CN109912877B - High-temperature-resistant anti-aging EVA (ethylene-vinyl acetate copolymer) foam material as well as preparation method and application thereof - Google Patents
High-temperature-resistant anti-aging EVA (ethylene-vinyl acetate copolymer) foam material as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a high-temperature-resistant anti-aging EVA (ethylene vinyl acetate) foaming material as well as a preparation method and application thereof, wherein the foaming material is prepared by foaming an EVA composite material, and the EVA composite material comprises the following components: 40-50 parts of EVA; 10-55 parts of AEM rubber; 10-20 parts of a polyolefin elastomer; 10-20 parts of an ethylene-octene block copolymer; 0.5-0.8 part of peroxide crosslinking agent; 3-5 parts of a foaming agent; 1-4 parts of an active agent; 3-12 parts of a reinforcing agent. The thermal shrinkage rate of the foaming material disclosed by the embodiment of the invention is 0.6-1%, which is lower than that of the traditional EVA foaming material. After the foaming material is aged by hot air, the change rate of permanent compression deformation, the change rate of mechanical property and the change rate of hardness are all lower than 20%, the original properties of the material are well maintained, and the high-temperature resistance and ageing resistance are good. And the material has low processing temperature, and is beneficial to subsequent lamination.
Description
Technical Field
The invention relates to the technical field of shoe product materials, in particular to a high-temperature-resistant anti-aging EVA (ethylene-vinyl acetate copolymer) foaming material as well as a preparation method and application thereof.
Background
The sole of the sports shoe is generally composed of an outsole and a midsole, wherein the outsole is a layer structure directly contacting with the ground, is generally made of natural rubber or artificial rubber, and has the functions of skid resistance, wear resistance, bending resistance and the like. The midsole is generally the structure between the insole and the outsole, and mainly plays a role in supporting or rebounding. Currently, midsoles are foamed structures that are mainly made of thermoplastic elastomer materials such as Ethylene Vinyl Acetate (EVA), styrene thermoplastic elastomers (SBS), ethylene Octene Block Copolymers (OBC), Thermoplastic Polyurethanes (TPU), and the like.
The conventional EVA foaming material is mainly prepared by blending and foaming EVA, POE, EPDM (ethylene propylene diene monomer), SEBS and other materials. In a hot air state, EVA, POE, EPDM, SEBS and the like are low-melting-point polymers, and the polymers are transformed from a glass state to a high-elastic state at a high temperature and softened, so that the conventional EVA foaming material is subjected to large thermal shrinkage, and then various phenomena such as poor mechanical properties, increased compression set and the like occur, and great obstacles and limitations are provided for subsequent production and use.
The existing conventional improvement method generally introduces high-temperature-resistant low-shrinkage polyolefin block copolymer (OBC) into an EVA foaming system. Although the problem of product shrinkage can be improved by the improvement, the melting point of the OBC is 120 ℃, the processing temperature is high, the OBC is difficult to process, and the OBC is a nonpolar polymer, so that the addition amount is large, and the subsequent laminating process of the midsole material is not facilitated.
Disclosure of Invention
In view of this, the present application provides a high temperature resistant anti-aging EVA foam material, and a preparation method and an application thereof, and the EVA foam material provided by the present invention has excellent high temperature resistant anti-aging property, and is low in processing temperature, and is beneficial to subsequent bonding.
The invention provides a high-temperature-resistant anti-aging EVA (ethylene vinyl acetate) foaming material which is prepared by foaming an EVA composite material, wherein the EVA composite material comprises the following components in parts by weight:
40-50 parts of ethylene-vinyl acetate copolymer;
10-55 parts of AEM rubber;
10-20 parts of a polyolefin elastomer;
10-20 parts of an ethylene-octene block copolymer;
0.5-0.8 part of peroxide crosslinking agent;
3-5 parts of a foaming agent;
1-4 parts of an active agent;
3-12 parts of reinforcing agent.
Preferably, the EVA composite material comprises 30-50 parts of AEM rubber; the mass content of methyl acrylate in the AEM rubber is 8-40%.
Preferably, the mass content of VA in the ethylene-vinyl acetate copolymer is 18-28%.
Preferably, the peroxide crosslinking agent is one or more of dicumyl peroxide and 1, 4-bis-tert-butylperoxyisopropyl benzene.
Preferably, the foaming agent is one or more of azodicarbonamide, 4-oxydiphenylsulfonylhydrazide and a white foaming agent.
Preferably, the active agents include stearic acid, zinc stearate, and zinc oxide.
Preferably, the EVA composite material comprises 5-10 parts of a reinforcing agent; the reinforcing agent is white carbon black.
The invention provides a preparation method of the high-temperature-resistant anti-aging EVA foaming material, which comprises the following steps:
and sequentially mixing and granulating the EVA composite material, and then foaming to obtain the high-temperature-resistant anti-aging EVA foaming material.
The invention provides application of the high-temperature-resistant anti-aging EVA foaming material in preparation of a sports shoe sole.
Compared with the prior art, the high-temperature-resistant anti-aging EVA foaming material is prepared by foaming an EVA composite material, is mainly used as a midsole material of sports shoes, is mainly an ethylene vinyl acetate copolymer (EVA resin), introduces a certain proportion of AEM rubber with ultrahigh temperature resistance and aging resistance, and is prepared by combining POE, OBC and the like through chemical crosslinking foaming. The thermal shrinkage rate of the EVA foaming material disclosed by the embodiment of the invention is 0.6-1%, which is lower than that of the traditional EVA foaming material. Moreover, after the EVA foam material is aged in hot air at 150 ℃ for 6h, the change rate of permanent compression deformation, the change rate of mechanical property and the change rate of hardness are all lower than 20%, the original performance of the material is well maintained, and the EVA foam material has good high-temperature resistance and ageing resistance. Meanwhile, the introduced AEM rubber has polar ester-based side chains, so that the AEM rubber is favorably attached to a rubber bottom and the like; the addition of AEM rubber does not influence the processing operation performance of the EVA foaming material.
Drawings
FIG. 1 is a graph comparing the density change after heat aging of the foams described in examples and comparative examples;
FIG. 2 is a graph comparing the hardness change rates of the foams of examples and comparative examples after heat aging;
FIG. 3 is a graph comparing the tensile strength change after heat aging of the foamed materials of examples and comparative examples;
FIG. 4 is a graph comparing the rate of change of tear strength after heat aging of the foamed materials of examples and comparative examples;
FIG. 5 is a graph comparing the elongation at break change after heat aging of the foamed materials of examples and comparative examples;
FIG. 6 is a graph showing a comparison of the rebound change rates of the foams of examples and comparative examples after heat aging;
FIG. 7 is a graph showing a comparison of the rate of change in compression set of the foams of examples and comparative examples after heat aging.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, 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.
The invention provides a high-temperature-resistant anti-aging EVA (ethylene-vinyl acetate copolymer) foaming material which is prepared by foaming an EVA composite material, wherein the EVA composite material comprises the following components in parts by weight:
40-50 parts of ethylene-vinyl acetate copolymer;
10-55 parts of AEM rubber;
10-20 parts of a polyolefin elastomer;
10-20 parts of an ethylene-octene block copolymer;
0.5-0.8 part of peroxide crosslinking agent;
3-5 parts of a foaming agent;
1-4 parts of an active agent;
3-12 parts of a reinforcing agent.
The EVA foaming material provided by the invention is mainly used as a shoe insole material, has excellent high-temperature resistance and ageing resistance, is low in processing temperature, and is beneficial to subsequent lamination. The invention can solve the defect that the traditional EVA foaming material is not high temperature resistant and ageing resistant, and solves the problems of poor bonding, low processing operability and the like of the conventional high temperature resistant EVA foaming material.
The EVA foaming material provided by the embodiment of the invention can be called as an EVA foaming midsole material and is prepared from an EVA composite material through a foaming process. The EVA composite material comprises 40-50 parts by mass of ethylene-vinyl acetate copolymer. The ethylene-vinyl acetate copolymer is also called ethylene-vinyl acetate copolymer, and is thermoplastic resin obtained by copolymerizing ethylene and Vinyl Acetate (VA), and the English name is EVA for short. The ethylene-vinyl acetate copolymer has the characteristics of high resilience and good flexibility; specifically, the mass content of VA in the ethylene-vinyl acetate copolymer can be 18-28%. Preferably, the ethylene-vinyl acetate copolymer can be in the following types: one or more of EVA 7350M, EVA 7360M, EVA 7470M, Elvax 460 and Elvax 265.
In the invention, the EVA composite material comprises: 10-20 parts of a polyolefin elastomer; 10-20 parts of an ethylene-octene block copolymer. OBC is the English abbreviation of ethylene-octene block copolymer, wherein the hard segment is high density polyethylene; the hard segment content of the ethylene octene block copolymer OBC is in the range of 20-30%, and the preferred varieties are as follows: infuse 9107, Infuse 9000, and the like.
Among them, Polyolefin elastomer (POE) is a thermoplastic elastomer with narrow relative molecular mass distribution and uniform short chain branch distribution synthesized by DOW chemical company in the united states using metallocene as a catalyst, has a structure in which rubber and resin are separated in two phases, and has the characteristics of small density, light weight, good tear strength, excellent rebound resilience, and the like. Preferably, the POE includes: the crystallinity is 15% -25%, and the particularly preferred varieties are: engage 8180, Engage 8150, Engage 8003, etc.
In the high-temperature-resistant anti-aging EVA foaming material in the prior art, if a nonpolar high-melting-point (120 ℃) olefin block copolymer OBC is adopted, the improvement effect is poor when the addition amount of the OBC is small, and if the addition amount is large, the processing operation performance is influenced by the high melting point of the OBC on the one hand, and the lamination is influenced by the nonpolar of the OBC on the other hand. If the nylon fiber is adopted for improvement, although the high-temperature resistance can be effectively improved, and the lamination is not influenced, the strong polarity and the high melting point of nylon cause poor compatibility and processing operability of the material.
The high-temperature-resistant anti-aging performance of the EVA foam material is improved mainly by adopting AEM rubber with excellent high-temperature-resistant anti-aging performance, good processing and operating performance and medium polarity. Ethylene acrylate rubber (AEM rubber for short) is an elastomer obtained by copolymerizing ethylene and acrylate as main monomers, wherein the main chain of the elastomer is a saturated carbon chain, and the side group of the elastomer is a polar ester group.
Because of the special structure of AEM rubber, it is endowed with many excellent features: (1) thermal aging resistance: the AEM can be continuously used for 18 months at 120 ℃ and for 6 weeks at 170 ℃ by taking the elongation at break reduced by 50% as a measurement standard; (2) compression set resistance: the AEM ternary rubber vulcanized by the amine vulcanizing agent or the peroxide has excellent compression permanent deformation resistance, and the compression permanent deformation is less than 20% under the condition of 170 ℃ for 70 h; (3) weather resistance, ozone resistance: the AEM rubber has excellent ozone resistance and good weather resistance, and almost has no change in appearance and physical properties after being exposed for 3 years; (4) cold resistance: the AEM rubber can be used at-40 ℃, and can keep soft at lower temperature if proper plasticizer is added; (5) liquid resistance: the AEM rubber has good resistance to automobile automatic steering fluid, gear oil, glycol/water mixed liquid, diesel oil, kerosene and the like. In the prior art, the application field of AEM rubber is mainly automobile accessories, such as front and rear crankshaft oil seals, front and rear main shaft oil seals, power steering pump seals, transmission pump seals, water pump seals, engine valve stem oil seals, CVJ dust covers, power steering rubber pipes and 175 ℃ grade radiator rubber pipes. In addition, the AEM rubber has better application prospect in the field of halogen-free low-smoke flame-retardant cable sheaths.
In the present invention, on the one hand, AEM rubber has excellent high temperature resistance, heat aging resistance, weather resistance, ozone resistance; on the other hand, the AEM rubber has a moderate ester side chain polarity, so that the AEM rubber has good compatibility with EVA/POE/OBC and the like, and the polar ester group is beneficial to bonding. Furthermore, the AEM rubber belongs to rubber, can be mixed at normal temperature, has low processing temperature and moderate Mooney viscosity, and does not influence the processing operation performance by the addition amount. In the processing process of materials such as EVA and the like, the processing temperature of banburying, open milling and single-screw granulation mixing is generally lower than 100 ℃, and too high temperature easily causes premature decomposition of a foaming agent and a crosslinking agent to cause foaming abnormality, so that the AEM rubber has low processing temperature and better operability compared with OBC and nylon fiber.
The EVA composite material comprises 10-55 parts by mass of AEM rubber, and preferably comprises 30-50 parts. Specifically, the mass content of methyl acrylate in the AEM rubber can be 8-40%; the Mooney viscosity is 22-29 [ ML (1+4) at 100 ℃). Preferred varieties in the embodiments of the present invention are: vamac Ultra IP, Vamac DP, etc., from DuPont. According to the embodiment of the invention, ethylene-acrylate copolymer (AEM rubber) with methyl acrylate content of 8-40%, ethylene-vinyl acetate (EVA), polyolefin elastomer (POE), ethylene Octene Block Copolymer (OBC) and the like are introduced, and the high-temperature-resistant and anti-aging foaming material is obtained through chemical crosslinking foaming.
In addition, the invention improves the strength of AEM rubber and the like (the AEM rubber is non-self-reinforcing rubber and has poorer strength than EVA/POE/OBC and the like) by adding a certain amount of reinforcing agent, so the invention has the advantages of improving the strength of AEM rubber and the likeHas excellent high temperature resistance and still maintains better strength. In the invention, the EVA composite material comprises 3-12 parts of reinforcing agent, preferably 5-10 parts of reinforcing agent. The reinforcing agent is preferably white carbon black; the BET specific surface area of the white carbon black can be 100-300m2(g) mainly means a BET specific surface area of 100-300m2Precipitated silica and fumed silica in a/g ratio, preferably white carbon WL180 from the Woundplast company.
In order to obtain a cross-linked EVA foam material with good performance, the composite material of the embodiment of the invention comprises: 0.5-0.8 part of peroxide crosslinking agent; 3-5 parts of foaming agent. The EVA composite material preferably comprises 0.6-0.8 part of peroxide cross-linking agent; the peroxide crosslinking agent is preferably one or more of dicumyl peroxide (DCP) and 1, 4-di-tert-butylperoxyisopropyl benzene (BIPB). Specifically, the preferred species of crosslinking agent are: DCP PERKADOX BC-FF, DCP LUPEROX DC; BIBP PERKADOX 14S-FL, BIPB F-Flakes, etc.
The amount of the foaming agent is preferably 3 to 4 parts by weight. The blowing agent may include: one or more of azodicarbonamide, 4-oxodiphenylsulfonylhydrazide and a white blowing agent, preferably an azo-based blowing agent, such as AC 6000H.
In the invention, the EVA composite material comprises 1-4 parts of an active agent, and plays roles in promoting foaming, crosslinking and the like. In specific embodiments of the invention, the active agents include stearic acid, zinc stearate, and zinc oxide; for example, the zinc oxide is 0.9 to 1.3 parts, preferably 1 to 1.2 parts, the stearic acid is 0.9 to 1.3 parts, preferably 1 to 1.2 parts, and the zinc stearate is 0.9 to 1.3 parts, preferably 1 to 1.2 parts. The invention has no special limitation on the source of each component, and corresponding commercial products in the field can be adopted; preferred classes of active agents are: stearic acid 1801, zinc stearate ZTE, ZnO 997.
According to the invention, the EVA composite material formula is adopted for foaming, and the adopted AEM rubber has excellent high temperature resistance, heat aging resistance, weather resistance and ozone resistance, so that the thermal shrinkage rate of the foam material is only 0.6-1%; the permanent compression deformation change rate, the mechanical property change rate and the hardness change rate are all lower than 20% at 150 ℃ for 6h, and the original properties of the material are well maintained. The AEM rubber used in the invention has low processing temperature, moderate Mooney viscosity and no influence on processing performance. The AEM rubber contains ester side chains with medium polarity, has good compatibility with EVA/POE/OBC and the like, and is beneficial to lamination.
The embodiment of the invention provides a preparation method of the high-temperature-resistant anti-aging EVA foaming material, which comprises the following steps:
and sequentially mixing and granulating the EVA composite material, and then foaming to obtain the high-temperature-resistant anti-aging EVA foaming material.
The process flow of the embodiment of the invention mainly comprises the following steps: weighing → mixing → granulating → foaming → baking. The embodiment of the invention firstly carries out grouping and weighing: DCP and blowing agent can be weighed out as a first group according to the dosage of the formula; weighing stearic acid, zinc stearate and zinc oxide as a second group; the remaining material was weighed out for the third group.
The embodiment of the invention mixes the weighed components: firstly, pouring the third group of materials into an internal mixer, starting the internal mixer, and pouring the second group of materials when the temperature is increased to 80-85 ℃; pouring the third group of materials when the temperature is raised to 90-95 ℃; when the temperature rises to 100-110 ℃, the mixed material is poured out.
The embodiment of the invention carries out granulation or material manufacturing on the mixed materials: the mixed material is poured into a material making machine, and the temperatures of the first zone, the second zone, the third zone and the fourth zone are respectively adjustable as follows: 75 deg.C, 80 deg.C, 85 deg.C, 90 deg.C. And adjusting the rotation speed of the screw to 40-50 rpm, and adjusting the rotation speed of the cutting material to 15-20 rpm. If water ring/underwater granulation is adopted in the material making process, dehydration is carried out through a dehydrator (centrifuge), air cooling is carried out to continue cooling and dehydration, and the materials are collected after being screened through a vibrating screen; if air cooling is adopted, the air cooling can be directly used.
After granulation, the example of the invention foams the mixture obtained: pouring the manufactured materials into an injection foaming molding machine, feeding, wherein the temperatures of a first zone, a second zone, a third zone and a fourth zone can be respectively adjusted as follows: the temperature of the upper and lower templates of the forming die can be respectively adjusted to be 80 ℃, 85 ℃, 90 ℃ and 95 ℃: 170 ℃ and 170 ℃. The material amount is set according to the mold amount, and the vulcanizing time is generally 500-700 seconds.
Finally, the embodiment of the invention performs baking: the temperature of the first, second, third and fourth zones is adjusted as follows: 80 deg.C, 90 deg.C, 95 deg.C, 100 deg.C, and 60-70 rpm; feeding the foamed material into the mouth of an oven, wherein the length of the oven is preferably 30-40 meters; the baking time is preferably 30-40 minutes from beginning to end, and the high-temperature-resistant anti-aging EVA foaming material for the middle sole of the sports shoe is obtained.
The invention also provides the application of the high-temperature-resistant anti-aging EVA foaming material in the preparation of the sports shoe sole; namely, the sports shoe sole comprises a middle sole made of the EVA foaming material. The invention is mainly used for manufacturing sports shoes, but is not limited to other kinds of shoes. The outer structure design of the sports sole is not particularly limited by the embodiment of the invention, and the conventional upper structure in the field can also be adopted. According to the EVA foaming material and the preparation method thereof, different formula combinations can be selected to meet the functional requirements of different products.
In order to further understand the present application, the high temperature resistant and anti-aging EVA foam material provided by the present application, the preparation method and the application thereof are specifically described below with reference to the examples.
Example 1
Weighing: DCP and blowing agent were weighed out as a first group according to the amounts of the formulations in table 1; weighing stearic acid, zinc stearate and zinc oxide as a second group; the remaining material was weighed out for the third group.
Mixing: firstly, pouring the third group of materials into an internal mixer, starting the internal mixer, and pouring the second group of materials when the temperature is increased to 80-85 ℃; pouring the third group of materials when the temperature is raised to 90-95 ℃; when the temperature rises to 100-110 ℃, the mixed material is poured out.
Material preparation: the mixed materials are poured into a material making machine, and the temperatures of the first zone, the second zone, the third zone and the fourth zone are respectively adjusted as follows: 75. 80, 85 and 90 ℃. And adjusting the rotation speed of the screw to 40-50 rpm, and adjusting the rotation speed of the cutting material to 15-20 rpm. In the material making process, water ring/underwater grain cutting is adopted, dehydration is carried out through a dehydrator (centrifugal machine), air cooling is carried out to continue cooling and dehydration, and the materials are collected after being screened through a vibrating screen.
Foaming: pouring the manufactured materials into an injection foaming molding machine, feeding, and respectively adjusting the temperatures of a first zone, a second zone, a third zone and a fourth zone as follows: 80. 85, 90 and 95 ℃, and the temperature of the upper and lower templates of the forming die are respectively adjusted as follows: 170. 170 deg.C. The material amount is set according to the using amount of the die, and the vulcanizing time is 600 seconds.
Baking: the temperature of the first, second, third and fourth zones is adjusted as follows: 80. 90, 95 and 100 ℃, and the rotating speed is 60-70 r/min; feeding the foamed material into an oven opening, wherein the length of the oven is 30 meters; and (3) baking for 30 minutes from beginning to end to obtain the high-temperature-resistant anti-aging EVA foam material.
Examples 2 to 6
According to the steps of example 1, the formula is shown in table 1, and the high-temperature-resistant anti-aging EVA foaming material is prepared respectively.
Comparative examples 1 to 2
According to the procedure of example 1, the general EVA foam materials were prepared according to the formulation shown in Table 1.
TABLE 1 specific formulations (in parts by mass) in inventive examples and comparative examples
Wherein, the raw materials of the examples and the comparative examples are as follows:
vamac Ultra IP: mooney viscosity 29[ ML (1+4) at 100 ℃, DuPont.
Vamac DP: mooney viscosity 22 [ ML (1+4) at 100 ℃, DuPont.
Elvax 265: VA (26 mass%), hardness 78A, melting point 73 ℃, DuPont company.
Elvax 460: VA 18% by mass, hardness 90A, melting point 88 ℃, DuPont company.
EVA 7350M: VA 18% by mass, hardness 90A, melting point 84 ℃, Tatai plastics Co.
EVA 7360M: VA 18% by mass, hardness 86A, melting point 80 ℃ and Tatai plastics Co.
EVA 7470M: VA 18% by mass, hardness 82A, melting point 76 ℃ and Tatai plastics.
Infuse 9107: hardness 60A, melting point 121 ℃, Dow chemical company.
Infuse 9000: hardness 71A, melting point 120 ℃ C.
Engage 8180: hardness 54A, melting point 47 ℃, Dow chemical company.
Engage 8150: hardness 70A, melting point 55 ℃, Dow chemical company.
Engage 8003: hardness 84A, melting point 77 ℃, Dow chemical company.
DCP: china petrochemical company.
Stearic acid 1801: indonedu Cudrada, Inc.
Zinc stearate ZTE: lake, new chemical Limited.
ZnO 997: the white stone zinc oxide has a relative density of 4.42-4.45.
Foaming agent AC 6000H: hangzhou Haihong Fine chemical Co., Ltd.
White carbon black WL 180: WindIng Degussa.
The EVA foam materials described in examples and comparative examples were subjected to performance tests, and the results are as follows.
TABLE 2 comparison of Performance data before and after Heat aging of examples and comparative examples
Remarking: the conditions of the high-temperature aging-resistant test carried out by the invention are as follows: and (3) placing the foaming material in an oven, setting the temperature of the oven at 100 ℃ and 150 ℃, and testing physical data after baking for 6 hours. Thickness of the sample: 10 mm.
The art generally requires material breaking; the laboratory tests the bonding strength between the foamed midsole and the rubber outsole, and whether the bonding strength is broken or not. If the insole material is broken, the adhesive has high bonding strength and is not easy to come unstuck, and the phenomenon is called material breakage. If the adhesive is broken between the two bases, the adhesive is poor in bonding strength and easy to come unstuck, and the adhesive is called as 'non-broken material'.
As shown in Table 2, the heat shrinkage of the high temperature resistant foamed material containing AEM rubber was 0.6% to 1% at the minimum. Whereas the conventional EVA foam (comparative example 1) without the addition of the high melting point OBC block copolymer had the maximum heat shrinkage of 2.5%; the heat shrinkage of the EVA foam to which the high melting point OBC block copolymer was added (comparative example 2) was centered at 1.8%. The comparison shows that the high temperature resistant ethylene-acrylate foaming material has the best high temperature resistant thermal shrinkage performance. In addition, the foaming of the invention is normal, and the abnormal phenomena such as layering, bubbling and the like do not exist.
See table 3 and figures 1-7 for specific property change rates after heat aging:
TABLE 3 comparison of the rate of change of properties after thermal aging of examples and comparative examples
As shown in Table 3, it was found that the conventional EVA foam (comparative example 1) to which no high-melting OBC block copolymer was added exhibited the highest rate of change in hot-air aging such as density, hardness, tensile strength, tear strength, elongation at break, rebound, compression set and the like, while the high-temperature resistant foam to which AEM rubber was added exhibited the lowest rate of change, and that the EVA foam (comparative example 2) to which a high-melting OBC block copolymer was added exhibited the middle rate of change in hot-air aging. After heat aging at 150 ℃ for 6h, the change rate of permanent compression set, the change rate of mechanical property and the change rate of hardness of the high-temperature-resistant ethylene-acrylate foam material of the invention are respectively higher than 32% and 27% in comparative example 1, and the change rate of the high-temperature-resistant ethylene-acrylate foam material of the invention is respectively lower than 20%, so that the original properties of the material are well maintained. The EVA foaming material provided by the invention has excellent high-temperature resistance and ageing resistance, is low in processing temperature, and is beneficial to subsequent bonding.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (7)
1. The high-temperature-resistant anti-aging EVA foaming material is characterized by being prepared by foaming an EVA composite material, wherein the EVA composite material comprises the following components in parts by weight:
40-50 parts of ethylene-vinyl acetate copolymer;
10-55 parts of AEM rubber;
10-20 parts of a polyolefin elastomer;
10-20 parts of an ethylene-octene block copolymer;
0.5-0.8 part of peroxide crosslinking agent;
3-5 parts of a foaming agent;
1-4 parts of an active agent; the active agent comprises stearic acid, zinc stearate and zinc oxide;
5-10 parts of a reinforcing agent; the reinforcing agent is white carbon black;
the polyolefin elastomer is POE with the crystallinity of 15 to 25 percent.
2. The high-temperature-resistant anti-aging EVA foam material of claim 1, wherein the EVA composite material comprises 30-50 parts of AEM rubber; the mass content of methyl acrylate in the AEM rubber is 8-40%.
3. The high-temperature-resistant anti-aging EVA foam material of claim 1, wherein the mass content of VA in the ethylene-vinyl acetate copolymer is 18-28%.
4. The high temperature and aging resistant EVA foam of claim 1, wherein the peroxide crosslinking agent is one or more of dicumyl peroxide and 1, 4-bis-tert-butylperoxyisopropyl benzene.
5. The high temperature and aging resistant EVA foam of claim 1, wherein the foaming agent is one or more of azodicarbonamide, 4-oxydiphenylsulfonylhydrazide, and a white foaming agent.
6. The preparation method of the high-temperature-resistant anti-aging EVA foaming material as claimed in any one of claims 1-5, comprising the following steps:
and sequentially mixing and granulating the EVA composite material, and then foaming to obtain the high-temperature-resistant anti-aging EVA foaming material.
7. Use of the high temperature resistant anti-aging EVA foam material of any one of claims 1 to 5 in the preparation of a sports shoe sole.
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