How to Reduce Flooding and Floating in White Pigmented Coatings starts with one practical rule: evaluate the pigment inside the complete production formulation, not from TiO2 assay or a single supplier value. flooding and floating in white coatings performance depends on the pigment surface, formulation chemistry, dispersion process, film structure, and end-use requirement. A controlled trial should connect those variables to hiding, appearance, processing, durability, and cost.
Table Of Contents
Why Flooding And Floating Control Changes Pigment Performance
Flooding is a relatively uniform color change across a film, while floating creates visible separation patterns at the surface. Differences in pigment mobility, density, surface energy, flocculation state, solvent flow, and drying rate drive both defects.
For this reason, flooding and floating in white coatings should be treated as a formulation-and-process decision. A white base can appear uniform alone but develop streaks or shade variation after tinting. Reformulating colorant without checking TiO2 dispersion and rheology may move the defect instead of removing its cause. The useful question is not whether one certificate number is higher, but whether the candidate creates a stable, reproducible coating within the plant’s operating limits.
What To Compare Before Approving Flooding And Floating In White Coatings
Use drawdowns with and without rub-up, vertical and horizontal panels, controlled film thickness, viscosity profiles, color difference, and drying observations. Hold tint paste, mixing time, substrate, airflow, and application method constant. This prevents a stronger result from being created by a hidden change in the test rather than by the pigment.
| 决策区域 | 测量 | 为什么这很重要 |
|---|---|---|
| Pigment mobility and flocculation state | Rub-up, Delta E, surface pattern, sag | Separates color development from migration |
| 分散质量 | 细度、残留物、能量、温度 | 将工艺限制与颜料行为分开 |
| 干膜效率 | 对比度、色调强度、光泽度 | 在受控胶片构建下显示出有用的光学性能 |
| 稳健性 | 储存老化和重复批次 | 检查结果是否稳定且可重复 |
Use supplier data to define the starting window, then verify flooding and floating in white coatings with your own raw materials. Laser-diffraction results should be interpreted under a declared method because ISO 13320 describes method-dependent equivalent-sphere distributions. A grind gauge, covered by ASTM D1210, measures coarse particles or agglomerates in a dispersion; it does not replace an optical-performance test.
A Controlled Flooding And Floating In White Coatings Laboratory Workflow
Prepare a small matrix that varies dispersant and rheology strategy one factor at a time. Evaluate immediately and through drying because surface separation may appear only while solvent or water is leaving the film. Randomize sample order where practical and repeat the control so drift in mixing, application, or measurement becomes visible.
- 在打开样本之前定义通过/失败限制。.
- 在相同温度下调节原材料和面板。.
- 记录充电顺序、速度、时间、批量温度和能量。.
- 在完成放下之前测试磨机底座。.
- 涂抹等量的湿膜或干膜厚度并使用相同的固化时间表。.
- 重复关键测量并保留标记的样品。.
How To Diagnose Disappointing Flooding And Floating In White Coatings Results
Strong rub-up color change indicates unequal flocculation. Cellular patterns can point to surface-tension gradients or convection, while vertical shade differences may involve sag and pigment settling. Change one variable at a time and preserve the original control. Otherwise, simultaneous changes to dispersant, shear, binder, and pigment loading make the cause impossible to identify.
与光学拥挤分开分散
If fineness improves but hiding does not, check film thickness, pigment volume concentration, extender spacing, and refractive-index contrast. If tint strength or gloss changes after a rub-up or after letdown, investigate flocculation. This distinction keeps a flooding and floating in white coatings project from becoming an endless increase in milling time.
计算交付价值
Compare cost at the dosage that actually passes, including dispersion time, yield loss, solvent or water adjustment, and rework risk. The cheapest price per tonne is not necessarily the lowest cost per passing litre of paint. A stable flooding and floating in white coatings grade can create value through higher throughput and fewer corrections even when its invoice price is higher.
Flooding And Floating In White Coatings Supplier Qualification Checklist
Ask TiO2 and colorant suppliers for compatibility data, recommended dispersants, density and surface-treatment information, and troubleshooting support in the complete tinted formulation. Also confirm specification limits, test methods, change-notification practice, certificate availability, traceability, packaging, lead time, and technical support.
- 将等级与粘合剂、工艺、光泽和曝光相匹配。.
- 请求测试方法,而不仅仅是典型值。.
- 在完全批准之前试用多个生产批次。.
- 保留经批准的对照和保留的样品。.
- 围绕预测工厂性能的属性设置传入检查。.
Longtai供应金红石二氧化钛涂料,支持应用型分级筛选 审核 the 二氧化钛产品范围, 然后使用我们的指南 测试tio2分散性 和理解 二氧化钛质量检验.
常见问题
TDS可以选择最佳等级吗?
No. A TDS is useful for screening, but flooding and floating in white coatings must be verified in the target formulation because binder, additives, shear, pigment volume concentration, and film build affect the result.
候选人是否应该使用相同的分散剂剂量?
1次固定剂量比较, 暴露灵敏度, 然后分别优化有前途的候选者, 不同的色素表面可以有不同的稳定剂量窗口, 不公平的剂量可以拒绝合适的等级。.
应该批准多少批?
Evaluate multiple representative lots when supply risk matters. One laboratory sample demonstrates potential; repeated lots show whether flooding and floating in white coatings remains inside the process and performance window.
需要成绩推荐吗? 联系龙泰 凭借您的粘合剂、配方类型、应用方法、目标特性和当前控制等级。我们可以推荐一个起始样品和一个实用的比较计划。.