CN109648902B

CN109648902B - Preparation method of indoor double-color leisure shoes

Info

Publication number: CN109648902B
Application number: CN201811466042.9A
Authority: CN
Inventors: 卢鑫; 罗显发; 丁思博; 郑荣大
Original assignee: Quanzhou Jinke Technology Detection Co ltd
Current assignee: Quanzhou Jinke Technology Co.,Ltd.
Priority date: 2018-12-03
Filing date: 2018-12-03
Publication date: 2021-05-18
Anticipated expiration: 2038-12-03
Also published as: CN109648902A

Abstract

The invention relates to the technical field of shoe making processes, and provides a preparation method of indoor double-color leisure shoes, wherein SEBS modification is performed on shoes made of the indoor double-color leisure shoes, so that the crystallization rate of the materials is reduced, 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 17-40B 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 indoor double-color leisure shoes is heated rapidly, so that the sole grain copying precision is effectively improved, the demoulding is rapid, the injection molding yield and the production efficiency are effectively improved, and the method is suitable for large-batch production and use.

Description

Preparation method of indoor double-color leisure shoes

Technical Field

The invention relates to the technical field of shoe making processes, in particular to a preparation method of indoor double-color leisure shoes.

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 indoor double-color leisure shoes, which is characterized in that SEBS modification is carried out on shoes prepared from the indoor double-color leisure shoes, so that the crystallization rate of the materials is reduced, 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 17-40B 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 indoor double-color leisure shoes is heated rapidly, so that the sole grain copying precision is effectively improved, the demoulding is rapid, the injection molding yield and the production efficiency are effectively improved, and the 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 indoor double-color leisure shoes comprises the following steps:

step 1, preparing an elastomer material: 50 parts of SEBS, 15-20 parts of white mineral oil, 20 parts of EVA resin, 20-25 parts of OBC and 1.5 parts of zinc stearate are premixed in a high-speed mixer for 4-6 minutes, and then the premix is subjected to melt extrusion, cooling and granulation at the temperature of 170-230 ℃ through a double-screw extruder to obtain an elastomer material;

step 2, preparing plastic rice: the plastic rice is prepared from the following raw materials in parts by weight:

firstly, mixing other raw materials except the foaming agent AC and the cross-linking agent 17-40B for banburying, and turning for 5 times, wherein the turning temperatures are 85-87 ℃, 90-91 ℃, 94-95 ℃, 98-99 ℃ and 102-103 ℃ respectively; then adding a foaming agent AC and a cross-linking agent 17-40B, and continuing to turn over for 3 times, wherein the turning-over temperatures are 106-107 ℃, 110-111 ℃ and 114-115 ℃ respectively; when the temperature reaches 118 ℃, pouring materials; then carrying out open milling, granulation, cooling and packaging to obtain plastic rice;

step 3, pouring two plastic rice with different colors into two different charging barrels, adopting a one-time injection molding machine with two groups of injection guns, automatically sucking materials, heating and pressurizing through a material pipe, wherein the temperature of the material pipe is 88 ℃, 91 ℃, 94 ℃ and 97 ℃, and the injection pressure is 70 bar;

and 4, step 4: setting an operation flow for a primary injection molding machine, opening an upper die and a lower die, placing a middle bottom plate, closing the upper die and the lower die, vacuumizing the interior of the die, stopping vacuumizing when the vacuum degree reaches-0.07 bar to-0.1 bar, respectively injecting materials into the upper die and the lower die by two groups of injection guns, and controlling the temperatures of the upper die, the lower die and the middle bottom plate to be 40-97 ℃; then separating the upper mold lower mold, removing the middle bottom plate, closing the upper mold lower mold, heating the mold to 178-fold 180 ℃ within 1 minute, and vulcanizing for 200-fold 240 seconds; and after vulcanization, opening the mold, taking out the shoe, and performing oven shaping, last pressing shaping and freezer shaping to obtain the indoor double-color leisure shoe.

Furthermore, the elastomer material in the step 1 is prepared from the following raw materials, by weight, 50 parts of SEBS, 15 parts of white mineral oil, 20 parts of EVA, 20 parts of OBC and 1.5 parts of zinc stearate.

Further, the plastic rice in the step 2 is prepared from the following raw materials in parts by weight:

further, the one-time injection molding machine comprises a mold frame, an upper mold, a lower mold, a middle bottom plate, 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 middle bottom plate is detachably arranged between the upper die and the lower die; when the middle bottom plate is loaded, the upper die and the lower die are closed, the middle bottom plate can isolate the upper die cavity and the sole die cavity, when the middle bottom plate is disassembled, the upper die and the lower die are closed, and the upper die cavity is communicated with the sole die cavity;

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 vacuumizing 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 indoor double-color leisure shoes designed as above has the following advantages:

1. SEBS modification reduces the crystallization rate of the material, improves the compression deformation performance of the material, and has good rubber 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 17-40B 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 indoor double-color leisure shoes reduces the vulcanizing 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 indoor double-color leisure shoes comprises the following steps:

step 1, preparing an elastomer material A: the elastomer material A is prepared by premixing 50 parts by weight of SEBS YH 50350 parts, 400615 parts by weight of white mineral oil, 747020 parts by weight of EVA, 910720 parts by weight of OBC and 1.5 parts by weight of zinc stearate in a high-speed mixer for 5 minutes, and then melting, extruding, cooling and granulating the premix through a double-screw extruder at 180 ℃ to obtain an elastomer material A;

preparing an elastomer material B: the elastomer material B is prepared by premixing SEBS YH 68850 parts, white mineral oil 400625 parts, EVA 747010 parts, EVA 40W 10 parts, OBC 907725 parts and zinc stearate 1.5 parts in a high-speed mixer for 5 minutes, and then carrying out melt extrusion, cooling and granulation on the premix through a double-screw extruder at 180 ℃ to obtain the elastomer material B.

Step 2, preparing plastic rice A: the plastic rice A is prepared from the following raw materials in parts by weight:

firstly, mixing other raw materials except the foaming agent AC and the cross-linking agent 17-40B, banburying, and turning for 5 times, wherein the turning temperatures are respectively 87 ℃, 91 ℃, 95 ℃, 99 ℃ and 103 ℃; then adding a foaming agent AC and a cross-linking agent 17-40B, and continuing to turn over for 3 times, wherein the turning-over temperatures are 107 ℃, 111 ℃ and 115 ℃ respectively; when the temperature reaches 118 ℃, pouring materials; then carrying out open milling, granulation, cooling and packaging to obtain plastic rice A;

preparing plastic rice B: the plastic rice B is prepared from the following raw materials in parts by weight:

firstly, mixing other raw materials except the foaming agent AC and the cross-linking agent 17-40B, banburying, and turning for 5 times, wherein the turning temperatures are 85 ℃, 90 ℃, 94 ℃, 98 ℃ and 102 ℃ respectively; then adding a foaming agent AC and a cross-linking agent 17-40B, and continuing to turn over for 3 times, wherein the turning-over temperatures are 106 ℃, 110 ℃ and 114 ℃ respectively; when the temperature reaches 118 ℃, pouring materials; and then the plastic rice B is obtained after open milling, granulation, cooling and packaging.

And step 3: the plastic rice A and B with different colors are respectively poured into two different charging barrels, a one-time injection molding machine with two groups of injection guns is adopted, and the plastic rice A and the plastic rice B are automatically sucked and heated and pressurized through a material pipe, wherein the temperature of the material pipe is respectively 88 ℃, 91 ℃, 94 ℃, 97 ℃, and the injection pressure is 70 bar.

And 4, step 4: setting an operation flow for the primary injection molding machine, opening an upper mold and a lower mold, placing a middle bottom plate, vacuumizing the interior of the mold, stopping vacuumizing when the vacuum degree reaches-0.08 bar, injecting plastic rice A into the lower mold through a material pipe, injecting plastic rice B into the upper mold through the material pipe, and controlling the temperature of the upper mold, the lower mold and the middle bottom plate to be 82 ℃; then opening the lower die of the upper die, removing the middle bottom plate, closing the lower die of the upper die, heating the die to 180 ℃ for 1 minute, and vulcanizing for 210 seconds; and (4) opening the mold after vulcanization, taking out the shoe, and performing oven setting, last pressing setting and freezer setting to obtain the double-color indoor casual shoe.

Referring to fig. 1-2, the single-shot injection molding machine comprises a mold frame 1, an upper mold, a lower mold, a heating device 4, a vacuum pumping device 5, a control switchboard 6 and a middle bottom plate 7;

the upper die comprises an upper die base 21, an upper die core 22 and a shoe tree 23, wherein the upper die core 22 is fixed on the upper die base, 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 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;

the middle bottom plate 7 is detachably arranged between the upper die and the lower die; when the middle bottom plate 7 is loaded and the upper die and the lower die are closed, the middle bottom plate 7 can isolate the upper die cavity and the sole die cavity, and when the middle bottom plate 7 is disassembled and the upper die and the lower die are closed, the upper die cavity and the sole die cavity are communicated;

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 vacuumizing device 5 are all controlled by the control switchboard 6.

The prepared double-color indoor leisure shoe has sole hardness of 41C and specific gravity of 0.24g/cm³0.9% dimensional shrinkage and 142mm DIN abrasion resistance³38% compressive deformation, 0.68 wet type (smooth) slip coefficient (dry type) 0.49; vamp hardness of 27C and specific gravity of 0.22g/cm³0.7% dimensional shrinkage.

Example 2

The preparation method of the bicolor indoor leisure shoe of example 2 is the same as that of example 1, except that: in example 2

The elastic material A in the step 1: SEBS is YH501, EVA resin is 5110J 10 parts and 7470M 10 parts, OBC is 9500; b (vamp): SEBS is YH511 and 400615 parts of white mineral oil.

In the step 2, the plastic rice A comprises 3.1 parts of foaming agent AC, 2.8 parts of cross-linking agent 17-40B and 10 parts of nano calcium carbonate, and the plastic rice B comprises 3.0 parts of foaming agent AC, 2.7 parts of cross-linking agent 17-40B and 10 parts of nano calcium carbonate.

The prepared double-color indoor leisure shoe has the sole hardness of 38C and the specific gravity of 0.21g/cm³1.3% dimensional shrinkage and DIN abrasion resistance of 149mm³45% compressive deformation, 0.64 wet type (smooth) slip coefficient (0.46); vamp hardness of 24C and specific gravity of 0.21g/cm³And dimensional shrinkage 1.1%.

Comparative example 1

The preparation method of the two-color indoor leisure shoe in comparative example 1 is the same as that in example 1 except that: comparative example 1

The elastic material A and the elastic material B in the step 1 are both as follows: SEBS is 0 part, and white mineral oil is 0 part.

The prepared double-color indoor leisure shoe has the sole hardness of 49C and the specific gravity of 0.24g/cm³2.7% dimensional shrinkage, DIN abrasion resistance 205mm³73% compressive deformation, 0.48 dry (smooth) slip coefficient, 0.31 wet; the hardness of the vamp is 26C, and the specific gravity is 0.23g/cm³And 3.1% dimensional shrinkage.

Comparative example 2

The preparation method of the two-color indoor leisure shoe 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.

Comparative example 2 it was found that the vacuum only reached-0.04 bar during the experiment; when the vulcanization temperature is 180 ℃ and the vulcanization time is 210 seconds, the sole patterns are burnt, the sole is not completely crosslinked, after a plurality of tests, the vulcanization time is set to 410 seconds, the sole is completely crosslinked, but the part of the deep groove (the depth is more than 5mm) is burnt.

The prepared double-color indoor leisure shoes have sole hardness of 45C and specific gravity of 0.24g/cm³1.1% dimensional shrinkage and 167mm DIN abrasion resistance³Compression deformation of 46%, slip resistance coefficient (smooth) dry type of 0.60 and wet type of 0.39; vamp hardness of 31C and specific gravity of 0.22g/cm³And dimensional shrinkage 1.1%.

After the data of the above examples 1-2 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

In conclusion, the preparation method of the indoor double-color leisure shoes improves the comprehensive performance of the materials, 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

1. A preparation method of indoor double-color leisure shoes is characterized by comprising the following steps:

elastomer material 70 parts

EVA resin 20-25 parts

2.9-3.1 parts of foaming agent AC

Crosslinking agent 17-40B 2.5-2.8 parts

0.5 part of zinc stearate

Stearic acid 1 part

1.5 parts of zinc oxide

8-12 parts of nano calcium carbonate

0 to 2.5 portions of wear-resistant agent

0.2-2 parts of pigment;

and 4, step 4: setting an operation flow for a primary injection molding machine, opening an upper die and a lower die, placing a middle bottom plate, closing the upper die and the lower die, vacuumizing the interior of the die, stopping vacuumizing when the vacuum degree reaches-0.07 bar to-0.1 bar, respectively injecting materials into the upper die and the lower die by two groups of injection guns, and controlling the temperatures of the upper die, the lower die and the middle bottom plate to be 40-97 ℃; then separating the upper mold lower mold, removing the middle bottom plate, closing the upper mold lower mold, heating the mold to 178-fold 180 ℃ within 1 minute, and vulcanizing for 200-fold 240 seconds; after vulcanization, opening the mold, taking out the shoes, and performing oven shaping, last shaping and freezer shaping to obtain the indoor double-color casual shoes;

the one-time injection molding machine comprises a mold frame, an upper mold, a lower mold, a middle bottom plate, a heating device, a vacuumizing device and a control switchboard;

the pressing cylinder, the heating device and the vacuumizing device are all controlled by a control switchboard;

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.

2. The method for preparing indoor double-color leisure shoes according to claim 1, wherein the elastomer material in the step 1 is prepared from the following raw materials, by weight, 50 parts of SEBS, 15 parts of white mineral oil, 20 parts of EVA, 20 parts of OBC and 1.5 parts of zinc stearate.

3. The preparation method of the indoor double-color leisure shoes according to claim 1, wherein the plastic rice in the step 2 is prepared from the following raw materials in parts by weight:

elastomer material 70 parts

EVA resin 20 parts

Foaming agent AC 3.0 parts

2.6 portions of cross-linking agent 17-40B

0.5 part of zinc stearate

Stearic acid 1 part

1.5 parts of zinc oxide

10 portions of nano calcium carbonate

0 to 2.5 portions of wear-resistant agent

0.3 part of pigment.