CN112480521A - EVA anti-deformation sole, preparation method and foot arch protection anti-deformation sports shoes - Google Patents
EVA anti-deformation sole, preparation method and foot arch protection anti-deformation sports shoes Download PDFInfo
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- CN112480521A CN112480521A CN202011098702.XA CN202011098702A CN112480521A CN 112480521 A CN112480521 A CN 112480521A CN 202011098702 A CN202011098702 A CN 202011098702A CN 112480521 A CN112480521 A CN 112480521A
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- eva
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- foaming
- eva foaming
- bottom layer
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 255
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 255
- 238000005187 foaming Methods 0.000 claims abstract description 151
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920006124 polyolefin elastomer Polymers 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 16
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- 239000004088 foaming agent Substances 0.000 claims abstract description 14
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 12
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 12
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008117 stearic acid Substances 0.000 claims abstract description 12
- 239000011787 zinc oxide Substances 0.000 claims abstract description 12
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 51
- 239000004615 ingredient Substances 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 40
- 239000002245 particle Substances 0.000 claims description 19
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000010408 sweeping Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 7
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 6
- 239000004156 Azodicarbonamide Substances 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 2
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000004604 Blowing Agent Substances 0.000 claims 1
- 238000007906 compression Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000000386 athletic effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- C08J9/04—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
- C08J9/06—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 chemical blowing agent
- C08J9/10—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 chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/04—Plastics, rubber or vulcanised fibre
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/187—Resiliency achieved by the features of the material, e.g. foam, non liquid materials
-
- 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
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/0009—Producing footwear by injection moulding; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
- B29D35/14—Multilayered parts
- B29D35/142—Soles
-
- 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
- C08J9/0023—Use of organic additives containing oxygen
-
- 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
- C08J9/0095—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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- 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
- C08J2323/08—Copolymers of ethene
-
- 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
- C08J2423/08—Copolymers of ethene
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Emergency Medicine (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
The invention provides an EVA anti-deformation sole, a preparation method and foot arch protection anti-deformation sports shoes, wherein the EVA anti-deformation sole comprises an EVA foaming bottom layer and an EVA foaming top layer combined with the EVA foaming bottom layer, and the raw materials of the EVA foaming top layer comprise 82.5-87.5 parts by weight of ethylene-vinyl acetate copolymer, 12.5-17.5 parts by weight of polyolefin elastomer, 8-12 parts by weight of talcum powder, 0.4-0.6 part by weight of stearic acid, 0.8-1.2 parts by weight of zinc stearate, 1-2 parts by weight of zinc oxide, 0.2-0.8 part by weight of cross-linking agent and 2.5-3.5 parts by weight of foaming agent; the EVA foaming bottom layer is prepared from 82.5-87.5 parts by weight of ethylene-vinyl acetate copolymer, 22.5-27.5 parts by weight of polyolefin elastomer, 8-12 parts by weight of talcum powder, 0.4-0.6 part by weight of stearic acid, 0.8-1.2 parts by weight of zinc stearate, 1-2 parts by weight of zinc oxide, 0.2-0.8 part by weight of cross-linking agent and 2.5-3.5 parts by weight of foaming agent. The EVA anti-deformation sole can effectively support the arch of foot and prevent deformation and damage.
Description
Technical Field
The invention belongs to the technical field of shoe materials, and particularly relates to an EVA anti-deformation sole, a preparation method and a foot arch protecting anti-deformation sneaker.
Background
Sports has become an important part of people's lives, and as a result, sports shoes are not only comfortable, lightweight, and durable to wear, but also safe to wear. For the purpose of improving the performance of athletes and providing comfort and lightness for people to wear, sports shoes are required to be as light as possible and to maintain excellent mechanical properties.
Ethylene vinyl acetate copolymer (EVA) has good softness, toughness and workability, and its foamed material is generally used for a sole material of sports shoes. For example, EVA foam is molded directly into an athletic shoe sole or midsole. However, such sports shoe soles generally have a problem that the sole of the arch cannot be sufficiently protected, and the foot is deformed and damaged.
Disclosure of Invention
Therefore, the invention aims to provide an EVA anti-deformation sole, a preparation method and a foot arch protecting anti-deformation sports shoe, aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme.
The elasticity of the EVA foaming material can be improved by introducing polyolefin elastomer (POE) into the EVA foaming sole, the hardness of the EVA foaming material is increased along with the increase of the POE dosage, and the hardness of the EVA foaming sole is usually 55-60 asker.C. However, such materials still have relatively large compression set, are less resilient, do not effectively support the arch, and are prone to damage. The inventor of the application finds that the EVA foaming bottom layer with higher hardness and the EVA foaming top layer with lower hardness are combined with the EVA anti-deformation sole, can provide enough support, have small compression deformation and high rebound resilience, and can effectively prevent arch damage.
In a first aspect, the invention provides an EVA anti-deformation sole, wherein the EVA anti-deformation sole comprises an EVA foaming bottom layer and an EVA foaming top layer combined with the EVA foaming bottom layer, and raw materials of the EVA foaming top layer comprise 82.5-87.5 parts by weight of ethylene-vinyl acetate copolymer, 12.5-17.5 parts by weight of polyolefin elastomer, 8-12 parts by weight of talcum powder, 0.4-0.6 part by weight of stearic acid, 0.8-1.2 parts by weight of zinc stearate, 1-2 parts by weight of zinc oxide, 0.2-0.8 part by weight of cross-linking agent and 2.5-3.5 parts by weight of foaming agent; the EVA foaming bottom layer is prepared from 82.5-87.5 parts by weight of ethylene-vinyl acetate copolymer, 22.5-27.5 parts by weight of polyolefin elastomer, 8-12 parts by weight of talcum powder, 0.4-0.6 part by weight of stearic acid, 0.8-1.2 parts by weight of zinc stearate, 1-2 parts by weight of zinc oxide, 0.2-0.8 part by weight of cross-linking agent and 2.5-3.5 parts by weight of foaming agent.
According to the EVA anti-deformation sole provided by the invention, the hardness of the EVA foaming bottom layer is 70 +/-2.5 asker.C, and the hardness of the EVA foaming top layer is 50 +/-2.5 asker.C.
In the present invention, the hardness "asker.c" is a hardness measured by an ASKER rubber hardness meter made by japan.
According to the EVA anti-deformation sole provided by the invention, the thickness ratio of the EVA foaming bottom layer to the EVA foaming top layer is 1: 0.1-0.5. In some preferred embodiments, the thickness ratio of the EVA foamed bottom layer to the EVA foamed top layer is 1: 0.3-0.4.
According to the EVA anti-deformation sole provided by the invention, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 15-30 wt%, and the number average molecular weight is usually 800-5000 g/mol. For example, the ethylene vinyl acetate copolymer used in the present invention may be EVA7350M, EVA 7470 available from taiwan plastic company and EVA UE3330 available from taiwan.
According to the EVA anti-deformation sole provided by the invention, the polyolefin elastomer is an ethylene-octene copolymer. For example, the polyolefin elastomer may be POE8150 available from dupont dow, usa.
In some preferred embodiments, the raw materials of the EVA foamed top layer include 14-16 parts by weight of EVA7350M, 52-54 parts by weight of EVA 7470 and 14-16 parts by weight of EVA UE3330, and the amount of the ethylene-vinyl acetate copolymer in the EVA foamed top layer is 84-86 parts by weight.
In some preferred embodiments, the ethylene vinyl acetate copolymer in the raw material of the EVA foaming bottom layer is EVA7350M, and the amount is 84 to 86 parts by weight.
According to the EVA anti-deformation sole provided by the invention, the particle size of the talcum powder is 800-5000 meshes, preferably 1000-4000 meshes, and more preferably 2000-3000 meshes. Thus, the talcum powder with the particle size range is easy to mix and has good filling effect.
According to the EVA anti-deformation sole provided by the invention, the cross-linking agent suitable for the invention is di-tert-butylperoxyisopropyl benzene (BIPB).
According to the EVA anti-deformation sole provided by the invention, the foaming agent suitable for the EVA anti-deformation sole is azodicarbonamide (foaming agent AC).
According to the EVA anti-deformation sole provided by the invention, the EVA foaming bottom layer and the EVA foaming top layer are bonded through the adhesive.
The adhesive of the present invention has no particular requirement, and any adhesive known in the art for EVA foamed shoe soles may be used. For example, JL-6120EVA available from Polymer adhesive products, Inc.
In a second aspect, the invention provides a preparation method of an EVA anti-deformation sole, wherein the preparation method comprises the following steps:
s100, preparing an EVA foaming bottom layer, comprising:
s101, mixing ethylene-vinyl acetate copolymer, polyolefin elastomer, talcum powder, stearic acid, zinc stearate and zinc oxide which are raw materials of an EVA foaming bottom layer to form a first ingredient of the EVA foaming bottom layer;
s102, mixing the first ingredients of the EVA foaming bottom layer to 118-122 ℃ by using an internal mixer to obtain the mixed first ingredients of the EVA foaming bottom layer;
s103, mixing the raw material cross-linking agent and the foaming agent of the EVA foaming bottom layer to obtain a second ingredient of the EVA foaming bottom layer, adding the second ingredient into the first ingredient of the mixed EVA foaming bottom layer, and mixing at 115-118 ℃ to obtain a mixed EVA foaming bottom layer material;
s104, transferring the mixed EVA foaming bottom layer material into an open mill, and open milling at 70-80 ℃ to obtain an open-milled EVA foaming bottom layer material;
s105, putting the milled EVA foaming bottom layer material into a granulator for granulation to obtain EVA foaming bottom layer material particles;
s106, injecting the EVA foaming bottom layer material particles into a mold for foaming after the EVA foaming bottom layer material particles are injected by an injection machine, and obtaining an EVA foaming bottom layer after shaping;
s200, preparing an EVA foaming top layer, comprising the following steps:
s201, mixing ethylene-vinyl acetate copolymer, polyolefin elastomer, talcum powder, stearic acid, zinc stearate and zinc oxide which are used as raw materials of an EVA foaming top layer to form a first ingredient of the EVA foaming top layer;
s202, mixing the first ingredients of the EVA foaming top layer to 110-;
s203, mixing the raw material cross-linking agent and the foaming agent of the EVA foaming top layer to obtain a second ingredient of the EVA foaming top layer, adding the second ingredient into the first ingredient of the mixed EVA foaming top layer, and mixing at 110-115 ℃ to obtain a mixed EVA foaming top layer material;
s204, transferring the mixed EVA foaming top layer material into an open mill, and open milling at 70-80 ℃ to obtain the open-milled EVA foaming top layer material;
s205, putting the milled EVA foaming top layer material into a granulator for granulation to obtain EVA foaming top layer material particles;
s206, injecting the EVA foaming bottom and top material particles into a mold for foaming after the EVA foaming bottom and top material particles are injected by an injection machine, and obtaining an EVA foaming top layer after shaping;
s300, adhering the EVA foaming bottom layer and the EVA foaming top layer through an adhesive to obtain the EVA anti-deformation sole.
According to the invention, firstly, an internal mixer is used for mixing and batching, then, an open mill is used for open milling, granulation is carried out in a granulator, and secondary foaming process in a mould is carried out, so that the processing process is more accurate, the treatment efficiency is high, and the prepared EVA foaming bottom layer and EVA foaming top layer have uniform bubble structures, so that the EVA anti-deformation sole foot protection support performance is higher, and the anti-deformation effect is better.
In some embodiments, step S102 comprises: and (3) putting the first ingredient of the EVA foaming bottom layer into an internal mixer for mixing, carrying out first weight lifting hammer ash sweeping when the first ingredient of the EVA foaming bottom layer is mixed to 70 +/-2 ℃, continuously mixing to 90 +/-2 ℃, carrying out second weight lifting hammer ash sweeping, continuously mixing to 120 +/-2 ℃, and carrying out third weight lifting hammer.
Similarly, in some embodiments, step S202 comprises: and (3) putting the first ingredients of the EVA foaming top layer into an internal mixer for mixing, carrying out first weight-lifting hammer ash sweeping when the first ingredients of the EVA foaming top layer are mixed to 70 +/-2 ℃, continuously mixing to 90 +/-2 ℃, carrying out second weight-lifting hammer ash sweeping, continuously mixing to 112.5 +/-2.5 ℃, and carrying out third weight-lifting hammer.
In some embodiments, the screws of the pelletizer in step S105 and step S205 have temperatures at the front section, middle section, and die of 80 ± 1 ℃, and 85 ± 1 ℃, respectively.
In some embodiments, the thickness of the EVA foaming base material particles obtained in the steps S105 and S205 is 2-2.5 mm.
In some embodiments, the screw temperature of the injection machine in steps S106 and S206 is 70-80 ℃, and the mold temperature is 170-175 ℃. If the temperature of the mould is too high, the foaming can be caused in advance, and the foaming molding material has the risk of mould clamping deformation.
In some embodiments, the sizing in step S106 and step S206 is performed in 5 stages, with a first stage temperature of 85 + -1 deg.C, a second stage temperature of 80 + -1 deg.C, a third stage temperature of 70 + -2 deg.C, a fourth stage temperature of 60 + -2 deg.C, and a fifth stage temperature of 50 + -2 deg.C. So, can make sole (material) can be from high to low, relatively even temperature down natural cooling, the finished product comes out and is close the normal atmospheric temperature, and then can guarantee that the finished product control is in normal shrink scope, avoids the sole (material) of taking out to lead to the sole shrink and serious deformation because the difference in temperature that nature was placed is too big.
In a third aspect, the invention also provides foot arch protecting and deformation preventing sports shoes, wherein the foot arch protecting and deformation preventing sports shoes comprise the EVA deformation preventing soles.
Of course, the foot arch protection and deformation prevention sports shoe can also comprise structures such as an insole, a vamp and the like. The present invention does not require special structure such as a sockliner and an upper, and may employ structure known in the art.
The invention has the following advantages:
(1) the EVA anti-deformation sole can provide enough support, has small compression deformation and high rebound resilience, and can effectively prevent arch damage.
(2) According to the invention, firstly, an internal mixer is used for mixing and batching, then, an open mill is used for open milling, granulation is carried out in a granulator, and secondary foaming process in a mould is carried out, so that the processing process is more accurate, the treatment efficiency is high, and the prepared EVA foaming bottom layer and EVA foaming top layer have uniform bubble structures, so that the EVA anti-deformation sole foot protection support performance is higher, and the anti-deformation effect is better.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
Hardness of
The hardness of the EVA foam was measured using an ASKER rubber hardness tester manufactured in japan, and the unit thereof was designated as "asker.c".
Density of
According to standard HGThe density of the EVA foam is measured in the unit of Mg/m by the aid of/T2872-3。
DIN abrasion resistance
The wear resistance of the EVA foam material is measured according to the standard GB T9867-2008.
Rebound resilience
The resilience of EVA foam was measured according to ASTM D2632-2001.
Compression set
The compression set of the EVA foam was measured according to HG/T4806-.
Right angle tear strength
The right angle tear strength of the material was measured according to the standard GB/T10808-2008.
Folding endurance
The folding endurance of the material was measured according to the standard GB/T3903.1-2017.
Tensile strength
The tensile strength and elongation at break of the material were measured according to the standard GB/T10654-2001.
Example 1
The formulation of the EVA anti-deformation sole is shown in table 1.
TABLE 1 EVA anti-deformation sole formula
1. Preparing an EVA foaming bottom layer.
1.1 mixing the raw materials of the EVA foaming bottom layer, namely ethylene vinyl acetate copolymer (EVA 7350M), polyolefin elastomer (POE 8105), talcum powder, stearic acid, zinc stearate and zinc oxide to form a first ingredient of the EVA foaming bottom layer.
1.2, putting the first ingredient of the EVA foaming bottom layer into an internal mixer for mixing, carrying out first weight lifting hammer ash sweeping when the first ingredient of the EVA foaming bottom layer is mixed to 70 +/-2 ℃, continuously mixing to 90 +/-2 ℃, carrying out second weight lifting hammer ash sweeping, continuously mixing to 120 +/-2 ℃, and carrying out third weight lifting hammer to obtain the first ingredient of the EVA foaming bottom layer after mixing.
1.3 mixing the raw material cross-linking agent and the foaming agent of the EVA foaming bottom layer to obtain a second ingredient of the EVA foaming bottom layer, adding the second ingredient into the first ingredient of the mixed EVA foaming bottom layer, mixing at 116.5 +/-1.5 ℃, and discharging to obtain the mixed EVA foaming bottom layer material.
1.4 at the temperature of 75 +/-5 ℃, transferring the mixed EVA foaming bottom layer material to an open mill to be thickened for one time, accelerating cooling, wherein the thickness is about 10mm, the EVA foaming bottom layer material is bundled for one time, the thickness is about 0.8mm, the EVA foaming bottom layer material is thickened for one time, and the thickness is about 10mm, so that the mixed EVA foaming bottom layer material is obtained.
And 1.5, putting the milled EVA foaming bottom layer material into a granulator for granulation, wherein the temperatures of a screw of the granulator at the front section, the middle section and a die head are respectively 80 +/-1 ℃, 80 +/-1 ℃ and 85 +/-1 ℃, and the rotating speeds of the screw and a cutter are adjusted to obtain EVA foaming bottom layer material particles with the thickness of 2-2.5 mm.
1.6EVA foaming bottom material particles are uniformly stirred according to the ratio of the multiplying power (1.7) and are put into a material preparation barrel of an injection machine, and the temperature of a screw of the injection machine is 75 +/-5 ℃. Injecting the mixture into a mold with the temperature of 170-. And after about 350 seconds, automatically opening the die, taking out the die, putting the die into a thermostat for shaping, and carrying out shaping in 5 sections, wherein the temperature of the first section is 85 +/-1 ℃, the temperature of the second section is 80 +/-1 ℃, the temperature of the third section is 70 +/-2 ℃, the temperature of the fourth section is 60 +/-2 ℃, and the temperature of the fifth section is 50 +/-2 ℃, so that the EVA foaming bottom layer is obtained after shaping.
The hardness of the EVA foaming bottom layer is 70asker.C, and the density is 0.28Mg/m3. And observing the section of the EVA foaming bottom layer by adopting an SEM method, wherein the result shows that the foaming structure is uniform.
2. Preparing an EVA foamed top layer by adopting a method basically the same as the step 1, wherein the difference is as follows:
2.1 in the mixing of the first ingredient of the EVA foaming top layer, the weight is lifted for the second time, the ash is swept by the hammer, and the mixing is continued to 112.5 +/-2.5 ℃.
2.2 after adding the second ingredient of the EVA foaming top layer, mixing at 112.5 +/-2.5 ℃, and discharging to obtain the mixed EVA foaming top layer material.
The hardness of the prepared EVA foaming top layer is 50asker.C, and the density is 0.18Mg/m3. And observing the section of the EVA foaming top layer by adopting an SEM method, and displaying that the foaming structure is uniform.
3. And taking the EVA foaming bottom layer and the EVA foaming top layer out of the thermostat, coating a JL-6120EVA adhesive purchased from a polyethylene adhesive product company Limited for adhesion, putting the EVA adhesive into a wood model for shaping to keep the sole in the original shape, and taking out the EVA foaming top layer to obtain the EVA anti-deformation sole.
The thickness of the half sole and the thickness of the heel of the prepared EVA anti-deformation sole are respectively 13mm and 25 mm. The thicknesses of the EVA foamed bottom layer and EVA foamed top layer in steps 1 and 2 were adjusted, and the results are shown in table 2.
TABLE 2 EVA deformation-preventing sole
| Thickness ratio of EVA foaming top layer to EVA foaming top layer | |
| EVA anti-deformation sole 1 | 1:0.1 |
| EVA anti-deformation sole 2 | 1:0.3 |
| EVA anti-deformation sole 3 | 1:0.4 |
| EVA anti-deformation sole 4 | 1:0.5 |
Comparative example 1
The formula (parts by weight) of the EVA foamed sole is as follows: 85 parts of EVA7350M, 20 parts of POE 8105, 10.5 parts of talcum powder (3000 meshes), 0.5 part of stearic acid, 1 part of zinc stearate, 1.5 parts of zinc oxide, 0.5 part of crosslinking agent BIPB and 2.8 foaming agent AC.
Preparing EVA foamed sole according to the step 1 of the embodiment 1, taking out the EVA foamed sole from a thermostat, putting the EVA foamed sole into a wooden model for shaping to keep the original shape of the sole, and taking out the EVA foamed sole to obtain the EVA anti-deformation sole finished product with the hardness of 58asker.C and the density of 0.20Mg/m3. The section of the EVA foamed sole is observed by adopting an SEM method, and the result shows that the foamed structure is uniform.
Performance testing
The EVA foamed bottom layer 1 and EVA foamed top layer 1 in example 1 and the EVA foamed shoe soles prepared in comparative example 1 were tested for DIN abrasion resistance, tensile strength, right angle tear strength and folding endurance. The results show that they have DIN abrasion less than 120, tensile strength greater than 3MPa, right angle tear strength greater than 3.5MPa, and folding endurance of 8 ten thousand times without cracking at normal temperature. All meet the relevant requirements of the sports shoe sole.
The compression set and resilience of the EVA foamed bottom layer 1, the EVA foamed top layer 1, the EVA foamed shoe sole prepared in example 1, and the EVA foamed shoe sole prepared in comparative example 1 were characterized, and the results are shown in table 3.
TABLE 3 compression set and rebound resilience
| Compression set | Rebound resilience (%) | |
| EVA foamed bottom layer 1 | 1.3 | 48 |
| EVA foaming top layer 1 | 6.2 | 76 |
| EVA anti-deformation sole 1 | 3.1 | 63 |
| EVA anti-deformation sole 2 | 1.8 | 68 |
| EVA anti-deformation sole 3 | 2.0 | 72 |
| EVA anti-deformation sole 4 | 4.3 | 72 |
| Comparative example 1 | 5.7 | 59 |
As can be seen from table 3, the EVA deformation preventing shoe sole of the present invention has both excellent compression set resistance and resilience, can provide sufficient support, and can effectively prevent damage to the arch of the foot.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
- The EVA anti-deformation sole comprises an EVA foaming bottom layer and an EVA foaming top layer combined with the EVA foaming bottom layer, wherein the EVA foaming top layer is prepared from 82.5-87.5 parts by weight of ethylene-vinyl acetate copolymer, 12.5-17.5 parts by weight of polyolefin elastomer, 8-12 parts by weight of talcum powder, 0.4-0.6 part by weight of stearic acid, 0.8-1.2 parts by weight of zinc stearate, 1-2 parts by weight of zinc oxide, 0.2-0.8 part by weight of cross-linking agent and 2.5-3.5 parts by weight of foaming agent; the EVA foaming bottom layer is prepared from 82.5-87.5 parts by weight of ethylene-vinyl acetate copolymer, 22.5-27.5 parts by weight of polyolefin elastomer, 8-12 parts by weight of talcum powder, 0.4-0.6 part by weight of stearic acid, 0.8-1.2 parts by weight of zinc stearate, 1-2 parts by weight of zinc oxide, 0.2-0.8 part by weight of cross-linking agent and 2.5-3.5 parts by weight of foaming agent.
- 2. The EVA anti-deformation sole of claim 1, wherein the hardness of the EVA foam bottom layer is 70 + 2.5asker.C, and the hardness of the EVA foam top layer is 50 + 2.5 asker.C.
- 3. The EVA anti-deformation sole according to claim 1 or 2, wherein the thickness ratio of the EVA foamed bottom layer to the EVA foamed top layer is 1: 0.1-0.5, preferably 1: 0.3-0.4.
- 4. An EVA anti-deformation sole according to any one of claims 1 to 3, wherein the ethylene vinyl acetate copolymer has a vinyl acetate content of 15 to 30 wt%, and a number average molecular weight of typically 800 to 5000 g/mol;preferably, the ethylene vinyl acetate copolymer is one or more selected from EVA7350M, EVA 7470 and EVA UE 3330;preferably, the polyolefin elastomer is POE 8150;preferably, the raw materials of the EVA foamed top layer comprise 14-16 parts by weight of EVA7350M, 52-54 parts by weight of EVA 7470 and 14-16 parts by weight of EVA UE3330, and the amount of the ethylene-vinyl acetate copolymer in the EVA foamed top layer is 84-86 parts by weight;preferably, the ethylene-vinyl acetate copolymer in the raw materials of the EVA foaming underlayer is EVA7350M, and the using amount is 84-86 parts by weight.
- 5. The EVA anti-deformation sole according to any one of claims 1 to 4, wherein the particle size of the talcum powder is 800-5000 meshes, preferably 1000-4000 meshes, and more preferably 2000-3000 meshes;preferably, the crosslinking agent is di-tert-butylperoxyisopropyl benzene;preferably, the blowing agent is azodicarbonamide.
- 6. The EVA anti-deformation sole according to any one of claims 1 to 5, wherein the EVA foamed bottom layer and the EVA foamed top layer are bonded by an adhesive.
- 7. The method for preparing EVA anti-deformation shoe sole of any one of claims 1 to 6, wherein the method comprises the following steps:s100, preparing an EVA foaming bottom layer, comprising:s101, mixing ethylene-vinyl acetate copolymer, polyolefin elastomer, talcum powder, stearic acid, zinc stearate and zinc oxide which are raw materials of an EVA foaming bottom layer to form a first ingredient of the EVA foaming bottom layer;s102, mixing the first ingredients of the EVA foaming bottom layer to 118-122 ℃ by using an internal mixer to obtain the mixed first ingredients of the EVA foaming bottom layer;s103, mixing the raw material cross-linking agent and the foaming agent of the EVA foaming bottom layer to obtain a second ingredient of the EVA foaming bottom layer, adding the second ingredient into the first ingredient of the mixed EVA foaming bottom layer, and mixing at 115-118 ℃ to obtain a mixed EVA foaming bottom layer material;s104, transferring the mixed EVA foaming bottom layer material into an open mill, and open milling at 70-80 ℃ to obtain an open-milled EVA foaming bottom layer material;s105, putting the milled EVA foaming bottom layer material into a granulator for granulation to obtain EVA foaming bottom layer material particles;s106, injecting the EVA foaming bottom layer material particles into a mold for foaming after the EVA foaming bottom layer material particles are injected by an injection machine, and obtaining an EVA foaming bottom layer after shaping;s200, preparing an EVA foaming top layer, comprising the following steps:s201, mixing ethylene-vinyl acetate copolymer, polyolefin elastomer, talcum powder, stearic acid, zinc stearate and zinc oxide which are used as raw materials of an EVA foaming top layer to form a first ingredient of the EVA foaming top layer;s202, mixing the first ingredients of the EVA foaming top layer to 110-115 ℃ by using an internal mixer to obtain the first ingredients of the mixed EVA foaming top layer;s203, mixing the raw material cross-linking agent and the foaming agent of the EVA foaming top layer to obtain a second ingredient of the EVA foaming top layer, adding the second ingredient into the first ingredient of the mixed EVA foaming top layer, and mixing at 110-115 ℃ to obtain a mixed EVA foaming top layer material;s204, transferring the mixed EVA foaming top layer material into an open mill, and open milling at 70-80 ℃ to obtain the open-milled EVA foaming top layer material;s205, putting the milled EVA foaming top layer material into a granulator for granulation to obtain EVA foaming top layer material particles;s206, injecting the EVA foaming bottom and top material particles into a mold for foaming after the EVA foaming bottom and top material particles are injected by an injection machine, and obtaining an EVA foaming top layer after shaping;s300, adhering the EVA foaming bottom layer and the EVA foaming top layer through an adhesive to obtain the EVA anti-deformation sole.
- 8. The production method according to claim 7, wherein step S102 includes: putting the first ingredient of the EVA foaming bottom layer into an internal mixer for mixing, carrying out first weight lifting hammer ash sweeping when the first ingredient of the EVA foaming bottom layer is mixed to 70 +/-2 ℃, continuously mixing to 90 +/-2 ℃, carrying out second weight lifting hammer ash sweeping, continuously mixing to 120 +/-2 ℃, and carrying out third weight lifting hammer;preferably, step S202 includes: and (3) putting the first ingredients of the EVA foaming top layer into an internal mixer for mixing, carrying out first weight-lifting hammer ash sweeping when the first ingredients of the EVA foaming top layer are mixed to 70 +/-2 ℃, continuously mixing to 90 +/-2 ℃, carrying out second weight-lifting hammer ash sweeping, continuously mixing to 112.5 +/-2.5 ℃, and carrying out third weight-lifting hammer.
- 9. The production method according to claim 7 or 8, wherein the temperatures of the screws of the pelletizer in the front stage, the middle stage and the die in steps S105 and S205 are 80 ± 1 ℃, 80 ± 1 ℃ and 85 ± 1 ℃, respectively;preferably, the thickness of the EVA foaming bottom layer material particles obtained in the step S105 and the step S205 is 2-2.5 mm;preferably, the screw temperature of the injection machine in the steps S106 and S206 is 70-80 ℃, and the mold temperature is 170-175 ℃;preferably, the shaping in step S106 and step S206 is performed in 5 stages, wherein the temperature of the first stage is 85 + -1 deg.C, the temperature of the second stage is 80 + -1 deg.C, the temperature of the third stage is 70 + -2 deg.C, the temperature of the fourth stage is 60 + -2 deg.C, and the temperature of the fifth stage is 50 + -2 deg.C.
- 10. An arch-protecting and deformation-preventing sports shoe, wherein the arch-protecting and deformation-preventing sports shoe comprises the EVA deformation-preventing sole of any one of claims 1 to 6.
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