CN110183713B - Preparation method of polybutylene expanded beads (EPB) - Google Patents
Preparation method of polybutylene expanded beads (EPB) Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
- C08J9/12—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
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
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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
- C08J2323/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08J2323/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
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Abstract
The invention provides a preparation method of polybutylene expanded beads, which is characterized in that the expanded beads are prepared by adopting polybutylene alloy powder as base resin and adopting a physical foaming agent through an intermittent kettle type foaming method. The polybutylene alloy is synthesized by an in-kettle alloy technology, and other polyolefin components are introduced, so that the crystal form transformation speed, the impact resistance and the like of the polybutylene are effectively improved. The invention takes the polybutene alloy with high molecular weight and wide molecular weight distribution as the raw material, and the melt flow index (190 ℃, 2.16kg) is 0.1-2g/10 min. The polybutylene alloy has high melt strength and wide foaming temperature range, and can be used for preparing closed-cell foaming beads with uniform and compact foam holes and adjustable foam hole diameters by combining different auxiliaries. The prepared polybutylene alloy foamed bead (EPB) is a compression-resistant buffering heat-insulating material, has excellent high-strength anti-retraction property, shock absorption and energy absorption property, low temperature resistance and chemical corrosion resistance, is easy to mold, has the advantages of low cost, short period, controllable density and the like, and can be widely applied to the fields of war industry, automobiles, buildings, children toys, food packaging materials, household appliances and the like.
Description
Technical Field
The invention relates to the technical field of high polymer foaming materials, in particular to polybutylene foaming beads (EPB) and a preparation method thereof.
Technical Field
The foam is an aggregate formed by dispersing gas in a solid polymer, and has the advantages of light weight, heat insulation, buffering, insulation, corrosion resistance, low price and the like. Therefore, it is widely used in commodity, packaging, industrial, agricultural, transportation, military and aerospace industries. Compared with the traditional foam material, the non-crosslinked polyolefin foam material has excellent mechanical property and environmental protection property. Among them, polybutene among polyolefins has good low temperature resistance, creep resistance, corrosion resistance, good mechanical properties and mechanical strength, and the stress cracking resistance is the best as compared with other polyolefins. The polybutylene alloy is synthesized by an alloy technology in a kettle, and other polyolefin components are introduced, so that the crystal form transformation speed, the impact resistance and the like of the polybutylene are effectively improved. The polybutylene alloy has the characteristics of high molecular weight and wide molecular weight distribution, so that the polybutylene alloy has high melt strength and wide foaming temperature range, and closed-cell foaming beads with uniform and compact foam pores and adjustable foam pore diameters can be prepared by combining different processing functional auxiliaries.
The batch still foaming generally uses a physical foaming agent, and utilizes the pressure drop difference between the inside of the reaction vessel and the atmospheric pressure to produce expanded beads containing closed cell structures. The physical foaming agent is volatile hydrocarbon and CO2、N2And the like, chemical reaction can not occur in the reaction process, so that the reaction danger is greatly reduced, the environment can not be polluted, and the cost is low.
At present, the utilization rate of polybutene in China is low, and the polybutene is mainly applied to pipe wall materials of pipelines such as running water pipes, hot water pipes, heating pipes and the like. The polybutylene expanded beads (EPB) have high strength and high toughness, have good low temperature resistance and damping resilience, have no pollutants, organic volatile substances and pungent smell in the production process, and can meet the strict requirements of automobile interior decoration, food packaging and transportation, household appliances and indoor decoration on the smell. Meanwhile, the excellent low-temperature resistance of the EPB can ensure that the EPB still has excellent strength and toughness in an ultralow-temperature environment. Therefore, the polybutylene foam material (EPB) has wide development prospect.
In order to better utilize resources, expand the application field of polybutene, improve the utilization rate of polybutene and promote the development of foaming industry in China, the invention provides a method for preparing a polybutene foaming material with excellent performance by using polybutene alloy as a foaming base material.
Disclosure of Invention
Aiming at the problems of low utilization rate of the existing polybutene material, small application field and the like, the invention provides a polybutene alloy foam material and a preparation method thereof, and provides an environment-friendly high-performance polybutene foam material with simple production process on the premise of maintaining mechanical properties.
1 the invention relates to a preparation method of polybutylene expanded beads (EPB), which comprises the following specific formula: the composite material comprises the following raw materials in percentage by weight: polybutylene alloy powder is used as base resin, and the using amount is 80-95%; 3 to 7 percent of nucleating agent, 0.1 to 0.5 percent of antioxidant and 2 to 15 percent of processing aid.
The polybutene alloy powder of the present invention is one or more of 1-butene (butene in copolymer has molar content of 50-99%) and propylene in copolymer (propylene in copolymer has molar content of 0-15%), ethylene (ethylene in copolymer has molar content of 0-15%), 1-pentene (1-pentene in copolymer has molar content of 0-20%), 1-hexene (1-hexene in copolymer has molar content of 0-20%), 1-heptene (1-heptene in copolymer has molar content of 0-20%), 1-octene (1-octene in copolymer has molar content of 0-20%), 1-nonene (1-nonene in copolymer has molar content of 0-20%), 1-decene (1-decene in copolymer has molar content of 0-20%), the molecular weight distribution Mw/Mn of the copolymer is 2-20, and the melt flow index (190 ℃, 2.16Kg) is 0.1-2g/10 min.
3 the preparation method of the invention is an intermittent kettle type foaming method.
4 the physical foaming agent comprises volatile hydrocarbon and CO2、N2Wherein CO is preferred2。
5 the nucleating agent is a compound of a beta crystal nucleating agent and an alpha crystal nucleating agent. Wherein the beta crystal nucleating agent is one or a mixture of two or more of organic carboxylic acid and salts thereof (salts of dicarboxylic acid and IIA metal elements, particularly binary compounds of pimelic acid and calcium stearate), aromatic amide TMB series and rare earth complex WBG series. The alpha crystal nucleating agent is one or more of organic carboxylic acid and salts thereof, aromatic amides, inorganic nucleating agent with alpha crystal nucleating function, aromatic carboxylates of the alpha crystal nucleating agent, sorbitol of the alpha crystal nucleating agent and the like, and the using amount of the total nucleating agent is 0.001-3 parts. Preferably, the beta crystal nucleating agent is an aromatic amide TMB series or a rare earth complex WBG series, the alpha crystal nucleating agent is an inorganic nucleating agent with alpha crystal nucleating function, and further preferably, the total dosage of the nucleating agent is 0.01-2 parts.
6 the processing aid is one or more of an antioxidant, an antistatic agent, a flame retardant, color master batches and a coupling agent. The using amount of the auxiliary agent is 2-15 parts, preferably 5-12 parts.
7 the foaming nucleating agent is one or more of talcum powder, mica, glass beads, silicon dioxide, calcium carbonate, montmorillonite, kaolin, alumina, barium sulfate, zinc oxide, zinc stearate and calcium stearate; the antioxidant is one or more of antioxidants 168, 1010, 1076 and 626; the antistatic agent is one or more of alkyl imidazolines, quaternary phosphonium salts, quaternary sulfonium salts, quaternary ammonium salts, alkyl sulfonate salts or phosphates; the flame retardant is one or more of magnesium hydroxide, aluminum hydroxide, zinc borate and intumescent flame retardant DTPB; the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.
1) In the foaming nucleating agent, one or more of nano calcium carbonate, talcum powder, silicon dioxide and montmorillonite are preferred;
2) among the above antioxidants, 1010,168 is preferable;
3) among the antistatic agents, one or more of quaternary phosphonium salts, quaternary sulfur salts and quaternary ammonium salts are preferred;
4) among the flame retardants, one or more of magnesium hydroxide, aluminum hydroxide and zinc borate is preferred;
5) among the above coupling agents, a silane coupling agent is preferable.
The invention relates to a preparation method of polybutylene expanded beads (EPB), which comprises the following steps:
1) putting polybutylene alloy powder used in the experiment, a nucleating agent and a processing aid into a vacuum drying oven at 40-60 ℃ for drying for 18-48 h;
2) weighing the dried raw materials according to the proportion, wherein the raw materials comprise the following raw materials in percentage by weight: polybutylene alloy powder is used as base resin, and the using amount is 80-95%; 3 to 7 percent of nucleating agent, 0.1 to 0.5 percent of antioxidant, preferably 0.2 to 0.3 percent, and 2 to 15 percent of processing aid, preferably 5 to 12 percent. Placing the weighed raw materials into an automatic mixer, and stirring for 2-5 min;
3) adding the mixed materials into a double-screw extruder, wherein the double-screw extruder has six temperature intervals, and the temperature is set to be 120-160 ℃; after cooling, granulating and drying, obtaining modified polybutene particles with the length of 1-2mm and the diameter of 0.5-2 mm;
4) putting polybutene particles, a dispersing agent and deionized water into a high-pressure kettle, injecting a physical foaming agent into the high-pressure kettle under the stirring condition, simultaneously increasing the temperature of the high-pressure kettle to 110-;
5) the dispersant is one or more of kaolin, stearic acid, sodium dodecyl benzene sulfonate, quaternary ammonium compound, lecithin, amino acid, betaine, fatty glyceride and sorbitan fatty acid (sorbitan fatty acid ester). Preferably anionic surfactant sodium dodecyl benzene sulfonate and dispersant kaolin.
6) After the pressure maintaining time is over, releasing the pressure of the high-pressure kettle at a certain pressure releasing speed, and spraying the polybutylene beads into a cold water cooling system to obtain polybutylene expanded beads with the expansion ratio of 2-30 times; and (3) placing the primarily obtained polybutylene expanded beads in a secondary foaming device, controlling the pressure to be 0.1-1.5MPa in a steam atmosphere, maintaining the pressure for 10-60 s, and then releasing the pressure to further obtain the polybutylene expanded beads with higher foaming ratio, wherein the foaming ratio is 15-60 times.
7) And (3) drying the prepared polybutylene foam beads for 10-48 h in an environment at 30-60 ℃, injecting the dried polybutylene foam beads into steam compression molding equipment, and heating and cooling by steam to obtain a polybutylene foam bead molding body.
9 the pressure release rate of the autoclave of the invention is 0.3-2.0MPa/s, preferably 1.0-2.0 MPa/s. The cooling rate of the polybutene bead-water dispersion mixture is 10-25 deg.C/s.
10 compared with the prior art, the invention has the following advantages:
the polybutylene foaming material has high strength and high toughness, has good low temperature resistance, shock absorption resilience and good mechanical property, and has uniform bubble distribution. The physical foaming agent is used as the foaming agent, and no pollution gas is discharged in the production process. The prepared polybutylene foaming bead can realize cell regulation, the cell size is close to micron level, and the application of polybutylene materials is greatly expanded. CN 105670137A utilizes a chemical foaming agent to prepare a polybutylene foaming material through a mould pressing foaming method, the size of a foam hole is not easy to control, and environmental pollution is easy to cause. And at present, the polybutene is mainly applied to tubular materials such as hot water pipes and the like in China, the application field of the polybutene materials is small, the preparation method of the polybutene foaming beads developed by the invention widens the application field of the polybutene, promotes the development of the polybutene industry in China, and has good practical significance.
Detailed description of the invention
Example 1
1) 300g of experimental polybutene powder and 1g of inorganic nucleating agent talcum powder are placed in a vacuum drying oven at 50 ℃ and dried for 24 hours;
2) the auxiliary agent is uniformly mixed with the resin raw material and the nucleating agent by an automatic mixer according to the formula proportion by weight percentage to obtain the premix. Adding the premix into a double-screw extruder through a charging barrel, wherein the rotating speed of screws is 80r/min, and the temperatures of the premix are respectively 150 ℃, 160 ℃, 160 ℃, 160 ℃, 150 ℃ and 140 ℃ in sequence from a feeding port to a machine head in one to six zones. Extruding, water-cooling, bracing and granulating by using a double screw to obtain modified polybutene small particles with the length of 1.5mm and the diameter of 1.2 mm;
3) polybutene particles, a dispersant (kaolin), a surfactant (sodium dodecylbenzenesulfonate), and deionized water were put into an autoclave, and 1 part of kaolin, 0.75 part of a surfactant, and 200 parts of deionized water were added to 100 parts by weight of the polybutene particles. Injecting a physical foaming agent into the high-pressure kettle under the stirring condition, wherein the stirring speed is 700 r/min; simultaneously, the temperature of the high-pressure kettle is increased to 125 ℃, the pressure is increased to 7.5MPa, and after the set temperature and pressure are reached, the high-pressure kettle is kept for 30min, so that the foaming agent is permeated into the polybutene particles;
4) injecting the polybutene particle-high pressure water dispersion mixed material into a cold water cooling system at a pressure release speed of 1.0MPa/s in a high-pressure kettle, controlling the pressure of 0.3MPa in a secondary foaming device in a water vapor atmosphere, maintaining the pressure for 30s, releasing the pressure, and further obtaining the polybutene foamed beads with higher foaming ratio, wherein the foaming ratio is 22-30 times, the cell density is 0.03-0.04 g/cm3In the meantime.
5) And (3) drying the prepared polybutylene foamed beads for 12h in an environment at 60 ℃, injecting the dried polybutylene foamed beads into a steam compression molding device, heating by steam, and cooling to obtain a polybutylene foamed bead molded body.
Example 2
1) 300g of experimental polybutene powder and 1g of inorganic nucleating agent montmorillonite are placed in a vacuum drying oven at 50 ℃ and dried for 24 hours;
2) the auxiliary agent is uniformly mixed with the resin raw material and the nucleating agent by an automatic mixer according to the formula proportion by weight percentage to obtain the premix. Adding the premix into a double-screw extruder through a charging barrel, wherein the rotating speed of screws is 80r/min, and the temperatures of the premix are respectively 150 ℃, 160 ℃, 160 ℃, 160 ℃, 150 ℃ and 140 ℃ in sequence from a feeding port to a machine head in one to six zones. Extruding, water-cooling, bracing and granulating by using a double screw to obtain modified polybutene small particles with the length of 1.5mm and the diameter of 1.2 mm;
3) polybutene particles, a dispersant (kaolin), a surfactant (sodium dodecylbenzenesulfonate), and deionized water were put into an autoclave, and 1 part of kaolin, 0.75 part of a surfactant, and 200 parts of deionized water were added to 100 parts by weight of the polybutene particles. Injecting a physical foaming agent into the high-pressure kettle under the stirring condition, wherein the stirring speed is 700 r/min; simultaneously, the temperature of the high-pressure kettle is increased to 125 ℃, the pressure is increased to 7.5MPa, and after the set temperature and pressure are reached, the high-pressure kettle is kept for 20min, so that the foaming agent is permeated into the polybutene particles;
4) injecting the polybutene particle-high pressure water dispersed mixed material into a cold water cooling system at a pressure release speed of 2.0MPa/s in a high-pressure kettle, controlling the pressure of 0.3MPa in a secondary foaming device in a water vapor atmosphere, maintaining the pressure for 30s, releasing the pressure, and further obtaining the polybutene foamed beads with higher foaming ratio, wherein the foaming ratio is 25-30 times, the cell density is 0.03-0.035 g/cm3In the meantime.
5) And (3) drying the prepared polybutene foamed beads in an environment at 60 ℃ for 12 hours, injecting the dried polybutene foamed beads into steam compression molding equipment, and heating and cooling by using steam to obtain a polybutene foamed bead molded body.
Example 3
1) 300g of experimental polybutene powder and 2g of inorganic nucleating agent silicon dioxide are placed in a vacuum drying oven at 50 ℃ and dried for 24 hours;
2) the auxiliary agent is uniformly mixed with the resin raw material and the nucleating agent by an automatic mixer according to the formula proportion by weight percentage to obtain the premix. Adding the premix into a double-screw extruder through a charging barrel, wherein the rotating speed of screws is 100r/min, and the temperatures of the premix are respectively 150 ℃, 160 ℃, 160 ℃, 160 ℃, 150 ℃ and 140 ℃ in sequence from a feeding port to a machine head in one to six zones. Extruding, water-cooling, bracing and granulating by using a double screw to obtain modified polybutene small particles with the length of 1.5mm and the diameter of 1.2 mm;
3) polybutene particles, a dispersant (kaolin), a surfactant (sodium dodecylbenzenesulfonate), and deionized water were put into an autoclave, and 1.2 parts by weight of kaolin, 0.75 part by weight of a surfactant, and 200 parts by weight of deionized water were added to 100 parts by weight of the polybutene particles. Injecting a physical foaming agent into the high-pressure kettle under the stirring condition, wherein the stirring speed is 700 r/min; simultaneously, the temperature of the high-pressure kettle is increased to 128 ℃, the pressure is increased to 7.5MPa, and after the set temperature and pressure are reached, the high-pressure kettle is kept for 20min, so that the foaming agent is permeated into the polybutene particles;
4) injecting the polybutene particle-high pressure water dispersion mixed material into a cold water cooling system at a pressure release speed of 1.0MPa/s in a high-pressure kettle, controlling the pressure of 0.3MPa in a secondary foaming device in a water vapor atmosphere, maintaining the pressure for 30s, releasing the pressure, and further obtaining the polybutene foamed beads with higher foaming ratio, wherein the foaming ratio is 14-15 times, the cell density is 0.06-0.065 g/cm3In the meantime.
5) And (3) drying the prepared polybutylene foamed beads for 12h in an environment at 60 ℃, injecting the dried polybutylene foamed beads into a steam compression molding device, heating by steam, and cooling to obtain a polybutylene foamed bead molded body.
Example 4
1) 300g of experimental polybutene powder and 1g of inorganic nucleating agent nano calcium carbonate are placed in a vacuum drying oven at 50 ℃ and dried for 24 hours;
2) the auxiliary agent is uniformly mixed with the experimental raw materials and the nucleating agent by an automatic mixer according to the formula proportion by weight percentage to obtain the premix. Adding the premix into a double-screw extruder through a charging barrel, wherein the rotating speed of screws is 80r/min, and the temperatures of the premix are respectively 150 ℃, 160 ℃, 160 ℃, 160 ℃, 150 ℃ and 140 ℃ in sequence from a feeding port to a machine head in one to six zones. Extruding, water-cooling, bracing and granulating by using a double screw to obtain modified polybutene small particles with the length of 1.5mm and the diameter of 1.0 mm;
3) polybutene particles, a dispersant (kaolin), a surfactant (sodium dodecylbenzenesulfonate), and deionized water were put into an autoclave, and 1 part of kaolin, 0.75 part of a surfactant, and 200 parts of deionized water were added to 100 parts by weight of the polybutene particles. Injecting a physical foaming agent into the high-pressure kettle under the stirring condition, wherein the stirring speed is 700 r/min; simultaneously, the temperature of the high-pressure kettle is increased to 125 ℃, the pressure is increased to 10MPa, and after the set temperature and pressure are reached, the high-pressure kettle is kept for 30min, so that the foaming agent is permeated into the polybutene particles;
4) injecting the polybutene particle-high pressure water dispersed mixed material into a cold water cooling system at a pressure release speed of 2.0MPa/s in a high pressure kettle, controlling the pressure of 0.5MPa in a secondary foaming device in a water vapor atmosphere, maintaining the pressure for 30s, releasing the pressure, and further obtaining the polybutene foamed beads with higher foaming ratio, wherein the foaming ratio is 30-45 times, the cell density is 0.02-0.025 g/cm3In the meantime.
5) And (3) drying the prepared polybutylene foamed beads for 12h in an environment at 60 ℃, injecting the dried polybutylene foamed beads into a steam compression molding device, heating by steam, and cooling to obtain a polybutylene foamed bead molded body.
The above examples illustrate the present invention in detail. It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions, deletions, and substitutions which may be made by those skilled in the art within the spirit of the present invention are also within the scope of the present invention.
Claims (6)
1. A preparation method of polybutylene expanded bead EPB is characterized in that: the preparation method is a batch kettle type foaming method, and is carried out according to the following steps:
(1) putting the butene copolymer, the nucleating agent and the processing aid used in the experiment into a vacuum drying oven at 40-60 ℃ for drying for 18-48 h;
(2) weighing the dried raw materials according to the proportion, wherein the raw materials comprise the following raw materials in percentage by weight: the butene copolymer is used as base resin, and the using amount is 80-95 percent; 3 to 7 percent of nucleating agent, 0.1 to 0.5 percent of antioxidant and 2 to 15 percent of processing aid; placing the weighed raw materials into an automatic mixer, and stirring for 2-5 min to obtain a mixed material;
(3) adding the mixed material into a double-screw extruder, and cooling, granulating and drying to obtain modified polybutene particles with the length of 1-2mm and the diameter of 0.5-2 mm;
(4) putting the modified polybutylene particles, a dispersing agent and deionized water into an autoclave, injecting a physical foaming agent into the autoclave under a stirring condition, simultaneously raising the temperature of the autoclave to 110-130 ℃, raising the pressure to 2.0-6.0 MPa, and keeping for 20-60min after the set temperature and pressure are reached;
(5) after the pressure maintaining time is over, releasing the pressure of the high-pressure kettle at the pressure release speed of 0.3-2.0MPa/s, and spraying the polybutene beads into a cold water cooling system to obtain polybutene foamed beads with the foaming ratio of 2-20 times; placing the preliminarily obtained polybutylene foaming beads in a secondary foaming device, controlling the pressure to be 0.1-1.5MPa in a steam atmosphere, maintaining the pressure for 10-60 s, and then releasing the pressure to further obtain the polybutylene foaming beads with higher foaming ratio, wherein the foaming ratio is 15-60 times;
in the step (5), the cooling rate of the polybutylene bead-water dispersion system mixture is 10-25 ℃/s;
the butene copolymer is prepared from 1-butene and at least one of comonomers of propylene, ethylene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene and 1-decene; the mol content of the 1-butene in the butene copolymer is 50 to 99 percent; when the butene copolymer contains ethylene, the molar content of the ethylene in the butene copolymer is not more than 15%; when the butene copolymer contains 1-pentene, the molar content of the 1-pentene in the butene copolymer is not more than 20%; when the butene copolymer contains 1-hexene, the molar content of the 1-hexene in the butene copolymer is not more than 20%; when the butene copolymer contains 1-heptene, the molar content of the 1-heptene in the butene copolymer is not more than 20 percent; when the butene copolymer contains 1-octene, the molar content of 1-octene in the butene copolymer is not more than 20%; when the butene copolymer contains 1-nonene, the molar content of the 1-nonene in the butene copolymer is not more than 20 percent; when the butene copolymer contains 1-decene, the molar content of the 1-decene in the butene copolymer is not more than 20%;
the butene copolymer has a molecular weight distribution of Mw/Mn of 2-20 and a melt flow index of 0.1-2g/10min at 190 ℃ under the condition of 2.16 kg.
2. The method of claim 1, wherein said physical blowing agent comprises volatile hydrocarbons, CO2And N2Any one of them or a combination thereof.
3. The method according to claim 1, wherein the nucleating agent is a complex of a β -crystal nucleating agent and an α -crystal nucleating agent; wherein the beta crystal nucleating agent is one or a mixture of two or more of organic carboxylic acid and salts thereof, aromatic amide TMB series and rare earth complex WBG series; the alpha crystal nucleating agent is one or more of organic carboxylic acid and salts thereof, aromatic amides, inorganic nucleating agent with alpha crystal nucleating function, aromatic carboxylates of the alpha crystal nucleating agent and sorbitol series of the alpha crystal nucleating agent; the organic carboxylate refers to a salt of dicarboxylic acid and a group IIA metal element.
4. The method of claim 1, wherein the processing aid is one or more of a foaming nucleating agent, an antioxidant, an antistatic agent, a flame retardant, a color master batch and a coupling agent.
5. The method according to claim 4, wherein the foaming nucleating agent is one or more of talcum powder, mica, glass beads, silicon dioxide, calcium carbonate, montmorillonite, kaolin, alumina, barium sulfate, zinc oxide, zinc stearate and calcium stearate; the antioxidant is one or more of antioxidants 168, 1010, 1076 or 626; the antistatic agent is alkyl imidazoline, quaternary phosphonium salt, quaternary sulfur salt, quaternary ammonium salt, alkyl sulfonate or phosphate; the flame retardant is one or more of magnesium hydroxide, aluminum hydroxide, zinc borate and intumescent flame retardant DTPB; the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.
6. The method of claim 1, wherein the dispersant is one or more of kaolin, sodium dodecylbenzene sulfonate, aluminum sulfate, calcium carbonate, barium sulfate, and aluminosilicate.
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