CN111574781A - 高耐候聚氯乙烯阻光发泡板及其制备方法 - Google Patents
高耐候聚氯乙烯阻光发泡板及其制备方法 Download PDFInfo
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Abstract
本发明涉及聚氯乙烯发泡板材技术领域,具体涉及一种高耐候聚氯乙烯阻光发泡板及其制备方法。所述的高耐候聚氯乙烯阻光发泡板,由以下重量份数的原料制成:PVC树脂粉150份,填充剂10‑25份,ACR改性剂5‑10份,发泡调节剂10‑20份,复合发泡剂0.1‑5份,环保稳定剂3‑7份,增塑剂0.2‑0.8份,润滑剂1‑4份,阻光改性剂15‑30份,偶联剂0.1‑2份,颜料0.1‑3份,回收料50份。本发明的高耐候聚氯乙烯阻光发泡板,不仅具有优异的阻光性能,还具有良好的耐候性、耐腐蚀性和耐弯折性,同时保证了聚氯乙烯发泡板低密度、高硬度的优点,安装使用方便,可以取代传统灯箱侧面板的包覆材料;本发明还提供其制备方法。
Description
技术领域
本发明涉及聚氯乙烯发泡板材技术领域,具体涉及一种高耐候聚氯乙烯阻光发泡板及其制备方法。
背景技术
随着商业经济的发展,广告业也在翻天覆地的变化,新型的亚克力广告材料及其制作的发光灯箱及发光字受到人们的热捧,亚克力材料在制作发光广告灯箱或发光字时一般是直接用亚克力板材立体雕刻而成,配合以发光灯具使其具有发光效果,为了提高所刻字体形状发光后的清晰度和发光效果,一般在灯箱或字体的侧面用其他不透光材料予以封闭包覆形成闭合灯箱侧面板,传统的侧面板材料有铁片、铝片、不锈钢片等金属材料,这些存在着材料造价高、制作工艺繁琐、制作周期长、使用寿命短、色泽单一、易被腐蚀和被氧化腐蚀后易对亚克力灯箱造成污染等问题。
聚氯乙烯发泡板具有硬质、低密度、耐水性好的特点,被广泛应用于广告材料制作。专利CN2018103484601中公开了一种用于广告展示器材的PVC发泡板材,包括以下重量份的原料:PVC树脂60~80份、氯丁橡胶8~14份、聚氯乙烯5~15份、酚醛树脂7~12份、聚乳酸3~9份、聚己内酯2~7份、改性纳米碳酸钙6~12份、PE蜡1~2份、硬脂酸2~3份、纳米三氧化二铝2~4份、聚酯纤维1~3份、亚麻纤维2~4份、稳定剂1~2份、发泡剂1~3份、稳泡剂0.5~0.9份。制备的PVC发泡板材比重轻、强度高,具备高耐水性、耐候性、耐摩擦性的特点,并且稳定性好,泡孔均匀,力学性能好。专利CN2010105509753中公开了一种硬质聚氯乙烯发泡板材,由下列重量份数的原料组成:聚氯乙烯100份;稳定剂3~5份;丙烯酸酯加工改性剂3~30份;抗冲改性剂0~10份;填料0~100份;黄发泡剂0~2份;白发泡剂0~4份;润滑剂0~4份;颜料0~2份。制备的聚氯乙烯发泡板材具有硬质、低密度的特点,标准尺寸板材密度≤600kg/m3,广泛应用于广告耗材及家居,装饰装修及家具制作。但是现有专利公开的聚氯乙烯发泡板材均其不具备阻光性能,其透光率较高,需要在其表面增加涂层或者阻光膜,才能作为灯箱侧面的包覆材料使用。
为了使高分子复合材料自身具有良好的阻光性能,可以在复合材料中加入阻光剂,常用的阻光剂有二氧化钛等高折光度材料。专利CN99121501X中公开了一种挤出的非对称固体表面复合材料,在高分子树脂中加入二氧化钛等遮光剂,使复合材料具有良好的阻光效果,但是遮光剂的加入会使复合材料的力学性能有所下降。专利CN2007101717064中公开了一种阻光材料,在高分子树脂中加入复合阻光剂和阻燃剂、增韧剂、耐热剂、填料、光稳定剂、抗氧剂、润滑剂等助剂,使其制备而成的浅色阻光材料能够在厚度仅为3mm时可达到十分有效的阻光效果,解决了浅色材料阻光效果不佳的问题,同时保证了复合材料的力学性能。
但是上述专利均是将阻光剂应用于高密度的高分子材料中,在聚氯乙烯发泡板材原料中加入阻光剂,不仅会影响聚氯乙烯发泡板材的力学性能和耐候性,还会影响聚氯乙烯发泡板材的发泡过程,使聚氯乙烯发泡板材的密度增大。
发明内容
为了解决以上技术问题,本发明提供一种高耐候聚氯乙烯阻光发泡板,不仅具有优异的阻光性能,还具有良好的耐候性、耐腐蚀性和耐弯折性,同时保证了聚氯乙烯发泡板低密度、高硬度的优点,安装使用方便,可以取代传统灯箱侧面板的包覆材料;本发明还提供其制备方法。
本发明所述的高耐候聚氯乙烯阻光发泡板,由以下重量份数的原料制成:
PVC树脂粉为平均聚合度650-1150的PVC树脂粉料。
填充剂为粒径0.1-1μm的轻质微细碳酸钙。将其按一定比例添加到配方体系中可以降低成本,提高稳定性、硬度和刚度,改进塑料的加工性能、提高其耐热性、改进塑料的散光性、抗擦伤性、平滑度和对缺口抗冲击强度的增韧效果及混炼过程中的粘流性等。
ACR改性剂为甲基丙烯酸甲酯与丙烯酸乙酯、丙烯腈聚合物的接枝共聚物,特性粘度为9-11η。ACR再加工过程中会形成以PVC为海相,丙烯酸酯类为岛相的海岛结构,该结构能很好地吸收和分散冲击能量,使材质具有很好的低温柔韧度,有利于该产品在严寒气候环境下的使用。
发泡调节剂由甲基丙烯酸酯类聚合物和苯乙烯按质量比6:1复配而成,特性粘度为13-15η。
ACR改性剂和发泡调节剂在对板材的降低密度和提高板材低温抗冲性能及韧性有着相互协调补充不可替代的作用。
复合发泡剂由黄发泡剂和白发泡剂按质量比1:1-1:3复配而成,黄发泡剂为偶氮化合物发泡剂,白发泡剂为碳酸氢钠。复合发泡剂分解后的主要产物是氮气和二氧化碳,环保无污染。
环保稳定剂是由钙盐、锌盐、润滑剂、抗氧剂等为主要组分合成的环保型稳定剂;优选为以硬脂酸钙和硬脂酸锌及水滑石为主体合成的钙锌复合稳定剂;进一步优选为百尔罗赫塑料添加剂(江苏)有限公司的R-502、杭州金昌树化学有限公司的JCS-22F。该环保稳定剂绿色环保,不仅可以增强聚氯乙烯加工过程中的热稳定性,而且还能显著提高板材的耐候性。
增塑剂为氧化聚乙烯蜡。
润滑剂由内润滑剂和外润滑剂按质量比为1:1-3复配而成;内润滑剂为硬脂酸、硬脂酸钙中的一种或多种;外润滑剂为聚乙烯蜡、石蜡中的一种或多种。
阻光改性剂为粒径0.2-0.5μm的金红石型钛白粉和粒径50-100μm白色玻璃微珠的复配物,复配重量比为10:1-15:1。粒径0.2-0.5μm的金红石型钛白粉晶格致密稳定,对可见光(波长0.4-0.7μm)能够很好的进行吸收辐射和阻挡,使板材具有良好的不透明度和光洁度,对板材的遮光性能及耐候抗老化性能发挥着主要作用;粒径50-100μm的白色空心玻璃微珠对光线具有优异的漫射和散射性能,能与钛白粉协同提高板材的遮光性能,能在降低板材的密度和成本的同时提高板材的尺寸稳定性和耐高温性能。
偶联剂为γ-氨基丙基三乙氧基硅烷。
颜料为OB类增白剂、耐晒级群青、酞菁类颜料、永固类颜料、炭黑中的一种或多种。
回收料为所述高耐候聚氯乙烯阻光发泡板在制备过程中产生的边料及残次品经粉碎后的粉状物。
本发明所述的高耐候聚氯乙烯阻光发泡板的制备方法,包括以下步骤:
(1)配制母料:将PVC树脂粉、填充剂、ACR改性剂、发泡调节剂、复合发泡剂、环保稳定剂、增塑剂、润滑剂、阻光改性剂、偶联剂、颜料、回收料按配方计量精准配好;
(2)热混:按以下先后顺序将各组分依次加进热混罐内,在50℃低速条件下,加入PVC树脂粉;在60℃低速条件下,加入环保稳定剂;在75℃高速条件下,加入内润滑剂、增塑剂和复合发泡剂;在90℃高速条件下,加入发泡调节剂、ACR改性剂和外润滑剂;在100℃高速条件下,加入填充剂、阻光改性剂、偶联剂、回收料和颜料;最后加热至110-120℃混合;
(3)冷混:将热混后的混合料投入冷混罐冷却至40℃以下,搅拌速度为700-800rpm,搅拌时间为10-30min;
(4)挤出:将冷混后的混合料投入到双螺杆挤出机中塑化挤出,得到熔融物料;
(5)成型:熔融物料经模具挤出后进入水冷定型装置中,依次经冷却定形、裁边,得到高耐候聚氯乙烯阻光发泡板。
步骤(2)中低速条件的搅拌速度是0-700rpm;高速条件的搅拌速度是800-1400rpm。
步骤(4)中双螺杆挤出机的工艺参数设置为:主机转速7-17rpm/min,主机电流95-135A,螺筒温度155-180℃,合流芯温度140-165℃,模具模唇口油温160-180℃。
步骤(5)中的模具为非水冷模具,即,模唇口没有急冷水套或已将急冷水套卸掉的PVC发泡模具。
与现有技术相比,本发明有以下有益效果:
(1)本发明采用金红石型钛白粉和白色玻璃微珠作为阻光改性剂,对可见光能够很好的进行吸收辐射和阻挡,使板材具有良好的不透明度和光洁度,透光率低,可有效遮挡灯箱侧面的光线,使灯箱轮廓更加清晰美观;
(2)本发明采用ACR改性剂、发泡调节剂与阻光剂相配合,在降低板材透光率的同时,也降低了板材密度,并提高了板材的低温抗冲性能及韧性,有利于产品在严寒气候环境下的使用;
(3)本发明在热混步骤中,采用分阶段、分批次地将各配方组分的原料加入到高速混料机中的工艺,充分发挥了稳定剂的作用,提高了混合料的稳定性,有利于着色剂的分散吸附,降低原料对混料设备的磨损,为后期板材生产的稳定性提供保障;
(4)本发明通过调整各组分的混合顺序和混合条件,制备得到的板材具有高柔韧度,可弯曲,借助胶黏剂或钉子可固定于任何弯曲的物体表面而长久不脱落,同时具有高耐候性,日晒雨淋不变色,不风化,不腐烂,不产生污渍污染灯箱,不生锈,不掉色,绿色环保;
(5)本发明的板材易于二次加工,用一般的木工工具即可进行锯、刨、钉、粘、焊接等加工操作,还具有不变形不开裂无需刷漆(有多种颜色)等特殊功能。
具体实施方式
以下结合实施例对本发明做进一步说明,但本发明的保护范围不仅限于此,该领域专业人员对本发明技术方案所作的改变,均应属于本发明的保护范围内。
实施例1
本发明的一种高耐候聚氯乙烯阻光发泡板,由以下重量份数的原料制成:
制备方法如下:
(1)配制母料:将所有原料组分按配方计量精准配好;
(2)热混:按以下先后顺序将各组分依次加进热混罐内,在50℃、转速为700rpm的条件下,加入PVC树脂粉;在60℃、转速为700rpm条件下,加入环保稳定剂R-502;在75℃、转速为1000rpm条件下,加入聚乙烯蜡、偶氮二甲酰胺和碳酸氢钠;在90℃、转速为1000rpm条件下,加入甲基丙烯酸酯类聚合物、苯乙烯、ACR改性剂和硬脂酸钙;在100℃、转速为1000rpm条件下,加入轻质微细碳酸钙、金红石型钛白粉、玻璃微珠、γ-氨基丙基三乙氧基硅烷、回收料、OB类增白剂和耐晒级群青;最后加热至115℃混合;
(3)冷混:将热混后的混合料投入冷混罐冷却至35℃,搅拌速度为700rpm;
(4)挤出:将冷混后的混合料投入到双螺杆挤出机中塑化挤出,得到熔融物料,其中双螺杆挤出机的具体工艺参数为:主机转速15rpm/min,主机电流97A,螺筒温度分别为160℃、165℃、170℃、170℃,合流芯温度160℃,模具模唇口油温165℃;
(5)成型:熔融物料经模具挤出后进入水冷定型装置中,依次经冷却定形、裁边,得到高耐候聚氯乙烯阻光发泡板;所用模具为非水冷模具。
实施例2
本发明的一种高耐候聚氯乙烯阻光发泡板,由以下重量份数的原料制成:
制备方法与实施例1的不同点仅在于步骤(4)中双螺杆挤出机的具体工艺参数为:主机转速17rpm/min,主机电流110A,螺筒温度分别为165℃、165℃、170℃、175℃,合流芯温度160℃,模具模唇口油温175℃。
实施例3
本发明的一种高耐候聚氯乙烯阻光发泡板,由以下重量份数的原料制成:
制备方法与实施例1的不同点仅在于步骤(4)中双螺杆挤出机的具体工艺参数为:主机转速13rpm/min,主机电流100A,螺筒温度分别为165℃、165℃、170℃、175℃,合流芯温度160℃,模具模唇口油温165℃。
对比例1
一种聚氯乙烯发泡板,由以下重量份数的原料制成:
制备方法如下:
(1)配制母料:将所有原料组分按配方计量精准配好;
(2)热混:热混:按以下先后顺序将各组分依次加进热混罐内,在在50℃、转速为700rpm条件下,加入PVC树脂粉;在60℃、转速为700rpm条件下,加入有机锡稳定剂;在75℃、转速为1000rpm条件下,加入聚乙烯蜡、偶氮二甲酰胺和碳酸氢钠;在90℃、转速为1000rpm条件下,加入甲基丙烯酸酯类聚合物、苯乙烯和硬脂酸钙;在100℃、转速为1000rpm条件下,加入重质碳酸钙、回收料、OB类增白剂和耐晒级群青;最后加热至115℃混合;
(3)冷混:将热混后的混合料投入冷混罐冷却至35℃,搅拌速度为700rpm;
(4)挤出:将冷混后的混合料投入到双螺杆挤出机中塑化挤出,得到熔融物料,其中双螺杆挤出机的具体工艺参数为:主机转速15rpm/min,主机电流130A,螺筒温度分别为155℃、160℃、165℃、170℃,合流芯温度160℃,模具模唇口油温175℃;
(5)成型:熔融物料经模具挤出后进入水冷定型装置中,依次经冷却定形、裁边,得到高耐候聚氯乙烯阻光发泡板;所用模具为水冷模具。
对比例2
一种聚氯乙烯发泡板,由以下重量份数的原料制成:
制备方法如下:
(1)配制母料:将所有原料组分按配方计量精准配好;
(2)热混:按以下先后顺序将各组分依次加进热混罐内,在50℃、转速为700rpm的条件下,加入PVC树脂粉;在60℃、转速为700rpm条件下,加入环保稳定剂R-502;在75℃、转速为1000rpm条件下,加入聚乙烯蜡、偶氮二甲酰胺和碳酸氢钠;在90℃、转速为1000rpm条件下,加入硬脂酸钙;在100℃、转速为1000rpm条件下,加入轻质微细碳酸钙、金红石型钛白粉、玻璃微珠、回收料、OB类增白剂和耐晒级群青;最后加热至115℃混合;
(3)冷混:将热混后的混合料投入冷混罐冷却至35℃,搅拌速度为700rpm;
(4)挤出:将冷混后的混合料投入到双螺杆挤出机中塑化挤出,得到熔融物料,其中双螺杆挤出机的具体工艺参数为:主机转速15rpm/min,主机电流97A,螺筒温度分别为160℃、165℃、170℃、170℃,合流芯温度160℃,模具模唇口油温165℃;
(5)成型:熔融物料经模具挤出后进入水冷定型装置中,依次经冷却定形、裁边,得到高耐候聚氯乙烯阻光发泡板;所用模具为非水冷模具。
对比例3
本对比例与实施例1的原料组分相同,制备方法的不同点仅在于步骤(2)热混时,将所有原料组分在室温零转速时同时加入高速混合机中,设定搅拌速度为1000rpm,待物料加热至110℃时,将高温物料放入转速为700rpm的冷混中冷却至40℃,将混合料放入储料斗备用。
将实施例1-3和对比例1-2所制备的聚氯乙烯板材按照国标《GB/T 11500-2008/ISO5-2:2001》、《GB/T 15596-1995/ISO 4582:1980》、《GB/T 8811-2008/ISO 2796:1986》、《GB/T1040-2006/ISO 527:1993》进行性能测试,测试结果如表1所示。
表1实施例1-3和对比例1-2的聚氯乙烯发泡板材性能测试结果
项目 | 实施例1 | 实施例2 | 实施例3 | 对比例1 | 对比例2 | 对比例3 |
厚度(mm) | 3 | 3 | 3 | 3 | 3 | 3 |
密度(g/cm<sup>3</sup>) | 0.50 | 0.49 | 0.51 | 0.49 | 0.89 | 0.50 |
透光率(%) | 0.002 | 0.001 | 0.001 | 20 | 0.001 | 0.1 |
耐老化性能(⊿E) | 1.2 | 0.5 | 0.8 | 7.0 | 3.8 | 4.0 |
加热尺寸变化率(%) | 0.8 | 0.5 | 0.8 | 3.6 | 1.2 | 2.5 |
断裂伸长率(%) | 11.8 | 11.2 | 11.4 | 9 | 10.4 | 10 |
从表1可以看出,本发明制备的聚氯乙烯发泡板材密度小,透光率低,具有高柔韧度和高耐候性;对比例1为常规聚氯乙烯发泡板材,其不含阻光改性剂和ACR改性剂,透光率较高,且耐老化性能和加热尺寸变化率增大,断裂伸长率减小,柔韧度和耐候性均低于本发明产品;对比例2与实施例1相比,不含ACR改性剂、发泡调节剂和偶联剂,制备的聚氯乙烯发泡板材虽然透光率较低,但是其密度较大,且耐候性和柔韧性均有所下降;对比例3与实施例1配方相同,制备方法的热混步骤采用原料组分一次加入的方法,得到的聚氯乙烯发泡板材耐候性较差,柔韧度也降低。
Claims (10)
2.根据权利要求1所述的高耐候聚氯乙烯阻光发泡板,其特征在于:PVC树脂粉为平均聚合度650-1150的PVC树脂粉料。
3.根据权利要求1所述的高耐候聚氯乙烯阻光发泡板,其特征在于:填充剂为粒径0.1-1μm的轻质微细碳酸钙。
4.根据权利要求1所述的高耐候聚氯乙烯阻光发泡板,其特征在于:ACR改性剂为甲基丙烯酸甲酯与丙烯酸乙酯、丙烯腈聚合物的接枝共聚物,特性粘度为9-11η;
发泡调节剂由甲基丙烯酸酯类聚合物和苯乙烯按质量比6:1复配而成,特性粘度为13-15η。
5.根据权利要求1所述的高耐候聚氯乙烯阻光发泡板,其特征在于:复合发泡剂由黄发泡剂和白发泡剂按质量比1:1-1:3复配而成,黄发泡剂为偶氮化合物发泡剂,白发泡剂为碳酸氢钠。
6.根据权利要求1所述的高耐候聚氯乙烯阻光发泡板,其特征在于:阻光改性剂为粒径0.2-0.5μm的金红石型钛白粉和粒径50-100μm白色玻璃微珠的复配物,复配重量比10:1-15:1。
7.根据权利要求1所述的高耐候聚氯乙烯阻光发泡板,其特征在于:环保稳定剂是由钙盐、锌盐、润滑剂、抗氧剂等为主要组分合成的环保型稳定剂;
增塑剂为氧化聚乙烯蜡;
润滑剂由内润滑剂和外润滑剂按质量比为1:1-3复配而成;内润滑剂为硬脂酸、硬脂酸钙中的一种或多种;外润滑剂为聚乙烯蜡、石蜡中的一种或多种;
偶联剂为γ-氨基丙基三乙氧基硅烷;
颜料为OB类增白剂、耐晒级群青、酞菁类颜料、永固类颜料、炭黑中的一种或多种;
回收料为所述高耐候聚氯乙烯阻光发泡板在制备过程中产生的边料及残次品经粉碎后的粉状物。
8.一种权利要求1-7任一项所述的高耐候聚氯乙烯阻光发泡板的制备方法,其特征在于:包括以下步骤:
(1)配制母料:将PVC树脂粉、填充剂、ACR改性剂、发泡调节剂、复合发泡剂、环保稳定剂、增塑剂、润滑剂、阻光改性剂、偶联剂、颜料、回收料按配方计量精准配好;
(2)热混:按以下先后顺序将各组分依次加进热混罐内,在50℃低速条件下,加入PVC树脂粉;在60℃低速条件下,加入环保稳定剂;在75℃高速条件下,加入内润滑剂、增塑剂和复合发泡剂;在90℃高速条件下,加入发泡调节剂、ACR改性剂和外润滑剂;在100℃高速条件下,加入填充剂、阻光改性剂、偶联剂、回收料和颜料;最后加热至110-120℃混合;
(3)冷混:将热混后的混合料投入冷混罐冷却至40℃以下,搅拌速度为700-800rpm,搅拌时间为10-30min;
(4)挤出:将冷混后的混合料投入到双螺杆挤出机中塑化挤出,得到熔融物料;
(5)成型:熔融物料经模具挤出后进入水冷定型装置中,依次经冷却定形、裁边,得到高耐候聚氯乙烯阻光发泡板。
9.根据权利要求8所述的高耐候聚氯乙烯阻光发泡板的制备方法,其特征在于:步骤(2)中低速条件的搅拌速度是0-700rpm;高速条件的搅拌速度是800-1400rpm。
10.根据权利要求8所述的高耐候聚氯乙烯阻光发泡板的制备方法,其特征在于:步骤(4)中双螺杆挤出机的工艺参数设置为:主机转速7-17rpm/min,主机电流95-135A,螺筒温度155-180℃,合流芯温度140-165℃,模具模唇口油温160-180℃。
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CN114857845A (zh) * | 2022-04-29 | 2022-08-05 | 宁国市惠丰塑料制品有限公司 | 一种彩色冰箱边框 |
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CN116837488A (zh) * | 2023-07-01 | 2023-10-03 | 东莞市威骏不织布有限公司 | 一种高透耐用反光布及其制备方法 |
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