Shanghai Daoqin Plastics Co., Ltd.

defoamer 也叫消沫 agent, resistant agent, defoamer 实际就 is remove foam 意思, it is types tool has relatively low surface force and relatively high surface active property, can made or remove system in foam material 质. in industrial production process in generate very more has foam, heavy retardant production degree, this need add defoamer remove this has foam.

main/primary suitable for sheet/plate (PCB) process/workflow; chemical industry; electroplating;印染;造纸;医药; water property ink;陶瓷 separation 切;钢 sheet/plate 清洗; aluminum processing; various water 处理以 and various industrial and other water system 方面 消泡 and 抑泡.

defoamer reaction mechanism

foam local surface force reduce foam 破灭

has in system in research poly silicon oxygen 烷 消泡 process,他们 for foam system 以1/1000秒 speed degree 连续拍照,照 sheet/slice large 100倍,连续拍摄 4幅照 sheet/slice 示意图 can 见, silicon defoamer small to film upper, make film surface 破裂并 combined formed large 泡, from 1~3, foam 由4 combined formed 1 large,泡 film thin. most rear gas liquid speed separation 离, large 泡消灭, to 4则破泡结束. this from upper understanding 释, is what defoamer lower,一连串 bubbles causes.

当 defoamer to film upper 即浸入泡 film liquid,会 significantly reduce surface force. is in water system in, defoamer active property formed separation for water solvent understanding degree relatively small, surface force reduce 仅限于泡 film local,而泡 film surface force 几乎没 has 发生变化. surface force reduce separation, by strong/high toward 四周牵引, 延展, most rear foam 破裂.

defoamer can bad film elastic property 而导致 bubbles 破灭

due to film surface surface active property agent, make surface force reduce. therefore in to local pressure,泡 film in local thin meanwhile,该处会因 surface active property agent dilute thin 而导致 surface force rise high. positive is is new surface and surface between has surface force 之差, make film outer impact thin 时, generate elastic property force,泡 film 才 以不破,起 to function. if 我们设 method bad this type of elastic property,就 can bad foam stability property. has expert is: defoamer function is bad film elastic property. defoamer add to foam system in,会 toward gas liquid interface expand dispersion, make tool has function surface active property agent difficult 以发生恢复 film elastic property can force.

defoamer can make liquid film liquid, 因而导致 bubbles 破灭

添 add accelerated film liquid material 质(defoamer), can 消泡. if film thick,排 liquid to 30~40nm 历程就 long, but also,泡 film 自愈效应 relatively strong/high,泡 film elastic property good, therefore film thick foam lifespan long,泡 film liquid speed rate can foam stability property. liquid film liquid speed rate fast, make liquid film thin, thin to 一定 程 degree foam 就破灭.

添 add hydrophobic water solid pellets can bubbles 破灭

in water system in, mono add hydrophobic water oxidation silicon (即 hydrophobic water 白炭黑) pellets,即 has function. hydrophobic water 白炭黑 pellets in bubbles surface 会吸引 surface active property agent hydrophobic water 端, hydrophobic water pellets is hydrophilic water pellets 而进入 water versus,完 formed function. hydrophobic water oxidation silicon solid pellets generally is use silicon 油, silicon nitrogen or DMC处理 白炭黑 pellets, it in bubbles surface local 浸入, make bubbles local surface force small, again add upper solid pellets function,像针尖插入 bubbles, accelerated bubbles 破灭. therefore generally has hydrophobic water 白炭黑 defoamer 破泡效果 need good 一.

increase solvent surface active property agent can bubbles 破灭

certain can and solvent liquid separation mixed combined low separation material 质, can make bubbles surface active property agent by increase solvent, make its has concentrated degree reduce. has this type of function low separation material 质如辛 alcohol, alcohol, alcohol and other alcohol type, not only can decrease/reduce surface surface active property agent concentrated degree, but also also solvent surface active property agent 吸附层, reduce surface active property agent separation 子间 紧密程 degree, from decrease low foam stability property.

electrical understanding understanding surface active property agent di electrical make bubbles 破灭

for/regarding foam surface active property agent di electrical versus function, generate stability property liquid, add 入普通 electrical understanding can understanding surface active property agent di electrical 层起消泡 function.

defoamer formed

active property formed 份

function: 破泡, 消泡, decrease small surface force:

代 table/sheet material: silicon 油, polyether type, high grade alcohol, material 油, material and other.

emulsification agent

function: make active property formed separation dispersion formed small pellets, dispersion in water in, more good to 消泡, 抑泡效果.

代 table/sheet material: 壬（辛）基酚 poly oxygen ethylene ether, salt, op series and other, temperature series, series and other.

载体

function: has 助于载体 and system combined, easy dispersion to system 里, 两者结 combined 起, its surface force low, has 助于抑泡, can reduce cost.

代 table/sheet material: remove water outer solvent agent, 如脂肪烃, 芳香烃, oxygen solvent agent and other

emulsification additives

function: make emulsification more good.

代 table/sheet material: dispersant （ hydrophobic water oxidation silicon and other ）; increase viscous agent: （CMC, polyethylene (PE) ether and other ）.

how to selection defoamer

in liquid in solvent or difficult solvent

is foam, defoamer in film upper concentrated shrink, in. for agent 情况, in concentrated shrink, in, for/regarding 抑泡 情况应经常 maintain in this type of 状态. therefore defoamer in liquid in is saturated and 状态, has solvent or difficult solvent easy to saturated and 状态. solvent or difficult solvent, easy poly in gas liquid interface, easy concentrated shrink in film upper, can in relatively low concentrated degree lower function. used for water system defoamer, active property formed separation separation 子, must is strong/high hydrophobic water low hydrophilic water, HLB value in 1.5-3 scope/range, function 才.

surface force low 于起泡 liquid

has defoamer separation function force small, surface force low 于起泡 liquid, defoamer micro can in film upper and expand 展. value attention/notes is, liquid surface force non solvent liquid surface force, is solvent liquid surface force.

and liquid has 一定程 degree hydrophilic and property

due to process upper is foam speed degree and foam formed speed degree competition, therefore defoamer must can in liquid in fast speed dispersion, 以便迅 speed in liquid in relatively scope/range inner function. need make defoamer expand dispersion relatively fast, defoamer active property formed separation must and liquid tool has 一定程 degree hydrophilic and property. defoamer active property formed separation and liquid hydrophilic, solvent understanding; hydrophobic also difficult dispersion. has hydrophilic hydrophobic 适宜, force good.

and liquid 不发生 chemical reaction

defoamer and liquid reaction, 一方面 defoamer 会丧失 function, 另一方面 can can generate has material 质, effect/influence micro material long.

挥发 property small, function time long

首先 need need use defoamer system, is water property system or property system. 如发酵 industry, need use property defoamer, polyether modified silicon or polyether type. water property coating material industry need use water property defoamer, has machine silicon defoamer. selection defoamer, comparison add amount, in price, can most suitable most defoamer product.