Low odor polyurethane leather and method of making same

Abstract

The application discloses low-odor polyurethane artificial leather and a preparation method thereof. The polyurethane artificial leather comprises a base cloth layer, a PU bottom layer and a PU surface layer arranged in sequence. The PU surface layer comprises the following raw materials in parts by weight: 100 parts of water-based PUD resin, 1-10 parts of a crosslinking agent, 1-2 parts of a dispersing agent, 5-10 parts of a colorant and 1-5 parts of an adsorbent. The PU bottom layer comprises the following raw materials in parts by weight: 100 parts of polyurethane resin A, 90 parts of polyurethane resin B, 30-50 parts of a flame retardant, 1-5 parts of a catalyst and 1-5 parts of an additive. The adsorbent is composed of aluminum oxide, fumed silica and nanocellulose crystals. The application significantly reduces the odor of the polyurethane artificial leather, and the polyurethane artificial leather can meet the needs of automobile enterprises.

Description

Technical Field

[0001] This invention relates to the field of artificial leather technology, and more particularly to low-odor polyurethane artificial leather and its preparation method. Background Technology

[0002] Polyurethane artificial leather is a type of leather with a polyurethane outer layer, widely used for embellishing bags, clothing, shoes, vehicles, and furniture. However, organic compounds are generated during the production of polyurethane artificial leather. Based on their boiling points, these compounds can be classified as high-volatile organic compounds (V-VOCs), volatile organic compounds (VOCs), and semi-volatile organic compounds (S-VOCs). High-volatile organic compounds (V-VOCs) refer to compounds with low boiling points that can naturally evaporate and disappear, and have minimal impact on human health; semi-volatile organic compounds (S-VOCs) refer to compounds that can volatilize at 240°C or higher.

[0003] Currently, the main approach to improving the odor of polyurethane artificial leather is to select components with lower odor, such as plasticizers and water-based surface treatment agents. However, the polyurethane artificial leather prepared by this method still has a strong odor and cannot meet the needs of car manufacturers. Therefore, there is an urgent need to develop a new type of polyurethane artificial leather to further solve the odor problem of existing polyurethane artificial leather. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a low-odor polyurethane artificial leather and its preparation method, which significantly reduces the odor of polyurethane artificial leather, enabling it to meet the needs of car manufacturers.

[0005] The low-odor polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0006] The PU surface layer comprises the following raw materials in parts by weight: 100 parts of water-based PUD resin, 1-10 parts of crosslinking agent, 1-2 parts of dispersant, 5-10 parts of colorant, and 1-5 parts of adsorbent;

[0007] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A, 90 parts of polyurethane resin B, 30-50 parts of flame retardant, 1-5 parts of catalyst, and 1-5 parts of additives.

[0008] The adsorbent is composed of alumina, fumed silica and nanocellulose crystals.

[0009] Preferably, the alumina, fumed silica and nanocellulose crystals are compounded in a mass ratio of 1:0.5-2:0.5-2.

[0010] Preferably, the crosslinking agent is 774 crosslinking agent and the dispersant is 711 dispersant.

[0011] Preferably, the flame retardant is 7021 flame retardant, the catalyst is 7075 catalyst, and the additive is 7076 additive.

[0012] The preparation method of the above-mentioned low-odor polyurethane artificial leather proposed in this invention comprises the following steps:

[0013] S1: Mix water-based PUD resin, crosslinking agent, dispersant, colorant and adsorbent to form PU surface layer slurry;

[0014] S2: Apply the PU surface layer paste evenly to the release paper, and then dry it.

[0015] S3: Add flame retardant, catalyst, additive and polyurethane resin B to polyurethane resin A in sequence, stir and mix to form PU bottom layer slurry;

[0016] S4: Apply the PU base layer paste evenly to the side of the PU surface layer away from the release paper, and then dry it.

[0017] S5: Apply a base fabric to the side of the PU base layer away from the PU surface layer and continue the drying process;

[0018] S6: After drying, peel off the release paper from the product, and then treat the PU surface with a treatment agent to obtain low-odor polyurethane artificial leather.

[0019] Preferably, the drying temperature in S2 is 70-110℃, and the basis weight of the dried PU surface layer is 20-120 g / m². 2 .

[0020] Preferably, the drying temperature in S4 is 100-110℃, and the drying time is 5-15 minutes.

[0021] Preferably, the drying temperature in S5 is 130-150℃, and the drying time is 5-10 minutes.

[0022] Preferably, the method for treating the PU surface layer surface with the treatment agent in S6 is to treat the PU surface layer surface sequentially with U-9533M matte treatment agent and WB35 water-based treatment agent.

[0023] Beneficial technical effects of the present invention:

[0024] This invention significantly reduces the VOC content in polyurethane artificial leather by adding an adsorbent. The adsorbent of this invention is composed of alumina, fumed silica, and nano-cellulose crystals, which have a synergistic promoting effect on reducing the VOC content of polyurethane artificial leather. In addition, the adsorbent of this invention can also improve the flame retardant properties of polyurethane artificial leather to a certain extent. Detailed Implementation

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] Example 1

[0027] The low-odor polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0028] The PU surface layer contains the following raw materials in parts by weight: 100 parts water-based PUD resin, 5 parts 774 crosslinking agent, 1.5 parts 711 dispersant, 8 parts colorant, and 3 parts adsorbent;

[0029] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A (BDH027), 90 parts of polyurethane resin B (BDH028), 40 parts of 7021 flame retardant, 3 parts of 7075 catalyst, and 3 parts of 7076 additive.

[0030] The adsorbent is a compound of alumina, fumed silica and nanocellulose crystals in a mass ratio of 1:1:1.

[0031] The preparation method of the above-mentioned low-odor polyurethane artificial leather proposed in this invention comprises the following steps:

[0032] S1: Mix water-based PUD resin, crosslinking agent, dispersant, colorant and adsorbent to form PU surface layer slurry;

[0033] S2: The PU surface layer slurry is evenly coated onto the release paper, and then dried at 95℃. The basis weight of the dried PU surface layer is 80g / m². 2 ;

[0034] S3: Then, prepare the PU base layer. First, stir polyurethane resin A and flame retardant for 3 minutes, then add catalyst and stir for about 30 seconds, then add additive and stir for 30 seconds, and finally add polyurethane resin B and stir for 30 seconds to form the PU base layer slurry.

[0035] S4: Quickly and evenly apply the PU base layer paste to the side of the PU surface layer away from the release paper, and place it in a 105℃ oven for 10 minutes until semi-dry.

[0036] S5: Attach the base fabric to the side of the PU bottom layer away from the PU surface layer, and bake in an oven at 140℃ for 8 minutes;

[0037] S6: After drying, peel off the release paper from the product, and then treat the PU surface layer with U-9533M matte finish agent and WB35 water-based finish agent in sequence to obtain low-odor polyurethane artificial leather.

[0038] Example 2

[0039] The low-odor polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0040] The PU surface layer contains the following raw materials in parts by weight: 100 parts of water-based PUD resin, 5 parts of 774 crosslinking agent, 1.5 parts of 711 dispersant, 8 parts of colorant, and 2 parts of adsorbent;

[0041] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A (BDH027), 90 parts of polyurethane resin B (BDH028), 40 parts of 7021 flame retardant, 3 parts of 7075 catalyst, and 3 parts of 7076 additive.

[0042] The adsorbent is a compound of alumina, fumed silica and nanocellulose crystals in a mass ratio of 1:1:1.

[0043] The preparation method of the low-odor polyurethane artificial leather proposed in this invention is the same as in Example 1.

[0044] Example 3

[0045] The low-odor polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0046] The PU surface layer contains the following raw materials in parts by weight: 100 parts of water-based PUD resin, 5 parts of 774 crosslinking agent, 1.5 parts of 711 dispersant, 8 parts of colorant, and 4 parts of adsorbent;

[0047] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A (BDH027), 90 parts of polyurethane resin B (BDH028), 40 parts of 7021 flame retardant, 3 parts of 7075 catalyst, and 3 parts of 7076 additive.

[0048] The adsorbent is a compound of alumina, fumed silica and nanocellulose crystals in a mass ratio of 1:1:1.

[0049] The preparation method of the low-odor polyurethane artificial leather proposed in this invention is the same as in Example 1.

[0050] Comparative Example 1

[0051] The polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0052] The PU surface layer contains the following raw materials in parts by weight: 100 parts water-based PUD resin, 5 parts 774 crosslinking agent, 1.5 parts 711 dispersant, 8 parts colorant, and 3 parts alumina;

[0053] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A (BDH027), 90 parts of polyurethane resin B (BDH028), 40 parts of 7021 flame retardant, 3 parts of 7075 catalyst, and 3 parts of 7076 additive.

[0054] The preparation method of the polyurethane artificial leather proposed in this invention is the same as that in Example 1.

[0055] Comparative Example 2

[0056] The polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0057] The PU surface layer contains the following raw materials in parts by weight: 100 parts of water-based PUD resin, 5 parts of 774 crosslinking agent, 1.5 parts of 711 dispersant, 8 parts of colorant, and 3 parts of fumed silica.

[0058] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A (BDH027), 90 parts of polyurethane resin B (BDH028), 40 parts of 7021 flame retardant, 3 parts of 7075 catalyst, and 3 parts of 7076 additive.

[0059] The preparation method of the polyurethane artificial leather proposed in this invention is the same as that in Example 1.

[0060] Comparative Example 3

[0061] The polyurethane artificial leather proposed in this invention comprises a base fabric layer, a PU bottom layer, and a PU top layer arranged sequentially, wherein:

[0062] The PU surface layer contains the following raw materials in parts by weight: 100 parts of water-based PUD resin, 5 parts of 774 crosslinking agent, 1.5 parts of 711 dispersant, 8 parts of colorant, and 3 parts of nanocellulose crystals;

[0063] The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A (BDH027), 90 parts of polyurethane resin B (BDH028), 40 parts of 7021 flame retardant, 3 parts of 7075 catalyst, and 3 parts of 7076 additive.

[0064] The preparation method of the polyurethane artificial leather proposed in this invention is the same as that in Example 1.

[0065] Odor tests were conducted on the polyurethane artificial leather prepared in Examples 1-3 and Comparative Example 3. Prior to the odor test, the PU leather was baked in a 90°C oven for 18 hours to further accelerate curing and crosslinking. The testing method was based on the Tedlar Bag standard test method for volatile organic compounds in vehicle interior trim materials, and the results are shown in Table 1.

[0066] Table 1 Results of Volatile Organic Compound Content Detection

[0067]

[0068] As can be seen from the test results in Table 1, the content of volatile organic compounds in the low-odor polyurethane artificial leather of the present invention meets the requirements. As can be seen from the test results of Example 1 and Comparative Examples 1-3, the adsorbents alumina, fumed silica and nanocellulose crystals of the present invention have a synergistic promoting effect on reducing the VOC content of polyurethane artificial leather, thereby significantly reducing the odor of polyurethane artificial leather.

Claims

1. Low-odor polyurethane artificial leather, characterized in that, It includes a base fabric layer, a PU underlayer, and a PU top layer arranged sequentially, wherein: The PU surface layer comprises the following raw materials in parts by weight: 100 parts of water-based PUD resin, 1-10 parts of crosslinking agent, 1-2 parts of dispersant, 5-10 parts of colorant, and 1-5 parts of adsorbent; The PU base layer contains the following raw materials in parts by weight: 100 parts of polyurethane resin A, 90 parts of polyurethane resin B, 30-50 parts of flame retardant, 1-5 parts of catalyst, and 1-5 parts of additives. The adsorbent is composed of alumina, fumed silica and nanocellulose crystals.

2. The low-odor polyurethane artificial leather according to claim 1, characterized in that, The alumina, fumed silica and nanocellulose crystals are compounded in a mass ratio of 1:0.5-2:0.5-2.

3. The method for preparing low-odor polyurethane artificial leather as described in claim 1 or 2, characterized in that, The steps are as follows: S1: Mix water-based PUD resin, crosslinking agent, dispersant, colorant and adsorbent to form PU surface layer slurry; S2: Apply the PU surface layer paste evenly to the release paper, and then dry it. S3: Add flame retardant, catalyst, additive and polyurethane resin B to polyurethane resin A in sequence, stir and mix to form PU bottom layer slurry; S4: Apply the PU base layer paste evenly to the side of the PU surface layer away from the release paper, and then dry it. S5: Apply a base fabric to the side of the PU base layer away from the PU surface layer and continue the drying process; S6: After drying, peel off the release paper from the product, and then treat the PU surface with a treatment agent to obtain low-odor polyurethane artificial leather.

4. The method for preparing low-odor polyurethane artificial leather according to claim 3, characterized in that, The drying temperature in S2 is 70-110℃, and the weight of the dried PU surface layer is 20-120 g / m². 2 .

5. The method for preparing low-odor polyurethane artificial leather according to claim 3, characterized in that, The drying temperature in S4 is 100-110℃, and the time is 5-15 minutes.

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