CN108297325A - 一种高密度耐高温四氟管的制备方法及其模具 - Google Patents

一种高密度耐高温四氟管的制备方法及其模具 Download PDF

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CN108297325A
CN108297325A CN201810256152.6A CN201810256152A CN108297325A CN 108297325 A CN108297325 A CN 108297325A CN 201810256152 A CN201810256152 A CN 201810256152A CN 108297325 A CN108297325 A CN 108297325A
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mandrel
mold
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丁宏网
丁文
丁文一
余洪涛
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Jiangsu Tian Long Long Corrosion Protection Equipment Co Ltd
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C2043/106—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using powder material
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
    • B29C2043/3644—Vacuum bags; Details thereof, e.g. fixing or clamping
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
    • B29C2043/3649—Inflatable bladders using gas or fluid and related details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
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    • B29L2023/22—Tubes or pipes, i.e. rigid

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Abstract

本发明公开了一种新高密度聚四氟乙烯管的制备方法和模具，包括以下制备步骤：混合石墨和聚四氟乙烯粉末，放入筛粉机，再放入高密度聚四氟乙烯管模具的橡胶袋内。采用皮囊法，撤去外模，将装满粉末的橡胶袋密封，放入高压釜，将水压增大至30‑35Mpa，橡胶袋收缩，粉末挤压在芯轴上；取出成型件，利用仪表车床将外圆修至标准尺寸；放入程控烧结炉，按照烧结升温公式烧结；烧结完毕，冷却定型，取出芯轴，对产品尺寸进行检验，获得成品。一种高密度耐高温四氟管模具，包括振动底座、外模、加粉口、抽气孔、芯轴、橡胶袋。本发明生产的聚四氟乙烯管强度高、稳定性好，能耐250℃以上高温。

Description

一种高密度耐高温四氟管的制备方法及其模具
技术领域
本发明属于管材制备领域，具体涉及一种高密度耐高温四氟管的制备方法及其模具。
背景技术
聚四氟乙烯管具有质量轻、耐腐蚀、水流阻力小、综合节能型好、安装方便、使用寿命长等优点。通常使用挤压机推压制成的高密度聚四氟乙烯管工作温度仅能在120℃左右，而在化工、机电、电力等工况条件下，往往需要能耐250℃以上高温的聚四氟乙烯管。
发明内容
针对现有技术所存在的上述不足，本发明要解决的问题是提供一种新高密度聚四氟乙烯管的制备方法和模具，使产品强度高、稳定性好，能耐250℃以上高温，本发明采用如下技术方案：
一种高密度耐高温四氟管的制备方法，包括以下制备步骤：
1)称取高密度聚四氟乙烯粉、加石墨放入四氟专用混合机，石墨质量是聚四氟乙烯质量的5-8％，混合均匀，在90-110℃下，恒温搅拌25min，冷却至常温；
2)将混合后的粉末放入筛粉机，先用20目筛网过筛后，再用80目筛网过筛；
3)采用皮囊法，启动真空泵，通过抽气口使模具外模内壁形成负压，橡胶袋扩张，将过筛后的粉末放入橡胶袋内，放入速率为20-50g/min，放入同时振动底座开启振动，振动频率为200次/min，振动幅度在3mm以内；
4)撤去外模，将装满粉末的橡胶袋密封，连同芯轴取出，放入高压釜内，将水压增大至30-35Mpa，橡胶袋收缩，粉末挤压在芯轴上；
5)取出成型件，利用仪表车床将外圆修至标准尺寸；
6)放入程控烧结炉，保护仪表设定为385℃，按照烧结升温公式烧结；
7)烧结完毕，冷却定型，取出芯轴，对产品尺寸进行检验，获得成品。
相应地，一种用于制备高密度耐高温四氟管的模具，包括振动底座、外模、加粉口、抽气口、芯轴、橡胶袋，振动底座上表面为圆形，中部有芯轴定位孔，芯轴底端插入定位孔；外模为圆筒状，上部有上盖，外模与芯轴同轴放置，外模可拆卸地安装在振动底座上，芯轴和外模之间固定有橡胶袋，外模上表面布置有加粉孔，外模侧面均有有多个抽气口，抽气口连接真空泵，外模封闭时真空泵工作可形成负压将橡胶袋吸附在外模表面。
进一步地，外模通过螺纹连接安装在振动底座上。
进一步地，振动底座采用电磁簸动。
进一步地，芯轴和外模采用304不锈钢。
本发明的有益效果是，生产的聚四氟乙烯管强度高、稳定性好，能耐250℃以上高温。
附图说明
图1为本发明加工原理图；
图2为本发明模具剖视图。
图中：1振动底板座，2橡胶袋，3芯轴，4加粉口，5抽气口，6外模，定位孔7。
具体实施方式
下面结合附图和具体实施例详细描述一下本发明的具体内容。
如图1、图2所示，1.一种高密度耐高温四氟管的制备方法，包括以下制备步骤：
1)称取高密度聚四氟乙烯粉、加石墨放入四氟专用混合机，石墨质量是聚四氟乙烯质量的5-8％，混合均匀，在90-110℃下，恒温搅拌25min，冷却至常温；
2)将混合后的粉末放入筛粉机，先用20目筛网过筛后，再用80目筛网过筛；
3)采用皮囊法，启动真空泵，通过抽气口5使模具外模6内壁形成负压，橡胶袋2扩张，将过筛后的粉末放入橡胶袋2内，放入速率为20-50g/min，放入同时振动底座1开启振动，振动频率为200次/min，振动幅度在3mm以内；
4)撤去外模6，将装满粉末的橡胶袋2密封，连同芯轴3取出，放入高压釜内，将水压增大至30-35Mpa，橡胶袋2收缩，粉末挤压在芯轴3上；
5)取出成型件，利用仪表车床将外圆修至标准尺寸；
6)放入程控烧结炉，保护仪表设定为385℃，按照烧结升温公式烧结；
7)烧结完毕，冷却定型，取出芯轴3，对产品尺寸进行检验，获得成品。
在实际应用中，所述混合料的收缩率为0.5-1.2％，芯轴3、车外圆的直径要进行考虑。
在实际应用中，热量传导公式：104-200cal/c.sec.℃，烧结升温公式：按Φ100mm×10mm空心产品为标准，如产品放大或减小升降温率为：1mm＝1℃/H，30-130＝90℃/H，130-250＝70℃/H，250-320＝50℃/H，320-345＝40℃/H，345-375＝25℃/H；恒温工艺：130℃＝30-60min，250℃＝60min，320℃＝60-300min，345℃＝60-100min，375℃＝80-1000min，恒温主要根据烧结炉保温性能与产品大小来定，也可用热量传导公式换算。
空心Φ100mm×10mm程序如下：
相应地，一种用于制备高密度耐高温四氟管的模具，包括振动底座1、外模6、加粉口4、抽气口5、芯轴3、橡胶袋2，振动底座1上表面为圆形，中部有芯轴3定位孔7，芯轴3底端插入定位孔7；外模6为圆筒状，上部有上盖，外模6与芯轴3同轴放置，外模6可拆卸地安装在振动底座1上，芯轴3和外模6之间固定有橡胶袋2，外模6上表面布置有加粉孔，外模6侧面均有有多个抽气口5，抽气口5连接真空泵，外模6封闭时真空泵工作可形成负压将橡胶袋2吸附在外模6表面。
在实际应用中，所述外模6通过螺纹连接安装在振动底座1上。
在实际应用中，所述振动底座1采用电磁簸动。
综上所述，本发明生产的聚四氟乙烯管强度高、稳定性好，能耐250℃以上高温。
以上显示和描述了本发明的基本原理、主要特征及优点。本行业的技术人员应该了解，上述实施方式只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并加以实施，并不能以此限制本发明的保护范围，凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围内。

Claims (4)

1.一种高密度耐高温四氟管的制备方法，其特征在于：包括以下制备步骤：
1)称取高密度聚四氟乙烯粉、加石墨放入四氟专用混合机，石墨质量是聚四氟乙烯质量的5-8％，混合均匀，在90-110℃下，恒温搅拌25min，冷却至常温；
2)将混合后的粉末放入筛粉机，先用20目筛网过筛后，再用80目筛网过筛；
3)采用皮囊法，启动真空泵，通过抽气口(5)使模具外模(6)内壁形成负压，橡胶袋(2)扩张，将过筛后的粉末放入橡胶袋(2)内，放入速率为20-50g/min，放入同时振动底座(1)开启振动，振动频率为200次/min，振动幅度在3mm以内；
4)撤去外模(6)，将装满粉末的橡胶袋(2)密封，连同芯轴(3)取出，
放入高压釜内，将水压增大至30-35Mpa，橡胶袋(2)收缩，粉末挤压在芯轴(3)上；
5)取出成型件，利用仪表车床将外圆修至标准尺寸；
6)放入程控烧结炉，保护仪表设定为385℃，按照烧结升温公式烧结；
7)烧结完毕，冷却定型，取出芯轴(3)，对产品尺寸进行检验，获得成品。
2.一种用于制备高密度耐高温四氟管的模具，其特征在于：包括振动底座(1)、外模(6)、加粉口(4)、抽气口(5)、芯轴(3)、橡胶袋(2)，振动底座(1)上表面为圆形，中部有芯轴(3)定位孔(7)，芯轴(3)底端插入定位孔(7)；外模(6)为圆筒状，上部有上盖，外模(6)与芯轴(3)同轴放置，外模(6)可拆卸地安装在振动底座(1)上，芯轴(3)和外模(6)之间固定有橡胶袋(2)，外模(6)上表面布置有加粉孔，外模(6)侧面均有有多个抽气口(5)，抽气口(5)连接真空泵，外模(6)封闭时真空泵工作可形成负压将橡胶袋(2)吸附在外模(6)表面。
3.根据权利要求2所述的一种高密度耐高温四氟管模具，其特征在于：所述外模(6)通过螺纹连接安装在振动底座(1)上。
4.根据权利要求2所述的一种高密度耐高温四氟管模具，其特征在于：所述振动底座(1)采用电磁簸动。
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CN111873284A (zh) * 2020-07-07 2020-11-03 如皋佳百塑料制品有限公司 一种纯四氟乙烯喷嘴的一次模压成型方法及其专用模具

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