CN106947404A - 一种电热膜用耐高温预涂封装复合膜 - Google Patents
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Abstract
本发明公开了一种电热膜用耐高温预涂封装膜,包括:底材层、中间层和热塑性树脂层;所述底材层为双向拉伸聚酯层,具有电绝缘性能,电气强度为78V/um,纵横向热收缩率小于1%;所述的中间层,设置在所述底材层的表面上,由聚氨酯、聚酯或丙烯酸酯、固化剂、稀释剂形成,所述固化剂为异氰酸酯类;所述中间层的涂布干重为0.2‑3g/m2;所述热塑性树脂层设置在所述中间层的另一表面上,热塑性树脂层脆化温度<‑70℃,所述热塑性树脂层为≥2层的叠层结构。本发明产品可耐70‑140度高温烘烤,尺寸稳定性好,收缩率小,且可耐高湿环境,借助改性热塑性树脂优异的粘接特性,对金属板、塑料片材等均有很好的粘接效果。
Description
技术领域
本发明涉及一种用于对建筑领域电热膜进行封装的复合膜材料,特别涉及一种电热膜用耐高温烘烤复合膜。
背景技术
电热膜分为高温、低温电热膜。高温电热膜一般用于电子电器、军事等。低温电热膜是一种通电后能发热的半透明聚酯薄膜,由可导电的特制油墨、金属载流条经加工、热压在绝缘聚酯薄膜间制成。工作时以电热膜为发热体,将热量以辐射的形式送入空间,使人体和物体首先得到温暖,其综合效果优于传统的对流供暖方式。
电热膜制热原理是产品在电场的作用下,发热体中的碳分子团产生“布朗运动”,碳分子之间发生剧烈的摩擦和撞击,产生的热能以远红外辐射和对流的形式对外传递,其电能与热能的转换率高达98%以上。碳分子的作用使***表面迅速升温。将电热膜暖采暖***安装在墙(地)面上,热能就会源源不断地均匀传递到房间的每一个角落。
电热膜性能需满足:(1)耐高压,承受高达3750v以上的测试电压,而无破损。(2)抗老化,电热膜的材料均为特制专用材质,具有良好的特性,抗老化、不变质、性能稳定、使用年限与建筑物同龄。(3)耐潮湿,电热膜整体是防水的,经浸水48小时耐3750V以上高压测试,其工作性能正常,无漏电现象。(4)韧度高,根据测试,电热膜的抗拉力需达20公斤。(5)收缩小,在2100个小时的老化测试中,收缩率小于2%。
低温辐射电热膜供暖***可用于各种类型的建筑物中。作为一种优良的供暖***,不仅适用于北方,更适用于冬季无取暖设施的大部分南方地区。可广泛应用于别墅、商品房、经济适用房、农村自盖房、等民用住宅;学校、医院、商超等公共建筑,以及农村城镇化建设、道路融雪等领域,电热膜具有广阔的用前景。
但是电热膜不能直接用于地面辐射供热,需要外加封装膜或管套,才能用于地面采暖,保证使用效果和寿命。因此,根据电热膜产品的特性,其封装复合膜需能耐70-100度高温烘烤及高压测试,连续运行26000小时,性能和尺寸不变。且耐潮湿、抗老化,在热合过程中,使膜片之间充分聚合,无气泡、不起层,保证发热体与载流条、复合封装膜的紧密结合。
现有的技术无法满足以上要求。
发明内容
本发明旨在至少在一定程度上解决现有技术的问题。为此,本发明的一个目的在于提出一种具有能耐70-100度高温烘烤及高压测试,连续运行上万小时,性能和尺寸不变。耐潮湿、抗老化,且在热合过程中,使膜片与电热膜之间充分聚合,无气泡、不起层,保证发热体与载流条、复合封装膜的紧密结合的封装膜产品。
本发明的技术方案为:
一种电热膜用耐高温预涂封装膜,包括:底材层、中间层和热塑性树脂层;所述底材层为双向拉伸聚酯层,具有电绝缘性能,电气强度为78V/um,纵横向热收缩率小于1%;所述的中间层,设置在所述底材层的表面上,由聚氨酯、聚酯或丙烯酸酯、固化剂、稀释剂形成,所述固化剂为异氰酸酯类;所述中间层的涂布干重为0.2-3g/m2;所述热塑性树脂层设置在所述中间层的另一表面上,热塑性树脂层脆化温度<-70℃,所述热塑性树脂层为≥2层的叠层结构。
所述中间层的聚氨酯、聚酯或丙烯酸酯的重量百分比为20%-60%,所述固化剂的重量百分比小于10%,其余成分为稀释剂;所述的稀释剂为有机溶剂;所述固化剂为异氰酸酯类,所述中间层的涂布干重为0.2-3g/m2。
优选的,所述热塑性树脂层为马来酸酐接枝改性聚烯烃,或乙烯-醋酸乙烯共聚物、或烯烃共聚物的一种或几种。
优选的,所述的稀释剂包括但不限于乙酸乙酯、丁酮。优选的,所述热塑性树脂层为2层的叠层结构,包括树脂层a和树脂层b,树脂层b设置于中间层及树脂层a之间,树脂层a置于最外侧。
优选的,所述树脂层b熔点为85-125℃,熔融指数MI在15.0-40.0之间;所述树脂层a熔点为120-140℃,熔融指数MI在3.0-20.0之间。
所述底材层的厚度为50-250μm,中间层的厚度为0.5-3μm,热塑性树脂层的厚度为30-150μm。
优选的,所述底材层的厚度为100-150μm;中间层的厚度为2-3μm;热塑性树脂层的厚度为50-100μm。
所述的电热膜用耐高温预涂封装膜的制备方法,其特征在于:步骤为:
1)在底材层的表面上涂布由聚氨酯、聚酯或丙烯酸酯和稀释剂、固化剂形成的混合液并烘干,以在所述底材层的表面上形成中间层;
2)在所述中间层上共挤涂覆乙烯-醋酸乙烯共聚物,或烯烃共聚物,或马来酸酐接枝改性聚烯烃共聚物以形成热塑性树脂层b;
3)在所述热塑性树脂层b上共挤涂覆马来酸酐接枝改性聚烯烃共聚物以形成热塑性树脂层a;
4)对所述热塑性树脂层a表面做电晕处理,最后收卷得到耐高温预涂封装膜。
所述步骤1)包括:对所述底材层的内表面进行电晕处理,使所述底材层的表面达因值达到48以上;在经过电晕处理的所述底材层表面上涂布由聚氨酯或丙烯酸酯和固化剂形成的混合液并烘干,烘干温度为65-95℃;
所述步骤3)和步骤4)中,还需要对树脂层b进行臭氧处理,臭氧的浓度为40%,功率800W,气体流量为3.5SCXFM。
本发明的有益效果为:
本发明涉及的电热膜用耐高温预涂封装膜具有超高绝缘特性,另外,中间层作为基材层和树脂层的连结层,可极大地提高两层之间的附着力,且经过熟化后具有一定的耐高温特性。
本发明的树脂层采用叠层设计,高熔点低流动性改性聚烯烃树脂层作为热封层与电热膜封装复合,可保证封装后的耐湿热性及耐形变特性,低熔点高流动性烯烃聚合物作为粘结底材层与改性聚烯烃树脂层的夹层,可以提高两层的粘附性,且热复合时快速熔融,高流动性的熔融分子间隙也能让复合时表面的空气快速排出,提高底材层与树脂热封层的复合强度。
所述树脂层脆化温度<-70℃,熔融指数等特性能良好地适应挤出复合机单螺杆挤出特性,在挤出熔融状态下具有非常好的成膜特性和流变性能,被设计在挤出复合工艺中提供优良的可加工性能,且适合高速挤出复合,缩颈小浪费少。
本发明通过2种或2种以上热塑性树脂的叠层设计来调整树脂物性,借用现有的挤出或共挤出复合生产设备即可成功生产出厚度均匀性好,加工性优良的高粘接力复合膜,产品可耐70-140度高温烘烤,尺寸稳定性好,收缩率小,且可耐高湿环境,借助改性热塑性树脂优异的粘接特性,对金属板、塑料片材等均有很好的粘接效果。
本发明涉及的耐高温电热膜用预涂封装膜只需对膜/膜进行加热加压即可实现产品的封装,全程无溶剂挥发,无化学残留,可实现保护环境、安全生产、安全使用。采用绝缘性能优异,电气强度达78V/um,击穿电压大于4.0kV特质的PET作为底材,采用2种或2种以上热塑树脂复配作为可适合挤出的热塑性树脂层,且树脂可耐高温高湿,耐老化形变,在长期使用过程中无气泡无起膜现象,保持持续的封装特性。这是一种新型电热膜封装技术产品。
附图说明
图1是本发明的结构示意图;
其中:1:底材层、2:中间层、3:热塑性树脂层、a:树脂层a、b:树脂层b。
具体实施方式
下面详细描述本发明的实施例,所述实施例的示例在附图中示出。下面通过参考附图描述的实施例是示例性的,旨在用于解释本发明,而不能理解为对本发明的限制。
此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中,“多个”的含义是两个或两个以上,除非另有明确具体的限定。
在本发明中,除非另有明确的规定和限定,第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触,也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且,第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方,或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正上方和斜上方,或仅仅表示第一特征水平高度小于第二特征。
实施例1:一种电热膜用耐高温预涂封装膜
如图1所示,一种电热膜用耐高温预涂封装膜,包括底材层1、中间层2和热塑性树脂层3;其中,底材层1为双向拉伸聚酯(BOPET)层;底材层1的厚度为50μm;中间层2设置在底材层1表面且由聚氨酯、固化剂、稀释剂形成,所述固化剂为异氰酸酯类,稀释剂为乙酸乙酯;
中间层2聚氨酯含量30%,固化剂5%,其余为乙酸乙酯稀释剂,涂布干重为0.2g/m2,厚度为0.5μm;
热塑性树脂层3的树脂层b设置在中间层2上且为乙烯-醋酸乙烯共聚物,树脂层a设置在树脂层b上,且为马来酸酐接枝改性聚丙烯,所述所述树脂层b熔点在85-125℃之间,所述树脂层中树脂层a熔点为120-140℃之间,树脂层脆化温度<-70℃,热塑性树脂层3的厚度为30μm;a、b两层厚度比例2:8;
由此,中间层2作为基材层和树脂层的连结层,可极大地提高两层之间的附着力。改性热塑性树脂层3不仅能够增强复合膜与被覆板之间的粘结力,而且可以满足后期使用时耐70-100度高温的要求,且耐老化、高湿性能优良,复合膜复合强度高,与电热膜热复合时不会发生脱膜起泡的情况。
实施例2
如图1所示,一种电热膜用耐高温预涂封装膜,包括底材层1、中间层2和热塑性树脂层3;其中,底材层1为双向拉伸聚酯(BOPET)层;底材层1的厚度为100μm;中间层2设置在底材层1表面且由丙烯酸酯、固化剂、稀释剂形成,所述固化剂为异氰酸酯类,稀释剂为丁酮类;
中间层2聚氨酯含量30%,固化剂5%,其余为乙酸乙酯稀释剂,涂布干重0.2g/m2,厚度为0.5μm;
热塑性树脂层3的树脂层b设置在中间层2上且为乙烯-醋酸乙烯共聚物或烯烃共聚物,树脂层a设置在树脂层b上,且为马来酸酐接枝改性聚丙烯,所述所述树脂层b熔点在85-125℃之间,所述树脂层中树脂层a熔点为120-140℃之间,树脂层脆化温度<-70℃,热塑性树脂层3的厚度为100μm;a、b两层厚度比例3:7;
由此,中间层2作为基材层和树脂层的连结层,可极大地提高两层之间的附着力。改性热塑性树脂层3不仅能够增强复合膜与被覆板之间的粘结力,而且可以满足后期使用时耐70-100度高温的要求,且耐老化、高湿性能优良,复合膜复合强度高,与电热膜热复合时不会发生脱膜起泡的情况。
实施例3:一种电热膜用耐高温预涂封装膜
一种电热膜用耐高温预涂封装膜,包括:底材层、中间层和热塑性树脂层,所述底材层为双向拉伸聚酯层,具有电绝缘性能,电气强度达到78V/um,纵横向热收缩率小于1%,厚度为250μm;
所述的中间层,设置在所述底材层的表面上,由聚氨酯、固化剂、稀释剂形成,所述固化剂为异氰酸酯类,且所述中间层的涂布干重为3g/m2,厚度为3μm;
所述热塑性树脂层设置在所述中间层的另一表面上,热塑性树脂层脆化温度<-70℃;
所述热塑性树脂层为含有马来酸酐接枝改性聚烯烃;
所述热塑性树脂层为3层的叠层构造,总厚度为150μm,a、b、b层的厚度比例为2:1:1。
所述的一种预涂封装膜的制备方法,包括以下步骤:
1)在底材层的表面上涂布由聚氨酯或丙烯酸酯和稀释剂、固化剂形成的混合液并烘干,以在所述底材层的表面上形成中间层;
2)在所述中间层上共挤涂覆乙烯-醋酸乙烯共聚物,或烯烃共聚物,或马来酸酐接枝改性聚烯烃共聚物以形成热塑性树脂层b;
3)在所述热塑性树脂层b上共挤涂覆马来酸酐接枝改性聚烯烃共聚物以形成热塑性树脂层a;
4)对所述热塑性树脂层a表面做电晕处理,最后收卷得到耐高温预涂封装膜。
所述步骤1)包括:
2-1)对所述底材层的内表面进行电晕处理,使所述底材层的表面达因值达到48以上;
2-2)在经过电晕处理的所述底材层表面上涂布由聚氨酯、聚酯或丙烯酸酯和固化剂形成的混合液并烘干,烘干温度为65-95℃。
所述步骤3)和步骤4)中,还需要对树脂层b进行臭氧处理,臭氧的浓度为40%,功率800W,气体流量为3.5SCXFM。
尽管上面已经示出和描述了本发明的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本发明的限制,本领域的普通技术人员在不脱离本发明的原理和宗旨的情况下在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。
Claims (10)
1.一种电热膜用耐高温预涂封装膜,其特征在于,包括:底材层、中间层和热塑性树脂层;所述底材层为双向拉伸聚酯层,具有电绝缘性能,电气强度为78V/um,纵横向热收缩率小于1%;所述的中间层,设置在所述底材层的表面上,由聚氨酯、聚酯或丙烯酸酯、固化剂、稀释剂形成,所述固化剂为异氰酸酯类;所述中间层的涂布干重为0.2-3g/m2;所述热塑性树脂层设置在所述中间层的另一表面上,热塑性树脂层脆化温度<-70℃,所述热塑性树脂层为≥2层的叠层结构。
2.根据权利要求1所述的预涂封装膜,其特征在于:所述中间层的聚氨酯、聚酯或丙烯酸酯的重量百分比为20%-60%,所述固化剂的重量百分比小于10%,其余成分为稀释剂;所述的稀释剂为有机溶剂;所述固化剂为异氰酸酯类,所述中间层的涂布干重为0.2-3g/m2。
3.根据权利要求1所述的预涂封装膜,其特征在于:所述热塑性树脂层为马来酸酐接枝改性聚烯烃,或乙烯-醋酸乙烯共聚物、或烯烃共聚物的一种或几种。
4.根据权利要求1所述的预涂封装膜,其特征在于:所述的稀释剂包括但不限于乙酸乙酯、丁酮。
5.根据权利要求1至3任一所述的预涂封装膜,其特征在于:所述热塑性树脂层为2层的叠层结构,包括树脂层a和树脂层b,树脂层b设置于中间层及树脂层a之间,树脂层a置于最外侧。
6.根据权利要求5所述的预涂封装膜,其特征在于:所述树脂层b熔点为85-125℃,熔融指数MI在15.0-40.0之间;所述树脂层a熔点为120-140℃,熔融指数MI在3.0-20.0之间。
7.根据权利要求5所述的预涂封装膜,其特征在于:所述底材层的厚度为50-250μm,中间层的厚度为0.5-3μm,热塑性树脂层的厚度为30-150μm。
8.根据权利要求8所述的预涂封装膜,其特征在于:所述底材层的厚度为100-150μm;中间层的厚度为2-3μm;热塑性树脂层的厚度为50-100μm。
9.根据权利要求7所述的电热膜用耐高温预涂封装膜的制备方法,其特征在于:步骤为:
1)在底材层的表面上涂布由聚氨酯、聚酯或丙烯酸酯和稀释剂、固化剂形成的混合液并烘干,以在所述底材层的表面上形成中间层;
2)在所述中间层上共挤涂覆乙烯-醋酸乙烯共聚物,或烯烃共聚物,或马来酸酐接枝改性聚烯烃共聚物以形成热塑性树脂层b;
3)在所述热塑性树脂层b上共挤涂覆马来酸酐接枝改性聚烯烃共聚物以形成热塑性树脂层a;
4)对所述热塑性树脂层a表面做电晕处理,最后收卷得到耐高温预涂封装膜。
10.根据权利要求9所述的电热膜用耐高温预涂封装膜的制备方法,其特征在于:
所述步骤1)包括:对所述底材层的内表面进行电晕处理,使所述底材层的表面达因值达到48以上;在经过电晕处理的所述底材层表面上涂布由聚氨酯或丙烯酸酯和固化剂形成的混合液并烘干,烘干温度为65-95℃;
所述步骤3)和步骤4)中,还需要对树脂层b进行臭氧处理,臭氧的浓度为40%,功率800W,气体流量为3.5SCXFM。
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