Unstable island type PA6/PU suede superfine fiber synthetic leather pad-dyeing process by using vat dye

A superfine fiber and synthetic leather technology, applied in the field of acrylic fiber processing, can solve the problems of unsatisfactory vat dye dyeing effect, low dyeing rubbing fastness and soaping fastness, increased cohesive energy, etc., and achieves the distribution of microporous structure. The effect of uniform preservation, prevention of excessive local temperature, and favorable infiltration

Inactive Publication Date: 2013-12-18
SHANDONG VOCATIONAL COLLEGE OF LIGHT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical difficulties in the dyeing of existing microfiber leather are as follows: 1. Rare deep color: Due to the ultra-fine structure of the fiber, its cohesive energy increases, and it is difficult for dyes to enter the fiber, and it is difficult to obtain a deep color
Ultrafine polyamide fibers and polyurethane are closely connected together, and the proportion of crystallization area is relatively large, so it is difficult for dye to penetrate, resulting in lighter color
2. Low color fastness: Even if some dyes can be dyed into the interior of the fiber temporarily, they will be free to the surface of the fiber during the placement process, causing a decrease in the color fastness to rubbing and wet treatment
3. Uneven dyeing: the fiber fineness is too small, the specific surface area is large, and the dye adsorption rate is high, which is the main cause of uneven color yield
Using the existing dyeing technology and using neutral dyes or / and disperse dyes to dye superfine fiber synthetic leather can not meet the use requirements of high-end hotels and hotels for chlorine bleaching resistance
[0006] Although vat dyes have good chlorine bleaching properties, there are still the following technical difficulties in using vat dyes to pad-dye PA6 / PU ultrafine fiber synthetic leather in the prior art: first, use existing neutral dyes and disperse dyes to pad-dye When the dyeing process is combined with vat dyes, when the PA6 / PU superfine fiber synthetic leather is pad-dyeed, because the pad dyeing process does not match the vat dyes, the dyeing effect of PA6 / PU superfine fiber synthetic leather using vat dyes is not ideal; secondly, When the composition and proportion of the existing reducing system are combined with vat dyes to pad-dye PA6 / PU superfine fiber synthetic leather, the rubbing fastness and soaping fastness of dyeing are low

Method used

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  • Unstable island type PA6/PU suede superfine fiber synthetic leather pad-dyeing process by using vat dye
  • Unstable island type PA6/PU suede superfine fiber synthetic leather pad-dyeing process by using vat dye
  • Unstable island type PA6/PU suede superfine fiber synthetic leather pad-dyeing process by using vat dye

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Examples 1 to 3 are specific implementations of the vat dye pad dyeing process for indeterminate island type PA6 / PU suede superfine fiber synthetic leather of the present invention, and Example 1 is the best implementation. Embodiment 1~3 pad dyeing process prescription, see Table 2.

[0032] Table 2 Example 1~3 Pad Dyeing Process Prescription

[0033]

[0034] Example 1

[0035] The indeterminate island type PA6 / PU suede superfine fiber synthetic leather obtained in Example 1 is light beige, and the color is prepared by using three kinds of vat dyes, vat brown GG~M, vat gray BGL, and vat yellow G.

[0036] In this embodiment, the indeterminate island type PA6 / PU suede superfine fiber synthetic leather vat dye pad dyeing process is characterized in that it includes the following steps:

[0037] Padding dyeing solution→infrared pre-baking→drying→baking→pad reducing solution→steaming→water washing→oxidation 3 times→soaping 2 times→water washing 2 times→drying;

[003...

Embodiment 2

[0046] The indeterminate island type PA6 / PU suede superfine fiber synthetic leather obtained in Example 2 is light beige, which is formulated with three kinds of vat dyes: vat olive green B, vat yellow G, and vat bright green FFB.

[0047] In this embodiment, the indeterminate island type PA6 / PU suede superfine fiber synthetic leather vat dye pad dyeing process is characterized in that it includes the following steps:

[0048] Padding dyeing solution→infrared pre-baking→drying→baking→pad reducing solution→steaming→water washing→oxidation 2 times→soaping 2 times→water washing 2 times→drying;

[0049] Among them, the padding dyeing solution: the padding method is one dipping and one padding, the padding temperature does not exceed 30°C, and the padding rate is 60%. The composition of the dyeing solution is vat dye and anti-swimming agent CTC-490; of vat dyes for fineness 2μm hollow dust-proof granular vat dyes.

[0050] Drying: The temperature is 113~115°C.

[0051] Baking: ...

Embodiment 3

[0057] The indeterminate island type PA6 / PU suede superfine fiber synthetic leather obtained in Example 3 is light beige, which is formulated by using three kinds of vat dyes: vat brilliant blue RSN, vat dark blue VB, and vat brilliant green FFB.

[0058] In this embodiment, the indeterminate island type PA6 / PU suede superfine fiber synthetic leather vat dye pad dyeing process is characterized in that it includes the following steps:

[0059] Padding dyeing solution→infrared pre-baking→drying→baking→pad reducing solution→steaming→water washing→oxidation 4 times→soaping 2 times→water washing 2 times→drying;

[0060] Among them, the padding dyeing solution: the padding method is one dipping and one padding, the padding temperature does not exceed 30°C, and the padding rate is 70%. The composition of the dyeing solution is vat dye and anti-swimming agent CTC-490; of vat dyes for fineness 2μm hollow dust-proof granular vat dyes.

[0061] Drying: The temperature is 110~112°C.

...

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Abstract

The invention belongs to the technical field of acrylic fiber processing and mainly relates to an unstable island type PA6 / PU (Polyamide / (Poly Urethane) suede superfine fiber synthetic leather pad-dyeing process by using a vat dye. The unstable island type PA6 / PU suede superfine fiber synthetic leather pad-dyeing process by using the vat dye provided by the invention is capable of obtaining the unstable island type PA6 / PU suede superfine fiber synthetic leather through pad dyeing through the following steps: preparing a dyeing liquor by compounding the vat dye with an anionic migration inhibitor, compounding a reducing liquid from sodium hydrosulphite and caustic soda, and taking hydrogen peroxide as an oxidating liquid, and then carrying out the process flow of padding in the dyeing liquid, infrared predrying, drying, baking, padding in the reducing liquid, steaming, water washing, oxidizing for 2-4 times, twice soap-boiling, twice water washing and drying. The unstable island type PA6 / PU suede superfine fiber synthetic leather obtained through the pad-dyeing process provided by the invention has excellent color fastness to light, excellent color fastness to washing, excellent crockfastness and excellent chlorine bleaching resistance.

Description

technical field [0001] The invention relates to pad dyeing process of indeterminate island type PA6 / PU suede superfine fiber synthetic leather with vat dye, which belongs to the technical field of acrylic fiber processing. Background technique [0002] The indeterminate island type PA6 / PU suede superfine fiber synthetic leather referred to in this patent is made of polyamide 6 (PA6) and low-density polyethylene (LDPE) as raw materials, blended and melt-spun in a certain proportion to obtain a single fiber Indeterminate island-type sea-island fiber of 5~6 dtex; then make it into high-density needle-punched nonwoven fabric; finally, the base fabric is impregnated with polyurethane resin (polyurethane) by wet method, cured, reduced in weight and deseaved Fiber, fleece, and finally form a sheet-like suede material that is integrated with a bundle of ultra-fine fibers and a polyurethane sponge network with an open microporous structure. Its composition is PA650% and PU50%, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/22D06P1/44D06P3/85D06P5/10D06P5/02D06B21/00
Inventor 陈英华翟纯江许兵于子建
Owner SHANDONG VOCATIONAL COLLEGE OF LIGHT IND
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