JP2001247890A - Processing agent which prevents creaky sound between urethane foam and metal surface and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing agent to prevent a creaky sound generated when a metal surface to which oil adheres is brought into contact with a urethane foam. SOLUTION: The processing agent to prevent a creaky sound comprises a mixed surfactant of a nonionic oil-soluble surfactant and a nonionic water-soluble surfactant and a water-soluble wax emulsion to dilute the mixed surfactant twice to fifteen times. The mixed surfactant has an HLB of 8.0-10 and the processing agent has a wax content less than 18% and a pH of 8.0-10.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to preventing the generation of squeak noise caused by the contact between a metal surface and a urethane foam, and more particularly, to the prevention of the generation of squealing noise when the urethane foam comes into contact with a metal surface to which oil has adhered. The present invention relates to a treating agent for preventing the generation of squeak noise by treating a metal surface, and a method therefor.

[0002]

2. Description of the Related Art Urethane foams have excellent cushioning properties and are therefore used in various fields. In many cases, urethane is used not only alone but also in a state in which it is incorporated into a processed metal frame or metal plate such as a seat or a bed.

[0003] However, urethane foams have the property of being difficult to slip in material, whether they are molded or cut.
Therefore, when the urethane foam rubs against the metal surface, there is a problem that a squeaky and unpleasant noise is generated.

The generation of the squealing noise is prevented when the urethane foam is used as a cushion for a seat of an automobile or the like or as a cushion for a bed, which hinders comfortable use. Measures are needed.

In order to prevent the generation of squeak noise, a nonwoven fabric, a felt-like material, or the like is patched after urethane foam molding, so that the urethane foam does not come into direct contact with the metal surface.

A seat for an automobile is often manufactured by foam molding using a mold. However, at the time of urethane foam molding, a nonwoven fabric or the like is set in the mold in advance, and is simultaneously laminated and molded. The presence of a non-woven fabric prevents squeak noise.

[0007] Although the presence of such a nonwoven fabric can prevent the generation of effective squeaking noise, the number of manufacturing steps is increased and the overall cost is increased.

The squeak noise between the urethane foam and the metal surface varies considerably depending on the condition of the metal surface. For example, when the squeak noise is applied with melamine alkyd or the like, almost no squeak noise is generated. However, recently, in order to reduce costs, especially for automobiles, painting of metal frames has been abolished, except for specific cases, and as described above, the use of costly non-woven fabrics and felts caused squeak noise. The situation has to be prevented.

[0009] Instead of using non-woven fabrics and felts, grease or petrolatum may be applied to the portion where the urethane foam rubs against the metal surface to prevent the generation of squeak noise, but after drying, the squeak noise is again observed. Occurs. Although grease dries slowly and can be expected to have a certain effect in preventing the generation of squeak noise, it is difficult to handle urethane foam and metal surfaces for a long period of time. It contaminates parts and assembly lines, making it practically difficult to use on manufacturing sites.

Recently, "sliding agents" which are applied to urethane foams to prevent squeaking noise are commercially available, but they are very expensive and have the desired properties. To achieve the effect, a large amount of coating is required. In addition, the slip agent dries very slowly, causing contamination of parts and assembly lines similar to those described above. If it is dried sufficiently to avoid this, the effect of preventing the generation of squeak noise will be lost. Therefore, the intended use of this slip agent is very limited.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to prevent generation of squeak noise generated when a metal surface to which oil has adhered and a urethane foam. And a method therefor.

Another object of the present invention is to provide a treating agent which achieves a more reliable rust-preventing effect and reliably prevents the generation of squealing noise even when the oil adhering to the metal surface is rust-preventive oil. And a method thereof.

It is a further object of the present invention to provide a treating agent and a method for preventing the occurrence of squeaking noise even before or after the treated surface is dried.

[0014]

The treatment agent of the present invention, which achieves the above object, is provided with a metal surface for preventing the generation of squeak noise generated when a urethane foam comes into contact with a metal surface to which oil has adhered. A mixed surfactant of a nonionic oil-soluble surfactant and a nonionic water-soluble surfactant, and 2 to 15 mixed surfactants.
Water-soluble wax emulsion solution for diluting, preferably 5 to 10 times.

Here, the HLB value of the surfactant after mixing is 8.0.
The water-soluble wax emulsion solution is a solution obtained by emulsifying a wax containing an oxidized polyethylene wax with a nonionic, anionic, or cationic surfactant. The wax content in this treatment does not exceed 18% and the pH of the treatment is 8.0 to 10.
Between 0.

When the dilution ratio of the surfactant is 2 to 15 times,
In addition to ensuring the ease of application, the required minimum surfactant mass of 6% or more can be ensured, and the effective wax content (rate) can be adjusted to 18% or less.

When the pH of the treating agent is adjusted from 8.0 to 10.0,
Excellent stability, application, especially sprayability, brushability, workability and rust prevention effect of the final treatment agent. When the pH is lower than 8.0 and the acid side is set, the anti-corrosion property is reduced and the effective wax component is easily separated, and when the pH is higher than 10.0 and the alkaline side is stronger, the corrosion resistance is good, but Contact will adversely affect the skin.

Here, the HLB value (referred to as a balance index between hydrophilicity and hydrophobicity in the molecule) of the mixed surfactant is 8.0 to 1
0, preferably 8.5 to 9.5. The HLB value of a water-soluble surfactant is 10 to 15, and the HLB value of an oil-soluble surfactant is 7.
Preferably it is 3 to 9.5.

The reason why the HLB value of the mixed surfactant is set to 10 or less is that if the HLB value exceeds this value, the hydrophilicity becomes strong. Even if the mixture is diluted and dispersed with various wax emulsion solutions and applied to a metal surface, it "repels water". This causes the formation of a uniform thin film, making it impossible to form a uniform thin film. In addition, drying after applying the treatment agent is delayed, workability is deteriorated, and the prevention of squeak noise and the rust prevention effect are also reduced. . Conversely, if the HLB value is less than 8, the lipophilicity is increased, the drying property, workability, and prevention of squeak noise are all improved, and the corrosion resistance is improved, but the stability of the solution is poor and the separation problem is caused. Is caused.

This treating agent is evenly applied to a metal surface to which oil such as rust-preventive oil or fats and oils has adhered by spraying, brushing, roll coating or the like.

After application, the oil becomes an emulsified or jelly-like substance having almost no viscous action, and is firmly adsorbed on the metal surface to form a stable non-viscous thin layer. Since this layer is interposed between the urethane foam and the metal surface, generation of squeak noise is prevented.

The treating agent of the present invention has toxicity to the human body,
No irritation to skin.

[0023]

DETAILED DESCRIPTION OF THE INVENTION The present inventor has studied the generation of squeak noise generated when a urethane foam rubs against a metal surface made of steel (hereinafter referred to as a metal surface). When a body is loaded with oil such as rust-preventive oil and oils and fats,
We found that it was time to move in such a way as to get caught (see Japanese Patent Application No. 10-237482).

The generation of the squeak noise can be prevented by treating the metal surface to which the oil has adhered and changing it to a hydrophilic emulsified state or a jelly state. They found that a mixture of oil-soluble and water-soluble surfactants diluted with water can be used.
A patent was filed with the right in the above application (Patent No.
3022502).

Further, the inventor of the present invention discloses that the nonionic mixed surfactant is diluted with a water-soluble wax emulsion solution instead of the water used for diluting the mixed surfactant, thereby further improving the reliability. A processing agent was invented and will be described in detail below in comparison with various experimental examples.

The surfactant used in the present invention is a polyethylene glycol distearate-based surfactant (surfactant) which is a nonionic oil-soluble surfactant.
A), a nonionic oil-soluble surfactant, polyethylene glycol dioleate surfactant (surfactant B), and a nonionic water-soluble surfactant, polyoxyethylene monooleate A sorbitan surfactant (surfactant C), from which an oil-soluble surfactant and a water-soluble surfactant were combined and mixed (see Tables 2 to 5). Other than the exemplified surfactants, the present invention can be used by combining a nonionic oil-soluble surfactant with a nonionic water-soluble surfactant.

Table 1 shows the water-soluble wax emulsion solutions used as diluents in the present invention. Wax emulsion A is used as a cold urethane release agent, wax emulsion B is used as a hot urethane release agent, wax emulsion C is used as a metal lubricant, wax emulsion D is used as a fiber or paper processing agent, and wax emulsion E is used as a fiber or paper. It is commercially available as a processing agent or the like. Solutions A, B, C, and D consisted of oxidized polyethylene wax with paraffinic wax at 12% and 40%, respectively.
%, 37%, and 35%.

[0028]

[Table 1] As shown in Table 1, for example, wax emulsion A
When used, it contains 6.5% solids,
The wax will contain 68% of the solids. In Experimental Example 2 shown in Table 2 below, for example, a 5-fold solution 140
Weight of wax emulsion C (140 weight of a five-fold dilution of the wax emulsion solution), the content of wax in the treating agent is ((140/140 /
5) x 0.35 x 0.82) ÷ Gross weight (150) = 0.0536 (5.36%)
Is calculated.

The solutions shown in Table 1 are examples, and a water-soluble wax emulsion solution obtained by emulsifying an oxidized polyethylene wax with a nonionic, anionic, or cationic surfactant is used in the present invention. be able to. This oxidized polyethylene wax is
It is composed of polyethylene oxide or its derivatives mainly composed of hydrocarbons having a carbon number of 70 to 570 and a molecular weight of 1000 to 8000, and has a carboxyl group and / or a hydroxyl group in the molecule. The melting point of this oxidized polyethylene wax is from 100 ° C to 130 ° C.

As described above, the wax, which is the main component of the water-soluble wax emulsion solution, is made of an oxidized polyethylene wax because it has a higher melting point and molecular weight than natural wax, generally has better physical properties, and is synthesized from other synthetic waxes. Waxes, such as synthetic hydrocarbons, denatured waxes, hydrogenated waxes,
It is generally less harmful to human health than aliphatic waxes, and it is easy to emulsify with nonionic, cationic and anionic surfactants, and a stable water-soluble wax emulsion solution can be obtained. is there.

Further, the oxidized polyethylene wax can be easily produced industrially in a required amount, and can be obtained by adding a carboxylic acid or a hydroxyl group in the molecule.
By using a small amount of surfactant, a stable water-soluble emulsion solution can be obtained.

The water-soluble wax emulsion solution also comprises
35% solids in the above oxidized polyethylene wax
% To 5%, preferably 20% to 7%, and may be a solution obtained by emulsifying a wax to which a petroleum-based paraffin wax is added with a nonionic, anionic or cationic surfactant. . This petroleum-based paraffinic wax is mainly composed of straight-chain saturated hydrocarbons having 20 to 36 carbon atoms, has a molecular weight of 225 to 450, and has a small amount of side-chain saturated hydrocarbons, naphthenes, or aromatics. May be included. The melting point of this petroleum paraffin wax is 47 to 78 degrees.

Examples 1 to 14 of treating agents according to the invention
And Experimental Examples 1 to 13 are shown in Tables 2 to 5. Table 2 further shows
The results of the separation of the solution of each example, the wettability, the corrosion resistance, and the generation of squeak noise on the metal surface after application to the metal surface to which the rust-preventive oil has adhered are shown.

[0034]

[Table 2]

[0035]

[Table 3] Experimental Example 1 shows a typical nonionic oil-soluble surfactant (B) having a HLB value of 10 (upper limit of hydrophilicity) and a nonionic water-soluble surfactant according to the above-mentioned Patent No. 3022502. This is a treatment agent prepared by diluting the mixed surfactant of agent (C) 15-fold with water (maximum dilution ratio) and adjusting the pH to 8.0. This treating agent does not separate the composition liquid and has good wettability to the metal surface. It also has excellent corrosion resistance and no squeak.

Example 1 is the same as Example 1, except that it was diluted with wax emulsion E (Table 1) instead of water, and Example 2 was diluted with wax emulsion D.

Experimental Examples 2 and 3 are the same as those in Example 1 except that they are diluted with wax emulsions C and B, respectively.

Examples 1 and 2 diluted with a water-soluble wax emulsion solution have more excellent corrosion resistance than those diluted with water, and can prevent generation of squeak noise. However, in Experimental Examples 2 and 3 similarly diluted with a water-soluble wax emulsion solution, the prevention of squeak noise was
It is as good as or better than water, but its corrosion resistance is slightly lower or lower than that of water.

As shown in Table 1, the main component of the water-soluble wax emulsion solution was wax emulsion E
Contains no paraffinic wax, but wax emulsion D contains 35%, wax emulsion C contains 37%, and wax emulsion B contains 40% paraffinic wax. On the other hand, the treating agents of Examples 1 and 2 and Experimental Examples 2 and 3 contain a predetermined amount of wax. For this reason, the performance tends to be improved by the inclusion of washes in the treatment agent.
If a water-soluble wax emulsion solution containing more than 10% is used, the corrosion resistance is reduced.

Experimental Example 4 is the same as Experimental Example 1, except that
Was set to 7.5 (the lower limit of the pH in the above-mentioned patented invention), and in Experimental Example 5, the wax of Example 4 was diluted with wax emulsion A instead of water. Further, Example 3 (Table 3) is the same as Example 5 except that the pH was changed to 8.0. Also,
In Example 4, the pH was adjusted to 9.0. The wax emulsion A used here had a paraffin content of 12%
Although the amount is lower than that of 5%, separation of the composition of the treating agent occurs at pH 7.5. However, when the pH is 8.0 or more (Examples 3 and 4), excellent performance is exhibited as in Examples 1 and 2. However, even when separation occurs when the pH is 7.5 (Experimental Example 5), the corrosion resistance and squeak noise resistance are superior to those when diluted with water, and can be used by stirring.

From the above results, it was found that the treatment agent diluted with a water-soluble wax emulsion solution obtained by emulsifying an oxidized polyethylene wax or a derivative thereof exhibited poor phase separation, corrosion resistance, and squeak noise of the composition of the treatment agent. Therefore, even when diluted with water, it is possible to obtain superior corrosion resistance and squeak noise compared to dilution with water, even when the HLB value, the maximum dilution ratio, and the lowest pH are severe, which are severe hydrophilic properties. . However, if the water-soluble wax emulsion solution contains more than 35% of paraffin wax, the corrosion resistance is lower than when diluted with water alone.

In Experimental Example 6, contrary to Experimental Example 4, the HLB value of the mixed surfactant was set to 8.0 (the highest lipophilicity in the patent invention diluted with water), and the dilution ratio was doubled ( This is an example of dilution with water when the mixed surfactant is the most abundant component in the present invention and the pH is 7.5 (the limit in which the composition liquid is easily separated in the present invention).
Experimental example 7 is an example under the same conditions as experimental example 6, but diluted with wax emulsion D diluted instead of water only. Example 5 was performed under the same conditions as in Example 7, except that the pH was 7.5.
This is an example in which the sample is moved to the alkaline side from 8.0 to 8.0. Experimental Example 8 was performed under the same conditions as in Example 5 except that wax emulsion C was used.
This is an example of dilution with.

As described above, when two kinds of nonionic mixed surfactants are diluted with water (Japanese Patent No. 3022502).
When the emulsion is diluted with wax emulsion D containing 35% paraffinic wax, the HLB value, dilution ratio, and pH limit values (Experimental Example 6) are excellent in corrosion resistance and squeaking noise, but the composition liquid is gel. (Experimental Example 7). However, p
When H was moved to the alkaline side of 8.0, gelation was not observed, but stabilized (Example 5). When diluted with Wax Emulsion C containing 37% paraffinic wax at this pH, the composition does not separate, but the corrosion resistance is reduced. However, the squeak resistance is better than when diluted with water.

[0044]

[Table 4] In Examples 6, 7, 8, 9 and 10 (Table 4), the above two kinds of mixed surfactants were used to prepare a highly hydrophilic HLB value of 10, which is close to the limit of rust prevention on a metal surface, and a dilution ratio of 15 times. , PH 8.0, while maintaining the same conditions, diluted with wax emulsion E, and the wax content was 0.85, 1.0, 1.5, 10, and 18%, respectively. Experimental example 1 corresponds to the case where the wax content is 0%. As can be seen from these figures, the corrosion resistance and squeak sound resistance are improved as the wax content is increased, but the corrosion resistance and squeak sound resistance are not significantly improved when the wax content is around 1.0 or 1.5 or more. .

In Example 11, a mixed surfactant of surfactant A and surfactant B was mixed with wax emulsion D so that the HLB value was 8.0, the dilution ratio was twice, and the pH was 8.0. In this example, the wax content was 18%,
Experimental Example 9 is an example in which the dilution ratio of Example 11 was increased by 50%, and the wax content was further increased to 21% while maintaining a stable state. In Example 10 (Table 5), the dilution ratio of Example 9 was reduced to half or less than twice, and while the concentration of the surfactant in the composition was very high, the wax content was reduced to almost half. It is an example. Experimental Example 11 is an example in which the alkalinity of the composition was adjusted to pH 10 under the same conditions as in Experimental Example 10.

From the above, the two types of mixed surfactants are HL
When the B value is 8 and the lipophilicity is 8 or more, if the dilution ratio is 2 times or more, even if the wax content is 18%, the gelation of the composition does not occur, and both the corrosion resistance and the squeaking noise are extremely low. Excellent results (Example 11).

However, when the wax content reaches 21%,
Even if the dilution ratio is increased by 50% and the concentration of the mixed surfactant is lowered, the composition liquid gels and becomes unstable (Experimental example)
9). Further, even if the wax content of the composition liquid was reduced by half to 11.7%, if the dilution ratio became less than twice or 1.4 times, a gelled state would be generated in the composition liquid (Experimental example 10). At this time, even if the pH of this composition was further stabilized from 8.0 to 10 and then further stabilized, the composition remained in a gelled state (Experimental Example 11). It can be seen that the stability of the composition is significantly affected. However, the corrosion resistance and the squeaking noise resistance were satisfactory without any problem.

[0048]

[Table 5] Experimental Example 12 shows a case in which a surfactant mixture of surfactant A and surfactant B was diluted with wax emulsion E. The HLB value was 8.0, which was strongly lipophilic, and the pH was 8.0, but the wax content was high. Example 12 is an example when diluted with wax emulsion D and the wax content was 18%, and Experimental Example 13 was the same as Example 12 Example 13 is the same condition as Example 12, except that the pH is 7.5, which is lower than 8.0.
Example 14 is an example in which the pH was further increased to 9.5, and the pH was further increased to 10 in Example 14.

As can be seen from these examples, when the dilution ratio was set to 15 times at a strongly lipophilic HLB value of 8.0, the gelling phenomenon that occurred when the dilution ratio was doubled or near the same was observed. Similarly, when the wax content is 19.5%, even when the pH is 8.0, the composition becomes unstable and causes phase separation (Experimental Example 12). However, when the wax content is 18%,
The stability of the composition was good and no phase separation occurred (Example 1
2). However, when the pH is changed from 8.0 to 7.5, the composition becomes unstable at low temperatures, etc., and phase separation occurs, unlike when diluted with water (Experimental Example 13). On the other hand, the pH is strongly alkaline
Even if adjusted to 9.5 or 10, when diluted 15-fold, the composition solution is stable and no problems such as phase separation occur. Even if phase separation occurs, it can be used if it is used with stirring, and in this case, both corrosion resistance and squeak noise resistance are good.

The following can be seen from Tables 2 to 4.

The treating agent obtained by diluting the two nonionic mixed surfactants having an HLB value of 8.0 to 10. with a water-soluble wax emulsion solution to 2 to 15 times provides the desired resistance. Achieving squeak noise and corrosion resistance, this effect is superior to that of the treatment agent diluted with water.

In the treating agent, wax is contained therein by dilution with a water-soluble wax emulsion solution, and the corrosion resistance and the squeaking noise resistance are improved as the wax content increases (however, the wax content is reduced). 1.0, 1.5
%, There is no remarkable improvement). However, when the wax content exceeds 18%, phase separation of the composition liquid and excessive increase in viscosity occur, causing gelation. This may adversely affect workability such as instability of the composition solution, transfer of the composition solution, and application.

Here, as the water-soluble wax emulsion solution to be used, those commercially available for various purposes can be used. Some commercially available water-soluble wax emulsion solutions contain paraffin wax. However, if this paraffin wax is contained in excess, it has a significant effect on corrosion resistance.
It is necessary to use one less than a predetermined amount.

When the pH of the treating agent is adjusted to 8.0 to 10.0, a stable treating agent can be obtained.

[0055]

According to the present invention, when a treating agent is applied to a metal surface to which oil has adhered, a non-viscous thin layer is formed on the metal surface, which intervenes between the urethane foam and the metal surface. As a result, no squeak noise is generated.

The application of this treating agent is, of course, compared to the conventional case, but the operation is the same as in the case of diluting two types of mixed activators with water, and it is easier, cheaper and more excellent. In addition, highly reliable rust prevention on the metal surface can be prevented, and generation of squeaking noise can be prevented. In particular, even with a low wax content of 1.0 to 5.0%, the intended purpose can be achieved sufficiently and inexpensively.

Further, according to the present invention, even if the oil adhering to the metal surface is a rust-preventive oil, it has good wettability,
The water evaporates relatively quickly, and the handling becomes easy.
Further, even after the application, in an undried state or even after being completely dried, the generation of squeak noise can be prevented while maintaining the rust-preventive effect.

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[Procedure amendment]

[Submission date] March 10, 2000 (200.3.1.1)
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction contents]

[0034]

[Table 2]

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10M 101/02 C10M 101/02 107/04 107/04 C23C 22/00 C23C 22/00 Z // C10N 20 : 00 C10N 20:00 Z 20:04 20:04 30:00 30:00 Z 30:12 30:12 50:02 50:02 (72) Inventor Fumio Goto 8-3-8 Kojima Ogawa, Kurashiki City, Okayama Prefecture No. Namba Press Kogyo Co., Ltd. F-term (reference) 4F070 AA13 AA52 AA63 AB13 AE14 CA01 CB01 CB13 4H104 AA01C BA02A CA16A DA02A DA05A EA01C EA03A EB04 JA13 LA06 LA20 PA01 QA02 QA08 RA06 4B01 BB03 BB05 CA15 CA37 CA39 DA16

Claims (11)

[Claims] (1) To prevent the generation of squeak noise generated by urethane foam contacting a metal surface to which oil has adhered,
A treating agent for treating a metal surface, wherein a mixed surfactant of a nonionic oil-soluble surfactant and a nonionic water-soluble surfactant, and the mixed surfactant is 2 to A water-soluble wax emulsion solution for diluting by 15 times, wherein the HLB value of the mixed surfactant is 8.0 to 10, and the water-soluble wax emulsion solution contains an oxidized polyethylene wax. A solution in which wax has been emulsified with a nonionic, anionic, or cationic surfactant and has a wax content of 18% in the treating agent.
A treating agent having a pH of 8.0 to 10.0, not exceeding a percentage. 2. The oxidized polyethylene wax is:
The treating agent according to claim 1, comprising a hydrocarbon having 70 to 570 carbon atoms and a molecular weight of 1,000 to 8000, which is mainly composed of a polyethylene oxide or a derivative thereof. 3. The oxidized polyethylene wax according to claim 1,
The treating agent according to claim 3, wherein the treating agent has a carboxyl group and / or a hydroxyl group in the molecule. 4. The water-soluble wax emulsion solution according to claim 1,
A solution obtained by emulsifying a wax obtained by adding a petroleum-based paraffin wax containing 35% to 5% in solid content to an oxidized polyethylene-based wax with a nonionic, anionic, or cationic surfactant. Claim 1
The processing agent according to any one of the above. 5. The method according to claim 1, wherein the paraffin wax is a solid content,
5. The treating agent according to claim 4, containing 20% to 7%. 6. The treating agent according to claim 4, wherein the petroleum-based paraffin-based wax mainly contains a linear saturated hydrocarbon having 20 to 36 carbon atoms, and has a molecular weight of 225 to 450. 7. The treating agent according to claim 6, wherein the petroleum-based paraffin wax contains a side chain saturated hydrocarbon, naphthene, or aromatic one. 8. The HLB value of the water-soluble surfactant is 10 to 1
5. The treating agent according to claim 1, wherein the treating agent is 5. 9. The oil-soluble surfactant having an HLB value of from 7.3.
The treating agent according to claim 1, wherein the treating agent is 9.5. 10. The treating agent according to claim 1, wherein the surfactant is diluted 5 to 10 times. 11. A method for treating a metal surface in order to prevent the occurrence of squeak noise generated when the urethane foam comes into contact with the metal surface to which oil has adhered. A thin coating of the treatment agent described above, whereby the oil becomes an emulsified or jelly-like material having substantially no viscosity, and forms a non-viscous thin layer adsorbed on a metal surface after drying. And how.