CS237740B1 - Agent for surface treatment of leather grains - Google Patents

Abstract

The invention relates to surface problems treatment of leather in tanning operations. The purpose of the invention is to achieve this called wax finishes of the leather improved suppleness, waxy touch and a more brilliant shade in coloring, respectively increasing the resistance values for dry and wet, as well as abrasion resistance wet. This purpose is achieved if is applied to the leather coatings a composition comprising 5 to 5% by weight 15 ¥ ethylene glycol fatty ester and wax acids with chain length C16 "C30" 3 Majority of acid 3 to 3 ¥ 3 ¥ oil; 0.5 to 1.5 ¥ neutralizing agent; 1 to 3 ¥ emulsifier and 77.5 to 92.5 ¥ of water, with this oil-like oil contains rapeseed oil and as a neutralizing agent triethanolamine.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for the surface treatment of leather, based on an aqueous wax dispersion, and to an oil additive, a neutralizing agent and an emulsifier.

The natural character of the face of the leather is best suited to the skin, or even emphasized by means of light treatments, which include aniline or seaianiline treatment, or a treatment which imparts a characteristic waxy touch to the face of the leather. The desired effect is achieved by adding a wax dispersion to the final finishing coating on the leather face. Subsequently, the leather is then ironed at an elevated temperature, whereby the wax contained in the dried dispersion is melted and recooled to form a thin, uniformly distributed layer on the leather surface.

In addition to the desired waxy feel, the leather thus treated also excel in the smoothness of the face surface and increased water resistance.

The basic component of these wax dispersions is carnauba wax, containing predominantly carnauba ester together with myricilium cerotane and up to 55% of unsaponifiable matter, attributed to 48-55% by weight of resin substances, which not only cause undesirable dark coloration of carnauba wax but also its relative hardness, as well as the fragility of the resulting uani film.

These drawbacks do not occur in the face-dressing composition, based on an aqueous wax dispersion, with an admixture of oil, a neutralizing agent and an emulsifier, the subject of the present invention comprising 5 to 15% by weight of ethylene glycol astar of fatty and waxy acids. chain length C ₁₈ to C ₁₈ , with predominantly montanic acid ^G 28 56 56 ° 2 '3 oleje oil; 0.5 to 1.5% neutralizing agent; 1 to 3% emulsifier and 77.5 to 92.5% water. Most preferably, the composition according to the invention is when the composition comprises rapeseed oil as oil and triethanolamine as neutralizing agent.

Advantages of the present invention are the improved smoothness of the treated leather, which also exhibits a smoother, more waxy feel and a brilliant shade of color. In most cases, these beneficial factors are manifested by increased dry and wet bending values as well as wet abrasion resistance.

The original, light yellow color of the wax component in the composition according to the invention is also beneficial when the leather is turned to light shades of the cheek. Both of the latter effects will be illustrated in the descriptive part of the invention by values arranged in two tables.

The inventive leather-finishing composition according to the invention contains up to 15% by weight to 3% by weight.

0.5 to 1.5% to 3%

77.5 to 92.5% water.

Ointments and etyle'nglykolového ester wax acids of chain length C g to C _0, in which prevails montanic acid ^C 28 ^H 56 ° 2 'oils, in particular rapeseed oil, neutralizing agent, particularly triethanolamine, emulsifier, especially mixtures of ethoxylated fatty alcohols and

A suitable ethylene glycol ester of fatty and waxic acids having a chain length of ^c 16 ^{to C} 30 synthetic wax of the trade name wax Ej from an emulsifier are those marketed under the trade name Senex 720 or Stoxon EPA.

The composition according to the invention can be used, in addition to the surface treatment of leather with wax feel of the cheek, 1 in basic finishing solutions in the surface treatment of cut leather, where it causes a partial closure of the leather surface, or decreases the suction of the finish and thereby increases the hiding power of subsequent color finishes. In the surface treatment of full grain leather or ground leather, it can be used in top dressings applied by spraying, where it increases the suppleness of the dressing and its water resistance.

It also facilitates work during polishing and ironing, as the wax contained in the product melts and forms a uniform layer on the surface of the leather, as a result of which the friction and polishing of the iron are reduced. The preparation can be used with the mentioned advantages also in finishing with water systems for flexible flat materials such as artificial leather, artificial lining etc.

Here are some examples:

Example 1

A weighed amount of triethanolamine and Renex 720 (ethoxylated higher fatty alcohol) emulsifier was added to the molten wax (wax E} ethylene glycol fatty acid wax ester C 1 to C 1 g) and the mixture was heated to 105 ° C. An appropriate amount of water was heated to boiling and the mixture was dispersed in the water with stirring. Stirring was continued until the dispersion was cooled to 40 ° C. The prepared dispersion had the following composition in weight percent:

Wax I 9% Rape oil 2% Triethanolamine 1% Renex 720 2% Water 86%

Example 2

By the procedure analogous to 3 of Example 1, a preparation for the surface treatment of leather of the following composition was prepared:

Wax E (chain length ethyl ester glycol ester of fatty and waxy acids)

C ₁₆ to ₃₀ ) rapeseed oil 1% potash 0,5% Etoxone EPA 1% Water 92,5%.

Example 3

Wax E (chain length ethylene glycol ester of fatty and waxy acids)

C, _{6 to} C ₃₀ ) 15 »coconut oil 3% triethanolamine 1.5% Renex 720 3 * water 77.5%

Table 1 shows the results of evaluating some of the parameters of the leather treated with the composition of the invention (B) compared to the treatment using carnauba wax (A).

Table 1

Marking of leather Dry bending resistance (a) Wet resistance (b) Wet abrasion resistance c) AND (B) AND (B) AND (B) Normal black 3.00 3.05 3.00 3.00 5.0 5.0 Normal white 2.62 3.15 2.60 2.82 4.0 4.3 Normal Madeira 3.00 3.15 2.87 2.87 5.0 5.0 Qlowe Maple 3.12 3.37 2.12 2.62 5.0 5.0 Olowe Texas 3.00 3.00 2.12 2.37 5.0 5.0

ČSN 79 2231, ČSN 79 3855, ČSN 79 3853, ČSN 79 2242 and regulations SZ 209.

Exact wording:

a) Resistance to dry bending treatment according to ČSN 79 3855.

b) Resistance to repeated bending of the wet adjustment according to ČSN 79 3855. o) Stability of the wet wiping treatment according to ČSN 79 3853.

ČSN 79 3855 is too rigorous in requiring a value of 3 in the requirement for resistance to repeated bending and wet treatment; as also shown in Table 1 in column A, this value is rarely achieved in practice and a comparison with the values in column B according to the invention shows that there is a significant improvement. However, for some types of adjustments, such as Normal Madeira or Kempua Colonial, however, the value is 3 and the rating is: A = 2.90; B »3.10; A »2.50; B 3,00:

Table 2 shows some physical quantities for carnauba wax and wax E.

Table 2

Type of wax Melting point (° C) iodine number Color to Carnauba wax 80 to 86 7 to 15 dark brown Wax S 79 to 82 17 to 25 light yellow

Wax S - an ethylene glycol ester of fatty and waxic acids of chain length C, g to Cj ₀ , predominantly montanoic acid ^C 28 ^H 56 ° 2 ·

Carnauba wax - this is a mixture of wax esters (80 to 81 56), free rasteric acids (1 to 1, 56), lactones (3-5 to 56), free wax alcohols' (6 56), free polyhydric alcohols (1 to 256), hydrocarbons (less than 1556) and resinous phytosterols (3-456). ,.

The perception effect of the leather finish obtained by the composition of the invention was subjected to subjective testing in a set of twenty halves, of which it was treated with a carnauba wax preparation and ten with a composition of the invention. The assembly was presented to a sorter, which divided it into two qualitatively different groups, and after checking the labeling, it was found that in the qualitatively better rated group there were nine halves pMi with the aid of the composition of the invention.

A scale of 0, 1 point was used for the quality evaluation when the whole scale is in the range of 0 to 2.

Cheek character: Coarse, contracted, rough to unpleasant

- Face character: Smooth over the entire surface, not drawn

- Character face: Perfect smooth across the surface, pleasant to the touch.

Claims (2)

OF THE INVENTION CLAIMS 1. A surface-treatment composition for the leather side, based on an aqueous wax dispersion and oil admixtures, a neutralizing agent and an emulsifier, characterized in that it contains 5 to 5% by weight of an ethylene glycol fatty acid wax ester having a chain length of C18 to C18. % of montanic acid ^C 28 ^H 56 ° 2 ' ¹ 56 oil 0.5 to 1.55 neutralizing agent; 1 to 35 of the emulsifier and 77.5 to 92.5 of water. ² 2. Composition according to claim 1, characterized in that it comprises rapeseed oil as oil and triethanolamine as neutralizing agent.