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水性涂料的消泡剂

2012-10-20 07:31 作者: 来源: 本站 浏览: 911 次 我要评论(11条) 字号:

摘要: 摘要:成功制备了适用于水性涂料的消泡剂,并与国外产品进行了对比。效果标明:该产品活性组分消泡功率更高,具有较高的运用和推广价值。 水性涂料以水替代有机溶剂、以合成树脂替代植物油,不只提高了涂料的功用、处理了涂料施工中溶剂蒸腾带来的危害,而且安全、卫生、价廉、环...

摘要:成功制备了适用于水性涂料的消泡剂,并与国外产品进行了对比。效果标明:该产品活性组分消泡功率更高,具有较高的运用和推广价值。

水性涂料以水替代有机溶剂、以合成树脂替代植物油,不只提高了涂料的功用、处理了涂料施工中溶剂蒸腾带来的危害,而且安全、卫生、价廉、环保,因此水性涂料出产技术得到了空前的注重与展开。

由于在配方中不可避免地选用了各种添加剂(大多是表面活性剂),水性涂料的泡沫问题极点显着,因此有必要添加消泡剂。水性涂料最常用的消泡剂主要是矿物油(可以富含少量有机硅)和有机硅两大类产品。目前国内大多数水性涂料厂家运用矿物油消泡剂,每年其消耗量大约在5000t左右,其间大多数产品都来自进口,价格昂贵。为了完结矿物油消泡剂的优质国产化,结束替代国外进口产品,作者选用廉价的添加剂替代有机硅组分,减少矿物油用量,并进一步选用乳化工艺,成功制备了适用于水性涂料的消泡剂,为国内同行业的出产厂家供应一种可行的出产路途。

1实验

1.1药品

矿物油;疏水白炭黑;N,N′-硬脂酰乙二胺;松散剂;添加剂A(廉价);CMC;Span60;聚氧乙烯(40)硬粉状消泡剂脂酸酯;山梨酸。

1.2步骤

1.2.1预混液的制备

将18g疏水白炭黑参与己加热至100℃的150g矿物油中,搅拌混合,将混合物冷却至室温得到二氧化硅/矿物油松散液。

将70gN,N′-硬脂酰乙二胺、2g松散剂、同30g矿物油混合,加热,参与30g廉价的添加剂A,加热至120~135℃,保温20min,与室温下的二氧化硅/矿物油松散液混合,经胶体磨研磨均化得到预混液。

1.2.2增稠液的制备

将196g去离子水加热至70℃以上,在搅拌状态下缓慢参与4g增稠剂CMC,保温搅拌约60min,冷却至35℃聚醚消泡剂以下得增稠液。

1.2.3乳化

将260g去离子水加热并保温在70~80℃,再将60g乳化剂(5.5份Span60与4.5份聚氧乙烯硬脂酸酯混合物)加至热水中,搅拌10min,然后在恰当搅拌下缓慢参与预混液,一同坚持温度在70℃以上。继续混合30~60min,混合均匀后冷却至55℃,经胶体磨研磨至颗粒粒径在10μm以下,与增稠液高速搅拌混合30min,参与2g山梨酸和178g去离子水搅拌均化60min,即得消泡剂制品。

1.3技术功用方针

本样品技术方针为白色乳液;水中易松散;贮存不分层,有用期1年;有用成分30%。

2效果谈论

2.1活性组分的选择

用矿物油、植物油、高级醇、高级脂肪酸分别与疏水白炭黑、N,N′-硬脂酰乙二胺、高级脂肪酸金属皂、高级脂肪酸甘油酯、丙二醇环氧乙烷加聚物、添加剂A、有机硅树脂及改性有机硅树脂等分别制作,效果由矿物油、N,N′-硬脂酰乙二胺和添加剂A复合制作的活性组分概括功用较佳。

2.2乳化剂的选择

用Span60、OP-10、Tween85、聚氧乙烯硬脂酸酯等乳化剂进行乳化,发现Span60与聚氧乙烯硬脂酸酯复配进行乳化比拟简略、安稳。

2.3消泡功用检验

以毕克(BYK)、罗纳普朗克(RHONEPOULENC)及汉高(Henkel)公司产品BYK-034、681F、NopcoNXZ以及Foamaster111为对比产品。称取200g纯丙乳液(AC-261),参与消泡剂,以2000r/min转速搅拌10min,然后当即测密度;2周老化后再次以2000r/min转速搅拌10min,当即测密度。

对比产品添加量为0.2%,本样品添加量为0.4%即有用组分添加量为0.12%。在纯丙乳液(AC-261)中消泡功用检验效果见图1。

与国外产品比拟,在有用组分用量仅为进口产品的60%时,破泡、抑泡功用和方针均接近于国外产品,而持久性则更加优秀;活性组分消泡功率更高,剔除了有机硅组分,避免了发作缩孔的可以。

消泡功豆浆消泡剂用检验效果

3结论

环保型水性涂料矿物油消泡剂制备工艺简略可行。所得产品的各项功用方针均接近于国外优质产品,且抑泡持久性则更加优秀。本品贮存安稳不分层、不会发作燃烧和爆炸危险、有用期为12个月,完全可以作为国外同类产品的替代品,值得在国内同行业的出产厂家推广使用。

本文由http://www.jhskt.cn整理

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