CN111775536A - 抗刮防污tpu保护膜的涂层固化工艺 - Google Patents
抗刮防污tpu保护膜的涂层固化工艺 Download PDFInfo
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Abstract
本发明公开了一种抗刮防污TPU保护膜的涂层固化工艺,包括以下步骤:1)准备TPU薄膜,该TPU薄膜上含有PET载体层;2)采用网纹辊将抗刮防污涂层浆料涂布到TPU薄膜不含PET载体层的一面上;3)对抗刮防污涂层进行高温烘干固化;4)对抗刮防污涂层进行熟化;5)在抗刮防污涂层的表面覆保护膜,本发明对现有涂层固化工艺进行优化改进,采用热固化涂层体系,减少对环境产生臭氧危害,本发明所获得的抗刮防污TPU保护膜具有较高的光泽度和优良的防污性能。
Description
技术领域
本发明涉及保护膜领域,尤其是涉及一种功能性TPU保护膜的涂层固化工艺。
背景技术
TPU是一种高分子弹性材料,被称为二十一世纪的新型环保材料。TPU的特殊分子结构决定了他具有优良的物理特性,如:高弹性、耐磨性、高强度、强硬度、易延展性 和优良的温度适应性;并且无毒性、防水、透气、耐油、耐水、耐霉菌。而且耐温性好,可在-60℃—200℃范围内长期保持弹性。因此TPU材料在越来越多的行业受到青睐,以TPU为基材的车身贴越来越多被应用在汽车行业内。
随着材料行业的不断发展,单纯的TPU结构已不足以满足广大的消费市场对于保护膜的功能需求。TPU薄膜具有一定的韧性,但是薄膜本身较为柔软,容易因强度较高的力导致刮痕,甚至刮伤。并且汽车的外表易受外界环境污染,难以保持长久洁净的状态,因此许多人为了让自己的爱车看起来干净美观,会频繁地对车身进行清洗,除油污油渍,然后对车身打蜡、封釉等。打蜡和封釉可以使车身光亮,不易污染,耐划伤,易清洗。但这些举措的保护期并不长久,如打蜡的周期为7~15天;封釉的周期为3~6个月;清洗的周期更短。另外,每进行一次这样的车身维护都会对车身表面带来一次损伤,如频繁地清洗擦拭会使车表面出现痕迹;车蜡中含有的碱性成份会使车身变乌;封釉前必须对车身抛光,一次抛光会使漆面变薄3~5微米。
专利号为2017108736271的发明专利公开了一种抗刮抗污TPU车身保护膜及其生产工艺, 包括基材层和设于基材层下部的胶层,所述基材层为TPU薄膜,TPU薄膜的上表面设有抗刮抗污涂层,该抗刮抗污涂层的组成为:主体树脂50~85份,引发剂或/和交联剂0.01~5份,填料5~50份,助剂0~20份,溶剂0~30份, 所述主体树脂为聚酯型聚氨酯和/或丙烯酸树脂的组合物, 所述引发剂为α-羟烷基苯酮类引发剂、α-胺烷基苯酮类引发剂或酰基磷氧化物类引发剂,所述交联剂为氮丙啶、有机硅交联剂、环氧硅烷偶联剂或多功能聚碳化二亚胺交联剂,该抗刮抗污TPU车身保护膜的生产工艺,包括以下步骤:1)将TPU膜进行高压电晕处理;2)通过网纹涂布、转移涂布、夹缝式挤压涂布中的任意一种方式在TPU膜的电晕处理面上涂布抗刮抗污涂层,涂布量为10~20g/m2,涂层的粘度控制在300~400cps;3)通过热风烘干、光固化中的任意一种方式或两者结合对抗刮抗污涂层进行固化,所述热风烘干的温度控制为80~105℃,所述光固化的光波长为340~370nm,该发明提供了一种抗刮抗污TPU车身保护膜的涂层配方及该车身保护膜的生产工艺,然而,采用这种生产工艺获得的TPU车身保护膜的表面涂层常常丧失抗污性能,表现为采用油墨笔在涂层上涂画,再用酒精擦拭,油墨笔迹难以擦拭干净,同时涂层的光泽度较低。
发明内容
针对现有生产工艺常产生的问题,本发明提供一种抗刮抗污TPU保护膜的涂层固化工艺,本发明的技术方案如下:
一种抗刮防污TPU保护膜的涂层固化工艺,包括以下步骤:
1)准备TPU薄膜,该TPU薄膜上含有PET载体层;
2)采用网纹辊将抗刮防污涂层浆料涂布到TPU薄膜不含PET载体层的一面上;
3)对抗刮防污涂层进行高温烘干固化;
4)对抗刮防污涂层进行熟化;
5)在抗刮防污涂层的表面覆保护膜。
上述步骤1)中,所述TPU薄膜的厚度为120-150μm,所述TPU薄膜为聚酯型TPU薄膜或脂肪族TPU薄膜。
上述步骤2)中,所述抗刮防污涂层为热固性涂层体系。
进一步的,所述抗刮防污涂层包含以下重量百分比的成份:主体树脂65-75%,交联剂20-30%,催化剂0.01-5%,余量为溶剂。
进一步的,所述主体树脂为聚氨酯、聚碳酸酯、聚己内酯、氟碳树脂中的一种或多种。
进一步的,所述聚氨酯是由多元醇和多异氰酸酯反应而来,所述多元醇选自聚酯多元醇、聚醚多元醇、聚碳酸酯多元醇、聚己内酯多元醇,所述多异氰酸酯包含两个及两个以上的异氰酸酯基团。
进一步的,所述多元醇选自氟碳改性聚酯多元醇、氟碳改性聚醚多元醇、氟碳改性聚碳酸酯多元醇、氟碳改性聚己内酯多元醇。
进一步的,所述交联剂为丙烯酸酯,甲基丙烯酸酯、烯丙基异氰酸酯中的一种或多种。
进一步的,所述交联剂为氟碳改性丙烯酸酯、氟碳改性甲基丙烯酸酯中的一种。
进一步的,所述催化剂为金属盐催化剂,所述金属盐催化剂为异氰酸或有机羧酸或盐酸或硫酸或膦酸与金属形成的金属盐催化剂,所述金属选自铂、镍、稀土金属中的一种或几种。
上述步骤3)中,所述高温烘干的温度为60-110℃,所述步骤3)获得的抗刮防污涂层的溶剂残余率≤30%,所述步骤3)获得的抗刮防污涂层的交联度≥60%,所述抗刮防污涂层的厚度为5-70μm。
上述步骤4)中,所述熟化的温度为35-45℃,所述熟化的时间≥72h。
上述步骤5)中,所述保护膜为PET保护膜或PP保护膜或PVC保护膜或PE保护膜,所述保护膜的厚度为40-100μm,所述保护膜通过有机硅胶水或低粘压敏胶水贴附在抗刮防污涂层的表面,用以保护抗刮防污涂层。
本发明通过对抗刮防污TPU保护膜的生产工艺进行优化,形成一种涂层固化工艺,使用该涂层固化工艺制造的抗刮防污TPU保护膜具有如下优势:
1)热固化涂层体系,相比于原来的紫外光固化体系,不对生产环境产生臭氧,不存在光辐射伤害;
2)首先对涂层进行高温烘干,控制涂层的溶剂残余率≤30%,获得的抗刮防污涂层的交联度≥60%,再进行熟化,使抗刮防污涂层进一步交联固化,然后再覆PET保护膜;原涂层固化工艺中,涂层经高温烘干固化之后直接覆PET保护膜,再进行熟化,未对涂层的交联程度和溶剂残余率进行控制,PET保护膜的有机硅胶水层或低粘压敏胶层影响功能性涂层的表面物理性能,使得功能性涂层失去光泽性和良好的防污性能;而本发明能提高涂层的光泽度,涂层中的氟碳官能团有效地分布在交联涂层的表面,形成良好的耐污性;
3)抗刮防污TPU保护膜的透明度≥95%,光泽度≥90%,采用油性笔在TPU保护膜的表面涂写并保留油墨痕迹5min,再用酒精棉布擦拭直至油墨痕迹面积不再减少,颜色不再变浅,通过遮盖率仪对TPU保护膜本身,涂写区域,以及擦拭后的涂写区域的遮盖率进行检测和对比,本发明获得的抗刮防污TPU保护膜具有良好的抗污性能;采用200目砂纸,在200g连续载荷下进行固定数量的摩擦,采用光泽度仪对TPU保护膜本身,摩擦区域,24h后的摩擦区域的表面光泽度进行检测和对比,用以评价涂层的抗刮性能,本发明获得的抗刮抗污TPU保护膜具有较高的光泽度以及良好的抗刮性能。
具体实施方式
下面结合具体实施方式对本发明做进一步的说明与解释。
具体实施方式一
一种抗刮防污TPU保护膜的涂层固化工艺,包括以下步骤:
1)准备TPU薄膜,该TPU薄膜上含有PET载体层;
2)采用网纹辊将抗刮防污涂层浆料涂布到TPU薄膜不含PET载体层的一面上;
3)对抗刮防污涂层进行高温烘干固化;
4)对抗刮防污涂层进行熟化;
5)在抗刮防污涂层的表面覆保护膜。
上述步骤1)中,所述TPU薄膜的厚度为120μm,所述TPU薄膜为脂肪族TPU薄膜。
上述步骤2)中,所述抗刮防污涂层为热固性涂层体系。
进一步的,所述抗刮防污涂层包含以下重量百分比的成份:主体树脂70%,交联剂25%,催化剂2%,余量为溶剂。
进一步的,所述主体树脂为聚氨酯,所述聚氨酯是由多元醇和多异氰酸酯反应而来,所述多元醇为聚酯多元醇,所述多异氰酸酯包含三个异氰酸酯基团,所述交联剂为氟碳改性甲基丙烯酸酯,
进一步的,所述催化剂为金属盐催化剂,所述金属盐催化剂为异氰酸与金属形成的金属盐催化剂,所述金属为铂和镍。
上述步骤3)中,所述高温烘干的温度为60-110℃,所述步骤3)获得的抗刮防污涂层的溶剂残余率为20-25%,所述步骤3)获得的抗刮防污涂层的交联度为75%,所述抗刮防污涂层的厚度为10μm。
上述步骤4)中,所述熟化的温度为40℃,所述熟化的时间为75h。
上述步骤5)中,所述保护膜为PET保护膜,所述PET保护膜通过有机硅胶水贴附在抗刮防污涂层的表面,所述PET保护膜的厚度为40μm。
采用油性笔在所述抗刮防污TPU保护膜的表面涂写,保留油墨痕迹5min,用65-75%酒精棉布擦拭油墨痕迹直至油墨痕迹面积不再减少,颜色不再变浅,再用遮盖率仪对涂写区域的遮盖性进行检测,同时对未涂写区域的遮盖性进行检测作为对比。
取先覆PET保护膜再熟化的抗刮防污TPU保护膜,按照上述检测方法,对保护膜的防污性能进行评价。
对比数据如下:
先覆保护膜再熟化 | 本发明 | |
遮盖率(初始值) | 2% | 2% |
遮盖率(酒精擦拭后) | 70% | 5% |
从上表中的数值来看,本发明获得的抗刮防污TPU保护膜首先具有较好的透明度,其次,保护膜的表面易清洁,对比原来的涂层固化工艺获得的TPU保护膜,本发明具有更好的防污性能。
采用200目砂纸,在200g连续载荷下进行固定次数的摩擦,采用光泽度仪对摩擦区域的光泽度进行检测,放置24h后再对摩擦区域的光泽度进行检测,同时,对未摩擦区域的光泽度进行检测,作为对比。
取先覆PET保护膜再熟化的抗刮防污TPU保护膜,按照上述检测方法,对保护膜的表面光泽度进行评价。
取无任何功能性涂层的TPU原膜作为空白样,按照上述检测方法,对其表面光泽度进行评价。
对比数据如下:
先覆保护膜再熟化 | 本发明 | 空白杨 | |
光泽度(初始值) | 88% | 94% | 93% |
光泽度(摩擦结束) | 62% | 65% | 58% |
光泽度(24h后) | 66% | 72% | 60% |
从上表中的数据来看,对比原来的涂层固化工艺所获得的TPU保护膜,本发明所获得的TPU保护膜的表面具有更高的光泽度,从摩擦结束时的光泽度以及24h后的光泽度来看,本发明获的TPU保护膜耐刮伤,划痕易恢复。
具体实施方式二
一种抗刮防污TPU保护膜的涂层固化工艺,包括以下步骤:
1)准备TPU薄膜,该TPU薄膜上含有PET载体层;
2)采用网纹辊将抗刮防污涂层浆料涂布到TPU薄膜不含PET载体层的一面上;
3)对抗刮防污涂层进行高温烘干固化;
4)对抗刮防污涂层进行熟化;
5)在抗刮防污涂层的表面覆保护膜。
上述步骤1)中,所述TPU薄膜的厚度为150μm,所述TPU薄膜为聚酯型TPU薄膜。
上述步骤2)中,所述抗刮防污涂层为热固性涂层体系。
进一步的,所述抗刮防污涂层包含以下重量百分比的成份:主体树脂75%,交联剂20%,催化剂0.01-5%,余量为溶剂。
进一步的,所述主体树脂为聚氨酯和氟碳树脂。
进一步的,所述聚氨酯是由多元醇和多异氰酸酯反应而来,所述多元醇为聚己内酯多元醇,所述多异氰酸酯包含两个异氰酸酯基团。
进一步的,所述交联剂为丙烯酸酯和甲基丙烯酸酯。
进一步的,所述催化剂为金属盐催化剂,所述金属盐催化剂为盐酸与金属形成的金属盐催化剂,所述金属为稀土金属镧。
上述步骤3)中,所述高温烘干的温度为60-110℃,所述步骤3)获得的抗刮防污涂层的溶剂残余率为30%,所述步骤3)获得的抗刮防污涂层的交联度为60%,所述抗刮防污涂层的厚度为20μm。
上述步骤4)中,所述熟化的温度为35℃,所述熟化的时间为76h。
上述步骤5)中,所述保护膜为PP保护膜,所述PP保护膜通过低粘压敏胶水贴附在抗刮防污涂层的表面,所述PP保护膜的厚度为80μm。
采用油性笔在所述抗刮防污TPU保护膜的表面涂写,保留油墨痕迹5min,用65-75%酒精棉布擦拭油墨痕迹直至油墨痕迹面积不再减少,颜色不再变浅,再用遮盖率仪对涂写,区域的遮盖性进行检测,同时对未涂写区域的遮盖性进行检测作为对比。
取先覆PET保护膜再熟化的抗刮防污TPU保护膜,按照上述检测方法,对保护膜的防污性能进行评价。
对比数据如下:
先覆保护膜再熟化 | 本发明 | |
遮盖率(初始值) | 2% | 2% |
遮盖率(酒精擦拭后) | 70% | 4% |
从上表中的数值来看,本发明获得的抗刮防污TPU保护膜首先具有较好的透明度,其次,保护膜的表面易清洁,对比原来的涂层固化工艺获得的TPU保护膜,本发明具有更好的防污性能。
采用200目砂纸,在200g连续载荷下进行固定次数的摩擦,采用光泽度仪对摩擦区域的光泽度进行检测,放置24h后再对摩擦区域的光泽度进行检测,同时,对未摩擦区域的光泽度进行检测,作为对比。
取先覆PET保护膜再熟化的抗刮防污TPU保护膜,按照上述检测方法,对保护膜的表面光泽度进行评价。
取无任何功能性涂层的TPU原膜作为空白样,按照上述检测方法,对其表面光泽度进行评价。
对比数据如下:
先覆保护膜再熟化 | 本发明 | 空白杨 | |
光泽度(初始值) | 88% | 92% | 93% |
光泽度(摩擦结束) | 62% | 65% | 58% |
光泽度(24h后) | 66% | 70% | 60% |
从上表中的数据来看,对比原来的涂层固化工艺所获得的TPU保护膜,本发明所获得的TPU保护膜的表面具有更高的光泽度,从摩擦结束时的光泽度以及24h后的光泽度来看,本发明获的TPU保护膜耐刮伤,划痕易恢复。
Claims (4)
1.一种抗刮防污TPU保护膜的涂层固化工艺,其特征在于:包括以下步骤:
1)准备TPU薄膜,该TPU薄膜覆有PET载体层;
2)采用网纹辊将抗刮防污涂层浆料涂布到TPU薄膜不含PET载体层的一面上;
3)对抗刮防污涂层进行高温烘干固化;
4)对抗刮防污涂层进行熟化;
5)在抗刮防污涂层的表面覆保护膜;
上述步骤3)中,所述高温烘干的温度为60-110℃,所述步骤3)获得的抗刮防污涂层的溶剂残余率≤30%,所述步骤3)获得的抗刮防污涂层的交联度≥60%,所述抗刮防污涂层的厚度为5-70μm。
2.根据权利要求1所述的一种抗刮防污TPU保护膜的涂层固化工艺,其特征在于:所述抗刮防污涂层为热固性涂层体系,所述热固性涂层体系包含以下重量百分比的成份:主体树脂65-75%,交联剂20-30%,催化剂0.01-5%,余量为溶剂。
3.根据权利要求1所述的一种抗刮防污TPU保护膜的涂层固化工艺,其特征在于:所述熟化的温度为35-45℃。
4.根据权利要求1所述的一种抗刮防污TPU保护膜的涂层固化工艺,其特征在于:所述熟化的时间≥72h。
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