Study on Surface Coating Process of Bamboo Scrimber
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摘要: 【目的】重组竹作为近年来的新型复合材料,具有优良的物理力学性能和机械加工性能,应用于家具、建筑等多个行业。由于使用环境复杂且竹质材料有吸湿膨胀等特性,又经常处于高温高湿和微生物繁杂的条件下,材料耐久度和物理性能降低。探究重组竹表面涂饰工艺对漆膜性能的影响,有助于解决重组竹材料在复杂环境下导致材料耐久度和物理性能降低的问题。【方法】通过探究不同工艺条件下重组竹涂饰后漆膜性能的变化,主要研究涂饰工艺过程中砂光工艺、聚氨酯底漆涂布量、硝基漆面漆涂布量、干燥条件以及硝基漆面漆涂布次数对漆膜性能的影响。【结果】重组竹初期表面先用180目砂纸再用320目砂纸砂光;聚氨酯底漆涂布量为120 g·m-2;中间层硝基漆涂布量250 g·m-2基础上,硝基漆面漆涂布量为150 g·m-2,涂布1次,漆膜附着力为1级、硬度为2H、耐磨性等级为1级、光泽度为70.6、耐水蒸气等级为2级。【结论】探明了重组竹初期砂光工艺、聚氨酯底漆涂布量、硝基漆面漆涂布量、干燥条件以及硝基漆面漆涂布次数的变化对漆膜性能都有很大影响,其中最佳的涂饰工艺为:用180目砂纸砂光重组竹表面再用320目砂纸砂光,刷涂120 g·m-2的聚氨酯漆后进行室温干燥1 h,320目砂纸轻磨表面刷涂250 g·m-2中间层硝基漆室温干燥48 h,320目砂纸轻磨表面刷涂150 g·m-2硝基漆面漆,室温干燥48 h。Abstract: 【Objective】 As a new composite material in recent years,bamboo scrimber has excellent physical and mechanical properties and machining properties and has been used in many industries such as furniture and construction. The durability and physical properties of the material are reduced due to the complex use environment and the characteristics of moisture absorption and expansion of bamboo materials,which are also often exposed to the environment of high temperature,humidity and microbial diversity. To explore the influence of the surface coating process on the paint film performance of bamboo scrimber helps to solve the problem that the durability and physical properties of bamboo scrimber materials decrease in the complex environments. 【Method】 In this paper,we explored the changes in paint film properties of bamboo scrimber after coating in different process conditions,and mainly studied the effects of the sanding process,coating amount of polyurethane primer,spreading rate of nitrocellulose topcoat,drying conditions,and the number of coating times of nitrocellulose topcoat on the paint film properties during the coating process. 【Result】 The initial surface of bamboo scrimber was firstly sanded with 180-grit sandpaper and then 320-grit sandpaper;the coating amount of polyurethane primer was 120 g·m-2;on the basis that the coating amount of nitrocellulose paint upon the intermediate layer of was 250 g·m-2,the coating amount of nitrocellulose topcoat was 150 g·m-2,coated 1 time,and the film adhesion is grade 1,hardness is 2H,abrasion resistance grade is grade 1,gloss is 70.6,and water vapor resistance grade is grade 2. 【Conclusion】 This study has explored that the variation of the initial sanding process of bamboo scrimber,the amount of polyurethane primer coating,the amount of nitrocellulose topcoat coating,the drying conditions and the number of nitrocellulose topcoat coating have a great influence on the performance of the paint film,and the best coating process is:sand the surface of the bamboo scrimber with 180-grit sandpaper,then with 320-grit sandpaper,and then brush with 120 g·m-2 polyurethane paint,and dry it at room temperature for 1 hour. Lightly sand the surface with 320-grit sandpaper and brush it with 250 g·m-2 intermediate-layer nitrocellulose paint,and dry it at room temperature for 48 hours,lightly sand the surface with 320-grit sandpaper and brush the surface with 150 g·m-2 nitrocellulose topcoat and dry it at room temperature for 48 hours.
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Key words:
- Bamboo scrimber /
- Coating /
- Paint film performance
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