CN113201167A - Preparation method of hollow EPE particles and foam production process - Google Patents
Preparation method of hollow EPE particles and foam production process Download PDFInfo
- Publication number
- CN113201167A CN113201167A CN202110532582.8A CN202110532582A CN113201167A CN 113201167 A CN113201167 A CN 113201167A CN 202110532582 A CN202110532582 A CN 202110532582A CN 113201167 A CN113201167 A CN 113201167A
- Authority
- CN
- China
- Prior art keywords
- particles
- nucleating agent
- foam
- epe
- polyethylene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
- B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/0014—Use of organic additives
- C08J9/0033—Use of organic additives containing sulfur
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/0014—Use of organic additives
- C08J9/0038—Use of organic additives containing phosphorus
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/009—Use of pretreated compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
- C08J9/236—Forming foamed products using binding agents
-
- C—CHEMISTRY; METALLURGY
- 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
- 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
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
-
- C—CHEMISTRY; METALLURGY
- 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
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a preparation method of hollow EPE particles and a foam production process, and relates to the technical field of foam material production. The preparation method of the hollow EPE particles and the foam production process comprise three steps of a granulation process, a foaming process and a molding process; s1, a granulation process; 1) the preparation method comprises the following steps of: compounding polyethylene resin, a nucleating agent, nano calcium carbonate and an auxiliary agent, and fully stirring and uniformly mixing the components by a high-speed dispersion machine for later use; 2) the materials are sucked by a feeding machine, enter a double-screw extruder for mixing and conveying, are extruded out of a die after being homogenized by a melt pump, and are cut into particles by high-speed underwater granulating equipment. According to the invention, the application field range of the traditional polyethylene foam in packaging, children ground mats and living goods is broken through, solutions such as environmental protection, sound absorption, light weight and cost reduction can be provided in the fields of home furnishing, building materials, industrial parts, automobile parts and the like, and the EPP material has obvious granular appearance and influences the attractiveness.
Description
Technical Field
The invention relates to the technical field of foam material production, in particular to a preparation method of hollow EPE particles and a foam production process.
Background
Most of the existing market hollow particles are made of unfoamed plastic PE or hollow foamed PP materials, are in a cylindrical hollow structure with a circular cross section, and are mainly characterized by light weight, gaps in the middle, capability of being filled with functional additives, and functions of noise reduction and the like; in addition, the common expanded polyethylene in the market is a continuous extrusion expanded polyethylene sheet and solid expanded polyethylene beads.
The continuous extrusion foaming polyethylene sheet is mainly used for deep processing and is applied to the fields of packaging, living and leisure of electronics, home furnishing, household appliances, industry and parts, and the like. The produced sheet deep processing method generally adopts a die cutting flat press to extrude various shapes, and then utilizes manual work to bond the shapes into various shapes by heating or gluing and other modes, but the shapes are simpler, and the requirements for producing complex special-shaped structures cannot be met.
The solid foamed polyethylene beads are mainly produced by a kettle pressure intermittent process, are drawn by a screw extruder, cooled by water, granulated into a cylindrical hollow structure, and then foamed by a high-pressure reaction kettle to prepare the microporous solid foamed polyethylene beads. The produced solid foam beads generally adopt a steam compression molding process, the first step is that the solid foam beads are filled with air through a pre-pressing procedure, and sufficient pressurization time and air pressure are generally needed; filling the prepared foamed polyethylene beads into a die cavity of a special aluminum die, and then performing equipment procedures such as heating, cooling, demolding and the like; and thirdly, putting the prepared foam product into a drying room with set temperature and time, drying, shaping and taking out after the drying.
However, in the production process, the linear low-density polyethylene used in the granulation stage is difficult to granulate, and the phenomenon of tail is easily caused, so that the particles between the beads are bonded and agglomerated during foaming, and the blockage and the rejection rate are high. Meanwhile, a special die needs to be put into the forming stage, the die opening period is long, generally 20-30 days, the die needs to bear steam pressure, the die wall thickness is thick, the manufacturing cost of the die is high due to the fact that an inflating plug needs to be arranged, meanwhile, steam and water are used as a heating source and a cooling source respectively, the required production period is long, meanwhile, the foam particle forming is heated and cooled, the size of a product is unstable, and the granular feeling on the surface of the appearance is strong.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of hollow EPE particles and a foam production process, and solves the defects in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for preparing hollow EPE particles and a foam production process comprise three steps of a granulation process, a foaming process and a molding process;
s1, a granulation process;
1) the preparation method comprises the following steps of: compounding polyethylene resin, a nucleating agent, nano calcium carbonate and an auxiliary agent, and fully stirring and uniformly mixing the components by a high-speed dispersion machine for later use;
2) feeding the materials into a double-screw extruder through a feeding machine for mixing and conveying, extruding the materials out of a die after homogenizing the materials by a melt pump, and granulating the materials by high-speed underwater granulating equipment to prepare flaky reinforced modified polyethylene particles;
s2, a foaming process;
1) firstly, 1000kg of water is added into a high-pressure reaction kettle, then the reinforced modified polyethylene particles prepared in the step 1 are weighed by an automatic weighing scale, the weight is not more than 850kg, and the reinforced modified polyethylene particles are conveyed into the high-pressure reaction kettle through a pipeline;
2) after the reaction is finished, 3000kg of water is continuously added, then 5kg of auxiliary agent is added, the cover of the high-pressure reaction kettle is screwed down, the stirring is started, the steam is used for heating, and the mixed gas of CO2 and N2 is filled for pressurization;
3) potential energy difference is generated inside the particles due to the action of the nucleating agent, and after the potential energy difference reaches a set temperature and pressure, the potential energy difference is released into a storage device with certain pressure through a foaming column, the polyethylene particles can be expanded into foam beads with certain multiplying power, and the foaming density is 30-180 g/L;
s3, forming;
1) pressurizing the prepared foam beads by compressed air to generate internal pressure in foam holes of the beads, and periodically stirring and heating the foam particles uniformly in a tank by setting the temperature in a prepressing tank in the process;
2) mixing the prepared polyethylene foam beads and the adhesive according to a certain proportion, adding the mixture into molds of various shapes, positioning for a certain time, taking out, placing on a platform shelf, and naturally curing or heating and curing in a ventilating way.
Preferably, the raw materials comprise the following components in parts by weight: 100 parts of compound polyethylene resin, 0.003-0.006 part of compound nucleating agent, 0.005-0.008 part of nano calcium carbonate and 0.01-0.015 part of auxiliary agent.
Preferably, the compound polyethylene resin is a compound resin of bimodal low-density polyethylene resin and high-density polyethylene resin, wherein the tensile modulus range of the bimodal low-density polyethylene is 300-1000MPa, and the compound proportion is 80-96%; the compounding ratio of the high-density polyethylene is within the range of 4-20%.
Preferably, the grain size of the compound nucleating agent is controlled to be 1000-3000 meshes, the compound nucleating agent comprises an inorganic nucleating agent and an organic nucleating agent, the ratio of the inorganic nucleating agent is 60-90%, the ratio of the organic nucleating agent is 10-40%, the inorganic nucleating agent uses zinc borate, and the organic nucleating agent uses one or two of polytetrafluoroethylene and organic phosphate.
Preferably, the auxiliary agents are a surfactant and a dispersant, kaolin is used as the dispersant, the compounding proportion is 80-90%, and sodium dodecyl sulfate is used as the surfactant and the compounding proportion is 10-20%.
Preferably, the adhesive is a water-soluble one-component adhesive, the viscosity is 3000-8000, and the solid content is 30-50%.
Preferably, the water-soluble single-component adhesive is one of polyurethane, polyacrylic resin and epoxy resin, and further a polyurethane adhesive is selected.
(III) advantageous effects
The invention provides a preparation method of hollow EPE particles and a foam production process. The method has the following beneficial effects:
1. according to the invention, the application field range of the traditional polyethylene foam in packaging, children ground mats and living goods is broken through, solutions such as environmental protection, sound absorption, light weight and cost reduction can be provided in the fields of home furnishing, building materials, industrial parts, automobile parts and the like, and the EPP material has obvious granular appearance and influences the attractiveness.
2. According to the invention, a special adhesive is selected to improve the compatibility of polypropylene and the adhesive, so that the bonding among beads is satisfied, and the strength among the beads is ensured to satisfy the steam forming performance. In addition, the size of the product can be well controlled by adopting a bonding process, compared with a conventional steam process, the conventional steam mould pressing process is easy to expand when heated, the size is difficult to control, the thickness of the product is ensured, the curing time is ensured, and different materials can be compounded on the surface.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
the embodiment of the invention provides a preparation method of hollow EPE particles and a foam production process, which comprises three steps of a granulation process, a foaming process and a forming process;
s1, a granulation process;
1) the preparation method comprises the following steps of: compounding polyethylene resin, a nucleating agent, nano calcium carbonate and an auxiliary agent, and fully stirring and uniformly mixing the components by a high-speed dispersion machine for later use;
the raw materials comprise the following components in parts by weight: 100 parts of compound polyethylene resin, 0.003-0.006 part of compound nucleating agent, 0.005-0.008 part of nano calcium carbonate and 0.01-0.015 part of auxiliary agent;
the compound polyethylene resin is a compound resin of bimodal low-density polyethylene resin and high-density polyethylene resin, wherein the tensile modulus range of the bimodal low-density polyethylene is 300-1000Mpa, and the compound proportion is 80-96%; the compounding ratio of the high density polyethylene is in the range of 4-20%, the molecular weight distribution of the bimodal low density polyethylene resin has two obvious peak values, and different from other polyethylenes, the high density polyethylene has the characteristics of excellent processability, stress cracking resistance, high mechanical strength and the like, is medium to wide molecular weight distribution MWD, and preferably ranges from 12 to 23, and can provide better processability during extrusion molding
The grain size of the compound nucleating agent is controlled to be 1000-3000 meshes, the compound nucleating agent comprises an inorganic nucleating agent and an organic nucleating agent, the inorganic nucleating agent accounts for 60-90%, the organic nucleating agent accounts for 10-40%, the inorganic nucleating agent uses zinc borate, and the organic nucleating agent uses one or two of polytetrafluoroethylene and organic phosphate;
the organic nucleating agent is selected for compounding, so that the compatibility of a nucleating agent compounding system can be improved, and the nucleating agent is better dispersed uniformly; the nano calcium carbonate in the formula is treated by adding a self-made surface treating agent, so that the activation rate can reach more than 98 percent; the conversion from hydrophilic to lipophilic is completed; the nano calcium carbonate can be distributed in a polymer in the form of primary particles by adding the compatibilizer, and the material is added into a formula system taking polyethylene as carrier resin according to a certain proportion, so that the strength of the original formula is improved by more than 20 percent, and the dimensional stability of the material is greatly improved;
2) the material is sucked by a feeding machine and enters a double-screw extruder for mixing and conveying, the mixture is extruded out of a die after being homogenized by a melt pump, high-speed underwater grain cutting equipment is used for cutting grains, the reinforcing modified polyethylene particles in a flaky shape are prepared, the double-screw extrusion underwater grain cutting process is used, and the specific parameters of double-screw parameters, a die head, grain cutting rotating speed and underwater temperature in the process are as follows: the length-diameter ratio of the selected special customized twin-screw is 65: the screw machine has the advantages that 1, the double-thread medium-depth screw grooves are meshed to rotate in the same direction during rotation, the screw machine has excellent self-cleaning performance and high-speed extrusion flowability, materials are heated in the charging barrel for a short time and uniformly, the screws are combined, so that the pressure and temperature distribution of the materials in different charging barrel sections can be selected, the feeding is stable, the layering phenomenon between powder and particles can be avoided, a melt pump is arranged between a die and the charging barrel, the pressure and the flow of a melt are controlled, and the molten materials can be ensured to uniformly enter a die cavity of the die and be extruded;
the molten polyethylene blending system enters an underwater pelletizing system after being extruded out of a die head, the water temperature is kept between 40 and 45 ℃, the discharge hole on the surface of the die can be prevented from being blocked easily, and the modified polyethylene hollow slice is prevented from being quenched and deformed to influence the form after foaming; then, by controlling the rotating speed of the annular cutter, matching the rotating speed of the extruder, cutting by rotating the cutter at a high speed to obtain annular slices with the diameter of the middle pore of 1-1.2mm, the diameter of the appearance of 3.4-3.6mm and the length of 2.5-3mm, the weight of single particles of 2-2.3mg, and the shape of the cut particles is a hollow flat structure, compared with a slender structure, the structure has larger surface area, can be rapidly and fully cooled after contacting with water, keeps the shape not deformed and has uniform wall thickness;
s2, a foaming process;
1) firstly, 1000kg of water is added into a high-pressure reaction kettle, then the reinforced modified polyethylene particles prepared in the step 1 are weighed by an automatic weighing scale, the weight is not more than 850kg, and the reinforced modified polyethylene particles are conveyed into the high-pressure reaction kettle through a pipeline;
2) after the reaction is finished, 3000kg of water is continuously added, then 5kg of auxiliary agent is added, the cover of the high-pressure reaction kettle is screwed down, the stirring is started, the steam is used for heating, and the mixed gas of CO2 and N2 is filled for pressurization;
3) potential energy difference is generated inside the particles due to the action of the nucleating agent, and after the potential energy difference reaches a set temperature and pressure, the potential energy difference is released into a storage device with certain pressure through a foaming column, the polyethylene particles can be expanded into foam beads with certain multiplying power, and the foaming density is 30-180 g/L;
s3, forming;
1) pressurizing the prepared foam beads by compressed air to generate internal pressure in foam holes of the beads, and periodically stirring and heating the foam particles uniformly in a tank by setting the temperature in a prepressing tank in the process;
2) mixing the prepared polyethylene foam beads and the adhesive according to a certain proportion, adding the mixture into molds of various shapes, positioning for a certain time, taking out, placing on a platform shelf, naturally curing or heating and curing by ventilation, wherein polyurethane is used as the adhesive, and polyurethane components are arranged on the surface of the hollow polyethylene foam, so that surface process treatment can be realized, and the purpose of sticking skins of different materials on the surface appearance is achieved. The skin can be made of fiber, synthetic leather, plastic and the like; the forming die is cast by metal materials and processed into different geometric shapes by CNC (computer numerical control), pipelines of processes such as steam and cooling are not needed to be designed, and die opening and product forming can be realized more quickly.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A preparation method of hollow EPE particles and a foam production process are characterized in that: comprises three steps of a granulation process, a foaming process and a molding process;
s1, a granulation process;
the preparation method comprises the following steps of: compounding polyethylene resin, a nucleating agent, nano calcium carbonate and an auxiliary agent, and fully stirring and uniformly mixing the components by a high-speed dispersion machine for later use;
feeding the materials into a double-screw extruder through a feeding machine for mixing and conveying, extruding the materials out of a die after homogenizing the materials by a melt pump, and granulating the materials by high-speed underwater granulating equipment to prepare flaky reinforced modified polyethylene particles;
s2, a foaming process;
1) firstly, 1000kg of water is added into a high-pressure reaction kettle, then the reinforced modified polyethylene particles prepared in the step 1 are weighed by an automatic weighing scale, the weight is not more than 850kg, and the reinforced modified polyethylene particles are conveyed into the high-pressure reaction kettle through a pipeline;
2) after the reaction is finished, 3000kg of water is continuously added, then 5kg of auxiliary agent is added, the cover of the high-pressure reaction kettle is screwed down, the stirring is started, the steam is used for heating, and the mixed gas of CO2 and N2 is filled for pressurization;
3) potential energy difference is generated inside the particles due to the action of the nucleating agent, and after the potential energy difference reaches a set temperature and pressure, the potential energy difference is released into a storage device with certain pressure through a foaming column, the polyethylene particles can be expanded into foam beads with certain multiplying power, and the foaming density is 30-180 g/L;
s3, forming;
1) pressurizing the prepared foam beads by compressed air to generate internal pressure in foam holes of the beads, and periodically stirring and heating the foam particles uniformly in a tank by setting the temperature in a prepressing tank in the process;
2) mixing the prepared polyethylene foam beads and the adhesive according to a certain proportion, adding the mixture into molds of various shapes, positioning for a certain time, taking out, placing on a platform shelf, and naturally curing or heating and curing in a ventilating way.
2. The method for preparing hollow EPE particles and the process for producing foam according to claim 1, wherein: the raw materials comprise the following components in parts by weight: 100 parts of compound polyethylene resin, 0.003-0.006 part of compound nucleating agent, 0.005-0.008 part of nano calcium carbonate and 0.01-0.015 part of auxiliary agent.
3. The method for preparing hollow EPE particles and the process for producing foam according to claim 2, wherein: the compound polyethylene resin is a compound resin of bimodal low-density polyethylene resin and high-density polyethylene resin, wherein the tensile modulus range of the bimodal low-density polyethylene is 300-1000Mpa, and the compound proportion is 80-96%; the compounding ratio of the high-density polyethylene is within the range of 4-20%.
4. The method for preparing hollow EPE particles and the process for producing a foam according to claim 3, wherein: the grain size of the compound nucleating agent is controlled to be 1000-3000 meshes, the compound nucleating agent comprises an inorganic nucleating agent and an organic nucleating agent, the inorganic nucleating agent accounts for 60-90%, the organic nucleating agent accounts for 10-40%, the inorganic nucleating agent uses zinc borate, and the organic nucleating agent uses one or two of polytetrafluoroethylene and organic phosphate.
5. The method for preparing hollow EPE particles and the process for producing foam according to claim 1, wherein: the auxiliary agent is a surfactant and a dispersant, kaolin is used as the dispersant, the compounding proportion is 80-90%, and sodium dodecyl sulfate is used as the surfactant, and the compounding proportion is 10-20%.
6. The method for preparing hollow EPE particles and the process for producing foam according to claim 1, wherein: the adhesive is a water-soluble single-component adhesive, the viscosity is 3000-8000, and the solid content is 30-50%.
7. The method for preparing hollow EPE particles and the process for producing foam according to claim 6, wherein: the water-soluble single-component adhesive is one of polyurethane, polyacrylic resin and epoxy resin, and further selects a polyurethane adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110532582.8A CN113201167A (en) | 2021-05-17 | 2021-05-17 | Preparation method of hollow EPE particles and foam production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110532582.8A CN113201167A (en) | 2021-05-17 | 2021-05-17 | Preparation method of hollow EPE particles and foam production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113201167A true CN113201167A (en) | 2021-08-03 |
Family
ID=77031477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110532582.8A Pending CN113201167A (en) | 2021-05-17 | 2021-05-17 | Preparation method of hollow EPE particles and foam production process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113201167A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115476564A (en) * | 2022-10-08 | 2022-12-16 | 南京给力新材料有限公司 | Composite material with modified polypropylene foam forming body as core layer and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456963A (en) * | 2009-01-04 | 2009-06-17 | 武汉理工大学 | Method for preparing microsphere composite foam material |
| CN105764968A (en) * | 2013-11-20 | 2016-07-13 | 株式会社钟化 | Polyethylene resin foam particles, polyethylene resin in-mold expansion-molded article, and methods respectively for producing those products |
| CN106589440A (en) * | 2016-12-19 | 2017-04-26 | 江南大学 | Production method of expanded polyethylene/polystyrene beads |
| CN109438745A (en) * | 2018-09-30 | 2019-03-08 | 无锡会通轻质材料股份有限公司 | A kind of preparation method of expanded polypropylene hollow beads |
| CN109651695A (en) * | 2018-12-30 | 2019-04-19 | 无锡会通轻质材料股份有限公司 | A kind of easy clinkering, high temperature tolerance polyethylene foamed bead and preparation method thereof |
-
2021
- 2021-05-17 CN CN202110532582.8A patent/CN113201167A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456963A (en) * | 2009-01-04 | 2009-06-17 | 武汉理工大学 | Method for preparing microsphere composite foam material |
| CN105764968A (en) * | 2013-11-20 | 2016-07-13 | 株式会社钟化 | Polyethylene resin foam particles, polyethylene resin in-mold expansion-molded article, and methods respectively for producing those products |
| CN106589440A (en) * | 2016-12-19 | 2017-04-26 | 江南大学 | Production method of expanded polyethylene/polystyrene beads |
| CN109438745A (en) * | 2018-09-30 | 2019-03-08 | 无锡会通轻质材料股份有限公司 | A kind of preparation method of expanded polypropylene hollow beads |
| CN109651695A (en) * | 2018-12-30 | 2019-04-19 | 无锡会通轻质材料股份有限公司 | A kind of easy clinkering, high temperature tolerance polyethylene foamed bead and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115476564A (en) * | 2022-10-08 | 2022-12-16 | 南京给力新材料有限公司 | Composite material with modified polypropylene foam forming body as core layer and preparation method thereof |
| CN115476564B (en) * | 2022-10-08 | 2024-10-18 | 南京给力新材料有限公司 | Composite material with modified polypropylene foaming formed body as core layer and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101323176B (en) | Method for preparing plastic wood compound material/rigid foam composite and light weight type wall plate | |
| US6153293A (en) | Extruded wood polymer composite and method of manufacture | |
| CA2663315C (en) | A die system and a process for extruding cellular, foamed, cellulosic fibrous-polymer composition | |
| CN1062803C (en) | Extruded synthetic wood composition and method for making same | |
| EP0807510B1 (en) | Polymer and wood flour composite extrusion | |
| CN102869484A (en) | Method for producing composite pellet for extrusion molding, and composite pellet for extrusion molding produced by the method | |
| EP1243388B1 (en) | Manufacturing method for structural members from foamed plastic composites containing wood fiber or flour | |
| CN106883490A (en) | Fretting map master batch and preparation method thereof and refrigerator foaming plate | |
| CN106905636A (en) | The polyvinyl chloride resin wood-plastic decorating material and its manufacture method of adsorbable gas formaldehyde | |
| CN101550755B (en) | Wood-plastic microcellular foamed anion ecological floor and process for producing same | |
| CN113201167A (en) | Preparation method of hollow EPE particles and foam production process | |
| CN106750842A (en) | A kind of polyolefin composition and preparation method thereof | |
| CN109161132A (en) | Polyvinyl chloride automobile interior trimming panel and preparation method thereof | |
| CN101880427A (en) | Renewable imitation wood and manufacturing method thereof | |
| CN87106832A (en) | The production method of cellular PVC-plastic | |
| CN109575480A (en) | A kind of wood-plastic board and preparation method thereof | |
| CN105415839A (en) | Polyvinyl chloride co-extrusion wood-plastic plate and preparation method thereof | |
| US4448738A (en) | Process for producing foamed plastic articles | |
| KR101282820B1 (en) | Lightweight wood-plastic composite and method for manufacturing the same | |
| CN105111570B (en) | A kind of acoustic absorption composite material and preparation method thereof | |
| CN112480508A (en) | Durable composite material tray and production method thereof | |
| CN106366504A (en) | Environmentally-friendly composite material and manufacturing method thereof | |
| CN114426719A (en) | Rotational molding polyethylene composition and preparation method and application thereof | |
| CN109306132A (en) | A kind of diatom plate and production technology | |
| KR101046429B1 (en) | Composite Molding Using Expandable Polystyrene Gel and Its Manufacturing Method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |