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WO2021068100A1 - 中空弹性体制程 - Google Patents

中空弹性体制程 Download PDF

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Publication number
WO2021068100A1
WO2021068100A1 PCT/CN2019/109897 CN2019109897W WO2021068100A1 WO 2021068100 A1 WO2021068100 A1 WO 2021068100A1 CN 2019109897 W CN2019109897 W CN 2019109897W WO 2021068100 A1 WO2021068100 A1 WO 2021068100A1
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WO
WIPO (PCT)
Prior art keywords
hollow
elastomer
screw extruder
hollow elastomer
water chamber
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PCT/CN2019/109897
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English (en)
French (fr)
Inventor
郭志雄
Original Assignee
加久企业股份有限公司
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Priority to PCT/CN2019/109897 priority Critical patent/WO2021068100A1/zh
Publication of WO2021068100A1 publication Critical patent/WO2021068100A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • 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
    • C08J9/02—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by the reacting monomers or modifying agents during the preparation or modification of macromolecules

Definitions

  • the present invention relates to the production of thermoplastic elastomers, and particularly refers to the process of hollow elastomers in a hollow form.
  • Shoes are basically composed of upper, sole, and insole. Among them, the sole needs to support the gravity of the whole body, absorb the reaction force from the ground when walking, and the intense reaction force from the ground during activities, so the sole needs to be able to provide Stable walking and slow down the reaction force from the ground, so the sole needs to have good cushioning and support characteristics.
  • common shoe soles are made of a single material using foaming technology to make foamed soles, or foamed soles are equipped with air cushions (airbags), or the entire soles are made of air cushions (airbags), or use thermoplastic elastomers (Thermoplastic Elastomer, TPE) through Physically foam to make a monolithic sole.
  • foamed soles are equipped with air cushions (airbags), or the entire soles are made of air cushions (airbags), or use thermoplastic elastomers (Thermoplastic Elastomer, TPE) through Physically foam to make a monolithic sole.
  • TPE thermoplastic Elastomer
  • thermoplastic elastomers are lighter in weight. Therefore, the thermoplastic elastomers have been relatively lightweight in recent years.
  • a large number of thermoplastic elastomers have been developed and used, and they have been applied to shoes for various purposes, greatly reducing the weight of wearing shoes and having good supporting properties.
  • the invention provides a hollow elastic body process, and the finished product has the characteristics of good cushioning and rebound and light material, and can be further applied to shoe soles.
  • a hollow elastic system process which comprises: a mixing step, placing a thermoplastic elastomer in a twin-screw mixer, heating, kneading, and forming a soft agglomerated rubber; an input step, placing the agglomerated rubber
  • the single-screw extruder is heated, and the gas is input into the single-screw extruder to pressurize, so that the gas is dissolved in the agglomerated rubber material to form a mixed rubber material, wherein the gas is nitrogen or carbon dioxide;
  • the forming step mixing The rubber material is extruded from the hollow die of the single-screw extruder, and is immersed in the water chamber outside the hollow die, so that the liquefied gas dissolved in the mixed rubber is caused by the difference between the water chamber and the single-screw extruder.
  • the hollow elastomer Under the action of the pressure difference, the hollow elastomer is swelled and cut by the cutter located in the water chamber to obtain the hollow elastomer; and in the drying step, the hollow elastomer is taken out from the water chamber and dried.
  • thermoplastic elastomer is a mixture of any one or more of polyurethane-based thermoplastic elastomer TPU, polyester ether-based thermoplastic elastomer TPEE, or polyamide-based thermoplastic elastomer TPAE.
  • the cooling water input into the water chamber is 5°C-25°C.
  • the pressure of the water chamber is controlled at 1 to 3 bar (BAR).
  • the heating temperature of the single-screw extruder is higher than 150°C.
  • the hollow elastomer is in the form of hollow spheres or hollow particles, and the hardness of the hollow elastomer is 15-50 Asker C; the density of the hollow elastomer is ⁇ 110kg/cm 3 ; the tensile strength of the hollow elastomer ⁇ 12kg/cm 2 ; the elongation rate of the hollow elastomer ⁇ 150%; the tear strength of the hollow elastomer ⁇ 7kg/cm; the resilience rate of the hollow elastomer ⁇ 55%.
  • Figure 1 is a flowchart of the hollow elastic system process of the present invention
  • Figure 2 is a schematic diagram of mixing in a twin-screw mixer according to the present invention.
  • Figure 3 is a schematic diagram of forming in a single screw extruder according to the present invention.
  • Figure 4 is a schematic partial cross-sectional view of the hollow die of the present invention.
  • thermoplastic elastomer 1 is placed in a twin-screw mixer 2 and heated and kneaded to form a soft agglomerated rubber material 3, as shown in Figure 2;
  • the agglomerated rubber material 3 is heated in the single-screw extruder 4, and gas (nitrogen or carbon dioxide) is input into the single-screw extruder 4 to pressurize, so that the gas is dissolved in the agglomerated rubber material 3, thereby
  • the mixed rubber material 30 is formed, as shown in FIG. 3, and the gas is sent to the inside of the single-screw extruder 4 through the gas pipeline 41;
  • the mixed rubber material 30 is extruded from the hollow die 42 of the single-screw extruder 4 and immersed in the water chamber 5 outside the hollow die 42 so that the liquefied gas dissolved in the mixed rubber material 30 is caused to Under the action of the pressure difference between the water chamber 5 and the single-screw extruder 4, the hollow elastomer 6 is cut by the cutting knife 51 located in the water chamber 5 at the same time, as shown in FIG. 4; and the drying step, from The hollow elastomer 6 is taken out from the water chamber 5 and dried.
  • the present invention can produce the hollow elastic body 6, which can obtain good cushioning and rebound after being removed by bearing external force, and also takes into account the characteristics of light material, so the hollow elasticity When body 6 is applied to shoe sole-related products, good physical properties can be obtained.
  • the motor 52 drives the cutter 51 to rotate rapidly to quickly cut the mixed rubber 30 extruded from the hollow die 42. Because the material is still in a high temperature and soft and plastic state at each cut, The cutting action of the rotation can cause the material to be deformed and bonded after being forced to form a closed hollow elastic body 6 finally.
  • the gas originally input to the single-screw extruder 4 is liquefied under the high internal pressure of the single-screw extruder 4, and is evenly dissolved in the mixed compound 30, and is then extruded through the control water chamber 5 and the single-screw
  • the internal pressure difference between the two exits 4 changes (the pressure in the water chamber 5 is much smaller than the internal pressure of the single screw extruder 4), so that the hollow elastomer 6 located in the water chamber 5 is inside the shell, even inside and outside
  • the surface is covered with tiny holes, which can become a hollow elastic body 6 with a lightweight effect, which can more effectively cushion external forces and support rebound.
  • the thermoplastic elastomer is polyester ether as an example.
  • the hollow elastomer 6 prepared through the mixing step, the input step, the forming step and the drying step has the following physical properties: the density of the hollow elastomer 6 is ⁇ 110kg/cm 3 .
  • the tensile strength of the hollow elastomer 6 is ⁇ 12kg/cm 2 measured according to the ASTM-D624 standard.
  • the elongation of the hollow elastomer is ⁇ 150% measured according to the ASTM-D624 standard.
  • the tear strength of the hollow elastomer 6 is ⁇ 7kg/cm measured according to the ASTM-D638 standard.
  • the resilience rate of hollow elastomer 6 is ⁇ 55% as measured according to ASTM-D2632 standard.
  • thermoplastic elastomer 1 it may be a mixture of any one or more of polyurethane-based thermoplastic elastomer TPU, polyester ether-based thermoplastic elastomer TPEE, or polyamide-based thermoplastic elastomer TPAE.
  • the pressure of the water chamber 5 is controlled between 1 and 3 bar (BAR).
  • the temperature of the cooling water input into the water chamber 5 is 5° C. to 25° C., so as to reduce the temperature of the hollow elastomer 6 to further stabilize the appearance of the hollow elastomer 6.
  • the finished hollow elastomer 6 is in the form of hollow spheres or hollow particles, and the hardness of the hollow elastomer 6 is 15-50 Asker C.
  • the pressure in the single screw extruder 4 exceeds 200 bar (BAR).
  • the heating temperature of the single screw extruder 4 is higher than 150°C.
  • the hollow elastic system process of the present invention can obtain a hollow thermoplastic elastomer, which has the characteristics of good cushioning and rebound and light material. It is especially suitable for soles for various purposes. It can greatly reduce the heavy feeling of wearing shoes and has a good Supporting characteristics. Therefore, it has industrial applicability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Molding Of Porous Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

一种中空弹性体（6）制程，包括有混合步骤、输入步骤、成形步骤以及干燥步骤，借以制得中空弹性体（6）。该中空弹性体（6）在承受外力而移除后具有良好缓冲回弹的性能，更兼具材质轻的特点，由此将其应用在鞋底相关产品时，可以获得良好物理特性表现。

Description

中空弹性体制程 技术领域
本发明是关于热塑性弹性体的制作，特别是指中空型态的中空弹性体制程。
背景技术
鞋基本上由鞋面、鞋底以及鞋垫等多个部位组成，其中又以鞋底需要支撑整个身体重力、吸收走路时来自地面的反作用力，以及活动时来自地面的激烈反作用力，因此鞋底需要能够提供稳定行走，减缓来自地面的反作用力，所以鞋底需要拥有良好的缓冲与支撑特性。
目前常见鞋底有单一材质利用发泡技术制作发泡鞋底，或发泡鞋底内配置有气垫(气囊)，或是整个鞋底就是采用气垫(气囊)，或利用热塑性弹性体(Thermoplastic Elastomer，TPE)经由物理发泡制作整体式鞋底。
前述热塑性弹性体相较于以往EVA(Ethylene Vinyl Acetate，乙烯醋酸乙烯酯共聚物)、PU(Polyurethane，聚胺酯)一体发泡的鞋底，以及橡胶鞋底来的轻量，因此热塑性弹性体在近年来相当受到业者与消费者的青睐，大量开发并使用热塑性弹性体，更应用于各种用途的鞋款上，大幅度减轻穿着鞋的沉重感以及具有良好的支撑特性。
发明内容
本发明提供一种中空弹性体制程，且其成品具有良好缓冲回弹以及材质轻特点，更能进一步应用于鞋底。
一种中空弹性体制程，其包括：混合步骤，将热塑性弹性体置于双螺杆型混炼机经加热、揉合作用呈具软性的成团胶料；输入步骤，将成团胶料置入单螺杆挤出机内加热，且输入气体至单螺杆挤出机内加压，使得气体溶入于成团胶料，借以形成混合胶料，其中所述气体为氮气或二氧化碳；成形步骤，混合胶料由单螺杆挤出机的中空模头挤出，并浸置位于中空模头外的水室内，而使得溶于混合胶料的液化的气体因水室与单螺杆挤出机两者的压力差作用下膨胀，同时由位于水室内的切刀裁切制得中空弹性体；以及干燥步骤，从水室取出中空弹性体并加以干燥。
所述中空弹性体制程，其中热塑性弹性体为聚氨酯类热塑性弹性体TPU、聚酯醚类热塑性弹性体TPEE或聚酰胺类热塑性弹性体TPAE中任一种或多种的混合。
所述中空弹性体制程，其中输入水室内的冷却水为5℃～25℃。
所述中空弹性体制程，其中水室的压力控制于1～3巴(BAR)。
所述中空弹性体制程，其中单螺杆挤出机内的压力超过200巴(BAR)。
所述中空弹性体制程，其中单螺杆挤出机的加热温度高于150℃。
所述中空弹性体制程，其中中空弹性体呈中空球型或中空粒型，且中空弹性体的硬度为15～50Asker C；中空弹性体的密度≧110kg/cm 3；中空弹性体的拉伸强度≧12kg/cm 2；中空弹性体的伸长率≧150％；中空弹性体的撕裂强度≧7kg/cm；中空弹性体的回弹率≧55％。
附图说明
图1为本发明中空弹性体制程的流程图；
图2为本发明在双螺杆型混炼机进行混合示意图；
图3为本发明在单螺杆挤出机进行成形示意图；
图4为本发明的中空模头局部剖面示意图。
附图中的符号说明：
1  热塑性弹性体；
2  双螺杆型混炼机；
3  成团胶料；
30 混合胶料；
4  单螺杆挤出机；
41 气体管路；
42 中空模头；
5  水室；
51 切刀；
52 马达；
6  中空弹性体。
具体实施方式
请配合参阅图1所示，本发明中空弹性体制程的流程图，包括有混合步骤、输入步骤、成形步骤以及干燥步骤，其中：
混合步骤，将热塑性弹性体1置于双螺杆型混炼机2经加热、揉合作用呈具软性的成团胶料3，如图2所示；
输入步骤，将成团胶料3置入单螺杆挤出机4内加热，且输入气体(氮或二氧化碳)至单螺杆挤出机4内加压，使得气体溶入于成团胶料3，借以形成混合胶料30，如图3所示，经由气体管路41输送气体至单螺杆挤出机4内部；
成形步骤，混合胶料30由单螺杆挤出机4的中空模头42挤出，并浸置位于中空模头42外的水室5内，而使得溶于混合胶料30的液化的气体因水室5与单螺杆挤出机4两者的压力差作用下膨胀，同时由位于水室5内的切刀51裁切制得中空弹性体6，如图4所示；以及 干燥步骤，从水室5取出中空弹性体6并加以干燥。
本发明借由混合步骤、输入步骤、成形步骤以及干燥步骤，能够制作出中空弹性体6，其可以在承受外力而移除后获得良好缓冲回弹，更兼顾材质轻的特点，因此将中空弹性体6应用在鞋底相关产品时，可以获得良好物理特性表现。
值得注意的，借由马达52带动切刀51快速转动下，迅速切断从中空模头42挤出的混合胶料30，每次的截断处因材料仍处于高温与软质可塑形的状态下，可以由旋转的裁切动作造成材料截断处受力变形后加以黏合，最后得以形成封闭的中空弹性体6。此外，原本输入单螺杆挤出机4的气体因单螺杆挤出机4的内部高压力下而液化，并均匀的溶入于混合胶料30之中，又通过控制水室5与单螺杆挤出机4两者之间内部压力差变化下(水室5内的压力远小于单螺杆挤出机4的内部压力)，以致位于水室5的中空弹性体6其壳体的内部，甚至内外表面皆布满细微孔穴，如此可以成为具有轻量效果的中空弹性体6，更能有效缓冲外力以及支撑回弹。
本发明中空弹性体制程中热塑性弹性体以聚酯醚类为例，通过混合步骤、输入步骤、成形步骤以及干燥步骤所制得中空弹性体6其相关物理特性如下，中空弹性体6的密度≧110kg/cm 3。中空弹性体6的拉伸强度依据ASTM-D624标准测量为≧12kg/cm 2。中空弹性体的伸长率依据ASTM-D624标准测量为≧150％。中空弹性体6的撕裂强度依据ASTM-D638标准测量为≧7kg/cm。中空弹性体6回弹率依据ASTM-D2632标准测量为≧55％。
关于所述热塑性弹性体1可为聚氨酯类热塑性弹性体TPU、聚酯醚类热塑性弹性体TPEE或聚酰胺类热塑性弹性体TPAE中任一种或多种的混合。
水室5的压力控制介于1～3巴(BAR)。此外，输入水室5内的冷却水温度为5℃～25℃，借以降低中空弹性体6的温度更加以稳定中空弹性体6的外型。关于中空弹性体制程所制作完成的中空弹性体6呈中空球型或中空粒型，且中空弹性体6的硬度为15～50Asker C。
所述单螺杆挤出机4内的压力超过200巴(BAR)。所述单螺杆挤出机4的加热温度高于150℃。
工业实用性
本发明的中空弹性体制程能够得到中空形态的热塑性弹性体，其具有良好缓冲回弹以及材质轻的特点，特别适用于各种用途的鞋底，能够大幅度减轻穿着鞋的沉重感以及具有良好的支撑特性。因此，具有工业实用性。

Claims (8)

  1. 一种中空弹性体制程，其中，包括：
    混合步骤，将热塑性弹性体置于双螺杆型混炼机经加热、揉合作用呈具软性的成团胶料；
    输入步骤，将所述成团胶料置入单螺杆挤出机内加热，且输入气体至单螺杆挤出机内加压，使得所述气体溶入所述成团胶料，借以形成混合胶料，其中，所述气体为氮气或二氧化碳；
    成形步骤，所述混合胶料由所述单螺杆挤出机的中空模头挤出，并浸置位于所述中空模头外的水室内，而使得溶于所述混合胶料的液化的所述气体因所述水室与所述单螺杆挤出机两者的压力差作用下膨胀，同时由位于所述水室内的切刀裁切制得中空弹性体；以及
    干燥步骤，从所述水室取出所述中空弹性体并加以干燥。
  2. 如权利要求1所述的中空弹性体制程，其中，所述热塑性弹性体为聚氨酯类热塑性弹性体TPU、聚酯醚类热塑性弹性体TPEE或聚酰胺类热塑性弹性体TPAE中任一种或多种的混合。
  3. 如权利要求1所述的中空弹性体制程，其中，输入所述水室的冷却水温度为5℃至25℃。
  4. 如权利要求1所述的中空弹性体制程，其中，所述水室内的压力控制介于1至3巴。
  5. 如权利要求1所述的中空弹性体制程，其中，所述单螺杆挤出机内的压力超过200巴。
  6. 如权利要求1所述的中空弹性体制程，其中，所述单螺杆挤出机的加热温度高于150℃。
  7. 如权利要求1所述的中空弹性体制程，其中，所述中空弹性体呈中空球型或中空粒型，且所述中空弹性体的硬度为15至50Asker C。
  8. 如权利要求1至7中任一项所述的中空弹性体制程，其中，所述中空弹性体的密度≧110kg/cm 3；所述中空弹性体的拉伸强度≧12kg/cm 2；所述中空弹性体的伸长率≧150％；所述中空弹性体的撕裂强度≧7kg/cm；所述中空弹性体的回弹率≧55％。
PCT/CN2019/109897 2019-10-08 2019-10-08 中空弹性体制程 WO2021068100A1 (zh)

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