CN1381641A

CN1381641A - Method for decolouring yak hair

Info

Publication number: CN1381641A
Application number: CN02119691A
Authority: CN
Inventors: 马乙布拉; 韩国辉; 马乙四哈格; 马有福; 马明清; 吴延云
Original assignee: XUEZHOU THREE-FLANNEL GROUP QINGHAI
Current assignee: XUEZHOU THREE-FLANNEL GROUP QINGHAI
Priority date: 2002-05-18
Filing date: 2002-05-18
Publication date: 2002-11-27
Anticipated expiration: 2022-05-18
Also published as: CN1164825C

Abstract

A process for decolouring yak hair includes such steps as pre-treating with ferrous sulfate (5-8%), tarter emetic (1.5-3%) and industrial salt (18-24%) at 50-70 deg.C for 20-40 min, flushing with cold water; oxidation bleaching with H2O2 (15-30%) and sodium pyrophosphate (3-5%) at 50-70 deg.C for 50-70 min, flushing; reductive bleaching with whitening agent at 45-55 deg.C for 15-35 mmin, flushing; softening with softening agent at 15-25 deg.C for 25-35 min; dewatering and baking dry. The bath ratis is 1:10 and the pH is controlled at 4.5-5.

Description

A kind of method for decolouring yak hair

Technical field: the discoloration method that the present invention relates to a kind of yakwool.

Background technology: the yakwool main product belongs to special animal fiber in the Qinghai-Tibet Platean, has the goat cashmere characteristic, sliding glutinous, soft, fine and smooth, good springiness, extremely efficient in preserving heat.Generally between 17um-20um, fineness disperses between 30%-34% the yakwool fineness, and length is generally between 28-35mm.Yakwool more than 95% is dark brown and black, and its true qualities are natural strong looks, and COLOR FASTNESS is very firm.This be because the color of organic colored material molecule by chromophore in the molecular structure because of causing.Existing people adopt following technology to decolouring yak hair is general: former suede cleans (hair detergent 6-10%, industrial soda 3-5%) → add chemical assistant (35% hydrogen peroxide 15%, sodium bicarbonate 5%, sodium pyrophosphate 12%, ferrous sulfate 10%, sodium formaldehyde sulfoxylate 15%, brightening agent 8%) → be warming up to 50-60 minute → flushing with clean water → dewatered drying of 90 ℃ → insulation.Bath raio 1: 12-16.Adopt this technology good decolorizing effect, decolouring evenly, but bigger to the damage of yakwool filament, fibrous fracture and fibre length damage are generally between 10%-16%.Simultaneously, destroy serious to yakwool fiber surface scale structure.The feel hardening has harsh feeling, has lost some characteristic of yakwool to a certain extent.Because fibre damage is serious, make decolouring finished product suede row yielding low, just increase product cost, wasted resource.

The content of invention: the objective of the invention is to provide a kind of not only can be for yakwool effectively decolours, and reduce the yakwool damage greatly and destroy, effectively reduce the method for decolouring yak hair of decolouring cost.

Technical scheme of the present invention is: the characteristics of this yakwool decolouring velvet figures method are that its technological process is:

One, pre-treatment (oxidizing process)

Ferrous sulfate 5-8%, tartar emetic 1.5-3%, Nacl 18-24%, time 20-40 minute, use cold water flush again by temperature 50-70 ℃;

Two, oxidation bleaching (oxidation-reduction process)

35% hydrogen peroxide 15-30%, sodium pyrophosphate 3-5%, time 50-70 minute, use cold water flush again by temperature 50-70 ℃;

Three, reducing bleach

Brightening agent 2-5%, temperature 45-55 ℃, time 15-35 minute, flushing then;

Four, soft treatment

Softener 3-5%, temperature 15-25%, time 25-35 minute, PH4.5;

At last, dehydration, oven dry.The ratio of chemical assistant is to calculate by the weight of the yakwool that drops in the above-mentioned technical process; Bath raio is 1: 10 in above-mentioned technical process; PH is controlled at 4.5-5.Device therefor is the variegated machine of hair that looses.

Another characteristics of the present invention are to also have one to clean ox suede technology before described pre-treatment process, are about to the liquid that raw material ox suede places the remover of 8%-15%, clean temperature 50-60 ℃ 20-60 minute.

Advantage of the present invention and effect are: at first, realized decolouring yak hair, made yakwool change into white or light gray by dark brown.Secondly, make monofilament strength, fracture and the length damage of yakwool be reduced to minimum level as compared with the past.Fibre damage has only 3-4%, and the yakwool scale structure does not have distortion, has improved fiber fineness and brightness, does not lose the imitating property of yakwool fiber, and feel is sliding glutinous, fine and smooth, and can reach the dyeing necessary requirement.Once more, because damage ratio greatly reduces,, reduced cost so also just improved the row yielding of decolouring ox suede.At last, because the successful decolouring of yakwool, and then thoroughly changed black and brown ox suede product, and make the ox suede product can dye shades of colour, so just widen yakwool research and development of products thinking, thereby produced the more yakwool product of multi-color kind.

The specific embodiment: raw material is clean yakwool in embodiment 1:(following examples)

1, pre-treatment: 70 ℃ in ferrous sulfate 5%, tartar emetic 1.5%, Nacl 18%, temperature, 40 minutes time, cold water flush then;

2, oxidation bleaching: hydrogen peroxide (35%) 15%, sodium pyrophosphate 3%, 70 ℃ of temperature, 70 minutes time, flushing then;

3, reducing bleach: brightening agent 2%, 55 ℃ of temperature, 35 minutes time;

4, soft treatment: softener 3%, 25 ℃ of temperature, 35 minutes time, PH4.5;

5, dehydration, oven dry, packing.

Embodiment 2:

1, pre-treatment: ferrous sulfate 6.5%, tartar emetic 2%, Nacl 22%, 60 ℃ of temperature, 30 minutes time, cold water flush;

2, oxidation bleaching: hydrogen peroxide (35%) 20%, sodium pyrophosphate 4%, 60 ℃ of temperature, 60 minutes time, flushing then;

3, reducing bleach: brightening agent 3%, 50 ℃ of temperature, 25 minutes time, flushing then;

4, soft treatment: softness 4%, 20 ℃ of temperature, 30 minutes time, PH4.5;

5, dehydration, oven dry, packing.

Embodiment 3:

1, pre-treatment: ferrous sulfate 8%, tartar emetic 3%, Nacl 24%, 50 ℃ of temperature, 20 minutes time, cold water flush;

2, oxidation bleaching: hydrogen peroxide (35%) 30%, sodium pyrophosphate 5%, 50 ℃ of temperature, 50 minutes time, flushing then;

3, reducing bleach: brightening agent 5%, 45 ℃ of temperature, 15 minutes time;

4, soft treatment: softener 5%, 15 ℃ of temperature, 25 minutes time, PH4.5;

5, dehydration, oven dry, packing.

Claims

1, a kind of method for decolouring yak hair is characterized in that its technological process is:

One, pre-treatment: ferrous sulfate 5-8%, tartar emetic 1.5-3%, Nacl 18-24%,, time 20-40 minute, use cold water flush again by temperature 50-70 ℃;

Two, oxidation bleaching: 35% hydrogen peroxide 15-30%, sodium pyrophosphate 3-5%,, time 50-70 minute, use cold water flush again by temperature 50-70 ℃;

Three, reducing bleach: brightening agent 2-5%, temperature 45-55 ℃, time 15-35 minute, flushing then.

Four, soft treatment: softener 3-5%, temperature 15-25 ℃, time 25-35 minute, PH4.5;

At last, dehydration, oven dry; The ratio of chemical assistant is to calculate by the weight of the yakwool that drops in the above-mentioned technical process; Bath raio is 1: 10 in above-mentioned technical process; PH is controlled at 4.5-5.

2, a kind of method for decolouring yak hair as claimed in claim 1 is characterized in that also having before described pre-treatment process one to clean ox suede technology, is about to the liquid that the raw material yakwool places the 8%-15% remover, cleans temperature 50-60 ℃ 20-60 minute.