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Two-bath dyeing method for superfine fiber synthetic leather

A technology of superfine fiber and dyeing method, which is applied in the field of dyeing process of synthetic leather, which can solve the problems of not being able to meet the high-end market, dyes are easy to fall off, and dry and wet rubbing fastness is low.

Inactive Publication Date: 2017-01-04
HUAFON MICROFIBER SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of its ultra-fine fibers, the specific surface area of ​​the fiber is large, the color rendering is poor, and the dyes absorbed are easy to fall off, so the dry and wet rubbing fastness of conventional one-bath dyeing is low, especially the wet rubbing fastness, which can only be achieved by dark varieties. Grade 1 is far from meeting the requirements of the high-end market. Therefore, improving the dry and wet rubbing fastness of microfiber synthetic leather is an inevitable trend of market development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Pretreatment process

[0030] Put the superfine fiber synthetic leather into the high temperature and high pressure overflow dyeing machine, add 6g / L scouring agent, the bath ratio is 1:10, the temperature is 70°C, and the liquid is drained after scouring for 30 minutes.

[0031] The scouring agent in the step (1) is a commercial product, the scouring agent DM-1324 of Demei Chemical.

[0032] (2) dyeing process

[0033] Sulfur dye dyeing: add sulfur dye 3% (o.w.f.) and caustic soda 1g / L at room temperature, liquor ratio 1:5, run for 15 minutes and then heat up, 1°C / min to 60°C, then add hydrosulfite 5g / L and caustic soda 1g / L The mixture was kept warm for 30min, drained and washed with 0.1g / L acetic acid and 1.5g / L H 2 o 2 (35%) Oxidation at 50°C for 30min, then soaping agent SN-S 0.5g / L, soaping at 90°C for 30min to drain.

[0034] Acid dye dyeing: Add 1% (o.w.f.) acid dye at room temperature, 1% (o.w.f.) leveling agent, 0.5g / L acetic acid, 0.1g / L defoamer, liq...

Embodiment 2

[0041] (1) Pretreatment process

[0042] Put the superfine fiber synthetic leather into the high temperature and high pressure overflow dyeing machine, add 9g / L scouring agent, the bath ratio is 1:40, the temperature is 80°C, and the liquid is drained after scouring for 60 minutes.

[0043] The scouring agent is DM-1324 from Demei Chemical.

[0044] (2) dyeing process

[0045] Sulfur dye dyeing: add sulfur dye 8% (o.w.f.) and caustic soda 3g / L at room temperature, bath ratio 1:15, run for 20 minutes and then heat up, 3°C / min to 85°C, then add hydrosulfite 15g / L and caustic soda 2g / L The mixture was kept warm for 60min, drained and washed with 1g / L acetic acid and 3.5g / L H 2 o 2 (35%) Oxidation at 70°C for 60min, then soaping agent SN-S 2g / L, soaping at 100°C for 60min to drain.

[0046] Acid dye dyeing: add acid dye 5% (o.w.f.) at room temperature, leveling agent dosage is 3% (o.w.f.), acetic acid dosage is 2g / L, defoamer dosage is 0.5g / L, bath ratio 1:15, 110℃ After heat...

Embodiment 3

[0053] (1) Pretreatment process

[0054] Put the superfine fiber synthetic leather into the high temperature and high pressure overflow dyeing machine, add 8g / L scouring agent, the bath ratio is 1:20, the temperature is 75°C, and the liquid is drained after scouring for 45 minutes.

[0055] The scouring agent is DM-1324 from Demei Chemical.

[0056] (2) dyeing process

[0057]Sulfur dye dyeing: Add sulfur dye 6% (o.w.f.) and caustic soda 2g / L at room temperature, liquor ratio 1:10, run for 18 minutes and then heat up, 2°C / min to 70°C, then add hydrosulfite 10g / L and caustic soda 1.5g / L of mixed solution, keep warm for 50min, wash with 0.5g / L acetic acid and 2g / L H 2 o 2 (35%) Oxidation at 60°C for 45min, then soaping agent SN-S 1g / L, soaping at 95°C for 45min to drain.

[0058] Acid dye dyeing: Add acid dye 3% (o.w.f.) at room temperature, leveling agent dosage 2% (o.w.f.), acetic acid dosage 1g / L, defoamer dosage 0.3g / L, bath ratio 1:10, 100℃ After heat preservation for...

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Abstract

The invention provides a two-bath dyeing method for superfine fiber synthetic leather. The method sequentially comprises the steps of 1, pretreatment of the superfine fiber synthetic leather; 2, dyeing of the superfine fiber synthetic leather; 3, after treatment of the superfine fiber synthetic leather. The dyeing method comprises the steps of 1, placing the pretreated superfine fiber synthetic leather in a dyeing bath containing sulfur dyestuff and caustic soda, conducting operation at room temperature, then increasing temperature, adding a sodium hydrosulfite and caustic soda mixed solution, conducting heat insulation for 30-60 min, conducting washing on drained liquid, then conducting oxidization with acetic acid and H2O2, conducting soaping with a soaping agent, and conducting liquid drainage; 2, adding acid dyestuff, a levelling agent, acetic acid and a defoamer at room temperature, conducting heat insulation and washing, and conducting fabric discharging and drying. It is found through testing (testing standard of ISO 105x12-2001) of crockfastness of the dyed superfine fiber synthetic leather that dry rubbing crockfastness can reach 4-5 grade, wet rubbing crockfastness can reach 3-4 grade, and requirements of high-end clients are met.

Description

technical field [0001] The invention relates to a dyeing process of synthetic leather. Background technique [0002] Microfiber synthetic leather is a new type of high-grade artificial leather made of extremely fine nylon fibers. It can be used in shoes, bags, furniture, car interiors and other fields. It has the characteristics of genuine leather and has superior indicators than genuine leather. Polyurethane synthetic leather based on three-dimensional network structure superfine fiber nonwoven fabric is a new generation of synthetic leather developed in recent years. Some people call it the fourth generation of artificial leather. It is comparable to high-grade natural leather and has the inherent characteristics of natural leather. Excellent moisture absorption and breathability, and surpasses natural leather in terms of chemical resistance, waterproof, and mildew resistance. However, due to the characteristics of ultrafine fibers, the specific surface area of ​​the fibe...

Claims

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Application Information

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IPC IPC(8): D06P1/39D06P1/613D06P1/651D06P1/653D06P1/673D06P3/24D06P5/04D06P5/08
CPCD06P1/39D06P1/613D06P1/65125D06P1/6533D06P1/6735D06P3/241D06P5/04D06P5/08
Inventor 胡忠杰段伟东张其斌孙向浩韩芹胡雪丽杜明兵
Owner HUAFON MICROFIBER SHANGHAI
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