CN111909443A - Soft EVA (ethylene-vinyl acetate) particles and preparation method thereof - Google Patents
Soft EVA (ethylene-vinyl acetate) particles and preparation method thereof Download PDFInfo
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- CN111909443A CN111909443A CN202010845747.2A CN202010845747A CN111909443A CN 111909443 A CN111909443 A CN 111909443A CN 202010845747 A CN202010845747 A CN 202010845747A CN 111909443 A CN111909443 A CN 111909443A
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- parts
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- eva
- compatilizer
- pigment
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- 239000002245 particle Substances 0.000 title claims abstract description 44
- 239000005038 ethylene vinyl acetate Substances 0.000 title description 95
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 title description 95
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 title description 93
- 238000002360 preparation method Methods 0.000 title description 18
- 229920003023 plastic Polymers 0.000 claims abstract description 28
- 239000004033 plastic Substances 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000007822 coupling agent Substances 0.000 claims abstract description 23
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 239000004088 foaming agent Substances 0.000 claims abstract description 23
- 239000000049 pigment Substances 0.000 claims abstract description 23
- 239000012745 toughening agent Substances 0.000 claims abstract description 23
- 240000000491 Corchorus aestuans Species 0.000 claims abstract description 20
- 235000011777 Corchorus aestuans Nutrition 0.000 claims abstract description 20
- 235000010862 Corchorus capsularis Nutrition 0.000 claims abstract description 20
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 claims abstract description 20
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 20
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 20
- 239000008116 calcium stearate Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 235000012424 soybean oil Nutrition 0.000 claims abstract description 20
- 239000003549 soybean oil Substances 0.000 claims abstract description 20
- 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 18
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 9
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical group NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 5
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical group CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims description 5
- 239000004156 Azodicarbonamide Substances 0.000 claims description 5
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 5
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 5
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 5
- -1 compatilizer Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 229960001124 trientine Drugs 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 239000008187 granular material Substances 0.000 description 32
- 238000012216 screening Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 8
- 238000003756 stirring Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 235000019580 granularity Nutrition 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
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- 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
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- 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
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- C08J9/0014—Use of organic additives
- C08J9/0028—Use of organic additives containing nitrogen
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J9/0014—Use of organic additives
- C08J9/0042—Use of organic additives containing silicon
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- 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
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C08J9/0066—Use of inorganic compounding ingredients
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- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
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- 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
- C08J2423/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
- C08J2423/28—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds
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- C08J2483/04—Polysiloxanes
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- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
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- Polymers & Plastics (AREA)
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Abstract
The invention discloses a soft EVA particle, which comprises the following raw materials in proportion range: 80-150 parts of EVA plastic, 3-12 parts of jute fiber, 5-12 parts of epoxidized soybean oil, 5-15 parts of calcium stearate, 6-13 parts of barium stearate, 5-15 parts of talcum powder, 0-15 parts of pigment, 2-9 parts of wear-resisting agent, 5-15 parts of toughening agent, 2-6 parts of compatilizer, 3-7 parts of foaming agent, 1-5 parts of coupling agent and 2-5 parts of cross-linking agent.
Description
Technical Field
The invention relates to the technical field of EVA particle preparation, in particular to a soft EVA particle and a preparation method thereof.
Background
In the fields of chemistry and organic chemical industry, EVA refers to an ethylene-vinyl acetate copolymer and a rubber-plastic foam material prepared from the ethylene-vinyl acetate copolymer, has a molecular formula of (C2H4) x. (C4H6O2) y, is used for manufacturing refrigerator guide pipes, gas pipes, civil engineering plates, containers, daily necessities and the like, and is widely used for soles and foaming shock absorption at present;
but EVA granule in the existing market causes its compliance not enough because external influence in the preparation, can't further improve shock attenuation effect to the further problem that improves the comfort level of foot.
Disclosure of Invention
The invention provides a soft EVA particle and a preparation method thereof, which can effectively solve the problems that the EVA particles in the current market have insufficient softness due to external influence in the preparation process, the shock absorption effect cannot be further improved, and the comfort of feet cannot be further improved in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a soft EVA particle comprises the following raw materials:
EVA plastic, jute fiber, epoxidized soybean oil, calcium stearate, barium stearate, talcum powder, pigment, wear-resisting agent, toughening agent, compatilizer, foaming agent, coupling agent and crosslinking agent.
According to the technical scheme, the raw materials are in the following proportioning range: 80-150 parts of EVA plastic, 3-12 parts of jute fiber, 5-12 parts of epoxidized soybean oil, 5-15 parts of calcium stearate, 6-13 parts of barium stearate, 5-15 parts of talcum powder, 0-15 parts of pigment, 2-9 parts of wear-resisting agent, 5-15 parts of toughening agent, 2-6 parts of compatilizer, 3-7 parts of foaming agent, 1-5 parts of coupling agent and 2-5 parts of crosslinking agent.
According to the technical scheme, the raw materials are as follows: 125 parts of EVA plastic, 7 parts of jute fiber, 9 parts of epoxidized soybean oil, 11 parts of calcium stearate, 12 parts of barium stearate, 7 parts of talcum powder, 5 parts of pigment, 6 parts of wear-resisting agent, 11 parts of toughening agent, 5 parts of compatilizer, 4 parts of foaming agent, 2 parts of coupling agent and 3 parts of crosslinking agent.
According to the technical scheme, the pigment is a mixed color of three primary colors;
the wear-resisting agent is silicone oil;
the toughening agent is chlorinated polyethylene;
the compatilizer is grafted by maleic anhydride;
the foaming agent is azodicarbonamide;
the coupling agent is mercaptopropyl trimethoxysilane;
the cross-linking agent is triethylene tetramine.
According to the technical scheme, the EVA plastic is powdery.
According to the technical scheme, the preparation method of the soft EVA particles comprises the following steps:
s1, preheating and drying the EVA plastic, adding jute fiber, epoxidized soybean oil, calcium stearate, barium stearate and talcum powder, and continuing to heat;
s2, heating, adding the pigment, the wear-resistant agent, the toughening agent, the compatilizer, the foaming agent, the coupling agent and the crosslinking agent, and mixing;
s3, guiding the mixture into an internal mixer after mixing is finished, and carrying out heat preservation and internal mixing;
s4, after banburying is finished, the mixture is led out of a granulator, granulated and cooled;
and S5, cooling, classifying, detecting after classification, and packaging after qualified detection.
According to the technical scheme, the preheating temperature of the EVA plastic in the S1 is 75-85 ℃, and the preheating time is 5-10 min;
and in the step S1, the continuous heating temperature is 80-90 ℃, and the preheating time is 3-7 min.
According to the technical scheme, the mixture in the S2 is stirred by a stirrer, the speed of a stirring motor is 2500-.
According to the technical scheme, the temperature of an internal mixer in the S3 is 95-110 ℃, and the internal mixing heat preservation time is 10-15 min.
According to the technical scheme, the test items in the S5 are flexibility, strength and oxidizability.
Compared with the prior art, the invention has the beneficial effects that: the invention has scientific and reasonable structure and safe and convenient use:
1. the toughness of the EVA particles is increased by the jute fibers, the lubricating effect in the preparation of the EVA particles is improved by matching with the epoxidized soybean oil, and the high temperature resistance and the demolding property in the preparation are further improved by the calcium stearate and the barium stearate, so that the normal preparation is facilitated, and the flexibility, the strength and the oxidability are also improved.
2. Through sorting out the notch, agree with the spout, select separately the sieve, the screening graticule mesh can be selected separately the processing to the inside EVA granule of sorting sieve section of thick bamboo with lower hopper at the in-process that the refining auger carried to screen the graticule mesh through three different specifications and come the EVA granule to carry out a lot of sorting, make the EVA particle after selecting separately can guarantee the granularity even in the at utmost, improved the screening effect of EVA granule, thereby make things convenient for the use of follow-up EVA granule.
3. Through gomphosis cavity, supporting spring, pressure-bearing spring, touch switch, warning light and categorised collecting box convenience with the EVA granule of the different granularities after sorting separately categorised the collection to this makes things convenient for follow-up transportation to the EVA granule, uses through the cooperation of touch switch and warning light simultaneously when collecting to conveniently in time remind the staff to fall the material, prevents that the EVA granule from collecting overfilling and overflowing, reduces the degree of difficulty of artifical collection with this.
4. Through the installing support, the activity pivot, the screw delivery leaf, cooling jacket, water-cooling cavity and sealed lid can cool off the EVA granule before the EVA granule after the granulation is handled gets into to select separately a sieve section of thick bamboo, prevent that the EVA granule is inside to carry the heat and to lead to making the EVA granule produce the deformation when selecting separately, and reduce the sorting effect of EVA granule, in addition after the EVA granule gets into the inlet pipe, can prolong the time of EVA granule in the inlet pipe through the screw delivery leaf, with this guarantee that the EVA granule can be in the inlet pipe by abundant even cooling.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a cross-sectional view of a sizing screen cartridge of the present invention;
figure 4 is a schematic view of the construction of a sorting screen deck of the present invention;
FIG. 5 is a schematic view of the mounting structure of the spiral conveying blade of the present invention;
FIG. 6 is a schematic view of the internal structure of the support base according to the present invention;
reference numbers in the figures: 1. a sorting screen drum; 2. a drive motor; 3. a rotating shaft; 4. a material homogenizing screw conveyor; 5. an end cap; 6. a sorting slot; 7. a fit sliding chute; 8. sorting sieve plates; 9. screening grids; 10. feeding a hopper; 11. a supporting seat; 12. a fitting chamber; 13. a support spring; 14. a pressure-bearing spring; 15. a touch switch; 16. a warning light; 17. a classification collecting box; 18. a feed pipe; 19. mounting a bracket; 20. a movable rotating shaft; 21. a spiral conveying blade; 22. cooling the sleeve; 23. a water-cooled chamber; 24. and (7) sealing the cover.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1:
as shown in fig. 1, the present invention provides a technical solution, a soft EVA particle, comprising the following raw materials:
EVA plastic, jute fiber, epoxidized soybean oil, calcium stearate, barium stearate, talcum powder, pigment, wear-resisting agent, toughening agent, compatilizer, foaming agent, coupling agent and crosslinking agent.
According to the technical scheme, the raw materials are as follows: 125 parts of EVA plastic, 7 parts of jute fiber, 9 parts of epoxidized soybean oil, 11 parts of calcium stearate, 12 parts of barium stearate, 7 parts of talcum powder, 5 parts of pigment, 6 parts of wear-resisting agent, 11 parts of toughening agent, 5 parts of compatilizer, 4 parts of foaming agent, 2 parts of coupling agent and 3 parts of crosslinking agent.
According to the technical scheme, the pigment is a mixed color of three primary colors;
the wear-resisting agent is silicone oil;
the toughening agent is chlorinated polyethylene;
the compatilizer is grafted by maleic anhydride;
the foaming agent is azodicarbonamide;
the coupling agent is mercaptopropyl trimethoxysilane;
the cross-linking agent is triethylenetetramine.
According to the technical scheme, the EVA plastic is powdery.
According to the technical scheme, the preparation method of the soft EVA particles comprises the following steps:
s1, preheating and drying the EVA plastic, adding jute fiber, epoxidized soybean oil, calcium stearate, barium stearate and talcum powder, and continuing to heat;
s2, heating, adding the pigment, the wear-resistant agent, the toughening agent, the compatilizer, the foaming agent, the coupling agent and the crosslinking agent, and mixing;
s3, guiding the mixture into an internal mixer after mixing is finished, and carrying out heat preservation and internal mixing;
s4, after banburying is finished, the mixture is led out of a granulator, granulated and cooled;
and S5, cooling, classifying, detecting after classification, and packaging after qualified detection.
According to the technical scheme, the preheating temperature of the EVA plastic in the S1 is 75 ℃, and the preheating time is 7 min;
in S1, the temperature for continuous heating is 85 ℃, and the preheating time is 5 min.
According to the technical scheme, in the step S2, the mixture is stirred by a stirrer, the speed of a stirring motor is 3000r/min, and the stirring time is 5 min.
According to the technical scheme, the temperature of an internal mixer in S3 is 100 ℃, and the internal mixing heat preservation time is 12 min.
According to the above technical scheme, the test items in S5 are flexibility, strength and oxidation.
Example 2:
as shown in fig. 1, the present invention provides a technical solution, a soft EVA particle, comprising the following raw materials:
EVA plastic, jute fiber, epoxidized soybean oil, calcium stearate, barium stearate, talcum powder, pigment, wear-resisting agent, toughening agent, compatilizer, foaming agent, coupling agent and crosslinking agent.
According to the technical scheme, the raw materials are as follows: 135 parts of EVA plastic, 6 parts of jute fiber, 5 parts of epoxidized soybean oil, 5 parts of calcium stearate, 12 parts of barium stearate, 7 parts of talcum powder, 5 parts of pigment, 6 parts of wear-resisting agent, 11 parts of toughening agent, 3 parts of compatilizer, 3 parts of foaming agent, 2 parts of coupling agent and 3 parts of crosslinking agent.
According to the technical scheme, the pigment is a mixed color of three primary colors;
the wear-resisting agent is silicone oil;
the toughening agent is chlorinated polyethylene;
the compatilizer is grafted by maleic anhydride;
the foaming agent is azodicarbonamide;
the coupling agent is mercaptopropyl trimethoxysilane;
the cross-linking agent is triethylenetetramine.
According to the technical scheme, the EVA plastic is powdery.
According to the technical scheme, the preparation method of the soft EVA particles comprises the following steps:
s1, preheating and drying the EVA plastic, adding jute fiber, epoxidized soybean oil, calcium stearate, barium stearate and talcum powder, and continuing to heat;
s2, heating, adding the pigment, the wear-resistant agent, the toughening agent, the compatilizer, the foaming agent, the coupling agent and the crosslinking agent, and mixing;
s3, guiding the mixture into an internal mixer after mixing is finished, and carrying out heat preservation and internal mixing;
s4, after banburying is finished, the mixture is led out of a granulator, granulated and cooled;
and S5, cooling, classifying, detecting after classification, and packaging after qualified detection.
According to the technical scheme, the preheating temperature of the EVA plastic in the S1 is 82 ℃, and the preheating time is 7 min;
in S1, the temperature for continuous heating is 90 ℃ and the preheating time is 5 min.
According to the technical scheme, in the step S2, the mixture is stirred by a stirrer, the speed of a stirring motor is 3000r/min, and the stirring time is 4 min.
According to the technical scheme, the temperature of an internal mixer in S3 is 100 ℃, and the internal mixing heat preservation time is 12 min.
According to the above technical scheme, the test items in S5 are flexibility, strength and oxidation.
Example 3:
as shown in fig. 1, the present invention provides a technical solution, a soft EVA particle, comprising the following raw materials:
EVA plastic, jute fiber, epoxidized soybean oil, calcium stearate, barium stearate, talcum powder, pigment, wear-resisting agent, toughening agent, compatilizer, foaming agent, coupling agent and crosslinking agent.
According to the technical scheme, the raw materials are as follows: 110 parts of EVA plastic, 10 parts of jute fiber, 5 parts of epoxidized soybean oil, 10 parts of calcium stearate, 7 parts of barium stearate, 7 parts of talcum powder, 5 parts of pigment, 6 parts of wear-resisting agent, 11 parts of toughening agent, 5 parts of compatilizer, 4 parts of foaming agent, 2 parts of coupling agent and 3 parts of crosslinking agent.
According to the technical scheme, the pigment is a mixed color of three primary colors;
the wear-resisting agent is silicone oil;
the toughening agent is chlorinated polyethylene;
the compatilizer is grafted by maleic anhydride;
the foaming agent is azodicarbonamide;
the coupling agent is mercaptopropyl trimethoxysilane;
the cross-linking agent is triethylenetetramine.
According to the technical scheme, the EVA plastic is powdery.
According to the technical scheme, the preparation method of the soft EVA particles comprises the following steps:
s1, preheating and drying the EVA plastic, adding jute fiber, epoxidized soybean oil, calcium stearate, barium stearate and talcum powder, and continuing to heat;
s2, heating, adding the pigment, the wear-resistant agent, the toughening agent, the compatilizer, the foaming agent, the coupling agent and the crosslinking agent, and mixing;
s3, guiding the mixture into an internal mixer after mixing is finished, and carrying out heat preservation and internal mixing;
s4, after banburying is finished, the mixture is led out of a granulator, granulated and cooled;
and S5, cooling, classifying, detecting after classification, and packaging after qualified detection.
According to the technical scheme, the preheating temperature of the EVA plastic in the S1 is 85 ℃, and the preheating time is 10 min;
in S1, the temperature for continuous heating is 85 ℃, and the preheating time is 5 min.
According to the technical scheme, in the step S2, the mixture is stirred by a stirrer, the speed of a stirring motor is 3000r/min, and the stirring time is 4 min.
According to the technical scheme, the temperature of an internal mixer in S3 is 100 ℃, and the internal mixing heat preservation time is 15 min.
According to the above technical scheme, the test items in S5 are flexibility, strength and oxidation.
The EVA granules produced by examples 1-3 were compared and tabulated as follows:
the EVA particles prepared by the examples 1-3 can achieve the effect on flexibility and strength after comparison, but in the oxidative comparison, the example 3 slightly changes color, which may be caused by too long banburying time, resulting in oxidation and amplification in the reaction, the toughness of the EVA particles is increased by jute fibers, and the lubricating effect in the preparation of the EVA particles is improved by matching with epoxidized soybean oil, and the high temperature resistance and the demoulding property in the preparation are further improved by calcium stearate and barium stearate, so that the normal preparation is facilitated, and the flexibility, the strength and the oxidative property are also improved.
Example 4: as shown in figures 2-6, the invention provides a technical scheme, a rapid sorting device for EVA (ethylene vinyl acetate) preparation particles is used for sorting in step S5 and comprises a sorting screen cylinder 1, one end of the sorting screen cylinder 1 is fixedly connected with a driving motor 2, the input end of the driving motor 2 is electrically connected with the output end of an external power supply, one end of the driving motor 2 is rotatably connected with a rotating shaft 3 at the position at the inner side of the sorting screen cylinder 1, a material homogenizing auger 4 is spirally welded at the edge part of the rotating shaft 3, an end cover 5 is arranged at the position at the other end of the sorting screen cylinder 1 corresponding to the driving motor 2, one side of the top of the sorting screen cylinder 1 is connected with a feed pipe 18, sorting notches 6 are equidistantly arranged at the bottom at the inner side of the sorting screen cylinder 1, an engagement chute 7 is transversely arranged at the position corresponding to the sorting notches 6 in the sorting screen cylinder 1, a sorting sieve plate 8, the screening grid 9 is embedded and mounted on the inner side of the sorting sieve plate 8, the screening grid 9 is a stainless steel screen, three sorting notches 6 are formed, the number of the screening grid 9 is three, the positions of the three screening grid 9 correspond to the positions of the sorting notches 6, the aperture of the three screening grid 9 is gradually increased from left to right, EVA particles can be conveniently sorted through the three screening grid 9 with different aperture sizes, and meanwhile, the sorted EVA particles can be conveniently discharged and collected through the sorting notches 6;
the bottom of the sorting screen cylinder 1 and the corresponding position of the sorting notch 6 are fixedly connected with a blanking hopper 10, supporting seats 11 are arranged at the positions below the bottom of the sorting screen cylinder 1 and corresponding to the blanking hopper 10, an embedded cavity 12 is formed in each supporting seat 11, and supporting springs 13 are fixedly connected at each edge of the inner side of the embedded cavity 12;
the inboard bottom central point of gomphosis cavity 12 puts fixed mounting with pressure-bearing spring 14, pressure-bearing spring 14 inboard is located the inboard bottom point of gomphosis cavity 12 and puts fixed mounting with touch switch 15, warning light 16 is installed to 11 limit portion middle ends of supporting seat, touch switch 15 passes through the wire with warning light 16 and links to each other, the input of warning light 16 and touch switch 15's output electric connection, and touch switch 15's input and external power source's output electric connection, be convenient for drive warning light 16 through opening and closing of touch switch 15 and carry out the switch, the inboard embedding of gomphosis cavity 12 agrees with to be connected with categorised collecting box 17.
The bottom and the top of the inner side of the feeding pipe 18 are respectively provided with a mounting bracket 19, the inner sides of the two mounting brackets 19 are movably connected with a movable rotating shaft 20, the edge part of the movable rotating shaft 20 is spirally welded with a spiral conveying blade 21, the joint of the movable rotating shaft 20 and the two mounting brackets 19 is respectively provided with a movable connecting seat, the movable rotating shaft 20 is movably connected in the movable connecting seat, the surface of the spiral conveying blade 21 is provided with an inclined surface, which is convenient for the movable connection between the movable rotating shaft 20 and the two mounting brackets 19, make things convenient for the rotation of screw delivery leaf 21 simultaneously, cooling jacket 22 has been cup jointed in the 18 outsides of inlet pipe, and 18 limit of inlet pipe end is located the inboard position department of cooling jacket 22 and installs the metal sheet, and the 22 limit of cooling jacket is connected with the inlet tube, the heat that the inside EVA particle of quick subduction inlet pipe 18 of being convenient for carried, and cooling jacket 22 is inboard to have seted up water-cooling cavity 23, and cooling jacket 22 top is connected with sealed lid 24.
The working principle and the using process of the invention are as follows: in the practical application process of the rapid sorting device for preparing the EVA particles, the driving motor 2 is started firstly, and the rotating shaft 3 and the refining auger 4 are driven to rotate by the driving motor 2;
then, after the EVA particles are granulated, conveying the EVA particles into a feeding pipe 18, after the EVA particles enter the feeding pipe 18, driving a spiral conveying blade 21 in the feeding pipe 18 to rotate through gravity generated when the EVA particles fall down, so that the EVA particles can be conveyed only along the spiral conveying blade 21 in the feeding pipe 18, meanwhile, in the EVA particle conveying process, cooling water in a cooling sleeve 22 at the edge of the feeding pipe 18 is used for absorbing heat carried by the interior of the EVA particles after granulation, so that the temperature of the EVA particles is reduced, the phenomenon that the EVA particles deform in the subsequent sorting process is prevented, and in the cooling process, the conveying of the spiral conveying blade 21 is combined, so that the residence time of the EVA particles in the feeding pipe 18 is prolonged, and further, the EVA particles can be subjected to more sufficient and uniform cooling treatment;
when EVA granules pass through the inlet pipe 18, the EVA granules can directly enter the sorting screen cylinder 1, the cooled EVA granules are stirred by the refining auger 4 at the moment, and simultaneously the EVA granules are driven to be conveyed, in the conveying process, when the granularity of EVA granules accords with the screening grid 9 at the corresponding position at the bottom of the sorting screen cylinder 1, the EVA granules can fall into the corresponding blanking hopper 10 through the screening grid 9 at the corresponding position, so that the sorting of the EVA granules is completed, and because the screening grid 9 is provided with a plurality of grids, the EVA granules can be sorted for multiple times with different granularities, and further the sorting effect of the EVA granules is ensured;
after the EVA granule passes through its screening graticule mesh 9 that corresponds position department, carry the EVA granule to sorting screen section of thick bamboo 1 bottom in the categorised collecting box 17 through hopper 10 down, collect the EVA granule after sorting through categorised collecting box 17, and when the inside EVA granule of categorised collecting box 17 collected certain degree, the gravity that categorised collecting box 17 received at this moment just can increase gradually, supporting spring 13 and the pressure-bearing spring 14 of categorised collecting box 17 bottom just can produce deformation, after pressure-bearing spring 14 shrink, touch switch 15 just can be extruded to the bottom of categorised collecting box 17, touch switch 15's model is LX19K-B, and touch switch 15 opens the back, the warning light 16 of supporting seat 11 limit portion just can light, the model of warning light 16 is: JS-606-2AI-Q-G, so as to remind the staff to pour the material of the classified collection box 17 at the corresponding position in time, thereby reducing the difficulty of manual collection and avoiding the trouble of frequent manual check;
finally, after the EVA granule is selected separately, open end cover 5, then will select separately sieve 8 and pull out in agreeing with spout 7, and then make things convenient for people to clear up screening graticule mesh 9 fast convenient to remaining EVA granule bonds in screening graticule mesh 9, has reduced the degree of difficulty of artifical clearance, guarantees the effect that sorting unit selected separately next time.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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)
1. A soft EVA particle is characterized in that: the composite material comprises the following raw materials:
EVA plastic, jute fiber, epoxidized soybean oil, calcium stearate, barium stearate, talcum powder, pigment, wear-resisting agent, toughening agent, compatilizer, foaming agent, coupling agent and crosslinking agent.
2. The flexible EVA particle of claim 1, wherein the raw materials are in the following ratio range: 80-150 parts of EVA plastic, 3-12 parts of jute fiber, 5-12 parts of epoxidized soybean oil, 5-15 parts of calcium stearate, 6-13 parts of barium stearate, 5-15 parts of talcum powder, 0-15 parts of pigment, 2-9 parts of wear-resisting agent, 5-15 parts of toughening agent, 2-6 parts of compatilizer, 3-7 parts of foaming agent, 1-5 parts of coupling agent and 2-5 parts of crosslinking agent.
3. The flexible EVA particle of claim 1, wherein the raw material ratio is as follows: 125 parts of EVA plastic, 7 parts of jute fiber, 9 parts of epoxidized soybean oil, 11 parts of calcium stearate, 12 parts of barium stearate, 7 parts of talcum powder, 5 parts of pigment, 6 parts of wear-resisting agent, 11 parts of toughening agent, 5 parts of compatilizer, 4 parts of foaming agent, 2 parts of coupling agent and 3 parts of crosslinking agent.
4. The EVA particle of soft type according to claim 1, characterised in that the pigment is a mixture of three primary colours;
the wear-resisting agent is silicone oil;
the toughening agent is chlorinated polyethylene;
the compatilizer is grafted by maleic anhydride;
the foaming agent is azodicarbonamide;
the coupling agent is mercaptopropyl trimethoxysilane;
the cross-linking agent is triethylene tetramine.
5. The flexible EVA particles of claim 1, wherein the EVA plastic is in powder form.
6. A method for preparing EVA particles of soft type according to any of claims 1 to 5, comprising the steps of:
s1, preheating and drying the EVA plastic, adding jute fiber, epoxidized soybean oil, calcium stearate, barium stearate and talcum powder, and continuing to heat;
s2, heating, adding the pigment, the wear-resistant agent, the toughening agent, the compatilizer, the foaming agent, the coupling agent and the crosslinking agent, and mixing;
s3, guiding the mixture into an internal mixer after mixing is finished, and carrying out heat preservation and internal mixing;
s4, after banburying is finished, the mixture is led out of a granulator, granulated and cooled;
and S5, cooling, classifying, detecting after classification, and packaging after qualified detection.
7. The method of claim 6, wherein the preheating temperature of the EVA plastic in S1 is 75-85 ℃ and the preheating time is 5-10 min;
and in the step S1, the continuous heating temperature is 80-90 ℃, and the preheating time is 3-7 min.
8. The method as claimed in claim 6, wherein the mixing in S2 is performed by a mixer with a speed of 2500-.
9. The method for preparing flexible EVA particles of claim 6, wherein the temperature of the internal mixer in S3 is 95-110 ℃, and the mixing holding time is 10-15 min.
10. The method of claim 6, wherein the test items in S5 are softness, strength and oxidation.
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Application publication date: 20201110 |