water property coating material process and as tips/techniques 一览

industry: water property coating material

water property coating material coating 装工序 and solvent agent type coating material basic same, in equipment selection material and process parameters setting upper according to water property coating material features 进行选取. its type process is: front 处理【 upper 线 →预脱脂 →脱脂 → water 洗1 → water 洗2 →（ 离子 water 洗1） →（ table/sheet 调） →（磷化） → water 洗3 → water 洗4 →（ 离子 water 洗2） →人工吹 water →烘 dry 】 → strong/high cold →喷底漆 →流平 → preheating 期 →烘 dry → cooling （ strong/high cold ） →喷面漆 →流平 → preheating 期 →烘 dry → cooling （ strong/high cold ） → lower 线

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1, front 处理

due to water property coating material water as is dilute agent, water surface force is 72.6dyn/cm（达因/ cm ）, need ratio generally has machine solvent agent large, is coating material commonly used has machine solvent agent 2.5倍（见 lower table/sheet ）, difficult lubricating wet 底材, easy generate shrink 孔, therefore 一方面 through in water property coating material production formulation in add surface active property agent reduce surface force, improve/increase lubricating wet property can, 另一方面, in 进行工 parts front 处理时, for parts surface treatment quality requirements more high.

2, strong/high cold

water 蒸发潜 hot is 2457.22kJ/kg, commonly used solvent agent 蒸发潜 hot: 二甲苯 is 343.2kJ/kg, alcohol is 590.2kJ/kg, ketone type is 343～444kJ/kg, need ratio water low more, therefore spray coating thick degree coating film for parts drop temperature function water property coating material need more large 一. for/regarding machine 底盘, machine and other main/primary parts formed, coating anti is 主, for decoration requirements high parts, can strong/high cold.

3, 喷（底, 面）漆

spray coating water property coating material use generally gas and solvent agent type coating material same, for ring conditions （ main/primary is temperature, wet degree ） requirements and solvent agent type coating material versus ratio in 一定 差别. in 喷漆室 in spray coating water property coating material 时, water formed water gas 体积膨胀1244倍, can make 喷漆室 in wet degree rise high, wet degree to 90% above coating in by coating material upper coating film 会流淌 lower.

therefore, spray coating water property coating material control 喷漆室 wet degree very important, temperature degree need maintain in generate and scope/range, generally is, temperature degree in 15～30℃, versus for wet degree in 60～80% relatively is 适宜. if low 于15℃会 effect/influence formed film. due to water property ratio solvent agent large, 喷漆室 especially is ring water system most good using/adopting 不锈钢 made formed. 喷漆室 inner 送风必 must has 适当 调 temperature wet plant/unit.

4, preheating 期

preheating coating rear film and water 预蒸发 process, its is is anti has a large amount of water separation wet film （ water property color in water content is 63%）突然进入 relatively high temperature degree （＞100℃） 烘 dry 炉. preheating time and temperature degree specific parameters need according to use water property coating material property can, for parts coating quality requirements and dry requirements temperature degree 确定, generally lower temperature degree in 80℃ left right.

preheating time long short main/primary speed effect/influence. preheating time short, coating inner water separation has and 时挥发而导致经 high temperature rear 出现针孔, and other defect; preheating time long, film surface dry, easy generate and other defect. need combined selection preheating time, 否则容 easy 出现流挂, bubbles and other quality issues.

5, dry

同喷漆室 design similar, inner 壁也需 using/adopting 不锈钢 manufacturing. due to water 蒸发潜 hot large, is generally solvent agent 5-7倍, dry hot amount need degree increase large. meanwhile, water relatively has machine solvent agent slow, make water property coating material dry time need long, coating film and by coating material rise temperature fast. in water property coating material in remove use electrical coating method coating film, electrical function make wet coating film in water amount very less, can 直接经受 high temperature outer, its it water amount relatively high water property coating material coating film need preheating rear can rise process temperature degree.

6, 输调漆 system

solvent agent type coating material 输调漆 system can using/adopting carbon made formed, water property coating material due to water make metal 生锈而腐蚀, therefore water property coating material 输调漆 system must use 不锈钢材 material, 并应经 chemical 钝化处理, another also need has for water property coating material high property to use soft tube/pipe and has 足够处理 can force 泵.

7, electrical spray coating equipment

and solvent agent type coating material versus ratio, water property coating material electrical retardant relatively small, if use 传统 静 electrical add methods 会导致漏 electrical, need using/adopting specialized electrical spray coating equipment. usually water property coating material using/adopting 直接（ internal ） belt/tape electrical methods and 间接（ external ） belt/tape electrical methods coating 装.