Leather material with high light reflectance and method for manufacturing the same

Abstract

The present application relates to the leather technical field, especially in the IPC D06N3 field, more particularly, a kind of leather material with high light reflectivity and preparation method thereof.The leather material includes leather layer (1), primer layer (2), mixed layer (3), topcoat (4) from bottom to top.The weight ratio of the red, yellow, blue three kinds of pigment paste is (4-7) :(2-4) :(1-3), can increase the reflectivity of dermis surface sunlight, reduce dermis surface temperature, compared with traditional inorganic carbon black pigment, reflectivity can increase 58%, surface temperature reduces 20%;The resin emulsion includes polyurethane emulsion, acrylate emulsion, the weight ratio of polyurethane emulsion, acrylate emulsion is 1 :(0.6-1.1), can improve the wetting performance between pigment, further reduce dermis surface temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of leather technology, especially to the field of IPC D06N3, and more particularly to a leather material with high light reflectance and a preparation method thereof. BACKGROUND

[0002] At present, most of the seats configured in medium and high-grade cars on the market are represented by leather seats. In order to improve the blackness, inorganic carbon black is generally added, which has good hiding power, but has the great defect of strong heat absorption, especially under long-time light irradiation, the black product absorbs heat very quickly. At the same time, too much carbon black makes it difficult to disperse, poor in transmittance, and large in oil absorption value. The surface temperature of the seat and cushion of the car will quickly rise with the light intensity under outdoor high-temperature sunlight, thereby bringing many inconveniences to consumers.

[0003] CN 109610187 A discloses a leather heat-reflecting colorant, comprising heat-absorbing organic carbon black, a carrier and a functional additive. The heat-absorbing organic carbon black is carbon black with an organic group, the organic group contains at least one substituted C-C single bond or C=C double bond, the two carbon atoms of the C-C single bond or C=C double bond are combined with the carbon black through respective single bonds or double bonds, and at least one carbon atom in the C-C single bond or C=C double bond has more than one active substituent group. The leather heat-reflecting colorant of the application has the effect of cooling and cooling, and can solve the problem of rapid surface temperature rise of real leather under high-temperature sunlight. However, in order to solve the problem of reduced film softness caused by the addition of organic carbon black, a large amount of plasticizer is used. Since the high-temperature plasticizer is prone to precipitation, not only does it cause deformation of the leather, but it also produces a lot of odor. SUMMARY

[0004] The first aspect of the present application provides a leather material with high light reflectance, which comprises a leather layer, a bottom coating layer, a mixed layer and a top coating layer from bottom to top.

[0005] The thickness ratio of the bottom coating layer, the mixed layer and the top coating layer is (4-6):(1-3):1.

[0006] Preferably, the thickness ratio of the bottom coating layer, the mixed layer and the top coating layer is 5:2:1.

[0007] The preparation raw materials of the bottom coating layer include, by weight: 100-150 parts of pigment paste, 600-800 parts of resin emulsion and 100-200 parts of water.

[0008] Preferably, the preparation raw materials of the bottom coating layer include, by weight: 120-130 parts of pigment paste, 720-740 parts of resin emulsion and 140-150 parts of water.

[0009] Preferably, the preparation of the base coat includes the following steps: mixing the pigment paste, resin emulsion, water, dispersing for 10-30 min at 200-600 rpm.

[0010] The preparation raw materials of the mixed layer include, by weight: pigment paste 100-150 parts, resin emulsion 600-750 parts, water 50-100 parts, crosslinking agent 60-120 parts, and auxiliary agent 30-60 parts.

[0011] Preferably, the preparation raw materials of the mixed layer include, by weight: pigment paste 120-130 parts, resin emulsion 650-690 parts, water 70-80 parts, crosslinking agent 80-90 parts, and auxiliary agent 40-50 parts.

[0012] Preferably, the preparation of the mixed layer includes the following steps: mixing the pigment paste, resin emulsion, water, crosslinking agent, and auxiliary agent, and dispersing for 10-30 min at 200-600 rpm.

[0013] The preparation raw materials of the top coat include, by weight: pigment paste 10-25 parts, resin emulsion 550-700 parts, water 150-250 parts, crosslinking agent 60-120 parts, and auxiliary agent 50-100 parts.

[0014] Preferably, the preparation raw materials of the top coat include, by weight: pigment paste 15-20 parts, resin emulsion 610-645 parts, water 190-200 parts, crosslinking agent 80-90 parts, and auxiliary agent 70-80 parts.

[0015] Preferably, the preparation of the top coat includes the following steps: mixing the pigment paste, resin emulsion, water, crosslinking agent, and auxiliary agent, and dispersing for 10-30 min at 200-600 rpm.

[0016] The auxiliary agent includes silicone emulsion, the solid content of the silicone emulsion is 40-55 wt%, and the viscosity (25°C, Brookfield viscosity, GB / T11145) is 100-800 mPa•s.

[0017] Preferably, the solid content of the silicone emulsion is 50 wt%, brand: Wacker, model E65.

[0018] The resin emulsion includes at least one of polyester emulsion, polyurethane emulsion, and acrylate emulsion.

[0019] Preferably, the resin emulsion includes polyurethane emulsion and acrylate emulsion, and the weight ratio of the polyurethane emulsion to the acrylate emulsion is 1: (0.6-1.1).

[0020] Further preferably, the resin emulsion includes polyurethane emulsion and acrylate emulsion, and the weight ratio of the polyurethane emulsion to the acrylate emulsion is 1:0.85.

[0021] Preferably, the polyurethane emulsion has a solid content of 35-45 wt% and a pH value of 7-10.

[0022] Further preferably, the polyurethane emulsion has a solid content of 40 wt% and a pH value of 7-9, and is available from Anhui Andahuatai New Material Co., Ltd. with model number AH-1720A.

[0023] Preferably, the acrylate emulsion is available from Shanghai Can Sen Chemical Co., Ltd. with model number CS-2184W.

[0024] The pigment paste includes red, yellow and blue colors.

[0025] The pigment paste is an organic pigment.

[0026] Preferably, the pigment paste has a solid content of 15-25 wt% and a pH value of 9-10.

[0027] Preferably, the red pigment paste has a solid content of 17 wt% and a pH value of 9.3; the yellow pigment paste has a solid content of 17 wt% and a pH value of 9.8; and the blue pigment paste has a solid content of 20 wt% and a pH value of 9.8, all of which are available from Star Fine Coatings (Suzhou) Co., Ltd.

[0028] The applicant has found that the weight ratio of the red, yellow and blue pigment pastes is (4-7):(2-4):(1-3), which can increase the reflectivity of sunlight on the dermis surface and reduce the temperature of the dermis surface. Traditional inorganic carbon black is usually added to the surface coating of leather as a black pigment due to its excellent dispersion performance and high adaptability to leather. However, due to its own physical properties, the reflectivity of spectral energy is low, which results in large heat absorption, especially in summer when the sunlight is directly incident, the temperature of the leather surface rises greatly, which affects the body feeling. In the present application, the specific proportion of red, yellow and blue organic pigment pastes is used to form the same apparent black as carbon black, but the reflectivity of sunlight on the dermis surface is greatly increased. However, due to the differences in the properties of the three organic pigments, agglomeration is easy to occur, which affects the uniformity of black. Further research has found that the resin emulsion includes polyurethane emulsion and acrylate emulsion, and the weight ratio of polyurethane emulsion to acrylate emulsion is 1:(0.6-1.1), which can improve the wetting performance between pigments and effectively reduce the risk of pigment paste agglomeration, further reducing the temperature of the dermis surface.

[0029] Preferably, the weight ratio of the red, yellow and blue pigment pastes is (4-7):(2-4):(1-3).

[0030] Further preferably, the weight ratio of the red, yellow and blue pigment pastes is 7:2:1.

[0031] The second aspect of the present application provides a method for preparing a high light reflectivity leather material, comprising the following steps:

[0032] Step 1: pretreating the cowhide to form a leather layer;

[0033] Step 2: applying a primer layer on the upper part of the leather layer and drying;

[0034] Step 3: applying a mixed layer on the upper part of the primer layer and drying;

[0035] Step 4: applying a topcoat layer on the upper part of the mixed layer and drying, thereby obtaining the high light reflectivity leather material.

[0036] The dry film thickness of the primer layer is 15-30 μm.

[0037] Preferably, the dry film thickness of the primer layer is 25 μm.

[0038] Beneficial effects

[0039] The weight ratio of the red, yellow and blue pigments is (4-7):(2-4):(1-3), which can increase the reflectivity of sunlight on the surface of the corium and reduce the temperature of the surface of the corium. Compared with the traditional inorganic carbon black pigment, the reflectivity can be increased by 58% and the surface temperature can be reduced by 20%. The thickness ratio of the primer layer, the mixed layer and the topcoat layer is (4-6):(1-3):1, which can improve the mechanical properties of the leather. The resin emulsion comprises polyurethane emulsion and acrylate emulsion, and the weight ratio of the polyurethane emulsion to the acrylate emulsion is 1:(0.6-1.1), which can improve the wetting properties between the pigments and further reduce the temperature of the surface of the corium. The auxiliary agent comprises silicone emulsion, the solid content of the silicone emulsion is 40-55 wt%, and the viscosity is 100-800 mPa•s, which can improve the dispersion properties of the pigments and the resin. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a structural diagram of the leather material of Example 1, wherein 1 is the leather layer, 2 is the primer layer, 3 is the mixed layer, and 4 is the topcoat layer.

[0041] Figure 2 It is a test instrument for the radiation reflectivity of Example 1.

[0042] Figure 3 It is a test instrument for the surface temperature of the leather of Example 1. DETAILED DESCRIPTION

[0043] Example 1

[0044] A high light reflectivity leather material, such as Figure 1As shown, the leather material is from bottom to top leather layer 1, primer layer 2, mixed layer 3, top coating layer 4.

[0045] The thickness ratio of the primer layer 2, the mixed layer 3, and the top coating layer 4 is 5:2:1.

[0046] The preparation raw materials of the primer layer 2 are as follows: 120 parts of pigment paste, 720 parts of resin emulsion, and 140 parts of water.

[0047] The preparation of the primer layer 2 is as follows: mix the pigment paste, the resin emulsion, and the water, and disperse at 200 rpm for 15 min.

[0048] The preparation raw materials of the mixed layer 3 are as follows: 120 parts of pigment paste, 670 parts of resin emulsion, 80 parts of water, 80 parts of crosslinking agent, and 50 parts of auxiliary agent.

[0049] The preparation of the mixed layer 3 is as follows: mix the pigment paste, the resin emulsion, the water, the crosslinking agent, and the auxiliary agent, and disperse at 200 rpm for 20 min.

[0050] The preparation raw materials of the top coating layer 4 are as follows: 15 parts of pigment paste, 625 parts of resin emulsion, 200 parts of water, 85 parts of crosslinking agent, and 80 parts of auxiliary agent.

[0051] The preparation of the top coating layer 4 is as follows: mix the pigment paste, the resin emulsion, the water, the crosslinking agent, and the auxiliary agent, and disperse at 200 rpm for 20 min.

[0052] The resin emulsion is polyurethane emulsion and acrylate emulsion, and the weight ratio of the polyurethane emulsion to the acrylate emulsion is 1:0.85.

[0053] The solid content of the silicone emulsion is 50 wt%, and the brand is Wacker and the model is E65.

[0054] The polyurethane emulsion has a solid content of 40 wt% and a pH value of 7-9, is purchased from Anhui Andahua Tai New Material Co., Ltd., and has a model of AH-1720A.

[0055] The acrylate emulsion is purchased from Shanghai Sansen Chemical Co., Ltd. and has a model of CS-2184W.

[0056] The pigment paste is red, yellow, and blue.

[0057] The solid content of the pigment paste red is 17 wt% and the pH value is 9.3; the solid content of the pigment paste yellow is 17 wt% and the pH value is 9.8; and the solid content of the pigment paste blue is 20 wt% and the pH value is 9.8, all of which are purchased from Star Fine Coatings (Suzhou) Co., Ltd.

[0058] The weight ratio of the red, yellow, and blue pigment pastes is 5:3:2.

[0059] Preferably, the dry adhesive thickness of the base coating 2 is 25 μm.

[0060] A method for preparing a leather material with high light reflectivity includes the following steps:

[0061] Step 1: Pre-treat the cowhide to form leather layer 1;

[0062] Step 2: Apply base coating 2 to the upper part of leather layer 1 and dry at 80°C for 30 minutes;

[0063] Step 3: Apply the mixing layer 3 onto the top of the base layer 2 and dry at 80°C for 40 minutes;

[0064] Step 4: Apply top coating 4 to the upper part of the mixing layer 3 and dry at 80°C for 40 minutes to obtain the final product.

[0065] Example 2

[0066] The specific implementation method is the same as in Example 1; the difference is that in Example 2, the weight ratio of the red, yellow and blue pigment pastes is 4.2:3.1:1.8.

[0067] Comparative Example 1

[0068] The specific implementation method is the same as in Example 1; the difference is that in Comparative Example 1, the pigment paste is carbon black with a solid content of about 20% and a pH value of 9.8, purchased from Starr Fine Coatings (Suzhou) Co., Ltd., model PP-11.

[0069] Comparative Example 2

[0070] The specific implementation method is the same as in Example 1; the difference is that in Comparative Example 2, the resin emulsion is a polyurethane emulsion with a solid content of 40wt% and a pH value of 7-9. It was purchased from Anhui Anda Huatai New Materials Co., Ltd., model: AH-1720A.

[0071] Performance test method

[0072] The leather materials prepared in the examples and comparative examples were subjected to performance tests, and the test data are listed in Table 1.

[0073] 1. Radiation reflectance: The reflectance in the infrared region when the light wavelength range is 980nm. The testing instrument is as follows: Figure 2 As shown.

[0074] 2. Leather surface temperature: Heating temperature during air radiation process is 80℃, heating time is 20 minutes, and the testing instrument is as follows: Figure 3 As shown.

[0075] Performance test data

[0076] Table 1

[0077]

Claims

1. A leather material having high light reflectance, characterized by, The leather material comprises, from bottom to top, a leather layer (1), a primer layer (2), a mixed layer (3), and a top coating layer (4); The primer layer (2), the mixed layer (3), and the top coating layer (4) have a thickness ratio of 5:2:1; The preparation raw materials of the primer layer (2) include, by weight, 120 parts of pigment paste, 720 parts of resin emulsion, and 140 parts of water; The preparation raw materials of the mixed layer (3) include, by weight, 120 parts of pigment paste, 670 parts of resin emulsion, 80 parts of water, 80 parts of crosslinking agent, and 50 parts of additive; The preparation raw materials of the top coating layer (4) include, by weight, 15 parts of pigment paste, 625 parts of resin emulsion, 200 parts of water, 85 parts of crosslinking agent, and 80 parts of additive; The resin emulsion in the primer layer (2), the mixed layer (3), and the top coating layer (4) is polyurethane emulsion and acrylate emulsion, and the weight ratio of the polyurethane emulsion to the acrylate emulsion is 1:0.85; The pigment paste in the primer layer (2), the mixed layer (3), and the top coating layer (4) is composed of red pigment paste, yellow pigment paste, and blue pigment paste; The solid content of the red pigment paste is 17wt%, and the pH value is 9.3; the solid content of the yellow pigment paste is 17wt%, and the pH value is 9.8; and the solid content of the blue pigment paste is 20wt%, and the pH value is 9.8; The weight ratio of the red pigment paste, the yellow pigment paste, and the blue pigment paste is 5:3:2; The additive in the primer layer (2), the mixed layer (3), and the top coating layer (4) includes silicone emulsion, and the solid content of the silicone emulsion is 50wt%; The method for preparing the leather material with high light reflectivity comprises the following steps: Step 1: pretreating cowhide to form a leather layer (1); Step 2: coating a primer layer (2) on the upper part of the leather layer (1), and drying at 80℃ for 30 min; Step 3: coating a mixed layer (3) on the upper part of the primer layer (2), and drying at 80℃ for 40 min; Step 4: coating a top coating layer (4) on the upper part of the mixed layer (3), and drying at 80℃ for 40 min, thereby obtaining the leather material; The dry glue thickness of the primer layer (2) is 25μm.

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