CN109988362B - Micro-foaming polypropylene material and preparation method thereof - Google Patents
Micro-foaming polypropylene material and preparation method thereof Download PDFInfo
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—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 chemical blowing agent
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- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—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 chemical blowing agent
- C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—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 chemical blowing agent
- C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—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 chemical blowing agent
- C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—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 chemical blowing agent
- C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/108—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond in a heterocyclic ring containing at least one carbon atom
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/18—Binary blends of expanding agents
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
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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
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
Abstract
The invention relates to the field of macromolecules, in particular to a micro-foaming polypropylene material and a preparation method thereof. The invention provides a micro-foaming polypropylene material which has low density, high foaming ratio, uniform pore diameter of pores, no trace on the surface and excellent appearance, and is mainly concentrated in the material, and a preparation method of the micro-foaming polypropylene material. The foaming agent composite powder with the particle size distribution D50 value of 1-10 microns is prepared by matrix particles and a composite foaming agent, the foaming agent is uniformly loaded on the matrix particles, and the foaming agent composite powder and polypropylene resin are mixed, extruded, granulated and injected to prepare the micro-foaming polypropylene material. Compared with the traditional micro-foaming mode, the invention has lower cost and less requirement on special equipment, and can keep the excellent characteristics of the pure polypropylene to the greatest extent.
Description
Technical Field
The invention relates to the field of macromolecules, in particular to a micro-foaming polypropylene material and a preparation method thereof.
Background
Compared with common plastics, the foaming resin has the advantages of low density, good heat-gathering performance, high thermal stability, good mechanical properties such as impact strength, toughness, fatigue resistance and the like, and has a plurality of applications in packaging materials, automobile parts, adsorbents, mechanical supporting equipment and the like. Among them, polypropylene is widely used in the foaming resin industry due to its low cost, high melting point, high tensile modulus, low density, and good chemical stability. According to the difference of the foaming aperture size, the foaming polypropylene can be divided into common foaming PP and micro foaming PP. Ordinary foamed polypropylene usually has cells visible to the naked eye, and the diameter of the cells is more than 100 microns, so that the foamed polypropylene can be used for preparing packaging materials. When the diameter of the cells is less than 100 microns, the polypropylene is called micro-foamed polypropylene and can be used for part of injection molding accessories of a vehicle body, so that the weight of the vehicle body is effectively reduced. However, the preparation of micro-foaming polypropylene has two major difficulties, the first is the control of the foaming size, because the melt strength of polypropylene is lower compared with materials such as polyurethane, polystyrene and the like, the foaming molding is very difficult, the problems of fusion and rupture of bubbles and the like are easy to occur, and the large bubbles with irregular distribution are generated, the second is that the uniformity of the foaming size is difficult to control, besides the influence of the melt strength of polypropylene, the uniformity control of the foaming size of polypropylene is difficult to control mainly for 2 reasons, namely, polypropylene is a semi-crystalline polymer, the internal physical structure of the whole polymer is not uniform in the process of forming spherulite, so that the problem of the foaming uniformity is generated, and the second is that the mixing of a foaming agent, a micro-bubble nucleating agent and polypropylene resin is not uniform enough, so that the foaming size is different. The mixing of the foaming agent, the micro-bubble nucleating agent and the polypropylene resin also has two problems, one is the agglomeration of the foaming agent, and the other is the mixing of inorganic particles such as the foaming agent, the micro-bubble nucleating agent and the like and the polypropylene resin.
At present, aiming at the problems of difficult foam molding and poor uniformity of foam size distribution above the melting point of polypropylene, the main technical route is to improve the melt strength of polypropylene, modify the polarity of polypropylene or prepare polypropylene by adopting a physical supercritical foaming method. In order to improve the melt strength of polypropylene, the first common way is to use high melt strength polypropylene HMSPP, such as new catalyst or reactor introduction of small amount of long chain branched polypropylene, but usually the preparation cost is high; the second way is why other polyolefins with high melt strength (such as polyethylene) are blended, but the addition of other polyolefins can reduce the advantages of the polypropylene such as heat resistance and good mechanical properties; the third way is to introduce a certain crosslinking structure, such as crosslinking a part of polypropylene by radiation crosslinking or chemical crosslinking agent, but the control of the crosslinking degree is difficult, chemical residues are easy to exist, the preparation process is difficult to control, and even a certain explosion risk may exist. In order to improve the mixing of polypropylene and inorganic filler, the common way is to modify polypropylene with maleic anhydride to improve its compatibility with inorganic filler, but maleic anhydride is costly and not ideal for controlling cell size. In addition, the physical supercritical foaming method is used for preparing the microbubbles by utilizing a polymer-gas homogeneous system existing in a supercritical fluid form and rapidly changing the solubility of gas in the polymer in a temperature rapid changing manner, but the supercritical fluid foaming method generally needs special equipment, has complex process, is difficult to control the product quality and has higher cost.
Based on the above, the invention provides a material process which can be used for common melt strength polypropylene resin, can realize polypropylene micro-foaming without adopting special supercritical fluid equipment, has good foaming uniformity and no agglomeration of a foaming agent, and can effectively control the cost.
Disclosure of Invention
The invention aims to provide a micro-foaming polypropylene material which has low density, high foaming multiplying power, uniform pore diameter of cells, no trace on the surface and excellent appearance, is mainly concentrated in the material and a preparation method of the micro-foaming polypropylene material.
The foaming agent composite powder with the particle size distribution D50 value of 1-10 microns is prepared by matrix particles and a composite foaming agent, the foaming agent is uniformly loaded on the matrix particles, and the foaming agent composite powder and polypropylene resin are mixed, extruded, granulated and injected to prepare the micro-foaming polypropylene material. The prepared micro-foaming polypropylene has a flat surface without leaving marks, and a composite micro-bubble structure formed by micro-bubbles with uniform pore diameters and an average size of 50-250 micrometers and micro-bubbles with the pore diameter smaller than 10 micrometers or a super-micro-bubble structure of the micro-bubbles with the pore diameter smaller than 20 micrometers exists in the micro-foaming polypropylene. The density of the material is 0.8-0.95g/cm 3 Melt flow rate of 2.5-50g/10min, tensile strength>8Mpa, elongation at break higher than 500%, notched impact strength of cantilever beam>5kJ/m 2 . Compared with the traditional preparation process of the micro-foaming polypropylene, the preparation method disclosed by the invention has the advantages that the novel composite foaming powder is prepared, special supercritical fluid equipment is not needed, the control on the pore size and the uniformity of the micro-foaming of the polypropylene can be realized by using common melt strength polypropylene resin, and the problem of foaming agent agglomeration is solved.
The invention provides a micro-foaming polypropylene material, which comprises 50-99.5 wt% of polypropylene resin and 0.5-50 wt% of foaming agent composite powder with the particle size distribution D50 value of 1-10 microns, wherein the foaming agent composite powder comprises the following components in percentage by mass: 10-95% of matrix particles, 5-90% of composite foaming agent and 0-10% of foaming agent auxiliary agent.
Wherein the matrix particles include, but are not limited to: one or more of wood flour, diatomite, fly ash, dolomite, calcium carbonate, calcium silicate, glass beads, titanium dioxide, sepiolite, attapulgite, zeolite, quartz, kaolin, silicon dioxide, bentonite or perlite.
The composite foaming agent comprises 50-100 wt% of a first-phase foaming agent and 0-50 wt% of a second-phase foaming agent, wherein the first-phase foaming agent is one or more of p-toluenesulfonyl semicarbazide, azodicarbonamide, barium azodicarboxylate or 5-phenyl tetrazole, and the second-phase foaming agent is one or more of bicarbonate, such as sodium bicarbonate, calcium bicarbonate or calcium bicarbonate.
The foaming agent auxiliary agent is one or more of sodium bicarbonate, sodium citrate, urea, lactic acid and malic acid.
The invention provides a preparation method of a micro-foaming polypropylene material, which comprises the steps of firstly preparing foaming agent composite powder, mixing 10-95 wt% of matrix particles, 5-90 wt% of composite foaming agent and 0-10 wt% of foaming agent auxiliary agent; then mixing 50-99.5 wt% of polypropylene resin and 0.5-50 wt% of foaming agent composite powder, and carrying out extrusion granulation to obtain modified polypropylene granules; finally, the modified polypropylene granules are sent into an injection molding machine, injection molding is carried out at the injection molding temperature of 210-250 ℃, and the polypropylene micro-foaming material is prepared.
Wherein the raw material polypropylene resin is polypropylene resin particles with the melt flow rate of 2-45g/10 min.
Wherein the granulation is melt extrusion granulation through a double-screw extruder, and the extrusion temperature is 140-180 ℃ to obtain the modified polypropylene granules.
Wherein the matrix particles include, but are not limited to: one or more of wood flour, diatomite, fly ash, dolomite, calcium carbonate, calcium silicate, glass beads, titanium dioxide, sepiolite, attapulgite, zeolite, quartz, kaolin, silicon dioxide, bentonite or perlite.
The composite foaming agent comprises 50-100 wt% of a first-phase foaming agent and 0-50 wt% of a second-phase foaming agent, wherein the first-phase foaming agent is one or more of p-toluenesulfonyl semicarbazide, azodicarbonamide, barium azodicarboxylate and 5-phenyl tetrazole, and the second-phase foaming agent is bicarbonate, such as one or more of sodium bicarbonate, calcium bicarbonate and calcium bicarbonate.
Wherein the foaming agent auxiliary agent is one or more of sodium bicarbonate, sodium citrate, urea, lactic acid and malic acid.
The foaming agent composite powder is prepared by one or more of a high-speed mixing stirrer, a vibration mill, a sand mill, an air flow mill, a stirring mill, a honeycomb mill, a Raymond mill, a ring roller mill, a universal impact mill, a high-speed impact type air flow crusher and a wet or dry ball mill in a mixing mode, the prepared foaming agent composite powder is coated on matrix particles by a composite foaming agent, and the particle size distribution D50 value is 1-10 microns.
The prepared micro-foamed polypropylene has a flat and traceless surface, and a composite micro-bubble structure formed by micro-bubbles with uniform pore diameters and an average size of 50-250 micrometers and micro-bubbles with pore diameters smaller than 10 micrometers exists in the micro-foamed polypropylene, and an exemplary figure is shown as figure 1, or a super-micro-bubble structure of the micro-bubbles with pore diameters smaller than 20 micrometers is shown as figure 2.
By loading the composite foaming agent on the matrix particles in advance, the problem of agglomeration of the traditional foaming agent powder can be effectively avoided, the effective dispersibility and the foaming size uniformity of the foaming agent in polypropylene can be controlled, and the irregular large-size distribution caused by fusion and breakage of bubbles can be avoided. Furthermore, the pore diameter of the material can be adjusted by adjusting the parameters of the components, the component mass fraction, the particle size distribution and the like of the foaming agent composite powder. The density of the prepared material is 0.8-0.95g/cm 3 The melt flow rate is 2.5-50g/10min, and the alloy has good mechanical properties and tensile strength>8Mpa, elongation at break higher than 500%, notched impact strength of cantilever beam>5kJ/m 2 . Compared with traditional micro hairCompared with the bubble method, the invention has lower cost and less requirement on special equipment, and can retain the excellent characteristics of the pure polypropylene to the greatest extent.
Drawings
FIG. 1 is a scanning electron microscope image of a composite microbubble structure fracture prepared by the invention;
FIG. 2 is a scanning electron microscope image of the fracture of the ultramicro-bubble structure prepared by the invention;
FIG. 3 is a scanning electron micrograph of a comparative example.
Detailed Description
Comparative example
Carrying out extrusion granulation on polypropylene resin with melt flow rate of 38g/min and pure azodicarbonamide according to the mass ratio of 10:1 at the maximum temperature of 180 ℃, and carrying out injection molding at the maximum temperature of 230 ℃ to obtain a product with the density of 0.88g/cm 3 Macro large bubbles with the pore diameter of more than 500 microns appear in part of places, no bubbles exist in part of places, ultra-micro bubbles with the pore diameter of less than 10 microns do not appear in parts of places, the mechanical property of the material is seriously influenced, and the impact strength of a cantilever beam notch is seriously influenced<4kJ/m 2 The cell microstructure is shown in FIG. 3.
Example 1
Compounding 95 mass percent of talcum powder and 5 mass percent of composite foaming agent by using a high-speed impact type jet mill to prepare foaming agent composite powder, wherein the composite foaming agent selects a first-phase foaming agent azodicarbonamide and a second-phase foaming agent sodium bicarbonate, and the particle size distribution D50 value of the prepared foaming agent composite powder is 8.5 microns. Carrying out extrusion granulation on polypropylene resin with the melt flow rate of 2.5 and the modified foaming agent composite powder according to the mass ratio of 10:1 at the highest temperature of 180 ℃, and carrying out injection molding at the highest temperature of 230 ℃ to obtain the product with the density of 0.88g/cm 3 . The prepared sample has a smooth surface without leaving marks, a composite microbubble structure formed by microbubbles with uniform pore diameters and average sizes of 150 microns and microbubbles with pore diameters smaller than 10 microns exists in the sample, the melt flow speed of the material is 2.5-50g/10min, the tensile strength is 8.1Mpa, the elongation at break is higher than 500%, and the notch impact strength of a cantilever beam is 6kJ/m 2 . The microstructure of the cells is shown in figure 1, the cell structure of the material is mainly in the material, a micropore structure with the average pore diameter of 150-200 microns and with the uniformly distributed bubble pore diameter exists on the order of 100 microns, and micropores with the average pore diameter of 2 microns and with the uniformly distributed pore diameter exist on the order of 1 micron.
Example 2
Carrying out extrusion granulation on the polypropylene resin with the melt flow rate of 20 and the foaming agent composite powder in the embodiment 1 according to the mass ratio of 10:1 at the highest temperature of 180 ℃, and carrying out injection molding at the highest temperature of 230 ℃ to obtain the product with the density of 0.91g/cm 3 。
Example 3
Carrying out extrusion granulation on the polypropylene resin with the melt flow rate of 20 and the foaming agent composite powder in the embodiment 1 according to the mass ratio of 10:1 at the highest temperature of 180 ℃, and carrying out injection molding at the highest temperature of 230 ℃ to obtain the product with the density of 0.92g/cm 3 。
Example 4
The polypropylene resin with the melt flow rate of 38 and the foaming agent composite powder in the embodiment 1 are extruded and granulated at the maximum temperature of 180 ℃ according to the mass ratio of 10:1, and injection molding is carried out at the maximum temperature of 230 ℃ to obtain the product with the density of 0.94g/cm 3 。
Example 5
Compounding 95 mass percent of talcum powder and 5 mass percent of composite foaming agent by using a high-speed impact type jet mill to prepare foaming agent composite powder, wherein the composite foaming agent selects a first-phase foaming agent tosylsemicarbazide and a second-phase foaming agent sodium bicarbonate, and the particle size distribution D50 value of the prepared foaming agent composite powder is 8.5 microns. Carrying out extrusion granulation on polypropylene resin with the melt flow rate of 2.5 and foaming agent composite powder according to the mass ratio of 10:1 at the highest temperature of 180 ℃, and carrying out injection molding at the highest temperature of 230 ℃ to obtain the product with the density of 0.92g/cm 3 . The cell microstructure is shown in figure 2.
Example 6
The polypropylene resin with the melt flow rate of 20 and the foaming agent composite powder in the embodiment 5 are extruded and granulated at the highest temperature of 180 ℃ according to the mass ratio of 10:1, and injection molding is carried out at the highest temperature of 230 ℃ to obtain the product with the density of 0.94g/cm 3 。
Example 7
Compounding 95 mass percent of talcum powder and 5 mass percent of composite foaming agent by using a high-speed impact type jet mill to prepare foaming agent composite powder, wherein the composite foaming agent selects a first-phase foaming agent barium azodicarboxylate and a second-phase foaming agent sodium bicarbonate, and the particle size distribution D50 value of the prepared foaming agent composite powder is 8.5 microns. Carrying out extrusion granulation on polypropylene resin with the melt flow rate of 2.5 and foaming agent composite powder according to the mass ratio of 10:1 at the highest temperature of 180 ℃, and carrying out injection molding at the highest temperature of 230 ℃ to obtain a product with the density of 0.85g/cm 3 。
Example 8
The polypropylene resin with the melt flow rate of 20 and the foaming agent composite powder in the embodiment 7 are extruded and granulated at the highest temperature of 180 ℃ according to the mass ratio of 10:1, and injection molding is carried out at the highest temperature of 230 ℃ to obtain the product with the density of 0.92g/cm 3 。
Example 9
Compounding 95 mass percent of talcum powder and 5 mass percent of composite foaming agent by using a high-speed impact type jet mill to prepare foaming agent composite powder, wherein the composite foaming agent selects a first-phase foaming agent which is 5-phenyltetrazole and a second-phase foaming agent which is sodium bicarbonate, and the particle size distribution D50 value of the prepared foaming agent composite powder is 8.5 microns. Carrying out extrusion granulation on polypropylene resin with the melt flow rate of 2.5 and foaming agent composite powder according to the mass ratio of 10:1 at the highest temperature of 180 ℃, and carrying out injection molding at the highest temperature of 230 ℃ to obtain a product with the density of 0.84g/cm 3 。
Example 10
The polypropylene resin with the melt flow rate of 20 and the foaming agent composite powder in the embodiment 9 are mixed according to the mass ratio of 10:1Extruding and granulating at the maximum temperature of 180 ℃, and performing injection molding at the maximum temperature of 230 ℃ to obtain the product with the density of 0.90g/cm 3 。
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (11)
1. A micro-foamed polypropylene material, characterized in that: the surface is flat and has no trace, and a composite micro-bubble structure formed by micro-bubbles with uniform aperture and average size of 50-250 microns and micro-bubbles with aperture smaller than 10 microns or a super-micro-bubble structure formed by micro-bubbles with uniform aperture and average size smaller than 20 microns exists in the inner part of the micro-bubble structure; the density of the material is 0.8-0.95g/cm 3 Melt flow rate of 2.5-50g/10min, tensile strength>8MPa, elongation at break higher than 500%, and notched impact strength of cantilever beam>5kJ/m 2 ；
The micro-foaming polypropylene material comprises 50-99.5 wt% of polypropylene resin and 0.5-50 wt% of foaming agent composite powder with the particle size distribution D50 value of 1-10 microns, wherein the foaming agent composite powder comprises the following components in percentage by mass: 10-95% of matrix particles, 5-90% of composite foaming agent and 0-10% of foaming agent auxiliary agent;
the matrix particles are one or more of wood powder, diatomite, fly ash, dolomite, calcium carbonate, calcium silicate, glass beads, titanium dioxide, sepiolite, attapulgite, zeolite, quartz, kaolin, silicon dioxide, bentonite or perlite.
2. A micro-foamed polypropylene material according to claim 1, wherein: the composite foaming agent comprises 50-100 wt% of a first-phase foaming agent and 0-50 wt% of a second-phase foaming agent, wherein the first-phase foaming agent is one or more of p-toluenesulfonyl semicarbazide, azodicarbonamide, barium azodicarboxylate or 5-phenyltetrazole, and the second-phase foaming agent is bicarbonate.
3. A micro-expanded polypropylene material according to claim 2, wherein: the bicarbonate is one or two of sodium bicarbonate or calcium bicarbonate.
4. A micro-expanded polypropylene material according to claim 1, wherein: the foaming agent auxiliary agent is one or more of sodium bicarbonate, sodium citrate, urea, lactic acid or malic acid.
5. The method for preparing a micro-foamed polypropylene material according to claim 1, wherein the method comprises the following steps: firstly, preparing foaming agent composite powder, and mixing 10-95 wt% of matrix particles, 5-90 wt% of composite foaming agent and 0-10 wt% of foaming agent auxiliary agent; then mixing 50-99.5 wt% of polypropylene resin and 0.5-50 wt% of foaming agent composite powder, and carrying out extrusion granulation to obtain modified polypropylene granules; finally, the modified polypropylene granules are sent into an injection molding machine, injection molding is carried out at the injection molding temperature of 210-250 ℃, and the polypropylene micro-foaming material is prepared.
6. The method for preparing a micro-foamed polypropylene material according to claim 5, wherein the method comprises the following steps: the raw material polypropylene resin is polypropylene resin particles with the melt flow rate of 2-45g/10 min.
7. The method for preparing a micro-expanded polypropylene material according to claim 5, wherein: and the granulation is to perform melt extrusion granulation through a double-screw extruder, wherein the extrusion temperature is 140-180 ℃, and the modified polypropylene granules are obtained.
8. The method for preparing a micro-expanded polypropylene material according to claim 5, wherein: the composite foaming agent comprises 50-100 wt% of a first-phase foaming agent and 0-50 wt% of a second-phase foaming agent, wherein the first-phase foaming agent is one or more of p-toluenesulfonyl semicarbazide, azodicarbonamide, barium azodicarboxylate or 5-phenyltetrazole, and the second-phase foaming agent is bicarbonate.
9. The method for preparing a micro-foamed polypropylene material according to claim 5, wherein the method comprises the following steps: the foaming agent auxiliary agent is one or more of sodium bicarbonate, sodium citrate, urea, lactic acid or malic acid.
10. The method for preparing a micro-expanded polypropylene material according to claim 8, wherein: the bicarbonate is one or two of sodium bicarbonate or calcium bicarbonate.
11. The method for preparing a micro-foamed polypropylene material according to claim 5, wherein the method comprises the following steps: the foaming agent composite powder is prepared by one or more of a high-speed mixing stirrer, a vibration mill, a sand mill, a jet mill, a stirring mill, a honeycomb mill, a Raymond mill, a ring roller mill, a universal impact mill, a high-speed impact jet mill and a wet or dry ball mill in a mixing mode, the prepared foaming agent composite powder is coated on matrix particles by a composite foaming agent, and the particle size distribution D50 value is 1-10 micrometers.
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| CN111592703B (en) * | 2020-05-18 | 2022-08-16 | 广德祥源新材科技有限公司 | Environment-friendly cross-linked polyolefin foam material and preparation method thereof |
| CN112063029A (en) * | 2020-09-01 | 2020-12-11 | 广东工业大学 | Micro-foaming polyethylene wood-plastic composite material and preparation method thereof |
| CN112080069A (en) * | 2020-09-01 | 2020-12-15 | 广东工业大学 | Foamed polypropylene wood-plastic material and preparation method thereof |
| CN112608555B (en) * | 2020-12-14 | 2022-05-10 | 金发科技股份有限公司 | Foaming agent master batch and preparation method thereof |
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