CN114989531A - EPP foaming bead with short production period and molded part thereof - Google Patents
EPP foaming bead with short production period and molded part thereof Download PDFInfo
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- CN114989531A CN114989531A CN202210388373.5A CN202210388373A CN114989531A CN 114989531 A CN114989531 A CN 114989531A CN 202210388373 A CN202210388373 A CN 202210388373A CN 114989531 A CN114989531 A CN 114989531A
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- 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
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- 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
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—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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- 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
- C08J9/232—Forming foamed products by sintering expandable particles
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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
- C08J2323/10—Homopolymers or copolymers of propene
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- 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
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Abstract
The invention relates to the field of foamed polyolefin, in particular to short-production-period EPP foamed beads and a molded part thereof, wherein the short-production-period EPP foamed beads comprise the following components in parts by weight: 79-90 parts of polypropylene, 0.05-0.2 part of nucleating agent, 10-20 parts of structure stabilizer and 0.02-0.1 part of expansion aid. According to the invention, the expansion aid is added into the foaming polypropylene raw material, the expansion aid consists of an oxide which reacts with water to release heat and an inorganic salt water absorbent according to a mass ratio of 1:1-2, after foaming is finished, the internal inorganic salt water absorbent can gradually migrate to the surface of a product, and when molding is carried out, water molecules in steam can be captured, combined with the internal oxide and released heat from the interior of particles, so that the expansibility of the particles in molding is improved, the steam energy consumption in the molding process can be reduced, and the particles are easier to fuse. Solves the problems of higher molding pressure and longer molding period of common foamed polypropylene product parts.
Description
Technical Field
The invention relates to the field of foamed polyolefin, in particular to short-production-period EPP foamed beads and a molded part thereof.
Background
The polypropylene foaming material (EPP) has the characteristics of light weight, high strength, acid and alkali corrosion resistance, greenness, recyclability and environmental protection, and is widely applied to the market, such as common automobile and packaging industries. With the recent development of the EPP market, its application in aerospace, military, high-speed rail and household is more ubiquitous.
The common expanded polypropylene parts are mostly formed by EPP bead steam molding, and need to undergo three stages of pressure maintaining (0.3-0.5Mpa, time > 10 hours), steam molding pressure (more than 0.2Mpa, production period 150 + 600s), drying and shaping (temperature 80 ℃, time > 10 hours), the process not only consumes time, but also consumes high steam energy. Moreover, the relatively high molding pressure results in EPP molding requiring the differentiation of conventional EPS molding equipment and the additional customization of specialized equipment.
In order to solve the problems, a low-melting-point polypropylene raw material is usually selected to prepare EPP foaming beads with lower energy consumption, but the rigidity of EPP parts cannot be considered, and the service performance of the molded parts is seriously influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problems to be solved by the invention are as follows: the molding pressure of the common foamed polypropylene product part is higher and the molding period is longer, the molding pressure exceeds 0.2MPa, and the molding period is 150-600s for different products.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the short-production-period EPP foaming bead comprises the following components in parts by weight:
wherein, the dosage of the expansion aid is preferably 0.05 to 0.1 part.
Preferably, the polypropylene is binary copolymer or ternary copolymer polypropylene, the melting point is 130-150 ℃, and the modulus is 800-1400 MPa.
Preferably, the nucleating agent is micron-sized inorganic powder particles; the nucleating agent is PTFE, zinc borate, calcium carbonate powder and talcum powder.
Preferably, the nucleating agent has an average particle diameter of 5 to 10 μm.
Preferably, the structure stabilizer is one or a combination of more than two of calcium carbonate, silicon dioxide, titanium dioxide, talcum powder and barium sulfate.
Preferably, the expansion aid is a mixture of an oxide which reacts with water and releases heat and an inorganic salt water absorbing agent according to the mass ratio of 1: 1-2.
Preferably, the water-reactive exothermic oxide is calcium oxide, iron oxide or potassium oxide.
Preferably, the inorganic salt water absorbing agent is sodium sulfate, sodium acrylate or copper sulfate.
Preferably, the dispersant is a mixture of kaolin and butter according to the mass ratio of 1-2:1, and the average particle size of the kaolin is 100-500 nm.
Preferably, the preparation method comprises the following steps:
(1) drying the polypropylene, the nucleating agent, the structure stabilizer and the expansion aid until the water content is less than or equal to 0.05 percent for later use;
(2) adding the dried polypropylene, the nucleating agent, the structure stabilizer and the expansion aid into a double-screw extruder for extrusion granulation to obtain an easily expandable master batch with the length of 1.5-3mm and the single-particle weight of 1.0-2.0 mg;
(3) putting the obtained easily-expandable master batch, water and a dispersing agent into a reaction kettle, controlling the material-water ratio to be 0.0005-0.6:1, and controlling the adding amount of the dispersing agent to be 0.07-2% of the mass of the fed particles, and obtaining EPP foamed beads with the foaming density of 30-200g/l by a kettle pressure foaming process.
Preferably, the screw extrusion temperature in the step (2) is 180 ℃ and 230 ℃, and the extrusion rate is 80-150 kg/h.
Preferably, the temperature of the kettle pressure foaming process in the step (3) is 140-155 ℃, the back pressure in the kettle is 1.5-3.8MPa, the back pressure is provided by carbon dioxide, the heating time is 50-100min, the pressure relief pressure is 0.1-0.2MPa, the conveying speed for conveying the EPP foaming beads during pressure relief is 27-34min/kg, and the heat preservation temperature of a pipeline is 100-120 ℃. Wherein, after the foaming is completed, EPP foaming beads need to be conveyed through a pipeline, and the temperature of the pipeline is ensured to be 100-120 ℃.
A process for preparing molded parts using short production cycle EPP expanded beads comprising the steps of:
(1) drying the EPP foaming beads until the moisture content is less than or equal to 0.05 percent for later use;
(2) and (2) maintaining the pressure of the dried EPP foamed beads in a pre-pressing tank, adjusting the pressure to be 0.2-0.4Mpa according to different foaming densities, conveying the EPP foamed beads through a pipeline after the pressure is not less than 8 hours, placing the EPP foamed beads in a forming mold for steam molding, so that the EPP foamed beads are subjected to expansion welding, and drying the obtained product at 80 ℃ for 4-6 hours after the process is finished to obtain a molded part.
Preferably, the method for preparing the molding part by using the EPP foaming beads with short production period has the molding pressure of 0.15-0.24MPa for steam molding and can shorten the molding period by 20-50 percent correspondingly;
the invention has the beneficial effects that:
(1) according to the invention, the expansion aid is added into the foaming polypropylene raw material, the expansion aid consists of an oxide which reacts with water to release heat and an inorganic salt water absorbent according to a mass ratio of 1:1-2, after foaming is finished, the internal inorganic salt water absorbent can gradually migrate to the surface of a product, when molding is carried out, water molecules in steam can be captured, the water molecules are combined with the internal oxide and release heat is formed from the interior of particles, so that the expansibility of the particles in molding is improved, the steam energy consumption in the molding process can be reduced, and the particles are easier to fuse;
(2) in the invention, a kaolin and butter compound is added as a dispersant in the polypropylene foaming process, and the kaolin is wrapped outside the particles in the foaming process of the dispersant to isolate the contact between the particles, so that the probability of the reaction of water and internal oxides under a certain high temperature and a certain high pressure can be reduced;
(3) after the kettle pressure foaming process is finished, the expanded polypropylene beads in the conveying pipeline are subjected to heat preservation at 100 ℃ and 120 ℃, so that in the foaming process, cells in the particles can have a longer growth period and can become larger, the outer skin of the foamed particles is positioned near a softening point at high temperature, the foaming density can be lower along with the growth of the inner cells, and the aim of producing high-magnification products at one time is fulfilled.
Drawings
FIG. 1: is the surface of the molded article obtained in comparative example 2 of the present invention;
FIG. 2 is a schematic diagram: is the surface of the molded article obtained in example 2 of the present invention;
FIG. 3: is the surface of the molded article obtained in example 4 of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to examples.
Preparation of example 1
A short production cycle EPP expanded bead, the preparation method of which comprises the following steps:
(1) drying the polypropylene, the nucleating agent and the structure stabilizer until the water content is less than or equal to 0.05 percent for later use;
(2) adding the dried polypropylene, the nucleating agent, the structure stabilizer and the expansion aid into a double-screw extruder for extrusion granulation, wherein the screw extrusion temperature is 180 ℃ and 230 ℃, and the extrusion rate is 80-150kg/h, so as to obtain the easily expandable master batch with the length of 1.5-3mm and the single-particle weight of 1.0-2.0 mg;
(3) uniformly mixing the easily-expandable master batch and a dispersing agent, adding water, controlling the mass ratio of the material to the water to be 0.005-0.6:1, and obtaining EPP (expanded polypropylene) expanded beads with the expanded density of 30-200g/l by a kettle pressure foaming process, wherein the temperature of the kettle pressure foaming process is 140-155 ℃, the back pressure in the kettle is 1.5-3.8Mpa, the back pressure is provided by carbon dioxide, the heating time is 50-100min, the pressure relief pressure is 0.1-0.2MPa, and the heat preservation temperature of a pipeline for conveying the EPP expanded beads during pressure relief is 100-120 ℃.
Example 1
The short-production-period EPP foaming bead consists of the following components in parts by weight:
the expansion aid is composed of calcium oxide and sodium sulfate according to the mass ratio of 1: 1;
the preparation process parameters are as follows: the kettle pressure foaming process temperature is 146 ℃, the back pressure in the kettle is 1.8MPa, the foaming density is 45g/l,
example 2
The short-production-cycle EPP foamed bead consists of the following components in parts by weight:
the expansion aid is composed of ferric oxide and copper sulfate according to the mass ratio of 1: 2.
Example 3
The short-production-period EPP foaming bead consists of the following components in parts by weight:
the expansion aid is composed of potassium oxide and sodium acrylate according to the mass ratio of 1:1.5,
example 4
The short-production-cycle EPP foamed bead consists of the following components in parts by weight:
the expansion aid is composed of ferric oxide and copper sulfate according to the mass ratio of 1:1.
Comparative example 1 is the same as example 4 except that no structure stabilizer is added to comparative example 1.
Comparative example 2 is the same as example 4 except that the preparation method is different.
Comparative example 3 is the same as example 4 except that no co-swelling agent was added in comparative example 3.
Comparative example 4 is the same as example 4 except that the co-swelling agent of comparative example 4 does not contain copper sulfate and only contains iron oxide.
Comparative example 5 is the same as example 4 except that the co-swelling agent of comparative example 5 contains only copper sulfate and no iron oxide.
Comparative example 6 is the same as example 2 except that the titanium dioxide is added in an amount of 0.01 part in comparative example 6.
Comparative example 7 is the same as example 4 except that the preparation method is different.
Comparative example 8 is the same as example 4 except that the preparation method is different.
Comparative example 9 is the same as example 4 except that the preparation method is different.
Wherein the specific preparation processes of examples 1-4 and comparative examples 1-9 are shown in the following table:
the EPP expanded beads of the present invention obtained in the following examples 1 to 4 and comparative examples 1 to 9 were prepared into molded articles by the following procedure:
(1) drying the EPP foaming beads until the moisture content is less than or equal to 0.05 percent for later use;
(2) and (2) maintaining the pressure of the dried EPP foamed beads in a pre-pressing tank, adjusting the pressure to be 0.2-0.4Mpa according to different foaming densities, conveying the EPP foamed beads through a pipeline after the pressure is not less than 8 hours, placing the EPP foamed beads in a forming mold for steam molding, wherein the molding pressure is 0.15-0.24Mpa, so that the EPP foamed beads are expanded and welded, and drying the obtained product at 80 ℃ for 4-6 hours after the process is finished to obtain a molded part.
The preparation process comprises the following steps:
in light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (14)
1. Short production cycle EPP expanded beads comprising, in parts by weight:
2. the EPP expanded bead with short production period as claimed in claim 1, wherein the polypropylene is binary copolymer or ternary copolymer polypropylene, the melting point is 130-.
3. A short production period EPP expanded bead according to claim 1, wherein said nucleating agent is a micron-sized inorganic powder particle; the nucleating agent is PTFE, zinc borate, calcium carbonate powder and talcum powder.
4. A short production period EPP expanded bead according to claim 3, characterized in that the average particle size of said nucleating agent is 5-10 μm.
5. The short production cycle EPP expanded beads according to claim 1, wherein the structure stabilizer is one or a combination of two or more of calcium carbonate, silica, titanium dioxide, talc and barium sulfate.
6. The short-production-cycle EPP expanded beads according to claim 1, wherein the expansion aid is a mixture of an oxide which reacts with water to release heat and an inorganic salt water absorbing agent in a mass ratio of 1: 1-2.
7. A short production cycle EPP expanded bead according to claim 6, wherein said water-reactive exothermic oxide is calcium oxide, iron oxide or potassium oxide.
8. The short production cycle EPP expanded beads according to claim 7, wherein the inorganic salt water absorbing agent is sodium sulfate, sodium acrylate or copper sulfate.
9. A short production period EPP expanded bead according to any of claims 1 to 8, characterized in that it is prepared by a process comprising the following steps:
(1) drying the polypropylene, the nucleating agent, the structure stabilizer and the expansion aid until the water content is less than or equal to 0.05 percent for later use;
(2) adding the dried polypropylene, the nucleating agent, the structure stabilizer and the expansion aid into a double-screw extruder for extrusion granulation to obtain an easily expandable master batch with the length of 1.5-3mm and the single-particle weight of 1.0-2.0 mg;
(3) putting the obtained easily-expandable master batch, water and a dispersing agent into a reaction kettle, controlling the material-water ratio to be 0.0005-0.6:1, and controlling the adding amount of the dispersing agent to be 0.07-2% of the mass of the fed particles, and obtaining EPP foamed beads with the foaming density of 30-200g/l by a kettle pressure foaming process.
10. The EPP expanded bead with short production period according to claim 1, wherein the dispersant is a mixture of kaolin and butter at a mass ratio of 1-2:1, and the average particle size of kaolin is 100-500 nm.
11. The short production period EPP expanded beads according to claim 10, wherein the screw extrusion temperature in step (2) is 180-230 ℃ and the extrusion rate is 80-150 kg/h.
12. The EPP expanded beads with short production period as claimed in claim 10, wherein the temperature of the kettle pressure expansion process in step (3) is 140-.
13. A method for producing a molded article using the short production cycle EPP expanded beads according to any one of claims 10 to 12, comprising the steps of:
(1) drying the EPP foaming beads until the moisture content is less than or equal to 0.05 percent for later use;
(2) and (2) maintaining the pressure of the dried EPP foamed beads in a pre-pressing tank, adjusting the pressure to be 0.2-0.4Mpa according to different foaming densities, conveying the EPP foamed beads through a pipeline after the pressure is not less than 8 hours, placing the EPP foamed beads in a forming mold for steam molding, so that the EPP foamed beads are expanded and welded, and drying the obtained workpiece at 80 ℃ for 4-6 hours after the process is finished to obtain a molded part.
14. The method for preparing the molded and formed part of the EPP expanded beads with the short production period as claimed in claim 13, wherein the molding pressure of the steam molding is 0.15-0.24MPa, and the molding period can be correspondingly shortened by 20% -50%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1702945A1 (en) * | 2005-03-18 | 2006-09-20 | Basf Aktiengesellschaft | Polyolefin foam particles containing fillers |
| CN102089369A (en) * | 2008-09-30 | 2011-06-08 | 积水化学工业株式会社 | Masterbatch for foam molding and molded foam |
| EP3872121A1 (en) * | 2020-02-28 | 2021-09-01 | Borealis AG | Expanded polypropylene beads, a process for producing expanding polypropylene beads, molded articles formed from expanded polypropylene beads, and a process for forming such molded articles |
| CN113831647A (en) * | 2021-09-18 | 2021-12-24 | 无锡会通轻质材料股份有限公司 | Preparation method of expanded polypropylene beads |
| CN113956530A (en) * | 2021-11-02 | 2022-01-21 | 无锡会通轻质材料股份有限公司 | Energy-saving expanded polypropylene bead and molded part thereof |
-
2022
- 2022-04-13 CN CN202210388373.5A patent/CN114989531B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1702945A1 (en) * | 2005-03-18 | 2006-09-20 | Basf Aktiengesellschaft | Polyolefin foam particles containing fillers |
| CN102089369A (en) * | 2008-09-30 | 2011-06-08 | 积水化学工业株式会社 | Masterbatch for foam molding and molded foam |
| EP3872121A1 (en) * | 2020-02-28 | 2021-09-01 | Borealis AG | Expanded polypropylene beads, a process for producing expanding polypropylene beads, molded articles formed from expanded polypropylene beads, and a process for forming such molded articles |
| CN113831647A (en) * | 2021-09-18 | 2021-12-24 | 无锡会通轻质材料股份有限公司 | Preparation method of expanded polypropylene beads |
| CN113956530A (en) * | 2021-11-02 | 2022-01-21 | 无锡会通轻质材料股份有限公司 | Energy-saving expanded polypropylene bead and molded part thereof |
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