JP5448625B2 - Cleaning method and apparatus without rinsing process - Google Patents

Description

  The present invention eliminates all kinds of dirt such as processing oils, greases, waxes used in the machining of mechanical parts, precision machine parts, optical machine parts, etc. The present invention relates to a cleaning method and a cleaning apparatus suitable for cleaning.

  When processing machine parts, precision machine parts, optical machine parts, etc., various processing oils such as cutting oil, press oil, drawing oil, heat treatment oil, rust preventive oil, lubricating oil, greases or waxes are used. However, these soils need to be finally removed, and removal by a solvent is generally performed.

  Soldering is the most commonly used method for joining electronic circuits, but rosin is used for the purpose of removing and cleaning oxides on the metal surface to be soldered, preventing reoxidation, and improving solder wettability. In general, the soldering surface is pre-treated with a flux containing as a main component. Since this flux residue causes corrosion of the metal and deterioration of insulation, it is necessary to remove it sufficiently after the soldering is completed.

  These washing and removal have many characteristics such as nonflammability, low toxicity and excellent solubility, so that 1,1,2-trichloro-1,2,2-trifluoroethane (hereinafter referred to as “removable”) CFC113) or a mixture of CFC113 and alcohol was used for cleaning, but global environmental pollution problems such as ozone depletion were pointed out, and production was abolished in Japan at the end of 1995. As an alternative to the CFC 113, a mixture of 3,3-dichloro-1,1,1,2,2-pentafluoropropane and 1,3-dichloro-1,1,2,2,3-pentafluoropropane (hereinafter referred to as “CFC 113”) Hydrochlorofluorocarbons (such as HCFC225) have been proposed, but these are also expected to be banned in Japan in 2020 due to their ability to destroy the ozone layer.

  Further, in recent years, non-flammable fluorine-based solvents having no ozone layer destructive ability such as hydrofluorocarbons (hereinafter referred to as HFC) and hydrofluoroethers (hereinafter referred to as HFE) containing no chlorine atom have been proposed. Since it does not contain chlorine atoms, its solubility is low and it cannot be used alone as a cleaning agent.

Patent Document 1, Patent Document 2, and the like disclose a mixed solvent of a non-chlorine fluorine compound such as HFC or HFE and a compound that satisfies a specific condition for the purpose of improving detergency against dirt. Although these problems are solved by these inventions and a non-flammable detergent composition having no ozone destructive ability and excellent dissolving ability is obtained, rinsing with HFC or HFE having excellent volatility after the washing process A process is required, which is an issue when saving space.
As alternative cleaning agents, non-aqueous cleaning agents using hydrocarbon solvents or alcohol solvents in addition to halogen solvents, and aqueous cleaning agents containing acids, alkalis or surfactants are being developed. However, there is a problem such as an increase in the size of the apparatus, and it has not been solved sufficiently.

JP 10-36894 A Japanese Patent Laid-Open No. 10-192797

  The present invention contains a high-boiling solvent that exhibits detergency comparable to that of HCFC225 against all types of soils, has low toxicity, low flammability, and excellent detergency without any risk of ozone layer destruction. A cleaning method and a cleaning apparatus that use a cleaning agent to prevent deterioration in cleaning properties due to re-adhesion of dirt on the surface of an object to be cleaned, and eliminate the need for a rinsing process using HFC or HFE, which has excellent volatility. The issue is to provide.

As a result of repeated studies on the cleaning method and the cleaning apparatus for achieving the above-mentioned problems, the present inventor has found that the chlorine pressure at 20 ° C. having a different evaporation rate is 1.33 × 10 ³ Pa or more of a non-chlorine fluorine compound. (A) and a component (b) having a vapor pressure of less than 1.33 × 10 ³ Pa at 20 ° C. are used in combination at a constant composition ratio, and “cleaning bath temperature” and “cleaning” By stipulating the “temperature difference between the bath temperature and the steam zone temperature”, the cleaning method without the rinse step using the condensate obtained by heating the cleaning agent can provide the same cleaning and drying properties as HCFC225. I found.

Specifically, a non-chlorine fluorine compound (a) having a vapor pressure at 20 ° C. of 1.33 × 10 ³ Pa or more is 80 to 95% by weight, and a component having a vapor pressure at 20 ° C. of less than 1.33 × 10 ³ Pa. (B) In a step of cleaning an article to be steam cleaned with steam obtained by heating the cleaning agent after cleaning with a cleaning agent containing 5 to 20% by weight, the cleaning tank temperature is 25 to 45 ° C. By washing under a washing condition in which the temperature difference between the bath temperature and the steam zone temperature is 10 to 40 ° C., in a washing method without a rinsing step, not only a washing performance equivalent to that of HCFC225 is obtained, but also an excellent drying property As a result, the present invention was completed.
Aspects of the present invention are as described below.

In the first aspect of the present invention, (a) a non-chlorine fluorine compound having a vapor pressure at 20 ° C. of 1.33 × 10 ³ Pa or more is 80 to 95% by weight, and (b) the vapor pressure at 20 ° C. is 1. Including a step of cleaning in a cleaning tank with a cleaning agent containing 5 to 20% by weight of a component less than 33 × 10 ³ Pa, and a step of cleaning with steam obtained by heating the cleaning agent. In the cleaning method that does not include the step of rinsing the cleaning agent adhering to the cleaning tank, the temperature of the cleaning tank is 25 to 45 ° C., and the difference between the temperature of the cleaning tank and the temperature of the zone that is cleaned with steam is 10 to 40 ° C. A cleaning method characterized by the above.

  A second aspect of the present invention is the cleaning method according to the first aspect, wherein the component (a) contains hydrofluorocarbon (HFC) and / or hydrofluoroether (HFE).

  In a third embodiment of the present invention, the component (a) is 2H, 2H, 4H, 4H, 4H-pentafluorobutane (HFC365mfc), 2H, 3H-perfluoropentane (HFC43-10mee), methyl perfluorobutyl ether, Methyl perfluoroisobutyl ether and mixtures thereof, ethyl perfluorobutyl ether, ethyl perfluoroisobutyl ether and mixtures thereof, 1,1,2,2-tetrafluoro-1- (2,2,2-trifluoroethoxy) ethane The cleaning method according to the first or second aspect, comprising one or a combination of two or more selected from (HFE347pc-f) and 4H, 5H, 5H-heptafluorocyclopentane.

  According to a fourth aspect of the present invention, the component (b) contains one or more compounds selected from the group consisting of glycol ethers, glycol ether acetates, esters and hydrocarbons. It is a washing | cleaning method as described in any one aspect of -3.

  According to a fifth aspect of the present invention, there is provided a cleaning tank for cleaning an object to be cleaned with a cleaning agent, a mechanism for adjusting a cleaning agent temperature in the cleaning tank, and a vapor of at least one component constituting the cleaning agent. A heating tank having a heating mechanism for making the steam, a steam zone for steam cleaning with steam generated from the heating tank, a water separation tank for removing moisture from the condensate obtained by condensing the generated steam, A mechanism for circulating the cleaning agent between the cleaning tank and the heating tank, and any one of the first to fourth aspects having no mechanism for rinsing the cleaning agent attached to the object to be cleaned This is a cleaning device used in the cleaning method.

The present invention relates to a non-chlorine fluorine compound (a) having a vapor pressure at 20 ° C. of 1.33 × 10 ³ Pa or more, 80 to 95% by weight, and a component having a vapor pressure at 20 ° C. of less than 1.33 × 10 ³ Pa. (B) After washing with a cleaning agent containing 5 to 20% by weight, the temperature of the cleaning tank is controlled to 25 to 45 ° C. in the step of cleaning an article to be steam cleaned with steam obtained by heating the cleaning agent. The vapor pressure at 20 ° C. is 1.33 × 10 5 by combining the excellent soil solubility of component (b) with the temperature effect that the solubility of component (a) in the soil component is remarkably improved by increasing the liquid temperature. It is possible to maintain excellent soil solubility while suppressing the addition concentration of the component (b) which is difficult to dry at less than ³ Pa, and by suppressing the addition concentration of the component (b), the washing tank temperature And steam zone By controlling the temperature difference from 10 degrees to 10 degrees Celsius, it is possible to steam clean the component (b) consisting solely of the condensate condensed on the surface of the object to be cleaned in the steam zone and the dirt component dissolved in the cleaning agent. Thus, even in a cleaning method without a rinsing step, it was possible to perform cleaning with the same cleaning performance as HCFC225 and excellent drying properties.

It is an example of the washing | cleaning apparatus as described in aspect (5) of this invention.

The present invention will be specifically described below.
First, terms used in this specification will be described.
In this specification, “cleaning” refers to removing dirt adhering to an object to be cleaned to a level that does not affect the next process. “Rinse” is to replace a cleaning agent containing a dirt component adhering to an object to be cleaned with a solvent containing no dirt component after washing. The vapor cleaning is to remove a slightly contaminated component remaining on the surface of the object to be cleaned with a liquid that condenses on the surface of the object to be cleaned due to a temperature difference between the object to be cleaned and the steam. The “dirt component” represents a component that is desired to be removed from the object to be cleaned. For example, processing oil adhering to precision parts, flux residue adhering to the printed circuit board, liquid crystal remaining between the gaps of the liquid crystal cell, and the like can be mentioned.

The cleaning method in the present invention is a condensate of steam obtained by heating the cleaning agent as a cleaning step and a subsequent step using a cleaning agent containing the component (a) having a high vapor pressure and the component (b) having a low vapor pressure. It consists of a steam cleaning process. The performance required for the component (a) is that the vapor pressure is high in order to improve the drying property (the vapor pressure at 20 ° C. is 1.33 × 10 ³ Pa or more) and the vapor specific gravity is large in order to suppress the evaporation consumption. It is. The performance required for the component (b) is that the vapor pressure is low (the vapor pressure at 20 ° C. is less than 1.33 × 10 ³ Pa), and exhibits excellent dissolution performance for the component (a) and the soil component.

  The cleaning process essential for the cleaning method according to the present invention is a process for removing and cleaning the dirt components remaining in the object to be cleaned, and mainly cleaning with various cleaning agents stored in the cleaning tank, and ultrasonic waves as necessary. , A process including a mechanism for applying a physical force such as rocking or submerged jet.

  Specific cleaning steps include a cleaning tank for cleaning, a mechanism for adjusting the temperature of the cleaning agent in the cleaning agent tank, a heating tank or a distillation having a heating mechanism for generating steam by heating the cleaning agent. It consists of a tank and a water separation tank for removing moisture from the condensate obtained by condensing the generated steam. Vapor generated by heating by the heater of the heating tank or distillation tank is condensed by the cooling pipe, and the condensed liquid overflows in the order of the washing tank, heating tank or distillation tank after separating water in the water separation tank. If necessary, various mechanisms such as a pump for separating dirt components accumulated in the heating tank or the distillation tank, a filter, and a stationary tank using a difference in specific gravity can be installed.

  The essential condition in the washing step of the present invention is to control the washing tank temperature to 25 to 45 ° C, preferably 30 to 45 ° C or 25 to 40 ° C, more preferably 30 to 40 ° C. In this range, excellent detergency comparable to that of HCFC225 is obtained.

Further, the steam cleaning process essential to the cleaning method according to the present invention is a process of condensing a slight amount of dirt components remaining on the surface of the object to be cleaned on the surface of the object to be cleaned due to a temperature difference between the object to be cleaned and the steam. A cleaning method without a rinsing step in a step of cleaning with a cleaning agent containing a component (b) having a vapor pressure at 20 ° C. of less than 1.33 × 10 ³ Pa, which is difficult to dry in the step of cleaning with a liquid to be removed. This makes it possible to greatly improve the work efficiency at the cleaning site and to save space.

  The specific steam cleaning process includes a mechanism for steam cleaning that removes a slightly contaminated component remaining on the surface of the object to be cleaned with a liquid that condenses on the surface of the object to be cleaned due to a temperature difference between the object to be cleaned and the steam. It is a process.

  The essential condition in the steam cleaning step of the present invention is to control the temperature difference between the cleaning tank temperature and the steam zone temperature to 10 to 40 ° C, preferably 15 to 40 ° C or 10 to 30 ° C, more preferably 15 to 30 ° C. That is. A high steam cleaning can be obtained with a sufficient amount of condensate within this range, thereby enabling a cleaning method without a rinsing step.

Chlorine-fluorine compound vapor pressure at 20 ° C. using a washing agent used for the cleaning method is not less than 1.33 × ¹⁰ 3 Pa (a) of the present invention, the vapor pressure at 20 ° C. is 1.33 × ¹⁰ 3 Pa The type is not particularly limited as long as it is above, but, for example, a cyclic HFC specified by the following general formula (1), a chain HFC specified by the following general formula (2), or specified by the following general formula (3) Examples include HFE compounds containing no chlorine atom, consisting of carbon atoms, hydrogen atoms, oxygen atoms, fluorine atoms, and combinations of two or more compounds selected from these.

C _n H _2n-m F _m (1)
(In the formula, integers of 4 ≦ n ≦ 6, 5 ≦ m ≦ 2n−1 are shown)
C _x H _{2x + 2-y} F _y (2)
(In the formula, an integer of 4 ≦ x ≦ 6, 5 ≦ y ≦ 12 is shown)
C _s F _{2s + 1} OR (3)
(Wherein 4 ≦ s ≦ 6, R is an alkyl group having 1 to 3 carbon atoms)
Specific examples of the cyclic HFC include 3H, 4H, 4H-perfluorocyclobutane, 4H, 5H, 5H-perfluorocyclopentane (for example, Zeolora H (trade name)), 5H, 6H, 6H-perfluorocyclohexane, and the like. Can do. Specific examples of the chain HFC include 1H, 2H-perfluorobutane, 1H, 3H-perfluorobutane, 2H, 3H-perfluorobutane, 4H, 4H-perfluorobutane, 1H, 1H, 3H-perfluorobutane, 1H, 1H, 4H-perfluorobutane, 1H, 2H, 3H-perfluorobutane, 1H, 2H, 3H, 4H-perfluorobutane, 2H, 2H, 4H, 4H, 4H-perfluorobutane (HFC365mfc), 1H , 2H-perfluoropentane, 1H, 4H-perfluoropentane, 2H, 3H-perfluoropentane (HFC43-10mee), 2H, 4H-perfluoropentane, 2H, 5H-perfluoropentane, 1H, 2H, 3H- Perfluoropentane, 1H, 3H, 5H-perfluoropentane, 1H, H, 5H-perfluoropentane, 2H, 2H, 4H-perfluoropentane, 1H, 2H, 4H, 5H-perfluoropentane, 1H, 4H, 5H, 5H, 5H-perfluoropentane, 1H, 2H-perfluoro Examples include hexane, 2H, 3H-perfluorohexane, 2H, 4H-perfluorohexane, 2H, 5H-perfluorohexane, 3H, 4H-perfluorohexane, and the like. Specific examples of HFE include methyl perfluorobutyl ether, methyl perfluoroisobutyl ether and mixtures thereof (HFE7100), methyl perfluoropentyl ether, methyl perfluorocyclohexyl ether, ethyl perfluorobutyl ether, ethyl perfluoroisobutyl ether and mixtures thereof. (HFE7200), ethyl perfluoropentyl ether, 1,1,2,2-tetrafluoro-1- (2,2,2-trifluoroethoxy) ethane (HFE347pc-f), and the like.

  One or two or more compounds selected from these (a) non-chlorine fluorine compounds can be used in combination, preferably HFC or HFE having a low global warming potential. More preferably, HFC365mfc, 4H, 5H, 5H-perfluorocyclopentane (for example, Zeolora H (trade name)), methyl perfluorobutyl ether and methyl perfluoroisobutyl ether and HFE7100, ethyl perfluorobutyl ether and ethyl perfluoroisobutyl ether and HFE7200, HFE347pc-f can be mentioned. More preferably, mention may be made of methyl perfluorobutyl ether, methyl perfluoroisobutyl ether, HFE7100, and HFC365mfc having a soil dissolving ability suitable as a cleaning agent, which are excellent in flash point suppression effect. In particular, in order to make the cleaning agent non-flammable, it is necessary to contain a non-chlorine fluorine compound as component (a).

In the cleaning agent of the present invention, the vapor pressure at 20 ° C. is 1.33 × 10 ³ Pa for the purpose of improving detergency and rinsing performance against all kinds of dirt such as processing oils, greases, waxes and fluxes. It is necessary to use one or a combination of two or more compounds (b) selected from less than components. For example, various hydrocarbons, alcohols, ketones, and organic compounds having an ether bond and / or an ester bond, etc. have a good detergency against various stains, and the vapor pressure at 20 ° C. is 1. It is a compound of less than 33 × 10 ³ Pa. When the vapor pressure of the component (b) is within this range, a cleaning agent having excellent cleaning properties according to the present invention can be obtained. Preferably, it is 6.66 × 10 ² Pa or less at 20 ° C., and more preferably 1.33 × 10 ² Pa or less. Hereinafter, component (b) is illustrated for every kind of solvent.

Specific examples of hydrocarbons include decane, undecane, dodecane, tridecane, tetradecane, pentadecane, menthane, bicyclohexyl, cyclododecane, 2,2,4,4,6,8,8-heptamethylnonane, and the like. Specific examples of alcohols include n-butanol, isobutanol, sec-butanol, isoamyl alcohol, n-heptanol, n-octanol, n-nonanol, n-decanol, n-undecanol, benzyl alcohol, furfuryl alcohol, ethylene glycol Propylene glycol and the like, and specific examples of ketones include methyl-n-amyl ketone, diisobutyl ketone, diacetone alcohol, phorone, isophorone, cyclohexanone, acetophenone, and the like. An organic compound having an ether bond is a compound containing at least one ether bond (C—O—C) in the molecular structure, and an organic compound having an ester bond is an ester bond in the molecular structure. It is a compound containing at least one (—COO—). Specific examples of the compound having an ether bond include ethylene glycol mono-n-hexyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono-i-propyl ether, diethylene glycol mono-n. -Butyl ether, diethylene glycol mono-i-butyl ether, propylene glycol monomethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-i-propyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-i-butyl ether, di Propylene glycol monomethyl ether, dipropylene glycol mono-n- Propyl ether, dipropylene glycol mono-i-propyl ether, dipropylene glycol mono-n-butyl ether, dipropylene glycol mono-i-butyl ether, tripropylene glycol monomethyl ether, 3-methoxybutanol, 3-methyl-3-methoxybutanol, Examples include diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol di-n-butyl ether, and dipropylene glycol dimethyl ether. Compounds having an ester bond include: n-butyl acetate, isoamyl acetate, 2-ethylhexyl acetate, methyl acetoacetate, ethyl acetoacetate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, γ-butyllactone, dimethyl succinate Dimethyl glutarate, dimethyl adipate, diethylene glycol monobutyl ether acetate, dipropylene glycol monomethyl ether acetate, dipropylene glycol monobutyl ether acetate, 3-methyl-3-methoxybutyl acetate and the like.
The proportion of component (a) in the cleaning agent is 80 to 95% by weight, preferably 80 to 90% by weight, and the proportion of component (b) is 5 to 20% by weight, preferably 10 to 20% by weight. In this range, sufficient cleaning properties, drying properties and non-flammability can be obtained.

  In the cleaning agent of the present invention, various auxiliary agents such as surfactants, stabilizers, antifoaming agents, ultraviolet absorbers and the like may be added as necessary as long as the effects of the present application are not impaired. good.

  Specific examples of additives that can be added to the cleaning agent of the present invention are shown below.

  As the surfactant, an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant may be added. Examples of the anionic surfactant include fatty acids having 6 to 20 carbon atoms, alkali metals such as dodecylbenzenesulfonic acid, alkanolamines and amine salts. Examples of the cationic surfactant include quaternary ammonium salts. Examples of nonionic surfactants include alkylphenols, ethylene oxide adducts of linear or branched aliphatic alcohols having 8 to 18 carbon atoms, and block polymers of polyethylene oxide polypropylene oxide. Examples of amphoteric surfactants include betaine type and amino acid type.

  Stabilizers for inhibiting metal corrosion, rusting and discoloration include nitroalkanes such as nitromethane and nitroethane, epoxides such as 1,2-butylene oxide, ethers such as 1,4-dioxane, and triethanolamine And the like, 1,2,3-benzotriazoles and the like.

  Examples of the antifoaming agent include self-emulsifying silicone, silicon, fatty acid, higher alcohol, polypropylene glycol polyethylene glycol, and fluorine-based surfactant.

  The cleaning process can be effectively cleaned by combining physical methods such as immersion, rocking, vibration, submerged jet, and ultrasonic waves for the purpose of improving the cleaning performance. In the steam cleaning process, the steam generated in the heating tank having a heating mechanism for generating the steam of the cleaning agent is continuously separated from the soil component by circulating while changing the state into a liquid or gas in the cleaning device, Steam cleaning with a highly clean condensate is possible in the steam zone.

  The cleaning method of the present invention can be said to be an excellent cleaning method without a rinsing step by removing the dirt component on the surface of the object to be cleaned with the cleaning agent and steam cleaning with a condensate obtained by heating the cleaning agent in the subsequent step.

A specific cleaning method and cleaning apparatus will be described with reference to the accompanying drawings.
In the cleaning device of the present invention, the component (a) having a high vapor pressure contained in the cleaning agent and the component (b) slightly contained in the cleaning agent are circulated while changing the state into a liquid or gas in the cleaning device, thereby It is possible to perform a steam cleaning of a slightly contaminated soil component adhering to the cleaning object. FIG. 1 is an example of the cleaning apparatus according to the aspect (5) of the present invention. The cleaning tank 1 and the heating tank 2 for containing the cleaning liquid as the main structure, the steam zone 3 filled with the vapor of the cleaning agent, the condensed cleaning agent is condensed by the cooling pipe 4, and the condensed liquid and the water adhering to the cooling pipe are combined. It consists of a water separation tank 5 for stationary separation, and mechanisms 6 and 7 for circulating a cleaning agent between the cleaning tank 1 and the heating tank 2. In actual cleaning, the object to be cleaned is placed in a dedicated jig or basket, and the cleaning is completed while passing through the cleaning tank 1 and the steam zone 3 in this order.

  In the cleaning tank 1, dirt attached to the object to be cleaned is cleaned and removed by the ultrasonic wave 9 while being controlled at a constant temperature by the cooling pipe 8. At this time, as a physical force, any method may be used as long as it is a physical force employed in a conventional cleaning machine such as a swing or a jet of cleaning agent in liquid.

  In the steam zone 3, the steam of the component (a) having a high steam pressure and the steam of the component (b) slightly contained in the cleaning agent of the present invention are condensed in the cooling pipe 4 and collected in the water separation tank 5 for cooling. After the temperature of the condensate is lowered by the pipe 10, the condensate is collected in the water separation tank 5 and then enters the washing tank 1 from the pipe 11 and overflows into the heating tank 2 as indicated by an arrow 12. After being heated by the heater 13, a part or all of the composition is converted into steam and condensed in the cooling pipe 4 as indicated by an arrow 14, and then returns from the pipe 15 to the water separation tank 5.

  In the steam cleaning performed in the steam zone 3 filled with the steam generated in the heating tank 2, since no contamination component is contained in the liquid formed by the condensation of steam on the surface of the object to be cleaned, finishing at the end of the cleaning process It is effective as a cleaning.

  The mechanisms 6 and 7 for circulating the cleaning agent between the cleaning tank 1 and the heating tank 2 send the cleaning agent from the heating tank 2 through the pipe 7 to the cleaning tank 1 by the circulation pump 6, and the cleaning tank By overflowing from 1 and returning to the heating tank 2 as indicated by an arrow 12, the cleaning composition of the cleaning tank 1 and the heating tank 2 is always kept the same, and the composition variation of the cleaning agent in the cleaning tank 1 is suppressed and stabilized. Detergency can be obtained.

The present invention will be described based on examples. The effects of the cleaning method and the cleaning apparatus were measured and evaluated as follows.
(1) Actual machine cleaning test A cleaning agent is put into the cleaning tank 1, distillation tank 2, and water separation tank 5 of the cleaning apparatus shown in FIG. The cleaned object was moved in the order of the cleaning tank 1 and the steam zone 3, and the degreasing performance was measured by the following operation and cleaning conditions.
1) Immersion cleaning conditions Cleaning tank 1:30 seconds, liquid volume 4.8L, ultrasonic wave / 45kHz, 80W
2) Steam cleaning conditions Steam zone 3: 30 seconds, steam cleaning is performed with steam obtained by heating the cleaning agent in the distillation tank 2 (liquid amount: 4.0 L).

  In the degreasing and cleaning property, the remaining oil content is measured by using an oil content measuring device (OIL-20, manufactured by Central Science Co., Ltd.) for the processing oil remaining on the cleaned part surface. Evaluation is based on the following criteria.

◎: less than ^{10μg / cm 2 ○: 10μg /} cm 2 or more ~20μg / cm ² less ×: metalworking fluid used in 20 [mu] g / cm ² or more test:
KZ216 (trade name: Cut Arbus, manufactured by Yushiro Chemical Industry Co., Ltd.)
D311 (Brand name: Da illustration, manufactured by Daido Chemical Industry Co., Ltd.)
YM358 (trade name: Cut Arbus, manufactured by Yushiro Chemical Industry Co., Ltd.)
[Examples 1 to 10]
Each component was mixed with the composition shown in Table 1 to obtain a desired cleaning agent. The actual machine cleaning test was performed under the temperature conditions described in Table 1 using the cleaning agent, and the results are summarized in Table 1. By the cleaning agent containing the component (a) and the component (b), there is no rinsing step by cleaning the cleaning bath temperature at 25 to 45 ° C. and the temperature difference between the cleaning bath temperature and the steam zone at 10 to 40 ° C. Excellent degreasing performance was obtained by the cleaning method and the cleaning apparatus.
[Comparative Examples 1 and 2]
The actual machine cleaning test was performed with the cleaning agents and test conditions described in Table 1, and the results are summarized in Table 1. Since the component (b) was not contained at all, sufficient degreasing and detergency was not obtained.
[Comparative Examples 3 to 7]
The actual machine cleaning test was performed with the cleaning agents and test conditions described in Table 1, and the results are summarized in Table 1. Since the difference between the temperature of the cleaning tank and the temperature of the zone to be cleaned with steam was less than 10 ° C., the amount of condensate on the surface of the object to be cleaned was small, so that sufficient degreasing and cleaning performance could not be obtained.

  The cleaning method and cleaning measures of the present invention include various processing oils and greases and waxes used when processing precision machine parts and optical machine parts, fluxes and boards used when soldering electrical and electronic parts, and substrates. It can be suitably used in the cleaning field for cleaning ink and paste attached to a screen used at the time of production and resins attached to a mixing portion of a resin discharge device.

DESCRIPTION OF SYMBOLS 1 Cleaning tank 2 Heating tank 3 Steam zone 4 Cooling pipe 5 Water separation tank 6 Circulation pump 7 Cleaning agent pipe 8 Cooling pipe 9 Ultrasonic wave 10 Cooling pipe 11 Condensate pipe 12 Cleaning agent flow 13 Heater 14 Steam flow 15 Condensation piping

Claims (6)

(A) 80 to 95% by weight of a non-chlorine fluorine compound having a vapor pressure at 20 ° C. of 1.33 × 10 ³ Pa or higher, (b) Component 5 having a vapor pressure at 20 ° C. of less than 1.33 × 10 ³ Pa A step of washing in a washing tank with a cleaning agent containing ~ 20% by weight, and
In a cleaning method including a step of cleaning with a steam obtained by heating the cleaning agent, and not having a step of rinsing the cleaning agent attached to an object to be cleaned.
The temperature of the said washing tank is 25-45 degreeC, The difference of the temperature of the zone wash | cleaned with the temperature of a washing tank and a vapor | steam is 10-40 degreeC, The cleaning method characterized by the above-mentioned. The cleaning method according to claim 1, wherein the difference between the temperature of the cleaning tank and the temperature of the zone cleaned with steam is 15 to 30 ° C. The cleaning method according to claim 1 or 2 , wherein the component (a) contains hydrofluorocarbon (HFC) and / or hydrofluoroether (HFE). Component (a) is 2H, 2H, 4H, 4H, 4H-pentafluorobutane (HFC365mfc), 2H, 3H-perfluoropentane (HFC43-10mee), methyl perfluorobutyl ether, methyl perfluoroisobutyl ether and mixtures thereof Ethyl perfluorobutyl ether, ethyl perfluoroisobutyl ether and mixtures thereof, 1,1,2,2-tetrafluoro-1- (2,2,2-trifluoroethoxy) ethane (HFE347pc-f) and 4H, 5H The washing | cleaning method of any one of Claims 1-3 containing the combination of 1 type, or 2 or more types chosen from, 5H- heptafluorocyclopentane. The component (b) contains one or more compounds selected from the group consisting of glycol ethers, glycol ether acetates, esters, and hydrocarbons, according to any one of claims 1 to 4. The cleaning method described. A cleaning tank for cleaning an object to be cleaned with a cleaning agent, a mechanism for adjusting the temperature of the cleaning agent in the cleaning tank, and a heating tank having a heating mechanism for generating vapor of at least one component constituting the cleaning agent A steam zone for steam cleaning with steam generated from the heating tank, a water separation tank for removing moisture from the condensate obtained by condensing the generated steam, and a cleaning tank and a heating tank for the cleaning agent, The cleaning apparatus used for the cleaning method of any one of Claims 1-5 which does not have a mechanism for rinsing the cleaning agent adhering to the to-be-cleaned object.

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