CN117344552A - 一种高耐磨、高硬度平纹布及其制备方法与应用、压合缓冲垫的制备方法 - Google Patents
一种高耐磨、高硬度平纹布及其制备方法与应用、压合缓冲垫的制备方法 Download PDFInfo
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Abstract
本发明涉及压合缓冲垫技术领域,具体涉及一种高耐磨、高硬度平纹布及其制备方法与应用、压合缓冲垫的制备方法。所述平纹布包括玻璃纤维平纹布和涂覆在玻璃纤维平纹布表面的改性聚四氟乙烯层,其中,按重量份计,所述改性聚四氟乙烯层的原料组合物包括:水10‑25份、聚四氟乙烯乳液30‑45份、填料20‑40份、淀粉醚2‑3份、增稠剂0.5‑1份、偶联剂0.2‑0.6份、表面活性剂0.03‑0.05份。本发明的平纹布具有优异的耐磨性和高硬度,将其用于压合缓冲垫中能够增加压合缓冲垫的使用寿命。
Description
技术领域
本发明涉及压合缓冲垫技术领域,具体涉及一种高耐磨、高硬度平纹布及其制备方法与应用、压合缓冲垫的制备方法。
背景技术
随着科技的进步,印制电路板成为了电子器械中线路板中不可或缺的一部分,在线路板中的压合缓冲垫能够起到均匀分配压力等作用,平纹布用于压合缓冲垫的表面,当作压合缓冲垫的上下表布。当压合缓冲垫在热压机压合过程中尤其是覆铜板压合制程(CCL)中,客户对压合后的板料的尺寸厚度均匀性有极高要求(要求在整个板面2.0m*1.3m*1mm的范围,厚度变化公差<0.015mm),所以要求作为缓冲物质的压合缓冲垫自身需要有极佳的厚度均匀性,压合缓冲垫表面不能有任何起伏变化,因此需要一款硬度较高,平纹的表布。
发明内容
本发明的目的是为了提供一种高耐磨、高硬度平纹布及其制备方法与应用、压合缓冲垫的制备方法。
本发明第一方面提供了一种高耐磨、高硬度平纹布,所述平纹布包括玻璃纤维平纹布和涂覆在玻璃纤维平纹布表面的改性聚四氟乙烯层,其中,按重量份计,所述改性聚四氟乙烯层的原料组合物包括:水10-25份、聚四氟乙烯乳液30-45份、填料20-40份、淀粉醚2-3份、增稠剂0.5-1份、偶联剂0.2-0.6份、表面活性剂0.03-0.05份。
在本发明中,玻璃纤维平纹布可选用本领域常规的电子级玻璃纤维平纹布,其厚度可根据需要进行选择,例如为0.2-0.3mm。
聚四氟乙烯乳液是聚四氟乙烯的水分散液,其具有耐酸、耐碱、耐高温的特性,在一些实施方式中,所述聚四氟乙烯乳液的浓度为35-55wt%。
在本发明中填料能够增加平纹布的硬度,在一些实施方式中,所述填料选自陶瓷粉末、二氧化硅粉末、云母粉、玻璃微珠和滑石粉中的至少一种。
在一些优选的实施方式中,所述填料为二氧化硅粉末与滑石粉的组合,优选所述二氧化硅粉末与滑石粉的质量比为(0.1-1):1,优选为(0.5-1):1。
在本发明中,发明人经过大量研究实验发现使用特定的二氧化硅粉末与滑石粉作为填料协同作用不但能够更好地增加平纹布的硬度,而且还能进一步增加平纹布制品的耐磨性和力学性能,发明人推测可能是因为滑石粉具有层状结构,在改性聚四氟乙烯层的原料体系中起到固体润滑剂的作用,可以减缓摩擦材料和对制品表面之间的直接摩擦阻力。
在一些更优选的实施方式中,所述二氧化硅粉末的粒径为5-10μm。
在一些更优选的实施方式中,所述滑石粉的粒径为20-32μm。
在本发明中,使用粒径不同二氧化硅粉末与滑石粉相互协同作用能够更好地增加制品的力学性能,可能是因为不同粒径的二氧化硅粉末与滑石粉能够更好地增加体系的致密性。
在一些实施方式中,所述淀粉醚选自羟丙基淀粉醚和/或羟乙基淀粉醚。
填料虽然能够增加制品的硬度和力学性能,但发明人在试验中发现,其会导致制品的厚度均匀性差,发明人意外发现使用淀粉醚能够改善制品的厚度均匀性,可能是因为淀粉醚有较强的分子极性,在原料体系中,能够在填料表面形成光滑稳定的保护层,形成的保护层能够减弱了填料之间的摩擦力,使得在形成改性聚四氟乙烯层时,填料尤其是不同粒径的二氧化硅粉末与滑石粉能够更均匀稳定地分散在体系中;同时淀粉醚与增稠剂相互协同作用能够更好地改善乳液的粘稠度,更好地改善与玻璃纤维布之间的原纸的粘接强度。
在一些实施方式中,所述增稠剂选自羧甲基纤维素钠、羟乙基瓜尔胶、聚乙烯醇和羟丙基纤维素中的至少一种。
在一些优选的实施方式中,增稠剂为羟乙基瓜尔胶与羟丙基纤维素的组合,优选羟乙基瓜尔胶与羟丙基纤维素的重量比为(0.8-1.5):1,优选为(0.8-1.2):1。
单独淀粉醚的加入可能会导致体系中一部分气体难以排出,导致制品的力学性能降低,本发明中使用特定的羟乙基瓜尔胶与羟丙基纤维素作为增稠剂能够更好地与淀粉醚协同作用改善乳液的粘稠度,同时羟乙基瓜尔胶和/或遇水膨胀效应使本发明中原料组合物能够更快地溶散,排除体系中的气体。
在一些实施方式中,所述偶联剂选自硅烷偶联剂,优选所述硅烷偶联剂选自KH550、KH560、KH570和KH792中的至少一种。
在一些实施方式中,所述表面活性剂为脱水山梨醇的酯和/或C8-C18脂肪酸,优选为C8-C18脂肪酸,进一步优选为C10-C14脂肪酸,更进一步优选为C12月桂酸。
聚四氟乙烯大分子很难流动,对玻璃纤维的润湿性差,加工成型比较困难,在本发明中使用表面活性剂,尤其是C8-C18脂肪酸作为表面活性剂与偶联剂协同作用能够增加填料在体系中的分散程度,在原料组合物混合的过程中,脂肪酸链在体系中不断扩散、渗透,抑制形成致气泡导致周围应力失衡,更好地增加制品的力学性能以及厚度均匀性。
本发明第二方面提供了所述高耐磨、高硬度平纹布的制备方法,该制备方法包括:
(1)将改性聚四氟乙烯层的原料组合物混合后得到的胶料送入上胶机的胶液循环系统中;
(2)玻璃纤维平纹布浸润在步骤(1)的胶料中;
(3)将浸渍后的玻璃纤维平纹布在烘干。
步骤(1)中,所述混合的方式没有特殊限定,优选在50-60℃下搅拌1-3h。
在一些实施方式中,所述玻璃纤维平纹布按40-50cm/min的速度浸润在步骤(1)的胶料中。
在一些实施方式中,所述改性聚四氟乙烯层胶料的涂覆量为80-150g/m2,在发明中,可通过挤压辊的挤压把多余胶料排除。
在一些实施方式中,步骤(3)中烘干的条件包括:烘干温度为220-250℃、烘干时间为15-40min。
在一些实施方式中,步骤(3)中烘干后还可根据需要进行裁切卷曲成成品。
本发明第三方面提供了本发明所述高耐磨、高硬度平纹布在压合缓冲垫中的应用。
在本发明一种优选的实施方式中,所述压合缓冲垫用于覆铜板压合制程(CCL)中。
压合缓冲垫在热压机压合过程中尤其是覆铜板压合制程(CCL)中,对压合后的板料的尺寸厚度均匀性有极高要求,例如要求在整个板面2.0m*1.3m*1mm的范围,厚度变化公差<0.015mm,本发明中的平纹布具有高的硬度、厚度均匀性以及耐磨性,使用压合缓冲垫表面几乎没有任何起伏变化,压合缓冲垫的表面的耐磨性能极佳。
本发明第四方面提供了一种压合缓冲垫的制备方法,其中,该制备方法包括:将本发明所述的高耐磨、高硬度平纹布通过胶黏剂分别粘结在有机纤维编织层上下表面。
在本发明中,所述胶黏剂的种类没有特殊限定,优选为耐高温的胶黏剂,例如可以为耐高温的聚氨酯胶黏剂、耐高温的有机硅胶黏剂,本发明对此无特殊限制,本发明中使用重量比为1:1的聚氨酯胶黏剂与有机硅胶黏剂作为本发明中的胶黏剂。
在本发明中,有机纤维编织层的具体种类和厚度可以根据需要进行选择,例如有机纤维编织层为凯夫拉1414纤维或凯夫拉1313纤维,厚度可以为4-8mm。
与现有技术相比,本发明至少具有下述有益效果:
1、本发明的平纹布制品具有较高的硬度,并且将本发明的平纹布制品用于压合缓冲垫中,使得压合缓冲垫在客户端自动化吸吊的过程,下垂的程度较轻微,避免了吸吊不起来的问题以及吸吊起来下垂程度较大,压合缓冲垫在移动过程中因下垂程度较大被其他机械构造刮伤碰伤的情况;
2、本发明的平纹布制品的厚度均匀,将其用于压合缓冲垫中使得压合缓冲垫的厚度均匀性大幅提升;
3、本发明的平纹布制品具有优异的耐磨性,将其用于压合缓冲垫中,能够使得压合缓冲垫压使用寿命达到800次以上的要求。
附图说明
图1为自动化吸吊的设备的示意图。
具体实施方式
下面通过实施例对本发明进行详细,以下实施例只是对本发明具体的技术方案的示例性说明,并不限制本发明的范围,即应当理解的是本领域技术人员根据本发明的发明构思作出的非本质的简单改正、调整和组合都在本发明要求保护的范围内。
实施例1
改性聚四氟乙烯层的原料组合物准备:按重量份计,准备:水15份、浓度为40wt%的聚四氟乙烯乳液35份、粒径为5μm的二氧化硅粉末10份、粒径为30μm的滑石粉20份、羟丙基淀粉醚2份、羟乙基瓜尔胶0.4份、羟丙基纤维素0.4份、0.5份的KH550、0.05份的C12月桂酸;
准备厚度为0.24mm的电子级玻璃纤维平纹布;
高耐磨、高硬度平纹布的制备:
(1)将改性聚四氟乙烯层的原料组合物在60℃下搅拌1h得到的胶料,将胶料输送上胶机的胶液循环系统中,
(2)上胶机将电子级玻璃纤维平纹布按45cm/min的速度匀速浸润在步骤(1)中制备的胶料中,经过挤压辊的挤压把多余胶液排除,使得胶液的涂覆量为120g/m2;
(3)将浸渍后的电子级玻璃纤维平纹布在烘箱220℃烘干,烘干时间为25min,之后裁切卷取成成品高耐磨、高硬度平纹布。
实施例2
改性聚四氟乙烯层的原料组合物准备:按重量份计,准备:水20份、浓度为50wt%的聚四氟乙烯乳液45份、粒径为5μm的二氧化硅粉末15份、粒径为30μm的滑石粉20份、羟丙基淀粉醚3份、羟乙基瓜尔胶0.5份、羟丙基纤维素0.5份、0.6份的KH550、0.05份的C12月桂酸;
准备厚度为0.24mm的电子级玻璃纤维平纹布;
高耐磨、高硬度平纹布的制备:
(1)将改性聚四氟乙烯层的原料组合物在60℃下搅拌1h得到的胶料,将胶料输送上胶机的胶液循环系统中,
(2)上胶机将电子级玻璃纤维平纹布按50cm/min的速度匀速浸润在步骤(1)中制备的胶料中,经过挤压辊的挤压把多余胶液排除,使得胶液的涂覆量为120g/m2;
(3)将浸渍后的电子级玻璃纤维平纹布在烘箱230℃烘干,烘干时间为20min,之后裁切卷取成成品高耐磨、高硬度平纹布。
实施例3
改性聚四氟乙烯层的原料组合物准备:按重量份计,准备:水10份、浓度为35wt%的聚四氟乙烯乳液30份、粒径为5μm的二氧化硅粉末20份、粒径为30μm的滑石粉20份、羟丙基淀粉醚2份、羟乙基瓜尔胶0.3份、羟丙基纤维素0.4份、0.5份的KH550、0.05份的C12月桂酸;
准备厚度为0.24mm的电子级玻璃纤维平纹布;
高耐磨、高硬度平纹布的制备:
(1)将改性聚四氟乙烯层的原料组合物在60℃下搅拌1h得到的胶料,将胶料输送上胶机的胶液循环系统中,
(2)上胶机将电子级玻璃纤维平纹布按50cm/min的速度匀速浸润在步骤(1)中制备的胶料中,经过挤压辊的挤压把多余胶液排除,使得胶液的涂覆量为120g/m2;
(3)将浸渍后的电子级玻璃纤维平纹布在烘箱230℃烘干,烘干时间为20min,之后裁切卷取成成品高耐磨、高硬度平纹布。
实施例4
改性聚四氟乙烯层的原料组合物准备:按重量份计,准备:水15份、浓度为40wt%的聚四氟乙烯乳液35份、粒径为5μm的二氧化硅粉末10份、粒径为30μm的滑石粉20份、羟乙基瓜尔胶0.4份、羟丙基纤维素0.4份、0.5份的KH550、0.05份的C12月桂酸;
准备厚度为0.24mm的电子级玻璃纤维平纹布;
高耐磨、高硬度平纹布的制备同实施例1,最终制备得到高耐磨、高硬度平纹布。
实施例5
改性聚四氟乙烯层的原料组合物准备:按重量份计,准备:水15份、浓度为40wt%的聚四氟乙烯乳液35份、粒径为5μm的二氧化硅粉末10份、粒径为30μm的滑石粉20份、羟丙基淀粉醚2份、羟乙基瓜尔胶0.4份、羟丙基纤维素0.4份、0.5份的KH550;
准备厚度为0.24mm的电子级玻璃纤维平纹布;
高耐磨、高硬度平纹布的制备同实施例1,最终制备得到高耐磨、高硬度平纹布。
实施例6
改性聚四氟乙烯层的原料组合物准备:按重量份计,准备:水15份、浓度为40wt%的聚四氟乙烯乳液35份、粒径为5μm的二氧化硅粉末30份、羟丙基淀粉醚2份、羟乙基瓜尔胶0.4份、羟丙基纤维素0.4份、0.5份的KH550、0.05份的C12月桂酸;
准备厚度为0.24mm的电子级玻璃纤维平纹布;
高耐磨、高硬度平纹布的制备同实施例1,最终制备得到高耐磨、高硬度平纹布。
性能测试
压合缓冲垫样品的制备:准备厚度为8mm的凯夫拉芳纶1313纤维层,在凯夫拉芳纶1313纤维层上下两侧面涂覆耐高温的胶黏剂(重量比为1:1的聚氨酯胶黏剂与有机硅胶黏剂),然后高耐磨、高硬度平纹布粘结在凯夫拉芳纶1313纤维层上下两面,形成压合缓冲垫。
1、厚度测试:分别测试实施例和对比例中所得的平纹布不同位置的厚度(a1、a3分别为对角线上两个边角位置的厚度,a2为平纹布中心位置的厚度),测试结果如表2所示。
2、力学性能测试:分别测试实施例和对比例中所得平纹布的纵向拉力和横向拉力,测试结果如表2所示。
3、耐磨性:使用钢丝绒(酒精)分别对实施例和对比例中的平纹布进行摩擦,测试摩擦多少次后,平纹布出现破损,测试结果如表2所示。
4、硬度测试:分别测试实施例和对比例中所得平纹布的表面硬度;
5、压合缓冲垫下垂测试:分别对压合缓冲垫样品在客户端自动化吸吊的过程的进行下垂程度进行测试,测试条件如表1所示,自动化吸吊的设备的示意图如图1所示,下垂程度的结果如表2所示。
表1
表2
通过以上实施例说明了本发明的高耐磨、高硬度平纹布有极佳的厚度均匀性,能够满足压合缓冲垫压的使用,同时能够满足压合缓冲垫压合使用寿命达到800次以上的要求,将其用于压合缓冲垫中,压合缓冲垫的表面(表布)耐磨性能极佳。
Claims (10)
1.一种高耐磨、高硬度平纹布,其特征在于,所述平纹布包括玻璃纤维平纹布和涂覆在玻璃纤维平纹布表面的改性聚四氟乙烯层;
其中,按重量份计,所述改性聚四氟乙烯层的原料组合物包括:水10-25份、聚四氟乙烯乳液30-45份、填料20-40份、淀粉醚2-3份、增稠剂0.5-1份、偶联剂0.2-0.6份、表面活性剂0.03-0.05份。
2.根据权利要求1所述的平纹布,其特征在于,所述填料选自陶瓷粉末、二氧化硅粉末、云母粉、玻璃微珠和滑石粉中的至少一种。
3.根据权利要求1或2所述的平纹布,其特征在于,所述淀粉醚选自羟丙基淀粉醚和/或羟乙基淀粉醚。
4.根据权利要求1或2所述的平纹布,其特征在于,所述增稠剂选自羧甲基纤维素钠、羟乙基瓜尔胶、聚乙烯醇和羟丙基纤维素中的至少一种。
5.根据权利要求1或2所述的平纹布,其特征在于,所述偶联剂选自硅烷偶联剂;所述表面活性剂为脱水山梨醇的酯和/或C8-C18脂肪酸。
6.一种权利要求1-5中任意一项所述高耐磨、高硬度平纹布的制备方法,其特征在于,该制备方法包括:
(1)将改性聚四氟乙烯层的原料组合物混合后得到的胶料送入上胶机的胶液循环系统中;
(2)玻璃纤维平纹布浸润在步骤(1)的胶料中;
(3)将浸渍后的玻璃纤维平纹布在烘干。
7.根据权利要求6所述的制备方法,其特征在于,所述玻璃纤维平纹布按40-50cm/min的速度浸润在步骤(1)的胶料中。
8.根据权利要求6或7所述的制备方法,其特征在于,所述改性聚四氟乙烯层胶料的涂覆量为80-150g/m2。
9.权利要求1-5中任意一项所述高耐磨、高硬度平纹布在压合缓冲垫中的应用。
10.一种压合缓冲垫的制备方法,其特征在于,该制备方法包括:将权利要求1-5中任意一项所述高耐磨、高硬度平纹布通过胶黏剂分别粘结在有机纤维编织层上下表面。
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