KR960001666B1 - Composition of defatting agent - Google Patents

Abstract

The title composition comprises 85-95 wt% nonionic surfactant based on polyoxyethylene alkyl phenol and 5-15 wt% tributylphosphate. The nonionic surfactant is selected from polyoxyethylene phenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene lauryl alcohol ether, polyoxyethylene alkyl ether or polyoxyethylene phosphate ester. The obtained degreasing agent has good workability, permeability, dispersivity as well as good fat-removability.

Description

Leather degreasing agent composition

The present invention relates to a leather degreasing agent composition. More specifically, the present invention includes a polyoxyethylene alkylphenol-based nonionic surfactant and tributyl phosphate in a conventional leather degreasing agent component, thereby improving degreasing power and greatly improving workability with low foaming force and freezing point. It relates to a leather degreasing agent composition.

The degreasing process in the leather processing process effectively removes the fat contained in the leather itself. If the degreasing is insufficient, subsequent processes are not desired. Degreasing should be completed sufficiently because of a bad odor or whitening (SPEW).

The leather degreasing process is roughly divided into mechanical degreasing and chemical degreasing. In addition, the chemical degreasing method can be divided into solvent degreasing method and surfactant degreasing method.

In solvent degreasing, white kerosene (ie, ordinary oil) can be used as a solvent, as well as a low boiling point solvent that dissolves fat. Therefore, the solvent degreasing method has the advantage of good degreasing effect and low price, but it is difficult to treat waste water by solvent, so it is environmental pollution, difficult to control degreasing, and excessive degreasing, which is likely to cause surface moistening of leather. Currently rarely used.

The surfactant degreasing method has been proposed as a method of solving the problem of the solvent degreasing method by the development of the chemical industry, and is a method of degreasing by the action of emulsifying insoluble fats present in the leather into water-soluble.

In a typical surfactant degreasing method, polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene lauryl alcohol ether, polyoxyethylene alkyl ether, polyoxyethylene oleic acid ester and the like are used.

The surfactant degreasing method can perform good degreasing and cleaning without damaging the leather, but it is inconvenient in workability due to excessive bubbles during processing, degreasing power is less than solvent degreasing, and it is inconvenient to use because the product is frozen in winter. Has the disadvantages.

The present inventors continued to study the effect of the surfactant degreasing method to solve the above-mentioned problems of the prior art, and as a result, a specific ratio of polyoxyethylene alkylphenol-based nonionic surfactant and tributyl phosphate to a conventional leather degreasing agent It was found that the degreasing force was enhanced by containing, and the foaming force and the freezing point were lowered, which significantly improved the workability, thus completing the present invention.

The present invention provides a leather degreasing agent composition comprising 85 to 95 parts by weight of a polyoxyethylene alkylphenol-based nonionic surfactant and 5 to 15 parts by weight of tributyl phosphate.

The tributyl phosphate used in the present invention can be easily prepared by the method described in US Patent No. 3,020,303 (1962). For example, it can be prepared by reacting 1 equivalent of phosphorus oxychloride with 3 equivalents of butanol having 4 alkyl carbons.

As the nonionic surfactant used in the present invention, polyoxyethylene phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene lauryl alcohol ether, polyoxyethylene alkyl ether or polyoxyethylene oleic acid ester is preferable, and double polyoxyethylene Nonylphenyl ether (ethylene oxide addition mole number 8-10) or polyoxyethylene octyl ether (ethylene oxide addition mole number 8-10) is especially preferable.

The content of tributyl phosphate used in the leather degreasing agent composition of the present invention is preferably 5 to 15 parts by weight.

When the content of tributyl phosphate is 15 parts by weight or more, the component interaction is decreased and the content of the surfactant is relatively low, so that wetting and degreasing power may be lowered. In addition, when used in 5 parts by weight or less, there is no component interaction may reduce the emulsification, penetration, dispersibility.

The leather degreasing agent composition according to the present invention not only exhibits a better degreasing effect than conventional surfactants in leather degreasing but also has the following excellent physical properties.

① It suppresses bubbles during degreasing and has excellent workability and easy wastewater treatment.

② Penetration is increased by reducing the surface tension of the surfactant.

③ The degreasing power is increased by the synergistic effect of the surfactant.

④ enhance the dispersibility of the surfactant.

⑤ It can prevent freezing of product during winter season.

Hereinafter, the present invention will be described by way of examples.

Example 1

5 parts by weight of tributyl phosphate and 95 parts by weight of polyoxyethylene nonylphenyl ether (8) were stirred well at room temperature to prepare a leather degreasing agent composition.

[Examples 2 to 9]

Examples 2 to 9 were prepared in a leather degreasing agent composition in the same manner as in Example 1 in the ratio shown in Table 1.

[Comparative Examples 1 to 7]

Comparative Examples 1 to 7 were prepared in a leather degreasing agent composition in the same manner as in Example 1 in the ratio shown in Table 1.

TABLE 1

[Application Example]

The degreasing force, foaming force, surface tension and freezing point of the leather degreasing agent compositions of Examples 1 to 9 and Comparative Examples 1 to 7 were measured by the following test methods.

[One. Degreasing force]

1) Preparation of Test Piece

After degreasing leather, take the size of 20 × 20㎠ (thickness: 1.5 to 2.0mm), wash it with clean water, and wash the degreased leather prior to washing at 30 ° C in a laboratory drum manufactured by Werner Mathis (Switzerland). A leather degreasing agent composition is added to the same amount (leather weight ratio 1%), rotated for 1 hour, washed with clean water, and dried.

2) Content Measurement (KSM6882)

The test piece prepared in 1) is extracted with petroleum ether using a Soxhlet apparatus.

① The test piece is dried in a drying oven at 150 ℃ for 2 hours.

② Cut the specimen about 0.2cm2.

③ Weigh the specimen (Z).

④ Place the specimen in a cylindrical filter and install the Soxhlet tester.

⑤ Weigh the 250ml round flask exactly (X).

⑥ Extract for 6 hours with petroleum ether.

⑦ The solution extracted in the round flask is volatilized by petroleum ether using rotary distillation and dried in oven.

3) Content calculation

% Content =

[2. Bubble power]

1) Foaming force was measured by the Rose-Miles method using Rose-Miles.

2) Preparation of Test Solution

Samples prepared in Examples 1 to 9 and Comparative Examples 1 to 7 are each prepared in a 0.25% aqueous solution and heated to 40 ° C.

3) Test method

① Fill test solution with Rose Miles to the marking line.

② Fill test solution with funnel.

③ Drop the test solution from the funnel into the Rose-Miles test solution.

④ Record the initial bubble power and the bubble power after 1 minute.

[3. Surface tension]

1) Surface tension was measured using a surface tensioner manufactured by Kruss (Germany).

2) The surface tension measurement method was performed by using a ring after preparing the samples prepared in Examples 1 to 9 and Comparative Examples 1 to 7 in 0.1% aqueous solution.

[4. freezing point]

1) Measurement was performed using a low temperature circulator manufactured by HAAKE (Germany) and a mercury thermometer manufactured by Kumdo Chemical (Domestic) and certified by the Institute of Industrial Technology.

2) In the freezing point measuring method, the samples prepared in Examples 1 to 9 and Comparative Examples 1 to 7 were measured in a stock solution state.

The above test results are shown in Table 2 below.

TABLE 2

As shown in Table 2, the leather degreasing agent composition of the present invention was superior in degreasing power, lower foaming force and freezing point than the conventional surfactant, significantly increased workability.

In the case of Comparative Example 1, tributyl phosphate does not have a degreasing power, but in the state in which 5 to 15 parts by weight of tributyl phosphate is mixed with a nonionic surfactant as in Examples 1 to 9, a sharp synergistic effect of degreasing power was shown. It has been shown to increase the degreasing power due to its ability to penetrate, emulsify and disperse the surfactant into the tallow by interacting with the surfactant. However, when the content of tributyl phosphate is high, as in Comparative Example 6, the interaction is reduced, the phosphate is combined with the carboxyl group of the tallow, and the content of the surfactant is relatively low, so that the wettability is reduced, so that the degreasing power is reduced. When the tributyl phosphate content is low as in Comparative Example 7, there is no interaction, so the emulsification, penetration, and dispersing power are lowered.

Claims (3)

Leather degreasing agent composition containing 85 to 95 parts by weight of polyoxyethylene alkylphenol-based nonionic surfactant and 5 to 15 parts by weight of tributyl phosphate. 2. The leather degreasing agent composition according to claim 1, wherein the nonionic surfactant is selected from polyoxyethylene phenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene lauryl alcohol ether, polyoxyethylene alkyl ether or polyoxyethylene oleic acid ester. 2. The leather degreasing agent composition according to claim 1, wherein the nonionic surfactant is polyoxyethylene nonylphenyl ether (ethylene oxide added mole number 8 to 10) or polyoxyethylene octyl ether (ethylene oxide added mole number 8 to 10).