CN103952244A - Water-based cleaning agent capable of reducing discharge of pollutants produced in circuit board cleaning - Google Patents
Water-based cleaning agent capable of reducing discharge of pollutants produced in circuit board cleaning Download PDFInfo
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- CN103952244A CN103952244A CN201410158283.2A CN201410158283A CN103952244A CN 103952244 A CN103952244 A CN 103952244A CN 201410158283 A CN201410158283 A CN 201410158283A CN 103952244 A CN103952244 A CN 103952244A
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Abstract
The invention relates to a water-based cleaning agent capable of reducing the discharge of pollutants produced in circuit board cleaning, which is characterized by being composed of the following raw materials: 30-50% of a compound solvent, 4-8% of a compound surfactant with a HLB value of 13-15, 0.1-0.5% of 2-ethylbenzimidazole and the balance of deionized water. The cleaning agent has the advantages and effects that the cleaning agent is easily available in raw materials, low in cost, and simple and practicable in preparation method; the discharge of organic matters in a cleaning process is greatly reduced; the cleaning agent is good in cleaning effect, especially has a good removal capacity on rosin flux residues on circuit boards subjected to welding.
Description
Technical field
The present invention relates to a kind of aqueous cleaning agent that reduces the discharge of wiring board clean contaminants, belong to field of electronic materials.
The invention still further relates to the preparation method of this aqueous cleaning agent.
Background technology
Pcb board has a large amount of organic pollutants and VOC discharge in cleaning process, and this is one of electronic welding Material Field primary pollution source.The decision and deployment of State Council during 12, using energy-saving and emission-reduction as adjusting economic structure, Economic Development Mode Conversion, important handgrip and the breach of pursuing development in a scientific way.At present pcb board clean-out system overwhelming majority is solvent-borne type, in cleaning process, produced a large amount of VOC with other organism exhaust emissions environment.Conventional pcb cleaning agent is mostly leaning solvent, and its main component is trieline, ethylene dichloride, fluorine ethylene dichloride, ethanol, methyl alcohol and a composition thereof.In cleaning, organic solvent in rinse bath can constantly evaporate in air, wiring board after cleaning in the process of seasoning above it remaining organism also to evaporate into completely in atmosphere, these discharges can cause serious atmospheric pollution, have damaged operation user's physical and mental health.
Object of the present invention provides a kind of aqueous cleaning agent that reduces the discharge of wiring board clean contaminants in order to overcome the shortcoming of prior art existence just with deficiency, thereby in wiring board cleans, reduce pollutant emission and environmental pollution, also avoid operator to endanger.
The present invention also provides the preparation method of this aqueous cleaning agent.
The object of the invention is to be achieved through the following technical solutions:
An aqueous cleaning agent that reduces the discharge of wiring board clean contaminants, it is comprised of the raw material of following weight per-cent:
Described complex solvent is that ethanol and Virahol are composite, and its composite weight ratio is 2～3:1;
The compound surfactant of described HLB=13～15 is that polyoxyethylene dehydration (or dehydration) sorbitan laurate, dehydration (or dehydration) sorbitan laurate of HLB=8 and the polyoxyethylene polyoxypropylene block polyether of HLB=12 of HLB=16.7 is composite, its composite weight ratio is 2～5.5:1～1.2:1～2, the hydrophilic and oleophilic value of HLB value representation tensio-active agent is the ratio of the water base group of interfacial activity agent molecule in-laws and lipophilic group.
A preparation method who reduces the aqueous cleaning agent of wiring board clean contaminants discharge, it carries out in the steps below:
(a) by ethanol and Virahol by weight the composite tank that is placed in of 2～3:1, stir standing 0.5 hour, prepare complex solvent;
(b) by dehydration (or dehydration) sorbitan laurate of the polyoxyethylene dehydration of HLB=16.7 (or dehydration) sorbitan laurate, HLB=8.6 and the polyoxyethylene polyoxypropylene block polyether of HLB=12, composite by weight 2～5.5:1～1.2:1～2 to be placed in another container composite, the compound surfactant of standing 1～1.5 hour preparation HLB=13～15 that stir;
(c) get again 30～50%(weight of (a) item, lower same) complex solvent, (b) deionized water of the compound surfactant of 4～8%HLB=13～15,0.1～0.5% 2-ethyl benzo imidazole and surplus adds in the reactor of sealing and stirs 1 hour with 3000 revs/min of speed, after standing 1 hour, filters and obtains product.
The complex solvent of raw material choose of the present invention be ethanol and Virahol by weight the composite advantage of giving full play to separately of 2～3:1, can improve stability, penetrating power and cleaning performance; Select the composite tensio-active agent in HLB=13～15, in HLB, H is that " Hydrophile " represents wetting ability, and L is that " Lipophilic " represents lipophilicity, and B is the meaning that " Balance " represents balance.The oleophylic of tensio-active agent or hydrophilicity can be differentiated by the size of HLB value, and HLB value is larger represents that wetting ability is stronger, and HLB value is less represents that lipophilicity is stronger, and generally speaking HLB value is between 1～40.HLB has important references to be worth in actual applications.Lipophilic surfactant HLB is lower, and hydrophilic surfactant active HLB is higher.The composite tensio-active agent of HLB=13～15, select polyoxyethylene dehydration (or dehydration) sorbitan laurate of HLB=16.7, another name polyoxyethylene sorbitan monolaurate, polyoxyethylene (20) sorbitol anhydride mono-laurate, English name TWEEN-20 is nonionogenic tenside; The dehydration of HLB=8.6 (or dehydration) sorbitan laurate, another name Arlacel-20, polyoxyethylene (20) sorbitol anhydride mono-laurate, English name Span20 is nonionogenic tenside; The polyoxyethylene polyoxypropylene block polyether of HLB=12, product designation (L44), Nanjing WeiEr chemical engineering Co., Ltd produces, structural formula: HO (CH
2cH
2o)
m(CH
3cHCH
2o)
n(CH
2cH
2o)
mh, molecular-weight average 2200POP molecular weight 1200POE molecular weight 40, proportion (25 ℃ of g/cm
3) 1.03, viscosity (25 ℃ of CPS) 400, flow point (℃)-4, cloud point (1% aqueous solution ℃) 65, surface tension (dynes/cm) 45.3, solubleness (%) 95% ethanol > 10%, water > 10%.
The HLB value of complexed surfactant has additivity. and the HLB value of composite tensio-active agent is calculated with following formula:
HLB
ABC=（HLB
A.W
A+HLB
B.W
B+HLB
C.W
C）/（W
A+W
B+W
C）
In formula:
HLB
aBC-be A, B, the C tensio-active agent HLB value after compound;
HLB
a,hLB
b,hLB
c-be respectively the HLB value of A and B and C;
W
a,w
b,w
cthe amount of-presentation surface promoting agent A, B and C.
Composite tensio-active agent of the present invention selects three kinds by weight 2～5.5:1～1.2:1～2 are composite, to form, composite HLB value can make clean-out system have the power of the wetting dispersion of emulsification and decontamination at 13～15 tensio-active agents, and foam is few in cleaning process, is conducive to streamline operration and carries out smoothly.
The 2-ethyl benzo imidazole of selecting, English name 2-Ethyl-1H-benzimidazole, is anticorrosive agent.
Clean-out system of the present invention has good removal ability to the rosin flux residue of postwelding on wiring board, clean-out system has the powerful effect of the wetting dispersion of emulsification and decontamination, and in cleaning process, foam is few, being conducive to streamline operration carries out smoothly, due to the deionized water having in clean-out system more than 50%, distillation emission gases is mainly water vapour, is the good clean-out system of the anti-coating pre-treatment of wiring board three.Tin welding spot after cleaning and the nondiscoloration of gold and silver contact, the clean-out system of using is reusable after adjusting processing.
Owing to taking technique scheme that technology tool of the present invention is had the following advantages and effect:
(a) raw material is easy to get, and cost is low, and preparation method is simple, and available stoste is rinsed well with clear water after soaking and scrubbing again, or is made into ultrasonic vibration cleaning and spray cleaning for 20% concentration liquid.
(b) in cleaning, organism discharge greatly reduces, cleaning performance is good, especially the rosin flux residue of postwelding on wiring board is had to good removal ability, it is the good clean-out system of the anti-coating pre-treatment of wiring board three, tin welding spot after cleaning and the nondiscoloration of gold and silver contact, the clean-out system of using is reusable after adjusting processing.
Embodiment
Embodiment 1
Get polyoxyethylene dehydration (or dehydration) sorbitan laurate of HLB=16.7, the polyoxyethylene polyoxypropylene block polyether of the dehydration of HLB=8.6 (or dehydration) sorbitan laurate and HLB=12 is composite by weight 3:1:1, calculates composite tensio-active agent HLB=(16.7 * 3+8.6 * 1+12 * 1)/(3+1+1)=14.14;
By ethanol and Virahol by weight 3:1 than the composite tank that is placed in, stir and within standing 0.5 hour, prepare complex solvent, again by the polyoxyethylene dehydration of HLB=16.7 (or dehydration) sorbitan laurate, the polyoxyethylene polyoxypropylene block polyether of the dehydration of HLB=8.6 (or dehydration) sorbitan laurate and HLB=12 is by weight composite another container that is placed in of 3:1:1, stir and within standing 1 hour, prepare the composite tensio-active agent of HLB=14.14, get 30g complex solvent, the tensio-active agent that 4g is composite, the 2-ethyl benzo imidazole of 0.2g and the deionized water of 65.8g, add in the reactor of sealing and stir 1 hour with 3000 revs/min of speed, after standing 1 hour, filter and obtain product.
Embodiment 2
Get polyoxyethylene dehydration (or dehydration) sorbitan laurate of HLB=16.7, the polyoxyethylene polyoxypropylene block polyether of the dehydration of HLB=8.6 (or dehydration) sorbitan laurate and HLB=12 is composite by weight 2:1.2:2, calculates composite tensio-active agent HLB=(16.7 * 2+8.6 * 1.2+12 * 2)/(2+1.2+2)=13;
By ethanol and Virahol by weight 2.5:1 than the composite tank that is placed in, stir and within standing 0.5 hour, prepare complex solvent; By the polyoxyethylene dehydration of HLB=16.7 (or dehydration) sorbitan laurate, the polyoxyethylene polyoxypropylene block polyether of the dehydration of HLB=8.6 (or dehydration) sorbitan laurate and HLB=12 is by weight composite another container standing 1.5 hours composite tensio-active agents of preparation HLB=13 that stir that are placed in of 2:1.2:2, get 35g complex solvent, the composite tensio-active agent of 8g, the 2-ethyl benzo imidazole of 0.4g and the deionized water of 56.6g, add in the reactor of sealing and stir 1 hour with 3000 revs/min of speed, after standing 1 hour, filter and obtain product.
Embodiment 3
Get polyoxyethylene dehydration (or dehydration) sorbitan laurate of HLB=16.7, the polyoxyethylene polyoxypropylene block polyether of the dehydration of HLB=8.6 (or dehydration) sorbitan laurate and HLB=12 is composite by weight 5.5:1:1, calculates composite tensio-active agent HLB=(16.7 * 5.5+8.6 * 1+12 * 1)/(5.5+1+1)=15;
By ethanol and Virahol by weight 2:1 than the composite tank that is placed in, stir and within standing 0.5 hour, prepare complex solvent, again by the polyoxyethylene sorbitan monolaurate of HLB=16.7, the polyoxyethylene polyoxypropylene block polyether of the dehydration of HLB=8.6 (or dehydration) sorbitan laurate and HLB=12 is by weight composite another container standing 1.5 hours composite tensio-active agents of preparation HLB=15 that stir that are placed in of 5.5:1:1, get 50g complex solvent, the tensio-active agent that 6g is composite, the 2-ethyl benzo imidazole of 0.1g and the deionized water of 43.9g, add in the reactor of sealing and stir 1 hour with 3000 revs/min of speed, after standing 1 hour, filter and obtain product.
Embodiment 4
Get the 40g complex solvent of embodiment 1 preparation and the composite tensio-active agent of 5g of embodiment 2, get again the 2-ethyl benzo imidazole of 0.3g and the deionized water of 54.7g, add in the reactor of sealing and stir 1 hour with 3000 revs/min of speed, after standing 1 hour, filter and obtain product.
Embodiment 5
Get embodiment 1 preparation 45g complex solvent and and the composite tensio-active agent of 7g of embodiment 3, get again the 2-ethyl benzo imidazole of 0.5g and the deionized water of 47.5g, add in the reactor of sealing and stir 1 hour with 3000 revs/min of speed, after standing 1 hour, filter and obtain product.
Claims (2)
1. the aqueous cleaning agent that can reduce the discharge of wiring board clean contaminants, is characterized in that it is comprised of the raw material of following weight per-cent:
Described complex solvent is that ethanol and Virahol are composite, and its composite weight ratio is 2～3:1;
The compound surfactant of described HLB=13～15 is that polyoxyethylene dehydration (or dehydration) sorbitan laurate, dehydration (or dehydration) sorbitan laurate of HLB=8 and the polyoxyethylene polyoxypropylene block polyether of HLB=12 of HLB=16.7 is composite, its composite weight ratio is 2～5.5:1～1.2:1～2, the hydrophilic and oleophilic value of HLB value representation tensio-active agent is the ratio of the water base group of interfacial activity agent molecule in-laws and lipophilic group.
2. a kind of preparation method who reduces the aqueous cleaning agent of wiring board clean contaminants discharge according to claim 1, is characterized in that it carries out in the steps below:
(a) by ethanol and Virahol by weight the composite tank that is placed in of 2～3:1, stir standing 0.5 hour, prepare complex solvent;
(b) by dehydration (or dehydration) sorbitan laurate of the polyoxyethylene dehydration of HLB=16.7 (or dehydration) sorbitan laurate, HLB=8.6 and the polyoxyethylene polyoxypropylene block polyether of HLB=12, composite by weight 2～5.5:1～1.2:1～2 to be placed in another container composite, the compound surfactant of standing 1～1.5 hour preparation HLB=13～15 that stir;
(c) get again 30～50%(weight of (a) item, lower same) complex solvent, (b) deionized water of the compound surfactant of 4～8%HLB=13～15,0.1～0.5% 2-ethyl benzo imidazole and surplus adds in the reactor of sealing and stirs 1 hour with 3000 revs/min of speed, after standing 1 hour, filters and obtains product.
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| CN201410158283.2A CN103952244B (en) | 2014-04-18 | 2014-04-18 | A kind of aqueous cleaning agent for reducing wiring board cleaning pollutant emission |
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|---|---|---|---|
| CN201410158283.2A CN103952244B (en) | 2014-04-18 | 2014-04-18 | A kind of aqueous cleaning agent for reducing wiring board cleaning pollutant emission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106085247A (en) * | 2016-06-12 | 2016-11-09 | 东莞理工学院 | A kind of antistatic automobile buffing wax cleaned with glazing one and preparation method thereof |
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2014
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101444208A (en) * | 2008-11-06 | 2009-06-03 | 张少武 | Kresoxim-methyl sterilizing aqueous emulsion and preparation method thereof |
| CN101796947A (en) * | 2010-04-15 | 2010-08-11 | 青岛星牌作物科学有限公司 | Pesticide emulsion in water and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106085247A (en) * | 2016-06-12 | 2016-11-09 | 东莞理工学院 | A kind of antistatic automobile buffing wax cleaned with glazing one and preparation method thereof |
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