Sharing of production process of waterborne polyurethane wet reclaimed leather!

1、：

1.

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1.

1.

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3 Coagulation: the flocking bovine fiber substrate coated with foaming slurry is coagulated through the coagulation liquid in the coagulation tank to demulsify the water-based polyurethane and form a porous filler together with lignocellulose, kaolin and nano-calcium carbonate.
In the flocking bovine fiber substrate.

2.
4 Washing and drying: remove excess agglomerate through the washing tank, dry and finalize to obtain water-based regeneration Pebes.

2.
5 Dry veneer: Coat the water-based surface layer slurry on the release paper, the coating amount is 220g/m2, oven drying at 110℃, and the middle layer slurry is coated, the coating amount is 200g/m2, 130°C oven Drying, second coating the middle layer slurry, the coating amount is 200g/m2, and finally using the water-based recycled Pebes for laminating, drying, and peeling off the release paper to obtain water-based polyurethane recycled leather.

Example 2

A method for preparing water-based polyurethane reclaimed leather by wet method includes the following steps:

1.
Ingredients:

1.
1 Preparation of impregnating solution: Take 25kg of water-based polyurethane resin HY-0325F (Hefei Huayue New Material) and 1.
5kg of penetrant JFC with a solid content of 42%, add it to 75kg of tap water, stir evenly at high speed, and obtain the impregnating solution.

1.
2 Preparation of agglomerate liquid: Take 3kg of lactic acid, 1kg of citric acid and 96kg of tap water and mix and stir to make the lactic acid and citric acid completely dissolve in the water.

1.
3 Preparation of foaming slurry: Take 200kg of waterborne polyurethane resin HY-0325F (Hefei Huayue New Material) with a solid content of 42%, and add 1kg of dispersant A168, 7kg of lignocellulose (Yixing Shengdeli), 5kg nano calcium carbonate (Henan Keli New Material), 2.
5kg 1250 mesh kaolin, 3.
5kg foaming agent K12 (Jinan Shuochang Chemical), 3.
5kg foam stabilizer 207 (Qingdao Zhongbao Chemical), 1kg curing agent XP2655 (Bayer, Germany) and 0.
7kg of cellulose-type thickener (Texas Weiss) are stirred with a high-speed mixer and foamed to 1.
3 times the original volume to obtain a foamed slurry.

1.
4 Preparation of water-based surface layer slurry: take 100 kg of water-based polyurethane resin HY-0303Q (Hefei Huayue New Material) with a solid content of 35%, and add 0.
8 kg of defoamer CF247 (Clariant Chemicals) and 0.
8 kg of wetting agent in turn TEGO245, 4kg of wear-resistant additive DC51 (Dow Corning, USA), 8kg of nano calcium carbonate (Henan Keli New Material), 4kg of wear-resistant wax powder E360 (Wengkaier) and 1.
2kg of water-based thickener 3220 (Shenzhen) Haichuan Chemical), use a high-speed mixer to disperse evenly, with a viscosity of 3500m Pa·s, to obtain an aqueous surface layer slurry.

1.
5 Preparation of the middle layer slurry: Take 100kg of aliphatic waterborne polyurethane resin HY-1015T (Hefei Huayue New Material) with a solid content of 35%, and add 0.
8kg of defoamer CF247 (Clariant Chemicals) and 7kg of nano calcium carbonate in turn (Henan Keli New Material), 0.
5kg wetting agent TEGO270, 0.
8kg water-based thickener 3220 (Shenzhen Haichuan Chemical), disperse uniformly with a high-speed mixer, and the viscosity is 6200m Pa·s to obtain the middle layer slurry.

2.
Preparation of waterborne polyurethane space leather:

2.
1 Base fabric treatment: the flocking cattle fiber substrate is first dipped through the dipping liquid in the dipping tank, and then coagulated through the coagulation tank, squeezed with a three-platen machine, and dried in an oven at 120°C.

2.
2 Coating: Coating foaming slurry on the treated flocking bovine fiber substrate, the coating amount is 620g/m2.

2.
3 Coagulation: the flocking bovine fiber substrate coated with foaming slurry is coagulated through the coagulation liquid in the coagulation tank to demulsify the water-based polyurethane and form a porous filler together with lignocellulose, kaolin and nano-calcium carbonate.
In the flocking bovine fiber substrate.

2.
4 Washing and drying: remove excess agglomerate through the washing tank, dry and finalize to obtain water-based regeneration Pebes.

2.
5 Dry veneer: Coat the water-based surface layer slurry on the release paper, the coating amount is 220g/m2, oven drying at 120°C, and the middle layer slurry is coated, the coating amount is 200g/m2, 120°C oven Drying, secondary coating of the middle layer slurry, the coating amount is 200g/m2, and finally the water-based recycled Pebes is used for laminating, drying, and peeling off the release paper to obtain the water-based polyurethane recycled leather.

Example 3

A method for preparing water-based polyurethane reclaimed leather by wet method includes the following steps:

1.
Ingredients:

1.
1 Preparation of impregnating solution: Take 25kg of water-based polyurethane resin HY-0325F (Hefei Huayue New Material) with a solid content of 42% and 2kg of penetrant JFC into 76kg of tap water, stir evenly at high speed to obtain the impregnating solution.

1.
2 Preparation of agglomerate solution: Take 3kg of iron sulfate and 97kg of tap water and mix and stir to completely dissolve the iron sulfate in the water.

1.
3 Preparation of foaming slurry: Take 200kg of water-based polyurethane resin HY-0325F (Hefei Huayue New Material) with a solid content of 42%, and add 0.
5kg of dispersant A168 and 10kg of lignocellulose (Yixing Shengdeli).
, 3kg of nano calcium carbonate (Henan Keli New Material), 10kg of 1250 mesh kaolin, 4.
8kg of foaming agent K12 (Jinan Shuochang Chemical), 4.
8kg of foam stabilizer 207 (Qingdao Zhongbao Chemical), 1.
2kg of curing XP2655 (Bayer, Germany) and 0.
5kg of cellulose thickener (Wise, Texas) are stirred with a high-speed mixer and foamed to 1.
5 times the original volume to obtain a foamed slurry.

1.
4 Preparation of water-based surface layer slurry: take 100 kg of water-based polyurethane resin HY-0303Q (Hefei Huayue New Material) with a solid content of 30%, and add 0.
3 kg of defoamer CF247 (Clariant Chemicals) and 0.
7 kg of wetting agent in turn TEGO245, 5kg of wear-resistant additive DC51 (Dow Corning, USA), 7kg of nano calcium carbonate (Henan Keli New Material), 2kg of wear-resistant wax powder E360 (Wengkaier) and 0.
5kg of water-based thickener 3220 (Shenzhen) Haichuan Chemical), use a high-speed mixer to disperse evenly, with a viscosity of 2400m Pa·s, to obtain an aqueous surface layer slurry.

1.
5：100kg35％HY-1015T()，0.
4kgCF247()、5kg()、0.
6kgTEGO270、0.
6kg3220()，，5800m Pa·s，。

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1：，，，120℃。

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2：，630g/m2。

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3：，、、，。

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4、：，。

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5：，200g/m2，100℃，，250g/m2，100℃，，150g/m2，，，，。

4

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1：25kg42％HY-0325F()、1.
5kgJFC75kg，，。

1 .
2：5kg95kg，。

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3：200kg42％HY-0325F()，1kgA168、9kg()、4kg()、7.
5kg  1250、5.
2kgK12()、5kg207()、1.
2kgXP2655()0.
5kg()，，1.
7，。

1.
4：30％HY-0303Q()80kg，0.
7kgCF247()、0.
5kgTEGO245、4kgDC51()、10kg()、3kgE360()0.
8kg3220()，，2900m Pa·s，。

1.
5：100kg35％HY-1015T()，0.
4kgCF247()、8kg()、0.
7kgTEGO270、0.
6kg3220()，，5800m Pa·s，。

2、：

2.
1：，，，120℃。

2.
2：，580g/m2。

2.
3：，、、，。

2.
4、：，。

2.
5 Dry veneer: Coat the water-based surface layer slurry on the release paper, the coating amount is 220g/m2, drying in 140℃ oven, and coating the middle layer slurry, the coating amount is 220g/m2, 140℃ oven Drying, secondary coating of the middle layer slurry, the coating amount is 180g/m2, and finally the water-based recycled Pebes is used for laminating, drying, and peeling off the release paper to obtain water-based polyurethane recycled leather.

Test results: According to the national standard QBT 4712-2014 "Polyurethane Synthetic Leather for Sofas", the performance test of the water-based polyurethane reclaimed leather prepared in the above 4 examples was carried out.
The test results are shown in Table 1.

As shown in Table 1, the water-based polyurethane reclaimed leather prepared in Examples 1 to 4 has excellent flatness, and the peel strength is far greater than the national standard requirements, indicating that the reclaimed leather has good bonding performance and the water-based polyurethane reclaimed leather has good abrasion resistance , The water-based polyurethane reclaimed leather prepared in Examples 1 to 4 has high peel strength, abrasion resistance, smooth surface and good hand feeling, which improves the grade of sofa leather.

The above are only preferred embodiments of the present invention and do not limit the present invention in any form or substance.
It should be pointed out that for those of ordinary skill in the art, without departing from the method of the present invention, they will be able to do Several improvements and supplements have been made, and these improvements and supplements should also be regarded as the protection scope of the present invention.
Anyone who is familiar with the profession, without departing from the spirit and scope of the present invention, can make use of the technical content disclosed above to make minor changes, modifications, and evolutionary equivalent changes, all of which are equivalent to the present invention.
Equivalent embodiments; at the same time, any changes, modifications and evolutions made to the above-mentioned embodiments based on the essential technology of the present invention are still within the scope of the technical solutions of the present invention.