20 to 30min, for example 25 or 28min.
The blending may be carried out in a haake mixer as is conventional in the art. The blending torque rotation speed may be that conventional in the art, preferably 80 to 100rpm.
In the present invention, the foaming temperature is preferably 156 to 165 ℃, for example 156, 160, 162 or 165 ℃.
In the present invention, the small molecule CO-blowing agent is preferably added in an amount of CO 2 5wt% of the mass.
In the present invention, the pressure of the foaming is preferably 15 to 20MPa, for example 15, 18 or 20MPa.
In the present invention, the foaming preferably comprises the steps of: after the addition of the small molecule CO-blowing agent, CO is used 2 Blowing, heating to foaming temperature, maintaining temperature, and introducing high-pressure CO 2 The pressure was set to saturate the sheet. The saturation refers to CO 2 A dissolution diffusion equilibrium is reached in the sheet.
Wherein, the number of times of purging may be the number of times of purging conventional in the art, preferably three times. The purging serves to remove air.
The heating rate may be a heating rate conventional in the art, preferably a constant rate, and more preferably 5 to 10 ℃/min, such as 7, 9, or 10 ℃/min.
The holding time may be a holding time conventional in the art, and is preferably 20 to 60min, for example 30, 40 or 50min.
Wherein the saturation time is preferably 1 to 2h, such as 1.5h.
Wherein, after saturating the sheet, the following steps can be further included according to the routine in the field: pressure relief; and (6) cooling and shaping.
Wherein the pressure relief operation may be a conventional pressure relief operation in the art, preferably a rapid pressure relief, for example, to release high pressure CO within 1s 2 And (4) discharging. Wherein the pressure relief rate is preferably 300 to 700MPa/s, more preferably 400 to 600MPa/s, for example 500MPa/s.
In a preferred embodiment of the present invention, the preparation method of the polypropylene foam material comprises the following steps:
(1) Blending: mixing a polypropylene raw material and polydimethylsiloxane with the number average molecular weight of 4000g/mol according to the mass ratio of 100;
(2) Foaming: in CO 2 Foaming under the condition, adding small molecule CO-foaming agent acetone in the foaming process, wherein the addition amount is CO under the experimental temperature and pressure 2 5% by weight of the mass, with CO 2 Purging, heating to 156 deg.C, keeping the temperature for half an hour, and introducing high-pressure CO 2 Controlling the pressure to be 15MPa, leading the sheet to be saturated for 1.5h until the dissolution and diffusion are balanced, then quickly relieving the pressure, and leading high-pressure CO in the container to be in 1s 2 Discharging, cooling and shaping.
Furthermore, the invention also provides a polypropylene foam material, which is prepared by the preparation method of the polypropylene foam material.
In the present invention, the polypropylene foam material preferably has the following characteristics:
the cell density is 3.21X 10 9 ～3.95×10 10 cells/cm 3 For example, 3.38X 10 9 ～2.55×10 10 cells/cm 3 For another example: 3.38X 10 9 、5.51×10 9 、9.39×10 9 、1.25×10 10 Or 2.55X 10 10 cells/cm 3 ；
The cell expansion ratio is 12 to 25 times, for example 12.57, 15.65, 19.30, 19.64 or 21.16 times;
the average diameter of the cells is 9-50 μm; for example 11.16, 12.52, 41.21 or 43.53 μm.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
1) The foaming performance of polypropylene is improved by adding the nucleating agent Polydimethylsiloxane (PDMS) which is a CO-philic one 2 After the type additive and polypropylene are blended, the polypropylene foam material plays a role of a nucleating agent in a polypropylene foaming process, is uniformly dispersed in a matrix, provides nucleation sites for heterogeneous nucleation, promotes polypropylene crystallization nucleation, and improves the number of polypropylene crystal nuclei and the cell density of a foaming sample, thereby preparing the polypropylene foam material with better foaming performance.
2) The CO-foaming agent such as pentane, acetone, water and the like is used for assisting CO 2 Foaming, namely, increasing the upper limit of the polypropylene foaming temperature, so that the polypropylene can be foamed at a higher temperature, the defect that the requirement on the temperature control of equipment is too high due to too low melt strength of a polypropylene matrix is overcome, and the foam material with more excellent performance is obtained. Small molecular substance such as pentane, acetone and water and CO 2 Has good interaction and compatibility, and can improve CO 2 The solubility in a polypropylene matrix reduces the foaming pressure and promotes the nucleation of bubbles; in the pressure relief process, the small molecular substances such as pentane, acetone and water can also provide internal cooling for the foaming process, so that the potential thermal degradation of the matrix is reduced, the heat is uniformly distributed in the kettle, and the flexibility of the polymer chain improves the average strength of the plasticizing effect. Can also reduce CO 2 The saturation time in polypropylene improves the processing efficiency.
3) The preparation method provided by the invention can improve the upper limit of the foaming temperature of the polypropylene from 145 ℃ to 165 ℃, greatly broadens the upper limit of the foaming temperature and is beneficial to treatment in the process.
Drawings
FIG. 1 is a sectional electron microscope image of a polypropylene foamed product obtained in example 1 of the present invention;
FIG. 2 is a cross-sectional electron microscope image of a polypropylene foamed product obtained in example 2 of the present invention;
FIG. 3 is a sectional electron microscope image of a polypropylene foamed product obtained in example 3 of the present invention;
FIG. 4 is a sectional electron microscope image of a polypropylene foamed product obtained in example 4 of the present invention;
FIG. 5 is a sectional electron microscope image of a polypropylene foamed product obtained in example 5 of the present invention;
FIG. 6 is a sectional electron microscope image of a polypropylene foamed product obtained in comparative example 1 of the present invention;
FIG. 7 is a sectional electron microscope image of the polypropylene foamed product obtained in comparative example 2 of the present invention.
FIG. 8 is a sectional electron microscope image of a polypropylene foamed product obtained in comparative example 3 of the present invention.
FIG. 9 is a sectional electron microscope image of a polypropylene foamed product obtained in comparative example 4 of the present invention.
FIG. 10 is a sectional electron microscope image of a polypropylene foamed product obtained in comparative example 5 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
In the following examples and comparative examples, the polypropylene raw material was polypropylene flake raw material obtained by hot-pressing polypropylene particles into flakes using a hot press. The polypropylene foams were obtained by batch foaming in an autoclave by the following production methods in examples or comparative examples.
In the following examples, polypropylene is available from the petrochemical and marine refining company, china, product number E02ES.
Example 1
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave and the co-blowing agent n-pentane was added in an amount of (0.70 g, experimental temperature)CO under pressure 2 5% by weight of the mass) with CO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating to 156 deg.C at constant rate (10 deg.C/min), keeping the temperature for half an hour, and introducing high-pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid decompression is carried out, and the high-pressure CO in the container is introduced into the container within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 1 is a cross-sectional electron microscope image of the polypropylene foamed product.
Example 2
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave and CO-blowing agent acetone was added in an amount of (0.70 g, CO at experimental temperature and pressure) 2 5% by weight of the mass) with CO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating to 156 deg.C at constant rate (10 deg.C/min), keeping the temperature for half an hour, and introducing high-pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid pressure relief is carried out, and the high-pressure CO in the container is discharged within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 2 is a cross-sectional electron micrograph of the resulting polypropylene foamed product.
Example 3
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque rotation speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave and CO-blowing agent water was added in an amount of (0.65 g, CO at experimental temperature and pressure) 2 5% by weight) of the mass, withCO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating to 165 deg.C at constant rate (10 deg.C/min), maintaining the temperature for half an hour, and introducing high-pressure CO 2 (13.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid pressure relief is carried out, and the high-pressure CO in the container is discharged within 1s 2 Discharging, and placing the high-pressure kettle into ice water bath for cooling and shaping to obtain the microporous foaming material. FIG. 3 is a sectional electron micrograph of the resulting polypropylene foamed product.
Example 4
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave and CO-blowing agent acetone was added in an amount of (0.42 g, CO at experimental temperature and pressure) 2 5% by weight of the mass) with CO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating to 156 deg.C at constant rate (10 deg.C/min), keeping the temperature for half an hour, and introducing high-pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid pressure relief is carried out, and the high-pressure CO in the container is discharged within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 4 is a sectional electron micrograph of the resulting polypropylene foamed product.
Example 5
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque rotation speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave and CO-blowing agent acetone was added in an amount of (0.84 g, CO at experimental temperature and pressure) 2 5% by weight of the mass) with CO 2 Purging three times to removeAir in the kettle, then placing the high-pressure kettle in an oil bath kettle, heating to 156 ℃ at a constant speed (10 ℃/min), preserving the temperature for half an hour, and then filling high-pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid pressure relief is carried out, and the high-pressure CO in the container is discharged within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 5 is a sectional electron micrograph of the resulting polypropylene foamed product.
Comparative example 1
Polypropylene material (0.20 g) was placed in an autoclave and charged with CO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating at constant rate (10 deg.C/min) to 145 deg.C (the temperature is the optimal foaming temperature of polypropylene), keeping the temperature for half an hour, and introducing high-pressure CO 2 (15.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid pressure relief is carried out, and the high-pressure CO in the container is discharged within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 6 is a sectional electron micrograph of the resulting polypropylene foamed product.
Comparative example 2
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave with CO 2 Purging for three times, removing air in the kettle, placing the autoclave in an oil bath, heating to 156 deg.C at constant rate (10 deg.C/min), keeping the temperature for half an hour, and charging high pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid pressure relief is carried out, and the high-pressure CO in the container is discharged within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 7 is a sectional electron micrograph of the resulting polypropylene foamed product.
Comparative example 3
Mixing 50g of polypropylene raw material and 0.50g of polydimethylsiloxane (with the number average molecular weight of 4000 g/mol) according to the mass ratio of 100, then placing the mixture into a Haake mixer for blending, wherein the blending temperature is 180 ℃, the blending time is 20min, and the torque speed is 100rad/min, and blending to obtain the polypropylene/polydimethylsiloxane blend.
The blend was placed in an autoclave and CO-blowing agent acetone was added in an amount of 0.98g (i.e. CO under experimental temperature and pressure) 2 7% by weight of the mass) with CO 2 Purging for three times, removing air in the kettle, placing the autoclave in an oil bath, heating to 156 deg.C at constant rate (10 deg.C/min), keeping the temperature for half an hour, and charging high pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid decompression is carried out, and the high-pressure CO in the container is introduced into the container within 1s 2 Discharging, and placing the high-pressure kettle into ice water bath for cooling and shaping to obtain the microporous foaming material. FIG. 8 is a sectional electron microscope image of the polypropylene foamed product.
Comparative example 4
Polypropylene material (0.20 g) was placed in an autoclave and charged with CO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating to 156 deg.C at constant rate, keeping the temperature for half an hour, and introducing high-pressure CO 2 (14.00 g) and the pressure is controlled to be 15MPa, so that the sheet is saturated for 1.5h until the dissolution and diffusion are balanced, then the rapid decompression is carried out, and the high-pressure CO in the container is introduced into the container within 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 9 is a sectional electron microscope image of the polypropylene foamed product.
Comparative example 5
Hot pressing polypropylene particles into sheets by a hot press, placing the sheet raw materials into an autoclave, and using CO 2 Purging for three times to remove air in the kettle, placing the autoclave in an oil bath kettle, heating to 165 ℃ at constant rate, keeping the temperature for half an hour, and introducing high-pressure CO 2 Controlling the pressure to be 15MPa, leading the sheet to be saturated for 1.5h until the sheet is dissolved, diffused and balanced, then quickly relieving pressure, and leading high-pressure CO in the container to be in 1s 2 Discharging, and putting the autoclave into an ice water bath for cooling and shaping to obtain the microcellular foam material. FIG. 10 is the resultSection electron microscope picture of polypropylene foaming product.
TABLE 1
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (12)
1. The preparation method of the polypropylene foaming material is characterized by comprising the following steps: blending polypropylene with polydimethylsiloxane in CO 2 Foaming under the condition, wherein a micromolecular co-foaming agent is added in the foaming process, the micromolecular co-foaming agent is selected from any one of n-pentane, acetone and water, and the foaming temperature is 156-165 ℃; the addition amount of the micromolecular CO-foaming agent is CO 2 4-5 wt% of the mass;
the molecular weight of the polypropylene is 400000-600000 g/mol;
the number average molecular weight of the polydimethylsiloxane is 3500-4500 g/mol;
the mass ratio of the polypropylene to the polydimethylsiloxane is (90-110) to 1;
the foaming pressure is 15-20 MPa;
the polypropylene foam material has the following characteristics:
cell density of 3.21X 10 9 ～3.95×10 10 cells/cm 3 ；
The foaming multiplying power of the foam holes is 12 to 25 times;
the average cell diameter is 9 to 50 μm.
2. The method for producing a polypropylene foam according to claim 1,
sheeting the polypropylene into a sheet prior to said blending;
and/or the temperature of the blending is 160-200 ℃;
and/or the blending time is 20-30 min;
and/or, the blending is carried out in a haake mixer;
and/or the torque rotating speed of the blending is 80-100 rpm;
and/or the addition amount of the small-molecule CO-foaming agent is CO 2 5wt% of mass;
and/or the foaming pressure is 15-20 MPa.
3. The method for preparing polypropylene foam according to claim 2, wherein the polydimethylsiloxane has a number average molecular weight of 4000g/mol;
and/or the mass ratio of the polypropylene to the polydimethylsiloxane is 100;
and/or the temperature of the blending is 170, 180 or 190 ℃;
and/or the blending time is 25 or 28min;
and/or the foaming temperature is 156, 160, 162, or 165 ℃;
and/or the pressure of the foaming is 15, 18 or 20MPa.
4. The method for preparing polypropylene foam material according to claim 1, wherein the foaming comprises the following steps: after the addition of the small molecule CO-blowing agent, CO is used 2 Blowing, heating to foaming temperature, maintaining temperature, and introducing high-pressure CO 2 The pressure was set to saturate the sheet.
5. The method for producing a polypropylene foam according to claim 4, wherein the number of the purging is three;
and/or the rate of heating is a constant rate;
and/or the heat preservation time is 20-60 min;
and/or the saturation time is 1-2 h;
and/or, after saturating the sheet, further comprising the steps of: pressure relief; and (5) cooling and shaping.
6. The method for preparing polypropylene foam according to claim 5, wherein the heating rate is 5 to 10 ℃/min.
7. The method for preparing polypropylene foam according to claim 5, wherein the heating rate is 7, 9 or 10 ℃/min;
and/or the heat preservation time is 30, 40 or 50min;
and/or the saturation time is 1.5h;
and/or, after saturating the sheet, further comprising the steps of: pressure relief; and when the pressure is cooled and shaped, the pressure relief rate is 300-700 MPa/s.
8. The method for preparing polypropylene foam material according to claim 7, wherein the rate of pressure release is 400-600 MPa/s during cooling and setting.
9. The method for preparing polypropylene foam material according to claim 8, wherein the rate of pressure release is 500MPa/s when cooling and setting.
10. The method for preparing polypropylene foam according to claim 1, comprising the steps of:
(1) Blending: mixing a polypropylene raw material and polydimethylsiloxane with the number average molecular weight of 4000g/mol according to the mass ratio of 100;
(2) Foaming: in CO 2 Foaming under the condition that micromolecules are added in the foaming processCO-foaming agent acetone, the addition amount of which is CO under the experimental temperature and pressure 2 5% by weight of the mass, with CO 2 Purging, heating to 156 deg.C, maintaining for half an hour, and charging high pressure CO 2 Controlling the pressure to be 15MPa, leading the sheet to be saturated for 1.5h until the dissolution and diffusion are balanced, then quickly relieving the pressure, and leading high-pressure CO in the container to be in 1s 2 And discharging, cooling and shaping.
11. A polypropylene foam, characterized in that it is prepared by the method for preparing polypropylene foam according to any one of claims 1 to 10.
12. The polypropylene foam of claim 11, wherein the cell density is 3.38 x 10 9 、5.51×10 9 、9.39×10 9 、1.25×10 10 Or 2.55X 10 10 cells/cm 3 ；
The foaming ratio of the cells is 12.57, 15.65, 19.30, 19.64 or 21.16 times;
the average cell diameter was 11.16, 12.52, 41.21 or 43.53 μm.
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| US4550125A (en) * | 1985-03-25 | 1985-10-29 | Dow Corning Corporation | Foamable polyorganosiloxane compositions |
| DE10260815B4 (en) * | 2002-12-23 | 2008-07-03 | Universität Zu Köln | Foamed material and production process for the foamed material |
| CN101942055B (en) * | 2010-09-09 | 2012-06-27 | 浙江工业大学 | Random copolymer and application thereof to supercritical carbon dioxide (CO2) foaming |
| CN102924742B (en) * | 2011-08-12 | 2015-09-30 | 黑龙江鑫达企业集团有限公司 | Supercritical CO 2 legal system is for the method for expandable polypropylene resin particle |
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| CN111234385B (en) * | 2020-04-07 | 2022-12-23 | 福建安达福新材料科技有限公司 | Polypropylene foaming material based on supercritical carbon dioxide and preparation method thereof |
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