JP2965476B2 - Component peeling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for peeling a part from a jig after a processing step such as polishing and grinding, and more particularly, to a method for fixing a part fixed to the jig by a hot melt adhesive. And a method for dissolving and removing a hot melt adhesive from a jig.

[0002]

2. Description of the Related Art A method of fixing a component to a jig with an adhesive when performing processing such as polishing or grinding on various components, and peeling the fixed component from the jig after the processing step. Is adopted. As an adhesive used for fixing this component, a hot melt adhesive having a softening point of about 70 ° C., which is mainly composed of a rosin ester resin or a terpene phenol resin, is generally used. Conventionally, in order to remove the hot melt adhesive, chlorinated fluorinated hydrocarbons,
1,1,1-trichloroethane, trichloroethylene,
Chlorinated solvents such as dichloromethane have been mainly used. However, it has been found that these chlorinated solvents have environmental problems such as ozone layer destruction and groundwater pollution, and the use of these chlorinated solvents is currently being refrained. Therefore, there is a strong demand for detergents that substitute for these chlorinated solvents, and many alternative detergents such as alcohols, hydrocarbons, glycol ethers, and surfactants have been proposed.

[0003]

However, these alternative cleaning agents have insufficient cleaning ability with respect to the above-mentioned hot melt adhesives, and have been difficult to use as cleaning agents. In addition, many alternative cleaning agents require the treatment of waste liquid as industrial waste, causing new environmental problems and increasing the cost of cleaning compared to chlorinated solvents. Had. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of peeling a component which can easily remove a hot melt adhesive and can collect and reuse a used cleaning liquid by a simple method. Another object of the present invention is to provide a method for separating a component or a component that can easily remove a cleaning liquid remaining on a jig with water with water.

[0004]

According to the method of the present invention for removing a hot melt adhesive and peeling a part from a jig, as shown in the following formula (1), the method has 2 moles of oxyethylene, 1 to 2 carbon atoms ether bonded to one end
A water-soluble glycol ether compound having an alkyl group having 1 to 2 carbon atoms at the other end, and 2 mol of oxypropylene as shown in the formula (2), and having at one end thereof At least one glycol ether selected from the group consisting of water-soluble glycol ether compounds having an ether-bonded methyl group having 1 carbon atom and the other end having a methyl group having 1 carbon atom;
And at least one hydrocarbon selected from the group consisting of normal paraffinic hydrocarbons and isoparaffinic hydrocarbons in glycol ether: hydrocarbons = 50 to 9
A cleaning liquid mixed at a weight ratio of 0:50 to 10 is used. Further, glycol ether: hydrocarbon = 50
A range of from 70 to 50:30 is more preferable because the solubility of the hot melt adhesive and the rinsing property with water are further improved. Further, before use in the present invention
The cleaning liquid is used once for removing parts,
It may include a melted hot melt adhesive. Sand
The present invention relates to a hot-melt adhesive used for peeling a part.
Distill the washing solution that dissolves, and hot melt the washing solution
Regeneration process separated from adhesive and hot melt bonding
The parts that were fixed to the jig by the
The component is cured by contacting the liquid and removing the adhesive.
This is a method for peeling off parts from the tool.

[0005]

Embedded image

(Wherein R ₁ and R ₂ are a methyl group or an ethyl group, and R ₃ and R ₄ are a methyl group.) A water-soluble glycol ether represented by the formula (1) used in the present invention. Examples of the compound include diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, and diethylene glycol diethyl ether. The water-soluble glycol ether compound represented by the formula (2) is dipropylene glycol dimethyl ether. Further, as the hydrocarbon used in the present invention, normal undecane, isoundecane, normal dodecane,
Examples include isododecane, normal tridecane, and isotridecane. Further, if the water-soluble glycol ether compound is selected from the group consisting of diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, and diethylene glycol diethyl ether, and the hydrocarbon is selected from the group consisting of normal dodecane and isododecane, respectively, The solubility increases, and the component can be more easily peeled off from the jig.

In the formula (1), when a glycol ether compound in which R ₁ or R ₂ is an alkyl group having 3 or more carbon atoms is used, the solubility of the hot melt adhesive and the rinsing property with water are inferior. 1 mole of oxyethylene added
In this case, the flash point is close to the cleaning temperature, so that the safety is poor. When the number of moles of oxyethylene added is 3 or more,
Poor solubility of hot melt adhesive. Also, when R ₁ or R ₂ is a hydrogen atom, the solubility of the hot melt adhesive is poor.

Further, in the formula (2), the glycol ether compound in which R ₃ or R ₄ is an alkyl group having 2 or more carbon atoms is not water-soluble, so that the rinsing property with water is extremely poor and is not desirable as a cleaning solution. . When the number of moles of oxypropylene added is 1, the flash point is close to the washing temperature, so that the safety is poor. When the number of moles of oxypropylene added is 3 or more, the solubility of the hot melt adhesive is poor. Also, when R ₃ or R ₄ is a hydrogen atom, the solubility of the hot melt adhesive is poor. If the hydrocarbon has less than 11 carbon atoms, its flash point is 70 ° C. or lower, and it is not preferable to use it in large quantities according to the Fire Service Law. Further, hydrocarbons having 14 or more carbon atoms are inferior in solubility of the hot melt adhesive, and the time required for peeling off the component from the jig becomes longer, and it is substantially difficult to use it as a cleaning liquid. In addition, the proportion of the glycol ether compound and the hydrocarbon needs to be in the above range, and if the blending ratio of the water-soluble glycol ether compound exceeds 90, the solubility of the hot melt adhesive is poor, When the compounding ratio of the hydrocarbon exceeds 50, the rinsing property with water is inferior.

[0009]

The present invention will be described in more detail with reference to the following examples. FIG. 1 shows a part peeling process according to the present invention. Hereinafter, the part peeling step will be described with reference to FIG. First, in the cleaning step a), the components fixed to the jig are immersed in a cleaning liquid by a hot melt adhesive after finishing the processing steps such as polishing and grinding, and the adhesive is dissolved by the cleaning liquid to remove the parts from the jig. Peel off. Usually, this washing step is performed at 40-60 ° C. Next, in the rinsing step of b), the parts and the jig to which the cleaning liquid has adhered are washed with water to remove the cleaning liquid. Next, in the drying step c), water adhering to the component and the jig is removed by performing hot air treatment or the like on the component and the jig. Thus, the peeling step is completed, and the component is completed.

Further, the cleaning liquid used in the above-mentioned peeling method and in which the hot melt adhesive is dissolved can be easily separated from the hot melt adhesive by distillation and regenerated. The temperature required for the separation is about 250 ° C. at normal pressure, and the temperature can be further reduced under reduced pressure. For example, 20
Under mmHg, the distillation temperature required for separation is about 110 ° C. The liquid obtained by this distillation has no hot-melt adhesive dissolved, that is, is equivalent to a cleaning liquid before being used in the cleaning step, and can be used again in the cleaning step. Further, occurring in the rinsing process,
The water in which the washing solution is dissolved can be separated from the washing solution by distillation. The temperature required for separation is about 100 ° C., which is the boiling point of water at normal pressure, and distillation can be performed at a lower temperature under reduced pressure. For example, under 20 mmHg, the temperature required for distillation is about 35 ° C. In this case, the liquid obtained by distillation is substantially only water in which the washing liquid is not dissolved, and can be used again in the rinsing step. In addition, since the residue after distillation becomes substantially a washing solution, it can be reused as a washing solution used in the washing step. Also,
The stripping method of the present invention can end the stripping step by performing only a drying step such as applying hot air after completion of the washing step without using a rinsing step depending on a cleaning object. In addition, the vacuum distillation apparatus used to separate the cleaning liquid from the hot melt adhesive or to separate water from the cleaning agent has an explosion-proof specification and has a heating capacity of 50 ° C. or higher, preferably 100 ° C. or higher, Batch specification consisting of supply valve, tank, evaporator, decompressor, cooling condenser part,
Alternatively, it is desirable to further connect the washing line and the service tank. The peeling method of the present invention is a method of polishing a jig and a component after a polishing step of a ferrite head used in a magnetic recording apparatus or the like shown in the following examples, or a grinding step of a glass block used in an ultrasonic delay element or the like. Although it can be used for peeling, etc., it can be used when it is necessary to dissolve and remove the hot melt adhesive and separate the jig and the component, so it is not limited to the above-mentioned component.

Tables 1 and 2 show the compositions of the cleaning solutions used in the following Examples 1 to 12 and Comparative Examples 1 to 24, respectively.

[0012]

[Table 1]

[0013]

[Table 2]

The glycol ether compounds 1 to 8 and hydrocarbons a to e in Tables 1 and 2 respectively represent the following. Glycol ether compound 1: Diethylene glycol dimethyl ether 2: Diethylene glycol ethyl methyl ether 3: Diethylene glycol diethyl ether 4: Dipropylene glycol dimethyl ether 5: Diethylene glycol dibutyl ether 6: Diethylene glycol monoethyl ether 7: Triethylene glycol diethyl ether 8: Dipropylene glycol ethyl methyl Ether hydrocarbon a: normal undecane b: isododecane c: normal dodecane d: normal tridecane e: normal tetradecane

Examples 1 to 4 and Comparative Examples 1 to 9 Ferrite magnetic heads (20 ×
10 jigs (150 × 30 mm, thickness 2) were prepared by using 10 hot melt adhesives (trade name: Electron Wax, manufactured by Sou Electronics Co., Ltd.) with a thickness of 5 mm and a thickness of 1 mm.
mm). This was immersed in a cleaning solution at 60 ° C. having the composition shown in Tables 1 and 2, and was sonicated (47 kHz, 1 kHz).
20 W), and the time required for the magnetic head to completely peel off from the jig was measured. Table 3 shows the results.

[0016]

[Table 3]

Evaluation criteria ◎: Peeling time less than 3 minutes ○: Peeling time of 3 minutes or more and less than 5 minutes △: Peeling time of 5 minutes or more and less than 10 minutes ×: Peeling time of 10 minutes or more

[Examples 5 to 8, Comparative Examples 10 to 18] Glass blocks (length 10) used for ultrasonic delay elements and the like
0 mm, width 20 mm, height 30 mm) using a hot melt adhesive (trade name Adfix, manufactured by Nikka Seiko Co., Ltd.) using a stainless steel jig (length 150 mm, width 100 m)
m, thickness 2 mm). After the grinding step of cutting the glass to a thickness of 1 mm, 60 ° C. shown in Tables 1 and 2
, And irradiated with ultrasonic waves (47 kHz, 120 W), and the time required for all the cut glass to be peeled off from the jig was measured. Table 4 shows the results.

[0019]

[Table 4]

Evaluation criteria A: Peeling time less than 5 minutes O: Peeling time 5 minutes or more and less than 10 minutes Δ: Peeling time 10 minutes or more and less than 15 minutes X: Peeling time 15 minutes or more

[Examples 9 to 12, Comparative Examples 19 to 27] Ten ferrite magnetic heads and one stainless steel jig similar to those used in Examples 1 to 4 and Comparative Examples 1 to 9 are shown. The wafer was immersed in the cleaning solution shown in Table 1 and Table 2 at 60 ° C. for 3 minutes, and irradiated with ultrasonic waves (47 kHz, 120 W) to completely peel off the ferrite magnetic head and the stainless steel jig. Thereafter, the ferrite magnetic head and the stainless steel jig were immersed in pure water at room temperature for 30 seconds. Then 100
After placing the ferrite magnetic head and the stainless steel jig in a constant temperature bath at 30 ° C. and leaving them to stand for 30 minutes to completely remove the water, the liquid remaining on the ferrite magnetic head and the stainless steel jig was carbon tetrachloride. Extracted using. The extract was analyzed by infrared spectrophotometry to determine the presence or absence of the remaining washing liquid. Table 5 shows the results.

[0022]

[Table 5]

Evaluation Criteria な し: No liquid remaining, excellent in rinsing properties. Δ: The liquid remains slightly, and the rinsing properties are slightly inferior. ×: A large amount of liquid remains, and the rinsing properties are poor.

As described above, as shown in Examples 1 to 12,
The cleaning liquid used in the stripping method of the present invention has excellent removability of hot melt adhesive and rinsing property with water. On the other hand, the cleaning liquid in the comparative example is unsuitable for peeling off a part fixed to a jig by a hot melt adhesive as described below. Comparative Examples 1, 10, 19: These are made of only water-soluble glycol ethers without containing hydrocarbons, and have poor hot melt adhesive removability. Comparative Examples 2, 11, 20: These are composed of only hydrocarbons without containing water-soluble glycol ether, and have poor removability of hot melt adhesive and poor rinsing properties. Comparative Example 3,12,21: those R ₁ or R ₂ of formula (1) is blended with hydrocarbon and having 3 or more glycol ether compounds carbon removal property and rinsing property of the hot melt adhesive Inferior. Comparative Examples 4, 13, 22: Since R ₁ represented by the formula (1) is a hydrogen atom, the removability of the hot melt adhesive is inferior. Comparative Examples 5, 14, 23: The use of a glycol ether compound having an addition mole number of oxyethylene represented by the formula (1) of 3 or more is inferior in the removability of the hot melt adhesive. Comparative Examples 6, 15, and 24: A hydrocarbon containing 14 or more carbon atoms was used, and the hot-melt-adhesive removal property was poor. Comparative Examples 7, 16, 25: The blending ratio of the glycol ether compound was less than 50%, and the hot melt adhesive was inferior in removability. Comparative Examples 8, 17, 26: The compounding ratio of hydrocarbons is less than 10%, and the removability of the hot melt adhesive is poor. Comparative Example 9,18,27: those R ₃ of formula (2) was used glycol ether compounds ethyl group having 2 carbon atoms, rinsability is poor.

Example 13 A hot-melt adhesive (Adix (trade name, manufactured by Nikka Seiko Co., Ltd.)) was added to 90 parts by weight of a cleaning solution obtained by mixing 60% by weight of diethylene glycol ethyl methyl ether and 40% by weight of normal dodecane.
Parts by weight were dissolved. 16 L of this liquid was heated to 110 ° C. under a reduced pressure of 30 mmHg, and the composition of the liquid obtained by distillation was analyzed. The time for performing the distillation is 60 minutes. When the liquid obtained by distillation was analyzed by ultraviolet spectrophotometry, no contamination of the hot melt adhesive was observed. Further, when the distillate was analyzed by gas chromatography,
It was confirmed that the cleaning liquid was the same as in the initial compounding state. Further, using the liquid obtained by distillation, a ferrite head and a jig were peeled off by a method shown in Examples 1 to 4, and all the ferrite heads were peeled off from the jig within 3 minutes. Hot-melt adhesive removability equivalent to that of the compounded state was obtained.

[Embodiment 14] A ferrite magnetic head (20 × 5 mm, thickness 1 m) used for a video head or the like
m) Ten pieces were adhered to one stainless steel jig (150 × 30 mm, thickness 2 mm) using a hot melt adhesive (trade name: Electron Wax, manufactured by Sou Electronics Co., Ltd.). Using the steps shown in Table 6, the magnetic head was peeled from the jig. The washing liquid is a mixture of 70% by weight of diethylene glycol dimethyl ether and 30% by weight of isododecane. A, b, and c in the processes of Table 6 are respectively shown in FIG.
A, b, and c. As a result, a ferrite head peeled from the jig and from which the hot melt adhesive was sufficiently removed was obtained. Further, step b-1 shown in Table 6
About the mixture of washing liquid and city water generated in
Distillation was performed using a vacuum distillation regenerator heated to 35 ° C. under 0 mmHg. As a result, the washing liquid mixed in the distillate was 5% by weight or less, and the majority was water. Therefore, the obtained distillate could be reused in step b-1. The amount of water in the distillation residue was 5% by weight.
The results were as follows. Most of the cleaning solution was used, and the ratio between diethylene glycol dimethyl ether and isododecane was almost unchanged from the initial state. Therefore, the cleaning solution could be reused.

[0027]

[Table 6]

[0028]

As described above, the stripping method of the present invention is excellent in the washing property of the hot-melt adhesive and the rinsing property of the washing solution, and can be recycled by distillation. Such costs can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a view showing a part peeling step in an embodiment of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (72) Nobuo Sonoda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takeshi Kawano 1-1, Ishihara Nagatacho, Kichijoin, Minami-ku, Kyoto-shi (72) Inventor Shigeru Kegasawa 1-52 Shonouchi, Kamiueno-cho, Muko-shi, Kyoto (72) Inventor Toshiichi Nabeshima 19, Nishi-Shichijo-Higashikubocho 19, Shimogyo-ku, Kyoto (56) References JP-A-64-11181 (JP, A) JP-A-4-65495 (JP, A) JP-A-6-184778 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C11D 7/24 C09J 5/00 C11D 7 / 26 C11D 7/50

Claims (4)

(57) [Claims] 1. A component fixed to a jig with a hot melt adhesive includes: (A) Formula (1) and Formula (2): (In the formula, R ₁ and R ₂ are a methyl group or an ethyl group.)
Selected from water-soluble glycol ether compounds represented by
And (B) a normal paraffinic hydrocarbon having 11 to 13 carbon atoms.
Selected from the group consisting of silicon and isoparaffinic hydrocarbons
Consisting of a mixture of at least one hydrocarbon
A: B = 50 to 90:50 to 10 by weight.
A method for separating a component from a jig by removing the adhesive by contacting the cleaning liquid with the cleaning liquid, wherein the hot-melt adhesive is dissolved for use in separating the component.
Distill the washing liquid and separate the washing liquid from the hot melt adhesive.
Jig with hot melt adhesive
The parts fixed in contact with the regenerated cleaning solution,
A method for removing a component from a jig by removing the adhesive . 2. A water-soluble glycol ether compound.
(A) is at least one selected from the group consisting of diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether and diethylene glycol diethyl ether, and the hydrocarbon (B) is at least one selected from the group consisting of normal dodecane and isododecane. A method for peeling a part as described above. 3. Further, claim 1 comprising the step of removing the cleaning liquid attached to the component and the jig with water or
Or the method for peeling parts according to 2 . 4. The cleaning liquid according to claim 1, wherein the cleaning liquid is diethylene glycol diethylene glycol.
Methyl ether and isododecane, diethylene glycol
Ethyl methyl ether and normal dodecane, or die
Tylene glycol diethyl ether and dipropylene glycol
Consists of coal dimethyl ether and normal undecane
The method for peeling a component according to claim 1 .