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浅谈彩涂板用环氧底漆存在瓶颈时期_高耐候油漆
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浅谈彩涂板用环氧底漆存在瓶颈时期

作者:天物彩板 编辑:天物彩板 来源: 唐山天物彩板有限公司 发布日期:2021-09-03 09:23
信息摘要:
浅谈彩涂板用环氧底漆存在瓶颈时期 随着彩涂板行业的快速发展,开发性能优异的彩涂板涂料以满足先进、多样化产品的需求已成为国内外研究的热点。其中,制备附着力好、柔韧性好、与面漆相容性好的底漆对提高彩板涂料的性能至关重要。以电镀锌板为基材, 彩涂板经烘烤后涂有有机漆的产品为电镀锌彩涂板。由于电镀锌板的锌层很薄...

浅谈彩涂板用环氧底漆存在瓶颈时期

随着彩涂板行业的快速发展,开发性能优异的彩涂板涂料以满足先进、多样化产品的需求已成为国内外研究的热点。其中,制备附着力好、柔韧性好、与面漆相容性好的底漆对提高彩板涂料的性能至关重要。以电镀锌板为基材, 彩涂板经烘烤后涂有有机漆的产品为电镀锌彩涂板。由于电镀锌板的锌层很薄,锌含量通常为20/20g/m2,因此该产品不适合在室外制作墙壁和屋顶。但由于其外形美观,加工性能优良,主要用于家用电器、音响、钢制家具、室内装饰等。

由于影响因素众多,底漆的制备是一个复杂的过程。近年来,国内研究者采用正交试验法确定各种因素对环氧底漆性能的影响,从而以较少的步骤合理确定最佳配方。制备的漆膜具有明显的硬度和耐溶剂性,附着力优异。据专家介绍,他们重点研究了六个影响因素:色基比、交联剂用量、催化剂、消泡剂、表面活性剂还原剂和润湿分散剂。彩涂板选用的交联固化剂为脲醛树脂sm-526,实验表明,交联固化剂的用量对漆膜的附着力影响最大,对漆膜的抗弯曲性和耐MEK擦拭性影响较大,对漆膜的硬度影响不大。由于国产卷材涂料在品种和质量上落后于国外产品,中国厂家在生产彩板时不得不采用昂贵的进口涂料,这对我国彩板行业的发展产生了很大影响。因此,专家呼吁国内行业尽快突破彩涂板环氧底漆的瓶颈。
15%时,除硬度与其他3个等级相同外,彩涂板其他性能较差;在20%时,MEK的耐擦洗性和耐弯曲性最好,附着力一般(平均1.3);在25%时,漆膜的耐MEK擦拭性和硬度最好,其余两项性能较差。考虑到色板的加工性能,研究人员选择了20%的交联固化剂。专家表示,上述研究已经有了一个良好的开端,但要真正突破彩涂板环氧底漆的瓶颈还需要进一步的研究。试验中,四种剂量对硬度的影响不明显(平均值为5.0);交联固化剂用量为10%时,附着力最好(平均值达到0.3),MEK耐擦洗性较差,弯曲性能较好。
 

 

With the rapid development of color coated plate industry, the development of color coated plate coatings with excellent performance to meet the needs of advanced and diversified products has become a research hotspot at home and abroad. Among them, the preparation of primer with good adhesion, flexibility and good compatibility with the top coat is very important to improve the performance of color plate coating. The product obtained by baking with the electro galvanized sheet as the substrate and coated with organic paint is the electro galvanized color coated sheet. Because the zinc layer of the electro galvanized sheet is thin and the zinc content is usually 20 / 20g / m2, the product is not suitable for making walls and roofs outdoors. However, due to its beautiful appearance and excellent processing performance, it can be mainly used for household appliances, acoustics, steel furniture, indoor decoration, etc.

Due to many influencing factors, the preparation of primer is a complex process. Recently, domestic researchers have used orthogonal experiment to determine the influence of various factors on the performance of epoxy primer, so as to reasonably determine the best formula with less steps. The prepared paint film has obvious advantages of hardness and solvent resistance, and excellent adhesion. According to experts, they focused on six influencing factors: color base ratio, amount of crosslinking agent, catalyst, defoamer, surfactant reducing agent and wetting dispersant. The selected crosslinking curing agent is urea formaldehyde resin sm-526. The experiment shows that the amount of crosslinking curing agent has the greatest impact on the adhesion of the paint film, has a great impact on the bending and MEK wiping resistance, and has no significant impact on the hardness of the paint film. Because domestic coil coatings lag behind foreign products in variety and quality, Chinese manufacturers have to adopt expensive imported coatings when producing color plates, which greatly affects the development of color plate industry in China. Therefore, experts call on the domestic industry to break through the bottleneck of epoxy primer for color coated plate as soon as possible.
At 15%, except that the hardness is the same as other 3 levels, other properties are poor; At 20%, MEK wiping resistance and bending resistance are the best, and the adhesion is general (mean 1.3); At 25%, the MEK wiping resistance and hardness of the paint film are the best, and the other two properties are poor. Considering the processability of the color plate, the researchers selected 20% of the crosslinking curing agent. Experts said that the above research has made a good start, but further research is needed to truly break through the bottleneck of epoxy primer for color coated plate. In the experiment, the effect of four dosage on hardness was not obvious (mean value was 5.0); When the amount of crosslinking curing agent is 10%, the adhesion is the best (the average value reaches 0.3), the MEK wiping resistance is relatively poor, and the bending performance is better.
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