CN109694569B - Preparation method of soft skin-friendly slippers - Google Patents

Preparation method of soft skin-friendly slippers Download PDF

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CN109694569B
CN109694569B CN201811466041.4A CN201811466041A CN109694569B CN 109694569 B CN109694569 B CN 109694569B CN 201811466041 A CN201811466041 A CN 201811466041A CN 109694569 B CN109694569 B CN 109694569B
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parts
lower die
core
friendly
soft skin
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CN109694569A (en
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卢鑫
罗显发
丁思博
郑荣大
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Quanzhou Jinke Technology Co.,Ltd.
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Quanzhou Jinke Technology Detection Co ltd
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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
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B1/00—Footwear characterised by the material
    • A43B1/0009—Footwear characterised by the material made at least partially of alveolar or honeycomb material
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B1/00—Footwear characterised by the material
    • A43B1/14—Footwear characterised by the material made of plastics
    • 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
    • B29D35/0009—Producing footwear by injection moulding; Apparatus therefor
    • B29D35/0018—Moulds
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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    • C08J9/0023—Use of organic additives containing oxygen
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
    • 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
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • 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
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    • C08J2447/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2497/00—Characterised by the use of lignin-containing materials
    • C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/098—Metal salts of carboxylic acids

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  • Health & Medical Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Medicine (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Inorganic Chemistry (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

The invention relates to the technical field of shoe making processes, and provides a preparation method of soft skin-friendly slippers, wherein the low-melting-point polyamide of shoes made of indoor double-color casual shoes is modified, so that the polarity of the materials is improved, crystallization is reduced, the shrinkage can be effectively controlled, the compression deformation performance of the materials is improved, and the rubber has good hand feeling and high comfort; the OBC is modified, so that the dimensional stability of the material is improved; the environment-friendly cross-linking agent is adopted, volatile organic compounds such as acetophenone and the like are not contained, and the environment-friendly characteristic is achieved; and the mould device used in the preparation method of the soft skin-friendly slippers is heated quickly, so that the copying precision of sole grains is effectively improved, the demoulding is quick, the injection molding yield and the production efficiency are effectively improved, and the preparation method is suitable for large-batch production and use.

Description

Preparation method of soft skin-friendly slippers
Technical Field
The invention relates to the technical field of shoemaking processes, in particular to a preparation method of soft skin-friendly slippers.
Background
With the improvement of the living standard, people are more and more pursuing comfortable substance enjoyment. The shoes are more and more regarded as the essential articles in the life of people. Shoes that are comfortable, lightweight, wear resistant, highly elastic, and have low permanent compressibility are increasingly sought after by people. The sole material comprises natural rubber at first, PVC synthetic leather and synthetic rubber, and EVA, PU, SBS, TPU and their corresponding foaming materials. However, these materials often do not meet the requirements of people for shoes. Careful analysis of these materials has revealed poor low temperature resistance, heavy taste, uncomfortable texture of natural rubber; the PVC synthetic leather is hardened at low temperature, has poor comfort, poor wear resistance and poor elasticity; synthetic rubbers such as vulcanized rubber, too heavy in taste and dense; the EVA material has poor wear resistance and large compression deformation; the PU synthetic leather has excellent wear resistance, light weight and high relative price; SBS wear resistance needs to be improved, compression deformation is large, and weather resistance is poor; TPU materials are expensive, have high hardness and are uncomfortable. Therefore, it is necessary to develop a sole material with excellent mechanical properties such as high elasticity, high wear resistance, high flexibility, low compression set, weather resistance, low temperature resistance, and light weight.
In addition, the common one-time injection molding in the existing shoemaking process is to put a mold on a heating machine for preheating, put the sole material into the mold for heating and molding after reaching a proper temperature, wherein in the shoemaking process, the mold is slow in heating and heat conduction, the heating speed of the mold is slow, and the shoemaking production efficiency is greatly reduced; and current shoemaking in-process carries out evacuation simultaneously to last lower mould simultaneously and handles to increase evacuation efficiency, but the simultaneous evacuation of last lower mould makes the interior evacuation flow direction of mould inhomogeneous, and the evacuation effect descends, and the pressurized is unstable moreover, and the sole line of gained is not clear enough, influences production quality.
In addition, in the one-step forming process, because the die cavity needs to keep high pressure in the shaping process, therefore, the upper die and the lower die are pressed tightly and tightly under the action of high pressure, so the demoulding is not easy to occur, therefore, a structure of a mould jumping device is usually arranged on the die, the mould jumping device is arranged on a shoe tree, when the upper die and the lower die are closed, the mould jumping device can be clamped into the lower die, after the vulcanization is completed, when the upper die and the lower die are separated and opened, the shoe tree is pulled by the lower die under the clamping action of the lower die on the mould jumping device, so that the shoe tree and the upper die are separated simultaneously, and the demoulding effect of the shoe tree is completed simultaneously.
Disclosure of Invention
Therefore, aiming at the problems, the invention provides a preparation method of soft skin-friendly slippers, which is characterized in that the low-melting-point polyamide of the shoes prepared from the indoor double-color leisure shoes is modified, so that the polarity of the materials is improved, the crystallization is reduced, the shrinkage can be effectively controlled, the compression deformation performance of the materials is improved, and the rubber has good hand feeling and high comfort; the OBC is modified, so that the dimensional stability of the material is improved; the environment-friendly cross-linking agent is adopted, volatile organic compounds such as acetophenone and the like are not contained, and the environment-friendly characteristic is achieved; and the mould device used in the preparation method of the soft skin-friendly slippers is heated quickly, so that the copying precision of sole grains is effectively improved, the demoulding is quick, the injection molding yield and the production efficiency are effectively improved, and the preparation method is suitable for large-batch production and use.
In order to realize the technical problem, the solution scheme adopted by the invention is as follows: a preparation method of soft skin-friendly slippers comprises the following steps:
step 1, preparing a polyamide mixture: premixing 45 parts of low-melting-point polyamide, 12 parts of hemp stem core ultrafine powder, 18 parts of EVA resin, 25 parts of OBC and 1.5 parts of zinc stearate in a high-speed mixer for 2-3 minutes, and then carrying out melt extrusion, cooling and granulation on the premix through a double-screw extruder at the temperature of 95-125 ℃ to obtain a polyamide mixture;
wherein the DSC melting point of the low-melting-point polyamide is within the range of 85 ℃ to 110 ℃;
step 2, preparing plastic rice: the plastic rice is prepared from the following raw materials in parts by weight:
Figure BDA0001889825680000031
firstly, mixing other raw materials except the foaming agent and the cross-linking agent, banburying, and turning for 5 times, wherein the turning temperatures are respectively 80 ℃, 85 ℃, 89 ℃, 93 ℃ and 97 ℃; then adding a foaming agent and a cross-linking agent, and continuing to turn over for 3 times, wherein the turning-over temperatures are 101 ℃, 105 ℃ and 108 ℃ respectively; pouring materials when the temperature reaches 110 ℃; then carrying out open milling, granulation, cooling and packaging to obtain plastic rice;
3, pouring plastic rice into a charging basket, adopting a one-time injection molding machine, automatically sucking materials, heating and pressurizing through a material pipe, wherein the temperature of the material pipe is 85 ℃, 88 ℃, 91 ℃, 94 ℃, and the injection pressure is 70 bar; setting the mold temperature at 175 ℃, and the vulcanization time at 230-; and (4) opening the mold after vulcanization, popping out the shoe tree, taking out the slipper, and performing oven shaping, last pressing shaping and freezing box shaping to obtain the soft skin-friendly slipper.
Further, the polyamide mixture in the step 1 is prepared from the following raw materials, by weight, 45 parts of low-melting-point polyamide, 12 parts of hemp stalk core ultrafine powder, 18 parts of EVA resin, 1.5 parts of OBC907725 parts of zinc stearate; among them, the DSC melting point of the low-melting polyamide is preferably in the range of 95 ℃ to 105 ℃.
Further, the plastic rice in the step 2 is prepared from the following raw materials in parts by weight:
Figure BDA0001889825680000041
further, the one-time injection molding machine comprises a mold frame, an upper mold, a lower mold, a heating device, a vacuumizing device and a control switchboard;
the upper mould comprises an upper mould seat, an upper mould core and a shoe tree, wherein the upper mould core and the shoe tree are fixed on the upper mould seat;
the lower die comprises a lower die base and a lower die core fixed on the lower die base, the lower die core is provided with a sole die cavity, and a lower injection port communicated with the sole die cavity is formed in the lower die core;
the die frame is provided with a positioning connecting rod, the upper die base and the lower die base penetrate through the positioning connecting rod, and the upper die base is positioned above the lower die base; the die frame is provided with a pressing cylinder, the execution end of the pressing cylinder is connected with the upper die base, and the pressing cylinder can push the upper die base to move up and down along the positioning connecting rod;
the heating device comprises a heating plate, an iron plate, a thermocouple and a heating control panel, the heating plate and the thermocouple are fixed on the side walls of the upper die core and the lower die core through the iron plate, the thermocouple is connected with the heating control panel, and the heating plate is controlled by the heating control panel;
the actuating end of the vacuumizing device is communicated with the sole die cavity of the lower die;
the pressing cylinder, the heating device and the evacuating device are all controlled by a control switchboard.
Furthermore, a telescopic cavity is arranged at the upper part of the upper die core above the upper die cavity; the shoe tree is provided with a telescopic rod capable of moving up and down and penetrating through the telescopic cavity, and a connecting plate is arranged on the telescopic rod in the telescopic cavity; the upper die base is provided with a telescopic cylinder, and an execution end of the telescopic cylinder penetrates into the telescopic cavity and is connected with the connecting plate; the telescopic cylinder is controlled by a control switchboard.
By adopting the technical scheme, the invention has the beneficial effects that: compared with the prior art, the preparation method of the soft skin-friendly slippers designed as above has the following advantages:
1. the low-melting-point polyamide is modified, so that the polarity of the material is improved, crystallization is reduced, shrinkage can be effectively controlled, the compression deformation performance of the material is improved, and the rubber has good hand feeling and high comfort; the OBC is modified, so that the dimensional stability of the material is improved; the environment-friendly cross-linking agent is adopted, volatile organic compounds such as acetophenone and the like are not contained, and the environment-friendly characteristic is achieved.
2. The positioning connecting rod on the die frame of the one-time injection molding machine can provide accurate positioning and calibration for the upper die and the lower die, so that the upper die and the lower die can be accurately closed; the heating plate is directly arranged on the side walls of the upper mold core and the lower mold core, namely, the shoe cavity is directly heated, the heating rate of the mold is increased, and the working efficiency of the mold is improved; the vacuumizing device is only communicated with the sole die cavity, when the die is closed, the vacuumizing device vacuumizes the shoe cavity formed by the upper die cavity, the shoe tree and the sole die cavity in a flow direction from top to bottom, the vacuumizing direction is unidirectional, the bonding pressure between the injected material and the shoe cavity is improved from top to bottom, and clear copying of sole patterns, particularly copying of multilayer three-dimensional patterns of the sole, is facilitated; the air cylinder is adopted for shoe tree demoulding, so that the shoe tree demoulding speed can be effectively improved, redundant external accessories (mould jumping devices) are not needed, the loss of the redundant external accessories is omitted, and the manufacturing cost of the external accessories is omitted; the control switchboard is used for integrated control, adopts the integrated control mode, promotes mould control degree of automation, promotes production efficiency. Therefore, the preparation method of the soft skin-friendly slippers reduces the vulcanization time, and the reproduction effect of deep groove patterns (the depth is more than 5mm) is excellent; a shutter is not needed, so that the material cost is reduced; is suitable for mass production and manufacture and has strong practicability.
Drawings
Fig. 1 is a schematic structural view of a one-shot injection molding machine according to embodiment 1 of the present invention.
Fig. 2 is a partial structural schematic view of an upper mold of a one-shot injection molding machine according to embodiment 1 of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific embodiments.
Example 1
A preparation method of soft skin-friendly slippers comprises the following steps:
step 1, preparing a polyamide mixture: according to parts by weight, 45 parts of low-melting-point polyamide (DSC melting point 98 ℃), 12 parts of hemp stalk core ultrafine powder, 18 parts of EVA7470M, 7725 parts of OBC907725 parts and 1.5 parts of zinc stearate are premixed in a high-speed mixer for 3 minutes, and then the premixed material is subjected to melt extrusion at 115 ℃ through a double-screw extruder and is cooled and granulated to obtain a polyamide mixture.
Step 2, preparing plastic rice: the plastic rice is prepared from the following raw materials in parts by weight:
Figure BDA0001889825680000061
Figure BDA0001889825680000071
firstly, mixing other raw materials except the foaming agent and the cross-linking agent, banburying, and turning for 5 times, wherein the turning temperatures are respectively 80 ℃, 85 ℃, 89 ℃, 93 ℃ and 97 ℃; then adding a foaming agent and a cross-linking agent, and continuing to turn over for 3 times, wherein the turning-over temperatures are 101 ℃, 105 ℃ and 108 ℃ respectively; pouring materials when the temperature reaches 110 ℃; and then the plastic rice is obtained after open milling, granulation, cooling and packaging.
And step 3: pouring plastic rice into a charging basket, adopting a one-time injection molding machine, automatically sucking materials, heating and pressurizing through a material pipe, wherein the temperature of the material pipe is 85 ℃, 88 ℃, 91 ℃, 94 ℃, and the injection pressure is 70 bar; the mold temperature is 175 ℃, and the vulcanization time is 235 seconds; and (4) opening the mold after vulcanization, popping out the shoe tree, taking out the slipper, and performing oven shaping, last pressing shaping and freezing box shaping to obtain the soft skin-friendly slipper.
Referring to fig. 1-2, the single-shot injection molding machine comprises a mold frame 1, an upper mold 2, a lower mold 3, a heating device 4, a vacuum pumping device 5 and a control switchboard 6;
the upper die 2 comprises an upper die base 21, an upper die core 22 fixed on the upper die base and a shoe tree 23, wherein an upper die cavity is formed in the upper die core 22, the shoe tree 23 is arranged in the upper die cavity in a lifting manner, and an upper injection port communicated with the upper die cavity is formed in the upper die core 22; the upper die core 22 is provided with a telescopic cavity 24 above the upper die cavity; the shoe tree 23 is provided with a telescopic rod 25 which can move up and down and is arranged in the telescopic cavity in a penetrating way, and a connecting plate 26 is arranged on the telescopic rod 25 in the telescopic cavity; a telescopic cylinder 27 is arranged on the upper die base 21, and an execution end of the telescopic cylinder 27 extends into the telescopic cavity and is connected with the connecting plate 26;
the lower die 3 comprises a lower die base 31 and a lower die core 32 fixed on the lower die base, the lower die core 32 is provided with a sole die cavity, and a lower injection port communicated with the sole die cavity is arranged on the lower die core 32;
a positioning connecting rod 11 is arranged on the die frame 1, the upper die base 21 and the lower die base 31 are arranged on the positioning connecting rod 11 in a penetrating manner, and the upper die base 21 is positioned above the lower die base 31; a pressing cylinder 12 is arranged on the die frame 1, the execution end of the pressing cylinder 12 is connected with the upper die base 21, and the pressing cylinder 12 can push the upper die base 21 to move up and down along the positioning connecting rod 11;
the heating device 4 comprises a heating plate, an iron plate, a thermocouple and a heating control plate, the heating plate and the thermocouple are fixed on the side walls of the upper die core and the lower die core through the iron plate, the thermocouple is connected with the heating control plate, and the heating plate is controlled by the heating control plate;
the execution end of the vacuumizing device 5 is communicated with the sole mold cavity of the lower mold;
the telescopic cylinder 27, the pressing cylinder 12, the heating device 4 and the evacuating device 5 are all controlled by the control switchboard 6.
The sole specific gravity of the soft skin-friendly slippers prepared by the method is 0.19g/cm3Hardness 35C, DIN wear resistance 162mm3Dimensional shrinkage of 1.0%, compression deformation of 48%, slip resistance coefficient (smooth) dry type of 0.65 and wet type of 0.47.
Example 2
The preparation method of the soft skin-friendly slippers in the embodiment 2 is the same as that in the embodiment 1, except that: in example 2
In step 1, the DSC melting point of the low melting point polyamide is 85 ℃ and the twin-screw extrusion temperature is 95 ℃.
In step 2, EVA7470M 17 parts and liquid 1, 2-polybutadiene 12 parts.
The sole specific gravity of the soft skin-friendly slippers prepared by the method is 0.19g/cm3Hardness 34C, DIN wear resistance 174mm3Dimensional shrinkage of 1.4%, compression deformation of 53%, slip resistance coefficient (smooth) of 0.70 wet type of 0.49.
Example 3:
the preparation method of the soft skin-friendly slippers in the embodiment 3 is the same as that in the embodiment 1, except that: in example 3
In step 1, the DSC melting point of the low melting point polyamide is 110 ℃ and the twin-screw extrusion temperature is 125 ℃.
In step 2, EVA7470M 6 parts, EVA 40W 14 parts, liquid 1, 2-polybutadiene 8 parts, foaming agent AC 2.8 parts, and crosslinking agent V-402.2 parts.
In step 3, the vulcanization time was 250 seconds.
The sole specific gravity of the soft skin-friendly slippers prepared by the method is 0.20g/cm3Hardness 37C, DIN wear resistance 183mm3Dimensional shrinkage of 1.7%, compression deformation of 50%, slip resistance coefficient (smooth) dry type of 0.59 and wet type of 0.40.
Comparative example 1
The preparation method of the soft skin-friendly slippers in comparative example 1 is the same as that in example 1, except that: comparative example 1
In step 1, 0 part of low-melting-point polyamide.
The sole specific gravity of the soft skin-friendly slippers prepared by the method is 0.21g/cm3Hardness 34C, DIN wear resistance 209mm32.8% dimensional shrinkage, 81% compressive deformation, 0.50 dry (smooth) slip resistance coefficient, 0.37 wet.
Comparative example 2
The preparation method of the soft skin-friendly slippers in comparative example 2 is the same as that in example 1, except that: the one-shot injection molding machine used in comparative example 2 was not equipped with the heating device, but used conventional mold base plate heating to raise the temperature of the mold by heat transfer effect; the vacuum extractor of the one-shot injection molding machine used in comparative example 2 was operated in a conventional mode in which the upper mold and the lower mold were simultaneously evacuated; the one-shot injection molding machine used in comparative example 2 did not have a telescopic cylinder for shoe last removal, but used a conventional skip mold.
In the experimental process of comparative example 2, the vulcanization temperature is 175 ℃, the vulcanization time is 235 seconds, the sole is not completely crosslinked, and after multiple experiments, the vulcanization time is 390 seconds, the sole is completely crosslinked, and the grains are clear.
Comparative example 2 the soft skin-friendly slippers obtained as described above had soles with specific gravity of 0.19g/cm3Hardness 37C, DIN wear resistance 189mm31.6% dimensional shrinkage, 53% compressive deformation, 0.64 wet (smooth) slip coefficient, 0.45.
After the data of the above examples 1-3 and comparative examples 1-2 were collated, the following Table 1 was obtained (note: hardness was measured using a GS-701N durometer, dimensional shrinkage was measured at 50 degrees for 4 hours, DIN abrasion was measured at 50 degrees for 4 hours, compression set was measured at 50 degrees, GB/T9867: 2001, compression set was measured at HG/T2876 (temperature 50 degrees C., time 6 hours, compression ratio 50%), slip factor was measured at TM 144: 2011.)
TABLE 1 comparison of experimental data
Figure BDA0001889825680000101
In conclusion, the preparation method of the soft skin-friendly slippers improves the comprehensive performance of the material, reduces the shrinkage, increases the wear resistance and has lower hardness; the heating is rapid in the preparation process, the sole lines are copied clearly, the production efficiency and the finished product quality are improved, the shoe sole is suitable for being produced and used in large batch, and the practicability is high.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.

Claims (4)

1. A preparation method of soft skin-friendly slippers is characterized by comprising the following steps:
step 1, preparing a polyamide mixture: premixing 45 parts of low-melting-point polyamide, 12 parts of hemp stalk core ultrafine powder, 18 parts of EVA resin, 25 parts of OBC and 1.5 parts of zinc stearate in a high-speed mixer for 2-3 minutes, and then carrying out melt extrusion, cooling and granulation on the premix through a double-screw extruder at the temperature of 95-125 ℃ to obtain a polyamide mixture;
wherein the DSC melting point of the low-melting-point polyamide is within the range of 85 ℃ to 110 ℃;
step 2, preparing plastic rice: the plastic rice is prepared from the following raw materials in parts by weight:
Figure FDA0003025838840000011
firstly, mixing other raw materials except the foaming agent and the cross-linking agent, banburying, and turning for 5 times, wherein the turning temperatures are respectively 80 ℃, 85 ℃, 89 ℃, 93 ℃ and 97 ℃; then adding a foaming agent and a cross-linking agent, and continuing to turn over for 3 times, wherein the turning-over temperatures are 101 ℃, 105 ℃ and 108 ℃ respectively; pouring materials when the temperature reaches 110 ℃; then carrying out open milling, granulation, cooling and packaging to obtain plastic rice;
3, pouring plastic rice into a charging basket, adopting a one-time injection molding machine, automatically sucking materials, heating and pressurizing through a material pipe, wherein the temperature of the material pipe is 85 ℃, 88 ℃, 91 ℃, 94 ℃, and the injection pressure is 70 bar; setting the mold temperature at 175 ℃, and the vulcanization time at 230-; opening the mold after vulcanization, popping out the shoe tree, taking out the slippers, and performing oven shaping, last pressing shaping and freezing box shaping to obtain the soft skin-friendly slippers;
the one-time injection molding machine comprises a mold frame, an upper mold, a lower mold, a heating device, a vacuumizing device and a control switchboard;
the upper mould comprises an upper mould seat, an upper mould core and a shoe tree, wherein the upper mould core and the shoe tree are fixed on the upper mould seat;
the lower die comprises a lower die base and a lower die core fixed on the lower die base, the lower die core is provided with a sole die cavity, and a lower injection port communicated with the sole die cavity is formed in the lower die core;
the die frame is provided with a positioning connecting rod, the upper die base and the lower die base penetrate through the positioning connecting rod, and the upper die base is positioned above the lower die base; the die frame is provided with a pressing cylinder, the execution end of the pressing cylinder is connected with the upper die base, and the pressing cylinder can push the upper die base to move up and down along the positioning connecting rod;
the heating device comprises a heating plate, an iron plate, a thermocouple and a heating control panel, the heating plate and the thermocouple are fixed on the side walls of the upper die core and the lower die core through the iron plate, the thermocouple is connected with the heating control panel, and the heating plate is controlled by the heating control panel;
the actuating end of the vacuumizing device is communicated with the sole die cavity of the lower die;
the pressing cylinder, the heating device and the evacuating device are all controlled by a control switchboard.
2. The preparation method of the soft skin-friendly slippers according to claim 1, wherein the polyamide mixture in step 1 is prepared from the following raw materials in parts by weight: 45 parts of low-melting-point polyamide, 12 parts of hemp stem core ultrafine powder, 18 parts of EVA resin, 907725 parts of OBC and 1.5 parts of zinc stearate; among them, the DSC melting point of the low-melting polyamide is preferably in the range of 95 ℃ to 105 ℃.
3. The preparation method of the soft skin-friendly slippers according to claim 1, wherein the plastic rice in the step 2 is prepared from the following raw materials in parts by weight:
Figure FDA0003025838840000031
4. the method for preparing a pair of soft skin-friendly slippers according to claim 1, wherein the method comprises the following steps: the upper die core is provided with a telescopic cavity above the upper die cavity; the shoe tree is provided with a telescopic rod capable of moving up and down and penetrating through the telescopic cavity, and a connecting plate is arranged on the telescopic rod in the telescopic cavity; the upper die base is provided with a telescopic cylinder, and an execution end of the telescopic cylinder penetrates into the telescopic cavity and is connected with the connecting plate; the telescopic cylinder is controlled by a control switchboard.
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CN101918189A (en) * 2007-12-27 2010-12-15 康特克化学有限公司 Injection molding apparatus for shoe or sole using thermoplastic resine and thereby shoes
CN104277316A (en) * 2014-08-07 2015-01-14 茂泰(福建)鞋材有限公司 Antiskid EVA sole and preparation method thereof
CN106832470A (en) * 2017-01-06 2017-06-13 茂泰(福建)鞋材有限公司 A kind of anti-slip rubber sole and preparation method thereof
CN108623892A (en) * 2018-04-09 2018-10-09 广东国立科技股份有限公司 A kind of EVA foam shoe material and preparation method thereof that heat resistanceheat resistant is shunk

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Publication number Priority date Publication date Assignee Title
CN101918189A (en) * 2007-12-27 2010-12-15 康特克化学有限公司 Injection molding apparatus for shoe or sole using thermoplastic resine and thereby shoes
CN104277316A (en) * 2014-08-07 2015-01-14 茂泰(福建)鞋材有限公司 Antiskid EVA sole and preparation method thereof
CN106832470A (en) * 2017-01-06 2017-06-13 茂泰(福建)鞋材有限公司 A kind of anti-slip rubber sole and preparation method thereof
CN108623892A (en) * 2018-04-09 2018-10-09 广东国立科技股份有限公司 A kind of EVA foam shoe material and preparation method thereof that heat resistanceheat resistant is shunk

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