CN110183713A - A kind of preparation method of polybutene expanded bead (EPB) - Google Patents

Abstract

The invention provides a method for preparing polybutene foamed beads. The foamed beads are prepared by using polybutene alloy powder as the base resin, using a physical foaming agent, and foaming by batch-type still-type foaming. have to. The polybutene alloy is synthesized by in-pot alloy technology, and other polyolefin components are introduced to effectively improve the crystal transformation speed and impact resistance of polybutene. The invention uses polybutene alloy with high molecular weight and wide molecular weight distribution as raw material, and its melt flow index (190°C, 2.16kg) is 0.1-2g/10min. The polybutene alloy has high melt strength and a wide range of foaming temperatures. With the combined use of different additives, closed-cell foamed beads with uniform and dense cells and adjustable cell diameters can be prepared. The polybutene alloy foamed beads (EPB) prepared by the present invention are a kind of pressure-resistant cushioning heat insulation material, which has excellent high-strength shrinkage resistance, shock absorption and energy absorption, low temperature resistance, and chemical corrosion resistance. It is easy to be molded, and has the advantages of low cost, short cycle time, and controllable density. It can be widely used in military industry, automobile, construction, children's toys, food packaging materials, household appliances and other fields.

Description

A kind of preparation method of polybutylene expanded bead (EPB)

technical field

The invention relates to the technical field of polymer foaming materials, more specifically, the invention relates to a polybutene foaming bead (EPB) and a preparation method thereof.

technical background

Foam plastic is an aggregate formed by dispersing gas in a solid polymer. Foam materials have the advantages of light weight, heat insulation, cushioning, insulation, corrosion resistance, and low price. Therefore, it is widely used in daily necessities, packaging, industry, agriculture, transportation, military industry and aerospace industry. Compared with traditional foam materials, non-crosslinked polyolefin foam materials have excellent mechanical properties and environmental protection properties. Among them, polybutene in polyolefin has good low temperature resistance, creep resistance, corrosion resistance, good mechanical properties and mechanical strength, and its stress cracking resistance is the best compared with other polyolefins. Polybutene alloy is synthesized by in-kettle alloy technology, and other polyolefin components are introduced to effectively improve the crystal transformation speed and impact resistance of polybutene. Polybutene alloy has the characteristics of high molecular weight and wide molecular weight distribution. Therefore, polybutene alloy has high melt strength and wide foaming temperature range. Combined with different processing function additives, cells can be prepared with uniform and dense cells. Adjustable closed-cell foam beads.

Batch-type tank-type foaming generally uses a physical foaming agent to produce foamed beads with a closed-cell structure by utilizing the pressure drop difference between the reactor and the atmospheric pressure. Commonly used physical foaming agents include volatile hydrocarbons, CO ₂ , N ₂ , etc. During the reaction process, no chemical reaction occurs, which greatly reduces the risk of the reaction, does not cause environmental pollution, and is low in cost.

At present, the utilization rate of polybutene in my country is low, and it is mainly used as pipe wall materials for pipes such as water pipes, hot water pipes and heating pipes. Polybutene expanded beads (EPB) have high strength, high toughness, good low temperature resistance, shock absorption resilience, and no pollutants, no organic volatile substances, and no irritating odor during the production process. Automotive interiors, food packaging and transportation, household appliances, and interior decoration have strict requirements on odor. At the same time, the excellent low temperature resistance of EPB can ensure that it still has excellent strength and toughness in ultra-low temperature environments. Therefore, polybutene foam (EPB) has broad development prospects.

In order to make better use of resources, expand the application field of polybutene, improve the utilization rate of polybutene, and promote the development of my country's foaming industry, the present invention proposes a polybutene alloy as a foaming substrate with excellent performance. Polybutylene foam method.

Contents of the invention

Aiming at the problems of low utilization rate and small application field of polybutene materials at present, the present invention provides a polybutene alloy foam material and a preparation method thereof. On the premise of maintaining mechanical properties, it provides a simple production process and an environment-friendly Friendly high-performance polybutylene foam material.

1 A method for preparing polybutene expanded beads (EPB) according to the present invention, the specific formula is as follows: by weight percentage, it is composed of the following raw materials: polybutene alloy powder is used as the base resin, and the dosage is 80% to 95%; nucleating agent 3% to 7%, antioxidant 0.1% to 0.5%, processing aid 2% to 15%.

2 The polybutene alloy powder in the present invention is 1-butene (the molar content of butene in the copolymer is 50%-99%) and propylene (the molar content of propylene in the copolymer is 0%-15%) , ethylene (the molar content of ethylene in the copolymer is 0%-15%), 1-pentene (the molar content of 1-pentene in the copolymer is 0%-20%), 1-hexene (1-hexene The molar content in the copolymer is 0%-20%), 1-heptene (the molar content of 1-heptene in the copolymer is 0%-20%), 1-octene (1-octene in the copolymer The molar content is 0%-20%), 1-nonene (the molar content of 1-nonene in the copolymer is 0%-20%), 1-decene (the molar content of 1-decene in the copolymer is 0%) %-20%) of any one or more than two kinds of comonomers, the molecular weight distribution of the copolymer is Mw/Mn=2-20, and the melt flow index (190°C, 2.16Kg) is 0.1-2g/10min.

3 The preparation method described in the present invention is a batch-type tank-type foaming method.

4 The physical foaming agent described in the present invention includes any one of volatile hydrocarbons, CO ₂ and N ₂ , among which CO ₂ is preferred.

5 The nucleating agent described in the present invention is a compound of a β crystal nucleating agent and an α crystal nucleating agent. Among them, the β crystallization nucleating agent is organic carboxylic acid and its salts (referring to the salt of dicarboxylic acid and Group IIA metal element, especially the binary compound of pimelic acid and calcium stearate), aromatic amide One of the TMB-like series and the WBG series of rare earth complexes or a mixture of two or more. α crystal nucleating agents include organic carboxylic acids and their salts, aromatic amides, inorganic nucleating agents with α crystal nucleating functions, α crystal nucleating agents aromatic carboxylates, α crystal nucleating agents sorbitol, etc. One or more of the series, the total amount of nucleating agent is 0.001 to 3 parts. Preferably, the β crystal nucleating agent is aromatic amide TMB series or rare earth complex WBG series, and the α crystal nucleating agent is an inorganic nucleating agent with α crystal nucleating function. It is further preferred that the total amount of nucleating agents used is 0.01-2 parts.

6 The processing aid described in the present invention is one or more of antioxidants, antistatic agents, flame retardants, color masterbatches, and coupling agents. The dosage of the auxiliary agent is 2-15 parts, preferably 5-12 parts.

7 The foaming nucleating agent of the present invention is talcum powder, mica, glass beads, silicon dioxide, calcium carbonate, montmorillonite, kaolin, aluminum oxide, barium sulfate, zinc oxide, zinc stearate, stearic acid One or more of calcium; the antioxidant is one or more of antioxidants 168, 1010, 1076, 626; the antistatic agent is alkyl imidazolines, quaternary phosphorus salts, One or more of quaternary sulfur salts, quaternary ammonium salts, alkyl sulfonates or phosphates; the flame retardant is magnesium hydroxide, aluminum hydroxide, zinc borate, intumescent flame retardant One or more of DTPB; the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

1) in the above-mentioned foaming nucleating agent, be preferably one or more in nanometer calcium carbonate, talcum powder, silicon dioxide, montmorillonite;

2) Among the above antioxidants, one or both of 1010, 168 are preferred;

3) Among the above-mentioned antistatic agents, it is preferably one or more of quaternary phosphorus salts, quaternary sulfur salts, and quaternary ammonium salts;

4) Among the above flame retardants, preferably one or more of magnesium hydroxide, aluminum hydroxide, zinc borate;

5) Among the above-mentioned coupling agents, a silane coupling agent is preferable.

8 The preparation method of a kind of polybutene expanded beads (EPB) according to the present invention, the foaming method is carried out according to the following steps:

1) Dry the polybutene alloy powder, nucleating agent and processing aid used in the experiment in a vacuum drying oven at 40°C to 60°C for 18 to 48 hours;

2) Weigh the dried raw materials according to the proportion, which consists of the following raw materials in terms of weight percentage: polybutene alloy powder as the base resin, the dosage is 80% to 95%; the nucleating agent is 3% to 7%, and the antioxidant 0.1% to 0.5% of additives, preferably 0.2% to 0.3%, and 2% to 15% of processing aids, preferably 5% to 12%. Place the weighed raw materials in an automatic mixer and stir for 2 to 5 minutes;

3) Put the mixture into the twin-screw extruder, the twin-screw extruder has six temperature ranges, and the temperature is set at 120°C to 160°C; after cooling, pelletizing, and drying, a length of 1-2mm is obtained. , modified polybutene particles with a diameter of 0.5-2mm;

4) Put polybutene particles, dispersant, and deionized water into the autoclave, inject the physical foaming agent into the autoclave under stirring conditions, and raise the temperature of the autoclave to 110-130°C at the same time, and the pressure Raise to 2.0-10.0MPa, after reaching the set temperature and pressure, keep it for 20-60min, so that the foaming agent can penetrate into the polybutene particles;

5) The above-mentioned dispersant is kaolin, stearic acid, sodium dodecylbenzenesulfonate, quaternary ammonium compound, lecithin, amino acid, betaine, fatty acid glyceride, fatty acid sorbitan (sorbitan fatty acid ester) one or more of. Preferred are anionic surfactant sodium dodecylbenzenesulfonate and dispersant kaolin.

6) After the holding time is over, release the pressure from the autoclave at a certain pressure release speed, and spray the polybutene beads into the cold water cooling system to obtain polybutene foamed beads with an expansion ratio of 2-30 times; Put the preliminarily obtained polybutene foam beads in the secondary foaming device, in the water vapor atmosphere, control the pressure 0.1-1.5MPa, keep it for 10-60s and then release the pressure, and further obtain a higher expansion ratio polybutene Oxygen foam beads, the expansion ratio is 15-60 times.

7) Prepare polybutene foamed beads and dry them in an environment of 30-60°C for 10-48 hours, inject the dried polybutene foamed beads into steam compression molding equipment, and heat and cool them with steam to obtain polybutene foamed beads. Butene foamed bead molded body.

9 The pressure release rate of the autoclave of the present invention is 0.3-2.0 MPa/s, preferably 1.0-2.0 MPa/s. The cooling rate of the polybutene bead-water dispersion mixture is 10-25°C/s.

10 Compared with the prior art, the present invention has the following advantages:

The polybutene foam material of the present invention has high strength, high toughness, good low temperature resistance, shock-absorbing resilience, good mechanical properties, and uniform cell distribution. The physical foaming agent is used as the foaming agent, and no polluting gas is emitted during the production process. Moreover, the polybutene foamed beads prepared by the invention can realize cell regulation, and the cell size is close to the micron level, which greatly expands the application of the polybutene material. CN 105670137 A A chemical foaming agent is used to prepare a polybutene foaming material through a molding foaming method. The size of the cells is not easy to control and is likely to cause environmental pollution. And at present my country's polybutene is mainly used in tubular materials such as hot water pipes, and the polybutene material application field is less at present, the polybutene foamed bead preparation method that the present invention develops broadens the polybutene application field, has promoted The development of my country's polybutene industry has good practical significance.

Specific implementation method

Example 1

1) Put 300g of polybutene powder and 1g of inorganic nucleating agent talc powder in a vacuum drying oven at 50°C for 24 hours;

2) The auxiliary agent is mixed uniformly with the resin raw material and the nucleating agent with an automatic mixer according to the formula ratio in weight percentage to obtain a premixed material. Put the premixed material into the twin-screw extruder through the barrel, the screw speed is 80r/min, there are one to six zones from the feeding port to the machine head, and the temperature is respectively set at 150°C, 160°C, 160°C, 160°C °C, 150 °C, 140 °C. Through twin-screw extrusion and water-cooled strand cutting, small modified polybutene particles with a length of 1.5 mm and a diameter of 1.2 mm are obtained;

3) Put polybutene particles, dispersant (kaolin), surfactant (sodium dodecylbenzenesulfonate), and deionized water into the autoclave, and add 1 part of polybutene particles to 100 parts by weight of polybutene particles Kaolin, 0.75 parts surfactant, 200 parts deionized water. Inject the physical foaming agent into the autoclave under stirring conditions, and the stirring rate is 700r/min; at the same time, the temperature of the autoclave is raised to 125°C, and the pressure is raised to 7.5MPa. After reaching the set temperature and pressure, Keep it for 30 minutes to make the foaming agent penetrate into the polybutene particles;

4) Spray the polybutene particle-high pressure water dispersion mixed material into the cold water cooling system with a controlled pressure release rate of 1.0MPa/s in the autoclave, and put the initially obtained polybutene foamed beads in the secondary foaming device, In a water vapor atmosphere, control the pressure at 0.3MPa, keep it for 30s, and release the pressure to further obtain polybutylene foam beads with a higher expansion ratio. The expansion ratio is between 22 and 30 times, and the cell density is 0.03~ Between 0.04g/ ^cm3 .

5) Prepare polybutene foamed beads and dry them at 60°C for 12 hours, inject the dried polybutene foamed beads into steam compression molding equipment, heat and cool with water vapor, and obtain polybutene foamed beads Bead moldings.

Example 2

1) Put 300g of polybutene powder for experiment and 1g of inorganic nucleating agent montmorillonite in a vacuum drying oven at 50°C, and dry for 24h;

2) The auxiliary agent is mixed uniformly with the resin raw material and the nucleating agent with an automatic mixer according to the formula ratio in weight percentage to obtain a premixed material. Put the premixed material into the twin-screw extruder through the barrel, the screw speed is 80r/min, there are one to six zones from the feeding port to the machine head, and the temperature is respectively set at 150°C, 160°C, 160°C, 160°C °C, 150 °C, 140 °C. Through twin-screw extrusion and water-cooled strand cutting, small modified polybutene particles with a length of 1.5 mm and a diameter of 1.2 mm are obtained;

3) Put polybutene particles, dispersant (kaolin), surfactant (sodium dodecylbenzenesulfonate), and deionized water into the autoclave, and add 1 part of polybutene particles to 100 parts by weight of polybutene particles Kaolin, 0.75 parts surfactant, 200 parts deionized water. Inject the physical foaming agent into the autoclave under stirring conditions, and the stirring rate is 700r/min; at the same time, the temperature of the autoclave is raised to 125°C, and the pressure is raised to 7.5MPa. After reaching the set temperature and pressure, Keep it for 20 minutes to make the foaming agent penetrate into the polybutene particles;

4) Spray the polybutene particle-high pressure water dispersion mixed material into the cold water cooling system with a controlled pressure release rate of 2.0MPa/s in the autoclave, and put the initially obtained polybutene foamed beads in the secondary foaming device, In the water vapor atmosphere, control the pressure at 0.3MPa, keep it for 30s, release the pressure, and further obtain higher expansion ratio polybutene foam beads, the expansion ratio is between 25 and 30 times, and the cell density is 0.03~ Between 0.035g/ ^cm3 .

5) Prepare polybutene foamed beads and dry them at 60°C for 12 hours, inject the dried polybutene foamed beads into steam compression molding equipment, heat and cool with water vapor, and obtain polybutene foamed beads Bead moldings.

Example 3

1) Put 300g of polybutene powder for experiment and 2g of inorganic nucleating agent silicon dioxide in a vacuum drying oven at 50°C, and dry for 24h;

2) The auxiliary agent is mixed uniformly with the resin raw material and the nucleating agent with an automatic mixer according to the formula ratio in weight percentage to obtain a premixed material. Put the premixed material into the twin-screw extruder through the barrel, the screw speed is 100r/min, there are one to six zones from the feeding port to the machine head, and the temperature is respectively set at 150°C, 160°C, 160°C, 160°C °C, 150 °C, 140 °C. Through twin-screw extrusion and water-cooled strand cutting, small modified polybutene particles with a length of 1.5 mm and a diameter of 1.2 mm are obtained;

3) Put polybutene microparticles, dispersant (kaolin), surfactant (sodium dodecylbenzenesulfonate), and deionized water into the autoclave, and add 1.2 parts of polybutene microparticles to 100 parts by weight of polybutene microparticles Kaolin, 0.75 parts surfactant, 200 parts deionized water. Inject the physical foaming agent into the autoclave under stirring conditions, and the stirring rate is 700r/min; at the same time, the temperature of the autoclave is increased to 128°C, and the pressure is increased to 7.5MPa. After reaching the set temperature and pressure, Keep it for 20 minutes to make the foaming agent penetrate into the polybutene particles;

4) Spray the polybutene particle-high pressure water dispersion mixed material into the cold water cooling system with a controlled pressure release rate of 1.0MPa/s in the autoclave, and put the initially obtained polybutene foamed beads in the secondary foaming device, In the water vapor atmosphere, control the pressure at 0.3MPa, keep it for 30s, and release the pressure to further obtain polybutylene foam beads with a higher expansion ratio. The expansion ratio is between 14 and 15 times, and the cell density is 0.06~ Between 0.065g/ ^cm3 .

5) Prepare polybutene foamed beads and dry them at 60°C for 12 hours, inject the dried polybutene foamed beads into steam compression molding equipment, heat and cool with water vapor, and obtain polybutene foamed beads Bead moldings.

Example 4

1) Put 300g of polybutene powder and 1g of inorganic nucleating agent nano-calcium carbonate in a vacuum drying oven at 50°C for 24 hours;

2) Mix the auxiliary agent with the experimental raw material and the nucleating agent uniformly with an automatic mixer according to the formula ratio to obtain a premixed material. Put the premixed material into the twin-screw extruder through the barrel, the screw speed is 80r/min, there are one to six zones from the feeding port to the machine head, and the temperature is respectively set at 150°C, 160°C, 160°C, 160°C °C, 150 °C, 140 °C. Through twin-screw extrusion and water-cooled strand cutting, small modified polybutene particles with a length of 1.5 mm and a diameter of 1.0 mm are obtained;

3) Put polybutene particles, dispersant (kaolin), surfactant (sodium dodecylbenzenesulfonate), and deionized water into the autoclave, and add 1 part of polybutene particles to 100 parts by weight of polybutene particles Kaolin, 0.75 parts surfactant, 200 parts deionized water. Inject the physical foaming agent into the autoclave under stirring conditions, and the stirring rate is 700r/min; at the same time, the temperature of the autoclave is raised to 125°C, and the pressure is raised to 10MPa. After reaching the set temperature and pressure, keep 30min, so that the foaming agent penetrates into the polybutene particles;

4) Spray the polybutene particle-high pressure water dispersion mixed material into the cold water cooling system with a controlled pressure release rate of 2.0MPa/s in the autoclave, and put the initially obtained polybutene foamed beads in the secondary foaming device, In the water vapor atmosphere, control the pressure at 0.5MPa, keep it for 30s, release the pressure, and further obtain higher expansion ratio polybutene foam beads, the expansion ratio is between 30 and 45 times, and the cell density is 0.02~ Between 0.025g/ ^cm3 .

5) Prepare polybutene foamed beads and dry them at 60°C for 12 hours, inject the dried polybutene foamed beads into steam compression molding equipment, heat and cool with water vapor, and obtain polybutene foamed beads Bead moldings.

The above-mentioned embodiments illustrate the present invention in detail. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or subtractions, and replacements made by those skilled in the art within the essential scope of the present invention also belong to the protection scope of the present invention.

Claims (11)

1. A preparation method for polybutene expanded beads (EPB), characterized in that: in weight percentage, it is made up of the following raw materials: polybutene alloy powder is used as base resin, and the consumption is 80%～95%; Nucleating agent 3% to 7%, antioxidant 0.1% to 0.5%, processing aid 2% to 15%. 2. the preparation method of a kind of polybutene expanded bead (EPB) according to claim 1, is characterized in that, described polybutene alloy powder is 1-butene (butene in copolymer The molar content is 50%-99%) and propylene (the molar content of propylene in the copolymer is 0%-15%), ethylene (the molar content of ethylene in the copolymer is 0%-15%), 1-pentene (1 The molar content of -pentene in the copolymer is 0%-20%), 1-hexene (the molar content of 1-hexene in the copolymer is 0%-20%), 1-heptene (the molar content of 1-heptene in the The molar content of the copolymer is 0%-20%), 1-octene (the molar content of 1-octene in the copolymer is 0%-20%), 1-nonene (the molar content of 1-nonene in the copolymer The content is 0%-20%), 1-decene (the molar content of 1-decene in the copolymer is 0%-20%), any one or two or more copolymers of comonomers, and the molecular weight distribution of the copolymers Mw/Mn=2-20, melt flow index (190°C, 2.16Kg) 0.1-2g/10min. 3. the preparation method of a kind of polybutene expanded bead (EPB) according to claim 1, is characterized in that, described preparation method is batch-type kettle formula foaming method. 4. the preparation method of a kind of polybutene expanded beads (EPB) according to claim 1 is characterized in that, described physical blowing agent comprises volatile hydrocarbon, CO ₂ , N ₂ any one or combination thereof. 5. the preparation method of a kind of polybutene expanded beads (EPB) according to claim 1, is characterized in that, described nucleating agent is the compound of β crystal nucleating agent and α crystal nucleating agent . Among them, the β crystallization nucleating agent is organic carboxylic acid and its salts (referring to the salt of dicarboxylic acid and Group IIA metal element, especially the binary compound of pimelic acid and calcium stearate), aromatic amide One or a mixture of two or more of TMB-like series and WBG series of rare earth complexes; α-crystal nucleating agents are organic carboxylic acids and their salts, aromatic amides, and inorganic compounds with α-crystal nucleation functions. One or more of the series of nucleating agents, α crystal nucleating agents aromatic carboxylates, α crystal nucleating agents sorbitol, etc. The dosage of the total nucleating agent is 0.001-3 parts. 6. the preparation method of a kind of polybutene expanded beads (EPB) according to claim 1, is characterized in that, described processing aid is foaming nucleating agent, antioxidant, antistatic agent, One or more of flame retardants, color masterbatches, and coupling agents. The amount of additives is 2 to 15 parts. 7. the preparation method of a kind of polybutene expanded beads (EPB) according to claim 1 is characterized in that, the foaming nucleating agent in the auxiliary agent described in claim 6 is talcum powder, mica, glass One or more of beads, silicon dioxide, calcium carbonate, montmorillonite, kaolin, aluminum oxide, barium sulfate, zinc oxide, zinc stearate, calcium stearate; the antioxidant is an antioxidant One or more of 168, 1010, 1076, 626; the antistatic agent is alkyl imidazolines, quaternary phosphorus salts, quaternary sulfur salts, quaternary ammonium salts, alkyl sulfonates or phosphoric acid Salts; the flame retardant is one or more of magnesium hydroxide, aluminum hydroxide, zinc borate, intumescent flame retardant DTPB; the coupling agent is a silane coupling agent, titanate coupling One or more of the agent, aluminate coupling agent. 8. according to the preparation method of a kind of polybutene expanded beads (EPB) described in any one in claim 1～7, it is characterized in that, foaming method is carried out according to the following steps: 1) Dry the polybutene alloy powder, nucleating agent and processing aid used in the experiment in a vacuum drying oven at 40°C to 60°C for 18 to 48 hours; 2) The dried raw materials are weighed according to the proportion, which is composed of the following raw materials in terms of weight percentage: polybutene alloy powder is used as the base resin, and the dosage is 80% to 95%; the nucleating agent is 3% to 7%. Oxygen agent 0.1% ~ 0.5%, processing aid 2% ~ 15%. Place the weighed raw materials in an automatic mixer and stir for 2 to 5 minutes; 3) Add the mixed material into a twin-screw extruder, and after cooling, pelletizing and drying, obtain modified polybutene particles with a length of 1-2 mm and a diameter of 0.5-2 mm; 4) Put the modified polybutene particles, dispersant, and deionized water into the autoclave, inject the physical foaming agent into the autoclave under stirring conditions, and raise the temperature of the autoclave to 110-130°C , the pressure is increased to 2.0-6.0MPa, and after reaching the set temperature and pressure, keep it for 20-60min, so that the foaming agent penetrates into the polybutene particles; 5) After the pressure holding time is over, release the pressure from the autoclave at a certain pressure relief speed, and spray the polybutene beads into the cold water cooling system to obtain polybutene foamed beads with an expansion ratio of 2-20 times; Put the preliminarily obtained polybutene foam beads in the secondary foaming device, in the water vapor atmosphere, control the pressure 0.1-1.5MPa, keep it for 10-60s and then release the pressure, and further obtain a higher expansion ratio polybutene Oxygen foam beads, the expansion ratio is 15-60 times. 6) Prepare polybutene foamed beads and dry them in an environment of 30-60°C for 10-48 hours, inject the dried polybutene foamed beads into steam compression molding equipment, and heat and cool them with steam to obtain polybutene foamed beads. Butene foamed bead molded body. 9. The method according to claim 8, characterized in that, the dispersant is one or more of kaolin, sodium lauryl sulfonate, aluminum sulfate, calcium carbonate, barium sulfate, aluminosilicate . 10. The method according to claim 8, characterized in that, the physical blowing agent is one or both of carbon dioxide and nitrogen. 11. method according to claim 8 is characterized in that, in step (5), the pressure release rate of autoclave is 0.3-2.0MPa/s, and the cooling rate of polybutene beads-water dispersion system mixture is 10 -25°C/s.