A leather sofa and a method of making the same

Abstract

The present application relates to the technical field of sofa, in particular to a leather sofa and a manufacturing method thereof, comprising the following steps: after cutting the leather into pieces, a mixed color of finishing paint is manually applied on the leather pieces, and the leather pieces are dried for 10-14 hours to obtain the manually painted leather pieces; the obtained leather pieces are fixed, dried for 10-14 hours, sewn into a sofa cover, and then the sofa cover is touched to obtain a semi-finished sofa; the semi-finished sofa is refined, fixed again on the surface, dried for 22-26 hours to obtain the manually painted leather sofa. The manufacturing method can achieve an antique effect in terms of vision and touch, the crack treatment only cracks the film on the surface of the leather without damaging the leather itself, and the quality and service life of the leather can be ensured. The manufacturing method is simple to operate, easy to control, high in production efficiency and low in production cost, and can be used for mass production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sofa technology, in particular to a leather sofa and a manufacturing method thereof. BACKGROUND

[0002] With the improvement of people's living standards, leather products have entered thousands of households due to their excellent performance, including sofas, leather jackets, leather shoes, leather bags, etc. Among them, the leather used for sofas is made of animal skins such as pigskin, cowhide, sheepskin, etc. The leather is processed into a seat through a specific process. Since the leather is breathable, important is very soft, etc. Therefore, it is very comfortable to sit on the seat made of leather, and it is also not easy to get dirty.

[0003] With the development of the trend, the words "vintage" and "antique" appear in people's sight. Naturally, antique products have become part of the trend. Especially in the European and American markets, whether it is fashion or furniture, antique products are very popular.

[0004] The existing leather antique processing technology mainly includes two types:

[0005] 1. By silk printing, oil painting, embossing, etc. Form some antique patterns on the surface of the leather, hoping to make the leather look antique through these patterns. But this kind of antique is a method of treating the symptoms and not the disease. Only the pattern part of the leather has an antique style, while the other part is a modern style. The two parts are incompatible and conflict with each other. In some people's eyes, it may even make the product look like a mess. Because it does not make the product reach the true meaning of antique.

[0006] 2. By damaging the surface of the leather, the leather is damaged and reaches the effect of antique. This method has two shortcomings. First, damaging the surface of the leather will make the leather lose protection and shorten its life. This method cannot guarantee the quality of the product, and customers are also difficult to have confidence in the product. Second, this destruction method is too special. People feel that a new product has been deliberately damaged. "Antique" is a concept, an "old" concept, not "bad". Moreover, this method cannot reach the effect of antique in terms of color. SUMMARY

[0007] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide a leather sofa and a manufacturing method thereof, which can achieve an antique effect in terms of vision (color, crack) and touch (crack) by using the manufacturing method, the crack treatment is only the crack of the film on the surface of the leather, without damaging the leather itself, which can ensure the quality and service life of the leather; during the manufacturing, an operator takes a piece of cloth, soaks the prepared color repair paint on the cloth, and gently wipes the leather around, leaving the middle part of the leather white, after all the leather is sewn, the leather is put on the sofa to form an antique visual effect, the manufacturing method is simple to operate, convenient to control, high in production efficiency, low in production cost, and can be used for mass production.

[0008] The purpose of the present application is achieved by the following technical scheme: a manufacturing method of a leather sofa, comprising the following steps:

[0009] S1, taking leather, cutting the leather into leather pieces, manually wiping mixed color repair paint on the leather pieces, drying for 10-14 hours to obtain manually-wiped leather pieces, for standby use;

[0010] S2, fixing the color of the leather pieces obtained in step S1, drying for 10-14 hours, sewing the leather pieces into a sofa leather cover, and then performing leather touching to obtain a semi-finished sofa, for standby use;

[0011] S3, after the semi-finished sofa obtained in step S2 is finely processed, fixing the color on the surface again, drying for 22-26 hours to obtain a manually-wiped leather sofa.

[0012] By using the manufacturing method, the leather can achieve an antique effect in terms of vision (color, crack) and touch (crack), the crack treatment is only the crack of the film on the surface of the leather, without damaging the leather itself, which can ensure the quality and service life of the leather; during the manufacturing, an operator takes a piece of cloth, soaks the prepared color repair paint on the cloth, and gently wipes the leather around, leaving the middle part of the leather white, after all the leather is sewn, the leather is put on the sofa to form an antique visual effect; and at least one color of the color repair paint can be wiped on the surface of the leather during the manual wiping, so that the leather obtains multiple colors, and the leather sofa made thereby has better three-dimensional effect and more levels, the manufacturing method is simple to operate, convenient to control, high in production efficiency, low in production cost, and can be used for mass production.

[0013] Preferably, the color correction paint in step S1 is a mixture of component A, component B, component C and component D in a weight ratio of 1:0.8-1.2:0.8-1.2:3; wherein the component D is n-butyl acetate.

[0014] Preferably, the component A includes the following raw materials by weight: nitrocellulose 10-30 parts, alkyd resin 5-20 parts, castor oil 1-5 parts, butanol 1-3 parts and flatting powder 1-3 parts.

[0015] The color correction paint in the present application is formed by component A, component B, component C and component D in a weight ratio of 1:0.8-1.2:0.8-1.2:3, so that the color correction paint has moderate gloss, good flexibility and good scratch resistance, avoiding high gloss, low flexibility and fatigue, and avoiding low gloss and easy scratching. The addition of nitrocellulose in component A can fully release the solvent after coating, promote the drying of the color correction paint, and improve the flexibility of the color correction paint, so that the color correction paint maintains good flexibility with the leather after drying, and the addition of nitrocellulose further improves the brightness of the leather surface and the drying speed of the color correction paint and the hardness of the color correction paint coating, so that the leather can be polished and easily repaired; the addition of alkyd resin can make the color correction paint coating film bright and full, and can improve the care effect of the leather; compared with the unmodified alkyd resin, the alkyd resin modified by castor oil can improve the water resistance, weather resistance and moisture resistance of the leather when the color correction paint is coated on the surface of the leather, which is further beneficial to prolong the service life of the leather and improve the care effect of the leather; butanol as a volatile solvent can not only promote the dissolution of nitrocellulose, but also accelerate the curing of the color correction paint after coating and adhere to the surface of the leather, and the added flatting powder has a flatting effect.

[0016] Preferably, the component B includes the following raw materials by weight: nitrocellulose 5-10 parts, organic solvent 30-60 parts, xylene 3-7 parts, leveling agent 0.01-5 parts and flatting powder 1-3 parts.

[0017] Preferably, the organic solvent is a mixture of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene in a weight ratio of 0.5-1.5:0.8-1.2:0.5-3:2-4; and the leveling agent is acetone.

[0018] The organic solvent in the present application is composed of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene, which can not only promote the dissolution of nitrocellulose, but also accelerate the curing of the color correction paint after coating and adhere to the surface of the leather, and the added flatting powder has a flatting effect.

[0019] Preferably, the component C includes the following raw materials by weight: nitrocellulose 5-10 parts, diluent 30-60 parts, acetone 0-5 parts.

[0020] Preferably, the diluent is a mixture consisting of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate, toluene in a weight ratio of 0.5-1.5:0.8-1.2:0.5-3:0.5-1.5.

[0021] Preferably, the fixing color in step S2 and step S3 is performed by using a fixing paint, and the fixing paint comprises the following raw materials in parts by weight: nitrocellulose fiber 5-10 parts, curing agent 1-5 parts, solvent 30-60 parts, alkyd resin 5-10 parts, trimethoxysilyl propyl vinyl ether 5-10 parts, N-butyl-N-methyl pyrrolidine bis(trifluoromethanesulfonyl) imide salt 1-3 parts.

[0022] Preferably, the solvent is a mixture consisting of ethyl acetate, cyclohexanone, butyl acetate and ethylene glycol butyl ether in a weight ratio of 0.5-1.5:0.8-1.2:1-1.5:0.5-1.0.

[0023] Preferably, the curing agent is one or more of methyl triethoxysilane, ethyl triethoxysilane, vinyl triacetoxysilane, methyl tributylketoximosilane, tetraethoxysilane.

[0024] The fixing paint in the present application is prepared by using the above-mentioned raw materials, and the fixing paint prepared by using the above-mentioned raw materials has moderate gloss, good flexibility, good scratch resistance, and plays a good fixing protection role on the color repair paint. The dried fixing paint avoids the problems of too high gloss, low flexibility and fatigue, and avoids the problem of too low gloss and easy scratching. The trimethoxysilyl propyl vinyl ether and N-butyl-N-methyl pyrrolidine bis(trifluoromethanesulfonyl) imide salt used in the present application solve the problems of poor adhesion and easy hydrolysis of the fixing paint, increase the wettability and emulsifiability, and improve the brightness of the leather. The addition of the alkyd resin can make the color repair paint coating film bright and full, and can improve the care effect of the leather.

[0025] A real leather sofa is prepared by using the above-mentioned preparation method.

[0026] The present application has the advantages that: the preparation method of the real leather sofa can make the prepared leather achieve an antique effect in terms of vision (color, crack) and touch (crack), and the crack treatment only cracks the film on the surface of the leather without damaging the leather itself, so that the quality and service life of the leather are ensured; during the preparation, an operator takes a piece of cloth, immerses the prepared color repair paint in the cloth, and gently wipes the leather around the white space in the middle of the leather, and after all the leather is sewn, the leather is put on the sofa to form an antique visual effect. The preparation method is simple to operate, easy to control, high in production efficiency, and low in production cost, and can be used for large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of a leather surface for a leather sofa in the present application. DETAILED DESCRIPTION

[0028] For the convenience of those skilled in the art, the present application will be further described below in conjunction with examples and drawings, and the content mentioned in the embodiments is not a limitation on the present application.

[0029] Example 1

[0030] A method for making a leather sofa, comprising the following steps:

[0031] S1, taking leather, cutting the leather into leather pieces, and then manually rubbing mixed color finishing paint on the leather pieces, drying for 12h to obtain hand-rubbed leather pieces for standby;

[0032] S2, fixing the color of the several leather pieces obtained in step S1, drying for 12h, sewing the leather pieces into a sofa cover, and then rubbing the leather to obtain a semi-finished sofa for standby;

[0033] S3, after finishing the semi-finished sofa obtained in step S2, fixing the color on the surface again, drying for 24h to obtain a hand-rubbed leather sofa.

[0034] In step S1, the finishing paint is a mixture of components A, B, C and D in a weight ratio of 1:1:1:3; wherein the component D is n-butyl acetate.

[0035] The component A includes the following raw materials by weight: nitrocellulose 20 parts, alkyd resin 15 parts, castor oil 3 parts, butanol 2 parts and matting powder 2 parts, the matting powder is talc, and the alkyd resin is AK933 castor oil modified alkyd resin provided by Heshan City Handeli Chemical Co., Ltd.

[0036] The component B includes the following raw materials by weight: nitrocellulose 8 parts, organic solvent 45 parts, dimethylbenzene 5 parts, leveling agent 3 parts and matting powder 2 parts.

[0037] The organic solvent is a mixture of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene in a weight ratio of 1.0:1.0:2:3; the leveling agent is acetone, and the matting powder is talc.

[0038] The component C includes the following raw materials by weight: nitrocellulose 8 parts, diluent 45 parts, acetone 3 parts.

[0039] The diluent is a mixture of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene in a weight ratio of 1.0:1.0:2:1.0.

[0040] In step S2 and step S3, the fixing color is fixed by using a fixing paint, and the fixing paint comprises the following raw materials by weight: 8 parts of nitrocellulose fiber, 3 parts of curing agent, 45 parts of solvent, 8 parts of alkyd resin, 8 parts of trimethoxysilyl propyl vinyl ether, 2 parts of N-butyl-N-methyl pyrrolidine bis(trifluoromethane sulfonate) imide salt, and the alkyd resin is AK933 castor oil modified alkyd resin provided by Heshan City Hande Chemical Co., Ltd.

[0041] In step S2 and step S3, the fixing color is fixed by using a fixing paint, and the fixing paint comprises the following raw materials by weight: 8 parts of nitrocellulose fiber, 3 parts of curing agent, 45 parts of solvent, 8 parts of alkyd resin, 8 parts of trimethoxysilyl propyl vinyl ether, 2 parts of N-butyl-N-methyl pyrrolidine bis(trifluoromethane sulfonate) imide salt, and the alkyd resin is AK933 castor oil modified alkyd resin provided by Heshan City Hande Chemical Co., Ltd.

[0042] In step S2 and step S3, the fixing color is fixed by using a fixing paint, and the fixing paint comprises the following raw materials by weight: 8 parts of nitrocellulose fiber, 3 parts of curing agent, 45 parts of solvent, 8 parts of alkyd resin, 8 parts of trimethoxysilyl propyl vinyl ether, 2 parts of N-butyl-N-methyl pyrrolidine bis(trifluoromethane sulfonate) imide salt, and the alkyd resin is AK933 castor oil modified alkyd resin provided by Heshan City Hande Chemical Co., Ltd.

[0043] A leather sofa is prepared by the above method.

[0044] Example 2

[0045] A method for making a leather sofa, comprising the following steps:

[0046] S1, take the leather, cut the leather into leather pieces, and then manually apply a mixed color finishing paint on the leather pieces, dry for 10h to obtain the manually colored leather pieces, and reserve them for use;

[0047] S2, fix the color of the several leather pieces obtained in step S1, dry for 10h, sew the leather pieces into a sofa cover, and then perform a touch-up to obtain a semi-finished sofa, and reserve it for use;

[0048] S3, after the semi-finished sofa obtained in step S2 is finished, fix the color on the surface again, dry for 22h to obtain a manually colored leather sofa.

[0049] In step S1, the finishing paint is a mixture of component A, component B, component C and component D in a weight ratio of 1:0.8:0.8:3; wherein the component D is n-butyl acetate.

[0050] The component A comprises the following raw materials by weight: 10 parts of nitrocellulose, 5 parts of alkyd resin, 1 part of castor oil, 1 part of butanol and 1 part of flatting powder, the flatting powder is talc, and the alkyd resin is AK933 castor oil modified alkyd resin provided by Heshan City Hande Chemical Co., Ltd.

[0051] The component B comprises the following raw materials by weight: 5 parts of nitrocellulose fiber, 30 parts of organic solvent, 3 parts of dimethylbenzene, 0.01 parts of leveling agent and 1 parts of flatting powder.

[0052] The organic solvent is a mixture composed of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene according to a weight ratio of 0.5:0.8:0.5:2; the leveling agent is acetone, and the flatting powder is talc.

[0053] The component C includes the following raw materials by weight: nitrocellulose 5 parts, diluent 30 parts.

[0054] The diluent is a mixture composed of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene according to a weight ratio of 0.5:0.8:0.5:0.5.

[0055] In the fixing in steps S2 and S3, a fixing paint is used for fixing, and the fixing paint includes the following raw materials by weight: nitrocellulose 5 parts, curing agent 1 part, solvent 30 parts, alkyd resin 5 parts, trimethoxysilyl propyl vinyl ether 5 parts, N-butyl-N-methyl pyrrolidine bis(trifluoromethane sulfonate) imidate salt 1 part, and the alkyd resin is AK933 castor oil modified alkyd resin provided by Heshan City Handeli Chemical Co., Ltd.

[0056] The solvent is a mixture composed of ethyl acetate, cyclohexanone, butyl acetate and ethylene glycol butyl ether according to a weight ratio of 0.5:0.8:1:0.5.

[0057] The curing agent is methyl triethoxysilane.

[0058] A leather sofa is prepared by the above preparation method.

[0059] Example 3

[0060] A preparation method of a leather sofa, comprising the following steps:

[0061] S1, taking leather, cutting the leather into leather pieces, and then manually rubbing mixed color finishing paint on the leather pieces, drying for 14 hours to obtain manually rubbed leather pieces, for standby;

[0062] S2, fixing the leather pieces obtained in step S1, drying for 14 hours, sewing the leather pieces into a sofa cover, and then tanning the sofa cover to obtain a semi-finished sofa, for standby;

[0063] S3, finishing the semi-finished sofa obtained in step S2, and then fixing the surface again, drying for 26 hours to obtain a manually rubbed leather sofa.

[0064] The finishing paint in step S1 is a mixture of component A, component B, component C and component D according to a weight ratio of 1:1.2:1.2:3; and the component D is n-butyl acetate.

[0065] The component A includes the following raw materials by weight: nitrocellulose 30 parts, alkyd resin 20 parts, castor oil 5 parts, butanol 3 parts and matting powder 3 parts, the matting powder is talc, the alkyd resin uses AK933 castor oil modified alkyd resin provided by Heshan City and Li Chemical Co., Ltd.

[0066] The component B includes the following raw materials by weight: nitrocellulose 10 parts, organic solvent 60 parts, xylene 7 parts, leveling agent 5 parts and matting powder 3 parts.

[0067] The organic solvent is a mixture composed of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene according to the weight ratio of 1.5:1.2:3:4; the leveling agent is acetone, and the matting powder is talc.

[0068] The component C includes the following raw materials by weight: nitrocellulose 10 parts, diluent 60 parts, acetone 5 parts.

[0069] The diluent is a mixture composed of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene according to the weight ratio of 1.5:1.2:3:1.5.

[0070] The fixing is performed by using a fixing paint in steps S2 and S3, and the fixing paint includes the following raw materials by weight: nitrocellulose fiber 10 parts, curing agent 5 parts, solvent 60 parts, alkyd resin 10 parts, trimethoxysilyl propyl vinyl ether 10 parts, N-butyl-N-methyl pyrrolidine bis(trifluoromethane sulfonate) imidate salt 3 parts, and the alkyd resin uses AK933 castor oil modified alkyd resin provided by Heshan City and Li Chemical Co., Ltd.

[0071] The solvent is a mixture composed of ethyl acetate, cyclohexanone, butyl acetate and ethylene glycol butyl ether according to the weight ratio of 1.5:1.2:1.5:1.0.

[0072] The curing agent is methyl tributyl ketone oxime silane.

[0073] A leather sofa is prepared by using the above preparation method.

[0074] Comparative Example 1

[0075] The difference between the present comparative example and the above example 1 is that the raw materials of the fixing paint in the present comparative example do not add trimethoxysilyl propyl vinyl ether and N-butyl-N-methyl pyrrolidine bis(trifluoromethane sulfonate) imidate salt. The rest of the present comparative example is the same as example 1, which will not be repeated here.

[0076] Comparative Example 2

[0077] The difference between the present comparative example and the above-mentioned example 1 is that a single curing agent is used in the raw material of the color fixing paint in the present comparative example. The rest of the present comparative example is the same as example 1, which will not be repeated here.

[0078] The performance test is carried out on the leather made from the leather of example 1 and comparative examples 1-2, and the results are shown in table 1.

[0079] Color fastness test: according to the provisions of GB / T 3920-2008, dry rubbing and wet rubbing are used for test respectively, and then the staining grade of rubbing cloth is evaluated according to the provisions of GBT 6151-2016;

[0080] Softness test: according to the provisions of QB / T 4870-2015, a test ring with an inner diameter of 25mm is selected to test its softness value.

[0081] Project Dry rubbing colour fastness / grade Wet rubbing colour fastness / grade Softness value Example 1 6.5 6.7 54 Comparative Example 1 4.2 4.0 47 Comparative Example 2 6.2 6.3 52

[0082] From the above table 1, it can be seen that the color fastness of the leather of the sofa of the present application is high, and the softness is better, which shows that the color fixing paint and the color fixing paint used in the present application have good adhesion to the leather, good wear resistance, and good flexibility; compared with comparative example 1, the softness value of example 1 is higher, which shows that the color fixing paint has a great influence on the color fixing, and the color fixing paint plays a good color fixing protection role, so as to improve the wear resistance, color fastness and softness of the leather sofa.

[0083] The above examples are the preferred implementation scheme of the present application, in addition to this, the present application can also be realized in other ways, without departing from the concept of the present application, any obvious replacement is within the protection scope of the present application.

Claims

1. A method of making a derma sofa, characterized by: It comprises the following steps: S1, taking leather, cutting the leather into leather pieces, and then manually rubbing mixed color finishing paint on the leather pieces, drying for 10-14 hours to obtain manually rubbed leather pieces for standby; S2, fixing the several leather pieces obtained in step S1, drying for 10-14 hours, sewing the leather pieces into a sofa cover, and then tanning to obtain a semi-finished sofa for standby; S3, after finishing the semi-finished sofa obtained in step S2, fixing the surface again, drying for 22-26 hours to obtain a manually rubbed leather sofa; The finishing paint in step S1 is a mixture of components A, B, C and D in a weight ratio of 1:0.8-1.2:0.8-1.2:3; wherein the component D is n-butyl acetate; The component A comprises the following raw materials by weight: nitrocellulose 10-30 parts, alkyd resin 5-20 parts, castor oil 1-5 parts, butanol 1-3 parts and flatting powder 1-3 parts; The component B comprises the following raw materials by weight: nitrocellulose 5-10 parts, organic solvent 30-60 parts, xylene 3-7 parts, leveling agent 0.01-5 parts and flatting powder 1-3 parts; The organic solvent in the finishing paint is a mixture of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene in a weight ratio of 0.5-1.5:0.8-1.2:0.5-3:2-4; the leveling agent is acetone; The component C comprises the following raw materials by weight: nitrocellulose 5-10 parts, diluent 30-60 parts, acetone 0-5 parts; The diluent is a mixture of ethylene glycol butyl ether, methyl isobutyl ketone, n-butyl acetate and toluene in a weight ratio of 0.5-1.5:0.8-1.2:0.5-3:0.5-1.5; In steps S2 and S3, the fixing is performed using a fixing paint, and the fixing paint comprises the following raw materials by weight: nitrocellulose fiber 5-10 parts, curing agent 1-5 parts, solvent 30-60 parts, alkyd resin 5-10 parts, trimethoxysilyl propyl vinyl ether 5-10 parts, N-butyl-N-methyl pyrrolidine bis(trifluoromethanesulfonyl) imidazolium salt 1-3 parts; The solvent in the fixing paint is a mixture of ethyl acetate, cyclohexanone, butyl acetate and ethylene glycol butyl ether in a weight ratio of 0.5-1.5:0.8-1.2:1-1.5:0.5-1.0; the curing agent is one or more of methyl triethoxysilane, ethyl triethoxysilane, vinyl triacetoxy silane, methyl tributyl ketoxime silane and tetraethoxysilane.

2. A leather sofa, characterized by: The leather sofa is made by the manufacturing method of claim 1.

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