CN116676030A - 一种用于聚氨酯保温泡沫的膨胀型热障涂料及制备方法 - Google Patents
一种用于聚氨酯保温泡沫的膨胀型热障涂料及制备方法 Download PDFInfo
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Abstract
一种用于聚氨酯保温泡沫的膨胀型热障涂料及制备方法,其原料包括以下成分:成炭剂,所述成炭剂包括可膨胀石墨第一发泡成炭剂和淀粉第二成炭剂,其中所述第一发泡成炭剂与所述第二成炭剂的重量比为3∶1至1∶3;粘结剂,所述粘结剂包括聚氨酯预聚体和多元醇化合物,其中所述聚氨酯预聚体的NCO基团与所述多元醇化合物的OH基团的摩尔比为1.05∶1至1.1∶1;酸催化剂;以及成核剂,所述成炭剂、粘结剂、酸催化剂和成核剂的质量比为:5‑10:40‑60:10‑50:5‑15。将该热障涂料涂施于泡沫外表面能够形成牢固美观的外壳,能够在泡沫临界熔点温度以下形成热障炭质层,从而保护硬质泡沫,间接提升了聚氨酯硬质泡沫的燃烧性能等级。
Description
技术领域
本发明属于功能性涂料领域,具体的涉及一种聚氨酯膨胀型热障涂料。
背景技术
硬质喷涂聚氨酯泡沫是一种具有保温与防水作用的高分子合成材料,其导热系数低,是目前所有保温材料中导热系数最低的材料。广泛用作住宅、商业办公室、工业、航空和航天领域的保温材料。
为了降低电焊等闪火的风险,或在其他火源时延长泡沫达到其自燃温度的时间。最常见的防火屏障是在聚氨酯泡沫上放置石膏板。或者将石膏纤维板、铁皮做壳材,聚氨酯硬质泡沫作为芯板制成的保温板。这两种方案都会显著增加了材料的平米重量。
膨胀型防火涂料通常用于钢结构的防火保护,典型的膨胀型涂料将在220℃左右发生热反应或膨胀并形成绝缘屏障。因此,常规的钢结构用膨胀型涂料不会在较低的温度下工作,而聚氨酯泡沫通常在约170-190℃开始熔化。因此,常规的钢结构用膨胀型涂料不适用于直接作为聚氨酯保温泡沫热障保护。
发明内容
为了解决现有技术膨胀型涂料不适用于直接作为聚氨酯保温泡沫热障保护的问题,本发明提供一种用于聚氨酯保温硬泡的膨胀型热障涂料。
本发明的技术方案如下:
一种用于聚氨酯保温泡沫的膨胀型热障涂料,其特征在于原料包括以下成分:
成炭剂,所述成炭剂包括平均粒子尺寸为300微米至450微米的可膨胀石墨第一发泡成炭剂和平均粒子尺寸为0.5微米至250微米的淀粉第二成炭剂,其中所述第一发泡成炭剂与所述第二成炭剂的重量比为3∶1至1∶3;
粘结剂,所述粘结剂包括聚氨酯预聚体和多元醇化合物,其中所述聚氨酯预聚体的NCO基团与所述多元醇化合物的OH基团的摩尔比为1.05∶1至1.1∶1;
酸催化剂;以及
成核剂,
所述成炭剂、粘结剂、酸催化剂和成核剂的质量比为:5-10:40-60:10-50:5-15。
优选的,所述聚氨酯预聚体为MDI预聚体,其平均官能度是2-2.9,异氰酸酯含量是6-30wt%。
进一步优选的,所述平均官能度为2.0-2.5,所述异氰酸酯(NCO-值)含量为20-30%。
优选的,所述多元醇化合物为羟基含量5%-10%的蓖麻油改性多元醇。
优选的,所述酸催化剂为四硼酸铵、聚磷酸铵,其中四硼酸铵与聚磷酸铵的重量比为2∶1至1∶2。
优选的,成核剂为钛白粉。
优选的,还包括分子筛、分散剂、消泡剂、紫外线吸收剂和催化剂二丁基二月桂酸锡,
所述分子筛与所述成炭剂的质量比为1:1-4,
所述分散剂与所述成炭剂的质量比为1:10-22,
所述消泡剂与所述成炭剂的质量比为1:30-45,
所述紫外线吸收剂与所述成炭剂的质量比为1:10-50;
所述催化剂与所述成炭剂的质量比为1:65-90。
前述的一种用于聚氨酯保温泡沫的膨胀型热障涂料的制备方法,其特征在于包括以下步骤:
在干净密闭干燥的搅拌釜中加入所述多元醇化合物,开启低速搅拌后加入分子筛、分散剂和消泡剂,混合5-10min后,缓慢加入成炭剂,再加入酸催化剂、成核剂粉体,加毕后提高搅拌速度,高速分散45-60分钟,然后调低转速,在低剪切下加入紫外线吸收剂和催化剂,搅拌8-10分钟后出料妥存,使用前,将上述得到物料和聚氨酯预聚体均匀混合在一起,便得到所述膨胀型热障涂料。
前述的一种用于聚氨酯保温泡沫的膨胀型热障涂料涂布的聚氨酯保温泡沫。
优选的,该聚氨酯保温泡沫是密度在20-55kg/m3范围内的喷涂硬质聚氨酯泡沫。
本发明的有益技术效果如下:
本发明提供了一种用于在火与可燃聚氨酯保温硬泡之间提供热障的涂料。本发明的膨胀型涂料能够在低于泡沫熔点的温度下开始反应,形成防止或减缓泡沫达到170℃度临界熔点的热屏障。
经测试,膨胀型热障涂料能够在低于聚氨酯硬泡烧蚀温度下发泡成碳,可在较长时间的火灾中产生具有出色结构完整性的致密炭质层。
此外,本发明的热障涂料为无溶剂高固体份材料,能够显著减少涂层干燥过程中的收缩,增加单道施工厚度,降低施工成本。因为选择了和硬质聚氨酯保温泡沫同体系的聚氨酯作为粘结剂,所以涂层对于保温聚氨酯泡沫的粘附力更强,更因为配方设计时去除了常规膨胀型防火涂料配方中的发泡剂组份,使得反应产生的炭层倍率低,炭层更加致密,对火或热的隔绝作用更好。本发明的另一个优异效果是能够提升硬质聚氨酯泡沫依照GB8624《建筑材料及制品燃烧性能分级》测试的燃烧性能等级。
本发明设计开发了一种简单有效地应用于硬质聚氨酯泡沫的热障涂料。将该热障涂料涂施于泡沫外表面能够形成牢固美观的外壳,能够在泡沫临界熔点温度以下形成热障炭质层,从而保护硬质泡沫,间接提升了聚氨酯硬质泡沫的燃烧性能等级。
具体实施方式
下面将通过具体实施例对本发明作进一步的详细说明,但并不是对本发明技术方案的限定,所有基于本发明所作出的变化或等同替换,均应属于本发明的保护范围。
实施例1-3
各实施例的膨胀型热障涂料使用的组分包括:
MDI聚氨酯预聚物:SUPRASEC 1004、SUPRASEC 2004、SUPRASEC 1412、SUPRASEC2008、SUPRASEC 2020、SUPRASEC 2024、SUPRASEC 2024、SUPRASEC 2029、SUPRASEC 2060、SUPRASEC 2067、SUPRASEC 2344、SUPRASEC 2405,购自Huntsman公司。
分散剂:BYK118、BYK2055、BYK2155,购自BYK公司。
消泡剂:BYK 501、BYK 530,购自BYK公司。
蓖麻油改性多元醇:901、/>904、/>912、/>921、941,来自Alberdingk Boley公司。
成核剂钛白粉:R215钛白粉,购自中核华原钛白股份有限公司。
酸催化剂聚磷酸铵:JLS-APP,购自杭州捷尔思阻燃化工有限公司。
酸催化剂四硼酸铵:购自上海阿拉丁生化科技股份有限公司。
可膨胀石墨:可膨胀石墨是一种层间化合物,其在加热到适当温度时,可瞬间迅速分解并产生大量气体,使石墨沿轴方向膨胀成蠕虫状的新物质,具有良好的阻燃性和保温性。ADT KP251、ADT249、ADT252,购自石家庄科鹏阻燃材料厂。
淀粉:玉米工业淀粉,购自山东鑫瑞杰生物科技有限公司。
催化剂:二丁基二月桂酸锡(DBTL),购自山东永邦化工科技有限公司。
光稳定剂:Tinuvin 292,BASF公司。
分子筛:3A分子筛活化粉,购自广东鑫淘科技有限公司。
制备该涂料时,在一个干净密闭的搅拌釜中(不含水分)加入多元醇化合物,开启低速搅拌后加入分子筛、分散剂和消泡剂,混合5-10min后,缓慢按比例加入成炭剂可膨胀石墨、淀粉,加入酸催化剂聚磷酸铵和四硼酸铵,成核剂钛白粉等粉体,加毕后提高搅拌速度,高速分散45-60分钟。然后调低转速,在低剪切下加入紫外线吸收剂和催化剂,搅拌10分钟后出料妥存。使用前,将上述物料和聚氨酯预聚体均匀混合在一起,便可以使用。
应用该涂料时,可通过常规方式如辊涂或刷涂施加到聚氨酯硬质泡沫表面,但优选用无气喷涂机喷涂的方式。涂层的典型应用范围为100-1000微米。聚氨酯泡沫绝缘材料是密度在28-55kg/m3范围内的喷涂硬质聚氨酯泡沫。
为了更好的热障效果,可以多道施工形成更厚的热障涂层。此外,如果长期暴露于空气当中,推荐在热障涂层外面再施工耐久性保护面漆。
热障性能测试方法:将各实施例的膨胀型热障涂料喷涂在32kg/m3的闭孔喷涂聚氨酯保温泡沫上,硬质泡沫样块尺寸为15*15*1cm,涂层干膜厚度100微米。将测试样板用铁架加紧,带涂层的硬质泡沫侧正对火源,不带涂层的硬质泡沫面按放热电偶,火源采用丁烷喷灯。
应用该方法测试膨胀型热障涂层保护下的聚氨酯保温泡沫在火烧15分钟后的平均背面温度。
各实施例用于聚氨酯保温泡沫的膨胀型热障涂料的物料配比及热障性能如下:
实施例的结果说明了将本发明热障涂料以最低膜厚100微米直接应用于聚氨酯泡沫时,涂层遇火会发生热膨胀从而形成热屏障,保护泡沫在15min时间内背面温度没有超过170℃的临界熔化温度,泡沫未被点燃,保持了泡沫的结构完整性。证明本发明的膨胀材料作为热障材料的有效性。
Claims (10)
1.一种用于聚氨酯保温泡沫的膨胀型热障涂料,其特征在于原料包括以下成分:
成炭剂,所述成炭剂包括平均粒子尺寸为300微米至450微米的可膨胀石墨第一发泡成炭剂和平均粒子尺寸为0.5微米至250微米的淀粉第二成炭剂,其中所述第一发泡成炭剂与所述第二成炭剂的重量比为3∶1至1∶3;
粘结剂,所述粘结剂包括聚氨酯预聚体和多元醇化合物,其中所述聚氨酯预聚体的NCO基团与所述多元醇化合物的OH基团的摩尔比为1.05∶1至1.1∶1;
酸催化剂;以及
成核剂,
所述成炭剂、粘结剂、酸催化剂和成核剂的质量比为:5-10:40-60:10-50:5-15。
2.根据权利要求1所述的热障涂料,其特征在于所述聚氨酯预聚体为MDI预聚体,其平均官能度是2-2.9,异氰酸酯含量是6-30wt%。
3.根据权利要求2所述的热障涂料,其特征在于所述平均官能度为2.0-2.5,所述异氰酸酯(NCO-值)含量为20-30%。
4.根据权利要求1所述的热障涂料,其特征在于所述多元醇化合物为羟基含量5%-10%的蓖麻油改性多元醇。
5.根据权利要求1所述的热障涂料,其特征在于所述酸催化剂为四硼酸铵、聚磷酸铵,其中四硼酸铵与聚磷酸铵的重量比为2∶1至1∶2。
6.根据权利要求1所述的热障涂料,其特征在于成核剂为钛白粉。
7.根据权利要求1所述的热障涂料,其特征在于还包括分子筛、分散剂、消泡剂、紫外线吸收剂和催化剂二丁基二月桂酸锡,
所述分子筛与所述成炭剂的质量比为1:1-4,
所述分散剂与所述成炭剂的质量比为1:10-22,
所述消泡剂与所述成炭剂的质量比为1:30-45,
所述紫外线吸收剂与所述成炭剂的质量比为1:10-50;
所述催化剂与所述成炭剂的质量比为1:65-90。
8.权利要求1-7任一所述的一种用于聚氨酯保温泡沫的膨胀型热障涂料的制备方法,其特征在于包括以下步骤:
在干净密闭干燥的搅拌釜中加入所述多元醇化合物,开启低速搅拌后加入分子筛、分散剂和消泡剂,混合5-10min后,缓慢加入成炭剂,再加入酸催化剂、成核剂粉体,加毕后提高搅拌速度,高速分散45-60分钟,然后调低转速,在低剪切下加入紫外线吸收剂和催化剂,搅拌8-10分钟后出料妥存,使用前,将上述得到物料和聚氨酯预聚体均匀混合在一起,便得到所述膨胀型热障涂料。
9.利用权利要求1-8任一所述的一种用于聚氨酯保温泡沫的膨胀型热障涂料涂布的聚氨酯保温泡沫。
10.根据权利要求9所述的聚氨酯保温泡沫,其特征在于所述聚氨酯保温泡沫是密度在20-55kg/m3范围内的喷涂硬质聚氨酯泡沫。
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