CN110682493A - Method for in-mold foaming by electronic crosslinking - Google Patents
Method for in-mold foaming by electronic crosslinking Download PDFInfo
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- CN110682493A CN110682493A CN201810736223.2A CN201810736223A CN110682493A CN 110682493 A CN110682493 A CN 110682493A CN 201810736223 A CN201810736223 A CN 201810736223A CN 110682493 A CN110682493 A CN 110682493A
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- foaming
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- 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
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Abstract
The present invention relates to a method for in-mold foaming by electronic crosslinking, which comprises the following steps: pressing at least one foaming material into at least one foaming piece. The electron beam irradiates at least one foaming member. At least one foaming member irradiated by the electron beam is placed in a mold. Heating at least one foaming piece in the foaming mold. Thus, the present invention uses the electron beam foaming bridging method to replace the chemical bridging, so as to reduce the usage of the chemical bridging agent, thereby reducing the influence of the chemical bridging agent on the human body and the environment. Moreover, after at least one foaming piece irradiated by the electron beam is placed in the mould, at least one foaming piece in the mould is heated to carry out in-mould foaming, so that the problem of waste materials is not easy to generate.
Description
Technical Field
The present invention relates to a method for in-mold foaming, and more particularly to a method for in-mold foaming by electron crosslinking through electron beam irradiation.
Background
The foaming material is made by using different polymers as base materials and forming numerous tiny air holes in the base materials by using proper foaming agents and catalysts, has various types, can be classified according to foaming multiplying power, hardness and foaming structures, and is respectively suitable for different industrial products. The soft foaming material is prepared by crosslinking and foaming raw materials such as plastics (such as PE and EVA) and rubber (such as SBR and CR) and forming a large number of air holes in the plastics and the rubber. The soft foaming material can be used as a sealing gasket, a waterproof adhesive tape, an insulating material and the like, is widely applied to industries such as electronics, household appliances, automobiles, sports and leisure, is closely related to civil activities, is also an indispensable material in industry, and has different thicknesses required by different industrial products.
In the process of foaming shoe materials, a cross-linking agent is added before foaming to perform a bridging reaction, then the mixed foaming material is heated and melted to foam, and finally the heated foaming material is injected into a mold and is processed and molded. The conventional cross-linking agent is organic peroxide, which is toxic and costly, and the foaming materials with different mixing ratios are suitable for cross-linking agents with different components, and it takes time and cost to perform tests, which not only causes health hazard to operators, but also causes environmental hazard. With the rising awareness of environmental protection, the industry is working to develop alternatives to crosslinking agents. Further, the foam material is manufactured by injection molding, which easily generates extra material. Therefore, the present invention is directed to improving the above-mentioned disadvantages.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention cannot be solved by the prior art. The cross-linking agent in the prior art is organic peroxide which is toxic and high in cost, and the foaming materials with different mixing ratios are suitable for cross-linking agents with different components, so that the time and cost are consumed for testing, and the cross-linking agent causes health hazards to operators and also causes environmental hazards. Further, the foam material is manufactured by injection molding, which easily generates extra material.
In order to solve the above problems, the present invention provides a method for in-mold foaming by electron crosslinking, comprising the steps of: pressing at least one foaming material into at least one foaming piece; irradiating at least one foaming piece by electron beams; placing at least one foaming piece irradiated by the electron beam into a mold; and heating at least one foaming piece in the foaming mold.
According to an embodiment of the present invention, the at least one foaming material is Ethylene Vinyl Acetate (EVA), metallocene, Ethylene Propylene Diene Monomer (EPDM), Polystyrene (PS), Nitrile Butadiene Rubber (NBR), Styrene Butadiene Rubber (SBR), diene elastomer (TPE), thermoplastic polyurethane elastomer (TPU), polyolefin elastomer (TPO), thermoplastic elastomer (TPR), or a combination of two or more of the foregoing.
According to an embodiment of the present invention, in the step of pressing the at least one foaming material into the at least one foamed member, a bridging aid is added.
According to an embodiment of the present invention, the at least one foaming material is Polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), metallocene, Ethylene Propylene Diene Monomer (EPDM), Polystyrene (PS), Nitrile Butadiene Rubber (NBR), Styrene Butadiene Rubber (SBR), diene elastomer (TPE), thermoplastic polyurethane elastomer (TPU), polyolefin elastomer (TPO), thermoplastic elastomer (TPR), or a combination of any two or more of the above.
According to an embodiment of the present invention, in the step of pressing the at least one foaming material into the at least one foaming member, the at least one foaming member has a shape of a granule, a sheet, a plate, a powder or a strip.
According to an embodiment of the present invention, in the step of irradiating the at least one foaming member with the electron beam, the irradiation dose of the electron beam is 400kv to 2000 kv.
According to an embodiment of the present invention, in the step of irradiating the at least one foaming member with the electron beam, the electron beam is irradiated to a depth of 3KGY to 60 KGY.
According to an embodiment of the present invention, after the step of heating the at least one foamed member irradiated by the foaming electron beam, the cell diameter of the at least one foamed member is 0.002mm to 0.4 mm.
According to an embodiment of the present invention, after the step of heating the at least one foamed member irradiated by the foaming electron beam, the bridging connection rate of the at least one foamed member is 10% to 80%.
The present invention provides a method for in-mold foaming by electron crosslinking, which is simple and fast in the process of electron bridging by electron beam irradiation, can eliminate the harm of organic chemical substances, can reduce the manufacturing cost of adding a crosslinking agent, and can shorten the testing time of the bridging reaction condition of the foaming material. The method of using electron cross-linking to perform in-mold foaming can improve the physical properties of the foaming material, and the foaming uniformity is better, and in addition, the use of electron beam irradiation in combination with in-mold foaming can avoid the generation of waste material.
Drawings
FIG. 1 is a flow chart showing the steps of the method for in-mold foaming by electronic crosslinking according to the present invention.
Detailed Description
For further understanding and appreciation of the features and advantages of the invention, reference will now be made to the following examples, taken in conjunction with the accompanying detailed description, in which:
please refer to fig. 1, which is a flowchart illustrating the steps of the method for in-mold foaming by electronic crosslinking according to the present invention. As shown, the present embodiment provides a method for in-mold foaming by electronic crosslinking, which is used for the related production of foams or materials. The method of using electron cross-linking to foam in mold of this embodiment can improve the disadvantages of the conventional foaming process, reduce the dosage of the chemical bridging agent (i.e. toxic substance), or even perform the foaming related process without using the chemical bridging agent, so as to reduce the influence of the chemical bridging agent on the environment and human body, and also solve the problems of the conventional foaming process, such as poor efficiency and limited application flexibility of the foamed product. Furthermore, the foaming material can reduce the generation of waste material through in-mold foaming, thereby avoiding unnecessary waste.
The method for in-mold foaming using electron crosslinking of the present invention comprises the steps of, at step S1: pressing at least one foaming material into at least one foaming piece. In this embodiment, at least one foaming material is ethylene vinyl acetate copolymer (EVA), metallocene, Ethylene Propylene Diene Monomer (EPDM), Polystyrene (PS), Nitrile Butadiene Rubber (NBR), Styrene Butadiene Rubber (SBR), diene elastomer (TPE), thermoplastic polyurethane elastomer (TPU), polyolefin elastomer (TPO), thermoplastic elastomer (TPR), or a combination of two or more of the foregoing. The user presses the obtained at least one foaming material into at least one foaming piece with various shapes such as granules, sheets, plates, powder or strips.
Furthermore, the structural characteristics of some foams (such as Polyethylene (PE) and polypropylene (PP)) have long main chain and few side chains, and in connection with such foams, a bridging aid (DCP) is further added as an aid, and the bridging aid is added before the foaming process, so as to perform a bridging reaction, thereby facilitating the subsequent foaming process. In addition, the foam material of the present embodiment is various in types, and can be mixed and used according to the needs of users, so as to obtain foam materials with different properties (such as water absorption, air permeability, sound absorption, heat insulation, specific strength, resilience, etc.) for foaming.
In step S3: the electron beam irradiates at least one foaming member. In this embodiment, the electron beam irradiation dose is 400-2000 kv, and the irradiation depth is 3-60 KGY. Thus, the connection rate of the electron bridge formed by irradiating at least one foaming piece by the electron beam is 10-80%. There are many ways of electron beam irradiation, which can cause the difference of electron beam irradiation through the irradiation dose and irradiation depth control, and further cause the irradiated foaming piece to generate different bridging ways. For example, the electron beam irradiates the granular foaming piece, which can make the surface of the granular foaming piece have a bridging structure, and the inner layer has no bridging structure; or one half of the granular foaming piece has a bridging structure, and the other half has no bridging structure. The different electron beam irradiation modes can be adjusted and changed according to the requirements of users. The electron beam irradiation process of the present embodiment is simple and fast, and the molecules are cross-linked to form a network structure, so as to improve the physical properties of the foam material and achieve better foaming uniformity.
In step S5: at least one foaming member irradiated by the electron beam is placed in a mold. In this embodiment, at least one foaming member having an electronic bridge is placed in the mold, that is, the outline of the at least one foaming member to be deformed after foaming is preset, so that the at least one foaming member is deformed into the required shape and size after foaming. At least one foaming member is foamed in the mold, which can avoid the generation of waste material.
In step S7: heating at least one foaming piece in the foaming mold. In this embodiment, at least one foaming member having an electronic bridge inside the mold is heated to foam the at least one foaming member. Wherein the pore diameter of at least one foaming piece is 0.002mm-0.4 mm.
In this embodiment, at least one foaming member is irradiated with an electron beam to form a bridge in the at least one foaming member. Therefore, the usage amount of the existing chemical bridging agent can be reduced by replacing the chemical bridging mode with the electronic bridging agent, or the chemical bridging agent can be completely replaced, so that the bad smell and toxin generated by the chemical bridging agent are reduced, and the influence on the environment and the human body is reduced. The electronic bridge is formed by one-step bridge formation, and the fixation of the bridge of at least one foaming piece is not changed after the electron beam irradiation is finished, so that the bridge is not influenced by the temperature of the rear-section heating foaming process any more, and the bridge can be easily recycled. On the contrary, the chemical bridging agent is affected by the temperature of the back-end heating foaming process, thereby causing difficulty in recycling. In addition, waste materials are not generated in the mode of placing at least one foaming piece into the mold for heating and foaming, and the foaming materials are mixed in a chemical bridging mode and then foamed in the mode of injecting into the mold after being heated and melted, so that redundant waste materials are easy to generate. The process of electron beam irradiation for electron bridging is simple and fast, so that the molecules are cross-linked to form a network structure, thereby improving the physical properties of the foam material and achieving better foaming uniformity.
In summary, the present invention provides a method for performing in-mold foaming by electron crosslinking, which performs electron bridging by electron beam irradiation instead of chemical bridging by using a crosslinking agent, so as to eliminate the harm of organic chemical substances contained in the crosslinking agent, reduce the manufacturing cost of adding the crosslinking agent, and shorten the testing time of the bridging reaction condition of the foaming material. The process of electron beam irradiation for electron bridging is simple and fast, the physical properties of the foaming material can be improved, and the foaming uniformity is better. Furthermore, the at least one foaming piece is foamed in the mould, so that waste materials can be avoided, and unnecessary waste can be reduced.
Claims (9)
1. A method for in-mold foaming by electron crosslinking, comprising the steps of:
pressing at least one foaming material into at least one foaming piece;
irradiating the at least one foaming piece by electron beams;
placing the at least one foaming piece irradiated by the electron beam into a mold; and
and heating and foaming the at least one foaming piece in the mold.
2. The method of claim 1, wherein the at least one foaming material is ethylene vinyl acetate copolymer, metallocene, ethylene propylene diene monomer, polystyrene, nitrile rubber, styrene butadiene rubber, diene elastomer, thermoplastic polyurethane elastomer, polyolefin elastomer, thermoplastic elastomer, or a combination of two or more thereof.
3. The method for in-mold foaming using electronic crosslinking according to claim 1, wherein a bridging aid is added in the step of pressing at least one foaming material into at least one foamed member.
4. The method of claim 3, wherein the at least one foaming material is polyethylene, polypropylene, ethylene vinyl acetate copolymer, metallocene, ethylene propylene diene monomer, polystyrene, nitrile rubber, styrene butadiene rubber, diene elastomer, thermoplastic polyurethane elastomer, polyolefin elastomer, thermoplastic elastomer, or a combination of two or more thereof.
5. The method of claim 1, wherein the at least one foaming material is in the form of particles, flakes, plates, powders or bars during the step of pressing the at least one foaming material into the at least one foaming member.
6. The method for in-mold foaming using electron crosslinking according to claim 1, wherein the electron beam irradiation dose in the step of irradiating the at least one foamed member with the electron beam is 400kv to 2000 kv.
7. The method for in-mold foaming using electron crosslinking according to claim 1, wherein in the step of irradiating the at least one foamed member with the electron beam, the electron beam irradiation depth is 3KGY to 60 KGY.
8. The method for in-mold foaming using electronic crosslinking according to claim 1, wherein the at least one foamed member has a cell diameter of 0.002mm to 0.4mm after the step of heat foaming the at least one foamed member in the mold.
9. The method for in-mold foaming using electronic crosslinking according to claim 1, wherein the at least one foaming member has a bridging linkage ratio of 10% to 80% after the step of heat foaming the at least one foaming member in the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810736223.2A CN110682493A (en) | 2018-07-06 | 2018-07-06 | Method for in-mold foaming by electronic crosslinking |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810736223.2A CN110682493A (en) | 2018-07-06 | 2018-07-06 | Method for in-mold foaming by electronic crosslinking |
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| CN110682493A true CN110682493A (en) | 2020-01-14 |
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| CN201810736223.2A Pending CN110682493A (en) | 2018-07-06 | 2018-07-06 | Method for in-mold foaming by electronic crosslinking |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296510A (en) * | 1999-03-16 | 2001-05-23 | 三井化学株式会社 | Crosslinkable rubber composition and use thereof |
| CN106674581A (en) * | 2015-11-11 | 2017-05-17 | 良澔科技企业股份有限公司 | Foaming body without residual formamide and preparation method thereof |
-
2018
- 2018-07-06 CN CN201810736223.2A patent/CN110682493A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296510A (en) * | 1999-03-16 | 2001-05-23 | 三井化学株式会社 | Crosslinkable rubber composition and use thereof |
| CN106674581A (en) * | 2015-11-11 | 2017-05-17 | 良澔科技企业股份有限公司 | Foaming body without residual formamide and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 陈文贵 等: "《中国消防全书》", 31 October 1993, 吉林人民出版社 * |
| 黄锐 等: "《塑料工程手册 上册》", 30 April 2000, 机械工业出版社 * |
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