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影响粉末静电喷涂的主要因素

发布时间:2014.07.29    点击数: 164385

粉末静电喷涂工艺中影响涂膜性能的因素除喷涂工艺参数外,还与粉末涂料特性有关。

 

(1)粉末粒度
粉末粒度对涂覆工艺性能的影响见表1。

 

(2)粉末电导率
粉末涂料的体积电阻对其施工性能有较大影响,详见表2。

 

表1 粉末粒度对涂覆工艺的影响
涂覆工艺 粒度的变化
对工艺的影响(由大变小)

粉末流动性
涂覆性
被吹散倾向
喷枪的堵塞

膜 厚

逐渐变差
从难到易
从难到易飞
流畅到易堵塞

从厚到薄
表2 粉末涂料体积电阻对施工性能的影响
体积电阻/Ω·cm 施工性能
109以下 易放出带电电荷、粉末粒子易脱落

1010~1014

施工性能好,在此范围内施工可得厚涂膜

1015以上 粒子电荷不易放出、工件表面积累电荷、不能得厚涂膜
 

 

从表2看出:静电喷涂施工中要求粉末粒子的体积电阻值应为1010 ~ 1014Ω·cm为好。

 

(3)喷涂距离
喷涂距离的变化使电场强度产生变化,从而也影响涂膜厚度和粉末的沉积效率。
喷涂距离与沉积效率的关系见表3.
从表3看出,喷涂距离为250mm时,沉积效率最高。

 

(4)喷涂电压
喷涂电压增大,粉末附着量增加,但超过90kV时,附着量的增加率变小,电压增大时膜厚的初始增长率增加,但随着喷涂时间的增长,电压对涂膜厚度增加影响减少。喷涂距离增大,电压对膜厚的影响减小。喷涂电压过高,会使粉末击穿,影响粉末质量。一般喷涂电压控制在60 ~ 90kV内。

 

(5)供气压力
供粉器的供气压力增大,沉积效率下降。其关系见表4

 

表3 喷涂距离与沉积效率的关系
喷涂距离/mm 沉积效率(%) 沉积效率(%)

250
300

400

100
91

56

喷粉量:60g/min
喷涂时间:20s

喷涂电压:90kV
表4 供气压力与沉积效率的关系
供气/Pa 沉积效率(%) 沉积效率(%)

4.9
6.89
9.8
14.7

19.6

100
97
94
88

84

喷涂距离:250mm
喷粉量:60g/min
喷涂时间:20s
喷涂电压:90kV

环氧粉末
 
        关于QY千亿国际智能 About Liangshi InteRobot:
        上海QY千亿国际智能科技股份有限公司(股票代码:837430 厚积薄发 持续创新),为全球客户提供智能制造和表面处理系统解决方案,从业30多年,是一个集研发、设计、制造、工程安装、工程咨询于一体的专业化制造及自动化智能控制系统集成公司,能为客户解决:
        Shanghai Liangshi InteRobot Technology Corporation (Stock Code: 837430 Accumulate richly and break forth vastly; innovate continuously) provides surface treatment sandblasting system solution for global customers. By engaging in this industry for more than twenty years, we're a professional manufacturing and automatic intelligent control system corporation, which integrates researching, designing, manufacturing, project installation and project consulting. We can provide our customers with:
        1、化学表面处理喷抛丸、喷丸强化设备、热喷涂和涂装设备工艺系统解决方案和工艺装备;
              We provide process system solution and process equipments of surface treatment sandblasting shot blasting, shot peening, enameling, thermal spraying, coating equipment.
        2、智能制造自动化机器人应用工艺系统解决方案和工艺装备;
              We provide professional system solution and process equipments of automation and robot technology application.
        3、食品乳品、制药、生物、制冷、石油化工、船舶制造、能源、造纸、纺织系统领域承压系统集成整体解决方案;
              We provide professional integrated solution for pressure bearing system in fields of food dairy, biopharmaceutical, refrigerating, petrochemical, marine engineering, energy, paper-making, fabrics, etc.
        4、涂装环保设备:VOC废气、废水、粉尘处理和噪音治理系统工艺解决方案和工艺装备。
              We provide environment protection blasting and painting equipment: process solution and equipment of VOCs waste gas, waste water, dust, noise treatment system.
         5、专业提供压力容器设计制造:为食品乳品、生物制药、水处理、制冷、石油化工、船舶海工、电力能源、造纸纺织、有色金属等领域提供承压系统集成整体解决方案。
              Professionally provide the design and manufacture of pressure vessels: providing overall solutions for pressure system integration in the fields of food and dairy, biopharmaceutical, water treatment, refrigeration, petrochemical, shipbuilding and marine engineering, power and energy, paper and textile, non-ferrous metals and other fields.
        企业主导产品如下 The leading products of our company are as follows:
        主营业务:智能制造和表面处理工程系统集成的设计、研发、生产和销售。
        Main business: design, research, production and sales of surface treatment engineering system integration.
        六类主要产品:自动化涂装生产线、智能机器人喷涂系统、自动化喷抛丸生产线、智能机器人喷抛丸强化系统、自动化热喷涂系统、涂装节能环保设备。
        Six main product categories are: automatic painting production line, intelligent robot painting system, automatic shot/wheel blasting production line, intelligent robot shot peening system, automatic thermal spraying system, energy saving and environmental protection equipment for painting.
        产品主要应用于:新材料、新能源、工程机械、汽车制造、集装箱、船舶海洋工程、航空航天、港口桥梁、电子电气、环保工程、印刷造纸机械、医疗机械、纺织机械等领域。
        The products are mainly applied in: new materials, new energy, engineering machinery, automobile manufacturing, containers, marine engineering, aeronautics and astronautics, port bridges, electronic and electrical, environmental protection engineering, printing and papermaking machinery, medical machinery, textile machinery and so on.
        公司生产的表面工程系统集成具备智能、自动化的特点,可实现工业生产过程自动化控制,因而属于自动化装备。根据《高端装备制造业“十二五”规划》中对高端装备的定义“主要包括传统产业转型升级和战略性新兴产业发展所需的高技术高附加值装备”,公司产品属于高端装备,是为国民经济其他行业提供技术装备的战略性产业。
        The surface engineering system of our company integrates the characteristics of intelligence and automation, it can realize the automatic control of industrial production process, so it belongs to automatic equipment. According to the definition of premium-end equipment of 《The 125th programme of premium-end equipment manufacturing industry》, “it mainly includes the high technology and high value-added equipment required by traditional industrial transformation upgrading and the development of strategic new-emerging industries”. The company's products belong to the premium-end equipment, which is a strategic industry that provides technical equipment for the other industries of the national economy.
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