Patent ID: 9085751
Filing Date: 2015-07-21
Classification: B23K,C11D,C23G,H05K

Abstract:
1. A cleaning method comprising: a step for mixing 100 parts by weight of a liquid concentrate for cleaning composition with 50 parts to 1900 parts by weight of water, to form the cleaning composition; and a step for cleaning a solder flux adhering to an object to be cleaned in a clouded state, by applying said cleaning composition to said object, wherein the object to be cleaned is an object having a solder flux adhering thereto, the solder flux being cleaned from the object; wherein the liquid concentrate for cleaning composition includes, as organic solvents, at least a first organic solvent and a second organic solvent; the first organic solvent is at least one compound selected from the group consisting of a hydrophobic glycol ether compound, a hydrophobic hydrocarbon compound, a hydrophobic aromatic compound, a hydrophobic ketone compound and a hydrophobic alcohol compound, which has a boiling point in the range of 140° C. to 190° C. and a solubility in water (measurement temperature: 20° C.) of 50% by weight or less, the first organic solvent being included in the cleaning composition in an amount of greater than 0, and up to and including 38% by weight, relative to the total amount of the cleaning composition; the second organic solvent is a hydrophilic amine compound having a boiling point in the range of 140° C. to 190° C. and a solubility in water (measurement temperature: 20° C.) of greater than 50% by weight; the amount of incorporation of the second organic solvent is adjusted to a value in the range of 0.3 parts to 30 parts by weight relative to 100 parts by weight of the first organic solvent; in case further comprising a third organic solvent, the third organic solvent is at least one compound selected from the group consisting of a hydrophilic glycol ether compound, a hydrophilic alcohol compound, a hydrophilic nitrogen-containing compound and a hydrophilic sulfur-containing compound, which has a boiling point in the range of 140° C. to 190° C. and a solubility in water (measurement temperature: 20° C.) of 50% by weight or greater, the amount of incorporation of the third organic solvent is adjusted to a value in the range of 150 parts by weight or less relative to 100 parts by weight of the first organic solvent; in case further comprising a surfactant, the surfactant is a nonionic surfactant, wherein an amount of incorporation of the nonionic surfactant is adjusted to a value in the range of 0% to 3% by weight (provided that 0% by weight is excluded) relative to the total amount of the liquid concentrate for cleaning composition; and the amount of incorporation of an organic solvent which has a boiling point of higher than 190° C. is adjusted to a value of 0 parts by weight, or a value in the range of 0 parts to 15 parts by weight (provided that 0 parts by weight is excluded), relative to 100 parts by weight of the first organic solvent, wherein the cleaning composition is in a clouded state.