CN112571703A - 一种新型聚四氟乙烯生基片成型方法 - Google Patents

一种新型聚四氟乙烯生基片成型方法 Download PDF

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CN112571703A
CN112571703A CN202011286971.9A CN202011286971A CN112571703A CN 112571703 A CN112571703 A CN 112571703A CN 202011286971 A CN202011286971 A CN 202011286971A CN 112571703 A CN112571703 A CN 112571703A
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polytetrafluoroethylene
roller
raw substrate
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tension
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乔韵豪
赖占平
金霞
武聪
李宝珠
王丽婧
贾倩倩
张立欣
李强
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CETC 46 Research Institute
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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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of 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
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • 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
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • 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
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • B29C43/245—Adjusting calender parameters, e.g. bank quantity
    • 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
    • B29C43/58—Measuring, controlling or regulating
    • 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
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
    • 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
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5816—Measuring, controlling or regulating temperature
    • 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
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5825—Measuring, controlling or regulating dimensions or shape, e.g. size, thickness
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

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  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

本发明涉及一种新型聚四氟乙烯生基片成型方法，包括如下步骤：(1)聚四氟乙烯粉料在模具中加热、预压制得到生坯；(2)压延时，将步骤(1)预压得到的生坯缠绕于张力为30±0.5N的放料辊上与张力为28±0.5N收料辊上；(3)重复该步骤，且每次压延时放料辊与收料辊张力比上一次小2N，得到所需厚度的生基片。技术效果是聚四氟乙烯生基片厚度均一性良好，生基片厚度平均值为0.502，标准偏差为0.0049，并且大大降低了边缘开裂程度和褶皱，适合于工业化生产推广。

Description

一种新型聚四氟乙烯生基片成型方法
技术领域
本发明属于聚四氟乙烯生基片成型方法，特别涉及一种新型聚四氟乙烯生基片成型方法。
技术背景
随着无线电通信技术的迅猛发展，高频型号传输及信号处理设备的频率也从3G、4G快速发展至5G，这也对高频微波介电材料提出了更高的要求。聚四氟乙烯(PTFE)材料具有优异的介电性能(较低的介电常数和介电损耗)，以及良好的化学稳定性和热稳定性，使得其在微波介电材料中应用广泛。为了满足信号的优质传输，对原材料的制备、成型步骤提出更高的要求，而聚四氟乙烯压延后得到的生基片的质量直接影响成品的质量好坏。
传统的聚四氟乙烯压延成型工艺更多的只关注压延时，辊筒温度、辊筒转速、
辊间距对成型产品的影响，而忽略了压延时放料辊和压延辊间、收料辊和压延辊间的张力问题，容易导致制得的聚四氟乙烯生基片厚度均一性差，边缘易起褶皱等问题。其中CN 110039851 A描述了一种PTFE覆铜板的成型工艺，聚四氟乙烯粉料通过V混、模压、压延、烧结等步骤得到的覆铜板Dk值上下偏差±0.04%。
发明内容
本发明旨在提供一种聚四氟乙烯生基片成型方法，制得的生基片厚度均一性良好，边缘不开裂、无褶皱，降低了生基片裁切的废料率。本发明工艺方法简单、可大大降低压延过程中产生的废料率，为改良的聚四氟乙烯压延成型方法，适合于工业化生产推广。
本发明是通过以下技术方案实现的：一种新型聚四氟乙烯生基片成型方法，采用前加放料辊、收料辊的双辊压延机成型，其特征在于：包括如下步骤：
（1）、将过量3~8%的、粒径为50~500μm的四氟乙烯粉料填充于温度为50~60℃模具中，填入聚四氟乙烯粉料后无压力条件下保温3~5min，然后施加压力为15~35kgf/cm2，保压5~10min，制得厚度为4.5±0.2mm聚四氟乙烯生坯；
（2）、第一次压延，将预压得到的聚四氟乙烯生坯缠绕于放料辊上，聚四氟乙烯生坯张力为30±0.5N，穿过双辊压延机的压延辊，压延辊压力为400~500N，压延辊线速度为1~2m/min，辊距为500~1000μm，后缠绕于收料辊，聚四氟乙烯生坯张力为28±0.5N；
（3）、沿着同一方向重复压延，每次放料辊与收料辊上聚四氟乙烯生坯压延时张力比上一次压延时小2N，直至聚四氟乙烯生基片厚度为0.5±0.02mm，缠绕收料辊上最终得到所需厚度的生基片。
本发明的技术效果是，使聚四氟乙烯生基片厚度均一性良好，制得的生基片厚度标准偏差为0.0049；此外通过该方法大大降低了边缘开裂程度和褶皱。操作简单，成本低廉，适合于工业化生产推广。
生基片厚度平均值为0.502，标准偏差为0.0049，并且大大降低了边缘开裂程度和褶皱，适合于工业化生产推广。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将对本发明的技术方案进行详细的描述。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所得到的所有其它实施方式，都属于本发明所保护的范围。
以下采用三种聚四氟乙烯生坯制备方法，对比证明本发明的优点,
三种方法采用的四氟乙烯粉料均为二氧化硅填充聚四氟乙烯粉料，且粉料粒径为200μm（具体值）。模具温度均为55℃，填入聚四氟乙烯粉料后无压力条件下保温4min，然后施加压力为25kgf/cm2，保压5min。
以下对比试验采用的聚四氟乙烯压延成型时，均为双辊压延机，压延辊的压力为450N，压延辊线速度为1.5m/min，辊距为750μm。
实施例一
一种聚四氟乙烯生基片成型方法，包括如下步骤：
步骤(1)：将的二氧化硅填充四氟乙烯粉料过量5%（具体值）填充于模具中，制得厚度为4.5±0.2mm聚四氟乙烯生坯。
步骤(2)：将预压得到的聚四氟乙烯生坯直接穿过双辊压延机的压延辊压延，并且沿着同一方向反复压延，直至生基片的厚度为的0.5±0.02mm。
经检测得到的生基片厚度平均值为0.519，标准偏差为0.0145，且边缘有很多开裂、褶皱。
实施例二：
一种新型聚四氟乙烯生基片成型方法，包括如下步骤：
步骤(1)：将二氧化硅填充四氟乙烯粉料过量5%填充于模具中，制得厚度为4.5±0.2mm聚四氟乙烯生坯。
步骤(2)：将预压得到的聚四氟乙烯生坯缠绕于放料辊上，穿过双辊压延机的压延辊，最后缠绕于收料辊上，放料辊的张力为30N，收料辊的张力为28N，反复沿着同一方向压延，直至生基片的厚度为的0.5±0.02mm。
经检测得到的生基片厚度平均值为0.509，标准偏差为0.0078，且边缘基本无开裂、有少许褶皱。
实施例三：
一种新型聚四氟乙烯生基片成型方法，包括如下步骤：
步骤(1)：将二氧化硅填充四氟乙烯粉料过量5%填充于模具中，制得厚度为4.5±0.2mm聚四氟乙烯生坯。
步骤(2)：将预压得到的聚四氟乙烯生坯缠绕于放料辊上，穿过双辊压延机的压延辊，最后缠绕于收料辊上，放料辊的张力为30N，收料辊的张力为28N，反复沿着同一方向压延，且每次放料辊与收料辊每次压延时张力比上一次压延时小2N，直至生基片的厚度为的0.5±0.02mm。
经检测得到的生基片厚度平均值为0.502，标准偏差为0.0049，且边缘基本无开裂、无褶皱。

Claims (1)

1.一种新型聚四氟乙烯生基片成型方法，采用前加放料辊、收料辊的双辊压延机成型，其特征在于：包括如下步骤：
（1）、将过量3~8%的、粒径为50~500μm的四氟乙烯粉料填充于温度为50~60℃模具中，填入聚四氟乙烯粉料后无压力条件下保温3~5min，然后施加压力为15~35kgf/cm2，保压5~10min，制得厚度为4.5±0.2mm聚四氟乙烯生坯；
（2）、第一次压延，将预压得到的聚四氟乙烯生坯缠绕于放料辊上，聚四氟乙烯生坯张力为30±0.5N，穿过双辊压延机的压延辊，压延辊压力为400~500N，压延辊线速度为1~2m/min，辊距为500~1000μm，后缠绕于收料辊，聚四氟乙烯生坯张力为28±0.5N；
（3）、沿着同一方向重复压延，每次放料辊与收料辊上聚四氟乙烯生坯压延时张力比上一次压延时小2N，直至聚四氟乙烯生基片厚度为0.5±0.02mm，缠绕收料辊上最终得到所需厚度的生基片。
CN202011286971.9A 2020-11-17 2020-11-17 一种新型聚四氟乙烯生基片成型方法 Pending CN112571703A (zh)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09155901A (ja) * 1995-12-07 1997-06-17 Nippon Petrochem Co Ltd プラスチックフィルムの圧延方法及び圧延装置
CN202241751U (zh) * 2011-10-12 2012-05-30 天津市天塑滨海氟塑料制品有限公司 用于生产聚四氟乙烯薄膜的二联辊压延机
CN106927296A (zh) * 2017-05-12 2017-07-07 天津市天塑科技集团有限公司 一种聚四氟乙烯低密度薄膜拉伸装置及制备方法
CN210233740U (zh) * 2019-07-02 2020-04-03 浙江交联辐照材料股份有限公司 一种聚乙烯超薄片压延机
CN112140440A (zh) * 2019-06-27 2020-12-29 安徽省众望科希盟科技有限公司 一种压延膜厚度自动控制方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09155901A (ja) * 1995-12-07 1997-06-17 Nippon Petrochem Co Ltd プラスチックフィルムの圧延方法及び圧延装置
CN202241751U (zh) * 2011-10-12 2012-05-30 天津市天塑滨海氟塑料制品有限公司 用于生产聚四氟乙烯薄膜的二联辊压延机
CN106927296A (zh) * 2017-05-12 2017-07-07 天津市天塑科技集团有限公司 一种聚四氟乙烯低密度薄膜拉伸装置及制备方法
CN112140440A (zh) * 2019-06-27 2020-12-29 安徽省众望科希盟科技有限公司 一种压延膜厚度自动控制方法
CN210233740U (zh) * 2019-07-02 2020-04-03 浙江交联辐照材料股份有限公司 一种聚乙烯超薄片压延机

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Application publication date: 20210330