CN113165332B - 电工钢板及其制造方法 - Google Patents

电工钢板及其制造方法 Download PDF

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CN113165332B
CN113165332B CN201980079004.4A CN201980079004A CN113165332B CN 113165332 B CN113165332 B CN 113165332B CN 201980079004 A CN201980079004 A CN 201980079004A CN 113165332 B CN113165332 B CN 113165332B
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surface adhesive
adhesive layer
resin
electrical steel
steel sheet
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CN113165332A (zh
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河奉宇
金正雨
卢泰英
李同揆
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Posco Holdings Inc
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Posco Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09J175/00Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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    • C09J5/00Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/04Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving separate application of adhesive ingredients to the different surfaces to be joined
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    • B32B15/01Layered products comprising a layer of metal all layers being exclusively metallic
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    • B32B15/04Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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  • Chemical & Material Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
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  • Laminated Bodies (AREA)
  • Soft Magnetic Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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Abstract

根据本发明的一个实施例的电工钢板,其包含位于电工钢板上表面的上表面粘合层;位于电工钢板下表面的下表面粘合层,上表面粘合层的铅笔硬度为F以下,下表面粘合层的铅笔硬度为H以上。

Description

电工钢板及其制造方法
技术领域
本发明涉及一种电工钢板及其制造方法。更具体地,本发明涉及一种电工钢板及其制造方法,通过在电工钢板上表面和下表面上形成不同种类的粘合层来确保优异的粘合性和表面特性。
背景技术
电工钢板是用作变压器、电动机和电气设备材料的产品,不同于重视机械特性等加工性的普通碳钢,电工钢板是一种重视电特性的功能性产品。所要求的电特性有低铁损、高磁通密度、高磁导率和高占空比。
电工钢板又分为取向电工钢板和无取向电工钢板。取向电工钢板利用被称为二次再结晶的异常晶粒生长现象在整体钢板中形成高斯织构({110}<001>织构),从而在轧制方向上具有优异的磁特性。无方向性电工钢板是在轧制板的所有方向上具有均匀的磁特性的电工钢板。
电工钢板分为两种类型,一种是需要实施去应力退火(SRA),以改善冲裁加工后的磁特性,另一种是热处理所造成的成本损失大于SRA所带来的磁特性改善效果时,省略SRA。
另一方面,形成绝缘膜层是相当于产品的最终制造工艺的过程,除了通常抑制产生涡电流的电特性之外,还要求冲裁加工成预定形状后将它们堆叠在一起制作铁芯时抑制模具磨损的连续冲裁加工性、消除钢板的加工应力使磁特性恢复的SRA过程后铁芯钢板之间不会粘附的抗粘结性和表面附着性等。除了这些特性之外,还要求涂覆溶液的优异的涂覆操作性和混合后可长时间使用的溶液稳定性等。
另外,还知道有一种粘合涂层,可以粘合(连接)电工钢板,而不使用焊接、夹固、联锁等现有的连接方法。
发明内容
(一)要解决的技术问题
本发明提供一种电工钢板及其制造方法。更具体地,本发明提供一种电工钢板及其制造方法,通过在电工钢板上表面和下表面上形成不同种类的粘合层来确保优异的粘合性和表面特性。
(二)技术方案
根据本发明的一个实施例的电工钢板,其包含位于电工钢板上表面的上表面粘合层和位于电工钢板下表面的下表面粘合层,上表面粘合层的铅笔硬度为F以下,下表面粘合层的铅笔硬度为H以上。
上表面粘合层包含羟基当量为1至10mgKOH/g的树脂,下表面粘合层包含羟基当量为15至20mgKOH/g的树脂。
上表面粘合层可包含重均分子量为15000至50000的树脂,下表面粘合层可包含重均分子量为1000至10000的树脂。
上表面粘合层还可包含3重量%以下的固化剂,下表面粘合层还可包含5至10重量%的固化剂。
上表面粘合层的铅笔硬度可为F以下,下表面粘合层的铅笔硬度可为H以上。
树脂可包含环氧树脂、硅氧烷树脂、丙烯酸树脂、酚醛树脂、苯乙烯树脂、乙烯基树脂(vinyl resin)、乙烯树脂(ethylene resin)、酯树脂和氨基甲酸酯(urethane)树脂中的一种以上。
固化剂可包含三聚氰胺固化剂、氨基甲酸酯固化剂、脂肪族多胺固化剂、改性脂肪族多胺固化剂、芳香族多胺固化剂和有机酸酐固化剂中的一种以上。
根据本发明的一个实施例的电工钢板的制造方法,其包含:将上表面粘合组合物涂覆在电工钢板上表面上以形成上表面粘合层的步骤;将下表面粘合组合物涂覆在电工钢板下表面上以形成下表面粘合层的步骤,上表面粘合组合物包含羟基当量为1至10mgKOH/g的树脂,下表面粘合组合物包含羟基当量为15至20mgKOH/g的树脂。
上表面粘合组合物可包含重均分子量为15000至50000的树脂,下表面粘合组合物可包含重均分子量为1000至10000的树脂。
相对于固形物100重量%,上表面粘合组合物还可包含3重量%以下的固化剂,相对于固形物100重量%,下表面粘合组合物还可包含5至10重量%的固化剂。
根据本发明的一个实施例的电工钢板层叠体,其层叠有多个电工钢板,电工钢板之间依序夹置上表面粘合层和下表面粘合层。
上表面粘合层的铅笔硬度为F以下,下表面粘合层的铅笔硬度为H以上。
上表面粘合层可包含重均分子量为15000至50000的树脂,下表面粘合层可包含重均分子量为1000至10000的树脂。
上表面粘合层还可包含3重量%以下的固化剂,下表面粘合层还可包含5至10重量%的固化剂。
上表面粘合层包含羟基当量为1至10mgKOH/g的树脂,下表面粘合层包含羟基当量为15至20mgKOH/g的树脂。
(三)有益效果
根据本发明的一个实施方案,可以确保优异的表面特性和粘合力。
附图说明
图1是根据本发明的一个实施例的电工钢板的截面示意图。
图2是根据本发明的一个实施例的电工钢板层叠体的截面示意图。
具体实施方式
第一、第二、第三等词汇用于描述各部分、成分、区域、层和/或段,但这些部分、成分、区域、层和/或段不应该被这些词汇限制。这些词汇仅用于区分某一部分、成分、区域、层和/或段与另一部分、成分、区域、层和/或段。因此,在不脱离本发明的范围内,下面描述的第一部分、成分、区域、层和/或段也可以被描述为第二部分、成分、区域、层和/或段。
本文所使用的术语只是出于描述特定实施例,并不意在限制本发明。除非上下文中另给出明显相反的含义,否则本文所使用的单数形式也意在包含复数形式。在说明书中使用的“包含”可以具体指某一特性、领域、整数、步骤、动作、要素及/或成分,但并不排除其他特性、领域、整数、步骤、动作、要素、成分及/或组的存在或附加。
如果某一部分被描述为在另一个部分之上,则可以直接在另一个部分上面或者其间存在其他部分。当某一部分被描述为直接在另一个部分上面时,其间不存在其他部分。
虽然没有另作定义,但是本文中使用的所有术语(包含技术术语和科学术语)的含义与本发明所属领域的普通技术人员通常理解的意思相同。对于辞典中定义的术语,应该被解释为具有与相关技术文献和本文中公开的内容一致的意思,而不应该以理想化或过于正式的含义来解释它们的意思。
在下文中,将详细描述本发明的实施例,以使本发明所属领域的普通技术人员容易实施本发明。然而,本发明能够以各种不同方式实施,并不限于本文所述的实施例。
图1中示意性地示出根据本发明的一个实施例的电工钢板的截面。参照图1描述根据本发明的一个实施例的电工钢板的结构。图1的电工钢板只是用于例示本发明,本发明不限于此。因此,可以对电工钢板的结构进行各种变形。
如图1所示,根据本发明的一个实施例的电工钢板,其包含位于电工钢板10上表面的上表面粘合层20和位于电工钢板10下表面的下表面粘合层30。
电工钢板10可以是无取向电工钢板或取向电工钢板。在本发明的一个实施例中,对于电工钢板10的合金成分,可以不受限制地使用。作为一个实例,以重量%计,电工钢板10可包含C:0.1%以下、Si:6.0%以下、P:0.5%以下、S:0.005%以下、Mn:1.0%以下、Al:2.0%以下、N:0.005%以下、Ti:0.005%以下、Cr:0.5%以下,余量包含Fe和不可避免的杂质。
上表面粘合层20位于电工钢板10的上表面。
上表面粘合层20包含羟基当量为1至10mgKOH/g的树脂。如果树脂包含适量的羟基,则电工钢板10层叠成层叠体100时,可以提高与下表面粘合层30的粘合力。通过提高粘合力,在不使用焊接、夹固、联锁等现有的连接方法的情况下,可以粘合电工钢板,由于钢板不会变形,磁性得到改善。
如果羟基当量过高,则与下表面粘合层30的粘合力可能会降低。如果羟基当量过低,则生产产品后卷取成卷板时可能会产生上表面粘合层20和下表面粘合层30粘在一起的缺陷。更具体地,上表面粘合层20可包含羟基当量为3至5mgKOH/g的树脂。此时,羟基(-OH)当量是指相对于树脂重量的羟基(-OH)的重量,由干燥固形物1g可乙酰化之酸值中和所需的KOH的重量求出。
上表面粘合层20可包含重均分子量为15000至50000的树脂。当包含分子量适当的树脂时,可以提高与下表面粘合层30的粘合力。如果重均分子量过低,则与下表面粘合层30的粘合力可能会降低。
如果重均分子量过高,则生产产品后卷取成卷板时可能会产生上表面粘合层20和下表面粘合层30粘在一起的缺陷。更具体地,上表面粘合层20可包含重均分子量为20000至40000的树脂。
上表面粘合层20还可包含3重量%以下的固化剂。固化剂可以是0重量%(即,也可以不包含)。当固化剂含量过多时,与下表面粘合层30的粘合力可能会降低。固化剂之外的余量可以是树脂。更具体地,可以不包含固化剂。也就是说,上表面粘合层20可以仅由树脂组成。
上表面粘合层20的铅笔硬度可为F以下。铅笔硬度可以通过用标准铅笔在500g的荷重下以45度角划线后肉眼确认涂层表面上有无压痕的方式进行测定。将没有产生压痕的最高硬度定义为粘合层的硬度。更具体地,上表面粘合层20的铅笔硬度可为B至F。
树脂的种类不受特别限制。例如,树脂可包含环氧树脂、硅氧烷树脂、丙烯酸树脂、酚醛树脂、苯乙烯树脂、乙烯基树脂、乙烯树脂、酯树脂和氨基甲酸酯树脂中的一种以上。更具体地,可包含环氧树脂、酯树脂、氨基甲酸酯树脂和丙烯酸树脂中的一种以上。
固化剂可包含三聚氰胺固化剂、氨基甲酸酯固化剂、脂肪族多胺固化剂、改性脂肪族多胺固化剂、芳香族多胺固化剂和有机酸酐固化剂中的一种以上。
脂肪族多胺固化剂可以是二亚乙基三胺、三亚乙基四胺等。改性脂肪族多胺固化剂可以是环氧多胺、氧乙烯多胺等。芳香族多胺固化剂可以是间苯二胺、二氨基二苯甲烷、二氨基二苯砜等。有机酸酐固化剂可以是四氢邻苯二甲酸酐、均苯四酸酐等。
除了前述的树脂和固化剂之外,还可包含金属磷酸盐、金属铬酸盐。
下表面粘合层30位于电工钢板10的下表面。
下表面粘合层30包含羟基当量为15至20mgKOH/g的树脂。如果树脂包含适量的羟基,则电工钢板10层叠成层叠体100时,可以提高与上表面粘合层20的粘合力。同时,对于下表面粘合层30,可以防止生产时生产线的刮痕形缺陷。生产电工钢板时,输送电工钢板的滚轮与下表面接触。此时,如果下表面粘合层30的羟基当量过低,则可能会产生多个刮痕形缺陷。
下表面粘合层30可包含重均分子量为1000至10000的树脂。当包含分子量适当的树脂时,可以提高与上表面粘合层20的粘合力。如果重均分子量过低,则与上表面粘合层20的粘合力可能会降低。
如果重均分子量过高,则可能会产生多个刮痕形缺陷。更具体地,下表面粘合层30可包含重均分子量为1500至5000的树脂。更具体地,下表面粘合层30可包含重均分子量为2000至3000的树脂。
下表面粘合层30还可包含5至10重量%的固化剂。当固化剂含量过多时,与上表面粘合层20的粘合力可能会降低。当固化剂含量过少时,可能会产生多个刮痕形缺陷。固化剂之外的余量可以是树脂。更具体地,固化剂可包含5至8重量%。
下表面粘合层30的铅笔硬度可为H以上。铅笔硬度可以通过用标准铅笔在500g的荷重下以45度角划线后肉眼确认涂层表面上有无压痕的方式进行测定。将没有产生压痕的最高硬度定义为粘合层的硬度。更具体地,下表面粘合层30的铅笔硬度可为H至4H。更具体地,下表面粘合层30的铅笔硬度可为H至3H。
树脂的种类不受特别限制。例如,树脂可包含环氧树脂、硅氧烷树脂、丙烯酸树脂、酚醛树脂、苯乙烯树脂、乙烯基树脂、乙烯树脂、酯树脂和氨基甲酸酯树脂中的一种以上。更具体地,可包含环氧树脂、酯树脂、氨基甲酸酯树脂和丙烯酸树脂中的一种以上。可以与前述的上表面粘合层20的树脂相同或不同。
固化剂可包含三聚氰胺固化剂、氨基甲酸酯固化剂、脂肪族多胺固化剂、改性脂肪族多胺固化剂、芳香族多胺固化剂和有机酸酐固化剂中的一种以上。可以与前述的上表面粘合层20的固化剂相同或不同。
除了前述的树脂和固化剂之外,还可包含金属磷酸盐、金属铬酸盐。
上表面粘合层20和下表面粘合层30的厚度分别可为1至10μm。
根据本发明的一个实施例的电工钢板的制造方法,其包含:将上表面粘合组合物涂覆在电工钢板上表面上以形成上表面粘合层的步骤;以及将下表面粘合组合物涂覆在电工钢板下表面上以形成下表面粘合层的步骤。
下面按照各步骤具体描述。
将上表面粘合组合物涂覆在电工钢板10上表面上,以形成上表面粘合层20。
上表面粘合组合物包含羟基当量为1至10mgKOH/g的树脂。如果树脂适量包含羟基,则电工钢板10层叠成层叠体100时,可以提高与下表面粘合层30的粘合力。通过提高粘合力,在不使用焊接、夹固、联锁等现有的连接方法的情况下,可以粘合电工钢板,由于钢板不会变形,磁性得到改善。
如果羟基当量过高,则与下表面粘合层30的粘合力可能会降低。如果羟基当量过低,则生产产品后卷取成卷板时可能会产生上表面粘合层20和下表面粘合层30粘在一起的缺陷。更具体地,上表面粘合组合物可包含羟基当量为3至5mgKOH/g的树脂。此时,羟基(-OH)当量是指相对于树脂重量的羟基(-OH)的重量,由干燥固形物1g可乙酰化之酸值中和所需的KOH的重量求出。
上表面粘合组合物可包含重均分子量为15000至50000的树脂。当包含分子量适当的树脂时,可以提高与下表面粘合层30的粘合力。如果重均分子量过高,则生产产品后卷取成卷板时可能会产生上表面粘合层20和下表面粘合层30粘在一起的缺陷。更具体地,上表面粘合组合物可包含重均分子量为20000至40000的树脂。
相对于固形物100重量%,上表面粘合组合物还可包含3重量%以下的固化剂。固化剂可以是0重量%(即,也可以不包含)。当固化剂含量过多时,与下表面粘合层30的粘合力可能会降低。固化剂之外的余量可以是树脂。更具体地,可以不包含固化剂。也就是说,上表面粘合组合物的固形物可以仅由树脂组成。除了固形物之外,上表面粘合组合物还可包含溶剂。溶剂可以使用涂层组合物中使用的一般溶剂,省略具体的描述。例如,溶剂可包含水和有机溶剂中的一种以上。
树脂的种类不受特别限制。例如,树脂可包含环氧树脂、硅氧烷树脂、丙烯酸树脂、酚醛树脂、苯乙烯树脂、乙烯基树脂、乙烯树脂、酯树脂和氨基甲酸酯树脂中的一种以上。更具体地,可包含环氧树脂、酯树脂、氨基甲酸酯树脂和丙烯酸树脂中的一种以上。
固化剂可包含三聚氰胺固化剂、氨基甲酸酯固化剂、脂肪族多胺固化剂、改性脂肪族多胺固化剂、芳香族多胺固化剂和有机酸酐固化剂中的一种以上。
涂覆上表面粘合组合物后,使其固化,以形成上表面粘合层20。该步骤可在100至300℃的温度范围下实施,以使粘合涂层组合物固化。固化前后的上表面粘合组合物中的成分特征(羟基当量,重均分子量)实际上没有变化。
将下表面粘合组合物涂覆在电工钢板10下表面上,以形成下表面粘合层30。前述的形成上表面粘合层20的步骤和形成下表面粘合层30的步骤可以不分先后顺序。也就是说,可以先形成上表面粘合层20后,再形成下表面粘合层30,也可以先形成下表面粘合层30后,再形成上表面粘合层20。也可以同时形成上表面粘合层20和下表面粘合层30。
下表面粘合组合物包含羟基当量为15至20mgKOH/g的树脂。如果树脂包含适量的羟基,则电工钢板10层叠成层叠体100时,可以提高与上表面粘合层20的粘合力。同时,对于下表面粘合层30,可以防止生产时生产线的刮痕形缺陷。生产电工钢板时,输送电工钢板的滚轮与下表面接触。此时,如果下表面粘合组合物的羟基当量过低,则可能会产生多个刮痕形缺陷。
下表面粘合组合物可包含重均分子量为1000至10000的树脂。当包含分子量适当的树脂时,可以提高与上表面粘合层20的粘合力。如果重均分子量过低,则与上表面粘合层20的粘合力可能会降低。
如果重均分子量过高,则可能会产生多个刮痕形缺陷。更具体地,下表面粘合组合物可包含重均分子量为1500至5000的树脂。更具体地,下表面粘合组合物可包含重均分子量为2000至3000的树脂。
相对于固形物100重量%,下表面粘合组合物还可包含5至10重量%的固化剂。当固化剂含量过多时,与上表面粘合层20的粘合力可能会降低。当固化剂含量过少时,可能会产生多个刮痕形缺陷。固化剂之外的余量可以是树脂。更具体地,固化剂可包含5至8重量%。除了固形物之外,下表面粘合组合物还可包含溶剂。溶剂可以使用涂层组合物中使用的一般溶剂,省略具体的描述。例如,溶剂可包含水和有机溶剂中的一种以上。
树脂的种类不受特别限制。例如,树脂可包含环氧树脂、硅氧烷树脂、丙烯酸树脂、酚醛树脂、苯乙烯树脂、乙烯基树脂、乙烯树脂、酯树脂和氨基甲酸酯树脂中的一种以上。更具体地,可包含环氧树脂、酯树脂、氨基甲酸酯树脂和丙烯酸树脂中的一种以上。可以与前述的上表面粘合组合物的树脂相同或不同。
固化剂可包含三聚氰胺固化剂、氨基甲酸酯固化剂、脂肪族多胺固化剂、改性脂肪族多胺固化剂、芳香族多胺固化剂和有机酸酐固化剂中的一种以上。可以与前述的上表面粘合组合物的固化剂相同或不同。
涂覆下表面粘合组合物后,使其固化,以形成下表面粘合层30。该步骤可在100至300℃的温度范围下实施,以使粘合涂层组合物固化。固化前后的下表面粘合组合物中的成分特征(羟基当量,重均分子量)实际上没有变化。
图2中示意性地示出根据本发明的一个实施例的电工钢板层叠体的截面。参照图2描述根据本发明的一个实施例的电工钢板层叠体的结构。图2的电工钢板层叠体只是用于例示本发明,本发明不限于此。因此,可以对电工钢板层叠体的结构进行各种变形。
如图2所示,根据本发明的一个实施例的电工钢板层叠体100,其层叠有多个电工钢板10,上表面粘合层20和下表面粘合层30依序夹置在电工钢板10之间。
电工钢板10、上表面粘合层20和下表面粘合层30与前述的电工钢板10相同,因此不再赘述。
制造电工钢板层叠体100的方法包含将形成有上表面粘合层20和下表面粘合层30的多个电工钢板10层叠后进行热粘合的步骤。通过热粘合的步骤,上表面粘合层20和下表面粘合层30内的树脂成分会热粘合,并形成热粘合层。
热粘合的步骤可以在100至300℃的温度、0.05至5.0Mpa的压力和0.1至120分钟的加压条件下进行热粘合。可以独立地满足所述每个条件,也可以同时满足2个以上的条件。如此,通过调节热粘合步骤中的温度、压力、时间条件,可以紧密地热粘合,使得无取向电工钢板之间没有空隙或气孔。
热粘合的步骤包含升温步骤和热粘合步骤,升温步骤的升温速度可为10℃/分钟至1000℃/分钟。
如此,根据本发明的一个实施例的电工钢板层叠体,不仅改善电工钢板本身的磁性(具体地,铁损、磁通密度等),而且粘合涂层的粘合性优异。
在下文中,将通过实施例更详细地描述本发明。然而,下述实施例只是本发明的示例而已,本发明不限于本文所述的实施例。
实施例
作为试样准备含有3.15重量%的硅(Si)且板厚为0.35mm的退火处理过的无取向电工钢板(50×50mm)。用刮棒涂覆机(Bar Coater)将由下表1所示的固形物组成的粘合组合物以一定的厚度涂覆在准备的各试样的上部和下部,并以板温为基准在150至250℃下固化20秒,然后在空气中慢慢冷却,以形成厚度为约3.0μm的粘合涂层。
将涂覆有粘合涂层的电工钢板层叠成高度为20mm,然后以0.1MPa的力量施加压力,在120℃下热粘合10分钟。对于不同条件下热粘合的电工钢板的粘合力,通过剪切面拉伸法测定粘合力。
粘合力:将采用剪切法(Shear Strength)制作的试样以一定力量固定在上/下夹具(JIG),然后使用以恒定速度拉拽并测定层叠样品的拉力的装置进行测定。此时,对于剪切法,所测定的值是测定层叠样品的界面中具有最小粘合力的界面脱落的点而得到的值。
表面硬度:作为测定涂层的表面硬度的方法采用铅笔硬度测定法(PencilHardness)。用标准铅笔(三菱铅笔,8B-10H)在500g的荷重下以45度角划线后,肉眼确认涂层表面上有无压痕。
【表1】
【表2】
如表1和表2所示,实施例1和实施例2具有优异的表面特性和粘合力。
另一方面,与比较例1一样,上表面和下表面的羟基当量、分子量、固化剂含量相同以及硬度较软时,在热粘合之后,虽然剪切粘合力优异,但是下表面的涂层的表面硬度差,因此产生多个刮痕形缺陷。
与比较例2一样,上表面和下表面的羟基当量、分子量、固化剂含量相同以及硬度较硬时,虽然没有产生刮痕形缺陷,但是热粘合之后,剪切粘合力差。
与比较例3一样,上表面和下表面的粘合层性质相反时,在热粘合之后,虽然剪切粘合力优异,但是下表面的涂层的表面硬度差,因此产生多个刮痕形缺陷。
与比较例4一样,下表面粘合层的硬度过高时,虽然没有产生刮痕形缺陷,但是热粘合之后,剪切粘合力差。
与比较例5一样,上表面粘合层的硬度过低时,由于生产产品后卷取成卷板,将会产生上/下表面粘合层粘在一起的缺陷。
本发明能以各种不同方式实施,并不局限于上述的实施例,本发明所属技术领域的普通技术人员可以理解在不改变本发明的技术思想或必要特征的情况下能够通过其他具体方式实施本发明。因此,应该理解上述的实施例在所有方面都是示例性的,并不是限制性的。
附图标记说明
10:电工钢板
20:上表面粘合层
30:下表面粘合层
40:电工钢板层叠体

Claims (13)

1.一种电工钢板,其特征在于,
所述电工钢板包含:
位于电工钢板上表面的上表面粘合层;
位于电工钢板下表面的下表面粘合层,
所述上表面粘合层的铅笔硬度为B至F,
所述下表面粘合层的铅笔硬度为H至4H。
2.根据权利要求1所述的电工钢板,其特征在于,
所述上表面粘合层包含重均分子量为15000至50000的树脂,
所述下表面粘合层包含重均分子量为1000至10000的树脂。
3.根据权利要求1所述的电工钢板,其特征在于,
所述上表面粘合层还包含3重量%以下的固化剂,
所述下表面粘合层还包含5至10重量%的固化剂。
4.根据权利要求1所述的电工钢板,其特征在于,
所述上表面粘合层包含羟基当量为1至10mgKOH/g的树脂,
所述下表面粘合层包含羟基当量为15至20mgKOH/g的树脂。
5.根据权利要求1所述的电工钢板,其特征在于,
所述上表面粘合层和所述下表面粘合层中包含的树脂各自包含环氧树脂、硅氧烷树脂、丙烯酸树脂、酚醛树脂、乙烯基树脂和酯树脂中的一种以上。
6.根据权利要求3所述的电工钢板,其特征在于,
所述上表面粘合层和所述下表面粘合层中包含的固化剂各自包含三聚氰胺固化剂、氨基甲酸酯固化剂、脂肪族多胺固化剂、改性脂肪族多胺固化剂、芳香族多胺固化剂和有机酸酐固化剂中的一种以上。
7.一种电工钢板的制造方法,其特征在于,
所述制造方法包含:
将上表面粘合组合物涂覆在电工钢板上表面上以形成上表面粘合层的步骤;以及
将下表面粘合组合物涂覆在所述电工钢板下表面上以形成下表面粘合层的步骤,
所述上表面粘合组合物包含羟基当量为1至10mgKOH/g的树脂,
所述下表面粘合组合物包含羟基当量为15至20mgKOH/g的树脂,
所述上表面粘合层的铅笔硬度为B至F,
所述下表面粘合层的铅笔硬度为H至4H。
8.根据权利要求7所述的电工钢板的制造方法,其特征在于,
所述上表面粘合组合物包含重均分子量为15000至50000的树脂,
所述下表面粘合组合物包含重均分子量为1000至10000的树脂。
9.根据权利要求7所述的电工钢板的制造方法,其特征在于,
相对于固形物100重量%,所述上表面粘合组合物还包含3重量%以下的固化剂,
相对于固形物100重量%,所述下表面粘合组合物还包含5至10重量%的固化剂。
10.一种电工钢板层叠体,其特征在于,
所述层叠体层叠有多个电工钢板,
所述电工钢板之间依序夹置上表面粘合层和下表面粘合层,
所述上表面粘合层的铅笔硬度为B至F,
所述下表面粘合层的铅笔硬度为H至4H。
11.根据权利要求10所述的电工钢板层叠体,其特征在于,
所述上表面粘合层包含重均分子量为15000至50000的树脂,
所述下表面粘合层包含重均分子量为1000至10000的树脂。
12.根据权利要求10所述的电工钢板层叠体,其特征在于,
所述上表面粘合层还包含3重量%以下的固化剂,
所述下表面粘合层还包含5至10重量%的固化剂。
13.根据权利要求10所述的电工钢板层叠体,其特征在于,
所述上表面粘合层包含羟基当量为1至10mgKOH/g的树脂,
所述下表面粘合层包含羟基当量为15至20mgKOH/g的树脂。
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